usr/src/sys/netinet/ip_var.h

/*
 * Copyright (c) 1982, 1986, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)ip_var.h    8.2 (Berkeley) %G%
 */

/*
 * Overlay for ip header used by other protocols (tcp, udp).
 */
struct ipovly {
        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
        u_char  ih_x1;                  /* (unused) */
        u_char  ih_pr;                  /* protocol */
        short   ih_len;                 /* protocol length */
        struct  in_addr ih_src;         /* source internet address */
        struct  in_addr ih_dst;         /* destination internet address */
};

/*
 * Ip reassembly queue structure.  Each fragment
 * being reassembled is attached to one of these structures.
 * They are timed out after ipq_ttl drops to 0, and may also
 * be reclaimed if memory becomes tight.
 */
struct ipq {
        struct  ipq *next,*prev;        /* to other reass headers */
        u_char  ipq_ttl;                /* time for reass q to live */
        u_char  ipq_p;                  /* protocol of this fragment */
        u_short ipq_id;                 /* sequence id for reassembly */
        struct  ipasfrag *ipq_next,*ipq_prev;
                                        /* to ip headers of fragments */
        struct  in_addr ipq_src,ipq_dst;
};

/*
 * Ip header, when holding a fragment.
 *
 * Note: ipf_next must be at same offset as ipq_next above
 */
struct  ipasfrag {
#if BYTE_ORDER == LITTLE_ENDIAN
        u_char  ip_hl:4,
                ip_v:4;
#endif
#if BYTE_ORDER == BIG_ENDIAN
        u_char  ip_v:4,
                ip_hl:4;
#endif
        u_char  ipf_mff;                /* XXX overlays ip_tos: use low bit
                                         * to avoid destroying tos;
                                         * copied from (ip_off&IP_MF) */
        short   ip_len;
        u_short ip_id;
        short   ip_off;
        u_char  ip_ttl;
        u_char  ip_p;
        u_short ip_sum;
        struct  ipasfrag *ipf_next;     /* next fragment */
        struct  ipasfrag *ipf_prev;     /* previous fragment */
};

/*
 * Structure stored in mbuf in inpcb.ip_options
 * and passed to ip_output when ip options are in use.
 * The actual length of the options (including ipopt_dst)
 * is in m_len.
 */
#define MAX_IPOPTLEN    40

struct ipoption {
        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
};

/*
 * Structure attached to inpcb.ip_moptions and
 * passed to ip_output when IP multicast options are in use.
 */
struct ip_moptions {
        struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
        u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
        u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
        u_short imo_num_memberships;    /* no. memberships this socket */
        struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
};

struct  ipstat {
        u_long  ips_total;              /* total packets received */
        u_long  ips_badsum;             /* checksum bad */
        u_long  ips_tooshort;           /* packet too short */
        u_long  ips_toosmall;           /* not enough data */
        u_long  ips_badhlen;            /* ip header length < data size */
        u_long  ips_badlen;             /* ip length < ip header length */
        u_long  ips_fragments;          /* fragments received */
        u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
        u_long  ips_fragtimeout;        /* fragments timed out */
        u_long  ips_forward;            /* packets forwarded */
        u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
        u_long  ips_redirectsent;       /* packets forwarded on same net */
        u_long  ips_noproto;            /* unknown or unsupported protocol */
        u_long  ips_delivered;          /* datagrams delivered to upper level*/
        u_long  ips_localout;           /* total ip packets generated here */
        u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
        u_long  ips_reassembled;        /* total packets reassembled ok */
        u_long  ips_fragmented;         /* datagrams sucessfully fragmented */
        u_long  ips_ofragments;         /* output fragments created */
        u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
        u_long  ips_badoptions;         /* error in option processing */
        u_long  ips_noroute;            /* packets discarded due to no route */
        u_long  ips_badvers;            /* ip version != 4 */
        u_long  ips_rawout;             /* total raw ip packets generated */
};

#ifdef KERNEL
/* flags passed to ip_output as last parameter */
#define IP_FORWARDING           0x1             /* most of ip header exists */
#define IP_RAWOUTPUT            0x2             /* raw ip header exists */
#define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
#define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */

struct  ipstat  ipstat;
struct  ipq     ipq;                    /* ip reass. queue */
u_short ip_id;                          /* ip packet ctr, for ids */
int     ip_defttl;                      /* default IP ttl */

int      in_control __P((struct socket *, u_long, caddr_t, struct ifnet *));
int      ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
void     ip_deq __P((struct ipasfrag *));
int      ip_dooptions __P((struct mbuf *));
void     ip_drain __P((void));
void     ip_enq __P((struct ipasfrag *, struct ipasfrag *));
void     ip_forward __P((struct mbuf *, int));
void     ip_freef __P((struct ipq *));
void     ip_freemoptions __P((struct ip_moptions *));
int      ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **));
void     ip_init __P((void));
int      ip_mforward __P((struct mbuf *, struct ifnet *));
int      ip_optcopy __P((struct ip *, struct ip *));
int      ip_output __P((struct mbuf *,
            struct mbuf *, struct route *, int, struct ip_moptions *));
int      ip_pcbopts __P((struct mbuf **, struct mbuf *));
struct ip *
         ip_reass __P((struct ipasfrag *, struct ipq *));
struct in_ifaddr *
         ip_rtaddr __P((struct in_addr));
int      ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *));
void     ip_slowtimo __P((void));
struct mbuf *
         ip_srcroute __P((void));
void     ip_stripoptions __P((struct mbuf *, struct mbuf *));
int      ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
void     ipintr __P((void));
int      rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
void     rip_init __P((void));
void     rip_input __P((struct mbuf *));
int      rip_output __P((struct mbuf *, struct socket *, u_long));
int      rip_usrreq __P((struct socket *,
            int, struct mbuf *, struct mbuf *, struct mbuf *));
#endif