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 <linux/uaccess.h> 39 40 #include <net/addrconf.h> 41 #include <net/ndisc.h> 42 #include <net/protocol.h> 43 #include <net/transp_v6.h> 44 #include <net/ip6_route.h> 45 #include <net/raw.h> 46 #include <net/tcp_states.h> 47 #include <net/ip6_checksum.h> 48 #include <net/xfrm.h> 49 #include <net/inet6_hashtables.h> 50 #include <net/busy_poll.h> 51 #include <net/sock_reuseport.h> 52 53 #include <linux/proc_fs.h> 54 #include <linux/seq_file.h> 55 #include <trace/events/skb.h> 56 #include "udp_impl.h" 57 58 static u32 udp6_ehashfn(const struct net *net, 59 const struct in6_addr *laddr, 60 const u16 lport, 61 const struct in6_addr *faddr, 62 const __be16 fport) 63 { 64 static u32 udp6_ehash_secret __read_mostly; 65 static u32 udp_ipv6_hash_secret __read_mostly; 66 67 u32 lhash, fhash; 68 69 net_get_random_once(&udp6_ehash_secret, 70 sizeof(udp6_ehash_secret)); 71 net_get_random_once(&udp_ipv6_hash_secret, 72 sizeof(udp_ipv6_hash_secret)); 73 74 lhash = (__force u32)laddr->s6_addr32[3]; 75 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); 76 77 return __inet6_ehashfn(lhash, lport, fhash, fport, 78 udp_ipv6_hash_secret + net_hash_mix(net)); 79 } 80 81 static u32 udp6_portaddr_hash(const struct net *net, 82 const struct in6_addr *addr6, 83 unsigned int port) 84 { 85 unsigned int hash, mix = net_hash_mix(net); 86 87 if (ipv6_addr_any(addr6)) 88 hash = jhash_1word(0, mix); 89 else if (ipv6_addr_v4mapped(addr6)) 90 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 91 else 92 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 93 94 return hash ^ port; 95 } 96 97 int udp_v6_get_port(struct sock *sk, unsigned short snum) 98 { 99 unsigned int hash2_nulladdr = 100 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 101 unsigned int hash2_partial = 102 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); 103 104 /* precompute partial secondary hash */ 105 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 106 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 107 } 108 109 static void udp_v6_rehash(struct sock *sk) 110 { 111 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 112 &sk->sk_v6_rcv_saddr, 113 inet_sk(sk)->inet_num); 114 115 udp_lib_rehash(sk, new_hash); 116 } 117 118 static int compute_score(struct sock *sk, struct net *net, 119 const struct in6_addr *saddr, __be16 sport, 120 const struct in6_addr *daddr, unsigned short hnum, 121 int dif) 122 { 123 int score; 124 struct inet_sock *inet; 125 126 if (!net_eq(sock_net(sk), net) || 127 udp_sk(sk)->udp_port_hash != hnum || 128 sk->sk_family != PF_INET6) 129 return -1; 130 131 score = 0; 132 inet = inet_sk(sk); 133 134 if (inet->inet_dport) { 135 if (inet->inet_dport != sport) 136 return -1; 137 score++; 138 } 139 140 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 141 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 142 return -1; 143 score++; 144 } 145 146 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 147 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) 148 return -1; 149 score++; 150 } 151 152 if (sk->sk_bound_dev_if) { 153 if (sk->sk_bound_dev_if != dif) 154 return -1; 155 score++; 156 } 157 158 if (sk->sk_incoming_cpu == raw_smp_processor_id()) 159 score++; 160 161 return score; 162 } 163 164 /* called with rcu_read_lock() */ 165 static struct sock *udp6_lib_lookup2(struct net *net, 166 const struct in6_addr *saddr, __be16 sport, 167 const struct in6_addr *daddr, unsigned int hnum, int dif, 168 struct udp_hslot *hslot2, 169 struct sk_buff *skb) 170 { 171 struct sock *sk, *result; 172 int score, badness, matches = 0, reuseport = 0; 173 u32 hash = 0; 174 175 result = NULL; 176 badness = -1; 177 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { 178 score = compute_score(sk, net, saddr, sport, 179 daddr, hnum, dif); 180 if (score > badness) { 181 reuseport = sk->sk_reuseport; 182 if (reuseport) { 183 hash = udp6_ehashfn(net, daddr, hnum, 184 saddr, sport); 185 186 result = reuseport_select_sock(sk, hash, skb, 187 sizeof(struct udphdr)); 188 if (result) 189 return result; 190 matches = 1; 191 } 192 result = sk; 193 badness = score; 194 } else if (score == badness && reuseport) { 195 matches++; 196 if (reciprocal_scale(hash, matches) == 0) 197 result = sk; 198 hash = next_pseudo_random32(hash); 199 } 200 } 201 return result; 202 } 203 204 /* rcu_read_lock() must be held */ 205 struct sock *__udp6_lib_lookup(struct net *net, 206 const struct in6_addr *saddr, __be16 sport, 207 const struct in6_addr *daddr, __be16 dport, 208 int dif, struct udp_table *udptable, 209 struct sk_buff *skb) 210 { 211 struct sock *sk, *result; 212 unsigned short hnum = ntohs(dport); 213 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 214 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 215 int score, badness, matches = 0, reuseport = 0; 216 u32 hash = 0; 217 218 if (hslot->count > 10) { 219 hash2 = udp6_portaddr_hash(net, daddr, hnum); 220 slot2 = hash2 & udptable->mask; 221 hslot2 = &udptable->hash2[slot2]; 222 if (hslot->count < hslot2->count) 223 goto begin; 224 225 result = udp6_lib_lookup2(net, saddr, sport, 226 daddr, hnum, dif, 227 hslot2, skb); 228 if (!result) { 229 unsigned int old_slot2 = slot2; 230 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 231 slot2 = hash2 & udptable->mask; 232 /* avoid searching the same slot again. */ 233 if (unlikely(slot2 == old_slot2)) 234 return result; 235 236 hslot2 = &udptable->hash2[slot2]; 237 if (hslot->count < hslot2->count) 238 goto begin; 239 240 result = udp6_lib_lookup2(net, saddr, sport, 241 daddr, hnum, dif, 242 hslot2, skb); 243 } 244 return result; 245 } 246 begin: 247 result = NULL; 248 badness = -1; 249 sk_for_each_rcu(sk, &hslot->head) { 250 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif); 251 if (score > badness) { 252 reuseport = sk->sk_reuseport; 253 if (reuseport) { 254 hash = udp6_ehashfn(net, daddr, hnum, 255 saddr, sport); 256 result = reuseport_select_sock(sk, hash, skb, 257 sizeof(struct udphdr)); 258 if (result) 259 return result; 260 matches = 1; 261 } 262 result = sk; 263 badness = score; 264 } else if (score == badness && reuseport) { 265 matches++; 266 if (reciprocal_scale(hash, matches) == 0) 267 result = sk; 268 hash = next_pseudo_random32(hash); 269 } 270 } 271 return result; 272 } 273 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 274 275 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 276 __be16 sport, __be16 dport, 277 struct udp_table *udptable) 278 { 279 const struct ipv6hdr *iph = ipv6_hdr(skb); 280 struct sock *sk; 281 282 sk = skb_steal_sock(skb); 283 if (unlikely(sk)) 284 return sk; 285 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 286 &iph->daddr, dport, inet6_iif(skb), 287 udptable, skb); 288 } 289 290 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, 291 __be16 sport, __be16 dport) 292 { 293 const struct ipv6hdr *iph = ipv6_hdr(skb); 294 295 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, 296 &iph->daddr, dport, inet6_iif(skb), 297 &udp_table, skb); 298 } 299 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); 300 301 /* Must be called under rcu_read_lock(). 302 * Does increment socket refcount. 303 */ 304 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ 305 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \ 306 IS_ENABLED(CONFIG_NF_SOCKET_IPV6) 307 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 308 const struct in6_addr *daddr, __be16 dport, int dif) 309 { 310 struct sock *sk; 311 312 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, 313 dif, &udp_table, NULL); 314 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) 315 sk = NULL; 316 return sk; 317 } 318 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 319 #endif 320 321 /* 322 * This should be easy, if there is something there we 323 * return it, otherwise we block. 324 */ 325 326 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 327 int noblock, int flags, int *addr_len) 328 { 329 struct ipv6_pinfo *np = inet6_sk(sk); 330 struct inet_sock *inet = inet_sk(sk); 331 struct sk_buff *skb; 332 unsigned int ulen, copied; 333 int peeked, peeking, off; 334 int err; 335 int is_udplite = IS_UDPLITE(sk); 336 bool checksum_valid = false; 337 int is_udp4; 338 339 if (flags & MSG_ERRQUEUE) 340 return ipv6_recv_error(sk, msg, len, addr_len); 341 342 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 343 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 344 345 try_again: 346 peeking = off = sk_peek_offset(sk, flags); 347 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); 348 if (!skb) 349 return err; 350 351 ulen = skb->len; 352 copied = len; 353 if (copied > ulen - off) 354 copied = ulen - off; 355 else if (copied < ulen) 356 msg->msg_flags |= MSG_TRUNC; 357 358 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 359 360 /* 361 * If checksum is needed at all, try to do it while copying the 362 * data. If the data is truncated, or if we only want a partial 363 * coverage checksum (UDP-Lite), do it before the copy. 364 */ 365 366 if (copied < ulen || peeking || 367 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { 368 checksum_valid = !udp_lib_checksum_complete(skb); 369 if (!checksum_valid) 370 goto csum_copy_err; 371 } 372 373 if (checksum_valid || skb_csum_unnecessary(skb)) 374 err = skb_copy_datagram_msg(skb, off, msg, copied); 375 else { 376 err = skb_copy_and_csum_datagram_msg(skb, off, msg); 377 if (err == -EINVAL) 378 goto csum_copy_err; 379 } 380 if (unlikely(err)) { 381 if (!peeked) { 382 atomic_inc(&sk->sk_drops); 383 if (is_udp4) 384 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 385 is_udplite); 386 else 387 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, 388 is_udplite); 389 } 390 kfree_skb(skb); 391 return err; 392 } 393 if (!peeked) { 394 if (is_udp4) 395 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 396 is_udplite); 397 else 398 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, 399 is_udplite); 400 } 401 402 sock_recv_ts_and_drops(msg, sk, skb); 403 404 /* Copy the address. */ 405 if (msg->msg_name) { 406 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 407 sin6->sin6_family = AF_INET6; 408 sin6->sin6_port = udp_hdr(skb)->source; 409 sin6->sin6_flowinfo = 0; 410 411 if (is_udp4) { 412 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 413 &sin6->sin6_addr); 414 sin6->sin6_scope_id = 0; 415 } else { 416 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 417 sin6->sin6_scope_id = 418 ipv6_iface_scope_id(&sin6->sin6_addr, 419 inet6_iif(skb)); 420 } 421 *addr_len = sizeof(*sin6); 422 } 423 424 if (np->rxopt.all) 425 ip6_datagram_recv_common_ctl(sk, msg, skb); 426 427 if (is_udp4) { 428 if (inet->cmsg_flags) 429 ip_cmsg_recv_offset(msg, sk, skb, 430 sizeof(struct udphdr), off); 431 } else { 432 if (np->rxopt.all) 433 ip6_datagram_recv_specific_ctl(sk, msg, skb); 434 } 435 436 err = copied; 437 if (flags & MSG_TRUNC) 438 err = ulen; 439 440 skb_consume_udp(sk, skb, peeking ? -err : err); 441 return err; 442 443 csum_copy_err: 444 if (!__sk_queue_drop_skb(sk, skb, flags)) { 445 if (is_udp4) { 446 UDP_INC_STATS(sock_net(sk), 447 UDP_MIB_CSUMERRORS, is_udplite); 448 UDP_INC_STATS(sock_net(sk), 449 UDP_MIB_INERRORS, is_udplite); 450 } else { 451 UDP6_INC_STATS(sock_net(sk), 452 UDP_MIB_CSUMERRORS, is_udplite); 453 UDP6_INC_STATS(sock_net(sk), 454 UDP_MIB_INERRORS, is_udplite); 455 } 456 } 457 kfree_skb(skb); 458 459 /* starting over for a new packet, but check if we need to yield */ 460 cond_resched(); 461 msg->msg_flags &= ~MSG_TRUNC; 462 goto try_again; 463 } 464 465 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 466 u8 type, u8 code, int offset, __be32 info, 467 struct udp_table *udptable) 468 { 469 struct ipv6_pinfo *np; 470 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 471 const struct in6_addr *saddr = &hdr->saddr; 472 const struct in6_addr *daddr = &hdr->daddr; 473 struct udphdr *uh = (struct udphdr *)(skb->data+offset); 474 struct sock *sk; 475 int harderr; 476 int err; 477 struct net *net = dev_net(skb->dev); 478 479 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, 480 inet6_iif(skb), udptable, skb); 481 if (!sk) { 482 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), 483 ICMP6_MIB_INERRORS); 484 return; 485 } 486 487 harderr = icmpv6_err_convert(type, code, &err); 488 np = inet6_sk(sk); 489 490 if (type == ICMPV6_PKT_TOOBIG) { 491 if (!ip6_sk_accept_pmtu(sk)) 492 goto out; 493 ip6_sk_update_pmtu(skb, sk, info); 494 if (np->pmtudisc != IPV6_PMTUDISC_DONT) 495 harderr = 1; 496 } 497 if (type == NDISC_REDIRECT) { 498 ip6_sk_redirect(skb, sk); 499 goto out; 500 } 501 502 if (!np->recverr) { 503 if (!harderr || sk->sk_state != TCP_ESTABLISHED) 504 goto out; 505 } else { 506 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 507 } 508 509 sk->sk_err = err; 510 sk->sk_error_report(sk); 511 out: 512 return; 513 } 514 515 int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 516 { 517 int rc; 518 519 if (!ipv6_addr_any(&sk->sk_v6_daddr)) { 520 sock_rps_save_rxhash(sk, skb); 521 sk_mark_napi_id(sk, skb); 522 sk_incoming_cpu_update(sk); 523 } else { 524 sk_mark_napi_id_once(sk, skb); 525 } 526 527 rc = __udp_enqueue_schedule_skb(sk, skb); 528 if (rc < 0) { 529 int is_udplite = IS_UDPLITE(sk); 530 531 /* Note that an ENOMEM error is charged twice */ 532 if (rc == -ENOMEM) 533 UDP6_INC_STATS(sock_net(sk), 534 UDP_MIB_RCVBUFERRORS, is_udplite); 535 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 536 kfree_skb(skb); 537 return -1; 538 } 539 540 return 0; 541 } 542 543 static __inline__ void udpv6_err(struct sk_buff *skb, 544 struct inet6_skb_parm *opt, u8 type, 545 u8 code, int offset, __be32 info) 546 { 547 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 548 } 549 550 static struct static_key udpv6_encap_needed __read_mostly; 551 void udpv6_encap_enable(void) 552 { 553 if (!static_key_enabled(&udpv6_encap_needed)) 554 static_key_slow_inc(&udpv6_encap_needed); 555 } 556 EXPORT_SYMBOL(udpv6_encap_enable); 557 558 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 559 { 560 struct udp_sock *up = udp_sk(sk); 561 int is_udplite = IS_UDPLITE(sk); 562 563 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 564 goto drop; 565 566 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 567 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 568 569 /* 570 * This is an encapsulation socket so pass the skb to 571 * the socket's udp_encap_rcv() hook. Otherwise, just 572 * fall through and pass this up the UDP socket. 573 * up->encap_rcv() returns the following value: 574 * =0 if skb was successfully passed to the encap 575 * handler or was discarded by it. 576 * >0 if skb should be passed on to UDP. 577 * <0 if skb should be resubmitted as proto -N 578 */ 579 580 /* if we're overly short, let UDP handle it */ 581 encap_rcv = ACCESS_ONCE(up->encap_rcv); 582 if (encap_rcv) { 583 int ret; 584 585 /* Verify checksum before giving to encap */ 586 if (udp_lib_checksum_complete(skb)) 587 goto csum_error; 588 589 ret = encap_rcv(sk, skb); 590 if (ret <= 0) { 591 __UDP_INC_STATS(sock_net(sk), 592 UDP_MIB_INDATAGRAMS, 593 is_udplite); 594 return -ret; 595 } 596 } 597 598 /* FALLTHROUGH -- it's a UDP Packet */ 599 } 600 601 /* 602 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 603 */ 604 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 605 606 if (up->pcrlen == 0) { /* full coverage was set */ 607 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", 608 UDP_SKB_CB(skb)->cscov, skb->len); 609 goto drop; 610 } 611 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 612 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", 613 UDP_SKB_CB(skb)->cscov, up->pcrlen); 614 goto drop; 615 } 616 } 617 618 if (rcu_access_pointer(sk->sk_filter) && 619 udp_lib_checksum_complete(skb)) 620 goto csum_error; 621 622 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) 623 goto drop; 624 625 udp_csum_pull_header(skb); 626 627 skb_dst_drop(skb); 628 629 return __udpv6_queue_rcv_skb(sk, skb); 630 631 csum_error: 632 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 633 drop: 634 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 635 atomic_inc(&sk->sk_drops); 636 kfree_skb(skb); 637 return -1; 638 } 639 640 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, 641 __be16 loc_port, const struct in6_addr *loc_addr, 642 __be16 rmt_port, const struct in6_addr *rmt_addr, 643 int dif, unsigned short hnum) 644 { 645 struct inet_sock *inet = inet_sk(sk); 646 647 if (!net_eq(sock_net(sk), net)) 648 return false; 649 650 if (udp_sk(sk)->udp_port_hash != hnum || 651 sk->sk_family != PF_INET6 || 652 (inet->inet_dport && inet->inet_dport != rmt_port) || 653 (!ipv6_addr_any(&sk->sk_v6_daddr) && 654 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 655 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || 656 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && 657 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) 658 return false; 659 if (!inet6_mc_check(sk, loc_addr, rmt_addr)) 660 return false; 661 return true; 662 } 663 664 static void udp6_csum_zero_error(struct sk_buff *skb) 665 { 666 /* RFC 2460 section 8.1 says that we SHOULD log 667 * this error. Well, it is reasonable. 668 */ 669 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", 670 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), 671 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); 672 } 673 674 /* 675 * Note: called only from the BH handler context, 676 * so we don't need to lock the hashes. 677 */ 678 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 679 const struct in6_addr *saddr, const struct in6_addr *daddr, 680 struct udp_table *udptable, int proto) 681 { 682 struct sock *sk, *first = NULL; 683 const struct udphdr *uh = udp_hdr(skb); 684 unsigned short hnum = ntohs(uh->dest); 685 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); 686 unsigned int offset = offsetof(typeof(*sk), sk_node); 687 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); 688 int dif = inet6_iif(skb); 689 struct hlist_node *node; 690 struct sk_buff *nskb; 691 692 if (use_hash2) { 693 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & 694 udptable->mask; 695 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask; 696 start_lookup: 697 hslot = &udptable->hash2[hash2]; 698 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); 699 } 700 701 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { 702 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, 703 uh->source, saddr, dif, hnum)) 704 continue; 705 /* If zero checksum and no_check is not on for 706 * the socket then skip it. 707 */ 708 if (!uh->check && !udp_sk(sk)->no_check6_rx) 709 continue; 710 if (!first) { 711 first = sk; 712 continue; 713 } 714 nskb = skb_clone(skb, GFP_ATOMIC); 715 if (unlikely(!nskb)) { 716 atomic_inc(&sk->sk_drops); 717 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, 718 IS_UDPLITE(sk)); 719 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, 720 IS_UDPLITE(sk)); 721 continue; 722 } 723 724 if (udpv6_queue_rcv_skb(sk, nskb) > 0) 725 consume_skb(nskb); 726 } 727 728 /* Also lookup *:port if we are using hash2 and haven't done so yet. */ 729 if (use_hash2 && hash2 != hash2_any) { 730 hash2 = hash2_any; 731 goto start_lookup; 732 } 733 734 if (first) { 735 if (udpv6_queue_rcv_skb(first, skb) > 0) 736 consume_skb(skb); 737 } else { 738 kfree_skb(skb); 739 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, 740 proto == IPPROTO_UDPLITE); 741 } 742 return 0; 743 } 744 745 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 746 int proto) 747 { 748 const struct in6_addr *saddr, *daddr; 749 struct net *net = dev_net(skb->dev); 750 struct udphdr *uh; 751 struct sock *sk; 752 u32 ulen = 0; 753 754 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 755 goto discard; 756 757 saddr = &ipv6_hdr(skb)->saddr; 758 daddr = &ipv6_hdr(skb)->daddr; 759 uh = udp_hdr(skb); 760 761 ulen = ntohs(uh->len); 762 if (ulen > skb->len) 763 goto short_packet; 764 765 if (proto == IPPROTO_UDP) { 766 /* UDP validates ulen. */ 767 768 /* Check for jumbo payload */ 769 if (ulen == 0) 770 ulen = skb->len; 771 772 if (ulen < sizeof(*uh)) 773 goto short_packet; 774 775 if (ulen < skb->len) { 776 if (pskb_trim_rcsum(skb, ulen)) 777 goto short_packet; 778 saddr = &ipv6_hdr(skb)->saddr; 779 daddr = &ipv6_hdr(skb)->daddr; 780 uh = udp_hdr(skb); 781 } 782 } 783 784 if (udp6_csum_init(skb, uh, proto)) 785 goto csum_error; 786 787 /* 788 * Multicast receive code 789 */ 790 if (ipv6_addr_is_multicast(daddr)) 791 return __udp6_lib_mcast_deliver(net, skb, 792 saddr, daddr, udptable, proto); 793 794 /* Unicast */ 795 796 /* 797 * check socket cache ... must talk to Alan about his plans 798 * for sock caches... i'll skip this for now. 799 */ 800 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 801 if (sk) { 802 int ret; 803 804 if (!uh->check && !udp_sk(sk)->no_check6_rx) { 805 udp6_csum_zero_error(skb); 806 goto csum_error; 807 } 808 809 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) 810 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, 811 ip6_compute_pseudo); 812 813 ret = udpv6_queue_rcv_skb(sk, skb); 814 815 /* a return value > 0 means to resubmit the input */ 816 if (ret > 0) 817 return ret; 818 819 return 0; 820 } 821 822 if (!uh->check) { 823 udp6_csum_zero_error(skb); 824 goto csum_error; 825 } 826 827 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 828 goto discard; 829 830 if (udp_lib_checksum_complete(skb)) 831 goto csum_error; 832 833 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 834 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 835 836 kfree_skb(skb); 837 return 0; 838 839 short_packet: 840 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 841 proto == IPPROTO_UDPLITE ? "-Lite" : "", 842 saddr, ntohs(uh->source), 843 ulen, skb->len, 844 daddr, ntohs(uh->dest)); 845 goto discard; 846 csum_error: 847 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 848 discard: 849 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 850 kfree_skb(skb); 851 return 0; 852 } 853 854 static __inline__ int udpv6_rcv(struct sk_buff *skb) 855 { 856 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 857 } 858 859 /* 860 * Throw away all pending data and cancel the corking. Socket is locked. 861 */ 862 static void udp_v6_flush_pending_frames(struct sock *sk) 863 { 864 struct udp_sock *up = udp_sk(sk); 865 866 if (up->pending == AF_INET) 867 udp_flush_pending_frames(sk); 868 else if (up->pending) { 869 up->len = 0; 870 up->pending = 0; 871 ip6_flush_pending_frames(sk); 872 } 873 } 874 875 /** 876 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 877 * @sk: socket we are sending on 878 * @skb: sk_buff containing the filled-in UDP header 879 * (checksum field must be zeroed out) 880 */ 881 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 882 const struct in6_addr *saddr, 883 const struct in6_addr *daddr, int len) 884 { 885 unsigned int offset; 886 struct udphdr *uh = udp_hdr(skb); 887 struct sk_buff *frags = skb_shinfo(skb)->frag_list; 888 __wsum csum = 0; 889 890 if (!frags) { 891 /* Only one fragment on the socket. */ 892 skb->csum_start = skb_transport_header(skb) - skb->head; 893 skb->csum_offset = offsetof(struct udphdr, check); 894 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 895 } else { 896 /* 897 * HW-checksum won't work as there are two or more 898 * fragments on the socket so that all csums of sk_buffs 899 * should be together 900 */ 901 offset = skb_transport_offset(skb); 902 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 903 904 skb->ip_summed = CHECKSUM_NONE; 905 906 do { 907 csum = csum_add(csum, frags->csum); 908 } while ((frags = frags->next)); 909 910 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 911 csum); 912 if (uh->check == 0) 913 uh->check = CSUM_MANGLED_0; 914 } 915 } 916 917 /* 918 * Sending 919 */ 920 921 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) 922 { 923 struct sock *sk = skb->sk; 924 struct udphdr *uh; 925 int err = 0; 926 int is_udplite = IS_UDPLITE(sk); 927 __wsum csum = 0; 928 int offset = skb_transport_offset(skb); 929 int len = skb->len - offset; 930 931 /* 932 * Create a UDP header 933 */ 934 uh = udp_hdr(skb); 935 uh->source = fl6->fl6_sport; 936 uh->dest = fl6->fl6_dport; 937 uh->len = htons(len); 938 uh->check = 0; 939 940 if (is_udplite) 941 csum = udplite_csum(skb); 942 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ 943 skb->ip_summed = CHECKSUM_NONE; 944 goto send; 945 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 946 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); 947 goto send; 948 } else 949 csum = udp_csum(skb); 950 951 /* add protocol-dependent pseudo-header */ 952 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 953 len, fl6->flowi6_proto, csum); 954 if (uh->check == 0) 955 uh->check = CSUM_MANGLED_0; 956 957 send: 958 err = ip6_send_skb(skb); 959 if (err) { 960 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 961 UDP6_INC_STATS(sock_net(sk), 962 UDP_MIB_SNDBUFERRORS, is_udplite); 963 err = 0; 964 } 965 } else { 966 UDP6_INC_STATS(sock_net(sk), 967 UDP_MIB_OUTDATAGRAMS, is_udplite); 968 } 969 return err; 970 } 971 972 static int udp_v6_push_pending_frames(struct sock *sk) 973 { 974 struct sk_buff *skb; 975 struct udp_sock *up = udp_sk(sk); 976 struct flowi6 fl6; 977 int err = 0; 978 979 if (up->pending == AF_INET) 980 return udp_push_pending_frames(sk); 981 982 /* ip6_finish_skb will release the cork, so make a copy of 983 * fl6 here. 984 */ 985 fl6 = inet_sk(sk)->cork.fl.u.ip6; 986 987 skb = ip6_finish_skb(sk); 988 if (!skb) 989 goto out; 990 991 err = udp_v6_send_skb(skb, &fl6); 992 993 out: 994 up->len = 0; 995 up->pending = 0; 996 return err; 997 } 998 999 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 1000 { 1001 struct ipv6_txoptions opt_space; 1002 struct udp_sock *up = udp_sk(sk); 1003 struct inet_sock *inet = inet_sk(sk); 1004 struct ipv6_pinfo *np = inet6_sk(sk); 1005 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 1006 struct in6_addr *daddr, *final_p, final; 1007 struct ipv6_txoptions *opt = NULL; 1008 struct ipv6_txoptions *opt_to_free = NULL; 1009 struct ip6_flowlabel *flowlabel = NULL; 1010 struct flowi6 fl6; 1011 struct dst_entry *dst; 1012 struct ipcm6_cookie ipc6; 1013 int addr_len = msg->msg_namelen; 1014 int ulen = len; 1015 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1016 int err; 1017 int connected = 0; 1018 int is_udplite = IS_UDPLITE(sk); 1019 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1020 struct sockcm_cookie sockc; 1021 1022 ipc6.hlimit = -1; 1023 ipc6.tclass = -1; 1024 ipc6.dontfrag = -1; 1025 1026 /* destination address check */ 1027 if (sin6) { 1028 if (addr_len < offsetof(struct sockaddr, sa_data)) 1029 return -EINVAL; 1030 1031 switch (sin6->sin6_family) { 1032 case AF_INET6: 1033 if (addr_len < SIN6_LEN_RFC2133) 1034 return -EINVAL; 1035 daddr = &sin6->sin6_addr; 1036 break; 1037 case AF_INET: 1038 goto do_udp_sendmsg; 1039 case AF_UNSPEC: 1040 msg->msg_name = sin6 = NULL; 1041 msg->msg_namelen = addr_len = 0; 1042 daddr = NULL; 1043 break; 1044 default: 1045 return -EINVAL; 1046 } 1047 } else if (!up->pending) { 1048 if (sk->sk_state != TCP_ESTABLISHED) 1049 return -EDESTADDRREQ; 1050 daddr = &sk->sk_v6_daddr; 1051 } else 1052 daddr = NULL; 1053 1054 if (daddr) { 1055 if (ipv6_addr_v4mapped(daddr)) { 1056 struct sockaddr_in sin; 1057 sin.sin_family = AF_INET; 1058 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1059 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1060 msg->msg_name = &sin; 1061 msg->msg_namelen = sizeof(sin); 1062 do_udp_sendmsg: 1063 if (__ipv6_only_sock(sk)) 1064 return -ENETUNREACH; 1065 return udp_sendmsg(sk, msg, len); 1066 } 1067 } 1068 1069 if (up->pending == AF_INET) 1070 return udp_sendmsg(sk, msg, len); 1071 1072 /* Rough check on arithmetic overflow, 1073 better check is made in ip6_append_data(). 1074 */ 1075 if (len > INT_MAX - sizeof(struct udphdr)) 1076 return -EMSGSIZE; 1077 1078 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1079 if (up->pending) { 1080 /* 1081 * There are pending frames. 1082 * The socket lock must be held while it's corked. 1083 */ 1084 lock_sock(sk); 1085 if (likely(up->pending)) { 1086 if (unlikely(up->pending != AF_INET6)) { 1087 release_sock(sk); 1088 return -EAFNOSUPPORT; 1089 } 1090 dst = NULL; 1091 goto do_append_data; 1092 } 1093 release_sock(sk); 1094 } 1095 ulen += sizeof(struct udphdr); 1096 1097 memset(&fl6, 0, sizeof(fl6)); 1098 1099 if (sin6) { 1100 if (sin6->sin6_port == 0) 1101 return -EINVAL; 1102 1103 fl6.fl6_dport = sin6->sin6_port; 1104 daddr = &sin6->sin6_addr; 1105 1106 if (np->sndflow) { 1107 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1108 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1109 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1110 if (!flowlabel) 1111 return -EINVAL; 1112 } 1113 } 1114 1115 /* 1116 * Otherwise it will be difficult to maintain 1117 * sk->sk_dst_cache. 1118 */ 1119 if (sk->sk_state == TCP_ESTABLISHED && 1120 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 1121 daddr = &sk->sk_v6_daddr; 1122 1123 if (addr_len >= sizeof(struct sockaddr_in6) && 1124 sin6->sin6_scope_id && 1125 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1126 fl6.flowi6_oif = sin6->sin6_scope_id; 1127 } else { 1128 if (sk->sk_state != TCP_ESTABLISHED) 1129 return -EDESTADDRREQ; 1130 1131 fl6.fl6_dport = inet->inet_dport; 1132 daddr = &sk->sk_v6_daddr; 1133 fl6.flowlabel = np->flow_label; 1134 connected = 1; 1135 } 1136 1137 if (!fl6.flowi6_oif) 1138 fl6.flowi6_oif = sk->sk_bound_dev_if; 1139 1140 if (!fl6.flowi6_oif) 1141 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1142 1143 fl6.flowi6_mark = sk->sk_mark; 1144 fl6.flowi6_uid = sk->sk_uid; 1145 sockc.tsflags = sk->sk_tsflags; 1146 1147 if (msg->msg_controllen) { 1148 opt = &opt_space; 1149 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1150 opt->tot_len = sizeof(*opt); 1151 ipc6.opt = opt; 1152 1153 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); 1154 if (err < 0) { 1155 fl6_sock_release(flowlabel); 1156 return err; 1157 } 1158 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1159 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1160 if (!flowlabel) 1161 return -EINVAL; 1162 } 1163 if (!(opt->opt_nflen|opt->opt_flen)) 1164 opt = NULL; 1165 connected = 0; 1166 } 1167 if (!opt) { 1168 opt = txopt_get(np); 1169 opt_to_free = opt; 1170 } 1171 if (flowlabel) 1172 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1173 opt = ipv6_fixup_options(&opt_space, opt); 1174 ipc6.opt = opt; 1175 1176 fl6.flowi6_proto = sk->sk_protocol; 1177 if (!ipv6_addr_any(daddr)) 1178 fl6.daddr = *daddr; 1179 else 1180 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1181 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1182 fl6.saddr = np->saddr; 1183 fl6.fl6_sport = inet->inet_sport; 1184 1185 final_p = fl6_update_dst(&fl6, opt, &final); 1186 if (final_p) 1187 connected = 0; 1188 1189 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1190 fl6.flowi6_oif = np->mcast_oif; 1191 connected = 0; 1192 } else if (!fl6.flowi6_oif) 1193 fl6.flowi6_oif = np->ucast_oif; 1194 1195 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1196 1197 if (ipc6.tclass < 0) 1198 ipc6.tclass = np->tclass; 1199 1200 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 1201 1202 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); 1203 if (IS_ERR(dst)) { 1204 err = PTR_ERR(dst); 1205 dst = NULL; 1206 goto out; 1207 } 1208 1209 if (ipc6.hlimit < 0) 1210 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1211 1212 if (msg->msg_flags&MSG_CONFIRM) 1213 goto do_confirm; 1214 back_from_confirm: 1215 1216 /* Lockless fast path for the non-corking case */ 1217 if (!corkreq) { 1218 struct sk_buff *skb; 1219 1220 skb = ip6_make_skb(sk, getfrag, msg, ulen, 1221 sizeof(struct udphdr), &ipc6, 1222 &fl6, (struct rt6_info *)dst, 1223 msg->msg_flags, &sockc); 1224 err = PTR_ERR(skb); 1225 if (!IS_ERR_OR_NULL(skb)) 1226 err = udp_v6_send_skb(skb, &fl6); 1227 goto release_dst; 1228 } 1229 1230 lock_sock(sk); 1231 if (unlikely(up->pending)) { 1232 /* The socket is already corked while preparing it. */ 1233 /* ... which is an evident application bug. --ANK */ 1234 release_sock(sk); 1235 1236 net_dbg_ratelimited("udp cork app bug 2\n"); 1237 err = -EINVAL; 1238 goto out; 1239 } 1240 1241 up->pending = AF_INET6; 1242 1243 do_append_data: 1244 if (ipc6.dontfrag < 0) 1245 ipc6.dontfrag = np->dontfrag; 1246 up->len += ulen; 1247 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), 1248 &ipc6, &fl6, (struct rt6_info *)dst, 1249 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); 1250 if (err) 1251 udp_v6_flush_pending_frames(sk); 1252 else if (!corkreq) 1253 err = udp_v6_push_pending_frames(sk); 1254 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1255 up->pending = 0; 1256 1257 if (err > 0) 1258 err = np->recverr ? net_xmit_errno(err) : 0; 1259 release_sock(sk); 1260 1261 release_dst: 1262 if (dst) { 1263 if (connected) { 1264 ip6_dst_store(sk, dst, 1265 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 1266 &sk->sk_v6_daddr : NULL, 1267 #ifdef CONFIG_IPV6_SUBTREES 1268 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1269 &np->saddr : 1270 #endif 1271 NULL); 1272 } else { 1273 dst_release(dst); 1274 } 1275 dst = NULL; 1276 } 1277 1278 out: 1279 dst_release(dst); 1280 fl6_sock_release(flowlabel); 1281 txopt_put(opt_to_free); 1282 if (!err) 1283 return len; 1284 /* 1285 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1286 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1287 * we don't have a good statistic (IpOutDiscards but it can be too many 1288 * things). We could add another new stat but at least for now that 1289 * seems like overkill. 1290 */ 1291 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1292 UDP6_INC_STATS(sock_net(sk), 1293 UDP_MIB_SNDBUFERRORS, is_udplite); 1294 } 1295 return err; 1296 1297 do_confirm: 1298 dst_confirm(dst); 1299 if (!(msg->msg_flags&MSG_PROBE) || len) 1300 goto back_from_confirm; 1301 err = 0; 1302 goto out; 1303 } 1304 1305 void udpv6_destroy_sock(struct sock *sk) 1306 { 1307 struct udp_sock *up = udp_sk(sk); 1308 lock_sock(sk); 1309 udp_v6_flush_pending_frames(sk); 1310 release_sock(sk); 1311 1312 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1313 void (*encap_destroy)(struct sock *sk); 1314 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1315 if (encap_destroy) 1316 encap_destroy(sk); 1317 } 1318 1319 inet6_destroy_sock(sk); 1320 } 1321 1322 /* 1323 * Socket option code for UDP 1324 */ 1325 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1326 char __user *optval, unsigned int optlen) 1327 { 1328 if (level == SOL_UDP || level == SOL_UDPLITE) 1329 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1330 udp_v6_push_pending_frames); 1331 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1332 } 1333 1334 #ifdef CONFIG_COMPAT 1335 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1336 char __user *optval, unsigned int optlen) 1337 { 1338 if (level == SOL_UDP || level == SOL_UDPLITE) 1339 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1340 udp_v6_push_pending_frames); 1341 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1342 } 1343 #endif 1344 1345 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1346 char __user *optval, int __user *optlen) 1347 { 1348 if (level == SOL_UDP || level == SOL_UDPLITE) 1349 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1350 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1351 } 1352 1353 #ifdef CONFIG_COMPAT 1354 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1355 char __user *optval, int __user *optlen) 1356 { 1357 if (level == SOL_UDP || level == SOL_UDPLITE) 1358 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1359 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1360 } 1361 #endif 1362 1363 static const struct inet6_protocol udpv6_protocol = { 1364 .handler = udpv6_rcv, 1365 .err_handler = udpv6_err, 1366 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1367 }; 1368 1369 /* ------------------------------------------------------------------------ */ 1370 #ifdef CONFIG_PROC_FS 1371 int udp6_seq_show(struct seq_file *seq, void *v) 1372 { 1373 if (v == SEQ_START_TOKEN) { 1374 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1375 } else { 1376 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1377 struct inet_sock *inet = inet_sk(v); 1378 __u16 srcp = ntohs(inet->inet_sport); 1379 __u16 destp = ntohs(inet->inet_dport); 1380 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 1381 } 1382 return 0; 1383 } 1384 1385 static const struct file_operations udp6_afinfo_seq_fops = { 1386 .owner = THIS_MODULE, 1387 .open = udp_seq_open, 1388 .read = seq_read, 1389 .llseek = seq_lseek, 1390 .release = seq_release_net 1391 }; 1392 1393 static struct udp_seq_afinfo udp6_seq_afinfo = { 1394 .name = "udp6", 1395 .family = AF_INET6, 1396 .udp_table = &udp_table, 1397 .seq_fops = &udp6_afinfo_seq_fops, 1398 .seq_ops = { 1399 .show = udp6_seq_show, 1400 }, 1401 }; 1402 1403 int __net_init udp6_proc_init(struct net *net) 1404 { 1405 return udp_proc_register(net, &udp6_seq_afinfo); 1406 } 1407 1408 void udp6_proc_exit(struct net *net) 1409 { 1410 udp_proc_unregister(net, &udp6_seq_afinfo); 1411 } 1412 #endif /* CONFIG_PROC_FS */ 1413 1414 /* ------------------------------------------------------------------------ */ 1415 1416 struct proto udpv6_prot = { 1417 .name = "UDPv6", 1418 .owner = THIS_MODULE, 1419 .close = udp_lib_close, 1420 .connect = ip6_datagram_connect, 1421 .disconnect = udp_disconnect, 1422 .ioctl = udp_ioctl, 1423 .init = udp_init_sock, 1424 .destroy = udpv6_destroy_sock, 1425 .setsockopt = udpv6_setsockopt, 1426 .getsockopt = udpv6_getsockopt, 1427 .sendmsg = udpv6_sendmsg, 1428 .recvmsg = udpv6_recvmsg, 1429 .release_cb = ip6_datagram_release_cb, 1430 .hash = udp_lib_hash, 1431 .unhash = udp_lib_unhash, 1432 .rehash = udp_v6_rehash, 1433 .get_port = udp_v6_get_port, 1434 .memory_allocated = &udp_memory_allocated, 1435 .sysctl_mem = sysctl_udp_mem, 1436 .sysctl_wmem = &sysctl_udp_wmem_min, 1437 .sysctl_rmem = &sysctl_udp_rmem_min, 1438 .obj_size = sizeof(struct udp6_sock), 1439 .h.udp_table = &udp_table, 1440 #ifdef CONFIG_COMPAT 1441 .compat_setsockopt = compat_udpv6_setsockopt, 1442 .compat_getsockopt = compat_udpv6_getsockopt, 1443 #endif 1444 .diag_destroy = udp_abort, 1445 }; 1446 1447 static struct inet_protosw udpv6_protosw = { 1448 .type = SOCK_DGRAM, 1449 .protocol = IPPROTO_UDP, 1450 .prot = &udpv6_prot, 1451 .ops = &inet6_dgram_ops, 1452 .flags = INET_PROTOSW_PERMANENT, 1453 }; 1454 1455 int __init udpv6_init(void) 1456 { 1457 int ret; 1458 1459 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1460 if (ret) 1461 goto out; 1462 1463 ret = inet6_register_protosw(&udpv6_protosw); 1464 if (ret) 1465 goto out_udpv6_protocol; 1466 out: 1467 return ret; 1468 1469 out_udpv6_protocol: 1470 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1471 goto out; 1472 } 1473 1474 void udpv6_exit(void) 1475 { 1476 inet6_unregister_protosw(&udpv6_protosw); 1477 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1478 } 1479