blob: 775009f9eaba4870b8bcd3b83a4eb67af889b772 [file] [log] [blame]
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;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +000055 struct ip_options_rcu *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,
Eric Dumazetf6d8bd02011-04-21 09:45:37 +000095 struct ip_options_rcu *opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096extern 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);
David S. Millerd9d8da82011-05-06 22:23:20 -0700107extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108extern void ip_init(void);
David S. Millerf5fca602011-05-08 17:24:10 -0700109extern int ip_append_data(struct sock *sk, struct flowi4 *fl4,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 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);
David S. Millerf5fca602011-05-08 17:24:10 -0700117extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 int offset, size_t size, int flags);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000119extern struct sk_buff *__ip_make_skb(struct sock *sk,
David S. Miller77968b72011-05-08 17:12:19 -0700120 struct flowi4 *fl4,
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000121 struct sk_buff_head *queue,
122 struct inet_cork *cork);
123extern int ip_send_skb(struct sk_buff *skb);
David S. Miller77968b72011-05-08 17:12:19 -0700124extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125extern void ip_flush_pending_frames(struct sock *sk);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000126extern struct sk_buff *ip_make_skb(struct sock *sk,
David S. Miller77968b72011-05-08 17:12:19 -0700127 struct flowi4 *fl4,
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000128 int getfrag(void *from, char *to, int offset, int len,
129 int odd, struct sk_buff *skb),
130 void *from, int length, int transhdrlen,
131 struct ipcm_cookie *ipc,
132 struct rtable **rtp,
133 unsigned int flags);
134
David S. Miller77968b72011-05-08 17:12:19 -0700135static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000136{
David S. Miller77968b72011-05-08 17:12:19 -0700137 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000138}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140/* datagram.c */
141extern int ip4_datagram_connect(struct sock *sk,
142 struct sockaddr *uaddr, int addr_len);
143
144/*
145 * Map a multicast IP onto multicast MAC for type Token Ring.
146 * This conforms to RFC1469 Option 2 Multicasting i.e.
147 * using a functional address to transmit / receive
148 * multicast packets.
149 */
150
Al Viro714e85b2006-11-14 20:51:49 -0800151static inline void ip_tr_mc_map(__be32 addr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 buf[0]=0xC0;
154 buf[1]=0x00;
155 buf[2]=0x00;
156 buf[3]=0x04;
157 buf[4]=0x00;
158 buf[5]=0x00;
159}
160
161struct ip_reply_arg {
162 struct kvec iov[1];
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700163 int flags;
Al Virod6f5493c2006-11-14 21:26:08 -0800164 __wsum csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
166 /* -1 if not needed */
Patrick McHardyf0e48db2007-06-04 21:32:46 -0700167 int bound_dev_if;
Eric Dumazet66b13d92011-10-24 03:06:21 -0400168 u8 tos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169};
170
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700171#define IP_REPLY_ARG_NOSRCCHECK 1
172
KOVACS Krisztian86b08d82008-10-01 07:44:42 -0700173static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
174{
175 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
176}
177
David S. Miller0a5ebb82011-05-09 13:22:43 -0700178void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,
Eric Dumazet66b13d92011-10-24 03:06:21 -0400179 const struct ip_reply_arg *arg, unsigned int len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000181struct ipv4_config {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 int log_martians;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 int no_pmtu_disc;
184};
185
186extern struct ipv4_config ipv4_config;
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700187#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
188#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
189#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
190#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
191#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
192#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 -0700193#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
194#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
195#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
196#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
197#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 -0700198
Tejun Heo7d720c32010-02-16 15:20:26 +0000199extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700200#if BITS_PER_LONG==32
201extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
202#else
203static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
204{
205 return snmp_fold_field(mib, offt);
206}
207#endif
Eric Dumazet1823e4c82010-06-22 20:58:41 +0000208extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
Tejun Heo7d720c32010-02-16 15:20:26 +0000209extern void snmp_mib_free(void __percpu *ptr[2]);
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700210
Eric Dumazet3c689b72008-10-08 14:18:04 -0700211extern struct local_ports {
212 seqlock_t lock;
213 int range[2];
214} sysctl_local_ports;
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700215extern void inet_get_local_port_range(int *low, int *high);
216
Amerigo Wange3826f12010-05-05 00:27:06 +0000217extern unsigned long *sysctl_local_reserved_ports;
218static inline int inet_is_reserved_local_port(int port)
219{
220 return test_bit(port, sysctl_local_reserved_ports);
221}
222
Neil Hormancdac4e02005-06-13 15:12:33 -0700223extern int sysctl_ip_nonlocal_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Alexey Dobriyanb27aead2008-11-25 18:00:48 -0800225extern struct ctl_path net_core_path[];
Pavel Emelyanov3d7cc2b2008-01-09 00:33:11 -0800226extern struct ctl_path net_ipv4_ctl_path[];
227
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300228/* From inetpeer.c */
229extern int inet_peer_threshold;
230extern int inet_peer_minttl;
231extern int inet_peer_maxttl;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300232
233/* From ip_output.c */
234extern int sysctl_ip_dynaddr;
235
236extern void ipfrag_init(void);
237
Al Virobd7b1532008-07-15 16:00:59 -0400238extern void ip_static_sysctl_init(void);
239
David S. Millerd18cd552011-06-23 21:28:52 -0700240static inline bool ip_is_fragment(const struct iphdr *iph)
241{
242 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
243}
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200246#include <net/dst.h>
247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248/* The function in 2.2 was invalid, producing wrong result for
249 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
250static inline
251int ip_decrease_ttl(struct iphdr *iph)
252{
Al Viro5c78f272006-11-14 21:42:26 -0800253 u32 check = (__force u32)iph->check;
254 check += (__force u32)htons(0x0100);
255 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 return --iph->ttl;
257}
258
259static inline
260int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
261{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000262 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
Eric Dumazeta02cec22010-09-22 20:43:57 +0000264 !(dst_metric_locked(dst, RTAX_MTU)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
267extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
268
269static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
270{
271 if (iph->frag_off & htons(IP_DF)) {
272 /* This is only to work around buggy Windows95/2000
273 * VJ compression implementations. If the ID field
274 * does not change, they drop every other packet in
275 * a TCP stream using header compression.
276 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000277 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
278 htons(inet_sk(sk)->inet_id++) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 } else
280 __ip_select_ident(iph, dst, 0);
281}
282
283static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
284{
285 if (iph->frag_off & htons(IP_DF)) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000286 if (sk && inet_sk(sk)->inet_daddr) {
287 iph->id = htons(inet_sk(sk)->inet_id);
288 inet_sk(sk)->inet_id += 1 + more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 } else
290 iph->id = 0;
291 } else
292 __ip_select_ident(iph, dst, more);
293}
294
295/*
296 * Map a multicast IP onto multicast MAC for type ethernet.
297 */
298
Al Viro714e85b2006-11-14 20:51:49 -0800299static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Al Viro714e85b2006-11-14 20:51:49 -0800301 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 buf[0]=0x01;
303 buf[1]=0x00;
304 buf[2]=0x5e;
305 buf[5]=addr&0xFF;
306 addr>>=8;
307 buf[4]=addr&0xFF;
308 addr>>=8;
309 buf[3]=addr&0x7F;
310}
311
312/*
313 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
314 * Leave P_Key as 0 to be filled in by driver.
315 */
316
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700317static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
Al Viro714e85b2006-11-14 20:51:49 -0800319 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700320 unsigned char scope = broadcast[5] & 0xF;
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 buf[0] = 0; /* Reserved */
323 buf[1] = 0xff; /* Multicast QPN */
324 buf[2] = 0xff;
325 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800326 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700328 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 buf[6] = 0x40; /* IPv4 signature */
330 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700331 buf[8] = broadcast[8]; /* P_Key */
332 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 buf[10] = 0;
334 buf[11] = 0;
335 buf[12] = 0;
336 buf[13] = 0;
337 buf[14] = 0;
338 buf[15] = 0;
339 buf[19] = addr & 0xff;
340 addr >>= 8;
341 buf[18] = addr & 0xff;
342 addr >>= 8;
343 buf[17] = addr & 0xff;
344 addr >>= 8;
345 buf[16] = addr & 0x0f;
346}
347
Timo Teräs93ca3bb2011-03-28 22:40:53 +0000348static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
349{
350 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
351 memcpy(buf, broadcast, 4);
352 else
353 memcpy(buf, &naddr, sizeof(naddr));
354}
355
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000356#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357#include <linux/ipv6.h>
358#endif
359
360static __inline__ void inet_reset_saddr(struct sock *sk)
361{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000362 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000363#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 if (sk->sk_family == PF_INET6) {
365 struct ipv6_pinfo *np = inet6_sk(sk);
366
367 memset(&np->saddr, 0, sizeof(np->saddr));
368 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
369 }
370#endif
371}
372
373#endif
374
Octavian Purdila7ad68482010-01-06 20:37:01 -0800375static inline int sk_mc_loop(struct sock *sk)
376{
377 if (!sk)
378 return 1;
379 switch (sk->sk_family) {
380 case AF_INET:
381 return inet_sk(sk)->mc_loop;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000382#if IS_ENABLED(CONFIG_IPV6)
Octavian Purdila7ad68482010-01-06 20:37:01 -0800383 case AF_INET6:
384 return inet6_sk(sk)->mc_loop;
385#endif
386 }
Octavian Purdilacd65c3c2010-01-13 18:10:36 -0800387 WARN_ON(1);
Octavian Purdila7ad68482010-01-06 20:37:01 -0800388 return 1;
389}
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391extern int ip_call_ra_chain(struct sk_buff *skb);
392
393/*
Rami Rosenb7982322008-01-01 21:13:09 -0800394 * Functions provided by ip_fragment.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 */
396
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000397enum ip_defrag_users {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 IP_DEFRAG_LOCAL_DELIVER,
399 IP_DEFRAG_CALL_RA_CHAIN,
400 IP_DEFRAG_CONNTRACK_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700401 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 IP_DEFRAG_CONNTRACK_OUT,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700403 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
Patrick McHardy8fa9ff62009-12-15 16:59:59 +0100404 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700405 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 IP_DEFRAG_VS_IN,
407 IP_DEFRAG_VS_OUT,
David S. Miller595fc712011-07-05 01:05:48 -0700408 IP_DEFRAG_VS_FWD,
409 IP_DEFRAG_AF_PACKET,
Eric Dumazetbc416d92011-10-06 10:28:31 +0000410 IP_DEFRAG_MACVLAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411};
412
Herbert Xu776c7292007-10-14 00:38:32 -0700413int ip_defrag(struct sk_buff *skb, u32 user);
Eric Dumazetbc416d92011-10-06 10:28:31 +0000414#ifdef CONFIG_INET
415struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
416#else
417static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
418{
419 return skb;
420}
421#endif
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800422int ip_frag_mem(struct net *net);
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800423int ip_frag_nqueues(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425/*
426 * Functions provided by ip_forward.c
427 */
428
429extern int ip_forward(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431/*
432 * Functions provided by ip_options.c
433 */
434
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000435extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
436 __be32 daddr, struct rtable *rt, int is_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
438extern void ip_options_fragment(struct sk_buff *skb);
Denis V. Lunev0e6bd4a2008-03-24 15:29:23 -0700439extern int ip_options_compile(struct net *net,
440 struct ip_options *opt, struct sk_buff *skb);
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000441extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300442 unsigned char *data, int optlen);
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000443extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300444 unsigned char __user *data, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445extern void ip_options_undo(struct ip_options * opt);
446extern void ip_forward_options(struct sk_buff *skb);
447extern int ip_options_rcv_srr(struct sk_buff *skb);
448
449/*
450 * Functions provided by ip_sockglue.c
451 */
452
Eric Dumazetd826eb12011-11-09 07:24:35 +0000453extern void ipv4_pktinfo_prepare(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
Denis V. Lunev7a6adb92008-03-24 15:30:27 -0700455extern int ip_cmsg_send(struct net *net,
456 struct msghdr *msg, struct ipcm_cookie *ipc);
David S. Millerb7058842009-09-30 16:12:20 -0700457extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800459extern int compat_ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -0700460 int optname, char __user *optval, unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800461extern int compat_ip_getsockopt(struct sock *sk, int level,
462 int optname, char __user *optval, int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
464
465extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
466extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700467 __be16 port, u32 info, u8 *payload);
Al Viro05790162006-09-27 18:33:40 -0700468extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 u32 info);
470
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300471#ifdef CONFIG_PROC_FS
472extern int ip_misc_proc_init(void);
473#endif
474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475#endif /* _IP_H */