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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 void ip_mc_dropsocket(struct sock *);
86extern void ip_mc_dropdevice(struct net_device *dev);
87extern 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);
David S. Millere89862f2007-01-26 01:04:55 -0800107extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
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,
114 struct rtable *rt,
115 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];
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
151void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
152 unsigned int len);
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154struct ipv4_config
155{
156 int log_martians;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 int no_pmtu_disc;
158};
159
160extern struct ipv4_config ipv4_config;
161DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics);
162#define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field)
163#define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field)
164#define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field)
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700165#define IP_ADD_STATS_BH(field, val) SNMP_ADD_STATS_BH(ip_statistics, field, val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166DECLARE_SNMP_STAT(struct linux_mib, net_statistics);
167#define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field)
168#define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field)
169#define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field)
170#define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd)
171#define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd)
172
Herbert Xu5e0f0432007-04-24 21:53:35 -0700173extern unsigned long snmp_fold_field(void *mib[], int offt);
YOSHIFUJI Hideakic69bce22008-01-23 22:31:45 -0800174extern int snmp_mib_init(void *ptr[2], size_t mibsize);
YOSHIFUJI Hideaki33490172007-04-20 15:57:15 -0700175extern void snmp_mib_free(void *ptr[2]);
176
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700177extern void inet_get_local_port_range(int *low, int *high);
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179extern int sysctl_ip_default_ttl;
Neil Hormancdac4e02005-06-13 15:12:33 -0700180extern int sysctl_ip_nonlocal_bind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300182/* From ip_fragment.c */
Pavel Emelyanov04128f22007-10-15 02:33:45 -0700183struct inet_frags_ctl;
184extern struct inet_frags_ctl ip4_frags_ctl;
Herbert Xu89cee8b2005-12-13 23:14:27 -0800185extern int sysctl_ipfrag_max_dist;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300186
187/* From inetpeer.c */
188extern int inet_peer_threshold;
189extern int inet_peer_minttl;
190extern int inet_peer_maxttl;
191extern int inet_peer_gc_mintime;
192extern int inet_peer_gc_maxtime;
193
194/* From ip_output.c */
195extern int sysctl_ip_dynaddr;
196
197extern void ipfrag_init(void);
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#ifdef CONFIG_INET
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200200#include <net/dst.h>
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202/* The function in 2.2 was invalid, producing wrong result for
203 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
204static inline
205int ip_decrease_ttl(struct iphdr *iph)
206{
Al Viro5c78f272006-11-14 21:42:26 -0800207 u32 check = (__force u32)iph->check;
208 check += (__force u32)htons(0x0100);
209 iph->check = (__force __sum16)(check + (check>=0xFFFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return --iph->ttl;
211}
212
213static inline
214int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
215{
216 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
217 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
218 !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU))));
219}
220
221extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
222
223static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
224{
225 if (iph->frag_off & htons(IP_DF)) {
226 /* This is only to work around buggy Windows95/2000
227 * VJ compression implementations. If the ID field
228 * does not change, they drop every other packet in
229 * a TCP stream using header compression.
230 */
231 iph->id = (sk && inet_sk(sk)->daddr) ?
232 htons(inet_sk(sk)->id++) : 0;
233 } else
234 __ip_select_ident(iph, dst, 0);
235}
236
237static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
238{
239 if (iph->frag_off & htons(IP_DF)) {
240 if (sk && inet_sk(sk)->daddr) {
241 iph->id = htons(inet_sk(sk)->id);
242 inet_sk(sk)->id += 1 + more;
243 } else
244 iph->id = 0;
245 } else
246 __ip_select_ident(iph, dst, more);
247}
248
249/*
250 * Map a multicast IP onto multicast MAC for type ethernet.
251 */
252
Al Viro714e85b2006-11-14 20:51:49 -0800253static inline void ip_eth_mc_map(__be32 naddr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
Al Viro714e85b2006-11-14 20:51:49 -0800255 __u32 addr=ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 buf[0]=0x01;
257 buf[1]=0x00;
258 buf[2]=0x5e;
259 buf[5]=addr&0xFF;
260 addr>>=8;
261 buf[4]=addr&0xFF;
262 addr>>=8;
263 buf[3]=addr&0x7F;
264}
265
266/*
267 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
268 * Leave P_Key as 0 to be filled in by driver.
269 */
270
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700271static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
Al Viro714e85b2006-11-14 20:51:49 -0800273 __u32 addr;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700274 unsigned char scope = broadcast[5] & 0xF;
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 buf[0] = 0; /* Reserved */
277 buf[1] = 0xff; /* Multicast QPN */
278 buf[2] = 0xff;
279 buf[3] = 0xff;
Al Viro714e85b2006-11-14 20:51:49 -0800280 addr = ntohl(naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 buf[4] = 0xff;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700282 buf[5] = 0x10 | scope; /* scope from broadcast address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 buf[6] = 0x40; /* IPv4 signature */
284 buf[7] = 0x1b;
Rolf Manderscheida9e527e2007-12-10 13:38:41 -0700285 buf[8] = broadcast[8]; /* P_Key */
286 buf[9] = broadcast[9];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 buf[10] = 0;
288 buf[11] = 0;
289 buf[12] = 0;
290 buf[13] = 0;
291 buf[14] = 0;
292 buf[15] = 0;
293 buf[19] = addr & 0xff;
294 addr >>= 8;
295 buf[18] = addr & 0xff;
296 addr >>= 8;
297 buf[17] = addr & 0xff;
298 addr >>= 8;
299 buf[16] = addr & 0x0f;
300}
301
302#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
303#include <linux/ipv6.h>
304#endif
305
306static __inline__ void inet_reset_saddr(struct sock *sk)
307{
308 inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
309#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
310 if (sk->sk_family == PF_INET6) {
311 struct ipv6_pinfo *np = inet6_sk(sk);
312
313 memset(&np->saddr, 0, sizeof(np->saddr));
314 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
315 }
316#endif
317}
318
319#endif
320
321extern int ip_call_ra_chain(struct sk_buff *skb);
322
323/*
324 * Functions provided by ip_fragment.o
325 */
326
327enum ip_defrag_users
328{
329 IP_DEFRAG_LOCAL_DELIVER,
330 IP_DEFRAG_CALL_RA_CHAIN,
331 IP_DEFRAG_CONNTRACK_IN,
332 IP_DEFRAG_CONNTRACK_OUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 IP_DEFRAG_VS_IN,
334 IP_DEFRAG_VS_OUT,
335 IP_DEFRAG_VS_FWD
336};
337
Herbert Xu776c7292007-10-14 00:38:32 -0700338int ip_defrag(struct sk_buff *skb, u32 user);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700339int ip_frag_mem(void);
340int ip_frag_nqueues(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342/*
343 * Functions provided by ip_forward.c
344 */
345
346extern int ip_forward(struct sk_buff *skb);
347extern int ip_net_unreachable(struct sk_buff *skb);
348
349/*
350 * Functions provided by ip_options.c
351 */
352
Al Viro8712f772006-09-26 22:27:05 -0700353extern 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 -0700354extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
355extern void ip_options_fragment(struct sk_buff *skb);
356extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb);
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300357extern int ip_options_get(struct ip_options **optp,
358 unsigned char *data, int optlen);
359extern int ip_options_get_from_user(struct ip_options **optp,
360 unsigned char __user *data, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361extern void ip_options_undo(struct ip_options * opt);
362extern void ip_forward_options(struct sk_buff *skb);
363extern int ip_options_rcv_srr(struct sk_buff *skb);
364
365/*
366 * Functions provided by ip_sockglue.c
367 */
368
369extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
370extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc);
371extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
372extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800373extern int compat_ip_setsockopt(struct sock *sk, int level,
374 int optname, char __user *optval, int optlen);
375extern int compat_ip_getsockopt(struct sock *sk, int level,
376 int optname, char __user *optval, int __user *optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
378
379extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
380extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700381 __be16 port, u32 info, u8 *payload);
Al Viro05790162006-09-27 18:33:40 -0700382extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 u32 info);
384
385/* sysctl helpers - any sysctl which holds a value that ends up being
386 * fed into the routing cache should use these handlers.
387 */
388int ipv4_doint_and_flush(ctl_table *ctl, int write,
389 struct file* filp, void __user *buffer,
390 size_t *lenp, loff_t *ppos);
391int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
392 void __user *oldval, size_t __user *oldlenp,
Alexey Dobriyan1f29bcd2006-12-10 02:19:10 -0800393 void __user *newval, size_t newlen);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300394#ifdef CONFIG_PROC_FS
395extern int ip_misc_proc_init(void);
396#endif
397
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398#endif /* _IP_H */