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/module.h> 38 #include <linux/skbuff.h> 39 #include <asm/uaccess.h> 40 41 #include <net/ndisc.h> 42 #include <net/protocol.h> 43 #include <net/transp_v6.h> 44 #include <net/ip6_route.h> 45 #include <net/raw.h> 46 #include <net/tcp_states.h> 47 #include <net/ip6_checksum.h> 48 #include <net/xfrm.h> 49 50 #include <linux/proc_fs.h> 51 #include <linux/seq_file.h> 52 #include "udp_impl.h" 53 54 static inline int udp_v6_get_port(struct sock *sk, unsigned short snum) 55 { 56 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal); 57 } 58 59 static struct sock *__udp6_lib_lookup(struct net *net, 60 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_net == net && sk->sk_hash == hnum && 74 sk->sk_family == PF_INET6) { 75 struct ipv6_pinfo *np = inet6_sk(sk); 76 int score = 0; 77 if (inet->dport) { 78 if (inet->dport != sport) 79 continue; 80 score++; 81 } 82 if (!ipv6_addr_any(&np->rcv_saddr)) { 83 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 84 continue; 85 score++; 86 } 87 if (!ipv6_addr_any(&np->daddr)) { 88 if (!ipv6_addr_equal(&np->daddr, saddr)) 89 continue; 90 score++; 91 } 92 if (sk->sk_bound_dev_if) { 93 if (sk->sk_bound_dev_if != dif) 94 continue; 95 score++; 96 } 97 if (score == 4) { 98 result = sk; 99 break; 100 } else if (score > badness) { 101 result = sk; 102 badness = score; 103 } 104 } 105 } 106 if (result) 107 sock_hold(result); 108 read_unlock(&udp_hash_lock); 109 return result; 110 } 111 112 /* 113 * This should be easy, if there is something there we 114 * return it, otherwise we block. 115 */ 116 117 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 118 struct msghdr *msg, size_t len, 119 int noblock, int flags, int *addr_len) 120 { 121 struct ipv6_pinfo *np = inet6_sk(sk); 122 struct inet_sock *inet = inet_sk(sk); 123 struct sk_buff *skb; 124 unsigned int ulen, copied; 125 int peeked; 126 int err; 127 int is_udplite = IS_UDPLITE(sk); 128 129 if (addr_len) 130 *addr_len=sizeof(struct sockaddr_in6); 131 132 if (flags & MSG_ERRQUEUE) 133 return ipv6_recv_error(sk, msg, len); 134 135 try_again: 136 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 137 &peeked, &err); 138 if (!skb) 139 goto out; 140 141 ulen = skb->len - sizeof(struct udphdr); 142 copied = len; 143 if (copied > ulen) 144 copied = ulen; 145 else if (copied < ulen) 146 msg->msg_flags |= MSG_TRUNC; 147 148 /* 149 * If checksum is needed at all, try to do it while copying the 150 * data. If the data is truncated, or if we only want a partial 151 * coverage checksum (UDP-Lite), do it before the copy. 152 */ 153 154 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 155 if (udp_lib_checksum_complete(skb)) 156 goto csum_copy_err; 157 } 158 159 if (skb_csum_unnecessary(skb)) 160 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 161 msg->msg_iov, copied ); 162 else { 163 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 164 if (err == -EINVAL) 165 goto csum_copy_err; 166 } 167 if (err) 168 goto out_free; 169 170 if (!peeked) 171 UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite); 172 173 sock_recv_timestamp(msg, sk, skb); 174 175 /* Copy the address. */ 176 if (msg->msg_name) { 177 struct sockaddr_in6 *sin6; 178 179 sin6 = (struct sockaddr_in6 *) msg->msg_name; 180 sin6->sin6_family = AF_INET6; 181 sin6->sin6_port = udp_hdr(skb)->source; 182 sin6->sin6_flowinfo = 0; 183 sin6->sin6_scope_id = 0; 184 185 if (skb->protocol == htons(ETH_P_IP)) 186 ipv6_addr_set(&sin6->sin6_addr, 0, 0, 187 htonl(0xffff), ip_hdr(skb)->saddr); 188 else { 189 ipv6_addr_copy(&sin6->sin6_addr, 190 &ipv6_hdr(skb)->saddr); 191 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 192 sin6->sin6_scope_id = IP6CB(skb)->iif; 193 } 194 195 } 196 if (skb->protocol == htons(ETH_P_IP)) { 197 if (inet->cmsg_flags) 198 ip_cmsg_recv(msg, skb); 199 } else { 200 if (np->rxopt.all) 201 datagram_recv_ctl(sk, msg, skb); 202 } 203 204 err = copied; 205 if (flags & MSG_TRUNC) 206 err = ulen; 207 208 out_free: 209 lock_sock(sk); 210 skb_free_datagram(sk, skb); 211 release_sock(sk); 212 out: 213 return err; 214 215 csum_copy_err: 216 lock_sock(sk); 217 if (!skb_kill_datagram(sk, skb, flags)) 218 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite); 219 release_sock(sk); 220 221 if (flags & MSG_DONTWAIT) 222 return -EAGAIN; 223 goto try_again; 224 } 225 226 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 227 int type, int code, int offset, __be32 info, 228 struct hlist_head udptable[] ) 229 { 230 struct ipv6_pinfo *np; 231 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 232 struct in6_addr *saddr = &hdr->saddr; 233 struct in6_addr *daddr = &hdr->daddr; 234 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 235 struct sock *sk; 236 int err; 237 238 sk = __udp6_lib_lookup(skb->dev->nd_net, daddr, uh->dest, 239 saddr, uh->source, inet6_iif(skb), udptable); 240 if (sk == NULL) 241 return; 242 243 np = inet6_sk(sk); 244 245 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 246 goto out; 247 248 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 249 goto out; 250 251 if (np->recverr) 252 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 253 254 sk->sk_err = err; 255 sk->sk_error_report(sk); 256 out: 257 sock_put(sk); 258 } 259 260 static __inline__ void udpv6_err(struct sk_buff *skb, 261 struct inet6_skb_parm *opt, int type, 262 int code, int offset, __be32 info ) 263 { 264 __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash); 265 } 266 267 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 268 { 269 struct udp_sock *up = udp_sk(sk); 270 int rc; 271 int is_udplite = IS_UDPLITE(sk); 272 273 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 274 goto drop; 275 276 /* 277 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 278 */ 279 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 280 281 if (up->pcrlen == 0) { /* full coverage was set */ 282 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 283 " %d while full coverage %d requested\n", 284 UDP_SKB_CB(skb)->cscov, skb->len); 285 goto drop; 286 } 287 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 288 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 289 "too small, need min %d\n", 290 UDP_SKB_CB(skb)->cscov, up->pcrlen); 291 goto drop; 292 } 293 } 294 295 if (sk->sk_filter) { 296 if (udp_lib_checksum_complete(skb)) 297 goto drop; 298 } 299 300 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 301 /* Note that an ENOMEM error is charged twice */ 302 if (rc == -ENOMEM) 303 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite); 304 goto drop; 305 } 306 307 return 0; 308 drop: 309 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite); 310 kfree_skb(skb); 311 return -1; 312 } 313 314 static struct sock *udp_v6_mcast_next(struct sock *sk, 315 __be16 loc_port, struct in6_addr *loc_addr, 316 __be16 rmt_port, struct in6_addr *rmt_addr, 317 int dif) 318 { 319 struct hlist_node *node; 320 struct sock *s = sk; 321 unsigned short num = ntohs(loc_port); 322 323 sk_for_each_from(s, node) { 324 struct inet_sock *inet = inet_sk(s); 325 326 if (s->sk_hash == num && s->sk_family == PF_INET6) { 327 struct ipv6_pinfo *np = inet6_sk(s); 328 if (inet->dport) { 329 if (inet->dport != rmt_port) 330 continue; 331 } 332 if (!ipv6_addr_any(&np->daddr) && 333 !ipv6_addr_equal(&np->daddr, rmt_addr)) 334 continue; 335 336 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 337 continue; 338 339 if (!ipv6_addr_any(&np->rcv_saddr)) { 340 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 341 continue; 342 } 343 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 344 continue; 345 return s; 346 } 347 } 348 return NULL; 349 } 350 351 /* 352 * Note: called only from the BH handler context, 353 * so we don't need to lock the hashes. 354 */ 355 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr, 356 struct in6_addr *daddr, struct hlist_head udptable[]) 357 { 358 struct sock *sk, *sk2; 359 const struct udphdr *uh = udp_hdr(skb); 360 int dif; 361 362 read_lock(&udp_hash_lock); 363 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 364 dif = inet6_iif(skb); 365 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 366 if (!sk) { 367 kfree_skb(skb); 368 goto out; 369 } 370 371 sk2 = sk; 372 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 373 uh->source, saddr, dif))) { 374 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 375 if (buff) { 376 bh_lock_sock_nested(sk2); 377 if (!sock_owned_by_user(sk2)) 378 udpv6_queue_rcv_skb(sk2, buff); 379 else 380 sk_add_backlog(sk2, buff); 381 bh_unlock_sock(sk2); 382 } 383 } 384 bh_lock_sock_nested(sk); 385 if (!sock_owned_by_user(sk)) 386 udpv6_queue_rcv_skb(sk, skb); 387 else 388 sk_add_backlog(sk, skb); 389 bh_unlock_sock(sk); 390 out: 391 read_unlock(&udp_hash_lock); 392 return 0; 393 } 394 395 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 396 int proto) 397 { 398 int err; 399 400 UDP_SKB_CB(skb)->partial_cov = 0; 401 UDP_SKB_CB(skb)->cscov = skb->len; 402 403 if (proto == IPPROTO_UDPLITE) { 404 err = udplite_checksum_init(skb, uh); 405 if (err) 406 return err; 407 } 408 409 if (uh->check == 0) { 410 /* RFC 2460 section 8.1 says that we SHOULD log 411 this error. Well, it is reasonable. 412 */ 413 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 414 return 1; 415 } 416 if (skb->ip_summed == CHECKSUM_COMPLETE && 417 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 418 skb->len, proto, skb->csum)) 419 skb->ip_summed = CHECKSUM_UNNECESSARY; 420 421 if (!skb_csum_unnecessary(skb)) 422 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 423 &ipv6_hdr(skb)->daddr, 424 skb->len, proto, 0)); 425 426 return 0; 427 } 428 429 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], 430 int proto) 431 { 432 struct sock *sk; 433 struct udphdr *uh; 434 struct net_device *dev = skb->dev; 435 struct in6_addr *saddr, *daddr; 436 u32 ulen = 0; 437 438 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 439 goto short_packet; 440 441 saddr = &ipv6_hdr(skb)->saddr; 442 daddr = &ipv6_hdr(skb)->daddr; 443 uh = udp_hdr(skb); 444 445 ulen = ntohs(uh->len); 446 if (ulen > skb->len) 447 goto short_packet; 448 449 if (proto == IPPROTO_UDP) { 450 /* UDP validates ulen. */ 451 452 /* Check for jumbo payload */ 453 if (ulen == 0) 454 ulen = skb->len; 455 456 if (ulen < sizeof(*uh)) 457 goto short_packet; 458 459 if (ulen < skb->len) { 460 if (pskb_trim_rcsum(skb, ulen)) 461 goto short_packet; 462 saddr = &ipv6_hdr(skb)->saddr; 463 daddr = &ipv6_hdr(skb)->daddr; 464 uh = udp_hdr(skb); 465 } 466 } 467 468 if (udp6_csum_init(skb, uh, proto)) 469 goto discard; 470 471 /* 472 * Multicast receive code 473 */ 474 if (ipv6_addr_is_multicast(daddr)) 475 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable); 476 477 /* Unicast */ 478 479 /* 480 * check socket cache ... must talk to Alan about his plans 481 * for sock caches... i'll skip this for now. 482 */ 483 sk = __udp6_lib_lookup(skb->dev->nd_net, saddr, uh->source, 484 daddr, uh->dest, inet6_iif(skb), udptable); 485 486 if (sk == NULL) { 487 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 488 goto discard; 489 490 if (udp_lib_checksum_complete(skb)) 491 goto discard; 492 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); 493 494 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 495 496 kfree_skb(skb); 497 return 0; 498 } 499 500 /* deliver */ 501 502 bh_lock_sock_nested(sk); 503 if (!sock_owned_by_user(sk)) 504 udpv6_queue_rcv_skb(sk, skb); 505 else 506 sk_add_backlog(sk, skb); 507 bh_unlock_sock(sk); 508 sock_put(sk); 509 return 0; 510 511 short_packet: 512 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 513 proto == IPPROTO_UDPLITE ? "-Lite" : "", 514 ulen, skb->len); 515 516 discard: 517 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 518 kfree_skb(skb); 519 return 0; 520 } 521 522 static __inline__ int udpv6_rcv(struct sk_buff *skb) 523 { 524 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP); 525 } 526 527 /* 528 * Throw away all pending data and cancel the corking. Socket is locked. 529 */ 530 static void udp_v6_flush_pending_frames(struct sock *sk) 531 { 532 struct udp_sock *up = udp_sk(sk); 533 534 if (up->pending) { 535 up->len = 0; 536 up->pending = 0; 537 ip6_flush_pending_frames(sk); 538 } 539 } 540 541 /* 542 * Sending 543 */ 544 545 static int udp_v6_push_pending_frames(struct sock *sk) 546 { 547 struct sk_buff *skb; 548 struct udphdr *uh; 549 struct udp_sock *up = udp_sk(sk); 550 struct inet_sock *inet = inet_sk(sk); 551 struct flowi *fl = &inet->cork.fl; 552 int err = 0; 553 int is_udplite = IS_UDPLITE(sk); 554 __wsum csum = 0; 555 556 /* Grab the skbuff where UDP header space exists. */ 557 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 558 goto out; 559 560 /* 561 * Create a UDP header 562 */ 563 uh = udp_hdr(skb); 564 uh->source = fl->fl_ip_sport; 565 uh->dest = fl->fl_ip_dport; 566 uh->len = htons(up->len); 567 uh->check = 0; 568 569 if (is_udplite) 570 csum = udplite_csum_outgoing(sk, skb); 571 else 572 csum = udp_csum_outgoing(sk, skb); 573 574 /* add protocol-dependent pseudo-header */ 575 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 576 up->len, fl->proto, csum ); 577 if (uh->check == 0) 578 uh->check = CSUM_MANGLED_0; 579 580 err = ip6_push_pending_frames(sk); 581 out: 582 up->len = 0; 583 up->pending = 0; 584 if (!err) 585 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); 586 return err; 587 } 588 589 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 590 struct msghdr *msg, size_t len) 591 { 592 struct ipv6_txoptions opt_space; 593 struct udp_sock *up = udp_sk(sk); 594 struct inet_sock *inet = inet_sk(sk); 595 struct ipv6_pinfo *np = inet6_sk(sk); 596 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 597 struct in6_addr *daddr, *final_p = NULL, final; 598 struct ipv6_txoptions *opt = NULL; 599 struct ip6_flowlabel *flowlabel = NULL; 600 struct flowi fl; 601 struct dst_entry *dst; 602 int addr_len = msg->msg_namelen; 603 int ulen = len; 604 int hlimit = -1; 605 int tclass = -1; 606 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 607 int err; 608 int connected = 0; 609 int is_udplite = IS_UDPLITE(sk); 610 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 611 612 /* destination address check */ 613 if (sin6) { 614 if (addr_len < offsetof(struct sockaddr, sa_data)) 615 return -EINVAL; 616 617 switch (sin6->sin6_family) { 618 case AF_INET6: 619 if (addr_len < SIN6_LEN_RFC2133) 620 return -EINVAL; 621 daddr = &sin6->sin6_addr; 622 break; 623 case AF_INET: 624 goto do_udp_sendmsg; 625 case AF_UNSPEC: 626 msg->msg_name = sin6 = NULL; 627 msg->msg_namelen = addr_len = 0; 628 daddr = NULL; 629 break; 630 default: 631 return -EINVAL; 632 } 633 } else if (!up->pending) { 634 if (sk->sk_state != TCP_ESTABLISHED) 635 return -EDESTADDRREQ; 636 daddr = &np->daddr; 637 } else 638 daddr = NULL; 639 640 if (daddr) { 641 if (ipv6_addr_v4mapped(daddr)) { 642 struct sockaddr_in sin; 643 sin.sin_family = AF_INET; 644 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 645 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 646 msg->msg_name = &sin; 647 msg->msg_namelen = sizeof(sin); 648 do_udp_sendmsg: 649 if (__ipv6_only_sock(sk)) 650 return -ENETUNREACH; 651 return udp_sendmsg(iocb, sk, msg, len); 652 } 653 } 654 655 if (up->pending == AF_INET) 656 return udp_sendmsg(iocb, sk, msg, len); 657 658 /* Rough check on arithmetic overflow, 659 better check is made in ip6_append_data(). 660 */ 661 if (len > INT_MAX - sizeof(struct udphdr)) 662 return -EMSGSIZE; 663 664 if (up->pending) { 665 /* 666 * There are pending frames. 667 * The socket lock must be held while it's corked. 668 */ 669 lock_sock(sk); 670 if (likely(up->pending)) { 671 if (unlikely(up->pending != AF_INET6)) { 672 release_sock(sk); 673 return -EAFNOSUPPORT; 674 } 675 dst = NULL; 676 goto do_append_data; 677 } 678 release_sock(sk); 679 } 680 ulen += sizeof(struct udphdr); 681 682 memset(&fl, 0, sizeof(fl)); 683 684 if (sin6) { 685 if (sin6->sin6_port == 0) 686 return -EINVAL; 687 688 fl.fl_ip_dport = sin6->sin6_port; 689 daddr = &sin6->sin6_addr; 690 691 if (np->sndflow) { 692 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 693 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 694 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 695 if (flowlabel == NULL) 696 return -EINVAL; 697 daddr = &flowlabel->dst; 698 } 699 } 700 701 /* 702 * Otherwise it will be difficult to maintain 703 * sk->sk_dst_cache. 704 */ 705 if (sk->sk_state == TCP_ESTABLISHED && 706 ipv6_addr_equal(daddr, &np->daddr)) 707 daddr = &np->daddr; 708 709 if (addr_len >= sizeof(struct sockaddr_in6) && 710 sin6->sin6_scope_id && 711 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 712 fl.oif = sin6->sin6_scope_id; 713 } else { 714 if (sk->sk_state != TCP_ESTABLISHED) 715 return -EDESTADDRREQ; 716 717 fl.fl_ip_dport = inet->dport; 718 daddr = &np->daddr; 719 fl.fl6_flowlabel = np->flow_label; 720 connected = 1; 721 } 722 723 if (!fl.oif) 724 fl.oif = sk->sk_bound_dev_if; 725 726 if (msg->msg_controllen) { 727 opt = &opt_space; 728 memset(opt, 0, sizeof(struct ipv6_txoptions)); 729 opt->tot_len = sizeof(*opt); 730 731 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass); 732 if (err < 0) { 733 fl6_sock_release(flowlabel); 734 return err; 735 } 736 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 737 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 738 if (flowlabel == NULL) 739 return -EINVAL; 740 } 741 if (!(opt->opt_nflen|opt->opt_flen)) 742 opt = NULL; 743 connected = 0; 744 } 745 if (opt == NULL) 746 opt = np->opt; 747 if (flowlabel) 748 opt = fl6_merge_options(&opt_space, flowlabel, opt); 749 opt = ipv6_fixup_options(&opt_space, opt); 750 751 fl.proto = sk->sk_protocol; 752 ipv6_addr_copy(&fl.fl6_dst, daddr); 753 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 754 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 755 fl.fl_ip_sport = inet->sport; 756 757 /* merge ip6_build_xmit from ip6_output */ 758 if (opt && opt->srcrt) { 759 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 760 ipv6_addr_copy(&final, &fl.fl6_dst); 761 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 762 final_p = &final; 763 connected = 0; 764 } 765 766 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 767 fl.oif = np->mcast_oif; 768 connected = 0; 769 } 770 771 security_sk_classify_flow(sk, &fl); 772 773 err = ip6_sk_dst_lookup(sk, &dst, &fl); 774 if (err) 775 goto out; 776 if (final_p) 777 ipv6_addr_copy(&fl.fl6_dst, final_p); 778 779 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { 780 if (err == -EREMOTE) 781 err = ip6_dst_blackhole(sk, &dst, &fl); 782 if (err < 0) 783 goto out; 784 } 785 786 if (hlimit < 0) { 787 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 788 hlimit = np->mcast_hops; 789 else 790 hlimit = np->hop_limit; 791 if (hlimit < 0) 792 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 793 if (hlimit < 0) 794 hlimit = ipv6_get_hoplimit(dst->dev); 795 } 796 797 if (tclass < 0) { 798 tclass = np->tclass; 799 if (tclass < 0) 800 tclass = 0; 801 } 802 803 if (msg->msg_flags&MSG_CONFIRM) 804 goto do_confirm; 805 back_from_confirm: 806 807 lock_sock(sk); 808 if (unlikely(up->pending)) { 809 /* The socket is already corked while preparing it. */ 810 /* ... which is an evident application bug. --ANK */ 811 release_sock(sk); 812 813 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 814 err = -EINVAL; 815 goto out; 816 } 817 818 up->pending = AF_INET6; 819 820 do_append_data: 821 up->len += ulen; 822 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 823 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 824 sizeof(struct udphdr), hlimit, tclass, opt, &fl, 825 (struct rt6_info*)dst, 826 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 827 if (err) 828 udp_v6_flush_pending_frames(sk); 829 else if (!corkreq) 830 err = udp_v6_push_pending_frames(sk); 831 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 832 up->pending = 0; 833 834 if (dst) { 835 if (connected) { 836 ip6_dst_store(sk, dst, 837 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 838 &np->daddr : NULL, 839 #ifdef CONFIG_IPV6_SUBTREES 840 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 841 &np->saddr : 842 #endif 843 NULL); 844 } else { 845 dst_release(dst); 846 } 847 } 848 849 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 return len; 856 /* 857 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 858 * ENOBUFS might not be good (it's not tunable per se), but otherwise 859 * we don't have a good statistic (IpOutDiscards but it can be too many 860 * things). We could add another new stat but at least for now that 861 * seems like overkill. 862 */ 863 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 864 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); 865 } 866 return err; 867 868 do_confirm: 869 dst_confirm(dst); 870 if (!(msg->msg_flags&MSG_PROBE) || len) 871 goto back_from_confirm; 872 err = 0; 873 goto out; 874 } 875 876 int udpv6_destroy_sock(struct sock *sk) 877 { 878 lock_sock(sk); 879 udp_v6_flush_pending_frames(sk); 880 release_sock(sk); 881 882 inet6_destroy_sock(sk); 883 884 return 0; 885 } 886 887 /* 888 * Socket option code for UDP 889 */ 890 int udpv6_setsockopt(struct sock *sk, int level, int optname, 891 char __user *optval, int optlen) 892 { 893 if (level == SOL_UDP || level == SOL_UDPLITE) 894 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 895 udp_v6_push_pending_frames); 896 return ipv6_setsockopt(sk, level, optname, optval, optlen); 897 } 898 899 #ifdef CONFIG_COMPAT 900 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 901 char __user *optval, int optlen) 902 { 903 if (level == SOL_UDP || level == SOL_UDPLITE) 904 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 905 udp_v6_push_pending_frames); 906 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 907 } 908 #endif 909 910 int udpv6_getsockopt(struct sock *sk, int level, int optname, 911 char __user *optval, int __user *optlen) 912 { 913 if (level == SOL_UDP || level == SOL_UDPLITE) 914 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 915 return ipv6_getsockopt(sk, level, optname, optval, optlen); 916 } 917 918 #ifdef CONFIG_COMPAT 919 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 920 char __user *optval, int __user *optlen) 921 { 922 if (level == SOL_UDP || level == SOL_UDPLITE) 923 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 924 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 925 } 926 #endif 927 928 static struct inet6_protocol udpv6_protocol = { 929 .handler = udpv6_rcv, 930 .err_handler = udpv6_err, 931 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 932 }; 933 934 /* ------------------------------------------------------------------------ */ 935 #ifdef CONFIG_PROC_FS 936 937 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 938 { 939 struct inet_sock *inet = inet_sk(sp); 940 struct ipv6_pinfo *np = inet6_sk(sp); 941 struct in6_addr *dest, *src; 942 __u16 destp, srcp; 943 944 dest = &np->daddr; 945 src = &np->rcv_saddr; 946 destp = ntohs(inet->dport); 947 srcp = ntohs(inet->sport); 948 seq_printf(seq, 949 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 950 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 951 bucket, 952 src->s6_addr32[0], src->s6_addr32[1], 953 src->s6_addr32[2], src->s6_addr32[3], srcp, 954 dest->s6_addr32[0], dest->s6_addr32[1], 955 dest->s6_addr32[2], dest->s6_addr32[3], destp, 956 sp->sk_state, 957 atomic_read(&sp->sk_wmem_alloc), 958 atomic_read(&sp->sk_rmem_alloc), 959 0, 0L, 0, 960 sock_i_uid(sp), 0, 961 sock_i_ino(sp), 962 atomic_read(&sp->sk_refcnt), sp); 963 } 964 965 int udp6_seq_show(struct seq_file *seq, void *v) 966 { 967 if (v == SEQ_START_TOKEN) 968 seq_printf(seq, 969 " sl " 970 "local_address " 971 "remote_address " 972 "st tx_queue rx_queue tr tm->when retrnsmt" 973 " uid timeout inode\n"); 974 else 975 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 976 return 0; 977 } 978 979 static struct file_operations udp6_seq_fops; 980 static struct udp_seq_afinfo udp6_seq_afinfo = { 981 .owner = THIS_MODULE, 982 .name = "udp6", 983 .family = AF_INET6, 984 .hashtable = udp_hash, 985 .seq_show = udp6_seq_show, 986 .seq_fops = &udp6_seq_fops, 987 }; 988 989 int __init udp6_proc_init(void) 990 { 991 return udp_proc_register(&udp6_seq_afinfo); 992 } 993 994 void udp6_proc_exit(void) { 995 udp_proc_unregister(&udp6_seq_afinfo); 996 } 997 #endif /* CONFIG_PROC_FS */ 998 999 /* ------------------------------------------------------------------------ */ 1000 1001 DEFINE_PROTO_INUSE(udpv6) 1002 1003 struct proto udpv6_prot = { 1004 .name = "UDPv6", 1005 .owner = THIS_MODULE, 1006 .close = udp_lib_close, 1007 .connect = ip6_datagram_connect, 1008 .disconnect = udp_disconnect, 1009 .ioctl = udp_ioctl, 1010 .destroy = udpv6_destroy_sock, 1011 .setsockopt = udpv6_setsockopt, 1012 .getsockopt = udpv6_getsockopt, 1013 .sendmsg = udpv6_sendmsg, 1014 .recvmsg = udpv6_recvmsg, 1015 .backlog_rcv = udpv6_queue_rcv_skb, 1016 .hash = udp_lib_hash, 1017 .unhash = udp_lib_unhash, 1018 .get_port = udp_v6_get_port, 1019 .memory_allocated = &udp_memory_allocated, 1020 .sysctl_mem = sysctl_udp_mem, 1021 .sysctl_wmem = &sysctl_udp_wmem_min, 1022 .sysctl_rmem = &sysctl_udp_rmem_min, 1023 .obj_size = sizeof(struct udp6_sock), 1024 #ifdef CONFIG_COMPAT 1025 .compat_setsockopt = compat_udpv6_setsockopt, 1026 .compat_getsockopt = compat_udpv6_getsockopt, 1027 #endif 1028 REF_PROTO_INUSE(udpv6) 1029 }; 1030 1031 static struct inet_protosw udpv6_protosw = { 1032 .type = SOCK_DGRAM, 1033 .protocol = IPPROTO_UDP, 1034 .prot = &udpv6_prot, 1035 .ops = &inet6_dgram_ops, 1036 .capability =-1, 1037 .no_check = UDP_CSUM_DEFAULT, 1038 .flags = INET_PROTOSW_PERMANENT, 1039 }; 1040 1041 1042 int __init udpv6_init(void) 1043 { 1044 int ret; 1045 1046 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1047 if (ret) 1048 goto out; 1049 1050 ret = inet6_register_protosw(&udpv6_protosw); 1051 if (ret) 1052 goto out_udpv6_protocol; 1053 out: 1054 return ret; 1055 1056 out_udpv6_protocol: 1057 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1058 goto out; 1059 } 1060 1061 void udpv6_exit(void) 1062 { 1063 inet6_unregister_protosw(&udpv6_protosw); 1064 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1065 } 1066