FreeBSD/Linux Kernel Cross Reference
sys/netinet/accf_data.c

     /*      $NetBSD: accf_data.c,v 1.2 2008/10/14 13:05:44 ad Exp $ */
     
     /*-
      * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: accf_data.c,v 1.2 2008/10/14 13:05:44 ad Exp $");
    
    #define ACCEPT_FILTER_MOD
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/lkm.h>
    #include <sys/sysctl.h>
    #include <sys/signalvar.h>
    #include <sys/socketvar.h>
    
    #include <netinet/accept_filter.h>
    
    /* accept filter that holds a socket until data arrives */
    
    static void     sohasdata(struct socket *so, void *arg, int waitflag);
    
    static struct accept_filter accf_data_filter = {
            .accf_name = "dataready",
            .accf_callback = sohasdata,
    };
    
    void accf_dataattach(int);
    void accf_dataattach(int num)
    {
            accept_filt_generic_mod_event(NULL, LKM_E_LOAD, &accf_data_filter);
    }
    
    /*
     * This code is to make DATA ready accept filer as LKM.
     * To compile as LKM we need to move this set of code into
     * another file and include this file for compilation when
     * making LKM
     */
    
    #ifdef _LKM
    static int accf_data_handle(struct lkm_table * lkmtp, int cmd);
    int accf_data_lkmentry(struct lkm_table * lkmtp, int cmd, int ver);
    
    MOD_MISC("accf_data");
    
    static int accf_data_handle(struct lkm_table * lkmtp, int cmd)
    {
            return accept_filt_generic_mod_event(lkmtp, cmd, &accf_data_filter);
    }
    
    /*
     * the module entry point.
     */
    int
    accf_data_lkmentry(struct lkm_table *lkmtp, int cmd, int ver)
    {
            DISPATCH(lkmtp, cmd, ver, accf_data_handle, accf_data_handle,
                accf_data_handle)
    }
    #endif
    
    static void
    sohasdata(struct socket *so, void *arg, int waitflag)
    {
    
            if (!soreadable(so))
                    return;
    
            so->so_upcall = NULL;
            so->so_rcv.sb_flags &= ~SB_UPCALL;
            soisconnected(so);
            return;
    }

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