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 50 #include <linux/proc_fs.h> 51 #include <linux/seq_file.h> 52 #include <trace/events/skb.h> 53 #include "udp_impl.h" 54 55 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 56 { 57 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 58 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 59 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk); 60 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); 61 int sk_ipv6only = ipv6_only_sock(sk); 62 int sk2_ipv6only = inet_v6_ipv6only(sk2); 63 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 64 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 65 66 /* if both are mapped, treat as IPv4 */ 67 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 68 return (!sk2_ipv6only && 69 (!sk1_rcv_saddr || !sk2_rcv_saddr || 70 sk1_rcv_saddr == sk2_rcv_saddr)); 71 72 if (addr_type2 == IPV6_ADDR_ANY && 73 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 74 return 1; 75 76 if (addr_type == IPV6_ADDR_ANY && 77 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 78 return 1; 79 80 if (sk2_rcv_saddr6 && 81 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 82 return 1; 83 84 return 0; 85 } 86 87 static unsigned int udp6_portaddr_hash(struct net *net, 88 const struct in6_addr *addr6, 89 unsigned int port) 90 { 91 unsigned int hash, mix = net_hash_mix(net); 92 93 if (ipv6_addr_any(addr6)) 94 hash = jhash_1word(0, mix); 95 else if (ipv6_addr_v4mapped(addr6)) 96 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 97 else 98 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 99 100 return hash ^ port; 101 } 102 103 104 int udp_v6_get_port(struct sock *sk, unsigned short snum) 105 { 106 unsigned int hash2_nulladdr = 107 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 108 unsigned int hash2_partial = 109 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); 110 111 /* precompute partial secondary hash */ 112 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 113 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 114 } 115 116 static void udp_v6_rehash(struct sock *sk) 117 { 118 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 119 &inet6_sk(sk)->rcv_saddr, 120 inet_sk(sk)->inet_num); 121 122 udp_lib_rehash(sk, new_hash); 123 } 124 125 static inline int compute_score(struct sock *sk, struct net *net, 126 unsigned short hnum, 127 const struct in6_addr *saddr, __be16 sport, 128 const struct in6_addr *daddr, __be16 dport, 129 int dif) 130 { 131 int score = -1; 132 133 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 134 sk->sk_family == PF_INET6) { 135 struct ipv6_pinfo *np = inet6_sk(sk); 136 struct inet_sock *inet = inet_sk(sk); 137 138 score = 0; 139 if (inet->inet_dport) { 140 if (inet->inet_dport != sport) 141 return -1; 142 score++; 143 } 144 if (!ipv6_addr_any(&np->rcv_saddr)) { 145 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 146 return -1; 147 score++; 148 } 149 if (!ipv6_addr_any(&np->daddr)) { 150 if (!ipv6_addr_equal(&np->daddr, saddr)) 151 return -1; 152 score++; 153 } 154 if (sk->sk_bound_dev_if) { 155 if (sk->sk_bound_dev_if != dif) 156 return -1; 157 score++; 158 } 159 } 160 return score; 161 } 162 163 #define SCORE2_MAX (1 + 1 + 1) 164 static inline int compute_score2(struct sock *sk, struct net *net, 165 const struct in6_addr *saddr, __be16 sport, 166 const struct in6_addr *daddr, unsigned short hnum, 167 int dif) 168 { 169 int score = -1; 170 171 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 172 sk->sk_family == PF_INET6) { 173 struct ipv6_pinfo *np = inet6_sk(sk); 174 struct inet_sock *inet = inet_sk(sk); 175 176 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 177 return -1; 178 score = 0; 179 if (inet->inet_dport) { 180 if (inet->inet_dport != sport) 181 return -1; 182 score++; 183 } 184 if (!ipv6_addr_any(&np->daddr)) { 185 if (!ipv6_addr_equal(&np->daddr, saddr)) 186 return -1; 187 score++; 188 } 189 if (sk->sk_bound_dev_if) { 190 if (sk->sk_bound_dev_if != dif) 191 return -1; 192 score++; 193 } 194 } 195 return score; 196 } 197 198 199 /* called with read_rcu_lock() */ 200 static struct sock *udp6_lib_lookup2(struct net *net, 201 const struct in6_addr *saddr, __be16 sport, 202 const struct in6_addr *daddr, unsigned int hnum, int dif, 203 struct udp_hslot *hslot2, unsigned int slot2) 204 { 205 struct sock *sk, *result; 206 struct hlist_nulls_node *node; 207 int score, badness, matches = 0, reuseport = 0; 208 u32 hash = 0; 209 210 begin: 211 result = NULL; 212 badness = -1; 213 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 214 score = compute_score2(sk, net, saddr, sport, 215 daddr, hnum, dif); 216 if (score > badness) { 217 result = sk; 218 badness = score; 219 reuseport = sk->sk_reuseport; 220 if (reuseport) { 221 hash = inet6_ehashfn(net, daddr, hnum, 222 saddr, sport); 223 matches = 1; 224 } else if (score == SCORE2_MAX) 225 goto exact_match; 226 } else if (score == badness && reuseport) { 227 matches++; 228 if (((u64)hash * matches) >> 32 == 0) 229 result = sk; 230 hash = next_pseudo_random32(hash); 231 } 232 } 233 /* 234 * if the nulls value we got at the end of this lookup is 235 * not the expected one, we must restart lookup. 236 * We probably met an item that was moved to another chain. 237 */ 238 if (get_nulls_value(node) != slot2) 239 goto begin; 240 241 if (result) { 242 exact_match: 243 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 244 result = NULL; 245 else if (unlikely(compute_score2(result, net, saddr, sport, 246 daddr, hnum, dif) < badness)) { 247 sock_put(result); 248 goto begin; 249 } 250 } 251 return result; 252 } 253 254 struct sock *__udp6_lib_lookup(struct net *net, 255 const struct in6_addr *saddr, __be16 sport, 256 const struct in6_addr *daddr, __be16 dport, 257 int dif, struct udp_table *udptable) 258 { 259 struct sock *sk, *result; 260 struct hlist_nulls_node *node; 261 unsigned short hnum = ntohs(dport); 262 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 263 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 264 int score, badness, matches = 0, reuseport = 0; 265 u32 hash = 0; 266 267 rcu_read_lock(); 268 if (hslot->count > 10) { 269 hash2 = udp6_portaddr_hash(net, daddr, hnum); 270 slot2 = hash2 & udptable->mask; 271 hslot2 = &udptable->hash2[slot2]; 272 if (hslot->count < hslot2->count) 273 goto begin; 274 275 result = udp6_lib_lookup2(net, saddr, sport, 276 daddr, hnum, dif, 277 hslot2, slot2); 278 if (!result) { 279 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 280 slot2 = hash2 & udptable->mask; 281 hslot2 = &udptable->hash2[slot2]; 282 if (hslot->count < hslot2->count) 283 goto begin; 284 285 result = udp6_lib_lookup2(net, saddr, sport, 286 &in6addr_any, hnum, dif, 287 hslot2, slot2); 288 } 289 rcu_read_unlock(); 290 return result; 291 } 292 begin: 293 result = NULL; 294 badness = -1; 295 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 296 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 297 if (score > badness) { 298 result = sk; 299 badness = score; 300 reuseport = sk->sk_reuseport; 301 if (reuseport) { 302 hash = inet6_ehashfn(net, daddr, hnum, 303 saddr, sport); 304 matches = 1; 305 } 306 } else if (score == badness && reuseport) { 307 matches++; 308 if (((u64)hash * matches) >> 32 == 0) 309 result = sk; 310 hash = next_pseudo_random32(hash); 311 } 312 } 313 /* 314 * if the nulls value we got at the end of this lookup is 315 * not the expected one, we must restart lookup. 316 * We probably met an item that was moved to another chain. 317 */ 318 if (get_nulls_value(node) != slot) 319 goto begin; 320 321 if (result) { 322 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 323 result = NULL; 324 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 325 daddr, dport, dif) < badness)) { 326 sock_put(result); 327 goto begin; 328 } 329 } 330 rcu_read_unlock(); 331 return result; 332 } 333 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 334 335 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 336 __be16 sport, __be16 dport, 337 struct udp_table *udptable) 338 { 339 struct sock *sk; 340 const struct ipv6hdr *iph = ipv6_hdr(skb); 341 342 if (unlikely(sk = skb_steal_sock(skb))) 343 return sk; 344 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 345 &iph->daddr, dport, inet6_iif(skb), 346 udptable); 347 } 348 349 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 350 const struct in6_addr *daddr, __be16 dport, int dif) 351 { 352 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 353 } 354 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 355 356 357 /* 358 * This should be easy, if there is something there we 359 * return it, otherwise we block. 360 */ 361 362 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 363 struct msghdr *msg, size_t len, 364 int noblock, int flags, int *addr_len) 365 { 366 struct ipv6_pinfo *np = inet6_sk(sk); 367 struct inet_sock *inet = inet_sk(sk); 368 struct sk_buff *skb; 369 unsigned int ulen, copied; 370 int peeked, off = 0; 371 int err; 372 int is_udplite = IS_UDPLITE(sk); 373 int is_udp4; 374 bool slow; 375 376 if (addr_len) 377 *addr_len = sizeof(struct sockaddr_in6); 378 379 if (flags & MSG_ERRQUEUE) 380 return ipv6_recv_error(sk, msg, len); 381 382 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 383 return ipv6_recv_rxpmtu(sk, msg, len); 384 385 try_again: 386 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 387 &peeked, &off, &err); 388 if (!skb) 389 goto out; 390 391 ulen = skb->len - sizeof(struct udphdr); 392 copied = len; 393 if (copied > ulen) 394 copied = ulen; 395 else if (copied < ulen) 396 msg->msg_flags |= MSG_TRUNC; 397 398 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 399 400 /* 401 * If checksum is needed at all, try to do it while copying the 402 * data. If the data is truncated, or if we only want a partial 403 * coverage checksum (UDP-Lite), do it before the copy. 404 */ 405 406 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 407 if (udp_lib_checksum_complete(skb)) 408 goto csum_copy_err; 409 } 410 411 if (skb_csum_unnecessary(skb)) 412 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 413 msg->msg_iov, copied); 414 else { 415 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 416 if (err == -EINVAL) 417 goto csum_copy_err; 418 } 419 if (unlikely(err)) { 420 trace_kfree_skb(skb, udpv6_recvmsg); 421 if (!peeked) { 422 atomic_inc(&sk->sk_drops); 423 if (is_udp4) 424 UDP_INC_STATS_USER(sock_net(sk), 425 UDP_MIB_INERRORS, 426 is_udplite); 427 else 428 UDP6_INC_STATS_USER(sock_net(sk), 429 UDP_MIB_INERRORS, 430 is_udplite); 431 } 432 goto out_free; 433 } 434 if (!peeked) { 435 if (is_udp4) 436 UDP_INC_STATS_USER(sock_net(sk), 437 UDP_MIB_INDATAGRAMS, is_udplite); 438 else 439 UDP6_INC_STATS_USER(sock_net(sk), 440 UDP_MIB_INDATAGRAMS, is_udplite); 441 } 442 443 sock_recv_ts_and_drops(msg, sk, skb); 444 445 /* Copy the address. */ 446 if (msg->msg_name) { 447 struct sockaddr_in6 *sin6; 448 449 sin6 = (struct sockaddr_in6 *) msg->msg_name; 450 sin6->sin6_family = AF_INET6; 451 sin6->sin6_port = udp_hdr(skb)->source; 452 sin6->sin6_flowinfo = 0; 453 sin6->sin6_scope_id = 0; 454 455 if (is_udp4) 456 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 457 &sin6->sin6_addr); 458 else { 459 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 460 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 461 sin6->sin6_scope_id = IP6CB(skb)->iif; 462 } 463 464 } 465 if (is_udp4) { 466 if (inet->cmsg_flags) 467 ip_cmsg_recv(msg, skb); 468 } else { 469 if (np->rxopt.all) 470 ip6_datagram_recv_ctl(sk, msg, skb); 471 } 472 473 err = copied; 474 if (flags & MSG_TRUNC) 475 err = ulen; 476 477 out_free: 478 skb_free_datagram_locked(sk, skb); 479 out: 480 return err; 481 482 csum_copy_err: 483 slow = lock_sock_fast(sk); 484 if (!skb_kill_datagram(sk, skb, flags)) { 485 if (is_udp4) 486 UDP_INC_STATS_USER(sock_net(sk), 487 UDP_MIB_INERRORS, is_udplite); 488 else 489 UDP6_INC_STATS_USER(sock_net(sk), 490 UDP_MIB_INERRORS, is_udplite); 491 } 492 unlock_sock_fast(sk, slow); 493 494 if (noblock) 495 return -EAGAIN; 496 497 /* starting over for a new packet */ 498 msg->msg_flags &= ~MSG_TRUNC; 499 goto try_again; 500 } 501 502 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 503 u8 type, u8 code, int offset, __be32 info, 504 struct udp_table *udptable) 505 { 506 struct ipv6_pinfo *np; 507 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 508 const struct in6_addr *saddr = &hdr->saddr; 509 const struct in6_addr *daddr = &hdr->daddr; 510 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 511 struct sock *sk; 512 int err; 513 514 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 515 saddr, uh->source, inet6_iif(skb), udptable); 516 if (sk == NULL) 517 return; 518 519 if (type == ICMPV6_PKT_TOOBIG) 520 ip6_sk_update_pmtu(skb, sk, info); 521 if (type == NDISC_REDIRECT) 522 ip6_sk_redirect(skb, sk); 523 524 np = inet6_sk(sk); 525 526 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 527 goto out; 528 529 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 530 goto out; 531 532 if (np->recverr) 533 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 534 535 sk->sk_err = err; 536 sk->sk_error_report(sk); 537 out: 538 sock_put(sk); 539 } 540 541 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 542 { 543 int rc; 544 545 if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) 546 sock_rps_save_rxhash(sk, skb); 547 548 rc = sock_queue_rcv_skb(sk, skb); 549 if (rc < 0) { 550 int is_udplite = IS_UDPLITE(sk); 551 552 /* Note that an ENOMEM error is charged twice */ 553 if (rc == -ENOMEM) 554 UDP6_INC_STATS_BH(sock_net(sk), 555 UDP_MIB_RCVBUFERRORS, is_udplite); 556 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 557 kfree_skb(skb); 558 return -1; 559 } 560 return 0; 561 } 562 563 static __inline__ void udpv6_err(struct sk_buff *skb, 564 struct inet6_skb_parm *opt, u8 type, 565 u8 code, int offset, __be32 info ) 566 { 567 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 568 } 569 570 static struct static_key udpv6_encap_needed __read_mostly; 571 void udpv6_encap_enable(void) 572 { 573 if (!static_key_enabled(&udpv6_encap_needed)) 574 static_key_slow_inc(&udpv6_encap_needed); 575 } 576 EXPORT_SYMBOL(udpv6_encap_enable); 577 578 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 579 { 580 struct udp_sock *up = udp_sk(sk); 581 int rc; 582 int is_udplite = IS_UDPLITE(sk); 583 584 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 585 goto drop; 586 587 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 588 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 589 590 /* 591 * This is an encapsulation socket so pass the skb to 592 * the socket's udp_encap_rcv() hook. Otherwise, just 593 * fall through and pass this up the UDP socket. 594 * up->encap_rcv() returns the following value: 595 * =0 if skb was successfully passed to the encap 596 * handler or was discarded by it. 597 * >0 if skb should be passed on to UDP. 598 * <0 if skb should be resubmitted as proto -N 599 */ 600 601 /* if we're overly short, let UDP handle it */ 602 encap_rcv = ACCESS_ONCE(up->encap_rcv); 603 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 604 int ret; 605 606 ret = encap_rcv(sk, skb); 607 if (ret <= 0) { 608 UDP_INC_STATS_BH(sock_net(sk), 609 UDP_MIB_INDATAGRAMS, 610 is_udplite); 611 return -ret; 612 } 613 } 614 615 /* FALLTHROUGH -- it's a UDP Packet */ 616 } 617 618 /* 619 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 620 */ 621 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 622 623 if (up->pcrlen == 0) { /* full coverage was set */ 624 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 625 " %d while full coverage %d requested\n", 626 UDP_SKB_CB(skb)->cscov, skb->len); 627 goto drop; 628 } 629 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 630 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 631 "too small, need min %d\n", 632 UDP_SKB_CB(skb)->cscov, up->pcrlen); 633 goto drop; 634 } 635 } 636 637 if (rcu_access_pointer(sk->sk_filter)) { 638 if (udp_lib_checksum_complete(skb)) 639 goto drop; 640 } 641 642 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 643 goto drop; 644 645 skb_dst_drop(skb); 646 647 bh_lock_sock(sk); 648 rc = 0; 649 if (!sock_owned_by_user(sk)) 650 rc = __udpv6_queue_rcv_skb(sk, skb); 651 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 652 bh_unlock_sock(sk); 653 goto drop; 654 } 655 bh_unlock_sock(sk); 656 657 return rc; 658 drop: 659 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 660 atomic_inc(&sk->sk_drops); 661 kfree_skb(skb); 662 return -1; 663 } 664 665 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 666 __be16 loc_port, const struct in6_addr *loc_addr, 667 __be16 rmt_port, const struct in6_addr *rmt_addr, 668 int dif) 669 { 670 struct hlist_nulls_node *node; 671 struct sock *s = sk; 672 unsigned short num = ntohs(loc_port); 673 674 sk_nulls_for_each_from(s, node) { 675 struct inet_sock *inet = inet_sk(s); 676 677 if (!net_eq(sock_net(s), net)) 678 continue; 679 680 if (udp_sk(s)->udp_port_hash == num && 681 s->sk_family == PF_INET6) { 682 struct ipv6_pinfo *np = inet6_sk(s); 683 if (inet->inet_dport) { 684 if (inet->inet_dport != rmt_port) 685 continue; 686 } 687 if (!ipv6_addr_any(&np->daddr) && 688 !ipv6_addr_equal(&np->daddr, rmt_addr)) 689 continue; 690 691 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 692 continue; 693 694 if (!ipv6_addr_any(&np->rcv_saddr)) { 695 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 696 continue; 697 } 698 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 699 continue; 700 return s; 701 } 702 } 703 return NULL; 704 } 705 706 static void flush_stack(struct sock **stack, unsigned int count, 707 struct sk_buff *skb, unsigned int final) 708 { 709 struct sk_buff *skb1 = NULL; 710 struct sock *sk; 711 unsigned int i; 712 713 for (i = 0; i < count; i++) { 714 sk = stack[i]; 715 if (likely(skb1 == NULL)) 716 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 717 if (!skb1) { 718 atomic_inc(&sk->sk_drops); 719 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 720 IS_UDPLITE(sk)); 721 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 722 IS_UDPLITE(sk)); 723 } 724 725 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 726 skb1 = NULL; 727 } 728 if (unlikely(skb1)) 729 kfree_skb(skb1); 730 } 731 /* 732 * Note: called only from the BH handler context, 733 * so we don't need to lock the hashes. 734 */ 735 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 736 const struct in6_addr *saddr, const struct in6_addr *daddr, 737 struct udp_table *udptable) 738 { 739 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 740 const struct udphdr *uh = udp_hdr(skb); 741 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 742 int dif; 743 unsigned int i, count = 0; 744 745 spin_lock(&hslot->lock); 746 sk = sk_nulls_head(&hslot->head); 747 dif = inet6_iif(skb); 748 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 749 while (sk) { 750 stack[count++] = sk; 751 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 752 uh->source, saddr, dif); 753 if (unlikely(count == ARRAY_SIZE(stack))) { 754 if (!sk) 755 break; 756 flush_stack(stack, count, skb, ~0); 757 count = 0; 758 } 759 } 760 /* 761 * before releasing the lock, we must take reference on sockets 762 */ 763 for (i = 0; i < count; i++) 764 sock_hold(stack[i]); 765 766 spin_unlock(&hslot->lock); 767 768 if (count) { 769 flush_stack(stack, count, skb, count - 1); 770 771 for (i = 0; i < count; i++) 772 sock_put(stack[i]); 773 } else { 774 kfree_skb(skb); 775 } 776 return 0; 777 } 778 779 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 780 int proto) 781 { 782 struct net *net = dev_net(skb->dev); 783 struct sock *sk; 784 struct udphdr *uh; 785 const struct in6_addr *saddr, *daddr; 786 u32 ulen = 0; 787 788 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 789 goto discard; 790 791 saddr = &ipv6_hdr(skb)->saddr; 792 daddr = &ipv6_hdr(skb)->daddr; 793 uh = udp_hdr(skb); 794 795 ulen = ntohs(uh->len); 796 if (ulen > skb->len) 797 goto short_packet; 798 799 if (proto == IPPROTO_UDP) { 800 /* UDP validates ulen. */ 801 802 /* Check for jumbo payload */ 803 if (ulen == 0) 804 ulen = skb->len; 805 806 if (ulen < sizeof(*uh)) 807 goto short_packet; 808 809 if (ulen < skb->len) { 810 if (pskb_trim_rcsum(skb, ulen)) 811 goto short_packet; 812 saddr = &ipv6_hdr(skb)->saddr; 813 daddr = &ipv6_hdr(skb)->daddr; 814 uh = udp_hdr(skb); 815 } 816 } 817 818 if (udp6_csum_init(skb, uh, proto)) 819 goto discard; 820 821 /* 822 * Multicast receive code 823 */ 824 if (ipv6_addr_is_multicast(daddr)) 825 return __udp6_lib_mcast_deliver(net, skb, 826 saddr, daddr, udptable); 827 828 /* Unicast */ 829 830 /* 831 * check socket cache ... must talk to Alan about his plans 832 * for sock caches... i'll skip this for now. 833 */ 834 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 835 if (sk != NULL) { 836 int ret = udpv6_queue_rcv_skb(sk, skb); 837 sock_put(sk); 838 839 /* a return value > 0 means to resubmit the input, but 840 * it wants the return to be -protocol, or 0 841 */ 842 if (ret > 0) 843 return -ret; 844 845 return 0; 846 } 847 848 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 849 goto discard; 850 851 if (udp_lib_checksum_complete(skb)) 852 goto discard; 853 854 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 855 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 856 857 kfree_skb(skb); 858 return 0; 859 860 short_packet: 861 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 862 proto == IPPROTO_UDPLITE ? "-Lite" : "", 863 saddr, 864 ntohs(uh->source), 865 ulen, 866 skb->len, 867 daddr, 868 ntohs(uh->dest)); 869 870 discard: 871 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 872 kfree_skb(skb); 873 return 0; 874 } 875 876 static __inline__ int udpv6_rcv(struct sk_buff *skb) 877 { 878 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 879 } 880 881 /* 882 * Throw away all pending data and cancel the corking. Socket is locked. 883 */ 884 static void udp_v6_flush_pending_frames(struct sock *sk) 885 { 886 struct udp_sock *up = udp_sk(sk); 887 888 if (up->pending == AF_INET) 889 udp_flush_pending_frames(sk); 890 else if (up->pending) { 891 up->len = 0; 892 up->pending = 0; 893 ip6_flush_pending_frames(sk); 894 } 895 } 896 897 /** 898 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 899 * @sk: socket we are sending on 900 * @skb: sk_buff containing the filled-in UDP header 901 * (checksum field must be zeroed out) 902 */ 903 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 904 const struct in6_addr *saddr, 905 const struct in6_addr *daddr, int len) 906 { 907 unsigned int offset; 908 struct udphdr *uh = udp_hdr(skb); 909 __wsum csum = 0; 910 911 if (skb_queue_len(&sk->sk_write_queue) == 1) { 912 /* Only one fragment on the socket. */ 913 skb->csum_start = skb_transport_header(skb) - skb->head; 914 skb->csum_offset = offsetof(struct udphdr, check); 915 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 916 } else { 917 /* 918 * HW-checksum won't work as there are two or more 919 * fragments on the socket so that all csums of sk_buffs 920 * should be together 921 */ 922 offset = skb_transport_offset(skb); 923 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 924 925 skb->ip_summed = CHECKSUM_NONE; 926 927 skb_queue_walk(&sk->sk_write_queue, skb) { 928 csum = csum_add(csum, skb->csum); 929 } 930 931 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 932 csum); 933 if (uh->check == 0) 934 uh->check = CSUM_MANGLED_0; 935 } 936 } 937 938 /* 939 * Sending 940 */ 941 942 static int udp_v6_push_pending_frames(struct sock *sk) 943 { 944 struct sk_buff *skb; 945 struct udphdr *uh; 946 struct udp_sock *up = udp_sk(sk); 947 struct inet_sock *inet = inet_sk(sk); 948 struct flowi6 *fl6 = &inet->cork.fl.u.ip6; 949 int err = 0; 950 int is_udplite = IS_UDPLITE(sk); 951 __wsum csum = 0; 952 953 /* Grab the skbuff where UDP header space exists. */ 954 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 955 goto out; 956 957 /* 958 * Create a UDP header 959 */ 960 uh = udp_hdr(skb); 961 uh->source = fl6->fl6_sport; 962 uh->dest = fl6->fl6_dport; 963 uh->len = htons(up->len); 964 uh->check = 0; 965 966 if (is_udplite) 967 csum = udplite_csum_outgoing(sk, skb); 968 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 969 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 970 up->len); 971 goto send; 972 } else 973 csum = udp_csum_outgoing(sk, skb); 974 975 /* add protocol-dependent pseudo-header */ 976 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 977 up->len, fl6->flowi6_proto, csum); 978 if (uh->check == 0) 979 uh->check = CSUM_MANGLED_0; 980 981 send: 982 err = ip6_push_pending_frames(sk); 983 if (err) { 984 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 985 UDP6_INC_STATS_USER(sock_net(sk), 986 UDP_MIB_SNDBUFERRORS, is_udplite); 987 err = 0; 988 } 989 } else 990 UDP6_INC_STATS_USER(sock_net(sk), 991 UDP_MIB_OUTDATAGRAMS, is_udplite); 992 out: 993 up->len = 0; 994 up->pending = 0; 995 return err; 996 } 997 998 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 999 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 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 1006 struct in6_addr *daddr, *final_p, final; 1007 struct ipv6_txoptions *opt = NULL; 1008 struct ip6_flowlabel *flowlabel = NULL; 1009 struct flowi6 fl6; 1010 struct dst_entry *dst; 1011 int addr_len = msg->msg_namelen; 1012 int ulen = len; 1013 int hlimit = -1; 1014 int tclass = -1; 1015 int dontfrag = -1; 1016 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1017 int err; 1018 int connected = 0; 1019 int is_udplite = IS_UDPLITE(sk); 1020 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1021 1022 /* destination address check */ 1023 if (sin6) { 1024 if (addr_len < offsetof(struct sockaddr, sa_data)) 1025 return -EINVAL; 1026 1027 switch (sin6->sin6_family) { 1028 case AF_INET6: 1029 if (addr_len < SIN6_LEN_RFC2133) 1030 return -EINVAL; 1031 daddr = &sin6->sin6_addr; 1032 break; 1033 case AF_INET: 1034 goto do_udp_sendmsg; 1035 case AF_UNSPEC: 1036 msg->msg_name = sin6 = NULL; 1037 msg->msg_namelen = addr_len = 0; 1038 daddr = NULL; 1039 break; 1040 default: 1041 return -EINVAL; 1042 } 1043 } else if (!up->pending) { 1044 if (sk->sk_state != TCP_ESTABLISHED) 1045 return -EDESTADDRREQ; 1046 daddr = &np->daddr; 1047 } else 1048 daddr = NULL; 1049 1050 if (daddr) { 1051 if (ipv6_addr_v4mapped(daddr)) { 1052 struct sockaddr_in sin; 1053 sin.sin_family = AF_INET; 1054 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1055 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1056 msg->msg_name = &sin; 1057 msg->msg_namelen = sizeof(sin); 1058 do_udp_sendmsg: 1059 if (__ipv6_only_sock(sk)) 1060 return -ENETUNREACH; 1061 return udp_sendmsg(iocb, sk, msg, len); 1062 } 1063 } 1064 1065 if (up->pending == AF_INET) 1066 return udp_sendmsg(iocb, sk, msg, len); 1067 1068 /* Rough check on arithmetic overflow, 1069 better check is made in ip6_append_data(). 1070 */ 1071 if (len > INT_MAX - sizeof(struct udphdr)) 1072 return -EMSGSIZE; 1073 1074 if (up->pending) { 1075 /* 1076 * There are pending frames. 1077 * The socket lock must be held while it's corked. 1078 */ 1079 lock_sock(sk); 1080 if (likely(up->pending)) { 1081 if (unlikely(up->pending != AF_INET6)) { 1082 release_sock(sk); 1083 return -EAFNOSUPPORT; 1084 } 1085 dst = NULL; 1086 goto do_append_data; 1087 } 1088 release_sock(sk); 1089 } 1090 ulen += sizeof(struct udphdr); 1091 1092 memset(&fl6, 0, sizeof(fl6)); 1093 1094 if (sin6) { 1095 if (sin6->sin6_port == 0) 1096 return -EINVAL; 1097 1098 fl6.fl6_dport = sin6->sin6_port; 1099 daddr = &sin6->sin6_addr; 1100 1101 if (np->sndflow) { 1102 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1103 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1104 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1105 if (flowlabel == NULL) 1106 return -EINVAL; 1107 daddr = &flowlabel->dst; 1108 } 1109 } 1110 1111 /* 1112 * Otherwise it will be difficult to maintain 1113 * sk->sk_dst_cache. 1114 */ 1115 if (sk->sk_state == TCP_ESTABLISHED && 1116 ipv6_addr_equal(daddr, &np->daddr)) 1117 daddr = &np->daddr; 1118 1119 if (addr_len >= sizeof(struct sockaddr_in6) && 1120 sin6->sin6_scope_id && 1121 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 1122 fl6.flowi6_oif = sin6->sin6_scope_id; 1123 } else { 1124 if (sk->sk_state != TCP_ESTABLISHED) 1125 return -EDESTADDRREQ; 1126 1127 fl6.fl6_dport = inet->inet_dport; 1128 daddr = &np->daddr; 1129 fl6.flowlabel = np->flow_label; 1130 connected = 1; 1131 } 1132 1133 if (!fl6.flowi6_oif) 1134 fl6.flowi6_oif = sk->sk_bound_dev_if; 1135 1136 if (!fl6.flowi6_oif) 1137 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1138 1139 fl6.flowi6_mark = sk->sk_mark; 1140 1141 if (msg->msg_controllen) { 1142 opt = &opt_space; 1143 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1144 opt->tot_len = sizeof(*opt); 1145 1146 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1147 &hlimit, &tclass, &dontfrag); 1148 if (err < 0) { 1149 fl6_sock_release(flowlabel); 1150 return err; 1151 } 1152 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1153 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1154 if (flowlabel == NULL) 1155 return -EINVAL; 1156 } 1157 if (!(opt->opt_nflen|opt->opt_flen)) 1158 opt = NULL; 1159 connected = 0; 1160 } 1161 if (opt == NULL) 1162 opt = np->opt; 1163 if (flowlabel) 1164 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1165 opt = ipv6_fixup_options(&opt_space, opt); 1166 1167 fl6.flowi6_proto = sk->sk_protocol; 1168 if (!ipv6_addr_any(daddr)) 1169 fl6.daddr = *daddr; 1170 else 1171 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1172 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1173 fl6.saddr = np->saddr; 1174 fl6.fl6_sport = inet->inet_sport; 1175 1176 final_p = fl6_update_dst(&fl6, opt, &final); 1177 if (final_p) 1178 connected = 0; 1179 1180 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1181 fl6.flowi6_oif = np->mcast_oif; 1182 connected = 0; 1183 } else if (!fl6.flowi6_oif) 1184 fl6.flowi6_oif = np->ucast_oif; 1185 1186 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1187 1188 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); 1189 if (IS_ERR(dst)) { 1190 err = PTR_ERR(dst); 1191 dst = NULL; 1192 goto out; 1193 } 1194 1195 if (hlimit < 0) { 1196 if (ipv6_addr_is_multicast(&fl6.daddr)) 1197 hlimit = np->mcast_hops; 1198 else 1199 hlimit = np->hop_limit; 1200 if (hlimit < 0) 1201 hlimit = ip6_dst_hoplimit(dst); 1202 } 1203 1204 if (tclass < 0) 1205 tclass = np->tclass; 1206 1207 if (dontfrag < 0) 1208 dontfrag = np->dontfrag; 1209 1210 if (msg->msg_flags&MSG_CONFIRM) 1211 goto do_confirm; 1212 back_from_confirm: 1213 1214 lock_sock(sk); 1215 if (unlikely(up->pending)) { 1216 /* The socket is already corked while preparing it. */ 1217 /* ... which is an evident application bug. --ANK */ 1218 release_sock(sk); 1219 1220 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1221 err = -EINVAL; 1222 goto out; 1223 } 1224 1225 up->pending = AF_INET6; 1226 1227 do_append_data: 1228 up->len += ulen; 1229 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1230 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1231 sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1232 (struct rt6_info*)dst, 1233 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1234 if (err) 1235 udp_v6_flush_pending_frames(sk); 1236 else if (!corkreq) 1237 err = udp_v6_push_pending_frames(sk); 1238 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1239 up->pending = 0; 1240 1241 if (dst) { 1242 if (connected) { 1243 ip6_dst_store(sk, dst, 1244 ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 1245 &np->daddr : NULL, 1246 #ifdef CONFIG_IPV6_SUBTREES 1247 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1248 &np->saddr : 1249 #endif 1250 NULL); 1251 } else { 1252 dst_release(dst); 1253 } 1254 dst = NULL; 1255 } 1256 1257 if (err > 0) 1258 err = np->recverr ? net_xmit_errno(err) : 0; 1259 release_sock(sk); 1260 out: 1261 dst_release(dst); 1262 fl6_sock_release(flowlabel); 1263 if (!err) 1264 return len; 1265 /* 1266 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1267 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1268 * we don't have a good statistic (IpOutDiscards but it can be too many 1269 * things). We could add another new stat but at least for now that 1270 * seems like overkill. 1271 */ 1272 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1273 UDP6_INC_STATS_USER(sock_net(sk), 1274 UDP_MIB_SNDBUFERRORS, is_udplite); 1275 } 1276 return err; 1277 1278 do_confirm: 1279 dst_confirm(dst); 1280 if (!(msg->msg_flags&MSG_PROBE) || len) 1281 goto back_from_confirm; 1282 err = 0; 1283 goto out; 1284 } 1285 1286 void udpv6_destroy_sock(struct sock *sk) 1287 { 1288 lock_sock(sk); 1289 udp_v6_flush_pending_frames(sk); 1290 release_sock(sk); 1291 1292 inet6_destroy_sock(sk); 1293 } 1294 1295 /* 1296 * Socket option code for UDP 1297 */ 1298 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1299 char __user *optval, unsigned int optlen) 1300 { 1301 if (level == SOL_UDP || level == SOL_UDPLITE) 1302 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1303 udp_v6_push_pending_frames); 1304 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1305 } 1306 1307 #ifdef CONFIG_COMPAT 1308 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1309 char __user *optval, unsigned int optlen) 1310 { 1311 if (level == SOL_UDP || level == SOL_UDPLITE) 1312 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1313 udp_v6_push_pending_frames); 1314 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1315 } 1316 #endif 1317 1318 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1319 char __user *optval, int __user *optlen) 1320 { 1321 if (level == SOL_UDP || level == SOL_UDPLITE) 1322 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1323 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1324 } 1325 1326 #ifdef CONFIG_COMPAT 1327 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1328 char __user *optval, int __user *optlen) 1329 { 1330 if (level == SOL_UDP || level == SOL_UDPLITE) 1331 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1332 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1333 } 1334 #endif 1335 1336 static const struct inet6_protocol udpv6_protocol = { 1337 .handler = udpv6_rcv, 1338 .err_handler = udpv6_err, 1339 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1340 }; 1341 1342 /* ------------------------------------------------------------------------ */ 1343 #ifdef CONFIG_PROC_FS 1344 1345 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1346 { 1347 struct inet_sock *inet = inet_sk(sp); 1348 struct ipv6_pinfo *np = inet6_sk(sp); 1349 const struct in6_addr *dest, *src; 1350 __u16 destp, srcp; 1351 1352 dest = &np->daddr; 1353 src = &np->rcv_saddr; 1354 destp = ntohs(inet->inet_dport); 1355 srcp = ntohs(inet->inet_sport); 1356 seq_printf(seq, 1357 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1358 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1359 bucket, 1360 src->s6_addr32[0], src->s6_addr32[1], 1361 src->s6_addr32[2], src->s6_addr32[3], srcp, 1362 dest->s6_addr32[0], dest->s6_addr32[1], 1363 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1364 sp->sk_state, 1365 sk_wmem_alloc_get(sp), 1366 sk_rmem_alloc_get(sp), 1367 0, 0L, 0, 1368 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1369 0, 1370 sock_i_ino(sp), 1371 atomic_read(&sp->sk_refcnt), sp, 1372 atomic_read(&sp->sk_drops)); 1373 } 1374 1375 int udp6_seq_show(struct seq_file *seq, void *v) 1376 { 1377 if (v == SEQ_START_TOKEN) 1378 seq_printf(seq, 1379 " sl " 1380 "local_address " 1381 "remote_address " 1382 "st tx_queue rx_queue tr tm->when retrnsmt" 1383 " uid timeout inode ref pointer drops\n"); 1384 else 1385 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1386 return 0; 1387 } 1388 1389 static const struct file_operations udp6_afinfo_seq_fops = { 1390 .owner = THIS_MODULE, 1391 .open = udp_seq_open, 1392 .read = seq_read, 1393 .llseek = seq_lseek, 1394 .release = seq_release_net 1395 }; 1396 1397 static struct udp_seq_afinfo udp6_seq_afinfo = { 1398 .name = "udp6", 1399 .family = AF_INET6, 1400 .udp_table = &udp_table, 1401 .seq_fops = &udp6_afinfo_seq_fops, 1402 .seq_ops = { 1403 .show = udp6_seq_show, 1404 }, 1405 }; 1406 1407 int __net_init udp6_proc_init(struct net *net) 1408 { 1409 return udp_proc_register(net, &udp6_seq_afinfo); 1410 } 1411 1412 void udp6_proc_exit(struct net *net) { 1413 udp_proc_unregister(net, &udp6_seq_afinfo); 1414 } 1415 #endif /* CONFIG_PROC_FS */ 1416 1417 /* ------------------------------------------------------------------------ */ 1418 1419 struct proto udpv6_prot = { 1420 .name = "UDPv6", 1421 .owner = THIS_MODULE, 1422 .close = udp_lib_close, 1423 .connect = ip6_datagram_connect, 1424 .disconnect = udp_disconnect, 1425 .ioctl = udp_ioctl, 1426 .destroy = udpv6_destroy_sock, 1427 .setsockopt = udpv6_setsockopt, 1428 .getsockopt = udpv6_getsockopt, 1429 .sendmsg = udpv6_sendmsg, 1430 .recvmsg = udpv6_recvmsg, 1431 .backlog_rcv = __udpv6_queue_rcv_skb, 1432 .hash = udp_lib_hash, 1433 .unhash = udp_lib_unhash, 1434 .rehash = udp_v6_rehash, 1435 .get_port = udp_v6_get_port, 1436 .memory_allocated = &udp_memory_allocated, 1437 .sysctl_mem = sysctl_udp_mem, 1438 .sysctl_wmem = &sysctl_udp_wmem_min, 1439 .sysctl_rmem = &sysctl_udp_rmem_min, 1440 .obj_size = sizeof(struct udp6_sock), 1441 .slab_flags = SLAB_DESTROY_BY_RCU, 1442 .h.udp_table = &udp_table, 1443 #ifdef CONFIG_COMPAT 1444 .compat_setsockopt = compat_udpv6_setsockopt, 1445 .compat_getsockopt = compat_udpv6_getsockopt, 1446 #endif 1447 .clear_sk = sk_prot_clear_portaddr_nulls, 1448 }; 1449 1450 static struct inet_protosw udpv6_protosw = { 1451 .type = SOCK_DGRAM, 1452 .protocol = IPPROTO_UDP, 1453 .prot = &udpv6_prot, 1454 .ops = &inet6_dgram_ops, 1455 .no_check = UDP_CSUM_DEFAULT, 1456 .flags = INET_PROTOSW_PERMANENT, 1457 }; 1458 1459 1460 int __init udpv6_init(void) 1461 { 1462 int ret; 1463 1464 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1465 if (ret) 1466 goto out; 1467 1468 ret = inet6_register_protosw(&udpv6_protosw); 1469 if (ret) 1470 goto out_udpv6_protocol; 1471 out: 1472 return ret; 1473 1474 out_udpv6_protocol: 1475 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1476 goto out; 1477 } 1478 1479 void udpv6_exit(void) 1480 { 1481 inet6_unregister_protosw(&udpv6_protosw); 1482 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1483 } 1484