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Diffstat (limited to 'ANDROID_3.4.5/include/net/sctp/structs.h')
| -rw-r--r-- | ANDROID_3.4.5/include/net/sctp/structs.h | 2037 |
1 files changed, 0 insertions, 2037 deletions
diff --git a/ANDROID_3.4.5/include/net/sctp/structs.h b/ANDROID_3.4.5/include/net/sctp/structs.h deleted file mode 100644 index 88949a99..00000000 --- a/ANDROID_3.4.5/include/net/sctp/structs.h +++ /dev/null @@ -1,2037 +0,0 @@ -/* 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__ */ |