ax25: add link layer header validation function

As variable length protocol, AX25 fails link layer header validation
tests based on a minimum length. header_ops.validate allows protocols
to validate headers that are shorter than hard_header_len. Implement
this callback for AX25.

See also http://comments.gmane.org/gmane.linux.network/401064

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/ax25/ax25_ip.c b/net/ax25/ax25_ip.c
index b563a3f5f2a8..2fa3be965101 100644
--- a/net/ax25/ax25_ip.c
+++ b/net/ax25/ax25_ip.c
@@ -228,8 +228,23 @@ netdev_tx_t ax25_ip_xmit(struct sk_buff *skb)
 }
 #endif
 
+static bool ax25_validate_header(const char *header, unsigned int len)
+{
+        ax25_digi digi;
+
+        if (!len)
+                return false;
+
+        if (header[0])
+                return true;
+
+        return ax25_addr_parse(header + 1, len - 1, NULL, NULL, &digi, NULL,
+                               NULL);
+}
+
 const struct header_ops ax25_header_ops = {
         .create = ax25_hard_header,
+        .validate = ax25_validate_header,
 };
 
 EXPORT_SYMBOL(ax25_header_ops);