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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 | ||
7d06b2e0 | 240 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
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 | ||
273 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
274 | ||
72a3effa | 275 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 276 | { |
67e6b629 ACM |
277 | struct dccp_sock *dp = dccp_sk(sk); |
278 | ||
279 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
72a3effa | 280 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
281 | } |
282 | ||
ce865a61 GR |
283 | static inline int dccp_need_reset(int state) |
284 | { | |
285 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
286 | state != DCCP_REQUESTING; | |
287 | } | |
288 | ||
7c657876 ACM |
289 | int dccp_disconnect(struct sock *sk, int flags) |
290 | { | |
291 | struct inet_connection_sock *icsk = inet_csk(sk); | |
292 | struct inet_sock *inet = inet_sk(sk); | |
293 | int err = 0; | |
294 | const int old_state = sk->sk_state; | |
295 | ||
296 | if (old_state != DCCP_CLOSED) | |
297 | dccp_set_state(sk, DCCP_CLOSED); | |
298 | ||
ce865a61 GR |
299 | /* |
300 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
301 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
302 | */ | |
7c657876 ACM |
303 | if (old_state == DCCP_LISTEN) { |
304 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
305 | } else if (dccp_need_reset(old_state)) { |
306 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
307 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
308 | } else if (old_state == DCCP_REQUESTING) |
309 | sk->sk_err = ECONNRESET; | |
310 | ||
311 | dccp_clear_xmit_timers(sk); | |
312 | __skb_queue_purge(&sk->sk_receive_queue); | |
313 | if (sk->sk_send_head != NULL) { | |
314 | __kfree_skb(sk->sk_send_head); | |
315 | sk->sk_send_head = NULL; | |
316 | } | |
317 | ||
318 | inet->dport = 0; | |
319 | ||
320 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
321 | inet_reset_saddr(sk); | |
322 | ||
323 | sk->sk_shutdown = 0; | |
324 | sock_reset_flag(sk, SOCK_DONE); | |
325 | ||
326 | icsk->icsk_backoff = 0; | |
327 | inet_csk_delack_init(sk); | |
328 | __sk_dst_reset(sk); | |
329 | ||
547b792c | 330 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
7c657876 ACM |
331 | |
332 | sk->sk_error_report(sk); | |
333 | return err; | |
334 | } | |
335 | ||
f21e68ca ACM |
336 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
337 | ||
331968bd ACM |
338 | /* |
339 | * Wait for a DCCP event. | |
340 | * | |
341 | * Note that we don't need to lock the socket, as the upper poll layers | |
342 | * take care of normal races (between the test and the event) and we don't | |
343 | * go look at any of the socket buffers directly. | |
344 | */ | |
f21e68ca ACM |
345 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
346 | poll_table *wait) | |
331968bd ACM |
347 | { |
348 | unsigned int mask; | |
349 | struct sock *sk = sock->sk; | |
350 | ||
351 | poll_wait(file, sk->sk_sleep, wait); | |
352 | if (sk->sk_state == DCCP_LISTEN) | |
353 | return inet_csk_listen_poll(sk); | |
354 | ||
355 | /* Socket is not locked. We are protected from async events | |
356 | by poll logic and correct handling of state changes | |
357 | made by another threads is impossible in any case. | |
358 | */ | |
359 | ||
360 | mask = 0; | |
361 | if (sk->sk_err) | |
362 | mask = POLLERR; | |
363 | ||
364 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
365 | mask |= POLLHUP; | |
366 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 367 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
368 | |
369 | /* Connected? */ | |
370 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
371 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
372 | mask |= POLLIN | POLLRDNORM; | |
373 | ||
374 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
375 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
376 | mask |= POLLOUT | POLLWRNORM; | |
377 | } else { /* send SIGIO later */ | |
378 | set_bit(SOCK_ASYNC_NOSPACE, | |
379 | &sk->sk_socket->flags); | |
380 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
381 | ||
382 | /* Race breaker. If space is freed after | |
383 | * wspace test but before the flags are set, | |
384 | * IO signal will be lost. | |
385 | */ | |
386 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
387 | mask |= POLLOUT | POLLWRNORM; | |
388 | } | |
389 | } | |
390 | } | |
391 | return mask; | |
392 | } | |
393 | ||
f21e68ca ACM |
394 | EXPORT_SYMBOL_GPL(dccp_poll); |
395 | ||
7c657876 ACM |
396 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
397 | { | |
6273172e ACM |
398 | int rc = -ENOTCONN; |
399 | ||
400 | lock_sock(sk); | |
401 | ||
402 | if (sk->sk_state == DCCP_LISTEN) | |
403 | goto out; | |
404 | ||
405 | switch (cmd) { | |
406 | case SIOCINQ: { | |
407 | struct sk_buff *skb; | |
408 | unsigned long amount = 0; | |
409 | ||
410 | skb = skb_peek(&sk->sk_receive_queue); | |
411 | if (skb != NULL) { | |
412 | /* | |
413 | * We will only return the amount of this packet since | |
414 | * that is all that will be read. | |
415 | */ | |
416 | amount = skb->len; | |
417 | } | |
418 | rc = put_user(amount, (int __user *)arg); | |
419 | } | |
420 | break; | |
421 | default: | |
422 | rc = -ENOIOCTLCMD; | |
423 | break; | |
424 | } | |
425 | out: | |
426 | release_sock(sk); | |
427 | return rc; | |
7c657876 ACM |
428 | } |
429 | ||
f21e68ca ACM |
430 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
431 | ||
60fe62e7 | 432 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
433 | char __user *optval, int optlen) |
434 | { | |
435 | struct dccp_sock *dp = dccp_sk(sk); | |
436 | struct dccp_service_list *sl = NULL; | |
437 | ||
8109b02b | 438 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
439 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
440 | return -EINVAL; | |
441 | ||
442 | if (optlen > sizeof(service)) { | |
443 | sl = kmalloc(optlen, GFP_KERNEL); | |
444 | if (sl == NULL) | |
445 | return -ENOMEM; | |
446 | ||
447 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
448 | if (copy_from_user(sl->dccpsl_list, | |
449 | optval + sizeof(service), | |
450 | optlen - sizeof(service)) || | |
451 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
452 | kfree(sl); | |
453 | return -EFAULT; | |
454 | } | |
455 | } | |
456 | ||
457 | lock_sock(sk); | |
458 | dp->dccps_service = service; | |
459 | ||
a51482bd | 460 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
461 | |
462 | dp->dccps_service_list = sl; | |
463 | release_sock(sk); | |
464 | return 0; | |
465 | } | |
466 | ||
afe00251 AB |
467 | /* byte 1 is feature. the rest is the preference list */ |
468 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
469 | struct dccp_so_feat __user *optval) | |
470 | { | |
471 | struct dccp_so_feat opt; | |
472 | u8 *val; | |
473 | int rc; | |
474 | ||
475 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
476 | return -EFAULT; | |
3e8a0a55 ACM |
477 | /* |
478 | * rfc4340: 6.1. Change Options | |
479 | */ | |
480 | if (opt.dccpsf_len < 1) | |
481 | return -EINVAL; | |
afe00251 AB |
482 | |
483 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
484 | if (!val) | |
485 | return -ENOMEM; | |
486 | ||
487 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
488 | rc = -EFAULT; | |
489 | goto out_free_val; | |
490 | } | |
491 | ||
8ca0d17b ACM |
492 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
493 | val, opt.dccpsf_len, GFP_KERNEL); | |
afe00251 AB |
494 | if (rc) |
495 | goto out_free_val; | |
496 | ||
497 | out: | |
498 | return rc; | |
499 | ||
500 | out_free_val: | |
501 | kfree(val); | |
502 | goto out; | |
503 | } | |
504 | ||
3fdadf7d DM |
505 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
506 | char __user *optval, int optlen) | |
7c657876 | 507 | { |
09dbc389 GR |
508 | struct dccp_sock *dp = dccp_sk(sk); |
509 | int val, err = 0; | |
7c657876 | 510 | |
a84ffe43 ACM |
511 | if (optlen < sizeof(int)) |
512 | return -EINVAL; | |
513 | ||
514 | if (get_user(val, (int __user *)optval)) | |
515 | return -EFAULT; | |
516 | ||
67e6b629 ACM |
517 | if (optname == DCCP_SOCKOPT_SERVICE) |
518 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 519 | |
67e6b629 | 520 | lock_sock(sk); |
a84ffe43 ACM |
521 | switch (optname) { |
522 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 523 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 524 | err = 0; |
a84ffe43 | 525 | break; |
afe00251 AB |
526 | case DCCP_SOCKOPT_CHANGE_L: |
527 | if (optlen != sizeof(struct dccp_so_feat)) | |
528 | err = -EINVAL; | |
529 | else | |
530 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
c9eaf173 | 531 | (struct dccp_so_feat __user *) |
afe00251 AB |
532 | optval); |
533 | break; | |
afe00251 AB |
534 | case DCCP_SOCKOPT_CHANGE_R: |
535 | if (optlen != sizeof(struct dccp_so_feat)) | |
536 | err = -EINVAL; | |
537 | else | |
538 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
9faefb6d | 539 | (struct dccp_so_feat __user *) |
afe00251 AB |
540 | optval); |
541 | break; | |
b8599d20 GR |
542 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
543 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
544 | err = -EOPNOTSUPP; | |
545 | else | |
546 | dp->dccps_server_timewait = (val != 0); | |
547 | break; | |
6f4e5fff GR |
548 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
549 | if (val < 0 || val > 15) | |
550 | err = -EINVAL; | |
551 | else | |
552 | dp->dccps_pcslen = val; | |
553 | break; | |
554 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ | |
555 | if (val < 0 || val > 15) | |
556 | err = -EINVAL; | |
557 | else { | |
558 | dp->dccps_pcrlen = val; | |
559 | /* FIXME: add feature negotiation, | |
560 | * ChangeL(MinimumChecksumCoverage, val) */ | |
561 | } | |
562 | break; | |
a84ffe43 ACM |
563 | default: |
564 | err = -ENOPROTOOPT; | |
565 | break; | |
566 | } | |
6f4e5fff | 567 | |
a84ffe43 ACM |
568 | release_sock(sk); |
569 | return err; | |
7c657876 ACM |
570 | } |
571 | ||
3fdadf7d DM |
572 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
573 | char __user *optval, int optlen) | |
574 | { | |
575 | if (level != SOL_DCCP) | |
576 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
577 | optname, optval, | |
578 | optlen); | |
579 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
580 | } | |
543d9cfe | 581 | |
f21e68ca ACM |
582 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
583 | ||
3fdadf7d DM |
584 | #ifdef CONFIG_COMPAT |
585 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 586 | char __user *optval, int optlen) |
3fdadf7d | 587 | { |
dec73ff0 ACM |
588 | if (level != SOL_DCCP) |
589 | return inet_csk_compat_setsockopt(sk, level, optname, | |
590 | optval, optlen); | |
3fdadf7d DM |
591 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
592 | } | |
543d9cfe | 593 | |
3fdadf7d DM |
594 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
595 | #endif | |
596 | ||
67e6b629 | 597 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 598 | __be32 __user *optval, |
67e6b629 ACM |
599 | int __user *optlen) |
600 | { | |
601 | const struct dccp_sock *dp = dccp_sk(sk); | |
602 | const struct dccp_service_list *sl; | |
603 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
604 | ||
605 | lock_sock(sk); | |
67e6b629 ACM |
606 | if ((sl = dp->dccps_service_list) != NULL) { |
607 | slen = sl->dccpsl_nr * sizeof(u32); | |
608 | total_len += slen; | |
609 | } | |
610 | ||
611 | err = -EINVAL; | |
612 | if (total_len > len) | |
613 | goto out; | |
614 | ||
615 | err = 0; | |
616 | if (put_user(total_len, optlen) || | |
617 | put_user(dp->dccps_service, optval) || | |
618 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
619 | err = -EFAULT; | |
620 | out: | |
621 | release_sock(sk); | |
622 | return err; | |
623 | } | |
624 | ||
3fdadf7d | 625 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 626 | char __user *optval, int __user *optlen) |
7c657876 | 627 | { |
a84ffe43 ACM |
628 | struct dccp_sock *dp; |
629 | int val, len; | |
7c657876 | 630 | |
a84ffe43 ACM |
631 | if (get_user(len, optlen)) |
632 | return -EFAULT; | |
633 | ||
39ebc027 | 634 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
635 | return -EINVAL; |
636 | ||
637 | dp = dccp_sk(sk); | |
638 | ||
639 | switch (optname) { | |
640 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 641 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 642 | return 0; |
88f964db ACM |
643 | case DCCP_SOCKOPT_SERVICE: |
644 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 645 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
646 | case DCCP_SOCKOPT_GET_CUR_MPS: |
647 | val = dp->dccps_mss_cache; | |
7c559a9e | 648 | break; |
b8599d20 GR |
649 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
650 | val = dp->dccps_server_timewait; | |
b8599d20 | 651 | break; |
6f4e5fff GR |
652 | case DCCP_SOCKOPT_SEND_CSCOV: |
653 | val = dp->dccps_pcslen; | |
654 | break; | |
655 | case DCCP_SOCKOPT_RECV_CSCOV: | |
656 | val = dp->dccps_pcrlen; | |
657 | break; | |
88f964db ACM |
658 | case 128 ... 191: |
659 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
660 | len, (u32 __user *)optval, optlen); | |
661 | case 192 ... 255: | |
662 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
663 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
664 | default: |
665 | return -ENOPROTOOPT; | |
666 | } | |
667 | ||
79133506 | 668 | len = sizeof(val); |
a84ffe43 ACM |
669 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
670 | return -EFAULT; | |
671 | ||
672 | return 0; | |
7c657876 ACM |
673 | } |
674 | ||
3fdadf7d DM |
675 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
676 | char __user *optval, int __user *optlen) | |
677 | { | |
678 | if (level != SOL_DCCP) | |
679 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
680 | optname, optval, | |
681 | optlen); | |
682 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
683 | } | |
543d9cfe | 684 | |
f21e68ca ACM |
685 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
686 | ||
3fdadf7d DM |
687 | #ifdef CONFIG_COMPAT |
688 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 689 | char __user *optval, int __user *optlen) |
3fdadf7d | 690 | { |
dec73ff0 ACM |
691 | if (level != SOL_DCCP) |
692 | return inet_csk_compat_getsockopt(sk, level, optname, | |
693 | optval, optlen); | |
3fdadf7d DM |
694 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
695 | } | |
543d9cfe | 696 | |
3fdadf7d DM |
697 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
698 | #endif | |
699 | ||
7c657876 ACM |
700 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
701 | size_t len) | |
702 | { | |
703 | const struct dccp_sock *dp = dccp_sk(sk); | |
704 | const int flags = msg->msg_flags; | |
705 | const int noblock = flags & MSG_DONTWAIT; | |
706 | struct sk_buff *skb; | |
707 | int rc, size; | |
708 | long timeo; | |
709 | ||
710 | if (len > dp->dccps_mss_cache) | |
711 | return -EMSGSIZE; | |
712 | ||
713 | lock_sock(sk); | |
b1308dc0 IM |
714 | |
715 | if (sysctl_dccp_tx_qlen && | |
716 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
717 | rc = -EAGAIN; | |
718 | goto out_release; | |
719 | } | |
720 | ||
27258ee5 | 721 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
722 | |
723 | /* | |
724 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
725 | * so that the trick in dccp_rcv_request_sent_state_process. | |
726 | */ | |
727 | /* Wait for a connection to finish. */ | |
cecd8d0e | 728 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 729 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 730 | goto out_release; |
7c657876 ACM |
731 | |
732 | size = sk->sk_prot->max_header + len; | |
733 | release_sock(sk); | |
734 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
735 | lock_sock(sk); | |
7c657876 ACM |
736 | if (skb == NULL) |
737 | goto out_release; | |
738 | ||
739 | skb_reserve(skb, sk->sk_prot->max_header); | |
740 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
741 | if (rc != 0) |
742 | goto out_discard; | |
743 | ||
97e5848d IM |
744 | skb_queue_tail(&sk->sk_write_queue, skb); |
745 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
746 | out_release: |
747 | release_sock(sk); | |
748 | return rc ? : len; | |
27258ee5 ACM |
749 | out_discard: |
750 | kfree_skb(skb); | |
7c657876 | 751 | goto out_release; |
7c657876 ACM |
752 | } |
753 | ||
f21e68ca ACM |
754 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
755 | ||
7c657876 ACM |
756 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
757 | size_t len, int nonblock, int flags, int *addr_len) | |
758 | { | |
759 | const struct dccp_hdr *dh; | |
7c657876 ACM |
760 | long timeo; |
761 | ||
762 | lock_sock(sk); | |
763 | ||
531669a0 ACM |
764 | if (sk->sk_state == DCCP_LISTEN) { |
765 | len = -ENOTCONN; | |
7c657876 | 766 | goto out; |
7c657876 | 767 | } |
7c657876 | 768 | |
531669a0 | 769 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
770 | |
771 | do { | |
531669a0 | 772 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 773 | |
531669a0 ACM |
774 | if (skb == NULL) |
775 | goto verify_sock_status; | |
7c657876 | 776 | |
531669a0 | 777 | dh = dccp_hdr(skb); |
7c657876 | 778 | |
0c869620 GR |
779 | switch (dh->dccph_type) { |
780 | case DCCP_PKT_DATA: | |
781 | case DCCP_PKT_DATAACK: | |
531669a0 | 782 | goto found_ok_skb; |
7c657876 | 783 | |
0c869620 GR |
784 | case DCCP_PKT_CLOSE: |
785 | case DCCP_PKT_CLOSEREQ: | |
786 | if (!(flags & MSG_PEEK)) | |
787 | dccp_finish_passive_close(sk); | |
788 | /* fall through */ | |
789 | case DCCP_PKT_RESET: | |
790 | dccp_pr_debug("found fin (%s) ok!\n", | |
791 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
792 | len = 0; |
793 | goto found_fin_ok; | |
0c869620 GR |
794 | default: |
795 | dccp_pr_debug("packet_type=%s\n", | |
796 | dccp_packet_name(dh->dccph_type)); | |
797 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 798 | } |
531669a0 ACM |
799 | verify_sock_status: |
800 | if (sock_flag(sk, SOCK_DONE)) { | |
801 | len = 0; | |
7c657876 | 802 | break; |
531669a0 | 803 | } |
7c657876 | 804 | |
531669a0 ACM |
805 | if (sk->sk_err) { |
806 | len = sock_error(sk); | |
807 | break; | |
808 | } | |
7c657876 | 809 | |
531669a0 ACM |
810 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
811 | len = 0; | |
812 | break; | |
813 | } | |
7c657876 | 814 | |
531669a0 ACM |
815 | if (sk->sk_state == DCCP_CLOSED) { |
816 | if (!sock_flag(sk, SOCK_DONE)) { | |
817 | /* This occurs when user tries to read | |
818 | * from never connected socket. | |
819 | */ | |
820 | len = -ENOTCONN; | |
7c657876 ACM |
821 | break; |
822 | } | |
531669a0 ACM |
823 | len = 0; |
824 | break; | |
7c657876 ACM |
825 | } |
826 | ||
531669a0 ACM |
827 | if (!timeo) { |
828 | len = -EAGAIN; | |
829 | break; | |
830 | } | |
7c657876 | 831 | |
531669a0 ACM |
832 | if (signal_pending(current)) { |
833 | len = sock_intr_errno(timeo); | |
834 | break; | |
835 | } | |
7c657876 | 836 | |
531669a0 | 837 | sk_wait_data(sk, &timeo); |
7c657876 | 838 | continue; |
7c657876 | 839 | found_ok_skb: |
531669a0 ACM |
840 | if (len > skb->len) |
841 | len = skb->len; | |
842 | else if (len < skb->len) | |
843 | msg->msg_flags |= MSG_TRUNC; | |
844 | ||
845 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
846 | /* Exception. Bailout! */ | |
847 | len = -EFAULT; | |
848 | break; | |
7c657876 | 849 | } |
7c657876 ACM |
850 | found_fin_ok: |
851 | if (!(flags & MSG_PEEK)) | |
624d1164 | 852 | sk_eat_skb(sk, skb, 0); |
7c657876 | 853 | break; |
531669a0 | 854 | } while (1); |
7c657876 ACM |
855 | out: |
856 | release_sock(sk); | |
531669a0 | 857 | return len; |
7c657876 ACM |
858 | } |
859 | ||
f21e68ca ACM |
860 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
861 | ||
862 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
863 | { |
864 | struct sock *sk = sock->sk; | |
865 | unsigned char old_state; | |
866 | int err; | |
867 | ||
868 | lock_sock(sk); | |
869 | ||
870 | err = -EINVAL; | |
871 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
872 | goto out; | |
873 | ||
874 | old_state = sk->sk_state; | |
875 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
876 | goto out; | |
877 | ||
878 | /* Really, if the socket is already in listen state | |
879 | * we can only allow the backlog to be adjusted. | |
880 | */ | |
881 | if (old_state != DCCP_LISTEN) { | |
882 | /* | |
883 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
884 | * see tcp_listen_start | |
885 | */ | |
72a3effa | 886 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
887 | if (err) |
888 | goto out; | |
889 | } | |
890 | sk->sk_max_ack_backlog = backlog; | |
891 | err = 0; | |
892 | ||
893 | out: | |
894 | release_sock(sk); | |
895 | return err; | |
896 | } | |
897 | ||
f21e68ca ACM |
898 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
899 | ||
0c869620 | 900 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 901 | { |
0c869620 | 902 | u8 next_state = DCCP_CLOSED; |
7c657876 | 903 | |
0c869620 GR |
904 | switch (sk->sk_state) { |
905 | case DCCP_PASSIVE_CLOSE: | |
906 | case DCCP_PASSIVE_CLOSEREQ: | |
907 | dccp_finish_passive_close(sk); | |
908 | break; | |
909 | case DCCP_PARTOPEN: | |
910 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
911 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
912 | /* fall through */ | |
913 | case DCCP_OPEN: | |
914 | dccp_send_close(sk, 1); | |
7c657876 | 915 | |
b8599d20 GR |
916 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
917 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
918 | next_state = DCCP_ACTIVE_CLOSEREQ; |
919 | else | |
920 | next_state = DCCP_CLOSING; | |
921 | /* fall through */ | |
922 | default: | |
923 | dccp_set_state(sk, next_state); | |
924 | } | |
7c657876 ACM |
925 | } |
926 | ||
927 | void dccp_close(struct sock *sk, long timeout) | |
928 | { | |
97e5848d | 929 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 930 | struct sk_buff *skb; |
d83bd95b | 931 | u32 data_was_unread = 0; |
134af346 | 932 | int state; |
7c657876 ACM |
933 | |
934 | lock_sock(sk); | |
935 | ||
936 | sk->sk_shutdown = SHUTDOWN_MASK; | |
937 | ||
938 | if (sk->sk_state == DCCP_LISTEN) { | |
939 | dccp_set_state(sk, DCCP_CLOSED); | |
940 | ||
941 | /* Special case. */ | |
942 | inet_csk_listen_stop(sk); | |
943 | ||
944 | goto adjudge_to_death; | |
945 | } | |
946 | ||
97e5848d IM |
947 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
948 | ||
7c657876 ACM |
949 | /* |
950 | * We need to flush the recv. buffs. We do this only on the | |
951 | * descriptor close, not protocol-sourced closes, because the | |
952 | *reader process may not have drained the data yet! | |
953 | */ | |
7c657876 | 954 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 955 | data_was_unread += skb->len; |
7c657876 ACM |
956 | __kfree_skb(skb); |
957 | } | |
958 | ||
d83bd95b GR |
959 | if (data_was_unread) { |
960 | /* Unread data was tossed, send an appropriate Reset Code */ | |
961 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
962 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
963 | dccp_set_state(sk, DCCP_CLOSED); | |
964 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
965 | /* Check zero linger _after_ checking for unread data. */ |
966 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
967 | } else if (sk->sk_state != DCCP_CLOSED) { |
968 | dccp_terminate_connection(sk); | |
7c657876 ACM |
969 | } |
970 | ||
971 | sk_stream_wait_close(sk, timeout); | |
972 | ||
973 | adjudge_to_death: | |
134af346 HX |
974 | state = sk->sk_state; |
975 | sock_hold(sk); | |
976 | sock_orphan(sk); | |
977 | atomic_inc(sk->sk_prot->orphan_count); | |
978 | ||
7ad07e7c ACM |
979 | /* |
980 | * It is the last release_sock in its life. It will remove backlog. | |
981 | */ | |
7c657876 ACM |
982 | release_sock(sk); |
983 | /* | |
984 | * Now socket is owned by kernel and we acquire BH lock | |
985 | * to finish close. No need to check for user refs. | |
986 | */ | |
987 | local_bh_disable(); | |
988 | bh_lock_sock(sk); | |
547b792c | 989 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 990 | |
134af346 HX |
991 | /* Have we already been destroyed by a softirq or backlog? */ |
992 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
993 | goto out; | |
7ad07e7c | 994 | |
7c657876 ACM |
995 | if (sk->sk_state == DCCP_CLOSED) |
996 | inet_csk_destroy_sock(sk); | |
997 | ||
998 | /* Otherwise, socket is reprieved until protocol close. */ | |
999 | ||
134af346 | 1000 | out: |
7c657876 ACM |
1001 | bh_unlock_sock(sk); |
1002 | local_bh_enable(); | |
1003 | sock_put(sk); | |
1004 | } | |
1005 | ||
f21e68ca ACM |
1006 | EXPORT_SYMBOL_GPL(dccp_close); |
1007 | ||
7c657876 ACM |
1008 | void dccp_shutdown(struct sock *sk, int how) |
1009 | { | |
8e8c71f1 | 1010 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1011 | } |
1012 | ||
f21e68ca ACM |
1013 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1014 | ||
24e8b7e4 | 1015 | static inline int dccp_mib_init(void) |
7c657876 | 1016 | { |
24e8b7e4 | 1017 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
7c657876 ACM |
1018 | } |
1019 | ||
24e8b7e4 | 1020 | static inline void dccp_mib_exit(void) |
46f09ffa | 1021 | { |
24e8b7e4 | 1022 | snmp_mib_free((void**)dccp_statistics); |
46f09ffa ACM |
1023 | } |
1024 | ||
7c657876 ACM |
1025 | static int thash_entries; |
1026 | module_param(thash_entries, int, 0444); | |
1027 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1028 | ||
a1d3a355 | 1029 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1030 | int dccp_debug; |
042d18f9 | 1031 | module_param(dccp_debug, bool, 0444); |
7c657876 | 1032 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1033 | |
1034 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1035 | #endif |
7c657876 ACM |
1036 | |
1037 | static int __init dccp_init(void) | |
1038 | { | |
1039 | unsigned long goal; | |
1040 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1041 | int rc = -ENOBUFS; |
7c657876 | 1042 | |
028b0275 PM |
1043 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1044 | FIELD_SIZEOF(struct sk_buff, cb)); | |
1045 | ||
7690af3f ACM |
1046 | dccp_hashinfo.bind_bucket_cachep = |
1047 | kmem_cache_create("dccp_bind_bucket", | |
1048 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1049 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1050 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1051 | goto out; |
7c657876 ACM |
1052 | |
1053 | /* | |
1054 | * Size and allocate the main established and bind bucket | |
1055 | * hash tables. | |
1056 | * | |
1057 | * The methodology is similar to that of the buffer cache. | |
1058 | */ | |
1059 | if (num_physpages >= (128 * 1024)) | |
1060 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1061 | else | |
1062 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1063 | ||
1064 | if (thash_entries) | |
7690af3f ACM |
1065 | goal = (thash_entries * |
1066 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1067 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1068 | ; | |
1069 | do { | |
1070 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1071 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1072 | while (dccp_hashinfo.ehash_size & |
1073 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1074 | dccp_hashinfo.ehash_size--; |
1075 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1076 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1077 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1078 | ||
1079 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1080 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1081 | goto out_free_bind_bucket_cachep; |
1082 | } | |
1083 | ||
dbca9b27 | 1084 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1085 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1086 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1087 | } |
1088 | ||
230140cf ED |
1089 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1090 | goto out_free_dccp_ehash; | |
1091 | ||
7c657876 ACM |
1092 | bhash_order = ehash_order; |
1093 | ||
1094 | do { | |
1095 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1096 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1097 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1098 | bhash_order > 0) | |
7c657876 ACM |
1099 | continue; |
1100 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1101 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1102 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1103 | ||
1104 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1105 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1106 | goto out_free_dccp_locks; |
7c657876 ACM |
1107 | } |
1108 | ||
1109 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1110 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1111 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1112 | } | |
1113 | ||
46f09ffa | 1114 | rc = dccp_mib_init(); |
fa23e2ec | 1115 | if (rc) |
7c657876 ACM |
1116 | goto out_free_dccp_bhash; |
1117 | ||
9b07ef5d | 1118 | rc = dccp_ackvec_init(); |
7c657876 | 1119 | if (rc) |
b61fafc4 | 1120 | goto out_free_dccp_mib; |
9b07ef5d | 1121 | |
e55d912f | 1122 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1123 | if (rc) |
1124 | goto out_ackvec_exit; | |
4c70f383 GR |
1125 | |
1126 | dccp_timestamping_init(); | |
7c657876 ACM |
1127 | out: |
1128 | return rc; | |
9b07ef5d ACM |
1129 | out_ackvec_exit: |
1130 | dccp_ackvec_exit(); | |
b61fafc4 | 1131 | out_free_dccp_mib: |
46f09ffa | 1132 | dccp_mib_exit(); |
7c657876 ACM |
1133 | out_free_dccp_bhash: |
1134 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1135 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1136 | out_free_dccp_locks: |
1137 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1138 | out_free_dccp_ehash: |
1139 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1140 | dccp_hashinfo.ehash = NULL; | |
1141 | out_free_bind_bucket_cachep: | |
1142 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1143 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1144 | goto out; |
1145 | } | |
1146 | ||
7c657876 ACM |
1147 | static void __exit dccp_fini(void) |
1148 | { | |
46f09ffa | 1149 | dccp_mib_exit(); |
725ba8ee ACM |
1150 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1151 | get_order(dccp_hashinfo.bhash_size * | |
1152 | sizeof(struct inet_bind_hashbucket))); | |
1153 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1154 | get_order(dccp_hashinfo.ehash_size * | |
1155 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1156 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1157 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1158 | dccp_ackvec_exit(); |
e55d912f | 1159 | dccp_sysctl_exit(); |
7c657876 ACM |
1160 | } |
1161 | ||
1162 | module_init(dccp_init); | |
1163 | module_exit(dccp_fini); | |
1164 | ||
7c657876 ACM |
1165 | MODULE_LICENSE("GPL"); |
1166 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1167 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |