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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>
- * 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 {
- uint32_t cmd;
- uint32_t supported; /* Features this interface supports */
- uint32_t advertising; /* Features this interface advertises */
- uint16_t speed; /* The forced speed, 10Mb, 100Mb, gigabit */
- uint8_t duplex; /* Duplex, half or full */
- uint8_t port; /* Which connector port */
- uint8_t phy_address;
- uint8_t transceiver; /* Which transceiver to use */
- uint8_t autoneg; /* Enable or disable autonegotiation */
- uint32_t maxtxpkt; /* Tx pkts before generating tx int */
- uint32_t maxrxpkt; /* Rx pkts before generating rx int */
- uint16_t speed_hi;
- uint16_t reserved2;
- uint32_t 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)) {
- 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(ð_settings, 0, sizeof(eth_settings));
- eth_settings.cmd = ETHTOOL_GSET;
- ifr.ifr_data = (caddr_t) ð_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 */
- goto found;
- }
- /* Nothing found for current interface */
- continue;
- found:
- 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);
- } /* while */
- if (ENABLE_FEATURE_CLEAN_UP) {
- ethtable_t *next;
- for (ch = clist; ch; ch = next) {
- next = ch->next;
- delete_eth_table(ch);
- }
- config_close(parser);
- };
- return 0;
- }
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