Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

11 files changed, 5269 insertions, 0 deletions

diff --git a/include/net/sctp/auth.h b/include/net/sctp/auth.h
new file mode 100644
index 00000000..49bc9577
--- /dev/null
+++ b/include/net/sctp/auth.h
@@ -0,0 +1,127 @@
+/* SCTP kernel implementation
+ * (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *   Vlad Yasevich     <vladislav.yasevich@hp.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#ifndef __sctp_auth_h__
+#define __sctp_auth_h__
+
+#include <linux/list.h>
+#include <linux/crypto.h>
+
+struct sctp_endpoint;
+struct sctp_association;
+struct sctp_authkey;
+struct sctp_hmacalgo;
+
+/*
+ * Define a generic struct that will hold all the info
+ * necessary for an HMAC transform
+ */
+struct sctp_hmac {
+	__u16 hmac_id;		/* one of the above ids */
+	char *hmac_name;	/* name for loading */
+	__u16 hmac_len;		/* length of the signature */
+};
+
+/* This is generic structure that containst authentication bytes used
+ * as keying material.  It's a what is referred to as byte-vector all
+ * over SCTP-AUTH
+ */
+struct sctp_auth_bytes {
+	atomic_t refcnt;
+	__u32 len;
+	__u8  data[];
+};
+
+/* Definition for a shared key, weather endpoint or association */
+struct sctp_shared_key {
+	struct list_head key_list;
+	__u16 key_id;
+	struct sctp_auth_bytes *key;
+};
+
+#define key_for_each(__key, __list_head) \
+	list_for_each_entry(__key, __list_head, key_list)
+
+#define key_for_each_safe(__key, __tmp, __list_head) \
+	list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
+
+static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
+{
+	if (!key)
+		return;
+
+	atomic_inc(&key->refcnt);
+}
+
+void sctp_auth_key_put(struct sctp_auth_bytes *key);
+struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
+void sctp_auth_destroy_keys(struct list_head *keys);
+int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
+struct sctp_shared_key *sctp_auth_get_shkey(
+				const struct sctp_association *asoc,
+				__u16 key_id);
+int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
+				struct sctp_association *asoc,
+				gfp_t gfp);
+int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
+void sctp_auth_destroy_hmacs(struct crypto_hash *auth_hmacs[]);
+struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
+struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
+void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
+				     struct sctp_hmac_algo_param *hmacs);
+int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
+				    __be16 hmac_id);
+int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
+int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
+void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
+			    struct sk_buff *skb,
+			    struct sctp_auth_chunk *auth, gfp_t gfp);
+
+/* API Helpers */
+int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
+int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
+			    struct sctp_hmacalgo *hmacs);
+int sctp_auth_set_key(struct sctp_endpoint *ep,
+		      struct sctp_association *asoc,
+		      struct sctp_authkey *auth_key);
+int sctp_auth_set_active_key(struct sctp_endpoint *ep,
+		      struct sctp_association *asoc,
+		      __u16 key_id);
+int sctp_auth_del_key_id(struct sctp_endpoint *ep,
+		      struct sctp_association *asoc,
+		      __u16 key_id);
+
+#endif
diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
new file mode 100644
index 00000000..befc8d2a
--- /dev/null
+++ b/include/net/sctp/checksum.h
@@ -0,0 +1,83 @@
+/* SCTP kernel reference Implementation
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001-2003 International Business Machines, Corp.
+ *
+ * This file is part of the SCTP kernel reference Implementation
+ *
+ * SCTP Checksum functions
+ *
+ * The SCTP reference implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * The SCTP reference implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *    Dinakaran Joseph
+ *    Jon Grimm <jgrimm@us.ibm.com>
+ *    Sridhar Samudrala <sri@us.ibm.com>
+ *
+ * Rewritten to use libcrc32c by:
+ *    Vlad Yasevich <vladislav.yasevich@hp.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#include <linux/types.h>
+#include <net/sctp/sctp.h>
+#include <linux/crc32c.h>
+
+static inline __u32 sctp_crc32c(__u32 crc, u8 *buffer, u16 length)
+{
+	return crc32c(crc, buffer, length);
+}
+
+static inline __u32 sctp_start_cksum(__u8 *buffer, __u16 length)
+{
+	__u32 crc = ~(__u32)0;
+	__u8  zero[sizeof(__u32)] = {0};
+
+	/* Optimize this routine to be SCTP specific, knowing how
+	 * to skip the checksum field of the SCTP header.
+	 */
+
+	/* Calculate CRC up to the checksum. */
+	crc = sctp_crc32c(crc, buffer, sizeof(struct sctphdr) - sizeof(__u32));
+
+	/* Skip checksum field of the header. */
+	crc = sctp_crc32c(crc, zero, sizeof(__u32));
+
+	/* Calculate the rest of the CRC. */
+	crc = sctp_crc32c(crc, &buffer[sizeof(struct sctphdr)],
+			    length - sizeof(struct sctphdr));
+	return crc;
+}
+
+static inline __u32 sctp_update_cksum(__u8 *buffer, __u16 length, __u32 crc32)
+{
+	return sctp_crc32c(crc32, buffer, length);
+}
+
+static inline __le32 sctp_end_cksum(__be32 crc32)
+{
+	return cpu_to_le32(~crc32);
+}
diff --git a/include/net/sctp/command.h b/include/net/sctp/command.h
new file mode 100644
index 00000000..712b3beb
--- /dev/null
+++ b/include/net/sctp/command.h
@@ -0,0 +1,225 @@
+/* SCTP kernel Implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (C) 1999-2001 Cisco, Motorola
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * These are the definitions needed for the command object.
+ *
+ * This SCTP implementation  is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation  is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to one of the
+ * following email addresses:
+ *
+ * La Monte H.P. Yarroll <piggy@acm.org>
+ * Karl Knutson <karl@athena.chicago.il.us>
+ * Ardelle Fan <ardelle.fan@intel.com>
+ * Sridhar Samudrala <sri@us.ibm.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+
+#ifndef __net_sctp_command_h__
+#define __net_sctp_command_h__
+
+#include <net/sctp/constants.h>
+#include <net/sctp/structs.h>
+
+
+typedef enum {
+	SCTP_CMD_NOP = 0,	/* Do nothing. */
+	SCTP_CMD_NEW_ASOC,	/* Register a new association.  */
+	SCTP_CMD_DELETE_TCB,	/* Delete the current association. */
+	SCTP_CMD_NEW_STATE,	/* Enter a new state.  */
+	SCTP_CMD_REPORT_TSN,	/* Record the arrival of a TSN.  */
+	SCTP_CMD_GEN_SACK,	/* Send a Selective ACK (maybe).  */
+	SCTP_CMD_PROCESS_SACK,	/* Process an inbound SACK.  */
+	SCTP_CMD_GEN_INIT_ACK,	/* Generate an INIT ACK chunk.  */
+	SCTP_CMD_PEER_INIT,	/* Process a INIT from the peer.  */
+	SCTP_CMD_GEN_COOKIE_ECHO, /* Generate a COOKIE ECHO chunk. */
+	SCTP_CMD_CHUNK_ULP,	/* Send a chunk to the sockets layer.  */
+	SCTP_CMD_EVENT_ULP,	/* Send a notification to the sockets layer. */
+	SCTP_CMD_REPLY,		/* Send a chunk to our peer.  */
+	SCTP_CMD_SEND_PKT,	/* Send a full packet to our peer.  */
+	SCTP_CMD_RETRAN,	/* Mark a transport for retransmission.  */
+	SCTP_CMD_ECN_CE,        /* Do delayed CE processing.   */
+	SCTP_CMD_ECN_ECNE,	/* Do delayed ECNE processing. */
+	SCTP_CMD_ECN_CWR,	/* Do delayed CWR processing.  */
+	SCTP_CMD_TIMER_START,	/* Start a timer.  */
+	SCTP_CMD_TIMER_START_ONCE, /* Start a timer once */
+	SCTP_CMD_TIMER_RESTART,	/* Restart a timer. */
+	SCTP_CMD_TIMER_STOP,	/* Stop a timer. */
+	SCTP_CMD_INIT_CHOOSE_TRANSPORT, /* Choose transport for an INIT. */
+	SCTP_CMD_INIT_COUNTER_RESET, /* Reset init counter. */
+	SCTP_CMD_INIT_COUNTER_INC,   /* Increment init counter. */
+	SCTP_CMD_INIT_RESTART,  /* High level, do init timer work. */
+	SCTP_CMD_COOKIEECHO_RESTART,  /* High level, do cookie-echo timer work. */
+	SCTP_CMD_INIT_FAILED,   /* High level, do init failure work. */
+	SCTP_CMD_REPORT_DUP,	/* Report a duplicate TSN.  */
+	SCTP_CMD_STRIKE,	/* Mark a strike against a transport.  */
+	SCTP_CMD_HB_TIMERS_START,    /* Start the heartbeat timers. */
+	SCTP_CMD_HB_TIMER_UPDATE,    /* Update a heartbeat timers.  */
+	SCTP_CMD_HB_TIMERS_STOP,     /* Stop the heartbeat timers.  */
+	SCTP_CMD_TRANSPORT_HB_SENT,  /* Reset the status of a transport. */
+	SCTP_CMD_TRANSPORT_IDLE,     /* Do manipulations on idle transport */
+	SCTP_CMD_TRANSPORT_ON,       /* Mark the transport as active. */
+	SCTP_CMD_REPORT_ERROR,   /* Pass this error back out of the sm. */
+	SCTP_CMD_REPORT_BAD_TAG, /* Verification tags didn't match. */
+	SCTP_CMD_PROCESS_CTSN,   /* Sideeffect from shutdown. */
+	SCTP_CMD_ASSOC_FAILED,	 /* Handle association failure. */
+	SCTP_CMD_DISCARD_PACKET, /* Discard the whole packet. */
+	SCTP_CMD_GEN_SHUTDOWN,   /* Generate a SHUTDOWN chunk. */
+	SCTP_CMD_UPDATE_ASSOC,   /* Update association information. */
+	SCTP_CMD_PURGE_OUTQUEUE, /* Purge all data waiting to be sent. */
+	SCTP_CMD_SETUP_T2,       /* Hi-level, setup T2-shutdown parms.  */
+	SCTP_CMD_RTO_PENDING,	 /* Set transport's rto_pending. */
+	SCTP_CMD_PART_DELIVER,	 /* Partial data delivery considerations. */
+	SCTP_CMD_RENEGE,         /* Renege data on an association. */
+	SCTP_CMD_SETUP_T4,	 /* ADDIP, setup T4 RTO timer parms. */
+	SCTP_CMD_PROCESS_OPERR,  /* Process an ERROR chunk. */
+	SCTP_CMD_REPORT_FWDTSN,	 /* Report new cumulative TSN Ack. */
+	SCTP_CMD_PROCESS_FWDTSN, /* Skips were reported, so process further. */
+	SCTP_CMD_CLEAR_INIT_TAG, /* Clears association peer's inittag. */
+	SCTP_CMD_DEL_NON_PRIMARY, /* Removes non-primary peer transports. */
+	SCTP_CMD_T3_RTX_TIMERS_STOP, /* Stops T3-rtx pending timers */
+	SCTP_CMD_FORCE_PRIM_RETRAN,  /* Forces retrans. over primary path. */
+	SCTP_CMD_SET_SK_ERR,	 /* Set sk_err */
+	SCTP_CMD_ASSOC_CHANGE,	 /* generate and send assoc_change event */
+	SCTP_CMD_ADAPTATION_IND, /* generate and send adaptation event */
+	SCTP_CMD_ASSOC_SHKEY,    /* generate the association shared keys */
+	SCTP_CMD_T1_RETRAN,	 /* Mark for retransmission after T1 timeout  */
+	SCTP_CMD_UPDATE_INITTAG, /* Update peer inittag */
+	SCTP_CMD_SEND_MSG,	 /* Send the whole use message */
+	SCTP_CMD_SEND_NEXT_ASCONF, /* Send the next ASCONF after ACK */
+	SCTP_CMD_PURGE_ASCONF_QUEUE, /* Purge all asconf queues.*/
+	SCTP_CMD_SET_ASOC,	 /* Restore association context */
+	SCTP_CMD_LAST
+} sctp_verb_t;
+
+/* How many commands can you put in an sctp_cmd_seq_t?
+ * This is a rather arbitrary number, ideally derived from a careful
+ * analysis of the state functions, but in reality just taken from
+ * thin air in the hopes othat we don't trigger a kernel panic.
+ */
+#define SCTP_MAX_NUM_COMMANDS 14
+
+typedef union {
+	__s32 i32;
+	__u32 u32;
+	__be32 be32;
+	__u16 u16;
+	__u8 u8;
+	int error;
+	__be16 err;
+	sctp_state_t state;
+	sctp_event_timeout_t to;
+	unsigned long zero;
+	void *ptr;
+	struct sctp_chunk *chunk;
+	struct sctp_association *asoc;
+	struct sctp_transport *transport;
+	struct sctp_bind_addr *bp;
+	sctp_init_chunk_t *init;
+	struct sctp_ulpevent *ulpevent;
+	struct sctp_packet *packet;
+	sctp_sackhdr_t *sackh;
+	struct sctp_datamsg *msg;
+} sctp_arg_t;
+
+/* We are simulating ML type constructors here.
+ *
+ * SCTP_ARG_CONSTRUCTOR(NAME, TYPE, ELT) builds a function called
+ * SCTP_NAME() which takes an argument of type TYPE and returns an
+ * sctp_arg_t.  It does this by inserting the sole argument into the
+ * ELT union element of a local sctp_arg_t.
+ *
+ * E.g., SCTP_ARG_CONSTRUCTOR(I32, __s32, i32) builds SCTP_I32(arg),
+ * which takes an __s32 and returns a sctp_arg_t containing the
+ * __s32.  So, after foo = SCTP_I32(arg), foo.i32 == arg.
+ */
+static inline sctp_arg_t SCTP_NULL(void)
+{
+	sctp_arg_t retval; retval.ptr = NULL; return retval;
+}
+static inline sctp_arg_t SCTP_NOFORCE(void)
+{
+	sctp_arg_t retval = {.zero = 0UL}; retval.i32 = 0; return retval;
+}
+static inline sctp_arg_t SCTP_FORCE(void)
+{
+	sctp_arg_t retval = {.zero = 0UL}; retval.i32 = 1; return retval;
+}
+
+#define SCTP_ARG_CONSTRUCTOR(name, type, elt) \
+static inline sctp_arg_t	\
+SCTP_## name (type arg)		\
+{ sctp_arg_t retval = {.zero = 0UL}; retval.elt = arg; return retval; }
+
+SCTP_ARG_CONSTRUCTOR(I32,	__s32, i32)
+SCTP_ARG_CONSTRUCTOR(U32,	__u32, u32)
+SCTP_ARG_CONSTRUCTOR(BE32,	__be32, be32)
+SCTP_ARG_CONSTRUCTOR(U16,	__u16, u16)
+SCTP_ARG_CONSTRUCTOR(U8,	__u8, u8)
+SCTP_ARG_CONSTRUCTOR(ERROR,     int, error)
+SCTP_ARG_CONSTRUCTOR(PERR,      __be16, err)	/* protocol error */
+SCTP_ARG_CONSTRUCTOR(STATE,	sctp_state_t, state)
+SCTP_ARG_CONSTRUCTOR(TO,	sctp_event_timeout_t, to)
+SCTP_ARG_CONSTRUCTOR(PTR,	void *, ptr)
+SCTP_ARG_CONSTRUCTOR(CHUNK,	struct sctp_chunk *, chunk)
+SCTP_ARG_CONSTRUCTOR(ASOC,	struct sctp_association *, asoc)
+SCTP_ARG_CONSTRUCTOR(TRANSPORT,	struct sctp_transport *, transport)
+SCTP_ARG_CONSTRUCTOR(BA,	struct sctp_bind_addr *, bp)
+SCTP_ARG_CONSTRUCTOR(PEER_INIT,	sctp_init_chunk_t *, init)
+SCTP_ARG_CONSTRUCTOR(ULPEVENT,  struct sctp_ulpevent *, ulpevent)
+SCTP_ARG_CONSTRUCTOR(PACKET,	struct sctp_packet *, packet)
+SCTP_ARG_CONSTRUCTOR(SACKH,	sctp_sackhdr_t *, sackh)
+SCTP_ARG_CONSTRUCTOR(DATAMSG,	struct sctp_datamsg *, msg)
+
+typedef struct {
+	sctp_arg_t obj;
+	sctp_verb_t verb;
+} sctp_cmd_t;
+
+typedef struct {
+	sctp_cmd_t cmds[SCTP_MAX_NUM_COMMANDS];
+	__u8 next_free_slot;
+	__u8 next_cmd;
+} sctp_cmd_seq_t;
+
+
+/* Initialize a block of memory as a command sequence.
+ * Return 0 if the initialization fails.
+ */
+int sctp_init_cmd_seq(sctp_cmd_seq_t *seq);
+
+/* Add a command to an sctp_cmd_seq_t.
+ *
+ * Use the SCTP_* constructors defined by SCTP_ARG_CONSTRUCTOR() above
+ * to wrap data which goes in the obj argument.
+ */
+void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj);
+
+/* Return the next command structure in an sctp_cmd_seq.
+ * Return NULL at the end of the sequence.
+ */
+sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq);
+
+#endif /* __net_sctp_command_h__ */
+
diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
new file mode 100644
index 00000000..942b864f
--- /dev/null
+++ b/include/net/sctp/constants.h
@@ -0,0 +1,442 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *   La Monte H.P. Yarroll <piggy@acm.org>
+ *   Karl Knutson          <karl@athena.chicago.il.us>
+ *   Randall Stewart       <randall@stewart.chicago.il.us>
+ *   Ken Morneau           <kmorneau@cisco.com>
+ *   Qiaobing Xie          <qxie1@motorola.com>
+ *   Xingang Guo           <xingang.guo@intel.com>
+ *   Sridhar Samudrala     <samudrala@us.ibm.com>
+ *   Daisy Chang           <daisyc@us.ibm.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#ifndef __sctp_constants_h__
+#define __sctp_constants_h__
+
+#include <linux/sctp.h>
+#include <linux/ipv6.h> /* For ipv6hdr. */
+#include <net/sctp/user.h>
+#include <net/tcp_states.h>  /* For TCP states used in sctp_sock_state_t */
+
+/* Value used for stream negotiation. */
+enum { SCTP_MAX_STREAM = 0xffff };
+enum { SCTP_DEFAULT_OUTSTREAMS = 10 };
+enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM };
+
+/* Since CIDs are sparse, we need all four of the following
+ * symbols.  CIDs are dense through SCTP_CID_BASE_MAX.
+ */
+#define SCTP_CID_BASE_MAX		SCTP_CID_SHUTDOWN_COMPLETE
+
+#define SCTP_NUM_BASE_CHUNK_TYPES	(SCTP_CID_BASE_MAX + 1)
+
+#define SCTP_NUM_ADDIP_CHUNK_TYPES	2
+
+#define SCTP_NUM_PRSCTP_CHUNK_TYPES	1
+
+#define SCTP_NUM_AUTH_CHUNK_TYPES	1
+
+#define SCTP_NUM_CHUNK_TYPES		(SCTP_NUM_BASE_CHUNK_TYPES + \
+					 SCTP_NUM_ADDIP_CHUNK_TYPES +\
+					 SCTP_NUM_PRSCTP_CHUNK_TYPES +\
+					 SCTP_NUM_AUTH_CHUNK_TYPES)
+
+/* These are the different flavours of event.  */
+typedef enum {
+
+	SCTP_EVENT_T_CHUNK = 1,
+	SCTP_EVENT_T_TIMEOUT,
+	SCTP_EVENT_T_OTHER,
+	SCTP_EVENT_T_PRIMITIVE
+
+} sctp_event_t;
+
+/* As a convenience for the state machine, we append SCTP_EVENT_* and
+ * SCTP_ULP_* to the list of possible chunks.
+ */
+
+typedef enum {
+	SCTP_EVENT_TIMEOUT_NONE = 0,
+	SCTP_EVENT_TIMEOUT_T1_COOKIE,
+	SCTP_EVENT_TIMEOUT_T1_INIT,
+	SCTP_EVENT_TIMEOUT_T2_SHUTDOWN,
+	SCTP_EVENT_TIMEOUT_T3_RTX,
+	SCTP_EVENT_TIMEOUT_T4_RTO,
+	SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD,
+	SCTP_EVENT_TIMEOUT_HEARTBEAT,
+	SCTP_EVENT_TIMEOUT_SACK,
+	SCTP_EVENT_TIMEOUT_AUTOCLOSE,
+} sctp_event_timeout_t;
+
+#define SCTP_EVENT_TIMEOUT_MAX		SCTP_EVENT_TIMEOUT_AUTOCLOSE
+#define SCTP_NUM_TIMEOUT_TYPES		(SCTP_EVENT_TIMEOUT_MAX + 1)
+
+typedef enum {
+	SCTP_EVENT_NO_PENDING_TSN = 0,
+	SCTP_EVENT_ICMP_PROTO_UNREACH,
+} sctp_event_other_t;
+
+#define SCTP_EVENT_OTHER_MAX		SCTP_EVENT_ICMP_PROTO_UNREACH
+#define SCTP_NUM_OTHER_TYPES		(SCTP_EVENT_OTHER_MAX + 1)
+
+/* These are primitive requests from the ULP.  */
+typedef enum {
+	SCTP_PRIMITIVE_ASSOCIATE = 0,
+	SCTP_PRIMITIVE_SHUTDOWN,
+	SCTP_PRIMITIVE_ABORT,
+	SCTP_PRIMITIVE_SEND,
+	SCTP_PRIMITIVE_REQUESTHEARTBEAT,
+	SCTP_PRIMITIVE_ASCONF,
+} sctp_event_primitive_t;
+
+#define SCTP_EVENT_PRIMITIVE_MAX	SCTP_PRIMITIVE_ASCONF
+#define SCTP_NUM_PRIMITIVE_TYPES	(SCTP_EVENT_PRIMITIVE_MAX + 1)
+
+/* We define here a utility type for manipulating subtypes.
+ * The subtype constructors all work like this:
+ *
+ * 	sctp_subtype_t foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
+ */
+
+typedef union {
+	sctp_cid_t chunk;
+	sctp_event_timeout_t timeout;
+	sctp_event_other_t other;
+	sctp_event_primitive_t primitive;
+} sctp_subtype_t;
+
+#define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \
+static inline sctp_subtype_t	\
+SCTP_ST_## _name (_type _arg)		\
+{ sctp_subtype_t _retval; _retval._elt = _arg; return _retval; }
+
+SCTP_SUBTYPE_CONSTRUCTOR(CHUNK,		sctp_cid_t,		chunk)
+SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT,	sctp_event_timeout_t,	timeout)
+SCTP_SUBTYPE_CONSTRUCTOR(OTHER,		sctp_event_other_t,	other)
+SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE,	sctp_event_primitive_t,	primitive)
+
+
+#define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA)
+
+/* Calculate the actual data size in a data chunk */
+#define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end)\
+		       		- (unsigned long)(c->chunk_hdr)\
+				- sizeof(sctp_data_chunk_t)))
+
+/* Internal error codes */
+typedef enum {
+
+	SCTP_IERROR_NO_ERROR	        = 0,
+	SCTP_IERROR_BASE		= 1000,
+	SCTP_IERROR_NO_COOKIE,
+	SCTP_IERROR_BAD_SIG,
+	SCTP_IERROR_STALE_COOKIE,
+	SCTP_IERROR_NOMEM,
+	SCTP_IERROR_MALFORMED,
+	SCTP_IERROR_BAD_TAG,
+	SCTP_IERROR_BIG_GAP,
+	SCTP_IERROR_DUP_TSN,
+	SCTP_IERROR_HIGH_TSN,
+	SCTP_IERROR_IGNORE_TSN,
+	SCTP_IERROR_NO_DATA,
+	SCTP_IERROR_BAD_STREAM,
+	SCTP_IERROR_BAD_PORTS,
+	SCTP_IERROR_AUTH_BAD_HMAC,
+	SCTP_IERROR_AUTH_BAD_KEYID,
+	SCTP_IERROR_PROTO_VIOLATION,
+	SCTP_IERROR_ERROR,
+	SCTP_IERROR_ABORT,
+} sctp_ierror_t;
+
+
+
+/* SCTP state defines for internal state machine */
+typedef enum {
+
+	SCTP_STATE_CLOSED		= 0,
+	SCTP_STATE_COOKIE_WAIT		= 1,
+	SCTP_STATE_COOKIE_ECHOED	= 2,
+	SCTP_STATE_ESTABLISHED		= 3,
+	SCTP_STATE_SHUTDOWN_PENDING	= 4,
+	SCTP_STATE_SHUTDOWN_SENT	= 5,
+	SCTP_STATE_SHUTDOWN_RECEIVED	= 6,
+	SCTP_STATE_SHUTDOWN_ACK_SENT	= 7,
+
+} sctp_state_t;
+
+#define SCTP_STATE_MAX			SCTP_STATE_SHUTDOWN_ACK_SENT
+#define SCTP_STATE_NUM_STATES		(SCTP_STATE_MAX + 1)
+
+/* These are values for sk->state.
+ * For a UDP-style SCTP socket, the states are defined as follows
+ * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
+ *   accept new associations, but it can initiate the creation of new ones.
+ * - A socket in SCTP_SS_LISTENING state indicates that it is willing to
+ *   accept new  associations and can initiate the creation of new ones.
+ * - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off
+ *   socket with one association.
+ * For a TCP-style SCTP socket, the states are defined as follows
+ * - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
+ *   accept new associations, but it can initiate the creation of new ones.
+ * - A socket in SCTP_SS_LISTENING state indicates that it is willing to
+ *   accept new associations, but cannot initiate the creation of new ones.
+ * - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single 
+ *   association.
+ */
+typedef enum {
+	SCTP_SS_CLOSED         = TCP_CLOSE,
+	SCTP_SS_LISTENING      = TCP_LISTEN,
+	SCTP_SS_ESTABLISHING   = TCP_SYN_SENT,
+	SCTP_SS_ESTABLISHED    = TCP_ESTABLISHED,
+	SCTP_SS_CLOSING        = TCP_CLOSING,
+} sctp_sock_state_t;
+
+/* These functions map various type to printable names.  */
+const char *sctp_cname(const sctp_subtype_t);	/* chunk types */
+const char *sctp_oname(const sctp_subtype_t);	/* other events */
+const char *sctp_tname(const sctp_subtype_t);	/* timeouts */
+const char *sctp_pname(const sctp_subtype_t);	/* primitives */
+
+/* This is a table of printable names of sctp_state_t's.  */
+extern const char *const sctp_state_tbl[];
+extern const char *const sctp_evttype_tbl[];
+extern const char *const sctp_status_tbl[];
+
+/* Maximum chunk length considering padding requirements. */
+enum { SCTP_MAX_CHUNK_LEN = ((1<<16) - sizeof(__u32)) };
+
+/* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little
+ * harder (until reaching ESTABLISHED state).
+ */
+enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN = 200 };
+
+/* Guess at how big to make the TSN mapping array.
+ * We guarantee that we can handle at least this big a gap between the
+ * cumulative ACK and the highest TSN.  In practice, we can often
+ * handle up to twice this value.
+ *
+ * NEVER make this more than 32767 (2^15-1).  The Gap Ack Blocks in a
+ * SACK (see  section 3.3.4) are only 16 bits, so 2*SCTP_TSN_MAP_SIZE
+ * must be less than 65535 (2^16 - 1), or we will have overflow
+ * problems creating SACK's.
+ */
+#define SCTP_TSN_MAP_INITIAL BITS_PER_LONG
+#define SCTP_TSN_MAP_INCREMENT SCTP_TSN_MAP_INITIAL
+#define SCTP_TSN_MAP_SIZE 4096
+
+/* We will not record more than this many duplicate TSNs between two
+ * SACKs.  The minimum PMTU is 576.  Remove all the headers and there
+ * is enough room for 131 duplicate reports.  Round down to the
+ * nearest power of 2.
+ */
+enum { SCTP_MIN_PMTU = 576 };
+enum { SCTP_MAX_DUP_TSNS = 16 };
+enum { SCTP_MAX_GABS = 16 };
+
+/* Heartbeat interval - 30 secs */
+#define SCTP_DEFAULT_TIMEOUT_HEARTBEAT	(30*1000)
+
+/* Delayed sack timer - 200ms */
+#define SCTP_DEFAULT_TIMEOUT_SACK	(200)
+
+/* RTO.Initial              - 3  seconds
+ * RTO.Min                  - 1  second
+ * RTO.Max                  - 60 seconds
+ * RTO.Alpha                - 1/8
+ * RTO.Beta                 - 1/4
+ */
+#define SCTP_RTO_INITIAL	(3 * 1000)
+#define SCTP_RTO_MIN		(1 * 1000)
+#define SCTP_RTO_MAX		(60 * 1000)
+
+#define SCTP_RTO_ALPHA          3   /* 1/8 when converted to right shifts. */
+#define SCTP_RTO_BETA           2   /* 1/4 when converted to right shifts. */
+
+/* Maximum number of new data packets that can be sent in a burst.  */
+#define SCTP_DEFAULT_MAX_BURST		4
+
+#define SCTP_CLOCK_GRANULARITY	1	/* 1 jiffy */
+
+#define SCTP_DEFAULT_COOKIE_LIFE	(60 * 1000) /* 60 seconds */
+
+#define SCTP_DEFAULT_MINWINDOW	1500	/* default minimum rwnd size */
+#define SCTP_DEFAULT_MAXWINDOW	65535	/* default rwnd size */
+#define SCTP_DEFAULT_RWND_SHIFT  4	/* by default, update on 1/16 of
+					 * rcvbuf, which is 1/8 of initial
+					 * window
+					 */
+#define SCTP_DEFAULT_MAXSEGMENT 1500	/* MTU size, this is the limit
+                                         * to which we will raise the P-MTU.
+					 */
+#define SCTP_DEFAULT_MINSEGMENT 512	/* MTU size ... if no mtu disc */
+#define SCTP_HOW_MANY_SECRETS 2		/* How many secrets I keep */
+#define SCTP_SECRET_SIZE 32		/* Number of octets in a 256 bits. */
+
+#define SCTP_SIGNATURE_SIZE 20	        /* size of a SLA-1 signature */
+
+#define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash
+				 * functions simpler to write.
+				 */
+
+#if defined (CONFIG_SCTP_HMAC_MD5)
+#define SCTP_COOKIE_HMAC_ALG "hmac(md5)"
+#elif defined (CONFIG_SCTP_HMAC_SHA1)
+#define SCTP_COOKIE_HMAC_ALG "hmac(sha1)"
+#else
+#define SCTP_COOKIE_HMAC_ALG NULL
+#endif
+
+/* These return values describe the success or failure of a number of
+ * routines which form the lower interface to SCTP_outqueue.
+ */
+typedef enum {
+	SCTP_XMIT_OK,
+	SCTP_XMIT_PMTU_FULL,
+	SCTP_XMIT_RWND_FULL,
+	SCTP_XMIT_NAGLE_DELAY,
+} sctp_xmit_t;
+
+/* These are the commands for manipulating transports.  */
+typedef enum {
+	SCTP_TRANSPORT_UP,
+	SCTP_TRANSPORT_DOWN,
+} sctp_transport_cmd_t;
+
+/* These are the address scopes defined mainly for IPv4 addresses
+ * based on draft of SCTP IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
+ * These scopes are hopefully generic enough to be used on scoping both
+ * IPv4 and IPv6 addresses in SCTP.
+ * At this point, the IPv6 scopes will be mapped to these internal scopes
+ * as much as possible.
+ */
+typedef enum {
+	SCTP_SCOPE_GLOBAL,		/* IPv4 global addresses */
+	SCTP_SCOPE_PRIVATE,		/* IPv4 private addresses */
+	SCTP_SCOPE_LINK,		/* IPv4 link local address */
+	SCTP_SCOPE_LOOPBACK,		/* IPv4 loopback address */
+	SCTP_SCOPE_UNUSABLE,		/* IPv4 unusable addresses */
+} sctp_scope_t;
+
+typedef enum {
+	SCTP_SCOPE_POLICY_DISABLE,	/* Disable IPv4 address scoping */
+	SCTP_SCOPE_POLICY_ENABLE,	/* Enable IPv4 address scoping */
+	SCTP_SCOPE_POLICY_PRIVATE,	/* Follow draft but allow IPv4 private addresses */
+	SCTP_SCOPE_POLICY_LINK,		/* Follow draft but allow IPv4 link local addresses */
+} sctp_scope_policy_t;
+
+/* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>,
+ * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24,
+ * 192.88.99.0/24.
+ * Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
+ * addresses.
+ */
+#define IS_IPV4_UNUSABLE_ADDRESS(a)	    \
+	((htonl(INADDR_BROADCAST) == a) ||  \
+	 ipv4_is_multicast(a) ||	    \
+	 ipv4_is_zeronet(a) ||		    \
+	 ipv4_is_test_198(a) ||		    \
+	 ipv4_is_anycast_6to4(a))
+
+/* Flags used for the bind address copy functions.  */
+#define SCTP_ADDR6_ALLOWED	0x00000001	/* IPv6 address is allowed by
+						   local sock family */
+#define SCTP_ADDR4_PEERSUPP	0x00000002	/* IPv4 address is supported by
+						   peer */
+#define SCTP_ADDR6_PEERSUPP	0x00000004	/* IPv6 address is supported by
+						   peer */
+
+/* Reasons to retransmit. */
+typedef enum {
+	SCTP_RTXR_T3_RTX,
+	SCTP_RTXR_FAST_RTX,
+	SCTP_RTXR_PMTUD,
+	SCTP_RTXR_T1_RTX,
+} sctp_retransmit_reason_t;
+
+/* Reasons to lower cwnd. */
+typedef enum {
+	SCTP_LOWER_CWND_T3_RTX,
+	SCTP_LOWER_CWND_FAST_RTX,
+	SCTP_LOWER_CWND_ECNE,
+	SCTP_LOWER_CWND_INACTIVE,
+} sctp_lower_cwnd_t;
+
+
+/* SCTP-AUTH Necessary constants */
+
+/* SCTP-AUTH, Section 3.3
+ *
+ *  The following Table 2 shows the currently defined values for HMAC
+ *  identifiers.
+ *
+ *  +-----------------+--------------------------+
+ *  | HMAC Identifier | Message Digest Algorithm |
+ *  +-----------------+--------------------------+
+ *  | 0               | Reserved                 |
+ *  | 1               | SHA-1 defined in [8]     |
+ *  | 2               | Reserved                 |
+ *  | 3               | SHA-256 defined in [8]   |
+ *  +-----------------+--------------------------+
+ */
+enum {
+	SCTP_AUTH_HMAC_ID_RESERVED_0,
+	SCTP_AUTH_HMAC_ID_SHA1,
+	SCTP_AUTH_HMAC_ID_RESERVED_2,
+#if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE)
+	SCTP_AUTH_HMAC_ID_SHA256,
+#endif
+	__SCTP_AUTH_HMAC_MAX
+};
+
+#define SCTP_AUTH_HMAC_ID_MAX	__SCTP_AUTH_HMAC_MAX - 1
+#define SCTP_AUTH_NUM_HMACS 	__SCTP_AUTH_HMAC_MAX
+#define SCTP_SHA1_SIG_SIZE 20
+#define SCTP_SHA256_SIG_SIZE 32
+
+/*  SCTP-AUTH, Section 3.2
+ *     The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks
+ *     MUST NOT be listed in the CHUNKS parameter
+ */
+#define SCTP_NUM_NOAUTH_CHUNKS	4
+#define SCTP_AUTH_MAX_CHUNKS	(SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
+
+/* SCTP-AUTH Section 6.1
+ * The RANDOM parameter MUST contain a 32 byte random number.
+ */
+#define SCTP_AUTH_RANDOM_LENGTH 32
+
+#endif /* __sctp_constants_h__ */
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
new file mode 100644
index 00000000..a2ef8146
--- /dev/null
+++ b/include/net/sctp/sctp.h
@@ -0,0 +1,720 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001-2003 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * The base lksctp header.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Xingang Guo           <xingang.guo@intel.com>
+ *    Jon Grimm             <jgrimm@us.ibm.com>
+ *    Daisy Chang           <daisyc@us.ibm.com>
+ *    Sridhar Samudrala     <sri@us.ibm.com>
+ *    Ardelle Fan           <ardelle.fan@intel.com>
+ *    Ryan Layer            <rmlayer@us.ibm.com>
+ *    Kevin Gao             <kevin.gao@intel.com> 
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#ifndef __net_sctp_h__
+#define __net_sctp_h__
+
+/* Header Strategy.
+ *    Start getting some control over the header file depencies:
+ *       includes
+ *       constants
+ *       structs
+ *       prototypes
+ *       macros, externs, and inlines
+ *
+ *   Move test_frame specific items out of the kernel headers
+ *   and into the test frame headers.   This is not perfect in any sense
+ *   and will continue to evolve.
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/tty.h>
+#include <linux/proc_fs.h>
+#include <linux/spinlock.h>
+#include <linux/jiffies.h>
+#include <linux/idr.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#endif
+
+#include <asm/uaccess.h>
+#include <asm/page.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+#include <net/sctp/structs.h>
+#include <net/sctp/constants.h>
+
+
+/* Set SCTP_DEBUG flag via config if not already set. */
+#ifndef SCTP_DEBUG
+#ifdef CONFIG_SCTP_DBG_MSG
+#define SCTP_DEBUG	1
+#else
+#define SCTP_DEBUG      0
+#endif /* CONFIG_SCTP_DBG */
+#endif /* SCTP_DEBUG */
+
+#ifdef CONFIG_IP_SCTP_MODULE
+#define SCTP_PROTOSW_FLAG 0
+#else /* static! */
+#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
+#endif
+
+
+/* Certain internal static functions need to be exported when
+ * compiled into the test frame.
+ */
+#ifndef SCTP_STATIC
+#define SCTP_STATIC static
+#endif
+
+/*
+ * Function declarations.
+ */
+
+/*
+ * sctp/protocol.c
+ */
+extern struct sock *sctp_get_ctl_sock(void);
+extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
+				     sctp_scope_t, gfp_t gfp,
+				     int flags);
+extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
+extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
+extern void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *, int);
+
+/*
+ * sctp/socket.c
+ */
+int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
+int sctp_inet_listen(struct socket *sock, int backlog);
+void sctp_write_space(struct sock *sk);
+void sctp_data_ready(struct sock *sk, int len);
+unsigned int sctp_poll(struct file *file, struct socket *sock,
+		poll_table *wait);
+void sctp_sock_rfree(struct sk_buff *skb);
+void sctp_copy_sock(struct sock *newsk, struct sock *sk,
+		    struct sctp_association *asoc);
+extern struct percpu_counter sctp_sockets_allocated;
+extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
+
+/*
+ * sctp/primitive.c
+ */
+int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
+int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
+int sctp_primitive_ABORT(struct sctp_association *, void *arg);
+int sctp_primitive_SEND(struct sctp_association *, void *arg);
+int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
+int sctp_primitive_ASCONF(struct sctp_association *, void *arg);
+
+/*
+ * sctp/input.c
+ */
+int sctp_rcv(struct sk_buff *skb);
+void sctp_v4_err(struct sk_buff *skb, u32 info);
+void sctp_hash_established(struct sctp_association *);
+void sctp_unhash_established(struct sctp_association *);
+void sctp_hash_endpoint(struct sctp_endpoint *);
+void sctp_unhash_endpoint(struct sctp_endpoint *);
+struct sock *sctp_err_lookup(int family, struct sk_buff *,
+			     struct sctphdr *, struct sctp_association **,
+			     struct sctp_transport **);
+void sctp_err_finish(struct sock *, struct sctp_association *);
+void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
+			   struct sctp_transport *t, __u32 pmtu);
+void sctp_icmp_proto_unreachable(struct sock *sk,
+				 struct sctp_association *asoc,
+				 struct sctp_transport *t);
+void sctp_backlog_migrate(struct sctp_association *assoc,
+			  struct sock *oldsk, struct sock *newsk);
+
+/*
+ * sctp/proc.c
+ */
+int sctp_snmp_proc_init(void);
+void sctp_snmp_proc_exit(void);
+int sctp_eps_proc_init(void);
+void sctp_eps_proc_exit(void);
+int sctp_assocs_proc_init(void);
+void sctp_assocs_proc_exit(void);
+int sctp_remaddr_proc_init(void);
+void sctp_remaddr_proc_exit(void);
+
+
+/*
+ * Module global variables
+ */
+
+ /*
+  * sctp/protocol.c
+  */
+extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
+extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
+
+/*
+ *  Section:  Macros, externs, and inlines
+ */
+
+
+#ifdef TEST_FRAME
+#include <test_frame.h>
+#else
+
+/* spin lock wrappers. */
+#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
+#define sctp_spin_unlock_irqrestore(lock, flags)  \
+       spin_unlock_irqrestore(lock, flags)
+#define sctp_local_bh_disable() local_bh_disable()
+#define sctp_local_bh_enable()  local_bh_enable()
+#define sctp_spin_lock(lock)    spin_lock(lock)
+#define sctp_spin_unlock(lock)  spin_unlock(lock)
+#define sctp_write_lock(lock)   write_lock(lock)
+#define sctp_write_unlock(lock) write_unlock(lock)
+#define sctp_read_lock(lock)    read_lock(lock)
+#define sctp_read_unlock(lock)  read_unlock(lock)
+
+/* sock lock wrappers. */
+#define sctp_lock_sock(sk)       lock_sock(sk)
+#define sctp_release_sock(sk)    release_sock(sk)
+#define sctp_bh_lock_sock(sk)    bh_lock_sock(sk)
+#define sctp_bh_unlock_sock(sk)  bh_unlock_sock(sk)
+
+/* SCTP SNMP MIB stats handlers */
+DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
+#define SCTP_INC_STATS(field)      SNMP_INC_STATS(sctp_statistics, field)
+#define SCTP_INC_STATS_BH(field)   SNMP_INC_STATS_BH(sctp_statistics, field)
+#define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
+#define SCTP_DEC_STATS(field)      SNMP_DEC_STATS(sctp_statistics, field)
+
+#endif /* !TEST_FRAME */
+
+/* sctp mib definitions */
+enum {
+	SCTP_MIB_NUM = 0,
+	SCTP_MIB_CURRESTAB,			/* CurrEstab */
+	SCTP_MIB_ACTIVEESTABS,			/* ActiveEstabs */
+	SCTP_MIB_PASSIVEESTABS,			/* PassiveEstabs */
+	SCTP_MIB_ABORTEDS,			/* Aborteds */
+	SCTP_MIB_SHUTDOWNS,			/* Shutdowns */
+	SCTP_MIB_OUTOFBLUES,			/* OutOfBlues */
+	SCTP_MIB_CHECKSUMERRORS,		/* ChecksumErrors */
+	SCTP_MIB_OUTCTRLCHUNKS,			/* OutCtrlChunks */
+	SCTP_MIB_OUTORDERCHUNKS,		/* OutOrderChunks */
+	SCTP_MIB_OUTUNORDERCHUNKS,		/* OutUnorderChunks */
+	SCTP_MIB_INCTRLCHUNKS,			/* InCtrlChunks */
+	SCTP_MIB_INORDERCHUNKS,			/* InOrderChunks */
+	SCTP_MIB_INUNORDERCHUNKS,		/* InUnorderChunks */
+	SCTP_MIB_FRAGUSRMSGS,			/* FragUsrMsgs */
+	SCTP_MIB_REASMUSRMSGS,			/* ReasmUsrMsgs */
+	SCTP_MIB_OUTSCTPPACKS,			/* OutSCTPPacks */
+	SCTP_MIB_INSCTPPACKS,			/* InSCTPPacks */
+	SCTP_MIB_T1_INIT_EXPIREDS,
+	SCTP_MIB_T1_COOKIE_EXPIREDS,
+	SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
+	SCTP_MIB_T3_RTX_EXPIREDS,
+	SCTP_MIB_T4_RTO_EXPIREDS,
+	SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
+	SCTP_MIB_DELAY_SACK_EXPIREDS,
+	SCTP_MIB_AUTOCLOSE_EXPIREDS,
+	SCTP_MIB_T1_RETRANSMITS,
+	SCTP_MIB_T3_RETRANSMITS,
+	SCTP_MIB_PMTUD_RETRANSMITS,
+	SCTP_MIB_FAST_RETRANSMITS,
+	SCTP_MIB_IN_PKT_SOFTIRQ,
+	SCTP_MIB_IN_PKT_BACKLOG,
+	SCTP_MIB_IN_PKT_DISCARDS,
+	SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
+	__SCTP_MIB_MAX
+};
+
+#define SCTP_MIB_MAX    __SCTP_MIB_MAX
+struct sctp_mib {
+        unsigned long   mibs[SCTP_MIB_MAX];
+};
+
+
+/* Print debugging messages.  */
+#if SCTP_DEBUG
+extern int sctp_debug_flag;
+#define SCTP_DEBUG_PRINTK(fmt, args...)			\
+do {							\
+	if (sctp_debug_flag)				\
+		printk(KERN_DEBUG pr_fmt(fmt), ##args);	\
+} while (0)
+#define SCTP_DEBUG_PRINTK_CONT(fmt, args...)		\
+do {							\
+	if (sctp_debug_flag)				\
+		pr_cont(fmt, ##args);			\
+} while (0)
+#define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail,			\
+				 args_lead, addr, args_trail...)	\
+do {									\
+	const union sctp_addr *_addr = (addr);				\
+	if (sctp_debug_flag) {						\
+		if (_addr->sa.sa_family == AF_INET6) {			\
+			printk(KERN_DEBUG				\
+			       pr_fmt(fmt_lead "%pI6" fmt_trail),	\
+			       args_lead,				\
+			       &_addr->v6.sin6_addr,			\
+			       args_trail);				\
+		} else {						\
+			printk(KERN_DEBUG				\
+			       pr_fmt(fmt_lead "%pI4" fmt_trail),	\
+			       args_lead,				\
+			       &_addr->v4.sin_addr.s_addr,		\
+			       args_trail);				\
+		}							\
+	}								\
+} while (0)
+#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
+#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
+
+#define SCTP_ASSERT(expr, str, func) \
+	if (!(expr)) { \
+		SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
+			str, (#expr), __FILE__, __func__, __LINE__); \
+		func; \
+	}
+
+#else	/* SCTP_DEBUG */
+
+#define SCTP_DEBUG_PRINTK(whatever...)
+#define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
+#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
+#define SCTP_ENABLE_DEBUG
+#define SCTP_DISABLE_DEBUG
+#define SCTP_ASSERT(expr, str, func)
+
+#endif /* SCTP_DEBUG */
+
+
+/*
+ * Macros for keeping a global reference of object allocations.
+ */
+#ifdef CONFIG_SCTP_DBG_OBJCNT
+
+extern atomic_t sctp_dbg_objcnt_sock;
+extern atomic_t sctp_dbg_objcnt_ep;
+extern atomic_t sctp_dbg_objcnt_assoc;
+extern atomic_t sctp_dbg_objcnt_transport;
+extern atomic_t sctp_dbg_objcnt_chunk;
+extern atomic_t sctp_dbg_objcnt_bind_addr;
+extern atomic_t sctp_dbg_objcnt_bind_bucket;
+extern atomic_t sctp_dbg_objcnt_addr;
+extern atomic_t sctp_dbg_objcnt_ssnmap;
+extern atomic_t sctp_dbg_objcnt_datamsg;
+extern atomic_t sctp_dbg_objcnt_keys;
+
+/* Macros to atomically increment/decrement objcnt counters.  */
+#define SCTP_DBG_OBJCNT_INC(name) \
+atomic_inc(&sctp_dbg_objcnt_## name)
+#define SCTP_DBG_OBJCNT_DEC(name) \
+atomic_dec(&sctp_dbg_objcnt_## name)
+#define SCTP_DBG_OBJCNT(name) \
+atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
+
+/* Macro to help create new entries in in the global array of
+ * objcnt counters.
+ */
+#define SCTP_DBG_OBJCNT_ENTRY(name) \
+{.label= #name, .counter= &sctp_dbg_objcnt_## name}
+
+void sctp_dbg_objcnt_init(void);
+void sctp_dbg_objcnt_exit(void);
+
+#else
+
+#define SCTP_DBG_OBJCNT_INC(name)
+#define SCTP_DBG_OBJCNT_DEC(name)
+
+static inline void sctp_dbg_objcnt_init(void) { return; }
+static inline void sctp_dbg_objcnt_exit(void) { return; }
+
+#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
+
+#if defined CONFIG_SYSCTL
+void sctp_sysctl_register(void);
+void sctp_sysctl_unregister(void);
+#else
+static inline void sctp_sysctl_register(void) { return; }
+static inline void sctp_sysctl_unregister(void) { return; }
+#endif
+
+/* Size of Supported Address Parameter for 'x' address types. */
+#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
+
+#if IS_ENABLED(CONFIG_IPV6)
+
+void sctp_v6_pf_init(void);
+void sctp_v6_pf_exit(void);
+int sctp_v6_protosw_init(void);
+void sctp_v6_protosw_exit(void);
+int sctp_v6_add_protocol(void);
+void sctp_v6_del_protocol(void);
+
+#else /* #ifdef defined(CONFIG_IPV6) */
+
+static inline void sctp_v6_pf_init(void) { return; }
+static inline void sctp_v6_pf_exit(void) { return; }
+static inline int sctp_v6_protosw_init(void) { return 0; }
+static inline void sctp_v6_protosw_exit(void) { return; }
+static inline int sctp_v6_add_protocol(void) { return 0; }
+static inline void sctp_v6_del_protocol(void) { return; }
+
+#endif /* #if defined(CONFIG_IPV6) */
+
+
+/* Map an association to an assoc_id. */
+static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
+{
+	return asoc ? asoc->assoc_id : 0;
+}
+
+/* Look up the association by its id.  */
+struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
+
+int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
+
+/* A macro to walk a list of skbs.  */
+#define sctp_skb_for_each(pos, head, tmp) \
+	skb_queue_walk_safe(head, pos, tmp)
+
+/* A helper to append an entire skb list (list) to another (head). */
+static inline void sctp_skb_list_tail(struct sk_buff_head *list,
+				      struct sk_buff_head *head)
+{
+	unsigned long flags;
+
+	sctp_spin_lock_irqsave(&head->lock, flags);
+	sctp_spin_lock(&list->lock);
+
+	skb_queue_splice_tail_init(list, head);
+
+	sctp_spin_unlock(&list->lock);
+	sctp_spin_unlock_irqrestore(&head->lock, flags);
+}
+
+/**
+ *	sctp_list_dequeue - remove from the head of the queue
+ *	@list: list to dequeue from
+ *
+ *	Remove the head of the list. The head item is
+ *	returned or %NULL if the list is empty.
+ */
+
+static inline struct list_head *sctp_list_dequeue(struct list_head *list)
+{
+	struct list_head *result = NULL;
+
+	if (list->next != list) {
+		result = list->next;
+		list->next = result->next;
+		list->next->prev = list;
+		INIT_LIST_HEAD(result);
+	}
+	return result;
+}
+
+/* SCTP version of skb_set_owner_r.  We need this one because
+ * of the way we have to do receive buffer accounting on bundled
+ * chunks.
+ */
+static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
+{
+	struct sctp_ulpevent *event = sctp_skb2event(skb);
+
+	skb_orphan(skb);
+	skb->sk = sk;
+	skb->destructor = sctp_sock_rfree;
+	atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
+	/*
+	 * This mimics the behavior of skb_set_owner_r
+	 */
+	sk->sk_forward_alloc -= event->rmem_len;
+}
+
+/* Tests if the list has one and only one entry. */
+static inline int sctp_list_single_entry(struct list_head *head)
+{
+	return (head->next != head) && (head->next == head->prev);
+}
+
+/* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
+static inline __s32 sctp_jitter(__u32 rto)
+{
+	static __u32 sctp_rand;
+	__s32 ret;
+
+	/* Avoid divide by zero. */
+	if (!rto)
+		rto = 1;
+
+	sctp_rand += jiffies;
+	sctp_rand ^= (sctp_rand << 12);
+	sctp_rand ^= (sctp_rand >> 20);
+
+	/* Choose random number from 0 to rto, then move to -50% ~ +50%
+	 * of rto.
+	 */
+	ret = sctp_rand % rto - (rto >> 1);
+	return ret;
+}
+
+/* Break down data chunks at this point.  */
+static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
+{
+	struct sctp_sock *sp = sctp_sk(asoc->base.sk);
+	int frag = pmtu;
+
+	frag -= sp->pf->af->net_header_len;
+	frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
+
+	if (asoc->user_frag)
+		frag = min_t(int, frag, asoc->user_frag);
+
+	frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
+
+	return frag;
+}
+
+static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
+{
+
+	sctp_assoc_sync_pmtu(asoc);
+	asoc->pmtu_pending = 0;
+}
+
+/* Walk through a list of TLV parameters.  Don't trust the
+ * individual parameter lengths and instead depend on
+ * the chunk length to indicate when to stop.  Make sure
+ * there is room for a param header too.
+ */
+#define sctp_walk_params(pos, chunk, member)\
+_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
+
+#define _sctp_walk_params(pos, chunk, end, member)\
+for (pos.v = chunk->member;\
+     pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
+     ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
+     pos.v += WORD_ROUND(ntohs(pos.p->length)))
+
+#define sctp_walk_errors(err, chunk_hdr)\
+_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
+
+#define _sctp_walk_errors(err, chunk_hdr, end)\
+for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
+	    sizeof(sctp_chunkhdr_t));\
+     (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
+     ntohs(err->length) >= sizeof(sctp_errhdr_t); \
+     err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
+
+#define sctp_walk_fwdtsn(pos, chunk)\
+_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
+
+#define _sctp_walk_fwdtsn(pos, chunk, end)\
+for (pos = chunk->subh.fwdtsn_hdr->skip;\
+     (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
+     pos++)
+
+/* Round an int up to the next multiple of 4.  */
+#define WORD_ROUND(s) (((s)+3)&~3)
+
+/* Make a new instance of type.  */
+#define t_new(type, flags)	(type *)kzalloc(sizeof(type), flags)
+
+/* Compare two timevals.  */
+#define tv_lt(s, t) \
+   (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
+
+/* Add tv1 to tv2. */
+#define TIMEVAL_ADD(tv1, tv2) \
+({ \
+        suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
+        time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
+\
+        if (usecs >= 1000000) { \
+                usecs -= 1000000; \
+                secs++; \
+        } \
+        (tv2).tv_sec = secs; \
+        (tv2).tv_usec = usecs; \
+})
+
+/* External references. */
+
+extern struct proto sctp_prot;
+extern struct proto sctpv6_prot;
+extern struct proc_dir_entry *proc_net_sctp;
+void sctp_put_port(struct sock *sk);
+
+extern struct idr sctp_assocs_id;
+extern spinlock_t sctp_assocs_id_lock;
+
+/* Static inline functions. */
+
+/* Convert from an IP version number to an Address Family symbol.  */
+static inline int ipver2af(__u8 ipver)
+{
+	switch (ipver) {
+	case 4:
+	        return  AF_INET;
+	case 6:
+		return AF_INET6;
+	default:
+		return 0;
+	}
+}
+
+/* Convert from an address parameter type to an address family.  */
+static inline int param_type2af(__be16 type)
+{
+	switch (type) {
+	case SCTP_PARAM_IPV4_ADDRESS:
+	        return  AF_INET;
+	case SCTP_PARAM_IPV6_ADDRESS:
+		return AF_INET6;
+	default:
+		return 0;
+	}
+}
+
+/* Perform some sanity checks. */
+static inline int sctp_sanity_check(void)
+{
+	SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
+		    sizeof(((struct sk_buff *)0)->cb),
+		    "SCTP: ulpevent does not fit in skb!\n", return 0);
+
+	return 1;
+}
+
+/* Warning: The following hash functions assume a power of two 'size'. */
+/* This is the hash function for the SCTP port hash table. */
+static inline int sctp_phashfn(__u16 lport)
+{
+	return lport & (sctp_port_hashsize - 1);
+}
+
+/* This is the hash function for the endpoint hash table. */
+static inline int sctp_ep_hashfn(__u16 lport)
+{
+	return lport & (sctp_ep_hashsize - 1);
+}
+
+/* This is the hash function for the association hash table. */
+static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
+{
+	int h = (lport << 16) + rport;
+	h ^= h>>8;
+	return h & (sctp_assoc_hashsize - 1);
+}
+
+/* This is the hash function for the association hash table.  This is
+ * not used yet, but could be used as a better hash function when
+ * we have a vtag.
+ */
+static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
+{
+	int h = (lport << 16) + rport;
+	h ^= vtag;
+	return h & (sctp_assoc_hashsize - 1);
+}
+
+#define sctp_for_each_hentry(epb, node, head) \
+	hlist_for_each_entry(epb, node, head, node)
+
+/* Is a socket of this style? */
+#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
+static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
+{
+	return sctp_sk(sk)->type == style;
+}
+
+/* Is the association in this state? */
+#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
+static inline int __sctp_state(const struct sctp_association *asoc,
+			       sctp_state_t state)
+{
+	return asoc->state == state;
+}
+
+/* Is the socket in this state? */
+#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
+static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
+{
+	return sk->sk_state == state;
+}
+
+/* Map v4-mapped v6 address back to v4 address */
+static inline void sctp_v6_map_v4(union sctp_addr *addr)
+{
+	addr->v4.sin_family = AF_INET;
+	addr->v4.sin_port = addr->v6.sin6_port;
+	addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
+}
+
+/* Map v4 address to v4-mapped v6 address */
+static inline void sctp_v4_map_v6(union sctp_addr *addr)
+{
+	addr->v6.sin6_family = AF_INET6;
+	addr->v6.sin6_port = addr->v4.sin_port;
+	addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
+	addr->v6.sin6_addr.s6_addr32[0] = 0;
+	addr->v6.sin6_addr.s6_addr32[1] = 0;
+	addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
+}
+
+/* The cookie is always 0 since this is how it's used in the
+ * pmtu code.
+ */
+static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
+{
+	if (t->dst && !dst_check(t->dst, 0)) {
+		dst_release(t->dst);
+		t->dst = NULL;
+	}
+
+	return t->dst;
+}
+
+#endif /* __net_sctp_h__ */
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
new file mode 100644
index 00000000..9148632b
--- /dev/null
+++ b/include/net/sctp/sm.h
@@ -0,0 +1,448 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * These are definitions needed by the state machine.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresses:
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Karl Knutson <karl@athena.chicago.il.us>
+ *    Xingang Guo <xingang.guo@intel.com>
+ *    Jon Grimm <jgrimm@us.ibm.com>
+ *    Dajiang Zhang <dajiang.zhang@nokia.com>
+ *    Sridhar Samudrala <sri@us.ibm.com>
+ *    Daisy Chang <daisyc@us.ibm.com>
+ *    Ardelle Fan <ardelle.fan@intel.com>
+ *    Kevin Gao <kevin.gao@intel.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <net/sctp/command.h>
+#include <net/sctp/sctp.h>
+
+#ifndef __sctp_sm_h__
+#define __sctp_sm_h__
+
+/*
+ * Possible values for the disposition are:
+ */
+typedef enum {
+	SCTP_DISPOSITION_DISCARD,	 /* No further processing.  */
+	SCTP_DISPOSITION_CONSUME,	 /* Process return values normally.  */
+	SCTP_DISPOSITION_NOMEM,		 /* We ran out of memory--recover.  */
+	SCTP_DISPOSITION_DELETE_TCB,	 /* Close the association.  */
+	SCTP_DISPOSITION_ABORT,		 /* Close the association NOW.  */
+	SCTP_DISPOSITION_VIOLATION,	 /* The peer is misbehaving.  */
+	SCTP_DISPOSITION_NOT_IMPL,	 /* This entry is not implemented.  */
+	SCTP_DISPOSITION_ERROR,		 /* This is plain old user error.  */
+	SCTP_DISPOSITION_BUG,		 /* This is a bug.  */
+} sctp_disposition_t;
+
+typedef struct {
+	int name;
+	int action;
+} sctp_sm_command_t;
+
+typedef sctp_disposition_t (sctp_state_fn_t) (const struct sctp_endpoint *,
+					      const struct sctp_association *,
+					      const sctp_subtype_t type,
+					      void *arg,
+					      sctp_cmd_seq_t *);
+typedef void (sctp_timer_event_t) (unsigned long);
+typedef struct {
+	sctp_state_fn_t *fn;
+	const char *name;
+} sctp_sm_table_entry_t;
+
+/* A naming convention of "sctp_sf_xxx" applies to all the state functions
+ * currently in use.
+ */
+
+/* Prototypes for generic state functions. */
+sctp_state_fn_t sctp_sf_not_impl;
+sctp_state_fn_t sctp_sf_bug;
+
+/* Prototypes for gener timer state functions. */
+sctp_state_fn_t sctp_sf_timer_ignore;
+
+/* Prototypes for chunk state functions. */
+sctp_state_fn_t sctp_sf_do_9_1_abort;
+sctp_state_fn_t sctp_sf_cookie_wait_abort;
+sctp_state_fn_t sctp_sf_cookie_echoed_abort;
+sctp_state_fn_t sctp_sf_shutdown_pending_abort;
+sctp_state_fn_t sctp_sf_shutdown_sent_abort;
+sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
+sctp_state_fn_t sctp_sf_do_5_1B_init;
+sctp_state_fn_t sctp_sf_do_5_1C_ack;
+sctp_state_fn_t sctp_sf_do_5_1D_ce;
+sctp_state_fn_t sctp_sf_do_5_1E_ca;
+sctp_state_fn_t sctp_sf_do_4_C;
+sctp_state_fn_t sctp_sf_eat_data_6_2;
+sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
+sctp_state_fn_t sctp_sf_eat_sack_6_2;
+sctp_state_fn_t sctp_sf_operr_notify;
+sctp_state_fn_t sctp_sf_t1_init_timer_expire;
+sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
+sctp_state_fn_t sctp_sf_t2_timer_expire;
+sctp_state_fn_t sctp_sf_t4_timer_expire;
+sctp_state_fn_t sctp_sf_t5_timer_expire;
+sctp_state_fn_t sctp_sf_sendbeat_8_3;
+sctp_state_fn_t sctp_sf_beat_8_3;
+sctp_state_fn_t sctp_sf_backbeat_8_3;
+sctp_state_fn_t sctp_sf_do_9_2_final;
+sctp_state_fn_t sctp_sf_do_9_2_shutdown;
+sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn;
+sctp_state_fn_t sctp_sf_do_ecn_cwr;
+sctp_state_fn_t sctp_sf_do_ecne;
+sctp_state_fn_t sctp_sf_ootb;
+sctp_state_fn_t sctp_sf_pdiscard;
+sctp_state_fn_t sctp_sf_violation;
+sctp_state_fn_t sctp_sf_discard_chunk;
+sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
+sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
+sctp_state_fn_t sctp_sf_do_5_2_3_initack;
+sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
+sctp_state_fn_t sctp_sf_unk_chunk;
+sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
+sctp_state_fn_t sctp_sf_cookie_echoed_err;
+sctp_state_fn_t sctp_sf_do_asconf;
+sctp_state_fn_t sctp_sf_do_asconf_ack;
+sctp_state_fn_t sctp_sf_do_9_2_reshutack;
+sctp_state_fn_t sctp_sf_eat_fwd_tsn;
+sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
+sctp_state_fn_t sctp_sf_eat_auth;
+
+/* Prototypes for primitive event state functions.  */
+sctp_state_fn_t sctp_sf_do_prm_asoc;
+sctp_state_fn_t sctp_sf_do_prm_send;
+sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
+sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
+sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
+sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
+sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
+sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
+sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
+sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
+sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
+sctp_state_fn_t sctp_sf_error_closed;
+sctp_state_fn_t sctp_sf_error_shutdown;
+sctp_state_fn_t sctp_sf_ignore_primitive;
+sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
+sctp_state_fn_t sctp_sf_do_prm_asconf;
+
+/* Prototypes for other event state functions.  */
+sctp_state_fn_t sctp_sf_do_no_pending_tsn;
+sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
+sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
+sctp_state_fn_t sctp_sf_ignore_other;
+sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
+
+/* Prototypes for timeout event state functions.  */
+sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
+sctp_state_fn_t sctp_sf_do_6_2_sack;
+sctp_state_fn_t sctp_sf_autoclose_timer_expire;
+
+/* Prototypes for utility support functions.  */
+__u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
+const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t,
+					    sctp_state_t,
+					    sctp_subtype_t);
+int sctp_chunk_iif(const struct sctp_chunk *);
+struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
+					     struct sctp_chunk *,
+					     gfp_t gfp);
+__u32 sctp_generate_verification_tag(void);
+void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
+
+/* Prototypes for chunk-building functions.  */
+struct sctp_chunk *sctp_make_init(const struct sctp_association *,
+			     const struct sctp_bind_addr *,
+			     gfp_t gfp, int vparam_len);
+struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *,
+				 const struct sctp_chunk *,
+				 const gfp_t gfp,
+				 const int unkparam_len);
+struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *,
+				    const struct sctp_chunk *);
+struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *,
+				   const struct sctp_chunk *);
+struct sctp_chunk *sctp_make_cwr(const struct sctp_association *,
+				 const __u32 lowest_tsn,
+				 const struct sctp_chunk *);
+struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *,
+					const struct sctp_sndrcvinfo *sinfo,
+					int len, const __u8 flags,
+					__u16 ssn);
+struct sctp_chunk *sctp_make_ecne(const struct sctp_association *,
+				  const __u32);
+struct sctp_chunk *sctp_make_sack(const struct sctp_association *);
+struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
+				      const struct sctp_chunk *chunk);
+struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
+					  const struct sctp_chunk *);
+struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *,
+					  const struct sctp_chunk *);
+void sctp_init_cause(struct sctp_chunk *, __be16 cause, size_t);
+struct sctp_chunk *sctp_make_abort(const struct sctp_association *,
+			      const struct sctp_chunk *,
+			      const size_t hint);
+struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *,
+				      const struct sctp_chunk *,
+				      __u32 tsn);
+struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *,
+					const struct msghdr *, size_t msg_len);
+struct sctp_chunk *sctp_make_abort_violation(const struct sctp_association *,
+				   const struct sctp_chunk *,
+				   const __u8 *,
+				   const size_t );
+struct sctp_chunk *sctp_make_violation_paramlen(const struct sctp_association *,
+				   const struct sctp_chunk *,
+				   struct sctp_paramhdr *);
+struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *,
+				  const struct sctp_transport *);
+struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *,
+				      const struct sctp_chunk *,
+				      const void *payload,
+				      const size_t paylen);
+struct sctp_chunk *sctp_make_op_error(const struct sctp_association *,
+				 const struct sctp_chunk *chunk,
+				 __be16 cause_code,
+				 const void *payload,
+				 size_t paylen,
+				 size_t reserve_tail);
+
+struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *,
+					      union sctp_addr *,
+					      struct sockaddr *,
+					      int, __be16);
+struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
+					     union sctp_addr *addr);
+int sctp_verify_asconf(const struct sctp_association *asoc,
+		       struct sctp_paramhdr *param_hdr, void *chunk_end,
+		       struct sctp_paramhdr **errp);
+struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
+				       struct sctp_chunk *asconf);
+int sctp_process_asconf_ack(struct sctp_association *asoc,
+			    struct sctp_chunk *asconf_ack);
+struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
+				    __u32 new_cum_tsn, size_t nstreams,
+				    struct sctp_fwdtsn_skip *skiplist);
+struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc);
+
+void sctp_chunk_assign_tsn(struct sctp_chunk *);
+void sctp_chunk_assign_ssn(struct sctp_chunk *);
+
+/* Prototypes for statetable processing. */
+
+int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
+	       sctp_state_t state,
+               struct sctp_endpoint *,
+               struct sctp_association *asoc,
+               void *event_arg,
+	       gfp_t gfp);
+
+/* 2nd level prototypes */
+void sctp_generate_t3_rtx_event(unsigned long peer);
+void sctp_generate_heartbeat_event(unsigned long peer);
+void sctp_generate_proto_unreach_event(unsigned long peer);
+
+void sctp_ootb_pkt_free(struct sctp_packet *);
+
+struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *,
+				       const struct sctp_association *,
+				       struct sctp_chunk *,
+				       gfp_t gfp, int *err,
+				       struct sctp_chunk **err_chk_p);
+int sctp_addip_addr_config(struct sctp_association *, sctp_param_t,
+			   struct sockaddr_storage*, int);
+
+/* 3rd level prototypes */
+__u32 sctp_generate_tag(const struct sctp_endpoint *);
+__u32 sctp_generate_tsn(const struct sctp_endpoint *);
+
+/* Extern declarations for major data structures.  */
+extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
+
+
+/* Get the size of a DATA chunk payload. */
+static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
+{
+	__u16 size;
+
+	size = ntohs(chunk->chunk_hdr->length);
+	size -= sizeof(sctp_data_chunk_t);
+
+	return size;
+}
+
+/* Compare two TSNs */
+
+/* RFC 1982 - Serial Number Arithmetic
+ *
+ * 2. Comparison
+ *  Then, s1 is said to be equal to s2 if and only if i1 is equal to i2,
+ *  in all other cases, s1 is not equal to s2.
+ *
+ * s1 is said to be less than s2 if, and only if, s1 is not equal to s2,
+ * and
+ *
+ *      (i1 < i2 and i2 - i1 < 2^(SERIAL_BITS - 1)) or
+ *      (i1 > i2 and i1 - i2 > 2^(SERIAL_BITS - 1))
+ *
+ * s1 is said to be greater than s2 if, and only if, s1 is not equal to
+ * s2, and
+ *
+ *      (i1 < i2 and i2 - i1 > 2^(SERIAL_BITS - 1)) or
+ *      (i1 > i2 and i1 - i2 < 2^(SERIAL_BITS - 1))
+ */
+
+/*
+ * RFC 2960
+ *  1.6 Serial Number Arithmetic
+ *
+ * Comparisons and arithmetic on TSNs in this document SHOULD use Serial
+ * Number Arithmetic as defined in [RFC1982] where SERIAL_BITS = 32.
+ */
+
+enum {
+	TSN_SIGN_BIT = (1<<31)
+};
+
+static inline int TSN_lt(__u32 s, __u32 t)
+{
+	return ((s) - (t)) & TSN_SIGN_BIT;
+}
+
+static inline int TSN_lte(__u32 s, __u32 t)
+{
+	return ((s) == (t)) || (((s) - (t)) & TSN_SIGN_BIT);
+}
+
+/* Compare two SSNs */
+
+/*
+ * RFC 2960
+ *  1.6 Serial Number Arithmetic
+ *
+ * Comparisons and arithmetic on Stream Sequence Numbers in this document
+ * SHOULD use Serial Number Arithmetic as defined in [RFC1982] where
+ * SERIAL_BITS = 16.
+ */
+enum {
+	SSN_SIGN_BIT = (1<<15)
+};
+
+static inline int SSN_lt(__u16 s, __u16 t)
+{
+	return ((s) - (t)) & SSN_SIGN_BIT;
+}
+
+static inline int SSN_lte(__u16 s, __u16 t)
+{
+	return ((s) == (t)) || (((s) - (t)) & SSN_SIGN_BIT);
+}
+
+/*
+ * ADDIP 3.1.1
+ * The valid range of Serial Number is from 0 to 4294967295 (2**32 - 1). Serial
+ * Numbers wrap back to 0 after reaching 4294967295.
+ */
+enum {
+	ADDIP_SERIAL_SIGN_BIT = (1<<31)
+};
+
+static inline int ADDIP_SERIAL_gte(__u16 s, __u16 t)
+{
+	return ((s) == (t)) || (((t) - (s)) & ADDIP_SERIAL_SIGN_BIT);
+}
+
+/* Check VTAG of the packet matches the sender's own tag. */
+static inline int
+sctp_vtag_verify(const struct sctp_chunk *chunk,
+		 const struct sctp_association *asoc)
+{
+	/* RFC 2960 Sec 8.5 When receiving an SCTP packet, the endpoint
+	 * MUST ensure that the value in the Verification Tag field of
+	 * the received SCTP packet matches its own Tag. If the received
+	 * Verification Tag value does not match the receiver's own
+	 * tag value, the receiver shall silently discard the packet...
+	 */
+        if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)
+                return 1;
+
+	return 0;
+}
+
+/* Check VTAG of the packet matches the sender's own tag and the T bit is
+ * not set, OR its peer's tag and the T bit is set in the Chunk Flags.
+ */
+static inline int
+sctp_vtag_verify_either(const struct sctp_chunk *chunk,
+			const struct sctp_association *asoc)
+{
+        /* RFC 2960 Section 8.5.1, sctpimpguide Section 2.41
+	 *
+	 * B) The receiver of a ABORT MUST accept the packet
+	 *    if the Verification Tag field of the packet matches its own tag
+	 *    and the T bit is not set
+	 *    OR
+	 *    it is set to its peer's tag and the T bit is set in the Chunk
+	 *    Flags.
+	 *    Otherwise, the receiver MUST silently discard the packet
+	 *    and take no further action.
+	 *
+	 * C) The receiver of a SHUTDOWN COMPLETE shall accept the packet
+	 *    if the Verification Tag field of the packet matches its own tag
+	 *    and the T bit is not set
+	 *    OR
+	 *    it is set to its peer's tag and the T bit is set in the Chunk
+	 *    Flags.
+	 *    Otherwise, the receiver MUST silently discard the packet
+	 *    and take no further action.  An endpoint MUST ignore the
+	 *    SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state.
+	 */
+        if ((!sctp_test_T_bit(chunk) &&
+             (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)) ||
+	    (sctp_test_T_bit(chunk) && asoc->c.peer_vtag &&
+	     (ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
+                return 1;
+	}
+
+	return 0;
+}
+
+#endif /* __sctp_sm_h__ */
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
new file mode 100644
index 00000000..88949a99
--- /dev/null
+++ b/include/net/sctp/structs.h
@@ -0,0 +1,2037 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *		   ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresses:
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *    Randall Stewart	    <randall@sctp.chicago.il.us>
+ *    Ken Morneau	    <kmorneau@cisco.com>
+ *    Qiaobing Xie	    <qxie1@email.mot.com>
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Karl Knutson	    <karl@athena.chicago.il.us>
+ *    Jon Grimm		    <jgrimm@us.ibm.com>
+ *    Xingang Guo	    <xingang.guo@intel.com>
+ *    Hui Huang		    <hui.huang@nokia.com>
+ *    Sridhar Samudrala	    <sri@us.ibm.com>
+ *    Daisy Chang	    <daisyc@us.ibm.com>
+ *    Dajiang Zhang	    <dajiang.zhang@nokia.com>
+ *    Ardelle Fan	    <ardelle.fan@intel.com>
+ *    Ryan Layer	    <rmlayer@us.ibm.com>
+ *    Anup Pemmaiah	    <pemmaiah@cc.usu.edu>
+ *    Kevin Gao             <kevin.gao@intel.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#ifndef __sctp_structs_h__
+#define __sctp_structs_h__
+
+#include <linux/time.h>		/* We get struct timespec.    */
+#include <linux/socket.h>	/* linux/in.h needs this!!    */
+#include <linux/in.h>		/* We get struct sockaddr_in. */
+#include <linux/in6.h>		/* We get struct in6_addr     */
+#include <linux/ipv6.h>
+#include <asm/param.h>		/* We get MAXHOSTNAMELEN.     */
+#include <linux/atomic.h>		/* This gets us atomic counters.  */
+#include <linux/skbuff.h>	/* We need sk_buff_head. */
+#include <linux/workqueue.h>	/* We need tq_struct.	 */
+#include <linux/sctp.h>		/* We need sctp* header structs.  */
+#include <net/sctp/auth.h>	/* We need auth specific structs */
+
+/* A convenience structure for handling sockaddr structures.
+ * We should wean ourselves off this.
+ */
+union sctp_addr {
+	struct sockaddr_in v4;
+	struct sockaddr_in6 v6;
+	struct sockaddr sa;
+};
+
+/* Forward declarations for data structures. */
+struct sctp_globals;
+struct sctp_endpoint;
+struct sctp_association;
+struct sctp_transport;
+struct sctp_packet;
+struct sctp_chunk;
+struct sctp_inq;
+struct sctp_outq;
+struct sctp_bind_addr;
+struct sctp_ulpq;
+struct sctp_ep_common;
+struct sctp_ssnmap;
+struct crypto_hash;
+
+
+#include <net/sctp/tsnmap.h>
+#include <net/sctp/ulpevent.h>
+#include <net/sctp/ulpqueue.h>
+
+/* Structures useful for managing bind/connect. */
+
+struct sctp_bind_bucket {
+	unsigned short	port;
+	unsigned short	fastreuse;
+	struct hlist_node	node;
+	struct hlist_head	owner;
+};
+
+struct sctp_bind_hashbucket {
+	spinlock_t	lock;
+	struct hlist_head	chain;
+};
+
+/* Used for hashing all associations.  */
+struct sctp_hashbucket {
+	rwlock_t	lock;
+	struct hlist_head	chain;
+} __attribute__((__aligned__(8)));
+
+
+/* The SCTP globals structure. */
+extern struct sctp_globals {
+	/* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values
+	 *
+	 * The following protocol parameters are RECOMMENDED:
+	 *
+	 * RTO.Initial		    - 3	 seconds
+	 * RTO.Min		    - 1	 second
+	 * RTO.Max		   -  60 seconds
+	 * RTO.Alpha		    - 1/8  (3 when converted to right shifts.)
+	 * RTO.Beta		    - 1/4  (2 when converted to right shifts.)
+	 */
+	unsigned int rto_initial;
+	unsigned int rto_min;
+	unsigned int rto_max;
+
+	/* Note: rto_alpha and rto_beta are really defined as inverse
+	 * powers of two to facilitate integer operations.
+	 */
+	int rto_alpha;
+	int rto_beta;
+
+	/* Max.Burst		    - 4 */
+	int max_burst;
+
+	/* Whether Cookie Preservative is enabled(1) or not(0) */
+	int cookie_preserve_enable;
+
+	/* Valid.Cookie.Life	    - 60  seconds  */
+	unsigned int valid_cookie_life;
+
+	/* Delayed SACK timeout  200ms default*/
+	unsigned int sack_timeout;
+
+	/* HB.interval		    - 30 seconds  */
+	unsigned int hb_interval;
+
+	/* Association.Max.Retrans  - 10 attempts
+	 * Path.Max.Retrans	    - 5	 attempts (per destination address)
+	 * Max.Init.Retransmits	    - 8	 attempts
+	 */
+	int max_retrans_association;
+	int max_retrans_path;
+	int max_retrans_init;
+
+	/*
+	 * Policy for preforming sctp/socket accounting
+	 * 0   - do socket level accounting, all assocs share sk_sndbuf
+	 * 1   - do sctp accounting, each asoc may use sk_sndbuf bytes
+	 */
+	int sndbuf_policy;
+
+	/*
+	 * Policy for preforming sctp/socket accounting
+	 * 0   - do socket level accounting, all assocs share sk_rcvbuf
+	 * 1   - do sctp accounting, each asoc may use sk_rcvbuf bytes
+	 */
+	int rcvbuf_policy;
+
+	/* The following variables are implementation specific.	 */
+
+	/* Default initialization values to be applied to new associations. */
+	__u16 max_instreams;
+	__u16 max_outstreams;
+
+	/* This is a list of groups of functions for each address
+	 * family that we support.
+	 */
+	struct list_head address_families;
+
+	/* This is the hash of all endpoints. */
+	int ep_hashsize;
+	struct sctp_hashbucket *ep_hashtable;
+
+	/* This is the hash of all associations. */
+	int assoc_hashsize;
+	struct sctp_hashbucket *assoc_hashtable;
+
+	/* This is the sctp port control hash.	*/
+	int port_hashsize;
+	struct sctp_bind_hashbucket *port_hashtable;
+
+	/* This is the global local address list.
+	 * We actively maintain this complete list of addresses on
+	 * the system by catching address add/delete events.
+	 *
+	 * It is a list of sctp_sockaddr_entry.
+	 */
+	struct list_head local_addr_list;
+	int default_auto_asconf;
+	struct list_head addr_waitq;
+	struct timer_list addr_wq_timer;
+	struct list_head auto_asconf_splist;
+	spinlock_t addr_wq_lock;
+
+	/* Lock that protects the local_addr_list writers */
+	spinlock_t addr_list_lock;
+	
+	/* Flag to indicate if addip is enabled. */
+	int addip_enable;
+	int addip_noauth_enable;
+
+	/* Flag to indicate if PR-SCTP is enabled. */
+	int prsctp_enable;
+
+	/* Flag to idicate if SCTP-AUTH is enabled */
+	int auth_enable;
+
+	/*
+	 * Policy to control SCTP IPv4 address scoping
+	 * 0   - Disable IPv4 address scoping
+	 * 1   - Enable IPv4 address scoping
+	 * 2   - Selectively allow only IPv4 private addresses
+	 * 3   - Selectively allow only IPv4 link local address
+	 */
+	int ipv4_scope_policy;
+
+	/* Flag to indicate whether computing and verifying checksum
+	 * is disabled. */
+        bool checksum_disable;
+
+	/* Threshold for rwnd update SACKS.  Receive buffer shifted this many
+	 * bits is an indicator of when to send and window update SACK.
+	 */
+	int rwnd_update_shift;
+
+	/* Threshold for autoclose timeout, in seconds. */
+	unsigned long max_autoclose;
+} sctp_globals;
+
+#define sctp_rto_initial		(sctp_globals.rto_initial)
+#define sctp_rto_min			(sctp_globals.rto_min)
+#define sctp_rto_max			(sctp_globals.rto_max)
+#define sctp_rto_alpha			(sctp_globals.rto_alpha)
+#define sctp_rto_beta			(sctp_globals.rto_beta)
+#define sctp_max_burst			(sctp_globals.max_burst)
+#define sctp_valid_cookie_life		(sctp_globals.valid_cookie_life)
+#define sctp_cookie_preserve_enable	(sctp_globals.cookie_preserve_enable)
+#define sctp_max_retrans_association	(sctp_globals.max_retrans_association)
+#define sctp_sndbuf_policy	 	(sctp_globals.sndbuf_policy)
+#define sctp_rcvbuf_policy	 	(sctp_globals.rcvbuf_policy)
+#define sctp_max_retrans_path		(sctp_globals.max_retrans_path)
+#define sctp_max_retrans_init		(sctp_globals.max_retrans_init)
+#define sctp_sack_timeout		(sctp_globals.sack_timeout)
+#define sctp_hb_interval		(sctp_globals.hb_interval)
+#define sctp_max_instreams		(sctp_globals.max_instreams)
+#define sctp_max_outstreams		(sctp_globals.max_outstreams)
+#define sctp_address_families		(sctp_globals.address_families)
+#define sctp_ep_hashsize		(sctp_globals.ep_hashsize)
+#define sctp_ep_hashtable		(sctp_globals.ep_hashtable)
+#define sctp_assoc_hashsize		(sctp_globals.assoc_hashsize)
+#define sctp_assoc_hashtable		(sctp_globals.assoc_hashtable)
+#define sctp_port_hashsize		(sctp_globals.port_hashsize)
+#define sctp_port_hashtable		(sctp_globals.port_hashtable)
+#define sctp_local_addr_list		(sctp_globals.local_addr_list)
+#define sctp_local_addr_lock		(sctp_globals.addr_list_lock)
+#define sctp_auto_asconf_splist		(sctp_globals.auto_asconf_splist)
+#define sctp_addr_waitq			(sctp_globals.addr_waitq)
+#define sctp_addr_wq_timer		(sctp_globals.addr_wq_timer)
+#define sctp_addr_wq_lock		(sctp_globals.addr_wq_lock)
+#define sctp_default_auto_asconf	(sctp_globals.default_auto_asconf)
+#define sctp_scope_policy		(sctp_globals.ipv4_scope_policy)
+#define sctp_addip_enable		(sctp_globals.addip_enable)
+#define sctp_addip_noauth		(sctp_globals.addip_noauth_enable)
+#define sctp_prsctp_enable		(sctp_globals.prsctp_enable)
+#define sctp_auth_enable		(sctp_globals.auth_enable)
+#define sctp_checksum_disable		(sctp_globals.checksum_disable)
+#define sctp_rwnd_upd_shift		(sctp_globals.rwnd_update_shift)
+#define sctp_max_autoclose		(sctp_globals.max_autoclose)
+
+/* SCTP Socket type: UDP or TCP style. */
+typedef enum {
+	SCTP_SOCKET_UDP = 0,
+	SCTP_SOCKET_UDP_HIGH_BANDWIDTH,
+	SCTP_SOCKET_TCP
+} sctp_socket_type_t;
+
+/* Per socket SCTP information. */
+struct sctp_sock {
+	/* inet_sock has to be the first member of sctp_sock */
+	struct inet_sock inet;
+	/* What kind of a socket is this? */
+	sctp_socket_type_t type;
+
+	/* PF_ family specific functions.  */
+	struct sctp_pf *pf;
+
+	/* Access to HMAC transform. */
+	struct crypto_hash *hmac;
+
+	/* What is our base endpointer? */
+	struct sctp_endpoint *ep;
+
+	struct sctp_bind_bucket *bind_hash;
+	/* Various Socket Options.  */
+	__u16 default_stream;
+	__u32 default_ppid;
+	__u16 default_flags;
+	__u32 default_context;
+	__u32 default_timetolive;
+	__u32 default_rcv_context;
+	int max_burst;
+
+	/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
+	 * the destination address every heartbeat interval. This value
+	 * will be inherited by all new associations.
+	 */
+	__u32 hbinterval;
+
+	/* This is the max_retrans value for new associations. */
+	__u16 pathmaxrxt;
+
+	/* The initial Path MTU to use for new associations. */
+	__u32 pathmtu;
+
+	/* The default SACK delay timeout for new associations. */
+	__u32 sackdelay;
+	__u32 sackfreq;
+
+	/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
+	__u32 param_flags;
+
+	struct sctp_initmsg initmsg;
+	struct sctp_rtoinfo rtoinfo;
+	struct sctp_paddrparams paddrparam;
+	struct sctp_event_subscribe subscribe;
+	struct sctp_assocparams assocparams;
+	int user_frag;
+	__u32 autoclose;
+	__u8 nodelay;
+	__u8 disable_fragments;
+	__u8 v4mapped;
+	__u8 frag_interleave;
+	__u32 adaptation_ind;
+	__u32 pd_point;
+
+	atomic_t pd_mode;
+	/* Receive to here while partial delivery is in effect. */
+	struct sk_buff_head pd_lobby;
+	struct list_head auto_asconf_list;
+	int do_auto_asconf;
+};
+
+static inline struct sctp_sock *sctp_sk(const struct sock *sk)
+{
+       return (struct sctp_sock *)sk;
+}
+
+static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)
+{
+       return (struct sock *)sp;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+struct sctp6_sock {
+       struct sctp_sock  sctp;
+       struct ipv6_pinfo inet6;
+};
+#endif /* CONFIG_IPV6 */
+
+
+/* This is our APPLICATION-SPECIFIC state cookie.
+ * THIS IS NOT DICTATED BY THE SPECIFICATION.
+ */
+/* These are the parts of an association which we send in the cookie.
+ * Most of these are straight out of:
+ * RFC2960 12.2 Parameters necessary per association (i.e. the TCB)
+ *
+ */
+
+struct sctp_cookie {
+
+	/* My	       : Tag expected in every inbound packet and sent
+	 * Verification: in the INIT or INIT ACK chunk.
+	 * Tag	       :
+	 */
+	__u32 my_vtag;
+
+	/* Peer's      : Tag expected in every outbound packet except
+	 * Verification: in the INIT chunk.
+	 * Tag	       :
+	 */
+	__u32 peer_vtag;
+
+	/* The rest of these are not from the spec, but really need to
+	 * be in the cookie.
+	 */
+
+	/* My Tie Tag  : Assist in discovering a restarting association. */
+	__u32 my_ttag;
+
+	/* Peer's Tie Tag: Assist in discovering a restarting association. */
+	__u32 peer_ttag;
+
+	/* When does this cookie expire? */
+	struct timeval expiration;
+
+	/* Number of inbound/outbound streams which are set
+	 * and negotiated during the INIT process.
+	 */
+	__u16 sinit_num_ostreams;
+	__u16 sinit_max_instreams;
+
+	/* This is the first sequence number I used.  */
+	__u32 initial_tsn;
+
+	/* This holds the originating address of the INIT packet.  */
+	union sctp_addr peer_addr;
+
+	/* IG Section 2.35.3 
+	 * Include the source port of the INIT-ACK
+	 */
+	__u16		my_port;
+
+	__u8 prsctp_capable;
+
+	/* Padding for future use */
+	__u8 padding;  		
+
+	__u32 adaptation_ind;
+
+	__u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
+	__u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2];
+	__u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
+
+	/* This is a shim for my peer's INIT packet, followed by
+	 * a copy of the raw address list of the association.
+	 * The length of the raw address list is saved in the
+	 * raw_addr_list_len field, which will be used at the time when
+	 * the association TCB is re-constructed from the cookie.
+	 */
+	__u32 raw_addr_list_len;
+	struct sctp_init_chunk peer_init[0];
+};
+
+
+/* The format of our cookie that we send to our peer. */
+struct sctp_signed_cookie {
+	__u8 signature[SCTP_SECRET_SIZE];
+	__u32 __pad;		/* force sctp_cookie alignment to 64 bits */
+	struct sctp_cookie c;
+} __packed;
+
+/* This is another convenience type to allocate memory for address
+ * params for the maximum size and pass such structures around
+ * internally.
+ */
+union sctp_addr_param {
+	struct sctp_paramhdr p;
+	struct sctp_ipv4addr_param v4;
+	struct sctp_ipv6addr_param v6;
+};
+
+/* A convenience type to allow walking through the various
+ * parameters and avoid casting all over the place.
+ */
+union sctp_params {
+	void *v;
+	struct sctp_paramhdr *p;
+	struct sctp_cookie_preserve_param *life;
+	struct sctp_hostname_param *dns;
+	struct sctp_cookie_param *cookie;
+	struct sctp_supported_addrs_param *sat;
+	struct sctp_ipv4addr_param *v4;
+	struct sctp_ipv6addr_param *v6;
+	union sctp_addr_param *addr;
+	struct sctp_adaptation_ind_param *aind;
+	struct sctp_supported_ext_param *ext;
+	struct sctp_random_param *random;
+	struct sctp_chunks_param *chunks;
+	struct sctp_hmac_algo_param *hmac_algo;
+	struct sctp_addip_param *addip;
+};
+
+/* RFC 2960.  Section 3.3.5 Heartbeat.
+ *    Heartbeat Information: variable length
+ *    The Sender-specific Heartbeat Info field should normally include
+ *    information about the sender's current time when this HEARTBEAT
+ *    chunk is sent and the destination transport address to which this
+ *    HEARTBEAT is sent (see Section 8.3).
+ */
+typedef struct sctp_sender_hb_info {
+	struct sctp_paramhdr param_hdr;
+	union sctp_addr daddr;
+	unsigned long sent_at;
+	__u64 hb_nonce;
+} __packed sctp_sender_hb_info_t;
+
+/*
+ *  RFC 2960 1.3.2 Sequenced Delivery within Streams
+ *
+ *  The term "stream" is used in SCTP to refer to a sequence of user
+ *  messages that are to be delivered to the upper-layer protocol in
+ *  order with respect to other messages within the same stream.  This is
+ *  in contrast to its usage in TCP, where it refers to a sequence of
+ *  bytes (in this document a byte is assumed to be eight bits).
+ *  ...
+ *
+ *  This is the structure we use to track both our outbound and inbound
+ *  SSN, or Stream Sequence Numbers.
+ */
+
+struct sctp_stream {
+	__u16 *ssn;
+	unsigned int len;
+};
+
+struct sctp_ssnmap {
+	struct sctp_stream in;
+	struct sctp_stream out;
+	int malloced;
+};
+
+struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out,
+				    gfp_t gfp);
+void sctp_ssnmap_free(struct sctp_ssnmap *map);
+void sctp_ssnmap_clear(struct sctp_ssnmap *map);
+
+/* What is the current SSN number for this stream? */
+static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id)
+{
+	return stream->ssn[id];
+}
+
+/* Return the next SSN number for this stream.	*/
+static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id)
+{
+	return stream->ssn[id]++;
+}
+
+/* Skip over this ssn and all below. */
+static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 
+				 __u16 ssn)
+{
+	stream->ssn[id] = ssn+1;
+}
+              
+/*
+ * Pointers to address related SCTP functions.
+ * (i.e. things that depend on the address family.)
+ */
+struct sctp_af {
+	int		(*sctp_xmit)	(struct sk_buff *skb,
+					 struct sctp_transport *);
+	int		(*setsockopt)	(struct sock *sk,
+					 int level,
+					 int optname,
+					 char __user *optval,
+					 unsigned int optlen);
+	int		(*getsockopt)	(struct sock *sk,
+					 int level,
+					 int optname,
+					 char __user *optval,
+					 int __user *optlen);
+	int		(*compat_setsockopt)	(struct sock *sk,
+					 int level,
+					 int optname,
+					 char __user *optval,
+					 unsigned int optlen);
+	int		(*compat_getsockopt)	(struct sock *sk,
+					 int level,
+					 int optname,
+					 char __user *optval,
+					 int __user *optlen);
+	void		(*get_dst)	(struct sctp_transport *t,
+					 union sctp_addr *saddr,
+					 struct flowi *fl,
+					 struct sock *sk);
+	void		(*get_saddr)	(struct sctp_sock *sk,
+					 struct sctp_transport *t,
+					 struct flowi *fl);
+	void		(*copy_addrlist) (struct list_head *,
+					  struct net_device *);
+	int		(*cmp_addr)	(const union sctp_addr *addr1,
+					 const union sctp_addr *addr2);
+	void		(*addr_copy)	(union sctp_addr *dst,
+					 union sctp_addr *src);
+	void		(*from_skb)	(union sctp_addr *,
+					 struct sk_buff *skb,
+					 int saddr);
+	void		(*from_sk)	(union sctp_addr *,
+					 struct sock *sk);
+	void		(*to_sk_saddr)	(union sctp_addr *,
+					 struct sock *sk);
+	void		(*to_sk_daddr)	(union sctp_addr *,
+					 struct sock *sk);
+	void		(*from_addr_param) (union sctp_addr *,
+					    union sctp_addr_param *,
+					    __be16 port, int iif);
+	int		(*to_addr_param) (const union sctp_addr *,
+					  union sctp_addr_param *); 
+	int		(*addr_valid)	(union sctp_addr *,
+					 struct sctp_sock *,
+					 const struct sk_buff *);
+	sctp_scope_t	(*scope) (union sctp_addr *);
+	void		(*inaddr_any)	(union sctp_addr *, __be16);
+	int		(*is_any)	(const union sctp_addr *);
+	int		(*available)	(union sctp_addr *,
+					 struct sctp_sock *);
+	int		(*skb_iif)	(const struct sk_buff *sk);
+	int		(*is_ce)	(const struct sk_buff *sk);
+	void		(*seq_dump_addr)(struct seq_file *seq,
+					 union sctp_addr *addr);
+	void		(*ecn_capable)(struct sock *sk);
+	__u16		net_header_len;
+	int		sockaddr_len;
+	sa_family_t	sa_family;
+	struct list_head list;
+};
+
+struct sctp_af *sctp_get_af_specific(sa_family_t);
+int sctp_register_af(struct sctp_af *);
+
+/* Protocol family functions. */
+struct sctp_pf {
+	void (*event_msgname)(struct sctp_ulpevent *, char *, int *);
+	void (*skb_msgname)  (struct sk_buff *, char *, int *);
+	int  (*af_supported) (sa_family_t, struct sctp_sock *);
+	int  (*cmp_addr) (const union sctp_addr *,
+			  const union sctp_addr *,
+			  struct sctp_sock *);
+	int  (*bind_verify) (struct sctp_sock *, union sctp_addr *);
+	int  (*send_verify) (struct sctp_sock *, union sctp_addr *);
+	int  (*supported_addrs)(const struct sctp_sock *, __be16 *);
+	struct sock *(*create_accept_sk) (struct sock *sk,
+					  struct sctp_association *asoc);
+	void (*addr_v4map) (struct sctp_sock *, union sctp_addr *);
+	struct sctp_af *af;
+};
+
+
+/* Structure to track chunk fragments that have been acked, but peer
+ * fragments of the same message have not.
+ */
+struct sctp_datamsg {
+	/* Chunks waiting to be submitted to lower layer. */
+	struct list_head chunks;
+	/* Reference counting. */
+	atomic_t refcnt;
+	/* When is this message no longer interesting to the peer? */
+	unsigned long expires_at;
+	/* Did the messenge fail to send? */
+	int send_error;
+	u8 send_failed:1,
+	   can_abandon:1,   /* can chunks from this message can be abandoned. */
+	   can_delay;	    /* should this message be Nagle delayed */
+};
+
+struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
+					    struct sctp_sndrcvinfo *,
+					    struct msghdr *, int len);
+void sctp_datamsg_free(struct sctp_datamsg *);
+void sctp_datamsg_put(struct sctp_datamsg *);
+void sctp_chunk_fail(struct sctp_chunk *, int error);
+int sctp_chunk_abandoned(struct sctp_chunk *);
+
+/* RFC2960 1.4 Key Terms
+ *
+ * o Chunk: A unit of information within an SCTP packet, consisting of
+ * a chunk header and chunk-specific content.
+ *
+ * As a matter of convenience, we remember the SCTP common header for
+ * each chunk as well as a few other header pointers...
+ */
+struct sctp_chunk {
+	struct list_head list;
+
+	atomic_t refcnt;
+
+	/* This is our link to the per-transport transmitted list.  */
+	struct list_head transmitted_list;
+
+	/* This field is used by chunks that hold fragmented data.
+	 * For the first fragment this is the list that holds the rest of
+	 * fragments. For the remaining fragments, this is the link to the
+	 * frag_list maintained in the first fragment.
+	 */
+	struct list_head frag_list;
+
+	/* This points to the sk_buff containing the actual data.  */
+	struct sk_buff *skb;
+
+	/* These are the SCTP headers by reverse order in a packet.
+	 * Note that some of these may happen more than once.  In that
+	 * case, we point at the "current" one, whatever that means
+	 * for that level of header.
+	 */
+
+	/* We point this at the FIRST TLV parameter to chunk_hdr.  */
+	union sctp_params param_hdr;
+	union {
+		__u8 *v;
+		struct sctp_datahdr *data_hdr;
+		struct sctp_inithdr *init_hdr;
+		struct sctp_sackhdr *sack_hdr;
+		struct sctp_heartbeathdr *hb_hdr;
+		struct sctp_sender_hb_info *hbs_hdr;
+		struct sctp_shutdownhdr *shutdown_hdr;
+		struct sctp_signed_cookie *cookie_hdr;
+		struct sctp_ecnehdr *ecne_hdr;
+		struct sctp_cwrhdr *ecn_cwr_hdr;
+		struct sctp_errhdr *err_hdr;
+		struct sctp_addiphdr *addip_hdr;
+		struct sctp_fwdtsn_hdr *fwdtsn_hdr;
+		struct sctp_authhdr *auth_hdr;
+	} subh;
+
+	__u8 *chunk_end;
+
+	struct sctp_chunkhdr *chunk_hdr;
+	struct sctphdr *sctp_hdr;
+
+	/* This needs to be recoverable for SCTP_SEND_FAILED events. */
+	struct sctp_sndrcvinfo sinfo;
+
+	/* Which association does this belong to?  */
+	struct sctp_association *asoc;
+
+	/* What endpoint received this chunk? */
+	struct sctp_ep_common *rcvr;
+
+	/* We fill this in if we are calculating RTT. */
+	unsigned long sent_at;
+
+	/* What is the origin IP address for this chunk?  */
+	union sctp_addr source;
+	/* Destination address for this chunk. */
+	union sctp_addr dest;
+
+	/* For outbound message, track all fragments for SEND_FAILED. */
+	struct sctp_datamsg *msg;
+
+	/* For an inbound chunk, this tells us where it came from.
+	 * For an outbound chunk, it tells us where we'd like it to
+	 * go.	It is NULL if we have no preference.
+	 */
+	struct sctp_transport *transport;
+
+	/* SCTP-AUTH:  For the special case inbound processing of COOKIE-ECHO
+	 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
+	 * spec violates the principle premis that all chunks are processed
+	 * in order.
+	 */
+	struct sk_buff *auth_chunk;
+
+#define SCTP_CAN_FRTX 0x0
+#define SCTP_NEED_FRTX 0x1
+#define SCTP_DONT_FRTX 0x2
+	__u16	rtt_in_progress:1,	/* This chunk used for RTT calc? */
+		has_tsn:1,		/* Does this chunk have a TSN yet? */
+		has_ssn:1,		/* Does this chunk have a SSN yet? */
+		singleton:1,		/* Only chunk in the packet? */
+		end_of_packet:1,	/* Last chunk in the packet? */
+		ecn_ce_done:1,		/* Have we processed the ECN CE bit? */
+		pdiscard:1,		/* Discard the whole packet now? */
+		tsn_gap_acked:1,	/* Is this chunk acked by a GAP ACK? */
+		data_accepted:1,	/* At least 1 chunk accepted */
+		auth:1,			/* IN: was auth'ed | OUT: needs auth */
+		has_asconf:1,		/* IN: have seen an asconf before */
+		tsn_missing_report:2,	/* Data chunk missing counter. */
+		fast_retransmit:2;	/* Is this chunk fast retransmitted? */
+};
+
+void sctp_chunk_hold(struct sctp_chunk *);
+void sctp_chunk_put(struct sctp_chunk *);
+int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
+			  struct iovec *data);
+void sctp_chunk_free(struct sctp_chunk *);
+void  *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
+void  *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, const void *data);
+struct sctp_chunk *sctp_chunkify(struct sk_buff *,
+				 const struct sctp_association *,
+				 struct sock *);
+void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *,
+		     union sctp_addr *);
+const union sctp_addr *sctp_source(const struct sctp_chunk *chunk);
+
+enum {
+	SCTP_ADDR_NEW,		/* new address added to assoc/ep */
+	SCTP_ADDR_SRC,		/* address can be used as source */
+	SCTP_ADDR_DEL,		/* address about to be deleted */
+};
+
+/* This is a structure for holding either an IPv6 or an IPv4 address.  */
+struct sctp_sockaddr_entry {
+	struct list_head list;
+	struct rcu_head	rcu;
+	union sctp_addr a;
+	__u8 state;
+	__u8 valid;
+};
+
+#define SCTP_ADDRESS_TICK_DELAY	500
+
+typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *);
+
+/* This structure holds lists of chunks as we are assembling for
+ * transmission.
+ */
+struct sctp_packet {
+	/* These are the SCTP header values (host order) for the packet. */
+	__u16 source_port;
+	__u16 destination_port;
+	__u32 vtag;
+
+	/* This contains the payload chunks.  */
+	struct list_head chunk_list;
+
+	/* This is the overhead of the sctp and ip headers. */
+	size_t overhead;
+	/* This is the total size of all chunks INCLUDING padding.  */
+	size_t size;
+
+	/* The packet is destined for this transport address.
+	 * The function we finally use to pass down to the next lower
+	 * layer lives in the transport structure.
+	 */
+	struct sctp_transport *transport;
+
+	/* pointer to the auth chunk for this packet */
+	struct sctp_chunk *auth;
+
+	u8  has_cookie_echo:1,	/* This packet contains a COOKIE-ECHO chunk. */
+	    has_sack:1,		/* This packet contains a SACK chunk. */
+	    has_auth:1,		/* This packet contains an AUTH chunk */
+	    has_data:1,		/* This packet contains at least 1 DATA chunk */
+	    ipfragok:1,		/* So let ip fragment this packet */
+	    malloced:1;		/* Is it malloced? */
+};
+
+struct sctp_packet *sctp_packet_init(struct sctp_packet *,
+				     struct sctp_transport *,
+				     __u16 sport, __u16 dport);
+struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int);
+sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *,
+                                       struct sctp_chunk *, int);
+sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *,
+                                     struct sctp_chunk *);
+int sctp_packet_transmit(struct sctp_packet *);
+void sctp_packet_free(struct sctp_packet *);
+
+static inline int sctp_packet_empty(struct sctp_packet *packet)
+{
+	return packet->size == packet->overhead;
+}
+
+/* This represents a remote transport address.
+ * For local transport addresses, we just use union sctp_addr.
+ *
+ * RFC2960 Section 1.4 Key Terms
+ *
+ *   o	Transport address:  A Transport Address is traditionally defined
+ *	by Network Layer address, Transport Layer protocol and Transport
+ *	Layer port number.  In the case of SCTP running over IP, a
+ *	transport address is defined by the combination of an IP address
+ *	and an SCTP port number (where SCTP is the Transport protocol).
+ *
+ * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control
+ *
+ *   o	The sender keeps a separate congestion control parameter set for
+ *	each of the destination addresses it can send to (not each
+ *	source-destination pair but for each destination).  The parameters
+ *	should decay if the address is not used for a long enough time
+ *	period.
+ *
+ */
+struct sctp_transport {
+	/* A list of transports. */
+	struct list_head transports;
+
+	/* Reference counting. */
+	atomic_t refcnt;
+	__u32	 dead:1,
+		/* RTO-Pending : A flag used to track if one of the DATA
+		 *		chunks sent to this address is currently being
+		 *		used to compute a RTT. If this flag is 0,
+		 *		the next DATA chunk sent to this destination
+		 *		should be used to compute a RTT and this flag
+		 *		should be set. Every time the RTT
+		 *		calculation completes (i.e. the DATA chunk
+		 *		is SACK'd) clear this flag.
+		 */
+		 rto_pending:1,
+
+		/*
+		 * hb_sent : a flag that signals that we have a pending
+		 * heartbeat.
+		 */
+		hb_sent:1,
+
+		/* Is the Path MTU update pending on this tranport */
+		pmtu_pending:1,
+
+		/* Is this structure kfree()able? */
+		malloced:1;
+
+	struct flowi fl;
+
+	/* This is the peer's IP address and port. */
+	union sctp_addr ipaddr;
+
+	/* These are the functions we call to handle LLP stuff.	 */
+	struct sctp_af *af_specific;
+
+	/* Which association do we belong to?  */
+	struct sctp_association *asoc;
+
+	/* RFC2960
+	 *
+	 * 12.3 Per Transport Address Data
+	 *
+	 * For each destination transport address in the peer's
+	 * address list derived from the INIT or INIT ACK chunk, a
+	 * number of data elements needs to be maintained including:
+	 */
+	/* RTO	       : The current retransmission timeout value.  */
+	unsigned long rto;
+
+	__u32 rtt;		/* This is the most recent RTT.	 */
+
+	/* RTTVAR      : The current RTT variation.  */
+	__u32 rttvar;
+
+	/* SRTT	       : The current smoothed round trip time.	*/
+	__u32 srtt;
+
+	/*
+	 * These are the congestion stats.
+	 */
+	/* cwnd	       : The current congestion window.	 */
+	__u32 cwnd;		  /* This is the actual cwnd.  */
+
+	/* ssthresh    : The current slow start threshold value.  */
+	__u32 ssthresh;
+
+	/* partial     : The tracking method for increase of cwnd when in
+	 * bytes acked : congestion avoidance mode (see Section 6.2.2)
+	 */
+	__u32 partial_bytes_acked;
+
+	/* Data that has been sent, but not acknowledged. */
+	__u32 flight_size;
+
+	__u32 burst_limited;	/* Holds old cwnd when max.burst is applied */
+
+	/* Destination */
+	struct dst_entry *dst;
+	/* Source address. */
+	union sctp_addr saddr;
+
+	/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
+	 * the destination address every heartbeat interval.
+	 */
+	unsigned long hbinterval;
+
+	/* SACK delay timeout */
+	unsigned long sackdelay;
+	__u32 sackfreq;
+
+	/* When was the last time (in jiffies) that we heard from this
+	 * transport?  We use this to pick new active and retran paths.
+	 */
+	unsigned long last_time_heard;
+
+	/* Last time(in jiffies) when cwnd is reduced due to the congestion
+	 * indication based on ECNE chunk.
+	 */
+	unsigned long last_time_ecne_reduced;
+
+	/* This is the max_retrans value for the transport and will
+	 * be initialized from the assocs value.  This can be changed
+	 * using SCTP_SET_PEER_ADDR_PARAMS socket option.
+	 */
+	__u16 pathmaxrxt;
+
+	/* PMTU	      : The current known path MTU.  */
+	__u32 pathmtu;
+
+	/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
+	__u32 param_flags;
+
+	/* The number of times INIT has been sent on this transport. */
+	int init_sent_count;
+
+	/* state       : The current state of this destination,
+	 *             : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN.
+	 */
+	int state;
+
+	/* These are the error stats for this destination.  */
+
+	/* Error count : The current error count for this destination.	*/
+	unsigned short error_count;
+
+	/* Per	       : A timer used by each destination.
+	 * Destination :
+	 * Timer       :
+	 *
+	 * [Everywhere else in the text this is called T3-rtx. -ed]
+	 */
+	struct timer_list T3_rtx_timer;
+
+	/* Heartbeat timer is per destination. */
+	struct timer_list hb_timer;
+
+	/* Timer to handle ICMP proto unreachable envets */
+	struct timer_list proto_unreach_timer;
+
+	/* Since we're using per-destination retransmission timers
+	 * (see above), we're also using per-destination "transmitted"
+	 * queues.  This probably ought to be a private struct
+	 * accessible only within the outqueue, but it's not, yet.
+	 */
+	struct list_head transmitted;
+
+	/* We build bundle-able packets for this transport here.  */
+	struct sctp_packet packet;
+
+	/* This is the list of transports that have chunks to send.  */
+	struct list_head send_ready;
+
+	/* State information saved for SFR_CACC algorithm. The key
+	 * idea in SFR_CACC is to maintain state at the sender on a
+	 * per-destination basis when a changeover happens.
+	 *	char changeover_active;
+	 *	char cycling_changeover;
+	 *	__u32 next_tsn_at_change;
+	 *	char cacc_saw_newack;
+	 */
+	struct {
+		/* An unsigned integer, which stores the next TSN to be
+		 * used by the sender, at the moment of changeover.
+		 */
+		__u32 next_tsn_at_change;
+
+		/* A flag which indicates the occurrence of a changeover */
+		char changeover_active;
+
+		/* A flag which indicates whether the change of primary is
+		 * the first switch to this destination address during an
+		 * active switch.
+		 */
+		char cycling_changeover;
+
+		/* A temporary flag, which is used during the processing of
+		 * a SACK to estimate the causative TSN(s)'s group.
+		 */
+		char cacc_saw_newack;
+	} cacc;
+
+	/* 64-bit random number sent with heartbeat. */
+	__u64 hb_nonce;
+};
+
+struct sctp_transport *sctp_transport_new(const union sctp_addr *,
+					  gfp_t);
+void sctp_transport_set_owner(struct sctp_transport *,
+			      struct sctp_association *);
+void sctp_transport_route(struct sctp_transport *, union sctp_addr *,
+			  struct sctp_sock *);
+void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk);
+void sctp_transport_free(struct sctp_transport *);
+void sctp_transport_reset_timers(struct sctp_transport *);
+void sctp_transport_hold(struct sctp_transport *);
+void sctp_transport_put(struct sctp_transport *);
+void sctp_transport_update_rto(struct sctp_transport *, __u32);
+void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
+void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
+void sctp_transport_burst_limited(struct sctp_transport *);
+void sctp_transport_burst_reset(struct sctp_transport *);
+unsigned long sctp_transport_timeout(struct sctp_transport *);
+void sctp_transport_reset(struct sctp_transport *);
+void sctp_transport_update_pmtu(struct sctp_transport *, u32);
+void sctp_transport_immediate_rtx(struct sctp_transport *);
+
+
+/* This is the structure we use to queue packets as they come into
+ * SCTP.  We write packets to it and read chunks from it.
+ */
+struct sctp_inq {
+	/* This is actually a queue of sctp_chunk each
+	 * containing a partially decoded packet.
+	 */
+	struct list_head in_chunk_list;
+	/* This is the packet which is currently off the in queue and is
+	 * being worked on through the inbound chunk processing.
+	 */
+	struct sctp_chunk *in_progress;
+
+	/* This is the delayed task to finish delivering inbound
+	 * messages.
+	 */
+	struct work_struct immediate;
+
+	int malloced;	     /* Is this structure kfree()able?	*/
+};
+
+void sctp_inq_init(struct sctp_inq *);
+void sctp_inq_free(struct sctp_inq *);
+void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
+struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
+struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
+void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
+
+/* This is the structure we use to hold outbound chunks.  You push
+ * chunks in and they automatically pop out the other end as bundled
+ * packets (it calls (*output_handler)()).
+ *
+ * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1,
+ * and 8.2 of the v13 draft.
+ *
+ * It handles retransmissions.	The connection to the timeout portion
+ * of the state machine is through sctp_..._timeout() and timeout_handler.
+ *
+ * If you feed it SACKs, it will eat them.
+ *
+ * If you give it big chunks, it will fragment them.
+ *
+ * It assigns TSN's to data chunks.  This happens at the last possible
+ * instant before transmission.
+ *
+ * When free()'d, it empties itself out via output_handler().
+ */
+struct sctp_outq {
+	struct sctp_association *asoc;
+
+	/* Data pending that has never been transmitted.  */
+	struct list_head out_chunk_list;
+
+	unsigned out_qlen;	/* Total length of queued data chunks. */
+
+	/* Error of send failed, may used in SCTP_SEND_FAILED event. */
+	unsigned error;
+
+	/* These are control chunks we want to send.  */
+	struct list_head control_chunk_list;
+
+	/* These are chunks that have been sacked but are above the
+	 * CTSN, or cumulative tsn ack point.
+	 */
+	struct list_head sacked;
+
+	/* Put chunks on this list to schedule them for
+	 * retransmission.
+	 */
+	struct list_head retransmit;
+
+	/* Put chunks on this list to save them for FWD TSN processing as
+	 * they were abandoned.
+	 */
+	struct list_head abandoned;
+
+	/* How many unackd bytes do we have in-flight?	*/
+	__u32 outstanding_bytes;
+
+	/* Are we doing fast-rtx on this queue */
+	char fast_rtx;
+
+	/* Corked? */
+	char cork;
+
+	/* Is this structure empty?  */
+	char empty;
+
+	/* Are we kfree()able? */
+	char malloced;
+};
+
+void sctp_outq_init(struct sctp_association *, struct sctp_outq *);
+void sctp_outq_teardown(struct sctp_outq *);
+void sctp_outq_free(struct sctp_outq*);
+int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk);
+int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *);
+int sctp_outq_is_empty(const struct sctp_outq *);
+void sctp_outq_restart(struct sctp_outq *);
+
+void sctp_retransmit(struct sctp_outq *, struct sctp_transport *,
+		     sctp_retransmit_reason_t);
+void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
+int sctp_outq_uncork(struct sctp_outq *);
+/* Uncork and flush an outqueue.  */
+static inline void sctp_outq_cork(struct sctp_outq *q)
+{
+	q->cork = 1;
+}
+
+/* These bind address data fields common between endpoints and associations */
+struct sctp_bind_addr {
+
+	/* RFC 2960 12.1 Parameters necessary for the SCTP instance
+	 *
+	 * SCTP Port:	The local SCTP port number the endpoint is
+	 *		bound to.
+	 */
+	__u16 port;
+
+	/* RFC 2960 12.1 Parameters necessary for the SCTP instance
+	 *
+	 * Address List: The list of IP addresses that this instance
+	 *	has bound.  This information is passed to one's
+	 *	peer(s) in INIT and INIT ACK chunks.
+	 */
+	struct list_head address_list;
+
+	int malloced;	     /* Are we kfree()able?  */
+};
+
+void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port);
+void sctp_bind_addr_free(struct sctp_bind_addr *);
+int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
+			const struct sctp_bind_addr *src,
+			sctp_scope_t scope, gfp_t gfp,
+			int flags);
+int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
+			const struct sctp_bind_addr *src,
+			gfp_t gfp);
+int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
+		       __u8 addr_state, gfp_t gfp);
+int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
+int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
+			 struct sctp_sock *);
+int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *,
+			 struct sctp_sock *, struct sctp_sock *);
+int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
+			 const union sctp_addr *addr);
+union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr	*bp,
+					const union sctp_addr	*addrs,
+					int			addrcnt,
+					struct sctp_sock	*opt);
+union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
+					 int *addrs_len,
+					 gfp_t gfp);
+int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len,
+			   __u16 port, gfp_t gfp);
+
+sctp_scope_t sctp_scope(const union sctp_addr *);
+int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope);
+int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
+int sctp_addr_is_valid(const union sctp_addr *addr);
+int sctp_is_ep_boundall(struct sock *sk);
+
+
+/* What type of endpoint?  */
+typedef enum {
+	SCTP_EP_TYPE_SOCKET,
+	SCTP_EP_TYPE_ASSOCIATION,
+} sctp_endpoint_type_t;
+
+/*
+ * A common base class to bridge the implmentation view of a
+ * socket (usually listening) endpoint versus an association's
+ * local endpoint.
+ * This common structure is useful for several purposes:
+ *   1) Common interface for lookup routines.
+ *	a) Subfunctions work for either endpoint or association
+ *	b) Single interface to lookup allows hiding the lookup lock rather
+ *	   than acquiring it externally.
+ *   2) Common interface for the inbound chunk handling/state machine.
+ *   3) Common object handling routines for reference counting, etc.
+ *   4) Disentangle association lookup from endpoint lookup, where we
+ *	do not have to find our endpoint to find our association.
+ *
+ */
+
+struct sctp_ep_common {
+	/* Fields to help us manage our entries in the hash tables. */
+	struct hlist_node node;
+	int hashent;
+
+	/* Runtime type information.  What kind of endpoint is this? */
+	sctp_endpoint_type_t type;
+
+	/* Some fields to help us manage this object.
+	 *   refcnt   - Reference count access to this object.
+	 *   dead     - Do not attempt to use this object.
+	 *   malloced - Do we need to kfree this object?
+	 */
+	atomic_t    refcnt;
+	char	    dead;
+	char	    malloced;
+
+	/* What socket does this endpoint belong to?  */
+	struct sock *sk;
+
+	/* This is where we receive inbound chunks.  */
+	struct sctp_inq	  inqueue;
+
+	/* This substructure includes the defining parameters of the
+	 * endpoint:
+	 * bind_addr.port is our shared port number.
+	 * bind_addr.address_list is our set of local IP addresses.
+	 */
+	struct sctp_bind_addr bind_addr;
+};
+
+
+/* RFC Section 1.4 Key Terms
+ *
+ * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a
+ *   multi-homed host, an SCTP endpoint is represented to its peers as a
+ *   combination of a set of eligible destination transport addresses to
+ *   which SCTP packets can be sent and a set of eligible source
+ *   transport addresses from which SCTP packets can be received.
+ *   All transport addresses used by an SCTP endpoint must use the
+ *   same port number, but can use multiple IP addresses. A transport
+ *   address used by an SCTP endpoint must not be used by another
+ *   SCTP endpoint. In other words, a transport address is unique
+ *   to an SCTP endpoint.
+ *
+ * From an implementation perspective, each socket has one of these.
+ * A TCP-style socket will have exactly one association on one of
+ * these.  An UDP-style socket will have multiple associations hanging
+ * off one of these.
+ */
+
+struct sctp_endpoint {
+	/* Common substructure for endpoint and association. */
+	struct sctp_ep_common base;
+
+	/* Associations: A list of current associations and mappings
+	 *	      to the data consumers for each association. This
+	 *	      may be in the form of a hash table or other
+	 *	      implementation dependent structure. The data
+	 *	      consumers may be process identification
+	 *	      information such as file descriptors, named pipe
+	 *	      pointer, or table pointers dependent on how SCTP
+	 *	      is implemented.
+	 */
+	/* This is really a list of struct sctp_association entries. */
+	struct list_head asocs;
+
+	/* Secret Key: A secret key used by this endpoint to compute
+	 *	      the MAC.	This SHOULD be a cryptographic quality
+	 *	      random number with a sufficient length.
+	 *	      Discussion in [RFC1750] can be helpful in
+	 *	      selection of the key.
+	 */
+	__u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE];
+	int current_key;
+	int last_key;
+	int key_changed_at;
+
+ 	/* digest:  This is a digest of the sctp cookie.  This field is
+ 	 * 	    only used on the receive path when we try to validate
+ 	 * 	    that the cookie has not been tampered with.  We put
+ 	 * 	    this here so we pre-allocate this once and can re-use
+ 	 * 	    on every receive.
+ 	 */
+ 	__u8 *digest;
+ 
+	/* sendbuf acct. policy.	*/
+	__u32 sndbuf_policy;
+
+	/* rcvbuf acct. policy.	*/
+	__u32 rcvbuf_policy;
+
+	/* SCTP AUTH: array of the HMACs that will be allocated
+	 * we need this per association so that we don't serialize
+	 */
+	struct crypto_hash **auth_hmacs;
+
+	/* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
+	 struct sctp_hmac_algo_param *auth_hmacs_list;
+
+	/* SCTP-AUTH: chunks to authenticate encoded into parameter */
+	struct sctp_chunks_param *auth_chunk_list;
+
+	/* SCTP-AUTH: endpoint shared keys */
+	struct list_head endpoint_shared_keys;
+	__u16 active_key_id;
+};
+
+/* Recover the outter endpoint structure. */
+static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base)
+{
+	struct sctp_endpoint *ep;
+
+	ep = container_of(base, struct sctp_endpoint, base);
+	return ep;
+}
+
+/* These are function signatures for manipulating endpoints.  */
+struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t);
+void sctp_endpoint_free(struct sctp_endpoint *);
+void sctp_endpoint_put(struct sctp_endpoint *);
+void sctp_endpoint_hold(struct sctp_endpoint *);
+void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *);
+struct sctp_association *sctp_endpoint_lookup_assoc(
+	const struct sctp_endpoint *ep,
+	const union sctp_addr *paddr,
+	struct sctp_transport **);
+int sctp_endpoint_is_peeled_off(struct sctp_endpoint *,
+				const union sctp_addr *);
+struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
+					const union sctp_addr *);
+int sctp_has_association(const union sctp_addr *laddr,
+			 const union sctp_addr *paddr);
+
+int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t,
+		     sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk,
+		     struct sctp_chunk **err_chunk);
+int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk,
+		      const union sctp_addr *peer,
+		      sctp_init_chunk_t *init, gfp_t gfp);
+__u32 sctp_generate_tag(const struct sctp_endpoint *);
+__u32 sctp_generate_tsn(const struct sctp_endpoint *);
+
+struct sctp_inithdr_host {
+	__u32 init_tag;
+	__u32 a_rwnd;
+	__u16 num_outbound_streams;
+	__u16 num_inbound_streams;
+	__u32 initial_tsn;
+};
+
+/* RFC2960
+ *
+ * 12. Recommended Transmission Control Block (TCB) Parameters
+ *
+ * This section details a recommended set of parameters that should
+ * be contained within the TCB for an implementation. This section is
+ * for illustrative purposes and should not be deemed as requirements
+ * on an implementation or as an exhaustive list of all parameters
+ * inside an SCTP TCB. Each implementation may need its own additional
+ * parameters for optimization.
+ */
+
+
+/* Here we have information about each individual association. */
+struct sctp_association {
+
+	/* A base structure common to endpoint and association.
+	 * In this context, it represents the associations's view
+	 * of the local endpoint of the association.
+	 */
+	struct sctp_ep_common base;
+
+	/* Associations on the same socket. */
+	struct list_head asocs;
+
+	/* association id. */
+	sctp_assoc_t assoc_id;
+
+	/* This is our parent endpoint.	 */
+	struct sctp_endpoint *ep;
+
+	/* These are those association elements needed in the cookie.  */
+	struct sctp_cookie c;
+
+	/* This is all information about our peer.  */
+	struct {
+		/* rwnd
+		 *
+		 * Peer Rwnd   : Current calculated value of the peer's rwnd.
+		 */
+		__u32 rwnd;
+
+		/* transport_addr_list
+		 *
+		 * Peer	       : A list of SCTP transport addresses that the
+		 * Transport   : peer is bound to. This information is derived
+		 * Address     : from the INIT or INIT ACK and is used to
+		 * List	       : associate an inbound packet with a given
+		 *	       : association. Normally this information is
+		 *	       : hashed or keyed for quick lookup and access
+		 *	       : of the TCB.
+		 *	       : The list is also initialized with the list
+		 *	       : of addresses passed with the sctp_connectx()
+		 *	       : call.
+		 *
+		 * It is a list of SCTP_transport's.
+		 */
+		struct list_head transport_addr_list;
+
+		/* transport_count
+		 *
+		 * Peer        : A count of the number of peer addresses
+		 * Transport   : in the Peer Transport Address List.
+		 * Address     :
+		 * Count       :
+		 */
+		__u16 transport_count;
+
+		/* port
+		 *   The transport layer port number.
+		 */
+		__u16 port;
+
+		/* primary_path
+		 *
+		 * Primary     : This is the current primary destination
+		 * Path	       : transport address of the peer endpoint.  It
+		 *	       : may also specify a source transport address
+		 *	       : on this endpoint.
+		 *
+		 * All of these paths live on transport_addr_list.
+		 *
+		 * At the bakeoffs, we discovered that the intent of
+		 * primaryPath is that it only changes when the ULP
+		 * asks to have it changed.  We add the activePath to
+		 * designate the connection we are currently using to
+		 * transmit new data and most control chunks.
+		 */
+		struct sctp_transport *primary_path;
+
+		/* Cache the primary path address here, when we
+		 * need a an address for msg_name.
+		 */
+		union sctp_addr primary_addr;
+
+		/* active_path
+		 *   The path that we are currently using to
+		 *   transmit new data and most control chunks.
+		 */
+		struct sctp_transport *active_path;
+
+		/* retran_path
+		 *
+		 * RFC2960 6.4 Multi-homed SCTP Endpoints
+		 * ...
+		 * Furthermore, when its peer is multi-homed, an
+		 * endpoint SHOULD try to retransmit a chunk to an
+		 * active destination transport address that is
+		 * different from the last destination address to
+		 * which the DATA chunk was sent.
+		 */
+		struct sctp_transport *retran_path;
+
+		/* Pointer to last transport I have sent on.  */
+		struct sctp_transport *last_sent_to;
+
+		/* This is the last transport I have received DATA on.	*/
+		struct sctp_transport *last_data_from;
+
+		/*
+		 * Mapping  An array of bits or bytes indicating which out of
+		 * Array    order TSN's have been received (relative to the
+		 *	    Last Rcvd TSN). If no gaps exist, i.e. no out of
+		 *	    order packets have been received, this array
+		 *	    will be set to all zero. This structure may be
+		 *	    in the form of a circular buffer or bit array.
+		 *
+		 * Last Rcvd   : This is the last TSN received in
+		 * TSN	       : sequence. This value is set initially by
+		 *	       : taking the peer's Initial TSN, received in
+		 *	       : the INIT or INIT ACK chunk, and subtracting
+		 *	       : one from it.
+		 *
+		 * Throughout most of the specification this is called the
+		 * "Cumulative TSN ACK Point".	In this case, we
+		 * ignore the advice in 12.2 in favour of the term
+		 * used in the bulk of the text.  This value is hidden
+		 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
+		 */
+		struct sctp_tsnmap tsn_map;
+
+		/* Ack State   : This flag indicates if the next received
+		 *             : packet is to be responded to with a
+		 *             : SACK. This is initializedto 0.  When a packet
+		 *             : is received it is incremented. If this value
+		 *             : reaches 2 or more, a SACK is sent and the
+		 *             : value is reset to 0. Note: This is used only
+		 *             : when no DATA chunks are received out of
+		 *             : order.  When DATA chunks are out of order,
+		 *             : SACK's are not delayed (see Section 6).
+		 */
+		__u8    sack_needed;     /* Do we need to sack the peer? */
+		__u32	sack_cnt;
+
+		/* These are capabilities which our peer advertised.  */
+		__u8	ecn_capable:1,	    /* Can peer do ECN? */
+			ipv4_address:1,	    /* Peer understands IPv4 addresses? */
+			ipv6_address:1,	    /* Peer understands IPv6 addresses? */
+			hostname_address:1, /* Peer understands DNS addresses? */
+			asconf_capable:1,   /* Does peer support ADDIP? */
+			prsctp_capable:1,   /* Can peer do PR-SCTP? */
+			auth_capable:1;	    /* Is peer doing SCTP-AUTH? */
+
+		__u32   adaptation_ind;	 /* Adaptation Code point. */
+
+		/* This mask is used to disable sending the ASCONF chunk
+		 * with specified parameter to peer.
+		 */
+		__be16 addip_disabled_mask;
+
+		struct sctp_inithdr_host i;
+		int cookie_len;
+		void *cookie;
+
+		/* ADDIP Section 4.2 Upon reception of an ASCONF Chunk.
+		 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
+		 * Initial TSN Value minus 1
+		 */
+		__u32 addip_serial;
+
+		/* SCTP-AUTH: We need to know pears random number, hmac list
+		 * and authenticated chunk list.  All that is part of the
+		 * cookie and these are just pointers to those locations
+		 */
+		sctp_random_param_t *peer_random;
+		sctp_chunks_param_t *peer_chunks;
+		sctp_hmac_algo_param_t *peer_hmacs;
+	} peer;
+
+	/* State       : A state variable indicating what state the
+	 *	       : association is in, i.e. COOKIE-WAIT,
+	 *	       : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
+	 *	       : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
+	 *
+	 *		Note: No "CLOSED" state is illustrated since if a
+	 *		association is "CLOSED" its TCB SHOULD be removed.
+	 *
+	 *		In this implementation we DO have a CLOSED
+	 *		state which is used during initiation and shutdown.
+	 *
+	 *		State takes values from SCTP_STATE_*.
+	 */
+	sctp_state_t state;
+
+	/* The cookie life I award for any cookie.  */
+	struct timeval cookie_life;
+
+	/* Overall     : The overall association error count.
+	 * Error Count : [Clear this any time I get something.]
+	 */
+	int overall_error_count;
+
+	/* These are the association's initial, max, and min RTO values.
+	 * These values will be initialized by system defaults, but can
+	 * be modified via the SCTP_RTOINFO socket option.
+	 */
+	unsigned long rto_initial;
+	unsigned long rto_max;
+	unsigned long rto_min;
+
+	/* Maximum number of new data packets that can be sent in a burst.  */
+	int max_burst;
+
+	/* This is the max_retrans value for the association.  This value will
+	 * be initialized initialized from system defaults, but can be
+	 * modified by the SCTP_ASSOCINFO socket option.
+	 */
+	int max_retrans;
+
+	/* Maximum number of times the endpoint will retransmit INIT  */
+	__u16 max_init_attempts;
+
+	/* How many times have we resent an INIT? */
+	__u16 init_retries;
+
+	/* The largest timeout or RTO value to use in attempting an INIT */
+	unsigned long max_init_timeo;
+
+	/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
+	 * the destination address every heartbeat interval. This value
+	 * will be inherited by all new transports.
+	 */
+	unsigned long hbinterval;
+
+	/* This is the max_retrans value for new transports in the
+	 * association.
+	 */
+	__u16 pathmaxrxt;
+
+	/* Flag that path mtu update is pending */
+	__u8   pmtu_pending;
+
+	/* Association : The smallest PMTU discovered for all of the
+	 * PMTU	       : peer's transport addresses.
+	 */
+	__u32 pathmtu;
+
+	/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
+	__u32 param_flags;
+
+	/* SACK delay timeout */
+	unsigned long sackdelay;
+	__u32 sackfreq;
+
+
+	unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
+	struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES];
+
+	/* Transport to which SHUTDOWN chunk was last sent.  */
+	struct sctp_transport *shutdown_last_sent_to;
+
+	/* How many times have we resent a SHUTDOWN */
+	int shutdown_retries;
+
+	/* Transport to which INIT chunk was last sent.  */
+	struct sctp_transport *init_last_sent_to;
+
+	/* Next TSN    : The next TSN number to be assigned to a new
+	 *	       : DATA chunk.  This is sent in the INIT or INIT
+	 *	       : ACK chunk to the peer and incremented each
+	 *	       : time a DATA chunk is assigned a TSN
+	 *	       : (normally just prior to transmit or during
+	 *	       : fragmentation).
+	 */
+	__u32 next_tsn;
+
+	/*
+	 * Last Rcvd   : This is the last TSN received in sequence.  This value
+	 * TSN	       : is set initially by taking the peer's Initial TSN,
+	 *	       : received in the INIT or INIT ACK chunk, and
+	 *	       : subtracting one from it.
+	 *
+	 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point.
+	 */
+
+	__u32 ctsn_ack_point;
+
+	/* PR-SCTP Advanced.Peer.Ack.Point */
+	__u32 adv_peer_ack_point;
+
+	/* Highest TSN that is acknowledged by incoming SACKs. */
+	__u32 highest_sacked;
+
+	/* TSN marking the fast recovery exit point */
+	__u32 fast_recovery_exit;
+
+	/* Flag to track the current fast recovery state */
+	__u8 fast_recovery;
+
+	/* The number of unacknowledged data chunks.  Reported through
+	 * the SCTP_STATUS sockopt.
+	 */
+	__u16 unack_data;
+
+	/* The total number of data chunks that we've had to retransmit
+	 * as the result of a T3 timer expiration
+	 */
+	__u32 rtx_data_chunks;
+
+	/* This is the association's receive buffer space.  This value is used
+	 * to set a_rwnd field in an INIT or a SACK chunk.
+	 */
+	__u32 rwnd;
+
+	/* This is the last advertised value of rwnd over a SACK chunk. */
+	__u32 a_rwnd;
+
+	/* Number of bytes by which the rwnd has slopped.  The rwnd is allowed
+	 * to slop over a maximum of the association's frag_point.
+	 */
+	__u32 rwnd_over;
+
+	/* Keeps treack of rwnd pressure.  This happens when we have
+	 * a window, but not recevie buffer (i.e small packets).  This one
+	 * is releases slowly (1 PMTU at a time ).
+	 */
+	__u32 rwnd_press;
+
+	/* This is the sndbuf size in use for the association.
+	 * This corresponds to the sndbuf size for the association,
+	 * as specified in the sk->sndbuf.
+	 */
+	int sndbuf_used;
+
+	/* This is the amount of memory that this association has allocated
+	 * in the receive path at any given time.
+	 */
+	atomic_t rmem_alloc;
+
+	/* This is the wait queue head for send requests waiting on
+	 * the association sndbuf space.
+	 */
+	wait_queue_head_t	wait;
+
+	/* The message size at which SCTP fragmentation will occur. */
+	__u32 frag_point;
+	__u32 user_frag;
+
+	/* Counter used to count INIT errors. */
+	int init_err_counter;
+
+	/* Count the number of INIT cycles (for doubling timeout). */
+	int init_cycle;
+
+	/* Default send parameters. */
+	__u16 default_stream;
+	__u16 default_flags;
+	__u32 default_ppid;
+	__u32 default_context;
+	__u32 default_timetolive;
+
+	/* Default receive parameters */
+	__u32 default_rcv_context;
+
+	/* This tracks outbound ssn for a given stream.	 */
+	struct sctp_ssnmap *ssnmap;
+
+	/* All outbound chunks go through this structure.  */
+	struct sctp_outq outqueue;
+
+	/* A smart pipe that will handle reordering and fragmentation,
+	 * as well as handle passing events up to the ULP.
+	 */
+	struct sctp_ulpq ulpq;
+
+	/* Last TSN that caused an ECNE Chunk to be sent.  */
+	__u32 last_ecne_tsn;
+
+	/* Last TSN that caused a CWR Chunk to be sent.	 */
+	__u32 last_cwr_tsn;
+
+	/* How many duplicated TSNs have we seen?  */
+	int numduptsns;
+
+	/* Number of seconds of idle time before an association is closed.
+	 * In the association context, this is really used as a boolean
+	 * since the real timeout is stored in the timeouts array
+	 */
+	__u32 autoclose;
+
+	/* These are to support
+	 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses
+	 *  and Enforcement of Flow and Message Limits"
+	 * <draft-ietf-tsvwg-addip-sctp-02.txt>
+	 * or "ADDIP" for short.
+	 */
+
+
+
+	/* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
+	 *
+	 * R1) One and only one ASCONF Chunk MAY be in transit and
+	 * unacknowledged at any one time.  If a sender, after sending
+	 * an ASCONF chunk, decides it needs to transfer another
+	 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
+	 * returns from the previous ASCONF Chunk before sending a
+	 * subsequent ASCONF. Note this restriction binds each side,
+	 * so at any time two ASCONF may be in-transit on any given
+	 * association (one sent from each endpoint).
+	 *
+	 * [This is our one-and-only-one ASCONF in flight.  If we do
+	 * not have an ASCONF in flight, this is NULL.]
+	 */
+	struct sctp_chunk *addip_last_asconf;
+
+	/* ADDIP Section 5.2 Upon reception of an ASCONF Chunk.
+	 *
+	 * This is needed to implement itmes E1 - E4 of the updated
+	 * spec.  Here is the justification:
+	 *
+	 * Since the peer may bundle multiple ASCONF chunks toward us,
+	 * we now need the ability to cache multiple ACKs.  The section
+	 * describes in detail how they are cached and cleaned up.
+	 */
+	struct list_head asconf_ack_list;
+
+	/* These ASCONF chunks are waiting to be sent.
+	 *
+	 * These chunaks can't be pushed to outqueue until receiving
+	 * ASCONF_ACK for the previous ASCONF indicated by
+	 * addip_last_asconf, so as to guarantee that only one ASCONF
+	 * is in flight at any time.
+	 *
+	 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
+	 *
+	 * In defining the ASCONF Chunk transfer procedures, it is
+	 * essential that these transfers MUST NOT cause congestion
+	 * within the network.	To achieve this, we place these
+	 * restrictions on the transfer of ASCONF Chunks:
+	 *
+	 * R1) One and only one ASCONF Chunk MAY be in transit and
+	 * unacknowledged at any one time.  If a sender, after sending
+	 * an ASCONF chunk, decides it needs to transfer another
+	 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
+	 * returns from the previous ASCONF Chunk before sending a
+	 * subsequent ASCONF. Note this restriction binds each side,
+	 * so at any time two ASCONF may be in-transit on any given
+	 * association (one sent from each endpoint).
+	 *
+	 *
+	 * [I really think this is EXACTLY the sort of intelligence
+	 *  which already resides in sctp_outq.	 Please move this
+	 *  queue and its supporting logic down there.	--piggy]
+	 */
+	struct list_head addip_chunk_list;
+
+	/* ADDIP Section 4.1 ASCONF Chunk Procedures
+	 *
+	 * A2) A serial number should be assigned to the Chunk. The
+	 * serial number SHOULD be a monotonically increasing
+	 * number. The serial number SHOULD be initialized at
+	 * the start of the association to the same value as the
+	 * Initial TSN and every time a new ASCONF chunk is created
+	 * it is incremented by one after assigning the serial number
+	 * to the newly created chunk.
+	 *
+	 * ADDIP
+	 * 3.1.1  Address/Stream Configuration Change Chunk (ASCONF)
+	 *
+	 * Serial Number : 32 bits (unsigned integer)
+	 *
+	 * This value represents a Serial Number for the ASCONF
+	 * Chunk. The valid range of Serial Number is from 0 to
+	 * 4294967295 (2^32 - 1).  Serial Numbers wrap back to 0
+	 * after reaching 4294967295.
+	 */
+	__u32 addip_serial;
+	union sctp_addr *asconf_addr_del_pending;
+	int src_out_of_asoc_ok;
+	struct sctp_transport *new_transport;
+
+	/* SCTP AUTH: list of the endpoint shared keys.  These
+	 * keys are provided out of band by the user applicaton
+	 * and can't change during the lifetime of the association
+	 */
+	struct list_head endpoint_shared_keys;
+
+	/* SCTP AUTH:
+	 * The current generated assocaition shared key (secret)
+	 */
+	struct sctp_auth_bytes *asoc_shared_key;
+
+	/* SCTP AUTH: hmac id of the first peer requested algorithm
+	 * that we support.
+	 */
+	__u16 default_hmac_id;
+
+	__u16 active_key_id;
+
+	__u8 need_ecne:1,	/* Need to send an ECNE Chunk? */
+	     temp:1;		/* Is it a temporary association? */
+};
+
+
+/* An eyecatcher for determining if we are really looking at an
+ * association data structure.
+ */
+enum {
+	SCTP_ASSOC_EYECATCHER = 0xa550c123,
+};
+
+/* Recover the outter association structure. */
+static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base)
+{
+	struct sctp_association *asoc;
+
+	asoc = container_of(base, struct sctp_association, base);
+	return asoc;
+}
+
+/* These are function signatures for manipulating associations.	 */
+
+
+struct sctp_association *
+sctp_association_new(const struct sctp_endpoint *, const struct sock *,
+		     sctp_scope_t scope, gfp_t gfp);
+void sctp_association_free(struct sctp_association *);
+void sctp_association_put(struct sctp_association *);
+void sctp_association_hold(struct sctp_association *);
+
+struct sctp_transport *sctp_assoc_choose_alter_transport(
+	struct sctp_association *, struct sctp_transport *);
+void sctp_assoc_update_retran_path(struct sctp_association *);
+struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
+					  const union sctp_addr *);
+int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
+			    const union sctp_addr *laddr);
+struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
+				     const union sctp_addr *address,
+				     const gfp_t gfp,
+				     const int peer_state);
+void sctp_assoc_del_peer(struct sctp_association *asoc,
+			 const union sctp_addr *addr);
+void sctp_assoc_rm_peer(struct sctp_association *asoc,
+			 struct sctp_transport *peer);
+void sctp_assoc_control_transport(struct sctp_association *,
+				  struct sctp_transport *,
+				  sctp_transport_cmd_t, sctp_sn_error_t);
+struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
+struct sctp_transport *sctp_assoc_is_match(struct sctp_association *,
+					   const union sctp_addr *,
+					   const union sctp_addr *);
+void sctp_assoc_migrate(struct sctp_association *, struct sock *);
+void sctp_assoc_update(struct sctp_association *old,
+		       struct sctp_association *new);
+
+__u32 sctp_association_get_next_tsn(struct sctp_association *);
+
+void sctp_assoc_sync_pmtu(struct sctp_association *);
+void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned);
+void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned);
+void sctp_assoc_set_primary(struct sctp_association *,
+			    struct sctp_transport *);
+void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
+				    struct sctp_transport *);
+int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *,
+				     sctp_scope_t, gfp_t);
+int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
+					 struct sctp_cookie*,
+					 gfp_t gfp);
+int sctp_assoc_set_id(struct sctp_association *, gfp_t);
+void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc);
+struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
+					const struct sctp_association *asoc,
+					__be32 serial);
+void sctp_asconf_queue_teardown(struct sctp_association *asoc);
+
+int sctp_cmp_addr_exact(const union sctp_addr *ss1,
+			const union sctp_addr *ss2);
+struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
+
+/* A convenience structure to parse out SCTP specific CMSGs. */
+typedef struct sctp_cmsgs {
+	struct sctp_initmsg *init;
+	struct sctp_sndrcvinfo *info;
+} sctp_cmsgs_t;
+
+/* Structure for tracking memory objects */
+typedef struct {
+	char *label;
+	atomic_t *counter;
+} sctp_dbg_objcnt_entry_t;
+
+#endif /* __sctp_structs_h__ */
diff --git a/include/net/sctp/tsnmap.h b/include/net/sctp/tsnmap.h
new file mode 100644
index 00000000..e7728bc1
--- /dev/null
+++ b/include/net/sctp/tsnmap.h
@@ -0,0 +1,178 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * These are the definitions needed for the tsnmap type.  The tsnmap is used
+ * to track out of order TSNs received.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *   Jon Grimm             <jgrimm@us.ibm.com>
+ *   La Monte H.P. Yarroll <piggy@acm.org>
+ *   Karl Knutson          <karl@athena.chicago.il.us>
+ *   Sridhar Samudrala     <sri@us.ibm.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+#include <net/sctp/constants.h>
+
+#ifndef __sctp_tsnmap_h__
+#define __sctp_tsnmap_h__
+
+/* RFC 2960 12.2 Parameters necessary per association (i.e. the TCB)
+ * Mapping  An array of bits or bytes indicating which out of
+ * Array    order TSN's have been received (relative to the
+ *          Last Rcvd TSN). If no gaps exist, i.e. no out of
+ *          order packets have been received, this array
+ *          will be set to all zero. This structure may be
+ *          in the form of a circular buffer or bit array.
+ */
+struct sctp_tsnmap {
+	/* This array counts the number of chunks with each TSN.
+	 * It points at one of the two buffers with which we will
+	 * ping-pong between.
+	 */
+	unsigned long *tsn_map;
+
+	/* This is the TSN at tsn_map[0].  */
+	__u32 base_tsn;
+
+	/* Last Rcvd   : This is the last TSN received in
+	 * TSN	       : sequence. This value is set initially by
+	 *             : taking the peer's Initial TSN, received in
+	 *             : the INIT or INIT ACK chunk, and subtracting
+	 *             : one from it.
+	 *
+	 * Throughout most of the specification this is called the
+	 * "Cumulative TSN ACK Point".  In this case, we
+	 * ignore the advice in 12.2 in favour of the term
+	 * used in the bulk of the text.
+	 */
+	__u32 cumulative_tsn_ack_point;
+
+	/* This is the highest TSN we've marked.  */
+	__u32 max_tsn_seen;
+
+	/* This is the minimum number of TSNs we can track.  This corresponds
+	 * to the size of tsn_map.   Note: the overflow_map allows us to
+	 * potentially track more than this quantity.
+	 */
+	__u16 len;
+
+	/* Data chunks pending receipt. used by SCTP_STATUS sockopt */
+	__u16 pending_data;
+
+	/* Record duplicate TSNs here.  We clear this after
+	 * every SACK.  Store up to SCTP_MAX_DUP_TSNS worth of
+	 * information.
+	 */
+	__u16 num_dup_tsns;
+	__be32 dup_tsns[SCTP_MAX_DUP_TSNS];
+};
+
+struct sctp_tsnmap_iter {
+	__u32 start;
+};
+
+/* Initialize a block of memory as a tsnmap.  */
+struct sctp_tsnmap *sctp_tsnmap_init(struct sctp_tsnmap *, __u16 len,
+				     __u32 initial_tsn, gfp_t gfp);
+
+void sctp_tsnmap_free(struct sctp_tsnmap *map);
+
+/* Test the tracking state of this TSN.
+ * Returns:
+ *   0 if the TSN has not yet been seen
+ *  >0 if the TSN has been seen (duplicate)
+ *  <0 if the TSN is invalid (too large to track)
+ */
+int sctp_tsnmap_check(const struct sctp_tsnmap *, __u32 tsn);
+
+/* Mark this TSN as seen.  */
+int sctp_tsnmap_mark(struct sctp_tsnmap *, __u32 tsn);
+
+/* Mark this TSN and all lower as seen. */
+void sctp_tsnmap_skip(struct sctp_tsnmap *map, __u32 tsn);
+
+/* Retrieve the Cumulative TSN ACK Point.  */
+static inline __u32 sctp_tsnmap_get_ctsn(const struct sctp_tsnmap *map)
+{
+	return map->cumulative_tsn_ack_point;
+}
+
+/* Retrieve the highest TSN we've seen.  */
+static inline __u32 sctp_tsnmap_get_max_tsn_seen(const struct sctp_tsnmap *map)
+{
+	return map->max_tsn_seen;
+}
+
+/* How many duplicate TSNs are stored? */
+static inline __u16 sctp_tsnmap_num_dups(struct sctp_tsnmap *map)
+{
+	return map->num_dup_tsns;
+}
+
+/* Return pointer to duplicate tsn array as needed by SACK. */
+static inline __be32 *sctp_tsnmap_get_dups(struct sctp_tsnmap *map)
+{
+	map->num_dup_tsns = 0;
+	return map->dup_tsns;
+}
+
+/* How many gap ack blocks do we have recorded? */
+__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map,
+			   struct sctp_gap_ack_block *gabs);
+
+/* Refresh the count on pending data. */
+__u16 sctp_tsnmap_pending(struct sctp_tsnmap *map);
+
+/* Is there a gap in the TSN map?  */
+static inline int sctp_tsnmap_has_gap(const struct sctp_tsnmap *map)
+{
+	return map->cumulative_tsn_ack_point != map->max_tsn_seen;
+}
+
+/* Mark a duplicate TSN.  Note:  limit the storage of duplicate TSN
+ * information.
+ */
+static inline void sctp_tsnmap_mark_dup(struct sctp_tsnmap *map, __u32 tsn)
+{
+	if (map->num_dup_tsns < SCTP_MAX_DUP_TSNS)
+		map->dup_tsns[map->num_dup_tsns++] = htonl(tsn);
+}
+
+/* Renege a TSN that was seen.  */
+void sctp_tsnmap_renege(struct sctp_tsnmap *, __u32 tsn);
+
+/* Is there a gap in the TSN map? */
+int sctp_tsnmap_has_gap(const struct sctp_tsnmap *);
+
+#endif /* __sctp_tsnmap_h__ */
diff --git a/include/net/sctp/ulpevent.h b/include/net/sctp/ulpevent.h
new file mode 100644
index 00000000..ca4693b4
--- /dev/null
+++ b/include/net/sctp/ulpevent.h
@@ -0,0 +1,171 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * These are the definitions needed for the sctp_ulpevent type.  The
+ * sctp_ulpevent type is used to carry information from the state machine
+ * upwards to the ULP.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *   Jon Grimm             <jgrimm@us.ibm.com>
+ *   La Monte H.P. Yarroll <piggy@acm.org>
+ *   Karl Knutson          <karl@athena.chicago.il.us>
+ *   Sridhar Samudrala     <sri@us.ibm.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#ifndef __sctp_ulpevent_h__
+#define __sctp_ulpevent_h__
+
+/* A structure to carry information to the ULP (e.g. Sockets API) */
+/* Warning: This sits inside an skb.cb[] area.  Be very careful of
+ * growing this structure as it is at the maximum limit now.
+ */
+struct sctp_ulpevent {
+	struct sctp_association *asoc;
+	__u16 stream;
+	__u16 ssn;
+	__u16 flags;
+	__u32 ppid;
+	__u32 tsn;
+	__u32 cumtsn;
+	int msg_flags;
+	int iif;
+	unsigned int rmem_len;
+};
+
+/* Retrieve the skb this event sits inside of. */
+static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
+{
+	return container_of((void *)ev, struct sk_buff, cb);
+}
+
+/* Retrieve & cast the event sitting inside the skb. */
+static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
+{
+	return (struct sctp_ulpevent *)skb->cb;
+}
+
+void sctp_ulpevent_free(struct sctp_ulpevent *);
+int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
+unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list);
+
+struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
+	const struct sctp_association *asoc,
+	__u16 flags,
+	__u16 state,
+	__u16 error,
+	__u16 outbound,
+	__u16 inbound,
+	struct sctp_chunk *chunk,
+	gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
+	const struct sctp_association *asoc,
+	const struct sockaddr_storage *aaddr,
+	int flags,
+	int state,
+	int error,
+	gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
+	const struct sctp_association *asoc,
+	struct sctp_chunk *chunk,
+	__u16 flags,
+	gfp_t gfp);
+struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
+	const struct sctp_association *asoc,
+	struct sctp_chunk *chunk,
+	__u16 flags,
+	__u32 error,
+	gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
+	const struct sctp_association *asoc,
+	__u16 flags,
+	gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
+	const struct sctp_association *asoc,
+	__u32 indication, gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
+	const struct sctp_association *asoc, gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
+	struct sctp_chunk *chunk,
+	gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_authkey(
+	const struct sctp_association *asoc, __u16 key_id,
+	__u32 indication, gfp_t gfp);
+
+struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
+	const struct sctp_association *asoc, gfp_t gfp);
+
+void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
+	struct msghdr *);
+__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
+
+/* Is this event type enabled? */
+static inline int sctp_ulpevent_type_enabled(__u16 sn_type,
+					     struct sctp_event_subscribe *mask)
+{
+	char *amask = (char *) mask;
+	return amask[sn_type - SCTP_SN_TYPE_BASE];
+}
+
+/* Given an event subscription, is this event enabled? */
+static inline int sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
+					   struct sctp_event_subscribe *mask)
+{
+	__u16 sn_type;
+	int enabled = 1;
+
+	if (sctp_ulpevent_is_notification(event)) {
+		sn_type = sctp_ulpevent_get_notification_type(event);
+		enabled = sctp_ulpevent_type_enabled(sn_type, mask);
+	}
+	return enabled;
+}
+
+#endif /* __sctp_ulpevent_h__ */
+
+
+
+
+
+
+
diff --git a/include/net/sctp/ulpqueue.h b/include/net/sctp/ulpqueue.h
new file mode 100644
index 00000000..2e5ee0d8
--- /dev/null
+++ b/include/net/sctp/ulpqueue.h
@@ -0,0 +1,94 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * These are the definitions needed for the sctp_ulpq type.  The
+ * sctp_ulpq is the interface between the Upper Layer Protocol, or ULP,
+ * and the core SCTP state machine.  This is the component which handles
+ * reassembly and ordering.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation  is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresses:
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *   Jon Grimm             <jgrimm@us.ibm.com>
+ *   La Monte H.P. Yarroll <piggy@acm.org>
+ *   Sridhar Samudrala     <sri@us.ibm.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#ifndef __sctp_ulpqueue_h__
+#define __sctp_ulpqueue_h__
+
+/* A structure to carry information to the ULP (e.g. Sockets API) */
+struct sctp_ulpq {
+	char malloced;
+	char pd_mode;
+	struct sctp_association *asoc;
+	struct sk_buff_head reasm;
+	struct sk_buff_head lobby;
+};
+
+/* Prototypes. */
+struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *,
+				 struct sctp_association *);
+void sctp_ulpq_flush(struct sctp_ulpq *ulpq);
+void sctp_ulpq_free(struct sctp_ulpq *);
+
+/* Add a new DATA chunk for processing. */
+int sctp_ulpq_tail_data(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);
+
+/* Add a new event for propagation to the ULP. */
+int sctp_ulpq_tail_event(struct sctp_ulpq *, struct sctp_ulpevent *ev);
+
+/* Renege previously received chunks.  */
+void sctp_ulpq_renege(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);
+
+/* Perform partial delivery. */
+void sctp_ulpq_partial_delivery(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);
+
+/* Abort the partial delivery. */
+void sctp_ulpq_abort_pd(struct sctp_ulpq *, gfp_t);
+
+/* Clear the partial data delivery condition on this socket. */
+int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc);
+
+/* Skip over an SSN. */
+void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn);
+
+void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *, __u32);
+#endif /* __sctp_ulpqueue_h__ */
+
+
+
+
+
+
+
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
new file mode 100644
index 00000000..0842ef00
--- /dev/null
+++ b/include/net/sctp/user.h
@@ -0,0 +1,744 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2002 Intel Corp.
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * This header represents the structures and constants needed to support
+ * the SCTP Extension to the Sockets API.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *    La Monte H.P. Yarroll    <piggy@acm.org>
+ *    R. Stewart               <randall@sctp.chicago.il.us>
+ *    K. Morneau               <kmorneau@cisco.com>
+ *    Q. Xie                   <qxie1@email.mot.com>
+ *    Karl Knutson             <karl@athena.chicago.il.us>
+ *    Jon Grimm                <jgrimm@us.ibm.com>
+ *    Daisy Chang              <daisyc@us.ibm.com>
+ *    Ryan Layer               <rmlayer@us.ibm.com>
+ *    Ardelle Fan	       <ardelle.fan@intel.com>
+ *    Sridhar Samudrala        <sri@us.ibm.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#ifndef __net_sctp_user_h__
+#define __net_sctp_user_h__
+
+#include <linux/types.h>
+#include <linux/socket.h>
+
+typedef __s32 sctp_assoc_t;
+
+/* The following symbols come from the Sockets API Extensions for
+ * SCTP <draft-ietf-tsvwg-sctpsocket-07.txt>.
+ */
+#define SCTP_RTOINFO	0
+#define SCTP_ASSOCINFO  1
+#define SCTP_INITMSG	2
+#define SCTP_NODELAY	3		/* Get/set nodelay option. */
+#define SCTP_AUTOCLOSE	4
+#define SCTP_SET_PEER_PRIMARY_ADDR 5
+#define SCTP_PRIMARY_ADDR	6
+#define SCTP_ADAPTATION_LAYER	7
+#define SCTP_DISABLE_FRAGMENTS	8
+#define SCTP_PEER_ADDR_PARAMS	9
+#define SCTP_DEFAULT_SEND_PARAM	10
+#define SCTP_EVENTS	11
+#define SCTP_I_WANT_MAPPED_V4_ADDR 12	/* Turn on/off mapped v4 addresses  */
+#define SCTP_MAXSEG	13		/* Get/set maximum fragment. */
+#define SCTP_STATUS	14
+#define SCTP_GET_PEER_ADDR_INFO	15
+#define SCTP_DELAYED_ACK_TIME	16
+#define SCTP_DELAYED_ACK SCTP_DELAYED_ACK_TIME
+#define SCTP_DELAYED_SACK SCTP_DELAYED_ACK_TIME
+#define SCTP_CONTEXT	17
+#define SCTP_FRAGMENT_INTERLEAVE	18
+#define SCTP_PARTIAL_DELIVERY_POINT	19 /* Set/Get partial delivery point */
+#define SCTP_MAX_BURST	20		/* Set/Get max burst */
+#define SCTP_AUTH_CHUNK	21	/* Set only: add a chunk type to authenticate */
+#define SCTP_HMAC_IDENT	22
+#define SCTP_AUTH_KEY	23
+#define SCTP_AUTH_ACTIVE_KEY	24
+#define SCTP_AUTH_DELETE_KEY	25
+#define SCTP_PEER_AUTH_CHUNKS	26	/* Read only */
+#define SCTP_LOCAL_AUTH_CHUNKS	27	/* Read only */
+#define SCTP_GET_ASSOC_NUMBER	28	/* Read only */
+#define SCTP_GET_ASSOC_ID_LIST	29	/* Read only */
+#define SCTP_AUTO_ASCONF       30
+
+/* Internal Socket Options. Some of the sctp library functions are
+ * implemented using these socket options.
+ */
+#define SCTP_SOCKOPT_BINDX_ADD	100	/* BINDX requests for adding addrs */
+#define SCTP_SOCKOPT_BINDX_REM	101	/* BINDX requests for removing addrs. */
+#define SCTP_SOCKOPT_PEELOFF	102	/* peel off association. */
+/* Options 104-106 are deprecated and removed. Do not use this space */
+#define SCTP_SOCKOPT_CONNECTX_OLD	107	/* CONNECTX old requests. */
+#define SCTP_GET_PEER_ADDRS	108		/* Get all peer address. */
+#define SCTP_GET_LOCAL_ADDRS	109		/* Get all local address. */
+#define SCTP_SOCKOPT_CONNECTX	110		/* CONNECTX requests. */
+#define SCTP_SOCKOPT_CONNECTX3	111	/* CONNECTX requests (updated) */
+
+/*
+ * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
+ *
+ *   This cmsghdr structure provides information for initializing new
+ *   SCTP associations with sendmsg().  The SCTP_INITMSG socket option
+ *   uses this same data structure.  This structure is not used for
+ *   recvmsg().
+ *
+ *   cmsg_level    cmsg_type      cmsg_data[]
+ *   ------------  ------------   ----------------------
+ *   IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
+ *
+ */
+struct sctp_initmsg {
+	__u16 sinit_num_ostreams;
+	__u16 sinit_max_instreams;
+	__u16 sinit_max_attempts;
+	__u16 sinit_max_init_timeo;
+};
+
+/*
+ * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
+ *
+ *   This cmsghdr structure specifies SCTP options for sendmsg() and
+ *   describes SCTP header information about a received message through
+ *   recvmsg().
+ *
+ *   cmsg_level    cmsg_type      cmsg_data[]
+ *   ------------  ------------   ----------------------
+ *   IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
+ *
+ */
+struct sctp_sndrcvinfo {
+	__u16 sinfo_stream;
+	__u16 sinfo_ssn;
+	__u16 sinfo_flags;
+	__u32 sinfo_ppid;
+	__u32 sinfo_context;
+	__u32 sinfo_timetolive;
+	__u32 sinfo_tsn;
+	__u32 sinfo_cumtsn;
+	sctp_assoc_t sinfo_assoc_id;
+};
+
+/*
+ *  sinfo_flags: 16 bits (unsigned integer)
+ *
+ *   This field may contain any of the following flags and is composed of
+ *   a bitwise OR of these values.
+ */
+
+enum sctp_sinfo_flags {
+	SCTP_UNORDERED = 1,  /* Send/receive message unordered. */
+	SCTP_ADDR_OVER = 2,  /* Override the primary destination. */
+	SCTP_ABORT=4,        /* Send an ABORT message to the peer. */
+	SCTP_SACK_IMMEDIATELY = 8,	/* SACK should be sent without delay */
+	SCTP_EOF=MSG_FIN,    /* Initiate graceful shutdown process. */	
+};
+
+
+/* These are cmsg_types.  */
+typedef enum sctp_cmsg_type {
+	SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */
+	SCTP_SNDRCV,            /* 5.2.2 SCTP Header Information Structure */
+} sctp_cmsg_t;
+
+
+/*
+ * 5.3.1.1 SCTP_ASSOC_CHANGE
+ *
+ *   Communication notifications inform the ULP that an SCTP association
+ *   has either begun or ended. The identifier for a new association is
+ *   provided by this notificaion. The notification information has the
+ *   following format:
+ *
+ */
+struct sctp_assoc_change {
+	__u16 sac_type;
+	__u16 sac_flags;
+	__u32 sac_length;
+	__u16 sac_state;
+	__u16 sac_error;
+	__u16 sac_outbound_streams;
+	__u16 sac_inbound_streams;
+	sctp_assoc_t sac_assoc_id;
+	__u8 sac_info[0];
+};
+
+/*
+ *   sac_state: 32 bits (signed integer)
+ *
+ *   This field holds one of a number of values that communicate the
+ *   event that happened to the association.  They include:
+ *
+ *   Note:  The following state names deviate from the API draft as
+ *   the names clash too easily with other kernel symbols.
+ */
+enum sctp_sac_state {
+	SCTP_COMM_UP,
+	SCTP_COMM_LOST,
+	SCTP_RESTART,
+	SCTP_SHUTDOWN_COMP,
+	SCTP_CANT_STR_ASSOC,
+};
+
+/*
+ * 5.3.1.2 SCTP_PEER_ADDR_CHANGE
+ *
+ *   When a destination address on a multi-homed peer encounters a change
+ *   an interface details event is sent.  The information has the
+ *   following structure:
+ */
+struct sctp_paddr_change {
+	__u16 spc_type;
+	__u16 spc_flags;
+	__u32 spc_length;
+	struct sockaddr_storage spc_aaddr;
+	int spc_state;
+	int spc_error;
+	sctp_assoc_t spc_assoc_id;
+} __attribute__((packed, aligned(4)));
+
+/*
+ *    spc_state:  32 bits (signed integer)
+ *
+ *   This field holds one of a number of values that communicate the
+ *   event that happened to the address.  They include:
+ */
+enum sctp_spc_state {
+	SCTP_ADDR_AVAILABLE,
+	SCTP_ADDR_UNREACHABLE,
+	SCTP_ADDR_REMOVED,
+	SCTP_ADDR_ADDED,
+	SCTP_ADDR_MADE_PRIM,
+	SCTP_ADDR_CONFIRMED,
+};
+
+
+/*
+ * 5.3.1.3 SCTP_REMOTE_ERROR
+ *
+ *   A remote peer may send an Operational Error message to its peer.
+ *   This message indicates a variety of error conditions on an
+ *   association. The entire error TLV as it appears on the wire is
+ *   included in a SCTP_REMOTE_ERROR event.  Please refer to the SCTP
+ *   specification [SCTP] and any extensions for a list of possible
+ *   error formats. SCTP error TLVs have the format:
+ */
+struct sctp_remote_error {
+	__u16 sre_type;
+	__u16 sre_flags;
+	__u32 sre_length;
+	__u16 sre_error;
+	sctp_assoc_t sre_assoc_id;
+	__u8 sre_data[0];
+};
+
+
+/*
+ * 5.3.1.4 SCTP_SEND_FAILED
+ *
+ *   If SCTP cannot deliver a message it may return the message as a
+ *   notification.
+ */
+struct sctp_send_failed {
+	__u16 ssf_type;
+	__u16 ssf_flags;
+	__u32 ssf_length;
+	__u32 ssf_error;
+	struct sctp_sndrcvinfo ssf_info;
+	sctp_assoc_t ssf_assoc_id;
+	__u8 ssf_data[0];
+};
+
+/*
+ *   ssf_flags: 16 bits (unsigned integer)
+ *
+ *   The flag value will take one of the following values
+ *
+ *   SCTP_DATA_UNSENT  - Indicates that the data was never put on
+ *                       the wire.
+ *
+ *   SCTP_DATA_SENT    - Indicates that the data was put on the wire.
+ *                       Note that this does not necessarily mean that the
+ *                       data was (or was not) successfully delivered.
+ */
+enum sctp_ssf_flags {
+	SCTP_DATA_UNSENT,
+	SCTP_DATA_SENT,
+};
+
+/*
+ * 5.3.1.5 SCTP_SHUTDOWN_EVENT
+ *
+ *   When a peer sends a SHUTDOWN, SCTP delivers this notification to
+ *   inform the application that it should cease sending data.
+ */
+struct sctp_shutdown_event {
+	__u16 sse_type;
+	__u16 sse_flags;
+	__u32 sse_length;
+	sctp_assoc_t sse_assoc_id;
+};
+
+/*
+ * 5.3.1.6 SCTP_ADAPTATION_INDICATION
+ *
+ *   When a peer sends a Adaptation Layer Indication parameter , SCTP
+ *   delivers this notification to inform the application
+ *   that of the peers requested adaptation layer.
+ */
+struct sctp_adaptation_event {
+	__u16 sai_type;
+	__u16 sai_flags;
+	__u32 sai_length;
+	__u32 sai_adaptation_ind;
+	sctp_assoc_t sai_assoc_id;
+};
+
+/*
+ * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
+ *
+ *   When a receiver is engaged in a partial delivery of a
+ *   message this notification will be used to indicate
+ *   various events.
+ */
+struct sctp_pdapi_event {
+	__u16 pdapi_type;
+	__u16 pdapi_flags;
+	__u32 pdapi_length;
+	__u32 pdapi_indication;
+	sctp_assoc_t pdapi_assoc_id;
+};
+
+enum { SCTP_PARTIAL_DELIVERY_ABORTED=0, };
+
+struct sctp_authkey_event {
+	__u16 auth_type;
+	__u16 auth_flags;
+	__u32 auth_length;
+	__u16 auth_keynumber;
+	__u16 auth_altkeynumber;
+	__u32 auth_indication;
+	sctp_assoc_t auth_assoc_id;
+};
+
+enum { SCTP_AUTH_NEWKEY = 0, };
+
+/*
+ * 6.1.9. SCTP_SENDER_DRY_EVENT
+ *
+ * When the SCTP stack has no more user data to send or retransmit, this
+ * notification is given to the user. Also, at the time when a user app
+ * subscribes to this event, if there is no data to be sent or
+ * retransmit, the stack will immediately send up this notification.
+ */
+struct sctp_sender_dry_event {
+	__u16 sender_dry_type;
+	__u16 sender_dry_flags;
+	__u32 sender_dry_length;
+	sctp_assoc_t sender_dry_assoc_id;
+};
+
+/*
+ * Described in Section 7.3
+ *   Ancillary Data and Notification Interest Options
+ */
+struct sctp_event_subscribe {
+	__u8 sctp_data_io_event;
+	__u8 sctp_association_event;
+	__u8 sctp_address_event;
+	__u8 sctp_send_failure_event;
+	__u8 sctp_peer_error_event;
+	__u8 sctp_shutdown_event;
+	__u8 sctp_partial_delivery_event;
+	__u8 sctp_adaptation_layer_event;
+	__u8 sctp_authentication_event;
+	__u8 sctp_sender_dry_event;
+};
+
+/*
+ * 5.3.1 SCTP Notification Structure
+ *
+ *   The notification structure is defined as the union of all
+ *   notification types.
+ *
+ */
+union sctp_notification {
+	struct {
+		__u16 sn_type;             /* Notification type. */
+		__u16 sn_flags;
+		__u32 sn_length;
+	} sn_header;
+	struct sctp_assoc_change sn_assoc_change;
+	struct sctp_paddr_change sn_paddr_change;
+	struct sctp_remote_error sn_remote_error;
+	struct sctp_send_failed sn_send_failed;
+	struct sctp_shutdown_event sn_shutdown_event;
+	struct sctp_adaptation_event sn_adaptation_event;
+	struct sctp_pdapi_event sn_pdapi_event;
+	struct sctp_authkey_event sn_authkey_event;
+	struct sctp_sender_dry_event sn_sender_dry_event;
+};
+
+/* Section 5.3.1
+ * All standard values for sn_type flags are greater than 2^15.
+ * Values from 2^15 and down are reserved.
+ */
+
+enum sctp_sn_type {
+	SCTP_SN_TYPE_BASE     = (1<<15),
+	SCTP_ASSOC_CHANGE,
+	SCTP_PEER_ADDR_CHANGE,
+	SCTP_SEND_FAILED,
+	SCTP_REMOTE_ERROR,
+	SCTP_SHUTDOWN_EVENT,
+	SCTP_PARTIAL_DELIVERY_EVENT,
+	SCTP_ADAPTATION_INDICATION,
+	SCTP_AUTHENTICATION_EVENT,
+#define SCTP_AUTHENTICATION_INDICATION	SCTP_AUTHENTICATION_EVENT
+	SCTP_SENDER_DRY_EVENT,
+};
+
+/* Notification error codes used to fill up the error fields in some
+ * notifications.
+ * SCTP_PEER_ADDRESS_CHAGE 	: spc_error
+ * SCTP_ASSOC_CHANGE		: sac_error
+ * These names should be potentially included in the draft 04 of the SCTP
+ * sockets API specification.
+ */
+typedef enum sctp_sn_error {
+	SCTP_FAILED_THRESHOLD,
+	SCTP_RECEIVED_SACK,
+	SCTP_HEARTBEAT_SUCCESS,
+	SCTP_RESPONSE_TO_USER_REQ,
+	SCTP_INTERNAL_ERROR,
+	SCTP_SHUTDOWN_GUARD_EXPIRES,
+	SCTP_PEER_FAULTY,
+} sctp_sn_error_t;
+
+/*
+ * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)
+ *
+ *   The protocol parameters used to initialize and bound retransmission
+ *   timeout (RTO) are tunable.  See [SCTP] for more information on how
+ *   these parameters are used in RTO calculation. 
+ */
+struct sctp_rtoinfo {
+	sctp_assoc_t	srto_assoc_id;
+	__u32		srto_initial;
+	__u32		srto_max;
+	__u32		srto_min;
+};
+
+/*
+ * 7.1.2 Association Parameters (SCTP_ASSOCINFO)
+ *
+ *   This option is used to both examine and set various association and
+ *   endpoint parameters.
+ */
+struct sctp_assocparams {
+	sctp_assoc_t	sasoc_assoc_id;
+	__u16		sasoc_asocmaxrxt;
+	__u16		sasoc_number_peer_destinations;
+	__u32		sasoc_peer_rwnd;
+	__u32		sasoc_local_rwnd;
+	__u32		sasoc_cookie_life;
+};
+
+/*
+ * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
+ *
+ *  Requests that the peer mark the enclosed address as the association
+ *  primary. The enclosed address must be one of the association's
+ *  locally bound addresses. The following structure is used to make a
+ *   set primary request:
+ */
+struct sctp_setpeerprim {
+	sctp_assoc_t            sspp_assoc_id;
+	struct sockaddr_storage sspp_addr;
+} __attribute__((packed, aligned(4)));
+
+/*
+ * 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
+ *
+ *  Requests that the local SCTP stack use the enclosed peer address as
+ *  the association primary. The enclosed address must be one of the
+ *  association peer's addresses. The following structure is used to
+ *  make a set peer primary request:
+ */
+struct sctp_prim {
+	sctp_assoc_t            ssp_assoc_id;
+	struct sockaddr_storage ssp_addr;
+} __attribute__((packed, aligned(4)));
+
+/*
+ * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
+ *
+ * Requests that the local endpoint set the specified Adaptation Layer
+ * Indication parameter for all future INIT and INIT-ACK exchanges.
+ */
+struct sctp_setadaptation {
+	__u32	ssb_adaptation_ind;
+};
+
+/*
+ * 7.1.13 Peer Address Parameters  (SCTP_PEER_ADDR_PARAMS)
+ *
+ *   Applications can enable or disable heartbeats for any peer address
+ *   of an association, modify an address's heartbeat interval, force a
+ *   heartbeat to be sent immediately, and adjust the address's maximum
+ *   number of retransmissions sent before an address is considered
+ *   unreachable. The following structure is used to access and modify an
+ *   address's parameters:
+ */
+enum  sctp_spp_flags {
+	SPP_HB_ENABLE = 1<<0,		/*Enable heartbeats*/
+	SPP_HB_DISABLE = 1<<1,		/*Disable heartbeats*/
+	SPP_HB = SPP_HB_ENABLE | SPP_HB_DISABLE,
+	SPP_HB_DEMAND = 1<<2,		/*Send heartbeat immediately*/
+	SPP_PMTUD_ENABLE = 1<<3,	/*Enable PMTU discovery*/
+	SPP_PMTUD_DISABLE = 1<<4,	/*Disable PMTU discovery*/
+	SPP_PMTUD = SPP_PMTUD_ENABLE | SPP_PMTUD_DISABLE,
+	SPP_SACKDELAY_ENABLE = 1<<5,	/*Enable SACK*/
+	SPP_SACKDELAY_DISABLE = 1<<6,	/*Disable SACK*/
+	SPP_SACKDELAY = SPP_SACKDELAY_ENABLE | SPP_SACKDELAY_DISABLE,
+	SPP_HB_TIME_IS_ZERO = 1<<7,	/* Set HB delay to 0 */
+};
+
+struct sctp_paddrparams {
+	sctp_assoc_t		spp_assoc_id;
+	struct sockaddr_storage	spp_address;
+	__u32			spp_hbinterval;
+	__u16			spp_pathmaxrxt;
+	__u32			spp_pathmtu;
+	__u32			spp_sackdelay;
+	__u32			spp_flags;
+} __attribute__((packed, aligned(4)));
+
+/*
+ * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
+ *
+ * This set option adds a chunk type that the user is requesting to be
+ * received only in an authenticated way.  Changes to the list of chunks
+ * will only effect future associations on the socket.
+ */
+struct sctp_authchunk {
+	__u8		sauth_chunk;
+};
+
+/*
+ * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
+ *
+ * This option gets or sets the list of HMAC algorithms that the local
+ * endpoint requires the peer to use.
+*/
+struct sctp_hmacalgo {
+	__u32		shmac_num_idents;
+	__u16		shmac_idents[];
+};
+
+/*
+ * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
+ *
+ * This option will set a shared secret key which is used to build an
+ * association shared key.
+ */
+struct sctp_authkey {
+	sctp_assoc_t	sca_assoc_id;
+	__u16		sca_keynumber;
+	__u16		sca_keylength;
+	__u8		sca_key[];
+};
+
+/*
+ * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
+ *
+ * This option will get or set the active shared key to be used to build
+ * the association shared key.
+ */
+
+struct sctp_authkeyid {
+	sctp_assoc_t	scact_assoc_id;
+	__u16		scact_keynumber;
+};
+
+
+/*
+ * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
+ *
+ * This option will effect the way delayed acks are performed.  This
+ * option allows you to get or set the delayed ack time, in
+ * milliseconds.  It also allows changing the delayed ack frequency.
+ * Changing the frequency to 1 disables the delayed sack algorithm.  If
+ * the assoc_id is 0, then this sets or gets the endpoints default
+ * values.  If the assoc_id field is non-zero, then the set or get
+ * effects the specified association for the one to many model (the
+ * assoc_id field is ignored by the one to one model).  Note that if
+ * sack_delay or sack_freq are 0 when setting this option, then the
+ * current values will remain unchanged.
+ */
+struct sctp_sack_info {
+	sctp_assoc_t	sack_assoc_id;
+	uint32_t	sack_delay;
+	uint32_t	sack_freq;
+};
+
+struct sctp_assoc_value {
+    sctp_assoc_t            assoc_id;
+    uint32_t                assoc_value;
+};
+
+/*
+ * 7.2.2 Peer Address Information
+ *
+ *   Applications can retrieve information about a specific peer address
+ *   of an association, including its reachability state, congestion
+ *   window, and retransmission timer values.  This information is
+ *   read-only. The following structure is used to access this
+ *   information:
+ */
+struct sctp_paddrinfo {
+	sctp_assoc_t		spinfo_assoc_id;
+	struct sockaddr_storage	spinfo_address;
+	__s32			spinfo_state;
+	__u32			spinfo_cwnd;
+	__u32			spinfo_srtt;
+	__u32			spinfo_rto;
+	__u32			spinfo_mtu;
+} __attribute__((packed, aligned(4)));
+
+/* Peer addresses's state. */
+/* UNKNOWN: Peer address passed by the upper layer in sendmsg or connect[x]
+ * calls.
+ * UNCONFIRMED: Peer address received in INIT/INIT-ACK address parameters.
+ *              Not yet confirmed by a heartbeat and not available for data
+ *		transfers.
+ * ACTIVE : Peer address confirmed, active and available for data transfers.
+ * INACTIVE: Peer address inactive and not available for data transfers.
+ */
+enum sctp_spinfo_state {
+	SCTP_INACTIVE,
+	SCTP_ACTIVE,
+	SCTP_UNCONFIRMED,
+	SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
+};
+
+/*
+ * 7.2.1 Association Status (SCTP_STATUS)
+ *
+ *   Applications can retrieve current status information about an
+ *   association, including association state, peer receiver window size,
+ *   number of unacked data chunks, and number of data chunks pending
+ *   receipt.  This information is read-only.  The following structure is
+ *   used to access this information:
+ */
+struct sctp_status {
+	sctp_assoc_t		sstat_assoc_id;
+	__s32			sstat_state;
+	__u32			sstat_rwnd;
+	__u16			sstat_unackdata;
+	__u16			sstat_penddata;
+	__u16			sstat_instrms;
+	__u16			sstat_outstrms;
+	__u32			sstat_fragmentation_point;
+	struct sctp_paddrinfo	sstat_primary;
+};
+
+/*
+ * 7.2.3.  Get the list of chunks the peer requires to be authenticated
+ *         (SCTP_PEER_AUTH_CHUNKS)
+ *
+ * This option gets a list of chunks for a specified association that
+ * the peer requires to be received authenticated only.
+ */
+struct sctp_authchunks {
+	sctp_assoc_t	gauth_assoc_id;
+	__u32		gauth_number_of_chunks;
+	uint8_t		gauth_chunks[];
+};
+
+/*
+ * 8.2.6. Get the Current Identifiers of Associations
+ *        (SCTP_GET_ASSOC_ID_LIST)
+ *
+ * This option gets the current list of SCTP association identifiers of
+ * the SCTP associations handled by a one-to-many style socket.
+ */
+struct sctp_assoc_ids {
+	__u32		gaids_number_of_ids;
+	sctp_assoc_t	gaids_assoc_id[];
+};
+
+/*
+ * 8.3, 8.5 get all peer/local addresses in an association.
+ * This parameter struct is used by SCTP_GET_PEER_ADDRS and 
+ * SCTP_GET_LOCAL_ADDRS socket options used internally to implement
+ * sctp_getpaddrs() and sctp_getladdrs() API. 
+ */
+struct sctp_getaddrs_old {
+	sctp_assoc_t            assoc_id;
+	int			addr_num;
+	struct sockaddr		__user *addrs;
+};
+struct sctp_getaddrs {
+	sctp_assoc_t		assoc_id; /*input*/
+	__u32			addr_num; /*output*/
+	__u8			addrs[0]; /*output, variable size*/
+};
+
+/* These are bit fields for msghdr->msg_flags.  See section 5.1.  */
+/* On user space Linux, these live in <bits/socket.h> as an enum.  */
+enum sctp_msg_flags {
+	MSG_NOTIFICATION = 0x8000,
+#define MSG_NOTIFICATION MSG_NOTIFICATION
+};
+
+/*
+ * 8.1 sctp_bindx()
+ *
+ * The flags parameter is formed from the bitwise OR of zero or more of the
+ * following currently defined flags:
+ */
+#define SCTP_BINDX_ADD_ADDR 0x01
+#define SCTP_BINDX_REM_ADDR 0x02
+
+/* This is the structure that is passed as an argument(optval) to
+ * getsockopt(SCTP_SOCKOPT_PEELOFF).
+ */
+typedef struct {
+	sctp_assoc_t associd;
+	int sd;
+} sctp_peeloff_arg_t;
+
+#endif /* __net_sctp_user_h__ */