69 lines
2.9 KiB
Go
69 lines
2.9 KiB
Go
package quic
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import (
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"errors"
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"fmt"
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"net"
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"syscall"
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"github.com/quic-go/quic-go/internal/protocol"
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"github.com/quic-go/quic-go/internal/utils"
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)
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//go:generate sh -c "echo '// Code generated by go generate. DO NOT EDIT.\n// Source: sys_conn_buffers.go\n' > sys_conn_buffers_write.go && sed -e 's/SetReadBuffer/SetWriteBuffer/g' -e 's/setReceiveBuffer/setSendBuffer/g' -e 's/inspectReadBuffer/inspectWriteBuffer/g' -e 's/protocol\\.DesiredReceiveBufferSize/protocol\\.DesiredSendBufferSize/g' -e 's/forceSetReceiveBuffer/forceSetSendBuffer/g' -e 's/receive buffer/send buffer/g' sys_conn_buffers.go | sed '/^\\/\\/go:generate/d' >> sys_conn_buffers_write.go"
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func setReceiveBuffer(c net.PacketConn, logger utils.Logger) error {
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conn, ok := c.(interface{ SetReadBuffer(int) error })
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if !ok {
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return errors.New("connection doesn't allow setting of receive buffer size. Not a *net.UDPConn?")
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}
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var syscallConn syscall.RawConn
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if sc, ok := c.(interface {
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SyscallConn() (syscall.RawConn, error)
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}); ok {
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var err error
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syscallConn, err = sc.SyscallConn()
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if err != nil {
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syscallConn = nil
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}
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}
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// The connection has a SetReadBuffer method, but we couldn't obtain a syscall.RawConn.
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// This shouldn't happen for a net.UDPConn, but is possible if the connection just implements the
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// net.PacketConn interface and the SetReadBuffer method.
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// We have no way of checking if increasing the buffer size actually worked.
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if syscallConn == nil {
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return conn.SetReadBuffer(protocol.DesiredReceiveBufferSize)
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}
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size, err := inspectReadBuffer(syscallConn)
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if err != nil {
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return fmt.Errorf("failed to determine receive buffer size: %w", err)
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}
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if size >= protocol.DesiredReceiveBufferSize {
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logger.Debugf("Conn has receive buffer of %d kiB (wanted: at least %d kiB)", size/1024, protocol.DesiredReceiveBufferSize/1024)
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return nil
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}
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// Ignore the error. We check if we succeeded by querying the buffer size afterward.
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_ = conn.SetReadBuffer(protocol.DesiredReceiveBufferSize)
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newSize, err := inspectReadBuffer(syscallConn)
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if newSize < protocol.DesiredReceiveBufferSize {
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// Try again with RCVBUFFORCE on Linux
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_ = forceSetReceiveBuffer(syscallConn, protocol.DesiredReceiveBufferSize)
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newSize, err = inspectReadBuffer(syscallConn)
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if err != nil {
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return fmt.Errorf("failed to determine receive buffer size: %w", err)
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}
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}
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if err != nil {
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return fmt.Errorf("failed to determine receive buffer size: %w", err)
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}
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if newSize == size {
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return fmt.Errorf("failed to increase receive buffer size (wanted: %d kiB, got %d kiB)", protocol.DesiredReceiveBufferSize/1024, newSize/1024)
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}
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if newSize < protocol.DesiredReceiveBufferSize {
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return fmt.Errorf("failed to sufficiently increase receive buffer size (was: %d kiB, wanted: %d kiB, got: %d kiB)", size/1024, protocol.DesiredReceiveBufferSize/1024, newSize/1024)
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}
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logger.Debugf("Increased receive buffer size to %d kiB", newSize/1024)
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return nil
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}
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