2002-02-18 16:25:19 +00:00
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/*
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net_packet.c -- Handles in- and outgoing VPN packets
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2004-03-21 14:21:22 +00:00
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Copyright (C) 1998-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
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2000-2004 Guus Sliepen <guus@tinc-vpn.org>
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2002-02-18 16:25:19 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2004-03-21 14:21:22 +00:00
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$Id$
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2002-02-18 16:25:19 +00:00
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*/
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2003-07-17 15:06:27 +00:00
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#include "system.h"
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2002-02-18 16:25:19 +00:00
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#include <openssl/rand.h>
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2003-10-11 12:16:13 +00:00
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#include <openssl/err.h>
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2002-02-18 16:25:19 +00:00
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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#include <openssl/hmac.h>
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#include <zlib.h>
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2003-05-06 21:13:18 +00:00
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#include <lzo1x.h>
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2002-02-18 16:25:19 +00:00
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2003-07-17 15:06:27 +00:00
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#include "avl_tree.h"
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2002-02-18 16:25:19 +00:00
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#include "conf.h"
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#include "connection.h"
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2003-07-17 15:06:27 +00:00
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#include "device.h"
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2003-12-27 16:32:52 +00:00
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#include "ethernet.h"
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2003-07-17 15:06:27 +00:00
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#include "event.h"
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#include "graph.h"
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#include "list.h"
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#include "logger.h"
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2002-02-18 16:25:19 +00:00
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#include "net.h"
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#include "netutl.h"
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#include "protocol.h"
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#include "process.h"
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#include "route.h"
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2003-07-17 15:06:27 +00:00
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#include "utils.h"
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#include "xalloc.h"
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2002-02-18 16:25:19 +00:00
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2003-12-22 11:04:17 +00:00
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#ifdef WSAEMSGSIZE
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#define EMSGSIZE WSAEMSGSIZE
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#endif
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2002-02-18 16:25:19 +00:00
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int keylifetime = 0;
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int keyexpires = 0;
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2003-03-28 13:41:49 +00:00
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EVP_CIPHER_CTX packet_ctx;
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2003-07-06 23:16:29 +00:00
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static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
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2003-05-06 21:13:18 +00:00
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2003-12-20 19:47:53 +00:00
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static void send_udppacket(node_t *, vpn_packet_t *);
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2002-02-18 16:25:19 +00:00
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#define MAX_SEQNO 1073741824
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2003-12-20 19:47:53 +00:00
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void send_mtu_probe(node_t *n)
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{
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vpn_packet_t packet;
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int len, i;
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cp();
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n->mtuprobes++;
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2003-12-22 11:04:17 +00:00
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n->mtuevent = NULL;
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2003-12-20 19:47:53 +00:00
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2003-12-22 11:04:17 +00:00
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if(n->mtuprobes >= 10 && !n->minmtu) {
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2003-12-20 21:09:33 +00:00
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ifdebug(TRAFFIC) logger(LOG_INFO, _("No response to MTU probes from %s (%s)"), n->name, n->hostname);
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return;
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}
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2003-12-20 19:47:53 +00:00
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for(i = 0; i < 3; i++) {
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2003-12-22 11:04:17 +00:00
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if(n->mtuprobes >= 30 || n->minmtu >= n->maxmtu) {
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n->mtu = n->minmtu;
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2003-12-20 19:47:53 +00:00
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ifdebug(TRAFFIC) logger(LOG_INFO, _("Fixing MTU of %s (%s) to %d after %d probes"), n->name, n->hostname, n->mtu, n->mtuprobes);
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return;
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}
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2003-12-22 11:04:17 +00:00
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len = n->minmtu + 1 + random() % (n->maxmtu - n->minmtu);
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2003-12-20 19:47:53 +00:00
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if(len < 64)
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len = 64;
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memset(packet.data, 0, 14);
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RAND_pseudo_bytes(packet.data + 14, len - 14);
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packet.len = len;
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ifdebug(TRAFFIC) logger(LOG_INFO, _("Sending MTU probe length %d to %s (%s)"), len, n->name, n->hostname);
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send_udppacket(n, &packet);
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}
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n->mtuevent = xmalloc(sizeof(*n->mtuevent));
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n->mtuevent->handler = (event_handler_t)send_mtu_probe;
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n->mtuevent->data = n;
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n->mtuevent->time = now + 1;
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event_add(n->mtuevent);
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}
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void mtu_probe_h(node_t *n, vpn_packet_t *packet) {
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ifdebug(TRAFFIC) logger(LOG_INFO, _("Got MTU probe length %d from %s (%s)"), packet->len, n->name, n->hostname);
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if(!packet->data[0]) {
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packet->data[0] = 1;
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send_packet(n, packet);
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} else {
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2003-12-22 11:04:17 +00:00
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if(n->minmtu < packet->len)
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n->minmtu = packet->len;
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2003-12-20 19:47:53 +00:00
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}
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}
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2003-07-06 23:16:29 +00:00
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static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
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2003-05-06 21:13:18 +00:00
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{
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if(level == 10) {
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2003-05-07 11:21:58 +00:00
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lzo_uint lzolen = MAXSIZE;
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2003-05-06 21:13:18 +00:00
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lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
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return lzolen;
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} else if(level < 10) {
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2003-05-06 23:14:45 +00:00
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unsigned long destlen = MAXSIZE;
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2003-05-06 21:13:18 +00:00
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if(compress2(dest, &destlen, source, len, level) == Z_OK)
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return destlen;
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else
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return -1;
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} else {
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2003-05-07 11:21:58 +00:00
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lzo_uint lzolen = MAXSIZE;
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2003-05-06 21:13:18 +00:00
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lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem);
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return lzolen;
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}
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return -1;
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}
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2003-07-06 23:16:29 +00:00
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static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
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2003-05-06 21:13:18 +00:00
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{
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if(level > 9) {
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2003-05-07 11:21:58 +00:00
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lzo_uint lzolen = MAXSIZE;
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2003-05-06 21:13:18 +00:00
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if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK)
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return lzolen;
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else
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return -1;
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} else {
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2003-05-06 23:14:45 +00:00
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unsigned long destlen = MAXSIZE;
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2003-05-06 21:13:18 +00:00
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if(uncompress(dest, &destlen, source, len) == Z_OK)
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return destlen;
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else
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return -1;
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}
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return -1;
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}
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2002-02-18 16:25:19 +00:00
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/* VPN packet I/O */
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2003-07-06 23:16:29 +00:00
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static void receive_packet(node_t *n, vpn_packet_t *packet)
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{
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cp();
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2003-07-12 17:41:48 +00:00
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"),
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2003-07-06 23:16:29 +00:00
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packet->len, n->name, n->hostname);
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2003-12-12 19:52:25 +00:00
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route(n, packet);
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2003-07-06 23:16:29 +00:00
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}
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static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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vpn_packet_t pkt1, pkt2;
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vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
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int nextpkt = 0;
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vpn_packet_t *outpkt = pkt[0];
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int outlen, outpad;
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2004-03-20 22:23:42 +00:00
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char hmac[EVP_MAX_MD_SIZE];
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2003-10-11 12:16:13 +00:00
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int i;
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2002-09-09 21:25:28 +00:00
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cp();
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2004-03-20 22:23:42 +00:00
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/* Check packet length */
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if(inpkt->len < sizeof(inpkt->seqno) + myself->maclength) {
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"),
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n->name, n->hostname);
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2003-09-23 20:59:01 +00:00
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return;
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}
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2004-03-20 22:23:42 +00:00
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/* Check the message authentication code */
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if(myself->digest && myself->maclength) {
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inpkt->len -= myself->maclength;
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HMAC(myself->digest, myself->key, myself->keylength,
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(char *) &inpkt->seqno, inpkt->len, hmac, NULL);
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if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) {
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"),
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n->name, n->hostname);
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return;
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}
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}
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2002-09-09 21:25:28 +00:00
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/* Decrypt the packet */
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if(myself->cipher) {
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outpkt = pkt[nextpkt++];
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2003-10-11 12:16:13 +00:00
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if(!EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL)
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|| !EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen,
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(char *) &inpkt->seqno, inpkt->len)
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|| !EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) {
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2003-10-10 16:24:24 +00:00
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"),
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n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
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return;
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}
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2003-03-28 13:41:49 +00:00
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2002-09-09 21:25:28 +00:00
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outpkt->len = outlen + outpad;
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inpkt = outpkt;
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}
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/* Check the sequence number */
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inpkt->len -= sizeof(inpkt->seqno);
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inpkt->seqno = ntohl(inpkt->seqno);
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2003-04-18 21:18:36 +00:00
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if(inpkt->seqno != n->received_seqno + 1) {
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if(inpkt->seqno >= n->received_seqno + sizeof(n->late) * 8) {
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2003-07-12 17:41:48 +00:00
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logger(LOG_WARNING, _("Lost %d packets from %s (%s)"),
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2003-04-18 21:18:36 +00:00
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inpkt->seqno - n->received_seqno - 1, n->name, n->hostname);
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memset(n->late, 0, sizeof(n->late));
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} else if (inpkt->seqno <= n->received_seqno) {
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if(inpkt->seqno <= n->received_seqno - sizeof(n->late) * 8 || !(n->late[(inpkt->seqno / 8) % sizeof(n->late)] & (1 << inpkt->seqno % 8))) {
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2003-07-12 17:41:48 +00:00
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logger(LOG_WARNING, _("Got late or replayed packet from %s (%s), seqno %d, last received %d"),
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2003-05-06 23:14:45 +00:00
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n->name, n->hostname, inpkt->seqno, n->received_seqno);
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2004-09-20 20:55:49 +00:00
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return;
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}
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} else {
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for(i = n->received_seqno + 1; i < inpkt->seqno; i++)
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n->late[(inpkt->seqno / 8) % sizeof(n->late)] |= 1 << i % 8;
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2003-04-18 21:18:36 +00:00
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}
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2002-09-09 21:25:28 +00:00
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}
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2003-04-18 21:18:36 +00:00
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2004-11-08 22:30:13 +00:00
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n->late[(inpkt->seqno / 8) % sizeof(n->late)] &= ~(1 << inpkt->seqno % 8);
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if(n->received_seqno > inpkt->seqno)
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n->received_seqno = inpkt->seqno;
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2003-04-18 21:18:36 +00:00
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2002-09-09 21:25:28 +00:00
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if(n->received_seqno > MAX_SEQNO)
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keyexpires = 0;
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/* Decompress the packet */
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if(myself->compression) {
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outpkt = pkt[nextpkt++];
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2003-05-06 21:13:18 +00:00
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if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, myself->compression)) < 0) {
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2003-10-10 16:24:24 +00:00
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ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"),
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n->name, n->hostname);
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2002-09-09 21:25:28 +00:00
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return;
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}
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inpkt = outpkt;
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}
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2003-09-23 20:59:01 +00:00
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if(n->connection)
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n->connection->last_ping_time = now;
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2003-12-20 19:47:53 +00:00
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if(!inpkt->data[12] && !inpkt->data[13])
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mtu_probe_h(n, inpkt);
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else
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receive_packet(n, inpkt);
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2002-02-18 16:25:19 +00:00
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}
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2002-09-09 22:33:31 +00:00
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void receive_tcppacket(connection_t *c, char *buffer, int len)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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vpn_packet_t outpkt;
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cp();
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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outpkt.len = len;
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memcpy(outpkt.data, buffer, len);
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receive_packet(c->node, &outpkt);
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2002-02-18 16:25:19 +00:00
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}
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2003-07-06 23:16:29 +00:00
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static void send_udppacket(node_t *n, vpn_packet_t *inpkt)
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2002-02-18 16:25:19 +00:00
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{
|
2002-09-09 21:25:28 +00:00
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vpn_packet_t pkt1, pkt2;
|
|
|
|
vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
|
|
|
|
int nextpkt = 0;
|
|
|
|
vpn_packet_t *outpkt;
|
|
|
|
int origlen;
|
|
|
|
int outlen, outpad;
|
|
|
|
vpn_packet_t *copy;
|
|
|
|
static int priority = 0;
|
|
|
|
int origpriority;
|
|
|
|
int sock;
|
2002-03-18 22:47:20 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
cp();
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Make sure we have a valid key */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(!n->status.validkey) {
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_INFO,
|
2002-09-09 21:25:28 +00:00
|
|
|
_("No valid key known yet for %s (%s), queueing packet"),
|
|
|
|
n->name, n->hostname);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Since packet is on the stack of handle_tap_input(), we have to make a copy of it first. */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2003-12-12 19:52:25 +00:00
|
|
|
*(copy = xmalloc(sizeof(*copy))) = *inpkt;
|
2002-03-27 15:01:37 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
list_insert_tail(n->queue, copy);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(n->queue->count > MAXQUEUELENGTH)
|
|
|
|
list_delete_head(n->queue);
|
2002-03-25 15:51:58 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(!n->status.waitingforkey)
|
|
|
|
send_req_key(n->nexthop->connection, myself, n);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2003-07-22 20:55:21 +00:00
|
|
|
n->status.waitingforkey = true;
|
2002-02-20 19:31:15 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
return;
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
origlen = inpkt->len;
|
|
|
|
origpriority = inpkt->priority;
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Compress the packet */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(n->compression) {
|
|
|
|
outpkt = pkt[nextpkt++];
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2003-05-06 21:13:18 +00:00
|
|
|
if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->compression)) < 0) {
|
2003-10-10 16:24:24 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while compressing packet to %s (%s)"),
|
2002-09-09 21:25:28 +00:00
|
|
|
n->name, n->hostname);
|
|
|
|
return;
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
inpkt = outpkt;
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Add sequence number */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
inpkt->seqno = htonl(++(n->sent_seqno));
|
|
|
|
inpkt->len += sizeof(inpkt->seqno);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Encrypt the packet */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(n->cipher) {
|
|
|
|
outpkt = pkt[nextpkt++];
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2003-10-11 12:16:13 +00:00
|
|
|
if(!EVP_EncryptInit_ex(&n->packet_ctx, NULL, NULL, NULL, NULL)
|
|
|
|
|| !EVP_EncryptUpdate(&n->packet_ctx, (char *) &outpkt->seqno, &outlen,
|
|
|
|
(char *) &inpkt->seqno, inpkt->len)
|
|
|
|
|| !EVP_EncryptFinal_ex(&n->packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) {
|
2003-10-10 16:24:24 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"),
|
|
|
|
n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
|
2003-12-24 10:48:15 +00:00
|
|
|
goto end;
|
2003-10-10 16:24:24 +00:00
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
outpkt->len = outlen + outpad;
|
|
|
|
inpkt = outpkt;
|
|
|
|
}
|
2002-03-18 22:47:20 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Add the message authentication code */
|
2002-03-18 22:47:20 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(n->digest && n->maclength) {
|
|
|
|
HMAC(n->digest, n->key, n->keylength, (char *) &inpkt->seqno,
|
|
|
|
inpkt->len, (char *) &inpkt->seqno + inpkt->len, &outlen);
|
|
|
|
inpkt->len += n->maclength;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Determine which socket we have to use */
|
|
|
|
|
|
|
|
for(sock = 0; sock < listen_sockets; sock++)
|
|
|
|
if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if(sock >= listen_sockets)
|
|
|
|
sock = 0; /* If none is available, just use the first and hope for the best. */
|
|
|
|
|
|
|
|
/* Send the packet */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-03-01 15:14:29 +00:00
|
|
|
#if defined(SOL_IP) && defined(IP_TOS)
|
2002-09-09 21:25:28 +00:00
|
|
|
if(priorityinheritance && origpriority != priority
|
|
|
|
&& listen_socket[sock].sa.sa.sa_family == AF_INET) {
|
|
|
|
priority = origpriority;
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority);
|
2002-11-14 22:09:03 +00:00
|
|
|
if(setsockopt(listen_socket[sock].udp, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */
|
2003-08-08 19:42:35 +00:00
|
|
|
logger(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt", strerror(errno));
|
2002-09-09 21:25:28 +00:00
|
|
|
}
|
2002-03-01 15:14:29 +00:00
|
|
|
#endif
|
2002-03-01 12:26:56 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) {
|
2003-12-20 19:47:53 +00:00
|
|
|
if(errno == EMSGSIZE) {
|
2003-12-22 11:04:17 +00:00
|
|
|
if(n->maxmtu >= origlen)
|
|
|
|
n->maxmtu = origlen - 1;
|
2003-12-20 19:47:53 +00:00
|
|
|
if(n->mtu >= origlen)
|
|
|
|
n->mtu = origlen - 1;
|
2003-12-24 10:48:15 +00:00
|
|
|
} else
|
|
|
|
logger(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name, n->hostname, strerror(errno));
|
2002-09-09 21:25:28 +00:00
|
|
|
}
|
|
|
|
|
2003-12-24 10:48:15 +00:00
|
|
|
end:
|
2002-09-09 21:25:28 +00:00
|
|
|
inpkt->len = origlen;
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
send a packet to the given vpn ip.
|
|
|
|
*/
|
2003-07-24 12:08:16 +00:00
|
|
|
void send_packet(const node_t *n, vpn_packet_t *packet)
|
2002-02-18 16:25:19 +00:00
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
node_t *via;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
|
|
|
if(n == myself) {
|
2003-12-27 16:32:52 +00:00
|
|
|
if(overwrite_mac)
|
|
|
|
memcpy(packet->data, mymac.x, ETH_ALEN);
|
2003-12-12 19:52:25 +00:00
|
|
|
write_packet(packet);
|
2002-09-09 21:25:28 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2003-12-12 19:52:25 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
|
|
|
|
packet->len, n->name, n->hostname);
|
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(!n->status.reachable) {
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_INFO, _("Node %s (%s) is not reachable"),
|
2002-09-09 21:25:28 +00:00
|
|
|
n->name, n->hostname);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
via = (n->via == myself) ? n->nexthop : n->via;
|
|
|
|
|
2003-07-06 22:11:37 +00:00
|
|
|
if(via != n)
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet to %s via %s (%s)"),
|
2002-09-09 21:25:28 +00:00
|
|
|
n->name, via->name, n->via->hostname);
|
|
|
|
|
|
|
|
if((myself->options | via->options) & OPTION_TCPONLY) {
|
2003-07-22 20:55:21 +00:00
|
|
|
if(!send_tcppacket(via->connection, packet))
|
|
|
|
terminate_connection(via->connection, true);
|
2002-09-09 21:25:28 +00:00
|
|
|
} else
|
|
|
|
send_udppacket(via, packet);
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Broadcast a packet using the minimum spanning tree */
|
|
|
|
|
2003-07-24 12:08:16 +00:00
|
|
|
void broadcast_packet(const node_t *from, vpn_packet_t *packet)
|
2002-02-18 16:25:19 +00:00
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
avl_node_t *node;
|
|
|
|
connection_t *c;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
|
2002-09-09 21:25:28 +00:00
|
|
|
packet->len, from->name, from->hostname);
|
|
|
|
|
|
|
|
for(node = connection_tree->head; node; node = node->next) {
|
2003-08-28 21:05:11 +00:00
|
|
|
c = node->data;
|
2002-09-09 21:25:28 +00:00
|
|
|
|
|
|
|
if(c->status.active && c->status.mst && c != from->nexthop->connection)
|
|
|
|
send_packet(c->node, packet);
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
2002-09-09 22:33:31 +00:00
|
|
|
void flush_queue(node_t *n)
|
2002-02-18 16:25:19 +00:00
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
list_node_t *node, *next;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(TRAFFIC) logger(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
|
2002-09-09 21:25:28 +00:00
|
|
|
|
|
|
|
for(node = n->queue->head; node; node = next) {
|
|
|
|
next = node->next;
|
2003-08-28 21:05:11 +00:00
|
|
|
send_udppacket(n, node->data);
|
2002-09-09 21:25:28 +00:00
|
|
|
list_delete_node(n->queue, node);
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
2002-02-26 23:26:41 +00:00
|
|
|
void handle_incoming_vpn_data(int sock)
|
2002-02-18 16:25:19 +00:00
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
vpn_packet_t pkt;
|
|
|
|
char *hostname;
|
|
|
|
sockaddr_t from;
|
|
|
|
socklen_t fromlen = sizeof(from);
|
|
|
|
node_t *n;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
|
|
|
pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
|
|
|
|
|
2003-09-23 20:59:01 +00:00
|
|
|
if(pkt.len < 0) {
|
2003-07-12 17:41:48 +00:00
|
|
|
logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
|
2002-09-09 21:25:28 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */
|
|
|
|
|
|
|
|
n = lookup_node_udp(&from);
|
|
|
|
|
|
|
|
if(!n) {
|
|
|
|
hostname = sockaddr2hostname(&from);
|
2004-03-20 22:23:42 +00:00
|
|
|
logger(LOG_WARNING, _("Received UDP packet from unknown source %s"),
|
|
|
|
hostname);
|
2002-09-09 21:25:28 +00:00
|
|
|
free(hostname);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
receive_udppacket(n, &pkt);
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|