Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[karo-tx-linux.git] / net / netfilter / nf_tables_api.c

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index bd9715e5ff266202ab4c93f6475410d64e0ec9c5..b70d3ea1430e7db49c4a4fc86f87dbb47cfdbe8c 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4409,6 +4409,31 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
        return 0;
 }
 
+/**
+ *     nft_parse_u32_check - fetch u32 attribute and check for maximum value
+ *
+ *     @attr: netlink attribute to fetch value from
+ *     @max: maximum value to be stored in dest
+ *     @dest: pointer to the variable
+ *
+ *     Parse, check and store a given u32 netlink attribute into variable.
+ *     This function returns -ERANGE if the value goes over maximum value.
+ *     Otherwise a 0 is returned and the attribute value is stored in the
+ *     destination variable.
+ */
+unsigned int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
+{
+       int val;
+
+       val = ntohl(nla_get_be32(attr));
+       if (val > max)
+               return -ERANGE;
+
+       *dest = val;
+       return 0;
+}
+EXPORT_SYMBOL_GPL(nft_parse_u32_check);
+
 /**
  *     nft_parse_register - parse a register value from a netlink attribute
  *