source: mainline/uspace/srv/inet/inet_link.c@ 347768d

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 347768d was 347768d, checked in by Jiri Svoboda <jiri@…>, 14 years ago

Fragmentation of outgoing datagrams, default link MTU.
  • Property mode set to 100644
File size: 7.3 KB
Line 
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 <bool.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 "inet.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(LVL_DEBUG, "inet_iplink_recv()");
67 rc = inet_pdu_decode(sdu->data, sdu->size, &packet);
68 if (rc != EOK) {
69 log_msg(LVL_DEBUG, "failed decoding PDU");
70 return rc;
71 }
72
73 log_msg(LVL_DEBUG, "call inet_recv_packet()");
74 rc = inet_recv_packet(&packet);
75 log_msg(LVL_DEBUG, "call inet_recv_packet -> %d", rc);
76
77 return rc;
78}
79
80static int inet_link_check_new(void)
81{
82 bool already_known;
83 category_id_t iplink_cat;
84 service_id_t *svcs;
85 size_t count, i;
86 int rc;
87
88 fibril_mutex_lock(&inet_discovery_lock);
89
90 rc = loc_category_get_id("iplink", &iplink_cat, IPC_FLAG_BLOCKING);
91 if (rc != EOK) {
92 log_msg(LVL_ERROR, "Failed resolving category 'iplink'.");
93 fibril_mutex_unlock(&inet_discovery_lock);
94 return ENOENT;
95 }
96
97 rc = loc_category_get_svcs(iplink_cat, &svcs, &count);
98 if (rc != EOK) {
99 log_msg(LVL_ERROR, "Failed getting list of IP links.");
100 fibril_mutex_unlock(&inet_discovery_lock);
101 return EIO;
102 }
103
104 for (i = 0; i < count; i++) {
105 already_known = false;
106
107 list_foreach(inet_link_list, ilink_link) {
108 inet_link_t *ilink = list_get_instance(ilink_link,
109 inet_link_t, link_list);
110 if (ilink->svc_id == svcs[i]) {
111 already_known = true;
112 break;
113 }
114 }
115
116 if (!already_known) {
117 log_msg(LVL_DEBUG, "Found IP link '%lu'",
118 (unsigned long) svcs[i]);
119 rc = inet_link_open(svcs[i]);
120 if (rc != EOK)
121 log_msg(LVL_ERROR, "Could not open IP link.");
122 }
123 }
124
125 fibril_mutex_unlock(&inet_discovery_lock);
126 return EOK;
127}
128
129static inet_link_t *inet_link_new(void)
130{
131 inet_link_t *ilink = calloc(1, sizeof(inet_link_t));
132
133 if (ilink == NULL) {
134 log_msg(LVL_ERROR, "Failed allocating link structure. "
135 "Out of memory.");
136 return NULL;
137 }
138
139 link_initialize(&ilink->link_list);
140
141 return ilink;
142}
143
144static void inet_link_delete(inet_link_t *ilink)
145{
146 if (ilink->svc_name != NULL)
147 free(ilink->svc_name);
148 free(ilink);
149}
150
151static int inet_link_open(service_id_t sid)
152{
153 inet_link_t *ilink;
154 iplink_addr_t iaddr;
155 int rc;
156
157 log_msg(LVL_DEBUG, "inet_link_open()");
158 ilink = inet_link_new();
159 if (ilink == NULL)
160 return ENOMEM;
161
162 ilink->svc_id = sid;
163 ilink->iplink = NULL;
164
165 rc = loc_service_get_name(sid, &ilink->svc_name);
166 if (rc != EOK) {
167 log_msg(LVL_ERROR, "Failed getting service name.");
168 goto error;
169 }
170
171 ilink->sess = loc_service_connect(EXCHANGE_SERIALIZE, sid, 0);
172 if (ilink->sess == NULL) {
173 log_msg(LVL_ERROR, "Failed connecting '%s'", ilink->svc_name);
174 goto error;
175 }
176
177 rc = iplink_open(ilink->sess, &inet_iplink_ev_ops, &ilink->iplink);
178 if (rc != EOK) {
179 log_msg(LVL_ERROR, "Failed opening IP link '%s'",
180 ilink->svc_name);
181 goto error;
182 }
183
184 rc = iplink_get_mtu(ilink->iplink, &ilink->def_mtu);
185 if (rc != EOK) {
186 log_msg(LVL_ERROR, "Failed determinning MTU of link '%s'",
187 ilink->svc_name);
188 goto error;
189 }
190
191 log_msg(LVL_DEBUG, "Opened IP link '%s'", ilink->svc_name);
192 list_append(&ilink->link_list, &inet_link_list);
193
194 inet_addrobj_t *addr;
195
196 static int first = 1;
197 /* XXX For testing: set static IP address 192.168.0.4/24 */
198 addr = inet_addrobj_new();
199 if (first) {
200 addr->naddr.ipv4 = (127 << 24) + (0 << 16) + (0 << 8) + 1;
201 first = 0;
202 } else {
203 addr->naddr.ipv4 = (192 << 24) + (168 << 16) + (0 << 8) + 4;
204 }
205 addr->naddr.bits = 24;
206 addr->ilink = ilink;
207 addr->name = str_dup("v4a");
208 inet_addrobj_add(addr);
209
210 iaddr.ipv4 = addr->naddr.ipv4;
211 rc = iplink_addr_add(ilink->iplink, &iaddr);
212 if (rc != EOK) {
213 log_msg(LVL_ERROR, "Failed setting IP address on internet link.");
214 /* XXX Roll back */
215 return rc;
216 }
217
218 return EOK;
219
220error:
221 if (ilink->iplink != NULL)
222 iplink_close(ilink->iplink);
223 inet_link_delete(ilink);
224 return rc;
225}
226
227static void inet_link_cat_change_cb(void)
228{
229 (void) inet_link_check_new();
230}
231
232int inet_link_discovery_start(void)
233{
234 int rc;
235
236 rc = loc_register_cat_change_cb(inet_link_cat_change_cb);
237 if (rc != EOK) {
238 log_msg(LVL_ERROR, "Failed registering callback for IP link "
239 "discovery (%d).", rc);
240 return rc;
241 }
242
243 return inet_link_check_new();
244}
245
246/** Send datagram over Internet link */
247int inet_link_send_dgram(inet_link_t *ilink, inet_addr_t *lsrc,
248 inet_addr_t *ldest, inet_dgram_t *dgram, uint8_t proto, uint8_t ttl, int df)
249{
250 iplink_sdu_t sdu;
251 inet_packet_t packet;
252 int rc;
253 size_t offs, roffs;
254
255 /*
256 * Fill packet structure. Fragmentation is performed by
257 * inet_pdu_encode().
258 */
259 packet.src = dgram->src;
260 packet.dest = dgram->dest;
261 packet.tos = dgram->tos;
262 packet.proto = proto;
263 packet.ttl = ttl;
264 packet.df = df;
265 packet.data = dgram->data;
266 packet.size = dgram->size;
267
268 sdu.lsrc.ipv4 = lsrc->ipv4;
269 sdu.ldest.ipv4 = ldest->ipv4;
270
271 offs = 0;
272 do {
273 /* Encode one fragment */
274 rc = inet_pdu_encode(&packet, offs, ilink->def_mtu, &sdu.data,
275 &sdu.size, &roffs);
276 if (rc != EOK)
277 return rc;
278
279 /* Send the PDU */
280 rc = iplink_send(ilink->iplink, &sdu);
281 free(sdu.data);
282
283 offs = roffs;
284 } while (offs < packet.size);
285
286 return rc;
287}
288
289inet_link_t *inet_link_get_by_id(sysarg_t link_id)
290{
291 fibril_mutex_lock(&inet_discovery_lock);
292
293 list_foreach(inet_link_list, elem) {
294 inet_link_t *ilink = list_get_instance(elem, inet_link_t,
295 link_list);
296
297 if (ilink->svc_id == link_id) {
298 fibril_mutex_unlock(&inet_discovery_lock);
299 return ilink;
300 }
301 }
302
303 fibril_mutex_unlock(&inet_discovery_lock);
304 return NULL;
305}
306
307/** @}
308 */
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