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c1eff9a3c6
Since kernel version 5.7, commit c427bfec18f2 ("net: core: enable
SO_BINDTODEVICE for non-root users"), we can bind sockets to
interfaces, if they haven't been bound yet (as in bind()).
Introduce an optional interface specification for forwarded ports,
prefixed by %, that can be passed together with an address.
Reported use case: running local services that use ports we want
to have externally forwarded:
https://github.com/containers/podman/issues/14425
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* SPDX-License-Identifier: AGPL-3.0-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 UDP_H
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#define UDP_H
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#define UDP_TIMER_INTERVAL 1000 /* ms */
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void udp_sock_handler(const struct ctx *c, union epoll_ref ref, uint32_t events,
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const struct timespec *now);
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int udp_tap_handler(struct ctx *c, int af, const void *addr,
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const struct pool *p, const struct timespec *now);
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void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
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const void *addr, const char *ifname, in_port_t port);
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int udp_init(struct ctx *c);
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void udp_timer(struct ctx *c, const struct timespec *ts);
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void udp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s,
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const uint32_t *ip_da);
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/**
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* union udp_epoll_ref - epoll reference portion for TCP connections
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* @bound: Set if this file descriptor is a bound socket
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* @splice: Set if descriptor is associated to "spliced" connection
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* @v6: Set for IPv6 sockets or connections
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* @port: Source port for connected sockets, bound port otherwise
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* @u32: Opaque u32 value of reference
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*/
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union udp_epoll_ref {
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struct {
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uint32_t bound:1,
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splice:3,
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#define UDP_TO_NS 1
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#define UDP_TO_INIT 2
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#define UDP_BACK_TO_NS 3
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#define UDP_BACK_TO_INIT 4
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v6:1,
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port:16;
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} udp;
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uint32_t u32;
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};
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/**
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* udp_port_fwd - UDP specific port forwarding configuration
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* @f: Generic forwarding configuration
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* @rdelta: Reversed delta map to translate source ports on return packets
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*/
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struct udp_port_fwd {
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struct port_fwd f;
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in_port_t rdelta[NUM_PORTS];
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};
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/**
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* struct udp_ctx - Execution context for UDP
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* @fwd_in: Port forwarding configuration for inbound packets
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* @fwd_out: Port forwarding configuration for outbound packets
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* @timer_run: Timestamp of most recent timer run
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*/
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struct udp_ctx {
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struct udp_port_fwd fwd_in;
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struct udp_port_fwd fwd_out;
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struct timespec timer_run;
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};
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#endif /* UDP_H */
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