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; 453 454 if (is_udp4) { 455 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 456 &sin6->sin6_addr); 457 sin6->sin6_scope_id = 0; 458 } else { 459 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 460 sin6->sin6_scope_id = 461 ipv6_iface_scope_id(&sin6->sin6_addr, 462 IP6CB(skb)->iif); 463 } 464 465 } 466 if (is_udp4) { 467 if (inet->cmsg_flags) 468 ip_cmsg_recv(msg, skb); 469 } else { 470 if (np->rxopt.all) 471 ip6_datagram_recv_ctl(sk, msg, skb); 472 } 473 474 err = copied; 475 if (flags & MSG_TRUNC) 476 err = ulen; 477 478 out_free: 479 skb_free_datagram_locked(sk, skb); 480 out: 481 return err; 482 483 csum_copy_err: 484 slow = lock_sock_fast(sk); 485 if (!skb_kill_datagram(sk, skb, flags)) { 486 if (is_udp4) 487 UDP_INC_STATS_USER(sock_net(sk), 488 UDP_MIB_INERRORS, is_udplite); 489 else 490 UDP6_INC_STATS_USER(sock_net(sk), 491 UDP_MIB_INERRORS, is_udplite); 492 } 493 unlock_sock_fast(sk, slow); 494 495 if (noblock) 496 return -EAGAIN; 497 498 /* starting over for a new packet */ 499 msg->msg_flags &= ~MSG_TRUNC; 500 goto try_again; 501 } 502 503 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 504 u8 type, u8 code, int offset, __be32 info, 505 struct udp_table *udptable) 506 { 507 struct ipv6_pinfo *np; 508 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 509 const struct in6_addr *saddr = &hdr->saddr; 510 const struct in6_addr *daddr = &hdr->daddr; 511 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 512 struct sock *sk; 513 int err; 514 515 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 516 saddr, uh->source, inet6_iif(skb), udptable); 517 if (sk == NULL) 518 return; 519 520 if (type == ICMPV6_PKT_TOOBIG) 521 ip6_sk_update_pmtu(skb, sk, info); 522 if (type == NDISC_REDIRECT) 523 ip6_sk_redirect(skb, sk); 524 525 np = inet6_sk(sk); 526 527 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 528 goto out; 529 530 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 531 goto out; 532 533 if (np->recverr) 534 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 535 536 sk->sk_err = err; 537 sk->sk_error_report(sk); 538 out: 539 sock_put(sk); 540 } 541 542 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 543 { 544 int rc; 545 546 if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) 547 sock_rps_save_rxhash(sk, skb); 548 549 rc = sock_queue_rcv_skb(sk, skb); 550 if (rc < 0) { 551 int is_udplite = IS_UDPLITE(sk); 552 553 /* Note that an ENOMEM error is charged twice */ 554 if (rc == -ENOMEM) 555 UDP6_INC_STATS_BH(sock_net(sk), 556 UDP_MIB_RCVBUFERRORS, is_udplite); 557 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 558 kfree_skb(skb); 559 return -1; 560 } 561 return 0; 562 } 563 564 static __inline__ void udpv6_err(struct sk_buff *skb, 565 struct inet6_skb_parm *opt, u8 type, 566 u8 code, int offset, __be32 info ) 567 { 568 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 569 } 570 571 static struct static_key udpv6_encap_needed __read_mostly; 572 void udpv6_encap_enable(void) 573 { 574 if (!static_key_enabled(&udpv6_encap_needed)) 575 static_key_slow_inc(&udpv6_encap_needed); 576 } 577 EXPORT_SYMBOL(udpv6_encap_enable); 578 579 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 580 { 581 struct udp_sock *up = udp_sk(sk); 582 int rc; 583 int is_udplite = IS_UDPLITE(sk); 584 585 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 586 goto drop; 587 588 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 589 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 590 591 /* 592 * This is an encapsulation socket so pass the skb to 593 * the socket's udp_encap_rcv() hook. Otherwise, just 594 * fall through and pass this up the UDP socket. 595 * up->encap_rcv() returns the following value: 596 * =0 if skb was successfully passed to the encap 597 * handler or was discarded by it. 598 * >0 if skb should be passed on to UDP. 599 * <0 if skb should be resubmitted as proto -N 600 */ 601 602 /* if we're overly short, let UDP handle it */ 603 encap_rcv = ACCESS_ONCE(up->encap_rcv); 604 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 605 int ret; 606 607 ret = encap_rcv(sk, skb); 608 if (ret <= 0) { 609 UDP_INC_STATS_BH(sock_net(sk), 610 UDP_MIB_INDATAGRAMS, 611 is_udplite); 612 return -ret; 613 } 614 } 615 616 /* FALLTHROUGH -- it's a UDP Packet */ 617 } 618 619 /* 620 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 621 */ 622 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 623 624 if (up->pcrlen == 0) { /* full coverage was set */ 625 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 626 " %d while full coverage %d requested\n", 627 UDP_SKB_CB(skb)->cscov, skb->len); 628 goto drop; 629 } 630 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 631 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 632 "too small, need min %d\n", 633 UDP_SKB_CB(skb)->cscov, up->pcrlen); 634 goto drop; 635 } 636 } 637 638 if (rcu_access_pointer(sk->sk_filter)) { 639 if (udp_lib_checksum_complete(skb)) 640 goto drop; 641 } 642 643 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 644 goto drop; 645 646 skb_dst_drop(skb); 647 648 bh_lock_sock(sk); 649 rc = 0; 650 if (!sock_owned_by_user(sk)) 651 rc = __udpv6_queue_rcv_skb(sk, skb); 652 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 653 bh_unlock_sock(sk); 654 goto drop; 655 } 656 bh_unlock_sock(sk); 657 658 return rc; 659 drop: 660 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 661 atomic_inc(&sk->sk_drops); 662 kfree_skb(skb); 663 return -1; 664 } 665 666 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 667 __be16 loc_port, const struct in6_addr *loc_addr, 668 __be16 rmt_port, const struct in6_addr *rmt_addr, 669 int dif) 670 { 671 struct hlist_nulls_node *node; 672 struct sock *s = sk; 673 unsigned short num = ntohs(loc_port); 674 675 sk_nulls_for_each_from(s, node) { 676 struct inet_sock *inet = inet_sk(s); 677 678 if (!net_eq(sock_net(s), net)) 679 continue; 680 681 if (udp_sk(s)->udp_port_hash == num && 682 s->sk_family == PF_INET6) { 683 struct ipv6_pinfo *np = inet6_sk(s); 684 if (inet->inet_dport) { 685 if (inet->inet_dport != rmt_port) 686 continue; 687 } 688 if (!ipv6_addr_any(&np->daddr) && 689 !ipv6_addr_equal(&np->daddr, rmt_addr)) 690 continue; 691 692 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 693 continue; 694 695 if (!ipv6_addr_any(&np->rcv_saddr)) { 696 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 697 continue; 698 } 699 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 700 continue; 701 return s; 702 } 703 } 704 return NULL; 705 } 706 707 static void flush_stack(struct sock **stack, unsigned int count, 708 struct sk_buff *skb, unsigned int final) 709 { 710 struct sk_buff *skb1 = NULL; 711 struct sock *sk; 712 unsigned int i; 713 714 for (i = 0; i < count; i++) { 715 sk = stack[i]; 716 if (likely(skb1 == NULL)) 717 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 718 if (!skb1) { 719 atomic_inc(&sk->sk_drops); 720 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 721 IS_UDPLITE(sk)); 722 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 723 IS_UDPLITE(sk)); 724 } 725 726 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 727 skb1 = NULL; 728 } 729 if (unlikely(skb1)) 730 kfree_skb(skb1); 731 } 732 /* 733 * Note: called only from the BH handler context, 734 * so we don't need to lock the hashes. 735 */ 736 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 737 const struct in6_addr *saddr, const struct in6_addr *daddr, 738 struct udp_table *udptable) 739 { 740 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 741 const struct udphdr *uh = udp_hdr(skb); 742 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 743 int dif; 744 unsigned int i, count = 0; 745 746 spin_lock(&hslot->lock); 747 sk = sk_nulls_head(&hslot->head); 748 dif = inet6_iif(skb); 749 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 750 while (sk) { 751 stack[count++] = sk; 752 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 753 uh->source, saddr, dif); 754 if (unlikely(count == ARRAY_SIZE(stack))) { 755 if (!sk) 756 break; 757 flush_stack(stack, count, skb, ~0); 758 count = 0; 759 } 760 } 761 /* 762 * before releasing the lock, we must take reference on sockets 763 */ 764 for (i = 0; i < count; i++) 765 sock_hold(stack[i]); 766 767 spin_unlock(&hslot->lock); 768 769 if (count) { 770 flush_stack(stack, count, skb, count - 1); 771 772 for (i = 0; i < count; i++) 773 sock_put(stack[i]); 774 } else { 775 kfree_skb(skb); 776 } 777 return 0; 778 } 779 780 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 781 int proto) 782 { 783 struct net *net = dev_net(skb->dev); 784 struct sock *sk; 785 struct udphdr *uh; 786 const struct in6_addr *saddr, *daddr; 787 u32 ulen = 0; 788 789 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 790 goto discard; 791 792 saddr = &ipv6_hdr(skb)->saddr; 793 daddr = &ipv6_hdr(skb)->daddr; 794 uh = udp_hdr(skb); 795 796 ulen = ntohs(uh->len); 797 if (ulen > skb->len) 798 goto short_packet; 799 800 if (proto == IPPROTO_UDP) { 801 /* UDP validates ulen. */ 802 803 /* Check for jumbo payload */ 804 if (ulen == 0) 805 ulen = skb->len; 806 807 if (ulen < sizeof(*uh)) 808 goto short_packet; 809 810 if (ulen < skb->len) { 811 if (pskb_trim_rcsum(skb, ulen)) 812 goto short_packet; 813 saddr = &ipv6_hdr(skb)->saddr; 814 daddr = &ipv6_hdr(skb)->daddr; 815 uh = udp_hdr(skb); 816 } 817 } 818 819 if (udp6_csum_init(skb, uh, proto)) 820 goto discard; 821 822 /* 823 * Multicast receive code 824 */ 825 if (ipv6_addr_is_multicast(daddr)) 826 return __udp6_lib_mcast_deliver(net, skb, 827 saddr, daddr, udptable); 828 829 /* Unicast */ 830 831 /* 832 * check socket cache ... must talk to Alan about his plans 833 * for sock caches... i'll skip this for now. 834 */ 835 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 836 if (sk != NULL) { 837 int ret = udpv6_queue_rcv_skb(sk, skb); 838 sock_put(sk); 839 840 /* a return value > 0 means to resubmit the input, but 841 * it wants the return to be -protocol, or 0 842 */ 843 if (ret > 0) 844 return -ret; 845 846 return 0; 847 } 848 849 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 850 goto discard; 851 852 if (udp_lib_checksum_complete(skb)) 853 goto discard; 854 855 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 856 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 857 858 kfree_skb(skb); 859 return 0; 860 861 short_packet: 862 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 863 proto == IPPROTO_UDPLITE ? "-Lite" : "", 864 saddr, 865 ntohs(uh->source), 866 ulen, 867 skb->len, 868 daddr, 869 ntohs(uh->dest)); 870 871 discard: 872 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 873 kfree_skb(skb); 874 return 0; 875 } 876 877 static __inline__ int udpv6_rcv(struct sk_buff *skb) 878 { 879 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 880 } 881 882 /* 883 * Throw away all pending data and cancel the corking. Socket is locked. 884 */ 885 static void udp_v6_flush_pending_frames(struct sock *sk) 886 { 887 struct udp_sock *up = udp_sk(sk); 888 889 if (up->pending == AF_INET) 890 udp_flush_pending_frames(sk); 891 else if (up->pending) { 892 up->len = 0; 893 up->pending = 0; 894 ip6_flush_pending_frames(sk); 895 } 896 } 897 898 /** 899 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 900 * @sk: socket we are sending on 901 * @skb: sk_buff containing the filled-in UDP header 902 * (checksum field must be zeroed out) 903 */ 904 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 905 const struct in6_addr *saddr, 906 const struct in6_addr *daddr, int len) 907 { 908 unsigned int offset; 909 struct udphdr *uh = udp_hdr(skb); 910 __wsum csum = 0; 911 912 if (skb_queue_len(&sk->sk_write_queue) == 1) { 913 /* Only one fragment on the socket. */ 914 skb->csum_start = skb_transport_header(skb) - skb->head; 915 skb->csum_offset = offsetof(struct udphdr, check); 916 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 917 } else { 918 /* 919 * HW-checksum won't work as there are two or more 920 * fragments on the socket so that all csums of sk_buffs 921 * should be together 922 */ 923 offset = skb_transport_offset(skb); 924 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 925 926 skb->ip_summed = CHECKSUM_NONE; 927 928 skb_queue_walk(&sk->sk_write_queue, skb) { 929 csum = csum_add(csum, skb->csum); 930 } 931 932 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 933 csum); 934 if (uh->check == 0) 935 uh->check = CSUM_MANGLED_0; 936 } 937 } 938 939 /* 940 * Sending 941 */ 942 943 static int udp_v6_push_pending_frames(struct sock *sk) 944 { 945 struct sk_buff *skb; 946 struct udphdr *uh; 947 struct udp_sock *up = udp_sk(sk); 948 struct inet_sock *inet = inet_sk(sk); 949 struct flowi6 *fl6 = &inet->cork.fl.u.ip6; 950 int err = 0; 951 int is_udplite = IS_UDPLITE(sk); 952 __wsum csum = 0; 953 954 /* Grab the skbuff where UDP header space exists. */ 955 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 956 goto out; 957 958 /* 959 * Create a UDP header 960 */ 961 uh = udp_hdr(skb); 962 uh->source = fl6->fl6_sport; 963 uh->dest = fl6->fl6_dport; 964 uh->len = htons(up->len); 965 uh->check = 0; 966 967 if (is_udplite) 968 csum = udplite_csum_outgoing(sk, skb); 969 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 970 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 971 up->len); 972 goto send; 973 } else 974 csum = udp_csum_outgoing(sk, skb); 975 976 /* add protocol-dependent pseudo-header */ 977 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 978 up->len, fl6->flowi6_proto, csum); 979 if (uh->check == 0) 980 uh->check = CSUM_MANGLED_0; 981 982 send: 983 err = ip6_push_pending_frames(sk); 984 if (err) { 985 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 986 UDP6_INC_STATS_USER(sock_net(sk), 987 UDP_MIB_SNDBUFERRORS, is_udplite); 988 err = 0; 989 } 990 } else 991 UDP6_INC_STATS_USER(sock_net(sk), 992 UDP_MIB_OUTDATAGRAMS, is_udplite); 993 out: 994 up->len = 0; 995 up->pending = 0; 996 return err; 997 } 998 999 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 1000 struct msghdr *msg, size_t len) 1001 { 1002 struct ipv6_txoptions opt_space; 1003 struct udp_sock *up = udp_sk(sk); 1004 struct inet_sock *inet = inet_sk(sk); 1005 struct ipv6_pinfo *np = inet6_sk(sk); 1006 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 1007 struct in6_addr *daddr, *final_p, final; 1008 struct ipv6_txoptions *opt = NULL; 1009 struct ip6_flowlabel *flowlabel = NULL; 1010 struct flowi6 fl6; 1011 struct dst_entry *dst; 1012 int addr_len = msg->msg_namelen; 1013 int ulen = len; 1014 int hlimit = -1; 1015 int tclass = -1; 1016 int dontfrag = -1; 1017 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1018 int err; 1019 int connected = 0; 1020 int is_udplite = IS_UDPLITE(sk); 1021 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1022 1023 /* destination address check */ 1024 if (sin6) { 1025 if (addr_len < offsetof(struct sockaddr, sa_data)) 1026 return -EINVAL; 1027 1028 switch (sin6->sin6_family) { 1029 case AF_INET6: 1030 if (addr_len < SIN6_LEN_RFC2133) 1031 return -EINVAL; 1032 daddr = &sin6->sin6_addr; 1033 break; 1034 case AF_INET: 1035 goto do_udp_sendmsg; 1036 case AF_UNSPEC: 1037 msg->msg_name = sin6 = NULL; 1038 msg->msg_namelen = addr_len = 0; 1039 daddr = NULL; 1040 break; 1041 default: 1042 return -EINVAL; 1043 } 1044 } else if (!up->pending) { 1045 if (sk->sk_state != TCP_ESTABLISHED) 1046 return -EDESTADDRREQ; 1047 daddr = &np->daddr; 1048 } else 1049 daddr = NULL; 1050 1051 if (daddr) { 1052 if (ipv6_addr_v4mapped(daddr)) { 1053 struct sockaddr_in sin; 1054 sin.sin_family = AF_INET; 1055 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1056 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1057 msg->msg_name = &sin; 1058 msg->msg_namelen = sizeof(sin); 1059 do_udp_sendmsg: 1060 if (__ipv6_only_sock(sk)) 1061 return -ENETUNREACH; 1062 return udp_sendmsg(iocb, sk, msg, len); 1063 } 1064 } 1065 1066 if (up->pending == AF_INET) 1067 return udp_sendmsg(iocb, sk, msg, len); 1068 1069 /* Rough check on arithmetic overflow, 1070 better check is made in ip6_append_data(). 1071 */ 1072 if (len > INT_MAX - sizeof(struct udphdr)) 1073 return -EMSGSIZE; 1074 1075 if (up->pending) { 1076 /* 1077 * There are pending frames. 1078 * The socket lock must be held while it's corked. 1079 */ 1080 lock_sock(sk); 1081 if (likely(up->pending)) { 1082 if (unlikely(up->pending != AF_INET6)) { 1083 release_sock(sk); 1084 return -EAFNOSUPPORT; 1085 } 1086 dst = NULL; 1087 goto do_append_data; 1088 } 1089 release_sock(sk); 1090 } 1091 ulen += sizeof(struct udphdr); 1092 1093 memset(&fl6, 0, sizeof(fl6)); 1094 1095 if (sin6) { 1096 if (sin6->sin6_port == 0) 1097 return -EINVAL; 1098 1099 fl6.fl6_dport = sin6->sin6_port; 1100 daddr = &sin6->sin6_addr; 1101 1102 if (np->sndflow) { 1103 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1104 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1105 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1106 if (flowlabel == NULL) 1107 return -EINVAL; 1108 daddr = &flowlabel->dst; 1109 } 1110 } 1111 1112 /* 1113 * Otherwise it will be difficult to maintain 1114 * sk->sk_dst_cache. 1115 */ 1116 if (sk->sk_state == TCP_ESTABLISHED && 1117 ipv6_addr_equal(daddr, &np->daddr)) 1118 daddr = &np->daddr; 1119 1120 if (addr_len >= sizeof(struct sockaddr_in6) && 1121 sin6->sin6_scope_id && 1122 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1123 fl6.flowi6_oif = sin6->sin6_scope_id; 1124 } else { 1125 if (sk->sk_state != TCP_ESTABLISHED) 1126 return -EDESTADDRREQ; 1127 1128 fl6.fl6_dport = inet->inet_dport; 1129 daddr = &np->daddr; 1130 fl6.flowlabel = np->flow_label; 1131 connected = 1; 1132 } 1133 1134 if (!fl6.flowi6_oif) 1135 fl6.flowi6_oif = sk->sk_bound_dev_if; 1136 1137 if (!fl6.flowi6_oif) 1138 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1139 1140 fl6.flowi6_mark = sk->sk_mark; 1141 1142 if (msg->msg_controllen) { 1143 opt = &opt_space; 1144 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1145 opt->tot_len = sizeof(*opt); 1146 1147 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1148 &hlimit, &tclass, &dontfrag); 1149 if (err < 0) { 1150 fl6_sock_release(flowlabel); 1151 return err; 1152 } 1153 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1154 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1155 if (flowlabel == NULL) 1156 return -EINVAL; 1157 } 1158 if (!(opt->opt_nflen|opt->opt_flen)) 1159 opt = NULL; 1160 connected = 0; 1161 } 1162 if (opt == NULL) 1163 opt = np->opt; 1164 if (flowlabel) 1165 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1166 opt = ipv6_fixup_options(&opt_space, opt); 1167 1168 fl6.flowi6_proto = sk->sk_protocol; 1169 if (!ipv6_addr_any(daddr)) 1170 fl6.daddr = *daddr; 1171 else 1172 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1173 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1174 fl6.saddr = np->saddr; 1175 fl6.fl6_sport = inet->inet_sport; 1176 1177 final_p = fl6_update_dst(&fl6, opt, &final); 1178 if (final_p) 1179 connected = 0; 1180 1181 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1182 fl6.flowi6_oif = np->mcast_oif; 1183 connected = 0; 1184 } else if (!fl6.flowi6_oif) 1185 fl6.flowi6_oif = np->ucast_oif; 1186 1187 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1188 1189 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); 1190 if (IS_ERR(dst)) { 1191 err = PTR_ERR(dst); 1192 dst = NULL; 1193 goto out; 1194 } 1195 1196 if (hlimit < 0) { 1197 if (ipv6_addr_is_multicast(&fl6.daddr)) 1198 hlimit = np->mcast_hops; 1199 else 1200 hlimit = np->hop_limit; 1201 if (hlimit < 0) 1202 hlimit = ip6_dst_hoplimit(dst); 1203 } 1204 1205 if (tclass < 0) 1206 tclass = np->tclass; 1207 1208 if (dontfrag < 0) 1209 dontfrag = np->dontfrag; 1210 1211 if (msg->msg_flags&MSG_CONFIRM) 1212 goto do_confirm; 1213 back_from_confirm: 1214 1215 lock_sock(sk); 1216 if (unlikely(up->pending)) { 1217 /* The socket is already corked while preparing it. */ 1218 /* ... which is an evident application bug. --ANK */ 1219 release_sock(sk); 1220 1221 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1222 err = -EINVAL; 1223 goto out; 1224 } 1225 1226 up->pending = AF_INET6; 1227 1228 do_append_data: 1229 up->len += ulen; 1230 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1231 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1232 sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1233 (struct rt6_info*)dst, 1234 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1235 if (err) 1236 udp_v6_flush_pending_frames(sk); 1237 else if (!corkreq) 1238 err = udp_v6_push_pending_frames(sk); 1239 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1240 up->pending = 0; 1241 1242 if (dst) { 1243 if (connected) { 1244 ip6_dst_store(sk, dst, 1245 ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 1246 &np->daddr : NULL, 1247 #ifdef CONFIG_IPV6_SUBTREES 1248 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1249 &np->saddr : 1250 #endif 1251 NULL); 1252 } else { 1253 dst_release(dst); 1254 } 1255 dst = NULL; 1256 } 1257 1258 if (err > 0) 1259 err = np->recverr ? net_xmit_errno(err) : 0; 1260 release_sock(sk); 1261 out: 1262 dst_release(dst); 1263 fl6_sock_release(flowlabel); 1264 if (!err) 1265 return len; 1266 /* 1267 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1268 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1269 * we don't have a good statistic (IpOutDiscards but it can be too many 1270 * things). We could add another new stat but at least for now that 1271 * seems like overkill. 1272 */ 1273 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1274 UDP6_INC_STATS_USER(sock_net(sk), 1275 UDP_MIB_SNDBUFERRORS, is_udplite); 1276 } 1277 return err; 1278 1279 do_confirm: 1280 dst_confirm(dst); 1281 if (!(msg->msg_flags&MSG_PROBE) || len) 1282 goto back_from_confirm; 1283 err = 0; 1284 goto out; 1285 } 1286 1287 void udpv6_destroy_sock(struct sock *sk) 1288 { 1289 struct udp_sock *up = udp_sk(sk); 1290 lock_sock(sk); 1291 udp_v6_flush_pending_frames(sk); 1292 release_sock(sk); 1293 1294 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1295 void (*encap_destroy)(struct sock *sk); 1296 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1297 if (encap_destroy) 1298 encap_destroy(sk); 1299 } 1300 1301 inet6_destroy_sock(sk); 1302 } 1303 1304 /* 1305 * Socket option code for UDP 1306 */ 1307 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1308 char __user *optval, unsigned int optlen) 1309 { 1310 if (level == SOL_UDP || level == SOL_UDPLITE) 1311 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1312 udp_v6_push_pending_frames); 1313 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1314 } 1315 1316 #ifdef CONFIG_COMPAT 1317 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1318 char __user *optval, unsigned int optlen) 1319 { 1320 if (level == SOL_UDP || level == SOL_UDPLITE) 1321 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1322 udp_v6_push_pending_frames); 1323 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1324 } 1325 #endif 1326 1327 int 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 ipv6_getsockopt(sk, level, optname, optval, optlen); 1333 } 1334 1335 #ifdef CONFIG_COMPAT 1336 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1337 char __user *optval, int __user *optlen) 1338 { 1339 if (level == SOL_UDP || level == SOL_UDPLITE) 1340 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1341 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1342 } 1343 #endif 1344 1345 static const struct inet6_protocol udpv6_protocol = { 1346 .handler = udpv6_rcv, 1347 .err_handler = udpv6_err, 1348 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1349 }; 1350 1351 /* ------------------------------------------------------------------------ */ 1352 #ifdef CONFIG_PROC_FS 1353 1354 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1355 { 1356 struct inet_sock *inet = inet_sk(sp); 1357 struct ipv6_pinfo *np = inet6_sk(sp); 1358 const struct in6_addr *dest, *src; 1359 __u16 destp, srcp; 1360 1361 dest = &np->daddr; 1362 src = &np->rcv_saddr; 1363 destp = ntohs(inet->inet_dport); 1364 srcp = ntohs(inet->inet_sport); 1365 seq_printf(seq, 1366 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1367 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1368 bucket, 1369 src->s6_addr32[0], src->s6_addr32[1], 1370 src->s6_addr32[2], src->s6_addr32[3], srcp, 1371 dest->s6_addr32[0], dest->s6_addr32[1], 1372 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1373 sp->sk_state, 1374 sk_wmem_alloc_get(sp), 1375 sk_rmem_alloc_get(sp), 1376 0, 0L, 0, 1377 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1378 0, 1379 sock_i_ino(sp), 1380 atomic_read(&sp->sk_refcnt), sp, 1381 atomic_read(&sp->sk_drops)); 1382 } 1383 1384 int udp6_seq_show(struct seq_file *seq, void *v) 1385 { 1386 if (v == SEQ_START_TOKEN) 1387 seq_printf(seq, 1388 " sl " 1389 "local_address " 1390 "remote_address " 1391 "st tx_queue rx_queue tr tm->when retrnsmt" 1392 " uid timeout inode ref pointer drops\n"); 1393 else 1394 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1395 return 0; 1396 } 1397 1398 static const struct file_operations udp6_afinfo_seq_fops = { 1399 .owner = THIS_MODULE, 1400 .open = udp_seq_open, 1401 .read = seq_read, 1402 .llseek = seq_lseek, 1403 .release = seq_release_net 1404 }; 1405 1406 static struct udp_seq_afinfo udp6_seq_afinfo = { 1407 .name = "udp6", 1408 .family = AF_INET6, 1409 .udp_table = &udp_table, 1410 .seq_fops = &udp6_afinfo_seq_fops, 1411 .seq_ops = { 1412 .show = udp6_seq_show, 1413 }, 1414 }; 1415 1416 int __net_init udp6_proc_init(struct net *net) 1417 { 1418 return udp_proc_register(net, &udp6_seq_afinfo); 1419 } 1420 1421 void udp6_proc_exit(struct net *net) { 1422 udp_proc_unregister(net, &udp6_seq_afinfo); 1423 } 1424 #endif /* CONFIG_PROC_FS */ 1425 1426 /* ------------------------------------------------------------------------ */ 1427 1428 struct proto udpv6_prot = { 1429 .name = "UDPv6", 1430 .owner = THIS_MODULE, 1431 .close = udp_lib_close, 1432 .connect = ip6_datagram_connect, 1433 .disconnect = udp_disconnect, 1434 .ioctl = udp_ioctl, 1435 .destroy = udpv6_destroy_sock, 1436 .setsockopt = udpv6_setsockopt, 1437 .getsockopt = udpv6_getsockopt, 1438 .sendmsg = udpv6_sendmsg, 1439 .recvmsg = udpv6_recvmsg, 1440 .backlog_rcv = __udpv6_queue_rcv_skb, 1441 .hash = udp_lib_hash, 1442 .unhash = udp_lib_unhash, 1443 .rehash = udp_v6_rehash, 1444 .get_port = udp_v6_get_port, 1445 .memory_allocated = &udp_memory_allocated, 1446 .sysctl_mem = sysctl_udp_mem, 1447 .sysctl_wmem = &sysctl_udp_wmem_min, 1448 .sysctl_rmem = &sysctl_udp_rmem_min, 1449 .obj_size = sizeof(struct udp6_sock), 1450 .slab_flags = SLAB_DESTROY_BY_RCU, 1451 .h.udp_table = &udp_table, 1452 #ifdef CONFIG_COMPAT 1453 .compat_setsockopt = compat_udpv6_setsockopt, 1454 .compat_getsockopt = compat_udpv6_getsockopt, 1455 #endif 1456 .clear_sk = sk_prot_clear_portaddr_nulls, 1457 }; 1458 1459 static struct inet_protosw udpv6_protosw = { 1460 .type = SOCK_DGRAM, 1461 .protocol = IPPROTO_UDP, 1462 .prot = &udpv6_prot, 1463 .ops = &inet6_dgram_ops, 1464 .no_check = UDP_CSUM_DEFAULT, 1465 .flags = INET_PROTOSW_PERMANENT, 1466 }; 1467 1468 1469 int __init udpv6_init(void) 1470 { 1471 int ret; 1472 1473 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1474 if (ret) 1475 goto out; 1476 1477 ret = inet6_register_protosw(&udpv6_protosw); 1478 if (ret) 1479 goto out_udpv6_protocol; 1480 out: 1481 return ret; 1482 1483 out_udpv6_protocol: 1484 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1485 goto out; 1486 } 1487 1488 void udpv6_exit(void) 1489 { 1490 inet6_unregister_protosw(&udpv6_protosw); 1491 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1492 } 1493