mirror of https://passt.top/passt
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: Stefano Brivio <sbrivio@redhat.com>
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*/
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#ifndef FWD_H
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#define FWD_H
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/* Number of ports for both TCP and UDP */
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#define NUM_PORTS (1U << 16)
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enum fwd_ports_mode {
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FWD_SPEC = 1,
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FWD_NONE,
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FWD_AUTO,
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FWD_ALL,
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};
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#define PORT_BITMAP_SIZE DIV_ROUND_UP(NUM_PORTS, 8)
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/**
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* fwd_ports - Describes port forwarding for one protocol and direction
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* @mode: Overall forwarding mode (all, none, auto, specific ports)
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* @scan4: /proc/net fd to scan for IPv4 ports when in AUTO mode
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* @scan6: /proc/net fd to scan for IPv6 ports when in AUTO mode
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* @map: Bitmap describing which ports are forwarded
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* @delta: Offset between the original destination and mapped port number
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*/
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struct fwd_ports {
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enum fwd_ports_mode mode;
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int scan4;
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int scan6;
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uint8_t map[PORT_BITMAP_SIZE];
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in_port_t delta[NUM_PORTS];
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};
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void fwd_scan_ports_tcp(struct fwd_ports *fwd, const struct fwd_ports *rev);
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void fwd_scan_ports_udp(struct fwd_ports *fwd, const struct fwd_ports *rev,
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const struct fwd_ports *tcp_fwd,
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const struct fwd_ports *tcp_rev);
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void fwd_scan_ports_init(struct ctx *c);
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#endif /* FWD_H */
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