1 /* vi: set sw=4 ts=4: */
4 * Similar to the standard Unix ifconfig, but with only the necessary
5 * parts for AF_INET, and without any printing of if info (for now).
7 * Bjorn Wesen, Axis Communications AB
10 * Authors of the original ifconfig was:
11 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
13 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
17 * Heavily modified by Manuel Novoa III Mar 6, 2001
19 * From initial port to busybox, removed most of the redundancy by
20 * converting to a table-driven approach. Added several (optional)
21 * args missing from initial port.
23 * Still missing: media, tunnel.
26 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
29 //usage:#define ifconfig_trivial_usage
30 //usage: IF_FEATURE_IFCONFIG_STATUS("[-a]") " interface [address]"
31 //usage:#define ifconfig_full_usage "\n\n"
32 //usage: "Configure a network interface\n"
34 //usage: IF_FEATURE_IPV6(
35 //usage: " [add ADDRESS[/PREFIXLEN]]\n")
36 //usage: IF_FEATURE_IPV6(
37 //usage: " [del ADDRESS[/PREFIXLEN]]\n")
38 //usage: " [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]\n"
39 //usage: " [netmask ADDRESS] [dstaddr ADDRESS]\n"
40 //usage: IF_FEATURE_IFCONFIG_SLIP(
41 //usage: " [outfill NN] [keepalive NN]\n")
42 //usage: " " IF_FEATURE_IFCONFIG_HW("[hw ether" IF_FEATURE_HWIB("|infiniband")" ADDRESS] ") "[metric NN] [mtu NN]\n"
43 //usage: " [[-]trailers] [[-]arp] [[-]allmulti]\n"
44 //usage: " [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]\n"
45 //usage: IF_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ(
46 //usage: " [mem_start NN] [io_addr NN] [irq NN]\n")
47 //usage: " [up|down] ..."
50 #include "inet_common.h"
52 #include <net/if_arp.h>
53 #include <netinet/in.h>
54 #ifdef HAVE_NET_ETHERNET_H
55 # include <net/ethernet.h>
58 #if ENABLE_FEATURE_IFCONFIG_SLIP
59 # include <net/if_slip.h>
62 /* I don't know if this is needed for busybox or not. Anyone? */
63 #define QUESTIONABLE_ALIAS_CASE
66 /* Defines for glibc2.0 users. */
68 # define SIOCSIFTXQLEN 0x8943
69 # define SIOCGIFTXQLEN 0x8942
72 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
74 # define ifr_qlen ifr_ifru.ifru_mtu
78 # define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
81 #if ENABLE_FEATURE_IPV6
83 struct in6_addr ifr6_addr;
84 uint32_t ifr6_prefixlen;
90 * Here are the bit masks for the "flags" member of struct options below.
91 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
92 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
101 #define M_MASK (M_CLR | M_SET | M_ARG)
102 #define N_MASK (N_CLR | N_SET | N_ARG)
103 #define SET_MASK (N_SET | M_SET)
104 #define CLR_MASK (N_CLR | M_CLR)
105 #define SET_CLR_MASK (SET_MASK | CLR_MASK)
106 #define ARG_MASK (M_ARG | N_ARG)
109 * Here are the bit masks for the "arg_flags" member of struct options below.
116 * 02 HOST_COPY in_ether
117 * 03 HOST_COPY INET_resolve
119 #define A_CAST_TYPE 0x03
122 * 00 not a map type (mem_start, io_addr, irq)
123 * 04 memstart (unsigned long)
124 * 08 io_addr (unsigned short)
125 * 0C irq (unsigned char)
127 #define A_MAP_TYPE 0x0C
128 #define A_ARG_REQ 0x10 /* Set if an arg is required. */
129 #define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
130 #define A_SET_AFTER 0x40 /* Set a flag at the end. */
131 #define A_COLON_CHK 0x80 /* Is this needed? See below. */
132 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
133 #define A_HOSTNAME 0x100 /* Set if it is ip addr. */
134 #define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
137 #define A_BROADCAST 0
141 * These defines are for dealing with the A_CAST_TYPE field.
143 #define A_CAST_CHAR_PTR 0x01
144 #define A_CAST_RESOLVE 0x01
145 #define A_CAST_HOST_COPY 0x02
146 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
147 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
150 * These defines are for dealing with the A_MAP_TYPE field.
152 #define A_MAP_ULONG 0x04 /* memstart */
153 #define A_MAP_USHORT 0x08 /* io_addr */
154 #define A_MAP_UCHAR 0x0C /* irq */
157 * Define the bit masks signifying which operations to perform for each arg.
160 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
161 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
162 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
163 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
164 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
165 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
166 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
167 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
168 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
169 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
170 #define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
171 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
172 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
173 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
174 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
178 * Set up the tables. Warning! They must have corresponding order!
183 unsigned short selector;
184 unsigned short ifr_offset;
189 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
190 const unsigned int flags:6;
191 const unsigned int arg_flags:10;
193 const unsigned char flags;
194 const unsigned char arg_flags;
196 const unsigned short selector;
199 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
201 static const struct arg1opt Arg1Opt[] = {
202 { "SIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric) },
203 { "SIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu) },
204 { "SIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen) },
205 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
206 { "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
207 { "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
208 #if ENABLE_FEATURE_IFCONFIG_HW
209 { "SIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr) },
211 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
212 #ifdef SIOCSKEEPALIVE
213 { "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
216 { "SOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data) },
218 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
219 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start) },
220 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr) },
221 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq) },
223 /* Last entry if for unmatched (possibly hostname) arg. */
224 #if ENABLE_FEATURE_IPV6
225 { "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
226 { "DIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
228 { "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) },
231 static const struct options OptArray[] = {
232 { "metric", N_ARG, ARG_METRIC, 0 },
233 { "mtu", N_ARG, ARG_MTU, 0 },
234 { "txqueuelen", N_ARG, ARG_TXQUEUELEN, 0 },
235 { "dstaddr", N_ARG, ARG_DSTADDR, 0 },
236 { "netmask", N_ARG, ARG_NETMASK, 0 },
237 { "broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST },
238 #if ENABLE_FEATURE_IFCONFIG_HW
239 { "hw", N_ARG, ARG_HW, 0 },
241 { "pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT },
242 #ifdef SIOCSKEEPALIVE
243 { "keepalive", N_ARG, ARG_KEEPALIVE, 0 },
246 { "outfill", N_ARG, ARG_OUTFILL, 0 },
248 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
249 { "mem_start", N_ARG, ARG_MEM_START, 0 },
250 { "io_addr", N_ARG, ARG_IO_ADDR, 0 },
251 { "irq", N_ARG, ARG_IRQ, 0 },
253 #if ENABLE_FEATURE_IPV6
254 { "add", N_ARG, ARG_ADD_DEL, 0 },
255 { "del", N_ARG, ARG_ADD_DEL, 0 },
257 { "arp", N_CLR | M_SET, 0, IFF_NOARP },
258 { "trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS },
259 { "promisc", N_SET | M_CLR, 0, IFF_PROMISC },
260 { "multicast", N_SET | M_CLR, 0, IFF_MULTICAST },
261 { "allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI },
262 { "dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC },
263 { "up", N_SET, 0, (IFF_UP | IFF_RUNNING) },
264 { "down", N_CLR, 0, IFF_UP },
265 { NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING) }
269 * A couple of prototypes.
271 #if ENABLE_FEATURE_IFCONFIG_HW
272 static int in_ether(const char *bufp, struct sockaddr *sap);
278 int ifconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
279 int ifconfig_main(int argc UNUSED_PARAM, char **argv)
282 struct sockaddr_in sai;
283 #if ENABLE_FEATURE_IFCONFIG_HW
286 const struct arg1opt *a1op;
287 const struct options *op;
288 int sockfd; /* socket fd we use to manipulate stuff with */
290 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
292 unsigned int did_flags;
293 unsigned int sai_hostname, sai_netmask;
296 unsigned char did_flags;
300 const char *host = NULL; /* make gcc happy */
303 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
311 #if ENABLE_FEATURE_IFCONFIG_STATUS
312 if (argv[0] && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
318 if (!argv[0] || !argv[1]) { /* one or no args */
319 #if ENABLE_FEATURE_IFCONFIG_STATUS
320 return display_interfaces(argv[0] /* can be NULL */);
322 bb_error_msg_and_die("no support for status display");
326 /* Create a channel to the NET kernel. */
327 sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
329 /* get interface name */
330 strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
332 /* Process the remaining arguments. */
333 while (*++argv != (char *) NULL) {
336 if (*p == '-') { /* If the arg starts with '-'... */
337 ++p; /* advance past it and */
338 mask = M_MASK; /* set the appropriate mask. */
340 for (op = OptArray; op->name; op++) { /* Find table entry. */
341 if (strcmp(p, op->name) == 0) { /* If name matches... */
343 if (mask) /* set the mask and go. */
345 /* If we get here, there was a valid arg with an */
346 /* invalid '-' prefix. */
347 bb_error_msg_and_die("bad: '%s'", p-1);
351 /* We fell through, so treat as possible hostname. */
352 a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
353 mask = op->arg_flags;
357 if (mask & ARG_MASK) {
358 mask = op->arg_flags;
359 a1op = Arg1Opt + (op - OptArray);
360 if (mask & A_NETMASK & did_flags)
362 if (*++argv == NULL) {
363 if (mask & A_ARG_REQ)
366 mask &= A_SET_AFTER; /* just for broadcast */
367 } else { /* got an arg so process it */
369 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
370 if (mask & A_CAST_HOST_COPY) {
371 #if ENABLE_FEATURE_IFCONFIG_HW
372 if (mask & A_CAST_RESOLVE) {
374 #if ENABLE_FEATURE_IPV6
378 /*safe_strncpy(host, *argv, (sizeof host));*/
380 #if ENABLE_FEATURE_IPV6
381 prefix = strchr(host, '/');
383 prefix_len = xatou_range(prefix + 1, 0, 128);
387 sai.sin_family = AF_INET;
389 if (strcmp(host, "default") == 0) {
390 /* Default is special, meaning 0.0.0.0. */
391 sai.sin_addr.s_addr = INADDR_ANY;
393 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
394 else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
395 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
397 /* + is special, meaning broadcast is derived. */
398 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
402 len_and_sockaddr *lsa;
403 if (strcmp(host, "inet") == 0)
404 continue; /* compat stuff */
405 lsa = xhost2sockaddr(host, 0);
406 #if ENABLE_FEATURE_IPV6
407 if (lsa->u.sa.sa_family == AF_INET6) {
409 struct in6_ifreq ifr6;
411 memcpy((char *) &ifr6.ifr6_addr,
412 (char *) &(lsa->u.sin6.sin6_addr),
413 sizeof(struct in6_addr));
415 /* Create a channel to the NET kernel. */
416 sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
417 xioctl(sockfd6, SIOGIFINDEX, &ifr);
418 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
419 ifr6.ifr6_prefixlen = prefix_len;
420 ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
421 if (ENABLE_FEATURE_CLEAN_UP)
426 sai.sin_addr = lsa->u.sin.sin_addr;
427 if (ENABLE_FEATURE_CLEAN_UP)
430 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
431 if (mask & A_HOSTNAME)
432 sai_hostname = sai.sin_addr.s_addr;
433 if (mask & A_NETMASK)
434 sai_netmask = sai.sin_addr.s_addr;
437 #if ENABLE_FEATURE_IFCONFIG_HW
438 } else { /* A_CAST_HOST_COPY_IN_ETHER */
439 /* This is the "hw" arg case. */
440 smalluint hw_class= index_in_substrings("ether\0"
441 IF_FEATURE_HWIB("infiniband\0"), *argv) + 1;
442 if (!hw_class || !*++argv)
444 /*safe_strncpy(host, *argv, sizeof(host));*/
446 if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
447 bb_error_msg_and_die("invalid hw-addr %s", host);
451 memcpy( (((char *)&ifr) + a1op->ifr_offset),
452 p, sizeof(struct sockaddr));
454 /* FIXME: error check?? */
455 unsigned long i = strtoul(*argv, NULL, 0);
456 p = ((char *)&ifr) + a1op->ifr_offset;
457 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
458 if (mask & A_MAP_TYPE) {
459 xioctl(sockfd, SIOCGIFMAP, &ifr);
460 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
461 *((unsigned char *) p) = i;
462 else if (mask & A_MAP_USHORT)
463 *((unsigned short *) p) = i;
465 *((unsigned long *) p) = i;
468 if (mask & A_CAST_CHAR_PTR)
469 *((caddr_t *) p) = (caddr_t) i;
470 else /* A_CAST_INT */
474 ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
475 #ifdef QUESTIONABLE_ALIAS_CASE
476 if (mask & A_COLON_CHK) {
478 * Don't do the set_flag() if the address is an alias with
479 * a '-' at the end, since it's deleted already! - Roman
481 * Should really use regex.h here, not sure though how well
482 * it'll go with the cross-platform support etc.
485 short int found_colon = 0;
486 for (ptr = ifr.ifr_name; *ptr; ptr++)
489 if (found_colon && ptr[-1] == '-')
494 if (!(mask & A_SET_AFTER))
499 xioctl(sockfd, SIOCGIFFLAGS, &ifr);
500 selector = op->selector;
502 ifr.ifr_flags |= selector;
504 ifr.ifr_flags &= ~selector;
505 xioctl(sockfd, SIOCSIFFLAGS, &ifr);
508 if (ENABLE_FEATURE_CLEAN_UP)
513 #if ENABLE_FEATURE_IFCONFIG_HW
514 /* Input an Ethernet address and convert to binary. */
515 static int in_ether(const char *bufp, struct sockaddr *sap)
522 sap->sa_family = ARPHRD_ETHER;
523 ptr = (char *) sap->sa_data;
529 /* We might get a semicolon here - not required. */
530 if (i && (*bufp == ':')) {
536 if (((unsigned char)(c - '0')) <= 9) {
538 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
539 c = (c|0x20) - ('a'-10);
540 } else if (j && (c == ':' || c == 0)) {
550 } while (++i < ETH_ALEN);
552 return *bufp; /* Error if we don't end at end of string. */