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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, | |
49 | }; | |
50 | ||
51 | const char *dccp_packet_name(const int type) | |
52 | { | |
53 | static const char *dccp_packet_names[] = { | |
54 | [DCCP_PKT_REQUEST] = "REQUEST", | |
55 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
56 | [DCCP_PKT_DATA] = "DATA", | |
57 | [DCCP_PKT_ACK] = "ACK", | |
58 | [DCCP_PKT_DATAACK] = "DATAACK", | |
59 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
60 | [DCCP_PKT_CLOSE] = "CLOSE", | |
61 | [DCCP_PKT_RESET] = "RESET", | |
62 | [DCCP_PKT_SYNC] = "SYNC", | |
63 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
64 | }; | |
65 | ||
66 | if (type >= DCCP_NR_PKT_TYPES) | |
67 | return "INVALID"; | |
68 | else | |
69 | return dccp_packet_names[type]; | |
70 | } | |
71 | ||
72 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
73 | ||
74 | const char *dccp_state_name(const int state) | |
75 | { | |
76 | static char *dccp_state_names[] = { | |
77 | [DCCP_OPEN] = "OPEN", | |
78 | [DCCP_REQUESTING] = "REQUESTING", | |
79 | [DCCP_PARTOPEN] = "PARTOPEN", | |
80 | [DCCP_LISTEN] = "LISTEN", | |
81 | [DCCP_RESPOND] = "RESPOND", | |
82 | [DCCP_CLOSING] = "CLOSING", | |
83 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
84 | [DCCP_CLOSED] = "CLOSED", | |
85 | }; | |
86 | ||
87 | if (state >= DCCP_MAX_STATES) | |
88 | return "INVALID STATE!"; | |
89 | else | |
90 | return dccp_state_names[state]; | |
91 | } | |
92 | ||
93 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
94 | ||
95 | static inline int dccp_listen_start(struct sock *sk) | |
96 | { | |
67e6b629 ACM |
97 | struct dccp_sock *dp = dccp_sk(sk); |
98 | ||
99 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
100 | /* | |
101 | * Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE) | |
102 | * before calling listen() | |
103 | */ | |
104 | if (dccp_service_not_initialized(sk)) | |
105 | return -EPROTO; | |
7c657876 ACM |
106 | return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); |
107 | } | |
108 | ||
109 | int dccp_disconnect(struct sock *sk, int flags) | |
110 | { | |
111 | struct inet_connection_sock *icsk = inet_csk(sk); | |
112 | struct inet_sock *inet = inet_sk(sk); | |
113 | int err = 0; | |
114 | const int old_state = sk->sk_state; | |
115 | ||
116 | if (old_state != DCCP_CLOSED) | |
117 | dccp_set_state(sk, DCCP_CLOSED); | |
118 | ||
119 | /* ABORT function of RFC793 */ | |
120 | if (old_state == DCCP_LISTEN) { | |
121 | inet_csk_listen_stop(sk); | |
122 | /* FIXME: do the active reset thing */ | |
123 | } else if (old_state == DCCP_REQUESTING) | |
124 | sk->sk_err = ECONNRESET; | |
125 | ||
126 | dccp_clear_xmit_timers(sk); | |
127 | __skb_queue_purge(&sk->sk_receive_queue); | |
128 | if (sk->sk_send_head != NULL) { | |
129 | __kfree_skb(sk->sk_send_head); | |
130 | sk->sk_send_head = NULL; | |
131 | } | |
132 | ||
133 | inet->dport = 0; | |
134 | ||
135 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
136 | inet_reset_saddr(sk); | |
137 | ||
138 | sk->sk_shutdown = 0; | |
139 | sock_reset_flag(sk, SOCK_DONE); | |
140 | ||
141 | icsk->icsk_backoff = 0; | |
142 | inet_csk_delack_init(sk); | |
143 | __sk_dst_reset(sk); | |
144 | ||
145 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
146 | ||
147 | sk->sk_error_report(sk); | |
148 | return err; | |
149 | } | |
150 | ||
331968bd ACM |
151 | /* |
152 | * Wait for a DCCP event. | |
153 | * | |
154 | * Note that we don't need to lock the socket, as the upper poll layers | |
155 | * take care of normal races (between the test and the event) and we don't | |
156 | * go look at any of the socket buffers directly. | |
157 | */ | |
158 | static unsigned int dccp_poll(struct file *file, struct socket *sock, | |
159 | poll_table *wait) | |
160 | { | |
161 | unsigned int mask; | |
162 | struct sock *sk = sock->sk; | |
163 | ||
164 | poll_wait(file, sk->sk_sleep, wait); | |
165 | if (sk->sk_state == DCCP_LISTEN) | |
166 | return inet_csk_listen_poll(sk); | |
167 | ||
168 | /* Socket is not locked. We are protected from async events | |
169 | by poll logic and correct handling of state changes | |
170 | made by another threads is impossible in any case. | |
171 | */ | |
172 | ||
173 | mask = 0; | |
174 | if (sk->sk_err) | |
175 | mask = POLLERR; | |
176 | ||
177 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
178 | mask |= POLLHUP; | |
179 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
180 | mask |= POLLIN | POLLRDNORM; | |
181 | ||
182 | /* Connected? */ | |
183 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
184 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
185 | mask |= POLLIN | POLLRDNORM; | |
186 | ||
187 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
188 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
189 | mask |= POLLOUT | POLLWRNORM; | |
190 | } else { /* send SIGIO later */ | |
191 | set_bit(SOCK_ASYNC_NOSPACE, | |
192 | &sk->sk_socket->flags); | |
193 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
194 | ||
195 | /* Race breaker. If space is freed after | |
196 | * wspace test but before the flags are set, | |
197 | * IO signal will be lost. | |
198 | */ | |
199 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
200 | mask |= POLLOUT | POLLWRNORM; | |
201 | } | |
202 | } | |
203 | } | |
204 | return mask; | |
205 | } | |
206 | ||
7c657876 ACM |
207 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
208 | { | |
209 | dccp_pr_debug("entry\n"); | |
210 | return -ENOIOCTLCMD; | |
211 | } | |
212 | ||
67e6b629 ACM |
213 | static int dccp_setsockopt_service(struct sock *sk, const u32 service, |
214 | char __user *optval, int optlen) | |
215 | { | |
216 | struct dccp_sock *dp = dccp_sk(sk); | |
217 | struct dccp_service_list *sl = NULL; | |
218 | ||
219 | if (service == DCCP_SERVICE_INVALID_VALUE || | |
220 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) | |
221 | return -EINVAL; | |
222 | ||
223 | if (optlen > sizeof(service)) { | |
224 | sl = kmalloc(optlen, GFP_KERNEL); | |
225 | if (sl == NULL) | |
226 | return -ENOMEM; | |
227 | ||
228 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
229 | if (copy_from_user(sl->dccpsl_list, | |
230 | optval + sizeof(service), | |
231 | optlen - sizeof(service)) || | |
232 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
233 | kfree(sl); | |
234 | return -EFAULT; | |
235 | } | |
236 | } | |
237 | ||
238 | lock_sock(sk); | |
239 | dp->dccps_service = service; | |
240 | ||
241 | if (dp->dccps_service_list != NULL) | |
242 | kfree(dp->dccps_service_list); | |
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) | |
257 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
258 | ||
a84ffe43 ACM |
259 | if (optlen < sizeof(int)) |
260 | return -EINVAL; | |
261 | ||
262 | if (get_user(val, (int __user *)optval)) | |
263 | return -EFAULT; | |
264 | ||
67e6b629 ACM |
265 | if (optname == DCCP_SOCKOPT_SERVICE) |
266 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 267 | |
67e6b629 | 268 | lock_sock(sk); |
a84ffe43 ACM |
269 | dp = dccp_sk(sk); |
270 | err = 0; | |
271 | ||
272 | switch (optname) { | |
273 | case DCCP_SOCKOPT_PACKET_SIZE: | |
274 | dp->dccps_packet_size = val; | |
275 | break; | |
276 | default: | |
277 | err = -ENOPROTOOPT; | |
278 | break; | |
279 | } | |
280 | ||
281 | release_sock(sk); | |
282 | return err; | |
7c657876 ACM |
283 | } |
284 | ||
67e6b629 ACM |
285 | static int dccp_getsockopt_service(struct sock *sk, int len, |
286 | u32 __user *optval, | |
287 | int __user *optlen) | |
288 | { | |
289 | const struct dccp_sock *dp = dccp_sk(sk); | |
290 | const struct dccp_service_list *sl; | |
291 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
292 | ||
293 | lock_sock(sk); | |
294 | if (dccp_service_not_initialized(sk)) | |
295 | goto out; | |
296 | ||
297 | if ((sl = dp->dccps_service_list) != NULL) { | |
298 | slen = sl->dccpsl_nr * sizeof(u32); | |
299 | total_len += slen; | |
300 | } | |
301 | ||
302 | err = -EINVAL; | |
303 | if (total_len > len) | |
304 | goto out; | |
305 | ||
306 | err = 0; | |
307 | if (put_user(total_len, optlen) || | |
308 | put_user(dp->dccps_service, optval) || | |
309 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
310 | err = -EFAULT; | |
311 | out: | |
312 | release_sock(sk); | |
313 | return err; | |
314 | } | |
315 | ||
7c657876 | 316 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 317 | char __user *optval, int __user *optlen) |
7c657876 | 318 | { |
a84ffe43 ACM |
319 | struct dccp_sock *dp; |
320 | int val, len; | |
7c657876 ACM |
321 | |
322 | if (level != SOL_DCCP) | |
323 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
324 | ||
a84ffe43 ACM |
325 | if (get_user(len, optlen)) |
326 | return -EFAULT; | |
327 | ||
88f964db | 328 | if (len < sizeof(int)) |
a84ffe43 ACM |
329 | return -EINVAL; |
330 | ||
331 | dp = dccp_sk(sk); | |
332 | ||
333 | switch (optname) { | |
334 | case DCCP_SOCKOPT_PACKET_SIZE: | |
335 | val = dp->dccps_packet_size; | |
88f964db | 336 | len = sizeof(dp->dccps_packet_size); |
a84ffe43 | 337 | break; |
88f964db ACM |
338 | case DCCP_SOCKOPT_SERVICE: |
339 | return dccp_getsockopt_service(sk, len, | |
340 | (u32 __user *)optval, optlen); | |
341 | case 128 ... 191: | |
342 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
343 | len, (u32 __user *)optval, optlen); | |
344 | case 192 ... 255: | |
345 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
346 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
347 | default: |
348 | return -ENOPROTOOPT; | |
349 | } | |
350 | ||
351 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
352 | return -EFAULT; | |
353 | ||
354 | return 0; | |
7c657876 ACM |
355 | } |
356 | ||
357 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
358 | size_t len) | |
359 | { | |
360 | const struct dccp_sock *dp = dccp_sk(sk); | |
361 | const int flags = msg->msg_flags; | |
362 | const int noblock = flags & MSG_DONTWAIT; | |
363 | struct sk_buff *skb; | |
364 | int rc, size; | |
365 | long timeo; | |
366 | ||
367 | if (len > dp->dccps_mss_cache) | |
368 | return -EMSGSIZE; | |
369 | ||
370 | lock_sock(sk); | |
27258ee5 | 371 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
372 | |
373 | /* | |
374 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
375 | * so that the trick in dccp_rcv_request_sent_state_process. | |
376 | */ | |
377 | /* Wait for a connection to finish. */ | |
378 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING)) | |
379 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) | |
27258ee5 | 380 | goto out_release; |
7c657876 ACM |
381 | |
382 | size = sk->sk_prot->max_header + len; | |
383 | release_sock(sk); | |
384 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
385 | lock_sock(sk); | |
7c657876 ACM |
386 | if (skb == NULL) |
387 | goto out_release; | |
388 | ||
389 | skb_reserve(skb, sk->sk_prot->max_header); | |
390 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
391 | if (rc != 0) |
392 | goto out_discard; | |
393 | ||
d6809c12 | 394 | rc = dccp_write_xmit(sk, skb, &timeo); |
20472af9 ACM |
395 | /* |
396 | * XXX we don't use sk_write_queue, so just discard the packet. | |
397 | * Current plan however is to _use_ sk_write_queue with | |
398 | * an algorith similar to tcp_sendmsg, where the main difference | |
399 | * is that in DCCP we have to respect packet boundaries, so | |
400 | * no coalescing of skbs. | |
401 | * | |
402 | * This bug was _quickly_ found & fixed by just looking at an OSTRA | |
403 | * generated callgraph 8) -acme | |
404 | */ | |
7c657876 ACM |
405 | out_release: |
406 | release_sock(sk); | |
407 | return rc ? : len; | |
27258ee5 ACM |
408 | out_discard: |
409 | kfree_skb(skb); | |
7c657876 | 410 | goto out_release; |
7c657876 ACM |
411 | } |
412 | ||
7c657876 ACM |
413 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
414 | size_t len, int nonblock, int flags, int *addr_len) | |
415 | { | |
416 | const struct dccp_hdr *dh; | |
7c657876 ACM |
417 | long timeo; |
418 | ||
419 | lock_sock(sk); | |
420 | ||
531669a0 ACM |
421 | if (sk->sk_state == DCCP_LISTEN) { |
422 | len = -ENOTCONN; | |
7c657876 | 423 | goto out; |
7c657876 | 424 | } |
7c657876 | 425 | |
531669a0 | 426 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
427 | |
428 | do { | |
531669a0 | 429 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 430 | |
531669a0 ACM |
431 | if (skb == NULL) |
432 | goto verify_sock_status; | |
7c657876 | 433 | |
531669a0 | 434 | dh = dccp_hdr(skb); |
7c657876 | 435 | |
531669a0 ACM |
436 | if (dh->dccph_type == DCCP_PKT_DATA || |
437 | dh->dccph_type == DCCP_PKT_DATAACK) | |
438 | goto found_ok_skb; | |
7c657876 | 439 | |
531669a0 ACM |
440 | if (dh->dccph_type == DCCP_PKT_RESET || |
441 | dh->dccph_type == DCCP_PKT_CLOSE) { | |
442 | dccp_pr_debug("found fin ok!\n"); | |
443 | len = 0; | |
444 | goto found_fin_ok; | |
445 | } | |
446 | dccp_pr_debug("packet_type=%s\n", | |
447 | dccp_packet_name(dh->dccph_type)); | |
448 | sk_eat_skb(sk, skb); | |
449 | verify_sock_status: | |
450 | if (sock_flag(sk, SOCK_DONE)) { | |
451 | len = 0; | |
7c657876 | 452 | break; |
531669a0 | 453 | } |
7c657876 | 454 | |
531669a0 ACM |
455 | if (sk->sk_err) { |
456 | len = sock_error(sk); | |
457 | break; | |
458 | } | |
7c657876 | 459 | |
531669a0 ACM |
460 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
461 | len = 0; | |
462 | break; | |
463 | } | |
7c657876 | 464 | |
531669a0 ACM |
465 | if (sk->sk_state == DCCP_CLOSED) { |
466 | if (!sock_flag(sk, SOCK_DONE)) { | |
467 | /* This occurs when user tries to read | |
468 | * from never connected socket. | |
469 | */ | |
470 | len = -ENOTCONN; | |
7c657876 ACM |
471 | break; |
472 | } | |
531669a0 ACM |
473 | len = 0; |
474 | break; | |
7c657876 ACM |
475 | } |
476 | ||
531669a0 ACM |
477 | if (!timeo) { |
478 | len = -EAGAIN; | |
479 | break; | |
480 | } | |
7c657876 | 481 | |
531669a0 ACM |
482 | if (signal_pending(current)) { |
483 | len = sock_intr_errno(timeo); | |
484 | break; | |
485 | } | |
7c657876 | 486 | |
531669a0 | 487 | sk_wait_data(sk, &timeo); |
7c657876 | 488 | continue; |
7c657876 | 489 | found_ok_skb: |
531669a0 ACM |
490 | if (len > skb->len) |
491 | len = skb->len; | |
492 | else if (len < skb->len) | |
493 | msg->msg_flags |= MSG_TRUNC; | |
494 | ||
495 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
496 | /* Exception. Bailout! */ | |
497 | len = -EFAULT; | |
498 | break; | |
7c657876 | 499 | } |
7c657876 ACM |
500 | found_fin_ok: |
501 | if (!(flags & MSG_PEEK)) | |
502 | sk_eat_skb(sk, skb); | |
503 | break; | |
531669a0 | 504 | } while (1); |
7c657876 ACM |
505 | out: |
506 | release_sock(sk); | |
531669a0 | 507 | return len; |
7c657876 ACM |
508 | } |
509 | ||
510 | static int inet_dccp_listen(struct socket *sock, int backlog) | |
511 | { | |
512 | struct sock *sk = sock->sk; | |
513 | unsigned char old_state; | |
514 | int err; | |
515 | ||
516 | lock_sock(sk); | |
517 | ||
518 | err = -EINVAL; | |
519 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
520 | goto out; | |
521 | ||
522 | old_state = sk->sk_state; | |
523 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
524 | goto out; | |
525 | ||
526 | /* Really, if the socket is already in listen state | |
527 | * we can only allow the backlog to be adjusted. | |
528 | */ | |
529 | if (old_state != DCCP_LISTEN) { | |
530 | /* | |
531 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
532 | * see tcp_listen_start | |
533 | */ | |
534 | err = dccp_listen_start(sk); | |
535 | if (err) | |
536 | goto out; | |
537 | } | |
538 | sk->sk_max_ack_backlog = backlog; | |
539 | err = 0; | |
540 | ||
541 | out: | |
542 | release_sock(sk); | |
543 | return err; | |
544 | } | |
545 | ||
546 | static const unsigned char dccp_new_state[] = { | |
7690af3f ACM |
547 | /* current state: new state: action: */ |
548 | [0] = DCCP_CLOSED, | |
549 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
550 | [DCCP_REQUESTING] = DCCP_CLOSED, | |
551 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
552 | [DCCP_LISTEN] = DCCP_CLOSED, | |
553 | [DCCP_RESPOND] = DCCP_CLOSED, | |
554 | [DCCP_CLOSING] = DCCP_CLOSED, | |
555 | [DCCP_TIME_WAIT] = DCCP_CLOSED, | |
556 | [DCCP_CLOSED] = DCCP_CLOSED, | |
7c657876 ACM |
557 | }; |
558 | ||
559 | static int dccp_close_state(struct sock *sk) | |
560 | { | |
561 | const int next = dccp_new_state[sk->sk_state]; | |
562 | const int ns = next & DCCP_STATE_MASK; | |
563 | ||
564 | if (ns != sk->sk_state) | |
565 | dccp_set_state(sk, ns); | |
566 | ||
567 | return next & DCCP_ACTION_FIN; | |
568 | } | |
569 | ||
570 | void dccp_close(struct sock *sk, long timeout) | |
571 | { | |
572 | struct sk_buff *skb; | |
573 | ||
574 | lock_sock(sk); | |
575 | ||
576 | sk->sk_shutdown = SHUTDOWN_MASK; | |
577 | ||
578 | if (sk->sk_state == DCCP_LISTEN) { | |
579 | dccp_set_state(sk, DCCP_CLOSED); | |
580 | ||
581 | /* Special case. */ | |
582 | inet_csk_listen_stop(sk); | |
583 | ||
584 | goto adjudge_to_death; | |
585 | } | |
586 | ||
587 | /* | |
588 | * We need to flush the recv. buffs. We do this only on the | |
589 | * descriptor close, not protocol-sourced closes, because the | |
590 | *reader process may not have drained the data yet! | |
591 | */ | |
592 | /* FIXME: check for unread data */ | |
593 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
594 | __kfree_skb(skb); | |
595 | } | |
596 | ||
597 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
598 | /* Check zero linger _after_ checking for unread data. */ | |
599 | sk->sk_prot->disconnect(sk, 0); | |
600 | } else if (dccp_close_state(sk)) { | |
7ad07e7c | 601 | dccp_send_close(sk, 1); |
7c657876 ACM |
602 | } |
603 | ||
604 | sk_stream_wait_close(sk, timeout); | |
605 | ||
606 | adjudge_to_death: | |
7ad07e7c ACM |
607 | /* |
608 | * It is the last release_sock in its life. It will remove backlog. | |
609 | */ | |
7c657876 ACM |
610 | release_sock(sk); |
611 | /* | |
612 | * Now socket is owned by kernel and we acquire BH lock | |
613 | * to finish close. No need to check for user refs. | |
614 | */ | |
615 | local_bh_disable(); | |
616 | bh_lock_sock(sk); | |
617 | BUG_TRAP(!sock_owned_by_user(sk)); | |
618 | ||
619 | sock_hold(sk); | |
620 | sock_orphan(sk); | |
7ad07e7c ACM |
621 | |
622 | /* | |
623 | * The last release_sock may have processed the CLOSE or RESET | |
624 | * packet moving sock to CLOSED state, if not we have to fire | |
625 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" | |
626 | * in draft-ietf-dccp-spec-11. -acme | |
627 | */ | |
628 | if (sk->sk_state == DCCP_CLOSING) { | |
629 | /* FIXME: should start at 2 * RTT */ | |
630 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ | |
631 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
632 | inet_csk(sk)->icsk_rto, | |
633 | DCCP_RTO_MAX); | |
634 | #if 0 | |
635 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ | |
7c657876 | 636 | dccp_set_state(sk, DCCP_CLOSED); |
7ad07e7c ACM |
637 | #endif |
638 | } | |
7c657876 | 639 | |
7ad07e7c | 640 | atomic_inc(sk->sk_prot->orphan_count); |
7c657876 ACM |
641 | if (sk->sk_state == DCCP_CLOSED) |
642 | inet_csk_destroy_sock(sk); | |
643 | ||
644 | /* Otherwise, socket is reprieved until protocol close. */ | |
645 | ||
646 | bh_unlock_sock(sk); | |
647 | local_bh_enable(); | |
648 | sock_put(sk); | |
649 | } | |
650 | ||
651 | void dccp_shutdown(struct sock *sk, int how) | |
652 | { | |
653 | dccp_pr_debug("entry\n"); | |
654 | } | |
655 | ||
a1d3a355 | 656 | static struct proto_ops inet_dccp_ops = { |
7c657876 ACM |
657 | .family = PF_INET, |
658 | .owner = THIS_MODULE, | |
659 | .release = inet_release, | |
660 | .bind = inet_bind, | |
661 | .connect = inet_stream_connect, | |
662 | .socketpair = sock_no_socketpair, | |
663 | .accept = inet_accept, | |
664 | .getname = inet_getname, | |
331968bd ACM |
665 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
666 | .poll = dccp_poll, | |
7c657876 | 667 | .ioctl = inet_ioctl, |
7690af3f ACM |
668 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
669 | .listen = inet_dccp_listen, | |
7c657876 ACM |
670 | .shutdown = inet_shutdown, |
671 | .setsockopt = sock_common_setsockopt, | |
672 | .getsockopt = sock_common_getsockopt, | |
673 | .sendmsg = inet_sendmsg, | |
674 | .recvmsg = sock_common_recvmsg, | |
675 | .mmap = sock_no_mmap, | |
676 | .sendpage = sock_no_sendpage, | |
677 | }; | |
678 | ||
679 | extern struct net_proto_family inet_family_ops; | |
680 | ||
681 | static struct inet_protosw dccp_v4_protosw = { | |
682 | .type = SOCK_DCCP, | |
683 | .protocol = IPPROTO_DCCP, | |
684 | .prot = &dccp_v4_prot, | |
685 | .ops = &inet_dccp_ops, | |
686 | .capability = -1, | |
687 | .no_check = 0, | |
688 | .flags = 0, | |
689 | }; | |
690 | ||
691 | /* | |
692 | * This is the global socket data structure used for responding to | |
693 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
694 | * for this socket at the initialization time. | |
695 | */ | |
696 | struct socket *dccp_ctl_socket; | |
697 | ||
698 | static char dccp_ctl_socket_err_msg[] __initdata = | |
699 | KERN_ERR "DCCP: Failed to create the control socket.\n"; | |
700 | ||
701 | static int __init dccp_ctl_sock_init(void) | |
702 | { | |
703 | int rc = sock_create_kern(PF_INET, SOCK_DCCP, IPPROTO_DCCP, | |
704 | &dccp_ctl_socket); | |
705 | if (rc < 0) | |
706 | printk(dccp_ctl_socket_err_msg); | |
707 | else { | |
708 | dccp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; | |
709 | inet_sk(dccp_ctl_socket->sk)->uc_ttl = -1; | |
710 | ||
711 | /* Unhash it so that IP input processing does not even | |
712 | * see it, we do not wish this socket to see incoming | |
713 | * packets. | |
714 | */ | |
715 | dccp_ctl_socket->sk->sk_prot->unhash(dccp_ctl_socket->sk); | |
716 | } | |
717 | ||
718 | return rc; | |
719 | } | |
720 | ||
725ba8ee ACM |
721 | #ifdef CONFIG_IP_DCCP_UNLOAD_HACK |
722 | void dccp_ctl_sock_exit(void) | |
7c657876 | 723 | { |
5480855b | 724 | if (dccp_ctl_socket != NULL) { |
7c657876 | 725 | sock_release(dccp_ctl_socket); |
5480855b ACM |
726 | dccp_ctl_socket = NULL; |
727 | } | |
7c657876 ACM |
728 | } |
729 | ||
725ba8ee ACM |
730 | EXPORT_SYMBOL_GPL(dccp_ctl_sock_exit); |
731 | #endif | |
732 | ||
7c657876 ACM |
733 | static int __init init_dccp_v4_mibs(void) |
734 | { | |
735 | int rc = -ENOMEM; | |
736 | ||
737 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
738 | if (dccp_statistics[0] == NULL) | |
739 | goto out; | |
740 | ||
741 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
742 | if (dccp_statistics[1] == NULL) | |
743 | goto out_free_one; | |
744 | ||
745 | rc = 0; | |
746 | out: | |
747 | return rc; | |
748 | out_free_one: | |
749 | free_percpu(dccp_statistics[0]); | |
750 | dccp_statistics[0] = NULL; | |
751 | goto out; | |
752 | ||
753 | } | |
754 | ||
755 | static int thash_entries; | |
756 | module_param(thash_entries, int, 0444); | |
757 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
758 | ||
a1d3a355 | 759 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 ACM |
760 | int dccp_debug; |
761 | module_param(dccp_debug, int, 0444); | |
762 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); | |
a1d3a355 | 763 | #endif |
7c657876 ACM |
764 | |
765 | static int __init dccp_init(void) | |
766 | { | |
767 | unsigned long goal; | |
768 | int ehash_order, bhash_order, i; | |
769 | int rc = proto_register(&dccp_v4_prot, 1); | |
770 | ||
771 | if (rc) | |
772 | goto out; | |
773 | ||
7690af3f ACM |
774 | dccp_hashinfo.bind_bucket_cachep = |
775 | kmem_cache_create("dccp_bind_bucket", | |
776 | sizeof(struct inet_bind_bucket), 0, | |
777 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
7c657876 ACM |
778 | if (!dccp_hashinfo.bind_bucket_cachep) |
779 | goto out_proto_unregister; | |
780 | ||
781 | /* | |
782 | * Size and allocate the main established and bind bucket | |
783 | * hash tables. | |
784 | * | |
785 | * The methodology is similar to that of the buffer cache. | |
786 | */ | |
787 | if (num_physpages >= (128 * 1024)) | |
788 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
789 | else | |
790 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
791 | ||
792 | if (thash_entries) | |
7690af3f ACM |
793 | goal = (thash_entries * |
794 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
795 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
796 | ; | |
797 | do { | |
798 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
799 | sizeof(struct inet_ehash_bucket); | |
800 | dccp_hashinfo.ehash_size >>= 1; | |
7690af3f ACM |
801 | while (dccp_hashinfo.ehash_size & |
802 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
803 | dccp_hashinfo.ehash_size--; |
804 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
805 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
806 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
807 | ||
808 | if (!dccp_hashinfo.ehash) { | |
809 | printk(KERN_CRIT "Failed to allocate DCCP " | |
810 | "established hash table\n"); | |
811 | goto out_free_bind_bucket_cachep; | |
812 | } | |
813 | ||
814 | for (i = 0; i < (dccp_hashinfo.ehash_size << 1); i++) { | |
815 | rwlock_init(&dccp_hashinfo.ehash[i].lock); | |
816 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); | |
817 | } | |
818 | ||
819 | bhash_order = ehash_order; | |
820 | ||
821 | do { | |
822 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
823 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
824 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
825 | bhash_order > 0) | |
7c657876 ACM |
826 | continue; |
827 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
828 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
829 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
830 | ||
831 | if (!dccp_hashinfo.bhash) { | |
832 | printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n"); | |
833 | goto out_free_dccp_ehash; | |
834 | } | |
835 | ||
836 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
837 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
838 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
839 | } | |
840 | ||
841 | if (init_dccp_v4_mibs()) | |
842 | goto out_free_dccp_bhash; | |
843 | ||
844 | rc = -EAGAIN; | |
845 | if (inet_add_protocol(&dccp_protocol, IPPROTO_DCCP)) | |
846 | goto out_free_dccp_v4_mibs; | |
847 | ||
848 | inet_register_protosw(&dccp_v4_protosw); | |
849 | ||
850 | rc = dccp_ctl_sock_init(); | |
851 | if (rc) | |
852 | goto out_unregister_protosw; | |
853 | out: | |
854 | return rc; | |
855 | out_unregister_protosw: | |
856 | inet_unregister_protosw(&dccp_v4_protosw); | |
857 | inet_del_protocol(&dccp_protocol, IPPROTO_DCCP); | |
858 | out_free_dccp_v4_mibs: | |
859 | free_percpu(dccp_statistics[0]); | |
860 | free_percpu(dccp_statistics[1]); | |
861 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
862 | out_free_dccp_bhash: | |
863 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
864 | dccp_hashinfo.bhash = NULL; | |
865 | out_free_dccp_ehash: | |
866 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
867 | dccp_hashinfo.ehash = NULL; | |
868 | out_free_bind_bucket_cachep: | |
869 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
870 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
871 | out_proto_unregister: | |
872 | proto_unregister(&dccp_v4_prot); | |
873 | goto out; | |
874 | } | |
875 | ||
876 | static const char dccp_del_proto_err_msg[] __exitdata = | |
877 | KERN_ERR "can't remove dccp net_protocol\n"; | |
878 | ||
879 | static void __exit dccp_fini(void) | |
880 | { | |
7c657876 ACM |
881 | inet_unregister_protosw(&dccp_v4_protosw); |
882 | ||
883 | if (inet_del_protocol(&dccp_protocol, IPPROTO_DCCP) < 0) | |
884 | printk(dccp_del_proto_err_msg); | |
885 | ||
725ba8ee ACM |
886 | free_percpu(dccp_statistics[0]); |
887 | free_percpu(dccp_statistics[1]); | |
888 | free_pages((unsigned long)dccp_hashinfo.bhash, | |
889 | get_order(dccp_hashinfo.bhash_size * | |
890 | sizeof(struct inet_bind_hashbucket))); | |
891 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
892 | get_order(dccp_hashinfo.ehash_size * | |
893 | sizeof(struct inet_ehash_bucket))); | |
7c657876 | 894 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
725ba8ee | 895 | proto_unregister(&dccp_v4_prot); |
7c657876 ACM |
896 | } |
897 | ||
898 | module_init(dccp_init); | |
899 | module_exit(dccp_fini); | |
900 | ||
bb97d31f ACM |
901 | /* |
902 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
903 | * values directly, Also cover the case where the protocol is not specified, | |
904 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
905 | */ | |
906 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
907 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
7c657876 ACM |
908 | MODULE_LICENSE("GPL"); |
909 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
910 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |