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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>
This commit is contained in:
Eric Biederman 2009-03-04 00:03:08 -08:00 committed by David S. Miller
parent fc1f9ea51d
commit 0c5c2d3089
2 changed files with 6 additions and 1 deletions
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1
include/linux/neighbour.h
View File

@ -31,6 +31,7 @@ enum
* Neighbor Cache Entry Flags
*/
#define NTF_USE 0x01
#define NTF_PROXY 0x08 /* == ATF_PUBL */
#define NTF_ROUTER 0x80

6
net/core/neighbour.c
View File

@ -1654,7 +1654,11 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
flags &= ~NEIGH_UPDATE_F_OVERRIDE;
}
err = neigh_update(neigh, lladdr, ndm->ndm_state, flags);
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;
}