/*
net_packet.c -- Handles in- and outgoing VPN packets
- Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
+ Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
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
n->mtuprobes++;
if(!n->status.reachable || !n->status.validkey) {
- logger(mesh, MESHLINK_INFO, "Trying to send MTU probe to unreachable or rekeying node %s (%s)", n->name, n->hostname);
+ logger(mesh, MESHLINK_INFO, "Trying to send MTU probe to unreachable or rekeying node %s", n->name);
n->mtuprobes = 0;
return;
}
goto end;
}
- logger(mesh, MESHLINK_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname);
+ logger(mesh, MESHLINK_INFO, "%s did not respond to UDP ping, restarting PMTU discovery", n->name);
n->status.udp_confirmed = false;
n->mtuprobes = 1;
n->minmtu = 0;
}
if(n->mtuprobes >= 10 && n->mtuprobes < 32 && !n->minmtu) {
- logger(mesh, MESHLINK_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname);
+ logger(mesh, MESHLINK_INFO, "No response to MTU probes from %s", n->name);
n->mtuprobes = 31;
}
else
n->maxmtu = n->minmtu;
n->mtu = n->minmtu;
- logger(mesh, MESHLINK_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes);
+ logger(mesh, MESHLINK_INFO, "Fixing MTU of %s to %d after %d probes", n->name, n->mtu, n->mtuprobes);
n->mtuprobes = 31;
}
packet.len = len;
n->status.broadcast = i >= 4 && n->mtuprobes <= 10 && n->prevedge;
- logger(mesh, MESHLINK_DEBUG, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname);
+ logger(mesh, MESHLINK_DEBUG, "Sending MTU probe length %d to %s", len, n->name);
send_udppacket(mesh, n, &packet);
}
}
static void mtu_probe_h(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *packet, uint16_t len) {
- logger(mesh, MESHLINK_DEBUG, "Got MTU probe length %d from %s (%s)", packet->len, n->name, n->hostname);
+ logger(mesh, MESHLINK_DEBUG, "Got MTU probe length %d from %s", packet->len, n->name);
if(!packet->data[0]) {
/* It's a probe request, send back a reply */
if(n->mtuprobes > 30) {
if(len == n->maxmtu + 8) {
- logger(mesh, MESHLINK_INFO, "Increase in PMTU to %s (%s) detected, restarting PMTU discovery", n->name, n->hostname);
+ logger(mesh, MESHLINK_INFO, "Increase in PMTU to %s detected, restarting PMTU discovery", n->name);
n->maxmtu = MTU;
n->mtuprobes = 10;
return;
}
}
-static uint16_t compress_packet(uint8_t *dest, const uint8_t *source, uint16_t len, int level) {
- abort();
-}
-
-static uint16_t uncompress_packet(uint8_t *dest, const uint8_t *source, uint16_t len, int level) {
- abort();
-}
-
/* VPN packet I/O */
static void receive_packet(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *packet) {
- logger(mesh, MESHLINK_DEBUG, "Received packet of %d bytes from %s (%s)",
- packet->len, n->name, n->hostname);
+ logger(mesh, MESHLINK_DEBUG, "Received packet of %d bytes from %s", packet->len, n->name);
if(n->status.blacklisted)
logger(mesh, MESHLINK_WARNING, "Dropping packet from blacklisted node %s", n->name);
}
static bool try_mac(meshlink_handle_t *mesh, node_t *n, const vpn_packet_t *inpkt) {
+ (void)mesh;
return sptps_verify_datagram(&n->sptps, inpkt->data, inpkt->len);
}
static void receive_udppacket(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *inpkt) {
if(!n->sptps.state) {
if(!n->status.waitingforkey) {
- logger(mesh, MESHLINK_DEBUG, "Got packet from %s (%s) but we haven't exchanged keys yet", n->name, n->hostname);
+ logger(mesh, MESHLINK_DEBUG, "Got packet from %s but we haven't exchanged keys yet", n->name);
send_req_key(mesh, n);
} else
- logger(mesh, MESHLINK_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", n->name, n->hostname);
+ logger(mesh, MESHLINK_DEBUG, "Got packet from %s but he hasn't got our key yet", n->name);
return;
}
sptps_receive_data(&n->sptps, inpkt->data, inpkt->len);
}
-void receive_tcppacket(meshlink_handle_t *mesh, connection_t *c, const char *buffer, int len) {
- vpn_packet_t outpkt;
-
- if(len > sizeof(outpkt).data)
- return;
-
- outpkt.len = len;
- outpkt.tcp = true;
- memcpy(outpkt.data, buffer, len);
-
- receive_packet(mesh, c->node, &outpkt);
-}
-
static void send_sptps_packet(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *origpkt) {
if(!n->status.validkey) {
- logger(mesh, MESHLINK_INFO, "No valid key known yet for %s (%s)", n->name, n->hostname);
+ logger(mesh, MESHLINK_INFO, "No valid key known yet for %s", n->name);
if(!n->status.waitingforkey)
send_req_key(mesh, n);
else if(n->last_req_key + 10 < mesh->loop.now.tv_sec) {
return;
}
- vpn_packet_t outpkt;
-
if(n->outcompression) {
- int len = compress_packet(outpkt.data, origpkt->data, origpkt->len, n->outcompression);
- if(len < 0)
- logger(mesh, MESHLINK_ERROR, "Error while compressing packet to %s (%s)", n->name, n->hostname);
- else if(len < origpkt->len) {
- outpkt.len = len;
- origpkt = &outpkt;
- type |= PKT_COMPRESSED;
- }
+ logger(mesh, MESHLINK_ERROR, "Error while compressing packet to %s", n->name);
+ return;
}
sptps_send_record(&n->sptps, type, origpkt->data, origpkt->len);
static void send_udppacket(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *origpkt) {
if(!n->status.reachable) {
- logger(mesh, MESHLINK_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
+ logger(mesh, MESHLINK_INFO, "Trying to send UDP packet to unreachable node %s", n->name);
return;
}
if(to->mtu >= len)
to->mtu = len - 1;
} else {
- logger(mesh, MESHLINK_WARNING, "Error sending UDP SPTPS packet to %s (%s): %s", to->name, to->hostname, sockstrerror(sockerrno));
+ logger(mesh, MESHLINK_WARNING, "Error sending UDP SPTPS packet to %s: %s", to->name, sockstrerror(sockerrno));
return false;
}
}
if(type == SPTPS_HANDSHAKE) {
if(!from->status.validkey) {
+ logger(mesh, MESHLINK_INFO, "SPTPS key exchange with %s succesful", from->name);
from->status.validkey = true;
from->status.waitingforkey = false;
- logger(mesh, MESHLINK_INFO, "SPTPS key exchange with %s (%s) succesful", from->name, from->hostname);
+ if(from->utcp)
+ utcp_reset_timers(from->utcp);
}
return true;
}
if(len > MTU) {
- logger(mesh, MESHLINK_ERROR, "Packet from %s (%s) larger than maximum supported size (%d > %d)", from->name, from->hostname, len, MTU);
+ logger(mesh, MESHLINK_ERROR, "Packet from %s larger than maximum supported size (%d > %d)", from->name, len, MTU);
return false;
}
inpkt.probe = false;
if(type & ~(PKT_COMPRESSED)) {
- logger(mesh, MESHLINK_ERROR, "Unexpected SPTPS record type %d len %d from %s (%s)", type, len, from->name, from->hostname);
+ logger(mesh, MESHLINK_ERROR, "Unexpected SPTPS record type %d len %d from %s", type, len, from->name);
return false;
}
if(type & PKT_COMPRESSED) {
- uint16_t ulen = uncompress_packet(inpkt.data, (const uint8_t *)data, len, from->incompression);
- if(ulen < 0)
- return false;
- else
- inpkt.len = ulen;
- if(inpkt.len > MAXSIZE)
- abort();
- } else {
- memcpy(inpkt.data, data, len);
- inpkt.len = len;
+ logger(mesh, MESHLINK_ERROR, "Error while decompressing packet from %s", from->name);
+ return false;
}
+ memcpy(inpkt.data, data, len); // TODO: get rid of memcpy
+ inpkt.len = len;
+
receive_packet(mesh, from, &inpkt);
return true;
}
return;
}
- logger(mesh, MESHLINK_DEBUG, "Sending packet of %d bytes to %s (%s)",
- packet->len, n->name, n->hostname);
+ logger(mesh, MESHLINK_DEBUG, "Sending packet of %d bytes to %s", packet->len, n->name);
if(!n->status.reachable) {
- logger(mesh, MESHLINK_WARNING, "Node %s (%s) is not reachable",
- n->name, n->hostname);
+ logger(mesh, MESHLINK_WARNING, "Node %s is not reachable", n->name);
return;
}
if(from != mesh->self)
send_packet(mesh, mesh->self, packet);
- logger(mesh, MESHLINK_INFO, "Broadcasting packet of %d bytes from %s (%s)",
- packet->len, from->name, from->hostname);
+ logger(mesh, MESHLINK_INFO, "Broadcasting packet of %d bytes from %s", packet->len, from->name);
for list_each(connection_t, c, mesh->connections)
if(c->status.active && c->status.mst && c != from->nexthop->connection)
}
void handle_incoming_vpn_data(event_loop_t *loop, void *data, int flags) {
+ (void)flags;
meshlink_handle_t *mesh = loop->data;
listen_socket_t *ls = data;
vpn_packet_t pkt;
char *hostname;
- sockaddr_t from = {{0}};
+ sockaddr_t from = {};
socklen_t fromlen = sizeof(from);
node_t *n;
int len;
projects / meshlink / blobdiff