Add support for filtering neighbor dumps by device by adding the
NDA_IFINDEX attribute to the dump request. When set the kernel only
sends neighbor entries for the given device.
Signed-off-by: David Ahern <d...@cumulusnetworks.com>
---
net/core/neighbour.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 8c57fdf4d68e..f7786eaef613 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2249,6 +2249,14 @@ static bool neigh_master_filtered(struct net_device
*dev, int master_idx)
return false;
}
+static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx)
+{
+ if (filter_idx && dev->ifindex != filter_idx)
+ return true;
+
+ return false;
+}
+
static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
struct netlink_callback *cb)
{
@@ -2259,16 +2267,19 @@ static int neigh_dump_table(struct neigh_table *tbl,
struct sk_buff *skb,
int rc, h, s_h = cb->args[1];
int idx, s_idx = idx = cb->args[2];
struct neigh_hash_table *nht;
- int filter_master_idx = 0;
+ int filter_master_idx = 0, filter_idx = 0;
unsigned int flags = NLM_F_MULTI;
int err;
err = nlmsg_parse(nlh, sizeof(struct ndmsg), tb, NDA_MAX, NULL);
if (!err) {
+ if (tb[NDA_IFINDEX])
+ filter_idx = nla_get_u32(tb[NDA_IFINDEX]);
+
if (tb[NDA_MASTER])
filter_master_idx = nla_get_u32(tb[NDA_MASTER]);
- if (filter_master_idx)
+ if (filter_idx | filter_master_idx)
flags |= NLM_F_DUMP_FILTERED;
}
@@ -2283,6 +2294,8 @@ static int neigh_dump_table(struct neigh_table *tbl,
struct sk_buff *skb,
n = rcu_dereference_bh(n->next)) {
if (!net_eq(dev_net(n->dev), net))
continue;
+ if (neigh_ifindex_filtered(n->dev, filter_idx))
+ continue;
if (neigh_master_filtered(n->dev, filter_master_idx))
continue;
if (idx < s_idx)
--
1.9.1
--
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