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 size_t copied; 124 int err, copy_only, is_udplite = IS_UDPLITE(sk); 125 126 if (addr_len) 127 *addr_len=sizeof(struct sockaddr_in6); 128 129 if (flags & MSG_ERRQUEUE) 130 return ipv6_recv_error(sk, msg, len); 131 132 try_again: 133 skb = skb_recv_datagram(sk, flags, noblock, &err); 134 if (!skb) 135 goto out; 136 137 copied = skb->len - sizeof(struct udphdr); 138 if (copied > len) { 139 copied = len; 140 msg->msg_flags |= MSG_TRUNC; 141 } 142 143 /* 144 * Decide whether to checksum and/or copy data. 145 */ 146 copy_only = (skb->ip_summed==CHECKSUM_UNNECESSARY); 147 148 if (is_udplite || (!copy_only && msg->msg_flags&MSG_TRUNC)) { 149 if (__udp_lib_checksum_complete(skb)) 150 goto csum_copy_err; 151 copy_only = 1; 152 } 153 154 if (copy_only) 155 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 156 msg->msg_iov, copied ); 157 else { 158 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 159 if (err == -EINVAL) 160 goto csum_copy_err; 161 } 162 if (err) 163 goto out_free; 164 165 sock_recv_timestamp(msg, sk, skb); 166 167 /* Copy the address. */ 168 if (msg->msg_name) { 169 struct sockaddr_in6 *sin6; 170 171 sin6 = (struct sockaddr_in6 *) msg->msg_name; 172 sin6->sin6_family = AF_INET6; 173 sin6->sin6_port = skb->h.uh->source; 174 sin6->sin6_flowinfo = 0; 175 sin6->sin6_scope_id = 0; 176 177 if (skb->protocol == htons(ETH_P_IP)) 178 ipv6_addr_set(&sin6->sin6_addr, 0, 0, 179 htonl(0xffff), skb->nh.iph->saddr); 180 else { 181 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 182 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 183 sin6->sin6_scope_id = IP6CB(skb)->iif; 184 } 185 186 } 187 if (skb->protocol == htons(ETH_P_IP)) { 188 if (inet->cmsg_flags) 189 ip_cmsg_recv(msg, skb); 190 } else { 191 if (np->rxopt.all) 192 datagram_recv_ctl(sk, msg, skb); 193 } 194 195 err = copied; 196 if (flags & MSG_TRUNC) 197 err = skb->len - sizeof(struct udphdr); 198 199 out_free: 200 skb_free_datagram(sk, skb); 201 out: 202 return err; 203 204 csum_copy_err: 205 skb_kill_datagram(sk, skb, flags); 206 207 if (flags & MSG_DONTWAIT) { 208 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite); 209 return -EAGAIN; 210 } 211 goto try_again; 212 } 213 214 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 215 int type, int code, int offset, __be32 info, 216 struct hlist_head udptable[] ) 217 { 218 struct ipv6_pinfo *np; 219 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 220 struct in6_addr *saddr = &hdr->saddr; 221 struct in6_addr *daddr = &hdr->daddr; 222 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 223 struct sock *sk; 224 int err; 225 226 sk = __udp6_lib_lookup(daddr, uh->dest, 227 saddr, uh->source, inet6_iif(skb), udptable); 228 if (sk == NULL) 229 return; 230 231 np = inet6_sk(sk); 232 233 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 234 goto out; 235 236 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 237 goto out; 238 239 if (np->recverr) 240 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 241 242 sk->sk_err = err; 243 sk->sk_error_report(sk); 244 out: 245 sock_put(sk); 246 } 247 248 static __inline__ void udpv6_err(struct sk_buff *skb, 249 struct inet6_skb_parm *opt, int type, 250 int code, int offset, __be32 info ) 251 { 252 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash); 253 } 254 255 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 256 { 257 struct udp_sock *up = udp_sk(sk); 258 int rc; 259 260 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 261 goto drop; 262 263 /* 264 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 265 */ 266 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 267 268 if (up->pcrlen == 0) { /* full coverage was set */ 269 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 270 " %d while full coverage %d requested\n", 271 UDP_SKB_CB(skb)->cscov, skb->len); 272 goto drop; 273 } 274 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 275 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 276 "too small, need min %d\n", 277 UDP_SKB_CB(skb)->cscov, up->pcrlen); 278 goto drop; 279 } 280 } 281 282 if (udp_lib_checksum_complete(skb)) 283 goto drop; 284 285 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { 286 /* Note that an ENOMEM error is charged twice */ 287 if (rc == -ENOMEM) 288 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag); 289 goto drop; 290 } 291 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); 292 return 0; 293 drop: 294 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag); 295 kfree_skb(skb); 296 return -1; 297 } 298 299 static struct sock *udp_v6_mcast_next(struct sock *sk, 300 __be16 loc_port, struct in6_addr *loc_addr, 301 __be16 rmt_port, struct in6_addr *rmt_addr, 302 int dif) 303 { 304 struct hlist_node *node; 305 struct sock *s = sk; 306 unsigned short num = ntohs(loc_port); 307 308 sk_for_each_from(s, node) { 309 struct inet_sock *inet = inet_sk(s); 310 311 if (s->sk_hash == num && s->sk_family == PF_INET6) { 312 struct ipv6_pinfo *np = inet6_sk(s); 313 if (inet->dport) { 314 if (inet->dport != rmt_port) 315 continue; 316 } 317 if (!ipv6_addr_any(&np->daddr) && 318 !ipv6_addr_equal(&np->daddr, rmt_addr)) 319 continue; 320 321 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 322 continue; 323 324 if (!ipv6_addr_any(&np->rcv_saddr)) { 325 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 326 continue; 327 } 328 if(!inet6_mc_check(s, loc_addr, rmt_addr)) 329 continue; 330 return s; 331 } 332 } 333 return NULL; 334 } 335 336 /* 337 * Note: called only from the BH handler context, 338 * so we don't need to lock the hashes. 339 */ 340 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr, 341 struct in6_addr *daddr, struct hlist_head udptable[]) 342 { 343 struct sock *sk, *sk2; 344 const struct udphdr *uh = skb->h.uh; 345 int dif; 346 347 read_lock(&udp_hash_lock); 348 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); 349 dif = inet6_iif(skb); 350 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); 351 if (!sk) { 352 kfree_skb(skb); 353 goto out; 354 } 355 356 sk2 = sk; 357 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, 358 uh->source, saddr, dif))) { 359 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); 360 if (buff) 361 udpv6_queue_rcv_skb(sk2, buff); 362 } 363 udpv6_queue_rcv_skb(sk, skb); 364 out: 365 read_unlock(&udp_hash_lock); 366 return 0; 367 } 368 369 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh) 370 371 { 372 if (uh->check == 0) { 373 /* RFC 2460 section 8.1 says that we SHOULD log 374 this error. Well, it is reasonable. 375 */ 376 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 377 return 1; 378 } 379 if (skb->ip_summed == CHECKSUM_COMPLETE && 380 !csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr, 381 skb->len, IPPROTO_UDP, skb->csum )) 382 skb->ip_summed = CHECKSUM_UNNECESSARY; 383 384 if (skb->ip_summed != CHECKSUM_UNNECESSARY) 385 skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr, 386 &skb->nh.ipv6h->daddr, 387 skb->len, IPPROTO_UDP, 388 0)); 389 390 return (UDP_SKB_CB(skb)->partial_cov = 0); 391 } 392 393 int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[], 394 int is_udplite) 395 { 396 struct sk_buff *skb = *pskb; 397 struct sock *sk; 398 struct udphdr *uh; 399 struct net_device *dev = skb->dev; 400 struct in6_addr *saddr, *daddr; 401 u32 ulen = 0; 402 403 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 404 goto short_packet; 405 406 saddr = &skb->nh.ipv6h->saddr; 407 daddr = &skb->nh.ipv6h->daddr; 408 uh = skb->h.uh; 409 410 ulen = ntohs(uh->len); 411 if (ulen > skb->len) 412 goto short_packet; 413 414 if(! is_udplite ) { /* UDP validates ulen. */ 415 416 /* Check for jumbo payload */ 417 if (ulen == 0) 418 ulen = skb->len; 419 420 if (ulen < sizeof(*uh)) 421 goto short_packet; 422 423 if (ulen < skb->len) { 424 if (pskb_trim_rcsum(skb, ulen)) 425 goto short_packet; 426 saddr = &skb->nh.ipv6h->saddr; 427 daddr = &skb->nh.ipv6h->daddr; 428 uh = skb->h.uh; 429 } 430 431 if (udp6_csum_init(skb, uh)) 432 goto discard; 433 434 } else { /* UDP-Lite validates cscov. */ 435 if (udplite6_csum_init(skb, uh)) 436 goto discard; 437 } 438 439 /* 440 * Multicast receive code 441 */ 442 if (ipv6_addr_is_multicast(daddr)) 443 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable); 444 445 /* Unicast */ 446 447 /* 448 * check socket cache ... must talk to Alan about his plans 449 * for sock caches... i'll skip this for now. 450 */ 451 sk = __udp6_lib_lookup(saddr, uh->source, 452 daddr, uh->dest, inet6_iif(skb), udptable); 453 454 if (sk == NULL) { 455 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 456 goto discard; 457 458 if (udp_lib_checksum_complete(skb)) 459 goto discard; 460 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, is_udplite); 461 462 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 463 464 kfree_skb(skb); 465 return(0); 466 } 467 468 /* deliver */ 469 470 udpv6_queue_rcv_skb(sk, skb); 471 sock_put(sk); 472 return(0); 473 474 short_packet: 475 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 476 is_udplite? "-Lite" : "", ulen, skb->len); 477 478 discard: 479 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite); 480 kfree_skb(skb); 481 return(0); 482 } 483 484 static __inline__ int udpv6_rcv(struct sk_buff **pskb) 485 { 486 return __udp6_lib_rcv(pskb, udp_hash, 0); 487 } 488 489 /* 490 * Throw away all pending data and cancel the corking. Socket is locked. 491 */ 492 static void udp_v6_flush_pending_frames(struct sock *sk) 493 { 494 struct udp_sock *up = udp_sk(sk); 495 496 if (up->pending) { 497 up->len = 0; 498 up->pending = 0; 499 ip6_flush_pending_frames(sk); 500 } 501 } 502 503 /* 504 * Sending 505 */ 506 507 static int udp_v6_push_pending_frames(struct sock *sk) 508 { 509 struct sk_buff *skb; 510 struct udphdr *uh; 511 struct udp_sock *up = udp_sk(sk); 512 struct inet_sock *inet = inet_sk(sk); 513 struct flowi *fl = &inet->cork.fl; 514 int err = 0; 515 __wsum csum = 0; 516 517 /* Grab the skbuff where UDP header space exists. */ 518 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 519 goto out; 520 521 /* 522 * Create a UDP header 523 */ 524 uh = skb->h.uh; 525 uh->source = fl->fl_ip_sport; 526 uh->dest = fl->fl_ip_dport; 527 uh->len = htons(up->len); 528 uh->check = 0; 529 530 if (up->pcflag) 531 csum = udplite_csum_outgoing(sk, skb); 532 else 533 csum = udp_csum_outgoing(sk, skb); 534 535 /* add protocol-dependent pseudo-header */ 536 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 537 up->len, fl->proto, csum ); 538 if (uh->check == 0) 539 uh->check = CSUM_MANGLED_0; 540 541 err = ip6_push_pending_frames(sk); 542 out: 543 up->len = 0; 544 up->pending = 0; 545 return err; 546 } 547 548 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 549 struct msghdr *msg, size_t len) 550 { 551 struct ipv6_txoptions opt_space; 552 struct udp_sock *up = udp_sk(sk); 553 struct inet_sock *inet = inet_sk(sk); 554 struct ipv6_pinfo *np = inet6_sk(sk); 555 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 556 struct in6_addr *daddr, *final_p = NULL, final; 557 struct ipv6_txoptions *opt = NULL; 558 struct ip6_flowlabel *flowlabel = NULL; 559 struct flowi fl; 560 struct dst_entry *dst; 561 int addr_len = msg->msg_namelen; 562 int ulen = len; 563 int hlimit = -1; 564 int tclass = -1; 565 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 566 int err; 567 int connected = 0; 568 int is_udplite = up->pcflag; 569 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 570 571 /* destination address check */ 572 if (sin6) { 573 if (addr_len < offsetof(struct sockaddr, sa_data)) 574 return -EINVAL; 575 576 switch (sin6->sin6_family) { 577 case AF_INET6: 578 if (addr_len < SIN6_LEN_RFC2133) 579 return -EINVAL; 580 daddr = &sin6->sin6_addr; 581 break; 582 case AF_INET: 583 goto do_udp_sendmsg; 584 case AF_UNSPEC: 585 msg->msg_name = sin6 = NULL; 586 msg->msg_namelen = addr_len = 0; 587 daddr = NULL; 588 break; 589 default: 590 return -EINVAL; 591 } 592 } else if (!up->pending) { 593 if (sk->sk_state != TCP_ESTABLISHED) 594 return -EDESTADDRREQ; 595 daddr = &np->daddr; 596 } else 597 daddr = NULL; 598 599 if (daddr) { 600 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) { 601 struct sockaddr_in sin; 602 sin.sin_family = AF_INET; 603 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; 604 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 605 msg->msg_name = &sin; 606 msg->msg_namelen = sizeof(sin); 607 do_udp_sendmsg: 608 if (__ipv6_only_sock(sk)) 609 return -ENETUNREACH; 610 return udp_sendmsg(iocb, sk, msg, len); 611 } 612 } 613 614 if (up->pending == AF_INET) 615 return udp_sendmsg(iocb, sk, msg, len); 616 617 /* Rough check on arithmetic overflow, 618 better check is made in ip6_build_xmit 619 */ 620 if (len > INT_MAX - sizeof(struct udphdr)) 621 return -EMSGSIZE; 622 623 if (up->pending) { 624 /* 625 * There are pending frames. 626 * The socket lock must be held while it's corked. 627 */ 628 lock_sock(sk); 629 if (likely(up->pending)) { 630 if (unlikely(up->pending != AF_INET6)) { 631 release_sock(sk); 632 return -EAFNOSUPPORT; 633 } 634 dst = NULL; 635 goto do_append_data; 636 } 637 release_sock(sk); 638 } 639 ulen += sizeof(struct udphdr); 640 641 memset(&fl, 0, sizeof(fl)); 642 643 if (sin6) { 644 if (sin6->sin6_port == 0) 645 return -EINVAL; 646 647 fl.fl_ip_dport = sin6->sin6_port; 648 daddr = &sin6->sin6_addr; 649 650 if (np->sndflow) { 651 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 652 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 653 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 654 if (flowlabel == NULL) 655 return -EINVAL; 656 daddr = &flowlabel->dst; 657 } 658 } 659 660 /* 661 * Otherwise it will be difficult to maintain 662 * sk->sk_dst_cache. 663 */ 664 if (sk->sk_state == TCP_ESTABLISHED && 665 ipv6_addr_equal(daddr, &np->daddr)) 666 daddr = &np->daddr; 667 668 if (addr_len >= sizeof(struct sockaddr_in6) && 669 sin6->sin6_scope_id && 670 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 671 fl.oif = sin6->sin6_scope_id; 672 } else { 673 if (sk->sk_state != TCP_ESTABLISHED) 674 return -EDESTADDRREQ; 675 676 fl.fl_ip_dport = inet->dport; 677 daddr = &np->daddr; 678 fl.fl6_flowlabel = np->flow_label; 679 connected = 1; 680 } 681 682 if (!fl.oif) 683 fl.oif = sk->sk_bound_dev_if; 684 685 if (msg->msg_controllen) { 686 opt = &opt_space; 687 memset(opt, 0, sizeof(struct ipv6_txoptions)); 688 opt->tot_len = sizeof(*opt); 689 690 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass); 691 if (err < 0) { 692 fl6_sock_release(flowlabel); 693 return err; 694 } 695 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 696 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 697 if (flowlabel == NULL) 698 return -EINVAL; 699 } 700 if (!(opt->opt_nflen|opt->opt_flen)) 701 opt = NULL; 702 connected = 0; 703 } 704 if (opt == NULL) 705 opt = np->opt; 706 if (flowlabel) 707 opt = fl6_merge_options(&opt_space, flowlabel, opt); 708 opt = ipv6_fixup_options(&opt_space, opt); 709 710 fl.proto = sk->sk_protocol; 711 ipv6_addr_copy(&fl.fl6_dst, daddr); 712 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 713 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 714 fl.fl_ip_sport = inet->sport; 715 716 /* merge ip6_build_xmit from ip6_output */ 717 if (opt && opt->srcrt) { 718 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 719 ipv6_addr_copy(&final, &fl.fl6_dst); 720 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 721 final_p = &final; 722 connected = 0; 723 } 724 725 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 726 fl.oif = np->mcast_oif; 727 connected = 0; 728 } 729 730 security_sk_classify_flow(sk, &fl); 731 732 err = ip6_sk_dst_lookup(sk, &dst, &fl); 733 if (err) 734 goto out; 735 if (final_p) 736 ipv6_addr_copy(&fl.fl6_dst, final_p); 737 738 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0) 739 goto out; 740 741 if (hlimit < 0) { 742 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 743 hlimit = np->mcast_hops; 744 else 745 hlimit = np->hop_limit; 746 if (hlimit < 0) 747 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 748 if (hlimit < 0) 749 hlimit = ipv6_get_hoplimit(dst->dev); 750 } 751 752 if (tclass < 0) { 753 tclass = np->tclass; 754 if (tclass < 0) 755 tclass = 0; 756 } 757 758 if (msg->msg_flags&MSG_CONFIRM) 759 goto do_confirm; 760 back_from_confirm: 761 762 lock_sock(sk); 763 if (unlikely(up->pending)) { 764 /* The socket is already corked while preparing it. */ 765 /* ... which is an evident application bug. --ANK */ 766 release_sock(sk); 767 768 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 769 err = -EINVAL; 770 goto out; 771 } 772 773 up->pending = AF_INET6; 774 775 do_append_data: 776 up->len += ulen; 777 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 778 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 779 sizeof(struct udphdr), hlimit, tclass, opt, &fl, 780 (struct rt6_info*)dst, 781 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 782 if (err) 783 udp_v6_flush_pending_frames(sk); 784 else if (!corkreq) 785 err = udp_v6_push_pending_frames(sk); 786 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 787 up->pending = 0; 788 789 if (dst) { 790 if (connected) { 791 ip6_dst_store(sk, dst, 792 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 793 &np->daddr : NULL, 794 #ifdef CONFIG_IPV6_SUBTREES 795 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 796 &np->saddr : 797 #endif 798 NULL); 799 } else { 800 dst_release(dst); 801 } 802 } 803 804 if (err > 0) 805 err = np->recverr ? net_xmit_errno(err) : 0; 806 release_sock(sk); 807 out: 808 fl6_sock_release(flowlabel); 809 if (!err) { 810 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); 811 return len; 812 } 813 /* 814 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 815 * ENOBUFS might not be good (it's not tunable per se), but otherwise 816 * we don't have a good statistic (IpOutDiscards but it can be too many 817 * things). We could add another new stat but at least for now that 818 * seems like overkill. 819 */ 820 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 821 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); 822 } 823 return err; 824 825 do_confirm: 826 dst_confirm(dst); 827 if (!(msg->msg_flags&MSG_PROBE) || len) 828 goto back_from_confirm; 829 err = 0; 830 goto out; 831 } 832 833 int udpv6_destroy_sock(struct sock *sk) 834 { 835 lock_sock(sk); 836 udp_v6_flush_pending_frames(sk); 837 release_sock(sk); 838 839 inet6_destroy_sock(sk); 840 841 return 0; 842 } 843 844 /* 845 * Socket option code for UDP 846 */ 847 int udpv6_setsockopt(struct sock *sk, int level, int optname, 848 char __user *optval, int optlen) 849 { 850 if (level == SOL_UDP || level == SOL_UDPLITE) 851 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 852 udp_v6_push_pending_frames); 853 return ipv6_setsockopt(sk, level, optname, optval, optlen); 854 } 855 856 #ifdef CONFIG_COMPAT 857 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 858 char __user *optval, int optlen) 859 { 860 if (level == SOL_UDP || level == SOL_UDPLITE) 861 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 862 udp_v6_push_pending_frames); 863 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 864 } 865 #endif 866 867 int udpv6_getsockopt(struct sock *sk, int level, int optname, 868 char __user *optval, int __user *optlen) 869 { 870 if (level == SOL_UDP || level == SOL_UDPLITE) 871 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 872 return ipv6_getsockopt(sk, level, optname, optval, optlen); 873 } 874 875 #ifdef CONFIG_COMPAT 876 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 877 char __user *optval, int __user *optlen) 878 { 879 if (level == SOL_UDP || level == SOL_UDPLITE) 880 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 881 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 882 } 883 #endif 884 885 static struct inet6_protocol udpv6_protocol = { 886 .handler = udpv6_rcv, 887 .err_handler = udpv6_err, 888 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 889 }; 890 891 /* ------------------------------------------------------------------------ */ 892 #ifdef CONFIG_PROC_FS 893 894 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 895 { 896 struct inet_sock *inet = inet_sk(sp); 897 struct ipv6_pinfo *np = inet6_sk(sp); 898 struct in6_addr *dest, *src; 899 __u16 destp, srcp; 900 901 dest = &np->daddr; 902 src = &np->rcv_saddr; 903 destp = ntohs(inet->dport); 904 srcp = ntohs(inet->sport); 905 seq_printf(seq, 906 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 907 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", 908 bucket, 909 src->s6_addr32[0], src->s6_addr32[1], 910 src->s6_addr32[2], src->s6_addr32[3], srcp, 911 dest->s6_addr32[0], dest->s6_addr32[1], 912 dest->s6_addr32[2], dest->s6_addr32[3], destp, 913 sp->sk_state, 914 atomic_read(&sp->sk_wmem_alloc), 915 atomic_read(&sp->sk_rmem_alloc), 916 0, 0L, 0, 917 sock_i_uid(sp), 0, 918 sock_i_ino(sp), 919 atomic_read(&sp->sk_refcnt), sp); 920 } 921 922 int udp6_seq_show(struct seq_file *seq, void *v) 923 { 924 if (v == SEQ_START_TOKEN) 925 seq_printf(seq, 926 " sl " 927 "local_address " 928 "remote_address " 929 "st tx_queue rx_queue tr tm->when retrnsmt" 930 " uid timeout inode\n"); 931 else 932 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 933 return 0; 934 } 935 936 static struct file_operations udp6_seq_fops; 937 static struct udp_seq_afinfo udp6_seq_afinfo = { 938 .owner = THIS_MODULE, 939 .name = "udp6", 940 .family = AF_INET6, 941 .hashtable = udp_hash, 942 .seq_show = udp6_seq_show, 943 .seq_fops = &udp6_seq_fops, 944 }; 945 946 int __init udp6_proc_init(void) 947 { 948 return udp_proc_register(&udp6_seq_afinfo); 949 } 950 951 void udp6_proc_exit(void) { 952 udp_proc_unregister(&udp6_seq_afinfo); 953 } 954 #endif /* CONFIG_PROC_FS */ 955 956 /* ------------------------------------------------------------------------ */ 957 958 struct proto udpv6_prot = { 959 .name = "UDPv6", 960 .owner = THIS_MODULE, 961 .close = udp_lib_close, 962 .connect = ip6_datagram_connect, 963 .disconnect = udp_disconnect, 964 .ioctl = udp_ioctl, 965 .destroy = udpv6_destroy_sock, 966 .setsockopt = udpv6_setsockopt, 967 .getsockopt = udpv6_getsockopt, 968 .sendmsg = udpv6_sendmsg, 969 .recvmsg = udpv6_recvmsg, 970 .backlog_rcv = udpv6_queue_rcv_skb, 971 .hash = udp_lib_hash, 972 .unhash = udp_lib_unhash, 973 .get_port = udp_v6_get_port, 974 .obj_size = sizeof(struct udp6_sock), 975 #ifdef CONFIG_COMPAT 976 .compat_setsockopt = compat_udpv6_setsockopt, 977 .compat_getsockopt = compat_udpv6_getsockopt, 978 #endif 979 }; 980 981 static struct inet_protosw udpv6_protosw = { 982 .type = SOCK_DGRAM, 983 .protocol = IPPROTO_UDP, 984 .prot = &udpv6_prot, 985 .ops = &inet6_dgram_ops, 986 .capability =-1, 987 .no_check = UDP_CSUM_DEFAULT, 988 .flags = INET_PROTOSW_PERMANENT, 989 }; 990 991 992 void __init udpv6_init(void) 993 { 994 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0) 995 printk(KERN_ERR "udpv6_init: Could not register protocol\n"); 996 inet6_register_protosw(&udpv6_protosw); 997 } 998