36f959c491
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>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/* This is a module which is used to mark packets for tracing.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter/x_tables.h>
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#include <net/netfilter/nf_log.h>
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MODULE_DESCRIPTION("Xtables: packet flow tracing");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_TRACE");
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MODULE_ALIAS("ip6t_TRACE");
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static int trace_tg_check(const struct xt_tgchk_param *par)
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{
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return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
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}
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static void trace_tg_destroy(const struct xt_tgdtor_param *par)
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{
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nf_logger_put(par->family, NF_LOG_TYPE_LOG);
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}
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static unsigned int
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trace_tg(struct sk_buff *skb, const struct xt_action_param *par)
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{
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skb->nf_trace = 1;
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return XT_CONTINUE;
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}
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static struct xt_target trace_tg_reg __read_mostly = {
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.name = "TRACE",
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.revision = 0,
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.family = NFPROTO_UNSPEC,
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.table = "raw",
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.target = trace_tg,
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.checkentry = trace_tg_check,
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.destroy = trace_tg_destroy,
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.me = THIS_MODULE,
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};
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static int __init trace_tg_init(void)
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{
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return xt_register_target(&trace_tg_reg);
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}
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static void __exit trace_tg_exit(void)
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{
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xt_unregister_target(&trace_tg_reg);
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}
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module_init(trace_tg_init);
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module_exit(trace_tg_exit);
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