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 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 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->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(&sin->sin6_addr, 0, 0, 332 htonl(0xffff), 333 *(__be32 *)(nh + serr->addr_offset)); 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(&sin->sin6_addr, 0, 0, 354 htonl(0xffff), ip_hdr(skb)->saddr); 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 if (fl->oif) { 542 dev = dev_get_by_index(net, fl->oif); 543 if (!dev) 544 return -ENODEV; 545 } else if (addr_type & IPV6_ADDR_LINKLOCAL) 546 return -EINVAL; 547 548 if (addr_type != IPV6_ADDR_ANY) { 549 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 550 if (!ipv6_chk_addr(net, &src_info->ipi6_addr, 551 strict ? dev : NULL, 0)) 552 err = -EINVAL; 553 else 554 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 555 } 556 557 if (dev) 558 dev_put(dev); 559 560 if (err) 561 goto exit_f; 562 563 break; 564 } 565 566 case IPV6_FLOWINFO: 567 if (cmsg->cmsg_len < CMSG_LEN(4)) { 568 err = -EINVAL; 569 goto exit_f; 570 } 571 572 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 573 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 574 err = -EINVAL; 575 goto exit_f; 576 } 577 } 578 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 579 break; 580 581 case IPV6_2292HOPOPTS: 582 case IPV6_HOPOPTS: 583 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 584 err = -EINVAL; 585 goto exit_f; 586 } 587 588 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 589 len = ((hdr->hdrlen + 1) << 3); 590 if (cmsg->cmsg_len < CMSG_LEN(len)) { 591 err = -EINVAL; 592 goto exit_f; 593 } 594 if (!capable(CAP_NET_RAW)) { 595 err = -EPERM; 596 goto exit_f; 597 } 598 opt->opt_nflen += len; 599 opt->hopopt = hdr; 600 break; 601 602 case IPV6_2292DSTOPTS: 603 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 604 err = -EINVAL; 605 goto exit_f; 606 } 607 608 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 609 len = ((hdr->hdrlen + 1) << 3); 610 if (cmsg->cmsg_len < CMSG_LEN(len)) { 611 err = -EINVAL; 612 goto exit_f; 613 } 614 if (!capable(CAP_NET_RAW)) { 615 err = -EPERM; 616 goto exit_f; 617 } 618 if (opt->dst1opt) { 619 err = -EINVAL; 620 goto exit_f; 621 } 622 opt->opt_flen += len; 623 opt->dst1opt = hdr; 624 break; 625 626 case IPV6_DSTOPTS: 627 case IPV6_RTHDRDSTOPTS: 628 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 629 err = -EINVAL; 630 goto exit_f; 631 } 632 633 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 634 len = ((hdr->hdrlen + 1) << 3); 635 if (cmsg->cmsg_len < CMSG_LEN(len)) { 636 err = -EINVAL; 637 goto exit_f; 638 } 639 if (!capable(CAP_NET_RAW)) { 640 err = -EPERM; 641 goto exit_f; 642 } 643 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 644 opt->opt_flen += len; 645 opt->dst1opt = hdr; 646 } else { 647 opt->opt_nflen += len; 648 opt->dst0opt = hdr; 649 } 650 break; 651 652 case IPV6_2292RTHDR: 653 case IPV6_RTHDR: 654 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 655 err = -EINVAL; 656 goto exit_f; 657 } 658 659 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 660 661 switch (rthdr->type) { 662 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 663 case IPV6_SRCRT_TYPE_2: 664 break; 665 #endif 666 default: 667 err = -EINVAL; 668 goto exit_f; 669 } 670 671 len = ((rthdr->hdrlen + 1) << 3); 672 673 if (cmsg->cmsg_len < CMSG_LEN(len)) { 674 err = -EINVAL; 675 goto exit_f; 676 } 677 678 /* segments left must also match */ 679 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 680 err = -EINVAL; 681 goto exit_f; 682 } 683 684 opt->opt_nflen += len; 685 opt->srcrt = rthdr; 686 687 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 688 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 689 690 opt->opt_nflen += dsthdrlen; 691 opt->dst0opt = opt->dst1opt; 692 opt->dst1opt = NULL; 693 opt->opt_flen -= dsthdrlen; 694 } 695 696 break; 697 698 case IPV6_2292HOPLIMIT: 699 case IPV6_HOPLIMIT: 700 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 701 err = -EINVAL; 702 goto exit_f; 703 } 704 705 *hlimit = *(int *)CMSG_DATA(cmsg); 706 if (*hlimit < -1 || *hlimit > 0xff) { 707 err = -EINVAL; 708 goto exit_f; 709 } 710 711 break; 712 713 case IPV6_TCLASS: 714 { 715 int tc; 716 717 err = -EINVAL; 718 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 719 goto exit_f; 720 } 721 722 tc = *(int *)CMSG_DATA(cmsg); 723 if (tc < -1 || tc > 0xff) 724 goto exit_f; 725 726 err = 0; 727 *tclass = tc; 728 729 break; 730 } 731 default: 732 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 733 cmsg->cmsg_type); 734 err = -EINVAL; 735 goto exit_f; 736 } 737 } 738 739 exit_f: 740 return err; 741 } 742