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 #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ 37 #define IPV4_MIN_MTU 68 /* RFC 791 */ 38 39 struct sock; 40 41 struct inet_skb_parm { 42 int iif; 43 struct ip_options opt; /* Compiled IP options */ 44 u16 flags; 45 46 #define IPSKB_FORWARDED BIT(0) 47 #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) 48 #define IPSKB_XFRM_TRANSFORMED BIT(2) 49 #define IPSKB_FRAG_COMPLETE BIT(3) 50 #define IPSKB_REROUTED BIT(4) 51 #define IPSKB_DOREDIRECT BIT(5) 52 #define IPSKB_FRAG_PMTU BIT(6) 53 #define IPSKB_L3SLAVE BIT(7) 54 55 u16 frag_max_size; 56 }; 57 58 static inline bool ipv4_l3mdev_skb(u16 flags) 59 { 60 return !!(flags & IPSKB_L3SLAVE); 61 } 62 63 static inline unsigned int ip_hdrlen(const struct sk_buff *skb) 64 { 65 return ip_hdr(skb)->ihl * 4; 66 } 67 68 struct ipcm_cookie { 69 struct sockcm_cookie sockc; 70 __be32 addr; 71 int oif; 72 struct ip_options_rcu *opt; 73 __u8 tx_flags; 74 __u8 ttl; 75 __s16 tos; 76 char priority; 77 }; 78 79 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 80 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) 81 82 /* return enslaved device index if relevant */ 83 static inline int inet_sdif(struct sk_buff *skb) 84 { 85 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 86 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) 87 return IPCB(skb)->iif; 88 #endif 89 return 0; 90 } 91 92 struct ip_ra_chain { 93 struct ip_ra_chain __rcu *next; 94 struct sock *sk; 95 union { 96 void (*destructor)(struct sock *); 97 struct sock *saved_sk; 98 }; 99 struct rcu_head rcu; 100 }; 101 102 extern struct ip_ra_chain __rcu *ip_ra_chain; 103 104 /* IP flags. */ 105 #define IP_CE 0x8000 /* Flag: "Congestion" */ 106 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 107 #define IP_MF 0x2000 /* Flag: "More Fragments" */ 108 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 109 110 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 111 112 struct msghdr; 113 struct net_device; 114 struct packet_type; 115 struct rtable; 116 struct sockaddr; 117 118 int igmp_mc_init(void); 119 120 /* 121 * Functions provided by ip.c 122 */ 123 124 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, 125 __be32 saddr, __be32 daddr, 126 struct ip_options_rcu *opt); 127 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 128 struct net_device *orig_dev); 129 int ip_local_deliver(struct sk_buff *skb); 130 int ip_mr_input(struct sk_buff *skb); 131 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); 132 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); 133 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 134 int (*output)(struct net *, struct sock *, struct sk_buff *)); 135 void ip_send_check(struct iphdr *ip); 136 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 137 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 138 139 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); 140 void ip_init(void); 141 int ip_append_data(struct sock *sk, struct flowi4 *fl4, 142 int getfrag(void *from, char *to, int offset, int len, 143 int odd, struct sk_buff *skb), 144 void *from, int len, int protolen, 145 struct ipcm_cookie *ipc, 146 struct rtable **rt, 147 unsigned int flags); 148 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, 149 struct sk_buff *skb); 150 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 151 int offset, size_t size, int flags); 152 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, 153 struct sk_buff_head *queue, 154 struct inet_cork *cork); 155 int ip_send_skb(struct net *net, struct sk_buff *skb); 156 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 157 void ip_flush_pending_frames(struct sock *sk); 158 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, 159 int getfrag(void *from, char *to, int offset, 160 int len, int odd, struct sk_buff *skb), 161 void *from, int length, int transhdrlen, 162 struct ipcm_cookie *ipc, struct rtable **rtp, 163 unsigned int flags); 164 165 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) 166 { 167 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); 168 } 169 170 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) 171 { 172 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); 173 } 174 175 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) 176 { 177 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); 178 } 179 180 /* datagram.c */ 181 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 182 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 183 184 void ip4_datagram_release_cb(struct sock *sk); 185 186 struct ip_reply_arg { 187 struct kvec iov[1]; 188 int flags; 189 __wsum csum; 190 int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 191 /* -1 if not needed */ 192 int bound_dev_if; 193 u8 tos; 194 kuid_t uid; 195 }; 196 197 #define IP_REPLY_ARG_NOSRCCHECK 1 198 199 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 200 { 201 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 202 } 203 204 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, 205 const struct ip_options *sopt, 206 __be32 daddr, __be32 saddr, 207 const struct ip_reply_arg *arg, 208 unsigned int len); 209 210 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 211 #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) 212 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 213 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 214 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 215 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 216 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 217 #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) 218 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 219 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 220 221 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); 222 unsigned long snmp_fold_field(void __percpu *mib, int offt); 223 #if BITS_PER_LONG==32 224 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 225 size_t syncp_offset); 226 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); 227 #else 228 static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 229 size_t syncp_offset) 230 { 231 return snmp_get_cpu_field(mib, cpu, offct); 232 233 } 234 235 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) 236 { 237 return snmp_fold_field(mib, offt); 238 } 239 #endif 240 241 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ 242 { \ 243 int i, c; \ 244 for_each_possible_cpu(c) { \ 245 for (i = 0; stats_list[i].name; i++) \ 246 buff64[i] += snmp_get_cpu_field64( \ 247 mib_statistic, \ 248 c, stats_list[i].entry, \ 249 offset); \ 250 } \ 251 } 252 253 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ 254 { \ 255 int i, c; \ 256 for_each_possible_cpu(c) { \ 257 for (i = 0; stats_list[i].name; i++) \ 258 buff[i] += snmp_get_cpu_field( \ 259 mib_statistic, \ 260 c, stats_list[i].entry); \ 261 } \ 262 } 263 264 void inet_get_local_port_range(struct net *net, int *low, int *high); 265 266 #ifdef CONFIG_SYSCTL 267 static inline int inet_is_local_reserved_port(struct net *net, int port) 268 { 269 if (!net->ipv4.sysctl_local_reserved_ports) 270 return 0; 271 return test_bit(port, net->ipv4.sysctl_local_reserved_ports); 272 } 273 274 static inline bool sysctl_dev_name_is_allowed(const char *name) 275 { 276 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; 277 } 278 279 static inline int inet_prot_sock(struct net *net) 280 { 281 return net->ipv4.sysctl_ip_prot_sock; 282 } 283 284 #else 285 static inline int inet_is_local_reserved_port(struct net *net, int port) 286 { 287 return 0; 288 } 289 290 static inline int inet_prot_sock(struct net *net) 291 { 292 return PROT_SOCK; 293 } 294 #endif 295 296 __be32 inet_current_timestamp(void); 297 298 /* From inetpeer.c */ 299 extern int inet_peer_threshold; 300 extern int inet_peer_minttl; 301 extern int inet_peer_maxttl; 302 303 void ipfrag_init(void); 304 305 void ip_static_sysctl_init(void); 306 307 #define IP4_REPLY_MARK(net, mark) \ 308 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) 309 310 static inline bool ip_is_fragment(const struct iphdr *iph) 311 { 312 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 313 } 314 315 #ifdef CONFIG_INET 316 #include <net/dst.h> 317 318 /* The function in 2.2 was invalid, producing wrong result for 319 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 320 static inline 321 int ip_decrease_ttl(struct iphdr *iph) 322 { 323 u32 check = (__force u32)iph->check; 324 check += (__force u32)htons(0x0100); 325 iph->check = (__force __sum16)(check + (check>=0xFFFF)); 326 return --iph->ttl; 327 } 328 329 static inline 330 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) 331 { 332 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); 333 334 return pmtudisc == IP_PMTUDISC_DO || 335 (pmtudisc == IP_PMTUDISC_WANT && 336 !(dst_metric_locked(dst, RTAX_MTU))); 337 } 338 339 static inline bool ip_sk_accept_pmtu(const struct sock *sk) 340 { 341 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && 342 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; 343 } 344 345 static inline bool ip_sk_use_pmtu(const struct sock *sk) 346 { 347 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; 348 } 349 350 static inline bool ip_sk_ignore_df(const struct sock *sk) 351 { 352 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || 353 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; 354 } 355 356 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, 357 bool forwarding) 358 { 359 struct net *net = dev_net(dst->dev); 360 361 if (net->ipv4.sysctl_ip_fwd_use_pmtu || 362 dst_metric_locked(dst, RTAX_MTU) || 363 !forwarding) 364 return dst_mtu(dst); 365 366 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); 367 } 368 369 static inline unsigned int ip_skb_dst_mtu(struct sock *sk, 370 const struct sk_buff *skb) 371 { 372 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { 373 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; 374 375 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); 376 } 377 378 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); 379 } 380 381 u32 ip_idents_reserve(u32 hash, int segs); 382 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); 383 384 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, 385 struct sock *sk, int segs) 386 { 387 struct iphdr *iph = ip_hdr(skb); 388 389 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { 390 /* This is only to work around buggy Windows95/2000 391 * VJ compression implementations. If the ID field 392 * does not change, they drop every other packet in 393 * a TCP stream using header compression. 394 */ 395 if (sk && inet_sk(sk)->inet_daddr) { 396 iph->id = htons(inet_sk(sk)->inet_id); 397 inet_sk(sk)->inet_id += segs; 398 } else { 399 iph->id = 0; 400 } 401 } else { 402 __ip_select_ident(net, iph, segs); 403 } 404 } 405 406 static inline void ip_select_ident(struct net *net, struct sk_buff *skb, 407 struct sock *sk) 408 { 409 ip_select_ident_segs(net, skb, sk, 1); 410 } 411 412 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) 413 { 414 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, 415 skb->len, proto, 0); 416 } 417 418 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store 419 * Equivalent to : flow->v4addrs.src = iph->saddr; 420 * flow->v4addrs.dst = iph->daddr; 421 */ 422 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, 423 const struct iphdr *iph) 424 { 425 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != 426 offsetof(typeof(flow->addrs), v4addrs.src) + 427 sizeof(flow->addrs.v4addrs.src)); 428 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); 429 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 430 } 431 432 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) 433 { 434 const struct iphdr *iph = skb_gro_network_header(skb); 435 436 return csum_tcpudp_nofold(iph->saddr, iph->daddr, 437 skb_gro_len(skb), proto, 0); 438 } 439 440 /* 441 * Map a multicast IP onto multicast MAC for type ethernet. 442 */ 443 444 static inline void ip_eth_mc_map(__be32 naddr, char *buf) 445 { 446 __u32 addr=ntohl(naddr); 447 buf[0]=0x01; 448 buf[1]=0x00; 449 buf[2]=0x5e; 450 buf[5]=addr&0xFF; 451 addr>>=8; 452 buf[4]=addr&0xFF; 453 addr>>=8; 454 buf[3]=addr&0x7F; 455 } 456 457 /* 458 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 459 * Leave P_Key as 0 to be filled in by driver. 460 */ 461 462 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 463 { 464 __u32 addr; 465 unsigned char scope = broadcast[5] & 0xF; 466 467 buf[0] = 0; /* Reserved */ 468 buf[1] = 0xff; /* Multicast QPN */ 469 buf[2] = 0xff; 470 buf[3] = 0xff; 471 addr = ntohl(naddr); 472 buf[4] = 0xff; 473 buf[5] = 0x10 | scope; /* scope from broadcast address */ 474 buf[6] = 0x40; /* IPv4 signature */ 475 buf[7] = 0x1b; 476 buf[8] = broadcast[8]; /* P_Key */ 477 buf[9] = broadcast[9]; 478 buf[10] = 0; 479 buf[11] = 0; 480 buf[12] = 0; 481 buf[13] = 0; 482 buf[14] = 0; 483 buf[15] = 0; 484 buf[19] = addr & 0xff; 485 addr >>= 8; 486 buf[18] = addr & 0xff; 487 addr >>= 8; 488 buf[17] = addr & 0xff; 489 addr >>= 8; 490 buf[16] = addr & 0x0f; 491 } 492 493 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 494 { 495 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 496 memcpy(buf, broadcast, 4); 497 else 498 memcpy(buf, &naddr, sizeof(naddr)); 499 } 500 501 #if IS_ENABLED(CONFIG_IPV6) 502 #include <linux/ipv6.h> 503 #endif 504 505 static __inline__ void inet_reset_saddr(struct sock *sk) 506 { 507 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 508 #if IS_ENABLED(CONFIG_IPV6) 509 if (sk->sk_family == PF_INET6) { 510 struct ipv6_pinfo *np = inet6_sk(sk); 511 512 memset(&np->saddr, 0, sizeof(np->saddr)); 513 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); 514 } 515 #endif 516 } 517 518 #endif 519 520 static inline unsigned int ipv4_addr_hash(__be32 ip) 521 { 522 return (__force unsigned int) ip; 523 } 524 525 bool ip_call_ra_chain(struct sk_buff *skb); 526 527 /* 528 * Functions provided by ip_fragment.c 529 */ 530 531 enum ip_defrag_users { 532 IP_DEFRAG_LOCAL_DELIVER, 533 IP_DEFRAG_CALL_RA_CHAIN, 534 IP_DEFRAG_CONNTRACK_IN, 535 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 536 IP_DEFRAG_CONNTRACK_OUT, 537 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 538 IP_DEFRAG_CONNTRACK_BRIDGE_IN, 539 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 540 IP_DEFRAG_VS_IN, 541 IP_DEFRAG_VS_OUT, 542 IP_DEFRAG_VS_FWD, 543 IP_DEFRAG_AF_PACKET, 544 IP_DEFRAG_MACVLAN, 545 }; 546 547 /* Return true if the value of 'user' is between 'lower_bond' 548 * and 'upper_bond' inclusively. 549 */ 550 static inline bool ip_defrag_user_in_between(u32 user, 551 enum ip_defrag_users lower_bond, 552 enum ip_defrag_users upper_bond) 553 { 554 return user >= lower_bond && user <= upper_bond; 555 } 556 557 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); 558 #ifdef CONFIG_INET 559 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); 560 #else 561 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) 562 { 563 return skb; 564 } 565 #endif 566 int ip_frag_mem(struct net *net); 567 568 /* 569 * Functions provided by ip_forward.c 570 */ 571 572 int ip_forward(struct sk_buff *skb); 573 574 /* 575 * Functions provided by ip_options.c 576 */ 577 578 void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 579 __be32 daddr, struct rtable *rt, int is_frag); 580 581 int __ip_options_echo(struct net *net, struct ip_options *dopt, 582 struct sk_buff *skb, const struct ip_options *sopt); 583 static inline int ip_options_echo(struct net *net, struct ip_options *dopt, 584 struct sk_buff *skb) 585 { 586 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); 587 } 588 589 void ip_options_fragment(struct sk_buff *skb); 590 int ip_options_compile(struct net *net, struct ip_options *opt, 591 struct sk_buff *skb); 592 int ip_options_get(struct net *net, struct ip_options_rcu **optp, 593 unsigned char *data, int optlen); 594 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 595 unsigned char __user *data, int optlen); 596 void ip_options_undo(struct ip_options *opt); 597 void ip_forward_options(struct sk_buff *skb); 598 int ip_options_rcv_srr(struct sk_buff *skb); 599 600 /* 601 * Functions provided by ip_sockglue.c 602 */ 603 604 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); 605 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 606 struct sk_buff *skb, int tlen, int offset); 607 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, 608 struct ipcm_cookie *ipc, bool allow_ipv6); 609 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 610 unsigned int optlen); 611 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 612 int __user *optlen); 613 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 614 char __user *optval, unsigned int optlen); 615 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 616 char __user *optval, int __user *optlen); 617 int ip_ra_control(struct sock *sk, unsigned char on, 618 void (*destructor)(struct sock *)); 619 620 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); 621 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 622 u32 info, u8 *payload); 623 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 624 u32 info); 625 626 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 627 { 628 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); 629 } 630 631 bool icmp_global_allow(void); 632 extern int sysctl_icmp_msgs_per_sec; 633 extern int sysctl_icmp_msgs_burst; 634 635 #ifdef CONFIG_PROC_FS 636 int ip_misc_proc_init(void); 637 #endif 638 639 #endif /* _IP_H */ 640