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@xxxxxxxxxxxxxxxxxx>
---
include/linux/neighbour.h | 1 +
net/core/neighbour.c | 6 +++++-
2 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/include/linux/neighbour.h b/include/linux/neighbour.h
index 8730d5d..12c9de1 100644
--- a/include/linux/neighbour.h
+++ b/include/linux/neighbour.h
@@ -31,6 +31,7 @@ enum
* Neighbor Cache Entry Flags
*/
+#define NTF_USE 0x01
#define NTF_PROXY 0x08 /* == ATF_PUBL */
#define NTF_ROUTER 0x80
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 278a142..0fc92ed 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1656,7 +1656,11 @@ 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;
}
--
1.6.1.2.350.g88cc
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