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neigh: Allow for user space users of the neighbour table

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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
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
include/linux/neighbour.h
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@ -31,6 +31,7 @@ enum
* Neighbor Cache Entry Flags * Neighbor Cache Entry Flags
*/ */
#define NTF_USE 0x01
#define NTF_PROXY 0x08 /* == ATF_PUBL */ #define NTF_PROXY 0x08 /* == ATF_PUBL */
#define NTF_ROUTER 0x80 #define NTF_ROUTER 0x80

4
net/core/neighbour.c
View file

@ -1654,6 +1654,10 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
flags &= ~NEIGH_UPDATE_F_OVERRIDE; 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); err = neigh_update(neigh, lladdr, ndm->ndm_state, flags);
neigh_release(neigh); neigh_release(neigh);
goto out_dev_put; goto out_dev_put;