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 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite); 209 skb_kill_datagram(sk, skb, flags); 210 211 if (flags & MSG_DONTWAIT) 212 return -EAGAIN; 213 goto try_again; 214 } 215 216 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 217 int type, int code, int offset, __be32 info, 218 struct hlist_head udptable[] ) 219 { 220 struct ipv6_pinfo *np; 221 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 222 struct in6_addr *saddr = &hdr->saddr; 223 struct in6_addr *daddr = &hdr->daddr; 224 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 225 struct sock *sk; 226 int err; 227 228 sk = __udp6_lib_lookup(daddr, uh->dest, 229 saddr, uh->source, inet6_iif(skb), udptable); 230 if (sk == NULL) 231 return; 232 233 np = inet6_sk(sk); 234 235 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 236 goto out; 237 238 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 239 goto out; 240 241 if (np->recverr) 242 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 243 244 sk->sk_err = err; 245 sk->sk_error_report(sk); 246 out: 247 sock_put(sk); 248 } 249 250 static __inline__ void udpv6_err(struct sk_buff *skb, 251 struct inet6_skb_parm *opt, int type, 252 int code, int offset, __be32 info ) 253 { 254 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash); 255 } 256 257 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 258 { 259 struct udp_sock *up = udp_sk(sk); 260 int rc; 261 262 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 263 goto drop; 264 265 /* 266 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 267 */ 268 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 269 270 if (up->pcrlen == 0) { /* full coverage was set */ 271 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 272 " %d while full coverage %d requested\n", 273 UDP_SKB_CB(skb)->cscov, skb->len); 274 goto drop; 275 } 276 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 277 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 278 "too small, need min %d\n", 279 UDP_SKB_CB(skb)->cscov, up->pcrlen); 280 goto drop; 281 } 282 } 283 284 if (sk->sk_filter) { 285 if (udp_lib_checksum_complete(skb)) 286 goto drop; 287 } 288 289 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 290 /* Note that an ENOMEM error is charged twice */ 291 if (rc == -ENOMEM) 292 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag); 293 goto drop; 294 } 295 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); 296 return 0; 297 drop: 298 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag); 299 kfree_skb(skb); 300 return -1; 301 } 302 303 static struct sock *udp_v6_mcast_next(struct sock *sk, 304 __be16 loc_port, struct in6_addr *loc_addr, 305 __be16 rmt_port, struct in6_addr *rmt_addr, 306 int dif) 307 { 308 struct hlist_node *node; 309 struct sock *s = sk; 310 unsigned short num = ntohs(loc_port); 311 312 sk_for_each_from(s, node) { 313 struct inet_sock *inet = inet_sk(s); 314 315 if (s->sk_hash == num && s->sk_family == PF_INET6) { 316 struct ipv6_pinfo *np = inet6_sk(s); 317 if (inet->dport) { 318 if (inet->dport != rmt_port) 319 continue; 320 } 321 if (!ipv6_addr_any(&np->daddr) && 322 !ipv6_addr_equal(&np->daddr, rmt_addr)) 323 continue; 324 325 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 326 continue; 327 328 if (!ipv6_addr_any(&np->rcv_saddr)) { 329 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 330 continue; 331 } 332 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 333 continue; 334 return s; 335 } 336 } 337 return NULL; 338 } 339 340 /* 341 * Note: called only from the BH handler context, 342 * so we don't need to lock the hashes. 343 */ 344 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr, 345 struct in6_addr *daddr, struct hlist_head udptable[]) 346 { 347 struct sock *sk, *sk2; 348 const struct udphdr *uh = udp_hdr(skb); 349 int dif; 350 351 read_lock(&udp_hash_lock); 352 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 353 dif = inet6_iif(skb); 354 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 355 if (!sk) { 356 kfree_skb(skb); 357 goto out; 358 } 359 360 sk2 = sk; 361 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 362 uh->source, saddr, dif))) { 363 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 364 if (buff) 365 udpv6_queue_rcv_skb(sk2, buff); 366 } 367 udpv6_queue_rcv_skb(sk, skb); 368 out: 369 read_unlock(&udp_hash_lock); 370 return 0; 371 } 372 373 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 374 int proto) 375 { 376 int err; 377 378 UDP_SKB_CB(skb)->partial_cov = 0; 379 UDP_SKB_CB(skb)->cscov = skb->len; 380 381 if (proto == IPPROTO_UDPLITE) { 382 err = udplite_checksum_init(skb, uh); 383 if (err) 384 return err; 385 } 386 387 if (uh->check == 0) { 388 /* RFC 2460 section 8.1 says that we SHOULD log 389 this error. Well, it is reasonable. 390 */ 391 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 392 return 1; 393 } 394 if (skb->ip_summed == CHECKSUM_COMPLETE && 395 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 396 skb->len, proto, skb->csum)) 397 skb->ip_summed = CHECKSUM_UNNECESSARY; 398 399 if (!skb_csum_unnecessary(skb)) 400 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 401 &ipv6_hdr(skb)->daddr, 402 skb->len, proto, 0)); 403 404 return 0; 405 } 406 407 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], 408 int proto) 409 { 410 struct sock *sk; 411 struct udphdr *uh; 412 struct net_device *dev = skb->dev; 413 struct in6_addr *saddr, *daddr; 414 u32 ulen = 0; 415 416 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 417 goto short_packet; 418 419 saddr = &ipv6_hdr(skb)->saddr; 420 daddr = &ipv6_hdr(skb)->daddr; 421 uh = udp_hdr(skb); 422 423 ulen = ntohs(uh->len); 424 if (ulen > skb->len) 425 goto short_packet; 426 427 if (proto == IPPROTO_UDP) { 428 /* UDP validates ulen. */ 429 430 /* Check for jumbo payload */ 431 if (ulen == 0) 432 ulen = skb->len; 433 434 if (ulen < sizeof(*uh)) 435 goto short_packet; 436 437 if (ulen < skb->len) { 438 if (pskb_trim_rcsum(skb, ulen)) 439 goto short_packet; 440 saddr = &ipv6_hdr(skb)->saddr; 441 daddr = &ipv6_hdr(skb)->daddr; 442 uh = udp_hdr(skb); 443 } 444 } 445 446 if (udp6_csum_init(skb, uh, proto)) 447 goto discard; 448 449 /* 450 * Multicast receive code 451 */ 452 if (ipv6_addr_is_multicast(daddr)) 453 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable); 454 455 /* Unicast */ 456 457 /* 458 * check socket cache ... must talk to Alan about his plans 459 * for sock caches... i'll skip this for now. 460 */ 461 sk = __udp6_lib_lookup(saddr, uh->source, 462 daddr, uh->dest, inet6_iif(skb), udptable); 463 464 if (sk == NULL) { 465 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 466 goto discard; 467 468 if (udp_lib_checksum_complete(skb)) 469 goto discard; 470 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 471 472 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 473 474 kfree_skb(skb); 475 return 0; 476 } 477 478 /* deliver */ 479 480 udpv6_queue_rcv_skb(sk, skb); 481 sock_put(sk); 482 return 0; 483 484 short_packet: 485 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 486 proto == IPPROTO_UDPLITE ? "-Lite" : "", 487 ulen, skb->len); 488 489 discard: 490 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 491 kfree_skb(skb); 492 return 0; 493 } 494 495 static __inline__ int udpv6_rcv(struct sk_buff *skb) 496 { 497 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP); 498 } 499 500 /* 501 * Throw away all pending data and cancel the corking. Socket is locked. 502 */ 503 static void udp_v6_flush_pending_frames(struct sock *sk) 504 { 505 struct udp_sock *up = udp_sk(sk); 506 507 if (up->pending) { 508 up->len = 0; 509 up->pending = 0; 510 ip6_flush_pending_frames(sk); 511 } 512 } 513 514 /* 515 * Sending 516 */ 517 518 static int udp_v6_push_pending_frames(struct sock *sk) 519 { 520 struct sk_buff *skb; 521 struct udphdr *uh; 522 struct udp_sock *up = udp_sk(sk); 523 struct inet_sock *inet = inet_sk(sk); 524 struct flowi *fl = &inet->cork.fl; 525 int err = 0; 526 __wsum csum = 0; 527 528 /* Grab the skbuff where UDP header space exists. */ 529 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 530 goto out; 531 532 /* 533 * Create a UDP header 534 */ 535 uh = udp_hdr(skb); 536 uh->source = fl->fl_ip_sport; 537 uh->dest = fl->fl_ip_dport; 538 uh->len = htons(up->len); 539 uh->check = 0; 540 541 if (up->pcflag) 542 csum = udplite_csum_outgoing(sk, skb); 543 else 544 csum = udp_csum_outgoing(sk, skb); 545 546 /* add protocol-dependent pseudo-header */ 547 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 548 up->len, fl->proto, csum ); 549 if (uh->check == 0) 550 uh->check = CSUM_MANGLED_0; 551 552 err = ip6_push_pending_frames(sk); 553 out: 554 up->len = 0; 555 up->pending = 0; 556 if (!err) 557 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, up->pcflag); 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_v4mapped(daddr)) { 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 return len; 828 /* 829 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 830 * ENOBUFS might not be good (it's not tunable per se), but otherwise 831 * we don't have a good statistic (IpOutDiscards but it can be too many 832 * things). We could add another new stat but at least for now that 833 * seems like overkill. 834 */ 835 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 836 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); 837 } 838 return err; 839 840 do_confirm: 841 dst_confirm(dst); 842 if (!(msg->msg_flags&MSG_PROBE) || len) 843 goto back_from_confirm; 844 err = 0; 845 goto out; 846 } 847 848 int udpv6_destroy_sock(struct sock *sk) 849 { 850 lock_sock(sk); 851 udp_v6_flush_pending_frames(sk); 852 release_sock(sk); 853 854 inet6_destroy_sock(sk); 855 856 return 0; 857 } 858 859 /* 860 * Socket option code for UDP 861 */ 862 int udpv6_setsockopt(struct sock *sk, int level, int optname, 863 char __user *optval, int optlen) 864 { 865 if (level == SOL_UDP || level == SOL_UDPLITE) 866 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 867 udp_v6_push_pending_frames); 868 return ipv6_setsockopt(sk, level, optname, optval, optlen); 869 } 870 871 #ifdef CONFIG_COMPAT 872 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 873 char __user *optval, int optlen) 874 { 875 if (level == SOL_UDP || level == SOL_UDPLITE) 876 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 877 udp_v6_push_pending_frames); 878 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 879 } 880 #endif 881 882 int udpv6_getsockopt(struct sock *sk, int level, int optname, 883 char __user *optval, int __user *optlen) 884 { 885 if (level == SOL_UDP || level == SOL_UDPLITE) 886 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 887 return ipv6_getsockopt(sk, level, optname, optval, optlen); 888 } 889 890 #ifdef CONFIG_COMPAT 891 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 892 char __user *optval, int __user *optlen) 893 { 894 if (level == SOL_UDP || level == SOL_UDPLITE) 895 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 896 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 897 } 898 #endif 899 900 static struct inet6_protocol udpv6_protocol = { 901 .handler = udpv6_rcv, 902 .err_handler = udpv6_err, 903 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 904 }; 905 906 /* ------------------------------------------------------------------------ */ 907 #ifdef CONFIG_PROC_FS 908 909 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 910 { 911 struct inet_sock *inet = inet_sk(sp); 912 struct ipv6_pinfo *np = inet6_sk(sp); 913 struct in6_addr *dest, *src; 914 __u16 destp, srcp; 915 916 dest = &np->daddr; 917 src = &np->rcv_saddr; 918 destp = ntohs(inet->dport); 919 srcp = ntohs(inet->sport); 920 seq_printf(seq, 921 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 922 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 923 bucket, 924 src->s6_addr32[0], src->s6_addr32[1], 925 src->s6_addr32[2], src->s6_addr32[3], srcp, 926 dest->s6_addr32[0], dest->s6_addr32[1], 927 dest->s6_addr32[2], dest->s6_addr32[3], destp, 928 sp->sk_state, 929 atomic_read(&sp->sk_wmem_alloc), 930 atomic_read(&sp->sk_rmem_alloc), 931 0, 0L, 0, 932 sock_i_uid(sp), 0, 933 sock_i_ino(sp), 934 atomic_read(&sp->sk_refcnt), sp); 935 } 936 937 int udp6_seq_show(struct seq_file *seq, void *v) 938 { 939 if (v == SEQ_START_TOKEN) 940 seq_printf(seq, 941 " sl " 942 "local_address " 943 "remote_address " 944 "st tx_queue rx_queue tr tm->when retrnsmt" 945 " uid timeout inode\n"); 946 else 947 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 948 return 0; 949 } 950 951 static struct file_operations udp6_seq_fops; 952 static struct udp_seq_afinfo udp6_seq_afinfo = { 953 .owner = THIS_MODULE, 954 .name = "udp6", 955 .family = AF_INET6, 956 .hashtable = udp_hash, 957 .seq_show = udp6_seq_show, 958 .seq_fops = &udp6_seq_fops, 959 }; 960 961 int __init udp6_proc_init(void) 962 { 963 return udp_proc_register(&udp6_seq_afinfo); 964 } 965 966 void udp6_proc_exit(void) { 967 udp_proc_unregister(&udp6_seq_afinfo); 968 } 969 #endif /* CONFIG_PROC_FS */ 970 971 /* ------------------------------------------------------------------------ */ 972 973 DEFINE_PROTO_INUSE(udpv6) 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 REF_PROTO_INUSE(udpv6) 997 }; 998 999 static struct inet_protosw udpv6_protosw = { 1000 .type = SOCK_DGRAM, 1001 .protocol = IPPROTO_UDP, 1002 .prot = &udpv6_prot, 1003 .ops = &inet6_dgram_ops, 1004 .capability =-1, 1005 .no_check = UDP_CSUM_DEFAULT, 1006 .flags = INET_PROTOSW_PERMANENT, 1007 }; 1008 1009 1010 void __init udpv6_init(void) 1011 { 1012 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 1013 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 1014 inet6_register_protosw(&udpv6_protosw); 1015 } 1016