Commit | Line | Data |
---|---|---|
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 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/dccp.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/in.h> | |
21 | #include <linux/if_arp.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/random.h> | |
24 | #include <net/checksum.h> | |
25 | ||
26 | #include <net/inet_common.h> | |
14c85021 | 27 | #include <net/inet_sock.h> |
7c657876 ACM |
28 | #include <net/protocol.h> |
29 | #include <net/sock.h> | |
30 | #include <net/xfrm.h> | |
31 | ||
32 | #include <asm/semaphore.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/timer.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/poll.h> | |
7c657876 ACM |
37 | |
38 | #include "ccid.h" | |
39 | #include "dccp.h" | |
afe00251 | 40 | #include "feat.h" |
7c657876 | 41 | |
ba89966c | 42 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 | 43 | |
f21e68ca ACM |
44 | EXPORT_SYMBOL_GPL(dccp_statistics); |
45 | ||
7c657876 ACM |
46 | atomic_t dccp_orphan_count = ATOMIC_INIT(0); |
47 | ||
f21e68ca ACM |
48 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
49 | ||
7c657876 ACM |
50 | static struct net_protocol dccp_protocol = { |
51 | .handler = dccp_v4_rcv, | |
52 | .err_handler = dccp_v4_err, | |
a516b049 | 53 | .no_policy = 1, |
7c657876 ACM |
54 | }; |
55 | ||
56 | const char *dccp_packet_name(const int type) | |
57 | { | |
58 | static const char *dccp_packet_names[] = { | |
59 | [DCCP_PKT_REQUEST] = "REQUEST", | |
60 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
61 | [DCCP_PKT_DATA] = "DATA", | |
62 | [DCCP_PKT_ACK] = "ACK", | |
63 | [DCCP_PKT_DATAACK] = "DATAACK", | |
64 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
65 | [DCCP_PKT_CLOSE] = "CLOSE", | |
66 | [DCCP_PKT_RESET] = "RESET", | |
67 | [DCCP_PKT_SYNC] = "SYNC", | |
68 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
69 | }; | |
70 | ||
71 | if (type >= DCCP_NR_PKT_TYPES) | |
72 | return "INVALID"; | |
73 | else | |
74 | return dccp_packet_names[type]; | |
75 | } | |
76 | ||
77 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
78 | ||
79 | const char *dccp_state_name(const int state) | |
80 | { | |
81 | static char *dccp_state_names[] = { | |
82 | [DCCP_OPEN] = "OPEN", | |
83 | [DCCP_REQUESTING] = "REQUESTING", | |
84 | [DCCP_PARTOPEN] = "PARTOPEN", | |
85 | [DCCP_LISTEN] = "LISTEN", | |
86 | [DCCP_RESPOND] = "RESPOND", | |
87 | [DCCP_CLOSING] = "CLOSING", | |
88 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
89 | [DCCP_CLOSED] = "CLOSED", | |
90 | }; | |
91 | ||
92 | if (state >= DCCP_MAX_STATES) | |
93 | return "INVALID STATE!"; | |
94 | else | |
95 | return dccp_state_names[state]; | |
96 | } | |
97 | ||
98 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
99 | ||
3e0fadc5 ACM |
100 | int dccp_init_sock(struct sock *sk) |
101 | { | |
102 | struct dccp_sock *dp = dccp_sk(sk); | |
103 | struct inet_connection_sock *icsk = inet_csk(sk); | |
104 | static int dccp_ctl_socket_init = 1; | |
105 | ||
106 | dccp_options_init(&dp->dccps_options); | |
107 | do_gettimeofday(&dp->dccps_epoch); | |
108 | ||
109 | /* | |
110 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
111 | * the listening (master) sock get CCID control blocks, which is not | |
112 | * necessary, but for now, to not mess with the test userspace apps, | |
113 | * lets leave it here, later the real solution is to do this in a | |
114 | * setsockopt(CCIDs-I-want/accept). -acme | |
115 | */ | |
116 | if (likely(!dccp_ctl_socket_init)) { | |
117 | int rc = dccp_feat_init(sk); | |
118 | ||
119 | if (rc) | |
120 | return rc; | |
121 | ||
122 | if (dp->dccps_options.dccpo_send_ack_vector) { | |
123 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); | |
124 | if (dp->dccps_hc_rx_ackvec == NULL) | |
125 | return -ENOMEM; | |
126 | } | |
127 | dp->dccps_hc_rx_ccid = | |
128 | ccid_hc_rx_new(dp->dccps_options.dccpo_rx_ccid, | |
129 | sk, GFP_KERNEL); | |
130 | dp->dccps_hc_tx_ccid = | |
131 | ccid_hc_tx_new(dp->dccps_options.dccpo_tx_ccid, | |
132 | sk, GFP_KERNEL); | |
133 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || | |
134 | dp->dccps_hc_tx_ccid == NULL)) { | |
135 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
136 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
137 | if (dp->dccps_options.dccpo_send_ack_vector) { | |
138 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); | |
139 | dp->dccps_hc_rx_ackvec = NULL; | |
140 | } | |
141 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
142 | return -ENOMEM; | |
143 | } | |
144 | } else { | |
145 | /* control socket doesn't need feat nego */ | |
146 | INIT_LIST_HEAD(&dp->dccps_options.dccpo_pending); | |
147 | INIT_LIST_HEAD(&dp->dccps_options.dccpo_conf); | |
148 | dccp_ctl_socket_init = 0; | |
149 | } | |
150 | ||
151 | dccp_init_xmit_timers(sk); | |
152 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; | |
153 | sk->sk_state = DCCP_CLOSED; | |
154 | sk->sk_write_space = dccp_write_space; | |
155 | icsk->icsk_sync_mss = dccp_sync_mss; | |
156 | dp->dccps_mss_cache = 536; | |
157 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
158 | dp->dccps_service = DCCP_SERVICE_INVALID_VALUE; | |
159 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
165 | ||
166 | int dccp_destroy_sock(struct sock *sk) | |
167 | { | |
168 | struct dccp_sock *dp = dccp_sk(sk); | |
169 | ||
170 | /* | |
171 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
172 | * for retransmissions | |
173 | */ | |
174 | if (sk->sk_send_head != NULL) { | |
175 | kfree_skb(sk->sk_send_head); | |
176 | sk->sk_send_head = NULL; | |
177 | } | |
178 | ||
179 | /* Clean up a referenced DCCP bind bucket. */ | |
180 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
181 | inet_put_port(&dccp_hashinfo, sk); | |
182 | ||
183 | kfree(dp->dccps_service_list); | |
184 | dp->dccps_service_list = NULL; | |
185 | ||
186 | if (dp->dccps_options.dccpo_send_ack_vector) { | |
187 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); | |
188 | dp->dccps_hc_rx_ackvec = NULL; | |
189 | } | |
190 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
191 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
192 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
193 | ||
194 | /* clean up feature negotiation state */ | |
195 | dccp_feat_clean(sk); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
201 | ||
7c657876 ACM |
202 | static inline int dccp_listen_start(struct sock *sk) |
203 | { | |
67e6b629 ACM |
204 | struct dccp_sock *dp = dccp_sk(sk); |
205 | ||
206 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
207 | /* | |
208 | * Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE) | |
209 | * before calling listen() | |
210 | */ | |
211 | if (dccp_service_not_initialized(sk)) | |
212 | return -EPROTO; | |
7c657876 ACM |
213 | return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); |
214 | } | |
215 | ||
216 | int dccp_disconnect(struct sock *sk, int flags) | |
217 | { | |
218 | struct inet_connection_sock *icsk = inet_csk(sk); | |
219 | struct inet_sock *inet = inet_sk(sk); | |
220 | int err = 0; | |
221 | const int old_state = sk->sk_state; | |
222 | ||
223 | if (old_state != DCCP_CLOSED) | |
224 | dccp_set_state(sk, DCCP_CLOSED); | |
225 | ||
226 | /* ABORT function of RFC793 */ | |
227 | if (old_state == DCCP_LISTEN) { | |
228 | inet_csk_listen_stop(sk); | |
229 | /* FIXME: do the active reset thing */ | |
230 | } else if (old_state == DCCP_REQUESTING) | |
231 | sk->sk_err = ECONNRESET; | |
232 | ||
233 | dccp_clear_xmit_timers(sk); | |
234 | __skb_queue_purge(&sk->sk_receive_queue); | |
235 | if (sk->sk_send_head != NULL) { | |
236 | __kfree_skb(sk->sk_send_head); | |
237 | sk->sk_send_head = NULL; | |
238 | } | |
239 | ||
240 | inet->dport = 0; | |
241 | ||
242 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
243 | inet_reset_saddr(sk); | |
244 | ||
245 | sk->sk_shutdown = 0; | |
246 | sock_reset_flag(sk, SOCK_DONE); | |
247 | ||
248 | icsk->icsk_backoff = 0; | |
249 | inet_csk_delack_init(sk); | |
250 | __sk_dst_reset(sk); | |
251 | ||
252 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
253 | ||
254 | sk->sk_error_report(sk); | |
255 | return err; | |
256 | } | |
257 | ||
f21e68ca ACM |
258 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
259 | ||
331968bd ACM |
260 | /* |
261 | * Wait for a DCCP event. | |
262 | * | |
263 | * Note that we don't need to lock the socket, as the upper poll layers | |
264 | * take care of normal races (between the test and the event) and we don't | |
265 | * go look at any of the socket buffers directly. | |
266 | */ | |
f21e68ca ACM |
267 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
268 | poll_table *wait) | |
331968bd ACM |
269 | { |
270 | unsigned int mask; | |
271 | struct sock *sk = sock->sk; | |
272 | ||
273 | poll_wait(file, sk->sk_sleep, wait); | |
274 | if (sk->sk_state == DCCP_LISTEN) | |
275 | return inet_csk_listen_poll(sk); | |
276 | ||
277 | /* Socket is not locked. We are protected from async events | |
278 | by poll logic and correct handling of state changes | |
279 | made by another threads is impossible in any case. | |
280 | */ | |
281 | ||
282 | mask = 0; | |
283 | if (sk->sk_err) | |
284 | mask = POLLERR; | |
285 | ||
286 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
287 | mask |= POLLHUP; | |
288 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
289 | mask |= POLLIN | POLLRDNORM; | |
290 | ||
291 | /* Connected? */ | |
292 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
293 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
294 | mask |= POLLIN | POLLRDNORM; | |
295 | ||
296 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
297 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
298 | mask |= POLLOUT | POLLWRNORM; | |
299 | } else { /* send SIGIO later */ | |
300 | set_bit(SOCK_ASYNC_NOSPACE, | |
301 | &sk->sk_socket->flags); | |
302 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
303 | ||
304 | /* Race breaker. If space is freed after | |
305 | * wspace test but before the flags are set, | |
306 | * IO signal will be lost. | |
307 | */ | |
308 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
309 | mask |= POLLOUT | POLLWRNORM; | |
310 | } | |
311 | } | |
312 | } | |
313 | return mask; | |
314 | } | |
315 | ||
f21e68ca ACM |
316 | EXPORT_SYMBOL_GPL(dccp_poll); |
317 | ||
7c657876 ACM |
318 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
319 | { | |
320 | dccp_pr_debug("entry\n"); | |
321 | return -ENOIOCTLCMD; | |
322 | } | |
323 | ||
f21e68ca ACM |
324 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
325 | ||
60fe62e7 | 326 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
327 | char __user *optval, int optlen) |
328 | { | |
329 | struct dccp_sock *dp = dccp_sk(sk); | |
330 | struct dccp_service_list *sl = NULL; | |
331 | ||
332 | if (service == DCCP_SERVICE_INVALID_VALUE || | |
333 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) | |
334 | return -EINVAL; | |
335 | ||
336 | if (optlen > sizeof(service)) { | |
337 | sl = kmalloc(optlen, GFP_KERNEL); | |
338 | if (sl == NULL) | |
339 | return -ENOMEM; | |
340 | ||
341 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
342 | if (copy_from_user(sl->dccpsl_list, | |
343 | optval + sizeof(service), | |
344 | optlen - sizeof(service)) || | |
345 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
346 | kfree(sl); | |
347 | return -EFAULT; | |
348 | } | |
349 | } | |
350 | ||
351 | lock_sock(sk); | |
352 | dp->dccps_service = service; | |
353 | ||
a51482bd | 354 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
355 | |
356 | dp->dccps_service_list = sl; | |
357 | release_sock(sk); | |
358 | return 0; | |
359 | } | |
360 | ||
afe00251 AB |
361 | /* byte 1 is feature. the rest is the preference list */ |
362 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
363 | struct dccp_so_feat __user *optval) | |
364 | { | |
365 | struct dccp_so_feat opt; | |
366 | u8 *val; | |
367 | int rc; | |
368 | ||
369 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
370 | return -EFAULT; | |
371 | ||
372 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
373 | if (!val) | |
374 | return -ENOMEM; | |
375 | ||
376 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
377 | rc = -EFAULT; | |
378 | goto out_free_val; | |
379 | } | |
380 | ||
381 | rc = dccp_feat_change(sk, type, opt.dccpsf_feat, val, opt.dccpsf_len, | |
382 | GFP_KERNEL); | |
383 | if (rc) | |
384 | goto out_free_val; | |
385 | ||
386 | out: | |
387 | return rc; | |
388 | ||
389 | out_free_val: | |
390 | kfree(val); | |
391 | goto out; | |
392 | } | |
393 | ||
7c657876 | 394 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 395 | char __user *optval, int optlen) |
7c657876 | 396 | { |
a84ffe43 ACM |
397 | struct dccp_sock *dp; |
398 | int err; | |
399 | int val; | |
7c657876 ACM |
400 | |
401 | if (level != SOL_DCCP) | |
57cca05a ACM |
402 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, |
403 | optname, optval, | |
404 | optlen); | |
7c657876 | 405 | |
a84ffe43 ACM |
406 | if (optlen < sizeof(int)) |
407 | return -EINVAL; | |
408 | ||
409 | if (get_user(val, (int __user *)optval)) | |
410 | return -EFAULT; | |
411 | ||
67e6b629 ACM |
412 | if (optname == DCCP_SOCKOPT_SERVICE) |
413 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 414 | |
67e6b629 | 415 | lock_sock(sk); |
a84ffe43 ACM |
416 | dp = dccp_sk(sk); |
417 | err = 0; | |
418 | ||
419 | switch (optname) { | |
420 | case DCCP_SOCKOPT_PACKET_SIZE: | |
421 | dp->dccps_packet_size = val; | |
422 | break; | |
afe00251 AB |
423 | |
424 | case DCCP_SOCKOPT_CHANGE_L: | |
425 | if (optlen != sizeof(struct dccp_so_feat)) | |
426 | err = -EINVAL; | |
427 | else | |
428 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
429 | (struct dccp_so_feat *) | |
430 | optval); | |
431 | break; | |
432 | ||
433 | case DCCP_SOCKOPT_CHANGE_R: | |
434 | if (optlen != sizeof(struct dccp_so_feat)) | |
435 | err = -EINVAL; | |
436 | else | |
437 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
438 | (struct dccp_so_feat *) | |
439 | optval); | |
440 | break; | |
441 | ||
a84ffe43 ACM |
442 | default: |
443 | err = -ENOPROTOOPT; | |
444 | break; | |
445 | } | |
446 | ||
447 | release_sock(sk); | |
448 | return err; | |
7c657876 ACM |
449 | } |
450 | ||
f21e68ca ACM |
451 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
452 | ||
67e6b629 | 453 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 454 | __be32 __user *optval, |
67e6b629 ACM |
455 | int __user *optlen) |
456 | { | |
457 | const struct dccp_sock *dp = dccp_sk(sk); | |
458 | const struct dccp_service_list *sl; | |
459 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
460 | ||
461 | lock_sock(sk); | |
462 | if (dccp_service_not_initialized(sk)) | |
463 | goto out; | |
464 | ||
465 | if ((sl = dp->dccps_service_list) != NULL) { | |
466 | slen = sl->dccpsl_nr * sizeof(u32); | |
467 | total_len += slen; | |
468 | } | |
469 | ||
470 | err = -EINVAL; | |
471 | if (total_len > len) | |
472 | goto out; | |
473 | ||
474 | err = 0; | |
475 | if (put_user(total_len, optlen) || | |
476 | put_user(dp->dccps_service, optval) || | |
477 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
478 | err = -EFAULT; | |
479 | out: | |
480 | release_sock(sk); | |
481 | return err; | |
482 | } | |
483 | ||
7c657876 | 484 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 485 | char __user *optval, int __user *optlen) |
7c657876 | 486 | { |
a84ffe43 ACM |
487 | struct dccp_sock *dp; |
488 | int val, len; | |
7c657876 ACM |
489 | |
490 | if (level != SOL_DCCP) | |
57cca05a ACM |
491 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, |
492 | optname, optval, | |
493 | optlen); | |
a84ffe43 ACM |
494 | if (get_user(len, optlen)) |
495 | return -EFAULT; | |
496 | ||
88f964db | 497 | if (len < sizeof(int)) |
a84ffe43 ACM |
498 | return -EINVAL; |
499 | ||
500 | dp = dccp_sk(sk); | |
501 | ||
502 | switch (optname) { | |
503 | case DCCP_SOCKOPT_PACKET_SIZE: | |
504 | val = dp->dccps_packet_size; | |
88f964db | 505 | len = sizeof(dp->dccps_packet_size); |
a84ffe43 | 506 | break; |
88f964db ACM |
507 | case DCCP_SOCKOPT_SERVICE: |
508 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 509 | (__be32 __user *)optval, optlen); |
88f964db ACM |
510 | case 128 ... 191: |
511 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
512 | len, (u32 __user *)optval, optlen); | |
513 | case 192 ... 255: | |
514 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
515 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
516 | default: |
517 | return -ENOPROTOOPT; | |
518 | } | |
519 | ||
520 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
521 | return -EFAULT; | |
522 | ||
523 | return 0; | |
7c657876 ACM |
524 | } |
525 | ||
f21e68ca ACM |
526 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
527 | ||
7c657876 ACM |
528 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
529 | size_t len) | |
530 | { | |
531 | const struct dccp_sock *dp = dccp_sk(sk); | |
532 | const int flags = msg->msg_flags; | |
533 | const int noblock = flags & MSG_DONTWAIT; | |
534 | struct sk_buff *skb; | |
535 | int rc, size; | |
536 | long timeo; | |
537 | ||
538 | if (len > dp->dccps_mss_cache) | |
539 | return -EMSGSIZE; | |
540 | ||
541 | lock_sock(sk); | |
27258ee5 | 542 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
543 | |
544 | /* | |
545 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
546 | * so that the trick in dccp_rcv_request_sent_state_process. | |
547 | */ | |
548 | /* Wait for a connection to finish. */ | |
549 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING)) | |
550 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) | |
27258ee5 | 551 | goto out_release; |
7c657876 ACM |
552 | |
553 | size = sk->sk_prot->max_header + len; | |
554 | release_sock(sk); | |
555 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
556 | lock_sock(sk); | |
7c657876 ACM |
557 | if (skb == NULL) |
558 | goto out_release; | |
559 | ||
560 | skb_reserve(skb, sk->sk_prot->max_header); | |
561 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
562 | if (rc != 0) |
563 | goto out_discard; | |
564 | ||
d6809c12 | 565 | rc = dccp_write_xmit(sk, skb, &timeo); |
20472af9 ACM |
566 | /* |
567 | * XXX we don't use sk_write_queue, so just discard the packet. | |
568 | * Current plan however is to _use_ sk_write_queue with | |
569 | * an algorith similar to tcp_sendmsg, where the main difference | |
570 | * is that in DCCP we have to respect packet boundaries, so | |
571 | * no coalescing of skbs. | |
572 | * | |
573 | * This bug was _quickly_ found & fixed by just looking at an OSTRA | |
574 | * generated callgraph 8) -acme | |
575 | */ | |
7c657876 ACM |
576 | out_release: |
577 | release_sock(sk); | |
578 | return rc ? : len; | |
27258ee5 ACM |
579 | out_discard: |
580 | kfree_skb(skb); | |
7c657876 | 581 | goto out_release; |
7c657876 ACM |
582 | } |
583 | ||
f21e68ca ACM |
584 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
585 | ||
7c657876 ACM |
586 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
587 | size_t len, int nonblock, int flags, int *addr_len) | |
588 | { | |
589 | const struct dccp_hdr *dh; | |
7c657876 ACM |
590 | long timeo; |
591 | ||
592 | lock_sock(sk); | |
593 | ||
531669a0 ACM |
594 | if (sk->sk_state == DCCP_LISTEN) { |
595 | len = -ENOTCONN; | |
7c657876 | 596 | goto out; |
7c657876 | 597 | } |
7c657876 | 598 | |
531669a0 | 599 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
600 | |
601 | do { | |
531669a0 | 602 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 603 | |
531669a0 ACM |
604 | if (skb == NULL) |
605 | goto verify_sock_status; | |
7c657876 | 606 | |
531669a0 | 607 | dh = dccp_hdr(skb); |
7c657876 | 608 | |
531669a0 ACM |
609 | if (dh->dccph_type == DCCP_PKT_DATA || |
610 | dh->dccph_type == DCCP_PKT_DATAACK) | |
611 | goto found_ok_skb; | |
7c657876 | 612 | |
531669a0 ACM |
613 | if (dh->dccph_type == DCCP_PKT_RESET || |
614 | dh->dccph_type == DCCP_PKT_CLOSE) { | |
615 | dccp_pr_debug("found fin ok!\n"); | |
616 | len = 0; | |
617 | goto found_fin_ok; | |
618 | } | |
619 | dccp_pr_debug("packet_type=%s\n", | |
620 | dccp_packet_name(dh->dccph_type)); | |
621 | sk_eat_skb(sk, skb); | |
622 | verify_sock_status: | |
623 | if (sock_flag(sk, SOCK_DONE)) { | |
624 | len = 0; | |
7c657876 | 625 | break; |
531669a0 | 626 | } |
7c657876 | 627 | |
531669a0 ACM |
628 | if (sk->sk_err) { |
629 | len = sock_error(sk); | |
630 | break; | |
631 | } | |
7c657876 | 632 | |
531669a0 ACM |
633 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
634 | len = 0; | |
635 | break; | |
636 | } | |
7c657876 | 637 | |
531669a0 ACM |
638 | if (sk->sk_state == DCCP_CLOSED) { |
639 | if (!sock_flag(sk, SOCK_DONE)) { | |
640 | /* This occurs when user tries to read | |
641 | * from never connected socket. | |
642 | */ | |
643 | len = -ENOTCONN; | |
7c657876 ACM |
644 | break; |
645 | } | |
531669a0 ACM |
646 | len = 0; |
647 | break; | |
7c657876 ACM |
648 | } |
649 | ||
531669a0 ACM |
650 | if (!timeo) { |
651 | len = -EAGAIN; | |
652 | break; | |
653 | } | |
7c657876 | 654 | |
531669a0 ACM |
655 | if (signal_pending(current)) { |
656 | len = sock_intr_errno(timeo); | |
657 | break; | |
658 | } | |
7c657876 | 659 | |
531669a0 | 660 | sk_wait_data(sk, &timeo); |
7c657876 | 661 | continue; |
7c657876 | 662 | found_ok_skb: |
531669a0 ACM |
663 | if (len > skb->len) |
664 | len = skb->len; | |
665 | else if (len < skb->len) | |
666 | msg->msg_flags |= MSG_TRUNC; | |
667 | ||
668 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
669 | /* Exception. Bailout! */ | |
670 | len = -EFAULT; | |
671 | break; | |
7c657876 | 672 | } |
7c657876 ACM |
673 | found_fin_ok: |
674 | if (!(flags & MSG_PEEK)) | |
675 | sk_eat_skb(sk, skb); | |
676 | break; | |
531669a0 | 677 | } while (1); |
7c657876 ACM |
678 | out: |
679 | release_sock(sk); | |
531669a0 | 680 | return len; |
7c657876 ACM |
681 | } |
682 | ||
f21e68ca ACM |
683 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
684 | ||
685 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
686 | { |
687 | struct sock *sk = sock->sk; | |
688 | unsigned char old_state; | |
689 | int err; | |
690 | ||
691 | lock_sock(sk); | |
692 | ||
693 | err = -EINVAL; | |
694 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
695 | goto out; | |
696 | ||
697 | old_state = sk->sk_state; | |
698 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
699 | goto out; | |
700 | ||
701 | /* Really, if the socket is already in listen state | |
702 | * we can only allow the backlog to be adjusted. | |
703 | */ | |
704 | if (old_state != DCCP_LISTEN) { | |
705 | /* | |
706 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
707 | * see tcp_listen_start | |
708 | */ | |
709 | err = dccp_listen_start(sk); | |
710 | if (err) | |
711 | goto out; | |
712 | } | |
713 | sk->sk_max_ack_backlog = backlog; | |
714 | err = 0; | |
715 | ||
716 | out: | |
717 | release_sock(sk); | |
718 | return err; | |
719 | } | |
720 | ||
f21e68ca ACM |
721 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
722 | ||
7c657876 | 723 | static const unsigned char dccp_new_state[] = { |
7690af3f ACM |
724 | /* current state: new state: action: */ |
725 | [0] = DCCP_CLOSED, | |
726 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
727 | [DCCP_REQUESTING] = DCCP_CLOSED, | |
728 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
729 | [DCCP_LISTEN] = DCCP_CLOSED, | |
730 | [DCCP_RESPOND] = DCCP_CLOSED, | |
731 | [DCCP_CLOSING] = DCCP_CLOSED, | |
732 | [DCCP_TIME_WAIT] = DCCP_CLOSED, | |
733 | [DCCP_CLOSED] = DCCP_CLOSED, | |
7c657876 ACM |
734 | }; |
735 | ||
736 | static int dccp_close_state(struct sock *sk) | |
737 | { | |
738 | const int next = dccp_new_state[sk->sk_state]; | |
739 | const int ns = next & DCCP_STATE_MASK; | |
740 | ||
741 | if (ns != sk->sk_state) | |
742 | dccp_set_state(sk, ns); | |
743 | ||
744 | return next & DCCP_ACTION_FIN; | |
745 | } | |
746 | ||
747 | void dccp_close(struct sock *sk, long timeout) | |
748 | { | |
749 | struct sk_buff *skb; | |
750 | ||
751 | lock_sock(sk); | |
752 | ||
753 | sk->sk_shutdown = SHUTDOWN_MASK; | |
754 | ||
755 | if (sk->sk_state == DCCP_LISTEN) { | |
756 | dccp_set_state(sk, DCCP_CLOSED); | |
757 | ||
758 | /* Special case. */ | |
759 | inet_csk_listen_stop(sk); | |
760 | ||
761 | goto adjudge_to_death; | |
762 | } | |
763 | ||
764 | /* | |
765 | * We need to flush the recv. buffs. We do this only on the | |
766 | * descriptor close, not protocol-sourced closes, because the | |
767 | *reader process may not have drained the data yet! | |
768 | */ | |
769 | /* FIXME: check for unread data */ | |
770 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
771 | __kfree_skb(skb); | |
772 | } | |
773 | ||
774 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
775 | /* Check zero linger _after_ checking for unread data. */ | |
776 | sk->sk_prot->disconnect(sk, 0); | |
777 | } else if (dccp_close_state(sk)) { | |
7ad07e7c | 778 | dccp_send_close(sk, 1); |
7c657876 ACM |
779 | } |
780 | ||
781 | sk_stream_wait_close(sk, timeout); | |
782 | ||
783 | adjudge_to_death: | |
7ad07e7c ACM |
784 | /* |
785 | * It is the last release_sock in its life. It will remove backlog. | |
786 | */ | |
7c657876 ACM |
787 | release_sock(sk); |
788 | /* | |
789 | * Now socket is owned by kernel and we acquire BH lock | |
790 | * to finish close. No need to check for user refs. | |
791 | */ | |
792 | local_bh_disable(); | |
793 | bh_lock_sock(sk); | |
794 | BUG_TRAP(!sock_owned_by_user(sk)); | |
795 | ||
796 | sock_hold(sk); | |
797 | sock_orphan(sk); | |
7ad07e7c ACM |
798 | |
799 | /* | |
800 | * The last release_sock may have processed the CLOSE or RESET | |
801 | * packet moving sock to CLOSED state, if not we have to fire | |
802 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" | |
803 | * in draft-ietf-dccp-spec-11. -acme | |
804 | */ | |
805 | if (sk->sk_state == DCCP_CLOSING) { | |
806 | /* FIXME: should start at 2 * RTT */ | |
807 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ | |
808 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
809 | inet_csk(sk)->icsk_rto, | |
810 | DCCP_RTO_MAX); | |
811 | #if 0 | |
812 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ | |
7c657876 | 813 | dccp_set_state(sk, DCCP_CLOSED); |
7ad07e7c ACM |
814 | #endif |
815 | } | |
7c657876 | 816 | |
7ad07e7c | 817 | atomic_inc(sk->sk_prot->orphan_count); |
7c657876 ACM |
818 | if (sk->sk_state == DCCP_CLOSED) |
819 | inet_csk_destroy_sock(sk); | |
820 | ||
821 | /* Otherwise, socket is reprieved until protocol close. */ | |
822 | ||
823 | bh_unlock_sock(sk); | |
824 | local_bh_enable(); | |
825 | sock_put(sk); | |
826 | } | |
827 | ||
f21e68ca ACM |
828 | EXPORT_SYMBOL_GPL(dccp_close); |
829 | ||
7c657876 ACM |
830 | void dccp_shutdown(struct sock *sk, int how) |
831 | { | |
832 | dccp_pr_debug("entry\n"); | |
833 | } | |
834 | ||
f21e68ca ACM |
835 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
836 | ||
90ddc4f0 | 837 | static const struct proto_ops inet_dccp_ops = { |
7c657876 ACM |
838 | .family = PF_INET, |
839 | .owner = THIS_MODULE, | |
840 | .release = inet_release, | |
841 | .bind = inet_bind, | |
842 | .connect = inet_stream_connect, | |
843 | .socketpair = sock_no_socketpair, | |
844 | .accept = inet_accept, | |
845 | .getname = inet_getname, | |
331968bd ACM |
846 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
847 | .poll = dccp_poll, | |
7c657876 | 848 | .ioctl = inet_ioctl, |
7690af3f ACM |
849 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
850 | .listen = inet_dccp_listen, | |
7c657876 ACM |
851 | .shutdown = inet_shutdown, |
852 | .setsockopt = sock_common_setsockopt, | |
853 | .getsockopt = sock_common_getsockopt, | |
854 | .sendmsg = inet_sendmsg, | |
855 | .recvmsg = sock_common_recvmsg, | |
856 | .mmap = sock_no_mmap, | |
857 | .sendpage = sock_no_sendpage, | |
858 | }; | |
859 | ||
860 | extern struct net_proto_family inet_family_ops; | |
861 | ||
862 | static struct inet_protosw dccp_v4_protosw = { | |
863 | .type = SOCK_DCCP, | |
864 | .protocol = IPPROTO_DCCP, | |
34ca6860 | 865 | .prot = &dccp_prot, |
7c657876 ACM |
866 | .ops = &inet_dccp_ops, |
867 | .capability = -1, | |
868 | .no_check = 0, | |
d83d8461 | 869 | .flags = INET_PROTOSW_ICSK, |
7c657876 ACM |
870 | }; |
871 | ||
872 | /* | |
873 | * This is the global socket data structure used for responding to | |
874 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
875 | * for this socket at the initialization time. | |
876 | */ | |
877 | struct socket *dccp_ctl_socket; | |
878 | ||
879 | static char dccp_ctl_socket_err_msg[] __initdata = | |
880 | KERN_ERR "DCCP: Failed to create the control socket.\n"; | |
881 | ||
882 | static int __init dccp_ctl_sock_init(void) | |
883 | { | |
884 | int rc = sock_create_kern(PF_INET, SOCK_DCCP, IPPROTO_DCCP, | |
885 | &dccp_ctl_socket); | |
886 | if (rc < 0) | |
887 | printk(dccp_ctl_socket_err_msg); | |
888 | else { | |
889 | dccp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; | |
890 | inet_sk(dccp_ctl_socket->sk)->uc_ttl = -1; | |
891 | ||
892 | /* Unhash it so that IP input processing does not even | |
893 | * see it, we do not wish this socket to see incoming | |
894 | * packets. | |
895 | */ | |
896 | dccp_ctl_socket->sk->sk_prot->unhash(dccp_ctl_socket->sk); | |
897 | } | |
898 | ||
899 | return rc; | |
900 | } | |
901 | ||
725ba8ee ACM |
902 | #ifdef CONFIG_IP_DCCP_UNLOAD_HACK |
903 | void dccp_ctl_sock_exit(void) | |
7c657876 | 904 | { |
5480855b | 905 | if (dccp_ctl_socket != NULL) { |
7c657876 | 906 | sock_release(dccp_ctl_socket); |
5480855b ACM |
907 | dccp_ctl_socket = NULL; |
908 | } | |
7c657876 ACM |
909 | } |
910 | ||
725ba8ee ACM |
911 | EXPORT_SYMBOL_GPL(dccp_ctl_sock_exit); |
912 | #endif | |
913 | ||
7c657876 ACM |
914 | static int __init init_dccp_v4_mibs(void) |
915 | { | |
916 | int rc = -ENOMEM; | |
917 | ||
918 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
919 | if (dccp_statistics[0] == NULL) | |
920 | goto out; | |
921 | ||
922 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
923 | if (dccp_statistics[1] == NULL) | |
924 | goto out_free_one; | |
925 | ||
926 | rc = 0; | |
927 | out: | |
928 | return rc; | |
929 | out_free_one: | |
930 | free_percpu(dccp_statistics[0]); | |
931 | dccp_statistics[0] = NULL; | |
932 | goto out; | |
933 | ||
934 | } | |
935 | ||
936 | static int thash_entries; | |
937 | module_param(thash_entries, int, 0444); | |
938 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
939 | ||
a1d3a355 | 940 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 ACM |
941 | int dccp_debug; |
942 | module_param(dccp_debug, int, 0444); | |
943 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); | |
f21e68ca ACM |
944 | |
945 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 946 | #endif |
7c657876 ACM |
947 | |
948 | static int __init dccp_init(void) | |
949 | { | |
950 | unsigned long goal; | |
951 | int ehash_order, bhash_order, i; | |
34ca6860 | 952 | int rc = proto_register(&dccp_prot, 1); |
7c657876 ACM |
953 | |
954 | if (rc) | |
955 | goto out; | |
956 | ||
fa23e2ec | 957 | rc = -ENOBUFS; |
7690af3f ACM |
958 | dccp_hashinfo.bind_bucket_cachep = |
959 | kmem_cache_create("dccp_bind_bucket", | |
960 | sizeof(struct inet_bind_bucket), 0, | |
961 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
7c657876 ACM |
962 | if (!dccp_hashinfo.bind_bucket_cachep) |
963 | goto out_proto_unregister; | |
964 | ||
965 | /* | |
966 | * Size and allocate the main established and bind bucket | |
967 | * hash tables. | |
968 | * | |
969 | * The methodology is similar to that of the buffer cache. | |
970 | */ | |
971 | if (num_physpages >= (128 * 1024)) | |
972 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
973 | else | |
974 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
975 | ||
976 | if (thash_entries) | |
7690af3f ACM |
977 | goal = (thash_entries * |
978 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
979 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
980 | ; | |
981 | do { | |
982 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
983 | sizeof(struct inet_ehash_bucket); | |
984 | dccp_hashinfo.ehash_size >>= 1; | |
7690af3f ACM |
985 | while (dccp_hashinfo.ehash_size & |
986 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
987 | dccp_hashinfo.ehash_size--; |
988 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
989 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
990 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
991 | ||
992 | if (!dccp_hashinfo.ehash) { | |
993 | printk(KERN_CRIT "Failed to allocate DCCP " | |
994 | "established hash table\n"); | |
995 | goto out_free_bind_bucket_cachep; | |
996 | } | |
997 | ||
998 | for (i = 0; i < (dccp_hashinfo.ehash_size << 1); i++) { | |
999 | rwlock_init(&dccp_hashinfo.ehash[i].lock); | |
1000 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); | |
1001 | } | |
1002 | ||
1003 | bhash_order = ehash_order; | |
1004 | ||
1005 | do { | |
1006 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1007 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1008 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1009 | bhash_order > 0) | |
7c657876 ACM |
1010 | continue; |
1011 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1012 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1013 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1014 | ||
1015 | if (!dccp_hashinfo.bhash) { | |
1016 | printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n"); | |
1017 | goto out_free_dccp_ehash; | |
1018 | } | |
1019 | ||
1020 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1021 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1022 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1023 | } | |
1024 | ||
fa23e2ec ACM |
1025 | rc = init_dccp_v4_mibs(); |
1026 | if (rc) | |
7c657876 ACM |
1027 | goto out_free_dccp_bhash; |
1028 | ||
1029 | rc = -EAGAIN; | |
1030 | if (inet_add_protocol(&dccp_protocol, IPPROTO_DCCP)) | |
1031 | goto out_free_dccp_v4_mibs; | |
1032 | ||
1033 | inet_register_protosw(&dccp_v4_protosw); | |
1034 | ||
9b07ef5d | 1035 | rc = dccp_ackvec_init(); |
7c657876 ACM |
1036 | if (rc) |
1037 | goto out_unregister_protosw; | |
9b07ef5d | 1038 | |
e55d912f | 1039 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1040 | if (rc) |
1041 | goto out_ackvec_exit; | |
e55d912f ACM |
1042 | |
1043 | rc = dccp_ctl_sock_init(); | |
1044 | if (rc) | |
1045 | goto out_sysctl_exit; | |
7c657876 ACM |
1046 | out: |
1047 | return rc; | |
e55d912f ACM |
1048 | out_sysctl_exit: |
1049 | dccp_sysctl_exit(); | |
9b07ef5d ACM |
1050 | out_ackvec_exit: |
1051 | dccp_ackvec_exit(); | |
7c657876 ACM |
1052 | out_unregister_protosw: |
1053 | inet_unregister_protosw(&dccp_v4_protosw); | |
1054 | inet_del_protocol(&dccp_protocol, IPPROTO_DCCP); | |
1055 | out_free_dccp_v4_mibs: | |
1056 | free_percpu(dccp_statistics[0]); | |
1057 | free_percpu(dccp_statistics[1]); | |
1058 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
1059 | out_free_dccp_bhash: | |
1060 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1061 | dccp_hashinfo.bhash = NULL; | |
1062 | out_free_dccp_ehash: | |
1063 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1064 | dccp_hashinfo.ehash = NULL; | |
1065 | out_free_bind_bucket_cachep: | |
1066 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1067 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
1068 | out_proto_unregister: | |
34ca6860 | 1069 | proto_unregister(&dccp_prot); |
7c657876 ACM |
1070 | goto out; |
1071 | } | |
1072 | ||
1073 | static const char dccp_del_proto_err_msg[] __exitdata = | |
1074 | KERN_ERR "can't remove dccp net_protocol\n"; | |
1075 | ||
1076 | static void __exit dccp_fini(void) | |
1077 | { | |
7c657876 ACM |
1078 | inet_unregister_protosw(&dccp_v4_protosw); |
1079 | ||
1080 | if (inet_del_protocol(&dccp_protocol, IPPROTO_DCCP) < 0) | |
1081 | printk(dccp_del_proto_err_msg); | |
1082 | ||
725ba8ee ACM |
1083 | free_percpu(dccp_statistics[0]); |
1084 | free_percpu(dccp_statistics[1]); | |
1085 | free_pages((unsigned long)dccp_hashinfo.bhash, | |
1086 | get_order(dccp_hashinfo.bhash_size * | |
1087 | sizeof(struct inet_bind_hashbucket))); | |
1088 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1089 | get_order(dccp_hashinfo.ehash_size * | |
1090 | sizeof(struct inet_ehash_bucket))); | |
7c657876 | 1091 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
34ca6860 | 1092 | proto_unregister(&dccp_prot); |
9b07ef5d | 1093 | dccp_ackvec_exit(); |
e55d912f | 1094 | dccp_sysctl_exit(); |
7c657876 ACM |
1095 | } |
1096 | ||
1097 | module_init(dccp_init); | |
1098 | module_exit(dccp_fini); | |
1099 | ||
bb97d31f ACM |
1100 | /* |
1101 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1102 | * values directly, Also cover the case where the protocol is not specified, | |
1103 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1104 | */ | |
1105 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
1106 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
7c657876 ACM |
1107 | MODULE_LICENSE("GPL"); |
1108 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1109 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |