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 ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) 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->ip_summed != CHECKSUM_UNNECESSARY) { 367 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { 368 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 369 kfree_skb(skb); 370 return 0; 371 } 372 skb->ip_summed = CHECKSUM_UNNECESSARY; 373 } 374 375 if (sock_queue_rcv_skb(sk,skb)<0) { 376 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 377 kfree_skb(skb); 378 return 0; 379 } 380 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS); 381 return 0; 382 } 383 384 static struct sock *udp_v6_mcast_next(struct sock *sk, 385 u16 loc_port, struct in6_addr *loc_addr, 386 u16 rmt_port, struct in6_addr *rmt_addr, 387 int dif) 388 { 389 struct hlist_node *node; 390 struct sock *s = sk; 391 unsigned short num = ntohs(loc_port); 392 393 sk_for_each_from(s, node) { 394 struct inet_sock *inet = inet_sk(s); 395 396 if (inet->num == num && s->sk_family == PF_INET6) { 397 struct ipv6_pinfo *np = inet6_sk(s); 398 if (inet->dport) { 399 if (inet->dport != rmt_port) 400 continue; 401 } 402 if (!ipv6_addr_any(&np->daddr) && 403 !ipv6_addr_equal(&np->daddr, rmt_addr)) 404 continue; 405 406 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 407 continue; 408 409 if (!ipv6_addr_any(&np->rcv_saddr)) { 410 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 411 continue; 412 } 413 if(!inet6_mc_check(s, loc_addr, rmt_addr)) 414 continue; 415 return s; 416 } 417 } 418 return NULL; 419 } 420 421 /* 422 * Note: called only from the BH handler context, 423 * so we don't need to lock the hashes. 424 */ 425 static void udpv6_mcast_deliver(struct udphdr *uh, 426 struct in6_addr *saddr, struct in6_addr *daddr, 427 struct sk_buff *skb) 428 { 429 struct sock *sk, *sk2; 430 int dif; 431 432 read_lock(&udp_hash_lock); 433 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 434 dif = skb->dev->ifindex; 435 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 436 if (!sk) { 437 kfree_skb(skb); 438 goto out; 439 } 440 441 sk2 = sk; 442 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 443 uh->source, saddr, dif))) { 444 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 445 if (buff) 446 udpv6_queue_rcv_skb(sk2, buff); 447 } 448 udpv6_queue_rcv_skb(sk, skb); 449 out: 450 read_unlock(&udp_hash_lock); 451 } 452 453 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) 454 { 455 struct sk_buff *skb = *pskb; 456 struct sock *sk; 457 struct udphdr *uh; 458 struct net_device *dev = skb->dev; 459 struct in6_addr *saddr, *daddr; 460 u32 ulen = 0; 461 462 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 463 goto short_packet; 464 465 saddr = &skb->nh.ipv6h->saddr; 466 daddr = &skb->nh.ipv6h->daddr; 467 uh = skb->h.uh; 468 469 ulen = ntohs(uh->len); 470 471 /* Check for jumbo payload */ 472 if (ulen == 0) 473 ulen = skb->len; 474 475 if (ulen > skb->len || ulen < sizeof(*uh)) 476 goto short_packet; 477 478 if (uh->check == 0) { 479 /* RFC 2460 section 8.1 says that we SHOULD log 480 this error. Well, it is reasonable. 481 */ 482 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 483 goto discard; 484 } 485 486 if (ulen < skb->len) { 487 if (pskb_trim_rcsum(skb, ulen)) 488 goto discard; 489 saddr = &skb->nh.ipv6h->saddr; 490 daddr = &skb->nh.ipv6h->daddr; 491 uh = skb->h.uh; 492 } 493 494 if (skb->ip_summed==CHECKSUM_HW) { 495 skb->ip_summed = CHECKSUM_UNNECESSARY; 496 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) { 497 LIMIT_NETDEBUG(KERN_DEBUG "udp v6 hw csum failure.\n"); 498 skb->ip_summed = CHECKSUM_NONE; 499 } 500 } 501 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 502 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0); 503 504 /* 505 * Multicast receive code 506 */ 507 if (ipv6_addr_is_multicast(daddr)) { 508 udpv6_mcast_deliver(uh, saddr, daddr, skb); 509 return 0; 510 } 511 512 /* Unicast */ 513 514 /* 515 * check socket cache ... must talk to Alan about his plans 516 * for sock caches... i'll skip this for now. 517 */ 518 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex); 519 520 if (sk == NULL) { 521 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 522 goto discard; 523 524 if (skb->ip_summed != CHECKSUM_UNNECESSARY && 525 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) 526 goto discard; 527 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS); 528 529 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 530 531 kfree_skb(skb); 532 return(0); 533 } 534 535 /* deliver */ 536 537 udpv6_queue_rcv_skb(sk, skb); 538 sock_put(sk); 539 return(0); 540 541 short_packet: 542 if (net_ratelimit()) 543 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len); 544 545 discard: 546 UDP6_INC_STATS_BH(UDP_MIB_INERRORS); 547 kfree_skb(skb); 548 return(0); 549 } 550 /* 551 * Throw away all pending data and cancel the corking. Socket is locked. 552 */ 553 static void udp_v6_flush_pending_frames(struct sock *sk) 554 { 555 struct udp_sock *up = udp_sk(sk); 556 557 if (up->pending) { 558 up->len = 0; 559 up->pending = 0; 560 ip6_flush_pending_frames(sk); 561 } 562 } 563 564 /* 565 * Sending 566 */ 567 568 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up) 569 { 570 struct sk_buff *skb; 571 struct udphdr *uh; 572 struct inet_sock *inet = inet_sk(sk); 573 struct flowi *fl = &inet->cork.fl; 574 int err = 0; 575 576 /* Grab the skbuff where UDP header space exists. */ 577 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 578 goto out; 579 580 /* 581 * Create a UDP header 582 */ 583 uh = skb->h.uh; 584 uh->source = fl->fl_ip_sport; 585 uh->dest = fl->fl_ip_dport; 586 uh->len = htons(up->len); 587 uh->check = 0; 588 589 if (sk->sk_no_check == UDP_CSUM_NOXMIT) { 590 skb->ip_summed = CHECKSUM_NONE; 591 goto send; 592 } 593 594 if (skb_queue_len(&sk->sk_write_queue) == 1) { 595 skb->csum = csum_partial((char *)uh, 596 sizeof(struct udphdr), skb->csum); 597 uh->check = csum_ipv6_magic(&fl->fl6_src, 598 &fl->fl6_dst, 599 up->len, fl->proto, skb->csum); 600 } else { 601 u32 tmp_csum = 0; 602 603 skb_queue_walk(&sk->sk_write_queue, skb) { 604 tmp_csum = csum_add(tmp_csum, skb->csum); 605 } 606 tmp_csum = csum_partial((char *)uh, 607 sizeof(struct udphdr), tmp_csum); 608 tmp_csum = csum_ipv6_magic(&fl->fl6_src, 609 &fl->fl6_dst, 610 up->len, fl->proto, tmp_csum); 611 uh->check = tmp_csum; 612 613 } 614 if (uh->check == 0) 615 uh->check = -1; 616 617 send: 618 err = ip6_push_pending_frames(sk); 619 out: 620 up->len = 0; 621 up->pending = 0; 622 return err; 623 } 624 625 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 626 struct msghdr *msg, size_t len) 627 { 628 struct ipv6_txoptions opt_space; 629 struct udp_sock *up = udp_sk(sk); 630 struct inet_sock *inet = inet_sk(sk); 631 struct ipv6_pinfo *np = inet6_sk(sk); 632 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 633 struct in6_addr *daddr, *final_p = NULL, final; 634 struct ipv6_txoptions *opt = NULL; 635 struct ip6_flowlabel *flowlabel = NULL; 636 struct flowi *fl = &inet->cork.fl; 637 struct dst_entry *dst; 638 int addr_len = msg->msg_namelen; 639 int ulen = len; 640 int hlimit = -1; 641 int tclass = -1; 642 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 643 int err; 644 int connected = 0; 645 646 /* destination address check */ 647 if (sin6) { 648 if (addr_len < offsetof(struct sockaddr, sa_data)) 649 return -EINVAL; 650 651 switch (sin6->sin6_family) { 652 case AF_INET6: 653 if (addr_len < SIN6_LEN_RFC2133) 654 return -EINVAL; 655 daddr = &sin6->sin6_addr; 656 break; 657 case AF_INET: 658 goto do_udp_sendmsg; 659 case AF_UNSPEC: 660 msg->msg_name = sin6 = NULL; 661 msg->msg_namelen = addr_len = 0; 662 daddr = NULL; 663 break; 664 default: 665 return -EINVAL; 666 } 667 } else if (!up->pending) { 668 if (sk->sk_state != TCP_ESTABLISHED) 669 return -EDESTADDRREQ; 670 daddr = &np->daddr; 671 } else 672 daddr = NULL; 673 674 if (daddr) { 675 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 676 struct sockaddr_in sin; 677 sin.sin_family = AF_INET; 678 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 679 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 680 msg->msg_name = &sin; 681 msg->msg_namelen = sizeof(sin); 682 do_udp_sendmsg: 683 if (__ipv6_only_sock(sk)) 684 return -ENETUNREACH; 685 return udp_sendmsg(iocb, sk, msg, len); 686 } 687 } 688 689 if (up->pending == AF_INET) 690 return udp_sendmsg(iocb, sk, msg, len); 691 692 /* Rough check on arithmetic overflow, 693 better check is made in ip6_build_xmit 694 */ 695 if (len > INT_MAX - sizeof(struct udphdr)) 696 return -EMSGSIZE; 697 698 if (up->pending) { 699 /* 700 * There are pending frames. 701 * The socket lock must be held while it's corked. 702 */ 703 lock_sock(sk); 704 if (likely(up->pending)) { 705 if (unlikely(up->pending != AF_INET6)) { 706 release_sock(sk); 707 return -EAFNOSUPPORT; 708 } 709 dst = NULL; 710 goto do_append_data; 711 } 712 release_sock(sk); 713 } 714 ulen += sizeof(struct udphdr); 715 716 memset(fl, 0, sizeof(*fl)); 717 718 if (sin6) { 719 if (sin6->sin6_port == 0) 720 return -EINVAL; 721 722 fl->fl_ip_dport = sin6->sin6_port; 723 daddr = &sin6->sin6_addr; 724 725 if (np->sndflow) { 726 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 727 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 728 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 729 if (flowlabel == NULL) 730 return -EINVAL; 731 daddr = &flowlabel->dst; 732 } 733 } 734 735 /* 736 * Otherwise it will be difficult to maintain 737 * sk->sk_dst_cache. 738 */ 739 if (sk->sk_state == TCP_ESTABLISHED && 740 ipv6_addr_equal(daddr, &np->daddr)) 741 daddr = &np->daddr; 742 743 if (addr_len >= sizeof(struct sockaddr_in6) && 744 sin6->sin6_scope_id && 745 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 746 fl->oif = sin6->sin6_scope_id; 747 } else { 748 if (sk->sk_state != TCP_ESTABLISHED) 749 return -EDESTADDRREQ; 750 751 fl->fl_ip_dport = inet->dport; 752 daddr = &np->daddr; 753 fl->fl6_flowlabel = np->flow_label; 754 connected = 1; 755 } 756 757 if (!fl->oif) 758 fl->oif = sk->sk_bound_dev_if; 759 760 if (msg->msg_controllen) { 761 opt = &opt_space; 762 memset(opt, 0, sizeof(struct ipv6_txoptions)); 763 opt->tot_len = sizeof(*opt); 764 765 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass); 766 if (err < 0) { 767 fl6_sock_release(flowlabel); 768 return err; 769 } 770 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 771 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel); 772 if (flowlabel == NULL) 773 return -EINVAL; 774 } 775 if (!(opt->opt_nflen|opt->opt_flen)) 776 opt = NULL; 777 connected = 0; 778 } 779 if (opt == NULL) 780 opt = np->opt; 781 opt = fl6_merge_options(&opt_space, flowlabel, opt); 782 783 fl->proto = IPPROTO_UDP; 784 ipv6_addr_copy(&fl->fl6_dst, daddr); 785 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr)) 786 ipv6_addr_copy(&fl->fl6_src, &np->saddr); 787 fl->fl_ip_sport = inet->sport; 788 789 /* merge ip6_build_xmit from ip6_output */ 790 if (opt && opt->srcrt) { 791 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 792 ipv6_addr_copy(&final, &fl->fl6_dst); 793 ipv6_addr_copy(&fl->fl6_dst, rt0->addr); 794 final_p = &final; 795 connected = 0; 796 } 797 798 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) { 799 fl->oif = np->mcast_oif; 800 connected = 0; 801 } 802 803 err = ip6_dst_lookup(sk, &dst, fl); 804 if (err) 805 goto out; 806 if (final_p) 807 ipv6_addr_copy(&fl->fl6_dst, final_p); 808 809 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) 810 goto out; 811 812 if (hlimit < 0) { 813 if (ipv6_addr_is_multicast(&fl->fl6_dst)) 814 hlimit = np->mcast_hops; 815 else 816 hlimit = np->hop_limit; 817 if (hlimit < 0) 818 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 819 if (hlimit < 0) 820 hlimit = ipv6_get_hoplimit(dst->dev); 821 } 822 823 if (tclass < 0) { 824 tclass = np->tclass; 825 if (tclass < 0) 826 tclass = 0; 827 } 828 829 if (msg->msg_flags&MSG_CONFIRM) 830 goto do_confirm; 831 back_from_confirm: 832 833 lock_sock(sk); 834 if (unlikely(up->pending)) { 835 /* The socket is already corked while preparing it. */ 836 /* ... which is an evident application bug. --ANK */ 837 release_sock(sk); 838 839 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 840 err = -EINVAL; 841 goto out; 842 } 843 844 up->pending = AF_INET6; 845 846 do_append_data: 847 up->len += ulen; 848 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, 849 sizeof(struct udphdr), hlimit, tclass, opt, fl, 850 (struct rt6_info*)dst, 851 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 852 if (err) 853 udp_v6_flush_pending_frames(sk); 854 else if (!corkreq) 855 err = udp_v6_push_pending_frames(sk, up); 856 857 if (dst) { 858 if (connected) { 859 ip6_dst_store(sk, dst, 860 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ? 861 &np->daddr : NULL); 862 } else { 863 dst_release(dst); 864 } 865 } 866 867 if (err > 0) 868 err = np->recverr ? net_xmit_errno(err) : 0; 869 release_sock(sk); 870 out: 871 fl6_sock_release(flowlabel); 872 if (!err) { 873 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS); 874 return len; 875 } 876 return err; 877 878 do_confirm: 879 dst_confirm(dst); 880 if (!(msg->msg_flags&MSG_PROBE) || len) 881 goto back_from_confirm; 882 err = 0; 883 goto out; 884 } 885 886 static int udpv6_destroy_sock(struct sock *sk) 887 { 888 lock_sock(sk); 889 udp_v6_flush_pending_frames(sk); 890 release_sock(sk); 891 892 inet6_destroy_sock(sk); 893 894 return 0; 895 } 896 897 /* 898 * Socket option code for UDP 899 */ 900 static int udpv6_setsockopt(struct sock *sk, int level, int optname, 901 char __user *optval, int optlen) 902 { 903 struct udp_sock *up = udp_sk(sk); 904 int val; 905 int err = 0; 906 907 if (level != SOL_UDP) 908 return ipv6_setsockopt(sk, level, optname, optval, optlen); 909 910 if(optlen<sizeof(int)) 911 return -EINVAL; 912 913 if (get_user(val, (int __user *)optval)) 914 return -EFAULT; 915 916 switch(optname) { 917 case UDP_CORK: 918 if (val != 0) { 919 up->corkflag = 1; 920 } else { 921 up->corkflag = 0; 922 lock_sock(sk); 923 udp_v6_push_pending_frames(sk, up); 924 release_sock(sk); 925 } 926 break; 927 928 case UDP_ENCAP: 929 switch (val) { 930 case 0: 931 up->encap_type = val; 932 break; 933 default: 934 err = -ENOPROTOOPT; 935 break; 936 } 937 break; 938 939 default: 940 err = -ENOPROTOOPT; 941 break; 942 }; 943 944 return err; 945 } 946 947 static int udpv6_getsockopt(struct sock *sk, int level, int optname, 948 char __user *optval, int __user *optlen) 949 { 950 struct udp_sock *up = udp_sk(sk); 951 int val, len; 952 953 if (level != SOL_UDP) 954 return ipv6_getsockopt(sk, level, optname, optval, optlen); 955 956 if(get_user(len,optlen)) 957 return -EFAULT; 958 959 len = min_t(unsigned int, len, sizeof(int)); 960 961 if(len < 0) 962 return -EINVAL; 963 964 switch(optname) { 965 case UDP_CORK: 966 val = up->corkflag; 967 break; 968 969 case UDP_ENCAP: 970 val = up->encap_type; 971 break; 972 973 default: 974 return -ENOPROTOOPT; 975 }; 976 977 if(put_user(len, optlen)) 978 return -EFAULT; 979 if(copy_to_user(optval, &val,len)) 980 return -EFAULT; 981 return 0; 982 } 983 984 static struct inet6_protocol udpv6_protocol = { 985 .handler = udpv6_rcv, 986 .err_handler = udpv6_err, 987 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 988 }; 989 990 /* ------------------------------------------------------------------------ */ 991 #ifdef CONFIG_PROC_FS 992 993 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 994 { 995 struct inet_sock *inet = inet_sk(sp); 996 struct ipv6_pinfo *np = inet6_sk(sp); 997 struct in6_addr *dest, *src; 998 __u16 destp, srcp; 999 1000 dest = &np->daddr; 1001 src = &np->rcv_saddr; 1002 destp = ntohs(inet->dport); 1003 srcp = ntohs(inet->sport); 1004 seq_printf(seq, 1005 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1006 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 1007 bucket, 1008 src->s6_addr32[0], src->s6_addr32[1], 1009 src->s6_addr32[2], src->s6_addr32[3], srcp, 1010 dest->s6_addr32[0], dest->s6_addr32[1], 1011 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1012 sp->sk_state, 1013 atomic_read(&sp->sk_wmem_alloc), 1014 atomic_read(&sp->sk_rmem_alloc), 1015 0, 0L, 0, 1016 sock_i_uid(sp), 0, 1017 sock_i_ino(sp), 1018 atomic_read(&sp->sk_refcnt), sp); 1019 } 1020 1021 static int udp6_seq_show(struct seq_file *seq, void *v) 1022 { 1023 if (v == SEQ_START_TOKEN) 1024 seq_printf(seq, 1025 " sl " 1026 "local_address " 1027 "remote_address " 1028 "st tx_queue rx_queue tr tm->when retrnsmt" 1029 " uid timeout inode\n"); 1030 else 1031 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1032 return 0; 1033 } 1034 1035 static struct file_operations udp6_seq_fops; 1036 static struct udp_seq_afinfo udp6_seq_afinfo = { 1037 .owner = THIS_MODULE, 1038 .name = "udp6", 1039 .family = AF_INET6, 1040 .seq_show = udp6_seq_show, 1041 .seq_fops = &udp6_seq_fops, 1042 }; 1043 1044 int __init udp6_proc_init(void) 1045 { 1046 return udp_proc_register(&udp6_seq_afinfo); 1047 } 1048 1049 void udp6_proc_exit(void) { 1050 udp_proc_unregister(&udp6_seq_afinfo); 1051 } 1052 #endif /* CONFIG_PROC_FS */ 1053 1054 /* ------------------------------------------------------------------------ */ 1055 1056 struct proto udpv6_prot = { 1057 .name = "UDPv6", 1058 .owner = THIS_MODULE, 1059 .close = udpv6_close, 1060 .connect = ip6_datagram_connect, 1061 .disconnect = udp_disconnect, 1062 .ioctl = udp_ioctl, 1063 .destroy = udpv6_destroy_sock, 1064 .setsockopt = udpv6_setsockopt, 1065 .getsockopt = udpv6_getsockopt, 1066 .sendmsg = udpv6_sendmsg, 1067 .recvmsg = udpv6_recvmsg, 1068 .backlog_rcv = udpv6_queue_rcv_skb, 1069 .hash = udp_v6_hash, 1070 .unhash = udp_v6_unhash, 1071 .get_port = udp_v6_get_port, 1072 .obj_size = sizeof(struct udp6_sock), 1073 }; 1074 1075 static struct inet_protosw udpv6_protosw = { 1076 .type = SOCK_DGRAM, 1077 .protocol = IPPROTO_UDP, 1078 .prot = &udpv6_prot, 1079 .ops = &inet6_dgram_ops, 1080 .capability =-1, 1081 .no_check = UDP_CSUM_DEFAULT, 1082 .flags = INET_PROTOSW_PERMANENT, 1083 }; 1084 1085 1086 void __init udpv6_init(void) 1087 { 1088 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1089 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1090 inet6_register_protosw(&udpv6_protosw); 1091 } 1092