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/errno.h> 17 #include <linux/types.h> 18 #include <linux/kernel.h> 19 #include <linux/sched.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 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, 0)) < 0) 179 goto out; 180 181 /* source address lookup done in ip6_dst_lookup */ 182 183 if (ipv6_addr_any(&np->saddr)) 184 ipv6_addr_copy(&np->saddr, &fl.fl6_src); 185 186 if (ipv6_addr_any(&np->rcv_saddr)) { 187 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src); 188 inet->rcv_saddr = LOOPBACK4_IPV6; 189 } 190 191 ip6_dst_store(sk, dst, 192 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 193 &np->daddr : NULL); 194 195 sk->sk_state = TCP_ESTABLISHED; 196 out: 197 fl6_sock_release(flowlabel); 198 return err; 199 } 200 201 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 202 u16 port, u32 info, u8 *payload) 203 { 204 struct ipv6_pinfo *np = inet6_sk(sk); 205 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw; 206 struct sock_exterr_skb *serr; 207 208 if (!np->recverr) 209 return; 210 211 skb = skb_clone(skb, GFP_ATOMIC); 212 if (!skb) 213 return; 214 215 serr = SKB_EXT_ERR(skb); 216 serr->ee.ee_errno = err; 217 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 218 serr->ee.ee_type = icmph->icmp6_type; 219 serr->ee.ee_code = icmph->icmp6_code; 220 serr->ee.ee_pad = 0; 221 serr->ee.ee_info = info; 222 serr->ee.ee_data = 0; 223 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw; 224 serr->port = port; 225 226 skb->h.raw = payload; 227 __skb_pull(skb, payload - skb->data); 228 229 if (sock_queue_err_skb(sk, skb)) 230 kfree_skb(skb); 231 } 232 233 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 234 { 235 struct ipv6_pinfo *np = inet6_sk(sk); 236 struct sock_exterr_skb *serr; 237 struct ipv6hdr *iph; 238 struct sk_buff *skb; 239 240 if (!np->recverr) 241 return; 242 243 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 244 if (!skb) 245 return; 246 247 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr)); 248 skb->nh.ipv6h = iph; 249 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 250 251 serr = SKB_EXT_ERR(skb); 252 serr->ee.ee_errno = err; 253 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 254 serr->ee.ee_type = 0; 255 serr->ee.ee_code = 0; 256 serr->ee.ee_pad = 0; 257 serr->ee.ee_info = info; 258 serr->ee.ee_data = 0; 259 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; 260 serr->port = fl->fl_ip_dport; 261 262 skb->h.raw = skb->tail; 263 __skb_pull(skb, skb->tail - skb->data); 264 265 if (sock_queue_err_skb(sk, skb)) 266 kfree_skb(skb); 267 } 268 269 /* 270 * Handle MSG_ERRQUEUE 271 */ 272 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 273 { 274 struct ipv6_pinfo *np = inet6_sk(sk); 275 struct sock_exterr_skb *serr; 276 struct sk_buff *skb, *skb2; 277 struct sockaddr_in6 *sin; 278 struct { 279 struct sock_extended_err ee; 280 struct sockaddr_in6 offender; 281 } errhdr; 282 int err; 283 int copied; 284 285 err = -EAGAIN; 286 skb = skb_dequeue(&sk->sk_error_queue); 287 if (skb == NULL) 288 goto out; 289 290 copied = skb->len; 291 if (copied > len) { 292 msg->msg_flags |= MSG_TRUNC; 293 copied = len; 294 } 295 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 296 if (err) 297 goto out_free_skb; 298 299 sock_recv_timestamp(msg, sk, skb); 300 301 serr = SKB_EXT_ERR(skb); 302 303 sin = (struct sockaddr_in6 *)msg->msg_name; 304 if (sin) { 305 sin->sin6_family = AF_INET6; 306 sin->sin6_flowinfo = 0; 307 sin->sin6_port = serr->port; 308 sin->sin6_scope_id = 0; 309 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 310 ipv6_addr_copy(&sin->sin6_addr, 311 (struct in6_addr *)(skb->nh.raw + serr->addr_offset)); 312 if (np->sndflow) 313 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK; 314 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 315 sin->sin6_scope_id = IP6CB(skb)->iif; 316 } else { 317 ipv6_addr_set(&sin->sin6_addr, 0, 0, 318 htonl(0xffff), 319 *(u32*)(skb->nh.raw + serr->addr_offset)); 320 } 321 } 322 323 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 324 sin = &errhdr.offender; 325 sin->sin6_family = AF_UNSPEC; 326 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 327 sin->sin6_family = AF_INET6; 328 sin->sin6_flowinfo = 0; 329 sin->sin6_scope_id = 0; 330 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 331 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr); 332 if (np->rxopt.all) 333 datagram_recv_ctl(sk, msg, skb); 334 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 335 sin->sin6_scope_id = IP6CB(skb)->iif; 336 } else { 337 struct inet_sock *inet = inet_sk(sk); 338 339 ipv6_addr_set(&sin->sin6_addr, 0, 0, 340 htonl(0xffff), 341 skb->nh.iph->saddr); 342 if (inet->cmsg_flags) 343 ip_cmsg_recv(msg, skb); 344 } 345 } 346 347 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 348 349 /* Now we could try to dump offended packet options */ 350 351 msg->msg_flags |= MSG_ERRQUEUE; 352 err = copied; 353 354 /* Reset and regenerate socket error */ 355 spin_lock_bh(&sk->sk_error_queue.lock); 356 sk->sk_err = 0; 357 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 358 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 359 spin_unlock_bh(&sk->sk_error_queue.lock); 360 sk->sk_error_report(sk); 361 } else { 362 spin_unlock_bh(&sk->sk_error_queue.lock); 363 } 364 365 out_free_skb: 366 kfree_skb(skb); 367 out: 368 return err; 369 } 370 371 372 373 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 374 { 375 struct ipv6_pinfo *np = inet6_sk(sk); 376 struct inet6_skb_parm *opt = IP6CB(skb); 377 378 if (np->rxopt.bits.rxinfo) { 379 struct in6_pktinfo src_info; 380 381 src_info.ipi6_ifindex = opt->iif; 382 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 383 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 384 } 385 386 if (np->rxopt.bits.rxhlim) { 387 int hlim = skb->nh.ipv6h->hop_limit; 388 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 389 } 390 391 if (np->rxopt.bits.rxtclass) { 392 int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff; 393 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 394 } 395 396 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) { 397 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK; 398 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 399 } 400 401 /* HbH is allowed only once */ 402 if (np->rxopt.bits.hopopts && opt->hop) { 403 u8 *ptr = skb->nh.raw + opt->hop; 404 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 405 } 406 407 if (opt->lastopt && 408 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 409 /* 410 * Silly enough, but we need to reparse in order to 411 * report extension headers (except for HbH) 412 * in order. 413 * 414 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 415 * (and WILL NOT be) defined because 416 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 417 */ 418 unsigned int off = sizeof(struct ipv6hdr); 419 u8 nexthdr = skb->nh.ipv6h->nexthdr; 420 421 while (off <= opt->lastopt) { 422 unsigned len; 423 u8 *ptr = skb->nh.raw + off; 424 425 switch(nexthdr) { 426 case IPPROTO_DSTOPTS: 427 nexthdr = ptr[0]; 428 len = (ptr[1] + 1) << 3; 429 if (np->rxopt.bits.dstopts) 430 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 431 break; 432 case IPPROTO_ROUTING: 433 nexthdr = ptr[0]; 434 len = (ptr[1] + 1) << 3; 435 if (np->rxopt.bits.srcrt) 436 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 437 break; 438 case IPPROTO_AH: 439 nexthdr = ptr[0]; 440 len = (ptr[1] + 2) << 2; 441 break; 442 default: 443 nexthdr = ptr[0]; 444 len = (ptr[1] + 1) << 3; 445 break; 446 } 447 448 off += len; 449 } 450 } 451 452 /* socket options in old style */ 453 if (np->rxopt.bits.rxoinfo) { 454 struct in6_pktinfo src_info; 455 456 src_info.ipi6_ifindex = opt->iif; 457 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 458 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 459 } 460 if (np->rxopt.bits.rxohlim) { 461 int hlim = skb->nh.ipv6h->hop_limit; 462 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 463 } 464 if (np->rxopt.bits.ohopopts && opt->hop) { 465 u8 *ptr = skb->nh.raw + opt->hop; 466 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 467 } 468 if (np->rxopt.bits.odstopts && opt->dst0) { 469 u8 *ptr = skb->nh.raw + opt->dst0; 470 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 471 } 472 if (np->rxopt.bits.osrcrt && opt->srcrt) { 473 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt); 474 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 475 } 476 if (np->rxopt.bits.odstopts && opt->dst1) { 477 u8 *ptr = skb->nh.raw + opt->dst1; 478 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 479 } 480 return 0; 481 } 482 483 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, 484 struct ipv6_txoptions *opt, 485 int *hlimit, int *tclass) 486 { 487 struct in6_pktinfo *src_info; 488 struct cmsghdr *cmsg; 489 struct ipv6_rt_hdr *rthdr; 490 struct ipv6_opt_hdr *hdr; 491 int len; 492 int err = 0; 493 494 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 495 int addr_type; 496 struct net_device *dev = NULL; 497 498 if (!CMSG_OK(msg, cmsg)) { 499 err = -EINVAL; 500 goto exit_f; 501 } 502 503 if (cmsg->cmsg_level != SOL_IPV6) 504 continue; 505 506 switch (cmsg->cmsg_type) { 507 case IPV6_PKTINFO: 508 case IPV6_2292PKTINFO: 509 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 510 err = -EINVAL; 511 goto exit_f; 512 } 513 514 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 515 516 if (src_info->ipi6_ifindex) { 517 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 518 return -EINVAL; 519 fl->oif = src_info->ipi6_ifindex; 520 } 521 522 addr_type = ipv6_addr_type(&src_info->ipi6_addr); 523 524 if (addr_type == IPV6_ADDR_ANY) 525 break; 526 527 if (addr_type & IPV6_ADDR_LINKLOCAL) { 528 if (!src_info->ipi6_ifindex) 529 return -EINVAL; 530 else { 531 dev = dev_get_by_index(src_info->ipi6_ifindex); 532 if (!dev) 533 return -ENODEV; 534 } 535 } 536 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { 537 if (dev) 538 dev_put(dev); 539 err = -EINVAL; 540 goto exit_f; 541 } 542 if (dev) 543 dev_put(dev); 544 545 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 546 break; 547 548 case IPV6_FLOWINFO: 549 if (cmsg->cmsg_len < CMSG_LEN(4)) { 550 err = -EINVAL; 551 goto exit_f; 552 } 553 554 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 555 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 556 err = -EINVAL; 557 goto exit_f; 558 } 559 } 560 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg); 561 break; 562 563 case IPV6_2292HOPOPTS: 564 case IPV6_HOPOPTS: 565 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 566 err = -EINVAL; 567 goto exit_f; 568 } 569 570 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 571 len = ((hdr->hdrlen + 1) << 3); 572 if (cmsg->cmsg_len < CMSG_LEN(len)) { 573 err = -EINVAL; 574 goto exit_f; 575 } 576 if (!capable(CAP_NET_RAW)) { 577 err = -EPERM; 578 goto exit_f; 579 } 580 opt->opt_nflen += len; 581 opt->hopopt = hdr; 582 break; 583 584 case IPV6_2292DSTOPTS: 585 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 586 err = -EINVAL; 587 goto exit_f; 588 } 589 590 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 591 len = ((hdr->hdrlen + 1) << 3); 592 if (cmsg->cmsg_len < CMSG_LEN(len)) { 593 err = -EINVAL; 594 goto exit_f; 595 } 596 if (!capable(CAP_NET_RAW)) { 597 err = -EPERM; 598 goto exit_f; 599 } 600 if (opt->dst1opt) { 601 err = -EINVAL; 602 goto exit_f; 603 } 604 opt->opt_flen += len; 605 opt->dst1opt = hdr; 606 break; 607 608 case IPV6_DSTOPTS: 609 case IPV6_RTHDRDSTOPTS: 610 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 611 err = -EINVAL; 612 goto exit_f; 613 } 614 615 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 616 len = ((hdr->hdrlen + 1) << 3); 617 if (cmsg->cmsg_len < CMSG_LEN(len)) { 618 err = -EINVAL; 619 goto exit_f; 620 } 621 if (!capable(CAP_NET_RAW)) { 622 err = -EPERM; 623 goto exit_f; 624 } 625 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 626 opt->opt_flen += len; 627 opt->dst1opt = hdr; 628 } else { 629 opt->opt_nflen += len; 630 opt->dst0opt = hdr; 631 } 632 break; 633 634 case IPV6_2292RTHDR: 635 case IPV6_RTHDR: 636 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 637 err = -EINVAL; 638 goto exit_f; 639 } 640 641 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 642 643 /* 644 * TYPE 0 645 */ 646 if (rthdr->type) { 647 err = -EINVAL; 648 goto exit_f; 649 } 650 651 len = ((rthdr->hdrlen + 1) << 3); 652 653 if (cmsg->cmsg_len < CMSG_LEN(len)) { 654 err = -EINVAL; 655 goto exit_f; 656 } 657 658 /* segments left must also match */ 659 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 660 err = -EINVAL; 661 goto exit_f; 662 } 663 664 opt->opt_nflen += len; 665 opt->srcrt = rthdr; 666 667 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 668 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 669 670 opt->opt_nflen += dsthdrlen; 671 opt->dst0opt = opt->dst1opt; 672 opt->dst1opt = NULL; 673 opt->opt_flen -= dsthdrlen; 674 } 675 676 break; 677 678 case IPV6_2292HOPLIMIT: 679 case IPV6_HOPLIMIT: 680 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 681 err = -EINVAL; 682 goto exit_f; 683 } 684 685 *hlimit = *(int *)CMSG_DATA(cmsg); 686 break; 687 688 case IPV6_TCLASS: 689 { 690 int tc; 691 692 err = -EINVAL; 693 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 694 goto exit_f; 695 } 696 697 tc = *(int *)CMSG_DATA(cmsg); 698 if (tc < 0 || tc > 0xff) 699 goto exit_f; 700 701 err = 0; 702 *tclass = tc; 703 704 break; 705 } 706 default: 707 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 708 cmsg->cmsg_type); 709 err = -EINVAL; 710 break; 711 }; 712 } 713 714 exit_f: 715 return err; 716 } 717