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 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 datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 472 { 473 struct ipv6_pinfo *np = inet6_sk(sk); 474 struct inet6_skb_parm *opt = IP6CB(skb); 475 unsigned char *nh = skb_network_header(skb); 476 477 if (np->rxopt.bits.rxinfo) { 478 struct in6_pktinfo src_info; 479 480 src_info.ipi6_ifindex = opt->iif; 481 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 482 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 483 } 484 485 if (np->rxopt.bits.rxhlim) { 486 int hlim = ipv6_hdr(skb)->hop_limit; 487 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 488 } 489 490 if (np->rxopt.bits.rxtclass) { 491 int tclass = ipv6_tclass(ipv6_hdr(skb)); 492 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 493 } 494 495 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { 496 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; 497 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 498 } 499 500 /* HbH is allowed only once */ 501 if (np->rxopt.bits.hopopts && opt->hop) { 502 u8 *ptr = nh + opt->hop; 503 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 504 } 505 506 if (opt->lastopt && 507 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 508 /* 509 * Silly enough, but we need to reparse in order to 510 * report extension headers (except for HbH) 511 * in order. 512 * 513 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 514 * (and WILL NOT be) defined because 515 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 516 */ 517 unsigned int off = sizeof(struct ipv6hdr); 518 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 519 520 while (off <= opt->lastopt) { 521 unsigned int len; 522 u8 *ptr = nh + off; 523 524 switch (nexthdr) { 525 case IPPROTO_DSTOPTS: 526 nexthdr = ptr[0]; 527 len = (ptr[1] + 1) << 3; 528 if (np->rxopt.bits.dstopts) 529 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 530 break; 531 case IPPROTO_ROUTING: 532 nexthdr = ptr[0]; 533 len = (ptr[1] + 1) << 3; 534 if (np->rxopt.bits.srcrt) 535 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 536 break; 537 case IPPROTO_AH: 538 nexthdr = ptr[0]; 539 len = (ptr[1] + 2) << 2; 540 break; 541 default: 542 nexthdr = ptr[0]; 543 len = (ptr[1] + 1) << 3; 544 break; 545 } 546 547 off += len; 548 } 549 } 550 551 /* socket options in old style */ 552 if (np->rxopt.bits.rxoinfo) { 553 struct in6_pktinfo src_info; 554 555 src_info.ipi6_ifindex = opt->iif; 556 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 557 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 558 } 559 if (np->rxopt.bits.rxohlim) { 560 int hlim = ipv6_hdr(skb)->hop_limit; 561 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 562 } 563 if (np->rxopt.bits.ohopopts && opt->hop) { 564 u8 *ptr = nh + opt->hop; 565 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 566 } 567 if (np->rxopt.bits.odstopts && opt->dst0) { 568 u8 *ptr = nh + opt->dst0; 569 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 570 } 571 if (np->rxopt.bits.osrcrt && opt->srcrt) { 572 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 573 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 574 } 575 if (np->rxopt.bits.odstopts && opt->dst1) { 576 u8 *ptr = nh + opt->dst1; 577 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 578 } 579 if (np->rxopt.bits.rxorigdstaddr) { 580 struct sockaddr_in6 sin6; 581 __be16 *ports = (__be16 *) skb_transport_header(skb); 582 583 if (skb_transport_offset(skb) + 4 <= skb->len) { 584 /* All current transport protocols have the port numbers in the 585 * first four bytes of the transport header and this function is 586 * written with this assumption in mind. 587 */ 588 589 sin6.sin6_family = AF_INET6; 590 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 591 sin6.sin6_port = ports[1]; 592 sin6.sin6_flowinfo = 0; 593 sin6.sin6_scope_id = 0; 594 595 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 596 } 597 } 598 return 0; 599 } 600 601 int datagram_send_ctl(struct net *net, struct sock *sk, 602 struct msghdr *msg, struct flowi6 *fl6, 603 struct ipv6_txoptions *opt, 604 int *hlimit, int *tclass, int *dontfrag) 605 { 606 struct in6_pktinfo *src_info; 607 struct cmsghdr *cmsg; 608 struct ipv6_rt_hdr *rthdr; 609 struct ipv6_opt_hdr *hdr; 610 int len; 611 int err = 0; 612 613 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 614 int addr_type; 615 616 if (!CMSG_OK(msg, cmsg)) { 617 err = -EINVAL; 618 goto exit_f; 619 } 620 621 if (cmsg->cmsg_level != SOL_IPV6) 622 continue; 623 624 switch (cmsg->cmsg_type) { 625 case IPV6_PKTINFO: 626 case IPV6_2292PKTINFO: 627 { 628 struct net_device *dev = NULL; 629 630 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 631 err = -EINVAL; 632 goto exit_f; 633 } 634 635 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 636 637 if (src_info->ipi6_ifindex) { 638 if (fl6->flowi6_oif && 639 src_info->ipi6_ifindex != fl6->flowi6_oif) 640 return -EINVAL; 641 fl6->flowi6_oif = src_info->ipi6_ifindex; 642 } 643 644 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 645 646 rcu_read_lock(); 647 if (fl6->flowi6_oif) { 648 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 649 if (!dev) { 650 rcu_read_unlock(); 651 return -ENODEV; 652 } 653 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 654 rcu_read_unlock(); 655 return -EINVAL; 656 } 657 658 if (addr_type != IPV6_ADDR_ANY) { 659 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 660 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 661 !ipv6_chk_addr(net, &src_info->ipi6_addr, 662 strict ? dev : NULL, 0)) 663 err = -EINVAL; 664 else 665 fl6->saddr = src_info->ipi6_addr; 666 } 667 668 rcu_read_unlock(); 669 670 if (err) 671 goto exit_f; 672 673 break; 674 } 675 676 case IPV6_FLOWINFO: 677 if (cmsg->cmsg_len < CMSG_LEN(4)) { 678 err = -EINVAL; 679 goto exit_f; 680 } 681 682 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 683 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 684 err = -EINVAL; 685 goto exit_f; 686 } 687 } 688 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 689 break; 690 691 case IPV6_2292HOPOPTS: 692 case IPV6_HOPOPTS: 693 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 694 err = -EINVAL; 695 goto exit_f; 696 } 697 698 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 699 len = ((hdr->hdrlen + 1) << 3); 700 if (cmsg->cmsg_len < CMSG_LEN(len)) { 701 err = -EINVAL; 702 goto exit_f; 703 } 704 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 705 err = -EPERM; 706 goto exit_f; 707 } 708 opt->opt_nflen += len; 709 opt->hopopt = hdr; 710 break; 711 712 case IPV6_2292DSTOPTS: 713 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 714 err = -EINVAL; 715 goto exit_f; 716 } 717 718 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 719 len = ((hdr->hdrlen + 1) << 3); 720 if (cmsg->cmsg_len < CMSG_LEN(len)) { 721 err = -EINVAL; 722 goto exit_f; 723 } 724 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 725 err = -EPERM; 726 goto exit_f; 727 } 728 if (opt->dst1opt) { 729 err = -EINVAL; 730 goto exit_f; 731 } 732 opt->opt_flen += len; 733 opt->dst1opt = hdr; 734 break; 735 736 case IPV6_DSTOPTS: 737 case IPV6_RTHDRDSTOPTS: 738 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 739 err = -EINVAL; 740 goto exit_f; 741 } 742 743 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 744 len = ((hdr->hdrlen + 1) << 3); 745 if (cmsg->cmsg_len < CMSG_LEN(len)) { 746 err = -EINVAL; 747 goto exit_f; 748 } 749 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 750 err = -EPERM; 751 goto exit_f; 752 } 753 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 754 opt->opt_flen += len; 755 opt->dst1opt = hdr; 756 } else { 757 opt->opt_nflen += len; 758 opt->dst0opt = hdr; 759 } 760 break; 761 762 case IPV6_2292RTHDR: 763 case IPV6_RTHDR: 764 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 765 err = -EINVAL; 766 goto exit_f; 767 } 768 769 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 770 771 switch (rthdr->type) { 772 #if IS_ENABLED(CONFIG_IPV6_MIP6) 773 case IPV6_SRCRT_TYPE_2: 774 if (rthdr->hdrlen != 2 || 775 rthdr->segments_left != 1) { 776 err = -EINVAL; 777 goto exit_f; 778 } 779 break; 780 #endif 781 default: 782 err = -EINVAL; 783 goto exit_f; 784 } 785 786 len = ((rthdr->hdrlen + 1) << 3); 787 788 if (cmsg->cmsg_len < CMSG_LEN(len)) { 789 err = -EINVAL; 790 goto exit_f; 791 } 792 793 /* segments left must also match */ 794 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 795 err = -EINVAL; 796 goto exit_f; 797 } 798 799 opt->opt_nflen += len; 800 opt->srcrt = rthdr; 801 802 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 803 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 804 805 opt->opt_nflen += dsthdrlen; 806 opt->dst0opt = opt->dst1opt; 807 opt->dst1opt = NULL; 808 opt->opt_flen -= dsthdrlen; 809 } 810 811 break; 812 813 case IPV6_2292HOPLIMIT: 814 case IPV6_HOPLIMIT: 815 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 816 err = -EINVAL; 817 goto exit_f; 818 } 819 820 *hlimit = *(int *)CMSG_DATA(cmsg); 821 if (*hlimit < -1 || *hlimit > 0xff) { 822 err = -EINVAL; 823 goto exit_f; 824 } 825 826 break; 827 828 case IPV6_TCLASS: 829 { 830 int tc; 831 832 err = -EINVAL; 833 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 834 goto exit_f; 835 836 tc = *(int *)CMSG_DATA(cmsg); 837 if (tc < -1 || tc > 0xff) 838 goto exit_f; 839 840 err = 0; 841 *tclass = tc; 842 843 break; 844 } 845 846 case IPV6_DONTFRAG: 847 { 848 int df; 849 850 err = -EINVAL; 851 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 852 goto exit_f; 853 854 df = *(int *)CMSG_DATA(cmsg); 855 if (df < 0 || df > 1) 856 goto exit_f; 857 858 err = 0; 859 *dontfrag = df; 860 861 break; 862 } 863 default: 864 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 865 cmsg->cmsg_type); 866 err = -EINVAL; 867 goto exit_f; 868 } 869 } 870 871 exit_f: 872 return err; 873 } 874 EXPORT_SYMBOL_GPL(datagram_send_ctl); 875