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/11.0/sys/netinet/udp_var.h 301114 2016-06-01 10:14:04Z 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_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, struct inpcb *,
   59                               const struct sockaddr *, void *);
   60 typedef void(*udp_tun_icmp_t)(int, struct sockaddr *, void *, void *);
   61                               
   62 /*
   63  * UDP control block; one per udp.
   64  */
   65 struct udpcb {
   66         udp_tun_func_t  u_tun_func;     /* UDP kernel tunneling callback. */
   67         udp_tun_icmp_t  u_icmp_func;    /* UDP kernel tunneling icmp callback */
   68         u_int           u_flags;        /* Generic UDP flags. */
   69         uint16_t        u_rxcslen;      /* Coverage for incoming datagrams. */
   70         uint16_t        u_txcslen;      /* Coverage for outgoing datagrams. */
   71         void            *u_tun_ctx;     /* Tunneling callback context. */
   72 };
   73 
   74 #define intoudpcb(ip)   ((struct udpcb *)(ip)->inp_ppcb)
   75 #define sotoudpcb(so)   (intoudpcb(sotoinpcb(so)))
   76 
   77                                 /* IPsec: ESP in UDP tunneling: */
   78 #define UF_ESPINUDP_NON_IKE     0x00000001      /* w/ non-IKE marker .. */
   79         /* .. per draft-ietf-ipsec-nat-t-ike-0[01],
   80          * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
   81 #define UF_ESPINUDP             0x00000002      /* w/ non-ESP marker. */
   82 
   83 struct udpstat {
   84                                 /* input statistics: */
   85         uint64_t udps_ipackets;         /* total input packets */
   86         uint64_t udps_hdrops;           /* packet shorter than header */
   87         uint64_t udps_badsum;           /* checksum error */
   88         uint64_t udps_nosum;            /* no checksum */
   89         uint64_t udps_badlen;           /* data length larger than packet */
   90         uint64_t udps_noport;           /* no socket on port */
   91         uint64_t udps_noportbcast;      /* of above, arrived as broadcast */
   92         uint64_t udps_fullsock;         /* not delivered, input socket full */
   93         uint64_t udpps_pcbcachemiss;    /* input packets missing pcb cache */
   94         uint64_t udpps_pcbhashmiss;     /* input packets not for hashed pcb */
   95                                 /* output statistics: */
   96         uint64_t udps_opackets;         /* total output packets */
   97         uint64_t udps_fastout;          /* output packets on fast path */
   98         /* of no socket on port, arrived as multicast */
   99         uint64_t udps_noportmcast;
  100         uint64_t udps_filtermcast;      /* blocked by multicast filter */
  101 };
  102 
  103 #ifdef _KERNEL
  104 #include <sys/counter.h>
  105 
  106 VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
  107 /*
  108  * In-kernel consumers can use these accessor macros directly to update
  109  * stats.
  110  */
  111 #define UDPSTAT_ADD(name, val)  \
  112     VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val))
  113 #define UDPSTAT_INC(name)       UDPSTAT_ADD(name, 1)
  114 
  115 /*
  116  * Kernel module consumers must use this accessor macro.
  117  */
  118 void    kmod_udpstat_inc(int statnum);
  119 #define KMOD_UDPSTAT_INC(name)  \
  120     kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(uint64_t))
  121 #endif
  122 
  123 /*
  124  * Identifiers for UDP sysctl nodes.
  125  */
  126 #define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
  127 #define UDPCTL_STATS            2       /* statistics (read-only) */
  128 #define UDPCTL_MAXDGRAM         3       /* max datagram size */
  129 #define UDPCTL_RECVSPACE        4       /* default receive buffer space */
  130 #define UDPCTL_PCBLIST          5       /* list of PCBs for UDP sockets */
  131 
  132 #ifdef _KERNEL
  133 #include <netinet/in_pcb.h>
  134 SYSCTL_DECL(_net_inet_udp);
  135 
  136 extern struct pr_usrreqs        udp_usrreqs;
  137 VNET_DECLARE(struct inpcbhead, udb);
  138 VNET_DECLARE(struct inpcbinfo, udbinfo);
  139 VNET_DECLARE(struct inpcbhead, ulitecb);
  140 VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
  141 #define V_udb                   VNET(udb)
  142 #define V_udbinfo               VNET(udbinfo)
  143 #define V_ulitecb               VNET(ulitecb)
  144 #define V_ulitecbinfo           VNET(ulitecbinfo)
  145 
  146 extern u_long                   udp_sendspace;
  147 extern u_long                   udp_recvspace;
  148 VNET_DECLARE(int, udp_cksum);
  149 VNET_DECLARE(int, udp_blackhole);
  150 #define V_udp_cksum             VNET(udp_cksum)
  151 #define V_udp_blackhole         VNET(udp_blackhole)
  152 extern int                      udp_log_in_vain;
  153 
  154 static __inline struct inpcbinfo *
  155 udp_get_inpcbinfo(int protocol)
  156 {
  157         return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo;
  158 }
  159 
  160 static __inline struct inpcbhead *
  161 udp_get_pcblist(int protocol)
  162 {
  163         return (protocol == IPPROTO_UDP) ? &V_udb : &V_ulitecb;
  164 }
  165 
  166 int             udp_newudpcb(struct inpcb *);
  167 void            udp_discardcb(struct udpcb *);
  168 
  169 void            udp_ctlinput(int, struct sockaddr *, void *);
  170 void            udplite_ctlinput(int, struct sockaddr *, void *);
  171 int             udp_ctloutput(struct socket *, struct sockopt *);
  172 void            udp_init(void);
  173 void            udplite_init(void);
  174 int             udp_input(struct mbuf **, int *, int);
  175 void            udplite_input(struct mbuf *, int);
  176 struct inpcb    *udp_notify(struct inpcb *inp, int errno);
  177 int             udp_shutdown(struct socket *so);
  178 
  179 int             udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
  180                     udp_tun_icmp_t i, void *ctx);
  181 
  182 #endif /* _KERNEL */
  183 
  184 #endif /* _NETINET_UDP_VAR_H_ */

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