1 /* $NetBSD: npfext_log.c,v 1.5 2018/09/29 14:41:37 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Mindaugas Rasiukevicius. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __RCSID("$NetBSD: npfext_log.c,v 1.5 2018/09/29 14:41:37 rmind Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 #include <sys/ioctl.h> 38 #include <net/if.h> 39 40 #include <stdio.h> 41 #include <stdbool.h> 42 #include <string.h> 43 #include <assert.h> 44 #include <errno.h> 45 #include <err.h> 46 #include <unistd.h> 47 48 #include <npf.h> 49 50 int npfext_log_init(void); 51 nl_ext_t * npfext_log_construct(const char *); 52 int npfext_log_param(nl_ext_t *, const char *, const char *); 53 54 int 55 npfext_log_init(void) 56 { 57 /* Nothing to initialise. */ 58 return 0; 59 } 60 61 nl_ext_t * 62 npfext_log_construct(const char *name) 63 { 64 assert(strcmp(name, "log") == 0); 65 return npf_ext_construct(name); 66 } 67 68 int 69 npfext_log_param(nl_ext_t *ext, const char *param, const char *val __unused) 70 { 71 unsigned int if_idx; 72 73 assert(param != NULL); 74 75 if_idx = if_nametoindex(param); 76 if (if_idx == 0) { 77 int s; 78 struct ifreq ifr; 79 struct ifconf ifc; 80 81 if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) { 82 warn("Can't create datagram socket for `%s'", param); 83 return errno; 84 } 85 86 memset(&ifr, 0, sizeof(ifr)); 87 strlcpy(ifr.ifr_name, param, sizeof(ifr.ifr_name)); 88 if (ioctl(s, SIOCIFCREATE, &ifr) == -1) { 89 warn("Can't SIOCIFCREATE `%s'", param); 90 close(s); 91 return errno; 92 } 93 94 memset(&ifc, 0, sizeof(ifc)); 95 strlcpy(ifr.ifr_name, param, sizeof(ifr.ifr_name)); 96 if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) { 97 warn("Can't SIOCGIFFLAGS `%s'", param); 98 close(s); 99 return errno; 100 } 101 102 ifr.ifr_flags |= IFF_UP; 103 if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1) { 104 warn("Can't SIOCSIFFLAGS `%s'", param); 105 close(s); 106 return errno; 107 } 108 close(s); 109 110 if_idx = if_nametoindex(param); 111 if (if_idx == 0) 112 return EINVAL; 113 } 114 npf_ext_param_u32(ext, "log-interface", if_idx); 115 return 0; 116 } 117