blob: 10868139e656464dea5076e8b5672a9536b0ea01 [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
36struct inet_skb_parm
37{
38 struct ip_options opt; /* Compiled IP options */
39 unsigned char flags;
40
Patrick McHardy8cdfab82006-01-06 23:04:01 -080041#define IPSKB_FORWARDED 1
42#define IPSKB_XFRM_TUNNEL_SIZE 2
Patrick McHardy3e3850e2006-01-06 23:04:54 -080043#define IPSKB_XFRM_TRANSFORMED 4
44#define IPSKB_FRAG_COMPLETE 8
Patrick McHardy48d5cad2006-02-15 15:10:22 -080045#define IPSKB_REROUTED 16
Linus Torvalds1da177e2005-04-16 15:20:36 -070046};
47
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030048static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
49{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070050 return ip_hdr(skb)->ihl * 4;
Arnaldo Carvalho de Meloc9bdd4b2007-03-12 20:09:15 -030051}
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053struct ipcm_cookie
54{
Al Viroc1d18f92006-09-27 18:28:28 -070055 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 int oif;
57 struct ip_options *opt;
58};
59
60#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
61
62struct ip_ra_chain
63{
64 struct ip_ra_chain *next;
65 struct sock *sk;
66 void (*destructor)(struct sock *);
67};
68
69extern struct ip_ra_chain *ip_ra_chain;
70extern rwlock_t ip_ra_lock;
71
72/* IP flags. */
73#define IP_CE 0x8000 /* Flag: "Congestion" */
74#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
75#define IP_MF 0x2000 /* Flag: "More Fragments" */
76#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
77
78#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
79
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020080struct msghdr;
81struct net_device;
82struct packet_type;
83struct rtable;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020084struct sockaddr;
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086extern int igmp_mc_proc_init(void);
87
88/*
89 * Functions provided by ip.c
90 */
91
92extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
Al Viro13d8eaa2006-09-26 22:27:30 -070093 __be32 saddr, __be32 daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 struct ip_options *opt);
95extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -070096 struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097extern int ip_local_deliver(struct sk_buff *skb);
98extern int ip_mr_input(struct sk_buff *skb);
99extern int ip_output(struct sk_buff *skb);
100extern int ip_mc_output(struct sk_buff *skb);
Patrick McHardy2e2f7ae2006-04-04 13:42:35 -0700101extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102extern int ip_do_nat(struct sk_buff *skb);
103extern void ip_send_check(struct iphdr *ip);
Herbert Xuc439cb22008-01-11 19:14:00 -0800104extern int __ip_local_out(struct sk_buff *skb);
105extern int ip_local_out(struct sk_buff *skb);
David S. Millere89862f2007-01-26 01:04:55 -0800106extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107extern void ip_init(void);
108extern int ip_append_data(struct sock *sk,
109 int getfrag(void *from, char *to, int offset, int len,
110 int odd, struct sk_buff *skb),
111 void *from, int len, int protolen,
112 struct ipcm_cookie *ipc,
Eric Dumazet2e77d892008-11-24 15:52:46 -0800113 struct rtable **rt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 unsigned int flags);
115extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
116extern ssize_t ip_append_page(struct sock *sk, struct page *page,
117 int offset, size_t size, int flags);
118extern int ip_push_pending_frames(struct sock *sk);
119extern void ip_flush_pending_frames(struct sock *sk);
120
121/* datagram.c */
122extern int ip4_datagram_connect(struct sock *sk,
123 struct sockaddr *uaddr, int addr_len);
124
125/*
126 * Map a multicast IP onto multicast MAC for type Token Ring.
127 * This conforms to RFC1469 Option 2 Multicasting i.e.
128 * using a functional address to transmit / receive
129 * multicast packets.
130 */
131
Al Viro714e85b2006-11-14 20:51:49 -0800132static inline void ip_tr_mc_map(__be32 addr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
134 buf[0]=0xC0;
135 buf[1]=0x00;
136 buf[2]=0x00;
137 buf[3]=0x04;
138 buf[4]=0x00;
139 buf[5]=0x00;
140}
141
142struct ip_reply_arg {
143 struct kvec iov[1];
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700144 int flags;
Al Virod6f5493c2006-11-14 21:26:08 -0800145 __wsum csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
147 /* -1 if not needed */
Patrick McHardyf0e48db2007-06-04 21:32:46 -0700148 int bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149};
150
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700151#define IP_REPLY_ARG_NOSRCCHECK 1
152
KOVACS Krisztian86b08d82008-10-01 07:44:42 -0700153static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
154{
155 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
156}
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
159 unsigned int len);
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161struct ipv4_config
162{
163 int log_martians;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 int no_pmtu_disc;
165};
166
167extern struct ipv4_config ipv4_config;
Pavel Emelyanova20f5792008-07-18 04:02:42 -0700168#define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field)
169#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field)
170#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val)
Pavel Emelyanov61a7e262008-07-18 04:03:08 -0700171#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
172#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
173#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
174#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
175#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 -0700176
Herbert Xu5e0f0432007-04-24 21:53:35 -0700177extern unsigned long snmp_fold_field(void *mib[], int offt);
YOSHIFUJI Hideakic69bce22008-01-23 22:31:45 -0800178extern int snmp_mib_init(void *ptr[2], size_t mibsize);
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700179extern void snmp_mib_free(void *ptr[2]);
180
Eric Dumazet3c689b72008-10-08 14:18:04 -0700181extern struct local_ports {
182 seqlock_t lock;
183 int range[2];
184} sysctl_local_ports;
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700185extern void inet_get_local_port_range(int *low, int *high);
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187extern int sysctl_ip_default_ttl;
Neil Hormancdac4e02005-06-13 15:12:33 -0700188extern int sysctl_ip_nonlocal_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Alexey Dobriyanb27aead2008-11-25 18:00:48 -0800190extern struct ctl_path net_core_path[];
Pavel Emelyanov3d7cc2b2008-01-09 00:33:11 -0800191extern struct ctl_path net_ipv4_ctl_path[];
192
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300193/* From inetpeer.c */
194extern int inet_peer_threshold;
195extern int inet_peer_minttl;
196extern int inet_peer_maxttl;
197extern int inet_peer_gc_mintime;
198extern int inet_peer_gc_maxtime;
199
200/* From ip_output.c */
201extern int sysctl_ip_dynaddr;
202
203extern void ipfrag_init(void);
204
Al Virobd7b1532008-07-15 16:00:59 -0400205extern void ip_static_sysctl_init(void);
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200208#include <net/dst.h>
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210/* The function in 2.2 was invalid, producing wrong result for
211 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
212static inline
213int ip_decrease_ttl(struct iphdr *iph)
214{
Al Viro5c78f272006-11-14 21:42:26 -0800215 u32 check = (__force u32)iph->check;
216 check += (__force u32)htons(0x0100);
217 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 return --iph->ttl;
219}
220
221static inline
222int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
223{
224 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
225 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
Satoru SATOH0bbeafd2008-05-04 22:12:43 -0700226 !(dst_metric_locked(dst, RTAX_MTU))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
229extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
230
231static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
232{
233 if (iph->frag_off & htons(IP_DF)) {
234 /* This is only to work around buggy Windows95/2000
235 * VJ compression implementations. If the ID field
236 * does not change, they drop every other packet in
237 * a TCP stream using header compression.
238 */
239 iph->id = (sk && inet_sk(sk)->daddr) ?
240 htons(inet_sk(sk)->id++) : 0;
241 } else
242 __ip_select_ident(iph, dst, 0);
243}
244
245static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
246{
247 if (iph->frag_off & htons(IP_DF)) {
248 if (sk && inet_sk(sk)->daddr) {
249 iph->id = htons(inet_sk(sk)->id);
250 inet_sk(sk)->id += 1 + more;
251 } else
252 iph->id = 0;
253 } else
254 __ip_select_ident(iph, dst, more);
255}
256
257/*
258 * Map a multicast IP onto multicast MAC for type ethernet.
259 */
260
Al Viro714e85b2006-11-14 20:51:49 -0800261static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
Al Viro714e85b2006-11-14 20:51:49 -0800263 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 buf[0]=0x01;
265 buf[1]=0x00;
266 buf[2]=0x5e;
267 buf[5]=addr&0xFF;
268 addr>>=8;
269 buf[4]=addr&0xFF;
270 addr>>=8;
271 buf[3]=addr&0x7F;
272}
273
274/*
275 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
276 * Leave P_Key as 0 to be filled in by driver.
277 */
278
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700279static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Al Viro714e85b2006-11-14 20:51:49 -0800281 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700282 unsigned char scope = broadcast[5] & 0xF;
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 buf[0] = 0; /* Reserved */
285 buf[1] = 0xff; /* Multicast QPN */
286 buf[2] = 0xff;
287 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800288 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700290 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 buf[6] = 0x40; /* IPv4 signature */
292 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700293 buf[8] = broadcast[8]; /* P_Key */
294 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 buf[10] = 0;
296 buf[11] = 0;
297 buf[12] = 0;
298 buf[13] = 0;
299 buf[14] = 0;
300 buf[15] = 0;
301 buf[19] = addr & 0xff;
302 addr >>= 8;
303 buf[18] = addr & 0xff;
304 addr >>= 8;
305 buf[17] = addr & 0xff;
306 addr >>= 8;
307 buf[16] = addr & 0x0f;
308}
309
310#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
311#include <linux/ipv6.h>
312#endif
313
314static __inline__ void inet_reset_saddr(struct sock *sk)
315{
316 inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
317#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
318 if (sk->sk_family == PF_INET6) {
319 struct ipv6_pinfo *np = inet6_sk(sk);
320
321 memset(&np->saddr, 0, sizeof(np->saddr));
322 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
323 }
324#endif
325}
326
327#endif
328
329extern int ip_call_ra_chain(struct sk_buff *skb);
330
331/*
Rami Rosenb7982322008-01-01 21:13:09 -0800332 * Functions provided by ip_fragment.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 */
334
335enum ip_defrag_users
336{
337 IP_DEFRAG_LOCAL_DELIVER,
338 IP_DEFRAG_CALL_RA_CHAIN,
339 IP_DEFRAG_CONNTRACK_IN,
340 IP_DEFRAG_CONNTRACK_OUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 IP_DEFRAG_VS_IN,
342 IP_DEFRAG_VS_OUT,
343 IP_DEFRAG_VS_FWD
344};
345
Herbert Xu776c7292007-10-14 00:38:32 -0700346int ip_defrag(struct sk_buff *skb, u32 user);
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800347int ip_frag_mem(struct net *net);
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800348int ip_frag_nqueues(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350/*
351 * Functions provided by ip_forward.c
352 */
353
354extern int ip_forward(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356/*
357 * Functions provided by ip_options.c
358 */
359
Al Viro8712f772006-09-26 22:27:05 -0700360extern 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 -0700361extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
362extern void ip_options_fragment(struct sk_buff *skb);
Denis V. Lunev0e6bd4a2008-03-24 15:29:23 -0700363extern int ip_options_compile(struct net *net,
364 struct ip_options *opt, struct sk_buff *skb);
Denis V. Lunevf2c48022008-03-24 15:29:55 -0700365extern int ip_options_get(struct net *net, struct ip_options **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300366 unsigned char *data, int optlen);
Denis V. Lunevf2c48022008-03-24 15:29:55 -0700367extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300368 unsigned char __user *data, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369extern void ip_options_undo(struct ip_options * opt);
370extern void ip_forward_options(struct sk_buff *skb);
371extern int ip_options_rcv_srr(struct sk_buff *skb);
372
373/*
374 * Functions provided by ip_sockglue.c
375 */
376
377extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
Denis V. Lunev7a6adb92008-03-24 15:30:27 -0700378extern int ip_cmsg_send(struct net *net,
379 struct msghdr *msg, struct ipcm_cookie *ipc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
381extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800382extern int compat_ip_setsockopt(struct sock *sk, int level,
383 int optname, char __user *optval, int optlen);
384extern int compat_ip_getsockopt(struct sock *sk, int level,
385 int optname, char __user *optval, int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
387
388extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
389extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700390 __be16 port, u32 info, u8 *payload);
Al Viro05790162006-09-27 18:33:40 -0700391extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 u32 info);
393
394/* sysctl helpers - any sysctl which holds a value that ends up being
395 * fed into the routing cache should use these handlers.
396 */
397int ipv4_doint_and_flush(ctl_table *ctl, int write,
398 struct file* filp, void __user *buffer,
399 size_t *lenp, loff_t *ppos);
Alexey Dobriyanf221e722008-10-15 22:04:23 -0700400int ipv4_doint_and_flush_strategy(ctl_table *table,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 void __user *oldval, size_t __user *oldlenp,
Alexey Dobriyan1f29bcd2006-12-10 02:19:10 -0800402 void __user *newval, size_t newlen);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300403#ifdef CONFIG_PROC_FS
404extern int ip_misc_proc_init(void);
405#endif
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407#endif /* _IP_H */