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 #include <linux/slab.h> 25 26 #include <net/ipv6.h> 27 #include <net/ndisc.h> 28 #include <net/addrconf.h> 29 #include <net/transp_v6.h> 30 #include <net/ip6_route.h> 31 #include <net/tcp_states.h> 32 33 #include <linux/errqueue.h> 34 #include <asm/uaccess.h> 35 36 static inline int ipv6_mapped_addr_any(const struct in6_addr *a) 37 { 38 return (ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0)); 39 } 40 41 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 42 { 43 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 44 struct inet_sock *inet = inet_sk(sk); 45 struct ipv6_pinfo *np = inet6_sk(sk); 46 struct in6_addr *daddr, *final_p, final; 47 struct dst_entry *dst; 48 struct flowi6 fl6; 49 struct ip6_flowlabel *flowlabel = NULL; 50 struct ipv6_txoptions *opt; 51 int addr_type; 52 int err; 53 54 if (usin->sin6_family == AF_INET) { 55 if (__ipv6_only_sock(sk)) 56 return -EAFNOSUPPORT; 57 err = ip4_datagram_connect(sk, uaddr, addr_len); 58 goto ipv4_connected; 59 } 60 61 if (addr_len < SIN6_LEN_RFC2133) 62 return -EINVAL; 63 64 if (usin->sin6_family != AF_INET6) 65 return -EAFNOSUPPORT; 66 67 memset(&fl6, 0, sizeof(fl6)); 68 if (np->sndflow) { 69 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 70 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 71 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 72 if (flowlabel == NULL) 73 return -EINVAL; 74 usin->sin6_addr = flowlabel->dst; 75 } 76 } 77 78 addr_type = ipv6_addr_type(&usin->sin6_addr); 79 80 if (addr_type == IPV6_ADDR_ANY) { 81 /* 82 * connect to self 83 */ 84 usin->sin6_addr.s6_addr[15] = 0x01; 85 } 86 87 daddr = &usin->sin6_addr; 88 89 if (addr_type == IPV6_ADDR_MAPPED) { 90 struct sockaddr_in sin; 91 92 if (__ipv6_only_sock(sk)) { 93 err = -ENETUNREACH; 94 goto out; 95 } 96 sin.sin_family = AF_INET; 97 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 98 sin.sin_port = usin->sin6_port; 99 100 err = ip4_datagram_connect(sk, 101 (struct sockaddr*) &sin, 102 sizeof(sin)); 103 104 ipv4_connected: 105 if (err) 106 goto out; 107 108 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); 109 110 if (ipv6_addr_any(&np->saddr) || 111 ipv6_mapped_addr_any(&np->saddr)) 112 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 113 114 if (ipv6_addr_any(&np->rcv_saddr) || 115 ipv6_mapped_addr_any(&np->rcv_saddr)) { 116 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 117 &np->rcv_saddr); 118 if (sk->sk_prot->rehash) 119 sk->sk_prot->rehash(sk); 120 } 121 122 goto out; 123 } 124 125 if (addr_type&IPV6_ADDR_LINKLOCAL) { 126 if (addr_len >= sizeof(struct sockaddr_in6) && 127 usin->sin6_scope_id) { 128 if (sk->sk_bound_dev_if && 129 sk->sk_bound_dev_if != usin->sin6_scope_id) { 130 err = -EINVAL; 131 goto out; 132 } 133 sk->sk_bound_dev_if = usin->sin6_scope_id; 134 } 135 136 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 137 sk->sk_bound_dev_if = np->mcast_oif; 138 139 /* Connect to link-local address requires an interface */ 140 if (!sk->sk_bound_dev_if) { 141 err = -EINVAL; 142 goto out; 143 } 144 } 145 146 np->daddr = *daddr; 147 np->flow_label = fl6.flowlabel; 148 149 inet->inet_dport = usin->sin6_port; 150 151 /* 152 * Check for a route to destination an obtain the 153 * destination cache for it. 154 */ 155 156 fl6.flowi6_proto = sk->sk_protocol; 157 fl6.daddr = np->daddr; 158 fl6.saddr = np->saddr; 159 fl6.flowi6_oif = sk->sk_bound_dev_if; 160 fl6.flowi6_mark = sk->sk_mark; 161 fl6.fl6_dport = inet->inet_dport; 162 fl6.fl6_sport = inet->inet_sport; 163 164 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) 165 fl6.flowi6_oif = np->mcast_oif; 166 167 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 168 169 opt = flowlabel ? flowlabel->opt : np->opt; 170 final_p = fl6_update_dst(&fl6, opt, &final); 171 172 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 173 err = 0; 174 if (IS_ERR(dst)) { 175 err = PTR_ERR(dst); 176 goto out; 177 } 178 179 /* source address lookup done in ip6_dst_lookup */ 180 181 if (ipv6_addr_any(&np->saddr)) 182 np->saddr = fl6.saddr; 183 184 if (ipv6_addr_any(&np->rcv_saddr)) { 185 np->rcv_saddr = fl6.saddr; 186 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 187 if (sk->sk_prot->rehash) 188 sk->sk_prot->rehash(sk); 189 } 190 191 ip6_dst_store(sk, dst, 192 ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 193 &np->daddr : NULL, 194 #ifdef CONFIG_IPV6_SUBTREES 195 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 196 &np->saddr : 197 #endif 198 NULL); 199 200 sk->sk_state = TCP_ESTABLISHED; 201 out: 202 fl6_sock_release(flowlabel); 203 return err; 204 } 205 206 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 207 __be16 port, u32 info, u8 *payload) 208 { 209 struct ipv6_pinfo *np = inet6_sk(sk); 210 struct icmp6hdr *icmph = icmp6_hdr(skb); 211 struct sock_exterr_skb *serr; 212 213 if (!np->recverr) 214 return; 215 216 skb = skb_clone(skb, GFP_ATOMIC); 217 if (!skb) 218 return; 219 220 skb->protocol = htons(ETH_P_IPV6); 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 flowi6 *fl6, 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->protocol = htons(ETH_P_IPV6); 256 257 skb_put(skb, sizeof(struct ipv6hdr)); 258 skb_reset_network_header(skb); 259 iph = ipv6_hdr(skb); 260 iph->daddr = fl6->daddr; 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 = fl6->fl6_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 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 281 { 282 struct ipv6_pinfo *np = inet6_sk(sk); 283 struct ipv6hdr *iph; 284 struct sk_buff *skb; 285 struct ip6_mtuinfo *mtu_info; 286 287 if (!np->rxopt.bits.rxpmtu) 288 return; 289 290 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 291 if (!skb) 292 return; 293 294 skb_put(skb, sizeof(struct ipv6hdr)); 295 skb_reset_network_header(skb); 296 iph = ipv6_hdr(skb); 297 iph->daddr = fl6->daddr; 298 299 mtu_info = IP6CBMTU(skb); 300 301 mtu_info->ip6m_mtu = mtu; 302 mtu_info->ip6m_addr.sin6_family = AF_INET6; 303 mtu_info->ip6m_addr.sin6_port = 0; 304 mtu_info->ip6m_addr.sin6_flowinfo = 0; 305 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 306 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 307 308 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 309 skb_reset_transport_header(skb); 310 311 skb = xchg(&np->rxpmtu, skb); 312 kfree_skb(skb); 313 } 314 315 /* 316 * Handle MSG_ERRQUEUE 317 */ 318 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 319 { 320 struct ipv6_pinfo *np = inet6_sk(sk); 321 struct sock_exterr_skb *serr; 322 struct sk_buff *skb, *skb2; 323 struct sockaddr_in6 *sin; 324 struct { 325 struct sock_extended_err ee; 326 struct sockaddr_in6 offender; 327 } errhdr; 328 int err; 329 int copied; 330 331 err = -EAGAIN; 332 skb = skb_dequeue(&sk->sk_error_queue); 333 if (skb == NULL) 334 goto out; 335 336 copied = skb->len; 337 if (copied > len) { 338 msg->msg_flags |= MSG_TRUNC; 339 copied = len; 340 } 341 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 342 if (err) 343 goto out_free_skb; 344 345 sock_recv_timestamp(msg, sk, skb); 346 347 serr = SKB_EXT_ERR(skb); 348 349 sin = (struct sockaddr_in6 *)msg->msg_name; 350 if (sin) { 351 const unsigned char *nh = skb_network_header(skb); 352 sin->sin6_family = AF_INET6; 353 sin->sin6_flowinfo = 0; 354 sin->sin6_port = serr->port; 355 sin->sin6_scope_id = 0; 356 if (skb->protocol == htons(ETH_P_IPV6)) { 357 sin->sin6_addr = 358 *(struct in6_addr *)(nh + serr->addr_offset); 359 if (np->sndflow) 360 sin->sin6_flowinfo = 361 (*(__be32 *)(nh + serr->addr_offset - 24) & 362 IPV6_FLOWINFO_MASK); 363 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 364 sin->sin6_scope_id = IP6CB(skb)->iif; 365 } else { 366 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 367 &sin->sin6_addr); 368 } 369 } 370 371 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 372 sin = &errhdr.offender; 373 sin->sin6_family = AF_UNSPEC; 374 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 375 sin->sin6_family = AF_INET6; 376 sin->sin6_flowinfo = 0; 377 sin->sin6_scope_id = 0; 378 if (skb->protocol == htons(ETH_P_IPV6)) { 379 sin->sin6_addr = ipv6_hdr(skb)->saddr; 380 if (np->rxopt.all) 381 datagram_recv_ctl(sk, msg, skb); 382 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 383 sin->sin6_scope_id = IP6CB(skb)->iif; 384 } else { 385 struct inet_sock *inet = inet_sk(sk); 386 387 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 388 &sin->sin6_addr); 389 if (inet->cmsg_flags) 390 ip_cmsg_recv(msg, skb); 391 } 392 } 393 394 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 395 396 /* Now we could try to dump offended packet options */ 397 398 msg->msg_flags |= MSG_ERRQUEUE; 399 err = copied; 400 401 /* Reset and regenerate socket error */ 402 spin_lock_bh(&sk->sk_error_queue.lock); 403 sk->sk_err = 0; 404 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 405 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 406 spin_unlock_bh(&sk->sk_error_queue.lock); 407 sk->sk_error_report(sk); 408 } else { 409 spin_unlock_bh(&sk->sk_error_queue.lock); 410 } 411 412 out_free_skb: 413 kfree_skb(skb); 414 out: 415 return err; 416 } 417 418 /* 419 * Handle IPV6_RECVPATHMTU 420 */ 421 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len) 422 { 423 struct ipv6_pinfo *np = inet6_sk(sk); 424 struct sk_buff *skb; 425 struct sockaddr_in6 *sin; 426 struct ip6_mtuinfo mtu_info; 427 int err; 428 int copied; 429 430 err = -EAGAIN; 431 skb = xchg(&np->rxpmtu, NULL); 432 if (skb == NULL) 433 goto out; 434 435 copied = skb->len; 436 if (copied > len) { 437 msg->msg_flags |= MSG_TRUNC; 438 copied = len; 439 } 440 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 441 if (err) 442 goto out_free_skb; 443 444 sock_recv_timestamp(msg, sk, skb); 445 446 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 447 448 sin = (struct sockaddr_in6 *)msg->msg_name; 449 if (sin) { 450 sin->sin6_family = AF_INET6; 451 sin->sin6_flowinfo = 0; 452 sin->sin6_port = 0; 453 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 454 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 455 } 456 457 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 458 459 err = copied; 460 461 out_free_skb: 462 kfree_skb(skb); 463 out: 464 return err; 465 } 466 467 468 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 469 { 470 struct ipv6_pinfo *np = inet6_sk(sk); 471 struct inet6_skb_parm *opt = IP6CB(skb); 472 unsigned char *nh = skb_network_header(skb); 473 474 if (np->rxopt.bits.rxinfo) { 475 struct in6_pktinfo src_info; 476 477 src_info.ipi6_ifindex = opt->iif; 478 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 479 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 480 } 481 482 if (np->rxopt.bits.rxhlim) { 483 int hlim = ipv6_hdr(skb)->hop_limit; 484 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 485 } 486 487 if (np->rxopt.bits.rxtclass) { 488 int tclass = ipv6_tclass(ipv6_hdr(skb)); 489 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 490 } 491 492 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 493 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 494 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 495 } 496 497 /* HbH is allowed only once */ 498 if (np->rxopt.bits.hopopts && opt->hop) { 499 u8 *ptr = nh + opt->hop; 500 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 501 } 502 503 if (opt->lastopt && 504 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 505 /* 506 * Silly enough, but we need to reparse in order to 507 * report extension headers (except for HbH) 508 * in order. 509 * 510 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 511 * (and WILL NOT be) defined because 512 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 513 */ 514 unsigned int off = sizeof(struct ipv6hdr); 515 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 516 517 while (off <= opt->lastopt) { 518 unsigned len; 519 u8 *ptr = nh + off; 520 521 switch(nexthdr) { 522 case IPPROTO_DSTOPTS: 523 nexthdr = ptr[0]; 524 len = (ptr[1] + 1) << 3; 525 if (np->rxopt.bits.dstopts) 526 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 527 break; 528 case IPPROTO_ROUTING: 529 nexthdr = ptr[0]; 530 len = (ptr[1] + 1) << 3; 531 if (np->rxopt.bits.srcrt) 532 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 533 break; 534 case IPPROTO_AH: 535 nexthdr = ptr[0]; 536 len = (ptr[1] + 2) << 2; 537 break; 538 default: 539 nexthdr = ptr[0]; 540 len = (ptr[1] + 1) << 3; 541 break; 542 } 543 544 off += len; 545 } 546 } 547 548 /* socket options in old style */ 549 if (np->rxopt.bits.rxoinfo) { 550 struct in6_pktinfo src_info; 551 552 src_info.ipi6_ifindex = opt->iif; 553 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 554 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 555 } 556 if (np->rxopt.bits.rxohlim) { 557 int hlim = ipv6_hdr(skb)->hop_limit; 558 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 559 } 560 if (np->rxopt.bits.ohopopts && opt->hop) { 561 u8 *ptr = nh + opt->hop; 562 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 563 } 564 if (np->rxopt.bits.odstopts && opt->dst0) { 565 u8 *ptr = nh + opt->dst0; 566 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 567 } 568 if (np->rxopt.bits.osrcrt && opt->srcrt) { 569 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 570 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 571 } 572 if (np->rxopt.bits.odstopts && opt->dst1) { 573 u8 *ptr = nh + opt->dst1; 574 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 575 } 576 if (np->rxopt.bits.rxorigdstaddr) { 577 struct sockaddr_in6 sin6; 578 __be16 *ports = (__be16 *) skb_transport_header(skb); 579 580 if (skb_transport_offset(skb) + 4 <= skb->len) { 581 /* All current transport protocols have the port numbers in the 582 * first four bytes of the transport header and this function is 583 * written with this assumption in mind. 584 */ 585 586 sin6.sin6_family = AF_INET6; 587 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 588 sin6.sin6_port = ports[1]; 589 sin6.sin6_flowinfo = 0; 590 sin6.sin6_scope_id = 0; 591 592 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 593 } 594 } 595 return 0; 596 } 597 598 int datagram_send_ctl(struct net *net, struct sock *sk, 599 struct msghdr *msg, struct flowi6 *fl6, 600 struct ipv6_txoptions *opt, 601 int *hlimit, int *tclass, int *dontfrag) 602 { 603 struct in6_pktinfo *src_info; 604 struct cmsghdr *cmsg; 605 struct ipv6_rt_hdr *rthdr; 606 struct ipv6_opt_hdr *hdr; 607 int len; 608 int err = 0; 609 610 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 611 int addr_type; 612 613 if (!CMSG_OK(msg, cmsg)) { 614 err = -EINVAL; 615 goto exit_f; 616 } 617 618 if (cmsg->cmsg_level != SOL_IPV6) 619 continue; 620 621 switch (cmsg->cmsg_type) { 622 case IPV6_PKTINFO: 623 case IPV6_2292PKTINFO: 624 { 625 struct net_device *dev = NULL; 626 627 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 628 err = -EINVAL; 629 goto exit_f; 630 } 631 632 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 633 634 if (src_info->ipi6_ifindex) { 635 if (fl6->flowi6_oif && 636 src_info->ipi6_ifindex != fl6->flowi6_oif) 637 return -EINVAL; 638 fl6->flowi6_oif = src_info->ipi6_ifindex; 639 } 640 641 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 642 643 rcu_read_lock(); 644 if (fl6->flowi6_oif) { 645 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 646 if (!dev) { 647 rcu_read_unlock(); 648 return -ENODEV; 649 } 650 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 651 rcu_read_unlock(); 652 return -EINVAL; 653 } 654 655 if (addr_type != IPV6_ADDR_ANY) { 656 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 657 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 658 !ipv6_chk_addr(net, &src_info->ipi6_addr, 659 strict ? dev : NULL, 0)) 660 err = -EINVAL; 661 else 662 fl6->saddr = src_info->ipi6_addr; 663 } 664 665 rcu_read_unlock(); 666 667 if (err) 668 goto exit_f; 669 670 break; 671 } 672 673 case IPV6_FLOWINFO: 674 if (cmsg->cmsg_len < CMSG_LEN(4)) { 675 err = -EINVAL; 676 goto exit_f; 677 } 678 679 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 680 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 681 err = -EINVAL; 682 goto exit_f; 683 } 684 } 685 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 686 break; 687 688 case IPV6_2292HOPOPTS: 689 case IPV6_HOPOPTS: 690 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 691 err = -EINVAL; 692 goto exit_f; 693 } 694 695 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 696 len = ((hdr->hdrlen + 1) << 3); 697 if (cmsg->cmsg_len < CMSG_LEN(len)) { 698 err = -EINVAL; 699 goto exit_f; 700 } 701 if (!capable(CAP_NET_RAW)) { 702 err = -EPERM; 703 goto exit_f; 704 } 705 opt->opt_nflen += len; 706 opt->hopopt = hdr; 707 break; 708 709 case IPV6_2292DSTOPTS: 710 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 711 err = -EINVAL; 712 goto exit_f; 713 } 714 715 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 716 len = ((hdr->hdrlen + 1) << 3); 717 if (cmsg->cmsg_len < CMSG_LEN(len)) { 718 err = -EINVAL; 719 goto exit_f; 720 } 721 if (!capable(CAP_NET_RAW)) { 722 err = -EPERM; 723 goto exit_f; 724 } 725 if (opt->dst1opt) { 726 err = -EINVAL; 727 goto exit_f; 728 } 729 opt->opt_flen += len; 730 opt->dst1opt = hdr; 731 break; 732 733 case IPV6_DSTOPTS: 734 case IPV6_RTHDRDSTOPTS: 735 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 736 err = -EINVAL; 737 goto exit_f; 738 } 739 740 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 741 len = ((hdr->hdrlen + 1) << 3); 742 if (cmsg->cmsg_len < CMSG_LEN(len)) { 743 err = -EINVAL; 744 goto exit_f; 745 } 746 if (!capable(CAP_NET_RAW)) { 747 err = -EPERM; 748 goto exit_f; 749 } 750 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 751 opt->opt_flen += len; 752 opt->dst1opt = hdr; 753 } else { 754 opt->opt_nflen += len; 755 opt->dst0opt = hdr; 756 } 757 break; 758 759 case IPV6_2292RTHDR: 760 case IPV6_RTHDR: 761 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 762 err = -EINVAL; 763 goto exit_f; 764 } 765 766 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 767 768 switch (rthdr->type) { 769 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 770 case IPV6_SRCRT_TYPE_2: 771 if (rthdr->hdrlen != 2 || 772 rthdr->segments_left != 1) { 773 err = -EINVAL; 774 goto exit_f; 775 } 776 break; 777 #endif 778 default: 779 err = -EINVAL; 780 goto exit_f; 781 } 782 783 len = ((rthdr->hdrlen + 1) << 3); 784 785 if (cmsg->cmsg_len < CMSG_LEN(len)) { 786 err = -EINVAL; 787 goto exit_f; 788 } 789 790 /* segments left must also match */ 791 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 792 err = -EINVAL; 793 goto exit_f; 794 } 795 796 opt->opt_nflen += len; 797 opt->srcrt = rthdr; 798 799 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 800 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 801 802 opt->opt_nflen += dsthdrlen; 803 opt->dst0opt = opt->dst1opt; 804 opt->dst1opt = NULL; 805 opt->opt_flen -= dsthdrlen; 806 } 807 808 break; 809 810 case IPV6_2292HOPLIMIT: 811 case IPV6_HOPLIMIT: 812 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 813 err = -EINVAL; 814 goto exit_f; 815 } 816 817 *hlimit = *(int *)CMSG_DATA(cmsg); 818 if (*hlimit < -1 || *hlimit > 0xff) { 819 err = -EINVAL; 820 goto exit_f; 821 } 822 823 break; 824 825 case IPV6_TCLASS: 826 { 827 int tc; 828 829 err = -EINVAL; 830 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 831 goto exit_f; 832 } 833 834 tc = *(int *)CMSG_DATA(cmsg); 835 if (tc < -1 || tc > 0xff) 836 goto exit_f; 837 838 err = 0; 839 *tclass = tc; 840 841 break; 842 } 843 844 case IPV6_DONTFRAG: 845 { 846 int df; 847 848 err = -EINVAL; 849 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 850 goto exit_f; 851 } 852 853 df = *(int *)CMSG_DATA(cmsg); 854 if (df < 0 || df > 1) 855 goto exit_f; 856 857 err = 0; 858 *dontfrag = df; 859 860 break; 861 } 862 default: 863 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 864 cmsg->cmsg_type); 865 err = -EINVAL; 866 goto exit_f; 867 } 868 } 869 870 exit_f: 871 return err; 872 } 873