source: branches/3.2/mindi-busybox/networking/nameif.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 6 years ago
  • Update mindi-busybox to 1.21.1
File size: 9.6 KB
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1/* vi: set sw=4 ts=4: */
2/*
3 * nameif.c - Naming Interfaces based on MAC address for busybox.
4 *
5 * Written 2000 by Andi Kleen.
6 * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
7 *          Glenn McGrath
8 * Extended matching support 2008 by Nico Erfurth <masta@perlgolf.de>
9 *
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 */
12
13//config:config NAMEIF
14//config:   bool "nameif"
15//config:   default y
16//config:   select PLATFORM_LINUX
17//config:   select FEATURE_SYSLOG
18//config:   help
19//config:     nameif is used to rename network interface by its MAC address.
20//config:     Renamed interfaces MUST be in the down state.
21//config:     It is possible to use a file (default: /etc/mactab)
22//config:     with list of new interface names and MACs.
23//config:     Maximum interface name length: IFNAMSIZ = 16
24//config:     File fields are separated by space or tab.
25//config:     File format:
26//config:     # Comment
27//config:     new_interface_name    XX:XX:XX:XX:XX:XX
28//config:
29//config:config FEATURE_NAMEIF_EXTENDED
30//config:   bool "Extended nameif"
31//config:   default y
32//config:   depends on NAMEIF
33//config:   help
34//config:     This extends the nameif syntax to support the bus_info, driver,
35//config:     phyaddr selectors. The syntax is compatible to the normal nameif.
36//config:     File format:
37//config:       new_interface_name  driver=asix bus=usb-0000:00:08.2-3
38//config:       new_interface_name  bus=usb-0000:00:08.2-3 00:80:C8:38:91:B5
39//config:       new_interface_name  phy_address=2 00:80:C8:38:91:B5
40//config:       new_interface_name  mac=00:80:C8:38:91:B5
41//config:       new_interface_name  00:80:C8:38:91:B5
42
43//usage:#define nameif_trivial_usage
44//usage:    IF_NOT_FEATURE_NAMEIF_EXTENDED(
45//usage:        "[-s] [-c FILE] [IFNAME HWADDR]..."
46//usage:    )
47//usage:    IF_FEATURE_NAMEIF_EXTENDED(
48//usage:        "[-s] [-c FILE] [IFNAME SELECTOR]..."
49//usage:    )
50//usage:#define nameif_full_usage "\n\n"
51//usage:    "Rename network interface while it in the down state."
52//usage:    IF_NOT_FEATURE_NAMEIF_EXTENDED(
53//usage:     "\nThe device with address HWADDR is renamed to IFACE."
54//usage:    )
55//usage:    IF_FEATURE_NAMEIF_EXTENDED(
56//usage:     "\nThe device matched by SELECTOR is renamed to IFACE."
57//usage:     "\nSELECTOR can be a combination of:"
58//usage:     "\n    driver=STRING"
59//usage:     "\n    bus=STRING"
60//usage:     "\n    phy_address=NUM"
61//usage:     "\n    [mac=]XX:XX:XX:XX:XX:XX"
62//usage:    )
63//usage:     "\n"
64//usage:     "\n    -c FILE Configuration file (default: /etc/mactab)"
65//usage:     "\n    -s  Log to syslog"
66//usage:
67//usage:#define nameif_example_usage
68//usage:       "$ nameif -s dmz0 00:A0:C9:8C:F6:3F\n"
69//usage:       " or\n"
70//usage:       "$ nameif -c /etc/my_mactab_file\n"
71
72#include "libbb.h"
73#include <syslog.h>
74#include <net/if.h>
75#include <netinet/ether.h>
76#include <linux/sockios.h>
77
78#ifndef IFNAMSIZ
79#define IFNAMSIZ 16
80#endif
81
82/* Taken from linux/sockios.h */
83#define SIOCSIFNAME  0x8923  /* set interface name */
84
85/* Octets in one Ethernet addr, from <linux/if_ether.h> */
86#define ETH_ALEN     6
87
88#ifndef ifr_newname
89#define ifr_newname ifr_ifru.ifru_slave
90#endif
91
92typedef struct ethtable_s {
93    struct ethtable_s *next;
94    struct ethtable_s *prev;
95    char *ifname;
96    struct ether_addr *mac;
97#if ENABLE_FEATURE_NAMEIF_EXTENDED
98    char *bus_info;
99    char *driver;
100    int32_t phy_address;
101#endif
102} ethtable_t;
103
104#if ENABLE_FEATURE_NAMEIF_EXTENDED
105/* Cut'n'paste from ethtool.h */
106#define ETHTOOL_BUSINFO_LEN 32
107/* these strings are set to whatever the driver author decides... */
108struct ethtool_drvinfo {
109    uint32_t cmd;
110    char  driver[32]; /* driver short name, "tulip", "eepro100" */
111    char  version[32];  /* driver version string */
112    char  fw_version[32]; /* firmware version string, if applicable */
113    char  bus_info[ETHTOOL_BUSINFO_LEN];  /* Bus info for this IF. */
114    /* For PCI devices, use pci_dev->slot_name. */
115    char  reserved1[32];
116    char  reserved2[16];
117    uint32_t n_stats;  /* number of u64's from ETHTOOL_GSTATS */
118    uint32_t testinfo_len;
119    uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
120    uint32_t regdump_len;  /* Size of data from ETHTOOL_GREGS (bytes) */
121};
122
123struct ethtool_cmd {
124    uint32_t   cmd;
125    uint32_t   supported;      /* Features this interface supports */
126    uint32_t   advertising;    /* Features this interface advertises */
127    uint16_t   speed;          /* The forced speed, 10Mb, 100Mb, gigabit */
128    uint8_t    duplex;         /* Duplex, half or full */
129    uint8_t    port;           /* Which connector port */
130    uint8_t    phy_address;
131    uint8_t    transceiver;    /* Which transceiver to use */
132    uint8_t    autoneg;        /* Enable or disable autonegotiation */
133    uint32_t   maxtxpkt;       /* Tx pkts before generating tx int */
134    uint32_t   maxrxpkt;       /* Rx pkts before generating rx int */
135    uint16_t   speed_hi;
136    uint16_t   reserved2;
137    uint32_t   reserved[3];
138};
139
140#define ETHTOOL_GSET      0x00000001 /* Get settings. */
141#define ETHTOOL_GDRVINFO  0x00000003 /* Get driver info. */
142#endif
143
144
145static void nameif_parse_selector(ethtable_t *ch, char *selector)
146{
147    struct ether_addr *lmac;
148#if ENABLE_FEATURE_NAMEIF_EXTENDED
149    int found_selector = 0;
150
151    while (*selector) {
152        char *next;
153#endif
154        selector = skip_whitespace(selector);
155#if ENABLE_FEATURE_NAMEIF_EXTENDED
156        ch->phy_address = -1;
157        if (*selector == '\0')
158            break;
159        /* Search for the end .... */
160        next = skip_non_whitespace(selector);
161        if (*next)
162            *next++ = '\0';
163        /* Check for selectors, mac= is assumed */
164        if (strncmp(selector, "bus=", 4) == 0) {
165            ch->bus_info = xstrdup(selector + 4);
166            found_selector++;
167        } else if (strncmp(selector, "driver=", 7) == 0) {
168            ch->driver = xstrdup(selector + 7);
169            found_selector++;
170        } else if (strncmp(selector, "phyaddr=", 8) == 0) {
171            ch->phy_address = xatoi_positive(selector + 8);
172            found_selector++;
173        } else {
174#endif
175            lmac = xmalloc(ETH_ALEN);
176            ch->mac = ether_aton_r(selector + (strncmp(selector, "mac=", 4) != 0 ? 0 : 4), lmac);
177            if (ch->mac == NULL)
178                bb_error_msg_and_die("can't parse %s", selector);
179#if  ENABLE_FEATURE_NAMEIF_EXTENDED
180            found_selector++;
181        };
182        selector = next;
183    }
184    if (found_selector == 0)
185        bb_error_msg_and_die("no selectors found for %s", ch->ifname);
186#endif
187}
188
189static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
190{
191    ethtable_t *ch;
192    if (strlen(ifname) >= IFNAMSIZ)
193        bb_error_msg_and_die("interface name '%s' too long", ifname);
194    ch = xzalloc(sizeof(*ch));
195    ch->ifname = xstrdup(ifname);
196    nameif_parse_selector(ch, selector);
197    ch->next = *clist;
198    if (*clist)
199        (*clist)->prev = ch;
200    *clist = ch;
201}
202
203#if ENABLE_FEATURE_CLEAN_UP
204static void delete_eth_table(ethtable_t *ch)
205{
206    free(ch->ifname);
207#if ENABLE_FEATURE_NAMEIF_EXTENDED
208    free(ch->bus_info);
209    free(ch->driver);
210#endif
211    free(ch->mac);
212    free(ch);
213};
214#else
215void delete_eth_table(ethtable_t *ch);
216#endif
217
218int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
219int nameif_main(int argc UNUSED_PARAM, char **argv)
220{
221    ethtable_t *clist = NULL;
222    const char *fname = "/etc/mactab";
223    int ctl_sk;
224    ethtable_t *ch;
225    parser_t *parser;
226    char *token[2];
227
228    if (1 & getopt32(argv, "sc:", &fname)) {
229        openlog(applet_name, 0, LOG_LOCAL0);
230        /* Why not just "="? I assume logging to stderr
231         * can't hurt. 2>/dev/null if you don't like it: */
232        logmode |= LOGMODE_SYSLOG;
233    }
234    argv += optind;
235
236    if (argv[0]) {
237        do {
238            if (!argv[1])
239                bb_show_usage();
240            prepend_new_eth_table(&clist, argv[0], argv[1]);
241            argv += 2;
242        } while (*argv);
243    } else {
244        parser = config_open(fname);
245        while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL))
246            prepend_new_eth_table(&clist, token[0], token[1]);
247        config_close(parser);
248    }
249
250    ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
251    parser = config_open2("/proc/net/dev", xfopen_for_read);
252
253    while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
254        struct ifreq ifr;
255#if  ENABLE_FEATURE_NAMEIF_EXTENDED
256        struct ethtool_drvinfo drvinfo;
257        struct ethtool_cmd eth_settings;
258#endif
259        if (parser->lineno <= 2)
260            continue; /* Skip the first two lines */
261
262        /* Find the current interface name and copy it to ifr.ifr_name */
263        memset(&ifr, 0, sizeof(struct ifreq));
264        strncpy_IFNAMSIZ(ifr.ifr_name, token[0]);
265
266#if ENABLE_FEATURE_NAMEIF_EXTENDED
267        /* Check for phy address */
268        memset(&eth_settings, 0, sizeof(eth_settings));
269        eth_settings.cmd = ETHTOOL_GSET;
270        ifr.ifr_data = (caddr_t) &eth_settings;
271        ioctl(ctl_sk, SIOCETHTOOL, &ifr);
272
273        /* Check for driver etc. */
274        memset(&drvinfo, 0, sizeof(drvinfo));
275        drvinfo.cmd = ETHTOOL_GDRVINFO;
276        ifr.ifr_data = (caddr_t) &drvinfo;
277        /* Get driver and businfo first, so we have it in drvinfo */
278        ioctl(ctl_sk, SIOCETHTOOL, &ifr);
279#endif
280        ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
281
282        /* Search the list for a matching device */
283        for (ch = clist; ch; ch = ch->next) {
284#if ENABLE_FEATURE_NAMEIF_EXTENDED
285            if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
286                continue;
287            if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
288                continue;
289            if (ch->phy_address != -1 && ch->phy_address != eth_settings.phy_address)
290                continue;
291#endif
292            if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
293                continue;
294            /* if we came here, all selectors have matched */
295            break;
296        }
297        /* Nothing found for current interface */
298        if (!ch)
299            continue;
300
301        if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
302            strcpy(ifr.ifr_newname, ch->ifname);
303            ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
304                    "can't change ifname %s to %s",
305                    ifr.ifr_name, ch->ifname);
306        }
307        /* Remove list entry of renamed interface */
308        if (ch->prev != NULL)
309            ch->prev->next = ch->next;
310        else
311            clist = ch->next;
312        if (ch->next != NULL)
313            ch->next->prev = ch->prev;
314        if (ENABLE_FEATURE_CLEAN_UP)
315            delete_eth_table(ch);
316    }
317    if (ENABLE_FEATURE_CLEAN_UP) {
318        for (ch = clist; ch; ch = ch->next)
319            delete_eth_table(ch);
320        config_close(parser);
321    };
322
323    return 0;
324}
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