mctp: Allow per-netns default networks

Currently we have a compile-time default network (MCTP_INITIAL_DEFAULT_NET). This change introduces a default_net field on the net namespace, allowing future configuration for new interfaces.

Matt Johnston committed 5 years ago

Commit 03f2bbc1 parent 26ab3fc6 files · +23 −2Browse files

Unified · Split

6 files

include/net/mctp.h +2 −0
include/net/netns/mctp.h +3 −0
include/uapi/linux/mctp.h +0 −1
net/mctp/af_mctp.c +3 −0
net/mctp/device.c +1 −1
net/mctp/route.c +14 −0

include/net/mctp.h+2−0

@@ -37,6 +37,8 @@ struct mctp_hdr { · 36 unmodified lines
37	37
38	38	#define MCTP_HEADER_MAXLEN 4
39	39
	40	+#define MCTP_INITIAL_DEFAULT_NET 1
	41	+
40	42	static inline bool mctp_address_ok(mctp_eid_t eid)
41	43	{
42	44	return eid >= 8 && eid < 255;

include/net/netns/mctp.h+3−0

@@ -25,6 +25,9 @@ struct netns_mctp { · 24 unmodified lines
25	25	spinlock_t keys_lock;
26	26	struct hlist_head keys;
27	27
	28	+ /* MCTP network */
	29	+ unsigned int default_net;
	30	+
28	31	/* neighbour table */
29	32	struct mutex neigh_lock;
30	33	struct list_head neighbours;

include/uapi/linux/mctp.h+0−1

@@ -26,7 +26,6 @@ struct sockaddr_mctp { · 25 unmodified lines
26	26	};
27	27
28	28	#define MCTP_NET_ANY 0x0
29		−#define MCTP_NET_DEFAULT 0x0
30	29
31	30	#define MCTP_ADDR_NULL 0x00
32	31	#define MCTP_ADDR_ANY 0xff

net/mctp/af_mctp.c+3−0

@@ -94,6 +94,9 @@ static int mctp_sendmsg(struct socket sock, struct msghdr msg, size_t len) · 93 unmodified lines
94	94	if (!capable(CAP_NET_RAW))
95	95	return -EACCES;
96	96
	97	+ if (addr->smctp_network == MCTP_NET_ANY)
	98	+ addr->smctp_network = mctp_default_net(sock_net(sk));
	99	+
97	100	rt = mctp_route_lookup(sock_net(sk), addr->smctp_network,
98	101	addr->smctp_addr.s_addr);
99	102	if (!rt)

net/mctp/device.c+1−1

@@ -267,7 +267,7 @@ static struct mctp_dev mctp_add_dev(struct net_device dev) · 266 unmodified lines
267	267
268	268	spin_lock_init(&mdev->addrs_lock);
269	269
270		− mdev->net = MCTP_INITIAL_DEFAULT_NET;
	270	+ mdev->net = mctp_default_net(dev_net(dev));
271	271
272	272	/* associate to net_device */
273	273	rcu_assign_pointer(dev->mctp_ptr, mdev);

net/mctp/route.c+14−0

@@ -433,6 +433,19 @@ static struct mctp_route *mctp_route_alloc(void) · 432 unmodified lines
433	433	return rt;
434	434	}
435	435
	436	+unsigned int mctp_default_net(struct net *net)
	437	+{
	438	+ return READ_ONCE(net->mctp.default_net);
	439	+}
	440	+
	441	+int mctp_default_net_set(struct net *net, unsigned int index)
	442	+{
	443	+ if (index == 0)
	444	+ return -EINVAL;
	445	+ WRITE_ONCE(net->mctp.default_net, index);
	446	+ return 0;
	447	+}
	448	+
436	449	/* tag management */
437	450	static void mctp_reserve_tag(struct net net, struct mctp_sk_key key,
438	451	struct mctp_sock *msk)
@@ -1045,6 +1058,7 @@ static int __net_init mctp_routes_net_init(struct net *net) · 606 unmodified lines
1045	1058	mutex_init(&ns->bind_lock);
1046	1059	INIT_HLIST_HEAD(&ns->keys);
1047	1060	spin_lock_init(&ns->keys_lock);
	1061	+ WARN_ON(mctp_default_net_set(net, MCTP_INITIAL_DEFAULT_NET));
1048	1062	return 0;
1049	1063	}
1050	1064