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Linux 4.16.11
[linux/fpc-iii.git] / include / net / ip.h
blobf49b3a576becfbac4e6077410a2f1fce9aaaee46
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 #include <linux/jhash.h>
30
31 #include <net/inet_sock.h>
32 #include <net/route.h>
33 #include <net/snmp.h>
34 #include <net/flow.h>
35 #include <net/flow_dissector.h>
36 #include <net/netns/hash.h>
37
38 #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
39 #define IPV4_MIN_MTU 68 /* RFC 791 */
40
41 struct sock;
42
43 struct inet_skb_parm {
44 int iif;
45 struct ip_options opt; /* Compiled IP options */
46 u16 flags;
47
48 #define IPSKB_FORWARDED BIT(0)
49 #define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
50 #define IPSKB_XFRM_TRANSFORMED BIT(2)
51 #define IPSKB_FRAG_COMPLETE BIT(3)
52 #define IPSKB_REROUTED BIT(4)
53 #define IPSKB_DOREDIRECT BIT(5)
54 #define IPSKB_FRAG_PMTU BIT(6)
55 #define IPSKB_L3SLAVE BIT(7)
56
57 u16 frag_max_size;
58 };
59
60 static inline bool ipv4_l3mdev_skb(u16 flags)
61 {
62 return !!(flags & IPSKB_L3SLAVE);
63 }
64
65 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
66 {
67 return ip_hdr(skb)->ihl * 4;
68 }
69
70 struct ipcm_cookie {
71 struct sockcm_cookie sockc;
72 __be32 addr;
73 int oif;
74 struct ip_options_rcu *opt;
75 __u8 tx_flags;
76 __u8 ttl;
77 __s16 tos;
78 char priority;
79 };
80
81 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
82 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
83
84 /* return enslaved device index if relevant */
85 static inline int inet_sdif(struct sk_buff *skb)
86 {
87 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
88 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
89 return IPCB(skb)->iif;
90 #endif
91 return 0;
92 }
93
94 struct ip_ra_chain {
95 struct ip_ra_chain __rcu *next;
96 struct sock *sk;
97 union {
98 void (*destructor)(struct sock *);
99 struct sock *saved_sk;
100 };
101 struct rcu_head rcu;
102 };
103
104 extern struct ip_ra_chain __rcu *ip_ra_chain;
105
106 /* IP flags. */
107 #define IP_CE 0x8000 /* Flag: "Congestion" */
108 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
109 #define IP_MF 0x2000 /* Flag: "More Fragments" */
110 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
111
112 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
113
114 struct msghdr;
115 struct net_device;
116 struct packet_type;
117 struct rtable;
118 struct sockaddr;
119
120 int igmp_mc_init(void);
121
122 /*
123 * Functions provided by ip.c
124 */
125
126 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
127 __be32 saddr, __be32 daddr,
128 struct ip_options_rcu *opt);
129 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
130 struct net_device *orig_dev);
131 int ip_local_deliver(struct sk_buff *skb);
132 int ip_mr_input(struct sk_buff *skb);
133 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
134 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
135 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
136 int (*output)(struct net *, struct sock *, struct sk_buff *));
137 void ip_send_check(struct iphdr *ip);
138 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
139 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
140
141 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
142 void ip_init(void);
143 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
144 int getfrag(void *from, char *to, int offset, int len,
145 int odd, struct sk_buff *skb),
146 void *from, int len, int protolen,
147 struct ipcm_cookie *ipc,
148 struct rtable **rt,
149 unsigned int flags);
150 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
151 struct sk_buff *skb);
152 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
153 int offset, size_t size, int flags);
154 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
155 struct sk_buff_head *queue,
156 struct inet_cork *cork);
157 int ip_send_skb(struct net *net, struct sk_buff *skb);
158 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
159 void ip_flush_pending_frames(struct sock *sk);
160 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
161 int getfrag(void *from, char *to, int offset,
162 int len, int odd, struct sk_buff *skb),
163 void *from, int length, int transhdrlen,
164 struct ipcm_cookie *ipc, struct rtable **rtp,
165 unsigned int flags);
166
167 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
168 {
169 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
170 }
171
172 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
173 {
174 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
175 }
176
177 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
178 {
179 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
180 }
181
182 /* datagram.c */
183 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
184 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
185
186 void ip4_datagram_release_cb(struct sock *sk);
187
188 struct ip_reply_arg {
189 struct kvec iov[1];
190 int flags;
191 __wsum csum;
192 int csumoffset; /* u16 offset of csum in iov[0].iov_base */
193 /* -1 if not needed */
194 int bound_dev_if;
195 u8 tos;
196 kuid_t uid;
197 };
198
199 #define IP_REPLY_ARG_NOSRCCHECK 1
200
201 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
202 {
203 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
204 }
205
206 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
207 const struct ip_options *sopt,
208 __be32 daddr, __be32 saddr,
209 const struct ip_reply_arg *arg,
210 unsigned int len);
211
212 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
213 #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
214 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
215 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
216 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
217 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
218 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
219 #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
220 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
221 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
222
223 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
224 unsigned long snmp_fold_field(void __percpu *mib, int offt);
225 #if BITS_PER_LONG==32
226 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
227 size_t syncp_offset);
228 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
229 #else
230 static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
231 size_t syncp_offset)
232 {
233 return snmp_get_cpu_field(mib, cpu, offct);
234
235 }
236
237 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
238 {
239 return snmp_fold_field(mib, offt);
240 }
241 #endif
242
243 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
244 { \
245 int i, c; \
246 for_each_possible_cpu(c) { \
247 for (i = 0; stats_list[i].name; i++) \
248 buff64[i] += snmp_get_cpu_field64( \
249 mib_statistic, \
250 c, stats_list[i].entry, \
251 offset); \
252 } \
253 }
254
255 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
256 { \
257 int i, c; \
258 for_each_possible_cpu(c) { \
259 for (i = 0; stats_list[i].name; i++) \
260 buff[i] += snmp_get_cpu_field( \
261 mib_statistic, \
262 c, stats_list[i].entry); \
263 } \
264 }
265
266 void inet_get_local_port_range(struct net *net, int *low, int *high);
267
268 #ifdef CONFIG_SYSCTL
269 static inline int inet_is_local_reserved_port(struct net *net, int port)
270 {
271 if (!net->ipv4.sysctl_local_reserved_ports)
272 return 0;
273 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
274 }
275
276 static inline bool sysctl_dev_name_is_allowed(const char *name)
277 {
278 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
279 }
280
281 static inline int inet_prot_sock(struct net *net)
282 {
283 return net->ipv4.sysctl_ip_prot_sock;
284 }
285
286 #else
287 static inline int inet_is_local_reserved_port(struct net *net, int port)
288 {
289 return 0;
290 }
291
292 static inline int inet_prot_sock(struct net *net)
293 {
294 return PROT_SOCK;
295 }
296 #endif
297
298 __be32 inet_current_timestamp(void);
299
300 /* From inetpeer.c */
301 extern int inet_peer_threshold;
302 extern int inet_peer_minttl;
303 extern int inet_peer_maxttl;
304
305 void ipfrag_init(void);
306
307 void ip_static_sysctl_init(void);
308
309 #define IP4_REPLY_MARK(net, mark) \
310 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
311
312 static inline bool ip_is_fragment(const struct iphdr *iph)
313 {
314 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
315 }
316
317 #ifdef CONFIG_INET
318 #include <net/dst.h>
319
320 /* The function in 2.2 was invalid, producing wrong result for
321 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
322 static inline
323 int ip_decrease_ttl(struct iphdr *iph)
324 {
325 u32 check = (__force u32)iph->check;
326 check += (__force u32)htons(0x0100);
327 iph->check = (__force __sum16)(check + (check>=0xFFFF));
328 return --iph->ttl;
329 }
330
331 static inline int ip_mtu_locked(const struct dst_entry *dst)
332 {
333 const struct rtable *rt = (const struct rtable *)dst;
334
335 return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
336 }
337
338 static inline
339 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
340 {
341 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
342
343 return pmtudisc == IP_PMTUDISC_DO ||
344 (pmtudisc == IP_PMTUDISC_WANT &&
345 !ip_mtu_locked(dst));
346 }
347
348 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
349 {
350 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
351 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
352 }
353
354 static inline bool ip_sk_use_pmtu(const struct sock *sk)
355 {
356 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
357 }
358
359 static inline bool ip_sk_ignore_df(const struct sock *sk)
360 {
361 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
362 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
363 }
364
365 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
366 bool forwarding)
367 {
368 struct net *net = dev_net(dst->dev);
369
370 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
371 ip_mtu_locked(dst) ||
372 !forwarding)
373 return dst_mtu(dst);
374
375 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
376 }
377
378 static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
379 const struct sk_buff *skb)
380 {
381 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
382 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
383
384 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
385 }
386
387 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
388 }
389
390 u32 ip_idents_reserve(u32 hash, int segs);
391 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
392
393 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
394 struct sock *sk, int segs)
395 {
396 struct iphdr *iph = ip_hdr(skb);
397
398 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
399 /* This is only to work around buggy Windows95/2000
400 * VJ compression implementations. If the ID field
401 * does not change, they drop every other packet in
402 * a TCP stream using header compression.
403 */
404 if (sk && inet_sk(sk)->inet_daddr) {
405 iph->id = htons(inet_sk(sk)->inet_id);
406 inet_sk(sk)->inet_id += segs;
407 } else {
408 iph->id = 0;
409 }
410 } else {
411 __ip_select_ident(net, iph, segs);
412 }
413 }
414
415 static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
416 struct sock *sk)
417 {
418 ip_select_ident_segs(net, skb, sk, 1);
419 }
420
421 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
422 {
423 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
424 skb->len, proto, 0);
425 }
426
427 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
428 * Equivalent to : flow->v4addrs.src = iph->saddr;
429 * flow->v4addrs.dst = iph->daddr;
430 */
431 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
432 const struct iphdr *iph)
433 {
434 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
435 offsetof(typeof(flow->addrs), v4addrs.src) +
436 sizeof(flow->addrs.v4addrs.src));
437 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
438 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
439 }
440
441 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
442 {
443 const struct iphdr *iph = skb_gro_network_header(skb);
444
445 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
446 skb_gro_len(skb), proto, 0);
447 }
448
449 /*
450 * Map a multicast IP onto multicast MAC for type ethernet.
451 */
452
453 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
454 {
455 __u32 addr=ntohl(naddr);
456 buf[0]=0x01;
457 buf[1]=0x00;
458 buf[2]=0x5e;
459 buf[5]=addr&0xFF;
460 addr>>=8;
461 buf[4]=addr&0xFF;
462 addr>>=8;
463 buf[3]=addr&0x7F;
464 }
465
466 /*
467 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
468 * Leave P_Key as 0 to be filled in by driver.
469 */
470
471 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
472 {
473 __u32 addr;
474 unsigned char scope = broadcast[5] & 0xF;
475
476 buf[0] = 0; /* Reserved */
477 buf[1] = 0xff; /* Multicast QPN */
478 buf[2] = 0xff;
479 buf[3] = 0xff;
480 addr = ntohl(naddr);
481 buf[4] = 0xff;
482 buf[5] = 0x10 | scope; /* scope from broadcast address */
483 buf[6] = 0x40; /* IPv4 signature */
484 buf[7] = 0x1b;
485 buf[8] = broadcast[8]; /* P_Key */
486 buf[9] = broadcast[9];
487 buf[10] = 0;
488 buf[11] = 0;
489 buf[12] = 0;
490 buf[13] = 0;
491 buf[14] = 0;
492 buf[15] = 0;
493 buf[19] = addr & 0xff;
494 addr >>= 8;
495 buf[18] = addr & 0xff;
496 addr >>= 8;
497 buf[17] = addr & 0xff;
498 addr >>= 8;
499 buf[16] = addr & 0x0f;
500 }
501
502 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
503 {
504 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
505 memcpy(buf, broadcast, 4);
506 else
507 memcpy(buf, &naddr, sizeof(naddr));
508 }
509
510 #if IS_ENABLED(CONFIG_IPV6)
511 #include <linux/ipv6.h>
512 #endif
513
514 static __inline__ void inet_reset_saddr(struct sock *sk)
515 {
516 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
517 #if IS_ENABLED(CONFIG_IPV6)
518 if (sk->sk_family == PF_INET6) {
519 struct ipv6_pinfo *np = inet6_sk(sk);
520
521 memset(&np->saddr, 0, sizeof(np->saddr));
522 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
523 }
524 #endif
525 }
526
527 #endif
528
529 static inline unsigned int ipv4_addr_hash(__be32 ip)
530 {
531 return (__force unsigned int) ip;
532 }
533
534 static inline u32 ipv4_portaddr_hash(const struct net *net,
535 __be32 saddr,
536 unsigned int port)
537 {
538 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
539 }
540
541 bool ip_call_ra_chain(struct sk_buff *skb);
542
543 /*
544 * Functions provided by ip_fragment.c
545 */
546
547 enum ip_defrag_users {
548 IP_DEFRAG_LOCAL_DELIVER,
549 IP_DEFRAG_CALL_RA_CHAIN,
550 IP_DEFRAG_CONNTRACK_IN,
551 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
552 IP_DEFRAG_CONNTRACK_OUT,
553 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
554 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
555 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
556 IP_DEFRAG_VS_IN,
557 IP_DEFRAG_VS_OUT,
558 IP_DEFRAG_VS_FWD,
559 IP_DEFRAG_AF_PACKET,
560 IP_DEFRAG_MACVLAN,
561 };
562
563 /* Return true if the value of 'user' is between 'lower_bond'
564 * and 'upper_bond' inclusively.
565 */
566 static inline bool ip_defrag_user_in_between(u32 user,
567 enum ip_defrag_users lower_bond,
568 enum ip_defrag_users upper_bond)
569 {
570 return user >= lower_bond && user <= upper_bond;
571 }
572
573 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
574 #ifdef CONFIG_INET
575 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
576 #else
577 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
578 {
579 return skb;
580 }
581 #endif
582 int ip_frag_mem(struct net *net);
583
584 /*
585 * Functions provided by ip_forward.c
586 */
587
588 int ip_forward(struct sk_buff *skb);
589
590 /*
591 * Functions provided by ip_options.c
592 */
593
594 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
595 __be32 daddr, struct rtable *rt, int is_frag);
596
597 int __ip_options_echo(struct net *net, struct ip_options *dopt,
598 struct sk_buff *skb, const struct ip_options *sopt);
599 static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
600 struct sk_buff *skb)
601 {
602 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
603 }
604
605 void ip_options_fragment(struct sk_buff *skb);
606 int ip_options_compile(struct net *net, struct ip_options *opt,
607 struct sk_buff *skb);
608 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
609 unsigned char *data, int optlen);
610 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
611 unsigned char __user *data, int optlen);
612 void ip_options_undo(struct ip_options *opt);
613 void ip_forward_options(struct sk_buff *skb);
614 int ip_options_rcv_srr(struct sk_buff *skb);
615
616 /*
617 * Functions provided by ip_sockglue.c
618 */
619
620 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
621 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
622 struct sk_buff *skb, int tlen, int offset);
623 int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
624 struct ipcm_cookie *ipc, bool allow_ipv6);
625 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
626 unsigned int optlen);
627 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
628 int __user *optlen);
629 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
630 char __user *optval, unsigned int optlen);
631 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
632 char __user *optval, int __user *optlen);
633 int ip_ra_control(struct sock *sk, unsigned char on,
634 void (*destructor)(struct sock *));
635
636 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
637 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
638 u32 info, u8 *payload);
639 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
640 u32 info);
641
642 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
643 {
644 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
645 }
646
647 bool icmp_global_allow(void);
648 extern int sysctl_icmp_msgs_per_sec;
649 extern int sysctl_icmp_msgs_burst;
650
651 #ifdef CONFIG_PROC_FS
652 int ip_misc_proc_init(void);
653 #endif
654
655 #endif /* _IP_H */
Linux with added FPC-III support