[PATCH][next] netfilter: nf_tables: Use fallthrough pseudo-keyword

From: Gustavo A. R. Silva
Date: Tue Jul 07 2020 - 15:41:57 EST

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Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
net/bridge/netfilter/ebtables.c | 2 +-
net/netfilter/ipset/ip_set_core.c | 2 +-
net/netfilter/nf_conntrack_h323_asn1.c | 6 +++---
net/netfilter/nf_conntrack_proto.c | 2 +-
net/netfilter/nf_conntrack_proto_tcp.c | 2 +-
net/netfilter/nf_conntrack_standalone.c | 2 +-
net/netfilter/nf_nat_core.c | 10 +++++-----
net/netfilter/nf_synproxy_core.c | 6 ++----
net/netfilter/nf_tables_api.c | 8 ++++----
net/netfilter/nf_tables_core.c | 2 +-
net/netfilter/nfnetlink_cttimeout.c | 2 +-
net/netfilter/nft_cmp.c | 4 ++--
net/netfilter/nft_ct.c | 4 ++--
net/netfilter/nft_fib.c | 2 +-
net/netfilter/nft_payload.c | 2 +-
net/netfilter/utils.c | 8 ++++----
net/netfilter/x_tables.c | 2 +-
17 files changed, 32 insertions(+), 34 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index c83ffe912163..38e946fdd041 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1935,7 +1935,7 @@ static int compat_mtw_from_user(const struct compat_ebt_entry_mwt *mwt,
size_kern = match_size;
module_put(match->me);
break;
- case EBT_COMPAT_WATCHER: /* fallthrough */
+ case EBT_COMPAT_WATCHER:
case EBT_COMPAT_TARGET:
wt = xt_request_find_target(NFPROTO_BRIDGE, name,
mwt->u.revision);
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 340cb955af25..7d1f6d2da3f1 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -1642,7 +1642,7 @@ ip_set_dump_do(struct sk_buff *skb, struct netlink_callback *cb)
goto next_set;
if (set->variant->uref)
set->variant->uref(set, cb, true);
- /* fall through */
+ fallthrough;
default:
ret = set->variant->list(set, skb, cb);
if (!cb->args[IPSET_CB_ARG0])
diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c
index 573cb4481481..e697a824b001 100644
--- a/net/netfilter/nf_conntrack_h323_asn1.c
+++ b/net/netfilter/nf_conntrack_h323_asn1.c
@@ -257,15 +257,15 @@ static unsigned int get_uint(struct bitstr *bs, int b)
case 4:
v |= *bs->cur++;
v <<= 8;
- /* fall through */
+ fallthrough;
case 3:
v |= *bs->cur++;
v <<= 8;
- /* fall through */
+ fallthrough;
case 2:
v |= *bs->cur++;
v <<= 8;
- /* fall through */
+ fallthrough;
case 1:
v |= *bs->cur++;
break;
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index a0560d175a7f..95f79980348c 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -610,7 +610,7 @@ void nf_ct_netns_put(struct net *net, uint8_t nfproto)
switch (nfproto) {
case NFPROTO_BRIDGE:
nf_ct_netns_do_put(net, NFPROTO_BRIDGE);
- /* fall through */
+ fallthrough;
case NFPROTO_INET:
nf_ct_netns_do_put(net, NFPROTO_IPV4);
nf_ct_netns_do_put(net, NFPROTO_IPV6);
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 1926fd56df56..6892e497781c 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -900,7 +900,7 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
return -NF_REPEAT;
return NF_DROP;
}
- /* Fall through */
+ fallthrough;
case TCP_CONNTRACK_IGNORE:
/* Ignored packets:
*
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 6a26299cb064..a604f43e3e6b 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -60,7 +60,7 @@ print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
ntohs(tuple->src.u.tcp.port),
ntohs(tuple->dst.u.tcp.port));
break;
- case IPPROTO_UDPLITE: /* fallthrough */
+ case IPPROTO_UDPLITE:
case IPPROTO_UDP:
seq_printf(s, "sport=%hu dport=%hu ",
ntohs(tuple->src.u.udp.port),
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index bfc555fcbc72..c2f1bcb8f8e6 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -408,7 +408,7 @@ static void nf_nat_l4proto_unique_tuple(struct nf_conntrack_tuple *tuple,
static const unsigned int max_attempts = 128;

switch (tuple->dst.protonum) {
- case IPPROTO_ICMP: /* fallthrough */
+ case IPPROTO_ICMP:
case IPPROTO_ICMPV6:
/* id is same for either direction... */
keyptr = &tuple->src.u.icmp.id;
@@ -442,10 +442,10 @@ static void nf_nat_l4proto_unique_tuple(struct nf_conntrack_tuple *tuple,
}
goto find_free_id;
#endif
- case IPPROTO_UDP: /* fallthrough */
- case IPPROTO_UDPLITE: /* fallthrough */
- case IPPROTO_TCP: /* fallthrough */
- case IPPROTO_SCTP: /* fallthrough */
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ case IPPROTO_TCP:
+ case IPPROTO_SCTP:
case IPPROTO_DCCP: /* fallthrough */
if (maniptype == NF_NAT_MANIP_SRC)
keyptr = &tuple->src.u.all;
diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c
index b9cbe1e2453e..e911635d9ccb 100644
--- a/net/netfilter/nf_synproxy_core.c
+++ b/net/netfilter/nf_synproxy_core.c
@@ -704,8 +704,7 @@ ipv4_synproxy_hook(void *priv, struct sk_buff *skb,
nf_ct_seqadj_init(ct, ctinfo, 0);
synproxy->tsoff = 0;
this_cpu_inc(snet->stats->conn_reopened);
-
- /* fall through */
+ fallthrough;
case TCP_CONNTRACK_SYN_SENT:
if (!synproxy_parse_options(skb, thoff, th, &opts))
return NF_DROP;
@@ -1128,8 +1127,7 @@ ipv6_synproxy_hook(void *priv, struct sk_buff *skb,
nf_ct_seqadj_init(ct, ctinfo, 0);
synproxy->tsoff = 0;
this_cpu_inc(snet->stats->conn_reopened);
-
- /* fall through */
+ fallthrough;
case TCP_CONNTRACK_SYN_SENT:
if (!synproxy_parse_options(skb, thoff, th, &opts))
return NF_DROP;
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 7647ecfa0d40..f4c2a37aae8e 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4291,7 +4291,7 @@ void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
case NFT_TRANS_ABORT:
case NFT_TRANS_RELEASE:
set->use--;
- /* fall through */
+ fallthrough;
default:
nf_tables_unbind_set(ctx, set, binding,
phase == NFT_TRANS_COMMIT);
@@ -6159,7 +6159,7 @@ void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
case NFT_TRANS_ABORT:
case NFT_TRANS_RELEASE:
flowtable->use--;
- /* fall through */
+ fallthrough;
default:
return;
}
@@ -7165,7 +7165,7 @@ static int nf_tables_validate(struct net *net)
break;
case NFT_VALIDATE_NEED:
nft_validate_state_update(net, NFT_VALIDATE_DO);
- /* fall through */
+ fallthrough;
case NFT_VALIDATE_DO:
list_for_each_entry(table, &net->nft.tables, list) {
if (nft_table_validate(net, table) < 0)
@@ -8234,7 +8234,7 @@ static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
default:
return -EINVAL;
}
- /* fall through */
+ fallthrough;
case NFT_CONTINUE:
case NFT_BREAK:
case NFT_RETURN:
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 96c74c4c7176..587897a2498b 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -213,7 +213,7 @@ nft_do_chain(struct nft_pktinfo *pkt, void *priv)
jumpstack[stackptr].chain = chain;
jumpstack[stackptr].rules = rules + 1;
stackptr++;
- /* fall through */
+ fallthrough;
case NFT_GOTO:
nft_trace_packet(&info, chain, rule,
NFT_TRACETYPE_RULE);
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index da915c224a82..89a381f7f945 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -451,7 +451,7 @@ static int cttimeout_default_get(struct net *net, struct sock *ctnl,
case IPPROTO_TCP:
timeouts = nf_tcp_pernet(net)->timeouts;
break;
- case IPPROTO_UDP: /* fallthrough */
+ case IPPROTO_UDP:
case IPPROTO_UDPLITE:
timeouts = nf_udp_pernet(net)->timeouts;
break;
diff --git a/net/netfilter/nft_cmp.c b/net/netfilter/nft_cmp.c
index 8a28c127effc..16f4d84599ac 100644
--- a/net/netfilter/nft_cmp.c
+++ b/net/netfilter/nft_cmp.c
@@ -43,7 +43,7 @@ void nft_cmp_eval(const struct nft_expr *expr,
case NFT_CMP_LT:
if (d == 0)
goto mismatch;
- /* fall through */
+ fallthrough;
case NFT_CMP_LTE:
if (d > 0)
goto mismatch;
@@ -51,7 +51,7 @@ void nft_cmp_eval(const struct nft_expr *expr,
case NFT_CMP_GT:
if (d == 0)
goto mismatch;
- /* fall through */
+ fallthrough;
case NFT_CMP_GTE:
if (d < 0)
goto mismatch;
diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
index faea72c2df32..8b65be8a29e3 100644
--- a/net/netfilter/nft_ct.c
+++ b/net/netfilter/nft_ct.c
@@ -129,7 +129,7 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
return;
}
#endif
- case NFT_CT_BYTES: /* fallthrough */
+ case NFT_CT_BYTES:
case NFT_CT_PKTS: {
const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
u64 count = 0;
@@ -1013,7 +1013,7 @@ static int nft_ct_helper_obj_init(const struct nft_ctx *ctx,
help6 = nf_conntrack_helper_try_module_get(name, family,
priv->l4proto);
break;
- case NFPROTO_NETDEV: /* fallthrough */
+ case NFPROTO_NETDEV:
case NFPROTO_BRIDGE: /* same */
case NFPROTO_INET:
help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4,
diff --git a/net/netfilter/nft_fib.c b/net/netfilter/nft_fib.c
index cfac0964f48d..4dfdaeaf09a5 100644
--- a/net/netfilter/nft_fib.c
+++ b/net/netfilter/nft_fib.c
@@ -32,7 +32,7 @@ int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
unsigned int hooks;

switch (priv->result) {
- case NFT_FIB_RESULT_OIF: /* fallthrough */
+ case NFT_FIB_RESULT_OIF:
case NFT_FIB_RESULT_OIFNAME:
hooks = (1 << NF_INET_PRE_ROUTING);
break;
diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c
index a7de3a58f553..ed7cb9f747f6 100644
--- a/net/netfilter/nft_payload.c
+++ b/net/netfilter/nft_payload.c
@@ -467,7 +467,7 @@ static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt,
case IPPROTO_UDP:
if (!nft_payload_udp_checksum(skb, pkt->xt.thoff))
return -1;
- /* Fall through. */
+ fallthrough;
case IPPROTO_UDPLITE:
*l4csum_offset = offsetof(struct udphdr, check);
break;
diff --git a/net/netfilter/utils.c b/net/netfilter/utils.c
index 51b454d8fa9c..cedf47ab3c6f 100644
--- a/net/netfilter/utils.c
+++ b/net/netfilter/utils.c
@@ -25,7 +25,7 @@ __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
- /* fall through */
+ fallthrough;
case CHECKSUM_NONE:
if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP)
skb->csum = 0;
@@ -51,7 +51,7 @@ static __sum16 nf_ip_checksum_partial(struct sk_buff *skb, unsigned int hook,
case CHECKSUM_COMPLETE:
if (len == skb->len - dataoff)
return nf_ip_checksum(skb, hook, dataoff, protocol);
- /* fall through */
+ fallthrough;
case CHECKSUM_NONE:
skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, protocol,
skb->len - dataoff, 0);
@@ -79,7 +79,7 @@ __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
- /* fall through */
+ fallthrough;
case CHECKSUM_NONE:
skb->csum = ~csum_unfold(
csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
@@ -106,7 +106,7 @@ static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook,
case CHECKSUM_COMPLETE:
if (len == skb->len - dataoff)
return nf_ip6_checksum(skb, hook, dataoff, protocol);
- /* fall through */
+ fallthrough;
case CHECKSUM_NONE:
hsum = skb_checksum(skb, 0, dataoff, 0);
skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 99a468be4a59..8b2daccaf8df 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1571,7 +1571,7 @@ 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;
- /* fall through */
+ fallthrough;
default:
return NULL;
}

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