Fallback to not using ECN if IP_TOS is not supported #1516
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This is an alternative to #1512 |
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Seems reasonable to me! |
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.
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I tested, it works on my Android with old kernel 3.10.108. |
This was referenced Mar 16, 2023
Ralith
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Mar 17, 2023
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Thanks! |
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On Linux <3.13 sendmsg/sendmmsg system calls
return EINVAL without sending anything if they encounter an
IP_TOScmsg. To ensure we can still sendon 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.