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); | |
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); | |
410e27a4 | 178 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 | 179 | struct inet_connection_sock *icsk = inet_csk(sk); |
3e0fadc5 | 180 | |
410e27a4 GR |
181 | dccp_minisock_init(&dp->dccps_minisock); |
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; | |
410e27a4 | 188 | dp->dccps_mss_cache = 536; |
e18d7a98 ACM |
189 | dp->dccps_rate_last = jiffies; |
190 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
191 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
410e27a4 | 192 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
e18d7a98 ACM |
193 | |
194 | dccp_init_xmit_timers(sk); | |
195 | ||
410e27a4 GR |
196 | /* |
197 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
198 | * the listening (master) sock get CCID control blocks, which is not | |
199 | * necessary, but for now, to not mess with the test userspace apps, | |
200 | * lets leave it here, later the real solution is to do this in a | |
201 | * setsockopt(CCIDs-I-want/accept). -acme | |
202 | */ | |
203 | if (likely(ctl_sock_initialized)) { | |
204 | int rc = dccp_feat_init(dmsk); | |
205 | ||
206 | if (rc) | |
207 | return rc; | |
208 | ||
209 | if (dmsk->dccpms_send_ack_vector) { | |
210 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); | |
211 | if (dp->dccps_hc_rx_ackvec == NULL) | |
212 | return -ENOMEM; | |
213 | } | |
214 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, | |
215 | sk, GFP_KERNEL); | |
216 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, | |
217 | sk, GFP_KERNEL); | |
218 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || | |
219 | dp->dccps_hc_tx_ccid == NULL)) { | |
220 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
221 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
222 | if (dmsk->dccpms_send_ack_vector) { | |
223 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); | |
224 | dp->dccps_hc_rx_ackvec = NULL; | |
225 | } | |
226 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
227 | return -ENOMEM; | |
228 | } | |
229 | } else { | |
230 | /* control socket doesn't need feat nego */ | |
231 | INIT_LIST_HEAD(&dmsk->dccpms_pending); | |
232 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
233 | } | |
234 | ||
3e0fadc5 ACM |
235 | return 0; |
236 | } | |
237 | ||
238 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
239 | ||
7d06b2e0 | 240 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
241 | { |
242 | struct dccp_sock *dp = dccp_sk(sk); | |
410e27a4 | 243 | struct dccp_minisock *dmsk = dccp_msk(sk); |
3e0fadc5 ACM |
244 | |
245 | /* | |
246 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
247 | * for retransmissions | |
248 | */ | |
249 | if (sk->sk_send_head != NULL) { | |
250 | kfree_skb(sk->sk_send_head); | |
251 | sk->sk_send_head = NULL; | |
252 | } | |
253 | ||
254 | /* Clean up a referenced DCCP bind bucket. */ | |
255 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 256 | inet_put_port(sk); |
3e0fadc5 ACM |
257 | |
258 | kfree(dp->dccps_service_list); | |
259 | dp->dccps_service_list = NULL; | |
260 | ||
410e27a4 | 261 | if (dmsk->dccpms_send_ack_vector) { |
3e0fadc5 ACM |
262 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
263 | dp->dccps_hc_rx_ackvec = NULL; | |
264 | } | |
265 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
266 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
267 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
268 | ||
269 | /* clean up feature negotiation state */ | |
410e27a4 | 270 | dccp_feat_clean(dmsk); |
3e0fadc5 ACM |
271 | } |
272 | ||
273 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
274 | ||
72a3effa | 275 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 276 | { |
67e6b629 ACM |
277 | struct dccp_sock *dp = dccp_sk(sk); |
278 | ||
279 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
72a3effa | 280 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
281 | } |
282 | ||
ce865a61 GR |
283 | static inline int dccp_need_reset(int state) |
284 | { | |
285 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
286 | state != DCCP_REQUESTING; | |
287 | } | |
288 | ||
7c657876 ACM |
289 | int dccp_disconnect(struct sock *sk, int flags) |
290 | { | |
291 | struct inet_connection_sock *icsk = inet_csk(sk); | |
292 | struct inet_sock *inet = inet_sk(sk); | |
293 | int err = 0; | |
294 | const int old_state = sk->sk_state; | |
295 | ||
296 | if (old_state != DCCP_CLOSED) | |
297 | dccp_set_state(sk, DCCP_CLOSED); | |
298 | ||
ce865a61 GR |
299 | /* |
300 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
301 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
302 | */ | |
7c657876 ACM |
303 | if (old_state == DCCP_LISTEN) { |
304 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
305 | } else if (dccp_need_reset(old_state)) { |
306 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
307 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
308 | } else if (old_state == DCCP_REQUESTING) |
309 | sk->sk_err = ECONNRESET; | |
310 | ||
311 | dccp_clear_xmit_timers(sk); | |
48816322 | 312 | |
7c657876 | 313 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 314 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
315 | if (sk->sk_send_head != NULL) { |
316 | __kfree_skb(sk->sk_send_head); | |
317 | sk->sk_send_head = NULL; | |
318 | } | |
319 | ||
320 | inet->dport = 0; | |
321 | ||
322 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
323 | inet_reset_saddr(sk); | |
324 | ||
325 | sk->sk_shutdown = 0; | |
326 | sock_reset_flag(sk, SOCK_DONE); | |
327 | ||
328 | icsk->icsk_backoff = 0; | |
329 | inet_csk_delack_init(sk); | |
330 | __sk_dst_reset(sk); | |
331 | ||
547b792c | 332 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
7c657876 ACM |
333 | |
334 | sk->sk_error_report(sk); | |
335 | return err; | |
336 | } | |
337 | ||
f21e68ca ACM |
338 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
339 | ||
331968bd ACM |
340 | /* |
341 | * Wait for a DCCP event. | |
342 | * | |
343 | * Note that we don't need to lock the socket, as the upper poll layers | |
344 | * take care of normal races (between the test and the event) and we don't | |
345 | * go look at any of the socket buffers directly. | |
346 | */ | |
f21e68ca ACM |
347 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
348 | poll_table *wait) | |
331968bd ACM |
349 | { |
350 | unsigned int mask; | |
351 | struct sock *sk = sock->sk; | |
352 | ||
353 | poll_wait(file, sk->sk_sleep, wait); | |
354 | if (sk->sk_state == DCCP_LISTEN) | |
355 | return inet_csk_listen_poll(sk); | |
356 | ||
357 | /* Socket is not locked. We are protected from async events | |
358 | by poll logic and correct handling of state changes | |
359 | made by another threads is impossible in any case. | |
360 | */ | |
361 | ||
362 | mask = 0; | |
363 | if (sk->sk_err) | |
364 | mask = POLLERR; | |
365 | ||
366 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
367 | mask |= POLLHUP; | |
368 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 369 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
370 | |
371 | /* Connected? */ | |
372 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
373 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
374 | mask |= POLLIN | POLLRDNORM; | |
375 | ||
376 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
377 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
378 | mask |= POLLOUT | POLLWRNORM; | |
379 | } else { /* send SIGIO later */ | |
380 | set_bit(SOCK_ASYNC_NOSPACE, | |
381 | &sk->sk_socket->flags); | |
382 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
383 | ||
384 | /* Race breaker. If space is freed after | |
385 | * wspace test but before the flags are set, | |
386 | * IO signal will be lost. | |
387 | */ | |
388 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
389 | mask |= POLLOUT | POLLWRNORM; | |
390 | } | |
391 | } | |
392 | } | |
393 | return mask; | |
394 | } | |
395 | ||
f21e68ca ACM |
396 | EXPORT_SYMBOL_GPL(dccp_poll); |
397 | ||
7c657876 ACM |
398 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
399 | { | |
6273172e ACM |
400 | int rc = -ENOTCONN; |
401 | ||
402 | lock_sock(sk); | |
403 | ||
404 | if (sk->sk_state == DCCP_LISTEN) | |
405 | goto out; | |
406 | ||
407 | switch (cmd) { | |
408 | case SIOCINQ: { | |
409 | struct sk_buff *skb; | |
410 | unsigned long amount = 0; | |
411 | ||
412 | skb = skb_peek(&sk->sk_receive_queue); | |
413 | if (skb != NULL) { | |
414 | /* | |
415 | * We will only return the amount of this packet since | |
416 | * that is all that will be read. | |
417 | */ | |
418 | amount = skb->len; | |
419 | } | |
420 | rc = put_user(amount, (int __user *)arg); | |
421 | } | |
422 | break; | |
423 | default: | |
424 | rc = -ENOIOCTLCMD; | |
425 | break; | |
426 | } | |
427 | out: | |
428 | release_sock(sk); | |
429 | return rc; | |
7c657876 ACM |
430 | } |
431 | ||
f21e68ca ACM |
432 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
433 | ||
60fe62e7 | 434 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
67e6b629 ACM |
435 | char __user *optval, int optlen) |
436 | { | |
437 | struct dccp_sock *dp = dccp_sk(sk); | |
438 | struct dccp_service_list *sl = NULL; | |
439 | ||
8109b02b | 440 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
441 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
442 | return -EINVAL; | |
443 | ||
444 | if (optlen > sizeof(service)) { | |
445 | sl = kmalloc(optlen, GFP_KERNEL); | |
446 | if (sl == NULL) | |
447 | return -ENOMEM; | |
448 | ||
449 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
450 | if (copy_from_user(sl->dccpsl_list, | |
451 | optval + sizeof(service), | |
452 | optlen - sizeof(service)) || | |
453 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
454 | kfree(sl); | |
455 | return -EFAULT; | |
456 | } | |
457 | } | |
458 | ||
459 | lock_sock(sk); | |
460 | dp->dccps_service = service; | |
461 | ||
a51482bd | 462 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
463 | |
464 | dp->dccps_service_list = sl; | |
465 | release_sock(sk); | |
466 | return 0; | |
467 | } | |
468 | ||
410e27a4 GR |
469 | /* byte 1 is feature. the rest is the preference list */ |
470 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
471 | struct dccp_so_feat __user *optval) | |
20f41eee | 472 | { |
410e27a4 GR |
473 | struct dccp_so_feat opt; |
474 | u8 *val; | |
475 | int rc; | |
20f41eee | 476 | |
410e27a4 GR |
477 | if (copy_from_user(&opt, optval, sizeof(opt))) |
478 | return -EFAULT; | |
20f41eee | 479 | /* |
410e27a4 | 480 | * rfc4340: 6.1. Change Options |
20f41eee | 481 | */ |
410e27a4 | 482 | if (opt.dccpsf_len < 1) |
fade756f GR |
483 | return -EINVAL; |
484 | ||
410e27a4 GR |
485 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); |
486 | if (!val) | |
fade756f GR |
487 | return -ENOMEM; |
488 | ||
410e27a4 GR |
489 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { |
490 | rc = -EFAULT; | |
491 | goto out_free_val; | |
fade756f GR |
492 | } |
493 | ||
410e27a4 GR |
494 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
495 | val, opt.dccpsf_len, GFP_KERNEL); | |
496 | if (rc) | |
497 | goto out_free_val; | |
fade756f | 498 | |
410e27a4 GR |
499 | out: |
500 | return rc; | |
fade756f | 501 | |
410e27a4 | 502 | out_free_val: |
fade756f | 503 | kfree(val); |
410e27a4 | 504 | goto out; |
fade756f GR |
505 | } |
506 | ||
3fdadf7d DM |
507 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
508 | char __user *optval, int optlen) | |
7c657876 | 509 | { |
09dbc389 GR |
510 | struct dccp_sock *dp = dccp_sk(sk); |
511 | int val, err = 0; | |
7c657876 | 512 | |
410e27a4 | 513 | if (optlen < sizeof(int)) |
a84ffe43 ACM |
514 | return -EINVAL; |
515 | ||
516 | if (get_user(val, (int __user *)optval)) | |
517 | return -EFAULT; | |
518 | ||
67e6b629 ACM |
519 | if (optname == DCCP_SOCKOPT_SERVICE) |
520 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 521 | |
67e6b629 | 522 | lock_sock(sk); |
a84ffe43 | 523 | switch (optname) { |
410e27a4 GR |
524 | case DCCP_SOCKOPT_PACKET_SIZE: |
525 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
526 | err = 0; | |
527 | break; | |
528 | case DCCP_SOCKOPT_CHANGE_L: | |
529 | if (optlen != sizeof(struct dccp_so_feat)) | |
530 | err = -EINVAL; | |
531 | else | |
532 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
533 | (struct dccp_so_feat __user *) | |
534 | optval); | |
535 | break; | |
536 | case DCCP_SOCKOPT_CHANGE_R: | |
537 | if (optlen != sizeof(struct dccp_so_feat)) | |
538 | err = -EINVAL; | |
539 | else | |
540 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
541 | (struct dccp_so_feat __user *) | |
542 | optval); | |
543 | break; | |
b8599d20 GR |
544 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
545 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
546 | err = -EOPNOTSUPP; | |
547 | else | |
548 | dp->dccps_server_timewait = (val != 0); | |
549 | break; | |
410e27a4 GR |
550 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
551 | if (val < 0 || val > 15) | |
d6da3511 TG |
552 | err = -EINVAL; |
553 | else | |
410e27a4 | 554 | dp->dccps_pcslen = val; |
d6da3511 | 555 | break; |
410e27a4 GR |
556 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ |
557 | if (val < 0 || val > 15) | |
d6da3511 | 558 | err = -EINVAL; |
410e27a4 GR |
559 | else { |
560 | dp->dccps_pcrlen = val; | |
561 | /* FIXME: add feature negotiation, | |
562 | * ChangeL(MinimumChecksumCoverage, val) */ | |
563 | } | |
d6da3511 | 564 | break; |
a84ffe43 ACM |
565 | default: |
566 | err = -ENOPROTOOPT; | |
567 | break; | |
568 | } | |
73bbe095 | 569 | |
410e27a4 | 570 | release_sock(sk); |
a84ffe43 | 571 | return err; |
7c657876 ACM |
572 | } |
573 | ||
3fdadf7d DM |
574 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
575 | char __user *optval, int optlen) | |
576 | { | |
577 | if (level != SOL_DCCP) | |
578 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
579 | optname, optval, | |
580 | optlen); | |
581 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
582 | } | |
543d9cfe | 583 | |
f21e68ca ACM |
584 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
585 | ||
3fdadf7d DM |
586 | #ifdef CONFIG_COMPAT |
587 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 588 | char __user *optval, int optlen) |
3fdadf7d | 589 | { |
dec73ff0 ACM |
590 | if (level != SOL_DCCP) |
591 | return inet_csk_compat_setsockopt(sk, level, optname, | |
592 | optval, optlen); | |
3fdadf7d DM |
593 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
594 | } | |
543d9cfe | 595 | |
3fdadf7d DM |
596 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
597 | #endif | |
598 | ||
67e6b629 | 599 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 600 | __be32 __user *optval, |
67e6b629 ACM |
601 | int __user *optlen) |
602 | { | |
603 | const struct dccp_sock *dp = dccp_sk(sk); | |
604 | const struct dccp_service_list *sl; | |
605 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
606 | ||
607 | lock_sock(sk); | |
67e6b629 ACM |
608 | if ((sl = dp->dccps_service_list) != NULL) { |
609 | slen = sl->dccpsl_nr * sizeof(u32); | |
610 | total_len += slen; | |
611 | } | |
612 | ||
613 | err = -EINVAL; | |
614 | if (total_len > len) | |
615 | goto out; | |
616 | ||
617 | err = 0; | |
618 | if (put_user(total_len, optlen) || | |
619 | put_user(dp->dccps_service, optval) || | |
620 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
621 | err = -EFAULT; | |
622 | out: | |
623 | release_sock(sk); | |
624 | return err; | |
625 | } | |
626 | ||
3fdadf7d | 627 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 628 | char __user *optval, int __user *optlen) |
7c657876 | 629 | { |
a84ffe43 ACM |
630 | struct dccp_sock *dp; |
631 | int val, len; | |
7c657876 | 632 | |
a84ffe43 ACM |
633 | if (get_user(len, optlen)) |
634 | return -EFAULT; | |
635 | ||
39ebc027 | 636 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
637 | return -EINVAL; |
638 | ||
639 | dp = dccp_sk(sk); | |
640 | ||
641 | switch (optname) { | |
642 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 643 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 644 | return 0; |
88f964db ACM |
645 | case DCCP_SOCKOPT_SERVICE: |
646 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 647 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
648 | case DCCP_SOCKOPT_GET_CUR_MPS: |
649 | val = dp->dccps_mss_cache; | |
7c559a9e | 650 | break; |
b8599d20 GR |
651 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
652 | val = dp->dccps_server_timewait; | |
b8599d20 | 653 | break; |
6f4e5fff GR |
654 | case DCCP_SOCKOPT_SEND_CSCOV: |
655 | val = dp->dccps_pcslen; | |
656 | break; | |
657 | case DCCP_SOCKOPT_RECV_CSCOV: | |
658 | val = dp->dccps_pcrlen; | |
659 | break; | |
88f964db ACM |
660 | case 128 ... 191: |
661 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
662 | len, (u32 __user *)optval, optlen); | |
663 | case 192 ... 255: | |
664 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
665 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
666 | default: |
667 | return -ENOPROTOOPT; | |
668 | } | |
669 | ||
79133506 | 670 | len = sizeof(val); |
a84ffe43 ACM |
671 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
672 | return -EFAULT; | |
673 | ||
674 | return 0; | |
7c657876 ACM |
675 | } |
676 | ||
3fdadf7d DM |
677 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
678 | char __user *optval, int __user *optlen) | |
679 | { | |
680 | if (level != SOL_DCCP) | |
681 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
682 | optname, optval, | |
683 | optlen); | |
684 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
685 | } | |
543d9cfe | 686 | |
f21e68ca ACM |
687 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
688 | ||
3fdadf7d DM |
689 | #ifdef CONFIG_COMPAT |
690 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 691 | char __user *optval, int __user *optlen) |
3fdadf7d | 692 | { |
dec73ff0 ACM |
693 | if (level != SOL_DCCP) |
694 | return inet_csk_compat_getsockopt(sk, level, optname, | |
695 | optval, optlen); | |
3fdadf7d DM |
696 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
697 | } | |
543d9cfe | 698 | |
3fdadf7d DM |
699 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
700 | #endif | |
701 | ||
7c657876 ACM |
702 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
703 | size_t len) | |
704 | { | |
705 | const struct dccp_sock *dp = dccp_sk(sk); | |
706 | const int flags = msg->msg_flags; | |
707 | const int noblock = flags & MSG_DONTWAIT; | |
708 | struct sk_buff *skb; | |
709 | int rc, size; | |
710 | long timeo; | |
711 | ||
712 | if (len > dp->dccps_mss_cache) | |
713 | return -EMSGSIZE; | |
714 | ||
715 | lock_sock(sk); | |
b1308dc0 | 716 | |
410e27a4 GR |
717 | if (sysctl_dccp_tx_qlen && |
718 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { | |
b1308dc0 IM |
719 | rc = -EAGAIN; |
720 | goto out_release; | |
721 | } | |
722 | ||
27258ee5 | 723 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
724 | |
725 | /* | |
726 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
727 | * so that the trick in dccp_rcv_request_sent_state_process. | |
728 | */ | |
729 | /* Wait for a connection to finish. */ | |
cecd8d0e | 730 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 731 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 732 | goto out_release; |
7c657876 ACM |
733 | |
734 | size = sk->sk_prot->max_header + len; | |
735 | release_sock(sk); | |
736 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
737 | lock_sock(sk); | |
7c657876 ACM |
738 | if (skb == NULL) |
739 | goto out_release; | |
740 | ||
741 | skb_reserve(skb, sk->sk_prot->max_header); | |
742 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
743 | if (rc != 0) |
744 | goto out_discard; | |
745 | ||
410e27a4 GR |
746 | skb_queue_tail(&sk->sk_write_queue, skb); |
747 | dccp_write_xmit(sk,0); | |
7c657876 ACM |
748 | out_release: |
749 | release_sock(sk); | |
750 | return rc ? : len; | |
27258ee5 ACM |
751 | out_discard: |
752 | kfree_skb(skb); | |
7c657876 | 753 | goto out_release; |
7c657876 ACM |
754 | } |
755 | ||
f21e68ca ACM |
756 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
757 | ||
7c657876 ACM |
758 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
759 | size_t len, int nonblock, int flags, int *addr_len) | |
760 | { | |
761 | const struct dccp_hdr *dh; | |
7c657876 ACM |
762 | long timeo; |
763 | ||
764 | lock_sock(sk); | |
765 | ||
531669a0 ACM |
766 | if (sk->sk_state == DCCP_LISTEN) { |
767 | len = -ENOTCONN; | |
7c657876 | 768 | goto out; |
7c657876 | 769 | } |
7c657876 | 770 | |
531669a0 | 771 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
772 | |
773 | do { | |
531669a0 | 774 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 775 | |
531669a0 ACM |
776 | if (skb == NULL) |
777 | goto verify_sock_status; | |
7c657876 | 778 | |
531669a0 | 779 | dh = dccp_hdr(skb); |
7c657876 | 780 | |
0c869620 GR |
781 | switch (dh->dccph_type) { |
782 | case DCCP_PKT_DATA: | |
783 | case DCCP_PKT_DATAACK: | |
531669a0 | 784 | goto found_ok_skb; |
7c657876 | 785 | |
0c869620 GR |
786 | case DCCP_PKT_CLOSE: |
787 | case DCCP_PKT_CLOSEREQ: | |
788 | if (!(flags & MSG_PEEK)) | |
789 | dccp_finish_passive_close(sk); | |
790 | /* fall through */ | |
791 | case DCCP_PKT_RESET: | |
792 | dccp_pr_debug("found fin (%s) ok!\n", | |
793 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
794 | len = 0; |
795 | goto found_fin_ok; | |
0c869620 GR |
796 | default: |
797 | dccp_pr_debug("packet_type=%s\n", | |
798 | dccp_packet_name(dh->dccph_type)); | |
799 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 800 | } |
531669a0 ACM |
801 | verify_sock_status: |
802 | if (sock_flag(sk, SOCK_DONE)) { | |
803 | len = 0; | |
7c657876 | 804 | break; |
531669a0 | 805 | } |
7c657876 | 806 | |
531669a0 ACM |
807 | if (sk->sk_err) { |
808 | len = sock_error(sk); | |
809 | break; | |
810 | } | |
7c657876 | 811 | |
531669a0 ACM |
812 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
813 | len = 0; | |
814 | break; | |
815 | } | |
7c657876 | 816 | |
531669a0 ACM |
817 | if (sk->sk_state == DCCP_CLOSED) { |
818 | if (!sock_flag(sk, SOCK_DONE)) { | |
819 | /* This occurs when user tries to read | |
820 | * from never connected socket. | |
821 | */ | |
822 | len = -ENOTCONN; | |
7c657876 ACM |
823 | break; |
824 | } | |
531669a0 ACM |
825 | len = 0; |
826 | break; | |
7c657876 ACM |
827 | } |
828 | ||
531669a0 ACM |
829 | if (!timeo) { |
830 | len = -EAGAIN; | |
831 | break; | |
832 | } | |
7c657876 | 833 | |
531669a0 ACM |
834 | if (signal_pending(current)) { |
835 | len = sock_intr_errno(timeo); | |
836 | break; | |
837 | } | |
7c657876 | 838 | |
531669a0 | 839 | sk_wait_data(sk, &timeo); |
7c657876 | 840 | continue; |
7c657876 | 841 | found_ok_skb: |
531669a0 ACM |
842 | if (len > skb->len) |
843 | len = skb->len; | |
844 | else if (len < skb->len) | |
845 | msg->msg_flags |= MSG_TRUNC; | |
846 | ||
847 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
848 | /* Exception. Bailout! */ | |
849 | len = -EFAULT; | |
850 | break; | |
7c657876 | 851 | } |
7c657876 ACM |
852 | found_fin_ok: |
853 | if (!(flags & MSG_PEEK)) | |
624d1164 | 854 | sk_eat_skb(sk, skb, 0); |
7c657876 | 855 | break; |
531669a0 | 856 | } while (1); |
7c657876 ACM |
857 | out: |
858 | release_sock(sk); | |
531669a0 | 859 | return len; |
7c657876 ACM |
860 | } |
861 | ||
f21e68ca ACM |
862 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
863 | ||
864 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
865 | { |
866 | struct sock *sk = sock->sk; | |
867 | unsigned char old_state; | |
868 | int err; | |
869 | ||
870 | lock_sock(sk); | |
871 | ||
872 | err = -EINVAL; | |
873 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
874 | goto out; | |
875 | ||
876 | old_state = sk->sk_state; | |
877 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
878 | goto out; | |
879 | ||
880 | /* Really, if the socket is already in listen state | |
881 | * we can only allow the backlog to be adjusted. | |
882 | */ | |
883 | if (old_state != DCCP_LISTEN) { | |
884 | /* | |
885 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
886 | * see tcp_listen_start | |
887 | */ | |
72a3effa | 888 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
889 | if (err) |
890 | goto out; | |
891 | } | |
892 | sk->sk_max_ack_backlog = backlog; | |
893 | err = 0; | |
894 | ||
895 | out: | |
896 | release_sock(sk); | |
897 | return err; | |
898 | } | |
899 | ||
f21e68ca ACM |
900 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
901 | ||
0c869620 | 902 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 903 | { |
0c869620 | 904 | u8 next_state = DCCP_CLOSED; |
7c657876 | 905 | |
0c869620 GR |
906 | switch (sk->sk_state) { |
907 | case DCCP_PASSIVE_CLOSE: | |
908 | case DCCP_PASSIVE_CLOSEREQ: | |
909 | dccp_finish_passive_close(sk); | |
910 | break; | |
911 | case DCCP_PARTOPEN: | |
912 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
913 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
914 | /* fall through */ | |
915 | case DCCP_OPEN: | |
916 | dccp_send_close(sk, 1); | |
7c657876 | 917 | |
b8599d20 GR |
918 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
919 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
920 | next_state = DCCP_ACTIVE_CLOSEREQ; |
921 | else | |
922 | next_state = DCCP_CLOSING; | |
923 | /* fall through */ | |
924 | default: | |
925 | dccp_set_state(sk, next_state); | |
926 | } | |
7c657876 ACM |
927 | } |
928 | ||
929 | void dccp_close(struct sock *sk, long timeout) | |
930 | { | |
97e5848d | 931 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 932 | struct sk_buff *skb; |
d83bd95b | 933 | u32 data_was_unread = 0; |
134af346 | 934 | int state; |
7c657876 ACM |
935 | |
936 | lock_sock(sk); | |
937 | ||
938 | sk->sk_shutdown = SHUTDOWN_MASK; | |
939 | ||
940 | if (sk->sk_state == DCCP_LISTEN) { | |
941 | dccp_set_state(sk, DCCP_CLOSED); | |
942 | ||
943 | /* Special case. */ | |
944 | inet_csk_listen_stop(sk); | |
945 | ||
946 | goto adjudge_to_death; | |
947 | } | |
948 | ||
97e5848d IM |
949 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
950 | ||
7c657876 ACM |
951 | /* |
952 | * We need to flush the recv. buffs. We do this only on the | |
953 | * descriptor close, not protocol-sourced closes, because the | |
954 | *reader process may not have drained the data yet! | |
955 | */ | |
7c657876 | 956 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 957 | data_was_unread += skb->len; |
7c657876 ACM |
958 | __kfree_skb(skb); |
959 | } | |
960 | ||
d83bd95b GR |
961 | if (data_was_unread) { |
962 | /* Unread data was tossed, send an appropriate Reset Code */ | |
963 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); | |
964 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
965 | dccp_set_state(sk, DCCP_CLOSED); | |
966 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
967 | /* Check zero linger _after_ checking for unread data. */ |
968 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 GR |
969 | } else if (sk->sk_state != DCCP_CLOSED) { |
970 | dccp_terminate_connection(sk); | |
7c657876 ACM |
971 | } |
972 | ||
973 | sk_stream_wait_close(sk, timeout); | |
974 | ||
975 | adjudge_to_death: | |
134af346 HX |
976 | state = sk->sk_state; |
977 | sock_hold(sk); | |
978 | sock_orphan(sk); | |
979 | atomic_inc(sk->sk_prot->orphan_count); | |
980 | ||
7ad07e7c ACM |
981 | /* |
982 | * It is the last release_sock in its life. It will remove backlog. | |
983 | */ | |
7c657876 ACM |
984 | release_sock(sk); |
985 | /* | |
986 | * Now socket is owned by kernel and we acquire BH lock | |
987 | * to finish close. No need to check for user refs. | |
988 | */ | |
989 | local_bh_disable(); | |
990 | bh_lock_sock(sk); | |
547b792c | 991 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 992 | |
134af346 HX |
993 | /* Have we already been destroyed by a softirq or backlog? */ |
994 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
995 | goto out; | |
7ad07e7c | 996 | |
7c657876 ACM |
997 | if (sk->sk_state == DCCP_CLOSED) |
998 | inet_csk_destroy_sock(sk); | |
999 | ||
1000 | /* Otherwise, socket is reprieved until protocol close. */ | |
1001 | ||
134af346 | 1002 | out: |
7c657876 ACM |
1003 | bh_unlock_sock(sk); |
1004 | local_bh_enable(); | |
1005 | sock_put(sk); | |
1006 | } | |
1007 | ||
f21e68ca ACM |
1008 | EXPORT_SYMBOL_GPL(dccp_close); |
1009 | ||
7c657876 ACM |
1010 | void dccp_shutdown(struct sock *sk, int how) |
1011 | { | |
8e8c71f1 | 1012 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1013 | } |
1014 | ||
f21e68ca ACM |
1015 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1016 | ||
24e8b7e4 | 1017 | static inline int dccp_mib_init(void) |
7c657876 | 1018 | { |
24e8b7e4 | 1019 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
7c657876 ACM |
1020 | } |
1021 | ||
24e8b7e4 | 1022 | static inline void dccp_mib_exit(void) |
46f09ffa | 1023 | { |
24e8b7e4 | 1024 | snmp_mib_free((void**)dccp_statistics); |
46f09ffa ACM |
1025 | } |
1026 | ||
7c657876 ACM |
1027 | static int thash_entries; |
1028 | module_param(thash_entries, int, 0444); | |
1029 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1030 | ||
a1d3a355 | 1031 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1032 | int dccp_debug; |
43264991 | 1033 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1034 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1035 | |
1036 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1037 | #endif |
7c657876 ACM |
1038 | |
1039 | static int __init dccp_init(void) | |
1040 | { | |
1041 | unsigned long goal; | |
1042 | int ehash_order, bhash_order, i; | |
b61fafc4 | 1043 | int rc = -ENOBUFS; |
7c657876 | 1044 | |
028b0275 PM |
1045 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1046 | FIELD_SIZEOF(struct sk_buff, cb)); | |
1047 | ||
7690af3f ACM |
1048 | dccp_hashinfo.bind_bucket_cachep = |
1049 | kmem_cache_create("dccp_bind_bucket", | |
1050 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1051 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1052 | if (!dccp_hashinfo.bind_bucket_cachep) |
b61fafc4 | 1053 | goto out; |
7c657876 ACM |
1054 | |
1055 | /* | |
1056 | * Size and allocate the main established and bind bucket | |
1057 | * hash tables. | |
1058 | * | |
1059 | * The methodology is similar to that of the buffer cache. | |
1060 | */ | |
1061 | if (num_physpages >= (128 * 1024)) | |
1062 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
1063 | else | |
1064 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
1065 | ||
1066 | if (thash_entries) | |
7690af3f ACM |
1067 | goal = (thash_entries * |
1068 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1069 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1070 | ; | |
1071 | do { | |
1072 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
1073 | sizeof(struct inet_ehash_bucket); | |
7690af3f ACM |
1074 | while (dccp_hashinfo.ehash_size & |
1075 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
1076 | dccp_hashinfo.ehash_size--; |
1077 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
1078 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
1079 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
1080 | ||
1081 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1082 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1083 | goto out_free_bind_bucket_cachep; |
1084 | } | |
1085 | ||
dbca9b27 | 1086 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
7c657876 | 1087 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
dbca9b27 | 1088 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
7c657876 ACM |
1089 | } |
1090 | ||
230140cf ED |
1091 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1092 | goto out_free_dccp_ehash; | |
1093 | ||
7c657876 ACM |
1094 | bhash_order = ehash_order; |
1095 | ||
1096 | do { | |
1097 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1098 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1099 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1100 | bhash_order > 0) | |
7c657876 ACM |
1101 | continue; |
1102 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1103 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
1104 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
1105 | ||
1106 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1107 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1108 | goto out_free_dccp_locks; |
7c657876 ACM |
1109 | } |
1110 | ||
1111 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1112 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1113 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1114 | } | |
1115 | ||
46f09ffa | 1116 | rc = dccp_mib_init(); |
fa23e2ec | 1117 | if (rc) |
7c657876 ACM |
1118 | goto out_free_dccp_bhash; |
1119 | ||
9b07ef5d | 1120 | rc = dccp_ackvec_init(); |
7c657876 | 1121 | if (rc) |
b61fafc4 | 1122 | goto out_free_dccp_mib; |
9b07ef5d | 1123 | |
e55d912f | 1124 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1125 | if (rc) |
1126 | goto out_ackvec_exit; | |
4c70f383 GR |
1127 | |
1128 | dccp_timestamping_init(); | |
7c657876 ACM |
1129 | out: |
1130 | return rc; | |
9b07ef5d ACM |
1131 | out_ackvec_exit: |
1132 | dccp_ackvec_exit(); | |
b61fafc4 | 1133 | out_free_dccp_mib: |
46f09ffa | 1134 | dccp_mib_exit(); |
7c657876 ACM |
1135 | out_free_dccp_bhash: |
1136 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
1137 | dccp_hashinfo.bhash = NULL; | |
230140cf ED |
1138 | out_free_dccp_locks: |
1139 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1140 | out_free_dccp_ehash: |
1141 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
1142 | dccp_hashinfo.ehash = NULL; | |
1143 | out_free_bind_bucket_cachep: | |
1144 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
1145 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
7c657876 ACM |
1146 | goto out; |
1147 | } | |
1148 | ||
7c657876 ACM |
1149 | static void __exit dccp_fini(void) |
1150 | { | |
46f09ffa | 1151 | dccp_mib_exit(); |
725ba8ee ACM |
1152 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1153 | get_order(dccp_hashinfo.bhash_size * | |
1154 | sizeof(struct inet_bind_hashbucket))); | |
1155 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
1156 | get_order(dccp_hashinfo.ehash_size * | |
1157 | sizeof(struct inet_ehash_bucket))); | |
230140cf | 1158 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1159 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1160 | dccp_ackvec_exit(); |
e55d912f | 1161 | dccp_sysctl_exit(); |
7c657876 ACM |
1162 | } |
1163 | ||
1164 | module_init(dccp_init); | |
1165 | module_exit(dccp_fini); | |
1166 | ||
7c657876 ACM |
1167 | MODULE_LICENSE("GPL"); |
1168 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1169 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |