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mctp: Allow local delivery to the null EID

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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>
This commit is contained in:
Jeremy Kerr 2021-09-29 15:26:06 +08:00 • committed by David S. Miller
parent f364dd71d9
commit 1f6c77ac9e
1 changed files with 23 additions and 0 deletions
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23
net/mctp/route.c
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@ -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;