1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * UDP over IPv6 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Based on linux/ipv4/udp.c 10 * 11 * Fixes: 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 14 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 15 * a single port at the same time. 16 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 17 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 18 */ 19 20 #include <linux/bpf-cgroup.h> 21 #include <linux/errno.h> 22 #include <linux/types.h> 23 #include <linux/socket.h> 24 #include <linux/sockios.h> 25 #include <linux/net.h> 26 #include <linux/in6.h> 27 #include <linux/netdevice.h> 28 #include <linux/if_arp.h> 29 #include <linux/ipv6.h> 30 #include <linux/icmpv6.h> 31 #include <linux/init.h> 32 #include <linux/module.h> 33 #include <linux/skbuff.h> 34 #include <linux/slab.h> 35 #include <linux/uaccess.h> 36 #include <linux/indirect_call_wrapper.h> 37 #include <trace/events/udp.h> 38 39 #include <net/addrconf.h> 40 #include <net/ndisc.h> 41 #include <net/protocol.h> 42 #include <net/transp_v6.h> 43 #include <net/ip6_route.h> 44 #include <net/raw.h> 45 #include <net/seg6.h> 46 #include <net/tcp_states.h> 47 #include <net/ip6_checksum.h> 48 #include <net/ip6_tunnel.h> 49 #include <net/xfrm.h> 50 #include <net/inet_hashtables.h> 51 #include <net/inet6_hashtables.h> 52 #include <net/busy_poll.h> 53 #include <net/sock_reuseport.h> 54 #include <net/gro.h> 55 56 #include <linux/proc_fs.h> 57 #include <linux/seq_file.h> 58 #include <trace/events/skb.h> 59 #include "udp_impl.h" 60 61 static void udpv6_destruct_sock(struct sock *sk) 62 { 63 udp_destruct_common(sk); 64 inet6_sock_destruct(sk); 65 } 66 67 int udpv6_init_sock(struct sock *sk) 68 { 69 udp_lib_init_sock(sk); 70 sk->sk_destruct = udpv6_destruct_sock; 71 set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags); 72 return 0; 73 } 74 75 INDIRECT_CALLABLE_SCOPE 76 u32 udp6_ehashfn(const struct net *net, 77 const struct in6_addr *laddr, 78 const u16 lport, 79 const struct in6_addr *faddr, 80 const __be16 fport) 81 { 82 u32 lhash, fhash; 83 84 net_get_random_once(&udp6_ehash_secret, 85 sizeof(udp6_ehash_secret)); 86 net_get_random_once(&udp_ipv6_hash_secret, 87 sizeof(udp_ipv6_hash_secret)); 88 89 lhash = (__force u32)laddr->s6_addr32[3]; 90 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 91 92 return __inet6_ehashfn(lhash, lport, fhash, fport, 93 udp6_ehash_secret + net_hash_mix(net)); 94 } 95 96 int udp_v6_get_port(struct sock *sk, unsigned short snum) 97 { 98 unsigned int hash2_nulladdr = 99 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 100 unsigned int hash2_partial = 101 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 102 103 /* precompute partial secondary hash */ 104 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 105 return udp_lib_get_port(sk, snum, hash2_nulladdr); 106 } 107 108 void udp_v6_rehash(struct sock *sk) 109 { 110 u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 111 &sk->sk_v6_rcv_saddr, 112 inet_sk(sk)->inet_num); 113 u16 new_hash4; 114 115 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) { 116 new_hash4 = udp_ehashfn(sock_net(sk), 117 sk->sk_rcv_saddr, sk->sk_num, 118 sk->sk_daddr, sk->sk_dport); 119 } else { 120 new_hash4 = udp6_ehashfn(sock_net(sk), 121 &sk->sk_v6_rcv_saddr, sk->sk_num, 122 &sk->sk_v6_daddr, sk->sk_dport); 123 } 124 125 udp_lib_rehash(sk, new_hash, new_hash4); 126 } 127 128 static int compute_score(struct sock *sk, const struct net *net, 129 const struct in6_addr *saddr, __be16 sport, 130 const struct in6_addr *daddr, unsigned short hnum, 131 int dif, int sdif) 132 { 133 int bound_dev_if, score; 134 struct inet_sock *inet; 135 bool dev_match; 136 137 if (!net_eq(sock_net(sk), net) || 138 udp_sk(sk)->udp_port_hash != hnum || 139 sk->sk_family != PF_INET6) 140 return -1; 141 142 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 143 return -1; 144 145 score = 0; 146 inet = inet_sk(sk); 147 148 if (inet->inet_dport) { 149 if (inet->inet_dport != sport) 150 return -1; 151 score++; 152 } 153 154 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 155 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 156 return -1; 157 score++; 158 } 159 160 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 161 dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif); 162 if (!dev_match) 163 return -1; 164 if (bound_dev_if) 165 score++; 166 167 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) 168 score++; 169 170 return score; 171 } 172 173 /** 174 * udp6_lib_lookup1() - Simplified lookup using primary hash (destination port) 175 * @net: Network namespace 176 * @saddr: Source address, network order 177 * @sport: Source port, network order 178 * @daddr: Destination address, network order 179 * @hnum: Destination port, host order 180 * @dif: Destination interface index 181 * @sdif: Destination bridge port index, if relevant 182 * @udptable: Set of UDP hash tables 183 * 184 * Simplified lookup to be used as fallback if no sockets are found due to a 185 * potential race between (receive) address change, and lookup happening before 186 * the rehash operation. This function ignores SO_REUSEPORT groups while scoring 187 * result sockets, because if we have one, we don't need the fallback at all. 188 * 189 * Called under rcu_read_lock(). 190 * 191 * Return: socket with highest matching score if any, NULL if none 192 */ 193 static struct sock *udp6_lib_lookup1(const struct net *net, 194 const struct in6_addr *saddr, __be16 sport, 195 const struct in6_addr *daddr, 196 unsigned int hnum, int dif, int sdif, 197 const struct udp_table *udptable) 198 { 199 unsigned int slot = udp_hashfn(net, hnum, udptable->mask); 200 struct udp_hslot *hslot = &udptable->hash[slot]; 201 struct sock *sk, *result = NULL; 202 int score, badness = 0; 203 204 sk_for_each_rcu(sk, &hslot->head) { 205 score = compute_score(sk, net, 206 saddr, sport, daddr, hnum, dif, sdif); 207 if (score > badness) { 208 result = sk; 209 badness = score; 210 } 211 } 212 213 return result; 214 } 215 216 /* called with rcu_read_lock() */ 217 static struct sock *udp6_lib_lookup2(const struct net *net, 218 const struct in6_addr *saddr, __be16 sport, 219 const struct in6_addr *daddr, unsigned int hnum, 220 int dif, int sdif, struct udp_hslot *hslot2, 221 struct sk_buff *skb) 222 { 223 struct sock *sk, *result; 224 int score, badness; 225 bool need_rescore; 226 227 result = NULL; 228 badness = -1; 229 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 230 need_rescore = false; 231 rescore: 232 score = compute_score(need_rescore ? result : sk, net, saddr, 233 sport, daddr, hnum, dif, sdif); 234 if (score > badness) { 235 badness = score; 236 237 if (need_rescore) 238 continue; 239 240 if (sk->sk_state == TCP_ESTABLISHED) { 241 result = sk; 242 continue; 243 } 244 245 result = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr), 246 saddr, sport, daddr, hnum, udp6_ehashfn); 247 if (!result) { 248 result = sk; 249 continue; 250 } 251 252 /* Fall back to scoring if group has connections */ 253 if (!reuseport_has_conns(sk)) 254 return result; 255 256 /* Reuseport logic returned an error, keep original score. */ 257 if (IS_ERR(result)) 258 continue; 259 260 /* compute_score is too long of a function to be 261 * inlined, and calling it again here yields 262 * measureable overhead for some 263 * workloads. Work around it by jumping 264 * backwards to rescore 'result'. 265 */ 266 need_rescore = true; 267 goto rescore; 268 } 269 } 270 return result; 271 } 272 273 #if IS_ENABLED(CONFIG_BASE_SMALL) 274 static struct sock *udp6_lib_lookup4(const struct net *net, 275 const struct in6_addr *saddr, __be16 sport, 276 const struct in6_addr *daddr, 277 unsigned int hnum, int dif, int sdif, 278 struct udp_table *udptable) 279 { 280 return NULL; 281 } 282 283 static void udp6_hash4(struct sock *sk) 284 { 285 } 286 #else /* !CONFIG_BASE_SMALL */ 287 static struct sock *udp6_lib_lookup4(const struct net *net, 288 const struct in6_addr *saddr, __be16 sport, 289 const struct in6_addr *daddr, 290 unsigned int hnum, int dif, int sdif, 291 struct udp_table *udptable) 292 { 293 const __portpair ports = INET_COMBINED_PORTS(sport, hnum); 294 const struct hlist_nulls_node *node; 295 struct udp_hslot *hslot4; 296 unsigned int hash4, slot; 297 struct udp_sock *up; 298 struct sock *sk; 299 300 hash4 = udp6_ehashfn(net, daddr, hnum, saddr, sport); 301 slot = hash4 & udptable->mask; 302 hslot4 = &udptable->hash4[slot]; 303 304 begin: 305 udp_lrpa_for_each_entry_rcu(up, node, &hslot4->nulls_head) { 306 sk = (struct sock *)up; 307 if (inet6_match(net, sk, saddr, daddr, ports, dif, sdif)) 308 return sk; 309 } 310 311 /* if the nulls value we got at the end of this lookup is not the 312 * expected one, we must restart lookup. We probably met an item that 313 * was moved to another chain due to rehash. 314 */ 315 if (get_nulls_value(node) != slot) 316 goto begin; 317 318 return NULL; 319 } 320 321 static void udp6_hash4(struct sock *sk) 322 { 323 struct net *net = sock_net(sk); 324 unsigned int hash; 325 326 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) { 327 udp4_hash4(sk); 328 return; 329 } 330 331 if (sk_unhashed(sk) || ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 332 return; 333 334 hash = udp6_ehashfn(net, &sk->sk_v6_rcv_saddr, sk->sk_num, 335 &sk->sk_v6_daddr, sk->sk_dport); 336 337 udp_lib_hash4(sk, hash); 338 } 339 #endif /* CONFIG_BASE_SMALL */ 340 341 /* rcu_read_lock() must be held */ 342 struct sock *__udp6_lib_lookup(const struct net *net, 343 const struct in6_addr *saddr, __be16 sport, 344 const struct in6_addr *daddr, __be16 dport, 345 int dif, int sdif, struct udp_table *udptable, 346 struct sk_buff *skb) 347 { 348 unsigned short hnum = ntohs(dport); 349 struct udp_hslot *hslot2; 350 struct sock *result, *sk; 351 unsigned int hash2; 352 353 hash2 = ipv6_portaddr_hash(net, daddr, hnum); 354 hslot2 = udp_hashslot2(udptable, hash2); 355 356 if (udp_has_hash4(hslot2)) { 357 result = udp6_lib_lookup4(net, saddr, sport, daddr, hnum, 358 dif, sdif, udptable); 359 if (result) /* udp6_lib_lookup4 return sk or NULL */ 360 return result; 361 } 362 363 /* Lookup connected or non-wildcard sockets */ 364 result = udp6_lib_lookup2(net, saddr, sport, 365 daddr, hnum, dif, sdif, 366 hslot2, skb); 367 if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) 368 goto done; 369 370 /* Lookup redirect from BPF */ 371 if (static_branch_unlikely(&bpf_sk_lookup_enabled) && 372 udptable == net->ipv4.udp_table) { 373 sk = inet6_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr), 374 saddr, sport, daddr, hnum, dif, 375 udp6_ehashfn); 376 if (sk) { 377 result = sk; 378 goto done; 379 } 380 } 381 382 /* Got non-wildcard socket or error on first lookup */ 383 if (result) 384 goto done; 385 386 /* Lookup wildcard sockets */ 387 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 388 hslot2 = udp_hashslot2(udptable, hash2); 389 390 result = udp6_lib_lookup2(net, saddr, sport, 391 &in6addr_any, hnum, dif, sdif, 392 hslot2, skb); 393 if (!IS_ERR_OR_NULL(result)) 394 goto done; 395 396 /* Cover address change/lookup/rehash race: see __udp4_lib_lookup() */ 397 result = udp6_lib_lookup1(net, saddr, sport, daddr, hnum, dif, sdif, 398 udptable); 399 400 done: 401 if (IS_ERR(result)) 402 return NULL; 403 return result; 404 } 405 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 406 407 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 408 __be16 sport, __be16 dport, 409 struct udp_table *udptable) 410 { 411 const struct ipv6hdr *iph = ipv6_hdr(skb); 412 413 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 414 &iph->daddr, dport, inet6_iif(skb), 415 inet6_sdif(skb), udptable, skb); 416 } 417 418 struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, 419 __be16 sport, __be16 dport) 420 { 421 const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation]; 422 const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset); 423 struct net *net = dev_net(skb->dev); 424 int iif, sdif; 425 426 inet6_get_iif_sdif(skb, &iif, &sdif); 427 428 return __udp6_lib_lookup(net, &iph->saddr, sport, 429 &iph->daddr, dport, iif, 430 sdif, net->ipv4.udp_table, NULL); 431 } 432 433 /* Must be called under rcu_read_lock(). 434 * Does increment socket refcount. 435 */ 436 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 437 struct sock *udp6_lib_lookup(const struct net *net, const struct in6_addr *saddr, __be16 sport, 438 const struct in6_addr *daddr, __be16 dport, int dif) 439 { 440 struct sock *sk; 441 442 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 443 dif, 0, net->ipv4.udp_table, NULL); 444 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 445 sk = NULL; 446 return sk; 447 } 448 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 449 #endif 450 451 /* do not use the scratch area len for jumbogram: their length execeeds the 452 * scratch area space; note that the IP6CB flags is still in the first 453 * cacheline, so checking for jumbograms is cheap 454 */ 455 static int udp6_skb_len(struct sk_buff *skb) 456 { 457 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 458 } 459 460 /* 461 * This should be easy, if there is something there we 462 * return it, otherwise we block. 463 */ 464 465 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 466 int flags, int *addr_len) 467 { 468 struct ipv6_pinfo *np = inet6_sk(sk); 469 struct inet_sock *inet = inet_sk(sk); 470 struct sk_buff *skb; 471 unsigned int ulen, copied; 472 int off, err, peeking = flags & MSG_PEEK; 473 int is_udplite = IS_UDPLITE(sk); 474 struct udp_mib __percpu *mib; 475 bool checksum_valid = false; 476 int is_udp4; 477 478 if (flags & MSG_ERRQUEUE) 479 return ipv6_recv_error(sk, msg, len, addr_len); 480 481 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 482 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 483 484 try_again: 485 off = sk_peek_offset(sk, flags); 486 skb = __skb_recv_udp(sk, flags, &off, &err); 487 if (!skb) 488 return err; 489 490 ulen = udp6_skb_len(skb); 491 copied = len; 492 if (copied > ulen - off) 493 copied = ulen - off; 494 else if (copied < ulen) 495 msg->msg_flags |= MSG_TRUNC; 496 497 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 498 mib = __UDPX_MIB(sk, is_udp4); 499 500 /* 501 * If checksum is needed at all, try to do it while copying the 502 * data. If the data is truncated, or if we only want a partial 503 * coverage checksum (UDP-Lite), do it before the copy. 504 */ 505 506 if (copied < ulen || peeking || 507 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 508 checksum_valid = udp_skb_csum_unnecessary(skb) || 509 !__udp_lib_checksum_complete(skb); 510 if (!checksum_valid) 511 goto csum_copy_err; 512 } 513 514 if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 515 if (udp_skb_is_linear(skb)) 516 err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 517 else 518 err = skb_copy_datagram_msg(skb, off, msg, copied); 519 } else { 520 err = skb_copy_and_csum_datagram_msg(skb, off, msg); 521 if (err == -EINVAL) 522 goto csum_copy_err; 523 } 524 if (unlikely(err)) { 525 if (!peeking) { 526 atomic_inc(&sk->sk_drops); 527 SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 528 } 529 kfree_skb(skb); 530 return err; 531 } 532 if (!peeking) 533 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 534 535 sock_recv_cmsgs(msg, sk, skb); 536 537 /* Copy the address. */ 538 if (msg->msg_name) { 539 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 540 sin6->sin6_family = AF_INET6; 541 sin6->sin6_port = udp_hdr(skb)->source; 542 sin6->sin6_flowinfo = 0; 543 544 if (is_udp4) { 545 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 546 &sin6->sin6_addr); 547 sin6->sin6_scope_id = 0; 548 } else { 549 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 550 sin6->sin6_scope_id = 551 ipv6_iface_scope_id(&sin6->sin6_addr, 552 inet6_iif(skb)); 553 } 554 *addr_len = sizeof(*sin6); 555 556 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, 557 (struct sockaddr *)sin6, 558 addr_len); 559 } 560 561 if (udp_test_bit(GRO_ENABLED, sk)) 562 udp_cmsg_recv(msg, sk, skb); 563 564 if (np->rxopt.all) 565 ip6_datagram_recv_common_ctl(sk, msg, skb); 566 567 if (is_udp4) { 568 if (inet_cmsg_flags(inet)) 569 ip_cmsg_recv_offset(msg, sk, skb, 570 sizeof(struct udphdr), off); 571 } else { 572 if (np->rxopt.all) 573 ip6_datagram_recv_specific_ctl(sk, msg, skb); 574 } 575 576 err = copied; 577 if (flags & MSG_TRUNC) 578 err = ulen; 579 580 skb_consume_udp(sk, skb, peeking ? -err : err); 581 return err; 582 583 csum_copy_err: 584 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 585 udp_skb_destructor)) { 586 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 587 SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 588 } 589 kfree_skb(skb); 590 591 /* starting over for a new packet, but check if we need to yield */ 592 cond_resched(); 593 msg->msg_flags &= ~MSG_TRUNC; 594 goto try_again; 595 } 596 597 DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 598 void udpv6_encap_enable(void) 599 { 600 static_branch_inc(&udpv6_encap_needed_key); 601 } 602 EXPORT_SYMBOL(udpv6_encap_enable); 603 604 /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 605 * through error handlers in encapsulations looking for a match. 606 */ 607 static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 608 struct inet6_skb_parm *opt, 609 u8 type, u8 code, int offset, __be32 info) 610 { 611 int i; 612 613 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 614 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 615 u8 type, u8 code, int offset, __be32 info); 616 const struct ip6_tnl_encap_ops *encap; 617 618 encap = rcu_dereference(ip6tun_encaps[i]); 619 if (!encap) 620 continue; 621 handler = encap->err_handler; 622 if (handler && !handler(skb, opt, type, code, offset, info)) 623 return 0; 624 } 625 626 return -ENOENT; 627 } 628 629 /* Try to match ICMP errors to UDP tunnels by looking up a socket without 630 * reversing source and destination port: this will match tunnels that force the 631 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 632 * lwtunnels might actually break this assumption by being configured with 633 * different destination ports on endpoints, in this case we won't be able to 634 * trace ICMP messages back to them. 635 * 636 * If this doesn't match any socket, probe tunnels with arbitrary destination 637 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 638 * we've sent packets to won't necessarily match the local destination port. 639 * 640 * Then ask the tunnel implementation to match the error against a valid 641 * association. 642 * 643 * Return an error if we can't find a match, the socket if we need further 644 * processing, zero otherwise. 645 */ 646 static struct sock *__udp6_lib_err_encap(struct net *net, 647 const struct ipv6hdr *hdr, int offset, 648 struct udphdr *uh, 649 struct udp_table *udptable, 650 struct sock *sk, 651 struct sk_buff *skb, 652 struct inet6_skb_parm *opt, 653 u8 type, u8 code, __be32 info) 654 { 655 int (*lookup)(struct sock *sk, struct sk_buff *skb); 656 int network_offset, transport_offset; 657 struct udp_sock *up; 658 659 network_offset = skb_network_offset(skb); 660 transport_offset = skb_transport_offset(skb); 661 662 /* Network header needs to point to the outer IPv6 header inside ICMP */ 663 skb_reset_network_header(skb); 664 665 /* Transport header needs to point to the UDP header */ 666 skb_set_transport_header(skb, offset); 667 668 if (sk) { 669 up = udp_sk(sk); 670 671 lookup = READ_ONCE(up->encap_err_lookup); 672 if (lookup && lookup(sk, skb)) 673 sk = NULL; 674 675 goto out; 676 } 677 678 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 679 &hdr->saddr, uh->dest, 680 inet6_iif(skb), 0, udptable, skb); 681 if (sk) { 682 up = udp_sk(sk); 683 684 lookup = READ_ONCE(up->encap_err_lookup); 685 if (!lookup || lookup(sk, skb)) 686 sk = NULL; 687 } 688 689 out: 690 if (!sk) { 691 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 692 offset, info)); 693 } 694 695 skb_set_transport_header(skb, transport_offset); 696 skb_set_network_header(skb, network_offset); 697 698 return sk; 699 } 700 701 int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 702 u8 type, u8 code, int offset, __be32 info, 703 struct udp_table *udptable) 704 { 705 struct ipv6_pinfo *np; 706 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 707 const struct in6_addr *saddr = &hdr->saddr; 708 const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; 709 struct udphdr *uh = (struct udphdr *)(skb->data+offset); 710 bool tunnel = false; 711 struct sock *sk; 712 int harderr; 713 int err; 714 struct net *net = dev_net(skb->dev); 715 716 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 717 inet6_iif(skb), inet6_sdif(skb), udptable, NULL); 718 719 if (!sk || READ_ONCE(udp_sk(sk)->encap_type)) { 720 /* No socket for error: try tunnels before discarding */ 721 if (static_branch_unlikely(&udpv6_encap_needed_key)) { 722 sk = __udp6_lib_err_encap(net, hdr, offset, uh, 723 udptable, sk, skb, 724 opt, type, code, info); 725 if (!sk) 726 return 0; 727 } else 728 sk = ERR_PTR(-ENOENT); 729 730 if (IS_ERR(sk)) { 731 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 732 ICMP6_MIB_INERRORS); 733 return PTR_ERR(sk); 734 } 735 736 tunnel = true; 737 } 738 739 harderr = icmpv6_err_convert(type, code, &err); 740 np = inet6_sk(sk); 741 742 if (type == ICMPV6_PKT_TOOBIG) { 743 if (!ip6_sk_accept_pmtu(sk)) 744 goto out; 745 ip6_sk_update_pmtu(skb, sk, info); 746 if (READ_ONCE(np->pmtudisc) != IPV6_PMTUDISC_DONT) 747 harderr = 1; 748 } 749 if (type == NDISC_REDIRECT) { 750 if (tunnel) { 751 ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 752 READ_ONCE(sk->sk_mark), sk->sk_uid); 753 } else { 754 ip6_sk_redirect(skb, sk); 755 } 756 goto out; 757 } 758 759 /* Tunnels don't have an application socket: don't pass errors back */ 760 if (tunnel) { 761 if (udp_sk(sk)->encap_err_rcv) 762 udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest, 763 ntohl(info), (u8 *)(uh+1)); 764 goto out; 765 } 766 767 if (!inet6_test_bit(RECVERR6, sk)) { 768 if (!harderr || sk->sk_state != TCP_ESTABLISHED) 769 goto out; 770 } else { 771 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 772 } 773 774 sk->sk_err = err; 775 sk_error_report(sk); 776 out: 777 return 0; 778 } 779 780 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 781 { 782 int rc; 783 784 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 785 sock_rps_save_rxhash(sk, skb); 786 sk_mark_napi_id(sk, skb); 787 sk_incoming_cpu_update(sk); 788 } else { 789 sk_mark_napi_id_once(sk, skb); 790 } 791 792 rc = __udp_enqueue_schedule_skb(sk, skb); 793 if (rc < 0) { 794 int is_udplite = IS_UDPLITE(sk); 795 enum skb_drop_reason drop_reason; 796 797 /* Note that an ENOMEM error is charged twice */ 798 if (rc == -ENOMEM) { 799 UDP6_INC_STATS(sock_net(sk), 800 UDP_MIB_RCVBUFERRORS, is_udplite); 801 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; 802 } else { 803 UDP6_INC_STATS(sock_net(sk), 804 UDP_MIB_MEMERRORS, is_udplite); 805 drop_reason = SKB_DROP_REASON_PROTO_MEM; 806 } 807 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 808 trace_udp_fail_queue_rcv_skb(rc, sk, skb); 809 sk_skb_reason_drop(sk, skb, drop_reason); 810 return -1; 811 } 812 813 return 0; 814 } 815 816 static __inline__ int udpv6_err(struct sk_buff *skb, 817 struct inet6_skb_parm *opt, u8 type, 818 u8 code, int offset, __be32 info) 819 { 820 return __udp6_lib_err(skb, opt, type, code, offset, info, 821 dev_net(skb->dev)->ipv4.udp_table); 822 } 823 824 static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 825 { 826 enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; 827 struct udp_sock *up = udp_sk(sk); 828 int is_udplite = IS_UDPLITE(sk); 829 830 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 831 drop_reason = SKB_DROP_REASON_XFRM_POLICY; 832 goto drop; 833 } 834 nf_reset_ct(skb); 835 836 if (static_branch_unlikely(&udpv6_encap_needed_key) && 837 READ_ONCE(up->encap_type)) { 838 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 839 840 /* 841 * This is an encapsulation socket so pass the skb to 842 * the socket's udp_encap_rcv() hook. Otherwise, just 843 * fall through and pass this up the UDP socket. 844 * up->encap_rcv() returns the following value: 845 * =0 if skb was successfully passed to the encap 846 * handler or was discarded by it. 847 * >0 if skb should be passed on to UDP. 848 * <0 if skb should be resubmitted as proto -N 849 */ 850 851 /* if we're overly short, let UDP handle it */ 852 encap_rcv = READ_ONCE(up->encap_rcv); 853 if (encap_rcv) { 854 int ret; 855 856 /* Verify checksum before giving to encap */ 857 if (udp_lib_checksum_complete(skb)) 858 goto csum_error; 859 860 ret = encap_rcv(sk, skb); 861 if (ret <= 0) { 862 __UDP6_INC_STATS(sock_net(sk), 863 UDP_MIB_INDATAGRAMS, 864 is_udplite); 865 return -ret; 866 } 867 } 868 869 /* FALLTHROUGH -- it's a UDP Packet */ 870 } 871 872 /* 873 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 874 */ 875 if (udp_test_bit(UDPLITE_RECV_CC, sk) && UDP_SKB_CB(skb)->partial_cov) { 876 u16 pcrlen = READ_ONCE(up->pcrlen); 877 878 if (pcrlen == 0) { /* full coverage was set */ 879 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 880 UDP_SKB_CB(skb)->cscov, skb->len); 881 goto drop; 882 } 883 if (UDP_SKB_CB(skb)->cscov < pcrlen) { 884 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 885 UDP_SKB_CB(skb)->cscov, pcrlen); 886 goto drop; 887 } 888 } 889 890 prefetch(&sk->sk_rmem_alloc); 891 if (rcu_access_pointer(sk->sk_filter) && 892 udp_lib_checksum_complete(skb)) 893 goto csum_error; 894 895 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) { 896 drop_reason = SKB_DROP_REASON_SOCKET_FILTER; 897 goto drop; 898 } 899 900 udp_csum_pull_header(skb); 901 902 skb_dst_drop(skb); 903 904 return __udpv6_queue_rcv_skb(sk, skb); 905 906 csum_error: 907 drop_reason = SKB_DROP_REASON_UDP_CSUM; 908 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 909 drop: 910 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 911 atomic_inc(&sk->sk_drops); 912 sk_skb_reason_drop(sk, skb, drop_reason); 913 return -1; 914 } 915 916 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 917 { 918 struct sk_buff *next, *segs; 919 int ret; 920 921 if (likely(!udp_unexpected_gso(sk, skb))) 922 return udpv6_queue_rcv_one_skb(sk, skb); 923 924 __skb_push(skb, -skb_mac_offset(skb)); 925 segs = udp_rcv_segment(sk, skb, false); 926 skb_list_walk_safe(segs, skb, next) { 927 __skb_pull(skb, skb_transport_offset(skb)); 928 929 udp_post_segment_fix_csum(skb); 930 ret = udpv6_queue_rcv_one_skb(sk, skb); 931 if (ret > 0) 932 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 933 true); 934 } 935 return 0; 936 } 937 938 static bool __udp_v6_is_mcast_sock(struct net *net, const struct sock *sk, 939 __be16 loc_port, const struct in6_addr *loc_addr, 940 __be16 rmt_port, const struct in6_addr *rmt_addr, 941 int dif, int sdif, unsigned short hnum) 942 { 943 const struct inet_sock *inet = inet_sk(sk); 944 945 if (!net_eq(sock_net(sk), net)) 946 return false; 947 948 if (udp_sk(sk)->udp_port_hash != hnum || 949 sk->sk_family != PF_INET6 || 950 (inet->inet_dport && inet->inet_dport != rmt_port) || 951 (!ipv6_addr_any(&sk->sk_v6_daddr) && 952 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 953 !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) || 954 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 955 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 956 return false; 957 if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 958 return false; 959 return true; 960 } 961 962 static void udp6_csum_zero_error(struct sk_buff *skb) 963 { 964 /* RFC 2460 section 8.1 says that we SHOULD log 965 * this error. Well, it is reasonable. 966 */ 967 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 968 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 969 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 970 } 971 972 /* 973 * Note: called only from the BH handler context, 974 * so we don't need to lock the hashes. 975 */ 976 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 977 const struct in6_addr *saddr, const struct in6_addr *daddr, 978 struct udp_table *udptable, int proto) 979 { 980 struct sock *sk, *first = NULL; 981 const struct udphdr *uh = udp_hdr(skb); 982 unsigned short hnum = ntohs(uh->dest); 983 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 984 unsigned int offset = offsetof(typeof(*sk), sk_node); 985 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 986 int dif = inet6_iif(skb); 987 int sdif = inet6_sdif(skb); 988 struct hlist_node *node; 989 struct sk_buff *nskb; 990 991 if (use_hash2) { 992 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 993 udptable->mask; 994 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 995 start_lookup: 996 hslot = &udptable->hash2[hash2].hslot; 997 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 998 } 999 1000 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 1001 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 1002 uh->source, saddr, dif, sdif, 1003 hnum)) 1004 continue; 1005 /* If zero checksum and no_check is not on for 1006 * the socket then skip it. 1007 */ 1008 if (!uh->check && !udp_get_no_check6_rx(sk)) 1009 continue; 1010 if (!first) { 1011 first = sk; 1012 continue; 1013 } 1014 nskb = skb_clone(skb, GFP_ATOMIC); 1015 if (unlikely(!nskb)) { 1016 atomic_inc(&sk->sk_drops); 1017 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 1018 IS_UDPLITE(sk)); 1019 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 1020 IS_UDPLITE(sk)); 1021 continue; 1022 } 1023 1024 if (udpv6_queue_rcv_skb(sk, nskb) > 0) 1025 consume_skb(nskb); 1026 } 1027 1028 /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 1029 if (use_hash2 && hash2 != hash2_any) { 1030 hash2 = hash2_any; 1031 goto start_lookup; 1032 } 1033 1034 if (first) { 1035 if (udpv6_queue_rcv_skb(first, skb) > 0) 1036 consume_skb(skb); 1037 } else { 1038 kfree_skb(skb); 1039 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 1040 proto == IPPROTO_UDPLITE); 1041 } 1042 return 0; 1043 } 1044 1045 static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 1046 { 1047 if (udp_sk_rx_dst_set(sk, dst)) 1048 sk->sk_rx_dst_cookie = rt6_get_cookie(dst_rt6_info(dst)); 1049 } 1050 1051 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 1052 * return code conversion for ip layer consumption 1053 */ 1054 static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 1055 struct udphdr *uh) 1056 { 1057 int ret; 1058 1059 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 1060 skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); 1061 1062 ret = udpv6_queue_rcv_skb(sk, skb); 1063 1064 /* a return value > 0 means to resubmit the input */ 1065 if (ret > 0) 1066 return ret; 1067 return 0; 1068 } 1069 1070 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 1071 int proto) 1072 { 1073 enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; 1074 const struct in6_addr *saddr, *daddr; 1075 struct net *net = dev_net(skb->dev); 1076 struct sock *sk = NULL; 1077 struct udphdr *uh; 1078 bool refcounted; 1079 u32 ulen = 0; 1080 1081 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 1082 goto discard; 1083 1084 saddr = &ipv6_hdr(skb)->saddr; 1085 daddr = &ipv6_hdr(skb)->daddr; 1086 uh = udp_hdr(skb); 1087 1088 ulen = ntohs(uh->len); 1089 if (ulen > skb->len) 1090 goto short_packet; 1091 1092 if (proto == IPPROTO_UDP) { 1093 /* UDP validates ulen. */ 1094 1095 /* Check for jumbo payload */ 1096 if (ulen == 0) 1097 ulen = skb->len; 1098 1099 if (ulen < sizeof(*uh)) 1100 goto short_packet; 1101 1102 if (ulen < skb->len) { 1103 if (pskb_trim_rcsum(skb, ulen)) 1104 goto short_packet; 1105 saddr = &ipv6_hdr(skb)->saddr; 1106 daddr = &ipv6_hdr(skb)->daddr; 1107 uh = udp_hdr(skb); 1108 } 1109 } 1110 1111 if (udp6_csum_init(skb, uh, proto)) 1112 goto csum_error; 1113 1114 /* Check if the socket is already available, e.g. due to early demux */ 1115 sk = inet6_steal_sock(net, skb, sizeof(struct udphdr), saddr, uh->source, daddr, uh->dest, 1116 &refcounted, udp6_ehashfn); 1117 if (IS_ERR(sk)) 1118 goto no_sk; 1119 1120 if (sk) { 1121 struct dst_entry *dst = skb_dst(skb); 1122 int ret; 1123 1124 if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst)) 1125 udp6_sk_rx_dst_set(sk, dst); 1126 1127 if (!uh->check && !udp_get_no_check6_rx(sk)) { 1128 if (refcounted) 1129 sock_put(sk); 1130 goto report_csum_error; 1131 } 1132 1133 ret = udp6_unicast_rcv_skb(sk, skb, uh); 1134 if (refcounted) 1135 sock_put(sk); 1136 return ret; 1137 } 1138 1139 /* 1140 * Multicast receive code 1141 */ 1142 if (ipv6_addr_is_multicast(daddr)) 1143 return __udp6_lib_mcast_deliver(net, skb, 1144 saddr, daddr, udptable, proto); 1145 1146 /* Unicast */ 1147 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 1148 if (sk) { 1149 if (!uh->check && !udp_get_no_check6_rx(sk)) 1150 goto report_csum_error; 1151 return udp6_unicast_rcv_skb(sk, skb, uh); 1152 } 1153 no_sk: 1154 reason = SKB_DROP_REASON_NO_SOCKET; 1155 1156 if (!uh->check) 1157 goto report_csum_error; 1158 1159 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 1160 goto discard; 1161 nf_reset_ct(skb); 1162 1163 if (udp_lib_checksum_complete(skb)) 1164 goto csum_error; 1165 1166 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 1167 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 1168 1169 sk_skb_reason_drop(sk, skb, reason); 1170 return 0; 1171 1172 short_packet: 1173 if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 1174 reason = SKB_DROP_REASON_PKT_TOO_SMALL; 1175 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 1176 proto == IPPROTO_UDPLITE ? "-Lite" : "", 1177 saddr, ntohs(uh->source), 1178 ulen, skb->len, 1179 daddr, ntohs(uh->dest)); 1180 goto discard; 1181 1182 report_csum_error: 1183 udp6_csum_zero_error(skb); 1184 csum_error: 1185 if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 1186 reason = SKB_DROP_REASON_UDP_CSUM; 1187 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 1188 discard: 1189 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 1190 sk_skb_reason_drop(sk, skb, reason); 1191 return 0; 1192 } 1193 1194 1195 static struct sock *__udp6_lib_demux_lookup(struct net *net, 1196 __be16 loc_port, const struct in6_addr *loc_addr, 1197 __be16 rmt_port, const struct in6_addr *rmt_addr, 1198 int dif, int sdif) 1199 { 1200 struct udp_table *udptable = net->ipv4.udp_table; 1201 unsigned short hnum = ntohs(loc_port); 1202 struct udp_hslot *hslot2; 1203 unsigned int hash2; 1204 __portpair ports; 1205 struct sock *sk; 1206 1207 hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 1208 hslot2 = udp_hashslot2(udptable, hash2); 1209 ports = INET_COMBINED_PORTS(rmt_port, hnum); 1210 1211 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 1212 if (sk->sk_state == TCP_ESTABLISHED && 1213 inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif)) 1214 return sk; 1215 /* Only check first socket in chain */ 1216 break; 1217 } 1218 return NULL; 1219 } 1220 1221 void udp_v6_early_demux(struct sk_buff *skb) 1222 { 1223 struct net *net = dev_net(skb->dev); 1224 const struct udphdr *uh; 1225 struct sock *sk; 1226 struct dst_entry *dst; 1227 int dif = skb->dev->ifindex; 1228 int sdif = inet6_sdif(skb); 1229 1230 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 1231 sizeof(struct udphdr))) 1232 return; 1233 1234 uh = udp_hdr(skb); 1235 1236 if (skb->pkt_type == PACKET_HOST) 1237 sk = __udp6_lib_demux_lookup(net, uh->dest, 1238 &ipv6_hdr(skb)->daddr, 1239 uh->source, &ipv6_hdr(skb)->saddr, 1240 dif, sdif); 1241 else 1242 return; 1243 1244 if (!sk) 1245 return; 1246 1247 skb->sk = sk; 1248 DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk)); 1249 skb->destructor = sock_pfree; 1250 dst = rcu_dereference(sk->sk_rx_dst); 1251 1252 if (dst) 1253 dst = dst_check(dst, sk->sk_rx_dst_cookie); 1254 if (dst) { 1255 /* set noref for now. 1256 * any place which wants to hold dst has to call 1257 * dst_hold_safe() 1258 */ 1259 skb_dst_set_noref(skb, dst); 1260 } 1261 } 1262 1263 INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) 1264 { 1265 return __udp6_lib_rcv(skb, dev_net(skb->dev)->ipv4.udp_table, IPPROTO_UDP); 1266 } 1267 1268 /* 1269 * Throw away all pending data and cancel the corking. Socket is locked. 1270 */ 1271 static void udp_v6_flush_pending_frames(struct sock *sk) 1272 { 1273 struct udp_sock *up = udp_sk(sk); 1274 1275 if (up->pending == AF_INET) 1276 udp_flush_pending_frames(sk); 1277 else if (up->pending) { 1278 up->len = 0; 1279 WRITE_ONCE(up->pending, 0); 1280 ip6_flush_pending_frames(sk); 1281 } 1282 } 1283 1284 static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1285 int addr_len) 1286 { 1287 if (addr_len < offsetofend(struct sockaddr, sa_family)) 1288 return -EINVAL; 1289 /* The following checks are replicated from __ip6_datagram_connect() 1290 * and intended to prevent BPF program called below from accessing 1291 * bytes that are out of the bound specified by user in addr_len. 1292 */ 1293 if (uaddr->sa_family == AF_INET) { 1294 if (ipv6_only_sock(sk)) 1295 return -EAFNOSUPPORT; 1296 return udp_pre_connect(sk, uaddr, addr_len); 1297 } 1298 1299 if (addr_len < SIN6_LEN_RFC2133) 1300 return -EINVAL; 1301 1302 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr, &addr_len); 1303 } 1304 1305 static int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 1306 { 1307 int res; 1308 1309 lock_sock(sk); 1310 res = __ip6_datagram_connect(sk, uaddr, addr_len); 1311 if (!res) 1312 udp6_hash4(sk); 1313 release_sock(sk); 1314 return res; 1315 } 1316 1317 /** 1318 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1319 * @sk: socket we are sending on 1320 * @skb: sk_buff containing the filled-in UDP header 1321 * (checksum field must be zeroed out) 1322 * @saddr: source address 1323 * @daddr: destination address 1324 * @len: length of packet 1325 */ 1326 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1327 const struct in6_addr *saddr, 1328 const struct in6_addr *daddr, int len) 1329 { 1330 unsigned int offset; 1331 struct udphdr *uh = udp_hdr(skb); 1332 struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1333 __wsum csum = 0; 1334 1335 if (!frags) { 1336 /* Only one fragment on the socket. */ 1337 skb->csum_start = skb_transport_header(skb) - skb->head; 1338 skb->csum_offset = offsetof(struct udphdr, check); 1339 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1340 } else { 1341 /* 1342 * HW-checksum won't work as there are two or more 1343 * fragments on the socket so that all csums of sk_buffs 1344 * should be together 1345 */ 1346 offset = skb_transport_offset(skb); 1347 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 1348 csum = skb->csum; 1349 1350 skb->ip_summed = CHECKSUM_NONE; 1351 1352 do { 1353 csum = csum_add(csum, frags->csum); 1354 } while ((frags = frags->next)); 1355 1356 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1357 csum); 1358 if (uh->check == 0) 1359 uh->check = CSUM_MANGLED_0; 1360 } 1361 } 1362 1363 /* 1364 * Sending 1365 */ 1366 1367 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1368 struct inet_cork *cork) 1369 { 1370 struct sock *sk = skb->sk; 1371 struct udphdr *uh; 1372 int err = 0; 1373 int is_udplite = IS_UDPLITE(sk); 1374 __wsum csum = 0; 1375 int offset = skb_transport_offset(skb); 1376 int len = skb->len - offset; 1377 int datalen = len - sizeof(*uh); 1378 1379 /* 1380 * Create a UDP header 1381 */ 1382 uh = udp_hdr(skb); 1383 uh->source = fl6->fl6_sport; 1384 uh->dest = fl6->fl6_dport; 1385 uh->len = htons(len); 1386 uh->check = 0; 1387 1388 if (cork->gso_size) { 1389 const int hlen = skb_network_header_len(skb) + 1390 sizeof(struct udphdr); 1391 1392 if (hlen + cork->gso_size > cork->fragsize) { 1393 kfree_skb(skb); 1394 return -EINVAL; 1395 } 1396 if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { 1397 kfree_skb(skb); 1398 return -EINVAL; 1399 } 1400 if (udp_get_no_check6_tx(sk)) { 1401 kfree_skb(skb); 1402 return -EINVAL; 1403 } 1404 if (is_udplite || dst_xfrm(skb_dst(skb))) { 1405 kfree_skb(skb); 1406 return -EIO; 1407 } 1408 1409 if (datalen > cork->gso_size) { 1410 skb_shinfo(skb)->gso_size = cork->gso_size; 1411 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 1412 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, 1413 cork->gso_size); 1414 1415 /* Don't checksum the payload, skb will get segmented */ 1416 goto csum_partial; 1417 } 1418 } 1419 1420 if (is_udplite) 1421 csum = udplite_csum(skb); 1422 else if (udp_get_no_check6_tx(sk)) { /* UDP csum disabled */ 1423 skb->ip_summed = CHECKSUM_NONE; 1424 goto send; 1425 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1426 csum_partial: 1427 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1428 goto send; 1429 } else 1430 csum = udp_csum(skb); 1431 1432 /* add protocol-dependent pseudo-header */ 1433 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1434 len, fl6->flowi6_proto, csum); 1435 if (uh->check == 0) 1436 uh->check = CSUM_MANGLED_0; 1437 1438 send: 1439 err = ip6_send_skb(skb); 1440 if (err) { 1441 if (err == -ENOBUFS && !inet6_test_bit(RECVERR6, sk)) { 1442 UDP6_INC_STATS(sock_net(sk), 1443 UDP_MIB_SNDBUFERRORS, is_udplite); 1444 err = 0; 1445 } 1446 } else { 1447 UDP6_INC_STATS(sock_net(sk), 1448 UDP_MIB_OUTDATAGRAMS, is_udplite); 1449 } 1450 return err; 1451 } 1452 1453 static int udp_v6_push_pending_frames(struct sock *sk) 1454 { 1455 struct sk_buff *skb; 1456 struct udp_sock *up = udp_sk(sk); 1457 int err = 0; 1458 1459 if (up->pending == AF_INET) 1460 return udp_push_pending_frames(sk); 1461 1462 skb = ip6_finish_skb(sk); 1463 if (!skb) 1464 goto out; 1465 1466 err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, 1467 &inet_sk(sk)->cork.base); 1468 out: 1469 up->len = 0; 1470 WRITE_ONCE(up->pending, 0); 1471 return err; 1472 } 1473 1474 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1475 { 1476 struct ipv6_txoptions opt_space; 1477 struct udp_sock *up = udp_sk(sk); 1478 struct inet_sock *inet = inet_sk(sk); 1479 struct ipv6_pinfo *np = inet6_sk(sk); 1480 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 1481 struct in6_addr *daddr, *final_p, final; 1482 struct ipv6_txoptions *opt = NULL; 1483 struct ipv6_txoptions *opt_to_free = NULL; 1484 struct ip6_flowlabel *flowlabel = NULL; 1485 struct inet_cork_full cork; 1486 struct flowi6 *fl6 = &cork.fl.u.ip6; 1487 struct dst_entry *dst; 1488 struct ipcm6_cookie ipc6; 1489 int addr_len = msg->msg_namelen; 1490 bool connected = false; 1491 int ulen = len; 1492 int corkreq = udp_test_bit(CORK, sk) || msg->msg_flags & MSG_MORE; 1493 int err; 1494 int is_udplite = IS_UDPLITE(sk); 1495 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1496 1497 ipcm6_init(&ipc6); 1498 ipc6.gso_size = READ_ONCE(up->gso_size); 1499 ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags); 1500 ipc6.sockc.mark = READ_ONCE(sk->sk_mark); 1501 ipc6.sockc.priority = READ_ONCE(sk->sk_priority); 1502 1503 /* destination address check */ 1504 if (sin6) { 1505 if (addr_len < offsetof(struct sockaddr, sa_data)) 1506 return -EINVAL; 1507 1508 switch (sin6->sin6_family) { 1509 case AF_INET6: 1510 if (addr_len < SIN6_LEN_RFC2133) 1511 return -EINVAL; 1512 daddr = &sin6->sin6_addr; 1513 if (ipv6_addr_any(daddr) && 1514 ipv6_addr_v4mapped(&np->saddr)) 1515 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1516 daddr); 1517 break; 1518 case AF_INET: 1519 goto do_udp_sendmsg; 1520 case AF_UNSPEC: 1521 msg->msg_name = sin6 = NULL; 1522 msg->msg_namelen = addr_len = 0; 1523 daddr = NULL; 1524 break; 1525 default: 1526 return -EINVAL; 1527 } 1528 } else if (!READ_ONCE(up->pending)) { 1529 if (sk->sk_state != TCP_ESTABLISHED) 1530 return -EDESTADDRREQ; 1531 daddr = &sk->sk_v6_daddr; 1532 } else 1533 daddr = NULL; 1534 1535 if (daddr) { 1536 if (ipv6_addr_v4mapped(daddr)) { 1537 struct sockaddr_in sin; 1538 sin.sin_family = AF_INET; 1539 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1540 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1541 msg->msg_name = &sin; 1542 msg->msg_namelen = sizeof(sin); 1543 do_udp_sendmsg: 1544 err = ipv6_only_sock(sk) ? 1545 -ENETUNREACH : udp_sendmsg(sk, msg, len); 1546 msg->msg_name = sin6; 1547 msg->msg_namelen = addr_len; 1548 return err; 1549 } 1550 } 1551 1552 /* Rough check on arithmetic overflow, 1553 better check is made in ip6_append_data(). 1554 */ 1555 if (len > INT_MAX - sizeof(struct udphdr)) 1556 return -EMSGSIZE; 1557 1558 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1559 if (READ_ONCE(up->pending)) { 1560 if (READ_ONCE(up->pending) == AF_INET) 1561 return udp_sendmsg(sk, msg, len); 1562 /* 1563 * There are pending frames. 1564 * The socket lock must be held while it's corked. 1565 */ 1566 lock_sock(sk); 1567 if (likely(up->pending)) { 1568 if (unlikely(up->pending != AF_INET6)) { 1569 release_sock(sk); 1570 return -EAFNOSUPPORT; 1571 } 1572 dst = NULL; 1573 goto do_append_data; 1574 } 1575 release_sock(sk); 1576 } 1577 ulen += sizeof(struct udphdr); 1578 1579 memset(fl6, 0, sizeof(*fl6)); 1580 1581 if (sin6) { 1582 if (sin6->sin6_port == 0) 1583 return -EINVAL; 1584 1585 fl6->fl6_dport = sin6->sin6_port; 1586 daddr = &sin6->sin6_addr; 1587 1588 if (inet6_test_bit(SNDFLOW, sk)) { 1589 fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1590 if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { 1591 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 1592 if (IS_ERR(flowlabel)) 1593 return -EINVAL; 1594 } 1595 } 1596 1597 /* 1598 * Otherwise it will be difficult to maintain 1599 * sk->sk_dst_cache. 1600 */ 1601 if (sk->sk_state == TCP_ESTABLISHED && 1602 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1603 daddr = &sk->sk_v6_daddr; 1604 1605 if (addr_len >= sizeof(struct sockaddr_in6) && 1606 sin6->sin6_scope_id && 1607 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1608 fl6->flowi6_oif = sin6->sin6_scope_id; 1609 } else { 1610 if (sk->sk_state != TCP_ESTABLISHED) 1611 return -EDESTADDRREQ; 1612 1613 fl6->fl6_dport = inet->inet_dport; 1614 daddr = &sk->sk_v6_daddr; 1615 fl6->flowlabel = np->flow_label; 1616 connected = true; 1617 } 1618 1619 if (!fl6->flowi6_oif) 1620 fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); 1621 1622 if (!fl6->flowi6_oif) 1623 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1624 1625 fl6->flowi6_uid = sk->sk_uid; 1626 1627 if (msg->msg_controllen) { 1628 opt = &opt_space; 1629 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1630 opt->tot_len = sizeof(*opt); 1631 ipc6.opt = opt; 1632 1633 err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 1634 if (err > 0) { 1635 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, 1636 &ipc6); 1637 connected = false; 1638 } 1639 if (err < 0) { 1640 fl6_sock_release(flowlabel); 1641 return err; 1642 } 1643 if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1644 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 1645 if (IS_ERR(flowlabel)) 1646 return -EINVAL; 1647 } 1648 if (!(opt->opt_nflen|opt->opt_flen)) 1649 opt = NULL; 1650 } 1651 if (!opt) { 1652 opt = txopt_get(np); 1653 opt_to_free = opt; 1654 } 1655 if (flowlabel) 1656 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1657 opt = ipv6_fixup_options(&opt_space, opt); 1658 ipc6.opt = opt; 1659 1660 fl6->flowi6_proto = sk->sk_protocol; 1661 fl6->flowi6_mark = ipc6.sockc.mark; 1662 fl6->daddr = *daddr; 1663 if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) 1664 fl6->saddr = np->saddr; 1665 fl6->fl6_sport = inet->inet_sport; 1666 1667 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { 1668 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 1669 (struct sockaddr *)sin6, 1670 &addr_len, 1671 &fl6->saddr); 1672 if (err) 1673 goto out_no_dst; 1674 if (sin6) { 1675 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 1676 /* BPF program rewrote IPv6-only by IPv4-mapped 1677 * IPv6. It's currently unsupported. 1678 */ 1679 err = -ENOTSUPP; 1680 goto out_no_dst; 1681 } 1682 if (sin6->sin6_port == 0) { 1683 /* BPF program set invalid port. Reject it. */ 1684 err = -EINVAL; 1685 goto out_no_dst; 1686 } 1687 fl6->fl6_dport = sin6->sin6_port; 1688 fl6->daddr = sin6->sin6_addr; 1689 } 1690 } 1691 1692 if (ipv6_addr_any(&fl6->daddr)) 1693 fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1694 1695 final_p = fl6_update_dst(fl6, opt, &final); 1696 if (final_p) 1697 connected = false; 1698 1699 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { 1700 fl6->flowi6_oif = READ_ONCE(np->mcast_oif); 1701 connected = false; 1702 } else if (!fl6->flowi6_oif) 1703 fl6->flowi6_oif = READ_ONCE(np->ucast_oif); 1704 1705 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 1706 1707 if (ipc6.tclass < 0) 1708 ipc6.tclass = np->tclass; 1709 1710 fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); 1711 1712 dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); 1713 if (IS_ERR(dst)) { 1714 err = PTR_ERR(dst); 1715 dst = NULL; 1716 goto out; 1717 } 1718 1719 if (ipc6.hlimit < 0) 1720 ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); 1721 1722 if (msg->msg_flags&MSG_CONFIRM) 1723 goto do_confirm; 1724 back_from_confirm: 1725 1726 /* Lockless fast path for the non-corking case */ 1727 if (!corkreq) { 1728 struct sk_buff *skb; 1729 1730 skb = ip6_make_skb(sk, getfrag, msg, ulen, 1731 sizeof(struct udphdr), &ipc6, 1732 dst_rt6_info(dst), 1733 msg->msg_flags, &cork); 1734 err = PTR_ERR(skb); 1735 if (!IS_ERR_OR_NULL(skb)) 1736 err = udp_v6_send_skb(skb, fl6, &cork.base); 1737 /* ip6_make_skb steals dst reference */ 1738 goto out_no_dst; 1739 } 1740 1741 lock_sock(sk); 1742 if (unlikely(up->pending)) { 1743 /* The socket is already corked while preparing it. */ 1744 /* ... which is an evident application bug. --ANK */ 1745 release_sock(sk); 1746 1747 net_dbg_ratelimited("udp cork app bug 2\n"); 1748 err = -EINVAL; 1749 goto out; 1750 } 1751 1752 WRITE_ONCE(up->pending, AF_INET6); 1753 1754 do_append_data: 1755 if (ipc6.dontfrag < 0) 1756 ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk); 1757 up->len += ulen; 1758 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 1759 &ipc6, fl6, dst_rt6_info(dst), 1760 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1761 if (err) 1762 udp_v6_flush_pending_frames(sk); 1763 else if (!corkreq) 1764 err = udp_v6_push_pending_frames(sk); 1765 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1766 WRITE_ONCE(up->pending, 0); 1767 1768 if (err > 0) 1769 err = inet6_test_bit(RECVERR6, sk) ? net_xmit_errno(err) : 0; 1770 release_sock(sk); 1771 1772 out: 1773 dst_release(dst); 1774 out_no_dst: 1775 fl6_sock_release(flowlabel); 1776 txopt_put(opt_to_free); 1777 if (!err) 1778 return len; 1779 /* 1780 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1781 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1782 * we don't have a good statistic (IpOutDiscards but it can be too many 1783 * things). We could add another new stat but at least for now that 1784 * seems like overkill. 1785 */ 1786 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1787 UDP6_INC_STATS(sock_net(sk), 1788 UDP_MIB_SNDBUFERRORS, is_udplite); 1789 } 1790 return err; 1791 1792 do_confirm: 1793 if (msg->msg_flags & MSG_PROBE) 1794 dst_confirm_neigh(dst, &fl6->daddr); 1795 if (!(msg->msg_flags&MSG_PROBE) || len) 1796 goto back_from_confirm; 1797 err = 0; 1798 goto out; 1799 } 1800 EXPORT_SYMBOL(udpv6_sendmsg); 1801 1802 static void udpv6_splice_eof(struct socket *sock) 1803 { 1804 struct sock *sk = sock->sk; 1805 struct udp_sock *up = udp_sk(sk); 1806 1807 if (!READ_ONCE(up->pending) || udp_test_bit(CORK, sk)) 1808 return; 1809 1810 lock_sock(sk); 1811 if (up->pending && !udp_test_bit(CORK, sk)) 1812 udp_v6_push_pending_frames(sk); 1813 release_sock(sk); 1814 } 1815 1816 void udpv6_destroy_sock(struct sock *sk) 1817 { 1818 struct udp_sock *up = udp_sk(sk); 1819 lock_sock(sk); 1820 1821 /* protects from races with udp_abort() */ 1822 sock_set_flag(sk, SOCK_DEAD); 1823 udp_v6_flush_pending_frames(sk); 1824 release_sock(sk); 1825 1826 if (static_branch_unlikely(&udpv6_encap_needed_key)) { 1827 if (up->encap_type) { 1828 void (*encap_destroy)(struct sock *sk); 1829 encap_destroy = READ_ONCE(up->encap_destroy); 1830 if (encap_destroy) 1831 encap_destroy(sk); 1832 } 1833 if (udp_test_bit(ENCAP_ENABLED, sk)) { 1834 static_branch_dec(&udpv6_encap_needed_key); 1835 udp_encap_disable(); 1836 } 1837 } 1838 } 1839 1840 /* 1841 * Socket option code for UDP 1842 */ 1843 int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1844 unsigned int optlen) 1845 { 1846 if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET) 1847 return udp_lib_setsockopt(sk, level, optname, 1848 optval, optlen, 1849 udp_v6_push_pending_frames); 1850 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1851 } 1852 1853 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1854 char __user *optval, int __user *optlen) 1855 { 1856 if (level == SOL_UDP || level == SOL_UDPLITE) 1857 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1858 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1859 } 1860 1861 1862 /* ------------------------------------------------------------------------ */ 1863 #ifdef CONFIG_PROC_FS 1864 int udp6_seq_show(struct seq_file *seq, void *v) 1865 { 1866 if (v == SEQ_START_TOKEN) { 1867 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1868 } else { 1869 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1870 const struct inet_sock *inet = inet_sk((const struct sock *)v); 1871 __u16 srcp = ntohs(inet->inet_sport); 1872 __u16 destp = ntohs(inet->inet_dport); 1873 __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 1874 udp_rqueue_get(v), bucket); 1875 } 1876 return 0; 1877 } 1878 1879 const struct seq_operations udp6_seq_ops = { 1880 .start = udp_seq_start, 1881 .next = udp_seq_next, 1882 .stop = udp_seq_stop, 1883 .show = udp6_seq_show, 1884 }; 1885 EXPORT_SYMBOL(udp6_seq_ops); 1886 1887 static struct udp_seq_afinfo udp6_seq_afinfo = { 1888 .family = AF_INET6, 1889 .udp_table = NULL, 1890 }; 1891 1892 int __net_init udp6_proc_init(struct net *net) 1893 { 1894 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1895 sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1896 return -ENOMEM; 1897 return 0; 1898 } 1899 1900 void udp6_proc_exit(struct net *net) 1901 { 1902 remove_proc_entry("udp6", net->proc_net); 1903 } 1904 #endif /* CONFIG_PROC_FS */ 1905 1906 /* ------------------------------------------------------------------------ */ 1907 1908 struct proto udpv6_prot = { 1909 .name = "UDPv6", 1910 .owner = THIS_MODULE, 1911 .close = udp_lib_close, 1912 .pre_connect = udpv6_pre_connect, 1913 .connect = udpv6_connect, 1914 .disconnect = udp_disconnect, 1915 .ioctl = udp_ioctl, 1916 .init = udpv6_init_sock, 1917 .destroy = udpv6_destroy_sock, 1918 .setsockopt = udpv6_setsockopt, 1919 .getsockopt = udpv6_getsockopt, 1920 .sendmsg = udpv6_sendmsg, 1921 .recvmsg = udpv6_recvmsg, 1922 .splice_eof = udpv6_splice_eof, 1923 .release_cb = ip6_datagram_release_cb, 1924 .hash = udp_lib_hash, 1925 .unhash = udp_lib_unhash, 1926 .rehash = udp_v6_rehash, 1927 .get_port = udp_v6_get_port, 1928 .put_port = udp_lib_unhash, 1929 #ifdef CONFIG_BPF_SYSCALL 1930 .psock_update_sk_prot = udp_bpf_update_proto, 1931 #endif 1932 1933 .memory_allocated = &udp_memory_allocated, 1934 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 1935 1936 .sysctl_mem = sysctl_udp_mem, 1937 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 1938 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1939 .obj_size = sizeof(struct udp6_sock), 1940 .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6), 1941 .h.udp_table = NULL, 1942 .diag_destroy = udp_abort, 1943 }; 1944 1945 static struct inet_protosw udpv6_protosw = { 1946 .type = SOCK_DGRAM, 1947 .protocol = IPPROTO_UDP, 1948 .prot = &udpv6_prot, 1949 .ops = &inet6_dgram_ops, 1950 .flags = INET_PROTOSW_PERMANENT, 1951 }; 1952 1953 int __init udpv6_init(void) 1954 { 1955 int ret; 1956 1957 net_hotdata.udpv6_protocol = (struct inet6_protocol) { 1958 .handler = udpv6_rcv, 1959 .err_handler = udpv6_err, 1960 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 1961 }; 1962 ret = inet6_add_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1963 if (ret) 1964 goto out; 1965 1966 ret = inet6_register_protosw(&udpv6_protosw); 1967 if (ret) 1968 goto out_udpv6_protocol; 1969 out: 1970 return ret; 1971 1972 out_udpv6_protocol: 1973 inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1974 goto out; 1975 } 1976 1977 void udpv6_exit(void) 1978 { 1979 inet6_unregister_protosw(&udpv6_protosw); 1980 inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1981 } 1982