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 serr = SKB_EXT_ERR(skb); 226 serr->ee.ee_errno = err; 227 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 228 serr->ee.ee_type = icmph->icmp6_type; 229 serr->ee.ee_code = icmph->icmp6_code; 230 serr->ee.ee_pad = 0; 231 serr->ee.ee_info = info; 232 serr->ee.ee_data = 0; 233 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 234 skb_network_header(skb); 235 serr->port = port; 236 237 __skb_pull(skb, payload - skb->data); 238 skb_reset_transport_header(skb); 239 240 if (sock_queue_err_skb(sk, skb)) 241 kfree_skb(skb); 242 } 243 244 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 245 { 246 struct ipv6_pinfo *np = inet6_sk(sk); 247 struct sock_exterr_skb *serr; 248 struct ipv6hdr *iph; 249 struct sk_buff *skb; 250 251 if (!np->recverr) 252 return; 253 254 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 255 if (!skb) 256 return; 257 258 skb_put(skb, sizeof(struct ipv6hdr)); 259 skb_reset_network_header(skb); 260 iph = ipv6_hdr(skb); 261 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 262 263 serr = SKB_EXT_ERR(skb); 264 serr->ee.ee_errno = err; 265 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 266 serr->ee.ee_type = 0; 267 serr->ee.ee_code = 0; 268 serr->ee.ee_pad = 0; 269 serr->ee.ee_info = info; 270 serr->ee.ee_data = 0; 271 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 272 serr->port = fl->fl_ip_dport; 273 274 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 275 skb_reset_transport_header(skb); 276 277 if (sock_queue_err_skb(sk, skb)) 278 kfree_skb(skb); 279 } 280 281 /* 282 * Handle MSG_ERRQUEUE 283 */ 284 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 285 { 286 struct ipv6_pinfo *np = inet6_sk(sk); 287 struct sock_exterr_skb *serr; 288 struct sk_buff *skb, *skb2; 289 struct sockaddr_in6 *sin; 290 struct { 291 struct sock_extended_err ee; 292 struct sockaddr_in6 offender; 293 } errhdr; 294 int err; 295 int copied; 296 297 err = -EAGAIN; 298 skb = skb_dequeue(&sk->sk_error_queue); 299 if (skb == NULL) 300 goto out; 301 302 copied = skb->len; 303 if (copied > len) { 304 msg->msg_flags |= MSG_TRUNC; 305 copied = len; 306 } 307 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 308 if (err) 309 goto out_free_skb; 310 311 sock_recv_timestamp(msg, sk, skb); 312 313 serr = SKB_EXT_ERR(skb); 314 315 sin = (struct sockaddr_in6 *)msg->msg_name; 316 if (sin) { 317 const unsigned char *nh = skb_network_header(skb); 318 sin->sin6_family = AF_INET6; 319 sin->sin6_flowinfo = 0; 320 sin->sin6_port = serr->port; 321 sin->sin6_scope_id = 0; 322 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 323 ipv6_addr_copy(&sin->sin6_addr, 324 (struct in6_addr *)(nh + serr->addr_offset)); 325 if (np->sndflow) 326 sin->sin6_flowinfo = 327 (*(__be32 *)(nh + serr->addr_offset - 24) & 328 IPV6_FLOWINFO_MASK); 329 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 330 sin->sin6_scope_id = IP6CB(skb)->iif; 331 } else { 332 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 333 &sin->sin6_addr); 334 } 335 } 336 337 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 338 sin = &errhdr.offender; 339 sin->sin6_family = AF_UNSPEC; 340 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 341 sin->sin6_family = AF_INET6; 342 sin->sin6_flowinfo = 0; 343 sin->sin6_scope_id = 0; 344 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 345 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); 346 if (np->rxopt.all) 347 datagram_recv_ctl(sk, msg, skb); 348 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 349 sin->sin6_scope_id = IP6CB(skb)->iif; 350 } else { 351 struct inet_sock *inet = inet_sk(sk); 352 353 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 354 &sin->sin6_addr); 355 if (inet->cmsg_flags) 356 ip_cmsg_recv(msg, skb); 357 } 358 } 359 360 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 361 362 /* Now we could try to dump offended packet options */ 363 364 msg->msg_flags |= MSG_ERRQUEUE; 365 err = copied; 366 367 /* Reset and regenerate socket error */ 368 spin_lock_bh(&sk->sk_error_queue.lock); 369 sk->sk_err = 0; 370 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 371 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 372 spin_unlock_bh(&sk->sk_error_queue.lock); 373 sk->sk_error_report(sk); 374 } else { 375 spin_unlock_bh(&sk->sk_error_queue.lock); 376 } 377 378 out_free_skb: 379 kfree_skb(skb); 380 out: 381 return err; 382 } 383 384 385 386 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 387 { 388 struct ipv6_pinfo *np = inet6_sk(sk); 389 struct inet6_skb_parm *opt = IP6CB(skb); 390 unsigned char *nh = skb_network_header(skb); 391 392 if (np->rxopt.bits.rxinfo) { 393 struct in6_pktinfo src_info; 394 395 src_info.ipi6_ifindex = opt->iif; 396 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 397 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 398 } 399 400 if (np->rxopt.bits.rxhlim) { 401 int hlim = ipv6_hdr(skb)->hop_limit; 402 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 403 } 404 405 if (np->rxopt.bits.rxtclass) { 406 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; 407 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 408 } 409 410 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 411 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 412 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 413 } 414 415 /* HbH is allowed only once */ 416 if (np->rxopt.bits.hopopts && opt->hop) { 417 u8 *ptr = nh + opt->hop; 418 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 419 } 420 421 if (opt->lastopt && 422 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 423 /* 424 * Silly enough, but we need to reparse in order to 425 * report extension headers (except for HbH) 426 * in order. 427 * 428 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 429 * (and WILL NOT be) defined because 430 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 431 */ 432 unsigned int off = sizeof(struct ipv6hdr); 433 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 434 435 while (off <= opt->lastopt) { 436 unsigned len; 437 u8 *ptr = nh + off; 438 439 switch(nexthdr) { 440 case IPPROTO_DSTOPTS: 441 nexthdr = ptr[0]; 442 len = (ptr[1] + 1) << 3; 443 if (np->rxopt.bits.dstopts) 444 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 445 break; 446 case IPPROTO_ROUTING: 447 nexthdr = ptr[0]; 448 len = (ptr[1] + 1) << 3; 449 if (np->rxopt.bits.srcrt) 450 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 451 break; 452 case IPPROTO_AH: 453 nexthdr = ptr[0]; 454 len = (ptr[1] + 2) << 2; 455 break; 456 default: 457 nexthdr = ptr[0]; 458 len = (ptr[1] + 1) << 3; 459 break; 460 } 461 462 off += len; 463 } 464 } 465 466 /* socket options in old style */ 467 if (np->rxopt.bits.rxoinfo) { 468 struct in6_pktinfo src_info; 469 470 src_info.ipi6_ifindex = opt->iif; 471 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 472 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 473 } 474 if (np->rxopt.bits.rxohlim) { 475 int hlim = ipv6_hdr(skb)->hop_limit; 476 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 477 } 478 if (np->rxopt.bits.ohopopts && opt->hop) { 479 u8 *ptr = nh + opt->hop; 480 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 481 } 482 if (np->rxopt.bits.odstopts && opt->dst0) { 483 u8 *ptr = nh + opt->dst0; 484 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 485 } 486 if (np->rxopt.bits.osrcrt && opt->srcrt) { 487 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 488 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 489 } 490 if (np->rxopt.bits.odstopts && opt->dst1) { 491 u8 *ptr = nh + opt->dst1; 492 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 493 } 494 return 0; 495 } 496 497 int datagram_send_ctl(struct net *net, 498 struct msghdr *msg, struct flowi *fl, 499 struct ipv6_txoptions *opt, 500 int *hlimit, int *tclass) 501 { 502 struct in6_pktinfo *src_info; 503 struct cmsghdr *cmsg; 504 struct ipv6_rt_hdr *rthdr; 505 struct ipv6_opt_hdr *hdr; 506 int len; 507 int err = 0; 508 509 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 510 int addr_type; 511 512 if (!CMSG_OK(msg, cmsg)) { 513 err = -EINVAL; 514 goto exit_f; 515 } 516 517 if (cmsg->cmsg_level != SOL_IPV6) 518 continue; 519 520 switch (cmsg->cmsg_type) { 521 case IPV6_PKTINFO: 522 case IPV6_2292PKTINFO: 523 { 524 struct net_device *dev = NULL; 525 526 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 527 err = -EINVAL; 528 goto exit_f; 529 } 530 531 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 532 533 if (src_info->ipi6_ifindex) { 534 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 535 return -EINVAL; 536 fl->oif = src_info->ipi6_ifindex; 537 } 538 539 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 540 541 rcu_read_lock(); 542 if (fl->oif) { 543 dev = dev_get_by_index_rcu(net, fl->oif); 544 if (!dev) { 545 rcu_read_unlock(); 546 return -ENODEV; 547 } 548 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 549 rcu_read_unlock(); 550 return -EINVAL; 551 } 552 553 if (addr_type != IPV6_ADDR_ANY) { 554 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 555 if (!ipv6_chk_addr(net, &src_info->ipi6_addr, 556 strict ? dev : NULL, 0)) 557 err = -EINVAL; 558 else 559 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 560 } 561 562 rcu_read_unlock(); 563 564 if (err) 565 goto exit_f; 566 567 break; 568 } 569 570 case IPV6_FLOWINFO: 571 if (cmsg->cmsg_len < CMSG_LEN(4)) { 572 err = -EINVAL; 573 goto exit_f; 574 } 575 576 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 577 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 578 err = -EINVAL; 579 goto exit_f; 580 } 581 } 582 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 583 break; 584 585 case IPV6_2292HOPOPTS: 586 case IPV6_HOPOPTS: 587 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 588 err = -EINVAL; 589 goto exit_f; 590 } 591 592 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 593 len = ((hdr->hdrlen + 1) << 3); 594 if (cmsg->cmsg_len < CMSG_LEN(len)) { 595 err = -EINVAL; 596 goto exit_f; 597 } 598 if (!capable(CAP_NET_RAW)) { 599 err = -EPERM; 600 goto exit_f; 601 } 602 opt->opt_nflen += len; 603 opt->hopopt = hdr; 604 break; 605 606 case IPV6_2292DSTOPTS: 607 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 608 err = -EINVAL; 609 goto exit_f; 610 } 611 612 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 613 len = ((hdr->hdrlen + 1) << 3); 614 if (cmsg->cmsg_len < CMSG_LEN(len)) { 615 err = -EINVAL; 616 goto exit_f; 617 } 618 if (!capable(CAP_NET_RAW)) { 619 err = -EPERM; 620 goto exit_f; 621 } 622 if (opt->dst1opt) { 623 err = -EINVAL; 624 goto exit_f; 625 } 626 opt->opt_flen += len; 627 opt->dst1opt = hdr; 628 break; 629 630 case IPV6_DSTOPTS: 631 case IPV6_RTHDRDSTOPTS: 632 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 633 err = -EINVAL; 634 goto exit_f; 635 } 636 637 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 638 len = ((hdr->hdrlen + 1) << 3); 639 if (cmsg->cmsg_len < CMSG_LEN(len)) { 640 err = -EINVAL; 641 goto exit_f; 642 } 643 if (!capable(CAP_NET_RAW)) { 644 err = -EPERM; 645 goto exit_f; 646 } 647 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 648 opt->opt_flen += len; 649 opt->dst1opt = hdr; 650 } else { 651 opt->opt_nflen += len; 652 opt->dst0opt = hdr; 653 } 654 break; 655 656 case IPV6_2292RTHDR: 657 case IPV6_RTHDR: 658 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 659 err = -EINVAL; 660 goto exit_f; 661 } 662 663 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 664 665 switch (rthdr->type) { 666 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 667 case IPV6_SRCRT_TYPE_2: 668 if (rthdr->hdrlen != 2 || 669 rthdr->segments_left != 1) { 670 err = -EINVAL; 671 goto exit_f; 672 } 673 break; 674 #endif 675 default: 676 err = -EINVAL; 677 goto exit_f; 678 } 679 680 len = ((rthdr->hdrlen + 1) << 3); 681 682 if (cmsg->cmsg_len < CMSG_LEN(len)) { 683 err = -EINVAL; 684 goto exit_f; 685 } 686 687 /* segments left must also match */ 688 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 689 err = -EINVAL; 690 goto exit_f; 691 } 692 693 opt->opt_nflen += len; 694 opt->srcrt = rthdr; 695 696 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 697 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 698 699 opt->opt_nflen += dsthdrlen; 700 opt->dst0opt = opt->dst1opt; 701 opt->dst1opt = NULL; 702 opt->opt_flen -= dsthdrlen; 703 } 704 705 break; 706 707 case IPV6_2292HOPLIMIT: 708 case IPV6_HOPLIMIT: 709 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 710 err = -EINVAL; 711 goto exit_f; 712 } 713 714 *hlimit = *(int *)CMSG_DATA(cmsg); 715 if (*hlimit < -1 || *hlimit > 0xff) { 716 err = -EINVAL; 717 goto exit_f; 718 } 719 720 break; 721 722 case IPV6_TCLASS: 723 { 724 int tc; 725 726 err = -EINVAL; 727 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 728 goto exit_f; 729 } 730 731 tc = *(int *)CMSG_DATA(cmsg); 732 if (tc < -1 || tc > 0xff) 733 goto exit_f; 734 735 err = 0; 736 *tclass = tc; 737 738 break; 739 } 740 default: 741 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 742 cmsg->cmsg_type); 743 err = -EINVAL; 744 goto exit_f; 745 } 746 } 747 748 exit_f: 749 return err; 750 } 751