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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
Patrick McHardy5f2d04f2012-08-26 19:13:55 +020045
46 u16 frag_max_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047};
48
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030049static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
50{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070051 return ip_hdr(skb)->ihl * 4;
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030052}
53
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000054struct ipcm_cookie {
Al Viroc1d18f92006-09-27 18:28:28 -070055 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 int oif;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +000057 struct ip_options_rcu *opt;
Oliver Hartkopp2244d072010-08-17 08:59:14 +000058 __u8 tx_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059};
60
61#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
62
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000063struct ip_ra_chain {
Eric Dumazet43a951e2010-10-25 03:32:44 +000064 struct ip_ra_chain __rcu *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 struct sock *sk;
Eric Dumazet592fcb92010-06-09 16:21:07 +000066 union {
67 void (*destructor)(struct sock *);
68 struct sock *saved_sk;
69 };
Eric Dumazet66018502010-06-07 03:12:08 +000070 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
Eric Dumazet43a951e2010-10-25 03:32:44 +000073extern struct ip_ra_chain __rcu *ip_ra_chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75/* IP flags. */
76#define IP_CE 0x8000 /* Flag: "Congestion" */
77#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
78#define IP_MF 0x2000 /* Flag: "More Fragments" */
79#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
80
81#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
82
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020083struct msghdr;
84struct net_device;
85struct packet_type;
86struct rtable;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020087struct sockaddr;
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089extern int igmp_mc_proc_init(void);
90
91/*
92 * Functions provided by ip.c
93 */
94
95extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
Al Viro13d8eaa2006-09-26 22:27:30 -070096 __be32 saddr, __be32 daddr,
Eric Dumazetf6d8bd02011-04-21 09:45:37 +000097 struct ip_options_rcu *opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -070099 struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100extern int ip_local_deliver(struct sk_buff *skb);
101extern int ip_mr_input(struct sk_buff *skb);
102extern int ip_output(struct sk_buff *skb);
103extern int ip_mc_output(struct sk_buff *skb);
Patrick McHardy2e2f7ae2006-04-04 13:42:35 -0700104extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105extern int ip_do_nat(struct sk_buff *skb);
106extern void ip_send_check(struct iphdr *ip);
Herbert Xuc439cb22008-01-11 19:14:00 -0800107extern int __ip_local_out(struct sk_buff *skb);
108extern int ip_local_out(struct sk_buff *skb);
David S. Millerd9d8da82011-05-06 22:23:20 -0700109extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110extern void ip_init(void);
David S. Millerf5fca602011-05-08 17:24:10 -0700111extern int ip_append_data(struct sock *sk, struct flowi4 *fl4,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 int getfrag(void *from, char *to, int offset, int len,
113 int odd, struct sk_buff *skb),
114 void *from, int len, int protolen,
115 struct ipcm_cookie *ipc,
Eric Dumazet2e77d892008-11-24 15:52:46 -0800116 struct rtable **rt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 unsigned int flags);
118extern 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 -0700119extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 int offset, size_t size, int flags);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000121extern struct sk_buff *__ip_make_skb(struct sock *sk,
David S. Miller77968b72011-05-08 17:12:19 -0700122 struct flowi4 *fl4,
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000123 struct sk_buff_head *queue,
124 struct inet_cork *cork);
Eric Dumazetb5ec8ee2012-08-10 02:22:47 +0000125extern int ip_send_skb(struct net *net, struct sk_buff *skb);
David S. Miller77968b72011-05-08 17:12:19 -0700126extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127extern void ip_flush_pending_frames(struct sock *sk);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000128extern struct sk_buff *ip_make_skb(struct sock *sk,
David S. Miller77968b72011-05-08 17:12:19 -0700129 struct flowi4 *fl4,
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000130 int getfrag(void *from, char *to, int offset, int len,
131 int odd, struct sk_buff *skb),
132 void *from, int length, int transhdrlen,
133 struct ipcm_cookie *ipc,
134 struct rtable **rtp,
135 unsigned int flags);
136
David S. Miller77968b72011-05-08 17:12:19 -0700137static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000138{
David S. Miller77968b72011-05-08 17:12:19 -0700139 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
Herbert Xu1c32c5a2011-03-01 02:36:47 +0000140}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142/* datagram.c */
143extern int ip4_datagram_connect(struct sock *sk,
144 struct sockaddr *uaddr, int addr_len);
145
Steffen Klassert8141ed92013-01-21 02:00:03 +0000146extern void ip4_datagram_release_cb(struct sock *sk);
147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148struct ip_reply_arg {
149 struct kvec iov[1];
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700150 int flags;
Al Virod6f5493c2006-11-14 21:26:08 -0800151 __wsum csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
153 /* -1 if not needed */
Patrick McHardyf0e48db2007-06-04 21:32:46 -0700154 int bound_dev_if;
Eric Dumazet66b13d92011-10-24 03:06:21 -0400155 u8 tos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156};
157
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700158#define IP_REPLY_ARG_NOSRCCHECK 1
159
KOVACS Krisztian86b08d82008-10-01 07:44:42 -0700160static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
161{
162 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
163}
164
Eric Dumazetbe9f4a42012-07-19 07:34:03 +0000165void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
David S. Miller70e73412012-06-28 03:21:41 -0700166 __be32 saddr, const struct ip_reply_arg *arg,
167 unsigned int len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000169struct ipv4_config {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 int log_martians;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 int no_pmtu_disc;
172};
173
174extern struct ipv4_config ipv4_config;
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700175#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
176#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
177#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
178#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
179#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
180#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 -0700181#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
182#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
183#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
184#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
185#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 -0700186
Tejun Heo7d720c32010-02-16 15:20:26 +0000187extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
Eric Dumazet4ce3c182010-06-30 13:31:19 -0700188#if BITS_PER_LONG==32
189extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
190#else
191static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
192{
193 return snmp_fold_field(mib, offt);
194}
195#endif
Eric Dumazet1823e4c82010-06-22 20:58:41 +0000196extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
Tejun Heo7d720c32010-02-16 15:20:26 +0000197extern void snmp_mib_free(void __percpu *ptr[2]);
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700198
Eric Dumazet3c689b72008-10-08 14:18:04 -0700199extern struct local_ports {
200 seqlock_t lock;
201 int range[2];
202} sysctl_local_ports;
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700203extern void inet_get_local_port_range(int *low, int *high);
204
Amerigo Wange3826f12010-05-05 00:27:06 +0000205extern unsigned long *sysctl_local_reserved_ports;
206static inline int inet_is_reserved_local_port(int port)
207{
208 return test_bit(port, sysctl_local_reserved_ports);
209}
210
Neil Hormancdac4e02005-06-13 15:12:33 -0700211extern int sysctl_ip_nonlocal_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300213/* From inetpeer.c */
214extern int inet_peer_threshold;
215extern int inet_peer_minttl;
216extern int inet_peer_maxttl;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300217
Alexander Duyck6648bd72012-06-21 13:58:31 +0000218/* From ip_input.c */
219extern int sysctl_ip_early_demux;
220
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300221/* From ip_output.c */
222extern int sysctl_ip_dynaddr;
223
224extern void ipfrag_init(void);
225
Al Virobd7b1532008-07-15 16:00:59 -0400226extern void ip_static_sysctl_init(void);
227
David S. Millerd18cd552011-06-23 21:28:52 -0700228static inline bool ip_is_fragment(const struct iphdr *iph)
229{
230 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
231}
232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200234#include <net/dst.h>
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236/* The function in 2.2 was invalid, producing wrong result for
237 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
238static inline
239int ip_decrease_ttl(struct iphdr *iph)
240{
Al Viro5c78f272006-11-14 21:42:26 -0800241 u32 check = (__force u32)iph->check;
242 check += (__force u32)htons(0x0100);
243 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return --iph->ttl;
245}
246
247static inline
248int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
249{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000250 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
Eric Dumazeta02cec22010-09-22 20:43:57 +0000252 !(dst_metric_locked(dst, RTAX_MTU)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
256
257static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
258{
259 if (iph->frag_off & htons(IP_DF)) {
260 /* This is only to work around buggy Windows95/2000
261 * VJ compression implementations. If the ID field
262 * does not change, they drop every other packet in
263 * a TCP stream using header compression.
264 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000265 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
266 htons(inet_sk(sk)->inet_id++) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 } else
268 __ip_select_ident(iph, dst, 0);
269}
270
271static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
272{
273 if (iph->frag_off & htons(IP_DF)) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000274 if (sk && inet_sk(sk)->inet_daddr) {
275 iph->id = htons(inet_sk(sk)->inet_id);
276 inet_sk(sk)->inet_id += 1 + more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 } else
278 iph->id = 0;
279 } else
280 __ip_select_ident(iph, dst, more);
281}
282
283/*
284 * Map a multicast IP onto multicast MAC for type ethernet.
285 */
286
Al Viro714e85b2006-11-14 20:51:49 -0800287static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Al Viro714e85b2006-11-14 20:51:49 -0800289 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 buf[0]=0x01;
291 buf[1]=0x00;
292 buf[2]=0x5e;
293 buf[5]=addr&0xFF;
294 addr>>=8;
295 buf[4]=addr&0xFF;
296 addr>>=8;
297 buf[3]=addr&0x7F;
298}
299
300/*
301 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
302 * Leave P_Key as 0 to be filled in by driver.
303 */
304
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700305static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
Al Viro714e85b2006-11-14 20:51:49 -0800307 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700308 unsigned char scope = broadcast[5] & 0xF;
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 buf[0] = 0; /* Reserved */
311 buf[1] = 0xff; /* Multicast QPN */
312 buf[2] = 0xff;
313 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800314 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700316 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 buf[6] = 0x40; /* IPv4 signature */
318 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700319 buf[8] = broadcast[8]; /* P_Key */
320 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 buf[10] = 0;
322 buf[11] = 0;
323 buf[12] = 0;
324 buf[13] = 0;
325 buf[14] = 0;
326 buf[15] = 0;
327 buf[19] = addr & 0xff;
328 addr >>= 8;
329 buf[18] = addr & 0xff;
330 addr >>= 8;
331 buf[17] = addr & 0xff;
332 addr >>= 8;
333 buf[16] = addr & 0x0f;
334}
335
Timo Teräs93ca3bb2011-03-28 22:40:53 +0000336static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
337{
338 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
339 memcpy(buf, broadcast, 4);
340 else
341 memcpy(buf, &naddr, sizeof(naddr));
342}
343
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000344#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345#include <linux/ipv6.h>
346#endif
347
348static __inline__ void inet_reset_saddr(struct sock *sk)
349{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000350 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000351#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 if (sk->sk_family == PF_INET6) {
353 struct ipv6_pinfo *np = inet6_sk(sk);
354
355 memset(&np->saddr, 0, sizeof(np->saddr));
356 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
357 }
358#endif
359}
360
361#endif
362
Octavian Purdila7ad68482010-01-06 20:37:01 -0800363static inline int sk_mc_loop(struct sock *sk)
364{
365 if (!sk)
366 return 1;
367 switch (sk->sk_family) {
368 case AF_INET:
369 return inet_sk(sk)->mc_loop;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000370#if IS_ENABLED(CONFIG_IPV6)
Octavian Purdila7ad68482010-01-06 20:37:01 -0800371 case AF_INET6:
372 return inet6_sk(sk)->mc_loop;
373#endif
374 }
Octavian Purdilacd65c3c2010-01-13 18:10:36 -0800375 WARN_ON(1);
Octavian Purdila7ad68482010-01-06 20:37:01 -0800376 return 1;
377}
378
David S. Millerba57b4d2012-03-07 20:45:32 -0500379extern bool ip_call_ra_chain(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381/*
Rami Rosenb7982322008-01-01 21:13:09 -0800382 * Functions provided by ip_fragment.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 */
384
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000385enum ip_defrag_users {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 IP_DEFRAG_LOCAL_DELIVER,
387 IP_DEFRAG_CALL_RA_CHAIN,
388 IP_DEFRAG_CONNTRACK_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700389 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 IP_DEFRAG_CONNTRACK_OUT,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700391 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
Patrick McHardy8fa9ff62009-12-15 16:59:59 +0100392 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700393 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 IP_DEFRAG_VS_IN,
395 IP_DEFRAG_VS_OUT,
David S. Miller595fc712011-07-05 01:05:48 -0700396 IP_DEFRAG_VS_FWD,
397 IP_DEFRAG_AF_PACKET,
Eric Dumazetbc416d92011-10-06 10:28:31 +0000398 IP_DEFRAG_MACVLAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399};
400
Herbert Xu776c7292007-10-14 00:38:32 -0700401int ip_defrag(struct sk_buff *skb, u32 user);
Eric Dumazetbc416d92011-10-06 10:28:31 +0000402#ifdef CONFIG_INET
403struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
404#else
405static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
406{
407 return skb;
408}
409#endif
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800410int ip_frag_mem(struct net *net);
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800411int ip_frag_nqueues(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
413/*
414 * Functions provided by ip_forward.c
415 */
416
417extern int ip_forward(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419/*
420 * Functions provided by ip_options.c
421 */
422
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000423extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
424 __be32 daddr, struct rtable *rt, int is_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
426extern void ip_options_fragment(struct sk_buff *skb);
Denis V. Lunev0e6bd4a2008-03-24 15:29:23 -0700427extern int ip_options_compile(struct net *net,
428 struct ip_options *opt, struct sk_buff *skb);
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000429extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300430 unsigned char *data, int optlen);
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000431extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300432 unsigned char __user *data, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433extern void ip_options_undo(struct ip_options * opt);
434extern void ip_forward_options(struct sk_buff *skb);
435extern int ip_options_rcv_srr(struct sk_buff *skb);
436
437/*
438 * Functions provided by ip_sockglue.c
439 */
440
Eric Dumazetd826eb12011-11-09 07:24:35 +0000441extern void ipv4_pktinfo_prepare(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
Denis V. Lunev7a6adb92008-03-24 15:30:27 -0700443extern int ip_cmsg_send(struct net *net,
444 struct msghdr *msg, struct ipcm_cookie *ipc);
David S. Millerb7058842009-09-30 16:12:20 -0700445extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800447extern int compat_ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -0700448 int optname, char __user *optval, unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800449extern int compat_ip_getsockopt(struct sock *sk, int level,
450 int optname, char __user *optval, int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
452
453extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
454extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700455 __be16 port, u32 info, u8 *payload);
Al Viro05790162006-09-27 18:33:40 -0700456extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 u32 info);
458
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300459#ifdef CONFIG_PROC_FS
460extern int ip_misc_proc_init(void);
461#endif
462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463#endif /* _IP_H */