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Annotation of 43BSDTahoe/sys/netinet/ip_var.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  *
                     17:  *     @(#)ip_var.h    7.5 (Berkeley) 6/29/88
                     18:  */
                     19: 
                     20: /*
                     21:  * Overlay for ip header used by other protocols (tcp, udp).
                     22:  */
                     23: struct ipovly {
                     24:        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
                     25:        u_char  ih_x1;                  /* (unused) */
                     26:        u_char  ih_pr;                  /* protocol */
                     27:        short   ih_len;                 /* protocol length */
                     28:        struct  in_addr ih_src;         /* source internet address */
                     29:        struct  in_addr ih_dst;         /* destination internet address */
                     30: };
                     31: 
                     32: /*
                     33:  * Ip reassembly queue structure.  Each fragment
                     34:  * being reassembled is attached to one of these structures.
                     35:  * They are timed out after ipq_ttl drops to 0, and may also
                     36:  * be reclaimed if memory becomes tight.
                     37:  */
                     38: struct ipq {
                     39:        struct  ipq *next,*prev;        /* to other reass headers */
                     40:        u_char  ipq_ttl;                /* time for reass q to live */
                     41:        u_char  ipq_p;                  /* protocol of this fragment */
                     42:        u_short ipq_id;                 /* sequence id for reassembly */
                     43:        struct  ipasfrag *ipq_next,*ipq_prev;
                     44:                                        /* to ip headers of fragments */
                     45:        struct  in_addr ipq_src,ipq_dst;
                     46: };
                     47: 
                     48: /*
                     49:  * Ip header, when holding a fragment.
                     50:  *
                     51:  * Note: ipf_next must be at same offset as ipq_next above
                     52:  */
                     53: struct ipasfrag {
                     54: #if BYTE_ORDER == LITTLE_ENDIAN 
                     55:        u_char  ip_hl:4,
                     56:                ip_v:4;
                     57: #endif
                     58: #if BYTE_ORDER == BIG_ENDIAN 
                     59:        u_char  ip_v:4,
                     60:                ip_hl:4;
                     61: #endif
                     62:        u_char  ipf_mff;                /* copied from (ip_off&IP_MF) */
                     63:        short   ip_len;
                     64:        u_short ip_id;
                     65:        short   ip_off;
                     66:        u_char  ip_ttl;
                     67:        u_char  ip_p;
                     68:        u_short ip_sum;
                     69:        struct  ipasfrag *ipf_next;     /* next fragment */
                     70:        struct  ipasfrag *ipf_prev;     /* previous fragment */
                     71: };
                     72: 
                     73: /*
                     74:  * Structure stored in mbuf in inpcb.ip_options
                     75:  * and passed to ip_output when ip options are in use.
                     76:  * The actual length of the options (including ipopt_dst)
                     77:  * is in m_len.
                     78:  */
                     79: #define MAX_IPOPTLEN   40
                     80: 
                     81: struct ipoption {
                     82:        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
                     83:        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
                     84: };
                     85: 
                     86: struct ipstat {
                     87:        long    ips_total;              /* total packets received */
                     88:        long    ips_badsum;             /* checksum bad */
                     89:        long    ips_tooshort;           /* packet too short */
                     90:        long    ips_toosmall;           /* not enough data */
                     91:        long    ips_badhlen;            /* ip header length < data size */
                     92:        long    ips_badlen;             /* ip length < ip header length */
                     93:        long    ips_fragments;          /* fragments received */
                     94:        long    ips_fragdropped;        /* frags dropped (dups, out of space) */
                     95:        long    ips_fragtimeout;        /* fragments timed out */
                     96:        long    ips_forward;            /* packets forwarded */
                     97:        long    ips_cantforward;        /* packets rcvd for unreachable dest */
                     98:        long    ips_redirectsent;       /* packets forwarded on same net */
                     99: };
                    100: 
                    101: #ifdef KERNEL
                    102: /* flags passed to ip_output as last parameter */
                    103: #define        IP_FORWARDING           0x1             /* most of ip header exists */
                    104: #define        IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
                    105: #define        IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
                    106: 
                    107: struct ipstat  ipstat;
                    108: struct ipq     ipq;                    /* ip reass. queue */
                    109: u_short        ip_id;                          /* ip packet ctr, for ids */
                    110: 
                    111: struct mbuf *ip_srcroute();
                    112: #endif

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