X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet_packet.c;h=ac63f62803e53cf11a6b5568c54ba5cc9995c08a;hb=742f7bb04e72d93f2c4a858534144a599b3fc14d;hp=cbdc15cfebc98ea77156017b65db2c4beb3d472a;hpb=19be9cf7150858311f7898fa3fb525d692d02f64;p=tinc

diff --git a/src/net_packet.c b/src/net_packet.c
index cbdc15cf..ac63f628 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -252,6 +252,9 @@ static void receive_packet(node_t *n, vpn_packet_t *packet) {
 }
 
 static bool try_mac(node_t *n, const vpn_packet_t *inpkt) {
+	if(n->status.sptps)
+		return sptps_verify_datagram(&n->sptps, (char *)&inpkt->seqno, inpkt->len);
+
 	if(!digest_active(&n->indigest) || inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest))
 		return false;
 
@@ -265,6 +268,11 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
 	vpn_packet_t *outpkt = pkt[0];
 	size_t outlen;
 
+	if(n->status.sptps) {
+		sptps_receive_data(&n->sptps, (char *)&inpkt->seqno, inpkt->len);
+		return;
+	}
+
 	if(!cipher_active(&n->incipher)) {
 		logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet",
 					n->name, n->hostname);
@@ -380,6 +388,42 @@ void receive_tcppacket(connection_t *c, const char *buffer, int len) {
 	receive_packet(c->node, &outpkt);
 }
 
+static void send_sptps_packet(node_t *n, vpn_packet_t *origpkt) {
+	if(n->status.sptps) {
+		uint8_t type = 0;
+		int offset = 0;
+
+		if(!(origpkt->data[12] | origpkt->data[13])) {
+			sptps_send_record(&n->sptps, PKT_PROBE, (char *)origpkt->data, origpkt->len);
+			return;
+		}
+
+		if(routing_mode == RMODE_ROUTER)
+			offset = 14;
+		else
+			type = PKT_MAC;
+
+		if(origpkt->len < offset)
+			return;
+
+		vpn_packet_t outpkt;
+
+		if(n->outcompression) {
+			int len = compress_packet(outpkt.data + offset, origpkt->data + offset, origpkt->len - offset, n->outcompression);
+			if(len < 0) {
+				logger(DEBUG_TRAFFIC, LOG_ERR, "Error while compressing packet to %s (%s)", n->name, n->hostname);
+			} else if(len < origpkt->len - offset) {
+				outpkt.len = len + offset;
+				origpkt = &outpkt;
+				type |= PKT_COMPRESSED;
+			}
+		}
+
+		sptps_send_record(&n->sptps, type, (char *)origpkt->data + offset, origpkt->len - offset);
+		return;
+	}
+}
+
 static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 	vpn_packet_t pkt1, pkt2;
 	vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
@@ -390,14 +434,17 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 	size_t outlen;
 #if defined(SOL_IP) && defined(IP_TOS)
 	static int priority = 0;
-	int origpriority = origpkt->priority;
 #endif
+	int origpriority = origpkt->priority;
 
 	if(!n->status.reachable) {
 		logger(DEBUG_TRAFFIC, LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
 		return;
 	}
 
+	if(n->status.sptps)
+		return send_sptps_packet(n, origpkt);
+
 	/* Make sure we have a valid key */
 
 	if(!n->status.validkey) {
@@ -531,6 +578,117 @@ end:
 	origpkt->len = origlen;
 }
 
+bool send_sptps_data(void *handle, uint8_t type, const char *data, size_t len) {
+	node_t *to = handle;
+
+	if(type >= SPTPS_HANDSHAKE || ((myself->options | to->options) & OPTION_TCPONLY)) {
+		char buf[len * 4 / 3 + 5];
+		b64encode(data, buf, len);
+		if(!to->status.validkey)
+			return send_request(to->nexthop->connection, "%d %s %s %s -1 -1 -1 %d", ANS_KEY, myself->name, to->name, buf, myself->incompression);
+		else
+			return send_request(to->nexthop->connection, "%d %s %s %d %s", REQ_KEY, myself->name, to->name, REQ_SPTPS, buf);
+	}
+
+	/* Send the packet */
+
+	struct sockaddr *sa;
+	socklen_t sl;
+	int sock;
+
+	sa = &(to->address.sa);
+	sl = SALEN(to->address.sa);
+	sock = to->sock;
+
+	if(sendto(listen_socket[sock].udp, data, len, 0, sa, sl) < 0 && !sockwouldblock(sockerrno)) {
+		if(sockmsgsize(sockerrno)) {
+			if(to->maxmtu >= len)
+				to->maxmtu = len - 1;
+			if(to->mtu >= len)
+				to->mtu = len - 1;
+		} else {
+			logger(DEBUG_TRAFFIC, LOG_WARNING, "Error sending UDP SPTPS packet to %s (%s): %s", to->name, to->hostname, sockstrerror(sockerrno));
+			return false;
+		}
+	}
+
+	return true;
+}
+
+bool receive_sptps_record(void *handle, uint8_t type, const char *data, uint16_t len) {
+	node_t *from = handle;
+
+	if(type == SPTPS_HANDSHAKE) {
+		from->status.validkey = true;
+		logger(DEBUG_META, LOG_INFO, "SPTPS key exchange with %s (%s) succesful", from->name, from->hostname);
+		return true;
+	}
+
+	if(len > MTU) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Packet from %s (%s) larger than maximum supported size (%d > %d)", from->name, from->hostname, len, MTU);
+		return false;
+	}
+
+	vpn_packet_t inpkt;
+
+	if(type == PKT_PROBE) {
+		inpkt.len = len;
+		memcpy(inpkt.data, data, len);
+		mtu_probe_h(from, &inpkt, len);
+		return true;
+	}
+
+	if(type & ~(PKT_COMPRESSED | PKT_MAC)) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Unexpected SPTPS record type %d len %d from %s (%s)", type, len, from->name, from->hostname);
+		return false;
+	}
+
+	/* Check if we have the headers we need */
+	if(routing_mode != RMODE_ROUTER && !(type & PKT_MAC)) {
+		logger(DEBUG_TRAFFIC, LOG_ERR, "Received packet from %s (%s) without MAC header (maybe Mode is not set correctly)", from->name, from->hostname);
+		return false;
+	} else if(routing_mode == RMODE_ROUTER && (type & PKT_MAC)) {
+		logger(DEBUG_TRAFFIC, LOG_WARNING, "Received packet from %s (%s) with MAC header (maybe Mode is not set correctly)", from->name, from->hostname);
+	}
+
+	int offset = (type & PKT_MAC) ? 0 : 14;
+	if(type & PKT_COMPRESSED) {
+		len = uncompress_packet(inpkt.data + offset, (const uint8_t *)data, len, from->incompression);
+		if(len < 0) {
+			return false;
+		} else {
+			inpkt.len = len + offset;
+		}
+		if(inpkt.len > MAXSIZE)
+			abort();
+	} else {
+		memcpy(inpkt.data + offset, data, len);
+		inpkt.len = len + offset;
+	}
+
+	/* Generate the Ethernet packet type if necessary */
+	if(offset) {
+		switch(inpkt.data[14] >> 4) {
+			case 4:
+				inpkt.data[12] = 0x08;
+				inpkt.data[13] = 0x00;
+				break;
+			case 6:
+				inpkt.data[12] = 0x86;
+				inpkt.data[13] = 0xDD;
+				break;
+			default:
+				logger(DEBUG_TRAFFIC, LOG_ERR,
+						   "Unknown IP version %d while reading packet from %s (%s)",
+						   inpkt.data[14] >> 4, from->name, from->hostname);
+				return false;
+		}
+	}
+
+	receive_packet(from, &inpkt);
+	return true;
+}
+
 /*
   send a packet to the given vpn ip.
 */
@@ -558,6 +716,11 @@ void send_packet(node_t *n, vpn_packet_t *packet) {
 	n->out_packets++;
 	n->out_bytes += packet->len;
 
+	if(n->status.sptps) {
+		send_sptps_packet(n, packet);
+		return;
+	}
+
 	via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via;
 
 	if(via != n)