source: mainline/uspace/srv/net/tcp/ucall.c@ 12df1f1

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 12df1f1 was a2e3ee6, checked in by Martin Decky <martin@…>, 12 years ago

use new network address infrastructure (towards IPv6 support)
  • Property mode set to 100644
File size: 8.6 KB
Line 
1/*
2 * Copyright (c) 2011 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 lsock Local socket
53 * @param fsock Foreign socket
54 * @param acpass Active/passive
55 * @param oflags Open flags
56 * @param conn Connection
57 *
58 * Unlike in the spec we allow specifying the local address. This means
59 * the implementation does not need to magically guess it, especially
60 * considering there can be more than one local address.
61 *
62 * XXX We should be able to call active open on an existing listening
63 * connection.
64 * XXX We should be able to get connection structure immediately, before
65 * establishment.
66 */
67tcp_error_t tcp_uc_open(tcp_sock_t *lsock, tcp_sock_t *fsock, acpass_t acpass,
68 tcp_open_flags_t oflags, tcp_conn_t **conn)
69{
70 tcp_conn_t *nconn;
71
72 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open(%p, %p, %s, %s, %p)",
73 lsock, fsock, acpass == ap_active ? "active" : "passive",
74 oflags == tcp_open_nonblock ? "nonblock" : "none", conn);
75
76 nconn = tcp_conn_new(lsock, fsock);
77 tcp_conn_add(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 *conn = nconn;
86 return TCP_EOK;
87 }
88
89 /* Wait for connection to be established or reset */
90 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open: Wait for connection.");
91 fibril_mutex_lock(&nconn->lock);
92 while (nconn->cstate == st_listen ||
93 nconn->cstate == st_syn_sent ||
94 nconn->cstate == st_syn_received) {
95 fibril_condvar_wait(&nconn->cstate_cv, &nconn->lock);
96 }
97
98 if (nconn->cstate != st_established) {
99 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open: Connection was reset.");
100 assert(nconn->cstate == st_closed);
101 fibril_mutex_unlock(&nconn->lock);
102 return TCP_ERESET;
103 }
104
105 fibril_mutex_unlock(&nconn->lock);
106 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open: Connection was established.");
107
108 *conn = nconn;
109 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_open -> %p", nconn);
110 return TCP_EOK;
111}
112
113/** SEND user call */
114tcp_error_t tcp_uc_send(tcp_conn_t *conn, void *data, size_t size,
115 xflags_t flags)
116{
117 size_t buf_free;
118 size_t xfer_size;
119
120 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_send()", conn->name);
121
122 fibril_mutex_lock(&conn->lock);
123
124 if (conn->cstate == st_closed) {
125 fibril_mutex_unlock(&conn->lock);
126 return TCP_ENOTEXIST;
127 }
128
129 if (conn->cstate == st_listen) {
130 /* Change connection to active */
131 tcp_conn_sync(conn);
132 }
133
134
135 if (conn->snd_buf_fin) {
136 fibril_mutex_unlock(&conn->lock);
137 return TCP_ECLOSING;
138 }
139
140 while (size > 0) {
141 buf_free = conn->snd_buf_size - conn->snd_buf_used;
142 while (buf_free == 0 && !conn->reset) {
143 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: buf_free == 0, waiting.",
144 conn->name);
145 fibril_condvar_wait(&conn->snd_buf_cv, &conn->lock);
146 buf_free = conn->snd_buf_size - conn->snd_buf_used;
147 }
148
149 if (conn->reset) {
150 fibril_mutex_unlock(&conn->lock);
151 return TCP_ERESET;
152 }
153
154 xfer_size = min(size, buf_free);
155
156 /* Copy data to buffer */
157 memcpy(conn->snd_buf + conn->snd_buf_used, data, xfer_size);
158 data += xfer_size;
159 conn->snd_buf_used += xfer_size;
160 size -= xfer_size;
161
162 tcp_tqueue_new_data(conn);
163 }
164
165 tcp_tqueue_new_data(conn);
166 fibril_mutex_unlock(&conn->lock);
167
168 return TCP_EOK;
169}
170
171/** RECEIVE user call */
172tcp_error_t tcp_uc_receive(tcp_conn_t *conn, void *buf, size_t size,
173 size_t *rcvd, xflags_t *xflags)
174{
175 size_t xfer_size;
176
177 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_receive()", conn->name);
178
179 fibril_mutex_lock(&conn->lock);
180
181 if (conn->cstate == st_closed) {
182 fibril_mutex_unlock(&conn->lock);
183 return TCP_ENOTEXIST;
184 }
185
186 /* Wait for data to become available */
187 while (conn->rcv_buf_used == 0 && !conn->rcv_buf_fin && !conn->reset) {
188 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_receive() - wait for data");
189 fibril_condvar_wait(&conn->rcv_buf_cv, &conn->lock);
190 }
191
192 if (conn->rcv_buf_used == 0) {
193 *rcvd = 0;
194 *xflags = 0;
195
196 if (conn->rcv_buf_fin) {
197 /* End of data, peer closed connection */
198 fibril_mutex_unlock(&conn->lock);
199 return TCP_ECLOSING;
200 } else {
201 /* Connection was reset */
202 assert(conn->reset);
203 fibril_mutex_unlock(&conn->lock);
204 return TCP_ERESET;
205 }
206 }
207
208 /* Copy data from receive buffer to user buffer */
209 xfer_size = min(size, conn->rcv_buf_used);
210 memcpy(buf, conn->rcv_buf, xfer_size);
211 *rcvd = xfer_size;
212
213 /* Remove data from receive buffer */
214 memmove(conn->rcv_buf, conn->rcv_buf + xfer_size, conn->rcv_buf_used -
215 xfer_size);
216 conn->rcv_buf_used -= xfer_size;
217 conn->rcv_wnd += xfer_size;
218
219 /* TODO */
220 *xflags = 0;
221
222 /* Send new size of receive window */
223 tcp_tqueue_ctrl_seg(conn, CTL_ACK);
224
225 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_receive() - returning %zu bytes",
226 conn->name, xfer_size);
227
228 fibril_mutex_unlock(&conn->lock);
229
230 return TCP_EOK;
231}
232
233/** CLOSE user call */
234tcp_error_t tcp_uc_close(tcp_conn_t *conn)
235{
236 log_msg(LOG_DEFAULT, LVL_DEBUG, "%s: tcp_uc_close()", conn->name);
237
238 fibril_mutex_lock(&conn->lock);
239
240 if (conn->cstate == st_closed) {
241 fibril_mutex_unlock(&conn->lock);
242 return TCP_ENOTEXIST;
243 }
244
245 if (conn->snd_buf_fin) {
246 fibril_mutex_unlock(&conn->lock);
247 return TCP_ECLOSING;
248 }
249
250 conn->snd_buf_fin = true;
251 tcp_tqueue_new_data(conn);
252
253 fibril_mutex_unlock(&conn->lock);
254 return TCP_EOK;
255}
256
257/** ABORT user call */
258void tcp_uc_abort(tcp_conn_t *conn)
259{
260 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_abort()");
261}
262
263/** STATUS user call */
264void tcp_uc_status(tcp_conn_t *conn, tcp_conn_status_t *cstatus)
265{
266 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_status()");
267 cstatus->cstate = conn->cstate;
268}
269
270/** Delete connection user call.
271 *
272 * (Not in spec.) Inform TCP that the user is done with this connection
273 * and will not make any further calls/references to it. TCP can deallocate
274 * the connection from now on.
275 */
276void tcp_uc_delete(tcp_conn_t *conn)
277{
278 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_delete()");
279 tcp_conn_delete(conn);
280}
281
282void tcp_uc_set_cstate_cb(tcp_conn_t *conn, tcp_cstate_cb_t cb, void *arg)
283{
284 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_uc_set_ctate_cb(%p, %p, %p)",
285 conn, cb, arg);
286
287 conn->cstate_cb = cb;
288 conn->cstate_cb_arg = arg;
289}
290
291/*
292 * Arriving segments
293 */
294
295/** Segment arrived */
296void tcp_as_segment_arrived(tcp_sockpair_t *sp, tcp_segment_t *seg)
297{
298 tcp_conn_t *conn;
299
300 conn = tcp_conn_find_ref(sp);
301 if (conn == NULL) {
302 log_msg(LOG_DEFAULT, LVL_WARN, "No connection found.");
303 tcp_unexpected_segment(sp, seg);
304 return;
305 }
306
307 fibril_mutex_lock(&conn->lock);
308
309 if (conn->cstate == st_closed) {
310 log_msg(LOG_DEFAULT, LVL_WARN, "Connection is closed.");
311 tcp_unexpected_segment(sp, seg);
312 fibril_mutex_unlock(&conn->lock);
313 tcp_conn_delref(conn);
314 return;
315 }
316
317 if (inet_addr_is_any(&conn->ident.foreign.addr))
318 conn->ident.foreign.addr = sp->foreign.addr;
319
320 if (conn->ident.foreign.port == TCP_PORT_ANY)
321 conn->ident.foreign.port = sp->foreign.port;
322
323 if (inet_addr_is_any(&conn->ident.local.addr))
324 conn->ident.local.addr = sp->local.addr;
325
326 tcp_conn_segment_arrived(conn, seg);
327
328 fibril_mutex_unlock(&conn->lock);
329 tcp_conn_delref(conn);
330}
331
332/*
333 * Timeouts
334 */
335
336/** User timeout */
337void tcp_to_user(void)
338{
339 log_msg(LOG_DEFAULT, LVL_DEBUG, "tcp_to_user()");
340}
341
342/**
343 * @}
344 */
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