1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * nameif.c - Naming Interfaces based on MAC address for busybox.
|
---|
4 | *
|
---|
5 | * Written 2000 by Andi Kleen.
|
---|
6 | * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
|
---|
7 | * Glenn McGrath
|
---|
8 | * Extended matching support 2008 by Nico Erfurth <masta@perlgolf.de>
|
---|
9 | *
|
---|
10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
11 | */
|
---|
12 |
|
---|
13 | //config:config NAMEIF
|
---|
14 | //config: bool "nameif"
|
---|
15 | //config: default y
|
---|
16 | //config: select PLATFORM_LINUX
|
---|
17 | //config: select FEATURE_SYSLOG
|
---|
18 | //config: help
|
---|
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:
|
---|
26 | //config: # Comment
|
---|
27 | //config: new_interface_name XX:XX:XX:XX:XX:XX
|
---|
28 | //config:
|
---|
29 | //config:config FEATURE_NAMEIF_EXTENDED
|
---|
30 | //config: bool "Extended nameif"
|
---|
31 | //config: default y
|
---|
32 | //config: depends on NAMEIF
|
---|
33 | //config: help
|
---|
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
|
---|
42 |
|
---|
43 | //usage:#define nameif_trivial_usage
|
---|
44 | //usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
|
---|
45 | //usage: "[-s] [-c FILE] [IFNAME HWADDR]..."
|
---|
46 | //usage: )
|
---|
47 | //usage: IF_FEATURE_NAMEIF_EXTENDED(
|
---|
48 | //usage: "[-s] [-c FILE] [IFNAME SELECTOR]..."
|
---|
49 | //usage: )
|
---|
50 | //usage:#define nameif_full_usage "\n\n"
|
---|
51 | //usage: "Rename network interface while it in the down state."
|
---|
52 | //usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
|
---|
53 | //usage: "\nThe device with address HWADDR is renamed to IFACE."
|
---|
54 | //usage: )
|
---|
55 | //usage: IF_FEATURE_NAMEIF_EXTENDED(
|
---|
56 | //usage: "\nThe device matched by SELECTOR is renamed to IFACE."
|
---|
57 | //usage: "\nSELECTOR can be a combination of:"
|
---|
58 | //usage: "\n driver=STRING"
|
---|
59 | //usage: "\n bus=STRING"
|
---|
60 | //usage: "\n phy_address=NUM"
|
---|
61 | //usage: "\n [mac=]XX:XX:XX:XX:XX:XX"
|
---|
62 | //usage: )
|
---|
63 | //usage: "\n"
|
---|
64 | //usage: "\n -c FILE Configuration file (default: /etc/mactab)"
|
---|
65 | //usage: "\n -s Log to syslog"
|
---|
66 | //usage:
|
---|
67 | //usage:#define nameif_example_usage
|
---|
68 | //usage: "$ nameif -s dmz0 00:A0:C9:8C:F6:3F\n"
|
---|
69 | //usage: " or\n"
|
---|
70 | //usage: "$ nameif -c /etc/my_mactab_file\n"
|
---|
71 |
|
---|
72 | #include "libbb.h"
|
---|
73 | #include <syslog.h>
|
---|
74 | #include <net/if.h>
|
---|
75 | #include <netinet/ether.h>
|
---|
76 | #include <linux/sockios.h>
|
---|
77 |
|
---|
78 | #ifndef IFNAMSIZ
|
---|
79 | #define IFNAMSIZ 16
|
---|
80 | #endif
|
---|
81 |
|
---|
82 | /* Taken from linux/sockios.h */
|
---|
83 | #define SIOCSIFNAME 0x8923 /* set interface name */
|
---|
84 |
|
---|
85 | /* Octets in one Ethernet addr, from <linux/if_ether.h> */
|
---|
86 | #define ETH_ALEN 6
|
---|
87 |
|
---|
88 | #ifndef ifr_newname
|
---|
89 | #define ifr_newname ifr_ifru.ifru_slave
|
---|
90 | #endif
|
---|
91 |
|
---|
92 | typedef struct ethtable_s {
|
---|
93 | struct ethtable_s *next;
|
---|
94 | struct ethtable_s *prev;
|
---|
95 | char *ifname;
|
---|
96 | struct ether_addr *mac;
|
---|
97 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
98 | char *bus_info;
|
---|
99 | char *driver;
|
---|
100 | int32_t phy_address;
|
---|
101 | #endif
|
---|
102 | } ethtable_t;
|
---|
103 |
|
---|
104 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
105 | /* Cut'n'paste from ethtool.h */
|
---|
106 | #define ETHTOOL_BUSINFO_LEN 32
|
---|
107 | /* these strings are set to whatever the driver author decides... */
|
---|
108 | struct ethtool_drvinfo {
|
---|
109 | uint32_t cmd;
|
---|
110 | char driver[32]; /* driver short name, "tulip", "eepro100" */
|
---|
111 | char version[32]; /* driver version string */
|
---|
112 | char fw_version[32]; /* firmware version string, if applicable */
|
---|
113 | char bus_info[ETHTOOL_BUSINFO_LEN]; /* Bus info for this IF. */
|
---|
114 | /* For PCI devices, use pci_dev->slot_name. */
|
---|
115 | char reserved1[32];
|
---|
116 | char reserved2[16];
|
---|
117 | uint32_t n_stats; /* number of u64's from ETHTOOL_GSTATS */
|
---|
118 | uint32_t testinfo_len;
|
---|
119 | uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
|
---|
120 | uint32_t regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
|
---|
121 | };
|
---|
122 |
|
---|
123 | struct ethtool_cmd {
|
---|
124 | uint32_t cmd;
|
---|
125 | uint32_t supported; /* Features this interface supports */
|
---|
126 | uint32_t advertising; /* Features this interface advertises */
|
---|
127 | uint16_t speed; /* The forced speed, 10Mb, 100Mb, gigabit */
|
---|
128 | uint8_t duplex; /* Duplex, half or full */
|
---|
129 | uint8_t port; /* Which connector port */
|
---|
130 | uint8_t phy_address;
|
---|
131 | uint8_t transceiver; /* Which transceiver to use */
|
---|
132 | uint8_t autoneg; /* Enable or disable autonegotiation */
|
---|
133 | uint32_t maxtxpkt; /* Tx pkts before generating tx int */
|
---|
134 | uint32_t maxrxpkt; /* Rx pkts before generating rx int */
|
---|
135 | uint16_t speed_hi;
|
---|
136 | uint16_t reserved2;
|
---|
137 | uint32_t reserved[3];
|
---|
138 | };
|
---|
139 |
|
---|
140 | #define ETHTOOL_GSET 0x00000001 /* Get settings. */
|
---|
141 | #define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
|
---|
142 | #endif
|
---|
143 |
|
---|
144 |
|
---|
145 | static void nameif_parse_selector(ethtable_t *ch, char *selector)
|
---|
146 | {
|
---|
147 | struct ether_addr *lmac;
|
---|
148 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
149 | int found_selector = 0;
|
---|
150 |
|
---|
151 | while (*selector) {
|
---|
152 | char *next;
|
---|
153 | #endif
|
---|
154 | selector = skip_whitespace(selector);
|
---|
155 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
156 | ch->phy_address = -1;
|
---|
157 | if (*selector == '\0')
|
---|
158 | break;
|
---|
159 | /* Search for the end .... */
|
---|
160 | next = skip_non_whitespace(selector);
|
---|
161 | if (*next)
|
---|
162 | *next++ = '\0';
|
---|
163 | /* Check for selectors, mac= is assumed */
|
---|
164 | if (strncmp(selector, "bus=", 4) == 0) {
|
---|
165 | ch->bus_info = xstrdup(selector + 4);
|
---|
166 | found_selector++;
|
---|
167 | } else if (strncmp(selector, "driver=", 7) == 0) {
|
---|
168 | ch->driver = xstrdup(selector + 7);
|
---|
169 | found_selector++;
|
---|
170 | } else if (strncmp(selector, "phyaddr=", 8) == 0) {
|
---|
171 | ch->phy_address = xatoi_positive(selector + 8);
|
---|
172 | found_selector++;
|
---|
173 | } else {
|
---|
174 | #endif
|
---|
175 | lmac = xmalloc(ETH_ALEN);
|
---|
176 | ch->mac = ether_aton_r(selector + (strncmp(selector, "mac=", 4) != 0 ? 0 : 4), lmac);
|
---|
177 | if (ch->mac == NULL)
|
---|
178 | bb_error_msg_and_die("can't parse %s", selector);
|
---|
179 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
180 | found_selector++;
|
---|
181 | };
|
---|
182 | selector = next;
|
---|
183 | }
|
---|
184 | if (found_selector == 0)
|
---|
185 | bb_error_msg_and_die("no selectors found for %s", ch->ifname);
|
---|
186 | #endif
|
---|
187 | }
|
---|
188 |
|
---|
189 | static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
|
---|
190 | {
|
---|
191 | ethtable_t *ch;
|
---|
192 | if (strlen(ifname) >= IFNAMSIZ)
|
---|
193 | bb_error_msg_and_die("interface name '%s' too long", ifname);
|
---|
194 | ch = xzalloc(sizeof(*ch));
|
---|
195 | ch->ifname = xstrdup(ifname);
|
---|
196 | nameif_parse_selector(ch, selector);
|
---|
197 | ch->next = *clist;
|
---|
198 | if (*clist)
|
---|
199 | (*clist)->prev = ch;
|
---|
200 | *clist = ch;
|
---|
201 | }
|
---|
202 |
|
---|
203 | #if ENABLE_FEATURE_CLEAN_UP
|
---|
204 | static void delete_eth_table(ethtable_t *ch)
|
---|
205 | {
|
---|
206 | free(ch->ifname);
|
---|
207 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
208 | free(ch->bus_info);
|
---|
209 | free(ch->driver);
|
---|
210 | #endif
|
---|
211 | free(ch->mac);
|
---|
212 | free(ch);
|
---|
213 | };
|
---|
214 | #else
|
---|
215 | void delete_eth_table(ethtable_t *ch);
|
---|
216 | #endif
|
---|
217 |
|
---|
218 | int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
219 | int nameif_main(int argc UNUSED_PARAM, char **argv)
|
---|
220 | {
|
---|
221 | ethtable_t *clist = NULL;
|
---|
222 | const char *fname = "/etc/mactab";
|
---|
223 | int ctl_sk;
|
---|
224 | ethtable_t *ch;
|
---|
225 | parser_t *parser;
|
---|
226 | char *token[2];
|
---|
227 |
|
---|
228 | if (1 & getopt32(argv, "sc:", &fname)) {
|
---|
229 | openlog(applet_name, 0, LOG_LOCAL0);
|
---|
230 | /* Why not just "="? I assume logging to stderr
|
---|
231 | * can't hurt. 2>/dev/null if you don't like it: */
|
---|
232 | logmode |= LOGMODE_SYSLOG;
|
---|
233 | }
|
---|
234 | argv += optind;
|
---|
235 |
|
---|
236 | if (argv[0]) {
|
---|
237 | do {
|
---|
238 | if (!argv[1])
|
---|
239 | bb_show_usage();
|
---|
240 | prepend_new_eth_table(&clist, argv[0], argv[1]);
|
---|
241 | argv += 2;
|
---|
242 | } while (*argv);
|
---|
243 | } else {
|
---|
244 | parser = config_open(fname);
|
---|
245 | while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL))
|
---|
246 | prepend_new_eth_table(&clist, token[0], token[1]);
|
---|
247 | config_close(parser);
|
---|
248 | }
|
---|
249 |
|
---|
250 | ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
|
---|
251 | parser = config_open2("/proc/net/dev", xfopen_for_read);
|
---|
252 |
|
---|
253 | while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
|
---|
254 | struct ifreq ifr;
|
---|
255 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
256 | struct ethtool_drvinfo drvinfo;
|
---|
257 | struct ethtool_cmd eth_settings;
|
---|
258 | #endif
|
---|
259 | if (parser->lineno <= 2)
|
---|
260 | continue; /* Skip the first two lines */
|
---|
261 |
|
---|
262 | /* Find the current interface name and copy it to ifr.ifr_name */
|
---|
263 | memset(&ifr, 0, sizeof(struct ifreq));
|
---|
264 | strncpy_IFNAMSIZ(ifr.ifr_name, token[0]);
|
---|
265 |
|
---|
266 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
267 | /* Check for phy address */
|
---|
268 | memset(ð_settings, 0, sizeof(eth_settings));
|
---|
269 | eth_settings.cmd = ETHTOOL_GSET;
|
---|
270 | ifr.ifr_data = (caddr_t) ð_settings;
|
---|
271 | ioctl(ctl_sk, SIOCETHTOOL, &ifr);
|
---|
272 |
|
---|
273 | /* Check for driver etc. */
|
---|
274 | memset(&drvinfo, 0, sizeof(drvinfo));
|
---|
275 | drvinfo.cmd = ETHTOOL_GDRVINFO;
|
---|
276 | ifr.ifr_data = (caddr_t) &drvinfo;
|
---|
277 | /* Get driver and businfo first, so we have it in drvinfo */
|
---|
278 | ioctl(ctl_sk, SIOCETHTOOL, &ifr);
|
---|
279 | #endif
|
---|
280 | ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
|
---|
281 |
|
---|
282 | /* Search the list for a matching device */
|
---|
283 | for (ch = clist; ch; ch = ch->next) {
|
---|
284 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
|
---|
285 | if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
|
---|
286 | continue;
|
---|
287 | if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
|
---|
288 | continue;
|
---|
289 | if (ch->phy_address != -1 && ch->phy_address != eth_settings.phy_address)
|
---|
290 | continue;
|
---|
291 | #endif
|
---|
292 | if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
|
---|
293 | continue;
|
---|
294 | /* if we came here, all selectors have matched */
|
---|
295 | break;
|
---|
296 | }
|
---|
297 | /* Nothing found for current interface */
|
---|
298 | if (!ch)
|
---|
299 | continue;
|
---|
300 |
|
---|
301 | if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
|
---|
302 | strcpy(ifr.ifr_newname, ch->ifname);
|
---|
303 | ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
|
---|
304 | "can't change ifname %s to %s",
|
---|
305 | ifr.ifr_name, ch->ifname);
|
---|
306 | }
|
---|
307 | /* Remove list entry of renamed interface */
|
---|
308 | if (ch->prev != NULL)
|
---|
309 | ch->prev->next = ch->next;
|
---|
310 | else
|
---|
311 | clist = ch->next;
|
---|
312 | if (ch->next != NULL)
|
---|
313 | ch->next->prev = ch->prev;
|
---|
314 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
315 | delete_eth_table(ch);
|
---|
316 | }
|
---|
317 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
318 | for (ch = clist; ch; ch = ch->next)
|
---|
319 | delete_eth_table(ch);
|
---|
320 | config_close(parser);
|
---|
321 | };
|
---|
322 |
|
---|
323 | return 0;
|
---|
324 | }
|
---|