batman-adv: add backbone table netlink support (ea4152e1) · Commits · e / devices / android_kernel_fairphone_FP3

include/uapi/linux/batman_adv.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -157,6 +157,7 @@ enum batadv_nl_attrs {
		* @BATADV_CMD_GET_NEIGHBORS: Query list of neighbours
		* @BATADV_CMD_GET_GATEWAYS: Query list of gateways
		* @BATADV_CMD_GET_BLA_CLAIM: Query list of bridge loop avoidance claims
		* @BATADV_CMD_GET_BLA_BACKBONE: Query list of bridge loop avoidance backbones
		* @__BATADV_CMD_AFTER_LAST: internal use
		* @BATADV_CMD_MAX: highest used command number
		*/
		@@ -173,6 +174,7 @@ enum batadv_nl_commands {
		BATADV_CMD_GET_NEIGHBORS,
		BATADV_CMD_GET_GATEWAYS,
		BATADV_CMD_GET_BLA_CLAIM,
		BATADV_CMD_GET_BLA_BACKBONE,
		/* add new commands above here */
		__BATADV_CMD_AFTER_LAST,
		BATADV_CMD_MAX = __BATADV_CMD_AFTER_LAST - 1

net/batman-adv/bridge_loop_avoidance.c

+164 −0

Original line number	Diff line number	Diff line
		@@ -2283,3 +2283,167 @@ int batadv_bla_backbone_table_seq_print_text(struct seq_file seq, void offset)
		batadv_hardif_put(primary_if);
		return 0;
		}

		/**
		* batadv_bla_backbone_dump_entry - dump one entry of the backbone table
		* to a netlink socket
		* @msg: buffer for the message
		* @portid: netlink port
		* @seq: Sequence number of netlink message
		* @primary_if: primary interface
		* @backbone_gw: entry to dump
		*
		* Return: 0 or error code.
		*/
		static int
		batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
		struct batadv_hard_iface *primary_if,
		struct batadv_bla_backbone_gw *backbone_gw)
		{
		u8 *primary_addr = primary_if->net_dev->dev_addr;
		u16 backbone_crc;
		bool is_own;
		int msecs;
		void *hdr;
		int ret = -EINVAL;

		hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
		NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE);
		if (!hdr) {
		ret = -ENOBUFS;
		goto out;
		}

		is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);

		spin_lock_bh(&backbone_gw->crc_lock);
		backbone_crc = backbone_gw->crc;
		spin_unlock_bh(&backbone_gw->crc_lock);

		msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime);

		if (is_own)
		if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
		genlmsg_cancel(msg, hdr);
		goto out;
		}

		if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
		backbone_gw->orig) \|\|
		nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) \|\|
		nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
		backbone_crc) \|\|
		nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
		genlmsg_cancel(msg, hdr);
		goto out;
		}

		genlmsg_end(msg, hdr);
		ret = 0;

		out:
		return ret;
		}

		/**
		* batadv_bla_backbone_dump_bucket - dump one bucket of the backbone table
		* to a netlink socket
		* @msg: buffer for the message
		* @portid: netlink port
		* @seq: Sequence number of netlink message
		* @primary_if: primary interface
		* @head: bucket to dump
		* @idx_skip: How many entries to skip
		*
		* Return: always 0.
		*/
		static int
		batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
		struct batadv_hard_iface *primary_if,
		struct hlist_head head, int idx_skip)
		{
		struct batadv_bla_backbone_gw *backbone_gw;
		int idx = 0;

		rcu_read_lock();
		hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
		if (idx++ < *idx_skip)
		continue;
		if (batadv_bla_backbone_dump_entry(msg, portid, seq,
		primary_if, backbone_gw)) {
		*idx_skip = idx - 1;
		goto unlock;
		}
		}

		*idx_skip = idx;
		unlock:
		rcu_read_unlock();
		return 0;
		}

		/**
		* batadv_bla_backbone_dump - dump backbone table to a netlink socket
		* @msg: buffer for the message
		* @cb: callback structure containing arguments
		*
		* Return: message length.
		*/
		int batadv_bla_backbone_dump(struct sk_buff msg, struct netlink_callback cb)
		{
		struct batadv_hard_iface *primary_if = NULL;
		int portid = NETLINK_CB(cb->skb).portid;
		struct net *net = sock_net(cb->skb->sk);
		struct net_device *soft_iface;
		struct batadv_hashtable *hash;
		struct batadv_priv *bat_priv;
		int bucket = cb->args[0];
		struct hlist_head *head;
		int idx = cb->args[1];
		int ifindex;
		int ret = 0;

		ifindex = batadv_netlink_get_ifindex(cb->nlh,
		BATADV_ATTR_MESH_IFINDEX);
		if (!ifindex)
		return -EINVAL;

		soft_iface = dev_get_by_index(net, ifindex);
		if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
		ret = -ENODEV;
		goto out;
		}

		bat_priv = netdev_priv(soft_iface);
		hash = bat_priv->bla.backbone_hash;

		primary_if = batadv_primary_if_get_selected(bat_priv);
		if (!primary_if \|\| primary_if->if_status != BATADV_IF_ACTIVE) {
		ret = -ENOENT;
		goto out;
		}

		while (bucket < hash->size) {
		head = &hash->table[bucket];

		if (batadv_bla_backbone_dump_bucket(msg, portid,
		cb->nlh->nlmsg_seq,
		primary_if, head, &idx))
		break;
		bucket++;
		}

		cb->args[0] = bucket;
		cb->args[1] = idx;

		ret = msg->len;

		out:
		if (primary_if)
		batadv_hardif_put(primary_if);

		if (soft_iface)
		dev_put(soft_iface);

		return ret;
		}

net/batman-adv/bridge_loop_avoidance.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -39,6 +39,7 @@ int batadv_bla_claim_table_seq_print_text(struct seq_file seq, void offset);
		int batadv_bla_claim_dump(struct sk_buff msg, struct netlink_callback cb);
		int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq,
		void *offset);
		int batadv_bla_backbone_dump(struct sk_buff msg, struct netlink_callback cb);
		bool batadv_bla_is_backbone_gw_orig(struct batadv_priv bat_priv, u8 orig,
		unsigned short vid);
		bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
		@@ -120,6 +121,12 @@ static inline int batadv_bla_claim_dump(struct sk_buff *msg,
		return -EOPNOTSUPP;
		}

		static inline int batadv_bla_backbone_dump(struct sk_buff *msg,
		struct netlink_callback *cb)
		{
		return -EOPNOTSUPP;
		}

		#endif /* ifdef CONFIG_BATMAN_ADV_BLA */

		#endif /* ifndef _NET_BATMAN_ADV_BLA_H_ */

net/batman-adv/netlink.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -600,6 +600,13 @@ static struct genl_ops batadv_netlink_ops[] = {
		.policy = batadv_netlink_policy,
		.dumpit = batadv_bla_claim_dump,
		},
		{
		.cmd = BATADV_CMD_GET_BLA_BACKBONE,
		.flags = GENL_ADMIN_PERM,
		.policy = batadv_netlink_policy,
		.dumpit = batadv_bla_backbone_dump,
		},

		};

		/**