652 lines
17 KiB
C
652 lines
17 KiB
C
/*
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net_packet.c -- Handles in- and outgoing VPN packets
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Copyright (C) 1998-2005 Ivo Timmermans,
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2000-2011 Guus Sliepen <guus@tinc-vpn.org>
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2010 Timothy Redaelli <timothy@redaelli.eu>
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2010 Brandon Black <blblack@gmail.com>
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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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "system.h"
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#include <openssl/rand.h>
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#include <openssl/err.h>
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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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#ifdef HAVE_ZLIB
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#include <zlib.h>
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#endif
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#ifdef HAVE_LZO
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#include LZO1X_H
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#endif
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#include "splay_tree.h"
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#include "cipher.h"
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#include "conf.h"
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#include "connection.h"
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#include "crypto.h"
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#include "digest.h"
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#include "device.h"
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#include "ethernet.h"
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#include "graph.h"
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#include "logger.h"
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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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#include "utils.h"
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#include "xalloc.h"
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int keylifetime = 0;
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#ifdef HAVE_LZO
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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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#endif
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static void send_udppacket(node_t *, vpn_packet_t *);
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unsigned replaywin = 16;
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#define MAX_SEQNO 1073741824
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// mtuprobes == 1..30: initial discovery, send bursts with 1 second interval
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// mtuprobes == 31: sleep pinginterval seconds
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// mtuprobes == 32: send 1 burst, sleep pingtimeout second
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// mtuprobes == 33: no response from other side, restart PMTU discovery process
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static void send_mtu_probe_handler(int fd, short events, void *data) {
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node_t *n = data;
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vpn_packet_t packet;
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int len, i;
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int timeout = 1;
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n->mtuprobes++;
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if(!n->status.reachable || !n->status.validkey) {
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ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send MTU probe to unreachable or rekeying node %s (%s)", n->name, n->hostname);
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n->mtuprobes = 0;
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return;
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}
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if(n->mtuprobes > 32) {
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if(!n->minmtu) {
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n->mtuprobes = 31;
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timeout = pinginterval;
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goto end;
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}
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ifdebug(TRAFFIC) logger(LOG_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname);
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n->mtuprobes = 1;
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n->minmtu = 0;
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n->maxmtu = MTU;
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}
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if(n->mtuprobes >= 10 && n->mtuprobes < 32 && !n->minmtu) {
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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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n->mtuprobes = 31;
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}
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if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) {
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if(n->minmtu > n->maxmtu)
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n->minmtu = n->maxmtu;
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else
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n->maxmtu = n->minmtu;
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n->mtu = n->minmtu;
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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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n->mtuprobes = 31;
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}
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if(n->mtuprobes == 31) {
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timeout = pinginterval;
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goto end;
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} else if(n->mtuprobes == 32) {
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timeout = pingtimeout;
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}
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for(i = 0; i < 3; i++) {
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if(n->maxmtu <= n->minmtu)
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len = n->maxmtu;
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else
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len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
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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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randomize(packet.data + 14, len - 14);
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packet.len = len;
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packet.priority = 0;
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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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end:
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event_add(&n->mtuevent, &(struct timeval){timeout, 0});
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}
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void send_mtu_probe(node_t *n) {
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if(!timeout_initialized(&n->mtuevent))
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timeout_set(&n->mtuevent, send_mtu_probe_handler, n);
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send_mtu_probe_handler(0, 0, n);
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}
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static void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
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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_udppacket(n, packet);
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} else {
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if(n->mtuprobes > 30) {
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if(n->minmtu)
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n->mtuprobes = 30;
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else
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n->mtuprobes = 1;
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}
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if(len > n->maxmtu)
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len = n->maxmtu;
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if(n->minmtu < len)
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n->minmtu = len;
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}
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}
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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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if(level == 0) {
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memcpy(dest, source, len);
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return len;
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} else if(level == 10) {
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#ifdef HAVE_LZO
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lzo_uint lzolen = MAXSIZE;
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lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
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return lzolen;
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#else
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return -1;
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#endif
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} else if(level < 10) {
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#ifdef HAVE_ZLIB
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unsigned long destlen = MAXSIZE;
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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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#endif
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return -1;
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} else {
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#ifdef HAVE_LZO
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lzo_uint lzolen = MAXSIZE;
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lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem);
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return lzolen;
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#else
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return -1;
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#endif
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}
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return -1;
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}
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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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if(level == 0) {
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memcpy(dest, source, len);
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return len;
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} else if(level > 9) {
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#ifdef HAVE_LZO
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lzo_uint lzolen = MAXSIZE;
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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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#endif
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return -1;
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}
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#ifdef HAVE_ZLIB
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else {
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unsigned long destlen = MAXSIZE;
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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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#endif
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return -1;
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}
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/* VPN packet I/O */
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static void receive_packet(node_t *n, vpn_packet_t *packet) {
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ifdebug(TRAFFIC) logger(LOG_DEBUG, "Received packet of %d bytes from %s (%s)",
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packet->len, n->name, n->hostname);
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n->in_packets++;
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n->in_bytes += packet->len;
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route(n, packet);
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}
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static bool try_mac(node_t *n, const vpn_packet_t *inpkt) {
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if(!digest_active(&n->indigest) || inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest))
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return false;
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return digest_verify(&n->indigest, &inpkt->seqno, inpkt->len - n->indigest.maclength, (const char *)&inpkt->seqno + inpkt->len - n->indigest.maclength);
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}
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static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
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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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size_t outlen;
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if(!cipher_active(&n->incipher)) {
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ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet",
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n->name, n->hostname);
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return;
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}
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/* Check packet length */
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if(inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest)) {
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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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return;
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}
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/* Check the message authentication code */
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if(digest_active(&n->indigest)) {
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inpkt->len -= n->indigest.maclength;
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if(!digest_verify(&n->indigest, &inpkt->seqno, inpkt->len, (const char *)&inpkt->seqno + inpkt->len)) {
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ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got unauthenticated packet from %s (%s)", n->name, n->hostname);
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return;
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}
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}
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/* Decrypt the packet */
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if(cipher_active(&n->incipher)) {
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outpkt = pkt[nextpkt++];
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outlen = MAXSIZE;
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if(!cipher_decrypt(&n->incipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
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ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error decrypting packet from %s (%s)", n->name, n->hostname);
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return;
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}
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outpkt->len = outlen;
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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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if(replaywin) {
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if(inpkt->seqno != n->received_seqno + 1) {
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if(inpkt->seqno >= n->received_seqno + replaywin * 8) {
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if(n->farfuture++ < replaywin >> 2) {
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logger(LOG_WARNING, "Packet from %s (%s) is %d seqs in the future, dropped (%u)",
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n->name, n->hostname, inpkt->seqno - n->received_seqno - 1, n->farfuture);
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return;
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}
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logger(LOG_WARNING, "Lost %d packets from %s (%s)",
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inpkt->seqno - n->received_seqno - 1, n->name, n->hostname);
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memset(n->late, 0, replaywin);
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} else if (inpkt->seqno <= n->received_seqno) {
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if((n->received_seqno >= replaywin * 8 && inpkt->seqno <= n->received_seqno - replaywin * 8) || !(n->late[(inpkt->seqno / 8) % replaywin] & (1 << inpkt->seqno % 8))) {
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logger(LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d",
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n->name, n->hostname, inpkt->seqno, n->received_seqno);
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return;
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}
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} else {
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for(int i = n->received_seqno + 1; i < inpkt->seqno; i++)
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n->late[(i / 8) % replaywin] |= 1 << i % 8;
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}
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}
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n->farfuture = 0;
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n->late[(inpkt->seqno / 8) % replaywin] &= ~(1 << inpkt->seqno % 8);
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}
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if(inpkt->seqno > n->received_seqno)
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n->received_seqno = inpkt->seqno;
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if(n->received_seqno > MAX_SEQNO)
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regenerate_key();
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/* Decompress the packet */
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length_t origlen = inpkt->len;
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if(n->incompression) {
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outpkt = pkt[nextpkt++];
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if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, n->incompression)) < 0) {
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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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return;
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}
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inpkt = outpkt;
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origlen -= MTU/64 + 20;
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}
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inpkt->priority = 0;
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if(!inpkt->data[12] && !inpkt->data[13])
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mtu_probe_h(n, inpkt, origlen);
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else
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receive_packet(n, inpkt);
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}
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void receive_tcppacket(connection_t *c, const char *buffer, int len) {
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vpn_packet_t outpkt;
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outpkt.len = len;
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if(c->options & OPTION_TCPONLY)
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outpkt.priority = 0;
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else
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outpkt.priority = -1;
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memcpy(outpkt.data, buffer, len);
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receive_packet(c->node, &outpkt);
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}
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static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
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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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vpn_packet_t *inpkt = origpkt;
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int nextpkt = 0;
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vpn_packet_t *outpkt;
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int origlen = origpkt->len;
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size_t outlen;
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#if defined(SOL_IP) && defined(IP_TOS)
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static int priority = 0;
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int origpriority = origpkt->priority;
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#endif
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int sock;
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if(!n->status.reachable) {
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ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
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return;
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}
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/* Make sure we have a valid key */
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if(!n->status.validkey) {
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time_t now = time(NULL);
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ifdebug(TRAFFIC) logger(LOG_INFO,
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"No valid key known yet for %s (%s), forwarding via TCP",
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n->name, n->hostname);
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if(n->last_req_key + 10 <= now) {
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send_req_key(n);
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n->last_req_key = now;
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}
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send_tcppacket(n->nexthop->connection, origpkt);
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return;
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}
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if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (inpkt->data[12] | inpkt->data[13])) {
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ifdebug(TRAFFIC) logger(LOG_INFO,
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"Packet for %s (%s) larger than minimum MTU, forwarding via %s",
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n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP");
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if(n != n->nexthop)
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send_packet(n->nexthop, origpkt);
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else
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send_tcppacket(n->nexthop->connection, origpkt);
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return;
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}
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/* Compress the packet */
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if(n->outcompression) {
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outpkt = pkt[nextpkt++];
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if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->outcompression)) < 0) {
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ifdebug(TRAFFIC) logger(LOG_ERR, "Error while compressing packet to %s (%s)",
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n->name, n->hostname);
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return;
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}
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inpkt = outpkt;
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}
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/* Add sequence number */
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inpkt->seqno = htonl(++(n->sent_seqno));
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inpkt->len += sizeof inpkt->seqno;
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/* Encrypt the packet */
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if(cipher_active(&n->outcipher)) {
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outpkt = pkt[nextpkt++];
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outlen = MAXSIZE;
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if(!cipher_encrypt(&n->outcipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
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ifdebug(TRAFFIC) logger(LOG_ERR, "Error while encrypting packet to %s (%s)", n->name, n->hostname);
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goto end;
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}
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outpkt->len = outlen;
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inpkt = outpkt;
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}
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/* Add the message authentication code */
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if(digest_active(&n->outdigest)) {
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digest_create(&n->outdigest, &inpkt->seqno, inpkt->len, (char *)&inpkt->seqno + inpkt->len);
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inpkt->len += digest_length(&n->outdigest);
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}
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/* Determine which socket we have to use */
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for(sock = 0; sock < listen_sockets; sock++)
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if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family)
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break;
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if(sock >= listen_sockets)
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sock = 0; /* If none is available, just use the first and hope for the best. */
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/* Send the packet */
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#if defined(SOL_IP) && defined(IP_TOS)
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if(priorityinheritance && origpriority != priority
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&& listen_socket[sock].sa.sa.sa_family == AF_INET) {
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priority = origpriority;
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ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting outgoing packet priority to %d", priority);
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if(setsockopt(listen_socket[sock].udp, SOL_IP, IP_TOS, &priority, sizeof priority)) /* SO_PRIORITY doesn't seem to work */
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logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno));
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}
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#endif
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|
|
if(sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa)) < 0 && !sockwouldblock(sockerrno)) {
|
|
if(sockmsgsize(sockerrno)) {
|
|
if(n->maxmtu >= origlen)
|
|
n->maxmtu = origlen - 1;
|
|
if(n->mtu >= origlen)
|
|
n->mtu = origlen - 1;
|
|
} else
|
|
logger(LOG_ERR, "Error sending packet to %s (%s): %s", n->name, n->hostname, sockstrerror(sockerrno));
|
|
}
|
|
|
|
end:
|
|
origpkt->len = origlen;
|
|
}
|
|
|
|
/*
|
|
send a packet to the given vpn ip.
|
|
*/
|
|
void send_packet(node_t *n, vpn_packet_t *packet) {
|
|
node_t *via;
|
|
|
|
if(n == myself) {
|
|
if(overwrite_mac)
|
|
memcpy(packet->data, mymac.x, ETH_ALEN);
|
|
n->out_packets++;
|
|
n->out_bytes += packet->len;
|
|
write_packet(packet);
|
|
return;
|
|
}
|
|
|
|
ifdebug(TRAFFIC) logger(LOG_ERR, "Sending packet of %d bytes to %s (%s)",
|
|
packet->len, n->name, n->hostname);
|
|
|
|
if(!n->status.reachable) {
|
|
ifdebug(TRAFFIC) logger(LOG_INFO, "Node %s (%s) is not reachable",
|
|
n->name, n->hostname);
|
|
return;
|
|
}
|
|
|
|
n->out_packets++;
|
|
n->out_bytes += packet->len;
|
|
|
|
via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via;
|
|
|
|
if(via != n)
|
|
ifdebug(TRAFFIC) logger(LOG_INFO, "Sending packet to %s via %s (%s)",
|
|
n->name, via->name, n->via->hostname);
|
|
|
|
if(packet->priority == -1 || ((myself->options | via->options) & OPTION_TCPONLY)) {
|
|
if(!send_tcppacket(via->connection, packet))
|
|
terminate_connection(via->connection, true);
|
|
} else
|
|
send_udppacket(via, packet);
|
|
}
|
|
|
|
/* Broadcast a packet using the minimum spanning tree */
|
|
|
|
void broadcast_packet(const node_t *from, vpn_packet_t *packet) {
|
|
splay_node_t *node;
|
|
connection_t *c;
|
|
|
|
ifdebug(TRAFFIC) logger(LOG_INFO, "Broadcasting packet of %d bytes from %s (%s)",
|
|
packet->len, from->name, from->hostname);
|
|
|
|
if(from != myself) {
|
|
send_packet(myself, packet);
|
|
|
|
// In TunnelServer mode, do not forward broadcast packets.
|
|
// The MST might not be valid and create loops.
|
|
if(tunnelserver)
|
|
return;
|
|
}
|
|
|
|
for(node = connection_tree->head; node; node = node->next) {
|
|
c = node->data;
|
|
|
|
if(c->status.active && c->status.mst && c != from->nexthop->connection)
|
|
send_packet(c->node, packet);
|
|
}
|
|
}
|
|
|
|
static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) {
|
|
splay_node_t *node;
|
|
edge_t *e;
|
|
node_t *n = NULL;
|
|
bool hard = false;
|
|
static time_t last_hard_try = 0;
|
|
time_t now = time(NULL);
|
|
|
|
if(last_hard_try == now)
|
|
return NULL;
|
|
else
|
|
last_hard_try = now;
|
|
|
|
for(node = edge_weight_tree->head; node; node = node->next) {
|
|
e = node->data;
|
|
|
|
if(e->to == myself)
|
|
continue;
|
|
|
|
if(sockaddrcmp_noport(from, &e->address)) {
|
|
if(last_hard_try == now)
|
|
continue;
|
|
hard = true;
|
|
}
|
|
|
|
if(!try_mac(e->to, pkt))
|
|
continue;
|
|
|
|
n = e->to;
|
|
break;
|
|
}
|
|
|
|
if(hard)
|
|
last_hard_try = now;
|
|
|
|
return n;
|
|
}
|
|
|
|
void handle_incoming_vpn_data(int sock, short events, void *data) {
|
|
vpn_packet_t pkt;
|
|
char *hostname;
|
|
sockaddr_t from;
|
|
socklen_t fromlen = sizeof from;
|
|
node_t *n;
|
|
int len;
|
|
|
|
len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
|
|
|
|
if(len <= 0 || len > MAXSIZE) {
|
|
if(!sockwouldblock(sockerrno))
|
|
logger(LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno));
|
|
return;
|
|
}
|
|
|
|
pkt.len = len;
|
|
|
|
sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */
|
|
|
|
n = lookup_node_udp(&from);
|
|
|
|
if(!n) {
|
|
n = try_harder(&from, &pkt);
|
|
if(n)
|
|
update_node_udp(n, &from);
|
|
else ifdebug(PROTOCOL) {
|
|
hostname = sockaddr2hostname(&from);
|
|
logger(LOG_WARNING, "Received UDP packet from unknown source %s", hostname);
|
|
free(hostname);
|
|
return;
|
|
}
|
|
else
|
|
return;
|
|
}
|
|
|
|
receive_udppacket(n, &pkt);
|
|
}
|
|
|
|
void handle_device_data(int sock, short events, void *data) {
|
|
vpn_packet_t packet;
|
|
|
|
packet.priority = 0;
|
|
|
|
if(read_packet(&packet)) {
|
|
myself->in_packets++;
|
|
myself->in_bytes += packet.len;
|
|
route(myself, &packet);
|
|
}
|
|
}
|