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 <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 /* Clear queue. */ 304 if (flags&MSG_PEEK) { 305 int clear = 0; 306 spin_lock_bh(&sk->sk_receive_queue.lock); 307 if (skb == skb_peek(&sk->sk_receive_queue)) { 308 __skb_unlink(skb, &sk->sk_receive_queue); 309 clear = 1; 310 } 311 spin_unlock_bh(&sk->sk_receive_queue.lock); 312 if (clear) 313 kfree_skb(skb); 314 } 315 316 skb_free_datagram(sk, skb); 317 318 if (flags & MSG_DONTWAIT) { 319 UDP6_INC_STATS_USER(UDP_MIB_INERRORS); 320 return -EAGAIN; 321 } 322 goto try_again; 323 } 324 325 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 326 int type, int code, int offset, __u32 info) 327 { 328 struct ipv6_pinfo *np; 329 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 330 struct net_device *dev = skb->dev; 331 struct in6_addr *saddr = &hdr->saddr; 332 struct in6_addr *daddr = &hdr->daddr; 333 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 334 struct sock *sk; 335 int err; 336 337 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex); 338 339 if (sk == NULL) 340 return; 341 342 np = inet6_sk(sk); 343 344 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 345 goto out; 346 347 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 348 goto out; 349 350 if (np->recverr) 351 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 352 353 sk->sk_err = err; 354 sk->sk_error_report(sk); 355 out: 356 sock_put(sk); 357 } 358 359 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 360 { 361 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 362 kfree_skb(skb); 363 return -1; 364 } 365 366 if (skb_checksum_complete(skb)) { 367 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 368 kfree_skb(skb); 369 return 0; 370 } 371 372 if (sock_queue_rcv_skb(sk,skb)<0) { 373 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 374 kfree_skb(skb); 375 return 0; 376 } 377 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS); 378 return 0; 379 } 380 381 static struct sock *udp_v6_mcast_next(struct sock *sk, 382 u16 loc_port, struct in6_addr *loc_addr, 383 u16 rmt_port, struct in6_addr *rmt_addr, 384 int dif) 385 { 386 struct hlist_node *node; 387 struct sock *s = sk; 388 unsigned short num = ntohs(loc_port); 389 390 sk_for_each_from(s, node) { 391 struct inet_sock *inet = inet_sk(s); 392 393 if (inet->num == num && s->sk_family == PF_INET6) { 394 struct ipv6_pinfo *np = inet6_sk(s); 395 if (inet->dport) { 396 if (inet->dport != rmt_port) 397 continue; 398 } 399 if (!ipv6_addr_any(&np->daddr) && 400 !ipv6_addr_equal(&np->daddr, rmt_addr)) 401 continue; 402 403 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 404 continue; 405 406 if (!ipv6_addr_any(&np->rcv_saddr)) { 407 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 408 continue; 409 } 410 if(!inet6_mc_check(s, loc_addr, rmt_addr)) 411 continue; 412 return s; 413 } 414 } 415 return NULL; 416 } 417 418 /* 419 * Note: called only from the BH handler context, 420 * so we don't need to lock the hashes. 421 */ 422 static void udpv6_mcast_deliver(struct udphdr *uh, 423 struct in6_addr *saddr, struct in6_addr *daddr, 424 struct sk_buff *skb) 425 { 426 struct sock *sk, *sk2; 427 int dif; 428 429 read_lock(&udp_hash_lock); 430 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 431 dif = skb->dev->ifindex; 432 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 433 if (!sk) { 434 kfree_skb(skb); 435 goto out; 436 } 437 438 sk2 = sk; 439 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 440 uh->source, saddr, dif))) { 441 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 442 if (buff) 443 udpv6_queue_rcv_skb(sk2, buff); 444 } 445 udpv6_queue_rcv_skb(sk, skb); 446 out: 447 read_unlock(&udp_hash_lock); 448 } 449 450 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) 451 { 452 struct sk_buff *skb = *pskb; 453 struct sock *sk; 454 struct udphdr *uh; 455 struct net_device *dev = skb->dev; 456 struct in6_addr *saddr, *daddr; 457 u32 ulen = 0; 458 459 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 460 goto short_packet; 461 462 saddr = &skb->nh.ipv6h->saddr; 463 daddr = &skb->nh.ipv6h->daddr; 464 uh = skb->h.uh; 465 466 ulen = ntohs(uh->len); 467 468 /* Check for jumbo payload */ 469 if (ulen == 0) 470 ulen = skb->len; 471 472 if (ulen > skb->len || ulen < sizeof(*uh)) 473 goto short_packet; 474 475 if (uh->check == 0) { 476 /* RFC 2460 section 8.1 says that we SHOULD log 477 this error. Well, it is reasonable. 478 */ 479 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 480 goto discard; 481 } 482 483 if (ulen < skb->len) { 484 if (pskb_trim_rcsum(skb, ulen)) 485 goto discard; 486 saddr = &skb->nh.ipv6h->saddr; 487 daddr = &skb->nh.ipv6h->daddr; 488 uh = skb->h.uh; 489 } 490 491 if (skb->ip_summed == CHECKSUM_HW && 492 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) 493 skb->ip_summed = CHECKSUM_UNNECESSARY; 494 495 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 496 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0); 497 498 /* 499 * Multicast receive code 500 */ 501 if (ipv6_addr_is_multicast(daddr)) { 502 udpv6_mcast_deliver(uh, saddr, daddr, skb); 503 return 0; 504 } 505 506 /* Unicast */ 507 508 /* 509 * check socket cache ... must talk to Alan about his plans 510 * for sock caches... i'll skip this for now. 511 */ 512 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex); 513 514 if (sk == NULL) { 515 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 516 goto discard; 517 518 if (skb_checksum_complete(skb)) 519 goto discard; 520 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS); 521 522 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 523 524 kfree_skb(skb); 525 return(0); 526 } 527 528 /* deliver */ 529 530 udpv6_queue_rcv_skb(sk, skb); 531 sock_put(sk); 532 return(0); 533 534 short_packet: 535 if (net_ratelimit()) 536 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len); 537 538 discard: 539 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 540 kfree_skb(skb); 541 return(0); 542 } 543 /* 544 * Throw away all pending data and cancel the corking. Socket is locked. 545 */ 546 static void udp_v6_flush_pending_frames(struct sock *sk) 547 { 548 struct udp_sock *up = udp_sk(sk); 549 550 if (up->pending) { 551 up->len = 0; 552 up->pending = 0; 553 ip6_flush_pending_frames(sk); 554 } 555 } 556 557 /* 558 * Sending 559 */ 560 561 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up) 562 { 563 struct sk_buff *skb; 564 struct udphdr *uh; 565 struct inet_sock *inet = inet_sk(sk); 566 struct flowi *fl = &inet->cork.fl; 567 int err = 0; 568 569 /* Grab the skbuff where UDP header space exists. */ 570 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 571 goto out; 572 573 /* 574 * Create a UDP header 575 */ 576 uh = skb->h.uh; 577 uh->source = fl->fl_ip_sport; 578 uh->dest = fl->fl_ip_dport; 579 uh->len = htons(up->len); 580 uh->check = 0; 581 582 if (sk->sk_no_check == UDP_CSUM_NOXMIT) { 583 skb->ip_summed = CHECKSUM_NONE; 584 goto send; 585 } 586 587 if (skb_queue_len(&sk->sk_write_queue) == 1) { 588 skb->csum = csum_partial((char *)uh, 589 sizeof(struct udphdr), skb->csum); 590 uh->check = csum_ipv6_magic(&fl->fl6_src, 591 &fl->fl6_dst, 592 up->len, fl->proto, skb->csum); 593 } else { 594 u32 tmp_csum = 0; 595 596 skb_queue_walk(&sk->sk_write_queue, skb) { 597 tmp_csum = csum_add(tmp_csum, skb->csum); 598 } 599 tmp_csum = csum_partial((char *)uh, 600 sizeof(struct udphdr), tmp_csum); 601 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 602 &fl->fl6_dst, 603 up->len, fl->proto, tmp_csum); 604 uh->check = tmp_csum; 605 606 } 607 if (uh->check == 0) 608 uh->check = -1; 609 610 send: 611 err = ip6_push_pending_frames(sk); 612 out: 613 up->len = 0; 614 up->pending = 0; 615 return err; 616 } 617 618 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 619 struct msghdr *msg, size_t len) 620 { 621 struct ipv6_txoptions opt_space; 622 struct udp_sock *up = udp_sk(sk); 623 struct inet_sock *inet = inet_sk(sk); 624 struct ipv6_pinfo *np = inet6_sk(sk); 625 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 626 struct in6_addr *daddr, *final_p = NULL, final; 627 struct ipv6_txoptions *opt = NULL; 628 struct ip6_flowlabel *flowlabel = NULL; 629 struct flowi *fl = &inet->cork.fl; 630 struct dst_entry *dst; 631 int addr_len = msg->msg_namelen; 632 int ulen = len; 633 int hlimit = -1; 634 int tclass = -1; 635 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 636 int err; 637 int connected = 0; 638 639 /* destination address check */ 640 if (sin6) { 641 if (addr_len < offsetof(struct sockaddr, sa_data)) 642 return -EINVAL; 643 644 switch (sin6->sin6_family) { 645 case AF_INET6: 646 if (addr_len < SIN6_LEN_RFC2133) 647 return -EINVAL; 648 daddr = &sin6->sin6_addr; 649 break; 650 case AF_INET: 651 goto do_udp_sendmsg; 652 case AF_UNSPEC: 653 msg->msg_name = sin6 = NULL; 654 msg->msg_namelen = addr_len = 0; 655 daddr = NULL; 656 break; 657 default: 658 return -EINVAL; 659 } 660 } else if (!up->pending) { 661 if (sk->sk_state != TCP_ESTABLISHED) 662 return -EDESTADDRREQ; 663 daddr = &np->daddr; 664 } else 665 daddr = NULL; 666 667 if (daddr) { 668 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 669 struct sockaddr_in sin; 670 sin.sin_family = AF_INET; 671 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 672 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 673 msg->msg_name = &sin; 674 msg->msg_namelen = sizeof(sin); 675 do_udp_sendmsg: 676 if (__ipv6_only_sock(sk)) 677 return -ENETUNREACH; 678 return udp_sendmsg(iocb, sk, msg, len); 679 } 680 } 681 682 if (up->pending == AF_INET) 683 return udp_sendmsg(iocb, sk, msg, len); 684 685 /* Rough check on arithmetic overflow, 686 better check is made in ip6_build_xmit 687 */ 688 if (len > INT_MAX - sizeof(struct udphdr)) 689 return -EMSGSIZE; 690 691 if (up->pending) { 692 /* 693 * There are pending frames. 694 * The socket lock must be held while it's corked. 695 */ 696 lock_sock(sk); 697 if (likely(up->pending)) { 698 if (unlikely(up->pending != AF_INET6)) { 699 release_sock(sk); 700 return -EAFNOSUPPORT; 701 } 702 dst = NULL; 703 goto do_append_data; 704 } 705 release_sock(sk); 706 } 707 ulen += sizeof(struct udphdr); 708 709 memset(fl, 0, sizeof(*fl)); 710 711 if (sin6) { 712 if (sin6->sin6_port == 0) 713 return -EINVAL; 714 715 fl->fl_ip_dport = sin6->sin6_port; 716 daddr = &sin6->sin6_addr; 717 718 if (np->sndflow) { 719 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 720 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 721 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 722 if (flowlabel == NULL) 723 return -EINVAL; 724 daddr = &flowlabel->dst; 725 } 726 } 727 728 /* 729 * Otherwise it will be difficult to maintain 730 * sk->sk_dst_cache. 731 */ 732 if (sk->sk_state == TCP_ESTABLISHED && 733 ipv6_addr_equal(daddr, &np->daddr)) 734 daddr = &np->daddr; 735 736 if (addr_len >= sizeof(struct sockaddr_in6) && 737 sin6->sin6_scope_id && 738 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 739 fl->oif = sin6->sin6_scope_id; 740 } else { 741 if (sk->sk_state != TCP_ESTABLISHED) 742 return -EDESTADDRREQ; 743 744 fl->fl_ip_dport = inet->dport; 745 daddr = &np->daddr; 746 fl->fl6_flowlabel = np->flow_label; 747 connected = 1; 748 } 749 750 if (!fl->oif) 751 fl->oif = sk->sk_bound_dev_if; 752 753 if (msg->msg_controllen) { 754 opt = &opt_space; 755 memset(opt, 0, sizeof(struct ipv6_txoptions)); 756 opt->tot_len = sizeof(*opt); 757 758 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass); 759 if (err < 0) { 760 fl6_sock_release(flowlabel); 761 return err; 762 } 763 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 764 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 765 if (flowlabel == NULL) 766 return -EINVAL; 767 } 768 if (!(opt->opt_nflen|opt->opt_flen)) 769 opt = NULL; 770 connected = 0; 771 } 772 if (opt == NULL) 773 opt = np->opt; 774 if (flowlabel) 775 opt = fl6_merge_options(&opt_space, flowlabel, opt); 776 opt = ipv6_fixup_options(&opt_space, opt); 777 778 fl->proto = IPPROTO_UDP; 779 ipv6_addr_copy(&fl->fl6_dst, daddr); 780 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr)) 781 ipv6_addr_copy(&fl->fl6_src, &np->saddr); 782 fl->fl_ip_sport = inet->sport; 783 784 /* merge ip6_build_xmit from ip6_output */ 785 if (opt && opt->srcrt) { 786 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 787 ipv6_addr_copy(&final, &fl->fl6_dst); 788 ipv6_addr_copy(&fl->fl6_dst, rt0->addr); 789 final_p = &final; 790 connected = 0; 791 } 792 793 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) { 794 fl->oif = np->mcast_oif; 795 connected = 0; 796 } 797 798 err = ip6_dst_lookup(sk, &dst, fl); 799 if (err) 800 goto out; 801 if (final_p) 802 ipv6_addr_copy(&fl->fl6_dst, final_p); 803 804 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) 805 goto out; 806 807 if (hlimit < 0) { 808 if (ipv6_addr_is_multicast(&fl->fl6_dst)) 809 hlimit = np->mcast_hops; 810 else 811 hlimit = np->hop_limit; 812 if (hlimit < 0) 813 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 814 if (hlimit < 0) 815 hlimit = ipv6_get_hoplimit(dst->dev); 816 } 817 818 if (tclass < 0) { 819 tclass = np->tclass; 820 if (tclass < 0) 821 tclass = 0; 822 } 823 824 if (msg->msg_flags&MSG_CONFIRM) 825 goto do_confirm; 826 back_from_confirm: 827 828 lock_sock(sk); 829 if (unlikely(up->pending)) { 830 /* The socket is already corked while preparing it. */ 831 /* ... which is an evident application bug. --ANK */ 832 release_sock(sk); 833 834 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 835 err = -EINVAL; 836 goto out; 837 } 838 839 up->pending = AF_INET6; 840 841 do_append_data: 842 up->len += ulen; 843 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, 844 sizeof(struct udphdr), hlimit, tclass, opt, fl, 845 (struct rt6_info*)dst, 846 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 847 if (err) 848 udp_v6_flush_pending_frames(sk); 849 else if (!corkreq) 850 err = udp_v6_push_pending_frames(sk, up); 851 852 if (dst) { 853 if (connected) { 854 ip6_dst_store(sk, dst, 855 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ? 856 &np->daddr : NULL); 857 } else { 858 dst_release(dst); 859 } 860 } 861 862 if (err > 0) 863 err = np->recverr ? net_xmit_errno(err) : 0; 864 release_sock(sk); 865 out: 866 fl6_sock_release(flowlabel); 867 if (!err) { 868 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS); 869 return len; 870 } 871 return err; 872 873 do_confirm: 874 dst_confirm(dst); 875 if (!(msg->msg_flags&MSG_PROBE) || len) 876 goto back_from_confirm; 877 err = 0; 878 goto out; 879 } 880 881 static int udpv6_destroy_sock(struct sock *sk) 882 { 883 lock_sock(sk); 884 udp_v6_flush_pending_frames(sk); 885 release_sock(sk); 886 887 inet6_destroy_sock(sk); 888 889 return 0; 890 } 891 892 /* 893 * Socket option code for UDP 894 */ 895 static int udpv6_setsockopt(struct sock *sk, int level, int optname, 896 char __user *optval, int optlen) 897 { 898 struct udp_sock *up = udp_sk(sk); 899 int val; 900 int err = 0; 901 902 if (level != SOL_UDP) 903 return ipv6_setsockopt(sk, level, optname, optval, optlen); 904 905 if(optlen<sizeof(int)) 906 return -EINVAL; 907 908 if (get_user(val, (int __user *)optval)) 909 return -EFAULT; 910 911 switch(optname) { 912 case UDP_CORK: 913 if (val != 0) { 914 up->corkflag = 1; 915 } else { 916 up->corkflag = 0; 917 lock_sock(sk); 918 udp_v6_push_pending_frames(sk, up); 919 release_sock(sk); 920 } 921 break; 922 923 case UDP_ENCAP: 924 switch (val) { 925 case 0: 926 up->encap_type = val; 927 break; 928 default: 929 err = -ENOPROTOOPT; 930 break; 931 } 932 break; 933 934 default: 935 err = -ENOPROTOOPT; 936 break; 937 }; 938 939 return err; 940 } 941 942 static int udpv6_getsockopt(struct sock *sk, int level, int optname, 943 char __user *optval, int __user *optlen) 944 { 945 struct udp_sock *up = udp_sk(sk); 946 int val, len; 947 948 if (level != SOL_UDP) 949 return ipv6_getsockopt(sk, level, optname, optval, optlen); 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 struct inet6_protocol udpv6_protocol = { 980 .handler = udpv6_rcv, 981 .err_handler = udpv6_err, 982 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 983 }; 984 985 /* ------------------------------------------------------------------------ */ 986 #ifdef CONFIG_PROC_FS 987 988 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 989 { 990 struct inet_sock *inet = inet_sk(sp); 991 struct ipv6_pinfo *np = inet6_sk(sp); 992 struct in6_addr *dest, *src; 993 __u16 destp, srcp; 994 995 dest = &np->daddr; 996 src = &np->rcv_saddr; 997 destp = ntohs(inet->dport); 998 srcp = ntohs(inet->sport); 999 seq_printf(seq, 1000 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1001 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1002 bucket, 1003 src->s6_addr32[0], src->s6_addr32[1], 1004 src->s6_addr32[2], src->s6_addr32[3], srcp, 1005 dest->s6_addr32[0], dest->s6_addr32[1], 1006 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1007 sp->sk_state, 1008 atomic_read(&sp->sk_wmem_alloc), 1009 atomic_read(&sp->sk_rmem_alloc), 1010 0, 0L, 0, 1011 sock_i_uid(sp), 0, 1012 sock_i_ino(sp), 1013 atomic_read(&sp->sk_refcnt), sp); 1014 } 1015 1016 static int udp6_seq_show(struct seq_file *seq, void *v) 1017 { 1018 if (v == SEQ_START_TOKEN) 1019 seq_printf(seq, 1020 " sl " 1021 "local_address " 1022 "remote_address " 1023 "st tx_queue rx_queue tr tm->when retrnsmt" 1024 " uid timeout inode\n"); 1025 else 1026 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1027 return 0; 1028 } 1029 1030 static struct file_operations udp6_seq_fops; 1031 static struct udp_seq_afinfo udp6_seq_afinfo = { 1032 .owner = THIS_MODULE, 1033 .name = "udp6", 1034 .family = AF_INET6, 1035 .seq_show = udp6_seq_show, 1036 .seq_fops = &udp6_seq_fops, 1037 }; 1038 1039 int __init udp6_proc_init(void) 1040 { 1041 return udp_proc_register(&udp6_seq_afinfo); 1042 } 1043 1044 void udp6_proc_exit(void) { 1045 udp_proc_unregister(&udp6_seq_afinfo); 1046 } 1047 #endif /* CONFIG_PROC_FS */ 1048 1049 /* ------------------------------------------------------------------------ */ 1050 1051 struct proto udpv6_prot = { 1052 .name = "UDPv6", 1053 .owner = THIS_MODULE, 1054 .close = udpv6_close, 1055 .connect = ip6_datagram_connect, 1056 .disconnect = udp_disconnect, 1057 .ioctl = udp_ioctl, 1058 .destroy = udpv6_destroy_sock, 1059 .setsockopt = udpv6_setsockopt, 1060 .getsockopt = udpv6_getsockopt, 1061 .sendmsg = udpv6_sendmsg, 1062 .recvmsg = udpv6_recvmsg, 1063 .backlog_rcv = udpv6_queue_rcv_skb, 1064 .hash = udp_v6_hash, 1065 .unhash = udp_v6_unhash, 1066 .get_port = udp_v6_get_port, 1067 .obj_size = sizeof(struct udp6_sock), 1068 }; 1069 1070 static struct inet_protosw udpv6_protosw = { 1071 .type = SOCK_DGRAM, 1072 .protocol = IPPROTO_UDP, 1073 .prot = &udpv6_prot, 1074 .ops = &inet6_dgram_ops, 1075 .capability =-1, 1076 .no_check = UDP_CSUM_DEFAULT, 1077 .flags = INET_PROTOSW_PERMANENT, 1078 }; 1079 1080 1081 void __init udpv6_init(void) 1082 { 1083 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1084 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1085 inet6_register_protosw(&udpv6_protosw); 1086 } 1087