1 /* 2 * common UDP/RAW code 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $ 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #include <linux/capability.h> 17 #include <linux/errno.h> 18 #include <linux/types.h> 19 #include <linux/kernel.h> 20 #include <linux/interrupt.h> 21 #include <linux/socket.h> 22 #include <linux/sockios.h> 23 #include <linux/in6.h> 24 #include <linux/ipv6.h> 25 #include <linux/route.h> 26 27 #include <net/ipv6.h> 28 #include <net/ndisc.h> 29 #include <net/addrconf.h> 30 #include <net/transp_v6.h> 31 #include <net/ip6_route.h> 32 #include <net/tcp_states.h> 33 34 #include <linux/errqueue.h> 35 #include <asm/uaccess.h> 36 37 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 38 { 39 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 40 struct inet_sock *inet = inet_sk(sk); 41 struct ipv6_pinfo *np = inet6_sk(sk); 42 struct in6_addr *daddr, *final_p = NULL, final; 43 struct dst_entry *dst; 44 struct flowi fl; 45 struct ip6_flowlabel *flowlabel = NULL; 46 int addr_type; 47 int err; 48 49 if (usin->sin6_family == AF_INET) { 50 if (__ipv6_only_sock(sk)) 51 return -EAFNOSUPPORT; 52 err = ip4_datagram_connect(sk, uaddr, addr_len); 53 goto ipv4_connected; 54 } 55 56 if (addr_len < SIN6_LEN_RFC2133) 57 return -EINVAL; 58 59 if (usin->sin6_family != AF_INET6) 60 return -EAFNOSUPPORT; 61 62 memset(&fl, 0, sizeof(fl)); 63 if (np->sndflow) { 64 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 65 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 66 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 67 if (flowlabel == NULL) 68 return -EINVAL; 69 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 70 } 71 } 72 73 addr_type = ipv6_addr_type(&usin->sin6_addr); 74 75 if (addr_type == IPV6_ADDR_ANY) { 76 /* 77 * connect to self 78 */ 79 usin->sin6_addr.s6_addr[15] = 0x01; 80 } 81 82 daddr = &usin->sin6_addr; 83 84 if (addr_type == IPV6_ADDR_MAPPED) { 85 struct sockaddr_in sin; 86 87 if (__ipv6_only_sock(sk)) { 88 err = -ENETUNREACH; 89 goto out; 90 } 91 sin.sin_family = AF_INET; 92 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 93 sin.sin_port = usin->sin6_port; 94 95 err = ip4_datagram_connect(sk, 96 (struct sockaddr*) &sin, 97 sizeof(sin)); 98 99 ipv4_connected: 100 if (err) 101 goto out; 102 103 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr); 104 105 if (ipv6_addr_any(&np->saddr)) { 106 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff), 107 inet->saddr); 108 } 109 110 if (ipv6_addr_any(&np->rcv_saddr)) { 111 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff), 112 inet->rcv_saddr); 113 } 114 goto out; 115 } 116 117 if (addr_type&IPV6_ADDR_LINKLOCAL) { 118 if (addr_len >= sizeof(struct sockaddr_in6) && 119 usin->sin6_scope_id) { 120 if (sk->sk_bound_dev_if && 121 sk->sk_bound_dev_if != usin->sin6_scope_id) { 122 err = -EINVAL; 123 goto out; 124 } 125 sk->sk_bound_dev_if = usin->sin6_scope_id; 126 if (!sk->sk_bound_dev_if && 127 (addr_type & IPV6_ADDR_MULTICAST)) 128 fl.oif = np->mcast_oif; 129 } 130 131 /* Connect to link-local address requires an interface */ 132 if (!sk->sk_bound_dev_if) { 133 err = -EINVAL; 134 goto out; 135 } 136 } 137 138 ipv6_addr_copy(&np->daddr, daddr); 139 np->flow_label = fl.fl6_flowlabel; 140 141 inet->dport = usin->sin6_port; 142 143 /* 144 * Check for a route to destination an obtain the 145 * destination cache for it. 146 */ 147 148 fl.proto = sk->sk_protocol; 149 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 150 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 151 fl.oif = sk->sk_bound_dev_if; 152 fl.fl_ip_dport = inet->dport; 153 fl.fl_ip_sport = inet->sport; 154 155 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) 156 fl.oif = np->mcast_oif; 157 158 security_sk_classify_flow(sk, &fl); 159 160 if (flowlabel) { 161 if (flowlabel->opt && flowlabel->opt->srcrt) { 162 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; 163 ipv6_addr_copy(&final, &fl.fl6_dst); 164 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 165 final_p = &final; 166 } 167 } else if (np->opt && np->opt->srcrt) { 168 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 169 ipv6_addr_copy(&final, &fl.fl6_dst); 170 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 171 final_p = &final; 172 } 173 174 err = ip6_dst_lookup(sk, &dst, &fl); 175 if (err) 176 goto out; 177 if (final_p) 178 ipv6_addr_copy(&fl.fl6_dst, final_p); 179 180 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0) 181 goto out; 182 183 /* source address lookup done in ip6_dst_lookup */ 184 185 if (ipv6_addr_any(&np->saddr)) 186 ipv6_addr_copy(&np->saddr, &fl.fl6_src); 187 188 if (ipv6_addr_any(&np->rcv_saddr)) { 189 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); 190 inet->rcv_saddr = LOOPBACK4_IPV6; 191 } 192 193 ip6_dst_store(sk, dst, 194 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 195 &np->daddr : NULL, 196 #ifdef CONFIG_IPV6_SUBTREES 197 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 198 &np->saddr : 199 #endif 200 NULL); 201 202 sk->sk_state = TCP_ESTABLISHED; 203 out: 204 fl6_sock_release(flowlabel); 205 return err; 206 } 207 208 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 209 __be16 port, u32 info, u8 *payload) 210 { 211 struct ipv6_pinfo *np = inet6_sk(sk); 212 struct icmp6hdr *icmph = icmp6_hdr(skb); 213 struct sock_exterr_skb *serr; 214 215 if (!np->recverr) 216 return; 217 218 skb = skb_clone(skb, GFP_ATOMIC); 219 if (!skb) 220 return; 221 222 serr = SKB_EXT_ERR(skb); 223 serr->ee.ee_errno = err; 224 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 225 serr->ee.ee_type = icmph->icmp6_type; 226 serr->ee.ee_code = icmph->icmp6_code; 227 serr->ee.ee_pad = 0; 228 serr->ee.ee_info = info; 229 serr->ee.ee_data = 0; 230 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 231 skb_network_header(skb); 232 serr->port = port; 233 234 __skb_pull(skb, payload - skb->data); 235 skb_reset_transport_header(skb); 236 237 if (sock_queue_err_skb(sk, skb)) 238 kfree_skb(skb); 239 } 240 241 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 242 { 243 struct ipv6_pinfo *np = inet6_sk(sk); 244 struct sock_exterr_skb *serr; 245 struct ipv6hdr *iph; 246 struct sk_buff *skb; 247 248 if (!np->recverr) 249 return; 250 251 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 252 if (!skb) 253 return; 254 255 skb_put(skb, sizeof(struct ipv6hdr)); 256 skb_reset_network_header(skb); 257 iph = ipv6_hdr(skb); 258 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 259 260 serr = SKB_EXT_ERR(skb); 261 serr->ee.ee_errno = err; 262 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 263 serr->ee.ee_type = 0; 264 serr->ee.ee_code = 0; 265 serr->ee.ee_pad = 0; 266 serr->ee.ee_info = info; 267 serr->ee.ee_data = 0; 268 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 269 serr->port = fl->fl_ip_dport; 270 271 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 272 skb_reset_transport_header(skb); 273 274 if (sock_queue_err_skb(sk, skb)) 275 kfree_skb(skb); 276 } 277 278 /* 279 * Handle MSG_ERRQUEUE 280 */ 281 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 282 { 283 struct ipv6_pinfo *np = inet6_sk(sk); 284 struct sock_exterr_skb *serr; 285 struct sk_buff *skb, *skb2; 286 struct sockaddr_in6 *sin; 287 struct { 288 struct sock_extended_err ee; 289 struct sockaddr_in6 offender; 290 } errhdr; 291 int err; 292 int copied; 293 294 err = -EAGAIN; 295 skb = skb_dequeue(&sk->sk_error_queue); 296 if (skb == NULL) 297 goto out; 298 299 copied = skb->len; 300 if (copied > len) { 301 msg->msg_flags |= MSG_TRUNC; 302 copied = len; 303 } 304 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 305 if (err) 306 goto out_free_skb; 307 308 sock_recv_timestamp(msg, sk, skb); 309 310 serr = SKB_EXT_ERR(skb); 311 312 sin = (struct sockaddr_in6 *)msg->msg_name; 313 if (sin) { 314 const unsigned char *nh = skb_network_header(skb); 315 sin->sin6_family = AF_INET6; 316 sin->sin6_flowinfo = 0; 317 sin->sin6_port = serr->port; 318 sin->sin6_scope_id = 0; 319 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 320 ipv6_addr_copy(&sin->sin6_addr, 321 (struct in6_addr *)(nh + serr->addr_offset)); 322 if (np->sndflow) 323 sin->sin6_flowinfo = 324 (*(__be32 *)(nh + serr->addr_offset - 24) & 325 IPV6_FLOWINFO_MASK); 326 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 327 sin->sin6_scope_id = IP6CB(skb)->iif; 328 } else { 329 ipv6_addr_set(&sin->sin6_addr, 0, 0, 330 htonl(0xffff), 331 *(__be32 *)(nh + serr->addr_offset)); 332 } 333 } 334 335 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 336 sin = &errhdr.offender; 337 sin->sin6_family = AF_UNSPEC; 338 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 339 sin->sin6_family = AF_INET6; 340 sin->sin6_flowinfo = 0; 341 sin->sin6_scope_id = 0; 342 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 343 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); 344 if (np->rxopt.all) 345 datagram_recv_ctl(sk, msg, skb); 346 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 347 sin->sin6_scope_id = IP6CB(skb)->iif; 348 } else { 349 struct inet_sock *inet = inet_sk(sk); 350 351 ipv6_addr_set(&sin->sin6_addr, 0, 0, 352 htonl(0xffff), ip_hdr(skb)->saddr); 353 if (inet->cmsg_flags) 354 ip_cmsg_recv(msg, skb); 355 } 356 } 357 358 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 359 360 /* Now we could try to dump offended packet options */ 361 362 msg->msg_flags |= MSG_ERRQUEUE; 363 err = copied; 364 365 /* Reset and regenerate socket error */ 366 spin_lock_bh(&sk->sk_error_queue.lock); 367 sk->sk_err = 0; 368 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 369 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 370 spin_unlock_bh(&sk->sk_error_queue.lock); 371 sk->sk_error_report(sk); 372 } else { 373 spin_unlock_bh(&sk->sk_error_queue.lock); 374 } 375 376 out_free_skb: 377 kfree_skb(skb); 378 out: 379 return err; 380 } 381 382 383 384 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 385 { 386 struct ipv6_pinfo *np = inet6_sk(sk); 387 struct inet6_skb_parm *opt = IP6CB(skb); 388 unsigned char *nh = skb_network_header(skb); 389 390 if (np->rxopt.bits.rxinfo) { 391 struct in6_pktinfo src_info; 392 393 src_info.ipi6_ifindex = opt->iif; 394 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 395 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 396 } 397 398 if (np->rxopt.bits.rxhlim) { 399 int hlim = ipv6_hdr(skb)->hop_limit; 400 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 401 } 402 403 if (np->rxopt.bits.rxtclass) { 404 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; 405 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 406 } 407 408 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 409 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 410 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 411 } 412 413 /* HbH is allowed only once */ 414 if (np->rxopt.bits.hopopts && opt->hop) { 415 u8 *ptr = nh + opt->hop; 416 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 417 } 418 419 if (opt->lastopt && 420 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 421 /* 422 * Silly enough, but we need to reparse in order to 423 * report extension headers (except for HbH) 424 * in order. 425 * 426 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 427 * (and WILL NOT be) defined because 428 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 429 */ 430 unsigned int off = sizeof(struct ipv6hdr); 431 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 432 433 while (off <= opt->lastopt) { 434 unsigned len; 435 u8 *ptr = nh + off; 436 437 switch(nexthdr) { 438 case IPPROTO_DSTOPTS: 439 nexthdr = ptr[0]; 440 len = (ptr[1] + 1) << 3; 441 if (np->rxopt.bits.dstopts) 442 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 443 break; 444 case IPPROTO_ROUTING: 445 nexthdr = ptr[0]; 446 len = (ptr[1] + 1) << 3; 447 if (np->rxopt.bits.srcrt) 448 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 449 break; 450 case IPPROTO_AH: 451 nexthdr = ptr[0]; 452 len = (ptr[1] + 2) << 2; 453 break; 454 default: 455 nexthdr = ptr[0]; 456 len = (ptr[1] + 1) << 3; 457 break; 458 } 459 460 off += len; 461 } 462 } 463 464 /* socket options in old style */ 465 if (np->rxopt.bits.rxoinfo) { 466 struct in6_pktinfo src_info; 467 468 src_info.ipi6_ifindex = opt->iif; 469 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); 470 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 471 } 472 if (np->rxopt.bits.rxohlim) { 473 int hlim = ipv6_hdr(skb)->hop_limit; 474 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 475 } 476 if (np->rxopt.bits.ohopopts && opt->hop) { 477 u8 *ptr = nh + opt->hop; 478 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 479 } 480 if (np->rxopt.bits.odstopts && opt->dst0) { 481 u8 *ptr = nh + opt->dst0; 482 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 483 } 484 if (np->rxopt.bits.osrcrt && opt->srcrt) { 485 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 486 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 487 } 488 if (np->rxopt.bits.odstopts && opt->dst1) { 489 u8 *ptr = nh + opt->dst1; 490 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 491 } 492 return 0; 493 } 494 495 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, 496 struct ipv6_txoptions *opt, 497 int *hlimit, int *tclass) 498 { 499 struct in6_pktinfo *src_info; 500 struct cmsghdr *cmsg; 501 struct ipv6_rt_hdr *rthdr; 502 struct ipv6_opt_hdr *hdr; 503 int len; 504 int err = 0; 505 506 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 507 int addr_type; 508 struct net_device *dev = NULL; 509 510 if (!CMSG_OK(msg, cmsg)) { 511 err = -EINVAL; 512 goto exit_f; 513 } 514 515 if (cmsg->cmsg_level != SOL_IPV6) 516 continue; 517 518 switch (cmsg->cmsg_type) { 519 case IPV6_PKTINFO: 520 case IPV6_2292PKTINFO: 521 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 522 err = -EINVAL; 523 goto exit_f; 524 } 525 526 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 527 528 if (src_info->ipi6_ifindex) { 529 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 530 return -EINVAL; 531 fl->oif = src_info->ipi6_ifindex; 532 } 533 534 addr_type = ipv6_addr_type(&src_info->ipi6_addr); 535 536 if (addr_type == IPV6_ADDR_ANY) 537 break; 538 539 if (addr_type & IPV6_ADDR_LINKLOCAL) { 540 if (!src_info->ipi6_ifindex) 541 return -EINVAL; 542 else { 543 dev = dev_get_by_index(src_info->ipi6_ifindex); 544 if (!dev) 545 return -ENODEV; 546 } 547 } 548 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { 549 if (dev) 550 dev_put(dev); 551 err = -EINVAL; 552 goto exit_f; 553 } 554 if (dev) 555 dev_put(dev); 556 557 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 558 break; 559 560 case IPV6_FLOWINFO: 561 if (cmsg->cmsg_len < CMSG_LEN(4)) { 562 err = -EINVAL; 563 goto exit_f; 564 } 565 566 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 567 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 568 err = -EINVAL; 569 goto exit_f; 570 } 571 } 572 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 573 break; 574 575 case IPV6_2292HOPOPTS: 576 case IPV6_HOPOPTS: 577 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 578 err = -EINVAL; 579 goto exit_f; 580 } 581 582 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 583 len = ((hdr->hdrlen + 1) << 3); 584 if (cmsg->cmsg_len < CMSG_LEN(len)) { 585 err = -EINVAL; 586 goto exit_f; 587 } 588 if (!capable(CAP_NET_RAW)) { 589 err = -EPERM; 590 goto exit_f; 591 } 592 opt->opt_nflen += len; 593 opt->hopopt = hdr; 594 break; 595 596 case IPV6_2292DSTOPTS: 597 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 598 err = -EINVAL; 599 goto exit_f; 600 } 601 602 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 603 len = ((hdr->hdrlen + 1) << 3); 604 if (cmsg->cmsg_len < CMSG_LEN(len)) { 605 err = -EINVAL; 606 goto exit_f; 607 } 608 if (!capable(CAP_NET_RAW)) { 609 err = -EPERM; 610 goto exit_f; 611 } 612 if (opt->dst1opt) { 613 err = -EINVAL; 614 goto exit_f; 615 } 616 opt->opt_flen += len; 617 opt->dst1opt = hdr; 618 break; 619 620 case IPV6_DSTOPTS: 621 case IPV6_RTHDRDSTOPTS: 622 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 623 err = -EINVAL; 624 goto exit_f; 625 } 626 627 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 628 len = ((hdr->hdrlen + 1) << 3); 629 if (cmsg->cmsg_len < CMSG_LEN(len)) { 630 err = -EINVAL; 631 goto exit_f; 632 } 633 if (!capable(CAP_NET_RAW)) { 634 err = -EPERM; 635 goto exit_f; 636 } 637 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 638 opt->opt_flen += len; 639 opt->dst1opt = hdr; 640 } else { 641 opt->opt_nflen += len; 642 opt->dst0opt = hdr; 643 } 644 break; 645 646 case IPV6_2292RTHDR: 647 case IPV6_RTHDR: 648 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 649 err = -EINVAL; 650 goto exit_f; 651 } 652 653 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 654 655 switch (rthdr->type) { 656 case IPV6_SRCRT_TYPE_0: 657 #ifdef CONFIG_IPV6_MIP6 658 case IPV6_SRCRT_TYPE_2: 659 #endif 660 break; 661 default: 662 err = -EINVAL; 663 goto exit_f; 664 } 665 666 len = ((rthdr->hdrlen + 1) << 3); 667 668 if (cmsg->cmsg_len < CMSG_LEN(len)) { 669 err = -EINVAL; 670 goto exit_f; 671 } 672 673 /* segments left must also match */ 674 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 675 err = -EINVAL; 676 goto exit_f; 677 } 678 679 opt->opt_nflen += len; 680 opt->srcrt = rthdr; 681 682 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 683 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 684 685 opt->opt_nflen += dsthdrlen; 686 opt->dst0opt = opt->dst1opt; 687 opt->dst1opt = NULL; 688 opt->opt_flen -= dsthdrlen; 689 } 690 691 break; 692 693 case IPV6_2292HOPLIMIT: 694 case IPV6_HOPLIMIT: 695 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 696 err = -EINVAL; 697 goto exit_f; 698 } 699 700 *hlimit = *(int *)CMSG_DATA(cmsg); 701 break; 702 703 case IPV6_TCLASS: 704 { 705 int tc; 706 707 err = -EINVAL; 708 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 709 goto exit_f; 710 } 711 712 tc = *(int *)CMSG_DATA(cmsg); 713 if (tc < -1 || tc > 0xff) 714 goto exit_f; 715 716 err = 0; 717 *tclass = tc; 718 719 break; 720 } 721 default: 722 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 723 cmsg->cmsg_type); 724 err = -EINVAL; 725 break; 726 } 727 } 728 729 exit_f: 730 return err; 731 } 732