Commit ea47781c authored by Willem de Bruijn's avatar Willem de Bruijn Committed by David S. Miller

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/401064Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2793a23a
...@@ -228,8 +228,23 @@ netdev_tx_t ax25_ip_xmit(struct sk_buff *skb) ...@@ -228,8 +228,23 @@ netdev_tx_t ax25_ip_xmit(struct sk_buff *skb)
} }
#endif #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 = { const struct header_ops ax25_header_ops = {
.create = ax25_hard_header, .create = ax25_hard_header,
.validate = ax25_validate_header,
}; };
EXPORT_SYMBOL(ax25_header_ops); EXPORT_SYMBOL(ax25_header_ops);
......
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