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
npfext_log_init(void)55 npfext_log_init(void)
56 {
57 /* Nothing to initialise. */
58 return 0;
59 }
60
61 nl_ext_t *
npfext_log_construct(const char * name)62 npfext_log_construct(const char *name)
63 {
64 assert(strcmp(name, "log") == 0);
65 return npf_ext_construct(name);
66 }
67
68 int
npfext_log_param(nl_ext_t * ext,const char * param,const char * val __unused)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