1 /* 2 * UDP over IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/udp.c 9 * 10 * Fixes: 11 * Hideaki YOSHIFUJI : sin6_scope_id support 12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14 * a single port at the same time. 15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 */ 23 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/ipv6.h> 33 #include <linux/icmpv6.h> 34 #include <linux/init.h> 35 #include <linux/module.h> 36 #include <linux/skbuff.h> 37 #include <linux/slab.h> 38 #include <asm/uaccess.h> 39 40 #include <net/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/tcp_states.h> 46 #include <net/ip6_checksum.h> 47 #include <net/xfrm.h> 48 #include <net/inet6_hashtables.h> 49 #include <net/busy_poll.h> 50 51 #include <linux/proc_fs.h> 52 #include <linux/seq_file.h> 53 #include <trace/events/skb.h> 54 #include "udp_impl.h" 55 56 static unsigned int udp6_ehashfn(struct net *net, 57 const struct in6_addr *laddr, 58 const u16 lport, 59 const struct in6_addr *faddr, 60 const __be16 fport) 61 { 62 static u32 udp6_ehash_secret __read_mostly; 63 static u32 udp_ipv6_hash_secret __read_mostly; 64 65 u32 lhash, fhash; 66 67 net_get_random_once(&udp6_ehash_secret, 68 sizeof(udp6_ehash_secret)); 69 net_get_random_once(&udp_ipv6_hash_secret, 70 sizeof(udp_ipv6_hash_secret)); 71 72 lhash = (__force u32)laddr->s6_addr32[3]; 73 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 74 75 return __inet6_ehashfn(lhash, lport, fhash, fport, 76 udp_ipv6_hash_secret + net_hash_mix(net)); 77 } 78 79 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 80 { 81 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 82 int sk_ipv6only = ipv6_only_sock(sk); 83 int sk2_ipv6only = inet_v6_ipv6only(sk2); 84 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); 85 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 86 87 /* if both are mapped, treat as IPv4 */ 88 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 89 return (!sk2_ipv6only && 90 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr || 91 sk->sk_rcv_saddr == sk2->sk_rcv_saddr)); 92 93 if (addr_type2 == IPV6_ADDR_ANY && 94 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 95 return 1; 96 97 if (addr_type == IPV6_ADDR_ANY && 98 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 99 return 1; 100 101 if (sk2_rcv_saddr6 && 102 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) 103 return 1; 104 105 return 0; 106 } 107 108 static unsigned int udp6_portaddr_hash(struct net *net, 109 const struct in6_addr *addr6, 110 unsigned int port) 111 { 112 unsigned int hash, mix = net_hash_mix(net); 113 114 if (ipv6_addr_any(addr6)) 115 hash = jhash_1word(0, mix); 116 else if (ipv6_addr_v4mapped(addr6)) 117 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 118 else 119 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 120 121 return hash ^ port; 122 } 123 124 125 int udp_v6_get_port(struct sock *sk, unsigned short snum) 126 { 127 unsigned int hash2_nulladdr = 128 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 129 unsigned int hash2_partial = 130 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 131 132 /* precompute partial secondary hash */ 133 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 134 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 135 } 136 137 static void udp_v6_rehash(struct sock *sk) 138 { 139 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 140 &sk->sk_v6_rcv_saddr, 141 inet_sk(sk)->inet_num); 142 143 udp_lib_rehash(sk, new_hash); 144 } 145 146 static inline int compute_score(struct sock *sk, struct net *net, 147 unsigned short hnum, 148 const struct in6_addr *saddr, __be16 sport, 149 const struct in6_addr *daddr, __be16 dport, 150 int dif) 151 { 152 int score = -1; 153 154 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 155 sk->sk_family == PF_INET6) { 156 struct inet_sock *inet = inet_sk(sk); 157 158 score = 0; 159 if (inet->inet_dport) { 160 if (inet->inet_dport != sport) 161 return -1; 162 score++; 163 } 164 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 165 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 166 return -1; 167 score++; 168 } 169 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 170 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 171 return -1; 172 score++; 173 } 174 if (sk->sk_bound_dev_if) { 175 if (sk->sk_bound_dev_if != dif) 176 return -1; 177 score++; 178 } 179 } 180 return score; 181 } 182 183 #define SCORE2_MAX (1 + 1 + 1) 184 static inline int compute_score2(struct sock *sk, struct net *net, 185 const struct in6_addr *saddr, __be16 sport, 186 const struct in6_addr *daddr, unsigned short hnum, 187 int dif) 188 { 189 int score = -1; 190 191 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 192 sk->sk_family == PF_INET6) { 193 struct inet_sock *inet = inet_sk(sk); 194 195 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 196 return -1; 197 score = 0; 198 if (inet->inet_dport) { 199 if (inet->inet_dport != sport) 200 return -1; 201 score++; 202 } 203 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 204 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 205 return -1; 206 score++; 207 } 208 if (sk->sk_bound_dev_if) { 209 if (sk->sk_bound_dev_if != dif) 210 return -1; 211 score++; 212 } 213 } 214 return score; 215 } 216 217 218 /* called with read_rcu_lock() */ 219 static struct sock *udp6_lib_lookup2(struct net *net, 220 const struct in6_addr *saddr, __be16 sport, 221 const struct in6_addr *daddr, unsigned int hnum, int dif, 222 struct udp_hslot *hslot2, unsigned int slot2) 223 { 224 struct sock *sk, *result; 225 struct hlist_nulls_node *node; 226 int score, badness, matches = 0, reuseport = 0; 227 u32 hash = 0; 228 229 begin: 230 result = NULL; 231 badness = -1; 232 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 233 score = compute_score2(sk, net, saddr, sport, 234 daddr, hnum, dif); 235 if (score > badness) { 236 result = sk; 237 badness = score; 238 reuseport = sk->sk_reuseport; 239 if (reuseport) { 240 hash = udp6_ehashfn(net, daddr, hnum, 241 saddr, sport); 242 matches = 1; 243 } else if (score == SCORE2_MAX) 244 goto exact_match; 245 } else if (score == badness && reuseport) { 246 matches++; 247 if (((u64)hash * matches) >> 32 == 0) 248 result = sk; 249 hash = next_pseudo_random32(hash); 250 } 251 } 252 /* 253 * if the nulls value we got at the end of this lookup is 254 * not the expected one, we must restart lookup. 255 * We probably met an item that was moved to another chain. 256 */ 257 if (get_nulls_value(node) != slot2) 258 goto begin; 259 260 if (result) { 261 exact_match: 262 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 263 result = NULL; 264 else if (unlikely(compute_score2(result, net, saddr, sport, 265 daddr, hnum, dif) < badness)) { 266 sock_put(result); 267 goto begin; 268 } 269 } 270 return result; 271 } 272 273 struct sock *__udp6_lib_lookup(struct net *net, 274 const struct in6_addr *saddr, __be16 sport, 275 const struct in6_addr *daddr, __be16 dport, 276 int dif, struct udp_table *udptable) 277 { 278 struct sock *sk, *result; 279 struct hlist_nulls_node *node; 280 unsigned short hnum = ntohs(dport); 281 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 282 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 283 int score, badness, matches = 0, reuseport = 0; 284 u32 hash = 0; 285 286 rcu_read_lock(); 287 if (hslot->count > 10) { 288 hash2 = udp6_portaddr_hash(net, daddr, hnum); 289 slot2 = hash2 & udptable->mask; 290 hslot2 = &udptable->hash2[slot2]; 291 if (hslot->count < hslot2->count) 292 goto begin; 293 294 result = udp6_lib_lookup2(net, saddr, sport, 295 daddr, hnum, dif, 296 hslot2, slot2); 297 if (!result) { 298 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 299 slot2 = hash2 & udptable->mask; 300 hslot2 = &udptable->hash2[slot2]; 301 if (hslot->count < hslot2->count) 302 goto begin; 303 304 result = udp6_lib_lookup2(net, saddr, sport, 305 &in6addr_any, hnum, dif, 306 hslot2, slot2); 307 } 308 rcu_read_unlock(); 309 return result; 310 } 311 begin: 312 result = NULL; 313 badness = -1; 314 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 315 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 316 if (score > badness) { 317 result = sk; 318 badness = score; 319 reuseport = sk->sk_reuseport; 320 if (reuseport) { 321 hash = udp6_ehashfn(net, daddr, hnum, 322 saddr, sport); 323 matches = 1; 324 } 325 } else if (score == badness && reuseport) { 326 matches++; 327 if (((u64)hash * matches) >> 32 == 0) 328 result = sk; 329 hash = next_pseudo_random32(hash); 330 } 331 } 332 /* 333 * if the nulls value we got at the end of this lookup is 334 * not the expected one, we must restart lookup. 335 * We probably met an item that was moved to another chain. 336 */ 337 if (get_nulls_value(node) != slot) 338 goto begin; 339 340 if (result) { 341 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 342 result = NULL; 343 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 344 daddr, dport, dif) < badness)) { 345 sock_put(result); 346 goto begin; 347 } 348 } 349 rcu_read_unlock(); 350 return result; 351 } 352 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 353 354 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 355 __be16 sport, __be16 dport, 356 struct udp_table *udptable) 357 { 358 struct sock *sk; 359 const struct ipv6hdr *iph = ipv6_hdr(skb); 360 361 if (unlikely(sk = skb_steal_sock(skb))) 362 return sk; 363 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 364 &iph->daddr, dport, inet6_iif(skb), 365 udptable); 366 } 367 368 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 369 const struct in6_addr *daddr, __be16 dport, int dif) 370 { 371 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 372 } 373 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 374 375 376 /* 377 * This should be easy, if there is something there we 378 * return it, otherwise we block. 379 */ 380 381 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 382 struct msghdr *msg, size_t len, 383 int noblock, int flags, int *addr_len) 384 { 385 struct ipv6_pinfo *np = inet6_sk(sk); 386 struct inet_sock *inet = inet_sk(sk); 387 struct sk_buff *skb; 388 unsigned int ulen, copied; 389 int peeked, off = 0; 390 int err; 391 int is_udplite = IS_UDPLITE(sk); 392 int is_udp4; 393 bool slow; 394 395 if (flags & MSG_ERRQUEUE) 396 return ipv6_recv_error(sk, msg, len, addr_len); 397 398 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 399 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 400 401 try_again: 402 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 403 &peeked, &off, &err); 404 if (!skb) 405 goto out; 406 407 ulen = skb->len - sizeof(struct udphdr); 408 copied = len; 409 if (copied > ulen) 410 copied = ulen; 411 else if (copied < ulen) 412 msg->msg_flags |= MSG_TRUNC; 413 414 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 415 416 /* 417 * If checksum is needed at all, try to do it while copying the 418 * data. If the data is truncated, or if we only want a partial 419 * coverage checksum (UDP-Lite), do it before the copy. 420 */ 421 422 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 423 if (udp_lib_checksum_complete(skb)) 424 goto csum_copy_err; 425 } 426 427 if (skb_csum_unnecessary(skb)) 428 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 429 msg->msg_iov, copied); 430 else { 431 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 432 if (err == -EINVAL) 433 goto csum_copy_err; 434 } 435 if (unlikely(err)) { 436 trace_kfree_skb(skb, udpv6_recvmsg); 437 if (!peeked) { 438 atomic_inc(&sk->sk_drops); 439 if (is_udp4) 440 UDP_INC_STATS_USER(sock_net(sk), 441 UDP_MIB_INERRORS, 442 is_udplite); 443 else 444 UDP6_INC_STATS_USER(sock_net(sk), 445 UDP_MIB_INERRORS, 446 is_udplite); 447 } 448 goto out_free; 449 } 450 if (!peeked) { 451 if (is_udp4) 452 UDP_INC_STATS_USER(sock_net(sk), 453 UDP_MIB_INDATAGRAMS, is_udplite); 454 else 455 UDP6_INC_STATS_USER(sock_net(sk), 456 UDP_MIB_INDATAGRAMS, is_udplite); 457 } 458 459 sock_recv_ts_and_drops(msg, sk, skb); 460 461 /* Copy the address. */ 462 if (msg->msg_name) { 463 struct sockaddr_in6 *sin6; 464 465 sin6 = (struct sockaddr_in6 *) msg->msg_name; 466 sin6->sin6_family = AF_INET6; 467 sin6->sin6_port = udp_hdr(skb)->source; 468 sin6->sin6_flowinfo = 0; 469 470 if (is_udp4) { 471 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 472 &sin6->sin6_addr); 473 sin6->sin6_scope_id = 0; 474 } else { 475 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 476 sin6->sin6_scope_id = 477 ipv6_iface_scope_id(&sin6->sin6_addr, 478 IP6CB(skb)->iif); 479 } 480 *addr_len = sizeof(*sin6); 481 } 482 if (is_udp4) { 483 if (inet->cmsg_flags) 484 ip_cmsg_recv(msg, skb); 485 } else { 486 if (np->rxopt.all) 487 ip6_datagram_recv_ctl(sk, msg, skb); 488 } 489 490 err = copied; 491 if (flags & MSG_TRUNC) 492 err = ulen; 493 494 out_free: 495 skb_free_datagram_locked(sk, skb); 496 out: 497 return err; 498 499 csum_copy_err: 500 slow = lock_sock_fast(sk); 501 if (!skb_kill_datagram(sk, skb, flags)) { 502 if (is_udp4) { 503 UDP_INC_STATS_USER(sock_net(sk), 504 UDP_MIB_CSUMERRORS, is_udplite); 505 UDP_INC_STATS_USER(sock_net(sk), 506 UDP_MIB_INERRORS, is_udplite); 507 } else { 508 UDP6_INC_STATS_USER(sock_net(sk), 509 UDP_MIB_CSUMERRORS, is_udplite); 510 UDP6_INC_STATS_USER(sock_net(sk), 511 UDP_MIB_INERRORS, is_udplite); 512 } 513 } 514 unlock_sock_fast(sk, slow); 515 516 if (noblock) 517 return -EAGAIN; 518 519 /* starting over for a new packet */ 520 msg->msg_flags &= ~MSG_TRUNC; 521 goto try_again; 522 } 523 524 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 525 u8 type, u8 code, int offset, __be32 info, 526 struct udp_table *udptable) 527 { 528 struct ipv6_pinfo *np; 529 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 530 const struct in6_addr *saddr = &hdr->saddr; 531 const struct in6_addr *daddr = &hdr->daddr; 532 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 533 struct sock *sk; 534 int err; 535 536 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 537 saddr, uh->source, inet6_iif(skb), udptable); 538 if (sk == NULL) 539 return; 540 541 if (type == ICMPV6_PKT_TOOBIG) { 542 if (!ip6_sk_accept_pmtu(sk)) 543 goto out; 544 ip6_sk_update_pmtu(skb, sk, info); 545 } 546 if (type == NDISC_REDIRECT) { 547 ip6_sk_redirect(skb, sk); 548 goto out; 549 } 550 551 np = inet6_sk(sk); 552 553 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 554 goto out; 555 556 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 557 goto out; 558 559 if (np->recverr) 560 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 561 562 sk->sk_err = err; 563 sk->sk_error_report(sk); 564 out: 565 sock_put(sk); 566 } 567 568 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 569 { 570 int rc; 571 572 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 573 sock_rps_save_rxhash(sk, skb); 574 sk_mark_napi_id(sk, skb); 575 } 576 577 rc = sock_queue_rcv_skb(sk, skb); 578 if (rc < 0) { 579 int is_udplite = IS_UDPLITE(sk); 580 581 /* Note that an ENOMEM error is charged twice */ 582 if (rc == -ENOMEM) 583 UDP6_INC_STATS_BH(sock_net(sk), 584 UDP_MIB_RCVBUFERRORS, is_udplite); 585 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 586 kfree_skb(skb); 587 return -1; 588 } 589 return 0; 590 } 591 592 static __inline__ void udpv6_err(struct sk_buff *skb, 593 struct inet6_skb_parm *opt, u8 type, 594 u8 code, int offset, __be32 info ) 595 { 596 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 597 } 598 599 static struct static_key udpv6_encap_needed __read_mostly; 600 void udpv6_encap_enable(void) 601 { 602 if (!static_key_enabled(&udpv6_encap_needed)) 603 static_key_slow_inc(&udpv6_encap_needed); 604 } 605 EXPORT_SYMBOL(udpv6_encap_enable); 606 607 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 608 { 609 struct udp_sock *up = udp_sk(sk); 610 int rc; 611 int is_udplite = IS_UDPLITE(sk); 612 613 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 614 goto drop; 615 616 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 617 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 618 619 /* 620 * This is an encapsulation socket so pass the skb to 621 * the socket's udp_encap_rcv() hook. Otherwise, just 622 * fall through and pass this up the UDP socket. 623 * up->encap_rcv() returns the following value: 624 * =0 if skb was successfully passed to the encap 625 * handler or was discarded by it. 626 * >0 if skb should be passed on to UDP. 627 * <0 if skb should be resubmitted as proto -N 628 */ 629 630 /* if we're overly short, let UDP handle it */ 631 encap_rcv = ACCESS_ONCE(up->encap_rcv); 632 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 633 int ret; 634 635 ret = encap_rcv(sk, skb); 636 if (ret <= 0) { 637 UDP_INC_STATS_BH(sock_net(sk), 638 UDP_MIB_INDATAGRAMS, 639 is_udplite); 640 return -ret; 641 } 642 } 643 644 /* FALLTHROUGH -- it's a UDP Packet */ 645 } 646 647 /* 648 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 649 */ 650 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 651 652 if (up->pcrlen == 0) { /* full coverage was set */ 653 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 654 " %d while full coverage %d requested\n", 655 UDP_SKB_CB(skb)->cscov, skb->len); 656 goto drop; 657 } 658 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 659 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 660 "too small, need min %d\n", 661 UDP_SKB_CB(skb)->cscov, up->pcrlen); 662 goto drop; 663 } 664 } 665 666 if (rcu_access_pointer(sk->sk_filter)) { 667 if (udp_lib_checksum_complete(skb)) 668 goto csum_error; 669 } 670 671 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 672 goto drop; 673 674 skb_dst_drop(skb); 675 676 bh_lock_sock(sk); 677 rc = 0; 678 if (!sock_owned_by_user(sk)) 679 rc = __udpv6_queue_rcv_skb(sk, skb); 680 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 681 bh_unlock_sock(sk); 682 goto drop; 683 } 684 bh_unlock_sock(sk); 685 686 return rc; 687 csum_error: 688 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 689 drop: 690 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 691 atomic_inc(&sk->sk_drops); 692 kfree_skb(skb); 693 return -1; 694 } 695 696 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 697 __be16 loc_port, const struct in6_addr *loc_addr, 698 __be16 rmt_port, const struct in6_addr *rmt_addr, 699 int dif) 700 { 701 struct hlist_nulls_node *node; 702 struct sock *s = sk; 703 unsigned short num = ntohs(loc_port); 704 705 sk_nulls_for_each_from(s, node) { 706 struct inet_sock *inet = inet_sk(s); 707 708 if (!net_eq(sock_net(s), net)) 709 continue; 710 711 if (udp_sk(s)->udp_port_hash == num && 712 s->sk_family == PF_INET6) { 713 if (inet->inet_dport) { 714 if (inet->inet_dport != rmt_port) 715 continue; 716 } 717 if (!ipv6_addr_any(&sk->sk_v6_daddr) && 718 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) 719 continue; 720 721 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 722 continue; 723 724 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 725 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)) 726 continue; 727 } 728 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 729 continue; 730 return s; 731 } 732 } 733 return NULL; 734 } 735 736 static void flush_stack(struct sock **stack, unsigned int count, 737 struct sk_buff *skb, unsigned int final) 738 { 739 struct sk_buff *skb1 = NULL; 740 struct sock *sk; 741 unsigned int i; 742 743 for (i = 0; i < count; i++) { 744 sk = stack[i]; 745 if (likely(skb1 == NULL)) 746 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 747 if (!skb1) { 748 atomic_inc(&sk->sk_drops); 749 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 750 IS_UDPLITE(sk)); 751 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 752 IS_UDPLITE(sk)); 753 } 754 755 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 756 skb1 = NULL; 757 } 758 if (unlikely(skb1)) 759 kfree_skb(skb1); 760 } 761 /* 762 * Note: called only from the BH handler context, 763 * so we don't need to lock the hashes. 764 */ 765 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 766 const struct in6_addr *saddr, const struct in6_addr *daddr, 767 struct udp_table *udptable) 768 { 769 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 770 const struct udphdr *uh = udp_hdr(skb); 771 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 772 int dif; 773 unsigned int i, count = 0; 774 775 spin_lock(&hslot->lock); 776 sk = sk_nulls_head(&hslot->head); 777 dif = inet6_iif(skb); 778 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 779 while (sk) { 780 stack[count++] = sk; 781 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 782 uh->source, saddr, dif); 783 if (unlikely(count == ARRAY_SIZE(stack))) { 784 if (!sk) 785 break; 786 flush_stack(stack, count, skb, ~0); 787 count = 0; 788 } 789 } 790 /* 791 * before releasing the lock, we must take reference on sockets 792 */ 793 for (i = 0; i < count; i++) 794 sock_hold(stack[i]); 795 796 spin_unlock(&hslot->lock); 797 798 if (count) { 799 flush_stack(stack, count, skb, count - 1); 800 801 for (i = 0; i < count; i++) 802 sock_put(stack[i]); 803 } else { 804 kfree_skb(skb); 805 } 806 return 0; 807 } 808 809 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 810 int proto) 811 { 812 struct net *net = dev_net(skb->dev); 813 struct sock *sk; 814 struct udphdr *uh; 815 const struct in6_addr *saddr, *daddr; 816 u32 ulen = 0; 817 818 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 819 goto discard; 820 821 saddr = &ipv6_hdr(skb)->saddr; 822 daddr = &ipv6_hdr(skb)->daddr; 823 uh = udp_hdr(skb); 824 825 ulen = ntohs(uh->len); 826 if (ulen > skb->len) 827 goto short_packet; 828 829 if (proto == IPPROTO_UDP) { 830 /* UDP validates ulen. */ 831 832 /* Check for jumbo payload */ 833 if (ulen == 0) 834 ulen = skb->len; 835 836 if (ulen < sizeof(*uh)) 837 goto short_packet; 838 839 if (ulen < skb->len) { 840 if (pskb_trim_rcsum(skb, ulen)) 841 goto short_packet; 842 saddr = &ipv6_hdr(skb)->saddr; 843 daddr = &ipv6_hdr(skb)->daddr; 844 uh = udp_hdr(skb); 845 } 846 } 847 848 if (udp6_csum_init(skb, uh, proto)) 849 goto csum_error; 850 851 /* 852 * Multicast receive code 853 */ 854 if (ipv6_addr_is_multicast(daddr)) 855 return __udp6_lib_mcast_deliver(net, skb, 856 saddr, daddr, udptable); 857 858 /* Unicast */ 859 860 /* 861 * check socket cache ... must talk to Alan about his plans 862 * for sock caches... i'll skip this for now. 863 */ 864 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 865 if (sk != NULL) { 866 int ret; 867 868 ret = udpv6_queue_rcv_skb(sk, skb); 869 sock_put(sk); 870 871 /* a return value > 0 means to resubmit the input, but 872 * it wants the return to be -protocol, or 0 873 */ 874 if (ret > 0) 875 return -ret; 876 877 return 0; 878 } 879 880 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 881 goto discard; 882 883 if (udp_lib_checksum_complete(skb)) 884 goto csum_error; 885 886 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 887 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 888 889 kfree_skb(skb); 890 return 0; 891 892 short_packet: 893 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 894 proto == IPPROTO_UDPLITE ? "-Lite" : "", 895 saddr, 896 ntohs(uh->source), 897 ulen, 898 skb->len, 899 daddr, 900 ntohs(uh->dest)); 901 goto discard; 902 csum_error: 903 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 904 discard: 905 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 906 kfree_skb(skb); 907 return 0; 908 } 909 910 static __inline__ int udpv6_rcv(struct sk_buff *skb) 911 { 912 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 913 } 914 915 /* 916 * Throw away all pending data and cancel the corking. Socket is locked. 917 */ 918 static void udp_v6_flush_pending_frames(struct sock *sk) 919 { 920 struct udp_sock *up = udp_sk(sk); 921 922 if (up->pending == AF_INET) 923 udp_flush_pending_frames(sk); 924 else if (up->pending) { 925 up->len = 0; 926 up->pending = 0; 927 ip6_flush_pending_frames(sk); 928 } 929 } 930 931 /** 932 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 933 * @sk: socket we are sending on 934 * @skb: sk_buff containing the filled-in UDP header 935 * (checksum field must be zeroed out) 936 */ 937 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 938 const struct in6_addr *saddr, 939 const struct in6_addr *daddr, int len) 940 { 941 unsigned int offset; 942 struct udphdr *uh = udp_hdr(skb); 943 __wsum csum = 0; 944 945 if (skb_queue_len(&sk->sk_write_queue) == 1) { 946 /* Only one fragment on the socket. */ 947 skb->csum_start = skb_transport_header(skb) - skb->head; 948 skb->csum_offset = offsetof(struct udphdr, check); 949 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 950 } else { 951 /* 952 * HW-checksum won't work as there are two or more 953 * fragments on the socket so that all csums of sk_buffs 954 * should be together 955 */ 956 offset = skb_transport_offset(skb); 957 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 958 959 skb->ip_summed = CHECKSUM_NONE; 960 961 skb_queue_walk(&sk->sk_write_queue, skb) { 962 csum = csum_add(csum, skb->csum); 963 } 964 965 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 966 csum); 967 if (uh->check == 0) 968 uh->check = CSUM_MANGLED_0; 969 } 970 } 971 972 /* 973 * Sending 974 */ 975 976 static int udp_v6_push_pending_frames(struct sock *sk) 977 { 978 struct sk_buff *skb; 979 struct udphdr *uh; 980 struct udp_sock *up = udp_sk(sk); 981 struct inet_sock *inet = inet_sk(sk); 982 struct flowi6 *fl6; 983 int err = 0; 984 int is_udplite = IS_UDPLITE(sk); 985 __wsum csum = 0; 986 987 if (up->pending == AF_INET) 988 return udp_push_pending_frames(sk); 989 990 fl6 = &inet->cork.fl.u.ip6; 991 992 /* Grab the skbuff where UDP header space exists. */ 993 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 994 goto out; 995 996 /* 997 * Create a UDP header 998 */ 999 uh = udp_hdr(skb); 1000 uh->source = fl6->fl6_sport; 1001 uh->dest = fl6->fl6_dport; 1002 uh->len = htons(up->len); 1003 uh->check = 0; 1004 1005 if (is_udplite) 1006 csum = udplite_csum_outgoing(sk, skb); 1007 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 1008 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 1009 up->len); 1010 goto send; 1011 } else 1012 csum = udp_csum_outgoing(sk, skb); 1013 1014 /* add protocol-dependent pseudo-header */ 1015 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 1016 up->len, fl6->flowi6_proto, csum); 1017 if (uh->check == 0) 1018 uh->check = CSUM_MANGLED_0; 1019 1020 send: 1021 err = ip6_push_pending_frames(sk); 1022 if (err) { 1023 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 1024 UDP6_INC_STATS_USER(sock_net(sk), 1025 UDP_MIB_SNDBUFERRORS, is_udplite); 1026 err = 0; 1027 } 1028 } else 1029 UDP6_INC_STATS_USER(sock_net(sk), 1030 UDP_MIB_OUTDATAGRAMS, is_udplite); 1031 out: 1032 up->len = 0; 1033 up->pending = 0; 1034 return err; 1035 } 1036 1037 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 1038 struct msghdr *msg, size_t len) 1039 { 1040 struct ipv6_txoptions opt_space; 1041 struct udp_sock *up = udp_sk(sk); 1042 struct inet_sock *inet = inet_sk(sk); 1043 struct ipv6_pinfo *np = inet6_sk(sk); 1044 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 1045 struct in6_addr *daddr, *final_p, final; 1046 struct ipv6_txoptions *opt = NULL; 1047 struct ip6_flowlabel *flowlabel = NULL; 1048 struct flowi6 fl6; 1049 struct dst_entry *dst; 1050 int addr_len = msg->msg_namelen; 1051 int ulen = len; 1052 int hlimit = -1; 1053 int tclass = -1; 1054 int dontfrag = -1; 1055 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1056 int err; 1057 int connected = 0; 1058 int is_udplite = IS_UDPLITE(sk); 1059 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1060 1061 /* destination address check */ 1062 if (sin6) { 1063 if (addr_len < offsetof(struct sockaddr, sa_data)) 1064 return -EINVAL; 1065 1066 switch (sin6->sin6_family) { 1067 case AF_INET6: 1068 if (addr_len < SIN6_LEN_RFC2133) 1069 return -EINVAL; 1070 daddr = &sin6->sin6_addr; 1071 break; 1072 case AF_INET: 1073 goto do_udp_sendmsg; 1074 case AF_UNSPEC: 1075 msg->msg_name = sin6 = NULL; 1076 msg->msg_namelen = addr_len = 0; 1077 daddr = NULL; 1078 break; 1079 default: 1080 return -EINVAL; 1081 } 1082 } else if (!up->pending) { 1083 if (sk->sk_state != TCP_ESTABLISHED) 1084 return -EDESTADDRREQ; 1085 daddr = &sk->sk_v6_daddr; 1086 } else 1087 daddr = NULL; 1088 1089 if (daddr) { 1090 if (ipv6_addr_v4mapped(daddr)) { 1091 struct sockaddr_in sin; 1092 sin.sin_family = AF_INET; 1093 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1094 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1095 msg->msg_name = &sin; 1096 msg->msg_namelen = sizeof(sin); 1097 do_udp_sendmsg: 1098 if (__ipv6_only_sock(sk)) 1099 return -ENETUNREACH; 1100 return udp_sendmsg(iocb, sk, msg, len); 1101 } 1102 } 1103 1104 if (up->pending == AF_INET) 1105 return udp_sendmsg(iocb, sk, msg, len); 1106 1107 /* Rough check on arithmetic overflow, 1108 better check is made in ip6_append_data(). 1109 */ 1110 if (len > INT_MAX - sizeof(struct udphdr)) 1111 return -EMSGSIZE; 1112 1113 if (up->pending) { 1114 /* 1115 * There are pending frames. 1116 * The socket lock must be held while it's corked. 1117 */ 1118 lock_sock(sk); 1119 if (likely(up->pending)) { 1120 if (unlikely(up->pending != AF_INET6)) { 1121 release_sock(sk); 1122 return -EAFNOSUPPORT; 1123 } 1124 dst = NULL; 1125 goto do_append_data; 1126 } 1127 release_sock(sk); 1128 } 1129 ulen += sizeof(struct udphdr); 1130 1131 memset(&fl6, 0, sizeof(fl6)); 1132 1133 if (sin6) { 1134 if (sin6->sin6_port == 0) 1135 return -EINVAL; 1136 1137 fl6.fl6_dport = sin6->sin6_port; 1138 daddr = &sin6->sin6_addr; 1139 1140 if (np->sndflow) { 1141 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1142 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1143 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1144 if (flowlabel == NULL) 1145 return -EINVAL; 1146 } 1147 } 1148 1149 /* 1150 * Otherwise it will be difficult to maintain 1151 * sk->sk_dst_cache. 1152 */ 1153 if (sk->sk_state == TCP_ESTABLISHED && 1154 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1155 daddr = &sk->sk_v6_daddr; 1156 1157 if (addr_len >= sizeof(struct sockaddr_in6) && 1158 sin6->sin6_scope_id && 1159 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1160 fl6.flowi6_oif = sin6->sin6_scope_id; 1161 } else { 1162 if (sk->sk_state != TCP_ESTABLISHED) 1163 return -EDESTADDRREQ; 1164 1165 fl6.fl6_dport = inet->inet_dport; 1166 daddr = &sk->sk_v6_daddr; 1167 fl6.flowlabel = np->flow_label; 1168 connected = 1; 1169 } 1170 1171 if (!fl6.flowi6_oif) 1172 fl6.flowi6_oif = sk->sk_bound_dev_if; 1173 1174 if (!fl6.flowi6_oif) 1175 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1176 1177 fl6.flowi6_mark = sk->sk_mark; 1178 1179 if (msg->msg_controllen) { 1180 opt = &opt_space; 1181 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1182 opt->tot_len = sizeof(*opt); 1183 1184 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1185 &hlimit, &tclass, &dontfrag); 1186 if (err < 0) { 1187 fl6_sock_release(flowlabel); 1188 return err; 1189 } 1190 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1191 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1192 if (flowlabel == NULL) 1193 return -EINVAL; 1194 } 1195 if (!(opt->opt_nflen|opt->opt_flen)) 1196 opt = NULL; 1197 connected = 0; 1198 } 1199 if (opt == NULL) 1200 opt = np->opt; 1201 if (flowlabel) 1202 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1203 opt = ipv6_fixup_options(&opt_space, opt); 1204 1205 fl6.flowi6_proto = sk->sk_protocol; 1206 if (!ipv6_addr_any(daddr)) 1207 fl6.daddr = *daddr; 1208 else 1209 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1210 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1211 fl6.saddr = np->saddr; 1212 fl6.fl6_sport = inet->inet_sport; 1213 1214 final_p = fl6_update_dst(&fl6, opt, &final); 1215 if (final_p) 1216 connected = 0; 1217 1218 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1219 fl6.flowi6_oif = np->mcast_oif; 1220 connected = 0; 1221 } else if (!fl6.flowi6_oif) 1222 fl6.flowi6_oif = np->ucast_oif; 1223 1224 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1225 1226 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 1227 if (IS_ERR(dst)) { 1228 err = PTR_ERR(dst); 1229 dst = NULL; 1230 goto out; 1231 } 1232 1233 if (hlimit < 0) { 1234 if (ipv6_addr_is_multicast(&fl6.daddr)) 1235 hlimit = np->mcast_hops; 1236 else 1237 hlimit = np->hop_limit; 1238 if (hlimit < 0) 1239 hlimit = ip6_dst_hoplimit(dst); 1240 } 1241 1242 if (tclass < 0) 1243 tclass = np->tclass; 1244 1245 if (msg->msg_flags&MSG_CONFIRM) 1246 goto do_confirm; 1247 back_from_confirm: 1248 1249 lock_sock(sk); 1250 if (unlikely(up->pending)) { 1251 /* The socket is already corked while preparing it. */ 1252 /* ... which is an evident application bug. --ANK */ 1253 release_sock(sk); 1254 1255 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1256 err = -EINVAL; 1257 goto out; 1258 } 1259 1260 up->pending = AF_INET6; 1261 1262 do_append_data: 1263 if (dontfrag < 0) 1264 dontfrag = np->dontfrag; 1265 up->len += ulen; 1266 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1267 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1268 sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1269 (struct rt6_info*)dst, 1270 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1271 if (err) 1272 udp_v6_flush_pending_frames(sk); 1273 else if (!corkreq) 1274 err = udp_v6_push_pending_frames(sk); 1275 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1276 up->pending = 0; 1277 1278 if (dst) { 1279 if (connected) { 1280 ip6_dst_store(sk, dst, 1281 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1282 &sk->sk_v6_daddr : NULL, 1283 #ifdef CONFIG_IPV6_SUBTREES 1284 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1285 &np->saddr : 1286 #endif 1287 NULL); 1288 } else { 1289 dst_release(dst); 1290 } 1291 dst = NULL; 1292 } 1293 1294 if (err > 0) 1295 err = np->recverr ? net_xmit_errno(err) : 0; 1296 release_sock(sk); 1297 out: 1298 dst_release(dst); 1299 fl6_sock_release(flowlabel); 1300 if (!err) 1301 return len; 1302 /* 1303 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1304 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1305 * we don't have a good statistic (IpOutDiscards but it can be too many 1306 * things). We could add another new stat but at least for now that 1307 * seems like overkill. 1308 */ 1309 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1310 UDP6_INC_STATS_USER(sock_net(sk), 1311 UDP_MIB_SNDBUFERRORS, is_udplite); 1312 } 1313 return err; 1314 1315 do_confirm: 1316 dst_confirm(dst); 1317 if (!(msg->msg_flags&MSG_PROBE) || len) 1318 goto back_from_confirm; 1319 err = 0; 1320 goto out; 1321 } 1322 1323 void udpv6_destroy_sock(struct sock *sk) 1324 { 1325 struct udp_sock *up = udp_sk(sk); 1326 lock_sock(sk); 1327 udp_v6_flush_pending_frames(sk); 1328 release_sock(sk); 1329 1330 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1331 void (*encap_destroy)(struct sock *sk); 1332 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1333 if (encap_destroy) 1334 encap_destroy(sk); 1335 } 1336 1337 inet6_destroy_sock(sk); 1338 } 1339 1340 /* 1341 * Socket option code for UDP 1342 */ 1343 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1344 char __user *optval, unsigned int optlen) 1345 { 1346 if (level == SOL_UDP || level == SOL_UDPLITE) 1347 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1348 udp_v6_push_pending_frames); 1349 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1350 } 1351 1352 #ifdef CONFIG_COMPAT 1353 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1354 char __user *optval, unsigned int optlen) 1355 { 1356 if (level == SOL_UDP || level == SOL_UDPLITE) 1357 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1358 udp_v6_push_pending_frames); 1359 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1360 } 1361 #endif 1362 1363 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1364 char __user *optval, int __user *optlen) 1365 { 1366 if (level == SOL_UDP || level == SOL_UDPLITE) 1367 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1368 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1369 } 1370 1371 #ifdef CONFIG_COMPAT 1372 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1373 char __user *optval, int __user *optlen) 1374 { 1375 if (level == SOL_UDP || level == SOL_UDPLITE) 1376 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1377 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1378 } 1379 #endif 1380 1381 static const struct inet6_protocol udpv6_protocol = { 1382 .handler = udpv6_rcv, 1383 .err_handler = udpv6_err, 1384 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1385 }; 1386 1387 /* ------------------------------------------------------------------------ */ 1388 #ifdef CONFIG_PROC_FS 1389 int udp6_seq_show(struct seq_file *seq, void *v) 1390 { 1391 if (v == SEQ_START_TOKEN) { 1392 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1393 } else { 1394 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1395 struct inet_sock *inet = inet_sk(v); 1396 __u16 srcp = ntohs(inet->inet_sport); 1397 __u16 destp = ntohs(inet->inet_dport); 1398 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 1399 } 1400 return 0; 1401 } 1402 1403 static const struct file_operations udp6_afinfo_seq_fops = { 1404 .owner = THIS_MODULE, 1405 .open = udp_seq_open, 1406 .read = seq_read, 1407 .llseek = seq_lseek, 1408 .release = seq_release_net 1409 }; 1410 1411 static struct udp_seq_afinfo udp6_seq_afinfo = { 1412 .name = "udp6", 1413 .family = AF_INET6, 1414 .udp_table = &udp_table, 1415 .seq_fops = &udp6_afinfo_seq_fops, 1416 .seq_ops = { 1417 .show = udp6_seq_show, 1418 }, 1419 }; 1420 1421 int __net_init udp6_proc_init(struct net *net) 1422 { 1423 return udp_proc_register(net, &udp6_seq_afinfo); 1424 } 1425 1426 void udp6_proc_exit(struct net *net) { 1427 udp_proc_unregister(net, &udp6_seq_afinfo); 1428 } 1429 #endif /* CONFIG_PROC_FS */ 1430 1431 void udp_v6_clear_sk(struct sock *sk, int size) 1432 { 1433 struct inet_sock *inet = inet_sk(sk); 1434 1435 /* we do not want to clear pinet6 field, because of RCU lookups */ 1436 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1437 1438 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1439 memset(&inet->pinet6 + 1, 0, size); 1440 } 1441 1442 /* ------------------------------------------------------------------------ */ 1443 1444 struct proto udpv6_prot = { 1445 .name = "UDPv6", 1446 .owner = THIS_MODULE, 1447 .close = udp_lib_close, 1448 .connect = ip6_datagram_connect, 1449 .disconnect = udp_disconnect, 1450 .ioctl = udp_ioctl, 1451 .destroy = udpv6_destroy_sock, 1452 .setsockopt = udpv6_setsockopt, 1453 .getsockopt = udpv6_getsockopt, 1454 .sendmsg = udpv6_sendmsg, 1455 .recvmsg = udpv6_recvmsg, 1456 .backlog_rcv = __udpv6_queue_rcv_skb, 1457 .hash = udp_lib_hash, 1458 .unhash = udp_lib_unhash, 1459 .rehash = udp_v6_rehash, 1460 .get_port = udp_v6_get_port, 1461 .memory_allocated = &udp_memory_allocated, 1462 .sysctl_mem = sysctl_udp_mem, 1463 .sysctl_wmem = &sysctl_udp_wmem_min, 1464 .sysctl_rmem = &sysctl_udp_rmem_min, 1465 .obj_size = sizeof(struct udp6_sock), 1466 .slab_flags = SLAB_DESTROY_BY_RCU, 1467 .h.udp_table = &udp_table, 1468 #ifdef CONFIG_COMPAT 1469 .compat_setsockopt = compat_udpv6_setsockopt, 1470 .compat_getsockopt = compat_udpv6_getsockopt, 1471 #endif 1472 .clear_sk = udp_v6_clear_sk, 1473 }; 1474 1475 static struct inet_protosw udpv6_protosw = { 1476 .type = SOCK_DGRAM, 1477 .protocol = IPPROTO_UDP, 1478 .prot = &udpv6_prot, 1479 .ops = &inet6_dgram_ops, 1480 .no_check = UDP_CSUM_DEFAULT, 1481 .flags = INET_PROTOSW_PERMANENT, 1482 }; 1483 1484 1485 int __init udpv6_init(void) 1486 { 1487 int ret; 1488 1489 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1490 if (ret) 1491 goto out; 1492 1493 ret = inet6_register_protosw(&udpv6_protosw); 1494 if (ret) 1495 goto out_udpv6_protocol; 1496 out: 1497 return ret; 1498 1499 out_udpv6_protocol: 1500 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1501 goto out; 1502 } 1503 1504 void udpv6_exit(void) 1505 { 1506 inet6_unregister_protosw(&udpv6_protosw); 1507 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1508 } 1509