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 55 #include <net/ip6_checksum.h> 56 #include <net/xfrm.h> 57 58 #include <linux/proc_fs.h> 59 #include <linux/seq_file.h> 60 61 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6); 62 63 /* Grrr, addr_type already calculated by caller, but I don't want 64 * to add some silly "cookie" argument to this method just for that. 65 */ 66 static int udp_v6_get_port(struct sock *sk, unsigned short snum) 67 { 68 struct sock *sk2; 69 struct hlist_node *node; 70 71 write_lock_bh(&udp_hash_lock); 72 if (snum == 0) { 73 int best_size_so_far, best, result, i; 74 75 if (udp_port_rover > sysctl_local_port_range[1] || 76 udp_port_rover < sysctl_local_port_range[0]) 77 udp_port_rover = sysctl_local_port_range[0]; 78 best_size_so_far = 32767; 79 best = result = udp_port_rover; 80 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) { 81 int size; 82 struct hlist_head *list; 83 84 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)]; 85 if (hlist_empty(list)) { 86 if (result > sysctl_local_port_range[1]) 87 result = sysctl_local_port_range[0] + 88 ((result - sysctl_local_port_range[0]) & 89 (UDP_HTABLE_SIZE - 1)); 90 goto gotit; 91 } 92 size = 0; 93 sk_for_each(sk2, node, list) 94 if (++size >= best_size_so_far) 95 goto next; 96 best_size_so_far = size; 97 best = result; 98 next:; 99 } 100 result = best; 101 for(;; result += UDP_HTABLE_SIZE) { 102 if (result > sysctl_local_port_range[1]) 103 result = sysctl_local_port_range[0] 104 + ((result - sysctl_local_port_range[0]) & 105 (UDP_HTABLE_SIZE - 1)); 106 if (!udp_lport_inuse(result)) 107 break; 108 } 109 gotit: 110 udp_port_rover = snum = result; 111 } else { 112 sk_for_each(sk2, node, 113 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) { 114 if (inet_sk(sk2)->num == snum && 115 sk2 != sk && 116 (!sk2->sk_bound_dev_if || 117 !sk->sk_bound_dev_if || 118 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && 119 (!sk2->sk_reuse || !sk->sk_reuse) && 120 ipv6_rcv_saddr_equal(sk, sk2)) 121 goto fail; 122 } 123 } 124 125 inet_sk(sk)->num = snum; 126 if (sk_unhashed(sk)) { 127 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]); 128 sock_prot_inc_use(sk->sk_prot); 129 } 130 write_unlock_bh(&udp_hash_lock); 131 return 0; 132 133 fail: 134 write_unlock_bh(&udp_hash_lock); 135 return 1; 136 } 137 138 static void udp_v6_hash(struct sock *sk) 139 { 140 BUG(); 141 } 142 143 static void udp_v6_unhash(struct sock *sk) 144 { 145 write_lock_bh(&udp_hash_lock); 146 if (sk_del_node_init(sk)) { 147 inet_sk(sk)->num = 0; 148 sock_prot_dec_use(sk->sk_prot); 149 } 150 write_unlock_bh(&udp_hash_lock); 151 } 152 153 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport, 154 struct in6_addr *daddr, u16 dport, int dif) 155 { 156 struct sock *sk, *result = NULL; 157 struct hlist_node *node; 158 unsigned short hnum = ntohs(dport); 159 int badness = -1; 160 161 read_lock(&udp_hash_lock); 162 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) { 163 struct inet_sock *inet = inet_sk(sk); 164 165 if (inet->num == hnum && sk->sk_family == PF_INET6) { 166 struct ipv6_pinfo *np = inet6_sk(sk); 167 int score = 0; 168 if (inet->dport) { 169 if (inet->dport != sport) 170 continue; 171 score++; 172 } 173 if (!ipv6_addr_any(&np->rcv_saddr)) { 174 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 175 continue; 176 score++; 177 } 178 if (!ipv6_addr_any(&np->daddr)) { 179 if (!ipv6_addr_equal(&np->daddr, saddr)) 180 continue; 181 score++; 182 } 183 if (sk->sk_bound_dev_if) { 184 if (sk->sk_bound_dev_if != dif) 185 continue; 186 score++; 187 } 188 if(score == 4) { 189 result = sk; 190 break; 191 } else if(score > badness) { 192 result = sk; 193 badness = score; 194 } 195 } 196 } 197 if (result) 198 sock_hold(result); 199 read_unlock(&udp_hash_lock); 200 return result; 201 } 202 203 /* 204 * 205 */ 206 207 static void udpv6_close(struct sock *sk, long timeout) 208 { 209 sk_common_release(sk); 210 } 211 212 /* 213 * This should be easy, if there is something there we 214 * return it, otherwise we block. 215 */ 216 217 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 218 struct msghdr *msg, size_t len, 219 int noblock, int flags, int *addr_len) 220 { 221 struct ipv6_pinfo *np = inet6_sk(sk); 222 struct inet_sock *inet = inet_sk(sk); 223 struct sk_buff *skb; 224 size_t copied; 225 int err; 226 227 if (addr_len) 228 *addr_len=sizeof(struct sockaddr_in6); 229 230 if (flags & MSG_ERRQUEUE) 231 return ipv6_recv_error(sk, msg, len); 232 233 try_again: 234 skb = skb_recv_datagram(sk, flags, noblock, &err); 235 if (!skb) 236 goto out; 237 238 copied = skb->len - sizeof(struct udphdr); 239 if (copied > len) { 240 copied = len; 241 msg->msg_flags |= MSG_TRUNC; 242 } 243 244 if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 245 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 246 copied); 247 } else if (msg->msg_flags&MSG_TRUNC) { 248 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) 249 goto csum_copy_err; 250 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, 251 copied); 252 } else { 253 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 254 if (err == -EINVAL) 255 goto csum_copy_err; 256 } 257 if (err) 258 goto out_free; 259 260 sock_recv_timestamp(msg, sk, skb); 261 262 /* Copy the address. */ 263 if (msg->msg_name) { 264 struct sockaddr_in6 *sin6; 265 266 sin6 = (struct sockaddr_in6 *) msg->msg_name; 267 sin6->sin6_family = AF_INET6; 268 sin6->sin6_port = skb->h.uh->source; 269 sin6->sin6_flowinfo = 0; 270 sin6->sin6_scope_id = 0; 271 272 if (skb->protocol == htons(ETH_P_IP)) 273 ipv6_addr_set(&sin6->sin6_addr, 0, 0, 274 htonl(0xffff), skb->nh.iph->saddr); 275 else { 276 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 277 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 278 sin6->sin6_scope_id = IP6CB(skb)->iif; 279 } 280 281 } 282 if (skb->protocol == htons(ETH_P_IP)) { 283 if (inet->cmsg_flags) 284 ip_cmsg_recv(msg, skb); 285 } else { 286 if (np->rxopt.all) 287 datagram_recv_ctl(sk, msg, skb); 288 } 289 290 err = copied; 291 if (flags & MSG_TRUNC) 292 err = skb->len - sizeof(struct udphdr); 293 294 out_free: 295 skb_free_datagram(sk, skb); 296 out: 297 return err; 298 299 csum_copy_err: 300 /* Clear queue. */ 301 if (flags&MSG_PEEK) { 302 int clear = 0; 303 spin_lock_bh(&sk->sk_receive_queue.lock); 304 if (skb == skb_peek(&sk->sk_receive_queue)) { 305 __skb_unlink(skb, &sk->sk_receive_queue); 306 clear = 1; 307 } 308 spin_unlock_bh(&sk->sk_receive_queue.lock); 309 if (clear) 310 kfree_skb(skb); 311 } 312 313 skb_free_datagram(sk, skb); 314 315 if (flags & MSG_DONTWAIT) { 316 UDP6_INC_STATS_USER(UDP_MIB_INERRORS); 317 return -EAGAIN; 318 } 319 goto try_again; 320 } 321 322 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 323 int type, int code, int offset, __u32 info) 324 { 325 struct ipv6_pinfo *np; 326 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 327 struct net_device *dev = skb->dev; 328 struct in6_addr *saddr = &hdr->saddr; 329 struct in6_addr *daddr = &hdr->daddr; 330 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 331 struct sock *sk; 332 int err; 333 334 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex); 335 336 if (sk == NULL) 337 return; 338 339 np = inet6_sk(sk); 340 341 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 342 goto out; 343 344 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 345 goto out; 346 347 if (np->recverr) 348 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 349 350 sk->sk_err = err; 351 sk->sk_error_report(sk); 352 out: 353 sock_put(sk); 354 } 355 356 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 357 { 358 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 359 kfree_skb(skb); 360 return -1; 361 } 362 363 if (skb->ip_summed != CHECKSUM_UNNECESSARY) { 364 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { 365 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 366 kfree_skb(skb); 367 return 0; 368 } 369 skb->ip_summed = CHECKSUM_UNNECESSARY; 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 return s; 409 continue; 410 } 411 if(!inet6_mc_check(s, loc_addr, rmt_addr)) 412 continue; 413 return s; 414 } 415 } 416 return NULL; 417 } 418 419 /* 420 * Note: called only from the BH handler context, 421 * so we don't need to lock the hashes. 422 */ 423 static void udpv6_mcast_deliver(struct udphdr *uh, 424 struct in6_addr *saddr, struct in6_addr *daddr, 425 struct sk_buff *skb) 426 { 427 struct sock *sk, *sk2; 428 int dif; 429 430 read_lock(&udp_hash_lock); 431 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 432 dif = skb->dev->ifindex; 433 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 434 if (!sk) { 435 kfree_skb(skb); 436 goto out; 437 } 438 439 sk2 = sk; 440 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 441 uh->source, saddr, dif))) { 442 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 443 if (buff) 444 udpv6_queue_rcv_skb(sk2, buff); 445 } 446 udpv6_queue_rcv_skb(sk, skb); 447 out: 448 read_unlock(&udp_hash_lock); 449 } 450 451 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) 452 { 453 struct sk_buff *skb = *pskb; 454 struct sock *sk; 455 struct udphdr *uh; 456 struct net_device *dev = skb->dev; 457 struct in6_addr *saddr, *daddr; 458 u32 ulen = 0; 459 460 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 461 goto short_packet; 462 463 saddr = &skb->nh.ipv6h->saddr; 464 daddr = &skb->nh.ipv6h->daddr; 465 uh = skb->h.uh; 466 467 ulen = ntohs(uh->len); 468 469 /* Check for jumbo payload */ 470 if (ulen == 0) 471 ulen = skb->len; 472 473 if (ulen > skb->len || ulen < sizeof(*uh)) 474 goto short_packet; 475 476 if (uh->check == 0) { 477 /* RFC 2460 section 8.1 says that we SHOULD log 478 this error. Well, it is reasonable. 479 */ 480 LIMIT_NETDEBUG( 481 printk(KERN_INFO "IPv6: udp checksum is 0\n")); 482 goto discard; 483 } 484 485 if (ulen < skb->len) { 486 if (__pskb_trim(skb, ulen)) 487 goto discard; 488 saddr = &skb->nh.ipv6h->saddr; 489 daddr = &skb->nh.ipv6h->daddr; 490 uh = skb->h.uh; 491 } 492 493 if (skb->ip_summed==CHECKSUM_HW) { 494 skb->ip_summed = CHECKSUM_UNNECESSARY; 495 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) { 496 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n")); 497 skb->ip_summed = CHECKSUM_NONE; 498 } 499 } 500 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 501 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0); 502 503 /* 504 * Multicast receive code 505 */ 506 if (ipv6_addr_is_multicast(daddr)) { 507 udpv6_mcast_deliver(uh, saddr, daddr, skb); 508 return 0; 509 } 510 511 /* Unicast */ 512 513 /* 514 * check socket cache ... must talk to Alan about his plans 515 * for sock caches... i'll skip this for now. 516 */ 517 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex); 518 519 if (sk == NULL) { 520 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 521 goto discard; 522 523 if (skb->ip_summed != CHECKSUM_UNNECESSARY && 524 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) 525 goto discard; 526 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS); 527 528 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 529 530 kfree_skb(skb); 531 return(0); 532 } 533 534 /* deliver */ 535 536 udpv6_queue_rcv_skb(sk, skb); 537 sock_put(sk); 538 return(0); 539 540 short_packet: 541 if (net_ratelimit()) 542 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len); 543 544 discard: 545 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 546 kfree_skb(skb); 547 return(0); 548 } 549 /* 550 * Throw away all pending data and cancel the corking. Socket is locked. 551 */ 552 static void udp_v6_flush_pending_frames(struct sock *sk) 553 { 554 struct udp_sock *up = udp_sk(sk); 555 556 if (up->pending) { 557 up->len = 0; 558 up->pending = 0; 559 ip6_flush_pending_frames(sk); 560 } 561 } 562 563 /* 564 * Sending 565 */ 566 567 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up) 568 { 569 struct sk_buff *skb; 570 struct udphdr *uh; 571 struct inet_sock *inet = inet_sk(sk); 572 struct flowi *fl = &inet->cork.fl; 573 int err = 0; 574 575 /* Grab the skbuff where UDP header space exists. */ 576 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 577 goto out; 578 579 /* 580 * Create a UDP header 581 */ 582 uh = skb->h.uh; 583 uh->source = fl->fl_ip_sport; 584 uh->dest = fl->fl_ip_dport; 585 uh->len = htons(up->len); 586 uh->check = 0; 587 588 if (sk->sk_no_check == UDP_CSUM_NOXMIT) { 589 skb->ip_summed = CHECKSUM_NONE; 590 goto send; 591 } 592 593 if (skb_queue_len(&sk->sk_write_queue) == 1) { 594 skb->csum = csum_partial((char *)uh, 595 sizeof(struct udphdr), skb->csum); 596 uh->check = csum_ipv6_magic(&fl->fl6_src, 597 &fl->fl6_dst, 598 up->len, fl->proto, skb->csum); 599 } else { 600 u32 tmp_csum = 0; 601 602 skb_queue_walk(&sk->sk_write_queue, skb) { 603 tmp_csum = csum_add(tmp_csum, skb->csum); 604 } 605 tmp_csum = csum_partial((char *)uh, 606 sizeof(struct udphdr), tmp_csum); 607 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 608 &fl->fl6_dst, 609 up->len, fl->proto, tmp_csum); 610 uh->check = tmp_csum; 611 612 } 613 if (uh->check == 0) 614 uh->check = -1; 615 616 send: 617 err = ip6_push_pending_frames(sk); 618 out: 619 up->len = 0; 620 up->pending = 0; 621 return err; 622 } 623 624 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 625 struct msghdr *msg, size_t len) 626 { 627 struct ipv6_txoptions opt_space; 628 struct udp_sock *up = udp_sk(sk); 629 struct inet_sock *inet = inet_sk(sk); 630 struct ipv6_pinfo *np = inet6_sk(sk); 631 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 632 struct in6_addr *daddr, *final_p = NULL, final; 633 struct ipv6_txoptions *opt = NULL; 634 struct ip6_flowlabel *flowlabel = NULL; 635 struct flowi *fl = &inet->cork.fl; 636 struct dst_entry *dst; 637 int addr_len = msg->msg_namelen; 638 int ulen = len; 639 int hlimit = -1; 640 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 641 int err; 642 643 /* destination address check */ 644 if (sin6) { 645 if (addr_len < offsetof(struct sockaddr, sa_data)) 646 return -EINVAL; 647 648 switch (sin6->sin6_family) { 649 case AF_INET6: 650 if (addr_len < SIN6_LEN_RFC2133) 651 return -EINVAL; 652 daddr = &sin6->sin6_addr; 653 break; 654 case AF_INET: 655 goto do_udp_sendmsg; 656 case AF_UNSPEC: 657 msg->msg_name = sin6 = NULL; 658 msg->msg_namelen = addr_len = 0; 659 daddr = NULL; 660 break; 661 default: 662 return -EINVAL; 663 } 664 } else if (!up->pending) { 665 if (sk->sk_state != TCP_ESTABLISHED) 666 return -EDESTADDRREQ; 667 daddr = &np->daddr; 668 } else 669 daddr = NULL; 670 671 if (daddr) { 672 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 673 struct sockaddr_in sin; 674 sin.sin_family = AF_INET; 675 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 676 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 677 msg->msg_name = &sin; 678 msg->msg_namelen = sizeof(sin); 679 do_udp_sendmsg: 680 if (__ipv6_only_sock(sk)) 681 return -ENETUNREACH; 682 return udp_sendmsg(iocb, sk, msg, len); 683 } 684 } 685 686 if (up->pending == AF_INET) 687 return udp_sendmsg(iocb, sk, msg, len); 688 689 /* Rough check on arithmetic overflow, 690 better check is made in ip6_build_xmit 691 */ 692 if (len > INT_MAX - sizeof(struct udphdr)) 693 return -EMSGSIZE; 694 695 if (up->pending) { 696 /* 697 * There are pending frames. 698 * The socket lock must be held while it's corked. 699 */ 700 lock_sock(sk); 701 if (likely(up->pending)) { 702 if (unlikely(up->pending != AF_INET6)) { 703 release_sock(sk); 704 return -EAFNOSUPPORT; 705 } 706 dst = NULL; 707 goto do_append_data; 708 } 709 release_sock(sk); 710 } 711 ulen += sizeof(struct udphdr); 712 713 memset(fl, 0, sizeof(*fl)); 714 715 if (sin6) { 716 if (sin6->sin6_port == 0) 717 return -EINVAL; 718 719 fl->fl_ip_dport = sin6->sin6_port; 720 daddr = &sin6->sin6_addr; 721 722 if (np->sndflow) { 723 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 724 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 725 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 726 if (flowlabel == NULL) 727 return -EINVAL; 728 daddr = &flowlabel->dst; 729 } 730 } 731 732 /* 733 * Otherwise it will be difficult to maintain 734 * sk->sk_dst_cache. 735 */ 736 if (sk->sk_state == TCP_ESTABLISHED && 737 ipv6_addr_equal(daddr, &np->daddr)) 738 daddr = &np->daddr; 739 740 if (addr_len >= sizeof(struct sockaddr_in6) && 741 sin6->sin6_scope_id && 742 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 743 fl->oif = sin6->sin6_scope_id; 744 } else { 745 if (sk->sk_state != TCP_ESTABLISHED) 746 return -EDESTADDRREQ; 747 748 fl->fl_ip_dport = inet->dport; 749 daddr = &np->daddr; 750 fl->fl6_flowlabel = np->flow_label; 751 } 752 753 if (!fl->oif) 754 fl->oif = sk->sk_bound_dev_if; 755 756 if (msg->msg_controllen) { 757 opt = &opt_space; 758 memset(opt, 0, sizeof(struct ipv6_txoptions)); 759 opt->tot_len = sizeof(*opt); 760 761 err = datagram_send_ctl(msg, fl, opt, &hlimit); 762 if (err < 0) { 763 fl6_sock_release(flowlabel); 764 return err; 765 } 766 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 767 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 768 if (flowlabel == NULL) 769 return -EINVAL; 770 } 771 if (!(opt->opt_nflen|opt->opt_flen)) 772 opt = NULL; 773 } 774 if (opt == NULL) 775 opt = np->opt; 776 if (flowlabel) 777 opt = fl6_merge_options(&opt_space, flowlabel, opt); 778 779 fl->proto = IPPROTO_UDP; 780 ipv6_addr_copy(&fl->fl6_dst, daddr); 781 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr)) 782 ipv6_addr_copy(&fl->fl6_src, &np->saddr); 783 fl->fl_ip_sport = inet->sport; 784 785 /* merge ip6_build_xmit from ip6_output */ 786 if (opt && opt->srcrt) { 787 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 788 ipv6_addr_copy(&final, &fl->fl6_dst); 789 ipv6_addr_copy(&fl->fl6_dst, rt0->addr); 790 final_p = &final; 791 } 792 793 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) 794 fl->oif = np->mcast_oif; 795 796 err = ip6_dst_lookup(sk, &dst, fl); 797 if (err) 798 goto out; 799 if (final_p) 800 ipv6_addr_copy(&fl->fl6_dst, final_p); 801 802 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) { 803 dst_release(dst); 804 goto out; 805 } 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 (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(printk(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, sizeof(struct udphdr), 838 hlimit, opt, fl, (struct rt6_info*)dst, 839 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 840 if (err) 841 udp_v6_flush_pending_frames(sk); 842 else if (!corkreq) 843 err = udp_v6_push_pending_frames(sk, up); 844 845 if (dst) 846 ip6_dst_store(sk, dst, 847 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ? 848 &np->daddr : NULL); 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 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 (level != SOL_UDP) 890 return ipv6_setsockopt(sk, level, optname, optval, optlen); 891 892 if(optlen<sizeof(int)) 893 return -EINVAL; 894 895 if (get_user(val, (int __user *)optval)) 896 return -EFAULT; 897 898 switch(optname) { 899 case UDP_CORK: 900 if (val != 0) { 901 up->corkflag = 1; 902 } else { 903 up->corkflag = 0; 904 lock_sock(sk); 905 udp_v6_push_pending_frames(sk, up); 906 release_sock(sk); 907 } 908 break; 909 910 case UDP_ENCAP: 911 switch (val) { 912 case 0: 913 up->encap_type = val; 914 break; 915 default: 916 err = -ENOPROTOOPT; 917 break; 918 } 919 break; 920 921 default: 922 err = -ENOPROTOOPT; 923 break; 924 }; 925 926 return err; 927 } 928 929 static int udpv6_getsockopt(struct sock *sk, int level, int optname, 930 char __user *optval, int __user *optlen) 931 { 932 struct udp_sock *up = udp_sk(sk); 933 int val, len; 934 935 if (level != SOL_UDP) 936 return ipv6_getsockopt(sk, level, optname, optval, optlen); 937 938 if(get_user(len,optlen)) 939 return -EFAULT; 940 941 len = min_t(unsigned int, len, sizeof(int)); 942 943 if(len < 0) 944 return -EINVAL; 945 946 switch(optname) { 947 case UDP_CORK: 948 val = up->corkflag; 949 break; 950 951 case UDP_ENCAP: 952 val = up->encap_type; 953 break; 954 955 default: 956 return -ENOPROTOOPT; 957 }; 958 959 if(put_user(len, optlen)) 960 return -EFAULT; 961 if(copy_to_user(optval, &val,len)) 962 return -EFAULT; 963 return 0; 964 } 965 966 static struct inet6_protocol udpv6_protocol = { 967 .handler = udpv6_rcv, 968 .err_handler = udpv6_err, 969 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 970 }; 971 972 /* ------------------------------------------------------------------------ */ 973 #ifdef CONFIG_PROC_FS 974 975 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 976 { 977 struct inet_sock *inet = inet_sk(sp); 978 struct ipv6_pinfo *np = inet6_sk(sp); 979 struct in6_addr *dest, *src; 980 __u16 destp, srcp; 981 982 dest = &np->daddr; 983 src = &np->rcv_saddr; 984 destp = ntohs(inet->dport); 985 srcp = ntohs(inet->sport); 986 seq_printf(seq, 987 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 988 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 989 bucket, 990 src->s6_addr32[0], src->s6_addr32[1], 991 src->s6_addr32[2], src->s6_addr32[3], srcp, 992 dest->s6_addr32[0], dest->s6_addr32[1], 993 dest->s6_addr32[2], dest->s6_addr32[3], destp, 994 sp->sk_state, 995 atomic_read(&sp->sk_wmem_alloc), 996 atomic_read(&sp->sk_rmem_alloc), 997 0, 0L, 0, 998 sock_i_uid(sp), 0, 999 sock_i_ino(sp), 1000 atomic_read(&sp->sk_refcnt), sp); 1001 } 1002 1003 static int udp6_seq_show(struct seq_file *seq, void *v) 1004 { 1005 if (v == SEQ_START_TOKEN) 1006 seq_printf(seq, 1007 " sl " 1008 "local_address " 1009 "remote_address " 1010 "st tx_queue rx_queue tr tm->when retrnsmt" 1011 " uid timeout inode\n"); 1012 else 1013 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1014 return 0; 1015 } 1016 1017 static struct file_operations udp6_seq_fops; 1018 static struct udp_seq_afinfo udp6_seq_afinfo = { 1019 .owner = THIS_MODULE, 1020 .name = "udp6", 1021 .family = AF_INET6, 1022 .seq_show = udp6_seq_show, 1023 .seq_fops = &udp6_seq_fops, 1024 }; 1025 1026 int __init udp6_proc_init(void) 1027 { 1028 return udp_proc_register(&udp6_seq_afinfo); 1029 } 1030 1031 void udp6_proc_exit(void) { 1032 udp_proc_unregister(&udp6_seq_afinfo); 1033 } 1034 #endif /* CONFIG_PROC_FS */ 1035 1036 /* ------------------------------------------------------------------------ */ 1037 1038 struct proto udpv6_prot = { 1039 .name = "UDPv6", 1040 .owner = THIS_MODULE, 1041 .close = udpv6_close, 1042 .connect = ip6_datagram_connect, 1043 .disconnect = udp_disconnect, 1044 .ioctl = udp_ioctl, 1045 .destroy = udpv6_destroy_sock, 1046 .setsockopt = udpv6_setsockopt, 1047 .getsockopt = udpv6_getsockopt, 1048 .sendmsg = udpv6_sendmsg, 1049 .recvmsg = udpv6_recvmsg, 1050 .backlog_rcv = udpv6_queue_rcv_skb, 1051 .hash = udp_v6_hash, 1052 .unhash = udp_v6_unhash, 1053 .get_port = udp_v6_get_port, 1054 .obj_size = sizeof(struct udp6_sock), 1055 }; 1056 1057 extern struct proto_ops inet6_dgram_ops; 1058 1059 static struct inet_protosw udpv6_protosw = { 1060 .type = SOCK_DGRAM, 1061 .protocol = IPPROTO_UDP, 1062 .prot = &udpv6_prot, 1063 .ops = &inet6_dgram_ops, 1064 .capability =-1, 1065 .no_check = UDP_CSUM_DEFAULT, 1066 .flags = INET_PROTOSW_PERMANENT, 1067 }; 1068 1069 1070 void __init udpv6_init(void) 1071 { 1072 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1073 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1074 inet6_register_protosw(&udpv6_protosw); 1075 } 1076