ip.h 18 KB

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