diff options
Diffstat (limited to 'tcp_internal.h')
-rw-r--r-- | tcp_internal.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/tcp_internal.h b/tcp_internal.h new file mode 100644 index 0000000..0f3db1f --- /dev/null +++ b/tcp_internal.h @@ -0,0 +1,79 @@ +/* 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 */ |