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 #include <net/dsfield.h> 34 35 #include <linux/errqueue.h> 36 #include <asm/uaccess.h> 37 38 static bool ipv6_mapped_addr_any(const struct in6_addr *a) 39 { 40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); 41 } 42 43 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 44 { 45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 46 struct inet_sock *inet = inet_sk(sk); 47 struct ipv6_pinfo *np = inet6_sk(sk); 48 struct in6_addr *daddr, *final_p, final; 49 struct dst_entry *dst; 50 struct flowi6 fl6; 51 struct ip6_flowlabel *flowlabel = NULL; 52 struct ipv6_txoptions *opt; 53 int addr_type; 54 int err; 55 56 if (usin->sin6_family == AF_INET) { 57 if (__ipv6_only_sock(sk)) 58 return -EAFNOSUPPORT; 59 err = ip4_datagram_connect(sk, uaddr, addr_len); 60 goto ipv4_connected; 61 } 62 63 if (addr_len < SIN6_LEN_RFC2133) 64 return -EINVAL; 65 66 if (usin->sin6_family != AF_INET6) 67 return -EAFNOSUPPORT; 68 69 memset(&fl6, 0, sizeof(fl6)); 70 if (np->sndflow) { 71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 74 if (flowlabel == NULL) 75 return -EINVAL; 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, &sk->sk_v6_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(&sk->sk_v6_rcv_saddr) || 116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 118 &sk->sk_v6_rcv_saddr); 119 if (sk->sk_prot->rehash) 120 sk->sk_prot->rehash(sk); 121 } 122 123 goto out; 124 } 125 126 if (__ipv6_addr_needs_scope_id(addr_type)) { 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 sk->sk_v6_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 = sk->sk_v6_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); 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(&sk->sk_v6_rcv_saddr)) { 186 sk->sk_v6_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, &sk->sk_v6_daddr) ? 194 &sk->sk_v6_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 ip6_set_txhash(sk); 203 out: 204 fl6_sock_release(flowlabel); 205 return err; 206 } 207 EXPORT_SYMBOL_GPL(ip6_datagram_connect); 208 209 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 210 int addr_len) 211 { 212 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 213 if (sin6->sin6_family != AF_INET6) 214 return -EAFNOSUPPORT; 215 return ip6_datagram_connect(sk, uaddr, addr_len); 216 } 217 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 218 219 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 220 __be16 port, u32 info, u8 *payload) 221 { 222 struct ipv6_pinfo *np = inet6_sk(sk); 223 struct icmp6hdr *icmph = icmp6_hdr(skb); 224 struct sock_exterr_skb *serr; 225 226 if (!np->recverr) 227 return; 228 229 skb = skb_clone(skb, GFP_ATOMIC); 230 if (!skb) 231 return; 232 233 skb->protocol = htons(ETH_P_IPV6); 234 235 serr = SKB_EXT_ERR(skb); 236 serr->ee.ee_errno = err; 237 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 238 serr->ee.ee_type = icmph->icmp6_type; 239 serr->ee.ee_code = icmph->icmp6_code; 240 serr->ee.ee_pad = 0; 241 serr->ee.ee_info = info; 242 serr->ee.ee_data = 0; 243 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 244 skb_network_header(skb); 245 serr->port = port; 246 247 __skb_pull(skb, payload - skb->data); 248 skb_reset_transport_header(skb); 249 250 if (sock_queue_err_skb(sk, skb)) 251 kfree_skb(skb); 252 } 253 254 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 255 { 256 struct ipv6_pinfo *np = inet6_sk(sk); 257 struct sock_exterr_skb *serr; 258 struct ipv6hdr *iph; 259 struct sk_buff *skb; 260 261 if (!np->recverr) 262 return; 263 264 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 265 if (!skb) 266 return; 267 268 skb->protocol = htons(ETH_P_IPV6); 269 270 skb_put(skb, sizeof(struct ipv6hdr)); 271 skb_reset_network_header(skb); 272 iph = ipv6_hdr(skb); 273 iph->daddr = fl6->daddr; 274 275 serr = SKB_EXT_ERR(skb); 276 serr->ee.ee_errno = err; 277 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 278 serr->ee.ee_type = 0; 279 serr->ee.ee_code = 0; 280 serr->ee.ee_pad = 0; 281 serr->ee.ee_info = info; 282 serr->ee.ee_data = 0; 283 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 284 serr->port = fl6->fl6_dport; 285 286 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 287 skb_reset_transport_header(skb); 288 289 if (sock_queue_err_skb(sk, skb)) 290 kfree_skb(skb); 291 } 292 293 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 294 { 295 struct ipv6_pinfo *np = inet6_sk(sk); 296 struct ipv6hdr *iph; 297 struct sk_buff *skb; 298 struct ip6_mtuinfo *mtu_info; 299 300 if (!np->rxopt.bits.rxpmtu) 301 return; 302 303 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 304 if (!skb) 305 return; 306 307 skb_put(skb, sizeof(struct ipv6hdr)); 308 skb_reset_network_header(skb); 309 iph = ipv6_hdr(skb); 310 iph->daddr = fl6->daddr; 311 312 mtu_info = IP6CBMTU(skb); 313 314 mtu_info->ip6m_mtu = mtu; 315 mtu_info->ip6m_addr.sin6_family = AF_INET6; 316 mtu_info->ip6m_addr.sin6_port = 0; 317 mtu_info->ip6m_addr.sin6_flowinfo = 0; 318 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 319 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 320 321 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 322 skb_reset_transport_header(skb); 323 324 skb = xchg(&np->rxpmtu, skb); 325 kfree_skb(skb); 326 } 327 328 /* 329 * Handle MSG_ERRQUEUE 330 */ 331 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 332 { 333 struct ipv6_pinfo *np = inet6_sk(sk); 334 struct sock_exterr_skb *serr; 335 struct sk_buff *skb; 336 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 337 struct { 338 struct sock_extended_err ee; 339 struct sockaddr_in6 offender; 340 } errhdr; 341 int err; 342 int copied; 343 344 err = -EAGAIN; 345 skb = sock_dequeue_err_skb(sk); 346 if (skb == NULL) 347 goto out; 348 349 copied = skb->len; 350 if (copied > len) { 351 msg->msg_flags |= MSG_TRUNC; 352 copied = len; 353 } 354 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 355 if (err) 356 goto out_free_skb; 357 358 sock_recv_timestamp(msg, sk, skb); 359 360 serr = SKB_EXT_ERR(skb); 361 362 if (sin) { 363 const unsigned char *nh = skb_network_header(skb); 364 sin->sin6_family = AF_INET6; 365 sin->sin6_flowinfo = 0; 366 sin->sin6_port = serr->port; 367 if (skb->protocol == htons(ETH_P_IPV6)) { 368 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 369 struct ipv6hdr, daddr); 370 sin->sin6_addr = ip6h->daddr; 371 if (np->sndflow) 372 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 373 sin->sin6_scope_id = 374 ipv6_iface_scope_id(&sin->sin6_addr, 375 IP6CB(skb)->iif); 376 } else { 377 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 378 &sin->sin6_addr); 379 sin->sin6_scope_id = 0; 380 } 381 *addr_len = sizeof(*sin); 382 } 383 384 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 385 sin = &errhdr.offender; 386 sin->sin6_family = AF_UNSPEC; 387 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 388 sin->sin6_family = AF_INET6; 389 sin->sin6_flowinfo = 0; 390 sin->sin6_port = 0; 391 if (np->rxopt.all) 392 ip6_datagram_recv_common_ctl(sk, msg, skb); 393 if (skb->protocol == htons(ETH_P_IPV6)) { 394 sin->sin6_addr = ipv6_hdr(skb)->saddr; 395 if (np->rxopt.all) 396 ip6_datagram_recv_specific_ctl(sk, msg, skb); 397 sin->sin6_scope_id = 398 ipv6_iface_scope_id(&sin->sin6_addr, 399 IP6CB(skb)->iif); 400 } else { 401 struct inet_sock *inet = inet_sk(sk); 402 403 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 404 &sin->sin6_addr); 405 sin->sin6_scope_id = 0; 406 if (inet->cmsg_flags) 407 ip_cmsg_recv(msg, skb); 408 } 409 } 410 411 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 412 413 /* Now we could try to dump offended packet options */ 414 415 msg->msg_flags |= MSG_ERRQUEUE; 416 err = copied; 417 418 out_free_skb: 419 kfree_skb(skb); 420 out: 421 return err; 422 } 423 EXPORT_SYMBOL_GPL(ipv6_recv_error); 424 425 /* 426 * Handle IPV6_RECVPATHMTU 427 */ 428 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 429 int *addr_len) 430 { 431 struct ipv6_pinfo *np = inet6_sk(sk); 432 struct sk_buff *skb; 433 struct ip6_mtuinfo mtu_info; 434 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 435 int err; 436 int copied; 437 438 err = -EAGAIN; 439 skb = xchg(&np->rxpmtu, NULL); 440 if (skb == NULL) 441 goto out; 442 443 copied = skb->len; 444 if (copied > len) { 445 msg->msg_flags |= MSG_TRUNC; 446 copied = len; 447 } 448 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 449 if (err) 450 goto out_free_skb; 451 452 sock_recv_timestamp(msg, sk, skb); 453 454 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 455 456 if (sin) { 457 sin->sin6_family = AF_INET6; 458 sin->sin6_flowinfo = 0; 459 sin->sin6_port = 0; 460 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 461 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 462 *addr_len = sizeof(*sin); 463 } 464 465 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 466 467 err = copied; 468 469 out_free_skb: 470 kfree_skb(skb); 471 out: 472 return err; 473 } 474 475 476 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 477 struct sk_buff *skb) 478 { 479 struct ipv6_pinfo *np = inet6_sk(sk); 480 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 481 482 if (np->rxopt.bits.rxinfo) { 483 struct in6_pktinfo src_info; 484 485 if (is_ipv6) { 486 src_info.ipi6_ifindex = IP6CB(skb)->iif; 487 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 488 } else { 489 src_info.ipi6_ifindex = 490 PKTINFO_SKB_CB(skb)->ipi_ifindex; 491 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 492 &src_info.ipi6_addr); 493 } 494 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 495 } 496 } 497 498 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 499 struct sk_buff *skb) 500 { 501 struct ipv6_pinfo *np = inet6_sk(sk); 502 struct inet6_skb_parm *opt = IP6CB(skb); 503 unsigned char *nh = skb_network_header(skb); 504 505 if (np->rxopt.bits.rxhlim) { 506 int hlim = ipv6_hdr(skb)->hop_limit; 507 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 508 } 509 510 if (np->rxopt.bits.rxtclass) { 511 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 512 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 513 } 514 515 if (np->rxopt.bits.rxflow) { 516 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 517 if (flowinfo) 518 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 519 } 520 521 /* HbH is allowed only once */ 522 if (np->rxopt.bits.hopopts && opt->hop) { 523 u8 *ptr = nh + opt->hop; 524 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 525 } 526 527 if (opt->lastopt && 528 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 529 /* 530 * Silly enough, but we need to reparse in order to 531 * report extension headers (except for HbH) 532 * in order. 533 * 534 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 535 * (and WILL NOT be) defined because 536 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 537 */ 538 unsigned int off = sizeof(struct ipv6hdr); 539 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 540 541 while (off <= opt->lastopt) { 542 unsigned int len; 543 u8 *ptr = nh + off; 544 545 switch (nexthdr) { 546 case IPPROTO_DSTOPTS: 547 nexthdr = ptr[0]; 548 len = (ptr[1] + 1) << 3; 549 if (np->rxopt.bits.dstopts) 550 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 551 break; 552 case IPPROTO_ROUTING: 553 nexthdr = ptr[0]; 554 len = (ptr[1] + 1) << 3; 555 if (np->rxopt.bits.srcrt) 556 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 557 break; 558 case IPPROTO_AH: 559 nexthdr = ptr[0]; 560 len = (ptr[1] + 2) << 2; 561 break; 562 default: 563 nexthdr = ptr[0]; 564 len = (ptr[1] + 1) << 3; 565 break; 566 } 567 568 off += len; 569 } 570 } 571 572 /* socket options in old style */ 573 if (np->rxopt.bits.rxoinfo) { 574 struct in6_pktinfo src_info; 575 576 src_info.ipi6_ifindex = opt->iif; 577 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 578 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 579 } 580 if (np->rxopt.bits.rxohlim) { 581 int hlim = ipv6_hdr(skb)->hop_limit; 582 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 583 } 584 if (np->rxopt.bits.ohopopts && opt->hop) { 585 u8 *ptr = nh + opt->hop; 586 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 587 } 588 if (np->rxopt.bits.odstopts && opt->dst0) { 589 u8 *ptr = nh + opt->dst0; 590 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 591 } 592 if (np->rxopt.bits.osrcrt && opt->srcrt) { 593 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 594 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 595 } 596 if (np->rxopt.bits.odstopts && opt->dst1) { 597 u8 *ptr = nh + opt->dst1; 598 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 599 } 600 if (np->rxopt.bits.rxorigdstaddr) { 601 struct sockaddr_in6 sin6; 602 __be16 *ports = (__be16 *) skb_transport_header(skb); 603 604 if (skb_transport_offset(skb) + 4 <= skb->len) { 605 /* All current transport protocols have the port numbers in the 606 * first four bytes of the transport header and this function is 607 * written with this assumption in mind. 608 */ 609 610 sin6.sin6_family = AF_INET6; 611 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 612 sin6.sin6_port = ports[1]; 613 sin6.sin6_flowinfo = 0; 614 sin6.sin6_scope_id = 615 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 616 opt->iif); 617 618 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 619 } 620 } 621 } 622 623 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 624 struct sk_buff *skb) 625 { 626 ip6_datagram_recv_common_ctl(sk, msg, skb); 627 ip6_datagram_recv_specific_ctl(sk, msg, skb); 628 } 629 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 630 631 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 632 struct msghdr *msg, struct flowi6 *fl6, 633 struct ipv6_txoptions *opt, 634 int *hlimit, int *tclass, int *dontfrag) 635 { 636 struct in6_pktinfo *src_info; 637 struct cmsghdr *cmsg; 638 struct ipv6_rt_hdr *rthdr; 639 struct ipv6_opt_hdr *hdr; 640 int len; 641 int err = 0; 642 643 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 644 int addr_type; 645 646 if (!CMSG_OK(msg, cmsg)) { 647 err = -EINVAL; 648 goto exit_f; 649 } 650 651 if (cmsg->cmsg_level != SOL_IPV6) 652 continue; 653 654 switch (cmsg->cmsg_type) { 655 case IPV6_PKTINFO: 656 case IPV6_2292PKTINFO: 657 { 658 struct net_device *dev = NULL; 659 660 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 661 err = -EINVAL; 662 goto exit_f; 663 } 664 665 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 666 667 if (src_info->ipi6_ifindex) { 668 if (fl6->flowi6_oif && 669 src_info->ipi6_ifindex != fl6->flowi6_oif) 670 return -EINVAL; 671 fl6->flowi6_oif = src_info->ipi6_ifindex; 672 } 673 674 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 675 676 rcu_read_lock(); 677 if (fl6->flowi6_oif) { 678 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 679 if (!dev) { 680 rcu_read_unlock(); 681 return -ENODEV; 682 } 683 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 684 rcu_read_unlock(); 685 return -EINVAL; 686 } 687 688 if (addr_type != IPV6_ADDR_ANY) { 689 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 690 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 691 !ipv6_chk_addr(net, &src_info->ipi6_addr, 692 strict ? dev : NULL, 0) && 693 !ipv6_chk_acast_addr_src(net, dev, 694 &src_info->ipi6_addr)) 695 err = -EINVAL; 696 else 697 fl6->saddr = src_info->ipi6_addr; 698 } 699 700 rcu_read_unlock(); 701 702 if (err) 703 goto exit_f; 704 705 break; 706 } 707 708 case IPV6_FLOWINFO: 709 if (cmsg->cmsg_len < CMSG_LEN(4)) { 710 err = -EINVAL; 711 goto exit_f; 712 } 713 714 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 715 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 716 err = -EINVAL; 717 goto exit_f; 718 } 719 } 720 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 721 break; 722 723 case IPV6_2292HOPOPTS: 724 case IPV6_HOPOPTS: 725 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 726 err = -EINVAL; 727 goto exit_f; 728 } 729 730 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 731 len = ((hdr->hdrlen + 1) << 3); 732 if (cmsg->cmsg_len < CMSG_LEN(len)) { 733 err = -EINVAL; 734 goto exit_f; 735 } 736 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 737 err = -EPERM; 738 goto exit_f; 739 } 740 opt->opt_nflen += len; 741 opt->hopopt = hdr; 742 break; 743 744 case IPV6_2292DSTOPTS: 745 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 746 err = -EINVAL; 747 goto exit_f; 748 } 749 750 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 751 len = ((hdr->hdrlen + 1) << 3); 752 if (cmsg->cmsg_len < CMSG_LEN(len)) { 753 err = -EINVAL; 754 goto exit_f; 755 } 756 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 757 err = -EPERM; 758 goto exit_f; 759 } 760 if (opt->dst1opt) { 761 err = -EINVAL; 762 goto exit_f; 763 } 764 opt->opt_flen += len; 765 opt->dst1opt = hdr; 766 break; 767 768 case IPV6_DSTOPTS: 769 case IPV6_RTHDRDSTOPTS: 770 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 771 err = -EINVAL; 772 goto exit_f; 773 } 774 775 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 776 len = ((hdr->hdrlen + 1) << 3); 777 if (cmsg->cmsg_len < CMSG_LEN(len)) { 778 err = -EINVAL; 779 goto exit_f; 780 } 781 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 782 err = -EPERM; 783 goto exit_f; 784 } 785 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 786 opt->opt_flen += len; 787 opt->dst1opt = hdr; 788 } else { 789 opt->opt_nflen += len; 790 opt->dst0opt = hdr; 791 } 792 break; 793 794 case IPV6_2292RTHDR: 795 case IPV6_RTHDR: 796 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 797 err = -EINVAL; 798 goto exit_f; 799 } 800 801 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 802 803 switch (rthdr->type) { 804 #if IS_ENABLED(CONFIG_IPV6_MIP6) 805 case IPV6_SRCRT_TYPE_2: 806 if (rthdr->hdrlen != 2 || 807 rthdr->segments_left != 1) { 808 err = -EINVAL; 809 goto exit_f; 810 } 811 break; 812 #endif 813 default: 814 err = -EINVAL; 815 goto exit_f; 816 } 817 818 len = ((rthdr->hdrlen + 1) << 3); 819 820 if (cmsg->cmsg_len < CMSG_LEN(len)) { 821 err = -EINVAL; 822 goto exit_f; 823 } 824 825 /* segments left must also match */ 826 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 827 err = -EINVAL; 828 goto exit_f; 829 } 830 831 opt->opt_nflen += len; 832 opt->srcrt = rthdr; 833 834 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 835 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 836 837 opt->opt_nflen += dsthdrlen; 838 opt->dst0opt = opt->dst1opt; 839 opt->dst1opt = NULL; 840 opt->opt_flen -= dsthdrlen; 841 } 842 843 break; 844 845 case IPV6_2292HOPLIMIT: 846 case IPV6_HOPLIMIT: 847 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 848 err = -EINVAL; 849 goto exit_f; 850 } 851 852 *hlimit = *(int *)CMSG_DATA(cmsg); 853 if (*hlimit < -1 || *hlimit > 0xff) { 854 err = -EINVAL; 855 goto exit_f; 856 } 857 858 break; 859 860 case IPV6_TCLASS: 861 { 862 int tc; 863 864 err = -EINVAL; 865 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 866 goto exit_f; 867 868 tc = *(int *)CMSG_DATA(cmsg); 869 if (tc < -1 || tc > 0xff) 870 goto exit_f; 871 872 err = 0; 873 *tclass = tc; 874 875 break; 876 } 877 878 case IPV6_DONTFRAG: 879 { 880 int df; 881 882 err = -EINVAL; 883 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 884 goto exit_f; 885 886 df = *(int *)CMSG_DATA(cmsg); 887 if (df < 0 || df > 1) 888 goto exit_f; 889 890 err = 0; 891 *dontfrag = df; 892 893 break; 894 } 895 default: 896 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", 897 cmsg->cmsg_type); 898 err = -EINVAL; 899 goto exit_f; 900 } 901 } 902 903 exit_f: 904 return err; 905 } 906 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 907 908 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 909 __u16 srcp, __u16 destp, int bucket) 910 { 911 const struct in6_addr *dest, *src; 912 913 dest = &sp->sk_v6_daddr; 914 src = &sp->sk_v6_rcv_saddr; 915 seq_printf(seq, 916 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 917 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 918 bucket, 919 src->s6_addr32[0], src->s6_addr32[1], 920 src->s6_addr32[2], src->s6_addr32[3], srcp, 921 dest->s6_addr32[0], dest->s6_addr32[1], 922 dest->s6_addr32[2], dest->s6_addr32[3], destp, 923 sp->sk_state, 924 sk_wmem_alloc_get(sp), 925 sk_rmem_alloc_get(sp), 926 0, 0L, 0, 927 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 928 0, 929 sock_i_ino(sp), 930 atomic_read(&sp->sk_refcnt), sp, 931 atomic_read(&sp->sk_drops)); 932 } 933