source: MondoRescue/branches/2.2.9/mindi-busybox/networking/nameif.c@ 3320

Last change on this file since 3320 was 3320, checked in by Bruno Cornec, 9 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 6.1 KB
Line 
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#include "libbb.h"
14#include <syslog.h>
15#include <net/if.h>
16#include <netinet/ether.h>
17#include <linux/sockios.h>
18
19#ifndef IFNAMSIZ
20#define IFNAMSIZ 16
21#endif
22
23/* Taken from linux/sockios.h */
24#define SIOCSIFNAME 0x8923 /* set interface name */
25
26/* Octets in one Ethernet addr, from <linux/if_ether.h> */
27#define ETH_ALEN 6
28
29#ifndef ifr_newname
30#define ifr_newname ifr_ifru.ifru_slave
31#endif
32
33typedef struct ethtable_s {
34 struct ethtable_s *next;
35 struct ethtable_s *prev;
36 char *ifname;
37 struct ether_addr *mac;
38#if ENABLE_FEATURE_NAMEIF_EXTENDED
39 char *bus_info;
40 char *driver;
41#endif
42} ethtable_t;
43
44#if ENABLE_FEATURE_NAMEIF_EXTENDED
45/* Cut'n'paste from ethtool.h */
46#define ETHTOOL_BUSINFO_LEN 32
47/* these strings are set to whatever the driver author decides... */
48struct ethtool_drvinfo {
49 uint32_t cmd;
50 char driver[32]; /* driver short name, "tulip", "eepro100" */
51 char version[32]; /* driver version string */
52 char fw_version[32]; /* firmware version string, if applicable */
53 char bus_info[ETHTOOL_BUSINFO_LEN]; /* Bus info for this IF. */
54 /* For PCI devices, use pci_dev->slot_name. */
55 char reserved1[32];
56 char reserved2[16];
57 uint32_t n_stats; /* number of u64's from ETHTOOL_GSTATS */
58 uint32_t testinfo_len;
59 uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
60 uint32_t regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
61};
62#define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
63#endif
64
65
66static void nameif_parse_selector(ethtable_t *ch, char *selector)
67{
68 struct ether_addr *lmac;
69#if ENABLE_FEATURE_NAMEIF_EXTENDED
70 int found_selector = 0;
71
72 while (*selector) {
73 char *next;
74#endif
75 selector = skip_whitespace(selector);
76#if ENABLE_FEATURE_NAMEIF_EXTENDED
77 if (*selector == '\0')
78 break;
79 /* Search for the end .... */
80 next = skip_non_whitespace(selector);
81 if (*next)
82 *next++ = '\0';
83 /* Check for selectors, mac= is assumed */
84 if (strncmp(selector, "bus=", 4) == 0) {
85 ch->bus_info = xstrdup(selector + 4);
86 found_selector++;
87 } else if (strncmp(selector, "driver=", 7) == 0) {
88 ch->driver = xstrdup(selector + 7);
89 found_selector++;
90 } else {
91#endif
92 lmac = xmalloc(ETH_ALEN);
93 ch->mac = ether_aton_r(selector + (strncmp(selector, "mac=", 4) != 0 ? 0 : 4), lmac);
94 if (ch->mac == NULL)
95 bb_error_msg_and_die("can't parse %s", selector);
96#if ENABLE_FEATURE_NAMEIF_EXTENDED
97 found_selector++;
98 };
99 selector = next;
100 }
101 if (found_selector == 0)
102 bb_error_msg_and_die("no selectors found for %s", ch->ifname);
103#endif
104}
105
106static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
107{
108 ethtable_t *ch;
109 if (strlen(ifname) >= IFNAMSIZ)
110 bb_error_msg_and_die("interface name '%s' too long", ifname);
111 ch = xzalloc(sizeof(*ch));
112 ch->ifname = xstrdup(ifname);
113 nameif_parse_selector(ch, selector);
114 ch->next = *clist;
115 if (*clist)
116 (*clist)->prev = ch;
117 *clist = ch;
118}
119
120#if ENABLE_FEATURE_CLEAN_UP
121static void delete_eth_table(ethtable_t *ch)
122{
123 free(ch->ifname);
124#if ENABLE_FEATURE_NAMEIF_EXTENDED
125 free(ch->bus_info);
126 free(ch->driver);
127#endif
128 free(ch->mac);
129 free(ch);
130};
131#else
132void delete_eth_table(ethtable_t *ch);
133#endif
134
135int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
136int nameif_main(int argc, char **argv)
137{
138 ethtable_t *clist = NULL;
139 const char *fname = "/etc/mactab";
140 int ctl_sk;
141 ethtable_t *ch;
142 parser_t *parser;
143 char *token[2];
144
145 if (1 & getopt32(argv, "sc:", &fname)) {
146 openlog(applet_name, 0, LOG_LOCAL0);
147 /* Why not just "="? I assume logging to stderr
148 * can't hurt. 2>/dev/null if you don't like it: */
149 logmode |= LOGMODE_SYSLOG;
150 }
151 argc -= optind;
152 argv += optind;
153
154 if (argc & 1)
155 bb_show_usage();
156
157 if (argc) {
158 while (*argv) {
159 char *ifname = xstrdup(*argv++);
160 prepend_new_eth_table(&clist, ifname, *argv++);
161 }
162 } else {
163 parser = config_open(fname);
164 while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL))
165 prepend_new_eth_table(&clist, token[0], token[1]);
166 config_close(parser);
167 }
168
169 ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
170 parser = config_open2("/proc/net/dev", xfopen_for_read);
171
172 while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
173 struct ifreq ifr;
174#if ENABLE_FEATURE_NAMEIF_EXTENDED
175 struct ethtool_drvinfo drvinfo;
176#endif
177 if (parser->lineno < 2)
178 continue; /* Skip the first two lines */
179
180 /* Find the current interface name and copy it to ifr.ifr_name */
181 memset(&ifr, 0, sizeof(struct ifreq));
182 strncpy_IFNAMSIZ(ifr.ifr_name, token[0]);
183
184#if ENABLE_FEATURE_NAMEIF_EXTENDED
185 /* Check for driver etc. */
186 memset(&drvinfo, 0, sizeof(struct ethtool_drvinfo));
187 drvinfo.cmd = ETHTOOL_GDRVINFO;
188 ifr.ifr_data = (caddr_t) &drvinfo;
189 /* Get driver and businfo first, so we have it in drvinfo */
190 ioctl(ctl_sk, SIOCETHTOOL, &ifr);
191#endif
192 ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
193
194 /* Search the list for a matching device */
195 for (ch = clist; ch; ch = ch->next) {
196#if ENABLE_FEATURE_NAMEIF_EXTENDED
197 if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
198 continue;
199 if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
200 continue;
201#endif
202 if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
203 continue;
204 /* if we came here, all selectors have matched */
205 break;
206 }
207 /* Nothing found for current interface */
208 if (!ch)
209 continue;
210
211 if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
212 strcpy(ifr.ifr_newname, ch->ifname);
213 ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
214 "can't change ifname %s to %s",
215 ifr.ifr_name, ch->ifname);
216 }
217 /* Remove list entry of renamed interface */
218 if (ch->prev != NULL)
219 ch->prev->next = ch->next;
220 else
221 clist = ch->next;
222 if (ch->next != NULL)
223 ch->next->prev = ch->prev;
224 if (ENABLE_FEATURE_CLEAN_UP)
225 delete_eth_table(ch);
226 }
227 if (ENABLE_FEATURE_CLEAN_UP) {
228 for (ch = clist; ch; ch = ch->next)
229 delete_eth_table(ch);
230 config_close(parser);
231 };
232
233 return 0;
234}
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