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