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 int rc; 349 350 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 351 kfree_skb(skb); 352 return -1; 353 } 354 355 if (skb_checksum_complete(skb)) { 356 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 357 kfree_skb(skb); 358 return 0; 359 } 360 361 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 362 /* Note that an ENOMEM error is charged twice */ 363 if (rc == -ENOMEM) 364 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS); 365 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 366 kfree_skb(skb); 367 return 0; 368 } 369 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS); 370 return 0; 371 } 372 373 static struct sock *udp_v6_mcast_next(struct sock *sk, 374 u16 loc_port, struct in6_addr *loc_addr, 375 u16 rmt_port, struct in6_addr *rmt_addr, 376 int dif) 377 { 378 struct hlist_node *node; 379 struct sock *s = sk; 380 unsigned short num = ntohs(loc_port); 381 382 sk_for_each_from(s, node) { 383 struct inet_sock *inet = inet_sk(s); 384 385 if (inet->num == num && s->sk_family == PF_INET6) { 386 struct ipv6_pinfo *np = inet6_sk(s); 387 if (inet->dport) { 388 if (inet->dport != rmt_port) 389 continue; 390 } 391 if (!ipv6_addr_any(&np->daddr) && 392 !ipv6_addr_equal(&np->daddr, rmt_addr)) 393 continue; 394 395 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 396 continue; 397 398 if (!ipv6_addr_any(&np->rcv_saddr)) { 399 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 400 continue; 401 } 402 if(!inet6_mc_check(s, loc_addr, rmt_addr)) 403 continue; 404 return s; 405 } 406 } 407 return NULL; 408 } 409 410 /* 411 * Note: called only from the BH handler context, 412 * so we don't need to lock the hashes. 413 */ 414 static void udpv6_mcast_deliver(struct udphdr *uh, 415 struct in6_addr *saddr, struct in6_addr *daddr, 416 struct sk_buff *skb) 417 { 418 struct sock *sk, *sk2; 419 int dif; 420 421 read_lock(&udp_hash_lock); 422 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 423 dif = skb->dev->ifindex; 424 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 425 if (!sk) { 426 kfree_skb(skb); 427 goto out; 428 } 429 430 sk2 = sk; 431 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 432 uh->source, saddr, dif))) { 433 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 434 if (buff) 435 udpv6_queue_rcv_skb(sk2, buff); 436 } 437 udpv6_queue_rcv_skb(sk, skb); 438 out: 439 read_unlock(&udp_hash_lock); 440 } 441 442 static int udpv6_rcv(struct sk_buff **pskb) 443 { 444 struct sk_buff *skb = *pskb; 445 struct sock *sk; 446 struct udphdr *uh; 447 struct net_device *dev = skb->dev; 448 struct in6_addr *saddr, *daddr; 449 u32 ulen = 0; 450 451 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 452 goto short_packet; 453 454 saddr = &skb->nh.ipv6h->saddr; 455 daddr = &skb->nh.ipv6h->daddr; 456 uh = skb->h.uh; 457 458 ulen = ntohs(uh->len); 459 460 /* Check for jumbo payload */ 461 if (ulen == 0) 462 ulen = skb->len; 463 464 if (ulen > skb->len || ulen < sizeof(*uh)) 465 goto short_packet; 466 467 if (uh->check == 0) { 468 /* RFC 2460 section 8.1 says that we SHOULD log 469 this error. Well, it is reasonable. 470 */ 471 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 472 goto discard; 473 } 474 475 if (ulen < skb->len) { 476 if (pskb_trim_rcsum(skb, ulen)) 477 goto discard; 478 saddr = &skb->nh.ipv6h->saddr; 479 daddr = &skb->nh.ipv6h->daddr; 480 uh = skb->h.uh; 481 } 482 483 if (skb->ip_summed == CHECKSUM_COMPLETE && 484 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) 485 skb->ip_summed = CHECKSUM_UNNECESSARY; 486 487 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 488 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0); 489 490 /* 491 * Multicast receive code 492 */ 493 if (ipv6_addr_is_multicast(daddr)) { 494 udpv6_mcast_deliver(uh, saddr, daddr, skb); 495 return 0; 496 } 497 498 /* Unicast */ 499 500 /* 501 * check socket cache ... must talk to Alan about his plans 502 * for sock caches... i'll skip this for now. 503 */ 504 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex); 505 506 if (sk == NULL) { 507 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 508 goto discard; 509 510 if (skb_checksum_complete(skb)) 511 goto discard; 512 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS); 513 514 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 515 516 kfree_skb(skb); 517 return(0); 518 } 519 520 /* deliver */ 521 522 udpv6_queue_rcv_skb(sk, skb); 523 sock_put(sk); 524 return(0); 525 526 short_packet: 527 if (net_ratelimit()) 528 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len); 529 530 discard: 531 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 532 kfree_skb(skb); 533 return(0); 534 } 535 /* 536 * Throw away all pending data and cancel the corking. Socket is locked. 537 */ 538 static void udp_v6_flush_pending_frames(struct sock *sk) 539 { 540 struct udp_sock *up = udp_sk(sk); 541 542 if (up->pending) { 543 up->len = 0; 544 up->pending = 0; 545 ip6_flush_pending_frames(sk); 546 } 547 } 548 549 /* 550 * Sending 551 */ 552 553 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up) 554 { 555 struct sk_buff *skb; 556 struct udphdr *uh; 557 struct inet_sock *inet = inet_sk(sk); 558 struct flowi *fl = &inet->cork.fl; 559 int err = 0; 560 561 /* Grab the skbuff where UDP header space exists. */ 562 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 563 goto out; 564 565 /* 566 * Create a UDP header 567 */ 568 uh = skb->h.uh; 569 uh->source = fl->fl_ip_sport; 570 uh->dest = fl->fl_ip_dport; 571 uh->len = htons(up->len); 572 uh->check = 0; 573 574 if (sk->sk_no_check == UDP_CSUM_NOXMIT) { 575 skb->ip_summed = CHECKSUM_NONE; 576 goto send; 577 } 578 579 if (skb_queue_len(&sk->sk_write_queue) == 1) { 580 skb->csum = csum_partial((char *)uh, 581 sizeof(struct udphdr), skb->csum); 582 uh->check = csum_ipv6_magic(&fl->fl6_src, 583 &fl->fl6_dst, 584 up->len, fl->proto, skb->csum); 585 } else { 586 u32 tmp_csum = 0; 587 588 skb_queue_walk(&sk->sk_write_queue, skb) { 589 tmp_csum = csum_add(tmp_csum, skb->csum); 590 } 591 tmp_csum = csum_partial((char *)uh, 592 sizeof(struct udphdr), tmp_csum); 593 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 594 &fl->fl6_dst, 595 up->len, fl->proto, tmp_csum); 596 uh->check = tmp_csum; 597 598 } 599 if (uh->check == 0) 600 uh->check = -1; 601 602 send: 603 err = ip6_push_pending_frames(sk); 604 out: 605 up->len = 0; 606 up->pending = 0; 607 return err; 608 } 609 610 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 611 struct msghdr *msg, size_t len) 612 { 613 struct ipv6_txoptions opt_space; 614 struct udp_sock *up = udp_sk(sk); 615 struct inet_sock *inet = inet_sk(sk); 616 struct ipv6_pinfo *np = inet6_sk(sk); 617 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 618 struct in6_addr *daddr, *final_p = NULL, final; 619 struct ipv6_txoptions *opt = NULL; 620 struct ip6_flowlabel *flowlabel = NULL; 621 struct flowi *fl = &inet->cork.fl; 622 struct dst_entry *dst; 623 int addr_len = msg->msg_namelen; 624 int ulen = len; 625 int hlimit = -1; 626 int tclass = -1; 627 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 628 int err; 629 int connected = 0; 630 631 /* destination address check */ 632 if (sin6) { 633 if (addr_len < offsetof(struct sockaddr, sa_data)) 634 return -EINVAL; 635 636 switch (sin6->sin6_family) { 637 case AF_INET6: 638 if (addr_len < SIN6_LEN_RFC2133) 639 return -EINVAL; 640 daddr = &sin6->sin6_addr; 641 break; 642 case AF_INET: 643 goto do_udp_sendmsg; 644 case AF_UNSPEC: 645 msg->msg_name = sin6 = NULL; 646 msg->msg_namelen = addr_len = 0; 647 daddr = NULL; 648 break; 649 default: 650 return -EINVAL; 651 } 652 } else if (!up->pending) { 653 if (sk->sk_state != TCP_ESTABLISHED) 654 return -EDESTADDRREQ; 655 daddr = &np->daddr; 656 } else 657 daddr = NULL; 658 659 if (daddr) { 660 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 661 struct sockaddr_in sin; 662 sin.sin_family = AF_INET; 663 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 664 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 665 msg->msg_name = &sin; 666 msg->msg_namelen = sizeof(sin); 667 do_udp_sendmsg: 668 if (__ipv6_only_sock(sk)) 669 return -ENETUNREACH; 670 return udp_sendmsg(iocb, sk, msg, len); 671 } 672 } 673 674 if (up->pending == AF_INET) 675 return udp_sendmsg(iocb, sk, msg, len); 676 677 /* Rough check on arithmetic overflow, 678 better check is made in ip6_build_xmit 679 */ 680 if (len > INT_MAX - sizeof(struct udphdr)) 681 return -EMSGSIZE; 682 683 if (up->pending) { 684 /* 685 * There are pending frames. 686 * The socket lock must be held while it's corked. 687 */ 688 lock_sock(sk); 689 if (likely(up->pending)) { 690 if (unlikely(up->pending != AF_INET6)) { 691 release_sock(sk); 692 return -EAFNOSUPPORT; 693 } 694 dst = NULL; 695 goto do_append_data; 696 } 697 release_sock(sk); 698 } 699 ulen += sizeof(struct udphdr); 700 701 memset(fl, 0, sizeof(*fl)); 702 703 if (sin6) { 704 if (sin6->sin6_port == 0) 705 return -EINVAL; 706 707 fl->fl_ip_dport = sin6->sin6_port; 708 daddr = &sin6->sin6_addr; 709 710 if (np->sndflow) { 711 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 712 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 713 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 714 if (flowlabel == NULL) 715 return -EINVAL; 716 daddr = &flowlabel->dst; 717 } 718 } 719 720 /* 721 * Otherwise it will be difficult to maintain 722 * sk->sk_dst_cache. 723 */ 724 if (sk->sk_state == TCP_ESTABLISHED && 725 ipv6_addr_equal(daddr, &np->daddr)) 726 daddr = &np->daddr; 727 728 if (addr_len >= sizeof(struct sockaddr_in6) && 729 sin6->sin6_scope_id && 730 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 731 fl->oif = sin6->sin6_scope_id; 732 } else { 733 if (sk->sk_state != TCP_ESTABLISHED) 734 return -EDESTADDRREQ; 735 736 fl->fl_ip_dport = inet->dport; 737 daddr = &np->daddr; 738 fl->fl6_flowlabel = np->flow_label; 739 connected = 1; 740 } 741 742 if (!fl->oif) 743 fl->oif = sk->sk_bound_dev_if; 744 745 if (msg->msg_controllen) { 746 opt = &opt_space; 747 memset(opt, 0, sizeof(struct ipv6_txoptions)); 748 opt->tot_len = sizeof(*opt); 749 750 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass); 751 if (err < 0) { 752 fl6_sock_release(flowlabel); 753 return err; 754 } 755 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 756 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 757 if (flowlabel == NULL) 758 return -EINVAL; 759 } 760 if (!(opt->opt_nflen|opt->opt_flen)) 761 opt = NULL; 762 connected = 0; 763 } 764 if (opt == NULL) 765 opt = np->opt; 766 if (flowlabel) 767 opt = fl6_merge_options(&opt_space, flowlabel, opt); 768 opt = ipv6_fixup_options(&opt_space, opt); 769 770 fl->proto = IPPROTO_UDP; 771 ipv6_addr_copy(&fl->fl6_dst, daddr); 772 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr)) 773 ipv6_addr_copy(&fl->fl6_src, &np->saddr); 774 fl->fl_ip_sport = inet->sport; 775 776 /* merge ip6_build_xmit from ip6_output */ 777 if (opt && opt->srcrt) { 778 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 779 ipv6_addr_copy(&final, &fl->fl6_dst); 780 ipv6_addr_copy(&fl->fl6_dst, rt0->addr); 781 final_p = &final; 782 connected = 0; 783 } 784 785 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) { 786 fl->oif = np->mcast_oif; 787 connected = 0; 788 } 789 790 security_sk_classify_flow(sk, fl); 791 792 err = ip6_sk_dst_lookup(sk, &dst, fl); 793 if (err) 794 goto out; 795 if (final_p) 796 ipv6_addr_copy(&fl->fl6_dst, final_p); 797 798 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) 799 goto out; 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 = dst_metric(dst, RTAX_HOPLIMIT); 808 if (hlimit < 0) 809 hlimit = ipv6_get_hoplimit(dst->dev); 810 } 811 812 if (tclass < 0) { 813 tclass = np->tclass; 814 if (tclass < 0) 815 tclass = 0; 816 } 817 818 if (msg->msg_flags&MSG_CONFIRM) 819 goto do_confirm; 820 back_from_confirm: 821 822 lock_sock(sk); 823 if (unlikely(up->pending)) { 824 /* The socket is already corked while preparing it. */ 825 /* ... which is an evident application bug. --ANK */ 826 release_sock(sk); 827 828 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 829 err = -EINVAL; 830 goto out; 831 } 832 833 up->pending = AF_INET6; 834 835 do_append_data: 836 up->len += ulen; 837 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, 838 sizeof(struct udphdr), hlimit, tclass, opt, fl, 839 (struct rt6_info*)dst, 840 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 841 if (err) 842 udp_v6_flush_pending_frames(sk); 843 else if (!corkreq) 844 err = udp_v6_push_pending_frames(sk, up); 845 846 if (dst) { 847 if (connected) { 848 ip6_dst_store(sk, dst, 849 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ? 850 &np->daddr : NULL); 851 } else { 852 dst_release(dst); 853 } 854 } 855 856 if (err > 0) 857 err = np->recverr ? net_xmit_errno(err) : 0; 858 release_sock(sk); 859 out: 860 fl6_sock_release(flowlabel); 861 if (!err) { 862 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS); 863 return len; 864 } 865 /* 866 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 867 * ENOBUFS might not be good (it's not tunable per se), but otherwise 868 * we don't have a good statistic (IpOutDiscards but it can be too many 869 * things). We could add another new stat but at least for now that 870 * seems like overkill. 871 */ 872 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 873 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS); 874 } 875 return err; 876 877 do_confirm: 878 dst_confirm(dst); 879 if (!(msg->msg_flags&MSG_PROBE) || len) 880 goto back_from_confirm; 881 err = 0; 882 goto out; 883 } 884 885 static int udpv6_destroy_sock(struct sock *sk) 886 { 887 lock_sock(sk); 888 udp_v6_flush_pending_frames(sk); 889 release_sock(sk); 890 891 inet6_destroy_sock(sk); 892 893 return 0; 894 } 895 896 /* 897 * Socket option code for UDP 898 */ 899 static int do_udpv6_setsockopt(struct sock *sk, int level, int optname, 900 char __user *optval, int optlen) 901 { 902 struct udp_sock *up = udp_sk(sk); 903 int val; 904 int err = 0; 905 906 if(optlen<sizeof(int)) 907 return -EINVAL; 908 909 if (get_user(val, (int __user *)optval)) 910 return -EFAULT; 911 912 switch(optname) { 913 case UDP_CORK: 914 if (val != 0) { 915 up->corkflag = 1; 916 } else { 917 up->corkflag = 0; 918 lock_sock(sk); 919 udp_v6_push_pending_frames(sk, up); 920 release_sock(sk); 921 } 922 break; 923 924 case UDP_ENCAP: 925 switch (val) { 926 case 0: 927 up->encap_type = val; 928 break; 929 default: 930 err = -ENOPROTOOPT; 931 break; 932 } 933 break; 934 935 default: 936 err = -ENOPROTOOPT; 937 break; 938 }; 939 940 return err; 941 } 942 943 static int udpv6_setsockopt(struct sock *sk, int level, int optname, 944 char __user *optval, int optlen) 945 { 946 if (level != SOL_UDP) 947 return ipv6_setsockopt(sk, level, optname, optval, optlen); 948 return do_udpv6_setsockopt(sk, level, optname, optval, optlen); 949 } 950 951 #ifdef CONFIG_COMPAT 952 static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 953 char __user *optval, int optlen) 954 { 955 if (level != SOL_UDP) 956 return compat_ipv6_setsockopt(sk, level, optname, 957 optval, optlen); 958 return do_udpv6_setsockopt(sk, level, optname, optval, optlen); 959 } 960 #endif 961 962 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname, 963 char __user *optval, int __user *optlen) 964 { 965 struct udp_sock *up = udp_sk(sk); 966 int val, len; 967 968 if(get_user(len,optlen)) 969 return -EFAULT; 970 971 len = min_t(unsigned int, len, sizeof(int)); 972 973 if(len < 0) 974 return -EINVAL; 975 976 switch(optname) { 977 case UDP_CORK: 978 val = up->corkflag; 979 break; 980 981 case UDP_ENCAP: 982 val = up->encap_type; 983 break; 984 985 default: 986 return -ENOPROTOOPT; 987 }; 988 989 if(put_user(len, optlen)) 990 return -EFAULT; 991 if(copy_to_user(optval, &val,len)) 992 return -EFAULT; 993 return 0; 994 } 995 996 static int udpv6_getsockopt(struct sock *sk, int level, int optname, 997 char __user *optval, int __user *optlen) 998 { 999 if (level != SOL_UDP) 1000 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1001 return do_udpv6_getsockopt(sk, level, optname, optval, optlen); 1002 } 1003 1004 #ifdef CONFIG_COMPAT 1005 static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1006 char __user *optval, int __user *optlen) 1007 { 1008 if (level != SOL_UDP) 1009 return compat_ipv6_getsockopt(sk, level, optname, 1010 optval, optlen); 1011 return do_udpv6_getsockopt(sk, level, optname, optval, optlen); 1012 } 1013 #endif 1014 1015 static struct inet6_protocol udpv6_protocol = { 1016 .handler = udpv6_rcv, 1017 .err_handler = udpv6_err, 1018 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1019 }; 1020 1021 /* ------------------------------------------------------------------------ */ 1022 #ifdef CONFIG_PROC_FS 1023 1024 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1025 { 1026 struct inet_sock *inet = inet_sk(sp); 1027 struct ipv6_pinfo *np = inet6_sk(sp); 1028 struct in6_addr *dest, *src; 1029 __u16 destp, srcp; 1030 1031 dest = &np->daddr; 1032 src = &np->rcv_saddr; 1033 destp = ntohs(inet->dport); 1034 srcp = ntohs(inet->sport); 1035 seq_printf(seq, 1036 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1037 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1038 bucket, 1039 src->s6_addr32[0], src->s6_addr32[1], 1040 src->s6_addr32[2], src->s6_addr32[3], srcp, 1041 dest->s6_addr32[0], dest->s6_addr32[1], 1042 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1043 sp->sk_state, 1044 atomic_read(&sp->sk_wmem_alloc), 1045 atomic_read(&sp->sk_rmem_alloc), 1046 0, 0L, 0, 1047 sock_i_uid(sp), 0, 1048 sock_i_ino(sp), 1049 atomic_read(&sp->sk_refcnt), sp); 1050 } 1051 1052 static int udp6_seq_show(struct seq_file *seq, void *v) 1053 { 1054 if (v == SEQ_START_TOKEN) 1055 seq_printf(seq, 1056 " sl " 1057 "local_address " 1058 "remote_address " 1059 "st tx_queue rx_queue tr tm->when retrnsmt" 1060 " uid timeout inode\n"); 1061 else 1062 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1063 return 0; 1064 } 1065 1066 static struct file_operations udp6_seq_fops; 1067 static struct udp_seq_afinfo udp6_seq_afinfo = { 1068 .owner = THIS_MODULE, 1069 .name = "udp6", 1070 .family = AF_INET6, 1071 .seq_show = udp6_seq_show, 1072 .seq_fops = &udp6_seq_fops, 1073 }; 1074 1075 int __init udp6_proc_init(void) 1076 { 1077 return udp_proc_register(&udp6_seq_afinfo); 1078 } 1079 1080 void udp6_proc_exit(void) { 1081 udp_proc_unregister(&udp6_seq_afinfo); 1082 } 1083 #endif /* CONFIG_PROC_FS */ 1084 1085 /* ------------------------------------------------------------------------ */ 1086 1087 struct proto udpv6_prot = { 1088 .name = "UDPv6", 1089 .owner = THIS_MODULE, 1090 .close = udpv6_close, 1091 .connect = ip6_datagram_connect, 1092 .disconnect = udp_disconnect, 1093 .ioctl = udp_ioctl, 1094 .destroy = udpv6_destroy_sock, 1095 .setsockopt = udpv6_setsockopt, 1096 .getsockopt = udpv6_getsockopt, 1097 .sendmsg = udpv6_sendmsg, 1098 .recvmsg = udpv6_recvmsg, 1099 .backlog_rcv = udpv6_queue_rcv_skb, 1100 .hash = udp_v6_hash, 1101 .unhash = udp_v6_unhash, 1102 .get_port = udp_v6_get_port, 1103 .obj_size = sizeof(struct udp6_sock), 1104 #ifdef CONFIG_COMPAT 1105 .compat_setsockopt = compat_udpv6_setsockopt, 1106 .compat_getsockopt = compat_udpv6_getsockopt, 1107 #endif 1108 }; 1109 1110 static struct inet_protosw udpv6_protosw = { 1111 .type = SOCK_DGRAM, 1112 .protocol = IPPROTO_UDP, 1113 .prot = &udpv6_prot, 1114 .ops = &inet6_dgram_ops, 1115 .capability =-1, 1116 .no_check = UDP_CSUM_DEFAULT, 1117 .flags = INET_PROTOSW_PERMANENT, 1118 }; 1119 1120 1121 void __init udpv6_init(void) 1122 { 1123 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1124 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1125 inet6_register_protosw(&udpv6_protosw); 1126 } 1127