Commit 0c5c2d30 authored Mar 04, 2009 by Eric Biederman Committed by David S. Miller Mar 04, 2009

neigh: Allow for user space users of the neighbour table

Currently it is possible to do just about everything with the arp table
from user space except treat an entry like you are using it. To that end
implement and a flag NTF_USE that when set in a netwlink update request
treats the neighbour table entry like the kernel does on the output path.

This allows user space applications to share the kernel's arp cache.

Signed-off-by: Eric Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent fc1f9ea5

include/linux/neighbour.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,7 @@ enum
		* Neighbor Cache Entry Flags
		*/

		#define NTF_USE 0x01
		#define NTF_PROXY 0x08 /* == ATF_PUBL */
		#define NTF_ROUTER 0x80

net/core/neighbour.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -1654,6 +1654,10 @@ static int neigh_add(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
		flags &= ~NEIGH_UPDATE_F_OVERRIDE;
		}

		if (ndm->ndm_flags & NTF_USE) {
		neigh_event_send(neigh, NULL);
		err = 0;
		} else
		err = neigh_update(neigh, lladdr, ndm->ndm_state, flags);
		neigh_release(neigh);
		goto out_dev_put;