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 __u16 gso_size; 80 }; 81 82 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 83 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) 84 85 /* return enslaved device index if relevant */ 86 static inline int inet_sdif(struct sk_buff *skb) 87 { 88 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 89 if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) 90 return IPCB(skb)->iif; 91 #endif 92 return 0; 93 } 94 95 /* Special input handler for packets caught by router alert option. 96 They are selected only by protocol field, and then processed likely 97 local ones; but only if someone wants them! Otherwise, router 98 not running rsvpd will kill RSVP. 99 100 It is user level problem, what it will make with them. 101 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 102 but receiver should be enough clever f.e. to forward mtrace requests, 103 sent to multicast group to reach destination designated router. 104 */ 105 106 struct ip_ra_chain { 107 struct ip_ra_chain __rcu *next; 108 struct sock *sk; 109 union { 110 void (*destructor)(struct sock *); 111 struct sock *saved_sk; 112 }; 113 struct rcu_head rcu; 114 }; 115 116 /* IP flags. */ 117 #define IP_CE 0x8000 /* Flag: "Congestion" */ 118 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 119 #define IP_MF 0x2000 /* Flag: "More Fragments" */ 120 #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 121 122 #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 123 124 struct msghdr; 125 struct net_device; 126 struct packet_type; 127 struct rtable; 128 struct sockaddr; 129 130 int igmp_mc_init(void); 131 132 /* 133 * Functions provided by ip.c 134 */ 135 136 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, 137 __be32 saddr, __be32 daddr, 138 struct ip_options_rcu *opt); 139 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 140 struct net_device *orig_dev); 141 int ip_local_deliver(struct sk_buff *skb); 142 int ip_mr_input(struct sk_buff *skb); 143 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); 144 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); 145 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 146 int (*output)(struct net *, struct sock *, struct sk_buff *)); 147 void ip_send_check(struct iphdr *ip); 148 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 149 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 150 151 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); 152 void ip_init(void); 153 int ip_append_data(struct sock *sk, struct flowi4 *fl4, 154 int getfrag(void *from, char *to, int offset, int len, 155 int odd, struct sk_buff *skb), 156 void *from, int len, int protolen, 157 struct ipcm_cookie *ipc, 158 struct rtable **rt, 159 unsigned int flags); 160 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, 161 struct sk_buff *skb); 162 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 163 int offset, size_t size, int flags); 164 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, 165 struct sk_buff_head *queue, 166 struct inet_cork *cork); 167 int ip_send_skb(struct net *net, struct sk_buff *skb); 168 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 169 void ip_flush_pending_frames(struct sock *sk); 170 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, 171 int getfrag(void *from, char *to, int offset, 172 int len, int odd, struct sk_buff *skb), 173 void *from, int length, int transhdrlen, 174 struct ipcm_cookie *ipc, struct rtable **rtp, 175 struct inet_cork *cork, unsigned int flags); 176 177 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) 178 { 179 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); 180 } 181 182 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) 183 { 184 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); 185 } 186 187 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) 188 { 189 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); 190 } 191 192 /* datagram.c */ 193 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 194 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 195 196 void ip4_datagram_release_cb(struct sock *sk); 197 198 struct ip_reply_arg { 199 struct kvec iov[1]; 200 int flags; 201 __wsum csum; 202 int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 203 /* -1 if not needed */ 204 int bound_dev_if; 205 u8 tos; 206 kuid_t uid; 207 }; 208 209 #define IP_REPLY_ARG_NOSRCCHECK 1 210 211 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 212 { 213 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 214 } 215 216 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, 217 const struct ip_options *sopt, 218 __be32 daddr, __be32 saddr, 219 const struct ip_reply_arg *arg, 220 unsigned int len); 221 222 #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 223 #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) 224 #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 225 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_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 __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 228 #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 229 #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) 230 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 231 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 232 233 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); 234 unsigned long snmp_fold_field(void __percpu *mib, int offt); 235 #if BITS_PER_LONG==32 236 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 237 size_t syncp_offset); 238 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); 239 #else 240 static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 241 size_t syncp_offset) 242 { 243 return snmp_get_cpu_field(mib, cpu, offct); 244 245 } 246 247 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) 248 { 249 return snmp_fold_field(mib, offt); 250 } 251 #endif 252 253 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ 254 { \ 255 int i, c; \ 256 for_each_possible_cpu(c) { \ 257 for (i = 0; stats_list[i].name; i++) \ 258 buff64[i] += snmp_get_cpu_field64( \ 259 mib_statistic, \ 260 c, stats_list[i].entry, \ 261 offset); \ 262 } \ 263 } 264 265 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ 266 { \ 267 int i, c; \ 268 for_each_possible_cpu(c) { \ 269 for (i = 0; stats_list[i].name; i++) \ 270 buff[i] += snmp_get_cpu_field( \ 271 mib_statistic, \ 272 c, stats_list[i].entry); \ 273 } \ 274 } 275 276 void inet_get_local_port_range(struct net *net, int *low, int *high); 277 278 #ifdef CONFIG_SYSCTL 279 static inline int inet_is_local_reserved_port(struct net *net, int port) 280 { 281 if (!net->ipv4.sysctl_local_reserved_ports) 282 return 0; 283 return test_bit(port, net->ipv4.sysctl_local_reserved_ports); 284 } 285 286 static inline bool sysctl_dev_name_is_allowed(const char *name) 287 { 288 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; 289 } 290 291 static inline int inet_prot_sock(struct net *net) 292 { 293 return net->ipv4.sysctl_ip_prot_sock; 294 } 295 296 #else 297 static inline int inet_is_local_reserved_port(struct net *net, int port) 298 { 299 return 0; 300 } 301 302 static inline int inet_prot_sock(struct net *net) 303 { 304 return PROT_SOCK; 305 } 306 #endif 307 308 __be32 inet_current_timestamp(void); 309 310 /* From inetpeer.c */ 311 extern int inet_peer_threshold; 312 extern int inet_peer_minttl; 313 extern int inet_peer_maxttl; 314 315 void ipfrag_init(void); 316 317 void ip_static_sysctl_init(void); 318 319 #define IP4_REPLY_MARK(net, mark) \ 320 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) 321 322 static inline bool ip_is_fragment(const struct iphdr *iph) 323 { 324 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 325 } 326 327 #ifdef CONFIG_INET 328 #include <net/dst.h> 329 330 /* The function in 2.2 was invalid, producing wrong result for 331 * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 332 static inline 333 int ip_decrease_ttl(struct iphdr *iph) 334 { 335 u32 check = (__force u32)iph->check; 336 check += (__force u32)htons(0x0100); 337 iph->check = (__force __sum16)(check + (check>=0xFFFF)); 338 return --iph->ttl; 339 } 340 341 static inline int ip_mtu_locked(const struct dst_entry *dst) 342 { 343 const struct rtable *rt = (const struct rtable *)dst; 344 345 return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); 346 } 347 348 static inline 349 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) 350 { 351 u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); 352 353 return pmtudisc == IP_PMTUDISC_DO || 354 (pmtudisc == IP_PMTUDISC_WANT && 355 !ip_mtu_locked(dst)); 356 } 357 358 static inline bool ip_sk_accept_pmtu(const struct sock *sk) 359 { 360 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && 361 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; 362 } 363 364 static inline bool ip_sk_use_pmtu(const struct sock *sk) 365 { 366 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; 367 } 368 369 static inline bool ip_sk_ignore_df(const struct sock *sk) 370 { 371 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || 372 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; 373 } 374 375 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, 376 bool forwarding) 377 { 378 struct net *net = dev_net(dst->dev); 379 380 if (net->ipv4.sysctl_ip_fwd_use_pmtu || 381 ip_mtu_locked(dst) || 382 !forwarding) 383 return dst_mtu(dst); 384 385 return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); 386 } 387 388 static inline unsigned int ip_skb_dst_mtu(struct sock *sk, 389 const struct sk_buff *skb) 390 { 391 if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { 392 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; 393 394 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); 395 } 396 397 return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); 398 } 399 400 int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len, 401 u32 *metrics); 402 403 u32 ip_idents_reserve(u32 hash, int segs); 404 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); 405 406 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, 407 struct sock *sk, int segs) 408 { 409 struct iphdr *iph = ip_hdr(skb); 410 411 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { 412 /* This is only to work around buggy Windows95/2000 413 * VJ compression implementations. If the ID field 414 * does not change, they drop every other packet in 415 * a TCP stream using header compression. 416 */ 417 if (sk && inet_sk(sk)->inet_daddr) { 418 iph->id = htons(inet_sk(sk)->inet_id); 419 inet_sk(sk)->inet_id += segs; 420 } else { 421 iph->id = 0; 422 } 423 } else { 424 __ip_select_ident(net, iph, segs); 425 } 426 } 427 428 static inline void ip_select_ident(struct net *net, struct sk_buff *skb, 429 struct sock *sk) 430 { 431 ip_select_ident_segs(net, skb, sk, 1); 432 } 433 434 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) 435 { 436 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, 437 skb->len, proto, 0); 438 } 439 440 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store 441 * Equivalent to : flow->v4addrs.src = iph->saddr; 442 * flow->v4addrs.dst = iph->daddr; 443 */ 444 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, 445 const struct iphdr *iph) 446 { 447 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != 448 offsetof(typeof(flow->addrs), v4addrs.src) + 449 sizeof(flow->addrs.v4addrs.src)); 450 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); 451 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 452 } 453 454 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) 455 { 456 const struct iphdr *iph = skb_gro_network_header(skb); 457 458 return csum_tcpudp_nofold(iph->saddr, iph->daddr, 459 skb_gro_len(skb), proto, 0); 460 } 461 462 /* 463 * Map a multicast IP onto multicast MAC for type ethernet. 464 */ 465 466 static inline void ip_eth_mc_map(__be32 naddr, char *buf) 467 { 468 __u32 addr=ntohl(naddr); 469 buf[0]=0x01; 470 buf[1]=0x00; 471 buf[2]=0x5e; 472 buf[5]=addr&0xFF; 473 addr>>=8; 474 buf[4]=addr&0xFF; 475 addr>>=8; 476 buf[3]=addr&0x7F; 477 } 478 479 /* 480 * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 481 * Leave P_Key as 0 to be filled in by driver. 482 */ 483 484 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 485 { 486 __u32 addr; 487 unsigned char scope = broadcast[5] & 0xF; 488 489 buf[0] = 0; /* Reserved */ 490 buf[1] = 0xff; /* Multicast QPN */ 491 buf[2] = 0xff; 492 buf[3] = 0xff; 493 addr = ntohl(naddr); 494 buf[4] = 0xff; 495 buf[5] = 0x10 | scope; /* scope from broadcast address */ 496 buf[6] = 0x40; /* IPv4 signature */ 497 buf[7] = 0x1b; 498 buf[8] = broadcast[8]; /* P_Key */ 499 buf[9] = broadcast[9]; 500 buf[10] = 0; 501 buf[11] = 0; 502 buf[12] = 0; 503 buf[13] = 0; 504 buf[14] = 0; 505 buf[15] = 0; 506 buf[19] = addr & 0xff; 507 addr >>= 8; 508 buf[18] = addr & 0xff; 509 addr >>= 8; 510 buf[17] = addr & 0xff; 511 addr >>= 8; 512 buf[16] = addr & 0x0f; 513 } 514 515 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 516 { 517 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 518 memcpy(buf, broadcast, 4); 519 else 520 memcpy(buf, &naddr, sizeof(naddr)); 521 } 522 523 #if IS_ENABLED(CONFIG_IPV6) 524 #include <linux/ipv6.h> 525 #endif 526 527 static __inline__ void inet_reset_saddr(struct sock *sk) 528 { 529 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 530 #if IS_ENABLED(CONFIG_IPV6) 531 if (sk->sk_family == PF_INET6) { 532 struct ipv6_pinfo *np = inet6_sk(sk); 533 534 memset(&np->saddr, 0, sizeof(np->saddr)); 535 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); 536 } 537 #endif 538 } 539 540 #endif 541 542 static inline unsigned int ipv4_addr_hash(__be32 ip) 543 { 544 return (__force unsigned int) ip; 545 } 546 547 static inline u32 ipv4_portaddr_hash(const struct net *net, 548 __be32 saddr, 549 unsigned int port) 550 { 551 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; 552 } 553 554 bool ip_call_ra_chain(struct sk_buff *skb); 555 556 /* 557 * Functions provided by ip_fragment.c 558 */ 559 560 enum ip_defrag_users { 561 IP_DEFRAG_LOCAL_DELIVER, 562 IP_DEFRAG_CALL_RA_CHAIN, 563 IP_DEFRAG_CONNTRACK_IN, 564 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 565 IP_DEFRAG_CONNTRACK_OUT, 566 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 567 IP_DEFRAG_CONNTRACK_BRIDGE_IN, 568 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 569 IP_DEFRAG_VS_IN, 570 IP_DEFRAG_VS_OUT, 571 IP_DEFRAG_VS_FWD, 572 IP_DEFRAG_AF_PACKET, 573 IP_DEFRAG_MACVLAN, 574 }; 575 576 /* Return true if the value of 'user' is between 'lower_bond' 577 * and 'upper_bond' inclusively. 578 */ 579 static inline bool ip_defrag_user_in_between(u32 user, 580 enum ip_defrag_users lower_bond, 581 enum ip_defrag_users upper_bond) 582 { 583 return user >= lower_bond && user <= upper_bond; 584 } 585 586 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); 587 #ifdef CONFIG_INET 588 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); 589 #else 590 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) 591 { 592 return skb; 593 } 594 #endif 595 596 /* 597 * Functions provided by ip_forward.c 598 */ 599 600 int ip_forward(struct sk_buff *skb); 601 602 /* 603 * Functions provided by ip_options.c 604 */ 605 606 void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 607 __be32 daddr, struct rtable *rt, int is_frag); 608 609 int __ip_options_echo(struct net *net, struct ip_options *dopt, 610 struct sk_buff *skb, const struct ip_options *sopt); 611 static inline int ip_options_echo(struct net *net, struct ip_options *dopt, 612 struct sk_buff *skb) 613 { 614 return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt); 615 } 616 617 void ip_options_fragment(struct sk_buff *skb); 618 int ip_options_compile(struct net *net, struct ip_options *opt, 619 struct sk_buff *skb); 620 int ip_options_get(struct net *net, struct ip_options_rcu **optp, 621 unsigned char *data, int optlen); 622 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 623 unsigned char __user *data, int optlen); 624 void ip_options_undo(struct ip_options *opt); 625 void ip_forward_options(struct sk_buff *skb); 626 int ip_options_rcv_srr(struct sk_buff *skb); 627 628 /* 629 * Functions provided by ip_sockglue.c 630 */ 631 632 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); 633 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 634 struct sk_buff *skb, int tlen, int offset); 635 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, 636 struct ipcm_cookie *ipc, bool allow_ipv6); 637 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 638 unsigned int optlen); 639 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 640 int __user *optlen); 641 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 642 char __user *optval, unsigned int optlen); 643 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 644 char __user *optval, int __user *optlen); 645 int ip_ra_control(struct sock *sk, unsigned char on, 646 void (*destructor)(struct sock *)); 647 648 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); 649 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 650 u32 info, u8 *payload); 651 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 652 u32 info); 653 654 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 655 { 656 ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0); 657 } 658 659 bool icmp_global_allow(void); 660 extern int sysctl_icmp_msgs_per_sec; 661 extern int sysctl_icmp_msgs_burst; 662 663 #ifdef CONFIG_PROC_FS 664 int ip_misc_proc_init(void); 665 #endif 666 667 int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, 668 struct netlink_ext_ack *extack); 669 670 #endif /* _IP_H */ 671