usr/src/sys/netinet/udp_var.h

/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)udp_var.h   8.1 (Berkeley) %G%
 */

/*
 * UDP kernel structures and variables.
 */
struct  udpiphdr {
        struct  ipovly ui_i;            /* overlaid ip structure */
        struct  udphdr ui_u;            /* udp header */
};
#define ui_next         ui_i.ih_next
#define ui_prev         ui_i.ih_prev
#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_long  udps_ipackets;          /* total input packets */
        u_long  udps_hdrops;            /* packet shorter than header */
        u_long  udps_badsum;            /* checksum error */
        u_long  udps_badlen;            /* data length larger than packet */
        u_long  udps_noport;            /* no socket on port */
        u_long  udps_noportbcast;       /* of above, arrived as broadcast */
        u_long  udps_fullsock;          /* not delivered, input socket full */
        u_long  udpps_pcbcachemiss;     /* input packets missing pcb cache */
                                /* output statistics: */
        u_long  udps_opackets;          /* total output packets */
};

/*
 * Names for UDP sysctl objects
 */
#define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
#define UDPCTL_MAXID            2

#define UDPCTL_NAMES { \
        { 0, 0 }, \
        { "checksum", CTLTYPE_INT }, \
}

#ifdef KERNEL
struct  inpcb udb;
struct  udpstat udpstat;

void     udp_ctlinput __P((int, struct sockaddr *, struct ip *));
void     udp_init __P((void));
void     udp_input __P((struct mbuf *, int));
int      udp_output __P((struct inpcb *,
            struct mbuf *, struct mbuf *, struct mbuf *));
int      udp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
int      udp_usrreq __P((struct socket *,
            int, struct mbuf *, struct mbuf *, struct mbuf *));
#endif