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 <net/if_arp.h>
51 #include <netinet/in.h>
52 #if defined(__GLIBC__) && __GLIBC__ >=2 && __GLIBC_MINOR__ >= 1
53 #include <netpacket/packet.h>
54 #include <net/ethernet.h>
56 #include <sys/types.h>
57 #include <netinet/if_ether.h>
60 #include "inet_common.h"
62 #if ENABLE_FEATURE_IFCONFIG_SLIP
63 # include <net/if_slip.h>
66 /* I don't know if this is needed for busybox or not. Anyone? */
67 #define QUESTIONABLE_ALIAS_CASE
70 /* Defines for glibc2.0 users. */
72 # define SIOCSIFTXQLEN 0x8943
73 # define SIOCGIFTXQLEN 0x8942
76 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
78 # define ifr_qlen ifr_ifru.ifru_mtu
82 # define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
85 #if ENABLE_FEATURE_IPV6
87 struct in6_addr ifr6_addr;
88 uint32_t ifr6_prefixlen;
94 * Here are the bit masks for the "flags" member of struct options below.
95 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
96 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
105 #define M_MASK (M_CLR | M_SET | M_ARG)
106 #define N_MASK (N_CLR | N_SET | N_ARG)
107 #define SET_MASK (N_SET | M_SET)
108 #define CLR_MASK (N_CLR | M_CLR)
109 #define SET_CLR_MASK (SET_MASK | CLR_MASK)
110 #define ARG_MASK (M_ARG | N_ARG)
113 * Here are the bit masks for the "arg_flags" member of struct options below.
120 * 02 HOST_COPY in_ether
121 * 03 HOST_COPY INET_resolve
123 #define A_CAST_TYPE 0x03
126 * 00 not a map type (mem_start, io_addr, irq)
127 * 04 memstart (unsigned long)
128 * 08 io_addr (unsigned short)
129 * 0C irq (unsigned char)
131 #define A_MAP_TYPE 0x0C
132 #define A_ARG_REQ 0x10 /* Set if an arg is required. */
133 #define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
134 #define A_SET_AFTER 0x40 /* Set a flag at the end. */
135 #define A_COLON_CHK 0x80 /* Is this needed? See below. */
136 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
137 #define A_HOSTNAME 0x100 /* Set if it is ip addr. */
138 #define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
141 #define A_BROADCAST 0
145 * These defines are for dealing with the A_CAST_TYPE field.
147 #define A_CAST_CHAR_PTR 0x01
148 #define A_CAST_RESOLVE 0x01
149 #define A_CAST_HOST_COPY 0x02
150 #define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
151 #define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
154 * These defines are for dealing with the A_MAP_TYPE field.
156 #define A_MAP_ULONG 0x04 /* memstart */
157 #define A_MAP_USHORT 0x08 /* io_addr */
158 #define A_MAP_UCHAR 0x0C /* irq */
161 * Define the bit masks signifying which operations to perform for each arg.
164 #define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
165 #define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
166 #define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
167 #define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
168 #define ARG_IO_ADDR (A_ARG_REQ | A_MAP_ULONG)
169 #define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
170 #define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
171 #define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
172 #define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
173 #define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
174 #define ARG_POINTOPOINT (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
175 #define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
176 #define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
177 #define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
178 #define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
182 * Set up the tables. Warning! They must have corresponding order!
187 unsigned short selector;
188 unsigned short ifr_offset;
193 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
194 const unsigned int flags:6;
195 const unsigned int arg_flags:10;
197 const unsigned char flags;
198 const unsigned char arg_flags;
200 const unsigned short selector;
203 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
205 static const struct arg1opt Arg1Opt[] = {
206 { "SIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric) },
207 { "SIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu) },
208 { "SIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen) },
209 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
210 { "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
211 { "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
212 #if ENABLE_FEATURE_IFCONFIG_HW
213 { "SIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr) },
215 { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
216 #ifdef SIOCSKEEPALIVE
217 { "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
220 { "SOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data) },
222 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
223 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start) },
224 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr) },
225 { "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq) },
227 /* Last entry if for unmatched (possibly hostname) arg. */
228 #if ENABLE_FEATURE_IPV6
229 { "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
230 { "DIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
232 { "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) },
235 static const struct options OptArray[] = {
236 { "metric", N_ARG, ARG_METRIC, 0 },
237 { "mtu", N_ARG, ARG_MTU, 0 },
238 { "txqueuelen", N_ARG, ARG_TXQUEUELEN, 0 },
239 { "dstaddr", N_ARG, ARG_DSTADDR, 0 },
240 { "netmask", N_ARG, ARG_NETMASK, 0 },
241 { "broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST },
242 #if ENABLE_FEATURE_IFCONFIG_HW
243 { "hw", N_ARG, ARG_HW, 0 },
245 { "pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT },
246 #ifdef SIOCSKEEPALIVE
247 { "keepalive", N_ARG, ARG_KEEPALIVE, 0 },
250 { "outfill", N_ARG, ARG_OUTFILL, 0 },
252 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
253 { "mem_start", N_ARG, ARG_MEM_START, 0 },
254 { "io_addr", N_ARG, ARG_IO_ADDR, 0 },
255 { "irq", N_ARG, ARG_IRQ, 0 },
257 #if ENABLE_FEATURE_IPV6
258 { "add", N_ARG, ARG_ADD_DEL, 0 },
259 { "del", N_ARG, ARG_ADD_DEL, 0 },
261 { "arp", N_CLR | M_SET, 0, IFF_NOARP },
262 { "trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS },
263 { "promisc", N_SET | M_CLR, 0, IFF_PROMISC },
264 { "multicast", N_SET | M_CLR, 0, IFF_MULTICAST },
265 { "allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI },
266 { "dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC },
267 { "up", N_SET, 0, (IFF_UP | IFF_RUNNING) },
268 { "down", N_CLR, 0, IFF_UP },
269 { NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING) }
273 * A couple of prototypes.
275 #if ENABLE_FEATURE_IFCONFIG_HW
276 static int in_ether(const char *bufp, struct sockaddr *sap);
282 int ifconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
283 int ifconfig_main(int argc UNUSED_PARAM, char **argv)
286 struct sockaddr_in sai;
287 #if ENABLE_FEATURE_IFCONFIG_HW
290 const struct arg1opt *a1op;
291 const struct options *op;
292 int sockfd; /* socket fd we use to manipulate stuff with */
294 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
296 unsigned int did_flags;
297 unsigned int sai_hostname, sai_netmask;
300 unsigned char did_flags;
304 const char *host = NULL; /* make gcc happy */
307 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
315 #if ENABLE_FEATURE_IFCONFIG_STATUS
316 if (argv[0] && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
322 if (!argv[0] || !argv[1]) { /* one or no args */
323 #if ENABLE_FEATURE_IFCONFIG_STATUS
324 return display_interfaces(argv[0] /* can be NULL */);
326 bb_error_msg_and_die("no support for status display");
330 /* Create a channel to the NET kernel. */
331 sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
333 /* get interface name */
334 strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
336 /* Process the remaining arguments. */
337 while (*++argv != (char *) NULL) {
340 if (*p == '-') { /* If the arg starts with '-'... */
341 ++p; /* advance past it and */
342 mask = M_MASK; /* set the appropriate mask. */
344 for (op = OptArray; op->name; op++) { /* Find table entry. */
345 if (strcmp(p, op->name) == 0) { /* If name matches... */
347 if (mask) /* set the mask and go. */
349 /* If we get here, there was a valid arg with an */
350 /* invalid '-' prefix. */
351 bb_error_msg_and_die("bad: '%s'", p-1);
355 /* We fell through, so treat as possible hostname. */
356 a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
357 mask = op->arg_flags;
361 if (mask & ARG_MASK) {
362 mask = op->arg_flags;
363 a1op = Arg1Opt + (op - OptArray);
364 if (mask & A_NETMASK & did_flags)
366 if (*++argv == NULL) {
367 if (mask & A_ARG_REQ)
370 mask &= A_SET_AFTER; /* just for broadcast */
371 } else { /* got an arg so process it */
373 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
374 if (mask & A_CAST_HOST_COPY) {
375 #if ENABLE_FEATURE_IFCONFIG_HW
376 if (mask & A_CAST_RESOLVE) {
378 #if ENABLE_FEATURE_IPV6
382 /*safe_strncpy(host, *argv, (sizeof host));*/
384 #if ENABLE_FEATURE_IPV6
385 prefix = strchr(host, '/');
387 prefix_len = xatou_range(prefix + 1, 0, 128);
391 sai.sin_family = AF_INET;
393 if (strcmp(host, "default") == 0) {
394 /* Default is special, meaning 0.0.0.0. */
395 sai.sin_addr.s_addr = INADDR_ANY;
397 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
398 else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
399 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
401 /* + is special, meaning broadcast is derived. */
402 sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
406 len_and_sockaddr *lsa;
407 if (strcmp(host, "inet") == 0)
408 continue; /* compat stuff */
409 lsa = xhost2sockaddr(host, 0);
410 #if ENABLE_FEATURE_IPV6
411 if (lsa->u.sa.sa_family == AF_INET6) {
413 struct in6_ifreq ifr6;
415 memcpy((char *) &ifr6.ifr6_addr,
416 (char *) &(lsa->u.sin6.sin6_addr),
417 sizeof(struct in6_addr));
419 /* Create a channel to the NET kernel. */
420 sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
421 xioctl(sockfd6, SIOGIFINDEX, &ifr);
422 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
423 ifr6.ifr6_prefixlen = prefix_len;
424 ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
425 if (ENABLE_FEATURE_CLEAN_UP)
430 sai.sin_addr = lsa->u.sin.sin_addr;
431 if (ENABLE_FEATURE_CLEAN_UP)
434 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
435 if (mask & A_HOSTNAME)
436 sai_hostname = sai.sin_addr.s_addr;
437 if (mask & A_NETMASK)
438 sai_netmask = sai.sin_addr.s_addr;
441 #if ENABLE_FEATURE_IFCONFIG_HW
442 } else { /* A_CAST_HOST_COPY_IN_ETHER */
443 /* This is the "hw" arg case. */
444 smalluint hw_class= index_in_substrings("ether\0"
445 IF_FEATURE_HWIB("infiniband\0"), *argv) + 1;
446 if (!hw_class || !*++argv)
448 /*safe_strncpy(host, *argv, sizeof(host));*/
450 if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
451 bb_error_msg_and_die("invalid hw-addr %s", host);
455 memcpy( (((char *)&ifr) + a1op->ifr_offset),
456 p, sizeof(struct sockaddr));
458 /* FIXME: error check?? */
459 unsigned long i = strtoul(*argv, NULL, 0);
460 p = ((char *)&ifr) + a1op->ifr_offset;
461 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
462 if (mask & A_MAP_TYPE) {
463 xioctl(sockfd, SIOCGIFMAP, &ifr);
464 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
465 *((unsigned char *) p) = i;
466 else if (mask & A_MAP_USHORT)
467 *((unsigned short *) p) = i;
469 *((unsigned long *) p) = i;
472 if (mask & A_CAST_CHAR_PTR)
473 *((caddr_t *) p) = (caddr_t) i;
474 else /* A_CAST_INT */
478 ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
479 #ifdef QUESTIONABLE_ALIAS_CASE
480 if (mask & A_COLON_CHK) {
482 * Don't do the set_flag() if the address is an alias with
483 * a '-' at the end, since it's deleted already! - Roman
485 * Should really use regex.h here, not sure though how well
486 * it'll go with the cross-platform support etc.
489 short int found_colon = 0;
490 for (ptr = ifr.ifr_name; *ptr; ptr++)
493 if (found_colon && ptr[-1] == '-')
498 if (!(mask & A_SET_AFTER))
503 xioctl(sockfd, SIOCGIFFLAGS, &ifr);
504 selector = op->selector;
506 ifr.ifr_flags |= selector;
508 ifr.ifr_flags &= ~selector;
509 xioctl(sockfd, SIOCSIFFLAGS, &ifr);
512 if (ENABLE_FEATURE_CLEAN_UP)
517 #if ENABLE_FEATURE_IFCONFIG_HW
518 /* Input an Ethernet address and convert to binary. */
519 static int in_ether(const char *bufp, struct sockaddr *sap)
526 sap->sa_family = ARPHRD_ETHER;
527 ptr = (char *) sap->sa_data;
533 /* We might get a semicolon here - not required. */
534 if (i && (*bufp == ':')) {
540 if (((unsigned char)(c - '0')) <= 9) {
542 } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
543 c = (c|0x20) - ('a'-10);
544 } else if (j && (c == ':' || c == 0)) {
554 } while (++i < ETH_ALEN);
556 return *bufp; /* Error if we don't end at end of string. */