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#ifndef _NETINET_TCP_H
#define _NETINET_TCP_H
#include <inttypes.h>
#include <endian.h>
struct tcphdr { /* size 20/0x14 40/0x28 with IP header */
uint16_t source; /* offset 0 20/0x14 */
uint16_t dest; /* offset 2 22/0x16 */
uint32_t seq; /* offset 4 24/0x18 */
uint32_t ack_seq; /* offset 8 28/0x1c */
#if __BYTE_ORDER == __LITTLE_ENDIAN
uint16_t res1:4, doff:4, fin:1, syn:1, rst:1, psh:1, ack:1, urg:1, ece:1, cwr:1;
#else
uint16_t doff:4, res1:4, cwr:1, ece:1, urg:1, ack:1, psh:1, rst:1, syn:1, fin:1;
#endif
/* offset 12/0xc 32/0x20 */
uint16_t window; /* offset 14/0xe 34/0x22 */
uint16_t check; /* offset 16/0x10 36/0x24 */
uint16_t urg_ptr; /* offset 18/0x12 38/0x26 */
};
enum {
TCP_ESTABLISHED = 1,
TCP_SYN_SENT,
TCP_SYN_RECV,
TCP_FIN_WAIT1,
TCP_FIN_WAIT2,
TCP_TIME_WAIT,
TCP_CLOSE,
TCP_CLOSE_WAIT,
TCP_LAST_ACK,
TCP_LISTEN,
TCP_CLOSING, /* now a valid state */
TCP_MAX_STATES /* Leave at the end! */
};
#define TCP_STATE_MASK 0xF
#define TCP_ACTION_FIN (1 << 7)
enum {
TCPF_ESTABLISHED = (1 << 1),
TCPF_SYN_SENT = (1 << 2),
TCPF_SYN_RECV = (1 << 3),
TCPF_FIN_WAIT1 = (1 << 4),
TCPF_FIN_WAIT2 = (1 << 5),
TCPF_TIME_WAIT = (1 << 6),
TCPF_CLOSE = (1 << 7),
TCPF_CLOSE_WAIT = (1 << 8),
TCPF_LAST_ACK = (1 << 9),
TCPF_LISTEN = (1 << 10),
TCPF_CLOSING = (1 << 11)
};
/*
* The union cast uses a gcc extension to avoid aliasing problems
* (union is compatible to any of its members)
* This means this part of the code is -fstrict-aliasing safe now.
*/
union tcp_word_hdr {
struct tcphdr hdr;
uint32_t words[5];
};
#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
enum {
#if __BYTE_ORDER == __LITTLE_ENDIAN
TCP_FLAG_CWR = 0x00008000,
TCP_FLAG_ECE = 0x00004000,
TCP_FLAG_URG = 0x00002000,
TCP_FLAG_ACK = 0x00001000,
TCP_FLAG_PSH = 0x00000800,
TCP_FLAG_RST = 0x00000400,
TCP_FLAG_SYN = 0x00000200,
TCP_FLAG_FIN = 0x00000100,
TCP_RESERVED_BITS = 0x0000C00F,
TCP_DATA_OFFSET = 0x000000F0
#else
TCP_FLAG_CWR = 0x00800000,
TCP_FLAG_ECE = 0x00400000,
TCP_FLAG_URG = 0x00200000,
TCP_FLAG_ACK = 0x00100000,
TCP_FLAG_PSH = 0x00080000,
TCP_FLAG_RST = 0x00040000,
TCP_FLAG_SYN = 0x00020000,
TCP_FLAG_FIN = 0x00010000,
TCP_RESERVED_BITS = 0x0FC00000,
TCP_DATA_OFFSET = 0xF0000000
#endif
};
/* TCP socket options */
#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
#define TCP_MAXSEG 2 /* Limit MSS */
#define TCP_CORK 3 /* Never send partially complete segments */
#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
#define TCP_KEEPINTVL 5 /* Interval between keepalives */
#define TCP_KEEPCNT 6 /* Number of keepalives before death */
#define TCP_SYNCNT 7 /* Number of SYN retransmits */
#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
#define TCP_INFO 11 /* Information about this connection. */
#define TCP_QUICKACK 12 /* Block/reenable quick acks */
#define TCPI_OPT_TIMESTAMPS 1
#define TCPI_OPT_SACK 2
#define TCPI_OPT_WSCALE 4
#define TCPI_OPT_ECN 8
enum tcp_ca_state {
TCP_CA_Open = 0,
#define TCPF_CA_Open (1<<TCP_CA_Open)
TCP_CA_Disorder = 1,
#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
TCP_CA_CWR = 2,
#define TCPF_CA_CWR (1<<TCP_CA_CWR)
TCP_CA_Recovery = 3,
#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
TCP_CA_Loss = 4
#define TCPF_CA_Loss (1<<TCP_CA_Loss)
};
struct tcp_info {
uint8_t tcpi_state;
uint8_t tcpi_ca_state;
uint8_t tcpi_retransmits;
uint8_t tcpi_probes;
uint8_t tcpi_backoff;
uint8_t tcpi_options;
uint8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
uint32_t tcpi_rto;
uint32_t tcpi_ato;
uint32_t tcpi_snd_mss;
uint32_t tcpi_rcv_mss;
uint32_t tcpi_unacked;
uint32_t tcpi_sacked;
uint32_t tcpi_lost;
uint32_t tcpi_retrans;
uint32_t tcpi_fackets;
/* Times. */
uint32_t tcpi_last_data_sent;
uint32_t tcpi_last_ack_sent; /* Not remembered, sorry. */
uint32_t tcpi_last_data_recv;
uint32_t tcpi_last_ack_recv;
/* Metrics. */
uint32_t tcpi_pmtu;
uint32_t tcpi_rcv_ssthresh;
uint32_t tcpi_rtt;
uint32_t tcpi_rttvar;
uint32_t tcpi_snd_ssthresh;
uint32_t tcpi_snd_cwnd;
uint32_t tcpi_advmss;
uint32_t tcpi_reordering;
};
#endif
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