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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: | |
74 | if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN) | |
75 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); | |
76 | ||
77 | sk->sk_prot->unhash(sk); | |
78 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
79 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
80 | inet_put_port(&dccp_hashinfo, sk); | |
81 | /* fall through */ | |
82 | default: | |
83 | if (oldstate == DCCP_OPEN) | |
84 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
85 | } | |
86 | ||
87 | /* Change state AFTER socket is unhashed to avoid closed | |
88 | * socket sitting in hash tables. | |
89 | */ | |
90 | sk->sk_state = state; | |
91 | } | |
92 | ||
93 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
94 | ||
95 | void dccp_done(struct sock *sk) | |
96 | { | |
97 | dccp_set_state(sk, DCCP_CLOSED); | |
98 | dccp_clear_xmit_timers(sk); | |
99 | ||
100 | sk->sk_shutdown = SHUTDOWN_MASK; | |
101 | ||
102 | if (!sock_flag(sk, SOCK_DEAD)) | |
103 | sk->sk_state_change(sk); | |
104 | else | |
105 | inet_csk_destroy_sock(sk); | |
106 | } | |
107 | ||
108 | EXPORT_SYMBOL_GPL(dccp_done); | |
109 | ||
7c657876 ACM |
110 | const char *dccp_packet_name(const int type) |
111 | { | |
112 | static const char *dccp_packet_names[] = { | |
113 | [DCCP_PKT_REQUEST] = "REQUEST", | |
114 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
115 | [DCCP_PKT_DATA] = "DATA", | |
116 | [DCCP_PKT_ACK] = "ACK", | |
117 | [DCCP_PKT_DATAACK] = "DATAACK", | |
118 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
119 | [DCCP_PKT_CLOSE] = "CLOSE", | |
120 | [DCCP_PKT_RESET] = "RESET", | |
121 | [DCCP_PKT_SYNC] = "SYNC", | |
122 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
123 | }; | |
124 | ||
125 | if (type >= DCCP_NR_PKT_TYPES) | |
126 | return "INVALID"; | |
127 | else | |
128 | return dccp_packet_names[type]; | |
129 | } | |
130 | ||
131 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
132 | ||
133 | const char *dccp_state_name(const int state) | |
134 | { | |
135 | static char *dccp_state_names[] = { | |
f11135a3 GR |
136 | [DCCP_OPEN] = "OPEN", |
137 | [DCCP_REQUESTING] = "REQUESTING", | |
138 | [DCCP_PARTOPEN] = "PARTOPEN", | |
139 | [DCCP_LISTEN] = "LISTEN", | |
140 | [DCCP_RESPOND] = "RESPOND", | |
141 | [DCCP_CLOSING] = "CLOSING", | |
142 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
143 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
144 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
145 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
146 | [DCCP_CLOSED] = "CLOSED", | |
7c657876 ACM |
147 | }; |
148 | ||
149 | if (state >= DCCP_MAX_STATES) | |
150 | return "INVALID STATE!"; | |
151 | else | |
152 | return dccp_state_names[state]; | |
153 | } | |
154 | ||
155 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
156 | ||
c985ed70 ACM |
157 | void dccp_hash(struct sock *sk) |
158 | { | |
159 | inet_hash(&dccp_hashinfo, sk); | |
160 | } | |
161 | ||
162 | EXPORT_SYMBOL_GPL(dccp_hash); | |
163 | ||
164 | void dccp_unhash(struct sock *sk) | |
165 | { | |
166 | inet_unhash(&dccp_hashinfo, sk); | |
167 | } | |
168 | ||
169 | EXPORT_SYMBOL_GPL(dccp_unhash); | |
170 | ||
72478873 | 171 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
172 | { |
173 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 174 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 | 175 | struct inet_connection_sock *icsk = inet_csk(sk); |
3e0fadc5 | 176 | |
a4bf3902 | 177 | dccp_minisock_init(&dp->dccps_minisock); |
3e0fadc5 | 178 | |
e18d7a98 ACM |
179 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
180 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
181 | sk->sk_state = DCCP_CLOSED; | |
182 | sk->sk_write_space = dccp_write_space; | |
183 | icsk->icsk_sync_mss = dccp_sync_mss; | |
184 | dp->dccps_mss_cache = 536; | |
185 | dp->dccps_rate_last = jiffies; | |
186 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
187 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
188 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; | |
189 | ||
190 | dccp_init_xmit_timers(sk); | |
191 | ||
3e0fadc5 ACM |
192 | /* |
193 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
194 | * the listening (master) sock get CCID control blocks, which is not | |
195 | * necessary, but for now, to not mess with the test userspace apps, | |
196 | * lets leave it here, later the real solution is to do this in a | |
197 | * setsockopt(CCIDs-I-want/accept). -acme | |
198 | */ | |
72478873 | 199 | if (likely(ctl_sock_initialized)) { |
8ca0d17b | 200 | int rc = dccp_feat_init(dmsk); |
3e0fadc5 ACM |
201 | |
202 | if (rc) | |
203 | return rc; | |
204 | ||
a4bf3902 | 205 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
206 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
207 | if (dp->dccps_hc_rx_ackvec == NULL) | |
208 | return -ENOMEM; | |
209 | } | |
a4bf3902 ACM |
210 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
211 | sk, GFP_KERNEL); | |
212 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
213 | sk, GFP_KERNEL); | |
8109b02b | 214 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
3e0fadc5 ACM |
215 | dp->dccps_hc_tx_ccid == NULL)) { |
216 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
217 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
a4bf3902 | 218 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
219 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
220 | dp->dccps_hc_rx_ackvec = NULL; | |
221 | } | |
222 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
223 | return -ENOMEM; | |
224 | } | |
225 | } else { | |
226 | /* control socket doesn't need feat nego */ | |
a4bf3902 ACM |
227 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
228 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
3e0fadc5 ACM |
229 | } |
230 | ||
3e0fadc5 ACM |
231 | return 0; |
232 | } | |
233 | ||
234 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
235 | ||
236 | int dccp_destroy_sock(struct sock *sk) | |
237 | { | |
238 | struct dccp_sock *dp = dccp_sk(sk); | |
8ca0d17b | 239 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
240 | |
241 | /* | |
242 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
243 | * for retransmissions | |
244 | */ | |
245 | if (sk->sk_send_head != NULL) { | |
246 | kfree_skb(sk->sk_send_head); | |
247 | sk->sk_send_head = NULL; | |
248 | } | |
249 | ||
250 | /* Clean up a referenced DCCP bind bucket. */ | |
251 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
252 | inet_put_port(&dccp_hashinfo, sk); | |
253 | ||
254 | kfree(dp->dccps_service_list); | |
255 | dp->dccps_service_list = NULL; | |
256 | ||
8ca0d17b | 257 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
258 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
259 | dp->dccps_hc_rx_ackvec = NULL; | |
260 | } | |
261 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
262 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
263 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
264 | ||
265 | /* clean up feature negotiation state */ | |
8ca0d17b | 266 | dccp_feat_clean(dmsk); |
3e0fadc5 ACM |
267 | |
268 | return 0; | |
269 | } | |
270 | ||
271 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
272 | ||
72a3effa | 273 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 274 | { |
67e6b629 ACM |
275 | struct dccp_sock *dp = dccp_sk(sk); |
276 | ||
277 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
72a3effa | 278 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
279 | } |
280 | ||
ce865a61 GR |
281 | static inline int dccp_need_reset(int state) |
282 | { | |
283 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
284 | state != DCCP_REQUESTING; | |
285 | } | |
286 | ||
7c657876 ACM |
287 | int dccp_disconnect(struct sock *sk, int flags) |
288 | { | |
289 | struct inet_connection_sock *icsk = inet_csk(sk); | |
290 | struct inet_sock *inet = inet_sk(sk); | |
291 | int err = 0; | |
292 | const int old_state = sk->sk_state; | |
293 | ||
294 | if (old_state != DCCP_CLOSED) | |
295 | dccp_set_state(sk, DCCP_CLOSED); | |
296 | ||
ce865a61 GR |
297 | /* |
298 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
299 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
300 | */ | |
7c657876 ACM |
301 | if (old_state == DCCP_LISTEN) { |
302 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
303 | } else if (dccp_need_reset(old_state)) { |
304 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
305 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
306 | } else if (old_state == DCCP_REQUESTING) |
307 | sk->sk_err = ECONNRESET; | |
308 | ||
309 | dccp_clear_xmit_timers(sk); | |
310 | __skb_queue_purge(&sk->sk_receive_queue); | |
311 | if (sk->sk_send_head != NULL) { | |
312 | __kfree_skb(sk->sk_send_head); | |
313 | sk->sk_send_head = NULL; | |
314 | } | |
315 | ||
316 | inet->dport = 0; | |
317 | ||
318 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
319 | inet_reset_saddr(sk); | |
320 | ||
321 | sk->sk_shutdown = 0; | |
322 | sock_reset_flag(sk, SOCK_DONE); | |
323 | ||
324 | icsk->icsk_backoff = 0; | |
325 | inet_csk_delack_init(sk); | |
326 | __sk_dst_reset(sk); | |
327 | ||
328 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
329 | ||
330 | sk->sk_error_report(sk); | |
331 | return err; | |
332 | } | |
333 | ||
f21e68ca ACM |
334 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
335 | ||
331968bd ACM |
336 | /* |
337 | * Wait for a DCCP event. | |
338 | * | |
339 | * Note that we don't need to lock the socket, as the upper poll layers | |
340 | * take care of normal races (between the test and the event) and we don't | |
341 | * go look at any of the socket buffers directly. | |
342 | */ | |
f21e68ca ACM |
343 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
344 | poll_table *wait) | |
331968bd ACM |
345 | { |
346 | unsigned int mask; | |
347 | struct sock *sk = sock->sk; | |
348 | ||
349 | poll_wait(file, sk->sk_sleep, wait); | |
350 | if (sk->sk_state == DCCP_LISTEN) | |
351 | return inet_csk_listen_poll(sk); | |
352 | ||
353 | /* Socket is not locked. We are protected from async events | |
354 | by poll logic and correct handling of state changes | |
355 | made by another threads is impossible in any case. | |
356 | */ | |
357 | ||
358 | mask = 0; | |
359 | if (sk->sk_err) | |
360 | mask = POLLERR; | |
361 | ||
362 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
363 | mask |= POLLHUP; | |
364 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 365 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
366 | |
367 | /* Connected? */ | |
368 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
369 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
370 | mask |= POLLIN | POLLRDNORM; | |
371 | ||
372 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
373 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
374 | mask |= POLLOUT | POLLWRNORM; | |
375 | } else { /* send SIGIO later */ | |
376 | set_bit(SOCK_ASYNC_NOSPACE, | |
377 | &sk->sk_socket->flags); | |
378 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
379 | ||
380 | /* Race breaker. If space is freed after | |
381 | * wspace test but before the flags are set, | |
382 | * IO signal will be lost. | |
383 | */ | |
384 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
385 | mask |= POLLOUT | POLLWRNORM; | |
386 | } | |
387 | } | |
388 | } | |
389 | return mask; | |
390 | } | |
391 | ||
f21e68ca ACM |
392 | EXPORT_SYMBOL_GPL(dccp_poll); |
393 | ||
7c657876 ACM |
394 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
395 | { | |
6273172e ACM |
396 | int rc = -ENOTCONN; |
397 | ||
398 | lock_sock(sk); | |
399 | ||
400 | if (sk->sk_state == DCCP_LISTEN) | |
401 | goto out; | |
402 | ||
403 | switch (cmd) { | |
404 | case SIOCINQ: { | |
405 | struct sk_buff *skb; | |
406 | unsigned long amount = 0; | |
407 | ||
408 | skb = skb_peek(&sk->sk_receive_queue); | |
409 | if (skb != NULL) { | |
410 | /* | |
411 | * We will only return the amount of this packet since | |
412 | * that is all that will be read. | |
413 | */ | |
414 | amount = skb->len; | |
415 | } | |
416 | rc = put_user(amount, (int __user *)arg); | |
417 | } | |
418 | break; | |
419 | default: | |
420 | rc = -ENOIOCTLCMD; | |
421 | break; | |
422 | } | |
423 | out: | |
424 | release_sock(sk); | |
425 | return rc; | |
7c657876 ACM |
426 | } |
427 | ||
f21e68ca ACM |
428 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
429 | ||
60fe62e7 | 430 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
431 | char __user *optval, int optlen) |
432 | { | |
433 | struct dccp_sock *dp = dccp_sk(sk); | |
434 | struct dccp_service_list *sl = NULL; | |
435 | ||
8109b02b | 436 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
437 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
438 | return -EINVAL; | |
439 | ||
440 | if (optlen > sizeof(service)) { | |
441 | sl = kmalloc(optlen, GFP_KERNEL); | |
442 | if (sl == NULL) | |
443 | return -ENOMEM; | |
444 | ||
445 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
446 | if (copy_from_user(sl->dccpsl_list, | |
447 | optval + sizeof(service), | |
448 | optlen - sizeof(service)) || | |
449 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
450 | kfree(sl); | |
451 | return -EFAULT; | |
452 | } | |
453 | } | |
454 | ||
455 | lock_sock(sk); | |
456 | dp->dccps_service = service; | |
457 | ||
a51482bd | 458 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
459 | |
460 | dp->dccps_service_list = sl; | |
461 | release_sock(sk); | |
462 | return 0; | |
463 | } | |
464 | ||
afe00251 AB |
465 | /* byte 1 is feature. the rest is the preference list */ |
466 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
467 | struct dccp_so_feat __user *optval) | |
468 | { | |
469 | struct dccp_so_feat opt; | |
470 | u8 *val; | |
471 | int rc; | |
472 | ||
473 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
474 | return -EFAULT; | |
475 | ||
476 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
477 | if (!val) | |
478 | return -ENOMEM; | |
479 | ||
480 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
481 | rc = -EFAULT; | |
482 | goto out_free_val; | |
483 | } | |
484 | ||
8ca0d17b ACM |
485 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
486 | val, opt.dccpsf_len, GFP_KERNEL); | |
afe00251 AB |
487 | if (rc) |
488 | goto out_free_val; | |
489 | ||
490 | out: | |
491 | return rc; | |
492 | ||
493 | out_free_val: | |
494 | kfree(val); | |
495 | goto out; | |
496 | } | |
497 | ||
3fdadf7d DM |
498 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
499 | char __user *optval, int optlen) | |
7c657876 | 500 | { |
09dbc389 GR |
501 | struct dccp_sock *dp = dccp_sk(sk); |
502 | int val, err = 0; | |
7c657876 | 503 | |
a84ffe43 ACM |
504 | if (optlen < sizeof(int)) |
505 | return -EINVAL; | |
506 | ||
507 | if (get_user(val, (int __user *)optval)) | |
508 | return -EFAULT; | |
509 | ||
67e6b629 ACM |
510 | if (optname == DCCP_SOCKOPT_SERVICE) |
511 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 512 | |
67e6b629 | 513 | lock_sock(sk); |
a84ffe43 ACM |
514 | switch (optname) { |
515 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 516 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 517 | err = 0; |
a84ffe43 | 518 | break; |
afe00251 AB |
519 | case DCCP_SOCKOPT_CHANGE_L: |
520 | if (optlen != sizeof(struct dccp_so_feat)) | |
521 | err = -EINVAL; | |
522 | else | |
523 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
c9eaf173 | 524 | (struct dccp_so_feat __user *) |
afe00251 AB |
525 | optval); |
526 | break; | |
afe00251 AB |
527 | case DCCP_SOCKOPT_CHANGE_R: |
528 | if (optlen != sizeof(struct dccp_so_feat)) | |
529 | err = -EINVAL; | |
530 | else | |
531 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
9faefb6d | 532 | (struct dccp_so_feat __user *) |
afe00251 AB |
533 | optval); |
534 | break; | |
6f4e5fff GR |
535 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
536 | if (val < 0 || val > 15) | |
537 | err = -EINVAL; | |
538 | else | |
539 | dp->dccps_pcslen = val; | |
540 | break; | |
541 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ | |
542 | if (val < 0 || val > 15) | |
543 | err = -EINVAL; | |
544 | else { | |
545 | dp->dccps_pcrlen = val; | |
546 | /* FIXME: add feature negotiation, | |
547 | * ChangeL(MinimumChecksumCoverage, val) */ | |
548 | } | |
549 | break; | |
a84ffe43 ACM |
550 | default: |
551 | err = -ENOPROTOOPT; | |
552 | break; | |
553 | } | |
6f4e5fff | 554 | |
a84ffe43 ACM |
555 | release_sock(sk); |
556 | return err; | |
7c657876 ACM |
557 | } |
558 | ||
3fdadf7d DM |
559 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
560 | char __user *optval, int optlen) | |
561 | { | |
562 | if (level != SOL_DCCP) | |
563 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
564 | optname, optval, | |
565 | optlen); | |
566 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
567 | } | |
543d9cfe | 568 | |
f21e68ca ACM |
569 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
570 | ||
3fdadf7d DM |
571 | #ifdef CONFIG_COMPAT |
572 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 573 | char __user *optval, int optlen) |
3fdadf7d | 574 | { |
dec73ff0 ACM |
575 | if (level != SOL_DCCP) |
576 | return inet_csk_compat_setsockopt(sk, level, optname, | |
577 | optval, optlen); | |
3fdadf7d DM |
578 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
579 | } | |
543d9cfe | 580 | |
3fdadf7d DM |
581 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
582 | #endif | |
583 | ||
67e6b629 | 584 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 585 | __be32 __user *optval, |
67e6b629 ACM |
586 | int __user *optlen) |
587 | { | |
588 | const struct dccp_sock *dp = dccp_sk(sk); | |
589 | const struct dccp_service_list *sl; | |
590 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
591 | ||
592 | lock_sock(sk); | |
67e6b629 ACM |
593 | if ((sl = dp->dccps_service_list) != NULL) { |
594 | slen = sl->dccpsl_nr * sizeof(u32); | |
595 | total_len += slen; | |
596 | } | |
597 | ||
598 | err = -EINVAL; | |
599 | if (total_len > len) | |
600 | goto out; | |
601 | ||
602 | err = 0; | |
603 | if (put_user(total_len, optlen) || | |
604 | put_user(dp->dccps_service, optval) || | |
605 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
606 | err = -EFAULT; | |
607 | out: | |
608 | release_sock(sk); | |
609 | return err; | |
610 | } | |
611 | ||
3fdadf7d | 612 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 613 | char __user *optval, int __user *optlen) |
7c657876 | 614 | { |
a84ffe43 ACM |
615 | struct dccp_sock *dp; |
616 | int val, len; | |
7c657876 | 617 | |
a84ffe43 ACM |
618 | if (get_user(len, optlen)) |
619 | return -EFAULT; | |
620 | ||
39ebc027 | 621 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
622 | return -EINVAL; |
623 | ||
624 | dp = dccp_sk(sk); | |
625 | ||
626 | switch (optname) { | |
627 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 628 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 629 | return 0; |
88f964db ACM |
630 | case DCCP_SOCKOPT_SERVICE: |
631 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 632 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
633 | case DCCP_SOCKOPT_GET_CUR_MPS: |
634 | val = dp->dccps_mss_cache; | |
635 | len = sizeof(val); | |
636 | break; | |
6f4e5fff GR |
637 | case DCCP_SOCKOPT_SEND_CSCOV: |
638 | val = dp->dccps_pcslen; | |
39ebc027 | 639 | len = sizeof(val); |
6f4e5fff GR |
640 | break; |
641 | case DCCP_SOCKOPT_RECV_CSCOV: | |
642 | val = dp->dccps_pcrlen; | |
39ebc027 | 643 | len = sizeof(val); |
6f4e5fff | 644 | break; |
88f964db ACM |
645 | case 128 ... 191: |
646 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
647 | len, (u32 __user *)optval, optlen); | |
648 | case 192 ... 255: | |
649 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
650 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
651 | default: |
652 | return -ENOPROTOOPT; | |
653 | } | |
654 | ||
655 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
656 | return -EFAULT; | |
657 | ||
658 | return 0; | |
7c657876 ACM |
659 | } |
660 | ||
3fdadf7d DM |
661 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
662 | char __user *optval, int __user *optlen) | |
663 | { | |
664 | if (level != SOL_DCCP) | |
665 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
666 | optname, optval, | |
667 | optlen); | |
668 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
669 | } | |
543d9cfe | 670 | |
f21e68ca ACM |
671 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
672 | ||
3fdadf7d DM |
673 | #ifdef CONFIG_COMPAT |
674 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 675 | char __user *optval, int __user *optlen) |
3fdadf7d | 676 | { |
dec73ff0 ACM |
677 | if (level != SOL_DCCP) |
678 | return inet_csk_compat_getsockopt(sk, level, optname, | |
679 | optval, optlen); | |
3fdadf7d DM |
680 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
681 | } | |
543d9cfe | 682 | |
3fdadf7d DM |
683 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
684 | #endif | |
685 | ||
7c657876 ACM |
686 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
687 | size_t len) | |
688 | { | |
689 | const struct dccp_sock *dp = dccp_sk(sk); | |
690 | const int flags = msg->msg_flags; | |
691 | const int noblock = flags & MSG_DONTWAIT; | |
692 | struct sk_buff *skb; | |
693 | int rc, size; | |
694 | long timeo; | |
695 | ||
696 | if (len > dp->dccps_mss_cache) | |
697 | return -EMSGSIZE; | |
698 | ||
699 | lock_sock(sk); | |
b1308dc0 IM |
700 | |
701 | if (sysctl_dccp_tx_qlen && | |
702 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
703 | rc = -EAGAIN; | |
704 | goto out_release; | |
705 | } | |
706 | ||
27258ee5 | 707 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
708 | |
709 | /* | |
710 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
711 | * so that the trick in dccp_rcv_request_sent_state_process. | |
712 | */ | |
713 | /* Wait for a connection to finish. */ | |
cecd8d0e | 714 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 715 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 716 | goto out_release; |
7c657876 ACM |
717 | |
718 | size = sk->sk_prot->max_header + len; | |
719 | release_sock(sk); | |
720 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
721 | lock_sock(sk); | |
7c657876 ACM |
722 | if (skb == NULL) |
723 | goto out_release; | |
724 | ||
725 | skb_reserve(skb, sk->sk_prot->max_header); | |
726 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
727 | if (rc != 0) |
728 | goto out_discard; | |
729 | ||
97e5848d IM |
730 | skb_queue_tail(&sk->sk_write_queue, skb); |
731 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
732 | out_release: |
733 | release_sock(sk); | |
734 | return rc ? : len; | |
27258ee5 ACM |
735 | out_discard: |
736 | kfree_skb(skb); | |
7c657876 | 737 | goto out_release; |
7c657876 ACM |
738 | } |
739 | ||
f21e68ca ACM |
740 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
741 | ||
7c657876 ACM |
742 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
743 | size_t len, int nonblock, int flags, int *addr_len) | |
744 | { | |
745 | const struct dccp_hdr *dh; | |
7c657876 ACM |
746 | long timeo; |
747 | ||
748 | lock_sock(sk); | |
749 | ||
531669a0 ACM |
750 | if (sk->sk_state == DCCP_LISTEN) { |
751 | len = -ENOTCONN; | |
7c657876 | 752 | goto out; |
7c657876 | 753 | } |
7c657876 | 754 | |
531669a0 | 755 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
756 | |
757 | do { | |
531669a0 | 758 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 759 | |
531669a0 ACM |
760 | if (skb == NULL) |
761 | goto verify_sock_status; | |
7c657876 | 762 | |
531669a0 | 763 | dh = dccp_hdr(skb); |
7c657876 | 764 | |
531669a0 ACM |
765 | if (dh->dccph_type == DCCP_PKT_DATA || |
766 | dh->dccph_type == DCCP_PKT_DATAACK) | |
767 | goto found_ok_skb; | |
7c657876 | 768 | |
531669a0 ACM |
769 | if (dh->dccph_type == DCCP_PKT_RESET || |
770 | dh->dccph_type == DCCP_PKT_CLOSE) { | |
771 | dccp_pr_debug("found fin ok!\n"); | |
772 | len = 0; | |
773 | goto found_fin_ok; | |
774 | } | |
775 | dccp_pr_debug("packet_type=%s\n", | |
776 | dccp_packet_name(dh->dccph_type)); | |
624d1164 | 777 | sk_eat_skb(sk, skb, 0); |
531669a0 ACM |
778 | verify_sock_status: |
779 | if (sock_flag(sk, SOCK_DONE)) { | |
780 | len = 0; | |
7c657876 | 781 | break; |
531669a0 | 782 | } |
7c657876 | 783 | |
531669a0 ACM |
784 | if (sk->sk_err) { |
785 | len = sock_error(sk); | |
786 | break; | |
787 | } | |
7c657876 | 788 | |
531669a0 ACM |
789 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
790 | len = 0; | |
791 | break; | |
792 | } | |
7c657876 | 793 | |
531669a0 ACM |
794 | if (sk->sk_state == DCCP_CLOSED) { |
795 | if (!sock_flag(sk, SOCK_DONE)) { | |
796 | /* This occurs when user tries to read | |
797 | * from never connected socket. | |
798 | */ | |
799 | len = -ENOTCONN; | |
7c657876 ACM |
800 | break; |
801 | } | |
531669a0 ACM |
802 | len = 0; |
803 | break; | |
7c657876 ACM |
804 | } |
805 | ||
531669a0 ACM |
806 | if (!timeo) { |
807 | len = -EAGAIN; | |
808 | break; | |
809 | } | |
7c657876 | 810 | |
531669a0 ACM |
811 | if (signal_pending(current)) { |
812 | len = sock_intr_errno(timeo); | |
813 | break; | |
814 | } | |
7c657876 | 815 | |
531669a0 | 816 | sk_wait_data(sk, &timeo); |
7c657876 | 817 | continue; |
7c657876 | 818 | found_ok_skb: |
531669a0 ACM |
819 | if (len > skb->len) |
820 | len = skb->len; | |
821 | else if (len < skb->len) | |
822 | msg->msg_flags |= MSG_TRUNC; | |
823 | ||
824 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
825 | /* Exception. Bailout! */ | |
826 | len = -EFAULT; | |
827 | break; | |
7c657876 | 828 | } |
7c657876 ACM |
829 | found_fin_ok: |
830 | if (!(flags & MSG_PEEK)) | |
624d1164 | 831 | sk_eat_skb(sk, skb, 0); |
7c657876 | 832 | break; |
531669a0 | 833 | } while (1); |
7c657876 ACM |
834 | out: |
835 | release_sock(sk); | |
531669a0 | 836 | return len; |
7c657876 ACM |
837 | } |
838 | ||
f21e68ca ACM |
839 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
840 | ||
841 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
842 | { |
843 | struct sock *sk = sock->sk; | |
844 | unsigned char old_state; | |
845 | int err; | |
846 | ||
847 | lock_sock(sk); | |
848 | ||
849 | err = -EINVAL; | |
850 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
851 | goto out; | |
852 | ||
853 | old_state = sk->sk_state; | |
854 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
855 | goto out; | |
856 | ||
857 | /* Really, if the socket is already in listen state | |
858 | * we can only allow the backlog to be adjusted. | |
859 | */ | |
860 | if (old_state != DCCP_LISTEN) { | |
861 | /* | |
862 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
863 | * see tcp_listen_start | |
864 | */ | |
72a3effa | 865 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
866 | if (err) |
867 | goto out; | |
868 | } | |
869 | sk->sk_max_ack_backlog = backlog; | |
870 | err = 0; | |
871 | ||
872 | out: | |
873 | release_sock(sk); | |
874 | return err; | |
875 | } | |
876 | ||
f21e68ca ACM |
877 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
878 | ||
7c657876 | 879 | static const unsigned char dccp_new_state[] = { |
7690af3f ACM |
880 | /* current state: new state: action: */ |
881 | [0] = DCCP_CLOSED, | |
8109b02b | 882 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, |
7690af3f ACM |
883 | [DCCP_REQUESTING] = DCCP_CLOSED, |
884 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
885 | [DCCP_LISTEN] = DCCP_CLOSED, | |
886 | [DCCP_RESPOND] = DCCP_CLOSED, | |
887 | [DCCP_CLOSING] = DCCP_CLOSED, | |
888 | [DCCP_TIME_WAIT] = DCCP_CLOSED, | |
889 | [DCCP_CLOSED] = DCCP_CLOSED, | |
7c657876 ACM |
890 | }; |
891 | ||
892 | static int dccp_close_state(struct sock *sk) | |
893 | { | |
894 | const int next = dccp_new_state[sk->sk_state]; | |
895 | const int ns = next & DCCP_STATE_MASK; | |
896 | ||
897 | if (ns != sk->sk_state) | |
898 | dccp_set_state(sk, ns); | |
899 | ||
900 | return next & DCCP_ACTION_FIN; | |
901 | } | |
902 | ||
903 | void dccp_close(struct sock *sk, long timeout) | |
904 | { | |
97e5848d | 905 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 906 | struct sk_buff *skb; |
d83bd95b | 907 | u32 data_was_unread = 0; |
134af346 | 908 | int state; |
7c657876 ACM |
909 | |
910 | lock_sock(sk); | |
911 | ||
912 | sk->sk_shutdown = SHUTDOWN_MASK; | |
913 | ||
914 | if (sk->sk_state == DCCP_LISTEN) { | |
915 | dccp_set_state(sk, DCCP_CLOSED); | |
916 | ||
917 | /* Special case. */ | |
918 | inet_csk_listen_stop(sk); | |
919 | ||
920 | goto adjudge_to_death; | |
921 | } | |
922 | ||
97e5848d IM |
923 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
924 | ||
7c657876 ACM |
925 | /* |
926 | * We need to flush the recv. buffs. We do this only on the | |
927 | * descriptor close, not protocol-sourced closes, because the | |
928 | *reader process may not have drained the data yet! | |
929 | */ | |
7c657876 | 930 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 931 | data_was_unread += skb->len; |
7c657876 ACM |
932 | __kfree_skb(skb); |
933 | } | |
934 | ||
d83bd95b GR |
935 | if (data_was_unread) { |
936 | /* Unread data was tossed, send an appropriate Reset Code */ | |
937 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
938 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
939 | dccp_set_state(sk, DCCP_CLOSED); | |
940 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
941 | /* Check zero linger _after_ checking for unread data. */ |
942 | sk->sk_prot->disconnect(sk, 0); | |
943 | } else if (dccp_close_state(sk)) { | |
7ad07e7c | 944 | dccp_send_close(sk, 1); |
7c657876 ACM |
945 | } |
946 | ||
947 | sk_stream_wait_close(sk, timeout); | |
948 | ||
949 | adjudge_to_death: | |
134af346 HX |
950 | state = sk->sk_state; |
951 | sock_hold(sk); | |
952 | sock_orphan(sk); | |
953 | atomic_inc(sk->sk_prot->orphan_count); | |
954 | ||
7ad07e7c ACM |
955 | /* |
956 | * It is the last release_sock in its life. It will remove backlog. | |
957 | */ | |
7c657876 ACM |
958 | release_sock(sk); |
959 | /* | |
960 | * Now socket is owned by kernel and we acquire BH lock | |
961 | * to finish close. No need to check for user refs. | |
962 | */ | |
963 | local_bh_disable(); | |
964 | bh_lock_sock(sk); | |
965 | BUG_TRAP(!sock_owned_by_user(sk)); | |
966 | ||
134af346 HX |
967 | /* Have we already been destroyed by a softirq or backlog? */ |
968 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
969 | goto out; | |
7ad07e7c ACM |
970 | |
971 | /* | |
972 | * The last release_sock may have processed the CLOSE or RESET | |
973 | * packet moving sock to CLOSED state, if not we have to fire | |
974 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" | |
975 | * in draft-ietf-dccp-spec-11. -acme | |
976 | */ | |
977 | if (sk->sk_state == DCCP_CLOSING) { | |
978 | /* FIXME: should start at 2 * RTT */ | |
979 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ | |
980 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
981 | inet_csk(sk)->icsk_rto, | |
982 | DCCP_RTO_MAX); | |
983 | #if 0 | |
984 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ | |
7c657876 | 985 | dccp_set_state(sk, DCCP_CLOSED); |
7ad07e7c ACM |
986 | #endif |
987 | } | |
7c657876 | 988 | |
7c657876 ACM |
989 | if (sk->sk_state == DCCP_CLOSED) |
990 | inet_csk_destroy_sock(sk); | |
991 | ||
992 | /* Otherwise, socket is reprieved until protocol close. */ | |
993 | ||
134af346 | 994 | out: |
7c657876 ACM |
995 | bh_unlock_sock(sk); |
996 | local_bh_enable(); | |
997 | sock_put(sk); | |
998 | } | |
999 | ||
f21e68ca ACM |
1000 | EXPORT_SYMBOL_GPL(dccp_close); |
1001 | ||
7c657876 ACM |
1002 | void dccp_shutdown(struct sock *sk, int how) |
1003 | { | |
8e8c71f1 | 1004 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1005 | } |
1006 | ||
f21e68ca ACM |
1007 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1008 | ||
46f09ffa | 1009 | static int __init dccp_mib_init(void) |
7c657876 ACM |
1010 | { |
1011 | int rc = -ENOMEM; | |
1012 | ||
1013 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
1014 | if (dccp_statistics[0] == NULL) | |
1015 | goto out; | |
1016 | ||
1017 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
1018 | if (dccp_statistics[1] == NULL) | |
1019 | goto out_free_one; | |
1020 | ||
1021 | rc = 0; | |
1022 | out: | |
1023 | return rc; | |
1024 | out_free_one: | |
1025 | free_percpu(dccp_statistics[0]); | |
1026 | dccp_statistics[0] = NULL; | |
1027 | goto out; | |
1028 | ||
1029 | } | |
1030 | ||
b61fafc4 | 1031 | static void dccp_mib_exit(void) |
46f09ffa ACM |
1032 | { |
1033 | free_percpu(dccp_statistics[0]); | |
1034 | free_percpu(dccp_statistics[1]); | |
1035 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
1036 | } | |
1037 | ||
7c657876 ACM |
1038 | static int thash_entries; |
1039 | module_param(thash_entries, int, 0444); | |
1040 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1041 | ||
a1d3a355 | 1042 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1043 | int dccp_debug; |
042d18f9 | 1044 | module_param(dccp_debug, bool, 0444); |
7c657876 | 1045 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1046 | |
1047 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1048 | #endif |
7c657876 ACM |
1049 | |
1050 | static int __init dccp_init(void) | |
1051 | { | |
1052 | unsigned long goal; | |
1053 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1054 | int rc = -ENOBUFS; |
7c657876 | 1055 | |
7690af3f ACM |
1056 | dccp_hashinfo.bind_bucket_cachep = |
1057 | kmem_cache_create("dccp_bind_bucket", | |
1058 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1059 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1060 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1061 | goto out; |
7c657876 ACM |
1062 | |
1063 | /* | |
1064 | * Size and allocate the main established and bind bucket | |
1065 | * hash tables. | |
1066 | * | |
1067 | * The methodology is similar to that of the buffer cache. | |
1068 | */ | |
1069 | if (num_physpages >= (128 * 1024)) | |
1070 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1071 | else | |
1072 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1073 | ||
1074 | if (thash_entries) | |
7690af3f ACM |
1075 | goal = (thash_entries * |
1076 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1077 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1078 | ; | |
1079 | do { | |
1080 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1081 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1082 | while (dccp_hashinfo.ehash_size & |
1083 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1084 | dccp_hashinfo.ehash_size--; |
1085 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1086 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1087 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1088 | ||
1089 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1090 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1091 | goto out_free_bind_bucket_cachep; |
1092 | } | |
1093 | ||
dbca9b27 | 1094 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1095 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1096 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1097 | } |
1098 | ||
230140cf ED |
1099 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1100 | goto out_free_dccp_ehash; | |
1101 | ||
7c657876 ACM |
1102 | bhash_order = ehash_order; |
1103 | ||
1104 | do { | |
1105 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1106 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1107 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1108 | bhash_order > 0) | |
7c657876 ACM |
1109 | continue; |
1110 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1111 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1112 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1113 | ||
1114 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1115 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1116 | goto out_free_dccp_locks; |
7c657876 ACM |
1117 | } |
1118 | ||
1119 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1120 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1121 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1122 | } | |
1123 | ||
46f09ffa | 1124 | rc = dccp_mib_init(); |
fa23e2ec | 1125 | if (rc) |
7c657876 ACM |
1126 | goto out_free_dccp_bhash; |
1127 | ||
9b07ef5d | 1128 | rc = dccp_ackvec_init(); |
7c657876 | 1129 | if (rc) |
b61fafc4 | 1130 | goto out_free_dccp_mib; |
9b07ef5d | 1131 | |
e55d912f | 1132 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1133 | if (rc) |
1134 | goto out_ackvec_exit; | |
4c70f383 GR |
1135 | |
1136 | dccp_timestamping_init(); | |
7c657876 ACM |
1137 | out: |
1138 | return rc; | |
9b07ef5d ACM |
1139 | out_ackvec_exit: |
1140 | dccp_ackvec_exit(); | |
b61fafc4 | 1141 | out_free_dccp_mib: |
46f09ffa | 1142 | dccp_mib_exit(); |
7c657876 ACM |
1143 | out_free_dccp_bhash: |
1144 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1145 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1146 | out_free_dccp_locks: |
1147 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1148 | out_free_dccp_ehash: |
1149 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1150 | dccp_hashinfo.ehash = NULL; | |
1151 | out_free_bind_bucket_cachep: | |
1152 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1153 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1154 | goto out; |
1155 | } | |
1156 | ||
7c657876 ACM |
1157 | static void __exit dccp_fini(void) |
1158 | { | |
46f09ffa | 1159 | dccp_mib_exit(); |
725ba8ee ACM |
1160 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1161 | get_order(dccp_hashinfo.bhash_size * | |
1162 | sizeof(struct inet_bind_hashbucket))); | |
1163 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1164 | get_order(dccp_hashinfo.ehash_size * | |
1165 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1166 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1167 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1168 | dccp_ackvec_exit(); |
e55d912f | 1169 | dccp_sysctl_exit(); |
7c657876 ACM |
1170 | } |
1171 | ||
1172 | module_init(dccp_init); | |
1173 | module_exit(dccp_fini); | |
1174 | ||
7c657876 ACM |
1175 | MODULE_LICENSE("GPL"); |
1176 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1177 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |