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