| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* This is a module which is used to mark packets for tracing. |
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| 3 | */ |
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| 4 | #include <linux/module.h> |
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| 5 | #include <linux/skbuff.h> |
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| 6 | |
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| 7 | #include <linux/netfilter/x_tables.h> |
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| 8 | #include <net/netfilter/nf_log.h> |
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| 9 | |
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| 10 | MODULE_DESCRIPTION("Xtables: packet flow tracing" ); |
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| 11 | MODULE_LICENSE("GPL" ); |
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| 12 | MODULE_ALIAS("ipt_TRACE" ); |
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| 13 | MODULE_ALIAS("ip6t_TRACE" ); |
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| 14 | |
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| 15 | static int trace_tg_check(const struct xt_tgchk_param *par) |
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| 16 | { |
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| 17 | return nf_logger_find_get(pf: par->family, type: NF_LOG_TYPE_LOG); |
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| 18 | } |
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| 19 | |
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| 20 | static void trace_tg_destroy(const struct xt_tgdtor_param *par) |
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| 21 | { |
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| 22 | nf_logger_put(pf: par->family, type: NF_LOG_TYPE_LOG); |
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| 23 | } |
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| 24 | |
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| 25 | static unsigned int |
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| 26 | trace_tg(struct sk_buff *skb, const struct xt_action_param *par) |
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| 27 | { |
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| 28 | skb->nf_trace = 1; |
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| 29 | return XT_CONTINUE; |
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| 30 | } |
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| 31 | |
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| 32 | static struct xt_target trace_tg_reg __read_mostly = { |
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| 33 | .name = "TRACE" , |
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| 34 | .revision = 0, |
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| 35 | .family = NFPROTO_UNSPEC, |
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| 36 | .table = "raw" , |
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| 37 | .target = trace_tg, |
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| 38 | .checkentry = trace_tg_check, |
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| 39 | .destroy = trace_tg_destroy, |
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| 40 | .me = THIS_MODULE, |
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| 41 | }; |
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| 42 | |
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| 43 | static int __init trace_tg_init(void) |
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| 44 | { |
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| 45 | return xt_register_target(target: &trace_tg_reg); |
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| 46 | } |
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| 47 | |
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| 48 | static void __exit trace_tg_exit(void) |
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| 49 | { |
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| 50 | xt_unregister_target(target: &trace_tg_reg); |
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| 51 | } |
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| 52 | |
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| 53 | module_init(trace_tg_init); |
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| 54 | module_exit(trace_tg_exit); |
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| 55 | MODULE_SOFTDEP("pre: nf_log_syslog" ); |
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| 56 | |
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