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