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Use syserr style error translation in netstack's rawfile

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Replacing map lookups with slice indexing is higher performance.

PiperOrigin-RevId: 219569901
Change-Id: I9b7cd22abd4b95383025edbd5a80d1c1a4496936
This commit is contained in:
Ian Gudger
2018-10-31 18:22:05 -07:00
committed by Shentubot
parent fb613020c7
commit eeddae1199
1 changed files with 37 additions and 25 deletions
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pkg/tcpip/link/rawfile/errors.go
+37 -25
View File
@@ -17,42 +17,54 @@
package rawfile
import (
"fmt"
"syscall"
"gvisor.googlesource.com/gvisor/pkg/tcpip"
)
var translations = map[syscall.Errno]*tcpip.Error{
syscall.EEXIST: tcpip.ErrDuplicateAddress,
syscall.ENETUNREACH: tcpip.ErrNoRoute,
syscall.EINVAL: tcpip.ErrInvalidEndpointState,
syscall.EALREADY: tcpip.ErrAlreadyConnecting,
syscall.EISCONN: tcpip.ErrAlreadyConnected,
syscall.EADDRINUSE: tcpip.ErrPortInUse,
syscall.EADDRNOTAVAIL: tcpip.ErrBadLocalAddress,
syscall.EPIPE: tcpip.ErrClosedForSend,
syscall.EWOULDBLOCK: tcpip.ErrWouldBlock,
syscall.ECONNREFUSED: tcpip.ErrConnectionRefused,
syscall.ETIMEDOUT: tcpip.ErrTimeout,
syscall.EINPROGRESS: tcpip.ErrConnectStarted,
syscall.EDESTADDRREQ: tcpip.ErrDestinationRequired,
syscall.ENOTSUP: tcpip.ErrNotSupported,
syscall.ENOTTY: tcpip.ErrQueueSizeNotSupported,
syscall.ENOTCONN: tcpip.ErrNotConnected,
syscall.ECONNRESET: tcpip.ErrConnectionReset,
syscall.ECONNABORTED: tcpip.ErrConnectionAborted,
syscall.EMSGSIZE: tcpip.ErrMessageTooLong,
syscall.ENOBUFS: tcpip.ErrNoBufferSpace,
}
const maxErrno = 134
var translations [maxErrno]*tcpip.Error
// TranslateErrno translate an errno from the syscall package into a
// *tcpip.Error.
//
// Not all errnos are supported and this function will panic on unreconized
// errnos.
// Valid, but unreconigized errnos will be translated to
// tcpip.ErrInvalidEndpointState (EINVAL). Panics on invalid errnos.
func TranslateErrno(e syscall.Errno) *tcpip.Error {
if err, ok := translations[e]; ok {
if err := translations[e]; err != nil {
return err
}
return tcpip.ErrInvalidEndpointState
}
func addTranslation(host syscall.Errno, trans *tcpip.Error) {
if translations[host] != nil {
panic(fmt.Sprintf("duplicate translation for host errno %q (%d)", host.Error(), host))
}
translations[host] = trans
}
func init() {
addTranslation(syscall.EEXIST, tcpip.ErrDuplicateAddress)
addTranslation(syscall.ENETUNREACH, tcpip.ErrNoRoute)
addTranslation(syscall.EINVAL, tcpip.ErrInvalidEndpointState)
addTranslation(syscall.EALREADY, tcpip.ErrAlreadyConnecting)
addTranslation(syscall.EISCONN, tcpip.ErrAlreadyConnected)
addTranslation(syscall.EADDRINUSE, tcpip.ErrPortInUse)
addTranslation(syscall.EADDRNOTAVAIL, tcpip.ErrBadLocalAddress)
addTranslation(syscall.EPIPE, tcpip.ErrClosedForSend)
addTranslation(syscall.EWOULDBLOCK, tcpip.ErrWouldBlock)
addTranslation(syscall.ECONNREFUSED, tcpip.ErrConnectionRefused)
addTranslation(syscall.ETIMEDOUT, tcpip.ErrTimeout)
addTranslation(syscall.EINPROGRESS, tcpip.ErrConnectStarted)
addTranslation(syscall.EDESTADDRREQ, tcpip.ErrDestinationRequired)
addTranslation(syscall.ENOTSUP, tcpip.ErrNotSupported)
addTranslation(syscall.ENOTTY, tcpip.ErrQueueSizeNotSupported)
addTranslation(syscall.ENOTCONN, tcpip.ErrNotConnected)
addTranslation(syscall.ECONNRESET, tcpip.ErrConnectionReset)
addTranslation(syscall.ECONNABORTED, tcpip.ErrConnectionAborted)
addTranslation(syscall.EMSGSIZE, tcpip.ErrMessageTooLong)
addTranslation(syscall.ENOBUFS, tcpip.ErrNoBufferSpace)
}