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 49 #include <linux/proc_fs.h> 50 #include <linux/seq_file.h> 51 #include <trace/events/skb.h> 52 #include "udp_impl.h" 53 54 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 55 { 56 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 57 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 58 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk); 59 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); 60 int sk_ipv6only = ipv6_only_sock(sk); 61 int sk2_ipv6only = inet_v6_ipv6only(sk2); 62 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 63 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 64 65 /* if both are mapped, treat as IPv4 */ 66 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 67 return (!sk2_ipv6only && 68 (!sk1_rcv_saddr || !sk2_rcv_saddr || 69 sk1_rcv_saddr == sk2_rcv_saddr)); 70 71 if (addr_type2 == IPV6_ADDR_ANY && 72 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 73 return 1; 74 75 if (addr_type == IPV6_ADDR_ANY && 76 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 77 return 1; 78 79 if (sk2_rcv_saddr6 && 80 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 81 return 1; 82 83 return 0; 84 } 85 86 static unsigned int udp6_portaddr_hash(struct net *net, 87 const struct in6_addr *addr6, 88 unsigned int port) 89 { 90 unsigned int hash, mix = net_hash_mix(net); 91 92 if (ipv6_addr_any(addr6)) 93 hash = jhash_1word(0, mix); 94 else if (ipv6_addr_v4mapped(addr6)) 95 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 96 else 97 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 98 99 return hash ^ port; 100 } 101 102 103 int udp_v6_get_port(struct sock *sk, unsigned short snum) 104 { 105 unsigned int hash2_nulladdr = 106 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 107 unsigned int hash2_partial = 108 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); 109 110 /* precompute partial secondary hash */ 111 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 112 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 113 } 114 115 static void udp_v6_rehash(struct sock *sk) 116 { 117 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 118 &inet6_sk(sk)->rcv_saddr, 119 inet_sk(sk)->inet_num); 120 121 udp_lib_rehash(sk, new_hash); 122 } 123 124 static inline int compute_score(struct sock *sk, struct net *net, 125 unsigned short hnum, 126 const struct in6_addr *saddr, __be16 sport, 127 const struct in6_addr *daddr, __be16 dport, 128 int dif) 129 { 130 int score = -1; 131 132 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 133 sk->sk_family == PF_INET6) { 134 struct ipv6_pinfo *np = inet6_sk(sk); 135 struct inet_sock *inet = inet_sk(sk); 136 137 score = 0; 138 if (inet->inet_dport) { 139 if (inet->inet_dport != sport) 140 return -1; 141 score++; 142 } 143 if (!ipv6_addr_any(&np->rcv_saddr)) { 144 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 145 return -1; 146 score++; 147 } 148 if (!ipv6_addr_any(&np->daddr)) { 149 if (!ipv6_addr_equal(&np->daddr, saddr)) 150 return -1; 151 score++; 152 } 153 if (sk->sk_bound_dev_if) { 154 if (sk->sk_bound_dev_if != dif) 155 return -1; 156 score++; 157 } 158 } 159 return score; 160 } 161 162 #define SCORE2_MAX (1 + 1 + 1) 163 static inline int compute_score2(struct sock *sk, struct net *net, 164 const struct in6_addr *saddr, __be16 sport, 165 const struct in6_addr *daddr, unsigned short hnum, 166 int dif) 167 { 168 int score = -1; 169 170 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 171 sk->sk_family == PF_INET6) { 172 struct ipv6_pinfo *np = inet6_sk(sk); 173 struct inet_sock *inet = inet_sk(sk); 174 175 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 176 return -1; 177 score = 0; 178 if (inet->inet_dport) { 179 if (inet->inet_dport != sport) 180 return -1; 181 score++; 182 } 183 if (!ipv6_addr_any(&np->daddr)) { 184 if (!ipv6_addr_equal(&np->daddr, saddr)) 185 return -1; 186 score++; 187 } 188 if (sk->sk_bound_dev_if) { 189 if (sk->sk_bound_dev_if != dif) 190 return -1; 191 score++; 192 } 193 } 194 return score; 195 } 196 197 198 /* called with read_rcu_lock() */ 199 static struct sock *udp6_lib_lookup2(struct net *net, 200 const struct in6_addr *saddr, __be16 sport, 201 const struct in6_addr *daddr, unsigned int hnum, int dif, 202 struct udp_hslot *hslot2, unsigned int slot2) 203 { 204 struct sock *sk, *result; 205 struct hlist_nulls_node *node; 206 int score, badness; 207 208 begin: 209 result = NULL; 210 badness = -1; 211 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 212 score = compute_score2(sk, net, saddr, sport, 213 daddr, hnum, dif); 214 if (score > badness) { 215 result = sk; 216 badness = score; 217 if (score == SCORE2_MAX) 218 goto exact_match; 219 } 220 } 221 /* 222 * if the nulls value we got at the end of this lookup is 223 * not the expected one, we must restart lookup. 224 * We probably met an item that was moved to another chain. 225 */ 226 if (get_nulls_value(node) != slot2) 227 goto begin; 228 229 if (result) { 230 exact_match: 231 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 232 result = NULL; 233 else if (unlikely(compute_score2(result, net, saddr, sport, 234 daddr, hnum, dif) < badness)) { 235 sock_put(result); 236 goto begin; 237 } 238 } 239 return result; 240 } 241 242 struct sock *__udp6_lib_lookup(struct net *net, 243 const struct in6_addr *saddr, __be16 sport, 244 const struct in6_addr *daddr, __be16 dport, 245 int dif, struct udp_table *udptable) 246 { 247 struct sock *sk, *result; 248 struct hlist_nulls_node *node; 249 unsigned short hnum = ntohs(dport); 250 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 251 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 252 int score, badness; 253 254 rcu_read_lock(); 255 if (hslot->count > 10) { 256 hash2 = udp6_portaddr_hash(net, daddr, hnum); 257 slot2 = hash2 & udptable->mask; 258 hslot2 = &udptable->hash2[slot2]; 259 if (hslot->count < hslot2->count) 260 goto begin; 261 262 result = udp6_lib_lookup2(net, saddr, sport, 263 daddr, hnum, dif, 264 hslot2, slot2); 265 if (!result) { 266 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 267 slot2 = hash2 & udptable->mask; 268 hslot2 = &udptable->hash2[slot2]; 269 if (hslot->count < hslot2->count) 270 goto begin; 271 272 result = udp6_lib_lookup2(net, saddr, sport, 273 &in6addr_any, hnum, dif, 274 hslot2, slot2); 275 } 276 rcu_read_unlock(); 277 return result; 278 } 279 begin: 280 result = NULL; 281 badness = -1; 282 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 283 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 284 if (score > badness) { 285 result = sk; 286 badness = score; 287 } 288 } 289 /* 290 * if the nulls value we got at the end of this lookup is 291 * not the expected one, we must restart lookup. 292 * We probably met an item that was moved to another chain. 293 */ 294 if (get_nulls_value(node) != slot) 295 goto begin; 296 297 if (result) { 298 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 299 result = NULL; 300 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 301 daddr, dport, dif) < badness)) { 302 sock_put(result); 303 goto begin; 304 } 305 } 306 rcu_read_unlock(); 307 return result; 308 } 309 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 310 311 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 312 __be16 sport, __be16 dport, 313 struct udp_table *udptable) 314 { 315 struct sock *sk; 316 const struct ipv6hdr *iph = ipv6_hdr(skb); 317 318 if (unlikely(sk = skb_steal_sock(skb))) 319 return sk; 320 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 321 &iph->daddr, dport, inet6_iif(skb), 322 udptable); 323 } 324 325 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 326 const struct in6_addr *daddr, __be16 dport, int dif) 327 { 328 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 329 } 330 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 331 332 333 /* 334 * This should be easy, if there is something there we 335 * return it, otherwise we block. 336 */ 337 338 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 339 struct msghdr *msg, size_t len, 340 int noblock, int flags, int *addr_len) 341 { 342 struct ipv6_pinfo *np = inet6_sk(sk); 343 struct inet_sock *inet = inet_sk(sk); 344 struct sk_buff *skb; 345 unsigned int ulen, copied; 346 int peeked, off = 0; 347 int err; 348 int is_udplite = IS_UDPLITE(sk); 349 int is_udp4; 350 bool slow; 351 352 if (addr_len) 353 *addr_len = sizeof(struct sockaddr_in6); 354 355 if (flags & MSG_ERRQUEUE) 356 return ipv6_recv_error(sk, msg, len); 357 358 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 359 return ipv6_recv_rxpmtu(sk, msg, len); 360 361 try_again: 362 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 363 &peeked, &off, &err); 364 if (!skb) 365 goto out; 366 367 ulen = skb->len - sizeof(struct udphdr); 368 copied = len; 369 if (copied > ulen) 370 copied = ulen; 371 else if (copied < ulen) 372 msg->msg_flags |= MSG_TRUNC; 373 374 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 375 376 /* 377 * If checksum is needed at all, try to do it while copying the 378 * data. If the data is truncated, or if we only want a partial 379 * coverage checksum (UDP-Lite), do it before the copy. 380 */ 381 382 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 383 if (udp_lib_checksum_complete(skb)) 384 goto csum_copy_err; 385 } 386 387 if (skb_csum_unnecessary(skb)) 388 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 389 msg->msg_iov, copied); 390 else { 391 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 392 if (err == -EINVAL) 393 goto csum_copy_err; 394 } 395 if (unlikely(err)) { 396 trace_kfree_skb(skb, udpv6_recvmsg); 397 if (!peeked) { 398 atomic_inc(&sk->sk_drops); 399 if (is_udp4) 400 UDP_INC_STATS_USER(sock_net(sk), 401 UDP_MIB_INERRORS, 402 is_udplite); 403 else 404 UDP6_INC_STATS_USER(sock_net(sk), 405 UDP_MIB_INERRORS, 406 is_udplite); 407 } 408 goto out_free; 409 } 410 if (!peeked) { 411 if (is_udp4) 412 UDP_INC_STATS_USER(sock_net(sk), 413 UDP_MIB_INDATAGRAMS, is_udplite); 414 else 415 UDP6_INC_STATS_USER(sock_net(sk), 416 UDP_MIB_INDATAGRAMS, is_udplite); 417 } 418 419 sock_recv_ts_and_drops(msg, sk, skb); 420 421 /* Copy the address. */ 422 if (msg->msg_name) { 423 struct sockaddr_in6 *sin6; 424 425 sin6 = (struct sockaddr_in6 *) msg->msg_name; 426 sin6->sin6_family = AF_INET6; 427 sin6->sin6_port = udp_hdr(skb)->source; 428 sin6->sin6_flowinfo = 0; 429 sin6->sin6_scope_id = 0; 430 431 if (is_udp4) 432 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 433 &sin6->sin6_addr); 434 else { 435 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 436 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 437 sin6->sin6_scope_id = IP6CB(skb)->iif; 438 } 439 440 } 441 if (is_udp4) { 442 if (inet->cmsg_flags) 443 ip_cmsg_recv(msg, skb); 444 } else { 445 if (np->rxopt.all) 446 datagram_recv_ctl(sk, msg, skb); 447 } 448 449 err = copied; 450 if (flags & MSG_TRUNC) 451 err = ulen; 452 453 out_free: 454 skb_free_datagram_locked(sk, skb); 455 out: 456 return err; 457 458 csum_copy_err: 459 slow = lock_sock_fast(sk); 460 if (!skb_kill_datagram(sk, skb, flags)) { 461 if (is_udp4) 462 UDP_INC_STATS_USER(sock_net(sk), 463 UDP_MIB_INERRORS, is_udplite); 464 else 465 UDP6_INC_STATS_USER(sock_net(sk), 466 UDP_MIB_INERRORS, is_udplite); 467 } 468 unlock_sock_fast(sk, slow); 469 470 if (noblock) 471 return -EAGAIN; 472 473 /* starting over for a new packet */ 474 msg->msg_flags &= ~MSG_TRUNC; 475 goto try_again; 476 } 477 478 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 479 u8 type, u8 code, int offset, __be32 info, 480 struct udp_table *udptable) 481 { 482 struct ipv6_pinfo *np; 483 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 484 const struct in6_addr *saddr = &hdr->saddr; 485 const struct in6_addr *daddr = &hdr->daddr; 486 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 487 struct sock *sk; 488 int err; 489 490 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 491 saddr, uh->source, inet6_iif(skb), udptable); 492 if (sk == NULL) 493 return; 494 495 if (type == ICMPV6_PKT_TOOBIG) 496 ip6_sk_update_pmtu(skb, sk, info); 497 if (type == NDISC_REDIRECT) 498 ip6_sk_redirect(skb, sk); 499 500 np = inet6_sk(sk); 501 502 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 503 goto out; 504 505 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 506 goto out; 507 508 if (np->recverr) 509 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 510 511 sk->sk_err = err; 512 sk->sk_error_report(sk); 513 out: 514 sock_put(sk); 515 } 516 517 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 518 { 519 int rc; 520 521 if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) 522 sock_rps_save_rxhash(sk, skb); 523 524 rc = sock_queue_rcv_skb(sk, skb); 525 if (rc < 0) { 526 int is_udplite = IS_UDPLITE(sk); 527 528 /* Note that an ENOMEM error is charged twice */ 529 if (rc == -ENOMEM) 530 UDP6_INC_STATS_BH(sock_net(sk), 531 UDP_MIB_RCVBUFERRORS, is_udplite); 532 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 533 kfree_skb(skb); 534 return -1; 535 } 536 return 0; 537 } 538 539 static __inline__ void udpv6_err(struct sk_buff *skb, 540 struct inet6_skb_parm *opt, u8 type, 541 u8 code, int offset, __be32 info ) 542 { 543 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 544 } 545 546 static struct static_key udpv6_encap_needed __read_mostly; 547 void udpv6_encap_enable(void) 548 { 549 if (!static_key_enabled(&udpv6_encap_needed)) 550 static_key_slow_inc(&udpv6_encap_needed); 551 } 552 EXPORT_SYMBOL(udpv6_encap_enable); 553 554 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 555 { 556 struct udp_sock *up = udp_sk(sk); 557 int rc; 558 int is_udplite = IS_UDPLITE(sk); 559 560 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 561 goto drop; 562 563 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 564 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 565 566 /* 567 * This is an encapsulation socket so pass the skb to 568 * the socket's udp_encap_rcv() hook. Otherwise, just 569 * fall through and pass this up the UDP socket. 570 * up->encap_rcv() returns the following value: 571 * =0 if skb was successfully passed to the encap 572 * handler or was discarded by it. 573 * >0 if skb should be passed on to UDP. 574 * <0 if skb should be resubmitted as proto -N 575 */ 576 577 /* if we're overly short, let UDP handle it */ 578 encap_rcv = ACCESS_ONCE(up->encap_rcv); 579 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 580 int ret; 581 582 ret = encap_rcv(sk, skb); 583 if (ret <= 0) { 584 UDP_INC_STATS_BH(sock_net(sk), 585 UDP_MIB_INDATAGRAMS, 586 is_udplite); 587 return -ret; 588 } 589 } 590 591 /* FALLTHROUGH -- it's a UDP Packet */ 592 } 593 594 /* 595 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 596 */ 597 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 598 599 if (up->pcrlen == 0) { /* full coverage was set */ 600 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 601 " %d while full coverage %d requested\n", 602 UDP_SKB_CB(skb)->cscov, skb->len); 603 goto drop; 604 } 605 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 606 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 607 "too small, need min %d\n", 608 UDP_SKB_CB(skb)->cscov, up->pcrlen); 609 goto drop; 610 } 611 } 612 613 if (rcu_access_pointer(sk->sk_filter)) { 614 if (udp_lib_checksum_complete(skb)) 615 goto drop; 616 } 617 618 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 619 goto drop; 620 621 skb_dst_drop(skb); 622 623 bh_lock_sock(sk); 624 rc = 0; 625 if (!sock_owned_by_user(sk)) 626 rc = __udpv6_queue_rcv_skb(sk, skb); 627 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 628 bh_unlock_sock(sk); 629 goto drop; 630 } 631 bh_unlock_sock(sk); 632 633 return rc; 634 drop: 635 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 636 atomic_inc(&sk->sk_drops); 637 kfree_skb(skb); 638 return -1; 639 } 640 641 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 642 __be16 loc_port, const struct in6_addr *loc_addr, 643 __be16 rmt_port, const struct in6_addr *rmt_addr, 644 int dif) 645 { 646 struct hlist_nulls_node *node; 647 struct sock *s = sk; 648 unsigned short num = ntohs(loc_port); 649 650 sk_nulls_for_each_from(s, node) { 651 struct inet_sock *inet = inet_sk(s); 652 653 if (!net_eq(sock_net(s), net)) 654 continue; 655 656 if (udp_sk(s)->udp_port_hash == num && 657 s->sk_family == PF_INET6) { 658 struct ipv6_pinfo *np = inet6_sk(s); 659 if (inet->inet_dport) { 660 if (inet->inet_dport != rmt_port) 661 continue; 662 } 663 if (!ipv6_addr_any(&np->daddr) && 664 !ipv6_addr_equal(&np->daddr, rmt_addr)) 665 continue; 666 667 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 668 continue; 669 670 if (!ipv6_addr_any(&np->rcv_saddr)) { 671 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 672 continue; 673 } 674 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 675 continue; 676 return s; 677 } 678 } 679 return NULL; 680 } 681 682 static void flush_stack(struct sock **stack, unsigned int count, 683 struct sk_buff *skb, unsigned int final) 684 { 685 struct sk_buff *skb1 = NULL; 686 struct sock *sk; 687 unsigned int i; 688 689 for (i = 0; i < count; i++) { 690 sk = stack[i]; 691 if (likely(skb1 == NULL)) 692 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 693 if (!skb1) { 694 atomic_inc(&sk->sk_drops); 695 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 696 IS_UDPLITE(sk)); 697 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 698 IS_UDPLITE(sk)); 699 } 700 701 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 702 skb1 = NULL; 703 } 704 if (unlikely(skb1)) 705 kfree_skb(skb1); 706 } 707 /* 708 * Note: called only from the BH handler context, 709 * so we don't need to lock the hashes. 710 */ 711 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 712 const struct in6_addr *saddr, const struct in6_addr *daddr, 713 struct udp_table *udptable) 714 { 715 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 716 const struct udphdr *uh = udp_hdr(skb); 717 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 718 int dif; 719 unsigned int i, count = 0; 720 721 spin_lock(&hslot->lock); 722 sk = sk_nulls_head(&hslot->head); 723 dif = inet6_iif(skb); 724 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 725 while (sk) { 726 stack[count++] = sk; 727 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 728 uh->source, saddr, dif); 729 if (unlikely(count == ARRAY_SIZE(stack))) { 730 if (!sk) 731 break; 732 flush_stack(stack, count, skb, ~0); 733 count = 0; 734 } 735 } 736 /* 737 * before releasing the lock, we must take reference on sockets 738 */ 739 for (i = 0; i < count; i++) 740 sock_hold(stack[i]); 741 742 spin_unlock(&hslot->lock); 743 744 if (count) { 745 flush_stack(stack, count, skb, count - 1); 746 747 for (i = 0; i < count; i++) 748 sock_put(stack[i]); 749 } else { 750 kfree_skb(skb); 751 } 752 return 0; 753 } 754 755 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 756 int proto) 757 { 758 int err; 759 760 UDP_SKB_CB(skb)->partial_cov = 0; 761 UDP_SKB_CB(skb)->cscov = skb->len; 762 763 if (proto == IPPROTO_UDPLITE) { 764 err = udplite_checksum_init(skb, uh); 765 if (err) 766 return err; 767 } 768 769 if (uh->check == 0) { 770 /* RFC 2460 section 8.1 says that we SHOULD log 771 this error. Well, it is reasonable. 772 */ 773 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 774 return 1; 775 } 776 if (skb->ip_summed == CHECKSUM_COMPLETE && 777 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 778 skb->len, proto, skb->csum)) 779 skb->ip_summed = CHECKSUM_UNNECESSARY; 780 781 if (!skb_csum_unnecessary(skb)) 782 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 783 &ipv6_hdr(skb)->daddr, 784 skb->len, proto, 0)); 785 786 return 0; 787 } 788 789 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 790 int proto) 791 { 792 struct net *net = dev_net(skb->dev); 793 struct sock *sk; 794 struct udphdr *uh; 795 const struct in6_addr *saddr, *daddr; 796 u32 ulen = 0; 797 798 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 799 goto discard; 800 801 saddr = &ipv6_hdr(skb)->saddr; 802 daddr = &ipv6_hdr(skb)->daddr; 803 uh = udp_hdr(skb); 804 805 ulen = ntohs(uh->len); 806 if (ulen > skb->len) 807 goto short_packet; 808 809 if (proto == IPPROTO_UDP) { 810 /* UDP validates ulen. */ 811 812 /* Check for jumbo payload */ 813 if (ulen == 0) 814 ulen = skb->len; 815 816 if (ulen < sizeof(*uh)) 817 goto short_packet; 818 819 if (ulen < skb->len) { 820 if (pskb_trim_rcsum(skb, ulen)) 821 goto short_packet; 822 saddr = &ipv6_hdr(skb)->saddr; 823 daddr = &ipv6_hdr(skb)->daddr; 824 uh = udp_hdr(skb); 825 } 826 } 827 828 if (udp6_csum_init(skb, uh, proto)) 829 goto discard; 830 831 /* 832 * Multicast receive code 833 */ 834 if (ipv6_addr_is_multicast(daddr)) 835 return __udp6_lib_mcast_deliver(net, skb, 836 saddr, daddr, udptable); 837 838 /* Unicast */ 839 840 /* 841 * check socket cache ... must talk to Alan about his plans 842 * for sock caches... i'll skip this for now. 843 */ 844 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 845 if (sk != NULL) { 846 int ret = udpv6_queue_rcv_skb(sk, skb); 847 sock_put(sk); 848 849 /* a return value > 0 means to resubmit the input, but 850 * it wants the return to be -protocol, or 0 851 */ 852 if (ret > 0) 853 return -ret; 854 855 return 0; 856 } 857 858 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 859 goto discard; 860 861 if (udp_lib_checksum_complete(skb)) 862 goto discard; 863 864 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 865 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 866 867 kfree_skb(skb); 868 return 0; 869 870 short_packet: 871 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 872 proto == IPPROTO_UDPLITE ? "-Lite" : "", 873 saddr, 874 ntohs(uh->source), 875 ulen, 876 skb->len, 877 daddr, 878 ntohs(uh->dest)); 879 880 discard: 881 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 882 kfree_skb(skb); 883 return 0; 884 } 885 886 static __inline__ int udpv6_rcv(struct sk_buff *skb) 887 { 888 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 889 } 890 891 /* 892 * Throw away all pending data and cancel the corking. Socket is locked. 893 */ 894 static void udp_v6_flush_pending_frames(struct sock *sk) 895 { 896 struct udp_sock *up = udp_sk(sk); 897 898 if (up->pending == AF_INET) 899 udp_flush_pending_frames(sk); 900 else if (up->pending) { 901 up->len = 0; 902 up->pending = 0; 903 ip6_flush_pending_frames(sk); 904 } 905 } 906 907 /** 908 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 909 * @sk: socket we are sending on 910 * @skb: sk_buff containing the filled-in UDP header 911 * (checksum field must be zeroed out) 912 */ 913 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 914 const struct in6_addr *saddr, 915 const struct in6_addr *daddr, int len) 916 { 917 unsigned int offset; 918 struct udphdr *uh = udp_hdr(skb); 919 __wsum csum = 0; 920 921 if (skb_queue_len(&sk->sk_write_queue) == 1) { 922 /* Only one fragment on the socket. */ 923 skb->csum_start = skb_transport_header(skb) - skb->head; 924 skb->csum_offset = offsetof(struct udphdr, check); 925 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 926 } else { 927 /* 928 * HW-checksum won't work as there are two or more 929 * fragments on the socket so that all csums of sk_buffs 930 * should be together 931 */ 932 offset = skb_transport_offset(skb); 933 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 934 935 skb->ip_summed = CHECKSUM_NONE; 936 937 skb_queue_walk(&sk->sk_write_queue, skb) { 938 csum = csum_add(csum, skb->csum); 939 } 940 941 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 942 csum); 943 if (uh->check == 0) 944 uh->check = CSUM_MANGLED_0; 945 } 946 } 947 948 /* 949 * Sending 950 */ 951 952 static int udp_v6_push_pending_frames(struct sock *sk) 953 { 954 struct sk_buff *skb; 955 struct udphdr *uh; 956 struct udp_sock *up = udp_sk(sk); 957 struct inet_sock *inet = inet_sk(sk); 958 struct flowi6 *fl6 = &inet->cork.fl.u.ip6; 959 int err = 0; 960 int is_udplite = IS_UDPLITE(sk); 961 __wsum csum = 0; 962 963 /* Grab the skbuff where UDP header space exists. */ 964 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 965 goto out; 966 967 /* 968 * Create a UDP header 969 */ 970 uh = udp_hdr(skb); 971 uh->source = fl6->fl6_sport; 972 uh->dest = fl6->fl6_dport; 973 uh->len = htons(up->len); 974 uh->check = 0; 975 976 if (is_udplite) 977 csum = udplite_csum_outgoing(sk, skb); 978 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 979 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 980 up->len); 981 goto send; 982 } else 983 csum = udp_csum_outgoing(sk, skb); 984 985 /* add protocol-dependent pseudo-header */ 986 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 987 up->len, fl6->flowi6_proto, csum); 988 if (uh->check == 0) 989 uh->check = CSUM_MANGLED_0; 990 991 send: 992 err = ip6_push_pending_frames(sk); 993 if (err) { 994 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 995 UDP6_INC_STATS_USER(sock_net(sk), 996 UDP_MIB_SNDBUFERRORS, is_udplite); 997 err = 0; 998 } 999 } else 1000 UDP6_INC_STATS_USER(sock_net(sk), 1001 UDP_MIB_OUTDATAGRAMS, is_udplite); 1002 out: 1003 up->len = 0; 1004 up->pending = 0; 1005 return err; 1006 } 1007 1008 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 1009 struct msghdr *msg, size_t len) 1010 { 1011 struct ipv6_txoptions opt_space; 1012 struct udp_sock *up = udp_sk(sk); 1013 struct inet_sock *inet = inet_sk(sk); 1014 struct ipv6_pinfo *np = inet6_sk(sk); 1015 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 1016 struct in6_addr *daddr, *final_p, final; 1017 struct ipv6_txoptions *opt = NULL; 1018 struct ip6_flowlabel *flowlabel = NULL; 1019 struct flowi6 fl6; 1020 struct dst_entry *dst; 1021 int addr_len = msg->msg_namelen; 1022 int ulen = len; 1023 int hlimit = -1; 1024 int tclass = -1; 1025 int dontfrag = -1; 1026 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1027 int err; 1028 int connected = 0; 1029 int is_udplite = IS_UDPLITE(sk); 1030 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1031 1032 /* destination address check */ 1033 if (sin6) { 1034 if (addr_len < offsetof(struct sockaddr, sa_data)) 1035 return -EINVAL; 1036 1037 switch (sin6->sin6_family) { 1038 case AF_INET6: 1039 if (addr_len < SIN6_LEN_RFC2133) 1040 return -EINVAL; 1041 daddr = &sin6->sin6_addr; 1042 break; 1043 case AF_INET: 1044 goto do_udp_sendmsg; 1045 case AF_UNSPEC: 1046 msg->msg_name = sin6 = NULL; 1047 msg->msg_namelen = addr_len = 0; 1048 daddr = NULL; 1049 break; 1050 default: 1051 return -EINVAL; 1052 } 1053 } else if (!up->pending) { 1054 if (sk->sk_state != TCP_ESTABLISHED) 1055 return -EDESTADDRREQ; 1056 daddr = &np->daddr; 1057 } else 1058 daddr = NULL; 1059 1060 if (daddr) { 1061 if (ipv6_addr_v4mapped(daddr)) { 1062 struct sockaddr_in sin; 1063 sin.sin_family = AF_INET; 1064 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1065 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1066 msg->msg_name = &sin; 1067 msg->msg_namelen = sizeof(sin); 1068 do_udp_sendmsg: 1069 if (__ipv6_only_sock(sk)) 1070 return -ENETUNREACH; 1071 return udp_sendmsg(iocb, sk, msg, len); 1072 } 1073 } 1074 1075 if (up->pending == AF_INET) 1076 return udp_sendmsg(iocb, sk, msg, len); 1077 1078 /* Rough check on arithmetic overflow, 1079 better check is made in ip6_append_data(). 1080 */ 1081 if (len > INT_MAX - sizeof(struct udphdr)) 1082 return -EMSGSIZE; 1083 1084 if (up->pending) { 1085 /* 1086 * There are pending frames. 1087 * The socket lock must be held while it's corked. 1088 */ 1089 lock_sock(sk); 1090 if (likely(up->pending)) { 1091 if (unlikely(up->pending != AF_INET6)) { 1092 release_sock(sk); 1093 return -EAFNOSUPPORT; 1094 } 1095 dst = NULL; 1096 goto do_append_data; 1097 } 1098 release_sock(sk); 1099 } 1100 ulen += sizeof(struct udphdr); 1101 1102 memset(&fl6, 0, sizeof(fl6)); 1103 1104 if (sin6) { 1105 if (sin6->sin6_port == 0) 1106 return -EINVAL; 1107 1108 fl6.fl6_dport = sin6->sin6_port; 1109 daddr = &sin6->sin6_addr; 1110 1111 if (np->sndflow) { 1112 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1113 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1114 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1115 if (flowlabel == NULL) 1116 return -EINVAL; 1117 daddr = &flowlabel->dst; 1118 } 1119 } 1120 1121 /* 1122 * Otherwise it will be difficult to maintain 1123 * sk->sk_dst_cache. 1124 */ 1125 if (sk->sk_state == TCP_ESTABLISHED && 1126 ipv6_addr_equal(daddr, &np->daddr)) 1127 daddr = &np->daddr; 1128 1129 if (addr_len >= sizeof(struct sockaddr_in6) && 1130 sin6->sin6_scope_id && 1131 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 1132 fl6.flowi6_oif = sin6->sin6_scope_id; 1133 } else { 1134 if (sk->sk_state != TCP_ESTABLISHED) 1135 return -EDESTADDRREQ; 1136 1137 fl6.fl6_dport = inet->inet_dport; 1138 daddr = &np->daddr; 1139 fl6.flowlabel = np->flow_label; 1140 connected = 1; 1141 } 1142 1143 if (!fl6.flowi6_oif) 1144 fl6.flowi6_oif = sk->sk_bound_dev_if; 1145 1146 if (!fl6.flowi6_oif) 1147 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1148 1149 fl6.flowi6_mark = sk->sk_mark; 1150 1151 if (msg->msg_controllen) { 1152 opt = &opt_space; 1153 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1154 opt->tot_len = sizeof(*opt); 1155 1156 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1157 &hlimit, &tclass, &dontfrag); 1158 if (err < 0) { 1159 fl6_sock_release(flowlabel); 1160 return err; 1161 } 1162 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1163 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1164 if (flowlabel == NULL) 1165 return -EINVAL; 1166 } 1167 if (!(opt->opt_nflen|opt->opt_flen)) 1168 opt = NULL; 1169 connected = 0; 1170 } 1171 if (opt == NULL) 1172 opt = np->opt; 1173 if (flowlabel) 1174 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1175 opt = ipv6_fixup_options(&opt_space, opt); 1176 1177 fl6.flowi6_proto = sk->sk_protocol; 1178 if (!ipv6_addr_any(daddr)) 1179 fl6.daddr = *daddr; 1180 else 1181 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1182 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1183 fl6.saddr = np->saddr; 1184 fl6.fl6_sport = inet->inet_sport; 1185 1186 final_p = fl6_update_dst(&fl6, opt, &final); 1187 if (final_p) 1188 connected = 0; 1189 1190 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1191 fl6.flowi6_oif = np->mcast_oif; 1192 connected = 0; 1193 } else if (!fl6.flowi6_oif) 1194 fl6.flowi6_oif = np->ucast_oif; 1195 1196 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1197 1198 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); 1199 if (IS_ERR(dst)) { 1200 err = PTR_ERR(dst); 1201 dst = NULL; 1202 goto out; 1203 } 1204 1205 if (hlimit < 0) { 1206 if (ipv6_addr_is_multicast(&fl6.daddr)) 1207 hlimit = np->mcast_hops; 1208 else 1209 hlimit = np->hop_limit; 1210 if (hlimit < 0) 1211 hlimit = ip6_dst_hoplimit(dst); 1212 } 1213 1214 if (tclass < 0) 1215 tclass = np->tclass; 1216 1217 if (dontfrag < 0) 1218 dontfrag = np->dontfrag; 1219 1220 if (msg->msg_flags&MSG_CONFIRM) 1221 goto do_confirm; 1222 back_from_confirm: 1223 1224 lock_sock(sk); 1225 if (unlikely(up->pending)) { 1226 /* The socket is already corked while preparing it. */ 1227 /* ... which is an evident application bug. --ANK */ 1228 release_sock(sk); 1229 1230 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1231 err = -EINVAL; 1232 goto out; 1233 } 1234 1235 up->pending = AF_INET6; 1236 1237 do_append_data: 1238 up->len += ulen; 1239 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1240 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1241 sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1242 (struct rt6_info*)dst, 1243 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1244 if (err) 1245 udp_v6_flush_pending_frames(sk); 1246 else if (!corkreq) 1247 err = udp_v6_push_pending_frames(sk); 1248 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1249 up->pending = 0; 1250 1251 if (dst) { 1252 if (connected) { 1253 ip6_dst_store(sk, dst, 1254 ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 1255 &np->daddr : NULL, 1256 #ifdef CONFIG_IPV6_SUBTREES 1257 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1258 &np->saddr : 1259 #endif 1260 NULL); 1261 } else { 1262 dst_release(dst); 1263 } 1264 dst = NULL; 1265 } 1266 1267 if (err > 0) 1268 err = np->recverr ? net_xmit_errno(err) : 0; 1269 release_sock(sk); 1270 out: 1271 dst_release(dst); 1272 fl6_sock_release(flowlabel); 1273 if (!err) 1274 return len; 1275 /* 1276 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1277 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1278 * we don't have a good statistic (IpOutDiscards but it can be too many 1279 * things). We could add another new stat but at least for now that 1280 * seems like overkill. 1281 */ 1282 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1283 UDP6_INC_STATS_USER(sock_net(sk), 1284 UDP_MIB_SNDBUFERRORS, is_udplite); 1285 } 1286 return err; 1287 1288 do_confirm: 1289 dst_confirm(dst); 1290 if (!(msg->msg_flags&MSG_PROBE) || len) 1291 goto back_from_confirm; 1292 err = 0; 1293 goto out; 1294 } 1295 1296 void udpv6_destroy_sock(struct sock *sk) 1297 { 1298 lock_sock(sk); 1299 udp_v6_flush_pending_frames(sk); 1300 release_sock(sk); 1301 1302 inet6_destroy_sock(sk); 1303 } 1304 1305 /* 1306 * Socket option code for UDP 1307 */ 1308 int 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 ipv6_setsockopt(sk, level, optname, optval, optlen); 1315 } 1316 1317 #ifdef CONFIG_COMPAT 1318 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1319 char __user *optval, unsigned int optlen) 1320 { 1321 if (level == SOL_UDP || level == SOL_UDPLITE) 1322 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1323 udp_v6_push_pending_frames); 1324 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1325 } 1326 #endif 1327 1328 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1329 char __user *optval, int __user *optlen) 1330 { 1331 if (level == SOL_UDP || level == SOL_UDPLITE) 1332 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1333 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1334 } 1335 1336 #ifdef CONFIG_COMPAT 1337 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1338 char __user *optval, int __user *optlen) 1339 { 1340 if (level == SOL_UDP || level == SOL_UDPLITE) 1341 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1342 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1343 } 1344 #endif 1345 1346 static const struct inet6_protocol udpv6_protocol = { 1347 .handler = udpv6_rcv, 1348 .err_handler = udpv6_err, 1349 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1350 }; 1351 1352 /* ------------------------------------------------------------------------ */ 1353 #ifdef CONFIG_PROC_FS 1354 1355 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1356 { 1357 struct inet_sock *inet = inet_sk(sp); 1358 struct ipv6_pinfo *np = inet6_sk(sp); 1359 const struct in6_addr *dest, *src; 1360 __u16 destp, srcp; 1361 1362 dest = &np->daddr; 1363 src = &np->rcv_saddr; 1364 destp = ntohs(inet->inet_dport); 1365 srcp = ntohs(inet->inet_sport); 1366 seq_printf(seq, 1367 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1368 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1369 bucket, 1370 src->s6_addr32[0], src->s6_addr32[1], 1371 src->s6_addr32[2], src->s6_addr32[3], srcp, 1372 dest->s6_addr32[0], dest->s6_addr32[1], 1373 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1374 sp->sk_state, 1375 sk_wmem_alloc_get(sp), 1376 sk_rmem_alloc_get(sp), 1377 0, 0L, 0, 1378 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1379 0, 1380 sock_i_ino(sp), 1381 atomic_read(&sp->sk_refcnt), sp, 1382 atomic_read(&sp->sk_drops)); 1383 } 1384 1385 int udp6_seq_show(struct seq_file *seq, void *v) 1386 { 1387 if (v == SEQ_START_TOKEN) 1388 seq_printf(seq, 1389 " sl " 1390 "local_address " 1391 "remote_address " 1392 "st tx_queue rx_queue tr tm->when retrnsmt" 1393 " uid timeout inode ref pointer drops\n"); 1394 else 1395 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1396 return 0; 1397 } 1398 1399 static const struct file_operations udp6_afinfo_seq_fops = { 1400 .owner = THIS_MODULE, 1401 .open = udp_seq_open, 1402 .read = seq_read, 1403 .llseek = seq_lseek, 1404 .release = seq_release_net 1405 }; 1406 1407 static struct udp_seq_afinfo udp6_seq_afinfo = { 1408 .name = "udp6", 1409 .family = AF_INET6, 1410 .udp_table = &udp_table, 1411 .seq_fops = &udp6_afinfo_seq_fops, 1412 .seq_ops = { 1413 .show = udp6_seq_show, 1414 }, 1415 }; 1416 1417 int __net_init udp6_proc_init(struct net *net) 1418 { 1419 return udp_proc_register(net, &udp6_seq_afinfo); 1420 } 1421 1422 void udp6_proc_exit(struct net *net) { 1423 udp_proc_unregister(net, &udp6_seq_afinfo); 1424 } 1425 #endif /* CONFIG_PROC_FS */ 1426 1427 /* ------------------------------------------------------------------------ */ 1428 1429 struct proto udpv6_prot = { 1430 .name = "UDPv6", 1431 .owner = THIS_MODULE, 1432 .close = udp_lib_close, 1433 .connect = ip6_datagram_connect, 1434 .disconnect = udp_disconnect, 1435 .ioctl = udp_ioctl, 1436 .destroy = udpv6_destroy_sock, 1437 .setsockopt = udpv6_setsockopt, 1438 .getsockopt = udpv6_getsockopt, 1439 .sendmsg = udpv6_sendmsg, 1440 .recvmsg = udpv6_recvmsg, 1441 .backlog_rcv = __udpv6_queue_rcv_skb, 1442 .hash = udp_lib_hash, 1443 .unhash = udp_lib_unhash, 1444 .rehash = udp_v6_rehash, 1445 .get_port = udp_v6_get_port, 1446 .memory_allocated = &udp_memory_allocated, 1447 .sysctl_mem = sysctl_udp_mem, 1448 .sysctl_wmem = &sysctl_udp_wmem_min, 1449 .sysctl_rmem = &sysctl_udp_rmem_min, 1450 .obj_size = sizeof(struct udp6_sock), 1451 .slab_flags = SLAB_DESTROY_BY_RCU, 1452 .h.udp_table = &udp_table, 1453 #ifdef CONFIG_COMPAT 1454 .compat_setsockopt = compat_udpv6_setsockopt, 1455 .compat_getsockopt = compat_udpv6_getsockopt, 1456 #endif 1457 .clear_sk = sk_prot_clear_portaddr_nulls, 1458 }; 1459 1460 static struct inet_protosw udpv6_protosw = { 1461 .type = SOCK_DGRAM, 1462 .protocol = IPPROTO_UDP, 1463 .prot = &udpv6_prot, 1464 .ops = &inet6_dgram_ops, 1465 .no_check = UDP_CSUM_DEFAULT, 1466 .flags = INET_PROTOSW_PERMANENT, 1467 }; 1468 1469 1470 int __init udpv6_init(void) 1471 { 1472 int ret; 1473 1474 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1475 if (ret) 1476 goto out; 1477 1478 ret = inet6_register_protosw(&udpv6_protosw); 1479 if (ret) 1480 goto out_udpv6_protocol; 1481 out: 1482 return ret; 1483 1484 out_udpv6_protocol: 1485 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1486 goto out; 1487 } 1488 1489 void udpv6_exit(void) 1490 { 1491 inet6_unregister_protosw(&udpv6_protosw); 1492 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1493 } 1494