| 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 <linux/uaccess.h> |
| 39 | |
| 40 | #include <net/addrconf.h> |
| 41 | #include <net/ndisc.h> |
| 42 | #include <net/protocol.h> |
| 43 | #include <net/transp_v6.h> |
| 44 | #include <net/ip6_route.h> |
| 45 | #include <net/raw.h> |
| 46 | #include <net/tcp_states.h> |
| 47 | #include <net/ip6_checksum.h> |
| 48 | #include <net/xfrm.h> |
| 49 | #include <net/inet_hashtables.h> |
| 50 | #include <net/inet6_hashtables.h> |
| 51 | #include <net/busy_poll.h> |
| 52 | #include <net/sock_reuseport.h> |
| 53 | |
| 54 | #include <linux/proc_fs.h> |
| 55 | #include <linux/seq_file.h> |
| 56 | #include <trace/events/skb.h> |
| 57 | #include "udp_impl.h" |
| 58 | |
| 59 | static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) |
| 60 | { |
| 61 | #if defined(CONFIG_NET_L3_MASTER_DEV) |
| 62 | if (!net->ipv4.sysctl_udp_l3mdev_accept && |
| 63 | skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) |
| 64 | return true; |
| 65 | #endif |
| 66 | return false; |
| 67 | } |
| 68 | |
| 69 | static u32 udp6_ehashfn(const struct net *net, |
| 70 | const struct in6_addr *laddr, |
| 71 | const u16 lport, |
| 72 | const struct in6_addr *faddr, |
| 73 | const __be16 fport) |
| 74 | { |
| 75 | static u32 udp6_ehash_secret __read_mostly; |
| 76 | static u32 udp_ipv6_hash_secret __read_mostly; |
| 77 | |
| 78 | u32 lhash, fhash; |
| 79 | |
| 80 | net_get_random_once(&udp6_ehash_secret, |
| 81 | sizeof(udp6_ehash_secret)); |
| 82 | net_get_random_once(&udp_ipv6_hash_secret, |
| 83 | sizeof(udp_ipv6_hash_secret)); |
| 84 | |
| 85 | lhash = (__force u32)laddr->s6_addr32[3]; |
| 86 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); |
| 87 | |
| 88 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
| 89 | udp_ipv6_hash_secret + net_hash_mix(net)); |
| 90 | } |
| 91 | |
| 92 | static u32 udp6_portaddr_hash(const struct net *net, |
| 93 | const struct in6_addr *addr6, |
| 94 | unsigned int port) |
| 95 | { |
| 96 | unsigned int hash, mix = net_hash_mix(net); |
| 97 | |
| 98 | if (ipv6_addr_any(addr6)) |
| 99 | hash = jhash_1word(0, mix); |
| 100 | else if (ipv6_addr_v4mapped(addr6)) |
| 101 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
| 102 | else |
| 103 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
| 104 | |
| 105 | return hash ^ port; |
| 106 | } |
| 107 | |
| 108 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
| 109 | { |
| 110 | unsigned int hash2_nulladdr = |
| 111 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
| 112 | unsigned int hash2_partial = |
| 113 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
| 114 | |
| 115 | /* precompute partial secondary hash */ |
| 116 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| 117 | return udp_lib_get_port(sk, snum, hash2_nulladdr); |
| 118 | } |
| 119 | |
| 120 | static void udp_v6_rehash(struct sock *sk) |
| 121 | { |
| 122 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), |
| 123 | &sk->sk_v6_rcv_saddr, |
| 124 | inet_sk(sk)->inet_num); |
| 125 | |
| 126 | udp_lib_rehash(sk, new_hash); |
| 127 | } |
| 128 | |
| 129 | static int compute_score(struct sock *sk, struct net *net, |
| 130 | const struct in6_addr *saddr, __be16 sport, |
| 131 | const struct in6_addr *daddr, unsigned short hnum, |
| 132 | int dif, int sdif, bool exact_dif) |
| 133 | { |
| 134 | int score; |
| 135 | struct inet_sock *inet; |
| 136 | |
| 137 | if (!net_eq(sock_net(sk), net) || |
| 138 | udp_sk(sk)->udp_port_hash != hnum || |
| 139 | sk->sk_family != PF_INET6) |
| 140 | return -1; |
| 141 | |
| 142 | score = 0; |
| 143 | inet = inet_sk(sk); |
| 144 | |
| 145 | if (inet->inet_dport) { |
| 146 | if (inet->inet_dport != sport) |
| 147 | return -1; |
| 148 | score++; |
| 149 | } |
| 150 | |
| 151 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
| 152 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
| 153 | return -1; |
| 154 | score++; |
| 155 | } |
| 156 | |
| 157 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
| 158 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) |
| 159 | return -1; |
| 160 | score++; |
| 161 | } |
| 162 | |
| 163 | if (sk->sk_bound_dev_if || exact_dif) { |
| 164 | bool dev_match = (sk->sk_bound_dev_if == dif || |
| 165 | sk->sk_bound_dev_if == sdif); |
| 166 | |
| 167 | if (!dev_match) |
| 168 | return -1; |
| 169 | if (sk->sk_bound_dev_if) |
| 170 | score++; |
| 171 | } |
| 172 | |
| 173 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
| 174 | score++; |
| 175 | |
| 176 | return score; |
| 177 | } |
| 178 | |
| 179 | /* called with rcu_read_lock() */ |
| 180 | static struct sock *udp6_lib_lookup2(struct net *net, |
| 181 | const struct in6_addr *saddr, __be16 sport, |
| 182 | const struct in6_addr *daddr, unsigned int hnum, |
| 183 | int dif, int sdif, bool exact_dif, |
| 184 | struct udp_hslot *hslot2, struct sk_buff *skb) |
| 185 | { |
| 186 | struct sock *sk, *result; |
| 187 | int score, badness, matches = 0, reuseport = 0; |
| 188 | u32 hash = 0; |
| 189 | |
| 190 | result = NULL; |
| 191 | badness = -1; |
| 192 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
| 193 | score = compute_score(sk, net, saddr, sport, |
| 194 | daddr, hnum, dif, sdif, exact_dif); |
| 195 | if (score > badness) { |
| 196 | reuseport = sk->sk_reuseport; |
| 197 | if (reuseport) { |
| 198 | hash = udp6_ehashfn(net, daddr, hnum, |
| 199 | saddr, sport); |
| 200 | |
| 201 | result = reuseport_select_sock(sk, hash, skb, |
| 202 | sizeof(struct udphdr)); |
| 203 | if (result) |
| 204 | return result; |
| 205 | matches = 1; |
| 206 | } |
| 207 | result = sk; |
| 208 | badness = score; |
| 209 | } else if (score == badness && reuseport) { |
| 210 | matches++; |
| 211 | if (reciprocal_scale(hash, matches) == 0) |
| 212 | result = sk; |
| 213 | hash = next_pseudo_random32(hash); |
| 214 | } |
| 215 | } |
| 216 | return result; |
| 217 | } |
| 218 | |
| 219 | /* rcu_read_lock() must be held */ |
| 220 | struct sock *__udp6_lib_lookup(struct net *net, |
| 221 | const struct in6_addr *saddr, __be16 sport, |
| 222 | const struct in6_addr *daddr, __be16 dport, |
| 223 | int dif, int sdif, struct udp_table *udptable, |
| 224 | struct sk_buff *skb) |
| 225 | { |
| 226 | struct sock *sk, *result; |
| 227 | unsigned short hnum = ntohs(dport); |
| 228 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| 229 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
| 230 | bool exact_dif = udp6_lib_exact_dif_match(net, skb); |
| 231 | int score, badness, matches = 0, reuseport = 0; |
| 232 | u32 hash = 0; |
| 233 | |
| 234 | if (hslot->count > 10) { |
| 235 | hash2 = udp6_portaddr_hash(net, daddr, hnum); |
| 236 | slot2 = hash2 & udptable->mask; |
| 237 | hslot2 = &udptable->hash2[slot2]; |
| 238 | if (hslot->count < hslot2->count) |
| 239 | goto begin; |
| 240 | |
| 241 | result = udp6_lib_lookup2(net, saddr, sport, |
| 242 | daddr, hnum, dif, sdif, exact_dif, |
| 243 | hslot2, skb); |
| 244 | if (!result) { |
| 245 | unsigned int old_slot2 = slot2; |
| 246 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); |
| 247 | slot2 = hash2 & udptable->mask; |
| 248 | /* avoid searching the same slot again. */ |
| 249 | if (unlikely(slot2 == old_slot2)) |
| 250 | return result; |
| 251 | |
| 252 | hslot2 = &udptable->hash2[slot2]; |
| 253 | if (hslot->count < hslot2->count) |
| 254 | goto begin; |
| 255 | |
| 256 | result = udp6_lib_lookup2(net, saddr, sport, |
| 257 | daddr, hnum, dif, sdif, |
| 258 | exact_dif, hslot2, |
| 259 | skb); |
| 260 | } |
| 261 | return result; |
| 262 | } |
| 263 | begin: |
| 264 | result = NULL; |
| 265 | badness = -1; |
| 266 | sk_for_each_rcu(sk, &hslot->head) { |
| 267 | score = compute_score(sk, net, saddr, sport, daddr, hnum, dif, |
| 268 | sdif, exact_dif); |
| 269 | if (score > badness) { |
| 270 | reuseport = sk->sk_reuseport; |
| 271 | if (reuseport) { |
| 272 | hash = udp6_ehashfn(net, daddr, hnum, |
| 273 | saddr, sport); |
| 274 | result = reuseport_select_sock(sk, hash, skb, |
| 275 | sizeof(struct udphdr)); |
| 276 | if (result) |
| 277 | return result; |
| 278 | matches = 1; |
| 279 | } |
| 280 | result = sk; |
| 281 | badness = score; |
| 282 | } else if (score == badness && reuseport) { |
| 283 | matches++; |
| 284 | if (reciprocal_scale(hash, matches) == 0) |
| 285 | result = sk; |
| 286 | hash = next_pseudo_random32(hash); |
| 287 | } |
| 288 | } |
| 289 | return result; |
| 290 | } |
| 291 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
| 292 | |
| 293 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
| 294 | __be16 sport, __be16 dport, |
| 295 | struct udp_table *udptable) |
| 296 | { |
| 297 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
| 298 | |
| 299 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
| 300 | &iph->daddr, dport, inet6_iif(skb), |
| 301 | inet6_sdif(skb), udptable, skb); |
| 302 | } |
| 303 | |
| 304 | struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, |
| 305 | __be16 sport, __be16 dport) |
| 306 | { |
| 307 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
| 308 | |
| 309 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
| 310 | &iph->daddr, dport, inet6_iif(skb), |
| 311 | inet6_sdif(skb), &udp_table, skb); |
| 312 | } |
| 313 | EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); |
| 314 | |
| 315 | /* Must be called under rcu_read_lock(). |
| 316 | * Does increment socket refcount. |
| 317 | */ |
| 318 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ |
| 319 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \ |
| 320 | IS_ENABLED(CONFIG_NF_SOCKET_IPV6) |
| 321 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
| 322 | const struct in6_addr *daddr, __be16 dport, int dif) |
| 323 | { |
| 324 | struct sock *sk; |
| 325 | |
| 326 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, |
| 327 | dif, 0, &udp_table, NULL); |
| 328 | if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) |
| 329 | sk = NULL; |
| 330 | return sk; |
| 331 | } |
| 332 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); |
| 333 | #endif |
| 334 | |
| 335 | /* do not use the scratch area len for jumbogram: their length execeeds the |
| 336 | * scratch area space; note that the IP6CB flags is still in the first |
| 337 | * cacheline, so checking for jumbograms is cheap |
| 338 | */ |
| 339 | static int udp6_skb_len(struct sk_buff *skb) |
| 340 | { |
| 341 | return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * This should be easy, if there is something there we |
| 346 | * return it, otherwise we block. |
| 347 | */ |
| 348 | |
| 349 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
| 350 | int noblock, int flags, int *addr_len) |
| 351 | { |
| 352 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 353 | struct inet_sock *inet = inet_sk(sk); |
| 354 | struct sk_buff *skb; |
| 355 | unsigned int ulen, copied; |
| 356 | int peeked, peeking, off; |
| 357 | int err; |
| 358 | int is_udplite = IS_UDPLITE(sk); |
| 359 | bool checksum_valid = false; |
| 360 | int is_udp4; |
| 361 | |
| 362 | if (flags & MSG_ERRQUEUE) |
| 363 | return ipv6_recv_error(sk, msg, len, addr_len); |
| 364 | |
| 365 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
| 366 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
| 367 | |
| 368 | try_again: |
| 369 | peeking = flags & MSG_PEEK; |
| 370 | off = sk_peek_offset(sk, flags); |
| 371 | skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); |
| 372 | if (!skb) |
| 373 | return err; |
| 374 | |
| 375 | ulen = udp6_skb_len(skb); |
| 376 | copied = len; |
| 377 | if (copied > ulen - off) |
| 378 | copied = ulen - off; |
| 379 | else if (copied < ulen) |
| 380 | msg->msg_flags |= MSG_TRUNC; |
| 381 | |
| 382 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
| 383 | |
| 384 | /* |
| 385 | * If checksum is needed at all, try to do it while copying the |
| 386 | * data. If the data is truncated, or if we only want a partial |
| 387 | * coverage checksum (UDP-Lite), do it before the copy. |
| 388 | */ |
| 389 | |
| 390 | if (copied < ulen || peeking || |
| 391 | (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { |
| 392 | checksum_valid = udp_skb_csum_unnecessary(skb) || |
| 393 | !__udp_lib_checksum_complete(skb); |
| 394 | if (!checksum_valid) |
| 395 | goto csum_copy_err; |
| 396 | } |
| 397 | |
| 398 | if (checksum_valid || udp_skb_csum_unnecessary(skb)) { |
| 399 | if (udp_skb_is_linear(skb)) |
| 400 | err = copy_linear_skb(skb, copied, off, &msg->msg_iter); |
| 401 | else |
| 402 | err = skb_copy_datagram_msg(skb, off, msg, copied); |
| 403 | } else { |
| 404 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
| 405 | if (err == -EINVAL) |
| 406 | goto csum_copy_err; |
| 407 | } |
| 408 | if (unlikely(err)) { |
| 409 | if (!peeked) { |
| 410 | atomic_inc(&sk->sk_drops); |
| 411 | if (is_udp4) |
| 412 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
| 413 | is_udplite); |
| 414 | else |
| 415 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
| 416 | is_udplite); |
| 417 | } |
| 418 | kfree_skb(skb); |
| 419 | return err; |
| 420 | } |
| 421 | if (!peeked) { |
| 422 | if (is_udp4) |
| 423 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
| 424 | is_udplite); |
| 425 | else |
| 426 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
| 427 | is_udplite); |
| 428 | } |
| 429 | |
| 430 | sock_recv_ts_and_drops(msg, sk, skb); |
| 431 | |
| 432 | /* Copy the address. */ |
| 433 | if (msg->msg_name) { |
| 434 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
| 435 | sin6->sin6_family = AF_INET6; |
| 436 | sin6->sin6_port = udp_hdr(skb)->source; |
| 437 | sin6->sin6_flowinfo = 0; |
| 438 | |
| 439 | if (is_udp4) { |
| 440 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
| 441 | &sin6->sin6_addr); |
| 442 | sin6->sin6_scope_id = 0; |
| 443 | } else { |
| 444 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
| 445 | sin6->sin6_scope_id = |
| 446 | ipv6_iface_scope_id(&sin6->sin6_addr, |
| 447 | inet6_iif(skb)); |
| 448 | } |
| 449 | *addr_len = sizeof(*sin6); |
| 450 | } |
| 451 | |
| 452 | if (np->rxopt.all) |
| 453 | ip6_datagram_recv_common_ctl(sk, msg, skb); |
| 454 | |
| 455 | if (is_udp4) { |
| 456 | if (inet->cmsg_flags) |
| 457 | ip_cmsg_recv_offset(msg, sk, skb, |
| 458 | sizeof(struct udphdr), off); |
| 459 | } else { |
| 460 | if (np->rxopt.all) |
| 461 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
| 462 | } |
| 463 | |
| 464 | err = copied; |
| 465 | if (flags & MSG_TRUNC) |
| 466 | err = ulen; |
| 467 | |
| 468 | skb_consume_udp(sk, skb, peeking ? -err : err); |
| 469 | return err; |
| 470 | |
| 471 | csum_copy_err: |
| 472 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
| 473 | udp_skb_destructor)) { |
| 474 | if (is_udp4) { |
| 475 | UDP_INC_STATS(sock_net(sk), |
| 476 | UDP_MIB_CSUMERRORS, is_udplite); |
| 477 | UDP_INC_STATS(sock_net(sk), |
| 478 | UDP_MIB_INERRORS, is_udplite); |
| 479 | } else { |
| 480 | UDP6_INC_STATS(sock_net(sk), |
| 481 | UDP_MIB_CSUMERRORS, is_udplite); |
| 482 | UDP6_INC_STATS(sock_net(sk), |
| 483 | UDP_MIB_INERRORS, is_udplite); |
| 484 | } |
| 485 | } |
| 486 | kfree_skb(skb); |
| 487 | |
| 488 | /* starting over for a new packet, but check if we need to yield */ |
| 489 | cond_resched(); |
| 490 | msg->msg_flags &= ~MSG_TRUNC; |
| 491 | goto try_again; |
| 492 | } |
| 493 | |
| 494 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 495 | u8 type, u8 code, int offset, __be32 info, |
| 496 | struct udp_table *udptable) |
| 497 | { |
| 498 | struct ipv6_pinfo *np; |
| 499 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
| 500 | const struct in6_addr *saddr = &hdr->saddr; |
| 501 | const struct in6_addr *daddr = &hdr->daddr; |
| 502 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
| 503 | struct sock *sk; |
| 504 | int harderr; |
| 505 | int err; |
| 506 | struct net *net = dev_net(skb->dev); |
| 507 | |
| 508 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
| 509 | inet6_iif(skb), 0, udptable, skb); |
| 510 | if (!sk) { |
| 511 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
| 512 | ICMP6_MIB_INERRORS); |
| 513 | return; |
| 514 | } |
| 515 | |
| 516 | harderr = icmpv6_err_convert(type, code, &err); |
| 517 | np = inet6_sk(sk); |
| 518 | |
| 519 | if (type == ICMPV6_PKT_TOOBIG) { |
| 520 | if (!ip6_sk_accept_pmtu(sk)) |
| 521 | goto out; |
| 522 | ip6_sk_update_pmtu(skb, sk, info); |
| 523 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
| 524 | harderr = 1; |
| 525 | } |
| 526 | if (type == NDISC_REDIRECT) { |
| 527 | ip6_sk_redirect(skb, sk); |
| 528 | goto out; |
| 529 | } |
| 530 | |
| 531 | if (!np->recverr) { |
| 532 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| 533 | goto out; |
| 534 | } else { |
| 535 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
| 536 | } |
| 537 | |
| 538 | sk->sk_err = err; |
| 539 | sk->sk_error_report(sk); |
| 540 | out: |
| 541 | return; |
| 542 | } |
| 543 | |
| 544 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 545 | { |
| 546 | int rc; |
| 547 | |
| 548 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
| 549 | sock_rps_save_rxhash(sk, skb); |
| 550 | sk_mark_napi_id(sk, skb); |
| 551 | sk_incoming_cpu_update(sk); |
| 552 | } else { |
| 553 | sk_mark_napi_id_once(sk, skb); |
| 554 | } |
| 555 | |
| 556 | rc = __udp_enqueue_schedule_skb(sk, skb); |
| 557 | if (rc < 0) { |
| 558 | int is_udplite = IS_UDPLITE(sk); |
| 559 | |
| 560 | /* Note that an ENOMEM error is charged twice */ |
| 561 | if (rc == -ENOMEM) |
| 562 | UDP6_INC_STATS(sock_net(sk), |
| 563 | UDP_MIB_RCVBUFERRORS, is_udplite); |
| 564 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
| 565 | kfree_skb(skb); |
| 566 | return -1; |
| 567 | } |
| 568 | |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | static __inline__ void udpv6_err(struct sk_buff *skb, |
| 573 | struct inet6_skb_parm *opt, u8 type, |
| 574 | u8 code, int offset, __be32 info) |
| 575 | { |
| 576 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
| 577 | } |
| 578 | |
| 579 | static struct static_key udpv6_encap_needed __read_mostly; |
| 580 | void udpv6_encap_enable(void) |
| 581 | { |
| 582 | static_key_enable(&udpv6_encap_needed); |
| 583 | } |
| 584 | EXPORT_SYMBOL(udpv6_encap_enable); |
| 585 | |
| 586 | static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 587 | { |
| 588 | struct udp_sock *up = udp_sk(sk); |
| 589 | int is_udplite = IS_UDPLITE(sk); |
| 590 | |
| 591 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 592 | goto drop; |
| 593 | |
| 594 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
| 595 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
| 596 | |
| 597 | /* |
| 598 | * This is an encapsulation socket so pass the skb to |
| 599 | * the socket's udp_encap_rcv() hook. Otherwise, just |
| 600 | * fall through and pass this up the UDP socket. |
| 601 | * up->encap_rcv() returns the following value: |
| 602 | * =0 if skb was successfully passed to the encap |
| 603 | * handler or was discarded by it. |
| 604 | * >0 if skb should be passed on to UDP. |
| 605 | * <0 if skb should be resubmitted as proto -N |
| 606 | */ |
| 607 | |
| 608 | /* if we're overly short, let UDP handle it */ |
| 609 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
| 610 | if (encap_rcv) { |
| 611 | int ret; |
| 612 | |
| 613 | /* Verify checksum before giving to encap */ |
| 614 | if (udp_lib_checksum_complete(skb)) |
| 615 | goto csum_error; |
| 616 | |
| 617 | ret = encap_rcv(sk, skb); |
| 618 | if (ret <= 0) { |
| 619 | __UDP_INC_STATS(sock_net(sk), |
| 620 | UDP_MIB_INDATAGRAMS, |
| 621 | is_udplite); |
| 622 | return -ret; |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | /* FALLTHROUGH -- it's a UDP Packet */ |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). |
| 631 | */ |
| 632 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
| 633 | |
| 634 | if (up->pcrlen == 0) { /* full coverage was set */ |
| 635 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
| 636 | UDP_SKB_CB(skb)->cscov, skb->len); |
| 637 | goto drop; |
| 638 | } |
| 639 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
| 640 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
| 641 | UDP_SKB_CB(skb)->cscov, up->pcrlen); |
| 642 | goto drop; |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | prefetch(&sk->sk_rmem_alloc); |
| 647 | if (rcu_access_pointer(sk->sk_filter) && |
| 648 | udp_lib_checksum_complete(skb)) |
| 649 | goto csum_error; |
| 650 | |
| 651 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
| 652 | goto drop; |
| 653 | |
| 654 | udp_csum_pull_header(skb); |
| 655 | |
| 656 | skb_dst_drop(skb); |
| 657 | |
| 658 | return __udpv6_queue_rcv_skb(sk, skb); |
| 659 | |
| 660 | csum_error: |
| 661 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
| 662 | drop: |
| 663 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
| 664 | atomic_inc(&sk->sk_drops); |
| 665 | kfree_skb(skb); |
| 666 | return -1; |
| 667 | } |
| 668 | |
| 669 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
| 670 | __be16 loc_port, const struct in6_addr *loc_addr, |
| 671 | __be16 rmt_port, const struct in6_addr *rmt_addr, |
| 672 | int dif, unsigned short hnum) |
| 673 | { |
| 674 | struct inet_sock *inet = inet_sk(sk); |
| 675 | |
| 676 | if (!net_eq(sock_net(sk), net)) |
| 677 | return false; |
| 678 | |
| 679 | if (udp_sk(sk)->udp_port_hash != hnum || |
| 680 | sk->sk_family != PF_INET6 || |
| 681 | (inet->inet_dport && inet->inet_dport != rmt_port) || |
| 682 | (!ipv6_addr_any(&sk->sk_v6_daddr) && |
| 683 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || |
| 684 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
| 685 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
| 686 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) |
| 687 | return false; |
| 688 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) |
| 689 | return false; |
| 690 | return true; |
| 691 | } |
| 692 | |
| 693 | static void udp6_csum_zero_error(struct sk_buff *skb) |
| 694 | { |
| 695 | /* RFC 2460 section 8.1 says that we SHOULD log |
| 696 | * this error. Well, it is reasonable. |
| 697 | */ |
| 698 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
| 699 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), |
| 700 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Note: called only from the BH handler context, |
| 705 | * so we don't need to lock the hashes. |
| 706 | */ |
| 707 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
| 708 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
| 709 | struct udp_table *udptable, int proto) |
| 710 | { |
| 711 | struct sock *sk, *first = NULL; |
| 712 | const struct udphdr *uh = udp_hdr(skb); |
| 713 | unsigned short hnum = ntohs(uh->dest); |
| 714 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); |
| 715 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
| 716 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
| 717 | int dif = inet6_iif(skb); |
| 718 | struct hlist_node *node; |
| 719 | struct sk_buff *nskb; |
| 720 | |
| 721 | if (use_hash2) { |
| 722 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & |
| 723 | udptable->mask; |
| 724 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask; |
| 725 | start_lookup: |
| 726 | hslot = &udptable->hash2[hash2]; |
| 727 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
| 728 | } |
| 729 | |
| 730 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
| 731 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, |
| 732 | uh->source, saddr, dif, hnum)) |
| 733 | continue; |
| 734 | /* If zero checksum and no_check is not on for |
| 735 | * the socket then skip it. |
| 736 | */ |
| 737 | if (!uh->check && !udp_sk(sk)->no_check6_rx) |
| 738 | continue; |
| 739 | if (!first) { |
| 740 | first = sk; |
| 741 | continue; |
| 742 | } |
| 743 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 744 | if (unlikely(!nskb)) { |
| 745 | atomic_inc(&sk->sk_drops); |
| 746 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
| 747 | IS_UDPLITE(sk)); |
| 748 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, |
| 749 | IS_UDPLITE(sk)); |
| 750 | continue; |
| 751 | } |
| 752 | |
| 753 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
| 754 | consume_skb(nskb); |
| 755 | } |
| 756 | |
| 757 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
| 758 | if (use_hash2 && hash2 != hash2_any) { |
| 759 | hash2 = hash2_any; |
| 760 | goto start_lookup; |
| 761 | } |
| 762 | |
| 763 | if (first) { |
| 764 | if (udpv6_queue_rcv_skb(first, skb) > 0) |
| 765 | consume_skb(skb); |
| 766 | } else { |
| 767 | kfree_skb(skb); |
| 768 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
| 769 | proto == IPPROTO_UDPLITE); |
| 770 | } |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
| 775 | { |
| 776 | if (udp_sk_rx_dst_set(sk, dst)) { |
| 777 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
| 778 | |
| 779 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |
| 784 | * return code conversion for ip layer consumption |
| 785 | */ |
| 786 | static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, |
| 787 | struct udphdr *uh) |
| 788 | { |
| 789 | int ret; |
| 790 | |
| 791 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
| 792 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
| 793 | ip6_compute_pseudo); |
| 794 | |
| 795 | ret = udpv6_queue_rcv_skb(sk, skb); |
| 796 | |
| 797 | /* a return value > 0 means to resubmit the input, but |
| 798 | * it wants the return to be -protocol, or 0 |
| 799 | */ |
| 800 | if (ret > 0) |
| 801 | return -ret; |
| 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
| 806 | int proto) |
| 807 | { |
| 808 | const struct in6_addr *saddr, *daddr; |
| 809 | struct net *net = dev_net(skb->dev); |
| 810 | struct udphdr *uh; |
| 811 | struct sock *sk; |
| 812 | u32 ulen = 0; |
| 813 | |
| 814 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 815 | goto discard; |
| 816 | |
| 817 | saddr = &ipv6_hdr(skb)->saddr; |
| 818 | daddr = &ipv6_hdr(skb)->daddr; |
| 819 | uh = udp_hdr(skb); |
| 820 | |
| 821 | ulen = ntohs(uh->len); |
| 822 | if (ulen > skb->len) |
| 823 | goto short_packet; |
| 824 | |
| 825 | if (proto == IPPROTO_UDP) { |
| 826 | /* UDP validates ulen. */ |
| 827 | |
| 828 | /* Check for jumbo payload */ |
| 829 | if (ulen == 0) |
| 830 | ulen = skb->len; |
| 831 | |
| 832 | if (ulen < sizeof(*uh)) |
| 833 | goto short_packet; |
| 834 | |
| 835 | if (ulen < skb->len) { |
| 836 | if (pskb_trim_rcsum(skb, ulen)) |
| 837 | goto short_packet; |
| 838 | saddr = &ipv6_hdr(skb)->saddr; |
| 839 | daddr = &ipv6_hdr(skb)->daddr; |
| 840 | uh = udp_hdr(skb); |
| 841 | } |
| 842 | } |
| 843 | |
| 844 | if (udp6_csum_init(skb, uh, proto)) |
| 845 | goto csum_error; |
| 846 | |
| 847 | /* Check if the socket is already available, e.g. due to early demux */ |
| 848 | sk = skb_steal_sock(skb); |
| 849 | if (sk) { |
| 850 | struct dst_entry *dst = skb_dst(skb); |
| 851 | int ret; |
| 852 | |
| 853 | if (unlikely(sk->sk_rx_dst != dst)) |
| 854 | udp6_sk_rx_dst_set(sk, dst); |
| 855 | |
| 856 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
| 857 | sock_put(sk); |
| 858 | goto report_csum_error; |
| 859 | } |
| 860 | |
| 861 | ret = udp6_unicast_rcv_skb(sk, skb, uh); |
| 862 | sock_put(sk); |
| 863 | return ret; |
| 864 | } |
| 865 | |
| 866 | /* |
| 867 | * Multicast receive code |
| 868 | */ |
| 869 | if (ipv6_addr_is_multicast(daddr)) |
| 870 | return __udp6_lib_mcast_deliver(net, skb, |
| 871 | saddr, daddr, udptable, proto); |
| 872 | |
| 873 | /* Unicast */ |
| 874 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
| 875 | if (sk) { |
| 876 | if (!uh->check && !udp_sk(sk)->no_check6_rx) |
| 877 | goto report_csum_error; |
| 878 | return udp6_unicast_rcv_skb(sk, skb, uh); |
| 879 | } |
| 880 | |
| 881 | if (!uh->check) |
| 882 | goto report_csum_error; |
| 883 | |
| 884 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 885 | goto discard; |
| 886 | |
| 887 | if (udp_lib_checksum_complete(skb)) |
| 888 | goto csum_error; |
| 889 | |
| 890 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
| 891 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
| 892 | |
| 893 | kfree_skb(skb); |
| 894 | return 0; |
| 895 | |
| 896 | short_packet: |
| 897 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
| 898 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
| 899 | saddr, ntohs(uh->source), |
| 900 | ulen, skb->len, |
| 901 | daddr, ntohs(uh->dest)); |
| 902 | goto discard; |
| 903 | |
| 904 | report_csum_error: |
| 905 | udp6_csum_zero_error(skb); |
| 906 | csum_error: |
| 907 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
| 908 | discard: |
| 909 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
| 910 | kfree_skb(skb); |
| 911 | return 0; |
| 912 | } |
| 913 | |
| 914 | |
| 915 | static struct sock *__udp6_lib_demux_lookup(struct net *net, |
| 916 | __be16 loc_port, const struct in6_addr *loc_addr, |
| 917 | __be16 rmt_port, const struct in6_addr *rmt_addr, |
| 918 | int dif, int sdif) |
| 919 | { |
| 920 | unsigned short hnum = ntohs(loc_port); |
| 921 | unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum); |
| 922 | unsigned int slot2 = hash2 & udp_table.mask; |
| 923 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; |
| 924 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); |
| 925 | struct sock *sk; |
| 926 | |
| 927 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
| 928 | if (sk->sk_state == TCP_ESTABLISHED && |
| 929 | INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) |
| 930 | return sk; |
| 931 | /* Only check first socket in chain */ |
| 932 | break; |
| 933 | } |
| 934 | return NULL; |
| 935 | } |
| 936 | |
| 937 | static void udp_v6_early_demux(struct sk_buff *skb) |
| 938 | { |
| 939 | struct net *net = dev_net(skb->dev); |
| 940 | const struct udphdr *uh; |
| 941 | struct sock *sk; |
| 942 | struct dst_entry *dst; |
| 943 | int dif = skb->dev->ifindex; |
| 944 | int sdif = inet6_sdif(skb); |
| 945 | |
| 946 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + |
| 947 | sizeof(struct udphdr))) |
| 948 | return; |
| 949 | |
| 950 | uh = udp_hdr(skb); |
| 951 | |
| 952 | if (skb->pkt_type == PACKET_HOST) |
| 953 | sk = __udp6_lib_demux_lookup(net, uh->dest, |
| 954 | &ipv6_hdr(skb)->daddr, |
| 955 | uh->source, &ipv6_hdr(skb)->saddr, |
| 956 | dif, sdif); |
| 957 | else |
| 958 | return; |
| 959 | |
| 960 | if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) |
| 961 | return; |
| 962 | |
| 963 | skb->sk = sk; |
| 964 | skb->destructor = sock_efree; |
| 965 | dst = READ_ONCE(sk->sk_rx_dst); |
| 966 | |
| 967 | if (dst) |
| 968 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
| 969 | if (dst) { |
| 970 | /* set noref for now. |
| 971 | * any place which wants to hold dst has to call |
| 972 | * dst_hold_safe() |
| 973 | */ |
| 974 | skb_dst_set_noref(skb, dst); |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
| 979 | { |
| 980 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
| 981 | } |
| 982 | |
| 983 | /* |
| 984 | * Throw away all pending data and cancel the corking. Socket is locked. |
| 985 | */ |
| 986 | static void udp_v6_flush_pending_frames(struct sock *sk) |
| 987 | { |
| 988 | struct udp_sock *up = udp_sk(sk); |
| 989 | |
| 990 | if (up->pending == AF_INET) |
| 991 | udp_flush_pending_frames(sk); |
| 992 | else if (up->pending) { |
| 993 | up->len = 0; |
| 994 | up->pending = 0; |
| 995 | ip6_flush_pending_frames(sk); |
| 996 | } |
| 997 | } |
| 998 | |
| 999 | /** |
| 1000 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
| 1001 | * @sk: socket we are sending on |
| 1002 | * @skb: sk_buff containing the filled-in UDP header |
| 1003 | * (checksum field must be zeroed out) |
| 1004 | */ |
| 1005 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, |
| 1006 | const struct in6_addr *saddr, |
| 1007 | const struct in6_addr *daddr, int len) |
| 1008 | { |
| 1009 | unsigned int offset; |
| 1010 | struct udphdr *uh = udp_hdr(skb); |
| 1011 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
| 1012 | __wsum csum = 0; |
| 1013 | |
| 1014 | if (!frags) { |
| 1015 | /* Only one fragment on the socket. */ |
| 1016 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 1017 | skb->csum_offset = offsetof(struct udphdr, check); |
| 1018 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); |
| 1019 | } else { |
| 1020 | /* |
| 1021 | * HW-checksum won't work as there are two or more |
| 1022 | * fragments on the socket so that all csums of sk_buffs |
| 1023 | * should be together |
| 1024 | */ |
| 1025 | offset = skb_transport_offset(skb); |
| 1026 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 1027 | csum = skb->csum; |
| 1028 | |
| 1029 | skb->ip_summed = CHECKSUM_NONE; |
| 1030 | |
| 1031 | do { |
| 1032 | csum = csum_add(csum, frags->csum); |
| 1033 | } while ((frags = frags->next)); |
| 1034 | |
| 1035 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, |
| 1036 | csum); |
| 1037 | if (uh->check == 0) |
| 1038 | uh->check = CSUM_MANGLED_0; |
| 1039 | } |
| 1040 | } |
| 1041 | |
| 1042 | /* |
| 1043 | * Sending |
| 1044 | */ |
| 1045 | |
| 1046 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
| 1047 | { |
| 1048 | struct sock *sk = skb->sk; |
| 1049 | struct udphdr *uh; |
| 1050 | int err = 0; |
| 1051 | int is_udplite = IS_UDPLITE(sk); |
| 1052 | __wsum csum = 0; |
| 1053 | int offset = skb_transport_offset(skb); |
| 1054 | int len = skb->len - offset; |
| 1055 | |
| 1056 | /* |
| 1057 | * Create a UDP header |
| 1058 | */ |
| 1059 | uh = udp_hdr(skb); |
| 1060 | uh->source = fl6->fl6_sport; |
| 1061 | uh->dest = fl6->fl6_dport; |
| 1062 | uh->len = htons(len); |
| 1063 | uh->check = 0; |
| 1064 | |
| 1065 | if (is_udplite) |
| 1066 | csum = udplite_csum(skb); |
| 1067 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ |
| 1068 | skb->ip_summed = CHECKSUM_NONE; |
| 1069 | goto send; |
| 1070 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
| 1071 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
| 1072 | goto send; |
| 1073 | } else |
| 1074 | csum = udp_csum(skb); |
| 1075 | |
| 1076 | /* add protocol-dependent pseudo-header */ |
| 1077 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
| 1078 | len, fl6->flowi6_proto, csum); |
| 1079 | if (uh->check == 0) |
| 1080 | uh->check = CSUM_MANGLED_0; |
| 1081 | |
| 1082 | send: |
| 1083 | err = ip6_send_skb(skb); |
| 1084 | if (err) { |
| 1085 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { |
| 1086 | UDP6_INC_STATS(sock_net(sk), |
| 1087 | UDP_MIB_SNDBUFERRORS, is_udplite); |
| 1088 | err = 0; |
| 1089 | } |
| 1090 | } else { |
| 1091 | UDP6_INC_STATS(sock_net(sk), |
| 1092 | UDP_MIB_OUTDATAGRAMS, is_udplite); |
| 1093 | } |
| 1094 | return err; |
| 1095 | } |
| 1096 | |
| 1097 | static int udp_v6_push_pending_frames(struct sock *sk) |
| 1098 | { |
| 1099 | struct sk_buff *skb; |
| 1100 | struct udp_sock *up = udp_sk(sk); |
| 1101 | struct flowi6 fl6; |
| 1102 | int err = 0; |
| 1103 | |
| 1104 | if (up->pending == AF_INET) |
| 1105 | return udp_push_pending_frames(sk); |
| 1106 | |
| 1107 | /* ip6_finish_skb will release the cork, so make a copy of |
| 1108 | * fl6 here. |
| 1109 | */ |
| 1110 | fl6 = inet_sk(sk)->cork.fl.u.ip6; |
| 1111 | |
| 1112 | skb = ip6_finish_skb(sk); |
| 1113 | if (!skb) |
| 1114 | goto out; |
| 1115 | |
| 1116 | err = udp_v6_send_skb(skb, &fl6); |
| 1117 | |
| 1118 | out: |
| 1119 | up->len = 0; |
| 1120 | up->pending = 0; |
| 1121 | return err; |
| 1122 | } |
| 1123 | |
| 1124 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
| 1125 | { |
| 1126 | struct ipv6_txoptions opt_space; |
| 1127 | struct udp_sock *up = udp_sk(sk); |
| 1128 | struct inet_sock *inet = inet_sk(sk); |
| 1129 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1130 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
| 1131 | struct in6_addr *daddr, *final_p, final; |
| 1132 | struct ipv6_txoptions *opt = NULL; |
| 1133 | struct ipv6_txoptions *opt_to_free = NULL; |
| 1134 | struct ip6_flowlabel *flowlabel = NULL; |
| 1135 | struct flowi6 fl6; |
| 1136 | struct dst_entry *dst; |
| 1137 | struct ipcm6_cookie ipc6; |
| 1138 | int addr_len = msg->msg_namelen; |
| 1139 | int ulen = len; |
| 1140 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| 1141 | int err; |
| 1142 | int connected = 0; |
| 1143 | int is_udplite = IS_UDPLITE(sk); |
| 1144 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
| 1145 | struct sockcm_cookie sockc; |
| 1146 | |
| 1147 | ipc6.hlimit = -1; |
| 1148 | ipc6.tclass = -1; |
| 1149 | ipc6.dontfrag = -1; |
| 1150 | sockc.tsflags = sk->sk_tsflags; |
| 1151 | |
| 1152 | /* destination address check */ |
| 1153 | if (sin6) { |
| 1154 | if (addr_len < offsetof(struct sockaddr, sa_data)) |
| 1155 | return -EINVAL; |
| 1156 | |
| 1157 | switch (sin6->sin6_family) { |
| 1158 | case AF_INET6: |
| 1159 | if (addr_len < SIN6_LEN_RFC2133) |
| 1160 | return -EINVAL; |
| 1161 | daddr = &sin6->sin6_addr; |
| 1162 | if (ipv6_addr_any(daddr) && |
| 1163 | ipv6_addr_v4mapped(&np->saddr)) |
| 1164 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), |
| 1165 | daddr); |
| 1166 | break; |
| 1167 | case AF_INET: |
| 1168 | goto do_udp_sendmsg; |
| 1169 | case AF_UNSPEC: |
| 1170 | msg->msg_name = sin6 = NULL; |
| 1171 | msg->msg_namelen = addr_len = 0; |
| 1172 | daddr = NULL; |
| 1173 | break; |
| 1174 | default: |
| 1175 | return -EINVAL; |
| 1176 | } |
| 1177 | } else if (!up->pending) { |
| 1178 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1179 | return -EDESTADDRREQ; |
| 1180 | daddr = &sk->sk_v6_daddr; |
| 1181 | } else |
| 1182 | daddr = NULL; |
| 1183 | |
| 1184 | if (daddr) { |
| 1185 | if (ipv6_addr_v4mapped(daddr)) { |
| 1186 | struct sockaddr_in sin; |
| 1187 | sin.sin_family = AF_INET; |
| 1188 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
| 1189 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| 1190 | msg->msg_name = &sin; |
| 1191 | msg->msg_namelen = sizeof(sin); |
| 1192 | do_udp_sendmsg: |
| 1193 | if (__ipv6_only_sock(sk)) |
| 1194 | return -ENETUNREACH; |
| 1195 | return udp_sendmsg(sk, msg, len); |
| 1196 | } |
| 1197 | } |
| 1198 | |
| 1199 | if (up->pending == AF_INET) |
| 1200 | return udp_sendmsg(sk, msg, len); |
| 1201 | |
| 1202 | /* Rough check on arithmetic overflow, |
| 1203 | better check is made in ip6_append_data(). |
| 1204 | */ |
| 1205 | if (len > INT_MAX - sizeof(struct udphdr)) |
| 1206 | return -EMSGSIZE; |
| 1207 | |
| 1208 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| 1209 | if (up->pending) { |
| 1210 | /* |
| 1211 | * There are pending frames. |
| 1212 | * The socket lock must be held while it's corked. |
| 1213 | */ |
| 1214 | lock_sock(sk); |
| 1215 | if (likely(up->pending)) { |
| 1216 | if (unlikely(up->pending != AF_INET6)) { |
| 1217 | release_sock(sk); |
| 1218 | return -EAFNOSUPPORT; |
| 1219 | } |
| 1220 | dst = NULL; |
| 1221 | goto do_append_data; |
| 1222 | } |
| 1223 | release_sock(sk); |
| 1224 | } |
| 1225 | ulen += sizeof(struct udphdr); |
| 1226 | |
| 1227 | memset(&fl6, 0, sizeof(fl6)); |
| 1228 | |
| 1229 | if (sin6) { |
| 1230 | if (sin6->sin6_port == 0) |
| 1231 | return -EINVAL; |
| 1232 | |
| 1233 | fl6.fl6_dport = sin6->sin6_port; |
| 1234 | daddr = &sin6->sin6_addr; |
| 1235 | |
| 1236 | if (np->sndflow) { |
| 1237 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 1238 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
| 1239 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
| 1240 | if (!flowlabel) |
| 1241 | return -EINVAL; |
| 1242 | } |
| 1243 | } |
| 1244 | |
| 1245 | /* |
| 1246 | * Otherwise it will be difficult to maintain |
| 1247 | * sk->sk_dst_cache. |
| 1248 | */ |
| 1249 | if (sk->sk_state == TCP_ESTABLISHED && |
| 1250 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
| 1251 | daddr = &sk->sk_v6_daddr; |
| 1252 | |
| 1253 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 1254 | sin6->sin6_scope_id && |
| 1255 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
| 1256 | fl6.flowi6_oif = sin6->sin6_scope_id; |
| 1257 | } else { |
| 1258 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1259 | return -EDESTADDRREQ; |
| 1260 | |
| 1261 | fl6.fl6_dport = inet->inet_dport; |
| 1262 | daddr = &sk->sk_v6_daddr; |
| 1263 | fl6.flowlabel = np->flow_label; |
| 1264 | connected = 1; |
| 1265 | } |
| 1266 | |
| 1267 | if (!fl6.flowi6_oif) |
| 1268 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 1269 | |
| 1270 | if (!fl6.flowi6_oif) |
| 1271 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; |
| 1272 | |
| 1273 | fl6.flowi6_mark = sk->sk_mark; |
| 1274 | fl6.flowi6_uid = sk->sk_uid; |
| 1275 | |
| 1276 | if (msg->msg_controllen) { |
| 1277 | opt = &opt_space; |
| 1278 | memset(opt, 0, sizeof(struct ipv6_txoptions)); |
| 1279 | opt->tot_len = sizeof(*opt); |
| 1280 | ipc6.opt = opt; |
| 1281 | |
| 1282 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); |
| 1283 | if (err < 0) { |
| 1284 | fl6_sock_release(flowlabel); |
| 1285 | return err; |
| 1286 | } |
| 1287 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
| 1288 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
| 1289 | if (!flowlabel) |
| 1290 | return -EINVAL; |
| 1291 | } |
| 1292 | if (!(opt->opt_nflen|opt->opt_flen)) |
| 1293 | opt = NULL; |
| 1294 | connected = 0; |
| 1295 | } |
| 1296 | if (!opt) { |
| 1297 | opt = txopt_get(np); |
| 1298 | opt_to_free = opt; |
| 1299 | } |
| 1300 | if (flowlabel) |
| 1301 | opt = fl6_merge_options(&opt_space, flowlabel, opt); |
| 1302 | opt = ipv6_fixup_options(&opt_space, opt); |
| 1303 | ipc6.opt = opt; |
| 1304 | |
| 1305 | fl6.flowi6_proto = sk->sk_protocol; |
| 1306 | if (!ipv6_addr_any(daddr)) |
| 1307 | fl6.daddr = *daddr; |
| 1308 | else |
| 1309 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
| 1310 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) |
| 1311 | fl6.saddr = np->saddr; |
| 1312 | fl6.fl6_sport = inet->inet_sport; |
| 1313 | |
| 1314 | final_p = fl6_update_dst(&fl6, opt, &final); |
| 1315 | if (final_p) |
| 1316 | connected = 0; |
| 1317 | |
| 1318 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
| 1319 | fl6.flowi6_oif = np->mcast_oif; |
| 1320 | connected = 0; |
| 1321 | } else if (!fl6.flowi6_oif) |
| 1322 | fl6.flowi6_oif = np->ucast_oif; |
| 1323 | |
| 1324 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
| 1325 | |
| 1326 | if (ipc6.tclass < 0) |
| 1327 | ipc6.tclass = np->tclass; |
| 1328 | |
| 1329 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
| 1330 | |
| 1331 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
| 1332 | if (IS_ERR(dst)) { |
| 1333 | err = PTR_ERR(dst); |
| 1334 | dst = NULL; |
| 1335 | goto out; |
| 1336 | } |
| 1337 | |
| 1338 | if (ipc6.hlimit < 0) |
| 1339 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
| 1340 | |
| 1341 | if (msg->msg_flags&MSG_CONFIRM) |
| 1342 | goto do_confirm; |
| 1343 | back_from_confirm: |
| 1344 | |
| 1345 | /* Lockless fast path for the non-corking case */ |
| 1346 | if (!corkreq) { |
| 1347 | struct sk_buff *skb; |
| 1348 | |
| 1349 | skb = ip6_make_skb(sk, getfrag, msg, ulen, |
| 1350 | sizeof(struct udphdr), &ipc6, |
| 1351 | &fl6, (struct rt6_info *)dst, |
| 1352 | msg->msg_flags, &sockc); |
| 1353 | err = PTR_ERR(skb); |
| 1354 | if (!IS_ERR_OR_NULL(skb)) |
| 1355 | err = udp_v6_send_skb(skb, &fl6); |
| 1356 | goto release_dst; |
| 1357 | } |
| 1358 | |
| 1359 | lock_sock(sk); |
| 1360 | if (unlikely(up->pending)) { |
| 1361 | /* The socket is already corked while preparing it. */ |
| 1362 | /* ... which is an evident application bug. --ANK */ |
| 1363 | release_sock(sk); |
| 1364 | |
| 1365 | net_dbg_ratelimited("udp cork app bug 2\n"); |
| 1366 | err = -EINVAL; |
| 1367 | goto out; |
| 1368 | } |
| 1369 | |
| 1370 | up->pending = AF_INET6; |
| 1371 | |
| 1372 | do_append_data: |
| 1373 | if (ipc6.dontfrag < 0) |
| 1374 | ipc6.dontfrag = np->dontfrag; |
| 1375 | up->len += ulen; |
| 1376 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
| 1377 | &ipc6, &fl6, (struct rt6_info *)dst, |
| 1378 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); |
| 1379 | if (err) |
| 1380 | udp_v6_flush_pending_frames(sk); |
| 1381 | else if (!corkreq) |
| 1382 | err = udp_v6_push_pending_frames(sk); |
| 1383 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| 1384 | up->pending = 0; |
| 1385 | |
| 1386 | if (err > 0) |
| 1387 | err = np->recverr ? net_xmit_errno(err) : 0; |
| 1388 | release_sock(sk); |
| 1389 | |
| 1390 | release_dst: |
| 1391 | if (dst) { |
| 1392 | if (connected) { |
| 1393 | ip6_dst_store(sk, dst, |
| 1394 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
| 1395 | &sk->sk_v6_daddr : NULL, |
| 1396 | #ifdef CONFIG_IPV6_SUBTREES |
| 1397 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
| 1398 | &np->saddr : |
| 1399 | #endif |
| 1400 | NULL); |
| 1401 | } else { |
| 1402 | dst_release(dst); |
| 1403 | } |
| 1404 | dst = NULL; |
| 1405 | } |
| 1406 | |
| 1407 | out: |
| 1408 | dst_release(dst); |
| 1409 | fl6_sock_release(flowlabel); |
| 1410 | txopt_put(opt_to_free); |
| 1411 | if (!err) |
| 1412 | return len; |
| 1413 | /* |
| 1414 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| 1415 | * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| 1416 | * we don't have a good statistic (IpOutDiscards but it can be too many |
| 1417 | * things). We could add another new stat but at least for now that |
| 1418 | * seems like overkill. |
| 1419 | */ |
| 1420 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
| 1421 | UDP6_INC_STATS(sock_net(sk), |
| 1422 | UDP_MIB_SNDBUFERRORS, is_udplite); |
| 1423 | } |
| 1424 | return err; |
| 1425 | |
| 1426 | do_confirm: |
| 1427 | if (msg->msg_flags & MSG_PROBE) |
| 1428 | dst_confirm_neigh(dst, &fl6.daddr); |
| 1429 | if (!(msg->msg_flags&MSG_PROBE) || len) |
| 1430 | goto back_from_confirm; |
| 1431 | err = 0; |
| 1432 | goto out; |
| 1433 | } |
| 1434 | |
| 1435 | void udpv6_destroy_sock(struct sock *sk) |
| 1436 | { |
| 1437 | struct udp_sock *up = udp_sk(sk); |
| 1438 | lock_sock(sk); |
| 1439 | udp_v6_flush_pending_frames(sk); |
| 1440 | release_sock(sk); |
| 1441 | |
| 1442 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
| 1443 | void (*encap_destroy)(struct sock *sk); |
| 1444 | encap_destroy = ACCESS_ONCE(up->encap_destroy); |
| 1445 | if (encap_destroy) |
| 1446 | encap_destroy(sk); |
| 1447 | } |
| 1448 | |
| 1449 | inet6_destroy_sock(sk); |
| 1450 | } |
| 1451 | |
| 1452 | /* |
| 1453 | * Socket option code for UDP |
| 1454 | */ |
| 1455 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
| 1456 | char __user *optval, unsigned int optlen) |
| 1457 | { |
| 1458 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1459 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1460 | udp_v6_push_pending_frames); |
| 1461 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
| 1462 | } |
| 1463 | |
| 1464 | #ifdef CONFIG_COMPAT |
| 1465 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
| 1466 | char __user *optval, unsigned int optlen) |
| 1467 | { |
| 1468 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1469 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1470 | udp_v6_push_pending_frames); |
| 1471 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
| 1472 | } |
| 1473 | #endif |
| 1474 | |
| 1475 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
| 1476 | char __user *optval, int __user *optlen) |
| 1477 | { |
| 1478 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1479 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 1480 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
| 1481 | } |
| 1482 | |
| 1483 | #ifdef CONFIG_COMPAT |
| 1484 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
| 1485 | char __user *optval, int __user *optlen) |
| 1486 | { |
| 1487 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1488 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 1489 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
| 1490 | } |
| 1491 | #endif |
| 1492 | |
| 1493 | /* thinking of making this const? Don't. |
| 1494 | * early_demux can change based on sysctl. |
| 1495 | */ |
| 1496 | static struct inet6_protocol udpv6_protocol = { |
| 1497 | .early_demux = udp_v6_early_demux, |
| 1498 | .early_demux_handler = udp_v6_early_demux, |
| 1499 | .handler = udpv6_rcv, |
| 1500 | .err_handler = udpv6_err, |
| 1501 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 1502 | }; |
| 1503 | |
| 1504 | /* ------------------------------------------------------------------------ */ |
| 1505 | #ifdef CONFIG_PROC_FS |
| 1506 | int udp6_seq_show(struct seq_file *seq, void *v) |
| 1507 | { |
| 1508 | if (v == SEQ_START_TOKEN) { |
| 1509 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); |
| 1510 | } else { |
| 1511 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; |
| 1512 | struct inet_sock *inet = inet_sk(v); |
| 1513 | __u16 srcp = ntohs(inet->inet_sport); |
| 1514 | __u16 destp = ntohs(inet->inet_dport); |
| 1515 | __ip6_dgram_sock_seq_show(seq, v, srcp, destp, |
| 1516 | udp_rqueue_get(v), bucket); |
| 1517 | } |
| 1518 | return 0; |
| 1519 | } |
| 1520 | |
| 1521 | static const struct file_operations udp6_afinfo_seq_fops = { |
| 1522 | .owner = THIS_MODULE, |
| 1523 | .open = udp_seq_open, |
| 1524 | .read = seq_read, |
| 1525 | .llseek = seq_lseek, |
| 1526 | .release = seq_release_net |
| 1527 | }; |
| 1528 | |
| 1529 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
| 1530 | .name = "udp6", |
| 1531 | .family = AF_INET6, |
| 1532 | .udp_table = &udp_table, |
| 1533 | .seq_fops = &udp6_afinfo_seq_fops, |
| 1534 | .seq_ops = { |
| 1535 | .show = udp6_seq_show, |
| 1536 | }, |
| 1537 | }; |
| 1538 | |
| 1539 | int __net_init udp6_proc_init(struct net *net) |
| 1540 | { |
| 1541 | return udp_proc_register(net, &udp6_seq_afinfo); |
| 1542 | } |
| 1543 | |
| 1544 | void udp6_proc_exit(struct net *net) |
| 1545 | { |
| 1546 | udp_proc_unregister(net, &udp6_seq_afinfo); |
| 1547 | } |
| 1548 | #endif /* CONFIG_PROC_FS */ |
| 1549 | |
| 1550 | /* ------------------------------------------------------------------------ */ |
| 1551 | |
| 1552 | struct proto udpv6_prot = { |
| 1553 | .name = "UDPv6", |
| 1554 | .owner = THIS_MODULE, |
| 1555 | .close = udp_lib_close, |
| 1556 | .connect = ip6_datagram_connect, |
| 1557 | .disconnect = udp_disconnect, |
| 1558 | .ioctl = udp_ioctl, |
| 1559 | .init = udp_init_sock, |
| 1560 | .destroy = udpv6_destroy_sock, |
| 1561 | .setsockopt = udpv6_setsockopt, |
| 1562 | .getsockopt = udpv6_getsockopt, |
| 1563 | .sendmsg = udpv6_sendmsg, |
| 1564 | .recvmsg = udpv6_recvmsg, |
| 1565 | .release_cb = ip6_datagram_release_cb, |
| 1566 | .hash = udp_lib_hash, |
| 1567 | .unhash = udp_lib_unhash, |
| 1568 | .rehash = udp_v6_rehash, |
| 1569 | .get_port = udp_v6_get_port, |
| 1570 | .memory_allocated = &udp_memory_allocated, |
| 1571 | .sysctl_mem = sysctl_udp_mem, |
| 1572 | .sysctl_wmem = &sysctl_udp_wmem_min, |
| 1573 | .sysctl_rmem = &sysctl_udp_rmem_min, |
| 1574 | .obj_size = sizeof(struct udp6_sock), |
| 1575 | .h.udp_table = &udp_table, |
| 1576 | #ifdef CONFIG_COMPAT |
| 1577 | .compat_setsockopt = compat_udpv6_setsockopt, |
| 1578 | .compat_getsockopt = compat_udpv6_getsockopt, |
| 1579 | #endif |
| 1580 | .diag_destroy = udp_abort, |
| 1581 | }; |
| 1582 | |
| 1583 | static struct inet_protosw udpv6_protosw = { |
| 1584 | .type = SOCK_DGRAM, |
| 1585 | .protocol = IPPROTO_UDP, |
| 1586 | .prot = &udpv6_prot, |
| 1587 | .ops = &inet6_dgram_ops, |
| 1588 | .flags = INET_PROTOSW_PERMANENT, |
| 1589 | }; |
| 1590 | |
| 1591 | int __init udpv6_init(void) |
| 1592 | { |
| 1593 | int ret; |
| 1594 | |
| 1595 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
| 1596 | if (ret) |
| 1597 | goto out; |
| 1598 | |
| 1599 | ret = inet6_register_protosw(&udpv6_protosw); |
| 1600 | if (ret) |
| 1601 | goto out_udpv6_protocol; |
| 1602 | out: |
| 1603 | return ret; |
| 1604 | |
| 1605 | out_udpv6_protocol: |
| 1606 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| 1607 | goto out; |
| 1608 | } |
| 1609 | |
| 1610 | void udpv6_exit(void) |
| 1611 | { |
| 1612 | inet6_unregister_protosw(&udpv6_protosw); |
| 1613 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| 1614 | } |