X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=utcp_priv.h;h=7d2d07396c7c6b097d39ea39bd23dfca98f43be1;hb=bbd35b9f705bc7684cf469d87248c8fb3f7c85c7;hp=5a72ce9a1fd58a0ffecd9872a102d8cc899123d9;hpb=365dd2877f26120742c409e62865b7e563ec87fa;p=utcp

diff --git a/utcp_priv.h b/utcp_priv.h
index 5a72ce9..7d2d073 100644
--- a/utcp_priv.h
+++ b/utcp_priv.h
@@ -30,6 +30,25 @@
 #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
 	uint16_t dst; // Destination port
@@ -54,7 +73,7 @@ enum state {
 	TIME_WAIT
 };
 
-static const char *strstate[] = {
+static const char *strstate[] __attribute__((unused)) = {
 	[CLOSED] = "CLOSED",
 	[LISTEN] = "LISTEN",
 	[SYN_SENT] = "SYN_SENT",
@@ -68,48 +87,106 @@ static const char *strstate[] = {
 	[TIME_WAIT] = "TIME_WAIT"
 };
 
+struct buffer {
+	char *data;
+	uint32_t offset;
+	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;
 
+	// 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;
+		uint32_t ssthresh;
 	} snd;
 
 	struct {
 		uint32_t nxt;
-		uint32_t wnd;
 		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;
+	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;
 
-	uint16_t mtu;
-	int timeout;
+	// Packet buffer
+
+	void *pkt;
+
+	// Global socket options
+
+	uint16_t mtu; // The maximum size of a UTCP packet, including headers.
+	uint16_t mss; // The maximum size of the payload of a UTCP packet.
+	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;