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/sched.h> 21 #include <linux/interrupt.h> 22 #include <linux/socket.h> 23 #include <linux/sockios.h> 24 #include <linux/in6.h> 25 #include <linux/ipv6.h> 26 #include <linux/route.h> 27 28 #include <net/ipv6.h> 29 #include <net/ndisc.h> 30 #include <net/addrconf.h> 31 #include <net/transp_v6.h> 32 #include <net/ip6_route.h> 33 #include <net/tcp_states.h> 34 35 #include <linux/errqueue.h> 36 #include <asm/uaccess.h> 37 38 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 39 { 40 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 41 struct inet_sock *inet = inet_sk(sk); 42 struct ipv6_pinfo *np = inet6_sk(sk); 43 struct in6_addr *daddr, *final_p = NULL, final; 44 struct dst_entry *dst; 45 struct flowi fl; 46 struct ip6_flowlabel *flowlabel = NULL; 47 int addr_type; 48 int err; 49 50 if (usin->sin6_family == AF_INET) { 51 if (__ipv6_only_sock(sk)) 52 return -EAFNOSUPPORT; 53 err = ip4_datagram_connect(sk, uaddr, addr_len); 54 goto ipv4_connected; 55 } 56 57 if (addr_len < SIN6_LEN_RFC2133) 58 return -EINVAL; 59 60 if (usin->sin6_family != AF_INET6) 61 return -EAFNOSUPPORT; 62 63 memset(&fl, 0, sizeof(fl)); 64 if (np->sndflow) { 65 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 66 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 67 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 68 if (flowlabel == NULL) 69 return -EINVAL; 70 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); 71 } 72 } 73 74 addr_type = ipv6_addr_type(&usin->sin6_addr); 75 76 if (addr_type == IPV6_ADDR_ANY) { 77 /* 78 * connect to self 79 */ 80 usin->sin6_addr.s6_addr[15] = 0x01; 81 } 82 83 daddr = &usin->sin6_addr; 84 85 if (addr_type == IPV6_ADDR_MAPPED) { 86 struct sockaddr_in sin; 87 88 if (__ipv6_only_sock(sk)) { 89 err = -ENETUNREACH; 90 goto out; 91 } 92 sin.sin_family = AF_INET; 93 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 94 sin.sin_port = usin->sin6_port; 95 96 err = ip4_datagram_connect(sk, 97 (struct sockaddr*) &sin, 98 sizeof(sin)); 99 100 ipv4_connected: 101 if (err) 102 goto out; 103 104 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr); 105 106 if (ipv6_addr_any(&np->saddr)) { 107 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff), 108 inet->saddr); 109 } 110 111 if (ipv6_addr_any(&np->rcv_saddr)) { 112 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff), 113 inet->rcv_saddr); 114 } 115 goto out; 116 } 117 118 if (addr_type&IPV6_ADDR_LINKLOCAL) { 119 if (addr_len >= sizeof(struct sockaddr_in6) && 120 usin->sin6_scope_id) { 121 if (sk->sk_bound_dev_if && 122 sk->sk_bound_dev_if != usin->sin6_scope_id) { 123 err = -EINVAL; 124 goto out; 125 } 126 sk->sk_bound_dev_if = usin->sin6_scope_id; 127 if (!sk->sk_bound_dev_if && 128 (addr_type & IPV6_ADDR_MULTICAST)) 129 fl.oif = np->mcast_oif; 130 } 131 132 /* Connect to link-local address requires an interface */ 133 if (!sk->sk_bound_dev_if) { 134 err = -EINVAL; 135 goto out; 136 } 137 } 138 139 ipv6_addr_copy(&np->daddr, daddr); 140 np->flow_label = fl.fl6_flowlabel; 141 142 inet->dport = usin->sin6_port; 143 144 /* 145 * Check for a route to destination an obtain the 146 * destination cache for it. 147 */ 148 149 fl.proto = sk->sk_protocol; 150 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 151 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 152 fl.oif = sk->sk_bound_dev_if; 153 fl.fl_ip_dport = inet->dport; 154 fl.fl_ip_sport = inet->sport; 155 156 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST)) 157 fl.oif = np->mcast_oif; 158 159 if (flowlabel) { 160 if (flowlabel->opt && flowlabel->opt->srcrt) { 161 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt; 162 ipv6_addr_copy(&final, &fl.fl6_dst); 163 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 164 final_p = &final; 165 } 166 } else if (np->opt && np->opt->srcrt) { 167 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; 168 ipv6_addr_copy(&final, &fl.fl6_dst); 169 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 170 final_p = &final; 171 } 172 173 err = ip6_dst_lookup(sk, &dst, &fl); 174 if (err) 175 goto out; 176 if (final_p) 177 ipv6_addr_copy(&fl.fl6_dst, final_p); 178 179 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 180 goto out; 181 182 /* source address lookup done in ip6_dst_lookup */ 183 184 if (ipv6_addr_any(&np->saddr)) 185 ipv6_addr_copy(&np->saddr, &fl.fl6_src); 186 187 if (ipv6_addr_any(&np->rcv_saddr)) { 188 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); 189 inet->rcv_saddr = LOOPBACK4_IPV6; 190 } 191 192 ip6_dst_store(sk, dst, 193 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 194 &np->daddr : NULL); 195 196 sk->sk_state = TCP_ESTABLISHED; 197 out: 198 fl6_sock_release(flowlabel); 199 return err; 200 } 201 202 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 203 u16 port, u32 info, u8 *payload) 204 { 205 struct ipv6_pinfo *np = inet6_sk(sk); 206 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw; 207 struct sock_exterr_skb *serr; 208 209 if (!np->recverr) 210 return; 211 212 skb = skb_clone(skb, GFP_ATOMIC); 213 if (!skb) 214 return; 215 216 serr = SKB_EXT_ERR(skb); 217 serr->ee.ee_errno = err; 218 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 219 serr->ee.ee_type = icmph->icmp6_type; 220 serr->ee.ee_code = icmph->icmp6_code; 221 serr->ee.ee_pad = 0; 222 serr->ee.ee_info = info; 223 serr->ee.ee_data = 0; 224 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw; 225 serr->port = port; 226 227 skb->h.raw = payload; 228 __skb_pull(skb, payload - skb->data); 229 230 if (sock_queue_err_skb(sk, skb)) 231 kfree_skb(skb); 232 } 233 234 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 235 { 236 struct ipv6_pinfo *np = inet6_sk(sk); 237 struct sock_exterr_skb *serr; 238 struct ipv6hdr *iph; 239 struct sk_buff *skb; 240 241 if (!np->recverr) 242 return; 243 244 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 245 if (!skb) 246 return; 247 248 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr)); 249 skb->nh.ipv6h = iph; 250 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 251 252 serr = SKB_EXT_ERR(skb); 253 serr->ee.ee_errno = err; 254 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 255 serr->ee.ee_type = 0; 256 serr->ee.ee_code = 0; 257 serr->ee.ee_pad = 0; 258 serr->ee.ee_info = info; 259 serr->ee.ee_data = 0; 260 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; 261 serr->port = fl->fl_ip_dport; 262 263 skb->h.raw = skb->tail; 264 __skb_pull(skb, skb->tail - skb->data); 265 266 if (sock_queue_err_skb(sk, skb)) 267 kfree_skb(skb); 268 } 269 270 /* 271 * Handle MSG_ERRQUEUE 272 */ 273 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 274 { 275 struct ipv6_pinfo *np = inet6_sk(sk); 276 struct sock_exterr_skb *serr; 277 struct sk_buff *skb, *skb2; 278 struct sockaddr_in6 *sin; 279 struct { 280 struct sock_extended_err ee; 281 struct sockaddr_in6 offender; 282 } errhdr; 283 int err; 284 int copied; 285 286 err = -EAGAIN; 287 skb = skb_dequeue(&sk->sk_error_queue); 288 if (skb == NULL) 289 goto out; 290 291 copied = skb->len; 292 if (copied > len) { 293 msg->msg_flags |= MSG_TRUNC; 294 copied = len; 295 } 296 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 297 if (err) 298 goto out_free_skb; 299 300 sock_recv_timestamp(msg, sk, skb); 301 302 serr = SKB_EXT_ERR(skb); 303 304 sin = (struct sockaddr_in6 *)msg->msg_name; 305 if (sin) { 306 sin->sin6_family = AF_INET6; 307 sin->sin6_flowinfo = 0; 308 sin->sin6_port = serr->port; 309 sin->sin6_scope_id = 0; 310 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 311 ipv6_addr_copy(&sin->sin6_addr, 312 (struct in6_addr *)(skb->nh.raw + serr->addr_offset)); 313 if (np->sndflow) 314 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK; 315 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 316 sin->sin6_scope_id = IP6CB(skb)->iif; 317 } else { 318 ipv6_addr_set(&sin->sin6_addr, 0, 0, 319 htonl(0xffff), 320 *(u32*)(skb->nh.raw + serr->addr_offset)); 321 } 322 } 323 324 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 325 sin = &errhdr.offender; 326 sin->sin6_family = AF_UNSPEC; 327 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 328 sin->sin6_family = AF_INET6; 329 sin->sin6_flowinfo = 0; 330 sin->sin6_scope_id = 0; 331 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 332 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr); 333 if (np->rxopt.all) 334 datagram_recv_ctl(sk, msg, skb); 335 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 336 sin->sin6_scope_id = IP6CB(skb)->iif; 337 } else { 338 struct inet_sock *inet = inet_sk(sk); 339 340 ipv6_addr_set(&sin->sin6_addr, 0, 0, 341 htonl(0xffff), 342 skb->nh.iph->saddr); 343 if (inet->cmsg_flags) 344 ip_cmsg_recv(msg, skb); 345 } 346 } 347 348 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 349 350 /* Now we could try to dump offended packet options */ 351 352 msg->msg_flags |= MSG_ERRQUEUE; 353 err = copied; 354 355 /* Reset and regenerate socket error */ 356 spin_lock_bh(&sk->sk_error_queue.lock); 357 sk->sk_err = 0; 358 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 359 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 360 spin_unlock_bh(&sk->sk_error_queue.lock); 361 sk->sk_error_report(sk); 362 } else { 363 spin_unlock_bh(&sk->sk_error_queue.lock); 364 } 365 366 out_free_skb: 367 kfree_skb(skb); 368 out: 369 return err; 370 } 371 372 373 374 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 375 { 376 struct ipv6_pinfo *np = inet6_sk(sk); 377 struct inet6_skb_parm *opt = IP6CB(skb); 378 379 if (np->rxopt.bits.rxinfo) { 380 struct in6_pktinfo src_info; 381 382 src_info.ipi6_ifindex = opt->iif; 383 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 384 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 385 } 386 387 if (np->rxopt.bits.rxhlim) { 388 int hlim = skb->nh.ipv6h->hop_limit; 389 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 390 } 391 392 if (np->rxopt.bits.rxtclass) { 393 int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff; 394 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 395 } 396 397 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) { 398 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK; 399 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 400 } 401 402 /* HbH is allowed only once */ 403 if (np->rxopt.bits.hopopts && opt->hop) { 404 u8 *ptr = skb->nh.raw + opt->hop; 405 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 406 } 407 408 if (opt->lastopt && 409 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 410 /* 411 * Silly enough, but we need to reparse in order to 412 * report extension headers (except for HbH) 413 * in order. 414 * 415 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 416 * (and WILL NOT be) defined because 417 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 418 */ 419 unsigned int off = sizeof(struct ipv6hdr); 420 u8 nexthdr = skb->nh.ipv6h->nexthdr; 421 422 while (off <= opt->lastopt) { 423 unsigned len; 424 u8 *ptr = skb->nh.raw + off; 425 426 switch(nexthdr) { 427 case IPPROTO_DSTOPTS: 428 nexthdr = ptr[0]; 429 len = (ptr[1] + 1) << 3; 430 if (np->rxopt.bits.dstopts) 431 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 432 break; 433 case IPPROTO_ROUTING: 434 nexthdr = ptr[0]; 435 len = (ptr[1] + 1) << 3; 436 if (np->rxopt.bits.srcrt) 437 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 438 break; 439 case IPPROTO_AH: 440 nexthdr = ptr[0]; 441 len = (ptr[1] + 2) << 2; 442 break; 443 default: 444 nexthdr = ptr[0]; 445 len = (ptr[1] + 1) << 3; 446 break; 447 } 448 449 off += len; 450 } 451 } 452 453 /* socket options in old style */ 454 if (np->rxopt.bits.rxoinfo) { 455 struct in6_pktinfo src_info; 456 457 src_info.ipi6_ifindex = opt->iif; 458 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 459 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 460 } 461 if (np->rxopt.bits.rxohlim) { 462 int hlim = skb->nh.ipv6h->hop_limit; 463 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 464 } 465 if (np->rxopt.bits.ohopopts && opt->hop) { 466 u8 *ptr = skb->nh.raw + opt->hop; 467 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 468 } 469 if (np->rxopt.bits.odstopts && opt->dst0) { 470 u8 *ptr = skb->nh.raw + opt->dst0; 471 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 472 } 473 if (np->rxopt.bits.osrcrt && opt->srcrt) { 474 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt); 475 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 476 } 477 if (np->rxopt.bits.odstopts && opt->dst1) { 478 u8 *ptr = skb->nh.raw + opt->dst1; 479 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 480 } 481 return 0; 482 } 483 484 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, 485 struct ipv6_txoptions *opt, 486 int *hlimit, int *tclass) 487 { 488 struct in6_pktinfo *src_info; 489 struct cmsghdr *cmsg; 490 struct ipv6_rt_hdr *rthdr; 491 struct ipv6_opt_hdr *hdr; 492 int len; 493 int err = 0; 494 495 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 496 int addr_type; 497 struct net_device *dev = NULL; 498 499 if (!CMSG_OK(msg, cmsg)) { 500 err = -EINVAL; 501 goto exit_f; 502 } 503 504 if (cmsg->cmsg_level != SOL_IPV6) 505 continue; 506 507 switch (cmsg->cmsg_type) { 508 case IPV6_PKTINFO: 509 case IPV6_2292PKTINFO: 510 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 511 err = -EINVAL; 512 goto exit_f; 513 } 514 515 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 516 517 if (src_info->ipi6_ifindex) { 518 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 519 return -EINVAL; 520 fl->oif = src_info->ipi6_ifindex; 521 } 522 523 addr_type = ipv6_addr_type(&src_info->ipi6_addr); 524 525 if (addr_type == IPV6_ADDR_ANY) 526 break; 527 528 if (addr_type & IPV6_ADDR_LINKLOCAL) { 529 if (!src_info->ipi6_ifindex) 530 return -EINVAL; 531 else { 532 dev = dev_get_by_index(src_info->ipi6_ifindex); 533 if (!dev) 534 return -ENODEV; 535 } 536 } 537 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { 538 if (dev) 539 dev_put(dev); 540 err = -EINVAL; 541 goto exit_f; 542 } 543 if (dev) 544 dev_put(dev); 545 546 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 547 break; 548 549 case IPV6_FLOWINFO: 550 if (cmsg->cmsg_len < CMSG_LEN(4)) { 551 err = -EINVAL; 552 goto exit_f; 553 } 554 555 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 556 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 557 err = -EINVAL; 558 goto exit_f; 559 } 560 } 561 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg); 562 break; 563 564 case IPV6_2292HOPOPTS: 565 case IPV6_HOPOPTS: 566 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 567 err = -EINVAL; 568 goto exit_f; 569 } 570 571 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 572 len = ((hdr->hdrlen + 1) << 3); 573 if (cmsg->cmsg_len < CMSG_LEN(len)) { 574 err = -EINVAL; 575 goto exit_f; 576 } 577 if (!capable(CAP_NET_RAW)) { 578 err = -EPERM; 579 goto exit_f; 580 } 581 opt->opt_nflen += len; 582 opt->hopopt = hdr; 583 break; 584 585 case IPV6_2292DSTOPTS: 586 if (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 if (opt->dst1opt) { 602 err = -EINVAL; 603 goto exit_f; 604 } 605 opt->opt_flen += len; 606 opt->dst1opt = hdr; 607 break; 608 609 case IPV6_DSTOPTS: 610 case IPV6_RTHDRDSTOPTS: 611 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 612 err = -EINVAL; 613 goto exit_f; 614 } 615 616 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 617 len = ((hdr->hdrlen + 1) << 3); 618 if (cmsg->cmsg_len < CMSG_LEN(len)) { 619 err = -EINVAL; 620 goto exit_f; 621 } 622 if (!capable(CAP_NET_RAW)) { 623 err = -EPERM; 624 goto exit_f; 625 } 626 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 627 opt->opt_flen += len; 628 opt->dst1opt = hdr; 629 } else { 630 opt->opt_nflen += len; 631 opt->dst0opt = hdr; 632 } 633 break; 634 635 case IPV6_2292RTHDR: 636 case IPV6_RTHDR: 637 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 638 err = -EINVAL; 639 goto exit_f; 640 } 641 642 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 643 644 /* 645 * TYPE 0 646 */ 647 if (rthdr->type) { 648 err = -EINVAL; 649 goto exit_f; 650 } 651 652 len = ((rthdr->hdrlen + 1) << 3); 653 654 if (cmsg->cmsg_len < CMSG_LEN(len)) { 655 err = -EINVAL; 656 goto exit_f; 657 } 658 659 /* segments left must also match */ 660 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 661 err = -EINVAL; 662 goto exit_f; 663 } 664 665 opt->opt_nflen += len; 666 opt->srcrt = rthdr; 667 668 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 669 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 670 671 opt->opt_nflen += dsthdrlen; 672 opt->dst0opt = opt->dst1opt; 673 opt->dst1opt = NULL; 674 opt->opt_flen -= dsthdrlen; 675 } 676 677 break; 678 679 case IPV6_2292HOPLIMIT: 680 case IPV6_HOPLIMIT: 681 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 682 err = -EINVAL; 683 goto exit_f; 684 } 685 686 *hlimit = *(int *)CMSG_DATA(cmsg); 687 break; 688 689 case IPV6_TCLASS: 690 { 691 int tc; 692 693 err = -EINVAL; 694 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 695 goto exit_f; 696 } 697 698 tc = *(int *)CMSG_DATA(cmsg); 699 if (tc < -1 || tc > 0xff) 700 goto exit_f; 701 702 err = 0; 703 *tclass = tc; 704 705 break; 706 } 707 default: 708 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 709 cmsg->cmsg_type); 710 err = -EINVAL; 711 break; 712 }; 713 } 714 715 exit_f: 716 return err; 717 } 718