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 <asm/uaccess.h> 38 39 #include <net/ndisc.h> 40 #include <net/protocol.h> 41 #include <net/transp_v6.h> 42 #include <net/ip6_route.h> 43 #include <net/raw.h> 44 #include <net/tcp_states.h> 45 #include <net/ip6_checksum.h> 46 #include <net/xfrm.h> 47 48 #include <linux/proc_fs.h> 49 #include <linux/seq_file.h> 50 #include "udp_impl.h" 51 52 int udp_v6_get_port(struct sock *sk, unsigned short snum) 53 { 54 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal); 55 } 56 57 static inline int compute_score(struct sock *sk, struct net *net, 58 unsigned short hnum, 59 struct in6_addr *saddr, __be16 sport, 60 struct in6_addr *daddr, __be16 dport, 61 int dif) 62 { 63 int score = -1; 64 65 if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum && 66 sk->sk_family == PF_INET6) { 67 struct ipv6_pinfo *np = inet6_sk(sk); 68 struct inet_sock *inet = inet_sk(sk); 69 70 score = 0; 71 if (inet->dport) { 72 if (inet->dport != sport) 73 return -1; 74 score++; 75 } 76 if (!ipv6_addr_any(&np->rcv_saddr)) { 77 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 78 return -1; 79 score++; 80 } 81 if (!ipv6_addr_any(&np->daddr)) { 82 if (!ipv6_addr_equal(&np->daddr, saddr)) 83 return -1; 84 score++; 85 } 86 if (sk->sk_bound_dev_if) { 87 if (sk->sk_bound_dev_if != dif) 88 return -1; 89 score++; 90 } 91 } 92 return score; 93 } 94 95 static struct sock *__udp6_lib_lookup(struct net *net, 96 struct in6_addr *saddr, __be16 sport, 97 struct in6_addr *daddr, __be16 dport, 98 int dif, struct udp_table *udptable) 99 { 100 struct sock *sk, *result; 101 struct hlist_nulls_node *node; 102 unsigned short hnum = ntohs(dport); 103 unsigned int hash = udp_hashfn(net, hnum); 104 struct udp_hslot *hslot = &udptable->hash[hash]; 105 int score, badness; 106 107 rcu_read_lock(); 108 begin: 109 result = NULL; 110 badness = -1; 111 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 112 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 113 if (score > badness) { 114 result = sk; 115 badness = score; 116 } 117 } 118 /* 119 * if the nulls value we got at the end of this lookup is 120 * not the expected one, we must restart lookup. 121 * We probably met an item that was moved to another chain. 122 */ 123 if (get_nulls_value(node) != hash) 124 goto begin; 125 126 if (result) { 127 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) 128 result = NULL; 129 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 130 daddr, dport, dif) < badness)) { 131 sock_put(result); 132 goto begin; 133 } 134 } 135 rcu_read_unlock(); 136 return result; 137 } 138 139 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 140 __be16 sport, __be16 dport, 141 struct udp_table *udptable) 142 { 143 struct sock *sk; 144 struct ipv6hdr *iph = ipv6_hdr(skb); 145 146 if (unlikely(sk = skb_steal_sock(skb))) 147 return sk; 148 else 149 return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport, 150 &iph->daddr, dport, inet6_iif(skb), 151 udptable); 152 } 153 154 /* 155 * This should be easy, if there is something there we 156 * return it, otherwise we block. 157 */ 158 159 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 160 struct msghdr *msg, size_t len, 161 int noblock, int flags, int *addr_len) 162 { 163 struct ipv6_pinfo *np = inet6_sk(sk); 164 struct inet_sock *inet = inet_sk(sk); 165 struct sk_buff *skb; 166 unsigned int ulen, copied; 167 int peeked; 168 int err; 169 int is_udplite = IS_UDPLITE(sk); 170 int is_udp4; 171 172 if (addr_len) 173 *addr_len=sizeof(struct sockaddr_in6); 174 175 if (flags & MSG_ERRQUEUE) 176 return ipv6_recv_error(sk, msg, len); 177 178 try_again: 179 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 180 &peeked, &err); 181 if (!skb) 182 goto out; 183 184 ulen = skb->len - sizeof(struct udphdr); 185 copied = len; 186 if (copied > ulen) 187 copied = ulen; 188 else if (copied < ulen) 189 msg->msg_flags |= MSG_TRUNC; 190 191 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 192 193 /* 194 * If checksum is needed at all, try to do it while copying the 195 * data. If the data is truncated, or if we only want a partial 196 * coverage checksum (UDP-Lite), do it before the copy. 197 */ 198 199 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 200 if (udp_lib_checksum_complete(skb)) 201 goto csum_copy_err; 202 } 203 204 if (skb_csum_unnecessary(skb)) 205 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 206 msg->msg_iov, copied ); 207 else { 208 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 209 if (err == -EINVAL) 210 goto csum_copy_err; 211 } 212 if (err) 213 goto out_free; 214 215 if (!peeked) { 216 if (is_udp4) 217 UDP_INC_STATS_USER(sock_net(sk), 218 UDP_MIB_INDATAGRAMS, is_udplite); 219 else 220 UDP6_INC_STATS_USER(sock_net(sk), 221 UDP_MIB_INDATAGRAMS, is_udplite); 222 } 223 224 sock_recv_timestamp(msg, sk, skb); 225 226 /* Copy the address. */ 227 if (msg->msg_name) { 228 struct sockaddr_in6 *sin6; 229 230 sin6 = (struct sockaddr_in6 *) msg->msg_name; 231 sin6->sin6_family = AF_INET6; 232 sin6->sin6_port = udp_hdr(skb)->source; 233 sin6->sin6_flowinfo = 0; 234 sin6->sin6_scope_id = 0; 235 236 if (is_udp4) 237 ipv6_addr_set(&sin6->sin6_addr, 0, 0, 238 htonl(0xffff), ip_hdr(skb)->saddr); 239 else { 240 ipv6_addr_copy(&sin6->sin6_addr, 241 &ipv6_hdr(skb)->saddr); 242 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 243 sin6->sin6_scope_id = IP6CB(skb)->iif; 244 } 245 246 } 247 if (is_udp4) { 248 if (inet->cmsg_flags) 249 ip_cmsg_recv(msg, skb); 250 } else { 251 if (np->rxopt.all) 252 datagram_recv_ctl(sk, msg, skb); 253 } 254 255 err = copied; 256 if (flags & MSG_TRUNC) 257 err = ulen; 258 259 out_free: 260 lock_sock(sk); 261 skb_free_datagram(sk, skb); 262 release_sock(sk); 263 out: 264 return err; 265 266 csum_copy_err: 267 lock_sock(sk); 268 if (!skb_kill_datagram(sk, skb, flags)) { 269 if (is_udp4) 270 UDP_INC_STATS_USER(sock_net(sk), 271 UDP_MIB_INERRORS, is_udplite); 272 else 273 UDP6_INC_STATS_USER(sock_net(sk), 274 UDP_MIB_INERRORS, is_udplite); 275 } 276 release_sock(sk); 277 278 if (flags & MSG_DONTWAIT) 279 return -EAGAIN; 280 goto try_again; 281 } 282 283 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 284 int type, int code, int offset, __be32 info, 285 struct udp_table *udptable) 286 { 287 struct ipv6_pinfo *np; 288 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 289 struct in6_addr *saddr = &hdr->saddr; 290 struct in6_addr *daddr = &hdr->daddr; 291 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 292 struct sock *sk; 293 int err; 294 295 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 296 saddr, uh->source, inet6_iif(skb), udptable); 297 if (sk == NULL) 298 return; 299 300 np = inet6_sk(sk); 301 302 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 303 goto out; 304 305 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 306 goto out; 307 308 if (np->recverr) 309 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 310 311 sk->sk_err = err; 312 sk->sk_error_report(sk); 313 out: 314 sock_put(sk); 315 } 316 317 static __inline__ void udpv6_err(struct sk_buff *skb, 318 struct inet6_skb_parm *opt, int type, 319 int code, int offset, __be32 info ) 320 { 321 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 322 } 323 324 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 325 { 326 struct udp_sock *up = udp_sk(sk); 327 int rc; 328 int is_udplite = IS_UDPLITE(sk); 329 330 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 331 goto drop; 332 333 /* 334 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 335 */ 336 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 337 338 if (up->pcrlen == 0) { /* full coverage was set */ 339 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 340 " %d while full coverage %d requested\n", 341 UDP_SKB_CB(skb)->cscov, skb->len); 342 goto drop; 343 } 344 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 345 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 346 "too small, need min %d\n", 347 UDP_SKB_CB(skb)->cscov, up->pcrlen); 348 goto drop; 349 } 350 } 351 352 if (sk->sk_filter) { 353 if (udp_lib_checksum_complete(skb)) 354 goto drop; 355 } 356 357 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 358 /* Note that an ENOMEM error is charged twice */ 359 if (rc == -ENOMEM) { 360 UDP6_INC_STATS_BH(sock_net(sk), 361 UDP_MIB_RCVBUFERRORS, is_udplite); 362 atomic_inc(&sk->sk_drops); 363 } 364 goto drop; 365 } 366 367 return 0; 368 drop: 369 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 370 kfree_skb(skb); 371 return -1; 372 } 373 374 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 375 __be16 loc_port, struct in6_addr *loc_addr, 376 __be16 rmt_port, struct in6_addr *rmt_addr, 377 int dif) 378 { 379 struct hlist_nulls_node *node; 380 struct sock *s = sk; 381 unsigned short num = ntohs(loc_port); 382 383 sk_nulls_for_each_from(s, node) { 384 struct inet_sock *inet = inet_sk(s); 385 386 if (!net_eq(sock_net(s), net)) 387 continue; 388 389 if (s->sk_hash == num && s->sk_family == PF_INET6) { 390 struct ipv6_pinfo *np = inet6_sk(s); 391 if (inet->dport) { 392 if (inet->dport != rmt_port) 393 continue; 394 } 395 if (!ipv6_addr_any(&np->daddr) && 396 !ipv6_addr_equal(&np->daddr, rmt_addr)) 397 continue; 398 399 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 400 continue; 401 402 if (!ipv6_addr_any(&np->rcv_saddr)) { 403 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 404 continue; 405 } 406 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 407 continue; 408 return s; 409 } 410 } 411 return NULL; 412 } 413 414 /* 415 * Note: called only from the BH handler context, 416 * so we don't need to lock the hashes. 417 */ 418 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 419 struct in6_addr *saddr, struct in6_addr *daddr, 420 struct udp_table *udptable) 421 { 422 struct sock *sk, *sk2; 423 const struct udphdr *uh = udp_hdr(skb); 424 struct udp_hslot *hslot = &udptable->hash[udp_hashfn(net, ntohs(uh->dest))]; 425 int dif; 426 427 spin_lock(&hslot->lock); 428 sk = sk_nulls_head(&hslot->head); 429 dif = inet6_iif(skb); 430 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 431 if (!sk) { 432 kfree_skb(skb); 433 goto out; 434 } 435 436 sk2 = sk; 437 while ((sk2 = udp_v6_mcast_next(net, sk_nulls_next(sk2), uh->dest, daddr, 438 uh->source, saddr, dif))) { 439 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 440 if (buff) { 441 bh_lock_sock(sk2); 442 if (!sock_owned_by_user(sk2)) 443 udpv6_queue_rcv_skb(sk2, buff); 444 else 445 sk_add_backlog(sk2, buff); 446 bh_unlock_sock(sk2); 447 } 448 } 449 bh_lock_sock(sk); 450 if (!sock_owned_by_user(sk)) 451 udpv6_queue_rcv_skb(sk, skb); 452 else 453 sk_add_backlog(sk, skb); 454 bh_unlock_sock(sk); 455 out: 456 spin_unlock(&hslot->lock); 457 return 0; 458 } 459 460 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 461 int proto) 462 { 463 int err; 464 465 UDP_SKB_CB(skb)->partial_cov = 0; 466 UDP_SKB_CB(skb)->cscov = skb->len; 467 468 if (proto == IPPROTO_UDPLITE) { 469 err = udplite_checksum_init(skb, uh); 470 if (err) 471 return err; 472 } 473 474 if (uh->check == 0) { 475 /* RFC 2460 section 8.1 says that we SHOULD log 476 this error. Well, it is reasonable. 477 */ 478 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 479 return 1; 480 } 481 if (skb->ip_summed == CHECKSUM_COMPLETE && 482 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 483 skb->len, proto, skb->csum)) 484 skb->ip_summed = CHECKSUM_UNNECESSARY; 485 486 if (!skb_csum_unnecessary(skb)) 487 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 488 &ipv6_hdr(skb)->daddr, 489 skb->len, proto, 0)); 490 491 return 0; 492 } 493 494 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 495 int proto) 496 { 497 struct sock *sk; 498 struct udphdr *uh; 499 struct net_device *dev = skb->dev; 500 struct in6_addr *saddr, *daddr; 501 u32 ulen = 0; 502 struct net *net = dev_net(skb->dev); 503 504 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 505 goto short_packet; 506 507 saddr = &ipv6_hdr(skb)->saddr; 508 daddr = &ipv6_hdr(skb)->daddr; 509 uh = udp_hdr(skb); 510 511 ulen = ntohs(uh->len); 512 if (ulen > skb->len) 513 goto short_packet; 514 515 if (proto == IPPROTO_UDP) { 516 /* UDP validates ulen. */ 517 518 /* Check for jumbo payload */ 519 if (ulen == 0) 520 ulen = skb->len; 521 522 if (ulen < sizeof(*uh)) 523 goto short_packet; 524 525 if (ulen < skb->len) { 526 if (pskb_trim_rcsum(skb, ulen)) 527 goto short_packet; 528 saddr = &ipv6_hdr(skb)->saddr; 529 daddr = &ipv6_hdr(skb)->daddr; 530 uh = udp_hdr(skb); 531 } 532 } 533 534 if (udp6_csum_init(skb, uh, proto)) 535 goto discard; 536 537 /* 538 * Multicast receive code 539 */ 540 if (ipv6_addr_is_multicast(daddr)) 541 return __udp6_lib_mcast_deliver(net, skb, 542 saddr, daddr, udptable); 543 544 /* Unicast */ 545 546 /* 547 * check socket cache ... must talk to Alan about his plans 548 * for sock caches... i'll skip this for now. 549 */ 550 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 551 552 if (sk == NULL) { 553 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 554 goto discard; 555 556 if (udp_lib_checksum_complete(skb)) 557 goto discard; 558 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, 559 proto == IPPROTO_UDPLITE); 560 561 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 562 563 kfree_skb(skb); 564 return 0; 565 } 566 567 /* deliver */ 568 569 bh_lock_sock(sk); 570 if (!sock_owned_by_user(sk)) 571 udpv6_queue_rcv_skb(sk, skb); 572 else 573 sk_add_backlog(sk, skb); 574 bh_unlock_sock(sk); 575 sock_put(sk); 576 return 0; 577 578 short_packet: 579 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 580 proto == IPPROTO_UDPLITE ? "-Lite" : "", 581 ulen, skb->len); 582 583 discard: 584 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 585 kfree_skb(skb); 586 return 0; 587 } 588 589 static __inline__ int udpv6_rcv(struct sk_buff *skb) 590 { 591 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 592 } 593 594 /* 595 * Throw away all pending data and cancel the corking. Socket is locked. 596 */ 597 static void udp_v6_flush_pending_frames(struct sock *sk) 598 { 599 struct udp_sock *up = udp_sk(sk); 600 601 if (up->pending == AF_INET) 602 udp_flush_pending_frames(sk); 603 else if (up->pending) { 604 up->len = 0; 605 up->pending = 0; 606 ip6_flush_pending_frames(sk); 607 } 608 } 609 610 /* 611 * Sending 612 */ 613 614 static int udp_v6_push_pending_frames(struct sock *sk) 615 { 616 struct sk_buff *skb; 617 struct udphdr *uh; 618 struct udp_sock *up = udp_sk(sk); 619 struct inet_sock *inet = inet_sk(sk); 620 struct flowi *fl = &inet->cork.fl; 621 int err = 0; 622 int is_udplite = IS_UDPLITE(sk); 623 __wsum csum = 0; 624 625 /* Grab the skbuff where UDP header space exists. */ 626 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 627 goto out; 628 629 /* 630 * Create a UDP header 631 */ 632 uh = udp_hdr(skb); 633 uh->source = fl->fl_ip_sport; 634 uh->dest = fl->fl_ip_dport; 635 uh->len = htons(up->len); 636 uh->check = 0; 637 638 if (is_udplite) 639 csum = udplite_csum_outgoing(sk, skb); 640 else 641 csum = udp_csum_outgoing(sk, skb); 642 643 /* add protocol-dependent pseudo-header */ 644 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 645 up->len, fl->proto, csum ); 646 if (uh->check == 0) 647 uh->check = CSUM_MANGLED_0; 648 649 err = ip6_push_pending_frames(sk); 650 out: 651 up->len = 0; 652 up->pending = 0; 653 if (!err) 654 UDP6_INC_STATS_USER(sock_net(sk), 655 UDP_MIB_OUTDATAGRAMS, is_udplite); 656 return err; 657 } 658 659 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 660 struct msghdr *msg, size_t len) 661 { 662 struct ipv6_txoptions opt_space; 663 struct udp_sock *up = udp_sk(sk); 664 struct inet_sock *inet = inet_sk(sk); 665 struct ipv6_pinfo *np = inet6_sk(sk); 666 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 667 struct in6_addr *daddr, *final_p = NULL, final; 668 struct ipv6_txoptions *opt = NULL; 669 struct ip6_flowlabel *flowlabel = NULL; 670 struct flowi fl; 671 struct dst_entry *dst; 672 int addr_len = msg->msg_namelen; 673 int ulen = len; 674 int hlimit = -1; 675 int tclass = -1; 676 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 677 int err; 678 int connected = 0; 679 int is_udplite = IS_UDPLITE(sk); 680 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 681 682 /* destination address check */ 683 if (sin6) { 684 if (addr_len < offsetof(struct sockaddr, sa_data)) 685 return -EINVAL; 686 687 switch (sin6->sin6_family) { 688 case AF_INET6: 689 if (addr_len < SIN6_LEN_RFC2133) 690 return -EINVAL; 691 daddr = &sin6->sin6_addr; 692 break; 693 case AF_INET: 694 goto do_udp_sendmsg; 695 case AF_UNSPEC: 696 msg->msg_name = sin6 = NULL; 697 msg->msg_namelen = addr_len = 0; 698 daddr = NULL; 699 break; 700 default: 701 return -EINVAL; 702 } 703 } else if (!up->pending) { 704 if (sk->sk_state != TCP_ESTABLISHED) 705 return -EDESTADDRREQ; 706 daddr = &np->daddr; 707 } else 708 daddr = NULL; 709 710 if (daddr) { 711 if (ipv6_addr_v4mapped(daddr)) { 712 struct sockaddr_in sin; 713 sin.sin_family = AF_INET; 714 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 715 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 716 msg->msg_name = &sin; 717 msg->msg_namelen = sizeof(sin); 718 do_udp_sendmsg: 719 if (__ipv6_only_sock(sk)) 720 return -ENETUNREACH; 721 return udp_sendmsg(iocb, sk, msg, len); 722 } 723 } 724 725 if (up->pending == AF_INET) 726 return udp_sendmsg(iocb, sk, msg, len); 727 728 /* Rough check on arithmetic overflow, 729 better check is made in ip6_append_data(). 730 */ 731 if (len > INT_MAX - sizeof(struct udphdr)) 732 return -EMSGSIZE; 733 734 if (up->pending) { 735 /* 736 * There are pending frames. 737 * The socket lock must be held while it's corked. 738 */ 739 lock_sock(sk); 740 if (likely(up->pending)) { 741 if (unlikely(up->pending != AF_INET6)) { 742 release_sock(sk); 743 return -EAFNOSUPPORT; 744 } 745 dst = NULL; 746 goto do_append_data; 747 } 748 release_sock(sk); 749 } 750 ulen += sizeof(struct udphdr); 751 752 memset(&fl, 0, sizeof(fl)); 753 754 if (sin6) { 755 if (sin6->sin6_port == 0) 756 return -EINVAL; 757 758 fl.fl_ip_dport = sin6->sin6_port; 759 daddr = &sin6->sin6_addr; 760 761 if (np->sndflow) { 762 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 763 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 764 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 765 if (flowlabel == NULL) 766 return -EINVAL; 767 daddr = &flowlabel->dst; 768 } 769 } 770 771 /* 772 * Otherwise it will be difficult to maintain 773 * sk->sk_dst_cache. 774 */ 775 if (sk->sk_state == TCP_ESTABLISHED && 776 ipv6_addr_equal(daddr, &np->daddr)) 777 daddr = &np->daddr; 778 779 if (addr_len >= sizeof(struct sockaddr_in6) && 780 sin6->sin6_scope_id && 781 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 782 fl.oif = sin6->sin6_scope_id; 783 } else { 784 if (sk->sk_state != TCP_ESTABLISHED) 785 return -EDESTADDRREQ; 786 787 fl.fl_ip_dport = inet->dport; 788 daddr = &np->daddr; 789 fl.fl6_flowlabel = np->flow_label; 790 connected = 1; 791 } 792 793 if (!fl.oif) 794 fl.oif = sk->sk_bound_dev_if; 795 796 if (!fl.oif) 797 fl.oif = np->sticky_pktinfo.ipi6_ifindex; 798 799 if (msg->msg_controllen) { 800 opt = &opt_space; 801 memset(opt, 0, sizeof(struct ipv6_txoptions)); 802 opt->tot_len = sizeof(*opt); 803 804 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); 805 if (err < 0) { 806 fl6_sock_release(flowlabel); 807 return err; 808 } 809 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 810 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 811 if (flowlabel == NULL) 812 return -EINVAL; 813 } 814 if (!(opt->opt_nflen|opt->opt_flen)) 815 opt = NULL; 816 connected = 0; 817 } 818 if (opt == NULL) 819 opt = np->opt; 820 if (flowlabel) 821 opt = fl6_merge_options(&opt_space, flowlabel, opt); 822 opt = ipv6_fixup_options(&opt_space, opt); 823 824 fl.proto = sk->sk_protocol; 825 if (!ipv6_addr_any(daddr)) 826 ipv6_addr_copy(&fl.fl6_dst, daddr); 827 else 828 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 829 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 830 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 831 fl.fl_ip_sport = inet->sport; 832 833 /* merge ip6_build_xmit from ip6_output */ 834 if (opt && opt->srcrt) { 835 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 836 ipv6_addr_copy(&final, &fl.fl6_dst); 837 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 838 final_p = &final; 839 connected = 0; 840 } 841 842 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 843 fl.oif = np->mcast_oif; 844 connected = 0; 845 } 846 847 security_sk_classify_flow(sk, &fl); 848 849 err = ip6_sk_dst_lookup(sk, &dst, &fl); 850 if (err) 851 goto out; 852 if (final_p) 853 ipv6_addr_copy(&fl.fl6_dst, final_p); 854 855 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 856 if (err < 0) { 857 if (err == -EREMOTE) 858 err = ip6_dst_blackhole(sk, &dst, &fl); 859 if (err < 0) 860 goto out; 861 } 862 863 if (hlimit < 0) { 864 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 865 hlimit = np->mcast_hops; 866 else 867 hlimit = np->hop_limit; 868 if (hlimit < 0) 869 hlimit = ip6_dst_hoplimit(dst); 870 } 871 872 if (tclass < 0) { 873 tclass = np->tclass; 874 if (tclass < 0) 875 tclass = 0; 876 } 877 878 if (msg->msg_flags&MSG_CONFIRM) 879 goto do_confirm; 880 back_from_confirm: 881 882 lock_sock(sk); 883 if (unlikely(up->pending)) { 884 /* The socket is already corked while preparing it. */ 885 /* ... which is an evident application bug. --ANK */ 886 release_sock(sk); 887 888 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 889 err = -EINVAL; 890 goto out; 891 } 892 893 up->pending = AF_INET6; 894 895 do_append_data: 896 up->len += ulen; 897 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 898 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 899 sizeof(struct udphdr), hlimit, tclass, opt, &fl, 900 (struct rt6_info*)dst, 901 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 902 if (err) 903 udp_v6_flush_pending_frames(sk); 904 else if (!corkreq) 905 err = udp_v6_push_pending_frames(sk); 906 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 907 up->pending = 0; 908 909 if (dst) { 910 if (connected) { 911 ip6_dst_store(sk, dst, 912 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 913 &np->daddr : NULL, 914 #ifdef CONFIG_IPV6_SUBTREES 915 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 916 &np->saddr : 917 #endif 918 NULL); 919 } else { 920 dst_release(dst); 921 } 922 dst = NULL; 923 } 924 925 if (err > 0) 926 err = np->recverr ? net_xmit_errno(err) : 0; 927 release_sock(sk); 928 out: 929 dst_release(dst); 930 fl6_sock_release(flowlabel); 931 if (!err) 932 return len; 933 /* 934 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 935 * ENOBUFS might not be good (it's not tunable per se), but otherwise 936 * we don't have a good statistic (IpOutDiscards but it can be too many 937 * things). We could add another new stat but at least for now that 938 * seems like overkill. 939 */ 940 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 941 UDP6_INC_STATS_USER(sock_net(sk), 942 UDP_MIB_SNDBUFERRORS, is_udplite); 943 } 944 return err; 945 946 do_confirm: 947 dst_confirm(dst); 948 if (!(msg->msg_flags&MSG_PROBE) || len) 949 goto back_from_confirm; 950 err = 0; 951 goto out; 952 } 953 954 void udpv6_destroy_sock(struct sock *sk) 955 { 956 lock_sock(sk); 957 udp_v6_flush_pending_frames(sk); 958 release_sock(sk); 959 960 inet6_destroy_sock(sk); 961 } 962 963 /* 964 * Socket option code for UDP 965 */ 966 int udpv6_setsockopt(struct sock *sk, int level, int optname, 967 char __user *optval, int optlen) 968 { 969 if (level == SOL_UDP || level == SOL_UDPLITE) 970 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 971 udp_v6_push_pending_frames); 972 return ipv6_setsockopt(sk, level, optname, optval, optlen); 973 } 974 975 #ifdef CONFIG_COMPAT 976 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 977 char __user *optval, int optlen) 978 { 979 if (level == SOL_UDP || level == SOL_UDPLITE) 980 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 981 udp_v6_push_pending_frames); 982 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 983 } 984 #endif 985 986 int udpv6_getsockopt(struct sock *sk, int level, int optname, 987 char __user *optval, int __user *optlen) 988 { 989 if (level == SOL_UDP || level == SOL_UDPLITE) 990 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 991 return ipv6_getsockopt(sk, level, optname, optval, optlen); 992 } 993 994 #ifdef CONFIG_COMPAT 995 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 996 char __user *optval, int __user *optlen) 997 { 998 if (level == SOL_UDP || level == SOL_UDPLITE) 999 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1000 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1001 } 1002 #endif 1003 1004 static struct inet6_protocol udpv6_protocol = { 1005 .handler = udpv6_rcv, 1006 .err_handler = udpv6_err, 1007 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1008 }; 1009 1010 /* ------------------------------------------------------------------------ */ 1011 #ifdef CONFIG_PROC_FS 1012 1013 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1014 { 1015 struct inet_sock *inet = inet_sk(sp); 1016 struct ipv6_pinfo *np = inet6_sk(sp); 1017 struct in6_addr *dest, *src; 1018 __u16 destp, srcp; 1019 1020 dest = &np->daddr; 1021 src = &np->rcv_saddr; 1022 destp = ntohs(inet->dport); 1023 srcp = ntohs(inet->sport); 1024 seq_printf(seq, 1025 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1026 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1027 bucket, 1028 src->s6_addr32[0], src->s6_addr32[1], 1029 src->s6_addr32[2], src->s6_addr32[3], srcp, 1030 dest->s6_addr32[0], dest->s6_addr32[1], 1031 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1032 sp->sk_state, 1033 atomic_read(&sp->sk_wmem_alloc), 1034 atomic_read(&sp->sk_rmem_alloc), 1035 0, 0L, 0, 1036 sock_i_uid(sp), 0, 1037 sock_i_ino(sp), 1038 atomic_read(&sp->sk_refcnt), sp, 1039 atomic_read(&sp->sk_drops)); 1040 } 1041 1042 int udp6_seq_show(struct seq_file *seq, void *v) 1043 { 1044 if (v == SEQ_START_TOKEN) 1045 seq_printf(seq, 1046 " sl " 1047 "local_address " 1048 "remote_address " 1049 "st tx_queue rx_queue tr tm->when retrnsmt" 1050 " uid timeout inode ref pointer drops\n"); 1051 else 1052 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1053 return 0; 1054 } 1055 1056 static struct udp_seq_afinfo udp6_seq_afinfo = { 1057 .name = "udp6", 1058 .family = AF_INET6, 1059 .udp_table = &udp_table, 1060 .seq_fops = { 1061 .owner = THIS_MODULE, 1062 }, 1063 .seq_ops = { 1064 .show = udp6_seq_show, 1065 }, 1066 }; 1067 1068 int udp6_proc_init(struct net *net) 1069 { 1070 return udp_proc_register(net, &udp6_seq_afinfo); 1071 } 1072 1073 void udp6_proc_exit(struct net *net) { 1074 udp_proc_unregister(net, &udp6_seq_afinfo); 1075 } 1076 #endif /* CONFIG_PROC_FS */ 1077 1078 /* ------------------------------------------------------------------------ */ 1079 1080 struct proto udpv6_prot = { 1081 .name = "UDPv6", 1082 .owner = THIS_MODULE, 1083 .close = udp_lib_close, 1084 .connect = ip6_datagram_connect, 1085 .disconnect = udp_disconnect, 1086 .ioctl = udp_ioctl, 1087 .destroy = udpv6_destroy_sock, 1088 .setsockopt = udpv6_setsockopt, 1089 .getsockopt = udpv6_getsockopt, 1090 .sendmsg = udpv6_sendmsg, 1091 .recvmsg = udpv6_recvmsg, 1092 .backlog_rcv = udpv6_queue_rcv_skb, 1093 .hash = udp_lib_hash, 1094 .unhash = udp_lib_unhash, 1095 .get_port = udp_v6_get_port, 1096 .memory_allocated = &udp_memory_allocated, 1097 .sysctl_mem = sysctl_udp_mem, 1098 .sysctl_wmem = &sysctl_udp_wmem_min, 1099 .sysctl_rmem = &sysctl_udp_rmem_min, 1100 .obj_size = sizeof(struct udp6_sock), 1101 .slab_flags = SLAB_DESTROY_BY_RCU, 1102 .h.udp_table = &udp_table, 1103 #ifdef CONFIG_COMPAT 1104 .compat_setsockopt = compat_udpv6_setsockopt, 1105 .compat_getsockopt = compat_udpv6_getsockopt, 1106 #endif 1107 }; 1108 1109 static struct inet_protosw udpv6_protosw = { 1110 .type = SOCK_DGRAM, 1111 .protocol = IPPROTO_UDP, 1112 .prot = &udpv6_prot, 1113 .ops = &inet6_dgram_ops, 1114 .capability =-1, 1115 .no_check = UDP_CSUM_DEFAULT, 1116 .flags = INET_PROTOSW_PERMANENT, 1117 }; 1118 1119 1120 int __init udpv6_init(void) 1121 { 1122 int ret; 1123 1124 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1125 if (ret) 1126 goto out; 1127 1128 ret = inet6_register_protosw(&udpv6_protosw); 1129 if (ret) 1130 goto out_udpv6_protocol; 1131 out: 1132 return ret; 1133 1134 out_udpv6_protocol: 1135 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1136 goto out; 1137 } 1138 1139 void udpv6_exit(void) 1140 { 1141 inet6_unregister_protosw(&udpv6_protosw); 1142 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1143 } 1144