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 = (struct icmp6hdr *)skb->h.raw; 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) - skb->nh.raw; 231 serr->port = port; 232 233 skb->h.raw = payload; 234 __skb_pull(skb, payload - skb->data); 235 236 if (sock_queue_err_skb(sk, skb)) 237 kfree_skb(skb); 238 } 239 240 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info) 241 { 242 struct ipv6_pinfo *np = inet6_sk(sk); 243 struct sock_exterr_skb *serr; 244 struct ipv6hdr *iph; 245 struct sk_buff *skb; 246 247 if (!np->recverr) 248 return; 249 250 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 251 if (!skb) 252 return; 253 254 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr)); 255 skb->nh.ipv6h = iph; 256 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst); 257 258 serr = SKB_EXT_ERR(skb); 259 serr->ee.ee_errno = err; 260 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 261 serr->ee.ee_type = 0; 262 serr->ee.ee_code = 0; 263 serr->ee.ee_pad = 0; 264 serr->ee.ee_info = info; 265 serr->ee.ee_data = 0; 266 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw; 267 serr->port = fl->fl_ip_dport; 268 269 skb->h.raw = skb->tail; 270 __skb_pull(skb, skb->tail - skb->data); 271 272 if (sock_queue_err_skb(sk, skb)) 273 kfree_skb(skb); 274 } 275 276 /* 277 * Handle MSG_ERRQUEUE 278 */ 279 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 280 { 281 struct ipv6_pinfo *np = inet6_sk(sk); 282 struct sock_exterr_skb *serr; 283 struct sk_buff *skb, *skb2; 284 struct sockaddr_in6 *sin; 285 struct { 286 struct sock_extended_err ee; 287 struct sockaddr_in6 offender; 288 } errhdr; 289 int err; 290 int copied; 291 292 err = -EAGAIN; 293 skb = skb_dequeue(&sk->sk_error_queue); 294 if (skb == NULL) 295 goto out; 296 297 copied = skb->len; 298 if (copied > len) { 299 msg->msg_flags |= MSG_TRUNC; 300 copied = len; 301 } 302 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 303 if (err) 304 goto out_free_skb; 305 306 sock_recv_timestamp(msg, sk, skb); 307 308 serr = SKB_EXT_ERR(skb); 309 310 sin = (struct sockaddr_in6 *)msg->msg_name; 311 if (sin) { 312 sin->sin6_family = AF_INET6; 313 sin->sin6_flowinfo = 0; 314 sin->sin6_port = serr->port; 315 sin->sin6_scope_id = 0; 316 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 317 ipv6_addr_copy(&sin->sin6_addr, 318 (struct in6_addr *)(skb->nh.raw + serr->addr_offset)); 319 if (np->sndflow) 320 sin->sin6_flowinfo = *(__be32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK; 321 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 322 sin->sin6_scope_id = IP6CB(skb)->iif; 323 } else { 324 ipv6_addr_set(&sin->sin6_addr, 0, 0, 325 htonl(0xffff), 326 *(__be32*)(skb->nh.raw + serr->addr_offset)); 327 } 328 } 329 330 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 331 sin = &errhdr.offender; 332 sin->sin6_family = AF_UNSPEC; 333 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 334 sin->sin6_family = AF_INET6; 335 sin->sin6_flowinfo = 0; 336 sin->sin6_scope_id = 0; 337 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) { 338 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr); 339 if (np->rxopt.all) 340 datagram_recv_ctl(sk, msg, skb); 341 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 342 sin->sin6_scope_id = IP6CB(skb)->iif; 343 } else { 344 struct inet_sock *inet = inet_sk(sk); 345 346 ipv6_addr_set(&sin->sin6_addr, 0, 0, 347 htonl(0xffff), 348 skb->nh.iph->saddr); 349 if (inet->cmsg_flags) 350 ip_cmsg_recv(msg, skb); 351 } 352 } 353 354 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 355 356 /* Now we could try to dump offended packet options */ 357 358 msg->msg_flags |= MSG_ERRQUEUE; 359 err = copied; 360 361 /* Reset and regenerate socket error */ 362 spin_lock_bh(&sk->sk_error_queue.lock); 363 sk->sk_err = 0; 364 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 365 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 366 spin_unlock_bh(&sk->sk_error_queue.lock); 367 sk->sk_error_report(sk); 368 } else { 369 spin_unlock_bh(&sk->sk_error_queue.lock); 370 } 371 372 out_free_skb: 373 kfree_skb(skb); 374 out: 375 return err; 376 } 377 378 379 380 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 381 { 382 struct ipv6_pinfo *np = inet6_sk(sk); 383 struct inet6_skb_parm *opt = IP6CB(skb); 384 385 if (np->rxopt.bits.rxinfo) { 386 struct in6_pktinfo src_info; 387 388 src_info.ipi6_ifindex = opt->iif; 389 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 390 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 391 } 392 393 if (np->rxopt.bits.rxhlim) { 394 int hlim = skb->nh.ipv6h->hop_limit; 395 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 396 } 397 398 if (np->rxopt.bits.rxtclass) { 399 int tclass = (ntohl(*(__be32 *)skb->nh.ipv6h) >> 20) & 0xff; 400 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 401 } 402 403 if (np->rxopt.bits.rxflow && (*(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) { 404 __be32 flowinfo = *(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK; 405 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 406 } 407 408 /* HbH is allowed only once */ 409 if (np->rxopt.bits.hopopts && opt->hop) { 410 u8 *ptr = skb->nh.raw + opt->hop; 411 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 412 } 413 414 if (opt->lastopt && 415 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 416 /* 417 * Silly enough, but we need to reparse in order to 418 * report extension headers (except for HbH) 419 * in order. 420 * 421 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 422 * (and WILL NOT be) defined because 423 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 424 */ 425 unsigned int off = sizeof(struct ipv6hdr); 426 u8 nexthdr = skb->nh.ipv6h->nexthdr; 427 428 while (off <= opt->lastopt) { 429 unsigned len; 430 u8 *ptr = skb->nh.raw + off; 431 432 switch(nexthdr) { 433 case IPPROTO_DSTOPTS: 434 nexthdr = ptr[0]; 435 len = (ptr[1] + 1) << 3; 436 if (np->rxopt.bits.dstopts) 437 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 438 break; 439 case IPPROTO_ROUTING: 440 nexthdr = ptr[0]; 441 len = (ptr[1] + 1) << 3; 442 if (np->rxopt.bits.srcrt) 443 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 444 break; 445 case IPPROTO_AH: 446 nexthdr = ptr[0]; 447 len = (ptr[1] + 2) << 2; 448 break; 449 default: 450 nexthdr = ptr[0]; 451 len = (ptr[1] + 1) << 3; 452 break; 453 } 454 455 off += len; 456 } 457 } 458 459 /* socket options in old style */ 460 if (np->rxopt.bits.rxoinfo) { 461 struct in6_pktinfo src_info; 462 463 src_info.ipi6_ifindex = opt->iif; 464 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr); 465 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 466 } 467 if (np->rxopt.bits.rxohlim) { 468 int hlim = skb->nh.ipv6h->hop_limit; 469 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 470 } 471 if (np->rxopt.bits.ohopopts && opt->hop) { 472 u8 *ptr = skb->nh.raw + opt->hop; 473 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 474 } 475 if (np->rxopt.bits.odstopts && opt->dst0) { 476 u8 *ptr = skb->nh.raw + opt->dst0; 477 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 478 } 479 if (np->rxopt.bits.osrcrt && opt->srcrt) { 480 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt); 481 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 482 } 483 if (np->rxopt.bits.odstopts && opt->dst1) { 484 u8 *ptr = skb->nh.raw + opt->dst1; 485 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 486 } 487 return 0; 488 } 489 490 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl, 491 struct ipv6_txoptions *opt, 492 int *hlimit, int *tclass) 493 { 494 struct in6_pktinfo *src_info; 495 struct cmsghdr *cmsg; 496 struct ipv6_rt_hdr *rthdr; 497 struct ipv6_opt_hdr *hdr; 498 int len; 499 int err = 0; 500 501 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 502 int addr_type; 503 struct net_device *dev = NULL; 504 505 if (!CMSG_OK(msg, cmsg)) { 506 err = -EINVAL; 507 goto exit_f; 508 } 509 510 if (cmsg->cmsg_level != SOL_IPV6) 511 continue; 512 513 switch (cmsg->cmsg_type) { 514 case IPV6_PKTINFO: 515 case IPV6_2292PKTINFO: 516 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 517 err = -EINVAL; 518 goto exit_f; 519 } 520 521 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 522 523 if (src_info->ipi6_ifindex) { 524 if (fl->oif && src_info->ipi6_ifindex != fl->oif) 525 return -EINVAL; 526 fl->oif = src_info->ipi6_ifindex; 527 } 528 529 addr_type = ipv6_addr_type(&src_info->ipi6_addr); 530 531 if (addr_type == IPV6_ADDR_ANY) 532 break; 533 534 if (addr_type & IPV6_ADDR_LINKLOCAL) { 535 if (!src_info->ipi6_ifindex) 536 return -EINVAL; 537 else { 538 dev = dev_get_by_index(src_info->ipi6_ifindex); 539 if (!dev) 540 return -ENODEV; 541 } 542 } 543 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) { 544 if (dev) 545 dev_put(dev); 546 err = -EINVAL; 547 goto exit_f; 548 } 549 if (dev) 550 dev_put(dev); 551 552 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr); 553 break; 554 555 case IPV6_FLOWINFO: 556 if (cmsg->cmsg_len < CMSG_LEN(4)) { 557 err = -EINVAL; 558 goto exit_f; 559 } 560 561 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) { 562 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 563 err = -EINVAL; 564 goto exit_f; 565 } 566 } 567 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 568 break; 569 570 case IPV6_2292HOPOPTS: 571 case IPV6_HOPOPTS: 572 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 573 err = -EINVAL; 574 goto exit_f; 575 } 576 577 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 578 len = ((hdr->hdrlen + 1) << 3); 579 if (cmsg->cmsg_len < CMSG_LEN(len)) { 580 err = -EINVAL; 581 goto exit_f; 582 } 583 if (!capable(CAP_NET_RAW)) { 584 err = -EPERM; 585 goto exit_f; 586 } 587 opt->opt_nflen += len; 588 opt->hopopt = hdr; 589 break; 590 591 case IPV6_2292DSTOPTS: 592 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 593 err = -EINVAL; 594 goto exit_f; 595 } 596 597 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 598 len = ((hdr->hdrlen + 1) << 3); 599 if (cmsg->cmsg_len < CMSG_LEN(len)) { 600 err = -EINVAL; 601 goto exit_f; 602 } 603 if (!capable(CAP_NET_RAW)) { 604 err = -EPERM; 605 goto exit_f; 606 } 607 if (opt->dst1opt) { 608 err = -EINVAL; 609 goto exit_f; 610 } 611 opt->opt_flen += len; 612 opt->dst1opt = hdr; 613 break; 614 615 case IPV6_DSTOPTS: 616 case IPV6_RTHDRDSTOPTS: 617 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 618 err = -EINVAL; 619 goto exit_f; 620 } 621 622 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 623 len = ((hdr->hdrlen + 1) << 3); 624 if (cmsg->cmsg_len < CMSG_LEN(len)) { 625 err = -EINVAL; 626 goto exit_f; 627 } 628 if (!capable(CAP_NET_RAW)) { 629 err = -EPERM; 630 goto exit_f; 631 } 632 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 633 opt->opt_flen += len; 634 opt->dst1opt = hdr; 635 } else { 636 opt->opt_nflen += len; 637 opt->dst0opt = hdr; 638 } 639 break; 640 641 case IPV6_2292RTHDR: 642 case IPV6_RTHDR: 643 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 644 err = -EINVAL; 645 goto exit_f; 646 } 647 648 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 649 650 switch (rthdr->type) { 651 case IPV6_SRCRT_TYPE_0: 652 #ifdef CONFIG_IPV6_MIP6 653 case IPV6_SRCRT_TYPE_2: 654 #endif 655 break; 656 default: 657 err = -EINVAL; 658 goto exit_f; 659 } 660 661 len = ((rthdr->hdrlen + 1) << 3); 662 663 if (cmsg->cmsg_len < CMSG_LEN(len)) { 664 err = -EINVAL; 665 goto exit_f; 666 } 667 668 /* segments left must also match */ 669 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 670 err = -EINVAL; 671 goto exit_f; 672 } 673 674 opt->opt_nflen += len; 675 opt->srcrt = rthdr; 676 677 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 678 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 679 680 opt->opt_nflen += dsthdrlen; 681 opt->dst0opt = opt->dst1opt; 682 opt->dst1opt = NULL; 683 opt->opt_flen -= dsthdrlen; 684 } 685 686 break; 687 688 case IPV6_2292HOPLIMIT: 689 case IPV6_HOPLIMIT: 690 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 691 err = -EINVAL; 692 goto exit_f; 693 } 694 695 *hlimit = *(int *)CMSG_DATA(cmsg); 696 break; 697 698 case IPV6_TCLASS: 699 { 700 int tc; 701 702 err = -EINVAL; 703 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 704 goto exit_f; 705 } 706 707 tc = *(int *)CMSG_DATA(cmsg); 708 if (tc < -1 || tc > 0xff) 709 goto exit_f; 710 711 err = 0; 712 *tclass = tc; 713 714 break; 715 } 716 default: 717 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 718 cmsg->cmsg_type); 719 err = -EINVAL; 720 break; 721 }; 722 } 723 724 exit_f: 725 return err; 726 } 727