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 26 #include <net/ipv6.h> 27 #include <net/ndisc.h> 28 #include <net/addrconf.h> 29 #include <net/transp_v6.h> 30 #include <net/ip6_route.h> 31 #include <net/tcp_states.h> 32 33 #include <linux/errqueue.h> 34 #include <asm/uaccess.h> 35 36 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 37 { 38 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 39 struct inet_sock *inet = inet_sk(sk); 40 struct ipv6_pinfo *np = inet6_sk(sk); 41 struct in6_addr *daddr, *final_p, final; 42 struct dst_entry *dst; 43 struct flowi fl; 44 struct ip6_flowlabel *flowlabel = NULL; 45 struct ipv6_txoptions *opt; 46 int addr_type; 47 int err; 48 49 if (usin->sin6_family == AF_INET) { 50 if (__ipv6_only_sock(sk)) 51 return -EAFNOSUPPORT; 52 err = ip4_datagram_connect(sk, uaddr, addr_len); 53 goto ipv4_connected; 54 } 55 56 if (addr_len < SIN6_LEN_RFC2133) 57 return -EINVAL; 58 59 if (usin->sin6_family != AF_INET6) 60 return -EAFNOSUPPORT; 61 62 memset(&fl, 0, sizeof(fl)); 63 if (np->sndflow) { 64 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 65 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 66 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 67 if (flowlabel == NULL) 68 return -EINVAL; 69 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 70 } 71 } 72 73 addr_type = ipv6_addr_type(&usin->sin6_addr); 74 75 if (addr_type == IPV6_ADDR_ANY) { 76 /* 77 * connect to self 78 */ 79 usin->sin6_addr.s6_addr[15] = 0x01; 80 } 81 82 daddr = &usin->sin6_addr; 83 84 if (addr_type == IPV6_ADDR_MAPPED) { 85 struct sockaddr_in sin; 86 87 if (__ipv6_only_sock(sk)) { 88 err = -ENETUNREACH; 89 goto out; 90 } 91 sin.sin_family = AF_INET; 92 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 93 sin.sin_port = usin->sin6_port; 94 95 err = ip4_datagram_connect(sk, 96 (struct sockaddr*) &sin, 97 sizeof(sin)); 98 99 ipv4_connected: 100 if (err) 101 goto out; 102 103 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); 104 105 if (ipv6_addr_any(&np->saddr)) 106 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 107 108 if (ipv6_addr_any(&np->rcv_saddr)) { 109 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 110 &np->rcv_saddr); 111 if (sk->sk_prot->rehash) 112 sk->sk_prot->rehash(sk); 113 } 114 115 goto out; 116 } 117 118 if (addr_type&IPV6_ADDR_LINKLOCAL) { 119 if (addr_len >= sizeof(struct sockaddr_in6) && 120 usin->sin6_scope_id) { 121 if (sk->sk_bound_dev_if && 122 sk->sk_bound_dev_if != usin->sin6_scope_id) { 123 err = -EINVAL; 124 goto out; 125 } 126 sk->sk_bound_dev_if = usin->sin6_scope_id; 127 } 128 129 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 130 sk->sk_bound_dev_if = np->mcast_oif; 131 132 /* Connect to link-local address requires an interface */ 133 if (!sk->sk_bound_dev_if) { 134 err = -EINVAL; 135 goto out; 136 } 137 } 138 139 ipv6_addr_copy(&np->daddr, daddr); 140 np->flow_label = fl.fl6_flowlabel; 141 142 inet->inet_dport = usin->sin6_port; 143 144 /* 145 * Check for a route to destination an obtain the 146 * destination cache for it. 147 */ 148 149 fl.proto = sk->sk_protocol; 150 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 151 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 152 fl.oif = sk->sk_bound_dev_if; 153 fl.mark = sk->sk_mark; 154 fl.fl_ip_dport = inet->inet_dport; 155 fl.fl_ip_sport = inet->inet_sport; 156 157 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) 158 fl.oif = np->mcast_oif; 159 160 security_sk_classify_flow(sk, &fl); 161 162 opt = flowlabel ? flowlabel->opt : np->opt; 163 final_p = fl6_update_dst(&fl, opt, &final); 164 165 err = ip6_dst_lookup(sk, &dst, &fl); 166 if (err) 167 goto out; 168 if (final_p) 169 ipv6_addr_copy(&fl.fl6_dst, final_p); 170 171 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 172 if (err < 0) { 173 if (err == -EREMOTE) 174 err = ip6_dst_blackhole(sk, &dst, &fl); 175 if (err < 0) 176 goto out; 177 } 178 179 /* source address lookup done in ip6_dst_lookup */ 180 181 if (ipv6_addr_any(&np->saddr)) 182 ipv6_addr_copy(&np->saddr, &fl.fl6_src); 183 184 if (ipv6_addr_any(&np->rcv_saddr)) { 185 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); 186 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 187 if (sk->sk_prot->rehash) 188 sk->sk_prot->rehash(sk); 189 } 190 191 ip6_dst_store(sk, dst, 192 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 193 &np->daddr : NULL, 194 #ifdef CONFIG_IPV6_SUBTREES 195 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 196 &np->saddr : 197 #endif 198 NULL); 199 200 sk->sk_state = TCP_ESTABLISHED; 201 out: 202 fl6_sock_release(flowlabel); 203 return err; 204 } 205 206 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 207 __be16 port, u32 info, u8 *payload) 208 { 209 struct ipv6_pinfo *np = inet6_sk(sk); 210 struct icmp6hdr *icmph = icmp6_hdr(skb); 211 struct sock_exterr_skb *serr; 212 213 if (!np->recverr) 214 return; 215 216 skb = skb_clone(skb, GFP_ATOMIC); 217 if (!skb) 218 return; 219 220 skb->protocol = htons(ETH_P_IPV6); 221 222 serr = SKB_EXT_ERR(skb); 223 serr->ee.ee_errno = err; 224 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 225 serr->ee.ee_type = icmph->icmp6_type; 226 serr->ee.ee_code = icmph->icmp6_code; 227 serr->ee.ee_pad = 0; 228 serr->ee.ee_info = info; 229 serr->ee.ee_data = 0; 230 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 231 skb_network_header(skb); 232 serr->port = port; 233 234 __skb_pull(skb, payload - skb->data); 235 skb_reset_transport_header(skb); 236 237 if (sock_queue_err_skb(sk, skb)) 238 kfree_skb(skb); 239 } 240 241 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 242 { 243 struct ipv6_pinfo *np = inet6_sk(sk); 244 struct sock_exterr_skb *serr; 245 struct ipv6hdr *iph; 246 struct sk_buff *skb; 247 248 if (!np->recverr) 249 return; 250 251 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 252 if (!skb) 253 return; 254 255 skb->protocol = htons(ETH_P_IPV6); 256 257 skb_put(skb, sizeof(struct ipv6hdr)); 258 skb_reset_network_header(skb); 259 iph = ipv6_hdr(skb); 260 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 261 262 serr = SKB_EXT_ERR(skb); 263 serr->ee.ee_errno = err; 264 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 265 serr->ee.ee_type = 0; 266 serr->ee.ee_code = 0; 267 serr->ee.ee_pad = 0; 268 serr->ee.ee_info = info; 269 serr->ee.ee_data = 0; 270 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 271 serr->port = fl->fl_ip_dport; 272 273 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 274 skb_reset_transport_header(skb); 275 276 if (sock_queue_err_skb(sk, skb)) 277 kfree_skb(skb); 278 } 279 280 void ipv6_local_rxpmtu(struct sock *sk, struct flowi *fl, u32 mtu) 281 { 282 struct ipv6_pinfo *np = inet6_sk(sk); 283 struct ipv6hdr *iph; 284 struct sk_buff *skb; 285 struct ip6_mtuinfo *mtu_info; 286 287 if (!np->rxopt.bits.rxpmtu) 288 return; 289 290 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 291 if (!skb) 292 return; 293 294 skb_put(skb, sizeof(struct ipv6hdr)); 295 skb_reset_network_header(skb); 296 iph = ipv6_hdr(skb); 297 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 298 299 mtu_info = IP6CBMTU(skb); 300 if (!mtu_info) { 301 kfree_skb(skb); 302 return; 303 } 304 305 mtu_info->ip6m_mtu = mtu; 306 mtu_info->ip6m_addr.sin6_family = AF_INET6; 307 mtu_info->ip6m_addr.sin6_port = 0; 308 mtu_info->ip6m_addr.sin6_flowinfo = 0; 309 mtu_info->ip6m_addr.sin6_scope_id = fl->oif; 310 ipv6_addr_copy(&mtu_info->ip6m_addr.sin6_addr, &ipv6_hdr(skb)->daddr); 311 312 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 313 skb_reset_transport_header(skb); 314 315 skb = xchg(&np->rxpmtu, skb); 316 kfree_skb(skb); 317 } 318 319 /* 320 * Handle MSG_ERRQUEUE 321 */ 322 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 323 { 324 struct ipv6_pinfo *np = inet6_sk(sk); 325 struct sock_exterr_skb *serr; 326 struct sk_buff *skb, *skb2; 327 struct sockaddr_in6 *sin; 328 struct { 329 struct sock_extended_err ee; 330 struct sockaddr_in6 offender; 331 } errhdr; 332 int err; 333 int copied; 334 335 err = -EAGAIN; 336 skb = skb_dequeue(&sk->sk_error_queue); 337 if (skb == NULL) 338 goto out; 339 340 copied = skb->len; 341 if (copied > len) { 342 msg->msg_flags |= MSG_TRUNC; 343 copied = len; 344 } 345 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 346 if (err) 347 goto out_free_skb; 348 349 sock_recv_timestamp(msg, sk, skb); 350 351 serr = SKB_EXT_ERR(skb); 352 353 sin = (struct sockaddr_in6 *)msg->msg_name; 354 if (sin) { 355 const unsigned char *nh = skb_network_header(skb); 356 sin->sin6_family = AF_INET6; 357 sin->sin6_flowinfo = 0; 358 sin->sin6_port = serr->port; 359 sin->sin6_scope_id = 0; 360 if (skb->protocol == htons(ETH_P_IPV6)) { 361 ipv6_addr_copy(&sin->sin6_addr, 362 (struct in6_addr *)(nh + serr->addr_offset)); 363 if (np->sndflow) 364 sin->sin6_flowinfo = 365 (*(__be32 *)(nh + serr->addr_offset - 24) & 366 IPV6_FLOWINFO_MASK); 367 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 368 sin->sin6_scope_id = IP6CB(skb)->iif; 369 } else { 370 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 371 &sin->sin6_addr); 372 } 373 } 374 375 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 376 sin = &errhdr.offender; 377 sin->sin6_family = AF_UNSPEC; 378 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 379 sin->sin6_family = AF_INET6; 380 sin->sin6_flowinfo = 0; 381 sin->sin6_scope_id = 0; 382 if (skb->protocol == htons(ETH_P_IPV6)) { 383 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); 384 if (np->rxopt.all) 385 datagram_recv_ctl(sk, msg, skb); 386 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 387 sin->sin6_scope_id = 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 if (inet->cmsg_flags) 394 ip_cmsg_recv(msg, skb); 395 } 396 } 397 398 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 399 400 /* Now we could try to dump offended packet options */ 401 402 msg->msg_flags |= MSG_ERRQUEUE; 403 err = copied; 404 405 /* Reset and regenerate socket error */ 406 spin_lock_bh(&sk->sk_error_queue.lock); 407 sk->sk_err = 0; 408 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 409 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 410 spin_unlock_bh(&sk->sk_error_queue.lock); 411 sk->sk_error_report(sk); 412 } else { 413 spin_unlock_bh(&sk->sk_error_queue.lock); 414 } 415 416 out_free_skb: 417 kfree_skb(skb); 418 out: 419 return err; 420 } 421 422 /* 423 * Handle IPV6_RECVPATHMTU 424 */ 425 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len) 426 { 427 struct ipv6_pinfo *np = inet6_sk(sk); 428 struct sk_buff *skb; 429 struct sockaddr_in6 *sin; 430 struct ip6_mtuinfo mtu_info; 431 int err; 432 int copied; 433 434 err = -EAGAIN; 435 skb = xchg(&np->rxpmtu, NULL); 436 if (skb == NULL) 437 goto out; 438 439 copied = skb->len; 440 if (copied > len) { 441 msg->msg_flags |= MSG_TRUNC; 442 copied = len; 443 } 444 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 445 if (err) 446 goto out_free_skb; 447 448 sock_recv_timestamp(msg, sk, skb); 449 450 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 451 452 sin = (struct sockaddr_in6 *)msg->msg_name; 453 if (sin) { 454 sin->sin6_family = AF_INET6; 455 sin->sin6_flowinfo = 0; 456 sin->sin6_port = 0; 457 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 458 ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr); 459 } 460 461 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 462 463 err = copied; 464 465 out_free_skb: 466 kfree_skb(skb); 467 out: 468 return err; 469 } 470 471 472 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 473 { 474 struct ipv6_pinfo *np = inet6_sk(sk); 475 struct inet6_skb_parm *opt = IP6CB(skb); 476 unsigned char *nh = skb_network_header(skb); 477 478 if (np->rxopt.bits.rxinfo) { 479 struct in6_pktinfo src_info; 480 481 src_info.ipi6_ifindex = opt->iif; 482 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 483 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 484 } 485 486 if (np->rxopt.bits.rxhlim) { 487 int hlim = ipv6_hdr(skb)->hop_limit; 488 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 489 } 490 491 if (np->rxopt.bits.rxtclass) { 492 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; 493 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 494 } 495 496 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 497 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 498 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 499 } 500 501 /* HbH is allowed only once */ 502 if (np->rxopt.bits.hopopts && opt->hop) { 503 u8 *ptr = nh + opt->hop; 504 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 505 } 506 507 if (opt->lastopt && 508 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 509 /* 510 * Silly enough, but we need to reparse in order to 511 * report extension headers (except for HbH) 512 * in order. 513 * 514 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 515 * (and WILL NOT be) defined because 516 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 517 */ 518 unsigned int off = sizeof(struct ipv6hdr); 519 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 520 521 while (off <= opt->lastopt) { 522 unsigned len; 523 u8 *ptr = nh + off; 524 525 switch(nexthdr) { 526 case IPPROTO_DSTOPTS: 527 nexthdr = ptr[0]; 528 len = (ptr[1] + 1) << 3; 529 if (np->rxopt.bits.dstopts) 530 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 531 break; 532 case IPPROTO_ROUTING: 533 nexthdr = ptr[0]; 534 len = (ptr[1] + 1) << 3; 535 if (np->rxopt.bits.srcrt) 536 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 537 break; 538 case IPPROTO_AH: 539 nexthdr = ptr[0]; 540 len = (ptr[1] + 2) << 2; 541 break; 542 default: 543 nexthdr = ptr[0]; 544 len = (ptr[1] + 1) << 3; 545 break; 546 } 547 548 off += len; 549 } 550 } 551 552 /* socket options in old style */ 553 if (np->rxopt.bits.rxoinfo) { 554 struct in6_pktinfo src_info; 555 556 src_info.ipi6_ifindex = opt->iif; 557 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 558 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 559 } 560 if (np->rxopt.bits.rxohlim) { 561 int hlim = ipv6_hdr(skb)->hop_limit; 562 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 563 } 564 if (np->rxopt.bits.ohopopts && opt->hop) { 565 u8 *ptr = nh + opt->hop; 566 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 567 } 568 if (np->rxopt.bits.odstopts && opt->dst0) { 569 u8 *ptr = nh + opt->dst0; 570 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 571 } 572 if (np->rxopt.bits.osrcrt && opt->srcrt) { 573 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 574 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 575 } 576 if (np->rxopt.bits.odstopts && opt->dst1) { 577 u8 *ptr = nh + opt->dst1; 578 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 579 } 580 return 0; 581 } 582 583 int datagram_send_ctl(struct net *net, 584 struct msghdr *msg, struct flowi *fl, 585 struct ipv6_txoptions *opt, 586 int *hlimit, int *tclass, int *dontfrag) 587 { 588 struct in6_pktinfo *src_info; 589 struct cmsghdr *cmsg; 590 struct ipv6_rt_hdr *rthdr; 591 struct ipv6_opt_hdr *hdr; 592 int len; 593 int err = 0; 594 595 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 596 int addr_type; 597 598 if (!CMSG_OK(msg, cmsg)) { 599 err = -EINVAL; 600 goto exit_f; 601 } 602 603 if (cmsg->cmsg_level != SOL_IPV6) 604 continue; 605 606 switch (cmsg->cmsg_type) { 607 case IPV6_PKTINFO: 608 case IPV6_2292PKTINFO: 609 { 610 struct net_device *dev = NULL; 611 612 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 613 err = -EINVAL; 614 goto exit_f; 615 } 616 617 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 618 619 if (src_info->ipi6_ifindex) { 620 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 621 return -EINVAL; 622 fl->oif = src_info->ipi6_ifindex; 623 } 624 625 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 626 627 rcu_read_lock(); 628 if (fl->oif) { 629 dev = dev_get_by_index_rcu(net, fl->oif); 630 if (!dev) { 631 rcu_read_unlock(); 632 return -ENODEV; 633 } 634 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 635 rcu_read_unlock(); 636 return -EINVAL; 637 } 638 639 if (addr_type != IPV6_ADDR_ANY) { 640 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 641 if (!ipv6_chk_addr(net, &src_info->ipi6_addr, 642 strict ? dev : NULL, 0)) 643 err = -EINVAL; 644 else 645 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 646 } 647 648 rcu_read_unlock(); 649 650 if (err) 651 goto exit_f; 652 653 break; 654 } 655 656 case IPV6_FLOWINFO: 657 if (cmsg->cmsg_len < CMSG_LEN(4)) { 658 err = -EINVAL; 659 goto exit_f; 660 } 661 662 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 663 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 664 err = -EINVAL; 665 goto exit_f; 666 } 667 } 668 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 669 break; 670 671 case IPV6_2292HOPOPTS: 672 case IPV6_HOPOPTS: 673 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 674 err = -EINVAL; 675 goto exit_f; 676 } 677 678 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 679 len = ((hdr->hdrlen + 1) << 3); 680 if (cmsg->cmsg_len < CMSG_LEN(len)) { 681 err = -EINVAL; 682 goto exit_f; 683 } 684 if (!capable(CAP_NET_RAW)) { 685 err = -EPERM; 686 goto exit_f; 687 } 688 opt->opt_nflen += len; 689 opt->hopopt = hdr; 690 break; 691 692 case IPV6_2292DSTOPTS: 693 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 694 err = -EINVAL; 695 goto exit_f; 696 } 697 698 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 699 len = ((hdr->hdrlen + 1) << 3); 700 if (cmsg->cmsg_len < CMSG_LEN(len)) { 701 err = -EINVAL; 702 goto exit_f; 703 } 704 if (!capable(CAP_NET_RAW)) { 705 err = -EPERM; 706 goto exit_f; 707 } 708 if (opt->dst1opt) { 709 err = -EINVAL; 710 goto exit_f; 711 } 712 opt->opt_flen += len; 713 opt->dst1opt = hdr; 714 break; 715 716 case IPV6_DSTOPTS: 717 case IPV6_RTHDRDSTOPTS: 718 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 719 err = -EINVAL; 720 goto exit_f; 721 } 722 723 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 724 len = ((hdr->hdrlen + 1) << 3); 725 if (cmsg->cmsg_len < CMSG_LEN(len)) { 726 err = -EINVAL; 727 goto exit_f; 728 } 729 if (!capable(CAP_NET_RAW)) { 730 err = -EPERM; 731 goto exit_f; 732 } 733 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 734 opt->opt_flen += len; 735 opt->dst1opt = hdr; 736 } else { 737 opt->opt_nflen += len; 738 opt->dst0opt = hdr; 739 } 740 break; 741 742 case IPV6_2292RTHDR: 743 case IPV6_RTHDR: 744 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 745 err = -EINVAL; 746 goto exit_f; 747 } 748 749 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 750 751 switch (rthdr->type) { 752 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 753 case IPV6_SRCRT_TYPE_2: 754 if (rthdr->hdrlen != 2 || 755 rthdr->segments_left != 1) { 756 err = -EINVAL; 757 goto exit_f; 758 } 759 break; 760 #endif 761 default: 762 err = -EINVAL; 763 goto exit_f; 764 } 765 766 len = ((rthdr->hdrlen + 1) << 3); 767 768 if (cmsg->cmsg_len < CMSG_LEN(len)) { 769 err = -EINVAL; 770 goto exit_f; 771 } 772 773 /* segments left must also match */ 774 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 775 err = -EINVAL; 776 goto exit_f; 777 } 778 779 opt->opt_nflen += len; 780 opt->srcrt = rthdr; 781 782 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 783 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 784 785 opt->opt_nflen += dsthdrlen; 786 opt->dst0opt = opt->dst1opt; 787 opt->dst1opt = NULL; 788 opt->opt_flen -= dsthdrlen; 789 } 790 791 break; 792 793 case IPV6_2292HOPLIMIT: 794 case IPV6_HOPLIMIT: 795 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 796 err = -EINVAL; 797 goto exit_f; 798 } 799 800 *hlimit = *(int *)CMSG_DATA(cmsg); 801 if (*hlimit < -1 || *hlimit > 0xff) { 802 err = -EINVAL; 803 goto exit_f; 804 } 805 806 break; 807 808 case IPV6_TCLASS: 809 { 810 int tc; 811 812 err = -EINVAL; 813 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 814 goto exit_f; 815 } 816 817 tc = *(int *)CMSG_DATA(cmsg); 818 if (tc < -1 || tc > 0xff) 819 goto exit_f; 820 821 err = 0; 822 *tclass = tc; 823 824 break; 825 } 826 827 case IPV6_DONTFRAG: 828 { 829 int df; 830 831 err = -EINVAL; 832 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 833 goto exit_f; 834 } 835 836 df = *(int *)CMSG_DATA(cmsg); 837 if (df < 0 || df > 1) 838 goto exit_f; 839 840 err = 0; 841 *dontfrag = df; 842 843 break; 844 } 845 default: 846 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 847 cmsg->cmsg_type); 848 err = -EINVAL; 849 goto exit_f; 850 } 851 } 852 853 exit_f: 854 return err; 855 } 856