e6feb5a892
The term "forwarding address" to indicate the local-to-passt address was well-intentioned, but ends up being kinda confusing. As discussed on a recent call, let's try "our" instead. (While we're there correct an error in flow_initiate_af()s comments where we referred to parameters by the wrong name). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
100 lines
2.9 KiB
C
100 lines
2.9 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 MSS4 ROUND_DOWN(IP_MAX_MTU - \
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sizeof(struct tcphdr) - \
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sizeof(struct iphdr), \
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sizeof(uint32_t))
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#define MSS6 ROUND_DOWN(IP_MAX_MTU - \
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sizeof(struct tcphdr) - \
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sizeof(struct ipv6hdr), \
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sizeof(uint32_t))
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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 TAPSIDE(conn_) ((conn_)->f.pif[1] == PIF_TAP)
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#define TAPFLOW(conn_) (&((conn_)->f.side[TAPSIDE(conn_)]))
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#define TAP_SIDX(conn_) (FLOW_SIDX((conn_), TAPSIDE(conn_)))
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#define CONN_V4(conn) (!!inany_v4(&TAPFLOW(conn)->oaddr))
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#define CONN_V6(conn) (!CONN_V4(conn))
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/*
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* enum tcp_iov_parts - I/O vector parts for one TCP frame
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* @TCP_IOV_TAP tap backend specific header
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* @TCP_IOV_ETH Ethernet header
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* @TCP_IOV_IP IP (v4/v6) header
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* @TCP_IOV_PAYLOAD IP payload (TCP header + data)
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* @TCP_NUM_IOVS the number of entries in the iovec array
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*/
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enum tcp_iov_parts {
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TCP_IOV_TAP = 0,
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TCP_IOV_ETH = 1,
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TCP_IOV_IP = 2,
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TCP_IOV_PAYLOAD = 3,
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TCP_NUM_IOVS
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};
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extern char tcp_buf_discard [MAX_WINDOW];
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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_l2_buf_fill_headers(const struct tcp_tap_conn *conn,
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struct iovec *iov, size_t dlen,
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const uint16_t *check, 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_prepare_flags(struct ctx *c, struct tcp_tap_conn *conn, int flags,
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struct tcphdr *th, char *data, size_t *optlen);
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#endif /* TCP_INTERNAL_H */
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