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 out: 203 fl6_sock_release(flowlabel); 204 return err; 205 } 206 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 207 208 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 209 int addr_len) 210 { 211 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 212 if (sin6->sin6_family != AF_INET6) 213 return -EAFNOSUPPORT; 214 return ip6_datagram_connect(sk, uaddr, addr_len); 215 } 216 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 217 218 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 219 __be16 port, u32 info, u8 *payload) 220 { 221 struct ipv6_pinfo *np = inet6_sk(sk); 222 struct icmp6hdr *icmph = icmp6_hdr(skb); 223 struct sock_exterr_skb *serr; 224 225 if (!np->recverr) 226 return; 227 228 skb = skb_clone(skb, GFP_ATOMIC); 229 if (!skb) 230 return; 231 232 skb->protocol = htons(ETH_P_IPV6); 233 234 serr = SKB_EXT_ERR(skb); 235 serr->ee.ee_errno = err; 236 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 237 serr->ee.ee_type = icmph->icmp6_type; 238 serr->ee.ee_code = icmph->icmp6_code; 239 serr->ee.ee_pad = 0; 240 serr->ee.ee_info = info; 241 serr->ee.ee_data = 0; 242 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 243 skb_network_header(skb); 244 serr->port = port; 245 246 __skb_pull(skb, payload - skb->data); 247 skb_reset_transport_header(skb); 248 249 if (sock_queue_err_skb(sk, skb)) 250 kfree_skb(skb); 251 } 252 253 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 254 { 255 struct ipv6_pinfo *np = inet6_sk(sk); 256 struct sock_exterr_skb *serr; 257 struct ipv6hdr *iph; 258 struct sk_buff *skb; 259 260 if (!np->recverr) 261 return; 262 263 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 264 if (!skb) 265 return; 266 267 skb->protocol = htons(ETH_P_IPV6); 268 269 skb_put(skb, sizeof(struct ipv6hdr)); 270 skb_reset_network_header(skb); 271 iph = ipv6_hdr(skb); 272 iph->daddr = fl6->daddr; 273 274 serr = SKB_EXT_ERR(skb); 275 serr->ee.ee_errno = err; 276 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 277 serr->ee.ee_type = 0; 278 serr->ee.ee_code = 0; 279 serr->ee.ee_pad = 0; 280 serr->ee.ee_info = info; 281 serr->ee.ee_data = 0; 282 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 283 serr->port = fl6->fl6_dport; 284 285 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 286 skb_reset_transport_header(skb); 287 288 if (sock_queue_err_skb(sk, skb)) 289 kfree_skb(skb); 290 } 291 292 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 293 { 294 struct ipv6_pinfo *np = inet6_sk(sk); 295 struct ipv6hdr *iph; 296 struct sk_buff *skb; 297 struct ip6_mtuinfo *mtu_info; 298 299 if (!np->rxopt.bits.rxpmtu) 300 return; 301 302 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 303 if (!skb) 304 return; 305 306 skb_put(skb, sizeof(struct ipv6hdr)); 307 skb_reset_network_header(skb); 308 iph = ipv6_hdr(skb); 309 iph->daddr = fl6->daddr; 310 311 mtu_info = IP6CBMTU(skb); 312 313 mtu_info->ip6m_mtu = mtu; 314 mtu_info->ip6m_addr.sin6_family = AF_INET6; 315 mtu_info->ip6m_addr.sin6_port = 0; 316 mtu_info->ip6m_addr.sin6_flowinfo = 0; 317 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 318 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 319 320 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 321 skb_reset_transport_header(skb); 322 323 skb = xchg(&np->rxpmtu, skb); 324 kfree_skb(skb); 325 } 326 327 /* 328 * Handle MSG_ERRQUEUE 329 */ 330 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 331 { 332 struct ipv6_pinfo *np = inet6_sk(sk); 333 struct sock_exterr_skb *serr; 334 struct sk_buff *skb, *skb2; 335 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 336 struct { 337 struct sock_extended_err ee; 338 struct sockaddr_in6 offender; 339 } errhdr; 340 int err; 341 int copied; 342 343 err = -EAGAIN; 344 skb = skb_dequeue(&sk->sk_error_queue); 345 if (skb == NULL) 346 goto out; 347 348 copied = skb->len; 349 if (copied > len) { 350 msg->msg_flags |= MSG_TRUNC; 351 copied = len; 352 } 353 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 354 if (err) 355 goto out_free_skb; 356 357 sock_recv_timestamp(msg, sk, skb); 358 359 serr = SKB_EXT_ERR(skb); 360 361 if (sin) { 362 const unsigned char *nh = skb_network_header(skb); 363 sin->sin6_family = AF_INET6; 364 sin->sin6_flowinfo = 0; 365 sin->sin6_port = serr->port; 366 if (skb->protocol == htons(ETH_P_IPV6)) { 367 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 368 struct ipv6hdr, daddr); 369 sin->sin6_addr = ip6h->daddr; 370 if (np->sndflow) 371 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 372 sin->sin6_scope_id = 373 ipv6_iface_scope_id(&sin->sin6_addr, 374 IP6CB(skb)->iif); 375 } else { 376 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 377 &sin->sin6_addr); 378 sin->sin6_scope_id = 0; 379 } 380 *addr_len = sizeof(*sin); 381 } 382 383 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 384 sin = &errhdr.offender; 385 sin->sin6_family = AF_UNSPEC; 386 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 387 sin->sin6_family = AF_INET6; 388 sin->sin6_flowinfo = 0; 389 sin->sin6_port = 0; 390 if (np->rxopt.all) 391 ip6_datagram_recv_common_ctl(sk, msg, skb); 392 if (skb->protocol == htons(ETH_P_IPV6)) { 393 sin->sin6_addr = ipv6_hdr(skb)->saddr; 394 if (np->rxopt.all) 395 ip6_datagram_recv_specific_ctl(sk, msg, skb); 396 sin->sin6_scope_id = 397 ipv6_iface_scope_id(&sin->sin6_addr, 398 IP6CB(skb)->iif); 399 } else { 400 struct inet_sock *inet = inet_sk(sk); 401 402 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 403 &sin->sin6_addr); 404 sin->sin6_scope_id = 0; 405 if (inet->cmsg_flags) 406 ip_cmsg_recv(msg, skb); 407 } 408 } 409 410 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 411 412 /* Now we could try to dump offended packet options */ 413 414 msg->msg_flags |= MSG_ERRQUEUE; 415 err = copied; 416 417 /* Reset and regenerate socket error */ 418 spin_lock_bh(&sk->sk_error_queue.lock); 419 sk->sk_err = 0; 420 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 421 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 422 spin_unlock_bh(&sk->sk_error_queue.lock); 423 sk->sk_error_report(sk); 424 } else { 425 spin_unlock_bh(&sk->sk_error_queue.lock); 426 } 427 428 out_free_skb: 429 kfree_skb(skb); 430 out: 431 return err; 432 } 433 EXPORT_SYMBOL_GPL(ipv6_recv_error); 434 435 /* 436 * Handle IPV6_RECVPATHMTU 437 */ 438 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 439 int *addr_len) 440 { 441 struct ipv6_pinfo *np = inet6_sk(sk); 442 struct sk_buff *skb; 443 struct ip6_mtuinfo mtu_info; 444 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 445 int err; 446 int copied; 447 448 err = -EAGAIN; 449 skb = xchg(&np->rxpmtu, NULL); 450 if (skb == NULL) 451 goto out; 452 453 copied = skb->len; 454 if (copied > len) { 455 msg->msg_flags |= MSG_TRUNC; 456 copied = len; 457 } 458 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 459 if (err) 460 goto out_free_skb; 461 462 sock_recv_timestamp(msg, sk, skb); 463 464 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 465 466 if (sin) { 467 sin->sin6_family = AF_INET6; 468 sin->sin6_flowinfo = 0; 469 sin->sin6_port = 0; 470 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 471 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 472 *addr_len = sizeof(*sin); 473 } 474 475 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 476 477 err = copied; 478 479 out_free_skb: 480 kfree_skb(skb); 481 out: 482 return err; 483 } 484 485 486 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 487 struct sk_buff *skb) 488 { 489 struct ipv6_pinfo *np = inet6_sk(sk); 490 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 491 492 if (np->rxopt.bits.rxinfo) { 493 struct in6_pktinfo src_info; 494 495 if (is_ipv6) { 496 src_info.ipi6_ifindex = IP6CB(skb)->iif; 497 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 498 } else { 499 src_info.ipi6_ifindex = 500 PKTINFO_SKB_CB(skb)->ipi_ifindex; 501 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 502 &src_info.ipi6_addr); 503 } 504 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 505 } 506 } 507 508 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 509 struct sk_buff *skb) 510 { 511 struct ipv6_pinfo *np = inet6_sk(sk); 512 struct inet6_skb_parm *opt = IP6CB(skb); 513 unsigned char *nh = skb_network_header(skb); 514 515 if (np->rxopt.bits.rxhlim) { 516 int hlim = ipv6_hdr(skb)->hop_limit; 517 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 518 } 519 520 if (np->rxopt.bits.rxtclass) { 521 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 522 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 523 } 524 525 if (np->rxopt.bits.rxflow) { 526 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 527 if (flowinfo) 528 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 529 } 530 531 /* HbH is allowed only once */ 532 if (np->rxopt.bits.hopopts && opt->hop) { 533 u8 *ptr = nh + opt->hop; 534 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 535 } 536 537 if (opt->lastopt && 538 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 539 /* 540 * Silly enough, but we need to reparse in order to 541 * report extension headers (except for HbH) 542 * in order. 543 * 544 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 545 * (and WILL NOT be) defined because 546 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 547 */ 548 unsigned int off = sizeof(struct ipv6hdr); 549 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 550 551 while (off <= opt->lastopt) { 552 unsigned int len; 553 u8 *ptr = nh + off; 554 555 switch (nexthdr) { 556 case IPPROTO_DSTOPTS: 557 nexthdr = ptr[0]; 558 len = (ptr[1] + 1) << 3; 559 if (np->rxopt.bits.dstopts) 560 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 561 break; 562 case IPPROTO_ROUTING: 563 nexthdr = ptr[0]; 564 len = (ptr[1] + 1) << 3; 565 if (np->rxopt.bits.srcrt) 566 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 567 break; 568 case IPPROTO_AH: 569 nexthdr = ptr[0]; 570 len = (ptr[1] + 2) << 2; 571 break; 572 default: 573 nexthdr = ptr[0]; 574 len = (ptr[1] + 1) << 3; 575 break; 576 } 577 578 off += len; 579 } 580 } 581 582 /* socket options in old style */ 583 if (np->rxopt.bits.rxoinfo) { 584 struct in6_pktinfo src_info; 585 586 src_info.ipi6_ifindex = opt->iif; 587 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 588 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 589 } 590 if (np->rxopt.bits.rxohlim) { 591 int hlim = ipv6_hdr(skb)->hop_limit; 592 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 593 } 594 if (np->rxopt.bits.ohopopts && opt->hop) { 595 u8 *ptr = nh + opt->hop; 596 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 597 } 598 if (np->rxopt.bits.odstopts && opt->dst0) { 599 u8 *ptr = nh + opt->dst0; 600 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 601 } 602 if (np->rxopt.bits.osrcrt && opt->srcrt) { 603 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 604 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 605 } 606 if (np->rxopt.bits.odstopts && opt->dst1) { 607 u8 *ptr = nh + opt->dst1; 608 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 609 } 610 if (np->rxopt.bits.rxorigdstaddr) { 611 struct sockaddr_in6 sin6; 612 __be16 *ports = (__be16 *) skb_transport_header(skb); 613 614 if (skb_transport_offset(skb) + 4 <= skb->len) { 615 /* All current transport protocols have the port numbers in the 616 * first four bytes of the transport header and this function is 617 * written with this assumption in mind. 618 */ 619 620 sin6.sin6_family = AF_INET6; 621 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 622 sin6.sin6_port = ports[1]; 623 sin6.sin6_flowinfo = 0; 624 sin6.sin6_scope_id = 625 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 626 opt->iif); 627 628 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 629 } 630 } 631 } 632 633 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 634 struct sk_buff *skb) 635 { 636 ip6_datagram_recv_common_ctl(sk, msg, skb); 637 ip6_datagram_recv_specific_ctl(sk, msg, skb); 638 } 639 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 640 641 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 642 struct msghdr *msg, struct flowi6 *fl6, 643 struct ipv6_txoptions *opt, 644 int *hlimit, int *tclass, int *dontfrag) 645 { 646 struct in6_pktinfo *src_info; 647 struct cmsghdr *cmsg; 648 struct ipv6_rt_hdr *rthdr; 649 struct ipv6_opt_hdr *hdr; 650 int len; 651 int err = 0; 652 653 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 654 int addr_type; 655 656 if (!CMSG_OK(msg, cmsg)) { 657 err = -EINVAL; 658 goto exit_f; 659 } 660 661 if (cmsg->cmsg_level != SOL_IPV6) 662 continue; 663 664 switch (cmsg->cmsg_type) { 665 case IPV6_PKTINFO: 666 case IPV6_2292PKTINFO: 667 { 668 struct net_device *dev = NULL; 669 670 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 671 err = -EINVAL; 672 goto exit_f; 673 } 674 675 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 676 677 if (src_info->ipi6_ifindex) { 678 if (fl6->flowi6_oif && 679 src_info->ipi6_ifindex != fl6->flowi6_oif) 680 return -EINVAL; 681 fl6->flowi6_oif = src_info->ipi6_ifindex; 682 } 683 684 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 685 686 rcu_read_lock(); 687 if (fl6->flowi6_oif) { 688 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 689 if (!dev) { 690 rcu_read_unlock(); 691 return -ENODEV; 692 } 693 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 694 rcu_read_unlock(); 695 return -EINVAL; 696 } 697 698 if (addr_type != IPV6_ADDR_ANY) { 699 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 700 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 701 !ipv6_chk_addr(net, &src_info->ipi6_addr, 702 strict ? dev : NULL, 0) && 703 !ipv6_chk_acast_addr_src(net, dev, 704 &src_info->ipi6_addr)) 705 err = -EINVAL; 706 else 707 fl6->saddr = src_info->ipi6_addr; 708 } 709 710 rcu_read_unlock(); 711 712 if (err) 713 goto exit_f; 714 715 break; 716 } 717 718 case IPV6_FLOWINFO: 719 if (cmsg->cmsg_len < CMSG_LEN(4)) { 720 err = -EINVAL; 721 goto exit_f; 722 } 723 724 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 725 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 726 err = -EINVAL; 727 goto exit_f; 728 } 729 } 730 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 731 break; 732 733 case IPV6_2292HOPOPTS: 734 case IPV6_HOPOPTS: 735 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 736 err = -EINVAL; 737 goto exit_f; 738 } 739 740 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 741 len = ((hdr->hdrlen + 1) << 3); 742 if (cmsg->cmsg_len < CMSG_LEN(len)) { 743 err = -EINVAL; 744 goto exit_f; 745 } 746 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 747 err = -EPERM; 748 goto exit_f; 749 } 750 opt->opt_nflen += len; 751 opt->hopopt = hdr; 752 break; 753 754 case IPV6_2292DSTOPTS: 755 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 756 err = -EINVAL; 757 goto exit_f; 758 } 759 760 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 761 len = ((hdr->hdrlen + 1) << 3); 762 if (cmsg->cmsg_len < CMSG_LEN(len)) { 763 err = -EINVAL; 764 goto exit_f; 765 } 766 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 767 err = -EPERM; 768 goto exit_f; 769 } 770 if (opt->dst1opt) { 771 err = -EINVAL; 772 goto exit_f; 773 } 774 opt->opt_flen += len; 775 opt->dst1opt = hdr; 776 break; 777 778 case IPV6_DSTOPTS: 779 case IPV6_RTHDRDSTOPTS: 780 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 781 err = -EINVAL; 782 goto exit_f; 783 } 784 785 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 786 len = ((hdr->hdrlen + 1) << 3); 787 if (cmsg->cmsg_len < CMSG_LEN(len)) { 788 err = -EINVAL; 789 goto exit_f; 790 } 791 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 792 err = -EPERM; 793 goto exit_f; 794 } 795 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 796 opt->opt_flen += len; 797 opt->dst1opt = hdr; 798 } else { 799 opt->opt_nflen += len; 800 opt->dst0opt = hdr; 801 } 802 break; 803 804 case IPV6_2292RTHDR: 805 case IPV6_RTHDR: 806 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 807 err = -EINVAL; 808 goto exit_f; 809 } 810 811 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 812 813 switch (rthdr->type) { 814 #if IS_ENABLED(CONFIG_IPV6_MIP6) 815 case IPV6_SRCRT_TYPE_2: 816 if (rthdr->hdrlen != 2 || 817 rthdr->segments_left != 1) { 818 err = -EINVAL; 819 goto exit_f; 820 } 821 break; 822 #endif 823 default: 824 err = -EINVAL; 825 goto exit_f; 826 } 827 828 len = ((rthdr->hdrlen + 1) << 3); 829 830 if (cmsg->cmsg_len < CMSG_LEN(len)) { 831 err = -EINVAL; 832 goto exit_f; 833 } 834 835 /* segments left must also match */ 836 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 837 err = -EINVAL; 838 goto exit_f; 839 } 840 841 opt->opt_nflen += len; 842 opt->srcrt = rthdr; 843 844 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 845 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 846 847 opt->opt_nflen += dsthdrlen; 848 opt->dst0opt = opt->dst1opt; 849 opt->dst1opt = NULL; 850 opt->opt_flen -= dsthdrlen; 851 } 852 853 break; 854 855 case IPV6_2292HOPLIMIT: 856 case IPV6_HOPLIMIT: 857 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 858 err = -EINVAL; 859 goto exit_f; 860 } 861 862 *hlimit = *(int *)CMSG_DATA(cmsg); 863 if (*hlimit < -1 || *hlimit > 0xff) { 864 err = -EINVAL; 865 goto exit_f; 866 } 867 868 break; 869 870 case IPV6_TCLASS: 871 { 872 int tc; 873 874 err = -EINVAL; 875 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 876 goto exit_f; 877 878 tc = *(int *)CMSG_DATA(cmsg); 879 if (tc < -1 || tc > 0xff) 880 goto exit_f; 881 882 err = 0; 883 *tclass = tc; 884 885 break; 886 } 887 888 case IPV6_DONTFRAG: 889 { 890 int df; 891 892 err = -EINVAL; 893 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 894 goto exit_f; 895 896 df = *(int *)CMSG_DATA(cmsg); 897 if (df < 0 || df > 1) 898 goto exit_f; 899 900 err = 0; 901 *dontfrag = df; 902 903 break; 904 } 905 default: 906 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 907 cmsg->cmsg_type); 908 err = -EINVAL; 909 goto exit_f; 910 } 911 } 912 913 exit_f: 914 return err; 915 } 916 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 917 918 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 919 __u16 srcp, __u16 destp, int bucket) 920 { 921 const struct in6_addr *dest, *src; 922 923 dest = &sp->sk_v6_daddr; 924 src = &sp->sk_v6_rcv_saddr; 925 seq_printf(seq, 926 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 927 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 928 bucket, 929 src->s6_addr32[0], src->s6_addr32[1], 930 src->s6_addr32[2], src->s6_addr32[3], srcp, 931 dest->s6_addr32[0], dest->s6_addr32[1], 932 dest->s6_addr32[2], dest->s6_addr32[3], destp, 933 sp->sk_state, 934 sk_wmem_alloc_get(sp), 935 sk_rmem_alloc_get(sp), 936 0, 0L, 0, 937 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 938 0, 939 sock_i_ino(sp), 940 atomic_read(&sp->sk_refcnt), sp, 941 atomic_read(&sp->sk_drops)); 942 } 943