/* 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; }