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_CSUMERRORS, is_udplite); 489 UDP_INC_STATS_USER(sock_net(sk), 490 UDP_MIB_INERRORS, is_udplite); 491 } else { 492 UDP6_INC_STATS_USER(sock_net(sk), 493 UDP_MIB_CSUMERRORS, is_udplite); 494 UDP6_INC_STATS_USER(sock_net(sk), 495 UDP_MIB_INERRORS, is_udplite); 496 } 497 } 498 unlock_sock_fast(sk, slow); 499 500 if (noblock) 501 return -EAGAIN; 502 503 /* starting over for a new packet */ 504 msg->msg_flags &= ~MSG_TRUNC; 505 goto try_again; 506 } 507 508 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 509 u8 type, u8 code, int offset, __be32 info, 510 struct udp_table *udptable) 511 { 512 struct ipv6_pinfo *np; 513 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 514 const struct in6_addr *saddr = &hdr->saddr; 515 const struct in6_addr *daddr = &hdr->daddr; 516 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 517 struct sock *sk; 518 int err; 519 520 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 521 saddr, uh->source, inet6_iif(skb), udptable); 522 if (sk == NULL) 523 return; 524 525 if (type == ICMPV6_PKT_TOOBIG) 526 ip6_sk_update_pmtu(skb, sk, info); 527 if (type == NDISC_REDIRECT) 528 ip6_sk_redirect(skb, sk); 529 530 np = inet6_sk(sk); 531 532 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 533 goto out; 534 535 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 536 goto out; 537 538 if (np->recverr) 539 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 540 541 sk->sk_err = err; 542 sk->sk_error_report(sk); 543 out: 544 sock_put(sk); 545 } 546 547 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 548 { 549 int rc; 550 551 if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) 552 sock_rps_save_rxhash(sk, skb); 553 554 rc = sock_queue_rcv_skb(sk, skb); 555 if (rc < 0) { 556 int is_udplite = IS_UDPLITE(sk); 557 558 /* Note that an ENOMEM error is charged twice */ 559 if (rc == -ENOMEM) 560 UDP6_INC_STATS_BH(sock_net(sk), 561 UDP_MIB_RCVBUFERRORS, is_udplite); 562 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 563 kfree_skb(skb); 564 return -1; 565 } 566 return 0; 567 } 568 569 static __inline__ void udpv6_err(struct sk_buff *skb, 570 struct inet6_skb_parm *opt, u8 type, 571 u8 code, int offset, __be32 info ) 572 { 573 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 574 } 575 576 static struct static_key udpv6_encap_needed __read_mostly; 577 void udpv6_encap_enable(void) 578 { 579 if (!static_key_enabled(&udpv6_encap_needed)) 580 static_key_slow_inc(&udpv6_encap_needed); 581 } 582 EXPORT_SYMBOL(udpv6_encap_enable); 583 584 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 585 { 586 struct udp_sock *up = udp_sk(sk); 587 int rc; 588 int is_udplite = IS_UDPLITE(sk); 589 590 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 591 goto drop; 592 593 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 594 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 595 596 /* 597 * This is an encapsulation socket so pass the skb to 598 * the socket's udp_encap_rcv() hook. Otherwise, just 599 * fall through and pass this up the UDP socket. 600 * up->encap_rcv() returns the following value: 601 * =0 if skb was successfully passed to the encap 602 * handler or was discarded by it. 603 * >0 if skb should be passed on to UDP. 604 * <0 if skb should be resubmitted as proto -N 605 */ 606 607 /* if we're overly short, let UDP handle it */ 608 encap_rcv = ACCESS_ONCE(up->encap_rcv); 609 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { 610 int ret; 611 612 ret = encap_rcv(sk, skb); 613 if (ret <= 0) { 614 UDP_INC_STATS_BH(sock_net(sk), 615 UDP_MIB_INDATAGRAMS, 616 is_udplite); 617 return -ret; 618 } 619 } 620 621 /* FALLTHROUGH -- it's a UDP Packet */ 622 } 623 624 /* 625 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 626 */ 627 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 628 629 if (up->pcrlen == 0) { /* full coverage was set */ 630 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 631 " %d while full coverage %d requested\n", 632 UDP_SKB_CB(skb)->cscov, skb->len); 633 goto drop; 634 } 635 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 636 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 637 "too small, need min %d\n", 638 UDP_SKB_CB(skb)->cscov, up->pcrlen); 639 goto drop; 640 } 641 } 642 643 if (rcu_access_pointer(sk->sk_filter)) { 644 if (udp_lib_checksum_complete(skb)) 645 goto csum_error; 646 } 647 648 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) 649 goto drop; 650 651 skb_dst_drop(skb); 652 653 bh_lock_sock(sk); 654 rc = 0; 655 if (!sock_owned_by_user(sk)) 656 rc = __udpv6_queue_rcv_skb(sk, skb); 657 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 658 bh_unlock_sock(sk); 659 goto drop; 660 } 661 bh_unlock_sock(sk); 662 663 return rc; 664 csum_error: 665 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); 666 drop: 667 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 668 atomic_inc(&sk->sk_drops); 669 kfree_skb(skb); 670 return -1; 671 } 672 673 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 674 __be16 loc_port, const struct in6_addr *loc_addr, 675 __be16 rmt_port, const struct in6_addr *rmt_addr, 676 int dif) 677 { 678 struct hlist_nulls_node *node; 679 struct sock *s = sk; 680 unsigned short num = ntohs(loc_port); 681 682 sk_nulls_for_each_from(s, node) { 683 struct inet_sock *inet = inet_sk(s); 684 685 if (!net_eq(sock_net(s), net)) 686 continue; 687 688 if (udp_sk(s)->udp_port_hash == num && 689 s->sk_family == PF_INET6) { 690 struct ipv6_pinfo *np = inet6_sk(s); 691 if (inet->inet_dport) { 692 if (inet->inet_dport != rmt_port) 693 continue; 694 } 695 if (!ipv6_addr_any(&np->daddr) && 696 !ipv6_addr_equal(&np->daddr, rmt_addr)) 697 continue; 698 699 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 700 continue; 701 702 if (!ipv6_addr_any(&np->rcv_saddr)) { 703 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 704 continue; 705 } 706 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 707 continue; 708 return s; 709 } 710 } 711 return NULL; 712 } 713 714 static void flush_stack(struct sock **stack, unsigned int count, 715 struct sk_buff *skb, unsigned int final) 716 { 717 struct sk_buff *skb1 = NULL; 718 struct sock *sk; 719 unsigned int i; 720 721 for (i = 0; i < count; i++) { 722 sk = stack[i]; 723 if (likely(skb1 == NULL)) 724 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 725 if (!skb1) { 726 atomic_inc(&sk->sk_drops); 727 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, 728 IS_UDPLITE(sk)); 729 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, 730 IS_UDPLITE(sk)); 731 } 732 733 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) 734 skb1 = NULL; 735 } 736 if (unlikely(skb1)) 737 kfree_skb(skb1); 738 } 739 /* 740 * Note: called only from the BH handler context, 741 * so we don't need to lock the hashes. 742 */ 743 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 744 const struct in6_addr *saddr, const struct in6_addr *daddr, 745 struct udp_table *udptable) 746 { 747 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 748 const struct udphdr *uh = udp_hdr(skb); 749 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 750 int dif; 751 unsigned int i, count = 0; 752 753 spin_lock(&hslot->lock); 754 sk = sk_nulls_head(&hslot->head); 755 dif = inet6_iif(skb); 756 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 757 while (sk) { 758 stack[count++] = sk; 759 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 760 uh->source, saddr, dif); 761 if (unlikely(count == ARRAY_SIZE(stack))) { 762 if (!sk) 763 break; 764 flush_stack(stack, count, skb, ~0); 765 count = 0; 766 } 767 } 768 /* 769 * before releasing the lock, we must take reference on sockets 770 */ 771 for (i = 0; i < count; i++) 772 sock_hold(stack[i]); 773 774 spin_unlock(&hslot->lock); 775 776 if (count) { 777 flush_stack(stack, count, skb, count - 1); 778 779 for (i = 0; i < count; i++) 780 sock_put(stack[i]); 781 } else { 782 kfree_skb(skb); 783 } 784 return 0; 785 } 786 787 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 788 int proto) 789 { 790 struct net *net = dev_net(skb->dev); 791 struct sock *sk; 792 struct udphdr *uh; 793 const struct in6_addr *saddr, *daddr; 794 u32 ulen = 0; 795 796 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 797 goto discard; 798 799 saddr = &ipv6_hdr(skb)->saddr; 800 daddr = &ipv6_hdr(skb)->daddr; 801 uh = udp_hdr(skb); 802 803 ulen = ntohs(uh->len); 804 if (ulen > skb->len) 805 goto short_packet; 806 807 if (proto == IPPROTO_UDP) { 808 /* UDP validates ulen. */ 809 810 /* Check for jumbo payload */ 811 if (ulen == 0) 812 ulen = skb->len; 813 814 if (ulen < sizeof(*uh)) 815 goto short_packet; 816 817 if (ulen < skb->len) { 818 if (pskb_trim_rcsum(skb, ulen)) 819 goto short_packet; 820 saddr = &ipv6_hdr(skb)->saddr; 821 daddr = &ipv6_hdr(skb)->daddr; 822 uh = udp_hdr(skb); 823 } 824 } 825 826 if (udp6_csum_init(skb, uh, proto)) 827 goto csum_error; 828 829 /* 830 * Multicast receive code 831 */ 832 if (ipv6_addr_is_multicast(daddr)) 833 return __udp6_lib_mcast_deliver(net, skb, 834 saddr, daddr, udptable); 835 836 /* Unicast */ 837 838 /* 839 * check socket cache ... must talk to Alan about his plans 840 * for sock caches... i'll skip this for now. 841 */ 842 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 843 if (sk != NULL) { 844 int ret = udpv6_queue_rcv_skb(sk, skb); 845 sock_put(sk); 846 847 /* a return value > 0 means to resubmit the input, but 848 * it wants the return to be -protocol, or 0 849 */ 850 if (ret > 0) 851 return -ret; 852 853 return 0; 854 } 855 856 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 857 goto discard; 858 859 if (udp_lib_checksum_complete(skb)) 860 goto csum_error; 861 862 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 863 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 864 865 kfree_skb(skb); 866 return 0; 867 868 short_packet: 869 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 870 proto == IPPROTO_UDPLITE ? "-Lite" : "", 871 saddr, 872 ntohs(uh->source), 873 ulen, 874 skb->len, 875 daddr, 876 ntohs(uh->dest)); 877 goto discard; 878 csum_error: 879 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); 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_needs_scope_id(__ipv6_addr_type(daddr))) 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 = ip6_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 struct udp_sock *up = udp_sk(sk); 1299 lock_sock(sk); 1300 udp_v6_flush_pending_frames(sk); 1301 release_sock(sk); 1302 1303 if (static_key_false(&udpv6_encap_needed) && up->encap_type) { 1304 void (*encap_destroy)(struct sock *sk); 1305 encap_destroy = ACCESS_ONCE(up->encap_destroy); 1306 if (encap_destroy) 1307 encap_destroy(sk); 1308 } 1309 1310 inet6_destroy_sock(sk); 1311 } 1312 1313 /* 1314 * Socket option code for UDP 1315 */ 1316 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1317 char __user *optval, unsigned int optlen) 1318 { 1319 if (level == SOL_UDP || level == SOL_UDPLITE) 1320 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1321 udp_v6_push_pending_frames); 1322 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1323 } 1324 1325 #ifdef CONFIG_COMPAT 1326 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1327 char __user *optval, unsigned int optlen) 1328 { 1329 if (level == SOL_UDP || level == SOL_UDPLITE) 1330 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1331 udp_v6_push_pending_frames); 1332 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1333 } 1334 #endif 1335 1336 int 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 ipv6_getsockopt(sk, level, optname, optval, optlen); 1342 } 1343 1344 #ifdef CONFIG_COMPAT 1345 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1346 char __user *optval, int __user *optlen) 1347 { 1348 if (level == SOL_UDP || level == SOL_UDPLITE) 1349 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1350 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1351 } 1352 #endif 1353 1354 static const struct inet6_protocol udpv6_protocol = { 1355 .handler = udpv6_rcv, 1356 .err_handler = udpv6_err, 1357 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1358 }; 1359 1360 /* ------------------------------------------------------------------------ */ 1361 #ifdef CONFIG_PROC_FS 1362 1363 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1364 { 1365 struct inet_sock *inet = inet_sk(sp); 1366 struct ipv6_pinfo *np = inet6_sk(sp); 1367 const struct in6_addr *dest, *src; 1368 __u16 destp, srcp; 1369 1370 dest = &np->daddr; 1371 src = &np->rcv_saddr; 1372 destp = ntohs(inet->inet_dport); 1373 srcp = ntohs(inet->inet_sport); 1374 seq_printf(seq, 1375 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1376 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1377 bucket, 1378 src->s6_addr32[0], src->s6_addr32[1], 1379 src->s6_addr32[2], src->s6_addr32[3], srcp, 1380 dest->s6_addr32[0], dest->s6_addr32[1], 1381 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1382 sp->sk_state, 1383 sk_wmem_alloc_get(sp), 1384 sk_rmem_alloc_get(sp), 1385 0, 0L, 0, 1386 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1387 0, 1388 sock_i_ino(sp), 1389 atomic_read(&sp->sk_refcnt), sp, 1390 atomic_read(&sp->sk_drops)); 1391 } 1392 1393 int udp6_seq_show(struct seq_file *seq, void *v) 1394 { 1395 if (v == SEQ_START_TOKEN) 1396 seq_printf(seq, 1397 " sl " 1398 "local_address " 1399 "remote_address " 1400 "st tx_queue rx_queue tr tm->when retrnsmt" 1401 " uid timeout inode ref pointer drops\n"); 1402 else 1403 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1404 return 0; 1405 } 1406 1407 static const struct file_operations udp6_afinfo_seq_fops = { 1408 .owner = THIS_MODULE, 1409 .open = udp_seq_open, 1410 .read = seq_read, 1411 .llseek = seq_lseek, 1412 .release = seq_release_net 1413 }; 1414 1415 static struct udp_seq_afinfo udp6_seq_afinfo = { 1416 .name = "udp6", 1417 .family = AF_INET6, 1418 .udp_table = &udp_table, 1419 .seq_fops = &udp6_afinfo_seq_fops, 1420 .seq_ops = { 1421 .show = udp6_seq_show, 1422 }, 1423 }; 1424 1425 int __net_init udp6_proc_init(struct net *net) 1426 { 1427 return udp_proc_register(net, &udp6_seq_afinfo); 1428 } 1429 1430 void udp6_proc_exit(struct net *net) { 1431 udp_proc_unregister(net, &udp6_seq_afinfo); 1432 } 1433 #endif /* CONFIG_PROC_FS */ 1434 1435 /* ------------------------------------------------------------------------ */ 1436 1437 struct proto udpv6_prot = { 1438 .name = "UDPv6", 1439 .owner = THIS_MODULE, 1440 .close = udp_lib_close, 1441 .connect = ip6_datagram_connect, 1442 .disconnect = udp_disconnect, 1443 .ioctl = udp_ioctl, 1444 .destroy = udpv6_destroy_sock, 1445 .setsockopt = udpv6_setsockopt, 1446 .getsockopt = udpv6_getsockopt, 1447 .sendmsg = udpv6_sendmsg, 1448 .recvmsg = udpv6_recvmsg, 1449 .backlog_rcv = __udpv6_queue_rcv_skb, 1450 .hash = udp_lib_hash, 1451 .unhash = udp_lib_unhash, 1452 .rehash = udp_v6_rehash, 1453 .get_port = udp_v6_get_port, 1454 .memory_allocated = &udp_memory_allocated, 1455 .sysctl_mem = sysctl_udp_mem, 1456 .sysctl_wmem = &sysctl_udp_wmem_min, 1457 .sysctl_rmem = &sysctl_udp_rmem_min, 1458 .obj_size = sizeof(struct udp6_sock), 1459 .slab_flags = SLAB_DESTROY_BY_RCU, 1460 .h.udp_table = &udp_table, 1461 #ifdef CONFIG_COMPAT 1462 .compat_setsockopt = compat_udpv6_setsockopt, 1463 .compat_getsockopt = compat_udpv6_getsockopt, 1464 #endif 1465 .clear_sk = sk_prot_clear_portaddr_nulls, 1466 }; 1467 1468 static struct inet_protosw udpv6_protosw = { 1469 .type = SOCK_DGRAM, 1470 .protocol = IPPROTO_UDP, 1471 .prot = &udpv6_prot, 1472 .ops = &inet6_dgram_ops, 1473 .no_check = UDP_CSUM_DEFAULT, 1474 .flags = INET_PROTOSW_PERMANENT, 1475 }; 1476 1477 1478 int __init udpv6_init(void) 1479 { 1480 int ret; 1481 1482 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1483 if (ret) 1484 goto out; 1485 1486 ret = inet6_register_protosw(&udpv6_protosw); 1487 if (ret) 1488 goto out_udpv6_protocol; 1489 out: 1490 return ret; 1491 1492 out_udpv6_protocol: 1493 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1494 goto out; 1495 } 1496 1497 void udpv6_exit(void) 1498 { 1499 inet6_unregister_protosw(&udpv6_protosw); 1500 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1501 } 1502