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