1 /* $NetBSD: accf_data.c,v 1.8 2016/07/07 06:55:43 msaitoh 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 1.8 2016/07/07 06:55:43 msaitoh 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 #include "ioconf.h"
44
45 MODULE(MODULE_CLASS_MISC, accf_dataready, NULL);
46
47 /* accept filter that holds a socket until data arrives */
48
49 static void sohasdata(struct socket *so, void *arg, int events, int waitflag);
50
51 static struct accept_filter accf_data_filter = {
52 .accf_name = "dataready",
53 .accf_callback = sohasdata,
54 };
55
56 void
accf_dataattach(int junk)57 accf_dataattach(int junk)
58 {
59
60 }
61
62 static int
accf_dataready_modcmd(modcmd_t cmd,void * arg)63 accf_dataready_modcmd(modcmd_t cmd, void *arg)
64 {
65
66 switch (cmd) {
67 case MODULE_CMD_INIT:
68 return accept_filt_add(&accf_data_filter);
69
70 case MODULE_CMD_FINI:
71 return accept_filt_del(&accf_data_filter);
72
73 default:
74 return ENOTTY;
75 }
76 }
77
78 static void
sohasdata(struct socket * so,void * arg,int events,int waitflag)79 sohasdata(struct socket *so, void *arg, int events, int waitflag)
80 {
81
82 if (!soreadable(so))
83 return;
84
85 so->so_upcall = NULL;
86 so->so_rcv.sb_flags &= ~SB_UPCALL;
87 soisconnected(so);
88 return;
89 }
90