/*
net_packet.c -- Handles in- and outgoing VPN packets
- Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 1998-2005 Ivo Timmermans,
+ 2000-2006 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: net_packet.c,v 1.1.2.49 2003/12/27 16:32:52 guus Exp $
+ $Id$
*/
#include "system.h"
#include <openssl/hmac.h>
#include <zlib.h>
-#include <lzo1x.h>
+#include LZO1X_H
#include "avl_tree.h"
#include "conf.h"
#include "connection.h"
#include "device.h"
#include "ethernet.h"
-#include "event.h"
#include "graph.h"
#include "list.h"
#include "logger.h"
#endif
int keylifetime = 0;
-int keyexpires = 0;
-bool strictsource = true;
EVP_CIPHER_CTX packet_ctx;
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
#define MAX_SEQNO 1073741824
-void send_mtu_probe(node_t *n)
-{
+static void send_mtu_probe_handler(int fd, short events, void *data) {
+ node_t *n = data;
vpn_packet_t packet;
int len, i;
cp();
n->mtuprobes++;
- n->mtuevent = NULL;
if(n->mtuprobes >= 10 && !n->minmtu) {
ifdebug(TRAFFIC) logger(LOG_INFO, _("No response to MTU probes from %s (%s)"), n->name, n->hostname);
send_udppacket(n, &packet);
}
- n->mtuevent = xmalloc(sizeof(*n->mtuevent));
- n->mtuevent->handler = (event_handler_t)send_mtu_probe;
- n->mtuevent->data = n;
- n->mtuevent->time = now + 1;
- event_add(n->mtuevent);
+ event_add(&n->mtuevent, &(struct timeval){1, 0});
+}
+
+void send_mtu_probe(node_t *n) {
+ if(!timeout_initialized(&n->mtuevent))
+ timeout_set(&n->mtuevent, send_mtu_probe_handler, n);
+ send_mtu_probe_handler(0, 0, n);
}
void mtu_probe_h(node_t *n, vpn_packet_t *packet) {
}
}
-static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
-{
+static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
if(level == 10) {
lzo_uint lzolen = MAXSIZE;
lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
return -1;
}
-static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
-{
+static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
if(level > 9) {
lzo_uint lzolen = MAXSIZE;
if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK)
/* VPN packet I/O */
-static void receive_packet(node_t *n, vpn_packet_t *packet)
-{
+static void receive_packet(node_t *n, vpn_packet_t *packet) {
cp();
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"),
route(n, packet);
}
-static bool authenticate_udppacket(node_t *n, vpn_packet_t *inpkt) {
- char hmac[EVP_MAX_MD_SIZE];
-
- if(inpkt->len < sizeof(inpkt->seqno) + (myself->digest ? myself->maclength : 0))
- return false;
-
- /* Check the message authentication code */
-
- if(myself->digest && myself->maclength) {
- HMAC(myself->digest, myself->key, myself->keylength,
- (char *) &inpkt->seqno, inpkt->len - myself->maclength, hmac, NULL);
-
- if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len - myself->maclength, myself->maclength))
- return false;
- }
-
- return true;
-}
-
-static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
+static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
vpn_packet_t pkt1, pkt2;
vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
int nextpkt = 0;
vpn_packet_t *outpkt = pkt[0];
int outlen, outpad;
+ unsigned char hmac[EVP_MAX_MD_SIZE];
int i;
cp();
- if(!authenticate_udppacket(n, inpkt)) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"),
- n->name, n->hostname);
+ /* Check packet length */
+
+ if(inpkt->len < sizeof(inpkt->seqno) + myself->maclength) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"),
+ n->name, n->hostname);
return;
}
- inpkt->len -= myself->digest ? myself->maclength : 0;
+ /* Check the message authentication code */
+
+ if(myself->digest && myself->maclength) {
+ inpkt->len -= myself->maclength;
+ HMAC(myself->digest, myself->key, myself->keylength,
+ (unsigned char *) &inpkt->seqno, inpkt->len, (unsigned char *)hmac, NULL);
+
+ if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"),
+ n->name, n->hostname);
+ return;
+ }
+ }
/* Decrypt the packet */
outpkt = pkt[nextpkt++];
if(!EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL)
- || !EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen,
- (char *) &inpkt->seqno, inpkt->len)
- || !EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) {
+ || !EVP_DecryptUpdate(&packet_ctx, (unsigned char *) &outpkt->seqno, &outlen,
+ (unsigned char *) &inpkt->seqno, inpkt->len)
+ || !EVP_DecryptFinal_ex(&packet_ctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"),
n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
return;
memset(n->late, 0, sizeof(n->late));
} else if (inpkt->seqno <= n->received_seqno) {
- if(inpkt->seqno <= n->received_seqno - sizeof(n->late) * 8 || !(n->late[(inpkt->seqno / 8) % sizeof(n->late)] & (1 << inpkt->seqno % 8))) {
+ if((n->received_seqno >= sizeof(n->late) * 8 && inpkt->seqno <= n->received_seqno - sizeof(n->late) * 8) || !(n->late[(inpkt->seqno / 8) % sizeof(n->late)] & (1 << inpkt->seqno % 8))) {
logger(LOG_WARNING, _("Got late or replayed packet from %s (%s), seqno %d, last received %d"),
n->name, n->hostname, inpkt->seqno, n->received_seqno);
- } else
- for(i = n->received_seqno + 1; i < inpkt->seqno; i++)
- n->late[(inpkt->seqno / 8) % sizeof(n->late)] |= 1 << i % 8;
+ return;
+ }
+ } else {
+ for(i = n->received_seqno + 1; i < inpkt->seqno; i++)
+ n->late[(i / 8) % sizeof(n->late)] |= 1 << i % 8;
}
}
- n->received_seqno = inpkt->seqno;
- n->late[(n->received_seqno / 8) % sizeof(n->late)] &= ~(1 << n->received_seqno % 8);
+ n->late[(inpkt->seqno / 8) % sizeof(n->late)] &= ~(1 << inpkt->seqno % 8);
+
+ if(inpkt->seqno > n->received_seqno)
+ n->received_seqno = inpkt->seqno;
if(n->received_seqno > MAX_SEQNO)
- keyexpires = 0;
+ regenerate_key();
/* Decompress the packet */
inpkt = outpkt;
}
- if(n->connection)
- n->connection->last_ping_time = now;
-
if(!inpkt->data[12] && !inpkt->data[13])
mtu_probe_h(n, inpkt);
else
receive_packet(n, inpkt);
}
-void receive_tcppacket(connection_t *c, char *buffer, int len)
-{
+void receive_tcppacket(connection_t *c, char *buffer, int len) {
vpn_packet_t outpkt;
cp();
receive_packet(c->node, &outpkt);
}
-static void send_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
+static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
vpn_packet_t pkt1, pkt2;
vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
+ vpn_packet_t *inpkt = origpkt;
int nextpkt = 0;
vpn_packet_t *outpkt;
int origlen;
outpkt = pkt[nextpkt++];
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)) {
+ || !EVP_EncryptUpdate(&n->packet_ctx, (unsigned char *) &outpkt->seqno, &outlen,
+ (unsigned char *) &inpkt->seqno, inpkt->len)
+ || !EVP_EncryptFinal_ex(&n->packet_ctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"),
n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
goto end;
/* Add the message authentication code */
if(n->digest && n->maclength) {
- HMAC(n->digest, n->key, n->keylength, (char *) &inpkt->seqno,
- inpkt->len, (char *) &inpkt->seqno + inpkt->len, &outlen);
+ HMAC(n->digest, n->key, n->keylength, (unsigned char *) &inpkt->seqno,
+ inpkt->len, (unsigned char *) &inpkt->seqno + inpkt->len, NULL);
inpkt->len += n->maclength;
}
}
end:
- inpkt->len = origlen;
+ origpkt->len = origlen;
}
/*
send a packet to the given vpn ip.
*/
-void send_packet(const node_t *n, vpn_packet_t *packet)
-{
+void send_packet(const node_t *n, vpn_packet_t *packet) {
node_t *via;
cp();
/* Broadcast a packet using the minimum spanning tree */
-void broadcast_packet(const node_t *from, vpn_packet_t *packet)
-{
+void broadcast_packet(const node_t *from, vpn_packet_t *packet) {
avl_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);
+
for(node = connection_tree->head; node; node = node->next) {
c = node->data;
}
}
-void flush_queue(node_t *n)
-{
+void flush_queue(node_t *n) {
list_node_t *node, *next;
cp();
}
}
-void handle_incoming_vpn_data(int sock)
-{
+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;
- static time_t lasttime = 0;
cp();
n = lookup_node_udp(&from);
- if(!n && !strictsource && myself->digest && myself->maclength && lasttime != now) {
- avl_node_t *node;
-
- lasttime = now;
-
- for(node = node_tree->head; node; node = node->next) {
- n = node->data;
-
- if(authenticate_udppacket(n, &pkt)) {
- update_node_address(n, &from);
- logger(LOG_DEBUG, _("Updated address of node %s to %s"), n->name, n->hostname);
- break;
- }
- }
- }
-
if(!n) {
hostname = sockaddr2hostname(&from);
- logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname);
+ logger(LOG_WARNING, _("Received UDP packet from unknown source %s"),
+ hostname);
free(hostname);
return;
}
receive_udppacket(n, &pkt);
}
+
+void handle_device_data(int sock, short events, void *data) {
+ vpn_packet_t packet;
+
+ if(read_packet(&packet))
+ route(myself, &packet);
+}
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