netfilter: nft_compat: don't truncate ethernet protocol type to u8

Use u16 for protocol and then cast it to __be16

>> net/netfilter/nft_compat.c:140:37: sparse: incorrect type in assignment (different base types)
   net/netfilter/nft_compat.c:140:37:    expected restricted __be16 [usertype] ethproto
   net/netfilter/nft_compat.c:140:37:    got unsigned char [unsigned] [usertype] proto
>> net/netfilter/nft_compat.c:351:37: sparse: incorrect type in assignment (different base types)
   net/netfilter/nft_compat.c:351:37:    expected restricted __be16 [usertype] ethproto
   net/netfilter/nft_compat.c:351:37:    got unsigned char [unsigned] [usertype] proto

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index 1279cd8..213584c 100644 (file)
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -123,7 +123,7 @@ static void
 nft_target_set_tgchk_param(struct xt_tgchk_param *par,
                           const struct nft_ctx *ctx,
                           struct xt_target *target, void *info,
-                          union nft_entry *entry, u8 proto, bool inv)
+                          union nft_entry *entry, u16 proto, bool inv)
 {
        par->net        = ctx->net;
        par->table      = ctx->table->name;
@@ -137,7 +137,7 @@ nft_target_set_tgchk_param(struct xt_tgchk_param *par,
                entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
                break;
        case NFPROTO_BRIDGE:
-               entry->ebt.ethproto = proto;
+               entry->ebt.ethproto = (__force __be16)proto;
                entry->ebt.invflags = inv ? EBT_IPROTO : 0;
                break;
        }
@@ -171,7 +171,7 @@ static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1]
        [NFTA_RULE_COMPAT_FLAGS]        = { .type = NLA_U32 },
 };
 
-static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv)
+static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
 {
        struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
        u32 flags;
@@ -203,7 +203,7 @@ nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
        struct xt_target *target = expr->ops->data;
        struct xt_tgchk_param par;
        size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
-       u8 proto = 0;
+       u16 proto = 0;
        bool inv = false;
        union nft_entry e = {};
        int ret;
@@ -334,7 +334,7 @@ static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
 static void
 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
                          struct xt_match *match, void *info,
-                         union nft_entry *entry, u8 proto, bool inv)
+                         union nft_entry *entry, u16 proto, bool inv)
 {
        par->net        = ctx->net;
        par->table      = ctx->table->name;
@@ -348,7 +348,7 @@ nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
                entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
                break;
        case NFPROTO_BRIDGE:
-               entry->ebt.ethproto = proto;
+               entry->ebt.ethproto = (__force __be16)proto;
                entry->ebt.invflags = inv ? EBT_IPROTO : 0;
                break;
        }
@@ -385,7 +385,7 @@ nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
        struct xt_match *match = expr->ops->data;
        struct xt_mtchk_param par;
        size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
-       u8 proto = 0;
+       u16 proto = 0;
        bool inv = false;
        union nft_entry e = {};
        int ret;