diff options
Diffstat (limited to 'networking/nameif.c')
| -rw-r--r-- | networking/nameif.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/networking/nameif.c b/networking/nameif.c new file mode 100644 index 0000000..75829fa --- /dev/null +++ b/networking/nameif.c @@ -0,0 +1,232 @@ +/* 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 the GPL v2 or later, see the file LICENSE in this tarball. + */ + +#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; +#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) */ +}; +#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 + 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 { +#endif + lmac = xmalloc(ETH_ALEN); + ch->mac = ether_aton_r(selector + (strncmp(selector, "mac=", 4) ? 0 : 4), lmac); + if (ch->mac == NULL) + bb_error_msg_and_die("cannot 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, 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); + logmode = LOGMODE_SYSLOG; + } + argc -= optind; + argv += optind; + + if (argc & 1) + bb_show_usage(); + + if (argc) { + while (*argv) { + char *ifname = xstrdup(*argv++); + prepend_new_eth_table(&clist, ifname, *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; +#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(ifr.ifr_name, token[0], sizeof(ifr.ifr_name)); + +#if ENABLE_FEATURE_NAMEIF_EXTENDED + /* Check for driver etc. */ + memset(&drvinfo, 0, sizeof(struct ethtool_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; +#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, + "cannot 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; +} |