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[net-next-2.6.git] / include / net / ip.h
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1da177e4
LT		 1/*
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 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * 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
1da177e4 25#include <linux/types.h>
1da177e4
LT		 26#include <linux/ip.h>
27#include <linux/in.h>
c9bdd4b5 28#include <linux/skbuff.h>
14c85021
ACM		 29
30#include <net/inet_sock.h>
1da177e4
LT		 31#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
8cdfab8a
PM		 40#define IPSKB_FORWARDED 1
41#define IPSKB_XFRM_TUNNEL_SIZE 2
3e3850e9
PM		 42#define IPSKB_XFRM_TRANSFORMED 4
43#define IPSKB_FRAG_COMPLETE 8
48d5cad8 44#define IPSKB_REROUTED 16
1da177e4
LT		 45};
46
c9bdd4b5
ACM		 47static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
48{
eddc9ec5 49 return ip_hdr(skb)->ihl * 4;
c9bdd4b5
ACM		 50}
51
1da177e4
LT		 52struct ipcm_cookie
53{
c1d18f9f 54 __be32 addr;
1da177e4
LT		 55 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
14c85021
ACM		 79struct msghdr;
80struct net_device;
81struct packet_type;
82struct rtable;
14c85021
ACM		 83struct sockaddr;
84
1da177e4
LT		 85extern 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,
13d8eaa0 94 __be32 saddr, __be32 daddr,
1da177e4
LT		 95 struct ip_options *opt);
96extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
f2ccd8fa 97 struct packet_type *pt, struct net_device *orig_dev);
1da177e4
LT		 98extern 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);
2e2f7aef 102extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
1da177e4
LT		 103extern int ip_do_nat(struct sk_buff *skb);
104extern void ip_send_check(struct iphdr *ip);
e89862f4 105extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
1da177e4
LT		 106extern 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
714e85be 131static inline void ip_tr_mc_map(__be32 addr, char *buf)
1da177e4
LT		 132{
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];
d6f5493c 143 __wsum csum;
1da177e4
LT		 144 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
145 /* -1 if not needed */
146};
147
148void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
149 unsigned int len);
150
1da177e4
LT		 151struct ipv4_config
152{
153 int log_martians;
1da177e4
LT		 154 int no_pmtu_disc;
155};
156
157extern struct ipv4_config ipv4_config;
158DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics);
159#define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field)
160#define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field)
161#define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field)
162DECLARE_SNMP_STAT(struct linux_mib, net_statistics);
163#define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field)
164#define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field)
165#define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field)
166#define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd)
167#define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd)
168
5e0f0435 169extern unsigned long snmp_fold_field(void *mib[], int offt);
33490170
YH		 170extern int snmp_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
171extern void snmp_mib_free(void *ptr[2]);
172
1da177e4
LT		 173extern int sysctl_local_port_range[2];
174extern int sysctl_ip_default_ttl;
cdac4e07 175extern int sysctl_ip_nonlocal_bind;
1da177e4 176
20380731
ACM		 177/* From ip_fragment.c */
178extern int sysctl_ipfrag_high_thresh;
179extern int sysctl_ipfrag_low_thresh;
180extern int sysctl_ipfrag_time;
181extern int sysctl_ipfrag_secret_interval;
89cee8b1 182extern int sysctl_ipfrag_max_dist;
20380731
ACM		 183
184/* From inetpeer.c */
185extern int inet_peer_threshold;
186extern int inet_peer_minttl;
187extern int inet_peer_maxttl;
188extern int inet_peer_gc_mintime;
189extern int inet_peer_gc_maxtime;
190
191/* From ip_output.c */
192extern int sysctl_ip_dynaddr;
193
194extern void ipfrag_init(void);
195
1da177e4 196#ifdef CONFIG_INET
14c85021
ACM		 197#include <net/dst.h>
198
1da177e4
LT		 199/* The function in 2.2 was invalid, producing wrong result for
200 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
201static inline
202int ip_decrease_ttl(struct iphdr *iph)
203{
5c78f275
AV		 204 u32 check = (__force u32)iph->check;
205 check += (__force u32)htons(0x0100);
206 iph->check = (__force __sum16)(check + (check>=0xFFFF));
1da177e4
LT		 207 return --iph->ttl;
208}
209
210static inline
211int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
212{
213 return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
214 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
215 !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU))));
216}
217
218extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
219
220static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
221{
222 if (iph->frag_off & htons(IP_DF)) {
223 /* This is only to work around buggy Windows95/2000
224 * VJ compression implementations. If the ID field
225 * does not change, they drop every other packet in
226 * a TCP stream using header compression.
227 */
228 iph->id = (sk && inet_sk(sk)->daddr) ?
229 htons(inet_sk(sk)->id++) : 0;
230 } else
231 __ip_select_ident(iph, dst, 0);
232}
233
234static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
235{
236 if (iph->frag_off & htons(IP_DF)) {
237 if (sk && inet_sk(sk)->daddr) {
238 iph->id = htons(inet_sk(sk)->id);
239 inet_sk(sk)->id += 1 + more;
240 } else
241 iph->id = 0;
242 } else
243 __ip_select_ident(iph, dst, more);
244}
245
246/*
247 * Map a multicast IP onto multicast MAC for type ethernet.
248 */
249
714e85be 250static inline void ip_eth_mc_map(__be32 naddr, char *buf)
1da177e4 251{
714e85be 252 __u32 addr=ntohl(naddr);
1da177e4
LT		 253 buf[0]=0x01;
254 buf[1]=0x00;
255 buf[2]=0x5e;
256 buf[5]=addr&0xFF;
257 addr>>=8;
258 buf[4]=addr&0xFF;
259 addr>>=8;
260 buf[3]=addr&0x7F;
261}
262
263/*
264 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
265 * Leave P_Key as 0 to be filled in by driver.
266 */
267
714e85be 268static inline void ip_ib_mc_map(__be32 naddr, char *buf)
1da177e4 269{
714e85be 270 __u32 addr;
1da177e4
LT		 271 buf[0] = 0; /* Reserved */
272 buf[1] = 0xff; /* Multicast QPN */
273 buf[2] = 0xff;
274 buf[3] = 0xff;
714e85be 275 addr = ntohl(naddr);
1da177e4
LT		 276 buf[4] = 0xff;
277 buf[5] = 0x12; /* link local scope */
278 buf[6] = 0x40; /* IPv4 signature */
279 buf[7] = 0x1b;
280 buf[8] = 0; /* P_Key */
281 buf[9] = 0;
282 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/*
319 * Functions provided by ip_fragment.o
320 */
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,
1da177e4
LT		 328 IP_DEFRAG_VS_IN,
329 IP_DEFRAG_VS_OUT,
330 IP_DEFRAG_VS_FWD
331};
332
333struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user);
334extern int ip_frag_nqueues;
335extern atomic_t ip_frag_mem;
336
337/*
338 * Functions provided by ip_forward.c
339 */
340
341extern int ip_forward(struct sk_buff *skb);
342extern int ip_net_unreachable(struct sk_buff *skb);
343
344/*
345 * Functions provided by ip_options.c
346 */
347
8712f774 348extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
1da177e4
LT		 349extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
350extern void ip_options_fragment(struct sk_buff *skb);
351extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb);
4c6ea29d
ACM		 352extern int ip_options_get(struct ip_options **optp,
353 unsigned char *data, int optlen);
354extern int ip_options_get_from_user(struct ip_options **optp,
355 unsigned char __user *data, int optlen);
1da177e4
LT		 356extern 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);
365extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc);
366extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
367extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
3fdadf7d
DM		 368extern int compat_ip_setsockopt(struct sock *sk, int level,
369 int optname, char __user *optval, int optlen);
370extern int compat_ip_getsockopt(struct sock *sk, int level,
371 int optname, char __user *optval, int __user *optlen);
1da177e4
LT		 372extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
373
374extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
375extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 376 __be16 port, u32 info, u8 *payload);
0579016e 377extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
1da177e4
LT		 378 u32 info);
379
380/* sysctl helpers - any sysctl which holds a value that ends up being
381 * fed into the routing cache should use these handlers.
382 */
383int ipv4_doint_and_flush(ctl_table *ctl, int write,
384 struct file* filp, void __user *buffer,
385 size_t *lenp, loff_t *ppos);
386int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
387 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 388 void __user *newval, size_t newlen);
20380731
ACM		 389#ifdef CONFIG_PROC_FS
390extern int ip_misc_proc_init(void);
391#endif
392
393extern struct ctl_table ipv4_table[];
1da177e4
LT		 394
395#endif /* _IP_H */
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