P2P: Allow access to group members

Some new code will require access to P2P group members, so add API to
retrieve the number of members and iterate the members themselves.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

src/p2p/p2p.h

@@ -1324,4 +1324,20 @@ void p2p_set_best_channels(struct p2p_data *p2p, int freq_24, int freq_5,
 
 const u8 * p2p_get_go_neg_peer(struct p2p_data *p2p);
 
+/**
+ * p2p_get_group_num_members - Get number of members in group
+ * @group: P2P group context from p2p_group_init()
+ * Returns: Number of members in the group
+ */
+unsigned int p2p_get_group_num_members(struct p2p_group *group);
+
+/**
+ * p2p_iterate_group_members - Iterate group members
+ * @group: P2P group context from p2p_group_init()
+ * @next: iteration pointer, must be a pointer to a void * that is set to %NULL
+ *	on the first call and not modified later
+ * Returns: A P2P Interface Address for each call and %NULL for no more members
+ */
+const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next);
+
 #endif /* P2P_H */

src/p2p/p2p_group.c

@@ -647,3 +647,27 @@ u8 p2p_group_presence_req(struct p2p_group *group,
 
 	return P2P_SC_SUCCESS;
 }
+
+
+unsigned int p2p_get_group_num_members(struct p2p_group *group)
+{
+	return group->num_members;
+}
+
+
+const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next)
+{
+	struct p2p_group_member *iter = *next;
+
+	if (!iter)
+		iter = group->members;
+	else
+		iter = iter->next;
+
+	*next = iter;
+
+	if (!iter)
+		return NULL;
+
+	return iter->addr;
+}