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/errno.h> 27 #include <linux/types.h> 28 #include <linux/socket.h> 29 #include <linux/sockios.h> 30 #include <linux/sched.h> 31 #include <linux/net.h> 32 #include <linux/in6.h> 33 #include <linux/netdevice.h> 34 #include <linux/if_arp.h> 35 #include <linux/ipv6.h> 36 #include <linux/icmpv6.h> 37 #include <linux/init.h> 38 #include <linux/skbuff.h> 39 #include <asm/uaccess.h> 40 41 #include <net/sock.h> 42 #include <net/snmp.h> 43 44 #include <net/ipv6.h> 45 #include <net/ndisc.h> 46 #include <net/protocol.h> 47 #include <net/transp_v6.h> 48 #include <net/ip6_route.h> 49 #include <net/addrconf.h> 50 #include <net/ip.h> 51 #include <net/udp.h> 52 #include <net/raw.h> 53 #include <net/inet_common.h> 54 #include <net/tcp_states.h> 55 56 #include <net/ip6_checksum.h> 57 #include <net/xfrm.h> 58 59 #include <linux/proc_fs.h> 60 #include <linux/seq_file.h> 61 62 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly; 63 64 /* Grrr, addr_type already calculated by caller, but I don't want 65 * to add some silly "cookie" argument to this method just for that. 66 */ 67 static int udp_v6_get_port(struct sock *sk, unsigned short snum) 68 { 69 struct sock *sk2; 70 struct hlist_node *node; 71 72 write_lock_bh(&udp_hash_lock); 73 if (snum == 0) { 74 int best_size_so_far, best, result, i; 75 76 if (udp_port_rover > sysctl_local_port_range[1] || 77 udp_port_rover < sysctl_local_port_range[0]) 78 udp_port_rover = sysctl_local_port_range[0]; 79 best_size_so_far = 32767; 80 best = result = udp_port_rover; 81 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) { 82 int size; 83 struct hlist_head *list; 84 85 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)]; 86 if (hlist_empty(list)) { 87 if (result > sysctl_local_port_range[1]) 88 result = sysctl_local_port_range[0] + 89 ((result - sysctl_local_port_range[0]) & 90 (UDP_HTABLE_SIZE - 1)); 91 goto gotit; 92 } 93 size = 0; 94 sk_for_each(sk2, node, list) 95 if (++size >= best_size_so_far) 96 goto next; 97 best_size_so_far = size; 98 best = result; 99 next:; 100 } 101 result = best; 102 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) { 103 if (result > sysctl_local_port_range[1]) 104 result = sysctl_local_port_range[0] 105 + ((result - sysctl_local_port_range[0]) & 106 (UDP_HTABLE_SIZE - 1)); 107 if (!udp_lport_inuse(result)) 108 break; 109 } 110 if (i >= (1 << 16) / UDP_HTABLE_SIZE) 111 goto fail; 112 gotit: 113 udp_port_rover = snum = result; 114 } else { 115 sk_for_each(sk2, node, 116 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) { 117 if (inet_sk(sk2)->num == snum && 118 sk2 != sk && 119 (!sk2->sk_bound_dev_if || 120 !sk->sk_bound_dev_if || 121 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && 122 (!sk2->sk_reuse || !sk->sk_reuse) && 123 ipv6_rcv_saddr_equal(sk, sk2)) 124 goto fail; 125 } 126 } 127 128 inet_sk(sk)->num = snum; 129 if (sk_unhashed(sk)) { 130 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]); 131 sock_prot_inc_use(sk->sk_prot); 132 } 133 write_unlock_bh(&udp_hash_lock); 134 return 0; 135 136 fail: 137 write_unlock_bh(&udp_hash_lock); 138 return 1; 139 } 140 141 static void udp_v6_hash(struct sock *sk) 142 { 143 BUG(); 144 } 145 146 static void udp_v6_unhash(struct sock *sk) 147 { 148 write_lock_bh(&udp_hash_lock); 149 if (sk_del_node_init(sk)) { 150 inet_sk(sk)->num = 0; 151 sock_prot_dec_use(sk->sk_prot); 152 } 153 write_unlock_bh(&udp_hash_lock); 154 } 155 156 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport, 157 struct in6_addr *daddr, u16 dport, int dif) 158 { 159 struct sock *sk, *result = NULL; 160 struct hlist_node *node; 161 unsigned short hnum = ntohs(dport); 162 int badness = -1; 163 164 read_lock(&udp_hash_lock); 165 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) { 166 struct inet_sock *inet = inet_sk(sk); 167 168 if (inet->num == hnum && sk->sk_family == PF_INET6) { 169 struct ipv6_pinfo *np = inet6_sk(sk); 170 int score = 0; 171 if (inet->dport) { 172 if (inet->dport != sport) 173 continue; 174 score++; 175 } 176 if (!ipv6_addr_any(&np->rcv_saddr)) { 177 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 178 continue; 179 score++; 180 } 181 if (!ipv6_addr_any(&np->daddr)) { 182 if (!ipv6_addr_equal(&np->daddr, saddr)) 183 continue; 184 score++; 185 } 186 if (sk->sk_bound_dev_if) { 187 if (sk->sk_bound_dev_if != dif) 188 continue; 189 score++; 190 } 191 if(score == 4) { 192 result = sk; 193 break; 194 } else if(score > badness) { 195 result = sk; 196 badness = score; 197 } 198 } 199 } 200 if (result) 201 sock_hold(result); 202 read_unlock(&udp_hash_lock); 203 return result; 204 } 205 206 /* 207 * 208 */ 209 210 static void udpv6_close(struct sock *sk, long timeout) 211 { 212 sk_common_release(sk); 213 } 214 215 /* 216 * This should be easy, if there is something there we 217 * return it, otherwise we block. 218 */ 219 220 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 221 struct msghdr *msg, size_t len, 222 int noblock, int flags, int *addr_len) 223 { 224 struct ipv6_pinfo *np = inet6_sk(sk); 225 struct inet_sock *inet = inet_sk(sk); 226 struct sk_buff *skb; 227 size_t copied; 228 int err; 229 230 if (addr_len) 231 *addr_len=sizeof(struct sockaddr_in6); 232 233 if (flags & MSG_ERRQUEUE) 234 return ipv6_recv_error(sk, msg, len); 235 236 try_again: 237 skb = skb_recv_datagram(sk, flags, noblock, &err); 238 if (!skb) 239 goto out; 240 241 copied = skb->len - sizeof(struct udphdr); 242 if (copied > len) { 243 copied = len; 244 msg->msg_flags |= MSG_TRUNC; 245 } 246 247 if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 248 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 249 copied); 250 } else if (msg->msg_flags&MSG_TRUNC) { 251 if (__skb_checksum_complete(skb)) 252 goto csum_copy_err; 253 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 254 copied); 255 } else { 256 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 257 if (err == -EINVAL) 258 goto csum_copy_err; 259 } 260 if (err) 261 goto out_free; 262 263 sock_recv_timestamp(msg, sk, skb); 264 265 /* Copy the address. */ 266 if (msg->msg_name) { 267 struct sockaddr_in6 *sin6; 268 269 sin6 = (struct sockaddr_in6 *) msg->msg_name; 270 sin6->sin6_family = AF_INET6; 271 sin6->sin6_port = skb->h.uh->source; 272 sin6->sin6_flowinfo = 0; 273 sin6->sin6_scope_id = 0; 274 275 if (skb->protocol == htons(ETH_P_IP)) 276 ipv6_addr_set(&sin6->sin6_addr, 0, 0, 277 htonl(0xffff), skb->nh.iph->saddr); 278 else { 279 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 280 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 281 sin6->sin6_scope_id = IP6CB(skb)->iif; 282 } 283 284 } 285 if (skb->protocol == htons(ETH_P_IP)) { 286 if (inet->cmsg_flags) 287 ip_cmsg_recv(msg, skb); 288 } else { 289 if (np->rxopt.all) 290 datagram_recv_ctl(sk, msg, skb); 291 } 292 293 err = copied; 294 if (flags & MSG_TRUNC) 295 err = skb->len - sizeof(struct udphdr); 296 297 out_free: 298 skb_free_datagram(sk, skb); 299 out: 300 return err; 301 302 csum_copy_err: 303 skb_kill_datagram(sk, skb, flags); 304 305 if (flags & MSG_DONTWAIT) { 306 UDP6_INC_STATS_USER(UDP_MIB_INERRORS); 307 return -EAGAIN; 308 } 309 goto try_again; 310 } 311 312 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 313 int type, int code, int offset, __u32 info) 314 { 315 struct ipv6_pinfo *np; 316 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 317 struct net_device *dev = skb->dev; 318 struct in6_addr *saddr = &hdr->saddr; 319 struct in6_addr *daddr = &hdr->daddr; 320 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 321 struct sock *sk; 322 int err; 323 324 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex); 325 326 if (sk == NULL) 327 return; 328 329 np = inet6_sk(sk); 330 331 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 332 goto out; 333 334 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 335 goto out; 336 337 if (np->recverr) 338 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 339 340 sk->sk_err = err; 341 sk->sk_error_report(sk); 342 out: 343 sock_put(sk); 344 } 345 346 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 347 { 348 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 349 kfree_skb(skb); 350 return -1; 351 } 352 353 if (skb_checksum_complete(skb)) { 354 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 355 kfree_skb(skb); 356 return 0; 357 } 358 359 if (sock_queue_rcv_skb(sk,skb)<0) { 360 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 361 kfree_skb(skb); 362 return 0; 363 } 364 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS); 365 return 0; 366 } 367 368 static struct sock *udp_v6_mcast_next(struct sock *sk, 369 u16 loc_port, struct in6_addr *loc_addr, 370 u16 rmt_port, struct in6_addr *rmt_addr, 371 int dif) 372 { 373 struct hlist_node *node; 374 struct sock *s = sk; 375 unsigned short num = ntohs(loc_port); 376 377 sk_for_each_from(s, node) { 378 struct inet_sock *inet = inet_sk(s); 379 380 if (inet->num == num && s->sk_family == PF_INET6) { 381 struct ipv6_pinfo *np = inet6_sk(s); 382 if (inet->dport) { 383 if (inet->dport != rmt_port) 384 continue; 385 } 386 if (!ipv6_addr_any(&np->daddr) && 387 !ipv6_addr_equal(&np->daddr, rmt_addr)) 388 continue; 389 390 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 391 continue; 392 393 if (!ipv6_addr_any(&np->rcv_saddr)) { 394 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 395 continue; 396 } 397 if(!inet6_mc_check(s, loc_addr, rmt_addr)) 398 continue; 399 return s; 400 } 401 } 402 return NULL; 403 } 404 405 /* 406 * Note: called only from the BH handler context, 407 * so we don't need to lock the hashes. 408 */ 409 static void udpv6_mcast_deliver(struct udphdr *uh, 410 struct in6_addr *saddr, struct in6_addr *daddr, 411 struct sk_buff *skb) 412 { 413 struct sock *sk, *sk2; 414 int dif; 415 416 read_lock(&udp_hash_lock); 417 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 418 dif = skb->dev->ifindex; 419 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 420 if (!sk) { 421 kfree_skb(skb); 422 goto out; 423 } 424 425 sk2 = sk; 426 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 427 uh->source, saddr, dif))) { 428 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 429 if (buff) 430 udpv6_queue_rcv_skb(sk2, buff); 431 } 432 udpv6_queue_rcv_skb(sk, skb); 433 out: 434 read_unlock(&udp_hash_lock); 435 } 436 437 static int udpv6_rcv(struct sk_buff **pskb) 438 { 439 struct sk_buff *skb = *pskb; 440 struct sock *sk; 441 struct udphdr *uh; 442 struct net_device *dev = skb->dev; 443 struct in6_addr *saddr, *daddr; 444 u32 ulen = 0; 445 446 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 447 goto short_packet; 448 449 saddr = &skb->nh.ipv6h->saddr; 450 daddr = &skb->nh.ipv6h->daddr; 451 uh = skb->h.uh; 452 453 ulen = ntohs(uh->len); 454 455 /* Check for jumbo payload */ 456 if (ulen == 0) 457 ulen = skb->len; 458 459 if (ulen > skb->len || ulen < sizeof(*uh)) 460 goto short_packet; 461 462 if (uh->check == 0) { 463 /* RFC 2460 section 8.1 says that we SHOULD log 464 this error. Well, it is reasonable. 465 */ 466 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 467 goto discard; 468 } 469 470 if (ulen < skb->len) { 471 if (pskb_trim_rcsum(skb, ulen)) 472 goto discard; 473 saddr = &skb->nh.ipv6h->saddr; 474 daddr = &skb->nh.ipv6h->daddr; 475 uh = skb->h.uh; 476 } 477 478 if (skb->ip_summed == CHECKSUM_HW && 479 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) 480 skb->ip_summed = CHECKSUM_UNNECESSARY; 481 482 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 483 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0); 484 485 /* 486 * Multicast receive code 487 */ 488 if (ipv6_addr_is_multicast(daddr)) { 489 udpv6_mcast_deliver(uh, saddr, daddr, skb); 490 return 0; 491 } 492 493 /* Unicast */ 494 495 /* 496 * check socket cache ... must talk to Alan about his plans 497 * for sock caches... i'll skip this for now. 498 */ 499 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex); 500 501 if (sk == NULL) { 502 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 503 goto discard; 504 505 if (skb_checksum_complete(skb)) 506 goto discard; 507 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS); 508 509 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 510 511 kfree_skb(skb); 512 return(0); 513 } 514 515 /* deliver */ 516 517 udpv6_queue_rcv_skb(sk, skb); 518 sock_put(sk); 519 return(0); 520 521 short_packet: 522 if (net_ratelimit()) 523 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len); 524 525 discard: 526 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 527 kfree_skb(skb); 528 return(0); 529 } 530 /* 531 * Throw away all pending data and cancel the corking. Socket is locked. 532 */ 533 static void udp_v6_flush_pending_frames(struct sock *sk) 534 { 535 struct udp_sock *up = udp_sk(sk); 536 537 if (up->pending) { 538 up->len = 0; 539 up->pending = 0; 540 ip6_flush_pending_frames(sk); 541 } 542 } 543 544 /* 545 * Sending 546 */ 547 548 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up) 549 { 550 struct sk_buff *skb; 551 struct udphdr *uh; 552 struct inet_sock *inet = inet_sk(sk); 553 struct flowi *fl = &inet->cork.fl; 554 int err = 0; 555 556 /* Grab the skbuff where UDP header space exists. */ 557 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 558 goto out; 559 560 /* 561 * Create a UDP header 562 */ 563 uh = skb->h.uh; 564 uh->source = fl->fl_ip_sport; 565 uh->dest = fl->fl_ip_dport; 566 uh->len = htons(up->len); 567 uh->check = 0; 568 569 if (sk->sk_no_check == UDP_CSUM_NOXMIT) { 570 skb->ip_summed = CHECKSUM_NONE; 571 goto send; 572 } 573 574 if (skb_queue_len(&sk->sk_write_queue) == 1) { 575 skb->csum = csum_partial((char *)uh, 576 sizeof(struct udphdr), skb->csum); 577 uh->check = csum_ipv6_magic(&fl->fl6_src, 578 &fl->fl6_dst, 579 up->len, fl->proto, skb->csum); 580 } else { 581 u32 tmp_csum = 0; 582 583 skb_queue_walk(&sk->sk_write_queue, skb) { 584 tmp_csum = csum_add(tmp_csum, skb->csum); 585 } 586 tmp_csum = csum_partial((char *)uh, 587 sizeof(struct udphdr), tmp_csum); 588 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 589 &fl->fl6_dst, 590 up->len, fl->proto, tmp_csum); 591 uh->check = tmp_csum; 592 593 } 594 if (uh->check == 0) 595 uh->check = -1; 596 597 send: 598 err = ip6_push_pending_frames(sk); 599 out: 600 up->len = 0; 601 up->pending = 0; 602 return err; 603 } 604 605 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 606 struct msghdr *msg, size_t len) 607 { 608 struct ipv6_txoptions opt_space; 609 struct udp_sock *up = udp_sk(sk); 610 struct inet_sock *inet = inet_sk(sk); 611 struct ipv6_pinfo *np = inet6_sk(sk); 612 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 613 struct in6_addr *daddr, *final_p = NULL, final; 614 struct ipv6_txoptions *opt = NULL; 615 struct ip6_flowlabel *flowlabel = NULL; 616 struct flowi *fl = &inet->cork.fl; 617 struct dst_entry *dst; 618 int addr_len = msg->msg_namelen; 619 int ulen = len; 620 int hlimit = -1; 621 int tclass = -1; 622 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 623 int err; 624 int connected = 0; 625 626 /* destination address check */ 627 if (sin6) { 628 if (addr_len < offsetof(struct sockaddr, sa_data)) 629 return -EINVAL; 630 631 switch (sin6->sin6_family) { 632 case AF_INET6: 633 if (addr_len < SIN6_LEN_RFC2133) 634 return -EINVAL; 635 daddr = &sin6->sin6_addr; 636 break; 637 case AF_INET: 638 goto do_udp_sendmsg; 639 case AF_UNSPEC: 640 msg->msg_name = sin6 = NULL; 641 msg->msg_namelen = addr_len = 0; 642 daddr = NULL; 643 break; 644 default: 645 return -EINVAL; 646 } 647 } else if (!up->pending) { 648 if (sk->sk_state != TCP_ESTABLISHED) 649 return -EDESTADDRREQ; 650 daddr = &np->daddr; 651 } else 652 daddr = NULL; 653 654 if (daddr) { 655 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 656 struct sockaddr_in sin; 657 sin.sin_family = AF_INET; 658 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 659 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 660 msg->msg_name = &sin; 661 msg->msg_namelen = sizeof(sin); 662 do_udp_sendmsg: 663 if (__ipv6_only_sock(sk)) 664 return -ENETUNREACH; 665 return udp_sendmsg(iocb, sk, msg, len); 666 } 667 } 668 669 if (up->pending == AF_INET) 670 return udp_sendmsg(iocb, sk, msg, len); 671 672 /* Rough check on arithmetic overflow, 673 better check is made in ip6_build_xmit 674 */ 675 if (len > INT_MAX - sizeof(struct udphdr)) 676 return -EMSGSIZE; 677 678 if (up->pending) { 679 /* 680 * There are pending frames. 681 * The socket lock must be held while it's corked. 682 */ 683 lock_sock(sk); 684 if (likely(up->pending)) { 685 if (unlikely(up->pending != AF_INET6)) { 686 release_sock(sk); 687 return -EAFNOSUPPORT; 688 } 689 dst = NULL; 690 goto do_append_data; 691 } 692 release_sock(sk); 693 } 694 ulen += sizeof(struct udphdr); 695 696 memset(fl, 0, sizeof(*fl)); 697 698 if (sin6) { 699 if (sin6->sin6_port == 0) 700 return -EINVAL; 701 702 fl->fl_ip_dport = sin6->sin6_port; 703 daddr = &sin6->sin6_addr; 704 705 if (np->sndflow) { 706 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 707 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 708 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 709 if (flowlabel == NULL) 710 return -EINVAL; 711 daddr = &flowlabel->dst; 712 } 713 } 714 715 /* 716 * Otherwise it will be difficult to maintain 717 * sk->sk_dst_cache. 718 */ 719 if (sk->sk_state == TCP_ESTABLISHED && 720 ipv6_addr_equal(daddr, &np->daddr)) 721 daddr = &np->daddr; 722 723 if (addr_len >= sizeof(struct sockaddr_in6) && 724 sin6->sin6_scope_id && 725 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 726 fl->oif = sin6->sin6_scope_id; 727 } else { 728 if (sk->sk_state != TCP_ESTABLISHED) 729 return -EDESTADDRREQ; 730 731 fl->fl_ip_dport = inet->dport; 732 daddr = &np->daddr; 733 fl->fl6_flowlabel = np->flow_label; 734 connected = 1; 735 } 736 737 if (!fl->oif) 738 fl->oif = sk->sk_bound_dev_if; 739 740 if (msg->msg_controllen) { 741 opt = &opt_space; 742 memset(opt, 0, sizeof(struct ipv6_txoptions)); 743 opt->tot_len = sizeof(*opt); 744 745 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass); 746 if (err < 0) { 747 fl6_sock_release(flowlabel); 748 return err; 749 } 750 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 751 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 752 if (flowlabel == NULL) 753 return -EINVAL; 754 } 755 if (!(opt->opt_nflen|opt->opt_flen)) 756 opt = NULL; 757 connected = 0; 758 } 759 if (opt == NULL) 760 opt = np->opt; 761 if (flowlabel) 762 opt = fl6_merge_options(&opt_space, flowlabel, opt); 763 opt = ipv6_fixup_options(&opt_space, opt); 764 765 fl->proto = IPPROTO_UDP; 766 ipv6_addr_copy(&fl->fl6_dst, daddr); 767 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr)) 768 ipv6_addr_copy(&fl->fl6_src, &np->saddr); 769 fl->fl_ip_sport = inet->sport; 770 771 /* merge ip6_build_xmit from ip6_output */ 772 if (opt && opt->srcrt) { 773 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 774 ipv6_addr_copy(&final, &fl->fl6_dst); 775 ipv6_addr_copy(&fl->fl6_dst, rt0->addr); 776 final_p = &final; 777 connected = 0; 778 } 779 780 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) { 781 fl->oif = np->mcast_oif; 782 connected = 0; 783 } 784 785 err = ip6_sk_dst_lookup(sk, &dst, fl); 786 if (err) 787 goto out; 788 if (final_p) 789 ipv6_addr_copy(&fl->fl6_dst, final_p); 790 791 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) 792 goto out; 793 794 if (hlimit < 0) { 795 if (ipv6_addr_is_multicast(&fl->fl6_dst)) 796 hlimit = np->mcast_hops; 797 else 798 hlimit = np->hop_limit; 799 if (hlimit < 0) 800 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 801 if (hlimit < 0) 802 hlimit = ipv6_get_hoplimit(dst->dev); 803 } 804 805 if (tclass < 0) { 806 tclass = np->tclass; 807 if (tclass < 0) 808 tclass = 0; 809 } 810 811 if (msg->msg_flags&MSG_CONFIRM) 812 goto do_confirm; 813 back_from_confirm: 814 815 lock_sock(sk); 816 if (unlikely(up->pending)) { 817 /* The socket is already corked while preparing it. */ 818 /* ... which is an evident application bug. --ANK */ 819 release_sock(sk); 820 821 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 822 err = -EINVAL; 823 goto out; 824 } 825 826 up->pending = AF_INET6; 827 828 do_append_data: 829 up->len += ulen; 830 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, 831 sizeof(struct udphdr), hlimit, tclass, opt, fl, 832 (struct rt6_info*)dst, 833 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 834 if (err) 835 udp_v6_flush_pending_frames(sk); 836 else if (!corkreq) 837 err = udp_v6_push_pending_frames(sk, up); 838 839 if (dst) { 840 if (connected) { 841 ip6_dst_store(sk, dst, 842 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ? 843 &np->daddr : NULL); 844 } else { 845 dst_release(dst); 846 } 847 } 848 849 if (err > 0) 850 err = np->recverr ? net_xmit_errno(err) : 0; 851 release_sock(sk); 852 out: 853 fl6_sock_release(flowlabel); 854 if (!err) { 855 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS); 856 return len; 857 } 858 return err; 859 860 do_confirm: 861 dst_confirm(dst); 862 if (!(msg->msg_flags&MSG_PROBE) || len) 863 goto back_from_confirm; 864 err = 0; 865 goto out; 866 } 867 868 static int udpv6_destroy_sock(struct sock *sk) 869 { 870 lock_sock(sk); 871 udp_v6_flush_pending_frames(sk); 872 release_sock(sk); 873 874 inet6_destroy_sock(sk); 875 876 return 0; 877 } 878 879 /* 880 * Socket option code for UDP 881 */ 882 static int do_udpv6_setsockopt(struct sock *sk, int level, int optname, 883 char __user *optval, int optlen) 884 { 885 struct udp_sock *up = udp_sk(sk); 886 int val; 887 int err = 0; 888 889 if(optlen<sizeof(int)) 890 return -EINVAL; 891 892 if (get_user(val, (int __user *)optval)) 893 return -EFAULT; 894 895 switch(optname) { 896 case UDP_CORK: 897 if (val != 0) { 898 up->corkflag = 1; 899 } else { 900 up->corkflag = 0; 901 lock_sock(sk); 902 udp_v6_push_pending_frames(sk, up); 903 release_sock(sk); 904 } 905 break; 906 907 case UDP_ENCAP: 908 switch (val) { 909 case 0: 910 up->encap_type = val; 911 break; 912 default: 913 err = -ENOPROTOOPT; 914 break; 915 } 916 break; 917 918 default: 919 err = -ENOPROTOOPT; 920 break; 921 }; 922 923 return err; 924 } 925 926 static int udpv6_setsockopt(struct sock *sk, int level, int optname, 927 char __user *optval, int optlen) 928 { 929 if (level != SOL_UDP) 930 return ipv6_setsockopt(sk, level, optname, optval, optlen); 931 return do_udpv6_setsockopt(sk, level, optname, optval, optlen); 932 } 933 934 #ifdef CONFIG_COMPAT 935 static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 936 char __user *optval, int optlen) 937 { 938 if (level != SOL_UDP) 939 return compat_ipv6_setsockopt(sk, level, optname, 940 optval, optlen); 941 return do_udpv6_setsockopt(sk, level, optname, optval, optlen); 942 } 943 #endif 944 945 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname, 946 char __user *optval, int __user *optlen) 947 { 948 struct udp_sock *up = udp_sk(sk); 949 int val, len; 950 951 if(get_user(len,optlen)) 952 return -EFAULT; 953 954 len = min_t(unsigned int, len, sizeof(int)); 955 956 if(len < 0) 957 return -EINVAL; 958 959 switch(optname) { 960 case UDP_CORK: 961 val = up->corkflag; 962 break; 963 964 case UDP_ENCAP: 965 val = up->encap_type; 966 break; 967 968 default: 969 return -ENOPROTOOPT; 970 }; 971 972 if(put_user(len, optlen)) 973 return -EFAULT; 974 if(copy_to_user(optval, &val,len)) 975 return -EFAULT; 976 return 0; 977 } 978 979 static int udpv6_getsockopt(struct sock *sk, int level, int optname, 980 char __user *optval, int __user *optlen) 981 { 982 if (level != SOL_UDP) 983 return ipv6_getsockopt(sk, level, optname, optval, optlen); 984 return do_udpv6_getsockopt(sk, level, optname, optval, optlen); 985 } 986 987 #ifdef CONFIG_COMPAT 988 static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 989 char __user *optval, int __user *optlen) 990 { 991 if (level != SOL_UDP) 992 return compat_ipv6_getsockopt(sk, level, optname, 993 optval, optlen); 994 return do_udpv6_getsockopt(sk, level, optname, optval, optlen); 995 } 996 #endif 997 998 static struct inet6_protocol udpv6_protocol = { 999 .handler = udpv6_rcv, 1000 .err_handler = udpv6_err, 1001 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1002 }; 1003 1004 /* ------------------------------------------------------------------------ */ 1005 #ifdef CONFIG_PROC_FS 1006 1007 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1008 { 1009 struct inet_sock *inet = inet_sk(sp); 1010 struct ipv6_pinfo *np = inet6_sk(sp); 1011 struct in6_addr *dest, *src; 1012 __u16 destp, srcp; 1013 1014 dest = &np->daddr; 1015 src = &np->rcv_saddr; 1016 destp = ntohs(inet->dport); 1017 srcp = ntohs(inet->sport); 1018 seq_printf(seq, 1019 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1020 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1021 bucket, 1022 src->s6_addr32[0], src->s6_addr32[1], 1023 src->s6_addr32[2], src->s6_addr32[3], srcp, 1024 dest->s6_addr32[0], dest->s6_addr32[1], 1025 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1026 sp->sk_state, 1027 atomic_read(&sp->sk_wmem_alloc), 1028 atomic_read(&sp->sk_rmem_alloc), 1029 0, 0L, 0, 1030 sock_i_uid(sp), 0, 1031 sock_i_ino(sp), 1032 atomic_read(&sp->sk_refcnt), sp); 1033 } 1034 1035 static int udp6_seq_show(struct seq_file *seq, void *v) 1036 { 1037 if (v == SEQ_START_TOKEN) 1038 seq_printf(seq, 1039 " sl " 1040 "local_address " 1041 "remote_address " 1042 "st tx_queue rx_queue tr tm->when retrnsmt" 1043 " uid timeout inode\n"); 1044 else 1045 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1046 return 0; 1047 } 1048 1049 static struct file_operations udp6_seq_fops; 1050 static struct udp_seq_afinfo udp6_seq_afinfo = { 1051 .owner = THIS_MODULE, 1052 .name = "udp6", 1053 .family = AF_INET6, 1054 .seq_show = udp6_seq_show, 1055 .seq_fops = &udp6_seq_fops, 1056 }; 1057 1058 int __init udp6_proc_init(void) 1059 { 1060 return udp_proc_register(&udp6_seq_afinfo); 1061 } 1062 1063 void udp6_proc_exit(void) { 1064 udp_proc_unregister(&udp6_seq_afinfo); 1065 } 1066 #endif /* CONFIG_PROC_FS */ 1067 1068 /* ------------------------------------------------------------------------ */ 1069 1070 struct proto udpv6_prot = { 1071 .name = "UDPv6", 1072 .owner = THIS_MODULE, 1073 .close = udpv6_close, 1074 .connect = ip6_datagram_connect, 1075 .disconnect = udp_disconnect, 1076 .ioctl = udp_ioctl, 1077 .destroy = udpv6_destroy_sock, 1078 .setsockopt = udpv6_setsockopt, 1079 .getsockopt = udpv6_getsockopt, 1080 .sendmsg = udpv6_sendmsg, 1081 .recvmsg = udpv6_recvmsg, 1082 .backlog_rcv = udpv6_queue_rcv_skb, 1083 .hash = udp_v6_hash, 1084 .unhash = udp_v6_unhash, 1085 .get_port = udp_v6_get_port, 1086 .obj_size = sizeof(struct udp6_sock), 1087 #ifdef CONFIG_COMPAT 1088 .compat_setsockopt = compat_udpv6_setsockopt, 1089 .compat_getsockopt = compat_udpv6_getsockopt, 1090 #endif 1091 }; 1092 1093 static struct inet_protosw udpv6_protosw = { 1094 .type = SOCK_DGRAM, 1095 .protocol = IPPROTO_UDP, 1096 .prot = &udpv6_prot, 1097 .ops = &inet6_dgram_ops, 1098 .capability =-1, 1099 .no_check = UDP_CSUM_DEFAULT, 1100 .flags = INET_PROTOSW_PERMANENT, 1101 }; 1102 1103 1104 void __init udpv6_init(void) 1105 { 1106 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1107 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1108 inet6_register_protosw(&udpv6_protosw); 1109 } 1110