netfilter: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/ipset/ip_set_core.c

@@ -1386,7 +1386,7 @@ ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb)
 				goto next_set;
 			if (set->variant->uref)
 				set->variant->uref(set, cb, true);
-			/* Fall through and add elements */
+			/* fall through */
 		default:
 			rcu_read_lock_bh();
 			ret = set->variant->list(set, skb, cb);

net/netfilter/ipvs/ip_vs_proto_tcp.c

@@ -315,6 +315,7 @@ tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp)
 	switch (skb->ip_summed) {
 	case CHECKSUM_NONE:
 		skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
+		/* fall through */
 	case CHECKSUM_COMPLETE:
 #ifdef CONFIG_IP_VS_IPV6
 		if (af == AF_INET6) {

net/netfilter/ipvs/ip_vs_proto_udp.c

@@ -319,6 +319,7 @@ udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp)
 		case CHECKSUM_NONE:
 			skb->csum = skb_checksum(skb, udphoff,
 						 skb->len - udphoff, 0);
+			/* fall through */
 		case CHECKSUM_COMPLETE:
 #ifdef CONFIG_IP_VS_IPV6
 			if (af == AF_INET6) {

net/netfilter/nf_conntrack_h323_asn1.c

@@ -262,12 +262,15 @@ static unsigned int get_uint(struct bitstr *bs, int b)
 	case 4:
 		v |= *bs->cur++;
 		v <<= 8;
+		/* fall through */
 	case 3:
 		v |= *bs->cur++;
 		v <<= 8;
+		/* fall through */
 	case 2:
 		v |= *bs->cur++;
 		v <<= 8;
+		/* fall through */
 	case 1:
 		v |= *bs->cur++;
 		break;

net/netfilter/nft_cmp.c

@@ -44,6 +44,7 @@ static void nft_cmp_eval(const struct nft_expr *expr,
 	case NFT_CMP_LT:
 		if (d == 0)
 			goto mismatch;
+		/* fall through */
 	case NFT_CMP_LTE:
 		if (d > 0)
 			goto mismatch;
@@ -51,6 +52,7 @@ static void nft_cmp_eval(const struct nft_expr *expr,
 	case NFT_CMP_GT:
 		if (d == 0)
 			goto mismatch;
+		/* fall through */
 	case NFT_CMP_GTE:
 		if (d < 0)
 			goto mismatch;

net/netfilter/x_tables.c

@@ -1397,7 +1397,7 @@ static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos,
 		trav->curr = trav->curr->next;
 		if (trav->curr != trav->head)
 			break;
-		/* fallthru, _stop will unlock */
+		/* fall through */
 	default:
 		return NULL;
 	}