#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
+
+static const long USEC_PER_SEC = 1000000;
+static const long NSEC_PER_SEC = 1000000000;
+static const int DEFAULT_USER_TIMEOUT = 60; // sec
+static const long START_RTO = 1 * USEC_PER_SEC; // usec
+static const long MAX_RTO = 3 * USEC_PER_SEC; // usec
struct hdr {
uint16_t src; // Source port
[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
uint32_t last;
uint32_t cwnd;
+ uint32_t ssthresh;
} snd;
struct {
uint32_t nxt;
- uint32_t wnd;
uint32_t irs;
} rcv;
// 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;
- // Send buffer
+ // Buffers
- char *sndbuf;
- uint32_t sndbufused;
- uint32_t sndbufsize;
- uint32_t maxsndbufsize;
+ 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;
};
utcp_pre_accept_t pre_accept;
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
+
+ // RTT variables
+
+ uint32_t srtt; // usec
+ uint32_t rttvar; // usec
+ uint32_t rto; // usec
// Connection management