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Add support for ARP/ND Timestamps when retriving neighbors

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On Linux, Netlink provides NDA_CACHEINFO which carries timestamps about
when ARP/ND was updated, used, and confirmed.

Expose these fields in the Neigh type
This commit is contained in:
James Lamanna
2024-12-14 17:39:36 -08:00
committed by Alessandro Boch
parent 8b05c6bd4c
commit 7740709424
2 changed files with 12 additions and 0 deletions
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8
neigh.go
View File

@@ -19,6 +19,14 @@ type Neigh struct {
Vlan int
VNI int
MasterIndex int
// These values are expressed as "clock ticks ago". To
// convert these clock ticks to seconds divide by sysconf(_SC_CLK_TCK).
// When _SC_CLK_TCK is 100, for example, the ndm_* times are expressed
// in centiseconds.
Confirmed uint32 // The last time ARP/ND succeeded OR higher layer confirmation was received
Used uint32 // The last time ARP/ND took place for this neighbor
Updated uint32 // The time when the current NUD state was entered
}
// String returns $ip/$hwaddr $label

4
neigh_linux.go
View File

@@ -349,6 +349,10 @@ func NeighDeserialize(m []byte) (*Neigh, error) {
neigh.VNI = int(native.Uint32(attr.Value[0:4]))
case NDA_MASTER:
neigh.MasterIndex = int(native.Uint32(attr.Value[0:4]))
case NDA_CACHEINFO:
neigh.Confirmed = native.Uint32(attr.Value[0:4])
neigh.Used = native.Uint32(attr.Value[4:8])
neigh.Updated = native.Uint32(attr.Value[8:12])
}
}