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fix prefixlen/local IP, incl. PtP addresses

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From libnl addr.c comment:
IPv6 sends the local address as IFA_ADDRESS with no
IFA_LOCAL, IPv4 sends both IFA_LOCAL and IFA_ADDRESS
with IFA_ADDRESS being the peer address if they differ

But obviously, IPv6 sends IFA_LOCAL in case of PtP.

From iproute2 manual:
If a peer address is specified, the local address
cannot have a prefix length. The network prefix is
associated with the peer rather than with the local
address.
This commit is contained in:
semicomplete
2018-06-13 17:13:18 +02:00
committed by Vish (Ishaya) Abrams
parent 7c0b5944a3
commit b1cc70dea2
2 changed files with 28 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
addr_linux.go
View File

@@ -65,7 +65,11 @@ func (h *Handle) addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error
msg := nl.NewIfAddrmsg(family)
msg.Index = uint32(base.Index)
msg.Scope = uint8(addr.Scope)
prefixlen, masklen := addr.Mask.Size()
mask := addr.Mask
if addr.Peer != nil {
mask = addr.Peer.Mask
}
prefixlen, masklen := mask.Size()
msg.Prefixlen = uint8(prefixlen)
req.AddData(msg)
@@ -107,7 +111,7 @@ func (h *Handle) addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error
if addr.Broadcast == nil {
calcBroadcast := make(net.IP, masklen/8)
for i := range localAddrData {
calcBroadcast[i] = localAddrData[i] | ^addr.Mask[i]
calcBroadcast[i] = localAddrData[i] | ^mask[i]
}
addr.Broadcast = calcBroadcast
}
@@ -206,13 +210,17 @@ func parseAddr(m []byte) (addr Addr, family, index int, err error) {
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
}
addr.Peer = dst
case unix.IFA_LOCAL:
// iproute2 manual:
// If a peer address is specified, the local address
// cannot have a prefix length. The network prefix is
// associated with the peer rather than with the local
// address.
n := 8 * len(attr.Value)
local = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
Mask: net.CIDRMask(n, n),
}
addr.IPNet = local
case unix.IFA_BROADCAST:
addr.Broadcast = attr.Value
case unix.IFA_LABEL:
@@ -226,12 +234,24 @@ func parseAddr(m []byte) (addr Addr, family, index int, err error) {
}
}
// IFA_LOCAL should be there but if not, fall back to IFA_ADDRESS
// libnl addr.c comment:
// IPv6 sends the local address as IFA_ADDRESS with no
// IFA_LOCAL, IPv4 sends both IFA_LOCAL and IFA_ADDRESS
// with IFA_ADDRESS being the peer address if they differ
//
// But obviously, as there are IPv6 PtP addresses, too,
// IFA_LOCAL should also be handled for IPv6.
if local != nil {
addr.IPNet = local
if family == FAMILY_V4 && local.IP.Equal(dst.IP) {
addr.IPNet = dst
} else {
addr.IPNet = local
addr.Peer = dst
}
} else {
addr.IPNet = dst
}
addr.Scope = int(msg.Scope)
return

2
addr_test.go
View File

@@ -24,7 +24,7 @@ func DoTestAddr(t *testing.T, FunctionUndertest func(Link, *Addr) error) {
t.Skipf("Fails in travis with: addr_test.go:68: Address flags not set properly, got=0, expected=128")
}
// TODO: IFA_F_PERMANENT does not seem to be set by default on older kernels?
var address = &net.IPNet{IP: net.IPv4(127, 0, 0, 2), Mask: net.CIDRMask(24, 32)}
var address = &net.IPNet{IP: net.IPv4(127, 0, 0, 2), Mask: net.CIDRMask(32, 32)}
var peer = &net.IPNet{IP: net.IPv4(127, 0, 0, 3), Mask: net.CIDRMask(24, 32)}
var addrTests = []struct {
addr *Addr