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npfext_log.c revision 1.3 
      1 /*	$NetBSD: npfext_log.c,v 1.3 2013/03/11 00:18:11 christos 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 1.3 2013/03/11 00:18:11 christos 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 <string.h>
     41 #include <assert.h>
     42 #include <errno.h>
     43 #include <err.h>
     44 #include <unistd.h>
     45 
     46 #include <npf.h>
     47 
     48 int		npfext_log_init(void);
     49 nl_ext_t *	npfext_log_construct(const char *);
     50 int		npfext_log_param(nl_ext_t *, const char *, const char *);
     51 
     52 int
     53 npfext_log_init(void)
     54 {
     55 	/* Nothing to initialise. */
     56 	return 0;
     57 }
     58 
     59 nl_ext_t *
     60 npfext_log_construct(const char *name)
     61 {
     62 	assert(strcmp(name, "log") == 0);
     63 	return npf_ext_construct(name);
     64 }
     65 
     66 int
     67 npfext_log_param(nl_ext_t *ext, const char *param, const char *val __unused)
     68 {
     69 	unsigned long if_idx;
     70 
     71 	assert(param != NULL);
     72 
     73 	if_idx = if_nametoindex(param);
     74 	if (if_idx == 0) {
     75 		int s;
     76 		struct ifreq ifr;
     77 		struct ifconf ifc;
     78 
     79 		if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
     80 			warn("Can't create datagram socket for `%s'", param);
     81 			return errno;
     82 		}
     83 
     84 		memset(&ifr, 0, sizeof(ifr));
     85 		strlcpy(ifr.ifr_name, param, sizeof(ifr.ifr_name));
     86 		if (ioctl(s, SIOCIFCREATE, &ifr) == -1) {
     87 			warn("Can't SIOCIFCREATE `%s'", param);
     88 			close(s);
     89 			return errno;
     90 		}
     91 
     92 		memset(&ifc, 0, sizeof(ifc));
     93 		strlcpy(ifr.ifr_name, param, sizeof(ifr.ifr_name));
     94 		if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
     95 			warn("Can't SIOCGIFFLAGS `%s'", param);
     96 			close(s);
     97 			return errno;
     98 		}
     99 
    100 		ifr.ifr_flags |= IFF_UP;
    101 		if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1) {
    102 			warn("Can't SIOCSIFFLAGS `%s'", param);
    103 			close(s);
    104 			return errno;
    105 		}
    106 		close(s);
    107 
    108 		if_idx = if_nametoindex(param);
    109 		if (if_idx == 0)
    110 			return EINVAL;
    111 	}
    112 	npf_ext_param_u32(ext, "log-interface", if_idx);
    113 	return 0;
    114 }
    115