e0647ad80c
When forwarding a datagram to a socket, we need to find a socket with a suitable local address to send it. Currently we keep track of such sockets in an array indexed by local port, but this can't properly handle cases where we have multiple local addresses in active use. For "spliced" (socket to socket) cases, improve this by instead opening a socket specifically for the target side of the flow. We connect() as well as bind()ing that socket, so that it will only receive the flow's reply packets, not anything else. We direct datagrams sent via that socket using the addresses from the flow table, effectively replacing bespoke addressing logic with the unified logic in fwd.c When we create the flow, we also take a duplicate of the originating socket, and use that to deliver reply datagrams back to the origin, again using addresses from the flow table entry. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-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_portmap_clear(void);
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void udp_buf_sock_handler(const struct ctx *c, union epoll_ref ref,
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uint32_t events, const struct timespec *now);
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void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
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uint32_t events, const struct timespec *now);
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int udp_tap_handler(struct ctx *c, uint8_t pif, sa_family_t af,
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const void *saddr, const void *daddr,
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const struct pool *p, int idx, const struct timespec *now);
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int 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 *now);
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void udp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s);
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/**
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* union udp_epoll_ref - epoll reference portion for TCP connections
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* @port: Source port for connected sockets, bound port otherwise
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* @pif: pif for this socket
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* @bound: Set if this file descriptor is a bound socket
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* @splice: Set if descriptor packets to be "spliced"
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* @orig: Set if a spliced socket which can originate "connections"
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* @v6: Set for IPv6 sockets or connections
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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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in_port_t port;
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uint8_t pif;
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bool splice:1,
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orig:1,
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v6:1;
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};
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uint32_t u32;
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};
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/**
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* udp_fwd_ports - 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_fwd_ports {
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struct fwd_ports 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_fwd_ports fwd_in;
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struct udp_fwd_ports 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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