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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 <linux/spinlock.h> |
31 | #include <linux/timer.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/poll.h> | |
7c657876 ACM |
34 | |
35 | #include "ccid.h" | |
36 | #include "dccp.h" | |
afe00251 | 37 | #include "feat.h" |
7c657876 | 38 | |
ba89966c | 39 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 | 40 | |
f21e68ca ACM |
41 | EXPORT_SYMBOL_GPL(dccp_statistics); |
42 | ||
7c657876 ACM |
43 | atomic_t dccp_orphan_count = ATOMIC_INIT(0); |
44 | ||
f21e68ca ACM |
45 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
46 | ||
075ae866 ACM |
47 | struct inet_hashinfo __cacheline_aligned dccp_hashinfo = { |
48 | .lhash_lock = RW_LOCK_UNLOCKED, | |
49 | .lhash_users = ATOMIC_INIT(0), | |
50 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait), | |
51 | }; | |
52 | ||
53 | EXPORT_SYMBOL_GPL(dccp_hashinfo); | |
54 | ||
b1308dc0 IM |
55 | /* the maximum queue length for tx in packets. 0 is no limit */ |
56 | int sysctl_dccp_tx_qlen __read_mostly = 5; | |
57 | ||
c25a18ba ACM |
58 | void dccp_set_state(struct sock *sk, const int state) |
59 | { | |
60 | const int oldstate = sk->sk_state; | |
61 | ||
f11135a3 | 62 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
c25a18ba ACM |
63 | dccp_state_name(oldstate), dccp_state_name(state)); |
64 | WARN_ON(state == oldstate); | |
65 | ||
66 | switch (state) { | |
67 | case DCCP_OPEN: | |
68 | if (oldstate != DCCP_OPEN) | |
69 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
70 | break; | |
71 | ||
72 | case DCCP_CLOSED: | |
0c869620 GR |
73 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
74 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
75 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
76 | ||
77 | sk->sk_prot->unhash(sk); | |
78 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
79 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 80 | inet_put_port(sk); |
c25a18ba ACM |
81 | /* fall through */ |
82 | default: | |
83 | if (oldstate == DCCP_OPEN) | |
84 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
85 | } | |
86 | ||
87 | /* Change state AFTER socket is unhashed to avoid closed | |
88 | * socket sitting in hash tables. | |
89 | */ | |
90 | sk->sk_state = state; | |
91 | } | |
92 | ||
93 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
94 | ||
0c869620 GR |
95 | static void dccp_finish_passive_close(struct sock *sk) |
96 | { | |
97 | switch (sk->sk_state) { | |
98 | case DCCP_PASSIVE_CLOSE: | |
99 | /* Node (client or server) has received Close packet. */ | |
100 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
101 | dccp_set_state(sk, DCCP_CLOSED); | |
102 | break; | |
103 | case DCCP_PASSIVE_CLOSEREQ: | |
104 | /* | |
105 | * Client received CloseReq. We set the `active' flag so that | |
106 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
107 | */ | |
108 | dccp_send_close(sk, 1); | |
109 | dccp_set_state(sk, DCCP_CLOSING); | |
110 | } | |
111 | } | |
112 | ||
c25a18ba ACM |
113 | void dccp_done(struct sock *sk) |
114 | { | |
115 | dccp_set_state(sk, DCCP_CLOSED); | |
116 | dccp_clear_xmit_timers(sk); | |
117 | ||
118 | sk->sk_shutdown = SHUTDOWN_MASK; | |
119 | ||
120 | if (!sock_flag(sk, SOCK_DEAD)) | |
121 | sk->sk_state_change(sk); | |
122 | else | |
123 | inet_csk_destroy_sock(sk); | |
124 | } | |
125 | ||
126 | EXPORT_SYMBOL_GPL(dccp_done); | |
127 | ||
7c657876 ACM |
128 | const char *dccp_packet_name(const int type) |
129 | { | |
130 | static const char *dccp_packet_names[] = { | |
131 | [DCCP_PKT_REQUEST] = "REQUEST", | |
132 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
133 | [DCCP_PKT_DATA] = "DATA", | |
134 | [DCCP_PKT_ACK] = "ACK", | |
135 | [DCCP_PKT_DATAACK] = "DATAACK", | |
136 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
137 | [DCCP_PKT_CLOSE] = "CLOSE", | |
138 | [DCCP_PKT_RESET] = "RESET", | |
139 | [DCCP_PKT_SYNC] = "SYNC", | |
140 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
141 | }; | |
142 | ||
143 | if (type >= DCCP_NR_PKT_TYPES) | |
144 | return "INVALID"; | |
145 | else | |
146 | return dccp_packet_names[type]; | |
147 | } | |
148 | ||
149 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
150 | ||
151 | const char *dccp_state_name(const int state) | |
152 | { | |
153 | static char *dccp_state_names[] = { | |
f11135a3 GR |
154 | [DCCP_OPEN] = "OPEN", |
155 | [DCCP_REQUESTING] = "REQUESTING", | |
156 | [DCCP_PARTOPEN] = "PARTOPEN", | |
157 | [DCCP_LISTEN] = "LISTEN", | |
158 | [DCCP_RESPOND] = "RESPOND", | |
159 | [DCCP_CLOSING] = "CLOSING", | |
160 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
161 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
162 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
163 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
164 | [DCCP_CLOSED] = "CLOSED", | |
7c657876 ACM |
165 | }; |
166 | ||
167 | if (state >= DCCP_MAX_STATES) | |
168 | return "INVALID STATE!"; | |
169 | else | |
170 | return dccp_state_names[state]; | |
171 | } | |
172 | ||
173 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
174 | ||
72478873 | 175 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
176 | { |
177 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 178 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 | 179 | struct inet_connection_sock *icsk = inet_csk(sk); |
3e0fadc5 | 180 | |
a4bf3902 | 181 | dccp_minisock_init(&dp->dccps_minisock); |
3e0fadc5 | 182 | |
e18d7a98 ACM |
183 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
184 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
185 | sk->sk_state = DCCP_CLOSED; | |
186 | sk->sk_write_space = dccp_write_space; | |
187 | icsk->icsk_sync_mss = dccp_sync_mss; | |
188 | dp->dccps_mss_cache = 536; | |
189 | dp->dccps_rate_last = jiffies; | |
190 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
191 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
192 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; | |
193 | ||
194 | dccp_init_xmit_timers(sk); | |
195 | ||
3e0fadc5 ACM |
196 | /* |
197 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
198 | * the listening (master) sock get CCID control blocks, which is not | |
199 | * necessary, but for now, to not mess with the test userspace apps, | |
200 | * lets leave it here, later the real solution is to do this in a | |
201 | * setsockopt(CCIDs-I-want/accept). -acme | |
202 | */ | |
72478873 | 203 | if (likely(ctl_sock_initialized)) { |
8ca0d17b | 204 | int rc = dccp_feat_init(dmsk); |
3e0fadc5 ACM |
205 | |
206 | if (rc) | |
207 | return rc; | |
208 | ||
a4bf3902 | 209 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
210 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
211 | if (dp->dccps_hc_rx_ackvec == NULL) | |
212 | return -ENOMEM; | |
213 | } | |
a4bf3902 ACM |
214 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
215 | sk, GFP_KERNEL); | |
216 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
217 | sk, GFP_KERNEL); | |
8109b02b | 218 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
3e0fadc5 ACM |
219 | dp->dccps_hc_tx_ccid == NULL)) { |
220 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
221 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
a4bf3902 | 222 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
223 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
224 | dp->dccps_hc_rx_ackvec = NULL; | |
225 | } | |
226 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
227 | return -ENOMEM; | |
228 | } | |
229 | } else { | |
230 | /* control socket doesn't need feat nego */ | |
a4bf3902 ACM |
231 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
232 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
3e0fadc5 ACM |
233 | } |
234 | ||
3e0fadc5 ACM |
235 | return 0; |
236 | } | |
237 | ||
238 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
239 | ||
240 | int dccp_destroy_sock(struct sock *sk) | |
241 | { | |
242 | struct dccp_sock *dp = dccp_sk(sk); | |
8ca0d17b | 243 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
244 | |
245 | /* | |
246 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
247 | * for retransmissions | |
248 | */ | |
249 | if (sk->sk_send_head != NULL) { | |
250 | kfree_skb(sk->sk_send_head); | |
251 | sk->sk_send_head = NULL; | |
252 | } | |
253 | ||
254 | /* Clean up a referenced DCCP bind bucket. */ | |
255 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 256 | inet_put_port(sk); |
3e0fadc5 ACM |
257 | |
258 | kfree(dp->dccps_service_list); | |
259 | dp->dccps_service_list = NULL; | |
260 | ||
8ca0d17b | 261 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
262 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
263 | dp->dccps_hc_rx_ackvec = NULL; | |
264 | } | |
265 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
266 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
267 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
268 | ||
269 | /* clean up feature negotiation state */ | |
8ca0d17b | 270 | dccp_feat_clean(dmsk); |
3e0fadc5 ACM |
271 | |
272 | return 0; | |
273 | } | |
274 | ||
275 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
276 | ||
72a3effa | 277 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 278 | { |
67e6b629 ACM |
279 | struct dccp_sock *dp = dccp_sk(sk); |
280 | ||
281 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
72a3effa | 282 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
283 | } |
284 | ||
ce865a61 GR |
285 | static inline int dccp_need_reset(int state) |
286 | { | |
287 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
288 | state != DCCP_REQUESTING; | |
289 | } | |
290 | ||
7c657876 ACM |
291 | int dccp_disconnect(struct sock *sk, int flags) |
292 | { | |
293 | struct inet_connection_sock *icsk = inet_csk(sk); | |
294 | struct inet_sock *inet = inet_sk(sk); | |
295 | int err = 0; | |
296 | const int old_state = sk->sk_state; | |
297 | ||
298 | if (old_state != DCCP_CLOSED) | |
299 | dccp_set_state(sk, DCCP_CLOSED); | |
300 | ||
ce865a61 GR |
301 | /* |
302 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
303 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
304 | */ | |
7c657876 ACM |
305 | if (old_state == DCCP_LISTEN) { |
306 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
307 | } else if (dccp_need_reset(old_state)) { |
308 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
309 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
310 | } else if (old_state == DCCP_REQUESTING) |
311 | sk->sk_err = ECONNRESET; | |
312 | ||
313 | dccp_clear_xmit_timers(sk); | |
314 | __skb_queue_purge(&sk->sk_receive_queue); | |
315 | if (sk->sk_send_head != NULL) { | |
316 | __kfree_skb(sk->sk_send_head); | |
317 | sk->sk_send_head = NULL; | |
318 | } | |
319 | ||
320 | inet->dport = 0; | |
321 | ||
322 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
323 | inet_reset_saddr(sk); | |
324 | ||
325 | sk->sk_shutdown = 0; | |
326 | sock_reset_flag(sk, SOCK_DONE); | |
327 | ||
328 | icsk->icsk_backoff = 0; | |
329 | inet_csk_delack_init(sk); | |
330 | __sk_dst_reset(sk); | |
331 | ||
332 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
333 | ||
334 | sk->sk_error_report(sk); | |
335 | return err; | |
336 | } | |
337 | ||
f21e68ca ACM |
338 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
339 | ||
331968bd ACM |
340 | /* |
341 | * Wait for a DCCP event. | |
342 | * | |
343 | * Note that we don't need to lock the socket, as the upper poll layers | |
344 | * take care of normal races (between the test and the event) and we don't | |
345 | * go look at any of the socket buffers directly. | |
346 | */ | |
f21e68ca ACM |
347 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
348 | poll_table *wait) | |
331968bd ACM |
349 | { |
350 | unsigned int mask; | |
351 | struct sock *sk = sock->sk; | |
352 | ||
353 | poll_wait(file, sk->sk_sleep, wait); | |
354 | if (sk->sk_state == DCCP_LISTEN) | |
355 | return inet_csk_listen_poll(sk); | |
356 | ||
357 | /* Socket is not locked. We are protected from async events | |
358 | by poll logic and correct handling of state changes | |
359 | made by another threads is impossible in any case. | |
360 | */ | |
361 | ||
362 | mask = 0; | |
363 | if (sk->sk_err) | |
364 | mask = POLLERR; | |
365 | ||
366 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
367 | mask |= POLLHUP; | |
368 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 369 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
370 | |
371 | /* Connected? */ | |
372 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
373 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
374 | mask |= POLLIN | POLLRDNORM; | |
375 | ||
376 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
377 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
378 | mask |= POLLOUT | POLLWRNORM; | |
379 | } else { /* send SIGIO later */ | |
380 | set_bit(SOCK_ASYNC_NOSPACE, | |
381 | &sk->sk_socket->flags); | |
382 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
383 | ||
384 | /* Race breaker. If space is freed after | |
385 | * wspace test but before the flags are set, | |
386 | * IO signal will be lost. | |
387 | */ | |
388 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
389 | mask |= POLLOUT | POLLWRNORM; | |
390 | } | |
391 | } | |
392 | } | |
393 | return mask; | |
394 | } | |
395 | ||
f21e68ca ACM |
396 | EXPORT_SYMBOL_GPL(dccp_poll); |
397 | ||
7c657876 ACM |
398 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
399 | { | |
6273172e ACM |
400 | int rc = -ENOTCONN; |
401 | ||
402 | lock_sock(sk); | |
403 | ||
404 | if (sk->sk_state == DCCP_LISTEN) | |
405 | goto out; | |
406 | ||
407 | switch (cmd) { | |
408 | case SIOCINQ: { | |
409 | struct sk_buff *skb; | |
410 | unsigned long amount = 0; | |
411 | ||
412 | skb = skb_peek(&sk->sk_receive_queue); | |
413 | if (skb != NULL) { | |
414 | /* | |
415 | * We will only return the amount of this packet since | |
416 | * that is all that will be read. | |
417 | */ | |
418 | amount = skb->len; | |
419 | } | |
420 | rc = put_user(amount, (int __user *)arg); | |
421 | } | |
422 | break; | |
423 | default: | |
424 | rc = -ENOIOCTLCMD; | |
425 | break; | |
426 | } | |
427 | out: | |
428 | release_sock(sk); | |
429 | return rc; | |
7c657876 ACM |
430 | } |
431 | ||
f21e68ca ACM |
432 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
433 | ||
60fe62e7 | 434 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
435 | char __user *optval, int optlen) |
436 | { | |
437 | struct dccp_sock *dp = dccp_sk(sk); | |
438 | struct dccp_service_list *sl = NULL; | |
439 | ||
8109b02b | 440 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
441 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
442 | return -EINVAL; | |
443 | ||
444 | if (optlen > sizeof(service)) { | |
445 | sl = kmalloc(optlen, GFP_KERNEL); | |
446 | if (sl == NULL) | |
447 | return -ENOMEM; | |
448 | ||
449 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
450 | if (copy_from_user(sl->dccpsl_list, | |
451 | optval + sizeof(service), | |
452 | optlen - sizeof(service)) || | |
453 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
454 | kfree(sl); | |
455 | return -EFAULT; | |
456 | } | |
457 | } | |
458 | ||
459 | lock_sock(sk); | |
460 | dp->dccps_service = service; | |
461 | ||
a51482bd | 462 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
463 | |
464 | dp->dccps_service_list = sl; | |
465 | release_sock(sk); | |
466 | return 0; | |
467 | } | |
468 | ||
afe00251 AB |
469 | /* byte 1 is feature. the rest is the preference list */ |
470 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
471 | struct dccp_so_feat __user *optval) | |
472 | { | |
473 | struct dccp_so_feat opt; | |
474 | u8 *val; | |
475 | int rc; | |
476 | ||
477 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
478 | return -EFAULT; | |
479 | ||
480 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
481 | if (!val) | |
482 | return -ENOMEM; | |
483 | ||
484 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
485 | rc = -EFAULT; | |
486 | goto out_free_val; | |
487 | } | |
488 | ||
8ca0d17b ACM |
489 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
490 | val, opt.dccpsf_len, GFP_KERNEL); | |
afe00251 AB |
491 | if (rc) |
492 | goto out_free_val; | |
493 | ||
494 | out: | |
495 | return rc; | |
496 | ||
497 | out_free_val: | |
498 | kfree(val); | |
499 | goto out; | |
500 | } | |
501 | ||
3fdadf7d DM |
502 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
503 | char __user *optval, int optlen) | |
7c657876 | 504 | { |
09dbc389 GR |
505 | struct dccp_sock *dp = dccp_sk(sk); |
506 | int val, err = 0; | |
7c657876 | 507 | |
a84ffe43 ACM |
508 | if (optlen < sizeof(int)) |
509 | return -EINVAL; | |
510 | ||
511 | if (get_user(val, (int __user *)optval)) | |
512 | return -EFAULT; | |
513 | ||
67e6b629 ACM |
514 | if (optname == DCCP_SOCKOPT_SERVICE) |
515 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 516 | |
67e6b629 | 517 | lock_sock(sk); |
a84ffe43 ACM |
518 | switch (optname) { |
519 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 520 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 521 | err = 0; |
a84ffe43 | 522 | break; |
afe00251 AB |
523 | case DCCP_SOCKOPT_CHANGE_L: |
524 | if (optlen != sizeof(struct dccp_so_feat)) | |
525 | err = -EINVAL; | |
526 | else | |
527 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
c9eaf173 | 528 | (struct dccp_so_feat __user *) |
afe00251 AB |
529 | optval); |
530 | break; | |
afe00251 AB |
531 | case DCCP_SOCKOPT_CHANGE_R: |
532 | if (optlen != sizeof(struct dccp_so_feat)) | |
533 | err = -EINVAL; | |
534 | else | |
535 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
9faefb6d | 536 | (struct dccp_so_feat __user *) |
afe00251 AB |
537 | optval); |
538 | break; | |
b8599d20 GR |
539 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
540 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
541 | err = -EOPNOTSUPP; | |
542 | else | |
543 | dp->dccps_server_timewait = (val != 0); | |
544 | break; | |
6f4e5fff GR |
545 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
546 | if (val < 0 || val > 15) | |
547 | err = -EINVAL; | |
548 | else | |
549 | dp->dccps_pcslen = val; | |
550 | break; | |
551 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ | |
552 | if (val < 0 || val > 15) | |
553 | err = -EINVAL; | |
554 | else { | |
555 | dp->dccps_pcrlen = val; | |
556 | /* FIXME: add feature negotiation, | |
557 | * ChangeL(MinimumChecksumCoverage, val) */ | |
558 | } | |
559 | break; | |
a84ffe43 ACM |
560 | default: |
561 | err = -ENOPROTOOPT; | |
562 | break; | |
563 | } | |
6f4e5fff | 564 | |
a84ffe43 ACM |
565 | release_sock(sk); |
566 | return err; | |
7c657876 ACM |
567 | } |
568 | ||
3fdadf7d DM |
569 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
570 | char __user *optval, int optlen) | |
571 | { | |
572 | if (level != SOL_DCCP) | |
573 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
574 | optname, optval, | |
575 | optlen); | |
576 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
577 | } | |
543d9cfe | 578 | |
f21e68ca ACM |
579 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
580 | ||
3fdadf7d DM |
581 | #ifdef CONFIG_COMPAT |
582 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 583 | char __user *optval, int optlen) |
3fdadf7d | 584 | { |
dec73ff0 ACM |
585 | if (level != SOL_DCCP) |
586 | return inet_csk_compat_setsockopt(sk, level, optname, | |
587 | optval, optlen); | |
3fdadf7d DM |
588 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
589 | } | |
543d9cfe | 590 | |
3fdadf7d DM |
591 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
592 | #endif | |
593 | ||
67e6b629 | 594 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 595 | __be32 __user *optval, |
67e6b629 ACM |
596 | int __user *optlen) |
597 | { | |
598 | const struct dccp_sock *dp = dccp_sk(sk); | |
599 | const struct dccp_service_list *sl; | |
600 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
601 | ||
602 | lock_sock(sk); | |
67e6b629 ACM |
603 | if ((sl = dp->dccps_service_list) != NULL) { |
604 | slen = sl->dccpsl_nr * sizeof(u32); | |
605 | total_len += slen; | |
606 | } | |
607 | ||
608 | err = -EINVAL; | |
609 | if (total_len > len) | |
610 | goto out; | |
611 | ||
612 | err = 0; | |
613 | if (put_user(total_len, optlen) || | |
614 | put_user(dp->dccps_service, optval) || | |
615 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
616 | err = -EFAULT; | |
617 | out: | |
618 | release_sock(sk); | |
619 | return err; | |
620 | } | |
621 | ||
3fdadf7d | 622 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 623 | char __user *optval, int __user *optlen) |
7c657876 | 624 | { |
a84ffe43 ACM |
625 | struct dccp_sock *dp; |
626 | int val, len; | |
7c657876 | 627 | |
a84ffe43 ACM |
628 | if (get_user(len, optlen)) |
629 | return -EFAULT; | |
630 | ||
39ebc027 | 631 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
632 | return -EINVAL; |
633 | ||
634 | dp = dccp_sk(sk); | |
635 | ||
636 | switch (optname) { | |
637 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 638 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 639 | return 0; |
88f964db ACM |
640 | case DCCP_SOCKOPT_SERVICE: |
641 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 642 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
643 | case DCCP_SOCKOPT_GET_CUR_MPS: |
644 | val = dp->dccps_mss_cache; | |
7c559a9e | 645 | break; |
b8599d20 GR |
646 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
647 | val = dp->dccps_server_timewait; | |
b8599d20 | 648 | break; |
6f4e5fff GR |
649 | case DCCP_SOCKOPT_SEND_CSCOV: |
650 | val = dp->dccps_pcslen; | |
651 | break; | |
652 | case DCCP_SOCKOPT_RECV_CSCOV: | |
653 | val = dp->dccps_pcrlen; | |
654 | break; | |
88f964db ACM |
655 | case 128 ... 191: |
656 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
657 | len, (u32 __user *)optval, optlen); | |
658 | case 192 ... 255: | |
659 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
660 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
661 | default: |
662 | return -ENOPROTOOPT; | |
663 | } | |
664 | ||
79133506 | 665 | len = sizeof(val); |
a84ffe43 ACM |
666 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
667 | return -EFAULT; | |
668 | ||
669 | return 0; | |
7c657876 ACM |
670 | } |
671 | ||
3fdadf7d DM |
672 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
673 | char __user *optval, int __user *optlen) | |
674 | { | |
675 | if (level != SOL_DCCP) | |
676 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
677 | optname, optval, | |
678 | optlen); | |
679 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
680 | } | |
543d9cfe | 681 | |
f21e68ca ACM |
682 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
683 | ||
3fdadf7d DM |
684 | #ifdef CONFIG_COMPAT |
685 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 686 | char __user *optval, int __user *optlen) |
3fdadf7d | 687 | { |
dec73ff0 ACM |
688 | if (level != SOL_DCCP) |
689 | return inet_csk_compat_getsockopt(sk, level, optname, | |
690 | optval, optlen); | |
3fdadf7d DM |
691 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
692 | } | |
543d9cfe | 693 | |
3fdadf7d DM |
694 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
695 | #endif | |
696 | ||
7c657876 ACM |
697 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
698 | size_t len) | |
699 | { | |
700 | const struct dccp_sock *dp = dccp_sk(sk); | |
701 | const int flags = msg->msg_flags; | |
702 | const int noblock = flags & MSG_DONTWAIT; | |
703 | struct sk_buff *skb; | |
704 | int rc, size; | |
705 | long timeo; | |
706 | ||
707 | if (len > dp->dccps_mss_cache) | |
708 | return -EMSGSIZE; | |
709 | ||
710 | lock_sock(sk); | |
b1308dc0 IM |
711 | |
712 | if (sysctl_dccp_tx_qlen && | |
713 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
714 | rc = -EAGAIN; | |
715 | goto out_release; | |
716 | } | |
717 | ||
27258ee5 | 718 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
719 | |
720 | /* | |
721 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
722 | * so that the trick in dccp_rcv_request_sent_state_process. | |
723 | */ | |
724 | /* Wait for a connection to finish. */ | |
cecd8d0e | 725 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 726 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 727 | goto out_release; |
7c657876 ACM |
728 | |
729 | size = sk->sk_prot->max_header + len; | |
730 | release_sock(sk); | |
731 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
732 | lock_sock(sk); | |
7c657876 ACM |
733 | if (skb == NULL) |
734 | goto out_release; | |
735 | ||
736 | skb_reserve(skb, sk->sk_prot->max_header); | |
737 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
738 | if (rc != 0) |
739 | goto out_discard; | |
740 | ||
97e5848d IM |
741 | skb_queue_tail(&sk->sk_write_queue, skb); |
742 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
743 | out_release: |
744 | release_sock(sk); | |
745 | return rc ? : len; | |
27258ee5 ACM |
746 | out_discard: |
747 | kfree_skb(skb); | |
7c657876 | 748 | goto out_release; |
7c657876 ACM |
749 | } |
750 | ||
f21e68ca ACM |
751 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
752 | ||
7c657876 ACM |
753 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
754 | size_t len, int nonblock, int flags, int *addr_len) | |
755 | { | |
756 | const struct dccp_hdr *dh; | |
7c657876 ACM |
757 | long timeo; |
758 | ||
759 | lock_sock(sk); | |
760 | ||
531669a0 ACM |
761 | if (sk->sk_state == DCCP_LISTEN) { |
762 | len = -ENOTCONN; | |
7c657876 | 763 | goto out; |
7c657876 | 764 | } |
7c657876 | 765 | |
531669a0 | 766 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
767 | |
768 | do { | |
531669a0 | 769 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 770 | |
531669a0 ACM |
771 | if (skb == NULL) |
772 | goto verify_sock_status; | |
7c657876 | 773 | |
531669a0 | 774 | dh = dccp_hdr(skb); |
7c657876 | 775 | |
0c869620 GR |
776 | switch (dh->dccph_type) { |
777 | case DCCP_PKT_DATA: | |
778 | case DCCP_PKT_DATAACK: | |
531669a0 | 779 | goto found_ok_skb; |
7c657876 | 780 | |
0c869620 GR |
781 | case DCCP_PKT_CLOSE: |
782 | case DCCP_PKT_CLOSEREQ: | |
783 | if (!(flags & MSG_PEEK)) | |
784 | dccp_finish_passive_close(sk); | |
785 | /* fall through */ | |
786 | case DCCP_PKT_RESET: | |
787 | dccp_pr_debug("found fin (%s) ok!\n", | |
788 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
789 | len = 0; |
790 | goto found_fin_ok; | |
0c869620 GR |
791 | default: |
792 | dccp_pr_debug("packet_type=%s\n", | |
793 | dccp_packet_name(dh->dccph_type)); | |
794 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 795 | } |
531669a0 ACM |
796 | verify_sock_status: |
797 | if (sock_flag(sk, SOCK_DONE)) { | |
798 | len = 0; | |
7c657876 | 799 | break; |
531669a0 | 800 | } |
7c657876 | 801 | |
531669a0 ACM |
802 | if (sk->sk_err) { |
803 | len = sock_error(sk); | |
804 | break; | |
805 | } | |
7c657876 | 806 | |
531669a0 ACM |
807 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
808 | len = 0; | |
809 | break; | |
810 | } | |
7c657876 | 811 | |
531669a0 ACM |
812 | if (sk->sk_state == DCCP_CLOSED) { |
813 | if (!sock_flag(sk, SOCK_DONE)) { | |
814 | /* This occurs when user tries to read | |
815 | * from never connected socket. | |
816 | */ | |
817 | len = -ENOTCONN; | |
7c657876 ACM |
818 | break; |
819 | } | |
531669a0 ACM |
820 | len = 0; |
821 | break; | |
7c657876 ACM |
822 | } |
823 | ||
531669a0 ACM |
824 | if (!timeo) { |
825 | len = -EAGAIN; | |
826 | break; | |
827 | } | |
7c657876 | 828 | |
531669a0 ACM |
829 | if (signal_pending(current)) { |
830 | len = sock_intr_errno(timeo); | |
831 | break; | |
832 | } | |
7c657876 | 833 | |
531669a0 | 834 | sk_wait_data(sk, &timeo); |
7c657876 | 835 | continue; |
7c657876 | 836 | found_ok_skb: |
531669a0 ACM |
837 | if (len > skb->len) |
838 | len = skb->len; | |
839 | else if (len < skb->len) | |
840 | msg->msg_flags |= MSG_TRUNC; | |
841 | ||
842 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
843 | /* Exception. Bailout! */ | |
844 | len = -EFAULT; | |
845 | break; | |
7c657876 | 846 | } |
7c657876 ACM |
847 | found_fin_ok: |
848 | if (!(flags & MSG_PEEK)) | |
624d1164 | 849 | sk_eat_skb(sk, skb, 0); |
7c657876 | 850 | break; |
531669a0 | 851 | } while (1); |
7c657876 ACM |
852 | out: |
853 | release_sock(sk); | |
531669a0 | 854 | return len; |
7c657876 ACM |
855 | } |
856 | ||
f21e68ca ACM |
857 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
858 | ||
859 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
860 | { |
861 | struct sock *sk = sock->sk; | |
862 | unsigned char old_state; | |
863 | int err; | |
864 | ||
865 | lock_sock(sk); | |
866 | ||
867 | err = -EINVAL; | |
868 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
869 | goto out; | |
870 | ||
871 | old_state = sk->sk_state; | |
872 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
873 | goto out; | |
874 | ||
875 | /* Really, if the socket is already in listen state | |
876 | * we can only allow the backlog to be adjusted. | |
877 | */ | |
878 | if (old_state != DCCP_LISTEN) { | |
879 | /* | |
880 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
881 | * see tcp_listen_start | |
882 | */ | |
72a3effa | 883 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
884 | if (err) |
885 | goto out; | |
886 | } | |
887 | sk->sk_max_ack_backlog = backlog; | |
888 | err = 0; | |
889 | ||
890 | out: | |
891 | release_sock(sk); | |
892 | return err; | |
893 | } | |
894 | ||
f21e68ca ACM |
895 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
896 | ||
0c869620 | 897 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 898 | { |
0c869620 | 899 | u8 next_state = DCCP_CLOSED; |
7c657876 | 900 | |
0c869620 GR |
901 | switch (sk->sk_state) { |
902 | case DCCP_PASSIVE_CLOSE: | |
903 | case DCCP_PASSIVE_CLOSEREQ: | |
904 | dccp_finish_passive_close(sk); | |
905 | break; | |
906 | case DCCP_PARTOPEN: | |
907 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
908 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
909 | /* fall through */ | |
910 | case DCCP_OPEN: | |
911 | dccp_send_close(sk, 1); | |
7c657876 | 912 | |
b8599d20 GR |
913 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
914 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
915 | next_state = DCCP_ACTIVE_CLOSEREQ; |
916 | else | |
917 | next_state = DCCP_CLOSING; | |
918 | /* fall through */ | |
919 | default: | |
920 | dccp_set_state(sk, next_state); | |
921 | } | |
7c657876 ACM |
922 | } |
923 | ||
924 | void dccp_close(struct sock *sk, long timeout) | |
925 | { | |
97e5848d | 926 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 927 | struct sk_buff *skb; |
d83bd95b | 928 | u32 data_was_unread = 0; |
134af346 | 929 | int state; |
7c657876 ACM |
930 | |
931 | lock_sock(sk); | |
932 | ||
933 | sk->sk_shutdown = SHUTDOWN_MASK; | |
934 | ||
935 | if (sk->sk_state == DCCP_LISTEN) { | |
936 | dccp_set_state(sk, DCCP_CLOSED); | |
937 | ||
938 | /* Special case. */ | |
939 | inet_csk_listen_stop(sk); | |
940 | ||
941 | goto adjudge_to_death; | |
942 | } | |
943 | ||
97e5848d IM |
944 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
945 | ||
7c657876 ACM |
946 | /* |
947 | * We need to flush the recv. buffs. We do this only on the | |
948 | * descriptor close, not protocol-sourced closes, because the | |
949 | *reader process may not have drained the data yet! | |
950 | */ | |
7c657876 | 951 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 952 | data_was_unread += skb->len; |
7c657876 ACM |
953 | __kfree_skb(skb); |
954 | } | |
955 | ||
d83bd95b GR |
956 | if (data_was_unread) { |
957 | /* Unread data was tossed, send an appropriate Reset Code */ | |
958 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
959 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
960 | dccp_set_state(sk, DCCP_CLOSED); | |
961 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
962 | /* Check zero linger _after_ checking for unread data. */ |
963 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
964 | } else if (sk->sk_state != DCCP_CLOSED) { |
965 | dccp_terminate_connection(sk); | |
7c657876 ACM |
966 | } |
967 | ||
968 | sk_stream_wait_close(sk, timeout); | |
969 | ||
970 | adjudge_to_death: | |
134af346 HX |
971 | state = sk->sk_state; |
972 | sock_hold(sk); | |
973 | sock_orphan(sk); | |
974 | atomic_inc(sk->sk_prot->orphan_count); | |
975 | ||
7ad07e7c ACM |
976 | /* |
977 | * It is the last release_sock in its life. It will remove backlog. | |
978 | */ | |
7c657876 ACM |
979 | release_sock(sk); |
980 | /* | |
981 | * Now socket is owned by kernel and we acquire BH lock | |
982 | * to finish close. No need to check for user refs. | |
983 | */ | |
984 | local_bh_disable(); | |
985 | bh_lock_sock(sk); | |
986 | BUG_TRAP(!sock_owned_by_user(sk)); | |
987 | ||
134af346 HX |
988 | /* Have we already been destroyed by a softirq or backlog? */ |
989 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
990 | goto out; | |
7ad07e7c | 991 | |
7c657876 ACM |
992 | if (sk->sk_state == DCCP_CLOSED) |
993 | inet_csk_destroy_sock(sk); | |
994 | ||
995 | /* Otherwise, socket is reprieved until protocol close. */ | |
996 | ||
134af346 | 997 | out: |
7c657876 ACM |
998 | bh_unlock_sock(sk); |
999 | local_bh_enable(); | |
1000 | sock_put(sk); | |
1001 | } | |
1002 | ||
f21e68ca ACM |
1003 | EXPORT_SYMBOL_GPL(dccp_close); |
1004 | ||
7c657876 ACM |
1005 | void dccp_shutdown(struct sock *sk, int how) |
1006 | { | |
8e8c71f1 | 1007 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1008 | } |
1009 | ||
f21e68ca ACM |
1010 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1011 | ||
24e8b7e4 | 1012 | static inline int dccp_mib_init(void) |
7c657876 | 1013 | { |
24e8b7e4 | 1014 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
7c657876 ACM |
1015 | } |
1016 | ||
24e8b7e4 | 1017 | static inline void dccp_mib_exit(void) |
46f09ffa | 1018 | { |
24e8b7e4 | 1019 | snmp_mib_free((void**)dccp_statistics); |
46f09ffa ACM |
1020 | } |
1021 | ||
7c657876 ACM |
1022 | static int thash_entries; |
1023 | module_param(thash_entries, int, 0444); | |
1024 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1025 | ||
a1d3a355 | 1026 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1027 | int dccp_debug; |
042d18f9 | 1028 | module_param(dccp_debug, bool, 0444); |
7c657876 | 1029 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1030 | |
1031 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1032 | #endif |
7c657876 ACM |
1033 | |
1034 | static int __init dccp_init(void) | |
1035 | { | |
1036 | unsigned long goal; | |
1037 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1038 | int rc = -ENOBUFS; |
7c657876 | 1039 | |
028b0275 PM |
1040 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1041 | FIELD_SIZEOF(struct sk_buff, cb)); | |
1042 | ||
7690af3f ACM |
1043 | dccp_hashinfo.bind_bucket_cachep = |
1044 | kmem_cache_create("dccp_bind_bucket", | |
1045 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1046 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1047 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1048 | goto out; |
7c657876 ACM |
1049 | |
1050 | /* | |
1051 | * Size and allocate the main established and bind bucket | |
1052 | * hash tables. | |
1053 | * | |
1054 | * The methodology is similar to that of the buffer cache. | |
1055 | */ | |
1056 | if (num_physpages >= (128 * 1024)) | |
1057 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1058 | else | |
1059 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1060 | ||
1061 | if (thash_entries) | |
7690af3f ACM |
1062 | goal = (thash_entries * |
1063 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1064 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1065 | ; | |
1066 | do { | |
1067 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1068 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1069 | while (dccp_hashinfo.ehash_size & |
1070 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1071 | dccp_hashinfo.ehash_size--; |
1072 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1073 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1074 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1075 | ||
1076 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1077 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1078 | goto out_free_bind_bucket_cachep; |
1079 | } | |
1080 | ||
dbca9b27 | 1081 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1082 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1083 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1084 | } |
1085 | ||
230140cf ED |
1086 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1087 | goto out_free_dccp_ehash; | |
1088 | ||
7c657876 ACM |
1089 | bhash_order = ehash_order; |
1090 | ||
1091 | do { | |
1092 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1093 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1094 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1095 | bhash_order > 0) | |
7c657876 ACM |
1096 | continue; |
1097 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1098 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1099 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1100 | ||
1101 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1102 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1103 | goto out_free_dccp_locks; |
7c657876 ACM |
1104 | } |
1105 | ||
1106 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1107 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1108 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1109 | } | |
1110 | ||
46f09ffa | 1111 | rc = dccp_mib_init(); |
fa23e2ec | 1112 | if (rc) |
7c657876 ACM |
1113 | goto out_free_dccp_bhash; |
1114 | ||
9b07ef5d | 1115 | rc = dccp_ackvec_init(); |
7c657876 | 1116 | if (rc) |
b61fafc4 | 1117 | goto out_free_dccp_mib; |
9b07ef5d | 1118 | |
e55d912f | 1119 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1120 | if (rc) |
1121 | goto out_ackvec_exit; | |
4c70f383 GR |
1122 | |
1123 | dccp_timestamping_init(); | |
7c657876 ACM |
1124 | out: |
1125 | return rc; | |
9b07ef5d ACM |
1126 | out_ackvec_exit: |
1127 | dccp_ackvec_exit(); | |
b61fafc4 | 1128 | out_free_dccp_mib: |
46f09ffa | 1129 | dccp_mib_exit(); |
7c657876 ACM |
1130 | out_free_dccp_bhash: |
1131 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1132 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1133 | out_free_dccp_locks: |
1134 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1135 | out_free_dccp_ehash: |
1136 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1137 | dccp_hashinfo.ehash = NULL; | |
1138 | out_free_bind_bucket_cachep: | |
1139 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1140 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1141 | goto out; |
1142 | } | |
1143 | ||
7c657876 ACM |
1144 | static void __exit dccp_fini(void) |
1145 | { | |
46f09ffa | 1146 | dccp_mib_exit(); |
725ba8ee ACM |
1147 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1148 | get_order(dccp_hashinfo.bhash_size * | |
1149 | sizeof(struct inet_bind_hashbucket))); | |
1150 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1151 | get_order(dccp_hashinfo.ehash_size * | |
1152 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1153 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1154 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1155 | dccp_ackvec_exit(); |
e55d912f | 1156 | dccp_sysctl_exit(); |
7c657876 ACM |
1157 | } |
1158 | ||
1159 | module_init(dccp_init); | |
1160 | module_exit(dccp_fini); | |
1161 | ||
7c657876 ACM |
1162 | MODULE_LICENSE("GPL"); |
1163 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1164 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |