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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
