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