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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 ACM |
176 | |
177 | /* | |
178 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
179 | * the listening (master) sock get CCID control blocks, which is not | |
180 | * necessary, but for now, to not mess with the test userspace apps, | |
181 | * lets leave it here, later the real solution is to do this in a | |
182 | * setsockopt(CCIDs-I-want/accept). -acme | |
183 | */ | |
72478873 | 184 | if (likely(ctl_sock_initialized)) { |
8ca0d17b | 185 | int rc = dccp_feat_init(dmsk); |
3e0fadc5 ACM |
186 | |
187 | if (rc) | |
188 | return rc; | |
189 | ||
a4bf3902 | 190 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
191 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
192 | if (dp->dccps_hc_rx_ackvec == NULL) | |
193 | return -ENOMEM; | |
194 | } | |
a4bf3902 ACM |
195 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
196 | sk, GFP_KERNEL); | |
197 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
198 | sk, GFP_KERNEL); | |
8109b02b | 199 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
3e0fadc5 ACM |
200 | dp->dccps_hc_tx_ccid == NULL)) { |
201 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
202 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
a4bf3902 | 203 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
204 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
205 | dp->dccps_hc_rx_ackvec = NULL; | |
206 | } | |
207 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
208 | return -ENOMEM; | |
209 | } | |
210 | } else { | |
211 | /* control socket doesn't need feat nego */ | |
a4bf3902 ACM |
212 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
213 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
3e0fadc5 ACM |
214 | } |
215 | ||
216 | dccp_init_xmit_timers(sk); | |
217 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; | |
2e2e9e92 | 218 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; |
3e0fadc5 ACM |
219 | sk->sk_state = DCCP_CLOSED; |
220 | sk->sk_write_space = dccp_write_space; | |
221 | icsk->icsk_sync_mss = dccp_sync_mss; | |
222 | dp->dccps_mss_cache = 536; | |
a94f0f97 | 223 | dp->dccps_rate_last = jiffies; |
3e0fadc5 | 224 | dp->dccps_role = DCCP_ROLE_UNDEFINED; |
00e4d116 | 225 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; |
3e0fadc5 ACM |
226 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
232 | ||
233 | int dccp_destroy_sock(struct sock *sk) | |
234 | { | |
235 | struct dccp_sock *dp = dccp_sk(sk); | |
8ca0d17b | 236 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
237 | |
238 | /* | |
239 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
240 | * for retransmissions | |
241 | */ | |
242 | if (sk->sk_send_head != NULL) { | |
243 | kfree_skb(sk->sk_send_head); | |
244 | sk->sk_send_head = NULL; | |
245 | } | |
246 | ||
247 | /* Clean up a referenced DCCP bind bucket. */ | |
248 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
249 | inet_put_port(&dccp_hashinfo, sk); | |
250 | ||
251 | kfree(dp->dccps_service_list); | |
252 | dp->dccps_service_list = NULL; | |
253 | ||
8ca0d17b | 254 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
255 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
256 | dp->dccps_hc_rx_ackvec = NULL; | |
257 | } | |
258 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
259 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
260 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
261 | ||
262 | /* clean up feature negotiation state */ | |
8ca0d17b | 263 | dccp_feat_clean(dmsk); |
3e0fadc5 ACM |
264 | |
265 | return 0; | |
266 | } | |
267 | ||
268 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
269 | ||
72a3effa | 270 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 271 | { |
67e6b629 ACM |
272 | struct dccp_sock *dp = dccp_sk(sk); |
273 | ||
274 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
72a3effa | 275 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
276 | } |
277 | ||
278 | int dccp_disconnect(struct sock *sk, int flags) | |
279 | { | |
280 | struct inet_connection_sock *icsk = inet_csk(sk); | |
281 | struct inet_sock *inet = inet_sk(sk); | |
282 | int err = 0; | |
283 | const int old_state = sk->sk_state; | |
284 | ||
285 | if (old_state != DCCP_CLOSED) | |
286 | dccp_set_state(sk, DCCP_CLOSED); | |
287 | ||
288 | /* ABORT function of RFC793 */ | |
289 | if (old_state == DCCP_LISTEN) { | |
290 | inet_csk_listen_stop(sk); | |
291 | /* FIXME: do the active reset thing */ | |
292 | } else if (old_state == DCCP_REQUESTING) | |
293 | sk->sk_err = ECONNRESET; | |
294 | ||
295 | dccp_clear_xmit_timers(sk); | |
296 | __skb_queue_purge(&sk->sk_receive_queue); | |
297 | if (sk->sk_send_head != NULL) { | |
298 | __kfree_skb(sk->sk_send_head); | |
299 | sk->sk_send_head = NULL; | |
300 | } | |
301 | ||
302 | inet->dport = 0; | |
303 | ||
304 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
305 | inet_reset_saddr(sk); | |
306 | ||
307 | sk->sk_shutdown = 0; | |
308 | sock_reset_flag(sk, SOCK_DONE); | |
309 | ||
310 | icsk->icsk_backoff = 0; | |
311 | inet_csk_delack_init(sk); | |
312 | __sk_dst_reset(sk); | |
313 | ||
314 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
315 | ||
316 | sk->sk_error_report(sk); | |
317 | return err; | |
318 | } | |
319 | ||
f21e68ca ACM |
320 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
321 | ||
331968bd ACM |
322 | /* |
323 | * Wait for a DCCP event. | |
324 | * | |
325 | * Note that we don't need to lock the socket, as the upper poll layers | |
326 | * take care of normal races (between the test and the event) and we don't | |
327 | * go look at any of the socket buffers directly. | |
328 | */ | |
f21e68ca ACM |
329 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
330 | poll_table *wait) | |
331968bd ACM |
331 | { |
332 | unsigned int mask; | |
333 | struct sock *sk = sock->sk; | |
334 | ||
335 | poll_wait(file, sk->sk_sleep, wait); | |
336 | if (sk->sk_state == DCCP_LISTEN) | |
337 | return inet_csk_listen_poll(sk); | |
338 | ||
339 | /* Socket is not locked. We are protected from async events | |
340 | by poll logic and correct handling of state changes | |
341 | made by another threads is impossible in any case. | |
342 | */ | |
343 | ||
344 | mask = 0; | |
345 | if (sk->sk_err) | |
346 | mask = POLLERR; | |
347 | ||
348 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
349 | mask |= POLLHUP; | |
350 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 351 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
352 | |
353 | /* Connected? */ | |
354 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
355 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
356 | mask |= POLLIN | POLLRDNORM; | |
357 | ||
358 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
359 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
360 | mask |= POLLOUT | POLLWRNORM; | |
361 | } else { /* send SIGIO later */ | |
362 | set_bit(SOCK_ASYNC_NOSPACE, | |
363 | &sk->sk_socket->flags); | |
364 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
365 | ||
366 | /* Race breaker. If space is freed after | |
367 | * wspace test but before the flags are set, | |
368 | * IO signal will be lost. | |
369 | */ | |
370 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
371 | mask |= POLLOUT | POLLWRNORM; | |
372 | } | |
373 | } | |
374 | } | |
375 | return mask; | |
376 | } | |
377 | ||
f21e68ca ACM |
378 | EXPORT_SYMBOL_GPL(dccp_poll); |
379 | ||
7c657876 ACM |
380 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
381 | { | |
6273172e ACM |
382 | int rc = -ENOTCONN; |
383 | ||
384 | lock_sock(sk); | |
385 | ||
386 | if (sk->sk_state == DCCP_LISTEN) | |
387 | goto out; | |
388 | ||
389 | switch (cmd) { | |
390 | case SIOCINQ: { | |
391 | struct sk_buff *skb; | |
392 | unsigned long amount = 0; | |
393 | ||
394 | skb = skb_peek(&sk->sk_receive_queue); | |
395 | if (skb != NULL) { | |
396 | /* | |
397 | * We will only return the amount of this packet since | |
398 | * that is all that will be read. | |
399 | */ | |
400 | amount = skb->len; | |
401 | } | |
402 | rc = put_user(amount, (int __user *)arg); | |
403 | } | |
404 | break; | |
405 | default: | |
406 | rc = -ENOIOCTLCMD; | |
407 | break; | |
408 | } | |
409 | out: | |
410 | release_sock(sk); | |
411 | return rc; | |
7c657876 ACM |
412 | } |
413 | ||
f21e68ca ACM |
414 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
415 | ||
60fe62e7 | 416 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
417 | char __user *optval, int optlen) |
418 | { | |
419 | struct dccp_sock *dp = dccp_sk(sk); | |
420 | struct dccp_service_list *sl = NULL; | |
421 | ||
8109b02b | 422 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
423 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
424 | return -EINVAL; | |
425 | ||
426 | if (optlen > sizeof(service)) { | |
427 | sl = kmalloc(optlen, GFP_KERNEL); | |
428 | if (sl == NULL) | |
429 | return -ENOMEM; | |
430 | ||
431 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
432 | if (copy_from_user(sl->dccpsl_list, | |
433 | optval + sizeof(service), | |
434 | optlen - sizeof(service)) || | |
435 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
436 | kfree(sl); | |
437 | return -EFAULT; | |
438 | } | |
439 | } | |
440 | ||
441 | lock_sock(sk); | |
442 | dp->dccps_service = service; | |
443 | ||
a51482bd | 444 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
445 | |
446 | dp->dccps_service_list = sl; | |
447 | release_sock(sk); | |
448 | return 0; | |
449 | } | |
450 | ||
afe00251 AB |
451 | /* byte 1 is feature. the rest is the preference list */ |
452 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
453 | struct dccp_so_feat __user *optval) | |
454 | { | |
455 | struct dccp_so_feat opt; | |
456 | u8 *val; | |
457 | int rc; | |
458 | ||
459 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
460 | return -EFAULT; | |
461 | ||
462 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
463 | if (!val) | |
464 | return -ENOMEM; | |
465 | ||
466 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
467 | rc = -EFAULT; | |
468 | goto out_free_val; | |
469 | } | |
470 | ||
8ca0d17b ACM |
471 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
472 | val, opt.dccpsf_len, GFP_KERNEL); | |
afe00251 AB |
473 | if (rc) |
474 | goto out_free_val; | |
475 | ||
476 | out: | |
477 | return rc; | |
478 | ||
479 | out_free_val: | |
480 | kfree(val); | |
481 | goto out; | |
482 | } | |
483 | ||
3fdadf7d DM |
484 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
485 | char __user *optval, int optlen) | |
7c657876 | 486 | { |
09dbc389 GR |
487 | struct dccp_sock *dp = dccp_sk(sk); |
488 | int val, err = 0; | |
7c657876 | 489 | |
a84ffe43 ACM |
490 | if (optlen < sizeof(int)) |
491 | return -EINVAL; | |
492 | ||
493 | if (get_user(val, (int __user *)optval)) | |
494 | return -EFAULT; | |
495 | ||
67e6b629 ACM |
496 | if (optname == DCCP_SOCKOPT_SERVICE) |
497 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 498 | |
67e6b629 | 499 | lock_sock(sk); |
a84ffe43 ACM |
500 | switch (optname) { |
501 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 502 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 503 | err = 0; |
a84ffe43 | 504 | break; |
afe00251 AB |
505 | case DCCP_SOCKOPT_CHANGE_L: |
506 | if (optlen != sizeof(struct dccp_so_feat)) | |
507 | err = -EINVAL; | |
508 | else | |
509 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
c9eaf173 | 510 | (struct dccp_so_feat __user *) |
afe00251 AB |
511 | optval); |
512 | break; | |
afe00251 AB |
513 | case DCCP_SOCKOPT_CHANGE_R: |
514 | if (optlen != sizeof(struct dccp_so_feat)) | |
515 | err = -EINVAL; | |
516 | else | |
517 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
9faefb6d | 518 | (struct dccp_so_feat __user *) |
afe00251 AB |
519 | optval); |
520 | break; | |
6f4e5fff GR |
521 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
522 | if (val < 0 || val > 15) | |
523 | err = -EINVAL; | |
524 | else | |
525 | dp->dccps_pcslen = val; | |
526 | break; | |
527 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ | |
528 | if (val < 0 || val > 15) | |
529 | err = -EINVAL; | |
530 | else { | |
531 | dp->dccps_pcrlen = val; | |
532 | /* FIXME: add feature negotiation, | |
533 | * ChangeL(MinimumChecksumCoverage, val) */ | |
534 | } | |
535 | break; | |
a84ffe43 ACM |
536 | default: |
537 | err = -ENOPROTOOPT; | |
538 | break; | |
539 | } | |
6f4e5fff | 540 | |
a84ffe43 ACM |
541 | release_sock(sk); |
542 | return err; | |
7c657876 ACM |
543 | } |
544 | ||
3fdadf7d DM |
545 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
546 | char __user *optval, int optlen) | |
547 | { | |
548 | if (level != SOL_DCCP) | |
549 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
550 | optname, optval, | |
551 | optlen); | |
552 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
553 | } | |
543d9cfe | 554 | |
f21e68ca ACM |
555 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
556 | ||
3fdadf7d DM |
557 | #ifdef CONFIG_COMPAT |
558 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 559 | char __user *optval, int optlen) |
3fdadf7d | 560 | { |
dec73ff0 ACM |
561 | if (level != SOL_DCCP) |
562 | return inet_csk_compat_setsockopt(sk, level, optname, | |
563 | optval, optlen); | |
3fdadf7d DM |
564 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
565 | } | |
543d9cfe | 566 | |
3fdadf7d DM |
567 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
568 | #endif | |
569 | ||
67e6b629 | 570 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 571 | __be32 __user *optval, |
67e6b629 ACM |
572 | int __user *optlen) |
573 | { | |
574 | const struct dccp_sock *dp = dccp_sk(sk); | |
575 | const struct dccp_service_list *sl; | |
576 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
577 | ||
578 | lock_sock(sk); | |
67e6b629 ACM |
579 | if ((sl = dp->dccps_service_list) != NULL) { |
580 | slen = sl->dccpsl_nr * sizeof(u32); | |
581 | total_len += slen; | |
582 | } | |
583 | ||
584 | err = -EINVAL; | |
585 | if (total_len > len) | |
586 | goto out; | |
587 | ||
588 | err = 0; | |
589 | if (put_user(total_len, optlen) || | |
590 | put_user(dp->dccps_service, optval) || | |
591 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
592 | err = -EFAULT; | |
593 | out: | |
594 | release_sock(sk); | |
595 | return err; | |
596 | } | |
597 | ||
3fdadf7d | 598 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 599 | char __user *optval, int __user *optlen) |
7c657876 | 600 | { |
a84ffe43 ACM |
601 | struct dccp_sock *dp; |
602 | int val, len; | |
7c657876 | 603 | |
a84ffe43 ACM |
604 | if (get_user(len, optlen)) |
605 | return -EFAULT; | |
606 | ||
39ebc027 | 607 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
608 | return -EINVAL; |
609 | ||
610 | dp = dccp_sk(sk); | |
611 | ||
612 | switch (optname) { | |
613 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 614 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 615 | return 0; |
88f964db ACM |
616 | case DCCP_SOCKOPT_SERVICE: |
617 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 618 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
619 | case DCCP_SOCKOPT_GET_CUR_MPS: |
620 | val = dp->dccps_mss_cache; | |
621 | len = sizeof(val); | |
622 | break; | |
6f4e5fff GR |
623 | case DCCP_SOCKOPT_SEND_CSCOV: |
624 | val = dp->dccps_pcslen; | |
39ebc027 | 625 | len = sizeof(val); |
6f4e5fff GR |
626 | break; |
627 | case DCCP_SOCKOPT_RECV_CSCOV: | |
628 | val = dp->dccps_pcrlen; | |
39ebc027 | 629 | len = sizeof(val); |
6f4e5fff | 630 | break; |
88f964db ACM |
631 | case 128 ... 191: |
632 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
633 | len, (u32 __user *)optval, optlen); | |
634 | case 192 ... 255: | |
635 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
636 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
637 | default: |
638 | return -ENOPROTOOPT; | |
639 | } | |
640 | ||
641 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
642 | return -EFAULT; | |
643 | ||
644 | return 0; | |
7c657876 ACM |
645 | } |
646 | ||
3fdadf7d DM |
647 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
648 | char __user *optval, int __user *optlen) | |
649 | { | |
650 | if (level != SOL_DCCP) | |
651 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
652 | optname, optval, | |
653 | optlen); | |
654 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
655 | } | |
543d9cfe | 656 | |
f21e68ca ACM |
657 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
658 | ||
3fdadf7d DM |
659 | #ifdef CONFIG_COMPAT |
660 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 661 | char __user *optval, int __user *optlen) |
3fdadf7d | 662 | { |
dec73ff0 ACM |
663 | if (level != SOL_DCCP) |
664 | return inet_csk_compat_getsockopt(sk, level, optname, | |
665 | optval, optlen); | |
3fdadf7d DM |
666 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
667 | } | |
543d9cfe | 668 | |
3fdadf7d DM |
669 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
670 | #endif | |
671 | ||
7c657876 ACM |
672 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
673 | size_t len) | |
674 | { | |
675 | const struct dccp_sock *dp = dccp_sk(sk); | |
676 | const int flags = msg->msg_flags; | |
677 | const int noblock = flags & MSG_DONTWAIT; | |
678 | struct sk_buff *skb; | |
679 | int rc, size; | |
680 | long timeo; | |
681 | ||
682 | if (len > dp->dccps_mss_cache) | |
683 | return -EMSGSIZE; | |
684 | ||
685 | lock_sock(sk); | |
b1308dc0 IM |
686 | |
687 | if (sysctl_dccp_tx_qlen && | |
688 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
689 | rc = -EAGAIN; | |
690 | goto out_release; | |
691 | } | |
692 | ||
27258ee5 | 693 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
694 | |
695 | /* | |
696 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
697 | * so that the trick in dccp_rcv_request_sent_state_process. | |
698 | */ | |
699 | /* Wait for a connection to finish. */ | |
cecd8d0e | 700 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 701 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 702 | goto out_release; |
7c657876 ACM |
703 | |
704 | size = sk->sk_prot->max_header + len; | |
705 | release_sock(sk); | |
706 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
707 | lock_sock(sk); | |
7c657876 ACM |
708 | if (skb == NULL) |
709 | goto out_release; | |
710 | ||
711 | skb_reserve(skb, sk->sk_prot->max_header); | |
712 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
713 | if (rc != 0) |
714 | goto out_discard; | |
715 | ||
97e5848d IM |
716 | skb_queue_tail(&sk->sk_write_queue, skb); |
717 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
718 | out_release: |
719 | release_sock(sk); | |
720 | return rc ? : len; | |
27258ee5 ACM |
721 | out_discard: |
722 | kfree_skb(skb); | |
7c657876 | 723 | goto out_release; |
7c657876 ACM |
724 | } |
725 | ||
f21e68ca ACM |
726 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
727 | ||
7c657876 ACM |
728 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
729 | size_t len, int nonblock, int flags, int *addr_len) | |
730 | { | |
731 | const struct dccp_hdr *dh; | |
7c657876 ACM |
732 | long timeo; |
733 | ||
734 | lock_sock(sk); | |
735 | ||
531669a0 ACM |
736 | if (sk->sk_state == DCCP_LISTEN) { |
737 | len = -ENOTCONN; | |
7c657876 | 738 | goto out; |
7c657876 | 739 | } |
7c657876 | 740 | |
531669a0 | 741 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
742 | |
743 | do { | |
531669a0 | 744 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 745 | |
531669a0 ACM |
746 | if (skb == NULL) |
747 | goto verify_sock_status; | |
7c657876 | 748 | |
531669a0 | 749 | dh = dccp_hdr(skb); |
7c657876 | 750 | |
531669a0 ACM |
751 | if (dh->dccph_type == DCCP_PKT_DATA || |
752 | dh->dccph_type == DCCP_PKT_DATAACK) | |
753 | goto found_ok_skb; | |
7c657876 | 754 | |
531669a0 ACM |
755 | if (dh->dccph_type == DCCP_PKT_RESET || |
756 | dh->dccph_type == DCCP_PKT_CLOSE) { | |
757 | dccp_pr_debug("found fin ok!\n"); | |
758 | len = 0; | |
759 | goto found_fin_ok; | |
760 | } | |
761 | dccp_pr_debug("packet_type=%s\n", | |
762 | dccp_packet_name(dh->dccph_type)); | |
624d1164 | 763 | sk_eat_skb(sk, skb, 0); |
531669a0 ACM |
764 | verify_sock_status: |
765 | if (sock_flag(sk, SOCK_DONE)) { | |
766 | len = 0; | |
7c657876 | 767 | break; |
531669a0 | 768 | } |
7c657876 | 769 | |
531669a0 ACM |
770 | if (sk->sk_err) { |
771 | len = sock_error(sk); | |
772 | break; | |
773 | } | |
7c657876 | 774 | |
531669a0 ACM |
775 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
776 | len = 0; | |
777 | break; | |
778 | } | |
7c657876 | 779 | |
531669a0 ACM |
780 | if (sk->sk_state == DCCP_CLOSED) { |
781 | if (!sock_flag(sk, SOCK_DONE)) { | |
782 | /* This occurs when user tries to read | |
783 | * from never connected socket. | |
784 | */ | |
785 | len = -ENOTCONN; | |
7c657876 ACM |
786 | break; |
787 | } | |
531669a0 ACM |
788 | len = 0; |
789 | break; | |
7c657876 ACM |
790 | } |
791 | ||
531669a0 ACM |
792 | if (!timeo) { |
793 | len = -EAGAIN; | |
794 | break; | |
795 | } | |
7c657876 | 796 | |
531669a0 ACM |
797 | if (signal_pending(current)) { |
798 | len = sock_intr_errno(timeo); | |
799 | break; | |
800 | } | |
7c657876 | 801 | |
531669a0 | 802 | sk_wait_data(sk, &timeo); |
7c657876 | 803 | continue; |
7c657876 | 804 | found_ok_skb: |
531669a0 ACM |
805 | if (len > skb->len) |
806 | len = skb->len; | |
807 | else if (len < skb->len) | |
808 | msg->msg_flags |= MSG_TRUNC; | |
809 | ||
810 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
811 | /* Exception. Bailout! */ | |
812 | len = -EFAULT; | |
813 | break; | |
7c657876 | 814 | } |
7c657876 ACM |
815 | found_fin_ok: |
816 | if (!(flags & MSG_PEEK)) | |
624d1164 | 817 | sk_eat_skb(sk, skb, 0); |
7c657876 | 818 | break; |
531669a0 | 819 | } while (1); |
7c657876 ACM |
820 | out: |
821 | release_sock(sk); | |
531669a0 | 822 | return len; |
7c657876 ACM |
823 | } |
824 | ||
f21e68ca ACM |
825 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
826 | ||
827 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
828 | { |
829 | struct sock *sk = sock->sk; | |
830 | unsigned char old_state; | |
831 | int err; | |
832 | ||
833 | lock_sock(sk); | |
834 | ||
835 | err = -EINVAL; | |
836 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
837 | goto out; | |
838 | ||
839 | old_state = sk->sk_state; | |
840 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
841 | goto out; | |
842 | ||
843 | /* Really, if the socket is already in listen state | |
844 | * we can only allow the backlog to be adjusted. | |
845 | */ | |
846 | if (old_state != DCCP_LISTEN) { | |
847 | /* | |
848 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
849 | * see tcp_listen_start | |
850 | */ | |
72a3effa | 851 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
852 | if (err) |
853 | goto out; | |
854 | } | |
855 | sk->sk_max_ack_backlog = backlog; | |
856 | err = 0; | |
857 | ||
858 | out: | |
859 | release_sock(sk); | |
860 | return err; | |
861 | } | |
862 | ||
f21e68ca ACM |
863 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
864 | ||
7c657876 | 865 | static const unsigned char dccp_new_state[] = { |
7690af3f ACM |
866 | /* current state: new state: action: */ |
867 | [0] = DCCP_CLOSED, | |
8109b02b | 868 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, |
7690af3f ACM |
869 | [DCCP_REQUESTING] = DCCP_CLOSED, |
870 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
871 | [DCCP_LISTEN] = DCCP_CLOSED, | |
872 | [DCCP_RESPOND] = DCCP_CLOSED, | |
873 | [DCCP_CLOSING] = DCCP_CLOSED, | |
874 | [DCCP_TIME_WAIT] = DCCP_CLOSED, | |
875 | [DCCP_CLOSED] = DCCP_CLOSED, | |
7c657876 ACM |
876 | }; |
877 | ||
878 | static int dccp_close_state(struct sock *sk) | |
879 | { | |
880 | const int next = dccp_new_state[sk->sk_state]; | |
881 | const int ns = next & DCCP_STATE_MASK; | |
882 | ||
883 | if (ns != sk->sk_state) | |
884 | dccp_set_state(sk, ns); | |
885 | ||
886 | return next & DCCP_ACTION_FIN; | |
887 | } | |
888 | ||
889 | void dccp_close(struct sock *sk, long timeout) | |
890 | { | |
97e5848d | 891 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 892 | struct sk_buff *skb; |
134af346 | 893 | int state; |
7c657876 ACM |
894 | |
895 | lock_sock(sk); | |
896 | ||
897 | sk->sk_shutdown = SHUTDOWN_MASK; | |
898 | ||
899 | if (sk->sk_state == DCCP_LISTEN) { | |
900 | dccp_set_state(sk, DCCP_CLOSED); | |
901 | ||
902 | /* Special case. */ | |
903 | inet_csk_listen_stop(sk); | |
904 | ||
905 | goto adjudge_to_death; | |
906 | } | |
907 | ||
97e5848d IM |
908 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
909 | ||
7c657876 ACM |
910 | /* |
911 | * We need to flush the recv. buffs. We do this only on the | |
912 | * descriptor close, not protocol-sourced closes, because the | |
913 | *reader process may not have drained the data yet! | |
914 | */ | |
915 | /* FIXME: check for unread data */ | |
916 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
917 | __kfree_skb(skb); | |
918 | } | |
919 | ||
920 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
921 | /* Check zero linger _after_ checking for unread data. */ | |
922 | sk->sk_prot->disconnect(sk, 0); | |
923 | } else if (dccp_close_state(sk)) { | |
7ad07e7c | 924 | dccp_send_close(sk, 1); |
7c657876 ACM |
925 | } |
926 | ||
927 | sk_stream_wait_close(sk, timeout); | |
928 | ||
929 | adjudge_to_death: | |
134af346 HX |
930 | state = sk->sk_state; |
931 | sock_hold(sk); | |
932 | sock_orphan(sk); | |
933 | atomic_inc(sk->sk_prot->orphan_count); | |
934 | ||
7ad07e7c ACM |
935 | /* |
936 | * It is the last release_sock in its life. It will remove backlog. | |
937 | */ | |
7c657876 ACM |
938 | release_sock(sk); |
939 | /* | |
940 | * Now socket is owned by kernel and we acquire BH lock | |
941 | * to finish close. No need to check for user refs. | |
942 | */ | |
943 | local_bh_disable(); | |
944 | bh_lock_sock(sk); | |
945 | BUG_TRAP(!sock_owned_by_user(sk)); | |
946 | ||
134af346 HX |
947 | /* Have we already been destroyed by a softirq or backlog? */ |
948 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
949 | goto out; | |
7ad07e7c ACM |
950 | |
951 | /* | |
952 | * The last release_sock may have processed the CLOSE or RESET | |
953 | * packet moving sock to CLOSED state, if not we have to fire | |
954 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" | |
955 | * in draft-ietf-dccp-spec-11. -acme | |
956 | */ | |
957 | if (sk->sk_state == DCCP_CLOSING) { | |
958 | /* FIXME: should start at 2 * RTT */ | |
959 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ | |
960 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
961 | inet_csk(sk)->icsk_rto, | |
962 | DCCP_RTO_MAX); | |
963 | #if 0 | |
964 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ | |
7c657876 | 965 | dccp_set_state(sk, DCCP_CLOSED); |
7ad07e7c ACM |
966 | #endif |
967 | } | |
7c657876 | 968 | |
7c657876 ACM |
969 | if (sk->sk_state == DCCP_CLOSED) |
970 | inet_csk_destroy_sock(sk); | |
971 | ||
972 | /* Otherwise, socket is reprieved until protocol close. */ | |
973 | ||
134af346 | 974 | out: |
7c657876 ACM |
975 | bh_unlock_sock(sk); |
976 | local_bh_enable(); | |
977 | sock_put(sk); | |
978 | } | |
979 | ||
f21e68ca ACM |
980 | EXPORT_SYMBOL_GPL(dccp_close); |
981 | ||
7c657876 ACM |
982 | void dccp_shutdown(struct sock *sk, int how) |
983 | { | |
984 | dccp_pr_debug("entry\n"); | |
985 | } | |
986 | ||
f21e68ca ACM |
987 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
988 | ||
46f09ffa | 989 | static int __init dccp_mib_init(void) |
7c657876 ACM |
990 | { |
991 | int rc = -ENOMEM; | |
992 | ||
993 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
994 | if (dccp_statistics[0] == NULL) | |
995 | goto out; | |
996 | ||
997 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
998 | if (dccp_statistics[1] == NULL) | |
999 | goto out_free_one; | |
1000 | ||
1001 | rc = 0; | |
1002 | out: | |
1003 | return rc; | |
1004 | out_free_one: | |
1005 | free_percpu(dccp_statistics[0]); | |
1006 | dccp_statistics[0] = NULL; | |
1007 | goto out; | |
1008 | ||
1009 | } | |
1010 | ||
b61fafc4 | 1011 | static void dccp_mib_exit(void) |
46f09ffa ACM |
1012 | { |
1013 | free_percpu(dccp_statistics[0]); | |
1014 | free_percpu(dccp_statistics[1]); | |
1015 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
1016 | } | |
1017 | ||
7c657876 ACM |
1018 | static int thash_entries; |
1019 | module_param(thash_entries, int, 0444); | |
1020 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1021 | ||
a1d3a355 | 1022 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1023 | int dccp_debug; |
042d18f9 | 1024 | module_param(dccp_debug, bool, 0444); |
7c657876 | 1025 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1026 | |
1027 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1028 | #endif |
7c657876 ACM |
1029 | |
1030 | static int __init dccp_init(void) | |
1031 | { | |
1032 | unsigned long goal; | |
1033 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1034 | int rc = -ENOBUFS; |
7c657876 | 1035 | |
7690af3f ACM |
1036 | dccp_hashinfo.bind_bucket_cachep = |
1037 | kmem_cache_create("dccp_bind_bucket", | |
1038 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1039 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1040 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1041 | goto out; |
7c657876 ACM |
1042 | |
1043 | /* | |
1044 | * Size and allocate the main established and bind bucket | |
1045 | * hash tables. | |
1046 | * | |
1047 | * The methodology is similar to that of the buffer cache. | |
1048 | */ | |
1049 | if (num_physpages >= (128 * 1024)) | |
1050 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1051 | else | |
1052 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1053 | ||
1054 | if (thash_entries) | |
7690af3f ACM |
1055 | goal = (thash_entries * |
1056 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1057 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1058 | ; | |
1059 | do { | |
1060 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1061 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1062 | while (dccp_hashinfo.ehash_size & |
1063 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1064 | dccp_hashinfo.ehash_size--; |
1065 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1066 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1067 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1068 | ||
1069 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1070 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1071 | goto out_free_bind_bucket_cachep; |
1072 | } | |
1073 | ||
dbca9b27 | 1074 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1075 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1076 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1077 | } |
1078 | ||
230140cf ED |
1079 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1080 | goto out_free_dccp_ehash; | |
1081 | ||
7c657876 ACM |
1082 | bhash_order = ehash_order; |
1083 | ||
1084 | do { | |
1085 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1086 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1087 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1088 | bhash_order > 0) | |
7c657876 ACM |
1089 | continue; |
1090 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1091 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1092 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1093 | ||
1094 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1095 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1096 | goto out_free_dccp_locks; |
7c657876 ACM |
1097 | } |
1098 | ||
1099 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1100 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1101 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1102 | } | |
1103 | ||
46f09ffa | 1104 | rc = dccp_mib_init(); |
fa23e2ec | 1105 | if (rc) |
7c657876 ACM |
1106 | goto out_free_dccp_bhash; |
1107 | ||
9b07ef5d | 1108 | rc = dccp_ackvec_init(); |
7c657876 | 1109 | if (rc) |
b61fafc4 | 1110 | goto out_free_dccp_mib; |
9b07ef5d | 1111 | |
e55d912f | 1112 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1113 | if (rc) |
1114 | goto out_ackvec_exit; | |
4c70f383 GR |
1115 | |
1116 | dccp_timestamping_init(); | |
7c657876 ACM |
1117 | out: |
1118 | return rc; | |
9b07ef5d ACM |
1119 | out_ackvec_exit: |
1120 | dccp_ackvec_exit(); | |
b61fafc4 | 1121 | out_free_dccp_mib: |
46f09ffa | 1122 | dccp_mib_exit(); |
7c657876 ACM |
1123 | out_free_dccp_bhash: |
1124 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1125 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1126 | out_free_dccp_locks: |
1127 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1128 | out_free_dccp_ehash: |
1129 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1130 | dccp_hashinfo.ehash = NULL; | |
1131 | out_free_bind_bucket_cachep: | |
1132 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1133 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1134 | goto out; |
1135 | } | |
1136 | ||
7c657876 ACM |
1137 | static void __exit dccp_fini(void) |
1138 | { | |
46f09ffa | 1139 | dccp_mib_exit(); |
725ba8ee ACM |
1140 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1141 | get_order(dccp_hashinfo.bhash_size * | |
1142 | sizeof(struct inet_bind_hashbucket))); | |
1143 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1144 | get_order(dccp_hashinfo.ehash_size * | |
1145 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1146 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1147 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1148 | dccp_ackvec_exit(); |
e55d912f | 1149 | dccp_sysctl_exit(); |
7c657876 ACM |
1150 | } |
1151 | ||
1152 | module_init(dccp_init); | |
1153 | module_exit(dccp_fini); | |
1154 | ||
7c657876 ACM |
1155 | MODULE_LICENSE("GPL"); |
1156 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1157 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |