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