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 <linux/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 fl6->flowi6_uid = sk->sk_uid; 58 59 if (!fl6->flowi6_oif) 60 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 61 62 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) 63 fl6->flowi6_oif = np->mcast_oif; 64 65 security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 66 } 67 68 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) 69 { 70 struct ip6_flowlabel *flowlabel = NULL; 71 struct in6_addr *final_p, final; 72 struct ipv6_txoptions *opt; 73 struct dst_entry *dst; 74 struct inet_sock *inet = inet_sk(sk); 75 struct ipv6_pinfo *np = inet6_sk(sk); 76 struct flowi6 fl6; 77 int err = 0; 78 79 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { 80 flowlabel = fl6_sock_lookup(sk, np->flow_label); 81 if (!flowlabel) 82 return -EINVAL; 83 } 84 ip6_datagram_flow_key_init(&fl6, sk); 85 86 rcu_read_lock(); 87 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); 88 final_p = fl6_update_dst(&fl6, opt, &final); 89 rcu_read_unlock(); 90 91 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 92 if (IS_ERR(dst)) { 93 err = PTR_ERR(dst); 94 goto out; 95 } 96 97 if (fix_sk_saddr) { 98 if (ipv6_addr_any(&np->saddr)) 99 np->saddr = fl6.saddr; 100 101 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 102 sk->sk_v6_rcv_saddr = fl6.saddr; 103 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 104 if (sk->sk_prot->rehash) 105 sk->sk_prot->rehash(sk); 106 } 107 } 108 109 ip6_dst_store(sk, dst, 110 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 111 &sk->sk_v6_daddr : NULL, 112 #ifdef CONFIG_IPV6_SUBTREES 113 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 114 &np->saddr : 115 #endif 116 NULL); 117 118 out: 119 fl6_sock_release(flowlabel); 120 return err; 121 } 122 123 void ip6_datagram_release_cb(struct sock *sk) 124 { 125 struct dst_entry *dst; 126 127 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) 128 return; 129 130 rcu_read_lock(); 131 dst = __sk_dst_get(sk); 132 if (!dst || !dst->obsolete || 133 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) { 134 rcu_read_unlock(); 135 return; 136 } 137 rcu_read_unlock(); 138 139 ip6_datagram_dst_update(sk, false); 140 } 141 EXPORT_SYMBOL_GPL(ip6_datagram_release_cb); 142 143 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, 144 int addr_len) 145 { 146 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 147 struct inet_sock *inet = inet_sk(sk); 148 struct ipv6_pinfo *np = inet6_sk(sk); 149 struct in6_addr *daddr; 150 int addr_type; 151 int err; 152 __be32 fl6_flowlabel = 0; 153 154 if (usin->sin6_family == AF_INET) { 155 if (__ipv6_only_sock(sk)) 156 return -EAFNOSUPPORT; 157 err = __ip4_datagram_connect(sk, uaddr, addr_len); 158 goto ipv4_connected; 159 } 160 161 if (addr_len < SIN6_LEN_RFC2133) 162 return -EINVAL; 163 164 if (usin->sin6_family != AF_INET6) 165 return -EAFNOSUPPORT; 166 167 if (np->sndflow) 168 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; 169 170 addr_type = ipv6_addr_type(&usin->sin6_addr); 171 172 if (addr_type == IPV6_ADDR_ANY) { 173 /* 174 * connect to self 175 */ 176 usin->sin6_addr.s6_addr[15] = 0x01; 177 } 178 179 daddr = &usin->sin6_addr; 180 181 if (addr_type == IPV6_ADDR_MAPPED) { 182 struct sockaddr_in sin; 183 184 if (__ipv6_only_sock(sk)) { 185 err = -ENETUNREACH; 186 goto out; 187 } 188 sin.sin_family = AF_INET; 189 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 190 sin.sin_port = usin->sin6_port; 191 192 err = __ip4_datagram_connect(sk, 193 (struct sockaddr *) &sin, 194 sizeof(sin)); 195 196 ipv4_connected: 197 if (err) 198 goto out; 199 200 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 201 202 if (ipv6_addr_any(&np->saddr) || 203 ipv6_mapped_addr_any(&np->saddr)) 204 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 205 206 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 207 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 208 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 209 &sk->sk_v6_rcv_saddr); 210 if (sk->sk_prot->rehash) 211 sk->sk_prot->rehash(sk); 212 } 213 214 goto out; 215 } 216 217 if (__ipv6_addr_needs_scope_id(addr_type)) { 218 if (addr_len >= sizeof(struct sockaddr_in6) && 219 usin->sin6_scope_id) { 220 if (sk->sk_bound_dev_if && 221 sk->sk_bound_dev_if != usin->sin6_scope_id) { 222 err = -EINVAL; 223 goto out; 224 } 225 sk->sk_bound_dev_if = usin->sin6_scope_id; 226 } 227 228 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 229 sk->sk_bound_dev_if = np->mcast_oif; 230 231 /* Connect to link-local address requires an interface */ 232 if (!sk->sk_bound_dev_if) { 233 err = -EINVAL; 234 goto out; 235 } 236 } 237 238 sk->sk_v6_daddr = *daddr; 239 np->flow_label = fl6_flowlabel; 240 241 inet->inet_dport = usin->sin6_port; 242 243 /* 244 * Check for a route to destination an obtain the 245 * destination cache for it. 246 */ 247 248 err = ip6_datagram_dst_update(sk, true); 249 if (err) 250 goto out; 251 252 sk->sk_state = TCP_ESTABLISHED; 253 sk_set_txhash(sk); 254 out: 255 return err; 256 } 257 EXPORT_SYMBOL_GPL(__ip6_datagram_connect); 258 259 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 260 { 261 int res; 262 263 lock_sock(sk); 264 res = __ip6_datagram_connect(sk, uaddr, addr_len); 265 release_sock(sk); 266 return res; 267 } 268 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 269 270 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 271 int addr_len) 272 { 273 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 274 if (sin6->sin6_family != AF_INET6) 275 return -EAFNOSUPPORT; 276 return ip6_datagram_connect(sk, uaddr, addr_len); 277 } 278 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 279 280 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 281 __be16 port, u32 info, u8 *payload) 282 { 283 struct ipv6_pinfo *np = inet6_sk(sk); 284 struct icmp6hdr *icmph = icmp6_hdr(skb); 285 struct sock_exterr_skb *serr; 286 287 if (!np->recverr) 288 return; 289 290 skb = skb_clone(skb, GFP_ATOMIC); 291 if (!skb) 292 return; 293 294 skb->protocol = htons(ETH_P_IPV6); 295 296 serr = SKB_EXT_ERR(skb); 297 serr->ee.ee_errno = err; 298 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 299 serr->ee.ee_type = icmph->icmp6_type; 300 serr->ee.ee_code = icmph->icmp6_code; 301 serr->ee.ee_pad = 0; 302 serr->ee.ee_info = info; 303 serr->ee.ee_data = 0; 304 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 305 skb_network_header(skb); 306 serr->port = port; 307 308 __skb_pull(skb, payload - skb->data); 309 skb_reset_transport_header(skb); 310 311 if (sock_queue_err_skb(sk, skb)) 312 kfree_skb(skb); 313 } 314 315 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 316 { 317 const struct ipv6_pinfo *np = inet6_sk(sk); 318 struct sock_exterr_skb *serr; 319 struct ipv6hdr *iph; 320 struct sk_buff *skb; 321 322 if (!np->recverr) 323 return; 324 325 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 326 if (!skb) 327 return; 328 329 skb->protocol = htons(ETH_P_IPV6); 330 331 skb_put(skb, sizeof(struct ipv6hdr)); 332 skb_reset_network_header(skb); 333 iph = ipv6_hdr(skb); 334 iph->daddr = fl6->daddr; 335 336 serr = SKB_EXT_ERR(skb); 337 serr->ee.ee_errno = err; 338 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 339 serr->ee.ee_type = 0; 340 serr->ee.ee_code = 0; 341 serr->ee.ee_pad = 0; 342 serr->ee.ee_info = info; 343 serr->ee.ee_data = 0; 344 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 345 serr->port = fl6->fl6_dport; 346 347 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 348 skb_reset_transport_header(skb); 349 350 if (sock_queue_err_skb(sk, skb)) 351 kfree_skb(skb); 352 } 353 354 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 355 { 356 struct ipv6_pinfo *np = inet6_sk(sk); 357 struct ipv6hdr *iph; 358 struct sk_buff *skb; 359 struct ip6_mtuinfo *mtu_info; 360 361 if (!np->rxopt.bits.rxpmtu) 362 return; 363 364 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 365 if (!skb) 366 return; 367 368 skb_put(skb, sizeof(struct ipv6hdr)); 369 skb_reset_network_header(skb); 370 iph = ipv6_hdr(skb); 371 iph->daddr = fl6->daddr; 372 373 mtu_info = IP6CBMTU(skb); 374 375 mtu_info->ip6m_mtu = mtu; 376 mtu_info->ip6m_addr.sin6_family = AF_INET6; 377 mtu_info->ip6m_addr.sin6_port = 0; 378 mtu_info->ip6m_addr.sin6_flowinfo = 0; 379 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 380 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 381 382 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 383 skb_reset_transport_header(skb); 384 385 skb = xchg(&np->rxpmtu, skb); 386 kfree_skb(skb); 387 } 388 389 /* For some errors we have valid addr_offset even with zero payload and 390 * zero port. Also, addr_offset should be supported if port is set. 391 */ 392 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 393 { 394 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 395 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 396 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 397 } 398 399 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 400 * 401 * At one point, excluding local errors was a quick test to identify icmp/icmp6 402 * errors. This is no longer true, but the test remained, so the v6 stack, 403 * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 404 * 405 * Timestamp code paths do not initialize the fields expected by cmsg: 406 * the PKTINFO fields in skb->cb[]. Fill those in here. 407 */ 408 static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 409 struct sock_exterr_skb *serr) 410 { 411 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 412 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 413 return true; 414 415 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 416 return false; 417 418 if (!skb->dev) 419 return false; 420 421 if (skb->protocol == htons(ETH_P_IPV6)) 422 IP6CB(skb)->iif = skb->dev->ifindex; 423 else 424 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 425 426 return true; 427 } 428 429 /* 430 * Handle MSG_ERRQUEUE 431 */ 432 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 433 { 434 struct ipv6_pinfo *np = inet6_sk(sk); 435 struct sock_exterr_skb *serr; 436 struct sk_buff *skb; 437 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 438 struct { 439 struct sock_extended_err ee; 440 struct sockaddr_in6 offender; 441 } errhdr; 442 int err; 443 int copied; 444 445 err = -EAGAIN; 446 skb = sock_dequeue_err_skb(sk); 447 if (!skb) 448 goto out; 449 450 copied = skb->len; 451 if (copied > len) { 452 msg->msg_flags |= MSG_TRUNC; 453 copied = len; 454 } 455 err = skb_copy_datagram_msg(skb, 0, msg, copied); 456 if (unlikely(err)) { 457 kfree_skb(skb); 458 return err; 459 } 460 sock_recv_timestamp(msg, sk, skb); 461 462 serr = SKB_EXT_ERR(skb); 463 464 if (sin && ipv6_datagram_support_addr(serr)) { 465 const unsigned char *nh = skb_network_header(skb); 466 sin->sin6_family = AF_INET6; 467 sin->sin6_flowinfo = 0; 468 sin->sin6_port = serr->port; 469 if (skb->protocol == htons(ETH_P_IPV6)) { 470 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 471 struct ipv6hdr, daddr); 472 sin->sin6_addr = ip6h->daddr; 473 if (np->sndflow) 474 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 475 sin->sin6_scope_id = 476 ipv6_iface_scope_id(&sin->sin6_addr, 477 IP6CB(skb)->iif); 478 } else { 479 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 480 &sin->sin6_addr); 481 sin->sin6_scope_id = 0; 482 } 483 *addr_len = sizeof(*sin); 484 } 485 486 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 487 sin = &errhdr.offender; 488 memset(sin, 0, sizeof(*sin)); 489 490 if (ip6_datagram_support_cmsg(skb, serr)) { 491 sin->sin6_family = AF_INET6; 492 if (np->rxopt.all) 493 ip6_datagram_recv_common_ctl(sk, msg, skb); 494 if (skb->protocol == htons(ETH_P_IPV6)) { 495 sin->sin6_addr = ipv6_hdr(skb)->saddr; 496 if (np->rxopt.all) 497 ip6_datagram_recv_specific_ctl(sk, msg, skb); 498 sin->sin6_scope_id = 499 ipv6_iface_scope_id(&sin->sin6_addr, 500 IP6CB(skb)->iif); 501 } else { 502 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 503 &sin->sin6_addr); 504 if (inet_sk(sk)->cmsg_flags) 505 ip_cmsg_recv(msg, skb); 506 } 507 } 508 509 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 510 511 /* Now we could try to dump offended packet options */ 512 513 msg->msg_flags |= MSG_ERRQUEUE; 514 err = copied; 515 516 consume_skb(skb); 517 out: 518 return err; 519 } 520 EXPORT_SYMBOL_GPL(ipv6_recv_error); 521 522 /* 523 * Handle IPV6_RECVPATHMTU 524 */ 525 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 526 int *addr_len) 527 { 528 struct ipv6_pinfo *np = inet6_sk(sk); 529 struct sk_buff *skb; 530 struct ip6_mtuinfo mtu_info; 531 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 532 int err; 533 int copied; 534 535 err = -EAGAIN; 536 skb = xchg(&np->rxpmtu, NULL); 537 if (!skb) 538 goto out; 539 540 copied = skb->len; 541 if (copied > len) { 542 msg->msg_flags |= MSG_TRUNC; 543 copied = len; 544 } 545 err = skb_copy_datagram_msg(skb, 0, msg, copied); 546 if (err) 547 goto out_free_skb; 548 549 sock_recv_timestamp(msg, sk, skb); 550 551 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 552 553 if (sin) { 554 sin->sin6_family = AF_INET6; 555 sin->sin6_flowinfo = 0; 556 sin->sin6_port = 0; 557 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 558 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 559 *addr_len = sizeof(*sin); 560 } 561 562 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 563 564 err = copied; 565 566 out_free_skb: 567 kfree_skb(skb); 568 out: 569 return err; 570 } 571 572 573 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 574 struct sk_buff *skb) 575 { 576 struct ipv6_pinfo *np = inet6_sk(sk); 577 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 578 579 if (np->rxopt.bits.rxinfo) { 580 struct in6_pktinfo src_info; 581 582 if (is_ipv6) { 583 src_info.ipi6_ifindex = IP6CB(skb)->iif; 584 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 585 } else { 586 src_info.ipi6_ifindex = 587 PKTINFO_SKB_CB(skb)->ipi_ifindex; 588 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 589 &src_info.ipi6_addr); 590 } 591 592 if (src_info.ipi6_ifindex >= 0) 593 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 594 sizeof(src_info), &src_info); 595 } 596 } 597 598 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 599 struct sk_buff *skb) 600 { 601 struct ipv6_pinfo *np = inet6_sk(sk); 602 struct inet6_skb_parm *opt = IP6CB(skb); 603 unsigned char *nh = skb_network_header(skb); 604 605 if (np->rxopt.bits.rxhlim) { 606 int hlim = ipv6_hdr(skb)->hop_limit; 607 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 608 } 609 610 if (np->rxopt.bits.rxtclass) { 611 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 612 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 613 } 614 615 if (np->rxopt.bits.rxflow) { 616 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 617 if (flowinfo) 618 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 619 } 620 621 /* HbH is allowed only once */ 622 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 623 u8 *ptr = nh + sizeof(struct ipv6hdr); 624 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 625 } 626 627 if (opt->lastopt && 628 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 629 /* 630 * Silly enough, but we need to reparse in order to 631 * report extension headers (except for HbH) 632 * in order. 633 * 634 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 635 * (and WILL NOT be) defined because 636 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 637 */ 638 unsigned int off = sizeof(struct ipv6hdr); 639 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 640 641 while (off <= opt->lastopt) { 642 unsigned int len; 643 u8 *ptr = nh + off; 644 645 switch (nexthdr) { 646 case IPPROTO_DSTOPTS: 647 nexthdr = ptr[0]; 648 len = (ptr[1] + 1) << 3; 649 if (np->rxopt.bits.dstopts) 650 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 651 break; 652 case IPPROTO_ROUTING: 653 nexthdr = ptr[0]; 654 len = (ptr[1] + 1) << 3; 655 if (np->rxopt.bits.srcrt) 656 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 657 break; 658 case IPPROTO_AH: 659 nexthdr = ptr[0]; 660 len = (ptr[1] + 2) << 2; 661 break; 662 default: 663 nexthdr = ptr[0]; 664 len = (ptr[1] + 1) << 3; 665 break; 666 } 667 668 off += len; 669 } 670 } 671 672 /* socket options in old style */ 673 if (np->rxopt.bits.rxoinfo) { 674 struct in6_pktinfo src_info; 675 676 src_info.ipi6_ifindex = opt->iif; 677 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 678 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 679 } 680 if (np->rxopt.bits.rxohlim) { 681 int hlim = ipv6_hdr(skb)->hop_limit; 682 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 683 } 684 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 685 u8 *ptr = nh + sizeof(struct ipv6hdr); 686 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 687 } 688 if (np->rxopt.bits.odstopts && opt->dst0) { 689 u8 *ptr = nh + opt->dst0; 690 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 691 } 692 if (np->rxopt.bits.osrcrt && opt->srcrt) { 693 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 694 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 695 } 696 if (np->rxopt.bits.odstopts && opt->dst1) { 697 u8 *ptr = nh + opt->dst1; 698 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 699 } 700 if (np->rxopt.bits.rxorigdstaddr) { 701 struct sockaddr_in6 sin6; 702 __be16 *ports = (__be16 *) skb_transport_header(skb); 703 704 if (skb_transport_offset(skb) + 4 <= (int)skb->len) { 705 /* All current transport protocols have the port numbers in the 706 * first four bytes of the transport header and this function is 707 * written with this assumption in mind. 708 */ 709 710 sin6.sin6_family = AF_INET6; 711 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 712 sin6.sin6_port = ports[1]; 713 sin6.sin6_flowinfo = 0; 714 sin6.sin6_scope_id = 715 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 716 opt->iif); 717 718 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 719 } 720 } 721 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) { 722 int val = opt->frag_max_size; 723 724 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val); 725 } 726 } 727 728 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 729 struct sk_buff *skb) 730 { 731 ip6_datagram_recv_common_ctl(sk, msg, skb); 732 ip6_datagram_recv_specific_ctl(sk, msg, skb); 733 } 734 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 735 736 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 737 struct msghdr *msg, struct flowi6 *fl6, 738 struct ipcm6_cookie *ipc6, struct sockcm_cookie *sockc) 739 { 740 struct in6_pktinfo *src_info; 741 struct cmsghdr *cmsg; 742 struct ipv6_rt_hdr *rthdr; 743 struct ipv6_opt_hdr *hdr; 744 struct ipv6_txoptions *opt = ipc6->opt; 745 int len; 746 int err = 0; 747 748 for_each_cmsghdr(cmsg, msg) { 749 int addr_type; 750 751 if (!CMSG_OK(msg, cmsg)) { 752 err = -EINVAL; 753 goto exit_f; 754 } 755 756 if (cmsg->cmsg_level == SOL_SOCKET) { 757 err = __sock_cmsg_send(sk, msg, cmsg, sockc); 758 if (err) 759 return err; 760 continue; 761 } 762 763 if (cmsg->cmsg_level != SOL_IPV6) 764 continue; 765 766 switch (cmsg->cmsg_type) { 767 case IPV6_PKTINFO: 768 case IPV6_2292PKTINFO: 769 { 770 struct net_device *dev = NULL; 771 772 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 773 err = -EINVAL; 774 goto exit_f; 775 } 776 777 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 778 779 if (src_info->ipi6_ifindex) { 780 if (fl6->flowi6_oif && 781 src_info->ipi6_ifindex != fl6->flowi6_oif) 782 return -EINVAL; 783 fl6->flowi6_oif = src_info->ipi6_ifindex; 784 } 785 786 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 787 788 rcu_read_lock(); 789 if (fl6->flowi6_oif) { 790 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 791 if (!dev) { 792 rcu_read_unlock(); 793 return -ENODEV; 794 } 795 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 796 rcu_read_unlock(); 797 return -EINVAL; 798 } 799 800 if (addr_type != IPV6_ADDR_ANY) { 801 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 802 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 803 !ipv6_chk_addr(net, &src_info->ipi6_addr, 804 strict ? dev : NULL, 0) && 805 !ipv6_chk_acast_addr_src(net, dev, 806 &src_info->ipi6_addr)) 807 err = -EINVAL; 808 else 809 fl6->saddr = src_info->ipi6_addr; 810 } 811 812 rcu_read_unlock(); 813 814 if (err) 815 goto exit_f; 816 817 break; 818 } 819 820 case IPV6_FLOWINFO: 821 if (cmsg->cmsg_len < CMSG_LEN(4)) { 822 err = -EINVAL; 823 goto exit_f; 824 } 825 826 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 827 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 828 err = -EINVAL; 829 goto exit_f; 830 } 831 } 832 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 833 break; 834 835 case IPV6_2292HOPOPTS: 836 case IPV6_HOPOPTS: 837 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 838 err = -EINVAL; 839 goto exit_f; 840 } 841 842 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 843 len = ((hdr->hdrlen + 1) << 3); 844 if (cmsg->cmsg_len < CMSG_LEN(len)) { 845 err = -EINVAL; 846 goto exit_f; 847 } 848 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 849 err = -EPERM; 850 goto exit_f; 851 } 852 opt->opt_nflen += len; 853 opt->hopopt = hdr; 854 break; 855 856 case IPV6_2292DSTOPTS: 857 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 858 err = -EINVAL; 859 goto exit_f; 860 } 861 862 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 863 len = ((hdr->hdrlen + 1) << 3); 864 if (cmsg->cmsg_len < CMSG_LEN(len)) { 865 err = -EINVAL; 866 goto exit_f; 867 } 868 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 869 err = -EPERM; 870 goto exit_f; 871 } 872 if (opt->dst1opt) { 873 err = -EINVAL; 874 goto exit_f; 875 } 876 opt->opt_flen += len; 877 opt->dst1opt = hdr; 878 break; 879 880 case IPV6_DSTOPTS: 881 case IPV6_RTHDRDSTOPTS: 882 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 883 err = -EINVAL; 884 goto exit_f; 885 } 886 887 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 888 len = ((hdr->hdrlen + 1) << 3); 889 if (cmsg->cmsg_len < CMSG_LEN(len)) { 890 err = -EINVAL; 891 goto exit_f; 892 } 893 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 894 err = -EPERM; 895 goto exit_f; 896 } 897 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 898 opt->opt_flen += len; 899 opt->dst1opt = hdr; 900 } else { 901 opt->opt_nflen += len; 902 opt->dst0opt = hdr; 903 } 904 break; 905 906 case IPV6_2292RTHDR: 907 case IPV6_RTHDR: 908 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 909 err = -EINVAL; 910 goto exit_f; 911 } 912 913 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 914 915 switch (rthdr->type) { 916 #if IS_ENABLED(CONFIG_IPV6_MIP6) 917 case IPV6_SRCRT_TYPE_2: 918 if (rthdr->hdrlen != 2 || 919 rthdr->segments_left != 1) { 920 err = -EINVAL; 921 goto exit_f; 922 } 923 break; 924 #endif 925 default: 926 err = -EINVAL; 927 goto exit_f; 928 } 929 930 len = ((rthdr->hdrlen + 1) << 3); 931 932 if (cmsg->cmsg_len < CMSG_LEN(len)) { 933 err = -EINVAL; 934 goto exit_f; 935 } 936 937 /* segments left must also match */ 938 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 939 err = -EINVAL; 940 goto exit_f; 941 } 942 943 opt->opt_nflen += len; 944 opt->srcrt = rthdr; 945 946 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 947 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 948 949 opt->opt_nflen += dsthdrlen; 950 opt->dst0opt = opt->dst1opt; 951 opt->dst1opt = NULL; 952 opt->opt_flen -= dsthdrlen; 953 } 954 955 break; 956 957 case IPV6_2292HOPLIMIT: 958 case IPV6_HOPLIMIT: 959 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 960 err = -EINVAL; 961 goto exit_f; 962 } 963 964 ipc6->hlimit = *(int *)CMSG_DATA(cmsg); 965 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) { 966 err = -EINVAL; 967 goto exit_f; 968 } 969 970 break; 971 972 case IPV6_TCLASS: 973 { 974 int tc; 975 976 err = -EINVAL; 977 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 978 goto exit_f; 979 980 tc = *(int *)CMSG_DATA(cmsg); 981 if (tc < -1 || tc > 0xff) 982 goto exit_f; 983 984 err = 0; 985 ipc6->tclass = tc; 986 987 break; 988 } 989 990 case IPV6_DONTFRAG: 991 { 992 int df; 993 994 err = -EINVAL; 995 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 996 goto exit_f; 997 998 df = *(int *)CMSG_DATA(cmsg); 999 if (df < 0 || df > 1) 1000 goto exit_f; 1001 1002 err = 0; 1003 ipc6->dontfrag = df; 1004 1005 break; 1006 } 1007 default: 1008 net_dbg_ratelimited("invalid cmsg type: %d\n", 1009 cmsg->cmsg_type); 1010 err = -EINVAL; 1011 goto exit_f; 1012 } 1013 } 1014 1015 exit_f: 1016 return err; 1017 } 1018 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 1019 1020 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 1021 __u16 srcp, __u16 destp, int bucket) 1022 { 1023 const struct in6_addr *dest, *src; 1024 1025 dest = &sp->sk_v6_daddr; 1026 src = &sp->sk_v6_rcv_saddr; 1027 seq_printf(seq, 1028 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1029 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 1030 bucket, 1031 src->s6_addr32[0], src->s6_addr32[1], 1032 src->s6_addr32[2], src->s6_addr32[3], srcp, 1033 dest->s6_addr32[0], dest->s6_addr32[1], 1034 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1035 sp->sk_state, 1036 sk_wmem_alloc_get(sp), 1037 sk_rmem_alloc_get(sp), 1038 0, 0L, 0, 1039 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1040 0, 1041 sock_i_ino(sp), 1042 atomic_read(&sp->sk_refcnt), sp, 1043 atomic_read(&sp->sk_drops)); 1044 } 1045