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Unlike TCP, UDP has no in-band signalling for the end of a flow. So the only way we remove flows is on a timer if they have no activity for 180s. However, we've started to investigate some error conditions in which we want to prematurely abort / abandon a UDP flow. We can call udp_flow_close(), which will make the flow inert (sockets closed, no epoll events, can't be looked up in hash). However it will still wait 3 minutes to clear away the stale entry. Clean this up by adding an explicit 'closed' flag which will cause a flow to be more promptly cleaned up. We also publish udp_flow_close() so it can be called from other places to abort UDP flows(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
41 lines
1.2 KiB
C
41 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: David Gibson <david@gibson.dropbear.id.au>
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*
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* UDP flow tracking data structures
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*/
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#ifndef UDP_FLOW_H
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#define UDP_FLOW_H
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/**
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* struct udp - Descriptor for a flow of UDP packets
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* @f: Generic flow information
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* @closed: Flow is already closed
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* @ts: Activity timestamp
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* @s: Socket fd (or -1) for each side of the flow
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*/
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struct udp_flow {
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/* Must be first element */
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struct flow_common f;
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bool closed :1;
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time_t ts;
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int s[SIDES];
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};
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struct udp_flow *udp_at_sidx(flow_sidx_t sidx);
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flow_sidx_t udp_flow_from_sock(const struct ctx *c, union epoll_ref ref,
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const union sockaddr_inany *s_in,
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const struct timespec *now);
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flow_sidx_t udp_flow_from_tap(const struct ctx *c,
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uint8_t pif, sa_family_t af,
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const void *saddr, const void *daddr,
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in_port_t srcport, in_port_t dstport,
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const struct timespec *now);
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void udp_flow_close(const struct ctx *c, struct udp_flow *uflow);
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bool udp_flow_defer(const struct udp_flow *uflow);
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bool udp_flow_timer(const struct ctx *c, struct udp_flow *uflow,
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const struct timespec *now);
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#endif /* UDP_FLOW_H */
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