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