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 static void ip6_datagram_prepare_pktinfo_errqueue(struct sk_buff *skb) 329 { 330 int ifindex = skb->dev ? skb->dev->ifindex : -1; 331 332 if (skb->protocol == htons(ETH_P_IPV6)) 333 IP6CB(skb)->iif = ifindex; 334 else 335 PKTINFO_SKB_CB(skb)->ipi_ifindex = ifindex; 336 } 337 338 /* 339 * Handle MSG_ERRQUEUE 340 */ 341 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 342 { 343 struct ipv6_pinfo *np = inet6_sk(sk); 344 struct sock_exterr_skb *serr; 345 struct sk_buff *skb; 346 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 347 struct { 348 struct sock_extended_err ee; 349 struct sockaddr_in6 offender; 350 } errhdr; 351 int err; 352 int copied; 353 354 err = -EAGAIN; 355 skb = sock_dequeue_err_skb(sk); 356 if (skb == NULL) 357 goto out; 358 359 copied = skb->len; 360 if (copied > len) { 361 msg->msg_flags |= MSG_TRUNC; 362 copied = len; 363 } 364 err = skb_copy_datagram_msg(skb, 0, msg, copied); 365 if (err) 366 goto out_free_skb; 367 368 sock_recv_timestamp(msg, sk, skb); 369 370 serr = SKB_EXT_ERR(skb); 371 372 if (sin) { 373 const unsigned char *nh = skb_network_header(skb); 374 sin->sin6_family = AF_INET6; 375 sin->sin6_flowinfo = 0; 376 sin->sin6_port = serr->port; 377 if (skb->protocol == htons(ETH_P_IPV6)) { 378 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 379 struct ipv6hdr, daddr); 380 sin->sin6_addr = ip6h->daddr; 381 if (np->sndflow) 382 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 383 sin->sin6_scope_id = 384 ipv6_iface_scope_id(&sin->sin6_addr, 385 IP6CB(skb)->iif); 386 } else { 387 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 388 &sin->sin6_addr); 389 sin->sin6_scope_id = 0; 390 } 391 *addr_len = sizeof(*sin); 392 } 393 394 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 395 sin = &errhdr.offender; 396 sin->sin6_family = AF_UNSPEC; 397 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { 398 sin->sin6_family = AF_INET6; 399 sin->sin6_flowinfo = 0; 400 sin->sin6_port = 0; 401 if (np->rxopt.all) { 402 if (serr->ee.ee_origin != SO_EE_ORIGIN_ICMP && 403 serr->ee.ee_origin != SO_EE_ORIGIN_ICMP6) 404 ip6_datagram_prepare_pktinfo_errqueue(skb); 405 ip6_datagram_recv_common_ctl(sk, msg, skb); 406 } 407 if (skb->protocol == htons(ETH_P_IPV6)) { 408 sin->sin6_addr = ipv6_hdr(skb)->saddr; 409 if (np->rxopt.all) 410 ip6_datagram_recv_specific_ctl(sk, msg, skb); 411 sin->sin6_scope_id = 412 ipv6_iface_scope_id(&sin->sin6_addr, 413 IP6CB(skb)->iif); 414 } else { 415 struct inet_sock *inet = inet_sk(sk); 416 417 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 418 &sin->sin6_addr); 419 sin->sin6_scope_id = 0; 420 if (inet->cmsg_flags) 421 ip_cmsg_recv(msg, skb); 422 } 423 } 424 425 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 426 427 /* Now we could try to dump offended packet options */ 428 429 msg->msg_flags |= MSG_ERRQUEUE; 430 err = copied; 431 432 out_free_skb: 433 kfree_skb(skb); 434 out: 435 return err; 436 } 437 EXPORT_SYMBOL_GPL(ipv6_recv_error); 438 439 /* 440 * Handle IPV6_RECVPATHMTU 441 */ 442 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 443 int *addr_len) 444 { 445 struct ipv6_pinfo *np = inet6_sk(sk); 446 struct sk_buff *skb; 447 struct ip6_mtuinfo mtu_info; 448 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 449 int err; 450 int copied; 451 452 err = -EAGAIN; 453 skb = xchg(&np->rxpmtu, NULL); 454 if (skb == NULL) 455 goto out; 456 457 copied = skb->len; 458 if (copied > len) { 459 msg->msg_flags |= MSG_TRUNC; 460 copied = len; 461 } 462 err = skb_copy_datagram_msg(skb, 0, msg, copied); 463 if (err) 464 goto out_free_skb; 465 466 sock_recv_timestamp(msg, sk, skb); 467 468 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 469 470 if (sin) { 471 sin->sin6_family = AF_INET6; 472 sin->sin6_flowinfo = 0; 473 sin->sin6_port = 0; 474 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 475 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 476 *addr_len = sizeof(*sin); 477 } 478 479 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 480 481 err = copied; 482 483 out_free_skb: 484 kfree_skb(skb); 485 out: 486 return err; 487 } 488 489 490 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 491 struct sk_buff *skb) 492 { 493 struct ipv6_pinfo *np = inet6_sk(sk); 494 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 495 496 if (np->rxopt.bits.rxinfo) { 497 struct in6_pktinfo src_info; 498 499 if (is_ipv6) { 500 src_info.ipi6_ifindex = IP6CB(skb)->iif; 501 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 502 } else { 503 src_info.ipi6_ifindex = 504 PKTINFO_SKB_CB(skb)->ipi_ifindex; 505 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 506 &src_info.ipi6_addr); 507 } 508 509 if (src_info.ipi6_ifindex >= 0) 510 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 511 sizeof(src_info), &src_info); 512 } 513 } 514 515 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 516 struct sk_buff *skb) 517 { 518 struct ipv6_pinfo *np = inet6_sk(sk); 519 struct inet6_skb_parm *opt = IP6CB(skb); 520 unsigned char *nh = skb_network_header(skb); 521 522 if (np->rxopt.bits.rxhlim) { 523 int hlim = ipv6_hdr(skb)->hop_limit; 524 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 525 } 526 527 if (np->rxopt.bits.rxtclass) { 528 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 529 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 530 } 531 532 if (np->rxopt.bits.rxflow) { 533 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 534 if (flowinfo) 535 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 536 } 537 538 /* HbH is allowed only once */ 539 if (np->rxopt.bits.hopopts && opt->hop) { 540 u8 *ptr = nh + opt->hop; 541 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 542 } 543 544 if (opt->lastopt && 545 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 546 /* 547 * Silly enough, but we need to reparse in order to 548 * report extension headers (except for HbH) 549 * in order. 550 * 551 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 552 * (and WILL NOT be) defined because 553 * IPV6_RECVDSTOPTS is more generic. --yoshfuji 554 */ 555 unsigned int off = sizeof(struct ipv6hdr); 556 u8 nexthdr = ipv6_hdr(skb)->nexthdr; 557 558 while (off <= opt->lastopt) { 559 unsigned int len; 560 u8 *ptr = nh + off; 561 562 switch (nexthdr) { 563 case IPPROTO_DSTOPTS: 564 nexthdr = ptr[0]; 565 len = (ptr[1] + 1) << 3; 566 if (np->rxopt.bits.dstopts) 567 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 568 break; 569 case IPPROTO_ROUTING: 570 nexthdr = ptr[0]; 571 len = (ptr[1] + 1) << 3; 572 if (np->rxopt.bits.srcrt) 573 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 574 break; 575 case IPPROTO_AH: 576 nexthdr = ptr[0]; 577 len = (ptr[1] + 2) << 2; 578 break; 579 default: 580 nexthdr = ptr[0]; 581 len = (ptr[1] + 1) << 3; 582 break; 583 } 584 585 off += len; 586 } 587 } 588 589 /* socket options in old style */ 590 if (np->rxopt.bits.rxoinfo) { 591 struct in6_pktinfo src_info; 592 593 src_info.ipi6_ifindex = opt->iif; 594 src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 595 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 596 } 597 if (np->rxopt.bits.rxohlim) { 598 int hlim = ipv6_hdr(skb)->hop_limit; 599 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 600 } 601 if (np->rxopt.bits.ohopopts && opt->hop) { 602 u8 *ptr = nh + opt->hop; 603 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 604 } 605 if (np->rxopt.bits.odstopts && opt->dst0) { 606 u8 *ptr = nh + opt->dst0; 607 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 608 } 609 if (np->rxopt.bits.osrcrt && opt->srcrt) { 610 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 611 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 612 } 613 if (np->rxopt.bits.odstopts && opt->dst1) { 614 u8 *ptr = nh + opt->dst1; 615 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 616 } 617 if (np->rxopt.bits.rxorigdstaddr) { 618 struct sockaddr_in6 sin6; 619 __be16 *ports = (__be16 *) skb_transport_header(skb); 620 621 if (skb_transport_offset(skb) + 4 <= skb->len) { 622 /* All current transport protocols have the port numbers in the 623 * first four bytes of the transport header and this function is 624 * written with this assumption in mind. 625 */ 626 627 sin6.sin6_family = AF_INET6; 628 sin6.sin6_addr = ipv6_hdr(skb)->daddr; 629 sin6.sin6_port = ports[1]; 630 sin6.sin6_flowinfo = 0; 631 sin6.sin6_scope_id = 632 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 633 opt->iif); 634 635 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 636 } 637 } 638 } 639 640 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 641 struct sk_buff *skb) 642 { 643 ip6_datagram_recv_common_ctl(sk, msg, skb); 644 ip6_datagram_recv_specific_ctl(sk, msg, skb); 645 } 646 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 647 648 int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 649 struct msghdr *msg, struct flowi6 *fl6, 650 struct ipv6_txoptions *opt, 651 int *hlimit, int *tclass, int *dontfrag) 652 { 653 struct in6_pktinfo *src_info; 654 struct cmsghdr *cmsg; 655 struct ipv6_rt_hdr *rthdr; 656 struct ipv6_opt_hdr *hdr; 657 int len; 658 int err = 0; 659 660 for_each_cmsghdr(cmsg, msg) { 661 int addr_type; 662 663 if (!CMSG_OK(msg, cmsg)) { 664 err = -EINVAL; 665 goto exit_f; 666 } 667 668 if (cmsg->cmsg_level != SOL_IPV6) 669 continue; 670 671 switch (cmsg->cmsg_type) { 672 case IPV6_PKTINFO: 673 case IPV6_2292PKTINFO: 674 { 675 struct net_device *dev = NULL; 676 677 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 678 err = -EINVAL; 679 goto exit_f; 680 } 681 682 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 683 684 if (src_info->ipi6_ifindex) { 685 if (fl6->flowi6_oif && 686 src_info->ipi6_ifindex != fl6->flowi6_oif) 687 return -EINVAL; 688 fl6->flowi6_oif = src_info->ipi6_ifindex; 689 } 690 691 addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 692 693 rcu_read_lock(); 694 if (fl6->flowi6_oif) { 695 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 696 if (!dev) { 697 rcu_read_unlock(); 698 return -ENODEV; 699 } 700 } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 701 rcu_read_unlock(); 702 return -EINVAL; 703 } 704 705 if (addr_type != IPV6_ADDR_ANY) { 706 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 707 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 708 !ipv6_chk_addr(net, &src_info->ipi6_addr, 709 strict ? dev : NULL, 0) && 710 !ipv6_chk_acast_addr_src(net, dev, 711 &src_info->ipi6_addr)) 712 err = -EINVAL; 713 else 714 fl6->saddr = src_info->ipi6_addr; 715 } 716 717 rcu_read_unlock(); 718 719 if (err) 720 goto exit_f; 721 722 break; 723 } 724 725 case IPV6_FLOWINFO: 726 if (cmsg->cmsg_len < CMSG_LEN(4)) { 727 err = -EINVAL; 728 goto exit_f; 729 } 730 731 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 732 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 733 err = -EINVAL; 734 goto exit_f; 735 } 736 } 737 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 738 break; 739 740 case IPV6_2292HOPOPTS: 741 case IPV6_HOPOPTS: 742 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 743 err = -EINVAL; 744 goto exit_f; 745 } 746 747 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 748 len = ((hdr->hdrlen + 1) << 3); 749 if (cmsg->cmsg_len < CMSG_LEN(len)) { 750 err = -EINVAL; 751 goto exit_f; 752 } 753 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 754 err = -EPERM; 755 goto exit_f; 756 } 757 opt->opt_nflen += len; 758 opt->hopopt = hdr; 759 break; 760 761 case IPV6_2292DSTOPTS: 762 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 763 err = -EINVAL; 764 goto exit_f; 765 } 766 767 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 768 len = ((hdr->hdrlen + 1) << 3); 769 if (cmsg->cmsg_len < CMSG_LEN(len)) { 770 err = -EINVAL; 771 goto exit_f; 772 } 773 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 774 err = -EPERM; 775 goto exit_f; 776 } 777 if (opt->dst1opt) { 778 err = -EINVAL; 779 goto exit_f; 780 } 781 opt->opt_flen += len; 782 opt->dst1opt = hdr; 783 break; 784 785 case IPV6_DSTOPTS: 786 case IPV6_RTHDRDSTOPTS: 787 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 788 err = -EINVAL; 789 goto exit_f; 790 } 791 792 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 793 len = ((hdr->hdrlen + 1) << 3); 794 if (cmsg->cmsg_len < CMSG_LEN(len)) { 795 err = -EINVAL; 796 goto exit_f; 797 } 798 if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 799 err = -EPERM; 800 goto exit_f; 801 } 802 if (cmsg->cmsg_type == IPV6_DSTOPTS) { 803 opt->opt_flen += len; 804 opt->dst1opt = hdr; 805 } else { 806 opt->opt_nflen += len; 807 opt->dst0opt = hdr; 808 } 809 break; 810 811 case IPV6_2292RTHDR: 812 case IPV6_RTHDR: 813 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 814 err = -EINVAL; 815 goto exit_f; 816 } 817 818 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 819 820 switch (rthdr->type) { 821 #if IS_ENABLED(CONFIG_IPV6_MIP6) 822 case IPV6_SRCRT_TYPE_2: 823 if (rthdr->hdrlen != 2 || 824 rthdr->segments_left != 1) { 825 err = -EINVAL; 826 goto exit_f; 827 } 828 break; 829 #endif 830 default: 831 err = -EINVAL; 832 goto exit_f; 833 } 834 835 len = ((rthdr->hdrlen + 1) << 3); 836 837 if (cmsg->cmsg_len < CMSG_LEN(len)) { 838 err = -EINVAL; 839 goto exit_f; 840 } 841 842 /* segments left must also match */ 843 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 844 err = -EINVAL; 845 goto exit_f; 846 } 847 848 opt->opt_nflen += len; 849 opt->srcrt = rthdr; 850 851 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 852 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 853 854 opt->opt_nflen += dsthdrlen; 855 opt->dst0opt = opt->dst1opt; 856 opt->dst1opt = NULL; 857 opt->opt_flen -= dsthdrlen; 858 } 859 860 break; 861 862 case IPV6_2292HOPLIMIT: 863 case IPV6_HOPLIMIT: 864 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 865 err = -EINVAL; 866 goto exit_f; 867 } 868 869 *hlimit = *(int *)CMSG_DATA(cmsg); 870 if (*hlimit < -1 || *hlimit > 0xff) { 871 err = -EINVAL; 872 goto exit_f; 873 } 874 875 break; 876 877 case IPV6_TCLASS: 878 { 879 int tc; 880 881 err = -EINVAL; 882 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 883 goto exit_f; 884 885 tc = *(int *)CMSG_DATA(cmsg); 886 if (tc < -1 || tc > 0xff) 887 goto exit_f; 888 889 err = 0; 890 *tclass = tc; 891 892 break; 893 } 894 895 case IPV6_DONTFRAG: 896 { 897 int df; 898 899 err = -EINVAL; 900 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 901 goto exit_f; 902 903 df = *(int *)CMSG_DATA(cmsg); 904 if (df < 0 || df > 1) 905 goto exit_f; 906 907 err = 0; 908 *dontfrag = df; 909 910 break; 911 } 912 default: 913 net_dbg_ratelimited("invalid cmsg type: %d\n", 914 cmsg->cmsg_type); 915 err = -EINVAL; 916 goto exit_f; 917 } 918 } 919 920 exit_f: 921 return err; 922 } 923 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 924 925 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 926 __u16 srcp, __u16 destp, int bucket) 927 { 928 const struct in6_addr *dest, *src; 929 930 dest = &sp->sk_v6_daddr; 931 src = &sp->sk_v6_rcv_saddr; 932 seq_printf(seq, 933 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 934 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 935 bucket, 936 src->s6_addr32[0], src->s6_addr32[1], 937 src->s6_addr32[2], src->s6_addr32[3], srcp, 938 dest->s6_addr32[0], dest->s6_addr32[1], 939 dest->s6_addr32[2], dest->s6_addr32[3], destp, 940 sp->sk_state, 941 sk_wmem_alloc_get(sp), 942 sk_rmem_alloc_get(sp), 943 0, 0L, 0, 944 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 945 0, 946 sock_i_ino(sp), 947 atomic_read(&sp->sk_refcnt), sp, 948 atomic_read(&sp->sk_drops)); 949 } 950