sys/netinet/accf_data.c

   1 /*      $NetBSD: accf_data.c,v 1.5 2008/11/20 10:22:11 ad Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __KERNEL_RCSID(0, "$NetBSD: accf_data.c,v 1.5 2008/11/20 10:22:11 ad Exp $");
  31
  32 #define ACCEPT_FILTER_MOD
  33
  34 #include <sys/param.h>
  35 #include <sys/kernel.h>
  36 #include <sys/module.h>
  37 #include <sys/sysctl.h>
  38 #include <sys/signalvar.h>
  39 #include <sys/socketvar.h>
  40
  41 #include <netinet/accept_filter.h>
  42
  43 MODULE(MODULE_CLASS_MISC, accf_dataready, NULL);
  44
  45 /* accept filter that holds a socket until data arrives */
  46
  47 static void     sohasdata(struct socket *so, void *arg, int events, int waitflag);
  48
  49 static struct accept_filter accf_data_filter = {
  50         .accf_name = "dataready",
  51         .accf_callback = sohasdata,
  52 };
  53
  54 /* XXX pseudo-device */
  55 void    accf_dataattach(int);
  56
  57 void
  58 accf_dataattach(int junk)
  59 {
  60
  61 }
  62
  63 static int
  64 accf_dataready_modcmd(modcmd_t cmd, void *arg)
  65 {
  66
  67         switch (cmd) {
  68         case MODULE_CMD_INIT:
  69                 return accept_filt_add(&accf_data_filter);
  70
  71         case MODULE_CMD_FINI:
  72                 return accept_filt_del(&accf_data_filter);
  73
  74         default:
  75                 return ENOTTY;
  76         }
  77 }
  78
  79 static void
  80 sohasdata(struct socket *so, void *arg, int events, int waitflag)
  81 {
  82
  83         if (!soreadable(so))
  84                 return;
  85
  86         so->so_upcall = NULL;
  87         so->so_rcv.sb_flags &= ~SB_UPCALL;
  88         soisconnected(so);
  89         return;
  90 }