Commit 2b432a04 authored by Willem de Bruijn's avatar Willem de Bruijn Committed by Ben Hutchings

ax25: add link layer header validation function

commit ea47781c upstream.

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>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent a534cb3d
...@@ -231,9 +231,24 @@ int ax25_rebuild_header(struct sk_buff *skb) ...@@ -231,9 +231,24 @@ int ax25_rebuild_header(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,
.rebuild = ax25_rebuild_header, .rebuild = ax25_rebuild_header,
.validate = ax25_validate_header,
}; };
EXPORT_SYMBOL(ax25_hard_header); EXPORT_SYMBOL(ax25_hard_header);
......
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