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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>
32
33struct sock;
34
35struct inet_skb_parm
36{
37 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070052struct ipcm_cookie
53{
Al Viroc1d18f92006-09-27 18:28:28 -070054 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 int oif;
56 struct ip_options *opt;
57};
58
59#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
60
61struct ip_ra_chain
62{
63 struct ip_ra_chain *next;
64 struct sock *sk;
65 void (*destructor)(struct sock *);
66};
67
68extern struct ip_ra_chain *ip_ra_chain;
69extern rwlock_t ip_ra_lock;
70
71/* IP flags. */
72#define IP_CE 0x8000 /* Flag: "Congestion" */
73#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
74#define IP_MF 0x2000 /* Flag: "More Fragments" */
75#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
76
77#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
78
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020079struct msghdr;
80struct net_device;
81struct packet_type;
82struct rtable;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020083struct sockaddr;
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085extern int igmp_mc_proc_init(void);
86
87/*
88 * Functions provided by ip.c
89 */
90
91extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
Al Viro13d8eaa2006-09-26 22:27:30 -070092 __be32 saddr, __be32 daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 struct ip_options *opt);
94extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -070095 struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096extern int ip_local_deliver(struct sk_buff *skb);
97extern int ip_mr_input(struct sk_buff *skb);
98extern int ip_output(struct sk_buff *skb);
99extern int ip_mc_output(struct sk_buff *skb);
Patrick McHardy2e2f7ae2006-04-04 13:42:35 -0700100extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101extern int ip_do_nat(struct sk_buff *skb);
102extern void ip_send_check(struct iphdr *ip);
Herbert Xuc439cb22008-01-11 19:14:00 -0800103extern int __ip_local_out(struct sk_buff *skb);
104extern int ip_local_out(struct sk_buff *skb);
David S. Millere89862f2007-01-26 01:04:55 -0800105extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106extern void ip_init(void);
107extern int ip_append_data(struct sock *sk,
108 int getfrag(void *from, char *to, int offset, int len,
109 int odd, struct sk_buff *skb),
110 void *from, int len, int protolen,
111 struct ipcm_cookie *ipc,
112 struct rtable *rt,
113 unsigned int flags);
114extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
115extern ssize_t ip_append_page(struct sock *sk, struct page *page,
116 int offset, size_t size, int flags);
117extern int ip_push_pending_frames(struct sock *sk);
118extern void ip_flush_pending_frames(struct sock *sk);
119
120/* datagram.c */
121extern int ip4_datagram_connect(struct sock *sk,
122 struct sockaddr *uaddr, int addr_len);
123
124/*
125 * Map a multicast IP onto multicast MAC for type Token Ring.
126 * This conforms to RFC1469 Option 2 Multicasting i.e.
127 * using a functional address to transmit / receive
128 * multicast packets.
129 */
130
Al Viro714e85b2006-11-14 20:51:49 -0800131static inline void ip_tr_mc_map(__be32 addr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
133 buf[0]=0xC0;
134 buf[1]=0x00;
135 buf[2]=0x00;
136 buf[3]=0x04;
137 buf[4]=0x00;
138 buf[5]=0x00;
139}
140
141struct ip_reply_arg {
142 struct kvec iov[1];
Al Virod6f5493c2006-11-14 21:26:08 -0800143 __wsum csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
145 /* -1 if not needed */
Patrick McHardyf0e48db2007-06-04 21:32:46 -0700146 int bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147};
148
149void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
150 unsigned int len);
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152struct ipv4_config
153{
154 int log_martians;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 int no_pmtu_disc;
156};
157
158extern struct ipv4_config ipv4_config;
159DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics);
160#define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field)
161#define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field)
162#define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field)
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700163#define IP_ADD_STATS_BH(field, val) SNMP_ADD_STATS_BH(ip_statistics, field, val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164DECLARE_SNMP_STAT(struct linux_mib, net_statistics);
165#define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field)
166#define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field)
167#define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field)
168#define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd)
169#define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd)
170
Herbert Xu5e0f0432007-04-24 21:53:35 -0700171extern unsigned long snmp_fold_field(void *mib[], int offt);
YOSHIFUJI Hideakic69bce22008-01-23 22:31:45 -0800172extern int snmp_mib_init(void *ptr[2], size_t mibsize);
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700173extern void snmp_mib_free(void *ptr[2]);
174
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700175extern void inet_get_local_port_range(int *low, int *high);
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177extern int sysctl_ip_default_ttl;
Neil Hormancdac4e02005-06-13 15:12:33 -0700178extern int sysctl_ip_nonlocal_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Pavel Emelyanov3d7cc2b2008-01-09 00:33:11 -0800180extern struct ctl_path net_ipv4_ctl_path[];
181
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300182/* From inetpeer.c */
183extern int inet_peer_threshold;
184extern int inet_peer_minttl;
185extern int inet_peer_maxttl;
186extern int inet_peer_gc_mintime;
187extern int inet_peer_gc_maxtime;
188
189/* From ip_output.c */
190extern int sysctl_ip_dynaddr;
191
192extern void ipfrag_init(void);
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200195#include <net/dst.h>
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197/* The function in 2.2 was invalid, producing wrong result for
198 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
199static inline
200int ip_decrease_ttl(struct iphdr *iph)
201{
Al Viro5c78f272006-11-14 21:42:26 -0800202 u32 check = (__force u32)iph->check;
203 check += (__force u32)htons(0x0100);
204 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 return --iph->ttl;
206}
207
208static inline
209int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
210{
211 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
212 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
213 !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU))));
214}
215
216extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
217
218static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
219{
220 if (iph->frag_off & htons(IP_DF)) {
221 /* This is only to work around buggy Windows95/2000
222 * VJ compression implementations. If the ID field
223 * does not change, they drop every other packet in
224 * a TCP stream using header compression.
225 */
226 iph->id = (sk && inet_sk(sk)->daddr) ?
227 htons(inet_sk(sk)->id++) : 0;
228 } else
229 __ip_select_ident(iph, dst, 0);
230}
231
232static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
233{
234 if (iph->frag_off & htons(IP_DF)) {
235 if (sk && inet_sk(sk)->daddr) {
236 iph->id = htons(inet_sk(sk)->id);
237 inet_sk(sk)->id += 1 + more;
238 } else
239 iph->id = 0;
240 } else
241 __ip_select_ident(iph, dst, more);
242}
243
244/*
245 * Map a multicast IP onto multicast MAC for type ethernet.
246 */
247
Al Viro714e85b2006-11-14 20:51:49 -0800248static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Al Viro714e85b2006-11-14 20:51:49 -0800250 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 buf[0]=0x01;
252 buf[1]=0x00;
253 buf[2]=0x5e;
254 buf[5]=addr&0xFF;
255 addr>>=8;
256 buf[4]=addr&0xFF;
257 addr>>=8;
258 buf[3]=addr&0x7F;
259}
260
261/*
262 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
263 * Leave P_Key as 0 to be filled in by driver.
264 */
265
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700266static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
Al Viro714e85b2006-11-14 20:51:49 -0800268 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700269 unsigned char scope = broadcast[5] & 0xF;
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 buf[0] = 0; /* Reserved */
272 buf[1] = 0xff; /* Multicast QPN */
273 buf[2] = 0xff;
274 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800275 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700277 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 buf[6] = 0x40; /* IPv4 signature */
279 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700280 buf[8] = broadcast[8]; /* P_Key */
281 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 buf[10] = 0;
283 buf[11] = 0;
284 buf[12] = 0;
285 buf[13] = 0;
286 buf[14] = 0;
287 buf[15] = 0;
288 buf[19] = addr & 0xff;
289 addr >>= 8;
290 buf[18] = addr & 0xff;
291 addr >>= 8;
292 buf[17] = addr & 0xff;
293 addr >>= 8;
294 buf[16] = addr & 0x0f;
295}
296
297#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
298#include <linux/ipv6.h>
299#endif
300
301static __inline__ void inet_reset_saddr(struct sock *sk)
302{
303 inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
304#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
305 if (sk->sk_family == PF_INET6) {
306 struct ipv6_pinfo *np = inet6_sk(sk);
307
308 memset(&np->saddr, 0, sizeof(np->saddr));
309 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
310 }
311#endif
312}
313
314#endif
315
316extern int ip_call_ra_chain(struct sk_buff *skb);
317
318/*
Rami Rosenb7982322008-01-01 21:13:09 -0800319 * Functions provided by ip_fragment.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 */
321
322enum ip_defrag_users
323{
324 IP_DEFRAG_LOCAL_DELIVER,
325 IP_DEFRAG_CALL_RA_CHAIN,
326 IP_DEFRAG_CONNTRACK_IN,
327 IP_DEFRAG_CONNTRACK_OUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 IP_DEFRAG_VS_IN,
329 IP_DEFRAG_VS_OUT,
330 IP_DEFRAG_VS_FWD
331};
332
Herbert Xu776c7292007-10-14 00:38:32 -0700333int ip_defrag(struct sk_buff *skb, u32 user);
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800334int ip_frag_mem(struct net *net);
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800335int ip_frag_nqueues(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337/*
338 * Functions provided by ip_forward.c
339 */
340
341extern int ip_forward(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343/*
344 * Functions provided by ip_options.c
345 */
346
Al Viro8712f772006-09-26 22:27:05 -0700347extern 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 -0700348extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
349extern void ip_options_fragment(struct sk_buff *skb);
Denis V. Lunev0e6bd4a2008-03-24 15:29:23 -0700350extern int ip_options_compile(struct net *net,
351 struct ip_options *opt, struct sk_buff *skb);
Denis V. Lunevf2c48022008-03-24 15:29:55 -0700352extern int ip_options_get(struct net *net, struct ip_options **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300353 unsigned char *data, int optlen);
Denis V. Lunevf2c48022008-03-24 15:29:55 -0700354extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300355 unsigned char __user *data, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356extern void ip_options_undo(struct ip_options * opt);
357extern void ip_forward_options(struct sk_buff *skb);
358extern int ip_options_rcv_srr(struct sk_buff *skb);
359
360/*
361 * Functions provided by ip_sockglue.c
362 */
363
364extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
Denis V. Lunev7a6adb92008-03-24 15:30:27 -0700365extern int ip_cmsg_send(struct net *net,
366 struct msghdr *msg, struct ipcm_cookie *ipc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
368extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800369extern int compat_ip_setsockopt(struct sock *sk, int level,
370 int optname, char __user *optval, int optlen);
371extern int compat_ip_getsockopt(struct sock *sk, int level,
372 int optname, char __user *optval, int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
374
375extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
376extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700377 __be16 port, u32 info, u8 *payload);
Al Viro05790162006-09-27 18:33:40 -0700378extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 u32 info);
380
381/* sysctl helpers - any sysctl which holds a value that ends up being
382 * fed into the routing cache should use these handlers.
383 */
384int ipv4_doint_and_flush(ctl_table *ctl, int write,
385 struct file* filp, void __user *buffer,
386 size_t *lenp, loff_t *ppos);
387int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
388 void __user *oldval, size_t __user *oldlenp,
Alexey Dobriyan1f29bcd2006-12-10 02:19:10 -0800389 void __user *newval, size_t newlen);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300390#ifdef CONFIG_PROC_FS
391extern int ip_misc_proc_init(void);
392#endif
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394#endif /* _IP_H */