1 /*- 2 * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: accf_data.c,v 1.1 2008/08/04 03:55:47 tls Exp $"); 29 30 #define ACCEPT_FILTER_MOD 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/lkm.h> 35 #include <sys/sysctl.h> 36 #include <sys/signalvar.h> 37 #include <sys/socketvar.h> 38 #include <netinet/accept_filter.h> 39 40 /* accept filter that holds a socket until data arrives */ 41 42 static void sohasdata(struct socket *so, void *arg, int waitflag); 43 44 static struct accept_filter accf_data_filter = { 45 "dataready", 46 sohasdata, 47 NULL, 48 NULL, 49 {NULL,} 50 }; 51 52 void accf_dataattach(int); 53 void accf_dataattach(int num) 54 { 55 accept_filt_generic_mod_event(NULL, LKM_E_LOAD, &accf_data_filter); 56 } 57 58 /* 59 * This code is to make DATA ready accept filer as LKM. 60 * To compile as LKM we need to move this set of code into 61 * another file and include this file for compilation when 62 * making LKM 63 */ 64 65 #ifdef _LKM 66 static int accf_data_handle(struct lkm_table * lkmtp, int cmd); 67 int accf_data_lkmentry(struct lkm_table * lkmtp, int cmd, int ver); 68 69 MOD_MISC("accf_data"); 70 71 static int accf_data_handle(struct lkm_table * lkmtp, int cmd) 72 { 73 return accept_filt_generic_mod_event(lkmtp, cmd, &accf_data_filter); 74 } 75 76 /* 77 * the module entry point. 78 */ 79 int 80 accf_data_lkmentry(struct lkm_table *lkmtp, int cmd, int ver) 81 { 82 DISPATCH(lkmtp, cmd, ver, accf_data_handle, accf_data_handle, 83 accf_data_handle) 84 } 85 #endif 86 87 static void 88 sohasdata(struct socket *so, void *arg, int waitflag) 89 { 90 91 if (!soreadable(so)) 92 return; 93 94 so->so_upcall = NULL; 95 so->so_rcv.sb_flags &= ~SB_UPCALL; 96 soisconnected(so); 97 return; 98 } 99