summaryrefslogtreecommitdiff
path: root/networking/brctl.c
blob: 2bb03dd8277883d56c80cf7b0ff6a0a1dc922c0b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/* vi: set sw=4 ts=4: */
/*
 * Small implementation of brctl for busybox.
 *
 * Copyright (C) 2008 by Bernhard Fischer
 *
 * Some helper functions from bridge-utils are
 * Copyright (C) 2000 Lennert Buytenhek
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
/* This applet currently uses only the ioctl interface and no sysfs at all.
 * At the time of this writing this was considered a feature.
 */
#include "libbb.h"
#include <linux/sockios.h>
#include <net/if.h>

/* Maximum number of ports supported per bridge interface.  */
#ifndef MAX_PORTS
#define MAX_PORTS 32
#endif

/* Use internal number parsing and not the "exact" conversion.  */
/* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */
#define BRCTL_USE_INTERNAL 1

#ifdef ENABLE_FEATURE_BRCTL_SHOW
#error Remove these
#endif
#define ENABLE_FEATURE_BRCTL_SHOW 0
#define USE_FEATURE_BRCTL_SHOW(...)

#if ENABLE_FEATURE_BRCTL_FANCY
#include <linux/if_bridge.h>

/* FIXME: These 4 funcs are not really clean and could be improved */
static ALWAYS_INLINE void strtotimeval(struct timeval *tv,
		const char *time_str)
{
	double secs;
#if BRCTL_USE_INTERNAL
	secs = /*bb_*/strtod(time_str, NULL);
	if (!secs)
#else
	if (sscanf(time_str, "%lf", &secs) != 1)
#endif
		bb_error_msg_and_die (bb_msg_invalid_arg, time_str, "timespec");
	tv->tv_sec = secs;
	tv->tv_usec = 1000000 * (secs - tv->tv_sec);
}

static ALWAYS_INLINE unsigned long __tv_to_jiffies(const struct timeval *tv)
{
	unsigned long long jif;

	jif = 1000000ULL * tv->tv_sec + tv->tv_usec;

	return jif/10000;
}
# if 0
static void __jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
{
	unsigned long long tvusec;

	tvusec = 10000ULL*jiffies;
	tv->tv_sec = tvusec/1000000;
	tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
}
# endif
static unsigned long str_to_jiffies(const char *time_str)
{
	struct timeval tv;
	strtotimeval(&tv, time_str);
	return __tv_to_jiffies(&tv);
}

static void arm_ioctl(unsigned long *args,
		unsigned long arg0, unsigned long arg1, unsigned long arg2)
{
	args[0] = arg0;
	args[1] = arg1;
	args[2] = arg2;
	args[3] = 0;
}
#endif


int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int brctl_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
	static const char keywords[] ALIGN1 =
		"addbr\0" "delbr\0" "addif\0" "delif\0"
	USE_FEATURE_BRCTL_FANCY(
		"stp\0"
		"setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
		"setpathcost\0" "setportprio\0" "setbridgeprio\0"
	)
		USE_FEATURE_BRCTL_SHOW("showmacs\0" "show\0");

	enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
		USE_FEATURE_BRCTL_FANCY(,
		   ARG_stp,
		   ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
		   ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
		)
		  USE_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show)
	};

	int fd;
	smallint key;
	struct ifreq ifr;
	char *br, *brif;
#if ENABLE_FEATURE_BRCTL_FANCY
	unsigned long args[4] = {0, 0, 0, 0};
	int port;
	int tmp;
#endif

	argv++;
	while (*argv) {
		key = index_in_strings(keywords, *argv);
		if (key == -1) /* no match found in keywords array, bail out. */
			bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
		argv++;
#if ENABLE_FEATURE_BRCTL_SHOW
		if (key == ARG_show) { /* show */
			goto out; /* FIXME: implement me! :) */
		}
#endif
		fd = xsocket(AF_INET, SOCK_STREAM, 0);
		br = *argv++;

		if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
			ioctl_or_perror_and_die(fd,
					key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
					br, "bridge %s", br);
			goto done;
		}
		if (!*argv) /* all but 'show' need at least one argument */
			bb_show_usage();
		safe_strncpy(ifr.ifr_name, br, IFNAMSIZ);
		if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
			brif = *argv++;
			ifr.ifr_ifindex = if_nametoindex(brif);
			if (!ifr.ifr_ifindex) {
				bb_perror_msg_and_die("iface %s", brif);
			}
			ioctl_or_perror_and_die(fd,
					key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
					&ifr, "bridge %s", br);
			goto done;
		}
#if ENABLE_FEATURE_BRCTL_FANCY
		ifr.ifr_data = (char *) &args;
		if (key == ARG_stp) { /* stp */
			/* FIXME: parsing yes/y/on/1 versus no/n/off/0 is too involved */
			arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE,
					  (unsigned)(**argv - '0'), 0);
			goto fire;
		}
		if ((unsigned)(key - ARG_stp) < 5) { /* time related ops */
			unsigned long op = (key == ARG_setageing) ? BRCTL_SET_AGEING_TIME :
			                   (key == ARG_setfd) ? BRCTL_SET_BRIDGE_FORWARD_DELAY :
			                   (key == ARG_sethello) ? BRCTL_SET_BRIDGE_HELLO_TIME :
			                   /*key == ARG_setmaxage*/ BRCTL_SET_BRIDGE_MAX_AGE;
			arm_ioctl(args, op, str_to_jiffies(*argv), 0);
			goto fire;
		}
		port = -1;
		if (key == ARG_setpathcost || key == ARG_setportprio) {/* get portnum */
			int ifidx[MAX_PORTS];
			unsigned i;

			port = if_nametoindex(*argv);
			if (!port)
				bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port");
			argv++;
			memset(ifidx, 0, sizeof ifidx);
			arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
					  MAX_PORTS);
			xioctl(fd, SIOCDEVPRIVATE, &ifr);
			for (i = 0; i < MAX_PORTS; i++) {
				if (ifidx[i] == port) {
					port = i;
					break;
				}
			}
		}
		if (key == ARG_setpathcost
		 || key == ARG_setportprio
		 || key == ARG_setbridgeprio
		) {
			unsigned long op = (key == ARG_setpathcost) ? BRCTL_SET_PATH_COST :
			                   (key == ARG_setportprio) ? BRCTL_SET_PORT_PRIORITY :
			                   /*key == ARG_setbridgeprio*/ BRCTL_SET_BRIDGE_PRIORITY;
			unsigned long arg1 = port;
			unsigned long arg2;
# if BRCTL_USE_INTERNAL
			tmp = xatoi(*argv);
# else
			if (sscanf(*argv, "%i", &tmp) != 1)
				bb_error_msg_and_die(bb_msg_invalid_arg, *argv,
						key == ARG_setpathcost ? "cost" : "prio");
# endif
			if (key == ARG_setbridgeprio) {
				arg1 = tmp;
				arg2 = 0;
			} else
				arg2 = tmp;
			arm_ioctl(args, op, arg1, arg2);
		}
 fire:
		/* Execute the previously set command.  */
		xioctl(fd, SIOCDEVPRIVATE, &ifr);
		argv++;
#endif
 done:
		if (ENABLE_FEATURE_CLEAN_UP)
			close(fd);
	}
 USE_FEATURE_BRCTL_SHOW(out:)
	return EXIT_SUCCESS;
}