netfilter: xtables: change matches to return error code

The following semantic patch does part of the transformation:
// <smpl>
@ rule1 @
struct xt_match ops;
identifier check;
@@
 ops.checkentry = check;

@@
identifier rule1.check;
@@
 check(...) { <...
-return true;
+return 0;
 ...> }

@@
identifier rule1.check;
@@
 check(...) { <...
-return false;
+return -EINVAL;
 ...> }
// </smpl>

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/net/ipv4/netfilter/ipt_addrtype.c b/net/ipv4/netfilter/ipt_addrtype.c
index 81197f4..e4b8f2b 100644
--- a/net/ipv4/netfilter/ipt_addrtype.c
+++ b/net/ipv4/netfilter/ipt_addrtype.c
@@ -78,7 +78,7 @@ static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par)
 	    info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
 		pr_info("both incoming and outgoing "
 			"interface limitation cannot be selected\n");
-		return false;
+		return -EINVAL;
 	}
 
 	if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) |
@@ -86,7 +86,7 @@ static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par)
 	    info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
 		pr_info("output interface limitation "
 			"not valid in PREROUTING and INPUT\n");
-		return false;
+		return -EINVAL;
 	}
 
 	if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) |
@@ -94,10 +94,10 @@ static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par)
 	    info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN) {
 		pr_info("input interface limitation "
 			"not valid in POSTROUTING and OUTPUT\n");
-		return false;
+		return -EINVAL;
 	}
 
-	return true;
+	return 0;
 }
 
 static struct xt_match addrtype_mt_reg[] __read_mostly = {