| 1 | /* |
| 2 | * net/dccp/proto.c |
| 3 | * |
| 4 | * An implementation of the DCCP protocol |
| 5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/dccp.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/netdevice.h> |
| 19 | #include <linux/in.h> |
| 20 | #include <linux/if_arp.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/random.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <net/checksum.h> |
| 25 | |
| 26 | #include <net/inet_sock.h> |
| 27 | #include <net/sock.h> |
| 28 | #include <net/xfrm.h> |
| 29 | |
| 30 | #include <asm/ioctls.h> |
| 31 | #include <linux/spinlock.h> |
| 32 | #include <linux/timer.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/poll.h> |
| 35 | |
| 36 | #include "ccid.h" |
| 37 | #include "dccp.h" |
| 38 | #include "feat.h" |
| 39 | |
| 40 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
| 41 | |
| 42 | EXPORT_SYMBOL_GPL(dccp_statistics); |
| 43 | |
| 44 | struct percpu_counter dccp_orphan_count; |
| 45 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
| 46 | |
| 47 | struct inet_hashinfo dccp_hashinfo; |
| 48 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
| 49 | |
| 50 | /* the maximum queue length for tx in packets. 0 is no limit */ |
| 51 | int sysctl_dccp_tx_qlen __read_mostly = 5; |
| 52 | |
| 53 | #ifdef CONFIG_IP_DCCP_DEBUG |
| 54 | static const char *dccp_state_name(const int state) |
| 55 | { |
| 56 | static const char *const dccp_state_names[] = { |
| 57 | [DCCP_OPEN] = "OPEN", |
| 58 | [DCCP_REQUESTING] = "REQUESTING", |
| 59 | [DCCP_PARTOPEN] = "PARTOPEN", |
| 60 | [DCCP_LISTEN] = "LISTEN", |
| 61 | [DCCP_RESPOND] = "RESPOND", |
| 62 | [DCCP_CLOSING] = "CLOSING", |
| 63 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", |
| 64 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", |
| 65 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", |
| 66 | [DCCP_TIME_WAIT] = "TIME_WAIT", |
| 67 | [DCCP_CLOSED] = "CLOSED", |
| 68 | }; |
| 69 | |
| 70 | if (state >= DCCP_MAX_STATES) |
| 71 | return "INVALID STATE!"; |
| 72 | else |
| 73 | return dccp_state_names[state]; |
| 74 | } |
| 75 | #endif |
| 76 | |
| 77 | void dccp_set_state(struct sock *sk, const int state) |
| 78 | { |
| 79 | const int oldstate = sk->sk_state; |
| 80 | |
| 81 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
| 82 | dccp_state_name(oldstate), dccp_state_name(state)); |
| 83 | WARN_ON(state == oldstate); |
| 84 | |
| 85 | switch (state) { |
| 86 | case DCCP_OPEN: |
| 87 | if (oldstate != DCCP_OPEN) |
| 88 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); |
| 89 | /* Client retransmits all Confirm options until entering OPEN */ |
| 90 | if (oldstate == DCCP_PARTOPEN) |
| 91 | dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); |
| 92 | break; |
| 93 | |
| 94 | case DCCP_CLOSED: |
| 95 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
| 96 | oldstate == DCCP_CLOSING) |
| 97 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
| 98 | |
| 99 | sk->sk_prot->unhash(sk); |
| 100 | if (inet_csk(sk)->icsk_bind_hash != NULL && |
| 101 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) |
| 102 | inet_put_port(sk); |
| 103 | /* fall through */ |
| 104 | default: |
| 105 | if (oldstate == DCCP_OPEN) |
| 106 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); |
| 107 | } |
| 108 | |
| 109 | /* Change state AFTER socket is unhashed to avoid closed |
| 110 | * socket sitting in hash tables. |
| 111 | */ |
| 112 | sk->sk_state = state; |
| 113 | } |
| 114 | |
| 115 | EXPORT_SYMBOL_GPL(dccp_set_state); |
| 116 | |
| 117 | static void dccp_finish_passive_close(struct sock *sk) |
| 118 | { |
| 119 | switch (sk->sk_state) { |
| 120 | case DCCP_PASSIVE_CLOSE: |
| 121 | /* Node (client or server) has received Close packet. */ |
| 122 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); |
| 123 | dccp_set_state(sk, DCCP_CLOSED); |
| 124 | break; |
| 125 | case DCCP_PASSIVE_CLOSEREQ: |
| 126 | /* |
| 127 | * Client received CloseReq. We set the `active' flag so that |
| 128 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. |
| 129 | */ |
| 130 | dccp_send_close(sk, 1); |
| 131 | dccp_set_state(sk, DCCP_CLOSING); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | void dccp_done(struct sock *sk) |
| 136 | { |
| 137 | dccp_set_state(sk, DCCP_CLOSED); |
| 138 | dccp_clear_xmit_timers(sk); |
| 139 | |
| 140 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 141 | |
| 142 | if (!sock_flag(sk, SOCK_DEAD)) |
| 143 | sk->sk_state_change(sk); |
| 144 | else |
| 145 | inet_csk_destroy_sock(sk); |
| 146 | } |
| 147 | |
| 148 | EXPORT_SYMBOL_GPL(dccp_done); |
| 149 | |
| 150 | const char *dccp_packet_name(const int type) |
| 151 | { |
| 152 | static const char *const dccp_packet_names[] = { |
| 153 | [DCCP_PKT_REQUEST] = "REQUEST", |
| 154 | [DCCP_PKT_RESPONSE] = "RESPONSE", |
| 155 | [DCCP_PKT_DATA] = "DATA", |
| 156 | [DCCP_PKT_ACK] = "ACK", |
| 157 | [DCCP_PKT_DATAACK] = "DATAACK", |
| 158 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", |
| 159 | [DCCP_PKT_CLOSE] = "CLOSE", |
| 160 | [DCCP_PKT_RESET] = "RESET", |
| 161 | [DCCP_PKT_SYNC] = "SYNC", |
| 162 | [DCCP_PKT_SYNCACK] = "SYNCACK", |
| 163 | }; |
| 164 | |
| 165 | if (type >= DCCP_NR_PKT_TYPES) |
| 166 | return "INVALID"; |
| 167 | else |
| 168 | return dccp_packet_names[type]; |
| 169 | } |
| 170 | |
| 171 | EXPORT_SYMBOL_GPL(dccp_packet_name); |
| 172 | |
| 173 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
| 174 | { |
| 175 | struct dccp_sock *dp = dccp_sk(sk); |
| 176 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 177 | |
| 178 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
| 179 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; |
| 180 | sk->sk_state = DCCP_CLOSED; |
| 181 | sk->sk_write_space = dccp_write_space; |
| 182 | icsk->icsk_sync_mss = dccp_sync_mss; |
| 183 | dp->dccps_mss_cache = 536; |
| 184 | dp->dccps_rate_last = jiffies; |
| 185 | dp->dccps_role = DCCP_ROLE_UNDEFINED; |
| 186 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; |
| 187 | dp->dccps_tx_qlen = sysctl_dccp_tx_qlen; |
| 188 | |
| 189 | dccp_init_xmit_timers(sk); |
| 190 | |
| 191 | INIT_LIST_HEAD(&dp->dccps_featneg); |
| 192 | /* control socket doesn't need feat nego */ |
| 193 | if (likely(ctl_sock_initialized)) |
| 194 | return dccp_feat_init(sk); |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | EXPORT_SYMBOL_GPL(dccp_init_sock); |
| 199 | |
| 200 | void dccp_destroy_sock(struct sock *sk) |
| 201 | { |
| 202 | struct dccp_sock *dp = dccp_sk(sk); |
| 203 | |
| 204 | /* |
| 205 | * DCCP doesn't use sk_write_queue, just sk_send_head |
| 206 | * for retransmissions |
| 207 | */ |
| 208 | if (sk->sk_send_head != NULL) { |
| 209 | kfree_skb(sk->sk_send_head); |
| 210 | sk->sk_send_head = NULL; |
| 211 | } |
| 212 | |
| 213 | /* Clean up a referenced DCCP bind bucket. */ |
| 214 | if (inet_csk(sk)->icsk_bind_hash != NULL) |
| 215 | inet_put_port(sk); |
| 216 | |
| 217 | kfree(dp->dccps_service_list); |
| 218 | dp->dccps_service_list = NULL; |
| 219 | |
| 220 | if (dp->dccps_hc_rx_ackvec != NULL) { |
| 221 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
| 222 | dp->dccps_hc_rx_ackvec = NULL; |
| 223 | } |
| 224 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
| 225 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); |
| 226 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; |
| 227 | |
| 228 | /* clean up feature negotiation state */ |
| 229 | dccp_feat_list_purge(&dp->dccps_featneg); |
| 230 | } |
| 231 | |
| 232 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); |
| 233 | |
| 234 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
| 235 | { |
| 236 | struct dccp_sock *dp = dccp_sk(sk); |
| 237 | |
| 238 | dp->dccps_role = DCCP_ROLE_LISTEN; |
| 239 | /* do not start to listen if feature negotiation setup fails */ |
| 240 | if (dccp_feat_finalise_settings(dp)) |
| 241 | return -EPROTO; |
| 242 | return inet_csk_listen_start(sk, backlog); |
| 243 | } |
| 244 | |
| 245 | static inline int dccp_need_reset(int state) |
| 246 | { |
| 247 | return state != DCCP_CLOSED && state != DCCP_LISTEN && |
| 248 | state != DCCP_REQUESTING; |
| 249 | } |
| 250 | |
| 251 | int dccp_disconnect(struct sock *sk, int flags) |
| 252 | { |
| 253 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 254 | struct inet_sock *inet = inet_sk(sk); |
| 255 | int err = 0; |
| 256 | const int old_state = sk->sk_state; |
| 257 | |
| 258 | if (old_state != DCCP_CLOSED) |
| 259 | dccp_set_state(sk, DCCP_CLOSED); |
| 260 | |
| 261 | /* |
| 262 | * This corresponds to the ABORT function of RFC793, sec. 3.8 |
| 263 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". |
| 264 | */ |
| 265 | if (old_state == DCCP_LISTEN) { |
| 266 | inet_csk_listen_stop(sk); |
| 267 | } else if (dccp_need_reset(old_state)) { |
| 268 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 269 | sk->sk_err = ECONNRESET; |
| 270 | } else if (old_state == DCCP_REQUESTING) |
| 271 | sk->sk_err = ECONNRESET; |
| 272 | |
| 273 | dccp_clear_xmit_timers(sk); |
| 274 | |
| 275 | __skb_queue_purge(&sk->sk_receive_queue); |
| 276 | __skb_queue_purge(&sk->sk_write_queue); |
| 277 | if (sk->sk_send_head != NULL) { |
| 278 | __kfree_skb(sk->sk_send_head); |
| 279 | sk->sk_send_head = NULL; |
| 280 | } |
| 281 | |
| 282 | inet->inet_dport = 0; |
| 283 | |
| 284 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 285 | inet_reset_saddr(sk); |
| 286 | |
| 287 | sk->sk_shutdown = 0; |
| 288 | sock_reset_flag(sk, SOCK_DONE); |
| 289 | |
| 290 | icsk->icsk_backoff = 0; |
| 291 | inet_csk_delack_init(sk); |
| 292 | __sk_dst_reset(sk); |
| 293 | |
| 294 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
| 295 | |
| 296 | sk->sk_error_report(sk); |
| 297 | return err; |
| 298 | } |
| 299 | |
| 300 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
| 301 | |
| 302 | /* |
| 303 | * Wait for a DCCP event. |
| 304 | * |
| 305 | * Note that we don't need to lock the socket, as the upper poll layers |
| 306 | * take care of normal races (between the test and the event) and we don't |
| 307 | * go look at any of the socket buffers directly. |
| 308 | */ |
| 309 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
| 310 | poll_table *wait) |
| 311 | { |
| 312 | unsigned int mask; |
| 313 | struct sock *sk = sock->sk; |
| 314 | |
| 315 | sock_poll_wait(file, sk_sleep(sk), wait); |
| 316 | if (sk->sk_state == DCCP_LISTEN) |
| 317 | return inet_csk_listen_poll(sk); |
| 318 | |
| 319 | /* Socket is not locked. We are protected from async events |
| 320 | by poll logic and correct handling of state changes |
| 321 | made by another threads is impossible in any case. |
| 322 | */ |
| 323 | |
| 324 | mask = 0; |
| 325 | if (sk->sk_err) |
| 326 | mask = POLLERR; |
| 327 | |
| 328 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) |
| 329 | mask |= POLLHUP; |
| 330 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 331 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
| 332 | |
| 333 | /* Connected? */ |
| 334 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { |
| 335 | if (atomic_read(&sk->sk_rmem_alloc) > 0) |
| 336 | mask |= POLLIN | POLLRDNORM; |
| 337 | |
| 338 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 339 | if (sk_stream_is_writeable(sk)) { |
| 340 | mask |= POLLOUT | POLLWRNORM; |
| 341 | } else { /* send SIGIO later */ |
| 342 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
| 343 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 344 | |
| 345 | /* Race breaker. If space is freed after |
| 346 | * wspace test but before the flags are set, |
| 347 | * IO signal will be lost. |
| 348 | */ |
| 349 | if (sk_stream_is_writeable(sk)) |
| 350 | mask |= POLLOUT | POLLWRNORM; |
| 351 | } |
| 352 | } |
| 353 | } |
| 354 | return mask; |
| 355 | } |
| 356 | |
| 357 | EXPORT_SYMBOL_GPL(dccp_poll); |
| 358 | |
| 359 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 360 | { |
| 361 | int rc = -ENOTCONN; |
| 362 | |
| 363 | lock_sock(sk); |
| 364 | |
| 365 | if (sk->sk_state == DCCP_LISTEN) |
| 366 | goto out; |
| 367 | |
| 368 | switch (cmd) { |
| 369 | case SIOCINQ: { |
| 370 | struct sk_buff *skb; |
| 371 | unsigned long amount = 0; |
| 372 | |
| 373 | skb = skb_peek(&sk->sk_receive_queue); |
| 374 | if (skb != NULL) { |
| 375 | /* |
| 376 | * We will only return the amount of this packet since |
| 377 | * that is all that will be read. |
| 378 | */ |
| 379 | amount = skb->len; |
| 380 | } |
| 381 | rc = put_user(amount, (int __user *)arg); |
| 382 | } |
| 383 | break; |
| 384 | default: |
| 385 | rc = -ENOIOCTLCMD; |
| 386 | break; |
| 387 | } |
| 388 | out: |
| 389 | release_sock(sk); |
| 390 | return rc; |
| 391 | } |
| 392 | |
| 393 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
| 394 | |
| 395 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
| 396 | char __user *optval, unsigned int optlen) |
| 397 | { |
| 398 | struct dccp_sock *dp = dccp_sk(sk); |
| 399 | struct dccp_service_list *sl = NULL; |
| 400 | |
| 401 | if (service == DCCP_SERVICE_INVALID_VALUE || |
| 402 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
| 403 | return -EINVAL; |
| 404 | |
| 405 | if (optlen > sizeof(service)) { |
| 406 | sl = kmalloc(optlen, GFP_KERNEL); |
| 407 | if (sl == NULL) |
| 408 | return -ENOMEM; |
| 409 | |
| 410 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; |
| 411 | if (copy_from_user(sl->dccpsl_list, |
| 412 | optval + sizeof(service), |
| 413 | optlen - sizeof(service)) || |
| 414 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { |
| 415 | kfree(sl); |
| 416 | return -EFAULT; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | lock_sock(sk); |
| 421 | dp->dccps_service = service; |
| 422 | |
| 423 | kfree(dp->dccps_service_list); |
| 424 | |
| 425 | dp->dccps_service_list = sl; |
| 426 | release_sock(sk); |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
| 431 | { |
| 432 | u8 *list, len; |
| 433 | int i, rc; |
| 434 | |
| 435 | if (cscov < 0 || cscov > 15) |
| 436 | return -EINVAL; |
| 437 | /* |
| 438 | * Populate a list of permissible values, in the range cscov...15. This |
| 439 | * is necessary since feature negotiation of single values only works if |
| 440 | * both sides incidentally choose the same value. Since the list starts |
| 441 | * lowest-value first, negotiation will pick the smallest shared value. |
| 442 | */ |
| 443 | if (cscov == 0) |
| 444 | return 0; |
| 445 | len = 16 - cscov; |
| 446 | |
| 447 | list = kmalloc(len, GFP_KERNEL); |
| 448 | if (list == NULL) |
| 449 | return -ENOBUFS; |
| 450 | |
| 451 | for (i = 0; i < len; i++) |
| 452 | list[i] = cscov++; |
| 453 | |
| 454 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); |
| 455 | |
| 456 | if (rc == 0) { |
| 457 | if (rx) |
| 458 | dccp_sk(sk)->dccps_pcrlen = cscov; |
| 459 | else |
| 460 | dccp_sk(sk)->dccps_pcslen = cscov; |
| 461 | } |
| 462 | kfree(list); |
| 463 | return rc; |
| 464 | } |
| 465 | |
| 466 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
| 467 | char __user *optval, unsigned int optlen) |
| 468 | { |
| 469 | u8 *val; |
| 470 | int rc = 0; |
| 471 | |
| 472 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) |
| 473 | return -EINVAL; |
| 474 | |
| 475 | val = memdup_user(optval, optlen); |
| 476 | if (IS_ERR(val)) |
| 477 | return PTR_ERR(val); |
| 478 | |
| 479 | lock_sock(sk); |
| 480 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) |
| 481 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); |
| 482 | |
| 483 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) |
| 484 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); |
| 485 | release_sock(sk); |
| 486 | |
| 487 | kfree(val); |
| 488 | return rc; |
| 489 | } |
| 490 | |
| 491 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
| 492 | char __user *optval, unsigned int optlen) |
| 493 | { |
| 494 | struct dccp_sock *dp = dccp_sk(sk); |
| 495 | int val, err = 0; |
| 496 | |
| 497 | switch (optname) { |
| 498 | case DCCP_SOCKOPT_PACKET_SIZE: |
| 499 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
| 500 | return 0; |
| 501 | case DCCP_SOCKOPT_CHANGE_L: |
| 502 | case DCCP_SOCKOPT_CHANGE_R: |
| 503 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); |
| 504 | return 0; |
| 505 | case DCCP_SOCKOPT_CCID: |
| 506 | case DCCP_SOCKOPT_RX_CCID: |
| 507 | case DCCP_SOCKOPT_TX_CCID: |
| 508 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); |
| 509 | } |
| 510 | |
| 511 | if (optlen < (int)sizeof(int)) |
| 512 | return -EINVAL; |
| 513 | |
| 514 | if (get_user(val, (int __user *)optval)) |
| 515 | return -EFAULT; |
| 516 | |
| 517 | if (optname == DCCP_SOCKOPT_SERVICE) |
| 518 | return dccp_setsockopt_service(sk, val, optval, optlen); |
| 519 | |
| 520 | lock_sock(sk); |
| 521 | switch (optname) { |
| 522 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
| 523 | if (dp->dccps_role != DCCP_ROLE_SERVER) |
| 524 | err = -EOPNOTSUPP; |
| 525 | else |
| 526 | dp->dccps_server_timewait = (val != 0); |
| 527 | break; |
| 528 | case DCCP_SOCKOPT_SEND_CSCOV: |
| 529 | err = dccp_setsockopt_cscov(sk, val, false); |
| 530 | break; |
| 531 | case DCCP_SOCKOPT_RECV_CSCOV: |
| 532 | err = dccp_setsockopt_cscov(sk, val, true); |
| 533 | break; |
| 534 | case DCCP_SOCKOPT_QPOLICY_ID: |
| 535 | if (sk->sk_state != DCCP_CLOSED) |
| 536 | err = -EISCONN; |
| 537 | else if (val < 0 || val >= DCCPQ_POLICY_MAX) |
| 538 | err = -EINVAL; |
| 539 | else |
| 540 | dp->dccps_qpolicy = val; |
| 541 | break; |
| 542 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: |
| 543 | if (val < 0) |
| 544 | err = -EINVAL; |
| 545 | else |
| 546 | dp->dccps_tx_qlen = val; |
| 547 | break; |
| 548 | default: |
| 549 | err = -ENOPROTOOPT; |
| 550 | break; |
| 551 | } |
| 552 | release_sock(sk); |
| 553 | |
| 554 | return err; |
| 555 | } |
| 556 | |
| 557 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
| 558 | char __user *optval, unsigned int optlen) |
| 559 | { |
| 560 | if (level != SOL_DCCP) |
| 561 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, |
| 562 | optname, optval, |
| 563 | optlen); |
| 564 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 565 | } |
| 566 | |
| 567 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
| 568 | |
| 569 | #ifdef CONFIG_COMPAT |
| 570 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, |
| 571 | char __user *optval, unsigned int optlen) |
| 572 | { |
| 573 | if (level != SOL_DCCP) |
| 574 | return inet_csk_compat_setsockopt(sk, level, optname, |
| 575 | optval, optlen); |
| 576 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 577 | } |
| 578 | |
| 579 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
| 580 | #endif |
| 581 | |
| 582 | static int dccp_getsockopt_service(struct sock *sk, int len, |
| 583 | __be32 __user *optval, |
| 584 | int __user *optlen) |
| 585 | { |
| 586 | const struct dccp_sock *dp = dccp_sk(sk); |
| 587 | const struct dccp_service_list *sl; |
| 588 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); |
| 589 | |
| 590 | lock_sock(sk); |
| 591 | if ((sl = dp->dccps_service_list) != NULL) { |
| 592 | slen = sl->dccpsl_nr * sizeof(u32); |
| 593 | total_len += slen; |
| 594 | } |
| 595 | |
| 596 | err = -EINVAL; |
| 597 | if (total_len > len) |
| 598 | goto out; |
| 599 | |
| 600 | err = 0; |
| 601 | if (put_user(total_len, optlen) || |
| 602 | put_user(dp->dccps_service, optval) || |
| 603 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) |
| 604 | err = -EFAULT; |
| 605 | out: |
| 606 | release_sock(sk); |
| 607 | return err; |
| 608 | } |
| 609 | |
| 610 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
| 611 | char __user *optval, int __user *optlen) |
| 612 | { |
| 613 | struct dccp_sock *dp; |
| 614 | int val, len; |
| 615 | |
| 616 | if (get_user(len, optlen)) |
| 617 | return -EFAULT; |
| 618 | |
| 619 | if (len < (int)sizeof(int)) |
| 620 | return -EINVAL; |
| 621 | |
| 622 | dp = dccp_sk(sk); |
| 623 | |
| 624 | switch (optname) { |
| 625 | case DCCP_SOCKOPT_PACKET_SIZE: |
| 626 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
| 627 | return 0; |
| 628 | case DCCP_SOCKOPT_SERVICE: |
| 629 | return dccp_getsockopt_service(sk, len, |
| 630 | (__be32 __user *)optval, optlen); |
| 631 | case DCCP_SOCKOPT_GET_CUR_MPS: |
| 632 | val = dp->dccps_mss_cache; |
| 633 | break; |
| 634 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
| 635 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); |
| 636 | case DCCP_SOCKOPT_TX_CCID: |
| 637 | val = ccid_get_current_tx_ccid(dp); |
| 638 | if (val < 0) |
| 639 | return -ENOPROTOOPT; |
| 640 | break; |
| 641 | case DCCP_SOCKOPT_RX_CCID: |
| 642 | val = ccid_get_current_rx_ccid(dp); |
| 643 | if (val < 0) |
| 644 | return -ENOPROTOOPT; |
| 645 | break; |
| 646 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
| 647 | val = dp->dccps_server_timewait; |
| 648 | break; |
| 649 | case DCCP_SOCKOPT_SEND_CSCOV: |
| 650 | val = dp->dccps_pcslen; |
| 651 | break; |
| 652 | case DCCP_SOCKOPT_RECV_CSCOV: |
| 653 | val = dp->dccps_pcrlen; |
| 654 | break; |
| 655 | case DCCP_SOCKOPT_QPOLICY_ID: |
| 656 | val = dp->dccps_qpolicy; |
| 657 | break; |
| 658 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: |
| 659 | val = dp->dccps_tx_qlen; |
| 660 | break; |
| 661 | case 128 ... 191: |
| 662 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, |
| 663 | len, (u32 __user *)optval, optlen); |
| 664 | case 192 ... 255: |
| 665 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, |
| 666 | len, (u32 __user *)optval, optlen); |
| 667 | default: |
| 668 | return -ENOPROTOOPT; |
| 669 | } |
| 670 | |
| 671 | len = sizeof(val); |
| 672 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
| 673 | return -EFAULT; |
| 674 | |
| 675 | return 0; |
| 676 | } |
| 677 | |
| 678 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
| 679 | char __user *optval, int __user *optlen) |
| 680 | { |
| 681 | if (level != SOL_DCCP) |
| 682 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, |
| 683 | optname, optval, |
| 684 | optlen); |
| 685 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 686 | } |
| 687 | |
| 688 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
| 689 | |
| 690 | #ifdef CONFIG_COMPAT |
| 691 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, |
| 692 | char __user *optval, int __user *optlen) |
| 693 | { |
| 694 | if (level != SOL_DCCP) |
| 695 | return inet_csk_compat_getsockopt(sk, level, optname, |
| 696 | optval, optlen); |
| 697 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 698 | } |
| 699 | |
| 700 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
| 701 | #endif |
| 702 | |
| 703 | static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb) |
| 704 | { |
| 705 | struct cmsghdr *cmsg; |
| 706 | |
| 707 | /* |
| 708 | * Assign an (opaque) qpolicy priority value to skb->priority. |
| 709 | * |
| 710 | * We are overloading this skb field for use with the qpolicy subystem. |
| 711 | * The skb->priority is normally used for the SO_PRIORITY option, which |
| 712 | * is initialised from sk_priority. Since the assignment of sk_priority |
| 713 | * to skb->priority happens later (on layer 3), we overload this field |
| 714 | * for use with queueing priorities as long as the skb is on layer 4. |
| 715 | * The default priority value (if nothing is set) is 0. |
| 716 | */ |
| 717 | skb->priority = 0; |
| 718 | |
| 719 | for_each_cmsghdr(cmsg, msg) { |
| 720 | if (!CMSG_OK(msg, cmsg)) |
| 721 | return -EINVAL; |
| 722 | |
| 723 | if (cmsg->cmsg_level != SOL_DCCP) |
| 724 | continue; |
| 725 | |
| 726 | if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX && |
| 727 | !dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type)) |
| 728 | return -EINVAL; |
| 729 | |
| 730 | switch (cmsg->cmsg_type) { |
| 731 | case DCCP_SCM_PRIORITY: |
| 732 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32))) |
| 733 | return -EINVAL; |
| 734 | skb->priority = *(__u32 *)CMSG_DATA(cmsg); |
| 735 | break; |
| 736 | default: |
| 737 | return -EINVAL; |
| 738 | } |
| 739 | } |
| 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
| 744 | { |
| 745 | const struct dccp_sock *dp = dccp_sk(sk); |
| 746 | const int flags = msg->msg_flags; |
| 747 | const int noblock = flags & MSG_DONTWAIT; |
| 748 | struct sk_buff *skb; |
| 749 | int rc, size; |
| 750 | long timeo; |
| 751 | |
| 752 | if (len > dp->dccps_mss_cache) |
| 753 | return -EMSGSIZE; |
| 754 | |
| 755 | lock_sock(sk); |
| 756 | |
| 757 | if (dccp_qpolicy_full(sk)) { |
| 758 | rc = -EAGAIN; |
| 759 | goto out_release; |
| 760 | } |
| 761 | |
| 762 | timeo = sock_sndtimeo(sk, noblock); |
| 763 | |
| 764 | /* |
| 765 | * We have to use sk_stream_wait_connect here to set sk_write_pending, |
| 766 | * so that the trick in dccp_rcv_request_sent_state_process. |
| 767 | */ |
| 768 | /* Wait for a connection to finish. */ |
| 769 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
| 770 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
| 771 | goto out_release; |
| 772 | |
| 773 | size = sk->sk_prot->max_header + len; |
| 774 | release_sock(sk); |
| 775 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
| 776 | lock_sock(sk); |
| 777 | if (skb == NULL) |
| 778 | goto out_release; |
| 779 | |
| 780 | skb_reserve(skb, sk->sk_prot->max_header); |
| 781 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
| 782 | if (rc != 0) |
| 783 | goto out_discard; |
| 784 | |
| 785 | rc = dccp_msghdr_parse(msg, skb); |
| 786 | if (rc != 0) |
| 787 | goto out_discard; |
| 788 | |
| 789 | dccp_qpolicy_push(sk, skb); |
| 790 | /* |
| 791 | * The xmit_timer is set if the TX CCID is rate-based and will expire |
| 792 | * when congestion control permits to release further packets into the |
| 793 | * network. Window-based CCIDs do not use this timer. |
| 794 | */ |
| 795 | if (!timer_pending(&dp->dccps_xmit_timer)) |
| 796 | dccp_write_xmit(sk); |
| 797 | out_release: |
| 798 | release_sock(sk); |
| 799 | return rc ? : len; |
| 800 | out_discard: |
| 801 | kfree_skb(skb); |
| 802 | goto out_release; |
| 803 | } |
| 804 | |
| 805 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
| 806 | |
| 807 | int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, |
| 808 | int flags, int *addr_len) |
| 809 | { |
| 810 | const struct dccp_hdr *dh; |
| 811 | long timeo; |
| 812 | |
| 813 | lock_sock(sk); |
| 814 | |
| 815 | if (sk->sk_state == DCCP_LISTEN) { |
| 816 | len = -ENOTCONN; |
| 817 | goto out; |
| 818 | } |
| 819 | |
| 820 | timeo = sock_rcvtimeo(sk, nonblock); |
| 821 | |
| 822 | do { |
| 823 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
| 824 | |
| 825 | if (skb == NULL) |
| 826 | goto verify_sock_status; |
| 827 | |
| 828 | dh = dccp_hdr(skb); |
| 829 | |
| 830 | switch (dh->dccph_type) { |
| 831 | case DCCP_PKT_DATA: |
| 832 | case DCCP_PKT_DATAACK: |
| 833 | goto found_ok_skb; |
| 834 | |
| 835 | case DCCP_PKT_CLOSE: |
| 836 | case DCCP_PKT_CLOSEREQ: |
| 837 | if (!(flags & MSG_PEEK)) |
| 838 | dccp_finish_passive_close(sk); |
| 839 | /* fall through */ |
| 840 | case DCCP_PKT_RESET: |
| 841 | dccp_pr_debug("found fin (%s) ok!\n", |
| 842 | dccp_packet_name(dh->dccph_type)); |
| 843 | len = 0; |
| 844 | goto found_fin_ok; |
| 845 | default: |
| 846 | dccp_pr_debug("packet_type=%s\n", |
| 847 | dccp_packet_name(dh->dccph_type)); |
| 848 | sk_eat_skb(sk, skb); |
| 849 | } |
| 850 | verify_sock_status: |
| 851 | if (sock_flag(sk, SOCK_DONE)) { |
| 852 | len = 0; |
| 853 | break; |
| 854 | } |
| 855 | |
| 856 | if (sk->sk_err) { |
| 857 | len = sock_error(sk); |
| 858 | break; |
| 859 | } |
| 860 | |
| 861 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
| 862 | len = 0; |
| 863 | break; |
| 864 | } |
| 865 | |
| 866 | if (sk->sk_state == DCCP_CLOSED) { |
| 867 | if (!sock_flag(sk, SOCK_DONE)) { |
| 868 | /* This occurs when user tries to read |
| 869 | * from never connected socket. |
| 870 | */ |
| 871 | len = -ENOTCONN; |
| 872 | break; |
| 873 | } |
| 874 | len = 0; |
| 875 | break; |
| 876 | } |
| 877 | |
| 878 | if (!timeo) { |
| 879 | len = -EAGAIN; |
| 880 | break; |
| 881 | } |
| 882 | |
| 883 | if (signal_pending(current)) { |
| 884 | len = sock_intr_errno(timeo); |
| 885 | break; |
| 886 | } |
| 887 | |
| 888 | sk_wait_data(sk, &timeo, NULL); |
| 889 | continue; |
| 890 | found_ok_skb: |
| 891 | if (len > skb->len) |
| 892 | len = skb->len; |
| 893 | else if (len < skb->len) |
| 894 | msg->msg_flags |= MSG_TRUNC; |
| 895 | |
| 896 | if (skb_copy_datagram_msg(skb, 0, msg, len)) { |
| 897 | /* Exception. Bailout! */ |
| 898 | len = -EFAULT; |
| 899 | break; |
| 900 | } |
| 901 | if (flags & MSG_TRUNC) |
| 902 | len = skb->len; |
| 903 | found_fin_ok: |
| 904 | if (!(flags & MSG_PEEK)) |
| 905 | sk_eat_skb(sk, skb); |
| 906 | break; |
| 907 | } while (1); |
| 908 | out: |
| 909 | release_sock(sk); |
| 910 | return len; |
| 911 | } |
| 912 | |
| 913 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
| 914 | |
| 915 | int inet_dccp_listen(struct socket *sock, int backlog) |
| 916 | { |
| 917 | struct sock *sk = sock->sk; |
| 918 | unsigned char old_state; |
| 919 | int err; |
| 920 | |
| 921 | lock_sock(sk); |
| 922 | |
| 923 | err = -EINVAL; |
| 924 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) |
| 925 | goto out; |
| 926 | |
| 927 | old_state = sk->sk_state; |
| 928 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) |
| 929 | goto out; |
| 930 | |
| 931 | /* Really, if the socket is already in listen state |
| 932 | * we can only allow the backlog to be adjusted. |
| 933 | */ |
| 934 | if (old_state != DCCP_LISTEN) { |
| 935 | /* |
| 936 | * FIXME: here it probably should be sk->sk_prot->listen_start |
| 937 | * see tcp_listen_start |
| 938 | */ |
| 939 | err = dccp_listen_start(sk, backlog); |
| 940 | if (err) |
| 941 | goto out; |
| 942 | } |
| 943 | sk->sk_max_ack_backlog = backlog; |
| 944 | err = 0; |
| 945 | |
| 946 | out: |
| 947 | release_sock(sk); |
| 948 | return err; |
| 949 | } |
| 950 | |
| 951 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
| 952 | |
| 953 | static void dccp_terminate_connection(struct sock *sk) |
| 954 | { |
| 955 | u8 next_state = DCCP_CLOSED; |
| 956 | |
| 957 | switch (sk->sk_state) { |
| 958 | case DCCP_PASSIVE_CLOSE: |
| 959 | case DCCP_PASSIVE_CLOSEREQ: |
| 960 | dccp_finish_passive_close(sk); |
| 961 | break; |
| 962 | case DCCP_PARTOPEN: |
| 963 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); |
| 964 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); |
| 965 | /* fall through */ |
| 966 | case DCCP_OPEN: |
| 967 | dccp_send_close(sk, 1); |
| 968 | |
| 969 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
| 970 | !dccp_sk(sk)->dccps_server_timewait) |
| 971 | next_state = DCCP_ACTIVE_CLOSEREQ; |
| 972 | else |
| 973 | next_state = DCCP_CLOSING; |
| 974 | /* fall through */ |
| 975 | default: |
| 976 | dccp_set_state(sk, next_state); |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | void dccp_close(struct sock *sk, long timeout) |
| 981 | { |
| 982 | struct dccp_sock *dp = dccp_sk(sk); |
| 983 | struct sk_buff *skb; |
| 984 | u32 data_was_unread = 0; |
| 985 | int state; |
| 986 | |
| 987 | lock_sock(sk); |
| 988 | |
| 989 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 990 | |
| 991 | if (sk->sk_state == DCCP_LISTEN) { |
| 992 | dccp_set_state(sk, DCCP_CLOSED); |
| 993 | |
| 994 | /* Special case. */ |
| 995 | inet_csk_listen_stop(sk); |
| 996 | |
| 997 | goto adjudge_to_death; |
| 998 | } |
| 999 | |
| 1000 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
| 1001 | |
| 1002 | /* |
| 1003 | * We need to flush the recv. buffs. We do this only on the |
| 1004 | * descriptor close, not protocol-sourced closes, because the |
| 1005 | *reader process may not have drained the data yet! |
| 1006 | */ |
| 1007 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
| 1008 | data_was_unread += skb->len; |
| 1009 | __kfree_skb(skb); |
| 1010 | } |
| 1011 | |
| 1012 | if (data_was_unread) { |
| 1013 | /* Unread data was tossed, send an appropriate Reset Code */ |
| 1014 | DCCP_WARN("ABORT with %u bytes unread\n", data_was_unread); |
| 1015 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 1016 | dccp_set_state(sk, DCCP_CLOSED); |
| 1017 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
| 1018 | /* Check zero linger _after_ checking for unread data. */ |
| 1019 | sk->sk_prot->disconnect(sk, 0); |
| 1020 | } else if (sk->sk_state != DCCP_CLOSED) { |
| 1021 | /* |
| 1022 | * Normal connection termination. May need to wait if there are |
| 1023 | * still packets in the TX queue that are delayed by the CCID. |
| 1024 | */ |
| 1025 | dccp_flush_write_queue(sk, &timeout); |
| 1026 | dccp_terminate_connection(sk); |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * Flush write queue. This may be necessary in several cases: |
| 1031 | * - we have been closed by the peer but still have application data; |
| 1032 | * - abortive termination (unread data or zero linger time), |
| 1033 | * - normal termination but queue could not be flushed within time limit |
| 1034 | */ |
| 1035 | __skb_queue_purge(&sk->sk_write_queue); |
| 1036 | |
| 1037 | sk_stream_wait_close(sk, timeout); |
| 1038 | |
| 1039 | adjudge_to_death: |
| 1040 | state = sk->sk_state; |
| 1041 | sock_hold(sk); |
| 1042 | sock_orphan(sk); |
| 1043 | |
| 1044 | /* |
| 1045 | * It is the last release_sock in its life. It will remove backlog. |
| 1046 | */ |
| 1047 | release_sock(sk); |
| 1048 | /* |
| 1049 | * Now socket is owned by kernel and we acquire BH lock |
| 1050 | * to finish close. No need to check for user refs. |
| 1051 | */ |
| 1052 | local_bh_disable(); |
| 1053 | bh_lock_sock(sk); |
| 1054 | WARN_ON(sock_owned_by_user(sk)); |
| 1055 | |
| 1056 | percpu_counter_inc(sk->sk_prot->orphan_count); |
| 1057 | |
| 1058 | /* Have we already been destroyed by a softirq or backlog? */ |
| 1059 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) |
| 1060 | goto out; |
| 1061 | |
| 1062 | if (sk->sk_state == DCCP_CLOSED) |
| 1063 | inet_csk_destroy_sock(sk); |
| 1064 | |
| 1065 | /* Otherwise, socket is reprieved until protocol close. */ |
| 1066 | |
| 1067 | out: |
| 1068 | bh_unlock_sock(sk); |
| 1069 | local_bh_enable(); |
| 1070 | sock_put(sk); |
| 1071 | } |
| 1072 | |
| 1073 | EXPORT_SYMBOL_GPL(dccp_close); |
| 1074 | |
| 1075 | void dccp_shutdown(struct sock *sk, int how) |
| 1076 | { |
| 1077 | dccp_pr_debug("called shutdown(%x)\n", how); |
| 1078 | } |
| 1079 | |
| 1080 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
| 1081 | |
| 1082 | static inline int __init dccp_mib_init(void) |
| 1083 | { |
| 1084 | dccp_statistics = alloc_percpu(struct dccp_mib); |
| 1085 | if (!dccp_statistics) |
| 1086 | return -ENOMEM; |
| 1087 | return 0; |
| 1088 | } |
| 1089 | |
| 1090 | static inline void dccp_mib_exit(void) |
| 1091 | { |
| 1092 | free_percpu(dccp_statistics); |
| 1093 | } |
| 1094 | |
| 1095 | static int thash_entries; |
| 1096 | module_param(thash_entries, int, 0444); |
| 1097 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); |
| 1098 | |
| 1099 | #ifdef CONFIG_IP_DCCP_DEBUG |
| 1100 | bool dccp_debug; |
| 1101 | module_param(dccp_debug, bool, 0644); |
| 1102 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
| 1103 | |
| 1104 | EXPORT_SYMBOL_GPL(dccp_debug); |
| 1105 | #endif |
| 1106 | |
| 1107 | static int __init dccp_init(void) |
| 1108 | { |
| 1109 | unsigned long goal; |
| 1110 | int ehash_order, bhash_order, i; |
| 1111 | int rc; |
| 1112 | |
| 1113 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
| 1114 | FIELD_SIZEOF(struct sk_buff, cb)); |
| 1115 | rc = percpu_counter_init(&dccp_orphan_count, 0, GFP_KERNEL); |
| 1116 | if (rc) |
| 1117 | goto out_fail; |
| 1118 | rc = -ENOBUFS; |
| 1119 | inet_hashinfo_init(&dccp_hashinfo); |
| 1120 | dccp_hashinfo.bind_bucket_cachep = |
| 1121 | kmem_cache_create("dccp_bind_bucket", |
| 1122 | sizeof(struct inet_bind_bucket), 0, |
| 1123 | SLAB_HWCACHE_ALIGN, NULL); |
| 1124 | if (!dccp_hashinfo.bind_bucket_cachep) |
| 1125 | goto out_free_percpu; |
| 1126 | |
| 1127 | /* |
| 1128 | * Size and allocate the main established and bind bucket |
| 1129 | * hash tables. |
| 1130 | * |
| 1131 | * The methodology is similar to that of the buffer cache. |
| 1132 | */ |
| 1133 | if (totalram_pages >= (128 * 1024)) |
| 1134 | goal = totalram_pages >> (21 - PAGE_SHIFT); |
| 1135 | else |
| 1136 | goal = totalram_pages >> (23 - PAGE_SHIFT); |
| 1137 | |
| 1138 | if (thash_entries) |
| 1139 | goal = (thash_entries * |
| 1140 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; |
| 1141 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
| 1142 | ; |
| 1143 | do { |
| 1144 | unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE / |
| 1145 | sizeof(struct inet_ehash_bucket); |
| 1146 | |
| 1147 | while (hash_size & (hash_size - 1)) |
| 1148 | hash_size--; |
| 1149 | dccp_hashinfo.ehash_mask = hash_size - 1; |
| 1150 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) |
| 1151 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order); |
| 1152 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); |
| 1153 | |
| 1154 | if (!dccp_hashinfo.ehash) { |
| 1155 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
| 1156 | goto out_free_bind_bucket_cachep; |
| 1157 | } |
| 1158 | |
| 1159 | for (i = 0; i <= dccp_hashinfo.ehash_mask; i++) |
| 1160 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); |
| 1161 | |
| 1162 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
| 1163 | goto out_free_dccp_ehash; |
| 1164 | |
| 1165 | bhash_order = ehash_order; |
| 1166 | |
| 1167 | do { |
| 1168 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / |
| 1169 | sizeof(struct inet_bind_hashbucket); |
| 1170 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
| 1171 | bhash_order > 0) |
| 1172 | continue; |
| 1173 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) |
| 1174 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, bhash_order); |
| 1175 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); |
| 1176 | |
| 1177 | if (!dccp_hashinfo.bhash) { |
| 1178 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
| 1179 | goto out_free_dccp_locks; |
| 1180 | } |
| 1181 | |
| 1182 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { |
| 1183 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); |
| 1184 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); |
| 1185 | } |
| 1186 | |
| 1187 | rc = dccp_mib_init(); |
| 1188 | if (rc) |
| 1189 | goto out_free_dccp_bhash; |
| 1190 | |
| 1191 | rc = dccp_ackvec_init(); |
| 1192 | if (rc) |
| 1193 | goto out_free_dccp_mib; |
| 1194 | |
| 1195 | rc = dccp_sysctl_init(); |
| 1196 | if (rc) |
| 1197 | goto out_ackvec_exit; |
| 1198 | |
| 1199 | rc = ccid_initialize_builtins(); |
| 1200 | if (rc) |
| 1201 | goto out_sysctl_exit; |
| 1202 | |
| 1203 | dccp_timestamping_init(); |
| 1204 | |
| 1205 | return 0; |
| 1206 | |
| 1207 | out_sysctl_exit: |
| 1208 | dccp_sysctl_exit(); |
| 1209 | out_ackvec_exit: |
| 1210 | dccp_ackvec_exit(); |
| 1211 | out_free_dccp_mib: |
| 1212 | dccp_mib_exit(); |
| 1213 | out_free_dccp_bhash: |
| 1214 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); |
| 1215 | out_free_dccp_locks: |
| 1216 | inet_ehash_locks_free(&dccp_hashinfo); |
| 1217 | out_free_dccp_ehash: |
| 1218 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); |
| 1219 | out_free_bind_bucket_cachep: |
| 1220 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
| 1221 | out_free_percpu: |
| 1222 | percpu_counter_destroy(&dccp_orphan_count); |
| 1223 | out_fail: |
| 1224 | dccp_hashinfo.bhash = NULL; |
| 1225 | dccp_hashinfo.ehash = NULL; |
| 1226 | dccp_hashinfo.bind_bucket_cachep = NULL; |
| 1227 | return rc; |
| 1228 | } |
| 1229 | |
| 1230 | static void __exit dccp_fini(void) |
| 1231 | { |
| 1232 | ccid_cleanup_builtins(); |
| 1233 | dccp_mib_exit(); |
| 1234 | free_pages((unsigned long)dccp_hashinfo.bhash, |
| 1235 | get_order(dccp_hashinfo.bhash_size * |
| 1236 | sizeof(struct inet_bind_hashbucket))); |
| 1237 | free_pages((unsigned long)dccp_hashinfo.ehash, |
| 1238 | get_order((dccp_hashinfo.ehash_mask + 1) * |
| 1239 | sizeof(struct inet_ehash_bucket))); |
| 1240 | inet_ehash_locks_free(&dccp_hashinfo); |
| 1241 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
| 1242 | dccp_ackvec_exit(); |
| 1243 | dccp_sysctl_exit(); |
| 1244 | percpu_counter_destroy(&dccp_orphan_count); |
| 1245 | } |
| 1246 | |
| 1247 | module_init(dccp_init); |
| 1248 | module_exit(dccp_fini); |
| 1249 | |
| 1250 | MODULE_LICENSE("GPL"); |
| 1251 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); |
| 1252 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |