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Annotation of XNU/bsd/netinet/ip_dummynet.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1998 Luigi Rizzo
        !            24:  *
        !            25:  * Redistribution and use in source forms, with and without modification,
        !            26:  * are permitted provided that this entire comment appears intact.
        !            27:  *
        !            28:  * Redistribution in binary form may occur without any restrictions.
        !            29:  * Obviously, it would be nice if you gave credit where credit is due
        !            30:  * but requiring it would be too onerous.
        !            31:  *
        !            32:  * This software is provided ``AS IS'' without any warranties of any kind.
        !            33:  *
        !            34:  */
        !            35: 
        !            36: #ifndef _IP_DUMMYNET_H
        !            37: #define _IP_DUMMYNET_H
        !            38: 
        !            39: /*
        !            40:  * Definition of dummynet data structures.
        !            41:  * Dummynet handles a list of pipes, each one identified by a unique
        !            42:  * number (hopefully the list is short so we use a linked list).
        !            43:  *
        !            44:  * Each list contains a set of parameters identifying the pipe, and
        !            45:  * a set of packets queued on the pipe itself.
        !            46:  *
        !            47:  * I could have used queue macros, but the management i have
        !            48:  * is pretty simple and this makes the code more portable.
        !            49:  */
        !            50: 
        !            51: /*
        !            52:  * struct dn_pkt identifies a packet in the dummynet queue. The
        !            53:  * first part is really an m_hdr for implementation purposes, and some
        !            54:  * fields are saved there. When passing the packet back to the ip_input/
        !            55:  * ip_output(), the struct is prepended to the mbuf chain with type
        !            56:  * MT_DUMMYNET, and contains the pointer to the matching rule.
        !            57:  */
        !            58: struct dn_pkt {
        !            59:        struct m_hdr hdr ;
        !            60: #define dn_next        hdr.mh_nextpkt  /* next element in queue */
        !            61: #define dn_m   hdr.mh_next     /* packet to be forwarded */
        !            62: #define dn_hlen        hdr.mh_len      /* hlen, for ip_output                  */
        !            63: #define dn_dir hdr.mh_flags    /* IP_FW_F_IN or IP_FW_F_OUT            */
        !            64:         int     delay;         /* stays queued until delay=0           */
        !            65:         struct ifnet *ifp;     /* interface, for ip_output             */
        !            66:         struct route ro;       /* route, for ip_output. MUST COPY      */
        !            67: 
        !            68: #if   DUMMYNET_DEBUG
        !            69:         struct timeval beg, mid;        /* testing only */
        !            70:         int     act_delay;      /* testing only */
        !            71:         int     in_delay;       /* testing only */
        !            72: #endif
        !            73: };
        !            74: 
        !            75: struct dn_queue {
        !            76:        struct dn_pkt *head, *tail;
        !            77: } ;
        !            78: 
        !            79: /*
        !            80:  * descriptor of a pipe. The flags field will be used to speed up the
        !            81:  * forwarding code paths, in case some of the parameters are not
        !            82:  * used.
        !            83:  */
        !            84: struct dn_pipe {                       /* a pipe */
        !            85:        struct dn_pipe *next ;
        !            86: 
        !            87:        u_short pipe_nr ;               /* number       */
        !            88:        u_short flags ;                 /* to speed up things   */
        !            89: #define DN_HAVE_BW     1
        !            90: #define DN_HAVE_QUEUE  2
        !            91: #define DN_HAVE_DELAY  4
        !            92:        int     bandwidth;              /* really, bytes/tick.  */
        !            93:        int     queue_size ;
        !            94:        int     queue_size_bytes ;
        !            95:        int     delay ;                 /* really, ticks        */
        !            96:        int     plr ;           /* pkt loss rate (2^31-1 means 100%) */
        !            97: 
        !            98:         struct dn_queue r;
        !            99:         int    r_len;                  /* elements in r_queue */
        !           100:         int    r_len_bytes;            /* bytes in r_queue */
        !           101:         int    r_drops;                /* drops from r_queue */
        !           102:         struct dn_queue p ;
        !           103:         int     ticks_from_last_insert;
        !           104:         long    numbytes;              /* which can send or receive */
        !           105: };
        !           106: 
        !           107: /*
        !           108:  * The following is used to define a new mbuf type that is
        !           109:  * prepended to the packet when it comes out of a pipe. The definition
        !           110:  * ought to go in /sys/sys/mbuf.h but here it is less intrusive.
        !           111:  */
        !           112: 
        !           113: #define MT_DUMMYNET MT_CONTROL
        !           114: /*
        !           115:  * what to do of a packet when it comes out of a pipe
        !           116:  */
        !           117: #define DN_TO_IP_OUT   1
        !           118: #define DN_TO_IP_IN    2
        !           119: #define DN_TO_BDG_FWD  3
        !           120: 
        !           121: #if KERNEL
        !           122: 
        !           123: MALLOC_DECLARE(M_IPFW);
        !           124: 
        !           125: typedef int ip_dn_ctl_t __P((struct sockopt *)) ;
        !           126: extern ip_dn_ctl_t *ip_dn_ctl_ptr;
        !           127: 
        !           128: void ip_dn_init(void); /* called in ip_input.c */
        !           129: void dn_rule_delete(void *r);          /* used in ip_fw.c */
        !           130: int dummynet_io(int pipe, int dir,
        !           131:        struct mbuf *m, struct ifnet *ifp, struct route *ro, int hlen,
        !           132:        struct ip_fw_chain *rule);
        !           133: #endif /* KERNEL */
        !           134: 
        !           135: #endif /* _IP_DUMMYNET_H */

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