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 = sk_rcv_saddr(sk); 58 __be32 sk2_rcv_saddr = sk_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((__force u32)addr6->s6_addr32[3], mix); 95 else 96 hash = jhash2((__force u32 *)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 void udp_v6_rehash(struct sock *sk) 115 { 116 u16 new_hash = udp6_portaddr_hash(sock_net(sk), 117 &inet6_sk(sk)->rcv_saddr, 118 inet_sk(sk)->inet_num); 119 120 udp_lib_rehash(sk, new_hash); 121 } 122 123 static inline int compute_score(struct sock *sk, struct net *net, 124 unsigned short hnum, 125 const struct in6_addr *saddr, __be16 sport, 126 const struct in6_addr *daddr, __be16 dport, 127 int dif) 128 { 129 int score = -1; 130 131 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 132 sk->sk_family == PF_INET6) { 133 struct ipv6_pinfo *np = inet6_sk(sk); 134 struct inet_sock *inet = inet_sk(sk); 135 136 score = 0; 137 if (inet->inet_dport) { 138 if (inet->inet_dport != sport) 139 return -1; 140 score++; 141 } 142 if (!ipv6_addr_any(&np->rcv_saddr)) { 143 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 144 return -1; 145 score++; 146 } 147 if (!ipv6_addr_any(&np->daddr)) { 148 if (!ipv6_addr_equal(&np->daddr, saddr)) 149 return -1; 150 score++; 151 } 152 if (sk->sk_bound_dev_if) { 153 if (sk->sk_bound_dev_if != dif) 154 return -1; 155 score++; 156 } 157 } 158 return score; 159 } 160 161 #define SCORE2_MAX (1 + 1 + 1) 162 static inline int compute_score2(struct sock *sk, struct net *net, 163 const struct in6_addr *saddr, __be16 sport, 164 const struct in6_addr *daddr, unsigned short hnum, 165 int dif) 166 { 167 int score = -1; 168 169 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 170 sk->sk_family == PF_INET6) { 171 struct ipv6_pinfo *np = inet6_sk(sk); 172 struct inet_sock *inet = inet_sk(sk); 173 174 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 175 return -1; 176 score = 0; 177 if (inet->inet_dport) { 178 if (inet->inet_dport != sport) 179 return -1; 180 score++; 181 } 182 if (!ipv6_addr_any(&np->daddr)) { 183 if (!ipv6_addr_equal(&np->daddr, saddr)) 184 return -1; 185 score++; 186 } 187 if (sk->sk_bound_dev_if) { 188 if (sk->sk_bound_dev_if != dif) 189 return -1; 190 score++; 191 } 192 } 193 return score; 194 } 195 196 197 /* called with read_rcu_lock() */ 198 static struct sock *udp6_lib_lookup2(struct net *net, 199 const struct in6_addr *saddr, __be16 sport, 200 const struct in6_addr *daddr, unsigned int hnum, int dif, 201 struct udp_hslot *hslot2, unsigned int slot2) 202 { 203 struct sock *sk, *result; 204 struct hlist_nulls_node *node; 205 int score, badness; 206 207 begin: 208 result = NULL; 209 badness = -1; 210 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 211 score = compute_score2(sk, net, saddr, sport, 212 daddr, hnum, dif); 213 if (score > badness) { 214 result = sk; 215 badness = score; 216 if (score == SCORE2_MAX) 217 goto exact_match; 218 } 219 } 220 /* 221 * if the nulls value we got at the end of this lookup is 222 * not the expected one, we must restart lookup. 223 * We probably met an item that was moved to another chain. 224 */ 225 if (get_nulls_value(node) != slot2) 226 goto begin; 227 228 if (result) { 229 exact_match: 230 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 231 result = NULL; 232 else if (unlikely(compute_score2(result, net, saddr, sport, 233 daddr, hnum, dif) < badness)) { 234 sock_put(result); 235 goto begin; 236 } 237 } 238 return result; 239 } 240 241 static struct sock *__udp6_lib_lookup(struct net *net, 242 const struct in6_addr *saddr, __be16 sport, 243 const struct in6_addr *daddr, __be16 dport, 244 int dif, struct udp_table *udptable) 245 { 246 struct sock *sk, *result; 247 struct hlist_nulls_node *node; 248 unsigned short hnum = ntohs(dport); 249 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 250 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 251 int score, badness; 252 253 rcu_read_lock(); 254 if (hslot->count > 10) { 255 hash2 = udp6_portaddr_hash(net, daddr, hnum); 256 slot2 = hash2 & udptable->mask; 257 hslot2 = &udptable->hash2[slot2]; 258 if (hslot->count < hslot2->count) 259 goto begin; 260 261 result = udp6_lib_lookup2(net, saddr, sport, 262 daddr, hnum, dif, 263 hslot2, slot2); 264 if (!result) { 265 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); 266 slot2 = hash2 & udptable->mask; 267 hslot2 = &udptable->hash2[slot2]; 268 if (hslot->count < hslot2->count) 269 goto begin; 270 271 result = udp6_lib_lookup2(net, saddr, sport, 272 &in6addr_any, hnum, dif, 273 hslot2, slot2); 274 } 275 rcu_read_unlock(); 276 return result; 277 } 278 begin: 279 result = NULL; 280 badness = -1; 281 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 282 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 283 if (score > badness) { 284 result = sk; 285 badness = score; 286 } 287 } 288 /* 289 * if the nulls value we got at the end of this lookup is 290 * not the expected one, we must restart lookup. 291 * We probably met an item that was moved to another chain. 292 */ 293 if (get_nulls_value(node) != slot) 294 goto begin; 295 296 if (result) { 297 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) 298 result = NULL; 299 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 300 daddr, dport, dif) < badness)) { 301 sock_put(result); 302 goto begin; 303 } 304 } 305 rcu_read_unlock(); 306 return result; 307 } 308 309 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 310 __be16 sport, __be16 dport, 311 struct udp_table *udptable) 312 { 313 struct sock *sk; 314 const struct ipv6hdr *iph = ipv6_hdr(skb); 315 316 if (unlikely(sk = skb_steal_sock(skb))) 317 return sk; 318 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 319 &iph->daddr, dport, inet6_iif(skb), 320 udptable); 321 } 322 323 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, 324 const struct in6_addr *daddr, __be16 dport, int dif) 325 { 326 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); 327 } 328 EXPORT_SYMBOL_GPL(udp6_lib_lookup); 329 330 331 /* 332 * This should be easy, if there is something there we 333 * return it, otherwise we block. 334 */ 335 336 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 337 struct msghdr *msg, size_t len, 338 int noblock, int flags, int *addr_len) 339 { 340 struct ipv6_pinfo *np = inet6_sk(sk); 341 struct inet_sock *inet = inet_sk(sk); 342 struct sk_buff *skb; 343 unsigned int ulen; 344 int peeked; 345 int err; 346 int is_udplite = IS_UDPLITE(sk); 347 int is_udp4; 348 bool slow; 349 350 if (addr_len) 351 *addr_len=sizeof(struct sockaddr_in6); 352 353 if (flags & MSG_ERRQUEUE) 354 return ipv6_recv_error(sk, msg, len); 355 356 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 357 return ipv6_recv_rxpmtu(sk, msg, len); 358 359 try_again: 360 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 361 &peeked, &err); 362 if (!skb) 363 goto out; 364 365 ulen = skb->len - sizeof(struct udphdr); 366 if (len > ulen) 367 len = ulen; 368 else if (len < ulen) 369 msg->msg_flags |= MSG_TRUNC; 370 371 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 372 373 /* 374 * If checksum is needed at all, try to do it while copying the 375 * data. If the data is truncated, or if we only want a partial 376 * coverage checksum (UDP-Lite), do it before the copy. 377 */ 378 379 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) { 380 if (udp_lib_checksum_complete(skb)) 381 goto csum_copy_err; 382 } 383 384 if (skb_csum_unnecessary(skb)) 385 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 386 msg->msg_iov,len); 387 else { 388 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 389 if (err == -EINVAL) 390 goto csum_copy_err; 391 } 392 if (err) 393 goto out_free; 394 395 if (!peeked) { 396 if (is_udp4) 397 UDP_INC_STATS_USER(sock_net(sk), 398 UDP_MIB_INDATAGRAMS, is_udplite); 399 else 400 UDP6_INC_STATS_USER(sock_net(sk), 401 UDP_MIB_INDATAGRAMS, is_udplite); 402 } 403 404 sock_recv_ts_and_drops(msg, sk, skb); 405 406 /* Copy the address. */ 407 if (msg->msg_name) { 408 struct sockaddr_in6 *sin6; 409 410 sin6 = (struct sockaddr_in6 *) msg->msg_name; 411 sin6->sin6_family = AF_INET6; 412 sin6->sin6_port = udp_hdr(skb)->source; 413 sin6->sin6_flowinfo = 0; 414 sin6->sin6_scope_id = 0; 415 416 if (is_udp4) 417 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 418 &sin6->sin6_addr); 419 else { 420 ipv6_addr_copy(&sin6->sin6_addr, 421 &ipv6_hdr(skb)->saddr); 422 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 423 sin6->sin6_scope_id = IP6CB(skb)->iif; 424 } 425 426 } 427 if (is_udp4) { 428 if (inet->cmsg_flags) 429 ip_cmsg_recv(msg, skb); 430 } else { 431 if (np->rxopt.all) 432 datagram_recv_ctl(sk, msg, skb); 433 } 434 435 err = len; 436 if (flags & MSG_TRUNC) 437 err = ulen; 438 439 out_free: 440 skb_free_datagram_locked(sk, skb); 441 out: 442 return err; 443 444 csum_copy_err: 445 slow = lock_sock_fast(sk); 446 if (!skb_kill_datagram(sk, skb, flags)) { 447 if (is_udp4) 448 UDP_INC_STATS_USER(sock_net(sk), 449 UDP_MIB_INERRORS, is_udplite); 450 else 451 UDP6_INC_STATS_USER(sock_net(sk), 452 UDP_MIB_INERRORS, is_udplite); 453 } 454 unlock_sock_fast(sk, slow); 455 456 if (noblock) 457 return -EAGAIN; 458 459 /* starting over for a new packet */ 460 msg->msg_flags &= ~MSG_TRUNC; 461 goto try_again; 462 } 463 464 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 465 u8 type, u8 code, int offset, __be32 info, 466 struct udp_table *udptable) 467 { 468 struct ipv6_pinfo *np; 469 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; 470 const struct in6_addr *saddr = &hdr->saddr; 471 const struct in6_addr *daddr = &hdr->daddr; 472 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 473 struct sock *sk; 474 int err; 475 476 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 477 saddr, uh->source, inet6_iif(skb), udptable); 478 if (sk == NULL) 479 return; 480 481 np = inet6_sk(sk); 482 483 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 484 goto out; 485 486 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 487 goto out; 488 489 if (np->recverr) 490 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 491 492 sk->sk_err = err; 493 sk->sk_error_report(sk); 494 out: 495 sock_put(sk); 496 } 497 498 static __inline__ void udpv6_err(struct sk_buff *skb, 499 struct inet6_skb_parm *opt, u8 type, 500 u8 code, int offset, __be32 info ) 501 { 502 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 503 } 504 505 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 506 { 507 struct udp_sock *up = udp_sk(sk); 508 int rc; 509 int is_udplite = IS_UDPLITE(sk); 510 511 if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) 512 sock_rps_save_rxhash(sk, skb->rxhash); 513 514 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 515 goto drop; 516 517 /* 518 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 519 */ 520 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 521 522 if (up->pcrlen == 0) { /* full coverage was set */ 523 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 524 " %d while full coverage %d requested\n", 525 UDP_SKB_CB(skb)->cscov, skb->len); 526 goto drop; 527 } 528 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 529 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 530 "too small, need min %d\n", 531 UDP_SKB_CB(skb)->cscov, up->pcrlen); 532 goto drop; 533 } 534 } 535 536 if (rcu_dereference_raw(sk->sk_filter)) { 537 if (udp_lib_checksum_complete(skb)) 538 goto drop; 539 } 540 541 if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) { 542 /* Note that an ENOMEM error is charged twice */ 543 if (rc == -ENOMEM) 544 UDP6_INC_STATS_BH(sock_net(sk), 545 UDP_MIB_RCVBUFERRORS, is_udplite); 546 goto drop_no_sk_drops_inc; 547 } 548 549 return 0; 550 drop: 551 atomic_inc(&sk->sk_drops); 552 drop_no_sk_drops_inc: 553 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 554 kfree_skb(skb); 555 return -1; 556 } 557 558 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 559 __be16 loc_port, const struct in6_addr *loc_addr, 560 __be16 rmt_port, const struct in6_addr *rmt_addr, 561 int dif) 562 { 563 struct hlist_nulls_node *node; 564 struct sock *s = sk; 565 unsigned short num = ntohs(loc_port); 566 567 sk_nulls_for_each_from(s, node) { 568 struct inet_sock *inet = inet_sk(s); 569 570 if (!net_eq(sock_net(s), net)) 571 continue; 572 573 if (udp_sk(s)->udp_port_hash == num && 574 s->sk_family == PF_INET6) { 575 struct ipv6_pinfo *np = inet6_sk(s); 576 if (inet->inet_dport) { 577 if (inet->inet_dport != rmt_port) 578 continue; 579 } 580 if (!ipv6_addr_any(&np->daddr) && 581 !ipv6_addr_equal(&np->daddr, rmt_addr)) 582 continue; 583 584 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 585 continue; 586 587 if (!ipv6_addr_any(&np->rcv_saddr)) { 588 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 589 continue; 590 } 591 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 592 continue; 593 return s; 594 } 595 } 596 return NULL; 597 } 598 599 static void flush_stack(struct sock **stack, unsigned int count, 600 struct sk_buff *skb, unsigned int final) 601 { 602 unsigned int i; 603 struct sock *sk; 604 struct sk_buff *skb1; 605 606 for (i = 0; i < count; i++) { 607 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 608 609 sk = stack[i]; 610 if (skb1) { 611 if (sk_rcvqueues_full(sk, skb1)) { 612 kfree_skb(skb1); 613 goto drop; 614 } 615 bh_lock_sock(sk); 616 if (!sock_owned_by_user(sk)) 617 udpv6_queue_rcv_skb(sk, skb1); 618 else if (sk_add_backlog(sk, skb1)) { 619 kfree_skb(skb1); 620 bh_unlock_sock(sk); 621 goto drop; 622 } 623 bh_unlock_sock(sk); 624 continue; 625 } 626 drop: 627 atomic_inc(&sk->sk_drops); 628 UDP6_INC_STATS_BH(sock_net(sk), 629 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk)); 630 UDP6_INC_STATS_BH(sock_net(sk), 631 UDP_MIB_INERRORS, IS_UDPLITE(sk)); 632 } 633 } 634 /* 635 * Note: called only from the BH handler context, 636 * so we don't need to lock the hashes. 637 */ 638 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 639 const struct in6_addr *saddr, const struct in6_addr *daddr, 640 struct udp_table *udptable) 641 { 642 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 643 const struct udphdr *uh = udp_hdr(skb); 644 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 645 int dif; 646 unsigned int i, count = 0; 647 648 spin_lock(&hslot->lock); 649 sk = sk_nulls_head(&hslot->head); 650 dif = inet6_iif(skb); 651 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 652 while (sk) { 653 stack[count++] = sk; 654 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 655 uh->source, saddr, dif); 656 if (unlikely(count == ARRAY_SIZE(stack))) { 657 if (!sk) 658 break; 659 flush_stack(stack, count, skb, ~0); 660 count = 0; 661 } 662 } 663 /* 664 * before releasing the lock, we must take reference on sockets 665 */ 666 for (i = 0; i < count; i++) 667 sock_hold(stack[i]); 668 669 spin_unlock(&hslot->lock); 670 671 if (count) { 672 flush_stack(stack, count, skb, count - 1); 673 674 for (i = 0; i < count; i++) 675 sock_put(stack[i]); 676 } else { 677 kfree_skb(skb); 678 } 679 return 0; 680 } 681 682 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 683 int proto) 684 { 685 int err; 686 687 UDP_SKB_CB(skb)->partial_cov = 0; 688 UDP_SKB_CB(skb)->cscov = skb->len; 689 690 if (proto == IPPROTO_UDPLITE) { 691 err = udplite_checksum_init(skb, uh); 692 if (err) 693 return err; 694 } 695 696 if (uh->check == 0) { 697 /* RFC 2460 section 8.1 says that we SHOULD log 698 this error. Well, it is reasonable. 699 */ 700 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 701 return 1; 702 } 703 if (skb->ip_summed == CHECKSUM_COMPLETE && 704 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 705 skb->len, proto, skb->csum)) 706 skb->ip_summed = CHECKSUM_UNNECESSARY; 707 708 if (!skb_csum_unnecessary(skb)) 709 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 710 &ipv6_hdr(skb)->daddr, 711 skb->len, proto, 0)); 712 713 return 0; 714 } 715 716 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 717 int proto) 718 { 719 struct net *net = dev_net(skb->dev); 720 struct sock *sk; 721 struct udphdr *uh; 722 const struct in6_addr *saddr, *daddr; 723 u32 ulen = 0; 724 725 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 726 goto discard; 727 728 saddr = &ipv6_hdr(skb)->saddr; 729 daddr = &ipv6_hdr(skb)->daddr; 730 uh = udp_hdr(skb); 731 732 ulen = ntohs(uh->len); 733 if (ulen > skb->len) 734 goto short_packet; 735 736 if (proto == IPPROTO_UDP) { 737 /* UDP validates ulen. */ 738 739 /* Check for jumbo payload */ 740 if (ulen == 0) 741 ulen = skb->len; 742 743 if (ulen < sizeof(*uh)) 744 goto short_packet; 745 746 if (ulen < skb->len) { 747 if (pskb_trim_rcsum(skb, ulen)) 748 goto short_packet; 749 saddr = &ipv6_hdr(skb)->saddr; 750 daddr = &ipv6_hdr(skb)->daddr; 751 uh = udp_hdr(skb); 752 } 753 } 754 755 if (udp6_csum_init(skb, uh, proto)) 756 goto discard; 757 758 /* 759 * Multicast receive code 760 */ 761 if (ipv6_addr_is_multicast(daddr)) 762 return __udp6_lib_mcast_deliver(net, skb, 763 saddr, daddr, udptable); 764 765 /* Unicast */ 766 767 /* 768 * check socket cache ... must talk to Alan about his plans 769 * for sock caches... i'll skip this for now. 770 */ 771 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 772 773 if (sk == NULL) { 774 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 775 goto discard; 776 777 if (udp_lib_checksum_complete(skb)) 778 goto discard; 779 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, 780 proto == IPPROTO_UDPLITE); 781 782 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 783 784 kfree_skb(skb); 785 return 0; 786 } 787 788 /* deliver */ 789 790 if (sk_rcvqueues_full(sk, skb)) { 791 sock_put(sk); 792 goto discard; 793 } 794 bh_lock_sock(sk); 795 if (!sock_owned_by_user(sk)) 796 udpv6_queue_rcv_skb(sk, skb); 797 else if (sk_add_backlog(sk, skb)) { 798 atomic_inc(&sk->sk_drops); 799 bh_unlock_sock(sk); 800 sock_put(sk); 801 goto discard; 802 } 803 bh_unlock_sock(sk); 804 sock_put(sk); 805 return 0; 806 807 short_packet: 808 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 809 proto == IPPROTO_UDPLITE ? "-Lite" : "", 810 saddr, 811 ntohs(uh->source), 812 ulen, 813 skb->len, 814 daddr, 815 ntohs(uh->dest)); 816 817 discard: 818 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 819 kfree_skb(skb); 820 return 0; 821 } 822 823 static __inline__ int udpv6_rcv(struct sk_buff *skb) 824 { 825 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 826 } 827 828 /* 829 * Throw away all pending data and cancel the corking. Socket is locked. 830 */ 831 static void udp_v6_flush_pending_frames(struct sock *sk) 832 { 833 struct udp_sock *up = udp_sk(sk); 834 835 if (up->pending == AF_INET) 836 udp_flush_pending_frames(sk); 837 else if (up->pending) { 838 up->len = 0; 839 up->pending = 0; 840 ip6_flush_pending_frames(sk); 841 } 842 } 843 844 /** 845 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 846 * @sk: socket we are sending on 847 * @skb: sk_buff containing the filled-in UDP header 848 * (checksum field must be zeroed out) 849 */ 850 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 851 const struct in6_addr *saddr, 852 const struct in6_addr *daddr, int len) 853 { 854 unsigned int offset; 855 struct udphdr *uh = udp_hdr(skb); 856 __wsum csum = 0; 857 858 if (skb_queue_len(&sk->sk_write_queue) == 1) { 859 /* Only one fragment on the socket. */ 860 skb->csum_start = skb_transport_header(skb) - skb->head; 861 skb->csum_offset = offsetof(struct udphdr, check); 862 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 863 } else { 864 /* 865 * HW-checksum won't work as there are two or more 866 * fragments on the socket so that all csums of sk_buffs 867 * should be together 868 */ 869 offset = skb_transport_offset(skb); 870 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 871 872 skb->ip_summed = CHECKSUM_NONE; 873 874 skb_queue_walk(&sk->sk_write_queue, skb) { 875 csum = csum_add(csum, skb->csum); 876 } 877 878 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 879 csum); 880 if (uh->check == 0) 881 uh->check = CSUM_MANGLED_0; 882 } 883 } 884 885 /* 886 * Sending 887 */ 888 889 static int udp_v6_push_pending_frames(struct sock *sk) 890 { 891 struct sk_buff *skb; 892 struct udphdr *uh; 893 struct udp_sock *up = udp_sk(sk); 894 struct inet_sock *inet = inet_sk(sk); 895 struct flowi6 *fl6 = &inet->cork.fl.u.ip6; 896 int err = 0; 897 int is_udplite = IS_UDPLITE(sk); 898 __wsum csum = 0; 899 900 /* Grab the skbuff where UDP header space exists. */ 901 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 902 goto out; 903 904 /* 905 * Create a UDP header 906 */ 907 uh = udp_hdr(skb); 908 uh->source = fl6->fl6_sport; 909 uh->dest = fl6->fl6_dport; 910 uh->len = htons(up->len); 911 uh->check = 0; 912 913 if (is_udplite) 914 csum = udplite_csum_outgoing(sk, skb); 915 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 916 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, 917 up->len); 918 goto send; 919 } else 920 csum = udp_csum_outgoing(sk, skb); 921 922 /* add protocol-dependent pseudo-header */ 923 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 924 up->len, fl6->flowi6_proto, csum); 925 if (uh->check == 0) 926 uh->check = CSUM_MANGLED_0; 927 928 send: 929 err = ip6_push_pending_frames(sk); 930 if (err) { 931 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 932 UDP6_INC_STATS_USER(sock_net(sk), 933 UDP_MIB_SNDBUFERRORS, is_udplite); 934 err = 0; 935 } 936 } else 937 UDP6_INC_STATS_USER(sock_net(sk), 938 UDP_MIB_OUTDATAGRAMS, is_udplite); 939 out: 940 up->len = 0; 941 up->pending = 0; 942 return err; 943 } 944 945 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 946 struct msghdr *msg, size_t len) 947 { 948 struct ipv6_txoptions opt_space; 949 struct udp_sock *up = udp_sk(sk); 950 struct inet_sock *inet = inet_sk(sk); 951 struct ipv6_pinfo *np = inet6_sk(sk); 952 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 953 struct in6_addr *daddr, *final_p, final; 954 struct ipv6_txoptions *opt = NULL; 955 struct ip6_flowlabel *flowlabel = NULL; 956 struct flowi6 fl6; 957 struct dst_entry *dst; 958 int addr_len = msg->msg_namelen; 959 int ulen = len; 960 int hlimit = -1; 961 int tclass = -1; 962 int dontfrag = -1; 963 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 964 int err; 965 int connected = 0; 966 int is_udplite = IS_UDPLITE(sk); 967 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 968 969 /* destination address check */ 970 if (sin6) { 971 if (addr_len < offsetof(struct sockaddr, sa_data)) 972 return -EINVAL; 973 974 switch (sin6->sin6_family) { 975 case AF_INET6: 976 if (addr_len < SIN6_LEN_RFC2133) 977 return -EINVAL; 978 daddr = &sin6->sin6_addr; 979 break; 980 case AF_INET: 981 goto do_udp_sendmsg; 982 case AF_UNSPEC: 983 msg->msg_name = sin6 = NULL; 984 msg->msg_namelen = addr_len = 0; 985 daddr = NULL; 986 break; 987 default: 988 return -EINVAL; 989 } 990 } else if (!up->pending) { 991 if (sk->sk_state != TCP_ESTABLISHED) 992 return -EDESTADDRREQ; 993 daddr = &np->daddr; 994 } else 995 daddr = NULL; 996 997 if (daddr) { 998 if (ipv6_addr_v4mapped(daddr)) { 999 struct sockaddr_in sin; 1000 sin.sin_family = AF_INET; 1001 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 1002 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 1003 msg->msg_name = &sin; 1004 msg->msg_namelen = sizeof(sin); 1005 do_udp_sendmsg: 1006 if (__ipv6_only_sock(sk)) 1007 return -ENETUNREACH; 1008 return udp_sendmsg(iocb, sk, msg, len); 1009 } 1010 } 1011 1012 if (up->pending == AF_INET) 1013 return udp_sendmsg(iocb, sk, msg, len); 1014 1015 /* Rough check on arithmetic overflow, 1016 better check is made in ip6_append_data(). 1017 */ 1018 if (len > INT_MAX - sizeof(struct udphdr)) 1019 return -EMSGSIZE; 1020 1021 if (up->pending) { 1022 /* 1023 * There are pending frames. 1024 * The socket lock must be held while it's corked. 1025 */ 1026 lock_sock(sk); 1027 if (likely(up->pending)) { 1028 if (unlikely(up->pending != AF_INET6)) { 1029 release_sock(sk); 1030 return -EAFNOSUPPORT; 1031 } 1032 dst = NULL; 1033 goto do_append_data; 1034 } 1035 release_sock(sk); 1036 } 1037 ulen += sizeof(struct udphdr); 1038 1039 memset(&fl6, 0, sizeof(fl6)); 1040 1041 if (sin6) { 1042 if (sin6->sin6_port == 0) 1043 return -EINVAL; 1044 1045 fl6.fl6_dport = sin6->sin6_port; 1046 daddr = &sin6->sin6_addr; 1047 1048 if (np->sndflow) { 1049 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1050 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 1051 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1052 if (flowlabel == NULL) 1053 return -EINVAL; 1054 daddr = &flowlabel->dst; 1055 } 1056 } 1057 1058 /* 1059 * Otherwise it will be difficult to maintain 1060 * sk->sk_dst_cache. 1061 */ 1062 if (sk->sk_state == TCP_ESTABLISHED && 1063 ipv6_addr_equal(daddr, &np->daddr)) 1064 daddr = &np->daddr; 1065 1066 if (addr_len >= sizeof(struct sockaddr_in6) && 1067 sin6->sin6_scope_id && 1068 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 1069 fl6.flowi6_oif = sin6->sin6_scope_id; 1070 } else { 1071 if (sk->sk_state != TCP_ESTABLISHED) 1072 return -EDESTADDRREQ; 1073 1074 fl6.fl6_dport = inet->inet_dport; 1075 daddr = &np->daddr; 1076 fl6.flowlabel = np->flow_label; 1077 connected = 1; 1078 } 1079 1080 if (!fl6.flowi6_oif) 1081 fl6.flowi6_oif = sk->sk_bound_dev_if; 1082 1083 if (!fl6.flowi6_oif) 1084 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; 1085 1086 fl6.flowi6_mark = sk->sk_mark; 1087 1088 if (msg->msg_controllen) { 1089 opt = &opt_space; 1090 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1091 opt->tot_len = sizeof(*opt); 1092 1093 err = datagram_send_ctl(sock_net(sk), msg, &fl6, opt, &hlimit, 1094 &tclass, &dontfrag); 1095 if (err < 0) { 1096 fl6_sock_release(flowlabel); 1097 return err; 1098 } 1099 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1100 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 1101 if (flowlabel == NULL) 1102 return -EINVAL; 1103 } 1104 if (!(opt->opt_nflen|opt->opt_flen)) 1105 opt = NULL; 1106 connected = 0; 1107 } 1108 if (opt == NULL) 1109 opt = np->opt; 1110 if (flowlabel) 1111 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1112 opt = ipv6_fixup_options(&opt_space, opt); 1113 1114 fl6.flowi6_proto = sk->sk_protocol; 1115 if (!ipv6_addr_any(daddr)) 1116 ipv6_addr_copy(&fl6.daddr, daddr); 1117 else 1118 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1119 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 1120 ipv6_addr_copy(&fl6.saddr, &np->saddr); 1121 fl6.fl6_sport = inet->inet_sport; 1122 1123 final_p = fl6_update_dst(&fl6, opt, &final); 1124 if (final_p) 1125 connected = 0; 1126 1127 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { 1128 fl6.flowi6_oif = np->mcast_oif; 1129 connected = 0; 1130 } 1131 1132 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 1133 1134 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); 1135 if (IS_ERR(dst)) { 1136 err = PTR_ERR(dst); 1137 dst = NULL; 1138 goto out; 1139 } 1140 1141 if (hlimit < 0) { 1142 if (ipv6_addr_is_multicast(&fl6.daddr)) 1143 hlimit = np->mcast_hops; 1144 else 1145 hlimit = np->hop_limit; 1146 if (hlimit < 0) 1147 hlimit = ip6_dst_hoplimit(dst); 1148 } 1149 1150 if (tclass < 0) 1151 tclass = np->tclass; 1152 1153 if (dontfrag < 0) 1154 dontfrag = np->dontfrag; 1155 1156 if (msg->msg_flags&MSG_CONFIRM) 1157 goto do_confirm; 1158 back_from_confirm: 1159 1160 lock_sock(sk); 1161 if (unlikely(up->pending)) { 1162 /* The socket is already corked while preparing it. */ 1163 /* ... which is an evident application bug. --ANK */ 1164 release_sock(sk); 1165 1166 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1167 err = -EINVAL; 1168 goto out; 1169 } 1170 1171 up->pending = AF_INET6; 1172 1173 do_append_data: 1174 up->len += ulen; 1175 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1176 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1177 sizeof(struct udphdr), hlimit, tclass, opt, &fl6, 1178 (struct rt6_info*)dst, 1179 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1180 if (err) 1181 udp_v6_flush_pending_frames(sk); 1182 else if (!corkreq) 1183 err = udp_v6_push_pending_frames(sk); 1184 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1185 up->pending = 0; 1186 1187 if (dst) { 1188 if (connected) { 1189 ip6_dst_store(sk, dst, 1190 ipv6_addr_equal(&fl6.daddr, &np->daddr) ? 1191 &np->daddr : NULL, 1192 #ifdef CONFIG_IPV6_SUBTREES 1193 ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1194 &np->saddr : 1195 #endif 1196 NULL); 1197 } else { 1198 dst_release(dst); 1199 } 1200 dst = NULL; 1201 } 1202 1203 if (err > 0) 1204 err = np->recverr ? net_xmit_errno(err) : 0; 1205 release_sock(sk); 1206 out: 1207 dst_release(dst); 1208 fl6_sock_release(flowlabel); 1209 if (!err) 1210 return len; 1211 /* 1212 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1213 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1214 * we don't have a good statistic (IpOutDiscards but it can be too many 1215 * things). We could add another new stat but at least for now that 1216 * seems like overkill. 1217 */ 1218 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1219 UDP6_INC_STATS_USER(sock_net(sk), 1220 UDP_MIB_SNDBUFERRORS, is_udplite); 1221 } 1222 return err; 1223 1224 do_confirm: 1225 dst_confirm(dst); 1226 if (!(msg->msg_flags&MSG_PROBE) || len) 1227 goto back_from_confirm; 1228 err = 0; 1229 goto out; 1230 } 1231 1232 void udpv6_destroy_sock(struct sock *sk) 1233 { 1234 lock_sock(sk); 1235 udp_v6_flush_pending_frames(sk); 1236 release_sock(sk); 1237 1238 inet6_destroy_sock(sk); 1239 } 1240 1241 /* 1242 * Socket option code for UDP 1243 */ 1244 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1245 char __user *optval, unsigned int optlen) 1246 { 1247 if (level == SOL_UDP || level == SOL_UDPLITE) 1248 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1249 udp_v6_push_pending_frames); 1250 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1251 } 1252 1253 #ifdef CONFIG_COMPAT 1254 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1255 char __user *optval, unsigned int optlen) 1256 { 1257 if (level == SOL_UDP || level == SOL_UDPLITE) 1258 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1259 udp_v6_push_pending_frames); 1260 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1261 } 1262 #endif 1263 1264 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1265 char __user *optval, int __user *optlen) 1266 { 1267 if (level == SOL_UDP || level == SOL_UDPLITE) 1268 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1269 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1270 } 1271 1272 #ifdef CONFIG_COMPAT 1273 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1274 char __user *optval, int __user *optlen) 1275 { 1276 if (level == SOL_UDP || level == SOL_UDPLITE) 1277 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1278 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1279 } 1280 #endif 1281 1282 static int udp6_ufo_send_check(struct sk_buff *skb) 1283 { 1284 const struct ipv6hdr *ipv6h; 1285 struct udphdr *uh; 1286 1287 if (!pskb_may_pull(skb, sizeof(*uh))) 1288 return -EINVAL; 1289 1290 ipv6h = ipv6_hdr(skb); 1291 uh = udp_hdr(skb); 1292 1293 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, 1294 IPPROTO_UDP, 0); 1295 skb->csum_start = skb_transport_header(skb) - skb->head; 1296 skb->csum_offset = offsetof(struct udphdr, check); 1297 skb->ip_summed = CHECKSUM_PARTIAL; 1298 return 0; 1299 } 1300 1301 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, u32 features) 1302 { 1303 struct sk_buff *segs = ERR_PTR(-EINVAL); 1304 unsigned int mss; 1305 unsigned int unfrag_ip6hlen, unfrag_len; 1306 struct frag_hdr *fptr; 1307 u8 *mac_start, *prevhdr; 1308 u8 nexthdr; 1309 u8 frag_hdr_sz = sizeof(struct frag_hdr); 1310 int offset; 1311 __wsum csum; 1312 1313 mss = skb_shinfo(skb)->gso_size; 1314 if (unlikely(skb->len <= mss)) 1315 goto out; 1316 1317 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { 1318 /* Packet is from an untrusted source, reset gso_segs. */ 1319 int type = skb_shinfo(skb)->gso_type; 1320 1321 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || 1322 !(type & (SKB_GSO_UDP)))) 1323 goto out; 1324 1325 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); 1326 1327 segs = NULL; 1328 goto out; 1329 } 1330 1331 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot 1332 * do checksum of UDP packets sent as multiple IP fragments. 1333 */ 1334 offset = skb_checksum_start_offset(skb); 1335 csum = skb_checksum(skb, offset, skb->len- offset, 0); 1336 offset += skb->csum_offset; 1337 *(__sum16 *)(skb->data + offset) = csum_fold(csum); 1338 skb->ip_summed = CHECKSUM_NONE; 1339 1340 /* Check if there is enough headroom to insert fragment header. */ 1341 if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) && 1342 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) 1343 goto out; 1344 1345 /* Find the unfragmentable header and shift it left by frag_hdr_sz 1346 * bytes to insert fragment header. 1347 */ 1348 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 1349 nexthdr = *prevhdr; 1350 *prevhdr = NEXTHDR_FRAGMENT; 1351 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + 1352 unfrag_ip6hlen; 1353 mac_start = skb_mac_header(skb); 1354 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); 1355 1356 skb->mac_header -= frag_hdr_sz; 1357 skb->network_header -= frag_hdr_sz; 1358 1359 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); 1360 fptr->nexthdr = nexthdr; 1361 fptr->reserved = 0; 1362 ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb)); 1363 1364 /* Fragment the skb. ipv6 header and the remaining fields of the 1365 * fragment header are updated in ipv6_gso_segment() 1366 */ 1367 segs = skb_segment(skb, features); 1368 1369 out: 1370 return segs; 1371 } 1372 1373 static const struct inet6_protocol udpv6_protocol = { 1374 .handler = udpv6_rcv, 1375 .err_handler = udpv6_err, 1376 .gso_send_check = udp6_ufo_send_check, 1377 .gso_segment = udp6_ufo_fragment, 1378 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1379 }; 1380 1381 /* ------------------------------------------------------------------------ */ 1382 #ifdef CONFIG_PROC_FS 1383 1384 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1385 { 1386 struct inet_sock *inet = inet_sk(sp); 1387 struct ipv6_pinfo *np = inet6_sk(sp); 1388 const struct in6_addr *dest, *src; 1389 __u16 destp, srcp; 1390 1391 dest = &np->daddr; 1392 src = &np->rcv_saddr; 1393 destp = ntohs(inet->inet_dport); 1394 srcp = ntohs(inet->inet_sport); 1395 seq_printf(seq, 1396 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1397 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1398 bucket, 1399 src->s6_addr32[0], src->s6_addr32[1], 1400 src->s6_addr32[2], src->s6_addr32[3], srcp, 1401 dest->s6_addr32[0], dest->s6_addr32[1], 1402 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1403 sp->sk_state, 1404 sk_wmem_alloc_get(sp), 1405 sk_rmem_alloc_get(sp), 1406 0, 0L, 0, 1407 sock_i_uid(sp), 0, 1408 sock_i_ino(sp), 1409 atomic_read(&sp->sk_refcnt), sp, 1410 atomic_read(&sp->sk_drops)); 1411 } 1412 1413 int udp6_seq_show(struct seq_file *seq, void *v) 1414 { 1415 if (v == SEQ_START_TOKEN) 1416 seq_printf(seq, 1417 " sl " 1418 "local_address " 1419 "remote_address " 1420 "st tx_queue rx_queue tr tm->when retrnsmt" 1421 " uid timeout inode ref pointer drops\n"); 1422 else 1423 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1424 return 0; 1425 } 1426 1427 static struct udp_seq_afinfo udp6_seq_afinfo = { 1428 .name = "udp6", 1429 .family = AF_INET6, 1430 .udp_table = &udp_table, 1431 .seq_fops = { 1432 .owner = THIS_MODULE, 1433 }, 1434 .seq_ops = { 1435 .show = udp6_seq_show, 1436 }, 1437 }; 1438 1439 int __net_init udp6_proc_init(struct net *net) 1440 { 1441 return udp_proc_register(net, &udp6_seq_afinfo); 1442 } 1443 1444 void udp6_proc_exit(struct net *net) { 1445 udp_proc_unregister(net, &udp6_seq_afinfo); 1446 } 1447 #endif /* CONFIG_PROC_FS */ 1448 1449 /* ------------------------------------------------------------------------ */ 1450 1451 struct proto udpv6_prot = { 1452 .name = "UDPv6", 1453 .owner = THIS_MODULE, 1454 .close = udp_lib_close, 1455 .connect = ip6_datagram_connect, 1456 .disconnect = udp_disconnect, 1457 .ioctl = udp_ioctl, 1458 .destroy = udpv6_destroy_sock, 1459 .setsockopt = udpv6_setsockopt, 1460 .getsockopt = udpv6_getsockopt, 1461 .sendmsg = udpv6_sendmsg, 1462 .recvmsg = udpv6_recvmsg, 1463 .backlog_rcv = udpv6_queue_rcv_skb, 1464 .hash = udp_lib_hash, 1465 .unhash = udp_lib_unhash, 1466 .rehash = udp_v6_rehash, 1467 .get_port = udp_v6_get_port, 1468 .memory_allocated = &udp_memory_allocated, 1469 .sysctl_mem = sysctl_udp_mem, 1470 .sysctl_wmem = &sysctl_udp_wmem_min, 1471 .sysctl_rmem = &sysctl_udp_rmem_min, 1472 .obj_size = sizeof(struct udp6_sock), 1473 .slab_flags = SLAB_DESTROY_BY_RCU, 1474 .h.udp_table = &udp_table, 1475 #ifdef CONFIG_COMPAT 1476 .compat_setsockopt = compat_udpv6_setsockopt, 1477 .compat_getsockopt = compat_udpv6_getsockopt, 1478 #endif 1479 .clear_sk = sk_prot_clear_portaddr_nulls, 1480 }; 1481 1482 static struct inet_protosw udpv6_protosw = { 1483 .type = SOCK_DGRAM, 1484 .protocol = IPPROTO_UDP, 1485 .prot = &udpv6_prot, 1486 .ops = &inet6_dgram_ops, 1487 .no_check = UDP_CSUM_DEFAULT, 1488 .flags = INET_PROTOSW_PERMANENT, 1489 }; 1490 1491 1492 int __init udpv6_init(void) 1493 { 1494 int ret; 1495 1496 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1497 if (ret) 1498 goto out; 1499 1500 ret = inet6_register_protosw(&udpv6_protosw); 1501 if (ret) 1502 goto out_udpv6_protocol; 1503 out: 1504 return ret; 1505 1506 out_udpv6_protocol: 1507 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1508 goto out; 1509 } 1510 1511 void udpv6_exit(void) 1512 { 1513 inet6_unregister_protosw(&udpv6_protosw); 1514 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1515 } 1516