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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 | ||
63 | dccp_pr_debug("%s(%p) %-10.10s -> %s\n", | |
64 | dccp_role(sk), sk, | |
65 | dccp_state_name(oldstate), dccp_state_name(state)); | |
66 | WARN_ON(state == oldstate); | |
67 | ||
68 | switch (state) { | |
69 | case DCCP_OPEN: | |
70 | if (oldstate != DCCP_OPEN) | |
71 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
72 | break; | |
73 | ||
74 | case DCCP_CLOSED: | |
75 | if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN) | |
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 | ||
96 | void dccp_done(struct sock *sk) | |
97 | { | |
98 | dccp_set_state(sk, DCCP_CLOSED); | |
99 | dccp_clear_xmit_timers(sk); | |
100 | ||
101 | sk->sk_shutdown = SHUTDOWN_MASK; | |
102 | ||
103 | if (!sock_flag(sk, SOCK_DEAD)) | |
104 | sk->sk_state_change(sk); | |
105 | else | |
106 | inet_csk_destroy_sock(sk); | |
107 | } | |
108 | ||
109 | EXPORT_SYMBOL_GPL(dccp_done); | |
110 | ||
7c657876 ACM |
111 | const char *dccp_packet_name(const int type) |
112 | { | |
113 | static const char *dccp_packet_names[] = { | |
114 | [DCCP_PKT_REQUEST] = "REQUEST", | |
115 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
116 | [DCCP_PKT_DATA] = "DATA", | |
117 | [DCCP_PKT_ACK] = "ACK", | |
118 | [DCCP_PKT_DATAACK] = "DATAACK", | |
119 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
120 | [DCCP_PKT_CLOSE] = "CLOSE", | |
121 | [DCCP_PKT_RESET] = "RESET", | |
122 | [DCCP_PKT_SYNC] = "SYNC", | |
123 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
124 | }; | |
125 | ||
126 | if (type >= DCCP_NR_PKT_TYPES) | |
127 | return "INVALID"; | |
128 | else | |
129 | return dccp_packet_names[type]; | |
130 | } | |
131 | ||
132 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
133 | ||
134 | const char *dccp_state_name(const int state) | |
135 | { | |
136 | static char *dccp_state_names[] = { | |
137 | [DCCP_OPEN] = "OPEN", | |
138 | [DCCP_REQUESTING] = "REQUESTING", | |
139 | [DCCP_PARTOPEN] = "PARTOPEN", | |
140 | [DCCP_LISTEN] = "LISTEN", | |
141 | [DCCP_RESPOND] = "RESPOND", | |
142 | [DCCP_CLOSING] = "CLOSING", | |
143 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
144 | [DCCP_CLOSED] = "CLOSED", | |
145 | }; | |
146 | ||
147 | if (state >= DCCP_MAX_STATES) | |
148 | return "INVALID STATE!"; | |
149 | else | |
150 | return dccp_state_names[state]; | |
151 | } | |
152 | ||
153 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
154 | ||
c985ed70 ACM |
155 | void dccp_hash(struct sock *sk) |
156 | { | |
157 | inet_hash(&dccp_hashinfo, sk); | |
158 | } | |
159 | ||
160 | EXPORT_SYMBOL_GPL(dccp_hash); | |
161 | ||
162 | void dccp_unhash(struct sock *sk) | |
163 | { | |
164 | inet_unhash(&dccp_hashinfo, sk); | |
165 | } | |
166 | ||
167 | EXPORT_SYMBOL_GPL(dccp_unhash); | |
168 | ||
72478873 | 169 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
170 | { |
171 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 172 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 | 173 | struct inet_connection_sock *icsk = inet_csk(sk); |
3e0fadc5 | 174 | |
a4bf3902 | 175 | dccp_minisock_init(&dp->dccps_minisock); |
3e0fadc5 | 176 | |
e18d7a98 ACM |
177 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
178 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
179 | sk->sk_state = DCCP_CLOSED; | |
180 | sk->sk_write_space = dccp_write_space; | |
181 | icsk->icsk_sync_mss = dccp_sync_mss; | |
182 | dp->dccps_mss_cache = 536; | |
183 | dp->dccps_rate_last = jiffies; | |
184 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
185 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
186 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; | |
187 | ||
188 | dccp_init_xmit_timers(sk); | |
189 | ||
3e0fadc5 ACM |
190 | /* |
191 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
192 | * the listening (master) sock get CCID control blocks, which is not | |
193 | * necessary, but for now, to not mess with the test userspace apps, | |
194 | * lets leave it here, later the real solution is to do this in a | |
195 | * setsockopt(CCIDs-I-want/accept). -acme | |
196 | */ | |
72478873 | 197 | if (likely(ctl_sock_initialized)) { |
8ca0d17b | 198 | int rc = dccp_feat_init(dmsk); |
3e0fadc5 ACM |
199 | |
200 | if (rc) | |
201 | return rc; | |
202 | ||
a4bf3902 | 203 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
204 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
205 | if (dp->dccps_hc_rx_ackvec == NULL) | |
206 | return -ENOMEM; | |
207 | } | |
a4bf3902 ACM |
208 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
209 | sk, GFP_KERNEL); | |
210 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
211 | sk, GFP_KERNEL); | |
8109b02b | 212 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
3e0fadc5 ACM |
213 | dp->dccps_hc_tx_ccid == NULL)) { |
214 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
215 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
a4bf3902 | 216 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
217 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
218 | dp->dccps_hc_rx_ackvec = NULL; | |
219 | } | |
220 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
221 | return -ENOMEM; | |
222 | } | |
223 | } else { | |
224 | /* control socket doesn't need feat nego */ | |
a4bf3902 ACM |
225 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
226 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
3e0fadc5 ACM |
227 | } |
228 | ||
3e0fadc5 ACM |
229 | return 0; |
230 | } | |
231 | ||
232 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
233 | ||
234 | int dccp_destroy_sock(struct sock *sk) | |
235 | { | |
236 | struct dccp_sock *dp = dccp_sk(sk); | |
8ca0d17b | 237 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
238 | |
239 | /* | |
240 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
241 | * for retransmissions | |
242 | */ | |
243 | if (sk->sk_send_head != NULL) { | |
244 | kfree_skb(sk->sk_send_head); | |
245 | sk->sk_send_head = NULL; | |
246 | } | |
247 | ||
248 | /* Clean up a referenced DCCP bind bucket. */ | |
249 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
250 | inet_put_port(&dccp_hashinfo, sk); | |
251 | ||
252 | kfree(dp->dccps_service_list); | |
253 | dp->dccps_service_list = NULL; | |
254 | ||
8ca0d17b | 255 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
256 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
257 | dp->dccps_hc_rx_ackvec = NULL; | |
258 | } | |
259 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
260 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
261 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
262 | ||
263 | /* clean up feature negotiation state */ | |
8ca0d17b | 264 | dccp_feat_clean(dmsk); |
3e0fadc5 ACM |
265 | |
266 | return 0; | |
267 | } | |
268 | ||
269 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
270 | ||
72a3effa | 271 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 272 | { |
67e6b629 ACM |
273 | struct dccp_sock *dp = dccp_sk(sk); |
274 | ||
275 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
72a3effa | 276 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
277 | } |
278 | ||
279 | int dccp_disconnect(struct sock *sk, int flags) | |
280 | { | |
281 | struct inet_connection_sock *icsk = inet_csk(sk); | |
282 | struct inet_sock *inet = inet_sk(sk); | |
283 | int err = 0; | |
284 | const int old_state = sk->sk_state; | |
285 | ||
286 | if (old_state != DCCP_CLOSED) | |
287 | dccp_set_state(sk, DCCP_CLOSED); | |
288 | ||
289 | /* ABORT function of RFC793 */ | |
290 | if (old_state == DCCP_LISTEN) { | |
291 | inet_csk_listen_stop(sk); | |
292 | /* FIXME: do the active reset thing */ | |
293 | } else if (old_state == DCCP_REQUESTING) | |
294 | sk->sk_err = ECONNRESET; | |
295 | ||
296 | dccp_clear_xmit_timers(sk); | |
297 | __skb_queue_purge(&sk->sk_receive_queue); | |
298 | if (sk->sk_send_head != NULL) { | |
299 | __kfree_skb(sk->sk_send_head); | |
300 | sk->sk_send_head = NULL; | |
301 | } | |
302 | ||
303 | inet->dport = 0; | |
304 | ||
305 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
306 | inet_reset_saddr(sk); | |
307 | ||
308 | sk->sk_shutdown = 0; | |
309 | sock_reset_flag(sk, SOCK_DONE); | |
310 | ||
311 | icsk->icsk_backoff = 0; | |
312 | inet_csk_delack_init(sk); | |
313 | __sk_dst_reset(sk); | |
314 | ||
315 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
316 | ||
317 | sk->sk_error_report(sk); | |
318 | return err; | |
319 | } | |
320 | ||
f21e68ca ACM |
321 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
322 | ||
331968bd ACM |
323 | /* |
324 | * Wait for a DCCP event. | |
325 | * | |
326 | * Note that we don't need to lock the socket, as the upper poll layers | |
327 | * take care of normal races (between the test and the event) and we don't | |
328 | * go look at any of the socket buffers directly. | |
329 | */ | |
f21e68ca ACM |
330 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
331 | poll_table *wait) | |
331968bd ACM |
332 | { |
333 | unsigned int mask; | |
334 | struct sock *sk = sock->sk; | |
335 | ||
336 | poll_wait(file, sk->sk_sleep, wait); | |
337 | if (sk->sk_state == DCCP_LISTEN) | |
338 | return inet_csk_listen_poll(sk); | |
339 | ||
340 | /* Socket is not locked. We are protected from async events | |
341 | by poll logic and correct handling of state changes | |
342 | made by another threads is impossible in any case. | |
343 | */ | |
344 | ||
345 | mask = 0; | |
346 | if (sk->sk_err) | |
347 | mask = POLLERR; | |
348 | ||
349 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
350 | mask |= POLLHUP; | |
351 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 352 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
353 | |
354 | /* Connected? */ | |
355 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
356 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
357 | mask |= POLLIN | POLLRDNORM; | |
358 | ||
359 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
360 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
361 | mask |= POLLOUT | POLLWRNORM; | |
362 | } else { /* send SIGIO later */ | |
363 | set_bit(SOCK_ASYNC_NOSPACE, | |
364 | &sk->sk_socket->flags); | |
365 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
366 | ||
367 | /* Race breaker. If space is freed after | |
368 | * wspace test but before the flags are set, | |
369 | * IO signal will be lost. | |
370 | */ | |
371 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
372 | mask |= POLLOUT | POLLWRNORM; | |
373 | } | |
374 | } | |
375 | } | |
376 | return mask; | |
377 | } | |
378 | ||
f21e68ca ACM |
379 | EXPORT_SYMBOL_GPL(dccp_poll); |
380 | ||
7c657876 ACM |
381 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
382 | { | |
6273172e ACM |
383 | int rc = -ENOTCONN; |
384 | ||
385 | lock_sock(sk); | |
386 | ||
387 | if (sk->sk_state == DCCP_LISTEN) | |
388 | goto out; | |
389 | ||
390 | switch (cmd) { | |
391 | case SIOCINQ: { | |
392 | struct sk_buff *skb; | |
393 | unsigned long amount = 0; | |
394 | ||
395 | skb = skb_peek(&sk->sk_receive_queue); | |
396 | if (skb != NULL) { | |
397 | /* | |
398 | * We will only return the amount of this packet since | |
399 | * that is all that will be read. | |
400 | */ | |
401 | amount = skb->len; | |
402 | } | |
403 | rc = put_user(amount, (int __user *)arg); | |
404 | } | |
405 | break; | |
406 | default: | |
407 | rc = -ENOIOCTLCMD; | |
408 | break; | |
409 | } | |
410 | out: | |
411 | release_sock(sk); | |
412 | return rc; | |
7c657876 ACM |
413 | } |
414 | ||
f21e68ca ACM |
415 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
416 | ||
60fe62e7 | 417 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
418 | char __user *optval, int optlen) |
419 | { | |
420 | struct dccp_sock *dp = dccp_sk(sk); | |
421 | struct dccp_service_list *sl = NULL; | |
422 | ||
8109b02b | 423 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
424 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
425 | return -EINVAL; | |
426 | ||
427 | if (optlen > sizeof(service)) { | |
428 | sl = kmalloc(optlen, GFP_KERNEL); | |
429 | if (sl == NULL) | |
430 | return -ENOMEM; | |
431 | ||
432 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
433 | if (copy_from_user(sl->dccpsl_list, | |
434 | optval + sizeof(service), | |
435 | optlen - sizeof(service)) || | |
436 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
437 | kfree(sl); | |
438 | return -EFAULT; | |
439 | } | |
440 | } | |
441 | ||
442 | lock_sock(sk); | |
443 | dp->dccps_service = service; | |
444 | ||
a51482bd | 445 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
446 | |
447 | dp->dccps_service_list = sl; | |
448 | release_sock(sk); | |
449 | return 0; | |
450 | } | |
451 | ||
afe00251 AB |
452 | /* byte 1 is feature. the rest is the preference list */ |
453 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
454 | struct dccp_so_feat __user *optval) | |
455 | { | |
456 | struct dccp_so_feat opt; | |
457 | u8 *val; | |
458 | int rc; | |
459 | ||
460 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
461 | return -EFAULT; | |
462 | ||
463 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
464 | if (!val) | |
465 | return -ENOMEM; | |
466 | ||
467 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
468 | rc = -EFAULT; | |
469 | goto out_free_val; | |
470 | } | |
471 | ||
8ca0d17b ACM |
472 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
473 | val, opt.dccpsf_len, GFP_KERNEL); | |
afe00251 AB |
474 | if (rc) |
475 | goto out_free_val; | |
476 | ||
477 | out: | |
478 | return rc; | |
479 | ||
480 | out_free_val: | |
481 | kfree(val); | |
482 | goto out; | |
483 | } | |
484 | ||
3fdadf7d DM |
485 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
486 | char __user *optval, int optlen) | |
7c657876 | 487 | { |
09dbc389 GR |
488 | struct dccp_sock *dp = dccp_sk(sk); |
489 | int val, err = 0; | |
7c657876 | 490 | |
a84ffe43 ACM |
491 | if (optlen < sizeof(int)) |
492 | return -EINVAL; | |
493 | ||
494 | if (get_user(val, (int __user *)optval)) | |
495 | return -EFAULT; | |
496 | ||
67e6b629 ACM |
497 | if (optname == DCCP_SOCKOPT_SERVICE) |
498 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 499 | |
67e6b629 | 500 | lock_sock(sk); |
a84ffe43 ACM |
501 | switch (optname) { |
502 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 503 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 504 | err = 0; |
a84ffe43 | 505 | break; |
afe00251 AB |
506 | case DCCP_SOCKOPT_CHANGE_L: |
507 | if (optlen != sizeof(struct dccp_so_feat)) | |
508 | err = -EINVAL; | |
509 | else | |
510 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
c9eaf173 | 511 | (struct dccp_so_feat __user *) |
afe00251 AB |
512 | optval); |
513 | break; | |
afe00251 AB |
514 | case DCCP_SOCKOPT_CHANGE_R: |
515 | if (optlen != sizeof(struct dccp_so_feat)) | |
516 | err = -EINVAL; | |
517 | else | |
518 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
9faefb6d | 519 | (struct dccp_so_feat __user *) |
afe00251 AB |
520 | optval); |
521 | break; | |
6f4e5fff GR |
522 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
523 | if (val < 0 || val > 15) | |
524 | err = -EINVAL; | |
525 | else | |
526 | dp->dccps_pcslen = val; | |
527 | break; | |
528 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ | |
529 | if (val < 0 || val > 15) | |
530 | err = -EINVAL; | |
531 | else { | |
532 | dp->dccps_pcrlen = val; | |
533 | /* FIXME: add feature negotiation, | |
534 | * ChangeL(MinimumChecksumCoverage, val) */ | |
535 | } | |
536 | break; | |
a84ffe43 ACM |
537 | default: |
538 | err = -ENOPROTOOPT; | |
539 | break; | |
540 | } | |
6f4e5fff | 541 | |
a84ffe43 ACM |
542 | release_sock(sk); |
543 | return err; | |
7c657876 ACM |
544 | } |
545 | ||
3fdadf7d DM |
546 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
547 | char __user *optval, int optlen) | |
548 | { | |
549 | if (level != SOL_DCCP) | |
550 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
551 | optname, optval, | |
552 | optlen); | |
553 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
554 | } | |
543d9cfe | 555 | |
f21e68ca ACM |
556 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
557 | ||
3fdadf7d DM |
558 | #ifdef CONFIG_COMPAT |
559 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 560 | char __user *optval, int optlen) |
3fdadf7d | 561 | { |
dec73ff0 ACM |
562 | if (level != SOL_DCCP) |
563 | return inet_csk_compat_setsockopt(sk, level, optname, | |
564 | optval, optlen); | |
3fdadf7d DM |
565 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
566 | } | |
543d9cfe | 567 | |
3fdadf7d DM |
568 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
569 | #endif | |
570 | ||
67e6b629 | 571 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 572 | __be32 __user *optval, |
67e6b629 ACM |
573 | int __user *optlen) |
574 | { | |
575 | const struct dccp_sock *dp = dccp_sk(sk); | |
576 | const struct dccp_service_list *sl; | |
577 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
578 | ||
579 | lock_sock(sk); | |
67e6b629 ACM |
580 | if ((sl = dp->dccps_service_list) != NULL) { |
581 | slen = sl->dccpsl_nr * sizeof(u32); | |
582 | total_len += slen; | |
583 | } | |
584 | ||
585 | err = -EINVAL; | |
586 | if (total_len > len) | |
587 | goto out; | |
588 | ||
589 | err = 0; | |
590 | if (put_user(total_len, optlen) || | |
591 | put_user(dp->dccps_service, optval) || | |
592 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
593 | err = -EFAULT; | |
594 | out: | |
595 | release_sock(sk); | |
596 | return err; | |
597 | } | |
598 | ||
3fdadf7d | 599 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 600 | char __user *optval, int __user *optlen) |
7c657876 | 601 | { |
a84ffe43 ACM |
602 | struct dccp_sock *dp; |
603 | int val, len; | |
7c657876 | 604 | |
a84ffe43 ACM |
605 | if (get_user(len, optlen)) |
606 | return -EFAULT; | |
607 | ||
39ebc027 | 608 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
609 | return -EINVAL; |
610 | ||
611 | dp = dccp_sk(sk); | |
612 | ||
613 | switch (optname) { | |
614 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 615 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 616 | return 0; |
88f964db ACM |
617 | case DCCP_SOCKOPT_SERVICE: |
618 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 619 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
620 | case DCCP_SOCKOPT_GET_CUR_MPS: |
621 | val = dp->dccps_mss_cache; | |
622 | len = sizeof(val); | |
623 | break; | |
6f4e5fff GR |
624 | case DCCP_SOCKOPT_SEND_CSCOV: |
625 | val = dp->dccps_pcslen; | |
39ebc027 | 626 | len = sizeof(val); |
6f4e5fff GR |
627 | break; |
628 | case DCCP_SOCKOPT_RECV_CSCOV: | |
629 | val = dp->dccps_pcrlen; | |
39ebc027 | 630 | len = sizeof(val); |
6f4e5fff | 631 | break; |
88f964db ACM |
632 | case 128 ... 191: |
633 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
634 | len, (u32 __user *)optval, optlen); | |
635 | case 192 ... 255: | |
636 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
637 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
638 | default: |
639 | return -ENOPROTOOPT; | |
640 | } | |
641 | ||
642 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
643 | return -EFAULT; | |
644 | ||
645 | return 0; | |
7c657876 ACM |
646 | } |
647 | ||
3fdadf7d DM |
648 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
649 | char __user *optval, int __user *optlen) | |
650 | { | |
651 | if (level != SOL_DCCP) | |
652 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
653 | optname, optval, | |
654 | optlen); | |
655 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
656 | } | |
543d9cfe | 657 | |
f21e68ca ACM |
658 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
659 | ||
3fdadf7d DM |
660 | #ifdef CONFIG_COMPAT |
661 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 662 | char __user *optval, int __user *optlen) |
3fdadf7d | 663 | { |
dec73ff0 ACM |
664 | if (level != SOL_DCCP) |
665 | return inet_csk_compat_getsockopt(sk, level, optname, | |
666 | optval, optlen); | |
3fdadf7d DM |
667 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
668 | } | |
543d9cfe | 669 | |
3fdadf7d DM |
670 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
671 | #endif | |
672 | ||
7c657876 ACM |
673 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
674 | size_t len) | |
675 | { | |
676 | const struct dccp_sock *dp = dccp_sk(sk); | |
677 | const int flags = msg->msg_flags; | |
678 | const int noblock = flags & MSG_DONTWAIT; | |
679 | struct sk_buff *skb; | |
680 | int rc, size; | |
681 | long timeo; | |
682 | ||
683 | if (len > dp->dccps_mss_cache) | |
684 | return -EMSGSIZE; | |
685 | ||
686 | lock_sock(sk); | |
b1308dc0 IM |
687 | |
688 | if (sysctl_dccp_tx_qlen && | |
689 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
690 | rc = -EAGAIN; | |
691 | goto out_release; | |
692 | } | |
693 | ||
27258ee5 | 694 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
695 | |
696 | /* | |
697 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
698 | * so that the trick in dccp_rcv_request_sent_state_process. | |
699 | */ | |
700 | /* Wait for a connection to finish. */ | |
cecd8d0e | 701 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 702 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 703 | goto out_release; |
7c657876 ACM |
704 | |
705 | size = sk->sk_prot->max_header + len; | |
706 | release_sock(sk); | |
707 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
708 | lock_sock(sk); | |
7c657876 ACM |
709 | if (skb == NULL) |
710 | goto out_release; | |
711 | ||
712 | skb_reserve(skb, sk->sk_prot->max_header); | |
713 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
714 | if (rc != 0) |
715 | goto out_discard; | |
716 | ||
97e5848d IM |
717 | skb_queue_tail(&sk->sk_write_queue, skb); |
718 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
719 | out_release: |
720 | release_sock(sk); | |
721 | return rc ? : len; | |
27258ee5 ACM |
722 | out_discard: |
723 | kfree_skb(skb); | |
7c657876 | 724 | goto out_release; |
7c657876 ACM |
725 | } |
726 | ||
f21e68ca ACM |
727 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
728 | ||
7c657876 ACM |
729 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
730 | size_t len, int nonblock, int flags, int *addr_len) | |
731 | { | |
732 | const struct dccp_hdr *dh; | |
7c657876 ACM |
733 | long timeo; |
734 | ||
735 | lock_sock(sk); | |
736 | ||
531669a0 ACM |
737 | if (sk->sk_state == DCCP_LISTEN) { |
738 | len = -ENOTCONN; | |
7c657876 | 739 | goto out; |
7c657876 | 740 | } |
7c657876 | 741 | |
531669a0 | 742 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
743 | |
744 | do { | |
531669a0 | 745 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 746 | |
531669a0 ACM |
747 | if (skb == NULL) |
748 | goto verify_sock_status; | |
7c657876 | 749 | |
531669a0 | 750 | dh = dccp_hdr(skb); |
7c657876 | 751 | |
531669a0 ACM |
752 | if (dh->dccph_type == DCCP_PKT_DATA || |
753 | dh->dccph_type == DCCP_PKT_DATAACK) | |
754 | goto found_ok_skb; | |
7c657876 | 755 | |
531669a0 ACM |
756 | if (dh->dccph_type == DCCP_PKT_RESET || |
757 | dh->dccph_type == DCCP_PKT_CLOSE) { | |
758 | dccp_pr_debug("found fin ok!\n"); | |
759 | len = 0; | |
760 | goto found_fin_ok; | |
761 | } | |
762 | dccp_pr_debug("packet_type=%s\n", | |
763 | dccp_packet_name(dh->dccph_type)); | |
624d1164 | 764 | sk_eat_skb(sk, skb, 0); |
531669a0 ACM |
765 | verify_sock_status: |
766 | if (sock_flag(sk, SOCK_DONE)) { | |
767 | len = 0; | |
7c657876 | 768 | break; |
531669a0 | 769 | } |
7c657876 | 770 | |
531669a0 ACM |
771 | if (sk->sk_err) { |
772 | len = sock_error(sk); | |
773 | break; | |
774 | } | |
7c657876 | 775 | |
531669a0 ACM |
776 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
777 | len = 0; | |
778 | break; | |
779 | } | |
7c657876 | 780 | |
531669a0 ACM |
781 | if (sk->sk_state == DCCP_CLOSED) { |
782 | if (!sock_flag(sk, SOCK_DONE)) { | |
783 | /* This occurs when user tries to read | |
784 | * from never connected socket. | |
785 | */ | |
786 | len = -ENOTCONN; | |
7c657876 ACM |
787 | break; |
788 | } | |
531669a0 ACM |
789 | len = 0; |
790 | break; | |
7c657876 ACM |
791 | } |
792 | ||
531669a0 ACM |
793 | if (!timeo) { |
794 | len = -EAGAIN; | |
795 | break; | |
796 | } | |
7c657876 | 797 | |
531669a0 ACM |
798 | if (signal_pending(current)) { |
799 | len = sock_intr_errno(timeo); | |
800 | break; | |
801 | } | |
7c657876 | 802 | |
531669a0 | 803 | sk_wait_data(sk, &timeo); |
7c657876 | 804 | continue; |
7c657876 | 805 | found_ok_skb: |
531669a0 ACM |
806 | if (len > skb->len) |
807 | len = skb->len; | |
808 | else if (len < skb->len) | |
809 | msg->msg_flags |= MSG_TRUNC; | |
810 | ||
811 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
812 | /* Exception. Bailout! */ | |
813 | len = -EFAULT; | |
814 | break; | |
7c657876 | 815 | } |
7c657876 ACM |
816 | found_fin_ok: |
817 | if (!(flags & MSG_PEEK)) | |
624d1164 | 818 | sk_eat_skb(sk, skb, 0); |
7c657876 | 819 | break; |
531669a0 | 820 | } while (1); |
7c657876 ACM |
821 | out: |
822 | release_sock(sk); | |
531669a0 | 823 | return len; |
7c657876 ACM |
824 | } |
825 | ||
f21e68ca ACM |
826 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
827 | ||
828 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
829 | { |
830 | struct sock *sk = sock->sk; | |
831 | unsigned char old_state; | |
832 | int err; | |
833 | ||
834 | lock_sock(sk); | |
835 | ||
836 | err = -EINVAL; | |
837 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
838 | goto out; | |
839 | ||
840 | old_state = sk->sk_state; | |
841 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
842 | goto out; | |
843 | ||
844 | /* Really, if the socket is already in listen state | |
845 | * we can only allow the backlog to be adjusted. | |
846 | */ | |
847 | if (old_state != DCCP_LISTEN) { | |
848 | /* | |
849 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
850 | * see tcp_listen_start | |
851 | */ | |
72a3effa | 852 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
853 | if (err) |
854 | goto out; | |
855 | } | |
856 | sk->sk_max_ack_backlog = backlog; | |
857 | err = 0; | |
858 | ||
859 | out: | |
860 | release_sock(sk); | |
861 | return err; | |
862 | } | |
863 | ||
f21e68ca ACM |
864 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
865 | ||
7c657876 | 866 | static const unsigned char dccp_new_state[] = { |
7690af3f ACM |
867 | /* current state: new state: action: */ |
868 | [0] = DCCP_CLOSED, | |
8109b02b | 869 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, |
7690af3f ACM |
870 | [DCCP_REQUESTING] = DCCP_CLOSED, |
871 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
872 | [DCCP_LISTEN] = DCCP_CLOSED, | |
873 | [DCCP_RESPOND] = DCCP_CLOSED, | |
874 | [DCCP_CLOSING] = DCCP_CLOSED, | |
875 | [DCCP_TIME_WAIT] = DCCP_CLOSED, | |
876 | [DCCP_CLOSED] = DCCP_CLOSED, | |
7c657876 ACM |
877 | }; |
878 | ||
879 | static int dccp_close_state(struct sock *sk) | |
880 | { | |
881 | const int next = dccp_new_state[sk->sk_state]; | |
882 | const int ns = next & DCCP_STATE_MASK; | |
883 | ||
884 | if (ns != sk->sk_state) | |
885 | dccp_set_state(sk, ns); | |
886 | ||
887 | return next & DCCP_ACTION_FIN; | |
888 | } | |
889 | ||
890 | void dccp_close(struct sock *sk, long timeout) | |
891 | { | |
97e5848d | 892 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 893 | struct sk_buff *skb; |
134af346 | 894 | int state; |
7c657876 ACM |
895 | |
896 | lock_sock(sk); | |
897 | ||
898 | sk->sk_shutdown = SHUTDOWN_MASK; | |
899 | ||
900 | if (sk->sk_state == DCCP_LISTEN) { | |
901 | dccp_set_state(sk, DCCP_CLOSED); | |
902 | ||
903 | /* Special case. */ | |
904 | inet_csk_listen_stop(sk); | |
905 | ||
906 | goto adjudge_to_death; | |
907 | } | |
908 | ||
97e5848d IM |
909 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
910 | ||
7c657876 ACM |
911 | /* |
912 | * We need to flush the recv. buffs. We do this only on the | |
913 | * descriptor close, not protocol-sourced closes, because the | |
914 | *reader process may not have drained the data yet! | |
915 | */ | |
916 | /* FIXME: check for unread data */ | |
917 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
918 | __kfree_skb(skb); | |
919 | } | |
920 | ||
921 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
922 | /* Check zero linger _after_ checking for unread data. */ | |
923 | sk->sk_prot->disconnect(sk, 0); | |
924 | } else if (dccp_close_state(sk)) { | |
7ad07e7c | 925 | dccp_send_close(sk, 1); |
7c657876 ACM |
926 | } |
927 | ||
928 | sk_stream_wait_close(sk, timeout); | |
929 | ||
930 | adjudge_to_death: | |
134af346 HX |
931 | state = sk->sk_state; |
932 | sock_hold(sk); | |
933 | sock_orphan(sk); | |
934 | atomic_inc(sk->sk_prot->orphan_count); | |
935 | ||
7ad07e7c ACM |
936 | /* |
937 | * It is the last release_sock in its life. It will remove backlog. | |
938 | */ | |
7c657876 ACM |
939 | release_sock(sk); |
940 | /* | |
941 | * Now socket is owned by kernel and we acquire BH lock | |
942 | * to finish close. No need to check for user refs. | |
943 | */ | |
944 | local_bh_disable(); | |
945 | bh_lock_sock(sk); | |
946 | BUG_TRAP(!sock_owned_by_user(sk)); | |
947 | ||
134af346 HX |
948 | /* Have we already been destroyed by a softirq or backlog? */ |
949 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
950 | goto out; | |
7ad07e7c ACM |
951 | |
952 | /* | |
953 | * The last release_sock may have processed the CLOSE or RESET | |
954 | * packet moving sock to CLOSED state, if not we have to fire | |
955 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" | |
956 | * in draft-ietf-dccp-spec-11. -acme | |
957 | */ | |
958 | if (sk->sk_state == DCCP_CLOSING) { | |
959 | /* FIXME: should start at 2 * RTT */ | |
960 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ | |
961 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
962 | inet_csk(sk)->icsk_rto, | |
963 | DCCP_RTO_MAX); | |
964 | #if 0 | |
965 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ | |
7c657876 | 966 | dccp_set_state(sk, DCCP_CLOSED); |
7ad07e7c ACM |
967 | #endif |
968 | } | |
7c657876 | 969 | |
7c657876 ACM |
970 | if (sk->sk_state == DCCP_CLOSED) |
971 | inet_csk_destroy_sock(sk); | |
972 | ||
973 | /* Otherwise, socket is reprieved until protocol close. */ | |
974 | ||
134af346 | 975 | out: |
7c657876 ACM |
976 | bh_unlock_sock(sk); |
977 | local_bh_enable(); | |
978 | sock_put(sk); | |
979 | } | |
980 | ||
f21e68ca ACM |
981 | EXPORT_SYMBOL_GPL(dccp_close); |
982 | ||
7c657876 ACM |
983 | void dccp_shutdown(struct sock *sk, int how) |
984 | { | |
8e8c71f1 | 985 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
986 | } |
987 | ||
f21e68ca ACM |
988 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
989 | ||
46f09ffa | 990 | static int __init dccp_mib_init(void) |
7c657876 ACM |
991 | { |
992 | int rc = -ENOMEM; | |
993 | ||
994 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
995 | if (dccp_statistics[0] == NULL) | |
996 | goto out; | |
997 | ||
998 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
999 | if (dccp_statistics[1] == NULL) | |
1000 | goto out_free_one; | |
1001 | ||
1002 | rc = 0; | |
1003 | out: | |
1004 | return rc; | |
1005 | out_free_one: | |
1006 | free_percpu(dccp_statistics[0]); | |
1007 | dccp_statistics[0] = NULL; | |
1008 | goto out; | |
1009 | ||
1010 | } | |
1011 | ||
b61fafc4 | 1012 | static void dccp_mib_exit(void) |
46f09ffa ACM |
1013 | { |
1014 | free_percpu(dccp_statistics[0]); | |
1015 | free_percpu(dccp_statistics[1]); | |
1016 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
1017 | } | |
1018 | ||
7c657876 ACM |
1019 | static int thash_entries; |
1020 | module_param(thash_entries, int, 0444); | |
1021 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1022 | ||
a1d3a355 | 1023 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1024 | int dccp_debug; |
042d18f9 | 1025 | module_param(dccp_debug, bool, 0444); |
7c657876 | 1026 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1027 | |
1028 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1029 | #endif |
7c657876 ACM |
1030 | |
1031 | static int __init dccp_init(void) | |
1032 | { | |
1033 | unsigned long goal; | |
1034 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1035 | int rc = -ENOBUFS; |
7c657876 | 1036 | |
7690af3f ACM |
1037 | dccp_hashinfo.bind_bucket_cachep = |
1038 | kmem_cache_create("dccp_bind_bucket", | |
1039 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1040 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1041 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1042 | goto out; |
7c657876 ACM |
1043 | |
1044 | /* | |
1045 | * Size and allocate the main established and bind bucket | |
1046 | * hash tables. | |
1047 | * | |
1048 | * The methodology is similar to that of the buffer cache. | |
1049 | */ | |
1050 | if (num_physpages >= (128 * 1024)) | |
1051 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1052 | else | |
1053 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1054 | ||
1055 | if (thash_entries) | |
7690af3f ACM |
1056 | goal = (thash_entries * |
1057 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1058 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1059 | ; | |
1060 | do { | |
1061 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1062 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1063 | while (dccp_hashinfo.ehash_size & |
1064 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1065 | dccp_hashinfo.ehash_size--; |
1066 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1067 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1068 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1069 | ||
1070 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1071 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1072 | goto out_free_bind_bucket_cachep; |
1073 | } | |
1074 | ||
dbca9b27 | 1075 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1076 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1077 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1078 | } |
1079 | ||
230140cf ED |
1080 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1081 | goto out_free_dccp_ehash; | |
1082 | ||
7c657876 ACM |
1083 | bhash_order = ehash_order; |
1084 | ||
1085 | do { | |
1086 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1087 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1088 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1089 | bhash_order > 0) | |
7c657876 ACM |
1090 | continue; |
1091 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1092 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1093 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1094 | ||
1095 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1096 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1097 | goto out_free_dccp_locks; |
7c657876 ACM |
1098 | } |
1099 | ||
1100 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1101 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1102 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1103 | } | |
1104 | ||
46f09ffa | 1105 | rc = dccp_mib_init(); |
fa23e2ec | 1106 | if (rc) |
7c657876 ACM |
1107 | goto out_free_dccp_bhash; |
1108 | ||
9b07ef5d | 1109 | rc = dccp_ackvec_init(); |
7c657876 | 1110 | if (rc) |
b61fafc4 | 1111 | goto out_free_dccp_mib; |
9b07ef5d | 1112 | |
e55d912f | 1113 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1114 | if (rc) |
1115 | goto out_ackvec_exit; | |
4c70f383 GR |
1116 | |
1117 | dccp_timestamping_init(); | |
7c657876 ACM |
1118 | out: |
1119 | return rc; | |
9b07ef5d ACM |
1120 | out_ackvec_exit: |
1121 | dccp_ackvec_exit(); | |
b61fafc4 | 1122 | out_free_dccp_mib: |
46f09ffa | 1123 | dccp_mib_exit(); |
7c657876 ACM |
1124 | out_free_dccp_bhash: |
1125 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1126 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1127 | out_free_dccp_locks: |
1128 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1129 | out_free_dccp_ehash: |
1130 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1131 | dccp_hashinfo.ehash = NULL; | |
1132 | out_free_bind_bucket_cachep: | |
1133 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1134 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1135 | goto out; |
1136 | } | |
1137 | ||
7c657876 ACM |
1138 | static void __exit dccp_fini(void) |
1139 | { | |
46f09ffa | 1140 | dccp_mib_exit(); |
725ba8ee ACM |
1141 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1142 | get_order(dccp_hashinfo.bhash_size * | |
1143 | sizeof(struct inet_bind_hashbucket))); | |
1144 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1145 | get_order(dccp_hashinfo.ehash_size * | |
1146 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1147 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1148 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1149 | dccp_ackvec_exit(); |
e55d912f | 1150 | dccp_sysctl_exit(); |
7c657876 ACM |
1151 | } |
1152 | ||
1153 | module_init(dccp_init); | |
1154 | module_exit(dccp_fini); | |
1155 | ||
7c657876 ACM |
1156 | MODULE_LICENSE("GPL"); |
1157 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1158 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |