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/udp_tunnel.h> 50 #include <net/xfrm.h> 51 #include <net/inet_hashtables.h> 52 #include <net/inet6_hashtables.h> 53 #include <net/busy_poll.h> 54 #include <net/sock_reuseport.h> 55 #include <net/gro.h> 56 57 #include <linux/proc_fs.h> 58 #include <linux/seq_file.h> 59 #include <trace/events/skb.h> 60 #include "udp_impl.h" 61 62 static void udpv6_destruct_sock(struct sock *sk) 63 { 64 udp_destruct_common(sk); 65 inet6_sock_destruct(sk); 66 } 67 68 int udpv6_init_sock(struct sock *sk) 69 { 70 udp_lib_init_sock(sk); 71 sk->sk_destruct = udpv6_destruct_sock; 72 set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags); 73 return 0; 74 } 75 76 INDIRECT_CALLABLE_SCOPE 77 u32 udp6_ehashfn(const struct net *net, 78 const struct in6_addr *laddr, 79 const u16 lport, 80 const struct in6_addr *faddr, 81 const __be16 fport) 82 { 83 u32 lhash, fhash; 84 85 net_get_random_once(&udp6_ehash_secret, 86 sizeof(udp6_ehash_secret)); 87 net_get_random_once(&udp_ipv6_hash_secret, 88 sizeof(udp_ipv6_hash_secret)); 89 90 lhash = (__force u32)laddr->s6_addr32[3]; 91 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 92 93 return __inet6_ehashfn(lhash, lport, fhash, fport, 94 udp6_ehash_secret + net_hash_mix(net)); 95 } 96 97 int udp_v6_get_port(struct sock *sk, unsigned short snum) 98 { 99 unsigned int hash2_nulladdr = 100 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 101 unsigned int hash2_partial = 102 ipv6_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, hash2_nulladdr); 107 } 108 109 void udp_v6_rehash(struct sock *sk) 110 { 111 u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 112 &sk->sk_v6_rcv_saddr, 113 inet_sk(sk)->inet_num); 114 u16 new_hash4; 115 116 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) { 117 new_hash4 = udp_ehashfn(sock_net(sk), 118 sk->sk_rcv_saddr, sk->sk_num, 119 sk->sk_daddr, sk->sk_dport); 120 } else { 121 new_hash4 = udp6_ehashfn(sock_net(sk), 122 &sk->sk_v6_rcv_saddr, sk->sk_num, 123 &sk->sk_v6_daddr, sk->sk_dport); 124 } 125 126 udp_lib_rehash(sk, new_hash, new_hash4); 127 } 128 129 static int compute_score(struct sock *sk, const struct net *net, 130 const struct in6_addr *saddr, __be16 sport, 131 const struct in6_addr *daddr, unsigned short hnum, 132 int dif, int sdif) 133 { 134 int bound_dev_if, score; 135 struct inet_sock *inet; 136 bool dev_match; 137 138 if (!net_eq(sock_net(sk), net) || 139 udp_sk(sk)->udp_port_hash != hnum || 140 sk->sk_family != PF_INET6) 141 return -1; 142 143 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 144 return -1; 145 146 score = 0; 147 inet = inet_sk(sk); 148 149 if (inet->inet_dport) { 150 if (inet->inet_dport != sport) 151 return -1; 152 score++; 153 } 154 155 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 156 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 157 return -1; 158 score++; 159 } 160 161 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 162 dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif); 163 if (!dev_match) 164 return -1; 165 if (bound_dev_if) 166 score++; 167 168 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) 169 score++; 170 171 return score; 172 } 173 174 /** 175 * udp6_lib_lookup1() - Simplified lookup using primary hash (destination port) 176 * @net: Network namespace 177 * @saddr: Source address, network order 178 * @sport: Source port, network order 179 * @daddr: Destination address, network order 180 * @hnum: Destination port, host order 181 * @dif: Destination interface index 182 * @sdif: Destination bridge port index, if relevant 183 * @udptable: Set of UDP hash tables 184 * 185 * Simplified lookup to be used as fallback if no sockets are found due to a 186 * potential race between (receive) address change, and lookup happening before 187 * the rehash operation. This function ignores SO_REUSEPORT groups while scoring 188 * result sockets, because if we have one, we don't need the fallback at all. 189 * 190 * Called under rcu_read_lock(). 191 * 192 * Return: socket with highest matching score if any, NULL if none 193 */ 194 static struct sock *udp6_lib_lookup1(const struct net *net, 195 const struct in6_addr *saddr, __be16 sport, 196 const struct in6_addr *daddr, 197 unsigned int hnum, int dif, int sdif, 198 const struct udp_table *udptable) 199 { 200 unsigned int slot = udp_hashfn(net, hnum, udptable->mask); 201 struct udp_hslot *hslot = &udptable->hash[slot]; 202 struct sock *sk, *result = NULL; 203 int score, badness = 0; 204 205 sk_for_each_rcu(sk, &hslot->head) { 206 score = compute_score(sk, net, 207 saddr, sport, daddr, hnum, dif, sdif); 208 if (score > badness) { 209 result = sk; 210 badness = score; 211 } 212 } 213 214 return result; 215 } 216 217 /* called with rcu_read_lock() */ 218 static struct sock *udp6_lib_lookup2(const struct net *net, 219 const struct in6_addr *saddr, __be16 sport, 220 const struct in6_addr *daddr, unsigned int hnum, 221 int dif, int sdif, struct udp_hslot *hslot2, 222 struct sk_buff *skb) 223 { 224 struct sock *sk, *result; 225 int score, badness; 226 bool need_rescore; 227 228 result = NULL; 229 badness = -1; 230 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 231 need_rescore = false; 232 rescore: 233 score = compute_score(need_rescore ? result : sk, net, saddr, 234 sport, daddr, hnum, dif, sdif); 235 if (score > badness) { 236 badness = score; 237 238 if (need_rescore) 239 continue; 240 241 if (sk->sk_state == TCP_ESTABLISHED) { 242 result = sk; 243 continue; 244 } 245 246 result = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr), 247 saddr, sport, daddr, hnum, udp6_ehashfn); 248 if (!result) { 249 result = sk; 250 continue; 251 } 252 253 /* Fall back to scoring if group has connections */ 254 if (!reuseport_has_conns(sk)) 255 return result; 256 257 /* Reuseport logic returned an error, keep original score. */ 258 if (IS_ERR(result)) 259 continue; 260 261 /* compute_score is too long of a function to be 262 * inlined, and calling it again here yields 263 * measureable overhead for some 264 * workloads. Work around it by jumping 265 * backwards to rescore 'result'. 266 */ 267 need_rescore = true; 268 goto rescore; 269 } 270 } 271 return result; 272 } 273 274 #if IS_ENABLED(CONFIG_BASE_SMALL) 275 static struct sock *udp6_lib_lookup4(const struct net *net, 276 const struct in6_addr *saddr, __be16 sport, 277 const struct in6_addr *daddr, 278 unsigned int hnum, int dif, int sdif, 279 struct udp_table *udptable) 280 { 281 return NULL; 282 } 283 284 static void udp6_hash4(struct sock *sk) 285 { 286 } 287 #else /* !CONFIG_BASE_SMALL */ 288 static struct sock *udp6_lib_lookup4(const struct net *net, 289 const struct in6_addr *saddr, __be16 sport, 290 const struct in6_addr *daddr, 291 unsigned int hnum, int dif, int sdif, 292 struct udp_table *udptable) 293 { 294 const __portpair ports = INET_COMBINED_PORTS(sport, hnum); 295 const struct hlist_nulls_node *node; 296 struct udp_hslot *hslot4; 297 unsigned int hash4, slot; 298 struct udp_sock *up; 299 struct sock *sk; 300 301 hash4 = udp6_ehashfn(net, daddr, hnum, saddr, sport); 302 slot = hash4 & udptable->mask; 303 hslot4 = &udptable->hash4[slot]; 304 305 begin: 306 udp_lrpa_for_each_entry_rcu(up, node, &hslot4->nulls_head) { 307 sk = (struct sock *)up; 308 if (inet6_match(net, sk, saddr, daddr, ports, dif, sdif)) 309 return sk; 310 } 311 312 /* if the nulls value we got at the end of this lookup is not the 313 * expected one, we must restart lookup. We probably met an item that 314 * was moved to another chain due to rehash. 315 */ 316 if (get_nulls_value(node) != slot) 317 goto begin; 318 319 return NULL; 320 } 321 322 static void udp6_hash4(struct sock *sk) 323 { 324 struct net *net = sock_net(sk); 325 unsigned int hash; 326 327 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) { 328 udp4_hash4(sk); 329 return; 330 } 331 332 if (sk_unhashed(sk) || ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 333 return; 334 335 hash = udp6_ehashfn(net, &sk->sk_v6_rcv_saddr, sk->sk_num, 336 &sk->sk_v6_daddr, sk->sk_dport); 337 338 udp_lib_hash4(sk, hash); 339 } 340 #endif /* CONFIG_BASE_SMALL */ 341 342 /* rcu_read_lock() must be held */ 343 struct sock *__udp6_lib_lookup(const struct net *net, 344 const struct in6_addr *saddr, __be16 sport, 345 const struct in6_addr *daddr, __be16 dport, 346 int dif, int sdif, struct udp_table *udptable, 347 struct sk_buff *skb) 348 { 349 unsigned short hnum = ntohs(dport); 350 struct udp_hslot *hslot2; 351 struct sock *result, *sk; 352 unsigned int hash2; 353 354 hash2 = ipv6_portaddr_hash(net, daddr, hnum); 355 hslot2 = udp_hashslot2(udptable, hash2); 356 357 if (udp_has_hash4(hslot2)) { 358 result = udp6_lib_lookup4(net, saddr, sport, daddr, hnum, 359 dif, sdif, udptable); 360 if (result) /* udp6_lib_lookup4 return sk or NULL */ 361 return result; 362 } 363 364 /* Lookup connected or non-wildcard sockets */ 365 result = udp6_lib_lookup2(net, saddr, sport, 366 daddr, hnum, dif, sdif, 367 hslot2, skb); 368 if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) 369 goto done; 370 371 /* Lookup redirect from BPF */ 372 if (static_branch_unlikely(&bpf_sk_lookup_enabled) && 373 udptable == net->ipv4.udp_table) { 374 sk = inet6_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr), 375 saddr, sport, daddr, hnum, dif, 376 udp6_ehashfn); 377 if (sk) { 378 result = sk; 379 goto done; 380 } 381 } 382 383 /* Got non-wildcard socket or error on first lookup */ 384 if (result) 385 goto done; 386 387 /* Lookup wildcard sockets */ 388 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 389 hslot2 = udp_hashslot2(udptable, hash2); 390 391 result = udp6_lib_lookup2(net, saddr, sport, 392 &in6addr_any, hnum, dif, sdif, 393 hslot2, skb); 394 if (!IS_ERR_OR_NULL(result)) 395 goto done; 396 397 /* Cover address change/lookup/rehash race: see __udp4_lib_lookup() */ 398 result = udp6_lib_lookup1(net, saddr, sport, daddr, hnum, dif, sdif, 399 udptable); 400 401 done: 402 if (IS_ERR(result)) 403 return NULL; 404 return result; 405 } 406 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 407 408 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 409 __be16 sport, __be16 dport, 410 struct udp_table *udptable) 411 { 412 const struct ipv6hdr *iph = ipv6_hdr(skb); 413 414 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 415 &iph->daddr, dport, inet6_iif(skb), 416 inet6_sdif(skb), udptable, skb); 417 } 418 419 struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, 420 __be16 sport, __be16 dport) 421 { 422 const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation]; 423 const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset); 424 struct net *net = dev_net(skb->dev); 425 int iif, sdif; 426 427 inet6_get_iif_sdif(skb, &iif, &sdif); 428 429 return __udp6_lib_lookup(net, &iph->saddr, sport, 430 &iph->daddr, dport, iif, 431 sdif, net->ipv4.udp_table, NULL); 432 } 433 434 /* Must be called under rcu_read_lock(). 435 * Does increment socket refcount. 436 */ 437 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 438 struct sock *udp6_lib_lookup(const struct net *net, const struct in6_addr *saddr, __be16 sport, 439 const struct in6_addr *daddr, __be16 dport, int dif) 440 { 441 struct sock *sk; 442 443 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 444 dif, 0, net->ipv4.udp_table, NULL); 445 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 446 sk = NULL; 447 return sk; 448 } 449 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 450 #endif 451 452 /* do not use the scratch area len for jumbogram: their length execeeds the 453 * scratch area space; note that the IP6CB flags is still in the first 454 * cacheline, so checking for jumbograms is cheap 455 */ 456 static int udp6_skb_len(struct sk_buff *skb) 457 { 458 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 459 } 460 461 /* 462 * This should be easy, if there is something there we 463 * return it, otherwise we block. 464 */ 465 466 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 467 int flags, int *addr_len) 468 { 469 struct ipv6_pinfo *np = inet6_sk(sk); 470 struct inet_sock *inet = inet_sk(sk); 471 struct sk_buff *skb; 472 unsigned int ulen, copied; 473 int off, err, peeking = flags & MSG_PEEK; 474 int is_udplite = IS_UDPLITE(sk); 475 struct udp_mib __percpu *mib; 476 bool checksum_valid = false; 477 int is_udp4; 478 479 if (flags & MSG_ERRQUEUE) 480 return ipv6_recv_error(sk, msg, len, addr_len); 481 482 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 483 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 484 485 try_again: 486 off = sk_peek_offset(sk, flags); 487 skb = __skb_recv_udp(sk, flags, &off, &err); 488 if (!skb) 489 return err; 490 491 ulen = udp6_skb_len(skb); 492 copied = len; 493 if (copied > ulen - off) 494 copied = ulen - off; 495 else if (copied < ulen) 496 msg->msg_flags |= MSG_TRUNC; 497 498 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 499 mib = __UDPX_MIB(sk, is_udp4); 500 501 /* 502 * If checksum is needed at all, try to do it while copying the 503 * data. If the data is truncated, or if we only want a partial 504 * coverage checksum (UDP-Lite), do it before the copy. 505 */ 506 507 if (copied < ulen || peeking || 508 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 509 checksum_valid = udp_skb_csum_unnecessary(skb) || 510 !__udp_lib_checksum_complete(skb); 511 if (!checksum_valid) 512 goto csum_copy_err; 513 } 514 515 if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 516 if (udp_skb_is_linear(skb)) 517 err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 518 else 519 err = skb_copy_datagram_msg(skb, off, msg, copied); 520 } else { 521 err = skb_copy_and_csum_datagram_msg(skb, off, msg); 522 if (err == -EINVAL) 523 goto csum_copy_err; 524 } 525 if (unlikely(err)) { 526 if (!peeking) { 527 atomic_inc(&sk->sk_drops); 528 SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 529 } 530 kfree_skb(skb); 531 return err; 532 } 533 if (!peeking) 534 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 535 536 sock_recv_cmsgs(msg, sk, skb); 537 538 /* Copy the address. */ 539 if (msg->msg_name) { 540 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 541 sin6->sin6_family = AF_INET6; 542 sin6->sin6_port = udp_hdr(skb)->source; 543 sin6->sin6_flowinfo = 0; 544 545 if (is_udp4) { 546 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 547 &sin6->sin6_addr); 548 sin6->sin6_scope_id = 0; 549 } else { 550 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 551 sin6->sin6_scope_id = 552 ipv6_iface_scope_id(&sin6->sin6_addr, 553 inet6_iif(skb)); 554 } 555 *addr_len = sizeof(*sin6); 556 557 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, 558 (struct sockaddr *)sin6, 559 addr_len); 560 } 561 562 if (udp_test_bit(GRO_ENABLED, sk)) 563 udp_cmsg_recv(msg, sk, skb); 564 565 if (np->rxopt.all) 566 ip6_datagram_recv_common_ctl(sk, msg, skb); 567 568 if (is_udp4) { 569 if (inet_cmsg_flags(inet)) 570 ip_cmsg_recv_offset(msg, sk, skb, 571 sizeof(struct udphdr), off); 572 } else { 573 if (np->rxopt.all) 574 ip6_datagram_recv_specific_ctl(sk, msg, skb); 575 } 576 577 err = copied; 578 if (flags & MSG_TRUNC) 579 err = ulen; 580 581 skb_consume_udp(sk, skb, peeking ? -err : err); 582 return err; 583 584 csum_copy_err: 585 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 586 udp_skb_destructor)) { 587 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 588 SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 589 } 590 kfree_skb_reason(skb, SKB_DROP_REASON_UDP_CSUM); 591 592 /* starting over for a new packet, but check if we need to yield */ 593 cond_resched(); 594 msg->msg_flags &= ~MSG_TRUNC; 595 goto try_again; 596 } 597 598 DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 599 void udpv6_encap_enable(void) 600 { 601 static_branch_inc(&udpv6_encap_needed_key); 602 } 603 EXPORT_SYMBOL(udpv6_encap_enable); 604 605 /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 606 * through error handlers in encapsulations looking for a match. 607 */ 608 static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 609 struct inet6_skb_parm *opt, 610 u8 type, u8 code, int offset, __be32 info) 611 { 612 int i; 613 614 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 615 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 616 u8 type, u8 code, int offset, __be32 info); 617 const struct ip6_tnl_encap_ops *encap; 618 619 encap = rcu_dereference(ip6tun_encaps[i]); 620 if (!encap) 621 continue; 622 handler = encap->err_handler; 623 if (handler && !handler(skb, opt, type, code, offset, info)) 624 return 0; 625 } 626 627 return -ENOENT; 628 } 629 630 /* Try to match ICMP errors to UDP tunnels by looking up a socket without 631 * reversing source and destination port: this will match tunnels that force the 632 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 633 * lwtunnels might actually break this assumption by being configured with 634 * different destination ports on endpoints, in this case we won't be able to 635 * trace ICMP messages back to them. 636 * 637 * If this doesn't match any socket, probe tunnels with arbitrary destination 638 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 639 * we've sent packets to won't necessarily match the local destination port. 640 * 641 * Then ask the tunnel implementation to match the error against a valid 642 * association. 643 * 644 * Return an error if we can't find a match, the socket if we need further 645 * processing, zero otherwise. 646 */ 647 static struct sock *__udp6_lib_err_encap(struct net *net, 648 const struct ipv6hdr *hdr, int offset, 649 struct udphdr *uh, 650 struct udp_table *udptable, 651 struct sock *sk, 652 struct sk_buff *skb, 653 struct inet6_skb_parm *opt, 654 u8 type, u8 code, __be32 info) 655 { 656 int (*lookup)(struct sock *sk, struct sk_buff *skb); 657 int network_offset, transport_offset; 658 struct udp_sock *up; 659 660 network_offset = skb_network_offset(skb); 661 transport_offset = skb_transport_offset(skb); 662 663 /* Network header needs to point to the outer IPv6 header inside ICMP */ 664 skb_reset_network_header(skb); 665 666 /* Transport header needs to point to the UDP header */ 667 skb_set_transport_header(skb, offset); 668 669 if (sk) { 670 up = udp_sk(sk); 671 672 lookup = READ_ONCE(up->encap_err_lookup); 673 if (lookup && lookup(sk, skb)) 674 sk = NULL; 675 676 goto out; 677 } 678 679 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 680 &hdr->saddr, uh->dest, 681 inet6_iif(skb), 0, udptable, skb); 682 if (sk) { 683 up = udp_sk(sk); 684 685 lookup = READ_ONCE(up->encap_err_lookup); 686 if (!lookup || lookup(sk, skb)) 687 sk = NULL; 688 } 689 690 out: 691 if (!sk) { 692 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 693 offset, info)); 694 } 695 696 skb_set_transport_header(skb, transport_offset); 697 skb_set_network_header(skb, network_offset); 698 699 return sk; 700 } 701 702 int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 703 u8 type, u8 code, int offset, __be32 info, 704 struct udp_table *udptable) 705 { 706 struct ipv6_pinfo *np; 707 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 708 const struct in6_addr *saddr = &hdr->saddr; 709 const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; 710 struct udphdr *uh = (struct udphdr *)(skb->data+offset); 711 bool tunnel = false; 712 struct sock *sk; 713 int harderr; 714 int err; 715 struct net *net = dev_net(skb->dev); 716 717 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 718 inet6_iif(skb), inet6_sdif(skb), udptable, NULL); 719 720 if (!sk || READ_ONCE(udp_sk(sk)->encap_type)) { 721 /* No socket for error: try tunnels before discarding */ 722 if (static_branch_unlikely(&udpv6_encap_needed_key)) { 723 sk = __udp6_lib_err_encap(net, hdr, offset, uh, 724 udptable, sk, skb, 725 opt, type, code, info); 726 if (!sk) 727 return 0; 728 } else 729 sk = ERR_PTR(-ENOENT); 730 731 if (IS_ERR(sk)) { 732 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 733 ICMP6_MIB_INERRORS); 734 return PTR_ERR(sk); 735 } 736 737 tunnel = true; 738 } 739 740 harderr = icmpv6_err_convert(type, code, &err); 741 np = inet6_sk(sk); 742 743 if (type == ICMPV6_PKT_TOOBIG) { 744 if (!ip6_sk_accept_pmtu(sk)) 745 goto out; 746 ip6_sk_update_pmtu(skb, sk, info); 747 if (READ_ONCE(np->pmtudisc) != IPV6_PMTUDISC_DONT) 748 harderr = 1; 749 } 750 if (type == NDISC_REDIRECT) { 751 if (tunnel) { 752 ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 753 READ_ONCE(sk->sk_mark), sk->sk_uid); 754 } else { 755 ip6_sk_redirect(skb, sk); 756 } 757 goto out; 758 } 759 760 /* Tunnels don't have an application socket: don't pass errors back */ 761 if (tunnel) { 762 if (udp_sk(sk)->encap_err_rcv) 763 udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest, 764 ntohl(info), (u8 *)(uh+1)); 765 goto out; 766 } 767 768 if (!inet6_test_bit(RECVERR6, sk)) { 769 if (!harderr || sk->sk_state != TCP_ESTABLISHED) 770 goto out; 771 } else { 772 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 773 } 774 775 sk->sk_err = err; 776 sk_error_report(sk); 777 out: 778 return 0; 779 } 780 781 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 782 { 783 int rc; 784 785 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 786 sock_rps_save_rxhash(sk, skb); 787 sk_mark_napi_id(sk, skb); 788 sk_incoming_cpu_update(sk); 789 } else { 790 sk_mark_napi_id_once(sk, skb); 791 } 792 793 rc = __udp_enqueue_schedule_skb(sk, skb); 794 if (rc < 0) { 795 int is_udplite = IS_UDPLITE(sk); 796 enum skb_drop_reason drop_reason; 797 798 /* Note that an ENOMEM error is charged twice */ 799 if (rc == -ENOMEM) { 800 UDP6_INC_STATS(sock_net(sk), 801 UDP_MIB_RCVBUFERRORS, is_udplite); 802 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; 803 } else { 804 UDP6_INC_STATS(sock_net(sk), 805 UDP_MIB_MEMERRORS, is_udplite); 806 drop_reason = SKB_DROP_REASON_PROTO_MEM; 807 } 808 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 809 trace_udp_fail_queue_rcv_skb(rc, sk, skb); 810 sk_skb_reason_drop(sk, skb, drop_reason); 811 return -1; 812 } 813 814 return 0; 815 } 816 817 static __inline__ int udpv6_err(struct sk_buff *skb, 818 struct inet6_skb_parm *opt, u8 type, 819 u8 code, int offset, __be32 info) 820 { 821 return __udp6_lib_err(skb, opt, type, code, offset, info, 822 dev_net(skb->dev)->ipv4.udp_table); 823 } 824 825 static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 826 { 827 enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; 828 struct udp_sock *up = udp_sk(sk); 829 int is_udplite = IS_UDPLITE(sk); 830 831 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 832 drop_reason = SKB_DROP_REASON_XFRM_POLICY; 833 goto drop; 834 } 835 nf_reset_ct(skb); 836 837 if (static_branch_unlikely(&udpv6_encap_needed_key) && 838 READ_ONCE(up->encap_type)) { 839 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 840 841 /* 842 * This is an encapsulation socket so pass the skb to 843 * the socket's udp_encap_rcv() hook. Otherwise, just 844 * fall through and pass this up the UDP socket. 845 * up->encap_rcv() returns the following value: 846 * =0 if skb was successfully passed to the encap 847 * handler or was discarded by it. 848 * >0 if skb should be passed on to UDP. 849 * <0 if skb should be resubmitted as proto -N 850 */ 851 852 /* if we're overly short, let UDP handle it */ 853 encap_rcv = READ_ONCE(up->encap_rcv); 854 if (encap_rcv) { 855 int ret; 856 857 /* Verify checksum before giving to encap */ 858 if (udp_lib_checksum_complete(skb)) 859 goto csum_error; 860 861 ret = encap_rcv(sk, skb); 862 if (ret <= 0) { 863 __UDP6_INC_STATS(sock_net(sk), 864 UDP_MIB_INDATAGRAMS, 865 is_udplite); 866 return -ret; 867 } 868 } 869 870 /* FALLTHROUGH -- it's a UDP Packet */ 871 } 872 873 /* 874 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 875 */ 876 if (udp_test_bit(UDPLITE_RECV_CC, sk) && UDP_SKB_CB(skb)->partial_cov) { 877 u16 pcrlen = READ_ONCE(up->pcrlen); 878 879 if (pcrlen == 0) { /* full coverage was set */ 880 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 881 UDP_SKB_CB(skb)->cscov, skb->len); 882 goto drop; 883 } 884 if (UDP_SKB_CB(skb)->cscov < pcrlen) { 885 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 886 UDP_SKB_CB(skb)->cscov, pcrlen); 887 goto drop; 888 } 889 } 890 891 prefetch(&sk->sk_rmem_alloc); 892 if (rcu_access_pointer(sk->sk_filter) && 893 udp_lib_checksum_complete(skb)) 894 goto csum_error; 895 896 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) { 897 drop_reason = SKB_DROP_REASON_SOCKET_FILTER; 898 goto drop; 899 } 900 901 udp_csum_pull_header(skb); 902 903 skb_dst_drop(skb); 904 905 return __udpv6_queue_rcv_skb(sk, skb); 906 907 csum_error: 908 drop_reason = SKB_DROP_REASON_UDP_CSUM; 909 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 910 drop: 911 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 912 atomic_inc(&sk->sk_drops); 913 sk_skb_reason_drop(sk, skb, drop_reason); 914 return -1; 915 } 916 917 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 918 { 919 struct sk_buff *next, *segs; 920 int ret; 921 922 if (likely(!udp_unexpected_gso(sk, skb))) 923 return udpv6_queue_rcv_one_skb(sk, skb); 924 925 __skb_push(skb, -skb_mac_offset(skb)); 926 segs = udp_rcv_segment(sk, skb, false); 927 skb_list_walk_safe(segs, skb, next) { 928 __skb_pull(skb, skb_transport_offset(skb)); 929 930 udp_post_segment_fix_csum(skb); 931 ret = udpv6_queue_rcv_one_skb(sk, skb); 932 if (ret > 0) 933 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, 934 true); 935 } 936 return 0; 937 } 938 939 static bool __udp_v6_is_mcast_sock(struct net *net, const struct sock *sk, 940 __be16 loc_port, const struct in6_addr *loc_addr, 941 __be16 rmt_port, const struct in6_addr *rmt_addr, 942 int dif, int sdif, unsigned short hnum) 943 { 944 const struct inet_sock *inet = inet_sk(sk); 945 946 if (!net_eq(sock_net(sk), net)) 947 return false; 948 949 if (udp_sk(sk)->udp_port_hash != hnum || 950 sk->sk_family != PF_INET6 || 951 (inet->inet_dport && inet->inet_dport != rmt_port) || 952 (!ipv6_addr_any(&sk->sk_v6_daddr) && 953 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 954 !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) || 955 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 956 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 957 return false; 958 if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 959 return false; 960 return true; 961 } 962 963 static void udp6_csum_zero_error(struct sk_buff *skb) 964 { 965 /* RFC 2460 section 8.1 says that we SHOULD log 966 * this error. Well, it is reasonable. 967 */ 968 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 969 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 970 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 971 } 972 973 /* 974 * Note: called only from the BH handler context, 975 * so we don't need to lock the hashes. 976 */ 977 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 978 const struct in6_addr *saddr, const struct in6_addr *daddr, 979 struct udp_table *udptable, int proto) 980 { 981 struct sock *sk, *first = NULL; 982 const struct udphdr *uh = udp_hdr(skb); 983 unsigned short hnum = ntohs(uh->dest); 984 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 985 unsigned int offset = offsetof(typeof(*sk), sk_node); 986 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 987 int dif = inet6_iif(skb); 988 int sdif = inet6_sdif(skb); 989 struct hlist_node *node; 990 struct sk_buff *nskb; 991 992 if (use_hash2) { 993 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & 994 udptable->mask; 995 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; 996 start_lookup: 997 hslot = &udptable->hash2[hash2].hslot; 998 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 999 } 1000 1001 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 1002 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 1003 uh->source, saddr, dif, sdif, 1004 hnum)) 1005 continue; 1006 /* If zero checksum and no_check is not on for 1007 * the socket then skip it. 1008 */ 1009 if (!uh->check && !udp_get_no_check6_rx(sk)) 1010 continue; 1011 if (!first) { 1012 first = sk; 1013 continue; 1014 } 1015 nskb = skb_clone(skb, GFP_ATOMIC); 1016 if (unlikely(!nskb)) { 1017 atomic_inc(&sk->sk_drops); 1018 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 1019 IS_UDPLITE(sk)); 1020 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 1021 IS_UDPLITE(sk)); 1022 continue; 1023 } 1024 1025 if (udpv6_queue_rcv_skb(sk, nskb) > 0) 1026 consume_skb(nskb); 1027 } 1028 1029 /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 1030 if (use_hash2 && hash2 != hash2_any) { 1031 hash2 = hash2_any; 1032 goto start_lookup; 1033 } 1034 1035 if (first) { 1036 if (udpv6_queue_rcv_skb(first, skb) > 0) 1037 consume_skb(skb); 1038 } else { 1039 kfree_skb(skb); 1040 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 1041 proto == IPPROTO_UDPLITE); 1042 } 1043 return 0; 1044 } 1045 1046 static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) 1047 { 1048 if (udp_sk_rx_dst_set(sk, dst)) 1049 sk->sk_rx_dst_cookie = rt6_get_cookie(dst_rt6_info(dst)); 1050 } 1051 1052 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and 1053 * return code conversion for ip layer consumption 1054 */ 1055 static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, 1056 struct udphdr *uh) 1057 { 1058 int ret; 1059 1060 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 1061 skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); 1062 1063 ret = udpv6_queue_rcv_skb(sk, skb); 1064 1065 /* a return value > 0 means to resubmit the input */ 1066 if (ret > 0) 1067 return ret; 1068 return 0; 1069 } 1070 1071 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 1072 int proto) 1073 { 1074 enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; 1075 const struct in6_addr *saddr, *daddr; 1076 struct net *net = dev_net(skb->dev); 1077 struct sock *sk = NULL; 1078 struct udphdr *uh; 1079 bool refcounted; 1080 u32 ulen = 0; 1081 1082 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 1083 goto discard; 1084 1085 saddr = &ipv6_hdr(skb)->saddr; 1086 daddr = &ipv6_hdr(skb)->daddr; 1087 uh = udp_hdr(skb); 1088 1089 ulen = ntohs(uh->len); 1090 if (ulen > skb->len) 1091 goto short_packet; 1092 1093 if (proto == IPPROTO_UDP) { 1094 /* UDP validates ulen. */ 1095 1096 /* Check for jumbo payload */ 1097 if (ulen == 0) 1098 ulen = skb->len; 1099 1100 if (ulen < sizeof(*uh)) 1101 goto short_packet; 1102 1103 if (ulen < skb->len) { 1104 if (pskb_trim_rcsum(skb, ulen)) 1105 goto short_packet; 1106 saddr = &ipv6_hdr(skb)->saddr; 1107 daddr = &ipv6_hdr(skb)->daddr; 1108 uh = udp_hdr(skb); 1109 } 1110 } 1111 1112 if (udp6_csum_init(skb, uh, proto)) 1113 goto csum_error; 1114 1115 /* Check if the socket is already available, e.g. due to early demux */ 1116 sk = inet6_steal_sock(net, skb, sizeof(struct udphdr), saddr, uh->source, daddr, uh->dest, 1117 &refcounted, udp6_ehashfn); 1118 if (IS_ERR(sk)) 1119 goto no_sk; 1120 1121 if (sk) { 1122 struct dst_entry *dst = skb_dst(skb); 1123 int ret; 1124 1125 if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst)) 1126 udp6_sk_rx_dst_set(sk, dst); 1127 1128 if (!uh->check && !udp_get_no_check6_rx(sk)) { 1129 if (refcounted) 1130 sock_put(sk); 1131 goto report_csum_error; 1132 } 1133 1134 ret = udp6_unicast_rcv_skb(sk, skb, uh); 1135 if (refcounted) 1136 sock_put(sk); 1137 return ret; 1138 } 1139 1140 /* 1141 * Multicast receive code 1142 */ 1143 if (ipv6_addr_is_multicast(daddr)) 1144 return __udp6_lib_mcast_deliver(net, skb, 1145 saddr, daddr, udptable, proto); 1146 1147 /* Unicast */ 1148 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 1149 if (sk) { 1150 if (!uh->check && !udp_get_no_check6_rx(sk)) 1151 goto report_csum_error; 1152 return udp6_unicast_rcv_skb(sk, skb, uh); 1153 } 1154 no_sk: 1155 reason = SKB_DROP_REASON_NO_SOCKET; 1156 1157 if (!uh->check) 1158 goto report_csum_error; 1159 1160 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 1161 goto discard; 1162 nf_reset_ct(skb); 1163 1164 if (udp_lib_checksum_complete(skb)) 1165 goto csum_error; 1166 1167 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 1168 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 1169 1170 sk_skb_reason_drop(sk, skb, reason); 1171 return 0; 1172 1173 short_packet: 1174 if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 1175 reason = SKB_DROP_REASON_PKT_TOO_SMALL; 1176 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 1177 proto == IPPROTO_UDPLITE ? "-Lite" : "", 1178 saddr, ntohs(uh->source), 1179 ulen, skb->len, 1180 daddr, ntohs(uh->dest)); 1181 goto discard; 1182 1183 report_csum_error: 1184 udp6_csum_zero_error(skb); 1185 csum_error: 1186 if (reason == SKB_DROP_REASON_NOT_SPECIFIED) 1187 reason = SKB_DROP_REASON_UDP_CSUM; 1188 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 1189 discard: 1190 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 1191 sk_skb_reason_drop(sk, skb, reason); 1192 return 0; 1193 } 1194 1195 1196 static struct sock *__udp6_lib_demux_lookup(struct net *net, 1197 __be16 loc_port, const struct in6_addr *loc_addr, 1198 __be16 rmt_port, const struct in6_addr *rmt_addr, 1199 int dif, int sdif) 1200 { 1201 struct udp_table *udptable = net->ipv4.udp_table; 1202 unsigned short hnum = ntohs(loc_port); 1203 struct udp_hslot *hslot2; 1204 unsigned int hash2; 1205 __portpair ports; 1206 struct sock *sk; 1207 1208 hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); 1209 hslot2 = udp_hashslot2(udptable, hash2); 1210 ports = INET_COMBINED_PORTS(rmt_port, hnum); 1211 1212 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 1213 if (sk->sk_state == TCP_ESTABLISHED && 1214 inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif)) 1215 return sk; 1216 /* Only check first socket in chain */ 1217 break; 1218 } 1219 return NULL; 1220 } 1221 1222 void udp_v6_early_demux(struct sk_buff *skb) 1223 { 1224 struct net *net = dev_net(skb->dev); 1225 const struct udphdr *uh; 1226 struct sock *sk; 1227 struct dst_entry *dst; 1228 int dif = skb->dev->ifindex; 1229 int sdif = inet6_sdif(skb); 1230 1231 if (!pskb_may_pull(skb, skb_transport_offset(skb) + 1232 sizeof(struct udphdr))) 1233 return; 1234 1235 uh = udp_hdr(skb); 1236 1237 if (skb->pkt_type == PACKET_HOST) 1238 sk = __udp6_lib_demux_lookup(net, uh->dest, 1239 &ipv6_hdr(skb)->daddr, 1240 uh->source, &ipv6_hdr(skb)->saddr, 1241 dif, sdif); 1242 else 1243 return; 1244 1245 if (!sk) 1246 return; 1247 1248 skb->sk = sk; 1249 DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk)); 1250 skb->destructor = sock_pfree; 1251 dst = rcu_dereference(sk->sk_rx_dst); 1252 1253 if (dst) 1254 dst = dst_check(dst, sk->sk_rx_dst_cookie); 1255 if (dst) { 1256 /* set noref for now. 1257 * any place which wants to hold dst has to call 1258 * dst_hold_safe() 1259 */ 1260 skb_dst_set_noref(skb, dst); 1261 } 1262 } 1263 1264 INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) 1265 { 1266 return __udp6_lib_rcv(skb, dev_net(skb->dev)->ipv4.udp_table, IPPROTO_UDP); 1267 } 1268 1269 /* 1270 * Throw away all pending data and cancel the corking. Socket is locked. 1271 */ 1272 static void udp_v6_flush_pending_frames(struct sock *sk) 1273 { 1274 struct udp_sock *up = udp_sk(sk); 1275 1276 if (up->pending == AF_INET) 1277 udp_flush_pending_frames(sk); 1278 else if (up->pending) { 1279 up->len = 0; 1280 WRITE_ONCE(up->pending, 0); 1281 ip6_flush_pending_frames(sk); 1282 } 1283 } 1284 1285 static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 1286 int addr_len) 1287 { 1288 if (addr_len < offsetofend(struct sockaddr, sa_family)) 1289 return -EINVAL; 1290 /* The following checks are replicated from __ip6_datagram_connect() 1291 * and intended to prevent BPF program called below from accessing 1292 * bytes that are out of the bound specified by user in addr_len. 1293 */ 1294 if (uaddr->sa_family == AF_INET) { 1295 if (ipv6_only_sock(sk)) 1296 return -EAFNOSUPPORT; 1297 return udp_pre_connect(sk, uaddr, addr_len); 1298 } 1299 1300 if (addr_len < SIN6_LEN_RFC2133) 1301 return -EINVAL; 1302 1303 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr, &addr_len); 1304 } 1305 1306 static int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 1307 { 1308 int res; 1309 1310 lock_sock(sk); 1311 res = __ip6_datagram_connect(sk, uaddr, addr_len); 1312 if (!res) 1313 udp6_hash4(sk); 1314 release_sock(sk); 1315 return res; 1316 } 1317 1318 /** 1319 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1320 * @sk: socket we are sending on 1321 * @skb: sk_buff containing the filled-in UDP header 1322 * (checksum field must be zeroed out) 1323 * @saddr: source address 1324 * @daddr: destination address 1325 * @len: length of packet 1326 */ 1327 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1328 const struct in6_addr *saddr, 1329 const struct in6_addr *daddr, int len) 1330 { 1331 unsigned int offset; 1332 struct udphdr *uh = udp_hdr(skb); 1333 struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1334 __wsum csum = 0; 1335 1336 if (!frags) { 1337 /* Only one fragment on the socket. */ 1338 skb->csum_start = skb_transport_header(skb) - skb->head; 1339 skb->csum_offset = offsetof(struct udphdr, check); 1340 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1341 } else { 1342 /* 1343 * HW-checksum won't work as there are two or more 1344 * fragments on the socket so that all csums of sk_buffs 1345 * should be together 1346 */ 1347 offset = skb_transport_offset(skb); 1348 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 1349 csum = skb->csum; 1350 1351 skb->ip_summed = CHECKSUM_NONE; 1352 1353 do { 1354 csum = csum_add(csum, frags->csum); 1355 } while ((frags = frags->next)); 1356 1357 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1358 csum); 1359 if (uh->check == 0) 1360 uh->check = CSUM_MANGLED_0; 1361 } 1362 } 1363 1364 /* 1365 * Sending 1366 */ 1367 1368 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1369 struct inet_cork *cork) 1370 { 1371 struct sock *sk = skb->sk; 1372 struct udphdr *uh; 1373 int err = 0; 1374 int is_udplite = IS_UDPLITE(sk); 1375 __wsum csum = 0; 1376 int offset = skb_transport_offset(skb); 1377 int len = skb->len - offset; 1378 int datalen = len - sizeof(*uh); 1379 1380 /* 1381 * Create a UDP header 1382 */ 1383 uh = udp_hdr(skb); 1384 uh->source = fl6->fl6_sport; 1385 uh->dest = fl6->fl6_dport; 1386 uh->len = htons(len); 1387 uh->check = 0; 1388 1389 if (cork->gso_size) { 1390 const int hlen = skb_network_header_len(skb) + 1391 sizeof(struct udphdr); 1392 1393 if (hlen + min(datalen, cork->gso_size) > cork->fragsize) { 1394 kfree_skb(skb); 1395 return -EMSGSIZE; 1396 } 1397 if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { 1398 kfree_skb(skb); 1399 return -EINVAL; 1400 } 1401 if (udp_get_no_check6_tx(sk)) { 1402 kfree_skb(skb); 1403 return -EINVAL; 1404 } 1405 if (is_udplite || dst_xfrm(skb_dst(skb))) { 1406 kfree_skb(skb); 1407 return -EIO; 1408 } 1409 1410 if (datalen > cork->gso_size) { 1411 skb_shinfo(skb)->gso_size = cork->gso_size; 1412 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 1413 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, 1414 cork->gso_size); 1415 1416 /* Don't checksum the payload, skb will get segmented */ 1417 goto csum_partial; 1418 } 1419 } 1420 1421 if (is_udplite) 1422 csum = udplite_csum(skb); 1423 else if (udp_get_no_check6_tx(sk)) { /* UDP csum disabled */ 1424 skb->ip_summed = CHECKSUM_NONE; 1425 goto send; 1426 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1427 csum_partial: 1428 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1429 goto send; 1430 } else 1431 csum = udp_csum(skb); 1432 1433 /* add protocol-dependent pseudo-header */ 1434 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1435 len, fl6->flowi6_proto, csum); 1436 if (uh->check == 0) 1437 uh->check = CSUM_MANGLED_0; 1438 1439 send: 1440 err = ip6_send_skb(skb); 1441 if (err) { 1442 if (err == -ENOBUFS && !inet6_test_bit(RECVERR6, sk)) { 1443 UDP6_INC_STATS(sock_net(sk), 1444 UDP_MIB_SNDBUFERRORS, is_udplite); 1445 err = 0; 1446 } 1447 } else { 1448 UDP6_INC_STATS(sock_net(sk), 1449 UDP_MIB_OUTDATAGRAMS, is_udplite); 1450 } 1451 return err; 1452 } 1453 1454 static int udp_v6_push_pending_frames(struct sock *sk) 1455 { 1456 struct sk_buff *skb; 1457 struct udp_sock *up = udp_sk(sk); 1458 int err = 0; 1459 1460 if (up->pending == AF_INET) 1461 return udp_push_pending_frames(sk); 1462 1463 skb = ip6_finish_skb(sk); 1464 if (!skb) 1465 goto out; 1466 1467 err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, 1468 &inet_sk(sk)->cork.base); 1469 out: 1470 up->len = 0; 1471 WRITE_ONCE(up->pending, 0); 1472 return err; 1473 } 1474 1475 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1476 { 1477 struct ipv6_txoptions opt_space; 1478 struct udp_sock *up = udp_sk(sk); 1479 struct inet_sock *inet = inet_sk(sk); 1480 struct ipv6_pinfo *np = inet6_sk(sk); 1481 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 1482 struct in6_addr *daddr, *final_p, final; 1483 struct ipv6_txoptions *opt = NULL; 1484 struct ipv6_txoptions *opt_to_free = NULL; 1485 struct ip6_flowlabel *flowlabel = NULL; 1486 struct inet_cork_full cork; 1487 struct flowi6 *fl6 = &cork.fl.u.ip6; 1488 struct dst_entry *dst; 1489 struct ipcm6_cookie ipc6; 1490 int addr_len = msg->msg_namelen; 1491 bool connected = false; 1492 int ulen = len; 1493 int corkreq = udp_test_bit(CORK, sk) || msg->msg_flags & MSG_MORE; 1494 int err; 1495 int is_udplite = IS_UDPLITE(sk); 1496 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1497 1498 ipcm6_init_sk(&ipc6, sk); 1499 ipc6.gso_size = READ_ONCE(up->gso_size); 1500 1501 /* destination address check */ 1502 if (sin6) { 1503 if (addr_len < offsetof(struct sockaddr, sa_data)) 1504 return -EINVAL; 1505 1506 switch (sin6->sin6_family) { 1507 case AF_INET6: 1508 if (addr_len < SIN6_LEN_RFC2133) 1509 return -EINVAL; 1510 daddr = &sin6->sin6_addr; 1511 if (ipv6_addr_any(daddr) && 1512 ipv6_addr_v4mapped(&np->saddr)) 1513 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1514 daddr); 1515 break; 1516 case AF_INET: 1517 goto do_udp_sendmsg; 1518 case AF_UNSPEC: 1519 msg->msg_name = sin6 = NULL; 1520 msg->msg_namelen = addr_len = 0; 1521 daddr = NULL; 1522 break; 1523 default: 1524 return -EINVAL; 1525 } 1526 } else if (!READ_ONCE(up->pending)) { 1527 if (sk->sk_state != TCP_ESTABLISHED) 1528 return -EDESTADDRREQ; 1529 daddr = &sk->sk_v6_daddr; 1530 } else 1531 daddr = NULL; 1532 1533 if (daddr) { 1534 if (ipv6_addr_v4mapped(daddr)) { 1535 struct sockaddr_in sin; 1536 sin.sin_family = AF_INET; 1537 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1538 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1539 msg->msg_name = &sin; 1540 msg->msg_namelen = sizeof(sin); 1541 do_udp_sendmsg: 1542 err = ipv6_only_sock(sk) ? 1543 -ENETUNREACH : udp_sendmsg(sk, msg, len); 1544 msg->msg_name = sin6; 1545 msg->msg_namelen = addr_len; 1546 return err; 1547 } 1548 } 1549 1550 /* Rough check on arithmetic overflow, 1551 better check is made in ip6_append_data(). 1552 */ 1553 if (len > INT_MAX - sizeof(struct udphdr)) 1554 return -EMSGSIZE; 1555 1556 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1557 if (READ_ONCE(up->pending)) { 1558 if (READ_ONCE(up->pending) == AF_INET) 1559 return udp_sendmsg(sk, msg, len); 1560 /* 1561 * There are pending frames. 1562 * The socket lock must be held while it's corked. 1563 */ 1564 lock_sock(sk); 1565 if (likely(up->pending)) { 1566 if (unlikely(up->pending != AF_INET6)) { 1567 release_sock(sk); 1568 return -EAFNOSUPPORT; 1569 } 1570 dst = NULL; 1571 goto do_append_data; 1572 } 1573 release_sock(sk); 1574 } 1575 ulen += sizeof(struct udphdr); 1576 1577 memset(fl6, 0, sizeof(*fl6)); 1578 1579 if (sin6) { 1580 if (sin6->sin6_port == 0) 1581 return -EINVAL; 1582 1583 fl6->fl6_dport = sin6->sin6_port; 1584 daddr = &sin6->sin6_addr; 1585 1586 if (inet6_test_bit(SNDFLOW, sk)) { 1587 fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1588 if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { 1589 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 1590 if (IS_ERR(flowlabel)) 1591 return -EINVAL; 1592 } 1593 } 1594 1595 /* 1596 * Otherwise it will be difficult to maintain 1597 * sk->sk_dst_cache. 1598 */ 1599 if (sk->sk_state == TCP_ESTABLISHED && 1600 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1601 daddr = &sk->sk_v6_daddr; 1602 1603 if (addr_len >= sizeof(struct sockaddr_in6) && 1604 sin6->sin6_scope_id && 1605 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1606 fl6->flowi6_oif = sin6->sin6_scope_id; 1607 } else { 1608 if (sk->sk_state != TCP_ESTABLISHED) 1609 return -EDESTADDRREQ; 1610 1611 fl6->fl6_dport = inet->inet_dport; 1612 daddr = &sk->sk_v6_daddr; 1613 fl6->flowlabel = np->flow_label; 1614 connected = true; 1615 } 1616 1617 if (!fl6->flowi6_oif) 1618 fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); 1619 1620 if (!fl6->flowi6_oif) 1621 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1622 1623 fl6->flowi6_uid = sk->sk_uid; 1624 1625 if (msg->msg_controllen) { 1626 opt = &opt_space; 1627 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1628 opt->tot_len = sizeof(*opt); 1629 ipc6.opt = opt; 1630 1631 err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 1632 if (err > 0) { 1633 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, 1634 &ipc6); 1635 connected = false; 1636 } 1637 if (err < 0) { 1638 fl6_sock_release(flowlabel); 1639 return err; 1640 } 1641 if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1642 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 1643 if (IS_ERR(flowlabel)) 1644 return -EINVAL; 1645 } 1646 if (!(opt->opt_nflen|opt->opt_flen)) 1647 opt = NULL; 1648 } 1649 if (!opt) { 1650 opt = txopt_get(np); 1651 opt_to_free = opt; 1652 } 1653 if (flowlabel) 1654 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1655 opt = ipv6_fixup_options(&opt_space, opt); 1656 ipc6.opt = opt; 1657 1658 fl6->flowi6_proto = sk->sk_protocol; 1659 fl6->flowi6_mark = ipc6.sockc.mark; 1660 fl6->daddr = *daddr; 1661 if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) 1662 fl6->saddr = np->saddr; 1663 fl6->fl6_sport = inet->inet_sport; 1664 1665 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { 1666 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 1667 (struct sockaddr *)sin6, 1668 &addr_len, 1669 &fl6->saddr); 1670 if (err) 1671 goto out_no_dst; 1672 if (sin6) { 1673 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 1674 /* BPF program rewrote IPv6-only by IPv4-mapped 1675 * IPv6. It's currently unsupported. 1676 */ 1677 err = -ENOTSUPP; 1678 goto out_no_dst; 1679 } 1680 if (sin6->sin6_port == 0) { 1681 /* BPF program set invalid port. Reject it. */ 1682 err = -EINVAL; 1683 goto out_no_dst; 1684 } 1685 fl6->fl6_dport = sin6->sin6_port; 1686 fl6->daddr = sin6->sin6_addr; 1687 } 1688 } 1689 1690 if (ipv6_addr_any(&fl6->daddr)) 1691 fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1692 1693 final_p = fl6_update_dst(fl6, opt, &final); 1694 if (final_p) 1695 connected = false; 1696 1697 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { 1698 fl6->flowi6_oif = READ_ONCE(np->mcast_oif); 1699 connected = false; 1700 } else if (!fl6->flowi6_oif) 1701 fl6->flowi6_oif = READ_ONCE(np->ucast_oif); 1702 1703 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 1704 1705 fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); 1706 1707 dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); 1708 if (IS_ERR(dst)) { 1709 err = PTR_ERR(dst); 1710 dst = NULL; 1711 goto out; 1712 } 1713 1714 if (ipc6.hlimit < 0) 1715 ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); 1716 1717 if (msg->msg_flags&MSG_CONFIRM) 1718 goto do_confirm; 1719 back_from_confirm: 1720 1721 /* Lockless fast path for the non-corking case */ 1722 if (!corkreq) { 1723 struct sk_buff *skb; 1724 1725 skb = ip6_make_skb(sk, getfrag, msg, ulen, 1726 sizeof(struct udphdr), &ipc6, 1727 dst_rt6_info(dst), 1728 msg->msg_flags, &cork); 1729 err = PTR_ERR(skb); 1730 if (!IS_ERR_OR_NULL(skb)) 1731 err = udp_v6_send_skb(skb, fl6, &cork.base); 1732 /* ip6_make_skb steals dst reference */ 1733 goto out_no_dst; 1734 } 1735 1736 lock_sock(sk); 1737 if (unlikely(up->pending)) { 1738 /* The socket is already corked while preparing it. */ 1739 /* ... which is an evident application bug. --ANK */ 1740 release_sock(sk); 1741 1742 net_dbg_ratelimited("udp cork app bug 2\n"); 1743 err = -EINVAL; 1744 goto out; 1745 } 1746 1747 WRITE_ONCE(up->pending, AF_INET6); 1748 1749 do_append_data: 1750 up->len += ulen; 1751 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 1752 &ipc6, fl6, dst_rt6_info(dst), 1753 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1754 if (err) 1755 udp_v6_flush_pending_frames(sk); 1756 else if (!corkreq) 1757 err = udp_v6_push_pending_frames(sk); 1758 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1759 WRITE_ONCE(up->pending, 0); 1760 1761 if (err > 0) 1762 err = inet6_test_bit(RECVERR6, sk) ? net_xmit_errno(err) : 0; 1763 release_sock(sk); 1764 1765 out: 1766 dst_release(dst); 1767 out_no_dst: 1768 fl6_sock_release(flowlabel); 1769 txopt_put(opt_to_free); 1770 if (!err) 1771 return len; 1772 /* 1773 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1774 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1775 * we don't have a good statistic (IpOutDiscards but it can be too many 1776 * things). We could add another new stat but at least for now that 1777 * seems like overkill. 1778 */ 1779 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1780 UDP6_INC_STATS(sock_net(sk), 1781 UDP_MIB_SNDBUFERRORS, is_udplite); 1782 } 1783 return err; 1784 1785 do_confirm: 1786 if (msg->msg_flags & MSG_PROBE) 1787 dst_confirm_neigh(dst, &fl6->daddr); 1788 if (!(msg->msg_flags&MSG_PROBE) || len) 1789 goto back_from_confirm; 1790 err = 0; 1791 goto out; 1792 } 1793 EXPORT_SYMBOL(udpv6_sendmsg); 1794 1795 static void udpv6_splice_eof(struct socket *sock) 1796 { 1797 struct sock *sk = sock->sk; 1798 struct udp_sock *up = udp_sk(sk); 1799 1800 if (!READ_ONCE(up->pending) || udp_test_bit(CORK, sk)) 1801 return; 1802 1803 lock_sock(sk); 1804 if (up->pending && !udp_test_bit(CORK, sk)) 1805 udp_v6_push_pending_frames(sk); 1806 release_sock(sk); 1807 } 1808 1809 void udpv6_destroy_sock(struct sock *sk) 1810 { 1811 struct udp_sock *up = udp_sk(sk); 1812 lock_sock(sk); 1813 1814 /* protects from races with udp_abort() */ 1815 sock_set_flag(sk, SOCK_DEAD); 1816 udp_v6_flush_pending_frames(sk); 1817 release_sock(sk); 1818 1819 if (static_branch_unlikely(&udpv6_encap_needed_key)) { 1820 if (up->encap_type) { 1821 void (*encap_destroy)(struct sock *sk); 1822 encap_destroy = READ_ONCE(up->encap_destroy); 1823 if (encap_destroy) 1824 encap_destroy(sk); 1825 } 1826 if (udp_test_bit(ENCAP_ENABLED, sk)) { 1827 static_branch_dec(&udpv6_encap_needed_key); 1828 udp_encap_disable(); 1829 udp_tunnel_cleanup_gro(sk); 1830 } 1831 } 1832 } 1833 1834 /* 1835 * Socket option code for UDP 1836 */ 1837 int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1838 unsigned int optlen) 1839 { 1840 if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET) 1841 return udp_lib_setsockopt(sk, level, optname, 1842 optval, optlen, 1843 udp_v6_push_pending_frames); 1844 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1845 } 1846 1847 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1848 char __user *optval, int __user *optlen) 1849 { 1850 if (level == SOL_UDP || level == SOL_UDPLITE) 1851 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1852 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1853 } 1854 1855 1856 /* ------------------------------------------------------------------------ */ 1857 #ifdef CONFIG_PROC_FS 1858 int udp6_seq_show(struct seq_file *seq, void *v) 1859 { 1860 if (v == SEQ_START_TOKEN) { 1861 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1862 } else { 1863 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1864 const struct inet_sock *inet = inet_sk((const struct sock *)v); 1865 __u16 srcp = ntohs(inet->inet_sport); 1866 __u16 destp = ntohs(inet->inet_dport); 1867 __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 1868 udp_rqueue_get(v), bucket); 1869 } 1870 return 0; 1871 } 1872 1873 const struct seq_operations udp6_seq_ops = { 1874 .start = udp_seq_start, 1875 .next = udp_seq_next, 1876 .stop = udp_seq_stop, 1877 .show = udp6_seq_show, 1878 }; 1879 EXPORT_SYMBOL(udp6_seq_ops); 1880 1881 static struct udp_seq_afinfo udp6_seq_afinfo = { 1882 .family = AF_INET6, 1883 .udp_table = NULL, 1884 }; 1885 1886 int __net_init udp6_proc_init(struct net *net) 1887 { 1888 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1889 sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1890 return -ENOMEM; 1891 return 0; 1892 } 1893 1894 void udp6_proc_exit(struct net *net) 1895 { 1896 remove_proc_entry("udp6", net->proc_net); 1897 } 1898 #endif /* CONFIG_PROC_FS */ 1899 1900 /* ------------------------------------------------------------------------ */ 1901 1902 struct proto udpv6_prot = { 1903 .name = "UDPv6", 1904 .owner = THIS_MODULE, 1905 .close = udp_lib_close, 1906 .pre_connect = udpv6_pre_connect, 1907 .connect = udpv6_connect, 1908 .disconnect = udp_disconnect, 1909 .ioctl = udp_ioctl, 1910 .init = udpv6_init_sock, 1911 .destroy = udpv6_destroy_sock, 1912 .setsockopt = udpv6_setsockopt, 1913 .getsockopt = udpv6_getsockopt, 1914 .sendmsg = udpv6_sendmsg, 1915 .recvmsg = udpv6_recvmsg, 1916 .splice_eof = udpv6_splice_eof, 1917 .release_cb = ip6_datagram_release_cb, 1918 .hash = udp_lib_hash, 1919 .unhash = udp_lib_unhash, 1920 .rehash = udp_v6_rehash, 1921 .get_port = udp_v6_get_port, 1922 .put_port = udp_lib_unhash, 1923 #ifdef CONFIG_BPF_SYSCALL 1924 .psock_update_sk_prot = udp_bpf_update_proto, 1925 #endif 1926 1927 .memory_allocated = &udp_memory_allocated, 1928 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 1929 1930 .sysctl_mem = sysctl_udp_mem, 1931 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 1932 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1933 .obj_size = sizeof(struct udp6_sock), 1934 .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6), 1935 .h.udp_table = NULL, 1936 .diag_destroy = udp_abort, 1937 }; 1938 1939 static struct inet_protosw udpv6_protosw = { 1940 .type = SOCK_DGRAM, 1941 .protocol = IPPROTO_UDP, 1942 .prot = &udpv6_prot, 1943 .ops = &inet6_dgram_ops, 1944 .flags = INET_PROTOSW_PERMANENT, 1945 }; 1946 1947 int __init udpv6_init(void) 1948 { 1949 int ret; 1950 1951 net_hotdata.udpv6_protocol = (struct inet6_protocol) { 1952 .handler = udpv6_rcv, 1953 .err_handler = udpv6_err, 1954 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 1955 }; 1956 ret = inet6_add_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1957 if (ret) 1958 goto out; 1959 1960 ret = inet6_register_protosw(&udpv6_protosw); 1961 if (ret) 1962 goto out_udpv6_protocol; 1963 out: 1964 return ret; 1965 1966 out_udpv6_protocol: 1967 inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1968 goto out; 1969 } 1970 1971 void udpv6_exit(void) 1972 { 1973 inet6_unregister_protosw(&udpv6_protosw); 1974 inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1975 } 1976