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