| /* 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 (is_prefixed_with(selector, "bus=")) { |
| ch->bus_info = xstrdup(selector + 4); |
| found_selector++; |
| } else if (is_prefixed_with(selector, "driver=")) { |
| ch->driver = xstrdup(selector + 7); |
| found_selector++; |
| } else if (is_prefixed_with(selector, "phyaddr=")) { |
| ch->phy_address = xatoi_positive(selector + 8); |
| found_selector++; |
| } else { |
| #endif |
| lmac = xmalloc(ETH_ALEN); |
| ch->mac = ether_aton_r(selector + (is_prefixed_with(selector, "mac=") ? 4 : 0), 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; |
| } |