netlink: remove NLA_NESTED_COMPAT

This isn't used anywhere, so we might as well get rid of it.
Reviewed-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/netlink.h

@@ -172,7 +172,6 @@ enum {
 	NLA_FLAG,
 	NLA_MSECS,
 	NLA_NESTED,
-	NLA_NESTED_COMPAT,
 	NLA_NUL_STRING,
 	NLA_BINARY,
 	NLA_S8,
@@ -203,7 +202,6 @@ enum {
  *    NLA_BINARY           Maximum length of attribute payload
  *    NLA_NESTED           Don't use `len' field -- length verification is
  *                         done by checking len of nested header (or empty)
- *    NLA_NESTED_COMPAT    Minimum length of structure payload
  *    NLA_U8, NLA_U16,
  *    NLA_U32, NLA_U64,
  *    NLA_S8, NLA_S16,

lib/nlattr.c

@@ -140,17 +140,6 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
 			return -ERANGE;
 		break;
 
-	case NLA_NESTED_COMPAT:
-		if (attrlen < pt->len)
-			return -ERANGE;
-		if (attrlen < NLA_ALIGN(pt->len))
-			break;
-		if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN)
-			return -ERANGE;
-		nla = nla_data(nla) + NLA_ALIGN(pt->len);
-		if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN + nla_len(nla))
-			return -ERANGE;
-		break;
 	case NLA_NESTED:
 		/* a nested attributes is allowed to be empty; if its not,
 		 * it must have a size of at least NLA_HDRLEN.