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