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