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Commit | Line | Data |
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7c657876 ACM |
1 | /* |
2 | * net/dccp/proto.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
7c657876 ACM |
12 | #include <linux/dccp.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/if_arp.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/random.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
7c657876 ACM |
24 | #include <net/checksum.h> |
25 | ||
14c85021 | 26 | #include <net/inet_sock.h> |
120e9dab | 27 | #include <net/inet_common.h> |
7c657876 ACM |
28 | #include <net/sock.h> |
29 | #include <net/xfrm.h> | |
30 | ||
6273172e | 31 | #include <asm/ioctls.h> |
7c657876 ACM |
32 | #include <linux/spinlock.h> |
33 | #include <linux/timer.h> | |
34 | #include <linux/delay.h> | |
35 | #include <linux/poll.h> | |
7c657876 ACM |
36 | |
37 | #include "ccid.h" | |
38 | #include "dccp.h" | |
afe00251 | 39 | #include "feat.h" |
7c657876 | 40 | |
ee549be6 MH |
41 | #define CREATE_TRACE_POINTS |
42 | #include "trace.h" | |
43 | ||
ba89966c | 44 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 | 45 | |
f21e68ca ACM |
46 | EXPORT_SYMBOL_GPL(dccp_statistics); |
47 | ||
dd24c001 | 48 | struct percpu_counter dccp_orphan_count; |
f21e68ca ACM |
49 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
50 | ||
5caea4ea | 51 | struct inet_hashinfo dccp_hashinfo; |
075ae866 ACM |
52 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
53 | ||
b1308dc0 IM |
54 | /* the maximum queue length for tx in packets. 0 is no limit */ |
55 | int sysctl_dccp_tx_qlen __read_mostly = 5; | |
56 | ||
1f4f0f64 | 57 | #ifdef CONFIG_IP_DCCP_DEBUG |
58 | static const char *dccp_state_name(const int state) | |
59 | { | |
60 | static const char *const dccp_state_names[] = { | |
61 | [DCCP_OPEN] = "OPEN", | |
62 | [DCCP_REQUESTING] = "REQUESTING", | |
63 | [DCCP_PARTOPEN] = "PARTOPEN", | |
64 | [DCCP_LISTEN] = "LISTEN", | |
65 | [DCCP_RESPOND] = "RESPOND", | |
66 | [DCCP_CLOSING] = "CLOSING", | |
67 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
68 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
69 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
70 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
71 | [DCCP_CLOSED] = "CLOSED", | |
72 | }; | |
73 | ||
74 | if (state >= DCCP_MAX_STATES) | |
75 | return "INVALID STATE!"; | |
76 | else | |
77 | return dccp_state_names[state]; | |
78 | } | |
79 | #endif | |
80 | ||
c25a18ba ACM |
81 | void dccp_set_state(struct sock *sk, const int state) |
82 | { | |
83 | const int oldstate = sk->sk_state; | |
84 | ||
f11135a3 | 85 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
c25a18ba ACM |
86 | dccp_state_name(oldstate), dccp_state_name(state)); |
87 | WARN_ON(state == oldstate); | |
88 | ||
89 | switch (state) { | |
90 | case DCCP_OPEN: | |
91 | if (oldstate != DCCP_OPEN) | |
92 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
6eb55d17 GR |
93 | /* Client retransmits all Confirm options until entering OPEN */ |
94 | if (oldstate == DCCP_PARTOPEN) | |
95 | dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); | |
c25a18ba ACM |
96 | break; |
97 | ||
98 | case DCCP_CLOSED: | |
0c869620 GR |
99 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
100 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
101 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
102 | ||
103 | sk->sk_prot->unhash(sk); | |
104 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
105 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 106 | inet_put_port(sk); |
c25a18ba ACM |
107 | /* fall through */ |
108 | default: | |
109 | if (oldstate == DCCP_OPEN) | |
110 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
111 | } | |
112 | ||
113 | /* Change state AFTER socket is unhashed to avoid closed | |
114 | * socket sitting in hash tables. | |
115 | */ | |
b0832e30 | 116 | inet_sk_set_state(sk, state); |
c25a18ba ACM |
117 | } |
118 | ||
119 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
120 | ||
0c869620 GR |
121 | static void dccp_finish_passive_close(struct sock *sk) |
122 | { | |
123 | switch (sk->sk_state) { | |
124 | case DCCP_PASSIVE_CLOSE: | |
125 | /* Node (client or server) has received Close packet. */ | |
126 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
127 | dccp_set_state(sk, DCCP_CLOSED); | |
128 | break; | |
129 | case DCCP_PASSIVE_CLOSEREQ: | |
130 | /* | |
131 | * Client received CloseReq. We set the `active' flag so that | |
132 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
133 | */ | |
134 | dccp_send_close(sk, 1); | |
135 | dccp_set_state(sk, DCCP_CLOSING); | |
136 | } | |
137 | } | |
138 | ||
c25a18ba ACM |
139 | void dccp_done(struct sock *sk) |
140 | { | |
141 | dccp_set_state(sk, DCCP_CLOSED); | |
142 | dccp_clear_xmit_timers(sk); | |
143 | ||
144 | sk->sk_shutdown = SHUTDOWN_MASK; | |
145 | ||
146 | if (!sock_flag(sk, SOCK_DEAD)) | |
147 | sk->sk_state_change(sk); | |
148 | else | |
149 | inet_csk_destroy_sock(sk); | |
150 | } | |
151 | ||
152 | EXPORT_SYMBOL_GPL(dccp_done); | |
153 | ||
7c657876 ACM |
154 | const char *dccp_packet_name(const int type) |
155 | { | |
36cbd3dc | 156 | static const char *const dccp_packet_names[] = { |
7c657876 ACM |
157 | [DCCP_PKT_REQUEST] = "REQUEST", |
158 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
159 | [DCCP_PKT_DATA] = "DATA", | |
160 | [DCCP_PKT_ACK] = "ACK", | |
161 | [DCCP_PKT_DATAACK] = "DATAACK", | |
162 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
163 | [DCCP_PKT_CLOSE] = "CLOSE", | |
164 | [DCCP_PKT_RESET] = "RESET", | |
165 | [DCCP_PKT_SYNC] = "SYNC", | |
166 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
167 | }; | |
168 | ||
169 | if (type >= DCCP_NR_PKT_TYPES) | |
170 | return "INVALID"; | |
171 | else | |
172 | return dccp_packet_names[type]; | |
173 | } | |
174 | ||
175 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
176 | ||
120e9dab ED |
177 | static void dccp_sk_destruct(struct sock *sk) |
178 | { | |
179 | struct dccp_sock *dp = dccp_sk(sk); | |
180 | ||
181 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
182 | dp->dccps_hc_tx_ccid = NULL; | |
183 | inet_sock_destruct(sk); | |
184 | } | |
185 | ||
72478873 | 186 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
187 | { |
188 | struct dccp_sock *dp = dccp_sk(sk); | |
189 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3e0fadc5 | 190 | |
e18d7a98 ACM |
191 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
192 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
193 | sk->sk_state = DCCP_CLOSED; | |
194 | sk->sk_write_space = dccp_write_space; | |
120e9dab | 195 | sk->sk_destruct = dccp_sk_destruct; |
e18d7a98 | 196 | icsk->icsk_sync_mss = dccp_sync_mss; |
410e27a4 | 197 | dp->dccps_mss_cache = 536; |
e18d7a98 ACM |
198 | dp->dccps_rate_last = jiffies; |
199 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
200 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
871a2c16 | 201 | dp->dccps_tx_qlen = sysctl_dccp_tx_qlen; |
e18d7a98 ACM |
202 | |
203 | dccp_init_xmit_timers(sk); | |
204 | ||
ac75773c | 205 | INIT_LIST_HEAD(&dp->dccps_featneg); |
6eb55d17 GR |
206 | /* control socket doesn't need feat nego */ |
207 | if (likely(ctl_sock_initialized)) | |
208 | return dccp_feat_init(sk); | |
3e0fadc5 ACM |
209 | return 0; |
210 | } | |
211 | ||
212 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
213 | ||
7d06b2e0 | 214 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
215 | { |
216 | struct dccp_sock *dp = dccp_sk(sk); | |
217 | ||
7749d4ff | 218 | __skb_queue_purge(&sk->sk_write_queue); |
3e0fadc5 ACM |
219 | if (sk->sk_send_head != NULL) { |
220 | kfree_skb(sk->sk_send_head); | |
221 | sk->sk_send_head = NULL; | |
222 | } | |
223 | ||
224 | /* Clean up a referenced DCCP bind bucket. */ | |
225 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 226 | inet_put_port(sk); |
3e0fadc5 ACM |
227 | |
228 | kfree(dp->dccps_service_list); | |
229 | dp->dccps_service_list = NULL; | |
230 | ||
6fdd34d4 | 231 | if (dp->dccps_hc_rx_ackvec != NULL) { |
3e0fadc5 ACM |
232 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
233 | dp->dccps_hc_rx_ackvec = NULL; | |
234 | } | |
235 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
120e9dab | 236 | dp->dccps_hc_rx_ccid = NULL; |
3e0fadc5 ACM |
237 | |
238 | /* clean up feature negotiation state */ | |
d99a7bd2 | 239 | dccp_feat_list_purge(&dp->dccps_featneg); |
3e0fadc5 ACM |
240 | } |
241 | ||
242 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
243 | ||
72a3effa | 244 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 245 | { |
67e6b629 ACM |
246 | struct dccp_sock *dp = dccp_sk(sk); |
247 | ||
248 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
9eca0a47 GR |
249 | /* do not start to listen if feature negotiation setup fails */ |
250 | if (dccp_feat_finalise_settings(dp)) | |
251 | return -EPROTO; | |
72a3effa | 252 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
253 | } |
254 | ||
ce865a61 GR |
255 | static inline int dccp_need_reset(int state) |
256 | { | |
257 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
258 | state != DCCP_REQUESTING; | |
259 | } | |
260 | ||
7c657876 ACM |
261 | int dccp_disconnect(struct sock *sk, int flags) |
262 | { | |
263 | struct inet_connection_sock *icsk = inet_csk(sk); | |
264 | struct inet_sock *inet = inet_sk(sk); | |
69c64866 | 265 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 ACM |
266 | int err = 0; |
267 | const int old_state = sk->sk_state; | |
268 | ||
269 | if (old_state != DCCP_CLOSED) | |
270 | dccp_set_state(sk, DCCP_CLOSED); | |
271 | ||
ce865a61 GR |
272 | /* |
273 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
274 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
275 | */ | |
7c657876 ACM |
276 | if (old_state == DCCP_LISTEN) { |
277 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
278 | } else if (dccp_need_reset(old_state)) { |
279 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
280 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
281 | } else if (old_state == DCCP_REQUESTING) |
282 | sk->sk_err = ECONNRESET; | |
283 | ||
284 | dccp_clear_xmit_timers(sk); | |
69c64866 MG |
285 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
286 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
287 | dp->dccps_hc_rx_ccid = NULL; | |
288 | dp->dccps_hc_tx_ccid = NULL; | |
48816322 | 289 | |
7c657876 | 290 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 291 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
292 | if (sk->sk_send_head != NULL) { |
293 | __kfree_skb(sk->sk_send_head); | |
294 | sk->sk_send_head = NULL; | |
295 | } | |
296 | ||
c720c7e8 | 297 | inet->inet_dport = 0; |
7c657876 ACM |
298 | |
299 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
300 | inet_reset_saddr(sk); | |
301 | ||
302 | sk->sk_shutdown = 0; | |
303 | sock_reset_flag(sk, SOCK_DONE); | |
304 | ||
305 | icsk->icsk_backoff = 0; | |
306 | inet_csk_delack_init(sk); | |
307 | __sk_dst_reset(sk); | |
308 | ||
c720c7e8 | 309 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
7c657876 ACM |
310 | |
311 | sk->sk_error_report(sk); | |
312 | return err; | |
313 | } | |
314 | ||
f21e68ca ACM |
315 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
316 | ||
331968bd ACM |
317 | /* |
318 | * Wait for a DCCP event. | |
319 | * | |
320 | * Note that we don't need to lock the socket, as the upper poll layers | |
321 | * take care of normal races (between the test and the event) and we don't | |
322 | * go look at any of the socket buffers directly. | |
323 | */ | |
ade994f4 | 324 | __poll_t dccp_poll(struct file *file, struct socket *sock, |
f21e68ca | 325 | poll_table *wait) |
331968bd | 326 | { |
ade994f4 | 327 | __poll_t mask; |
331968bd ACM |
328 | struct sock *sk = sock->sk; |
329 | ||
aa395145 | 330 | sock_poll_wait(file, sk_sleep(sk), wait); |
331968bd ACM |
331 | if (sk->sk_state == DCCP_LISTEN) |
332 | return inet_csk_listen_poll(sk); | |
333 | ||
334 | /* Socket is not locked. We are protected from async events | |
335 | by poll logic and correct handling of state changes | |
336 | made by another threads is impossible in any case. | |
337 | */ | |
338 | ||
339 | mask = 0; | |
340 | if (sk->sk_err) | |
a9a08845 | 341 | mask = EPOLLERR; |
331968bd ACM |
342 | |
343 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
a9a08845 | 344 | mask |= EPOLLHUP; |
331968bd | 345 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 346 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
331968bd ACM |
347 | |
348 | /* Connected? */ | |
349 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
350 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
a9a08845 | 351 | mask |= EPOLLIN | EPOLLRDNORM; |
331968bd ACM |
352 | |
353 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
64dc6130 | 354 | if (sk_stream_is_writeable(sk)) { |
a9a08845 | 355 | mask |= EPOLLOUT | EPOLLWRNORM; |
331968bd | 356 | } else { /* send SIGIO later */ |
9cd3e072 | 357 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
331968bd ACM |
358 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
359 | ||
360 | /* Race breaker. If space is freed after | |
361 | * wspace test but before the flags are set, | |
362 | * IO signal will be lost. | |
363 | */ | |
64dc6130 | 364 | if (sk_stream_is_writeable(sk)) |
a9a08845 | 365 | mask |= EPOLLOUT | EPOLLWRNORM; |
331968bd ACM |
366 | } |
367 | } | |
368 | } | |
369 | return mask; | |
370 | } | |
371 | ||
f21e68ca ACM |
372 | EXPORT_SYMBOL_GPL(dccp_poll); |
373 | ||
7c657876 ACM |
374 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
375 | { | |
6273172e ACM |
376 | int rc = -ENOTCONN; |
377 | ||
378 | lock_sock(sk); | |
379 | ||
380 | if (sk->sk_state == DCCP_LISTEN) | |
381 | goto out; | |
382 | ||
383 | switch (cmd) { | |
384 | case SIOCINQ: { | |
385 | struct sk_buff *skb; | |
386 | unsigned long amount = 0; | |
387 | ||
388 | skb = skb_peek(&sk->sk_receive_queue); | |
389 | if (skb != NULL) { | |
390 | /* | |
391 | * We will only return the amount of this packet since | |
392 | * that is all that will be read. | |
393 | */ | |
394 | amount = skb->len; | |
395 | } | |
396 | rc = put_user(amount, (int __user *)arg); | |
397 | } | |
398 | break; | |
399 | default: | |
400 | rc = -ENOIOCTLCMD; | |
401 | break; | |
402 | } | |
403 | out: | |
404 | release_sock(sk); | |
405 | return rc; | |
7c657876 ACM |
406 | } |
407 | ||
f21e68ca ACM |
408 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
409 | ||
60fe62e7 | 410 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
b7058842 | 411 | char __user *optval, unsigned int optlen) |
67e6b629 ACM |
412 | { |
413 | struct dccp_sock *dp = dccp_sk(sk); | |
414 | struct dccp_service_list *sl = NULL; | |
415 | ||
8109b02b | 416 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
417 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
418 | return -EINVAL; | |
419 | ||
420 | if (optlen > sizeof(service)) { | |
421 | sl = kmalloc(optlen, GFP_KERNEL); | |
422 | if (sl == NULL) | |
423 | return -ENOMEM; | |
424 | ||
425 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
426 | if (copy_from_user(sl->dccpsl_list, | |
427 | optval + sizeof(service), | |
428 | optlen - sizeof(service)) || | |
429 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
430 | kfree(sl); | |
431 | return -EFAULT; | |
432 | } | |
433 | } | |
434 | ||
435 | lock_sock(sk); | |
436 | dp->dccps_service = service; | |
437 | ||
a51482bd | 438 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
439 | |
440 | dp->dccps_service_list = sl; | |
441 | release_sock(sk); | |
442 | return 0; | |
443 | } | |
444 | ||
29450559 GR |
445 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
446 | { | |
447 | u8 *list, len; | |
448 | int i, rc; | |
449 | ||
450 | if (cscov < 0 || cscov > 15) | |
451 | return -EINVAL; | |
452 | /* | |
453 | * Populate a list of permissible values, in the range cscov...15. This | |
454 | * is necessary since feature negotiation of single values only works if | |
455 | * both sides incidentally choose the same value. Since the list starts | |
456 | * lowest-value first, negotiation will pick the smallest shared value. | |
457 | */ | |
458 | if (cscov == 0) | |
459 | return 0; | |
460 | len = 16 - cscov; | |
461 | ||
462 | list = kmalloc(len, GFP_KERNEL); | |
463 | if (list == NULL) | |
464 | return -ENOBUFS; | |
465 | ||
466 | for (i = 0; i < len; i++) | |
467 | list[i] = cscov++; | |
468 | ||
469 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); | |
470 | ||
471 | if (rc == 0) { | |
472 | if (rx) | |
473 | dccp_sk(sk)->dccps_pcrlen = cscov; | |
474 | else | |
475 | dccp_sk(sk)->dccps_pcslen = cscov; | |
476 | } | |
477 | kfree(list); | |
478 | return rc; | |
479 | } | |
480 | ||
b20a9c24 | 481 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
b7058842 | 482 | char __user *optval, unsigned int optlen) |
b20a9c24 GR |
483 | { |
484 | u8 *val; | |
485 | int rc = 0; | |
486 | ||
487 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) | |
488 | return -EINVAL; | |
489 | ||
042604d2 JL |
490 | val = memdup_user(optval, optlen); |
491 | if (IS_ERR(val)) | |
492 | return PTR_ERR(val); | |
b20a9c24 GR |
493 | |
494 | lock_sock(sk); | |
495 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) | |
496 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); | |
497 | ||
498 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) | |
499 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); | |
500 | release_sock(sk); | |
501 | ||
502 | kfree(val); | |
503 | return rc; | |
504 | } | |
505 | ||
3fdadf7d | 506 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 507 | char __user *optval, unsigned int optlen) |
7c657876 | 508 | { |
09dbc389 GR |
509 | struct dccp_sock *dp = dccp_sk(sk); |
510 | int val, err = 0; | |
7c657876 | 511 | |
19102996 GR |
512 | switch (optname) { |
513 | case DCCP_SOCKOPT_PACKET_SIZE: | |
514 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
515 | return 0; | |
516 | case DCCP_SOCKOPT_CHANGE_L: | |
517 | case DCCP_SOCKOPT_CHANGE_R: | |
518 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); | |
519 | return 0; | |
b20a9c24 GR |
520 | case DCCP_SOCKOPT_CCID: |
521 | case DCCP_SOCKOPT_RX_CCID: | |
522 | case DCCP_SOCKOPT_TX_CCID: | |
523 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); | |
19102996 GR |
524 | } |
525 | ||
526 | if (optlen < (int)sizeof(int)) | |
a84ffe43 ACM |
527 | return -EINVAL; |
528 | ||
529 | if (get_user(val, (int __user *)optval)) | |
530 | return -EFAULT; | |
531 | ||
67e6b629 ACM |
532 | if (optname == DCCP_SOCKOPT_SERVICE) |
533 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 534 | |
67e6b629 | 535 | lock_sock(sk); |
a84ffe43 | 536 | switch (optname) { |
b8599d20 GR |
537 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
538 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
539 | err = -EOPNOTSUPP; | |
540 | else | |
541 | dp->dccps_server_timewait = (val != 0); | |
542 | break; | |
29450559 GR |
543 | case DCCP_SOCKOPT_SEND_CSCOV: |
544 | err = dccp_setsockopt_cscov(sk, val, false); | |
d6da3511 | 545 | break; |
29450559 GR |
546 | case DCCP_SOCKOPT_RECV_CSCOV: |
547 | err = dccp_setsockopt_cscov(sk, val, true); | |
d6da3511 | 548 | break; |
871a2c16 TG |
549 | case DCCP_SOCKOPT_QPOLICY_ID: |
550 | if (sk->sk_state != DCCP_CLOSED) | |
551 | err = -EISCONN; | |
552 | else if (val < 0 || val >= DCCPQ_POLICY_MAX) | |
553 | err = -EINVAL; | |
554 | else | |
555 | dp->dccps_qpolicy = val; | |
556 | break; | |
557 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: | |
558 | if (val < 0) | |
559 | err = -EINVAL; | |
560 | else | |
561 | dp->dccps_tx_qlen = val; | |
562 | break; | |
a84ffe43 ACM |
563 | default: |
564 | err = -ENOPROTOOPT; | |
565 | break; | |
566 | } | |
410e27a4 | 567 | release_sock(sk); |
19102996 | 568 | |
a84ffe43 | 569 | return err; |
7c657876 ACM |
570 | } |
571 | ||
3fdadf7d | 572 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 573 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
574 | { |
575 | if (level != SOL_DCCP) | |
576 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
577 | optname, optval, | |
578 | optlen); | |
579 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
580 | } | |
543d9cfe | 581 | |
f21e68ca ACM |
582 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
583 | ||
3fdadf7d DM |
584 | #ifdef CONFIG_COMPAT |
585 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 586 | char __user *optval, unsigned int optlen) |
3fdadf7d | 587 | { |
dec73ff0 ACM |
588 | if (level != SOL_DCCP) |
589 | return inet_csk_compat_setsockopt(sk, level, optname, | |
590 | optval, optlen); | |
3fdadf7d DM |
591 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
592 | } | |
543d9cfe | 593 | |
3fdadf7d DM |
594 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
595 | #endif | |
596 | ||
67e6b629 | 597 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 598 | __be32 __user *optval, |
67e6b629 ACM |
599 | int __user *optlen) |
600 | { | |
601 | const struct dccp_sock *dp = dccp_sk(sk); | |
602 | const struct dccp_service_list *sl; | |
603 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
604 | ||
605 | lock_sock(sk); | |
67e6b629 ACM |
606 | if ((sl = dp->dccps_service_list) != NULL) { |
607 | slen = sl->dccpsl_nr * sizeof(u32); | |
608 | total_len += slen; | |
609 | } | |
610 | ||
611 | err = -EINVAL; | |
612 | if (total_len > len) | |
613 | goto out; | |
614 | ||
615 | err = 0; | |
616 | if (put_user(total_len, optlen) || | |
617 | put_user(dp->dccps_service, optval) || | |
618 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
619 | err = -EFAULT; | |
620 | out: | |
621 | release_sock(sk); | |
622 | return err; | |
623 | } | |
624 | ||
3fdadf7d | 625 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 626 | char __user *optval, int __user *optlen) |
7c657876 | 627 | { |
a84ffe43 ACM |
628 | struct dccp_sock *dp; |
629 | int val, len; | |
7c657876 | 630 | |
a84ffe43 ACM |
631 | if (get_user(len, optlen)) |
632 | return -EFAULT; | |
633 | ||
39ebc027 | 634 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
635 | return -EINVAL; |
636 | ||
637 | dp = dccp_sk(sk); | |
638 | ||
639 | switch (optname) { | |
640 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 641 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 642 | return 0; |
88f964db ACM |
643 | case DCCP_SOCKOPT_SERVICE: |
644 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 645 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
646 | case DCCP_SOCKOPT_GET_CUR_MPS: |
647 | val = dp->dccps_mss_cache; | |
7c559a9e | 648 | break; |
d90ebcbf GR |
649 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
650 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); | |
71c262a3 GR |
651 | case DCCP_SOCKOPT_TX_CCID: |
652 | val = ccid_get_current_tx_ccid(dp); | |
653 | if (val < 0) | |
654 | return -ENOPROTOOPT; | |
655 | break; | |
656 | case DCCP_SOCKOPT_RX_CCID: | |
657 | val = ccid_get_current_rx_ccid(dp); | |
658 | if (val < 0) | |
659 | return -ENOPROTOOPT; | |
660 | break; | |
b8599d20 GR |
661 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
662 | val = dp->dccps_server_timewait; | |
b8599d20 | 663 | break; |
6f4e5fff GR |
664 | case DCCP_SOCKOPT_SEND_CSCOV: |
665 | val = dp->dccps_pcslen; | |
666 | break; | |
667 | case DCCP_SOCKOPT_RECV_CSCOV: | |
668 | val = dp->dccps_pcrlen; | |
669 | break; | |
871a2c16 TG |
670 | case DCCP_SOCKOPT_QPOLICY_ID: |
671 | val = dp->dccps_qpolicy; | |
672 | break; | |
673 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: | |
674 | val = dp->dccps_tx_qlen; | |
675 | break; | |
88f964db ACM |
676 | case 128 ... 191: |
677 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
678 | len, (u32 __user *)optval, optlen); | |
679 | case 192 ... 255: | |
680 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
681 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
682 | default: |
683 | return -ENOPROTOOPT; | |
684 | } | |
685 | ||
79133506 | 686 | len = sizeof(val); |
a84ffe43 ACM |
687 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
688 | return -EFAULT; | |
689 | ||
690 | return 0; | |
7c657876 ACM |
691 | } |
692 | ||
3fdadf7d DM |
693 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
694 | char __user *optval, int __user *optlen) | |
695 | { | |
696 | if (level != SOL_DCCP) | |
697 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
698 | optname, optval, | |
699 | optlen); | |
700 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
701 | } | |
543d9cfe | 702 | |
f21e68ca ACM |
703 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
704 | ||
3fdadf7d DM |
705 | #ifdef CONFIG_COMPAT |
706 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 707 | char __user *optval, int __user *optlen) |
3fdadf7d | 708 | { |
dec73ff0 ACM |
709 | if (level != SOL_DCCP) |
710 | return inet_csk_compat_getsockopt(sk, level, optname, | |
711 | optval, optlen); | |
3fdadf7d DM |
712 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
713 | } | |
543d9cfe | 714 | |
3fdadf7d DM |
715 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
716 | #endif | |
717 | ||
871a2c16 TG |
718 | static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb) |
719 | { | |
f95b414e | 720 | struct cmsghdr *cmsg; |
871a2c16 TG |
721 | |
722 | /* | |
723 | * Assign an (opaque) qpolicy priority value to skb->priority. | |
724 | * | |
725 | * We are overloading this skb field for use with the qpolicy subystem. | |
726 | * The skb->priority is normally used for the SO_PRIORITY option, which | |
727 | * is initialised from sk_priority. Since the assignment of sk_priority | |
728 | * to skb->priority happens later (on layer 3), we overload this field | |
729 | * for use with queueing priorities as long as the skb is on layer 4. | |
730 | * The default priority value (if nothing is set) is 0. | |
731 | */ | |
732 | skb->priority = 0; | |
733 | ||
f95b414e | 734 | for_each_cmsghdr(cmsg, msg) { |
871a2c16 TG |
735 | if (!CMSG_OK(msg, cmsg)) |
736 | return -EINVAL; | |
737 | ||
738 | if (cmsg->cmsg_level != SOL_DCCP) | |
739 | continue; | |
740 | ||
04910265 TG |
741 | if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX && |
742 | !dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type)) | |
743 | return -EINVAL; | |
744 | ||
871a2c16 TG |
745 | switch (cmsg->cmsg_type) { |
746 | case DCCP_SCM_PRIORITY: | |
747 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32))) | |
748 | return -EINVAL; | |
749 | skb->priority = *(__u32 *)CMSG_DATA(cmsg); | |
750 | break; | |
751 | default: | |
752 | return -EINVAL; | |
753 | } | |
754 | } | |
755 | return 0; | |
756 | } | |
757 | ||
1b784140 | 758 | int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
7c657876 ACM |
759 | { |
760 | const struct dccp_sock *dp = dccp_sk(sk); | |
761 | const int flags = msg->msg_flags; | |
762 | const int noblock = flags & MSG_DONTWAIT; | |
763 | struct sk_buff *skb; | |
764 | int rc, size; | |
765 | long timeo; | |
766 | ||
ee549be6 MH |
767 | trace_dccp_probe(sk, len); |
768 | ||
7c657876 ACM |
769 | if (len > dp->dccps_mss_cache) |
770 | return -EMSGSIZE; | |
771 | ||
772 | lock_sock(sk); | |
b1308dc0 | 773 | |
871a2c16 | 774 | if (dccp_qpolicy_full(sk)) { |
b1308dc0 IM |
775 | rc = -EAGAIN; |
776 | goto out_release; | |
777 | } | |
778 | ||
27258ee5 | 779 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
780 | |
781 | /* | |
782 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
783 | * so that the trick in dccp_rcv_request_sent_state_process. | |
784 | */ | |
785 | /* Wait for a connection to finish. */ | |
cecd8d0e | 786 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 787 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 788 | goto out_release; |
7c657876 ACM |
789 | |
790 | size = sk->sk_prot->max_header + len; | |
791 | release_sock(sk); | |
792 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
793 | lock_sock(sk); | |
7c657876 ACM |
794 | if (skb == NULL) |
795 | goto out_release; | |
796 | ||
797 | skb_reserve(skb, sk->sk_prot->max_header); | |
6ce8e9ce | 798 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
27258ee5 ACM |
799 | if (rc != 0) |
800 | goto out_discard; | |
801 | ||
871a2c16 TG |
802 | rc = dccp_msghdr_parse(msg, skb); |
803 | if (rc != 0) | |
804 | goto out_discard; | |
805 | ||
806 | dccp_qpolicy_push(sk, skb); | |
b1fcf55e GR |
807 | /* |
808 | * The xmit_timer is set if the TX CCID is rate-based and will expire | |
809 | * when congestion control permits to release further packets into the | |
810 | * network. Window-based CCIDs do not use this timer. | |
811 | */ | |
812 | if (!timer_pending(&dp->dccps_xmit_timer)) | |
813 | dccp_write_xmit(sk); | |
7c657876 ACM |
814 | out_release: |
815 | release_sock(sk); | |
816 | return rc ? : len; | |
27258ee5 ACM |
817 | out_discard: |
818 | kfree_skb(skb); | |
7c657876 | 819 | goto out_release; |
7c657876 ACM |
820 | } |
821 | ||
f21e68ca ACM |
822 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
823 | ||
1b784140 YX |
824 | int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, |
825 | int flags, int *addr_len) | |
7c657876 ACM |
826 | { |
827 | const struct dccp_hdr *dh; | |
7c657876 ACM |
828 | long timeo; |
829 | ||
830 | lock_sock(sk); | |
831 | ||
531669a0 ACM |
832 | if (sk->sk_state == DCCP_LISTEN) { |
833 | len = -ENOTCONN; | |
7c657876 | 834 | goto out; |
7c657876 | 835 | } |
7c657876 | 836 | |
531669a0 | 837 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
838 | |
839 | do { | |
531669a0 | 840 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 841 | |
531669a0 ACM |
842 | if (skb == NULL) |
843 | goto verify_sock_status; | |
7c657876 | 844 | |
531669a0 | 845 | dh = dccp_hdr(skb); |
7c657876 | 846 | |
0c869620 GR |
847 | switch (dh->dccph_type) { |
848 | case DCCP_PKT_DATA: | |
849 | case DCCP_PKT_DATAACK: | |
531669a0 | 850 | goto found_ok_skb; |
7c657876 | 851 | |
0c869620 GR |
852 | case DCCP_PKT_CLOSE: |
853 | case DCCP_PKT_CLOSEREQ: | |
854 | if (!(flags & MSG_PEEK)) | |
855 | dccp_finish_passive_close(sk); | |
856 | /* fall through */ | |
857 | case DCCP_PKT_RESET: | |
858 | dccp_pr_debug("found fin (%s) ok!\n", | |
859 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
860 | len = 0; |
861 | goto found_fin_ok; | |
0c869620 GR |
862 | default: |
863 | dccp_pr_debug("packet_type=%s\n", | |
864 | dccp_packet_name(dh->dccph_type)); | |
7bced397 | 865 | sk_eat_skb(sk, skb); |
531669a0 | 866 | } |
531669a0 ACM |
867 | verify_sock_status: |
868 | if (sock_flag(sk, SOCK_DONE)) { | |
869 | len = 0; | |
7c657876 | 870 | break; |
531669a0 | 871 | } |
7c657876 | 872 | |
531669a0 ACM |
873 | if (sk->sk_err) { |
874 | len = sock_error(sk); | |
875 | break; | |
876 | } | |
7c657876 | 877 | |
531669a0 ACM |
878 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
879 | len = 0; | |
880 | break; | |
881 | } | |
7c657876 | 882 | |
531669a0 ACM |
883 | if (sk->sk_state == DCCP_CLOSED) { |
884 | if (!sock_flag(sk, SOCK_DONE)) { | |
885 | /* This occurs when user tries to read | |
886 | * from never connected socket. | |
887 | */ | |
888 | len = -ENOTCONN; | |
7c657876 ACM |
889 | break; |
890 | } | |
531669a0 ACM |
891 | len = 0; |
892 | break; | |
7c657876 ACM |
893 | } |
894 | ||
531669a0 ACM |
895 | if (!timeo) { |
896 | len = -EAGAIN; | |
897 | break; | |
898 | } | |
7c657876 | 899 | |
531669a0 ACM |
900 | if (signal_pending(current)) { |
901 | len = sock_intr_errno(timeo); | |
902 | break; | |
903 | } | |
7c657876 | 904 | |
dfbafc99 | 905 | sk_wait_data(sk, &timeo, NULL); |
7c657876 | 906 | continue; |
7c657876 | 907 | found_ok_skb: |
531669a0 ACM |
908 | if (len > skb->len) |
909 | len = skb->len; | |
910 | else if (len < skb->len) | |
911 | msg->msg_flags |= MSG_TRUNC; | |
912 | ||
51f3d02b | 913 | if (skb_copy_datagram_msg(skb, 0, msg, len)) { |
531669a0 ACM |
914 | /* Exception. Bailout! */ |
915 | len = -EFAULT; | |
916 | break; | |
7c657876 | 917 | } |
55d95590 GR |
918 | if (flags & MSG_TRUNC) |
919 | len = skb->len; | |
7c657876 ACM |
920 | found_fin_ok: |
921 | if (!(flags & MSG_PEEK)) | |
7bced397 | 922 | sk_eat_skb(sk, skb); |
7c657876 | 923 | break; |
531669a0 | 924 | } while (1); |
7c657876 ACM |
925 | out: |
926 | release_sock(sk); | |
531669a0 | 927 | return len; |
7c657876 ACM |
928 | } |
929 | ||
f21e68ca ACM |
930 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
931 | ||
932 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
933 | { |
934 | struct sock *sk = sock->sk; | |
935 | unsigned char old_state; | |
936 | int err; | |
937 | ||
938 | lock_sock(sk); | |
939 | ||
940 | err = -EINVAL; | |
941 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
942 | goto out; | |
943 | ||
944 | old_state = sk->sk_state; | |
945 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
946 | goto out; | |
947 | ||
948 | /* Really, if the socket is already in listen state | |
949 | * we can only allow the backlog to be adjusted. | |
950 | */ | |
951 | if (old_state != DCCP_LISTEN) { | |
952 | /* | |
953 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
954 | * see tcp_listen_start | |
955 | */ | |
72a3effa | 956 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
957 | if (err) |
958 | goto out; | |
959 | } | |
960 | sk->sk_max_ack_backlog = backlog; | |
961 | err = 0; | |
962 | ||
963 | out: | |
964 | release_sock(sk); | |
965 | return err; | |
966 | } | |
967 | ||
f21e68ca ACM |
968 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
969 | ||
0c869620 | 970 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 971 | { |
0c869620 | 972 | u8 next_state = DCCP_CLOSED; |
7c657876 | 973 | |
0c869620 GR |
974 | switch (sk->sk_state) { |
975 | case DCCP_PASSIVE_CLOSE: | |
976 | case DCCP_PASSIVE_CLOSEREQ: | |
977 | dccp_finish_passive_close(sk); | |
978 | break; | |
979 | case DCCP_PARTOPEN: | |
980 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
981 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
982 | /* fall through */ | |
983 | case DCCP_OPEN: | |
984 | dccp_send_close(sk, 1); | |
7c657876 | 985 | |
b8599d20 GR |
986 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
987 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
988 | next_state = DCCP_ACTIVE_CLOSEREQ; |
989 | else | |
990 | next_state = DCCP_CLOSING; | |
991 | /* fall through */ | |
992 | default: | |
993 | dccp_set_state(sk, next_state); | |
994 | } | |
7c657876 ACM |
995 | } |
996 | ||
997 | void dccp_close(struct sock *sk, long timeout) | |
998 | { | |
97e5848d | 999 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 1000 | struct sk_buff *skb; |
d83bd95b | 1001 | u32 data_was_unread = 0; |
134af346 | 1002 | int state; |
7c657876 ACM |
1003 | |
1004 | lock_sock(sk); | |
1005 | ||
1006 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1007 | ||
1008 | if (sk->sk_state == DCCP_LISTEN) { | |
1009 | dccp_set_state(sk, DCCP_CLOSED); | |
1010 | ||
1011 | /* Special case. */ | |
1012 | inet_csk_listen_stop(sk); | |
1013 | ||
1014 | goto adjudge_to_death; | |
1015 | } | |
1016 | ||
97e5848d IM |
1017 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
1018 | ||
7c657876 ACM |
1019 | /* |
1020 | * We need to flush the recv. buffs. We do this only on the | |
1021 | * descriptor close, not protocol-sourced closes, because the | |
1022 | *reader process may not have drained the data yet! | |
1023 | */ | |
7c657876 | 1024 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 1025 | data_was_unread += skb->len; |
7c657876 ACM |
1026 | __kfree_skb(skb); |
1027 | } | |
1028 | ||
346da62c ED |
1029 | /* If socket has been already reset kill it. */ |
1030 | if (sk->sk_state == DCCP_CLOSED) | |
1031 | goto adjudge_to_death; | |
1032 | ||
d83bd95b GR |
1033 | if (data_was_unread) { |
1034 | /* Unread data was tossed, send an appropriate Reset Code */ | |
2f34b329 | 1035 | DCCP_WARN("ABORT with %u bytes unread\n", data_was_unread); |
d83bd95b GR |
1036 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
1037 | dccp_set_state(sk, DCCP_CLOSED); | |
1038 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
1039 | /* Check zero linger _after_ checking for unread data. */ |
1040 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 | 1041 | } else if (sk->sk_state != DCCP_CLOSED) { |
b1fcf55e GR |
1042 | /* |
1043 | * Normal connection termination. May need to wait if there are | |
1044 | * still packets in the TX queue that are delayed by the CCID. | |
1045 | */ | |
1046 | dccp_flush_write_queue(sk, &timeout); | |
0c869620 | 1047 | dccp_terminate_connection(sk); |
7c657876 ACM |
1048 | } |
1049 | ||
b1fcf55e GR |
1050 | /* |
1051 | * Flush write queue. This may be necessary in several cases: | |
1052 | * - we have been closed by the peer but still have application data; | |
1053 | * - abortive termination (unread data or zero linger time), | |
1054 | * - normal termination but queue could not be flushed within time limit | |
1055 | */ | |
1056 | __skb_queue_purge(&sk->sk_write_queue); | |
1057 | ||
7c657876 ACM |
1058 | sk_stream_wait_close(sk, timeout); |
1059 | ||
1060 | adjudge_to_death: | |
134af346 HX |
1061 | state = sk->sk_state; |
1062 | sock_hold(sk); | |
1063 | sock_orphan(sk); | |
134af346 | 1064 | |
7ad07e7c ACM |
1065 | /* |
1066 | * It is the last release_sock in its life. It will remove backlog. | |
1067 | */ | |
7c657876 ACM |
1068 | release_sock(sk); |
1069 | /* | |
1070 | * Now socket is owned by kernel and we acquire BH lock | |
1071 | * to finish close. No need to check for user refs. | |
1072 | */ | |
1073 | local_bh_disable(); | |
1074 | bh_lock_sock(sk); | |
547b792c | 1075 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 1076 | |
eb4dea58 HX |
1077 | percpu_counter_inc(sk->sk_prot->orphan_count); |
1078 | ||
134af346 HX |
1079 | /* Have we already been destroyed by a softirq or backlog? */ |
1080 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
1081 | goto out; | |
7ad07e7c | 1082 | |
7c657876 ACM |
1083 | if (sk->sk_state == DCCP_CLOSED) |
1084 | inet_csk_destroy_sock(sk); | |
1085 | ||
1086 | /* Otherwise, socket is reprieved until protocol close. */ | |
1087 | ||
134af346 | 1088 | out: |
7c657876 ACM |
1089 | bh_unlock_sock(sk); |
1090 | local_bh_enable(); | |
1091 | sock_put(sk); | |
1092 | } | |
1093 | ||
f21e68ca ACM |
1094 | EXPORT_SYMBOL_GPL(dccp_close); |
1095 | ||
7c657876 ACM |
1096 | void dccp_shutdown(struct sock *sk, int how) |
1097 | { | |
8e8c71f1 | 1098 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1099 | } |
1100 | ||
f21e68ca ACM |
1101 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1102 | ||
0c5b8a46 | 1103 | static inline int __init dccp_mib_init(void) |
7c657876 | 1104 | { |
698365fa WC |
1105 | dccp_statistics = alloc_percpu(struct dccp_mib); |
1106 | if (!dccp_statistics) | |
1107 | return -ENOMEM; | |
1108 | return 0; | |
7c657876 ACM |
1109 | } |
1110 | ||
24e8b7e4 | 1111 | static inline void dccp_mib_exit(void) |
46f09ffa | 1112 | { |
698365fa | 1113 | free_percpu(dccp_statistics); |
46f09ffa ACM |
1114 | } |
1115 | ||
7c657876 ACM |
1116 | static int thash_entries; |
1117 | module_param(thash_entries, int, 0444); | |
1118 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1119 | ||
a1d3a355 | 1120 | #ifdef CONFIG_IP_DCCP_DEBUG |
eb939922 | 1121 | bool dccp_debug; |
43264991 | 1122 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1123 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1124 | |
1125 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1126 | #endif |
7c657876 ACM |
1127 | |
1128 | static int __init dccp_init(void) | |
1129 | { | |
1130 | unsigned long goal; | |
1131 | int ehash_order, bhash_order, i; | |
dd24c001 | 1132 | int rc; |
7c657876 | 1133 | |
028b0275 PM |
1134 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1135 | FIELD_SIZEOF(struct sk_buff, cb)); | |
908c7f19 | 1136 | rc = percpu_counter_init(&dccp_orphan_count, 0, GFP_KERNEL); |
dd24c001 | 1137 | if (rc) |
d14a0ebd | 1138 | goto out_fail; |
dd24c001 | 1139 | rc = -ENOBUFS; |
5caea4ea | 1140 | inet_hashinfo_init(&dccp_hashinfo); |
7690af3f ACM |
1141 | dccp_hashinfo.bind_bucket_cachep = |
1142 | kmem_cache_create("dccp_bind_bucket", | |
1143 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1144 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1145 | if (!dccp_hashinfo.bind_bucket_cachep) |
dd24c001 | 1146 | goto out_free_percpu; |
7c657876 ACM |
1147 | |
1148 | /* | |
1149 | * Size and allocate the main established and bind bucket | |
1150 | * hash tables. | |
1151 | * | |
1152 | * The methodology is similar to that of the buffer cache. | |
1153 | */ | |
4481374c JB |
1154 | if (totalram_pages >= (128 * 1024)) |
1155 | goal = totalram_pages >> (21 - PAGE_SHIFT); | |
7c657876 | 1156 | else |
4481374c | 1157 | goal = totalram_pages >> (23 - PAGE_SHIFT); |
7c657876 ACM |
1158 | |
1159 | if (thash_entries) | |
7690af3f ACM |
1160 | goal = (thash_entries * |
1161 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1162 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1163 | ; | |
1164 | do { | |
f373b53b | 1165 | unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE / |
7c657876 | 1166 | sizeof(struct inet_ehash_bucket); |
f373b53b ED |
1167 | |
1168 | while (hash_size & (hash_size - 1)) | |
1169 | hash_size--; | |
1170 | dccp_hashinfo.ehash_mask = hash_size - 1; | |
7c657876 | 1171 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) |
1c29b3ff | 1172 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order); |
7c657876 ACM |
1173 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); |
1174 | ||
1175 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1176 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1177 | goto out_free_bind_bucket_cachep; |
1178 | } | |
1179 | ||
05dbc7b5 | 1180 | for (i = 0; i <= dccp_hashinfo.ehash_mask; i++) |
3ab5aee7 | 1181 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); |
7c657876 | 1182 | |
230140cf ED |
1183 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1184 | goto out_free_dccp_ehash; | |
1185 | ||
7c657876 ACM |
1186 | bhash_order = ehash_order; |
1187 | ||
1188 | do { | |
1189 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1190 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1191 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1192 | bhash_order > 0) | |
7c657876 ACM |
1193 | continue; |
1194 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1c29b3ff | 1195 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, bhash_order); |
7c657876 ACM |
1196 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); |
1197 | ||
1198 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1199 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1200 | goto out_free_dccp_locks; |
7c657876 ACM |
1201 | } |
1202 | ||
1203 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1204 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1205 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1206 | } | |
1207 | ||
46f09ffa | 1208 | rc = dccp_mib_init(); |
fa23e2ec | 1209 | if (rc) |
7c657876 ACM |
1210 | goto out_free_dccp_bhash; |
1211 | ||
9b07ef5d | 1212 | rc = dccp_ackvec_init(); |
7c657876 | 1213 | if (rc) |
b61fafc4 | 1214 | goto out_free_dccp_mib; |
9b07ef5d | 1215 | |
e55d912f | 1216 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1217 | if (rc) |
1218 | goto out_ackvec_exit; | |
4c70f383 | 1219 | |
ddebc973 GR |
1220 | rc = ccid_initialize_builtins(); |
1221 | if (rc) | |
1222 | goto out_sysctl_exit; | |
1223 | ||
4c70f383 | 1224 | dccp_timestamping_init(); |
d14a0ebd GR |
1225 | |
1226 | return 0; | |
1227 | ||
ddebc973 GR |
1228 | out_sysctl_exit: |
1229 | dccp_sysctl_exit(); | |
9b07ef5d ACM |
1230 | out_ackvec_exit: |
1231 | dccp_ackvec_exit(); | |
b61fafc4 | 1232 | out_free_dccp_mib: |
46f09ffa | 1233 | dccp_mib_exit(); |
7c657876 ACM |
1234 | out_free_dccp_bhash: |
1235 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
230140cf ED |
1236 | out_free_dccp_locks: |
1237 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1238 | out_free_dccp_ehash: |
1239 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
7c657876 ACM |
1240 | out_free_bind_bucket_cachep: |
1241 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
dd24c001 ED |
1242 | out_free_percpu: |
1243 | percpu_counter_destroy(&dccp_orphan_count); | |
d14a0ebd GR |
1244 | out_fail: |
1245 | dccp_hashinfo.bhash = NULL; | |
1246 | dccp_hashinfo.ehash = NULL; | |
1247 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
1248 | return rc; | |
7c657876 ACM |
1249 | } |
1250 | ||
7c657876 ACM |
1251 | static void __exit dccp_fini(void) |
1252 | { | |
ddebc973 | 1253 | ccid_cleanup_builtins(); |
46f09ffa | 1254 | dccp_mib_exit(); |
725ba8ee ACM |
1255 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1256 | get_order(dccp_hashinfo.bhash_size * | |
1257 | sizeof(struct inet_bind_hashbucket))); | |
1258 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
f373b53b | 1259 | get_order((dccp_hashinfo.ehash_mask + 1) * |
725ba8ee | 1260 | sizeof(struct inet_ehash_bucket))); |
230140cf | 1261 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1262 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1263 | dccp_ackvec_exit(); |
e55d912f | 1264 | dccp_sysctl_exit(); |
476181cb | 1265 | percpu_counter_destroy(&dccp_orphan_count); |
7c657876 ACM |
1266 | } |
1267 | ||
1268 | module_init(dccp_init); | |
1269 | module_exit(dccp_fini); | |
1270 | ||
7c657876 ACM |
1271 | MODULE_LICENSE("GPL"); |
1272 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1273 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |