This patch introduces a new NLA_BINARY attribute policy type with the
verification of simply checking the maximum length of the payload.
It also fixes a small typo in the example.
Signed-off-by: Johannes Berg [EMAIL PROTECTED]
Cc: Thomas Graf [EMAIL PROTECTED]
Cc: netdev@vger.kernel.org
---
include/net/netlink.h |4 +++-
net/netlink/attr.c|5 +
2 files changed, 8 insertions(+), 1 deletion(-)
--- linux-2.6.orig/include/net/netlink.h2007-03-23 15:45:52.932598534
+0100
+++ linux-2.6/include/net/netlink.h 2007-03-23 15:46:25.962598534 +0100
@@ -171,6 +171,7 @@ enum {
NLA_MSECS,
NLA_NESTED,
NLA_NUL_STRING,
+ NLA_BINARY,
__NLA_TYPE_MAX,
};
@@ -188,12 +189,13 @@ enum {
*NLA_STRING Maximum length of string
*NLA_NUL_STRING Maximum length of string (excluding NUL)
*NLA_FLAG Unused
+ *NLA_BINARY Maximum length of attribute payload
*All otherExact length of attribute payload
*
* Example:
* static struct nla_policy my_policy[ATTR_MAX+1] __read_mostly = {
* [ATTR_FOO] = { .type = NLA_U16 },
- * [ATTR_BAR] = { .type = NLA_STRING, len = BARSIZ },
+ * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
* [ATTR_BAZ] = { .len = sizeof(struct mystruct) },
* };
*/
--- linux-2.6.orig/net/netlink/attr.c 2007-03-23 15:46:53.112598534 +0100
+++ linux-2.6/net/netlink/attr.c2007-03-23 15:48:12.902598534 +0100
@@ -67,6 +67,11 @@ static int validate_nla(struct nlattr *n
}
break;
+ case NLA_BINARY:
+ if (pt-len attrlen pt-len)
+ return -ERANGE;
+ break;
+
default:
if (pt-len)
minlen = pt-len;
-
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