1 /* 2 * common UDP/RAW code 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #include <linux/capability.h> 15 #include <linux/errno.h> 16 #include <linux/types.h> 17 #include <linux/kernel.h> 18 #include <linux/interrupt.h> 19 #include <linux/socket.h> 20 #include <linux/sockios.h> 21 #include <linux/in6.h> 22 #include <linux/ipv6.h> 23 #include <linux/route.h> 24 #include <linux/slab.h> 25 #include <linux/export.h> 26 27 #include <net/ipv6.h> 28 #include <net/ndisc.h> 29 #include <net/addrconf.h> 30 #include <net/transp_v6.h> 31 #include <net/ip6_route.h> 32 #include <net/tcp_states.h> 33 #include <net/dsfield.h> 34 35 #include <linux/errqueue.h> 36 #include <asm/uaccess.h> 37 38 static bool ipv6_mapped_addr_any(const struct in6_addr *a) 39 { 40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); 41 } 42 43 static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk) 44 { 45 struct inet_sock *inet = inet_sk(sk); 46 struct ipv6_pinfo *np = inet6_sk(sk); 47 48 memset(fl6, 0, sizeof(*fl6)); 49 fl6->flowi6_proto = sk->sk_protocol; 50 fl6->daddr = sk->sk_v6_daddr; 51 fl6->saddr = np->saddr; 52 fl6->flowi6_oif = sk->sk_bound_dev_if; 53 fl6->flowi6_mark = sk->sk_mark; 54 fl6->fl6_dport = inet->inet_dport; 55 fl6->fl6_sport = inet->inet_sport; 56 fl6->flowlabel = np->flow_label; 57 58 if (!fl6->flowi6_oif) 59 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 60 61 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) 62 fl6->flowi6_oif = np->mcast_oif; 63 64 security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 65 } 66 67 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) 68 { 69 struct ip6_flowlabel *flowlabel = NULL; 70 struct in6_addr *final_p, final; 71 struct ipv6_txoptions *opt; 72 struct dst_entry *dst; 73 struct inet_sock *inet = inet_sk(sk); 74 struct ipv6_pinfo *np = inet6_sk(sk); 75 struct flowi6 fl6; 76 int err = 0; 77 78 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { 79 flowlabel = fl6_sock_lookup(sk, np->flow_label); 80 if (!flowlabel) 81 return -EINVAL; 82 } 83 ip6_datagram_flow_key_init(&fl6, sk); 84 85 rcu_read_lock(); 86 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); 87 final_p = fl6_update_dst(&fl6, opt, &final); 88 rcu_read_unlock(); 89 90 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 91 if (IS_ERR(dst)) { 92 err = PTR_ERR(dst); 93 goto out; 94 } 95 96 if (fix_sk_saddr) { 97 if (ipv6_addr_any(&np->saddr)) 98 np->saddr = fl6.saddr; 99 100 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 101 sk->sk_v6_rcv_saddr = fl6.saddr; 102 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 103 if (sk->sk_prot->rehash) 104 sk->sk_prot->rehash(sk); 105 } 106 } 107 108 ip6_dst_store(sk, dst, 109 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 110 &sk->sk_v6_daddr : NULL, 111 #ifdef CONFIG_IPV6_SUBTREES 112 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 113 &np->saddr : 114 #endif 115 NULL); 116 117 out: 118 fl6_sock_release(flowlabel); 119 return err; 120 } 121 122 void ip6_datagram_release_cb(struct sock *sk) 123 { 124 struct dst_entry *dst; 125 126 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) 127 return; 128 129 rcu_read_lock(); 130 dst = __sk_dst_get(sk); 131 if (!dst || !dst->obsolete || 132 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) { 133 rcu_read_unlock(); 134 return; 135 } 136 rcu_read_unlock(); 137 138 ip6_datagram_dst_update(sk, false); 139 } 140 EXPORT_SYMBOL_GPL(ip6_datagram_release_cb); 141 142 static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 143 { 144 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 145 struct inet_sock *inet = inet_sk(sk); 146 struct ipv6_pinfo *np = inet6_sk(sk); 147 struct in6_addr *daddr; 148 int addr_type; 149 int err; 150 __be32 fl6_flowlabel = 0; 151 152 if (usin->sin6_family == AF_INET) { 153 if (__ipv6_only_sock(sk)) 154 return -EAFNOSUPPORT; 155 err = __ip4_datagram_connect(sk, uaddr, addr_len); 156 goto ipv4_connected; 157 } 158 159 if (addr_len < SIN6_LEN_RFC2133) 160 return -EINVAL; 161 162 if (usin->sin6_family != AF_INET6) 163 return -EAFNOSUPPORT; 164 165 if (np->sndflow) 166 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 167 168 addr_type = ipv6_addr_type(&usin->sin6_addr); 169 170 if (addr_type == IPV6_ADDR_ANY) { 171 /* 172 * connect to self 173 */ 174 usin->sin6_addr.s6_addr[15] = 0x01; 175 } 176 177 daddr = &usin->sin6_addr; 178 179 if (addr_type == IPV6_ADDR_MAPPED) { 180 struct sockaddr_in sin; 181 182 if (__ipv6_only_sock(sk)) { 183 err = -ENETUNREACH; 184 goto out; 185 } 186 sin.sin_family = AF_INET; 187 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 188 sin.sin_port = usin->sin6_port; 189 190 err = __ip4_datagram_connect(sk, 191 (struct sockaddr *) &sin, 192 sizeof(sin)); 193 194 ipv4_connected: 195 if (err) 196 goto out; 197 198 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 199 200 if (ipv6_addr_any(&np->saddr) || 201 ipv6_mapped_addr_any(&np->saddr)) 202 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 203 204 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 205 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 206 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 207 &sk->sk_v6_rcv_saddr); 208 if (sk->sk_prot->rehash) 209 sk->sk_prot->rehash(sk); 210 } 211 212 goto out; 213 } 214 215 if (__ipv6_addr_needs_scope_id(addr_type)) { 216 if (addr_len >= sizeof(struct sockaddr_in6) && 217 usin->sin6_scope_id) { 218 if (sk->sk_bound_dev_if && 219 sk->sk_bound_dev_if != usin->sin6_scope_id) { 220 err = -EINVAL; 221 goto out; 222 } 223 sk->sk_bound_dev_if = usin->sin6_scope_id; 224 } 225 226 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 227 sk->sk_bound_dev_if = np->mcast_oif; 228 229 /* Connect to link-local address requires an interface */ 230 if (!sk->sk_bound_dev_if) { 231 err = -EINVAL; 232 goto out; 233 } 234 } 235 236 sk->sk_v6_daddr = *daddr; 237 np->flow_label = fl6_flowlabel; 238 239 inet->inet_dport = usin->sin6_port; 240 241 /* 242 * Check for a route to destination an obtain the 243 * destination cache for it. 244 */ 245 246 err = ip6_datagram_dst_update(sk, true); 247 if (err) 248 goto out; 249 250 sk->sk_state = TCP_ESTABLISHED; 251 sk_set_txhash(sk); 252 out: 253 return err; 254 } 255 256 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 257 { 258 int res; 259 260 lock_sock(sk); 261 res = __ip6_datagram_connect(sk, uaddr, addr_len); 262 release_sock(sk); 263 return res; 264 } 265 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 266 267 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 268 int addr_len) 269 { 270 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 271 if (sin6->sin6_family != AF_INET6) 272 return -EAFNOSUPPORT; 273 return ip6_datagram_connect(sk, uaddr, addr_len); 274 } 275 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 276 277 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 278 __be16 port, u32 info, u8 *payload) 279 { 280 struct ipv6_pinfo *np = inet6_sk(sk); 281 struct icmp6hdr *icmph = icmp6_hdr(skb); 282 struct sock_exterr_skb *serr; 283 284 if (!np->recverr) 285 return; 286 287 skb = skb_clone(skb, GFP_ATOMIC); 288 if (!skb) 289 return; 290 291 skb->protocol = htons(ETH_P_IPV6); 292 293 serr = SKB_EXT_ERR(skb); 294 serr->ee.ee_errno = err; 295 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 296 serr->ee.ee_type = icmph->icmp6_type; 297 serr->ee.ee_code = icmph->icmp6_code; 298 serr->ee.ee_pad = 0; 299 serr->ee.ee_info = info; 300 serr->ee.ee_data = 0; 301 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 302 skb_network_header(skb); 303 serr->port = port; 304 305 __skb_pull(skb, payload - skb->data); 306 skb_reset_transport_header(skb); 307 308 if (sock_queue_err_skb(sk, skb)) 309 kfree_skb(skb); 310 } 311 312 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 313 { 314 const struct ipv6_pinfo *np = inet6_sk(sk); 315 struct sock_exterr_skb *serr; 316 struct ipv6hdr *iph; 317 struct sk_buff *skb; 318 319 if (!np->recverr) 320 return; 321 322 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 323 if (!skb) 324 return; 325 326 skb->protocol = htons(ETH_P_IPV6); 327 328 skb_put(skb, sizeof(struct ipv6hdr)); 329 skb_reset_network_header(skb); 330 iph = ipv6_hdr(skb); 331 iph->daddr = fl6->daddr; 332 333 serr = SKB_EXT_ERR(skb); 334 serr->ee.ee_errno = err; 335 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 336 serr->ee.ee_type = 0; 337 serr->ee.ee_code = 0; 338 serr->ee.ee_pad = 0; 339 serr->ee.ee_info = info; 340 serr->ee.ee_data = 0; 341 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 342 serr->port = fl6->fl6_dport; 343 344 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 345 skb_reset_transport_header(skb); 346 347 if (sock_queue_err_skb(sk, skb)) 348 kfree_skb(skb); 349 } 350 351 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 352 { 353 struct ipv6_pinfo *np = inet6_sk(sk); 354 struct ipv6hdr *iph; 355 struct sk_buff *skb; 356 struct ip6_mtuinfo *mtu_info; 357 358 if (!np->rxopt.bits.rxpmtu) 359 return; 360 361 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 362 if (!skb) 363 return; 364 365 skb_put(skb, sizeof(struct ipv6hdr)); 366 skb_reset_network_header(skb); 367 iph = ipv6_hdr(skb); 368 iph->daddr = fl6->daddr; 369 370 mtu_info = IP6CBMTU(skb); 371 372 mtu_info->ip6m_mtu = mtu; 373 mtu_info->ip6m_addr.sin6_family = AF_INET6; 374 mtu_info->ip6m_addr.sin6_port = 0; 375 mtu_info->ip6m_addr.sin6_flowinfo = 0; 376 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 377 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 378 379 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 380 skb_reset_transport_header(skb); 381 382 skb = xchg(&np->rxpmtu, skb); 383 kfree_skb(skb); 384 } 385 386 /* For some errors we have valid addr_offset even with zero payload and 387 * zero port. Also, addr_offset should be supported if port is set. 388 */ 389 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 390 { 391 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 392 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 393 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 394 } 395 396 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 397 * 398 * At one point, excluding local errors was a quick test to identify icmp/icmp6 399 * errors. This is no longer true, but the test remained, so the v6 stack, 400 * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 401 * 402 * Timestamp code paths do not initialize the fields expected by cmsg: 403 * the PKTINFO fields in skb->cb[]. Fill those in here. 404 */ 405 static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 406 struct sock_exterr_skb *serr) 407 { 408 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 409 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 410 return true; 411 412 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 413 return false; 414 415 if (!skb->dev) 416 return false; 417 418 if (skb->protocol == htons(ETH_P_IPV6)) 419 IP6CB(skb)->iif = skb->dev->ifindex; 420 else 421 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 422 423 return true; 424 } 425 426 /* 427 * Handle MSG_ERRQUEUE 428 */ 429 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 430 { 431 struct ipv6_pinfo *np = inet6_sk(sk); 432 struct sock_exterr_skb *serr; 433 struct sk_buff *skb; 434 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 435 struct { 436 struct sock_extended_err ee; 437 struct sockaddr_in6 offender; 438 } errhdr; 439 int err; 440 int copied; 441 442 err = -EAGAIN; 443 skb = sock_dequeue_err_skb(sk); 444 if (!skb) 445 goto out; 446 447 copied = skb->len; 448 if (copied > len) { 449 msg->msg_flags |= MSG_TRUNC; 450 copied = len; 451 } 452 err = skb_copy_datagram_msg(skb, 0, msg, copied); 453 if (err) 454 goto out_free_skb; 455 456 sock_recv_timestamp(msg, sk, skb); 457 458 serr = SKB_EXT_ERR(skb); 459 460 if (sin && ipv6_datagram_support_addr(serr)) { 461 const unsigned char *nh = skb_network_header(skb); 462 sin->sin6_family = AF_INET6; 463 sin->sin6_flowinfo = 0; 464 sin->sin6_port = serr->port; 465 if (skb->protocol == htons(ETH_P_IPV6)) { 466 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 467 struct ipv6hdr, daddr); 468 sin->sin6_addr = ip6h->daddr; 469 if (np->sndflow) 470 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 471 sin->sin6_scope_id = 472 ipv6_iface_scope_id(&sin->sin6_addr, 473 IP6CB(skb)->iif); 474 } else { 475 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 476 &sin->sin6_addr); 477 sin->sin6_scope_id = 0; 478 } 479 *addr_len = sizeof(*sin); 480 } 481 482 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 483 sin = &errhdr.offender; 484 memset(sin, 0, sizeof(*sin)); 485 486 if (ip6_datagram_support_cmsg(skb, serr)) { 487 sin->sin6_family = AF_INET6; 488 if (np->rxopt.all) 489 ip6_datagram_recv_common_ctl(sk, msg, skb); 490 if (skb->protocol == htons(ETH_P_IPV6)) { 491 sin->sin6_addr = ipv6_hdr(skb)->saddr; 492 if (np->rxopt.all) 493 ip6_datagram_recv_specific_ctl(sk, msg, skb); 494 sin->sin6_scope_id = 495 ipv6_iface_scope_id(&sin->sin6_addr, 496 IP6CB(skb)->iif); 497 } else { 498 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 499 &sin->sin6_addr); 500 if (inet_sk(sk)->cmsg_flags) 501 ip_cmsg_recv(msg, skb); 502 } 503 } 504 505 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 506 507 /* Now we could try to dump offended packet options */ 508 509 msg->msg_flags |= MSG_ERRQUEUE; 510 err = copied; 511 512 out_free_skb: 513 kfree_skb(skb); 514 out: 515 return err; 516 } 517 EXPORT_SYMBOL_GPL(ipv6_recv_error); 518 519 /* 520 * Handle IPV6_RECVPATHMTU 521 */ 522 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 523 int *addr_len) 524 { 525 struct ipv6_pinfo *np = inet6_sk(sk); 526 struct sk_buff *skb; 527 struct ip6_mtuinfo mtu_info; 528 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 529 int err; 530 int copied; 531 532 err = -EAGAIN; 533 skb = xchg(&np->rxpmtu, NULL); 534 if (!skb) 535 goto out; 536 537 copied = skb->len; 538 if (copied > len) { 539 msg->msg_flags |= MSG_TRUNC; 540 copied = len; 541 } 542 err = skb_copy_datagram_msg(skb, 0, msg, copied); 543 if (err) 544 goto out_free_skb; 545 546 sock_recv_timestamp(msg, sk, skb); 547 548 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 549 550 if (sin) { 551 sin->sin6_family = AF_INET6; 552 sin->sin6_flowinfo = 0; 553 sin->sin6_port = 0; 554 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 555 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 556 *addr_len = sizeof(*sin); 557 } 558 559 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 560 561 err = copied; 562 563 out_free_skb: 564 kfree_skb(skb); 565 out: 566 return err; 567 } 568 569 570 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 571 struct sk_buff *skb) 572 { 573 struct ipv6_pinfo *np = inet6_sk(sk); 574 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 575 576 if (np->rxopt.bits.rxinfo) { 577 struct in6_pktinfo src_info; 578 579 if (is_ipv6) { 580 src_info.ipi6_ifindex = IP6CB(skb)->iif; 581 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 582 } else { 583 src_info.ipi6_ifindex = 584 PKTINFO_SKB_CB(skb)->ipi_ifindex; 585 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 586 &src_info.ipi6_addr); 587 } 588 589 if (src_info.ipi6_ifindex >= 0) 590 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 591 sizeof(src_info), &src_info); 592 } 593 } 594 595 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 596 struct sk_buff *skb) 597 { 598 struct ipv6_pinfo *np = inet6_sk(sk); 599 struct inet6_skb_parm *opt = IP6CB(skb); 600 unsigned char *nh = skb_network_header(skb); 601 602 if (np->rxopt.bits.rxhlim) { 603 int hlim = ipv6_hdr(skb)->hop_limit; 604 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 605 } 606 607 if (np->rxopt.bits.rxtclass) { 608 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 609 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 610 } 611 612 if (np->rxopt.bits.rxflow) { 613 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 614 if (flowinfo) 615 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 616 } 617 618 /* HbH is allowed only once */ 619 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 620 u8 *ptr = nh + sizeof(struct ipv6hdr); 621 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 622 } 623 624 if (opt->lastopt && 625 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 626 /* 627 * Silly enough, but we need to reparse in order to 628 * report extension headers (except for HbH) 629 * in order. 630 * 631 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 632 * (and WILL NOT be) defined because 633 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 634 */ 635 unsigned int off = sizeof(struct ipv6hdr); 636 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 637 638 while (off <= opt->lastopt) { 639 unsigned int len; 640 u8 *ptr = nh + off; 641 642 switch (nexthdr) { 643 case IPPROTO_DSTOPTS: 644 nexthdr = ptr[0]; 645 len = (ptr[1] + 1) << 3; 646 if (np->rxopt.bits.dstopts) 647 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 648 break; 649 case IPPROTO_ROUTING: 650 nexthdr = ptr[0]; 651 len = (ptr[1] + 1) << 3; 652 if (np->rxopt.bits.srcrt) 653 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 654 break; 655 case IPPROTO_AH: 656 nexthdr = ptr[0]; 657 len = (ptr[1] + 2) << 2; 658 break; 659 default: 660 nexthdr = ptr[0]; 661 len = (ptr[1] + 1) << 3; 662 break; 663 } 664 665 off += len; 666 } 667 } 668 669 /* socket options in old style */ 670 if (np->rxopt.bits.rxoinfo) { 671 struct in6_pktinfo src_info; 672 673 src_info.ipi6_ifindex = opt->iif; 674 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 675 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 676 } 677 if (np->rxopt.bits.rxohlim) { 678 int hlim = ipv6_hdr(skb)->hop_limit; 679 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 680 } 681 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 682 u8 *ptr = nh + sizeof(struct ipv6hdr); 683 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 684 } 685 if (np->rxopt.bits.odstopts && opt->dst0) { 686 u8 *ptr = nh + opt->dst0; 687 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 688 } 689 if (np->rxopt.bits.osrcrt && opt->srcrt) { 690 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 691 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 692 } 693 if (np->rxopt.bits.odstopts && opt->dst1) { 694 u8 *ptr = nh + opt->dst1; 695 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 696 } 697 if (np->rxopt.bits.rxorigdstaddr) { 698 struct sockaddr_in6 sin6; 699 __be16 *ports = (__be16 *) skb_transport_header(skb); 700 701 if (skb_transport_offset(skb) + 4 <= skb->len) { 702 /* All current transport protocols have the port numbers in the 703 * first four bytes of the transport header and this function is 704 * written with this assumption in mind. 705 */ 706 707 sin6.sin6_family = AF_INET6; 708 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 709 sin6.sin6_port = ports[1]; 710 sin6.sin6_flowinfo = 0; 711 sin6.sin6_scope_id = 712 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 713 opt->iif); 714 715 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 716 } 717 } 718 } 719 720 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 721 struct sk_buff *skb) 722 { 723 ip6_datagram_recv_common_ctl(sk, msg, skb); 724 ip6_datagram_recv_specific_ctl(sk, msg, skb); 725 } 726 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 727 728 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 729 struct msghdr *msg, struct flowi6 *fl6, 730 struct ipv6_txoptions *opt, 731 int *hlimit, int *tclass, int *dontfrag) 732 { 733 struct in6_pktinfo *src_info; 734 struct cmsghdr *cmsg; 735 struct ipv6_rt_hdr *rthdr; 736 struct ipv6_opt_hdr *hdr; 737 int len; 738 int err = 0; 739 740 for_each_cmsghdr(cmsg, msg) { 741 int addr_type; 742 743 if (!CMSG_OK(msg, cmsg)) { 744 err = -EINVAL; 745 goto exit_f; 746 } 747 748 if (cmsg->cmsg_level != SOL_IPV6) 749 continue; 750 751 switch (cmsg->cmsg_type) { 752 case IPV6_PKTINFO: 753 case IPV6_2292PKTINFO: 754 { 755 struct net_device *dev = NULL; 756 757 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 758 err = -EINVAL; 759 goto exit_f; 760 } 761 762 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 763 764 if (src_info->ipi6_ifindex) { 765 if (fl6->flowi6_oif && 766 src_info->ipi6_ifindex != fl6->flowi6_oif) 767 return -EINVAL; 768 fl6->flowi6_oif = src_info->ipi6_ifindex; 769 } 770 771 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 772 773 rcu_read_lock(); 774 if (fl6->flowi6_oif) { 775 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 776 if (!dev) { 777 rcu_read_unlock(); 778 return -ENODEV; 779 } 780 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 781 rcu_read_unlock(); 782 return -EINVAL; 783 } 784 785 if (addr_type != IPV6_ADDR_ANY) { 786 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 787 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 788 !ipv6_chk_addr(net, &src_info->ipi6_addr, 789 strict ? dev : NULL, 0) && 790 !ipv6_chk_acast_addr_src(net, dev, 791 &src_info->ipi6_addr)) 792 err = -EINVAL; 793 else 794 fl6->saddr = src_info->ipi6_addr; 795 } 796 797 rcu_read_unlock(); 798 799 if (err) 800 goto exit_f; 801 802 break; 803 } 804 805 case IPV6_FLOWINFO: 806 if (cmsg->cmsg_len < CMSG_LEN(4)) { 807 err = -EINVAL; 808 goto exit_f; 809 } 810 811 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 812 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 813 err = -EINVAL; 814 goto exit_f; 815 } 816 } 817 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 818 break; 819 820 case IPV6_2292HOPOPTS: 821 case IPV6_HOPOPTS: 822 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 823 err = -EINVAL; 824 goto exit_f; 825 } 826 827 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 828 len = ((hdr->hdrlen + 1) << 3); 829 if (cmsg->cmsg_len < CMSG_LEN(len)) { 830 err = -EINVAL; 831 goto exit_f; 832 } 833 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 834 err = -EPERM; 835 goto exit_f; 836 } 837 opt->opt_nflen += len; 838 opt->hopopt = hdr; 839 break; 840 841 case IPV6_2292DSTOPTS: 842 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 843 err = -EINVAL; 844 goto exit_f; 845 } 846 847 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 848 len = ((hdr->hdrlen + 1) << 3); 849 if (cmsg->cmsg_len < CMSG_LEN(len)) { 850 err = -EINVAL; 851 goto exit_f; 852 } 853 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 854 err = -EPERM; 855 goto exit_f; 856 } 857 if (opt->dst1opt) { 858 err = -EINVAL; 859 goto exit_f; 860 } 861 opt->opt_flen += len; 862 opt->dst1opt = hdr; 863 break; 864 865 case IPV6_DSTOPTS: 866 case IPV6_RTHDRDSTOPTS: 867 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 868 err = -EINVAL; 869 goto exit_f; 870 } 871 872 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 873 len = ((hdr->hdrlen + 1) << 3); 874 if (cmsg->cmsg_len < CMSG_LEN(len)) { 875 err = -EINVAL; 876 goto exit_f; 877 } 878 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 879 err = -EPERM; 880 goto exit_f; 881 } 882 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 883 opt->opt_flen += len; 884 opt->dst1opt = hdr; 885 } else { 886 opt->opt_nflen += len; 887 opt->dst0opt = hdr; 888 } 889 break; 890 891 case IPV6_2292RTHDR: 892 case IPV6_RTHDR: 893 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 894 err = -EINVAL; 895 goto exit_f; 896 } 897 898 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 899 900 switch (rthdr->type) { 901 #if IS_ENABLED(CONFIG_IPV6_MIP6) 902 case IPV6_SRCRT_TYPE_2: 903 if (rthdr->hdrlen != 2 || 904 rthdr->segments_left != 1) { 905 err = -EINVAL; 906 goto exit_f; 907 } 908 break; 909 #endif 910 default: 911 err = -EINVAL; 912 goto exit_f; 913 } 914 915 len = ((rthdr->hdrlen + 1) << 3); 916 917 if (cmsg->cmsg_len < CMSG_LEN(len)) { 918 err = -EINVAL; 919 goto exit_f; 920 } 921 922 /* segments left must also match */ 923 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 924 err = -EINVAL; 925 goto exit_f; 926 } 927 928 opt->opt_nflen += len; 929 opt->srcrt = rthdr; 930 931 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 932 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 933 934 opt->opt_nflen += dsthdrlen; 935 opt->dst0opt = opt->dst1opt; 936 opt->dst1opt = NULL; 937 opt->opt_flen -= dsthdrlen; 938 } 939 940 break; 941 942 case IPV6_2292HOPLIMIT: 943 case IPV6_HOPLIMIT: 944 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 945 err = -EINVAL; 946 goto exit_f; 947 } 948 949 *hlimit = *(int *)CMSG_DATA(cmsg); 950 if (*hlimit < -1 || *hlimit > 0xff) { 951 err = -EINVAL; 952 goto exit_f; 953 } 954 955 break; 956 957 case IPV6_TCLASS: 958 { 959 int tc; 960 961 err = -EINVAL; 962 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 963 goto exit_f; 964 965 tc = *(int *)CMSG_DATA(cmsg); 966 if (tc < -1 || tc > 0xff) 967 goto exit_f; 968 969 err = 0; 970 *tclass = tc; 971 972 break; 973 } 974 975 case IPV6_DONTFRAG: 976 { 977 int df; 978 979 err = -EINVAL; 980 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 981 goto exit_f; 982 983 df = *(int *)CMSG_DATA(cmsg); 984 if (df < 0 || df > 1) 985 goto exit_f; 986 987 err = 0; 988 *dontfrag = df; 989 990 break; 991 } 992 default: 993 net_dbg_ratelimited("invalid cmsg type: %d\n", 994 cmsg->cmsg_type); 995 err = -EINVAL; 996 goto exit_f; 997 } 998 } 999 1000 exit_f: 1001 return err; 1002 } 1003 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 1004 1005 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 1006 __u16 srcp, __u16 destp, int bucket) 1007 { 1008 const struct in6_addr *dest, *src; 1009 1010 dest = &sp->sk_v6_daddr; 1011 src = &sp->sk_v6_rcv_saddr; 1012 seq_printf(seq, 1013 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1014 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 1015 bucket, 1016 src->s6_addr32[0], src->s6_addr32[1], 1017 src->s6_addr32[2], src->s6_addr32[3], srcp, 1018 dest->s6_addr32[0], dest->s6_addr32[1], 1019 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1020 sp->sk_state, 1021 sk_wmem_alloc_get(sp), 1022 sk_rmem_alloc_get(sp), 1023 0, 0L, 0, 1024 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1025 0, 1026 sock_i_ino(sp), 1027 atomic_read(&sp->sk_refcnt), sp, 1028 atomic_read(&sp->sk_drops)); 1029 } 1030