Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / ap / vlan_util.c
CommitLineData
4781064b
JM
1/*
2 * hostapd / VLAN netlink api
3 * Copyright (c) 2012, Michael Braun <michael-dev@fami-braun.de>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "utils/includes.h"
10#include <sys/ioctl.h>
11#include <linux/sockios.h>
12#include <linux/if_vlan.h>
13#include <netlink/genl/genl.h>
14#include <netlink/genl/family.h>
15#include <netlink/genl/ctrl.h>
16#include <netlink/route/link.h>
17#include <netlink/route/link/vlan.h>
18
19#include "utils/common.h"
20#include "utils/eloop.h"
21#include "hostapd.h"
22#include "vlan_util.h"
23
24/*
25 * Add a vlan interface with name 'vlan_if_name', VLAN ID 'vid' and
26 * tagged interface 'if_name'.
27 *
28 * returns -1 on error
29 * returns 1 if the interface already exists
30 * returns 0 otherwise
31*/
32int vlan_add(const char *if_name, int vid, const char *vlan_if_name)
33{
34 int ret = -1;
35 struct nl_sock *handle = NULL;
36 struct nl_cache *cache = NULL;
37 struct rtnl_link *rlink = NULL;
38 int if_idx = 0;
39
40 wpa_printf(MSG_DEBUG, "VLAN: vlan_add(if_name=%s, vid=%d, "
41 "vlan_if_name=%s)", if_name, vid, vlan_if_name);
42
43 if ((os_strlen(if_name) + 1) > IFNAMSIZ) {
44 wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
45 if_name);
46 return -1;
47 }
48
49 if ((os_strlen(vlan_if_name) + 1) > IFNAMSIZ) {
50 wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
51 vlan_if_name);
52 return -1;
53 }
54
55 handle = nl_socket_alloc();
56 if (!handle) {
57 wpa_printf(MSG_ERROR, "VLAN: failed to open netlink socket");
58 goto vlan_add_error;
59 }
60
61 if (nl_connect(handle, NETLINK_ROUTE) < 0) {
62 wpa_printf(MSG_ERROR, "VLAN: failed to connect to netlink");
63 goto vlan_add_error;
64 }
65
66 if (rtnl_link_alloc_cache(handle, AF_UNSPEC, &cache) < 0) {
67 cache = NULL;
68 wpa_printf(MSG_ERROR, "VLAN: failed to alloc cache");
69 goto vlan_add_error;
70 }
71
72 if (!(if_idx = rtnl_link_name2i(cache, if_name))) {
73 /* link does not exist */
74 wpa_printf(MSG_ERROR, "VLAN: interface %s does not exist",
75 if_name);
76 goto vlan_add_error;
77 }
78
79 if ((rlink = rtnl_link_get_by_name(cache, vlan_if_name))) {
80 /* link does exist */
81 rtnl_link_put(rlink);
82 rlink = NULL;
83 wpa_printf(MSG_ERROR, "VLAN: interface %s already exists",
84 vlan_if_name);
85 ret = 1;
86 goto vlan_add_error;
87 }
88
89 rlink = rtnl_link_alloc();
90 if (!rlink) {
91 wpa_printf(MSG_ERROR, "VLAN: failed to allocate new link");
92 goto vlan_add_error;
93 }
94
95 if (rtnl_link_set_type(rlink, "vlan") < 0) {
96 wpa_printf(MSG_ERROR, "VLAN: failed to set link type");
97 goto vlan_add_error;
98 }
99
100 rtnl_link_set_link(rlink, if_idx);
101 rtnl_link_set_name(rlink, vlan_if_name);
102
103 if (rtnl_link_vlan_set_id(rlink, vid) < 0) {
104 wpa_printf(MSG_ERROR, "VLAN: failed to set link vlan id");
105 goto vlan_add_error;
106 }
107
108 if (rtnl_link_add(handle, rlink, NLM_F_CREATE) < 0) {
109 wpa_printf(MSG_ERROR, "VLAN: failed to create link %s for "
110 "vlan %d on %s (%d)",
111 vlan_if_name, vid, if_name, if_idx);
112 goto vlan_add_error;
113 }
114
115 ret = 0;
116
117vlan_add_error:
118 if (rlink)
119 rtnl_link_put(rlink);
120 if (cache)
121 nl_cache_free(cache);
122 if (handle)
123 nl_socket_free(handle);
124 return ret;
125}
126
127
128int vlan_rem(const char *if_name)
129{
130 int ret = -1;
131 struct nl_sock *handle = NULL;
132 struct nl_cache *cache = NULL;
133 struct rtnl_link *rlink = NULL;
134
135 wpa_printf(MSG_DEBUG, "VLAN: vlan_rem(if_name=%s)", if_name);
136
137 handle = nl_socket_alloc();
138 if (!handle) {
139 wpa_printf(MSG_ERROR, "VLAN: failed to open netlink socket");
140 goto vlan_rem_error;
141 }
142
143 if (nl_connect(handle, NETLINK_ROUTE) < 0) {
144 wpa_printf(MSG_ERROR, "VLAN: failed to connect to netlink");
145 goto vlan_rem_error;
146 }
147
148 if (rtnl_link_alloc_cache(handle, AF_UNSPEC, &cache) < 0) {
149 cache = NULL;
150 wpa_printf(MSG_ERROR, "VLAN: failed to alloc cache");
151 goto vlan_rem_error;
152 }
153
154 if (!(rlink = rtnl_link_get_by_name(cache, if_name))) {
155 /* link does not exist */
156 wpa_printf(MSG_ERROR, "VLAN: interface %s does not exists",
157 if_name);
158 goto vlan_rem_error;
159 }
160
161 if (rtnl_link_delete(handle, rlink) < 0) {
162 wpa_printf(MSG_ERROR, "VLAN: failed to remove link %s",
163 if_name);
164 goto vlan_rem_error;
165 }
166
167 ret = 0;
168
169vlan_rem_error:
170 if (rlink)
171 rtnl_link_put(rlink);
172 if (cache)
173 nl_cache_free(cache);
174 if (handle)
175 nl_socket_free(handle);
176 return ret;
177}