busybox/networking/nameif.c

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/* vi: set sw=4 ts=4: */
/*
* nameif.c - Naming Interfaces based on MAC address for busybox.
*
* Written 2000 by Andi Kleen.
* Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
2007-10-14 10:25:59 +05:30
* Glenn McGrath
* Extended matching support 2008 by Nico Erfurth <masta@perlgolf.de>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config NAMEIF
//config: bool "nameif"
//config: default y
//config: select PLATFORM_LINUX
//config: select FEATURE_SYSLOG
//config: help
//config: nameif is used to rename network interface by its MAC address.
//config: Renamed interfaces MUST be in the down state.
//config: It is possible to use a file (default: /etc/mactab)
//config: with list of new interface names and MACs.
//config: Maximum interface name length: IFNAMSIZ = 16
//config: File fields are separated by space or tab.
//config: File format:
//config: # Comment
//config: new_interface_name XX:XX:XX:XX:XX:XX
//config:
//config:config FEATURE_NAMEIF_EXTENDED
//config: bool "Extended nameif"
//config: default y
//config: depends on NAMEIF
//config: help
//config: This extends the nameif syntax to support the bus_info, driver,
//config: phyaddr selectors. The syntax is compatible to the normal nameif.
//config: File format:
//config: new_interface_name driver=asix bus=usb-0000:00:08.2-3
//config: new_interface_name bus=usb-0000:00:08.2-3 00:80:C8:38:91:B5
//config: new_interface_name phy_address=2 00:80:C8:38:91:B5
//config: new_interface_name mac=00:80:C8:38:91:B5
//config: new_interface_name 00:80:C8:38:91:B5
//usage:#define nameif_trivial_usage
//usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
//usage: "[-s] [-c FILE] [IFNAME HWADDR]..."
//usage: )
//usage: IF_FEATURE_NAMEIF_EXTENDED(
//usage: "[-s] [-c FILE] [IFNAME SELECTOR]..."
//usage: )
//usage:#define nameif_full_usage "\n\n"
//usage: "Rename network interface while it in the down state."
//usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
//usage: "\nThe device with address HWADDR is renamed to IFACE."
//usage: )
//usage: IF_FEATURE_NAMEIF_EXTENDED(
//usage: "\nThe device matched by SELECTOR is renamed to IFACE."
//usage: "\nSELECTOR can be a combination of:"
//usage: "\n driver=STRING"
//usage: "\n bus=STRING"
//usage: "\n phy_address=NUM"
//usage: "\n [mac=]XX:XX:XX:XX:XX:XX"
//usage: )
//usage: "\n"
//usage: "\n -c FILE Configuration file (default: /etc/mactab)"
//usage: "\n -s Log to syslog"
//usage:
//usage:#define nameif_example_usage
//usage: "$ nameif -s dmz0 00:A0:C9:8C:F6:3F\n"
//usage: " or\n"
//usage: "$ nameif -c /etc/my_mactab_file\n"
#include "libbb.h"
#include <syslog.h>
#include <net/if.h>
#include <netinet/ether.h>
#include <linux/sockios.h>
#ifndef IFNAMSIZ
#define IFNAMSIZ 16
#endif
/* Taken from linux/sockios.h */
#define SIOCSIFNAME 0x8923 /* set interface name */
/* Octets in one Ethernet addr, from <linux/if_ether.h> */
#define ETH_ALEN 6
#ifndef ifr_newname
#define ifr_newname ifr_ifru.ifru_slave
#endif
typedef struct ethtable_s {
struct ethtable_s *next;
struct ethtable_s *prev;
char *ifname;
struct ether_addr *mac;
#if ENABLE_FEATURE_NAMEIF_EXTENDED
char *bus_info;
char *driver;
int32_t phy_address;
#endif
} ethtable_t;
#if ENABLE_FEATURE_NAMEIF_EXTENDED
/* Cut'n'paste from ethtool.h */
#define ETHTOOL_BUSINFO_LEN 32
/* these strings are set to whatever the driver author decides... */
struct ethtool_drvinfo {
uint32_t cmd;
char driver[32]; /* driver short name, "tulip", "eepro100" */
char version[32]; /* driver version string */
char fw_version[32]; /* firmware version string, if applicable */
char bus_info[ETHTOOL_BUSINFO_LEN]; /* Bus info for this IF. */
/* For PCI devices, use pci_dev->slot_name. */
char reserved1[32];
char reserved2[16];
uint32_t n_stats; /* number of u64's from ETHTOOL_GSTATS */
uint32_t testinfo_len;
uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
uint32_t regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
};
struct ethtool_cmd {
__u32 cmd;
__u32 supported; /* Features this interface supports */
__u32 advertising; /* Features this interface advertises */
__u16 speed; /* The forced speed, 10Mb, 100Mb, gigabit */
__u8 duplex; /* Duplex, half or full */
__u8 port; /* Which connector port */
__u8 phy_address;
__u8 transceiver; /* Which transceiver to use */
__u8 autoneg; /* Enable or disable autonegotiation */
__u32 maxtxpkt; /* Tx pkts before generating tx int */
__u32 maxrxpkt; /* Rx pkts before generating rx int */
__u16 speed_hi;
__u16 reserved2;
__u32 reserved[3];
};
#define ETHTOOL_GSET 0x00000001 /* Get settings. */
#define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
#endif
static void nameif_parse_selector(ethtable_t *ch, char *selector)
{
struct ether_addr *lmac;
#if ENABLE_FEATURE_NAMEIF_EXTENDED
int found_selector = 0;
while (*selector) {
char *next;
#endif
selector = skip_whitespace(selector);
#if ENABLE_FEATURE_NAMEIF_EXTENDED
ch->phy_address = -1;
if (*selector == '\0')
break;
/* Search for the end .... */
next = skip_non_whitespace(selector);
if (*next)
*next++ = '\0';
/* Check for selectors, mac= is assumed */
if (strncmp(selector, "bus=", 4) == 0) {
ch->bus_info = xstrdup(selector + 4);
found_selector++;
} else if (strncmp(selector, "driver=", 7) == 0) {
ch->driver = xstrdup(selector + 7);
found_selector++;
} else if (strncmp(selector, "phyaddr=", 8) == 0) {
ch->phy_address = xatoi_positive(selector + 8);
found_selector++;
} else {
#endif
lmac = xmalloc(ETH_ALEN);
ch->mac = ether_aton_r(selector + (strncmp(selector, "mac=", 4) != 0 ? 0 : 4), lmac);
if (ch->mac == NULL)
bb_error_msg_and_die("can't parse %s", selector);
#if ENABLE_FEATURE_NAMEIF_EXTENDED
found_selector++;
};
selector = next;
}
if (found_selector == 0)
bb_error_msg_and_die("no selectors found for %s", ch->ifname);
#endif
}
static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
{
ethtable_t *ch;
if (strlen(ifname) >= IFNAMSIZ)
bb_error_msg_and_die("interface name '%s' too long", ifname);
ch = xzalloc(sizeof(*ch));
ch->ifname = xstrdup(ifname);
nameif_parse_selector(ch, selector);
ch->next = *clist;
if (*clist)
(*clist)->prev = ch;
*clist = ch;
}
#if ENABLE_FEATURE_CLEAN_UP
static void delete_eth_table(ethtable_t *ch)
{
free(ch->ifname);
#if ENABLE_FEATURE_NAMEIF_EXTENDED
free(ch->bus_info);
free(ch->driver);
#endif
free(ch->mac);
free(ch);
};
#else
void delete_eth_table(ethtable_t *ch);
#endif
int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int nameif_main(int argc UNUSED_PARAM, char **argv)
{
ethtable_t *clist = NULL;
const char *fname = "/etc/mactab";
int ctl_sk;
ethtable_t *ch;
parser_t *parser;
char *token[2];
if (1 & getopt32(argv, "sc:", &fname)) {
2006-10-04 02:30:43 +05:30
openlog(applet_name, 0, LOG_LOCAL0);
/* Why not just "="? I assume logging to stderr
* can't hurt. 2>/dev/null if you don't like it: */
logmode |= LOGMODE_SYSLOG;
}
argv += optind;
if (argv[0]) {
do {
if (!argv[1])
bb_show_usage();
prepend_new_eth_table(&clist, argv[0], argv[1]);
argv += 2;
} while (*argv);
} else {
parser = config_open(fname);
while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL))
prepend_new_eth_table(&clist, token[0], token[1]);
config_close(parser);
}
ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
parser = config_open2("/proc/net/dev", xfopen_for_read);
while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
struct ifreq ifr;
#if ENABLE_FEATURE_NAMEIF_EXTENDED
struct ethtool_drvinfo drvinfo;
struct ethtool_cmd eth_settings;
#endif
if (parser->lineno <= 2)
continue; /* Skip the first two lines */
/* Find the current interface name and copy it to ifr.ifr_name */
memset(&ifr, 0, sizeof(struct ifreq));
strncpy_IFNAMSIZ(ifr.ifr_name, token[0]);
#if ENABLE_FEATURE_NAMEIF_EXTENDED
/* Check for phy address */
memset(&eth_settings, 0, sizeof(eth_settings));
eth_settings.cmd = ETHTOOL_GSET;
ifr.ifr_data = (caddr_t) &eth_settings;
ioctl(ctl_sk, SIOCETHTOOL, &ifr);
/* Check for driver etc. */
memset(&drvinfo, 0, sizeof(drvinfo));
drvinfo.cmd = ETHTOOL_GDRVINFO;
ifr.ifr_data = (caddr_t) &drvinfo;
/* Get driver and businfo first, so we have it in drvinfo */
ioctl(ctl_sk, SIOCETHTOOL, &ifr);
#endif
ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
/* Search the list for a matching device */
for (ch = clist; ch; ch = ch->next) {
#if ENABLE_FEATURE_NAMEIF_EXTENDED
if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
continue;
if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
continue;
if (ch->phy_address != -1 && ch->phy_address != eth_settings.phy_address)
continue;
#endif
if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
continue;
/* if we came here, all selectors have matched */
break;
}
/* Nothing found for current interface */
if (!ch)
continue;
if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
strcpy(ifr.ifr_newname, ch->ifname);
ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
"can't change ifname %s to %s",
ifr.ifr_name, ch->ifname);
}
/* Remove list entry of renamed interface */
if (ch->prev != NULL)
ch->prev->next = ch->next;
else
clist = ch->next;
if (ch->next != NULL)
ch->next->prev = ch->prev;
if (ENABLE_FEATURE_CLEAN_UP)
delete_eth_table(ch);
}
if (ENABLE_FEATURE_CLEAN_UP) {
for (ch = clist; ch; ch = ch->next)
delete_eth_table(ch);
config_close(parser);
};
return 0;
}