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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (c) 2021 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#ifndef TCP_INTERNAL_H
#define TCP_INTERNAL_H
#define MAX_WS 8
#define MAX_WINDOW (1 << (16 + (MAX_WS)))
#define MSS (USHRT_MAX - sizeof(struct tcphdr))
#define SEQ_LE(a, b) ((b) - (a) < MAX_WINDOW)
#define SEQ_LT(a, b) ((b) - (a) - 1 < MAX_WINDOW)
#define SEQ_GE(a, b) ((a) - (b) < MAX_WINDOW)
#define SEQ_GT(a, b) ((a) - (b) - 1 < MAX_WINDOW)
#define FIN (1 << 0)
#define SYN (1 << 1)
#define RST (1 << 2)
#define ACK (1 << 4)
/* Flags for internal usage */
#define DUP_ACK (1 << 5)
#define OPT_EOL 0
#define OPT_NOP 1
#define OPT_MSS 2
#define OPT_MSS_LEN 4
#define OPT_WS 3
#define OPT_WS_LEN 3
#define OPT_SACKP 4
#define OPT_SACK 5
#define OPT_TS 8
#define CONN_V4(conn) (!!inany_v4(&(conn)->faddr))
#define CONN_V6(conn) (!CONN_V4(conn))
void conn_flag_do(const struct ctx *c, struct tcp_tap_conn *conn,
unsigned long flag);
#define conn_flag(c, conn, flag) \
do { \
flow_trace(conn, "flag at %s:%i", __func__, __LINE__); \
conn_flag_do(c, conn, flag); \
} while (0)
void conn_event_do(const struct ctx *c, struct tcp_tap_conn *conn,
unsigned long event);
#define conn_event(c, conn, event) \
do { \
flow_trace(conn, "event at %s:%i", __func__, __LINE__); \
conn_event_do(c, conn, event); \
} while (0)
void tcp_rst_do(struct ctx *c, struct tcp_tap_conn *conn);
#define tcp_rst(c, conn) \
do { \
flow_dbg((conn), "TCP reset at %s:%i", __func__, __LINE__); \
tcp_rst_do(c, conn); \
} while (0)
size_t tcp_fill_headers4(const struct ctx *c,
const struct tcp_tap_conn *conn,
struct iphdr *iph, struct tcphdr *th,
size_t plen, const uint16_t *check,
uint32_t seq);
size_t tcp_fill_headers6(const struct ctx *c,
const struct tcp_tap_conn *conn,
struct ipv6hdr *ip6h, struct tcphdr *th,
size_t plen, uint32_t seq);
int tcp_update_seqack_wnd(const struct ctx *c, struct tcp_tap_conn *conn,
int force_seq, struct tcp_info *tinfo);
int tcp_fill_flag_header(struct ctx *c, struct tcp_tap_conn *conn, int flags,
struct tcphdr *th, char *opts, size_t *optlen);
#endif /* TCP_INTERNAL_H */
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