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sendQueue: ignore "datagram too large" error
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 quic-go#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 quic-go#3273 quic-go#3327
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,8 @@ | ||
//go:build !linux && !windows | ||
// +build !linux,!windows | ||
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package quic | ||
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func setOOBSockOpts(fd uintptr) { | ||
// no-op on unsupported platforms | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,15 @@ | ||
//go:build linux | ||
// +build linux | ||
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package quic | ||
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import ( | ||
"golang.org/x/sys/unix" | ||
) | ||
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func setOOBSockOpts(fd uintptr) { | ||
// Enabling IP_MTU_DISCOVER will force the kernel to return "sendto: message too long" | ||
// and the datagram will not be fragmented | ||
unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_MTU_DISCOVER, unix.IP_PMTUDISC_DO) | ||
unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_MTU_DISCOVER, unix.IPV6_PMTUDISC_DO) | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,9 @@ | ||
//go:build !linux && !windows | ||
// +build !linux,!windows | ||
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package quic | ||
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func isMsgSizeErr(err error) bool { | ||
// to be implemented for more specific platforms | ||
return false | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,15 @@ | ||
//go:build linux | ||
// +build linux | ||
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package quic | ||
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import ( | ||
"errors" | ||
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"golang.org/x/sys/unix" | ||
) | ||
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func isMsgSizeErr(err error) bool { | ||
// https://man7.org/linux/man-pages/man7/udp.7.html | ||
return errors.Is(err, unix.EMSGSIZE) | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,15 @@ | ||
//go:build windows | ||
// +build windows | ||
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package quic | ||
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import ( | ||
"errors" | ||
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"golang.org/x/sys/windows" | ||
) | ||
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func isMsgSizeErr(err error) bool { | ||
// https://docs.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2 | ||
return errors.Is(err, windows.WSAEMSGSIZE) | ||
} |
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