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 the GPL v2 or later, see the file LICENSE in this tarball.
16 #include <netinet/ether.h>
17 #include <linux/sockios.h>
23 /* Taken from linux/sockios.h */
24 #define SIOCSIFNAME 0x8923 /* set interface name */
26 /* Octets in one Ethernet addr, from <linux/if_ether.h> */
30 #define ifr_newname ifr_ifru.ifru_slave
33 typedef struct ethtable_s
{
34 struct ethtable_s
*next
;
35 struct ethtable_s
*prev
;
37 struct ether_addr
*mac
;
38 #if ENABLE_FEATURE_NAMEIF_EXTENDED
44 #if ENABLE_FEATURE_NAMEIF_EXTENDED
45 /* Cut'n'paste from ethtool.h */
46 #define ETHTOOL_BUSINFO_LEN 32
47 /* these strings are set to whatever the driver author decides... */
48 struct ethtool_drvinfo
{
50 char driver
[32]; /* driver short name, "tulip", "eepro100" */
51 char version
[32]; /* driver version string */
52 char fw_version
[32]; /* firmware version string, if applicable */
53 char bus_info
[ETHTOOL_BUSINFO_LEN
]; /* Bus info for this IF. */
54 /* For PCI devices, use pci_dev->slot_name. */
57 uint32_t n_stats
; /* number of u64's from ETHTOOL_GSTATS */
58 uint32_t testinfo_len
;
59 uint32_t eedump_len
; /* Size of data from ETHTOOL_GEEPROM (bytes) */
60 uint32_t regdump_len
; /* Size of data from ETHTOOL_GREGS (bytes) */
62 #define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
66 static void nameif_parse_selector(ethtable_t
*ch
, char *selector
)
68 struct ether_addr
*lmac
;
69 #if ENABLE_FEATURE_NAMEIF_EXTENDED
70 int found_selector
= 0;
75 selector
= skip_whitespace(selector
);
76 #if ENABLE_FEATURE_NAMEIF_EXTENDED
77 if (*selector
== '\0')
79 /* Search for the end .... */
80 next
= skip_non_whitespace(selector
);
83 /* Check for selectors, mac= is assumed */
84 if (strncmp(selector
, "bus=", 4) == 0) {
85 ch
->bus_info
= xstrdup(selector
+ 4);
87 } else if (strncmp(selector
, "driver=", 7) == 0) {
88 ch
->driver
= xstrdup(selector
+ 7);
92 lmac
= xmalloc(ETH_ALEN
);
93 ch
->mac
= ether_aton_r(selector
+ (strncmp(selector
, "mac=", 4) ? 0 : 4), lmac
);
95 bb_error_msg_and_die("cannot parse %s", selector
);
96 #if ENABLE_FEATURE_NAMEIF_EXTENDED
101 if (found_selector
== 0)
102 bb_error_msg_and_die("no selectors found for %s", ch
->ifname
);
106 static void prepend_new_eth_table(ethtable_t
**clist
, char *ifname
, char *selector
)
109 if (strlen(ifname
) >= IFNAMSIZ
)
110 bb_error_msg_and_die("interface name '%s' too long", ifname
);
111 ch
= xzalloc(sizeof(*ch
));
112 ch
->ifname
= xstrdup(ifname
);
113 nameif_parse_selector(ch
, selector
);
120 #if ENABLE_FEATURE_CLEAN_UP
121 static void delete_eth_table(ethtable_t
*ch
)
124 #if ENABLE_FEATURE_NAMEIF_EXTENDED
132 void delete_eth_table(ethtable_t
*ch
);
135 int nameif_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
136 int nameif_main(int argc
, char **argv
)
138 ethtable_t
*clist
= NULL
;
139 const char *fname
= "/etc/mactab";
145 if (1 & getopt32(argv
, "sc:", &fname
)) {
146 openlog(applet_name
, 0, LOG_LOCAL0
);
147 /* Why not just "="? I assume logging to stderr
148 * can't hurt. 2>/dev/null if you don't like it: */
149 logmode
|= LOGMODE_SYSLOG
;
159 char *ifname
= xstrdup(*argv
++);
160 prepend_new_eth_table(&clist
, ifname
, *argv
++);
163 parser
= config_open(fname
);
164 while (config_read(parser
, token
, 2, 2, "# \t", PARSE_NORMAL
))
165 prepend_new_eth_table(&clist
, token
[0], token
[1]);
166 config_close(parser
);
169 ctl_sk
= xsocket(PF_INET
, SOCK_DGRAM
, 0);
170 parser
= config_open2("/proc/net/dev", xfopen_for_read
);
172 while (clist
&& config_read(parser
, token
, 2, 2, "\0: \t", PARSE_NORMAL
)) {
174 #if ENABLE_FEATURE_NAMEIF_EXTENDED
175 struct ethtool_drvinfo drvinfo
;
177 if (parser
->lineno
< 2)
178 continue; /* Skip the first two lines */
180 /* Find the current interface name and copy it to ifr.ifr_name */
181 memset(&ifr
, 0, sizeof(struct ifreq
));
182 strncpy_IFNAMSIZ(ifr
.ifr_name
, token
[0]);
184 #if ENABLE_FEATURE_NAMEIF_EXTENDED
185 /* Check for driver etc. */
186 memset(&drvinfo
, 0, sizeof(struct ethtool_drvinfo
));
187 drvinfo
.cmd
= ETHTOOL_GDRVINFO
;
188 ifr
.ifr_data
= (caddr_t
) &drvinfo
;
189 /* Get driver and businfo first, so we have it in drvinfo */
190 ioctl(ctl_sk
, SIOCETHTOOL
, &ifr
);
192 ioctl(ctl_sk
, SIOCGIFHWADDR
, &ifr
);
194 /* Search the list for a matching device */
195 for (ch
= clist
; ch
; ch
= ch
->next
) {
196 #if ENABLE_FEATURE_NAMEIF_EXTENDED
197 if (ch
->bus_info
&& strcmp(ch
->bus_info
, drvinfo
.bus_info
) != 0)
199 if (ch
->driver
&& strcmp(ch
->driver
, drvinfo
.driver
) != 0)
202 if (ch
->mac
&& memcmp(ch
->mac
, ifr
.ifr_hwaddr
.sa_data
, ETH_ALEN
) != 0)
204 /* if we came here, all selectors have matched */
207 /* Nothing found for current interface */
211 if (strcmp(ifr
.ifr_name
, ch
->ifname
) != 0) {
212 strcpy(ifr
.ifr_newname
, ch
->ifname
);
213 ioctl_or_perror_and_die(ctl_sk
, SIOCSIFNAME
, &ifr
,
214 "cannot change ifname %s to %s",
215 ifr
.ifr_name
, ch
->ifname
);
217 /* Remove list entry of renamed interface */
218 if (ch
->prev
!= NULL
)
219 ch
->prev
->next
= ch
->next
;
222 if (ch
->next
!= NULL
)
223 ch
->next
->prev
= ch
->prev
;
224 if (ENABLE_FEATURE_CLEAN_UP
)
225 delete_eth_table(ch
);
227 if (ENABLE_FEATURE_CLEAN_UP
) {
228 for (ch
= clist
; ch
; ch
= ch
->next
)
229 delete_eth_table(ch
);
230 config_close(parser
);