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 * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $ 11 * 12 * Fixes: 13 * Hideaki YOSHIFUJI : sin6_scope_id support 14 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 15 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 16 * a single port at the same time. 17 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 19 * 20 * This program is free software; you can redistribute it and/or 21 * modify it under the terms of the GNU General Public License 22 * as published by the Free Software Foundation; either version 23 * 2 of the License, or (at your option) any later version. 24 */ 25 26 #include <linux/config.h> 27 #include <linux/errno.h> 28 #include <linux/types.h> 29 #include <linux/socket.h> 30 #include <linux/sockios.h> 31 #include <linux/sched.h> 32 #include <linux/net.h> 33 #include <linux/in6.h> 34 #include <linux/netdevice.h> 35 #include <linux/if_arp.h> 36 #include <linux/ipv6.h> 37 #include <linux/icmpv6.h> 38 #include <linux/init.h> 39 #include <linux/skbuff.h> 40 #include <asm/uaccess.h> 41 42 #include <net/sock.h> 43 #include <net/snmp.h> 44 45 #include <net/ipv6.h> 46 #include <net/ndisc.h> 47 #include <net/protocol.h> 48 #include <net/transp_v6.h> 49 #include <net/ip6_route.h> 50 #include <net/addrconf.h> 51 #include <net/ip.h> 52 #include <net/udp.h> 53 #include <net/raw.h> 54 #include <net/inet_common.h> 55 #include <net/tcp_states.h> 56 57 #include <net/ip6_checksum.h> 58 #include <net/xfrm.h> 59 60 #include <linux/proc_fs.h> 61 #include <linux/seq_file.h> 62 63 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly; 64 65 /* Grrr, addr_type already calculated by caller, but I don't want 66 * to add some silly "cookie" argument to this method just for that. 67 */ 68 static int udp_v6_get_port(struct sock *sk, unsigned short snum) 69 { 70 struct sock *sk2; 71 struct hlist_node *node; 72 73 write_lock_bh(&udp_hash_lock); 74 if (snum == 0) { 75 int best_size_so_far, best, result, i; 76 77 if (udp_port_rover > sysctl_local_port_range[1] || 78 udp_port_rover < sysctl_local_port_range[0]) 79 udp_port_rover = sysctl_local_port_range[0]; 80 best_size_so_far = 32767; 81 best = result = udp_port_rover; 82 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) { 83 int size; 84 struct hlist_head *list; 85 86 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)]; 87 if (hlist_empty(list)) { 88 if (result > sysctl_local_port_range[1]) 89 result = sysctl_local_port_range[0] + 90 ((result - sysctl_local_port_range[0]) & 91 (UDP_HTABLE_SIZE - 1)); 92 goto gotit; 93 } 94 size = 0; 95 sk_for_each(sk2, node, list) 96 if (++size >= best_size_so_far) 97 goto next; 98 best_size_so_far = size; 99 best = result; 100 next:; 101 } 102 result = best; 103 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) { 104 if (result > sysctl_local_port_range[1]) 105 result = sysctl_local_port_range[0] 106 + ((result - sysctl_local_port_range[0]) & 107 (UDP_HTABLE_SIZE - 1)); 108 if (!udp_lport_inuse(result)) 109 break; 110 } 111 if (i >= (1 << 16) / UDP_HTABLE_SIZE) 112 goto fail; 113 gotit: 114 udp_port_rover = snum = result; 115 } else { 116 sk_for_each(sk2, node, 117 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) { 118 if (inet_sk(sk2)->num == snum && 119 sk2 != sk && 120 (!sk2->sk_bound_dev_if || 121 !sk->sk_bound_dev_if || 122 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && 123 (!sk2->sk_reuse || !sk->sk_reuse) && 124 ipv6_rcv_saddr_equal(sk, sk2)) 125 goto fail; 126 } 127 } 128 129 inet_sk(sk)->num = snum; 130 if (sk_unhashed(sk)) { 131 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]); 132 sock_prot_inc_use(sk->sk_prot); 133 } 134 write_unlock_bh(&udp_hash_lock); 135 return 0; 136 137 fail: 138 write_unlock_bh(&udp_hash_lock); 139 return 1; 140 } 141 142 static void udp_v6_hash(struct sock *sk) 143 { 144 BUG(); 145 } 146 147 static void udp_v6_unhash(struct sock *sk) 148 { 149 write_lock_bh(&udp_hash_lock); 150 if (sk_del_node_init(sk)) { 151 inet_sk(sk)->num = 0; 152 sock_prot_dec_use(sk->sk_prot); 153 } 154 write_unlock_bh(&udp_hash_lock); 155 } 156 157 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport, 158 struct in6_addr *daddr, u16 dport, int dif) 159 { 160 struct sock *sk, *result = NULL; 161 struct hlist_node *node; 162 unsigned short hnum = ntohs(dport); 163 int badness = -1; 164 165 read_lock(&udp_hash_lock); 166 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) { 167 struct inet_sock *inet = inet_sk(sk); 168 169 if (inet->num == hnum && sk->sk_family == PF_INET6) { 170 struct ipv6_pinfo *np = inet6_sk(sk); 171 int score = 0; 172 if (inet->dport) { 173 if (inet->dport != sport) 174 continue; 175 score++; 176 } 177 if (!ipv6_addr_any(&np->rcv_saddr)) { 178 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 179 continue; 180 score++; 181 } 182 if (!ipv6_addr_any(&np->daddr)) { 183 if (!ipv6_addr_equal(&np->daddr, saddr)) 184 continue; 185 score++; 186 } 187 if (sk->sk_bound_dev_if) { 188 if (sk->sk_bound_dev_if != dif) 189 continue; 190 score++; 191 } 192 if(score == 4) { 193 result = sk; 194 break; 195 } else if(score > badness) { 196 result = sk; 197 badness = score; 198 } 199 } 200 } 201 if (result) 202 sock_hold(result); 203 read_unlock(&udp_hash_lock); 204 return result; 205 } 206 207 /* 208 * 209 */ 210 211 static void udpv6_close(struct sock *sk, long timeout) 212 { 213 sk_common_release(sk); 214 } 215 216 /* 217 * This should be easy, if there is something there we 218 * return it, otherwise we block. 219 */ 220 221 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 222 struct msghdr *msg, size_t len, 223 int noblock, int flags, int *addr_len) 224 { 225 struct ipv6_pinfo *np = inet6_sk(sk); 226 struct inet_sock *inet = inet_sk(sk); 227 struct sk_buff *skb; 228 size_t copied; 229 int err; 230 231 if (addr_len) 232 *addr_len=sizeof(struct sockaddr_in6); 233 234 if (flags & MSG_ERRQUEUE) 235 return ipv6_recv_error(sk, msg, len); 236 237 try_again: 238 skb = skb_recv_datagram(sk, flags, noblock, &err); 239 if (!skb) 240 goto out; 241 242 copied = skb->len - sizeof(struct udphdr); 243 if (copied > len) { 244 copied = len; 245 msg->msg_flags |= MSG_TRUNC; 246 } 247 248 if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 249 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 250 copied); 251 } else if (msg->msg_flags&MSG_TRUNC) { 252 if (__skb_checksum_complete(skb)) 253 goto csum_copy_err; 254 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 255 copied); 256 } else { 257 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 258 if (err == -EINVAL) 259 goto csum_copy_err; 260 } 261 if (err) 262 goto out_free; 263 264 sock_recv_timestamp(msg, sk, skb); 265 266 /* Copy the address. */ 267 if (msg->msg_name) { 268 struct sockaddr_in6 *sin6; 269 270 sin6 = (struct sockaddr_in6 *) msg->msg_name; 271 sin6->sin6_family = AF_INET6; 272 sin6->sin6_port = skb->h.uh->source; 273 sin6->sin6_flowinfo = 0; 274 sin6->sin6_scope_id = 0; 275 276 if (skb->protocol == htons(ETH_P_IP)) 277 ipv6_addr_set(&sin6->sin6_addr, 0, 0, 278 htonl(0xffff), skb->nh.iph->saddr); 279 else { 280 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 281 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 282 sin6->sin6_scope_id = IP6CB(skb)->iif; 283 } 284 285 } 286 if (skb->protocol == htons(ETH_P_IP)) { 287 if (inet->cmsg_flags) 288 ip_cmsg_recv(msg, skb); 289 } else { 290 if (np->rxopt.all) 291 datagram_recv_ctl(sk, msg, skb); 292 } 293 294 err = copied; 295 if (flags & MSG_TRUNC) 296 err = skb->len - sizeof(struct udphdr); 297 298 out_free: 299 skb_free_datagram(sk, skb); 300 out: 301 return err; 302 303 csum_copy_err: 304 skb_kill_datagram(sk, skb, flags); 305 306 if (flags & MSG_DONTWAIT) { 307 UDP6_INC_STATS_USER(UDP_MIB_INERRORS); 308 return -EAGAIN; 309 } 310 goto try_again; 311 } 312 313 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 314 int type, int code, int offset, __u32 info) 315 { 316 struct ipv6_pinfo *np; 317 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 318 struct net_device *dev = skb->dev; 319 struct in6_addr *saddr = &hdr->saddr; 320 struct in6_addr *daddr = &hdr->daddr; 321 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 322 struct sock *sk; 323 int err; 324 325 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex); 326 327 if (sk == NULL) 328 return; 329 330 np = inet6_sk(sk); 331 332 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 333 goto out; 334 335 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 336 goto out; 337 338 if (np->recverr) 339 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 340 341 sk->sk_err = err; 342 sk->sk_error_report(sk); 343 out: 344 sock_put(sk); 345 } 346 347 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 348 { 349 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 350 kfree_skb(skb); 351 return -1; 352 } 353 354 if (skb_checksum_complete(skb)) { 355 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 356 kfree_skb(skb); 357 return 0; 358 } 359 360 if (sock_queue_rcv_skb(sk,skb)<0) { 361 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 362 kfree_skb(skb); 363 return 0; 364 } 365 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS); 366 return 0; 367 } 368 369 static struct sock *udp_v6_mcast_next(struct sock *sk, 370 u16 loc_port, struct in6_addr *loc_addr, 371 u16 rmt_port, struct in6_addr *rmt_addr, 372 int dif) 373 { 374 struct hlist_node *node; 375 struct sock *s = sk; 376 unsigned short num = ntohs(loc_port); 377 378 sk_for_each_from(s, node) { 379 struct inet_sock *inet = inet_sk(s); 380 381 if (inet->num == num && s->sk_family == PF_INET6) { 382 struct ipv6_pinfo *np = inet6_sk(s); 383 if (inet->dport) { 384 if (inet->dport != rmt_port) 385 continue; 386 } 387 if (!ipv6_addr_any(&np->daddr) && 388 !ipv6_addr_equal(&np->daddr, rmt_addr)) 389 continue; 390 391 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 392 continue; 393 394 if (!ipv6_addr_any(&np->rcv_saddr)) { 395 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 396 continue; 397 } 398 if(!inet6_mc_check(s, loc_addr, rmt_addr)) 399 continue; 400 return s; 401 } 402 } 403 return NULL; 404 } 405 406 /* 407 * Note: called only from the BH handler context, 408 * so we don't need to lock the hashes. 409 */ 410 static void udpv6_mcast_deliver(struct udphdr *uh, 411 struct in6_addr *saddr, struct in6_addr *daddr, 412 struct sk_buff *skb) 413 { 414 struct sock *sk, *sk2; 415 int dif; 416 417 read_lock(&udp_hash_lock); 418 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 419 dif = skb->dev->ifindex; 420 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 421 if (!sk) { 422 kfree_skb(skb); 423 goto out; 424 } 425 426 sk2 = sk; 427 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 428 uh->source, saddr, dif))) { 429 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 430 if (buff) 431 udpv6_queue_rcv_skb(sk2, buff); 432 } 433 udpv6_queue_rcv_skb(sk, skb); 434 out: 435 read_unlock(&udp_hash_lock); 436 } 437 438 static int udpv6_rcv(struct sk_buff **pskb) 439 { 440 struct sk_buff *skb = *pskb; 441 struct sock *sk; 442 struct udphdr *uh; 443 struct net_device *dev = skb->dev; 444 struct in6_addr *saddr, *daddr; 445 u32 ulen = 0; 446 447 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 448 goto short_packet; 449 450 saddr = &skb->nh.ipv6h->saddr; 451 daddr = &skb->nh.ipv6h->daddr; 452 uh = skb->h.uh; 453 454 ulen = ntohs(uh->len); 455 456 /* Check for jumbo payload */ 457 if (ulen == 0) 458 ulen = skb->len; 459 460 if (ulen > skb->len || ulen < sizeof(*uh)) 461 goto short_packet; 462 463 if (uh->check == 0) { 464 /* RFC 2460 section 8.1 says that we SHOULD log 465 this error. Well, it is reasonable. 466 */ 467 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 468 goto discard; 469 } 470 471 if (ulen < skb->len) { 472 if (pskb_trim_rcsum(skb, ulen)) 473 goto discard; 474 saddr = &skb->nh.ipv6h->saddr; 475 daddr = &skb->nh.ipv6h->daddr; 476 uh = skb->h.uh; 477 } 478 479 if (skb->ip_summed == CHECKSUM_HW && 480 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) 481 skb->ip_summed = CHECKSUM_UNNECESSARY; 482 483 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 484 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0); 485 486 /* 487 * Multicast receive code 488 */ 489 if (ipv6_addr_is_multicast(daddr)) { 490 udpv6_mcast_deliver(uh, saddr, daddr, skb); 491 return 0; 492 } 493 494 /* Unicast */ 495 496 /* 497 * check socket cache ... must talk to Alan about his plans 498 * for sock caches... i'll skip this for now. 499 */ 500 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex); 501 502 if (sk == NULL) { 503 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 504 goto discard; 505 506 if (skb_checksum_complete(skb)) 507 goto discard; 508 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS); 509 510 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 511 512 kfree_skb(skb); 513 return(0); 514 } 515 516 /* deliver */ 517 518 udpv6_queue_rcv_skb(sk, skb); 519 sock_put(sk); 520 return(0); 521 522 short_packet: 523 if (net_ratelimit()) 524 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len); 525 526 discard: 527 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 528 kfree_skb(skb); 529 return(0); 530 } 531 /* 532 * Throw away all pending data and cancel the corking. Socket is locked. 533 */ 534 static void udp_v6_flush_pending_frames(struct sock *sk) 535 { 536 struct udp_sock *up = udp_sk(sk); 537 538 if (up->pending) { 539 up->len = 0; 540 up->pending = 0; 541 ip6_flush_pending_frames(sk); 542 } 543 } 544 545 /* 546 * Sending 547 */ 548 549 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up) 550 { 551 struct sk_buff *skb; 552 struct udphdr *uh; 553 struct inet_sock *inet = inet_sk(sk); 554 struct flowi *fl = &inet->cork.fl; 555 int err = 0; 556 557 /* Grab the skbuff where UDP header space exists. */ 558 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 559 goto out; 560 561 /* 562 * Create a UDP header 563 */ 564 uh = skb->h.uh; 565 uh->source = fl->fl_ip_sport; 566 uh->dest = fl->fl_ip_dport; 567 uh->len = htons(up->len); 568 uh->check = 0; 569 570 if (sk->sk_no_check == UDP_CSUM_NOXMIT) { 571 skb->ip_summed = CHECKSUM_NONE; 572 goto send; 573 } 574 575 if (skb_queue_len(&sk->sk_write_queue) == 1) { 576 skb->csum = csum_partial((char *)uh, 577 sizeof(struct udphdr), skb->csum); 578 uh->check = csum_ipv6_magic(&fl->fl6_src, 579 &fl->fl6_dst, 580 up->len, fl->proto, skb->csum); 581 } else { 582 u32 tmp_csum = 0; 583 584 skb_queue_walk(&sk->sk_write_queue, skb) { 585 tmp_csum = csum_add(tmp_csum, skb->csum); 586 } 587 tmp_csum = csum_partial((char *)uh, 588 sizeof(struct udphdr), tmp_csum); 589 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 590 &fl->fl6_dst, 591 up->len, fl->proto, tmp_csum); 592 uh->check = tmp_csum; 593 594 } 595 if (uh->check == 0) 596 uh->check = -1; 597 598 send: 599 err = ip6_push_pending_frames(sk); 600 out: 601 up->len = 0; 602 up->pending = 0; 603 return err; 604 } 605 606 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 607 struct msghdr *msg, size_t len) 608 { 609 struct ipv6_txoptions opt_space; 610 struct udp_sock *up = udp_sk(sk); 611 struct inet_sock *inet = inet_sk(sk); 612 struct ipv6_pinfo *np = inet6_sk(sk); 613 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 614 struct in6_addr *daddr, *final_p = NULL, final; 615 struct ipv6_txoptions *opt = NULL; 616 struct ip6_flowlabel *flowlabel = NULL; 617 struct flowi *fl = &inet->cork.fl; 618 struct dst_entry *dst; 619 int addr_len = msg->msg_namelen; 620 int ulen = len; 621 int hlimit = -1; 622 int tclass = -1; 623 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 624 int err; 625 int connected = 0; 626 627 /* destination address check */ 628 if (sin6) { 629 if (addr_len < offsetof(struct sockaddr, sa_data)) 630 return -EINVAL; 631 632 switch (sin6->sin6_family) { 633 case AF_INET6: 634 if (addr_len < SIN6_LEN_RFC2133) 635 return -EINVAL; 636 daddr = &sin6->sin6_addr; 637 break; 638 case AF_INET: 639 goto do_udp_sendmsg; 640 case AF_UNSPEC: 641 msg->msg_name = sin6 = NULL; 642 msg->msg_namelen = addr_len = 0; 643 daddr = NULL; 644 break; 645 default: 646 return -EINVAL; 647 } 648 } else if (!up->pending) { 649 if (sk->sk_state != TCP_ESTABLISHED) 650 return -EDESTADDRREQ; 651 daddr = &np->daddr; 652 } else 653 daddr = NULL; 654 655 if (daddr) { 656 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 657 struct sockaddr_in sin; 658 sin.sin_family = AF_INET; 659 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 660 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 661 msg->msg_name = &sin; 662 msg->msg_namelen = sizeof(sin); 663 do_udp_sendmsg: 664 if (__ipv6_only_sock(sk)) 665 return -ENETUNREACH; 666 return udp_sendmsg(iocb, sk, msg, len); 667 } 668 } 669 670 if (up->pending == AF_INET) 671 return udp_sendmsg(iocb, sk, msg, len); 672 673 /* Rough check on arithmetic overflow, 674 better check is made in ip6_build_xmit 675 */ 676 if (len > INT_MAX - sizeof(struct udphdr)) 677 return -EMSGSIZE; 678 679 if (up->pending) { 680 /* 681 * There are pending frames. 682 * The socket lock must be held while it's corked. 683 */ 684 lock_sock(sk); 685 if (likely(up->pending)) { 686 if (unlikely(up->pending != AF_INET6)) { 687 release_sock(sk); 688 return -EAFNOSUPPORT; 689 } 690 dst = NULL; 691 goto do_append_data; 692 } 693 release_sock(sk); 694 } 695 ulen += sizeof(struct udphdr); 696 697 memset(fl, 0, sizeof(*fl)); 698 699 if (sin6) { 700 if (sin6->sin6_port == 0) 701 return -EINVAL; 702 703 fl->fl_ip_dport = sin6->sin6_port; 704 daddr = &sin6->sin6_addr; 705 706 if (np->sndflow) { 707 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 708 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 709 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 710 if (flowlabel == NULL) 711 return -EINVAL; 712 daddr = &flowlabel->dst; 713 } 714 } 715 716 /* 717 * Otherwise it will be difficult to maintain 718 * sk->sk_dst_cache. 719 */ 720 if (sk->sk_state == TCP_ESTABLISHED && 721 ipv6_addr_equal(daddr, &np->daddr)) 722 daddr = &np->daddr; 723 724 if (addr_len >= sizeof(struct sockaddr_in6) && 725 sin6->sin6_scope_id && 726 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 727 fl->oif = sin6->sin6_scope_id; 728 } else { 729 if (sk->sk_state != TCP_ESTABLISHED) 730 return -EDESTADDRREQ; 731 732 fl->fl_ip_dport = inet->dport; 733 daddr = &np->daddr; 734 fl->fl6_flowlabel = np->flow_label; 735 connected = 1; 736 } 737 738 if (!fl->oif) 739 fl->oif = sk->sk_bound_dev_if; 740 741 if (msg->msg_controllen) { 742 opt = &opt_space; 743 memset(opt, 0, sizeof(struct ipv6_txoptions)); 744 opt->tot_len = sizeof(*opt); 745 746 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass); 747 if (err < 0) { 748 fl6_sock_release(flowlabel); 749 return err; 750 } 751 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 752 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 753 if (flowlabel == NULL) 754 return -EINVAL; 755 } 756 if (!(opt->opt_nflen|opt->opt_flen)) 757 opt = NULL; 758 connected = 0; 759 } 760 if (opt == NULL) 761 opt = np->opt; 762 if (flowlabel) 763 opt = fl6_merge_options(&opt_space, flowlabel, opt); 764 opt = ipv6_fixup_options(&opt_space, opt); 765 766 fl->proto = IPPROTO_UDP; 767 ipv6_addr_copy(&fl->fl6_dst, daddr); 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 err = ip6_dst_lookup(sk, &dst, fl); 787 if (err) 788 goto out; 789 if (final_p) 790 ipv6_addr_copy(&fl->fl6_dst, final_p); 791 792 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) 793 goto out; 794 795 if (hlimit < 0) { 796 if (ipv6_addr_is_multicast(&fl->fl6_dst)) 797 hlimit = np->mcast_hops; 798 else 799 hlimit = np->hop_limit; 800 if (hlimit < 0) 801 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 802 if (hlimit < 0) 803 hlimit = ipv6_get_hoplimit(dst->dev); 804 } 805 806 if (tclass < 0) { 807 tclass = np->tclass; 808 if (tclass < 0) 809 tclass = 0; 810 } 811 812 if (msg->msg_flags&MSG_CONFIRM) 813 goto do_confirm; 814 back_from_confirm: 815 816 lock_sock(sk); 817 if (unlikely(up->pending)) { 818 /* The socket is already corked while preparing it. */ 819 /* ... which is an evident application bug. --ANK */ 820 release_sock(sk); 821 822 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 823 err = -EINVAL; 824 goto out; 825 } 826 827 up->pending = AF_INET6; 828 829 do_append_data: 830 up->len += ulen; 831 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, 832 sizeof(struct udphdr), hlimit, tclass, opt, fl, 833 (struct rt6_info*)dst, 834 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 835 if (err) 836 udp_v6_flush_pending_frames(sk); 837 else if (!corkreq) 838 err = udp_v6_push_pending_frames(sk, up); 839 840 if (dst) { 841 if (connected) { 842 ip6_dst_store(sk, dst, 843 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ? 844 &np->daddr : NULL); 845 } else { 846 dst_release(dst); 847 } 848 } 849 850 if (err > 0) 851 err = np->recverr ? net_xmit_errno(err) : 0; 852 release_sock(sk); 853 out: 854 fl6_sock_release(flowlabel); 855 if (!err) { 856 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS); 857 return len; 858 } 859 return err; 860 861 do_confirm: 862 dst_confirm(dst); 863 if (!(msg->msg_flags&MSG_PROBE) || len) 864 goto back_from_confirm; 865 err = 0; 866 goto out; 867 } 868 869 static int udpv6_destroy_sock(struct sock *sk) 870 { 871 lock_sock(sk); 872 udp_v6_flush_pending_frames(sk); 873 release_sock(sk); 874 875 inet6_destroy_sock(sk); 876 877 return 0; 878 } 879 880 /* 881 * Socket option code for UDP 882 */ 883 static int udpv6_setsockopt(struct sock *sk, int level, int optname, 884 char __user *optval, int optlen) 885 { 886 struct udp_sock *up = udp_sk(sk); 887 int val; 888 int err = 0; 889 890 if (level != SOL_UDP) 891 return ipv6_setsockopt(sk, level, optname, optval, optlen); 892 893 if(optlen<sizeof(int)) 894 return -EINVAL; 895 896 if (get_user(val, (int __user *)optval)) 897 return -EFAULT; 898 899 switch(optname) { 900 case UDP_CORK: 901 if (val != 0) { 902 up->corkflag = 1; 903 } else { 904 up->corkflag = 0; 905 lock_sock(sk); 906 udp_v6_push_pending_frames(sk, up); 907 release_sock(sk); 908 } 909 break; 910 911 case UDP_ENCAP: 912 switch (val) { 913 case 0: 914 up->encap_type = val; 915 break; 916 default: 917 err = -ENOPROTOOPT; 918 break; 919 } 920 break; 921 922 default: 923 err = -ENOPROTOOPT; 924 break; 925 }; 926 927 return err; 928 } 929 930 static int udpv6_getsockopt(struct sock *sk, int level, int optname, 931 char __user *optval, int __user *optlen) 932 { 933 struct udp_sock *up = udp_sk(sk); 934 int val, len; 935 936 if (level != SOL_UDP) 937 return ipv6_getsockopt(sk, level, optname, optval, optlen); 938 939 if(get_user(len,optlen)) 940 return -EFAULT; 941 942 len = min_t(unsigned int, len, sizeof(int)); 943 944 if(len < 0) 945 return -EINVAL; 946 947 switch(optname) { 948 case UDP_CORK: 949 val = up->corkflag; 950 break; 951 952 case UDP_ENCAP: 953 val = up->encap_type; 954 break; 955 956 default: 957 return -ENOPROTOOPT; 958 }; 959 960 if(put_user(len, optlen)) 961 return -EFAULT; 962 if(copy_to_user(optval, &val,len)) 963 return -EFAULT; 964 return 0; 965 } 966 967 static struct inet6_protocol udpv6_protocol = { 968 .handler = udpv6_rcv, 969 .err_handler = udpv6_err, 970 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 971 }; 972 973 /* ------------------------------------------------------------------------ */ 974 #ifdef CONFIG_PROC_FS 975 976 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 977 { 978 struct inet_sock *inet = inet_sk(sp); 979 struct ipv6_pinfo *np = inet6_sk(sp); 980 struct in6_addr *dest, *src; 981 __u16 destp, srcp; 982 983 dest = &np->daddr; 984 src = &np->rcv_saddr; 985 destp = ntohs(inet->dport); 986 srcp = ntohs(inet->sport); 987 seq_printf(seq, 988 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 989 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 990 bucket, 991 src->s6_addr32[0], src->s6_addr32[1], 992 src->s6_addr32[2], src->s6_addr32[3], srcp, 993 dest->s6_addr32[0], dest->s6_addr32[1], 994 dest->s6_addr32[2], dest->s6_addr32[3], destp, 995 sp->sk_state, 996 atomic_read(&sp->sk_wmem_alloc), 997 atomic_read(&sp->sk_rmem_alloc), 998 0, 0L, 0, 999 sock_i_uid(sp), 0, 1000 sock_i_ino(sp), 1001 atomic_read(&sp->sk_refcnt), sp); 1002 } 1003 1004 static int udp6_seq_show(struct seq_file *seq, void *v) 1005 { 1006 if (v == SEQ_START_TOKEN) 1007 seq_printf(seq, 1008 " sl " 1009 "local_address " 1010 "remote_address " 1011 "st tx_queue rx_queue tr tm->when retrnsmt" 1012 " uid timeout inode\n"); 1013 else 1014 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1015 return 0; 1016 } 1017 1018 static struct file_operations udp6_seq_fops; 1019 static struct udp_seq_afinfo udp6_seq_afinfo = { 1020 .owner = THIS_MODULE, 1021 .name = "udp6", 1022 .family = AF_INET6, 1023 .seq_show = udp6_seq_show, 1024 .seq_fops = &udp6_seq_fops, 1025 }; 1026 1027 int __init udp6_proc_init(void) 1028 { 1029 return udp_proc_register(&udp6_seq_afinfo); 1030 } 1031 1032 void udp6_proc_exit(void) { 1033 udp_proc_unregister(&udp6_seq_afinfo); 1034 } 1035 #endif /* CONFIG_PROC_FS */ 1036 1037 /* ------------------------------------------------------------------------ */ 1038 1039 struct proto udpv6_prot = { 1040 .name = "UDPv6", 1041 .owner = THIS_MODULE, 1042 .close = udpv6_close, 1043 .connect = ip6_datagram_connect, 1044 .disconnect = udp_disconnect, 1045 .ioctl = udp_ioctl, 1046 .destroy = udpv6_destroy_sock, 1047 .setsockopt = udpv6_setsockopt, 1048 .getsockopt = udpv6_getsockopt, 1049 .sendmsg = udpv6_sendmsg, 1050 .recvmsg = udpv6_recvmsg, 1051 .backlog_rcv = udpv6_queue_rcv_skb, 1052 .hash = udp_v6_hash, 1053 .unhash = udp_v6_unhash, 1054 .get_port = udp_v6_get_port, 1055 .obj_size = sizeof(struct udp6_sock), 1056 }; 1057 1058 static struct inet_protosw udpv6_protosw = { 1059 .type = SOCK_DGRAM, 1060 .protocol = IPPROTO_UDP, 1061 .prot = &udpv6_prot, 1062 .ops = &inet6_dgram_ops, 1063 .capability =-1, 1064 .no_check = UDP_CSUM_DEFAULT, 1065 .flags = INET_PROTOSW_PERMANENT, 1066 }; 1067 1068 1069 void __init udpv6_init(void) 1070 { 1071 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1072 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1073 inet6_register_protosw(&udpv6_protosw); 1074 } 1075