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 #include <linux/jhash.h> 30 31 #include <net/inet_sock.h> 32 #include <net/route.h> 33 #include <net/snmp.h> 34 #include <net/flow.h> 35 #include <net/flow_dissector.h> 36 #include <net/netns/hash.h> 37 38 #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ 39 #define IPV4_MIN_MTU 68 /* RFC 791 */ 40 41 struct sock; 42 43 struct inet_skb_parm { 44 int iif; 45 struct ip_options opt; /* Compiled IP options */ 46 u16 flags; 47 48 #define IPSKB_FORWARDED BIT(0) 49 #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) 50 #define IPSKB_XFRM_TRANSFORMED BIT(2) 51 #define IPSKB_FRAG_COMPLETE BIT(3) 52 #define IPSKB_REROUTED BIT(4) 53 #define IPSKB_DOREDIRECT BIT(5) 54 #define IPSKB_FRAG_PMTU BIT(6) 55 #define IPSKB_L3SLAVE BIT(7) 56 57 u16 frag_max_size; 58 }; 59 60 static inline bool ipv4_l3mdev_skb(u16 flags) 61 { 62 return !!(flags & IPSKB_L3SLAVE); 63 } 64 65 static inline unsigned int ip_hdrlen(const struct sk_buff *skb) 66 { 67 return ip_hdr(skb)->ihl * 4; 68 } 69 70 struct ipcm_cookie { 71 struct sockcm_cookie sockc; 72 __be32 addr; 73 int oif; 74 struct ip_options_rcu *opt; 75 __u8 tx_flags; 76 __u8 ttl; 77 __s16 tos; 78 char priority; 79 }; 80 81 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 82 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) 83 84 /* return enslaved device index if relevant */ 85 static inline int inet_sdif(struct sk_buff *skb) 86 { 87 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 88 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) 89 return IPCB(skb)->iif; 90 #endif 91 return 0; 92 } 93 94 /* Special input handler for packets caught by router alert option. 95 They are selected only by protocol field, and then processed likely 96 local ones; but only if someone wants them! Otherwise, router 97 not running rsvpd will kill RSVP. 98 99 It is user level problem, what it will make with them. 100 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 101 but receiver should be enough clever f.e. to forward mtrace requests, 102 sent to multicast group to reach destination designated router. 103 */ 104 105 struct ip_ra_chain { 106 struct ip_ra_chain __rcu *next; 107 struct sock *sk; 108 union { 109 void (*destructor)(struct sock *); 110 struct sock *saved_sk; 111 }; 112 struct rcu_head rcu; 113 }; 114 115 /* IP flags. */ 116 #define IP_CE 0x8000 /* Flag: "Congestion" */ 117 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 118 #define IP_MF 0x2000 /* Flag: "More Fragments" */ 119 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 120 121 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 122 123 struct msghdr; 124 struct net_device; 125 struct packet_type; 126 struct rtable; 127 struct sockaddr; 128 129 int igmp_mc_init(void); 130 131 /* 132 * Functions provided by ip.c 133 */ 134 135 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, 136 __be32 saddr, __be32 daddr, 137 struct ip_options_rcu *opt); 138 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 139 struct net_device *orig_dev); 140 int ip_local_deliver(struct sk_buff *skb); 141 int ip_mr_input(struct sk_buff *skb); 142 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); 143 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); 144 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 145 int (*output)(struct net *, struct sock *, struct sk_buff *)); 146 void ip_send_check(struct iphdr *ip); 147 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 148 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 149 150 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); 151 void ip_init(void); 152 int ip_append_data(struct sock *sk, struct flowi4 *fl4, 153 int getfrag(void *from, char *to, int offset, int len, 154 int odd, struct sk_buff *skb), 155 void *from, int len, int protolen, 156 struct ipcm_cookie *ipc, 157 struct rtable **rt, 158 unsigned int flags); 159 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, 160 struct sk_buff *skb); 161 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 162 int offset, size_t size, int flags); 163 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, 164 struct sk_buff_head *queue, 165 struct inet_cork *cork); 166 int ip_send_skb(struct net *net, struct sk_buff *skb); 167 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 168 void ip_flush_pending_frames(struct sock *sk); 169 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, 170 int getfrag(void *from, char *to, int offset, 171 int len, int odd, struct sk_buff *skb), 172 void *from, int length, int transhdrlen, 173 struct ipcm_cookie *ipc, struct rtable **rtp, 174 unsigned int flags); 175 176 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) 177 { 178 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); 179 } 180 181 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) 182 { 183 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); 184 } 185 186 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) 187 { 188 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); 189 } 190 191 /* datagram.c */ 192 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 193 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 194 195 void ip4_datagram_release_cb(struct sock *sk); 196 197 struct ip_reply_arg { 198 struct kvec iov[1]; 199 int flags; 200 __wsum csum; 201 int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 202 /* -1 if not needed */ 203 int bound_dev_if; 204 u8 tos; 205 kuid_t uid; 206 }; 207 208 #define IP_REPLY_ARG_NOSRCCHECK 1 209 210 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 211 { 212 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 213 } 214 215 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, 216 const struct ip_options *sopt, 217 __be32 daddr, __be32 saddr, 218 const struct ip_reply_arg *arg, 219 unsigned int len); 220 221 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 222 #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) 223 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 224 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 225 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 226 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 227 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 228 #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) 229 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 230 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 231 232 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); 233 unsigned long snmp_fold_field(void __percpu *mib, int offt); 234 #if BITS_PER_LONG==32 235 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 236 size_t syncp_offset); 237 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); 238 #else 239 static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 240 size_t syncp_offset) 241 { 242 return snmp_get_cpu_field(mib, cpu, offct); 243 244 } 245 246 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) 247 { 248 return snmp_fold_field(mib, offt); 249 } 250 #endif 251 252 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ 253 { \ 254 int i, c; \ 255 for_each_possible_cpu(c) { \ 256 for (i = 0; stats_list[i].name; i++) \ 257 buff64[i] += snmp_get_cpu_field64( \ 258 mib_statistic, \ 259 c, stats_list[i].entry, \ 260 offset); \ 261 } \ 262 } 263 264 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ 265 { \ 266 int i, c; \ 267 for_each_possible_cpu(c) { \ 268 for (i = 0; stats_list[i].name; i++) \ 269 buff[i] += snmp_get_cpu_field( \ 270 mib_statistic, \ 271 c, stats_list[i].entry); \ 272 } \ 273 } 274 275 void inet_get_local_port_range(struct net *net, int *low, int *high); 276 277 #ifdef CONFIG_SYSCTL 278 static inline int inet_is_local_reserved_port(struct net *net, int port) 279 { 280 if (!net->ipv4.sysctl_local_reserved_ports) 281 return 0; 282 return test_bit(port, net->ipv4.sysctl_local_reserved_ports); 283 } 284 285 static inline bool sysctl_dev_name_is_allowed(const char *name) 286 { 287 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; 288 } 289 290 static inline int inet_prot_sock(struct net *net) 291 { 292 return net->ipv4.sysctl_ip_prot_sock; 293 } 294 295 #else 296 static inline int inet_is_local_reserved_port(struct net *net, int port) 297 { 298 return 0; 299 } 300 301 static inline int inet_prot_sock(struct net *net) 302 { 303 return PROT_SOCK; 304 } 305 #endif 306 307 __be32 inet_current_timestamp(void); 308 309 /* From inetpeer.c */ 310 extern int inet_peer_threshold; 311 extern int inet_peer_minttl; 312 extern int inet_peer_maxttl; 313 314 void ipfrag_init(void); 315 316 void ip_static_sysctl_init(void); 317 318 #define IP4_REPLY_MARK(net, mark) \ 319 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) 320 321 static inline bool ip_is_fragment(const struct iphdr *iph) 322 { 323 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 324 } 325 326 #ifdef CONFIG_INET 327 #include <net/dst.h> 328 329 /* The function in 2.2 was invalid, producing wrong result for 330 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 331 static inline 332 int ip_decrease_ttl(struct iphdr *iph) 333 { 334 u32 check = (__force u32)iph->check; 335 check += (__force u32)htons(0x0100); 336 iph->check = (__force __sum16)(check + (check>=0xFFFF)); 337 return --iph->ttl; 338 } 339 340 static inline int ip_mtu_locked(const struct dst_entry *dst) 341 { 342 const struct rtable *rt = (const struct rtable *)dst; 343 344 return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); 345 } 346 347 static inline 348 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) 349 { 350 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); 351 352 return pmtudisc == IP_PMTUDISC_DO || 353 (pmtudisc == IP_PMTUDISC_WANT && 354 !ip_mtu_locked(dst)); 355 } 356 357 static inline bool ip_sk_accept_pmtu(const struct sock *sk) 358 { 359 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && 360 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; 361 } 362 363 static inline bool ip_sk_use_pmtu(const struct sock *sk) 364 { 365 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; 366 } 367 368 static inline bool ip_sk_ignore_df(const struct sock *sk) 369 { 370 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || 371 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; 372 } 373 374 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, 375 bool forwarding) 376 { 377 struct net *net = dev_net(dst->dev); 378 379 if (net->ipv4.sysctl_ip_fwd_use_pmtu || 380 ip_mtu_locked(dst) || 381 !forwarding) 382 return dst_mtu(dst); 383 384 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); 385 } 386 387 static inline unsigned int ip_skb_dst_mtu(struct sock *sk, 388 const struct sk_buff *skb) 389 { 390 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { 391 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; 392 393 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); 394 } 395 396 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); 397 } 398 399 u32 ip_idents_reserve(u32 hash, int segs); 400 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); 401 402 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, 403 struct sock *sk, int segs) 404 { 405 struct iphdr *iph = ip_hdr(skb); 406 407 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { 408 /* This is only to work around buggy Windows95/2000 409 * VJ compression implementations. If the ID field 410 * does not change, they drop every other packet in 411 * a TCP stream using header compression. 412 */ 413 if (sk && inet_sk(sk)->inet_daddr) { 414 iph->id = htons(inet_sk(sk)->inet_id); 415 inet_sk(sk)->inet_id += segs; 416 } else { 417 iph->id = 0; 418 } 419 } else { 420 __ip_select_ident(net, iph, segs); 421 } 422 } 423 424 static inline void ip_select_ident(struct net *net, struct sk_buff *skb, 425 struct sock *sk) 426 { 427 ip_select_ident_segs(net, skb, sk, 1); 428 } 429 430 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) 431 { 432 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, 433 skb->len, proto, 0); 434 } 435 436 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store 437 * Equivalent to : flow->v4addrs.src = iph->saddr; 438 * flow->v4addrs.dst = iph->daddr; 439 */ 440 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, 441 const struct iphdr *iph) 442 { 443 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != 444 offsetof(typeof(flow->addrs), v4addrs.src) + 445 sizeof(flow->addrs.v4addrs.src)); 446 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); 447 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 448 } 449 450 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) 451 { 452 const struct iphdr *iph = skb_gro_network_header(skb); 453 454 return csum_tcpudp_nofold(iph->saddr, iph->daddr, 455 skb_gro_len(skb), proto, 0); 456 } 457 458 /* 459 * Map a multicast IP onto multicast MAC for type ethernet. 460 */ 461 462 static inline void ip_eth_mc_map(__be32 naddr, char *buf) 463 { 464 __u32 addr=ntohl(naddr); 465 buf[0]=0x01; 466 buf[1]=0x00; 467 buf[2]=0x5e; 468 buf[5]=addr&0xFF; 469 addr>>=8; 470 buf[4]=addr&0xFF; 471 addr>>=8; 472 buf[3]=addr&0x7F; 473 } 474 475 /* 476 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 477 * Leave P_Key as 0 to be filled in by driver. 478 */ 479 480 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 481 { 482 __u32 addr; 483 unsigned char scope = broadcast[5] & 0xF; 484 485 buf[0] = 0; /* Reserved */ 486 buf[1] = 0xff; /* Multicast QPN */ 487 buf[2] = 0xff; 488 buf[3] = 0xff; 489 addr = ntohl(naddr); 490 buf[4] = 0xff; 491 buf[5] = 0x10 | scope; /* scope from broadcast address */ 492 buf[6] = 0x40; /* IPv4 signature */ 493 buf[7] = 0x1b; 494 buf[8] = broadcast[8]; /* P_Key */ 495 buf[9] = broadcast[9]; 496 buf[10] = 0; 497 buf[11] = 0; 498 buf[12] = 0; 499 buf[13] = 0; 500 buf[14] = 0; 501 buf[15] = 0; 502 buf[19] = addr & 0xff; 503 addr >>= 8; 504 buf[18] = addr & 0xff; 505 addr >>= 8; 506 buf[17] = addr & 0xff; 507 addr >>= 8; 508 buf[16] = addr & 0x0f; 509 } 510 511 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 512 { 513 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 514 memcpy(buf, broadcast, 4); 515 else 516 memcpy(buf, &naddr, sizeof(naddr)); 517 } 518 519 #if IS_ENABLED(CONFIG_IPV6) 520 #include <linux/ipv6.h> 521 #endif 522 523 static __inline__ void inet_reset_saddr(struct sock *sk) 524 { 525 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 526 #if IS_ENABLED(CONFIG_IPV6) 527 if (sk->sk_family == PF_INET6) { 528 struct ipv6_pinfo *np = inet6_sk(sk); 529 530 memset(&np->saddr, 0, sizeof(np->saddr)); 531 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); 532 } 533 #endif 534 } 535 536 #endif 537 538 static inline unsigned int ipv4_addr_hash(__be32 ip) 539 { 540 return (__force unsigned int) ip; 541 } 542 543 static inline u32 ipv4_portaddr_hash(const struct net *net, 544 __be32 saddr, 545 unsigned int port) 546 { 547 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; 548 } 549 550 bool ip_call_ra_chain(struct sk_buff *skb); 551 552 /* 553 * Functions provided by ip_fragment.c 554 */ 555 556 enum ip_defrag_users { 557 IP_DEFRAG_LOCAL_DELIVER, 558 IP_DEFRAG_CALL_RA_CHAIN, 559 IP_DEFRAG_CONNTRACK_IN, 560 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 561 IP_DEFRAG_CONNTRACK_OUT, 562 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 563 IP_DEFRAG_CONNTRACK_BRIDGE_IN, 564 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 565 IP_DEFRAG_VS_IN, 566 IP_DEFRAG_VS_OUT, 567 IP_DEFRAG_VS_FWD, 568 IP_DEFRAG_AF_PACKET, 569 IP_DEFRAG_MACVLAN, 570 }; 571 572 /* Return true if the value of 'user' is between 'lower_bond' 573 * and 'upper_bond' inclusively. 574 */ 575 static inline bool ip_defrag_user_in_between(u32 user, 576 enum ip_defrag_users lower_bond, 577 enum ip_defrag_users upper_bond) 578 { 579 return user >= lower_bond && user <= upper_bond; 580 } 581 582 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); 583 #ifdef CONFIG_INET 584 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); 585 #else 586 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) 587 { 588 return skb; 589 } 590 #endif 591 592 /* 593 * Functions provided by ip_forward.c 594 */ 595 596 int ip_forward(struct sk_buff *skb); 597 598 /* 599 * Functions provided by ip_options.c 600 */ 601 602 void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 603 __be32 daddr, struct rtable *rt, int is_frag); 604 605 int __ip_options_echo(struct net *net, struct ip_options *dopt, 606 struct sk_buff *skb, const struct ip_options *sopt); 607 static inline int ip_options_echo(struct net *net, struct ip_options *dopt, 608 struct sk_buff *skb) 609 { 610 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); 611 } 612 613 void ip_options_fragment(struct sk_buff *skb); 614 int ip_options_compile(struct net *net, struct ip_options *opt, 615 struct sk_buff *skb); 616 int ip_options_get(struct net *net, struct ip_options_rcu **optp, 617 unsigned char *data, int optlen); 618 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 619 unsigned char __user *data, int optlen); 620 void ip_options_undo(struct ip_options *opt); 621 void ip_forward_options(struct sk_buff *skb); 622 int ip_options_rcv_srr(struct sk_buff *skb); 623 624 /* 625 * Functions provided by ip_sockglue.c 626 */ 627 628 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); 629 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 630 struct sk_buff *skb, int tlen, int offset); 631 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, 632 struct ipcm_cookie *ipc, bool allow_ipv6); 633 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 634 unsigned int optlen); 635 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 636 int __user *optlen); 637 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 638 char __user *optval, unsigned int optlen); 639 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 640 char __user *optval, int __user *optlen); 641 int ip_ra_control(struct sock *sk, unsigned char on, 642 void (*destructor)(struct sock *)); 643 644 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); 645 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 646 u32 info, u8 *payload); 647 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 648 u32 info); 649 650 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 651 { 652 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); 653 } 654 655 bool icmp_global_allow(void); 656 extern int sysctl_icmp_msgs_per_sec; 657 extern int sysctl_icmp_msgs_burst; 658 659 #ifdef CONFIG_PROC_FS 660 int ip_misc_proc_init(void); 661 #endif 662 663 #endif /* _IP_H */ 664