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-rw-r--r--include/net/ip.h475
1 files changed, 475 insertions, 0 deletions
diff --git a/include/net/ip.h b/include/net/ip.h
new file mode 100644
index 00000000..b53d65f2
--- /dev/null
+++ b/include/net/ip.h
@@ -0,0 +1,475 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Definitions for the IP module.
+ *
+ * Version: @(#)ip.h 1.0.2 05/07/93
+ *
+ * Authors: Ross Biro
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ * Alan Cox, <gw4pts@gw4pts.ampr.org>
+ *
+ * Changes:
+ * Mike McLagan : Routing by source
+ *
+ * This program 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 of the License, or (at your option) any later version.
+ */
+#ifndef _IP_H
+#define _IP_H
+
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/skbuff.h>
+
+#include <net/inet_sock.h>
+#include <net/snmp.h>
+#include <net/flow.h>
+
+struct sock;
+
+struct inet_skb_parm {
+ struct ip_options opt; /* Compiled IP options */
+ unsigned char flags;
+
+#define IPSKB_FORWARDED 1
+#define IPSKB_XFRM_TUNNEL_SIZE 2
+#define IPSKB_XFRM_TRANSFORMED 4
+#define IPSKB_FRAG_COMPLETE 8
+#define IPSKB_REROUTED 16
+};
+
+static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
+{
+ return ip_hdr(skb)->ihl * 4;
+}
+
+struct ipcm_cookie {
+ __be32 addr;
+ int oif;
+ struct ip_options_rcu *opt;
+ __u8 tx_flags;
+};
+
+#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
+
+struct ip_ra_chain {
+ struct ip_ra_chain __rcu *next;
+ struct sock *sk;
+ union {
+ void (*destructor)(struct sock *);
+ struct sock *saved_sk;
+ };
+ struct rcu_head rcu;
+};
+
+extern struct ip_ra_chain __rcu *ip_ra_chain;
+
+/* IP flags. */
+#define IP_CE 0x8000 /* Flag: "Congestion" */
+#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
+#define IP_MF 0x2000 /* Flag: "More Fragments" */
+#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
+
+#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
+
+struct msghdr;
+struct net_device;
+struct packet_type;
+struct rtable;
+struct sockaddr;
+
+extern int igmp_mc_proc_init(void);
+
+/*
+ * Functions provided by ip.c
+ */
+
+extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
+ __be32 saddr, __be32 daddr,
+ struct ip_options_rcu *opt);
+extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev);
+extern int ip_local_deliver(struct sk_buff *skb);
+extern int ip_mr_input(struct sk_buff *skb);
+extern int ip_output(struct sk_buff *skb);
+extern int ip_mc_output(struct sk_buff *skb);
+extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
+extern int ip_do_nat(struct sk_buff *skb);
+extern void ip_send_check(struct iphdr *ip);
+extern int __ip_local_out(struct sk_buff *skb);
+extern int ip_local_out(struct sk_buff *skb);
+extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
+extern void ip_init(void);
+extern int ip_append_data(struct sock *sk, struct flowi4 *fl4,
+ int getfrag(void *from, char *to, int offset, int len,
+ int odd, struct sk_buff *skb),
+ void *from, int len, int protolen,
+ struct ipcm_cookie *ipc,
+ struct rtable **rt,
+ unsigned int flags);
+extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
+extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
+ int offset, size_t size, int flags);
+extern struct sk_buff *__ip_make_skb(struct sock *sk,
+ struct flowi4 *fl4,
+ struct sk_buff_head *queue,
+ struct inet_cork *cork);
+extern int ip_send_skb(struct sk_buff *skb);
+extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
+extern void ip_flush_pending_frames(struct sock *sk);
+extern struct sk_buff *ip_make_skb(struct sock *sk,
+ struct flowi4 *fl4,
+ int getfrag(void *from, char *to, int offset, int len,
+ int odd, struct sk_buff *skb),
+ void *from, int length, int transhdrlen,
+ struct ipcm_cookie *ipc,
+ struct rtable **rtp,
+ unsigned int flags);
+
+static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
+{
+ return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
+}
+
+/* datagram.c */
+extern int ip4_datagram_connect(struct sock *sk,
+ struct sockaddr *uaddr, int addr_len);
+
+/*
+ * Map a multicast IP onto multicast MAC for type Token Ring.
+ * This conforms to RFC1469 Option 2 Multicasting i.e.
+ * using a functional address to transmit / receive
+ * multicast packets.
+ */
+
+static inline void ip_tr_mc_map(__be32 addr, char *buf)
+{
+ buf[0]=0xC0;
+ buf[1]=0x00;
+ buf[2]=0x00;
+ buf[3]=0x04;
+ buf[4]=0x00;
+ buf[5]=0x00;
+}
+
+struct ip_reply_arg {
+ struct kvec iov[1];
+ int flags;
+ __wsum csum;
+ int csumoffset; /* u16 offset of csum in iov[0].iov_base */
+ /* -1 if not needed */
+ int bound_dev_if;
+ u8 tos;
+};
+
+#define IP_REPLY_ARG_NOSRCCHECK 1
+
+static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
+{
+ return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
+}
+
+void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
+ const struct ip_reply_arg *arg, unsigned int len);
+
+struct ipv4_config {
+ int log_martians;
+ int no_pmtu_disc;
+};
+
+extern struct ipv4_config ipv4_config;
+#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
+#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
+#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
+#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
+#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
+#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
+#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
+#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
+#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
+#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
+#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
+
+extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
+#if BITS_PER_LONG==32
+extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
+#else
+static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
+{
+ return snmp_fold_field(mib, offt);
+}
+#endif
+extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
+extern void snmp_mib_free(void __percpu *ptr[2]);
+
+extern struct local_ports {
+ seqlock_t lock;
+ int range[2];
+} sysctl_local_ports;
+extern void inet_get_local_port_range(int *low, int *high);
+
+extern unsigned long *sysctl_local_reserved_ports;
+static inline int inet_is_reserved_local_port(int port)
+{
+ return test_bit(port, sysctl_local_reserved_ports);
+}
+
+extern int sysctl_ip_nonlocal_bind;
+
+extern struct ctl_path net_core_path[];
+extern struct ctl_path net_ipv4_ctl_path[];
+
+/* From inetpeer.c */
+extern int inet_peer_threshold;
+extern int inet_peer_minttl;
+extern int inet_peer_maxttl;
+
+/* From ip_output.c */
+extern int sysctl_ip_dynaddr;
+
+extern void ipfrag_init(void);
+
+extern void ip_static_sysctl_init(void);
+
+static inline bool ip_is_fragment(const struct iphdr *iph)
+{
+ return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
+}
+
+#ifdef CONFIG_INET
+#include <net/dst.h>
+
+/* The function in 2.2 was invalid, producing wrong result for
+ * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
+static inline
+int ip_decrease_ttl(struct iphdr *iph)
+{
+ u32 check = (__force u32)iph->check;
+ check += (__force u32)htons(0x0100);
+ iph->check = (__force __sum16)(check + (check>=0xFFFF));
+ return --iph->ttl;
+}
+
+static inline
+int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
+{
+ return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
+ (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
+ !(dst_metric_locked(dst, RTAX_MTU)));
+}
+
+extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
+
+static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
+{
+ if (iph->frag_off & htons(IP_DF)) {
+ /* This is only to work around buggy Windows95/2000
+ * VJ compression implementations. If the ID field
+ * does not change, they drop every other packet in
+ * a TCP stream using header compression.
+ */
+ iph->id = (sk && inet_sk(sk)->inet_daddr) ?
+ htons(inet_sk(sk)->inet_id++) : 0;
+ } else
+ __ip_select_ident(iph, dst, 0);
+}
+
+static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
+{
+ if (iph->frag_off & htons(IP_DF)) {
+ if (sk && inet_sk(sk)->inet_daddr) {
+ iph->id = htons(inet_sk(sk)->inet_id);
+ inet_sk(sk)->inet_id += 1 + more;
+ } else
+ iph->id = 0;
+ } else
+ __ip_select_ident(iph, dst, more);
+}
+
+/*
+ * Map a multicast IP onto multicast MAC for type ethernet.
+ */
+
+static inline void ip_eth_mc_map(__be32 naddr, char *buf)
+{
+ __u32 addr=ntohl(naddr);
+ buf[0]=0x01;
+ buf[1]=0x00;
+ buf[2]=0x5e;
+ buf[5]=addr&0xFF;
+ addr>>=8;
+ buf[4]=addr&0xFF;
+ addr>>=8;
+ buf[3]=addr&0x7F;
+}
+
+/*
+ * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
+ * Leave P_Key as 0 to be filled in by driver.
+ */
+
+static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
+{
+ __u32 addr;
+ unsigned char scope = broadcast[5] & 0xF;
+
+ buf[0] = 0; /* Reserved */
+ buf[1] = 0xff; /* Multicast QPN */
+ buf[2] = 0xff;
+ buf[3] = 0xff;
+ addr = ntohl(naddr);
+ buf[4] = 0xff;
+ buf[5] = 0x10 | scope; /* scope from broadcast address */
+ buf[6] = 0x40; /* IPv4 signature */
+ buf[7] = 0x1b;
+ buf[8] = broadcast[8]; /* P_Key */
+ buf[9] = broadcast[9];
+ buf[10] = 0;
+ buf[11] = 0;
+ buf[12] = 0;
+ buf[13] = 0;
+ buf[14] = 0;
+ buf[15] = 0;
+ buf[19] = addr & 0xff;
+ addr >>= 8;
+ buf[18] = addr & 0xff;
+ addr >>= 8;
+ buf[17] = addr & 0xff;
+ addr >>= 8;
+ buf[16] = addr & 0x0f;
+}
+
+static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
+{
+ if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
+ memcpy(buf, broadcast, 4);
+ else
+ memcpy(buf, &naddr, sizeof(naddr));
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/ipv6.h>
+#endif
+
+static __inline__ void inet_reset_saddr(struct sock *sk)
+{
+ inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == PF_INET6) {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ memset(&np->saddr, 0, sizeof(np->saddr));
+ memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
+ }
+#endif
+}
+
+#endif
+
+static inline int sk_mc_loop(struct sock *sk)
+{
+ if (!sk)
+ return 1;
+ switch (sk->sk_family) {
+ case AF_INET:
+ return inet_sk(sk)->mc_loop;
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6:
+ return inet6_sk(sk)->mc_loop;
+#endif
+ }
+ WARN_ON(1);
+ return 1;
+}
+
+extern bool ip_call_ra_chain(struct sk_buff *skb);
+
+/*
+ * Functions provided by ip_fragment.c
+ */
+
+enum ip_defrag_users {
+ IP_DEFRAG_LOCAL_DELIVER,
+ IP_DEFRAG_CALL_RA_CHAIN,
+ IP_DEFRAG_CONNTRACK_IN,
+ __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
+ IP_DEFRAG_CONNTRACK_OUT,
+ __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
+ IP_DEFRAG_CONNTRACK_BRIDGE_IN,
+ __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
+ IP_DEFRAG_VS_IN,
+ IP_DEFRAG_VS_OUT,
+ IP_DEFRAG_VS_FWD,
+ IP_DEFRAG_AF_PACKET,
+ IP_DEFRAG_MACVLAN,
+};
+
+int ip_defrag(struct sk_buff *skb, u32 user);
+#ifdef CONFIG_INET
+struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
+#else
+static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
+{
+ return skb;
+}
+#endif
+int ip_frag_mem(struct net *net);
+int ip_frag_nqueues(struct net *net);
+
+/*
+ * Functions provided by ip_forward.c
+ */
+
+extern int ip_forward(struct sk_buff *skb);
+
+/*
+ * Functions provided by ip_options.c
+ */
+
+extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
+ __be32 daddr, struct rtable *rt, int is_frag);
+extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
+extern void ip_options_fragment(struct sk_buff *skb);
+extern int ip_options_compile(struct net *net,
+ struct ip_options *opt, struct sk_buff *skb);
+extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
+ unsigned char *data, int optlen);
+extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
+ unsigned char __user *data, int optlen);
+extern void ip_options_undo(struct ip_options * opt);
+extern void ip_forward_options(struct sk_buff *skb);
+extern int ip_options_rcv_srr(struct sk_buff *skb);
+
+/*
+ * Functions provided by ip_sockglue.c
+ */
+
+extern void ipv4_pktinfo_prepare(struct sk_buff *skb);
+extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
+extern int ip_cmsg_send(struct net *net,
+ struct msghdr *msg, struct ipcm_cookie *ipc);
+extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
+extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
+extern int compat_ip_setsockopt(struct sock *sk, int level,
+ int optname, char __user *optval, unsigned int optlen);
+extern int compat_ip_getsockopt(struct sock *sk, int level,
+ int optname, char __user *optval, int __user *optlen);
+extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
+
+extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
+extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
+ __be16 port, u32 info, u8 *payload);
+extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
+ u32 info);
+
+#ifdef CONFIG_PROC_FS
+extern int ip_misc_proc_init(void);
+#endif
+
+#endif /* _IP_H */
generated by cgit (git 2.34.1) at 2025-01-09 18:48:09 +0000