X-Git-Url: http://git.meshlink.io/?p=utcp;a=blobdiff_plain;f=utcp_priv.h;h=197fd2685a32416f46bc87652ddae5bb27664553;hp=d8f65546dcd810f9d6fe33259dbda4578e5a89b9;hb=HEAD;hpb=f4c52312544ee99bcce46ebcfc0c8e6ac6356fd5

diff --git a/utcp_priv.h b/utcp_priv.h
index d8f6554..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
@@ -71,15 +89,31 @@ static const char *strstate[] __attribute__((unused)) = {
 	[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;
 
 	// Callbacks
 
 	utcp_recv_t recv;
+	utcp_poll_t poll;
 
 	// TCP State
 
@@ -95,11 +129,11 @@ struct utcp_connection {
 
 		uint32_t last;
 		uint32_t cwnd;
+		uint32_t ssthresh;
 	} snd;
 
 	struct {
 		uint32_t nxt;
-		uint32_t wnd;
 		uint32_t irs;
 	} rcv;
 
@@ -107,23 +141,33 @@ struct utcp_connection {
 
 	// Timers
 
-	struct timeval conn_timeout;
-	struct timeval rtrx_timeout;
+	struct timespec conn_timeout;
+	struct timespec rtrx_timeout;
+	struct timespec rtt_start;
+	uint32_t rtt_seq;
+
+	// RTT variables
 
-	// Send buffer
+	uint32_t srtt; // usec
+	uint32_t rttvar; // usec
+	uint32_t rto; // usec
 
-	char *sndbuf;
-	uint32_t sndbufsize;
-	uint32_t maxsndbufsize;
+	// Buffers
+
+	uint32_t prev_free;
+	struct buffer sndbuf;
+	struct buffer rcvbuf;
+	struct sack sacks[NSACKS];
 
 	// Per-socket options
 
 	bool nodelay;
 	bool keepalive;
+	bool shut_wr;
 
 	// Congestion avoidance state
 
-	struct timeval tlast;
+	struct timespec tlast;
 	uint64_t bandwidth;
 };
 
@@ -134,12 +178,18 @@ struct utcp {
 
 	utcp_accept_t accept;
 	utcp_pre_accept_t pre_accept;
+	utcp_retransmit_t retransmit;
 	utcp_send_t send;
 
+	// Packet buffer
+
+	void *pkt;
+
 	// Global socket options
 
-	uint16_t mtu;
-	int timeout;
+	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