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