usr/src/sys/deprecated/bbnnet/ip.h

#define RCSIPHDR "$Header: ip.h,v 1.4 85/07/31 09:31:22 walsh Exp $"


struct ip {                     /* ip leader */
        u_char ip_hl:4,                 /* header length */
#define IP_HLSHIFT 2
                ip_v:4;                 /* version */
        u_char ip_tos;                  /* type of service */
#define ip_mff ip_tos                   /* more fragments flag (input) */
        u_short ip_len;                 /* total length */
        u_short ip_id;                  /* identification */
        u_short ip_off;                 /* fragment offset field */
#define ip_df 0x4000                    /* dont fragment flag */
#define ip_mf 0x2000                    /* more fragments flag (output) */
#define IP_OFFSHIFT 3
        u_char ip_ttl;                  /* time to live */
        u_char ip_p;                    /* protocol */
        u_short ip_sum;                 /* checksum */
#define ip_end ip_sum                   /* fragment end */
        union {
                struct in_addr ip_s;     /* source address */
                struct ip *ip_nxt;      /* ->next fragment */
        } I_sun;
#define ip_src  I_sun.ip_s
#define ip_next I_sun.ip_nxt
        union {
                struct in_addr ip_d;     /* destination address */
                struct ip *ip_prv;      /* ->prev fragment */
        } I_dun;
#define ip_dst  I_dun.ip_d
#define ip_prev I_dun.ip_prv
};

/* ip options */
#define IP_OPT_COPY     0x80            /* option copy type flag */
#define IP_OPT_DEBUG    0x40            /* option debug class (2) */

#define IP_END_OPT      0               /* end of option list */
#define IP_NOP_OPT      1               /* nop option */
#define IP_SEC_OPT      (2+IP_OPT_COPY) /* security option */
#define         IP_SEC_OPTLEN   11              /* length */
#define         IP_SEC_OPTHDR   ((IP_SEC_OPT<<8)|IP_SEC_OPTLEN) /* opt/len */
#define IP_LRTE_OPT     (3+IP_OPT_COPY) /* loose source and record route */
#define IP_TIME_OPT     (4+IP_OPT_DEBUG)/* timestamp */
#define IP_RRTE_OPT     7               /* record route */
#define IP_STRID_OPT    (8+IP_OPT_COPY) /* stream ID */
#define         IP_STRID_OPTLEN 4               /* length */
#define         IP_STRID_OPTHDR ((IP_STRID_OPT<<8)|IP_STRID_OPTLEN) /* opt/len */
#define IP_SRTE_OPT     (9+IP_OPT_COPY) /* strict source and record route */

struct ipq {                    /* ip reass.q header */
        struct ip iqx;                  /* dummy ip element for top of list */
        struct ipq *iq_next;            /* -> next chain on q */
        struct ipq *iq_prev;            /* -> prev chain on q */
        struct ip iqh;                  /* fragment header */
        u_short iq_size         /* maximum fragment size */
};

#define IPVERSION 4             /* internet protocol version number */
#define IPMAX 576               /* maximum spec ip packet length */
#define MAXTTL 10               /* maximum time to live (seconds) */

/*
 * ip statistics structure
 */

struct ip_stat {
    struct in_stat ip_in;
#define ip_total        ip_in.in_total
#define ip_badsum       ip_in.in_badsum
#define ip_tooshort     ip_in.in_tooshort
#define ip_drops        ip_in.in_drops
        int ip_forwarded;       /* #ip packets not addressed to us */
        int ip_broadcast;       /* #broadcast packets received */
};


#ifdef KERNEL

extern struct ip_stat ipstat;
extern struct in_stat otherstat;

/*
 * Enqueue a fragment on the reassembly chain.
 * Can't use insque/remque since prev/next not at head of structure.
 */
#define ip_enq(p, prev)                                                 \
{       register struct ip *PREV = prev;                                \
                                                                        \
        p->ip_prev = PREV;                                              \
        p->ip_next = PREV->ip_next;                                     \
        PREV->ip_next->ip_prev = p;                                     \
        PREV->ip_next = p;                                              \
}

/* Dequeue a fragment from reassembly chain.  */
#define ip_deq(p)                                                       \
{                                                                       \
        p->ip_prev->ip_next = p->ip_next;                               \
        p->ip_next->ip_prev = p->ip_prev;                               \
}
#endif