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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the IP module.
7 *
8 * Version: @(#)ip.h 1.0.2 05/07/93
9 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 *
14 * Changes:
15 * Mike McLagan : Routing by source
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22#ifndef _IP_H
23#define _IP_H
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/ip.h>
27#include <linux/in.h>
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030028#include <linux/skbuff.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020029
30#include <net/inet_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <net/snmp.h>
KOVACS Krisztian86b08d82008-10-01 07:44:42 -070032#include <net/flow.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34struct sock;
35
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000036struct inet_skb_parm {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 struct ip_options opt; /* Compiled IP options */
38 unsigned char flags;
39
Patrick McHardy8cdfab82006-01-06 23:04:01 -080040#define IPSKB_FORWARDED 1
41#define IPSKB_XFRM_TUNNEL_SIZE 2
Patrick McHardy3e3850e2006-01-06 23:04:54 -080042#define IPSKB_XFRM_TRANSFORMED 4
43#define IPSKB_FRAG_COMPLETE 8
Patrick McHardy48d5cad2006-02-15 15:10:22 -080044#define IPSKB_REROUTED 16
Linus Torvalds1da177e2005-04-16 15:20:36 -070045};
46
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030047static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
48{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070049 return ip_hdr(skb)->ihl * 4;
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030050}
51
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000052struct ipcm_cookie {
Al Viroc1d18f92006-09-27 18:28:28 -070053 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 int oif;
55 struct ip_options *opt;
Oliver Hartkopp2244d072010-08-17 08:59:14 +000056 __u8 tx_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057};
58
59#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
60
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000061struct ip_ra_chain {
Eric Dumazet43a951e2010-10-25 03:32:44 +000062 struct ip_ra_chain __rcu *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 struct sock *sk;
Eric Dumazet592fcb92010-06-09 16:21:07 +000064 union {
65 void (*destructor)(struct sock *);
66 struct sock *saved_sk;
67 };
Eric Dumazet66018502010-06-07 03:12:08 +000068 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069};
70
Eric Dumazet43a951e2010-10-25 03:32:44 +000071extern struct ip_ra_chain __rcu *ip_ra_chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73/* IP flags. */
74#define IP_CE 0x8000 /* Flag: "Congestion" */
75#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
76#define IP_MF 0x2000 /* Flag: "More Fragments" */
77#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
78
79#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
80
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020081struct msghdr;
82struct net_device;
83struct packet_type;
84struct rtable;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020085struct sockaddr;
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087extern int igmp_mc_proc_init(void);
88
89/*
90 * Functions provided by ip.c
91 */
92
93extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
Al Viro13d8eaa2006-09-26 22:27:30 -070094 __be32 saddr, __be32 daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct ip_options *opt);
96extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -070097 struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098extern int ip_local_deliver(struct sk_buff *skb);
99extern int ip_mr_input(struct sk_buff *skb);
100extern int ip_output(struct sk_buff *skb);
101extern int ip_mc_output(struct sk_buff *skb);
Patrick McHardy2e2f7ae2006-04-04 13:42:35 -0700102extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103extern int ip_do_nat(struct sk_buff *skb);
104extern void ip_send_check(struct iphdr *ip);
Herbert Xuc439cb22008-01-11 19:14:00 -0800105extern int __ip_local_out(struct sk_buff *skb);
106extern int ip_local_out(struct sk_buff *skb);
Shan Wei4e15ed42010-04-15 16:43:08 +0000107extern int ip_queue_xmit(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108extern void ip_init(void);
109extern int ip_append_data(struct sock *sk,
110 int getfrag(void *from, char *to, int offset, int len,
111 int odd, struct sk_buff *skb),
112 void *from, int len, int protolen,
113 struct ipcm_cookie *ipc,
Eric Dumazet2e77d892008-11-24 15:52:46 -0800114 struct rtable **rt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 unsigned int flags);
116extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
117extern ssize_t ip_append_page(struct sock *sk, struct page *page,
118 int offset, size_t size, int flags);
119extern int ip_push_pending_frames(struct sock *sk);
120extern void ip_flush_pending_frames(struct sock *sk);
121
122/* datagram.c */
123extern int ip4_datagram_connect(struct sock *sk,
124 struct sockaddr *uaddr, int addr_len);
125
126/*
127 * Map a multicast IP onto multicast MAC for type Token Ring.
128 * This conforms to RFC1469 Option 2 Multicasting i.e.
129 * using a functional address to transmit / receive
130 * multicast packets.
131 */
132
Al Viro714e85b2006-11-14 20:51:49 -0800133static inline void ip_tr_mc_map(__be32 addr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
135 buf[0]=0xC0;
136 buf[1]=0x00;
137 buf[2]=0x00;
138 buf[3]=0x04;
139 buf[4]=0x00;
140 buf[5]=0x00;
141}
142
143struct ip_reply_arg {
144 struct kvec iov[1];
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700145 int flags;
Al Virod6f54932006-11-14 21:26:08 -0800146 __wsum csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
148 /* -1 if not needed */
Patrick McHardyf0e48db2007-06-04 21:32:46 -0700149 int bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150};
151
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700152#define IP_REPLY_ARG_NOSRCCHECK 1
153
KOVACS Krisztian86b08d82008-10-01 07:44:42 -0700154static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
155{
156 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
157}
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
160 unsigned int len);
161
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000162struct ipv4_config {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 int log_martians;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 int no_pmtu_disc;
165};
166
167extern struct ipv4_config ipv4_config;
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700168#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
169#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
170#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
171#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
172#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
173#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -0700174#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
175#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
176#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
177#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
178#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Tejun Heo7d720c32010-02-16 15:20:26 +0000180extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700181#if BITS_PER_LONG==32
182extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
183#else
184static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
185{
186 return snmp_fold_field(mib, offt);
187}
188#endif
Eric Dumazet1823e4c82010-06-22 20:58:41 +0000189extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
Tejun Heo7d720c32010-02-16 15:20:26 +0000190extern void snmp_mib_free(void __percpu *ptr[2]);
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700191
Eric Dumazet3c689b72008-10-08 14:18:04 -0700192extern struct local_ports {
193 seqlock_t lock;
194 int range[2];
195} sysctl_local_ports;
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700196extern void inet_get_local_port_range(int *low, int *high);
197
Amerigo Wange3826f12010-05-05 00:27:06 +0000198extern unsigned long *sysctl_local_reserved_ports;
199static inline int inet_is_reserved_local_port(int port)
200{
201 return test_bit(port, sysctl_local_reserved_ports);
202}
203
Neil Hormancdac4e02005-06-13 15:12:33 -0700204extern int sysctl_ip_nonlocal_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Alexey Dobriyanb27aead2008-11-25 18:00:48 -0800206extern struct ctl_path net_core_path[];
Pavel Emelyanov3d7cc2b2008-01-09 00:33:11 -0800207extern struct ctl_path net_ipv4_ctl_path[];
208
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300209/* From inetpeer.c */
210extern int inet_peer_threshold;
211extern int inet_peer_minttl;
212extern int inet_peer_maxttl;
213extern int inet_peer_gc_mintime;
214extern int inet_peer_gc_maxtime;
215
216/* From ip_output.c */
217extern int sysctl_ip_dynaddr;
218
219extern void ipfrag_init(void);
220
Al Virobd7b1532008-07-15 16:00:59 -0400221extern void ip_static_sysctl_init(void);
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200224#include <net/dst.h>
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226/* The function in 2.2 was invalid, producing wrong result for
227 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
228static inline
229int ip_decrease_ttl(struct iphdr *iph)
230{
Al Viro5c78f272006-11-14 21:42:26 -0800231 u32 check = (__force u32)iph->check;
232 check += (__force u32)htons(0x0100);
233 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return --iph->ttl;
235}
236
237static inline
238int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
239{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000240 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
Eric Dumazeta02cec22010-09-22 20:43:57 +0000242 !(dst_metric_locked(dst, RTAX_MTU)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
245extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
246
247static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
248{
249 if (iph->frag_off & htons(IP_DF)) {
250 /* This is only to work around buggy Windows95/2000
251 * VJ compression implementations. If the ID field
252 * does not change, they drop every other packet in
253 * a TCP stream using header compression.
254 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000255 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
256 htons(inet_sk(sk)->inet_id++) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 } else
258 __ip_select_ident(iph, dst, 0);
259}
260
261static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
262{
263 if (iph->frag_off & htons(IP_DF)) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000264 if (sk && inet_sk(sk)->inet_daddr) {
265 iph->id = htons(inet_sk(sk)->inet_id);
266 inet_sk(sk)->inet_id += 1 + more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 } else
268 iph->id = 0;
269 } else
270 __ip_select_ident(iph, dst, more);
271}
272
273/*
274 * Map a multicast IP onto multicast MAC for type ethernet.
275 */
276
Al Viro714e85b2006-11-14 20:51:49 -0800277static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Al Viro714e85b2006-11-14 20:51:49 -0800279 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 buf[0]=0x01;
281 buf[1]=0x00;
282 buf[2]=0x5e;
283 buf[5]=addr&0xFF;
284 addr>>=8;
285 buf[4]=addr&0xFF;
286 addr>>=8;
287 buf[3]=addr&0x7F;
288}
289
290/*
291 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
292 * Leave P_Key as 0 to be filled in by driver.
293 */
294
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700295static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
Al Viro714e85b2006-11-14 20:51:49 -0800297 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700298 unsigned char scope = broadcast[5] & 0xF;
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 buf[0] = 0; /* Reserved */
301 buf[1] = 0xff; /* Multicast QPN */
302 buf[2] = 0xff;
303 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800304 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700306 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 buf[6] = 0x40; /* IPv4 signature */
308 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700309 buf[8] = broadcast[8]; /* P_Key */
310 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 buf[10] = 0;
312 buf[11] = 0;
313 buf[12] = 0;
314 buf[13] = 0;
315 buf[14] = 0;
316 buf[15] = 0;
317 buf[19] = addr & 0xff;
318 addr >>= 8;
319 buf[18] = addr & 0xff;
320 addr >>= 8;
321 buf[17] = addr & 0xff;
322 addr >>= 8;
323 buf[16] = addr & 0x0f;
324}
325
326#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
327#include <linux/ipv6.h>
328#endif
329
330static __inline__ void inet_reset_saddr(struct sock *sk)
331{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000332 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
334 if (sk->sk_family == PF_INET6) {
335 struct ipv6_pinfo *np = inet6_sk(sk);
336
337 memset(&np->saddr, 0, sizeof(np->saddr));
338 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
339 }
340#endif
341}
342
343#endif
344
Octavian Purdila7ad68482010-01-06 20:37:01 -0800345static inline int sk_mc_loop(struct sock *sk)
346{
347 if (!sk)
348 return 1;
349 switch (sk->sk_family) {
350 case AF_INET:
351 return inet_sk(sk)->mc_loop;
352#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
353 case AF_INET6:
354 return inet6_sk(sk)->mc_loop;
355#endif
356 }
Octavian Purdilacd65c3c2010-01-13 18:10:36 -0800357 WARN_ON(1);
Octavian Purdila7ad68482010-01-06 20:37:01 -0800358 return 1;
359}
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361extern int ip_call_ra_chain(struct sk_buff *skb);
362
363/*
Rami Rosenb7982322008-01-01 21:13:09 -0800364 * Functions provided by ip_fragment.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 */
366
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000367enum ip_defrag_users {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 IP_DEFRAG_LOCAL_DELIVER,
369 IP_DEFRAG_CALL_RA_CHAIN,
370 IP_DEFRAG_CONNTRACK_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700371 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 IP_DEFRAG_CONNTRACK_OUT,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700373 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
Patrick McHardy8fa9ff62009-12-15 16:59:59 +0100374 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700375 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 IP_DEFRAG_VS_IN,
377 IP_DEFRAG_VS_OUT,
378 IP_DEFRAG_VS_FWD
379};
380
Herbert Xu776c7292007-10-14 00:38:32 -0700381int ip_defrag(struct sk_buff *skb, u32 user);
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800382int ip_frag_mem(struct net *net);
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -0800383int ip_frag_nqueues(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385/*
386 * Functions provided by ip_forward.c
387 */
388
389extern int ip_forward(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391/*
392 * Functions provided by ip_options.c
393 */
394
Al Viro8712f772006-09-26 22:27:05 -0700395extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
397extern void ip_options_fragment(struct sk_buff *skb);
Denis V. Lunev0e6bd4a2008-03-24 15:29:23 -0700398extern int ip_options_compile(struct net *net,
399 struct ip_options *opt, struct sk_buff *skb);
Denis V. Lunevf2c48022008-03-24 15:29:55 -0700400extern int ip_options_get(struct net *net, struct ip_options **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300401 unsigned char *data, int optlen);
Denis V. Lunevf2c48022008-03-24 15:29:55 -0700402extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300403 unsigned char __user *data, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404extern void ip_options_undo(struct ip_options * opt);
405extern void ip_forward_options(struct sk_buff *skb);
406extern int ip_options_rcv_srr(struct sk_buff *skb);
407
408/*
409 * Functions provided by ip_sockglue.c
410 */
411
Eric Dumazetf84af322010-04-28 15:31:51 -0700412extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
Denis V. Lunev7a6adb92008-03-24 15:30:27 -0700414extern int ip_cmsg_send(struct net *net,
415 struct msghdr *msg, struct ipcm_cookie *ipc);
David S. Millerb7058842009-09-30 16:12:20 -0700416extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800418extern int compat_ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -0700419 int optname, char __user *optval, unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800420extern int compat_ip_getsockopt(struct sock *sk, int level,
421 int optname, char __user *optval, int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
423
424extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
425extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700426 __be16 port, u32 info, u8 *payload);
Al Viro05790162006-09-27 18:33:40 -0700427extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 u32 info);
429
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300430#ifdef CONFIG_PROC_FS
431extern int ip_misc_proc_init(void);
432#endif
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434#endif /* _IP_H */