2021-03-17 10:57:44 +01:00
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#ifndef ICMP_H
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#define ICMP_H
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struct ctx;
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void icmp_sock_handler(struct ctx *c, int s, uint32_t events);
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2021-04-22 13:39:36 +02:00
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int icmp_tap_handler(struct ctx *c, int af, void *addr,
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struct tap_msg *msg, int count);
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2021-03-17 10:57:44 +01:00
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int icmp_sock_init(struct ctx *c);
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/**
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* struct icmp_ctx - Execution context for ICMP routines
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* @s4: ICMP socket number
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* @s6: ICMPv6 socket number
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passt: Spare some syscalls, add some optimisations from profiling
Avoid a bunch of syscalls on forwarding paths by:
- storing minimum and maximum file descriptor numbers for each
protocol, fall back to SO_PROTOCOL query only on overlaps
- allocating a larger receive buffer -- this can result in more
coalesced packets than sendmmsg() can take (UIO_MAXIOV, i.e. 1024),
so make sure we don't exceed that within a single call to protocol
tap handlers
- nesting the handling loop in tap_handler() in the receive loop,
so that we have better chances of filling our receive buffer in
fewer calls
- skipping the recvfrom() in the UDP handler on EPOLLERR -- there's
nothing to be done in that case
and while at it:
- restore the 20ms timer interval for periodic (TCP) events, I
accidentally changed that to 100ms in an earlier commit
- attempt using SO_ZEROCOPY for UDP -- if it's not available,
sendmmsg() will succeed anyway
- fix the handling of the status code from sendmmsg(), if it fails,
we'll try to discard the first message, hence return 1 from the
UDP handler
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2021-04-23 22:22:37 +02:00
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* @fd_min: Lowest file descriptor number for ICMP/ICMPv6 ever used
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* @fd_max: Highest file descriptor number for ICMP/ICMPv6 ever used
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2021-03-17 10:57:44 +01:00
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*/
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struct icmp_ctx {
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int s4;
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int s6;
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passt: Spare some syscalls, add some optimisations from profiling
Avoid a bunch of syscalls on forwarding paths by:
- storing minimum and maximum file descriptor numbers for each
protocol, fall back to SO_PROTOCOL query only on overlaps
- allocating a larger receive buffer -- this can result in more
coalesced packets than sendmmsg() can take (UIO_MAXIOV, i.e. 1024),
so make sure we don't exceed that within a single call to protocol
tap handlers
- nesting the handling loop in tap_handler() in the receive loop,
so that we have better chances of filling our receive buffer in
fewer calls
- skipping the recvfrom() in the UDP handler on EPOLLERR -- there's
nothing to be done in that case
and while at it:
- restore the 20ms timer interval for periodic (TCP) events, I
accidentally changed that to 100ms in an earlier commit
- attempt using SO_ZEROCOPY for UDP -- if it's not available,
sendmmsg() will succeed anyway
- fix the handling of the status code from sendmmsg(), if it fails,
we'll try to discard the first message, hence return 1 from the
UDP handler
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2021-04-23 22:22:37 +02:00
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int fd_min;
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int fd_max;
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2021-03-17 10:57:44 +01:00
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};
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#endif /* ICMP_H */
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