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Refactor: Support TCP/IPv6 in REDIRECT mode 

十分感谢 @badO1a5A90 @LGA1150 协助测试

https://github.com/XTLS/Xray-core/issues/48#issuecomment-741509789

https://github.com/v2ray/v2ray-core/issues/1309#issuecomment-447432696
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RPRX 2020-12-09 12:16:38 +00:00 committed by GitHub
parent b3f3c5be81
commit f1eb5e3d08
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1 changed files with 12 additions and 5 deletions
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17
transport/internet/tcp/sockopt_linux.go
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@ -1,10 +1,10 @@
// +build linux
// +build !confonly
package tcp
import (
"syscall"
"unsafe"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/transport/internet"
@ -23,14 +23,21 @@ func GetOriginalDestination(conn internet.Connection) (net.Destination, error) {
}
var dest net.Destination
err = rawConn.Control(func(fd uintptr) {
addr, err := syscall.GetsockoptIPv6Mreq(int(fd), syscall.IPPROTO_IP, SO_ORIGINAL_DST)
level := syscall.IPPROTO_IP
if conn.RemoteAddr().String()[0] == '[' {
level = syscall.IPPROTO_IPV6
}
addr, err := syscall.GetsockoptIPv6MTUInfo(int(fd), level, SO_ORIGINAL_DST)
if err != nil {
newError("failed to call getsockopt").Base(err).WriteToLog()
return
}
ip := net.IPAddress(addr.Multiaddr[4:8])
port := uint16(addr.Multiaddr[2])<<8 + uint16(addr.Multiaddr[3])
dest = net.TCPDestination(ip, net.Port(port))
ip := (*[4]byte)(unsafe.Pointer(&addr.Addr.Flowinfo))[:4]
if level == syscall.IPPROTO_IPV6 {
ip = addr.Addr.Addr[:]
}
port := (*[2]byte)(unsafe.Pointer(&addr.Addr.Port))[:2]
dest = net.TCPDestination(net.IPAddress(ip), net.PortFromBytes(port))
})
if err != nil {
return net.Destination{}, newError("failed to control connection").Base(err)