Distinguish between MTU and MSS.

[utcp] / utcp_priv.h

diff --git a/utcp_priv.h b/utcp_priv.h
index b9979539465a7ac7e5cbae1b9e5c3258fc8a445a..de942a8968ae61ef27592126244ad935dcfe5475 100644 (file)
--- 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
@@ -78,9 +94,15 @@ struct buffer {
        uint32_t maxsize;
 };
 
+struct sack {
+       uint32_t offset;
+       uint32_t len;
+};
+
 struct utcp_connection {
        void *priv;
        struct utcp *utcp;
+       uint32_t flags;
 
        bool reapable;
 
@@ -103,11 +125,11 @@ struct utcp_connection {
 
                uint32_t last;
                uint32_t cwnd;
+               uint32_t ssthresh;
        } snd;
 
        struct {
                uint32_t nxt;
-               uint32_t wnd;
                uint32_t irs;
        } rcv;
 
@@ -117,15 +139,20 @@ struct utcp_connection {
 
        struct timeval conn_timeout;
        struct timeval rtrx_timeout;
+       struct timeval rtt_start;
+       uint32_t rtt_seq;
 
-       // Send buffer
+       // Buffers
 
        struct buffer sndbuf;
+       struct buffer rcvbuf;
+       struct sack sacks[NSACKS];
 
        // Per-socket options
 
        bool nodelay;
        bool keepalive;
+       bool shut_wr;
 
        // Congestion avoidance state
 
@@ -144,8 +171,15 @@ struct utcp {
 
        // 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
+
+       // RTT variables
+
+       uint32_t srtt; // usec
+       uint32_t rttvar; // usec
+       uint32_t rto; // usec
 
        // Connection management