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 *
10 * Authors: Ross Biro
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
25 #include <linux/types.h>
26 #include <linux/ip.h>
27 #include <linux/in.h>
28 #include <linux/skbuff.h>
29
30 #include <net/inet_sock.h>
31 #include <net/route.h>
32 #include <net/snmp.h>
33 #include <net/flow.h>
34 #include <net/flow_keys.h>
35
36 #define IPV4_MIN_MTU 68 /* RFC 791 */
37
38 struct sock;
39
40 struct inet_skb_parm {
41 struct ip_options opt; /* Compiled IP options */
42 unsigned char flags;
43
44 #define IPSKB_FORWARDED BIT(0)
45 #define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
46 #define IPSKB_XFRM_TRANSFORMED BIT(2)
47 #define IPSKB_FRAG_COMPLETE BIT(3)
48 #define IPSKB_REROUTED BIT(4)
49 #define IPSKB_DOREDIRECT BIT(5)
50
51 u16 frag_max_size;
52 };
53
ip_hdrlen(const struct sk_buff * skb)54 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
55 {
56 return ip_hdr(skb)->ihl * 4;
57 }
58
59 struct ipcm_cookie {
60 __be32 addr;
61 int oif;
62 struct ip_options_rcu *opt;
63 __u8 tx_flags;
64 __u8 ttl;
65 __s16 tos;
66 char priority;
67 };
68
69 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
70 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
71
72 struct ip_ra_chain {
73 struct ip_ra_chain __rcu *next;
74 struct sock *sk;
75 union {
76 void (*destructor)(struct sock *);
77 struct sock *saved_sk;
78 };
79 struct rcu_head rcu;
80 };
81
82 extern struct ip_ra_chain __rcu *ip_ra_chain;
83
84 /* IP flags. */
85 #define IP_CE 0x8000 /* Flag: "Congestion" */
86 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
87 #define IP_MF 0x2000 /* Flag: "More Fragments" */
88 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
89
90 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
91
92 struct msghdr;
93 struct net_device;
94 struct packet_type;
95 struct rtable;
96 struct sockaddr;
97
98 int igmp_mc_init(void);
99
100 /*
101 * Functions provided by ip.c
102 */
103
104 int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
105 __be32 saddr, __be32 daddr,
106 struct ip_options_rcu *opt);
107 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
108 struct net_device *orig_dev);
109 int ip_local_deliver(struct sk_buff *skb);
110 int ip_mr_input(struct sk_buff *skb);
111 int ip_output(struct sock *sk, struct sk_buff *skb);
112 int ip_mc_output(struct sock *sk, struct sk_buff *skb);
113 int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
114 int ip_do_nat(struct sk_buff *skb);
115 void ip_send_check(struct iphdr *ip);
116 int __ip_local_out(struct sk_buff *skb);
117 int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
ip_local_out(struct sk_buff * skb)118 static inline int ip_local_out(struct sk_buff *skb)
119 {
120 return ip_local_out_sk(skb->sk, skb);
121 }
122
123 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
124 void ip_init(void);
125 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
126 int getfrag(void *from, char *to, int offset, int len,
127 int odd, struct sk_buff *skb),
128 void *from, int len, int protolen,
129 struct ipcm_cookie *ipc,
130 struct rtable **rt,
131 unsigned int flags);
132 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
133 struct sk_buff *skb);
134 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
135 int offset, size_t size, int flags);
136 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
137 struct sk_buff_head *queue,
138 struct inet_cork *cork);
139 int ip_send_skb(struct net *net, struct sk_buff *skb);
140 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
141 void ip_flush_pending_frames(struct sock *sk);
142 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
143 int getfrag(void *from, char *to, int offset,
144 int len, int odd, struct sk_buff *skb),
145 void *from, int length, int transhdrlen,
146 struct ipcm_cookie *ipc, struct rtable **rtp,
147 unsigned int flags);
148
ip_finish_skb(struct sock * sk,struct flowi4 * fl4)149 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
150 {
151 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
152 }
153
get_rttos(struct ipcm_cookie * ipc,struct inet_sock * inet)154 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
155 {
156 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
157 }
158
get_rtconn_flags(struct ipcm_cookie * ipc,struct sock * sk)159 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
160 {
161 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
162 }
163
164 /* datagram.c */
165 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
166 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
167
168 void ip4_datagram_release_cb(struct sock *sk);
169
170 struct ip_reply_arg {
171 struct kvec iov[1];
172 int flags;
173 __wsum csum;
174 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
175 /* -1 if not needed */
176 int bound_dev_if;
177 u8 tos;
178 kuid_t uid;
179 };
180
181 #define IP_REPLY_ARG_NOSRCCHECK 1
182
ip_reply_arg_flowi_flags(const struct ip_reply_arg * arg)183 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
184 {
185 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
186 }
187
188 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
189 const struct ip_options *sopt,
190 __be32 daddr, __be32 saddr,
191 const struct ip_reply_arg *arg,
192 unsigned int len);
193
194 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
195 #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
196 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
197 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
198 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
199 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
200 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
201 #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
202 #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
203 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
204 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
205 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
206
207 unsigned long snmp_fold_field(void __percpu *mib, int offt);
208 #if BITS_PER_LONG==32
209 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
210 #else
snmp_fold_field64(void __percpu * mib,int offt,size_t syncp_off)211 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
212 {
213 return snmp_fold_field(mib, offt);
214 }
215 #endif
216
217 void inet_get_local_port_range(struct net *net, int *low, int *high);
218
219 #ifdef CONFIG_SYSCTL
inet_is_local_reserved_port(struct net * net,int port)220 static inline int inet_is_local_reserved_port(struct net *net, int port)
221 {
222 if (!net->ipv4.sysctl_local_reserved_ports)
223 return 0;
224 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
225 }
226
sysctl_dev_name_is_allowed(const char * name)227 static inline bool sysctl_dev_name_is_allowed(const char *name)
228 {
229 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
230 }
231
232 #else
inet_is_local_reserved_port(struct net * net,int port)233 static inline int inet_is_local_reserved_port(struct net *net, int port)
234 {
235 return 0;
236 }
237 #endif
238
239 __be32 inet_current_timestamp(void);
240
241 /* From inetpeer.c */
242 extern int inet_peer_threshold;
243 extern int inet_peer_minttl;
244 extern int inet_peer_maxttl;
245
246 /* From ip_input.c */
247 extern int sysctl_ip_early_demux;
248
249 /* From ip_output.c */
250 extern int sysctl_ip_dynaddr;
251
252 void ipfrag_init(void);
253
254 void ip_static_sysctl_init(void);
255
256 #define IP4_REPLY_MARK(net, mark) \
257 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
258
ip_is_fragment(const struct iphdr * iph)259 static inline bool ip_is_fragment(const struct iphdr *iph)
260 {
261 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
262 }
263
264 #ifdef CONFIG_INET
265 #include <net/dst.h>
266
267 /* The function in 2.2 was invalid, producing wrong result for
268 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
269 static inline
ip_decrease_ttl(struct iphdr * iph)270 int ip_decrease_ttl(struct iphdr *iph)
271 {
272 u32 check = (__force u32)iph->check;
273 check += (__force u32)htons(0x0100);
274 iph->check = (__force __sum16)(check + (check>=0xFFFF));
275 return --iph->ttl;
276 }
277
278 static inline
ip_dont_fragment(struct sock * sk,struct dst_entry * dst)279 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
280 {
281 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
282 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
283 !(dst_metric_locked(dst, RTAX_MTU)));
284 }
285
ip_sk_accept_pmtu(const struct sock * sk)286 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
287 {
288 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
289 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
290 }
291
ip_sk_use_pmtu(const struct sock * sk)292 static inline bool ip_sk_use_pmtu(const struct sock *sk)
293 {
294 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
295 }
296
ip_sk_ignore_df(const struct sock * sk)297 static inline bool ip_sk_ignore_df(const struct sock *sk)
298 {
299 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
300 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
301 }
302
ip_dst_mtu_maybe_forward(const struct dst_entry * dst,bool forwarding)303 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
304 bool forwarding)
305 {
306 struct net *net = dev_net(dst->dev);
307
308 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
309 dst_metric_locked(dst, RTAX_MTU) ||
310 !forwarding)
311 return dst_mtu(dst);
312
313 return min(dst->dev->mtu, IP_MAX_MTU);
314 }
315
ip_skb_dst_mtu(const struct sk_buff * skb)316 static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
317 {
318 if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
319 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
320 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
321 } else {
322 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
323 }
324 }
325
326 u32 ip_idents_reserve(u32 hash, int segs);
327 void __ip_select_ident(struct iphdr *iph, int segs);
328
ip_select_ident_segs(struct sk_buff * skb,struct sock * sk,int segs)329 static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
330 {
331 struct iphdr *iph = ip_hdr(skb);
332
333 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
334 /* This is only to work around buggy Windows95/2000
335 * VJ compression implementations. If the ID field
336 * does not change, they drop every other packet in
337 * a TCP stream using header compression.
338 */
339 if (sk && inet_sk(sk)->inet_daddr) {
340 iph->id = htons(inet_sk(sk)->inet_id);
341 inet_sk(sk)->inet_id += segs;
342 } else {
343 iph->id = 0;
344 }
345 } else {
346 __ip_select_ident(iph, segs);
347 }
348 }
349
ip_select_ident(struct sk_buff * skb,struct sock * sk)350 static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
351 {
352 ip_select_ident_segs(skb, sk, 1);
353 }
354
inet_compute_pseudo(struct sk_buff * skb,int proto)355 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
356 {
357 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
358 skb->len, proto, 0);
359 }
360
inet_set_txhash(struct sock * sk)361 static inline void inet_set_txhash(struct sock *sk)
362 {
363 struct inet_sock *inet = inet_sk(sk);
364 struct flow_keys keys;
365
366 keys.src = inet->inet_saddr;
367 keys.dst = inet->inet_daddr;
368 keys.port16[0] = inet->inet_sport;
369 keys.port16[1] = inet->inet_dport;
370
371 sk->sk_txhash = flow_hash_from_keys(&keys);
372 }
373
inet_gro_compute_pseudo(struct sk_buff * skb,int proto)374 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
375 {
376 const struct iphdr *iph = skb_gro_network_header(skb);
377
378 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
379 skb_gro_len(skb), proto, 0);
380 }
381
382 /*
383 * Map a multicast IP onto multicast MAC for type ethernet.
384 */
385
ip_eth_mc_map(__be32 naddr,char * buf)386 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
387 {
388 __u32 addr=ntohl(naddr);
389 buf[0]=0x01;
390 buf[1]=0x00;
391 buf[2]=0x5e;
392 buf[5]=addr&0xFF;
393 addr>>=8;
394 buf[4]=addr&0xFF;
395 addr>>=8;
396 buf[3]=addr&0x7F;
397 }
398
399 /*
400 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
401 * Leave P_Key as 0 to be filled in by driver.
402 */
403
ip_ib_mc_map(__be32 naddr,const unsigned char * broadcast,char * buf)404 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
405 {
406 __u32 addr;
407 unsigned char scope = broadcast[5] & 0xF;
408
409 buf[0] = 0; /* Reserved */
410 buf[1] = 0xff; /* Multicast QPN */
411 buf[2] = 0xff;
412 buf[3] = 0xff;
413 addr = ntohl(naddr);
414 buf[4] = 0xff;
415 buf[5] = 0x10 | scope; /* scope from broadcast address */
416 buf[6] = 0x40; /* IPv4 signature */
417 buf[7] = 0x1b;
418 buf[8] = broadcast[8]; /* P_Key */
419 buf[9] = broadcast[9];
420 buf[10] = 0;
421 buf[11] = 0;
422 buf[12] = 0;
423 buf[13] = 0;
424 buf[14] = 0;
425 buf[15] = 0;
426 buf[19] = addr & 0xff;
427 addr >>= 8;
428 buf[18] = addr & 0xff;
429 addr >>= 8;
430 buf[17] = addr & 0xff;
431 addr >>= 8;
432 buf[16] = addr & 0x0f;
433 }
434
ip_ipgre_mc_map(__be32 naddr,const unsigned char * broadcast,char * buf)435 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
436 {
437 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
438 memcpy(buf, broadcast, 4);
439 else
440 memcpy(buf, &naddr, sizeof(naddr));
441 }
442
443 #if IS_ENABLED(CONFIG_IPV6)
444 #include <linux/ipv6.h>
445 #endif
446
inet_reset_saddr(struct sock * sk)447 static __inline__ void inet_reset_saddr(struct sock *sk)
448 {
449 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
450 #if IS_ENABLED(CONFIG_IPV6)
451 if (sk->sk_family == PF_INET6) {
452 struct ipv6_pinfo *np = inet6_sk(sk);
453
454 memset(&np->saddr, 0, sizeof(np->saddr));
455 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
456 }
457 #endif
458 }
459
460 #endif
461
462 bool ip_call_ra_chain(struct sk_buff *skb);
463
464 /*
465 * Functions provided by ip_fragment.c
466 */
467
468 enum ip_defrag_users {
469 IP_DEFRAG_LOCAL_DELIVER,
470 IP_DEFRAG_CALL_RA_CHAIN,
471 IP_DEFRAG_CONNTRACK_IN,
472 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
473 IP_DEFRAG_CONNTRACK_OUT,
474 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
475 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
476 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
477 IP_DEFRAG_VS_IN,
478 IP_DEFRAG_VS_OUT,
479 IP_DEFRAG_VS_FWD,
480 IP_DEFRAG_AF_PACKET,
481 IP_DEFRAG_MACVLAN,
482 };
483
484 int ip_defrag(struct sk_buff *skb, u32 user);
485 #ifdef CONFIG_INET
486 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
487 #else
ip_check_defrag(struct sk_buff * skb,u32 user)488 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
489 {
490 return skb;
491 }
492 #endif
493 int ip_frag_mem(struct net *net);
494
495 /*
496 * Functions provided by ip_forward.c
497 */
498
499 int ip_forward(struct sk_buff *skb);
500
501 /*
502 * Functions provided by ip_options.c
503 */
504
505 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
506 __be32 daddr, struct rtable *rt, int is_frag);
507
508 int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
509 const struct ip_options *sopt);
ip_options_echo(struct ip_options * dopt,struct sk_buff * skb)510 static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
511 {
512 return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
513 }
514
515 void ip_options_fragment(struct sk_buff *skb);
516 int ip_options_compile(struct net *net, struct ip_options *opt,
517 struct sk_buff *skb);
518 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
519 unsigned char *data, int optlen);
520 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
521 unsigned char __user *data, int optlen);
522 void ip_options_undo(struct ip_options *opt);
523 void ip_forward_options(struct sk_buff *skb);
524 int ip_options_rcv_srr(struct sk_buff *skb);
525
526 /*
527 * Functions provided by ip_sockglue.c
528 */
529
530 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
531 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
532 int ip_cmsg_send(struct net *net, struct msghdr *msg,
533 struct ipcm_cookie *ipc, bool allow_ipv6);
534 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
535 unsigned int optlen);
536 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
537 int __user *optlen);
538 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
539 char __user *optval, unsigned int optlen);
540 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
541 char __user *optval, int __user *optlen);
542 int ip_ra_control(struct sock *sk, unsigned char on,
543 void (*destructor)(struct sock *));
544
545 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
546 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
547 u32 info, u8 *payload);
548 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
549 u32 info);
550
551 bool icmp_global_allow(void);
552 extern int sysctl_icmp_msgs_per_sec;
553 extern int sysctl_icmp_msgs_burst;
554
555 #ifdef CONFIG_PROC_FS
556 int ip_misc_proc_init(void);
557 #endif
558
559 #endif /* _IP_H */
560