X-Git-Url: http://git.meshlink.io/?p=utcp;a=blobdiff_plain;f=utcp_priv.h;h=6c5c1f85f052016999b800534e398a21884eec17;hp=6c1386307e691ca79babe93f66b62108ada9a177;hb=275129c9d08b2d29529b2f9d039198168aeb52a7;hpb=4368d8c9956242f0bdc00d43ebf32a72332522c1

diff --git a/utcp_priv.h b/utcp_priv.h
index 6c13863..6c5c1f8 100644
--- a/utcp_priv.h
+++ b/utcp_priv.h
@@ -30,8 +30,24 @@
 #define FIN 4
 #define RST 8
 
+#define AUX_INIT 1
+#define AUX_FRAME 2
+#define AUX_SAK 3
+#define AUX_TIMESTAMP 4
+
+#define NSACKS 4
 #define DEFAULT_SNDBUFSIZE 4096
 #define DEFAULT_MAXSNDBUFSIZE 131072
+#define DEFAULT_RCVBUFSIZE 0
+#define DEFAULT_MAXRCVBUFSIZE 131072
+
+#define DEFAULT_MTU 1000
+
+#define USEC_PER_SEC 1000000
+#define DEFAULT_USER_TIMEOUT 60 // sec
+#define CLOCK_GRANULARITY 1000 // usec
+#define START_RTO 1000000 // usec
+#define MAX_RTO 3000000 // usec
 
 struct hdr {
 	uint16_t src; // Source port
@@ -57,7 +73,7 @@ enum state {
 	TIME_WAIT
 };
 
-static const char *strstate[] = {
+static const char *strstate[] __attribute__((unused)) = {
 	[CLOSED] = "CLOSED",
 	[LISTEN] = "LISTEN",
 	[SYN_SENT] = "SYN_SENT",
@@ -71,25 +87,44 @@ static const char *strstate[] = {
 	[TIME_WAIT] = "TIME_WAIT"
 };
 
+struct buffer {
+	char *data;
+	uint32_t used;
+	uint32_t size;
+	uint32_t maxsize;
+};
+
+struct sack {
+	uint32_t offset;
+	uint32_t len;
+};
+
 struct utcp_connection {
 	void *priv;
 	struct utcp *utcp;
+	uint32_t flags;
+
 	bool reapable;
 
-	bool nodelay;
-	bool keepalive;
+	// Callbacks
+
+	utcp_recv_t recv;
+	utcp_poll_t poll;
+
+	// TCP State
 
 	uint16_t src;
 	uint16_t dst;
 	enum state state;
 
-	// The following two structures form the TCB
-
 	struct {
 		uint32_t una;
 		uint32_t nxt;
 		uint32_t wnd;
 		uint32_t iss;
+
+		uint32_t last;
+		uint32_t cwnd;
 	} snd;
 
 	struct {
@@ -98,25 +133,54 @@ struct utcp_connection {
 		uint32_t irs;
 	} rcv;
 
-	utcp_recv_t recv;
+	int dupack;
+
+	// Timers
 
 	struct timeval conn_timeout;
 	struct timeval rtrx_timeout;
+	struct timeval rtt_start;
+	uint32_t rtt_seq;
+
+	// Buffers
+
+	struct buffer sndbuf;
+	struct buffer rcvbuf;
+	struct sack sacks[NSACKS];
+
+	// Per-socket options
+
+	bool nodelay;
+	bool keepalive;
+	bool shut_wr;
+
+	// Congestion avoidance state
 
-	char *sndbuf;
-	uint32_t sndbufsize;
-	uint32_t maxsndbufsize;
+	struct timeval tlast;
+	uint64_t bandwidth;
 };
 
 struct utcp {
 	void *priv;
 
+	// Callbacks
+
 	utcp_accept_t accept;
 	utcp_pre_accept_t pre_accept;
 	utcp_send_t send;
 
+	// Global socket options
+
 	uint16_t mtu;
-	int timeout;
+	int timeout; // sec
+
+	// RTT variables
+
+	uint32_t srtt; // usec
+	uint32_t rttvar; // usec
+	uint32_t rto; // usec
+
+	// Connection management
 
 	struct utcp_connection **connections;
 	int nconnections;