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.
+ 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"
#define MAX_SEQNO 1073741824
-void send_mtu_probe(node_t *n)
-{
+// 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
+
+void send_mtu_probe(node_t *n) {
vpn_packet_t packet;
int len, i;
+ int timeout = 1;
- cp();
-
n->mtuprobes++;
n->mtuevent = NULL;
- if(!n->status.reachable) {
- logger(LOG_DEBUG, _("Trying to send MTU probe to unreachable node %s (%s)"), n->name, n->hostname);
+ 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) {
+ 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->minmtu) {
- ifdebug(TRAFFIC) logger(LOG_INFO, _("No response to MTU probes from %s (%s)"), n->name, n->hostname);
+ ifdebug(TRAFFIC) logger(LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname);
+ n->mtuprobes = 0;
return;
}
+ if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) {
+ 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->mtuprobes >= 30 || n->minmtu >= n->maxmtu) {
- 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);
- return;
- }
+ if(n->maxmtu <= n->minmtu)
+ len = n->maxmtu;
+ else
+ len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
- len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
if(len < 64)
len = 64;
packet.len = len;
packet.priority = 0;
- ifdebug(TRAFFIC) logger(LOG_INFO, _("Sending MTU probe length %d to %s (%s)"), len, n->name, n->hostname);
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname);
send_udppacket(n, &packet);
}
+end:
n->mtuevent = new_event();
n->mtuevent->handler = (event_handler_t)send_mtu_probe;
n->mtuevent->data = n;
- n->mtuevent->time = now + 1;
+ n->mtuevent->time = now + timeout;
event_add(n->mtuevent);
}
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);
+ 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_packet(n, packet);
+ send_udppacket(n, packet);
} else {
+ if(len > n->maxmtu)
+ len = n->maxmtu;
if(n->minmtu < len)
n->minmtu = len;
+ if(n->mtuprobes > 30)
+ n->mtuprobes = 30;
}
}
-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)
-{
- 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(n, packet);
}
-static bool try_mac(const node_t *n, const vpn_packet_t *inpkt)
-{
+static bool try_mac(const node_t *n, const vpn_packet_t *inpkt) {
unsigned char hmac[EVP_MAX_MD_SIZE];
if(!n->indigest || !n->inmaclength || !n->inkey || inpkt->len < sizeof inpkt->seqno + n->inmaclength)
return !memcmp(hmac, (char *) &inpkt->seqno + inpkt->len - n->inmaclength, n->inmaclength);
}
-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;
unsigned char hmac[EVP_MAX_MD_SIZE];
int i;
- cp();
-
if(!n->inkey) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got packet from %s (%s) but he hasn't got our key yet"),
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet",
n->name, n->hostname);
return;
}
/* Check packet length */
if(inpkt->len < sizeof(inpkt->seqno) + n->inmaclength) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"),
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got too short packet from %s (%s)",
n->name, n->hostname);
return;
}
(unsigned char *) &inpkt->seqno, inpkt->len, (unsigned char *)hmac, NULL);
if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, n->inmaclength)) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"),
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got unauthenticated packet from %s (%s)",
n->name, n->hostname);
return;
}
|| !EVP_DecryptUpdate(&n->inctx, (unsigned char *) &outpkt->seqno, &outlen,
(unsigned char *) &inpkt->seqno, inpkt->len)
|| !EVP_DecryptFinal_ex(&n->inctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"),
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error decrypting packet from %s (%s): %s",
n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
return;
}
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)"),
+ 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((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"),
+ 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;
}
outpkt = pkt[nextpkt++];
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)"),
+ ifdebug(TRAFFIC) logger(LOG_ERR, "Error while uncompressing packet from %s (%s)",
n->name, n->hostname);
return;
}
inpkt->priority = 0;
- if(n->connection)
- n->connection->last_ping_time = now;
-
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, char *buffer, int len) {
vpn_packet_t outpkt;
- cp();
-
outpkt.len = len;
if(c->options & OPTION_TCPONLY)
outpkt.priority = 0;
receive_packet(c->node, &outpkt);
}
-static void send_udppacket(node_t *n, vpn_packet_t *origpkt)
-{
+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 origpriority;
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);
+ ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
return;
}
if(!n->status.validkey) {
ifdebug(TRAFFIC) logger(LOG_INFO,
- _("No valid key known yet for %s (%s), forwarding via TCP"),
+ "No valid key known yet for %s (%s), forwarding via TCP",
n->name, n->hostname);
if(!n->status.waitingforkey)
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 TCP"),
+ "Packet for %s (%s) larger than minimum MTU, forwarding via TCP",
n->name, n->hostname);
send_tcppacket(n->nexthop->connection, origpkt);
outpkt = pkt[nextpkt++];
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)"),
+ ifdebug(TRAFFIC) logger(LOG_ERR, "Error while compressing packet to %s (%s)",
n->name, n->hostname);
return;
}
|| !EVP_EncryptUpdate(&n->outctx, (unsigned char *) &outpkt->seqno, &outlen,
(unsigned char *) &inpkt->seqno, inpkt->len)
|| !EVP_EncryptFinal_ex(&n->outctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
- ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"),
+ 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;
}
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);
+ 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));
+ logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno));
}
#endif
if(n->mtu >= origlen)
n->mtu = origlen - 1;
} else
- logger(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name, n->hostname, strerror(errno));
+ logger(LOG_ERR, "Error sending packet to %s (%s): %s", n->name, n->hostname, strerror(errno));
}
end:
/*
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();
-
if(n == myself) {
if(overwrite_mac)
memcpy(packet->data, mymac.x, ETH_ALEN);
return;
}
- ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
+ 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 = (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)"),
+ 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)) {
/* 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;
- 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) {
avl_node_t *node;
edge_t *e;
node_t *n = NULL;
+ static time_t last_hard_try = 0;
for(node = edge_weight_tree->head; node; node = node->next) {
e = node->data;
- if(sockaddrcmp_noport(from, &e->address))
- continue;
+ if(sockaddrcmp_noport(from, &e->address)) {
+ if(last_hard_try == now)
+ continue;
+ last_hard_try = now;
+ }
if(!n)
n = e->to;
return n;
}
-void handle_incoming_vpn_data(int sock)
-{
+void handle_incoming_vpn_data(int sock) {
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);
if(pkt.len < 0) {
if(errno != EAGAIN && errno != EINTR)
- logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
+ logger(LOG_ERR, "Receiving packet failed: %s", strerror(errno));
return;
}
update_node_udp(n, &from);
else ifdebug(PROTOCOL) {
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;
}
projects / oweals / tinc.git / blobdiff