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); | |
6eb55d17 GR |
64 | /* Client retransmits all Confirm options until entering OPEN */ |
65 | if (oldstate == DCCP_PARTOPEN) | |
66 | dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); | |
c25a18ba ACM |
67 | break; |
68 | ||
69 | case DCCP_CLOSED: | |
0c869620 GR |
70 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
71 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
72 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
73 | ||
74 | sk->sk_prot->unhash(sk); | |
75 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
76 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 77 | inet_put_port(sk); |
c25a18ba ACM |
78 | /* fall through */ |
79 | default: | |
80 | if (oldstate == DCCP_OPEN) | |
81 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
82 | } | |
83 | ||
84 | /* Change state AFTER socket is unhashed to avoid closed | |
85 | * socket sitting in hash tables. | |
86 | */ | |
87 | sk->sk_state = state; | |
88 | } | |
89 | ||
90 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
91 | ||
0c869620 GR |
92 | static void dccp_finish_passive_close(struct sock *sk) |
93 | { | |
94 | switch (sk->sk_state) { | |
95 | case DCCP_PASSIVE_CLOSE: | |
96 | /* Node (client or server) has received Close packet. */ | |
97 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
98 | dccp_set_state(sk, DCCP_CLOSED); | |
99 | break; | |
100 | case DCCP_PASSIVE_CLOSEREQ: | |
101 | /* | |
102 | * Client received CloseReq. We set the `active' flag so that | |
103 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
104 | */ | |
105 | dccp_send_close(sk, 1); | |
106 | dccp_set_state(sk, DCCP_CLOSING); | |
107 | } | |
108 | } | |
109 | ||
c25a18ba ACM |
110 | void dccp_done(struct sock *sk) |
111 | { | |
112 | dccp_set_state(sk, DCCP_CLOSED); | |
113 | dccp_clear_xmit_timers(sk); | |
114 | ||
115 | sk->sk_shutdown = SHUTDOWN_MASK; | |
116 | ||
117 | if (!sock_flag(sk, SOCK_DEAD)) | |
118 | sk->sk_state_change(sk); | |
119 | else | |
120 | inet_csk_destroy_sock(sk); | |
121 | } | |
122 | ||
123 | EXPORT_SYMBOL_GPL(dccp_done); | |
124 | ||
7c657876 ACM |
125 | const char *dccp_packet_name(const int type) |
126 | { | |
127 | static const char *dccp_packet_names[] = { | |
128 | [DCCP_PKT_REQUEST] = "REQUEST", | |
129 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
130 | [DCCP_PKT_DATA] = "DATA", | |
131 | [DCCP_PKT_ACK] = "ACK", | |
132 | [DCCP_PKT_DATAACK] = "DATAACK", | |
133 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
134 | [DCCP_PKT_CLOSE] = "CLOSE", | |
135 | [DCCP_PKT_RESET] = "RESET", | |
136 | [DCCP_PKT_SYNC] = "SYNC", | |
137 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
138 | }; | |
139 | ||
140 | if (type >= DCCP_NR_PKT_TYPES) | |
141 | return "INVALID"; | |
142 | else | |
143 | return dccp_packet_names[type]; | |
144 | } | |
145 | ||
146 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
147 | ||
148 | const char *dccp_state_name(const int state) | |
149 | { | |
150 | static char *dccp_state_names[] = { | |
f11135a3 GR |
151 | [DCCP_OPEN] = "OPEN", |
152 | [DCCP_REQUESTING] = "REQUESTING", | |
153 | [DCCP_PARTOPEN] = "PARTOPEN", | |
154 | [DCCP_LISTEN] = "LISTEN", | |
155 | [DCCP_RESPOND] = "RESPOND", | |
156 | [DCCP_CLOSING] = "CLOSING", | |
157 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
158 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
159 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
160 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
161 | [DCCP_CLOSED] = "CLOSED", | |
7c657876 ACM |
162 | }; |
163 | ||
164 | if (state >= DCCP_MAX_STATES) | |
165 | return "INVALID STATE!"; | |
166 | else | |
167 | return dccp_state_names[state]; | |
168 | } | |
169 | ||
170 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
171 | ||
72478873 | 172 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
173 | { |
174 | struct dccp_sock *dp = dccp_sk(sk); | |
175 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3e0fadc5 | 176 | |
410e27a4 GR |
177 | dccp_minisock_init(&dp->dccps_minisock); |
178 | ||
e18d7a98 ACM |
179 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
180 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
181 | sk->sk_state = DCCP_CLOSED; | |
182 | sk->sk_write_space = dccp_write_space; | |
183 | icsk->icsk_sync_mss = dccp_sync_mss; | |
410e27a4 | 184 | dp->dccps_mss_cache = 536; |
e18d7a98 ACM |
185 | dp->dccps_rate_last = jiffies; |
186 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
187 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
410e27a4 | 188 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
e18d7a98 ACM |
189 | |
190 | dccp_init_xmit_timers(sk); | |
191 | ||
ac75773c | 192 | INIT_LIST_HEAD(&dp->dccps_featneg); |
6eb55d17 GR |
193 | /* control socket doesn't need feat nego */ |
194 | if (likely(ctl_sock_initialized)) | |
195 | return dccp_feat_init(sk); | |
3e0fadc5 ACM |
196 | return 0; |
197 | } | |
198 | ||
199 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
200 | ||
7d06b2e0 | 201 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
202 | { |
203 | struct dccp_sock *dp = dccp_sk(sk); | |
204 | ||
205 | /* | |
206 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
207 | * for retransmissions | |
208 | */ | |
209 | if (sk->sk_send_head != NULL) { | |
210 | kfree_skb(sk->sk_send_head); | |
211 | sk->sk_send_head = NULL; | |
212 | } | |
213 | ||
214 | /* Clean up a referenced DCCP bind bucket. */ | |
215 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 216 | inet_put_port(sk); |
3e0fadc5 ACM |
217 | |
218 | kfree(dp->dccps_service_list); | |
219 | dp->dccps_service_list = NULL; | |
220 | ||
6fdd34d4 | 221 | if (dp->dccps_hc_rx_ackvec != NULL) { |
3e0fadc5 ACM |
222 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
223 | dp->dccps_hc_rx_ackvec = NULL; | |
224 | } | |
225 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
226 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
227 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
228 | ||
229 | /* clean up feature negotiation state */ | |
d99a7bd2 | 230 | dccp_feat_list_purge(&dp->dccps_featneg); |
3e0fadc5 ACM |
231 | } |
232 | ||
233 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
234 | ||
72a3effa | 235 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 236 | { |
67e6b629 ACM |
237 | struct dccp_sock *dp = dccp_sk(sk); |
238 | ||
239 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
9eca0a47 GR |
240 | /* do not start to listen if feature negotiation setup fails */ |
241 | if (dccp_feat_finalise_settings(dp)) | |
242 | return -EPROTO; | |
72a3effa | 243 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
244 | } |
245 | ||
ce865a61 GR |
246 | static inline int dccp_need_reset(int state) |
247 | { | |
248 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
249 | state != DCCP_REQUESTING; | |
250 | } | |
251 | ||
7c657876 ACM |
252 | int dccp_disconnect(struct sock *sk, int flags) |
253 | { | |
254 | struct inet_connection_sock *icsk = inet_csk(sk); | |
255 | struct inet_sock *inet = inet_sk(sk); | |
256 | int err = 0; | |
257 | const int old_state = sk->sk_state; | |
258 | ||
259 | if (old_state != DCCP_CLOSED) | |
260 | dccp_set_state(sk, DCCP_CLOSED); | |
261 | ||
ce865a61 GR |
262 | /* |
263 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
264 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
265 | */ | |
7c657876 ACM |
266 | if (old_state == DCCP_LISTEN) { |
267 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
268 | } else if (dccp_need_reset(old_state)) { |
269 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
270 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
271 | } else if (old_state == DCCP_REQUESTING) |
272 | sk->sk_err = ECONNRESET; | |
273 | ||
274 | dccp_clear_xmit_timers(sk); | |
48816322 | 275 | |
7c657876 | 276 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 277 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
278 | if (sk->sk_send_head != NULL) { |
279 | __kfree_skb(sk->sk_send_head); | |
280 | sk->sk_send_head = NULL; | |
281 | } | |
282 | ||
283 | inet->dport = 0; | |
284 | ||
285 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
286 | inet_reset_saddr(sk); | |
287 | ||
288 | sk->sk_shutdown = 0; | |
289 | sock_reset_flag(sk, SOCK_DONE); | |
290 | ||
291 | icsk->icsk_backoff = 0; | |
292 | inet_csk_delack_init(sk); | |
293 | __sk_dst_reset(sk); | |
294 | ||
547b792c | 295 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
7c657876 ACM |
296 | |
297 | sk->sk_error_report(sk); | |
298 | return err; | |
299 | } | |
300 | ||
f21e68ca ACM |
301 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
302 | ||
331968bd ACM |
303 | /* |
304 | * Wait for a DCCP event. | |
305 | * | |
306 | * Note that we don't need to lock the socket, as the upper poll layers | |
307 | * take care of normal races (between the test and the event) and we don't | |
308 | * go look at any of the socket buffers directly. | |
309 | */ | |
f21e68ca ACM |
310 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
311 | poll_table *wait) | |
331968bd ACM |
312 | { |
313 | unsigned int mask; | |
314 | struct sock *sk = sock->sk; | |
315 | ||
316 | poll_wait(file, sk->sk_sleep, wait); | |
317 | if (sk->sk_state == DCCP_LISTEN) | |
318 | return inet_csk_listen_poll(sk); | |
319 | ||
320 | /* Socket is not locked. We are protected from async events | |
321 | by poll logic and correct handling of state changes | |
322 | made by another threads is impossible in any case. | |
323 | */ | |
324 | ||
325 | mask = 0; | |
326 | if (sk->sk_err) | |
327 | mask = POLLERR; | |
328 | ||
329 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
330 | mask |= POLLHUP; | |
331 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 332 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
333 | |
334 | /* Connected? */ | |
335 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
336 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
337 | mask |= POLLIN | POLLRDNORM; | |
338 | ||
339 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
340 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
341 | mask |= POLLOUT | POLLWRNORM; | |
342 | } else { /* send SIGIO later */ | |
343 | set_bit(SOCK_ASYNC_NOSPACE, | |
344 | &sk->sk_socket->flags); | |
345 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
346 | ||
347 | /* Race breaker. If space is freed after | |
348 | * wspace test but before the flags are set, | |
349 | * IO signal will be lost. | |
350 | */ | |
351 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
352 | mask |= POLLOUT | POLLWRNORM; | |
353 | } | |
354 | } | |
355 | } | |
356 | return mask; | |
357 | } | |
358 | ||
f21e68ca ACM |
359 | EXPORT_SYMBOL_GPL(dccp_poll); |
360 | ||
7c657876 ACM |
361 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
362 | { | |
6273172e ACM |
363 | int rc = -ENOTCONN; |
364 | ||
365 | lock_sock(sk); | |
366 | ||
367 | if (sk->sk_state == DCCP_LISTEN) | |
368 | goto out; | |
369 | ||
370 | switch (cmd) { | |
371 | case SIOCINQ: { | |
372 | struct sk_buff *skb; | |
373 | unsigned long amount = 0; | |
374 | ||
375 | skb = skb_peek(&sk->sk_receive_queue); | |
376 | if (skb != NULL) { | |
377 | /* | |
378 | * We will only return the amount of this packet since | |
379 | * that is all that will be read. | |
380 | */ | |
381 | amount = skb->len; | |
382 | } | |
383 | rc = put_user(amount, (int __user *)arg); | |
384 | } | |
385 | break; | |
386 | default: | |
387 | rc = -ENOIOCTLCMD; | |
388 | break; | |
389 | } | |
390 | out: | |
391 | release_sock(sk); | |
392 | return rc; | |
7c657876 ACM |
393 | } |
394 | ||
f21e68ca ACM |
395 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
396 | ||
60fe62e7 | 397 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
398 | char __user *optval, int optlen) |
399 | { | |
400 | struct dccp_sock *dp = dccp_sk(sk); | |
401 | struct dccp_service_list *sl = NULL; | |
402 | ||
8109b02b | 403 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
404 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
405 | return -EINVAL; | |
406 | ||
407 | if (optlen > sizeof(service)) { | |
408 | sl = kmalloc(optlen, GFP_KERNEL); | |
409 | if (sl == NULL) | |
410 | return -ENOMEM; | |
411 | ||
412 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
413 | if (copy_from_user(sl->dccpsl_list, | |
414 | optval + sizeof(service), | |
415 | optlen - sizeof(service)) || | |
416 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
417 | kfree(sl); | |
418 | return -EFAULT; | |
419 | } | |
420 | } | |
421 | ||
422 | lock_sock(sk); | |
423 | dp->dccps_service = service; | |
424 | ||
a51482bd | 425 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
426 | |
427 | dp->dccps_service_list = sl; | |
428 | release_sock(sk); | |
429 | return 0; | |
430 | } | |
431 | ||
29450559 GR |
432 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
433 | { | |
434 | u8 *list, len; | |
435 | int i, rc; | |
436 | ||
437 | if (cscov < 0 || cscov > 15) | |
438 | return -EINVAL; | |
439 | /* | |
440 | * Populate a list of permissible values, in the range cscov...15. This | |
441 | * is necessary since feature negotiation of single values only works if | |
442 | * both sides incidentally choose the same value. Since the list starts | |
443 | * lowest-value first, negotiation will pick the smallest shared value. | |
444 | */ | |
445 | if (cscov == 0) | |
446 | return 0; | |
447 | len = 16 - cscov; | |
448 | ||
449 | list = kmalloc(len, GFP_KERNEL); | |
450 | if (list == NULL) | |
451 | return -ENOBUFS; | |
452 | ||
453 | for (i = 0; i < len; i++) | |
454 | list[i] = cscov++; | |
455 | ||
456 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); | |
457 | ||
458 | if (rc == 0) { | |
459 | if (rx) | |
460 | dccp_sk(sk)->dccps_pcrlen = cscov; | |
461 | else | |
462 | dccp_sk(sk)->dccps_pcslen = cscov; | |
463 | } | |
464 | kfree(list); | |
465 | return rc; | |
466 | } | |
467 | ||
b20a9c24 GR |
468 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
469 | char __user *optval, int optlen) | |
470 | { | |
471 | u8 *val; | |
472 | int rc = 0; | |
473 | ||
474 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) | |
475 | return -EINVAL; | |
476 | ||
477 | val = kmalloc(optlen, GFP_KERNEL); | |
478 | if (val == NULL) | |
479 | return -ENOMEM; | |
480 | ||
481 | if (copy_from_user(val, optval, optlen)) { | |
482 | kfree(val); | |
483 | return -EFAULT; | |
484 | } | |
485 | ||
486 | lock_sock(sk); | |
487 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) | |
488 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); | |
489 | ||
490 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) | |
491 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); | |
492 | release_sock(sk); | |
493 | ||
494 | kfree(val); | |
495 | return rc; | |
496 | } | |
497 | ||
3fdadf7d DM |
498 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
499 | char __user *optval, int optlen) | |
7c657876 | 500 | { |
09dbc389 GR |
501 | struct dccp_sock *dp = dccp_sk(sk); |
502 | int val, err = 0; | |
7c657876 | 503 | |
19102996 GR |
504 | switch (optname) { |
505 | case DCCP_SOCKOPT_PACKET_SIZE: | |
506 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
507 | return 0; | |
508 | case DCCP_SOCKOPT_CHANGE_L: | |
509 | case DCCP_SOCKOPT_CHANGE_R: | |
510 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); | |
511 | return 0; | |
b20a9c24 GR |
512 | case DCCP_SOCKOPT_CCID: |
513 | case DCCP_SOCKOPT_RX_CCID: | |
514 | case DCCP_SOCKOPT_TX_CCID: | |
515 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); | |
19102996 GR |
516 | } |
517 | ||
518 | if (optlen < (int)sizeof(int)) | |
a84ffe43 ACM |
519 | return -EINVAL; |
520 | ||
521 | if (get_user(val, (int __user *)optval)) | |
522 | return -EFAULT; | |
523 | ||
67e6b629 ACM |
524 | if (optname == DCCP_SOCKOPT_SERVICE) |
525 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 526 | |
67e6b629 | 527 | lock_sock(sk); |
a84ffe43 | 528 | switch (optname) { |
b8599d20 GR |
529 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
530 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
531 | err = -EOPNOTSUPP; | |
532 | else | |
533 | dp->dccps_server_timewait = (val != 0); | |
534 | break; | |
29450559 GR |
535 | case DCCP_SOCKOPT_SEND_CSCOV: |
536 | err = dccp_setsockopt_cscov(sk, val, false); | |
d6da3511 | 537 | break; |
29450559 GR |
538 | case DCCP_SOCKOPT_RECV_CSCOV: |
539 | err = dccp_setsockopt_cscov(sk, val, true); | |
d6da3511 | 540 | break; |
a84ffe43 ACM |
541 | default: |
542 | err = -ENOPROTOOPT; | |
543 | break; | |
544 | } | |
410e27a4 | 545 | release_sock(sk); |
19102996 | 546 | |
a84ffe43 | 547 | return err; |
7c657876 ACM |
548 | } |
549 | ||
3fdadf7d DM |
550 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
551 | char __user *optval, int optlen) | |
552 | { | |
553 | if (level != SOL_DCCP) | |
554 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
555 | optname, optval, | |
556 | optlen); | |
557 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
558 | } | |
543d9cfe | 559 | |
f21e68ca ACM |
560 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
561 | ||
3fdadf7d DM |
562 | #ifdef CONFIG_COMPAT |
563 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 564 | char __user *optval, int optlen) |
3fdadf7d | 565 | { |
dec73ff0 ACM |
566 | if (level != SOL_DCCP) |
567 | return inet_csk_compat_setsockopt(sk, level, optname, | |
568 | optval, optlen); | |
3fdadf7d DM |
569 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
570 | } | |
543d9cfe | 571 | |
3fdadf7d DM |
572 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
573 | #endif | |
574 | ||
67e6b629 | 575 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 576 | __be32 __user *optval, |
67e6b629 ACM |
577 | int __user *optlen) |
578 | { | |
579 | const struct dccp_sock *dp = dccp_sk(sk); | |
580 | const struct dccp_service_list *sl; | |
581 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
582 | ||
583 | lock_sock(sk); | |
67e6b629 ACM |
584 | if ((sl = dp->dccps_service_list) != NULL) { |
585 | slen = sl->dccpsl_nr * sizeof(u32); | |
586 | total_len += slen; | |
587 | } | |
588 | ||
589 | err = -EINVAL; | |
590 | if (total_len > len) | |
591 | goto out; | |
592 | ||
593 | err = 0; | |
594 | if (put_user(total_len, optlen) || | |
595 | put_user(dp->dccps_service, optval) || | |
596 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
597 | err = -EFAULT; | |
598 | out: | |
599 | release_sock(sk); | |
600 | return err; | |
601 | } | |
602 | ||
3fdadf7d | 603 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 604 | char __user *optval, int __user *optlen) |
7c657876 | 605 | { |
a84ffe43 ACM |
606 | struct dccp_sock *dp; |
607 | int val, len; | |
7c657876 | 608 | |
a84ffe43 ACM |
609 | if (get_user(len, optlen)) |
610 | return -EFAULT; | |
611 | ||
39ebc027 | 612 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
613 | return -EINVAL; |
614 | ||
615 | dp = dccp_sk(sk); | |
616 | ||
617 | switch (optname) { | |
618 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 619 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 620 | return 0; |
88f964db ACM |
621 | case DCCP_SOCKOPT_SERVICE: |
622 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 623 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
624 | case DCCP_SOCKOPT_GET_CUR_MPS: |
625 | val = dp->dccps_mss_cache; | |
7c559a9e | 626 | break; |
d90ebcbf GR |
627 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
628 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); | |
71c262a3 GR |
629 | case DCCP_SOCKOPT_TX_CCID: |
630 | val = ccid_get_current_tx_ccid(dp); | |
631 | if (val < 0) | |
632 | return -ENOPROTOOPT; | |
633 | break; | |
634 | case DCCP_SOCKOPT_RX_CCID: | |
635 | val = ccid_get_current_rx_ccid(dp); | |
636 | if (val < 0) | |
637 | return -ENOPROTOOPT; | |
638 | break; | |
b8599d20 GR |
639 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
640 | val = dp->dccps_server_timewait; | |
b8599d20 | 641 | break; |
6f4e5fff GR |
642 | case DCCP_SOCKOPT_SEND_CSCOV: |
643 | val = dp->dccps_pcslen; | |
644 | break; | |
645 | case DCCP_SOCKOPT_RECV_CSCOV: | |
646 | val = dp->dccps_pcrlen; | |
647 | break; | |
88f964db ACM |
648 | case 128 ... 191: |
649 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
650 | len, (u32 __user *)optval, optlen); | |
651 | case 192 ... 255: | |
652 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
653 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
654 | default: |
655 | return -ENOPROTOOPT; | |
656 | } | |
657 | ||
79133506 | 658 | len = sizeof(val); |
a84ffe43 ACM |
659 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
660 | return -EFAULT; | |
661 | ||
662 | return 0; | |
7c657876 ACM |
663 | } |
664 | ||
3fdadf7d DM |
665 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
666 | char __user *optval, int __user *optlen) | |
667 | { | |
668 | if (level != SOL_DCCP) | |
669 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
670 | optname, optval, | |
671 | optlen); | |
672 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
673 | } | |
543d9cfe | 674 | |
f21e68ca ACM |
675 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
676 | ||
3fdadf7d DM |
677 | #ifdef CONFIG_COMPAT |
678 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 679 | char __user *optval, int __user *optlen) |
3fdadf7d | 680 | { |
dec73ff0 ACM |
681 | if (level != SOL_DCCP) |
682 | return inet_csk_compat_getsockopt(sk, level, optname, | |
683 | optval, optlen); | |
3fdadf7d DM |
684 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
685 | } | |
543d9cfe | 686 | |
3fdadf7d DM |
687 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
688 | #endif | |
689 | ||
7c657876 ACM |
690 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
691 | size_t len) | |
692 | { | |
693 | const struct dccp_sock *dp = dccp_sk(sk); | |
694 | const int flags = msg->msg_flags; | |
695 | const int noblock = flags & MSG_DONTWAIT; | |
696 | struct sk_buff *skb; | |
697 | int rc, size; | |
698 | long timeo; | |
699 | ||
700 | if (len > dp->dccps_mss_cache) | |
701 | return -EMSGSIZE; | |
702 | ||
703 | lock_sock(sk); | |
b1308dc0 | 704 | |
410e27a4 GR |
705 | if (sysctl_dccp_tx_qlen && |
706 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
b1308dc0 IM |
707 | rc = -EAGAIN; |
708 | goto out_release; | |
709 | } | |
710 | ||
27258ee5 | 711 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
712 | |
713 | /* | |
714 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
715 | * so that the trick in dccp_rcv_request_sent_state_process. | |
716 | */ | |
717 | /* Wait for a connection to finish. */ | |
cecd8d0e | 718 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 719 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 720 | goto out_release; |
7c657876 ACM |
721 | |
722 | size = sk->sk_prot->max_header + len; | |
723 | release_sock(sk); | |
724 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
725 | lock_sock(sk); | |
7c657876 ACM |
726 | if (skb == NULL) |
727 | goto out_release; | |
728 | ||
729 | skb_reserve(skb, sk->sk_prot->max_header); | |
730 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
731 | if (rc != 0) |
732 | goto out_discard; | |
733 | ||
410e27a4 GR |
734 | skb_queue_tail(&sk->sk_write_queue, skb); |
735 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
736 | out_release: |
737 | release_sock(sk); | |
738 | return rc ? : len; | |
27258ee5 ACM |
739 | out_discard: |
740 | kfree_skb(skb); | |
7c657876 | 741 | goto out_release; |
7c657876 ACM |
742 | } |
743 | ||
f21e68ca ACM |
744 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
745 | ||
7c657876 ACM |
746 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
747 | size_t len, int nonblock, int flags, int *addr_len) | |
748 | { | |
749 | const struct dccp_hdr *dh; | |
7c657876 ACM |
750 | long timeo; |
751 | ||
752 | lock_sock(sk); | |
753 | ||
531669a0 ACM |
754 | if (sk->sk_state == DCCP_LISTEN) { |
755 | len = -ENOTCONN; | |
7c657876 | 756 | goto out; |
7c657876 | 757 | } |
7c657876 | 758 | |
531669a0 | 759 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
760 | |
761 | do { | |
531669a0 | 762 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 763 | |
531669a0 ACM |
764 | if (skb == NULL) |
765 | goto verify_sock_status; | |
7c657876 | 766 | |
531669a0 | 767 | dh = dccp_hdr(skb); |
7c657876 | 768 | |
0c869620 GR |
769 | switch (dh->dccph_type) { |
770 | case DCCP_PKT_DATA: | |
771 | case DCCP_PKT_DATAACK: | |
531669a0 | 772 | goto found_ok_skb; |
7c657876 | 773 | |
0c869620 GR |
774 | case DCCP_PKT_CLOSE: |
775 | case DCCP_PKT_CLOSEREQ: | |
776 | if (!(flags & MSG_PEEK)) | |
777 | dccp_finish_passive_close(sk); | |
778 | /* fall through */ | |
779 | case DCCP_PKT_RESET: | |
780 | dccp_pr_debug("found fin (%s) ok!\n", | |
781 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
782 | len = 0; |
783 | goto found_fin_ok; | |
0c869620 GR |
784 | default: |
785 | dccp_pr_debug("packet_type=%s\n", | |
786 | dccp_packet_name(dh->dccph_type)); | |
787 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 788 | } |
531669a0 ACM |
789 | verify_sock_status: |
790 | if (sock_flag(sk, SOCK_DONE)) { | |
791 | len = 0; | |
7c657876 | 792 | break; |
531669a0 | 793 | } |
7c657876 | 794 | |
531669a0 ACM |
795 | if (sk->sk_err) { |
796 | len = sock_error(sk); | |
797 | break; | |
798 | } | |
7c657876 | 799 | |
531669a0 ACM |
800 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
801 | len = 0; | |
802 | break; | |
803 | } | |
7c657876 | 804 | |
531669a0 ACM |
805 | if (sk->sk_state == DCCP_CLOSED) { |
806 | if (!sock_flag(sk, SOCK_DONE)) { | |
807 | /* This occurs when user tries to read | |
808 | * from never connected socket. | |
809 | */ | |
810 | len = -ENOTCONN; | |
7c657876 ACM |
811 | break; |
812 | } | |
531669a0 ACM |
813 | len = 0; |
814 | break; | |
7c657876 ACM |
815 | } |
816 | ||
531669a0 ACM |
817 | if (!timeo) { |
818 | len = -EAGAIN; | |
819 | break; | |
820 | } | |
7c657876 | 821 | |
531669a0 ACM |
822 | if (signal_pending(current)) { |
823 | len = sock_intr_errno(timeo); | |
824 | break; | |
825 | } | |
7c657876 | 826 | |
531669a0 | 827 | sk_wait_data(sk, &timeo); |
7c657876 | 828 | continue; |
7c657876 | 829 | found_ok_skb: |
531669a0 ACM |
830 | if (len > skb->len) |
831 | len = skb->len; | |
832 | else if (len < skb->len) | |
833 | msg->msg_flags |= MSG_TRUNC; | |
834 | ||
835 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
836 | /* Exception. Bailout! */ | |
837 | len = -EFAULT; | |
838 | break; | |
7c657876 | 839 | } |
7c657876 ACM |
840 | found_fin_ok: |
841 | if (!(flags & MSG_PEEK)) | |
624d1164 | 842 | sk_eat_skb(sk, skb, 0); |
7c657876 | 843 | break; |
531669a0 | 844 | } while (1); |
7c657876 ACM |
845 | out: |
846 | release_sock(sk); | |
531669a0 | 847 | return len; |
7c657876 ACM |
848 | } |
849 | ||
f21e68ca ACM |
850 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
851 | ||
852 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
853 | { |
854 | struct sock *sk = sock->sk; | |
855 | unsigned char old_state; | |
856 | int err; | |
857 | ||
858 | lock_sock(sk); | |
859 | ||
860 | err = -EINVAL; | |
861 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
862 | goto out; | |
863 | ||
864 | old_state = sk->sk_state; | |
865 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
866 | goto out; | |
867 | ||
868 | /* Really, if the socket is already in listen state | |
869 | * we can only allow the backlog to be adjusted. | |
870 | */ | |
871 | if (old_state != DCCP_LISTEN) { | |
872 | /* | |
873 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
874 | * see tcp_listen_start | |
875 | */ | |
72a3effa | 876 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
877 | if (err) |
878 | goto out; | |
879 | } | |
880 | sk->sk_max_ack_backlog = backlog; | |
881 | err = 0; | |
882 | ||
883 | out: | |
884 | release_sock(sk); | |
885 | return err; | |
886 | } | |
887 | ||
f21e68ca ACM |
888 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
889 | ||
0c869620 | 890 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 891 | { |
0c869620 | 892 | u8 next_state = DCCP_CLOSED; |
7c657876 | 893 | |
0c869620 GR |
894 | switch (sk->sk_state) { |
895 | case DCCP_PASSIVE_CLOSE: | |
896 | case DCCP_PASSIVE_CLOSEREQ: | |
897 | dccp_finish_passive_close(sk); | |
898 | break; | |
899 | case DCCP_PARTOPEN: | |
900 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
901 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
902 | /* fall through */ | |
903 | case DCCP_OPEN: | |
904 | dccp_send_close(sk, 1); | |
7c657876 | 905 | |
b8599d20 GR |
906 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
907 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
908 | next_state = DCCP_ACTIVE_CLOSEREQ; |
909 | else | |
910 | next_state = DCCP_CLOSING; | |
911 | /* fall through */ | |
912 | default: | |
913 | dccp_set_state(sk, next_state); | |
914 | } | |
7c657876 ACM |
915 | } |
916 | ||
917 | void dccp_close(struct sock *sk, long timeout) | |
918 | { | |
97e5848d | 919 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 920 | struct sk_buff *skb; |
d83bd95b | 921 | u32 data_was_unread = 0; |
134af346 | 922 | int state; |
7c657876 ACM |
923 | |
924 | lock_sock(sk); | |
925 | ||
926 | sk->sk_shutdown = SHUTDOWN_MASK; | |
927 | ||
928 | if (sk->sk_state == DCCP_LISTEN) { | |
929 | dccp_set_state(sk, DCCP_CLOSED); | |
930 | ||
931 | /* Special case. */ | |
932 | inet_csk_listen_stop(sk); | |
933 | ||
934 | goto adjudge_to_death; | |
935 | } | |
936 | ||
97e5848d IM |
937 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
938 | ||
7c657876 ACM |
939 | /* |
940 | * We need to flush the recv. buffs. We do this only on the | |
941 | * descriptor close, not protocol-sourced closes, because the | |
942 | *reader process may not have drained the data yet! | |
943 | */ | |
7c657876 | 944 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 945 | data_was_unread += skb->len; |
7c657876 ACM |
946 | __kfree_skb(skb); |
947 | } | |
948 | ||
d83bd95b GR |
949 | if (data_was_unread) { |
950 | /* Unread data was tossed, send an appropriate Reset Code */ | |
951 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
952 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
953 | dccp_set_state(sk, DCCP_CLOSED); | |
954 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
955 | /* Check zero linger _after_ checking for unread data. */ |
956 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
957 | } else if (sk->sk_state != DCCP_CLOSED) { |
958 | dccp_terminate_connection(sk); | |
7c657876 ACM |
959 | } |
960 | ||
961 | sk_stream_wait_close(sk, timeout); | |
962 | ||
963 | adjudge_to_death: | |
134af346 HX |
964 | state = sk->sk_state; |
965 | sock_hold(sk); | |
966 | sock_orphan(sk); | |
134af346 | 967 | |
7ad07e7c ACM |
968 | /* |
969 | * It is the last release_sock in its life. It will remove backlog. | |
970 | */ | |
7c657876 ACM |
971 | release_sock(sk); |
972 | /* | |
973 | * Now socket is owned by kernel and we acquire BH lock | |
974 | * to finish close. No need to check for user refs. | |
975 | */ | |
976 | local_bh_disable(); | |
977 | bh_lock_sock(sk); | |
547b792c | 978 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 979 | |
eb4dea58 HX |
980 | percpu_counter_inc(sk->sk_prot->orphan_count); |
981 | ||
134af346 HX |
982 | /* Have we already been destroyed by a softirq or backlog? */ |
983 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
984 | goto out; | |
7ad07e7c | 985 | |
7c657876 ACM |
986 | if (sk->sk_state == DCCP_CLOSED) |
987 | inet_csk_destroy_sock(sk); | |
988 | ||
989 | /* Otherwise, socket is reprieved until protocol close. */ | |
990 | ||
134af346 | 991 | out: |
7c657876 ACM |
992 | bh_unlock_sock(sk); |
993 | local_bh_enable(); | |
994 | sock_put(sk); | |
995 | } | |
996 | ||
f21e68ca ACM |
997 | EXPORT_SYMBOL_GPL(dccp_close); |
998 | ||
7c657876 ACM |
999 | void dccp_shutdown(struct sock *sk, int how) |
1000 | { | |
8e8c71f1 | 1001 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1002 | } |
1003 | ||
f21e68ca ACM |
1004 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1005 | ||
24e8b7e4 | 1006 | static inline int dccp_mib_init(void) |
7c657876 | 1007 | { |
24e8b7e4 | 1008 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
7c657876 ACM |
1009 | } |
1010 | ||
24e8b7e4 | 1011 | static inline void dccp_mib_exit(void) |
46f09ffa | 1012 | { |
24e8b7e4 | 1013 | snmp_mib_free((void**)dccp_statistics); |
46f09ffa ACM |
1014 | } |
1015 | ||
7c657876 ACM |
1016 | static int thash_entries; |
1017 | module_param(thash_entries, int, 0444); | |
1018 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1019 | ||
a1d3a355 | 1020 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1021 | int dccp_debug; |
43264991 | 1022 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1023 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1024 | |
1025 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1026 | #endif |
7c657876 ACM |
1027 | |
1028 | static int __init dccp_init(void) | |
1029 | { | |
1030 | unsigned long goal; | |
1031 | int ehash_order, bhash_order, i; | |
dd24c001 | 1032 | int rc; |
7c657876 | 1033 | |
028b0275 PM |
1034 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1035 | FIELD_SIZEOF(struct sk_buff, cb)); | |
dd24c001 ED |
1036 | rc = percpu_counter_init(&dccp_orphan_count, 0); |
1037 | if (rc) | |
1038 | goto out; | |
1039 | rc = -ENOBUFS; | |
5caea4ea | 1040 | inet_hashinfo_init(&dccp_hashinfo); |
7690af3f ACM |
1041 | dccp_hashinfo.bind_bucket_cachep = |
1042 | kmem_cache_create("dccp_bind_bucket", | |
1043 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1044 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1045 | if (!dccp_hashinfo.bind_bucket_cachep) |
dd24c001 | 1046 | goto out_free_percpu; |
7c657876 ACM |
1047 | |
1048 | /* | |
1049 | * Size and allocate the main established and bind bucket | |
1050 | * hash tables. | |
1051 | * | |
1052 | * The methodology is similar to that of the buffer cache. | |
1053 | */ | |
1054 | if (num_physpages >= (128 * 1024)) | |
1055 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1056 | else | |
1057 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1058 | ||
1059 | if (thash_entries) | |
7690af3f ACM |
1060 | goal = (thash_entries * |
1061 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1062 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1063 | ; | |
1064 | do { | |
1065 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1066 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1067 | while (dccp_hashinfo.ehash_size & |
1068 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1069 | dccp_hashinfo.ehash_size--; |
1070 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1071 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1072 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1073 | ||
1074 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1075 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1076 | goto out_free_bind_bucket_cachep; |
1077 | } | |
1078 | ||
dbca9b27 | 1079 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
3ab5aee7 ED |
1080 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); |
1081 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i); | |
7c657876 ACM |
1082 | } |
1083 | ||
230140cf ED |
1084 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1085 | goto out_free_dccp_ehash; | |
1086 | ||
7c657876 ACM |
1087 | bhash_order = ehash_order; |
1088 | ||
1089 | do { | |
1090 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1091 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1092 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1093 | bhash_order > 0) | |
7c657876 ACM |
1094 | continue; |
1095 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1096 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1097 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1098 | ||
1099 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1100 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1101 | goto out_free_dccp_locks; |
7c657876 ACM |
1102 | } |
1103 | ||
1104 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1105 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1106 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1107 | } | |
1108 | ||
46f09ffa | 1109 | rc = dccp_mib_init(); |
fa23e2ec | 1110 | if (rc) |
7c657876 ACM |
1111 | goto out_free_dccp_bhash; |
1112 | ||
9b07ef5d | 1113 | rc = dccp_ackvec_init(); |
7c657876 | 1114 | if (rc) |
b61fafc4 | 1115 | goto out_free_dccp_mib; |
9b07ef5d | 1116 | |
e55d912f | 1117 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1118 | if (rc) |
1119 | goto out_ackvec_exit; | |
4c70f383 | 1120 | |
ddebc973 GR |
1121 | rc = ccid_initialize_builtins(); |
1122 | if (rc) | |
1123 | goto out_sysctl_exit; | |
1124 | ||
4c70f383 | 1125 | dccp_timestamping_init(); |
7c657876 ACM |
1126 | out: |
1127 | return rc; | |
ddebc973 GR |
1128 | out_sysctl_exit: |
1129 | dccp_sysctl_exit(); | |
9b07ef5d ACM |
1130 | out_ackvec_exit: |
1131 | dccp_ackvec_exit(); | |
b61fafc4 | 1132 | out_free_dccp_mib: |
46f09ffa | 1133 | dccp_mib_exit(); |
7c657876 ACM |
1134 | out_free_dccp_bhash: |
1135 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1136 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1137 | out_free_dccp_locks: |
1138 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1139 | out_free_dccp_ehash: |
1140 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1141 | dccp_hashinfo.ehash = NULL; | |
1142 | out_free_bind_bucket_cachep: | |
1143 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1144 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
dd24c001 ED |
1145 | out_free_percpu: |
1146 | percpu_counter_destroy(&dccp_orphan_count); | |
7c657876 ACM |
1147 | goto out; |
1148 | } | |
1149 | ||
7c657876 ACM |
1150 | static void __exit dccp_fini(void) |
1151 | { | |
ddebc973 | 1152 | ccid_cleanup_builtins(); |
46f09ffa | 1153 | dccp_mib_exit(); |
725ba8ee ACM |
1154 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1155 | get_order(dccp_hashinfo.bhash_size * | |
1156 | sizeof(struct inet_bind_hashbucket))); | |
1157 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1158 | get_order(dccp_hashinfo.ehash_size * | |
1159 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1160 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1161 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1162 | dccp_ackvec_exit(); |
e55d912f | 1163 | dccp_sysctl_exit(); |
7c657876 ACM |
1164 | } |
1165 | ||
1166 | module_init(dccp_init); | |
1167 | module_exit(dccp_fini); | |
1168 | ||
7c657876 ACM |
1169 | MODULE_LICENSE("GPL"); |
1170 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1171 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |