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Date: Tue, 11 Jan 2022 10:46:49 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: trix@...hat.com
Cc: kadlec@...filter.org, fw@...len.de, davem@...emloft.net,
kuba@...nel.org, netfilter-devel@...r.kernel.org,
coreteam@...filter.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: extend CONFIG_NF_CONNTRACK compile time checks
Hi,
On Sat, Dec 25, 2021 at 09:37:44AM -0800, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
>
> Extends
> commit 83ace77f5117 ("netfilter: ctnetlink: remove get_ct indirection")
>
> Add some compile time checks by following the ct and ctinfo variables
> that are only set when CONFIG_NF_CONNTRACK is enabled.
>
> In nfulnl_log_packet(), ct is only set when CONFIG_NF_CONNTRACK
> is enabled. ct's later use in __build_packet_message() is only
> meaningful when CONFIG_NF_CONNTRACK is enabled, so add a check.
>
> In nfqnl_build_packet_message(), ct and ctinfo are only set when
> CONFIG_NF_CONNTRACK is enabled. Add a check for their decl and use.
>
> nfqnl_ct_parse() is a static function, move the check to the whole
> function.
>
> In nfqa_parse_bridge(), ct and ctinfo are only set by the only
> call to nfqnl_ct_parse(), so add a check for their decl and use.
>
> Consistently initialize ctinfo to 0.
Are compile warning being trigger without this patch, maybe with
CONFIG_NF_CONNTRACK=n?
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
> net/netfilter/nfnetlink_log.c | 4 +++-
> net/netfilter/nfnetlink_queue.c | 18 +++++++++++++-----
> 2 files changed, 16 insertions(+), 6 deletions(-)
>
> diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
> index ae9c0756bba59..e79d152184b71 100644
> --- a/net/netfilter/nfnetlink_log.c
> +++ b/net/netfilter/nfnetlink_log.c
> @@ -627,9 +627,11 @@ __build_packet_message(struct nfnl_log_net *log,
> htonl(atomic_inc_return(&log->global_seq))))
> goto nla_put_failure;
>
> +#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> if (ct && nfnl_ct->build(inst->skb, ct, ctinfo,
> NFULA_CT, NFULA_CT_INFO) < 0)
> goto nla_put_failure;
> +#endif
>
> if ((pf == NFPROTO_NETDEV || pf == NFPROTO_BRIDGE) &&
> nfulnl_put_bridge(inst, skb) < 0)
> @@ -689,7 +691,7 @@ nfulnl_log_packet(struct net *net,
> struct nfnl_log_net *log = nfnl_log_pernet(net);
> const struct nfnl_ct_hook *nfnl_ct = NULL;
> struct nf_conn *ct = NULL;
> - enum ip_conntrack_info ctinfo;
> + enum ip_conntrack_info ctinfo = 0;
>
> if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
> li = li_user;
> diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
> index 44c3de176d186..d59cae7561bf8 100644
> --- a/net/netfilter/nfnetlink_queue.c
> +++ b/net/netfilter/nfnetlink_queue.c
> @@ -386,8 +386,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
> struct sk_buff *entskb = entry->skb;
> struct net_device *indev;
> struct net_device *outdev;
> +#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> struct nf_conn *ct = NULL;
> enum ip_conntrack_info ctinfo = 0;
> +#endif
> struct nfnl_ct_hook *nfnl_ct;
> bool csum_verify;
> char *secdata = NULL;
> @@ -595,8 +597,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
> if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
> goto nla_put_failure;
>
> +#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
> goto nla_put_failure;
> +#endif
>
> if (cap_len > data_len &&
> nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
> @@ -1104,13 +1108,13 @@ static int nfqnl_recv_verdict_batch(struct sk_buff *skb,
> return 0;
> }
>
> +#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
> const struct nlmsghdr *nlh,
> const struct nlattr * const nfqa[],
> struct nf_queue_entry *entry,
> enum ip_conntrack_info *ctinfo)
> {
> -#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> struct nf_conn *ct;
>
> ct = nf_ct_get(entry->skb, ctinfo);
> @@ -1125,10 +1129,8 @@ static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
> NETLINK_CB(entry->skb).portid,
> nlmsg_report(nlh));
> return ct;
> -#else
> - return NULL;
> -#endif
> }
> +#endif
>
> static int nfqa_parse_bridge(struct nf_queue_entry *entry,
> const struct nlattr * const nfqa[])
> @@ -1172,11 +1174,13 @@ static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info,
> struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
> u_int16_t queue_num = ntohs(info->nfmsg->res_id);
> struct nfqnl_msg_verdict_hdr *vhdr;
> - enum ip_conntrack_info ctinfo;
> struct nfqnl_instance *queue;
> struct nf_queue_entry *entry;
> struct nfnl_ct_hook *nfnl_ct;
> +#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> struct nf_conn *ct = NULL;
> + enum ip_conntrack_info ctinfo = 0;
> +#endif
> unsigned int verdict;
> int err;
>
> @@ -1198,11 +1202,13 @@ static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info,
> /* rcu lock already held from nfnl->call_rcu. */
> nfnl_ct = rcu_dereference(nfnl_ct_hook);
>
> +#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> if (nfqa[NFQA_CT]) {
> if (nfnl_ct != NULL)
> ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry,
> &ctinfo);
> }
> +#endif
>
> if (entry->state.pf == PF_BRIDGE) {
> err = nfqa_parse_bridge(entry, nfqa);
> @@ -1218,8 +1224,10 @@ static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info,
> payload_len, entry, diff) < 0)
> verdict = NF_DROP;
>
> +#if IS_ENABLED(CONFIG_NF_CONNTRACK)
> if (ct && diff)
> nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
> +#endif
> }
>
> if (nfqa[NFQA_MARK])
> --
> 2.26.3
>
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