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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * 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
     * $FreeBSD$
     */
    
    #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 */
    };
    #define ui_x1           ui_i.ih_x1
    #define ui_v            ui_i.ih_x1[0]
    #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 inpcb;
    struct mbuf;
    
    typedef void(*udp_tun_func_t)(struct mbuf *, int, struct inpcb *,
                                  const struct sockaddr *, void *);
    typedef void(*udp_tun_icmp_t)(int, struct sockaddr *, void *, void *);
                                  
    /*
     * UDP control block; one per udp.
     */
    struct udpcb {
            udp_tun_func_t  u_tun_func;     /* UDP kernel tunneling callback. */
            udp_tun_icmp_t  u_icmp_func;    /* UDP kernel tunneling icmp callback */
            u_int           u_flags;        /* Generic UDP flags. */
            uint16_t        u_rxcslen;      /* Coverage for incoming datagrams. */
            uint16_t        u_txcslen;      /* Coverage for outgoing datagrams. */
            void            *u_tun_ctx;     /* Tunneling callback context. */
    };
    
    #define intoudpcb(ip)   ((struct udpcb *)(ip)->inp_ppcb)
    #define sotoudpcb(so)   (intoudpcb(sotoinpcb(so)))
    
                                    /* IPsec: ESP in UDP tunneling: */
    #define UF_ESPINUDP_NON_IKE     0x00000001      /* w/ non-IKE marker .. */
            /* .. per draft-ietf-ipsec-nat-t-ike-0[01],
             * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
    #define UF_ESPINUDP             0x00000002      /* w/ non-ESP marker. */
    
    struct udpstat {
                                    /* input statistics: */
            uint64_t udps_ipackets;         /* total input packets */
            uint64_t udps_hdrops;           /* packet shorter than header */
            uint64_t udps_badsum;           /* checksum error */
            uint64_t udps_nosum;            /* no checksum */
            uint64_t udps_badlen;           /* data length larger than packet */
            uint64_t udps_noport;           /* no socket on port */
            uint64_t udps_noportbcast;      /* of above, arrived as broadcast */
            uint64_t udps_fullsock;         /* not delivered, input socket full */
            uint64_t udpps_pcbcachemiss;    /* input packets missing pcb cache */
            uint64_t udpps_pcbhashmiss;     /* input packets not for hashed pcb */
                                    /* output statistics: */
            uint64_t udps_opackets;         /* total output packets */
            uint64_t udps_fastout;          /* output packets on fast path */
           /* of no socket on port, arrived as multicast */
           uint64_t udps_noportmcast;
           uint64_t udps_filtermcast;      /* blocked by multicast filter */
   };
   
   #ifdef _KERNEL
   #include <sys/counter.h>
   
   VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
   /*
    * In-kernel consumers can use these accessor macros directly to update
    * stats.
    */
   #define UDPSTAT_ADD(name, val)  \
       VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val))
   #define UDPSTAT_INC(name)       UDPSTAT_ADD(name, 1)
   
   /*
    * Kernel module consumers must use this accessor macro.
    */
   void    kmod_udpstat_inc(int statnum);
   #define KMOD_UDPSTAT_INC(name)  \
       kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(uint64_t))
   #endif
   
   /*
    * Identifiers for UDP sysctl nodes.
    */
   #define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
   #define UDPCTL_STATS            2       /* statistics (read-only) */
   #define UDPCTL_MAXDGRAM         3       /* max datagram size */
   #define UDPCTL_RECVSPACE        4       /* default receive buffer space */
   #define UDPCTL_PCBLIST          5       /* list of PCBs for UDP sockets */
   
   #ifdef _KERNEL
   #include <netinet/in_pcb.h>
   SYSCTL_DECL(_net_inet_udp);
   
   extern struct pr_usrreqs        udp_usrreqs;
   VNET_DECLARE(struct inpcbhead, udb);
   VNET_DECLARE(struct inpcbinfo, udbinfo);
   VNET_DECLARE(struct inpcbhead, ulitecb);
   VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
   #define V_udb                   VNET(udb)
   #define V_udbinfo               VNET(udbinfo)
   #define V_ulitecb               VNET(ulitecb)
   #define V_ulitecbinfo           VNET(ulitecbinfo)
   
   extern u_long                   udp_sendspace;
   extern u_long                   udp_recvspace;
   VNET_DECLARE(int, udp_cksum);
   VNET_DECLARE(int, udp_blackhole);
   VNET_DECLARE(int, udp_log_in_vain);
   #define V_udp_cksum             VNET(udp_cksum)
   #define V_udp_blackhole         VNET(udp_blackhole)
   #define V_udp_log_in_vain       VNET(udp_log_in_vain)
   
   static __inline struct inpcbinfo *
   udp_get_inpcbinfo(int protocol)
   {
           return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo;
   }
   
   static __inline struct inpcbhead *
   udp_get_pcblist(int protocol)
   {
           return (protocol == IPPROTO_UDP) ? &V_udb : &V_ulitecb;
   }
   
   int             udp_newudpcb(struct inpcb *);
   void            udp_discardcb(struct udpcb *);
   
   void            udp_ctlinput(int, struct sockaddr *, void *);
   void            udplite_ctlinput(int, struct sockaddr *, void *);
   int             udp_ctloutput(struct socket *, struct sockopt *);
   void            udp_init(void);
   void            udplite_init(void);
   int             udp_input(struct mbuf **, int *, int);
   void            udplite_input(struct mbuf *, int);
   struct inpcb    *udp_notify(struct inpcb *inp, int errno);
   int             udp_shutdown(struct socket *so);
   
   int             udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
                       udp_tun_icmp_t i, void *ctx);
   
   #endif /* _KERNEL */
   
   #endif /* _NETINET_UDP_VAR_H_ */

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