source: rtems-libbsd/dhcpcd/platform-bsd.c @ 1378632

55-freebsd-126-freebsd-12
Last change on this file since 1378632 was f2ed769, checked in by Sebastian Huber <sebastian.huber@…>, on 01/30/14 at 12:29:46

DHCPCD(8): Import

Import DHCPCD(8) from:

http://roy.marples.name/projects/dhcpcd/

The upstream sources can be obtained via:

fossil clone http://roy.marples.name/projects/dhcpcd

The imported version is 2014-01-29 19:46:44 [6b209507bb].

  • Property mode set to 100644
File size: 4.4 KB
Line 
1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2014 Roy Marples <roy@marples.name>
4 * All rights reserved
5
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/ioctl.h>
29#include <sys/param.h>
30#include <sys/socket.h>
31#include <sys/sysctl.h>
32#include <sys/utsname.h>
33
34#include <net/if.h>
35#ifdef __FreeBSD__ /* Needed so that including netinet6/in6_var.h works */
36#  include <net/if_var.h>
37#endif
38#include <netinet/in.h>
39#include <netinet6/in6_var.h>
40
41#include <errno.h>
42#include <stdlib.h>
43#include <string.h>
44#include <syslog.h>
45#include <unistd.h>
46
47#include "common.h"
48#include "dhcpcd.h"
49#include "if-options.h"
50#include "platform.h"
51
52#ifndef SYS_NMLN        /* OSX */
53#  define SYS_NMLN 256
54#endif
55
56static char march[SYS_NMLN];
57
58char *
59hardware_platform(void)
60{
61        int mib[2] = { CTL_HW, HW_MACHINE_ARCH };
62        size_t len = sizeof(march);
63
64        if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
65                march, &len, NULL, 0) != 0)
66                return NULL;
67        return march;
68}
69
70#ifdef INET6
71#define get_inet6_sysctl(code) inet6_sysctl(code, 0, 0)
72#define set_inet6_sysctl(code, val) inet6_sysctl(code, val, 1)
73static int
74inet6_sysctl(int code, int val, int action)
75{
76        int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
77        size_t size;
78
79        mib[3] = code;
80        size = sizeof(val);
81        if (action) {
82                if (sysctl(mib, sizeof(mib)/sizeof(mib[0]),
83                    NULL, 0, &val, size) == -1)
84                        return -1;
85                return 0;
86        }
87        if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &val, &size, NULL, 0) == -1)
88                return -1;
89        return val;
90}
91
92static void
93restore_kernel_ra(void)
94{
95
96        if (options & DHCPCD_FORKED)
97                return;
98        syslog(LOG_INFO, "restoring Kernel IPv6 RA support");
99        if (set_inet6_sysctl(IPV6CTL_ACCEPT_RTADV, 1) == -1)
100                syslog(LOG_ERR, "IPV6CTL_ACCEPT_RTADV: %m");
101}
102
103static int
104ipv6_ra_flush(void)
105{
106        int s;
107        char dummy[IFNAMSIZ + 8];
108
109        s = socket(AF_INET6, SOCK_DGRAM, 0);
110        if (s == -1)
111                return -1;
112        strcpy(dummy, "lo0");
113        if (ioctl(s, SIOCSRTRFLUSH_IN6, (caddr_t)&dummy) == -1)
114                syslog(LOG_ERR, "SIOSRTRFLUSH_IN6: %m");
115        if (ioctl(s, SIOCSPFXFLUSH_IN6, (caddr_t)&dummy) == -1)
116                syslog(LOG_ERR, "SIOSPFXFLUSH_IN6: %m");
117        close(s);
118        return 0;
119}
120
121int
122check_ipv6(const char *ifname, int own)
123{
124        static int set_restore = 0, global_ra = 0;
125        int ra;
126
127        /* BSD doesn't support these values per iface, so just return
128         * the global ra setting */
129        if (ifname)
130                return global_ra;
131
132        ra = get_inet6_sysctl(IPV6CTL_ACCEPT_RTADV);
133        if (ra == -1)
134                /* The sysctl probably doesn't exist, but this isn't an
135                 * error as such so just log it and continue */
136                syslog(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
137                    "IPV6CTL_ACCEPT_RTADV: %m");
138        else if (ra != 0 && own) {
139                syslog(LOG_INFO, "disabling Kernel IPv6 RA support");
140                if (set_inet6_sysctl(IPV6CTL_ACCEPT_RTADV, 0) == -1) {
141                        syslog(LOG_ERR, "IPV6CTL_ACCEPT_RTADV: %m");
142                        return ra;
143                }
144                if (!set_restore) {
145                        set_restore = 1;
146                        atexit(restore_kernel_ra);
147                }
148                ra = 0;
149
150                /* Flush the kernel knowledge of advertised routers
151                 * and prefixes so the kernel does not expire prefixes
152                 * and default routes we are trying to own. */
153                ipv6_ra_flush();
154        }
155        if (ifname == NULL)
156                global_ra = ra;
157
158        return ra;
159}
160
161int
162ipv6_dadtransmits(__unused const char *ifname)
163{
164        int r;
165
166        r = get_inet6_sysctl(IPV6CTL_DAD_COUNT);
167        return r < 0 ? 0 : r;
168}
169#endif
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