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 | ||
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); | |
3a53a9ad GR |
70 | /* Client retransmits all Confirm options until entering OPEN */ |
71 | if (oldstate == DCCP_PARTOPEN) | |
72 | dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); | |
c25a18ba ACM |
73 | break; |
74 | ||
75 | case DCCP_CLOSED: | |
0c869620 GR |
76 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
77 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
78 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
79 | ||
80 | sk->sk_prot->unhash(sk); | |
81 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
82 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 83 | inet_put_port(sk); |
c25a18ba ACM |
84 | /* fall through */ |
85 | default: | |
86 | if (oldstate == DCCP_OPEN) | |
87 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
88 | } | |
89 | ||
90 | /* Change state AFTER socket is unhashed to avoid closed | |
91 | * socket sitting in hash tables. | |
92 | */ | |
93 | sk->sk_state = state; | |
94 | } | |
95 | ||
96 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
97 | ||
0c869620 GR |
98 | static void dccp_finish_passive_close(struct sock *sk) |
99 | { | |
100 | switch (sk->sk_state) { | |
101 | case DCCP_PASSIVE_CLOSE: | |
102 | /* Node (client or server) has received Close packet. */ | |
103 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
104 | dccp_set_state(sk, DCCP_CLOSED); | |
105 | break; | |
106 | case DCCP_PASSIVE_CLOSEREQ: | |
107 | /* | |
108 | * Client received CloseReq. We set the `active' flag so that | |
109 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
110 | */ | |
111 | dccp_send_close(sk, 1); | |
112 | dccp_set_state(sk, DCCP_CLOSING); | |
113 | } | |
114 | } | |
115 | ||
c25a18ba ACM |
116 | void dccp_done(struct sock *sk) |
117 | { | |
118 | dccp_set_state(sk, DCCP_CLOSED); | |
119 | dccp_clear_xmit_timers(sk); | |
120 | ||
121 | sk->sk_shutdown = SHUTDOWN_MASK; | |
122 | ||
123 | if (!sock_flag(sk, SOCK_DEAD)) | |
124 | sk->sk_state_change(sk); | |
125 | else | |
126 | inet_csk_destroy_sock(sk); | |
127 | } | |
128 | ||
129 | EXPORT_SYMBOL_GPL(dccp_done); | |
130 | ||
7c657876 ACM |
131 | const char *dccp_packet_name(const int type) |
132 | { | |
133 | static const char *dccp_packet_names[] = { | |
134 | [DCCP_PKT_REQUEST] = "REQUEST", | |
135 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
136 | [DCCP_PKT_DATA] = "DATA", | |
137 | [DCCP_PKT_ACK] = "ACK", | |
138 | [DCCP_PKT_DATAACK] = "DATAACK", | |
139 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
140 | [DCCP_PKT_CLOSE] = "CLOSE", | |
141 | [DCCP_PKT_RESET] = "RESET", | |
142 | [DCCP_PKT_SYNC] = "SYNC", | |
143 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
144 | }; | |
145 | ||
146 | if (type >= DCCP_NR_PKT_TYPES) | |
147 | return "INVALID"; | |
148 | else | |
149 | return dccp_packet_names[type]; | |
150 | } | |
151 | ||
152 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
153 | ||
154 | const char *dccp_state_name(const int state) | |
155 | { | |
156 | static char *dccp_state_names[] = { | |
f11135a3 GR |
157 | [DCCP_OPEN] = "OPEN", |
158 | [DCCP_REQUESTING] = "REQUESTING", | |
159 | [DCCP_PARTOPEN] = "PARTOPEN", | |
160 | [DCCP_LISTEN] = "LISTEN", | |
161 | [DCCP_RESPOND] = "RESPOND", | |
162 | [DCCP_CLOSING] = "CLOSING", | |
163 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
164 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
165 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
166 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
167 | [DCCP_CLOSED] = "CLOSED", | |
7c657876 ACM |
168 | }; |
169 | ||
170 | if (state >= DCCP_MAX_STATES) | |
171 | return "INVALID STATE!"; | |
172 | else | |
173 | return dccp_state_names[state]; | |
174 | } | |
175 | ||
176 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
177 | ||
72478873 | 178 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
179 | { |
180 | struct dccp_sock *dp = dccp_sk(sk); | |
181 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3e0fadc5 | 182 | |
a4bf3902 | 183 | dccp_minisock_init(&dp->dccps_minisock); |
3e0fadc5 | 184 | |
e18d7a98 ACM |
185 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
186 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
187 | sk->sk_state = DCCP_CLOSED; | |
188 | sk->sk_write_space = dccp_write_space; | |
189 | icsk->icsk_sync_mss = dccp_sync_mss; | |
190 | dp->dccps_mss_cache = 536; | |
191 | dp->dccps_rate_last = jiffies; | |
192 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
193 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
194 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; | |
195 | ||
196 | dccp_init_xmit_timers(sk); | |
197 | ||
828755ce | 198 | INIT_LIST_HEAD(&dp->dccps_featneg); |
3a53a9ad GR |
199 | /* control socket doesn't need feat nego */ |
200 | if (likely(ctl_sock_initialized)) | |
201 | return dccp_feat_init(sk); | |
3e0fadc5 ACM |
202 | return 0; |
203 | } | |
204 | ||
205 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
206 | ||
7d06b2e0 | 207 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
208 | { |
209 | struct dccp_sock *dp = dccp_sk(sk); | |
210 | ||
211 | /* | |
212 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
213 | * for retransmissions | |
214 | */ | |
215 | if (sk->sk_send_head != NULL) { | |
216 | kfree_skb(sk->sk_send_head); | |
217 | sk->sk_send_head = NULL; | |
218 | } | |
219 | ||
220 | /* Clean up a referenced DCCP bind bucket. */ | |
221 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 222 | inet_put_port(sk); |
3e0fadc5 ACM |
223 | |
224 | kfree(dp->dccps_service_list); | |
225 | dp->dccps_service_list = NULL; | |
226 | ||
b235dc4a | 227 | if (dp->dccps_hc_rx_ackvec != NULL) { |
3e0fadc5 ACM |
228 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
229 | dp->dccps_hc_rx_ackvec = NULL; | |
230 | } | |
231 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
232 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
233 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
234 | ||
235 | /* clean up feature negotiation state */ | |
70208383 | 236 | dccp_feat_list_purge(&dp->dccps_featneg); |
3e0fadc5 ACM |
237 | } |
238 | ||
239 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
240 | ||
72a3effa | 241 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 242 | { |
67e6b629 ACM |
243 | struct dccp_sock *dp = dccp_sk(sk); |
244 | ||
245 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
093e1f46 GR |
246 | /* do not start to listen if feature negotiation setup fails */ |
247 | if (dccp_feat_finalise_settings(dp)) | |
248 | return -EPROTO; | |
72a3effa | 249 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
250 | } |
251 | ||
ce865a61 GR |
252 | static inline int dccp_need_reset(int state) |
253 | { | |
254 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
255 | state != DCCP_REQUESTING; | |
256 | } | |
257 | ||
7c657876 ACM |
258 | int dccp_disconnect(struct sock *sk, int flags) |
259 | { | |
260 | struct inet_connection_sock *icsk = inet_csk(sk); | |
261 | struct inet_sock *inet = inet_sk(sk); | |
262 | int err = 0; | |
263 | const int old_state = sk->sk_state; | |
264 | ||
265 | if (old_state != DCCP_CLOSED) | |
266 | dccp_set_state(sk, DCCP_CLOSED); | |
267 | ||
ce865a61 GR |
268 | /* |
269 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
270 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
271 | */ | |
7c657876 ACM |
272 | if (old_state == DCCP_LISTEN) { |
273 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
274 | } else if (dccp_need_reset(old_state)) { |
275 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
276 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
277 | } else if (old_state == DCCP_REQUESTING) |
278 | sk->sk_err = ECONNRESET; | |
279 | ||
280 | dccp_clear_xmit_timers(sk); | |
48816322 | 281 | |
7c657876 | 282 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 283 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
284 | if (sk->sk_send_head != NULL) { |
285 | __kfree_skb(sk->sk_send_head); | |
286 | sk->sk_send_head = NULL; | |
287 | } | |
288 | ||
289 | inet->dport = 0; | |
290 | ||
291 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
292 | inet_reset_saddr(sk); | |
293 | ||
294 | sk->sk_shutdown = 0; | |
295 | sock_reset_flag(sk, SOCK_DONE); | |
296 | ||
297 | icsk->icsk_backoff = 0; | |
298 | inet_csk_delack_init(sk); | |
299 | __sk_dst_reset(sk); | |
300 | ||
547b792c | 301 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
7c657876 ACM |
302 | |
303 | sk->sk_error_report(sk); | |
304 | return err; | |
305 | } | |
306 | ||
f21e68ca ACM |
307 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
308 | ||
331968bd ACM |
309 | /* |
310 | * Wait for a DCCP event. | |
311 | * | |
312 | * Note that we don't need to lock the socket, as the upper poll layers | |
313 | * take care of normal races (between the test and the event) and we don't | |
314 | * go look at any of the socket buffers directly. | |
315 | */ | |
f21e68ca ACM |
316 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
317 | poll_table *wait) | |
331968bd ACM |
318 | { |
319 | unsigned int mask; | |
320 | struct sock *sk = sock->sk; | |
321 | ||
322 | poll_wait(file, sk->sk_sleep, wait); | |
323 | if (sk->sk_state == DCCP_LISTEN) | |
324 | return inet_csk_listen_poll(sk); | |
325 | ||
326 | /* Socket is not locked. We are protected from async events | |
327 | by poll logic and correct handling of state changes | |
328 | made by another threads is impossible in any case. | |
329 | */ | |
330 | ||
331 | mask = 0; | |
332 | if (sk->sk_err) | |
333 | mask = POLLERR; | |
334 | ||
335 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
336 | mask |= POLLHUP; | |
337 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 338 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
339 | |
340 | /* Connected? */ | |
341 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
342 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
343 | mask |= POLLIN | POLLRDNORM; | |
344 | ||
345 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
346 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
347 | mask |= POLLOUT | POLLWRNORM; | |
348 | } else { /* send SIGIO later */ | |
349 | set_bit(SOCK_ASYNC_NOSPACE, | |
350 | &sk->sk_socket->flags); | |
351 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
352 | ||
353 | /* Race breaker. If space is freed after | |
354 | * wspace test but before the flags are set, | |
355 | * IO signal will be lost. | |
356 | */ | |
357 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
358 | mask |= POLLOUT | POLLWRNORM; | |
359 | } | |
360 | } | |
361 | } | |
362 | return mask; | |
363 | } | |
364 | ||
f21e68ca ACM |
365 | EXPORT_SYMBOL_GPL(dccp_poll); |
366 | ||
7c657876 ACM |
367 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
368 | { | |
6273172e ACM |
369 | int rc = -ENOTCONN; |
370 | ||
371 | lock_sock(sk); | |
372 | ||
373 | if (sk->sk_state == DCCP_LISTEN) | |
374 | goto out; | |
375 | ||
376 | switch (cmd) { | |
377 | case SIOCINQ: { | |
378 | struct sk_buff *skb; | |
379 | unsigned long amount = 0; | |
380 | ||
381 | skb = skb_peek(&sk->sk_receive_queue); | |
382 | if (skb != NULL) { | |
383 | /* | |
384 | * We will only return the amount of this packet since | |
385 | * that is all that will be read. | |
386 | */ | |
387 | amount = skb->len; | |
388 | } | |
389 | rc = put_user(amount, (int __user *)arg); | |
390 | } | |
391 | break; | |
392 | default: | |
393 | rc = -ENOIOCTLCMD; | |
394 | break; | |
395 | } | |
396 | out: | |
397 | release_sock(sk); | |
398 | return rc; | |
7c657876 ACM |
399 | } |
400 | ||
f21e68ca ACM |
401 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
402 | ||
60fe62e7 | 403 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
404 | char __user *optval, int optlen) |
405 | { | |
406 | struct dccp_sock *dp = dccp_sk(sk); | |
407 | struct dccp_service_list *sl = NULL; | |
408 | ||
8109b02b | 409 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
410 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
411 | return -EINVAL; | |
412 | ||
413 | if (optlen > sizeof(service)) { | |
414 | sl = kmalloc(optlen, GFP_KERNEL); | |
415 | if (sl == NULL) | |
416 | return -ENOMEM; | |
417 | ||
418 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
419 | if (copy_from_user(sl->dccpsl_list, | |
420 | optval + sizeof(service), | |
421 | optlen - sizeof(service)) || | |
422 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
423 | kfree(sl); | |
424 | return -EFAULT; | |
425 | } | |
426 | } | |
427 | ||
428 | lock_sock(sk); | |
429 | dp->dccps_service = service; | |
430 | ||
a51482bd | 431 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
432 | |
433 | dp->dccps_service_list = sl; | |
434 | release_sock(sk); | |
435 | return 0; | |
436 | } | |
437 | ||
20f41eee GR |
438 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
439 | { | |
440 | u8 *list, len; | |
441 | int i, rc; | |
442 | ||
443 | if (cscov < 0 || cscov > 15) | |
444 | return -EINVAL; | |
445 | /* | |
446 | * Populate a list of permissible values, in the range cscov...15. This | |
447 | * is necessary since feature negotiation of single values only works if | |
448 | * both sides incidentally choose the same value. Since the list starts | |
449 | * lowest-value first, negotiation will pick the smallest shared value. | |
450 | */ | |
451 | if (cscov == 0) | |
452 | return 0; | |
453 | len = 16 - cscov; | |
454 | ||
455 | list = kmalloc(len, GFP_KERNEL); | |
456 | if (list == NULL) | |
457 | return -ENOBUFS; | |
458 | ||
459 | for (i = 0; i < len; i++) | |
460 | list[i] = cscov++; | |
461 | ||
462 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); | |
463 | ||
464 | if (rc == 0) { | |
465 | if (rx) | |
466 | dccp_sk(sk)->dccps_pcrlen = cscov; | |
467 | else | |
468 | dccp_sk(sk)->dccps_pcslen = cscov; | |
469 | } | |
470 | kfree(list); | |
471 | return rc; | |
472 | } | |
473 | ||
fade756f GR |
474 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
475 | char __user *optval, int optlen) | |
476 | { | |
477 | u8 *val; | |
478 | int rc = 0; | |
479 | ||
480 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) | |
481 | return -EINVAL; | |
482 | ||
483 | val = kmalloc(optlen, GFP_KERNEL); | |
484 | if (val == NULL) | |
485 | return -ENOMEM; | |
486 | ||
487 | if (copy_from_user(val, optval, optlen)) { | |
488 | kfree(val); | |
489 | return -EFAULT; | |
490 | } | |
491 | ||
492 | lock_sock(sk); | |
493 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) | |
494 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); | |
495 | ||
496 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) | |
497 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); | |
498 | release_sock(sk); | |
499 | ||
500 | kfree(val); | |
501 | return rc; | |
502 | } | |
503 | ||
3fdadf7d DM |
504 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
505 | char __user *optval, int optlen) | |
7c657876 | 506 | { |
09dbc389 GR |
507 | struct dccp_sock *dp = dccp_sk(sk); |
508 | int val, err = 0; | |
7c657876 | 509 | |
73bbe095 GR |
510 | switch (optname) { |
511 | case DCCP_SOCKOPT_PACKET_SIZE: | |
512 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
513 | return 0; | |
514 | case DCCP_SOCKOPT_CHANGE_L: | |
515 | case DCCP_SOCKOPT_CHANGE_R: | |
516 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); | |
517 | return 0; | |
fade756f GR |
518 | case DCCP_SOCKOPT_CCID: |
519 | case DCCP_SOCKOPT_RX_CCID: | |
520 | case DCCP_SOCKOPT_TX_CCID: | |
521 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); | |
73bbe095 GR |
522 | } |
523 | ||
524 | if (optlen < (int)sizeof(int)) | |
a84ffe43 ACM |
525 | return -EINVAL; |
526 | ||
527 | if (get_user(val, (int __user *)optval)) | |
528 | return -EFAULT; | |
529 | ||
67e6b629 ACM |
530 | if (optname == DCCP_SOCKOPT_SERVICE) |
531 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 532 | |
67e6b629 | 533 | lock_sock(sk); |
a84ffe43 | 534 | switch (optname) { |
b8599d20 GR |
535 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
536 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
537 | err = -EOPNOTSUPP; | |
538 | else | |
539 | dp->dccps_server_timewait = (val != 0); | |
540 | break; | |
20f41eee GR |
541 | case DCCP_SOCKOPT_SEND_CSCOV: |
542 | err = dccp_setsockopt_cscov(sk, val, false); | |
6f4e5fff | 543 | break; |
20f41eee GR |
544 | case DCCP_SOCKOPT_RECV_CSCOV: |
545 | err = dccp_setsockopt_cscov(sk, val, true); | |
6f4e5fff | 546 | break; |
a84ffe43 ACM |
547 | default: |
548 | err = -ENOPROTOOPT; | |
549 | break; | |
550 | } | |
a84ffe43 | 551 | release_sock(sk); |
73bbe095 | 552 | |
a84ffe43 | 553 | return err; |
7c657876 ACM |
554 | } |
555 | ||
3fdadf7d DM |
556 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
557 | char __user *optval, int optlen) | |
558 | { | |
559 | if (level != SOL_DCCP) | |
560 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
561 | optname, optval, | |
562 | optlen); | |
563 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
564 | } | |
543d9cfe | 565 | |
f21e68ca ACM |
566 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
567 | ||
3fdadf7d DM |
568 | #ifdef CONFIG_COMPAT |
569 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 570 | char __user *optval, int optlen) |
3fdadf7d | 571 | { |
dec73ff0 ACM |
572 | if (level != SOL_DCCP) |
573 | return inet_csk_compat_setsockopt(sk, level, optname, | |
574 | optval, optlen); | |
3fdadf7d DM |
575 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
576 | } | |
543d9cfe | 577 | |
3fdadf7d DM |
578 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
579 | #endif | |
580 | ||
67e6b629 | 581 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 582 | __be32 __user *optval, |
67e6b629 ACM |
583 | int __user *optlen) |
584 | { | |
585 | const struct dccp_sock *dp = dccp_sk(sk); | |
586 | const struct dccp_service_list *sl; | |
587 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
588 | ||
589 | lock_sock(sk); | |
67e6b629 ACM |
590 | if ((sl = dp->dccps_service_list) != NULL) { |
591 | slen = sl->dccpsl_nr * sizeof(u32); | |
592 | total_len += slen; | |
593 | } | |
594 | ||
595 | err = -EINVAL; | |
596 | if (total_len > len) | |
597 | goto out; | |
598 | ||
599 | err = 0; | |
600 | if (put_user(total_len, optlen) || | |
601 | put_user(dp->dccps_service, optval) || | |
602 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
603 | err = -EFAULT; | |
604 | out: | |
605 | release_sock(sk); | |
606 | return err; | |
607 | } | |
608 | ||
3fdadf7d | 609 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 610 | char __user *optval, int __user *optlen) |
7c657876 | 611 | { |
a84ffe43 ACM |
612 | struct dccp_sock *dp; |
613 | int val, len; | |
7c657876 | 614 | |
a84ffe43 ACM |
615 | if (get_user(len, optlen)) |
616 | return -EFAULT; | |
617 | ||
39ebc027 | 618 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
619 | return -EINVAL; |
620 | ||
621 | dp = dccp_sk(sk); | |
622 | ||
623 | switch (optname) { | |
624 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 625 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 626 | return 0; |
88f964db ACM |
627 | case DCCP_SOCKOPT_SERVICE: |
628 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 629 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
630 | case DCCP_SOCKOPT_GET_CUR_MPS: |
631 | val = dp->dccps_mss_cache; | |
7c559a9e | 632 | break; |
71bb4959 GR |
633 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
634 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); | |
c8041e26 GR |
635 | case DCCP_SOCKOPT_TX_CCID: |
636 | val = ccid_get_current_tx_ccid(dp); | |
637 | if (val < 0) | |
638 | return -ENOPROTOOPT; | |
639 | break; | |
640 | case DCCP_SOCKOPT_RX_CCID: | |
641 | val = ccid_get_current_rx_ccid(dp); | |
642 | if (val < 0) | |
643 | return -ENOPROTOOPT; | |
644 | break; | |
b8599d20 GR |
645 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
646 | val = dp->dccps_server_timewait; | |
b8599d20 | 647 | break; |
6f4e5fff GR |
648 | case DCCP_SOCKOPT_SEND_CSCOV: |
649 | val = dp->dccps_pcslen; | |
650 | break; | |
651 | case DCCP_SOCKOPT_RECV_CSCOV: | |
652 | val = dp->dccps_pcrlen; | |
653 | break; | |
88f964db ACM |
654 | case 128 ... 191: |
655 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
656 | len, (u32 __user *)optval, optlen); | |
657 | case 192 ... 255: | |
658 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
659 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
660 | default: |
661 | return -ENOPROTOOPT; | |
662 | } | |
663 | ||
79133506 | 664 | len = sizeof(val); |
a84ffe43 ACM |
665 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
666 | return -EFAULT; | |
667 | ||
668 | return 0; | |
7c657876 ACM |
669 | } |
670 | ||
3fdadf7d DM |
671 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
672 | char __user *optval, int __user *optlen) | |
673 | { | |
674 | if (level != SOL_DCCP) | |
675 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
676 | optname, optval, | |
677 | optlen); | |
678 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
679 | } | |
543d9cfe | 680 | |
f21e68ca ACM |
681 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
682 | ||
3fdadf7d DM |
683 | #ifdef CONFIG_COMPAT |
684 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 685 | char __user *optval, int __user *optlen) |
3fdadf7d | 686 | { |
dec73ff0 ACM |
687 | if (level != SOL_DCCP) |
688 | return inet_csk_compat_getsockopt(sk, level, optname, | |
689 | optval, optlen); | |
3fdadf7d DM |
690 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
691 | } | |
543d9cfe | 692 | |
3fdadf7d DM |
693 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
694 | #endif | |
695 | ||
7c657876 ACM |
696 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
697 | size_t len) | |
698 | { | |
699 | const struct dccp_sock *dp = dccp_sk(sk); | |
700 | const int flags = msg->msg_flags; | |
701 | const int noblock = flags & MSG_DONTWAIT; | |
702 | struct sk_buff *skb; | |
703 | int rc, size; | |
704 | long timeo; | |
705 | ||
706 | if (len > dp->dccps_mss_cache) | |
707 | return -EMSGSIZE; | |
708 | ||
709 | lock_sock(sk); | |
b1308dc0 IM |
710 | |
711 | if (sysctl_dccp_tx_qlen && | |
712 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
713 | rc = -EAGAIN; | |
714 | goto out_release; | |
715 | } | |
716 | ||
27258ee5 | 717 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
718 | |
719 | /* | |
720 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
721 | * so that the trick in dccp_rcv_request_sent_state_process. | |
722 | */ | |
723 | /* Wait for a connection to finish. */ | |
cecd8d0e | 724 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 725 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 726 | goto out_release; |
7c657876 ACM |
727 | |
728 | size = sk->sk_prot->max_header + len; | |
729 | release_sock(sk); | |
730 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
731 | lock_sock(sk); | |
7c657876 ACM |
732 | if (skb == NULL) |
733 | goto out_release; | |
734 | ||
735 | skb_reserve(skb, sk->sk_prot->max_header); | |
736 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
737 | if (rc != 0) |
738 | goto out_discard; | |
739 | ||
97e5848d IM |
740 | skb_queue_tail(&sk->sk_write_queue, skb); |
741 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
742 | out_release: |
743 | release_sock(sk); | |
744 | return rc ? : len; | |
27258ee5 ACM |
745 | out_discard: |
746 | kfree_skb(skb); | |
7c657876 | 747 | goto out_release; |
7c657876 ACM |
748 | } |
749 | ||
f21e68ca ACM |
750 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
751 | ||
7c657876 ACM |
752 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
753 | size_t len, int nonblock, int flags, int *addr_len) | |
754 | { | |
755 | const struct dccp_hdr *dh; | |
7c657876 ACM |
756 | long timeo; |
757 | ||
758 | lock_sock(sk); | |
759 | ||
531669a0 ACM |
760 | if (sk->sk_state == DCCP_LISTEN) { |
761 | len = -ENOTCONN; | |
7c657876 | 762 | goto out; |
7c657876 | 763 | } |
7c657876 | 764 | |
531669a0 | 765 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
766 | |
767 | do { | |
531669a0 | 768 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 769 | |
531669a0 ACM |
770 | if (skb == NULL) |
771 | goto verify_sock_status; | |
7c657876 | 772 | |
531669a0 | 773 | dh = dccp_hdr(skb); |
7c657876 | 774 | |
0c869620 GR |
775 | switch (dh->dccph_type) { |
776 | case DCCP_PKT_DATA: | |
777 | case DCCP_PKT_DATAACK: | |
531669a0 | 778 | goto found_ok_skb; |
7c657876 | 779 | |
0c869620 GR |
780 | case DCCP_PKT_CLOSE: |
781 | case DCCP_PKT_CLOSEREQ: | |
782 | if (!(flags & MSG_PEEK)) | |
783 | dccp_finish_passive_close(sk); | |
784 | /* fall through */ | |
785 | case DCCP_PKT_RESET: | |
786 | dccp_pr_debug("found fin (%s) ok!\n", | |
787 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
788 | len = 0; |
789 | goto found_fin_ok; | |
0c869620 GR |
790 | default: |
791 | dccp_pr_debug("packet_type=%s\n", | |
792 | dccp_packet_name(dh->dccph_type)); | |
793 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 794 | } |
531669a0 ACM |
795 | verify_sock_status: |
796 | if (sock_flag(sk, SOCK_DONE)) { | |
797 | len = 0; | |
7c657876 | 798 | break; |
531669a0 | 799 | } |
7c657876 | 800 | |
531669a0 ACM |
801 | if (sk->sk_err) { |
802 | len = sock_error(sk); | |
803 | break; | |
804 | } | |
7c657876 | 805 | |
531669a0 ACM |
806 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
807 | len = 0; | |
808 | break; | |
809 | } | |
7c657876 | 810 | |
531669a0 ACM |
811 | if (sk->sk_state == DCCP_CLOSED) { |
812 | if (!sock_flag(sk, SOCK_DONE)) { | |
813 | /* This occurs when user tries to read | |
814 | * from never connected socket. | |
815 | */ | |
816 | len = -ENOTCONN; | |
7c657876 ACM |
817 | break; |
818 | } | |
531669a0 ACM |
819 | len = 0; |
820 | break; | |
7c657876 ACM |
821 | } |
822 | ||
531669a0 ACM |
823 | if (!timeo) { |
824 | len = -EAGAIN; | |
825 | break; | |
826 | } | |
7c657876 | 827 | |
531669a0 ACM |
828 | if (signal_pending(current)) { |
829 | len = sock_intr_errno(timeo); | |
830 | break; | |
831 | } | |
7c657876 | 832 | |
531669a0 | 833 | sk_wait_data(sk, &timeo); |
7c657876 | 834 | continue; |
7c657876 | 835 | found_ok_skb: |
531669a0 ACM |
836 | if (len > skb->len) |
837 | len = skb->len; | |
838 | else if (len < skb->len) | |
839 | msg->msg_flags |= MSG_TRUNC; | |
840 | ||
841 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
842 | /* Exception. Bailout! */ | |
843 | len = -EFAULT; | |
844 | break; | |
7c657876 | 845 | } |
7c657876 ACM |
846 | found_fin_ok: |
847 | if (!(flags & MSG_PEEK)) | |
624d1164 | 848 | sk_eat_skb(sk, skb, 0); |
7c657876 | 849 | break; |
531669a0 | 850 | } while (1); |
7c657876 ACM |
851 | out: |
852 | release_sock(sk); | |
531669a0 | 853 | return len; |
7c657876 ACM |
854 | } |
855 | ||
f21e68ca ACM |
856 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
857 | ||
858 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
859 | { |
860 | struct sock *sk = sock->sk; | |
861 | unsigned char old_state; | |
862 | int err; | |
863 | ||
864 | lock_sock(sk); | |
865 | ||
866 | err = -EINVAL; | |
867 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
868 | goto out; | |
869 | ||
870 | old_state = sk->sk_state; | |
871 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
872 | goto out; | |
873 | ||
874 | /* Really, if the socket is already in listen state | |
875 | * we can only allow the backlog to be adjusted. | |
876 | */ | |
877 | if (old_state != DCCP_LISTEN) { | |
878 | /* | |
879 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
880 | * see tcp_listen_start | |
881 | */ | |
72a3effa | 882 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
883 | if (err) |
884 | goto out; | |
885 | } | |
886 | sk->sk_max_ack_backlog = backlog; | |
887 | err = 0; | |
888 | ||
889 | out: | |
890 | release_sock(sk); | |
891 | return err; | |
892 | } | |
893 | ||
f21e68ca ACM |
894 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
895 | ||
0c869620 | 896 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 897 | { |
0c869620 | 898 | u8 next_state = DCCP_CLOSED; |
7c657876 | 899 | |
0c869620 GR |
900 | switch (sk->sk_state) { |
901 | case DCCP_PASSIVE_CLOSE: | |
902 | case DCCP_PASSIVE_CLOSEREQ: | |
903 | dccp_finish_passive_close(sk); | |
904 | break; | |
905 | case DCCP_PARTOPEN: | |
906 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
907 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
908 | /* fall through */ | |
909 | case DCCP_OPEN: | |
910 | dccp_send_close(sk, 1); | |
7c657876 | 911 | |
b8599d20 GR |
912 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
913 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
914 | next_state = DCCP_ACTIVE_CLOSEREQ; |
915 | else | |
916 | next_state = DCCP_CLOSING; | |
917 | /* fall through */ | |
918 | default: | |
919 | dccp_set_state(sk, next_state); | |
920 | } | |
7c657876 ACM |
921 | } |
922 | ||
923 | void dccp_close(struct sock *sk, long timeout) | |
924 | { | |
97e5848d | 925 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 926 | struct sk_buff *skb; |
d83bd95b | 927 | u32 data_was_unread = 0; |
134af346 | 928 | int state; |
7c657876 ACM |
929 | |
930 | lock_sock(sk); | |
931 | ||
932 | sk->sk_shutdown = SHUTDOWN_MASK; | |
933 | ||
934 | if (sk->sk_state == DCCP_LISTEN) { | |
935 | dccp_set_state(sk, DCCP_CLOSED); | |
936 | ||
937 | /* Special case. */ | |
938 | inet_csk_listen_stop(sk); | |
939 | ||
940 | goto adjudge_to_death; | |
941 | } | |
942 | ||
97e5848d IM |
943 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
944 | ||
7c657876 ACM |
945 | /* |
946 | * We need to flush the recv. buffs. We do this only on the | |
947 | * descriptor close, not protocol-sourced closes, because the | |
948 | *reader process may not have drained the data yet! | |
949 | */ | |
7c657876 | 950 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 951 | data_was_unread += skb->len; |
7c657876 ACM |
952 | __kfree_skb(skb); |
953 | } | |
954 | ||
d83bd95b GR |
955 | if (data_was_unread) { |
956 | /* Unread data was tossed, send an appropriate Reset Code */ | |
957 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
958 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
959 | dccp_set_state(sk, DCCP_CLOSED); | |
960 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
961 | /* Check zero linger _after_ checking for unread data. */ |
962 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
963 | } else if (sk->sk_state != DCCP_CLOSED) { |
964 | dccp_terminate_connection(sk); | |
7c657876 ACM |
965 | } |
966 | ||
967 | sk_stream_wait_close(sk, timeout); | |
968 | ||
969 | adjudge_to_death: | |
134af346 HX |
970 | state = sk->sk_state; |
971 | sock_hold(sk); | |
972 | sock_orphan(sk); | |
973 | atomic_inc(sk->sk_prot->orphan_count); | |
974 | ||
7ad07e7c ACM |
975 | /* |
976 | * It is the last release_sock in its life. It will remove backlog. | |
977 | */ | |
7c657876 ACM |
978 | release_sock(sk); |
979 | /* | |
980 | * Now socket is owned by kernel and we acquire BH lock | |
981 | * to finish close. No need to check for user refs. | |
982 | */ | |
983 | local_bh_disable(); | |
984 | bh_lock_sock(sk); | |
547b792c | 985 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 986 | |
134af346 HX |
987 | /* Have we already been destroyed by a softirq or backlog? */ |
988 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
989 | goto out; | |
7ad07e7c | 990 | |
7c657876 ACM |
991 | if (sk->sk_state == DCCP_CLOSED) |
992 | inet_csk_destroy_sock(sk); | |
993 | ||
994 | /* Otherwise, socket is reprieved until protocol close. */ | |
995 | ||
134af346 | 996 | out: |
7c657876 ACM |
997 | bh_unlock_sock(sk); |
998 | local_bh_enable(); | |
999 | sock_put(sk); | |
1000 | } | |
1001 | ||
f21e68ca ACM |
1002 | EXPORT_SYMBOL_GPL(dccp_close); |
1003 | ||
7c657876 ACM |
1004 | void dccp_shutdown(struct sock *sk, int how) |
1005 | { | |
8e8c71f1 | 1006 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1007 | } |
1008 | ||
f21e68ca ACM |
1009 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1010 | ||
24e8b7e4 | 1011 | static inline int dccp_mib_init(void) |
7c657876 | 1012 | { |
24e8b7e4 | 1013 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
7c657876 ACM |
1014 | } |
1015 | ||
24e8b7e4 | 1016 | static inline void dccp_mib_exit(void) |
46f09ffa | 1017 | { |
24e8b7e4 | 1018 | snmp_mib_free((void**)dccp_statistics); |
46f09ffa ACM |
1019 | } |
1020 | ||
7c657876 ACM |
1021 | static int thash_entries; |
1022 | module_param(thash_entries, int, 0444); | |
1023 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1024 | ||
a1d3a355 | 1025 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1026 | int dccp_debug; |
43264991 | 1027 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1028 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1029 | |
1030 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1031 | #endif |
7c657876 ACM |
1032 | |
1033 | static int __init dccp_init(void) | |
1034 | { | |
1035 | unsigned long goal; | |
1036 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1037 | int rc = -ENOBUFS; |
7c657876 | 1038 | |
028b0275 PM |
1039 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1040 | FIELD_SIZEOF(struct sk_buff, cb)); | |
1041 | ||
7690af3f ACM |
1042 | dccp_hashinfo.bind_bucket_cachep = |
1043 | kmem_cache_create("dccp_bind_bucket", | |
1044 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1045 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1046 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1047 | goto out; |
7c657876 ACM |
1048 | |
1049 | /* | |
1050 | * Size and allocate the main established and bind bucket | |
1051 | * hash tables. | |
1052 | * | |
1053 | * The methodology is similar to that of the buffer cache. | |
1054 | */ | |
1055 | if (num_physpages >= (128 * 1024)) | |
1056 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1057 | else | |
1058 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1059 | ||
1060 | if (thash_entries) | |
7690af3f ACM |
1061 | goal = (thash_entries * |
1062 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1063 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1064 | ; | |
1065 | do { | |
1066 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1067 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1068 | while (dccp_hashinfo.ehash_size & |
1069 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1070 | dccp_hashinfo.ehash_size--; |
1071 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1072 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1073 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1074 | ||
1075 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1076 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1077 | goto out_free_bind_bucket_cachep; |
1078 | } | |
1079 | ||
dbca9b27 | 1080 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1081 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1082 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1083 | } |
1084 | ||
230140cf ED |
1085 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1086 | goto out_free_dccp_ehash; | |
1087 | ||
7c657876 ACM |
1088 | bhash_order = ehash_order; |
1089 | ||
1090 | do { | |
1091 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1092 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1093 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1094 | bhash_order > 0) | |
7c657876 ACM |
1095 | continue; |
1096 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1097 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1098 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1099 | ||
1100 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1101 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1102 | goto out_free_dccp_locks; |
7c657876 ACM |
1103 | } |
1104 | ||
1105 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1106 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1107 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1108 | } | |
1109 | ||
46f09ffa | 1110 | rc = dccp_mib_init(); |
fa23e2ec | 1111 | if (rc) |
7c657876 ACM |
1112 | goto out_free_dccp_bhash; |
1113 | ||
9b07ef5d | 1114 | rc = dccp_ackvec_init(); |
7c657876 | 1115 | if (rc) |
b61fafc4 | 1116 | goto out_free_dccp_mib; |
9b07ef5d | 1117 | |
e55d912f | 1118 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1119 | if (rc) |
1120 | goto out_ackvec_exit; | |
4c70f383 GR |
1121 | |
1122 | dccp_timestamping_init(); | |
7c657876 ACM |
1123 | out: |
1124 | return rc; | |
9b07ef5d ACM |
1125 | out_ackvec_exit: |
1126 | dccp_ackvec_exit(); | |
b61fafc4 | 1127 | out_free_dccp_mib: |
46f09ffa | 1128 | dccp_mib_exit(); |
7c657876 ACM |
1129 | out_free_dccp_bhash: |
1130 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1131 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1132 | out_free_dccp_locks: |
1133 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1134 | out_free_dccp_ehash: |
1135 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1136 | dccp_hashinfo.ehash = NULL; | |
1137 | out_free_bind_bucket_cachep: | |
1138 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1139 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1140 | goto out; |
1141 | } | |
1142 | ||
7c657876 ACM |
1143 | static void __exit dccp_fini(void) |
1144 | { | |
46f09ffa | 1145 | dccp_mib_exit(); |
725ba8ee ACM |
1146 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1147 | get_order(dccp_hashinfo.bhash_size * | |
1148 | sizeof(struct inet_bind_hashbucket))); | |
1149 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1150 | get_order(dccp_hashinfo.ehash_size * | |
1151 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1152 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1153 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1154 | dccp_ackvec_exit(); |
e55d912f | 1155 | dccp_sysctl_exit(); |
7c657876 ACM |
1156 | } |
1157 | ||
1158 | module_init(dccp_init); | |
1159 | module_exit(dccp_fini); | |
1160 | ||
7c657876 ACM |
1161 | MODULE_LICENSE("GPL"); |
1162 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1163 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |