X-Git-Url: http://git.meshlink.io/?p=utcp;a=blobdiff_plain;f=utcp_priv.h;h=197fd2685a32416f46bc87652ddae5bb27664553;hp=6c1386307e691ca79babe93f66b62108ada9a177;hb=HEAD;hpb=4368d8c9956242f0bdc00d43ebf32a72332522c1

diff --git a/utcp_priv.h b/utcp_priv.h
index 6c13863..197fd26 100644
--- a/utcp_priv.h
+++ b/utcp_priv.h
@@ -29,9 +29,27 @@
 #define ACK 2
 #define FIN 4
 #define RST 8
+#define MF 16
 
+#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 MAX_UNRELIABLE_SIZE 65536
+#define DEFAULT_MTU 1000
+
+#define USEC_PER_SEC 1000000L
+#define NSEC_PER_SEC 1000000000L
+#define DEFAULT_USER_TIMEOUT 60
+#define START_RTO (1 * USEC_PER_SEC)
+#define MAX_RTO (3 * USEC_PER_SEC)
 
 struct hdr {
 	uint16_t src; // Source port
@@ -57,7 +75,7 @@ enum state {
 	TIME_WAIT
 };
 
-static const char *strstate[] = {
+static const char *strstate[] __attribute__((unused)) = {
 	[CLOSED] = "CLOSED",
 	[LISTEN] = "LISTEN",
 	[SYN_SENT] = "SYN_SENT",
@@ -71,52 +89,109 @@ 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;
+	bool do_poll;
 
-	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;
+		uint32_t ssthresh;
 	} snd;
 
 	struct {
 		uint32_t nxt;
-		uint32_t wnd;
 		uint32_t irs;
 	} rcv;
 
-	utcp_recv_t recv;
+	int dupack;
+
+	// Timers
+
+	struct timespec conn_timeout;
+	struct timespec rtrx_timeout;
+	struct timespec rtt_start;
+	uint32_t rtt_seq;
+
+	// RTT variables
+
+	uint32_t srtt; // usec
+	uint32_t rttvar; // usec
+	uint32_t rto; // usec
+
+	// Buffers
+
+	uint32_t prev_free;
+	struct buffer sndbuf;
+	struct buffer rcvbuf;
+	struct sack sacks[NSACKS];
+
+	// Per-socket options
 
-	struct timeval conn_timeout;
-	struct timeval rtrx_timeout;
+	bool nodelay;
+	bool keepalive;
+	bool shut_wr;
 
-	char *sndbuf;
-	uint32_t sndbufsize;
-	uint32_t maxsndbufsize;
+	// Congestion avoidance state
+
+	struct timespec tlast;
+	uint64_t bandwidth;
 };
 
 struct utcp {
 	void *priv;
 
+	// Callbacks
+
 	utcp_accept_t accept;
 	utcp_pre_accept_t pre_accept;
+	utcp_retransmit_t retransmit;
 	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
+
+	// Connection management
 
 	struct utcp_connection **connections;
 	int nconnections;