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