1 /* 2 * UDP over IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/udp.c 9 * 10 * Fixes: 11 * Hideaki YOSHIFUJI : sin6_scope_id support 12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14 * a single port at the same time. 15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 */ 23 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/ipv6.h> 33 #include <linux/icmpv6.h> 34 #include <linux/init.h> 35 #include <linux/module.h> 36 #include <linux/skbuff.h> 37 #include <linux/slab.h> 38 #include <asm/uaccess.h> 39 40 #include <net/ndisc.h> 41 #include <net/protocol.h> 42 #include <net/transp_v6.h> 43 #include <net/ip6_route.h> 44 #include <net/raw.h> 45 #include <net/tcp_states.h> 46 #include <net/ip6_checksum.h> 47 #include <net/xfrm.h> 48 #include <net/inet6_hashtables.h> 49 #include <net/busy_poll.h> 50 51 #include <linux/proc_fs.h> 52 #include <linux/seq_file.h> 53 #include <trace/events/skb.h> 54 #include "udp_impl.h" 55 56 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 57 { 58 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 59 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 60 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk); 61 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); 62 int sk_ipv6only = ipv6_only_sock(sk); 63 int sk2_ipv6only = inet_v6_ipv6only(sk2); 64 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 65 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 66 67 /* if both are mapped, treat as IPv4 */ 68 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 69 return (!sk2_ipv6only && 70 (!sk1_rcv_saddr || !sk2_rcv_saddr || 71 sk1_rcv_saddr == sk2_rcv_saddr)); 72 73 if (addr_type2 == IPV6_ADDR_ANY && 74 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 75 return 1; 76 77 if (addr_type == IPV6_ADDR_ANY && 78 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 79 return 1; 80 81 if (sk2_rcv_saddr6 && 82 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 83 return 1; 84 85 return 0; 86 } 87 88 static unsigned int udp6_portaddr_hash(struct net *net, 89 const struct in6_addr *addr6, 90 unsigned int port) 91 { 92 unsigned int hash, mix = net_hash_mix(net); 93 94 if (ipv6_addr_any(addr6)) 95 hash = jhash_1word(0, mix); 96 else if (ipv6_addr_v4mapped(addr6)) 97 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 98 else 99 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 100 101 return hash ^ port; 102 } 103 104 105 int udp_v6_get_port(struct sock *sk, unsigned short snum) 106 { 107 unsigned int hash2_nulladdr = 108 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 109 unsigned int hash2_partial = 110 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); 111 112 /* precompute partial secondary hash */ 113 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 114 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 115 } 116 117 static void udp_v6_rehash(struct sock *sk) 118 { 119 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 120 &inet6_sk(sk)->rcv_saddr, 121 inet_sk(sk)->inet_num); 122 123 udp_lib_rehash(sk, new_hash); 124 } 125 126 static inline int compute_score(struct sock *sk, struct net *net, 127 unsigned short hnum, 128 const struct in6_addr *saddr, __be16 sport, 129 const struct in6_addr *daddr, __be16 dport, 130 int dif) 131 { 132 int score = -1; 133 134 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 135 sk->sk_family == PF_INET6) { 136 struct ipv6_pinfo *np = inet6_sk(sk); 137 struct inet_sock *inet = inet_sk(sk); 138 139 score = 0; 140 if (inet->inet_dport) { 141 if (inet->inet_dport != sport) 142 return -1; 143 score++; 144 } 145 if (!ipv6_addr_any(&np->rcv_saddr)) { 146 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 147 return -1; 148 score++; 149 } 150 if (!ipv6_addr_any(&np->daddr)) { 151 if (!ipv6_addr_equal(&np->daddr, saddr)) 152 return -1; 153 score++; 154 } 155 if (sk->sk_bound_dev_if) { 156 if (sk->sk_bound_dev_if != dif) 157 return -1; 158 score++; 159 } 160 } 161 return score; 162 } 163 164 #define SCORE2_MAX (1 + 1 + 1) 165 static inline int compute_score2(struct sock *sk, struct net *net, 166 const struct in6_addr *saddr, __be16 sport, 167 const struct in6_addr *daddr, unsigned short hnum, 168 int dif) 169 { 170 int score = -1; 171 172 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 173 sk->sk_family == PF_INET6) { 174 struct ipv6_pinfo *np = inet6_sk(sk); 175 struct inet_sock *inet = inet_sk(sk); 176 177 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 178 return -1; 179 score = 0; 180 if (inet->inet_dport) { 181 if (inet->inet_dport != sport) 182 return -1; 183 score++; 184 } 185 if (!ipv6_addr_any(&np->daddr)) { 186 if (!ipv6_addr_equal(&np->daddr, saddr)) 187 return -1; 188 score++; 189 } 190 if (sk->sk_bound_dev_if) { 191 if (sk->sk_bound_dev_if != dif) 192 return -1; 193 score++; 194 } 195 } 196 return score; 197 } 198 199 200 /* called with read_rcu_lock() */ 201 static struct sock *udp6_lib_lookup2(struct net *net, 202 const struct in6_addr *saddr, __be16 sport, 203 const struct in6_addr *daddr, unsigned int hnum, int dif, 204 struct udp_hslot *hslot2, unsigned int slot2) 205 { 206 struct sock *sk, *result; 207 struct hlist_nulls_node *node; 208 int score, badness, matches = 0, reuseport = 0; 209 u32 hash = 0; 210 211 begin: 212 result = NULL; 213 badness = -1; 214 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 215 score = compute_score2(sk, net, saddr, sport, 216 daddr, hnum, dif); 217 if (score > badness) { 218 result = sk; 219 badness = score; 220 reuseport = sk->sk_reuseport; 221 if (reuseport) { 222 hash = inet6_ehashfn(net, daddr, hnum, 223 saddr, sport); 224 matches = 1; 225 } else if (score == SCORE2_MAX) 226 goto exact_match; 227 } else if (score == badness && reuseport) { 228 matches++; 229 if (((u64)hash * matches) >> 32 == 0) 230 result = sk; 231 hash = next_pseudo_random32(hash); 232 } 233 } 234 /* 235 * if the nulls value we got at the end of this lookup is 236 * not the expected one, we must restart lookup. 237 * We probably met an item that was moved to another chain. 238 */ 239 if (get_nulls_value(node) != slot2) 240 goto begin; 241 242 if (result) { 243 exact_match: 244 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 245 result = NULL; 246 else if (unlikely(compute_score2(result, net, saddr, sport, 247 daddr, hnum, dif) < badness)) { 248 sock_put(result); 249 goto begin; 250 } 251 } 252 return result; 253 } 254 255 struct sock *__udp6_lib_lookup(struct net *net, 256 const struct in6_addr *saddr, __be16 sport, 257 const struct in6_addr *daddr, __be16 dport, 258 int dif, struct udp_table *udptable) 259 { 260 struct sock *sk, *result; 261 struct hlist_nulls_node *node; 262 unsigned short hnum = ntohs(dport); 263 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 264 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 265 int score, badness, matches = 0, reuseport = 0; 266 u32 hash = 0; 267 268 rcu_read_lock(); 269 if (hslot->count > 10) { 270 hash2 = udp6_portaddr_hash(net, daddr, hnum); 271 slot2 = hash2 & udptable->mask; 272 hslot2 = &udptable->hash2[slot2]; 273 if (hslot->count < hslot2->count) 274 goto begin; 275 276 result = udp6_lib_lookup2(net, saddr, sport, 277 daddr, hnum, dif, 278 hslot2, slot2); 279 if (!result) { 280 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 281 slot2 = hash2 & udptable->mask; 282 hslot2 = &udptable->hash2[slot2]; 283 if (hslot->count < hslot2->count) 284 goto begin; 285 286 result = udp6_lib_lookup2(net, saddr, sport, 287 &in6addr_any, hnum, dif, 288 hslot2, slot2); 289 } 290 rcu_read_unlock(); 291 return result; 292 } 293 begin: 294 result = NULL; 295 badness = -1; 296 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 297 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 298 if (score > badness) { 299 result = sk; 300 badness = score; 301 reuseport = sk->sk_reuseport; 302 if (reuseport) { 303 hash = inet6_ehashfn(net, daddr, hnum, 304 saddr, sport); 305 matches = 1; 306 } 307 } else if (score == badness && reuseport) { 308 matches++; 309 if (((u64)hash * matches) >> 32 == 0) 310 result = sk; 311 hash = next_pseudo_random32(hash); 312 } 313 } 314 /* 315 * if the nulls value we got at the end of this lookup is 316 * not the expected one, we must restart lookup. 317 * We probably met an item that was moved to another chain. 318 */ 319 if (get_nulls_value(node) != slot) 320 goto begin; 321 322 if (result) { 323 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 324 result = NULL; 325 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 326 daddr, dport, dif) < badness)) { 327 sock_put(result); 328 goto begin; 329 } 330 } 331 rcu_read_unlock(); 332 return result; 333 } 334 EXPORT_SYMBOL_GPL(__udp6_lib_lookup); 335 336 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 337 __be16 sport, __be16 dport, 338 struct udp_table *udptable) 339 { 340 struct sock *sk; 341 const struct ipv6hdr *iph = ipv6_hdr(skb); 342 343 if (unlikely(sk = skb_steal_sock(skb))) 344 return sk; 345 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 346 &iph->daddr, dport, inet6_iif(skb), 347 udptable); 348 } 349 350 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 351 const struct in6_addr *daddr, __be16 dport, int dif) 352 { 353 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 354 } 355 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 356 357 358 /* 359 * This should be easy, if there is something there we 360 * return it, otherwise we block. 361 */ 362 363 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 364 struct msghdr *msg, size_t len, 365 int noblock, int flags, int *addr_len) 366 { 367 struct ipv6_pinfo *np = inet6_sk(sk); 368 struct inet_sock *inet = inet_sk(sk); 369 struct sk_buff *skb; 370 unsigned int ulen, copied; 371 int peeked, off = 0; 372 int err; 373 int is_udplite = IS_UDPLITE(sk); 374 int is_udp4; 375 bool slow; 376 377 if (addr_len) 378 *addr_len = sizeof(struct sockaddr_in6); 379 380 if (flags & MSG_ERRQUEUE) 381 return ipv6_recv_error(sk, msg, len); 382 383 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 384 return ipv6_recv_rxpmtu(sk, msg, len); 385 386 try_again: 387 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 388 &peeked, &off, &err); 389 if (!skb) 390 goto out; 391 392 ulen = skb->len - sizeof(struct udphdr); 393 copied = len; 394 if (copied > ulen) 395 copied = ulen; 396 else if (copied < ulen) 397 msg->msg_flags |= MSG_TRUNC; 398 399 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 400 401 /* 402 * If checksum is needed at all, try to do it while copying the 403 * data. If the data is truncated, or if we only want a partial 404 * coverage checksum (UDP-Lite), do it before the copy. 405 */ 406 407 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 408 if (udp_lib_checksum_complete(skb)) 409 goto csum_copy_err; 410 } 411 412 if (skb_csum_unnecessary(skb)) 413 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 414 msg->msg_iov, copied); 415 else { 416 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 417 if (err == -EINVAL) 418 goto csum_copy_err; 419 } 420 if (unlikely(err)) { 421 trace_kfree_skb(skb, udpv6_recvmsg); 422 if (!peeked) { 423 atomic_inc(&sk->sk_drops); 424 if (is_udp4) 425 UDP_INC_STATS_USER(sock_net(sk), 426 UDP_MIB_INERRORS, 427 is_udplite); 428 else 429 UDP6_INC_STATS_USER(sock_net(sk), 430 UDP_MIB_INERRORS, 431 is_udplite); 432 } 433 goto out_free; 434 } 435 if (!peeked) { 436 if (is_udp4) 437 UDP_INC_STATS_USER(sock_net(sk), 438 UDP_MIB_INDATAGRAMS, is_udplite); 439 else 440 UDP6_INC_STATS_USER(sock_net(sk), 441 UDP_MIB_INDATAGRAMS, is_udplite); 442 } 443 444 sock_recv_ts_and_drops(msg, sk, skb); 445 446 /* Copy the address. */ 447 if (msg->msg_name) { 448 struct sockaddr_in6 *sin6; 449 450 sin6 = (struct sockaddr_in6 *) msg->msg_name; 451 sin6->sin6_family = AF_INET6; 452 sin6->sin6_port = udp_hdr(skb)->source; 453 sin6->sin6_flowinfo = 0; 454 455 if (is_udp4) { 456 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 457 &sin6->sin6_addr); 458 sin6->sin6_scope_id = 0; 459 } else { 460 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 461 sin6->sin6_scope_id = 462 ipv6_iface_scope_id(&sin6->sin6_addr, 463 IP6CB(skb)->iif); 464 } 465 466 } 467 if (is_udp4) { 468 if (inet->cmsg_flags) 469 ip_cmsg_recv(msg, skb); 470 } else { 471 if (np->rxopt.all) 472 ip6_datagram_recv_ctl(sk, msg, skb); 473 } 474 475 err = copied; 476 if (flags & MSG_TRUNC) 477 err = ulen; 478 479 out_free: 480 skb_free_datagram_locked(sk, skb); 481 out: 482 return err; 483 484 csum_copy_err: 485 slow = lock_sock_fast(sk); 486 if (!skb_kill_datagram(sk, skb, flags)) { 487 if (is_udp4) { 488 UDP_INC_STATS_USER(sock_net(sk), 489 UDP_MIB_CSUMERRORS, is_udplite); 490 UDP_INC_STATS_USER(sock_net(sk), 491 UDP_MIB_INERRORS, is_udplite); 492 } else { 493 UDP6_INC_STATS_USER(sock_net(sk), 494 UDP_MIB_CSUMERRORS, is_udplite); 495 UDP6_INC_STATS_USER(sock_net(sk), 496 UDP_MIB_INERRORS, is_udplite); 497 } 498 } 499 unlock_sock_fast(sk, slow); 500 501 if (noblock) 502 return -EAGAIN; 503 504 /* starting over for a new packet */ 505 msg->msg_flags &= ~MSG_TRUNC; 506 goto try_again; 507 } 508 509 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 510 u8 type, u8 code, int offset, __be32 info, 511 struct udp_table *udptable) 512 { 513 struct ipv6_pinfo *np; 514 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 515 const struct in6_addr *saddr = &hdr->saddr; 516 const struct in6_addr *daddr = &hdr->daddr; 517 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 518 struct sock *sk; 519 int err; 520 521 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 522 saddr, uh->source, inet6_iif(skb), udptable); 523 if (sk == NULL) 524 return; 525 526 if (type == ICMPV6_PKT_TOOBIG) 527 ip6_sk_update_pmtu(skb, sk, info); 528 if (type == NDISC_REDIRECT) { 529 ip6_sk_redirect(skb, sk); 530 goto out; 531 } 532 533 np = inet6_sk(sk); 534 535 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 536 goto out; 537 538 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 539 goto out; 540 541 if (np->recverr) 542 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 543 544 sk->sk_err = err; 545 sk->sk_error_report(sk); 546 out: 547 sock_put(sk); 548 } 549 550 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 551 { 552 int rc; 553 554 if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) 555 sock_rps_save_rxhash(sk, skb); 556 557 rc = sock_queue_rcv_skb(sk, skb); 558 if (rc < 0) { 559 int is_udplite = IS_UDPLITE(sk); 560 561 /* Note that an ENOMEM error is charged twice */ 562 if (rc == -ENOMEM) 563 UDP6_INC_STATS_BH(sock_net(sk), 564 UDP_MIB_RCVBUFERRORS, is_udplite); 565 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 566 kfree_skb(skb); 567 return -1; 568 } 569 return 0; 570 } 571 572 static __inline__ void udpv6_err(struct sk_buff *skb, 573 struct inet6_skb_parm *opt, u8 type, 574 u8 code, int offset, __be32 info ) 575 { 576 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 577 } 578 579 static struct static_key udpv6_encap_needed __read_mostly; 580 void udpv6_encap_enable(void) 581 { 582 if (!static_key_enabled(&udpv6_encap_needed)) 583 static_key_slow_inc(&udpv6_encap_needed); 584 } 585 EXPORT_SYMBOL(udpv6_encap_enable); 586 587 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 588 { 589 struct udp_sock *up = udp_sk(sk); 590 int rc; 591 int is_udplite = IS_UDPLITE(sk); 592 593 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 594 goto drop; 595 596 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 597 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 598 599 /* 600 * This is an encapsulation socket so pass the skb to 601 * the socket's udp_encap_rcv() hook. Otherwise, just 602 * fall through and pass this up the UDP socket. 603 * up->encap_rcv() returns the following value: 604 * =0 if skb was successfully passed to the encap 605 * handler or was discarded by it. 606 * >0 if skb should be passed on to UDP. 607 * <0 if skb should be resubmitted as proto -N 608 */ 609 610 /* if we're overly short, let UDP handle it */ 611 encap_rcv = ACCESS_ONCE(up->encap_rcv); 612 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 613 int ret; 614 615 ret = encap_rcv(sk, skb); 616 if (ret <= 0) { 617 UDP_INC_STATS_BH(sock_net(sk), 618 UDP_MIB_INDATAGRAMS, 619 is_udplite); 620 return -ret; 621 } 622 } 623 624 /* FALLTHROUGH -- it's a UDP Packet */ 625 } 626 627 /* 628 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 629 */ 630 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 631 632 if (up->pcrlen == 0) { /* full coverage was set */ 633 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 634 " %d while full coverage %d requested\n", 635 UDP_SKB_CB(skb)->cscov, skb->len); 636 goto drop; 637 } 638 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 639 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 640 "too small, need min %d\n", 641 UDP_SKB_CB(skb)->cscov, up->pcrlen); 642 goto drop; 643 } 644 } 645 646 if (rcu_access_pointer(sk->sk_filter)) { 647 if (udp_lib_checksum_complete(skb)) 648 goto csum_error; 649 } 650 651 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 652 goto drop; 653 654 skb_dst_drop(skb); 655 656 bh_lock_sock(sk); 657 rc = 0; 658 if (!sock_owned_by_user(sk)) 659 rc = __udpv6_queue_rcv_skb(sk, skb); 660 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 661 bh_unlock_sock(sk); 662 goto drop; 663 } 664 bh_unlock_sock(sk); 665 666 return rc; 667 csum_error: 668 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 669 drop: 670 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 671 atomic_inc(&sk->sk_drops); 672 kfree_skb(skb); 673 return -1; 674 } 675 676 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 677 __be16 loc_port, const struct in6_addr *loc_addr, 678 __be16 rmt_port, const struct in6_addr *rmt_addr, 679 int dif) 680 { 681 struct hlist_nulls_node *node; 682 struct sock *s = sk; 683 unsigned short num = ntohs(loc_port); 684 685 sk_nulls_for_each_from(s, node) { 686 struct inet_sock *inet = inet_sk(s); 687 688 if (!net_eq(sock_net(s), net)) 689 continue; 690 691 if (udp_sk(s)->udp_port_hash == num && 692 s->sk_family == PF_INET6) { 693 struct ipv6_pinfo *np = inet6_sk(s); 694 if (inet->inet_dport) { 695 if (inet->inet_dport != rmt_port) 696 continue; 697 } 698 if (!ipv6_addr_any(&np->daddr) && 699 !ipv6_addr_equal(&np->daddr, rmt_addr)) 700 continue; 701 702 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 703 continue; 704 705 if (!ipv6_addr_any(&np->rcv_saddr)) { 706 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 707 continue; 708 } 709 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 710 continue; 711 return s; 712 } 713 } 714 return NULL; 715 } 716 717 static void flush_stack(struct sock **stack, unsigned int count, 718 struct sk_buff *skb, unsigned int final) 719 { 720 struct sk_buff *skb1 = NULL; 721 struct sock *sk; 722 unsigned int i; 723 724 for (i = 0; i < count; i++) { 725 sk = stack[i]; 726 if (likely(skb1 == NULL)) 727 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 728 if (!skb1) { 729 atomic_inc(&sk->sk_drops); 730 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 731 IS_UDPLITE(sk)); 732 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 733 IS_UDPLITE(sk)); 734 } 735 736 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 737 skb1 = NULL; 738 } 739 if (unlikely(skb1)) 740 kfree_skb(skb1); 741 } 742 /* 743 * Note: called only from the BH handler context, 744 * so we don't need to lock the hashes. 745 */ 746 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 747 const struct in6_addr *saddr, const struct in6_addr *daddr, 748 struct udp_table *udptable) 749 { 750 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 751 const struct udphdr *uh = udp_hdr(skb); 752 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 753 int dif; 754 unsigned int i, count = 0; 755 756 spin_lock(&hslot->lock); 757 sk = sk_nulls_head(&hslot->head); 758 dif = inet6_iif(skb); 759 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 760 while (sk) { 761 stack[count++] = sk; 762 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 763 uh->source, saddr, dif); 764 if (unlikely(count == ARRAY_SIZE(stack))) { 765 if (!sk) 766 break; 767 flush_stack(stack, count, skb, ~0); 768 count = 0; 769 } 770 } 771 /* 772 * before releasing the lock, we must take reference on sockets 773 */ 774 for (i = 0; i < count; i++) 775 sock_hold(stack[i]); 776 777 spin_unlock(&hslot->lock); 778 779 if (count) { 780 flush_stack(stack, count, skb, count - 1); 781 782 for (i = 0; i < count; i++) 783 sock_put(stack[i]); 784 } else { 785 kfree_skb(skb); 786 } 787 return 0; 788 } 789 790 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 791 int proto) 792 { 793 struct net *net = dev_net(skb->dev); 794 struct sock *sk; 795 struct udphdr *uh; 796 const struct in6_addr *saddr, *daddr; 797 u32 ulen = 0; 798 799 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 800 goto discard; 801 802 saddr = &ipv6_hdr(skb)->saddr; 803 daddr = &ipv6_hdr(skb)->daddr; 804 uh = udp_hdr(skb); 805 806 ulen = ntohs(uh->len); 807 if (ulen > skb->len) 808 goto short_packet; 809 810 if (proto == IPPROTO_UDP) { 811 /* UDP validates ulen. */ 812 813 /* Check for jumbo payload */ 814 if (ulen == 0) 815 ulen = skb->len; 816 817 if (ulen < sizeof(*uh)) 818 goto short_packet; 819 820 if (ulen < skb->len) { 821 if (pskb_trim_rcsum(skb, ulen)) 822 goto short_packet; 823 saddr = &ipv6_hdr(skb)->saddr; 824 daddr = &ipv6_hdr(skb)->daddr; 825 uh = udp_hdr(skb); 826 } 827 } 828 829 if (udp6_csum_init(skb, uh, proto)) 830 goto csum_error; 831 832 /* 833 * Multicast receive code 834 */ 835 if (ipv6_addr_is_multicast(daddr)) 836 return __udp6_lib_mcast_deliver(net, skb, 837 saddr, daddr, udptable); 838 839 /* Unicast */ 840 841 /* 842 * check socket cache ... must talk to Alan about his plans 843 * for sock caches... i'll skip this for now. 844 */ 845 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 846 if (sk != NULL) { 847 int ret; 848 849 sk_mark_napi_id(sk, skb); 850 ret = udpv6_queue_rcv_skb(sk, skb); 851 sock_put(sk); 852 853 /* a return value > 0 means to resubmit the input, but 854 * it wants the return to be -protocol, or 0 855 */ 856 if (ret > 0) 857 return -ret; 858 859 return 0; 860 } 861 862 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 863 goto discard; 864 865 if (udp_lib_checksum_complete(skb)) 866 goto csum_error; 867 868 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 869 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 870 871 kfree_skb(skb); 872 return 0; 873 874 short_packet: 875 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 876 proto == IPPROTO_UDPLITE ? "-Lite" : "", 877 saddr, 878 ntohs(uh->source), 879 ulen, 880 skb->len, 881 daddr, 882 ntohs(uh->dest)); 883 goto discard; 884 csum_error: 885 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 886 discard: 887 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 888 kfree_skb(skb); 889 return 0; 890 } 891 892 static __inline__ int udpv6_rcv(struct sk_buff *skb) 893 { 894 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 895 } 896 897 /* 898 * Throw away all pending data and cancel the corking. Socket is locked. 899 */ 900 static void udp_v6_flush_pending_frames(struct sock *sk) 901 { 902 struct udp_sock *up = udp_sk(sk); 903 904 if (up->pending == AF_INET) 905 udp_flush_pending_frames(sk); 906 else if (up->pending) { 907 up->len = 0; 908 up->pending = 0; 909 ip6_flush_pending_frames(sk); 910 } 911 } 912 913 /** 914 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 915 * @sk: socket we are sending on 916 * @skb: sk_buff containing the filled-in UDP header 917 * (checksum field must be zeroed out) 918 */ 919 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 920 const struct in6_addr *saddr, 921 const struct in6_addr *daddr, int len) 922 { 923 unsigned int offset; 924 struct udphdr *uh = udp_hdr(skb); 925 __wsum csum = 0; 926 927 if (skb_queue_len(&sk->sk_write_queue) == 1) { 928 /* Only one fragment on the socket. */ 929 skb->csum_start = skb_transport_header(skb) - skb->head; 930 skb->csum_offset = offsetof(struct udphdr, check); 931 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 932 } else { 933 /* 934 * HW-checksum won't work as there are two or more 935 * fragments on the socket so that all csums of sk_buffs 936 * should be together 937 */ 938 offset = skb_transport_offset(skb); 939 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 940 941 skb->ip_summed = CHECKSUM_NONE; 942 943 skb_queue_walk(&sk->sk_write_queue, skb) { 944 csum = csum_add(csum, skb->csum); 945 } 946 947 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 948 csum); 949 if (uh->check == 0) 950 uh->check = CSUM_MANGLED_0; 951 } 952 } 953 954 /* 955 * Sending 956 */ 957 958 static int udp_v6_push_pending_frames(struct sock *sk) 959 { 960 struct sk_buff *skb; 961 struct udphdr *uh; 962 struct udp_sock *up = udp_sk(sk); 963 struct inet_sock *inet = inet_sk(sk); 964 struct flowi6 *fl6; 965 int err = 0; 966 int is_udplite = IS_UDPLITE(sk); 967 __wsum csum = 0; 968 969 if (up->pending == AF_INET) 970 return udp_push_pending_frames(sk); 971 972 fl6 = &inet->cork.fl.u.ip6; 973 974 /* Grab the skbuff where UDP header space exists. */ 975 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 976 goto out; 977 978 /* 979 * Create a UDP header 980 */ 981 uh = udp_hdr(skb); 982 uh->source = fl6->fl6_sport; 983 uh->dest = fl6->fl6_dport; 984 uh->len = htons(up->len); 985 uh->check = 0; 986 987 if (is_udplite) 988 csum = udplite_csum_outgoing(sk, skb); 989 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 990 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 991 up->len); 992 goto send; 993 } else 994 csum = udp_csum_outgoing(sk, skb); 995 996 /* add protocol-dependent pseudo-header */ 997 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 998 up->len, fl6->flowi6_proto, csum); 999 if (uh->check == 0) 1000 uh->check = CSUM_MANGLED_0; 1001 1002 send: 1003 err = ip6_push_pending_frames(sk); 1004 if (err) { 1005 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 1006 UDP6_INC_STATS_USER(sock_net(sk), 1007 UDP_MIB_SNDBUFERRORS, is_udplite); 1008 err = 0; 1009 } 1010 } else 1011 UDP6_INC_STATS_USER(sock_net(sk), 1012 UDP_MIB_OUTDATAGRAMS, is_udplite); 1013 out: 1014 up->len = 0; 1015 up->pending = 0; 1016 return err; 1017 } 1018 1019 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 1020 struct msghdr *msg, size_t len) 1021 { 1022 struct ipv6_txoptions opt_space; 1023 struct udp_sock *up = udp_sk(sk); 1024 struct inet_sock *inet = inet_sk(sk); 1025 struct ipv6_pinfo *np = inet6_sk(sk); 1026 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 1027 struct in6_addr *daddr, *final_p, final; 1028 struct ipv6_txoptions *opt = NULL; 1029 struct ip6_flowlabel *flowlabel = NULL; 1030 struct flowi6 fl6; 1031 struct dst_entry *dst; 1032 int addr_len = msg->msg_namelen; 1033 int ulen = len; 1034 int hlimit = -1; 1035 int tclass = -1; 1036 int dontfrag = -1; 1037 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 1038 int err; 1039 int connected = 0; 1040 int is_udplite = IS_UDPLITE(sk); 1041 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 1042 1043 /* destination address check */ 1044 if (sin6) { 1045 if (addr_len < offsetof(struct sockaddr, sa_data)) 1046 return -EINVAL; 1047 1048 switch (sin6->sin6_family) { 1049 case AF_INET6: 1050 if (addr_len < SIN6_LEN_RFC2133) 1051 return -EINVAL; 1052 daddr = &sin6->sin6_addr; 1053 break; 1054 case AF_INET: 1055 goto do_udp_sendmsg; 1056 case AF_UNSPEC: 1057 msg->msg_name = sin6 = NULL; 1058 msg->msg_namelen = addr_len = 0; 1059 daddr = NULL; 1060 break; 1061 default: 1062 return -EINVAL; 1063 } 1064 } else if (!up->pending) { 1065 if (sk->sk_state != TCP_ESTABLISHED) 1066 return -EDESTADDRREQ; 1067 daddr = &np->daddr; 1068 } else 1069 daddr = NULL; 1070 1071 if (daddr) { 1072 if (ipv6_addr_v4mapped(daddr)) { 1073 struct sockaddr_in sin; 1074 sin.sin_family = AF_INET; 1075 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1076 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1077 msg->msg_name = &sin; 1078 msg->msg_namelen = sizeof(sin); 1079 do_udp_sendmsg: 1080 if (__ipv6_only_sock(sk)) 1081 return -ENETUNREACH; 1082 return udp_sendmsg(iocb, sk, msg, len); 1083 } 1084 } 1085 1086 if (up->pending == AF_INET) 1087 return udp_sendmsg(iocb, sk, msg, len); 1088 1089 /* Rough check on arithmetic overflow, 1090 better check is made in ip6_append_data(). 1091 */ 1092 if (len > INT_MAX - sizeof(struct udphdr)) 1093 return -EMSGSIZE; 1094 1095 if (up->pending) { 1096 /* 1097 * There are pending frames. 1098 * The socket lock must be held while it's corked. 1099 */ 1100 lock_sock(sk); 1101 if (likely(up->pending)) { 1102 if (unlikely(up->pending != AF_INET6)) { 1103 release_sock(sk); 1104 return -EAFNOSUPPORT; 1105 } 1106 dst = NULL; 1107 goto do_append_data; 1108 } 1109 release_sock(sk); 1110 } 1111 ulen += sizeof(struct udphdr); 1112 1113 memset(&fl6, 0, sizeof(fl6)); 1114 1115 if (sin6) { 1116 if (sin6->sin6_port == 0) 1117 return -EINVAL; 1118 1119 fl6.fl6_dport = sin6->sin6_port; 1120 daddr = &sin6->sin6_addr; 1121 1122 if (np->sndflow) { 1123 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1124 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1125 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1126 if (flowlabel == NULL) 1127 return -EINVAL; 1128 daddr = &flowlabel->dst; 1129 } 1130 } 1131 1132 /* 1133 * Otherwise it will be difficult to maintain 1134 * sk->sk_dst_cache. 1135 */ 1136 if (sk->sk_state == TCP_ESTABLISHED && 1137 ipv6_addr_equal(daddr, &np->daddr)) 1138 daddr = &np->daddr; 1139 1140 if (addr_len >= sizeof(struct sockaddr_in6) && 1141 sin6->sin6_scope_id && 1142 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 1143 fl6.flowi6_oif = sin6->sin6_scope_id; 1144 } else { 1145 if (sk->sk_state != TCP_ESTABLISHED) 1146 return -EDESTADDRREQ; 1147 1148 fl6.fl6_dport = inet->inet_dport; 1149 daddr = &np->daddr; 1150 fl6.flowlabel = np->flow_label; 1151 connected = 1; 1152 } 1153 1154 if (!fl6.flowi6_oif) 1155 fl6.flowi6_oif = sk->sk_bound_dev_if; 1156 1157 if (!fl6.flowi6_oif) 1158 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1159 1160 fl6.flowi6_mark = sk->sk_mark; 1161 1162 if (msg->msg_controllen) { 1163 opt = &opt_space; 1164 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1165 opt->tot_len = sizeof(*opt); 1166 1167 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 1168 &hlimit, &tclass, &dontfrag); 1169 if (err < 0) { 1170 fl6_sock_release(flowlabel); 1171 return err; 1172 } 1173 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1174 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1175 if (flowlabel == NULL) 1176 return -EINVAL; 1177 } 1178 if (!(opt->opt_nflen|opt->opt_flen)) 1179 opt = NULL; 1180 connected = 0; 1181 } 1182 if (opt == NULL) 1183 opt = np->opt; 1184 if (flowlabel) 1185 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1186 opt = ipv6_fixup_options(&opt_space, opt); 1187 1188 fl6.flowi6_proto = sk->sk_protocol; 1189 if (!ipv6_addr_any(daddr)) 1190 fl6.daddr = *daddr; 1191 else 1192 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1193 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1194 fl6.saddr = np->saddr; 1195 fl6.fl6_sport = inet->inet_sport; 1196 1197 final_p = fl6_update_dst(&fl6, opt, &final); 1198 if (final_p) 1199 connected = 0; 1200 1201 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1202 fl6.flowi6_oif = np->mcast_oif; 1203 connected = 0; 1204 } else if (!fl6.flowi6_oif) 1205 fl6.flowi6_oif = np->ucast_oif; 1206 1207 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1208 1209 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); 1210 if (IS_ERR(dst)) { 1211 err = PTR_ERR(dst); 1212 dst = NULL; 1213 goto out; 1214 } 1215 1216 if (hlimit < 0) { 1217 if (ipv6_addr_is_multicast(&fl6.daddr)) 1218 hlimit = np->mcast_hops; 1219 else 1220 hlimit = np->hop_limit; 1221 if (hlimit < 0) 1222 hlimit = ip6_dst_hoplimit(dst); 1223 } 1224 1225 if (tclass < 0) 1226 tclass = np->tclass; 1227 1228 if (dontfrag < 0) 1229 dontfrag = np->dontfrag; 1230 1231 if (msg->msg_flags&MSG_CONFIRM) 1232 goto do_confirm; 1233 back_from_confirm: 1234 1235 lock_sock(sk); 1236 if (unlikely(up->pending)) { 1237 /* The socket is already corked while preparing it. */ 1238 /* ... which is an evident application bug. --ANK */ 1239 release_sock(sk); 1240 1241 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1242 err = -EINVAL; 1243 goto out; 1244 } 1245 1246 up->pending = AF_INET6; 1247 1248 do_append_data: 1249 up->len += ulen; 1250 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1251 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1252 sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1253 (struct rt6_info*)dst, 1254 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1255 if (err) 1256 udp_v6_flush_pending_frames(sk); 1257 else if (!corkreq) 1258 err = udp_v6_push_pending_frames(sk); 1259 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1260 up->pending = 0; 1261 1262 if (dst) { 1263 if (connected) { 1264 ip6_dst_store(sk, dst, 1265 ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 1266 &np->daddr : NULL, 1267 #ifdef CONFIG_IPV6_SUBTREES 1268 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1269 &np->saddr : 1270 #endif 1271 NULL); 1272 } else { 1273 dst_release(dst); 1274 } 1275 dst = NULL; 1276 } 1277 1278 if (err > 0) 1279 err = np->recverr ? net_xmit_errno(err) : 0; 1280 release_sock(sk); 1281 out: 1282 dst_release(dst); 1283 fl6_sock_release(flowlabel); 1284 if (!err) 1285 return len; 1286 /* 1287 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1288 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1289 * we don't have a good statistic (IpOutDiscards but it can be too many 1290 * things). We could add another new stat but at least for now that 1291 * seems like overkill. 1292 */ 1293 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1294 UDP6_INC_STATS_USER(sock_net(sk), 1295 UDP_MIB_SNDBUFERRORS, is_udplite); 1296 } 1297 return err; 1298 1299 do_confirm: 1300 dst_confirm(dst); 1301 if (!(msg->msg_flags&MSG_PROBE) || len) 1302 goto back_from_confirm; 1303 err = 0; 1304 goto out; 1305 } 1306 1307 void udpv6_destroy_sock(struct sock *sk) 1308 { 1309 struct udp_sock *up = udp_sk(sk); 1310 lock_sock(sk); 1311 udp_v6_flush_pending_frames(sk); 1312 release_sock(sk); 1313 1314 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1315 void (*encap_destroy)(struct sock *sk); 1316 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1317 if (encap_destroy) 1318 encap_destroy(sk); 1319 } 1320 1321 inet6_destroy_sock(sk); 1322 } 1323 1324 /* 1325 * Socket option code for UDP 1326 */ 1327 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1328 char __user *optval, unsigned int optlen) 1329 { 1330 if (level == SOL_UDP || level == SOL_UDPLITE) 1331 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1332 udp_v6_push_pending_frames); 1333 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1334 } 1335 1336 #ifdef CONFIG_COMPAT 1337 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1338 char __user *optval, unsigned int optlen) 1339 { 1340 if (level == SOL_UDP || level == SOL_UDPLITE) 1341 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1342 udp_v6_push_pending_frames); 1343 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1344 } 1345 #endif 1346 1347 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1348 char __user *optval, int __user *optlen) 1349 { 1350 if (level == SOL_UDP || level == SOL_UDPLITE) 1351 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1352 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1353 } 1354 1355 #ifdef CONFIG_COMPAT 1356 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1357 char __user *optval, int __user *optlen) 1358 { 1359 if (level == SOL_UDP || level == SOL_UDPLITE) 1360 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1361 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1362 } 1363 #endif 1364 1365 static const struct inet6_protocol udpv6_protocol = { 1366 .handler = udpv6_rcv, 1367 .err_handler = udpv6_err, 1368 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1369 }; 1370 1371 /* ------------------------------------------------------------------------ */ 1372 #ifdef CONFIG_PROC_FS 1373 int udp6_seq_show(struct seq_file *seq, void *v) 1374 { 1375 if (v == SEQ_START_TOKEN) { 1376 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1377 } else { 1378 int bucket = ((struct udp_iter_state *)seq->private)->bucket; 1379 struct inet_sock *inet = inet_sk(v); 1380 __u16 srcp = ntohs(inet->inet_sport); 1381 __u16 destp = ntohs(inet->inet_dport); 1382 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 1383 } 1384 return 0; 1385 } 1386 1387 static const struct file_operations udp6_afinfo_seq_fops = { 1388 .owner = THIS_MODULE, 1389 .open = udp_seq_open, 1390 .read = seq_read, 1391 .llseek = seq_lseek, 1392 .release = seq_release_net 1393 }; 1394 1395 static struct udp_seq_afinfo udp6_seq_afinfo = { 1396 .name = "udp6", 1397 .family = AF_INET6, 1398 .udp_table = &udp_table, 1399 .seq_fops = &udp6_afinfo_seq_fops, 1400 .seq_ops = { 1401 .show = udp6_seq_show, 1402 }, 1403 }; 1404 1405 int __net_init udp6_proc_init(struct net *net) 1406 { 1407 return udp_proc_register(net, &udp6_seq_afinfo); 1408 } 1409 1410 void udp6_proc_exit(struct net *net) { 1411 udp_proc_unregister(net, &udp6_seq_afinfo); 1412 } 1413 #endif /* CONFIG_PROC_FS */ 1414 1415 void udp_v6_clear_sk(struct sock *sk, int size) 1416 { 1417 struct inet_sock *inet = inet_sk(sk); 1418 1419 /* we do not want to clear pinet6 field, because of RCU lookups */ 1420 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); 1421 1422 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); 1423 memset(&inet->pinet6 + 1, 0, size); 1424 } 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 = udp_v6_clear_sk, 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