Commit ea47781c authored Mar 09, 2016 by Willem de Bruijn Committed by David S. Miller Mar 09, 2016

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>

parent 2793a23a

net/ax25/ax25_ip.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -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);