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