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Annotation of qemu/slirp/ip.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1993
        !             3:  *     The Regents of the University of California.  All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)ip.h        8.1 (Berkeley) 6/10/93
        !            34:  * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
        !            35:  */
        !            36: 
        !            37: #ifndef _IP_H_
        !            38: #define _IP_H_
        !            39: 
        !            40: #ifdef WORDS_BIGENDIAN
        !            41: # ifndef NTOHL
        !            42: #  define NTOHL(d)
        !            43: # endif
        !            44: # ifndef NTOHS
        !            45: #  define NTOHS(d)
        !            46: # endif
        !            47: # ifndef HTONL
        !            48: #  define HTONL(d)
        !            49: # endif
        !            50: # ifndef HTONS
        !            51: #  define HTONS(d)
        !            52: # endif
        !            53: #else
        !            54: # ifndef NTOHL
        !            55: #  define NTOHL(d) ((d) = ntohl((d)))
        !            56: # endif
        !            57: # ifndef NTOHS
        !            58: #  define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
        !            59: # endif
        !            60: # ifndef HTONL
        !            61: #  define HTONL(d) ((d) = htonl((d)))
        !            62: # endif
        !            63: # ifndef HTONS
        !            64: #  define HTONS(d) ((d) = htons((u_int16_t)(d)))
        !            65: # endif
        !            66: #endif
        !            67: 
        !            68: typedef u_int32_t n_long;                 /* long as received from the net */
        !            69: 
        !            70: /*
        !            71:  * Definitions for internet protocol version 4.
        !            72:  * Per RFC 791, September 1981.
        !            73:  */
        !            74: #define        IPVERSION       4
        !            75: 
        !            76: /*
        !            77:  * Structure of an internet header, naked of options.
        !            78:  *
        !            79:  * We declare ip_len and ip_off to be short, rather than u_short
        !            80:  * pragmatically since otherwise unsigned comparisons can result
        !            81:  * against negative integers quite easily, and fail in subtle ways.
        !            82:  */
        !            83: struct ip {
        !            84: #ifdef WORDS_BIGENDIAN
        !            85:        u_int ip_v:4,                   /* version */
        !            86:                ip_hl:4;                /* header length */
        !            87: #else
        !            88:        u_int ip_hl:4,          /* header length */
        !            89:                ip_v:4;                 /* version */
        !            90: #endif
        !            91:        u_int8_t ip_tos;                        /* type of service */
        !            92:        int16_t ip_len;                 /* total length */
        !            93:        u_int16_t       ip_id;                  /* identification */
        !            94:        int16_t ip_off;                 /* fragment offset field */
        !            95: #define        IP_DF 0x4000                    /* don't fragment flag */
        !            96: #define        IP_MF 0x2000                    /* more fragments flag */
        !            97: #define        IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
        !            98:        u_int8_t ip_ttl;                        /* time to live */
        !            99:        u_int8_t ip_p;                  /* protocol */
        !           100:        u_int16_t       ip_sum;                 /* checksum */
        !           101:        struct  in_addr ip_src,ip_dst;  /* source and dest address */
        !           102: };
        !           103: 
        !           104: #define        IP_MAXPACKET    65535           /* maximum packet size */
        !           105: 
        !           106: /*
        !           107:  * Definitions for IP type of service (ip_tos)
        !           108:  */
        !           109: #define        IPTOS_LOWDELAY          0x10
        !           110: #define        IPTOS_THROUGHPUT        0x08
        !           111: #define        IPTOS_RELIABILITY       0x04
        !           112: 
        !           113: /*
        !           114:  * Definitions for options.
        !           115:  */
        !           116: #define        IPOPT_COPIED(o)         ((o)&0x80)
        !           117: #define        IPOPT_CLASS(o)          ((o)&0x60)
        !           118: #define        IPOPT_NUMBER(o)         ((o)&0x1f)
        !           119: 
        !           120: #define        IPOPT_CONTROL           0x00
        !           121: #define        IPOPT_RESERVED1         0x20
        !           122: #define        IPOPT_DEBMEAS           0x40
        !           123: #define        IPOPT_RESERVED2         0x60
        !           124: 
        !           125: #define        IPOPT_EOL               0               /* end of option list */
        !           126: #define        IPOPT_NOP               1               /* no operation */
        !           127: 
        !           128: #define        IPOPT_RR                7               /* record packet route */
        !           129: #define        IPOPT_TS                68              /* timestamp */
        !           130: #define        IPOPT_SECURITY          130             /* provide s,c,h,tcc */
        !           131: #define        IPOPT_LSRR              131             /* loose source route */
        !           132: #define        IPOPT_SATID             136             /* satnet id */
        !           133: #define        IPOPT_SSRR              137             /* strict source route */
        !           134: 
        !           135: /*
        !           136:  * Offsets to fields in options other than EOL and NOP.
        !           137:  */
        !           138: #define        IPOPT_OPTVAL            0               /* option ID */
        !           139: #define        IPOPT_OLEN              1               /* option length */
        !           140: #define IPOPT_OFFSET           2               /* offset within option */
        !           141: #define        IPOPT_MINOFF            4               /* min value of above */
        !           142: 
        !           143: /*
        !           144:  * Time stamp option structure.
        !           145:  */
        !           146: struct ip_timestamp {
        !           147:        u_int8_t        ipt_code;               /* IPOPT_TS */
        !           148:        u_int8_t        ipt_len;                /* size of structure (variable) */
        !           149:        u_int8_t        ipt_ptr;                /* index of current entry */
        !           150: #ifdef WORDS_BIGENDIAN
        !           151:        u_int   ipt_oflw:4,             /* overflow counter */
        !           152:                ipt_flg:4;              /* flags, see below */
        !           153: #else
        !           154:        u_int   ipt_flg:4,              /* flags, see below */
        !           155:                ipt_oflw:4;             /* overflow counter */
        !           156: #endif
        !           157:        union ipt_timestamp {
        !           158:                n_long  ipt_time[1];
        !           159:                struct  ipt_ta {
        !           160:                        struct in_addr ipt_addr;
        !           161:                        n_long ipt_time;
        !           162:                } ipt_ta[1];
        !           163:        } ipt_timestamp;
        !           164: };
        !           165: 
        !           166: /* flag bits for ipt_flg */
        !           167: #define        IPOPT_TS_TSONLY         0               /* timestamps only */
        !           168: #define        IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
        !           169: #define        IPOPT_TS_PRESPEC        3               /* specified modules only */
        !           170: 
        !           171: /* bits for security (not byte swapped) */
        !           172: #define        IPOPT_SECUR_UNCLASS     0x0000
        !           173: #define        IPOPT_SECUR_CONFID      0xf135
        !           174: #define        IPOPT_SECUR_EFTO        0x789a
        !           175: #define        IPOPT_SECUR_MMMM        0xbc4d
        !           176: #define        IPOPT_SECUR_RESTR       0xaf13
        !           177: #define        IPOPT_SECUR_SECRET      0xd788
        !           178: #define        IPOPT_SECUR_TOPSECRET   0x6bc5
        !           179: 
        !           180: /*
        !           181:  * Internet implementation parameters.
        !           182:  */
        !           183: #define        MAXTTL          255             /* maximum time to live (seconds) */
        !           184: #define        IPDEFTTL        64              /* default ttl, from RFC 1340 */
        !           185: #define        IPFRAGTTL       60              /* time to live for frags, slowhz */
        !           186: #define        IPTTLDEC        1               /* subtracted when forwarding */
        !           187: 
        !           188: #define        IP_MSS          576             /* default maximum segment size */
        !           189: 
        !           190: #ifdef HAVE_SYS_TYPES32_H  /* Overcome some Solaris 2.x junk */
        !           191: #include <sys/types32.h>
        !           192: #else
        !           193: #if SIZEOF_CHAR_P == 4
        !           194: typedef caddr_t caddr32_t;
        !           195: #else
        !           196: typedef u_int32_t caddr32_t;
        !           197: #endif
        !           198: #endif
        !           199: 
        !           200: #if SIZEOF_CHAR_P == 4
        !           201: typedef struct ipq *ipqp_32;
        !           202: typedef struct ipasfrag *ipasfragp_32;
        !           203: #else
        !           204: typedef caddr32_t ipqp_32;
        !           205: typedef caddr32_t ipasfragp_32;
        !           206: #endif
        !           207: 
        !           208: /*
        !           209:  * Overlay for ip header used by other protocols (tcp, udp).
        !           210:  */
        !           211: struct ipovly {
        !           212:        caddr32_t       ih_next, ih_prev;       /* for protocol sequence q's */
        !           213:        u_int8_t        ih_x1;                  /* (unused) */
        !           214:        u_int8_t        ih_pr;                  /* protocol */
        !           215:        int16_t ih_len;                 /* protocol length */
        !           216:        struct  in_addr ih_src;         /* source internet address */
        !           217:        struct  in_addr ih_dst;         /* destination internet address */
        !           218: };
        !           219: 
        !           220: /*
        !           221:  * Ip reassembly queue structure.  Each fragment
        !           222:  * being reassembled is attached to one of these structures.
        !           223:  * They are timed out after ipq_ttl drops to 0, and may also
        !           224:  * be reclaimed if memory becomes tight.
        !           225:  * size 28 bytes
        !           226:  */
        !           227: struct ipq {
        !           228:        ipqp_32 next,prev;      /* to other reass headers */
        !           229:        u_int8_t        ipq_ttl;                /* time for reass q to live */
        !           230:        u_int8_t        ipq_p;                  /* protocol of this fragment */
        !           231:        u_int16_t       ipq_id;                 /* sequence id for reassembly */
        !           232:        ipasfragp_32 ipq_next,ipq_prev;
        !           233:                                        /* to ip headers of fragments */
        !           234:        struct  in_addr ipq_src,ipq_dst;
        !           235: };
        !           236: 
        !           237: /*
        !           238:  * Ip header, when holding a fragment.
        !           239:  *
        !           240:  * Note: ipf_next must be at same offset as ipq_next above
        !           241:  */
        !           242: struct ipasfrag {
        !           243: #ifdef WORDS_BIGENDIAN
        !           244:        u_int   ip_v:4,
        !           245:                ip_hl:4;
        !           246: #else
        !           247:        u_int   ip_hl:4,
        !           248:                ip_v:4;
        !           249: #endif
        !           250:                                         /* BUG : u_int changed to u_int8_t.
        !           251:                                          * sizeof(u_int)==4 on linux 2.0
        !           252:                                         */
        !           253:         u_int8_t ipf_mff;              /* XXX overlays ip_tos: use low bit
        !           254:                                         * to avoid destroying tos (PPPDTRuu);
        !           255:                                         * copied from (ip_off&IP_MF) */
        !           256:        int16_t ip_len;
        !           257:        u_int16_t       ip_id;
        !           258:        int16_t ip_off;
        !           259:        u_int8_t        ip_ttl;
        !           260:        u_int8_t        ip_p;
        !           261:        u_int16_t       ip_sum;
        !           262:        ipasfragp_32 ipf_next;          /* next fragment */
        !           263:        ipasfragp_32 ipf_prev;          /* previous fragment */
        !           264: };
        !           265: 
        !           266: /*
        !           267:  * Structure stored in mbuf in inpcb.ip_options
        !           268:  * and passed to ip_output when ip options are in use.
        !           269:  * The actual length of the options (including ipopt_dst)
        !           270:  * is in m_len.
        !           271:  */
        !           272: #define MAX_IPOPTLEN   40
        !           273: 
        !           274: struct ipoption {
        !           275:        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
        !           276:        int8_t  ipopt_list[MAX_IPOPTLEN];       /* options proper */
        !           277: };
        !           278: 
        !           279: /*
        !           280:  * Structure attached to inpcb.ip_moptions and
        !           281:  * passed to ip_output when IP multicast options are in use.
        !           282:  */
        !           283: 
        !           284: struct ipstat {
        !           285:        u_long  ips_total;              /* total packets received */
        !           286:        u_long  ips_badsum;             /* checksum bad */
        !           287:        u_long  ips_tooshort;           /* packet too short */
        !           288:        u_long  ips_toosmall;           /* not enough data */
        !           289:        u_long  ips_badhlen;            /* ip header length < data size */
        !           290:        u_long  ips_badlen;             /* ip length < ip header length */
        !           291:        u_long  ips_fragments;          /* fragments received */
        !           292:        u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
        !           293:        u_long  ips_fragtimeout;        /* fragments timed out */
        !           294:        u_long  ips_forward;            /* packets forwarded */
        !           295:        u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
        !           296:        u_long  ips_redirectsent;       /* packets forwarded on same net */
        !           297:        u_long  ips_noproto;            /* unknown or unsupported protocol */
        !           298:        u_long  ips_delivered;          /* datagrams delivered to upper level*/
        !           299:        u_long  ips_localout;           /* total ip packets generated here */
        !           300:        u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
        !           301:        u_long  ips_reassembled;        /* total packets reassembled ok */
        !           302:        u_long  ips_fragmented;         /* datagrams successfully fragmented */
        !           303:        u_long  ips_ofragments;         /* output fragments created */
        !           304:        u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
        !           305:        u_long  ips_badoptions;         /* error in option processing */
        !           306:        u_long  ips_noroute;            /* packets discarded due to no route */
        !           307:        u_long  ips_badvers;            /* ip version != 4 */
        !           308:        u_long  ips_rawout;             /* total raw ip packets generated */
        !           309:        u_long  ips_unaligned;          /* times the ip packet was not aligned */
        !           310: };
        !           311: 
        !           312: extern struct  ipstat  ipstat;
        !           313: extern struct  ipq     ipq;                    /* ip reass. queue */
        !           314: extern u_int16_t       ip_id;                          /* ip packet ctr, for ids */
        !           315: extern int     ip_defttl;                      /* default IP ttl */
        !           316: 
        !           317: #endif

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