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TLV Update: handle update RouterID (R Flag)

This commit is contained in:
Johannes Kimmel 2021-12-13 08:45:58 +01:00
parent ff695a5956
commit 7283f52d41
1 changed files with 18 additions and 2 deletions
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20
tlv/tlv.go
View File

@ -508,6 +508,7 @@ type Update struct {
Interval uint16
Seqno uint16
Metric uint16
RouterID RouterID
Prefix netaddr.IPPrefix
NextHop netaddr.IP
}
@ -521,8 +522,8 @@ func (u Update) L() uint8 {
}
func (u Update) FormatHeader() string {
return fmt.Sprintf("Flags 0x%02x Omitted %2d Interval %4d Seqno %5d Metric %5d NextHop %s",
u.Flags, u.Omitted, u.Interval, u.Seqno, u.Metric, u.NextHop,
return fmt.Sprintf("Flags 0x%02x Omitted %2d Interval %4d Seqno %5d Metric %5d RouterID %s",
u.Flags, u.Omitted, u.Interval, u.Seqno, u.Metric, u.RouterID,
)
}
@ -561,6 +562,21 @@ func (s *PacketDecoder) UpdateFromBytes(b []byte) (Update, []byte, error) {
u.NextHop = s.nexthopv6
}
if u.Flags&0x40 > 0 {
addr := u.Prefix.IP()
switch {
case addr.Is6():
v6 := addr.As16()
copy(s.routerID[:], v6[8:])
case addr.Is4():
s.routerID = RouterID{}
v4 := addr.As4()
copy(s.routerID[4:], v4[:])
}
}
u.RouterID = s.routerID
return u, b, err
}