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 = NULL, final; 42 struct dst_entry *dst; 43 struct flowi fl; 44 struct ip6_flowlabel *flowlabel = NULL; 45 int addr_type; 46 int err; 47 48 if (usin->sin6_family == AF_INET) { 49 if (__ipv6_only_sock(sk)) 50 return -EAFNOSUPPORT; 51 err = ip4_datagram_connect(sk, uaddr, addr_len); 52 goto ipv4_connected; 53 } 54 55 if (addr_len < SIN6_LEN_RFC2133) 56 return -EINVAL; 57 58 if (usin->sin6_family != AF_INET6) 59 return -EAFNOSUPPORT; 60 61 memset(&fl, 0, sizeof(fl)); 62 if (np->sndflow) { 63 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 64 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 65 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 66 if (flowlabel == NULL) 67 return -EINVAL; 68 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 69 } 70 } 71 72 addr_type = ipv6_addr_type(&usin->sin6_addr); 73 74 if (addr_type == IPV6_ADDR_ANY) { 75 /* 76 * connect to self 77 */ 78 usin->sin6_addr.s6_addr[15] = 0x01; 79 } 80 81 daddr = &usin->sin6_addr; 82 83 if (addr_type == IPV6_ADDR_MAPPED) { 84 struct sockaddr_in sin; 85 86 if (__ipv6_only_sock(sk)) { 87 err = -ENETUNREACH; 88 goto out; 89 } 90 sin.sin_family = AF_INET; 91 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 92 sin.sin_port = usin->sin6_port; 93 94 err = ip4_datagram_connect(sk, 95 (struct sockaddr*) &sin, 96 sizeof(sin)); 97 98 ipv4_connected: 99 if (err) 100 goto out; 101 102 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); 103 104 if (ipv6_addr_any(&np->saddr)) 105 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 106 107 if (ipv6_addr_any(&np->rcv_saddr)) 108 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 109 &np->rcv_saddr); 110 111 goto out; 112 } 113 114 if (addr_type&IPV6_ADDR_LINKLOCAL) { 115 if (addr_len >= sizeof(struct sockaddr_in6) && 116 usin->sin6_scope_id) { 117 if (sk->sk_bound_dev_if && 118 sk->sk_bound_dev_if != usin->sin6_scope_id) { 119 err = -EINVAL; 120 goto out; 121 } 122 sk->sk_bound_dev_if = usin->sin6_scope_id; 123 } 124 125 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 126 sk->sk_bound_dev_if = np->mcast_oif; 127 128 /* Connect to link-local address requires an interface */ 129 if (!sk->sk_bound_dev_if) { 130 err = -EINVAL; 131 goto out; 132 } 133 } 134 135 ipv6_addr_copy(&np->daddr, daddr); 136 np->flow_label = fl.fl6_flowlabel; 137 138 inet->inet_dport = usin->sin6_port; 139 140 /* 141 * Check for a route to destination an obtain the 142 * destination cache for it. 143 */ 144 145 fl.proto = sk->sk_protocol; 146 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 147 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 148 fl.oif = sk->sk_bound_dev_if; 149 fl.mark = sk->sk_mark; 150 fl.fl_ip_dport = inet->inet_dport; 151 fl.fl_ip_sport = inet->inet_sport; 152 153 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) 154 fl.oif = np->mcast_oif; 155 156 security_sk_classify_flow(sk, &fl); 157 158 if (flowlabel) { 159 if (flowlabel->opt && flowlabel->opt->srcrt) { 160 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; 161 ipv6_addr_copy(&final, &fl.fl6_dst); 162 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 163 final_p = &final; 164 } 165 } else if (np->opt && np->opt->srcrt) { 166 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 167 ipv6_addr_copy(&final, &fl.fl6_dst); 168 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 169 final_p = &final; 170 } 171 172 err = ip6_dst_lookup(sk, &dst, &fl); 173 if (err) 174 goto out; 175 if (final_p) 176 ipv6_addr_copy(&fl.fl6_dst, final_p); 177 178 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 179 if (err < 0) { 180 if (err == -EREMOTE) 181 err = ip6_dst_blackhole(sk, &dst, &fl); 182 if (err < 0) 183 goto out; 184 } 185 186 /* source address lookup done in ip6_dst_lookup */ 187 188 if (ipv6_addr_any(&np->saddr)) 189 ipv6_addr_copy(&np->saddr, &fl.fl6_src); 190 191 if (ipv6_addr_any(&np->rcv_saddr)) { 192 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); 193 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 194 } 195 196 ip6_dst_store(sk, dst, 197 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 198 &np->daddr : NULL, 199 #ifdef CONFIG_IPV6_SUBTREES 200 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 201 &np->saddr : 202 #endif 203 NULL); 204 205 sk->sk_state = TCP_ESTABLISHED; 206 out: 207 fl6_sock_release(flowlabel); 208 return err; 209 } 210 211 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 212 __be16 port, u32 info, u8 *payload) 213 { 214 struct ipv6_pinfo *np = inet6_sk(sk); 215 struct icmp6hdr *icmph = icmp6_hdr(skb); 216 struct sock_exterr_skb *serr; 217 218 if (!np->recverr) 219 return; 220 221 skb = skb_clone(skb, GFP_ATOMIC); 222 if (!skb) 223 return; 224 225 skb->protocol = htons(ETH_P_IPV6); 226 227 serr = SKB_EXT_ERR(skb); 228 serr->ee.ee_errno = err; 229 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 230 serr->ee.ee_type = icmph->icmp6_type; 231 serr->ee.ee_code = icmph->icmp6_code; 232 serr->ee.ee_pad = 0; 233 serr->ee.ee_info = info; 234 serr->ee.ee_data = 0; 235 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 236 skb_network_header(skb); 237 serr->port = port; 238 239 __skb_pull(skb, payload - skb->data); 240 skb_reset_transport_header(skb); 241 242 if (sock_queue_err_skb(sk, skb)) 243 kfree_skb(skb); 244 } 245 246 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 247 { 248 struct ipv6_pinfo *np = inet6_sk(sk); 249 struct sock_exterr_skb *serr; 250 struct ipv6hdr *iph; 251 struct sk_buff *skb; 252 253 if (!np->recverr) 254 return; 255 256 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 257 if (!skb) 258 return; 259 260 skb->protocol = htons(ETH_P_IPV6); 261 262 skb_put(skb, sizeof(struct ipv6hdr)); 263 skb_reset_network_header(skb); 264 iph = ipv6_hdr(skb); 265 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 266 267 serr = SKB_EXT_ERR(skb); 268 serr->ee.ee_errno = err; 269 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 270 serr->ee.ee_type = 0; 271 serr->ee.ee_code = 0; 272 serr->ee.ee_pad = 0; 273 serr->ee.ee_info = info; 274 serr->ee.ee_data = 0; 275 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 276 serr->port = fl->fl_ip_dport; 277 278 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 279 skb_reset_transport_header(skb); 280 281 if (sock_queue_err_skb(sk, skb)) 282 kfree_skb(skb); 283 } 284 285 /* 286 * Handle MSG_ERRQUEUE 287 */ 288 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 289 { 290 struct ipv6_pinfo *np = inet6_sk(sk); 291 struct sock_exterr_skb *serr; 292 struct sk_buff *skb, *skb2; 293 struct sockaddr_in6 *sin; 294 struct { 295 struct sock_extended_err ee; 296 struct sockaddr_in6 offender; 297 } errhdr; 298 int err; 299 int copied; 300 301 err = -EAGAIN; 302 skb = skb_dequeue(&sk->sk_error_queue); 303 if (skb == NULL) 304 goto out; 305 306 copied = skb->len; 307 if (copied > len) { 308 msg->msg_flags |= MSG_TRUNC; 309 copied = len; 310 } 311 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 312 if (err) 313 goto out_free_skb; 314 315 sock_recv_timestamp(msg, sk, skb); 316 317 serr = SKB_EXT_ERR(skb); 318 319 sin = (struct sockaddr_in6 *)msg->msg_name; 320 if (sin) { 321 const unsigned char *nh = skb_network_header(skb); 322 sin->sin6_family = AF_INET6; 323 sin->sin6_flowinfo = 0; 324 sin->sin6_port = serr->port; 325 sin->sin6_scope_id = 0; 326 if (skb->protocol == htons(ETH_P_IPV6)) { 327 ipv6_addr_copy(&sin->sin6_addr, 328 (struct in6_addr *)(nh + serr->addr_offset)); 329 if (np->sndflow) 330 sin->sin6_flowinfo = 331 (*(__be32 *)(nh + serr->addr_offset - 24) & 332 IPV6_FLOWINFO_MASK); 333 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 334 sin->sin6_scope_id = IP6CB(skb)->iif; 335 } else { 336 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 337 &sin->sin6_addr); 338 } 339 } 340 341 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 342 sin = &errhdr.offender; 343 sin->sin6_family = AF_UNSPEC; 344 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 345 sin->sin6_family = AF_INET6; 346 sin->sin6_flowinfo = 0; 347 sin->sin6_scope_id = 0; 348 if (skb->protocol == htons(ETH_P_IPV6)) { 349 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); 350 if (np->rxopt.all) 351 datagram_recv_ctl(sk, msg, skb); 352 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 353 sin->sin6_scope_id = IP6CB(skb)->iif; 354 } else { 355 struct inet_sock *inet = inet_sk(sk); 356 357 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 358 &sin->sin6_addr); 359 if (inet->cmsg_flags) 360 ip_cmsg_recv(msg, skb); 361 } 362 } 363 364 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 365 366 /* Now we could try to dump offended packet options */ 367 368 msg->msg_flags |= MSG_ERRQUEUE; 369 err = copied; 370 371 /* Reset and regenerate socket error */ 372 spin_lock_bh(&sk->sk_error_queue.lock); 373 sk->sk_err = 0; 374 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 375 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 376 spin_unlock_bh(&sk->sk_error_queue.lock); 377 sk->sk_error_report(sk); 378 } else { 379 spin_unlock_bh(&sk->sk_error_queue.lock); 380 } 381 382 out_free_skb: 383 kfree_skb(skb); 384 out: 385 return err; 386 } 387 388 389 390 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 391 { 392 struct ipv6_pinfo *np = inet6_sk(sk); 393 struct inet6_skb_parm *opt = IP6CB(skb); 394 unsigned char *nh = skb_network_header(skb); 395 396 if (np->rxopt.bits.rxinfo) { 397 struct in6_pktinfo src_info; 398 399 src_info.ipi6_ifindex = opt->iif; 400 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 401 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 402 } 403 404 if (np->rxopt.bits.rxhlim) { 405 int hlim = ipv6_hdr(skb)->hop_limit; 406 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 407 } 408 409 if (np->rxopt.bits.rxtclass) { 410 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; 411 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 412 } 413 414 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 415 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 416 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 417 } 418 419 /* HbH is allowed only once */ 420 if (np->rxopt.bits.hopopts && opt->hop) { 421 u8 *ptr = nh + opt->hop; 422 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 423 } 424 425 if (opt->lastopt && 426 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 427 /* 428 * Silly enough, but we need to reparse in order to 429 * report extension headers (except for HbH) 430 * in order. 431 * 432 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 433 * (and WILL NOT be) defined because 434 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 435 */ 436 unsigned int off = sizeof(struct ipv6hdr); 437 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 438 439 while (off <= opt->lastopt) { 440 unsigned len; 441 u8 *ptr = nh + off; 442 443 switch(nexthdr) { 444 case IPPROTO_DSTOPTS: 445 nexthdr = ptr[0]; 446 len = (ptr[1] + 1) << 3; 447 if (np->rxopt.bits.dstopts) 448 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 449 break; 450 case IPPROTO_ROUTING: 451 nexthdr = ptr[0]; 452 len = (ptr[1] + 1) << 3; 453 if (np->rxopt.bits.srcrt) 454 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 455 break; 456 case IPPROTO_AH: 457 nexthdr = ptr[0]; 458 len = (ptr[1] + 2) << 2; 459 break; 460 default: 461 nexthdr = ptr[0]; 462 len = (ptr[1] + 1) << 3; 463 break; 464 } 465 466 off += len; 467 } 468 } 469 470 /* socket options in old style */ 471 if (np->rxopt.bits.rxoinfo) { 472 struct in6_pktinfo src_info; 473 474 src_info.ipi6_ifindex = opt->iif; 475 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 476 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 477 } 478 if (np->rxopt.bits.rxohlim) { 479 int hlim = ipv6_hdr(skb)->hop_limit; 480 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 481 } 482 if (np->rxopt.bits.ohopopts && opt->hop) { 483 u8 *ptr = nh + opt->hop; 484 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 485 } 486 if (np->rxopt.bits.odstopts && opt->dst0) { 487 u8 *ptr = nh + opt->dst0; 488 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 489 } 490 if (np->rxopt.bits.osrcrt && opt->srcrt) { 491 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 492 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 493 } 494 if (np->rxopt.bits.odstopts && opt->dst1) { 495 u8 *ptr = nh + opt->dst1; 496 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 497 } 498 return 0; 499 } 500 501 int datagram_send_ctl(struct net *net, 502 struct msghdr *msg, struct flowi *fl, 503 struct ipv6_txoptions *opt, 504 int *hlimit, int *tclass) 505 { 506 struct in6_pktinfo *src_info; 507 struct cmsghdr *cmsg; 508 struct ipv6_rt_hdr *rthdr; 509 struct ipv6_opt_hdr *hdr; 510 int len; 511 int err = 0; 512 513 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 514 int addr_type; 515 516 if (!CMSG_OK(msg, cmsg)) { 517 err = -EINVAL; 518 goto exit_f; 519 } 520 521 if (cmsg->cmsg_level != SOL_IPV6) 522 continue; 523 524 switch (cmsg->cmsg_type) { 525 case IPV6_PKTINFO: 526 case IPV6_2292PKTINFO: 527 { 528 struct net_device *dev = NULL; 529 530 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 531 err = -EINVAL; 532 goto exit_f; 533 } 534 535 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 536 537 if (src_info->ipi6_ifindex) { 538 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 539 return -EINVAL; 540 fl->oif = src_info->ipi6_ifindex; 541 } 542 543 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 544 545 rcu_read_lock(); 546 if (fl->oif) { 547 dev = dev_get_by_index_rcu(net, fl->oif); 548 if (!dev) { 549 rcu_read_unlock(); 550 return -ENODEV; 551 } 552 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 553 rcu_read_unlock(); 554 return -EINVAL; 555 } 556 557 if (addr_type != IPV6_ADDR_ANY) { 558 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 559 if (!ipv6_chk_addr(net, &src_info->ipi6_addr, 560 strict ? dev : NULL, 0)) 561 err = -EINVAL; 562 else 563 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 564 } 565 566 rcu_read_unlock(); 567 568 if (err) 569 goto exit_f; 570 571 break; 572 } 573 574 case IPV6_FLOWINFO: 575 if (cmsg->cmsg_len < CMSG_LEN(4)) { 576 err = -EINVAL; 577 goto exit_f; 578 } 579 580 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 581 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 582 err = -EINVAL; 583 goto exit_f; 584 } 585 } 586 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 587 break; 588 589 case IPV6_2292HOPOPTS: 590 case IPV6_HOPOPTS: 591 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 592 err = -EINVAL; 593 goto exit_f; 594 } 595 596 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 597 len = ((hdr->hdrlen + 1) << 3); 598 if (cmsg->cmsg_len < CMSG_LEN(len)) { 599 err = -EINVAL; 600 goto exit_f; 601 } 602 if (!capable(CAP_NET_RAW)) { 603 err = -EPERM; 604 goto exit_f; 605 } 606 opt->opt_nflen += len; 607 opt->hopopt = hdr; 608 break; 609 610 case IPV6_2292DSTOPTS: 611 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 612 err = -EINVAL; 613 goto exit_f; 614 } 615 616 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 617 len = ((hdr->hdrlen + 1) << 3); 618 if (cmsg->cmsg_len < CMSG_LEN(len)) { 619 err = -EINVAL; 620 goto exit_f; 621 } 622 if (!capable(CAP_NET_RAW)) { 623 err = -EPERM; 624 goto exit_f; 625 } 626 if (opt->dst1opt) { 627 err = -EINVAL; 628 goto exit_f; 629 } 630 opt->opt_flen += len; 631 opt->dst1opt = hdr; 632 break; 633 634 case IPV6_DSTOPTS: 635 case IPV6_RTHDRDSTOPTS: 636 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 637 err = -EINVAL; 638 goto exit_f; 639 } 640 641 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 642 len = ((hdr->hdrlen + 1) << 3); 643 if (cmsg->cmsg_len < CMSG_LEN(len)) { 644 err = -EINVAL; 645 goto exit_f; 646 } 647 if (!capable(CAP_NET_RAW)) { 648 err = -EPERM; 649 goto exit_f; 650 } 651 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 652 opt->opt_flen += len; 653 opt->dst1opt = hdr; 654 } else { 655 opt->opt_nflen += len; 656 opt->dst0opt = hdr; 657 } 658 break; 659 660 case IPV6_2292RTHDR: 661 case IPV6_RTHDR: 662 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 663 err = -EINVAL; 664 goto exit_f; 665 } 666 667 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 668 669 switch (rthdr->type) { 670 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 671 case IPV6_SRCRT_TYPE_2: 672 if (rthdr->hdrlen != 2 || 673 rthdr->segments_left != 1) { 674 err = -EINVAL; 675 goto exit_f; 676 } 677 break; 678 #endif 679 default: 680 err = -EINVAL; 681 goto exit_f; 682 } 683 684 len = ((rthdr->hdrlen + 1) << 3); 685 686 if (cmsg->cmsg_len < CMSG_LEN(len)) { 687 err = -EINVAL; 688 goto exit_f; 689 } 690 691 /* segments left must also match */ 692 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 693 err = -EINVAL; 694 goto exit_f; 695 } 696 697 opt->opt_nflen += len; 698 opt->srcrt = rthdr; 699 700 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 701 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 702 703 opt->opt_nflen += dsthdrlen; 704 opt->dst0opt = opt->dst1opt; 705 opt->dst1opt = NULL; 706 opt->opt_flen -= dsthdrlen; 707 } 708 709 break; 710 711 case IPV6_2292HOPLIMIT: 712 case IPV6_HOPLIMIT: 713 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 714 err = -EINVAL; 715 goto exit_f; 716 } 717 718 *hlimit = *(int *)CMSG_DATA(cmsg); 719 if (*hlimit < -1 || *hlimit > 0xff) { 720 err = -EINVAL; 721 goto exit_f; 722 } 723 724 break; 725 726 case IPV6_TCLASS: 727 { 728 int tc; 729 730 err = -EINVAL; 731 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 732 goto exit_f; 733 } 734 735 tc = *(int *)CMSG_DATA(cmsg); 736 if (tc < -1 || tc > 0xff) 737 goto exit_f; 738 739 err = 0; 740 *tclass = tc; 741 742 break; 743 } 744 default: 745 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 746 cmsg->cmsg_type); 747 err = -EINVAL; 748 goto exit_f; 749 } 750 } 751 752 exit_f: 753 return err; 754 } 755