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