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/net.h> 31 #include <linux/in6.h> 32 #include <linux/netdevice.h> 33 #include <linux/if_arp.h> 34 #include <linux/ipv6.h> 35 #include <linux/icmpv6.h> 36 #include <linux/init.h> 37 #include <linux/skbuff.h> 38 #include <asm/uaccess.h> 39 40 #include <net/ndisc.h> 41 #include <net/protocol.h> 42 #include <net/transp_v6.h> 43 #include <net/ip6_route.h> 44 #include <net/raw.h> 45 #include <net/tcp_states.h> 46 #include <net/ip6_checksum.h> 47 #include <net/xfrm.h> 48 49 #include <linux/proc_fs.h> 50 #include <linux/seq_file.h> 51 #include "udp_impl.h" 52 53 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly; 54 55 static inline int udp_v6_get_port(struct sock *sk, unsigned short snum) 56 { 57 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal); 58 } 59 60 static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport, 61 struct in6_addr *daddr, __be16 dport, 62 int dif, struct hlist_head udptable[]) 63 { 64 struct sock *sk, *result = NULL; 65 struct hlist_node *node; 66 unsigned short hnum = ntohs(dport); 67 int badness = -1; 68 69 read_lock(&udp_hash_lock); 70 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) { 71 struct inet_sock *inet = inet_sk(sk); 72 73 if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) { 74 struct ipv6_pinfo *np = inet6_sk(sk); 75 int score = 0; 76 if (inet->dport) { 77 if (inet->dport != sport) 78 continue; 79 score++; 80 } 81 if (!ipv6_addr_any(&np->rcv_saddr)) { 82 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 83 continue; 84 score++; 85 } 86 if (!ipv6_addr_any(&np->daddr)) { 87 if (!ipv6_addr_equal(&np->daddr, saddr)) 88 continue; 89 score++; 90 } 91 if (sk->sk_bound_dev_if) { 92 if (sk->sk_bound_dev_if != dif) 93 continue; 94 score++; 95 } 96 if (score == 4) { 97 result = sk; 98 break; 99 } else if (score > badness) { 100 result = sk; 101 badness = score; 102 } 103 } 104 } 105 if (result) 106 sock_hold(result); 107 read_unlock(&udp_hash_lock); 108 return result; 109 } 110 111 /* 112 * This should be easy, if there is something there we 113 * return it, otherwise we block. 114 */ 115 116 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 117 struct msghdr *msg, size_t len, 118 int noblock, int flags, int *addr_len) 119 { 120 struct ipv6_pinfo *np = inet6_sk(sk); 121 struct inet_sock *inet = inet_sk(sk); 122 struct sk_buff *skb; 123 unsigned int ulen, copied; 124 int err; 125 int is_udplite = IS_UDPLITE(sk); 126 127 if (addr_len) 128 *addr_len=sizeof(struct sockaddr_in6); 129 130 if (flags & MSG_ERRQUEUE) 131 return ipv6_recv_error(sk, msg, len); 132 133 try_again: 134 skb = skb_recv_datagram(sk, flags, noblock, &err); 135 if (!skb) 136 goto out; 137 138 ulen = skb->len - sizeof(struct udphdr); 139 copied = len; 140 if (copied > ulen) 141 copied = ulen; 142 else if (copied < ulen) 143 msg->msg_flags |= MSG_TRUNC; 144 145 /* 146 * If checksum is needed at all, try to do it while copying the 147 * data. If the data is truncated, or if we only want a partial 148 * coverage checksum (UDP-Lite), do it before the copy. 149 */ 150 151 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 152 if (udp_lib_checksum_complete(skb)) 153 goto csum_copy_err; 154 } 155 156 if (skb_csum_unnecessary(skb)) 157 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 158 msg->msg_iov, copied ); 159 else { 160 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 161 if (err == -EINVAL) 162 goto csum_copy_err; 163 } 164 if (err) 165 goto out_free; 166 167 sock_recv_timestamp(msg, sk, skb); 168 169 /* Copy the address. */ 170 if (msg->msg_name) { 171 struct sockaddr_in6 *sin6; 172 173 sin6 = (struct sockaddr_in6 *) msg->msg_name; 174 sin6->sin6_family = AF_INET6; 175 sin6->sin6_port = udp_hdr(skb)->source; 176 sin6->sin6_flowinfo = 0; 177 sin6->sin6_scope_id = 0; 178 179 if (skb->protocol == htons(ETH_P_IP)) 180 ipv6_addr_set(&sin6->sin6_addr, 0, 0, 181 htonl(0xffff), ip_hdr(skb)->saddr); 182 else { 183 ipv6_addr_copy(&sin6->sin6_addr, 184 &ipv6_hdr(skb)->saddr); 185 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 186 sin6->sin6_scope_id = IP6CB(skb)->iif; 187 } 188 189 } 190 if (skb->protocol == htons(ETH_P_IP)) { 191 if (inet->cmsg_flags) 192 ip_cmsg_recv(msg, skb); 193 } else { 194 if (np->rxopt.all) 195 datagram_recv_ctl(sk, msg, skb); 196 } 197 198 err = copied; 199 if (flags & MSG_TRUNC) 200 err = ulen; 201 202 out_free: 203 skb_free_datagram(sk, skb); 204 out: 205 return err; 206 207 csum_copy_err: 208 skb_kill_datagram(sk, skb, flags); 209 210 if (flags & MSG_DONTWAIT) { 211 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite); 212 return -EAGAIN; 213 } 214 goto try_again; 215 } 216 217 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 218 int type, int code, int offset, __be32 info, 219 struct hlist_head udptable[] ) 220 { 221 struct ipv6_pinfo *np; 222 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 223 struct in6_addr *saddr = &hdr->saddr; 224 struct in6_addr *daddr = &hdr->daddr; 225 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 226 struct sock *sk; 227 int err; 228 229 sk = __udp6_lib_lookup(daddr, uh->dest, 230 saddr, uh->source, inet6_iif(skb), udptable); 231 if (sk == NULL) 232 return; 233 234 np = inet6_sk(sk); 235 236 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 237 goto out; 238 239 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 240 goto out; 241 242 if (np->recverr) 243 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 244 245 sk->sk_err = err; 246 sk->sk_error_report(sk); 247 out: 248 sock_put(sk); 249 } 250 251 static __inline__ void udpv6_err(struct sk_buff *skb, 252 struct inet6_skb_parm *opt, int type, 253 int code, int offset, __be32 info ) 254 { 255 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash); 256 } 257 258 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 259 { 260 struct udp_sock *up = udp_sk(sk); 261 int rc; 262 263 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 264 goto drop; 265 266 /* 267 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 268 */ 269 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 270 271 if (up->pcrlen == 0) { /* full coverage was set */ 272 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 273 " %d while full coverage %d requested\n", 274 UDP_SKB_CB(skb)->cscov, skb->len); 275 goto drop; 276 } 277 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 278 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 279 "too small, need min %d\n", 280 UDP_SKB_CB(skb)->cscov, up->pcrlen); 281 goto drop; 282 } 283 } 284 285 if (sk->sk_filter) { 286 if (udp_lib_checksum_complete(skb)) 287 goto drop; 288 } 289 290 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 291 /* Note that an ENOMEM error is charged twice */ 292 if (rc == -ENOMEM) 293 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag); 294 goto drop; 295 } 296 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); 297 return 0; 298 drop: 299 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag); 300 kfree_skb(skb); 301 return -1; 302 } 303 304 static struct sock *udp_v6_mcast_next(struct sock *sk, 305 __be16 loc_port, struct in6_addr *loc_addr, 306 __be16 rmt_port, struct in6_addr *rmt_addr, 307 int dif) 308 { 309 struct hlist_node *node; 310 struct sock *s = sk; 311 unsigned short num = ntohs(loc_port); 312 313 sk_for_each_from(s, node) { 314 struct inet_sock *inet = inet_sk(s); 315 316 if (s->sk_hash == num && s->sk_family == PF_INET6) { 317 struct ipv6_pinfo *np = inet6_sk(s); 318 if (inet->dport) { 319 if (inet->dport != rmt_port) 320 continue; 321 } 322 if (!ipv6_addr_any(&np->daddr) && 323 !ipv6_addr_equal(&np->daddr, rmt_addr)) 324 continue; 325 326 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 327 continue; 328 329 if (!ipv6_addr_any(&np->rcv_saddr)) { 330 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 331 continue; 332 } 333 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 334 continue; 335 return s; 336 } 337 } 338 return NULL; 339 } 340 341 /* 342 * Note: called only from the BH handler context, 343 * so we don't need to lock the hashes. 344 */ 345 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr, 346 struct in6_addr *daddr, struct hlist_head udptable[]) 347 { 348 struct sock *sk, *sk2; 349 const struct udphdr *uh = udp_hdr(skb); 350 int dif; 351 352 read_lock(&udp_hash_lock); 353 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 354 dif = inet6_iif(skb); 355 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 356 if (!sk) { 357 kfree_skb(skb); 358 goto out; 359 } 360 361 sk2 = sk; 362 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 363 uh->source, saddr, dif))) { 364 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 365 if (buff) 366 udpv6_queue_rcv_skb(sk2, buff); 367 } 368 udpv6_queue_rcv_skb(sk, skb); 369 out: 370 read_unlock(&udp_hash_lock); 371 return 0; 372 } 373 374 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 375 int proto) 376 { 377 int err; 378 379 UDP_SKB_CB(skb)->partial_cov = 0; 380 UDP_SKB_CB(skb)->cscov = skb->len; 381 382 if (proto == IPPROTO_UDPLITE) { 383 err = udplite_checksum_init(skb, uh); 384 if (err) 385 return err; 386 } 387 388 if (uh->check == 0) { 389 /* RFC 2460 section 8.1 says that we SHOULD log 390 this error. Well, it is reasonable. 391 */ 392 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 393 return 1; 394 } 395 if (skb->ip_summed == CHECKSUM_COMPLETE && 396 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 397 skb->len, proto, skb->csum)) 398 skb->ip_summed = CHECKSUM_UNNECESSARY; 399 400 if (!skb_csum_unnecessary(skb)) 401 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 402 &ipv6_hdr(skb)->daddr, 403 skb->len, proto, 0)); 404 405 return 0; 406 } 407 408 int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[], 409 int proto) 410 { 411 struct sk_buff *skb = *pskb; 412 struct sock *sk; 413 struct udphdr *uh; 414 struct net_device *dev = skb->dev; 415 struct in6_addr *saddr, *daddr; 416 u32 ulen = 0; 417 418 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 419 goto short_packet; 420 421 saddr = &ipv6_hdr(skb)->saddr; 422 daddr = &ipv6_hdr(skb)->daddr; 423 uh = udp_hdr(skb); 424 425 ulen = ntohs(uh->len); 426 if (ulen > skb->len) 427 goto short_packet; 428 429 if (proto == IPPROTO_UDP) { 430 /* UDP validates ulen. */ 431 432 /* Check for jumbo payload */ 433 if (ulen == 0) 434 ulen = skb->len; 435 436 if (ulen < sizeof(*uh)) 437 goto short_packet; 438 439 if (ulen < skb->len) { 440 if (pskb_trim_rcsum(skb, ulen)) 441 goto short_packet; 442 saddr = &ipv6_hdr(skb)->saddr; 443 daddr = &ipv6_hdr(skb)->daddr; 444 uh = udp_hdr(skb); 445 } 446 } 447 448 if (udp6_csum_init(skb, uh, proto)) 449 goto discard; 450 451 /* 452 * Multicast receive code 453 */ 454 if (ipv6_addr_is_multicast(daddr)) 455 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable); 456 457 /* Unicast */ 458 459 /* 460 * check socket cache ... must talk to Alan about his plans 461 * for sock caches... i'll skip this for now. 462 */ 463 sk = __udp6_lib_lookup(saddr, uh->source, 464 daddr, uh->dest, inet6_iif(skb), udptable); 465 466 if (sk == NULL) { 467 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 468 goto discard; 469 470 if (udp_lib_checksum_complete(skb)) 471 goto discard; 472 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 473 474 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 475 476 kfree_skb(skb); 477 return 0; 478 } 479 480 /* deliver */ 481 482 udpv6_queue_rcv_skb(sk, skb); 483 sock_put(sk); 484 return 0; 485 486 short_packet: 487 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 488 proto == IPPROTO_UDPLITE ? "-Lite" : "", 489 ulen, skb->len); 490 491 discard: 492 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 493 kfree_skb(skb); 494 return 0; 495 } 496 497 static __inline__ int udpv6_rcv(struct sk_buff **pskb) 498 { 499 return __udp6_lib_rcv(pskb, udp_hash, IPPROTO_UDP); 500 } 501 502 /* 503 * Throw away all pending data and cancel the corking. Socket is locked. 504 */ 505 static void udp_v6_flush_pending_frames(struct sock *sk) 506 { 507 struct udp_sock *up = udp_sk(sk); 508 509 if (up->pending) { 510 up->len = 0; 511 up->pending = 0; 512 ip6_flush_pending_frames(sk); 513 } 514 } 515 516 /* 517 * Sending 518 */ 519 520 static int udp_v6_push_pending_frames(struct sock *sk) 521 { 522 struct sk_buff *skb; 523 struct udphdr *uh; 524 struct udp_sock *up = udp_sk(sk); 525 struct inet_sock *inet = inet_sk(sk); 526 struct flowi *fl = &inet->cork.fl; 527 int err = 0; 528 __wsum csum = 0; 529 530 /* Grab the skbuff where UDP header space exists. */ 531 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 532 goto out; 533 534 /* 535 * Create a UDP header 536 */ 537 uh = udp_hdr(skb); 538 uh->source = fl->fl_ip_sport; 539 uh->dest = fl->fl_ip_dport; 540 uh->len = htons(up->len); 541 uh->check = 0; 542 543 if (up->pcflag) 544 csum = udplite_csum_outgoing(sk, skb); 545 else 546 csum = udp_csum_outgoing(sk, skb); 547 548 /* add protocol-dependent pseudo-header */ 549 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 550 up->len, fl->proto, csum ); 551 if (uh->check == 0) 552 uh->check = CSUM_MANGLED_0; 553 554 err = ip6_push_pending_frames(sk); 555 out: 556 up->len = 0; 557 up->pending = 0; 558 return err; 559 } 560 561 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 562 struct msghdr *msg, size_t len) 563 { 564 struct ipv6_txoptions opt_space; 565 struct udp_sock *up = udp_sk(sk); 566 struct inet_sock *inet = inet_sk(sk); 567 struct ipv6_pinfo *np = inet6_sk(sk); 568 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 569 struct in6_addr *daddr, *final_p = NULL, final; 570 struct ipv6_txoptions *opt = NULL; 571 struct ip6_flowlabel *flowlabel = NULL; 572 struct flowi fl; 573 struct dst_entry *dst; 574 int addr_len = msg->msg_namelen; 575 int ulen = len; 576 int hlimit = -1; 577 int tclass = -1; 578 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 579 int err; 580 int connected = 0; 581 int is_udplite = up->pcflag; 582 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 583 584 /* destination address check */ 585 if (sin6) { 586 if (addr_len < offsetof(struct sockaddr, sa_data)) 587 return -EINVAL; 588 589 switch (sin6->sin6_family) { 590 case AF_INET6: 591 if (addr_len < SIN6_LEN_RFC2133) 592 return -EINVAL; 593 daddr = &sin6->sin6_addr; 594 break; 595 case AF_INET: 596 goto do_udp_sendmsg; 597 case AF_UNSPEC: 598 msg->msg_name = sin6 = NULL; 599 msg->msg_namelen = addr_len = 0; 600 daddr = NULL; 601 break; 602 default: 603 return -EINVAL; 604 } 605 } else if (!up->pending) { 606 if (sk->sk_state != TCP_ESTABLISHED) 607 return -EDESTADDRREQ; 608 daddr = &np->daddr; 609 } else 610 daddr = NULL; 611 612 if (daddr) { 613 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 614 struct sockaddr_in sin; 615 sin.sin_family = AF_INET; 616 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 617 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 618 msg->msg_name = &sin; 619 msg->msg_namelen = sizeof(sin); 620 do_udp_sendmsg: 621 if (__ipv6_only_sock(sk)) 622 return -ENETUNREACH; 623 return udp_sendmsg(iocb, sk, msg, len); 624 } 625 } 626 627 if (up->pending == AF_INET) 628 return udp_sendmsg(iocb, sk, msg, len); 629 630 /* Rough check on arithmetic overflow, 631 better check is made in ip6_append_data(). 632 */ 633 if (len > INT_MAX - sizeof(struct udphdr)) 634 return -EMSGSIZE; 635 636 if (up->pending) { 637 /* 638 * There are pending frames. 639 * The socket lock must be held while it's corked. 640 */ 641 lock_sock(sk); 642 if (likely(up->pending)) { 643 if (unlikely(up->pending != AF_INET6)) { 644 release_sock(sk); 645 return -EAFNOSUPPORT; 646 } 647 dst = NULL; 648 goto do_append_data; 649 } 650 release_sock(sk); 651 } 652 ulen += sizeof(struct udphdr); 653 654 memset(&fl, 0, sizeof(fl)); 655 656 if (sin6) { 657 if (sin6->sin6_port == 0) 658 return -EINVAL; 659 660 fl.fl_ip_dport = sin6->sin6_port; 661 daddr = &sin6->sin6_addr; 662 663 if (np->sndflow) { 664 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 665 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 666 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 667 if (flowlabel == NULL) 668 return -EINVAL; 669 daddr = &flowlabel->dst; 670 } 671 } 672 673 /* 674 * Otherwise it will be difficult to maintain 675 * sk->sk_dst_cache. 676 */ 677 if (sk->sk_state == TCP_ESTABLISHED && 678 ipv6_addr_equal(daddr, &np->daddr)) 679 daddr = &np->daddr; 680 681 if (addr_len >= sizeof(struct sockaddr_in6) && 682 sin6->sin6_scope_id && 683 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 684 fl.oif = sin6->sin6_scope_id; 685 } else { 686 if (sk->sk_state != TCP_ESTABLISHED) 687 return -EDESTADDRREQ; 688 689 fl.fl_ip_dport = inet->dport; 690 daddr = &np->daddr; 691 fl.fl6_flowlabel = np->flow_label; 692 connected = 1; 693 } 694 695 if (!fl.oif) 696 fl.oif = sk->sk_bound_dev_if; 697 698 if (msg->msg_controllen) { 699 opt = &opt_space; 700 memset(opt, 0, sizeof(struct ipv6_txoptions)); 701 opt->tot_len = sizeof(*opt); 702 703 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass); 704 if (err < 0) { 705 fl6_sock_release(flowlabel); 706 return err; 707 } 708 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 709 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 710 if (flowlabel == NULL) 711 return -EINVAL; 712 } 713 if (!(opt->opt_nflen|opt->opt_flen)) 714 opt = NULL; 715 connected = 0; 716 } 717 if (opt == NULL) 718 opt = np->opt; 719 if (flowlabel) 720 opt = fl6_merge_options(&opt_space, flowlabel, opt); 721 opt = ipv6_fixup_options(&opt_space, opt); 722 723 fl.proto = sk->sk_protocol; 724 ipv6_addr_copy(&fl.fl6_dst, daddr); 725 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 726 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 727 fl.fl_ip_sport = inet->sport; 728 729 /* merge ip6_build_xmit from ip6_output */ 730 if (opt && opt->srcrt) { 731 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 732 ipv6_addr_copy(&final, &fl.fl6_dst); 733 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 734 final_p = &final; 735 connected = 0; 736 } 737 738 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 739 fl.oif = np->mcast_oif; 740 connected = 0; 741 } 742 743 security_sk_classify_flow(sk, &fl); 744 745 err = ip6_sk_dst_lookup(sk, &dst, &fl); 746 if (err) 747 goto out; 748 if (final_p) 749 ipv6_addr_copy(&fl.fl6_dst, final_p); 750 751 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) { 752 if (err == -EREMOTE) 753 err = ip6_dst_blackhole(sk, &dst, &fl); 754 if (err < 0) 755 goto out; 756 } 757 758 if (hlimit < 0) { 759 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 760 hlimit = np->mcast_hops; 761 else 762 hlimit = np->hop_limit; 763 if (hlimit < 0) 764 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 765 if (hlimit < 0) 766 hlimit = ipv6_get_hoplimit(dst->dev); 767 } 768 769 if (tclass < 0) { 770 tclass = np->tclass; 771 if (tclass < 0) 772 tclass = 0; 773 } 774 775 if (msg->msg_flags&MSG_CONFIRM) 776 goto do_confirm; 777 back_from_confirm: 778 779 lock_sock(sk); 780 if (unlikely(up->pending)) { 781 /* The socket is already corked while preparing it. */ 782 /* ... which is an evident application bug. --ANK */ 783 release_sock(sk); 784 785 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 786 err = -EINVAL; 787 goto out; 788 } 789 790 up->pending = AF_INET6; 791 792 do_append_data: 793 up->len += ulen; 794 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 795 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 796 sizeof(struct udphdr), hlimit, tclass, opt, &fl, 797 (struct rt6_info*)dst, 798 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 799 if (err) 800 udp_v6_flush_pending_frames(sk); 801 else if (!corkreq) 802 err = udp_v6_push_pending_frames(sk); 803 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 804 up->pending = 0; 805 806 if (dst) { 807 if (connected) { 808 ip6_dst_store(sk, dst, 809 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 810 &np->daddr : NULL, 811 #ifdef CONFIG_IPV6_SUBTREES 812 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 813 &np->saddr : 814 #endif 815 NULL); 816 } else { 817 dst_release(dst); 818 } 819 } 820 821 if (err > 0) 822 err = np->recverr ? net_xmit_errno(err) : 0; 823 release_sock(sk); 824 out: 825 fl6_sock_release(flowlabel); 826 if (!err) { 827 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); 828 return len; 829 } 830 /* 831 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 832 * ENOBUFS might not be good (it's not tunable per se), but otherwise 833 * we don't have a good statistic (IpOutDiscards but it can be too many 834 * things). We could add another new stat but at least for now that 835 * seems like overkill. 836 */ 837 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 838 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); 839 } 840 return err; 841 842 do_confirm: 843 dst_confirm(dst); 844 if (!(msg->msg_flags&MSG_PROBE) || len) 845 goto back_from_confirm; 846 err = 0; 847 goto out; 848 } 849 850 int udpv6_destroy_sock(struct sock *sk) 851 { 852 lock_sock(sk); 853 udp_v6_flush_pending_frames(sk); 854 release_sock(sk); 855 856 inet6_destroy_sock(sk); 857 858 return 0; 859 } 860 861 /* 862 * Socket option code for UDP 863 */ 864 int udpv6_setsockopt(struct sock *sk, int level, int optname, 865 char __user *optval, int optlen) 866 { 867 if (level == SOL_UDP || level == SOL_UDPLITE) 868 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 869 udp_v6_push_pending_frames); 870 return ipv6_setsockopt(sk, level, optname, optval, optlen); 871 } 872 873 #ifdef CONFIG_COMPAT 874 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 875 char __user *optval, int optlen) 876 { 877 if (level == SOL_UDP || level == SOL_UDPLITE) 878 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 879 udp_v6_push_pending_frames); 880 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 881 } 882 #endif 883 884 int udpv6_getsockopt(struct sock *sk, int level, int optname, 885 char __user *optval, int __user *optlen) 886 { 887 if (level == SOL_UDP || level == SOL_UDPLITE) 888 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 889 return ipv6_getsockopt(sk, level, optname, optval, optlen); 890 } 891 892 #ifdef CONFIG_COMPAT 893 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 894 char __user *optval, int __user *optlen) 895 { 896 if (level == SOL_UDP || level == SOL_UDPLITE) 897 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 898 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 899 } 900 #endif 901 902 static struct inet6_protocol udpv6_protocol = { 903 .handler = udpv6_rcv, 904 .err_handler = udpv6_err, 905 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 906 }; 907 908 /* ------------------------------------------------------------------------ */ 909 #ifdef CONFIG_PROC_FS 910 911 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 912 { 913 struct inet_sock *inet = inet_sk(sp); 914 struct ipv6_pinfo *np = inet6_sk(sp); 915 struct in6_addr *dest, *src; 916 __u16 destp, srcp; 917 918 dest = &np->daddr; 919 src = &np->rcv_saddr; 920 destp = ntohs(inet->dport); 921 srcp = ntohs(inet->sport); 922 seq_printf(seq, 923 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 924 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 925 bucket, 926 src->s6_addr32[0], src->s6_addr32[1], 927 src->s6_addr32[2], src->s6_addr32[3], srcp, 928 dest->s6_addr32[0], dest->s6_addr32[1], 929 dest->s6_addr32[2], dest->s6_addr32[3], destp, 930 sp->sk_state, 931 atomic_read(&sp->sk_wmem_alloc), 932 atomic_read(&sp->sk_rmem_alloc), 933 0, 0L, 0, 934 sock_i_uid(sp), 0, 935 sock_i_ino(sp), 936 atomic_read(&sp->sk_refcnt), sp); 937 } 938 939 int udp6_seq_show(struct seq_file *seq, void *v) 940 { 941 if (v == SEQ_START_TOKEN) 942 seq_printf(seq, 943 " sl " 944 "local_address " 945 "remote_address " 946 "st tx_queue rx_queue tr tm->when retrnsmt" 947 " uid timeout inode\n"); 948 else 949 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 950 return 0; 951 } 952 953 static struct file_operations udp6_seq_fops; 954 static struct udp_seq_afinfo udp6_seq_afinfo = { 955 .owner = THIS_MODULE, 956 .name = "udp6", 957 .family = AF_INET6, 958 .hashtable = udp_hash, 959 .seq_show = udp6_seq_show, 960 .seq_fops = &udp6_seq_fops, 961 }; 962 963 int __init udp6_proc_init(void) 964 { 965 return udp_proc_register(&udp6_seq_afinfo); 966 } 967 968 void udp6_proc_exit(void) { 969 udp_proc_unregister(&udp6_seq_afinfo); 970 } 971 #endif /* CONFIG_PROC_FS */ 972 973 /* ------------------------------------------------------------------------ */ 974 975 struct proto udpv6_prot = { 976 .name = "UDPv6", 977 .owner = THIS_MODULE, 978 .close = udp_lib_close, 979 .connect = ip6_datagram_connect, 980 .disconnect = udp_disconnect, 981 .ioctl = udp_ioctl, 982 .destroy = udpv6_destroy_sock, 983 .setsockopt = udpv6_setsockopt, 984 .getsockopt = udpv6_getsockopt, 985 .sendmsg = udpv6_sendmsg, 986 .recvmsg = udpv6_recvmsg, 987 .backlog_rcv = udpv6_queue_rcv_skb, 988 .hash = udp_lib_hash, 989 .unhash = udp_lib_unhash, 990 .get_port = udp_v6_get_port, 991 .obj_size = sizeof(struct udp6_sock), 992 #ifdef CONFIG_COMPAT 993 .compat_setsockopt = compat_udpv6_setsockopt, 994 .compat_getsockopt = compat_udpv6_getsockopt, 995 #endif 996 }; 997 998 static struct inet_protosw udpv6_protosw = { 999 .type = SOCK_DGRAM, 1000 .protocol = IPPROTO_UDP, 1001 .prot = &udpv6_prot, 1002 .ops = &inet6_dgram_ops, 1003 .capability =-1, 1004 .no_check = UDP_CSUM_DEFAULT, 1005 .flags = INET_PROTOSW_PERMANENT, 1006 }; 1007 1008 1009 void __init udpv6_init(void) 1010 { 1011 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1012 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1013 inet6_register_protosw(&udpv6_protosw); 1014 } 1015