Beispiel #1
0
// NeighList gets a list of IP-MAC mappings in the system (ARP table).
// Equivalent to: `ip neighbor show`.
// The list can be filtered by link and ip family.
func NeighList(linkIndex, family int) ([]Neigh, error) {
	req := nl.NewNetlinkRequest(syscall.RTM_GETNEIGH, syscall.NLM_F_DUMP)
	msg := Ndmsg{
		Family: uint8(family),
		Index:  uint32(linkIndex),
	}
	req.AddData(&msg)

	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWNEIGH)
	if err != nil {
		return nil, err
	}

	var res []Neigh
	for _, m := range msgs {
		ndm := deserializeNdmsg(m)
		if linkIndex != 0 && int(ndm.Index) != linkIndex {
			// Ignore messages from other interfaces
			continue
		}

		neigh, err := NeighDeserialize(m)
		if err != nil {
			continue
		}

		res = append(res, *neigh)
	}

	return res, nil
}
// XfrmPolicyAdd will add an xfrm policy to the system.
// Equivalent to: `ip xfrm policy add $policy`
func XfrmPolicyAdd(policy *XfrmPolicy) error {
	req := nl.NewNetlinkRequest(nl.XFRM_MSG_NEWPOLICY, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)

	msg := &nl.XfrmUserpolicyInfo{}
	selFromPolicy(&msg.Sel, policy)
	msg.Priority = uint32(policy.Priority)
	msg.Index = uint32(policy.Index)
	msg.Dir = uint8(policy.Dir)
	msg.Lft.SoftByteLimit = nl.XFRM_INF
	msg.Lft.HardByteLimit = nl.XFRM_INF
	msg.Lft.SoftPacketLimit = nl.XFRM_INF
	msg.Lft.HardPacketLimit = nl.XFRM_INF
	req.AddData(msg)

	tmplData := make([]byte, nl.SizeofXfrmUserTmpl*len(policy.Tmpls))
	for i, tmpl := range policy.Tmpls {
		start := i * nl.SizeofXfrmUserTmpl
		userTmpl := nl.DeserializeXfrmUserTmpl(tmplData[start : start+nl.SizeofXfrmUserTmpl])
		userTmpl.XfrmId.Daddr.FromIP(tmpl.Dst)
		userTmpl.Saddr.FromIP(tmpl.Src)
		userTmpl.XfrmId.Proto = uint8(tmpl.Proto)
		userTmpl.Mode = uint8(tmpl.Mode)
		userTmpl.Reqid = uint32(tmpl.Reqid)
		userTmpl.Aalgos = ^uint32(0)
		userTmpl.Ealgos = ^uint32(0)
		userTmpl.Calgos = ^uint32(0)
	}
	if len(tmplData) > 0 {
		tmpls := nl.NewRtAttr(nl.XFRMA_TMPL, tmplData)
		req.AddData(tmpls)
	}

	_, err := req.Execute(syscall.NETLINK_XFRM, 0)
	return err
}
Beispiel #3
0
// LinkByIndex finds a link by index and returns a pointer to the object.
func LinkByIndex(index int) (Link, error) {
	req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	msg.Index = int32(index)
	req.AddData(msg)

	return execGetLink(req)
}
// XfrmPolicyDel will delete an xfrm policy from the system. Note that
// the Tmpls are ignored when matching the policy to delete.
// Equivalent to: `ip xfrm policy del $policy`
func XfrmPolicyDel(policy *XfrmPolicy) error {
	req := nl.NewNetlinkRequest(nl.XFRM_MSG_DELPOLICY, syscall.NLM_F_ACK)

	msg := &nl.XfrmUserpolicyId{}
	selFromPolicy(&msg.Sel, policy)
	msg.Index = uint32(policy.Index)
	msg.Dir = uint8(policy.Dir)
	req.AddData(msg)

	_, err := req.Execute(syscall.NETLINK_XFRM, 0)
	return err
}
// XfrmPolicyList gets a list of xfrm policies in the system.
// Equivalent to: `ip xfrm policy show`.
// The list can be filtered by ip family.
func XfrmPolicyList(family int) ([]XfrmPolicy, error) {
	req := nl.NewNetlinkRequest(nl.XFRM_MSG_GETPOLICY, syscall.NLM_F_DUMP)

	msg := nl.NewIfInfomsg(family)
	req.AddData(msg)

	msgs, err := req.Execute(syscall.NETLINK_XFRM, nl.XFRM_MSG_NEWPOLICY)
	if err != nil {
		return nil, err
	}

	var res []XfrmPolicy
	for _, m := range msgs {
		msg := nl.DeserializeXfrmUserpolicyInfo(m)

		if family != FAMILY_ALL && family != int(msg.Sel.Family) {
			continue
		}

		var policy XfrmPolicy

		policy.Dst = msg.Sel.Daddr.ToIPNet(msg.Sel.PrefixlenD)
		policy.Src = msg.Sel.Saddr.ToIPNet(msg.Sel.PrefixlenS)
		policy.Priority = int(msg.Priority)
		policy.Index = int(msg.Index)
		policy.Dir = Dir(msg.Dir)

		attrs, err := nl.ParseRouteAttr(m[msg.Len():])
		if err != nil {
			return nil, err
		}

		for _, attr := range attrs {
			switch attr.Attr.Type {
			case nl.XFRMA_TMPL:
				max := len(attr.Value)
				for i := 0; i < max; i += nl.SizeofXfrmUserTmpl {
					var resTmpl XfrmPolicyTmpl
					tmpl := nl.DeserializeXfrmUserTmpl(attr.Value[i : i+nl.SizeofXfrmUserTmpl])
					resTmpl.Dst = tmpl.XfrmId.Daddr.ToIP()
					resTmpl.Src = tmpl.Saddr.ToIP()
					resTmpl.Proto = Proto(tmpl.XfrmId.Proto)
					resTmpl.Mode = Mode(tmpl.Mode)
					resTmpl.Reqid = int(tmpl.Reqid)
					policy.Tmpls = append(policy.Tmpls, resTmpl)
				}
			}
		}
		res = append(res, policy)
	}
	return res, nil
}
Beispiel #6
0
func LinkGetProtinfo(link Link) (Protinfo, error) {
	base := link.Attrs()
	ensureIndex(base)
	var pi Protinfo
	req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_DUMP)
	msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
	req.AddData(msg)
	msgs, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	if err != nil {
		return pi, err
	}

	for _, m := range msgs {
		ans := nl.DeserializeIfInfomsg(m)
		if int(ans.Index) != base.Index {
			continue
		}
		attrs, err := nl.ParseRouteAttr(m[ans.Len():])
		if err != nil {
			return pi, err
		}
		for _, attr := range attrs {
			if attr.Attr.Type != syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED {
				continue
			}
			infos, err := nl.ParseRouteAttr(attr.Value)
			if err != nil {
				return pi, err
			}
			var pi Protinfo
			for _, info := range infos {
				switch info.Attr.Type {
				case nl.IFLA_BRPORT_MODE:
					pi.Hairpin = byteToBool(info.Value[0])
				case nl.IFLA_BRPORT_GUARD:
					pi.Guard = byteToBool(info.Value[0])
				case nl.IFLA_BRPORT_FAST_LEAVE:
					pi.FastLeave = byteToBool(info.Value[0])
				case nl.IFLA_BRPORT_PROTECT:
					pi.RootBlock = byteToBool(info.Value[0])
				case nl.IFLA_BRPORT_LEARNING:
					pi.Learning = byteToBool(info.Value[0])
				case nl.IFLA_BRPORT_UNICAST_FLOOD:
					pi.Flood = byteToBool(info.Value[0])
				}
			}
			return pi, nil
		}
	}
	return pi, fmt.Errorf("Device with index %d not found", base.Index)
}
Beispiel #7
0
// LinkDel deletes link device. Either Index or Name must be set in
// the link object for it to be deleted. The other values are ignored.
// Equivalent to: `ip link del $link`
func LinkDel(link Link) error {
	base := link.Attrs()

	ensureIndex(base)

	req := nl.NewNetlinkRequest(syscall.RTM_DELLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	msg.Index = int32(base.Index)
	req.AddData(msg)

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #8
0
// LinkSetDown disables link device.
// Equivalent to: `ip link set $link down`
func LinkSetDown(link Link) error {
	base := link.Attrs()
	ensureIndex(base)
	req := nl.NewNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	msg.Change = syscall.IFF_UP
	msg.Flags = 0 & ^syscall.IFF_UP
	msg.Index = int32(base.Index)
	req.AddData(msg)

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #9
0
// LinkSetName sets the name of the link device.
// Equivalent to: `ip link set $link name $name`
func LinkSetName(link Link, name string) error {
	base := link.Attrs()
	ensureIndex(base)
	req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	msg.Index = int32(base.Index)
	req.AddData(msg)

	data := nl.NewRtAttr(syscall.IFLA_IFNAME, []byte(name))
	req.AddData(data)

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #10
0
// LinkSetHardwareAddr sets the hardware address of the link device.
// Equivalent to: `ip link set $link address $hwaddr`
func LinkSetHardwareAddr(link Link, hwaddr net.HardwareAddr) error {
	base := link.Attrs()
	ensureIndex(base)
	req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	msg.Index = int32(base.Index)
	req.AddData(msg)

	data := nl.NewRtAttr(syscall.IFLA_ADDRESS, []byte(hwaddr))
	req.AddData(data)

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #11
0
// FilterDel will delete a filter from the system.
// Equivalent to: `tc filter del $filter`
func FilterDel(filter Filter) error {
	req := nl.NewNetlinkRequest(syscall.RTM_DELTFILTER, syscall.NLM_F_ACK)
	base := filter.Attrs()
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: int32(base.LinkIndex),
		Handle:  base.Handle,
		Parent:  base.Parent,
		Info:    MakeHandle(base.Priority, nl.Swap16(base.Protocol)),
	}
	req.AddData(msg)

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #12
0
// LinkSetMTU sets the mtu of the link device.
// Equivalent to: `ip link set $link mtu $mtu`
func LinkSetMTU(link Link, mtu int) error {
	base := link.Attrs()
	ensureIndex(base)
	req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	msg.Index = int32(base.Index)
	req.AddData(msg)

	b := make([]byte, 4)
	native.PutUint32(b, uint32(mtu))

	data := nl.NewRtAttr(syscall.IFLA_MTU, b)
	req.AddData(data)

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #13
0
func setProtinfoAttr(link Link, mode bool, attr int) error {
	base := link.Attrs()
	ensureIndex(base)
	req := nl.NewNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
	msg.Index = int32(base.Index)
	req.AddData(msg)

	br := nl.NewRtAttr(syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED, nil)
	nl.NewRtAttrChild(br, attr, boolToByte(mode))
	req.AddData(br)
	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	if err != nil {
		return err
	}
	return nil
}
Beispiel #14
0
// XfrmStateAdd will add an xfrm state to the system.
// Equivalent to: `ip xfrm state add $state`
func XfrmStateAdd(state *XfrmState) error {
	// A state with spi 0 can't be deleted so don't allow it to be set
	if state.Spi == 0 {
		return fmt.Errorf("Spi must be set when adding xfrm state.")
	}
	req := nl.NewNetlinkRequest(nl.XFRM_MSG_NEWSA, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)

	msg := &nl.XfrmUsersaInfo{}
	msg.Family = uint16(nl.GetIPFamily(state.Dst))
	msg.Id.Daddr.FromIP(state.Dst)
	msg.Saddr.FromIP(state.Src)
	msg.Id.Proto = uint8(state.Proto)
	msg.Mode = uint8(state.Mode)
	msg.Id.Spi = nl.Swap32(uint32(state.Spi))
	msg.Reqid = uint32(state.Reqid)
	msg.ReplayWindow = uint8(state.ReplayWindow)
	msg.Lft.SoftByteLimit = nl.XFRM_INF
	msg.Lft.HardByteLimit = nl.XFRM_INF
	msg.Lft.SoftPacketLimit = nl.XFRM_INF
	msg.Lft.HardPacketLimit = nl.XFRM_INF
	req.AddData(msg)

	if state.Auth != nil {
		out := nl.NewRtAttr(nl.XFRMA_ALG_AUTH_TRUNC, writeStateAlgoAuth(state.Auth))
		req.AddData(out)
	}
	if state.Crypt != nil {
		out := nl.NewRtAttr(nl.XFRMA_ALG_CRYPT, writeStateAlgo(state.Crypt))
		req.AddData(out)
	}
	if state.Encap != nil {
		encapData := make([]byte, nl.SizeofXfrmEncapTmpl)
		encap := nl.DeserializeXfrmEncapTmpl(encapData)
		encap.EncapType = uint16(state.Encap.Type)
		encap.EncapSport = nl.Swap16(uint16(state.Encap.SrcPort))
		encap.EncapDport = nl.Swap16(uint16(state.Encap.DstPort))
		encap.EncapOa.FromIP(state.Encap.OriginalAddress)
		out := nl.NewRtAttr(nl.XFRMA_ENCAP, encapData)
		req.AddData(out)
	}

	_, err := req.Execute(syscall.NETLINK_XFRM, 0)
	return err
}
Beispiel #15
0
// XfrmStateDel will delete an xfrm state from the system. Note that
// the Algos are ignored when matching the state to delete.
// Equivalent to: `ip xfrm state del $state`
func XfrmStateDel(state *XfrmState) error {
	req := nl.NewNetlinkRequest(nl.XFRM_MSG_DELSA, syscall.NLM_F_ACK)

	msg := &nl.XfrmUsersaId{}
	msg.Daddr.FromIP(state.Dst)
	msg.Family = uint16(nl.GetIPFamily(state.Dst))
	msg.Proto = uint8(state.Proto)
	msg.Spi = nl.Swap32(uint32(state.Spi))
	req.AddData(msg)

	saddr := nl.XfrmAddress{}
	saddr.FromIP(state.Src)
	srcdata := nl.NewRtAttr(nl.XFRMA_SRCADDR, saddr.Serialize())

	req.AddData(srcdata)

	_, err := req.Execute(syscall.NETLINK_XFRM, 0)
	return err
}
Beispiel #16
0
func classModify(cmd, flags int, class Class) error {
	req := nl.NewNetlinkRequest(cmd, flags|syscall.NLM_F_ACK)
	base := class.Attrs()
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: int32(base.LinkIndex),
		Handle:  base.Handle,
		Parent:  base.Parent,
	}
	req.AddData(msg)

	if cmd != syscall.RTM_DELTCLASS {
		if err := classPayload(req, class); err != nil {
			return err
		}
	}
	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #17
0
func qdiscModify(cmd, flags int, qdisc Qdisc) error {
	req := nl.NewNetlinkRequest(cmd, flags|syscall.NLM_F_ACK)
	base := qdisc.Attrs()
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: int32(base.LinkIndex),
		Handle:  base.Handle,
		Parent:  base.Parent,
	}
	req.AddData(msg)

	// When deleting don't bother building the rest of the netlink payload
	if cmd != syscall.RTM_DELQDISC {
		if err := qdiscPayload(req, qdisc); err != nil {
			return err
		}
	}

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #18
0
// LinkByAlias finds a link by its alias and returns a pointer to the object.
// If there are multiple links with the alias it returns the first one
func LinkByAlias(alias string) (Link, error) {
	if lookupByDump {
		return linkByAliasDump(alias)
	}

	req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	req.AddData(msg)

	nameData := nl.NewRtAttr(syscall.IFLA_IFALIAS, nl.ZeroTerminated(alias))
	req.AddData(nameData)

	link, err := execGetLink(req)
	if err == syscall.EINVAL {
		// older kernels don't support looking up via IFLA_IFALIAS
		// so fall back to dumping all links
		lookupByDump = true
		return linkByAliasDump(alias)
	}

	return link, err
}
Beispiel #19
0
// LinkList gets a list of link devices.
// Equivalent to: `ip link show`
func LinkList() ([]Link, error) {
	// NOTE(vish): This duplicates functionality in net/iface_linux.go, but we need
	//             to get the message ourselves to parse link type.
	req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_DUMP)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	req.AddData(msg)

	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWLINK)
	if err != nil {
		return nil, err
	}

	var res []Link
	for _, m := range msgs {
		link, err := linkDeserialize(m)
		if err != nil {
			return nil, err
		}
		res = append(res, link)
	}

	return res, nil
}
Beispiel #20
0
// RouteGet gets a route to a specific destination from the host system.
// Equivalent to: 'ip route get'.
func RouteGet(destination net.IP) ([]Route, error) {
	req := nl.NewNetlinkRequest(syscall.RTM_GETROUTE, syscall.NLM_F_REQUEST)
	family := nl.GetIPFamily(destination)
	var destinationData []byte
	var bitlen uint8
	if family == FAMILY_V4 {
		destinationData = destination.To4()
		bitlen = 32
	} else {
		destinationData = destination.To16()
		bitlen = 128
	}
	msg := &nl.RtMsg{}
	msg.Family = uint8(family)
	msg.Dst_len = bitlen
	req.AddData(msg)

	rtaDst := nl.NewRtAttr(syscall.RTA_DST, destinationData)
	req.AddData(rtaDst)

	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWROUTE)
	if err != nil {
		return nil, err
	}

	var res []Route
	for _, m := range msgs {
		route, err := deserializeRoute(m)
		if err != nil {
			return nil, err
		}
		res = append(res, route)
	}
	return res, nil

}
Beispiel #21
0
// NeighDel will delete an IP address from a link device.
// Equivalent to: `ip addr del $addr dev $link`
func NeighDel(neigh *Neigh) error {
	req := nl.NewNetlinkRequest(syscall.RTM_DELNEIGH, syscall.NLM_F_ACK)
	return neighHandle(neigh, req)
}
Beispiel #22
0
// XfrmStateList gets a list of xfrm states in the system.
// Equivalent to: `ip xfrm state show`.
// The list can be filtered by ip family.
func XfrmStateList(family int) ([]XfrmState, error) {
	req := nl.NewNetlinkRequest(nl.XFRM_MSG_GETSA, syscall.NLM_F_DUMP)

	msg := nl.NewIfInfomsg(family)
	req.AddData(msg)

	msgs, err := req.Execute(syscall.NETLINK_XFRM, nl.XFRM_MSG_NEWSA)
	if err != nil {
		return nil, err
	}

	var res []XfrmState
	for _, m := range msgs {
		msg := nl.DeserializeXfrmUsersaInfo(m)

		if family != FAMILY_ALL && family != int(msg.Family) {
			continue
		}

		var state XfrmState

		state.Dst = msg.Id.Daddr.ToIP()
		state.Src = msg.Saddr.ToIP()
		state.Proto = Proto(msg.Id.Proto)
		state.Mode = Mode(msg.Mode)
		state.Spi = int(nl.Swap32(msg.Id.Spi))
		state.Reqid = int(msg.Reqid)
		state.ReplayWindow = int(msg.ReplayWindow)

		attrs, err := nl.ParseRouteAttr(m[msg.Len():])
		if err != nil {
			return nil, err
		}

		for _, attr := range attrs {
			switch attr.Attr.Type {
			case nl.XFRMA_ALG_AUTH, nl.XFRMA_ALG_CRYPT:
				var resAlgo *XfrmStateAlgo
				if attr.Attr.Type == nl.XFRMA_ALG_AUTH {
					if state.Auth == nil {
						state.Auth = new(XfrmStateAlgo)
					}
					resAlgo = state.Auth
				} else {
					state.Crypt = new(XfrmStateAlgo)
					resAlgo = state.Crypt
				}
				algo := nl.DeserializeXfrmAlgo(attr.Value[:])
				(*resAlgo).Name = nl.BytesToString(algo.AlgName[:])
				(*resAlgo).Key = algo.AlgKey
			case nl.XFRMA_ALG_AUTH_TRUNC:
				if state.Auth == nil {
					state.Auth = new(XfrmStateAlgo)
				}
				algo := nl.DeserializeXfrmAlgoAuth(attr.Value[:])
				state.Auth.Name = nl.BytesToString(algo.AlgName[:])
				state.Auth.Key = algo.AlgKey
				state.Auth.TruncateLen = int(algo.AlgTruncLen)
			case nl.XFRMA_ENCAP:
				encap := nl.DeserializeXfrmEncapTmpl(attr.Value[:])
				state.Encap = new(XfrmStateEncap)
				state.Encap.Type = EncapType(encap.EncapType)
				state.Encap.SrcPort = int(nl.Swap16(encap.EncapSport))
				state.Encap.DstPort = int(nl.Swap16(encap.EncapDport))
				state.Encap.OriginalAddress = encap.EncapOa.ToIP()
			}

		}
		res = append(res, state)
	}
	return res, nil
}
Beispiel #23
0
// LinkAdd adds a new link device. The type and features of the device
// are taken fromt the parameters in the link object.
// Equivalent to: `ip link add $link`
func LinkAdd(link Link) error {
	// TODO: set mtu and hardware address
	// TODO: support extra data for macvlan
	base := link.Attrs()

	if base.Name == "" {
		return fmt.Errorf("LinkAttrs.Name cannot be empty!")
	}

	if tuntap, ok := link.(*Tuntap); ok {
		// TODO: support user
		// TODO: support group
		// TODO: support non- one_queue
		// TODO: support pi | vnet_hdr | multi_queue
		// TODO: support non- exclusive
		// TODO: support non- persistent
		if tuntap.Mode < syscall.IFF_TUN || tuntap.Mode > syscall.IFF_TAP {
			return fmt.Errorf("Tuntap.Mode %v unknown!", tuntap.Mode)
		}
		file, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
		if err != nil {
			return err
		}
		defer file.Close()
		var req ifReq
		req.Flags |= syscall.IFF_ONE_QUEUE
		req.Flags |= syscall.IFF_TUN_EXCL
		copy(req.Name[:15], base.Name)
		req.Flags |= uint16(tuntap.Mode)
		_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, file.Fd(), uintptr(syscall.TUNSETIFF), uintptr(unsafe.Pointer(&req)))
		if errno != 0 {
			return fmt.Errorf("Tuntap IOCTL TUNSETIFF failed, errno %v", errno)
		}
		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL, file.Fd(), uintptr(syscall.TUNSETPERSIST), 1)
		if errno != 0 {
			return fmt.Errorf("Tuntap IOCTL TUNSETPERSIST failed, errno %v", errno)
		}
		ensureIndex(base)

		// can't set master during create, so set it afterwards
		if base.MasterIndex != 0 {
			// TODO: verify MasterIndex is actually a bridge?
			return LinkSetMasterByIndex(link, base.MasterIndex)
		}
		return nil
	}

	req := nl.NewNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)

	msg := nl.NewIfInfomsg(syscall.AF_UNSPEC)
	// TODO: make it shorter
	if base.Flags&FlagUp != 0 {
		msg.Change = syscall.IFF_UP
		msg.Flags = syscall.IFF_UP
	}
	if base.Flags&FlagBroadcast != 0 {
		msg.Change |= syscall.IFF_BROADCAST
		msg.Flags |= syscall.IFF_BROADCAST
	}
	if base.Flags&FlagLoopback != 0 {
		msg.Change |= syscall.IFF_LOOPBACK
		msg.Flags |= syscall.IFF_LOOPBACK
	}
	if base.Flags&FlagPointToPoint != 0 {
		msg.Change |= syscall.IFF_POINTOPOINT
		msg.Flags |= syscall.IFF_POINTOPOINT
	}
	if base.Flags&FlagMulticast != 0 {
		msg.Change |= syscall.IFF_MULTICAST
		msg.Flags |= syscall.IFF_MULTICAST
	}
	if base.Flags&FlagRunning != 0 {
		msg.Change |= syscall.IFF_RUNNING
		msg.Flags |= syscall.IFF_RUNNING
	}
	req.AddData(msg)

	if base.ParentIndex != 0 {
		b := make([]byte, 4)
		native.PutUint32(b, uint32(base.ParentIndex))
		data := nl.NewRtAttr(syscall.IFLA_LINK, b)
		req.AddData(data)
	} else if link.Type() == "ipvlan" {
		return fmt.Errorf("Can't create ipvlan link without ParentIndex")
	}

	nameData := nl.NewRtAttr(syscall.IFLA_IFNAME, nl.ZeroTerminated(base.Name))
	req.AddData(nameData)

	if base.MTU > 0 {
		mtu := nl.NewRtAttr(syscall.IFLA_MTU, nl.Uint32Attr(uint32(base.MTU)))
		req.AddData(mtu)
	}

	if base.TxQLen >= 0 {
		qlen := nl.NewRtAttr(syscall.IFLA_TXQLEN, nl.Uint32Attr(uint32(base.TxQLen)))
		req.AddData(qlen)
	}

	if base.Namespace != nil {
		var attr *nl.RtAttr
		switch base.Namespace.(type) {
		case NsPid:
			val := nl.Uint32Attr(uint32(base.Namespace.(NsPid)))
			attr = nl.NewRtAttr(syscall.IFLA_NET_NS_PID, val)
		case NsFd:
			val := nl.Uint32Attr(uint32(base.Namespace.(NsFd)))
			attr = nl.NewRtAttr(nl.IFLA_NET_NS_FD, val)
		}

		req.AddData(attr)
	}

	linkInfo := nl.NewRtAttr(syscall.IFLA_LINKINFO, nil)
	nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_KIND, nl.NonZeroTerminated(link.Type()))

	if vlan, ok := link.(*Vlan); ok {
		b := make([]byte, 2)
		native.PutUint16(b, uint16(vlan.VlanId))
		data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
		nl.NewRtAttrChild(data, nl.IFLA_VLAN_ID, b)
	} else if veth, ok := link.(*Veth); ok {
		data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
		peer := nl.NewRtAttrChild(data, nl.VETH_INFO_PEER, nil)
		nl.NewIfInfomsgChild(peer, syscall.AF_UNSPEC)
		nl.NewRtAttrChild(peer, syscall.IFLA_IFNAME, nl.ZeroTerminated(veth.PeerName))
		if base.TxQLen >= 0 {
			nl.NewRtAttrChild(peer, syscall.IFLA_TXQLEN, nl.Uint32Attr(uint32(base.TxQLen)))
		}
		if base.MTU > 0 {
			nl.NewRtAttrChild(peer, syscall.IFLA_MTU, nl.Uint32Attr(uint32(base.MTU)))
		}

	} else if vxlan, ok := link.(*Vxlan); ok {
		addVxlanAttrs(vxlan, linkInfo)
	} else if bond, ok := link.(*Bond); ok {
		addBondAttrs(bond, linkInfo)
	} else if ipv, ok := link.(*IPVlan); ok {
		data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
		nl.NewRtAttrChild(data, nl.IFLA_IPVLAN_MODE, nl.Uint16Attr(uint16(ipv.Mode)))
	} else if macv, ok := link.(*Macvlan); ok {
		if macv.Mode != MACVLAN_MODE_DEFAULT {
			data := nl.NewRtAttrChild(linkInfo, nl.IFLA_INFO_DATA, nil)
			nl.NewRtAttrChild(data, nl.IFLA_MACVLAN_MODE, nl.Uint32Attr(macvlanModes[macv.Mode]))
		}
	} else if gretap, ok := link.(*Gretap); ok {
		addGretapAttrs(gretap, linkInfo)
	}

	req.AddData(linkInfo)

	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	if err != nil {
		return err
	}

	ensureIndex(base)

	// can't set master during create, so set it afterwards
	if base.MasterIndex != 0 {
		// TODO: verify MasterIndex is actually a bridge?
		return LinkSetMasterByIndex(link, base.MasterIndex)
	}
	return nil
}
Beispiel #24
0
// QdiscList gets a list of qdiscs in the system.
// Equivalent to: `tc qdisc show`.
// The list can be filtered by link.
func QdiscList(link Link) ([]Qdisc, error) {
	req := nl.NewNetlinkRequest(syscall.RTM_GETQDISC, syscall.NLM_F_DUMP)
	index := int32(0)
	if link != nil {
		base := link.Attrs()
		ensureIndex(base)
		index = int32(base.Index)
	}
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: index,
	}
	req.AddData(msg)

	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWQDISC)
	if err != nil {
		return nil, err
	}

	var res []Qdisc
	for _, m := range msgs {
		msg := nl.DeserializeTcMsg(m)

		attrs, err := nl.ParseRouteAttr(m[msg.Len():])
		if err != nil {
			return nil, err
		}

		// skip qdiscs from other interfaces
		if link != nil && msg.Ifindex != index {
			continue
		}

		base := QdiscAttrs{
			LinkIndex: int(msg.Ifindex),
			Handle:    msg.Handle,
			Parent:    msg.Parent,
			Refcnt:    msg.Info,
		}
		var qdisc Qdisc
		qdiscType := ""
		for _, attr := range attrs {
			switch attr.Attr.Type {
			case nl.TCA_KIND:
				qdiscType = string(attr.Value[:len(attr.Value)-1])
				switch qdiscType {
				case "pfifo_fast":
					qdisc = &PfifoFast{}
				case "prio":
					qdisc = &Prio{}
				case "tbf":
					qdisc = &Tbf{}
				case "ingress":
					qdisc = &Ingress{}
				case "htb":
					qdisc = &Htb{}
				case "netem":
					qdisc = &Netem{}
				default:
					qdisc = &GenericQdisc{QdiscType: qdiscType}
				}
			case nl.TCA_OPTIONS:
				switch qdiscType {
				case "pfifo_fast":
					// pfifo returns TcPrioMap directly without wrapping it in rtattr
					if err := parsePfifoFastData(qdisc, attr.Value); err != nil {
						return nil, err
					}
				case "prio":
					// prio returns TcPrioMap directly without wrapping it in rtattr
					if err := parsePrioData(qdisc, attr.Value); err != nil {
						return nil, err
					}
				case "tbf":
					data, err := nl.ParseRouteAttr(attr.Value)
					if err != nil {
						return nil, err
					}
					if err := parseTbfData(qdisc, data); err != nil {
						return nil, err
					}
				case "htb":
					data, err := nl.ParseRouteAttr(attr.Value)
					if err != nil {
						return nil, err
					}
					if err := parseHtbData(qdisc, data); err != nil {
						return nil, err
					}
				case "netem":
					if err := parseNetemData(qdisc, attr.Value); err != nil {
						return nil, err
					}

					// no options for ingress
				}
			}
		}
		*qdisc.Attrs() = base
		res = append(res, qdisc)
	}

	return res, nil
}
Beispiel #25
0
// RuleList lists rules in the system.
// Equivalent to: ip rule list
func RuleList(family int) ([]Rule, error) {
	req := nl.NewNetlinkRequest(syscall.RTM_GETRULE, syscall.NLM_F_DUMP|syscall.NLM_F_REQUEST)
	msg := nl.NewIfInfomsg(family)
	req.AddData(msg)

	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWRULE)
	if err != nil {
		return nil, err
	}

	native := nl.NativeEndian()
	var res = make([]Rule, 0)
	for i := range msgs {
		msg := nl.DeserializeRtMsg(msgs[i])
		attrs, err := nl.ParseRouteAttr(msgs[i][msg.Len():])
		if err != nil {
			return nil, err
		}

		rule := NewRule()
		rule.RtMsg = msg

		for j := range attrs {
			switch attrs[j].Attr.Type {
			case syscall.RTA_TABLE:
				rule.Table = int(native.Uint32(attrs[j].Value[0:4]))
			case nl.FRA_SRC:
				rule.Src = &net.IPNet{
					IP:   attrs[j].Value,
					Mask: net.CIDRMask(int(msg.Src_len), 8*len(attrs[j].Value)),
				}
			case nl.FRA_DST:
				rule.Dst = &net.IPNet{
					IP:   attrs[j].Value,
					Mask: net.CIDRMask(int(msg.Dst_len), 8*len(attrs[j].Value)),
				}
			case nl.FRA_FWMARK:
				rule.Mark = int(native.Uint32(attrs[j].Value[0:4]))
			case nl.FRA_FWMASK:
				rule.Mask = int(native.Uint32(attrs[j].Value[0:4]))
			case nl.FRA_TUN_ID:
				rule.TunID = uint(native.Uint64(attrs[j].Value[0:4]))
			case nl.FRA_IIFNAME:
				rule.IifName = string(attrs[j].Value[:len(attrs[j].Value)-1])
			case nl.FRA_OIFNAME:
				rule.OifName = string(attrs[j].Value[:len(attrs[j].Value)-1])
			case nl.FRA_SUPPRESS_PREFIXLEN:
				i := native.Uint32(attrs[j].Value[0:4])
				if i != 0xffffffff {
					rule.SuppressPrefixlen = int(i)
				}
			case nl.FRA_SUPPRESS_IFGROUP:
				i := native.Uint32(attrs[j].Value[0:4])
				if i != 0xffffffff {
					rule.SuppressIfgroup = int(i)
				}
			case nl.FRA_FLOW:
				rule.Flow = int(native.Uint32(attrs[j].Value[0:4]))
			case nl.FRA_GOTO:
				rule.Goto = int(native.Uint32(attrs[j].Value[0:4]))
			case nl.FRA_PRIORITY:
				rule.Priority = int(native.Uint32(attrs[j].Value[0:4]))
			}
		}
		res = append(res, *rule)
	}

	return res, nil
}
Beispiel #26
0
// FilterAdd will add a filter to the system.
// Equivalent to: `tc filter add $filter`
func FilterAdd(filter Filter) error {
	native = nl.NativeEndian()
	req := nl.NewNetlinkRequest(syscall.RTM_NEWTFILTER, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
	base := filter.Attrs()
	msg := &nl.TcMsg{
		Family:  nl.FAMILY_ALL,
		Ifindex: int32(base.LinkIndex),
		Handle:  base.Handle,
		Parent:  base.Parent,
		Info:    MakeHandle(base.Priority, nl.Swap16(base.Protocol)),
	}
	req.AddData(msg)
	req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(filter.Type())))

	options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
	if u32, ok := filter.(*U32); ok {
		// match all
		sel := nl.TcU32Sel{
			Nkeys: 1,
			Flags: nl.TC_U32_TERMINAL,
		}
		sel.Keys = append(sel.Keys, nl.TcU32Key{})
		nl.NewRtAttrChild(options, nl.TCA_U32_SEL, sel.Serialize())
		actions := nl.NewRtAttrChild(options, nl.TCA_U32_ACT, nil)
		table := nl.NewRtAttrChild(actions, nl.TCA_ACT_TAB, nil)
		nl.NewRtAttrChild(table, nl.TCA_KIND, nl.ZeroTerminated("mirred"))
		// redirect to other interface
		mir := nl.TcMirred{
			Action:  nl.TC_ACT_STOLEN,
			Eaction: nl.TCA_EGRESS_REDIR,
			Ifindex: uint32(u32.RedirIndex),
		}
		aopts := nl.NewRtAttrChild(table, nl.TCA_OPTIONS, nil)
		nl.NewRtAttrChild(aopts, nl.TCA_MIRRED_PARMS, mir.Serialize())
	} else if fw, ok := filter.(*Fw); ok {
		if fw.Mask != 0 {
			b := make([]byte, 4)
			native.PutUint32(b, fw.Mask)
			nl.NewRtAttrChild(options, nl.TCA_FW_MASK, b)
		}
		if fw.InDev != "" {
			nl.NewRtAttrChild(options, nl.TCA_FW_INDEV, nl.ZeroTerminated(fw.InDev))
		}
		if (fw.Police != nl.TcPolice{}) {

			police := nl.NewRtAttrChild(options, nl.TCA_FW_POLICE, nil)
			nl.NewRtAttrChild(police, nl.TCA_POLICE_TBF, fw.Police.Serialize())
			if (fw.Police.Rate != nl.TcRateSpec{}) {
				payload := SerializeRtab(fw.Rtab)
				nl.NewRtAttrChild(police, nl.TCA_POLICE_RATE, payload)
			}
			if (fw.Police.PeakRate != nl.TcRateSpec{}) {
				payload := SerializeRtab(fw.Ptab)
				nl.NewRtAttrChild(police, nl.TCA_POLICE_PEAKRATE, payload)
			}
		}
		if fw.ClassId != 0 {
			b := make([]byte, 4)
			native.PutUint32(b, fw.ClassId)
			nl.NewRtAttrChild(options, nl.TCA_FW_CLASSID, b)
		}
	}

	req.AddData(options)
	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
	return err
}
Beispiel #27
0
// RuleDel deletes a rule from the system.
// Equivalent to: ip rule del
func RuleDel(rule *Rule) error {
	req := nl.NewNetlinkRequest(syscall.RTM_DELRULE, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
	return ruleHandle(rule, req)
}
Beispiel #28
0
// FilterList gets a list of filters in the system.
// Equivalent to: `tc filter show`.
// Generally retunrs nothing if link and parent are not specified.
func FilterList(link Link, parent uint32) ([]Filter, error) {
	req := nl.NewNetlinkRequest(syscall.RTM_GETTFILTER, syscall.NLM_F_DUMP)
	msg := &nl.TcMsg{
		Family: nl.FAMILY_ALL,
		Parent: parent,
	}
	if link != nil {
		base := link.Attrs()
		ensureIndex(base)
		msg.Ifindex = int32(base.Index)
	}
	req.AddData(msg)

	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWTFILTER)
	if err != nil {
		return nil, err
	}

	var res []Filter
	for _, m := range msgs {
		msg := nl.DeserializeTcMsg(m)

		attrs, err := nl.ParseRouteAttr(m[msg.Len():])
		if err != nil {
			return nil, err
		}

		base := FilterAttrs{
			LinkIndex: int(msg.Ifindex),
			Handle:    msg.Handle,
			Parent:    msg.Parent,
		}
		base.Priority, base.Protocol = MajorMinor(msg.Info)
		base.Protocol = nl.Swap16(base.Protocol)

		var filter Filter
		filterType := ""
		detailed := false
		for _, attr := range attrs {
			switch attr.Attr.Type {
			case nl.TCA_KIND:
				filterType = string(attr.Value[:len(attr.Value)-1])
				switch filterType {
				case "u32":
					filter = &U32{}
				case "fw":
					filter = &Fw{}
				default:
					filter = &GenericFilter{FilterType: filterType}
				}
			case nl.TCA_OPTIONS:
				switch filterType {
				case "u32":
					data, err := nl.ParseRouteAttr(attr.Value)
					if err != nil {
						return nil, err
					}
					detailed, err = parseU32Data(filter, data)
					if err != nil {
						return nil, err
					}
				case "fw":
					data, err := nl.ParseRouteAttr(attr.Value)
					if err != nil {
						return nil, err
					}
					detailed, err = parseFwData(filter, data)
					if err != nil {
						return nil, err
					}
				}
			}
		}
		// only return the detailed version of the filter
		if detailed {
			*filter.Attrs() = base
			res = append(res, filter)
		}
	}

	return res, nil
}
Beispiel #29
0
func neighAdd(neigh *Neigh, mode int) error {
	req := nl.NewNetlinkRequest(syscall.RTM_NEWNEIGH, mode|syscall.NLM_F_ACK)
	return neighHandle(neigh, req)
}
Beispiel #30
0
// ClassList gets a list of classes in the system.
// Equivalent to: `tc class show`.
// Generally returns nothing if link and parent are not specified.
func ClassList(link Link, parent uint32) ([]Class, error) {
	req := nl.NewNetlinkRequest(syscall.RTM_GETTCLASS, syscall.NLM_F_DUMP)
	msg := &nl.TcMsg{
		Family: nl.FAMILY_ALL,
		Parent: parent,
	}
	if link != nil {
		base := link.Attrs()
		ensureIndex(base)
		msg.Ifindex = int32(base.Index)
	}
	req.AddData(msg)

	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWTCLASS)
	if err != nil {
		return nil, err
	}

	var res []Class
	for _, m := range msgs {
		msg := nl.DeserializeTcMsg(m)

		attrs, err := nl.ParseRouteAttr(m[msg.Len():])
		if err != nil {
			return nil, err
		}

		base := ClassAttrs{
			LinkIndex: int(msg.Ifindex),
			Handle:    msg.Handle,
			Parent:    msg.Parent,
		}

		var class Class
		classType := ""
		for _, attr := range attrs {
			switch attr.Attr.Type {
			case nl.TCA_KIND:
				classType = string(attr.Value[:len(attr.Value)-1])
				switch classType {
				case "htb":
					class = &HtbClass{}
				default:
					class = &GenericClass{ClassType: classType}
				}
			case nl.TCA_OPTIONS:
				switch classType {
				case "htb":
					data, err := nl.ParseRouteAttr(attr.Value)
					if err != nil {
						return nil, err
					}
					_, err = parseHtbClassData(class, data)
					if err != nil {
						return nil, err
					}
				}
			}
		}
		*class.Attrs() = base
		res = append(res, class)
	}

	return res, nil
}