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 kuid_t uid; 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 static inline int inet_prot_sock(struct net *net) 267 { 268 return net->ipv4.sysctl_ip_prot_sock; 269 } 270 271 #else 272 static inline int inet_is_local_reserved_port(struct net *net, int port) 273 { 274 return 0; 275 } 276 277 static inline int inet_prot_sock(struct net *net) 278 { 279 return PROT_SOCK; 280 } 281 #endif 282 283 __be32 inet_current_timestamp(void); 284 285 /* From inetpeer.c */ 286 extern int inet_peer_threshold; 287 extern int inet_peer_minttl; 288 extern int inet_peer_maxttl; 289 290 void ipfrag_init(void); 291 292 void ip_static_sysctl_init(void); 293 294 #define IP4_REPLY_MARK(net, mark) \ 295 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) 296 297 static inline bool ip_is_fragment(const struct iphdr *iph) 298 { 299 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 300 } 301 302 #ifdef CONFIG_INET 303 #include <net/dst.h> 304 305 /* The function in 2.2 was invalid, producing wrong result for 306 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 307 static inline 308 int ip_decrease_ttl(struct iphdr *iph) 309 { 310 u32 check = (__force u32)iph->check; 311 check += (__force u32)htons(0x0100); 312 iph->check = (__force __sum16)(check + (check>=0xFFFF)); 313 return --iph->ttl; 314 } 315 316 static inline 317 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) 318 { 319 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); 320 321 return pmtudisc == IP_PMTUDISC_DO || 322 (pmtudisc == IP_PMTUDISC_WANT && 323 !(dst_metric_locked(dst, RTAX_MTU))); 324 } 325 326 static inline bool ip_sk_accept_pmtu(const struct sock *sk) 327 { 328 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && 329 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; 330 } 331 332 static inline bool ip_sk_use_pmtu(const struct sock *sk) 333 { 334 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; 335 } 336 337 static inline bool ip_sk_ignore_df(const struct sock *sk) 338 { 339 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || 340 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; 341 } 342 343 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, 344 bool forwarding) 345 { 346 struct net *net = dev_net(dst->dev); 347 348 if (net->ipv4.sysctl_ip_fwd_use_pmtu || 349 dst_metric_locked(dst, RTAX_MTU) || 350 !forwarding) 351 return dst_mtu(dst); 352 353 return min(dst->dev->mtu, IP_MAX_MTU); 354 } 355 356 static inline unsigned int ip_skb_dst_mtu(struct sock *sk, 357 const struct sk_buff *skb) 358 { 359 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { 360 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; 361 362 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); 363 } 364 365 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU); 366 } 367 368 u32 ip_idents_reserve(u32 hash, int segs); 369 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); 370 371 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, 372 struct sock *sk, int segs) 373 { 374 struct iphdr *iph = ip_hdr(skb); 375 376 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { 377 /* This is only to work around buggy Windows95/2000 378 * VJ compression implementations. If the ID field 379 * does not change, they drop every other packet in 380 * a TCP stream using header compression. 381 */ 382 if (sk && inet_sk(sk)->inet_daddr) { 383 iph->id = htons(inet_sk(sk)->inet_id); 384 inet_sk(sk)->inet_id += segs; 385 } else { 386 iph->id = 0; 387 } 388 } else { 389 __ip_select_ident(net, iph, segs); 390 } 391 } 392 393 static inline void ip_select_ident(struct net *net, struct sk_buff *skb, 394 struct sock *sk) 395 { 396 ip_select_ident_segs(net, skb, sk, 1); 397 } 398 399 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) 400 { 401 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, 402 skb->len, proto, 0); 403 } 404 405 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store 406 * Equivalent to : flow->v4addrs.src = iph->saddr; 407 * flow->v4addrs.dst = iph->daddr; 408 */ 409 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, 410 const struct iphdr *iph) 411 { 412 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != 413 offsetof(typeof(flow->addrs), v4addrs.src) + 414 sizeof(flow->addrs.v4addrs.src)); 415 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); 416 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 417 } 418 419 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) 420 { 421 const struct iphdr *iph = skb_gro_network_header(skb); 422 423 return csum_tcpudp_nofold(iph->saddr, iph->daddr, 424 skb_gro_len(skb), proto, 0); 425 } 426 427 /* 428 * Map a multicast IP onto multicast MAC for type ethernet. 429 */ 430 431 static inline void ip_eth_mc_map(__be32 naddr, char *buf) 432 { 433 __u32 addr=ntohl(naddr); 434 buf[0]=0x01; 435 buf[1]=0x00; 436 buf[2]=0x5e; 437 buf[5]=addr&0xFF; 438 addr>>=8; 439 buf[4]=addr&0xFF; 440 addr>>=8; 441 buf[3]=addr&0x7F; 442 } 443 444 /* 445 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 446 * Leave P_Key as 0 to be filled in by driver. 447 */ 448 449 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 450 { 451 __u32 addr; 452 unsigned char scope = broadcast[5] & 0xF; 453 454 buf[0] = 0; /* Reserved */ 455 buf[1] = 0xff; /* Multicast QPN */ 456 buf[2] = 0xff; 457 buf[3] = 0xff; 458 addr = ntohl(naddr); 459 buf[4] = 0xff; 460 buf[5] = 0x10 | scope; /* scope from broadcast address */ 461 buf[6] = 0x40; /* IPv4 signature */ 462 buf[7] = 0x1b; 463 buf[8] = broadcast[8]; /* P_Key */ 464 buf[9] = broadcast[9]; 465 buf[10] = 0; 466 buf[11] = 0; 467 buf[12] = 0; 468 buf[13] = 0; 469 buf[14] = 0; 470 buf[15] = 0; 471 buf[19] = addr & 0xff; 472 addr >>= 8; 473 buf[18] = addr & 0xff; 474 addr >>= 8; 475 buf[17] = addr & 0xff; 476 addr >>= 8; 477 buf[16] = addr & 0x0f; 478 } 479 480 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 481 { 482 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 483 memcpy(buf, broadcast, 4); 484 else 485 memcpy(buf, &naddr, sizeof(naddr)); 486 } 487 488 #if IS_ENABLED(CONFIG_IPV6) 489 #include <linux/ipv6.h> 490 #endif 491 492 static __inline__ void inet_reset_saddr(struct sock *sk) 493 { 494 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 495 #if IS_ENABLED(CONFIG_IPV6) 496 if (sk->sk_family == PF_INET6) { 497 struct ipv6_pinfo *np = inet6_sk(sk); 498 499 memset(&np->saddr, 0, sizeof(np->saddr)); 500 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); 501 } 502 #endif 503 } 504 505 #endif 506 507 static inline unsigned int ipv4_addr_hash(__be32 ip) 508 { 509 return (__force unsigned int) ip; 510 } 511 512 bool ip_call_ra_chain(struct sk_buff *skb); 513 514 /* 515 * Functions provided by ip_fragment.c 516 */ 517 518 enum ip_defrag_users { 519 IP_DEFRAG_LOCAL_DELIVER, 520 IP_DEFRAG_CALL_RA_CHAIN, 521 IP_DEFRAG_CONNTRACK_IN, 522 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 523 IP_DEFRAG_CONNTRACK_OUT, 524 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 525 IP_DEFRAG_CONNTRACK_BRIDGE_IN, 526 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 527 IP_DEFRAG_VS_IN, 528 IP_DEFRAG_VS_OUT, 529 IP_DEFRAG_VS_FWD, 530 IP_DEFRAG_AF_PACKET, 531 IP_DEFRAG_MACVLAN, 532 }; 533 534 /* Return true if the value of 'user' is between 'lower_bond' 535 * and 'upper_bond' inclusively. 536 */ 537 static inline bool ip_defrag_user_in_between(u32 user, 538 enum ip_defrag_users lower_bond, 539 enum ip_defrag_users upper_bond) 540 { 541 return user >= lower_bond && user <= upper_bond; 542 } 543 544 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); 545 #ifdef CONFIG_INET 546 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); 547 #else 548 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) 549 { 550 return skb; 551 } 552 #endif 553 int ip_frag_mem(struct net *net); 554 555 /* 556 * Functions provided by ip_forward.c 557 */ 558 559 int ip_forward(struct sk_buff *skb); 560 561 /* 562 * Functions provided by ip_options.c 563 */ 564 565 void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 566 __be32 daddr, struct rtable *rt, int is_frag); 567 568 int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb, 569 const struct ip_options *sopt); 570 static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) 571 { 572 return __ip_options_echo(dopt, skb, &IPCB(skb)->opt); 573 } 574 575 void ip_options_fragment(struct sk_buff *skb); 576 int ip_options_compile(struct net *net, struct ip_options *opt, 577 struct sk_buff *skb); 578 int ip_options_get(struct net *net, struct ip_options_rcu **optp, 579 unsigned char *data, int optlen); 580 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 581 unsigned char __user *data, int optlen); 582 void ip_options_undo(struct ip_options *opt); 583 void ip_forward_options(struct sk_buff *skb); 584 int ip_options_rcv_srr(struct sk_buff *skb); 585 586 /* 587 * Functions provided by ip_sockglue.c 588 */ 589 590 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); 591 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 592 struct sk_buff *skb, int tlen, int offset); 593 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, 594 struct ipcm_cookie *ipc, bool allow_ipv6); 595 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 596 unsigned int optlen); 597 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 598 int __user *optlen); 599 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 600 char __user *optval, unsigned int optlen); 601 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 602 char __user *optval, int __user *optlen); 603 int ip_ra_control(struct sock *sk, unsigned char on, 604 void (*destructor)(struct sock *)); 605 606 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); 607 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 608 u32 info, u8 *payload); 609 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 610 u32 info); 611 612 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 613 { 614 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); 615 } 616 617 bool icmp_global_allow(void); 618 extern int sysctl_icmp_msgs_per_sec; 619 extern int sysctl_icmp_msgs_burst; 620 621 #ifdef CONFIG_PROC_FS 622 int ip_misc_proc_init(void); 623 #endif 624 625 #endif /* _IP_H */ 626