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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 | ||
828755ce | 196 | INIT_LIST_HEAD(&dp->dccps_featneg); |
3e0fadc5 ACM |
197 | /* |
198 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
199 | * the listening (master) sock get CCID control blocks, which is not | |
200 | * necessary, but for now, to not mess with the test userspace apps, | |
201 | * lets leave it here, later the real solution is to do this in a | |
202 | * setsockopt(CCIDs-I-want/accept). -acme | |
203 | */ | |
72478873 | 204 | if (likely(ctl_sock_initialized)) { |
86349c8d | 205 | int rc = dccp_feat_init(sk); |
3e0fadc5 ACM |
206 | |
207 | if (rc) | |
208 | return rc; | |
209 | ||
a4bf3902 | 210 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
211 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
212 | if (dp->dccps_hc_rx_ackvec == NULL) | |
213 | return -ENOMEM; | |
214 | } | |
a4bf3902 ACM |
215 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
216 | sk, GFP_KERNEL); | |
217 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
218 | sk, GFP_KERNEL); | |
8109b02b | 219 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
3e0fadc5 ACM |
220 | dp->dccps_hc_tx_ccid == NULL)) { |
221 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
222 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
a4bf3902 | 223 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
224 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
225 | dp->dccps_hc_rx_ackvec = NULL; | |
226 | } | |
227 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
228 | return -ENOMEM; | |
229 | } | |
230 | } else { | |
231 | /* control socket doesn't need feat nego */ | |
a4bf3902 ACM |
232 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
233 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
3e0fadc5 ACM |
234 | } |
235 | ||
3e0fadc5 ACM |
236 | return 0; |
237 | } | |
238 | ||
239 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
240 | ||
7d06b2e0 | 241 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
242 | { |
243 | struct dccp_sock *dp = dccp_sk(sk); | |
8ca0d17b | 244 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
245 | |
246 | /* | |
247 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
248 | * for retransmissions | |
249 | */ | |
250 | if (sk->sk_send_head != NULL) { | |
251 | kfree_skb(sk->sk_send_head); | |
252 | sk->sk_send_head = NULL; | |
253 | } | |
254 | ||
255 | /* Clean up a referenced DCCP bind bucket. */ | |
256 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 257 | inet_put_port(sk); |
3e0fadc5 ACM |
258 | |
259 | kfree(dp->dccps_service_list); | |
260 | dp->dccps_service_list = NULL; | |
261 | ||
8ca0d17b | 262 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
263 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
264 | dp->dccps_hc_rx_ackvec = NULL; | |
265 | } | |
266 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
267 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
268 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
269 | ||
270 | /* clean up feature negotiation state */ | |
70208383 | 271 | dccp_feat_list_purge(&dp->dccps_featneg); |
3e0fadc5 ACM |
272 | } |
273 | ||
274 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
275 | ||
72a3effa | 276 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 277 | { |
67e6b629 ACM |
278 | struct dccp_sock *dp = dccp_sk(sk); |
279 | ||
280 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
093e1f46 GR |
281 | /* do not start to listen if feature negotiation setup fails */ |
282 | if (dccp_feat_finalise_settings(dp)) | |
283 | return -EPROTO; | |
72a3effa | 284 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
285 | } |
286 | ||
ce865a61 GR |
287 | static inline int dccp_need_reset(int state) |
288 | { | |
289 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
290 | state != DCCP_REQUESTING; | |
291 | } | |
292 | ||
7c657876 ACM |
293 | int dccp_disconnect(struct sock *sk, int flags) |
294 | { | |
295 | struct inet_connection_sock *icsk = inet_csk(sk); | |
296 | struct inet_sock *inet = inet_sk(sk); | |
297 | int err = 0; | |
298 | const int old_state = sk->sk_state; | |
299 | ||
300 | if (old_state != DCCP_CLOSED) | |
301 | dccp_set_state(sk, DCCP_CLOSED); | |
302 | ||
ce865a61 GR |
303 | /* |
304 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
305 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
306 | */ | |
7c657876 ACM |
307 | if (old_state == DCCP_LISTEN) { |
308 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
309 | } else if (dccp_need_reset(old_state)) { |
310 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
311 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
312 | } else if (old_state == DCCP_REQUESTING) |
313 | sk->sk_err = ECONNRESET; | |
314 | ||
315 | dccp_clear_xmit_timers(sk); | |
48816322 | 316 | |
7c657876 | 317 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 318 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
319 | if (sk->sk_send_head != NULL) { |
320 | __kfree_skb(sk->sk_send_head); | |
321 | sk->sk_send_head = NULL; | |
322 | } | |
323 | ||
324 | inet->dport = 0; | |
325 | ||
326 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
327 | inet_reset_saddr(sk); | |
328 | ||
329 | sk->sk_shutdown = 0; | |
330 | sock_reset_flag(sk, SOCK_DONE); | |
331 | ||
332 | icsk->icsk_backoff = 0; | |
333 | inet_csk_delack_init(sk); | |
334 | __sk_dst_reset(sk); | |
335 | ||
547b792c | 336 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
7c657876 ACM |
337 | |
338 | sk->sk_error_report(sk); | |
339 | return err; | |
340 | } | |
341 | ||
f21e68ca ACM |
342 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
343 | ||
331968bd ACM |
344 | /* |
345 | * Wait for a DCCP event. | |
346 | * | |
347 | * Note that we don't need to lock the socket, as the upper poll layers | |
348 | * take care of normal races (between the test and the event) and we don't | |
349 | * go look at any of the socket buffers directly. | |
350 | */ | |
f21e68ca ACM |
351 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
352 | poll_table *wait) | |
331968bd ACM |
353 | { |
354 | unsigned int mask; | |
355 | struct sock *sk = sock->sk; | |
356 | ||
357 | poll_wait(file, sk->sk_sleep, wait); | |
358 | if (sk->sk_state == DCCP_LISTEN) | |
359 | return inet_csk_listen_poll(sk); | |
360 | ||
361 | /* Socket is not locked. We are protected from async events | |
362 | by poll logic and correct handling of state changes | |
363 | made by another threads is impossible in any case. | |
364 | */ | |
365 | ||
366 | mask = 0; | |
367 | if (sk->sk_err) | |
368 | mask = POLLERR; | |
369 | ||
370 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
371 | mask |= POLLHUP; | |
372 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 373 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
374 | |
375 | /* Connected? */ | |
376 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
377 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
378 | mask |= POLLIN | POLLRDNORM; | |
379 | ||
380 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
381 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
382 | mask |= POLLOUT | POLLWRNORM; | |
383 | } else { /* send SIGIO later */ | |
384 | set_bit(SOCK_ASYNC_NOSPACE, | |
385 | &sk->sk_socket->flags); | |
386 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
387 | ||
388 | /* Race breaker. If space is freed after | |
389 | * wspace test but before the flags are set, | |
390 | * IO signal will be lost. | |
391 | */ | |
392 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
393 | mask |= POLLOUT | POLLWRNORM; | |
394 | } | |
395 | } | |
396 | } | |
397 | return mask; | |
398 | } | |
399 | ||
f21e68ca ACM |
400 | EXPORT_SYMBOL_GPL(dccp_poll); |
401 | ||
7c657876 ACM |
402 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
403 | { | |
6273172e ACM |
404 | int rc = -ENOTCONN; |
405 | ||
406 | lock_sock(sk); | |
407 | ||
408 | if (sk->sk_state == DCCP_LISTEN) | |
409 | goto out; | |
410 | ||
411 | switch (cmd) { | |
412 | case SIOCINQ: { | |
413 | struct sk_buff *skb; | |
414 | unsigned long amount = 0; | |
415 | ||
416 | skb = skb_peek(&sk->sk_receive_queue); | |
417 | if (skb != NULL) { | |
418 | /* | |
419 | * We will only return the amount of this packet since | |
420 | * that is all that will be read. | |
421 | */ | |
422 | amount = skb->len; | |
423 | } | |
424 | rc = put_user(amount, (int __user *)arg); | |
425 | } | |
426 | break; | |
427 | default: | |
428 | rc = -ENOIOCTLCMD; | |
429 | break; | |
430 | } | |
431 | out: | |
432 | release_sock(sk); | |
433 | return rc; | |
7c657876 ACM |
434 | } |
435 | ||
f21e68ca ACM |
436 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
437 | ||
60fe62e7 | 438 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
439 | char __user *optval, int optlen) |
440 | { | |
441 | struct dccp_sock *dp = dccp_sk(sk); | |
442 | struct dccp_service_list *sl = NULL; | |
443 | ||
8109b02b | 444 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
445 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
446 | return -EINVAL; | |
447 | ||
448 | if (optlen > sizeof(service)) { | |
449 | sl = kmalloc(optlen, GFP_KERNEL); | |
450 | if (sl == NULL) | |
451 | return -ENOMEM; | |
452 | ||
453 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
454 | if (copy_from_user(sl->dccpsl_list, | |
455 | optval + sizeof(service), | |
456 | optlen - sizeof(service)) || | |
457 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
458 | kfree(sl); | |
459 | return -EFAULT; | |
460 | } | |
461 | } | |
462 | ||
463 | lock_sock(sk); | |
464 | dp->dccps_service = service; | |
465 | ||
a51482bd | 466 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
467 | |
468 | dp->dccps_service_list = sl; | |
469 | release_sock(sk); | |
470 | return 0; | |
471 | } | |
472 | ||
20f41eee GR |
473 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
474 | { | |
475 | u8 *list, len; | |
476 | int i, rc; | |
477 | ||
478 | if (cscov < 0 || cscov > 15) | |
479 | return -EINVAL; | |
480 | /* | |
481 | * Populate a list of permissible values, in the range cscov...15. This | |
482 | * is necessary since feature negotiation of single values only works if | |
483 | * both sides incidentally choose the same value. Since the list starts | |
484 | * lowest-value first, negotiation will pick the smallest shared value. | |
485 | */ | |
486 | if (cscov == 0) | |
487 | return 0; | |
488 | len = 16 - cscov; | |
489 | ||
490 | list = kmalloc(len, GFP_KERNEL); | |
491 | if (list == NULL) | |
492 | return -ENOBUFS; | |
493 | ||
494 | for (i = 0; i < len; i++) | |
495 | list[i] = cscov++; | |
496 | ||
497 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); | |
498 | ||
499 | if (rc == 0) { | |
500 | if (rx) | |
501 | dccp_sk(sk)->dccps_pcrlen = cscov; | |
502 | else | |
503 | dccp_sk(sk)->dccps_pcslen = cscov; | |
504 | } | |
505 | kfree(list); | |
506 | return rc; | |
507 | } | |
508 | ||
3fdadf7d DM |
509 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
510 | char __user *optval, int optlen) | |
7c657876 | 511 | { |
09dbc389 GR |
512 | struct dccp_sock *dp = dccp_sk(sk); |
513 | int val, err = 0; | |
7c657876 | 514 | |
73bbe095 GR |
515 | switch (optname) { |
516 | case DCCP_SOCKOPT_PACKET_SIZE: | |
517 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
518 | return 0; | |
519 | case DCCP_SOCKOPT_CHANGE_L: | |
520 | case DCCP_SOCKOPT_CHANGE_R: | |
521 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | if (optlen < (int)sizeof(int)) | |
a84ffe43 ACM |
526 | return -EINVAL; |
527 | ||
528 | if (get_user(val, (int __user *)optval)) | |
529 | return -EFAULT; | |
530 | ||
67e6b629 ACM |
531 | if (optname == DCCP_SOCKOPT_SERVICE) |
532 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 533 | |
67e6b629 | 534 | lock_sock(sk); |
a84ffe43 | 535 | switch (optname) { |
b8599d20 GR |
536 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
537 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
538 | err = -EOPNOTSUPP; | |
539 | else | |
540 | dp->dccps_server_timewait = (val != 0); | |
541 | break; | |
20f41eee GR |
542 | case DCCP_SOCKOPT_SEND_CSCOV: |
543 | err = dccp_setsockopt_cscov(sk, val, false); | |
6f4e5fff | 544 | break; |
20f41eee GR |
545 | case DCCP_SOCKOPT_RECV_CSCOV: |
546 | err = dccp_setsockopt_cscov(sk, val, true); | |
6f4e5fff | 547 | break; |
a84ffe43 ACM |
548 | default: |
549 | err = -ENOPROTOOPT; | |
550 | break; | |
551 | } | |
a84ffe43 | 552 | release_sock(sk); |
73bbe095 | 553 | |
a84ffe43 | 554 | return err; |
7c657876 ACM |
555 | } |
556 | ||
3fdadf7d DM |
557 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
558 | char __user *optval, int optlen) | |
559 | { | |
560 | if (level != SOL_DCCP) | |
561 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
562 | optname, optval, | |
563 | optlen); | |
564 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
565 | } | |
543d9cfe | 566 | |
f21e68ca ACM |
567 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
568 | ||
3fdadf7d DM |
569 | #ifdef CONFIG_COMPAT |
570 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 571 | char __user *optval, int optlen) |
3fdadf7d | 572 | { |
dec73ff0 ACM |
573 | if (level != SOL_DCCP) |
574 | return inet_csk_compat_setsockopt(sk, level, optname, | |
575 | optval, optlen); | |
3fdadf7d DM |
576 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
577 | } | |
543d9cfe | 578 | |
3fdadf7d DM |
579 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
580 | #endif | |
581 | ||
67e6b629 | 582 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 583 | __be32 __user *optval, |
67e6b629 ACM |
584 | int __user *optlen) |
585 | { | |
586 | const struct dccp_sock *dp = dccp_sk(sk); | |
587 | const struct dccp_service_list *sl; | |
588 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
589 | ||
590 | lock_sock(sk); | |
67e6b629 ACM |
591 | if ((sl = dp->dccps_service_list) != NULL) { |
592 | slen = sl->dccpsl_nr * sizeof(u32); | |
593 | total_len += slen; | |
594 | } | |
595 | ||
596 | err = -EINVAL; | |
597 | if (total_len > len) | |
598 | goto out; | |
599 | ||
600 | err = 0; | |
601 | if (put_user(total_len, optlen) || | |
602 | put_user(dp->dccps_service, optval) || | |
603 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
604 | err = -EFAULT; | |
605 | out: | |
606 | release_sock(sk); | |
607 | return err; | |
608 | } | |
609 | ||
3fdadf7d | 610 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 611 | char __user *optval, int __user *optlen) |
7c657876 | 612 | { |
a84ffe43 ACM |
613 | struct dccp_sock *dp; |
614 | int val, len; | |
7c657876 | 615 | |
a84ffe43 ACM |
616 | if (get_user(len, optlen)) |
617 | return -EFAULT; | |
618 | ||
39ebc027 | 619 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
620 | return -EINVAL; |
621 | ||
622 | dp = dccp_sk(sk); | |
623 | ||
624 | switch (optname) { | |
625 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 626 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 627 | return 0; |
88f964db ACM |
628 | case DCCP_SOCKOPT_SERVICE: |
629 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 630 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
631 | case DCCP_SOCKOPT_GET_CUR_MPS: |
632 | val = dp->dccps_mss_cache; | |
7c559a9e | 633 | break; |
71bb4959 GR |
634 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
635 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); | |
b8599d20 GR |
636 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
637 | val = dp->dccps_server_timewait; | |
b8599d20 | 638 | break; |
6f4e5fff GR |
639 | case DCCP_SOCKOPT_SEND_CSCOV: |
640 | val = dp->dccps_pcslen; | |
641 | break; | |
642 | case DCCP_SOCKOPT_RECV_CSCOV: | |
643 | val = dp->dccps_pcrlen; | |
644 | break; | |
88f964db ACM |
645 | case 128 ... 191: |
646 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
647 | len, (u32 __user *)optval, optlen); | |
648 | case 192 ... 255: | |
649 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
650 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
651 | default: |
652 | return -ENOPROTOOPT; | |
653 | } | |
654 | ||
79133506 | 655 | len = sizeof(val); |
a84ffe43 ACM |
656 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
657 | return -EFAULT; | |
658 | ||
659 | return 0; | |
7c657876 ACM |
660 | } |
661 | ||
3fdadf7d DM |
662 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
663 | char __user *optval, int __user *optlen) | |
664 | { | |
665 | if (level != SOL_DCCP) | |
666 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
667 | optname, optval, | |
668 | optlen); | |
669 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
670 | } | |
543d9cfe | 671 | |
f21e68ca ACM |
672 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
673 | ||
3fdadf7d DM |
674 | #ifdef CONFIG_COMPAT |
675 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 676 | char __user *optval, int __user *optlen) |
3fdadf7d | 677 | { |
dec73ff0 ACM |
678 | if (level != SOL_DCCP) |
679 | return inet_csk_compat_getsockopt(sk, level, optname, | |
680 | optval, optlen); | |
3fdadf7d DM |
681 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
682 | } | |
543d9cfe | 683 | |
3fdadf7d DM |
684 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
685 | #endif | |
686 | ||
7c657876 ACM |
687 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
688 | size_t len) | |
689 | { | |
690 | const struct dccp_sock *dp = dccp_sk(sk); | |
691 | const int flags = msg->msg_flags; | |
692 | const int noblock = flags & MSG_DONTWAIT; | |
693 | struct sk_buff *skb; | |
694 | int rc, size; | |
695 | long timeo; | |
696 | ||
697 | if (len > dp->dccps_mss_cache) | |
698 | return -EMSGSIZE; | |
699 | ||
700 | lock_sock(sk); | |
b1308dc0 IM |
701 | |
702 | if (sysctl_dccp_tx_qlen && | |
703 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
704 | rc = -EAGAIN; | |
705 | goto out_release; | |
706 | } | |
707 | ||
27258ee5 | 708 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
709 | |
710 | /* | |
711 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
712 | * so that the trick in dccp_rcv_request_sent_state_process. | |
713 | */ | |
714 | /* Wait for a connection to finish. */ | |
cecd8d0e | 715 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 716 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 717 | goto out_release; |
7c657876 ACM |
718 | |
719 | size = sk->sk_prot->max_header + len; | |
720 | release_sock(sk); | |
721 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
722 | lock_sock(sk); | |
7c657876 ACM |
723 | if (skb == NULL) |
724 | goto out_release; | |
725 | ||
726 | skb_reserve(skb, sk->sk_prot->max_header); | |
727 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
728 | if (rc != 0) |
729 | goto out_discard; | |
730 | ||
97e5848d IM |
731 | skb_queue_tail(&sk->sk_write_queue, skb); |
732 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
733 | out_release: |
734 | release_sock(sk); | |
735 | return rc ? : len; | |
27258ee5 ACM |
736 | out_discard: |
737 | kfree_skb(skb); | |
7c657876 | 738 | goto out_release; |
7c657876 ACM |
739 | } |
740 | ||
f21e68ca ACM |
741 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
742 | ||
7c657876 ACM |
743 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
744 | size_t len, int nonblock, int flags, int *addr_len) | |
745 | { | |
746 | const struct dccp_hdr *dh; | |
7c657876 ACM |
747 | long timeo; |
748 | ||
749 | lock_sock(sk); | |
750 | ||
531669a0 ACM |
751 | if (sk->sk_state == DCCP_LISTEN) { |
752 | len = -ENOTCONN; | |
7c657876 | 753 | goto out; |
7c657876 | 754 | } |
7c657876 | 755 | |
531669a0 | 756 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
757 | |
758 | do { | |
531669a0 | 759 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 760 | |
531669a0 ACM |
761 | if (skb == NULL) |
762 | goto verify_sock_status; | |
7c657876 | 763 | |
531669a0 | 764 | dh = dccp_hdr(skb); |
7c657876 | 765 | |
0c869620 GR |
766 | switch (dh->dccph_type) { |
767 | case DCCP_PKT_DATA: | |
768 | case DCCP_PKT_DATAACK: | |
531669a0 | 769 | goto found_ok_skb; |
7c657876 | 770 | |
0c869620 GR |
771 | case DCCP_PKT_CLOSE: |
772 | case DCCP_PKT_CLOSEREQ: | |
773 | if (!(flags & MSG_PEEK)) | |
774 | dccp_finish_passive_close(sk); | |
775 | /* fall through */ | |
776 | case DCCP_PKT_RESET: | |
777 | dccp_pr_debug("found fin (%s) ok!\n", | |
778 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
779 | len = 0; |
780 | goto found_fin_ok; | |
0c869620 GR |
781 | default: |
782 | dccp_pr_debug("packet_type=%s\n", | |
783 | dccp_packet_name(dh->dccph_type)); | |
784 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 785 | } |
531669a0 ACM |
786 | verify_sock_status: |
787 | if (sock_flag(sk, SOCK_DONE)) { | |
788 | len = 0; | |
7c657876 | 789 | break; |
531669a0 | 790 | } |
7c657876 | 791 | |
531669a0 ACM |
792 | if (sk->sk_err) { |
793 | len = sock_error(sk); | |
794 | break; | |
795 | } | |
7c657876 | 796 | |
531669a0 ACM |
797 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
798 | len = 0; | |
799 | break; | |
800 | } | |
7c657876 | 801 | |
531669a0 ACM |
802 | if (sk->sk_state == DCCP_CLOSED) { |
803 | if (!sock_flag(sk, SOCK_DONE)) { | |
804 | /* This occurs when user tries to read | |
805 | * from never connected socket. | |
806 | */ | |
807 | len = -ENOTCONN; | |
7c657876 ACM |
808 | break; |
809 | } | |
531669a0 ACM |
810 | len = 0; |
811 | break; | |
7c657876 ACM |
812 | } |
813 | ||
531669a0 ACM |
814 | if (!timeo) { |
815 | len = -EAGAIN; | |
816 | break; | |
817 | } | |
7c657876 | 818 | |
531669a0 ACM |
819 | if (signal_pending(current)) { |
820 | len = sock_intr_errno(timeo); | |
821 | break; | |
822 | } | |
7c657876 | 823 | |
531669a0 | 824 | sk_wait_data(sk, &timeo); |
7c657876 | 825 | continue; |
7c657876 | 826 | found_ok_skb: |
531669a0 ACM |
827 | if (len > skb->len) |
828 | len = skb->len; | |
829 | else if (len < skb->len) | |
830 | msg->msg_flags |= MSG_TRUNC; | |
831 | ||
832 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
833 | /* Exception. Bailout! */ | |
834 | len = -EFAULT; | |
835 | break; | |
7c657876 | 836 | } |
7c657876 ACM |
837 | found_fin_ok: |
838 | if (!(flags & MSG_PEEK)) | |
624d1164 | 839 | sk_eat_skb(sk, skb, 0); |
7c657876 | 840 | break; |
531669a0 | 841 | } while (1); |
7c657876 ACM |
842 | out: |
843 | release_sock(sk); | |
531669a0 | 844 | return len; |
7c657876 ACM |
845 | } |
846 | ||
f21e68ca ACM |
847 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
848 | ||
849 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
850 | { |
851 | struct sock *sk = sock->sk; | |
852 | unsigned char old_state; | |
853 | int err; | |
854 | ||
855 | lock_sock(sk); | |
856 | ||
857 | err = -EINVAL; | |
858 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
859 | goto out; | |
860 | ||
861 | old_state = sk->sk_state; | |
862 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
863 | goto out; | |
864 | ||
865 | /* Really, if the socket is already in listen state | |
866 | * we can only allow the backlog to be adjusted. | |
867 | */ | |
868 | if (old_state != DCCP_LISTEN) { | |
869 | /* | |
870 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
871 | * see tcp_listen_start | |
872 | */ | |
72a3effa | 873 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
874 | if (err) |
875 | goto out; | |
876 | } | |
877 | sk->sk_max_ack_backlog = backlog; | |
878 | err = 0; | |
879 | ||
880 | out: | |
881 | release_sock(sk); | |
882 | return err; | |
883 | } | |
884 | ||
f21e68ca ACM |
885 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
886 | ||
0c869620 | 887 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 888 | { |
0c869620 | 889 | u8 next_state = DCCP_CLOSED; |
7c657876 | 890 | |
0c869620 GR |
891 | switch (sk->sk_state) { |
892 | case DCCP_PASSIVE_CLOSE: | |
893 | case DCCP_PASSIVE_CLOSEREQ: | |
894 | dccp_finish_passive_close(sk); | |
895 | break; | |
896 | case DCCP_PARTOPEN: | |
897 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
898 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
899 | /* fall through */ | |
900 | case DCCP_OPEN: | |
901 | dccp_send_close(sk, 1); | |
7c657876 | 902 | |
b8599d20 GR |
903 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
904 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
905 | next_state = DCCP_ACTIVE_CLOSEREQ; |
906 | else | |
907 | next_state = DCCP_CLOSING; | |
908 | /* fall through */ | |
909 | default: | |
910 | dccp_set_state(sk, next_state); | |
911 | } | |
7c657876 ACM |
912 | } |
913 | ||
914 | void dccp_close(struct sock *sk, long timeout) | |
915 | { | |
97e5848d | 916 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 917 | struct sk_buff *skb; |
d83bd95b | 918 | u32 data_was_unread = 0; |
134af346 | 919 | int state; |
7c657876 ACM |
920 | |
921 | lock_sock(sk); | |
922 | ||
923 | sk->sk_shutdown = SHUTDOWN_MASK; | |
924 | ||
925 | if (sk->sk_state == DCCP_LISTEN) { | |
926 | dccp_set_state(sk, DCCP_CLOSED); | |
927 | ||
928 | /* Special case. */ | |
929 | inet_csk_listen_stop(sk); | |
930 | ||
931 | goto adjudge_to_death; | |
932 | } | |
933 | ||
97e5848d IM |
934 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
935 | ||
7c657876 ACM |
936 | /* |
937 | * We need to flush the recv. buffs. We do this only on the | |
938 | * descriptor close, not protocol-sourced closes, because the | |
939 | *reader process may not have drained the data yet! | |
940 | */ | |
7c657876 | 941 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 942 | data_was_unread += skb->len; |
7c657876 ACM |
943 | __kfree_skb(skb); |
944 | } | |
945 | ||
d83bd95b GR |
946 | if (data_was_unread) { |
947 | /* Unread data was tossed, send an appropriate Reset Code */ | |
948 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
949 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
950 | dccp_set_state(sk, DCCP_CLOSED); | |
951 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
952 | /* Check zero linger _after_ checking for unread data. */ |
953 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
954 | } else if (sk->sk_state != DCCP_CLOSED) { |
955 | dccp_terminate_connection(sk); | |
7c657876 ACM |
956 | } |
957 | ||
958 | sk_stream_wait_close(sk, timeout); | |
959 | ||
960 | adjudge_to_death: | |
134af346 HX |
961 | state = sk->sk_state; |
962 | sock_hold(sk); | |
963 | sock_orphan(sk); | |
964 | atomic_inc(sk->sk_prot->orphan_count); | |
965 | ||
7ad07e7c ACM |
966 | /* |
967 | * It is the last release_sock in its life. It will remove backlog. | |
968 | */ | |
7c657876 ACM |
969 | release_sock(sk); |
970 | /* | |
971 | * Now socket is owned by kernel and we acquire BH lock | |
972 | * to finish close. No need to check for user refs. | |
973 | */ | |
974 | local_bh_disable(); | |
975 | bh_lock_sock(sk); | |
547b792c | 976 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 977 | |
134af346 HX |
978 | /* Have we already been destroyed by a softirq or backlog? */ |
979 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
980 | goto out; | |
7ad07e7c | 981 | |
7c657876 ACM |
982 | if (sk->sk_state == DCCP_CLOSED) |
983 | inet_csk_destroy_sock(sk); | |
984 | ||
985 | /* Otherwise, socket is reprieved until protocol close. */ | |
986 | ||
134af346 | 987 | out: |
7c657876 ACM |
988 | bh_unlock_sock(sk); |
989 | local_bh_enable(); | |
990 | sock_put(sk); | |
991 | } | |
992 | ||
f21e68ca ACM |
993 | EXPORT_SYMBOL_GPL(dccp_close); |
994 | ||
7c657876 ACM |
995 | void dccp_shutdown(struct sock *sk, int how) |
996 | { | |
8e8c71f1 | 997 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
998 | } |
999 | ||
f21e68ca ACM |
1000 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1001 | ||
24e8b7e4 | 1002 | static inline int dccp_mib_init(void) |
7c657876 | 1003 | { |
24e8b7e4 | 1004 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
7c657876 ACM |
1005 | } |
1006 | ||
24e8b7e4 | 1007 | static inline void dccp_mib_exit(void) |
46f09ffa | 1008 | { |
24e8b7e4 | 1009 | snmp_mib_free((void**)dccp_statistics); |
46f09ffa ACM |
1010 | } |
1011 | ||
7c657876 ACM |
1012 | static int thash_entries; |
1013 | module_param(thash_entries, int, 0444); | |
1014 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1015 | ||
a1d3a355 | 1016 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1017 | int dccp_debug; |
43264991 | 1018 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1019 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1020 | |
1021 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1022 | #endif |
7c657876 ACM |
1023 | |
1024 | static int __init dccp_init(void) | |
1025 | { | |
1026 | unsigned long goal; | |
1027 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1028 | int rc = -ENOBUFS; |
7c657876 | 1029 | |
028b0275 PM |
1030 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1031 | FIELD_SIZEOF(struct sk_buff, cb)); | |
1032 | ||
7690af3f ACM |
1033 | dccp_hashinfo.bind_bucket_cachep = |
1034 | kmem_cache_create("dccp_bind_bucket", | |
1035 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1036 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1037 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1038 | goto out; |
7c657876 ACM |
1039 | |
1040 | /* | |
1041 | * Size and allocate the main established and bind bucket | |
1042 | * hash tables. | |
1043 | * | |
1044 | * The methodology is similar to that of the buffer cache. | |
1045 | */ | |
1046 | if (num_physpages >= (128 * 1024)) | |
1047 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1048 | else | |
1049 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1050 | ||
1051 | if (thash_entries) | |
7690af3f ACM |
1052 | goal = (thash_entries * |
1053 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1054 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1055 | ; | |
1056 | do { | |
1057 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1058 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1059 | while (dccp_hashinfo.ehash_size & |
1060 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1061 | dccp_hashinfo.ehash_size--; |
1062 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1063 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1064 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1065 | ||
1066 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1067 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1068 | goto out_free_bind_bucket_cachep; |
1069 | } | |
1070 | ||
dbca9b27 | 1071 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1072 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1073 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1074 | } |
1075 | ||
230140cf ED |
1076 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1077 | goto out_free_dccp_ehash; | |
1078 | ||
7c657876 ACM |
1079 | bhash_order = ehash_order; |
1080 | ||
1081 | do { | |
1082 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1083 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1084 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1085 | bhash_order > 0) | |
7c657876 ACM |
1086 | continue; |
1087 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1088 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1089 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1090 | ||
1091 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1092 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1093 | goto out_free_dccp_locks; |
7c657876 ACM |
1094 | } |
1095 | ||
1096 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1097 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1098 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1099 | } | |
1100 | ||
46f09ffa | 1101 | rc = dccp_mib_init(); |
fa23e2ec | 1102 | if (rc) |
7c657876 ACM |
1103 | goto out_free_dccp_bhash; |
1104 | ||
9b07ef5d | 1105 | rc = dccp_ackvec_init(); |
7c657876 | 1106 | if (rc) |
b61fafc4 | 1107 | goto out_free_dccp_mib; |
9b07ef5d | 1108 | |
e55d912f | 1109 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1110 | if (rc) |
1111 | goto out_ackvec_exit; | |
4c70f383 GR |
1112 | |
1113 | dccp_timestamping_init(); | |
7c657876 ACM |
1114 | out: |
1115 | return rc; | |
9b07ef5d ACM |
1116 | out_ackvec_exit: |
1117 | dccp_ackvec_exit(); | |
b61fafc4 | 1118 | out_free_dccp_mib: |
46f09ffa | 1119 | dccp_mib_exit(); |
7c657876 ACM |
1120 | out_free_dccp_bhash: |
1121 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1122 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1123 | out_free_dccp_locks: |
1124 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1125 | out_free_dccp_ehash: |
1126 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1127 | dccp_hashinfo.ehash = NULL; | |
1128 | out_free_bind_bucket_cachep: | |
1129 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1130 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1131 | goto out; |
1132 | } | |
1133 | ||
7c657876 ACM |
1134 | static void __exit dccp_fini(void) |
1135 | { | |
46f09ffa | 1136 | dccp_mib_exit(); |
725ba8ee ACM |
1137 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1138 | get_order(dccp_hashinfo.bhash_size * | |
1139 | sizeof(struct inet_bind_hashbucket))); | |
1140 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1141 | get_order(dccp_hashinfo.ehash_size * | |
1142 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1143 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1144 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1145 | dccp_ackvec_exit(); |
e55d912f | 1146 | dccp_sysctl_exit(); |
7c657876 ACM |
1147 | } |
1148 | ||
1149 | module_init(dccp_init); | |
1150 | module_exit(dccp_fini); | |
1151 | ||
7c657876 ACM |
1152 | MODULE_LICENSE("GPL"); |
1153 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1154 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |