linux-kernel - [PATCH] mctp: Remove only static neighbour on RTM

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Date:   Tue, 28 Dec 2021 18:39:56 +0530
From:   Gagan Kumar <gagan1kumar.cs@...il.com>
To:     jk@...econstruct.com.au, matt@...econstruct.com.au,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gagan Kumar <gagan1kumar.cs@...il.com>
Subject: [PATCH] mctp: Remove only static neighbour on RTM_DELNEIGH

Add neighbour source flag in mctp_neigh_remove(...) to allow removal of
only static neighbours.

Signed-off-by: Gagan Kumar <gagan1kumar.cs@...il.com>
---
 net/mctp/neigh.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/mctp/neigh.c b/net/mctp/neigh.c
index 5cc042121493..a90723ae66d7 100644
--- a/net/mctp/neigh.c
+++ b/net/mctp/neigh.c
@@ -85,8 +85,8 @@ void mctp_neigh_remove_dev(struct mctp_dev *mdev)
 	mutex_unlock(&net->mctp.neigh_lock);
 }
 
-// TODO: add a "source" flag so netlink can only delete static neighbours?
-static int mctp_neigh_remove(struct mctp_dev *mdev, mctp_eid_t eid)
+static int mctp_neigh_remove(struct mctp_dev *mdev, mctp_eid_t eid,
+			     enum mctp_neigh_source source)
 {
 	struct net *net = dev_net(mdev->dev);
 	struct mctp_neigh *neigh, *tmp;
@@ -94,7 +94,7 @@ static int mctp_neigh_remove(struct mctp_dev *mdev, mctp_eid_t eid)
 
 	mutex_lock(&net->mctp.neigh_lock);
 	list_for_each_entry_safe(neigh, tmp, &net->mctp.neighbours, list) {
-		if (neigh->dev == mdev && neigh->eid == eid) {
+		if (neigh->dev == mdev && neigh->eid == eid && neigh->source == source) {
 			list_del_rcu(&neigh->list);
 			/* TODO: immediate RTM_DELNEIGH */
 			call_rcu(&neigh->rcu, __mctp_neigh_free);
@@ -202,7 +202,7 @@ static int mctp_rtm_delneigh(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (!mdev)
 		return -ENODEV;
 
-	return mctp_neigh_remove(mdev, eid);
+	return mctp_neigh_remove(mdev, eid, MCTP_NEIGH_STATIC);
 }
 
 static int mctp_fill_neigh(struct sk_buff *skb, u32 portid, u32 seq, int event,
-- 
2.32.0