| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * nameif.c - Naming Interfaces based on MAC address for busybox.
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| 4 | *
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| 5 | * Written 2000 by Andi Kleen.
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| 6 | * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
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| 7 | * Glenn McGrath
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| 8 | * Extended matching support 2008 by Nico Erfurth <masta@perlgolf.de>
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 11 | */
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| 12 |
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| 13 | //config:config NAMEIF
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| 14 | //config: bool "nameif"
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| 15 | //config: default y
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| 16 | //config: select PLATFORM_LINUX
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| 17 | //config: select FEATURE_SYSLOG
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| 18 | //config: help
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| 19 | //config: nameif is used to rename network interface by its MAC address.
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| 20 | //config: Renamed interfaces MUST be in the down state.
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| 21 | //config: It is possible to use a file (default: /etc/mactab)
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| 22 | //config: with list of new interface names and MACs.
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| 23 | //config: Maximum interface name length: IFNAMSIZ = 16
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| 24 | //config: File fields are separated by space or tab.
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| 25 | //config: File format:
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| 26 | //config: # Comment
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| 27 | //config: new_interface_name XX:XX:XX:XX:XX:XX
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| 28 | //config:
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| 29 | //config:config FEATURE_NAMEIF_EXTENDED
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| 30 | //config: bool "Extended nameif"
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| 31 | //config: default y
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| 32 | //config: depends on NAMEIF
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| 33 | //config: help
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| 34 | //config: This extends the nameif syntax to support the bus_info, driver,
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| 35 | //config: phyaddr selectors. The syntax is compatible to the normal nameif.
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| 36 | //config: File format:
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| 37 | //config: new_interface_name driver=asix bus=usb-0000:00:08.2-3
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| 38 | //config: new_interface_name bus=usb-0000:00:08.2-3 00:80:C8:38:91:B5
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| 39 | //config: new_interface_name phy_address=2 00:80:C8:38:91:B5
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| 40 | //config: new_interface_name mac=00:80:C8:38:91:B5
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| 41 | //config: new_interface_name 00:80:C8:38:91:B5
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| 42 |
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| 43 | //usage:#define nameif_trivial_usage
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| 44 | //usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
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| 45 | //usage: "[-s] [-c FILE] [IFNAME HWADDR]..."
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| 46 | //usage: )
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| 47 | //usage: IF_FEATURE_NAMEIF_EXTENDED(
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| 48 | //usage: "[-s] [-c FILE] [IFNAME SELECTOR]..."
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| 49 | //usage: )
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| 50 | //usage:#define nameif_full_usage "\n\n"
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| 51 | //usage: "Rename network interface while it in the down state."
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| 52 | //usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
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| 53 | //usage: "\nThe device with address HWADDR is renamed to IFACE."
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| 54 | //usage: )
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| 55 | //usage: IF_FEATURE_NAMEIF_EXTENDED(
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| 56 | //usage: "\nThe device matched by SELECTOR is renamed to IFACE."
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| 57 | //usage: "\nSELECTOR can be a combination of:"
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| 58 | //usage: "\n driver=STRING"
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| 59 | //usage: "\n bus=STRING"
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| 60 | //usage: "\n phy_address=NUM"
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| 61 | //usage: "\n [mac=]XX:XX:XX:XX:XX:XX"
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| 62 | //usage: )
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| 63 | //usage: "\n"
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| 64 | //usage: "\n -c FILE Configuration file (default: /etc/mactab)"
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| 65 | //usage: "\n -s Log to syslog"
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| 66 | //usage:
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| 67 | //usage:#define nameif_example_usage
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| 68 | //usage: "$ nameif -s dmz0 00:A0:C9:8C:F6:3F\n"
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| 69 | //usage: " or\n"
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| 70 | //usage: "$ nameif -c /etc/my_mactab_file\n"
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| 71 |
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| 72 | #include "libbb.h"
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| 73 | #include <syslog.h>
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| 74 | #include <net/if.h>
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| 75 | #include <netinet/ether.h>
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| 76 | #include <linux/sockios.h>
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| 77 |
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| 78 | #ifndef IFNAMSIZ
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| 79 | #define IFNAMSIZ 16
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| 80 | #endif
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| 81 |
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| 82 | /* Taken from linux/sockios.h */
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| 83 | #define SIOCSIFNAME 0x8923 /* set interface name */
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| 84 |
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| 85 | /* Octets in one Ethernet addr, from <linux/if_ether.h> */
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| 86 | #define ETH_ALEN 6
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| 87 |
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| 88 | #ifndef ifr_newname
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| 89 | #define ifr_newname ifr_ifru.ifru_slave
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| 90 | #endif
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| 91 |
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| 92 | typedef struct ethtable_s {
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| 93 | struct ethtable_s *next;
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| 94 | struct ethtable_s *prev;
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| 95 | char *ifname;
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| 96 | struct ether_addr *mac;
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| 97 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 98 | char *bus_info;
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| 99 | char *driver;
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| 100 | int32_t phy_address;
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| 101 | #endif
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| 102 | } ethtable_t;
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| 103 |
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| 104 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 105 | /* Cut'n'paste from ethtool.h */
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| 106 | #define ETHTOOL_BUSINFO_LEN 32
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| 107 | /* these strings are set to whatever the driver author decides... */
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| 108 | struct ethtool_drvinfo {
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| 109 | uint32_t cmd;
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| 110 | char driver[32]; /* driver short name, "tulip", "eepro100" */
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| 111 | char version[32]; /* driver version string */
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| 112 | char fw_version[32]; /* firmware version string, if applicable */
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| 113 | char bus_info[ETHTOOL_BUSINFO_LEN]; /* Bus info for this IF. */
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| 114 | /* For PCI devices, use pci_dev->slot_name. */
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| 115 | char reserved1[32];
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| 116 | char reserved2[16];
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| 117 | uint32_t n_stats; /* number of u64's from ETHTOOL_GSTATS */
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| 118 | uint32_t testinfo_len;
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| 119 | uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
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| 120 | uint32_t regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
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| 121 | };
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| 122 |
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| 123 | struct ethtool_cmd {
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| 124 | uint32_t cmd;
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| 125 | uint32_t supported; /* Features this interface supports */
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| 126 | uint32_t advertising; /* Features this interface advertises */
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| 127 | uint16_t speed; /* The forced speed, 10Mb, 100Mb, gigabit */
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| 128 | uint8_t duplex; /* Duplex, half or full */
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| 129 | uint8_t port; /* Which connector port */
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| 130 | uint8_t phy_address;
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| 131 | uint8_t transceiver; /* Which transceiver to use */
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| 132 | uint8_t autoneg; /* Enable or disable autonegotiation */
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| 133 | uint32_t maxtxpkt; /* Tx pkts before generating tx int */
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| 134 | uint32_t maxrxpkt; /* Rx pkts before generating rx int */
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| 135 | uint16_t speed_hi;
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| 136 | uint16_t reserved2;
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| 137 | uint32_t reserved[3];
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| 138 | };
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| 139 |
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| 140 | #define ETHTOOL_GSET 0x00000001 /* Get settings. */
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| 141 | #define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
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| 142 | #endif
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| 143 |
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| 144 |
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| 145 | static void nameif_parse_selector(ethtable_t *ch, char *selector)
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| 146 | {
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| 147 | struct ether_addr *lmac;
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| 148 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 149 | int found_selector = 0;
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| 150 |
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| 151 | while (*selector) {
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| 152 | char *next;
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| 153 | #endif
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| 154 | selector = skip_whitespace(selector);
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| 155 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 156 | ch->phy_address = -1;
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| 157 | if (*selector == '\0')
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| 158 | break;
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| 159 | /* Search for the end .... */
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| 160 | next = skip_non_whitespace(selector);
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| 161 | if (*next)
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| 162 | *next++ = '\0';
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| 163 | /* Check for selectors, mac= is assumed */
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| 164 | if (strncmp(selector, "bus=", 4) == 0) {
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| 165 | ch->bus_info = xstrdup(selector + 4);
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| 166 | found_selector++;
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| 167 | } else if (strncmp(selector, "driver=", 7) == 0) {
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| 168 | ch->driver = xstrdup(selector + 7);
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| 169 | found_selector++;
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| 170 | } else if (strncmp(selector, "phyaddr=", 8) == 0) {
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| 171 | ch->phy_address = xatoi_positive(selector + 8);
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| 172 | found_selector++;
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| 173 | } else {
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| 174 | #endif
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| 175 | lmac = xmalloc(ETH_ALEN);
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| 176 | ch->mac = ether_aton_r(selector + (strncmp(selector, "mac=", 4) != 0 ? 0 : 4), lmac);
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| 177 | if (ch->mac == NULL)
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| 178 | bb_error_msg_and_die("can't parse %s", selector);
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| 179 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 180 | found_selector++;
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| 181 | };
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| 182 | selector = next;
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| 183 | }
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| 184 | if (found_selector == 0)
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| 185 | bb_error_msg_and_die("no selectors found for %s", ch->ifname);
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| 186 | #endif
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| 187 | }
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| 188 |
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| 189 | static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
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| 190 | {
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| 191 | ethtable_t *ch;
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| 192 | if (strlen(ifname) >= IFNAMSIZ)
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| 193 | bb_error_msg_and_die("interface name '%s' too long", ifname);
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| 194 | ch = xzalloc(sizeof(*ch));
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| 195 | ch->ifname = xstrdup(ifname);
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| 196 | nameif_parse_selector(ch, selector);
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| 197 | ch->next = *clist;
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| 198 | if (*clist)
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| 199 | (*clist)->prev = ch;
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| 200 | *clist = ch;
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| 201 | }
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| 202 |
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| 203 | #if ENABLE_FEATURE_CLEAN_UP
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| 204 | static void delete_eth_table(ethtable_t *ch)
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| 205 | {
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| 206 | free(ch->ifname);
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| 207 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 208 | free(ch->bus_info);
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| 209 | free(ch->driver);
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| 210 | #endif
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| 211 | free(ch->mac);
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| 212 | free(ch);
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| 213 | };
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| 214 | #else
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| 215 | void delete_eth_table(ethtable_t *ch);
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| 216 | #endif
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| 217 |
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| 218 | int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 219 | int nameif_main(int argc UNUSED_PARAM, char **argv)
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| 220 | {
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| 221 | ethtable_t *clist = NULL;
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| 222 | const char *fname = "/etc/mactab";
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| 223 | int ctl_sk;
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| 224 | ethtable_t *ch;
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| 225 | parser_t *parser;
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| 226 | char *token[2];
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| 227 |
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| 228 | if (1 & getopt32(argv, "sc:", &fname)) {
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| 229 | openlog(applet_name, 0, LOG_LOCAL0);
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| 230 | /* Why not just "="? I assume logging to stderr
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| 231 | * can't hurt. 2>/dev/null if you don't like it: */
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| 232 | logmode |= LOGMODE_SYSLOG;
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| 233 | }
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| 234 | argv += optind;
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| 235 |
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| 236 | if (argv[0]) {
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| 237 | do {
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| 238 | if (!argv[1])
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| 239 | bb_show_usage();
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| 240 | prepend_new_eth_table(&clist, argv[0], argv[1]);
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| 241 | argv += 2;
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| 242 | } while (*argv);
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| 243 | } else {
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| 244 | parser = config_open(fname);
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| 245 | while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL))
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| 246 | prepend_new_eth_table(&clist, token[0], token[1]);
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| 247 | config_close(parser);
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| 248 | }
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| 249 |
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| 250 | ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
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| 251 | parser = config_open2("/proc/net/dev", xfopen_for_read);
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| 252 |
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| 253 | while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
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| 254 | struct ifreq ifr;
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| 255 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 256 | struct ethtool_drvinfo drvinfo;
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| 257 | struct ethtool_cmd eth_settings;
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| 258 | #endif
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| 259 | if (parser->lineno <= 2)
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| 260 | continue; /* Skip the first two lines */
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| 261 |
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| 262 | /* Find the current interface name and copy it to ifr.ifr_name */
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| 263 | memset(&ifr, 0, sizeof(struct ifreq));
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| 264 | strncpy_IFNAMSIZ(ifr.ifr_name, token[0]);
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| 265 |
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| 266 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 267 | /* Check for phy address */
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| 268 | memset(ð_settings, 0, sizeof(eth_settings));
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| 269 | eth_settings.cmd = ETHTOOL_GSET;
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| 270 | ifr.ifr_data = (caddr_t) ð_settings;
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| 271 | ioctl(ctl_sk, SIOCETHTOOL, &ifr);
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| 272 |
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| 273 | /* Check for driver etc. */
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| 274 | memset(&drvinfo, 0, sizeof(drvinfo));
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| 275 | drvinfo.cmd = ETHTOOL_GDRVINFO;
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| 276 | ifr.ifr_data = (caddr_t) &drvinfo;
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| 277 | /* Get driver and businfo first, so we have it in drvinfo */
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| 278 | ioctl(ctl_sk, SIOCETHTOOL, &ifr);
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| 279 | #endif
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| 280 | ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
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| 281 |
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| 282 | /* Search the list for a matching device */
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| 283 | for (ch = clist; ch; ch = ch->next) {
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| 284 | #if ENABLE_FEATURE_NAMEIF_EXTENDED
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| 285 | if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
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| 286 | continue;
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| 287 | if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
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| 288 | continue;
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| 289 | if (ch->phy_address != -1 && ch->phy_address != eth_settings.phy_address)
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| 290 | continue;
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| 291 | #endif
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| 292 | if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
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| 293 | continue;
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| 294 | /* if we came here, all selectors have matched */
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| 295 | break;
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| 296 | }
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| 297 | /* Nothing found for current interface */
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| 298 | if (!ch)
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| 299 | continue;
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| 300 |
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| 301 | if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
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| 302 | strcpy(ifr.ifr_newname, ch->ifname);
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| 303 | ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
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| 304 | "can't change ifname %s to %s",
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| 305 | ifr.ifr_name, ch->ifname);
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| 306 | }
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| 307 | /* Remove list entry of renamed interface */
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| 308 | if (ch->prev != NULL)
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| 309 | ch->prev->next = ch->next;
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| 310 | else
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| 311 | clist = ch->next;
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| 312 | if (ch->next != NULL)
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| 313 | ch->next->prev = ch->prev;
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| 314 | if (ENABLE_FEATURE_CLEAN_UP)
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| 315 | delete_eth_table(ch);
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| 316 | }
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| 317 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 318 | for (ch = clist; ch; ch = ch->next)
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| 319 | delete_eth_table(ch);
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| 320 | config_close(parser);
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| 321 | };
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| 322 |
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| 323 | return 0;
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| 324 | }
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