diff options
Diffstat (limited to 'fwd.h')
| -rw-r--r-- | fwd.h | 44 |
1 files changed, 44 insertions, 0 deletions
@@ -0,0 +1,44 @@ +/* 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 FWD_H +#define FWD_H + +/* Number of ports for both TCP and UDP */ +#define NUM_PORTS (1U << 16) + +enum fwd_ports_mode { + FWD_SPEC = 1, + FWD_NONE, + FWD_AUTO, + FWD_ALL, +}; + +#define PORT_BITMAP_SIZE DIV_ROUND_UP(NUM_PORTS, 8) + +/** + * fwd_ports - 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 fwd_ports { + enum fwd_ports_mode mode; + int scan4; + int scan6; + uint8_t map[PORT_BITMAP_SIZE]; + in_port_t delta[NUM_PORTS]; +}; + +void fwd_scan_ports_tcp(struct fwd_ports *fwd, const struct fwd_ports *rev); +void fwd_scan_ports_udp(struct fwd_ports *fwd, const struct fwd_ports *rev, + const struct fwd_ports *tcp_fwd, + const struct fwd_ports *tcp_rev); +void fwd_scan_ports_init(struct ctx *c); + +#endif /* FWD_H */ |