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 53int 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 85static 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 102int 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 114static 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 123static inline int compute_score(struct sock *sk, struct net *net, 124 unsigned short hnum, 125 struct in6_addr *saddr, __be16 sport, 126 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) 162static 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() */ 198static 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 207begin: 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) { 229exact_match: 230 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) 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 241static struct sock *__udp6_lib_lookup(struct net *net, 242 struct in6_addr *saddr, __be16 sport, 243 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 } 278begin: 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(&result->sk_refcnt))) 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 309static 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 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/* 324 * This should be easy, if there is something there we 325 * return it, otherwise we block. 326 */ 327 328int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 329 struct msghdr *msg, size_t len, 330 int noblock, int flags, int *addr_len) 331{ 332 struct ipv6_pinfo *np = inet6_sk(sk); 333 struct inet_sock *inet = inet_sk(sk); 334 struct sk_buff *skb; 335 unsigned int ulen; 336 int peeked; 337 int err; 338 int is_udplite = IS_UDPLITE(sk); 339 int is_udp4; 340 bool slow; 341 342 if (addr_len) 343 *addr_len=sizeof(struct sockaddr_in6); 344 345 if (flags & MSG_ERRQUEUE) 346 return ipv6_recv_error(sk, msg, len); 347 348 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 349 return ipv6_recv_rxpmtu(sk, msg, len); 350 351try_again: 352 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 353 &peeked, &err); 354 if (!skb) 355 goto out; 356 357 ulen = skb->len - sizeof(struct udphdr); 358 if (len > ulen) 359 len = ulen; 360 else if (len < ulen) 361 msg->msg_flags |= MSG_TRUNC; 362 363 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 364 365 /* 366 * If checksum is needed at all, try to do it while copying the 367 * data. If the data is truncated, or if we only want a partial 368 * coverage checksum (UDP-Lite), do it before the copy. 369 */ 370 371 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) { 372 if (udp_lib_checksum_complete(skb)) 373 goto csum_copy_err; 374 } 375 376 if (skb_csum_unnecessary(skb)) 377 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 378 msg->msg_iov,len); 379 else { 380 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 381 if (err == -EINVAL) 382 goto csum_copy_err; 383 } 384 if (err) 385 goto out_free; 386 387 if (!peeked) { 388 if (is_udp4) 389 UDP_INC_STATS_USER(sock_net(sk), 390 UDP_MIB_INDATAGRAMS, is_udplite); 391 else 392 UDP6_INC_STATS_USER(sock_net(sk), 393 UDP_MIB_INDATAGRAMS, is_udplite); 394 } 395 396 sock_recv_ts_and_drops(msg, sk, skb); 397 398 /* Copy the address. */ 399 if (msg->msg_name) { 400 struct sockaddr_in6 *sin6; 401 402 sin6 = (struct sockaddr_in6 *) msg->msg_name; 403 sin6->sin6_family = AF_INET6; 404 sin6->sin6_port = udp_hdr(skb)->source; 405 sin6->sin6_flowinfo = 0; 406 sin6->sin6_scope_id = 0; 407 408 if (is_udp4) 409 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 410 &sin6->sin6_addr); 411 else { 412 ipv6_addr_copy(&sin6->sin6_addr, 413 &ipv6_hdr(skb)->saddr); 414 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 415 sin6->sin6_scope_id = IP6CB(skb)->iif; 416 } 417 418 } 419 if (is_udp4) { 420 if (inet->cmsg_flags) 421 ip_cmsg_recv(msg, skb); 422 } else { 423 if (np->rxopt.all) 424 datagram_recv_ctl(sk, msg, skb); 425 } 426 427 err = len; 428 if (flags & MSG_TRUNC) 429 err = ulen; 430 431out_free: 432 skb_free_datagram_locked(sk, skb); 433out: 434 return err; 435 436csum_copy_err: 437 slow = lock_sock_fast(sk); 438 if (!skb_kill_datagram(sk, skb, flags)) { 439 if (is_udp4) 440 UDP_INC_STATS_USER(sock_net(sk), 441 UDP_MIB_INERRORS, is_udplite); 442 else 443 UDP6_INC_STATS_USER(sock_net(sk), 444 UDP_MIB_INERRORS, is_udplite); 445 } 446 unlock_sock_fast(sk, slow); 447 448 if (flags & MSG_DONTWAIT) 449 return -EAGAIN; 450 goto try_again; 451} 452 453void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 454 u8 type, u8 code, int offset, __be32 info, 455 struct udp_table *udptable) 456{ 457 struct ipv6_pinfo *np; 458 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 459 struct in6_addr *saddr = &hdr->saddr; 460 struct in6_addr *daddr = &hdr->daddr; 461 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 462 struct sock *sk; 463 int err; 464 465 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 466 saddr, uh->source, inet6_iif(skb), udptable); 467 if (sk == NULL) 468 return; 469 470 np = inet6_sk(sk); 471 472 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 473 goto out; 474 475 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 476 goto out; 477 478 if (np->recverr) 479 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 480 481 sk->sk_err = err; 482 sk->sk_error_report(sk); 483out: 484 sock_put(sk); 485} 486 487static __inline__ void udpv6_err(struct sk_buff *skb, 488 struct inet6_skb_parm *opt, u8 type, 489 u8 code, int offset, __be32 info ) 490{ 491 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 492} 493 494int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 495{ 496 struct udp_sock *up = udp_sk(sk); 497 int rc; 498 int is_udplite = IS_UDPLITE(sk); 499 500 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 501 goto drop; 502 503 /* 504 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 505 */ 506 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 507 508 if (up->pcrlen == 0) { /* full coverage was set */ 509 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 510 " %d while full coverage %d requested\n", 511 UDP_SKB_CB(skb)->cscov, skb->len); 512 goto drop; 513 } 514 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 515 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 516 "too small, need min %d\n", 517 UDP_SKB_CB(skb)->cscov, up->pcrlen); 518 goto drop; 519 } 520 } 521 522 if (sk->sk_filter) { 523 if (udp_lib_checksum_complete(skb)) 524 goto drop; 525 } 526 527 if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) { 528 /* Note that an ENOMEM error is charged twice */ 529 if (rc == -ENOMEM) 530 UDP6_INC_STATS_BH(sock_net(sk), 531 UDP_MIB_RCVBUFERRORS, is_udplite); 532 goto drop_no_sk_drops_inc; 533 } 534 535 return 0; 536drop: 537 atomic_inc(&sk->sk_drops); 538drop_no_sk_drops_inc: 539 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 540 kfree_skb(skb); 541 return -1; 542} 543 544static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 545 __be16 loc_port, struct in6_addr *loc_addr, 546 __be16 rmt_port, struct in6_addr *rmt_addr, 547 int dif) 548{ 549 struct hlist_nulls_node *node; 550 struct sock *s = sk; 551 unsigned short num = ntohs(loc_port); 552 553 sk_nulls_for_each_from(s, node) { 554 struct inet_sock *inet = inet_sk(s); 555 556 if (!net_eq(sock_net(s), net)) 557 continue; 558 559 if (udp_sk(s)->udp_port_hash == num && 560 s->sk_family == PF_INET6) { 561 struct ipv6_pinfo *np = inet6_sk(s); 562 if (inet->inet_dport) { 563 if (inet->inet_dport != rmt_port) 564 continue; 565 } 566 if (!ipv6_addr_any(&np->daddr) && 567 !ipv6_addr_equal(&np->daddr, rmt_addr)) 568 continue; 569 570 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 571 continue; 572 573 if (!ipv6_addr_any(&np->rcv_saddr)) { 574 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 575 continue; 576 } 577 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 578 continue; 579 return s; 580 } 581 } 582 return NULL; 583} 584 585static void flush_stack(struct sock **stack, unsigned int count, 586 struct sk_buff *skb, unsigned int final) 587{ 588 unsigned int i; 589 struct sock *sk; 590 struct sk_buff *skb1; 591 592 for (i = 0; i < count; i++) { 593 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 594 595 sk = stack[i]; 596 if (skb1) { 597 if (sk_rcvqueues_full(sk, skb)) { 598 kfree_skb(skb1); 599 goto drop; 600 } 601 bh_lock_sock(sk); 602 if (!sock_owned_by_user(sk)) 603 udpv6_queue_rcv_skb(sk, skb1); 604 else if (sk_add_backlog(sk, skb1)) { 605 kfree_skb(skb1); 606 bh_unlock_sock(sk); 607 goto drop; 608 } 609 bh_unlock_sock(sk); 610 continue; 611 } 612drop: 613 atomic_inc(&sk->sk_drops); 614 UDP6_INC_STATS_BH(sock_net(sk), 615 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk)); 616 UDP6_INC_STATS_BH(sock_net(sk), 617 UDP_MIB_INERRORS, IS_UDPLITE(sk)); 618 } 619} 620/* 621 * Note: called only from the BH handler context, 622 * so we don't need to lock the hashes. 623 */ 624static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 625 struct in6_addr *saddr, struct in6_addr *daddr, 626 struct udp_table *udptable) 627{ 628 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 629 const struct udphdr *uh = udp_hdr(skb); 630 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 631 int dif; 632 unsigned int i, count = 0; 633 634 spin_lock(&hslot->lock); 635 sk = sk_nulls_head(&hslot->head); 636 dif = inet6_iif(skb); 637 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 638 while (sk) { 639 stack[count++] = sk; 640 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 641 uh->source, saddr, dif); 642 if (unlikely(count == ARRAY_SIZE(stack))) { 643 if (!sk) 644 break; 645 flush_stack(stack, count, skb, ~0); 646 count = 0; 647 } 648 } 649 /* 650 * before releasing the lock, we must take reference on sockets 651 */ 652 for (i = 0; i < count; i++) 653 sock_hold(stack[i]); 654 655 spin_unlock(&hslot->lock); 656 657 if (count) { 658 flush_stack(stack, count, skb, count - 1); 659 660 for (i = 0; i < count; i++) 661 sock_put(stack[i]); 662 } else { 663 kfree_skb(skb); 664 } 665 return 0; 666} 667 668static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 669 int proto) 670{ 671 int err; 672 673 UDP_SKB_CB(skb)->partial_cov = 0; 674 UDP_SKB_CB(skb)->cscov = skb->len; 675 676 if (proto == IPPROTO_UDPLITE) { 677 err = udplite_checksum_init(skb, uh); 678 if (err) 679 return err; 680 } 681 682 if (uh->check == 0) { 683 /* RFC 2460 section 8.1 says that we SHOULD log 684 this error. Well, it is reasonable. 685 */ 686 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 687 return 1; 688 } 689 if (skb->ip_summed == CHECKSUM_COMPLETE && 690 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 691 skb->len, proto, skb->csum)) 692 skb->ip_summed = CHECKSUM_UNNECESSARY; 693 694 if (!skb_csum_unnecessary(skb)) 695 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 696 &ipv6_hdr(skb)->daddr, 697 skb->len, proto, 0)); 698 699 return 0; 700} 701 702int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 703 int proto) 704{ 705 struct net *net = dev_net(skb->dev); 706 struct sock *sk; 707 struct udphdr *uh; 708 struct in6_addr *saddr, *daddr; 709 u32 ulen = 0; 710 711 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 712 goto discard; 713 714 saddr = &ipv6_hdr(skb)->saddr; 715 daddr = &ipv6_hdr(skb)->daddr; 716 uh = udp_hdr(skb); 717 718 ulen = ntohs(uh->len); 719 if (ulen > skb->len) 720 goto short_packet; 721 722 if (proto == IPPROTO_UDP) { 723 /* UDP validates ulen. */ 724 725 /* Check for jumbo payload */ 726 if (ulen == 0) 727 ulen = skb->len; 728 729 if (ulen < sizeof(*uh)) 730 goto short_packet; 731 732 if (ulen < skb->len) { 733 if (pskb_trim_rcsum(skb, ulen)) 734 goto short_packet; 735 saddr = &ipv6_hdr(skb)->saddr; 736 daddr = &ipv6_hdr(skb)->daddr; 737 uh = udp_hdr(skb); 738 } 739 } 740 741 if (udp6_csum_init(skb, uh, proto)) 742 goto discard; 743 744 /* 745 * Multicast receive code 746 */ 747 if (ipv6_addr_is_multicast(daddr)) 748 return __udp6_lib_mcast_deliver(net, skb, 749 saddr, daddr, udptable); 750 751 /* Unicast */ 752 753 /* 754 * check socket cache ... must talk to Alan about his plans 755 * for sock caches... i'll skip this for now. 756 */ 757 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 758 759 if (sk == NULL) { 760 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 761 goto discard; 762 763 if (udp_lib_checksum_complete(skb)) 764 goto discard; 765 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, 766 proto == IPPROTO_UDPLITE); 767 768 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); 769 770 kfree_skb(skb); 771 return 0; 772 } 773 774 /* deliver */ 775 776 if (sk_rcvqueues_full(sk, skb)) { 777 sock_put(sk); 778 goto discard; 779 } 780 bh_lock_sock(sk); 781 if (!sock_owned_by_user(sk)) 782 udpv6_queue_rcv_skb(sk, skb); 783 else if (sk_add_backlog(sk, skb)) { 784 atomic_inc(&sk->sk_drops); 785 bh_unlock_sock(sk); 786 sock_put(sk); 787 goto discard; 788 } 789 bh_unlock_sock(sk); 790 sock_put(sk); 791 return 0; 792 793short_packet: 794 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", 795 proto == IPPROTO_UDPLITE ? "-Lite" : "", 796 saddr, 797 ntohs(uh->source), 798 ulen, 799 skb->len, 800 daddr, 801 ntohs(uh->dest)); 802 803discard: 804 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 805 kfree_skb(skb); 806 return 0; 807} 808 809static __inline__ int udpv6_rcv(struct sk_buff *skb) 810{ 811 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 812} 813 814/* 815 * Throw away all pending data and cancel the corking. Socket is locked. 816 */ 817static void udp_v6_flush_pending_frames(struct sock *sk) 818{ 819 struct udp_sock *up = udp_sk(sk); 820 821 if (up->pending == AF_INET) 822 udp_flush_pending_frames(sk); 823 else if (up->pending) { 824 up->len = 0; 825 up->pending = 0; 826 ip6_flush_pending_frames(sk); 827 } 828} 829 830/** 831 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 832 * @sk: socket we are sending on 833 * @skb: sk_buff containing the filled-in UDP header 834 * (checksum field must be zeroed out) 835 */ 836static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 837 const struct in6_addr *saddr, 838 const struct in6_addr *daddr, int len) 839{ 840 unsigned int offset; 841 struct udphdr *uh = udp_hdr(skb); 842 __wsum csum = 0; 843 844 if (skb_queue_len(&sk->sk_write_queue) == 1) { 845 /* Only one fragment on the socket. */ 846 skb->csum_start = skb_transport_header(skb) - skb->head; 847 skb->csum_offset = offsetof(struct udphdr, check); 848 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 849 } else { 850 /* 851 * HW-checksum won't work as there are two or more 852 * fragments on the socket so that all csums of sk_buffs 853 * should be together 854 */ 855 offset = skb_transport_offset(skb); 856 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 857 858 skb->ip_summed = CHECKSUM_NONE; 859 860 skb_queue_walk(&sk->sk_write_queue, skb) { 861 csum = csum_add(csum, skb->csum); 862 } 863 864 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 865 csum); 866 if (uh->check == 0) 867 uh->check = CSUM_MANGLED_0; 868 } 869} 870 871/* 872 * Sending 873 */ 874 875static int udp_v6_push_pending_frames(struct sock *sk) 876{ 877 struct sk_buff *skb; 878 struct udphdr *uh; 879 struct udp_sock *up = udp_sk(sk); 880 struct inet_sock *inet = inet_sk(sk); 881 struct flowi *fl = &inet->cork.fl; 882 int err = 0; 883 int is_udplite = IS_UDPLITE(sk); 884 __wsum csum = 0; 885 886 /* Grab the skbuff where UDP header space exists. */ 887 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 888 goto out; 889 890 /* 891 * Create a UDP header 892 */ 893 uh = udp_hdr(skb); 894 uh->source = fl->fl_ip_sport; 895 uh->dest = fl->fl_ip_dport; 896 uh->len = htons(up->len); 897 uh->check = 0; 898 899 if (is_udplite) 900 csum = udplite_csum_outgoing(sk, skb); 901 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 902 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst, 903 up->len); 904 goto send; 905 } else 906 csum = udp_csum_outgoing(sk, skb); 907 908 /* add protocol-dependent pseudo-header */ 909 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 910 up->len, fl->proto, csum ); 911 if (uh->check == 0) 912 uh->check = CSUM_MANGLED_0; 913 914send: 915 err = ip6_push_pending_frames(sk); 916 if (err) { 917 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 918 UDP6_INC_STATS_USER(sock_net(sk), 919 UDP_MIB_SNDBUFERRORS, is_udplite); 920 err = 0; 921 } 922 } else 923 UDP6_INC_STATS_USER(sock_net(sk), 924 UDP_MIB_OUTDATAGRAMS, is_udplite); 925out: 926 up->len = 0; 927 up->pending = 0; 928 return err; 929} 930 931int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 932 struct msghdr *msg, size_t len) 933{ 934 struct ipv6_txoptions opt_space; 935 struct udp_sock *up = udp_sk(sk); 936 struct inet_sock *inet = inet_sk(sk); 937 struct ipv6_pinfo *np = inet6_sk(sk); 938 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 939 struct in6_addr *daddr, *final_p, final; 940 struct ipv6_txoptions *opt = NULL; 941 struct ip6_flowlabel *flowlabel = NULL; 942 struct flowi fl; 943 struct dst_entry *dst; 944 int addr_len = msg->msg_namelen; 945 int ulen = len; 946 int hlimit = -1; 947 int tclass = -1; 948 int dontfrag = -1; 949 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 950 int err; 951 int connected = 0; 952 int is_udplite = IS_UDPLITE(sk); 953 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 954 955 /* destination address check */ 956 if (sin6) { 957 if (addr_len < offsetof(struct sockaddr, sa_data)) 958 return -EINVAL; 959 960 switch (sin6->sin6_family) { 961 case AF_INET6: 962 if (addr_len < SIN6_LEN_RFC2133) 963 return -EINVAL; 964 daddr = &sin6->sin6_addr; 965 break; 966 case AF_INET: 967 goto do_udp_sendmsg; 968 case AF_UNSPEC: 969 msg->msg_name = sin6 = NULL; 970 msg->msg_namelen = addr_len = 0; 971 daddr = NULL; 972 break; 973 default: 974 return -EINVAL; 975 } 976 } else if (!up->pending) { 977 if (sk->sk_state != TCP_ESTABLISHED) 978 return -EDESTADDRREQ; 979 daddr = &np->daddr; 980 } else 981 daddr = NULL; 982 983 if (daddr) { 984 if (ipv6_addr_v4mapped(daddr)) { 985 struct sockaddr_in sin; 986 sin.sin_family = AF_INET; 987 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 988 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 989 msg->msg_name = &sin; 990 msg->msg_namelen = sizeof(sin); 991do_udp_sendmsg: 992 if (__ipv6_only_sock(sk)) 993 return -ENETUNREACH; 994 return udp_sendmsg(iocb, sk, msg, len); 995 } 996 } 997 998 if (up->pending == AF_INET) 999 return udp_sendmsg(iocb, sk, msg, len); 1000 1001 /* Rough check on arithmetic overflow, 1002 better check is made in ip6_append_data(). 1003 */ 1004 if (len > INT_MAX - sizeof(struct udphdr)) 1005 return -EMSGSIZE; 1006 1007 if (up->pending) { 1008 /* 1009 * There are pending frames. 1010 * The socket lock must be held while it's corked. 1011 */ 1012 lock_sock(sk); 1013 if (likely(up->pending)) { 1014 if (unlikely(up->pending != AF_INET6)) { 1015 release_sock(sk); 1016 return -EAFNOSUPPORT; 1017 } 1018 dst = NULL; 1019 goto do_append_data; 1020 } 1021 release_sock(sk); 1022 } 1023 ulen += sizeof(struct udphdr); 1024 1025 memset(&fl, 0, sizeof(fl)); 1026 1027 if (sin6) { 1028 if (sin6->sin6_port == 0) 1029 return -EINVAL; 1030 1031 fl.fl_ip_dport = sin6->sin6_port; 1032 daddr = &sin6->sin6_addr; 1033 1034 if (np->sndflow) { 1035 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1036 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 1037 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 1038 if (flowlabel == NULL) 1039 return -EINVAL; 1040 daddr = &flowlabel->dst; 1041 } 1042 } 1043 1044 /* 1045 * Otherwise it will be difficult to maintain 1046 * sk->sk_dst_cache. 1047 */ 1048 if (sk->sk_state == TCP_ESTABLISHED && 1049 ipv6_addr_equal(daddr, &np->daddr)) 1050 daddr = &np->daddr; 1051 1052 if (addr_len >= sizeof(struct sockaddr_in6) && 1053 sin6->sin6_scope_id && 1054 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 1055 fl.oif = sin6->sin6_scope_id; 1056 } else { 1057 if (sk->sk_state != TCP_ESTABLISHED) 1058 return -EDESTADDRREQ; 1059 1060 fl.fl_ip_dport = inet->inet_dport; 1061 daddr = &np->daddr; 1062 fl.fl6_flowlabel = np->flow_label; 1063 connected = 1; 1064 } 1065 1066 if (!fl.oif) 1067 fl.oif = sk->sk_bound_dev_if; 1068 1069 if (!fl.oif) 1070 fl.oif = np->sticky_pktinfo.ipi6_ifindex; 1071 1072 fl.mark = sk->sk_mark; 1073 1074 if (msg->msg_controllen) { 1075 opt = &opt_space; 1076 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1077 opt->tot_len = sizeof(*opt); 1078 1079 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, 1080 &tclass, &dontfrag); 1081 if (err < 0) { 1082 fl6_sock_release(flowlabel); 1083 return err; 1084 } 1085 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1086 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 1087 if (flowlabel == NULL) 1088 return -EINVAL; 1089 } 1090 if (!(opt->opt_nflen|opt->opt_flen)) 1091 opt = NULL; 1092 connected = 0; 1093 } 1094 if (opt == NULL) 1095 opt = np->opt; 1096 if (flowlabel) 1097 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1098 opt = ipv6_fixup_options(&opt_space, opt); 1099 1100 fl.proto = sk->sk_protocol; 1101 if (!ipv6_addr_any(daddr)) 1102 ipv6_addr_copy(&fl.fl6_dst, daddr); 1103 else 1104 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1105 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 1106 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 1107 fl.fl_ip_sport = inet->inet_sport; 1108 1109 final_p = fl6_update_dst(&fl, opt, &final); 1110 if (final_p) 1111 connected = 0; 1112 1113 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 1114 fl.oif = np->mcast_oif; 1115 connected = 0; 1116 } 1117 1118 security_sk_classify_flow(sk, &fl); 1119 1120 err = ip6_sk_dst_lookup(sk, &dst, &fl); 1121 if (err) 1122 goto out; 1123 if (final_p) 1124 ipv6_addr_copy(&fl.fl6_dst, final_p); 1125 1126 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 1127 if (err < 0) { 1128 if (err == -EREMOTE) 1129 err = ip6_dst_blackhole(sk, &dst, &fl); 1130 if (err < 0) 1131 goto out; 1132 } 1133 1134 if (hlimit < 0) { 1135 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 1136 hlimit = np->mcast_hops; 1137 else 1138 hlimit = np->hop_limit; 1139 if (hlimit < 0) 1140 hlimit = ip6_dst_hoplimit(dst); 1141 } 1142 1143 if (tclass < 0) 1144 tclass = np->tclass; 1145 1146 if (dontfrag < 0) 1147 dontfrag = np->dontfrag; 1148 1149 if (msg->msg_flags&MSG_CONFIRM) 1150 goto do_confirm; 1151back_from_confirm: 1152 1153 lock_sock(sk); 1154 if (unlikely(up->pending)) { 1155 /* The socket is already corked while preparing it. */ 1156 /* ... which is an evident application bug. --ANK */ 1157 release_sock(sk); 1158 1159 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1160 err = -EINVAL; 1161 goto out; 1162 } 1163 1164 up->pending = AF_INET6; 1165 1166do_append_data: 1167 up->len += ulen; 1168 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1169 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1170 sizeof(struct udphdr), hlimit, tclass, opt, &fl, 1171 (struct rt6_info*)dst, 1172 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); 1173 if (err) 1174 udp_v6_flush_pending_frames(sk); 1175 else if (!corkreq) 1176 err = udp_v6_push_pending_frames(sk); 1177 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1178 up->pending = 0; 1179 1180 if (dst) { 1181 if (connected) { 1182 ip6_dst_store(sk, dst, 1183 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 1184 &np->daddr : NULL, 1185#ifdef CONFIG_IPV6_SUBTREES 1186 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 1187 &np->saddr : 1188#endif 1189 NULL); 1190 } else { 1191 dst_release(dst); 1192 } 1193 dst = NULL; 1194 } 1195 1196 if (err > 0) 1197 err = np->recverr ? net_xmit_errno(err) : 0; 1198 release_sock(sk); 1199out: 1200 dst_release(dst); 1201 fl6_sock_release(flowlabel); 1202 if (!err) 1203 return len; 1204 /* 1205 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1206 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1207 * we don't have a good statistic (IpOutDiscards but it can be too many 1208 * things). We could add another new stat but at least for now that 1209 * seems like overkill. 1210 */ 1211 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1212 UDP6_INC_STATS_USER(sock_net(sk), 1213 UDP_MIB_SNDBUFERRORS, is_udplite); 1214 } 1215 return err; 1216 1217do_confirm: 1218 dst_confirm(dst); 1219 if (!(msg->msg_flags&MSG_PROBE) || len) 1220 goto back_from_confirm; 1221 err = 0; 1222 goto out; 1223} 1224 1225void udpv6_destroy_sock(struct sock *sk) 1226{ 1227 lock_sock(sk); 1228 udp_v6_flush_pending_frames(sk); 1229 release_sock(sk); 1230 1231 inet6_destroy_sock(sk); 1232} 1233 1234/* 1235 * Socket option code for UDP 1236 */ 1237int udpv6_setsockopt(struct sock *sk, int level, int optname, 1238 char __user *optval, unsigned int optlen) 1239{ 1240 if (level == SOL_UDP || level == SOL_UDPLITE) 1241 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1242 udp_v6_push_pending_frames); 1243 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1244} 1245 1246#ifdef CONFIG_COMPAT 1247int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1248 char __user *optval, unsigned int optlen) 1249{ 1250 if (level == SOL_UDP || level == SOL_UDPLITE) 1251 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1252 udp_v6_push_pending_frames); 1253 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1254} 1255#endif 1256 1257int udpv6_getsockopt(struct sock *sk, int level, int optname, 1258 char __user *optval, int __user *optlen) 1259{ 1260 if (level == SOL_UDP || level == SOL_UDPLITE) 1261 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1262 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1263} 1264 1265#ifdef CONFIG_COMPAT 1266int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1267 char __user *optval, int __user *optlen) 1268{ 1269 if (level == SOL_UDP || level == SOL_UDPLITE) 1270 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1271 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1272} 1273#endif 1274 1275static int udp6_ufo_send_check(struct sk_buff *skb) 1276{ 1277 struct ipv6hdr *ipv6h; 1278 struct udphdr *uh; 1279 1280 if (!pskb_may_pull(skb, sizeof(*uh))) 1281 return -EINVAL; 1282 1283 ipv6h = ipv6_hdr(skb); 1284 uh = udp_hdr(skb); 1285 1286 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, 1287 IPPROTO_UDP, 0); 1288 skb->csum_start = skb_transport_header(skb) - skb->head; 1289 skb->csum_offset = offsetof(struct udphdr, check); 1290 skb->ip_summed = CHECKSUM_PARTIAL; 1291 return 0; 1292} 1293 1294static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features) 1295{ 1296 struct sk_buff *segs = ERR_PTR(-EINVAL); 1297 unsigned int mss; 1298 unsigned int unfrag_ip6hlen, unfrag_len; 1299 struct frag_hdr *fptr; 1300 u8 *mac_start, *prevhdr; 1301 u8 nexthdr; 1302 u8 frag_hdr_sz = sizeof(struct frag_hdr); 1303 int offset; 1304 __wsum csum; 1305 1306 mss = skb_shinfo(skb)->gso_size; 1307 if (unlikely(skb->len <= mss)) 1308 goto out; 1309 1310 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { 1311 /* Packet is from an untrusted source, reset gso_segs. */ 1312 int type = skb_shinfo(skb)->gso_type; 1313 1314 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || 1315 !(type & (SKB_GSO_UDP)))) 1316 goto out; 1317 1318 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); 1319 1320 segs = NULL; 1321 goto out; 1322 } 1323 1324 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot 1325 * do checksum of UDP packets sent as multiple IP fragments. 1326 */ 1327 offset = skb->csum_start - skb_headroom(skb); 1328 csum = skb_checksum(skb, offset, skb->len- offset, 0); 1329 offset += skb->csum_offset; 1330 *(__sum16 *)(skb->data + offset) = csum_fold(csum); 1331 skb->ip_summed = CHECKSUM_NONE; 1332 1333 /* Check if there is enough headroom to insert fragment header. */ 1334 if ((skb_headroom(skb) < frag_hdr_sz) && 1335 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) 1336 goto out; 1337 1338 /* Find the unfragmentable header and shift it left by frag_hdr_sz 1339 * bytes to insert fragment header. 1340 */ 1341 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 1342 nexthdr = *prevhdr; 1343 *prevhdr = NEXTHDR_FRAGMENT; 1344 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + 1345 unfrag_ip6hlen; 1346 mac_start = skb_mac_header(skb); 1347 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); 1348 1349 skb->mac_header -= frag_hdr_sz; 1350 skb->network_header -= frag_hdr_sz; 1351 1352 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); 1353 fptr->nexthdr = nexthdr; 1354 fptr->reserved = 0; 1355 ipv6_select_ident(fptr); 1356 1357 /* Fragment the skb. ipv6 header and the remaining fields of the 1358 * fragment header are updated in ipv6_gso_segment() 1359 */ 1360 segs = skb_segment(skb, features); 1361 1362out: 1363 return segs; 1364} 1365 1366static const struct inet6_protocol udpv6_protocol = { 1367 .handler = udpv6_rcv, 1368 .err_handler = udpv6_err, 1369 .gso_send_check = udp6_ufo_send_check, 1370 .gso_segment = udp6_ufo_fragment, 1371 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1372}; 1373 1374/* ------------------------------------------------------------------------ */ 1375#ifdef CONFIG_PROC_FS 1376 1377static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1378{ 1379 struct inet_sock *inet = inet_sk(sp); 1380 struct ipv6_pinfo *np = inet6_sk(sp); 1381 struct in6_addr *dest, *src; 1382 __u16 destp, srcp; 1383 1384 dest = &np->daddr; 1385 src = &np->rcv_saddr; 1386 destp = ntohs(inet->inet_dport); 1387 srcp = ntohs(inet->inet_sport); 1388 seq_printf(seq, 1389 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1390 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1391 bucket, 1392 src->s6_addr32[0], src->s6_addr32[1], 1393 src->s6_addr32[2], src->s6_addr32[3], srcp, 1394 dest->s6_addr32[0], dest->s6_addr32[1], 1395 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1396 sp->sk_state, 1397 sk_wmem_alloc_get(sp), 1398 sk_rmem_alloc_get(sp), 1399 0, 0L, 0, 1400 sock_i_uid(sp), 0, 1401 sock_i_ino(sp), 1402 atomic_read(&sp->sk_refcnt), sp, 1403 atomic_read(&sp->sk_drops)); 1404} 1405 1406int udp6_seq_show(struct seq_file *seq, void *v) 1407{ 1408 if (v == SEQ_START_TOKEN) 1409 seq_printf(seq, 1410 " sl " 1411 "local_address " 1412 "remote_address " 1413 "st tx_queue rx_queue tr tm->when retrnsmt" 1414 " uid timeout inode ref pointer drops\n"); 1415 else 1416 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1417 return 0; 1418} 1419 1420static struct udp_seq_afinfo udp6_seq_afinfo = { 1421 .name = "udp6", 1422 .family = AF_INET6, 1423 .udp_table = &udp_table, 1424 .seq_fops = { 1425 .owner = THIS_MODULE, 1426 }, 1427 .seq_ops = { 1428 .show = udp6_seq_show, 1429 }, 1430}; 1431 1432int __net_init udp6_proc_init(struct net *net) 1433{ 1434 return udp_proc_register(net, &udp6_seq_afinfo); 1435} 1436 1437void udp6_proc_exit(struct net *net) { 1438 udp_proc_unregister(net, &udp6_seq_afinfo); 1439} 1440#endif /* CONFIG_PROC_FS */ 1441 1442/* ------------------------------------------------------------------------ */ 1443 1444struct proto udpv6_prot = { 1445 .name = "UDPv6", 1446 .owner = THIS_MODULE, 1447 .close = udp_lib_close, 1448 .connect = ip6_datagram_connect, 1449 .disconnect = udp_disconnect, 1450 .ioctl = udp_ioctl, 1451 .destroy = udpv6_destroy_sock, 1452 .setsockopt = udpv6_setsockopt, 1453 .getsockopt = udpv6_getsockopt, 1454 .sendmsg = udpv6_sendmsg, 1455 .recvmsg = udpv6_recvmsg, 1456 .backlog_rcv = udpv6_queue_rcv_skb, 1457 .hash = udp_lib_hash, 1458 .unhash = udp_lib_unhash, 1459 .rehash = udp_v6_rehash, 1460 .get_port = udp_v6_get_port, 1461 .memory_allocated = &udp_memory_allocated, 1462 .sysctl_mem = sysctl_udp_mem, 1463 .sysctl_wmem = &sysctl_udp_wmem_min, 1464 .sysctl_rmem = &sysctl_udp_rmem_min, 1465 .obj_size = sizeof(struct udp6_sock), 1466 .slab_flags = SLAB_DESTROY_BY_RCU, 1467 .h.udp_table = &udp_table, 1468#ifdef CONFIG_COMPAT 1469 .compat_setsockopt = compat_udpv6_setsockopt, 1470 .compat_getsockopt = compat_udpv6_getsockopt, 1471#endif 1472}; 1473 1474static struct inet_protosw udpv6_protosw = { 1475 .type = SOCK_DGRAM, 1476 .protocol = IPPROTO_UDP, 1477 .prot = &udpv6_prot, 1478 .ops = &inet6_dgram_ops, 1479 .no_check = UDP_CSUM_DEFAULT, 1480 .flags = INET_PROTOSW_PERMANENT, 1481}; 1482 1483 1484int __init udpv6_init(void) 1485{ 1486 int ret; 1487 1488 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1489 if (ret) 1490 goto out; 1491 1492 ret = inet6_register_protosw(&udpv6_protosw); 1493 if (ret) 1494 goto out_udpv6_protocol; 1495out: 1496 return ret; 1497 1498out_udpv6_protocol: 1499 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1500 goto out; 1501} 1502 1503void udpv6_exit(void) 1504{ 1505 inet6_unregister_protosw(&udpv6_protosw); 1506 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1507} 1508