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 25 #include <net/ipv6.h> 26 #include <net/ndisc.h> 27 #include <net/addrconf.h> 28 #include <net/transp_v6.h> 29 #include <net/ip6_route.h> 30 #include <net/tcp_states.h> 31 32 #include <linux/errqueue.h> 33 #include <asm/uaccess.h> 34 35 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 36 { 37 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 38 struct inet_sock *inet = inet_sk(sk); 39 struct ipv6_pinfo *np = inet6_sk(sk); 40 struct in6_addr *daddr, *final_p = NULL, final; 41 struct dst_entry *dst; 42 struct flowi fl; 43 struct ip6_flowlabel *flowlabel = NULL; 44 int addr_type; 45 int err; 46 47 if (usin->sin6_family == AF_INET) { 48 if (__ipv6_only_sock(sk)) 49 return -EAFNOSUPPORT; 50 err = ip4_datagram_connect(sk, uaddr, addr_len); 51 goto ipv4_connected; 52 } 53 54 if (addr_len < SIN6_LEN_RFC2133) 55 return -EINVAL; 56 57 if (usin->sin6_family != AF_INET6) 58 return -EAFNOSUPPORT; 59 60 memset(&fl, 0, sizeof(fl)); 61 if (np->sndflow) { 62 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 63 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 64 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 65 if (flowlabel == NULL) 66 return -EINVAL; 67 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 68 } 69 } 70 71 addr_type = ipv6_addr_type(&usin->sin6_addr); 72 73 if (addr_type == IPV6_ADDR_ANY) { 74 /* 75 * connect to self 76 */ 77 usin->sin6_addr.s6_addr[15] = 0x01; 78 } 79 80 daddr = &usin->sin6_addr; 81 82 if (addr_type == IPV6_ADDR_MAPPED) { 83 struct sockaddr_in sin; 84 85 if (__ipv6_only_sock(sk)) { 86 err = -ENETUNREACH; 87 goto out; 88 } 89 sin.sin_family = AF_INET; 90 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 91 sin.sin_port = usin->sin6_port; 92 93 err = ip4_datagram_connect(sk, 94 (struct sockaddr*) &sin, 95 sizeof(sin)); 96 97 ipv4_connected: 98 if (err) 99 goto out; 100 101 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); 102 103 if (ipv6_addr_any(&np->saddr)) 104 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 105 106 if (ipv6_addr_any(&np->rcv_saddr)) 107 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 108 &np->rcv_saddr); 109 110 goto out; 111 } 112 113 if (addr_type&IPV6_ADDR_LINKLOCAL) { 114 if (addr_len >= sizeof(struct sockaddr_in6) && 115 usin->sin6_scope_id) { 116 if (sk->sk_bound_dev_if && 117 sk->sk_bound_dev_if != usin->sin6_scope_id) { 118 err = -EINVAL; 119 goto out; 120 } 121 sk->sk_bound_dev_if = usin->sin6_scope_id; 122 } 123 124 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 125 sk->sk_bound_dev_if = np->mcast_oif; 126 127 /* Connect to link-local address requires an interface */ 128 if (!sk->sk_bound_dev_if) { 129 err = -EINVAL; 130 goto out; 131 } 132 } 133 134 ipv6_addr_copy(&np->daddr, daddr); 135 np->flow_label = fl.fl6_flowlabel; 136 137 inet->inet_dport = usin->sin6_port; 138 139 /* 140 * Check for a route to destination an obtain the 141 * destination cache for it. 142 */ 143 144 fl.proto = sk->sk_protocol; 145 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 146 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 147 fl.oif = sk->sk_bound_dev_if; 148 fl.mark = sk->sk_mark; 149 fl.fl_ip_dport = inet->inet_dport; 150 fl.fl_ip_sport = inet->inet_sport; 151 152 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) 153 fl.oif = np->mcast_oif; 154 155 security_sk_classify_flow(sk, &fl); 156 157 if (flowlabel) { 158 if (flowlabel->opt && flowlabel->opt->srcrt) { 159 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; 160 ipv6_addr_copy(&final, &fl.fl6_dst); 161 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 162 final_p = &final; 163 } 164 } else if (np->opt && np->opt->srcrt) { 165 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 166 ipv6_addr_copy(&final, &fl.fl6_dst); 167 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 168 final_p = &final; 169 } 170 171 err = ip6_dst_lookup(sk, &dst, &fl); 172 if (err) 173 goto out; 174 if (final_p) 175 ipv6_addr_copy(&fl.fl6_dst, final_p); 176 177 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 178 if (err < 0) { 179 if (err == -EREMOTE) 180 err = ip6_dst_blackhole(sk, &dst, &fl); 181 if (err < 0) 182 goto out; 183 } 184 185 /* source address lookup done in ip6_dst_lookup */ 186 187 if (ipv6_addr_any(&np->saddr)) 188 ipv6_addr_copy(&np->saddr, &fl.fl6_src); 189 190 if (ipv6_addr_any(&np->rcv_saddr)) { 191 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); 192 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 193 } 194 195 ip6_dst_store(sk, dst, 196 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 197 &np->daddr : NULL, 198 #ifdef CONFIG_IPV6_SUBTREES 199 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 200 &np->saddr : 201 #endif 202 NULL); 203 204 sk->sk_state = TCP_ESTABLISHED; 205 out: 206 fl6_sock_release(flowlabel); 207 return err; 208 } 209 210 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 211 __be16 port, u32 info, u8 *payload) 212 { 213 struct ipv6_pinfo *np = inet6_sk(sk); 214 struct icmp6hdr *icmph = icmp6_hdr(skb); 215 struct sock_exterr_skb *serr; 216 217 if (!np->recverr) 218 return; 219 220 skb = skb_clone(skb, GFP_ATOMIC); 221 if (!skb) 222 return; 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 flowi *fl, 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_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 /* 281 * Handle MSG_ERRQUEUE 282 */ 283 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 284 { 285 struct ipv6_pinfo *np = inet6_sk(sk); 286 struct sock_exterr_skb *serr; 287 struct sk_buff *skb, *skb2; 288 struct sockaddr_in6 *sin; 289 struct { 290 struct sock_extended_err ee; 291 struct sockaddr_in6 offender; 292 } errhdr; 293 int err; 294 int copied; 295 296 err = -EAGAIN; 297 skb = skb_dequeue(&sk->sk_error_queue); 298 if (skb == NULL) 299 goto out; 300 301 copied = skb->len; 302 if (copied > len) { 303 msg->msg_flags |= MSG_TRUNC; 304 copied = len; 305 } 306 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 307 if (err) 308 goto out_free_skb; 309 310 sock_recv_timestamp(msg, sk, skb); 311 312 serr = SKB_EXT_ERR(skb); 313 314 sin = (struct sockaddr_in6 *)msg->msg_name; 315 if (sin) { 316 const unsigned char *nh = skb_network_header(skb); 317 sin->sin6_family = AF_INET6; 318 sin->sin6_flowinfo = 0; 319 sin->sin6_port = serr->port; 320 sin->sin6_scope_id = 0; 321 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 322 ipv6_addr_copy(&sin->sin6_addr, 323 (struct in6_addr *)(nh + serr->addr_offset)); 324 if (np->sndflow) 325 sin->sin6_flowinfo = 326 (*(__be32 *)(nh + serr->addr_offset - 24) & 327 IPV6_FLOWINFO_MASK); 328 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 329 sin->sin6_scope_id = IP6CB(skb)->iif; 330 } else { 331 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 332 &sin->sin6_addr); 333 } 334 } 335 336 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 337 sin = &errhdr.offender; 338 sin->sin6_family = AF_UNSPEC; 339 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 340 sin->sin6_family = AF_INET6; 341 sin->sin6_flowinfo = 0; 342 sin->sin6_scope_id = 0; 343 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 344 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); 345 if (np->rxopt.all) 346 datagram_recv_ctl(sk, msg, skb); 347 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 348 sin->sin6_scope_id = IP6CB(skb)->iif; 349 } else { 350 struct inet_sock *inet = inet_sk(sk); 351 352 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 353 &sin->sin6_addr); 354 if (inet->cmsg_flags) 355 ip_cmsg_recv(msg, skb); 356 } 357 } 358 359 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 360 361 /* Now we could try to dump offended packet options */ 362 363 msg->msg_flags |= MSG_ERRQUEUE; 364 err = copied; 365 366 /* Reset and regenerate socket error */ 367 spin_lock_bh(&sk->sk_error_queue.lock); 368 sk->sk_err = 0; 369 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 370 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 371 spin_unlock_bh(&sk->sk_error_queue.lock); 372 sk->sk_error_report(sk); 373 } else { 374 spin_unlock_bh(&sk->sk_error_queue.lock); 375 } 376 377 out_free_skb: 378 kfree_skb(skb); 379 out: 380 return err; 381 } 382 383 384 385 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 386 { 387 struct ipv6_pinfo *np = inet6_sk(sk); 388 struct inet6_skb_parm *opt = IP6CB(skb); 389 unsigned char *nh = skb_network_header(skb); 390 391 if (np->rxopt.bits.rxinfo) { 392 struct in6_pktinfo src_info; 393 394 src_info.ipi6_ifindex = opt->iif; 395 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 396 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 397 } 398 399 if (np->rxopt.bits.rxhlim) { 400 int hlim = ipv6_hdr(skb)->hop_limit; 401 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 402 } 403 404 if (np->rxopt.bits.rxtclass) { 405 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; 406 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 407 } 408 409 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 410 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 411 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 412 } 413 414 /* HbH is allowed only once */ 415 if (np->rxopt.bits.hopopts && opt->hop) { 416 u8 *ptr = nh + opt->hop; 417 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 418 } 419 420 if (opt->lastopt && 421 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 422 /* 423 * Silly enough, but we need to reparse in order to 424 * report extension headers (except for HbH) 425 * in order. 426 * 427 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 428 * (and WILL NOT be) defined because 429 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 430 */ 431 unsigned int off = sizeof(struct ipv6hdr); 432 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 433 434 while (off <= opt->lastopt) { 435 unsigned len; 436 u8 *ptr = nh + off; 437 438 switch(nexthdr) { 439 case IPPROTO_DSTOPTS: 440 nexthdr = ptr[0]; 441 len = (ptr[1] + 1) << 3; 442 if (np->rxopt.bits.dstopts) 443 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 444 break; 445 case IPPROTO_ROUTING: 446 nexthdr = ptr[0]; 447 len = (ptr[1] + 1) << 3; 448 if (np->rxopt.bits.srcrt) 449 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 450 break; 451 case IPPROTO_AH: 452 nexthdr = ptr[0]; 453 len = (ptr[1] + 2) << 2; 454 break; 455 default: 456 nexthdr = ptr[0]; 457 len = (ptr[1] + 1) << 3; 458 break; 459 } 460 461 off += len; 462 } 463 } 464 465 /* socket options in old style */ 466 if (np->rxopt.bits.rxoinfo) { 467 struct in6_pktinfo src_info; 468 469 src_info.ipi6_ifindex = opt->iif; 470 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 471 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 472 } 473 if (np->rxopt.bits.rxohlim) { 474 int hlim = ipv6_hdr(skb)->hop_limit; 475 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 476 } 477 if (np->rxopt.bits.ohopopts && opt->hop) { 478 u8 *ptr = nh + opt->hop; 479 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 480 } 481 if (np->rxopt.bits.odstopts && opt->dst0) { 482 u8 *ptr = nh + opt->dst0; 483 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 484 } 485 if (np->rxopt.bits.osrcrt && opt->srcrt) { 486 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 487 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 488 } 489 if (np->rxopt.bits.odstopts && opt->dst1) { 490 u8 *ptr = nh + opt->dst1; 491 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 492 } 493 return 0; 494 } 495 496 int datagram_send_ctl(struct net *net, 497 struct msghdr *msg, struct flowi *fl, 498 struct ipv6_txoptions *opt, 499 int *hlimit, int *tclass) 500 { 501 struct in6_pktinfo *src_info; 502 struct cmsghdr *cmsg; 503 struct ipv6_rt_hdr *rthdr; 504 struct ipv6_opt_hdr *hdr; 505 int len; 506 int err = 0; 507 508 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 509 int addr_type; 510 511 if (!CMSG_OK(msg, cmsg)) { 512 err = -EINVAL; 513 goto exit_f; 514 } 515 516 if (cmsg->cmsg_level != SOL_IPV6) 517 continue; 518 519 switch (cmsg->cmsg_type) { 520 case IPV6_PKTINFO: 521 case IPV6_2292PKTINFO: 522 { 523 struct net_device *dev = NULL; 524 525 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 526 err = -EINVAL; 527 goto exit_f; 528 } 529 530 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 531 532 if (src_info->ipi6_ifindex) { 533 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 534 return -EINVAL; 535 fl->oif = src_info->ipi6_ifindex; 536 } 537 538 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 539 540 rcu_read_lock(); 541 if (fl->oif) { 542 dev = dev_get_by_index_rcu(net, fl->oif); 543 if (!dev) { 544 rcu_read_unlock(); 545 return -ENODEV; 546 } 547 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 548 rcu_read_unlock(); 549 return -EINVAL; 550 } 551 552 if (addr_type != IPV6_ADDR_ANY) { 553 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 554 if (!ipv6_chk_addr(net, &src_info->ipi6_addr, 555 strict ? dev : NULL, 0)) 556 err = -EINVAL; 557 else 558 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 559 } 560 561 rcu_read_unlock(); 562 563 if (err) 564 goto exit_f; 565 566 break; 567 } 568 569 case IPV6_FLOWINFO: 570 if (cmsg->cmsg_len < CMSG_LEN(4)) { 571 err = -EINVAL; 572 goto exit_f; 573 } 574 575 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 576 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 577 err = -EINVAL; 578 goto exit_f; 579 } 580 } 581 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 582 break; 583 584 case IPV6_2292HOPOPTS: 585 case IPV6_HOPOPTS: 586 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 587 err = -EINVAL; 588 goto exit_f; 589 } 590 591 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 592 len = ((hdr->hdrlen + 1) << 3); 593 if (cmsg->cmsg_len < CMSG_LEN(len)) { 594 err = -EINVAL; 595 goto exit_f; 596 } 597 if (!capable(CAP_NET_RAW)) { 598 err = -EPERM; 599 goto exit_f; 600 } 601 opt->opt_nflen += len; 602 opt->hopopt = hdr; 603 break; 604 605 case IPV6_2292DSTOPTS: 606 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 607 err = -EINVAL; 608 goto exit_f; 609 } 610 611 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 612 len = ((hdr->hdrlen + 1) << 3); 613 if (cmsg->cmsg_len < CMSG_LEN(len)) { 614 err = -EINVAL; 615 goto exit_f; 616 } 617 if (!capable(CAP_NET_RAW)) { 618 err = -EPERM; 619 goto exit_f; 620 } 621 if (opt->dst1opt) { 622 err = -EINVAL; 623 goto exit_f; 624 } 625 opt->opt_flen += len; 626 opt->dst1opt = hdr; 627 break; 628 629 case IPV6_DSTOPTS: 630 case IPV6_RTHDRDSTOPTS: 631 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 632 err = -EINVAL; 633 goto exit_f; 634 } 635 636 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 637 len = ((hdr->hdrlen + 1) << 3); 638 if (cmsg->cmsg_len < CMSG_LEN(len)) { 639 err = -EINVAL; 640 goto exit_f; 641 } 642 if (!capable(CAP_NET_RAW)) { 643 err = -EPERM; 644 goto exit_f; 645 } 646 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 647 opt->opt_flen += len; 648 opt->dst1opt = hdr; 649 } else { 650 opt->opt_nflen += len; 651 opt->dst0opt = hdr; 652 } 653 break; 654 655 case IPV6_2292RTHDR: 656 case IPV6_RTHDR: 657 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 658 err = -EINVAL; 659 goto exit_f; 660 } 661 662 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 663 664 switch (rthdr->type) { 665 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 666 case IPV6_SRCRT_TYPE_2: 667 if (rthdr->hdrlen != 2 || 668 rthdr->segments_left != 1) { 669 err = -EINVAL; 670 goto exit_f; 671 } 672 break; 673 #endif 674 default: 675 err = -EINVAL; 676 goto exit_f; 677 } 678 679 len = ((rthdr->hdrlen + 1) << 3); 680 681 if (cmsg->cmsg_len < CMSG_LEN(len)) { 682 err = -EINVAL; 683 goto exit_f; 684 } 685 686 /* segments left must also match */ 687 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 688 err = -EINVAL; 689 goto exit_f; 690 } 691 692 opt->opt_nflen += len; 693 opt->srcrt = rthdr; 694 695 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 696 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 697 698 opt->opt_nflen += dsthdrlen; 699 opt->dst0opt = opt->dst1opt; 700 opt->dst1opt = NULL; 701 opt->opt_flen -= dsthdrlen; 702 } 703 704 break; 705 706 case IPV6_2292HOPLIMIT: 707 case IPV6_HOPLIMIT: 708 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 709 err = -EINVAL; 710 goto exit_f; 711 } 712 713 *hlimit = *(int *)CMSG_DATA(cmsg); 714 if (*hlimit < -1 || *hlimit > 0xff) { 715 err = -EINVAL; 716 goto exit_f; 717 } 718 719 break; 720 721 case IPV6_TCLASS: 722 { 723 int tc; 724 725 err = -EINVAL; 726 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 727 goto exit_f; 728 } 729 730 tc = *(int *)CMSG_DATA(cmsg); 731 if (tc < -1 || tc > 0xff) 732 goto exit_f; 733 734 err = 0; 735 *tclass = tc; 736 737 break; 738 } 739 default: 740 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 741 cmsg->cmsg_type); 742 err = -EINVAL; 743 goto exit_f; 744 } 745 } 746 747 exit_f: 748 return err; 749 } 750