FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_ipip.h

     /*      $OpenBSD: ip_ipip.h,v 1.13 2021/10/13 14:36:31 bluhm Exp $ */
     /*
      * The authors of this code are John Ioannidis (ji@tla.org),
      * Angelos D. Keromytis (kermit@csd.uch.gr) and
      * Niels Provos (provos@physnet.uni-hamburg.de).
      *
      * The original version of this code was written by John Ioannidis
      * for BSD/OS in Athens, Greece, in November 1995.
      *
     * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
     * by Angelos D. Keromytis.
     *
     * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
     * and Niels Provos.
     *
     * Additional features in 1999 by Angelos D. Keromytis.
     *
     * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
     * Angelos D. Keromytis and Niels Provos.
     * Copyright (c) 2001, Angelos D. Keromytis.
     *
     * Permission to use, copy, and modify this software with or without fee
     * is hereby granted, provided that this entire notice is included in
     * all copies of any software which is or includes a copy or
     * modification of this software.
     * You may use this code under the GNU public license if you so wish. Please
     * contribute changes back to the authors under this freer than GPL license
     * so that we may further the use of strong encryption without limitations to
     * all.
     *
     * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
     * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
     * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
     * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
     * PURPOSE.
     */
    
    #ifndef _NETINET_IPIP_H_
    #define _NETINET_IPIP_H_
    
    /*
     * IP-inside-IP processing.
     * Not quite all the functionality of RFC-1853, but the main idea is there.
     */
    
    struct ipipstat {
        u_int64_t   ipips_ipackets;         /* total input packets */
        u_int64_t   ipips_opackets;         /* total output packets */
        u_int64_t   ipips_hdrops;           /* packet shorter than header shows */
        u_int64_t   ipips_qfull;
        u_int64_t   ipips_ibytes;
        u_int64_t   ipips_obytes;
        u_int64_t   ipips_pdrops;           /* packet dropped due to policy */
        u_int64_t   ipips_spoof;            /* IP spoofing attempts */
        u_int64_t   ipips_family;           /* Protocol family mismatch */
        u_int64_t   ipips_unspec;            /* Missing tunnel endpoint address */
    };
    
    #define IP4_DEFAULT_TTL    0
    #define IP4_SAME_TTL      -1
    
    /*
     * Names for IPIP sysctl objects
     */
    #define IPIPCTL_ALLOW   1               /* accept incoming IP4 packets */
    #define IPIPCTL_STATS   2               /* IPIP stats */
    #define IPIPCTL_MAXID   3
    
    #define IPIPCTL_NAMES { \
            { 0, 0 }, \
            { "allow", CTLTYPE_INT }, \
            { "stats", CTLTYPE_STRUCT }, \
    }
    
    #ifdef _KERNEL
    
    #include <sys/percpu.h>
    
    enum ipipstat_counters {
            ipips_ipackets,
            ipips_opackets,
            ipips_hdrops,
            ipips_qfull,
            ipips_ibytes,
            ipips_obytes,
            ipips_pdrops,
            ipips_spoof,
            ipips_family,
            ipips_unspec,
            ipips_ncounters
    };
    
    extern struct cpumem *ipipcounters;
    
    static inline void
    ipipstat_inc(enum ipipstat_counters c)
    {
            counters_inc(ipipcounters, c);
    }
   
   static inline void
   ipipstat_add(enum ipipstat_counters c, uint64_t v)
   {
           counters_add(ipipcounters, c, v);
   }
   
   static inline void
   ipipstat_pkt(enum ipipstat_counters p, enum ipipstat_counters b, uint64_t v)
   {
           counters_pkt(ipipcounters, p, b, v);
   }
   
   struct tdb;
   
   void    ipip_init(void);
   int     ipip_input(struct mbuf **, int *, int, int);
   int     ipip_input_if(struct mbuf **, int *, int, int, struct ifnet *);
   int     ipip_output(struct mbuf **, struct tdb *);
   int     ipip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
   
   extern int ipip_allow;
   #endif /* _KERNEL */
   #endif /* _NETINET_IPIP_H_ */

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