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get_bound_ports_*() now only use their context and ns parameters to determine which forwarding maps they're operating on. Each function needs the map they're actually updating, as well as the map for the other direction, to avoid creating forwarding loops. The UDP function also requires the corresponding TCP map, to implement the behaviour where we forward UDP ports of the same number as bound TCP ports for tools like iperf3. Passing those maps directly as parameters simplifies the code without making the callers life harder, because those already know the relevant maps. IMO, invoking these functions in terms of where they're looking for updated forwarding also makes more logical sense than in terms of where they're looking for bound ports. Given that new way of looking at the functions, also rename them to port_fwd_scan_*(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
44 lines
1.2 KiB
C
44 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 PORT_FWD_H
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#define PORT_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 port_fwd_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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* port_fwd - 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 port_fwd {
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enum port_fwd_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 port_fwd_scan_tcp(struct port_fwd *fwd, const struct port_fwd *rev);
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void port_fwd_scan_udp(struct port_fwd *fwd, const struct port_fwd *rev,
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const struct port_fwd *tcp);
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void port_fwd_init(struct ctx *c);
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#endif /* PORT_FWD_H */
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