Commit | Line | Data |
---|---|---|
7c657876 ACM |
1 | /* |
2 | * net/dccp/proto.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
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> | |
14c85021 | 27 | #include <net/inet_sock.h> |
7c657876 ACM |
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> | |
7c657876 ACM |
37 | |
38 | #include "ccid.h" | |
39 | #include "dccp.h" | |
afe00251 | 40 | #include "feat.h" |
7c657876 | 41 | |
ba89966c | 42 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
7c657876 | 43 | |
f21e68ca ACM |
44 | EXPORT_SYMBOL_GPL(dccp_statistics); |
45 | ||
7c657876 ACM |
46 | atomic_t dccp_orphan_count = ATOMIC_INIT(0); |
47 | ||
f21e68ca ACM |
48 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
49 | ||
7c657876 ACM |
50 | static struct net_protocol dccp_protocol = { |
51 | .handler = dccp_v4_rcv, | |
52 | .err_handler = dccp_v4_err, | |
a516b049 | 53 | .no_policy = 1, |
7c657876 ACM |
54 | }; |
55 | ||
56 | const char *dccp_packet_name(const int type) | |
57 | { | |
58 | static const char *dccp_packet_names[] = { | |
59 | [DCCP_PKT_REQUEST] = "REQUEST", | |
60 | [DCCP_PKT_RESPONSE] = "RESPONSE", | |
61 | [DCCP_PKT_DATA] = "DATA", | |
62 | [DCCP_PKT_ACK] = "ACK", | |
63 | [DCCP_PKT_DATAACK] = "DATAACK", | |
64 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", | |
65 | [DCCP_PKT_CLOSE] = "CLOSE", | |
66 | [DCCP_PKT_RESET] = "RESET", | |
67 | [DCCP_PKT_SYNC] = "SYNC", | |
68 | [DCCP_PKT_SYNCACK] = "SYNCACK", | |
69 | }; | |
70 | ||
71 | if (type >= DCCP_NR_PKT_TYPES) | |
72 | return "INVALID"; | |
73 | else | |
74 | return dccp_packet_names[type]; | |
75 | } | |
76 | ||
77 | EXPORT_SYMBOL_GPL(dccp_packet_name); | |
78 | ||
79 | const char *dccp_state_name(const int state) | |
80 | { | |
81 | static char *dccp_state_names[] = { | |
82 | [DCCP_OPEN] = "OPEN", | |
83 | [DCCP_REQUESTING] = "REQUESTING", | |
84 | [DCCP_PARTOPEN] = "PARTOPEN", | |
85 | [DCCP_LISTEN] = "LISTEN", | |
86 | [DCCP_RESPOND] = "RESPOND", | |
87 | [DCCP_CLOSING] = "CLOSING", | |
88 | [DCCP_TIME_WAIT] = "TIME_WAIT", | |
89 | [DCCP_CLOSED] = "CLOSED", | |
90 | }; | |
91 | ||
92 | if (state >= DCCP_MAX_STATES) | |
93 | return "INVALID STATE!"; | |
94 | else | |
95 | return dccp_state_names[state]; | |
96 | } | |
97 | ||
98 | EXPORT_SYMBOL_GPL(dccp_state_name); | |
99 | ||
100 | static inline int dccp_listen_start(struct sock *sk) | |
101 | { | |
67e6b629 ACM |
102 | struct dccp_sock *dp = dccp_sk(sk); |
103 | ||
104 | dp->dccps_role = DCCP_ROLE_LISTEN; | |
105 | /* | |
106 | * Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE) | |
107 | * before calling listen() | |
108 | */ | |
109 | if (dccp_service_not_initialized(sk)) | |
110 | return -EPROTO; | |
7c657876 ACM |
111 | return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); |
112 | } | |
113 | ||
114 | int dccp_disconnect(struct sock *sk, int flags) | |
115 | { | |
116 | struct inet_connection_sock *icsk = inet_csk(sk); | |
117 | struct inet_sock *inet = inet_sk(sk); | |
118 | int err = 0; | |
119 | const int old_state = sk->sk_state; | |
120 | ||
121 | if (old_state != DCCP_CLOSED) | |
122 | dccp_set_state(sk, DCCP_CLOSED); | |
123 | ||
124 | /* ABORT function of RFC793 */ | |
125 | if (old_state == DCCP_LISTEN) { | |
126 | inet_csk_listen_stop(sk); | |
127 | /* FIXME: do the active reset thing */ | |
128 | } else if (old_state == DCCP_REQUESTING) | |
129 | sk->sk_err = ECONNRESET; | |
130 | ||
131 | dccp_clear_xmit_timers(sk); | |
132 | __skb_queue_purge(&sk->sk_receive_queue); | |
133 | if (sk->sk_send_head != NULL) { | |
134 | __kfree_skb(sk->sk_send_head); | |
135 | sk->sk_send_head = NULL; | |
136 | } | |
137 | ||
138 | inet->dport = 0; | |
139 | ||
140 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
141 | inet_reset_saddr(sk); | |
142 | ||
143 | sk->sk_shutdown = 0; | |
144 | sock_reset_flag(sk, SOCK_DONE); | |
145 | ||
146 | icsk->icsk_backoff = 0; | |
147 | inet_csk_delack_init(sk); | |
148 | __sk_dst_reset(sk); | |
149 | ||
150 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); | |
151 | ||
152 | sk->sk_error_report(sk); | |
153 | return err; | |
154 | } | |
155 | ||
f21e68ca ACM |
156 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
157 | ||
331968bd ACM |
158 | /* |
159 | * Wait for a DCCP event. | |
160 | * | |
161 | * Note that we don't need to lock the socket, as the upper poll layers | |
162 | * take care of normal races (between the test and the event) and we don't | |
163 | * go look at any of the socket buffers directly. | |
164 | */ | |
f21e68ca ACM |
165 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
166 | poll_table *wait) | |
331968bd ACM |
167 | { |
168 | unsigned int mask; | |
169 | struct sock *sk = sock->sk; | |
170 | ||
171 | poll_wait(file, sk->sk_sleep, wait); | |
172 | if (sk->sk_state == DCCP_LISTEN) | |
173 | return inet_csk_listen_poll(sk); | |
174 | ||
175 | /* Socket is not locked. We are protected from async events | |
176 | by poll logic and correct handling of state changes | |
177 | made by another threads is impossible in any case. | |
178 | */ | |
179 | ||
180 | mask = 0; | |
181 | if (sk->sk_err) | |
182 | mask = POLLERR; | |
183 | ||
184 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) | |
185 | mask |= POLLHUP; | |
186 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
187 | mask |= POLLIN | POLLRDNORM; | |
188 | ||
189 | /* Connected? */ | |
190 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { | |
191 | if (atomic_read(&sk->sk_rmem_alloc) > 0) | |
192 | mask |= POLLIN | POLLRDNORM; | |
193 | ||
194 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
195 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
196 | mask |= POLLOUT | POLLWRNORM; | |
197 | } else { /* send SIGIO later */ | |
198 | set_bit(SOCK_ASYNC_NOSPACE, | |
199 | &sk->sk_socket->flags); | |
200 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
201 | ||
202 | /* Race breaker. If space is freed after | |
203 | * wspace test but before the flags are set, | |
204 | * IO signal will be lost. | |
205 | */ | |
206 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) | |
207 | mask |= POLLOUT | POLLWRNORM; | |
208 | } | |
209 | } | |
210 | } | |
211 | return mask; | |
212 | } | |
213 | ||
f21e68ca ACM |
214 | EXPORT_SYMBOL_GPL(dccp_poll); |
215 | ||
7c657876 ACM |
216 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
217 | { | |
218 | dccp_pr_debug("entry\n"); | |
219 | return -ENOIOCTLCMD; | |
220 | } | |
221 | ||
f21e68ca ACM |
222 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
223 | ||
67e6b629 ACM |
224 | static int dccp_setsockopt_service(struct sock *sk, const u32 service, |
225 | char __user *optval, int optlen) | |
226 | { | |
227 | struct dccp_sock *dp = dccp_sk(sk); | |
228 | struct dccp_service_list *sl = NULL; | |
229 | ||
230 | if (service == DCCP_SERVICE_INVALID_VALUE || | |
231 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) | |
232 | return -EINVAL; | |
233 | ||
234 | if (optlen > sizeof(service)) { | |
235 | sl = kmalloc(optlen, GFP_KERNEL); | |
236 | if (sl == NULL) | |
237 | return -ENOMEM; | |
238 | ||
239 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; | |
240 | if (copy_from_user(sl->dccpsl_list, | |
241 | optval + sizeof(service), | |
242 | optlen - sizeof(service)) || | |
243 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { | |
244 | kfree(sl); | |
245 | return -EFAULT; | |
246 | } | |
247 | } | |
248 | ||
249 | lock_sock(sk); | |
250 | dp->dccps_service = service; | |
251 | ||
a51482bd | 252 | kfree(dp->dccps_service_list); |
67e6b629 ACM |
253 | |
254 | dp->dccps_service_list = sl; | |
255 | release_sock(sk); | |
256 | return 0; | |
257 | } | |
258 | ||
afe00251 AB |
259 | /* byte 1 is feature. the rest is the preference list */ |
260 | static int dccp_setsockopt_change(struct sock *sk, int type, | |
261 | struct dccp_so_feat __user *optval) | |
262 | { | |
263 | struct dccp_so_feat opt; | |
264 | u8 *val; | |
265 | int rc; | |
266 | ||
267 | if (copy_from_user(&opt, optval, sizeof(opt))) | |
268 | return -EFAULT; | |
269 | ||
270 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); | |
271 | if (!val) | |
272 | return -ENOMEM; | |
273 | ||
274 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { | |
275 | rc = -EFAULT; | |
276 | goto out_free_val; | |
277 | } | |
278 | ||
279 | rc = dccp_feat_change(sk, type, opt.dccpsf_feat, val, opt.dccpsf_len, | |
280 | GFP_KERNEL); | |
281 | if (rc) | |
282 | goto out_free_val; | |
283 | ||
284 | out: | |
285 | return rc; | |
286 | ||
287 | out_free_val: | |
288 | kfree(val); | |
289 | goto out; | |
290 | } | |
291 | ||
7c657876 | 292 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 293 | char __user *optval, int optlen) |
7c657876 | 294 | { |
a84ffe43 ACM |
295 | struct dccp_sock *dp; |
296 | int err; | |
297 | int val; | |
7c657876 ACM |
298 | |
299 | if (level != SOL_DCCP) | |
57cca05a ACM |
300 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, |
301 | optname, optval, | |
302 | optlen); | |
7c657876 | 303 | |
a84ffe43 ACM |
304 | if (optlen < sizeof(int)) |
305 | return -EINVAL; | |
306 | ||
307 | if (get_user(val, (int __user *)optval)) | |
308 | return -EFAULT; | |
309 | ||
67e6b629 ACM |
310 | if (optname == DCCP_SOCKOPT_SERVICE) |
311 | return dccp_setsockopt_service(sk, val, optval, optlen); | |
a84ffe43 | 312 | |
67e6b629 | 313 | lock_sock(sk); |
a84ffe43 ACM |
314 | dp = dccp_sk(sk); |
315 | err = 0; | |
316 | ||
317 | switch (optname) { | |
318 | case DCCP_SOCKOPT_PACKET_SIZE: | |
319 | dp->dccps_packet_size = val; | |
320 | break; | |
afe00251 AB |
321 | |
322 | case DCCP_SOCKOPT_CHANGE_L: | |
323 | if (optlen != sizeof(struct dccp_so_feat)) | |
324 | err = -EINVAL; | |
325 | else | |
326 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, | |
327 | (struct dccp_so_feat *) | |
328 | optval); | |
329 | break; | |
330 | ||
331 | case DCCP_SOCKOPT_CHANGE_R: | |
332 | if (optlen != sizeof(struct dccp_so_feat)) | |
333 | err = -EINVAL; | |
334 | else | |
335 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, | |
336 | (struct dccp_so_feat *) | |
337 | optval); | |
338 | break; | |
339 | ||
a84ffe43 ACM |
340 | default: |
341 | err = -ENOPROTOOPT; | |
342 | break; | |
343 | } | |
344 | ||
345 | release_sock(sk); | |
346 | return err; | |
7c657876 ACM |
347 | } |
348 | ||
f21e68ca ACM |
349 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
350 | ||
67e6b629 ACM |
351 | static int dccp_getsockopt_service(struct sock *sk, int len, |
352 | u32 __user *optval, | |
353 | int __user *optlen) | |
354 | { | |
355 | const struct dccp_sock *dp = dccp_sk(sk); | |
356 | const struct dccp_service_list *sl; | |
357 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); | |
358 | ||
359 | lock_sock(sk); | |
360 | if (dccp_service_not_initialized(sk)) | |
361 | goto out; | |
362 | ||
363 | if ((sl = dp->dccps_service_list) != NULL) { | |
364 | slen = sl->dccpsl_nr * sizeof(u32); | |
365 | total_len += slen; | |
366 | } | |
367 | ||
368 | err = -EINVAL; | |
369 | if (total_len > len) | |
370 | goto out; | |
371 | ||
372 | err = 0; | |
373 | if (put_user(total_len, optlen) || | |
374 | put_user(dp->dccps_service, optval) || | |
375 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) | |
376 | err = -EFAULT; | |
377 | out: | |
378 | release_sock(sk); | |
379 | return err; | |
380 | } | |
381 | ||
7c657876 | 382 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 | 383 | char __user *optval, int __user *optlen) |
7c657876 | 384 | { |
a84ffe43 ACM |
385 | struct dccp_sock *dp; |
386 | int val, len; | |
7c657876 ACM |
387 | |
388 | if (level != SOL_DCCP) | |
57cca05a ACM |
389 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, |
390 | optname, optval, | |
391 | optlen); | |
a84ffe43 ACM |
392 | if (get_user(len, optlen)) |
393 | return -EFAULT; | |
394 | ||
88f964db | 395 | if (len < sizeof(int)) |
a84ffe43 ACM |
396 | return -EINVAL; |
397 | ||
398 | dp = dccp_sk(sk); | |
399 | ||
400 | switch (optname) { | |
401 | case DCCP_SOCKOPT_PACKET_SIZE: | |
402 | val = dp->dccps_packet_size; | |
88f964db | 403 | len = sizeof(dp->dccps_packet_size); |
a84ffe43 | 404 | break; |
88f964db ACM |
405 | case DCCP_SOCKOPT_SERVICE: |
406 | return dccp_getsockopt_service(sk, len, | |
407 | (u32 __user *)optval, optlen); | |
408 | case 128 ... 191: | |
409 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, | |
410 | len, (u32 __user *)optval, optlen); | |
411 | case 192 ... 255: | |
412 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, | |
413 | len, (u32 __user *)optval, optlen); | |
a84ffe43 ACM |
414 | default: |
415 | return -ENOPROTOOPT; | |
416 | } | |
417 | ||
418 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
419 | return -EFAULT; | |
420 | ||
421 | return 0; | |
7c657876 ACM |
422 | } |
423 | ||
f21e68ca ACM |
424 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
425 | ||
7c657876 ACM |
426 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
427 | size_t len) | |
428 | { | |
429 | const struct dccp_sock *dp = dccp_sk(sk); | |
430 | const int flags = msg->msg_flags; | |
431 | const int noblock = flags & MSG_DONTWAIT; | |
432 | struct sk_buff *skb; | |
433 | int rc, size; | |
434 | long timeo; | |
435 | ||
436 | if (len > dp->dccps_mss_cache) | |
437 | return -EMSGSIZE; | |
438 | ||
439 | lock_sock(sk); | |
27258ee5 | 440 | timeo = sock_sndtimeo(sk, noblock); |
7c657876 ACM |
441 | |
442 | /* | |
443 | * We have to use sk_stream_wait_connect here to set sk_write_pending, | |
444 | * so that the trick in dccp_rcv_request_sent_state_process. | |
445 | */ | |
446 | /* Wait for a connection to finish. */ | |
447 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING)) | |
448 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) | |
27258ee5 | 449 | goto out_release; |
7c657876 ACM |
450 | |
451 | size = sk->sk_prot->max_header + len; | |
452 | release_sock(sk); | |
453 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
454 | lock_sock(sk); | |
7c657876 ACM |
455 | if (skb == NULL) |
456 | goto out_release; | |
457 | ||
458 | skb_reserve(skb, sk->sk_prot->max_header); | |
459 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
27258ee5 ACM |
460 | if (rc != 0) |
461 | goto out_discard; | |
462 | ||
d6809c12 | 463 | rc = dccp_write_xmit(sk, skb, &timeo); |
20472af9 ACM |
464 | /* |
465 | * XXX we don't use sk_write_queue, so just discard the packet. | |
466 | * Current plan however is to _use_ sk_write_queue with | |
467 | * an algorith similar to tcp_sendmsg, where the main difference | |
468 | * is that in DCCP we have to respect packet boundaries, so | |
469 | * no coalescing of skbs. | |
470 | * | |
471 | * This bug was _quickly_ found & fixed by just looking at an OSTRA | |
472 | * generated callgraph 8) -acme | |
473 | */ | |
7c657876 ACM |
474 | out_release: |
475 | release_sock(sk); | |
476 | return rc ? : len; | |
27258ee5 ACM |
477 | out_discard: |
478 | kfree_skb(skb); | |
7c657876 | 479 | goto out_release; |
7c657876 ACM |
480 | } |
481 | ||
f21e68ca ACM |
482 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
483 | ||
7c657876 ACM |
484 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
485 | size_t len, int nonblock, int flags, int *addr_len) | |
486 | { | |
487 | const struct dccp_hdr *dh; | |
7c657876 ACM |
488 | long timeo; |
489 | ||
490 | lock_sock(sk); | |
491 | ||
531669a0 ACM |
492 | if (sk->sk_state == DCCP_LISTEN) { |
493 | len = -ENOTCONN; | |
7c657876 | 494 | goto out; |
7c657876 | 495 | } |
7c657876 | 496 | |
531669a0 | 497 | timeo = sock_rcvtimeo(sk, nonblock); |
7c657876 ACM |
498 | |
499 | do { | |
531669a0 | 500 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
7c657876 | 501 | |
531669a0 ACM |
502 | if (skb == NULL) |
503 | goto verify_sock_status; | |
7c657876 | 504 | |
531669a0 | 505 | dh = dccp_hdr(skb); |
7c657876 | 506 | |
531669a0 ACM |
507 | if (dh->dccph_type == DCCP_PKT_DATA || |
508 | dh->dccph_type == DCCP_PKT_DATAACK) | |
509 | goto found_ok_skb; | |
7c657876 | 510 | |
531669a0 ACM |
511 | if (dh->dccph_type == DCCP_PKT_RESET || |
512 | dh->dccph_type == DCCP_PKT_CLOSE) { | |
513 | dccp_pr_debug("found fin ok!\n"); | |
514 | len = 0; | |
515 | goto found_fin_ok; | |
516 | } | |
517 | dccp_pr_debug("packet_type=%s\n", | |
518 | dccp_packet_name(dh->dccph_type)); | |
519 | sk_eat_skb(sk, skb); | |
520 | verify_sock_status: | |
521 | if (sock_flag(sk, SOCK_DONE)) { | |
522 | len = 0; | |
7c657876 | 523 | break; |
531669a0 | 524 | } |
7c657876 | 525 | |
531669a0 ACM |
526 | if (sk->sk_err) { |
527 | len = sock_error(sk); | |
528 | break; | |
529 | } | |
7c657876 | 530 | |
531669a0 ACM |
531 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
532 | len = 0; | |
533 | break; | |
534 | } | |
7c657876 | 535 | |
531669a0 ACM |
536 | if (sk->sk_state == DCCP_CLOSED) { |
537 | if (!sock_flag(sk, SOCK_DONE)) { | |
538 | /* This occurs when user tries to read | |
539 | * from never connected socket. | |
540 | */ | |
541 | len = -ENOTCONN; | |
7c657876 ACM |
542 | break; |
543 | } | |
531669a0 ACM |
544 | len = 0; |
545 | break; | |
7c657876 ACM |
546 | } |
547 | ||
531669a0 ACM |
548 | if (!timeo) { |
549 | len = -EAGAIN; | |
550 | break; | |
551 | } | |
7c657876 | 552 | |
531669a0 ACM |
553 | if (signal_pending(current)) { |
554 | len = sock_intr_errno(timeo); | |
555 | break; | |
556 | } | |
7c657876 | 557 | |
531669a0 | 558 | sk_wait_data(sk, &timeo); |
7c657876 | 559 | continue; |
7c657876 | 560 | found_ok_skb: |
531669a0 ACM |
561 | if (len > skb->len) |
562 | len = skb->len; | |
563 | else if (len < skb->len) | |
564 | msg->msg_flags |= MSG_TRUNC; | |
565 | ||
566 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { | |
567 | /* Exception. Bailout! */ | |
568 | len = -EFAULT; | |
569 | break; | |
7c657876 | 570 | } |
7c657876 ACM |
571 | found_fin_ok: |
572 | if (!(flags & MSG_PEEK)) | |
573 | sk_eat_skb(sk, skb); | |
574 | break; | |
531669a0 | 575 | } while (1); |
7c657876 ACM |
576 | out: |
577 | release_sock(sk); | |
531669a0 | 578 | return len; |
7c657876 ACM |
579 | } |
580 | ||
f21e68ca ACM |
581 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
582 | ||
583 | int inet_dccp_listen(struct socket *sock, int backlog) | |
7c657876 ACM |
584 | { |
585 | struct sock *sk = sock->sk; | |
586 | unsigned char old_state; | |
587 | int err; | |
588 | ||
589 | lock_sock(sk); | |
590 | ||
591 | err = -EINVAL; | |
592 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) | |
593 | goto out; | |
594 | ||
595 | old_state = sk->sk_state; | |
596 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) | |
597 | goto out; | |
598 | ||
599 | /* Really, if the socket is already in listen state | |
600 | * we can only allow the backlog to be adjusted. | |
601 | */ | |
602 | if (old_state != DCCP_LISTEN) { | |
603 | /* | |
604 | * FIXME: here it probably should be sk->sk_prot->listen_start | |
605 | * see tcp_listen_start | |
606 | */ | |
607 | err = dccp_listen_start(sk); | |
608 | if (err) | |
609 | goto out; | |
610 | } | |
611 | sk->sk_max_ack_backlog = backlog; | |
612 | err = 0; | |
613 | ||
614 | out: | |
615 | release_sock(sk); | |
616 | return err; | |
617 | } | |
618 | ||
f21e68ca ACM |
619 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
620 | ||
7c657876 | 621 | static const unsigned char dccp_new_state[] = { |
7690af3f ACM |
622 | /* current state: new state: action: */ |
623 | [0] = DCCP_CLOSED, | |
624 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
625 | [DCCP_REQUESTING] = DCCP_CLOSED, | |
626 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, | |
627 | [DCCP_LISTEN] = DCCP_CLOSED, | |
628 | [DCCP_RESPOND] = DCCP_CLOSED, | |
629 | [DCCP_CLOSING] = DCCP_CLOSED, | |
630 | [DCCP_TIME_WAIT] = DCCP_CLOSED, | |
631 | [DCCP_CLOSED] = DCCP_CLOSED, | |
7c657876 ACM |
632 | }; |
633 | ||
634 | static int dccp_close_state(struct sock *sk) | |
635 | { | |
636 | const int next = dccp_new_state[sk->sk_state]; | |
637 | const int ns = next & DCCP_STATE_MASK; | |
638 | ||
639 | if (ns != sk->sk_state) | |
640 | dccp_set_state(sk, ns); | |
641 | ||
642 | return next & DCCP_ACTION_FIN; | |
643 | } | |
644 | ||
645 | void dccp_close(struct sock *sk, long timeout) | |
646 | { | |
647 | struct sk_buff *skb; | |
648 | ||
649 | lock_sock(sk); | |
650 | ||
651 | sk->sk_shutdown = SHUTDOWN_MASK; | |
652 | ||
653 | if (sk->sk_state == DCCP_LISTEN) { | |
654 | dccp_set_state(sk, DCCP_CLOSED); | |
655 | ||
656 | /* Special case. */ | |
657 | inet_csk_listen_stop(sk); | |
658 | ||
659 | goto adjudge_to_death; | |
660 | } | |
661 | ||
662 | /* | |
663 | * We need to flush the recv. buffs. We do this only on the | |
664 | * descriptor close, not protocol-sourced closes, because the | |
665 | *reader process may not have drained the data yet! | |
666 | */ | |
667 | /* FIXME: check for unread data */ | |
668 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
669 | __kfree_skb(skb); | |
670 | } | |
671 | ||
672 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
673 | /* Check zero linger _after_ checking for unread data. */ | |
674 | sk->sk_prot->disconnect(sk, 0); | |
675 | } else if (dccp_close_state(sk)) { | |
7ad07e7c | 676 | dccp_send_close(sk, 1); |
7c657876 ACM |
677 | } |
678 | ||
679 | sk_stream_wait_close(sk, timeout); | |
680 | ||
681 | adjudge_to_death: | |
7ad07e7c ACM |
682 | /* |
683 | * It is the last release_sock in its life. It will remove backlog. | |
684 | */ | |
7c657876 ACM |
685 | release_sock(sk); |
686 | /* | |
687 | * Now socket is owned by kernel and we acquire BH lock | |
688 | * to finish close. No need to check for user refs. | |
689 | */ | |
690 | local_bh_disable(); | |
691 | bh_lock_sock(sk); | |
692 | BUG_TRAP(!sock_owned_by_user(sk)); | |
693 | ||
694 | sock_hold(sk); | |
695 | sock_orphan(sk); | |
7ad07e7c ACM |
696 | |
697 | /* | |
698 | * The last release_sock may have processed the CLOSE or RESET | |
699 | * packet moving sock to CLOSED state, if not we have to fire | |
700 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" | |
701 | * in draft-ietf-dccp-spec-11. -acme | |
702 | */ | |
703 | if (sk->sk_state == DCCP_CLOSING) { | |
704 | /* FIXME: should start at 2 * RTT */ | |
705 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ | |
706 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
707 | inet_csk(sk)->icsk_rto, | |
708 | DCCP_RTO_MAX); | |
709 | #if 0 | |
710 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ | |
7c657876 | 711 | dccp_set_state(sk, DCCP_CLOSED); |
7ad07e7c ACM |
712 | #endif |
713 | } | |
7c657876 | 714 | |
7ad07e7c | 715 | atomic_inc(sk->sk_prot->orphan_count); |
7c657876 ACM |
716 | if (sk->sk_state == DCCP_CLOSED) |
717 | inet_csk_destroy_sock(sk); | |
718 | ||
719 | /* Otherwise, socket is reprieved until protocol close. */ | |
720 | ||
721 | bh_unlock_sock(sk); | |
722 | local_bh_enable(); | |
723 | sock_put(sk); | |
724 | } | |
725 | ||
f21e68ca ACM |
726 | EXPORT_SYMBOL_GPL(dccp_close); |
727 | ||
7c657876 ACM |
728 | void dccp_shutdown(struct sock *sk, int how) |
729 | { | |
730 | dccp_pr_debug("entry\n"); | |
731 | } | |
732 | ||
f21e68ca ACM |
733 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
734 | ||
90ddc4f0 | 735 | static const struct proto_ops inet_dccp_ops = { |
7c657876 ACM |
736 | .family = PF_INET, |
737 | .owner = THIS_MODULE, | |
738 | .release = inet_release, | |
739 | .bind = inet_bind, | |
740 | .connect = inet_stream_connect, | |
741 | .socketpair = sock_no_socketpair, | |
742 | .accept = inet_accept, | |
743 | .getname = inet_getname, | |
331968bd ACM |
744 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
745 | .poll = dccp_poll, | |
7c657876 | 746 | .ioctl = inet_ioctl, |
7690af3f ACM |
747 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
748 | .listen = inet_dccp_listen, | |
7c657876 ACM |
749 | .shutdown = inet_shutdown, |
750 | .setsockopt = sock_common_setsockopt, | |
751 | .getsockopt = sock_common_getsockopt, | |
752 | .sendmsg = inet_sendmsg, | |
753 | .recvmsg = sock_common_recvmsg, | |
754 | .mmap = sock_no_mmap, | |
755 | .sendpage = sock_no_sendpage, | |
756 | }; | |
757 | ||
758 | extern struct net_proto_family inet_family_ops; | |
759 | ||
760 | static struct inet_protosw dccp_v4_protosw = { | |
761 | .type = SOCK_DCCP, | |
762 | .protocol = IPPROTO_DCCP, | |
34ca6860 | 763 | .prot = &dccp_prot, |
7c657876 ACM |
764 | .ops = &inet_dccp_ops, |
765 | .capability = -1, | |
766 | .no_check = 0, | |
d83d8461 | 767 | .flags = INET_PROTOSW_ICSK, |
7c657876 ACM |
768 | }; |
769 | ||
770 | /* | |
771 | * This is the global socket data structure used for responding to | |
772 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
773 | * for this socket at the initialization time. | |
774 | */ | |
775 | struct socket *dccp_ctl_socket; | |
776 | ||
777 | static char dccp_ctl_socket_err_msg[] __initdata = | |
778 | KERN_ERR "DCCP: Failed to create the control socket.\n"; | |
779 | ||
780 | static int __init dccp_ctl_sock_init(void) | |
781 | { | |
782 | int rc = sock_create_kern(PF_INET, SOCK_DCCP, IPPROTO_DCCP, | |
783 | &dccp_ctl_socket); | |
784 | if (rc < 0) | |
785 | printk(dccp_ctl_socket_err_msg); | |
786 | else { | |
787 | dccp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; | |
788 | inet_sk(dccp_ctl_socket->sk)->uc_ttl = -1; | |
789 | ||
790 | /* Unhash it so that IP input processing does not even | |
791 | * see it, we do not wish this socket to see incoming | |
792 | * packets. | |
793 | */ | |
794 | dccp_ctl_socket->sk->sk_prot->unhash(dccp_ctl_socket->sk); | |
795 | } | |
796 | ||
797 | return rc; | |
798 | } | |
799 | ||
725ba8ee ACM |
800 | #ifdef CONFIG_IP_DCCP_UNLOAD_HACK |
801 | void dccp_ctl_sock_exit(void) | |
7c657876 | 802 | { |
5480855b | 803 | if (dccp_ctl_socket != NULL) { |
7c657876 | 804 | sock_release(dccp_ctl_socket); |
5480855b ACM |
805 | dccp_ctl_socket = NULL; |
806 | } | |
7c657876 ACM |
807 | } |
808 | ||
725ba8ee ACM |
809 | EXPORT_SYMBOL_GPL(dccp_ctl_sock_exit); |
810 | #endif | |
811 | ||
7c657876 ACM |
812 | static int __init init_dccp_v4_mibs(void) |
813 | { | |
814 | int rc = -ENOMEM; | |
815 | ||
816 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); | |
817 | if (dccp_statistics[0] == NULL) | |
818 | goto out; | |
819 | ||
820 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); | |
821 | if (dccp_statistics[1] == NULL) | |
822 | goto out_free_one; | |
823 | ||
824 | rc = 0; | |
825 | out: | |
826 | return rc; | |
827 | out_free_one: | |
828 | free_percpu(dccp_statistics[0]); | |
829 | dccp_statistics[0] = NULL; | |
830 | goto out; | |
831 | ||
832 | } | |
833 | ||
834 | static int thash_entries; | |
835 | module_param(thash_entries, int, 0444); | |
836 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); | |
837 | ||
a1d3a355 | 838 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 ACM |
839 | int dccp_debug; |
840 | module_param(dccp_debug, int, 0444); | |
841 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); | |
f21e68ca ACM |
842 | |
843 | EXPORT_SYMBOL_GPL(dccp_debug); | |
a1d3a355 | 844 | #endif |
7c657876 ACM |
845 | |
846 | static int __init dccp_init(void) | |
847 | { | |
848 | unsigned long goal; | |
849 | int ehash_order, bhash_order, i; | |
34ca6860 | 850 | int rc = proto_register(&dccp_prot, 1); |
7c657876 ACM |
851 | |
852 | if (rc) | |
853 | goto out; | |
854 | ||
fa23e2ec | 855 | rc = -ENOBUFS; |
7690af3f ACM |
856 | dccp_hashinfo.bind_bucket_cachep = |
857 | kmem_cache_create("dccp_bind_bucket", | |
858 | sizeof(struct inet_bind_bucket), 0, | |
859 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
7c657876 ACM |
860 | if (!dccp_hashinfo.bind_bucket_cachep) |
861 | goto out_proto_unregister; | |
862 | ||
863 | /* | |
864 | * Size and allocate the main established and bind bucket | |
865 | * hash tables. | |
866 | * | |
867 | * The methodology is similar to that of the buffer cache. | |
868 | */ | |
869 | if (num_physpages >= (128 * 1024)) | |
870 | goal = num_physpages >> (21 - PAGE_SHIFT); | |
871 | else | |
872 | goal = num_physpages >> (23 - PAGE_SHIFT); | |
873 | ||
874 | if (thash_entries) | |
7690af3f ACM |
875 | goal = (thash_entries * |
876 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; | |
7c657876 ACM |
877 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
878 | ; | |
879 | do { | |
880 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / | |
881 | sizeof(struct inet_ehash_bucket); | |
882 | dccp_hashinfo.ehash_size >>= 1; | |
7690af3f ACM |
883 | while (dccp_hashinfo.ehash_size & |
884 | (dccp_hashinfo.ehash_size - 1)) | |
7c657876 ACM |
885 | dccp_hashinfo.ehash_size--; |
886 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) | |
887 | __get_free_pages(GFP_ATOMIC, ehash_order); | |
888 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); | |
889 | ||
890 | if (!dccp_hashinfo.ehash) { | |
891 | printk(KERN_CRIT "Failed to allocate DCCP " | |
892 | "established hash table\n"); | |
893 | goto out_free_bind_bucket_cachep; | |
894 | } | |
895 | ||
896 | for (i = 0; i < (dccp_hashinfo.ehash_size << 1); i++) { | |
897 | rwlock_init(&dccp_hashinfo.ehash[i].lock); | |
898 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); | |
899 | } | |
900 | ||
901 | bhash_order = ehash_order; | |
902 | ||
903 | do { | |
904 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / | |
905 | sizeof(struct inet_bind_hashbucket); | |
7690af3f ACM |
906 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
907 | bhash_order > 0) | |
7c657876 ACM |
908 | continue; |
909 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) | |
910 | __get_free_pages(GFP_ATOMIC, bhash_order); | |
911 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); | |
912 | ||
913 | if (!dccp_hashinfo.bhash) { | |
914 | printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n"); | |
915 | goto out_free_dccp_ehash; | |
916 | } | |
917 | ||
918 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { | |
919 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); | |
920 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); | |
921 | } | |
922 | ||
fa23e2ec ACM |
923 | rc = init_dccp_v4_mibs(); |
924 | if (rc) | |
7c657876 ACM |
925 | goto out_free_dccp_bhash; |
926 | ||
927 | rc = -EAGAIN; | |
928 | if (inet_add_protocol(&dccp_protocol, IPPROTO_DCCP)) | |
929 | goto out_free_dccp_v4_mibs; | |
930 | ||
931 | inet_register_protosw(&dccp_v4_protosw); | |
932 | ||
9b07ef5d | 933 | rc = dccp_ackvec_init(); |
7c657876 ACM |
934 | if (rc) |
935 | goto out_unregister_protosw; | |
9b07ef5d ACM |
936 | |
937 | rc = dccp_ctl_sock_init(); | |
938 | if (rc) | |
939 | goto out_ackvec_exit; | |
7c657876 ACM |
940 | out: |
941 | return rc; | |
9b07ef5d ACM |
942 | out_ackvec_exit: |
943 | dccp_ackvec_exit(); | |
7c657876 ACM |
944 | out_unregister_protosw: |
945 | inet_unregister_protosw(&dccp_v4_protosw); | |
946 | inet_del_protocol(&dccp_protocol, IPPROTO_DCCP); | |
947 | out_free_dccp_v4_mibs: | |
948 | free_percpu(dccp_statistics[0]); | |
949 | free_percpu(dccp_statistics[1]); | |
950 | dccp_statistics[0] = dccp_statistics[1] = NULL; | |
951 | out_free_dccp_bhash: | |
952 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); | |
953 | dccp_hashinfo.bhash = NULL; | |
954 | out_free_dccp_ehash: | |
955 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); | |
956 | dccp_hashinfo.ehash = NULL; | |
957 | out_free_bind_bucket_cachep: | |
958 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); | |
959 | dccp_hashinfo.bind_bucket_cachep = NULL; | |
960 | out_proto_unregister: | |
34ca6860 | 961 | proto_unregister(&dccp_prot); |
7c657876 ACM |
962 | goto out; |
963 | } | |
964 | ||
965 | static const char dccp_del_proto_err_msg[] __exitdata = | |
966 | KERN_ERR "can't remove dccp net_protocol\n"; | |
967 | ||
968 | static void __exit dccp_fini(void) | |
969 | { | |
7c657876 ACM |
970 | inet_unregister_protosw(&dccp_v4_protosw); |
971 | ||
972 | if (inet_del_protocol(&dccp_protocol, IPPROTO_DCCP) < 0) | |
973 | printk(dccp_del_proto_err_msg); | |
974 | ||
725ba8ee ACM |
975 | free_percpu(dccp_statistics[0]); |
976 | free_percpu(dccp_statistics[1]); | |
977 | free_pages((unsigned long)dccp_hashinfo.bhash, | |
978 | get_order(dccp_hashinfo.bhash_size * | |
979 | sizeof(struct inet_bind_hashbucket))); | |
980 | free_pages((unsigned long)dccp_hashinfo.ehash, | |
981 | get_order(dccp_hashinfo.ehash_size * | |
982 | sizeof(struct inet_ehash_bucket))); | |
7c657876 | 983 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
34ca6860 | 984 | proto_unregister(&dccp_prot); |
9b07ef5d | 985 | dccp_ackvec_exit(); |
7c657876 ACM |
986 | } |
987 | ||
988 | module_init(dccp_init); | |
989 | module_exit(dccp_fini); | |
990 | ||
bb97d31f ACM |
991 | /* |
992 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
993 | * values directly, Also cover the case where the protocol is not specified, | |
994 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
995 | */ | |
996 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
997 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
7c657876 ACM |
998 | MODULE_LICENSE("GPL"); |
999 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); | |
1000 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |