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sendQueue: ignore "datagram too large" error (#3328)

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This commit introduces additional platform-dependent checking when the
kernel returns an error. Previously, the session is terminated when
PingFrame sends a discovery packet larger than the limit. With this
commit, the error is checked, and if it is "datagram too large", the
error is ignored.

Additionally,
1. This commit re-enables MTU discovery on Windows unless it
is disabled explicitly by user (Undo #3276),
2. Set IP_DONTFRAGMENT and IPV6_DONTFRAG with error checking on Windows,
   and
3. Set IP_MTU_DISCOVERY to PMTUDISC_DO for both IPv4 and IPv6 on Linux
   so that the kernel will return "message too long".

Fixes #3273 #3327
This commit is contained in:
Rachel Chen 2022-02-20 00:21:32 -08:00 • committed by GitHub
parent f3b098775e
commit fd2c345152
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15 changed files with 124 additions and 57 deletions
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5
conn_helper_linux.go
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@ -5,10 +5,7 @@ package quic
import "golang.org/x/sys/unix"
const (
msgTypeIPTOS = unix.IP_TOS
disablePathMTUDiscovery = false
)
const msgTypeIPTOS = unix.IP_TOS
const (
ipv4RECVPKTINFO = unix.IP_PKTINFO