1 /* 2 * UDP over IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/udp.c 9 * 10 * Fixes: 11 * Hideaki YOSHIFUJI : sin6_scope_id support 12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14 * a single port at the same time. 15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 */ 23 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/ipv6.h> 33 #include <linux/icmpv6.h> 34 #include <linux/init.h> 35 #include <linux/module.h> 36 #include <linux/skbuff.h> 37 #include <linux/slab.h> 38 #include <asm/uaccess.h> 39 40 #include <net/addrconf.h> 41 #include <net/ndisc.h> 42 #include <net/protocol.h> 43 #include <net/transp_v6.h> 44 #include <net/ip6_route.h> 45 #include <net/raw.h> 46 #include <net/tcp_states.h> 47 #include <net/ip6_checksum.h> 48 #include <net/xfrm.h> 49 #include <net/inet6_hashtables.h> 50 #include <net/busy_poll.h> 51 #include <net/sock_reuseport.h> 52 53 #include <linux/proc_fs.h> 54 #include <linux/seq_file.h> 55 #include <trace/events/skb.h> 56 #include "udp_impl.h" 57 58 static u32 udp6_ehashfn(const struct net *net, 59 const struct in6_addr *laddr, 60 const u16 lport, 61 const struct in6_addr *faddr, 62 const __be16 fport) 63 { 64 static u32 udp6_ehash_secret __read_mostly; 65 static u32 udp_ipv6_hash_secret __read_mostly; 66 67 u32 lhash, fhash; 68 69 net_get_random_once(&udp6_ehash_secret, 70 sizeof(udp6_ehash_secret)); 71 net_get_random_once(&udp_ipv6_hash_secret, 72 sizeof(udp_ipv6_hash_secret)); 73 74 lhash = (__force u32)laddr->s6_addr32[3]; 75 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 76 77 return __inet6_ehashfn(lhash, lport, fhash, fport, 78 udp_ipv6_hash_secret + net_hash_mix(net)); 79 } 80 81 static u32 udp6_portaddr_hash(const struct net *net, 82 const struct in6_addr *addr6, 83 unsigned int port) 84 { 85 unsigned int hash, mix = net_hash_mix(net); 86 87 if (ipv6_addr_any(addr6)) 88 hash = jhash_1word(0, mix); 89 else if (ipv6_addr_v4mapped(addr6)) 90 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 91 else 92 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 93 94 return hash ^ port; 95 } 96 97 int udp_v6_get_port(struct sock *sk, unsigned short snum) 98 { 99 unsigned int hash2_nulladdr = 100 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 101 unsigned int hash2_partial = 102 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 103 104 /* precompute partial secondary hash */ 105 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 106 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 107 } 108 109 static void udp_v6_rehash(struct sock *sk) 110 { 111 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 112 &sk->sk_v6_rcv_saddr, 113 inet_sk(sk)->inet_num); 114 115 udp_lib_rehash(sk, new_hash); 116 } 117 118 static int compute_score(struct sock *sk, struct net *net, 119 const struct in6_addr *saddr, __be16 sport, 120 const struct in6_addr *daddr, unsigned short hnum, 121 int dif) 122 { 123 int score; 124 struct inet_sock *inet; 125 126 if (!net_eq(sock_net(sk), net) || 127 udp_sk(sk)->udp_port_hash != hnum || 128 sk->sk_family != PF_INET6) 129 return -1; 130 131 score = 0; 132 inet = inet_sk(sk); 133 134 if (inet->inet_dport) { 135 if (inet->inet_dport != sport) 136 return -1; 137 score++; 138 } 139 140 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 141 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 142 return -1; 143 score++; 144 } 145 146 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 147 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 148 return -1; 149 score++; 150 } 151 152 if (sk->sk_bound_dev_if) { 153 if (sk->sk_bound_dev_if != dif) 154 return -1; 155 score++; 156 } 157 158 if (sk->sk_incoming_cpu == raw_smp_processor_id()) 159 score++; 160 161 return score; 162 } 163 164 /* called with rcu_read_lock() */ 165 static struct sock *udp6_lib_lookup2(struct net *net, 166 const struct in6_addr *saddr, __be16 sport, 167 const struct in6_addr *daddr, unsigned int hnum, int dif, 168 struct udp_hslot *hslot2, 169 struct sk_buff *skb) 170 { 171 struct sock *sk, *result; 172 int score, badness, matches = 0, reuseport = 0; 173 u32 hash = 0; 174 175 result = NULL; 176 badness = -1; 177 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 178 score = compute_score(sk, net, saddr, sport, 179 daddr, hnum, dif); 180 if (score > badness) { 181 reuseport = sk->sk_reuseport; 182 if (reuseport) { 183 hash = udp6_ehashfn(net, daddr, hnum, 184 saddr, sport); 185 186 result = reuseport_select_sock(sk, hash, skb, 187 sizeof(struct udphdr)); 188 if (result) 189 return result; 190 matches = 1; 191 } 192 result = sk; 193 badness = score; 194 } else if (score == badness && reuseport) { 195 matches++; 196 if (reciprocal_scale(hash, matches) == 0) 197 result = sk; 198 hash = next_pseudo_random32(hash); 199 } 200 } 201 return result; 202 } 203 204 /* rcu_read_lock() must be held */ 205 struct sock *__udp6_lib_lookup(struct net *net, 206 const struct in6_addr *saddr, __be16 sport, 207 const struct in6_addr *daddr, __be16 dport, 208 int dif, struct udp_table *udptable, 209 struct sk_buff *skb) 210 { 211 struct sock *sk, *result; 212 unsigned short hnum = ntohs(dport); 213 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 214 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 215 int score, badness, matches = 0, reuseport = 0; 216 u32 hash = 0; 217 218 if (hslot->count > 10) { 219 hash2 = udp6_portaddr_hash(net, daddr, hnum); 220 slot2 = hash2 & udptable->mask; 221 hslot2 = &udptable->hash2[slot2]; 222 if (hslot->count < hslot2->count) 223 goto begin; 224 225 result = udp6_lib_lookup2(net, saddr, sport, 226 daddr, hnum, dif, 227 hslot2, skb); 228 if (!result) { 229 unsigned int old_slot2 = slot2; 230 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 231 slot2 = hash2 & udptable->mask; 232 /* avoid searching the same slot again. */ 233 if (unlikely(slot2 == old_slot2)) 234 return result; 235 236 hslot2 = &udptable->hash2[slot2]; 237 if (hslot->count < hslot2->count) 238 goto begin; 239 240 result = udp6_lib_lookup2(net, saddr, sport, 241 daddr, hnum, dif, 242 hslot2, skb); 243 } 244 return result; 245 } 246 begin: 247 result = NULL; 248 badness = -1; 249 sk_for_each_rcu(sk, &hslot->head) { 250 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif); 251 if (score > badness) { 252 reuseport = sk->sk_reuseport; 253 if (reuseport) { 254 hash = udp6_ehashfn(net, daddr, hnum, 255 saddr, sport); 256 result = reuseport_select_sock(sk, hash, skb, 257 sizeof(struct udphdr)); 258 if (result) 259 return result; 260 matches = 1; 261 } 262 result = sk; 263 badness = score; 264 } else if (score == badness && reuseport) { 265 matches++; 266 if (reciprocal_scale(hash, matches) == 0) 267 result = sk; 268 hash = next_pseudo_random32(hash); 269 } 270 } 271 return result; 272 } 273 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 274 275 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 276 __be16 sport, __be16 dport, 277 struct udp_table *udptable) 278 { 279 const struct ipv6hdr *iph = ipv6_hdr(skb); 280 struct sock *sk; 281 282 sk = skb_steal_sock(skb); 283 if (unlikely(sk)) 284 return sk; 285 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 286 &iph->daddr, dport, inet6_iif(skb), 287 udptable, skb); 288 } 289 290 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, 291 __be16 sport, __be16 dport) 292 { 293 const struct ipv6hdr *iph = ipv6_hdr(skb); 294 295 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 296 &iph->daddr, dport, inet6_iif(skb), 297 &udp_table, skb); 298 } 299 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); 300 301 /* Must be called under rcu_read_lock(). 302 * Does increment socket refcount. 303 */ 304 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ 305 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) 306 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 307 const struct in6_addr *daddr, __be16 dport, int dif) 308 { 309 struct sock *sk; 310 311 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 312 dif, &udp_table, NULL); 313 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) 314 sk = NULL; 315 return sk; 316 } 317 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 318 #endif 319 320 /* 321 * This should be easy, if there is something there we 322 * return it, otherwise we block. 323 */ 324 325 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 326 int noblock, int flags, int *addr_len) 327 { 328 struct ipv6_pinfo *np = inet6_sk(sk); 329 struct inet_sock *inet = inet_sk(sk); 330 struct sk_buff *skb; 331 unsigned int ulen, copied; 332 int peeked, peeking, off; 333 int err; 334 int is_udplite = IS_UDPLITE(sk); 335 bool checksum_valid = false; 336 int is_udp4; 337 bool slow; 338 339 if (flags & MSG_ERRQUEUE) 340 return ipv6_recv_error(sk, msg, len, addr_len); 341 342 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 343 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 344 345 try_again: 346 peeking = off = sk_peek_offset(sk, flags); 347 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 348 &peeked, &off, &err); 349 if (!skb) 350 return err; 351 352 ulen = skb->len; 353 copied = len; 354 if (copied > ulen - off) 355 copied = ulen - off; 356 else if (copied < ulen) 357 msg->msg_flags |= MSG_TRUNC; 358 359 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 360 361 /* 362 * If checksum is needed at all, try to do it while copying the 363 * data. If the data is truncated, or if we only want a partial 364 * coverage checksum (UDP-Lite), do it before the copy. 365 */ 366 367 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) { 368 checksum_valid = !udp_lib_checksum_complete(skb); 369 if (!checksum_valid) 370 goto csum_copy_err; 371 } 372 373 if (checksum_valid || skb_csum_unnecessary(skb)) 374 err = skb_copy_datagram_msg(skb, off, msg, copied); 375 else { 376 err = skb_copy_and_csum_datagram_msg(skb, off, msg); 377 if (err == -EINVAL) 378 goto csum_copy_err; 379 } 380 if (unlikely(err)) { 381 trace_kfree_skb(skb, udpv6_recvmsg); 382 if (!peeked) { 383 atomic_inc(&sk->sk_drops); 384 if (is_udp4) 385 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 386 is_udplite); 387 else 388 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 389 is_udplite); 390 } 391 skb_free_datagram_locked(sk, skb); 392 return err; 393 } 394 if (!peeked) { 395 if (is_udp4) 396 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 397 is_udplite); 398 else 399 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 400 is_udplite); 401 } 402 403 sock_recv_ts_and_drops(msg, sk, skb); 404 405 /* Copy the address. */ 406 if (msg->msg_name) { 407 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 408 sin6->sin6_family = AF_INET6; 409 sin6->sin6_port = udp_hdr(skb)->source; 410 sin6->sin6_flowinfo = 0; 411 412 if (is_udp4) { 413 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 414 &sin6->sin6_addr); 415 sin6->sin6_scope_id = 0; 416 } else { 417 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 418 sin6->sin6_scope_id = 419 ipv6_iface_scope_id(&sin6->sin6_addr, 420 inet6_iif(skb)); 421 } 422 *addr_len = sizeof(*sin6); 423 } 424 425 if (np->rxopt.all) 426 ip6_datagram_recv_common_ctl(sk, msg, skb); 427 428 if (is_udp4) { 429 if (inet->cmsg_flags) 430 ip_cmsg_recv_offset(msg, skb, 431 sizeof(struct udphdr), off); 432 } else { 433 if (np->rxopt.all) 434 ip6_datagram_recv_specific_ctl(sk, msg, skb); 435 } 436 437 err = copied; 438 if (flags & MSG_TRUNC) 439 err = ulen; 440 441 __skb_free_datagram_locked(sk, skb, peeking ? -err : err); 442 return err; 443 444 csum_copy_err: 445 slow = lock_sock_fast(sk); 446 if (!skb_kill_datagram(sk, skb, flags)) { 447 if (is_udp4) { 448 UDP_INC_STATS(sock_net(sk), 449 UDP_MIB_CSUMERRORS, is_udplite); 450 UDP_INC_STATS(sock_net(sk), 451 UDP_MIB_INERRORS, is_udplite); 452 } else { 453 UDP6_INC_STATS(sock_net(sk), 454 UDP_MIB_CSUMERRORS, is_udplite); 455 UDP6_INC_STATS(sock_net(sk), 456 UDP_MIB_INERRORS, is_udplite); 457 } 458 } 459 unlock_sock_fast(sk, slow); 460 461 /* starting over for a new packet, but check if we need to yield */ 462 cond_resched(); 463 msg->msg_flags &= ~MSG_TRUNC; 464 goto try_again; 465 } 466 467 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 468 u8 type, u8 code, int offset, __be32 info, 469 struct udp_table *udptable) 470 { 471 struct ipv6_pinfo *np; 472 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 473 const struct in6_addr *saddr = &hdr->saddr; 474 const struct in6_addr *daddr = &hdr->daddr; 475 struct udphdr *uh = (struct udphdr *)(skb->data+offset); 476 struct sock *sk; 477 int harderr; 478 int err; 479 struct net *net = dev_net(skb->dev); 480 481 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 482 inet6_iif(skb), udptable, skb); 483 if (!sk) { 484 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 485 ICMP6_MIB_INERRORS); 486 return; 487 } 488 489 harderr = icmpv6_err_convert(type, code, &err); 490 np = inet6_sk(sk); 491 492 if (type == ICMPV6_PKT_TOOBIG) { 493 if (!ip6_sk_accept_pmtu(sk)) 494 goto out; 495 ip6_sk_update_pmtu(skb, sk, info); 496 if (np->pmtudisc != IPV6_PMTUDISC_DONT) 497 harderr = 1; 498 } 499 if (type == NDISC_REDIRECT) { 500 ip6_sk_redirect(skb, sk); 501 goto out; 502 } 503 504 if (!np->recverr) { 505 if (!harderr || sk->sk_state != TCP_ESTABLISHED) 506 goto out; 507 } else { 508 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 509 } 510 511 sk->sk_err = err; 512 sk->sk_error_report(sk); 513 out: 514 return; 515 } 516 517 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 518 { 519 int rc; 520 521 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 522 sock_rps_save_rxhash(sk, skb); 523 sk_mark_napi_id(sk, skb); 524 sk_incoming_cpu_update(sk); 525 } 526 527 rc = __sock_queue_rcv_skb(sk, skb); 528 if (rc < 0) { 529 int is_udplite = IS_UDPLITE(sk); 530 531 /* Note that an ENOMEM error is charged twice */ 532 if (rc == -ENOMEM) 533 UDP6_INC_STATS(sock_net(sk), 534 UDP_MIB_RCVBUFERRORS, is_udplite); 535 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 536 kfree_skb(skb); 537 return -1; 538 } 539 return 0; 540 } 541 542 static __inline__ void udpv6_err(struct sk_buff *skb, 543 struct inet6_skb_parm *opt, u8 type, 544 u8 code, int offset, __be32 info) 545 { 546 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 547 } 548 549 static struct static_key udpv6_encap_needed __read_mostly; 550 void udpv6_encap_enable(void) 551 { 552 if (!static_key_enabled(&udpv6_encap_needed)) 553 static_key_slow_inc(&udpv6_encap_needed); 554 } 555 EXPORT_SYMBOL(udpv6_encap_enable); 556 557 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 558 { 559 struct udp_sock *up = udp_sk(sk); 560 int rc; 561 int is_udplite = IS_UDPLITE(sk); 562 563 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 564 goto drop; 565 566 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 567 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 568 569 /* 570 * This is an encapsulation socket so pass the skb to 571 * the socket's udp_encap_rcv() hook. Otherwise, just 572 * fall through and pass this up the UDP socket. 573 * up->encap_rcv() returns the following value: 574 * =0 if skb was successfully passed to the encap 575 * handler or was discarded by it. 576 * >0 if skb should be passed on to UDP. 577 * <0 if skb should be resubmitted as proto -N 578 */ 579 580 /* if we're overly short, let UDP handle it */ 581 encap_rcv = ACCESS_ONCE(up->encap_rcv); 582 if (encap_rcv) { 583 int ret; 584 585 /* Verify checksum before giving to encap */ 586 if (udp_lib_checksum_complete(skb)) 587 goto csum_error; 588 589 ret = encap_rcv(sk, skb); 590 if (ret <= 0) { 591 __UDP_INC_STATS(sock_net(sk), 592 UDP_MIB_INDATAGRAMS, 593 is_udplite); 594 return -ret; 595 } 596 } 597 598 /* FALLTHROUGH -- it's a UDP Packet */ 599 } 600 601 /* 602 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 603 */ 604 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 605 606 if (up->pcrlen == 0) { /* full coverage was set */ 607 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 608 UDP_SKB_CB(skb)->cscov, skb->len); 609 goto drop; 610 } 611 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 612 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 613 UDP_SKB_CB(skb)->cscov, up->pcrlen); 614 goto drop; 615 } 616 } 617 618 if (rcu_access_pointer(sk->sk_filter) && 619 udp_lib_checksum_complete(skb)) 620 goto csum_error; 621 622 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 623 goto drop; 624 625 udp_csum_pull_header(skb); 626 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { 627 __UDP6_INC_STATS(sock_net(sk), 628 UDP_MIB_RCVBUFERRORS, is_udplite); 629 goto drop; 630 } 631 632 skb_dst_drop(skb); 633 634 bh_lock_sock(sk); 635 rc = 0; 636 if (!sock_owned_by_user(sk)) 637 rc = __udpv6_queue_rcv_skb(sk, skb); 638 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 639 bh_unlock_sock(sk); 640 goto drop; 641 } 642 bh_unlock_sock(sk); 643 644 return rc; 645 646 csum_error: 647 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 648 drop: 649 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 650 atomic_inc(&sk->sk_drops); 651 kfree_skb(skb); 652 return -1; 653 } 654 655 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 656 __be16 loc_port, const struct in6_addr *loc_addr, 657 __be16 rmt_port, const struct in6_addr *rmt_addr, 658 int dif, unsigned short hnum) 659 { 660 struct inet_sock *inet = inet_sk(sk); 661 662 if (!net_eq(sock_net(sk), net)) 663 return false; 664 665 if (udp_sk(sk)->udp_port_hash != hnum || 666 sk->sk_family != PF_INET6 || 667 (inet->inet_dport && inet->inet_dport != rmt_port) || 668 (!ipv6_addr_any(&sk->sk_v6_daddr) && 669 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 670 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || 671 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 672 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 673 return false; 674 if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 675 return false; 676 return true; 677 } 678 679 static void udp6_csum_zero_error(struct sk_buff *skb) 680 { 681 /* RFC 2460 section 8.1 says that we SHOULD log 682 * this error. Well, it is reasonable. 683 */ 684 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 685 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 686 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 687 } 688 689 /* 690 * Note: called only from the BH handler context, 691 * so we don't need to lock the hashes. 692 */ 693 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 694 const struct in6_addr *saddr, const struct in6_addr *daddr, 695 struct udp_table *udptable, int proto) 696 { 697 struct sock *sk, *first = NULL; 698 const struct udphdr *uh = udp_hdr(skb); 699 unsigned short hnum = ntohs(uh->dest); 700 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 701 unsigned int offset = offsetof(typeof(*sk), sk_node); 702 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 703 int dif = inet6_iif(skb); 704 struct hlist_node *node; 705 struct sk_buff *nskb; 706 707 if (use_hash2) { 708 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & 709 udp_table.mask; 710 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; 711 start_lookup: 712 hslot = &udp_table.hash2[hash2]; 713 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 714 } 715 716 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 717 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 718 uh->source, saddr, dif, hnum)) 719 continue; 720 /* If zero checksum and no_check is not on for 721 * the socket then skip it. 722 */ 723 if (!uh->check && !udp_sk(sk)->no_check6_rx) 724 continue; 725 if (!first) { 726 first = sk; 727 continue; 728 } 729 nskb = skb_clone(skb, GFP_ATOMIC); 730 if (unlikely(!nskb)) { 731 atomic_inc(&sk->sk_drops); 732 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 733 IS_UDPLITE(sk)); 734 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 735 IS_UDPLITE(sk)); 736 continue; 737 } 738 739 if (udpv6_queue_rcv_skb(sk, nskb) > 0) 740 consume_skb(nskb); 741 } 742 743 /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 744 if (use_hash2 && hash2 != hash2_any) { 745 hash2 = hash2_any; 746 goto start_lookup; 747 } 748 749 if (first) { 750 if (udpv6_queue_rcv_skb(first, skb) > 0) 751 consume_skb(skb); 752 } else { 753 kfree_skb(skb); 754 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 755 proto == IPPROTO_UDPLITE); 756 } 757 return 0; 758 } 759 760 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 761 int proto) 762 { 763 const struct in6_addr *saddr, *daddr; 764 struct net *net = dev_net(skb->dev); 765 struct udphdr *uh; 766 struct sock *sk; 767 u32 ulen = 0; 768 769 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 770 goto discard; 771 772 saddr = &ipv6_hdr(skb)->saddr; 773 daddr = &ipv6_hdr(skb)->daddr; 774 uh = udp_hdr(skb); 775 776 ulen = ntohs(uh->len); 777 if (ulen > skb->len) 778 goto short_packet; 779 780 if (proto == IPPROTO_UDP) { 781 /* UDP validates ulen. */ 782 783 /* Check for jumbo payload */ 784 if (ulen == 0) 785 ulen = skb->len; 786 787 if (ulen < sizeof(*uh)) 788 goto short_packet; 789 790 if (ulen < skb->len) { 791 if (pskb_trim_rcsum(skb, ulen)) 792 goto short_packet; 793 saddr = &ipv6_hdr(skb)->saddr; 794 daddr = &ipv6_hdr(skb)->daddr; 795 uh = udp_hdr(skb); 796 } 797 } 798 799 if (udp6_csum_init(skb, uh, proto)) 800 goto csum_error; 801 802 /* 803 * Multicast receive code 804 */ 805 if (ipv6_addr_is_multicast(daddr)) 806 return __udp6_lib_mcast_deliver(net, skb, 807 saddr, daddr, udptable, proto); 808 809 /* Unicast */ 810 811 /* 812 * check socket cache ... must talk to Alan about his plans 813 * for sock caches... i'll skip this for now. 814 */ 815 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 816 if (sk) { 817 int ret; 818 819 if (!uh->check && !udp_sk(sk)->no_check6_rx) { 820 udp6_csum_zero_error(skb); 821 goto csum_error; 822 } 823 824 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 825 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 826 ip6_compute_pseudo); 827 828 ret = udpv6_queue_rcv_skb(sk, skb); 829 830 /* a return value > 0 means to resubmit the input */ 831 if (ret > 0) 832 return ret; 833 834 return 0; 835 } 836 837 if (!uh->check) { 838 udp6_csum_zero_error(skb); 839 goto csum_error; 840 } 841 842 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 843 goto discard; 844 845 if (udp_lib_checksum_complete(skb)) 846 goto csum_error; 847 848 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 849 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 850 851 kfree_skb(skb); 852 return 0; 853 854 short_packet: 855 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 856 proto == IPPROTO_UDPLITE ? "-Lite" : "", 857 saddr, ntohs(uh->source), 858 ulen, skb->len, 859 daddr, ntohs(uh->dest)); 860 goto discard; 861 csum_error: 862 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 863 discard: 864 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 865 kfree_skb(skb); 866 return 0; 867 } 868 869 static __inline__ int udpv6_rcv(struct sk_buff *skb) 870 { 871 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 872 } 873 874 /* 875 * Throw away all pending data and cancel the corking. Socket is locked. 876 */ 877 static void udp_v6_flush_pending_frames(struct sock *sk) 878 { 879 struct udp_sock *up = udp_sk(sk); 880 881 if (up->pending == AF_INET) 882 udp_flush_pending_frames(sk); 883 else if (up->pending) { 884 up->len = 0; 885 up->pending = 0; 886 ip6_flush_pending_frames(sk); 887 } 888 } 889 890 /** 891 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 892 * @sk: socket we are sending on 893 * @skb: sk_buff containing the filled-in UDP header 894 * (checksum field must be zeroed out) 895 */ 896 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 897 const struct in6_addr *saddr, 898 const struct in6_addr *daddr, int len) 899 { 900 unsigned int offset; 901 struct udphdr *uh = udp_hdr(skb); 902 struct sk_buff *frags = skb_shinfo(skb)->frag_list; 903 __wsum csum = 0; 904 905 if (!frags) { 906 /* Only one fragment on the socket. */ 907 skb->csum_start = skb_transport_header(skb) - skb->head; 908 skb->csum_offset = offsetof(struct udphdr, check); 909 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 910 } else { 911 /* 912 * HW-checksum won't work as there are two or more 913 * fragments on the socket so that all csums of sk_buffs 914 * should be together 915 */ 916 offset = skb_transport_offset(skb); 917 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 918 919 skb->ip_summed = CHECKSUM_NONE; 920 921 do { 922 csum = csum_add(csum, frags->csum); 923 } while ((frags = frags->next)); 924 925 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 926 csum); 927 if (uh->check == 0) 928 uh->check = CSUM_MANGLED_0; 929 } 930 } 931 932 /* 933 * Sending 934 */ 935 936 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) 937 { 938 struct sock *sk = skb->sk; 939 struct udphdr *uh; 940 int err = 0; 941 int is_udplite = IS_UDPLITE(sk); 942 __wsum csum = 0; 943 int offset = skb_transport_offset(skb); 944 int len = skb->len - offset; 945 946 /* 947 * Create a UDP header 948 */ 949 uh = udp_hdr(skb); 950 uh->source = fl6->fl6_sport; 951 uh->dest = fl6->fl6_dport; 952 uh->len = htons(len); 953 uh->check = 0; 954 955 if (is_udplite) 956 csum = udplite_csum(skb); 957 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 958 skb->ip_summed = CHECKSUM_NONE; 959 goto send; 960 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 961 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 962 goto send; 963 } else 964 csum = udp_csum(skb); 965 966 /* add protocol-dependent pseudo-header */ 967 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 968 len, fl6->flowi6_proto, csum); 969 if (uh->check == 0) 970 uh->check = CSUM_MANGLED_0; 971 972 send: 973 err = ip6_send_skb(skb); 974 if (err) { 975 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 976 UDP6_INC_STATS(sock_net(sk), 977 UDP_MIB_SNDBUFERRORS, is_udplite); 978 err = 0; 979 } 980 } else { 981 UDP6_INC_STATS(sock_net(sk), 982 UDP_MIB_OUTDATAGRAMS, is_udplite); 983 } 984 return err; 985 } 986 987 static int udp_v6_push_pending_frames(struct sock *sk) 988 { 989 struct sk_buff *skb; 990 struct udp_sock *up = udp_sk(sk); 991 struct flowi6 fl6; 992 int err = 0; 993 994 if (up->pending == AF_INET) 995 return udp_push_pending_frames(sk); 996 997 /* ip6_finish_skb will release the cork, so make a copy of 998 * fl6 here. 999 */ 1000 fl6 = inet_sk(sk)->cork.fl.u.ip6; 1001 1002 skb = ip6_finish_skb(sk); 1003 if (!skb) 1004 goto out; 1005 1006 err = udp_v6_send_skb(skb, &fl6); 1007 1008 out: 1009 up->len = 0; 1010 up->pending = 0; 1011 return err; 1012 } 1013 1014 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1015 { 1016 struct ipv6_txoptions opt_space; 1017 struct udp_sock *up = udp_sk(sk); 1018 struct inet_sock *inet = inet_sk(sk); 1019 struct ipv6_pinfo *np = inet6_sk(sk); 1020 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 1021 struct in6_addr *daddr, *final_p, final; 1022 struct ipv6_txoptions *opt = NULL; 1023 struct ipv6_txoptions *opt_to_free = NULL; 1024 struct ip6_flowlabel *flowlabel = NULL; 1025 struct flowi6 fl6; 1026 struct dst_entry *dst; 1027 struct ipcm6_cookie ipc6; 1028 int addr_len = msg->msg_namelen; 1029 int ulen = len; 1030 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1031 int err; 1032 int connected = 0; 1033 int is_udplite = IS_UDPLITE(sk); 1034 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1035 struct sockcm_cookie sockc; 1036 1037 ipc6.hlimit = -1; 1038 ipc6.tclass = -1; 1039 ipc6.dontfrag = -1; 1040 1041 /* destination address check */ 1042 if (sin6) { 1043 if (addr_len < offsetof(struct sockaddr, sa_data)) 1044 return -EINVAL; 1045 1046 switch (sin6->sin6_family) { 1047 case AF_INET6: 1048 if (addr_len < SIN6_LEN_RFC2133) 1049 return -EINVAL; 1050 daddr = &sin6->sin6_addr; 1051 break; 1052 case AF_INET: 1053 goto do_udp_sendmsg; 1054 case AF_UNSPEC: 1055 msg->msg_name = sin6 = NULL; 1056 msg->msg_namelen = addr_len = 0; 1057 daddr = NULL; 1058 break; 1059 default: 1060 return -EINVAL; 1061 } 1062 } else if (!up->pending) { 1063 if (sk->sk_state != TCP_ESTABLISHED) 1064 return -EDESTADDRREQ; 1065 daddr = &sk->sk_v6_daddr; 1066 } else 1067 daddr = NULL; 1068 1069 if (daddr) { 1070 if (ipv6_addr_v4mapped(daddr)) { 1071 struct sockaddr_in sin; 1072 sin.sin_family = AF_INET; 1073 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1074 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1075 msg->msg_name = &sin; 1076 msg->msg_namelen = sizeof(sin); 1077 do_udp_sendmsg: 1078 if (__ipv6_only_sock(sk)) 1079 return -ENETUNREACH; 1080 return udp_sendmsg(sk, msg, len); 1081 } 1082 } 1083 1084 if (up->pending == AF_INET) 1085 return udp_sendmsg(sk, msg, len); 1086 1087 /* Rough check on arithmetic overflow, 1088 better check is made in ip6_append_data(). 1089 */ 1090 if (len > INT_MAX - sizeof(struct udphdr)) 1091 return -EMSGSIZE; 1092 1093 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1094 if (up->pending) { 1095 /* 1096 * There are pending frames. 1097 * The socket lock must be held while it's corked. 1098 */ 1099 lock_sock(sk); 1100 if (likely(up->pending)) { 1101 if (unlikely(up->pending != AF_INET6)) { 1102 release_sock(sk); 1103 return -EAFNOSUPPORT; 1104 } 1105 dst = NULL; 1106 goto do_append_data; 1107 } 1108 release_sock(sk); 1109 } 1110 ulen += sizeof(struct udphdr); 1111 1112 memset(&fl6, 0, sizeof(fl6)); 1113 1114 if (sin6) { 1115 if (sin6->sin6_port == 0) 1116 return -EINVAL; 1117 1118 fl6.fl6_dport = sin6->sin6_port; 1119 daddr = &sin6->sin6_addr; 1120 1121 if (np->sndflow) { 1122 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1123 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1124 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1125 if (!flowlabel) 1126 return -EINVAL; 1127 } 1128 } 1129 1130 /* 1131 * Otherwise it will be difficult to maintain 1132 * sk->sk_dst_cache. 1133 */ 1134 if (sk->sk_state == TCP_ESTABLISHED && 1135 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1136 daddr = &sk->sk_v6_daddr; 1137 1138 if (addr_len >= sizeof(struct sockaddr_in6) && 1139 sin6->sin6_scope_id && 1140 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1141 fl6.flowi6_oif = sin6->sin6_scope_id; 1142 } else { 1143 if (sk->sk_state != TCP_ESTABLISHED) 1144 return -EDESTADDRREQ; 1145 1146 fl6.fl6_dport = inet->inet_dport; 1147 daddr = &sk->sk_v6_daddr; 1148 fl6.flowlabel = np->flow_label; 1149 connected = 1; 1150 } 1151 1152 if (!fl6.flowi6_oif) 1153 fl6.flowi6_oif = sk->sk_bound_dev_if; 1154 1155 if (!fl6.flowi6_oif) 1156 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1157 1158 fl6.flowi6_mark = sk->sk_mark; 1159 sockc.tsflags = sk->sk_tsflags; 1160 1161 if (msg->msg_controllen) { 1162 opt = &opt_space; 1163 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1164 opt->tot_len = sizeof(*opt); 1165 ipc6.opt = opt; 1166 1167 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); 1168 if (err < 0) { 1169 fl6_sock_release(flowlabel); 1170 return err; 1171 } 1172 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1173 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1174 if (!flowlabel) 1175 return -EINVAL; 1176 } 1177 if (!(opt->opt_nflen|opt->opt_flen)) 1178 opt = NULL; 1179 connected = 0; 1180 } 1181 if (!opt) { 1182 opt = txopt_get(np); 1183 opt_to_free = opt; 1184 } 1185 if (flowlabel) 1186 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1187 opt = ipv6_fixup_options(&opt_space, opt); 1188 ipc6.opt = opt; 1189 1190 fl6.flowi6_proto = sk->sk_protocol; 1191 if (!ipv6_addr_any(daddr)) 1192 fl6.daddr = *daddr; 1193 else 1194 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1195 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1196 fl6.saddr = np->saddr; 1197 fl6.fl6_sport = inet->inet_sport; 1198 1199 final_p = fl6_update_dst(&fl6, opt, &final); 1200 if (final_p) 1201 connected = 0; 1202 1203 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1204 fl6.flowi6_oif = np->mcast_oif; 1205 connected = 0; 1206 } else if (!fl6.flowi6_oif) 1207 fl6.flowi6_oif = np->ucast_oif; 1208 1209 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1210 1211 if (ipc6.tclass < 0) 1212 ipc6.tclass = np->tclass; 1213 1214 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 1215 1216 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 1217 if (IS_ERR(dst)) { 1218 err = PTR_ERR(dst); 1219 dst = NULL; 1220 goto out; 1221 } 1222 1223 if (ipc6.hlimit < 0) 1224 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1225 1226 if (msg->msg_flags&MSG_CONFIRM) 1227 goto do_confirm; 1228 back_from_confirm: 1229 1230 /* Lockless fast path for the non-corking case */ 1231 if (!corkreq) { 1232 struct sk_buff *skb; 1233 1234 skb = ip6_make_skb(sk, getfrag, msg, ulen, 1235 sizeof(struct udphdr), &ipc6, 1236 &fl6, (struct rt6_info *)dst, 1237 msg->msg_flags, &sockc); 1238 err = PTR_ERR(skb); 1239 if (!IS_ERR_OR_NULL(skb)) 1240 err = udp_v6_send_skb(skb, &fl6); 1241 goto release_dst; 1242 } 1243 1244 lock_sock(sk); 1245 if (unlikely(up->pending)) { 1246 /* The socket is already corked while preparing it. */ 1247 /* ... which is an evident application bug. --ANK */ 1248 release_sock(sk); 1249 1250 net_dbg_ratelimited("udp cork app bug 2\n"); 1251 err = -EINVAL; 1252 goto out; 1253 } 1254 1255 up->pending = AF_INET6; 1256 1257 do_append_data: 1258 if (ipc6.dontfrag < 0) 1259 ipc6.dontfrag = np->dontfrag; 1260 up->len += ulen; 1261 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 1262 &ipc6, &fl6, (struct rt6_info *)dst, 1263 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); 1264 if (err) 1265 udp_v6_flush_pending_frames(sk); 1266 else if (!corkreq) 1267 err = udp_v6_push_pending_frames(sk); 1268 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1269 up->pending = 0; 1270 1271 if (err > 0) 1272 err = np->recverr ? net_xmit_errno(err) : 0; 1273 release_sock(sk); 1274 1275 release_dst: 1276 if (dst) { 1277 if (connected) { 1278 ip6_dst_store(sk, dst, 1279 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1280 &sk->sk_v6_daddr : NULL, 1281 #ifdef CONFIG_IPV6_SUBTREES 1282 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1283 &np->saddr : 1284 #endif 1285 NULL); 1286 } else { 1287 dst_release(dst); 1288 } 1289 dst = NULL; 1290 } 1291 1292 out: 1293 dst_release(dst); 1294 fl6_sock_release(flowlabel); 1295 txopt_put(opt_to_free); 1296 if (!err) 1297 return len; 1298 /* 1299 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1300 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1301 * we don't have a good statistic (IpOutDiscards but it can be too many 1302 * things). We could add another new stat but at least for now that 1303 * seems like overkill. 1304 */ 1305 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1306 UDP6_INC_STATS(sock_net(sk), 1307 UDP_MIB_SNDBUFERRORS, is_udplite); 1308 } 1309 return err; 1310 1311 do_confirm: 1312 dst_confirm(dst); 1313 if (!(msg->msg_flags&MSG_PROBE) || len) 1314 goto back_from_confirm; 1315 err = 0; 1316 goto out; 1317 } 1318 1319 void udpv6_destroy_sock(struct sock *sk) 1320 { 1321 struct udp_sock *up = udp_sk(sk); 1322 lock_sock(sk); 1323 udp_v6_flush_pending_frames(sk); 1324 release_sock(sk); 1325 1326 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1327 void (*encap_destroy)(struct sock *sk); 1328 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1329 if (encap_destroy) 1330 encap_destroy(sk); 1331 } 1332 1333 inet6_destroy_sock(sk); 1334 } 1335 1336 /* 1337 * Socket option code for UDP 1338 */ 1339 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1340 char __user *optval, unsigned int optlen) 1341 { 1342 if (level == SOL_UDP || level == SOL_UDPLITE) 1343 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1344 udp_v6_push_pending_frames); 1345 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1346 } 1347 1348 #ifdef CONFIG_COMPAT 1349 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1350 char __user *optval, unsigned int optlen) 1351 { 1352 if (level == SOL_UDP || level == SOL_UDPLITE) 1353 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1354 udp_v6_push_pending_frames); 1355 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1356 } 1357 #endif 1358 1359 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1360 char __user *optval, int __user *optlen) 1361 { 1362 if (level == SOL_UDP || level == SOL_UDPLITE) 1363 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1364 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1365 } 1366 1367 #ifdef CONFIG_COMPAT 1368 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1369 char __user *optval, int __user *optlen) 1370 { 1371 if (level == SOL_UDP || level == SOL_UDPLITE) 1372 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1373 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1374 } 1375 #endif 1376 1377 static const struct inet6_protocol udpv6_protocol = { 1378 .handler = udpv6_rcv, 1379 .err_handler = udpv6_err, 1380 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1381 }; 1382 1383 /* ------------------------------------------------------------------------ */ 1384 #ifdef CONFIG_PROC_FS 1385 int udp6_seq_show(struct seq_file *seq, void *v) 1386 { 1387 if (v == SEQ_START_TOKEN) { 1388 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1389 } else { 1390 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1391 struct inet_sock *inet = inet_sk(v); 1392 __u16 srcp = ntohs(inet->inet_sport); 1393 __u16 destp = ntohs(inet->inet_dport); 1394 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 1395 } 1396 return 0; 1397 } 1398 1399 static const struct file_operations udp6_afinfo_seq_fops = { 1400 .owner = THIS_MODULE, 1401 .open = udp_seq_open, 1402 .read = seq_read, 1403 .llseek = seq_lseek, 1404 .release = seq_release_net 1405 }; 1406 1407 static struct udp_seq_afinfo udp6_seq_afinfo = { 1408 .name = "udp6", 1409 .family = AF_INET6, 1410 .udp_table = &udp_table, 1411 .seq_fops = &udp6_afinfo_seq_fops, 1412 .seq_ops = { 1413 .show = udp6_seq_show, 1414 }, 1415 }; 1416 1417 int __net_init udp6_proc_init(struct net *net) 1418 { 1419 return udp_proc_register(net, &udp6_seq_afinfo); 1420 } 1421 1422 void udp6_proc_exit(struct net *net) 1423 { 1424 udp_proc_unregister(net, &udp6_seq_afinfo); 1425 } 1426 #endif /* CONFIG_PROC_FS */ 1427 1428 /* ------------------------------------------------------------------------ */ 1429 1430 struct proto udpv6_prot = { 1431 .name = "UDPv6", 1432 .owner = THIS_MODULE, 1433 .close = udp_lib_close, 1434 .connect = ip6_datagram_connect, 1435 .disconnect = udp_disconnect, 1436 .ioctl = udp_ioctl, 1437 .destroy = udpv6_destroy_sock, 1438 .setsockopt = udpv6_setsockopt, 1439 .getsockopt = udpv6_getsockopt, 1440 .sendmsg = udpv6_sendmsg, 1441 .recvmsg = udpv6_recvmsg, 1442 .backlog_rcv = __udpv6_queue_rcv_skb, 1443 .release_cb = ip6_datagram_release_cb, 1444 .hash = udp_lib_hash, 1445 .unhash = udp_lib_unhash, 1446 .rehash = udp_v6_rehash, 1447 .get_port = udp_v6_get_port, 1448 .memory_allocated = &udp_memory_allocated, 1449 .sysctl_mem = sysctl_udp_mem, 1450 .sysctl_wmem = &sysctl_udp_wmem_min, 1451 .sysctl_rmem = &sysctl_udp_rmem_min, 1452 .obj_size = sizeof(struct udp6_sock), 1453 .h.udp_table = &udp_table, 1454 #ifdef CONFIG_COMPAT 1455 .compat_setsockopt = compat_udpv6_setsockopt, 1456 .compat_getsockopt = compat_udpv6_getsockopt, 1457 #endif 1458 .diag_destroy = udp_abort, 1459 }; 1460 1461 static struct inet_protosw udpv6_protosw = { 1462 .type = SOCK_DGRAM, 1463 .protocol = IPPROTO_UDP, 1464 .prot = &udpv6_prot, 1465 .ops = &inet6_dgram_ops, 1466 .flags = INET_PROTOSW_PERMANENT, 1467 }; 1468 1469 int __init udpv6_init(void) 1470 { 1471 int ret; 1472 1473 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1474 if (ret) 1475 goto out; 1476 1477 ret = inet6_register_protosw(&udpv6_protosw); 1478 if (ret) 1479 goto out_udpv6_protocol; 1480 out: 1481 return ret; 1482 1483 out_udpv6_protocol: 1484 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1485 goto out; 1486 } 1487 1488 void udpv6_exit(void) 1489 { 1490 inet6_unregister_protosw(&udpv6_protosw); 1491 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1492 } 1493