source: mainline/uspace/srv/net/inetsrv/inet_link.c@ 901b302

ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 901b302 was 3e6bca8, checked in by Jiri Svoboda <jiri@…>, 4 years ago

Represent Ethernet address as a number instead of an array

Carefully document the design since this breaks the principle of least
surprise. Also add unit tests.

  • Property mode set to 100644
File size: 11.9 KB
RevLine 
[e2e56e67]1/*
[f05edcb]2 * Copyright (c) 2021 Jiri Svoboda
[e2e56e67]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 <errno.h>
38#include <fibril_synch.h>
[b4edc96]39#include <inet/eth_addr.h>
[e2e56e67]40#include <inet/iplink.h>
41#include <io/log.h>
42#include <loc.h>
[b4edc96]43#include <stdbool.h>
[e2e56e67]44#include <stdlib.h>
[0e94b979]45#include <str.h>
[b4edc96]46#include <str_error.h>
[ceba4bed]47#include "addrobj.h"
[b4ec1ea]48#include "inetsrv.h"
[e2e56e67]49#include "inet_link.h"
[ceba4bed]50#include "pdu.h"
[e2e56e67]51
[3aece36]52static bool first_link = true;
53static bool first_link6 = true;
54
[313824a]55static FIBRIL_MUTEX_INITIALIZE(ip_ident_lock);
56static uint16_t ip_ident = 0;
57
[b7fd2a0]58static errno_t inet_iplink_recv(iplink_t *, iplink_recv_sdu_t *, ip_ver_t);
[b4edc96]59static errno_t inet_iplink_change_addr(iplink_t *, eth_addr_t *);
[b417559]60static inet_link_t *inet_link_get_by_id_locked(sysarg_t);
[e2e56e67]61
62static iplink_ev_ops_t inet_iplink_ev_ops = {
[c3b25985]63 .recv = inet_iplink_recv,
64 .change_addr = inet_iplink_change_addr,
[e2e56e67]65};
66
[7af0cc5]67static LIST_INITIALIZE(inet_links);
68static FIBRIL_MUTEX_INITIALIZE(inet_links_lock);
[e2e56e67]69
[3aece36]70static addr128_t link_local_node_ip =
[1433ecda]71 { 0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xfe, 0, 0, 0 };
[3aece36]72
[b4edc96]73static void inet_link_local_node_ip(eth_addr_t *mac_addr,
[3aece36]74 addr128_t ip_addr)
75{
[3e6bca8]76 uint8_t b[ETH_ADDR_SIZE];
[8d48c7e]77
[3e6bca8]78 memcpy(ip_addr, link_local_node_ip, 16);
79 eth_addr_encode(mac_addr, b);
80
81 ip_addr[8] = b[0] ^ 0x02;
82 ip_addr[9] = b[1];
83 ip_addr[10] = b[2];
84 ip_addr[13] = b[3];
85 ip_addr[14] = b[4];
86 ip_addr[15] = b[5];
[3aece36]87}
88
[b7fd2a0]89static errno_t inet_iplink_recv(iplink_t *iplink, iplink_recv_sdu_t *sdu, ip_ver_t ver)
[e2e56e67]90{
[a1a101d]91 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_iplink_recv()");
[8d48c7e]92
[b7fd2a0]93 errno_t rc;
[02a09ed]94 inet_packet_t packet;
[8d48c7e]95 inet_link_t *ilink;
96
97 ilink = (inet_link_t *)iplink_get_userptr(iplink);
98
[417a2ba1]99 switch (ver) {
100 case ip_v4:
[8d48c7e]101 rc = inet_pdu_decode(sdu->data, sdu->size, ilink->svc_id,
102 &packet);
[02a09ed]103 break;
[417a2ba1]104 case ip_v6:
[8d48c7e]105 rc = inet_pdu_decode6(sdu->data, sdu->size, ilink->svc_id,
106 &packet);
[1d24ad3]107 break;
[02a09ed]108 default:
[417a2ba1]109 log_msg(LOG_DEFAULT, LVL_DEBUG, "invalid IP version");
[02a09ed]110 return EINVAL;
111 }
[8d48c7e]112
[fe4310f]113 if (rc != EOK) {
[a1a101d]114 log_msg(LOG_DEFAULT, LVL_DEBUG, "failed decoding PDU");
[e767dbf]115 return rc;
[fe4310f]116 }
[8d48c7e]117
[ac415d50]118 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_iplink_recv: link_id=%zu", packet.link_id);
[a1a101d]119 log_msg(LOG_DEFAULT, LVL_DEBUG, "call inet_recv_packet()");
[fe4310f]120 rc = inet_recv_packet(&packet);
[c1694b6b]121 log_msg(LOG_DEFAULT, LVL_DEBUG, "call inet_recv_packet -> %s", str_error_name(rc));
[7f95c904]122 free(packet.data);
[8d48c7e]123
[fe4310f]124 return rc;
[e2e56e67]125}
126
[b4edc96]127static errno_t inet_iplink_change_addr(iplink_t *iplink, eth_addr_t *mac)
[c3b25985]128{
[3e6bca8]129 eth_addr_str_t saddr;
130
131 eth_addr_format(mac, &saddr);
[c3b25985]132 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_iplink_change_addr(): "
[3e6bca8]133 "new addr=%s", saddr.str);
[c3b25985]134
135 list_foreach(inet_links, link_list, inet_link_t, ilink) {
136 if (ilink->sess == iplink->sess)
[b4edc96]137 ilink->mac = *mac;
[c3b25985]138 }
139
140 return EOK;
141}
142
[e2e56e67]143static inet_link_t *inet_link_new(void)
144{
145 inet_link_t *ilink = calloc(1, sizeof(inet_link_t));
146
147 if (ilink == NULL) {
[a1a101d]148 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed allocating link structure. "
[e2e56e67]149 "Out of memory.");
150 return NULL;
151 }
152
153 link_initialize(&ilink->link_list);
154
155 return ilink;
156}
157
158static void inet_link_delete(inet_link_t *ilink)
159{
160 if (ilink->svc_name != NULL)
161 free(ilink->svc_name);
[a35b458]162
[e2e56e67]163 free(ilink);
164}
165
[b7fd2a0]166errno_t inet_link_open(service_id_t sid)
[e2e56e67]167{
168 inet_link_t *ilink;
[a2e3ee6]169 inet_addr_t iaddr;
[b7fd2a0]170 errno_t rc;
[e2e56e67]171
[a1a101d]172 log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_link_open()");
[e2e56e67]173 ilink = inet_link_new();
174 if (ilink == NULL)
175 return ENOMEM;
176
[45aa22c]177 ilink->svc_id = sid;
[347768d]178 ilink->iplink = NULL;
[45aa22c]179
[e2e56e67]180 rc = loc_service_get_name(sid, &ilink->svc_name);
181 if (rc != EOK) {
[a1a101d]182 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed getting service name.");
[e2e56e67]183 goto error;
184 }
185
[f9b2cb4c]186 ilink->sess = loc_service_connect(sid, INTERFACE_IPLINK, 0);
[e2e56e67]187 if (ilink->sess == NULL) {
[a1a101d]188 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed connecting '%s'", ilink->svc_name);
[e2e56e67]189 goto error;
190 }
191
[8d48c7e]192 rc = iplink_open(ilink->sess, &inet_iplink_ev_ops, ilink, &ilink->iplink);
[e2e56e67]193 if (rc != EOK) {
[a1a101d]194 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed opening IP link '%s'",
[e2e56e67]195 ilink->svc_name);
196 goto error;
197 }
198
[347768d]199 rc = iplink_get_mtu(ilink->iplink, &ilink->def_mtu);
200 if (rc != EOK) {
[a1a101d]201 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed determinning MTU of link '%s'",
[347768d]202 ilink->svc_name);
203 goto error;
204 }
[a35b458]205
[a17356fd]206 /*
207 * Get the MAC address of the link. If the link has a MAC
208 * address, we assume that it supports NDP.
209 */
210 rc = iplink_get_mac48(ilink->iplink, &ilink->mac);
211 ilink->mac_valid = (rc == EOK);
[347768d]212
[a1a101d]213 log_msg(LOG_DEFAULT, LVL_DEBUG, "Opened IP link '%s'", ilink->svc_name);
[b417559]214
215 fibril_mutex_lock(&inet_links_lock);
216
217 if (inet_link_get_by_id_locked(sid) != NULL) {
218 fibril_mutex_unlock(&inet_links_lock);
219 log_msg(LOG_DEFAULT, LVL_DEBUG, "Link %zu already open",
220 sid);
221 rc = EEXIST;
222 goto error;
223 }
224
[7af0cc5]225 list_append(&ilink->link_list, &inet_links);
[b417559]226 fibril_mutex_unlock(&inet_links_lock);
[e2e56e67]227
[3aece36]228 inet_addrobj_t *addr = NULL;
[a35b458]229
[695b6ff]230 /* XXX FIXME Cannot rely on loopback being the first IP link service!! */
[3aece36]231 if (first_link) {
232 addr = inet_addrobj_new();
[a35b458]233
[a2e3ee6]234 inet_naddr(&addr->naddr, 127, 0, 0, 1, 24);
[3aece36]235 first_link = false;
[081971b]236 }
[a35b458]237
[3aece36]238 if (addr != NULL) {
239 addr->ilink = ilink;
240 addr->name = str_dup("v4a");
[a35b458]241
[3aece36]242 rc = inet_addrobj_add(addr);
243 if (rc == EOK) {
244 inet_naddr_addr(&addr->naddr, &iaddr);
245 rc = iplink_addr_add(ilink->iplink, &iaddr);
246 if (rc != EOK) {
247 log_msg(LOG_DEFAULT, LVL_ERROR,
248 "Failed setting IPv4 address on internet link.");
249 inet_addrobj_remove(addr);
250 inet_addrobj_delete(addr);
251 }
252 } else {
253 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed adding IPv4 address.");
254 inet_addrobj_delete(addr);
255 }
[bf9e6fc]256 }
[a35b458]257
[3aece36]258 inet_addrobj_t *addr6 = NULL;
[a35b458]259
[3aece36]260 if (first_link6) {
261 addr6 = inet_addrobj_new();
[a35b458]262
[3aece36]263 inet_naddr6(&addr6->naddr, 0, 0, 0, 0, 0, 0, 0, 1, 128);
264 first_link6 = false;
265 } else if (ilink->mac_valid) {
266 addr6 = inet_addrobj_new();
[a35b458]267
[3aece36]268 addr128_t link_local;
[f05edcb]269 inet_link_local_node_ip(&ilink->mac, link_local);
[a35b458]270
[3aece36]271 inet_naddr_set6(link_local, 64, &addr6->naddr);
[962f03b]272 }
[a35b458]273
[3aece36]274 if (addr6 != NULL) {
275 addr6->ilink = ilink;
276 addr6->name = str_dup("v6a");
[a35b458]277
[3aece36]278 rc = inet_addrobj_add(addr6);
279 if (rc == EOK) {
280 inet_naddr_addr(&addr6->naddr, &iaddr);
281 rc = iplink_addr_add(ilink->iplink, &iaddr);
282 if (rc != EOK) {
283 log_msg(LOG_DEFAULT, LVL_ERROR,
284 "Failed setting IPv6 address on internet link.");
285 inet_addrobj_remove(addr6);
286 inet_addrobj_delete(addr6);
287 }
288 } else {
289 log_msg(LOG_DEFAULT, LVL_ERROR, "Failed adding IPv6 address.");
290 inet_addrobj_delete(addr6);
291 }
[1d24ad3]292 }
[a35b458]293
[bd88bee]294 log_msg(LOG_DEFAULT, LVL_DEBUG, "Configured link '%s'.", ilink->svc_name);
[e2e56e67]295 return EOK;
[a35b458]296
[e2e56e67]297error:
[347768d]298 if (ilink->iplink != NULL)
299 iplink_close(ilink->iplink);
[a35b458]300
[e2e56e67]301 inet_link_delete(ilink);
302 return rc;
303}
304
[1f97352]305/** Send IPv4 datagram over Internet link
306 *
307 * @param ilink Internet link
308 * @param lsrc Source IPv4 address
309 * @param ldest Destination IPv4 address
310 * @param dgram IPv4 datagram body
311 * @param proto Protocol
312 * @param ttl Time-to-live
313 * @param df Do-not-Fragment flag
314 *
315 * @return EOK on success
316 * @return ENOMEM when not enough memory to create the datagram
317 * @return ENOTSUP if networking mode is not supported
318 *
319 */
[b7fd2a0]320errno_t inet_link_send_dgram(inet_link_t *ilink, addr32_t lsrc, addr32_t ldest,
[a17356fd]321 inet_dgram_t *dgram, uint8_t proto, uint8_t ttl, int df)
[ceba4bed]322{
[a17356fd]323 addr32_t src_v4;
[f023251]324 ip_ver_t src_ver = inet_addr_get(&dgram->src, &src_v4, NULL);
325 if (src_ver != ip_v4)
[a17356fd]326 return EINVAL;
[a35b458]327
[a17356fd]328 addr32_t dest_v4;
[f023251]329 ip_ver_t dest_ver = inet_addr_get(&dgram->dest, &dest_v4, NULL);
330 if (dest_ver != ip_v4)
[a17356fd]331 return EINVAL;
[a35b458]332
[347768d]333 /*
334 * Fill packet structure. Fragmentation is performed by
335 * inet_pdu_encode().
336 */
[a35b458]337
[a17356fd]338 iplink_sdu_t sdu;
[a35b458]339
[a17356fd]340 sdu.src = lsrc;
341 sdu.dest = ldest;
[a35b458]342
[a2e3ee6]343 inet_packet_t packet;
[a35b458]344
[fe4310f]345 packet.src = dgram->src;
346 packet.dest = dgram->dest;
347 packet.tos = dgram->tos;
[2ff150e]348 packet.proto = proto;
[fe4310f]349 packet.ttl = ttl;
[a35b458]350
[313824a]351 /* Allocate identifier */
352 fibril_mutex_lock(&ip_ident_lock);
353 packet.ident = ++ip_ident;
354 fibril_mutex_unlock(&ip_ident_lock);
[a35b458]355
[fe4310f]356 packet.df = df;
357 packet.data = dgram->data;
358 packet.size = dgram->size;
[a35b458]359
[b7fd2a0]360 errno_t rc;
[313824a]361 size_t offs = 0;
[a35b458]362
[347768d]363 do {
364 /* Encode one fragment */
[a35b458]365
[02a09ed]366 size_t roffs;
[a17356fd]367 rc = inet_pdu_encode(&packet, src_v4, dest_v4, offs, ilink->def_mtu,
368 &sdu.data, &sdu.size, &roffs);
[347768d]369 if (rc != EOK)
370 return rc;
[a35b458]371
[347768d]372 /* Send the PDU */
373 rc = iplink_send(ilink->iplink, &sdu);
[a35b458]374
[347768d]375 free(sdu.data);
[a17356fd]376 offs = roffs;
377 } while (offs < packet.size);
[a35b458]378
[a17356fd]379 return rc;
380}
381
[1f97352]382/** Send IPv6 datagram over Internet link
383 *
384 * @param ilink Internet link
385 * @param ldest Destination MAC address
386 * @param dgram IPv6 datagram body
387 * @param proto Next header
388 * @param ttl Hop limit
389 * @param df Do-not-Fragment flag (unused)
390 *
391 * @return EOK on success
392 * @return ENOMEM when not enough memory to create the datagram
393 *
394 */
[b4edc96]395errno_t inet_link_send_dgram6(inet_link_t *ilink, eth_addr_t *ldest,
[a17356fd]396 inet_dgram_t *dgram, uint8_t proto, uint8_t ttl, int df)
397{
398 addr128_t src_v6;
[f023251]399 ip_ver_t src_ver = inet_addr_get(&dgram->src, NULL, &src_v6);
400 if (src_ver != ip_v6)
[a17356fd]401 return EINVAL;
[a35b458]402
[a17356fd]403 addr128_t dest_v6;
[f023251]404 ip_ver_t dest_ver = inet_addr_get(&dgram->dest, NULL, &dest_v6);
405 if (dest_ver != ip_v6)
[a17356fd]406 return EINVAL;
[a35b458]407
[a17356fd]408 iplink_sdu6_t sdu6;
[d5ed54b]409 sdu6.dest = *ldest;
[a35b458]410
[a17356fd]411 /*
412 * Fill packet structure. Fragmentation is performed by
413 * inet_pdu_encode6().
414 */
[a35b458]415
[a17356fd]416 inet_packet_t packet;
[a35b458]417
[a17356fd]418 packet.src = dgram->src;
419 packet.dest = dgram->dest;
420 packet.tos = dgram->tos;
421 packet.proto = proto;
422 packet.ttl = ttl;
[a35b458]423
[313824a]424 /* Allocate identifier */
425 fibril_mutex_lock(&ip_ident_lock);
426 packet.ident = ++ip_ident;
427 fibril_mutex_unlock(&ip_ident_lock);
[a35b458]428
[a17356fd]429 packet.df = df;
430 packet.data = dgram->data;
431 packet.size = dgram->size;
[a35b458]432
[b7fd2a0]433 errno_t rc;
[a17356fd]434 size_t offs = 0;
[a35b458]435
[a17356fd]436 do {
437 /* Encode one fragment */
[a35b458]438
[a17356fd]439 size_t roffs;
440 rc = inet_pdu_encode6(&packet, src_v6, dest_v6, offs, ilink->def_mtu,
441 &sdu6.data, &sdu6.size, &roffs);
442 if (rc != EOK)
443 return rc;
[a35b458]444
[a17356fd]445 /* Send the PDU */
446 rc = iplink_send6(ilink->iplink, &sdu6);
[a35b458]447
[a17356fd]448 free(sdu6.data);
[347768d]449 offs = roffs;
450 } while (offs < packet.size);
[a35b458]451
[ceba4bed]452 return rc;
453}
454
[b417559]455static inet_link_t *inet_link_get_by_id_locked(sysarg_t link_id)
[45aa22c]456{
[b417559]457 assert(fibril_mutex_is_locked(&inet_links_lock));
[45aa22c]458
[7af0cc5]459 list_foreach(inet_links, link_list, inet_link_t, ilink) {
[b417559]460 if (ilink->svc_id == link_id)
[45aa22c]461 return ilink;
462 }
463
464 return NULL;
465}
[ceba4bed]466
[b417559]467inet_link_t *inet_link_get_by_id(sysarg_t link_id)
468{
469 inet_link_t *ilink;
470
471 fibril_mutex_lock(&inet_links_lock);
472 ilink = inet_link_get_by_id_locked(link_id);
473 fibril_mutex_unlock(&inet_links_lock);
474
475 return ilink;
476}
477
[b8b1adb1]478/** Get IDs of all links. */
[b7fd2a0]479errno_t inet_link_get_id_list(sysarg_t **rid_list, size_t *rcount)
[b8b1adb1]480{
481 sysarg_t *id_list;
482 size_t count, i;
483
[7af0cc5]484 fibril_mutex_lock(&inet_links_lock);
485 count = list_count(&inet_links);
[b8b1adb1]486
487 id_list = calloc(count, sizeof(sysarg_t));
488 if (id_list == NULL) {
[7af0cc5]489 fibril_mutex_unlock(&inet_links_lock);
[b8b1adb1]490 return ENOMEM;
491 }
492
493 i = 0;
[7af0cc5]494 list_foreach(inet_links, link_list, inet_link_t, ilink) {
[b8b1adb1]495 id_list[i++] = ilink->svc_id;
496 }
497
[7af0cc5]498 fibril_mutex_unlock(&inet_links_lock);
[b8b1adb1]499
500 *rid_list = id_list;
501 *rcount = count;
502
503 return EOK;
504}
505
[e2e56e67]506/** @}
507 */
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