source: mainline/uspace/srv/net/inetsrv/inet_link.c@ 257feec

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 257feec was 257feec, checked in by Martin Decky <martin@…>, 12 years ago

cstyle (no change in functionality)
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File size: 7.8 KB
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1/*
2 * Copyright (c) 2012 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 inet
30 * @{
31 */
32/**
33 * @file
34 * @brief
35 */
36
37#include <stdbool.h>
38#include <errno.h>
39#include <fibril_synch.h>
40#include <inet/iplink.h>
41#include <io/log.h>
42#include <loc.h>
43#include <stdlib.h>
44#include <str.h>
45
46#include "addrobj.h"
47#include "inetsrv.h"
48#include "inet_link.h"
49#include "pdu.h"
50
51static int inet_link_open(service_id_t sid);
52static int inet_iplink_recv(iplink_t *ilink, iplink_sdu_t *sdu);
53
54static iplink_ev_ops_t inet_iplink_ev_ops = {
55 .recv = inet_iplink_recv
56};
57
58static LIST_INITIALIZE(inet_link_list);
59static FIBRIL_MUTEX_INITIALIZE(inet_discovery_lock);
60
61static int inet_iplink_recv(iplink_t *iplink, iplink_sdu_t *sdu)
62{
63 inet_packet_t packet;
64 int rc;
65
66 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_iplink_recv()");
67 rc = inet_pdu_decode(sdu->data, sdu->size, &packet);
68 if (rc != EOK) {
69 log_msg(LOG_DEFAULT, LVL_DEBUG, "failed decoding PDU");
70 return rc;
71 }
72
73 log_msg(LOG_DEFAULT, LVL_DEBUG, "call inet_recv_packet()");
74 rc = inet_recv_packet(&packet);
75 log_msg(LOG_DEFAULT, LVL_DEBUG, "call inet_recv_packet -> %d", rc);
76 free(packet.data);
77
78 return rc;
79}
80
81static int inet_link_check_new(void)
82{
83 bool already_known;
84 category_id_t iplink_cat;
85 service_id_t *svcs;
86 size_t count, i;
87 int rc;
88
89 fibril_mutex_lock(&inet_discovery_lock);
90
91 rc = loc_category_get_id("iplink", &iplink_cat, IPC_FLAG_BLOCKING);
92 if (rc != EOK) {
93 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed resolving category 'iplink'.");
94 fibril_mutex_unlock(&inet_discovery_lock);
95 return ENOENT;
96 }
97
98 rc = loc_category_get_svcs(iplink_cat, &svcs, &count);
99 if (rc != EOK) {
100 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed getting list of IP links.");
101 fibril_mutex_unlock(&inet_discovery_lock);
102 return EIO;
103 }
104
105 for (i = 0; i < count; i++) {
106 already_known = false;
107
108 list_foreach(inet_link_list, ilink_link) {
109 inet_link_t *ilink = list_get_instance(ilink_link,
110 inet_link_t, link_list);
111 if (ilink->svc_id == svcs[i]) {
112 already_known = true;
113 break;
114 }
115 }
116
117 if (!already_known) {
118 log_msg(LOG_DEFAULT, LVL_DEBUG, "Found IP link '%lu'",
119 (unsigned long) svcs[i]);
120 rc = inet_link_open(svcs[i]);
121 if (rc != EOK)
122 log_msg(LOG_DEFAULT, LVL_ERROR, "Could not open IP link.");
123 }
124 }
125
126 fibril_mutex_unlock(&inet_discovery_lock);
127 return EOK;
128}
129
130static inet_link_t *inet_link_new(void)
131{
132 inet_link_t *ilink = calloc(1, sizeof(inet_link_t));
133
134 if (ilink == NULL) {
135 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed allocating link structure. "
136 "Out of memory.");
137 return NULL;
138 }
139
140 link_initialize(&ilink->link_list);
141
142 return ilink;
143}
144
145static void inet_link_delete(inet_link_t *ilink)
146{
147 if (ilink->svc_name != NULL)
148 free(ilink->svc_name);
149 free(ilink);
150}
151
152static int inet_link_open(service_id_t sid)
153{
154 inet_link_t *ilink;
155 inet_addr_t iaddr;
156 int rc;
157
158 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_link_open()");
159 ilink = inet_link_new();
160 if (ilink == NULL)
161 return ENOMEM;
162
163 ilink->svc_id = sid;
164 ilink->iplink = NULL;
165
166 rc = loc_service_get_name(sid, &ilink->svc_name);
167 if (rc != EOK) {
168 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed getting service name.");
169 goto error;
170 }
171
172 ilink->sess = loc_service_connect(EXCHANGE_SERIALIZE, sid, 0);
173 if (ilink->sess == NULL) {
174 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed connecting '%s'", ilink->svc_name);
175 goto error;
176 }
177
178 rc = iplink_open(ilink->sess, &inet_iplink_ev_ops, &ilink->iplink);
179 if (rc != EOK) {
180 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed opening IP link '%s'",
181 ilink->svc_name);
182 goto error;
183 }
184
185 rc = iplink_get_mtu(ilink->iplink, &ilink->def_mtu);
186 if (rc != EOK) {
187 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed determinning MTU of link '%s'",
188 ilink->svc_name);
189 goto error;
190 }
191
192 log_msg(LOG_DEFAULT, LVL_DEBUG, "Opened IP link '%s'", ilink->svc_name);
193 list_append(&ilink->link_list, &inet_link_list);
194
195 inet_addrobj_t *addr;
196
197 static int first = 1;
198
199 addr = inet_addrobj_new();
200
201 if (first) {
202 inet_naddr(&addr->naddr, 127, 0, 0, 1, 24);
203 first = 0;
204 } else {
205 /* XXX For testing: set static IP address 10.0.2.15/24 */
206 inet_naddr(&addr->naddr, 10, 0, 2, 15, 24);
207 }
208
209 addr->ilink = ilink;
210 addr->name = str_dup("v4a");
211 rc = inet_addrobj_add(addr);
212 if (rc != EOK) {
213 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed setting IP address on internet link.");
214 inet_addrobj_delete(addr);
215 /* XXX Roll back */
216 return rc;
217 }
218
219 inet_naddr_addr(&addr->naddr, &iaddr);
220 rc = iplink_addr_add(ilink->iplink, &iaddr);
221 if (rc != EOK) {
222 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed setting IP address on internet link.");
223 inet_addrobj_remove(addr);
224 inet_addrobj_delete(addr);
225 /* XXX Roll back */
226 return rc;
227 }
228
229 return EOK;
230
231error:
232 if (ilink->iplink != NULL)
233 iplink_close(ilink->iplink);
234
235 inet_link_delete(ilink);
236 return rc;
237}
238
239static void inet_link_cat_change_cb(void)
240{
241 (void) inet_link_check_new();
242}
243
244int inet_link_discovery_start(void)
245{
246 int rc;
247
248 rc = loc_register_cat_change_cb(inet_link_cat_change_cb);
249 if (rc != EOK) {
250 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed registering callback for IP link "
251 "discovery (%d).", rc);
252 return rc;
253 }
254
255 return inet_link_check_new();
256}
257
258/** Send datagram over Internet link */
259int inet_link_send_dgram(inet_link_t *ilink, inet_addr_t *lsrc,
260 inet_addr_t *ldest, inet_dgram_t *dgram, uint8_t proto, uint8_t ttl, int df)
261{
262 /*
263 * Fill packet structure. Fragmentation is performed by
264 * inet_pdu_encode().
265 */
266
267 inet_packet_t packet;
268
269 packet.src = dgram->src;
270 packet.dest = dgram->dest;
271 packet.tos = dgram->tos;
272 packet.proto = proto;
273 packet.ttl = ttl;
274 packet.df = df;
275 packet.data = dgram->data;
276 packet.size = dgram->size;
277
278 iplink_sdu_t sdu;
279
280 int rc = inet_addr_pack(lsrc, &sdu.lsrc);
281 if (rc != EOK)
282 return rc;
283
284 rc = inet_addr_pack(ldest, &sdu.ldest);
285 if (rc != EOK)
286 return rc;
287
288 size_t offs = 0;
289 do {
290 size_t roffs;
291
292 /* Encode one fragment */
293 rc = inet_pdu_encode(&packet, offs, ilink->def_mtu, &sdu.data,
294 &sdu.size, &roffs);
295 if (rc != EOK)
296 return rc;
297
298 /* Send the PDU */
299 rc = iplink_send(ilink->iplink, &sdu);
300 free(sdu.data);
301
302 offs = roffs;
303 } while (offs < packet.size);
304
305 return rc;
306}
307
308inet_link_t *inet_link_get_by_id(sysarg_t link_id)
309{
310 fibril_mutex_lock(&inet_discovery_lock);
311
312 list_foreach(inet_link_list, elem) {
313 inet_link_t *ilink = list_get_instance(elem, inet_link_t,
314 link_list);
315
316 if (ilink->svc_id == link_id) {
317 fibril_mutex_unlock(&inet_discovery_lock);
318 return ilink;
319 }
320 }
321
322 fibril_mutex_unlock(&inet_discovery_lock);
323 return NULL;
324}
325
326/** @}
327 */
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