path: root/networking/vconfig.c (plain)
blob: f3020409a2efcafab5552f2166b80f20f2027573

1	/* vi: set sw=4 ts=4: */
2	/*
3	* vconfig implementation for busybox
4	*
5	* Copyright (C) 2001 Manuel Novoa III <mjn3@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
8	*/
9
10	/* BB_AUDIT SUSv3 N/A */
11
12	//config:config VCONFIG
13	//config: bool "vconfig"
14	//config: default y
15	//config: select PLATFORM_LINUX
16	//config: help
17	//config: Creates, removes, and configures VLAN interfaces
18
19	//applet:IF_VCONFIG(APPLET(vconfig, BB_DIR_SBIN, BB_SUID_DROP))
20
21	//kbuild:lib-$(CONFIG_VCONFIG) += vconfig.o
22
23	//usage:#define vconfig_trivial_usage
24	//usage: "COMMAND [OPTIONS]"
25	//usage:#define vconfig_full_usage "\n\n"
26	//usage: "Create and remove virtual ethernet devices\n"
27	//usage: "\n add IFACE VLAN_ID"
28	//usage: "\n rem VLAN_NAME"
29	//usage: "\n set_flag IFACE 0|1 VLAN_QOS"
30	//usage: "\n set_egress_map VLAN_NAME SKB_PRIO VLAN_QOS"
31	//usage: "\n set_ingress_map VLAN_NAME SKB_PRIO VLAN_QOS"
32	//usage: "\n set_name_type NAME_TYPE"
33
34	#include "libbb.h"
35	#include <net/if.h>
36
37	/* Stuff from linux/if_vlan.h, kernel version 2.4.23 */
38	enum vlan_ioctl_cmds {
39	ADD_VLAN_CMD,
40	DEL_VLAN_CMD,
41	SET_VLAN_INGRESS_PRIORITY_CMD,
42	SET_VLAN_EGRESS_PRIORITY_CMD,
43	GET_VLAN_INGRESS_PRIORITY_CMD,
44	GET_VLAN_EGRESS_PRIORITY_CMD,
45	SET_VLAN_NAME_TYPE_CMD,
46	SET_VLAN_FLAG_CMD
47	};
48	enum vlan_name_types {
49	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
50	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
51	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
52	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
53	VLAN_NAME_TYPE_HIGHEST
54	};
55
56	struct vlan_ioctl_args {
57	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
58	char device1[24];
59
60	union {
61	char device2[24];
62	int VID;
63	unsigned int skb_priority;
64	unsigned int name_type;
65	unsigned int bind_type;
66	unsigned int flag; /* Matches vlan_dev_info flags */
67	} u;
68
69	short vlan_qos;
70	};
71
72	#define VLAN_GROUP_ARRAY_LEN 4096
73	#define SIOCSIFVLAN 0x8983 /* Set 802.1Q VLAN options */
74
75	/* On entry, table points to the length of the current string
76	* plus NUL terminator plus data length for the subsequent entry.
77	* The return value is the last data entry for the matching string. */
78	static const char *xfind_str(const char *table, const char *str)
79	{
80	while (strcasecmp(str, table + 1) != 0) {
81	if (!table[0])
82	bb_show_usage();
83	table += table[0];
84	}
85	return table - 1;
86	}
87
88	static const char cmds[] ALIGN1 = {
89	4, ADD_VLAN_CMD, 7,
90	'a','d','d',0,
91	3, DEL_VLAN_CMD, 7,
92	'r','e','m',0,
93	3, SET_VLAN_NAME_TYPE_CMD, 17,
94	's','e','t','_','n','a','m','e','_','t','y','p','e',0,
95	5, SET_VLAN_FLAG_CMD, 12,
96	's','e','t','_','f','l','a','g',0,
97	5, SET_VLAN_EGRESS_PRIORITY_CMD, 18,
98	's','e','t','_','e','g','r','e','s','s','_','m','a','p',0,
99	5, SET_VLAN_INGRESS_PRIORITY_CMD, 0,
100	's','e','t','_','i','n','g','r','e','s','s','_','m','a','p',0,
101	};
102
103	static const char name_types[] ALIGN1 = {
104	VLAN_NAME_TYPE_PLUS_VID, 16,
105	'V','L','A','N','_','P','L','U','S','_','V','I','D',0,
106	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, 22,
107	'V','L','A','N','_','P','L','U','S','_','V','I','D','_','N','O','_','P','A','D',0,
108	VLAN_NAME_TYPE_RAW_PLUS_VID, 15,
109	'D','E','V','_','P','L','U','S','_','V','I','D',0,
110	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, 0,
111	'D','E','V','_','P','L','U','S','_','V','I','D','_','N','O','_','P','A','D',0,
112	};
113
114	int vconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
115	int vconfig_main(int argc, char **argv)
116	{
117	struct vlan_ioctl_args ifr;
118	const char *p;
119	int fd;
120
121	memset(&ifr, 0, sizeof(ifr));
122
123	++argv;
124	if (!argv[0])
125	bb_show_usage();
126	p = xfind_str(cmds + 2, argv[0]);
127	ifr.cmd = *p;
128	if (argc != p[-1])
129	bb_show_usage();
130
131	if (ifr.cmd == SET_VLAN_NAME_TYPE_CMD) {
132	/* set_name_type */
133	ifr.u.name_type = *xfind_str(name_types + 1, argv[1]);
134	} else {
135	strncpy_IFNAMSIZ(ifr.device1, argv[1]);
136	p = argv[2];
137
138	/* I suppose one could try to combine some of the function calls below,
139	* since ifr.u.flag, ifr.u.VID, and ifr.u.skb_priority are all same-sized
140	* (unsigned) int members of a unions. But because of the range checking,
141	* doing so wouldn't save that much space and would also make maintainence
142	* more of a pain.
143	*/
144	if (ifr.cmd == SET_VLAN_FLAG_CMD) {
145	/* set_flag */
146	ifr.u.flag = xatou_range(p, 0, 1);
147	/* DM: in order to set reorder header, qos must be set */
148	ifr.vlan_qos = xatou_range(argv[3], 0, 7);
149	} else if (ifr.cmd == ADD_VLAN_CMD) {
150	/* add */
151	ifr.u.VID = xatou_range(p, 0, VLAN_GROUP_ARRAY_LEN - 1);
152	} else if (ifr.cmd != DEL_VLAN_CMD) {
153	/* set_{egress|ingress}_map */
154	ifr.u.skb_priority = xatou(p);
155	ifr.vlan_qos = xatou_range(argv[3], 0, 7);
156	}
157	}
158
159	fd = xsocket(AF_INET, SOCK_STREAM, 0);
160	ioctl_or_perror_and_die(fd, SIOCSIFVLAN, &ifr,
161	"ioctl error for %s", argv[0]);
162
163	return 0;
164	}
165