[PATCH net-next 01/10] mctp: Allow MCTP on tun devices
From: Matt Johnston <matt@codeconstruct.com.au>
Date: 2021-09-29 07:26:50
Subsystem:
management component transport protocol (mctp), networking [general], the rest · Maintainers:
Jeremy Kerr, Matt Johnston, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 --git a/net/mctp/device.c b/net/mctp/device.c
index b9f38e765f61..c34963974cc1 100644
--- a/net/mctp/device.c
+++ b/net/mctp/device.c@@ -356,9 +356,12 @@ 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 5ca186d53cb0..a953f83ed02b 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c@@ -821,13 +821,18 @@ 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;
@@ -841,9 +846,7 @@ 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)
--
2.30.2