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tun: windows: silently drop packet when ring is full

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This commit is contained in:
Jason A. Donenfeld 2019-07-18 15:48:34 +02:00
parent 6c50fedd8e
commit 1e39c33ab1
1 changed files with 2 additions and 2 deletions
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4
tun/tun_windows.go
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@ -22,7 +22,7 @@ import (
const ( const (
packetAlignment uint32 = 4 // Number of bytes packets are aligned to in rings packetAlignment uint32 = 4 // Number of bytes packets are aligned to in rings
packetSizeMax uint32 = 0xffff // Maximum packet size packetSizeMax uint32 = 0xffff // Maximum packet size
packetCapacity uint32 = 0x100000 // Ring capacity (defaults to 1MiB, must be a power of 2) packetCapacity uint32 = 0x800000 // Ring capacity, 8MiB
packetTrailingSize uint32 = uint32(unsafe.Sizeof(packetHeader{})) + ((packetSizeMax + (packetAlignment - 1)) &^ (packetAlignment - 1)) - packetAlignment packetTrailingSize uint32 = uint32(unsafe.Sizeof(packetHeader{})) + ((packetSizeMax + (packetAlignment - 1)) &^ (packetAlignment - 1)) - packetAlignment
ioctlRegisterRings uint32 = (0x22 /*FILE_DEVICE_UNKNOWN*/ << 16) | (0x800 << 2) | 0 /*METHOD_BUFFERED*/ | (0x3 /*FILE_READ_DATA | FILE_WRITE_DATA*/ << 14) ioctlRegisterRings uint32 = (0x22 /*FILE_DEVICE_UNKNOWN*/ << 16) | (0x800 << 2) | 0 /*METHOD_BUFFERED*/ | (0x3 /*FILE_READ_DATA | FILE_WRITE_DATA*/ << 14)
@ -381,7 +381,7 @@ func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
buffSpace := tun.rings.receive.ring.wrap(buffHead - buffTail - packetAlignment) buffSpace := tun.rings.receive.ring.wrap(buffHead - buffTail - packetAlignment)
if alignedPacketSize > buffSpace { if alignedPacketSize > buffSpace {
return 0, errors.New("receive ring full") return 0, nil // Dropping when ring is full.
} }
packet := (*packet)(unsafe.Pointer(&tun.rings.receive.ring.data[buffTail])) packet := (*packet)(unsafe.Pointer(&tun.rings.receive.ring.data[buffTail]))