Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7c657876 ACM |
2 | /* |
3 | * net/dccp/proto.c | |
4 | * | |
5 | * An implementation of the DCCP protocol | |
6 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
7c657876 ACM |
7 | */ |
8 | ||
7c657876 ACM |
9 | #include <linux/dccp.h> |
10 | #include <linux/module.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/in.h> | |
17 | #include <linux/if_arp.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/random.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
7c657876 ACM |
21 | #include <net/checksum.h> |
22 | ||
14c85021 | 23 | #include <net/inet_sock.h> |
120e9dab | 24 | #include <net/inet_common.h> |
7c657876 ACM |
25 | #include <net/sock.h> |
26 | #include <net/xfrm.h> | |
27 | ||
6273172e | 28 | #include <asm/ioctls.h> |
7c657876 ACM |
29 | #include <linux/spinlock.h> |
30 | #include <linux/timer.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/poll.h> | |
7c657876 ACM |
33 | |
34 | #include "ccid.h" | |
35 | #include "dccp.h" | |
afe00251 | 36 | #include "feat.h" |
7c657876 | 37 | |
ee549be6 MH |
38 | #define CREATE_TRACE_POINTS |
39 | #include "trace.h" | |
40 | ||
ba89966c | 41 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 | 42 | |
f21e68ca ACM |
43 | EXPORT_SYMBOL_GPL(dccp_statistics); |
44 | ||
dd24c001 | 45 | struct percpu_counter dccp_orphan_count; |
f21e68ca ACM |
46 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
47 | ||
5caea4ea | 48 | struct inet_hashinfo dccp_hashinfo; |
075ae866 ACM |
49 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
50 | ||
b1308dc0 IM |
51 | /* the maximum queue length for tx in packets. 0 is no limit */ |
52 | int sysctl_dccp_tx_qlen __read_mostly = 5; | |
53 | ||
1f4f0f64 | 54 | #ifdef CONFIG_IP_DCCP_DEBUG |
55 | static const char *dccp_state_name(const int state) | |
56 | { | |
57 | static const char *const dccp_state_names[] = { | |
58 | [DCCP_OPEN] = "OPEN", | |
59 | [DCCP_REQUESTING] = "REQUESTING", | |
60 | [DCCP_PARTOPEN] = "PARTOPEN", | |
61 | [DCCP_LISTEN] = "LISTEN", | |
62 | [DCCP_RESPOND] = "RESPOND", | |
63 | [DCCP_CLOSING] = "CLOSING", | |
64 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", | |
65 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", | |
66 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", | |
67 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
68 | [DCCP_CLOSED] = "CLOSED", | |
69 | }; | |
70 | ||
71 | if (state >= DCCP_MAX_STATES) | |
72 | return "INVALID STATE!"; | |
73 | else | |
74 | return dccp_state_names[state]; | |
75 | } | |
76 | #endif | |
77 | ||
c25a18ba ACM |
78 | void dccp_set_state(struct sock *sk, const int state) |
79 | { | |
80 | const int oldstate = sk->sk_state; | |
81 | ||
f11135a3 | 82 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
c25a18ba ACM |
83 | dccp_state_name(oldstate), dccp_state_name(state)); |
84 | WARN_ON(state == oldstate); | |
85 | ||
86 | switch (state) { | |
87 | case DCCP_OPEN: | |
88 | if (oldstate != DCCP_OPEN) | |
89 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
6eb55d17 GR |
90 | /* Client retransmits all Confirm options until entering OPEN */ |
91 | if (oldstate == DCCP_PARTOPEN) | |
92 | dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); | |
c25a18ba ACM |
93 | break; |
94 | ||
95 | case DCCP_CLOSED: | |
0c869620 GR |
96 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
97 | oldstate == DCCP_CLOSING) | |
c25a18ba ACM |
98 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
99 | ||
100 | sk->sk_prot->unhash(sk); | |
101 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
102 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 103 | inet_put_port(sk); |
c25a18ba ACM |
104 | /* fall through */ |
105 | default: | |
106 | if (oldstate == DCCP_OPEN) | |
107 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
108 | } | |
109 | ||
110 | /* Change state AFTER socket is unhashed to avoid closed | |
111 | * socket sitting in hash tables. | |
112 | */ | |
b0832e30 | 113 | inet_sk_set_state(sk, state); |
c25a18ba ACM |
114 | } |
115 | ||
116 | EXPORT_SYMBOL_GPL(dccp_set_state); | |
117 | ||
0c869620 GR |
118 | static void dccp_finish_passive_close(struct sock *sk) |
119 | { | |
120 | switch (sk->sk_state) { | |
121 | case DCCP_PASSIVE_CLOSE: | |
122 | /* Node (client or server) has received Close packet. */ | |
123 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); | |
124 | dccp_set_state(sk, DCCP_CLOSED); | |
125 | break; | |
126 | case DCCP_PASSIVE_CLOSEREQ: | |
127 | /* | |
128 | * Client received CloseReq. We set the `active' flag so that | |
129 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. | |
130 | */ | |
131 | dccp_send_close(sk, 1); | |
132 | dccp_set_state(sk, DCCP_CLOSING); | |
133 | } | |
134 | } | |
135 | ||
c25a18ba ACM |
136 | void dccp_done(struct sock *sk) |
137 | { | |
138 | dccp_set_state(sk, DCCP_CLOSED); | |
139 | dccp_clear_xmit_timers(sk); | |
140 | ||
141 | sk->sk_shutdown = SHUTDOWN_MASK; | |
142 | ||
143 | if (!sock_flag(sk, SOCK_DEAD)) | |
144 | sk->sk_state_change(sk); | |
145 | else | |
146 | inet_csk_destroy_sock(sk); | |
147 | } | |
148 | ||
149 | EXPORT_SYMBOL_GPL(dccp_done); | |
150 | ||
7c657876 ACM |
151 | const char *dccp_packet_name(const int type) |
152 | { | |
36cbd3dc | 153 | static const char *const dccp_packet_names[] = { |
7c657876 ACM |
154 | [DCCP_PKT_REQUEST] = "REQUEST", |
155 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
156 | [DCCP_PKT_DATA] = "DATA", | |
157 | [DCCP_PKT_ACK] = "ACK", | |
158 | [DCCP_PKT_DATAACK] = "DATAACK", | |
159 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
160 | [DCCP_PKT_CLOSE] = "CLOSE", | |
161 | [DCCP_PKT_RESET] = "RESET", | |
162 | [DCCP_PKT_SYNC] = "SYNC", | |
163 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
164 | }; | |
165 | ||
166 | if (type >= DCCP_NR_PKT_TYPES) | |
167 | return "INVALID"; | |
168 | else | |
169 | return dccp_packet_names[type]; | |
170 | } | |
171 | ||
172 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
173 | ||
120e9dab ED |
174 | static void dccp_sk_destruct(struct sock *sk) |
175 | { | |
176 | struct dccp_sock *dp = dccp_sk(sk); | |
177 | ||
178 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
179 | dp->dccps_hc_tx_ccid = NULL; | |
180 | inet_sock_destruct(sk); | |
181 | } | |
182 | ||
72478873 | 183 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
3e0fadc5 ACM |
184 | { |
185 | struct dccp_sock *dp = dccp_sk(sk); | |
186 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3e0fadc5 | 187 | |
e18d7a98 ACM |
188 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
189 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; | |
190 | sk->sk_state = DCCP_CLOSED; | |
191 | sk->sk_write_space = dccp_write_space; | |
120e9dab | 192 | sk->sk_destruct = dccp_sk_destruct; |
e18d7a98 | 193 | icsk->icsk_sync_mss = dccp_sync_mss; |
410e27a4 | 194 | dp->dccps_mss_cache = 536; |
e18d7a98 ACM |
195 | dp->dccps_rate_last = jiffies; |
196 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
197 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; | |
871a2c16 | 198 | dp->dccps_tx_qlen = sysctl_dccp_tx_qlen; |
e18d7a98 ACM |
199 | |
200 | dccp_init_xmit_timers(sk); | |
201 | ||
ac75773c | 202 | INIT_LIST_HEAD(&dp->dccps_featneg); |
6eb55d17 GR |
203 | /* control socket doesn't need feat nego */ |
204 | if (likely(ctl_sock_initialized)) | |
205 | return dccp_feat_init(sk); | |
3e0fadc5 ACM |
206 | return 0; |
207 | } | |
208 | ||
209 | EXPORT_SYMBOL_GPL(dccp_init_sock); | |
210 | ||
7d06b2e0 | 211 | void dccp_destroy_sock(struct sock *sk) |
3e0fadc5 ACM |
212 | { |
213 | struct dccp_sock *dp = dccp_sk(sk); | |
214 | ||
7749d4ff | 215 | __skb_queue_purge(&sk->sk_write_queue); |
3e0fadc5 ACM |
216 | if (sk->sk_send_head != NULL) { |
217 | kfree_skb(sk->sk_send_head); | |
218 | sk->sk_send_head = NULL; | |
219 | } | |
220 | ||
221 | /* Clean up a referenced DCCP bind bucket. */ | |
222 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
ab1e0a13 | 223 | inet_put_port(sk); |
3e0fadc5 ACM |
224 | |
225 | kfree(dp->dccps_service_list); | |
226 | dp->dccps_service_list = NULL; | |
227 | ||
6fdd34d4 | 228 | if (dp->dccps_hc_rx_ackvec != NULL) { |
3e0fadc5 ACM |
229 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
230 | dp->dccps_hc_rx_ackvec = NULL; | |
231 | } | |
232 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
120e9dab | 233 | dp->dccps_hc_rx_ccid = NULL; |
3e0fadc5 ACM |
234 | |
235 | /* clean up feature negotiation state */ | |
d99a7bd2 | 236 | dccp_feat_list_purge(&dp->dccps_featneg); |
3e0fadc5 ACM |
237 | } |
238 | ||
239 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); | |
240 | ||
72a3effa | 241 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
7c657876 | 242 | { |
67e6b629 ACM |
243 | struct dccp_sock *dp = dccp_sk(sk); |
244 | ||
245 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
9eca0a47 GR |
246 | /* do not start to listen if feature negotiation setup fails */ |
247 | if (dccp_feat_finalise_settings(dp)) | |
248 | return -EPROTO; | |
72a3effa | 249 | return inet_csk_listen_start(sk, backlog); |
7c657876 ACM |
250 | } |
251 | ||
ce865a61 GR |
252 | static inline int dccp_need_reset(int state) |
253 | { | |
254 | return state != DCCP_CLOSED && state != DCCP_LISTEN && | |
255 | state != DCCP_REQUESTING; | |
256 | } | |
257 | ||
7c657876 ACM |
258 | int dccp_disconnect(struct sock *sk, int flags) |
259 | { | |
260 | struct inet_connection_sock *icsk = inet_csk(sk); | |
261 | struct inet_sock *inet = inet_sk(sk); | |
69c64866 | 262 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 ACM |
263 | const int old_state = sk->sk_state; |
264 | ||
265 | if (old_state != DCCP_CLOSED) | |
266 | dccp_set_state(sk, DCCP_CLOSED); | |
267 | ||
ce865a61 GR |
268 | /* |
269 | * This corresponds to the ABORT function of RFC793, sec. 3.8 | |
270 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". | |
271 | */ | |
7c657876 ACM |
272 | if (old_state == DCCP_LISTEN) { |
273 | inet_csk_listen_stop(sk); | |
ce865a61 GR |
274 | } else if (dccp_need_reset(old_state)) { |
275 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); | |
276 | sk->sk_err = ECONNRESET; | |
7c657876 ACM |
277 | } else if (old_state == DCCP_REQUESTING) |
278 | sk->sk_err = ECONNRESET; | |
279 | ||
280 | dccp_clear_xmit_timers(sk); | |
69c64866 | 281 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
69c64866 | 282 | dp->dccps_hc_rx_ccid = NULL; |
48816322 | 283 | |
7c657876 | 284 | __skb_queue_purge(&sk->sk_receive_queue); |
48816322 | 285 | __skb_queue_purge(&sk->sk_write_queue); |
7c657876 ACM |
286 | if (sk->sk_send_head != NULL) { |
287 | __kfree_skb(sk->sk_send_head); | |
288 | sk->sk_send_head = NULL; | |
289 | } | |
290 | ||
c720c7e8 | 291 | inet->inet_dport = 0; |
7c657876 ACM |
292 | |
293 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
294 | inet_reset_saddr(sk); | |
295 | ||
296 | sk->sk_shutdown = 0; | |
297 | sock_reset_flag(sk, SOCK_DONE); | |
298 | ||
299 | icsk->icsk_backoff = 0; | |
300 | inet_csk_delack_init(sk); | |
301 | __sk_dst_reset(sk); | |
302 | ||
c720c7e8 | 303 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
7c657876 ACM |
304 | |
305 | sk->sk_error_report(sk); | |
3285a9aa | 306 | return 0; |
7c657876 ACM |
307 | } |
308 | ||
f21e68ca ACM |
309 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
310 | ||
a11e1d43 LT |
311 | /* |
312 | * Wait for a DCCP event. | |
313 | * | |
314 | * Note that we don't need to lock the socket, as the upper poll layers | |
315 | * take care of normal races (between the test and the event) and we don't | |
316 | * go look at any of the socket buffers directly. | |
317 | */ | |
318 | __poll_t dccp_poll(struct file *file, struct socket *sock, | |
319 | poll_table *wait) | |
331968bd | 320 | { |
ade994f4 | 321 | __poll_t mask; |
331968bd ACM |
322 | struct sock *sk = sock->sk; |
323 | ||
89ab066d | 324 | sock_poll_wait(file, sock, wait); |
331968bd ACM |
325 | if (sk->sk_state == DCCP_LISTEN) |
326 | return inet_csk_listen_poll(sk); | |
327 | ||
328 | /* Socket is not locked. We are protected from async events | |
329 | by poll logic and correct handling of state changes | |
330 | made by another threads is impossible in any case. | |
331 | */ | |
332 | ||
333 | mask = 0; | |
334 | if (sk->sk_err) | |
a9a08845 | 335 | mask = EPOLLERR; |
331968bd ACM |
336 | |
337 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
a9a08845 | 338 | mask |= EPOLLHUP; |
331968bd | 339 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 340 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
331968bd ACM |
341 | |
342 | /* Connected? */ | |
343 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
344 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
a9a08845 | 345 | mask |= EPOLLIN | EPOLLRDNORM; |
331968bd ACM |
346 | |
347 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
64dc6130 | 348 | if (sk_stream_is_writeable(sk)) { |
a9a08845 | 349 | mask |= EPOLLOUT | EPOLLWRNORM; |
331968bd | 350 | } else { /* send SIGIO later */ |
9cd3e072 | 351 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
331968bd ACM |
352 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
353 | ||
354 | /* Race breaker. If space is freed after | |
355 | * wspace test but before the flags are set, | |
356 | * IO signal will be lost. | |
357 | */ | |
64dc6130 | 358 | if (sk_stream_is_writeable(sk)) |
a9a08845 | 359 | mask |= EPOLLOUT | EPOLLWRNORM; |
331968bd ACM |
360 | } |
361 | } | |
362 | } | |
363 | return mask; | |
364 | } | |
365 | ||
a11e1d43 | 366 | EXPORT_SYMBOL_GPL(dccp_poll); |
f21e68ca | 367 | |
7c657876 ACM |
368 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
369 | { | |
6273172e ACM |
370 | int rc = -ENOTCONN; |
371 | ||
372 | lock_sock(sk); | |
373 | ||
374 | if (sk->sk_state == DCCP_LISTEN) | |
375 | goto out; | |
376 | ||
377 | switch (cmd) { | |
378 | case SIOCINQ: { | |
379 | struct sk_buff *skb; | |
380 | unsigned long amount = 0; | |
381 | ||
382 | skb = skb_peek(&sk->sk_receive_queue); | |
383 | if (skb != NULL) { | |
384 | /* | |
385 | * We will only return the amount of this packet since | |
386 | * that is all that will be read. | |
387 | */ | |
388 | amount = skb->len; | |
389 | } | |
390 | rc = put_user(amount, (int __user *)arg); | |
391 | } | |
392 | break; | |
393 | default: | |
394 | rc = -ENOIOCTLCMD; | |
395 | break; | |
396 | } | |
397 | out: | |
398 | release_sock(sk); | |
399 | return rc; | |
7c657876 ACM |
400 | } |
401 | ||
f21e68ca ACM |
402 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
403 | ||
60fe62e7 | 404 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
b7058842 | 405 | char __user *optval, unsigned int optlen) |
67e6b629 ACM |
406 | { |
407 | struct dccp_sock *dp = dccp_sk(sk); | |
408 | struct dccp_service_list *sl = NULL; | |
409 | ||
8109b02b | 410 | if (service == DCCP_SERVICE_INVALID_VALUE || |
67e6b629 ACM |
411 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
412 | return -EINVAL; | |
413 | ||
414 | if (optlen > sizeof(service)) { | |
415 | sl = kmalloc(optlen, GFP_KERNEL); | |
416 | if (sl == NULL) | |
417 | return -ENOMEM; | |
418 | ||
419 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
420 | if (copy_from_user(sl->dccpsl_list, | |
421 | optval + sizeof(service), | |
422 | optlen - sizeof(service)) || | |
423 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
424 | kfree(sl); | |
425 | return -EFAULT; | |
426 | } | |
427 | } | |
428 | ||
429 | lock_sock(sk); | |
430 | dp->dccps_service = service; | |
431 | ||
a51482bd | 432 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
433 | |
434 | dp->dccps_service_list = sl; | |
435 | release_sock(sk); | |
436 | return 0; | |
437 | } | |
438 | ||
29450559 GR |
439 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
440 | { | |
441 | u8 *list, len; | |
442 | int i, rc; | |
443 | ||
444 | if (cscov < 0 || cscov > 15) | |
445 | return -EINVAL; | |
446 | /* | |
447 | * Populate a list of permissible values, in the range cscov...15. This | |
448 | * is necessary since feature negotiation of single values only works if | |
449 | * both sides incidentally choose the same value. Since the list starts | |
450 | * lowest-value first, negotiation will pick the smallest shared value. | |
451 | */ | |
452 | if (cscov == 0) | |
453 | return 0; | |
454 | len = 16 - cscov; | |
455 | ||
456 | list = kmalloc(len, GFP_KERNEL); | |
457 | if (list == NULL) | |
458 | return -ENOBUFS; | |
459 | ||
460 | for (i = 0; i < len; i++) | |
461 | list[i] = cscov++; | |
462 | ||
463 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); | |
464 | ||
465 | if (rc == 0) { | |
466 | if (rx) | |
467 | dccp_sk(sk)->dccps_pcrlen = cscov; | |
468 | else | |
469 | dccp_sk(sk)->dccps_pcslen = cscov; | |
470 | } | |
471 | kfree(list); | |
472 | return rc; | |
473 | } | |
474 | ||
b20a9c24 | 475 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
b7058842 | 476 | char __user *optval, unsigned int optlen) |
b20a9c24 GR |
477 | { |
478 | u8 *val; | |
479 | int rc = 0; | |
480 | ||
481 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) | |
482 | return -EINVAL; | |
483 | ||
042604d2 JL |
484 | val = memdup_user(optval, optlen); |
485 | if (IS_ERR(val)) | |
486 | return PTR_ERR(val); | |
b20a9c24 GR |
487 | |
488 | lock_sock(sk); | |
489 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) | |
490 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); | |
491 | ||
492 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) | |
493 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); | |
494 | release_sock(sk); | |
495 | ||
496 | kfree(val); | |
497 | return rc; | |
498 | } | |
499 | ||
3fdadf7d | 500 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 501 | char __user *optval, unsigned int optlen) |
7c657876 | 502 | { |
09dbc389 GR |
503 | struct dccp_sock *dp = dccp_sk(sk); |
504 | int val, err = 0; | |
7c657876 | 505 | |
19102996 GR |
506 | switch (optname) { |
507 | case DCCP_SOCKOPT_PACKET_SIZE: | |
508 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); | |
509 | return 0; | |
510 | case DCCP_SOCKOPT_CHANGE_L: | |
511 | case DCCP_SOCKOPT_CHANGE_R: | |
512 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); | |
513 | return 0; | |
b20a9c24 GR |
514 | case DCCP_SOCKOPT_CCID: |
515 | case DCCP_SOCKOPT_RX_CCID: | |
516 | case DCCP_SOCKOPT_TX_CCID: | |
517 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); | |
19102996 GR |
518 | } |
519 | ||
520 | if (optlen < (int)sizeof(int)) | |
a84ffe43 ACM |
521 | return -EINVAL; |
522 | ||
523 | if (get_user(val, (int __user *)optval)) | |
524 | return -EFAULT; | |
525 | ||
67e6b629 ACM |
526 | if (optname == DCCP_SOCKOPT_SERVICE) |
527 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 528 | |
67e6b629 | 529 | lock_sock(sk); |
a84ffe43 | 530 | switch (optname) { |
b8599d20 GR |
531 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
532 | if (dp->dccps_role != DCCP_ROLE_SERVER) | |
533 | err = -EOPNOTSUPP; | |
534 | else | |
535 | dp->dccps_server_timewait = (val != 0); | |
536 | break; | |
29450559 GR |
537 | case DCCP_SOCKOPT_SEND_CSCOV: |
538 | err = dccp_setsockopt_cscov(sk, val, false); | |
d6da3511 | 539 | break; |
29450559 GR |
540 | case DCCP_SOCKOPT_RECV_CSCOV: |
541 | err = dccp_setsockopt_cscov(sk, val, true); | |
d6da3511 | 542 | break; |
871a2c16 TG |
543 | case DCCP_SOCKOPT_QPOLICY_ID: |
544 | if (sk->sk_state != DCCP_CLOSED) | |
545 | err = -EISCONN; | |
546 | else if (val < 0 || val >= DCCPQ_POLICY_MAX) | |
547 | err = -EINVAL; | |
548 | else | |
549 | dp->dccps_qpolicy = val; | |
550 | break; | |
551 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: | |
552 | if (val < 0) | |
553 | err = -EINVAL; | |
554 | else | |
555 | dp->dccps_tx_qlen = val; | |
556 | break; | |
a84ffe43 ACM |
557 | default: |
558 | err = -ENOPROTOOPT; | |
559 | break; | |
560 | } | |
410e27a4 | 561 | release_sock(sk); |
19102996 | 562 | |
a84ffe43 | 563 | return err; |
7c657876 ACM |
564 | } |
565 | ||
3fdadf7d | 566 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 567 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
568 | { |
569 | if (level != SOL_DCCP) | |
570 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, | |
571 | optname, optval, | |
572 | optlen); | |
573 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); | |
574 | } | |
543d9cfe | 575 | |
f21e68ca ACM |
576 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
577 | ||
3fdadf7d DM |
578 | #ifdef CONFIG_COMPAT |
579 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 580 | char __user *optval, unsigned int optlen) |
3fdadf7d | 581 | { |
dec73ff0 ACM |
582 | if (level != SOL_DCCP) |
583 | return inet_csk_compat_setsockopt(sk, level, optname, | |
584 | optval, optlen); | |
3fdadf7d DM |
585 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
586 | } | |
543d9cfe | 587 | |
3fdadf7d DM |
588 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
589 | #endif | |
590 | ||
67e6b629 | 591 | static int dccp_getsockopt_service(struct sock *sk, int len, |
60fe62e7 | 592 | __be32 __user *optval, |
67e6b629 ACM |
593 | int __user *optlen) |
594 | { | |
595 | const struct dccp_sock *dp = dccp_sk(sk); | |
596 | const struct dccp_service_list *sl; | |
597 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
598 | ||
599 | lock_sock(sk); | |
67e6b629 ACM |
600 | if ((sl = dp->dccps_service_list) != NULL) { |
601 | slen = sl->dccpsl_nr * sizeof(u32); | |
602 | total_len += slen; | |
603 | } | |
604 | ||
605 | err = -EINVAL; | |
606 | if (total_len > len) | |
607 | goto out; | |
608 | ||
609 | err = 0; | |
610 | if (put_user(total_len, optlen) || | |
611 | put_user(dp->dccps_service, optval) || | |
612 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
613 | err = -EFAULT; | |
614 | out: | |
615 | release_sock(sk); | |
616 | return err; | |
617 | } | |
618 | ||
3fdadf7d | 619 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 620 | char __user *optval, int __user *optlen) |
7c657876 | 621 | { |
a84ffe43 ACM |
622 | struct dccp_sock *dp; |
623 | int val, len; | |
7c657876 | 624 | |
a84ffe43 ACM |
625 | if (get_user(len, optlen)) |
626 | return -EFAULT; | |
627 | ||
39ebc027 | 628 | if (len < (int)sizeof(int)) |
a84ffe43 ACM |
629 | return -EINVAL; |
630 | ||
631 | dp = dccp_sk(sk); | |
632 | ||
633 | switch (optname) { | |
634 | case DCCP_SOCKOPT_PACKET_SIZE: | |
5aed3243 | 635 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
841bac1d | 636 | return 0; |
88f964db ACM |
637 | case DCCP_SOCKOPT_SERVICE: |
638 | return dccp_getsockopt_service(sk, len, | |
60fe62e7 | 639 | (__be32 __user *)optval, optlen); |
7c559a9e GR |
640 | case DCCP_SOCKOPT_GET_CUR_MPS: |
641 | val = dp->dccps_mss_cache; | |
7c559a9e | 642 | break; |
d90ebcbf GR |
643 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
644 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); | |
71c262a3 GR |
645 | case DCCP_SOCKOPT_TX_CCID: |
646 | val = ccid_get_current_tx_ccid(dp); | |
647 | if (val < 0) | |
648 | return -ENOPROTOOPT; | |
649 | break; | |
650 | case DCCP_SOCKOPT_RX_CCID: | |
651 | val = ccid_get_current_rx_ccid(dp); | |
652 | if (val < 0) | |
653 | return -ENOPROTOOPT; | |
654 | break; | |
b8599d20 GR |
655 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
656 | val = dp->dccps_server_timewait; | |
b8599d20 | 657 | break; |
6f4e5fff GR |
658 | case DCCP_SOCKOPT_SEND_CSCOV: |
659 | val = dp->dccps_pcslen; | |
660 | break; | |
661 | case DCCP_SOCKOPT_RECV_CSCOV: | |
662 | val = dp->dccps_pcrlen; | |
663 | break; | |
871a2c16 TG |
664 | case DCCP_SOCKOPT_QPOLICY_ID: |
665 | val = dp->dccps_qpolicy; | |
666 | break; | |
667 | case DCCP_SOCKOPT_QPOLICY_TXQLEN: | |
668 | val = dp->dccps_tx_qlen; | |
669 | break; | |
88f964db ACM |
670 | case 128 ... 191: |
671 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
672 | len, (u32 __user *)optval, optlen); | |
673 | case 192 ... 255: | |
674 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
675 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
676 | default: |
677 | return -ENOPROTOOPT; | |
678 | } | |
679 | ||
79133506 | 680 | len = sizeof(val); |
a84ffe43 ACM |
681 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
682 | return -EFAULT; | |
683 | ||
684 | return 0; | |
7c657876 ACM |
685 | } |
686 | ||
3fdadf7d DM |
687 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
688 | char __user *optval, int __user *optlen) | |
689 | { | |
690 | if (level != SOL_DCCP) | |
691 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, | |
692 | optname, optval, | |
693 | optlen); | |
694 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); | |
695 | } | |
543d9cfe | 696 | |
f21e68ca ACM |
697 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
698 | ||
3fdadf7d DM |
699 | #ifdef CONFIG_COMPAT |
700 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
543d9cfe | 701 | char __user *optval, int __user *optlen) |
3fdadf7d | 702 | { |
dec73ff0 ACM |
703 | if (level != SOL_DCCP) |
704 | return inet_csk_compat_getsockopt(sk, level, optname, | |
705 | optval, optlen); | |
3fdadf7d DM |
706 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
707 | } | |
543d9cfe | 708 | |
3fdadf7d DM |
709 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
710 | #endif | |
711 | ||
871a2c16 TG |
712 | static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb) |
713 | { | |
f95b414e | 714 | struct cmsghdr *cmsg; |
871a2c16 TG |
715 | |
716 | /* | |
717 | * Assign an (opaque) qpolicy priority value to skb->priority. | |
718 | * | |
719 | * We are overloading this skb field for use with the qpolicy subystem. | |
720 | * The skb->priority is normally used for the SO_PRIORITY option, which | |
721 | * is initialised from sk_priority. Since the assignment of sk_priority | |
722 | * to skb->priority happens later (on layer 3), we overload this field | |
723 | * for use with queueing priorities as long as the skb is on layer 4. | |
724 | * The default priority value (if nothing is set) is 0. | |
725 | */ | |
726 | skb->priority = 0; | |
727 | ||
f95b414e | 728 | for_each_cmsghdr(cmsg, msg) { |
871a2c16 TG |
729 | if (!CMSG_OK(msg, cmsg)) |
730 | return -EINVAL; | |
731 | ||
732 | if (cmsg->cmsg_level != SOL_DCCP) | |
733 | continue; | |
734 | ||
04910265 TG |
735 | if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX && |
736 | !dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type)) | |
737 | return -EINVAL; | |
738 | ||
871a2c16 TG |
739 | switch (cmsg->cmsg_type) { |
740 | case DCCP_SCM_PRIORITY: | |
741 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32))) | |
742 | return -EINVAL; | |
743 | skb->priority = *(__u32 *)CMSG_DATA(cmsg); | |
744 | break; | |
745 | default: | |
746 | return -EINVAL; | |
747 | } | |
748 | } | |
749 | return 0; | |
750 | } | |
751 | ||
1b784140 | 752 | int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
7c657876 ACM |
753 | { |
754 | const struct dccp_sock *dp = dccp_sk(sk); | |
755 | const int flags = msg->msg_flags; | |
756 | const int noblock = flags & MSG_DONTWAIT; | |
757 | struct sk_buff *skb; | |
758 | int rc, size; | |
759 | long timeo; | |
760 | ||
ee549be6 MH |
761 | trace_dccp_probe(sk, len); |
762 | ||
7c657876 ACM |
763 | if (len > dp->dccps_mss_cache) |
764 | return -EMSGSIZE; | |
765 | ||
766 | lock_sock(sk); | |
b1308dc0 | 767 | |
871a2c16 | 768 | if (dccp_qpolicy_full(sk)) { |
b1308dc0 IM |
769 | rc = -EAGAIN; |
770 | goto out_release; | |
771 | } | |
772 | ||
27258ee5 | 773 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
774 | |
775 | /* | |
776 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
777 | * so that the trick in dccp_rcv_request_sent_state_process. | |
778 | */ | |
779 | /* Wait for a connection to finish. */ | |
cecd8d0e | 780 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
7c657876 | 781 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
27258ee5 | 782 | goto out_release; |
7c657876 ACM |
783 | |
784 | size = sk->sk_prot->max_header + len; | |
785 | release_sock(sk); | |
786 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
787 | lock_sock(sk); | |
7c657876 ACM |
788 | if (skb == NULL) |
789 | goto out_release; | |
790 | ||
67f93df7 AK |
791 | if (sk->sk_state == DCCP_CLOSED) { |
792 | rc = -ENOTCONN; | |
793 | goto out_discard; | |
794 | } | |
795 | ||
7c657876 | 796 | skb_reserve(skb, sk->sk_prot->max_header); |
6ce8e9ce | 797 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
27258ee5 ACM |
798 | if (rc != 0) |
799 | goto out_discard; | |
800 | ||
871a2c16 TG |
801 | rc = dccp_msghdr_parse(msg, skb); |
802 | if (rc != 0) | |
803 | goto out_discard; | |
804 | ||
805 | dccp_qpolicy_push(sk, skb); | |
b1fcf55e GR |
806 | /* |
807 | * The xmit_timer is set if the TX CCID is rate-based and will expire | |
808 | * when congestion control permits to release further packets into the | |
809 | * network. Window-based CCIDs do not use this timer. | |
810 | */ | |
811 | if (!timer_pending(&dp->dccps_xmit_timer)) | |
812 | dccp_write_xmit(sk); | |
7c657876 ACM |
813 | out_release: |
814 | release_sock(sk); | |
815 | return rc ? : len; | |
27258ee5 ACM |
816 | out_discard: |
817 | kfree_skb(skb); | |
7c657876 | 818 | goto out_release; |
7c657876 ACM |
819 | } |
820 | ||
f21e68ca ACM |
821 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
822 | ||
1b784140 YX |
823 | int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, |
824 | int flags, int *addr_len) | |
7c657876 ACM |
825 | { |
826 | const struct dccp_hdr *dh; | |
7c657876 ACM |
827 | long timeo; |
828 | ||
829 | lock_sock(sk); | |
830 | ||
531669a0 ACM |
831 | if (sk->sk_state == DCCP_LISTEN) { |
832 | len = -ENOTCONN; | |
7c657876 | 833 | goto out; |
7c657876 | 834 | } |
7c657876 | 835 | |
531669a0 | 836 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
837 | |
838 | do { | |
531669a0 | 839 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 840 | |
531669a0 ACM |
841 | if (skb == NULL) |
842 | goto verify_sock_status; | |
7c657876 | 843 | |
531669a0 | 844 | dh = dccp_hdr(skb); |
7c657876 | 845 | |
0c869620 GR |
846 | switch (dh->dccph_type) { |
847 | case DCCP_PKT_DATA: | |
848 | case DCCP_PKT_DATAACK: | |
531669a0 | 849 | goto found_ok_skb; |
7c657876 | 850 | |
0c869620 GR |
851 | case DCCP_PKT_CLOSE: |
852 | case DCCP_PKT_CLOSEREQ: | |
853 | if (!(flags & MSG_PEEK)) | |
854 | dccp_finish_passive_close(sk); | |
855 | /* fall through */ | |
856 | case DCCP_PKT_RESET: | |
857 | dccp_pr_debug("found fin (%s) ok!\n", | |
858 | dccp_packet_name(dh->dccph_type)); | |
531669a0 ACM |
859 | len = 0; |
860 | goto found_fin_ok; | |
0c869620 GR |
861 | default: |
862 | dccp_pr_debug("packet_type=%s\n", | |
863 | dccp_packet_name(dh->dccph_type)); | |
7bced397 | 864 | sk_eat_skb(sk, skb); |
531669a0 | 865 | } |
531669a0 ACM |
866 | verify_sock_status: |
867 | if (sock_flag(sk, SOCK_DONE)) { | |
868 | len = 0; | |
7c657876 | 869 | break; |
531669a0 | 870 | } |
7c657876 | 871 | |
531669a0 ACM |
872 | if (sk->sk_err) { |
873 | len = sock_error(sk); | |
874 | break; | |
875 | } | |
7c657876 | 876 | |
531669a0 ACM |
877 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
878 | len = 0; | |
879 | break; | |
880 | } | |
7c657876 | 881 | |
531669a0 ACM |
882 | if (sk->sk_state == DCCP_CLOSED) { |
883 | if (!sock_flag(sk, SOCK_DONE)) { | |
884 | /* This occurs when user tries to read | |
885 | * from never connected socket. | |
886 | */ | |
887 | len = -ENOTCONN; | |
7c657876 ACM |
888 | break; |
889 | } | |
531669a0 ACM |
890 | len = 0; |
891 | break; | |
7c657876 ACM |
892 | } |
893 | ||
531669a0 ACM |
894 | if (!timeo) { |
895 | len = -EAGAIN; | |
896 | break; | |
897 | } | |
7c657876 | 898 | |
531669a0 ACM |
899 | if (signal_pending(current)) { |
900 | len = sock_intr_errno(timeo); | |
901 | break; | |
902 | } | |
7c657876 | 903 | |
dfbafc99 | 904 | sk_wait_data(sk, &timeo, NULL); |
7c657876 | 905 | continue; |
7c657876 | 906 | found_ok_skb: |
531669a0 ACM |
907 | if (len > skb->len) |
908 | len = skb->len; | |
909 | else if (len < skb->len) | |
910 | msg->msg_flags |= MSG_TRUNC; | |
911 | ||
51f3d02b | 912 | if (skb_copy_datagram_msg(skb, 0, msg, len)) { |
531669a0 ACM |
913 | /* Exception. Bailout! */ |
914 | len = -EFAULT; | |
915 | break; | |
7c657876 | 916 | } |
55d95590 GR |
917 | if (flags & MSG_TRUNC) |
918 | len = skb->len; | |
7c657876 ACM |
919 | found_fin_ok: |
920 | if (!(flags & MSG_PEEK)) | |
7bced397 | 921 | sk_eat_skb(sk, skb); |
7c657876 | 922 | break; |
531669a0 | 923 | } while (1); |
7c657876 ACM |
924 | out: |
925 | release_sock(sk); | |
531669a0 | 926 | return len; |
7c657876 ACM |
927 | } |
928 | ||
f21e68ca ACM |
929 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
930 | ||
931 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
932 | { |
933 | struct sock *sk = sock->sk; | |
934 | unsigned char old_state; | |
935 | int err; | |
936 | ||
937 | lock_sock(sk); | |
938 | ||
939 | err = -EINVAL; | |
940 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
941 | goto out; | |
942 | ||
943 | old_state = sk->sk_state; | |
944 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
945 | goto out; | |
946 | ||
099ecf59 | 947 | WRITE_ONCE(sk->sk_max_ack_backlog, backlog); |
7c657876 ACM |
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 | } | |
7c657876 ACM |
960 | err = 0; |
961 | ||
962 | out: | |
963 | release_sock(sk); | |
964 | return err; | |
965 | } | |
966 | ||
f21e68ca ACM |
967 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
968 | ||
0c869620 | 969 | static void dccp_terminate_connection(struct sock *sk) |
7c657876 | 970 | { |
0c869620 | 971 | u8 next_state = DCCP_CLOSED; |
7c657876 | 972 | |
0c869620 GR |
973 | switch (sk->sk_state) { |
974 | case DCCP_PASSIVE_CLOSE: | |
975 | case DCCP_PASSIVE_CLOSEREQ: | |
976 | dccp_finish_passive_close(sk); | |
977 | break; | |
978 | case DCCP_PARTOPEN: | |
979 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); | |
980 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
981 | /* fall through */ | |
982 | case DCCP_OPEN: | |
983 | dccp_send_close(sk, 1); | |
7c657876 | 984 | |
b8599d20 GR |
985 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
986 | !dccp_sk(sk)->dccps_server_timewait) | |
0c869620 GR |
987 | next_state = DCCP_ACTIVE_CLOSEREQ; |
988 | else | |
989 | next_state = DCCP_CLOSING; | |
990 | /* fall through */ | |
991 | default: | |
992 | dccp_set_state(sk, next_state); | |
993 | } | |
7c657876 ACM |
994 | } |
995 | ||
996 | void dccp_close(struct sock *sk, long timeout) | |
997 | { | |
97e5848d | 998 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 | 999 | struct sk_buff *skb; |
d83bd95b | 1000 | u32 data_was_unread = 0; |
134af346 | 1001 | int state; |
7c657876 ACM |
1002 | |
1003 | lock_sock(sk); | |
1004 | ||
1005 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1006 | ||
1007 | if (sk->sk_state == DCCP_LISTEN) { | |
1008 | dccp_set_state(sk, DCCP_CLOSED); | |
1009 | ||
1010 | /* Special case. */ | |
1011 | inet_csk_listen_stop(sk); | |
1012 | ||
1013 | goto adjudge_to_death; | |
1014 | } | |
1015 | ||
97e5848d IM |
1016 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
1017 | ||
7c657876 ACM |
1018 | /* |
1019 | * We need to flush the recv. buffs. We do this only on the | |
1020 | * descriptor close, not protocol-sourced closes, because the | |
1021 | *reader process may not have drained the data yet! | |
1022 | */ | |
7c657876 | 1023 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
d83bd95b | 1024 | data_was_unread += skb->len; |
7c657876 ACM |
1025 | __kfree_skb(skb); |
1026 | } | |
1027 | ||
346da62c ED |
1028 | /* If socket has been already reset kill it. */ |
1029 | if (sk->sk_state == DCCP_CLOSED) | |
1030 | goto adjudge_to_death; | |
1031 | ||
d83bd95b GR |
1032 | if (data_was_unread) { |
1033 | /* Unread data was tossed, send an appropriate Reset Code */ | |
2f34b329 | 1034 | DCCP_WARN("ABORT with %u bytes unread\n", data_was_unread); |
d83bd95b GR |
1035 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
1036 | dccp_set_state(sk, DCCP_CLOSED); | |
1037 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
7c657876 ACM |
1038 | /* Check zero linger _after_ checking for unread data. */ |
1039 | sk->sk_prot->disconnect(sk, 0); | |
0c869620 | 1040 | } else if (sk->sk_state != DCCP_CLOSED) { |
b1fcf55e GR |
1041 | /* |
1042 | * Normal connection termination. May need to wait if there are | |
1043 | * still packets in the TX queue that are delayed by the CCID. | |
1044 | */ | |
1045 | dccp_flush_write_queue(sk, &timeout); | |
0c869620 | 1046 | dccp_terminate_connection(sk); |
7c657876 ACM |
1047 | } |
1048 | ||
b1fcf55e GR |
1049 | /* |
1050 | * Flush write queue. This may be necessary in several cases: | |
1051 | * - we have been closed by the peer but still have application data; | |
1052 | * - abortive termination (unread data or zero linger time), | |
1053 | * - normal termination but queue could not be flushed within time limit | |
1054 | */ | |
1055 | __skb_queue_purge(&sk->sk_write_queue); | |
1056 | ||
7c657876 ACM |
1057 | sk_stream_wait_close(sk, timeout); |
1058 | ||
1059 | adjudge_to_death: | |
134af346 HX |
1060 | state = sk->sk_state; |
1061 | sock_hold(sk); | |
1062 | sock_orphan(sk); | |
134af346 | 1063 | |
7ad07e7c ACM |
1064 | /* |
1065 | * It is the last release_sock in its life. It will remove backlog. | |
1066 | */ | |
7c657876 ACM |
1067 | release_sock(sk); |
1068 | /* | |
1069 | * Now socket is owned by kernel and we acquire BH lock | |
1070 | * to finish close. No need to check for user refs. | |
1071 | */ | |
1072 | local_bh_disable(); | |
1073 | bh_lock_sock(sk); | |
547b792c | 1074 | WARN_ON(sock_owned_by_user(sk)); |
7c657876 | 1075 | |
eb4dea58 HX |
1076 | percpu_counter_inc(sk->sk_prot->orphan_count); |
1077 | ||
134af346 HX |
1078 | /* Have we already been destroyed by a softirq or backlog? */ |
1079 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) | |
1080 | goto out; | |
7ad07e7c | 1081 | |
7c657876 ACM |
1082 | if (sk->sk_state == DCCP_CLOSED) |
1083 | inet_csk_destroy_sock(sk); | |
1084 | ||
1085 | /* Otherwise, socket is reprieved until protocol close. */ | |
1086 | ||
134af346 | 1087 | out: |
7c657876 ACM |
1088 | bh_unlock_sock(sk); |
1089 | local_bh_enable(); | |
1090 | sock_put(sk); | |
1091 | } | |
1092 | ||
f21e68ca ACM |
1093 | EXPORT_SYMBOL_GPL(dccp_close); |
1094 | ||
7c657876 ACM |
1095 | void dccp_shutdown(struct sock *sk, int how) |
1096 | { | |
8e8c71f1 | 1097 | dccp_pr_debug("called shutdown(%x)\n", how); |
7c657876 ACM |
1098 | } |
1099 | ||
f21e68ca ACM |
1100 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
1101 | ||
0c5b8a46 | 1102 | static inline int __init dccp_mib_init(void) |
7c657876 | 1103 | { |
698365fa WC |
1104 | dccp_statistics = alloc_percpu(struct dccp_mib); |
1105 | if (!dccp_statistics) | |
1106 | return -ENOMEM; | |
1107 | return 0; | |
7c657876 ACM |
1108 | } |
1109 | ||
24e8b7e4 | 1110 | static inline void dccp_mib_exit(void) |
46f09ffa | 1111 | { |
698365fa | 1112 | free_percpu(dccp_statistics); |
46f09ffa ACM |
1113 | } |
1114 | ||
7c657876 ACM |
1115 | static int thash_entries; |
1116 | module_param(thash_entries, int, 0444); | |
1117 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
1118 | ||
a1d3a355 | 1119 | #ifdef CONFIG_IP_DCCP_DEBUG |
eb939922 | 1120 | bool dccp_debug; |
43264991 | 1121 | module_param(dccp_debug, bool, 0644); |
7c657876 | 1122 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
f21e68ca ACM |
1123 | |
1124 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 1125 | #endif |
7c657876 ACM |
1126 | |
1127 | static int __init dccp_init(void) | |
1128 | { | |
1129 | unsigned long goal; | |
ca79b0c2 | 1130 | unsigned long nr_pages = totalram_pages(); |
7c657876 | 1131 | int ehash_order, bhash_order, i; |
dd24c001 | 1132 | int rc; |
7c657876 | 1133 | |
028b0275 | 1134 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
c593642c | 1135 | sizeof_field(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; |
5caea4ea | 1139 | inet_hashinfo_init(&dccp_hashinfo); |
c92c81df PO |
1140 | rc = inet_hashinfo2_init_mod(&dccp_hashinfo); |
1141 | if (rc) | |
1142 | goto out_fail; | |
1143 | rc = -ENOBUFS; | |
7690af3f ACM |
1144 | dccp_hashinfo.bind_bucket_cachep = |
1145 | kmem_cache_create("dccp_bind_bucket", | |
1146 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 1147 | SLAB_HWCACHE_ALIGN, NULL); |
7c657876 | 1148 | if (!dccp_hashinfo.bind_bucket_cachep) |
dd24c001 | 1149 | goto out_free_percpu; |
7c657876 ACM |
1150 | |
1151 | /* | |
1152 | * Size and allocate the main established and bind bucket | |
1153 | * hash tables. | |
1154 | * | |
1155 | * The methodology is similar to that of the buffer cache. | |
1156 | */ | |
3d6357de AK |
1157 | if (nr_pages >= (128 * 1024)) |
1158 | goal = nr_pages >> (21 - PAGE_SHIFT); | |
7c657876 | 1159 | else |
3d6357de | 1160 | goal = nr_pages >> (23 - PAGE_SHIFT); |
7c657876 ACM |
1161 | |
1162 | if (thash_entries) | |
7690af3f ACM |
1163 | goal = (thash_entries * |
1164 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
1165 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
1166 | ; | |
1167 | do { | |
f373b53b | 1168 | unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE / |
7c657876 | 1169 | sizeof(struct inet_ehash_bucket); |
f373b53b ED |
1170 | |
1171 | while (hash_size & (hash_size - 1)) | |
1172 | hash_size--; | |
1173 | dccp_hashinfo.ehash_mask = hash_size - 1; | |
7c657876 | 1174 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) |
1c29b3ff | 1175 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order); |
7c657876 ACM |
1176 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); |
1177 | ||
1178 | if (!dccp_hashinfo.ehash) { | |
59348b19 | 1179 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
7c657876 ACM |
1180 | goto out_free_bind_bucket_cachep; |
1181 | } | |
1182 | ||
05dbc7b5 | 1183 | for (i = 0; i <= dccp_hashinfo.ehash_mask; i++) |
3ab5aee7 | 1184 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); |
7c657876 | 1185 | |
230140cf ED |
1186 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
1187 | goto out_free_dccp_ehash; | |
1188 | ||
7c657876 ACM |
1189 | bhash_order = ehash_order; |
1190 | ||
1191 | do { | |
1192 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
1193 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
1194 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
1195 | bhash_order > 0) | |
7c657876 ACM |
1196 | continue; |
1197 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
1c29b3ff | 1198 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, bhash_order); |
7c657876 ACM |
1199 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); |
1200 | ||
1201 | if (!dccp_hashinfo.bhash) { | |
59348b19 | 1202 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
230140cf | 1203 | goto out_free_dccp_locks; |
7c657876 ACM |
1204 | } |
1205 | ||
1206 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
1207 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
1208 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
1209 | } | |
1210 | ||
46f09ffa | 1211 | rc = dccp_mib_init(); |
fa23e2ec | 1212 | if (rc) |
7c657876 ACM |
1213 | goto out_free_dccp_bhash; |
1214 | ||
9b07ef5d | 1215 | rc = dccp_ackvec_init(); |
7c657876 | 1216 | if (rc) |
b61fafc4 | 1217 | goto out_free_dccp_mib; |
9b07ef5d | 1218 | |
e55d912f | 1219 | rc = dccp_sysctl_init(); |
9b07ef5d ACM |
1220 | if (rc) |
1221 | goto out_ackvec_exit; | |
4c70f383 | 1222 | |
ddebc973 GR |
1223 | rc = ccid_initialize_builtins(); |
1224 | if (rc) | |
1225 | goto out_sysctl_exit; | |
1226 | ||
4c70f383 | 1227 | dccp_timestamping_init(); |
d14a0ebd GR |
1228 | |
1229 | return 0; | |
1230 | ||
ddebc973 GR |
1231 | out_sysctl_exit: |
1232 | dccp_sysctl_exit(); | |
9b07ef5d ACM |
1233 | out_ackvec_exit: |
1234 | dccp_ackvec_exit(); | |
b61fafc4 | 1235 | out_free_dccp_mib: |
46f09ffa | 1236 | dccp_mib_exit(); |
7c657876 ACM |
1237 | out_free_dccp_bhash: |
1238 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
230140cf ED |
1239 | out_free_dccp_locks: |
1240 | inet_ehash_locks_free(&dccp_hashinfo); | |
7c657876 ACM |
1241 | out_free_dccp_ehash: |
1242 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
7c657876 ACM |
1243 | out_free_bind_bucket_cachep: |
1244 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
dd24c001 ED |
1245 | out_free_percpu: |
1246 | percpu_counter_destroy(&dccp_orphan_count); | |
d14a0ebd GR |
1247 | out_fail: |
1248 | dccp_hashinfo.bhash = NULL; | |
1249 | dccp_hashinfo.ehash = NULL; | |
1250 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
1251 | return rc; | |
7c657876 ACM |
1252 | } |
1253 | ||
7c657876 ACM |
1254 | static void __exit dccp_fini(void) |
1255 | { | |
ddebc973 | 1256 | ccid_cleanup_builtins(); |
46f09ffa | 1257 | dccp_mib_exit(); |
725ba8ee ACM |
1258 | free_pages((unsigned long)dccp_hashinfo.bhash, |
1259 | get_order(dccp_hashinfo.bhash_size * | |
1260 | sizeof(struct inet_bind_hashbucket))); | |
1261 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
f373b53b | 1262 | get_order((dccp_hashinfo.ehash_mask + 1) * |
725ba8ee | 1263 | sizeof(struct inet_ehash_bucket))); |
230140cf | 1264 | inet_ehash_locks_free(&dccp_hashinfo); |
7c657876 | 1265 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
9b07ef5d | 1266 | dccp_ackvec_exit(); |
e55d912f | 1267 | dccp_sysctl_exit(); |
476181cb | 1268 | percpu_counter_destroy(&dccp_orphan_count); |
7c657876 ACM |
1269 | } |
1270 | ||
1271 | module_init(dccp_init); | |
1272 | module_exit(dccp_fini); | |
1273 | ||
7c657876 ACM |
1274 | MODULE_LICENSE("GPL"); |
1275 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1276 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |