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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>
44 lines
1.1 KiB
C
44 lines
1.1 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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#ifndef EPOLL_TYPE_H
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#define EPOLL_TYPE_H
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/**
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* enum epoll_type - Different types of fds we poll over
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*/
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enum epoll_type {
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/* Special value to indicate an invalid type */
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EPOLL_TYPE_NONE = 0,
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/* Connected TCP sockets */
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EPOLL_TYPE_TCP,
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/* Connected TCP sockets (spliced) */
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EPOLL_TYPE_TCP_SPLICE,
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/* Listening TCP sockets */
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EPOLL_TYPE_TCP_LISTEN,
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/* timerfds used for TCP timers */
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EPOLL_TYPE_TCP_TIMER,
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/* UDP sockets */
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EPOLL_TYPE_UDP,
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/* UDP socket for replies on a specific flow */
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EPOLL_TYPE_UDP_REPLY,
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/* ICMP/ICMPv6 ping sockets */
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EPOLL_TYPE_PING,
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/* inotify fd watching for end of netns (pasta) */
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EPOLL_TYPE_NSQUIT_INOTIFY,
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/* timer fd watching for end of netns, fallback for inotify (pasta) */
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EPOLL_TYPE_NSQUIT_TIMER,
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/* tuntap character device */
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EPOLL_TYPE_TAP_PASTA,
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/* socket connected to qemu */
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EPOLL_TYPE_TAP_PASST,
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/* socket listening for qemu socket connections */
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EPOLL_TYPE_TAP_LISTEN,
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EPOLL_NUM_TYPES,
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};
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#endif /* EPOLL_TYPE_H */
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