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 * Fixes: 11 * Hideaki YOSHIFUJI : sin6_scope_id support 12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which 13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind 14 * a single port at the same time. 15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 */ 23 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/ipv6.h> 33 #include <linux/icmpv6.h> 34 #include <linux/init.h> 35 #include <linux/module.h> 36 #include <linux/skbuff.h> 37 #include <linux/slab.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 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 54 { 55 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 56 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 57 __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr; 58 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 59 int sk_ipv6only = ipv6_only_sock(sk); 60 int sk2_ipv6only = inet_v6_ipv6only(sk2); 61 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 62 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 63 64 /* if both are mapped, treat as IPv4 */ 65 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 66 return (!sk2_ipv6only && 67 (!sk1_rcv_saddr || !sk2_rcv_saddr || 68 sk1_rcv_saddr == sk2_rcv_saddr)); 69 70 if (addr_type2 == IPV6_ADDR_ANY && 71 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 72 return 1; 73 74 if (addr_type == IPV6_ADDR_ANY && 75 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 76 return 1; 77 78 if (sk2_rcv_saddr6 && 79 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 80 return 1; 81 82 return 0; 83 } 84 85 static unsigned int udp6_portaddr_hash(struct net *net, 86 const struct in6_addr *addr6, 87 unsigned int port) 88 { 89 unsigned int hash, mix = net_hash_mix(net); 90 91 if (ipv6_addr_any(addr6)) 92 hash = jhash_1word(0, mix); 93 else if (ipv6_addr_v4mapped(addr6)) 94 hash = jhash_1word(addr6->s6_addr32[3], mix); 95 else 96 hash = jhash2(addr6->s6_addr32, 4, mix); 97 98 return hash ^ port; 99 } 100 101 102 int udp_v6_get_port(struct sock *sk, unsigned short snum) 103 { 104 unsigned int hash2_nulladdr = 105 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 106 unsigned int hash2_partial = 107 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); 108 109 /* precompute partial secondary hash */ 110 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 111 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 112 } 113 114 static inline int compute_score(struct sock *sk, struct net *net, 115 unsigned short hnum, 116 struct in6_addr *saddr, __be16 sport, 117 struct in6_addr *daddr, __be16 dport, 118 int dif) 119 { 120 int score = -1; 121 122 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 123 sk->sk_family == PF_INET6) { 124 struct ipv6_pinfo *np = inet6_sk(sk); 125 struct inet_sock *inet = inet_sk(sk); 126 127 score = 0; 128 if (inet->inet_dport) { 129 if (inet->inet_dport != sport) 130 return -1; 131 score++; 132 } 133 if (!ipv6_addr_any(&np->rcv_saddr)) { 134 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 135 return -1; 136 score++; 137 } 138 if (!ipv6_addr_any(&np->daddr)) { 139 if (!ipv6_addr_equal(&np->daddr, saddr)) 140 return -1; 141 score++; 142 } 143 if (sk->sk_bound_dev_if) { 144 if (sk->sk_bound_dev_if != dif) 145 return -1; 146 score++; 147 } 148 } 149 return score; 150 } 151 152 #define SCORE2_MAX (1 + 1 + 1) 153 static inline int compute_score2(struct sock *sk, struct net *net, 154 const struct in6_addr *saddr, __be16 sport, 155 const struct in6_addr *daddr, unsigned short hnum, 156 int dif) 157 { 158 int score = -1; 159 160 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 161 sk->sk_family == PF_INET6) { 162 struct ipv6_pinfo *np = inet6_sk(sk); 163 struct inet_sock *inet = inet_sk(sk); 164 165 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 166 return -1; 167 score = 0; 168 if (inet->inet_dport) { 169 if (inet->inet_dport != sport) 170 return -1; 171 score++; 172 } 173 if (!ipv6_addr_any(&np->daddr)) { 174 if (!ipv6_addr_equal(&np->daddr, saddr)) 175 return -1; 176 score++; 177 } 178 if (sk->sk_bound_dev_if) { 179 if (sk->sk_bound_dev_if != dif) 180 return -1; 181 score++; 182 } 183 } 184 return score; 185 } 186 187 188 /* called with read_rcu_lock() */ 189 static struct sock *udp6_lib_lookup2(struct net *net, 190 const struct in6_addr *saddr, __be16 sport, 191 const struct in6_addr *daddr, unsigned int hnum, int dif, 192 struct udp_hslot *hslot2, unsigned int slot2) 193 { 194 struct sock *sk, *result; 195 struct hlist_nulls_node *node; 196 int score, badness; 197 198 begin: 199 result = NULL; 200 badness = -1; 201 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 202 score = compute_score2(sk, net, saddr, sport, 203 daddr, hnum, dif); 204 if (score > badness) { 205 result = sk; 206 badness = score; 207 if (score == SCORE2_MAX) 208 goto exact_match; 209 } 210 } 211 /* 212 * if the nulls value we got at the end of this lookup is 213 * not the expected one, we must restart lookup. 214 * We probably met an item that was moved to another chain. 215 */ 216 if (get_nulls_value(node) != slot2) 217 goto begin; 218 219 if (result) { 220 exact_match: 221 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) 222 result = NULL; 223 else if (unlikely(compute_score2(result, net, saddr, sport, 224 daddr, hnum, dif) < badness)) { 225 sock_put(result); 226 goto begin; 227 } 228 } 229 return result; 230 } 231 232 static struct sock *__udp6_lib_lookup(struct net *net, 233 struct in6_addr *saddr, __be16 sport, 234 struct in6_addr *daddr, __be16 dport, 235 int dif, struct udp_table *udptable) 236 { 237 struct sock *sk, *result; 238 struct hlist_nulls_node *node; 239 unsigned short hnum = ntohs(dport); 240 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 241 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 242 int score, badness; 243 244 rcu_read_lock(); 245 if (hslot->count > 10) { 246 hash2 = udp6_portaddr_hash(net, daddr, hnum); 247 slot2 = hash2 & udptable->mask; 248 hslot2 = &udptable->hash2[slot2]; 249 if (hslot->count < hslot2->count) 250 goto begin; 251 252 result = udp6_lib_lookup2(net, saddr, sport, 253 daddr, hnum, dif, 254 hslot2, slot2); 255 if (!result) { 256 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 257 slot2 = hash2 & udptable->mask; 258 hslot2 = &udptable->hash2[slot2]; 259 if (hslot->count < hslot2->count) 260 goto begin; 261 262 result = udp6_lib_lookup2(net, saddr, sport, 263 &in6addr_any, hnum, dif, 264 hslot2, slot2); 265 } 266 rcu_read_unlock(); 267 return result; 268 } 269 begin: 270 result = NULL; 271 badness = -1; 272 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 273 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 274 if (score > badness) { 275 result = sk; 276 badness = score; 277 } 278 } 279 /* 280 * if the nulls value we got at the end of this lookup is 281 * not the expected one, we must restart lookup. 282 * We probably met an item that was moved to another chain. 283 */ 284 if (get_nulls_value(node) != slot) 285 goto begin; 286 287 if (result) { 288 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) 289 result = NULL; 290 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 291 daddr, dport, dif) < badness)) { 292 sock_put(result); 293 goto begin; 294 } 295 } 296 rcu_read_unlock(); 297 return result; 298 } 299 300 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 301 __be16 sport, __be16 dport, 302 struct udp_table *udptable) 303 { 304 struct sock *sk; 305 struct ipv6hdr *iph = ipv6_hdr(skb); 306 307 if (unlikely(sk = skb_steal_sock(skb))) 308 return sk; 309 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 310 &iph->daddr, dport, inet6_iif(skb), 311 udptable); 312 } 313 314 /* 315 * This should be easy, if there is something there we 316 * return it, otherwise we block. 317 */ 318 319 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 320 struct msghdr *msg, size_t len, 321 int noblock, int flags, int *addr_len) 322 { 323 struct ipv6_pinfo *np = inet6_sk(sk); 324 struct inet_sock *inet = inet_sk(sk); 325 struct sk_buff *skb; 326 unsigned int ulen; 327 int peeked; 328 int err; 329 int is_udplite = IS_UDPLITE(sk); 330 int is_udp4; 331 332 if (addr_len) 333 *addr_len=sizeof(struct sockaddr_in6); 334 335 if (flags & MSG_ERRQUEUE) 336 return ipv6_recv_error(sk, msg, len); 337 338 try_again: 339 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 340 &peeked, &err); 341 if (!skb) 342 goto out; 343 344 ulen = skb->len - sizeof(struct udphdr); 345 if (len > ulen) 346 len = ulen; 347 else if (len < ulen) 348 msg->msg_flags |= MSG_TRUNC; 349 350 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 351 352 /* 353 * If checksum is needed at all, try to do it while copying the 354 * data. If the data is truncated, or if we only want a partial 355 * coverage checksum (UDP-Lite), do it before the copy. 356 */ 357 358 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) { 359 if (udp_lib_checksum_complete(skb)) 360 goto csum_copy_err; 361 } 362 363 if (skb_csum_unnecessary(skb)) 364 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 365 msg->msg_iov,len); 366 else { 367 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 368 if (err == -EINVAL) 369 goto csum_copy_err; 370 } 371 if (err) 372 goto out_free; 373 374 if (!peeked) { 375 if (is_udp4) 376 UDP_INC_STATS_USER(sock_net(sk), 377 UDP_MIB_INDATAGRAMS, is_udplite); 378 else 379 UDP6_INC_STATS_USER(sock_net(sk), 380 UDP_MIB_INDATAGRAMS, is_udplite); 381 } 382 383 sock_recv_ts_and_drops(msg, sk, skb); 384 385 /* Copy the address. */ 386 if (msg->msg_name) { 387 struct sockaddr_in6 *sin6; 388 389 sin6 = (struct sockaddr_in6 *) msg->msg_name; 390 sin6->sin6_family = AF_INET6; 391 sin6->sin6_port = udp_hdr(skb)->source; 392 sin6->sin6_flowinfo = 0; 393 sin6->sin6_scope_id = 0; 394 395 if (is_udp4) 396 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 397 &sin6->sin6_addr); 398 else { 399 ipv6_addr_copy(&sin6->sin6_addr, 400 &ipv6_hdr(skb)->saddr); 401 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 402 sin6->sin6_scope_id = IP6CB(skb)->iif; 403 } 404 405 } 406 if (is_udp4) { 407 if (inet->cmsg_flags) 408 ip_cmsg_recv(msg, skb); 409 } else { 410 if (np->rxopt.all) 411 datagram_recv_ctl(sk, msg, skb); 412 } 413 414 err = len; 415 if (flags & MSG_TRUNC) 416 err = ulen; 417 418 out_free: 419 skb_free_datagram_locked(sk, skb); 420 out: 421 return err; 422 423 csum_copy_err: 424 lock_sock(sk); 425 if (!skb_kill_datagram(sk, skb, flags)) { 426 if (is_udp4) 427 UDP_INC_STATS_USER(sock_net(sk), 428 UDP_MIB_INERRORS, is_udplite); 429 else 430 UDP6_INC_STATS_USER(sock_net(sk), 431 UDP_MIB_INERRORS, is_udplite); 432 } 433 release_sock(sk); 434 435 if (flags & MSG_DONTWAIT) 436 return -EAGAIN; 437 goto try_again; 438 } 439 440 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 441 u8 type, u8 code, int offset, __be32 info, 442 struct udp_table *udptable) 443 { 444 struct ipv6_pinfo *np; 445 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 446 struct in6_addr *saddr = &hdr->saddr; 447 struct in6_addr *daddr = &hdr->daddr; 448 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 449 struct sock *sk; 450 int err; 451 452 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 453 saddr, uh->source, inet6_iif(skb), udptable); 454 if (sk == NULL) 455 return; 456 457 np = inet6_sk(sk); 458 459 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 460 goto out; 461 462 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 463 goto out; 464 465 if (np->recverr) 466 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 467 468 sk->sk_err = err; 469 sk->sk_error_report(sk); 470 out: 471 sock_put(sk); 472 } 473 474 static __inline__ void udpv6_err(struct sk_buff *skb, 475 struct inet6_skb_parm *opt, u8 type, 476 u8 code, int offset, __be32 info ) 477 { 478 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 479 } 480 481 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 482 { 483 struct udp_sock *up = udp_sk(sk); 484 int rc; 485 int is_udplite = IS_UDPLITE(sk); 486 487 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 488 goto drop; 489 490 /* 491 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 492 */ 493 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 494 495 if (up->pcrlen == 0) { /* full coverage was set */ 496 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 497 " %d while full coverage %d requested\n", 498 UDP_SKB_CB(skb)->cscov, skb->len); 499 goto drop; 500 } 501 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 502 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 503 "too small, need min %d\n", 504 UDP_SKB_CB(skb)->cscov, up->pcrlen); 505 goto drop; 506 } 507 } 508 509 if (sk->sk_filter) { 510 if (udp_lib_checksum_complete(skb)) 511 goto drop; 512 } 513 514 if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) { 515 /* Note that an ENOMEM error is charged twice */ 516 if (rc == -ENOMEM) 517 UDP6_INC_STATS_BH(sock_net(sk), 518 UDP_MIB_RCVBUFERRORS, is_udplite); 519 goto drop_no_sk_drops_inc; 520 } 521 522 return 0; 523 drop: 524 atomic_inc(&sk->sk_drops); 525 drop_no_sk_drops_inc: 526 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 527 kfree_skb(skb); 528 return -1; 529 } 530 531 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 532 __be16 loc_port, struct in6_addr *loc_addr, 533 __be16 rmt_port, struct in6_addr *rmt_addr, 534 int dif) 535 { 536 struct hlist_nulls_node *node; 537 struct sock *s = sk; 538 unsigned short num = ntohs(loc_port); 539 540 sk_nulls_for_each_from(s, node) { 541 struct inet_sock *inet = inet_sk(s); 542 543 if (!net_eq(sock_net(s), net)) 544 continue; 545 546 if (udp_sk(s)->udp_port_hash == num && 547 s->sk_family == PF_INET6) { 548 struct ipv6_pinfo *np = inet6_sk(s); 549 if (inet->inet_dport) { 550 if (inet->inet_dport != rmt_port) 551 continue; 552 } 553 if (!ipv6_addr_any(&np->daddr) && 554 !ipv6_addr_equal(&np->daddr, rmt_addr)) 555 continue; 556 557 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 558 continue; 559 560 if (!ipv6_addr_any(&np->rcv_saddr)) { 561 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 562 continue; 563 } 564 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 565 continue; 566 return s; 567 } 568 } 569 return NULL; 570 } 571 572 static void flush_stack(struct sock **stack, unsigned int count, 573 struct sk_buff *skb, unsigned int final) 574 { 575 unsigned int i; 576 struct sock *sk; 577 struct sk_buff *skb1; 578 579 for (i = 0; i < count; i++) { 580 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 581 582 sk = stack[i]; 583 if (skb1) { 584 bh_lock_sock(sk); 585 if (!sock_owned_by_user(sk)) 586 udpv6_queue_rcv_skb(sk, skb1); 587 else if (sk_add_backlog(sk, skb1)) { 588 kfree_skb(skb1); 589 bh_unlock_sock(sk); 590 goto drop; 591 } 592 bh_unlock_sock(sk); 593 continue; 594 } 595 drop: 596 atomic_inc(&sk->sk_drops); 597 UDP6_INC_STATS_BH(sock_net(sk), 598 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk)); 599 UDP6_INC_STATS_BH(sock_net(sk), 600 UDP_MIB_INERRORS, IS_UDPLITE(sk)); 601 } 602 } 603 /* 604 * Note: called only from the BH handler context, 605 * so we don't need to lock the hashes. 606 */ 607 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 608 struct in6_addr *saddr, struct in6_addr *daddr, 609 struct udp_table *udptable) 610 { 611 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 612 const struct udphdr *uh = udp_hdr(skb); 613 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 614 int dif; 615 unsigned int i, count = 0; 616 617 spin_lock(&hslot->lock); 618 sk = sk_nulls_head(&hslot->head); 619 dif = inet6_iif(skb); 620 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 621 while (sk) { 622 stack[count++] = sk; 623 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 624 uh->source, saddr, dif); 625 if (unlikely(count == ARRAY_SIZE(stack))) { 626 if (!sk) 627 break; 628 flush_stack(stack, count, skb, ~0); 629 count = 0; 630 } 631 } 632 /* 633 * before releasing the lock, we must take reference on sockets 634 */ 635 for (i = 0; i < count; i++) 636 sock_hold(stack[i]); 637 638 spin_unlock(&hslot->lock); 639 640 if (count) { 641 flush_stack(stack, count, skb, count - 1); 642 643 for (i = 0; i < count; i++) 644 sock_put(stack[i]); 645 } else { 646 kfree_skb(skb); 647 } 648 return 0; 649 } 650 651 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 652 int proto) 653 { 654 int err; 655 656 UDP_SKB_CB(skb)->partial_cov = 0; 657 UDP_SKB_CB(skb)->cscov = skb->len; 658 659 if (proto == IPPROTO_UDPLITE) { 660 err = udplite_checksum_init(skb, uh); 661 if (err) 662 return err; 663 } 664 665 if (uh->check == 0) { 666 /* RFC 2460 section 8.1 says that we SHOULD log 667 this error. Well, it is reasonable. 668 */ 669 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 670 return 1; 671 } 672 if (skb->ip_summed == CHECKSUM_COMPLETE && 673 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 674 skb->len, proto, skb->csum)) 675 skb->ip_summed = CHECKSUM_UNNECESSARY; 676 677 if (!skb_csum_unnecessary(skb)) 678 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 679 &ipv6_hdr(skb)->daddr, 680 skb->len, proto, 0)); 681 682 return 0; 683 } 684 685 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 686 int proto) 687 { 688 struct net *net = dev_net(skb->dev); 689 struct sock *sk; 690 struct udphdr *uh; 691 struct in6_addr *saddr, *daddr; 692 u32 ulen = 0; 693 694 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 695 goto short_packet; 696 697 saddr = &ipv6_hdr(skb)->saddr; 698 daddr = &ipv6_hdr(skb)->daddr; 699 uh = udp_hdr(skb); 700 701 ulen = ntohs(uh->len); 702 if (ulen > skb->len) 703 goto short_packet; 704 705 if (proto == IPPROTO_UDP) { 706 /* UDP validates ulen. */ 707 708 /* Check for jumbo payload */ 709 if (ulen == 0) 710 ulen = skb->len; 711 712 if (ulen < sizeof(*uh)) 713 goto short_packet; 714 715 if (ulen < skb->len) { 716 if (pskb_trim_rcsum(skb, ulen)) 717 goto short_packet; 718 saddr = &ipv6_hdr(skb)->saddr; 719 daddr = &ipv6_hdr(skb)->daddr; 720 uh = udp_hdr(skb); 721 } 722 } 723 724 if (udp6_csum_init(skb, uh, proto)) 725 goto discard; 726 727 /* 728 * Multicast receive code 729 */ 730 if (ipv6_addr_is_multicast(daddr)) 731 return __udp6_lib_mcast_deliver(net, skb, 732 saddr, daddr, udptable); 733 734 /* Unicast */ 735 736 /* 737 * check socket cache ... must talk to Alan about his plans 738 * for sock caches... i'll skip this for now. 739 */ 740 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 741 742 if (sk == NULL) { 743 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 744 goto discard; 745 746 if (udp_lib_checksum_complete(skb)) 747 goto discard; 748 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, 749 proto == IPPROTO_UDPLITE); 750 751 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 752 753 kfree_skb(skb); 754 return 0; 755 } 756 757 /* deliver */ 758 759 bh_lock_sock(sk); 760 if (!sock_owned_by_user(sk)) 761 udpv6_queue_rcv_skb(sk, skb); 762 else if (sk_add_backlog(sk, skb)) { 763 atomic_inc(&sk->sk_drops); 764 bh_unlock_sock(sk); 765 sock_put(sk); 766 goto discard; 767 } 768 bh_unlock_sock(sk); 769 sock_put(sk); 770 return 0; 771 772 short_packet: 773 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 774 proto == IPPROTO_UDPLITE ? "-Lite" : "", 775 ulen, skb->len); 776 777 discard: 778 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 779 kfree_skb(skb); 780 return 0; 781 } 782 783 static __inline__ int udpv6_rcv(struct sk_buff *skb) 784 { 785 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 786 } 787 788 /* 789 * Throw away all pending data and cancel the corking. Socket is locked. 790 */ 791 static void udp_v6_flush_pending_frames(struct sock *sk) 792 { 793 struct udp_sock *up = udp_sk(sk); 794 795 if (up->pending == AF_INET) 796 udp_flush_pending_frames(sk); 797 else if (up->pending) { 798 up->len = 0; 799 up->pending = 0; 800 ip6_flush_pending_frames(sk); 801 } 802 } 803 804 /** 805 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 806 * @sk: socket we are sending on 807 * @skb: sk_buff containing the filled-in UDP header 808 * (checksum field must be zeroed out) 809 */ 810 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 811 const struct in6_addr *saddr, 812 const struct in6_addr *daddr, int len) 813 { 814 unsigned int offset; 815 struct udphdr *uh = udp_hdr(skb); 816 __wsum csum = 0; 817 818 if (skb_queue_len(&sk->sk_write_queue) == 1) { 819 /* Only one fragment on the socket. */ 820 skb->csum_start = skb_transport_header(skb) - skb->head; 821 skb->csum_offset = offsetof(struct udphdr, check); 822 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 823 } else { 824 /* 825 * HW-checksum won't work as there are two or more 826 * fragments on the socket so that all csums of sk_buffs 827 * should be together 828 */ 829 offset = skb_transport_offset(skb); 830 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 831 832 skb->ip_summed = CHECKSUM_NONE; 833 834 skb_queue_walk(&sk->sk_write_queue, skb) { 835 csum = csum_add(csum, skb->csum); 836 } 837 838 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 839 csum); 840 if (uh->check == 0) 841 uh->check = CSUM_MANGLED_0; 842 } 843 } 844 845 /* 846 * Sending 847 */ 848 849 static int udp_v6_push_pending_frames(struct sock *sk) 850 { 851 struct sk_buff *skb; 852 struct udphdr *uh; 853 struct udp_sock *up = udp_sk(sk); 854 struct inet_sock *inet = inet_sk(sk); 855 struct flowi *fl = &inet->cork.fl; 856 int err = 0; 857 int is_udplite = IS_UDPLITE(sk); 858 __wsum csum = 0; 859 860 /* Grab the skbuff where UDP header space exists. */ 861 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 862 goto out; 863 864 /* 865 * Create a UDP header 866 */ 867 uh = udp_hdr(skb); 868 uh->source = fl->fl_ip_sport; 869 uh->dest = fl->fl_ip_dport; 870 uh->len = htons(up->len); 871 uh->check = 0; 872 873 if (is_udplite) 874 csum = udplite_csum_outgoing(sk, skb); 875 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 876 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst, 877 up->len); 878 goto send; 879 } else 880 csum = udp_csum_outgoing(sk, skb); 881 882 /* add protocol-dependent pseudo-header */ 883 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 884 up->len, fl->proto, csum ); 885 if (uh->check == 0) 886 uh->check = CSUM_MANGLED_0; 887 888 send: 889 err = ip6_push_pending_frames(sk); 890 if (err) { 891 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 892 UDP6_INC_STATS_USER(sock_net(sk), 893 UDP_MIB_SNDBUFERRORS, is_udplite); 894 err = 0; 895 } 896 } else 897 UDP6_INC_STATS_USER(sock_net(sk), 898 UDP_MIB_OUTDATAGRAMS, is_udplite); 899 out: 900 up->len = 0; 901 up->pending = 0; 902 return err; 903 } 904 905 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 906 struct msghdr *msg, size_t len) 907 { 908 struct ipv6_txoptions opt_space; 909 struct udp_sock *up = udp_sk(sk); 910 struct inet_sock *inet = inet_sk(sk); 911 struct ipv6_pinfo *np = inet6_sk(sk); 912 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 913 struct in6_addr *daddr, *final_p = NULL, final; 914 struct ipv6_txoptions *opt = NULL; 915 struct ip6_flowlabel *flowlabel = NULL; 916 struct flowi fl; 917 struct dst_entry *dst; 918 int addr_len = msg->msg_namelen; 919 int ulen = len; 920 int hlimit = -1; 921 int tclass = -1; 922 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 923 int err; 924 int connected = 0; 925 int is_udplite = IS_UDPLITE(sk); 926 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 927 928 /* destination address check */ 929 if (sin6) { 930 if (addr_len < offsetof(struct sockaddr, sa_data)) 931 return -EINVAL; 932 933 switch (sin6->sin6_family) { 934 case AF_INET6: 935 if (addr_len < SIN6_LEN_RFC2133) 936 return -EINVAL; 937 daddr = &sin6->sin6_addr; 938 break; 939 case AF_INET: 940 goto do_udp_sendmsg; 941 case AF_UNSPEC: 942 msg->msg_name = sin6 = NULL; 943 msg->msg_namelen = addr_len = 0; 944 daddr = NULL; 945 break; 946 default: 947 return -EINVAL; 948 } 949 } else if (!up->pending) { 950 if (sk->sk_state != TCP_ESTABLISHED) 951 return -EDESTADDRREQ; 952 daddr = &np->daddr; 953 } else 954 daddr = NULL; 955 956 if (daddr) { 957 if (ipv6_addr_v4mapped(daddr)) { 958 struct sockaddr_in sin; 959 sin.sin_family = AF_INET; 960 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 961 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 962 msg->msg_name = &sin; 963 msg->msg_namelen = sizeof(sin); 964 do_udp_sendmsg: 965 if (__ipv6_only_sock(sk)) 966 return -ENETUNREACH; 967 return udp_sendmsg(iocb, sk, msg, len); 968 } 969 } 970 971 if (up->pending == AF_INET) 972 return udp_sendmsg(iocb, sk, msg, len); 973 974 /* Rough check on arithmetic overflow, 975 better check is made in ip6_append_data(). 976 */ 977 if (len > INT_MAX - sizeof(struct udphdr)) 978 return -EMSGSIZE; 979 980 if (up->pending) { 981 /* 982 * There are pending frames. 983 * The socket lock must be held while it's corked. 984 */ 985 lock_sock(sk); 986 if (likely(up->pending)) { 987 if (unlikely(up->pending != AF_INET6)) { 988 release_sock(sk); 989 return -EAFNOSUPPORT; 990 } 991 dst = NULL; 992 goto do_append_data; 993 } 994 release_sock(sk); 995 } 996 ulen += sizeof(struct udphdr); 997 998 memset(&fl, 0, sizeof(fl)); 999 1000 if (sin6) { 1001 if (sin6->sin6_port == 0) 1002 return -EINVAL; 1003 1004 fl.fl_ip_dport = sin6->sin6_port; 1005 daddr = &sin6->sin6_addr; 1006 1007 if (np->sndflow) { 1008 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1009 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 1010 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 1011 if (flowlabel == NULL) 1012 return -EINVAL; 1013 daddr = &flowlabel->dst; 1014 } 1015 } 1016 1017 /* 1018 * Otherwise it will be difficult to maintain 1019 * sk->sk_dst_cache. 1020 */ 1021 if (sk->sk_state == TCP_ESTABLISHED && 1022 ipv6_addr_equal(daddr, &np->daddr)) 1023 daddr = &np->daddr; 1024 1025 if (addr_len >= sizeof(struct sockaddr_in6) && 1026 sin6->sin6_scope_id && 1027 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 1028 fl.oif = sin6->sin6_scope_id; 1029 } else { 1030 if (sk->sk_state != TCP_ESTABLISHED) 1031 return -EDESTADDRREQ; 1032 1033 fl.fl_ip_dport = inet->inet_dport; 1034 daddr = &np->daddr; 1035 fl.fl6_flowlabel = np->flow_label; 1036 connected = 1; 1037 } 1038 1039 if (!fl.oif) 1040 fl.oif = sk->sk_bound_dev_if; 1041 1042 if (!fl.oif) 1043 fl.oif = np->sticky_pktinfo.ipi6_ifindex; 1044 1045 fl.mark = sk->sk_mark; 1046 1047 if (msg->msg_controllen) { 1048 opt = &opt_space; 1049 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1050 opt->tot_len = sizeof(*opt); 1051 1052 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); 1053 if (err < 0) { 1054 fl6_sock_release(flowlabel); 1055 return err; 1056 } 1057 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1058 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 1059 if (flowlabel == NULL) 1060 return -EINVAL; 1061 } 1062 if (!(opt->opt_nflen|opt->opt_flen)) 1063 opt = NULL; 1064 connected = 0; 1065 } 1066 if (opt == NULL) 1067 opt = np->opt; 1068 if (flowlabel) 1069 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1070 opt = ipv6_fixup_options(&opt_space, opt); 1071 1072 fl.proto = sk->sk_protocol; 1073 if (!ipv6_addr_any(daddr)) 1074 ipv6_addr_copy(&fl.fl6_dst, daddr); 1075 else 1076 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1077 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 1078 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 1079 fl.fl_ip_sport = inet->inet_sport; 1080 1081 /* merge ip6_build_xmit from ip6_output */ 1082 if (opt && opt->srcrt) { 1083 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 1084 ipv6_addr_copy(&final, &fl.fl6_dst); 1085 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 1086 final_p = &final; 1087 connected = 0; 1088 } 1089 1090 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 1091 fl.oif = np->mcast_oif; 1092 connected = 0; 1093 } 1094 1095 security_sk_classify_flow(sk, &fl); 1096 1097 err = ip6_sk_dst_lookup(sk, &dst, &fl); 1098 if (err) 1099 goto out; 1100 if (final_p) 1101 ipv6_addr_copy(&fl.fl6_dst, final_p); 1102 1103 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 1104 if (err < 0) { 1105 if (err == -EREMOTE) 1106 err = ip6_dst_blackhole(sk, &dst, &fl); 1107 if (err < 0) 1108 goto out; 1109 } 1110 1111 if (hlimit < 0) { 1112 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 1113 hlimit = np->mcast_hops; 1114 else 1115 hlimit = np->hop_limit; 1116 if (hlimit < 0) 1117 hlimit = ip6_dst_hoplimit(dst); 1118 } 1119 1120 if (tclass < 0) 1121 tclass = np->tclass; 1122 1123 if (msg->msg_flags&MSG_CONFIRM) 1124 goto do_confirm; 1125 back_from_confirm: 1126 1127 lock_sock(sk); 1128 if (unlikely(up->pending)) { 1129 /* The socket is already corked while preparing it. */ 1130 /* ... which is an evident application bug. --ANK */ 1131 release_sock(sk); 1132 1133 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1134 err = -EINVAL; 1135 goto out; 1136 } 1137 1138 up->pending = AF_INET6; 1139 1140 do_append_data: 1141 up->len += ulen; 1142 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1143 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1144 sizeof(struct udphdr), hlimit, tclass, opt, &fl, 1145 (struct rt6_info*)dst, 1146 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1147 if (err) 1148 udp_v6_flush_pending_frames(sk); 1149 else if (!corkreq) 1150 err = udp_v6_push_pending_frames(sk); 1151 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1152 up->pending = 0; 1153 1154 if (dst) { 1155 if (connected) { 1156 ip6_dst_store(sk, dst, 1157 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 1158 &np->daddr : NULL, 1159 #ifdef CONFIG_IPV6_SUBTREES 1160 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 1161 &np->saddr : 1162 #endif 1163 NULL); 1164 } else { 1165 dst_release(dst); 1166 } 1167 dst = NULL; 1168 } 1169 1170 if (err > 0) 1171 err = np->recverr ? net_xmit_errno(err) : 0; 1172 release_sock(sk); 1173 out: 1174 dst_release(dst); 1175 fl6_sock_release(flowlabel); 1176 if (!err) 1177 return len; 1178 /* 1179 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1180 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1181 * we don't have a good statistic (IpOutDiscards but it can be too many 1182 * things). We could add another new stat but at least for now that 1183 * seems like overkill. 1184 */ 1185 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1186 UDP6_INC_STATS_USER(sock_net(sk), 1187 UDP_MIB_SNDBUFERRORS, is_udplite); 1188 } 1189 return err; 1190 1191 do_confirm: 1192 dst_confirm(dst); 1193 if (!(msg->msg_flags&MSG_PROBE) || len) 1194 goto back_from_confirm; 1195 err = 0; 1196 goto out; 1197 } 1198 1199 void udpv6_destroy_sock(struct sock *sk) 1200 { 1201 lock_sock(sk); 1202 udp_v6_flush_pending_frames(sk); 1203 release_sock(sk); 1204 1205 inet6_destroy_sock(sk); 1206 } 1207 1208 /* 1209 * Socket option code for UDP 1210 */ 1211 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1212 char __user *optval, unsigned int optlen) 1213 { 1214 if (level == SOL_UDP || level == SOL_UDPLITE) 1215 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1216 udp_v6_push_pending_frames); 1217 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1218 } 1219 1220 #ifdef CONFIG_COMPAT 1221 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1222 char __user *optval, unsigned int optlen) 1223 { 1224 if (level == SOL_UDP || level == SOL_UDPLITE) 1225 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1226 udp_v6_push_pending_frames); 1227 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1228 } 1229 #endif 1230 1231 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1232 char __user *optval, int __user *optlen) 1233 { 1234 if (level == SOL_UDP || level == SOL_UDPLITE) 1235 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1236 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1237 } 1238 1239 #ifdef CONFIG_COMPAT 1240 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1241 char __user *optval, int __user *optlen) 1242 { 1243 if (level == SOL_UDP || level == SOL_UDPLITE) 1244 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1245 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1246 } 1247 #endif 1248 1249 static int udp6_ufo_send_check(struct sk_buff *skb) 1250 { 1251 struct ipv6hdr *ipv6h; 1252 struct udphdr *uh; 1253 1254 if (!pskb_may_pull(skb, sizeof(*uh))) 1255 return -EINVAL; 1256 1257 ipv6h = ipv6_hdr(skb); 1258 uh = udp_hdr(skb); 1259 1260 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, 1261 IPPROTO_UDP, 0); 1262 skb->csum_start = skb_transport_header(skb) - skb->head; 1263 skb->csum_offset = offsetof(struct udphdr, check); 1264 skb->ip_summed = CHECKSUM_PARTIAL; 1265 return 0; 1266 } 1267 1268 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features) 1269 { 1270 struct sk_buff *segs = ERR_PTR(-EINVAL); 1271 unsigned int mss; 1272 unsigned int unfrag_ip6hlen, unfrag_len; 1273 struct frag_hdr *fptr; 1274 u8 *mac_start, *prevhdr; 1275 u8 nexthdr; 1276 u8 frag_hdr_sz = sizeof(struct frag_hdr); 1277 int offset; 1278 __wsum csum; 1279 1280 mss = skb_shinfo(skb)->gso_size; 1281 if (unlikely(skb->len <= mss)) 1282 goto out; 1283 1284 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { 1285 /* Packet is from an untrusted source, reset gso_segs. */ 1286 int type = skb_shinfo(skb)->gso_type; 1287 1288 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || 1289 !(type & (SKB_GSO_UDP)))) 1290 goto out; 1291 1292 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); 1293 1294 segs = NULL; 1295 goto out; 1296 } 1297 1298 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot 1299 * do checksum of UDP packets sent as multiple IP fragments. 1300 */ 1301 offset = skb->csum_start - skb_headroom(skb); 1302 csum = skb_checksum(skb, offset, skb->len- offset, 0); 1303 offset += skb->csum_offset; 1304 *(__sum16 *)(skb->data + offset) = csum_fold(csum); 1305 skb->ip_summed = CHECKSUM_NONE; 1306 1307 /* Check if there is enough headroom to insert fragment header. */ 1308 if ((skb_headroom(skb) < frag_hdr_sz) && 1309 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) 1310 goto out; 1311 1312 /* Find the unfragmentable header and shift it left by frag_hdr_sz 1313 * bytes to insert fragment header. 1314 */ 1315 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 1316 nexthdr = *prevhdr; 1317 *prevhdr = NEXTHDR_FRAGMENT; 1318 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + 1319 unfrag_ip6hlen; 1320 mac_start = skb_mac_header(skb); 1321 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); 1322 1323 skb->mac_header -= frag_hdr_sz; 1324 skb->network_header -= frag_hdr_sz; 1325 1326 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); 1327 fptr->nexthdr = nexthdr; 1328 fptr->reserved = 0; 1329 ipv6_select_ident(fptr); 1330 1331 /* Fragment the skb. ipv6 header and the remaining fields of the 1332 * fragment header are updated in ipv6_gso_segment() 1333 */ 1334 segs = skb_segment(skb, features); 1335 1336 out: 1337 return segs; 1338 } 1339 1340 static const struct inet6_protocol udpv6_protocol = { 1341 .handler = udpv6_rcv, 1342 .err_handler = udpv6_err, 1343 .gso_send_check = udp6_ufo_send_check, 1344 .gso_segment = udp6_ufo_fragment, 1345 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1346 }; 1347 1348 /* ------------------------------------------------------------------------ */ 1349 #ifdef CONFIG_PROC_FS 1350 1351 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1352 { 1353 struct inet_sock *inet = inet_sk(sp); 1354 struct ipv6_pinfo *np = inet6_sk(sp); 1355 struct in6_addr *dest, *src; 1356 __u16 destp, srcp; 1357 1358 dest = &np->daddr; 1359 src = &np->rcv_saddr; 1360 destp = ntohs(inet->inet_dport); 1361 srcp = ntohs(inet->inet_sport); 1362 seq_printf(seq, 1363 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1364 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1365 bucket, 1366 src->s6_addr32[0], src->s6_addr32[1], 1367 src->s6_addr32[2], src->s6_addr32[3], srcp, 1368 dest->s6_addr32[0], dest->s6_addr32[1], 1369 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1370 sp->sk_state, 1371 sk_wmem_alloc_get(sp), 1372 sk_rmem_alloc_get(sp), 1373 0, 0L, 0, 1374 sock_i_uid(sp), 0, 1375 sock_i_ino(sp), 1376 atomic_read(&sp->sk_refcnt), sp, 1377 atomic_read(&sp->sk_drops)); 1378 } 1379 1380 int udp6_seq_show(struct seq_file *seq, void *v) 1381 { 1382 if (v == SEQ_START_TOKEN) 1383 seq_printf(seq, 1384 " sl " 1385 "local_address " 1386 "remote_address " 1387 "st tx_queue rx_queue tr tm->when retrnsmt" 1388 " uid timeout inode ref pointer drops\n"); 1389 else 1390 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1391 return 0; 1392 } 1393 1394 static struct udp_seq_afinfo udp6_seq_afinfo = { 1395 .name = "udp6", 1396 .family = AF_INET6, 1397 .udp_table = &udp_table, 1398 .seq_fops = { 1399 .owner = THIS_MODULE, 1400 }, 1401 .seq_ops = { 1402 .show = udp6_seq_show, 1403 }, 1404 }; 1405 1406 int __net_init udp6_proc_init(struct net *net) 1407 { 1408 return udp_proc_register(net, &udp6_seq_afinfo); 1409 } 1410 1411 void udp6_proc_exit(struct net *net) { 1412 udp_proc_unregister(net, &udp6_seq_afinfo); 1413 } 1414 #endif /* CONFIG_PROC_FS */ 1415 1416 /* ------------------------------------------------------------------------ */ 1417 1418 struct proto udpv6_prot = { 1419 .name = "UDPv6", 1420 .owner = THIS_MODULE, 1421 .close = udp_lib_close, 1422 .connect = ip6_datagram_connect, 1423 .disconnect = udp_disconnect, 1424 .ioctl = udp_ioctl, 1425 .destroy = udpv6_destroy_sock, 1426 .setsockopt = udpv6_setsockopt, 1427 .getsockopt = udpv6_getsockopt, 1428 .sendmsg = udpv6_sendmsg, 1429 .recvmsg = udpv6_recvmsg, 1430 .backlog_rcv = udpv6_queue_rcv_skb, 1431 .hash = udp_lib_hash, 1432 .unhash = udp_lib_unhash, 1433 .get_port = udp_v6_get_port, 1434 .memory_allocated = &udp_memory_allocated, 1435 .sysctl_mem = sysctl_udp_mem, 1436 .sysctl_wmem = &sysctl_udp_wmem_min, 1437 .sysctl_rmem = &sysctl_udp_rmem_min, 1438 .obj_size = sizeof(struct udp6_sock), 1439 .slab_flags = SLAB_DESTROY_BY_RCU, 1440 .h.udp_table = &udp_table, 1441 #ifdef CONFIG_COMPAT 1442 .compat_setsockopt = compat_udpv6_setsockopt, 1443 .compat_getsockopt = compat_udpv6_getsockopt, 1444 #endif 1445 }; 1446 1447 static struct inet_protosw udpv6_protosw = { 1448 .type = SOCK_DGRAM, 1449 .protocol = IPPROTO_UDP, 1450 .prot = &udpv6_prot, 1451 .ops = &inet6_dgram_ops, 1452 .no_check = UDP_CSUM_DEFAULT, 1453 .flags = INET_PROTOSW_PERMANENT, 1454 }; 1455 1456 1457 int __init udpv6_init(void) 1458 { 1459 int ret; 1460 1461 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1462 if (ret) 1463 goto out; 1464 1465 ret = inet6_register_protosw(&udpv6_protosw); 1466 if (ret) 1467 goto out_udpv6_protocol; 1468 out: 1469 return ret; 1470 1471 out_udpv6_protocol: 1472 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1473 goto out; 1474 } 1475 1476 void udpv6_exit(void) 1477 { 1478 inet6_unregister_protosw(&udpv6_protosw); 1479 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1480 } 1481