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Commit 68815d5b authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

Revert "genetlink: remove genl_bind" 



This reverts commit 7b42410d which is
commit 1e82a62fec613844da9e558f3493540a5b7a7b67 upstream.

It breaks the API and isn't something we should really have to worry
about in android devices.

Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
Change-Id: I4ec83063705a9f0fe449ff46803f6594b69efd08
parent 51462c24

include/net/genetlink.h

+8 −0
Original line number Diff line number Diff line
@@ -35,6 +35,12 @@ struct genl_info; 
 *	do additional, common, filtering and return an error

 * @post_doit: called after an operation's doit callback, it may

 *	undo operations done by pre_doit, for example release locks

 * @mcast_bind: a socket bound to the given multicast group (which

 *	is given as the offset into the groups array)

 * @mcast_unbind: a socket was unbound from the given multicast group.

 *	Note that unbind() will not be called symmetrically if the

 *	generic netlink family is removed while there are still open

 *	sockets.

 * @attrbuf: buffer to store parsed attributes (private)

 * @mcgrps: multicast groups used by this family

 * @n_mcgrps: number of multicast groups
@@ -58,6 +64,8 @@ struct genl_family { 
	void			(*post_doit)(const struct genl_ops *ops,

					     struct sk_buff *skb,

					     struct genl_info *info);

	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;

	const struct genl_multicast_group *mcgrps;

net/netlink/genetlink.c

+49 −0
Original line number Diff line number Diff line
@@ -989,11 +989,60 @@ static struct genl_family genl_ctrl __ro_after_init = { 
	.netnsok = true,

};



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

{

	struct genl_family *f;

	int err = -ENOENT;

	unsigned int id;



	down_read(&cb_lock);



	idr_for_each_entry(&genl_fam_idr, f, id) {

		if (group >= f->mcgrp_offset &&

		    group < f->mcgrp_offset + f->n_mcgrps) {

			int fam_grp = group - f->mcgrp_offset;



			if (!f->netnsok && net != &init_net)

				err = -ENOENT;

			else if (f->mcast_bind)

				err = f->mcast_bind(net, fam_grp);

			else

				err = 0;

			break;

		}

	}

	up_read(&cb_lock);



	return err;

}



static void genl_unbind(struct net *net, int group)

{

	struct genl_family *f;

	unsigned int id;



	down_read(&cb_lock);



	idr_for_each_entry(&genl_fam_idr, f, id) {

		if (group >= f->mcgrp_offset &&

		    group < f->mcgrp_offset + f->n_mcgrps) {

			int fam_grp = group - f->mcgrp_offset;



			if (f->mcast_unbind)

				f->mcast_unbind(net, fam_grp);

			break;

		}

	}

	up_read(&cb_lock);

}



static int __net_init genl_pernet_init(struct net *net)

{

	struct netlink_kernel_cfg cfg = {

		.input		= genl_rcv,

		.flags		= NL_CFG_F_NONROOT_RECV,

		.bind		= genl_bind,

		.unbind		= genl_unbind,

	};



	/* we'll bump the group number right afterwards */