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 int res = udp_lib_init_sock(sk); 71 72 sk->sk_destruct = udpv6_destruct_sock; 73 set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags); 74 return res; 75 } 76 77 INDIRECT_CALLABLE_SCOPE 78 u32 udp6_ehashfn(const struct net *net, 79 const struct in6_addr *laddr, 80 const u16 lport, 81 const struct in6_addr *faddr, 82 const __be16 fport) 83 { 84 u32 lhash, fhash; 85 86 net_get_random_once(&udp6_ehash_secret, 87 sizeof(udp6_ehash_secret)); 88 net_get_random_once(&udp_ipv6_hash_secret, 89 sizeof(udp_ipv6_hash_secret)); 90 91 lhash = (__force u32)laddr->s6_addr32[3]; 92 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 93 94 return __inet6_ehashfn(lhash, lport, fhash, fport, 95 udp6_ehash_secret + net_hash_mix(net)); 96 } 97 98 int udp_v6_get_port(struct sock *sk, unsigned short snum) 99 { 100 unsigned int hash2_nulladdr = 101 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 102 unsigned int hash2_partial = 103 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 104 105 /* precompute partial secondary hash */ 106 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 107 return udp_lib_get_port(sk, snum, hash2_nulladdr); 108 } 109 110 void udp_v6_rehash(struct sock *sk) 111 { 112 u16 new_hash = ipv6_portaddr_hash(sock_net(sk), 113 &sk->sk_v6_rcv_saddr, 114 inet_sk(sk)->inet_num); 115 u16 new_hash4; 116 117 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) { 118 new_hash4 = udp_ehashfn(sock_net(sk), 119 sk->sk_rcv_saddr, sk->sk_num, 120 sk->sk_daddr, sk->sk_dport); 121 } else { 122 new_hash4 = udp6_ehashfn(sock_net(sk), 123 &sk->sk_v6_rcv_saddr, sk->sk_num, 124 &sk->sk_v6_daddr, sk->sk_dport); 125 } 126 127 udp_lib_rehash(sk, new_hash, new_hash4); 128 } 129 130 static int compute_score(struct sock *sk, const struct net *net, 131 const struct in6_addr *saddr, __be16 sport, 132 const struct in6_addr *daddr, unsigned short hnum, 133 int dif, int sdif) 134 { 135 int bound_dev_if, score; 136 struct inet_sock *inet; 137 bool dev_match; 138 139 if (!net_eq(sock_net(sk), net) || 140 udp_sk(sk)->udp_port_hash != hnum || 141 sk->sk_family != PF_INET6) 142 return -1; 143 144 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 145 return -1; 146 147 score = 0; 148 inet = inet_sk(sk); 149 150 if (inet->inet_dport) { 151 if (inet->inet_dport != sport) 152 return -1; 153 score++; 154 } 155 156 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 157 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 158 return -1; 159 score++; 160 } 161 162 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 163 dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif); 164 if (!dev_match) 165 return -1; 166 if (bound_dev_if) 167 score++; 168 169 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) 170 score++; 171 172 return score; 173 } 174 175 /** 176 * udp6_lib_lookup1() - Simplified lookup using primary hash (destination port) 177 * @net: Network namespace 178 * @saddr: Source address, network order 179 * @sport: Source port, network order 180 * @daddr: Destination address, network order 181 * @hnum: Destination port, host order 182 * @dif: Destination interface index 183 * @sdif: Destination bridge port index, if relevant 184 * @udptable: Set of UDP hash tables 185 * 186 * Simplified lookup to be used as fallback if no sockets are found due to a 187 * potential race between (receive) address change, and lookup happening before 188 * the rehash operation. This function ignores SO_REUSEPORT groups while scoring 189 * result sockets, because if we have one, we don't need the fallback at all. 190 * 191 * Called under rcu_read_lock(). 192 * 193 * Return: socket with highest matching score if any, NULL if none 194 */ 195 static struct sock *udp6_lib_lookup1(const struct net *net, 196 const struct in6_addr *saddr, __be16 sport, 197 const struct in6_addr *daddr, 198 unsigned int hnum, int dif, int sdif, 199 const struct udp_table *udptable) 200 { 201 unsigned int slot = udp_hashfn(net, hnum, udptable->mask); 202 struct udp_hslot *hslot = &udptable->hash[slot]; 203 struct sock *sk, *result = NULL; 204 int score, badness = 0; 205 206 sk_for_each_rcu(sk, &hslot->head) { 207 score = compute_score(sk, net, 208 saddr, sport, daddr, hnum, dif, sdif); 209 if (score > badness) { 210 result = sk; 211 badness = score; 212 } 213 } 214 215 return result; 216 } 217 218 /* called with rcu_read_lock() */ 219 static struct sock *udp6_lib_lookup2(const struct net *net, 220 const struct in6_addr *saddr, __be16 sport, 221 const struct in6_addr *daddr, unsigned int hnum, 222 int dif, int sdif, struct udp_hslot *hslot2, 223 struct sk_buff *skb) 224 { 225 struct sock *sk, *result; 226 int score, badness; 227 bool need_rescore; 228 229 result = NULL; 230 badness = -1; 231 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 232 need_rescore = false; 233 rescore: 234 score = compute_score(need_rescore ? result : sk, net, saddr, 235 sport, daddr, hnum, dif, sdif); 236 if (score > badness) { 237 badness = score; 238 239 if (need_rescore) 240 continue; 241 242 if (sk->sk_state == TCP_ESTABLISHED) { 243 result = sk; 244 continue; 245 } 246 247 result = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr), 248 saddr, sport, daddr, hnum, udp6_ehashfn); 249 if (!result) { 250 result = sk; 251 continue; 252 } 253 254 /* Fall back to scoring if group has connections */ 255 if (!reuseport_has_conns(sk)) 256 return result; 257 258 /* Reuseport logic returned an error, keep original score. */ 259 if (IS_ERR(result)) 260 continue; 261 262 /* compute_score is too long of a function to be 263 * inlined, and calling it again here yields 264 * measurable overhead for some 265 * workloads. Work around it by jumping 266 * backwards to rescore 'result'. 267 */ 268 need_rescore = true; 269 goto rescore; 270 } 271 } 272 return result; 273 } 274 275 #if IS_ENABLED(CONFIG_BASE_SMALL) 276 static struct sock *udp6_lib_lookup4(const struct net *net, 277 const struct in6_addr *saddr, __be16 sport, 278 const struct in6_addr *daddr, 279 unsigned int hnum, int dif, int sdif, 280 struct udp_table *udptable) 281 { 282 return NULL; 283 } 284 285 static void udp6_hash4(struct sock *sk) 286 { 287 } 288 #else /* !CONFIG_BASE_SMALL */ 289 static struct sock *udp6_lib_lookup4(const struct net *net, 290 const struct in6_addr *saddr, __be16 sport, 291 const struct in6_addr *daddr, 292 unsigned int hnum, int dif, int sdif, 293 struct udp_table *udptable) 294 { 295 const __portpair ports = INET_COMBINED_PORTS(sport, hnum); 296 const struct hlist_nulls_node *node; 297 struct udp_hslot *hslot4; 298 unsigned int hash4, slot; 299 struct udp_sock *up; 300 struct sock *sk; 301 302 hash4 = udp6_ehashfn(net, daddr, hnum, saddr, sport); 303 slot = hash4 & udptable->mask; 304 hslot4 = &udptable->hash4[slot]; 305 306 begin: 307 udp_lrpa_for_each_entry_rcu(up, node, &hslot4->nulls_head) { 308 sk = (struct sock *)up; 309 if (inet6_match(net, sk, saddr, daddr, ports, dif, sdif)) 310 return sk; 311 } 312 313 /* if the nulls value we got at the end of this lookup is not the 314 * expected one, we must restart lookup. We probably met an item that 315 * was moved to another chain due to rehash. 316 */ 317 if (get_nulls_value(node) != slot) 318 goto begin; 319 320 return NULL; 321 } 322 323 static void udp6_hash4(struct sock *sk) 324 { 325 struct net *net = sock_net(sk); 326 unsigned int hash; 327 328 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) { 329 udp4_hash4(sk); 330 return; 331 } 332 333 if (sk_unhashed(sk) || ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 334 return; 335 336 hash = udp6_ehashfn(net, &sk->sk_v6_rcv_saddr, sk->sk_num, 337 &sk->sk_v6_daddr, sk->sk_dport); 338 339 udp_lib_hash4(sk, hash); 340 } 341 #endif /* CONFIG_BASE_SMALL */ 342 343 /* rcu_read_lock() must be held */ 344 struct sock *__udp6_lib_lookup(const struct net *net, 345 const struct in6_addr *saddr, __be16 sport, 346 const struct in6_addr *daddr, __be16 dport, 347 int dif, int sdif, struct udp_table *udptable, 348 struct sk_buff *skb) 349 { 350 unsigned short hnum = ntohs(dport); 351 struct udp_hslot *hslot2; 352 struct sock *result, *sk; 353 unsigned int hash2; 354 355 hash2 = ipv6_portaddr_hash(net, daddr, hnum); 356 hslot2 = udp_hashslot2(udptable, hash2); 357 358 if (udp_has_hash4(hslot2)) { 359 result = udp6_lib_lookup4(net, saddr, sport, daddr, hnum, 360 dif, sdif, udptable); 361 if (result) /* udp6_lib_lookup4 return sk or NULL */ 362 return result; 363 } 364 365 /* Lookup connected or non-wildcard sockets */ 366 result = udp6_lib_lookup2(net, saddr, sport, 367 daddr, hnum, dif, sdif, 368 hslot2, skb); 369 if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) 370 goto done; 371 372 /* Lookup redirect from BPF */ 373 if (static_branch_unlikely(&bpf_sk_lookup_enabled) && 374 udptable == net->ipv4.udp_table) { 375 sk = inet6_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr), 376 saddr, sport, daddr, hnum, dif, 377 udp6_ehashfn); 378 if (sk) { 379 result = sk; 380 goto done; 381 } 382 } 383 384 /* Got non-wildcard socket or error on first lookup */ 385 if (result) 386 goto done; 387 388 /* Lookup wildcard sockets */ 389 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); 390 hslot2 = udp_hashslot2(udptable, hash2); 391 392 result = udp6_lib_lookup2(net, saddr, sport, 393 &in6addr_any, hnum, dif, sdif, 394 hslot2, skb); 395 if (!IS_ERR_OR_NULL(result)) 396 goto done; 397 398 /* Cover address change/lookup/rehash race: see __udp4_lib_lookup() */ 399 result = udp6_lib_lookup1(net, saddr, sport, daddr, hnum, dif, sdif, 400 udptable); 401 402 done: 403 if (IS_ERR(result)) 404 return NULL; 405 return result; 406 } 407 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 408 409 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 410 __be16 sport, __be16 dport, 411 struct udp_table *udptable) 412 { 413 const struct ipv6hdr *iph = ipv6_hdr(skb); 414 415 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 416 &iph->daddr, dport, inet6_iif(skb), 417 inet6_sdif(skb), udptable, skb); 418 } 419 420 struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, 421 __be16 sport, __be16 dport) 422 { 423 const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation]; 424 const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset); 425 struct net *net = dev_net(skb->dev); 426 int iif, sdif; 427 428 inet6_get_iif_sdif(skb, &iif, &sdif); 429 430 return __udp6_lib_lookup(net, &iph->saddr, sport, 431 &iph->daddr, dport, iif, 432 sdif, net->ipv4.udp_table, NULL); 433 } 434 435 /* Must be called under rcu_read_lock(). 436 * Does increment socket refcount. 437 */ 438 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 439 struct sock *udp6_lib_lookup(const struct net *net, const struct in6_addr *saddr, __be16 sport, 440 const struct in6_addr *daddr, __be16 dport, int dif) 441 { 442 struct sock *sk; 443 444 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 445 dif, 0, net->ipv4.udp_table, NULL); 446 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) 447 sk = NULL; 448 return sk; 449 } 450 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 451 #endif 452 453 /* do not use the scratch area len for jumbogram: their length exceeds the 454 * scratch area space; note that the IP6CB flags is still in the first 455 * cacheline, so checking for jumbograms is cheap 456 */ 457 static int udp6_skb_len(struct sk_buff *skb) 458 { 459 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); 460 } 461 462 /* 463 * This should be easy, if there is something there we 464 * return it, otherwise we block. 465 */ 466 467 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 468 int flags, int *addr_len) 469 { 470 struct ipv6_pinfo *np = inet6_sk(sk); 471 struct inet_sock *inet = inet_sk(sk); 472 struct sk_buff *skb; 473 unsigned int ulen, copied; 474 int off, err, peeking = flags & MSG_PEEK; 475 int is_udplite = IS_UDPLITE(sk); 476 struct udp_mib __percpu *mib; 477 bool checksum_valid = false; 478 int is_udp4; 479 480 if (flags & MSG_ERRQUEUE) 481 return ipv6_recv_error(sk, msg, len, addr_len); 482 483 if (np->rxopt.bits.rxpmtu && READ_ONCE(np->rxpmtu)) 484 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 485 486 try_again: 487 off = sk_peek_offset(sk, flags); 488 skb = __skb_recv_udp(sk, flags, &off, &err); 489 if (!skb) 490 return err; 491 492 ulen = udp6_skb_len(skb); 493 copied = len; 494 if (copied > ulen - off) 495 copied = ulen - off; 496 else if (copied < ulen) 497 msg->msg_flags |= MSG_TRUNC; 498 499 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 500 mib = __UDPX_MIB(sk, is_udp4); 501 502 /* 503 * If checksum is needed at all, try to do it while copying the 504 * data. If the data is truncated, or if we only want a partial 505 * coverage checksum (UDP-Lite), do it before the copy. 506 */ 507 508 if (copied < ulen || peeking || 509 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 510 checksum_valid = udp_skb_csum_unnecessary(skb) || 511 !__udp_lib_checksum_complete(skb); 512 if (!checksum_valid) 513 goto csum_copy_err; 514 } 515 516 if (checksum_valid || udp_skb_csum_unnecessary(skb)) { 517 if (udp_skb_is_linear(skb)) 518 err = copy_linear_skb(skb, copied, off, &msg->msg_iter); 519 else 520 err = skb_copy_datagram_msg(skb, off, msg, copied); 521 } else { 522 err = skb_copy_and_csum_datagram_msg(skb, off, msg); 523 if (err == -EINVAL) 524 goto csum_copy_err; 525 } 526 if (unlikely(err)) { 527 if (!peeking) { 528 udp_drops_inc(sk); 529 SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 530 } 531 kfree_skb(skb); 532 return err; 533 } 534 if (!peeking) 535 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); 536 537 sock_recv_cmsgs(msg, sk, skb); 538 539 /* Copy the address. */ 540 if (msg->msg_name) { 541 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 542 sin6->sin6_family = AF_INET6; 543 sin6->sin6_port = udp_hdr(skb)->source; 544 sin6->sin6_flowinfo = 0; 545 546 if (is_udp4) { 547 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 548 &sin6->sin6_addr); 549 sin6->sin6_scope_id = 0; 550 } else { 551 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 552 sin6->sin6_scope_id = 553 ipv6_iface_scope_id(&sin6->sin6_addr, 554 inet6_iif(skb)); 555 } 556 *addr_len = sizeof(*sin6); 557 558 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, 559 (struct sockaddr *)sin6, 560 addr_len); 561 } 562 563 if (udp_test_bit(GRO_ENABLED, sk)) 564 udp_cmsg_recv(msg, sk, skb); 565 566 if (np->rxopt.all) 567 ip6_datagram_recv_common_ctl(sk, msg, skb); 568 569 if (is_udp4) { 570 if (inet_cmsg_flags(inet)) 571 ip_cmsg_recv_offset(msg, sk, skb, 572 sizeof(struct udphdr), off); 573 } else { 574 if (np->rxopt.all) 575 ip6_datagram_recv_specific_ctl(sk, msg, skb); 576 } 577 578 err = copied; 579 if (flags & MSG_TRUNC) 580 err = ulen; 581 582 skb_consume_udp(sk, skb, peeking ? -err : err); 583 return err; 584 585 csum_copy_err: 586 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, 587 udp_skb_destructor)) { 588 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); 589 SNMP_INC_STATS(mib, UDP_MIB_INERRORS); 590 } 591 kfree_skb_reason(skb, SKB_DROP_REASON_UDP_CSUM); 592 593 /* starting over for a new packet, but check if we need to yield */ 594 cond_resched(); 595 msg->msg_flags &= ~MSG_TRUNC; 596 goto try_again; 597 } 598 599 DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key); 600 void udpv6_encap_enable(void) 601 { 602 static_branch_inc(&udpv6_encap_needed_key); 603 } 604 EXPORT_SYMBOL(udpv6_encap_enable); 605 606 /* Handler for tunnels with arbitrary destination ports: no socket lookup, go 607 * through error handlers in encapsulations looking for a match. 608 */ 609 static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, 610 struct inet6_skb_parm *opt, 611 u8 type, u8 code, int offset, __be32 info) 612 { 613 int i; 614 615 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { 616 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 617 u8 type, u8 code, int offset, __be32 info); 618 const struct ip6_tnl_encap_ops *encap; 619 620 encap = rcu_dereference(ip6tun_encaps[i]); 621 if (!encap) 622 continue; 623 handler = encap->err_handler; 624 if (handler && !handler(skb, opt, type, code, offset, info)) 625 return 0; 626 } 627 628 return -ENOENT; 629 } 630 631 /* Try to match ICMP errors to UDP tunnels by looking up a socket without 632 * reversing source and destination port: this will match tunnels that force the 633 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that 634 * lwtunnels might actually break this assumption by being configured with 635 * different destination ports on endpoints, in this case we won't be able to 636 * trace ICMP messages back to them. 637 * 638 * If this doesn't match any socket, probe tunnels with arbitrary destination 639 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port 640 * we've sent packets to won't necessarily match the local destination port. 641 * 642 * Then ask the tunnel implementation to match the error against a valid 643 * association. 644 * 645 * Return an error if we can't find a match, the socket if we need further 646 * processing, zero otherwise. 647 */ 648 static struct sock *__udp6_lib_err_encap(struct net *net, 649 const struct ipv6hdr *hdr, int offset, 650 struct udphdr *uh, 651 struct udp_table *udptable, 652 struct sock *sk, 653 struct sk_buff *skb, 654 struct inet6_skb_parm *opt, 655 u8 type, u8 code, __be32 info) 656 { 657 int (*lookup)(struct sock *sk, struct sk_buff *skb); 658 int network_offset, transport_offset; 659 struct udp_sock *up; 660 661 network_offset = skb_network_offset(skb); 662 transport_offset = skb_transport_offset(skb); 663 664 /* Network header needs to point to the outer IPv6 header inside ICMP */ 665 skb_reset_network_header(skb); 666 667 /* Transport header needs to point to the UDP header */ 668 skb_set_transport_header(skb, offset); 669 670 if (sk) { 671 up = udp_sk(sk); 672 673 lookup = READ_ONCE(up->encap_err_lookup); 674 if (lookup && lookup(sk, skb)) 675 sk = NULL; 676 677 goto out; 678 } 679 680 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, 681 &hdr->saddr, uh->dest, 682 inet6_iif(skb), 0, udptable, skb); 683 if (sk) { 684 up = udp_sk(sk); 685 686 lookup = READ_ONCE(up->encap_err_lookup); 687 if (!lookup || lookup(sk, skb)) 688 sk = NULL; 689 } 690 691 out: 692 if (!sk) { 693 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, 694 offset, info)); 695 } 696 697 skb_set_transport_header(skb, transport_offset); 698 skb_set_network_header(skb, network_offset); 699 700 return sk; 701 } 702 703 int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 704 u8 type, u8 code, int offset, __be32 info, 705 struct udp_table *udptable) 706 { 707 struct ipv6_pinfo *np; 708 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 709 const struct in6_addr *saddr = &hdr->saddr; 710 const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; 711 struct udphdr *uh = (struct udphdr *)(skb->data+offset); 712 bool tunnel = false; 713 struct sock *sk; 714 int harderr; 715 int err; 716 struct net *net = dev_net(skb->dev); 717 718 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 719 inet6_iif(skb), inet6_sdif(skb), udptable, NULL); 720 721 if (!sk || READ_ONCE(udp_sk(sk)->encap_type)) { 722 /* No socket for error: try tunnels before discarding */ 723 if (static_branch_unlikely(&udpv6_encap_needed_key)) { 724 sk = __udp6_lib_err_encap(net, hdr, offset, uh, 725 udptable, sk, skb, 726 opt, type, code, info); 727 if (!sk) 728 return 0; 729 } else 730 sk = ERR_PTR(-ENOENT); 731 732 if (IS_ERR(sk)) { 733 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 734 ICMP6_MIB_INERRORS); 735 return PTR_ERR(sk); 736 } 737 738 tunnel = true; 739 } 740 741 harderr = icmpv6_err_convert(type, code, &err); 742 np = inet6_sk(sk); 743 744 if (type == ICMPV6_PKT_TOOBIG) { 745 if (!ip6_sk_accept_pmtu(sk)) 746 goto out; 747 ip6_sk_update_pmtu(skb, sk, info); 748 if (READ_ONCE(np->pmtudisc) != IPV6_PMTUDISC_DONT) 749 harderr = 1; 750 } 751 if (type == NDISC_REDIRECT) { 752 if (tunnel) { 753 ip6_redirect(skb, sock_net(sk), inet6_iif(skb), 754 READ_ONCE(sk->sk_mark), 755 sk_uid(sk)); 756 } else { 757 ip6_sk_redirect(skb, sk); 758 } 759 goto out; 760 } 761 762 /* Tunnels don't have an application socket: don't pass errors back */ 763 if (tunnel) { 764 if (udp_sk(sk)->encap_err_rcv) 765 udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest, 766 ntohl(info), (u8 *)(uh+1)); 767 goto out; 768 } 769 770 if (!inet6_test_bit(RECVERR6, sk)) { 771 if (!harderr || sk->sk_state != TCP_ESTABLISHED) 772 goto out; 773 } else { 774 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 775 } 776 777 sk->sk_err = err; 778 sk_error_report(sk); 779 out: 780 return 0; 781 } 782 783 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 784 { 785 int rc; 786 787 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 788 sock_rps_save_rxhash(sk, skb); 789 sk_mark_napi_id(sk, skb); 790 sk_incoming_cpu_update(sk); 791 } else { 792 sk_mark_napi_id_once(sk, skb); 793 } 794 795 rc = __udp_enqueue_schedule_skb(sk, skb); 796 if (rc < 0) { 797 int is_udplite = IS_UDPLITE(sk); 798 enum skb_drop_reason drop_reason; 799 800 /* Note that an ENOMEM error is charged twice */ 801 if (rc == -ENOMEM) { 802 UDP6_INC_STATS(sock_net(sk), 803 UDP_MIB_RCVBUFERRORS, is_udplite); 804 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; 805 } else { 806 UDP6_INC_STATS(sock_net(sk), 807 UDP_MIB_MEMERRORS, is_udplite); 808 drop_reason = SKB_DROP_REASON_PROTO_MEM; 809 } 810 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 811 trace_udp_fail_queue_rcv_skb(rc, sk, skb); 812 sk_skb_reason_drop(sk, skb, drop_reason); 813 return -1; 814 } 815 816 return 0; 817 } 818 819 static __inline__ int udpv6_err(struct sk_buff *skb, 820 struct inet6_skb_parm *opt, u8 type, 821 u8 code, int offset, __be32 info) 822 { 823 return __udp6_lib_err(skb, opt, type, code, offset, info, 824 dev_net(skb->dev)->ipv4.udp_table); 825 } 826 827 static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) 828 { 829 enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; 830 struct udp_sock *up = udp_sk(sk); 831 int is_udplite = IS_UDPLITE(sk); 832 833 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 834 drop_reason = SKB_DROP_REASON_XFRM_POLICY; 835 goto drop; 836 } 837 nf_reset_ct(skb); 838 839 if (static_branch_unlikely(&udpv6_encap_needed_key) && 840 READ_ONCE(up->encap_type)) { 841 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 842 843 /* 844 * This is an encapsulation socket so pass the skb to 845 * the socket's udp_encap_rcv() hook. Otherwise, just 846 * fall through and pass this up the UDP socket. 847 * up->encap_rcv() returns the following value: 848 * =0 if skb was successfully passed to the encap 849 * handler or was discarded by it. 850 * >0 if skb should be passed on to UDP. 851 * <0 if skb should be resubmitted as proto -N 852 */ 853 854 /* if we're overly short, let UDP handle it */ 855 encap_rcv = READ_ONCE(up->encap_rcv); 856 if (encap_rcv) { 857 int ret; 858 859 /* Verify checksum before giving to encap */ 860 if (udp_lib_checksum_complete(skb)) 861 goto csum_error; 862 863 ret = encap_rcv(sk, skb); 864 if (ret <= 0) { 865 __UDP6_INC_STATS(sock_net(sk), 866 UDP_MIB_INDATAGRAMS, 867 is_udplite); 868 return -ret; 869 } 870 } 871 872 /* FALLTHROUGH -- it's a UDP Packet */ 873 } 874 875 /* 876 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 877 */ 878 if (udp_test_bit(UDPLITE_RECV_CC, sk) && UDP_SKB_CB(skb)->partial_cov) { 879 u16 pcrlen = READ_ONCE(up->pcrlen); 880 881 if (pcrlen == 0) { /* full coverage was set */ 882 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 883 UDP_SKB_CB(skb)->cscov, skb->len); 884 goto drop; 885 } 886 if (UDP_SKB_CB(skb)->cscov < pcrlen) { 887 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 888 UDP_SKB_CB(skb)->cscov, pcrlen); 889 goto drop; 890 } 891 } 892 893 prefetch(&sk->sk_rmem_alloc); 894 if (rcu_access_pointer(sk->sk_filter) && 895 udp_lib_checksum_complete(skb)) 896 goto csum_error; 897 898 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr), &drop_reason)) 899 goto drop; 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 udp_drops_inc(sk); 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 udp_drops_inc(sk); 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 taking 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_unsized *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_unsized *uaddr, 1307 int addr_len) 1308 { 1309 int res; 1310 1311 lock_sock(sk); 1312 res = __ip6_datagram_connect(sk, uaddr, addr_len); 1313 if (!res) 1314 udp6_hash4(sk); 1315 release_sock(sk); 1316 return res; 1317 } 1318 1319 /** 1320 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 1321 * @sk: socket we are sending on 1322 * @skb: sk_buff containing the filled-in UDP header 1323 * (checksum field must be zeroed out) 1324 * @saddr: source address 1325 * @daddr: destination address 1326 * @len: length of packet 1327 */ 1328 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 1329 const struct in6_addr *saddr, 1330 const struct in6_addr *daddr, int len) 1331 { 1332 unsigned int offset; 1333 struct udphdr *uh = udp_hdr(skb); 1334 struct sk_buff *frags = skb_shinfo(skb)->frag_list; 1335 __wsum csum = 0; 1336 1337 if (!frags) { 1338 /* Only one fragment on the socket. */ 1339 skb->csum_start = skb_transport_header(skb) - skb->head; 1340 skb->csum_offset = offsetof(struct udphdr, check); 1341 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 1342 } else { 1343 /* 1344 * HW-checksum won't work as there are two or more 1345 * fragments on the socket so that all csums of sk_buffs 1346 * should be together 1347 */ 1348 offset = skb_transport_offset(skb); 1349 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 1350 csum = skb->csum; 1351 1352 skb->ip_summed = CHECKSUM_NONE; 1353 1354 do { 1355 csum = csum_add(csum, frags->csum); 1356 } while ((frags = frags->next)); 1357 1358 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 1359 csum); 1360 if (uh->check == 0) 1361 uh->check = CSUM_MANGLED_0; 1362 } 1363 } 1364 1365 /* 1366 * Sending 1367 */ 1368 1369 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 1370 struct inet_cork *cork) 1371 { 1372 struct sock *sk = skb->sk; 1373 struct udphdr *uh; 1374 int err = 0; 1375 int is_udplite = IS_UDPLITE(sk); 1376 __wsum csum = 0; 1377 int offset = skb_transport_offset(skb); 1378 int len = skb->len - offset; 1379 int datalen = len - sizeof(*uh); 1380 1381 /* 1382 * Create a UDP header 1383 */ 1384 uh = udp_hdr(skb); 1385 uh->source = fl6->fl6_sport; 1386 uh->dest = fl6->fl6_dport; 1387 uh->len = htons(len); 1388 uh->check = 0; 1389 1390 if (cork->gso_size) { 1391 const int hlen = skb_network_header_len(skb) + 1392 sizeof(struct udphdr); 1393 1394 if (hlen + min(datalen, cork->gso_size) > cork->fragsize) { 1395 kfree_skb(skb); 1396 return -EMSGSIZE; 1397 } 1398 if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { 1399 kfree_skb(skb); 1400 return -EINVAL; 1401 } 1402 if (udp_get_no_check6_tx(sk)) { 1403 kfree_skb(skb); 1404 return -EINVAL; 1405 } 1406 if (is_udplite || dst_xfrm(skb_dst(skb))) { 1407 kfree_skb(skb); 1408 return -EIO; 1409 } 1410 1411 if (datalen > cork->gso_size) { 1412 skb_shinfo(skb)->gso_size = cork->gso_size; 1413 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; 1414 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, 1415 cork->gso_size); 1416 1417 /* Don't checksum the payload, skb will get segmented */ 1418 goto csum_partial; 1419 } 1420 } 1421 1422 if (is_udplite) 1423 csum = udplite_csum(skb); 1424 else if (udp_get_no_check6_tx(sk)) { /* UDP csum disabled */ 1425 skb->ip_summed = CHECKSUM_NONE; 1426 goto send; 1427 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1428 csum_partial: 1429 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 1430 goto send; 1431 } else 1432 csum = udp_csum(skb); 1433 1434 /* add protocol-dependent pseudo-header */ 1435 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1436 len, fl6->flowi6_proto, csum); 1437 if (uh->check == 0) 1438 uh->check = CSUM_MANGLED_0; 1439 1440 send: 1441 err = ip6_send_skb(skb); 1442 if (err) { 1443 if (err == -ENOBUFS && !inet6_test_bit(RECVERR6, sk)) { 1444 UDP6_INC_STATS(sock_net(sk), 1445 UDP_MIB_SNDBUFERRORS, is_udplite); 1446 err = 0; 1447 } 1448 } else { 1449 UDP6_INC_STATS(sock_net(sk), 1450 UDP_MIB_OUTDATAGRAMS, is_udplite); 1451 } 1452 return err; 1453 } 1454 1455 static int udp_v6_push_pending_frames(struct sock *sk) 1456 { 1457 struct sk_buff *skb; 1458 struct udp_sock *up = udp_sk(sk); 1459 int err = 0; 1460 1461 if (up->pending == AF_INET) 1462 return udp_push_pending_frames(sk); 1463 1464 skb = ip6_finish_skb(sk); 1465 if (!skb) 1466 goto out; 1467 1468 err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, 1469 &inet_sk(sk)->cork.base); 1470 out: 1471 up->len = 0; 1472 WRITE_ONCE(up->pending, 0); 1473 return err; 1474 } 1475 1476 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1477 { 1478 struct ipv6_txoptions opt_space; 1479 struct udp_sock *up = udp_sk(sk); 1480 struct inet_sock *inet = inet_sk(sk); 1481 struct ipv6_pinfo *np = inet6_sk(sk); 1482 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 1483 struct in6_addr *daddr, *final_p, final; 1484 struct ipv6_txoptions *opt = NULL; 1485 struct ipv6_txoptions *opt_to_free = NULL; 1486 struct ip6_flowlabel *flowlabel = NULL; 1487 struct inet_cork_full cork; 1488 struct flowi6 *fl6 = &cork.fl.u.ip6; 1489 struct dst_entry *dst; 1490 struct ipcm6_cookie ipc6; 1491 int addr_len = msg->msg_namelen; 1492 bool connected = false; 1493 int ulen = len; 1494 int corkreq = udp_test_bit(CORK, sk) || msg->msg_flags & MSG_MORE; 1495 int err; 1496 int is_udplite = IS_UDPLITE(sk); 1497 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1498 1499 ipcm6_init_sk(&ipc6, sk); 1500 ipc6.gso_size = READ_ONCE(up->gso_size); 1501 1502 /* destination address check */ 1503 if (sin6) { 1504 if (addr_len < offsetof(struct sockaddr, sa_data)) 1505 return -EINVAL; 1506 1507 switch (sin6->sin6_family) { 1508 case AF_INET6: 1509 if (addr_len < SIN6_LEN_RFC2133) 1510 return -EINVAL; 1511 daddr = &sin6->sin6_addr; 1512 if (ipv6_addr_any(daddr) && 1513 ipv6_addr_v4mapped(&np->saddr)) 1514 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), 1515 daddr); 1516 break; 1517 case AF_INET: 1518 goto do_udp_sendmsg; 1519 case AF_UNSPEC: 1520 msg->msg_name = sin6 = NULL; 1521 msg->msg_namelen = addr_len = 0; 1522 daddr = NULL; 1523 break; 1524 default: 1525 return -EINVAL; 1526 } 1527 } else if (!READ_ONCE(up->pending)) { 1528 if (sk->sk_state != TCP_ESTABLISHED) 1529 return -EDESTADDRREQ; 1530 daddr = &sk->sk_v6_daddr; 1531 } else 1532 daddr = NULL; 1533 1534 if (daddr) { 1535 if (ipv6_addr_v4mapped(daddr)) { 1536 struct sockaddr_in sin; 1537 sin.sin_family = AF_INET; 1538 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1539 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1540 msg->msg_name = &sin; 1541 msg->msg_namelen = sizeof(sin); 1542 do_udp_sendmsg: 1543 err = ipv6_only_sock(sk) ? 1544 -ENETUNREACH : udp_sendmsg(sk, msg, len); 1545 msg->msg_name = sin6; 1546 msg->msg_namelen = addr_len; 1547 return err; 1548 } 1549 } 1550 1551 /* Rough check on arithmetic overflow, 1552 better check is made in ip6_append_data(). 1553 */ 1554 if (len > INT_MAX - sizeof(struct udphdr)) 1555 return -EMSGSIZE; 1556 1557 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1558 if (READ_ONCE(up->pending)) { 1559 if (READ_ONCE(up->pending) == AF_INET) 1560 return udp_sendmsg(sk, msg, len); 1561 /* 1562 * There are pending frames. 1563 * The socket lock must be held while it's corked. 1564 */ 1565 lock_sock(sk); 1566 if (likely(up->pending)) { 1567 if (unlikely(up->pending != AF_INET6)) { 1568 release_sock(sk); 1569 return -EAFNOSUPPORT; 1570 } 1571 dst = NULL; 1572 goto do_append_data; 1573 } 1574 release_sock(sk); 1575 } 1576 ulen += sizeof(struct udphdr); 1577 1578 memset(fl6, 0, sizeof(*fl6)); 1579 1580 if (sin6) { 1581 if (sin6->sin6_port == 0) 1582 return -EINVAL; 1583 1584 fl6->fl6_dport = sin6->sin6_port; 1585 daddr = &sin6->sin6_addr; 1586 1587 if (inet6_test_bit(SNDFLOW, sk)) { 1588 fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1589 if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { 1590 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 1591 if (IS_ERR(flowlabel)) 1592 return -EINVAL; 1593 } 1594 } 1595 1596 /* 1597 * Otherwise it will be difficult to maintain 1598 * sk->sk_dst_cache. 1599 */ 1600 if (sk->sk_state == TCP_ESTABLISHED && 1601 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1602 daddr = &sk->sk_v6_daddr; 1603 1604 if (addr_len >= sizeof(struct sockaddr_in6) && 1605 sin6->sin6_scope_id && 1606 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1607 fl6->flowi6_oif = sin6->sin6_scope_id; 1608 } else { 1609 if (sk->sk_state != TCP_ESTABLISHED) 1610 return -EDESTADDRREQ; 1611 1612 fl6->fl6_dport = inet->inet_dport; 1613 daddr = &sk->sk_v6_daddr; 1614 fl6->flowlabel = np->flow_label; 1615 connected = true; 1616 } 1617 1618 if (!fl6->flowi6_oif) 1619 fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); 1620 1621 if (!fl6->flowi6_oif) 1622 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1623 1624 fl6->flowi6_uid = sk_uid(sk); 1625 1626 if (msg->msg_controllen) { 1627 opt = &opt_space; 1628 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1629 opt->tot_len = sizeof(*opt); 1630 ipc6.opt = opt; 1631 1632 err = udp_cmsg_send(sk, msg, &ipc6.gso_size); 1633 if (err > 0) { 1634 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, 1635 &ipc6); 1636 connected = false; 1637 } 1638 if (err < 0) { 1639 fl6_sock_release(flowlabel); 1640 return err; 1641 } 1642 if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1643 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); 1644 if (IS_ERR(flowlabel)) 1645 return -EINVAL; 1646 } 1647 if (!(opt->opt_nflen|opt->opt_flen)) 1648 opt = NULL; 1649 } 1650 if (!opt) { 1651 opt = txopt_get(np); 1652 opt_to_free = opt; 1653 } 1654 if (flowlabel) 1655 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1656 opt = ipv6_fixup_options(&opt_space, opt); 1657 ipc6.opt = opt; 1658 1659 fl6->flowi6_proto = sk->sk_protocol; 1660 fl6->flowi6_mark = ipc6.sockc.mark; 1661 fl6->daddr = *daddr; 1662 if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) 1663 fl6->saddr = np->saddr; 1664 fl6->fl6_sport = inet->inet_sport; 1665 1666 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { 1667 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, 1668 (struct sockaddr *)sin6, 1669 &addr_len, 1670 &fl6->saddr); 1671 if (err) 1672 goto out_no_dst; 1673 if (sin6) { 1674 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { 1675 /* BPF program rewrote IPv6-only by IPv4-mapped 1676 * IPv6. It's currently unsupported. 1677 */ 1678 err = -ENOTSUPP; 1679 goto out_no_dst; 1680 } 1681 if (sin6->sin6_port == 0) { 1682 /* BPF program set invalid port. Reject it. */ 1683 err = -EINVAL; 1684 goto out_no_dst; 1685 } 1686 fl6->fl6_dport = sin6->sin6_port; 1687 fl6->daddr = sin6->sin6_addr; 1688 } 1689 } 1690 1691 if (ipv6_addr_any(&fl6->daddr)) 1692 fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1693 1694 final_p = fl6_update_dst(fl6, opt, &final); 1695 if (final_p) 1696 connected = false; 1697 1698 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { 1699 fl6->flowi6_oif = READ_ONCE(np->mcast_oif); 1700 connected = false; 1701 } else if (!fl6->flowi6_oif) 1702 fl6->flowi6_oif = READ_ONCE(np->ucast_oif); 1703 1704 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 1705 1706 fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); 1707 1708 dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); 1709 if (IS_ERR(dst)) { 1710 err = PTR_ERR(dst); 1711 dst = NULL; 1712 goto out; 1713 } 1714 1715 if (ipc6.hlimit < 0) 1716 ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); 1717 1718 if (msg->msg_flags&MSG_CONFIRM) 1719 goto do_confirm; 1720 back_from_confirm: 1721 1722 /* Lockless fast path for the non-corking case */ 1723 if (!corkreq) { 1724 struct sk_buff *skb; 1725 1726 skb = ip6_make_skb(sk, getfrag, msg, ulen, 1727 sizeof(struct udphdr), &ipc6, 1728 dst_rt6_info(dst), 1729 msg->msg_flags, &cork); 1730 err = PTR_ERR(skb); 1731 if (!IS_ERR_OR_NULL(skb)) 1732 err = udp_v6_send_skb(skb, fl6, &cork.base); 1733 /* ip6_make_skb steals dst reference */ 1734 goto out_no_dst; 1735 } 1736 1737 lock_sock(sk); 1738 if (unlikely(up->pending)) { 1739 /* The socket is already corked while preparing it. */ 1740 /* ... which is an evident application bug. --ANK */ 1741 release_sock(sk); 1742 1743 net_dbg_ratelimited("udp cork app bug 2\n"); 1744 err = -EINVAL; 1745 goto out; 1746 } 1747 1748 WRITE_ONCE(up->pending, AF_INET6); 1749 1750 do_append_data: 1751 up->len += ulen; 1752 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 1753 &ipc6, fl6, dst_rt6_info(dst), 1754 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1755 if (err) 1756 udp_v6_flush_pending_frames(sk); 1757 else if (!corkreq) 1758 err = udp_v6_push_pending_frames(sk); 1759 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1760 WRITE_ONCE(up->pending, 0); 1761 1762 if (err > 0) 1763 err = inet6_test_bit(RECVERR6, sk) ? net_xmit_errno(err) : 0; 1764 release_sock(sk); 1765 1766 out: 1767 dst_release(dst); 1768 out_no_dst: 1769 fl6_sock_release(flowlabel); 1770 txopt_put(opt_to_free); 1771 if (!err) 1772 return len; 1773 /* 1774 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1775 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1776 * we don't have a good statistic (IpOutDiscards but it can be too many 1777 * things). We could add another new stat but at least for now that 1778 * seems like overkill. 1779 */ 1780 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1781 UDP6_INC_STATS(sock_net(sk), 1782 UDP_MIB_SNDBUFERRORS, is_udplite); 1783 } 1784 return err; 1785 1786 do_confirm: 1787 if (msg->msg_flags & MSG_PROBE) 1788 dst_confirm_neigh(dst, &fl6->daddr); 1789 if (!(msg->msg_flags&MSG_PROBE) || len) 1790 goto back_from_confirm; 1791 err = 0; 1792 goto out; 1793 } 1794 EXPORT_SYMBOL(udpv6_sendmsg); 1795 1796 static void udpv6_splice_eof(struct socket *sock) 1797 { 1798 struct sock *sk = sock->sk; 1799 struct udp_sock *up = udp_sk(sk); 1800 1801 if (!READ_ONCE(up->pending) || udp_test_bit(CORK, sk)) 1802 return; 1803 1804 lock_sock(sk); 1805 if (up->pending && !udp_test_bit(CORK, sk)) 1806 udp_v6_push_pending_frames(sk); 1807 release_sock(sk); 1808 } 1809 1810 void udpv6_destroy_sock(struct sock *sk) 1811 { 1812 struct udp_sock *up = udp_sk(sk); 1813 lock_sock(sk); 1814 1815 /* protects from races with udp_abort() */ 1816 sock_set_flag(sk, SOCK_DEAD); 1817 udp_v6_flush_pending_frames(sk); 1818 release_sock(sk); 1819 1820 if (static_branch_unlikely(&udpv6_encap_needed_key)) { 1821 if (up->encap_type) { 1822 void (*encap_destroy)(struct sock *sk); 1823 encap_destroy = READ_ONCE(up->encap_destroy); 1824 if (encap_destroy) 1825 encap_destroy(sk); 1826 } 1827 if (udp_test_bit(ENCAP_ENABLED, sk)) { 1828 static_branch_dec(&udpv6_encap_needed_key); 1829 udp_encap_disable(); 1830 udp_tunnel_cleanup_gro(sk); 1831 } 1832 } 1833 } 1834 1835 /* 1836 * Socket option code for UDP 1837 */ 1838 int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1839 unsigned int optlen) 1840 { 1841 if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET) 1842 return udp_lib_setsockopt(sk, level, optname, 1843 optval, optlen, 1844 udp_v6_push_pending_frames); 1845 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1846 } 1847 1848 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1849 char __user *optval, int __user *optlen) 1850 { 1851 if (level == SOL_UDP || level == SOL_UDPLITE) 1852 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1853 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1854 } 1855 1856 1857 /* ------------------------------------------------------------------------ */ 1858 #ifdef CONFIG_PROC_FS 1859 int udp6_seq_show(struct seq_file *seq, void *v) 1860 { 1861 if (v == SEQ_START_TOKEN) { 1862 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1863 } else { 1864 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1865 const struct inet_sock *inet = inet_sk((const struct sock *)v); 1866 __u16 srcp = ntohs(inet->inet_sport); 1867 __u16 destp = ntohs(inet->inet_dport); 1868 __ip6_dgram_sock_seq_show(seq, v, srcp, destp, 1869 udp_rqueue_get(v), bucket); 1870 } 1871 return 0; 1872 } 1873 1874 const struct seq_operations udp6_seq_ops = { 1875 .start = udp_seq_start, 1876 .next = udp_seq_next, 1877 .stop = udp_seq_stop, 1878 .show = udp6_seq_show, 1879 }; 1880 EXPORT_SYMBOL(udp6_seq_ops); 1881 1882 static struct udp_seq_afinfo udp6_seq_afinfo = { 1883 .family = AF_INET6, 1884 .udp_table = NULL, 1885 }; 1886 1887 int __net_init udp6_proc_init(struct net *net) 1888 { 1889 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, 1890 sizeof(struct udp_iter_state), &udp6_seq_afinfo)) 1891 return -ENOMEM; 1892 return 0; 1893 } 1894 1895 void udp6_proc_exit(struct net *net) 1896 { 1897 remove_proc_entry("udp6", net->proc_net); 1898 } 1899 #endif /* CONFIG_PROC_FS */ 1900 1901 /* ------------------------------------------------------------------------ */ 1902 1903 struct proto udpv6_prot = { 1904 .name = "UDPv6", 1905 .owner = THIS_MODULE, 1906 .close = udp_lib_close, 1907 .pre_connect = udpv6_pre_connect, 1908 .connect = udpv6_connect, 1909 .disconnect = udp_disconnect, 1910 .ioctl = udp_ioctl, 1911 .init = udpv6_init_sock, 1912 .destroy = udpv6_destroy_sock, 1913 .setsockopt = udpv6_setsockopt, 1914 .getsockopt = udpv6_getsockopt, 1915 .sendmsg = udpv6_sendmsg, 1916 .recvmsg = udpv6_recvmsg, 1917 .splice_eof = udpv6_splice_eof, 1918 .release_cb = ip6_datagram_release_cb, 1919 .hash = udp_lib_hash, 1920 .unhash = udp_lib_unhash, 1921 .rehash = udp_v6_rehash, 1922 .get_port = udp_v6_get_port, 1923 .put_port = udp_lib_unhash, 1924 #ifdef CONFIG_BPF_SYSCALL 1925 .psock_update_sk_prot = udp_bpf_update_proto, 1926 #endif 1927 1928 .memory_allocated = &net_aligned_data.udp_memory_allocated, 1929 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 1930 1931 .sysctl_mem = sysctl_udp_mem, 1932 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 1933 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 1934 .obj_size = sizeof(struct udp6_sock), 1935 .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6), 1936 .h.udp_table = NULL, 1937 .diag_destroy = udp_abort, 1938 }; 1939 1940 static struct inet_protosw udpv6_protosw = { 1941 .type = SOCK_DGRAM, 1942 .protocol = IPPROTO_UDP, 1943 .prot = &udpv6_prot, 1944 .ops = &inet6_dgram_ops, 1945 .flags = INET_PROTOSW_PERMANENT, 1946 }; 1947 1948 int __init udpv6_init(void) 1949 { 1950 int ret; 1951 1952 net_hotdata.udpv6_protocol = (struct inet6_protocol) { 1953 .handler = udpv6_rcv, 1954 .err_handler = udpv6_err, 1955 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 1956 }; 1957 ret = inet6_add_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1958 if (ret) 1959 goto out; 1960 1961 ret = inet6_register_protosw(&udpv6_protosw); 1962 if (ret) 1963 goto out_udpv6_protocol; 1964 out: 1965 return ret; 1966 1967 out_udpv6_protocol: 1968 inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1969 goto out; 1970 } 1971 1972 void udpv6_exit(void) 1973 { 1974 inet6_unregister_protosw(&udpv6_protosw); 1975 inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); 1976 } 1977