source: mainline/uspace/srv/net/inetsrv/inet_link.c@ 44c9ef4

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 44c9ef4 was 1f97352, checked in by Martin Decky <martin@…>, 12 years ago

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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#include <net/socket_codes.h>
46#include "addrobj.h"
47#include "inetsrv.h"
48#include "inet_link.h"
49#include "pdu.h"
50
51static bool first_link = true;
52static bool first_link6 = true;
53
54static FIBRIL_MUTEX_INITIALIZE(ip_ident_lock);
55static uint16_t ip_ident = 0;
56
57static int inet_link_open(service_id_t);
58static int inet_iplink_recv(iplink_t *, iplink_recv_sdu_t *, uint16_t);
59
60static iplink_ev_ops_t inet_iplink_ev_ops = {
61 .recv = inet_iplink_recv
62};
63
64static LIST_INITIALIZE(inet_link_list);
65static FIBRIL_MUTEX_INITIALIZE(inet_discovery_lock);
66
67static addr128_t link_local_node_ip =
68 {0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xfe, 0, 0, 0};
69
70static void inet_link_local_node_ip(addr48_t mac_addr,
71 addr128_t ip_addr)
72{
73 memcpy(ip_addr, link_local_node_ip, 16);
74
75 ip_addr[8] = mac_addr[0] ^ 0x02;
76 ip_addr[9] = mac_addr[1];
77 ip_addr[10] = mac_addr[2];
78 ip_addr[13] = mac_addr[3];
79 ip_addr[14] = mac_addr[4];
80 ip_addr[15] = mac_addr[5];
81}
82
83static int inet_iplink_recv(iplink_t *iplink, iplink_recv_sdu_t *sdu, uint16_t af)
84{
85 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_iplink_recv()");
86
87 int rc;
88 inet_packet_t packet;
89
90 switch (af) {
91 case AF_INET:
92 rc = inet_pdu_decode(sdu->data, sdu->size, &packet);
93 break;
94 case AF_INET6:
95 rc = inet_pdu_decode6(sdu->data, sdu->size, &packet);
96 break;
97 default:
98 log_msg(LOG_DEFAULT, LVL_DEBUG, "invalid address family");
99 return EINVAL;
100 }
101
102 if (rc != EOK) {
103 log_msg(LOG_DEFAULT, LVL_DEBUG, "failed decoding PDU");
104 return rc;
105 }
106
107 log_msg(LOG_DEFAULT, LVL_DEBUG, "call inet_recv_packet()");
108 rc = inet_recv_packet(&packet);
109 log_msg(LOG_DEFAULT, LVL_DEBUG, "call inet_recv_packet -> %d", rc);
110 free(packet.data);
111
112 return rc;
113}
114
115static int inet_link_check_new(void)
116{
117 bool already_known;
118 category_id_t iplink_cat;
119 service_id_t *svcs;
120 size_t count, i;
121 int rc;
122
123 fibril_mutex_lock(&inet_discovery_lock);
124
125 rc = loc_category_get_id("iplink", &iplink_cat, IPC_FLAG_BLOCKING);
126 if (rc != EOK) {
127 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed resolving category 'iplink'.");
128 fibril_mutex_unlock(&inet_discovery_lock);
129 return ENOENT;
130 }
131
132 rc = loc_category_get_svcs(iplink_cat, &svcs, &count);
133 if (rc != EOK) {
134 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed getting list of IP links.");
135 fibril_mutex_unlock(&inet_discovery_lock);
136 return EIO;
137 }
138
139 for (i = 0; i < count; i++) {
140 already_known = false;
141
142 list_foreach(inet_link_list, ilink_link) {
143 inet_link_t *ilink = list_get_instance(ilink_link,
144 inet_link_t, link_list);
145 if (ilink->svc_id == svcs[i]) {
146 already_known = true;
147 break;
148 }
149 }
150
151 if (!already_known) {
152 log_msg(LOG_DEFAULT, LVL_DEBUG, "Found IP link '%lu'",
153 (unsigned long) svcs[i]);
154 rc = inet_link_open(svcs[i]);
155 if (rc != EOK)
156 log_msg(LOG_DEFAULT, LVL_ERROR, "Could not open IP link.");
157 }
158 }
159
160 fibril_mutex_unlock(&inet_discovery_lock);
161 return EOK;
162}
163
164static inet_link_t *inet_link_new(void)
165{
166 inet_link_t *ilink = calloc(1, sizeof(inet_link_t));
167
168 if (ilink == NULL) {
169 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed allocating link structure. "
170 "Out of memory.");
171 return NULL;
172 }
173
174 link_initialize(&ilink->link_list);
175
176 return ilink;
177}
178
179static void inet_link_delete(inet_link_t *ilink)
180{
181 if (ilink->svc_name != NULL)
182 free(ilink->svc_name);
183
184 free(ilink);
185}
186
187static int inet_link_open(service_id_t sid)
188{
189 inet_link_t *ilink;
190 inet_addr_t iaddr;
191 int rc;
192
193 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_link_open()");
194 ilink = inet_link_new();
195 if (ilink == NULL)
196 return ENOMEM;
197
198 ilink->svc_id = sid;
199 ilink->iplink = NULL;
200
201 rc = loc_service_get_name(sid, &ilink->svc_name);
202 if (rc != EOK) {
203 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed getting service name.");
204 goto error;
205 }
206
207 ilink->sess = loc_service_connect(EXCHANGE_SERIALIZE, sid, 0);
208 if (ilink->sess == NULL) {
209 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed connecting '%s'", ilink->svc_name);
210 goto error;
211 }
212
213 rc = iplink_open(ilink->sess, &inet_iplink_ev_ops, &ilink->iplink);
214 if (rc != EOK) {
215 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed opening IP link '%s'",
216 ilink->svc_name);
217 goto error;
218 }
219
220 rc = iplink_get_mtu(ilink->iplink, &ilink->def_mtu);
221 if (rc != EOK) {
222 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed determinning MTU of link '%s'",
223 ilink->svc_name);
224 goto error;
225 }
226
227 /*
228 * Get the MAC address of the link. If the link has a MAC
229 * address, we assume that it supports NDP.
230 */
231 rc = iplink_get_mac48(ilink->iplink, &ilink->mac);
232 ilink->mac_valid = (rc == EOK);
233
234 log_msg(LOG_DEFAULT, LVL_DEBUG, "Opened IP link '%s'", ilink->svc_name);
235 list_append(&ilink->link_list, &inet_link_list);
236
237 inet_addrobj_t *addr = NULL;
238
239 if (first_link) {
240 addr = inet_addrobj_new();
241
242 inet_naddr(&addr->naddr, 127, 0, 0, 1, 24);
243 first_link = false;
244 } else {
245 /*
246 * FIXME
247 * Setting static IPv4 address for testing purposes:
248 * 10.0.2.15/24
249 */
250 addr = inet_addrobj_new();
251
252 inet_naddr(&addr->naddr, 10, 0, 2, 15, 24);
253 }
254
255 if (addr != NULL) {
256 addr->ilink = ilink;
257 addr->name = str_dup("v4a");
258
259 rc = inet_addrobj_add(addr);
260 if (rc == EOK) {
261 inet_naddr_addr(&addr->naddr, &iaddr);
262 rc = iplink_addr_add(ilink->iplink, &iaddr);
263 if (rc != EOK) {
264 log_msg(LOG_DEFAULT, LVL_ERROR,
265 "Failed setting IPv4 address on internet link.");
266 inet_addrobj_remove(addr);
267 inet_addrobj_delete(addr);
268 }
269 } else {
270 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed adding IPv4 address.");
271 inet_addrobj_delete(addr);
272 }
273 }
274
275 inet_addrobj_t *addr6 = NULL;
276
277 if (first_link6) {
278 addr6 = inet_addrobj_new();
279
280 inet_naddr6(&addr6->naddr, 0, 0, 0, 0, 0, 0, 0, 1, 128);
281 first_link6 = false;
282 } else if (ilink->mac_valid) {
283 addr6 = inet_addrobj_new();
284
285 addr128_t link_local;
286 inet_link_local_node_ip(ilink->mac, link_local);
287
288 inet_naddr_set6(link_local, 64, &addr6->naddr);
289 }
290
291 if (addr6 != NULL) {
292 addr6->ilink = ilink;
293 addr6->name = str_dup("v6a");
294
295 rc = inet_addrobj_add(addr6);
296 if (rc == EOK) {
297 inet_naddr_addr(&addr6->naddr, &iaddr);
298 rc = iplink_addr_add(ilink->iplink, &iaddr);
299 if (rc != EOK) {
300 log_msg(LOG_DEFAULT, LVL_ERROR,
301 "Failed setting IPv6 address on internet link.");
302 inet_addrobj_remove(addr6);
303 inet_addrobj_delete(addr6);
304 }
305 } else {
306 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed adding IPv6 address.");
307 inet_addrobj_delete(addr6);
308 }
309 }
310
311 return EOK;
312
313error:
314 if (ilink->iplink != NULL)
315 iplink_close(ilink->iplink);
316
317 inet_link_delete(ilink);
318 return rc;
319}
320
321static void inet_link_cat_change_cb(void)
322{
323 (void) inet_link_check_new();
324}
325
326int inet_link_discovery_start(void)
327{
328 int rc;
329
330 rc = loc_register_cat_change_cb(inet_link_cat_change_cb);
331 if (rc != EOK) {
332 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed registering callback for IP link "
333 "discovery (%d).", rc);
334 return rc;
335 }
336
337 return inet_link_check_new();
338}
339
340/** Send IPv4 datagram over Internet link
341 *
342 * @param ilink Internet link
343 * @param lsrc Source IPv4 address
344 * @param ldest Destination IPv4 address
345 * @param dgram IPv4 datagram body
346 * @param proto Protocol
347 * @param ttl Time-to-live
348 * @param df Do-not-Fragment flag
349 *
350 * @return EOK on success
351 * @return ENOMEM when not enough memory to create the datagram
352 * @return ENOTSUP if networking mode is not supported
353 *
354 */
355int inet_link_send_dgram(inet_link_t *ilink, addr32_t lsrc, addr32_t ldest,
356 inet_dgram_t *dgram, uint8_t proto, uint8_t ttl, int df)
357{
358 addr32_t src_v4;
359 uint16_t src_af = inet_addr_get(&dgram->src, &src_v4, NULL);
360 if (src_af != AF_INET)
361 return EINVAL;
362
363 addr32_t dest_v4;
364 uint16_t dest_af = inet_addr_get(&dgram->dest, &dest_v4, NULL);
365 if (dest_af != AF_INET)
366 return EINVAL;
367
368 /*
369 * Fill packet structure. Fragmentation is performed by
370 * inet_pdu_encode().
371 */
372
373 iplink_sdu_t sdu;
374
375 sdu.src = lsrc;
376 sdu.dest = ldest;
377
378 inet_packet_t packet;
379
380 packet.src = dgram->src;
381 packet.dest = dgram->dest;
382 packet.tos = dgram->tos;
383 packet.proto = proto;
384 packet.ttl = ttl;
385
386 /* Allocate identifier */
387 fibril_mutex_lock(&ip_ident_lock);
388 packet.ident = ++ip_ident;
389 fibril_mutex_unlock(&ip_ident_lock);
390
391 packet.df = df;
392 packet.data = dgram->data;
393 packet.size = dgram->size;
394
395 int rc;
396 size_t offs = 0;
397
398 do {
399 /* Encode one fragment */
400
401 size_t roffs;
402 rc = inet_pdu_encode(&packet, src_v4, dest_v4, offs, ilink->def_mtu,
403 &sdu.data, &sdu.size, &roffs);
404 if (rc != EOK)
405 return rc;
406
407 /* Send the PDU */
408 rc = iplink_send(ilink->iplink, &sdu);
409
410 free(sdu.data);
411 offs = roffs;
412 } while (offs < packet.size);
413
414 return rc;
415}
416
417/** Send IPv6 datagram over Internet link
418 *
419 * @param ilink Internet link
420 * @param ldest Destination MAC address
421 * @param dgram IPv6 datagram body
422 * @param proto Next header
423 * @param ttl Hop limit
424 * @param df Do-not-Fragment flag (unused)
425 *
426 * @return EOK on success
427 * @return ENOMEM when not enough memory to create the datagram
428 *
429 */
430int inet_link_send_dgram6(inet_link_t *ilink, addr48_t ldest,
431 inet_dgram_t *dgram, uint8_t proto, uint8_t ttl, int df)
432{
433 addr128_t src_v6;
434 uint16_t src_af = inet_addr_get(&dgram->src, NULL, &src_v6);
435 if (src_af != AF_INET6)
436 return EINVAL;
437
438 addr128_t dest_v6;
439 uint16_t dest_af = inet_addr_get(&dgram->dest, NULL, &dest_v6);
440 if (dest_af != AF_INET6)
441 return EINVAL;
442
443 iplink_sdu6_t sdu6;
444 addr48(ldest, sdu6.dest);
445
446 /*
447 * Fill packet structure. Fragmentation is performed by
448 * inet_pdu_encode6().
449 */
450
451 inet_packet_t packet;
452
453 packet.src = dgram->src;
454 packet.dest = dgram->dest;
455 packet.tos = dgram->tos;
456 packet.proto = proto;
457 packet.ttl = ttl;
458
459 /* Allocate identifier */
460 fibril_mutex_lock(&ip_ident_lock);
461 packet.ident = ++ip_ident;
462 fibril_mutex_unlock(&ip_ident_lock);
463
464 packet.df = df;
465 packet.data = dgram->data;
466 packet.size = dgram->size;
467
468 int rc;
469 size_t offs = 0;
470
471 do {
472 /* Encode one fragment */
473
474 size_t roffs;
475 rc = inet_pdu_encode6(&packet, src_v6, dest_v6, offs, ilink->def_mtu,
476 &sdu6.data, &sdu6.size, &roffs);
477 if (rc != EOK)
478 return rc;
479
480 /* Send the PDU */
481 rc = iplink_send6(ilink->iplink, &sdu6);
482
483 free(sdu6.data);
484 offs = roffs;
485 } while (offs < packet.size);
486
487 return rc;
488}
489
490inet_link_t *inet_link_get_by_id(sysarg_t link_id)
491{
492 fibril_mutex_lock(&inet_discovery_lock);
493
494 list_foreach(inet_link_list, elem) {
495 inet_link_t *ilink = list_get_instance(elem, inet_link_t,
496 link_list);
497
498 if (ilink->svc_id == link_id) {
499 fibril_mutex_unlock(&inet_discovery_lock);
500 return ilink;
501 }
502 }
503
504 fibril_mutex_unlock(&inet_discovery_lock);
505 return NULL;
506}
507
508/** @}
509 */
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