batman-adv: add multicast flags netlink support
Dump the list of multicast flags entries via the netlink socket.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index c7a1305..5615b6a 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -40,6 +40,7 @@
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
+#include <linux/netlink.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
@@ -52,14 +53,20 @@
#include <linux/types.h>
#include <linux/workqueue.h>
#include <net/addrconf.h>
+#include <net/genetlink.h>
#include <net/if_inet6.h>
#include <net/ip.h>
#include <net/ipv6.h>
+#include <net/netlink.h>
+#include <net/sock.h>
#include <uapi/linux/batadv_packet.h>
+#include <uapi/linux/batman_adv.h>
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
+#include "netlink.h"
+#include "soft-interface.h"
#include "translation-table.h"
#include "tvlv.h"
@@ -1334,6 +1341,236 @@ int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset)
#endif
/**
+ * batadv_mcast_mesh_info_put() - put multicast info into a netlink message
+ * @msg: buffer for the message
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Return: 0 or error code.
+ */
+int batadv_mcast_mesh_info_put(struct sk_buff *msg,
+ struct batadv_priv *bat_priv)
+{
+ u32 flags = bat_priv->mcast.flags;
+ u32 flags_priv = BATADV_NO_FLAGS;
+
+ if (bat_priv->mcast.bridged) {
+ flags_priv |= BATADV_MCAST_FLAGS_BRIDGED;
+
+ if (bat_priv->mcast.querier_ipv4.exists)
+ flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS;
+ if (bat_priv->mcast.querier_ipv6.exists)
+ flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS;
+ if (bat_priv->mcast.querier_ipv4.shadowing)
+ flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING;
+ if (bat_priv->mcast.querier_ipv6.shadowing)
+ flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING;
+ }
+
+ if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) ||
+ nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+/**
+ * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table
+ * to a netlink socket
+ * @msg: buffer for the message
+ * @portid: netlink port
+ * @seq: Sequence number of netlink message
+ * @orig_node: originator to dump the multicast flags of
+ *
+ * Return: 0 or error code.
+ */
+static int
+batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
+ struct batadv_orig_node *orig_node)
+{
+ void *hdr;
+
+ hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
+ NLM_F_MULTI, BATADV_CMD_GET_MCAST_FLAGS);
+ if (!hdr)
+ return -ENOBUFS;
+
+ if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
+ orig_node->orig)) {
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+ }
+
+ if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
+ &orig_node->capabilities)) {
+ if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS,
+ orig_node->mcast_flags)) {
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+ }
+ }
+
+ genlmsg_end(msg, hdr);
+ return 0;
+}
+
+/**
+ * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags
+ * table to a netlink socket
+ * @msg: buffer for the message
+ * @portid: netlink port
+ * @seq: Sequence number of netlink message
+ * @head: bucket to dump
+ * @idx_skip: How many entries to skip
+ *
+ * Return: 0 or error code.
+ */
+static int
+batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
+ struct hlist_head *head, long *idx_skip)
+{
+ struct batadv_orig_node *orig_node;
+ long idx = 0;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
+ if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
+ &orig_node->capa_initialized))
+ continue;
+
+ if (idx < *idx_skip)
+ goto skip;
+
+ if (batadv_mcast_flags_dump_entry(msg, portid, seq,
+ orig_node)) {
+ rcu_read_unlock();
+ *idx_skip = idx;
+
+ return -EMSGSIZE;
+ }
+
+skip:
+ idx++;
+ }
+ rcu_read_unlock();
+
+ return 0;
+}
+
+/**
+ * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
+ * @msg: buffer for the message
+ * @portid: netlink port
+ * @seq: Sequence number of netlink message
+ * @bat_priv: the bat priv with all the soft interface information
+ * @bucket: current bucket to dump
+ * @idx: index in current bucket to the next entry to dump
+ *
+ * Return: 0 or error code.
+ */
+static int
+__batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, u32 seq,
+ struct batadv_priv *bat_priv, long *bucket, long *idx)
+{
+ struct batadv_hashtable *hash = bat_priv->orig_hash;
+ long bucket_tmp = *bucket;
+ struct hlist_head *head;
+ long idx_tmp = *idx;
+
+ while (bucket_tmp < hash->size) {
+ head = &hash->table[bucket_tmp];
+
+ if (batadv_mcast_flags_dump_bucket(msg, portid, seq, head,
+ &idx_tmp))
+ break;
+
+ bucket_tmp++;
+ idx_tmp = 0;
+ }
+
+ *bucket = bucket_tmp;
+ *idx = idx_tmp;
+
+ return msg->len;
+}
+
+/**
+ * batadv_mcast_netlink_get_primary() - get primary interface from netlink
+ * callback
+ * @cb: netlink callback structure
+ * @primary_if: the primary interface pointer to return the result in
+ *
+ * Return: 0 or error code.
+ */
+static int
+batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
+ struct batadv_hard_iface **primary_if)
+{
+ struct batadv_hard_iface *hard_iface = NULL;
+ struct net *net = sock_net(cb->skb->sk);
+ struct net_device *soft_iface;
+ struct batadv_priv *bat_priv;
+ 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);
+
+ hard_iface = batadv_primary_if_get_selected(bat_priv);
+ if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+out:
+ if (soft_iface)
+ dev_put(soft_iface);
+
+ if (!ret && primary_if)
+ *primary_if = hard_iface;
+ else
+ batadv_hardif_put(hard_iface);
+
+ return ret;
+}
+
+/**
+ * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
+ * @msg: buffer for the message
+ * @cb: callback structure containing arguments
+ *
+ * Return: message length.
+ */
+int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb)
+{
+ struct batadv_hard_iface *primary_if = NULL;
+ int portid = NETLINK_CB(cb->skb).portid;
+ struct batadv_priv *bat_priv;
+ long *bucket = &cb->args[0];
+ long *idx = &cb->args[1];
+ int ret;
+
+ ret = batadv_mcast_netlink_get_primary(cb, &primary_if);
+ if (ret)
+ return ret;
+
+ bat_priv = netdev_priv(primary_if->soft_iface);
+ ret = __batadv_mcast_flags_dump(msg, portid, cb->nlh->nlmsg_seq,
+ bat_priv, bucket, idx);
+
+ batadv_hardif_put(primary_if);
+ return ret;
+}
+
+/**
* batadv_mcast_free() - free the multicast optimizations structures
* @bat_priv: the bat priv with all the soft interface information
*/