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[RFC,net-next,15/16] mctp: Allow MCTP on tun devices

Message ID 20210603065218.570867-16-jk@codeconstruct.com.au (mailing list archive)
State RFC
Delegated to: Netdev Maintainers
Headers show
Series Add Management Controller Transport Protocol support | expand

Checks

Context Check Description
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count fail Series longer than 15 patches
netdev/tree_selection success Clearly marked for net-next
netdev/subject_prefix success Link
netdev/cc_maintainers warning 2 maintainers not CCed: davem@davemloft.net kuba@kernel.org
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit fail Errors and warnings before: 4 this patch: 4
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 44 lines checked
netdev/build_allmodconfig_warn fail Errors and warnings before: 4 this patch: 4
netdev/header_inline success Link

Commit Message

Jeremy Kerr June 3, 2021, 6:52 a.m. UTC 
From: Matt Johnston <matt@codeconstruct.com.au>

Allowing TUN is useful for testing, to route packets to userspace or to
tunnel between machines.

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
---
 net/mctp/device.c |  7 +++++--
 net/mctp/route.c  | 13 ++++++++-----
 2 files changed, 13 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/net/mctp/device.c b/net/mctp/device.c
index 4c9932de56d9..031950f39c06 100644
--- a/net/mctp/device.c
+++ b/net/mctp/device.c
@@ -302,9 +302,12 @@  static int mctp_register(struct net_device *dev)
 	if (rtnl_dereference(dev->mctp_ptr))
 		return 0;
 
-	/* only register specific types; MCTP-specific and loopback for now */
-	if (dev->type != ARPHRD_MCTP && dev->type != ARPHRD_LOOPBACK)
+	/* only register specific types (inc. NONE for TUN devices) */
+	if (!(dev->type == ARPHRD_MCTP ||
+	      dev->type == ARPHRD_LOOPBACK ||
+	      dev->type == ARPHRD_NONE)) {
 		return 0;
+	}
 
 	mdev = mctp_add_dev(dev);
 	if (IS_ERR(mdev))
diff --git a/net/mctp/route.c b/net/mctp/route.c
index e29b1dd0f176..61d4715eba93 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -792,13 +792,18 @@  static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
 				struct net_device *orig_dev)
 {
 	struct net *net = dev_net(dev);
+	struct mctp_dev *mdev;
 	struct mctp_skb_cb *cb;
 	struct mctp_route *rt;
 	struct mctp_hdr *mh;
 
-	/* basic non-data sanity checks */
-	if (dev->type != ARPHRD_MCTP)
+	rcu_read_lock();
+	mdev = __mctp_dev_get(dev);
+	rcu_read_unlock();
+	if (!mdev) {
+		/* basic non-data sanity checks */
 		goto err_drop;
+	}
 
 	if (!pskb_may_pull(skb, sizeof(struct mctp_hdr)))
 		goto err_drop;
@@ -812,9 +817,7 @@  static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
 		goto err_drop;
 
 	cb = __mctp_cb(skb);
-	rcu_read_lock();
-	cb->net = READ_ONCE(__mctp_dev_get(dev)->net);
-	rcu_read_unlock();
+	cb->net = READ_ONCE(mdev->net);
 
 	rt = mctp_route_lookup(net, cb->net, mh->dest);
 	if (!rt)