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/10.0/sys/netinet/udp_var.h 254925 2013-08-26 18:16:05Z jhb $
   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_v            ui_i.ih_x1[0]
   46 #define ui_pr           ui_i.ih_pr
   47 #define ui_len          ui_i.ih_len
   48 #define ui_src          ui_i.ih_src
   49 #define ui_dst          ui_i.ih_dst
   50 #define ui_sport        ui_u.uh_sport
   51 #define ui_dport        ui_u.uh_dport
   52 #define ui_ulen         ui_u.uh_ulen
   53 #define ui_sum          ui_u.uh_sum
   54 
   55 struct inpcb;
   56 struct mbuf;
   57 
   58 typedef void(*udp_tun_func_t)(struct mbuf *, int off, struct inpcb *);
   59 
   60 /*
   61  * UDP control block; one per udp.
   62  */
   63 struct udpcb {
   64         udp_tun_func_t  u_tun_func;     /* UDP kernel tunneling callback. */
   65         u_int           u_flags;        /* Generic UDP flags. */
   66 };
   67 
   68 #define intoudpcb(ip)   ((struct udpcb *)(ip)->inp_ppcb)
   69 #define sotoudpcb(so)   (intoudpcb(sotoinpcb(so)))
   70 
   71                                 /* IPsec: ESP in UDP tunneling: */
   72 #define UF_ESPINUDP_NON_IKE     0x00000001      /* w/ non-IKE marker .. */
   73         /* .. per draft-ietf-ipsec-nat-t-ike-0[01],
   74          * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
   75 #define UF_ESPINUDP             0x00000002      /* w/ non-ESP marker. */
   76 
   77 struct udpstat {
   78                                 /* input statistics: */
   79         uint64_t udps_ipackets;         /* total input packets */
   80         uint64_t udps_hdrops;           /* packet shorter than header */
   81         uint64_t udps_badsum;           /* checksum error */
   82         uint64_t udps_nosum;            /* no checksum */
   83         uint64_t udps_badlen;           /* data length larger than packet */
   84         uint64_t udps_noport;           /* no socket on port */
   85         uint64_t udps_noportbcast;      /* of above, arrived as broadcast */
   86         uint64_t udps_fullsock;         /* not delivered, input socket full */
   87         uint64_t udpps_pcbcachemiss;    /* input packets missing pcb cache */
   88         uint64_t udpps_pcbhashmiss;     /* input packets not for hashed pcb */
   89                                 /* output statistics: */
   90         uint64_t udps_opackets;         /* total output packets */
   91         uint64_t udps_fastout;          /* output packets on fast path */
   92         /* of no socket on port, arrived as multicast */
   93         uint64_t udps_noportmcast;
   94         uint64_t udps_filtermcast;      /* blocked by multicast filter */
   95 };
   96 
   97 #ifdef _KERNEL
   98 #include <sys/counter.h>
   99 
  100 VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
  101 /*
  102  * In-kernel consumers can use these accessor macros directly to update
  103  * stats.
  104  */
  105 #define UDPSTAT_ADD(name, val)  \
  106     VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val))
  107 #define UDPSTAT_INC(name)       UDPSTAT_ADD(name, 1)
  108 
  109 /*
  110  * Kernel module consumers must use this accessor macro.
  111  */
  112 void    kmod_udpstat_inc(int statnum);
  113 #define KMOD_UDPSTAT_INC(name)  \
  114     kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(uint64_t))
  115 #endif
  116 
  117 /*
  118  * Names for UDP sysctl objects.
  119  */
  120 #define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
  121 #define UDPCTL_STATS            2       /* statistics (read-only) */
  122 #define UDPCTL_MAXDGRAM         3       /* max datagram size */
  123 #define UDPCTL_RECVSPACE        4       /* default receive buffer space */
  124 #define UDPCTL_PCBLIST          5       /* list of PCBs for UDP sockets */
  125 #define UDPCTL_MAXID            6
  126 
  127 #ifdef _KERNEL
  128 SYSCTL_DECL(_net_inet_udp);
  129 
  130 extern struct pr_usrreqs        udp_usrreqs;
  131 VNET_DECLARE(struct inpcbhead, udb);
  132 VNET_DECLARE(struct inpcbinfo, udbinfo);
  133 #define V_udb                   VNET(udb)
  134 #define V_udbinfo               VNET(udbinfo)
  135 
  136 extern u_long                   udp_sendspace;
  137 extern u_long                   udp_recvspace;
  138 VNET_DECLARE(int, udp_cksum);
  139 VNET_DECLARE(int, udp_blackhole);
  140 #define V_udp_cksum             VNET(udp_cksum)
  141 #define V_udp_blackhole         VNET(udp_blackhole)
  142 extern int                      udp_log_in_vain;
  143 
  144 int              udp_newudpcb(struct inpcb *);
  145 void             udp_discardcb(struct udpcb *);
  146 
  147 void             udp_ctlinput(int, struct sockaddr *, void *);
  148 int              udp_ctloutput(struct socket *, struct sockopt *);
  149 void             udp_init(void);
  150 #ifdef VIMAGE
  151 void             udp_destroy(void);
  152 #endif
  153 void             udp_input(struct mbuf *, int);
  154 struct inpcb    *udp_notify(struct inpcb *inp, int errno);
  155 int              udp_shutdown(struct socket *so);
  156 
  157 int udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f);
  158 #endif
  159 
  160 #endif

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