source: mainline/uspace/srv/net/tcp/ucall.c@ 2f19103

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 2f19103 was 2f19103, checked in by Jiri Svoboda <jiri@…>, 10 years ago

TCP and UDP servers can make use of inet/endpoint.h types internally.
  • Property mode set to 100644
File size: 9.0 KB
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1/*
2 * Copyright (c) 2015 Jiri Svoboda
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup tcp
30 * @{
31 */
32
33/**
34 * @file TCP entry points (close to those defined in the RFC)
35 */
36
37#include <fibril_synch.h>
38#include <io/log.h>
39#include <macros.h>
40#include <mem.h>
41#include "conn.h"
42#include "tcp_type.h"
43#include "tqueue.h"
44#include "ucall.h"
45
46/*
47 * User calls
48 */
49
50/** OPEN user call
51 *
52 * @param epp Endpoint pair
53 * @param acpass Active/passive
54 * @param oflags Open flags
55 * @param conn Connection
56 *
57 * Unlike in the spec we allow specifying the local address. This means
58 * the implementation does not need to magically guess it, especially
59 * considering there can be more than one local address.
60 *
61 * XXX We should be able to call active open on an existing listening
62 * connection.
63 * XXX We should be able to get connection structure immediately, before
64 * establishment.
65 */
66tcp_error_t tcp_uc_open(inet_ep2_t *epp, acpass_t acpass,
67 tcp_open_flags_t oflags, tcp_conn_t **conn)
68{
69 tcp_conn_t *nconn;
70
71 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open(%p, %s, %s, %p)",
72 epp, acpass == ap_active ? "active" : "passive",
73 oflags == tcp_open_nonblock ? "nonblock" : "none", conn);
74
75 nconn = tcp_conn_new(epp);
76 tcp_conn_add(nconn);
77 tcp_conn_lock(nconn);
78
79 if (acpass == ap_active) {
80 /* Synchronize (initiate) connection */
81 tcp_conn_sync(nconn);
82 }
83
84 if (oflags == tcp_open_nonblock) {
85 tcp_conn_unlock(nconn);
86 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open -> %p", nconn);
87 *conn = nconn;
88 return TCP_EOK;
89 }
90
91 /* Wait for connection to be established or reset */
92 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open: Wait for connection.");
93 while (nconn->cstate == st_listen ||
94 nconn->cstate == st_syn_sent ||
95 nconn->cstate == st_syn_received) {
96 fibril_condvar_wait(&nconn->cstate_cv, &nconn->lock);
97 }
98
99 if (nconn->cstate != st_established) {
100 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open: Connection was reset.");
101 assert(nconn->cstate == st_closed);
102 tcp_conn_unlock(nconn);
103 return TCP_ERESET;
104 }
105
106 tcp_conn_unlock(nconn);
107 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open: Connection was established.");
108
109 *conn = nconn;
110 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open -> %p", nconn);
111 return TCP_EOK;
112}
113
114/** SEND user call */
115tcp_error_t tcp_uc_send(tcp_conn_t *conn, void *data, size_t size,
116 xflags_t flags)
117{
118 size_t buf_free;
119 size_t xfer_size;
120
121 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_send()", conn->name);
122
123 tcp_conn_lock(conn);
124
125 if (conn->cstate == st_closed) {
126 tcp_conn_unlock(conn);
127 return TCP_ENOTEXIST;
128 }
129
130 if (conn->cstate == st_listen) {
131 /* Change connection to active */
132 tcp_conn_sync(conn);
133 }
134
135
136 if (conn->snd_buf_fin) {
137 tcp_conn_unlock(conn);
138 return TCP_ECLOSING;
139 }
140
141 while (size > 0) {
142 buf_free = conn->snd_buf_size - conn->snd_buf_used;
143 while (buf_free == 0 && !conn->reset) {
144 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: buf_free == 0, waiting.",
145 conn->name);
146 fibril_condvar_wait(&conn->snd_buf_cv, &conn->lock);
147 buf_free = conn->snd_buf_size - conn->snd_buf_used;
148 }
149
150 if (conn->reset) {
151 tcp_conn_unlock(conn);
152 return TCP_ERESET;
153 }
154
155 xfer_size = min(size, buf_free);
156
157 /* Copy data to buffer */
158 memcpy(conn->snd_buf + conn->snd_buf_used, data, xfer_size);
159 data += xfer_size;
160 conn->snd_buf_used += xfer_size;
161 size -= xfer_size;
162
163 tcp_tqueue_new_data(conn);
164 }
165
166 tcp_tqueue_new_data(conn);
167 tcp_conn_unlock(conn);
168
169 return TCP_EOK;
170}
171
172/** RECEIVE user call */
173tcp_error_t tcp_uc_receive(tcp_conn_t *conn, void *buf, size_t size,
174 size_t *rcvd, xflags_t *xflags)
175{
176 size_t xfer_size;
177
178 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_receive()", conn->name);
179
180 tcp_conn_lock(conn);
181
182 if (conn->cstate == st_closed) {
183 tcp_conn_unlock(conn);
184 return TCP_ENOTEXIST;
185 }
186
187 /* Wait for data to become available */
188 while (conn->rcv_buf_used == 0 && !conn->rcv_buf_fin && !conn->reset) {
189 tcp_conn_unlock(conn);
190 return TCP_EAGAIN;
191 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_receive() - wait for data");
192 fibril_condvar_wait(&conn->rcv_buf_cv, &conn->lock);
193 }
194
195 if (conn->rcv_buf_used == 0) {
196 *rcvd = 0;
197 *xflags = 0;
198
199 if (conn->rcv_buf_fin) {
200 /* End of data, peer closed connection */
201 tcp_conn_unlock(conn);
202 return TCP_ECLOSING;
203 } else {
204 /* Connection was reset */
205 assert(conn->reset);
206 tcp_conn_unlock(conn);
207 return TCP_ERESET;
208 }
209 }
210
211 /* Copy data from receive buffer to user buffer */
212 xfer_size = min(size, conn->rcv_buf_used);
213 memcpy(buf, conn->rcv_buf, xfer_size);
214 *rcvd = xfer_size;
215
216 /* Remove data from receive buffer */
217 memmove(conn->rcv_buf, conn->rcv_buf + xfer_size, conn->rcv_buf_used -
218 xfer_size);
219 conn->rcv_buf_used -= xfer_size;
220 conn->rcv_wnd += xfer_size;
221
222 /* TODO */
223 *xflags = 0;
224
225 /* Send new size of receive window */
226 tcp_tqueue_ctrl_seg(conn, CTL_ACK);
227
228 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_receive() - returning %zu bytes",
229 conn->name, xfer_size);
230
231 tcp_conn_unlock(conn);
232
233 return TCP_EOK;
234}
235
236/** CLOSE user call */
237tcp_error_t tcp_uc_close(tcp_conn_t *conn)
238{
239 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_close(%p)", conn->name,
240 conn);
241
242 tcp_conn_lock(conn);
243
244 if (conn->cstate == st_closed) {
245 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_close - ENOTEXIST");
246 tcp_conn_unlock(conn);
247 return TCP_ENOTEXIST;
248 }
249
250 if (conn->cstate == st_listen || conn->cstate == st_syn_sent) {
251 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_close - listen/syn_sent");
252 tcp_conn_reset(conn);
253 tcp_conn_remove(conn);
254 tcp_conn_unlock(conn);
255 return TCP_EOK;
256 }
257
258 if (conn->snd_buf_fin) {
259 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_close - ECLOSING");
260 tcp_conn_unlock(conn);
261 return TCP_ECLOSING;
262 }
263
264 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_close - set snd_buf_fin");
265 conn->snd_buf_fin = true;
266 tcp_tqueue_new_data(conn);
267
268 tcp_conn_unlock(conn);
269 return TCP_EOK;
270}
271
272/** ABORT user call */
273void tcp_uc_abort(tcp_conn_t *conn)
274{
275 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_abort()");
276}
277
278/** STATUS user call */
279void tcp_uc_status(tcp_conn_t *conn, tcp_conn_status_t *cstatus)
280{
281 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_status()");
282 cstatus->cstate = conn->cstate;
283}
284
285/** Delete connection user call.
286 *
287 * (Not in spec.) Inform TCP that the user is done with this connection
288 * and will not make any further calls/references to it. TCP can deallocate
289 * the connection from now on.
290 */
291void tcp_uc_delete(tcp_conn_t *conn)
292{
293 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_delete()");
294 tcp_conn_delete(conn);
295}
296
297void tcp_uc_set_cb(tcp_conn_t *conn, tcp_cb_t *cb, void *arg)
298{
299 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_set_cb(%p, %p, %p)",
300 conn, cb, arg);
301
302 conn->cb = cb;
303 conn->cb_arg = arg;
304}
305
306void *tcp_uc_get_userptr(tcp_conn_t *conn)
307{
308 return conn->cb_arg;
309}
310
311/*
312 * Arriving segments
313 */
314
315/** Segment arrived */
316void tcp_as_segment_arrived(inet_ep2_t *epp, tcp_segment_t *seg)
317{
318 tcp_conn_t *conn;
319
320 log_msg(LOG_DEFAULT, LVL_DEBUG,
321 "tcp_as_segment_arrived(f:(%u), l:(%u))",
322 epp->remote.port, epp->local.port);
323
324 conn = tcp_conn_find_ref(epp);
325 if (conn == NULL) {
326 log_msg(LOG_DEFAULT, LVL_WARN, "No connection found.");
327 tcp_unexpected_segment(epp, seg);
328 return;
329 }
330
331 tcp_conn_lock(conn);
332
333 if (conn->cstate == st_closed) {
334 log_msg(LOG_DEFAULT, LVL_WARN, "Connection is closed.");
335 tcp_unexpected_segment(epp, seg);
336 tcp_conn_unlock(conn);
337 tcp_conn_delref(conn);
338 return;
339 }
340
341 if (inet_addr_is_any(&conn->ident.remote.addr))
342 conn->ident.remote.addr = epp->remote.addr;
343
344 if (conn->ident.remote.port == TCP_PORT_ANY)
345 conn->ident.remote.port = epp->remote.port;
346
347 if (inet_addr_is_any(&conn->ident.local.addr))
348 conn->ident.local.addr = epp->local.addr;
349
350 tcp_conn_segment_arrived(conn, seg);
351
352 tcp_conn_unlock(conn);
353 tcp_conn_delref(conn);
354}
355
356/*
357 * Timeouts
358 */
359
360/** User timeout */
361void tcp_to_user(void)
362{
363 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_to_user()");
364}
365
366/**
367 * @}
368 */
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