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 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 44 { 45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 46 struct inet_sock *inet = inet_sk(sk); 47 struct ipv6_pinfo *np = inet6_sk(sk); 48 struct in6_addr *daddr, *final_p, final; 49 struct dst_entry *dst; 50 struct flowi6 fl6; 51 struct ip6_flowlabel *flowlabel = NULL; 52 struct ipv6_txoptions *opt; 53 int addr_type; 54 int err; 55 56 if (usin->sin6_family == AF_INET) { 57 if (__ipv6_only_sock(sk)) 58 return -EAFNOSUPPORT; 59 err = __ip4_datagram_connect(sk, uaddr, addr_len); 60 goto ipv4_connected; 61 } 62 63 if (addr_len < SIN6_LEN_RFC2133) 64 return -EINVAL; 65 66 if (usin->sin6_family != AF_INET6) 67 return -EAFNOSUPPORT; 68 69 memset(&fl6, 0, sizeof(fl6)); 70 if (np->sndflow) { 71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 74 if (!flowlabel) 75 return -EINVAL; 76 } 77 } 78 79 addr_type = ipv6_addr_type(&usin->sin6_addr); 80 81 if (addr_type == IPV6_ADDR_ANY) { 82 /* 83 * connect to self 84 */ 85 usin->sin6_addr.s6_addr[15] = 0x01; 86 } 87 88 daddr = &usin->sin6_addr; 89 90 if (addr_type == IPV6_ADDR_MAPPED) { 91 struct sockaddr_in sin; 92 93 if (__ipv6_only_sock(sk)) { 94 err = -ENETUNREACH; 95 goto out; 96 } 97 sin.sin_family = AF_INET; 98 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 99 sin.sin_port = usin->sin6_port; 100 101 err = __ip4_datagram_connect(sk, 102 (struct sockaddr *) &sin, 103 sizeof(sin)); 104 105 ipv4_connected: 106 if (err) 107 goto out; 108 109 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 110 111 if (ipv6_addr_any(&np->saddr) || 112 ipv6_mapped_addr_any(&np->saddr)) 113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 114 115 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 118 &sk->sk_v6_rcv_saddr); 119 if (sk->sk_prot->rehash) 120 sk->sk_prot->rehash(sk); 121 } 122 123 goto out; 124 } 125 126 if (__ipv6_addr_needs_scope_id(addr_type)) { 127 if (addr_len >= sizeof(struct sockaddr_in6) && 128 usin->sin6_scope_id) { 129 if (sk->sk_bound_dev_if && 130 sk->sk_bound_dev_if != usin->sin6_scope_id) { 131 err = -EINVAL; 132 goto out; 133 } 134 sk->sk_bound_dev_if = usin->sin6_scope_id; 135 } 136 137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 138 sk->sk_bound_dev_if = np->mcast_oif; 139 140 /* Connect to link-local address requires an interface */ 141 if (!sk->sk_bound_dev_if) { 142 err = -EINVAL; 143 goto out; 144 } 145 } 146 147 sk->sk_v6_daddr = *daddr; 148 np->flow_label = fl6.flowlabel; 149 150 inet->inet_dport = usin->sin6_port; 151 152 /* 153 * Check for a route to destination an obtain the 154 * destination cache for it. 155 */ 156 157 fl6.flowi6_proto = sk->sk_protocol; 158 fl6.daddr = sk->sk_v6_daddr; 159 fl6.saddr = np->saddr; 160 fl6.flowi6_oif = sk->sk_bound_dev_if; 161 fl6.flowi6_mark = sk->sk_mark; 162 fl6.fl6_dport = inet->inet_dport; 163 fl6.fl6_sport = inet->inet_sport; 164 165 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) 166 fl6.flowi6_oif = np->mcast_oif; 167 168 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 169 170 rcu_read_lock(); 171 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); 172 final_p = fl6_update_dst(&fl6, opt, &final); 173 rcu_read_unlock(); 174 175 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 176 err = 0; 177 if (IS_ERR(dst)) { 178 err = PTR_ERR(dst); 179 goto out; 180 } 181 182 /* source address lookup done in ip6_dst_lookup */ 183 184 if (ipv6_addr_any(&np->saddr)) 185 np->saddr = fl6.saddr; 186 187 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 188 sk->sk_v6_rcv_saddr = fl6.saddr; 189 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 190 if (sk->sk_prot->rehash) 191 sk->sk_prot->rehash(sk); 192 } 193 194 ip6_dst_store(sk, dst, 195 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 196 &sk->sk_v6_daddr : NULL, 197 #ifdef CONFIG_IPV6_SUBTREES 198 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 199 &np->saddr : 200 #endif 201 NULL); 202 203 sk->sk_state = TCP_ESTABLISHED; 204 sk_set_txhash(sk); 205 out: 206 fl6_sock_release(flowlabel); 207 return err; 208 } 209 210 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 211 { 212 int res; 213 214 lock_sock(sk); 215 res = __ip6_datagram_connect(sk, uaddr, addr_len); 216 release_sock(sk); 217 return res; 218 } 219 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 220 221 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 222 int addr_len) 223 { 224 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 225 if (sin6->sin6_family != AF_INET6) 226 return -EAFNOSUPPORT; 227 return ip6_datagram_connect(sk, uaddr, addr_len); 228 } 229 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 230 231 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 232 __be16 port, u32 info, u8 *payload) 233 { 234 struct ipv6_pinfo *np = inet6_sk(sk); 235 struct icmp6hdr *icmph = icmp6_hdr(skb); 236 struct sock_exterr_skb *serr; 237 238 if (!np->recverr) 239 return; 240 241 skb = skb_clone(skb, GFP_ATOMIC); 242 if (!skb) 243 return; 244 245 skb->protocol = htons(ETH_P_IPV6); 246 247 serr = SKB_EXT_ERR(skb); 248 serr->ee.ee_errno = err; 249 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 250 serr->ee.ee_type = icmph->icmp6_type; 251 serr->ee.ee_code = icmph->icmp6_code; 252 serr->ee.ee_pad = 0; 253 serr->ee.ee_info = info; 254 serr->ee.ee_data = 0; 255 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 256 skb_network_header(skb); 257 serr->port = port; 258 259 __skb_pull(skb, payload - skb->data); 260 skb_reset_transport_header(skb); 261 262 if (sock_queue_err_skb(sk, skb)) 263 kfree_skb(skb); 264 } 265 266 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 267 { 268 const struct ipv6_pinfo *np = inet6_sk(sk); 269 struct sock_exterr_skb *serr; 270 struct ipv6hdr *iph; 271 struct sk_buff *skb; 272 273 if (!np->recverr) 274 return; 275 276 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 277 if (!skb) 278 return; 279 280 skb->protocol = htons(ETH_P_IPV6); 281 282 skb_put(skb, sizeof(struct ipv6hdr)); 283 skb_reset_network_header(skb); 284 iph = ipv6_hdr(skb); 285 iph->daddr = fl6->daddr; 286 287 serr = SKB_EXT_ERR(skb); 288 serr->ee.ee_errno = err; 289 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 290 serr->ee.ee_type = 0; 291 serr->ee.ee_code = 0; 292 serr->ee.ee_pad = 0; 293 serr->ee.ee_info = info; 294 serr->ee.ee_data = 0; 295 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 296 serr->port = fl6->fl6_dport; 297 298 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 299 skb_reset_transport_header(skb); 300 301 if (sock_queue_err_skb(sk, skb)) 302 kfree_skb(skb); 303 } 304 305 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 306 { 307 struct ipv6_pinfo *np = inet6_sk(sk); 308 struct ipv6hdr *iph; 309 struct sk_buff *skb; 310 struct ip6_mtuinfo *mtu_info; 311 312 if (!np->rxopt.bits.rxpmtu) 313 return; 314 315 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 316 if (!skb) 317 return; 318 319 skb_put(skb, sizeof(struct ipv6hdr)); 320 skb_reset_network_header(skb); 321 iph = ipv6_hdr(skb); 322 iph->daddr = fl6->daddr; 323 324 mtu_info = IP6CBMTU(skb); 325 326 mtu_info->ip6m_mtu = mtu; 327 mtu_info->ip6m_addr.sin6_family = AF_INET6; 328 mtu_info->ip6m_addr.sin6_port = 0; 329 mtu_info->ip6m_addr.sin6_flowinfo = 0; 330 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 331 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 332 333 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 334 skb_reset_transport_header(skb); 335 336 skb = xchg(&np->rxpmtu, skb); 337 kfree_skb(skb); 338 } 339 340 /* For some errors we have valid addr_offset even with zero payload and 341 * zero port. Also, addr_offset should be supported if port is set. 342 */ 343 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 344 { 345 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 346 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 347 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 348 } 349 350 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 351 * 352 * At one point, excluding local errors was a quick test to identify icmp/icmp6 353 * errors. This is no longer true, but the test remained, so the v6 stack, 354 * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 355 * 356 * Timestamp code paths do not initialize the fields expected by cmsg: 357 * the PKTINFO fields in skb->cb[]. Fill those in here. 358 */ 359 static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 360 struct sock_exterr_skb *serr) 361 { 362 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 363 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 364 return true; 365 366 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 367 return false; 368 369 if (!skb->dev) 370 return false; 371 372 if (skb->protocol == htons(ETH_P_IPV6)) 373 IP6CB(skb)->iif = skb->dev->ifindex; 374 else 375 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 376 377 return true; 378 } 379 380 /* 381 * Handle MSG_ERRQUEUE 382 */ 383 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 384 { 385 struct ipv6_pinfo *np = inet6_sk(sk); 386 struct sock_exterr_skb *serr; 387 struct sk_buff *skb; 388 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 389 struct { 390 struct sock_extended_err ee; 391 struct sockaddr_in6 offender; 392 } errhdr; 393 int err; 394 int copied; 395 396 err = -EAGAIN; 397 skb = sock_dequeue_err_skb(sk); 398 if (!skb) 399 goto out; 400 401 copied = skb->len; 402 if (copied > len) { 403 msg->msg_flags |= MSG_TRUNC; 404 copied = len; 405 } 406 err = skb_copy_datagram_msg(skb, 0, msg, copied); 407 if (err) 408 goto out_free_skb; 409 410 sock_recv_timestamp(msg, sk, skb); 411 412 serr = SKB_EXT_ERR(skb); 413 414 if (sin && ipv6_datagram_support_addr(serr)) { 415 const unsigned char *nh = skb_network_header(skb); 416 sin->sin6_family = AF_INET6; 417 sin->sin6_flowinfo = 0; 418 sin->sin6_port = serr->port; 419 if (skb->protocol == htons(ETH_P_IPV6)) { 420 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 421 struct ipv6hdr, daddr); 422 sin->sin6_addr = ip6h->daddr; 423 if (np->sndflow) 424 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 425 sin->sin6_scope_id = 426 ipv6_iface_scope_id(&sin->sin6_addr, 427 IP6CB(skb)->iif); 428 } else { 429 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 430 &sin->sin6_addr); 431 sin->sin6_scope_id = 0; 432 } 433 *addr_len = sizeof(*sin); 434 } 435 436 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 437 sin = &errhdr.offender; 438 memset(sin, 0, sizeof(*sin)); 439 440 if (ip6_datagram_support_cmsg(skb, serr)) { 441 sin->sin6_family = AF_INET6; 442 if (np->rxopt.all) 443 ip6_datagram_recv_common_ctl(sk, msg, skb); 444 if (skb->protocol == htons(ETH_P_IPV6)) { 445 sin->sin6_addr = ipv6_hdr(skb)->saddr; 446 if (np->rxopt.all) 447 ip6_datagram_recv_specific_ctl(sk, msg, skb); 448 sin->sin6_scope_id = 449 ipv6_iface_scope_id(&sin->sin6_addr, 450 IP6CB(skb)->iif); 451 } else { 452 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 453 &sin->sin6_addr); 454 if (inet_sk(sk)->cmsg_flags) 455 ip_cmsg_recv(msg, skb); 456 } 457 } 458 459 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 460 461 /* Now we could try to dump offended packet options */ 462 463 msg->msg_flags |= MSG_ERRQUEUE; 464 err = copied; 465 466 out_free_skb: 467 kfree_skb(skb); 468 out: 469 return err; 470 } 471 EXPORT_SYMBOL_GPL(ipv6_recv_error); 472 473 /* 474 * Handle IPV6_RECVPATHMTU 475 */ 476 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 477 int *addr_len) 478 { 479 struct ipv6_pinfo *np = inet6_sk(sk); 480 struct sk_buff *skb; 481 struct ip6_mtuinfo mtu_info; 482 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 483 int err; 484 int copied; 485 486 err = -EAGAIN; 487 skb = xchg(&np->rxpmtu, NULL); 488 if (!skb) 489 goto out; 490 491 copied = skb->len; 492 if (copied > len) { 493 msg->msg_flags |= MSG_TRUNC; 494 copied = len; 495 } 496 err = skb_copy_datagram_msg(skb, 0, msg, copied); 497 if (err) 498 goto out_free_skb; 499 500 sock_recv_timestamp(msg, sk, skb); 501 502 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 503 504 if (sin) { 505 sin->sin6_family = AF_INET6; 506 sin->sin6_flowinfo = 0; 507 sin->sin6_port = 0; 508 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 509 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 510 *addr_len = sizeof(*sin); 511 } 512 513 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 514 515 err = copied; 516 517 out_free_skb: 518 kfree_skb(skb); 519 out: 520 return err; 521 } 522 523 524 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 525 struct sk_buff *skb) 526 { 527 struct ipv6_pinfo *np = inet6_sk(sk); 528 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 529 530 if (np->rxopt.bits.rxinfo) { 531 struct in6_pktinfo src_info; 532 533 if (is_ipv6) { 534 src_info.ipi6_ifindex = IP6CB(skb)->iif; 535 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 536 } else { 537 src_info.ipi6_ifindex = 538 PKTINFO_SKB_CB(skb)->ipi_ifindex; 539 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 540 &src_info.ipi6_addr); 541 } 542 543 if (src_info.ipi6_ifindex >= 0) 544 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 545 sizeof(src_info), &src_info); 546 } 547 } 548 549 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 550 struct sk_buff *skb) 551 { 552 struct ipv6_pinfo *np = inet6_sk(sk); 553 struct inet6_skb_parm *opt = IP6CB(skb); 554 unsigned char *nh = skb_network_header(skb); 555 556 if (np->rxopt.bits.rxhlim) { 557 int hlim = ipv6_hdr(skb)->hop_limit; 558 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 559 } 560 561 if (np->rxopt.bits.rxtclass) { 562 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 563 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 564 } 565 566 if (np->rxopt.bits.rxflow) { 567 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 568 if (flowinfo) 569 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 570 } 571 572 /* HbH is allowed only once */ 573 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 574 u8 *ptr = nh + sizeof(struct ipv6hdr); 575 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 576 } 577 578 if (opt->lastopt && 579 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 580 /* 581 * Silly enough, but we need to reparse in order to 582 * report extension headers (except for HbH) 583 * in order. 584 * 585 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 586 * (and WILL NOT be) defined because 587 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 588 */ 589 unsigned int off = sizeof(struct ipv6hdr); 590 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 591 592 while (off <= opt->lastopt) { 593 unsigned int len; 594 u8 *ptr = nh + off; 595 596 switch (nexthdr) { 597 case IPPROTO_DSTOPTS: 598 nexthdr = ptr[0]; 599 len = (ptr[1] + 1) << 3; 600 if (np->rxopt.bits.dstopts) 601 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 602 break; 603 case IPPROTO_ROUTING: 604 nexthdr = ptr[0]; 605 len = (ptr[1] + 1) << 3; 606 if (np->rxopt.bits.srcrt) 607 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 608 break; 609 case IPPROTO_AH: 610 nexthdr = ptr[0]; 611 len = (ptr[1] + 2) << 2; 612 break; 613 default: 614 nexthdr = ptr[0]; 615 len = (ptr[1] + 1) << 3; 616 break; 617 } 618 619 off += len; 620 } 621 } 622 623 /* socket options in old style */ 624 if (np->rxopt.bits.rxoinfo) { 625 struct in6_pktinfo src_info; 626 627 src_info.ipi6_ifindex = opt->iif; 628 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 629 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 630 } 631 if (np->rxopt.bits.rxohlim) { 632 int hlim = ipv6_hdr(skb)->hop_limit; 633 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 634 } 635 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 636 u8 *ptr = nh + sizeof(struct ipv6hdr); 637 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 638 } 639 if (np->rxopt.bits.odstopts && opt->dst0) { 640 u8 *ptr = nh + opt->dst0; 641 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 642 } 643 if (np->rxopt.bits.osrcrt && opt->srcrt) { 644 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 645 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 646 } 647 if (np->rxopt.bits.odstopts && opt->dst1) { 648 u8 *ptr = nh + opt->dst1; 649 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 650 } 651 if (np->rxopt.bits.rxorigdstaddr) { 652 struct sockaddr_in6 sin6; 653 __be16 *ports = (__be16 *) skb_transport_header(skb); 654 655 if (skb_transport_offset(skb) + 4 <= skb->len) { 656 /* All current transport protocols have the port numbers in the 657 * first four bytes of the transport header and this function is 658 * written with this assumption in mind. 659 */ 660 661 sin6.sin6_family = AF_INET6; 662 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 663 sin6.sin6_port = ports[1]; 664 sin6.sin6_flowinfo = 0; 665 sin6.sin6_scope_id = 666 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 667 opt->iif); 668 669 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 670 } 671 } 672 } 673 674 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 675 struct sk_buff *skb) 676 { 677 ip6_datagram_recv_common_ctl(sk, msg, skb); 678 ip6_datagram_recv_specific_ctl(sk, msg, skb); 679 } 680 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 681 682 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 683 struct msghdr *msg, struct flowi6 *fl6, 684 struct ipv6_txoptions *opt, 685 int *hlimit, int *tclass, int *dontfrag) 686 { 687 struct in6_pktinfo *src_info; 688 struct cmsghdr *cmsg; 689 struct ipv6_rt_hdr *rthdr; 690 struct ipv6_opt_hdr *hdr; 691 int len; 692 int err = 0; 693 694 for_each_cmsghdr(cmsg, msg) { 695 int addr_type; 696 697 if (!CMSG_OK(msg, cmsg)) { 698 err = -EINVAL; 699 goto exit_f; 700 } 701 702 if (cmsg->cmsg_level != SOL_IPV6) 703 continue; 704 705 switch (cmsg->cmsg_type) { 706 case IPV6_PKTINFO: 707 case IPV6_2292PKTINFO: 708 { 709 struct net_device *dev = NULL; 710 711 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 712 err = -EINVAL; 713 goto exit_f; 714 } 715 716 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 717 718 if (src_info->ipi6_ifindex) { 719 if (fl6->flowi6_oif && 720 src_info->ipi6_ifindex != fl6->flowi6_oif) 721 return -EINVAL; 722 fl6->flowi6_oif = src_info->ipi6_ifindex; 723 } 724 725 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 726 727 rcu_read_lock(); 728 if (fl6->flowi6_oif) { 729 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 730 if (!dev) { 731 rcu_read_unlock(); 732 return -ENODEV; 733 } 734 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 735 rcu_read_unlock(); 736 return -EINVAL; 737 } 738 739 if (addr_type != IPV6_ADDR_ANY) { 740 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 741 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 742 !ipv6_chk_addr(net, &src_info->ipi6_addr, 743 strict ? dev : NULL, 0) && 744 !ipv6_chk_acast_addr_src(net, dev, 745 &src_info->ipi6_addr)) 746 err = -EINVAL; 747 else 748 fl6->saddr = src_info->ipi6_addr; 749 } 750 751 rcu_read_unlock(); 752 753 if (err) 754 goto exit_f; 755 756 break; 757 } 758 759 case IPV6_FLOWINFO: 760 if (cmsg->cmsg_len < CMSG_LEN(4)) { 761 err = -EINVAL; 762 goto exit_f; 763 } 764 765 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 766 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 767 err = -EINVAL; 768 goto exit_f; 769 } 770 } 771 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 772 break; 773 774 case IPV6_2292HOPOPTS: 775 case IPV6_HOPOPTS: 776 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 777 err = -EINVAL; 778 goto exit_f; 779 } 780 781 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 782 len = ((hdr->hdrlen + 1) << 3); 783 if (cmsg->cmsg_len < CMSG_LEN(len)) { 784 err = -EINVAL; 785 goto exit_f; 786 } 787 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 788 err = -EPERM; 789 goto exit_f; 790 } 791 opt->opt_nflen += len; 792 opt->hopopt = hdr; 793 break; 794 795 case IPV6_2292DSTOPTS: 796 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 797 err = -EINVAL; 798 goto exit_f; 799 } 800 801 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 802 len = ((hdr->hdrlen + 1) << 3); 803 if (cmsg->cmsg_len < CMSG_LEN(len)) { 804 err = -EINVAL; 805 goto exit_f; 806 } 807 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 808 err = -EPERM; 809 goto exit_f; 810 } 811 if (opt->dst1opt) { 812 err = -EINVAL; 813 goto exit_f; 814 } 815 opt->opt_flen += len; 816 opt->dst1opt = hdr; 817 break; 818 819 case IPV6_DSTOPTS: 820 case IPV6_RTHDRDSTOPTS: 821 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 822 err = -EINVAL; 823 goto exit_f; 824 } 825 826 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 827 len = ((hdr->hdrlen + 1) << 3); 828 if (cmsg->cmsg_len < CMSG_LEN(len)) { 829 err = -EINVAL; 830 goto exit_f; 831 } 832 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 833 err = -EPERM; 834 goto exit_f; 835 } 836 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 837 opt->opt_flen += len; 838 opt->dst1opt = hdr; 839 } else { 840 opt->opt_nflen += len; 841 opt->dst0opt = hdr; 842 } 843 break; 844 845 case IPV6_2292RTHDR: 846 case IPV6_RTHDR: 847 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 848 err = -EINVAL; 849 goto exit_f; 850 } 851 852 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 853 854 switch (rthdr->type) { 855 #if IS_ENABLED(CONFIG_IPV6_MIP6) 856 case IPV6_SRCRT_TYPE_2: 857 if (rthdr->hdrlen != 2 || 858 rthdr->segments_left != 1) { 859 err = -EINVAL; 860 goto exit_f; 861 } 862 break; 863 #endif 864 default: 865 err = -EINVAL; 866 goto exit_f; 867 } 868 869 len = ((rthdr->hdrlen + 1) << 3); 870 871 if (cmsg->cmsg_len < CMSG_LEN(len)) { 872 err = -EINVAL; 873 goto exit_f; 874 } 875 876 /* segments left must also match */ 877 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 878 err = -EINVAL; 879 goto exit_f; 880 } 881 882 opt->opt_nflen += len; 883 opt->srcrt = rthdr; 884 885 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 886 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 887 888 opt->opt_nflen += dsthdrlen; 889 opt->dst0opt = opt->dst1opt; 890 opt->dst1opt = NULL; 891 opt->opt_flen -= dsthdrlen; 892 } 893 894 break; 895 896 case IPV6_2292HOPLIMIT: 897 case IPV6_HOPLIMIT: 898 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 899 err = -EINVAL; 900 goto exit_f; 901 } 902 903 *hlimit = *(int *)CMSG_DATA(cmsg); 904 if (*hlimit < -1 || *hlimit > 0xff) { 905 err = -EINVAL; 906 goto exit_f; 907 } 908 909 break; 910 911 case IPV6_TCLASS: 912 { 913 int tc; 914 915 err = -EINVAL; 916 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 917 goto exit_f; 918 919 tc = *(int *)CMSG_DATA(cmsg); 920 if (tc < -1 || tc > 0xff) 921 goto exit_f; 922 923 err = 0; 924 *tclass = tc; 925 926 break; 927 } 928 929 case IPV6_DONTFRAG: 930 { 931 int df; 932 933 err = -EINVAL; 934 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 935 goto exit_f; 936 937 df = *(int *)CMSG_DATA(cmsg); 938 if (df < 0 || df > 1) 939 goto exit_f; 940 941 err = 0; 942 *dontfrag = df; 943 944 break; 945 } 946 default: 947 net_dbg_ratelimited("invalid cmsg type: %d\n", 948 cmsg->cmsg_type); 949 err = -EINVAL; 950 goto exit_f; 951 } 952 } 953 954 exit_f: 955 return err; 956 } 957 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 958 959 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 960 __u16 srcp, __u16 destp, int bucket) 961 { 962 const struct in6_addr *dest, *src; 963 964 dest = &sp->sk_v6_daddr; 965 src = &sp->sk_v6_rcv_saddr; 966 seq_printf(seq, 967 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 968 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 969 bucket, 970 src->s6_addr32[0], src->s6_addr32[1], 971 src->s6_addr32[2], src->s6_addr32[3], srcp, 972 dest->s6_addr32[0], dest->s6_addr32[1], 973 dest->s6_addr32[2], dest->s6_addr32[3], destp, 974 sp->sk_state, 975 sk_wmem_alloc_get(sp), 976 sk_rmem_alloc_get(sp), 977 0, 0L, 0, 978 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 979 0, 980 sock_i_ino(sp), 981 atomic_read(&sp->sk_refcnt), sp, 982 atomic_read(&sp->sk_drops)); 983 } 984