1 /* vi: set sw=4 ts=4: */
3 * nameif.c - Naming Interfaces based on MAC address for busybox.
5 * Written 2000 by Andi Kleen.
6 * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
8 * Extended matching support 2008 by Nico Erfurth <masta@perlgolf.de>
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 //config:config NAMEIF
14 //config: bool "nameif (6.6 kb)"
16 //config: select PLATFORM_LINUX
17 //config: select FEATURE_SYSLOG
19 //config: nameif is used to rename network interface by its MAC address.
20 //config: Renamed interfaces MUST be in the down state.
21 //config: It is possible to use a file (default: /etc/mactab)
22 //config: with list of new interface names and MACs.
23 //config: Maximum interface name length: IFNAMSIZ = 16
24 //config: File fields are separated by space or tab.
25 //config: File format:
27 //config: new_interface_name XX:XX:XX:XX:XX:XX
29 //config:config FEATURE_NAMEIF_EXTENDED
30 //config: bool "Extended nameif"
32 //config: depends on NAMEIF
34 //config: This extends the nameif syntax to support the bus_info, driver,
35 //config: phyaddr selectors. The syntax is compatible to the normal nameif.
36 //config: File format:
37 //config: new_interface_name driver=asix bus=usb-0000:00:08.2-3
38 //config: new_interface_name bus=usb-0000:00:08.2-3 00:80:C8:38:91:B5
39 //config: new_interface_name phy_address=2 00:80:C8:38:91:B5
40 //config: new_interface_name mac=00:80:C8:38:91:B5
41 //config: new_interface_name 00:80:C8:38:91:B5
43 //applet:IF_NAMEIF(APPLET(nameif, BB_DIR_SBIN, BB_SUID_DROP))
45 //kbuild:lib-$(CONFIG_NAMEIF) += nameif.o
47 //usage:#define nameif_trivial_usage
48 //usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
49 //usage: "[-s] [-c FILE] [IFNAME HWADDR]..."
51 //usage: IF_FEATURE_NAMEIF_EXTENDED(
52 //usage: "[-s] [-c FILE] [IFNAME SELECTOR]..."
54 //usage:#define nameif_full_usage "\n\n"
55 //usage: "Rename network interface while it in the down state."
56 //usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
57 //usage: "\nThe device with address HWADDR is renamed to IFACE."
59 //usage: IF_FEATURE_NAMEIF_EXTENDED(
60 //usage: "\nThe device matched by SELECTOR is renamed to IFACE."
61 //usage: "\nSELECTOR can be a combination of:"
62 //usage: "\n driver=STRING"
63 //usage: "\n bus=STRING"
64 //usage: "\n phy_address=NUM"
65 //usage: "\n [mac=]XX:XX:XX:XX:XX:XX"
68 //usage: "\n -c FILE Configuration file (default: /etc/mactab)"
69 //usage: "\n -s Log to syslog"
71 //usage:#define nameif_example_usage
72 //usage: "$ nameif -s dmz0 00:A0:C9:8C:F6:3F\n"
74 //usage: "$ nameif -c /etc/my_mactab_file\n"
79 #include <netinet/ether.h>
80 #include <linux/sockios.h>
86 /* Taken from linux/sockios.h */
87 #define SIOCSIFNAME 0x8923 /* set interface name */
89 /* Octets in one Ethernet addr, from <linux/if_ether.h> */
93 #define ifr_newname ifr_ifru.ifru_slave
96 typedef struct ethtable_s {
97 struct ethtable_s *next;
98 struct ethtable_s *prev;
100 struct ether_addr *mac;
101 #if ENABLE_FEATURE_NAMEIF_EXTENDED
108 #if ENABLE_FEATURE_NAMEIF_EXTENDED
109 /* Cut'n'paste from ethtool.h */
110 #define ETHTOOL_BUSINFO_LEN 32
111 /* these strings are set to whatever the driver author decides... */
112 struct ethtool_drvinfo {
114 char driver[32]; /* driver short name, "tulip", "eepro100" */
115 char version[32]; /* driver version string */
116 char fw_version[32]; /* firmware version string, if applicable */
117 char bus_info[ETHTOOL_BUSINFO_LEN]; /* Bus info for this IF. */
118 /* For PCI devices, use pci_dev->slot_name. */
121 uint32_t n_stats; /* number of u64's from ETHTOOL_GSTATS */
122 uint32_t testinfo_len;
123 uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
124 uint32_t regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
129 uint32_t supported; /* Features this interface supports */
130 uint32_t advertising; /* Features this interface advertises */
131 uint16_t speed; /* The forced speed, 10Mb, 100Mb, gigabit */
132 uint8_t duplex; /* Duplex, half or full */
133 uint8_t port; /* Which connector port */
135 uint8_t transceiver; /* Which transceiver to use */
136 uint8_t autoneg; /* Enable or disable autonegotiation */
137 uint32_t maxtxpkt; /* Tx pkts before generating tx int */
138 uint32_t maxrxpkt; /* Rx pkts before generating rx int */
141 uint32_t reserved[3];
144 #define ETHTOOL_GSET 0x00000001 /* Get settings. */
145 #define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
149 static void nameif_parse_selector(ethtable_t *ch, char *selector)
151 struct ether_addr *lmac;
152 #if ENABLE_FEATURE_NAMEIF_EXTENDED
153 int found_selector = 0;
158 selector = skip_whitespace(selector);
159 #if ENABLE_FEATURE_NAMEIF_EXTENDED
160 ch->phy_address = -1;
161 if (*selector == '\0')
163 /* Search for the end .... */
164 next = skip_non_whitespace(selector);
167 /* Check for selectors, mac= is assumed */
168 if (is_prefixed_with(selector, "bus=")) {
169 ch->bus_info = xstrdup(selector + 4);
171 } else if (is_prefixed_with(selector, "driver=")) {
172 ch->driver = xstrdup(selector + 7);
174 } else if (is_prefixed_with(selector, "phyaddr=")) {
175 ch->phy_address = xatoi_positive(selector + 8);
179 lmac = xmalloc(ETH_ALEN);
180 ch->mac = ether_aton_r(selector + (is_prefixed_with(selector, "mac=") ? 4 : 0), lmac);
182 bb_error_msg_and_die("can't parse %s", selector);
183 #if ENABLE_FEATURE_NAMEIF_EXTENDED
188 if (found_selector == 0)
189 bb_error_msg_and_die("no selectors found for %s", ch->ifname);
193 static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
196 if (strlen(ifname) >= IFNAMSIZ)
197 bb_error_msg_and_die("interface name '%s' too long", ifname);
198 ch = xzalloc(sizeof(*ch));
199 ch->ifname = xstrdup(ifname);
200 nameif_parse_selector(ch, selector);
207 #if ENABLE_FEATURE_CLEAN_UP
208 static void delete_eth_table(ethtable_t *ch)
211 #if ENABLE_FEATURE_NAMEIF_EXTENDED
219 void delete_eth_table(ethtable_t *ch);
222 int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
223 int nameif_main(int argc UNUSED_PARAM, char **argv)
225 ethtable_t *clist = NULL;
226 const char *fname = "/etc/mactab";
232 if (1 & getopt32(argv, "sc:", &fname)) {
233 openlog(applet_name, 0, LOG_LOCAL0);
234 /* Why not just "="? I assume logging to stderr
235 * can't hurt. 2>/dev/null if you don't like it: */
236 logmode |= LOGMODE_SYSLOG;
244 prepend_new_eth_table(&clist, argv[0], argv[1]);
248 parser = config_open(fname);
249 while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL))
250 prepend_new_eth_table(&clist, token[0], token[1]);
251 config_close(parser);
254 ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
255 parser = config_open2("/proc/net/dev", xfopen_for_read);
257 while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
259 #if ENABLE_FEATURE_NAMEIF_EXTENDED
260 struct ethtool_drvinfo drvinfo;
261 struct ethtool_cmd eth_settings;
263 if (parser->lineno <= 2)
264 continue; /* Skip the first two lines */
266 /* Find the current interface name and copy it to ifr.ifr_name */
267 memset(&ifr, 0, sizeof(struct ifreq));
268 strncpy_IFNAMSIZ(ifr.ifr_name, token[0]);
270 #if ENABLE_FEATURE_NAMEIF_EXTENDED
271 /* Check for phy address */
272 memset(ð_settings, 0, sizeof(eth_settings));
273 eth_settings.cmd = ETHTOOL_GSET;
274 ifr.ifr_data = (caddr_t) ð_settings;
275 ioctl(ctl_sk, SIOCETHTOOL, &ifr);
277 /* Check for driver etc. */
278 memset(&drvinfo, 0, sizeof(drvinfo));
279 drvinfo.cmd = ETHTOOL_GDRVINFO;
280 ifr.ifr_data = (caddr_t) &drvinfo;
281 /* Get driver and businfo first, so we have it in drvinfo */
282 ioctl(ctl_sk, SIOCETHTOOL, &ifr);
284 ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
286 /* Search the list for a matching device */
287 for (ch = clist; ch; ch = ch->next) {
288 #if ENABLE_FEATURE_NAMEIF_EXTENDED
289 if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
291 if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
293 if (ch->phy_address != -1 && ch->phy_address != eth_settings.phy_address)
296 if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
298 /* if we came here, all selectors have matched */
301 /* Nothing found for current interface */
304 if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
305 strcpy(ifr.ifr_newname, ch->ifname);
306 ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
307 "can't change ifname %s to %s",
308 ifr.ifr_name, ch->ifname);
310 /* Remove list entry of renamed interface */
311 if (ch->prev != NULL)
312 ch->prev->next = ch->next;
315 if (ch->next != NULL)
316 ch->next->prev = ch->prev;
317 if (ENABLE_FEATURE_CLEAN_UP)
318 delete_eth_table(ch);
321 if (ENABLE_FEATURE_CLEAN_UP) {
323 for (ch = clist; ch; ch = next) {
325 delete_eth_table(ch);
327 config_close(parser);