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