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 #include <linux/export.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 static bool ipv6_mapped_addr_any(const struct in6_addr *a) 38 { 39 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); 40 } 41 42 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 43 { 44 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 45 struct inet_sock *inet = inet_sk(sk); 46 struct ipv6_pinfo *np = inet6_sk(sk); 47 struct in6_addr *daddr, *final_p, final; 48 struct dst_entry *dst; 49 struct flowi6 fl6; 50 struct ip6_flowlabel *flowlabel = NULL; 51 struct ipv6_txoptions *opt; 52 int addr_type; 53 int err; 54 55 if (usin->sin6_family == AF_INET) { 56 if (__ipv6_only_sock(sk)) 57 return -EAFNOSUPPORT; 58 err = ip4_datagram_connect(sk, uaddr, addr_len); 59 goto ipv4_connected; 60 } 61 62 if (addr_len < SIN6_LEN_RFC2133) 63 return -EINVAL; 64 65 if (usin->sin6_family != AF_INET6) 66 return -EAFNOSUPPORT; 67 68 memset(&fl6, 0, sizeof(fl6)); 69 if (np->sndflow) { 70 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 71 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 72 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 73 if (flowlabel == NULL) 74 return -EINVAL; 75 usin->sin6_addr = flowlabel->dst; 76 } 77 } 78 79 addr_type = ipv6_addr_type(&usin->sin6_addr); 80 81 if (addr_type == IPV6_ADDR_ANY) { 82 /* 83 * connect to self 84 */ 85 usin->sin6_addr.s6_addr[15] = 0x01; 86 } 87 88 daddr = &usin->sin6_addr; 89 90 if (addr_type == IPV6_ADDR_MAPPED) { 91 struct sockaddr_in sin; 92 93 if (__ipv6_only_sock(sk)) { 94 err = -ENETUNREACH; 95 goto out; 96 } 97 sin.sin_family = AF_INET; 98 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 99 sin.sin_port = usin->sin6_port; 100 101 err = ip4_datagram_connect(sk, 102 (struct sockaddr *) &sin, 103 sizeof(sin)); 104 105 ipv4_connected: 106 if (err) 107 goto out; 108 109 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); 110 111 if (ipv6_addr_any(&np->saddr) || 112 ipv6_mapped_addr_any(&np->saddr)) 113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 114 115 if (ipv6_addr_any(&np->rcv_saddr) || 116 ipv6_mapped_addr_any(&np->rcv_saddr)) { 117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 118 &np->rcv_saddr); 119 if (sk->sk_prot->rehash) 120 sk->sk_prot->rehash(sk); 121 } 122 123 goto out; 124 } 125 126 if (addr_type&IPV6_ADDR_LINKLOCAL) { 127 if (addr_len >= sizeof(struct sockaddr_in6) && 128 usin->sin6_scope_id) { 129 if (sk->sk_bound_dev_if && 130 sk->sk_bound_dev_if != usin->sin6_scope_id) { 131 err = -EINVAL; 132 goto out; 133 } 134 sk->sk_bound_dev_if = usin->sin6_scope_id; 135 } 136 137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 138 sk->sk_bound_dev_if = np->mcast_oif; 139 140 /* Connect to link-local address requires an interface */ 141 if (!sk->sk_bound_dev_if) { 142 err = -EINVAL; 143 goto out; 144 } 145 } 146 147 np->daddr = *daddr; 148 np->flow_label = fl6.flowlabel; 149 150 inet->inet_dport = usin->sin6_port; 151 152 /* 153 * Check for a route to destination an obtain the 154 * destination cache for it. 155 */ 156 157 fl6.flowi6_proto = sk->sk_protocol; 158 fl6.daddr = np->daddr; 159 fl6.saddr = np->saddr; 160 fl6.flowi6_oif = sk->sk_bound_dev_if; 161 fl6.flowi6_mark = sk->sk_mark; 162 fl6.fl6_dport = inet->inet_dport; 163 fl6.fl6_sport = inet->inet_sport; 164 165 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) 166 fl6.flowi6_oif = np->mcast_oif; 167 168 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 169 170 opt = flowlabel ? flowlabel->opt : np->opt; 171 final_p = fl6_update_dst(&fl6, opt, &final); 172 173 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 174 err = 0; 175 if (IS_ERR(dst)) { 176 err = PTR_ERR(dst); 177 goto out; 178 } 179 180 /* source address lookup done in ip6_dst_lookup */ 181 182 if (ipv6_addr_any(&np->saddr)) 183 np->saddr = fl6.saddr; 184 185 if (ipv6_addr_any(&np->rcv_saddr)) { 186 np->rcv_saddr = fl6.saddr; 187 inet->inet_rcv_saddr = LOOPBACK4_IPV6; 188 if (sk->sk_prot->rehash) 189 sk->sk_prot->rehash(sk); 190 } 191 192 ip6_dst_store(sk, dst, 193 ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 194 &np->daddr : NULL, 195 #ifdef CONFIG_IPV6_SUBTREES 196 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 197 &np->saddr : 198 #endif 199 NULL); 200 201 sk->sk_state = TCP_ESTABLISHED; 202 out: 203 fl6_sock_release(flowlabel); 204 return err; 205 } 206 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 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 skb->protocol = htons(ETH_P_IPV6); 223 224 serr = SKB_EXT_ERR(skb); 225 serr->ee.ee_errno = err; 226 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 227 serr->ee.ee_type = icmph->icmp6_type; 228 serr->ee.ee_code = icmph->icmp6_code; 229 serr->ee.ee_pad = 0; 230 serr->ee.ee_info = info; 231 serr->ee.ee_data = 0; 232 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 233 skb_network_header(skb); 234 serr->port = port; 235 236 __skb_pull(skb, payload - skb->data); 237 skb_reset_transport_header(skb); 238 239 if (sock_queue_err_skb(sk, skb)) 240 kfree_skb(skb); 241 } 242 243 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 244 { 245 struct ipv6_pinfo *np = inet6_sk(sk); 246 struct sock_exterr_skb *serr; 247 struct ipv6hdr *iph; 248 struct sk_buff *skb; 249 250 if (!np->recverr) 251 return; 252 253 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 254 if (!skb) 255 return; 256 257 skb->protocol = htons(ETH_P_IPV6); 258 259 skb_put(skb, sizeof(struct ipv6hdr)); 260 skb_reset_network_header(skb); 261 iph = ipv6_hdr(skb); 262 iph->daddr = fl6->daddr; 263 264 serr = SKB_EXT_ERR(skb); 265 serr->ee.ee_errno = err; 266 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 267 serr->ee.ee_type = 0; 268 serr->ee.ee_code = 0; 269 serr->ee.ee_pad = 0; 270 serr->ee.ee_info = info; 271 serr->ee.ee_data = 0; 272 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 273 serr->port = fl6->fl6_dport; 274 275 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 276 skb_reset_transport_header(skb); 277 278 if (sock_queue_err_skb(sk, skb)) 279 kfree_skb(skb); 280 } 281 282 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 283 { 284 struct ipv6_pinfo *np = inet6_sk(sk); 285 struct ipv6hdr *iph; 286 struct sk_buff *skb; 287 struct ip6_mtuinfo *mtu_info; 288 289 if (!np->rxopt.bits.rxpmtu) 290 return; 291 292 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 293 if (!skb) 294 return; 295 296 skb_put(skb, sizeof(struct ipv6hdr)); 297 skb_reset_network_header(skb); 298 iph = ipv6_hdr(skb); 299 iph->daddr = fl6->daddr; 300 301 mtu_info = IP6CBMTU(skb); 302 303 mtu_info->ip6m_mtu = mtu; 304 mtu_info->ip6m_addr.sin6_family = AF_INET6; 305 mtu_info->ip6m_addr.sin6_port = 0; 306 mtu_info->ip6m_addr.sin6_flowinfo = 0; 307 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 308 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 309 310 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 311 skb_reset_transport_header(skb); 312 313 skb = xchg(&np->rxpmtu, skb); 314 kfree_skb(skb); 315 } 316 317 /* 318 * Handle MSG_ERRQUEUE 319 */ 320 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) 321 { 322 struct ipv6_pinfo *np = inet6_sk(sk); 323 struct sock_exterr_skb *serr; 324 struct sk_buff *skb, *skb2; 325 struct sockaddr_in6 *sin; 326 struct { 327 struct sock_extended_err ee; 328 struct sockaddr_in6 offender; 329 } errhdr; 330 int err; 331 int copied; 332 333 err = -EAGAIN; 334 skb = skb_dequeue(&sk->sk_error_queue); 335 if (skb == NULL) 336 goto out; 337 338 copied = skb->len; 339 if (copied > len) { 340 msg->msg_flags |= MSG_TRUNC; 341 copied = len; 342 } 343 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 344 if (err) 345 goto out_free_skb; 346 347 sock_recv_timestamp(msg, sk, skb); 348 349 serr = SKB_EXT_ERR(skb); 350 351 sin = (struct sockaddr_in6 *)msg->msg_name; 352 if (sin) { 353 const unsigned char *nh = skb_network_header(skb); 354 sin->sin6_family = AF_INET6; 355 sin->sin6_flowinfo = 0; 356 sin->sin6_port = serr->port; 357 sin->sin6_scope_id = 0; 358 if (skb->protocol == htons(ETH_P_IPV6)) { 359 sin->sin6_addr = 360 *(struct in6_addr *)(nh + serr->addr_offset); 361 if (np->sndflow) 362 sin->sin6_flowinfo = 363 (*(__be32 *)(nh + serr->addr_offset - 24) & 364 IPV6_FLOWINFO_MASK); 365 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 366 sin->sin6_scope_id = IP6CB(skb)->iif; 367 } else { 368 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 369 &sin->sin6_addr); 370 } 371 } 372 373 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 374 sin = &errhdr.offender; 375 sin->sin6_family = AF_UNSPEC; 376 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 377 sin->sin6_family = AF_INET6; 378 sin->sin6_flowinfo = 0; 379 sin->sin6_scope_id = 0; 380 if (skb->protocol == htons(ETH_P_IPV6)) { 381 sin->sin6_addr = ipv6_hdr(skb)->saddr; 382 if (np->rxopt.all) 383 ip6_datagram_recv_ctl(sk, msg, skb); 384 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 385 sin->sin6_scope_id = IP6CB(skb)->iif; 386 } else { 387 struct inet_sock *inet = inet_sk(sk); 388 389 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 390 &sin->sin6_addr); 391 if (inet->cmsg_flags) 392 ip_cmsg_recv(msg, skb); 393 } 394 } 395 396 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 397 398 /* Now we could try to dump offended packet options */ 399 400 msg->msg_flags |= MSG_ERRQUEUE; 401 err = copied; 402 403 /* Reset and regenerate socket error */ 404 spin_lock_bh(&sk->sk_error_queue.lock); 405 sk->sk_err = 0; 406 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 407 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 408 spin_unlock_bh(&sk->sk_error_queue.lock); 409 sk->sk_error_report(sk); 410 } else { 411 spin_unlock_bh(&sk->sk_error_queue.lock); 412 } 413 414 out_free_skb: 415 kfree_skb(skb); 416 out: 417 return err; 418 } 419 EXPORT_SYMBOL_GPL(ipv6_recv_error); 420 421 /* 422 * Handle IPV6_RECVPATHMTU 423 */ 424 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len) 425 { 426 struct ipv6_pinfo *np = inet6_sk(sk); 427 struct sk_buff *skb; 428 struct sockaddr_in6 *sin; 429 struct ip6_mtuinfo mtu_info; 430 int err; 431 int copied; 432 433 err = -EAGAIN; 434 skb = xchg(&np->rxpmtu, NULL); 435 if (skb == NULL) 436 goto out; 437 438 copied = skb->len; 439 if (copied > len) { 440 msg->msg_flags |= MSG_TRUNC; 441 copied = len; 442 } 443 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 444 if (err) 445 goto out_free_skb; 446 447 sock_recv_timestamp(msg, sk, skb); 448 449 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 450 451 sin = (struct sockaddr_in6 *)msg->msg_name; 452 if (sin) { 453 sin->sin6_family = AF_INET6; 454 sin->sin6_flowinfo = 0; 455 sin->sin6_port = 0; 456 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 457 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 458 } 459 460 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 461 462 err = copied; 463 464 out_free_skb: 465 kfree_skb(skb); 466 out: 467 return err; 468 } 469 470 471 int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 472 struct sk_buff *skb) 473 { 474 struct ipv6_pinfo *np = inet6_sk(sk); 475 struct inet6_skb_parm *opt = IP6CB(skb); 476 unsigned char *nh = skb_network_header(skb); 477 478 if (np->rxopt.bits.rxinfo) { 479 struct in6_pktinfo src_info; 480 481 src_info.ipi6_ifindex = opt->iif; 482 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 483 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 484 } 485 486 if (np->rxopt.bits.rxhlim) { 487 int hlim = ipv6_hdr(skb)->hop_limit; 488 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 489 } 490 491 if (np->rxopt.bits.rxtclass) { 492 int tclass = ipv6_tclass(ipv6_hdr(skb)); 493 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 494 } 495 496 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 497 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 498 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 499 } 500 501 /* HbH is allowed only once */ 502 if (np->rxopt.bits.hopopts && opt->hop) { 503 u8 *ptr = nh + opt->hop; 504 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 505 } 506 507 if (opt->lastopt && 508 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 509 /* 510 * Silly enough, but we need to reparse in order to 511 * report extension headers (except for HbH) 512 * in order. 513 * 514 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 515 * (and WILL NOT be) defined because 516 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 517 */ 518 unsigned int off = sizeof(struct ipv6hdr); 519 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 520 521 while (off <= opt->lastopt) { 522 unsigned int len; 523 u8 *ptr = nh + off; 524 525 switch (nexthdr) { 526 case IPPROTO_DSTOPTS: 527 nexthdr = ptr[0]; 528 len = (ptr[1] + 1) << 3; 529 if (np->rxopt.bits.dstopts) 530 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 531 break; 532 case IPPROTO_ROUTING: 533 nexthdr = ptr[0]; 534 len = (ptr[1] + 1) << 3; 535 if (np->rxopt.bits.srcrt) 536 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 537 break; 538 case IPPROTO_AH: 539 nexthdr = ptr[0]; 540 len = (ptr[1] + 2) << 2; 541 break; 542 default: 543 nexthdr = ptr[0]; 544 len = (ptr[1] + 1) << 3; 545 break; 546 } 547 548 off += len; 549 } 550 } 551 552 /* socket options in old style */ 553 if (np->rxopt.bits.rxoinfo) { 554 struct in6_pktinfo src_info; 555 556 src_info.ipi6_ifindex = opt->iif; 557 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 558 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 559 } 560 if (np->rxopt.bits.rxohlim) { 561 int hlim = ipv6_hdr(skb)->hop_limit; 562 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 563 } 564 if (np->rxopt.bits.ohopopts && opt->hop) { 565 u8 *ptr = nh + opt->hop; 566 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 567 } 568 if (np->rxopt.bits.odstopts && opt->dst0) { 569 u8 *ptr = nh + opt->dst0; 570 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 571 } 572 if (np->rxopt.bits.osrcrt && opt->srcrt) { 573 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 574 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 575 } 576 if (np->rxopt.bits.odstopts && opt->dst1) { 577 u8 *ptr = nh + opt->dst1; 578 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 579 } 580 if (np->rxopt.bits.rxorigdstaddr) { 581 struct sockaddr_in6 sin6; 582 __be16 *ports = (__be16 *) skb_transport_header(skb); 583 584 if (skb_transport_offset(skb) + 4 <= skb->len) { 585 /* All current transport protocols have the port numbers in the 586 * first four bytes of the transport header and this function is 587 * written with this assumption in mind. 588 */ 589 590 sin6.sin6_family = AF_INET6; 591 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 592 sin6.sin6_port = ports[1]; 593 sin6.sin6_flowinfo = 0; 594 sin6.sin6_scope_id = 0; 595 596 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 597 } 598 } 599 return 0; 600 } 601 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 602 603 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 604 struct msghdr *msg, struct flowi6 *fl6, 605 struct ipv6_txoptions *opt, 606 int *hlimit, int *tclass, int *dontfrag) 607 { 608 struct in6_pktinfo *src_info; 609 struct cmsghdr *cmsg; 610 struct ipv6_rt_hdr *rthdr; 611 struct ipv6_opt_hdr *hdr; 612 int len; 613 int err = 0; 614 615 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 616 int addr_type; 617 618 if (!CMSG_OK(msg, cmsg)) { 619 err = -EINVAL; 620 goto exit_f; 621 } 622 623 if (cmsg->cmsg_level != SOL_IPV6) 624 continue; 625 626 switch (cmsg->cmsg_type) { 627 case IPV6_PKTINFO: 628 case IPV6_2292PKTINFO: 629 { 630 struct net_device *dev = NULL; 631 632 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 633 err = -EINVAL; 634 goto exit_f; 635 } 636 637 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 638 639 if (src_info->ipi6_ifindex) { 640 if (fl6->flowi6_oif && 641 src_info->ipi6_ifindex != fl6->flowi6_oif) 642 return -EINVAL; 643 fl6->flowi6_oif = src_info->ipi6_ifindex; 644 } 645 646 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 647 648 rcu_read_lock(); 649 if (fl6->flowi6_oif) { 650 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 651 if (!dev) { 652 rcu_read_unlock(); 653 return -ENODEV; 654 } 655 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 656 rcu_read_unlock(); 657 return -EINVAL; 658 } 659 660 if (addr_type != IPV6_ADDR_ANY) { 661 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 662 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 663 !ipv6_chk_addr(net, &src_info->ipi6_addr, 664 strict ? dev : NULL, 0)) 665 err = -EINVAL; 666 else 667 fl6->saddr = src_info->ipi6_addr; 668 } 669 670 rcu_read_unlock(); 671 672 if (err) 673 goto exit_f; 674 675 break; 676 } 677 678 case IPV6_FLOWINFO: 679 if (cmsg->cmsg_len < CMSG_LEN(4)) { 680 err = -EINVAL; 681 goto exit_f; 682 } 683 684 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 685 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 686 err = -EINVAL; 687 goto exit_f; 688 } 689 } 690 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 691 break; 692 693 case IPV6_2292HOPOPTS: 694 case IPV6_HOPOPTS: 695 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 696 err = -EINVAL; 697 goto exit_f; 698 } 699 700 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 701 len = ((hdr->hdrlen + 1) << 3); 702 if (cmsg->cmsg_len < CMSG_LEN(len)) { 703 err = -EINVAL; 704 goto exit_f; 705 } 706 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 707 err = -EPERM; 708 goto exit_f; 709 } 710 opt->opt_nflen += len; 711 opt->hopopt = hdr; 712 break; 713 714 case IPV6_2292DSTOPTS: 715 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 716 err = -EINVAL; 717 goto exit_f; 718 } 719 720 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 721 len = ((hdr->hdrlen + 1) << 3); 722 if (cmsg->cmsg_len < CMSG_LEN(len)) { 723 err = -EINVAL; 724 goto exit_f; 725 } 726 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 727 err = -EPERM; 728 goto exit_f; 729 } 730 if (opt->dst1opt) { 731 err = -EINVAL; 732 goto exit_f; 733 } 734 opt->opt_flen += len; 735 opt->dst1opt = hdr; 736 break; 737 738 case IPV6_DSTOPTS: 739 case IPV6_RTHDRDSTOPTS: 740 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 741 err = -EINVAL; 742 goto exit_f; 743 } 744 745 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 746 len = ((hdr->hdrlen + 1) << 3); 747 if (cmsg->cmsg_len < CMSG_LEN(len)) { 748 err = -EINVAL; 749 goto exit_f; 750 } 751 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 752 err = -EPERM; 753 goto exit_f; 754 } 755 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 756 opt->opt_flen += len; 757 opt->dst1opt = hdr; 758 } else { 759 opt->opt_nflen += len; 760 opt->dst0opt = hdr; 761 } 762 break; 763 764 case IPV6_2292RTHDR: 765 case IPV6_RTHDR: 766 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 767 err = -EINVAL; 768 goto exit_f; 769 } 770 771 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 772 773 switch (rthdr->type) { 774 #if IS_ENABLED(CONFIG_IPV6_MIP6) 775 case IPV6_SRCRT_TYPE_2: 776 if (rthdr->hdrlen != 2 || 777 rthdr->segments_left != 1) { 778 err = -EINVAL; 779 goto exit_f; 780 } 781 break; 782 #endif 783 default: 784 err = -EINVAL; 785 goto exit_f; 786 } 787 788 len = ((rthdr->hdrlen + 1) << 3); 789 790 if (cmsg->cmsg_len < CMSG_LEN(len)) { 791 err = -EINVAL; 792 goto exit_f; 793 } 794 795 /* segments left must also match */ 796 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 797 err = -EINVAL; 798 goto exit_f; 799 } 800 801 opt->opt_nflen += len; 802 opt->srcrt = rthdr; 803 804 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 805 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 806 807 opt->opt_nflen += dsthdrlen; 808 opt->dst0opt = opt->dst1opt; 809 opt->dst1opt = NULL; 810 opt->opt_flen -= dsthdrlen; 811 } 812 813 break; 814 815 case IPV6_2292HOPLIMIT: 816 case IPV6_HOPLIMIT: 817 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 818 err = -EINVAL; 819 goto exit_f; 820 } 821 822 *hlimit = *(int *)CMSG_DATA(cmsg); 823 if (*hlimit < -1 || *hlimit > 0xff) { 824 err = -EINVAL; 825 goto exit_f; 826 } 827 828 break; 829 830 case IPV6_TCLASS: 831 { 832 int tc; 833 834 err = -EINVAL; 835 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 836 goto exit_f; 837 838 tc = *(int *)CMSG_DATA(cmsg); 839 if (tc < -1 || tc > 0xff) 840 goto exit_f; 841 842 err = 0; 843 *tclass = tc; 844 845 break; 846 } 847 848 case IPV6_DONTFRAG: 849 { 850 int df; 851 852 err = -EINVAL; 853 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 854 goto exit_f; 855 856 df = *(int *)CMSG_DATA(cmsg); 857 if (df < 0 || df > 1) 858 goto exit_f; 859 860 err = 0; 861 *dontfrag = df; 862 863 break; 864 } 865 default: 866 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 867 cmsg->cmsg_type); 868 err = -EINVAL; 869 goto exit_f; 870 } 871 } 872 873 exit_f: 874 return err; 875 } 876 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 877