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 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 == NULL) 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 opt = flowlabel ? flowlabel->opt : np->opt; 171 final_p = fl6_update_dst(&fl6, opt, &final); 172 173 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 174 err = 0; 175 if (IS_ERR(dst)) { 176 err = PTR_ERR(dst); 177 goto out; 178 } 179 180 /* source address lookup done in ip6_dst_lookup */ 181 182 if (ipv6_addr_any(&np->saddr)) 183 np->saddr = fl6.saddr; 184 185 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 186 sk->sk_v6_rcv_saddr = fl6.saddr; 187 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 188 if (sk->sk_prot->rehash) 189 sk->sk_prot->rehash(sk); 190 } 191 192 ip6_dst_store(sk, dst, 193 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 194 &sk->sk_v6_daddr : NULL, 195 #ifdef CONFIG_IPV6_SUBTREES 196 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 197 &np->saddr : 198 #endif 199 NULL); 200 201 sk->sk_state = TCP_ESTABLISHED; 202 ip6_set_txhash(sk); 203 out: 204 fl6_sock_release(flowlabel); 205 return err; 206 } 207 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 208 209 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 210 int addr_len) 211 { 212 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 213 if (sin6->sin6_family != AF_INET6) 214 return -EAFNOSUPPORT; 215 return ip6_datagram_connect(sk, uaddr, addr_len); 216 } 217 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 218 219 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 220 __be16 port, u32 info, u8 *payload) 221 { 222 struct ipv6_pinfo *np = inet6_sk(sk); 223 struct icmp6hdr *icmph = icmp6_hdr(skb); 224 struct sock_exterr_skb *serr; 225 226 if (!np->recverr) 227 return; 228 229 skb = skb_clone(skb, GFP_ATOMIC); 230 if (!skb) 231 return; 232 233 skb->protocol = htons(ETH_P_IPV6); 234 235 serr = SKB_EXT_ERR(skb); 236 serr->ee.ee_errno = err; 237 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 238 serr->ee.ee_type = icmph->icmp6_type; 239 serr->ee.ee_code = icmph->icmp6_code; 240 serr->ee.ee_pad = 0; 241 serr->ee.ee_info = info; 242 serr->ee.ee_data = 0; 243 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 244 skb_network_header(skb); 245 serr->port = port; 246 247 __skb_pull(skb, payload - skb->data); 248 skb_reset_transport_header(skb); 249 250 if (sock_queue_err_skb(sk, skb)) 251 kfree_skb(skb); 252 } 253 254 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 255 { 256 struct ipv6_pinfo *np = inet6_sk(sk); 257 struct sock_exterr_skb *serr; 258 struct ipv6hdr *iph; 259 struct sk_buff *skb; 260 261 if (!np->recverr) 262 return; 263 264 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 265 if (!skb) 266 return; 267 268 skb->protocol = htons(ETH_P_IPV6); 269 270 skb_put(skb, sizeof(struct ipv6hdr)); 271 skb_reset_network_header(skb); 272 iph = ipv6_hdr(skb); 273 iph->daddr = fl6->daddr; 274 275 serr = SKB_EXT_ERR(skb); 276 serr->ee.ee_errno = err; 277 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 278 serr->ee.ee_type = 0; 279 serr->ee.ee_code = 0; 280 serr->ee.ee_pad = 0; 281 serr->ee.ee_info = info; 282 serr->ee.ee_data = 0; 283 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 284 serr->port = fl6->fl6_dport; 285 286 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 287 skb_reset_transport_header(skb); 288 289 if (sock_queue_err_skb(sk, skb)) 290 kfree_skb(skb); 291 } 292 293 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 294 { 295 struct ipv6_pinfo *np = inet6_sk(sk); 296 struct ipv6hdr *iph; 297 struct sk_buff *skb; 298 struct ip6_mtuinfo *mtu_info; 299 300 if (!np->rxopt.bits.rxpmtu) 301 return; 302 303 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 304 if (!skb) 305 return; 306 307 skb_put(skb, sizeof(struct ipv6hdr)); 308 skb_reset_network_header(skb); 309 iph = ipv6_hdr(skb); 310 iph->daddr = fl6->daddr; 311 312 mtu_info = IP6CBMTU(skb); 313 314 mtu_info->ip6m_mtu = mtu; 315 mtu_info->ip6m_addr.sin6_family = AF_INET6; 316 mtu_info->ip6m_addr.sin6_port = 0; 317 mtu_info->ip6m_addr.sin6_flowinfo = 0; 318 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 319 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 320 321 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 322 skb_reset_transport_header(skb); 323 324 skb = xchg(&np->rxpmtu, skb); 325 kfree_skb(skb); 326 } 327 328 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 329 * 330 * At one point, excluding local errors was a quick test to identify icmp/icmp6 331 * errors. This is no longer true, but the test remained, so the v6 stack, 332 * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 333 * 334 * Timestamp code paths do not initialize the fields expected by cmsg: 335 * the PKTINFO fields in skb->cb[]. Fill those in here. 336 */ 337 static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 338 struct sock_exterr_skb *serr) 339 { 340 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 341 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 342 return true; 343 344 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 345 return false; 346 347 if (!skb->dev) 348 return false; 349 350 if (skb->protocol == htons(ETH_P_IPV6)) 351 IP6CB(skb)->iif = skb->dev->ifindex; 352 else 353 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 354 355 return true; 356 } 357 358 /* 359 * Handle MSG_ERRQUEUE 360 */ 361 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 362 { 363 struct ipv6_pinfo *np = inet6_sk(sk); 364 struct sock_exterr_skb *serr; 365 struct sk_buff *skb; 366 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 367 struct { 368 struct sock_extended_err ee; 369 struct sockaddr_in6 offender; 370 } errhdr; 371 int err; 372 int copied; 373 374 err = -EAGAIN; 375 skb = sock_dequeue_err_skb(sk); 376 if (skb == NULL) 377 goto out; 378 379 copied = skb->len; 380 if (copied > len) { 381 msg->msg_flags |= MSG_TRUNC; 382 copied = len; 383 } 384 err = skb_copy_datagram_msg(skb, 0, msg, copied); 385 if (err) 386 goto out_free_skb; 387 388 sock_recv_timestamp(msg, sk, skb); 389 390 serr = SKB_EXT_ERR(skb); 391 392 if (sin && serr->port) { 393 const unsigned char *nh = skb_network_header(skb); 394 sin->sin6_family = AF_INET6; 395 sin->sin6_flowinfo = 0; 396 sin->sin6_port = serr->port; 397 if (skb->protocol == htons(ETH_P_IPV6)) { 398 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 399 struct ipv6hdr, daddr); 400 sin->sin6_addr = ip6h->daddr; 401 if (np->sndflow) 402 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 403 sin->sin6_scope_id = 404 ipv6_iface_scope_id(&sin->sin6_addr, 405 IP6CB(skb)->iif); 406 } else { 407 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 408 &sin->sin6_addr); 409 sin->sin6_scope_id = 0; 410 } 411 *addr_len = sizeof(*sin); 412 } 413 414 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 415 sin = &errhdr.offender; 416 memset(sin, 0, sizeof(*sin)); 417 418 if (ip6_datagram_support_cmsg(skb, serr)) { 419 sin->sin6_family = AF_INET6; 420 if (np->rxopt.all) 421 ip6_datagram_recv_common_ctl(sk, msg, skb); 422 if (skb->protocol == htons(ETH_P_IPV6)) { 423 sin->sin6_addr = ipv6_hdr(skb)->saddr; 424 if (np->rxopt.all) 425 ip6_datagram_recv_specific_ctl(sk, msg, skb); 426 sin->sin6_scope_id = 427 ipv6_iface_scope_id(&sin->sin6_addr, 428 IP6CB(skb)->iif); 429 } else { 430 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 431 &sin->sin6_addr); 432 if (inet_sk(sk)->cmsg_flags) 433 ip_cmsg_recv(msg, skb); 434 } 435 } 436 437 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 438 439 /* Now we could try to dump offended packet options */ 440 441 msg->msg_flags |= MSG_ERRQUEUE; 442 err = copied; 443 444 out_free_skb: 445 kfree_skb(skb); 446 out: 447 return err; 448 } 449 EXPORT_SYMBOL_GPL(ipv6_recv_error); 450 451 /* 452 * Handle IPV6_RECVPATHMTU 453 */ 454 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 455 int *addr_len) 456 { 457 struct ipv6_pinfo *np = inet6_sk(sk); 458 struct sk_buff *skb; 459 struct ip6_mtuinfo mtu_info; 460 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 461 int err; 462 int copied; 463 464 err = -EAGAIN; 465 skb = xchg(&np->rxpmtu, NULL); 466 if (skb == NULL) 467 goto out; 468 469 copied = skb->len; 470 if (copied > len) { 471 msg->msg_flags |= MSG_TRUNC; 472 copied = len; 473 } 474 err = skb_copy_datagram_msg(skb, 0, msg, copied); 475 if (err) 476 goto out_free_skb; 477 478 sock_recv_timestamp(msg, sk, skb); 479 480 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 481 482 if (sin) { 483 sin->sin6_family = AF_INET6; 484 sin->sin6_flowinfo = 0; 485 sin->sin6_port = 0; 486 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 487 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 488 *addr_len = sizeof(*sin); 489 } 490 491 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 492 493 err = copied; 494 495 out_free_skb: 496 kfree_skb(skb); 497 out: 498 return err; 499 } 500 501 502 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 503 struct sk_buff *skb) 504 { 505 struct ipv6_pinfo *np = inet6_sk(sk); 506 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 507 508 if (np->rxopt.bits.rxinfo) { 509 struct in6_pktinfo src_info; 510 511 if (is_ipv6) { 512 src_info.ipi6_ifindex = IP6CB(skb)->iif; 513 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 514 } else { 515 src_info.ipi6_ifindex = 516 PKTINFO_SKB_CB(skb)->ipi_ifindex; 517 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 518 &src_info.ipi6_addr); 519 } 520 521 if (src_info.ipi6_ifindex >= 0) 522 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 523 sizeof(src_info), &src_info); 524 } 525 } 526 527 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 528 struct sk_buff *skb) 529 { 530 struct ipv6_pinfo *np = inet6_sk(sk); 531 struct inet6_skb_parm *opt = IP6CB(skb); 532 unsigned char *nh = skb_network_header(skb); 533 534 if (np->rxopt.bits.rxhlim) { 535 int hlim = ipv6_hdr(skb)->hop_limit; 536 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 537 } 538 539 if (np->rxopt.bits.rxtclass) { 540 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 541 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 542 } 543 544 if (np->rxopt.bits.rxflow) { 545 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 546 if (flowinfo) 547 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 548 } 549 550 /* HbH is allowed only once */ 551 if (np->rxopt.bits.hopopts && opt->hop) { 552 u8 *ptr = nh + opt->hop; 553 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 554 } 555 556 if (opt->lastopt && 557 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 558 /* 559 * Silly enough, but we need to reparse in order to 560 * report extension headers (except for HbH) 561 * in order. 562 * 563 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 564 * (and WILL NOT be) defined because 565 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 566 */ 567 unsigned int off = sizeof(struct ipv6hdr); 568 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 569 570 while (off <= opt->lastopt) { 571 unsigned int len; 572 u8 *ptr = nh + off; 573 574 switch (nexthdr) { 575 case IPPROTO_DSTOPTS: 576 nexthdr = ptr[0]; 577 len = (ptr[1] + 1) << 3; 578 if (np->rxopt.bits.dstopts) 579 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 580 break; 581 case IPPROTO_ROUTING: 582 nexthdr = ptr[0]; 583 len = (ptr[1] + 1) << 3; 584 if (np->rxopt.bits.srcrt) 585 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 586 break; 587 case IPPROTO_AH: 588 nexthdr = ptr[0]; 589 len = (ptr[1] + 2) << 2; 590 break; 591 default: 592 nexthdr = ptr[0]; 593 len = (ptr[1] + 1) << 3; 594 break; 595 } 596 597 off += len; 598 } 599 } 600 601 /* socket options in old style */ 602 if (np->rxopt.bits.rxoinfo) { 603 struct in6_pktinfo src_info; 604 605 src_info.ipi6_ifindex = opt->iif; 606 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 607 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 608 } 609 if (np->rxopt.bits.rxohlim) { 610 int hlim = ipv6_hdr(skb)->hop_limit; 611 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 612 } 613 if (np->rxopt.bits.ohopopts && opt->hop) { 614 u8 *ptr = nh + opt->hop; 615 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 616 } 617 if (np->rxopt.bits.odstopts && opt->dst0) { 618 u8 *ptr = nh + opt->dst0; 619 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 620 } 621 if (np->rxopt.bits.osrcrt && opt->srcrt) { 622 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 623 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 624 } 625 if (np->rxopt.bits.odstopts && opt->dst1) { 626 u8 *ptr = nh + opt->dst1; 627 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 628 } 629 if (np->rxopt.bits.rxorigdstaddr) { 630 struct sockaddr_in6 sin6; 631 __be16 *ports = (__be16 *) skb_transport_header(skb); 632 633 if (skb_transport_offset(skb) + 4 <= skb->len) { 634 /* All current transport protocols have the port numbers in the 635 * first four bytes of the transport header and this function is 636 * written with this assumption in mind. 637 */ 638 639 sin6.sin6_family = AF_INET6; 640 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 641 sin6.sin6_port = ports[1]; 642 sin6.sin6_flowinfo = 0; 643 sin6.sin6_scope_id = 644 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 645 opt->iif); 646 647 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 648 } 649 } 650 } 651 652 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 653 struct sk_buff *skb) 654 { 655 ip6_datagram_recv_common_ctl(sk, msg, skb); 656 ip6_datagram_recv_specific_ctl(sk, msg, skb); 657 } 658 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 659 660 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 661 struct msghdr *msg, struct flowi6 *fl6, 662 struct ipv6_txoptions *opt, 663 int *hlimit, int *tclass, int *dontfrag) 664 { 665 struct in6_pktinfo *src_info; 666 struct cmsghdr *cmsg; 667 struct ipv6_rt_hdr *rthdr; 668 struct ipv6_opt_hdr *hdr; 669 int len; 670 int err = 0; 671 672 for_each_cmsghdr(cmsg, msg) { 673 int addr_type; 674 675 if (!CMSG_OK(msg, cmsg)) { 676 err = -EINVAL; 677 goto exit_f; 678 } 679 680 if (cmsg->cmsg_level != SOL_IPV6) 681 continue; 682 683 switch (cmsg->cmsg_type) { 684 case IPV6_PKTINFO: 685 case IPV6_2292PKTINFO: 686 { 687 struct net_device *dev = NULL; 688 689 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 690 err = -EINVAL; 691 goto exit_f; 692 } 693 694 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 695 696 if (src_info->ipi6_ifindex) { 697 if (fl6->flowi6_oif && 698 src_info->ipi6_ifindex != fl6->flowi6_oif) 699 return -EINVAL; 700 fl6->flowi6_oif = src_info->ipi6_ifindex; 701 } 702 703 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 704 705 rcu_read_lock(); 706 if (fl6->flowi6_oif) { 707 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 708 if (!dev) { 709 rcu_read_unlock(); 710 return -ENODEV; 711 } 712 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 713 rcu_read_unlock(); 714 return -EINVAL; 715 } 716 717 if (addr_type != IPV6_ADDR_ANY) { 718 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 719 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 720 !ipv6_chk_addr(net, &src_info->ipi6_addr, 721 strict ? dev : NULL, 0) && 722 !ipv6_chk_acast_addr_src(net, dev, 723 &src_info->ipi6_addr)) 724 err = -EINVAL; 725 else 726 fl6->saddr = src_info->ipi6_addr; 727 } 728 729 rcu_read_unlock(); 730 731 if (err) 732 goto exit_f; 733 734 break; 735 } 736 737 case IPV6_FLOWINFO: 738 if (cmsg->cmsg_len < CMSG_LEN(4)) { 739 err = -EINVAL; 740 goto exit_f; 741 } 742 743 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 744 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 745 err = -EINVAL; 746 goto exit_f; 747 } 748 } 749 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 750 break; 751 752 case IPV6_2292HOPOPTS: 753 case IPV6_HOPOPTS: 754 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 755 err = -EINVAL; 756 goto exit_f; 757 } 758 759 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 760 len = ((hdr->hdrlen + 1) << 3); 761 if (cmsg->cmsg_len < CMSG_LEN(len)) { 762 err = -EINVAL; 763 goto exit_f; 764 } 765 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 766 err = -EPERM; 767 goto exit_f; 768 } 769 opt->opt_nflen += len; 770 opt->hopopt = hdr; 771 break; 772 773 case IPV6_2292DSTOPTS: 774 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 775 err = -EINVAL; 776 goto exit_f; 777 } 778 779 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 780 len = ((hdr->hdrlen + 1) << 3); 781 if (cmsg->cmsg_len < CMSG_LEN(len)) { 782 err = -EINVAL; 783 goto exit_f; 784 } 785 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 786 err = -EPERM; 787 goto exit_f; 788 } 789 if (opt->dst1opt) { 790 err = -EINVAL; 791 goto exit_f; 792 } 793 opt->opt_flen += len; 794 opt->dst1opt = hdr; 795 break; 796 797 case IPV6_DSTOPTS: 798 case IPV6_RTHDRDSTOPTS: 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 (cmsg->cmsg_type == IPV6_DSTOPTS) { 815 opt->opt_flen += len; 816 opt->dst1opt = hdr; 817 } else { 818 opt->opt_nflen += len; 819 opt->dst0opt = hdr; 820 } 821 break; 822 823 case IPV6_2292RTHDR: 824 case IPV6_RTHDR: 825 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 826 err = -EINVAL; 827 goto exit_f; 828 } 829 830 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 831 832 switch (rthdr->type) { 833 #if IS_ENABLED(CONFIG_IPV6_MIP6) 834 case IPV6_SRCRT_TYPE_2: 835 if (rthdr->hdrlen != 2 || 836 rthdr->segments_left != 1) { 837 err = -EINVAL; 838 goto exit_f; 839 } 840 break; 841 #endif 842 default: 843 err = -EINVAL; 844 goto exit_f; 845 } 846 847 len = ((rthdr->hdrlen + 1) << 3); 848 849 if (cmsg->cmsg_len < CMSG_LEN(len)) { 850 err = -EINVAL; 851 goto exit_f; 852 } 853 854 /* segments left must also match */ 855 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 856 err = -EINVAL; 857 goto exit_f; 858 } 859 860 opt->opt_nflen += len; 861 opt->srcrt = rthdr; 862 863 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 864 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 865 866 opt->opt_nflen += dsthdrlen; 867 opt->dst0opt = opt->dst1opt; 868 opt->dst1opt = NULL; 869 opt->opt_flen -= dsthdrlen; 870 } 871 872 break; 873 874 case IPV6_2292HOPLIMIT: 875 case IPV6_HOPLIMIT: 876 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 877 err = -EINVAL; 878 goto exit_f; 879 } 880 881 *hlimit = *(int *)CMSG_DATA(cmsg); 882 if (*hlimit < -1 || *hlimit > 0xff) { 883 err = -EINVAL; 884 goto exit_f; 885 } 886 887 break; 888 889 case IPV6_TCLASS: 890 { 891 int tc; 892 893 err = -EINVAL; 894 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 895 goto exit_f; 896 897 tc = *(int *)CMSG_DATA(cmsg); 898 if (tc < -1 || tc > 0xff) 899 goto exit_f; 900 901 err = 0; 902 *tclass = tc; 903 904 break; 905 } 906 907 case IPV6_DONTFRAG: 908 { 909 int df; 910 911 err = -EINVAL; 912 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 913 goto exit_f; 914 915 df = *(int *)CMSG_DATA(cmsg); 916 if (df < 0 || df > 1) 917 goto exit_f; 918 919 err = 0; 920 *dontfrag = df; 921 922 break; 923 } 924 default: 925 net_dbg_ratelimited("invalid cmsg type: %d\n", 926 cmsg->cmsg_type); 927 err = -EINVAL; 928 goto exit_f; 929 } 930 } 931 932 exit_f: 933 return err; 934 } 935 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 936 937 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 938 __u16 srcp, __u16 destp, int bucket) 939 { 940 const struct in6_addr *dest, *src; 941 942 dest = &sp->sk_v6_daddr; 943 src = &sp->sk_v6_rcv_saddr; 944 seq_printf(seq, 945 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 946 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 947 bucket, 948 src->s6_addr32[0], src->s6_addr32[1], 949 src->s6_addr32[2], src->s6_addr32[3], srcp, 950 dest->s6_addr32[0], dest->s6_addr32[1], 951 dest->s6_addr32[2], dest->s6_addr32[3], destp, 952 sp->sk_state, 953 sk_wmem_alloc_get(sp), 954 sk_rmem_alloc_get(sp), 955 0, 0L, 0, 956 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 957 0, 958 sock_i_ino(sp), 959 atomic_read(&sp->sk_refcnt), sp, 960 atomic_read(&sp->sk_drops)); 961 } 962