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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//applet:IF_NAMEIF(APPLET(nameif, BB_DIR_SBIN, BB_SUID_DROP))
44
45//kbuild:lib-$(CONFIG_NAMEIF) += nameif.o
46
47//usage:#define nameif_trivial_usage
48//usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
49//usage: "[-s] [-c FILE] [IFNAME HWADDR]..."
50//usage: )
51//usage: IF_FEATURE_NAMEIF_EXTENDED(
52//usage: "[-s] [-c FILE] [IFNAME SELECTOR]..."
53//usage: )
54//usage:#define nameif_full_usage "\n\n"
55//usage: "Rename network interface while it in the down state."
56//usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
57//usage: "\nThe device with address HWADDR is renamed to IFACE."
58//usage: )
59//usage: IF_FEATURE_NAMEIF_EXTENDED(
60//usage: "\nThe device matched by SELECTOR is renamed to IFACE."
61//usage: "\nSELECTOR can be a combination of:"
62//usage: "\n driver=STRING"
63//usage: "\n bus=STRING"
64//usage: "\n phy_address=NUM"
65//usage: "\n [mac=]XX:XX:XX:XX:XX:XX"
66//usage: )
67//usage: "\n"
68//usage: "\n -c FILE Configuration file (default: /etc/mactab)"
69//usage: "\n -s Log to syslog"
70//usage:
71//usage:#define nameif_example_usage
72//usage: "$ nameif -s dmz0 00:A0:C9:8C:F6:3F\n"
73//usage: " or\n"
74//usage: "$ nameif -c /etc/my_mactab_file\n"
75
76#include "libbb.h"
77#include <syslog.h>
78#include <net/if.h>
79#include <netinet/ether.h>
80#include <linux/sockios.h>
81
82#ifndef IFNAMSIZ
83#define IFNAMSIZ 16
84#endif
85
86/* Taken from linux/sockios.h */
87#define SIOCSIFNAME 0x8923 /* set interface name */
88
89/* Octets in one Ethernet addr, from <linux/if_ether.h> */
90#define ETH_ALEN 6
91
92#ifndef ifr_newname
93#define ifr_newname ifr_ifru.ifru_slave
94#endif
95
96typedef struct ethtable_s {
97 struct ethtable_s *next;
98 struct ethtable_s *prev;
99 char *ifname;
100 struct ether_addr *mac;
101#if ENABLE_FEATURE_NAMEIF_EXTENDED
102 char *bus_info;
103 char *driver;
104 int32_t phy_address;
105#endif
106} ethtable_t;
107
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... */
112struct ethtool_drvinfo {
113 uint32_t cmd;
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. */
119 char reserved1[32];
120 char reserved2[16];
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) */
125};
126
127struct ethtool_cmd {
128 uint32_t cmd;
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 */
134 uint8_t phy_address;
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 */
139 uint16_t speed_hi;
140 uint16_t reserved2;
141 uint32_t reserved[3];
142};
143
144#define ETHTOOL_GSET 0x00000001 /* Get settings. */
145#define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
146#endif
147
148
149static void nameif_parse_selector(ethtable_t *ch, char *selector)
150{
151 struct ether_addr *lmac;
152#if ENABLE_FEATURE_NAMEIF_EXTENDED
153 int found_selector = 0;
154
155 while (*selector) {
156 char *next;
157#endif
158 selector = skip_whitespace(selector);
159#if ENABLE_FEATURE_NAMEIF_EXTENDED
160 ch->phy_address = -1;
161 if (*selector == '\0')
162 break;
163 /* Search for the end .... */
164 next = skip_non_whitespace(selector);
165 if (*next)
166 *next++ = '\0';
167 /* Check for selectors, mac= is assumed */
168 if (is_prefixed_with(selector, "bus=")) {
169 ch->bus_info = xstrdup(selector + 4);
170 found_selector++;
171 } else if (is_prefixed_with(selector, "driver=")) {
172 ch->driver = xstrdup(selector + 7);
173 found_selector++;
174 } else if (is_prefixed_with(selector, "phyaddr=")) {
175 ch->phy_address = xatoi_positive(selector + 8);
176 found_selector++;
177 } else {
178#endif
179 lmac = xmalloc(ETH_ALEN);
180 ch->mac = ether_aton_r(selector + (is_prefixed_with(selector, "mac=") ? 4 : 0), lmac);
181 if (ch->mac == NULL)
182 bb_error_msg_and_die("can't parse %s", selector);
183#if ENABLE_FEATURE_NAMEIF_EXTENDED
184 found_selector++;
185 };
186 selector = next;
187 }
188 if (found_selector == 0)
189 bb_error_msg_and_die("no selectors found for %s", ch->ifname);
190#endif
191}
192
193static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
194{
195 ethtable_t *ch;
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);
201 ch->next = *clist;
202 if (*clist)
203 (*clist)->prev = ch;
204 *clist = ch;
205}
206
207#if ENABLE_FEATURE_CLEAN_UP
208static void delete_eth_table(ethtable_t *ch)
209{
210 free(ch->ifname);
211#if ENABLE_FEATURE_NAMEIF_EXTENDED
212 free(ch->bus_info);
213 free(ch->driver);
214#endif
215 free(ch->mac);
216 free(ch);
217};
218#else
219void delete_eth_table(ethtable_t *ch);
220#endif
221
222int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
223int nameif_main(int argc UNUSED_PARAM, char **argv)
224{
225 ethtable_t *clist = NULL;
226 const char *fname = "/etc/mactab";
227 int ctl_sk;
228 ethtable_t *ch;
229 parser_t *parser;
230 char *token[2];
231
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;
237 }
238 argv += optind;
239
240 if (argv[0]) {
241 do {
242 if (!argv[1])
243 bb_show_usage();
244 prepend_new_eth_table(&clist, argv[0], argv[1]);
245 argv += 2;
246 } while (*argv);
247 } else {
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);
252 }
253
254 ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
255 parser = config_open2("/proc/net/dev", xfopen_for_read);
256
257 while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
258 struct ifreq ifr;
259#if ENABLE_FEATURE_NAMEIF_EXTENDED
260 struct ethtool_drvinfo drvinfo;
261 struct ethtool_cmd eth_settings;
262#endif
263 if (parser->lineno <= 2)
264 continue; /* Skip the first two lines */
265
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]);
269
270#if ENABLE_FEATURE_NAMEIF_EXTENDED
271 /* Check for phy address */
272 memset(&eth_settings, 0, sizeof(eth_settings));
273 eth_settings.cmd = ETHTOOL_GSET;
274 ifr.ifr_data = (caddr_t) &eth_settings;
275 ioctl(ctl_sk, SIOCETHTOOL, &ifr);
276
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);
283#endif
284 ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
285
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)
290 continue;
291 if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
292 continue;
293 if (ch->phy_address != -1 && ch->phy_address != eth_settings.phy_address)
294 continue;
295#endif
296 if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
297 continue;
298 /* if we came here, all selectors have matched */
299 goto found;
300 }
301 /* Nothing found for current interface */
302 continue;
303 found:
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);
309 }
310 /* Remove list entry of renamed interface */
311 if (ch->prev != NULL)
312 ch->prev->next = ch->next;
313 else
314 clist = ch->next;
315 if (ch->next != NULL)
316 ch->next->prev = ch->prev;
317 if (ENABLE_FEATURE_CLEAN_UP)
318 delete_eth_table(ch);
319 } /* while */
320
321 if (ENABLE_FEATURE_CLEAN_UP) {
322 ethtable_t *next;
323 for (ch = clist; ch; ch = next) {
324 next = ch->next;
325 delete_eth_table(ch);
326 }
327 config_close(parser);
328 };
329
330 return 0;
331}
332
generated by cgit at 2024-05-15 20:40:20 (GMT)