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 57 accf_dataattach(int junk) 58 { 59 60 } 61 62 static int 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 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