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 <asm/uaccess.h> 38 39 #include <net/ndisc.h> 40 #include <net/protocol.h> 41 #include <net/transp_v6.h> 42 #include <net/ip6_route.h> 43 #include <net/raw.h> 44 #include <net/tcp_states.h> 45 #include <net/ip6_checksum.h> 46 #include <net/xfrm.h> 47 48 #include <linux/proc_fs.h> 49 #include <linux/seq_file.h> 50 #include "udp_impl.h" 51 52 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) 53 { 54 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; 55 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); 56 __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr; 57 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 58 int sk_ipv6only = ipv6_only_sock(sk); 59 int sk2_ipv6only = inet_v6_ipv6only(sk2); 60 int addr_type = ipv6_addr_type(sk_rcv_saddr6); 61 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; 62 63 /* if both are mapped, treat as IPv4 */ 64 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) 65 return (!sk2_ipv6only && 66 (!sk1_rcv_saddr || !sk2_rcv_saddr || 67 sk1_rcv_saddr == sk2_rcv_saddr)); 68 69 if (addr_type2 == IPV6_ADDR_ANY && 70 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) 71 return 1; 72 73 if (addr_type == IPV6_ADDR_ANY && 74 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) 75 return 1; 76 77 if (sk2_rcv_saddr6 && 78 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) 79 return 1; 80 81 return 0; 82 } 83 84 static unsigned int udp6_portaddr_hash(struct net *net, 85 const struct in6_addr *addr6, 86 unsigned int port) 87 { 88 unsigned int hash, mix = net_hash_mix(net); 89 90 if (ipv6_addr_any(addr6)) 91 hash = jhash_1word(0, mix); 92 else if (ipv6_addr_v4mapped(addr6)) 93 hash = jhash_1word(addr6->s6_addr32[3], mix); 94 else 95 hash = jhash2(addr6->s6_addr32, 4, mix); 96 97 return hash ^ port; 98 } 99 100 101 int udp_v6_get_port(struct sock *sk, unsigned short snum) 102 { 103 unsigned int hash2_nulladdr = 104 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); 105 unsigned int hash2_partial = 106 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); 107 108 /* precompute partial secondary hash */ 109 udp_sk(sk)->udp_portaddr_hash = hash2_partial; 110 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); 111 } 112 113 static inline int compute_score(struct sock *sk, struct net *net, 114 unsigned short hnum, 115 struct in6_addr *saddr, __be16 sport, 116 struct in6_addr *daddr, __be16 dport, 117 int dif) 118 { 119 int score = -1; 120 121 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 122 sk->sk_family == PF_INET6) { 123 struct ipv6_pinfo *np = inet6_sk(sk); 124 struct inet_sock *inet = inet_sk(sk); 125 126 score = 0; 127 if (inet->inet_dport) { 128 if (inet->inet_dport != sport) 129 return -1; 130 score++; 131 } 132 if (!ipv6_addr_any(&np->rcv_saddr)) { 133 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 134 return -1; 135 score++; 136 } 137 if (!ipv6_addr_any(&np->daddr)) { 138 if (!ipv6_addr_equal(&np->daddr, saddr)) 139 return -1; 140 score++; 141 } 142 if (sk->sk_bound_dev_if) { 143 if (sk->sk_bound_dev_if != dif) 144 return -1; 145 score++; 146 } 147 } 148 return score; 149 } 150 151 #define SCORE2_MAX (1 + 1 + 1) 152 static inline int compute_score2(struct sock *sk, struct net *net, 153 const struct in6_addr *saddr, __be16 sport, 154 const struct in6_addr *daddr, unsigned short hnum, 155 int dif) 156 { 157 int score = -1; 158 159 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && 160 sk->sk_family == PF_INET6) { 161 struct ipv6_pinfo *np = inet6_sk(sk); 162 struct inet_sock *inet = inet_sk(sk); 163 164 if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) 165 return -1; 166 score = 0; 167 if (inet->inet_dport) { 168 if (inet->inet_dport != sport) 169 return -1; 170 score++; 171 } 172 if (!ipv6_addr_any(&np->daddr)) { 173 if (!ipv6_addr_equal(&np->daddr, saddr)) 174 return -1; 175 score++; 176 } 177 if (sk->sk_bound_dev_if) { 178 if (sk->sk_bound_dev_if != dif) 179 return -1; 180 score++; 181 } 182 } 183 return score; 184 } 185 186 187 /* called with read_rcu_lock() */ 188 static struct sock *udp6_lib_lookup2(struct net *net, 189 const struct in6_addr *saddr, __be16 sport, 190 const struct in6_addr *daddr, unsigned int hnum, int dif, 191 struct udp_hslot *hslot2, unsigned int slot2) 192 { 193 struct sock *sk, *result; 194 struct hlist_nulls_node *node; 195 int score, badness; 196 197 begin: 198 result = NULL; 199 badness = -1; 200 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { 201 score = compute_score2(sk, net, saddr, sport, 202 daddr, hnum, dif); 203 if (score > badness) { 204 result = sk; 205 badness = score; 206 if (score == SCORE2_MAX) 207 goto exact_match; 208 } 209 } 210 /* 211 * if the nulls value we got at the end of this lookup is 212 * not the expected one, we must restart lookup. 213 * We probably met an item that was moved to another chain. 214 */ 215 if (get_nulls_value(node) != slot2) 216 goto begin; 217 218 if (result) { 219 exact_match: 220 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) 221 result = NULL; 222 else if (unlikely(compute_score2(result, net, saddr, sport, 223 daddr, hnum, dif) < badness)) { 224 sock_put(result); 225 goto begin; 226 } 227 } 228 return result; 229 } 230 231 static struct sock *__udp6_lib_lookup(struct net *net, 232 struct in6_addr *saddr, __be16 sport, 233 struct in6_addr *daddr, __be16 dport, 234 int dif, struct udp_table *udptable) 235 { 236 struct sock *sk, *result; 237 struct hlist_nulls_node *node; 238 unsigned short hnum = ntohs(dport); 239 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); 240 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; 241 int score, badness; 242 243 rcu_read_lock(); 244 if (hslot->count > 10) { 245 hash2 = udp6_portaddr_hash(net, daddr, hnum); 246 slot2 = hash2 & udptable->mask; 247 hslot2 = &udptable->hash2[slot2]; 248 if (hslot->count < hslot2->count) 249 goto begin; 250 251 result = udp6_lib_lookup2(net, saddr, sport, 252 daddr, hnum, dif, 253 hslot2, slot2); 254 if (!result) { 255 hash2 = udp6_portaddr_hash(net, &in6addr_any, 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, &in6addr_any, sport, 262 daddr, hnum, dif, 263 hslot2, slot2); 264 } 265 rcu_read_unlock(); 266 return result; 267 } 268 begin: 269 result = NULL; 270 badness = -1; 271 sk_nulls_for_each_rcu(sk, node, &hslot->head) { 272 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); 273 if (score > badness) { 274 result = sk; 275 badness = score; 276 } 277 } 278 /* 279 * if the nulls value we got at the end of this lookup is 280 * not the expected one, we must restart lookup. 281 * We probably met an item that was moved to another chain. 282 */ 283 if (get_nulls_value(node) != slot) 284 goto begin; 285 286 if (result) { 287 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) 288 result = NULL; 289 else if (unlikely(compute_score(result, net, hnum, saddr, sport, 290 daddr, dport, dif) < badness)) { 291 sock_put(result); 292 goto begin; 293 } 294 } 295 rcu_read_unlock(); 296 return result; 297 } 298 299 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, 300 __be16 sport, __be16 dport, 301 struct udp_table *udptable) 302 { 303 struct sock *sk; 304 struct ipv6hdr *iph = ipv6_hdr(skb); 305 306 if (unlikely(sk = skb_steal_sock(skb))) 307 return sk; 308 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, 309 &iph->daddr, dport, inet6_iif(skb), 310 udptable); 311 } 312 313 /* 314 * This should be easy, if there is something there we 315 * return it, otherwise we block. 316 */ 317 318 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, 319 struct msghdr *msg, size_t len, 320 int noblock, int flags, int *addr_len) 321 { 322 struct ipv6_pinfo *np = inet6_sk(sk); 323 struct inet_sock *inet = inet_sk(sk); 324 struct sk_buff *skb; 325 unsigned int ulen, copied; 326 int peeked; 327 int err; 328 int is_udplite = IS_UDPLITE(sk); 329 int is_udp4; 330 331 if (addr_len) 332 *addr_len=sizeof(struct sockaddr_in6); 333 334 if (flags & MSG_ERRQUEUE) 335 return ipv6_recv_error(sk, msg, len); 336 337 try_again: 338 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), 339 &peeked, &err); 340 if (!skb) 341 goto out; 342 343 ulen = skb->len - sizeof(struct udphdr); 344 copied = len; 345 if (copied > ulen) 346 copied = ulen; 347 else if (copied < ulen) 348 msg->msg_flags |= MSG_TRUNC; 349 350 is_udp4 = (skb->protocol == htons(ETH_P_IP)); 351 352 /* 353 * If checksum is needed at all, try to do it while copying the 354 * data. If the data is truncated, or if we only want a partial 355 * coverage checksum (UDP-Lite), do it before the copy. 356 */ 357 358 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { 359 if (udp_lib_checksum_complete(skb)) 360 goto csum_copy_err; 361 } 362 363 if (skb_csum_unnecessary(skb)) 364 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), 365 msg->msg_iov, copied ); 366 else { 367 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); 368 if (err == -EINVAL) 369 goto csum_copy_err; 370 } 371 if (err) 372 goto out_free; 373 374 if (!peeked) { 375 if (is_udp4) 376 UDP_INC_STATS_USER(sock_net(sk), 377 UDP_MIB_INDATAGRAMS, is_udplite); 378 else 379 UDP6_INC_STATS_USER(sock_net(sk), 380 UDP_MIB_INDATAGRAMS, is_udplite); 381 } 382 383 sock_recv_ts_and_drops(msg, sk, skb); 384 385 /* Copy the address. */ 386 if (msg->msg_name) { 387 struct sockaddr_in6 *sin6; 388 389 sin6 = (struct sockaddr_in6 *) msg->msg_name; 390 sin6->sin6_family = AF_INET6; 391 sin6->sin6_port = udp_hdr(skb)->source; 392 sin6->sin6_flowinfo = 0; 393 sin6->sin6_scope_id = 0; 394 395 if (is_udp4) 396 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 397 &sin6->sin6_addr); 398 else { 399 ipv6_addr_copy(&sin6->sin6_addr, 400 &ipv6_hdr(skb)->saddr); 401 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 402 sin6->sin6_scope_id = IP6CB(skb)->iif; 403 } 404 405 } 406 if (is_udp4) { 407 if (inet->cmsg_flags) 408 ip_cmsg_recv(msg, skb); 409 } else { 410 if (np->rxopt.all) 411 datagram_recv_ctl(sk, msg, skb); 412 } 413 414 err = copied; 415 if (flags & MSG_TRUNC) 416 err = ulen; 417 418 out_free: 419 skb_free_datagram_locked(sk, skb); 420 out: 421 return err; 422 423 csum_copy_err: 424 lock_sock(sk); 425 if (!skb_kill_datagram(sk, skb, flags)) { 426 if (is_udp4) 427 UDP_INC_STATS_USER(sock_net(sk), 428 UDP_MIB_INERRORS, is_udplite); 429 else 430 UDP6_INC_STATS_USER(sock_net(sk), 431 UDP_MIB_INERRORS, is_udplite); 432 } 433 release_sock(sk); 434 435 if (flags & MSG_DONTWAIT) 436 return -EAGAIN; 437 goto try_again; 438 } 439 440 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 441 u8 type, u8 code, int offset, __be32 info, 442 struct udp_table *udptable) 443 { 444 struct ipv6_pinfo *np; 445 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; 446 struct in6_addr *saddr = &hdr->saddr; 447 struct in6_addr *daddr = &hdr->daddr; 448 struct udphdr *uh = (struct udphdr*)(skb->data+offset); 449 struct sock *sk; 450 int err; 451 452 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, 453 saddr, uh->source, inet6_iif(skb), udptable); 454 if (sk == NULL) 455 return; 456 457 np = inet6_sk(sk); 458 459 if (!icmpv6_err_convert(type, code, &err) && !np->recverr) 460 goto out; 461 462 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) 463 goto out; 464 465 if (np->recverr) 466 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); 467 468 sk->sk_err = err; 469 sk->sk_error_report(sk); 470 out: 471 sock_put(sk); 472 } 473 474 static __inline__ void udpv6_err(struct sk_buff *skb, 475 struct inet6_skb_parm *opt, u8 type, 476 u8 code, int offset, __be32 info ) 477 { 478 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); 479 } 480 481 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) 482 { 483 struct udp_sock *up = udp_sk(sk); 484 int rc; 485 int is_udplite = IS_UDPLITE(sk); 486 487 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) 488 goto drop; 489 490 /* 491 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). 492 */ 493 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { 494 495 if (up->pcrlen == 0) { /* full coverage was set */ 496 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" 497 " %d while full coverage %d requested\n", 498 UDP_SKB_CB(skb)->cscov, skb->len); 499 goto drop; 500 } 501 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { 502 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " 503 "too small, need min %d\n", 504 UDP_SKB_CB(skb)->cscov, up->pcrlen); 505 goto drop; 506 } 507 } 508 509 if (sk->sk_filter) { 510 if (udp_lib_checksum_complete(skb)) 511 goto drop; 512 } 513 514 if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) { 515 /* Note that an ENOMEM error is charged twice */ 516 if (rc == -ENOMEM) 517 UDP6_INC_STATS_BH(sock_net(sk), 518 UDP_MIB_RCVBUFERRORS, is_udplite); 519 goto drop_no_sk_drops_inc; 520 } 521 522 return 0; 523 drop: 524 atomic_inc(&sk->sk_drops); 525 drop_no_sk_drops_inc: 526 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); 527 kfree_skb(skb); 528 return -1; 529 } 530 531 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, 532 __be16 loc_port, struct in6_addr *loc_addr, 533 __be16 rmt_port, struct in6_addr *rmt_addr, 534 int dif) 535 { 536 struct hlist_nulls_node *node; 537 struct sock *s = sk; 538 unsigned short num = ntohs(loc_port); 539 540 sk_nulls_for_each_from(s, node) { 541 struct inet_sock *inet = inet_sk(s); 542 543 if (!net_eq(sock_net(s), net)) 544 continue; 545 546 if (udp_sk(s)->udp_port_hash == num && 547 s->sk_family == PF_INET6) { 548 struct ipv6_pinfo *np = inet6_sk(s); 549 if (inet->inet_dport) { 550 if (inet->inet_dport != rmt_port) 551 continue; 552 } 553 if (!ipv6_addr_any(&np->daddr) && 554 !ipv6_addr_equal(&np->daddr, rmt_addr)) 555 continue; 556 557 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) 558 continue; 559 560 if (!ipv6_addr_any(&np->rcv_saddr)) { 561 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 562 continue; 563 } 564 if (!inet6_mc_check(s, loc_addr, rmt_addr)) 565 continue; 566 return s; 567 } 568 } 569 return NULL; 570 } 571 572 static void flush_stack(struct sock **stack, unsigned int count, 573 struct sk_buff *skb, unsigned int final) 574 { 575 unsigned int i; 576 struct sock *sk; 577 struct sk_buff *skb1; 578 579 for (i = 0; i < count; i++) { 580 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); 581 582 sk = stack[i]; 583 if (skb1) { 584 bh_lock_sock(sk); 585 if (!sock_owned_by_user(sk)) 586 udpv6_queue_rcv_skb(sk, skb1); 587 else 588 sk_add_backlog(sk, skb1); 589 bh_unlock_sock(sk); 590 } else { 591 atomic_inc(&sk->sk_drops); 592 UDP6_INC_STATS_BH(sock_net(sk), 593 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk)); 594 UDP6_INC_STATS_BH(sock_net(sk), 595 UDP_MIB_INERRORS, IS_UDPLITE(sk)); 596 } 597 } 598 } 599 /* 600 * Note: called only from the BH handler context, 601 * so we don't need to lock the hashes. 602 */ 603 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, 604 struct in6_addr *saddr, struct in6_addr *daddr, 605 struct udp_table *udptable) 606 { 607 struct sock *sk, *stack[256 / sizeof(struct sock *)]; 608 const struct udphdr *uh = udp_hdr(skb); 609 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); 610 int dif; 611 unsigned int i, count = 0; 612 613 spin_lock(&hslot->lock); 614 sk = sk_nulls_head(&hslot->head); 615 dif = inet6_iif(skb); 616 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); 617 while (sk) { 618 stack[count++] = sk; 619 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, 620 uh->source, saddr, dif); 621 if (unlikely(count == ARRAY_SIZE(stack))) { 622 if (!sk) 623 break; 624 flush_stack(stack, count, skb, ~0); 625 count = 0; 626 } 627 } 628 /* 629 * before releasing the lock, we must take reference on sockets 630 */ 631 for (i = 0; i < count; i++) 632 sock_hold(stack[i]); 633 634 spin_unlock(&hslot->lock); 635 636 if (count) { 637 flush_stack(stack, count, skb, count - 1); 638 639 for (i = 0; i < count; i++) 640 sock_put(stack[i]); 641 } else { 642 kfree_skb(skb); 643 } 644 return 0; 645 } 646 647 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, 648 int proto) 649 { 650 int err; 651 652 UDP_SKB_CB(skb)->partial_cov = 0; 653 UDP_SKB_CB(skb)->cscov = skb->len; 654 655 if (proto == IPPROTO_UDPLITE) { 656 err = udplite_checksum_init(skb, uh); 657 if (err) 658 return err; 659 } 660 661 if (uh->check == 0) { 662 /* RFC 2460 section 8.1 says that we SHOULD log 663 this error. Well, it is reasonable. 664 */ 665 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); 666 return 1; 667 } 668 if (skb->ip_summed == CHECKSUM_COMPLETE && 669 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 670 skb->len, proto, skb->csum)) 671 skb->ip_summed = CHECKSUM_UNNECESSARY; 672 673 if (!skb_csum_unnecessary(skb)) 674 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 675 &ipv6_hdr(skb)->daddr, 676 skb->len, proto, 0)); 677 678 return 0; 679 } 680 681 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, 682 int proto) 683 { 684 struct sock *sk; 685 struct udphdr *uh; 686 struct net_device *dev = skb->dev; 687 struct in6_addr *saddr, *daddr; 688 u32 ulen = 0; 689 struct net *net = dev_net(skb->dev); 690 691 if (!pskb_may_pull(skb, sizeof(struct udphdr))) 692 goto short_packet; 693 694 saddr = &ipv6_hdr(skb)->saddr; 695 daddr = &ipv6_hdr(skb)->daddr; 696 uh = udp_hdr(skb); 697 698 ulen = ntohs(uh->len); 699 if (ulen > skb->len) 700 goto short_packet; 701 702 if (proto == IPPROTO_UDP) { 703 /* UDP validates ulen. */ 704 705 /* Check for jumbo payload */ 706 if (ulen == 0) 707 ulen = skb->len; 708 709 if (ulen < sizeof(*uh)) 710 goto short_packet; 711 712 if (ulen < skb->len) { 713 if (pskb_trim_rcsum(skb, ulen)) 714 goto short_packet; 715 saddr = &ipv6_hdr(skb)->saddr; 716 daddr = &ipv6_hdr(skb)->daddr; 717 uh = udp_hdr(skb); 718 } 719 } 720 721 if (udp6_csum_init(skb, uh, proto)) 722 goto discard; 723 724 /* 725 * Multicast receive code 726 */ 727 if (ipv6_addr_is_multicast(daddr)) 728 return __udp6_lib_mcast_deliver(net, skb, 729 saddr, daddr, udptable); 730 731 /* Unicast */ 732 733 /* 734 * check socket cache ... must talk to Alan about his plans 735 * for sock caches... i'll skip this for now. 736 */ 737 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); 738 739 if (sk == NULL) { 740 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 741 goto discard; 742 743 if (udp_lib_checksum_complete(skb)) 744 goto discard; 745 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, 746 proto == IPPROTO_UDPLITE); 747 748 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); 749 750 kfree_skb(skb); 751 return 0; 752 } 753 754 /* deliver */ 755 756 bh_lock_sock(sk); 757 if (!sock_owned_by_user(sk)) 758 udpv6_queue_rcv_skb(sk, skb); 759 else 760 sk_add_backlog(sk, skb); 761 bh_unlock_sock(sk); 762 sock_put(sk); 763 return 0; 764 765 short_packet: 766 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", 767 proto == IPPROTO_UDPLITE ? "-Lite" : "", 768 ulen, skb->len); 769 770 discard: 771 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); 772 kfree_skb(skb); 773 return 0; 774 } 775 776 static __inline__ int udpv6_rcv(struct sk_buff *skb) 777 { 778 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); 779 } 780 781 /* 782 * Throw away all pending data and cancel the corking. Socket is locked. 783 */ 784 static void udp_v6_flush_pending_frames(struct sock *sk) 785 { 786 struct udp_sock *up = udp_sk(sk); 787 788 if (up->pending == AF_INET) 789 udp_flush_pending_frames(sk); 790 else if (up->pending) { 791 up->len = 0; 792 up->pending = 0; 793 ip6_flush_pending_frames(sk); 794 } 795 } 796 797 /** 798 * udp6_hwcsum_outgoing - handle outgoing HW checksumming 799 * @sk: socket we are sending on 800 * @skb: sk_buff containing the filled-in UDP header 801 * (checksum field must be zeroed out) 802 */ 803 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, 804 const struct in6_addr *saddr, 805 const struct in6_addr *daddr, int len) 806 { 807 unsigned int offset; 808 struct udphdr *uh = udp_hdr(skb); 809 __wsum csum = 0; 810 811 if (skb_queue_len(&sk->sk_write_queue) == 1) { 812 /* Only one fragment on the socket. */ 813 skb->csum_start = skb_transport_header(skb) - skb->head; 814 skb->csum_offset = offsetof(struct udphdr, check); 815 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); 816 } else { 817 /* 818 * HW-checksum won't work as there are two or more 819 * fragments on the socket so that all csums of sk_buffs 820 * should be together 821 */ 822 offset = skb_transport_offset(skb); 823 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 824 825 skb->ip_summed = CHECKSUM_NONE; 826 827 skb_queue_walk(&sk->sk_write_queue, skb) { 828 csum = csum_add(csum, skb->csum); 829 } 830 831 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 832 csum); 833 if (uh->check == 0) 834 uh->check = CSUM_MANGLED_0; 835 } 836 } 837 838 /* 839 * Sending 840 */ 841 842 static int udp_v6_push_pending_frames(struct sock *sk) 843 { 844 struct sk_buff *skb; 845 struct udphdr *uh; 846 struct udp_sock *up = udp_sk(sk); 847 struct inet_sock *inet = inet_sk(sk); 848 struct flowi *fl = &inet->cork.fl; 849 int err = 0; 850 int is_udplite = IS_UDPLITE(sk); 851 __wsum csum = 0; 852 853 /* Grab the skbuff where UDP header space exists. */ 854 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 855 goto out; 856 857 /* 858 * Create a UDP header 859 */ 860 uh = udp_hdr(skb); 861 uh->source = fl->fl_ip_sport; 862 uh->dest = fl->fl_ip_dport; 863 uh->len = htons(up->len); 864 uh->check = 0; 865 866 if (is_udplite) 867 csum = udplite_csum_outgoing(sk, skb); 868 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ 869 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst, 870 up->len); 871 goto send; 872 } else 873 csum = udp_csum_outgoing(sk, skb); 874 875 /* add protocol-dependent pseudo-header */ 876 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, 877 up->len, fl->proto, csum ); 878 if (uh->check == 0) 879 uh->check = CSUM_MANGLED_0; 880 881 send: 882 err = ip6_push_pending_frames(sk); 883 if (err) { 884 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { 885 UDP6_INC_STATS_USER(sock_net(sk), 886 UDP_MIB_SNDBUFERRORS, is_udplite); 887 err = 0; 888 } 889 } else 890 UDP6_INC_STATS_USER(sock_net(sk), 891 UDP_MIB_OUTDATAGRAMS, is_udplite); 892 out: 893 up->len = 0; 894 up->pending = 0; 895 return err; 896 } 897 898 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, 899 struct msghdr *msg, size_t len) 900 { 901 struct ipv6_txoptions opt_space; 902 struct udp_sock *up = udp_sk(sk); 903 struct inet_sock *inet = inet_sk(sk); 904 struct ipv6_pinfo *np = inet6_sk(sk); 905 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; 906 struct in6_addr *daddr, *final_p = NULL, final; 907 struct ipv6_txoptions *opt = NULL; 908 struct ip6_flowlabel *flowlabel = NULL; 909 struct flowi fl; 910 struct dst_entry *dst; 911 int addr_len = msg->msg_namelen; 912 int ulen = len; 913 int hlimit = -1; 914 int tclass = -1; 915 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; 916 int err; 917 int connected = 0; 918 int is_udplite = IS_UDPLITE(sk); 919 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); 920 921 /* destination address check */ 922 if (sin6) { 923 if (addr_len < offsetof(struct sockaddr, sa_data)) 924 return -EINVAL; 925 926 switch (sin6->sin6_family) { 927 case AF_INET6: 928 if (addr_len < SIN6_LEN_RFC2133) 929 return -EINVAL; 930 daddr = &sin6->sin6_addr; 931 break; 932 case AF_INET: 933 goto do_udp_sendmsg; 934 case AF_UNSPEC: 935 msg->msg_name = sin6 = NULL; 936 msg->msg_namelen = addr_len = 0; 937 daddr = NULL; 938 break; 939 default: 940 return -EINVAL; 941 } 942 } else if (!up->pending) { 943 if (sk->sk_state != TCP_ESTABLISHED) 944 return -EDESTADDRREQ; 945 daddr = &np->daddr; 946 } else 947 daddr = NULL; 948 949 if (daddr) { 950 if (ipv6_addr_v4mapped(daddr)) { 951 struct sockaddr_in sin; 952 sin.sin_family = AF_INET; 953 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; 954 sin.sin_addr.s_addr = daddr->s6_addr32[3]; 955 msg->msg_name = &sin; 956 msg->msg_namelen = sizeof(sin); 957 do_udp_sendmsg: 958 if (__ipv6_only_sock(sk)) 959 return -ENETUNREACH; 960 return udp_sendmsg(iocb, sk, msg, len); 961 } 962 } 963 964 if (up->pending == AF_INET) 965 return udp_sendmsg(iocb, sk, msg, len); 966 967 /* Rough check on arithmetic overflow, 968 better check is made in ip6_append_data(). 969 */ 970 if (len > INT_MAX - sizeof(struct udphdr)) 971 return -EMSGSIZE; 972 973 if (up->pending) { 974 /* 975 * There are pending frames. 976 * The socket lock must be held while it's corked. 977 */ 978 lock_sock(sk); 979 if (likely(up->pending)) { 980 if (unlikely(up->pending != AF_INET6)) { 981 release_sock(sk); 982 return -EAFNOSUPPORT; 983 } 984 dst = NULL; 985 goto do_append_data; 986 } 987 release_sock(sk); 988 } 989 ulen += sizeof(struct udphdr); 990 991 memset(&fl, 0, sizeof(fl)); 992 993 if (sin6) { 994 if (sin6->sin6_port == 0) 995 return -EINVAL; 996 997 fl.fl_ip_dport = sin6->sin6_port; 998 daddr = &sin6->sin6_addr; 999 1000 if (np->sndflow) { 1001 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 1002 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 1003 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 1004 if (flowlabel == NULL) 1005 return -EINVAL; 1006 daddr = &flowlabel->dst; 1007 } 1008 } 1009 1010 /* 1011 * Otherwise it will be difficult to maintain 1012 * sk->sk_dst_cache. 1013 */ 1014 if (sk->sk_state == TCP_ESTABLISHED && 1015 ipv6_addr_equal(daddr, &np->daddr)) 1016 daddr = &np->daddr; 1017 1018 if (addr_len >= sizeof(struct sockaddr_in6) && 1019 sin6->sin6_scope_id && 1020 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 1021 fl.oif = sin6->sin6_scope_id; 1022 } else { 1023 if (sk->sk_state != TCP_ESTABLISHED) 1024 return -EDESTADDRREQ; 1025 1026 fl.fl_ip_dport = inet->inet_dport; 1027 daddr = &np->daddr; 1028 fl.fl6_flowlabel = np->flow_label; 1029 connected = 1; 1030 } 1031 1032 if (!fl.oif) 1033 fl.oif = sk->sk_bound_dev_if; 1034 1035 if (!fl.oif) 1036 fl.oif = np->sticky_pktinfo.ipi6_ifindex; 1037 1038 fl.mark = sk->sk_mark; 1039 1040 if (msg->msg_controllen) { 1041 opt = &opt_space; 1042 memset(opt, 0, sizeof(struct ipv6_txoptions)); 1043 opt->tot_len = sizeof(*opt); 1044 1045 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); 1046 if (err < 0) { 1047 fl6_sock_release(flowlabel); 1048 return err; 1049 } 1050 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 1051 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 1052 if (flowlabel == NULL) 1053 return -EINVAL; 1054 } 1055 if (!(opt->opt_nflen|opt->opt_flen)) 1056 opt = NULL; 1057 connected = 0; 1058 } 1059 if (opt == NULL) 1060 opt = np->opt; 1061 if (flowlabel) 1062 opt = fl6_merge_options(&opt_space, flowlabel, opt); 1063 opt = ipv6_fixup_options(&opt_space, opt); 1064 1065 fl.proto = sk->sk_protocol; 1066 if (!ipv6_addr_any(daddr)) 1067 ipv6_addr_copy(&fl.fl6_dst, daddr); 1068 else 1069 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 1070 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 1071 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 1072 fl.fl_ip_sport = inet->inet_sport; 1073 1074 /* merge ip6_build_xmit from ip6_output */ 1075 if (opt && opt->srcrt) { 1076 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 1077 ipv6_addr_copy(&final, &fl.fl6_dst); 1078 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 1079 final_p = &final; 1080 connected = 0; 1081 } 1082 1083 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { 1084 fl.oif = np->mcast_oif; 1085 connected = 0; 1086 } 1087 1088 security_sk_classify_flow(sk, &fl); 1089 1090 err = ip6_sk_dst_lookup(sk, &dst, &fl); 1091 if (err) 1092 goto out; 1093 if (final_p) 1094 ipv6_addr_copy(&fl.fl6_dst, final_p); 1095 1096 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 1097 if (err < 0) { 1098 if (err == -EREMOTE) 1099 err = ip6_dst_blackhole(sk, &dst, &fl); 1100 if (err < 0) 1101 goto out; 1102 } 1103 1104 if (hlimit < 0) { 1105 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 1106 hlimit = np->mcast_hops; 1107 else 1108 hlimit = np->hop_limit; 1109 if (hlimit < 0) 1110 hlimit = ip6_dst_hoplimit(dst); 1111 } 1112 1113 if (tclass < 0) 1114 tclass = np->tclass; 1115 1116 if (msg->msg_flags&MSG_CONFIRM) 1117 goto do_confirm; 1118 back_from_confirm: 1119 1120 lock_sock(sk); 1121 if (unlikely(up->pending)) { 1122 /* The socket is already corked while preparing it. */ 1123 /* ... which is an evident application bug. --ANK */ 1124 release_sock(sk); 1125 1126 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); 1127 err = -EINVAL; 1128 goto out; 1129 } 1130 1131 up->pending = AF_INET6; 1132 1133 do_append_data: 1134 up->len += ulen; 1135 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; 1136 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, 1137 sizeof(struct udphdr), hlimit, tclass, opt, &fl, 1138 (struct rt6_info*)dst, 1139 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); 1140 if (err) 1141 udp_v6_flush_pending_frames(sk); 1142 else if (!corkreq) 1143 err = udp_v6_push_pending_frames(sk); 1144 else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) 1145 up->pending = 0; 1146 1147 if (dst) { 1148 if (connected) { 1149 ip6_dst_store(sk, dst, 1150 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? 1151 &np->daddr : NULL, 1152 #ifdef CONFIG_IPV6_SUBTREES 1153 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? 1154 &np->saddr : 1155 #endif 1156 NULL); 1157 } else { 1158 dst_release(dst); 1159 } 1160 dst = NULL; 1161 } 1162 1163 if (err > 0) 1164 err = np->recverr ? net_xmit_errno(err) : 0; 1165 release_sock(sk); 1166 out: 1167 dst_release(dst); 1168 fl6_sock_release(flowlabel); 1169 if (!err) 1170 return len; 1171 /* 1172 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting 1173 * ENOBUFS might not be good (it's not tunable per se), but otherwise 1174 * we don't have a good statistic (IpOutDiscards but it can be too many 1175 * things). We could add another new stat but at least for now that 1176 * seems like overkill. 1177 */ 1178 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { 1179 UDP6_INC_STATS_USER(sock_net(sk), 1180 UDP_MIB_SNDBUFERRORS, is_udplite); 1181 } 1182 return err; 1183 1184 do_confirm: 1185 dst_confirm(dst); 1186 if (!(msg->msg_flags&MSG_PROBE) || len) 1187 goto back_from_confirm; 1188 err = 0; 1189 goto out; 1190 } 1191 1192 void udpv6_destroy_sock(struct sock *sk) 1193 { 1194 lock_sock(sk); 1195 udp_v6_flush_pending_frames(sk); 1196 release_sock(sk); 1197 1198 inet6_destroy_sock(sk); 1199 } 1200 1201 /* 1202 * Socket option code for UDP 1203 */ 1204 int udpv6_setsockopt(struct sock *sk, int level, int optname, 1205 char __user *optval, unsigned int optlen) 1206 { 1207 if (level == SOL_UDP || level == SOL_UDPLITE) 1208 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1209 udp_v6_push_pending_frames); 1210 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1211 } 1212 1213 #ifdef CONFIG_COMPAT 1214 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, 1215 char __user *optval, unsigned int optlen) 1216 { 1217 if (level == SOL_UDP || level == SOL_UDPLITE) 1218 return udp_lib_setsockopt(sk, level, optname, optval, optlen, 1219 udp_v6_push_pending_frames); 1220 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); 1221 } 1222 #endif 1223 1224 int udpv6_getsockopt(struct sock *sk, int level, int optname, 1225 char __user *optval, int __user *optlen) 1226 { 1227 if (level == SOL_UDP || level == SOL_UDPLITE) 1228 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1229 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1230 } 1231 1232 #ifdef CONFIG_COMPAT 1233 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, 1234 char __user *optval, int __user *optlen) 1235 { 1236 if (level == SOL_UDP || level == SOL_UDPLITE) 1237 return udp_lib_getsockopt(sk, level, optname, optval, optlen); 1238 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); 1239 } 1240 #endif 1241 1242 static int udp6_ufo_send_check(struct sk_buff *skb) 1243 { 1244 struct ipv6hdr *ipv6h; 1245 struct udphdr *uh; 1246 1247 if (!pskb_may_pull(skb, sizeof(*uh))) 1248 return -EINVAL; 1249 1250 ipv6h = ipv6_hdr(skb); 1251 uh = udp_hdr(skb); 1252 1253 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, 1254 IPPROTO_UDP, 0); 1255 skb->csum_start = skb_transport_header(skb) - skb->head; 1256 skb->csum_offset = offsetof(struct udphdr, check); 1257 skb->ip_summed = CHECKSUM_PARTIAL; 1258 return 0; 1259 } 1260 1261 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features) 1262 { 1263 struct sk_buff *segs = ERR_PTR(-EINVAL); 1264 unsigned int mss; 1265 unsigned int unfrag_ip6hlen, unfrag_len; 1266 struct frag_hdr *fptr; 1267 u8 *mac_start, *prevhdr; 1268 u8 nexthdr; 1269 u8 frag_hdr_sz = sizeof(struct frag_hdr); 1270 int offset; 1271 __wsum csum; 1272 1273 mss = skb_shinfo(skb)->gso_size; 1274 if (unlikely(skb->len <= mss)) 1275 goto out; 1276 1277 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { 1278 /* Packet is from an untrusted source, reset gso_segs. */ 1279 int type = skb_shinfo(skb)->gso_type; 1280 1281 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || 1282 !(type & (SKB_GSO_UDP)))) 1283 goto out; 1284 1285 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); 1286 1287 segs = NULL; 1288 goto out; 1289 } 1290 1291 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot 1292 * do checksum of UDP packets sent as multiple IP fragments. 1293 */ 1294 offset = skb->csum_start - skb_headroom(skb); 1295 csum = skb_checksum(skb, offset, skb->len- offset, 0); 1296 offset += skb->csum_offset; 1297 *(__sum16 *)(skb->data + offset) = csum_fold(csum); 1298 skb->ip_summed = CHECKSUM_NONE; 1299 1300 /* Check if there is enough headroom to insert fragment header. */ 1301 if ((skb_headroom(skb) < frag_hdr_sz) && 1302 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) 1303 goto out; 1304 1305 /* Find the unfragmentable header and shift it left by frag_hdr_sz 1306 * bytes to insert fragment header. 1307 */ 1308 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); 1309 nexthdr = *prevhdr; 1310 *prevhdr = NEXTHDR_FRAGMENT; 1311 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + 1312 unfrag_ip6hlen; 1313 mac_start = skb_mac_header(skb); 1314 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); 1315 1316 skb->mac_header -= frag_hdr_sz; 1317 skb->network_header -= frag_hdr_sz; 1318 1319 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); 1320 fptr->nexthdr = nexthdr; 1321 fptr->reserved = 0; 1322 ipv6_select_ident(fptr); 1323 1324 /* Fragment the skb. ipv6 header and the remaining fields of the 1325 * fragment header are updated in ipv6_gso_segment() 1326 */ 1327 segs = skb_segment(skb, features); 1328 1329 out: 1330 return segs; 1331 } 1332 1333 static const struct inet6_protocol udpv6_protocol = { 1334 .handler = udpv6_rcv, 1335 .err_handler = udpv6_err, 1336 .gso_send_check = udp6_ufo_send_check, 1337 .gso_segment = udp6_ufo_fragment, 1338 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1339 }; 1340 1341 /* ------------------------------------------------------------------------ */ 1342 #ifdef CONFIG_PROC_FS 1343 1344 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) 1345 { 1346 struct inet_sock *inet = inet_sk(sp); 1347 struct ipv6_pinfo *np = inet6_sk(sp); 1348 struct in6_addr *dest, *src; 1349 __u16 destp, srcp; 1350 1351 dest = &np->daddr; 1352 src = &np->rcv_saddr; 1353 destp = ntohs(inet->inet_dport); 1354 srcp = ntohs(inet->inet_sport); 1355 seq_printf(seq, 1356 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1357 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1358 bucket, 1359 src->s6_addr32[0], src->s6_addr32[1], 1360 src->s6_addr32[2], src->s6_addr32[3], srcp, 1361 dest->s6_addr32[0], dest->s6_addr32[1], 1362 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1363 sp->sk_state, 1364 sk_wmem_alloc_get(sp), 1365 sk_rmem_alloc_get(sp), 1366 0, 0L, 0, 1367 sock_i_uid(sp), 0, 1368 sock_i_ino(sp), 1369 atomic_read(&sp->sk_refcnt), sp, 1370 atomic_read(&sp->sk_drops)); 1371 } 1372 1373 int udp6_seq_show(struct seq_file *seq, void *v) 1374 { 1375 if (v == SEQ_START_TOKEN) 1376 seq_printf(seq, 1377 " sl " 1378 "local_address " 1379 "remote_address " 1380 "st tx_queue rx_queue tr tm->when retrnsmt" 1381 " uid timeout inode ref pointer drops\n"); 1382 else 1383 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); 1384 return 0; 1385 } 1386 1387 static struct udp_seq_afinfo udp6_seq_afinfo = { 1388 .name = "udp6", 1389 .family = AF_INET6, 1390 .udp_table = &udp_table, 1391 .seq_fops = { 1392 .owner = THIS_MODULE, 1393 }, 1394 .seq_ops = { 1395 .show = udp6_seq_show, 1396 }, 1397 }; 1398 1399 int udp6_proc_init(struct net *net) 1400 { 1401 return udp_proc_register(net, &udp6_seq_afinfo); 1402 } 1403 1404 void udp6_proc_exit(struct net *net) { 1405 udp_proc_unregister(net, &udp6_seq_afinfo); 1406 } 1407 #endif /* CONFIG_PROC_FS */ 1408 1409 /* ------------------------------------------------------------------------ */ 1410 1411 struct proto udpv6_prot = { 1412 .name = "UDPv6", 1413 .owner = THIS_MODULE, 1414 .close = udp_lib_close, 1415 .connect = ip6_datagram_connect, 1416 .disconnect = udp_disconnect, 1417 .ioctl = udp_ioctl, 1418 .destroy = udpv6_destroy_sock, 1419 .setsockopt = udpv6_setsockopt, 1420 .getsockopt = udpv6_getsockopt, 1421 .sendmsg = udpv6_sendmsg, 1422 .recvmsg = udpv6_recvmsg, 1423 .backlog_rcv = udpv6_queue_rcv_skb, 1424 .hash = udp_lib_hash, 1425 .unhash = udp_lib_unhash, 1426 .get_port = udp_v6_get_port, 1427 .memory_allocated = &udp_memory_allocated, 1428 .sysctl_mem = sysctl_udp_mem, 1429 .sysctl_wmem = &sysctl_udp_wmem_min, 1430 .sysctl_rmem = &sysctl_udp_rmem_min, 1431 .obj_size = sizeof(struct udp6_sock), 1432 .slab_flags = SLAB_DESTROY_BY_RCU, 1433 .h.udp_table = &udp_table, 1434 #ifdef CONFIG_COMPAT 1435 .compat_setsockopt = compat_udpv6_setsockopt, 1436 .compat_getsockopt = compat_udpv6_getsockopt, 1437 #endif 1438 }; 1439 1440 static struct inet_protosw udpv6_protosw = { 1441 .type = SOCK_DGRAM, 1442 .protocol = IPPROTO_UDP, 1443 .prot = &udpv6_prot, 1444 .ops = &inet6_dgram_ops, 1445 .no_check = UDP_CSUM_DEFAULT, 1446 .flags = INET_PROTOSW_PERMANENT, 1447 }; 1448 1449 1450 int __init udpv6_init(void) 1451 { 1452 int ret; 1453 1454 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); 1455 if (ret) 1456 goto out; 1457 1458 ret = inet6_register_protosw(&udpv6_protosw); 1459 if (ret) 1460 goto out_udpv6_protocol; 1461 out: 1462 return ret; 1463 1464 out_udpv6_protocol: 1465 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1466 goto out; 1467 } 1468 1469 void udpv6_exit(void) 1470 { 1471 inet6_unregister_protosw(&udpv6_protosw); 1472 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); 1473 } 1474