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| author | Jeremy Kerr <jk@codeconstruct.com.au> | 2021-09-29 15:26:06 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-09-29 11:00:11 +0100 |
| commit | 1f6c77ac9e6ecef152fd5df94c4b3c346adb197a (patch) | |
| tree | 33799c101a27e1b8a0a15253e949db7abb2ad547 /net/mctp | |
| parent | f364dd71d92fe6722fe5d47803be974dc0c40762 (diff) | |
| download | linux-1f6c77ac9e6ecef152fd5df94c4b3c346adb197a.tar.gz linux-1f6c77ac9e6ecef152fd5df94c4b3c346adb197a.tar.bz2 linux-1f6c77ac9e6ecef152fd5df94c4b3c346adb197a.zip | |
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')
| -rw-r--r-- | net/mctp/route.c | 23 |
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; |