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core/device/tun/tun_netstack.go
| skipped 3 lines |
| 4 | 4 | | |
| 5 | 5 | | import ( |
| 6 | 6 | | "fmt" |
| 7 | | - | "unsafe" |
| 8 | 7 | | |
| 9 | 8 | | "golang.org/x/sys/unix" |
| 10 | 9 | | "gvisor.dev/gvisor/pkg/tcpip/link/fdbased" |
| skipped 70 lines |
| 81 | 80 | | return unix.Close(t.fd) |
| 82 | 81 | | } |
| 83 | 82 | | |
| 84 | | - | // Ref: wireguard tun/tun_linux.go setMTU. |
| 85 | 83 | | func setMTU(name string, n uint32) error { |
| 86 | 84 | | // open datagram socket |
| 87 | 85 | | fd, err := unix.Socket( |
| skipped 7 lines |
| 95 | 93 | | |
| 96 | 94 | | defer unix.Close(fd) |
| 97 | 95 | | |
| 98 | | - | const ifReqSize = unix.IFNAMSIZ + 64 |
| 99 | | - | |
| 100 | | - | // do ioctl call |
| 101 | | - | var ifr [ifReqSize]byte |
| 102 | | - | copy(ifr[:], name) |
| 103 | | - | *(*uint32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = n |
| 104 | | - | _, _, errno := unix.Syscall( |
| 105 | | - | unix.SYS_IOCTL, |
| 106 | | - | uintptr(fd), |
| 107 | | - | uintptr(unix.SIOCSIFMTU), |
| 108 | | - | uintptr(unsafe.Pointer(&ifr[0])), |
| 109 | | - | ) |
| 110 | | - | |
| 111 | | - | if errno != 0 { |
| 112 | | - | return fmt.Errorf("failed to set MTU: %w", errno) |
| | 96 | + | ifr, err := unix.NewIfreq(name) |
| | 97 | + | if err != nil { |
| | 98 | + | return err |
| 113 | 99 | | } |
| 114 | | - | |
| 115 | | - | return nil |
| | 100 | + | ifr.SetUint32(n) |
| | 101 | + | return unix.IoctlIfreq(fd, unix.SIOCSIFMTU, ifr) |
| 116 | 102 | | } |
| 117 | 103 | | |
