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CommitLineData
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>
aa661581 31#include <net/route.h>
1da177e4 32#include <net/snmp.h>
86b08d86 33#include <net/flow.h>
1da177e4
LT
34
35struct sock;
36
fd2c3ef7 37struct inet_skb_parm {
1da177e4
LT
38 struct ip_options opt; /* Compiled IP options */
39 unsigned char flags;
40
8cdfab8a
PM
41#define IPSKB_FORWARDED 1
42#define IPSKB_XFRM_TUNNEL_SIZE 2
3e3850e9
PM
43#define IPSKB_XFRM_TRANSFORMED 4
44#define IPSKB_FRAG_COMPLETE 8
48d5cad8 45#define IPSKB_REROUTED 16
5f2d04f1
PM
46
47 u16 frag_max_size;
1da177e4
LT
48};
49
c9bdd4b5
ACM
50static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
51{
eddc9ec5 52 return ip_hdr(skb)->ihl * 4;
c9bdd4b5
ACM
53}
54
fd2c3ef7 55struct ipcm_cookie {
c1d18f9f 56 __be32 addr;
1da177e4 57 int oif;
f6d8bd05 58 struct ip_options_rcu *opt;
2244d07b 59 __u8 tx_flags;
f02db315
FF
60 __u8 ttl;
61 __s16 tos;
62 char priority;
1da177e4
LT
63};
64
65#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
4b261c75 66#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
1da177e4 67
fd2c3ef7 68struct ip_ra_chain {
43a951e9 69 struct ip_ra_chain __rcu *next;
1da177e4 70 struct sock *sk;
592fcb9d
ED
71 union {
72 void (*destructor)(struct sock *);
73 struct sock *saved_sk;
74 };
66018506 75 struct rcu_head rcu;
1da177e4
LT
76};
77
43a951e9 78extern struct ip_ra_chain __rcu *ip_ra_chain;
1da177e4
LT
79
80/* IP flags. */
81#define IP_CE 0x8000 /* Flag: "Congestion" */
82#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
83#define IP_MF 0x2000 /* Flag: "More Fragments" */
84#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
85
86#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
87
14c85021
ACM
88struct msghdr;
89struct net_device;
90struct packet_type;
91struct rtable;
14c85021
ACM
92struct sockaddr;
93
72c1d3bd 94int igmp_mc_init(void);
1da177e4
LT
95
96/*
97 * Functions provided by ip.c
98 */
99
5c3a0fd7
JP
100int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
101 __be32 saddr, __be32 daddr,
102 struct ip_options_rcu *opt);
103int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
104 struct net_device *orig_dev);
105int ip_local_deliver(struct sk_buff *skb);
106int ip_mr_input(struct sk_buff *skb);
aad88724
ED
107int ip_output(struct sock *sk, struct sk_buff *skb);
108int ip_mc_output(struct sock *sk, struct sk_buff *skb);
5c3a0fd7
JP
109int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
110int ip_do_nat(struct sk_buff *skb);
111void ip_send_check(struct iphdr *ip);
112int __ip_local_out(struct sk_buff *skb);
aad88724
ED
113int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
114static inline int ip_local_out(struct sk_buff *skb)
115{
116 return ip_local_out_sk(skb->sk, skb);
117}
118
b0270e91 119int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
5c3a0fd7
JP
120void ip_init(void);
121int ip_append_data(struct sock *sk, struct flowi4 *fl4,
122 int getfrag(void *from, char *to, int offset, int len,
123 int odd, struct sk_buff *skb),
124 void *from, int len, int protolen,
125 struct ipcm_cookie *ipc,
126 struct rtable **rt,
127 unsigned int flags);
128int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
129 struct sk_buff *skb);
130ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
131 int offset, size_t size, int flags);
132struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
133 struct sk_buff_head *queue,
134 struct inet_cork *cork);
135int ip_send_skb(struct net *net, struct sk_buff *skb);
136int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
137void ip_flush_pending_frames(struct sock *sk);
138struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
139 int getfrag(void *from, char *to, int offset,
140 int len, int odd, struct sk_buff *skb),
141 void *from, int length, int transhdrlen,
142 struct ipcm_cookie *ipc, struct rtable **rtp,
143 unsigned int flags);
1c32c5ad 144
77968b78 145static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
1c32c5ad 146{
77968b78 147 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
1c32c5ad 148}
1da177e4 149
aa661581
FF
150static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
151{
152 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
153}
154
155static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
156{
157 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
158}
159
1da177e4 160/* datagram.c */
5c3a0fd7 161int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
1da177e4 162
5c3a0fd7 163void ip4_datagram_release_cb(struct sock *sk);
8141ed9f 164
1da177e4
LT
165struct ip_reply_arg {
166 struct kvec iov[1];
88ef4a5a 167 int flags;
d6f5493c 168 __wsum csum;
1da177e4
LT
169 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
170 /* -1 if not needed */
f0e48dbf 171 int bound_dev_if;
66b13d99 172 u8 tos;
1da177e4
LT
173};
174
88ef4a5a
KK
175#define IP_REPLY_ARG_NOSRCCHECK 1
176
86b08d86
KK
177static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
178{
179 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
180}
181
be9f4a44 182void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
70e73416
DM
183 __be32 saddr, const struct ip_reply_arg *arg,
184 unsigned int len);
1da177e4 185
4ce3c183
ED
186#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
187#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
188#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
189#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
190#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
191#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
61a7e260
PE
192#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
193#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
194#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
f7324acd 195#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
61a7e260
PE
196#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
197#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
1da177e4 198
698365fa 199unsigned long snmp_fold_field(void __percpu *mib, int offt);
4ce3c183 200#if BITS_PER_LONG==32
698365fa 201u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
4ce3c183 202#else
698365fa 203static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
4ce3c183
ED
204{
205 return snmp_fold_field(mib, offt);
206}
207#endif
33490170 208
0bbf87d8 209void inet_get_local_port_range(struct net *net, int *low, int *high);
227b60f5 210
e3826f1e
AW
211extern unsigned long *sysctl_local_reserved_ports;
212static inline int inet_is_reserved_local_port(int port)
213{
214 return test_bit(port, sysctl_local_reserved_ports);
215}
216
cdac4e07 217extern int sysctl_ip_nonlocal_bind;
1da177e4 218
20380731
ACM
219/* From inetpeer.c */
220extern int inet_peer_threshold;
221extern int inet_peer_minttl;
222extern int inet_peer_maxttl;
20380731 223
6648bd7e
AD
224/* From ip_input.c */
225extern int sysctl_ip_early_demux;
226
20380731
ACM
227/* From ip_output.c */
228extern int sysctl_ip_dynaddr;
229
5c3a0fd7 230void ipfrag_init(void);
20380731 231
5c3a0fd7 232void ip_static_sysctl_init(void);
bd7b1533 233
e110861f
LC
234#define IP4_REPLY_MARK(net, mark) \
235 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
236
d18cd551
DM
237static inline bool ip_is_fragment(const struct iphdr *iph)
238{
239 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
240}
241
1da177e4 242#ifdef CONFIG_INET
14c85021
ACM
243#include <net/dst.h>
244
1da177e4
LT
245/* The function in 2.2 was invalid, producing wrong result for
246 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
247static inline
248int ip_decrease_ttl(struct iphdr *iph)
249{
5c78f275
AV
250 u32 check = (__force u32)iph->check;
251 check += (__force u32)htons(0x0100);
252 iph->check = (__force __sum16)(check + (check>=0xFFFF));
1da177e4
LT
253 return --iph->ttl;
254}
255
256static inline
257int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
258{
a02cec21 259 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
1da177e4 260 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
a02cec21 261 !(dst_metric_locked(dst, RTAX_MTU)));
1da177e4
LT
262}
263
f87c10a8
HFS
264static inline bool ip_sk_accept_pmtu(const struct sock *sk)
265{
1b346576
HFS
266 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
267 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
f87c10a8
HFS
268}
269
270static inline bool ip_sk_use_pmtu(const struct sock *sk)
271{
272 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
273}
274
60ff7467 275static inline bool ip_sk_ignore_df(const struct sock *sk)
1b346576
HFS
276{
277 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
278 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
279}
280
f87c10a8
HFS
281static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
282 bool forwarding)
283{
284 struct net *net = dev_net(dst->dev);
285
286 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
287 dst_metric_locked(dst, RTAX_MTU) ||
288 !forwarding)
289 return dst_mtu(dst);
290
291 return min(dst->dev->mtu, IP_MAX_MTU);
292}
293
294static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
295{
296 if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
297 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
298 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
299 } else {
300 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
301 }
302}
303
5c3a0fd7 304void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
1da177e4 305
703133de 306static inline void ip_select_ident(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk)
1da177e4 307{
703133de
AA
308 struct iphdr *iph = ip_hdr(skb);
309
60ff7467 310 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
1da177e4
LT
311 /* This is only to work around buggy Windows95/2000
312 * VJ compression implementations. If the ID field
313 * does not change, they drop every other packet in
314 * a TCP stream using header compression.
315 */
c720c7e8
ED
316 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
317 htons(inet_sk(sk)->inet_id++) : 0;
1da177e4
LT
318 } else
319 __ip_select_ident(iph, dst, 0);
320}
321
703133de 322static inline void ip_select_ident_more(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk, int more)
1da177e4 323{
703133de
AA
324 struct iphdr *iph = ip_hdr(skb);
325
60ff7467 326 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
c720c7e8
ED
327 if (sk && inet_sk(sk)->inet_daddr) {
328 iph->id = htons(inet_sk(sk)->inet_id);
329 inet_sk(sk)->inet_id += 1 + more;
1da177e4
LT
330 } else
331 iph->id = 0;
332 } else
333 __ip_select_ident(iph, dst, more);
334}
335
ed70fcfc
TH
336static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
337{
338 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
339 skb->len, proto, 0);
340}
341
1da177e4
LT
342/*
343 * Map a multicast IP onto multicast MAC for type ethernet.
344 */
345
714e85be 346static inline void ip_eth_mc_map(__be32 naddr, char *buf)
1da177e4 347{
714e85be 348 __u32 addr=ntohl(naddr);
1da177e4
LT
349 buf[0]=0x01;
350 buf[1]=0x00;
351 buf[2]=0x5e;
352 buf[5]=addr&0xFF;
353 addr>>=8;
354 buf[4]=addr&0xFF;
355 addr>>=8;
356 buf[3]=addr&0x7F;
357}
358
359/*
360 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
361 * Leave P_Key as 0 to be filled in by driver.
362 */
363
a9e527e3 364static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
1da177e4 365{
714e85be 366 __u32 addr;
a9e527e3
RM
367 unsigned char scope = broadcast[5] & 0xF;
368
1da177e4
LT
369 buf[0] = 0; /* Reserved */
370 buf[1] = 0xff; /* Multicast QPN */
371 buf[2] = 0xff;
372 buf[3] = 0xff;
714e85be 373 addr = ntohl(naddr);
1da177e4 374 buf[4] = 0xff;
a9e527e3 375 buf[5] = 0x10 | scope; /* scope from broadcast address */
1da177e4
LT
376 buf[6] = 0x40; /* IPv4 signature */
377 buf[7] = 0x1b;
a9e527e3
RM
378 buf[8] = broadcast[8]; /* P_Key */
379 buf[9] = broadcast[9];
1da177e4
LT
380 buf[10] = 0;
381 buf[11] = 0;
382 buf[12] = 0;
383 buf[13] = 0;
384 buf[14] = 0;
385 buf[15] = 0;
386 buf[19] = addr & 0xff;
387 addr >>= 8;
388 buf[18] = addr & 0xff;
389 addr >>= 8;
390 buf[17] = addr & 0xff;
391 addr >>= 8;
392 buf[16] = addr & 0x0f;
393}
394
93ca3bb5
TT
395static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
396{
397 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
398 memcpy(buf, broadcast, 4);
399 else
400 memcpy(buf, &naddr, sizeof(naddr));
401}
402
dfd56b8b 403#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT
404#include <linux/ipv6.h>
405#endif
406
407static __inline__ void inet_reset_saddr(struct sock *sk)
408{
c720c7e8 409 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
dfd56b8b 410#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT
411 if (sk->sk_family == PF_INET6) {
412 struct ipv6_pinfo *np = inet6_sk(sk);
413
414 memset(&np->saddr, 0, sizeof(np->saddr));
efe4208f 415 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
1da177e4
LT
416 }
417#endif
418}
419
420#endif
421
7ad6848c
OP
422static inline int sk_mc_loop(struct sock *sk)
423{
424 if (!sk)
425 return 1;
426 switch (sk->sk_family) {
427 case AF_INET:
428 return inet_sk(sk)->mc_loop;
dfd56b8b 429#if IS_ENABLED(CONFIG_IPV6)
7ad6848c
OP
430 case AF_INET6:
431 return inet6_sk(sk)->mc_loop;
432#endif
433 }
cd65c3c7 434 WARN_ON(1);
7ad6848c
OP
435 return 1;
436}
437
5c3a0fd7 438bool ip_call_ra_chain(struct sk_buff *skb);
1da177e4
LT
439
440/*
b798232f 441 * Functions provided by ip_fragment.c
1da177e4
LT
442 */
443
fd2c3ef7 444enum ip_defrag_users {
1da177e4
LT
445 IP_DEFRAG_LOCAL_DELIVER,
446 IP_DEFRAG_CALL_RA_CHAIN,
447 IP_DEFRAG_CONNTRACK_IN,
4be929be 448 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
1da177e4 449 IP_DEFRAG_CONNTRACK_OUT,
4be929be 450 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
8fa9ff68 451 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
4be929be 452 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
1da177e4
LT
453 IP_DEFRAG_VS_IN,
454 IP_DEFRAG_VS_OUT,
595fc71b
DM
455 IP_DEFRAG_VS_FWD,
456 IP_DEFRAG_AF_PACKET,
bc416d97 457 IP_DEFRAG_MACVLAN,
1da177e4
LT
458};
459
776c729e 460int ip_defrag(struct sk_buff *skb, u32 user);
bc416d97
ED
461#ifdef CONFIG_INET
462struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
463#else
464static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
465{
466 return skb;
467}
468#endif
6ddc0822 469int ip_frag_mem(struct net *net);
e5a2bb84 470int ip_frag_nqueues(struct net *net);
1da177e4
LT
471
472/*
473 * Functions provided by ip_forward.c
474 */
475
5c3a0fd7 476int ip_forward(struct sk_buff *skb);
1da177e4
LT
477
478/*
479 * Functions provided by ip_options.c
480 */
481
5c3a0fd7
JP
482void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
483 __be32 daddr, struct rtable *rt, int is_frag);
484int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
485void ip_options_fragment(struct sk_buff *skb);
486int ip_options_compile(struct net *net, struct ip_options *opt,
487 struct sk_buff *skb);
488int ip_options_get(struct net *net, struct ip_options_rcu **optp,
489 unsigned char *data, int optlen);
490int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
491 unsigned char __user *data, int optlen);
492void ip_options_undo(struct ip_options *opt);
493void ip_forward_options(struct sk_buff *skb);
494int ip_options_rcv_srr(struct sk_buff *skb);
1da177e4
LT
495
496/*
497 * Functions provided by ip_sockglue.c
498 */
499
fbf8866d 500void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
5c3a0fd7 501void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
c8e6ad08
HFS
502int ip_cmsg_send(struct net *net, struct msghdr *msg,
503 struct ipcm_cookie *ipc, bool allow_ipv6);
5c3a0fd7
JP
504int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
505 unsigned int optlen);
506int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
507 int __user *optlen);
508int compat_ip_setsockopt(struct sock *sk, int level, int optname,
509 char __user *optval, unsigned int optlen);
510int compat_ip_getsockopt(struct sock *sk, int level, int optname,
511 char __user *optval, int __user *optlen);
512int ip_ra_control(struct sock *sk, unsigned char on,
513 void (*destructor)(struct sock *));
514
85fbaa75 515int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
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516void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
517 u32 info, u8 *payload);
518void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
519 u32 info);
1da177e4 520
20380731 521#ifdef CONFIG_PROC_FS
5c3a0fd7 522int ip_misc_proc_init(void);
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ACM
523#endif
524
1da177e4 525#endif /* _IP_H */