Staging: batman-adv: fix batman icmp originating from secondary interface

If a batman icmp packet had to be routed over a secondary interface
at the first hop, the mac address of that secondary interface would
be written in the 'orig' field of the icmp packet. A node which is
more than one hop away is not aware of the mac address because
secondary interfaces are not flooded through the whole mesh and
therefore can't send a reply.
This patch always sends the mac address of the primary interface
in the 'orig' field of the icmp packet.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 9 insertions, 4 deletions

diff --git a/drivers/staging/batman-adv/icmp_socket.c b/drivers/staging/batman-adv/icmp_socket.c
index fc3d32c12729..3ae7dd2d2d4d 100644
--- a/drivers/staging/batman-adv/icmp_socket.c
+++ b/drivers/staging/batman-adv/icmp_socket.c
@@ -67,6 +67,7 @@ static int bat_socket_open(struct inode *inode, struct file *file)
         INIT_LIST_HEAD(&socket_client->queue_list);
         socket_client->queue_len = 0;
         socket_client->index = i;
+        socket_client->bat_priv = inode->i_private;
         spin_lock_init(&socket_client->lock);
         init_waitqueue_head(&socket_client->queue_wait);
 
@@ -151,9 +152,8 @@ static ssize_t bat_socket_read(struct file *file, char __user *buf,
 static ssize_t bat_socket_write(struct file *file, const char __user *buff,
                                 size_t len, loff_t *off)
 {
-        /* FIXME: each orig_node->batman_if will be attached to a softif */
-        struct bat_priv *bat_priv = netdev_priv(soft_device);
         struct socket_client *socket_client = file->private_data;
+        struct bat_priv *bat_priv = socket_client->bat_priv;
         struct icmp_packet_rr icmp_packet;
         struct orig_node *orig_node;
         struct batman_if *batman_if;
@@ -168,6 +168,9 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
                 return -EINVAL;
         }
 
+        if (!bat_priv->primary_if)
+                return -EFAULT;
+
         if (len >= sizeof(struct icmp_packet_rr))
                 packet_len = sizeof(struct icmp_packet_rr);
 
@@ -223,7 +226,8 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
         if (batman_if->if_status != IF_ACTIVE)
                 goto dst_unreach;
 
-        memcpy(icmp_packet.orig, batman_if->net_dev->dev_addr, ETH_ALEN);
+        memcpy(icmp_packet.orig,
+               bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 
         if (packet_len == sizeof(struct icmp_packet_rr))
                 memcpy(icmp_packet.rr, batman_if->net_dev->dev_addr, ETH_ALEN);
@@ -271,7 +275,7 @@ int bat_socket_setup(struct bat_priv *bat_priv)
                 goto err;
 
         d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
-                                bat_priv->debug_dir, NULL, &fops);
+                                bat_priv->debug_dir, bat_priv, &fops);
         if (d)
                 goto err;
 
diff --git a/drivers/staging/batman-adv/types.h b/drivers/staging/batman-adv/types.h
index 21d0717afb09..9aa9d369c752 100644
--- a/drivers/staging/batman-adv/types.h
+++ b/drivers/staging/batman-adv/types.h
@@ -126,6 +126,7 @@ struct socket_client {
         unsigned char index;
         spinlock_t lock;
         wait_queue_head_t queue_wait;
+        struct bat_priv *bat_priv;
 };
 
 struct socket_packet {