The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1993
    3  *      The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
   31  * $FreeBSD: releng/8.1/sys/netinet/udp_var.h 207695 2010-05-06 06:44:19Z bz $
   32  */
   33 
   34 #ifndef _NETINET_UDP_VAR_H_
   35 #define _NETINET_UDP_VAR_H_
   36 
   37 /*
   38  * UDP kernel structures and variables.
   39  */
   40 struct udpiphdr {
   41         struct ipovly   ui_i;           /* overlaid ip structure */
   42         struct udphdr   ui_u;           /* udp header */
   43 };
   44 #define ui_x1           ui_i.ih_x1
   45 #define ui_pr           ui_i.ih_pr
   46 #define ui_len          ui_i.ih_len
   47 #define ui_src          ui_i.ih_src
   48 #define ui_dst          ui_i.ih_dst
   49 #define ui_sport        ui_u.uh_sport
   50 #define ui_dport        ui_u.uh_dport
   51 #define ui_ulen         ui_u.uh_ulen
   52 #define ui_sum          ui_u.uh_sum
   53 
   54 typedef void(*udp_tun_func_t)(struct mbuf *, int off, struct inpcb *);
   55 
   56 /*
   57  * UDP control block; one per udp.
   58  */
   59 struct udpcb {
   60         udp_tun_func_t  u_tun_func;     /* UDP kernel tunneling callback. */
   61         u_int           u_flags;        /* Generic UDP flags. */
   62 };
   63 
   64 #define intoudpcb(ip)   ((struct udpcb *)(ip)->inp_ppcb)
   65 #define sotoudpcb(so)   (intoudpcb(sotoinpcb(so)))
   66 
   67                                 /* IPsec: ESP in UDP tunneling: */
   68 #define UF_ESPINUDP_NON_IKE     0x00000001      /* w/ non-IKE marker .. */
   69         /* .. per draft-ietf-ipsec-nat-t-ike-0[01],
   70          * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
   71 #define UF_ESPINUDP             0x00000002      /* w/ non-ESP marker. */
   72 
   73 struct udpstat {
   74                                 /* input statistics: */
   75         u_long  udps_ipackets;          /* total input packets */
   76         u_long  udps_hdrops;            /* packet shorter than header */
   77         u_long  udps_badsum;            /* checksum error */
   78         u_long  udps_nosum;             /* no checksum */
   79         u_long  udps_badlen;            /* data length larger than packet */
   80         u_long  udps_noport;            /* no socket on port */
   81         u_long  udps_noportbcast;       /* of above, arrived as broadcast */
   82         u_long  udps_fullsock;          /* not delivered, input socket full */
   83         u_long  udpps_pcbcachemiss;     /* input packets missing pcb cache */
   84         u_long  udpps_pcbhashmiss;      /* input packets not for hashed pcb */
   85                                 /* output statistics: */
   86         u_long  udps_opackets;          /* total output packets */
   87         u_long  udps_fastout;           /* output packets on fast path */
   88         /* of no socket on port, arrived as multicast */
   89         u_long  udps_noportmcast;
   90         u_long  udps_filtermcast;       /* blocked by multicast filter */
   91 };
   92 
   93 #ifdef _KERNEL
   94 /*
   95  * In-kernel consumers can use these accessor macros directly to update
   96  * stats.
   97  */
   98 #define UDPSTAT_ADD(name, val)  V_udpstat.name += (val)
   99 #define UDPSTAT_INC(name)       UDPSTAT_ADD(name, 1)
  100 
  101 /*
  102  * Kernel module consumers must use this accessor macro.
  103  */
  104 void    kmod_udpstat_inc(int statnum);
  105 #define KMOD_UDPSTAT_INC(name)                                          \
  106         kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(u_long))
  107 #endif
  108 
  109 /*
  110  * Names for UDP sysctl objects.
  111  */
  112 #define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
  113 #define UDPCTL_STATS            2       /* statistics (read-only) */
  114 #define UDPCTL_MAXDGRAM         3       /* max datagram size */
  115 #define UDPCTL_RECVSPACE        4       /* default receive buffer space */
  116 #define UDPCTL_PCBLIST          5       /* list of PCBs for UDP sockets */
  117 #define UDPCTL_MAXID            6
  118 
  119 #define UDPCTL_NAMES    {                                               \
  120         { 0, 0 },                                                       \
  121         { "checksum", CTLTYPE_INT },                                    \
  122         { "stats", CTLTYPE_STRUCT },                                    \
  123         { "maxdgram", CTLTYPE_INT },                                    \
  124         { "recvspace", CTLTYPE_INT },                                   \
  125         { "pcblist", CTLTYPE_STRUCT },                                  \
  126 }
  127 
  128 #ifdef _KERNEL
  129 SYSCTL_DECL(_net_inet_udp);
  130 
  131 extern struct pr_usrreqs        udp_usrreqs;
  132 VNET_DECLARE(struct inpcbhead, udb);
  133 VNET_DECLARE(struct inpcbinfo, udbinfo);
  134 #define V_udb                   VNET(udb)
  135 #define V_udbinfo               VNET(udbinfo)
  136 
  137 extern u_long                   udp_sendspace;
  138 extern u_long                   udp_recvspace;
  139 VNET_DECLARE(struct udpstat, udpstat);
  140 VNET_DECLARE(int, udp_blackhole);
  141 #define V_udpstat               VNET(udpstat)
  142 #define V_udp_blackhole         VNET(udp_blackhole)
  143 extern int                      udp_log_in_vain;
  144 
  145 int              udp_newudpcb(struct inpcb *);
  146 void             udp_discardcb(struct udpcb *);
  147 
  148 void             udp_ctlinput(int, struct sockaddr *, void *);
  149 int              udp_ctloutput(struct socket *, struct sockopt *);
  150 void             udp_init(void);
  151 #ifdef VIMAGE
  152 void             udp_destroy(void);
  153 #endif
  154 void             udp_input(struct mbuf *, int);
  155 struct inpcb    *udp_notify(struct inpcb *inp, int errno);
  156 int              udp_shutdown(struct socket *so);
  157 
  158 int udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f);
  159 #endif
  160 
  161 #endif

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