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Commit | Line | Data |
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7c657876 ACM |
1 | /* |
2 | * net/dccp/proto.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/dccp.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/in.h> | |
21 | #include <linux/if_arp.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/random.h> | |
24 | #include <net/checksum.h> | |
25 | ||
26 | #include <net/inet_common.h> | |
27 | #include <net/ip.h> | |
28 | #include <net/protocol.h> | |
29 | #include <net/sock.h> | |
30 | #include <net/xfrm.h> | |
31 | ||
32 | #include <asm/semaphore.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/timer.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/poll.h> | |
37 | #include <linux/dccp.h> | |
38 | ||
39 | #include "ccid.h" | |
40 | #include "dccp.h" | |
41 | ||
ba89966c | 42 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 ACM |
43 | |
44 | atomic_t dccp_orphan_count = ATOMIC_INIT(0); | |
45 | ||
46 | static struct net_protocol dccp_protocol = { | |
47 | .handler = dccp_v4_rcv, | |
48 | .err_handler = dccp_v4_err, | |
a516b049 | 49 | .no_policy = 1, |
7c657876 ACM |
50 | }; |
51 | ||
52 | const char *dccp_packet_name(const int type) | |
53 | { | |
54 | static const char *dccp_packet_names[] = { | |
55 | [DCCP_PKT_REQUEST] = "REQUEST", | |
56 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
57 | [DCCP_PKT_DATA] = "DATA", | |
58 | [DCCP_PKT_ACK] = "ACK", | |
59 | [DCCP_PKT_DATAACK] = "DATAACK", | |
60 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
61 | [DCCP_PKT_CLOSE] = "CLOSE", | |
62 | [DCCP_PKT_RESET] = "RESET", | |
63 | [DCCP_PKT_SYNC] = "SYNC", | |
64 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
65 | }; | |
66 | ||
67 | if (type >= DCCP_NR_PKT_TYPES) | |
68 | return "INVALID"; | |
69 | else | |
70 | return dccp_packet_names[type]; | |
71 | } | |
72 | ||
73 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
74 | ||
75 | const char *dccp_state_name(const int state) | |
76 | { | |
77 | static char *dccp_state_names[] = { | |
78 | [DCCP_OPEN] = "OPEN", | |
79 | [DCCP_REQUESTING] = "REQUESTING", | |
80 | [DCCP_PARTOPEN] = "PARTOPEN", | |
81 | [DCCP_LISTEN] = "LISTEN", | |
82 | [DCCP_RESPOND] = "RESPOND", | |
83 | [DCCP_CLOSING] = "CLOSING", | |
84 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
85 | [DCCP_CLOSED] = "CLOSED", | |
86 | }; | |
87 | ||
88 | if (state >= DCCP_MAX_STATES) | |
89 | return "INVALID STATE!"; | |
90 | else | |
91 | return dccp_state_names[state]; | |
92 | } | |
93 | ||
94 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
95 | ||
96 | static inline int dccp_listen_start(struct sock *sk) | |
97 | { | |
67e6b629 ACM |
98 | struct dccp_sock *dp = dccp_sk(sk); |
99 | ||
100 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
101 | /* | |
102 | * Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE) | |
103 | * before calling listen() | |
104 | */ | |
105 | if (dccp_service_not_initialized(sk)) | |
106 | return -EPROTO; | |
7c657876 ACM |
107 | return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); |
108 | } | |
109 | ||
110 | int dccp_disconnect(struct sock *sk, int flags) | |
111 | { | |
112 | struct inet_connection_sock *icsk = inet_csk(sk); | |
113 | struct inet_sock *inet = inet_sk(sk); | |
114 | int err = 0; | |
115 | const int old_state = sk->sk_state; | |
116 | ||
117 | if (old_state != DCCP_CLOSED) | |
118 | dccp_set_state(sk, DCCP_CLOSED); | |
119 | ||
120 | /* ABORT function of RFC793 */ | |
121 | if (old_state == DCCP_LISTEN) { | |
122 | inet_csk_listen_stop(sk); | |
123 | /* FIXME: do the active reset thing */ | |
124 | } else if (old_state == DCCP_REQUESTING) | |
125 | sk->sk_err = ECONNRESET; | |
126 | ||
127 | dccp_clear_xmit_timers(sk); | |
128 | __skb_queue_purge(&sk->sk_receive_queue); | |
129 | if (sk->sk_send_head != NULL) { | |
130 | __kfree_skb(sk->sk_send_head); | |
131 | sk->sk_send_head = NULL; | |
132 | } | |
133 | ||
134 | inet->dport = 0; | |
135 | ||
136 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
137 | inet_reset_saddr(sk); | |
138 | ||
139 | sk->sk_shutdown = 0; | |
140 | sock_reset_flag(sk, SOCK_DONE); | |
141 | ||
142 | icsk->icsk_backoff = 0; | |
143 | inet_csk_delack_init(sk); | |
144 | __sk_dst_reset(sk); | |
145 | ||
146 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
147 | ||
148 | sk->sk_error_report(sk); | |
149 | return err; | |
150 | } | |
151 | ||
331968bd ACM |
152 | /* |
153 | * Wait for a DCCP event. | |
154 | * | |
155 | * Note that we don't need to lock the socket, as the upper poll layers | |
156 | * take care of normal races (between the test and the event) and we don't | |
157 | * go look at any of the socket buffers directly. | |
158 | */ | |
159 | static unsigned int dccp_poll(struct file *file, struct socket *sock, | |
160 | poll_table *wait) | |
161 | { | |
162 | unsigned int mask; | |
163 | struct sock *sk = sock->sk; | |
164 | ||
165 | poll_wait(file, sk->sk_sleep, wait); | |
166 | if (sk->sk_state == DCCP_LISTEN) | |
167 | return inet_csk_listen_poll(sk); | |
168 | ||
169 | /* Socket is not locked. We are protected from async events | |
170 | by poll logic and correct handling of state changes | |
171 | made by another threads is impossible in any case. | |
172 | */ | |
173 | ||
174 | mask = 0; | |
175 | if (sk->sk_err) | |
176 | mask = POLLERR; | |
177 | ||
178 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
179 | mask |= POLLHUP; | |
180 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
181 | mask |= POLLIN | POLLRDNORM; | |
182 | ||
183 | /* Connected? */ | |
184 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
185 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
186 | mask |= POLLIN | POLLRDNORM; | |
187 | ||
188 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
189 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
190 | mask |= POLLOUT | POLLWRNORM; | |
191 | } else { /* send SIGIO later */ | |
192 | set_bit(SOCK_ASYNC_NOSPACE, | |
193 | &sk->sk_socket->flags); | |
194 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
195 | ||
196 | /* Race breaker. If space is freed after | |
197 | * wspace test but before the flags are set, | |
198 | * IO signal will be lost. | |
199 | */ | |
200 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
201 | mask |= POLLOUT | POLLWRNORM; | |
202 | } | |
203 | } | |
204 | } | |
205 | return mask; | |
206 | } | |
207 | ||
7c657876 ACM |
208 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
209 | { | |
210 | dccp_pr_debug("entry\n"); | |
211 | return -ENOIOCTLCMD; | |
212 | } | |
213 | ||
67e6b629 ACM |
214 | static int dccp_setsockopt_service(struct sock *sk, const u32 service, |
215 | char __user *optval, int optlen) | |
216 | { | |
217 | struct dccp_sock *dp = dccp_sk(sk); | |
218 | struct dccp_service_list *sl = NULL; | |
219 | ||
220 | if (service == DCCP_SERVICE_INVALID_VALUE || | |
221 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) | |
222 | return -EINVAL; | |
223 | ||
224 | if (optlen > sizeof(service)) { | |
225 | sl = kmalloc(optlen, GFP_KERNEL); | |
226 | if (sl == NULL) | |
227 | return -ENOMEM; | |
228 | ||
229 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
230 | if (copy_from_user(sl->dccpsl_list, | |
231 | optval + sizeof(service), | |
232 | optlen - sizeof(service)) || | |
233 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
234 | kfree(sl); | |
235 | return -EFAULT; | |
236 | } | |
237 | } | |
238 | ||
239 | lock_sock(sk); | |
240 | dp->dccps_service = service; | |
241 | ||
a51482bd | 242 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
243 | |
244 | dp->dccps_service_list = sl; | |
245 | release_sock(sk); | |
246 | return 0; | |
247 | } | |
248 | ||
7c657876 | 249 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 250 | char __user *optval, int optlen) |
7c657876 | 251 | { |
a84ffe43 ACM |
252 | struct dccp_sock *dp; |
253 | int err; | |
254 | int val; | |
7c657876 ACM |
255 | |
256 | if (level != SOL_DCCP) | |
57cca05a ACM |
257 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, |
258 | optname, optval, | |
259 | optlen); | |
7c657876 | 260 | |
a84ffe43 ACM |
261 | if (optlen < sizeof(int)) |
262 | return -EINVAL; | |
263 | ||
264 | if (get_user(val, (int __user *)optval)) | |
265 | return -EFAULT; | |
266 | ||
67e6b629 ACM |
267 | if (optname == DCCP_SOCKOPT_SERVICE) |
268 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 269 | |
67e6b629 | 270 | lock_sock(sk); |
a84ffe43 ACM |
271 | dp = dccp_sk(sk); |
272 | err = 0; | |
273 | ||
274 | switch (optname) { | |
275 | case DCCP_SOCKOPT_PACKET_SIZE: | |
276 | dp->dccps_packet_size = val; | |
277 | break; | |
278 | default: | |
279 | err = -ENOPROTOOPT; | |
280 | break; | |
281 | } | |
282 | ||
283 | release_sock(sk); | |
284 | return err; | |
7c657876 ACM |
285 | } |
286 | ||
67e6b629 ACM |
287 | static int dccp_getsockopt_service(struct sock *sk, int len, |
288 | u32 __user *optval, | |
289 | int __user *optlen) | |
290 | { | |
291 | const struct dccp_sock *dp = dccp_sk(sk); | |
292 | const struct dccp_service_list *sl; | |
293 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
294 | ||
295 | lock_sock(sk); | |
296 | if (dccp_service_not_initialized(sk)) | |
297 | goto out; | |
298 | ||
299 | if ((sl = dp->dccps_service_list) != NULL) { | |
300 | slen = sl->dccpsl_nr * sizeof(u32); | |
301 | total_len += slen; | |
302 | } | |
303 | ||
304 | err = -EINVAL; | |
305 | if (total_len > len) | |
306 | goto out; | |
307 | ||
308 | err = 0; | |
309 | if (put_user(total_len, optlen) || | |
310 | put_user(dp->dccps_service, optval) || | |
311 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
312 | err = -EFAULT; | |
313 | out: | |
314 | release_sock(sk); | |
315 | return err; | |
316 | } | |
317 | ||
7c657876 | 318 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 319 | char __user *optval, int __user *optlen) |
7c657876 | 320 | { |
a84ffe43 ACM |
321 | struct dccp_sock *dp; |
322 | int val, len; | |
7c657876 ACM |
323 | |
324 | if (level != SOL_DCCP) | |
57cca05a ACM |
325 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, |
326 | optname, optval, | |
327 | optlen); | |
a84ffe43 ACM |
328 | if (get_user(len, optlen)) |
329 | return -EFAULT; | |
330 | ||
88f964db | 331 | if (len < sizeof(int)) |
a84ffe43 ACM |
332 | return -EINVAL; |
333 | ||
334 | dp = dccp_sk(sk); | |
335 | ||
336 | switch (optname) { | |
337 | case DCCP_SOCKOPT_PACKET_SIZE: | |
338 | val = dp->dccps_packet_size; | |
88f964db | 339 | len = sizeof(dp->dccps_packet_size); |
a84ffe43 | 340 | break; |
88f964db ACM |
341 | case DCCP_SOCKOPT_SERVICE: |
342 | return dccp_getsockopt_service(sk, len, | |
343 | (u32 __user *)optval, optlen); | |
344 | case 128 ... 191: | |
345 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
346 | len, (u32 __user *)optval, optlen); | |
347 | case 192 ... 255: | |
348 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
349 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
350 | default: |
351 | return -ENOPROTOOPT; | |
352 | } | |
353 | ||
354 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
355 | return -EFAULT; | |
356 | ||
357 | return 0; | |
7c657876 ACM |
358 | } |
359 | ||
360 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
361 | size_t len) | |
362 | { | |
363 | const struct dccp_sock *dp = dccp_sk(sk); | |
364 | const int flags = msg->msg_flags; | |
365 | const int noblock = flags & MSG_DONTWAIT; | |
366 | struct sk_buff *skb; | |
367 | int rc, size; | |
368 | long timeo; | |
369 | ||
370 | if (len > dp->dccps_mss_cache) | |
371 | return -EMSGSIZE; | |
372 | ||
373 | lock_sock(sk); | |
27258ee5 | 374 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
375 | |
376 | /* | |
377 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
378 | * so that the trick in dccp_rcv_request_sent_state_process. | |
379 | */ | |
380 | /* Wait for a connection to finish. */ | |
381 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING)) | |
382 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) | |
27258ee5 | 383 | goto out_release; |
7c657876 ACM |
384 | |
385 | size = sk->sk_prot->max_header + len; | |
386 | release_sock(sk); | |
387 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
388 | lock_sock(sk); | |
7c657876 ACM |
389 | if (skb == NULL) |
390 | goto out_release; | |
391 | ||
392 | skb_reserve(skb, sk->sk_prot->max_header); | |
393 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
394 | if (rc != 0) |
395 | goto out_discard; | |
396 | ||
d6809c12 | 397 | rc = dccp_write_xmit(sk, skb, &timeo); |
20472af9 ACM |
398 | /* |
399 | * XXX we don't use sk_write_queue, so just discard the packet. | |
400 | * Current plan however is to _use_ sk_write_queue with | |
401 | * an algorith similar to tcp_sendmsg, where the main difference | |
402 | * is that in DCCP we have to respect packet boundaries, so | |
403 | * no coalescing of skbs. | |
404 | * | |
405 | * This bug was _quickly_ found & fixed by just looking at an OSTRA | |
406 | * generated callgraph 8) -acme | |
407 | */ | |
7c657876 ACM |
408 | out_release: |
409 | release_sock(sk); | |
410 | return rc ? : len; | |
27258ee5 ACM |
411 | out_discard: |
412 | kfree_skb(skb); | |
7c657876 | 413 | goto out_release; |
7c657876 ACM |
414 | } |
415 | ||
7c657876 ACM |
416 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
417 | size_t len, int nonblock, int flags, int *addr_len) | |
418 | { | |
419 | const struct dccp_hdr *dh; | |
7c657876 ACM |
420 | long timeo; |
421 | ||
422 | lock_sock(sk); | |
423 | ||
531669a0 ACM |
424 | if (sk->sk_state == DCCP_LISTEN) { |
425 | len = -ENOTCONN; | |
7c657876 | 426 | goto out; |
7c657876 | 427 | } |
7c657876 | 428 | |
531669a0 | 429 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
430 | |
431 | do { | |
531669a0 | 432 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 433 | |
531669a0 ACM |
434 | if (skb == NULL) |
435 | goto verify_sock_status; | |
7c657876 | 436 | |
531669a0 | 437 | dh = dccp_hdr(skb); |
7c657876 | 438 | |
531669a0 ACM |
439 | if (dh->dccph_type == DCCP_PKT_DATA || |
440 | dh->dccph_type == DCCP_PKT_DATAACK) | |
441 | goto found_ok_skb; | |
7c657876 | 442 | |
531669a0 ACM |
443 | if (dh->dccph_type == DCCP_PKT_RESET || |
444 | dh->dccph_type == DCCP_PKT_CLOSE) { | |
445 | dccp_pr_debug("found fin ok!\n"); | |
446 | len = 0; | |
447 | goto found_fin_ok; | |
448 | } | |
449 | dccp_pr_debug("packet_type=%s\n", | |
450 | dccp_packet_name(dh->dccph_type)); | |
451 | sk_eat_skb(sk, skb); | |
452 | verify_sock_status: | |
453 | if (sock_flag(sk, SOCK_DONE)) { | |
454 | len = 0; | |
7c657876 | 455 | break; |
531669a0 | 456 | } |
7c657876 | 457 | |
531669a0 ACM |
458 | if (sk->sk_err) { |
459 | len = sock_error(sk); | |
460 | break; | |
461 | } | |
7c657876 | 462 | |
531669a0 ACM |
463 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
464 | len = 0; | |
465 | break; | |
466 | } | |
7c657876 | 467 | |
531669a0 ACM |
468 | if (sk->sk_state == DCCP_CLOSED) { |
469 | if (!sock_flag(sk, SOCK_DONE)) { | |
470 | /* This occurs when user tries to read | |
471 | * from never connected socket. | |
472 | */ | |
473 | len = -ENOTCONN; | |
7c657876 ACM |
474 | break; |
475 | } | |
531669a0 ACM |
476 | len = 0; |
477 | break; | |
7c657876 ACM |
478 | } |
479 | ||
531669a0 ACM |
480 | if (!timeo) { |
481 | len = -EAGAIN; | |
482 | break; | |
483 | } | |
7c657876 | 484 | |
531669a0 ACM |
485 | if (signal_pending(current)) { |
486 | len = sock_intr_errno(timeo); | |
487 | break; | |
488 | } | |
7c657876 | 489 | |
531669a0 | 490 | sk_wait_data(sk, &timeo); |
7c657876 | 491 | continue; |
7c657876 | 492 | found_ok_skb: |
531669a0 ACM |
493 | if (len > skb->len) |
494 | len = skb->len; | |
495 | else if (len < skb->len) | |
496 | msg->msg_flags |= MSG_TRUNC; | |
497 | ||
498 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
499 | /* Exception. Bailout! */ | |
500 | len = -EFAULT; | |
501 | break; | |
7c657876 | 502 | } |
7c657876 ACM |
503 | found_fin_ok: |
504 | if (!(flags & MSG_PEEK)) | |
505 | sk_eat_skb(sk, skb); | |
506 | break; | |
531669a0 | 507 | } while (1); |
7c657876 ACM |
508 | out: |
509 | release_sock(sk); | |
531669a0 | 510 | return len; |
7c657876 ACM |
511 | } |
512 | ||
513 | static int inet_dccp_listen(struct socket *sock, int backlog) | |
514 | { | |
515 | struct sock *sk = sock->sk; | |
516 | unsigned char old_state; | |
517 | int err; | |
518 | ||
519 | lock_sock(sk); | |
520 | ||
521 | err = -EINVAL; | |
522 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
523 | goto out; | |
524 | ||
525 | old_state = sk->sk_state; | |
526 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
527 | goto out; | |
528 | ||
529 | /* Really, if the socket is already in listen state | |
530 | * we can only allow the backlog to be adjusted. | |
531 | */ | |
532 | if (old_state != DCCP_LISTEN) { | |
533 | /* | |
534 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
535 | * see tcp_listen_start | |
536 | */ | |
537 | err = dccp_listen_start(sk); | |
538 | if (err) | |
539 | goto out; | |
540 | } | |
541 | sk->sk_max_ack_backlog = backlog; | |
542 | err = 0; | |
543 | ||
544 | out: | |
545 | release_sock(sk); | |
546 | return err; | |
547 | } | |
548 | ||
549 | static const unsigned char dccp_new_state[] = { | |
7690af3f ACM |
550 | /* current state: new state: action: */ |
551 | [0] = DCCP_CLOSED, | |
552 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
553 | [DCCP_REQUESTING] = DCCP_CLOSED, | |
554 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
555 | [DCCP_LISTEN] = DCCP_CLOSED, | |
556 | [DCCP_RESPOND] = DCCP_CLOSED, | |
557 | [DCCP_CLOSING] = DCCP_CLOSED, | |
558 | [DCCP_TIME_WAIT] = DCCP_CLOSED, | |
559 | [DCCP_CLOSED] = DCCP_CLOSED, | |
7c657876 ACM |
560 | }; |
561 | ||
562 | static int dccp_close_state(struct sock *sk) | |
563 | { | |
564 | const int next = dccp_new_state[sk->sk_state]; | |
565 | const int ns = next & DCCP_STATE_MASK; | |
566 | ||
567 | if (ns != sk->sk_state) | |
568 | dccp_set_state(sk, ns); | |
569 | ||
570 | return next & DCCP_ACTION_FIN; | |
571 | } | |
572 | ||
573 | void dccp_close(struct sock *sk, long timeout) | |
574 | { | |
575 | struct sk_buff *skb; | |
576 | ||
577 | lock_sock(sk); | |
578 | ||
579 | sk->sk_shutdown = SHUTDOWN_MASK; | |
580 | ||
581 | if (sk->sk_state == DCCP_LISTEN) { | |
582 | dccp_set_state(sk, DCCP_CLOSED); | |
583 | ||
584 | /* Special case. */ | |
585 | inet_csk_listen_stop(sk); | |
586 | ||
587 | goto adjudge_to_death; | |
588 | } | |
589 | ||
590 | /* | |
591 | * We need to flush the recv. buffs. We do this only on the | |
592 | * descriptor close, not protocol-sourced closes, because the | |
593 | *reader process may not have drained the data yet! | |
594 | */ | |
595 | /* FIXME: check for unread data */ | |
596 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
597 | __kfree_skb(skb); | |
598 | } | |
599 | ||
600 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
601 | /* Check zero linger _after_ checking for unread data. */ | |
602 | sk->sk_prot->disconnect(sk, 0); | |
603 | } else if (dccp_close_state(sk)) { | |
7ad07e7c | 604 | dccp_send_close(sk, 1); |
7c657876 ACM |
605 | } |
606 | ||
607 | sk_stream_wait_close(sk, timeout); | |
608 | ||
609 | adjudge_to_death: | |
7ad07e7c ACM |
610 | /* |
611 | * It is the last release_sock in its life. It will remove backlog. | |
612 | */ | |
7c657876 ACM |
613 | release_sock(sk); |
614 | /* | |
615 | * Now socket is owned by kernel and we acquire BH lock | |
616 | * to finish close. No need to check for user refs. | |
617 | */ | |
618 | local_bh_disable(); | |
619 | bh_lock_sock(sk); | |
620 | BUG_TRAP(!sock_owned_by_user(sk)); | |
621 | ||
622 | sock_hold(sk); | |
623 | sock_orphan(sk); | |
7ad07e7c ACM |
624 | |
625 | /* | |
626 | * The last release_sock may have processed the CLOSE or RESET | |
627 | * packet moving sock to CLOSED state, if not we have to fire | |
628 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" | |
629 | * in draft-ietf-dccp-spec-11. -acme | |
630 | */ | |
631 | if (sk->sk_state == DCCP_CLOSING) { | |
632 | /* FIXME: should start at 2 * RTT */ | |
633 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ | |
634 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
635 | inet_csk(sk)->icsk_rto, | |
636 | DCCP_RTO_MAX); | |
637 | #if 0 | |
638 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ | |
7c657876 | 639 | dccp_set_state(sk, DCCP_CLOSED); |
7ad07e7c ACM |
640 | #endif |
641 | } | |
7c657876 | 642 | |
7ad07e7c | 643 | atomic_inc(sk->sk_prot->orphan_count); |
7c657876 ACM |
644 | if (sk->sk_state == DCCP_CLOSED) |
645 | inet_csk_destroy_sock(sk); | |
646 | ||
647 | /* Otherwise, socket is reprieved until protocol close. */ | |
648 | ||
649 | bh_unlock_sock(sk); | |
650 | local_bh_enable(); | |
651 | sock_put(sk); | |
652 | } | |
653 | ||
654 | void dccp_shutdown(struct sock *sk, int how) | |
655 | { | |
656 | dccp_pr_debug("entry\n"); | |
657 | } | |
658 | ||
a1d3a355 | 659 | static struct proto_ops inet_dccp_ops = { |
7c657876 ACM |
660 | .family = PF_INET, |
661 | .owner = THIS_MODULE, | |
662 | .release = inet_release, | |
663 | .bind = inet_bind, | |
664 | .connect = inet_stream_connect, | |
665 | .socketpair = sock_no_socketpair, | |
666 | .accept = inet_accept, | |
667 | .getname = inet_getname, | |
331968bd ACM |
668 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
669 | .poll = dccp_poll, | |
7c657876 | 670 | .ioctl = inet_ioctl, |
7690af3f ACM |
671 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
672 | .listen = inet_dccp_listen, | |
7c657876 ACM |
673 | .shutdown = inet_shutdown, |
674 | .setsockopt = sock_common_setsockopt, | |
675 | .getsockopt = sock_common_getsockopt, | |
676 | .sendmsg = inet_sendmsg, | |
677 | .recvmsg = sock_common_recvmsg, | |
678 | .mmap = sock_no_mmap, | |
679 | .sendpage = sock_no_sendpage, | |
680 | }; | |
681 | ||
682 | extern struct net_proto_family inet_family_ops; | |
683 | ||
684 | static struct inet_protosw dccp_v4_protosw = { | |
685 | .type = SOCK_DCCP, | |
686 | .protocol = IPPROTO_DCCP, | |
34ca6860 | 687 | .prot = &dccp_prot, |
7c657876 ACM |
688 | .ops = &inet_dccp_ops, |
689 | .capability = -1, | |
690 | .no_check = 0, | |
691 | .flags = 0, | |
692 | }; | |
693 | ||
694 | /* | |
695 | * This is the global socket data structure used for responding to | |
696 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
697 | * for this socket at the initialization time. | |
698 | */ | |
699 | struct socket *dccp_ctl_socket; | |
700 | ||
701 | static char dccp_ctl_socket_err_msg[] __initdata = | |
702 | KERN_ERR "DCCP: Failed to create the control socket.\n"; | |
703 | ||
704 | static int __init dccp_ctl_sock_init(void) | |
705 | { | |
706 | int rc = sock_create_kern(PF_INET, SOCK_DCCP, IPPROTO_DCCP, | |
707 | &dccp_ctl_socket); | |
708 | if (rc < 0) | |
709 | printk(dccp_ctl_socket_err_msg); | |
710 | else { | |
711 | dccp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; | |
712 | inet_sk(dccp_ctl_socket->sk)->uc_ttl = -1; | |
713 | ||
714 | /* Unhash it so that IP input processing does not even | |
715 | * see it, we do not wish this socket to see incoming | |
716 | * packets. | |
717 | */ | |
718 | dccp_ctl_socket->sk->sk_prot->unhash(dccp_ctl_socket->sk); | |
719 | } | |
720 | ||
721 | return rc; | |
722 | } | |
723 | ||
725ba8ee ACM |
724 | #ifdef CONFIG_IP_DCCP_UNLOAD_HACK |
725 | void dccp_ctl_sock_exit(void) | |
7c657876 | 726 | { |
5480855b | 727 | if (dccp_ctl_socket != NULL) { |
7c657876 | 728 | sock_release(dccp_ctl_socket); |
5480855b ACM |
729 | dccp_ctl_socket = NULL; |
730 | } | |
7c657876 ACM |
731 | } |
732 | ||
725ba8ee ACM |
733 | EXPORT_SYMBOL_GPL(dccp_ctl_sock_exit); |
734 | #endif | |
735 | ||
7c657876 ACM |
736 | static int __init init_dccp_v4_mibs(void) |
737 | { | |
738 | int rc = -ENOMEM; | |
739 | ||
740 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
741 | if (dccp_statistics[0] == NULL) | |
742 | goto out; | |
743 | ||
744 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
745 | if (dccp_statistics[1] == NULL) | |
746 | goto out_free_one; | |
747 | ||
748 | rc = 0; | |
749 | out: | |
750 | return rc; | |
751 | out_free_one: | |
752 | free_percpu(dccp_statistics[0]); | |
753 | dccp_statistics[0] = NULL; | |
754 | goto out; | |
755 | ||
756 | } | |
757 | ||
758 | static int thash_entries; | |
759 | module_param(thash_entries, int, 0444); | |
760 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
761 | ||
a1d3a355 | 762 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 ACM |
763 | int dccp_debug; |
764 | module_param(dccp_debug, int, 0444); | |
765 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); | |
a1d3a355 | 766 | #endif |
7c657876 ACM |
767 | |
768 | static int __init dccp_init(void) | |
769 | { | |
770 | unsigned long goal; | |
771 | int ehash_order, bhash_order, i; | |
34ca6860 | 772 | int rc = proto_register(&dccp_prot, 1); |
7c657876 ACM |
773 | |
774 | if (rc) | |
775 | goto out; | |
776 | ||
7690af3f ACM |
777 | dccp_hashinfo.bind_bucket_cachep = |
778 | kmem_cache_create("dccp_bind_bucket", | |
779 | sizeof(struct inet_bind_bucket), 0, | |
780 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
7c657876 ACM |
781 | if (!dccp_hashinfo.bind_bucket_cachep) |
782 | goto out_proto_unregister; | |
783 | ||
784 | /* | |
785 | * Size and allocate the main established and bind bucket | |
786 | * hash tables. | |
787 | * | |
788 | * The methodology is similar to that of the buffer cache. | |
789 | */ | |
790 | if (num_physpages >= (128 * 1024)) | |
791 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
792 | else | |
793 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
794 | ||
795 | if (thash_entries) | |
7690af3f ACM |
796 | goal = (thash_entries * |
797 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
798 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
799 | ; | |
800 | do { | |
801 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
802 | sizeof(struct inet_ehash_bucket); | |
803 | dccp_hashinfo.ehash_size >>= 1; | |
7690af3f ACM |
804 | while (dccp_hashinfo.ehash_size & |
805 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
806 | dccp_hashinfo.ehash_size--; |
807 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
808 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
809 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
810 | ||
811 | if (!dccp_hashinfo.ehash) { | |
812 | printk(KERN_CRIT "Failed to allocate DCCP " | |
813 | "established hash table\n"); | |
814 | goto out_free_bind_bucket_cachep; | |
815 | } | |
816 | ||
817 | for (i = 0; i < (dccp_hashinfo.ehash_size << 1); i++) { | |
818 | rwlock_init(&dccp_hashinfo.ehash[i].lock); | |
819 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); | |
820 | } | |
821 | ||
822 | bhash_order = ehash_order; | |
823 | ||
824 | do { | |
825 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
826 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
827 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
828 | bhash_order > 0) | |
7c657876 ACM |
829 | continue; |
830 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
831 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
832 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
833 | ||
834 | if (!dccp_hashinfo.bhash) { | |
835 | printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n"); | |
836 | goto out_free_dccp_ehash; | |
837 | } | |
838 | ||
839 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
840 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
841 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
842 | } | |
843 | ||
844 | if (init_dccp_v4_mibs()) | |
845 | goto out_free_dccp_bhash; | |
846 | ||
847 | rc = -EAGAIN; | |
848 | if (inet_add_protocol(&dccp_protocol, IPPROTO_DCCP)) | |
849 | goto out_free_dccp_v4_mibs; | |
850 | ||
851 | inet_register_protosw(&dccp_v4_protosw); | |
852 | ||
853 | rc = dccp_ctl_sock_init(); | |
854 | if (rc) | |
855 | goto out_unregister_protosw; | |
856 | out: | |
857 | return rc; | |
858 | out_unregister_protosw: | |
859 | inet_unregister_protosw(&dccp_v4_protosw); | |
860 | inet_del_protocol(&dccp_protocol, IPPROTO_DCCP); | |
861 | out_free_dccp_v4_mibs: | |
862 | free_percpu(dccp_statistics[0]); | |
863 | free_percpu(dccp_statistics[1]); | |
864 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
865 | out_free_dccp_bhash: | |
866 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
867 | dccp_hashinfo.bhash = NULL; | |
868 | out_free_dccp_ehash: | |
869 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
870 | dccp_hashinfo.ehash = NULL; | |
871 | out_free_bind_bucket_cachep: | |
872 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
873 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
874 | out_proto_unregister: | |
34ca6860 | 875 | proto_unregister(&dccp_prot); |
7c657876 ACM |
876 | goto out; |
877 | } | |
878 | ||
879 | static const char dccp_del_proto_err_msg[] __exitdata = | |
880 | KERN_ERR "can't remove dccp net_protocol\n"; | |
881 | ||
882 | static void __exit dccp_fini(void) | |
883 | { | |
7c657876 ACM |
884 | inet_unregister_protosw(&dccp_v4_protosw); |
885 | ||
886 | if (inet_del_protocol(&dccp_protocol, IPPROTO_DCCP) < 0) | |
887 | printk(dccp_del_proto_err_msg); | |
888 | ||
725ba8ee ACM |
889 | free_percpu(dccp_statistics[0]); |
890 | free_percpu(dccp_statistics[1]); | |
891 | free_pages((unsigned long)dccp_hashinfo.bhash, | |
892 | get_order(dccp_hashinfo.bhash_size * | |
893 | sizeof(struct inet_bind_hashbucket))); | |
894 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
895 | get_order(dccp_hashinfo.ehash_size * | |
896 | sizeof(struct inet_ehash_bucket))); | |
7c657876 | 897 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
34ca6860 | 898 | proto_unregister(&dccp_prot); |
7c657876 ACM |
899 | } |
900 | ||
901 | module_init(dccp_init); | |
902 | module_exit(dccp_fini); | |
903 | ||
bb97d31f ACM |
904 | /* |
905 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
906 | * values directly, Also cover the case where the protocol is not specified, | |
907 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
908 | */ | |
909 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
910 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
7c657876 ACM |
911 | MODULE_LICENSE("GPL"); |
912 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
913 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |