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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
7c657876 ACM |
24 | #include <net/checksum.h> |
25 | ||
14c85021 | 26 | #include <net/inet_sock.h> |
7c657876 ACM |
27 | #include <net/sock.h> |
28 | #include <net/xfrm.h> | |
29 | ||
6273172e | 30 | #include <asm/ioctls.h> |
7c657876 ACM |
31 | #include <linux/spinlock.h> |
32 | #include <linux/timer.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/poll.h> | |
7c657876 ACM |
35 | |
36 | #include "ccid.h" | |
37 | #include "dccp.h" | |
afe00251 | 38 | #include "feat.h" |
7c657876 | 39 | |
ba89966c | 40 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 | 41 | |
f21e68ca ACM |
42 | EXPORT_SYMBOL_GPL(dccp_statistics); |
43 | ||
dd24c001 | 44 | struct percpu_counter dccp_orphan_count; |
f21e68ca ACM |
45 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
46 | ||
5caea4ea | 47 | struct inet_hashinfo dccp_hashinfo; |
075ae866 ACM |
48 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
49 | ||
b1308dc0 IM |
50 | /* the maximum queue length for tx in packets. 0 is no limit */ |
51 | int sysctl_dccp_tx_qlen __read_mostly = 5; | |
52 | ||
1f4f0f64 | 53 | #ifdef CONFIG_IP_DCCP_DEBUG |
54 | static const char *dccp_state_name(const int state) | |
55 | { | |
56 | static const char *const dccp_state_names[] = { | |
57 | [DCCP_OPEN] = "OPEN", | |
58 | [DCCP_REQUESTING] = "REQUESTING", | |
59 | [DCCP_PARTOPEN] = "PARTOPEN", | |
60 | [DCCP_LISTEN] = "LISTEN", | |
61 | [DCCP_RESPOND] = "RESPOND", | |
62 | [DCCP_CLOSING] = "CLOSING", | |
63 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
64 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
65 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
66 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
67 | [DCCP_CLOSED] = "CLOSED", | |
68 | }; | |
69 | ||
70 | if (state >= DCCP_MAX_STATES) | |
71 | return "INVALID STATE!"; | |
72 | else | |
73 | return dccp_state_names[state]; | |
74 | } | |
75 | #endif | |
76 | ||
c25a18ba ACM |
77 | void dccp_set_state(struct sock *sk, const int state) |
78 | { | |
79 | const int oldstate = sk->sk_state; | |
80 | ||
f11135a3 | 81 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
c25a18ba ACM |
82 | dccp_state_name(oldstate), dccp_state_name(state)); |
83 | WARN_ON(state == oldstate); | |
84 | ||
85 | switch (state) { | |
86 | case DCCP_OPEN: | |
87 | if (oldstate != DCCP_OPEN) | |
88 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
6eb55d17 GR |
89 | /* Client retransmits all Confirm options until entering OPEN */ |
90 | if (oldstate == DCCP_PARTOPEN) | |
91 | dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); | |
c25a18ba ACM |
92 | break; |
93 | ||
94 | case DCCP_CLOSED: | |
0c869620 GR |
95 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
96 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
97 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
98 | ||
99 | sk->sk_prot->unhash(sk); | |
100 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
101 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 102 | inet_put_port(sk); |
c25a18ba ACM |
103 | /* fall through */ |
104 | default: | |
105 | if (oldstate == DCCP_OPEN) | |
106 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
107 | } | |
108 | ||
109 | /* Change state AFTER socket is unhashed to avoid closed | |
110 | * socket sitting in hash tables. | |
111 | */ | |
112 | sk->sk_state = state; | |
113 | } | |
114 | ||
115 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
116 | ||
0c869620 GR |
117 | static void dccp_finish_passive_close(struct sock *sk) |
118 | { | |
119 | switch (sk->sk_state) { | |
120 | case DCCP_PASSIVE_CLOSE: | |
121 | /* Node (client or server) has received Close packet. */ | |
122 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
123 | dccp_set_state(sk, DCCP_CLOSED); | |
124 | break; | |
125 | case DCCP_PASSIVE_CLOSEREQ: | |
126 | /* | |
127 | * Client received CloseReq. We set the `active' flag so that | |
128 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
129 | */ | |
130 | dccp_send_close(sk, 1); | |
131 | dccp_set_state(sk, DCCP_CLOSING); | |
132 | } | |
133 | } | |
134 | ||
c25a18ba ACM |
135 | void dccp_done(struct sock *sk) |
136 | { | |
137 | dccp_set_state(sk, DCCP_CLOSED); | |
138 | dccp_clear_xmit_timers(sk); | |
139 | ||
140 | sk->sk_shutdown = SHUTDOWN_MASK; | |
141 | ||
142 | if (!sock_flag(sk, SOCK_DEAD)) | |
143 | sk->sk_state_change(sk); | |
144 | else | |
145 | inet_csk_destroy_sock(sk); | |
146 | } | |
147 | ||
148 | EXPORT_SYMBOL_GPL(dccp_done); | |
149 | ||
7c657876 ACM |
150 | const char *dccp_packet_name(const int type) |
151 | { | |
36cbd3dc | 152 | static const char *const dccp_packet_names[] = { |
7c657876 ACM |
153 | [DCCP_PKT_REQUEST] = "REQUEST", |
154 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
155 | [DCCP_PKT_DATA] = "DATA", | |
156 | [DCCP_PKT_ACK] = "ACK", | |
157 | [DCCP_PKT_DATAACK] = "DATAACK", | |
158 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
159 | [DCCP_PKT_CLOSE] = "CLOSE", | |
160 | [DCCP_PKT_RESET] = "RESET", | |
161 | [DCCP_PKT_SYNC] = "SYNC", | |
162 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
163 | }; | |
164 | ||
165 | if (type >= DCCP_NR_PKT_TYPES) | |
166 | return "INVALID"; | |
167 | else | |
168 | return dccp_packet_names[type]; | |
169 | } | |
170 | ||
171 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
172 | ||
72478873 | 173 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
174 | { |
175 | struct dccp_sock *dp = dccp_sk(sk); | |
176 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3e0fadc5 | 177 | |
e18d7a98 ACM |
178 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
179 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
180 | sk->sk_state = DCCP_CLOSED; | |
181 | sk->sk_write_space = dccp_write_space; | |
182 | icsk->icsk_sync_mss = dccp_sync_mss; | |
410e27a4 | 183 | dp->dccps_mss_cache = 536; |
e18d7a98 ACM |
184 | dp->dccps_rate_last = jiffies; |
185 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
186 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
410e27a4 | 187 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
871a2c16 | 188 | dp->dccps_tx_qlen = sysctl_dccp_tx_qlen; |
e18d7a98 ACM |
189 | |
190 | dccp_init_xmit_timers(sk); | |
191 | ||
ac75773c | 192 | INIT_LIST_HEAD(&dp->dccps_featneg); |
6eb55d17 GR |
193 | /* control socket doesn't need feat nego */ |
194 | if (likely(ctl_sock_initialized)) | |
195 | return dccp_feat_init(sk); | |
3e0fadc5 ACM |
196 | return 0; |
197 | } | |
198 | ||
199 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
200 | ||
7d06b2e0 | 201 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
202 | { |
203 | struct dccp_sock *dp = dccp_sk(sk); | |
204 | ||
205 | /* | |
206 | * DCCP doesn't use sk_write_queue, just sk_send_head | |
207 | * for retransmissions | |
208 | */ | |
209 | if (sk->sk_send_head != NULL) { | |
210 | kfree_skb(sk->sk_send_head); | |
211 | sk->sk_send_head = NULL; | |
212 | } | |
213 | ||
214 | /* Clean up a referenced DCCP bind bucket. */ | |
215 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 216 | inet_put_port(sk); |
3e0fadc5 ACM |
217 | |
218 | kfree(dp->dccps_service_list); | |
219 | dp->dccps_service_list = NULL; | |
220 | ||
6fdd34d4 | 221 | if (dp->dccps_hc_rx_ackvec != NULL) { |
3e0fadc5 ACM |
222 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
223 | dp->dccps_hc_rx_ackvec = NULL; | |
224 | } | |
225 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
226 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
227 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
228 | ||
229 | /* clean up feature negotiation state */ | |
d99a7bd2 | 230 | dccp_feat_list_purge(&dp->dccps_featneg); |
3e0fadc5 ACM |
231 | } |
232 | ||
233 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
234 | ||
72a3effa | 235 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 236 | { |
67e6b629 ACM |
237 | struct dccp_sock *dp = dccp_sk(sk); |
238 | ||
239 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
9eca0a47 GR |
240 | /* do not start to listen if feature negotiation setup fails */ |
241 | if (dccp_feat_finalise_settings(dp)) | |
242 | return -EPROTO; | |
72a3effa | 243 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
244 | } |
245 | ||
ce865a61 GR |
246 | static inline int dccp_need_reset(int state) |
247 | { | |
248 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
249 | state != DCCP_REQUESTING; | |
250 | } | |
251 | ||
7c657876 ACM |
252 | int dccp_disconnect(struct sock *sk, int flags) |
253 | { | |
254 | struct inet_connection_sock *icsk = inet_csk(sk); | |
255 | struct inet_sock *inet = inet_sk(sk); | |
256 | int err = 0; | |
257 | const int old_state = sk->sk_state; | |
258 | ||
259 | if (old_state != DCCP_CLOSED) | |
260 | dccp_set_state(sk, DCCP_CLOSED); | |
261 | ||
ce865a61 GR |
262 | /* |
263 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
264 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
265 | */ | |
7c657876 ACM |
266 | if (old_state == DCCP_LISTEN) { |
267 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
268 | } else if (dccp_need_reset(old_state)) { |
269 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
270 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
271 | } else if (old_state == DCCP_REQUESTING) |
272 | sk->sk_err = ECONNRESET; | |
273 | ||
274 | dccp_clear_xmit_timers(sk); | |
48816322 | 275 | |
7c657876 | 276 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 277 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
278 | if (sk->sk_send_head != NULL) { |
279 | __kfree_skb(sk->sk_send_head); | |
280 | sk->sk_send_head = NULL; | |
281 | } | |
282 | ||
c720c7e8 | 283 | inet->inet_dport = 0; |
7c657876 ACM |
284 | |
285 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
286 | inet_reset_saddr(sk); | |
287 | ||
288 | sk->sk_shutdown = 0; | |
289 | sock_reset_flag(sk, SOCK_DONE); | |
290 | ||
291 | icsk->icsk_backoff = 0; | |
292 | inet_csk_delack_init(sk); | |
293 | __sk_dst_reset(sk); | |
294 | ||
c720c7e8 | 295 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
7c657876 ACM |
296 | |
297 | sk->sk_error_report(sk); | |
298 | return err; | |
299 | } | |
300 | ||
f21e68ca ACM |
301 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
302 | ||
331968bd ACM |
303 | /* |
304 | * Wait for a DCCP event. | |
305 | * | |
306 | * Note that we don't need to lock the socket, as the upper poll layers | |
307 | * take care of normal races (between the test and the event) and we don't | |
308 | * go look at any of the socket buffers directly. | |
309 | */ | |
f21e68ca ACM |
310 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
311 | poll_table *wait) | |
331968bd ACM |
312 | { |
313 | unsigned int mask; | |
314 | struct sock *sk = sock->sk; | |
315 | ||
aa395145 | 316 | sock_poll_wait(file, sk_sleep(sk), wait); |
331968bd ACM |
317 | if (sk->sk_state == DCCP_LISTEN) |
318 | return inet_csk_listen_poll(sk); | |
319 | ||
320 | /* Socket is not locked. We are protected from async events | |
321 | by poll logic and correct handling of state changes | |
322 | made by another threads is impossible in any case. | |
323 | */ | |
324 | ||
325 | mask = 0; | |
326 | if (sk->sk_err) | |
327 | mask = POLLERR; | |
328 | ||
329 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
330 | mask |= POLLHUP; | |
331 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
f348d70a | 332 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
331968bd ACM |
333 | |
334 | /* Connected? */ | |
335 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
336 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
337 | mask |= POLLIN | POLLRDNORM; | |
338 | ||
339 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
340 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
341 | mask |= POLLOUT | POLLWRNORM; | |
342 | } else { /* send SIGIO later */ | |
343 | set_bit(SOCK_ASYNC_NOSPACE, | |
344 | &sk->sk_socket->flags); | |
345 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
346 | ||
347 | /* Race breaker. If space is freed after | |
348 | * wspace test but before the flags are set, | |
349 | * IO signal will be lost. | |
350 | */ | |
351 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
352 | mask |= POLLOUT | POLLWRNORM; | |
353 | } | |
354 | } | |
355 | } | |
356 | return mask; | |
357 | } | |
358 | ||
f21e68ca ACM |
359 | EXPORT_SYMBOL_GPL(dccp_poll); |
360 | ||
7c657876 ACM |
361 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
362 | { | |
6273172e ACM |
363 | int rc = -ENOTCONN; |
364 | ||
365 | lock_sock(sk); | |
366 | ||
367 | if (sk->sk_state == DCCP_LISTEN) | |
368 | goto out; | |
369 | ||
370 | switch (cmd) { | |
371 | case SIOCINQ: { | |
372 | struct sk_buff *skb; | |
373 | unsigned long amount = 0; | |
374 | ||
375 | skb = skb_peek(&sk->sk_receive_queue); | |
376 | if (skb != NULL) { | |
377 | /* | |
378 | * We will only return the amount of this packet since | |
379 | * that is all that will be read. | |
380 | */ | |
381 | amount = skb->len; | |
382 | } | |
383 | rc = put_user(amount, (int __user *)arg); | |
384 | } | |
385 | break; | |
386 | default: | |
387 | rc = -ENOIOCTLCMD; | |
388 | break; | |
389 | } | |
390 | out: | |
391 | release_sock(sk); | |
392 | return rc; | |
7c657876 ACM |
393 | } |
394 | ||
f21e68ca ACM |
395 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
396 | ||
60fe62e7 | 397 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
b7058842 | 398 | char __user *optval, unsigned int optlen) |
67e6b629 ACM |
399 | { |
400 | struct dccp_sock *dp = dccp_sk(sk); | |
401 | struct dccp_service_list *sl = NULL; | |
402 | ||
8109b02b | 403 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
404 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
405 | return -EINVAL; | |
406 | ||
407 | if (optlen > sizeof(service)) { | |
408 | sl = kmalloc(optlen, GFP_KERNEL); | |
409 | if (sl == NULL) | |
410 | return -ENOMEM; | |
411 | ||
412 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
413 | if (copy_from_user(sl->dccpsl_list, | |
414 | optval + sizeof(service), | |
415 | optlen - sizeof(service)) || | |
416 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
417 | kfree(sl); | |
418 | return -EFAULT; | |
419 | } | |
420 | } | |
421 | ||
422 | lock_sock(sk); | |
423 | dp->dccps_service = service; | |
424 | ||
a51482bd | 425 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
426 | |
427 | dp->dccps_service_list = sl; | |
428 | release_sock(sk); | |
429 | return 0; | |
430 | } | |
431 | ||
29450559 GR |
432 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
433 | { | |
434 | u8 *list, len; | |
435 | int i, rc; | |
436 | ||
437 | if (cscov < 0 || cscov > 15) | |
438 | return -EINVAL; | |
439 | /* | |
440 | * Populate a list of permissible values, in the range cscov...15. This | |
441 | * is necessary since feature negotiation of single values only works if | |
442 | * both sides incidentally choose the same value. Since the list starts | |
443 | * lowest-value first, negotiation will pick the smallest shared value. | |
444 | */ | |
445 | if (cscov == 0) | |
446 | return 0; | |
447 | len = 16 - cscov; | |
448 | ||
449 | list = kmalloc(len, GFP_KERNEL); | |
450 | if (list == NULL) | |
451 | return -ENOBUFS; | |
452 | ||
453 | for (i = 0; i < len; i++) | |
454 | list[i] = cscov++; | |
455 | ||
456 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); | |
457 | ||
458 | if (rc == 0) { | |
459 | if (rx) | |
460 | dccp_sk(sk)->dccps_pcrlen = cscov; | |
461 | else | |
462 | dccp_sk(sk)->dccps_pcslen = cscov; | |
463 | } | |
464 | kfree(list); | |
465 | return rc; | |
466 | } | |
467 | ||
b20a9c24 | 468 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
b7058842 | 469 | char __user *optval, unsigned int optlen) |
b20a9c24 GR |
470 | { |
471 | u8 *val; | |
472 | int rc = 0; | |
473 | ||
474 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) | |
475 | return -EINVAL; | |
476 | ||
042604d2 JL |
477 | val = memdup_user(optval, optlen); |
478 | if (IS_ERR(val)) | |
479 | return PTR_ERR(val); | |
b20a9c24 GR |
480 | |
481 | lock_sock(sk); | |
482 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) | |
483 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); | |
484 | ||
485 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) | |
486 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); | |
487 | release_sock(sk); | |
488 | ||
489 | kfree(val); | |
490 | return rc; | |
491 | } | |
492 | ||
3fdadf7d | 493 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 494 | char __user *optval, unsigned int optlen) |
7c657876 | 495 | { |
09dbc389 GR |
496 | struct dccp_sock *dp = dccp_sk(sk); |
497 | int val, err = 0; | |
7c657876 | 498 | |
19102996 GR |
499 | switch (optname) { |
500 | case DCCP_SOCKOPT_PACKET_SIZE: | |
501 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
502 | return 0; | |
503 | case DCCP_SOCKOPT_CHANGE_L: | |
504 | case DCCP_SOCKOPT_CHANGE_R: | |
505 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); | |
506 | return 0; | |
b20a9c24 GR |
507 | case DCCP_SOCKOPT_CCID: |
508 | case DCCP_SOCKOPT_RX_CCID: | |
509 | case DCCP_SOCKOPT_TX_CCID: | |
510 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); | |
19102996 GR |
511 | } |
512 | ||
513 | if (optlen < (int)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) { |
b8599d20 GR |
524 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
525 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
526 | err = -EOPNOTSUPP; | |
527 | else | |
528 | dp->dccps_server_timewait = (val != 0); | |
529 | break; | |
29450559 GR |
530 | case DCCP_SOCKOPT_SEND_CSCOV: |
531 | err = dccp_setsockopt_cscov(sk, val, false); | |
d6da3511 | 532 | break; |
29450559 GR |
533 | case DCCP_SOCKOPT_RECV_CSCOV: |
534 | err = dccp_setsockopt_cscov(sk, val, true); | |
d6da3511 | 535 | break; |
871a2c16 TG |
536 | case DCCP_SOCKOPT_QPOLICY_ID: |
537 | if (sk->sk_state != DCCP_CLOSED) | |
538 | err = -EISCONN; | |
539 | else if (val < 0 || val >= DCCPQ_POLICY_MAX) | |
540 | err = -EINVAL; | |
541 | else | |
542 | dp->dccps_qpolicy = val; | |
543 | break; | |
544 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: | |
545 | if (val < 0) | |
546 | err = -EINVAL; | |
547 | else | |
548 | dp->dccps_tx_qlen = val; | |
549 | break; | |
a84ffe43 ACM |
550 | default: |
551 | err = -ENOPROTOOPT; | |
552 | break; | |
553 | } | |
410e27a4 | 554 | release_sock(sk); |
19102996 | 555 | |
a84ffe43 | 556 | return err; |
7c657876 ACM |
557 | } |
558 | ||
3fdadf7d | 559 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 560 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
561 | { |
562 | if (level != SOL_DCCP) | |
563 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
564 | optname, optval, | |
565 | optlen); | |
566 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
567 | } | |
543d9cfe | 568 | |
f21e68ca ACM |
569 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
570 | ||
3fdadf7d DM |
571 | #ifdef CONFIG_COMPAT |
572 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 573 | char __user *optval, unsigned int optlen) |
3fdadf7d | 574 | { |
dec73ff0 ACM |
575 | if (level != SOL_DCCP) |
576 | return inet_csk_compat_setsockopt(sk, level, optname, | |
577 | optval, optlen); | |
3fdadf7d DM |
578 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
579 | } | |
543d9cfe | 580 | |
3fdadf7d DM |
581 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
582 | #endif | |
583 | ||
67e6b629 | 584 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 585 | __be32 __user *optval, |
67e6b629 ACM |
586 | int __user *optlen) |
587 | { | |
588 | const struct dccp_sock *dp = dccp_sk(sk); | |
589 | const struct dccp_service_list *sl; | |
590 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
591 | ||
592 | lock_sock(sk); | |
67e6b629 ACM |
593 | if ((sl = dp->dccps_service_list) != NULL) { |
594 | slen = sl->dccpsl_nr * sizeof(u32); | |
595 | total_len += slen; | |
596 | } | |
597 | ||
598 | err = -EINVAL; | |
599 | if (total_len > len) | |
600 | goto out; | |
601 | ||
602 | err = 0; | |
603 | if (put_user(total_len, optlen) || | |
604 | put_user(dp->dccps_service, optval) || | |
605 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
606 | err = -EFAULT; | |
607 | out: | |
608 | release_sock(sk); | |
609 | return err; | |
610 | } | |
611 | ||
3fdadf7d | 612 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 613 | char __user *optval, int __user *optlen) |
7c657876 | 614 | { |
a84ffe43 ACM |
615 | struct dccp_sock *dp; |
616 | int val, len; | |
7c657876 | 617 | |
a84ffe43 ACM |
618 | if (get_user(len, optlen)) |
619 | return -EFAULT; | |
620 | ||
39ebc027 | 621 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
622 | return -EINVAL; |
623 | ||
624 | dp = dccp_sk(sk); | |
625 | ||
626 | switch (optname) { | |
627 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 628 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 629 | return 0; |
88f964db ACM |
630 | case DCCP_SOCKOPT_SERVICE: |
631 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 632 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
633 | case DCCP_SOCKOPT_GET_CUR_MPS: |
634 | val = dp->dccps_mss_cache; | |
7c559a9e | 635 | break; |
d90ebcbf GR |
636 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
637 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); | |
71c262a3 GR |
638 | case DCCP_SOCKOPT_TX_CCID: |
639 | val = ccid_get_current_tx_ccid(dp); | |
640 | if (val < 0) | |
641 | return -ENOPROTOOPT; | |
642 | break; | |
643 | case DCCP_SOCKOPT_RX_CCID: | |
644 | val = ccid_get_current_rx_ccid(dp); | |
645 | if (val < 0) | |
646 | return -ENOPROTOOPT; | |
647 | break; | |
b8599d20 GR |
648 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
649 | val = dp->dccps_server_timewait; | |
b8599d20 | 650 | break; |
6f4e5fff GR |
651 | case DCCP_SOCKOPT_SEND_CSCOV: |
652 | val = dp->dccps_pcslen; | |
653 | break; | |
654 | case DCCP_SOCKOPT_RECV_CSCOV: | |
655 | val = dp->dccps_pcrlen; | |
656 | break; | |
871a2c16 TG |
657 | case DCCP_SOCKOPT_QPOLICY_ID: |
658 | val = dp->dccps_qpolicy; | |
659 | break; | |
660 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: | |
661 | val = dp->dccps_tx_qlen; | |
662 | break; | |
88f964db ACM |
663 | case 128 ... 191: |
664 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
665 | len, (u32 __user *)optval, optlen); | |
666 | case 192 ... 255: | |
667 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
668 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
669 | default: |
670 | return -ENOPROTOOPT; | |
671 | } | |
672 | ||
79133506 | 673 | len = sizeof(val); |
a84ffe43 ACM |
674 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
675 | return -EFAULT; | |
676 | ||
677 | return 0; | |
7c657876 ACM |
678 | } |
679 | ||
3fdadf7d DM |
680 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
681 | char __user *optval, int __user *optlen) | |
682 | { | |
683 | if (level != SOL_DCCP) | |
684 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
685 | optname, optval, | |
686 | optlen); | |
687 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
688 | } | |
543d9cfe | 689 | |
f21e68ca ACM |
690 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
691 | ||
3fdadf7d DM |
692 | #ifdef CONFIG_COMPAT |
693 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 694 | char __user *optval, int __user *optlen) |
3fdadf7d | 695 | { |
dec73ff0 ACM |
696 | if (level != SOL_DCCP) |
697 | return inet_csk_compat_getsockopt(sk, level, optname, | |
698 | optval, optlen); | |
3fdadf7d DM |
699 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
700 | } | |
543d9cfe | 701 | |
3fdadf7d DM |
702 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
703 | #endif | |
704 | ||
871a2c16 TG |
705 | static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb) |
706 | { | |
707 | struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg); | |
708 | ||
709 | /* | |
710 | * Assign an (opaque) qpolicy priority value to skb->priority. | |
711 | * | |
712 | * We are overloading this skb field for use with the qpolicy subystem. | |
713 | * The skb->priority is normally used for the SO_PRIORITY option, which | |
714 | * is initialised from sk_priority. Since the assignment of sk_priority | |
715 | * to skb->priority happens later (on layer 3), we overload this field | |
716 | * for use with queueing priorities as long as the skb is on layer 4. | |
717 | * The default priority value (if nothing is set) is 0. | |
718 | */ | |
719 | skb->priority = 0; | |
720 | ||
721 | for (; cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
722 | ||
723 | if (!CMSG_OK(msg, cmsg)) | |
724 | return -EINVAL; | |
725 | ||
726 | if (cmsg->cmsg_level != SOL_DCCP) | |
727 | continue; | |
728 | ||
04910265 TG |
729 | if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX && |
730 | !dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type)) | |
731 | return -EINVAL; | |
732 | ||
871a2c16 TG |
733 | switch (cmsg->cmsg_type) { |
734 | case DCCP_SCM_PRIORITY: | |
735 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32))) | |
736 | return -EINVAL; | |
737 | skb->priority = *(__u32 *)CMSG_DATA(cmsg); | |
738 | break; | |
739 | default: | |
740 | return -EINVAL; | |
741 | } | |
742 | } | |
743 | return 0; | |
744 | } | |
745 | ||
7c657876 ACM |
746 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
747 | size_t len) | |
748 | { | |
749 | const struct dccp_sock *dp = dccp_sk(sk); | |
750 | const int flags = msg->msg_flags; | |
751 | const int noblock = flags & MSG_DONTWAIT; | |
752 | struct sk_buff *skb; | |
753 | int rc, size; | |
754 | long timeo; | |
755 | ||
756 | if (len > dp->dccps_mss_cache) | |
757 | return -EMSGSIZE; | |
758 | ||
759 | lock_sock(sk); | |
b1308dc0 | 760 | |
871a2c16 | 761 | if (dccp_qpolicy_full(sk)) { |
b1308dc0 IM |
762 | rc = -EAGAIN; |
763 | goto out_release; | |
764 | } | |
765 | ||
27258ee5 | 766 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
767 | |
768 | /* | |
769 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
770 | * so that the trick in dccp_rcv_request_sent_state_process. | |
771 | */ | |
772 | /* Wait for a connection to finish. */ | |
cecd8d0e | 773 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 774 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 775 | goto out_release; |
7c657876 ACM |
776 | |
777 | size = sk->sk_prot->max_header + len; | |
778 | release_sock(sk); | |
779 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
780 | lock_sock(sk); | |
7c657876 ACM |
781 | if (skb == NULL) |
782 | goto out_release; | |
783 | ||
784 | skb_reserve(skb, sk->sk_prot->max_header); | |
785 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
786 | if (rc != 0) |
787 | goto out_discard; | |
788 | ||
871a2c16 TG |
789 | rc = dccp_msghdr_parse(msg, skb); |
790 | if (rc != 0) | |
791 | goto out_discard; | |
792 | ||
793 | dccp_qpolicy_push(sk, skb); | |
b1fcf55e GR |
794 | /* |
795 | * The xmit_timer is set if the TX CCID is rate-based and will expire | |
796 | * when congestion control permits to release further packets into the | |
797 | * network. Window-based CCIDs do not use this timer. | |
798 | */ | |
799 | if (!timer_pending(&dp->dccps_xmit_timer)) | |
800 | dccp_write_xmit(sk); | |
7c657876 ACM |
801 | out_release: |
802 | release_sock(sk); | |
803 | return rc ? : len; | |
27258ee5 ACM |
804 | out_discard: |
805 | kfree_skb(skb); | |
7c657876 | 806 | goto out_release; |
7c657876 ACM |
807 | } |
808 | ||
f21e68ca ACM |
809 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
810 | ||
7c657876 ACM |
811 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
812 | size_t len, int nonblock, int flags, int *addr_len) | |
813 | { | |
814 | const struct dccp_hdr *dh; | |
7c657876 ACM |
815 | long timeo; |
816 | ||
817 | lock_sock(sk); | |
818 | ||
531669a0 ACM |
819 | if (sk->sk_state == DCCP_LISTEN) { |
820 | len = -ENOTCONN; | |
7c657876 | 821 | goto out; |
7c657876 | 822 | } |
7c657876 | 823 | |
531669a0 | 824 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
825 | |
826 | do { | |
531669a0 | 827 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 828 | |
531669a0 ACM |
829 | if (skb == NULL) |
830 | goto verify_sock_status; | |
7c657876 | 831 | |
531669a0 | 832 | dh = dccp_hdr(skb); |
7c657876 | 833 | |
0c869620 GR |
834 | switch (dh->dccph_type) { |
835 | case DCCP_PKT_DATA: | |
836 | case DCCP_PKT_DATAACK: | |
531669a0 | 837 | goto found_ok_skb; |
7c657876 | 838 | |
0c869620 GR |
839 | case DCCP_PKT_CLOSE: |
840 | case DCCP_PKT_CLOSEREQ: | |
841 | if (!(flags & MSG_PEEK)) | |
842 | dccp_finish_passive_close(sk); | |
843 | /* fall through */ | |
844 | case DCCP_PKT_RESET: | |
845 | dccp_pr_debug("found fin (%s) ok!\n", | |
846 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
847 | len = 0; |
848 | goto found_fin_ok; | |
0c869620 GR |
849 | default: |
850 | dccp_pr_debug("packet_type=%s\n", | |
851 | dccp_packet_name(dh->dccph_type)); | |
852 | sk_eat_skb(sk, skb, 0); | |
531669a0 | 853 | } |
531669a0 ACM |
854 | verify_sock_status: |
855 | if (sock_flag(sk, SOCK_DONE)) { | |
856 | len = 0; | |
7c657876 | 857 | break; |
531669a0 | 858 | } |
7c657876 | 859 | |
531669a0 ACM |
860 | if (sk->sk_err) { |
861 | len = sock_error(sk); | |
862 | break; | |
863 | } | |
7c657876 | 864 | |
531669a0 ACM |
865 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
866 | len = 0; | |
867 | break; | |
868 | } | |
7c657876 | 869 | |
531669a0 ACM |
870 | if (sk->sk_state == DCCP_CLOSED) { |
871 | if (!sock_flag(sk, SOCK_DONE)) { | |
872 | /* This occurs when user tries to read | |
873 | * from never connected socket. | |
874 | */ | |
875 | len = -ENOTCONN; | |
7c657876 ACM |
876 | break; |
877 | } | |
531669a0 ACM |
878 | len = 0; |
879 | break; | |
7c657876 ACM |
880 | } |
881 | ||
531669a0 ACM |
882 | if (!timeo) { |
883 | len = -EAGAIN; | |
884 | break; | |
885 | } | |
7c657876 | 886 | |
531669a0 ACM |
887 | if (signal_pending(current)) { |
888 | len = sock_intr_errno(timeo); | |
889 | break; | |
890 | } | |
7c657876 | 891 | |
531669a0 | 892 | sk_wait_data(sk, &timeo); |
7c657876 | 893 | continue; |
7c657876 | 894 | found_ok_skb: |
531669a0 ACM |
895 | if (len > skb->len) |
896 | len = skb->len; | |
897 | else if (len < skb->len) | |
898 | msg->msg_flags |= MSG_TRUNC; | |
899 | ||
900 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
901 | /* Exception. Bailout! */ | |
902 | len = -EFAULT; | |
903 | break; | |
7c657876 | 904 | } |
55d95590 GR |
905 | if (flags & MSG_TRUNC) |
906 | len = skb->len; | |
7c657876 ACM |
907 | found_fin_ok: |
908 | if (!(flags & MSG_PEEK)) | |
624d1164 | 909 | sk_eat_skb(sk, skb, 0); |
7c657876 | 910 | break; |
531669a0 | 911 | } while (1); |
7c657876 ACM |
912 | out: |
913 | release_sock(sk); | |
531669a0 | 914 | return len; |
7c657876 ACM |
915 | } |
916 | ||
f21e68ca ACM |
917 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
918 | ||
919 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
920 | { |
921 | struct sock *sk = sock->sk; | |
922 | unsigned char old_state; | |
923 | int err; | |
924 | ||
925 | lock_sock(sk); | |
926 | ||
927 | err = -EINVAL; | |
928 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
929 | goto out; | |
930 | ||
931 | old_state = sk->sk_state; | |
932 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
933 | goto out; | |
934 | ||
935 | /* Really, if the socket is already in listen state | |
936 | * we can only allow the backlog to be adjusted. | |
937 | */ | |
938 | if (old_state != DCCP_LISTEN) { | |
939 | /* | |
940 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
941 | * see tcp_listen_start | |
942 | */ | |
72a3effa | 943 | err = dccp_listen_start(sk, backlog); |
7c657876 ACM |
944 | if (err) |
945 | goto out; | |
946 | } | |
947 | sk->sk_max_ack_backlog = backlog; | |
948 | err = 0; | |
949 | ||
950 | out: | |
951 | release_sock(sk); | |
952 | return err; | |
953 | } | |
954 | ||
f21e68ca ACM |
955 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
956 | ||
0c869620 | 957 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 958 | { |
0c869620 | 959 | u8 next_state = DCCP_CLOSED; |
7c657876 | 960 | |
0c869620 GR |
961 | switch (sk->sk_state) { |
962 | case DCCP_PASSIVE_CLOSE: | |
963 | case DCCP_PASSIVE_CLOSEREQ: | |
964 | dccp_finish_passive_close(sk); | |
965 | break; | |
966 | case DCCP_PARTOPEN: | |
967 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
968 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
969 | /* fall through */ | |
970 | case DCCP_OPEN: | |
971 | dccp_send_close(sk, 1); | |
7c657876 | 972 | |
b8599d20 GR |
973 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
974 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
975 | next_state = DCCP_ACTIVE_CLOSEREQ; |
976 | else | |
977 | next_state = DCCP_CLOSING; | |
978 | /* fall through */ | |
979 | default: | |
980 | dccp_set_state(sk, next_state); | |
981 | } | |
7c657876 ACM |
982 | } |
983 | ||
984 | void dccp_close(struct sock *sk, long timeout) | |
985 | { | |
97e5848d | 986 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 987 | struct sk_buff *skb; |
d83bd95b | 988 | u32 data_was_unread = 0; |
134af346 | 989 | int state; |
7c657876 ACM |
990 | |
991 | lock_sock(sk); | |
992 | ||
993 | sk->sk_shutdown = SHUTDOWN_MASK; | |
994 | ||
995 | if (sk->sk_state == DCCP_LISTEN) { | |
996 | dccp_set_state(sk, DCCP_CLOSED); | |
997 | ||
998 | /* Special case. */ | |
999 | inet_csk_listen_stop(sk); | |
1000 | ||
1001 | goto adjudge_to_death; | |
1002 | } | |
1003 | ||
97e5848d IM |
1004 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
1005 | ||
7c657876 ACM |
1006 | /* |
1007 | * We need to flush the recv. buffs. We do this only on the | |
1008 | * descriptor close, not protocol-sourced closes, because the | |
1009 | *reader process may not have drained the data yet! | |
1010 | */ | |
7c657876 | 1011 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 1012 | data_was_unread += skb->len; |
7c657876 ACM |
1013 | __kfree_skb(skb); |
1014 | } | |
1015 | ||
d83bd95b GR |
1016 | if (data_was_unread) { |
1017 | /* Unread data was tossed, send an appropriate Reset Code */ | |
2f34b329 | 1018 | DCCP_WARN("ABORT with %u bytes unread\n", data_was_unread); |
d83bd95b GR |
1019 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
1020 | dccp_set_state(sk, DCCP_CLOSED); | |
1021 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
1022 | /* Check zero linger _after_ checking for unread data. */ |
1023 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 | 1024 | } else if (sk->sk_state != DCCP_CLOSED) { |
b1fcf55e GR |
1025 | /* |
1026 | * Normal connection termination. May need to wait if there are | |
1027 | * still packets in the TX queue that are delayed by the CCID. | |
1028 | */ | |
1029 | dccp_flush_write_queue(sk, &timeout); | |
0c869620 | 1030 | dccp_terminate_connection(sk); |
7c657876 ACM |
1031 | } |
1032 | ||
b1fcf55e GR |
1033 | /* |
1034 | * Flush write queue. This may be necessary in several cases: | |
1035 | * - we have been closed by the peer but still have application data; | |
1036 | * - abortive termination (unread data or zero linger time), | |
1037 | * - normal termination but queue could not be flushed within time limit | |
1038 | */ | |
1039 | __skb_queue_purge(&sk->sk_write_queue); | |
1040 | ||
7c657876 ACM |
1041 | sk_stream_wait_close(sk, timeout); |
1042 | ||
1043 | adjudge_to_death: | |
134af346 HX |
1044 | state = sk->sk_state; |
1045 | sock_hold(sk); | |
1046 | sock_orphan(sk); | |
134af346 | 1047 | |
7ad07e7c ACM |
1048 | /* |
1049 | * It is the last release_sock in its life. It will remove backlog. | |
1050 | */ | |
7c657876 ACM |
1051 | release_sock(sk); |
1052 | /* | |
1053 | * Now socket is owned by kernel and we acquire BH lock | |
1054 | * to finish close. No need to check for user refs. | |
1055 | */ | |
1056 | local_bh_disable(); | |
1057 | bh_lock_sock(sk); | |
547b792c | 1058 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 1059 | |
eb4dea58 HX |
1060 | percpu_counter_inc(sk->sk_prot->orphan_count); |
1061 | ||
134af346 HX |
1062 | /* Have we already been destroyed by a softirq or backlog? */ |
1063 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
1064 | goto out; | |
7ad07e7c | 1065 | |
7c657876 ACM |
1066 | if (sk->sk_state == DCCP_CLOSED) |
1067 | inet_csk_destroy_sock(sk); | |
1068 | ||
1069 | /* Otherwise, socket is reprieved until protocol close. */ | |
1070 | ||
134af346 | 1071 | out: |
7c657876 ACM |
1072 | bh_unlock_sock(sk); |
1073 | local_bh_enable(); | |
1074 | sock_put(sk); | |
1075 | } | |
1076 | ||
f21e68ca ACM |
1077 | EXPORT_SYMBOL_GPL(dccp_close); |
1078 | ||
7c657876 ACM |
1079 | void dccp_shutdown(struct sock *sk, int how) |
1080 | { | |
8e8c71f1 | 1081 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1082 | } |
1083 | ||
f21e68ca ACM |
1084 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1085 | ||
24e8b7e4 | 1086 | static inline int dccp_mib_init(void) |
7c657876 | 1087 | { |
7d720c3e | 1088 | return snmp_mib_init((void __percpu **)dccp_statistics, |
1823e4c8 ED |
1089 | sizeof(struct dccp_mib), |
1090 | __alignof__(struct dccp_mib)); | |
7c657876 ACM |
1091 | } |
1092 | ||
24e8b7e4 | 1093 | static inline void dccp_mib_exit(void) |
46f09ffa | 1094 | { |
7d720c3e | 1095 | snmp_mib_free((void __percpu **)dccp_statistics); |
46f09ffa ACM |
1096 | } |
1097 | ||
7c657876 ACM |
1098 | static int thash_entries; |
1099 | module_param(thash_entries, int, 0444); | |
1100 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1101 | ||
a1d3a355 | 1102 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 1103 | int dccp_debug; |
43264991 | 1104 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1105 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1106 | |
1107 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1108 | #endif |
7c657876 ACM |
1109 | |
1110 | static int __init dccp_init(void) | |
1111 | { | |
1112 | unsigned long goal; | |
1113 | int ehash_order, bhash_order, i; | |
dd24c001 | 1114 | int rc; |
7c657876 | 1115 | |
028b0275 PM |
1116 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
1117 | FIELD_SIZEOF(struct sk_buff, cb)); | |
dd24c001 ED |
1118 | rc = percpu_counter_init(&dccp_orphan_count, 0); |
1119 | if (rc) | |
d14a0ebd | 1120 | goto out_fail; |
dd24c001 | 1121 | rc = -ENOBUFS; |
5caea4ea | 1122 | inet_hashinfo_init(&dccp_hashinfo); |
7690af3f ACM |
1123 | dccp_hashinfo.bind_bucket_cachep = |
1124 | kmem_cache_create("dccp_bind_bucket", | |
1125 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1126 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1127 | if (!dccp_hashinfo.bind_bucket_cachep) |
dd24c001 | 1128 | goto out_free_percpu; |
7c657876 ACM |
1129 | |
1130 | /* | |
1131 | * Size and allocate the main established and bind bucket | |
1132 | * hash tables. | |
1133 | * | |
1134 | * The methodology is similar to that of the buffer cache. | |
1135 | */ | |
4481374c JB |
1136 | if (totalram_pages >= (128 * 1024)) |
1137 | goal = totalram_pages >> (21 - PAGE_SHIFT); | |
7c657876 | 1138 | else |
4481374c | 1139 | goal = totalram_pages >> (23 - PAGE_SHIFT); |
7c657876 ACM |
1140 | |
1141 | if (thash_entries) | |
7690af3f ACM |
1142 | goal = (thash_entries * |
1143 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1144 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1145 | ; | |
1146 | do { | |
f373b53b | 1147 | unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE / |
7c657876 | 1148 | sizeof(struct inet_ehash_bucket); |
f373b53b ED |
1149 | |
1150 | while (hash_size & (hash_size - 1)) | |
1151 | hash_size--; | |
1152 | dccp_hashinfo.ehash_mask = hash_size - 1; | |
7c657876 | 1153 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) |
1c29b3ff | 1154 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order); |
7c657876 ACM |
1155 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); |
1156 | ||
1157 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1158 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1159 | goto out_free_bind_bucket_cachep; |
1160 | } | |
1161 | ||
f373b53b | 1162 | for (i = 0; i <= dccp_hashinfo.ehash_mask; i++) { |
3ab5aee7 ED |
1163 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); |
1164 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i); | |
7c657876 ACM |
1165 | } |
1166 | ||
230140cf ED |
1167 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1168 | goto out_free_dccp_ehash; | |
1169 | ||
7c657876 ACM |
1170 | bhash_order = ehash_order; |
1171 | ||
1172 | do { | |
1173 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1174 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1175 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1176 | bhash_order > 0) | |
7c657876 ACM |
1177 | continue; |
1178 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1c29b3ff | 1179 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, bhash_order); |
7c657876 ACM |
1180 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); |
1181 | ||
1182 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1183 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1184 | goto out_free_dccp_locks; |
7c657876 ACM |
1185 | } |
1186 | ||
1187 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1188 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1189 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1190 | } | |
1191 | ||
46f09ffa | 1192 | rc = dccp_mib_init(); |
fa23e2ec | 1193 | if (rc) |
7c657876 ACM |
1194 | goto out_free_dccp_bhash; |
1195 | ||
9b07ef5d | 1196 | rc = dccp_ackvec_init(); |
7c657876 | 1197 | if (rc) |
b61fafc4 | 1198 | goto out_free_dccp_mib; |
9b07ef5d | 1199 | |
e55d912f | 1200 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1201 | if (rc) |
1202 | goto out_ackvec_exit; | |
4c70f383 | 1203 | |
ddebc973 GR |
1204 | rc = ccid_initialize_builtins(); |
1205 | if (rc) | |
1206 | goto out_sysctl_exit; | |
1207 | ||
4c70f383 | 1208 | dccp_timestamping_init(); |
d14a0ebd GR |
1209 | |
1210 | return 0; | |
1211 | ||
ddebc973 GR |
1212 | out_sysctl_exit: |
1213 | dccp_sysctl_exit(); | |
9b07ef5d ACM |
1214 | out_ackvec_exit: |
1215 | dccp_ackvec_exit(); | |
b61fafc4 | 1216 | out_free_dccp_mib: |
46f09ffa | 1217 | dccp_mib_exit(); |
7c657876 ACM |
1218 | out_free_dccp_bhash: |
1219 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
230140cf ED |
1220 | out_free_dccp_locks: |
1221 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1222 | out_free_dccp_ehash: |
1223 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
7c657876 ACM |
1224 | out_free_bind_bucket_cachep: |
1225 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
dd24c001 ED |
1226 | out_free_percpu: |
1227 | percpu_counter_destroy(&dccp_orphan_count); | |
d14a0ebd GR |
1228 | out_fail: |
1229 | dccp_hashinfo.bhash = NULL; | |
1230 | dccp_hashinfo.ehash = NULL; | |
1231 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
1232 | return rc; | |
7c657876 ACM |
1233 | } |
1234 | ||
7c657876 ACM |
1235 | static void __exit dccp_fini(void) |
1236 | { | |
ddebc973 | 1237 | ccid_cleanup_builtins(); |
46f09ffa | 1238 | dccp_mib_exit(); |
725ba8ee ACM |
1239 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1240 | get_order(dccp_hashinfo.bhash_size * | |
1241 | sizeof(struct inet_bind_hashbucket))); | |
1242 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
f373b53b | 1243 | get_order((dccp_hashinfo.ehash_mask + 1) * |
725ba8ee | 1244 | sizeof(struct inet_ehash_bucket))); |
230140cf | 1245 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1246 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1247 | dccp_ackvec_exit(); |
e55d912f | 1248 | dccp_sysctl_exit(); |
476181cb | 1249 | percpu_counter_destroy(&dccp_orphan_count); |
7c657876 ACM |
1250 | } |
1251 | ||
1252 | module_init(dccp_init); | |
1253 | module_exit(dccp_fini); | |
1254 | ||
7c657876 ACM |
1255 | MODULE_LICENSE("GPL"); |
1256 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1257 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |