Commit | Line | Data |
---|---|---|
7c657876 ACM |
1 | /* |
2 | * net/dccp/proto.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
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 | ||
dd24c001 | 43 | struct percpu_counter dccp_orphan_count; |
f21e68ca ACM |
44 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
45 | ||
5caea4ea | 46 | struct inet_hashinfo dccp_hashinfo; |
075ae866 ACM |
47 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
48 | ||
b1308dc0 IM |
49 | /* the maximum queue length for tx in packets. 0 is no limit */ |
50 | int sysctl_dccp_tx_qlen __read_mostly = 5; | |
51 | ||
c25a18ba ACM |
52 | void dccp_set_state(struct sock *sk, const int state) |
53 | { | |
54 | const int oldstate = sk->sk_state; | |
55 | ||
f11135a3 | 56 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
c25a18ba ACM |
57 | dccp_state_name(oldstate), dccp_state_name(state)); |
58 | WARN_ON(state == oldstate); | |
59 | ||
60 | switch (state) { | |
61 | case DCCP_OPEN: | |
62 | if (oldstate != DCCP_OPEN) | |
63 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
64 | break; | |
65 | ||
66 | case DCCP_CLOSED: | |
0c869620 GR |
67 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
68 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
69 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
70 | ||
71 | sk->sk_prot->unhash(sk); | |
72 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
73 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 74 | inet_put_port(sk); |
c25a18ba ACM |
75 | /* fall through */ |
76 | default: | |
77 | if (oldstate == DCCP_OPEN) | |
78 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
79 | } | |
80 | ||
81 | /* Change state AFTER socket is unhashed to avoid closed | |
82 | * socket sitting in hash tables. | |
83 | */ | |
84 | sk->sk_state = state; | |
85 | } | |
86 | ||
87 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
88 | ||
0c869620 GR |
89 | static void dccp_finish_passive_close(struct sock *sk) |
90 | { | |
91 | switch (sk->sk_state) { | |
92 | case DCCP_PASSIVE_CLOSE: | |
93 | /* Node (client or server) has received Close packet. */ | |
94 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
95 | dccp_set_state(sk, DCCP_CLOSED); | |
96 | break; | |
97 | case DCCP_PASSIVE_CLOSEREQ: | |
98 | /* | |
99 | * Client received CloseReq. We set the `active' flag so that | |
100 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
101 | */ | |
102 | dccp_send_close(sk, 1); | |
103 | dccp_set_state(sk, DCCP_CLOSING); | |
104 | } | |
105 | } | |
106 | ||
c25a18ba ACM |
107 | void dccp_done(struct sock *sk) |
108 | { | |
109 | dccp_set_state(sk, DCCP_CLOSED); | |
110 | dccp_clear_xmit_timers(sk); | |
111 | ||
112 | sk->sk_shutdown = SHUTDOWN_MASK; | |
113 | ||
114 | if (!sock_flag(sk, SOCK_DEAD)) | |
115 | sk->sk_state_change(sk); | |
116 | else | |
117 | inet_csk_destroy_sock(sk); | |
118 | } | |
119 | ||
120 | EXPORT_SYMBOL_GPL(dccp_done); | |
121 | ||
7c657876 ACM |
122 | const char *dccp_packet_name(const int type) |
123 | { | |
124 | static const char *dccp_packet_names[] = { | |
125 | [DCCP_PKT_REQUEST] = "REQUEST", | |
126 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
127 | [DCCP_PKT_DATA] = "DATA", | |
128 | [DCCP_PKT_ACK] = "ACK", | |
129 | [DCCP_PKT_DATAACK] = "DATAACK", | |
130 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
131 | [DCCP_PKT_CLOSE] = "CLOSE", | |
132 | [DCCP_PKT_RESET] = "RESET", | |
133 | [DCCP_PKT_SYNC] = "SYNC", | |
134 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
135 | }; | |
136 | ||
137 | if (type >= DCCP_NR_PKT_TYPES) | |
138 | return "INVALID"; | |
139 | else | |
140 | return dccp_packet_names[type]; | |
141 | } | |
142 | ||
143 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
144 | ||
145 | const char *dccp_state_name(const int state) | |
146 | { | |
147 | static char *dccp_state_names[] = { | |
f11135a3 GR |
148 | [DCCP_OPEN] = "OPEN", |
149 | [DCCP_REQUESTING] = "REQUESTING", | |
150 | [DCCP_PARTOPEN] = "PARTOPEN", | |
151 | [DCCP_LISTEN] = "LISTEN", | |
152 | [DCCP_RESPOND] = "RESPOND", | |
153 | [DCCP_CLOSING] = "CLOSING", | |
154 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
155 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
156 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
157 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
158 | [DCCP_CLOSED] = "CLOSED", | |
7c657876 ACM |
159 | }; |
160 | ||
161 | if (state >= DCCP_MAX_STATES) | |
162 | return "INVALID STATE!"; | |
163 | else | |
164 | return dccp_state_names[state]; | |
165 | } | |
166 | ||
167 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
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); | |
410e27a4 | 172 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 | 173 | struct inet_connection_sock *icsk = inet_csk(sk); |
3e0fadc5 | 174 | |
410e27a4 GR |
175 | dccp_minisock_init(&dp->dccps_minisock); |
176 | ||
e18d7a98 ACM |
177 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
178 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
179 | sk->sk_state = DCCP_CLOSED; | |
180 | sk->sk_write_space = dccp_write_space; | |
181 | icsk->icsk_sync_mss = dccp_sync_mss; | |
410e27a4 | 182 | dp->dccps_mss_cache = 536; |
e18d7a98 ACM |
183 | dp->dccps_rate_last = jiffies; |
184 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
185 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
410e27a4 | 186 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
e18d7a98 ACM |
187 | |
188 | dccp_init_xmit_timers(sk); | |
189 | ||
ac75773c | 190 | INIT_LIST_HEAD(&dp->dccps_featneg); |
410e27a4 GR |
191 | /* |
192 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
193 | * the listening (master) sock get CCID control blocks, which is not | |
194 | * necessary, but for now, to not mess with the test userspace apps, | |
195 | * lets leave it here, later the real solution is to do this in a | |
196 | * setsockopt(CCIDs-I-want/accept). -acme | |
197 | */ | |
198 | if (likely(ctl_sock_initialized)) { | |
e8ef967a | 199 | int rc = dccp_feat_init(sk); |
410e27a4 GR |
200 | |
201 | if (rc) | |
202 | return rc; | |
203 | ||
204 | if (dmsk->dccpms_send_ack_vector) { | |
205 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); | |
206 | if (dp->dccps_hc_rx_ackvec == NULL) | |
207 | return -ENOMEM; | |
208 | } | |
209 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, | |
210 | sk, GFP_KERNEL); | |
211 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
212 | sk, GFP_KERNEL); | |
213 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || | |
214 | dp->dccps_hc_tx_ccid == NULL)) { | |
215 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
216 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
217 | if (dmsk->dccpms_send_ack_vector) { | |
218 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); | |
219 | dp->dccps_hc_rx_ackvec = NULL; | |
220 | } | |
221 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
222 | return -ENOMEM; | |
223 | } | |
224 | } else { | |
225 | /* control socket doesn't need feat nego */ | |
226 | INIT_LIST_HEAD(&dmsk->dccpms_pending); | |
227 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
228 | } | |
229 | ||
3e0fadc5 ACM |
230 | return 0; |
231 | } | |
232 | ||
233 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
234 | ||
7d06b2e0 | 235 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
236 | { |
237 | struct dccp_sock *dp = dccp_sk(sk); | |
410e27a4 | 238 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
239 | |
240 | /* | |
241 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
242 | * for retransmissions | |
243 | */ | |
244 | if (sk->sk_send_head != NULL) { | |
245 | kfree_skb(sk->sk_send_head); | |
246 | sk->sk_send_head = NULL; | |
247 | } | |
248 | ||
249 | /* Clean up a referenced DCCP bind bucket. */ | |
250 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 251 | inet_put_port(sk); |
3e0fadc5 ACM |
252 | |
253 | kfree(dp->dccps_service_list); | |
254 | dp->dccps_service_list = NULL; | |
255 | ||
410e27a4 | 256 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
257 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
258 | dp->dccps_hc_rx_ackvec = NULL; | |
259 | } | |
260 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
261 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
262 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
263 | ||
264 | /* clean up feature negotiation state */ | |
d99a7bd2 | 265 | dccp_feat_list_purge(&dp->dccps_featneg); |
3e0fadc5 ACM |
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; | |
9eca0a47 GR |
275 | /* do not start to listen if feature negotiation setup fails */ |
276 | if (dccp_feat_finalise_settings(dp)) | |
277 | return -EPROTO; | |
72a3effa | 278 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
279 | } |
280 | ||
ce865a61 GR |
281 | static inline int dccp_need_reset(int state) |
282 | { | |
283 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
284 | state != DCCP_REQUESTING; | |
285 | } | |
286 | ||
7c657876 ACM |
287 | int dccp_disconnect(struct sock *sk, int flags) |
288 | { | |
289 | struct inet_connection_sock *icsk = inet_csk(sk); | |
290 | struct inet_sock *inet = inet_sk(sk); | |
291 | int err = 0; | |
292 | const int old_state = sk->sk_state; | |
293 | ||
294 | if (old_state != DCCP_CLOSED) | |
295 | dccp_set_state(sk, DCCP_CLOSED); | |
296 | ||
ce865a61 GR |
297 | /* |
298 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
299 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
300 | */ | |
7c657876 ACM |
301 | if (old_state == DCCP_LISTEN) { |
302 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
303 | } else if (dccp_need_reset(old_state)) { |
304 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
305 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
306 | } else if (old_state == DCCP_REQUESTING) |
307 | sk->sk_err = ECONNRESET; | |
308 | ||
309 | dccp_clear_xmit_timers(sk); | |
48816322 | 310 | |
7c657876 | 311 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 312 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
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 | ||
29450559 GR |
467 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
468 | { | |
469 | u8 *list, len; | |
470 | int i, rc; | |
471 | ||
472 | if (cscov < 0 || cscov > 15) | |
473 | return -EINVAL; | |
474 | /* | |
475 | * Populate a list of permissible values, in the range cscov...15. This | |
476 | * is necessary since feature negotiation of single values only works if | |
477 | * both sides incidentally choose the same value. Since the list starts | |
478 | * lowest-value first, negotiation will pick the smallest shared value. | |
479 | */ | |
480 | if (cscov == 0) | |
481 | return 0; | |
482 | len = 16 - cscov; | |
483 | ||
484 | list = kmalloc(len, GFP_KERNEL); | |
485 | if (list == NULL) | |
486 | return -ENOBUFS; | |
487 | ||
488 | for (i = 0; i < len; i++) | |
489 | list[i] = cscov++; | |
490 | ||
491 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); | |
492 | ||
493 | if (rc == 0) { | |
494 | if (rx) | |
495 | dccp_sk(sk)->dccps_pcrlen = cscov; | |
496 | else | |
497 | dccp_sk(sk)->dccps_pcslen = cscov; | |
498 | } | |
499 | kfree(list); | |
500 | return rc; | |
501 | } | |
502 | ||
b20a9c24 GR |
503 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
504 | char __user *optval, int optlen) | |
505 | { | |
506 | u8 *val; | |
507 | int rc = 0; | |
508 | ||
509 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) | |
510 | return -EINVAL; | |
511 | ||
512 | val = kmalloc(optlen, GFP_KERNEL); | |
513 | if (val == NULL) | |
514 | return -ENOMEM; | |
515 | ||
516 | if (copy_from_user(val, optval, optlen)) { | |
517 | kfree(val); | |
518 | return -EFAULT; | |
519 | } | |
520 | ||
521 | lock_sock(sk); | |
522 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) | |
523 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); | |
524 | ||
525 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) | |
526 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); | |
527 | release_sock(sk); | |
528 | ||
529 | kfree(val); | |
530 | return rc; | |
531 | } | |
532 | ||
3fdadf7d DM |
533 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
534 | char __user *optval, int optlen) | |
7c657876 | 535 | { |
09dbc389 GR |
536 | struct dccp_sock *dp = dccp_sk(sk); |
537 | int val, err = 0; | |
7c657876 | 538 | |
19102996 GR |
539 | switch (optname) { |
540 | case DCCP_SOCKOPT_PACKET_SIZE: | |
541 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
542 | return 0; | |
543 | case DCCP_SOCKOPT_CHANGE_L: | |
544 | case DCCP_SOCKOPT_CHANGE_R: | |
545 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); | |
546 | return 0; | |
b20a9c24 GR |
547 | case DCCP_SOCKOPT_CCID: |
548 | case DCCP_SOCKOPT_RX_CCID: | |
549 | case DCCP_SOCKOPT_TX_CCID: | |
550 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); | |
19102996 GR |
551 | } |
552 | ||
553 | if (optlen < (int)sizeof(int)) | |
a84ffe43 ACM |
554 | return -EINVAL; |
555 | ||
556 | if (get_user(val, (int __user *)optval)) | |
557 | return -EFAULT; | |
558 | ||
67e6b629 ACM |
559 | if (optname == DCCP_SOCKOPT_SERVICE) |
560 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 561 | |
67e6b629 | 562 | lock_sock(sk); |
a84ffe43 | 563 | switch (optname) { |
b8599d20 GR |
564 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
565 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
566 | err = -EOPNOTSUPP; | |
567 | else | |
568 | dp->dccps_server_timewait = (val != 0); | |
569 | break; | |
29450559 GR |
570 | case DCCP_SOCKOPT_SEND_CSCOV: |
571 | err = dccp_setsockopt_cscov(sk, val, false); | |
d6da3511 | 572 | break; |
29450559 GR |
573 | case DCCP_SOCKOPT_RECV_CSCOV: |
574 | err = dccp_setsockopt_cscov(sk, val, true); | |
d6da3511 | 575 | break; |
a84ffe43 ACM |
576 | default: |
577 | err = -ENOPROTOOPT; | |
578 | break; | |
579 | } | |
410e27a4 | 580 | release_sock(sk); |
19102996 | 581 | |
a84ffe43 | 582 | return err; |
7c657876 ACM |
583 | } |
584 | ||
3fdadf7d DM |
585 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
586 | char __user *optval, int optlen) | |
587 | { | |
588 | if (level != SOL_DCCP) | |
589 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
590 | optname, optval, | |
591 | optlen); | |
592 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
593 | } | |
543d9cfe | 594 | |
f21e68ca ACM |
595 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
596 | ||
3fdadf7d DM |
597 | #ifdef CONFIG_COMPAT |
598 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 599 | char __user *optval, int optlen) |
3fdadf7d | 600 | { |
dec73ff0 ACM |
601 | if (level != SOL_DCCP) |
602 | return inet_csk_compat_setsockopt(sk, level, optname, | |
603 | optval, optlen); | |
3fdadf7d DM |
604 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
605 | } | |
543d9cfe | 606 | |
3fdadf7d DM |
607 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
608 | #endif | |
609 | ||
67e6b629 | 610 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 611 | __be32 __user *optval, |
67e6b629 ACM |
612 | int __user *optlen) |
613 | { | |
614 | const struct dccp_sock *dp = dccp_sk(sk); | |
615 | const struct dccp_service_list *sl; | |
616 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
617 | ||
618 | lock_sock(sk); | |
67e6b629 ACM |
619 | if ((sl = dp->dccps_service_list) != NULL) { |
620 | slen = sl->dccpsl_nr * sizeof(u32); | |
621 | total_len += slen; | |
622 | } | |
623 | ||
624 | err = -EINVAL; | |
625 | if (total_len > len) | |
626 | goto out; | |
627 | ||
628 | err = 0; | |
629 | if (put_user(total_len, optlen) || | |
630 | put_user(dp->dccps_service, optval) || | |
631 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
632 | err = -EFAULT; | |
633 | out: | |
634 | release_sock(sk); | |
635 | return err; | |
636 | } | |
637 | ||
3fdadf7d | 638 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 639 | char __user *optval, int __user *optlen) |
7c657876 | 640 | { |
a84ffe43 ACM |
641 | struct dccp_sock *dp; |
642 | int val, len; | |
7c657876 | 643 | |
a84ffe43 ACM |
644 | if (get_user(len, optlen)) |
645 | return -EFAULT; | |
646 | ||
39ebc027 | 647 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
648 | return -EINVAL; |
649 | ||
650 | dp = dccp_sk(sk); | |
651 | ||
652 | switch (optname) { | |
653 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 654 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 655 | return 0; |
88f964db ACM |
656 | case DCCP_SOCKOPT_SERVICE: |
657 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 658 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
659 | case DCCP_SOCKOPT_GET_CUR_MPS: |
660 | val = dp->dccps_mss_cache; | |
7c559a9e | 661 | break; |
d90ebcbf GR |
662 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
663 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); | |
71c262a3 GR |
664 | case DCCP_SOCKOPT_TX_CCID: |
665 | val = ccid_get_current_tx_ccid(dp); | |
666 | if (val < 0) | |
667 | return -ENOPROTOOPT; | |
668 | break; | |
669 | case DCCP_SOCKOPT_RX_CCID: | |
670 | val = ccid_get_current_rx_ccid(dp); | |
671 | if (val < 0) | |
672 | return -ENOPROTOOPT; | |
673 | break; | |
b8599d20 GR |
674 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
675 | val = dp->dccps_server_timewait; | |
b8599d20 | 676 | break; |
6f4e5fff GR |
677 | case DCCP_SOCKOPT_SEND_CSCOV: |
678 | val = dp->dccps_pcslen; | |
679 | break; | |
680 | case DCCP_SOCKOPT_RECV_CSCOV: | |
681 | val = dp->dccps_pcrlen; | |
682 | break; | |
88f964db ACM |
683 | case 128 ... 191: |
684 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
685 | len, (u32 __user *)optval, optlen); | |
686 | case 192 ... 255: | |
687 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
688 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
689 | default: |
690 | return -ENOPROTOOPT; | |
691 | } | |
692 | ||
79133506 | 693 | len = sizeof(val); |
a84ffe43 ACM |
694 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
695 | return -EFAULT; | |
696 | ||
697 | return 0; | |
7c657876 ACM |
698 | } |
699 | ||
3fdadf7d DM |
700 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
701 | char __user *optval, int __user *optlen) | |
702 | { | |
703 | if (level != SOL_DCCP) | |
704 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
705 | optname, optval, | |
706 | optlen); | |
707 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
708 | } | |
543d9cfe | 709 | |
f21e68ca ACM |
710 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
711 | ||
3fdadf7d DM |
712 | #ifdef CONFIG_COMPAT |
713 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 714 | char __user *optval, int __user *optlen) |
3fdadf7d | 715 | { |
dec73ff0 ACM |
716 | if (level != SOL_DCCP) |
717 | return inet_csk_compat_getsockopt(sk, level, optname, | |
718 | optval, optlen); | |
3fdadf7d DM |
719 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
720 | } | |
543d9cfe | 721 | |
3fdadf7d DM |
722 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
723 | #endif | |
724 | ||
7c657876 ACM |
725 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
726 | size_t len) | |
727 | { | |
728 | const struct dccp_sock *dp = dccp_sk(sk); | |
729 | const int flags = msg->msg_flags; | |
730 | const int noblock = flags & MSG_DONTWAIT; | |
731 | struct sk_buff *skb; | |
732 | int rc, size; | |
733 | long timeo; | |
734 | ||
735 | if (len > dp->dccps_mss_cache) | |
736 | return -EMSGSIZE; | |
737 | ||
738 | lock_sock(sk); | |
b1308dc0 | 739 | |
410e27a4 GR |
740 | if (sysctl_dccp_tx_qlen && |
741 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
b1308dc0 IM |
742 | rc = -EAGAIN; |
743 | goto out_release; | |
744 | } | |
745 | ||
27258ee5 | 746 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
747 | |
748 | /* | |
749 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
750 | * so that the trick in dccp_rcv_request_sent_state_process. | |
751 | */ | |
752 | /* Wait for a connection to finish. */ | |
cecd8d0e | 753 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 754 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 755 | goto out_release; |
7c657876 ACM |
756 | |
757 | size = sk->sk_prot->max_header + len; | |
758 | release_sock(sk); | |
759 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
760 | lock_sock(sk); | |
7c657876 ACM |
761 | if (skb == NULL) |
762 | goto out_release; | |
763 | ||
764 | skb_reserve(skb, sk->sk_prot->max_header); | |
765 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
766 | if (rc != 0) |
767 | goto out_discard; | |
768 | ||
410e27a4 GR |
769 | skb_queue_tail(&sk->sk_write_queue, skb); |
770 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
771 | out_release: |
772 | release_sock(sk); | |
773 | return rc ? : len; | |
27258ee5 ACM |
774 | out_discard: |
775 | kfree_skb(skb); | |
7c657876 | 776 | goto out_release; |
7c657876 ACM |
777 | } |
778 | ||
f21e68ca ACM |
779 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
780 | ||
7c657876 ACM |
781 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
782 | size_t len, int nonblock, int flags, int *addr_len) | |
783 | { | |
784 | const struct dccp_hdr *dh; | |
7c657876 ACM |
785 | long timeo; |
786 | ||
787 | lock_sock(sk); | |
788 | ||
531669a0 ACM |
789 | if (sk->sk_state == DCCP_LISTEN) { |
790 | len = -ENOTCONN; | |
7c657876 | 791 | goto out; |
7c657876 | 792 | } |
7c657876 | 793 | |
531669a0 | 794 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
795 | |
796 | do { | |
531669a0 | 797 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 798 | |
531669a0 ACM |
799 | if (skb == NULL) |
800 | goto verify_sock_status; | |
7c657876 | 801 | |
531669a0 | 802 | dh = dccp_hdr(skb); |
7c657876 | 803 | |
0c869620 GR |
804 | switch (dh->dccph_type) { |
805 | case DCCP_PKT_DATA: | |
806 | case DCCP_PKT_DATAACK: | |
531669a0 | 807 | goto found_ok_skb; |
7c657876 | 808 | |
0c869620 GR |
809 | case DCCP_PKT_CLOSE: |
810 | case DCCP_PKT_CLOSEREQ: | |
811 | if (!(flags & MSG_PEEK)) | |
812 | dccp_finish_passive_close(sk); | |
813 | /* fall through */ | |
814 | case DCCP_PKT_RESET: | |
815 | dccp_pr_debug("found fin (%s) ok!\n", | |
816 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
817 | len = 0; |
818 | goto found_fin_ok; | |
0c869620 GR |
819 | default: |
820 | dccp_pr_debug("packet_type=%s\n", | |
821 | dccp_packet_name(dh->dccph_type)); | |
822 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 823 | } |
531669a0 ACM |
824 | verify_sock_status: |
825 | if (sock_flag(sk, SOCK_DONE)) { | |
826 | len = 0; | |
7c657876 | 827 | break; |
531669a0 | 828 | } |
7c657876 | 829 | |
531669a0 ACM |
830 | if (sk->sk_err) { |
831 | len = sock_error(sk); | |
832 | break; | |
833 | } | |
7c657876 | 834 | |
531669a0 ACM |
835 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
836 | len = 0; | |
837 | break; | |
838 | } | |
7c657876 | 839 | |
531669a0 ACM |
840 | if (sk->sk_state == DCCP_CLOSED) { |
841 | if (!sock_flag(sk, SOCK_DONE)) { | |
842 | /* This occurs when user tries to read | |
843 | * from never connected socket. | |
844 | */ | |
845 | len = -ENOTCONN; | |
7c657876 ACM |
846 | break; |
847 | } | |
531669a0 ACM |
848 | len = 0; |
849 | break; | |
7c657876 ACM |
850 | } |
851 | ||
531669a0 ACM |
852 | if (!timeo) { |
853 | len = -EAGAIN; | |
854 | break; | |
855 | } | |
7c657876 | 856 | |
531669a0 ACM |
857 | if (signal_pending(current)) { |
858 | len = sock_intr_errno(timeo); | |
859 | break; | |
860 | } | |
7c657876 | 861 | |
531669a0 | 862 | sk_wait_data(sk, &timeo); |
7c657876 | 863 | continue; |
7c657876 | 864 | found_ok_skb: |
531669a0 ACM |
865 | if (len > skb->len) |
866 | len = skb->len; | |
867 | else if (len < skb->len) | |
868 | msg->msg_flags |= MSG_TRUNC; | |
869 | ||
870 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
871 | /* Exception. Bailout! */ | |
872 | len = -EFAULT; | |
873 | break; | |
7c657876 | 874 | } |
7c657876 ACM |
875 | found_fin_ok: |
876 | if (!(flags & MSG_PEEK)) | |
624d1164 | 877 | sk_eat_skb(sk, skb, 0); |
7c657876 | 878 | break; |
531669a0 | 879 | } while (1); |
7c657876 ACM |
880 | out: |
881 | release_sock(sk); | |
531669a0 | 882 | return len; |
7c657876 ACM |
883 | } |
884 | ||
f21e68ca ACM |
885 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
886 | ||
887 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
888 | { |
889 | struct sock *sk = sock->sk; | |
890 | unsigned char old_state; | |
891 | int err; | |
892 | ||
893 | lock_sock(sk); | |
894 | ||
895 | err = -EINVAL; | |
896 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
897 | goto out; | |
898 | ||
899 | old_state = sk->sk_state; | |
900 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
901 | goto out; | |
902 | ||
903 | /* Really, if the socket is already in listen state | |
904 | * we can only allow the backlog to be adjusted. | |
905 | */ | |
906 | if (old_state != DCCP_LISTEN) { | |
907 | /* | |
908 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
909 | * see tcp_listen_start | |
910 | */ | |
72a3effa | 911 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
912 | if (err) |
913 | goto out; | |
914 | } | |
915 | sk->sk_max_ack_backlog = backlog; | |
916 | err = 0; | |
917 | ||
918 | out: | |
919 | release_sock(sk); | |
920 | return err; | |
921 | } | |
922 | ||
f21e68ca ACM |
923 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
924 | ||
0c869620 | 925 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 926 | { |
0c869620 | 927 | u8 next_state = DCCP_CLOSED; |
7c657876 | 928 | |
0c869620 GR |
929 | switch (sk->sk_state) { |
930 | case DCCP_PASSIVE_CLOSE: | |
931 | case DCCP_PASSIVE_CLOSEREQ: | |
932 | dccp_finish_passive_close(sk); | |
933 | break; | |
934 | case DCCP_PARTOPEN: | |
935 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
936 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
937 | /* fall through */ | |
938 | case DCCP_OPEN: | |
939 | dccp_send_close(sk, 1); | |
7c657876 | 940 | |
b8599d20 GR |
941 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
942 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
943 | next_state = DCCP_ACTIVE_CLOSEREQ; |
944 | else | |
945 | next_state = DCCP_CLOSING; | |
946 | /* fall through */ | |
947 | default: | |
948 | dccp_set_state(sk, next_state); | |
949 | } | |
7c657876 ACM |
950 | } |
951 | ||
952 | void dccp_close(struct sock *sk, long timeout) | |
953 | { | |
97e5848d | 954 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 955 | struct sk_buff *skb; |
d83bd95b | 956 | u32 data_was_unread = 0; |
134af346 | 957 | int state; |
7c657876 ACM |
958 | |
959 | lock_sock(sk); | |
960 | ||
961 | sk->sk_shutdown = SHUTDOWN_MASK; | |
962 | ||
963 | if (sk->sk_state == DCCP_LISTEN) { | |
964 | dccp_set_state(sk, DCCP_CLOSED); | |
965 | ||
966 | /* Special case. */ | |
967 | inet_csk_listen_stop(sk); | |
968 | ||
969 | goto adjudge_to_death; | |
970 | } | |
971 | ||
97e5848d IM |
972 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
973 | ||
7c657876 ACM |
974 | /* |
975 | * We need to flush the recv. buffs. We do this only on the | |
976 | * descriptor close, not protocol-sourced closes, because the | |
977 | *reader process may not have drained the data yet! | |
978 | */ | |
7c657876 | 979 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 980 | data_was_unread += skb->len; |
7c657876 ACM |
981 | __kfree_skb(skb); |
982 | } | |
983 | ||
d83bd95b GR |
984 | if (data_was_unread) { |
985 | /* Unread data was tossed, send an appropriate Reset Code */ | |
986 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
987 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
988 | dccp_set_state(sk, DCCP_CLOSED); | |
989 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
990 | /* Check zero linger _after_ checking for unread data. */ |
991 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
992 | } else if (sk->sk_state != DCCP_CLOSED) { |
993 | dccp_terminate_connection(sk); | |
7c657876 ACM |
994 | } |
995 | ||
996 | sk_stream_wait_close(sk, timeout); | |
997 | ||
998 | adjudge_to_death: | |
134af346 HX |
999 | state = sk->sk_state; |
1000 | sock_hold(sk); | |
1001 | sock_orphan(sk); | |
dd24c001 | 1002 | percpu_counter_inc(sk->sk_prot->orphan_count); |
134af346 | 1003 | |
7ad07e7c ACM |
1004 | /* |
1005 | * It is the last release_sock in its life. It will remove backlog. | |
1006 | */ | |
7c657876 ACM |
1007 | release_sock(sk); |
1008 | /* | |
1009 | * Now socket is owned by kernel and we acquire BH lock | |
1010 | * to finish close. No need to check for user refs. | |
1011 | */ | |
1012 | local_bh_disable(); | |
1013 | bh_lock_sock(sk); | |
547b792c | 1014 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 1015 | |
134af346 HX |
1016 | /* Have we already been destroyed by a softirq or backlog? */ |
1017 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
1018 | goto out; | |
7ad07e7c | 1019 | |
7c657876 ACM |
1020 | if (sk->sk_state == DCCP_CLOSED) |
1021 | inet_csk_destroy_sock(sk); | |
1022 | ||
1023 | /* Otherwise, socket is reprieved until protocol close. */ | |
1024 | ||
134af346 | 1025 | out: |
7c657876 ACM |
1026 | bh_unlock_sock(sk); |
1027 | local_bh_enable(); | |
1028 | sock_put(sk); | |
1029 | } | |
1030 | ||
f21e68ca ACM |
1031 | EXPORT_SYMBOL_GPL(dccp_close); |
1032 | ||
7c657876 ACM |
1033 | void dccp_shutdown(struct sock *sk, int how) |
1034 | { | |
8e8c71f1 | 1035 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1036 | } |
1037 | ||
f21e68ca ACM |
1038 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1039 | ||
24e8b7e4 | 1040 | static inline int dccp_mib_init(void) |
7c657876 | 1041 | { |
24e8b7e4 | 1042 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
7c657876 ACM |
1043 | } |
1044 | ||
24e8b7e4 | 1045 | static inline void dccp_mib_exit(void) |
46f09ffa | 1046 | { |
24e8b7e4 | 1047 | snmp_mib_free((void**)dccp_statistics); |
46f09ffa ACM |
1048 | } |
1049 | ||
7c657876 ACM |
1050 | static int thash_entries; |
1051 | module_param(thash_entries, int, 0444); | |
1052 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1053 | ||
a1d3a355 | 1054 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1055 | int dccp_debug; |
43264991 | 1056 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1057 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1058 | |
1059 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1060 | #endif |
7c657876 ACM |
1061 | |
1062 | static int __init dccp_init(void) | |
1063 | { | |
1064 | unsigned long goal; | |
1065 | int ehash_order, bhash_order, i; | |
dd24c001 | 1066 | int rc; |
7c657876 | 1067 | |
028b0275 PM |
1068 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1069 | FIELD_SIZEOF(struct sk_buff, cb)); | |
dd24c001 ED |
1070 | rc = percpu_counter_init(&dccp_orphan_count, 0); |
1071 | if (rc) | |
1072 | goto out; | |
1073 | rc = -ENOBUFS; | |
5caea4ea | 1074 | inet_hashinfo_init(&dccp_hashinfo); |
7690af3f ACM |
1075 | dccp_hashinfo.bind_bucket_cachep = |
1076 | kmem_cache_create("dccp_bind_bucket", | |
1077 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1078 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1079 | if (!dccp_hashinfo.bind_bucket_cachep) |
dd24c001 | 1080 | goto out_free_percpu; |
7c657876 ACM |
1081 | |
1082 | /* | |
1083 | * Size and allocate the main established and bind bucket | |
1084 | * hash tables. | |
1085 | * | |
1086 | * The methodology is similar to that of the buffer cache. | |
1087 | */ | |
1088 | if (num_physpages >= (128 * 1024)) | |
1089 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1090 | else | |
1091 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1092 | ||
1093 | if (thash_entries) | |
7690af3f ACM |
1094 | goal = (thash_entries * |
1095 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1096 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1097 | ; | |
1098 | do { | |
1099 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1100 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1101 | while (dccp_hashinfo.ehash_size & |
1102 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1103 | dccp_hashinfo.ehash_size--; |
1104 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1105 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1106 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1107 | ||
1108 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1109 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1110 | goto out_free_bind_bucket_cachep; |
1111 | } | |
1112 | ||
dbca9b27 | 1113 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
3ab5aee7 ED |
1114 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); |
1115 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i); | |
7c657876 ACM |
1116 | } |
1117 | ||
230140cf ED |
1118 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1119 | goto out_free_dccp_ehash; | |
1120 | ||
7c657876 ACM |
1121 | bhash_order = ehash_order; |
1122 | ||
1123 | do { | |
1124 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1125 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1126 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1127 | bhash_order > 0) | |
7c657876 ACM |
1128 | continue; |
1129 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1130 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1131 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1132 | ||
1133 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1134 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1135 | goto out_free_dccp_locks; |
7c657876 ACM |
1136 | } |
1137 | ||
1138 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1139 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1140 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1141 | } | |
1142 | ||
46f09ffa | 1143 | rc = dccp_mib_init(); |
fa23e2ec | 1144 | if (rc) |
7c657876 ACM |
1145 | goto out_free_dccp_bhash; |
1146 | ||
9b07ef5d | 1147 | rc = dccp_ackvec_init(); |
7c657876 | 1148 | if (rc) |
b61fafc4 | 1149 | goto out_free_dccp_mib; |
9b07ef5d | 1150 | |
e55d912f | 1151 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1152 | if (rc) |
1153 | goto out_ackvec_exit; | |
4c70f383 GR |
1154 | |
1155 | dccp_timestamping_init(); | |
7c657876 ACM |
1156 | out: |
1157 | return rc; | |
9b07ef5d ACM |
1158 | out_ackvec_exit: |
1159 | dccp_ackvec_exit(); | |
b61fafc4 | 1160 | out_free_dccp_mib: |
46f09ffa | 1161 | dccp_mib_exit(); |
7c657876 ACM |
1162 | out_free_dccp_bhash: |
1163 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1164 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1165 | out_free_dccp_locks: |
1166 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1167 | out_free_dccp_ehash: |
1168 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1169 | dccp_hashinfo.ehash = NULL; | |
1170 | out_free_bind_bucket_cachep: | |
1171 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1172 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
dd24c001 ED |
1173 | out_free_percpu: |
1174 | percpu_counter_destroy(&dccp_orphan_count); | |
7c657876 ACM |
1175 | goto out; |
1176 | } | |
1177 | ||
7c657876 ACM |
1178 | static void __exit dccp_fini(void) |
1179 | { | |
46f09ffa | 1180 | dccp_mib_exit(); |
725ba8ee ACM |
1181 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1182 | get_order(dccp_hashinfo.bhash_size * | |
1183 | sizeof(struct inet_bind_hashbucket))); | |
1184 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1185 | get_order(dccp_hashinfo.ehash_size * | |
1186 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1187 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1188 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1189 | dccp_ackvec_exit(); |
e55d912f | 1190 | dccp_sysctl_exit(); |
7c657876 ACM |
1191 | } |
1192 | ||
1193 | module_init(dccp_init); | |
1194 | module_exit(dccp_fini); | |
1195 | ||
7c657876 ACM |
1196 | MODULE_LICENSE("GPL"); |
1197 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1198 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |