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(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr); 102 103 if (ipv6_addr_any(&np->saddr)) { 104 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff), 105 inet->saddr); 106 } 107 108 if (ipv6_addr_any(&np->rcv_saddr)) { 109 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff), 110 inet->rcv_saddr); 111 } 112 goto out; 113 } 114 115 if (addr_type&IPV6_ADDR_LINKLOCAL) { 116 if (addr_len >= sizeof(struct sockaddr_in6) && 117 usin->sin6_scope_id) { 118 if (sk->sk_bound_dev_if && 119 sk->sk_bound_dev_if != usin->sin6_scope_id) { 120 err = -EINVAL; 121 goto out; 122 } 123 sk->sk_bound_dev_if = usin->sin6_scope_id; 124 } 125 126 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 127 sk->sk_bound_dev_if = np->mcast_oif; 128 129 /* Connect to link-local address requires an interface */ 130 if (!sk->sk_bound_dev_if) { 131 err = -EINVAL; 132 goto out; 133 } 134 } 135 136 ipv6_addr_copy(&np->daddr, daddr); 137 np->flow_label = fl.fl6_flowlabel; 138 139 inet->dport = usin->sin6_port; 140 141 /* 142 * Check for a route to destination an obtain the 143 * destination cache for it. 144 */ 145 146 fl.proto = sk->sk_protocol; 147 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 148 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 149 fl.oif = sk->sk_bound_dev_if; 150 fl.fl_ip_dport = inet->dport; 151 fl.fl_ip_sport = 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->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(&sin->sin6_addr, 0, 0, 333 htonl(0xffff), 334 *(__be32 *)(nh + serr->addr_offset)); 335 } 336 } 337 338 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 339 sin = &errhdr.offender; 340 sin->sin6_family = AF_UNSPEC; 341 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 342 sin->sin6_family = AF_INET6; 343 sin->sin6_flowinfo = 0; 344 sin->sin6_scope_id = 0; 345 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 346 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); 347 if (np->rxopt.all) 348 datagram_recv_ctl(sk, msg, skb); 349 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 350 sin->sin6_scope_id = IP6CB(skb)->iif; 351 } else { 352 struct inet_sock *inet = inet_sk(sk); 353 354 ipv6_addr_set(&sin->sin6_addr, 0, 0, 355 htonl(0xffff), ip_hdr(skb)->saddr); 356 if (inet->cmsg_flags) 357 ip_cmsg_recv(msg, skb); 358 } 359 } 360 361 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 362 363 /* Now we could try to dump offended packet options */ 364 365 msg->msg_flags |= MSG_ERRQUEUE; 366 err = copied; 367 368 /* Reset and regenerate socket error */ 369 spin_lock_bh(&sk->sk_error_queue.lock); 370 sk->sk_err = 0; 371 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 372 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 373 spin_unlock_bh(&sk->sk_error_queue.lock); 374 sk->sk_error_report(sk); 375 } else { 376 spin_unlock_bh(&sk->sk_error_queue.lock); 377 } 378 379 out_free_skb: 380 kfree_skb(skb); 381 out: 382 return err; 383 } 384 385 386 387 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 388 { 389 struct ipv6_pinfo *np = inet6_sk(sk); 390 struct inet6_skb_parm *opt = IP6CB(skb); 391 unsigned char *nh = skb_network_header(skb); 392 393 if (np->rxopt.bits.rxinfo) { 394 struct in6_pktinfo src_info; 395 396 src_info.ipi6_ifindex = opt->iif; 397 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 398 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 399 } 400 401 if (np->rxopt.bits.rxhlim) { 402 int hlim = ipv6_hdr(skb)->hop_limit; 403 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 404 } 405 406 if (np->rxopt.bits.rxtclass) { 407 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; 408 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 409 } 410 411 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 412 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 413 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 414 } 415 416 /* HbH is allowed only once */ 417 if (np->rxopt.bits.hopopts && opt->hop) { 418 u8 *ptr = nh + opt->hop; 419 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 420 } 421 422 if (opt->lastopt && 423 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 424 /* 425 * Silly enough, but we need to reparse in order to 426 * report extension headers (except for HbH) 427 * in order. 428 * 429 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 430 * (and WILL NOT be) defined because 431 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 432 */ 433 unsigned int off = sizeof(struct ipv6hdr); 434 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 435 436 while (off <= opt->lastopt) { 437 unsigned len; 438 u8 *ptr = nh + off; 439 440 switch(nexthdr) { 441 case IPPROTO_DSTOPTS: 442 nexthdr = ptr[0]; 443 len = (ptr[1] + 1) << 3; 444 if (np->rxopt.bits.dstopts) 445 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 446 break; 447 case IPPROTO_ROUTING: 448 nexthdr = ptr[0]; 449 len = (ptr[1] + 1) << 3; 450 if (np->rxopt.bits.srcrt) 451 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 452 break; 453 case IPPROTO_AH: 454 nexthdr = ptr[0]; 455 len = (ptr[1] + 2) << 2; 456 break; 457 default: 458 nexthdr = ptr[0]; 459 len = (ptr[1] + 1) << 3; 460 break; 461 } 462 463 off += len; 464 } 465 } 466 467 /* socket options in old style */ 468 if (np->rxopt.bits.rxoinfo) { 469 struct in6_pktinfo src_info; 470 471 src_info.ipi6_ifindex = opt->iif; 472 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 473 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 474 } 475 if (np->rxopt.bits.rxohlim) { 476 int hlim = ipv6_hdr(skb)->hop_limit; 477 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 478 } 479 if (np->rxopt.bits.ohopopts && opt->hop) { 480 u8 *ptr = nh + opt->hop; 481 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 482 } 483 if (np->rxopt.bits.odstopts && opt->dst0) { 484 u8 *ptr = nh + opt->dst0; 485 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 486 } 487 if (np->rxopt.bits.osrcrt && opt->srcrt) { 488 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 489 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 490 } 491 if (np->rxopt.bits.odstopts && opt->dst1) { 492 u8 *ptr = nh + opt->dst1; 493 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 494 } 495 return 0; 496 } 497 498 int datagram_send_ctl(struct net *net, 499 struct msghdr *msg, struct flowi *fl, 500 struct ipv6_txoptions *opt, 501 int *hlimit, int *tclass) 502 { 503 struct in6_pktinfo *src_info; 504 struct cmsghdr *cmsg; 505 struct ipv6_rt_hdr *rthdr; 506 struct ipv6_opt_hdr *hdr; 507 int len; 508 int err = 0; 509 510 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 511 int addr_type; 512 513 if (!CMSG_OK(msg, cmsg)) { 514 err = -EINVAL; 515 goto exit_f; 516 } 517 518 if (cmsg->cmsg_level != SOL_IPV6) 519 continue; 520 521 switch (cmsg->cmsg_type) { 522 case IPV6_PKTINFO: 523 case IPV6_2292PKTINFO: 524 { 525 struct net_device *dev = NULL; 526 527 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 528 err = -EINVAL; 529 goto exit_f; 530 } 531 532 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 533 534 if (src_info->ipi6_ifindex) { 535 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 536 return -EINVAL; 537 fl->oif = src_info->ipi6_ifindex; 538 } 539 540 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 541 542 if (fl->oif) { 543 dev = dev_get_by_index(net, fl->oif); 544 if (!dev) 545 return -ENODEV; 546 } else if (addr_type & IPV6_ADDR_LINKLOCAL) 547 return -EINVAL; 548 549 if (addr_type != IPV6_ADDR_ANY) { 550 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 551 if (!ipv6_chk_addr(net, &src_info->ipi6_addr, 552 strict ? dev : NULL, 0)) 553 err = -EINVAL; 554 else 555 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 556 } 557 558 if (dev) 559 dev_put(dev); 560 561 if (err) 562 goto exit_f; 563 564 break; 565 } 566 567 case IPV6_FLOWINFO: 568 if (cmsg->cmsg_len < CMSG_LEN(4)) { 569 err = -EINVAL; 570 goto exit_f; 571 } 572 573 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 574 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 575 err = -EINVAL; 576 goto exit_f; 577 } 578 } 579 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 580 break; 581 582 case IPV6_2292HOPOPTS: 583 case IPV6_HOPOPTS: 584 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 585 err = -EINVAL; 586 goto exit_f; 587 } 588 589 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 590 len = ((hdr->hdrlen + 1) << 3); 591 if (cmsg->cmsg_len < CMSG_LEN(len)) { 592 err = -EINVAL; 593 goto exit_f; 594 } 595 if (!capable(CAP_NET_RAW)) { 596 err = -EPERM; 597 goto exit_f; 598 } 599 opt->opt_nflen += len; 600 opt->hopopt = hdr; 601 break; 602 603 case IPV6_2292DSTOPTS: 604 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 605 err = -EINVAL; 606 goto exit_f; 607 } 608 609 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 610 len = ((hdr->hdrlen + 1) << 3); 611 if (cmsg->cmsg_len < CMSG_LEN(len)) { 612 err = -EINVAL; 613 goto exit_f; 614 } 615 if (!capable(CAP_NET_RAW)) { 616 err = -EPERM; 617 goto exit_f; 618 } 619 if (opt->dst1opt) { 620 err = -EINVAL; 621 goto exit_f; 622 } 623 opt->opt_flen += len; 624 opt->dst1opt = hdr; 625 break; 626 627 case IPV6_DSTOPTS: 628 case IPV6_RTHDRDSTOPTS: 629 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 630 err = -EINVAL; 631 goto exit_f; 632 } 633 634 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 635 len = ((hdr->hdrlen + 1) << 3); 636 if (cmsg->cmsg_len < CMSG_LEN(len)) { 637 err = -EINVAL; 638 goto exit_f; 639 } 640 if (!capable(CAP_NET_RAW)) { 641 err = -EPERM; 642 goto exit_f; 643 } 644 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 645 opt->opt_flen += len; 646 opt->dst1opt = hdr; 647 } else { 648 opt->opt_nflen += len; 649 opt->dst0opt = hdr; 650 } 651 break; 652 653 case IPV6_2292RTHDR: 654 case IPV6_RTHDR: 655 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 656 err = -EINVAL; 657 goto exit_f; 658 } 659 660 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 661 662 switch (rthdr->type) { 663 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 664 case IPV6_SRCRT_TYPE_2: 665 if (rthdr->hdrlen != 2 || 666 rthdr->segments_left != 1) { 667 err = -EINVAL; 668 goto exit_f; 669 } 670 break; 671 #endif 672 default: 673 err = -EINVAL; 674 goto exit_f; 675 } 676 677 len = ((rthdr->hdrlen + 1) << 3); 678 679 if (cmsg->cmsg_len < CMSG_LEN(len)) { 680 err = -EINVAL; 681 goto exit_f; 682 } 683 684 /* segments left must also match */ 685 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 686 err = -EINVAL; 687 goto exit_f; 688 } 689 690 opt->opt_nflen += len; 691 opt->srcrt = rthdr; 692 693 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 694 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 695 696 opt->opt_nflen += dsthdrlen; 697 opt->dst0opt = opt->dst1opt; 698 opt->dst1opt = NULL; 699 opt->opt_flen -= dsthdrlen; 700 } 701 702 break; 703 704 case IPV6_2292HOPLIMIT: 705 case IPV6_HOPLIMIT: 706 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 707 err = -EINVAL; 708 goto exit_f; 709 } 710 711 *hlimit = *(int *)CMSG_DATA(cmsg); 712 if (*hlimit < -1 || *hlimit > 0xff) { 713 err = -EINVAL; 714 goto exit_f; 715 } 716 717 break; 718 719 case IPV6_TCLASS: 720 { 721 int tc; 722 723 err = -EINVAL; 724 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 725 goto exit_f; 726 } 727 728 tc = *(int *)CMSG_DATA(cmsg); 729 if (tc < -1 || tc > 0xff) 730 goto exit_f; 731 732 err = 0; 733 *tclass = tc; 734 735 break; 736 } 737 default: 738 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 739 cmsg->cmsg_type); 740 err = -EINVAL; 741 goto exit_f; 742 } 743 } 744 745 exit_f: 746 return err; 747 } 748