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

From: Pablo Neira Ayuso
Date: Wed Jul 08 2020 - 12:09:41 EST

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On Tue, Jul 07, 2020 at 02:47:17PM -0500, Gustavo A. R. Silva wrote:
> 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.

I suggest:

netfilter: Use fallthrough pseudo-keyword

instead, since this is also updating iptables and ipset codebase.

More comments below, thanks.

> [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 */
^^^^^^^^^^^^^^^^
Remove this too ?

> 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 */

Remove this /* same */, it refers to /* fallthrough */

> case NFPROTO_INET:
> help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4,

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