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netfilter: xt_TRACE: add explicitly nf_logger_find_get call

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Consider such situation, if nf_log_ipv4 kernel module is not installed,
and the user add a following iptables rule:
  # iptables -t raw -I PREROUTING -j TRACE

There will be no trace log generated until the user install nf_log_ipv4
module manully. So we should add request related nf_log module
appropriately here.

Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2016-06-08 20:43:19 +08:00 committed by Pablo Neira Ayuso
parent f3bb53338e
commit 36f959c491
1 changed files with 19 additions and 6 deletions
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25
net/netfilter/xt_TRACE.c
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@ -4,12 +4,23 @@
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_log.h>
MODULE_DESCRIPTION("Xtables: packet flow tracing");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_TRACE");
MODULE_ALIAS("ip6t_TRACE");
static int trace_tg_check(const struct xt_tgchk_param *par)
{
return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
}
static void trace_tg_destroy(const struct xt_tgdtor_param *par)
{
nf_logger_put(par->family, NF_LOG_TYPE_LOG);
}
static unsigned int
trace_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
@ -18,12 +29,14 @@ trace_tg(struct sk_buff *skb, const struct xt_action_param *par)
}
static struct xt_target trace_tg_reg __read_mostly = {
.name = "TRACE",
.revision = 0,
.family = NFPROTO_UNSPEC,
.table = "raw",
.target = trace_tg,
.me = THIS_MODULE,
.name = "TRACE",
.revision = 0,
.family = NFPROTO_UNSPEC,
.table = "raw",
.target = trace_tg,
.checkentry = trace_tg_check,
.destroy = trace_tg_destroy,
.me = THIS_MODULE,
};
static int __init trace_tg_init(void)