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Fallback to not using ECN if IP_TOS is not supported #1516

Merged
merged 2 commits into from
Mar 17, 2023
Merged

Fallback to not using ECN if IP_TOS is not supported #1516

merged 2 commits into from
Mar 17, 2023

Commits on Mar 16, 2023

  1. Fallback to not using ECN if IP_TOS is not supported 

    On Linux <3.13 sendmsg/sendmmsg system calls
return EINVAL without sending anything if they encounter
an `IP_TOS` cmsg. To ensure we can still send
on such systems, remember if we got an EINVAL error
and switch to "fallback mode" in which we do not try
to transmit ECN at all and only use well-supported features.
    @link2xt
    link2xt committed Mar 16, 2023
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  2. Exclude sendmsg_einval on Windows

    @link2xt
    link2xt committed Mar 16, 2023
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