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authorJeremy Kerr <jk@codeconstruct.com.au>2021-09-29 15:26:06 +0800
committerDavid S. Miller <davem@davemloft.net>2021-09-29 11:00:11 +0100
commit1f6c77ac9e6ecef152fd5df94c4b3c346adb197a (patch)
tree33799c101a27e1b8a0a15253e949db7abb2ad547 /net/mctp/route.c
parentf364dd71d92fe6722fe5d47803be974dc0c40762 (diff)
mctp: Allow local delivery to the null EID
We may need to receive packets addressed to the null EID (==0), but addressed to us at the physical layer. This change adds a lookup for local routes when we see a packet addressed to EID 0, and a local phys address. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mctp/route.c')
-rw-r--r--net/mctp/route.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/net/mctp/route.c b/net/mctp/route.c
index a953f83ed02b..224fd25b3678 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -474,6 +474,10 @@ static int mctp_alloc_local_tag(struct mctp_sock *msk,
int rc = -EAGAIN;
u8 tagbits;
+ /* for NULL destination EIDs, we may get a response from any peer */
+ if (daddr == MCTP_ADDR_NULL)
+ daddr = MCTP_ADDR_ANY;
+
/* be optimistic, alloc now */
key = mctp_key_alloc(msk, saddr, daddr, 0, GFP_KERNEL);
if (!key)
@@ -552,6 +556,20 @@ struct mctp_route *mctp_route_lookup(struct net *net, unsigned int dnet,
return rt;
}
+static struct mctp_route *mctp_route_lookup_null(struct net *net,
+ struct net_device *dev)
+{
+ struct mctp_route *rt;
+
+ list_for_each_entry_rcu(rt, &net->mctp.routes, list) {
+ if (rt->dev->dev == dev && rt->type == RTN_LOCAL &&
+ refcount_inc_not_zero(&rt->refs))
+ return rt;
+ }
+
+ return NULL;
+}
+
/* sends a skb to rt and releases the route. */
int mctp_do_route(struct mctp_route *rt, struct sk_buff *skb)
{
@@ -849,6 +867,11 @@ static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
cb->net = READ_ONCE(mdev->net);
rt = mctp_route_lookup(net, cb->net, mh->dest);
+
+ /* NULL EID, but addressed to our physical address */
+ if (!rt && mh->dest == MCTP_ADDR_NULL && skb->pkt_type == PACKET_HOST)
+ rt = mctp_route_lookup_null(net, dev);
+
if (!rt)
goto err_drop;