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 <netlink/route/link.h>
11 #include <netlink/route/link/vlan.h>
12
13 #include "utils/common.h"
14 #include "vlan_util.h"
15
16 /*
17 * Add a vlan interface with name 'vlan_if_name', VLAN ID 'vid' and
18 * tagged interface 'if_name'.
19 *
20 * returns -1 on error
21 * returns 1 if the interface already exists
22 * returns 0 otherwise
23 */
vlan_add(const char * if_name,int vid,const char * vlan_if_name)24 int vlan_add(const char *if_name, int vid, const char *vlan_if_name)
25 {
26 int err, ret = -1;
27 struct nl_sock *handle = NULL;
28 struct rtnl_link *rlink = NULL;
29 int if_idx = 0;
30
31 wpa_printf(MSG_DEBUG, "VLAN: vlan_add(if_name=%s, vid=%d, "
32 "vlan_if_name=%s)", if_name, vid, vlan_if_name);
33
34 if ((os_strlen(if_name) + 1) > IFNAMSIZ) {
35 wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
36 if_name);
37 return -1;
38 }
39
40 if ((os_strlen(vlan_if_name) + 1) > IFNAMSIZ) {
41 wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
42 vlan_if_name);
43 return -1;
44 }
45
46 handle = nl_socket_alloc();
47 if (!handle) {
48 wpa_printf(MSG_ERROR, "VLAN: failed to open netlink socket");
49 goto vlan_add_error;
50 }
51
52 err = nl_connect(handle, NETLINK_ROUTE);
53 if (err < 0) {
54 wpa_printf(MSG_ERROR, "VLAN: failed to connect to netlink: %s",
55 nl_geterror(err));
56 goto vlan_add_error;
57 }
58
59 err = rtnl_link_get_kernel(handle, 0, if_name, &rlink);
60 if (err < 0) {
61 /* link does not exist */
62 wpa_printf(MSG_ERROR, "VLAN: interface %s does not exist",
63 if_name);
64 goto vlan_add_error;
65 }
66 if_idx = rtnl_link_get_ifindex(rlink);
67 rtnl_link_put(rlink);
68 rlink = NULL;
69
70 err = rtnl_link_get_kernel(handle, 0, vlan_if_name, &rlink);
71 if (err >= 0) {
72 /* link does exist */
73 rtnl_link_put(rlink);
74 rlink = NULL;
75 wpa_printf(MSG_ERROR, "VLAN: interface %s already exists",
76 vlan_if_name);
77 ret = 1;
78 goto vlan_add_error;
79 }
80
81 rlink = rtnl_link_alloc();
82 if (!rlink) {
83 wpa_printf(MSG_ERROR, "VLAN: failed to allocate new link");
84 goto vlan_add_error;
85 }
86
87 err = rtnl_link_set_type(rlink, "vlan");
88 if (err < 0) {
89 wpa_printf(MSG_ERROR, "VLAN: failed to set link type: %s",
90 nl_geterror(err));
91 goto vlan_add_error;
92 }
93
94 rtnl_link_set_link(rlink, if_idx);
95 rtnl_link_set_name(rlink, vlan_if_name);
96
97 err = rtnl_link_vlan_set_id(rlink, vid);
98 if (err < 0) {
99 wpa_printf(MSG_ERROR, "VLAN: failed to set link vlan id: %s",
100 nl_geterror(err));
101 goto vlan_add_error;
102 }
103
104 err = rtnl_link_add(handle, rlink, NLM_F_CREATE);
105 if (err < 0) {
106 wpa_printf(MSG_ERROR, "VLAN: failed to create link %s for "
107 "vlan %d on %s (%d): %s",
108 vlan_if_name, vid, if_name, if_idx,
109 nl_geterror(err));
110 goto vlan_add_error;
111 }
112
113 ret = 0;
114
115 vlan_add_error:
116 if (rlink)
117 rtnl_link_put(rlink);
118 if (handle)
119 nl_socket_free(handle);
120 return ret;
121 }
122
123
vlan_rem(const char * if_name)124 int vlan_rem(const char *if_name)
125 {
126 int err, ret = -1;
127 struct nl_sock *handle = NULL;
128 struct rtnl_link *rlink = NULL;
129
130 wpa_printf(MSG_DEBUG, "VLAN: vlan_rem(if_name=%s)", if_name);
131
132 handle = nl_socket_alloc();
133 if (!handle) {
134 wpa_printf(MSG_ERROR, "VLAN: failed to open netlink socket");
135 goto vlan_rem_error;
136 }
137
138 err = nl_connect(handle, NETLINK_ROUTE);
139 if (err < 0) {
140 wpa_printf(MSG_ERROR, "VLAN: failed to connect to netlink: %s",
141 nl_geterror(err));
142 goto vlan_rem_error;
143 }
144
145 err = rtnl_link_get_kernel(handle, 0, if_name, &rlink);
146 if (err < 0) {
147 /* link does not exist */
148 wpa_printf(MSG_ERROR, "VLAN: interface %s does not exists",
149 if_name);
150 goto vlan_rem_error;
151 }
152
153 err = rtnl_link_delete(handle, rlink);
154 if (err < 0) {
155 wpa_printf(MSG_ERROR, "VLAN: failed to remove link %s: %s",
156 if_name, nl_geterror(err));
157 goto vlan_rem_error;
158 }
159
160 ret = 0;
161
162 vlan_rem_error:
163 if (rlink)
164 rtnl_link_put(rlink);
165 if (handle)
166 nl_socket_free(handle);
167 return ret;
168 }
169
170
vlan_set_name_type(unsigned int name_type)171 int vlan_set_name_type(unsigned int name_type)
172 {
173 return 0;
174 }
175