FreeBSD/Linux Kernel Cross Reference
sys/netinet/udp_var.h

     /*      $NetBSD: udp_var.h,v 1.27 2005/02/12 12:31:08 manu Exp $        */
     
     /*
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
     */
    
    #ifndef _NETINET_UDP_VAR_H_
    #define _NETINET_UDP_VAR_H_
    
    /*
     * UDP kernel structures and variables.
     */
    struct  udpiphdr {
            struct  ipovly ui_i;            /* overlaid ip structure */
            struct  udphdr ui_u;            /* udp header */
    } __attribute__((__packed__));
    #define ui_x1           ui_i.ih_x1
    #define ui_pr           ui_i.ih_pr
    #define ui_len          ui_i.ih_len
    #define ui_src          ui_i.ih_src
    #define ui_dst          ui_i.ih_dst
    #define ui_sport        ui_u.uh_sport
    #define ui_dport        ui_u.uh_dport
    #define ui_ulen         ui_u.uh_ulen
    #define ui_sum          ui_u.uh_sum
    
    struct  udpstat {
                                            /* input statistics: */
            u_quad_t udps_ipackets;         /* total input packets */
            u_quad_t udps_hdrops;           /* packet shorter than header */
            u_quad_t udps_badsum;           /* checksum error */
            u_quad_t udps_badlen;           /* data length larger than packet */
            u_quad_t udps_noport;           /* no socket on port */
            u_quad_t udps_noportbcast;      /* of above, arrived as broadcast */
            u_quad_t udps_fullsock;         /* not delivered, input socket full */
            u_quad_t udps_pcbhashmiss;      /* input packets missing pcb hash */
                                            /* output statistics: */
            u_quad_t udps_opackets;         /* total output packets */
    };
    
    /*
     * Names for UDP sysctl objects
     */
    #define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
    #define UDPCTL_SENDSPACE        2       /* default send buffer */
    #define UDPCTL_RECVSPACE        3       /* default recv buffer */
    #define UDPCTL_LOOPBACKCKSUM    4       /* do UDP checksum on loopback */
    #define UDPCTL_MAXID            5
    
    #define UDPCTL_NAMES { \
            { 0, 0 }, \
            { "checksum", CTLTYPE_INT }, \
            { "sendspace", CTLTYPE_INT }, \
            { "recvspace", CTLTYPE_INT }, \
            { "do_loopback_cksum", CTLTYPE_INT }, \
    }
    
    #ifdef _KERNEL
    extern  struct  inpcbtable udbtable;
    extern  struct  udpstat udpstat;
    extern  int     udp_do_loopback_cksum;
    
    #ifdef __NO_STRICT_ALIGNMENT
    #define UDP_HDR_ALIGNED_P(uh)   1
    #else
    #define UDP_HDR_ALIGNED_P(uh)   ((((vaddr_t) (uh)) & 3) == 0)
    #endif
    
    void     *udp_ctlinput(int, struct sockaddr *, void *);
    int      udp_ctloutput(int, struct socket *, int, int, struct mbuf **);
    void     udp_init(void);
    void     udp_input(struct mbuf *, ...);
   int      udp_output(struct mbuf *, ...);
   int      udp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
   int      udp_usrreq(struct socket *,
               int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
   
   int      udp_input_checksum(int af, struct mbuf *, const struct udphdr *, int,
               int);
   #endif
   
   #endif /* _NETINET_UDP_VAR_H_ */

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