/*
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,
+ 2000-2011 Guus Sliepen <guus@tinc-vpn.org>
+ 2010 Timothy Redaelli <timothy@redaelli.eu>
+ 2010 Brandon Black <blblack@gmail.com>
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- 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 1.1.2.36 2003/07/24 12:08:15 guus Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include <openssl/rand.h>
+#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/hmac.h>
+#ifdef HAVE_ZLIB
#include <zlib.h>
-#include <lzo1x.h>
+#endif
+
+#ifdef HAVE_LZO
+#include LZO1X_H
+#endif
-#include "avl_tree.h"
+#include "splay_tree.h"
+#include "cipher.h"
#include "conf.h"
#include "connection.h"
+#include "crypto.h"
+#include "digest.h"
#include "device.h"
-#include "event.h"
+#include "ethernet.h"
#include "graph.h"
-#include "list.h"
#include "logger.h"
#include "net.h"
#include "netutl.h"
#include "xalloc.h"
int keylifetime = 0;
-int keyexpires = 0;
-EVP_CIPHER_CTX packet_ctx;
+#ifdef HAVE_LZO
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
+#endif
+
+static void send_udppacket(node_t *, vpn_packet_t *);
+unsigned replaywin = 16;
#define MAX_SEQNO 1073741824
-static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
-{
- if(level == 10) {
+// mtuprobes == 1..30: initial discovery, send bursts with 1 second interval
+// mtuprobes == 31: sleep pinginterval seconds
+// mtuprobes == 32: send 1 burst, sleep pingtimeout second
+// mtuprobes == 33: no response from other side, restart PMTU discovery process
+
+static void send_mtu_probe_handler(int fd, short events, void *data) {
+ node_t *n = data;
+ vpn_packet_t packet;
+ int len, i;
+ int timeout = 1;
+
+ n->mtuprobes++;
+
+ if(!n->status.reachable || !n->status.validkey) {
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send MTU probe to unreachable or rekeying node %s (%s)", n->name, n->hostname);
+ n->mtuprobes = 0;
+ return;
+ }
+
+ if(n->mtuprobes > 32) {
+ if(!n->minmtu) {
+ n->mtuprobes = 31;
+ timeout = pinginterval;
+ goto end;
+ }
+
+ ifdebug(TRAFFIC) logger(LOG_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname);
+ n->mtuprobes = 1;
+ n->minmtu = 0;
+ n->maxmtu = MTU;
+ }
+
+ if(n->mtuprobes >= 10 && n->mtuprobes < 32 && !n->minmtu) {
+ ifdebug(TRAFFIC) logger(LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname);
+ n->mtuprobes = 31;
+ }
+
+ if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) {
+ if(n->minmtu > n->maxmtu)
+ n->minmtu = n->maxmtu;
+ else
+ n->maxmtu = n->minmtu;
+ n->mtu = n->minmtu;
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes);
+ n->mtuprobes = 31;
+ }
+
+ if(n->mtuprobes == 31) {
+ timeout = pinginterval;
+ goto end;
+ } else if(n->mtuprobes == 32) {
+ timeout = pingtimeout;
+ }
+
+ for(i = 0; i < 3; i++) {
+ if(n->maxmtu <= n->minmtu)
+ len = n->maxmtu;
+ else
+ len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
+
+ if(len < 64)
+ len = 64;
+
+ memset(packet.data, 0, 14);
+ randomize(packet.data + 14, len - 14);
+ packet.len = len;
+ packet.priority = 0;
+
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname);
+
+ send_udppacket(n, &packet);
+ }
+
+end:
+ event_add(&n->mtuevent, &(struct timeval){timeout, 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);
+}
+
+static void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Got MTU probe length %d from %s (%s)", packet->len, n->name, n->hostname);
+
+ if(!packet->data[0]) {
+ packet->data[0] = 1;
+ send_udppacket(n, packet);
+ } else {
+ if(n->mtuprobes > 30) {
+ if(n->minmtu)
+ n->mtuprobes = 30;
+ else
+ n->mtuprobes = 1;
+ }
+
+ if(len > n->maxmtu)
+ len = n->maxmtu;
+ if(n->minmtu < len)
+ n->minmtu = len;
+ }
+}
+
+static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
+ if(level == 0) {
+ memcpy(dest, source, len);
+ return len;
+ } else if(level == 10) {
+#ifdef HAVE_LZO
lzo_uint lzolen = MAXSIZE;
lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
return lzolen;
+#else
+ return -1;
+#endif
} else if(level < 10) {
+#ifdef HAVE_ZLIB
unsigned long destlen = MAXSIZE;
if(compress2(dest, &destlen, source, len, level) == Z_OK)
return destlen;
else
+#endif
return -1;
} else {
+#ifdef HAVE_LZO
lzo_uint lzolen = MAXSIZE;
lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem);
return lzolen;
+#else
+ return -1;
+#endif
}
return -1;
}
-static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
-{
- if(level > 9) {
+static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
+ if(level == 0) {
+ memcpy(dest, source, len);
+ return len;
+ } else if(level > 9) {
+#ifdef HAVE_LZO
lzo_uint lzolen = MAXSIZE;
if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK)
return lzolen;
else
+#endif
return -1;
- } else {
+ }
+#ifdef HAVE_ZLIB
+ else {
unsigned long destlen = MAXSIZE;
if(uncompress(dest, &destlen, source, len) == Z_OK)
return destlen;
else
return -1;
}
-
+#endif
+
return -1;
}
/* VPN packet I/O */
-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)"),
+static void receive_packet(node_t *n, vpn_packet_t *packet) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Received packet of %d bytes from %s (%s)",
packet->len, n->name, n->hostname);
- route_incoming(n, packet);
+ n->in_packets++;
+ n->in_bytes += packet->len;
+
+ route(n, packet);
}
-static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
+static bool try_mac(node_t *n, const vpn_packet_t *inpkt) {
+ if(!digest_active(&n->indigest) || inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest))
+ return false;
+
+ return digest_verify(&n->indigest, &inpkt->seqno, inpkt->len - n->indigest.maclength, (const char *)&inpkt->seqno + inpkt->len - n->indigest.maclength);
+}
+
+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;
- char hmac[EVP_MAX_MD_SIZE];
- int i;
+ size_t outlen;
- cp();
+ if(!cipher_active(&n->incipher)) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet",
+ n->name, n->hostname);
+ return;
+ }
- /* Check the message authentication code */
+ /* Check packet length */
+
+ if(inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest)) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got too short packet from %s (%s)",
+ n->name, n->hostname);
+ return;
+ }
- if(myself->digest && myself->maclength) {
- inpkt->len -= myself->maclength;
- HMAC(myself->digest, myself->key, myself->keylength,
- (char *) &inpkt->seqno, inpkt->len, hmac, NULL);
+ /* Check the message authentication code */
- 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);
+ if(digest_active(&n->indigest)) {
+ inpkt->len -= n->indigest.maclength;
+ if(!digest_verify(&n->indigest, &inpkt->seqno, inpkt->len, (const char *)&inpkt->seqno + inpkt->len)) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got unauthenticated packet from %s (%s)", n->name, n->hostname);
return;
}
}
-
/* Decrypt the packet */
- if(myself->cipher) {
+ if(cipher_active(&n->incipher)) {
outpkt = pkt[nextpkt++];
+ outlen = MAXSIZE;
-// EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key,
-// myself->key + myself->cipher->key_len);
- 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);
+ if(!cipher_decrypt(&n->incipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error decrypting packet from %s (%s)", n->name, n->hostname);
+ return;
+ }
- outpkt->len = outlen + outpad;
+ outpkt->len = outlen;
inpkt = outpkt;
}
/* Check the sequence number */
- inpkt->len -= sizeof(inpkt->seqno);
+ inpkt->len -= sizeof inpkt->seqno;
inpkt->seqno = ntohl(inpkt->seqno);
- if(inpkt->seqno != n->received_seqno + 1) {
- if(inpkt->seqno >= n->received_seqno + sizeof(n->late) * 8) {
- logger(LOG_WARNING, _("Lost %d packets from %s (%s)"),
- inpkt->seqno - n->received_seqno - 1, n->name, n->hostname);
-
- 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))) {
- 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;
+ if(replaywin) {
+ if(inpkt->seqno != n->received_seqno + 1) {
+ if(inpkt->seqno >= n->received_seqno + replaywin * 8) {
+ if(n->farfuture++ < replaywin >> 2) {
+ logger(LOG_WARNING, "Packet from %s (%s) is %d seqs in the future, dropped (%u)",
+ n->name, n->hostname, inpkt->seqno - n->received_seqno - 1, n->farfuture);
+ return;
+ }
+ logger(LOG_WARNING, "Lost %d packets from %s (%s)",
+ inpkt->seqno - n->received_seqno - 1, n->name, n->hostname);
+ memset(n->late, 0, replaywin);
+ } else if (inpkt->seqno <= n->received_seqno) {
+ if((n->received_seqno >= replaywin * 8 && inpkt->seqno <= n->received_seqno - replaywin * 8) || !(n->late[(inpkt->seqno / 8) % replaywin] & (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);
+ return;
+ }
+ } else {
+ for(int i = n->received_seqno + 1; i < inpkt->seqno; i++)
+ n->late[(i / 8) % replaywin] |= 1 << i % 8;
+ }
}
+
+ n->farfuture = 0;
+ n->late[(inpkt->seqno / 8) % replaywin] &= ~(1 << inpkt->seqno % 8);
}
-
- n->received_seqno = inpkt->seqno;
- n->late[(n->received_seqno / 8) % sizeof(n->late)] &= ~(1 << n->received_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 */
- if(myself->compression) {
+ length_t origlen = inpkt->len;
+
+ if(n->incompression) {
outpkt = pkt[nextpkt++];
- if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, myself->compression)) < 0) {
- logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"),
- n->name, n->hostname);
+ if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, n->incompression)) < 0) {
+ ifdebug(TRAFFIC) logger(LOG_ERR, "Error while uncompressing packet from %s (%s)",
+ n->name, n->hostname);
return;
}
inpkt = outpkt;
+
+ origlen -= MTU/64 + 20;
}
- receive_packet(n, inpkt);
+ inpkt->priority = 0;
+
+ if(!inpkt->data[12] && !inpkt->data[13])
+ mtu_probe_h(n, inpkt, origlen);
+ else
+ receive_packet(n, inpkt);
}
-void receive_tcppacket(connection_t *c, char *buffer, int len)
-{
+void receive_tcppacket(connection_t *c, const char *buffer, int len) {
vpn_packet_t outpkt;
- cp();
-
outpkt.len = len;
+ if(c->options & OPTION_TCPONLY)
+ outpkt.priority = 0;
+ else
+ outpkt.priority = -1;
memcpy(outpkt.data, buffer, len);
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;
- int outlen, outpad;
- vpn_packet_t *copy;
+ int origlen = origpkt->len;
+ size_t outlen;
+#if defined(SOL_IP) && defined(IP_TOS)
static int priority = 0;
- int origpriority;
+ int origpriority = origpkt->priority;
+#endif
int sock;
- cp();
+ if(!n->status.reachable) {
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
+ return;
+ }
/* Make sure we have a valid key */
if(!n->status.validkey) {
+ time_t now = time(NULL);
+
ifdebug(TRAFFIC) logger(LOG_INFO,
- _("No valid key known yet for %s (%s), queueing packet"),
+ "No valid key known yet for %s (%s), forwarding via TCP",
n->name, n->hostname);
- /* Since packet is on the stack of handle_tap_input(), we have to make a copy of it first. */
-
- copy = xmalloc(sizeof(vpn_packet_t));
- memcpy(copy, inpkt, sizeof(vpn_packet_t));
+ if(n->last_req_key + 10 <= now) {
+ send_req_key(n);
+ n->last_req_key = now;
+ }
- list_insert_tail(n->queue, copy);
+ send_tcppacket(n->nexthop->connection, origpkt);
- if(n->queue->count > MAXQUEUELENGTH)
- list_delete_head(n->queue);
+ return;
+ }
- if(!n->status.waitingforkey)
- send_req_key(n->nexthop->connection, myself, n);
+ if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (inpkt->data[12] | inpkt->data[13])) {
+ ifdebug(TRAFFIC) logger(LOG_INFO,
+ "Packet for %s (%s) larger than minimum MTU, forwarding via %s",
+ n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP");
- n->status.waitingforkey = true;
+ if(n != n->nexthop)
+ send_packet(n->nexthop, origpkt);
+ else
+ send_tcppacket(n->nexthop->connection, origpkt);
return;
}
- origlen = inpkt->len;
- origpriority = inpkt->priority;
-
/* Compress the packet */
- if(n->compression) {
+ if(n->outcompression) {
outpkt = pkt[nextpkt++];
- if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->compression)) < 0) {
- logger(LOG_ERR, _("Error while compressing packet to %s (%s)"),
+ if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->outcompression)) < 0) {
+ ifdebug(TRAFFIC) logger(LOG_ERR, "Error while compressing packet to %s (%s)",
n->name, n->hostname);
return;
}
/* Add sequence number */
inpkt->seqno = htonl(++(n->sent_seqno));
- inpkt->len += sizeof(inpkt->seqno);
+ inpkt->len += sizeof inpkt->seqno;
/* Encrypt the packet */
- if(n->cipher) {
+ if(cipher_active(&n->outcipher)) {
outpkt = pkt[nextpkt++];
+ outlen = MAXSIZE;
-// EVP_EncryptInit_ex(&packet_ctx, n->cipher, NULL, n->key, n->key + n->cipher->key_len);
- 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);
+ if(!cipher_encrypt(&n->outcipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
+ ifdebug(TRAFFIC) logger(LOG_ERR, "Error while encrypting packet to %s (%s)", n->name, n->hostname);
+ goto end;
+ }
- outpkt->len = outlen + outpad;
+ outpkt->len = outlen;
inpkt = outpkt;
}
/* 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);
- inpkt->len += n->maclength;
+ if(digest_active(&n->outdigest)) {
+ digest_create(&n->outdigest, &inpkt->seqno, inpkt->len, (char *)&inpkt->seqno + inpkt->len);
+ inpkt->len += digest_length(&n->outdigest);
}
/* Determine which socket we have to use */
if(priorityinheritance && origpriority != priority
&& listen_socket[sock].sa.sa.sa_family == AF_INET) {
priority = origpriority;
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority);
- if(setsockopt(listen_socket[sock].udp, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */
- logger(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt",
- strerror(errno));
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting outgoing packet priority to %d", priority);
+ if(setsockopt(listen_socket[sock].udp, SOL_IP, IP_TOS, &priority, sizeof priority)) /* SO_PRIORITY doesn't seem to work */
+ logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno));
}
#endif
- if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) {
- logger(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name,
- n->hostname, strerror(errno));
- return;
+ 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));
}
- inpkt->len = origlen;
+end:
+ 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(node_t *n, vpn_packet_t *packet) {
node_t *via;
- cp();
-
- ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
- packet->len, n->name, n->hostname);
-
if(n == myself) {
- ifdebug(TRAFFIC) logger(LOG_NOTICE, _("Packet is looping back to us!"));
+ 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"),
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Node %s (%s) is not reachable",
n->name, n->hostname);
return;
}
- via = (n->via == myself) ? n->nexthop : n->via;
+ 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_ERR, _("Sending packet to %s via %s (%s)"),
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Sending packet to %s via %s (%s)",
n->name, via->name, n->via->hostname);
- if((myself->options | via->options) & OPTION_TCPONLY) {
+ if(packet->priority == -1 || ((myself->options | via->options) & OPTION_TCPONLY)) {
if(!send_tcppacket(via->connection, packet))
terminate_connection(via->connection, true);
} else
/* Broadcast a packet using the minimum spanning tree */
-void broadcast_packet(const node_t *from, vpn_packet_t *packet)
-{
- avl_node_t *node;
+void broadcast_packet(const node_t *from, vpn_packet_t *packet) {
+ splay_node_t *node;
connection_t *c;
- cp();
-
- ifdebug(TRAFFIC) logger(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
+ 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 = (connection_t *) node->data;
+ c = node->data;
if(c->status.active && c->status.mst && c != from->nexthop->connection)
send_packet(c->node, packet);
}
}
-void flush_queue(node_t *n)
-{
- list_node_t *node, *next;
-
- cp();
+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;
+ }
- ifdebug(TRAFFIC) logger(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
+ if(!try_mac(e->to, pkt))
+ continue;
- for(node = n->queue->head; node; node = next) {
- next = node->next;
- send_udppacket(n, (vpn_packet_t *) node->data);
- list_delete_node(n->queue, node);
+ n = e->to;
+ break;
}
+
+ if(hard)
+ last_hard_try = now;
+
+ return n;
}
-void handle_incoming_vpn_data(int sock)
-{
+void handle_incoming_vpn_data(int sock, short events, void *data) {
vpn_packet_t pkt;
- int x, l = sizeof(x);
char *hostname;
sockaddr_t from;
- socklen_t fromlen = sizeof(from);
+ socklen_t fromlen = sizeof from;
node_t *n;
+ int len;
- cp();
-
- if(getsockopt(sock, SOL_SOCKET, SO_ERROR, &x, &l) < 0) {
- logger(LOG_ERR, _("This is a bug: %s:%d: %d:%s"),
- __FILE__, __LINE__, sock, strerror(errno));
- cp_trace();
- exit(1);
- }
+ len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
- if(x) {
- logger(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
+ if(len <= 0 || len > MAXSIZE) {
+ if(!sockwouldblock(sockerrno))
+ logger(LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno));
return;
}
- pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
-
- if(pkt.len <= 0) {
- logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
- return;
- }
+ pkt.len = len;
sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */
n = lookup_node_udp(&from);
if(!n) {
- hostname = sockaddr2hostname(&from);
- logger(LOG_WARNING, _("Received UDP packet from unknown source %s"),
- hostname);
- free(hostname);
- return;
+ 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;
}
- if(n->connection)
- n->connection->last_ping_time = now;
-
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);
+ }
+}