Commit 023e2cfa authored by Johannes Berg's avatar Johannes Berg Committed by David S. Miller
Browse files

netlink/genetlink: pass network namespace to bind/unbind 



Netlink families can exist in multiple namespaces, and for the most
part multicast subscriptions are per network namespace. Thus it only
makes sense to have bind/unbind notifications per network namespace.

To achieve this, pass the network namespace of a given client socket
to the bind/unbind functions.

Also do this in generic netlink, and there also make sure that any
bind for multicast groups that only exist in init_net is rejected.
This isn't really a problem if it is accepted since a client in a
different namespace will never receive any notifications from such
a group, but it can confuse the family if not rejected (it's also
possible to silently (without telling the family) accept it, but it
would also have to be ignored on unbind so families that take any
kind of action on bind/unbind won't do unnecessary work for invalid
clients like that.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent eb69c5bf

include/linux/netlink.h

+2 −2
Original line number Diff line number Diff line
@@ -46,8 +46,8 @@ struct netlink_kernel_cfg { 
	unsigned int	flags;

	void		(*input)(struct sk_buff *skb);

	struct mutex	*cb_mutex;

	int		(*bind)(int group);

	void		(*unbind)(int group);

	int		(*bind)(struct net *net, int group);

	void		(*unbind)(struct net *net, int group);

	bool		(*compare)(struct net *net, struct sock *sk);

};

include/net/genetlink.h

+2 −2
Original line number Diff line number Diff line
@@ -56,8 +56,8 @@ struct genl_family { 
	void			(*post_doit)(const struct genl_ops *ops,

					     struct sk_buff *skb,

					     struct genl_info *info);

	int			(*mcast_bind)(int group);

	void			(*mcast_unbind)(int group);

	int			(*mcast_bind)(struct net *net, int group);

	void			(*mcast_unbind)(struct net *net, int group);

	struct nlattr **	attrbuf;	/* private */

	const struct genl_ops *	ops;		/* private */

	const struct genl_multicast_group *mcgrps; /* private */

kernel/audit.c

+1 −1
Original line number Diff line number Diff line
@@ -1100,7 +1100,7 @@ static void audit_receive(struct sk_buff *skb) 
}



/* Run custom bind function on netlink socket group connect or bind requests. */

static int audit_bind(int group)

static int audit_bind(struct net *net, int group)

{

	if (!capable(CAP_AUDIT_READ))

		return -EPERM;

net/netfilter/nfnetlink.c

+1 −1
Original line number Diff line number Diff line
@@ -463,7 +463,7 @@ static void nfnetlink_rcv(struct sk_buff *skb) 
}



#ifdef CONFIG_MODULES

static int nfnetlink_bind(int group)

static int nfnetlink_bind(struct net *net, int group)

{

	const struct nfnetlink_subsystem *ss;

	int type;

net/netlink/af_netlink.c

+11 −10
Original line number Diff line number Diff line
@@ -1141,8 +1141,8 @@ static int netlink_create(struct net *net, struct socket *sock, int protocol, 
	struct module *module = NULL;

	struct mutex *cb_mutex;

	struct netlink_sock *nlk;

	int (*bind)(int group);

	void (*unbind)(int group);

	int (*bind)(struct net *net, int group);

	void (*unbind)(struct net *net, int group);

	int err = 0;



	sock->state = SS_UNCONNECTED;
@@ -1251,7 +1251,7 @@ static int netlink_release(struct socket *sock) 


		for (i = 0; i < nlk->ngroups; i++)

			if (test_bit(i, nlk->groups))

				nlk->netlink_unbind(i + 1);

				nlk->netlink_unbind(sock_net(sk), i + 1);

	}

	kfree(nlk->groups);

	nlk->groups = NULL;
@@ -1418,8 +1418,9 @@ static int netlink_realloc_groups(struct sock *sk) 
}



static void netlink_undo_bind(int group, long unsigned int groups,

			      struct netlink_sock *nlk)

			      struct sock *sk)

{

	struct netlink_sock *nlk = nlk_sk(sk);

	int undo;



	if (!nlk->netlink_unbind)
@@ -1427,7 +1428,7 @@ static void netlink_undo_bind(int group, long unsigned int groups, 


	for (undo = 0; undo < group; undo++)

		if (test_bit(undo, &groups))

			nlk->netlink_unbind(undo);

			nlk->netlink_unbind(sock_net(sk), undo);

}



static int netlink_bind(struct socket *sock, struct sockaddr *addr,
@@ -1465,10 +1466,10 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, 
		for (group = 0; group < nlk->ngroups; group++) {

			if (!test_bit(group, &groups))

				continue;

			err = nlk->netlink_bind(group);

			err = nlk->netlink_bind(net, group);

			if (!err)

				continue;

			netlink_undo_bind(group, groups, nlk);

			netlink_undo_bind(group, groups, sk);

			return err;

		}

	}
@@ -1478,7 +1479,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, 
			netlink_insert(sk, net, nladdr->nl_pid) :

			netlink_autobind(sock);

		if (err) {

			netlink_undo_bind(nlk->ngroups, groups, nlk);

			netlink_undo_bind(nlk->ngroups, groups, sk);

			return err;

		}

	}
@@ -2129,7 +2130,7 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname, 
		if (!val || val - 1 >= nlk->ngroups)

			return -EINVAL;

		if (optname == NETLINK_ADD_MEMBERSHIP && nlk->netlink_bind) {

			err = nlk->netlink_bind(val);

			err = nlk->netlink_bind(sock_net(sk), val);

			if (err)

				return err;

		}
@@ -2138,7 +2139,7 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname, 
					 optname == NETLINK_ADD_MEMBERSHIP);

		netlink_table_ungrab();

		if (optname == NETLINK_DROP_MEMBERSHIP && nlk->netlink_unbind)

			nlk->netlink_unbind(val);

			nlk->netlink_unbind(sock_net(sk), val);



		err = 0;

		break;

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