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Date: Tue, 27 Jul 2021 14:00:00 -0500
From: Kyle Bowman <kbowman@...udflare.com>
To: unlisted-recipients:; (no To-header on input)
Cc: kernel-team@...udflare.com, Alex Forster <aforster@...udflare.com>,
Kyle Bowman <kbowman@...udflare.com>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH] netfilter: xt_NFLOG: allow 128 character log prefixes
From: Alex Forster <aforster@...udflare.com>
nftables defines NF_LOG_PREFIXLEN as 128 characters, while iptables
limits the NFLOG prefix to 64 characters. In order to eventually make
the two consistent, introduce a v1 target revision of xt_NFLOG that
allows userspace to provide a 128 character NFLOG prefix.
Signed-off-by: Alex Forster <aforster@...udflare.com>
Signed-off-by: Kyle Bowman <kbowman@...udflare.com>
---
include/uapi/linux/netfilter/xt_NFLOG.h | 11 ++++
net/netfilter/xt_NFLOG.c | 73 +++++++++++++++++++++----
2 files changed, 73 insertions(+), 11 deletions(-)
diff --git a/include/uapi/linux/netfilter/xt_NFLOG.h b/include/uapi/linux/netfilter/xt_NFLOG.h
index 517809771909..3f1119a2e522 100644
--- a/include/uapi/linux/netfilter/xt_NFLOG.h
+++ b/include/uapi/linux/netfilter/xt_NFLOG.h
@@ -3,6 +3,7 @@
#define _XT_NFLOG_TARGET
#include <linux/types.h>
+#include <linux/netfilter/nf_log.h>
#define XT_NFLOG_DEFAULT_GROUP 0x1
#define XT_NFLOG_DEFAULT_THRESHOLD 0
@@ -22,4 +23,14 @@ struct xt_nflog_info {
char prefix[64];
};
+struct xt_nflog_info_v1 {
+ /* 'len' will be used iff you set XT_NFLOG_F_COPY_LEN in flags */
+ __u32 len;
+ __u16 group;
+ __u16 threshold;
+ __u16 flags;
+ __u16 pad;
+ char prefix[NF_LOG_PREFIXLEN];
+};
+
#endif /* _XT_NFLOG_TARGET */
diff --git a/net/netfilter/xt_NFLOG.c b/net/netfilter/xt_NFLOG.c
index fb5793208059..82279a6be0ff 100644
--- a/net/netfilter/xt_NFLOG.c
+++ b/net/netfilter/xt_NFLOG.c
@@ -39,6 +39,28 @@ nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
return XT_CONTINUE;
}
+static unsigned int
+nflog_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct xt_nflog_info_v1 *info = par->targinfo;
+ struct net *net = xt_net(par);
+ struct nf_loginfo li;
+
+ li.type = NF_LOG_TYPE_ULOG;
+ li.u.ulog.copy_len = info->len;
+ li.u.ulog.group = info->group;
+ li.u.ulog.qthreshold = info->threshold;
+ li.u.ulog.flags = 0;
+
+ if (info->flags & XT_NFLOG_F_COPY_LEN)
+ li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
+
+ nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
+ xt_out(par), &li, "%s", info->prefix);
+
+ return XT_CONTINUE;
+}
+
static int nflog_tg_check(const struct xt_tgchk_param *par)
{
const struct xt_nflog_info *info = par->targinfo;
@@ -51,30 +73,59 @@ static int nflog_tg_check(const struct xt_tgchk_param *par)
return nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
}
+static int nflog_tg_check_v1(const struct xt_tgchk_param *par)
+{
+ const struct xt_nflog_info_v1 *info = par->targinfo;
+
+ if (info->flags & ~XT_NFLOG_MASK)
+ return -EINVAL;
+ if (info->prefix[sizeof(info->prefix) - 1] != '\0')
+ return -EINVAL;
+
+ return nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
+}
+
static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
{
nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
}
-static struct xt_target nflog_tg_reg __read_mostly = {
- .name = "NFLOG",
- .revision = 0,
- .family = NFPROTO_UNSPEC,
- .checkentry = nflog_tg_check,
- .destroy = nflog_tg_destroy,
- .target = nflog_tg,
- .targetsize = sizeof(struct xt_nflog_info),
- .me = THIS_MODULE,
+static void nflog_tg_destroy_v1(const struct xt_tgdtor_param *par)
+{
+ nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
+}
+
+static struct xt_target nflog_tg_reg[] __read_mostly = {
+ {
+ .name = "NFLOG",
+ .revision = 0,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = nflog_tg_check,
+ .destroy = nflog_tg_destroy,
+ .target = nflog_tg,
+ .targetsize = sizeof(struct xt_nflog_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "NFLOG",
+ .revision = 1,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = nflog_tg_check_v1,
+ .destroy = nflog_tg_destroy_v1,
+ .target = nflog_tg_v1,
+ .targetsize = sizeof(struct xt_nflog_info_v1),
+ .me = THIS_MODULE,
+ }
};
static int __init nflog_tg_init(void)
{
- return xt_register_target(&nflog_tg_reg);
+ return xt_register_targets(nflog_tg_reg, ARRAY_SIZE(nflog_tg_reg));
}
static void __exit nflog_tg_exit(void)
{
- xt_unregister_target(&nflog_tg_reg);
+ xt_unregister_targets(nflog_tg_reg, ARRAY_SIZE(nflog_tg_reg));
}
module_init(nflog_tg_init);
--
2.32.0
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