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) 166 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 167 168 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) 169 fl6.flowi6_oif = np->mcast_oif; 170 171 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 172 173 rcu_read_lock(); 174 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); 175 final_p = fl6_update_dst(&fl6, opt, &final); 176 rcu_read_unlock(); 177 178 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 179 err = 0; 180 if (IS_ERR(dst)) { 181 err = PTR_ERR(dst); 182 goto out; 183 } 184 185 /* source address lookup done in ip6_dst_lookup */ 186 187 if (ipv6_addr_any(&np->saddr)) 188 np->saddr = fl6.saddr; 189 190 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 191 sk->sk_v6_rcv_saddr = fl6.saddr; 192 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 193 if (sk->sk_prot->rehash) 194 sk->sk_prot->rehash(sk); 195 } 196 197 ip6_dst_store(sk, dst, 198 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 199 &sk->sk_v6_daddr : NULL, 200 #ifdef CONFIG_IPV6_SUBTREES 201 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 202 &np->saddr : 203 #endif 204 NULL); 205 206 sk->sk_state = TCP_ESTABLISHED; 207 sk_set_txhash(sk); 208 out: 209 fl6_sock_release(flowlabel); 210 return err; 211 } 212 213 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 214 { 215 int res; 216 217 lock_sock(sk); 218 res = __ip6_datagram_connect(sk, uaddr, addr_len); 219 release_sock(sk); 220 return res; 221 } 222 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 223 224 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 225 int addr_len) 226 { 227 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 228 if (sin6->sin6_family != AF_INET6) 229 return -EAFNOSUPPORT; 230 return ip6_datagram_connect(sk, uaddr, addr_len); 231 } 232 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 233 234 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 235 __be16 port, u32 info, u8 *payload) 236 { 237 struct ipv6_pinfo *np = inet6_sk(sk); 238 struct icmp6hdr *icmph = icmp6_hdr(skb); 239 struct sock_exterr_skb *serr; 240 241 if (!np->recverr) 242 return; 243 244 skb = skb_clone(skb, GFP_ATOMIC); 245 if (!skb) 246 return; 247 248 skb->protocol = htons(ETH_P_IPV6); 249 250 serr = SKB_EXT_ERR(skb); 251 serr->ee.ee_errno = err; 252 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 253 serr->ee.ee_type = icmph->icmp6_type; 254 serr->ee.ee_code = icmph->icmp6_code; 255 serr->ee.ee_pad = 0; 256 serr->ee.ee_info = info; 257 serr->ee.ee_data = 0; 258 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 259 skb_network_header(skb); 260 serr->port = port; 261 262 __skb_pull(skb, payload - skb->data); 263 skb_reset_transport_header(skb); 264 265 if (sock_queue_err_skb(sk, skb)) 266 kfree_skb(skb); 267 } 268 269 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 270 { 271 const struct ipv6_pinfo *np = inet6_sk(sk); 272 struct sock_exterr_skb *serr; 273 struct ipv6hdr *iph; 274 struct sk_buff *skb; 275 276 if (!np->recverr) 277 return; 278 279 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 280 if (!skb) 281 return; 282 283 skb->protocol = htons(ETH_P_IPV6); 284 285 skb_put(skb, sizeof(struct ipv6hdr)); 286 skb_reset_network_header(skb); 287 iph = ipv6_hdr(skb); 288 iph->daddr = fl6->daddr; 289 290 serr = SKB_EXT_ERR(skb); 291 serr->ee.ee_errno = err; 292 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 293 serr->ee.ee_type = 0; 294 serr->ee.ee_code = 0; 295 serr->ee.ee_pad = 0; 296 serr->ee.ee_info = info; 297 serr->ee.ee_data = 0; 298 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 299 serr->port = fl6->fl6_dport; 300 301 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 302 skb_reset_transport_header(skb); 303 304 if (sock_queue_err_skb(sk, skb)) 305 kfree_skb(skb); 306 } 307 308 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 309 { 310 struct ipv6_pinfo *np = inet6_sk(sk); 311 struct ipv6hdr *iph; 312 struct sk_buff *skb; 313 struct ip6_mtuinfo *mtu_info; 314 315 if (!np->rxopt.bits.rxpmtu) 316 return; 317 318 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 319 if (!skb) 320 return; 321 322 skb_put(skb, sizeof(struct ipv6hdr)); 323 skb_reset_network_header(skb); 324 iph = ipv6_hdr(skb); 325 iph->daddr = fl6->daddr; 326 327 mtu_info = IP6CBMTU(skb); 328 329 mtu_info->ip6m_mtu = mtu; 330 mtu_info->ip6m_addr.sin6_family = AF_INET6; 331 mtu_info->ip6m_addr.sin6_port = 0; 332 mtu_info->ip6m_addr.sin6_flowinfo = 0; 333 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 334 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 335 336 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 337 skb_reset_transport_header(skb); 338 339 skb = xchg(&np->rxpmtu, skb); 340 kfree_skb(skb); 341 } 342 343 /* For some errors we have valid addr_offset even with zero payload and 344 * zero port. Also, addr_offset should be supported if port is set. 345 */ 346 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 347 { 348 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 349 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 350 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 351 } 352 353 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 354 * 355 * At one point, excluding local errors was a quick test to identify icmp/icmp6 356 * errors. This is no longer true, but the test remained, so the v6 stack, 357 * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 358 * 359 * Timestamp code paths do not initialize the fields expected by cmsg: 360 * the PKTINFO fields in skb->cb[]. Fill those in here. 361 */ 362 static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 363 struct sock_exterr_skb *serr) 364 { 365 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 366 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 367 return true; 368 369 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 370 return false; 371 372 if (!skb->dev) 373 return false; 374 375 if (skb->protocol == htons(ETH_P_IPV6)) 376 IP6CB(skb)->iif = skb->dev->ifindex; 377 else 378 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 379 380 return true; 381 } 382 383 /* 384 * Handle MSG_ERRQUEUE 385 */ 386 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 387 { 388 struct ipv6_pinfo *np = inet6_sk(sk); 389 struct sock_exterr_skb *serr; 390 struct sk_buff *skb; 391 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 392 struct { 393 struct sock_extended_err ee; 394 struct sockaddr_in6 offender; 395 } errhdr; 396 int err; 397 int copied; 398 399 err = -EAGAIN; 400 skb = sock_dequeue_err_skb(sk); 401 if (!skb) 402 goto out; 403 404 copied = skb->len; 405 if (copied > len) { 406 msg->msg_flags |= MSG_TRUNC; 407 copied = len; 408 } 409 err = skb_copy_datagram_msg(skb, 0, msg, copied); 410 if (err) 411 goto out_free_skb; 412 413 sock_recv_timestamp(msg, sk, skb); 414 415 serr = SKB_EXT_ERR(skb); 416 417 if (sin && ipv6_datagram_support_addr(serr)) { 418 const unsigned char *nh = skb_network_header(skb); 419 sin->sin6_family = AF_INET6; 420 sin->sin6_flowinfo = 0; 421 sin->sin6_port = serr->port; 422 if (skb->protocol == htons(ETH_P_IPV6)) { 423 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 424 struct ipv6hdr, daddr); 425 sin->sin6_addr = ip6h->daddr; 426 if (np->sndflow) 427 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 428 sin->sin6_scope_id = 429 ipv6_iface_scope_id(&sin->sin6_addr, 430 IP6CB(skb)->iif); 431 } else { 432 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 433 &sin->sin6_addr); 434 sin->sin6_scope_id = 0; 435 } 436 *addr_len = sizeof(*sin); 437 } 438 439 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 440 sin = &errhdr.offender; 441 memset(sin, 0, sizeof(*sin)); 442 443 if (ip6_datagram_support_cmsg(skb, serr)) { 444 sin->sin6_family = AF_INET6; 445 if (np->rxopt.all) 446 ip6_datagram_recv_common_ctl(sk, msg, skb); 447 if (skb->protocol == htons(ETH_P_IPV6)) { 448 sin->sin6_addr = ipv6_hdr(skb)->saddr; 449 if (np->rxopt.all) 450 ip6_datagram_recv_specific_ctl(sk, msg, skb); 451 sin->sin6_scope_id = 452 ipv6_iface_scope_id(&sin->sin6_addr, 453 IP6CB(skb)->iif); 454 } else { 455 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 456 &sin->sin6_addr); 457 if (inet_sk(sk)->cmsg_flags) 458 ip_cmsg_recv(msg, skb); 459 } 460 } 461 462 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 463 464 /* Now we could try to dump offended packet options */ 465 466 msg->msg_flags |= MSG_ERRQUEUE; 467 err = copied; 468 469 out_free_skb: 470 kfree_skb(skb); 471 out: 472 return err; 473 } 474 EXPORT_SYMBOL_GPL(ipv6_recv_error); 475 476 /* 477 * Handle IPV6_RECVPATHMTU 478 */ 479 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 480 int *addr_len) 481 { 482 struct ipv6_pinfo *np = inet6_sk(sk); 483 struct sk_buff *skb; 484 struct ip6_mtuinfo mtu_info; 485 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 486 int err; 487 int copied; 488 489 err = -EAGAIN; 490 skb = xchg(&np->rxpmtu, NULL); 491 if (!skb) 492 goto out; 493 494 copied = skb->len; 495 if (copied > len) { 496 msg->msg_flags |= MSG_TRUNC; 497 copied = len; 498 } 499 err = skb_copy_datagram_msg(skb, 0, msg, copied); 500 if (err) 501 goto out_free_skb; 502 503 sock_recv_timestamp(msg, sk, skb); 504 505 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 506 507 if (sin) { 508 sin->sin6_family = AF_INET6; 509 sin->sin6_flowinfo = 0; 510 sin->sin6_port = 0; 511 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 512 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 513 *addr_len = sizeof(*sin); 514 } 515 516 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 517 518 err = copied; 519 520 out_free_skb: 521 kfree_skb(skb); 522 out: 523 return err; 524 } 525 526 527 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 528 struct sk_buff *skb) 529 { 530 struct ipv6_pinfo *np = inet6_sk(sk); 531 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 532 533 if (np->rxopt.bits.rxinfo) { 534 struct in6_pktinfo src_info; 535 536 if (is_ipv6) { 537 src_info.ipi6_ifindex = IP6CB(skb)->iif; 538 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 539 } else { 540 src_info.ipi6_ifindex = 541 PKTINFO_SKB_CB(skb)->ipi_ifindex; 542 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 543 &src_info.ipi6_addr); 544 } 545 546 if (src_info.ipi6_ifindex >= 0) 547 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 548 sizeof(src_info), &src_info); 549 } 550 } 551 552 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 553 struct sk_buff *skb) 554 { 555 struct ipv6_pinfo *np = inet6_sk(sk); 556 struct inet6_skb_parm *opt = IP6CB(skb); 557 unsigned char *nh = skb_network_header(skb); 558 559 if (np->rxopt.bits.rxhlim) { 560 int hlim = ipv6_hdr(skb)->hop_limit; 561 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 562 } 563 564 if (np->rxopt.bits.rxtclass) { 565 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 566 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 567 } 568 569 if (np->rxopt.bits.rxflow) { 570 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 571 if (flowinfo) 572 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 573 } 574 575 /* HbH is allowed only once */ 576 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 577 u8 *ptr = nh + sizeof(struct ipv6hdr); 578 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 579 } 580 581 if (opt->lastopt && 582 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 583 /* 584 * Silly enough, but we need to reparse in order to 585 * report extension headers (except for HbH) 586 * in order. 587 * 588 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 589 * (and WILL NOT be) defined because 590 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 591 */ 592 unsigned int off = sizeof(struct ipv6hdr); 593 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 594 595 while (off <= opt->lastopt) { 596 unsigned int len; 597 u8 *ptr = nh + off; 598 599 switch (nexthdr) { 600 case IPPROTO_DSTOPTS: 601 nexthdr = ptr[0]; 602 len = (ptr[1] + 1) << 3; 603 if (np->rxopt.bits.dstopts) 604 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 605 break; 606 case IPPROTO_ROUTING: 607 nexthdr = ptr[0]; 608 len = (ptr[1] + 1) << 3; 609 if (np->rxopt.bits.srcrt) 610 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 611 break; 612 case IPPROTO_AH: 613 nexthdr = ptr[0]; 614 len = (ptr[1] + 2) << 2; 615 break; 616 default: 617 nexthdr = ptr[0]; 618 len = (ptr[1] + 1) << 3; 619 break; 620 } 621 622 off += len; 623 } 624 } 625 626 /* socket options in old style */ 627 if (np->rxopt.bits.rxoinfo) { 628 struct in6_pktinfo src_info; 629 630 src_info.ipi6_ifindex = opt->iif; 631 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 632 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 633 } 634 if (np->rxopt.bits.rxohlim) { 635 int hlim = ipv6_hdr(skb)->hop_limit; 636 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 637 } 638 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { 639 u8 *ptr = nh + sizeof(struct ipv6hdr); 640 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 641 } 642 if (np->rxopt.bits.odstopts && opt->dst0) { 643 u8 *ptr = nh + opt->dst0; 644 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 645 } 646 if (np->rxopt.bits.osrcrt && opt->srcrt) { 647 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 648 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 649 } 650 if (np->rxopt.bits.odstopts && opt->dst1) { 651 u8 *ptr = nh + opt->dst1; 652 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 653 } 654 if (np->rxopt.bits.rxorigdstaddr) { 655 struct sockaddr_in6 sin6; 656 __be16 *ports = (__be16 *) skb_transport_header(skb); 657 658 if (skb_transport_offset(skb) + 4 <= skb->len) { 659 /* All current transport protocols have the port numbers in the 660 * first four bytes of the transport header and this function is 661 * written with this assumption in mind. 662 */ 663 664 sin6.sin6_family = AF_INET6; 665 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 666 sin6.sin6_port = ports[1]; 667 sin6.sin6_flowinfo = 0; 668 sin6.sin6_scope_id = 669 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 670 opt->iif); 671 672 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 673 } 674 } 675 } 676 677 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 678 struct sk_buff *skb) 679 { 680 ip6_datagram_recv_common_ctl(sk, msg, skb); 681 ip6_datagram_recv_specific_ctl(sk, msg, skb); 682 } 683 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 684 685 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 686 struct msghdr *msg, struct flowi6 *fl6, 687 struct ipv6_txoptions *opt, 688 int *hlimit, int *tclass, int *dontfrag) 689 { 690 struct in6_pktinfo *src_info; 691 struct cmsghdr *cmsg; 692 struct ipv6_rt_hdr *rthdr; 693 struct ipv6_opt_hdr *hdr; 694 int len; 695 int err = 0; 696 697 for_each_cmsghdr(cmsg, msg) { 698 int addr_type; 699 700 if (!CMSG_OK(msg, cmsg)) { 701 err = -EINVAL; 702 goto exit_f; 703 } 704 705 if (cmsg->cmsg_level != SOL_IPV6) 706 continue; 707 708 switch (cmsg->cmsg_type) { 709 case IPV6_PKTINFO: 710 case IPV6_2292PKTINFO: 711 { 712 struct net_device *dev = NULL; 713 714 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 715 err = -EINVAL; 716 goto exit_f; 717 } 718 719 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 720 721 if (src_info->ipi6_ifindex) { 722 if (fl6->flowi6_oif && 723 src_info->ipi6_ifindex != fl6->flowi6_oif) 724 return -EINVAL; 725 fl6->flowi6_oif = src_info->ipi6_ifindex; 726 } 727 728 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 729 730 rcu_read_lock(); 731 if (fl6->flowi6_oif) { 732 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 733 if (!dev) { 734 rcu_read_unlock(); 735 return -ENODEV; 736 } 737 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 738 rcu_read_unlock(); 739 return -EINVAL; 740 } 741 742 if (addr_type != IPV6_ADDR_ANY) { 743 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 744 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 745 !ipv6_chk_addr(net, &src_info->ipi6_addr, 746 strict ? dev : NULL, 0) && 747 !ipv6_chk_acast_addr_src(net, dev, 748 &src_info->ipi6_addr)) 749 err = -EINVAL; 750 else 751 fl6->saddr = src_info->ipi6_addr; 752 } 753 754 rcu_read_unlock(); 755 756 if (err) 757 goto exit_f; 758 759 break; 760 } 761 762 case IPV6_FLOWINFO: 763 if (cmsg->cmsg_len < CMSG_LEN(4)) { 764 err = -EINVAL; 765 goto exit_f; 766 } 767 768 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 769 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 770 err = -EINVAL; 771 goto exit_f; 772 } 773 } 774 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 775 break; 776 777 case IPV6_2292HOPOPTS: 778 case IPV6_HOPOPTS: 779 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 780 err = -EINVAL; 781 goto exit_f; 782 } 783 784 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 785 len = ((hdr->hdrlen + 1) << 3); 786 if (cmsg->cmsg_len < CMSG_LEN(len)) { 787 err = -EINVAL; 788 goto exit_f; 789 } 790 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 791 err = -EPERM; 792 goto exit_f; 793 } 794 opt->opt_nflen += len; 795 opt->hopopt = hdr; 796 break; 797 798 case IPV6_2292DSTOPTS: 799 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 800 err = -EINVAL; 801 goto exit_f; 802 } 803 804 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 805 len = ((hdr->hdrlen + 1) << 3); 806 if (cmsg->cmsg_len < CMSG_LEN(len)) { 807 err = -EINVAL; 808 goto exit_f; 809 } 810 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 811 err = -EPERM; 812 goto exit_f; 813 } 814 if (opt->dst1opt) { 815 err = -EINVAL; 816 goto exit_f; 817 } 818 opt->opt_flen += len; 819 opt->dst1opt = hdr; 820 break; 821 822 case IPV6_DSTOPTS: 823 case IPV6_RTHDRDSTOPTS: 824 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 825 err = -EINVAL; 826 goto exit_f; 827 } 828 829 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 830 len = ((hdr->hdrlen + 1) << 3); 831 if (cmsg->cmsg_len < CMSG_LEN(len)) { 832 err = -EINVAL; 833 goto exit_f; 834 } 835 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 836 err = -EPERM; 837 goto exit_f; 838 } 839 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 840 opt->opt_flen += len; 841 opt->dst1opt = hdr; 842 } else { 843 opt->opt_nflen += len; 844 opt->dst0opt = hdr; 845 } 846 break; 847 848 case IPV6_2292RTHDR: 849 case IPV6_RTHDR: 850 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 851 err = -EINVAL; 852 goto exit_f; 853 } 854 855 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 856 857 switch (rthdr->type) { 858 #if IS_ENABLED(CONFIG_IPV6_MIP6) 859 case IPV6_SRCRT_TYPE_2: 860 if (rthdr->hdrlen != 2 || 861 rthdr->segments_left != 1) { 862 err = -EINVAL; 863 goto exit_f; 864 } 865 break; 866 #endif 867 default: 868 err = -EINVAL; 869 goto exit_f; 870 } 871 872 len = ((rthdr->hdrlen + 1) << 3); 873 874 if (cmsg->cmsg_len < CMSG_LEN(len)) { 875 err = -EINVAL; 876 goto exit_f; 877 } 878 879 /* segments left must also match */ 880 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 881 err = -EINVAL; 882 goto exit_f; 883 } 884 885 opt->opt_nflen += len; 886 opt->srcrt = rthdr; 887 888 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 889 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 890 891 opt->opt_nflen += dsthdrlen; 892 opt->dst0opt = opt->dst1opt; 893 opt->dst1opt = NULL; 894 opt->opt_flen -= dsthdrlen; 895 } 896 897 break; 898 899 case IPV6_2292HOPLIMIT: 900 case IPV6_HOPLIMIT: 901 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 902 err = -EINVAL; 903 goto exit_f; 904 } 905 906 *hlimit = *(int *)CMSG_DATA(cmsg); 907 if (*hlimit < -1 || *hlimit > 0xff) { 908 err = -EINVAL; 909 goto exit_f; 910 } 911 912 break; 913 914 case IPV6_TCLASS: 915 { 916 int tc; 917 918 err = -EINVAL; 919 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 920 goto exit_f; 921 922 tc = *(int *)CMSG_DATA(cmsg); 923 if (tc < -1 || tc > 0xff) 924 goto exit_f; 925 926 err = 0; 927 *tclass = tc; 928 929 break; 930 } 931 932 case IPV6_DONTFRAG: 933 { 934 int df; 935 936 err = -EINVAL; 937 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 938 goto exit_f; 939 940 df = *(int *)CMSG_DATA(cmsg); 941 if (df < 0 || df > 1) 942 goto exit_f; 943 944 err = 0; 945 *dontfrag = df; 946 947 break; 948 } 949 default: 950 net_dbg_ratelimited("invalid cmsg type: %d\n", 951 cmsg->cmsg_type); 952 err = -EINVAL; 953 goto exit_f; 954 } 955 } 956 957 exit_f: 958 return err; 959 } 960 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 961 962 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 963 __u16 srcp, __u16 destp, int bucket) 964 { 965 const struct in6_addr *dest, *src; 966 967 dest = &sp->sk_v6_daddr; 968 src = &sp->sk_v6_rcv_saddr; 969 seq_printf(seq, 970 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 971 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 972 bucket, 973 src->s6_addr32[0], src->s6_addr32[1], 974 src->s6_addr32[2], src->s6_addr32[3], srcp, 975 dest->s6_addr32[0], dest->s6_addr32[1], 976 dest->s6_addr32[2], dest->s6_addr32[3], destp, 977 sp->sk_state, 978 sk_wmem_alloc_get(sp), 979 sk_rmem_alloc_get(sp), 980 0, 0L, 0, 981 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 982 0, 983 sock_i_ino(sp), 984 atomic_read(&sp->sk_refcnt), sp, 985 atomic_read(&sp->sk_drops)); 986 } 987