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Annotation of kernel/bsd/netinet/ip_var.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1982, 1986, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)ip_var.h    8.2 (Berkeley) 1/9/95
        !            59:  */
        !            60: 
        !            61: /*
        !            62:  * Overlay for ip header used by other protocols (tcp, udp).
        !            63:  */
        !            64: struct ipovly {
        !            65:        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
        !            66:        u_char  ih_x1;                  /* (unused) */
        !            67:        u_char  ih_pr;                  /* protocol */
        !            68:        short   ih_len;                 /* protocol length */
        !            69:        struct  in_addr ih_src;         /* source internet address */
        !            70:        struct  in_addr ih_dst;         /* destination internet address */
        !            71: };
        !            72: 
        !            73: /*
        !            74:  * Ip reassembly queue structure.  Each fragment
        !            75:  * being reassembled is attached to one of these structures.
        !            76:  * They are timed out after ipq_ttl drops to 0, and may also
        !            77:  * be reclaimed if memory becomes tight.
        !            78:  */
        !            79: struct ipq {
        !            80:        struct  ipq *next,*prev;        /* to other reass headers */
        !            81:        u_char  ipq_ttl;                /* time for reass q to live */
        !            82:        u_char  ipq_p;                  /* protocol of this fragment */
        !            83:        u_short ipq_id;                 /* sequence id for reassembly */
        !            84:        struct  ipasfrag *ipq_next,*ipq_prev;
        !            85:                                        /* to ip headers of fragments */
        !            86:        struct  in_addr ipq_src,ipq_dst;
        !            87: };
        !            88: 
        !            89: /*
        !            90:  * Ip header, when holding a fragment.
        !            91:  *
        !            92:  * Note: ipf_next must be at same offset as ipq_next above
        !            93:  */
        !            94: struct ipasfrag {
        !            95: #if BYTE_ORDER == LITTLE_ENDIAN
        !            96:        u_char  ip_hl:4,
        !            97:                ip_v:4;
        !            98: #endif
        !            99: #if BYTE_ORDER == BIG_ENDIAN
        !           100:        u_char  ip_v:4,
        !           101:                ip_hl:4;
        !           102: #endif
        !           103:        u_char  ipf_mff;                /* XXX overlays ip_tos: use low bit
        !           104:                                         * to avoid destroying tos;
        !           105:                                         * copied from (ip_off&IP_MF) */
        !           106:        short   ip_len;
        !           107:        u_short ip_id;
        !           108:        short   ip_off;
        !           109:        u_char  ip_ttl;
        !           110:        u_char  ip_p;
        !           111:        u_short ip_sum;
        !           112:        struct  ipasfrag *ipf_next;     /* next fragment */
        !           113:        struct  ipasfrag *ipf_prev;     /* previous fragment */
        !           114: };
        !           115: 
        !           116: /*
        !           117:  * Structure stored in mbuf in inpcb.ip_options
        !           118:  * and passed to ip_output when ip options are in use.
        !           119:  * The actual length of the options (including ipopt_dst)
        !           120:  * is in m_len.
        !           121:  */
        !           122: #define        MAX_IPOPTLEN    40
        !           123: 
        !           124: struct ipoption {
        !           125:        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
        !           126:        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
        !           127: };
        !           128: 
        !           129: /*
        !           130:  * Structure attached to inpcb.ip_moptions and
        !           131:  * passed to ip_output when IP multicast options are in use.
        !           132:  */
        !           133: struct ip_moptions {
        !           134:        struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
        !           135:        u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
        !           136:        u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
        !           137:        u_short imo_num_memberships;    /* no. memberships this socket */
        !           138:        struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
        !           139: };
        !           140: 
        !           141: struct ipstat {
        !           142:        u_long  ips_total;              /* total packets received */
        !           143:        u_long  ips_badsum;             /* checksum bad */
        !           144:        u_long  ips_tooshort;           /* packet too short */
        !           145:        u_long  ips_toosmall;           /* not enough data */
        !           146:        u_long  ips_badhlen;            /* ip header length < data size */
        !           147:        u_long  ips_badlen;             /* ip length < ip header length */
        !           148:        u_long  ips_fragments;          /* fragments received */
        !           149:        u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
        !           150:        u_long  ips_fragtimeout;        /* fragments timed out */
        !           151:        u_long  ips_forward;            /* packets forwarded */
        !           152:        u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
        !           153:        u_long  ips_redirectsent;       /* packets forwarded on same net */
        !           154:        u_long  ips_noproto;            /* unknown or unsupported protocol */
        !           155:        u_long  ips_delivered;          /* datagrams delivered to upper level*/
        !           156:        u_long  ips_localout;           /* total ip packets generated here */
        !           157:        u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
        !           158:        u_long  ips_reassembled;        /* total packets reassembled ok */
        !           159:        u_long  ips_fragmented;         /* datagrams sucessfully fragmented */
        !           160:        u_long  ips_ofragments;         /* output fragments created */
        !           161:        u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
        !           162:        u_long  ips_badoptions;         /* error in option processing */
        !           163:        u_long  ips_noroute;            /* packets discarded due to no route */
        !           164:        u_long  ips_badvers;            /* ip version != 4 */
        !           165:        u_long  ips_rawout;             /* total raw ip packets generated */
        !           166: };
        !           167: 
        !           168: #ifdef _KERNEL
        !           169: /* flags passed to ip_output as last parameter */
        !           170: #define        IP_FORWARDING           0x1             /* most of ip header exists */
        !           171: #define        IP_RAWOUTPUT            0x2             /* raw ip header exists */
        !           172: #define        IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
        !           173: #define        IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
        !           174: 
        !           175: extern struct  ipstat  ipstat;
        !           176: extern struct  ipq     ipq;                    /* ip reass. queue */
        !           177: extern u_short ip_id;                          /* ip packet ctr, for ids */
        !           178: extern int     ip_defttl;                      /* default IP ttl */
        !           179: 
        !           180: int     in_control __P((struct socket *, u_long, caddr_t, struct ifnet *));
        !           181: int     ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
        !           182: void    ip_deq __P((struct ipasfrag *));
        !           183: int     ip_dooptions __P((struct mbuf *));
        !           184: void    ip_drain __P((void));
        !           185: void    ip_enq __P((struct ipasfrag *, struct ipasfrag *));
        !           186: void    ip_forward __P((struct mbuf *, int));
        !           187: void    ip_freef __P((struct ipq *));
        !           188: void    ip_freemoptions __P((struct ip_moptions *));
        !           189: int     ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **));
        !           190: void    ip_init __P((void));
        !           191: int     ip_mforward __P((struct mbuf *, struct ifnet *));
        !           192: int     ip_optcopy __P((struct ip *, struct ip *));
        !           193: int     ip_output __P((struct mbuf *,
        !           194:            struct mbuf *, struct route *, int, struct ip_moptions *));
        !           195: int     ip_pcbopts __P((struct mbuf **, struct mbuf *));
        !           196: struct ip *
        !           197:         ip_reass __P((struct ipasfrag *, struct ipq *));
        !           198: struct in_ifaddr *
        !           199:         ip_rtaddr __P((struct in_addr));
        !           200: int     ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *));
        !           201: void    ip_slowtimo __P((void));
        !           202: struct mbuf *
        !           203:         ip_srcroute __P((void));
        !           204: void    ip_stripoptions __P((struct mbuf *, struct mbuf *));
        !           205: int     ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
        !           206: void    ipintr __P((void));
        !           207: int     rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
        !           208: void    rip_init __P((void));
        !           209: void    rip_input __P((struct mbuf *));
        !           210: int     rip_output __P((struct mbuf *, struct socket *, u_long));
        !           211: int     rip_usrreq __P((struct socket *,
        !           212:            int, struct mbuf *, struct mbuf *, struct mbuf *));
        !           213: #endif

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