root/include/uapi/linux/netfilter/xt_l2tp.h

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#ifndef _LINUX_NETFILTER_XT_L2TP_H
#define _LINUX_NETFILTER_XT_L2TP_H

#include <linux/types.h>

enum xt_l2tp_type {
        XT_L2TP_TYPE_CONTROL,
        XT_L2TP_TYPE_DATA,
};

/* L2TP matching stuff */
struct xt_l2tp_info {
        __u32 tid;                      /* tunnel id */
        __u32 sid;                      /* session id */
        __u8 version;                   /* L2TP protocol version */
        __u8 type;                      /* L2TP packet type */
        __u8 flags;                     /* which fields to match */
};

enum {
        XT_L2TP_TID     = (1 << 0),     /* match L2TP tunnel id */
        XT_L2TP_SID     = (1 << 1),     /* match L2TP session id */
        XT_L2TP_VERSION = (1 << 2),     /* match L2TP protocol version */
        XT_L2TP_TYPE    = (1 << 3),     /* match L2TP packet type */
};

#endif /* _LINUX_NETFILTER_XT_L2TP_H */
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