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neighbour: support for NTF_EXT_LEARNED flag

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This patch extends NTF_EXT_LEARNED support to the neighbour system.
Example use-case: An Ethernet VPN implementation (eg in FRR routing suite)
can use this flag to add dynamic reachable external neigh entires
learned via control plane. The use of neigh NTF_EXT_LEARNED in this
patch is consistent with its use with bridge and vxlan fdb entries.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu
2018-04-24 13:49:34 -07:00
committed by David S. Miller
parent 0aef78aa7b
commit 9ce33e4653
2 changed files with 24 additions and 1 deletions
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8
net/core/neighbour.c
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@@ -820,7 +820,8 @@ static void neigh_periodic_work(struct work_struct *work)
write_lock(&n->lock);
state = n->nud_state;
if (state & (NUD_PERMANENT | NUD_IN_TIMER)) {
if ((state & (NUD_PERMANENT | NUD_IN_TIMER)) ||
(n->flags & NTF_EXT_LEARNED)) {
write_unlock(&n->lock);
goto next_elt;
}
@@ -1136,6 +1137,8 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
if (neigh->dead)
goto out;
neigh_update_ext_learned(neigh, flags, &notify);
if (!(new & NUD_VALID)) {
neigh_del_timer(neigh);
if (old & NUD_CONNECTED)
@@ -1781,6 +1784,9 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
flags &= ~NEIGH_UPDATE_F_OVERRIDE;
}
if (ndm->ndm_flags & NTF_EXT_LEARNED)
flags |= NEIGH_UPDATE_F_EXT_LEARNED;
if (ndm->ndm_flags & NTF_USE) {
neigh_event_send(neigh, NULL);
err = 0;