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(msg, skb); 431 } else { 432 if (np->rxopt.all) 433 ip6_datagram_recv_specific_ctl(sk, msg, skb); 434 } 435 436 err = copied; 437 if (flags & MSG_TRUNC) 438 err = ulen; 439 440 __skb_free_datagram_locked(sk, skb, peeking ? -err : err); 441 return err; 442 443 csum_copy_err: 444 slow = lock_sock_fast(sk); 445 if (!skb_kill_datagram(sk, skb, flags)) { 446 if (is_udp4) { 447 UDP_INC_STATS(sock_net(sk), 448 UDP_MIB_CSUMERRORS, is_udplite); 449 UDP_INC_STATS(sock_net(sk), 450 UDP_MIB_INERRORS, is_udplite); 451 } else { 452 UDP6_INC_STATS(sock_net(sk), 453 UDP_MIB_CSUMERRORS, is_udplite); 454 UDP6_INC_STATS(sock_net(sk), 455 UDP_MIB_INERRORS, is_udplite); 456 } 457 } 458 unlock_sock_fast(sk, slow); 459 460 /* starting over for a new packet, but check if we need to yield */ 461 cond_resched(); 462 msg->msg_flags &= ~MSG_TRUNC; 463 goto try_again; 464 } 465 466 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 467 u8 type, u8 code, int offset, __be32 info, 468 struct udp_table *udptable) 469 { 470 struct ipv6_pinfo *np; 471 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 472 const struct in6_addr *saddr = &hdr->saddr; 473 const struct in6_addr *daddr = &hdr->daddr; 474 struct udphdr *uh = (struct udphdr *)(skb->data+offset); 475 struct sock *sk; 476 int harderr; 477 int err; 478 struct net *net = dev_net(skb->dev); 479 480 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 481 inet6_iif(skb), udptable, skb); 482 if (!sk) { 483 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 484 ICMP6_MIB_INERRORS); 485 return; 486 } 487 488 harderr = icmpv6_err_convert(type, code, &err); 489 np = inet6_sk(sk); 490 491 if (type == ICMPV6_PKT_TOOBIG) { 492 if (!ip6_sk_accept_pmtu(sk)) 493 goto out; 494 ip6_sk_update_pmtu(skb, sk, info); 495 if (np->pmtudisc != IPV6_PMTUDISC_DONT) 496 harderr = 1; 497 } 498 if (type == NDISC_REDIRECT) { 499 ip6_sk_redirect(skb, sk); 500 goto out; 501 } 502 503 if (!np->recverr) { 504 if (!harderr || sk->sk_state != TCP_ESTABLISHED) 505 goto out; 506 } else { 507 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 508 } 509 510 sk->sk_err = err; 511 sk->sk_error_report(sk); 512 out: 513 return; 514 } 515 516 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 517 { 518 int rc; 519 520 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 521 sock_rps_save_rxhash(sk, skb); 522 sk_mark_napi_id(sk, skb); 523 sk_incoming_cpu_update(sk); 524 } 525 526 rc = __sock_queue_rcv_skb(sk, skb); 527 if (rc < 0) { 528 int is_udplite = IS_UDPLITE(sk); 529 530 /* Note that an ENOMEM error is charged twice */ 531 if (rc == -ENOMEM) 532 UDP6_INC_STATS(sock_net(sk), 533 UDP_MIB_RCVBUFERRORS, is_udplite); 534 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 535 kfree_skb(skb); 536 return -1; 537 } 538 return 0; 539 } 540 541 static __inline__ void udpv6_err(struct sk_buff *skb, 542 struct inet6_skb_parm *opt, u8 type, 543 u8 code, int offset, __be32 info) 544 { 545 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 546 } 547 548 static struct static_key udpv6_encap_needed __read_mostly; 549 void udpv6_encap_enable(void) 550 { 551 if (!static_key_enabled(&udpv6_encap_needed)) 552 static_key_slow_inc(&udpv6_encap_needed); 553 } 554 EXPORT_SYMBOL(udpv6_encap_enable); 555 556 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 557 { 558 struct udp_sock *up = udp_sk(sk); 559 int rc; 560 int is_udplite = IS_UDPLITE(sk); 561 562 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 563 goto drop; 564 565 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 566 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 567 568 /* 569 * This is an encapsulation socket so pass the skb to 570 * the socket's udp_encap_rcv() hook. Otherwise, just 571 * fall through and pass this up the UDP socket. 572 * up->encap_rcv() returns the following value: 573 * =0 if skb was successfully passed to the encap 574 * handler or was discarded by it. 575 * >0 if skb should be passed on to UDP. 576 * <0 if skb should be resubmitted as proto -N 577 */ 578 579 /* if we're overly short, let UDP handle it */ 580 encap_rcv = ACCESS_ONCE(up->encap_rcv); 581 if (encap_rcv) { 582 int ret; 583 584 /* Verify checksum before giving to encap */ 585 if (udp_lib_checksum_complete(skb)) 586 goto csum_error; 587 588 ret = encap_rcv(sk, skb); 589 if (ret <= 0) { 590 __UDP_INC_STATS(sock_net(sk), 591 UDP_MIB_INDATAGRAMS, 592 is_udplite); 593 return -ret; 594 } 595 } 596 597 /* FALLTHROUGH -- it's a UDP Packet */ 598 } 599 600 /* 601 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 602 */ 603 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 604 605 if (up->pcrlen == 0) { /* full coverage was set */ 606 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 607 UDP_SKB_CB(skb)->cscov, skb->len); 608 goto drop; 609 } 610 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 611 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 612 UDP_SKB_CB(skb)->cscov, up->pcrlen); 613 goto drop; 614 } 615 } 616 617 if (rcu_access_pointer(sk->sk_filter) && 618 udp_lib_checksum_complete(skb)) 619 goto csum_error; 620 621 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 622 goto drop; 623 624 udp_csum_pull_header(skb); 625 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { 626 __UDP6_INC_STATS(sock_net(sk), 627 UDP_MIB_RCVBUFERRORS, is_udplite); 628 goto drop; 629 } 630 631 skb_dst_drop(skb); 632 633 bh_lock_sock(sk); 634 rc = 0; 635 if (!sock_owned_by_user(sk)) 636 rc = __udpv6_queue_rcv_skb(sk, skb); 637 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 638 bh_unlock_sock(sk); 639 goto drop; 640 } 641 bh_unlock_sock(sk); 642 643 return rc; 644 645 csum_error: 646 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 647 drop: 648 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 649 atomic_inc(&sk->sk_drops); 650 kfree_skb(skb); 651 return -1; 652 } 653 654 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 655 __be16 loc_port, const struct in6_addr *loc_addr, 656 __be16 rmt_port, const struct in6_addr *rmt_addr, 657 int dif, unsigned short hnum) 658 { 659 struct inet_sock *inet = inet_sk(sk); 660 661 if (!net_eq(sock_net(sk), net)) 662 return false; 663 664 if (udp_sk(sk)->udp_port_hash != hnum || 665 sk->sk_family != PF_INET6 || 666 (inet->inet_dport && inet->inet_dport != rmt_port) || 667 (!ipv6_addr_any(&sk->sk_v6_daddr) && 668 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 669 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || 670 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 671 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 672 return false; 673 if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 674 return false; 675 return true; 676 } 677 678 static void udp6_csum_zero_error(struct sk_buff *skb) 679 { 680 /* RFC 2460 section 8.1 says that we SHOULD log 681 * this error. Well, it is reasonable. 682 */ 683 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 684 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 685 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 686 } 687 688 /* 689 * Note: called only from the BH handler context, 690 * so we don't need to lock the hashes. 691 */ 692 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 693 const struct in6_addr *saddr, const struct in6_addr *daddr, 694 struct udp_table *udptable, int proto) 695 { 696 struct sock *sk, *first = NULL; 697 const struct udphdr *uh = udp_hdr(skb); 698 unsigned short hnum = ntohs(uh->dest); 699 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 700 unsigned int offset = offsetof(typeof(*sk), sk_node); 701 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 702 int dif = inet6_iif(skb); 703 struct hlist_node *node; 704 struct sk_buff *nskb; 705 706 if (use_hash2) { 707 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & 708 udp_table.mask; 709 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; 710 start_lookup: 711 hslot = &udp_table.hash2[hash2]; 712 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 713 } 714 715 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 716 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 717 uh->source, saddr, dif, hnum)) 718 continue; 719 /* If zero checksum and no_check is not on for 720 * the socket then skip it. 721 */ 722 if (!uh->check && !udp_sk(sk)->no_check6_rx) 723 continue; 724 if (!first) { 725 first = sk; 726 continue; 727 } 728 nskb = skb_clone(skb, GFP_ATOMIC); 729 if (unlikely(!nskb)) { 730 atomic_inc(&sk->sk_drops); 731 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 732 IS_UDPLITE(sk)); 733 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 734 IS_UDPLITE(sk)); 735 continue; 736 } 737 738 if (udpv6_queue_rcv_skb(sk, nskb) > 0) 739 consume_skb(nskb); 740 } 741 742 /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 743 if (use_hash2 && hash2 != hash2_any) { 744 hash2 = hash2_any; 745 goto start_lookup; 746 } 747 748 if (first) { 749 if (udpv6_queue_rcv_skb(first, skb) > 0) 750 consume_skb(skb); 751 } else { 752 kfree_skb(skb); 753 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 754 proto == IPPROTO_UDPLITE); 755 } 756 return 0; 757 } 758 759 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 760 int proto) 761 { 762 const struct in6_addr *saddr, *daddr; 763 struct net *net = dev_net(skb->dev); 764 struct udphdr *uh; 765 struct sock *sk; 766 u32 ulen = 0; 767 768 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 769 goto discard; 770 771 saddr = &ipv6_hdr(skb)->saddr; 772 daddr = &ipv6_hdr(skb)->daddr; 773 uh = udp_hdr(skb); 774 775 ulen = ntohs(uh->len); 776 if (ulen > skb->len) 777 goto short_packet; 778 779 if (proto == IPPROTO_UDP) { 780 /* UDP validates ulen. */ 781 782 /* Check for jumbo payload */ 783 if (ulen == 0) 784 ulen = skb->len; 785 786 if (ulen < sizeof(*uh)) 787 goto short_packet; 788 789 if (ulen < skb->len) { 790 if (pskb_trim_rcsum(skb, ulen)) 791 goto short_packet; 792 saddr = &ipv6_hdr(skb)->saddr; 793 daddr = &ipv6_hdr(skb)->daddr; 794 uh = udp_hdr(skb); 795 } 796 } 797 798 if (udp6_csum_init(skb, uh, proto)) 799 goto csum_error; 800 801 /* 802 * Multicast receive code 803 */ 804 if (ipv6_addr_is_multicast(daddr)) 805 return __udp6_lib_mcast_deliver(net, skb, 806 saddr, daddr, udptable, proto); 807 808 /* Unicast */ 809 810 /* 811 * check socket cache ... must talk to Alan about his plans 812 * for sock caches... i'll skip this for now. 813 */ 814 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 815 if (sk) { 816 int ret; 817 818 if (!uh->check && !udp_sk(sk)->no_check6_rx) { 819 udp6_csum_zero_error(skb); 820 goto csum_error; 821 } 822 823 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 824 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 825 ip6_compute_pseudo); 826 827 ret = udpv6_queue_rcv_skb(sk, skb); 828 829 /* a return value > 0 means to resubmit the input */ 830 if (ret > 0) 831 return ret; 832 833 return 0; 834 } 835 836 if (!uh->check) { 837 udp6_csum_zero_error(skb); 838 goto csum_error; 839 } 840 841 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 842 goto discard; 843 844 if (udp_lib_checksum_complete(skb)) 845 goto csum_error; 846 847 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 848 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 849 850 kfree_skb(skb); 851 return 0; 852 853 short_packet: 854 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 855 proto == IPPROTO_UDPLITE ? "-Lite" : "", 856 saddr, ntohs(uh->source), 857 ulen, skb->len, 858 daddr, ntohs(uh->dest)); 859 goto discard; 860 csum_error: 861 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 862 discard: 863 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 864 kfree_skb(skb); 865 return 0; 866 } 867 868 static __inline__ int udpv6_rcv(struct sk_buff *skb) 869 { 870 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 871 } 872 873 /* 874 * Throw away all pending data and cancel the corking. Socket is locked. 875 */ 876 static void udp_v6_flush_pending_frames(struct sock *sk) 877 { 878 struct udp_sock *up = udp_sk(sk); 879 880 if (up->pending == AF_INET) 881 udp_flush_pending_frames(sk); 882 else if (up->pending) { 883 up->len = 0; 884 up->pending = 0; 885 ip6_flush_pending_frames(sk); 886 } 887 } 888 889 /** 890 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 891 * @sk: socket we are sending on 892 * @skb: sk_buff containing the filled-in UDP header 893 * (checksum field must be zeroed out) 894 */ 895 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 896 const struct in6_addr *saddr, 897 const struct in6_addr *daddr, int len) 898 { 899 unsigned int offset; 900 struct udphdr *uh = udp_hdr(skb); 901 struct sk_buff *frags = skb_shinfo(skb)->frag_list; 902 __wsum csum = 0; 903 904 if (!frags) { 905 /* Only one fragment on the socket. */ 906 skb->csum_start = skb_transport_header(skb) - skb->head; 907 skb->csum_offset = offsetof(struct udphdr, check); 908 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 909 } else { 910 /* 911 * HW-checksum won't work as there are two or more 912 * fragments on the socket so that all csums of sk_buffs 913 * should be together 914 */ 915 offset = skb_transport_offset(skb); 916 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 917 918 skb->ip_summed = CHECKSUM_NONE; 919 920 do { 921 csum = csum_add(csum, frags->csum); 922 } while ((frags = frags->next)); 923 924 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 925 csum); 926 if (uh->check == 0) 927 uh->check = CSUM_MANGLED_0; 928 } 929 } 930 931 /* 932 * Sending 933 */ 934 935 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) 936 { 937 struct sock *sk = skb->sk; 938 struct udphdr *uh; 939 int err = 0; 940 int is_udplite = IS_UDPLITE(sk); 941 __wsum csum = 0; 942 int offset = skb_transport_offset(skb); 943 int len = skb->len - offset; 944 945 /* 946 * Create a UDP header 947 */ 948 uh = udp_hdr(skb); 949 uh->source = fl6->fl6_sport; 950 uh->dest = fl6->fl6_dport; 951 uh->len = htons(len); 952 uh->check = 0; 953 954 if (is_udplite) 955 csum = udplite_csum(skb); 956 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 957 skb->ip_summed = CHECKSUM_NONE; 958 goto send; 959 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 960 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 961 goto send; 962 } else 963 csum = udp_csum(skb); 964 965 /* add protocol-dependent pseudo-header */ 966 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 967 len, fl6->flowi6_proto, csum); 968 if (uh->check == 0) 969 uh->check = CSUM_MANGLED_0; 970 971 send: 972 err = ip6_send_skb(skb); 973 if (err) { 974 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 975 UDP6_INC_STATS(sock_net(sk), 976 UDP_MIB_SNDBUFERRORS, is_udplite); 977 err = 0; 978 } 979 } else { 980 UDP6_INC_STATS(sock_net(sk), 981 UDP_MIB_OUTDATAGRAMS, is_udplite); 982 } 983 return err; 984 } 985 986 static int udp_v6_push_pending_frames(struct sock *sk) 987 { 988 struct sk_buff *skb; 989 struct udp_sock *up = udp_sk(sk); 990 struct flowi6 fl6; 991 int err = 0; 992 993 if (up->pending == AF_INET) 994 return udp_push_pending_frames(sk); 995 996 /* ip6_finish_skb will release the cork, so make a copy of 997 * fl6 here. 998 */ 999 fl6 = inet_sk(sk)->cork.fl.u.ip6; 1000 1001 skb = ip6_finish_skb(sk); 1002 if (!skb) 1003 goto out; 1004 1005 err = udp_v6_send_skb(skb, &fl6); 1006 1007 out: 1008 up->len = 0; 1009 up->pending = 0; 1010 return err; 1011 } 1012 1013 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1014 { 1015 struct ipv6_txoptions opt_space; 1016 struct udp_sock *up = udp_sk(sk); 1017 struct inet_sock *inet = inet_sk(sk); 1018 struct ipv6_pinfo *np = inet6_sk(sk); 1019 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 1020 struct in6_addr *daddr, *final_p, final; 1021 struct ipv6_txoptions *opt = NULL; 1022 struct ipv6_txoptions *opt_to_free = NULL; 1023 struct ip6_flowlabel *flowlabel = NULL; 1024 struct flowi6 fl6; 1025 struct dst_entry *dst; 1026 struct ipcm6_cookie ipc6; 1027 int addr_len = msg->msg_namelen; 1028 int ulen = len; 1029 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1030 int err; 1031 int connected = 0; 1032 int is_udplite = IS_UDPLITE(sk); 1033 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1034 struct sockcm_cookie sockc; 1035 1036 ipc6.hlimit = -1; 1037 ipc6.tclass = -1; 1038 ipc6.dontfrag = -1; 1039 1040 /* destination address check */ 1041 if (sin6) { 1042 if (addr_len < offsetof(struct sockaddr, sa_data)) 1043 return -EINVAL; 1044 1045 switch (sin6->sin6_family) { 1046 case AF_INET6: 1047 if (addr_len < SIN6_LEN_RFC2133) 1048 return -EINVAL; 1049 daddr = &sin6->sin6_addr; 1050 break; 1051 case AF_INET: 1052 goto do_udp_sendmsg; 1053 case AF_UNSPEC: 1054 msg->msg_name = sin6 = NULL; 1055 msg->msg_namelen = addr_len = 0; 1056 daddr = NULL; 1057 break; 1058 default: 1059 return -EINVAL; 1060 } 1061 } else if (!up->pending) { 1062 if (sk->sk_state != TCP_ESTABLISHED) 1063 return -EDESTADDRREQ; 1064 daddr = &sk->sk_v6_daddr; 1065 } else 1066 daddr = NULL; 1067 1068 if (daddr) { 1069 if (ipv6_addr_v4mapped(daddr)) { 1070 struct sockaddr_in sin; 1071 sin.sin_family = AF_INET; 1072 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1073 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1074 msg->msg_name = &sin; 1075 msg->msg_namelen = sizeof(sin); 1076 do_udp_sendmsg: 1077 if (__ipv6_only_sock(sk)) 1078 return -ENETUNREACH; 1079 return udp_sendmsg(sk, msg, len); 1080 } 1081 } 1082 1083 if (up->pending == AF_INET) 1084 return udp_sendmsg(sk, msg, len); 1085 1086 /* Rough check on arithmetic overflow, 1087 better check is made in ip6_append_data(). 1088 */ 1089 if (len > INT_MAX - sizeof(struct udphdr)) 1090 return -EMSGSIZE; 1091 1092 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1093 if (up->pending) { 1094 /* 1095 * There are pending frames. 1096 * The socket lock must be held while it's corked. 1097 */ 1098 lock_sock(sk); 1099 if (likely(up->pending)) { 1100 if (unlikely(up->pending != AF_INET6)) { 1101 release_sock(sk); 1102 return -EAFNOSUPPORT; 1103 } 1104 dst = NULL; 1105 goto do_append_data; 1106 } 1107 release_sock(sk); 1108 } 1109 ulen += sizeof(struct udphdr); 1110 1111 memset(&fl6, 0, sizeof(fl6)); 1112 1113 if (sin6) { 1114 if (sin6->sin6_port == 0) 1115 return -EINVAL; 1116 1117 fl6.fl6_dport = sin6->sin6_port; 1118 daddr = &sin6->sin6_addr; 1119 1120 if (np->sndflow) { 1121 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1122 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1123 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1124 if (!flowlabel) 1125 return -EINVAL; 1126 } 1127 } 1128 1129 /* 1130 * Otherwise it will be difficult to maintain 1131 * sk->sk_dst_cache. 1132 */ 1133 if (sk->sk_state == TCP_ESTABLISHED && 1134 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1135 daddr = &sk->sk_v6_daddr; 1136 1137 if (addr_len >= sizeof(struct sockaddr_in6) && 1138 sin6->sin6_scope_id && 1139 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1140 fl6.flowi6_oif = sin6->sin6_scope_id; 1141 } else { 1142 if (sk->sk_state != TCP_ESTABLISHED) 1143 return -EDESTADDRREQ; 1144 1145 fl6.fl6_dport = inet->inet_dport; 1146 daddr = &sk->sk_v6_daddr; 1147 fl6.flowlabel = np->flow_label; 1148 connected = 1; 1149 } 1150 1151 if (!fl6.flowi6_oif) 1152 fl6.flowi6_oif = sk->sk_bound_dev_if; 1153 1154 if (!fl6.flowi6_oif) 1155 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1156 1157 fl6.flowi6_mark = sk->sk_mark; 1158 sockc.tsflags = sk->sk_tsflags; 1159 1160 if (msg->msg_controllen) { 1161 opt = &opt_space; 1162 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1163 opt->tot_len = sizeof(*opt); 1164 ipc6.opt = opt; 1165 1166 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); 1167 if (err < 0) { 1168 fl6_sock_release(flowlabel); 1169 return err; 1170 } 1171 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1172 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1173 if (!flowlabel) 1174 return -EINVAL; 1175 } 1176 if (!(opt->opt_nflen|opt->opt_flen)) 1177 opt = NULL; 1178 connected = 0; 1179 } 1180 if (!opt) { 1181 opt = txopt_get(np); 1182 opt_to_free = opt; 1183 } 1184 if (flowlabel) 1185 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1186 opt = ipv6_fixup_options(&opt_space, opt); 1187 ipc6.opt = opt; 1188 1189 fl6.flowi6_proto = sk->sk_protocol; 1190 if (!ipv6_addr_any(daddr)) 1191 fl6.daddr = *daddr; 1192 else 1193 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1194 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1195 fl6.saddr = np->saddr; 1196 fl6.fl6_sport = inet->inet_sport; 1197 1198 final_p = fl6_update_dst(&fl6, opt, &final); 1199 if (final_p) 1200 connected = 0; 1201 1202 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1203 fl6.flowi6_oif = np->mcast_oif; 1204 connected = 0; 1205 } else if (!fl6.flowi6_oif) 1206 fl6.flowi6_oif = np->ucast_oif; 1207 1208 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1209 1210 if (ipc6.tclass < 0) 1211 ipc6.tclass = np->tclass; 1212 1213 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 1214 1215 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 1216 if (IS_ERR(dst)) { 1217 err = PTR_ERR(dst); 1218 dst = NULL; 1219 goto out; 1220 } 1221 1222 if (ipc6.hlimit < 0) 1223 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1224 1225 if (msg->msg_flags&MSG_CONFIRM) 1226 goto do_confirm; 1227 back_from_confirm: 1228 1229 /* Lockless fast path for the non-corking case */ 1230 if (!corkreq) { 1231 struct sk_buff *skb; 1232 1233 skb = ip6_make_skb(sk, getfrag, msg, ulen, 1234 sizeof(struct udphdr), &ipc6, 1235 &fl6, (struct rt6_info *)dst, 1236 msg->msg_flags, &sockc); 1237 err = PTR_ERR(skb); 1238 if (!IS_ERR_OR_NULL(skb)) 1239 err = udp_v6_send_skb(skb, &fl6); 1240 goto release_dst; 1241 } 1242 1243 lock_sock(sk); 1244 if (unlikely(up->pending)) { 1245 /* The socket is already corked while preparing it. */ 1246 /* ... which is an evident application bug. --ANK */ 1247 release_sock(sk); 1248 1249 net_dbg_ratelimited("udp cork app bug 2\n"); 1250 err = -EINVAL; 1251 goto out; 1252 } 1253 1254 up->pending = AF_INET6; 1255 1256 do_append_data: 1257 if (ipc6.dontfrag < 0) 1258 ipc6.dontfrag = np->dontfrag; 1259 up->len += ulen; 1260 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 1261 &ipc6, &fl6, (struct rt6_info *)dst, 1262 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); 1263 if (err) 1264 udp_v6_flush_pending_frames(sk); 1265 else if (!corkreq) 1266 err = udp_v6_push_pending_frames(sk); 1267 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1268 up->pending = 0; 1269 1270 if (err > 0) 1271 err = np->recverr ? net_xmit_errno(err) : 0; 1272 release_sock(sk); 1273 1274 release_dst: 1275 if (dst) { 1276 if (connected) { 1277 ip6_dst_store(sk, dst, 1278 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1279 &sk->sk_v6_daddr : NULL, 1280 #ifdef CONFIG_IPV6_SUBTREES 1281 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1282 &np->saddr : 1283 #endif 1284 NULL); 1285 } else { 1286 dst_release(dst); 1287 } 1288 dst = NULL; 1289 } 1290 1291 out: 1292 dst_release(dst); 1293 fl6_sock_release(flowlabel); 1294 txopt_put(opt_to_free); 1295 if (!err) 1296 return len; 1297 /* 1298 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1299 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1300 * we don't have a good statistic (IpOutDiscards but it can be too many 1301 * things). We could add another new stat but at least for now that 1302 * seems like overkill. 1303 */ 1304 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1305 UDP6_INC_STATS(sock_net(sk), 1306 UDP_MIB_SNDBUFERRORS, is_udplite); 1307 } 1308 return err; 1309 1310 do_confirm: 1311 dst_confirm(dst); 1312 if (!(msg->msg_flags&MSG_PROBE) || len) 1313 goto back_from_confirm; 1314 err = 0; 1315 goto out; 1316 } 1317 1318 void udpv6_destroy_sock(struct sock *sk) 1319 { 1320 struct udp_sock *up = udp_sk(sk); 1321 lock_sock(sk); 1322 udp_v6_flush_pending_frames(sk); 1323 release_sock(sk); 1324 1325 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1326 void (*encap_destroy)(struct sock *sk); 1327 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1328 if (encap_destroy) 1329 encap_destroy(sk); 1330 } 1331 1332 inet6_destroy_sock(sk); 1333 } 1334 1335 /* 1336 * Socket option code for UDP 1337 */ 1338 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1339 char __user *optval, unsigned int optlen) 1340 { 1341 if (level == SOL_UDP || level == SOL_UDPLITE) 1342 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1343 udp_v6_push_pending_frames); 1344 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1345 } 1346 1347 #ifdef CONFIG_COMPAT 1348 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1349 char __user *optval, unsigned int optlen) 1350 { 1351 if (level == SOL_UDP || level == SOL_UDPLITE) 1352 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1353 udp_v6_push_pending_frames); 1354 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1355 } 1356 #endif 1357 1358 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1359 char __user *optval, int __user *optlen) 1360 { 1361 if (level == SOL_UDP || level == SOL_UDPLITE) 1362 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1363 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1364 } 1365 1366 #ifdef CONFIG_COMPAT 1367 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1368 char __user *optval, int __user *optlen) 1369 { 1370 if (level == SOL_UDP || level == SOL_UDPLITE) 1371 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1372 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1373 } 1374 #endif 1375 1376 static const struct inet6_protocol udpv6_protocol = { 1377 .handler = udpv6_rcv, 1378 .err_handler = udpv6_err, 1379 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1380 }; 1381 1382 /* ------------------------------------------------------------------------ */ 1383 #ifdef CONFIG_PROC_FS 1384 int udp6_seq_show(struct seq_file *seq, void *v) 1385 { 1386 if (v == SEQ_START_TOKEN) { 1387 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1388 } else { 1389 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1390 struct inet_sock *inet = inet_sk(v); 1391 __u16 srcp = ntohs(inet->inet_sport); 1392 __u16 destp = ntohs(inet->inet_dport); 1393 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 1394 } 1395 return 0; 1396 } 1397 1398 static const struct file_operations udp6_afinfo_seq_fops = { 1399 .owner = THIS_MODULE, 1400 .open = udp_seq_open, 1401 .read = seq_read, 1402 .llseek = seq_lseek, 1403 .release = seq_release_net 1404 }; 1405 1406 static struct udp_seq_afinfo udp6_seq_afinfo = { 1407 .name = "udp6", 1408 .family = AF_INET6, 1409 .udp_table = &udp_table, 1410 .seq_fops = &udp6_afinfo_seq_fops, 1411 .seq_ops = { 1412 .show = udp6_seq_show, 1413 }, 1414 }; 1415 1416 int __net_init udp6_proc_init(struct net *net) 1417 { 1418 return udp_proc_register(net, &udp6_seq_afinfo); 1419 } 1420 1421 void udp6_proc_exit(struct net *net) 1422 { 1423 udp_proc_unregister(net, &udp6_seq_afinfo); 1424 } 1425 #endif /* CONFIG_PROC_FS */ 1426 1427 void udp_v6_clear_sk(struct sock *sk, int size) 1428 { 1429 struct inet_sock *inet = inet_sk(sk); 1430 1431 /* we do not want to clear pinet6 field, because of RCU lookups */ 1432 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1433 1434 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1435 memset(&inet->pinet6 + 1, 0, size); 1436 } 1437 1438 /* ------------------------------------------------------------------------ */ 1439 1440 struct proto udpv6_prot = { 1441 .name = "UDPv6", 1442 .owner = THIS_MODULE, 1443 .close = udp_lib_close, 1444 .connect = ip6_datagram_connect, 1445 .disconnect = udp_disconnect, 1446 .ioctl = udp_ioctl, 1447 .destroy = udpv6_destroy_sock, 1448 .setsockopt = udpv6_setsockopt, 1449 .getsockopt = udpv6_getsockopt, 1450 .sendmsg = udpv6_sendmsg, 1451 .recvmsg = udpv6_recvmsg, 1452 .backlog_rcv = __udpv6_queue_rcv_skb, 1453 .release_cb = ip6_datagram_release_cb, 1454 .hash = udp_lib_hash, 1455 .unhash = udp_lib_unhash, 1456 .rehash = udp_v6_rehash, 1457 .get_port = udp_v6_get_port, 1458 .memory_allocated = &udp_memory_allocated, 1459 .sysctl_mem = sysctl_udp_mem, 1460 .sysctl_wmem = &sysctl_udp_wmem_min, 1461 .sysctl_rmem = &sysctl_udp_rmem_min, 1462 .obj_size = sizeof(struct udp6_sock), 1463 .slab_flags = SLAB_DESTROY_BY_RCU, 1464 .h.udp_table = &udp_table, 1465 #ifdef CONFIG_COMPAT 1466 .compat_setsockopt = compat_udpv6_setsockopt, 1467 .compat_getsockopt = compat_udpv6_getsockopt, 1468 #endif 1469 .clear_sk = udp_v6_clear_sk, 1470 }; 1471 1472 static struct inet_protosw udpv6_protosw = { 1473 .type = SOCK_DGRAM, 1474 .protocol = IPPROTO_UDP, 1475 .prot = &udpv6_prot, 1476 .ops = &inet6_dgram_ops, 1477 .flags = INET_PROTOSW_PERMANENT, 1478 }; 1479 1480 int __init udpv6_init(void) 1481 { 1482 int ret; 1483 1484 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1485 if (ret) 1486 goto out; 1487 1488 ret = inet6_register_protosw(&udpv6_protosw); 1489 if (ret) 1490 goto out_udpv6_protocol; 1491 out: 1492 return ret; 1493 1494 out_udpv6_protocol: 1495 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1496 goto out; 1497 } 1498 1499 void udpv6_exit(void) 1500 { 1501 inet6_unregister_protosw(&udpv6_protosw); 1502 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1503 } 1504