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 if (ipv6_addr_any(&usin->sin6_addr)) { 171 /* 172 * connect to self 173 */ 174 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) 175 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 176 &usin->sin6_addr); 177 else 178 usin->sin6_addr = in6addr_loopback; 179 } 180 181 addr_type = ipv6_addr_type(&usin->sin6_addr); 182 183 daddr = &usin->sin6_addr; 184 185 if (addr_type & IPV6_ADDR_MAPPED) { 186 struct sockaddr_in sin; 187 188 if (__ipv6_only_sock(sk)) { 189 err = -ENETUNREACH; 190 goto out; 191 } 192 sin.sin_family = AF_INET; 193 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 194 sin.sin_port = usin->sin6_port; 195 196 err = __ip4_datagram_connect(sk, 197 (struct sockaddr *) &sin, 198 sizeof(sin)); 199 200 ipv4_connected: 201 if (err) 202 goto out; 203 204 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 205 206 if (ipv6_addr_any(&np->saddr) || 207 ipv6_mapped_addr_any(&np->saddr)) 208 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 209 210 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 211 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 212 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 213 &sk->sk_v6_rcv_saddr); 214 if (sk->sk_prot->rehash) 215 sk->sk_prot->rehash(sk); 216 } 217 218 goto out; 219 } 220 221 if (__ipv6_addr_needs_scope_id(addr_type)) { 222 if (addr_len >= sizeof(struct sockaddr_in6) && 223 usin->sin6_scope_id) { 224 if (sk->sk_bound_dev_if && 225 sk->sk_bound_dev_if != usin->sin6_scope_id) { 226 err = -EINVAL; 227 goto out; 228 } 229 sk->sk_bound_dev_if = usin->sin6_scope_id; 230 } 231 232 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 233 sk->sk_bound_dev_if = np->mcast_oif; 234 235 /* Connect to link-local address requires an interface */ 236 if (!sk->sk_bound_dev_if) { 237 err = -EINVAL; 238 goto out; 239 } 240 } 241 242 sk->sk_v6_daddr = *daddr; 243 np->flow_label = fl6_flowlabel; 244 245 inet->inet_dport = usin->sin6_port; 246 247 /* 248 * Check for a route to destination an obtain the 249 * destination cache for it. 250 */ 251 252 err = ip6_datagram_dst_update(sk, true); 253 if (err) 254 goto out; 255 256 sk->sk_state = TCP_ESTABLISHED; 257 sk_set_txhash(sk); 258 out: 259 return err; 260 } 261 EXPORT_SYMBOL_GPL(__ip6_datagram_connect); 262 263 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 264 { 265 int res; 266 267 lock_sock(sk); 268 res = __ip6_datagram_connect(sk, uaddr, addr_len); 269 release_sock(sk); 270 return res; 271 } 272 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 273 274 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 275 int addr_len) 276 { 277 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 278 if (sin6->sin6_family != AF_INET6) 279 return -EAFNOSUPPORT; 280 return ip6_datagram_connect(sk, uaddr, addr_len); 281 } 282 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 283 284 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 285 __be16 port, u32 info, u8 *payload) 286 { 287 struct ipv6_pinfo *np = inet6_sk(sk); 288 struct icmp6hdr *icmph = icmp6_hdr(skb); 289 struct sock_exterr_skb *serr; 290 291 if (!np->recverr) 292 return; 293 294 skb = skb_clone(skb, GFP_ATOMIC); 295 if (!skb) 296 return; 297 298 skb->protocol = htons(ETH_P_IPV6); 299 300 serr = SKB_EXT_ERR(skb); 301 serr->ee.ee_errno = err; 302 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 303 serr->ee.ee_type = icmph->icmp6_type; 304 serr->ee.ee_code = icmph->icmp6_code; 305 serr->ee.ee_pad = 0; 306 serr->ee.ee_info = info; 307 serr->ee.ee_data = 0; 308 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 309 skb_network_header(skb); 310 serr->port = port; 311 312 __skb_pull(skb, payload - skb->data); 313 skb_reset_transport_header(skb); 314 315 if (sock_queue_err_skb(sk, skb)) 316 kfree_skb(skb); 317 } 318 319 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 320 { 321 const struct ipv6_pinfo *np = inet6_sk(sk); 322 struct sock_exterr_skb *serr; 323 struct ipv6hdr *iph; 324 struct sk_buff *skb; 325 326 if (!np->recverr) 327 return; 328 329 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 330 if (!skb) 331 return; 332 333 skb->protocol = htons(ETH_P_IPV6); 334 335 skb_put(skb, sizeof(struct ipv6hdr)); 336 skb_reset_network_header(skb); 337 iph = ipv6_hdr(skb); 338 iph->daddr = fl6->daddr; 339 340 serr = SKB_EXT_ERR(skb); 341 serr->ee.ee_errno = err; 342 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 343 serr->ee.ee_type = 0; 344 serr->ee.ee_code = 0; 345 serr->ee.ee_pad = 0; 346 serr->ee.ee_info = info; 347 serr->ee.ee_data = 0; 348 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 349 serr->port = fl6->fl6_dport; 350 351 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 352 skb_reset_transport_header(skb); 353 354 if (sock_queue_err_skb(sk, skb)) 355 kfree_skb(skb); 356 } 357 358 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 359 { 360 struct ipv6_pinfo *np = inet6_sk(sk); 361 struct ipv6hdr *iph; 362 struct sk_buff *skb; 363 struct ip6_mtuinfo *mtu_info; 364 365 if (!np->rxopt.bits.rxpmtu) 366 return; 367 368 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 369 if (!skb) 370 return; 371 372 skb_put(skb, sizeof(struct ipv6hdr)); 373 skb_reset_network_header(skb); 374 iph = ipv6_hdr(skb); 375 iph->daddr = fl6->daddr; 376 377 mtu_info = IP6CBMTU(skb); 378 379 mtu_info->ip6m_mtu = mtu; 380 mtu_info->ip6m_addr.sin6_family = AF_INET6; 381 mtu_info->ip6m_addr.sin6_port = 0; 382 mtu_info->ip6m_addr.sin6_flowinfo = 0; 383 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 384 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 385 386 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 387 skb_reset_transport_header(skb); 388 389 skb = xchg(&np->rxpmtu, skb); 390 kfree_skb(skb); 391 } 392 393 /* For some errors we have valid addr_offset even with zero payload and 394 * zero port. Also, addr_offset should be supported if port is set. 395 */ 396 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 397 { 398 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 399 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 400 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 401 } 402 403 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 404 * 405 * At one point, excluding local errors was a quick test to identify icmp/icmp6 406 * errors. This is no longer true, but the test remained, so the v6 stack, 407 * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 408 */ 409 static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 410 struct sock_exterr_skb *serr) 411 { 412 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 413 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 414 return true; 415 416 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 417 return false; 418 419 if (!IP6CB(skb)->iif) 420 return false; 421 422 return true; 423 } 424 425 /* 426 * Handle MSG_ERRQUEUE 427 */ 428 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 429 { 430 struct ipv6_pinfo *np = inet6_sk(sk); 431 struct sock_exterr_skb *serr; 432 struct sk_buff *skb; 433 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 434 struct { 435 struct sock_extended_err ee; 436 struct sockaddr_in6 offender; 437 } errhdr; 438 int err; 439 int copied; 440 441 err = -EAGAIN; 442 skb = sock_dequeue_err_skb(sk); 443 if (!skb) 444 goto out; 445 446 copied = skb->len; 447 if (copied > len) { 448 msg->msg_flags |= MSG_TRUNC; 449 copied = len; 450 } 451 err = skb_copy_datagram_msg(skb, 0, msg, copied); 452 if (unlikely(err)) { 453 kfree_skb(skb); 454 return err; 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 consume_skb(skb); 513 out: 514 return err; 515 } 516 EXPORT_SYMBOL_GPL(ipv6_recv_error); 517 518 /* 519 * Handle IPV6_RECVPATHMTU 520 */ 521 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 522 int *addr_len) 523 { 524 struct ipv6_pinfo *np = inet6_sk(sk); 525 struct sk_buff *skb; 526 struct ip6_mtuinfo mtu_info; 527 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 528 int err; 529 int copied; 530 531 err = -EAGAIN; 532 skb = xchg(&np->rxpmtu, NULL); 533 if (!skb) 534 goto out; 535 536 copied = skb->len; 537 if (copied > len) { 538 msg->msg_flags |= MSG_TRUNC; 539 copied = len; 540 } 541 err = skb_copy_datagram_msg(skb, 0, msg, copied); 542 if (err) 543 goto out_free_skb; 544 545 sock_recv_timestamp(msg, sk, skb); 546 547 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 548 549 if (sin) { 550 sin->sin6_family = AF_INET6; 551 sin->sin6_flowinfo = 0; 552 sin->sin6_port = 0; 553 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 554 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 555 *addr_len = sizeof(*sin); 556 } 557 558 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 559 560 err = copied; 561 562 out_free_skb: 563 kfree_skb(skb); 564 out: 565 return err; 566 } 567 568 569 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 570 struct sk_buff *skb) 571 { 572 struct ipv6_pinfo *np = inet6_sk(sk); 573 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 574 575 if (np->rxopt.bits.rxinfo) { 576 struct in6_pktinfo src_info; 577 578 if (is_ipv6) { 579 src_info.ipi6_ifindex = IP6CB(skb)->iif; 580 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 581 } else { 582 src_info.ipi6_ifindex = 583 PKTINFO_SKB_CB(skb)->ipi_ifindex; 584 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 585 &src_info.ipi6_addr); 586 } 587 588 if (src_info.ipi6_ifindex >= 0) 589 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 590 sizeof(src_info), &src_info); 591 } 592 } 593 594 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 595 struct sk_buff *skb) 596 { 597 struct ipv6_pinfo *np = inet6_sk(sk); 598 struct inet6_skb_parm *opt = IP6CB(skb); 599 unsigned char *nh = skb_network_header(skb); 600 601 if (np->rxopt.bits.rxhlim) { 602 int hlim = ipv6_hdr(skb)->hop_limit; 603 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 604 } 605 606 if (np->rxopt.bits.rxtclass) { 607 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 608 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 609 } 610 611 if (np->rxopt.bits.rxflow) { 612 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 613 if (flowinfo) 614 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 615 } 616 617 /* HbH is allowed only once */ 618 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 619 u8 *ptr = nh + sizeof(struct ipv6hdr); 620 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 621 } 622 623 if (opt->lastopt && 624 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 625 /* 626 * Silly enough, but we need to reparse in order to 627 * report extension headers (except for HbH) 628 * in order. 629 * 630 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 631 * (and WILL NOT be) defined because 632 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 633 */ 634 unsigned int off = sizeof(struct ipv6hdr); 635 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 636 637 while (off <= opt->lastopt) { 638 unsigned int len; 639 u8 *ptr = nh + off; 640 641 switch (nexthdr) { 642 case IPPROTO_DSTOPTS: 643 nexthdr = ptr[0]; 644 len = (ptr[1] + 1) << 3; 645 if (np->rxopt.bits.dstopts) 646 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 647 break; 648 case IPPROTO_ROUTING: 649 nexthdr = ptr[0]; 650 len = (ptr[1] + 1) << 3; 651 if (np->rxopt.bits.srcrt) 652 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 653 break; 654 case IPPROTO_AH: 655 nexthdr = ptr[0]; 656 len = (ptr[1] + 2) << 2; 657 break; 658 default: 659 nexthdr = ptr[0]; 660 len = (ptr[1] + 1) << 3; 661 break; 662 } 663 664 off += len; 665 } 666 } 667 668 /* socket options in old style */ 669 if (np->rxopt.bits.rxoinfo) { 670 struct in6_pktinfo src_info; 671 672 src_info.ipi6_ifindex = opt->iif; 673 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 674 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 675 } 676 if (np->rxopt.bits.rxohlim) { 677 int hlim = ipv6_hdr(skb)->hop_limit; 678 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 679 } 680 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 681 u8 *ptr = nh + sizeof(struct ipv6hdr); 682 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 683 } 684 if (np->rxopt.bits.odstopts && opt->dst0) { 685 u8 *ptr = nh + opt->dst0; 686 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 687 } 688 if (np->rxopt.bits.osrcrt && opt->srcrt) { 689 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 690 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 691 } 692 if (np->rxopt.bits.odstopts && opt->dst1) { 693 u8 *ptr = nh + opt->dst1; 694 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 695 } 696 if (np->rxopt.bits.rxorigdstaddr) { 697 struct sockaddr_in6 sin6; 698 __be16 *ports = (__be16 *) skb_transport_header(skb); 699 700 if (skb_transport_offset(skb) + 4 <= (int)skb->len) { 701 /* All current transport protocols have the port numbers in the 702 * first four bytes of the transport header and this function is 703 * written with this assumption in mind. 704 */ 705 706 sin6.sin6_family = AF_INET6; 707 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 708 sin6.sin6_port = ports[1]; 709 sin6.sin6_flowinfo = 0; 710 sin6.sin6_scope_id = 711 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 712 opt->iif); 713 714 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 715 } 716 } 717 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) { 718 int val = opt->frag_max_size; 719 720 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val); 721 } 722 } 723 724 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 725 struct sk_buff *skb) 726 { 727 ip6_datagram_recv_common_ctl(sk, msg, skb); 728 ip6_datagram_recv_specific_ctl(sk, msg, skb); 729 } 730 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 731 732 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 733 struct msghdr *msg, struct flowi6 *fl6, 734 struct ipcm6_cookie *ipc6, struct sockcm_cookie *sockc) 735 { 736 struct in6_pktinfo *src_info; 737 struct cmsghdr *cmsg; 738 struct ipv6_rt_hdr *rthdr; 739 struct ipv6_opt_hdr *hdr; 740 struct ipv6_txoptions *opt = ipc6->opt; 741 int len; 742 int err = 0; 743 744 for_each_cmsghdr(cmsg, msg) { 745 int addr_type; 746 747 if (!CMSG_OK(msg, cmsg)) { 748 err = -EINVAL; 749 goto exit_f; 750 } 751 752 if (cmsg->cmsg_level == SOL_SOCKET) { 753 err = __sock_cmsg_send(sk, msg, cmsg, sockc); 754 if (err) 755 return err; 756 continue; 757 } 758 759 if (cmsg->cmsg_level != SOL_IPV6) 760 continue; 761 762 switch (cmsg->cmsg_type) { 763 case IPV6_PKTINFO: 764 case IPV6_2292PKTINFO: 765 { 766 struct net_device *dev = NULL; 767 768 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 769 err = -EINVAL; 770 goto exit_f; 771 } 772 773 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 774 775 if (src_info->ipi6_ifindex) { 776 if (fl6->flowi6_oif && 777 src_info->ipi6_ifindex != fl6->flowi6_oif) 778 return -EINVAL; 779 fl6->flowi6_oif = src_info->ipi6_ifindex; 780 } 781 782 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 783 784 rcu_read_lock(); 785 if (fl6->flowi6_oif) { 786 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 787 if (!dev) { 788 rcu_read_unlock(); 789 return -ENODEV; 790 } 791 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 792 rcu_read_unlock(); 793 return -EINVAL; 794 } 795 796 if (addr_type != IPV6_ADDR_ANY) { 797 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 798 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 799 !ipv6_chk_addr(net, &src_info->ipi6_addr, 800 strict ? dev : NULL, 0) && 801 !ipv6_chk_acast_addr_src(net, dev, 802 &src_info->ipi6_addr)) 803 err = -EINVAL; 804 else 805 fl6->saddr = src_info->ipi6_addr; 806 } 807 808 rcu_read_unlock(); 809 810 if (err) 811 goto exit_f; 812 813 break; 814 } 815 816 case IPV6_FLOWINFO: 817 if (cmsg->cmsg_len < CMSG_LEN(4)) { 818 err = -EINVAL; 819 goto exit_f; 820 } 821 822 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 823 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 824 err = -EINVAL; 825 goto exit_f; 826 } 827 } 828 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 829 break; 830 831 case IPV6_2292HOPOPTS: 832 case IPV6_HOPOPTS: 833 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 834 err = -EINVAL; 835 goto exit_f; 836 } 837 838 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 839 len = ((hdr->hdrlen + 1) << 3); 840 if (cmsg->cmsg_len < CMSG_LEN(len)) { 841 err = -EINVAL; 842 goto exit_f; 843 } 844 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 845 err = -EPERM; 846 goto exit_f; 847 } 848 opt->opt_nflen += len; 849 opt->hopopt = hdr; 850 break; 851 852 case IPV6_2292DSTOPTS: 853 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 854 err = -EINVAL; 855 goto exit_f; 856 } 857 858 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 859 len = ((hdr->hdrlen + 1) << 3); 860 if (cmsg->cmsg_len < CMSG_LEN(len)) { 861 err = -EINVAL; 862 goto exit_f; 863 } 864 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 865 err = -EPERM; 866 goto exit_f; 867 } 868 if (opt->dst1opt) { 869 err = -EINVAL; 870 goto exit_f; 871 } 872 opt->opt_flen += len; 873 opt->dst1opt = hdr; 874 break; 875 876 case IPV6_DSTOPTS: 877 case IPV6_RTHDRDSTOPTS: 878 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 879 err = -EINVAL; 880 goto exit_f; 881 } 882 883 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 884 len = ((hdr->hdrlen + 1) << 3); 885 if (cmsg->cmsg_len < CMSG_LEN(len)) { 886 err = -EINVAL; 887 goto exit_f; 888 } 889 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 890 err = -EPERM; 891 goto exit_f; 892 } 893 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 894 opt->opt_flen += len; 895 opt->dst1opt = hdr; 896 } else { 897 opt->opt_nflen += len; 898 opt->dst0opt = hdr; 899 } 900 break; 901 902 case IPV6_2292RTHDR: 903 case IPV6_RTHDR: 904 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 905 err = -EINVAL; 906 goto exit_f; 907 } 908 909 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 910 911 switch (rthdr->type) { 912 #if IS_ENABLED(CONFIG_IPV6_MIP6) 913 case IPV6_SRCRT_TYPE_2: 914 if (rthdr->hdrlen != 2 || 915 rthdr->segments_left != 1) { 916 err = -EINVAL; 917 goto exit_f; 918 } 919 break; 920 #endif 921 default: 922 err = -EINVAL; 923 goto exit_f; 924 } 925 926 len = ((rthdr->hdrlen + 1) << 3); 927 928 if (cmsg->cmsg_len < CMSG_LEN(len)) { 929 err = -EINVAL; 930 goto exit_f; 931 } 932 933 /* segments left must also match */ 934 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 935 err = -EINVAL; 936 goto exit_f; 937 } 938 939 opt->opt_nflen += len; 940 opt->srcrt = rthdr; 941 942 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 943 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 944 945 opt->opt_nflen += dsthdrlen; 946 opt->dst0opt = opt->dst1opt; 947 opt->dst1opt = NULL; 948 opt->opt_flen -= dsthdrlen; 949 } 950 951 break; 952 953 case IPV6_2292HOPLIMIT: 954 case IPV6_HOPLIMIT: 955 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 956 err = -EINVAL; 957 goto exit_f; 958 } 959 960 ipc6->hlimit = *(int *)CMSG_DATA(cmsg); 961 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) { 962 err = -EINVAL; 963 goto exit_f; 964 } 965 966 break; 967 968 case IPV6_TCLASS: 969 { 970 int tc; 971 972 err = -EINVAL; 973 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 974 goto exit_f; 975 976 tc = *(int *)CMSG_DATA(cmsg); 977 if (tc < -1 || tc > 0xff) 978 goto exit_f; 979 980 err = 0; 981 ipc6->tclass = tc; 982 983 break; 984 } 985 986 case IPV6_DONTFRAG: 987 { 988 int df; 989 990 err = -EINVAL; 991 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 992 goto exit_f; 993 994 df = *(int *)CMSG_DATA(cmsg); 995 if (df < 0 || df > 1) 996 goto exit_f; 997 998 err = 0; 999 ipc6->dontfrag = df; 1000 1001 break; 1002 } 1003 default: 1004 net_dbg_ratelimited("invalid cmsg type: %d\n", 1005 cmsg->cmsg_type); 1006 err = -EINVAL; 1007 goto exit_f; 1008 } 1009 } 1010 1011 exit_f: 1012 return err; 1013 } 1014 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 1015 1016 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 1017 __u16 srcp, __u16 destp, int bucket) 1018 { 1019 const struct in6_addr *dest, *src; 1020 1021 dest = &sp->sk_v6_daddr; 1022 src = &sp->sk_v6_rcv_saddr; 1023 seq_printf(seq, 1024 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1025 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 1026 bucket, 1027 src->s6_addr32[0], src->s6_addr32[1], 1028 src->s6_addr32[2], src->s6_addr32[3], srcp, 1029 dest->s6_addr32[0], dest->s6_addr32[1], 1030 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1031 sp->sk_state, 1032 sk_wmem_alloc_get(sp), 1033 sk_rmem_alloc_get(sp), 1034 0, 0L, 0, 1035 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1036 0, 1037 sock_i_ino(sp), 1038 atomic_read(&sp->sk_refcnt), sp, 1039 atomic_read(&sp->sk_drops)); 1040 } 1041