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Commit | Line | Data |
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7c657876 ACM |
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 | ||
7c657876 ACM |
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 <net/checksum.h> | |
24 | ||
14c85021 | 25 | #include <net/inet_sock.h> |
7c657876 ACM |
26 | #include <net/sock.h> |
27 | #include <net/xfrm.h> | |
28 | ||
6273172e | 29 | #include <asm/ioctls.h> |
7c657876 ACM |
30 | #include <asm/semaphore.h> |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/poll.h> | |
7c657876 ACM |
35 | |
36 | #include "ccid.h" | |
37 | #include "dccp.h" | |
afe00251 | 38 | #include "feat.h" |
7c657876 | 39 | |
ba89966c | 40 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 | 41 | |
f21e68ca ACM |
42 | EXPORT_SYMBOL_GPL(dccp_statistics); |
43 | ||
7c657876 ACM |
44 | atomic_t dccp_orphan_count = ATOMIC_INIT(0); |
45 | ||
f21e68ca ACM |
46 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
47 | ||
075ae866 ACM |
48 | struct inet_hashinfo __cacheline_aligned dccp_hashinfo = { |
49 | .lhash_lock = RW_LOCK_UNLOCKED, | |
50 | .lhash_users = ATOMIC_INIT(0), | |
51 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait), | |
52 | }; | |
53 | ||
54 | EXPORT_SYMBOL_GPL(dccp_hashinfo); | |
55 | ||
b1308dc0 IM |
56 | /* the maximum queue length for tx in packets. 0 is no limit */ |
57 | int sysctl_dccp_tx_qlen __read_mostly = 5; | |
58 | ||
c25a18ba ACM |
59 | void dccp_set_state(struct sock *sk, const int state) |
60 | { | |
61 | const int oldstate = sk->sk_state; | |
62 | ||
f11135a3 | 63 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
c25a18ba ACM |
64 | dccp_state_name(oldstate), dccp_state_name(state)); |
65 | WARN_ON(state == oldstate); | |
66 | ||
67 | switch (state) { | |
68 | case DCCP_OPEN: | |
69 | if (oldstate != DCCP_OPEN) | |
70 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
71 | break; | |
72 | ||
73 | case DCCP_CLOSED: | |
0c869620 GR |
74 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
75 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
76 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
77 | ||
78 | sk->sk_prot->unhash(sk); | |
79 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
80 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
81 | inet_put_port(&dccp_hashinfo, sk); | |
82 | /* fall through */ | |
83 | default: | |
84 | if (oldstate == DCCP_OPEN) | |
85 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
86 | } | |
87 | ||
88 | /* Change state AFTER socket is unhashed to avoid closed | |
89 | * socket sitting in hash tables. | |
90 | */ | |
91 | sk->sk_state = state; | |
92 | } | |
93 | ||
94 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
95 | ||
0c869620 GR |
96 | static void dccp_finish_passive_close(struct sock *sk) |
97 | { | |
98 | switch (sk->sk_state) { | |
99 | case DCCP_PASSIVE_CLOSE: | |
100 | /* Node (client or server) has received Close packet. */ | |
101 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
102 | dccp_set_state(sk, DCCP_CLOSED); | |
103 | break; | |
104 | case DCCP_PASSIVE_CLOSEREQ: | |
105 | /* | |
106 | * Client received CloseReq. We set the `active' flag so that | |
107 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
108 | */ | |
109 | dccp_send_close(sk, 1); | |
110 | dccp_set_state(sk, DCCP_CLOSING); | |
111 | } | |
112 | } | |
113 | ||
c25a18ba ACM |
114 | void dccp_done(struct sock *sk) |
115 | { | |
116 | dccp_set_state(sk, DCCP_CLOSED); | |
117 | dccp_clear_xmit_timers(sk); | |
118 | ||
119 | sk->sk_shutdown = SHUTDOWN_MASK; | |
120 | ||
121 | if (!sock_flag(sk, SOCK_DEAD)) | |
122 | sk->sk_state_change(sk); | |
123 | else | |
124 | inet_csk_destroy_sock(sk); | |
125 | } | |
126 | ||
127 | EXPORT_SYMBOL_GPL(dccp_done); | |
128 | ||
7c657876 ACM |
129 | const char *dccp_packet_name(const int type) |
130 | { | |
131 | static const char *dccp_packet_names[] = { | |
132 | [DCCP_PKT_REQUEST] = "REQUEST", | |
133 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
134 | [DCCP_PKT_DATA] = "DATA", | |
135 | [DCCP_PKT_ACK] = "ACK", | |
136 | [DCCP_PKT_DATAACK] = "DATAACK", | |
137 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
138 | [DCCP_PKT_CLOSE] = "CLOSE", | |
139 | [DCCP_PKT_RESET] = "RESET", | |
140 | [DCCP_PKT_SYNC] = "SYNC", | |
141 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
142 | }; | |
143 | ||
144 | if (type >= DCCP_NR_PKT_TYPES) | |
145 | return "INVALID"; | |
146 | else | |
147 | return dccp_packet_names[type]; | |
148 | } | |
149 | ||
150 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
151 | ||
152 | const char *dccp_state_name(const int state) | |
153 | { | |
154 | static char *dccp_state_names[] = { | |
f11135a3 GR |
155 | [DCCP_OPEN] = "OPEN", |
156 | [DCCP_REQUESTING] = "REQUESTING", | |
157 | [DCCP_PARTOPEN] = "PARTOPEN", | |
158 | [DCCP_LISTEN] = "LISTEN", | |
159 | [DCCP_RESPOND] = "RESPOND", | |
160 | [DCCP_CLOSING] = "CLOSING", | |
161 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
162 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
163 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
164 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
165 | [DCCP_CLOSED] = "CLOSED", | |
7c657876 ACM |
166 | }; |
167 | ||
168 | if (state >= DCCP_MAX_STATES) | |
169 | return "INVALID STATE!"; | |
170 | else | |
171 | return dccp_state_names[state]; | |
172 | } | |
173 | ||
174 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
175 | ||
c985ed70 ACM |
176 | void dccp_hash(struct sock *sk) |
177 | { | |
178 | inet_hash(&dccp_hashinfo, sk); | |
179 | } | |
180 | ||
181 | EXPORT_SYMBOL_GPL(dccp_hash); | |
182 | ||
183 | void dccp_unhash(struct sock *sk) | |
184 | { | |
185 | inet_unhash(&dccp_hashinfo, sk); | |
186 | } | |
187 | ||
188 | EXPORT_SYMBOL_GPL(dccp_unhash); | |
189 | ||
72478873 | 190 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
191 | { |
192 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 193 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 | 194 | struct inet_connection_sock *icsk = inet_csk(sk); |
3e0fadc5 | 195 | |
a4bf3902 | 196 | dccp_minisock_init(&dp->dccps_minisock); |
3e0fadc5 | 197 | |
e18d7a98 ACM |
198 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
199 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
200 | sk->sk_state = DCCP_CLOSED; | |
201 | sk->sk_write_space = dccp_write_space; | |
202 | icsk->icsk_sync_mss = dccp_sync_mss; | |
203 | dp->dccps_mss_cache = 536; | |
204 | dp->dccps_rate_last = jiffies; | |
205 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
206 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
207 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; | |
208 | ||
209 | dccp_init_xmit_timers(sk); | |
210 | ||
3e0fadc5 ACM |
211 | /* |
212 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
213 | * the listening (master) sock get CCID control blocks, which is not | |
214 | * necessary, but for now, to not mess with the test userspace apps, | |
215 | * lets leave it here, later the real solution is to do this in a | |
216 | * setsockopt(CCIDs-I-want/accept). -acme | |
217 | */ | |
72478873 | 218 | if (likely(ctl_sock_initialized)) { |
8ca0d17b | 219 | int rc = dccp_feat_init(dmsk); |
3e0fadc5 ACM |
220 | |
221 | if (rc) | |
222 | return rc; | |
223 | ||
a4bf3902 | 224 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
225 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
226 | if (dp->dccps_hc_rx_ackvec == NULL) | |
227 | return -ENOMEM; | |
228 | } | |
a4bf3902 ACM |
229 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
230 | sk, GFP_KERNEL); | |
231 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
232 | sk, GFP_KERNEL); | |
8109b02b | 233 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
3e0fadc5 ACM |
234 | dp->dccps_hc_tx_ccid == NULL)) { |
235 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
236 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
a4bf3902 | 237 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
238 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
239 | dp->dccps_hc_rx_ackvec = NULL; | |
240 | } | |
241 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
242 | return -ENOMEM; | |
243 | } | |
244 | } else { | |
245 | /* control socket doesn't need feat nego */ | |
a4bf3902 ACM |
246 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
247 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
3e0fadc5 ACM |
248 | } |
249 | ||
3e0fadc5 ACM |
250 | return 0; |
251 | } | |
252 | ||
253 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
254 | ||
255 | int dccp_destroy_sock(struct sock *sk) | |
256 | { | |
257 | struct dccp_sock *dp = dccp_sk(sk); | |
8ca0d17b | 258 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
259 | |
260 | /* | |
261 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
262 | * for retransmissions | |
263 | */ | |
264 | if (sk->sk_send_head != NULL) { | |
265 | kfree_skb(sk->sk_send_head); | |
266 | sk->sk_send_head = NULL; | |
267 | } | |
268 | ||
269 | /* Clean up a referenced DCCP bind bucket. */ | |
270 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
271 | inet_put_port(&dccp_hashinfo, sk); | |
272 | ||
273 | kfree(dp->dccps_service_list); | |
274 | dp->dccps_service_list = NULL; | |
275 | ||
8ca0d17b | 276 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
277 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
278 | dp->dccps_hc_rx_ackvec = NULL; | |
279 | } | |
280 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
281 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
282 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
283 | ||
284 | /* clean up feature negotiation state */ | |
8ca0d17b | 285 | dccp_feat_clean(dmsk); |
3e0fadc5 ACM |
286 | |
287 | return 0; | |
288 | } | |
289 | ||
290 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
291 | ||
72a3effa | 292 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 293 | { |
67e6b629 ACM |
294 | struct dccp_sock *dp = dccp_sk(sk); |
295 | ||
296 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
72a3effa | 297 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
298 | } |
299 | ||
ce865a61 GR |
300 | static inline int dccp_need_reset(int state) |
301 | { | |
302 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
303 | state != DCCP_REQUESTING; | |
304 | } | |
305 | ||
7c657876 ACM |
306 | int dccp_disconnect(struct sock *sk, int flags) |
307 | { | |
308 | struct inet_connection_sock *icsk = inet_csk(sk); | |
309 | struct inet_sock *inet = inet_sk(sk); | |
310 | int err = 0; | |
311 | const int old_state = sk->sk_state; | |
312 | ||
313 | if (old_state != DCCP_CLOSED) | |
314 | dccp_set_state(sk, DCCP_CLOSED); | |
315 | ||
ce865a61 GR |
316 | /* |
317 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
318 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
319 | */ | |
7c657876 ACM |
320 | if (old_state == DCCP_LISTEN) { |
321 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
322 | } else if (dccp_need_reset(old_state)) { |
323 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
324 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
325 | } else if (old_state == DCCP_REQUESTING) |
326 | sk->sk_err = ECONNRESET; | |
327 | ||
328 | dccp_clear_xmit_timers(sk); | |
329 | __skb_queue_purge(&sk->sk_receive_queue); | |
330 | if (sk->sk_send_head != NULL) { | |
331 | __kfree_skb(sk->sk_send_head); | |
332 | sk->sk_send_head = NULL; | |
333 | } | |
334 | ||
335 | inet->dport = 0; | |
336 | ||
337 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
338 | inet_reset_saddr(sk); | |
339 | ||
340 | sk->sk_shutdown = 0; | |
341 | sock_reset_flag(sk, SOCK_DONE); | |
342 | ||
343 | icsk->icsk_backoff = 0; | |
344 | inet_csk_delack_init(sk); | |
345 | __sk_dst_reset(sk); | |
346 | ||
347 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
348 | ||
349 | sk->sk_error_report(sk); | |
350 | return err; | |
351 | } | |
352 | ||
f21e68ca ACM |
353 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
354 | ||
331968bd ACM |
355 | /* |
356 | * Wait for a DCCP event. | |
357 | * | |
358 | * Note that we don't need to lock the socket, as the upper poll layers | |
359 | * take care of normal races (between the test and the event) and we don't | |
360 | * go look at any of the socket buffers directly. | |
361 | */ | |
f21e68ca ACM |
362 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
363 | poll_table *wait) | |
331968bd ACM |
364 | { |
365 | unsigned int mask; | |
366 | struct sock *sk = sock->sk; | |
367 | ||
368 | poll_wait(file, sk->sk_sleep, wait); | |
369 | if (sk->sk_state == DCCP_LISTEN) | |
370 | return inet_csk_listen_poll(sk); | |
371 | ||
372 | /* Socket is not locked. We are protected from async events | |
373 | by poll logic and correct handling of state changes | |
374 | made by another threads is impossible in any case. | |
375 | */ | |
376 | ||
377 | mask = 0; | |
378 | if (sk->sk_err) | |
379 | mask = POLLERR; | |
380 | ||
381 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
382 | mask |= POLLHUP; | |
383 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 384 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
385 | |
386 | /* Connected? */ | |
387 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
388 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
389 | mask |= POLLIN | POLLRDNORM; | |
390 | ||
391 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
392 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
393 | mask |= POLLOUT | POLLWRNORM; | |
394 | } else { /* send SIGIO later */ | |
395 | set_bit(SOCK_ASYNC_NOSPACE, | |
396 | &sk->sk_socket->flags); | |
397 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
398 | ||
399 | /* Race breaker. If space is freed after | |
400 | * wspace test but before the flags are set, | |
401 | * IO signal will be lost. | |
402 | */ | |
403 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
404 | mask |= POLLOUT | POLLWRNORM; | |
405 | } | |
406 | } | |
407 | } | |
408 | return mask; | |
409 | } | |
410 | ||
f21e68ca ACM |
411 | EXPORT_SYMBOL_GPL(dccp_poll); |
412 | ||
7c657876 ACM |
413 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
414 | { | |
6273172e ACM |
415 | int rc = -ENOTCONN; |
416 | ||
417 | lock_sock(sk); | |
418 | ||
419 | if (sk->sk_state == DCCP_LISTEN) | |
420 | goto out; | |
421 | ||
422 | switch (cmd) { | |
423 | case SIOCINQ: { | |
424 | struct sk_buff *skb; | |
425 | unsigned long amount = 0; | |
426 | ||
427 | skb = skb_peek(&sk->sk_receive_queue); | |
428 | if (skb != NULL) { | |
429 | /* | |
430 | * We will only return the amount of this packet since | |
431 | * that is all that will be read. | |
432 | */ | |
433 | amount = skb->len; | |
434 | } | |
435 | rc = put_user(amount, (int __user *)arg); | |
436 | } | |
437 | break; | |
438 | default: | |
439 | rc = -ENOIOCTLCMD; | |
440 | break; | |
441 | } | |
442 | out: | |
443 | release_sock(sk); | |
444 | return rc; | |
7c657876 ACM |
445 | } |
446 | ||
f21e68ca ACM |
447 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
448 | ||
60fe62e7 | 449 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
450 | char __user *optval, int optlen) |
451 | { | |
452 | struct dccp_sock *dp = dccp_sk(sk); | |
453 | struct dccp_service_list *sl = NULL; | |
454 | ||
8109b02b | 455 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
456 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
457 | return -EINVAL; | |
458 | ||
459 | if (optlen > sizeof(service)) { | |
460 | sl = kmalloc(optlen, GFP_KERNEL); | |
461 | if (sl == NULL) | |
462 | return -ENOMEM; | |
463 | ||
464 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
465 | if (copy_from_user(sl->dccpsl_list, | |
466 | optval + sizeof(service), | |
467 | optlen - sizeof(service)) || | |
468 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
469 | kfree(sl); | |
470 | return -EFAULT; | |
471 | } | |
472 | } | |
473 | ||
474 | lock_sock(sk); | |
475 | dp->dccps_service = service; | |
476 | ||
a51482bd | 477 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
478 | |
479 | dp->dccps_service_list = sl; | |
480 | release_sock(sk); | |
481 | return 0; | |
482 | } | |
483 | ||
afe00251 AB |
484 | /* byte 1 is feature. the rest is the preference list */ |
485 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
486 | struct dccp_so_feat __user *optval) | |
487 | { | |
488 | struct dccp_so_feat opt; | |
489 | u8 *val; | |
490 | int rc; | |
491 | ||
492 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
493 | return -EFAULT; | |
494 | ||
495 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
496 | if (!val) | |
497 | return -ENOMEM; | |
498 | ||
499 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
500 | rc = -EFAULT; | |
501 | goto out_free_val; | |
502 | } | |
503 | ||
8ca0d17b ACM |
504 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
505 | val, opt.dccpsf_len, GFP_KERNEL); | |
afe00251 AB |
506 | if (rc) |
507 | goto out_free_val; | |
508 | ||
509 | out: | |
510 | return rc; | |
511 | ||
512 | out_free_val: | |
513 | kfree(val); | |
514 | goto out; | |
515 | } | |
516 | ||
3fdadf7d DM |
517 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
518 | char __user *optval, int optlen) | |
7c657876 | 519 | { |
09dbc389 GR |
520 | struct dccp_sock *dp = dccp_sk(sk); |
521 | int val, err = 0; | |
7c657876 | 522 | |
a84ffe43 ACM |
523 | if (optlen < sizeof(int)) |
524 | return -EINVAL; | |
525 | ||
526 | if (get_user(val, (int __user *)optval)) | |
527 | return -EFAULT; | |
528 | ||
67e6b629 ACM |
529 | if (optname == DCCP_SOCKOPT_SERVICE) |
530 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 531 | |
67e6b629 | 532 | lock_sock(sk); |
a84ffe43 ACM |
533 | switch (optname) { |
534 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 535 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 536 | err = 0; |
a84ffe43 | 537 | break; |
afe00251 AB |
538 | case DCCP_SOCKOPT_CHANGE_L: |
539 | if (optlen != sizeof(struct dccp_so_feat)) | |
540 | err = -EINVAL; | |
541 | else | |
542 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
c9eaf173 | 543 | (struct dccp_so_feat __user *) |
afe00251 AB |
544 | optval); |
545 | break; | |
afe00251 AB |
546 | case DCCP_SOCKOPT_CHANGE_R: |
547 | if (optlen != sizeof(struct dccp_so_feat)) | |
548 | err = -EINVAL; | |
549 | else | |
550 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
9faefb6d | 551 | (struct dccp_so_feat __user *) |
afe00251 AB |
552 | optval); |
553 | break; | |
b8599d20 GR |
554 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
555 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
556 | err = -EOPNOTSUPP; | |
557 | else | |
558 | dp->dccps_server_timewait = (val != 0); | |
559 | break; | |
6f4e5fff GR |
560 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
561 | if (val < 0 || val > 15) | |
562 | err = -EINVAL; | |
563 | else | |
564 | dp->dccps_pcslen = val; | |
565 | break; | |
566 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ | |
567 | if (val < 0 || val > 15) | |
568 | err = -EINVAL; | |
569 | else { | |
570 | dp->dccps_pcrlen = val; | |
571 | /* FIXME: add feature negotiation, | |
572 | * ChangeL(MinimumChecksumCoverage, val) */ | |
573 | } | |
574 | break; | |
a84ffe43 ACM |
575 | default: |
576 | err = -ENOPROTOOPT; | |
577 | break; | |
578 | } | |
6f4e5fff | 579 | |
a84ffe43 ACM |
580 | release_sock(sk); |
581 | return err; | |
7c657876 ACM |
582 | } |
583 | ||
3fdadf7d DM |
584 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
585 | char __user *optval, int optlen) | |
586 | { | |
587 | if (level != SOL_DCCP) | |
588 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
589 | optname, optval, | |
590 | optlen); | |
591 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
592 | } | |
543d9cfe | 593 | |
f21e68ca ACM |
594 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
595 | ||
3fdadf7d DM |
596 | #ifdef CONFIG_COMPAT |
597 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 598 | char __user *optval, int optlen) |
3fdadf7d | 599 | { |
dec73ff0 ACM |
600 | if (level != SOL_DCCP) |
601 | return inet_csk_compat_setsockopt(sk, level, optname, | |
602 | optval, optlen); | |
3fdadf7d DM |
603 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
604 | } | |
543d9cfe | 605 | |
3fdadf7d DM |
606 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
607 | #endif | |
608 | ||
67e6b629 | 609 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 610 | __be32 __user *optval, |
67e6b629 ACM |
611 | int __user *optlen) |
612 | { | |
613 | const struct dccp_sock *dp = dccp_sk(sk); | |
614 | const struct dccp_service_list *sl; | |
615 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
616 | ||
617 | lock_sock(sk); | |
67e6b629 ACM |
618 | if ((sl = dp->dccps_service_list) != NULL) { |
619 | slen = sl->dccpsl_nr * sizeof(u32); | |
620 | total_len += slen; | |
621 | } | |
622 | ||
623 | err = -EINVAL; | |
624 | if (total_len > len) | |
625 | goto out; | |
626 | ||
627 | err = 0; | |
628 | if (put_user(total_len, optlen) || | |
629 | put_user(dp->dccps_service, optval) || | |
630 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
631 | err = -EFAULT; | |
632 | out: | |
633 | release_sock(sk); | |
634 | return err; | |
635 | } | |
636 | ||
3fdadf7d | 637 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 638 | char __user *optval, int __user *optlen) |
7c657876 | 639 | { |
a84ffe43 ACM |
640 | struct dccp_sock *dp; |
641 | int val, len; | |
7c657876 | 642 | |
a84ffe43 ACM |
643 | if (get_user(len, optlen)) |
644 | return -EFAULT; | |
645 | ||
39ebc027 | 646 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
647 | return -EINVAL; |
648 | ||
649 | dp = dccp_sk(sk); | |
650 | ||
651 | switch (optname) { | |
652 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 653 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 654 | return 0; |
88f964db ACM |
655 | case DCCP_SOCKOPT_SERVICE: |
656 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 657 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
658 | case DCCP_SOCKOPT_GET_CUR_MPS: |
659 | val = dp->dccps_mss_cache; | |
7c559a9e | 660 | break; |
b8599d20 GR |
661 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
662 | val = dp->dccps_server_timewait; | |
b8599d20 | 663 | break; |
6f4e5fff GR |
664 | case DCCP_SOCKOPT_SEND_CSCOV: |
665 | val = dp->dccps_pcslen; | |
666 | break; | |
667 | case DCCP_SOCKOPT_RECV_CSCOV: | |
668 | val = dp->dccps_pcrlen; | |
669 | break; | |
88f964db ACM |
670 | case 128 ... 191: |
671 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
672 | len, (u32 __user *)optval, optlen); | |
673 | case 192 ... 255: | |
674 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
675 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
676 | default: |
677 | return -ENOPROTOOPT; | |
678 | } | |
679 | ||
79133506 | 680 | len = sizeof(val); |
a84ffe43 ACM |
681 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
682 | return -EFAULT; | |
683 | ||
684 | return 0; | |
7c657876 ACM |
685 | } |
686 | ||
3fdadf7d DM |
687 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
688 | char __user *optval, int __user *optlen) | |
689 | { | |
690 | if (level != SOL_DCCP) | |
691 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
692 | optname, optval, | |
693 | optlen); | |
694 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
695 | } | |
543d9cfe | 696 | |
f21e68ca ACM |
697 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
698 | ||
3fdadf7d DM |
699 | #ifdef CONFIG_COMPAT |
700 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 701 | char __user *optval, int __user *optlen) |
3fdadf7d | 702 | { |
dec73ff0 ACM |
703 | if (level != SOL_DCCP) |
704 | return inet_csk_compat_getsockopt(sk, level, optname, | |
705 | optval, optlen); | |
3fdadf7d DM |
706 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
707 | } | |
543d9cfe | 708 | |
3fdadf7d DM |
709 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
710 | #endif | |
711 | ||
7c657876 ACM |
712 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
713 | size_t len) | |
714 | { | |
715 | const struct dccp_sock *dp = dccp_sk(sk); | |
716 | const int flags = msg->msg_flags; | |
717 | const int noblock = flags & MSG_DONTWAIT; | |
718 | struct sk_buff *skb; | |
719 | int rc, size; | |
720 | long timeo; | |
721 | ||
722 | if (len > dp->dccps_mss_cache) | |
723 | return -EMSGSIZE; | |
724 | ||
725 | lock_sock(sk); | |
b1308dc0 IM |
726 | |
727 | if (sysctl_dccp_tx_qlen && | |
728 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
729 | rc = -EAGAIN; | |
730 | goto out_release; | |
731 | } | |
732 | ||
27258ee5 | 733 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
734 | |
735 | /* | |
736 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
737 | * so that the trick in dccp_rcv_request_sent_state_process. | |
738 | */ | |
739 | /* Wait for a connection to finish. */ | |
cecd8d0e | 740 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 741 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 742 | goto out_release; |
7c657876 ACM |
743 | |
744 | size = sk->sk_prot->max_header + len; | |
745 | release_sock(sk); | |
746 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
747 | lock_sock(sk); | |
7c657876 ACM |
748 | if (skb == NULL) |
749 | goto out_release; | |
750 | ||
751 | skb_reserve(skb, sk->sk_prot->max_header); | |
752 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
753 | if (rc != 0) |
754 | goto out_discard; | |
755 | ||
97e5848d IM |
756 | skb_queue_tail(&sk->sk_write_queue, skb); |
757 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
758 | out_release: |
759 | release_sock(sk); | |
760 | return rc ? : len; | |
27258ee5 ACM |
761 | out_discard: |
762 | kfree_skb(skb); | |
7c657876 | 763 | goto out_release; |
7c657876 ACM |
764 | } |
765 | ||
f21e68ca ACM |
766 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
767 | ||
7c657876 ACM |
768 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
769 | size_t len, int nonblock, int flags, int *addr_len) | |
770 | { | |
771 | const struct dccp_hdr *dh; | |
7c657876 ACM |
772 | long timeo; |
773 | ||
774 | lock_sock(sk); | |
775 | ||
531669a0 ACM |
776 | if (sk->sk_state == DCCP_LISTEN) { |
777 | len = -ENOTCONN; | |
7c657876 | 778 | goto out; |
7c657876 | 779 | } |
7c657876 | 780 | |
531669a0 | 781 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
782 | |
783 | do { | |
531669a0 | 784 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 785 | |
531669a0 ACM |
786 | if (skb == NULL) |
787 | goto verify_sock_status; | |
7c657876 | 788 | |
531669a0 | 789 | dh = dccp_hdr(skb); |
7c657876 | 790 | |
0c869620 GR |
791 | switch (dh->dccph_type) { |
792 | case DCCP_PKT_DATA: | |
793 | case DCCP_PKT_DATAACK: | |
531669a0 | 794 | goto found_ok_skb; |
7c657876 | 795 | |
0c869620 GR |
796 | case DCCP_PKT_CLOSE: |
797 | case DCCP_PKT_CLOSEREQ: | |
798 | if (!(flags & MSG_PEEK)) | |
799 | dccp_finish_passive_close(sk); | |
800 | /* fall through */ | |
801 | case DCCP_PKT_RESET: | |
802 | dccp_pr_debug("found fin (%s) ok!\n", | |
803 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
804 | len = 0; |
805 | goto found_fin_ok; | |
0c869620 GR |
806 | default: |
807 | dccp_pr_debug("packet_type=%s\n", | |
808 | dccp_packet_name(dh->dccph_type)); | |
809 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 810 | } |
531669a0 ACM |
811 | verify_sock_status: |
812 | if (sock_flag(sk, SOCK_DONE)) { | |
813 | len = 0; | |
7c657876 | 814 | break; |
531669a0 | 815 | } |
7c657876 | 816 | |
531669a0 ACM |
817 | if (sk->sk_err) { |
818 | len = sock_error(sk); | |
819 | break; | |
820 | } | |
7c657876 | 821 | |
531669a0 ACM |
822 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
823 | len = 0; | |
824 | break; | |
825 | } | |
7c657876 | 826 | |
531669a0 ACM |
827 | if (sk->sk_state == DCCP_CLOSED) { |
828 | if (!sock_flag(sk, SOCK_DONE)) { | |
829 | /* This occurs when user tries to read | |
830 | * from never connected socket. | |
831 | */ | |
832 | len = -ENOTCONN; | |
7c657876 ACM |
833 | break; |
834 | } | |
531669a0 ACM |
835 | len = 0; |
836 | break; | |
7c657876 ACM |
837 | } |
838 | ||
531669a0 ACM |
839 | if (!timeo) { |
840 | len = -EAGAIN; | |
841 | break; | |
842 | } | |
7c657876 | 843 | |
531669a0 ACM |
844 | if (signal_pending(current)) { |
845 | len = sock_intr_errno(timeo); | |
846 | break; | |
847 | } | |
7c657876 | 848 | |
531669a0 | 849 | sk_wait_data(sk, &timeo); |
7c657876 | 850 | continue; |
7c657876 | 851 | found_ok_skb: |
531669a0 ACM |
852 | if (len > skb->len) |
853 | len = skb->len; | |
854 | else if (len < skb->len) | |
855 | msg->msg_flags |= MSG_TRUNC; | |
856 | ||
857 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
858 | /* Exception. Bailout! */ | |
859 | len = -EFAULT; | |
860 | break; | |
7c657876 | 861 | } |
7c657876 ACM |
862 | found_fin_ok: |
863 | if (!(flags & MSG_PEEK)) | |
624d1164 | 864 | sk_eat_skb(sk, skb, 0); |
7c657876 | 865 | break; |
531669a0 | 866 | } while (1); |
7c657876 ACM |
867 | out: |
868 | release_sock(sk); | |
531669a0 | 869 | return len; |
7c657876 ACM |
870 | } |
871 | ||
f21e68ca ACM |
872 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
873 | ||
874 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
875 | { |
876 | struct sock *sk = sock->sk; | |
877 | unsigned char old_state; | |
878 | int err; | |
879 | ||
880 | lock_sock(sk); | |
881 | ||
882 | err = -EINVAL; | |
883 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
884 | goto out; | |
885 | ||
886 | old_state = sk->sk_state; | |
887 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
888 | goto out; | |
889 | ||
890 | /* Really, if the socket is already in listen state | |
891 | * we can only allow the backlog to be adjusted. | |
892 | */ | |
893 | if (old_state != DCCP_LISTEN) { | |
894 | /* | |
895 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
896 | * see tcp_listen_start | |
897 | */ | |
72a3effa | 898 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
899 | if (err) |
900 | goto out; | |
901 | } | |
902 | sk->sk_max_ack_backlog = backlog; | |
903 | err = 0; | |
904 | ||
905 | out: | |
906 | release_sock(sk); | |
907 | return err; | |
908 | } | |
909 | ||
f21e68ca ACM |
910 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
911 | ||
0c869620 | 912 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 913 | { |
0c869620 | 914 | u8 next_state = DCCP_CLOSED; |
7c657876 | 915 | |
0c869620 GR |
916 | switch (sk->sk_state) { |
917 | case DCCP_PASSIVE_CLOSE: | |
918 | case DCCP_PASSIVE_CLOSEREQ: | |
919 | dccp_finish_passive_close(sk); | |
920 | break; | |
921 | case DCCP_PARTOPEN: | |
922 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
923 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
924 | /* fall through */ | |
925 | case DCCP_OPEN: | |
926 | dccp_send_close(sk, 1); | |
7c657876 | 927 | |
b8599d20 GR |
928 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
929 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
930 | next_state = DCCP_ACTIVE_CLOSEREQ; |
931 | else | |
932 | next_state = DCCP_CLOSING; | |
933 | /* fall through */ | |
934 | default: | |
935 | dccp_set_state(sk, next_state); | |
936 | } | |
7c657876 ACM |
937 | } |
938 | ||
939 | void dccp_close(struct sock *sk, long timeout) | |
940 | { | |
97e5848d | 941 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 942 | struct sk_buff *skb; |
d83bd95b | 943 | u32 data_was_unread = 0; |
134af346 | 944 | int state; |
7c657876 ACM |
945 | |
946 | lock_sock(sk); | |
947 | ||
948 | sk->sk_shutdown = SHUTDOWN_MASK; | |
949 | ||
950 | if (sk->sk_state == DCCP_LISTEN) { | |
951 | dccp_set_state(sk, DCCP_CLOSED); | |
952 | ||
953 | /* Special case. */ | |
954 | inet_csk_listen_stop(sk); | |
955 | ||
956 | goto adjudge_to_death; | |
957 | } | |
958 | ||
97e5848d IM |
959 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
960 | ||
7c657876 ACM |
961 | /* |
962 | * We need to flush the recv. buffs. We do this only on the | |
963 | * descriptor close, not protocol-sourced closes, because the | |
964 | *reader process may not have drained the data yet! | |
965 | */ | |
7c657876 | 966 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 967 | data_was_unread += skb->len; |
7c657876 ACM |
968 | __kfree_skb(skb); |
969 | } | |
970 | ||
d83bd95b GR |
971 | if (data_was_unread) { |
972 | /* Unread data was tossed, send an appropriate Reset Code */ | |
973 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
974 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
975 | dccp_set_state(sk, DCCP_CLOSED); | |
976 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
977 | /* Check zero linger _after_ checking for unread data. */ |
978 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
979 | } else if (sk->sk_state != DCCP_CLOSED) { |
980 | dccp_terminate_connection(sk); | |
7c657876 ACM |
981 | } |
982 | ||
983 | sk_stream_wait_close(sk, timeout); | |
984 | ||
985 | adjudge_to_death: | |
134af346 HX |
986 | state = sk->sk_state; |
987 | sock_hold(sk); | |
988 | sock_orphan(sk); | |
989 | atomic_inc(sk->sk_prot->orphan_count); | |
990 | ||
7ad07e7c ACM |
991 | /* |
992 | * It is the last release_sock in its life. It will remove backlog. | |
993 | */ | |
7c657876 ACM |
994 | release_sock(sk); |
995 | /* | |
996 | * Now socket is owned by kernel and we acquire BH lock | |
997 | * to finish close. No need to check for user refs. | |
998 | */ | |
999 | local_bh_disable(); | |
1000 | bh_lock_sock(sk); | |
1001 | BUG_TRAP(!sock_owned_by_user(sk)); | |
1002 | ||
134af346 HX |
1003 | /* Have we already been destroyed by a softirq or backlog? */ |
1004 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
1005 | goto out; | |
7ad07e7c | 1006 | |
7c657876 ACM |
1007 | if (sk->sk_state == DCCP_CLOSED) |
1008 | inet_csk_destroy_sock(sk); | |
1009 | ||
1010 | /* Otherwise, socket is reprieved until protocol close. */ | |
1011 | ||
134af346 | 1012 | out: |
7c657876 ACM |
1013 | bh_unlock_sock(sk); |
1014 | local_bh_enable(); | |
1015 | sock_put(sk); | |
1016 | } | |
1017 | ||
f21e68ca ACM |
1018 | EXPORT_SYMBOL_GPL(dccp_close); |
1019 | ||
7c657876 ACM |
1020 | void dccp_shutdown(struct sock *sk, int how) |
1021 | { | |
8e8c71f1 | 1022 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1023 | } |
1024 | ||
f21e68ca ACM |
1025 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1026 | ||
46f09ffa | 1027 | static int __init dccp_mib_init(void) |
7c657876 ACM |
1028 | { |
1029 | int rc = -ENOMEM; | |
1030 | ||
1031 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
1032 | if (dccp_statistics[0] == NULL) | |
1033 | goto out; | |
1034 | ||
1035 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
1036 | if (dccp_statistics[1] == NULL) | |
1037 | goto out_free_one; | |
1038 | ||
1039 | rc = 0; | |
1040 | out: | |
1041 | return rc; | |
1042 | out_free_one: | |
1043 | free_percpu(dccp_statistics[0]); | |
1044 | dccp_statistics[0] = NULL; | |
1045 | goto out; | |
1046 | ||
1047 | } | |
1048 | ||
b61fafc4 | 1049 | static void dccp_mib_exit(void) |
46f09ffa ACM |
1050 | { |
1051 | free_percpu(dccp_statistics[0]); | |
1052 | free_percpu(dccp_statistics[1]); | |
1053 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
1054 | } | |
1055 | ||
7c657876 ACM |
1056 | static int thash_entries; |
1057 | module_param(thash_entries, int, 0444); | |
1058 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1059 | ||
a1d3a355 | 1060 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1061 | int dccp_debug; |
042d18f9 | 1062 | module_param(dccp_debug, bool, 0444); |
7c657876 | 1063 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1064 | |
1065 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1066 | #endif |
7c657876 ACM |
1067 | |
1068 | static int __init dccp_init(void) | |
1069 | { | |
1070 | unsigned long goal; | |
1071 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1072 | int rc = -ENOBUFS; |
7c657876 | 1073 | |
7690af3f ACM |
1074 | dccp_hashinfo.bind_bucket_cachep = |
1075 | kmem_cache_create("dccp_bind_bucket", | |
1076 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1077 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1078 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1079 | goto out; |
7c657876 ACM |
1080 | |
1081 | /* | |
1082 | * Size and allocate the main established and bind bucket | |
1083 | * hash tables. | |
1084 | * | |
1085 | * The methodology is similar to that of the buffer cache. | |
1086 | */ | |
1087 | if (num_physpages >= (128 * 1024)) | |
1088 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1089 | else | |
1090 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1091 | ||
1092 | if (thash_entries) | |
7690af3f ACM |
1093 | goal = (thash_entries * |
1094 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1095 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1096 | ; | |
1097 | do { | |
1098 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1099 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1100 | while (dccp_hashinfo.ehash_size & |
1101 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1102 | dccp_hashinfo.ehash_size--; |
1103 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1104 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1105 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1106 | ||
1107 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1108 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1109 | goto out_free_bind_bucket_cachep; |
1110 | } | |
1111 | ||
dbca9b27 | 1112 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1113 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1114 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1115 | } |
1116 | ||
230140cf ED |
1117 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1118 | goto out_free_dccp_ehash; | |
1119 | ||
7c657876 ACM |
1120 | bhash_order = ehash_order; |
1121 | ||
1122 | do { | |
1123 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1124 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1125 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1126 | bhash_order > 0) | |
7c657876 ACM |
1127 | continue; |
1128 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1129 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1130 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1131 | ||
1132 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1133 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1134 | goto out_free_dccp_locks; |
7c657876 ACM |
1135 | } |
1136 | ||
1137 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1138 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1139 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1140 | } | |
1141 | ||
46f09ffa | 1142 | rc = dccp_mib_init(); |
fa23e2ec | 1143 | if (rc) |
7c657876 ACM |
1144 | goto out_free_dccp_bhash; |
1145 | ||
9b07ef5d | 1146 | rc = dccp_ackvec_init(); |
7c657876 | 1147 | if (rc) |
b61fafc4 | 1148 | goto out_free_dccp_mib; |
9b07ef5d | 1149 | |
e55d912f | 1150 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1151 | if (rc) |
1152 | goto out_ackvec_exit; | |
4c70f383 GR |
1153 | |
1154 | dccp_timestamping_init(); | |
7c657876 ACM |
1155 | out: |
1156 | return rc; | |
9b07ef5d ACM |
1157 | out_ackvec_exit: |
1158 | dccp_ackvec_exit(); | |
b61fafc4 | 1159 | out_free_dccp_mib: |
46f09ffa | 1160 | dccp_mib_exit(); |
7c657876 ACM |
1161 | out_free_dccp_bhash: |
1162 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1163 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1164 | out_free_dccp_locks: |
1165 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1166 | out_free_dccp_ehash: |
1167 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1168 | dccp_hashinfo.ehash = NULL; | |
1169 | out_free_bind_bucket_cachep: | |
1170 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1171 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1172 | goto out; |
1173 | } | |
1174 | ||
7c657876 ACM |
1175 | static void __exit dccp_fini(void) |
1176 | { | |
46f09ffa | 1177 | dccp_mib_exit(); |
725ba8ee ACM |
1178 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1179 | get_order(dccp_hashinfo.bhash_size * | |
1180 | sizeof(struct inet_bind_hashbucket))); | |
1181 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1182 | get_order(dccp_hashinfo.ehash_size * | |
1183 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1184 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1185 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1186 | dccp_ackvec_exit(); |
e55d912f | 1187 | dccp_sysctl_exit(); |
7c657876 ACM |
1188 | } |
1189 | ||
1190 | module_init(dccp_init); | |
1191 | module_exit(dccp_fini); | |
1192 | ||
7c657876 ACM |
1193 | MODULE_LICENSE("GPL"); |
1194 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1195 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |