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)
179 unsigned short selector
;
180 unsigned short ifr_offset
;
185 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
186 const unsigned int flags
:6;
187 const unsigned int arg_flags
:10;
189 const unsigned char flags
;
190 const unsigned char arg_flags
;
192 const unsigned short selector
;
195 #define ifreq_offsetof(x) offsetof(struct ifreq, x)
198 * Set up the tables. Warning! They must have corresponding order!
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 #if ENABLE_FEATURE_IPV6
224 { "SIFADDR", SIOCSIFADDR
, ifreq_offsetof(ifr_addr
) }, /* IPv6 version ignores the offset */
225 { "DIFADDR", SIOCDIFADDR
, ifreq_offsetof(ifr_addr
) }, /* IPv6 version ignores the offset */
227 /* Last entry is for unmatched (assumed to be hostname/address) arg. */
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
) }
268 #if ENABLE_FEATURE_IFCONFIG_HW
269 /* Input an Ethernet address and convert to binary. */
270 static int in_ether(const char *bufp
, struct sockaddr
*sap
)
277 sap
->sa_family
= ARPHRD_ETHER
;
278 ptr
= (char *) sap
->sa_data
;
284 /* We might get a semicolon here - not required. */
285 if (i
&& (*bufp
== ':')) {
291 if (((unsigned char)(c
- '0')) <= 9) {
293 } else if ((unsigned char)((c
|0x20) - 'a') <= 5) {
294 c
= (unsigned char)((c
|0x20) - 'a') + 10;
295 } else if (j
&& (c
== ':' || c
== 0)) {
305 } while (++i
< ETH_ALEN
);
307 return *bufp
; /* Error if we don't end at end of string. */
311 int ifconfig_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
312 int ifconfig_main(int argc UNUSED_PARAM
, char **argv
)
315 struct sockaddr_in sai
;
316 #if ENABLE_FEATURE_IFCONFIG_HW
319 const struct arg1opt
*a1op
;
320 const struct options
*op
;
321 int sockfd
; /* socket fd we use to manipulate stuff with */
323 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
325 unsigned int did_flags
;
326 unsigned int sai_hostname
, sai_netmask
;
329 unsigned char did_flags
;
333 const char *host
= NULL
; /* make gcc happy */
336 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
344 #if ENABLE_FEATURE_IFCONFIG_STATUS
345 if (argv
[0] && (argv
[0][0] == '-' && argv
[0][1] == 'a' && !argv
[0][2])) {
351 if (!argv
[0] || !argv
[1]) { /* one or no args */
352 #if ENABLE_FEATURE_IFCONFIG_STATUS
353 return display_interfaces(argv
[0] /* can be NULL */);
355 bb_error_msg_and_die("no support for status display");
359 /* Create a channel to the NET kernel. */
360 sockfd
= xsocket(AF_INET
, SOCK_DGRAM
, 0);
362 /* get interface name */
363 strncpy_IFNAMSIZ(ifr
.ifr_name
, *argv
);
365 /* Process the remaining arguments. */
366 while (*++argv
!= NULL
) {
369 if (*p
== '-') { /* If the arg starts with '-'... */
370 ++p
; /* advance past it and */
371 mask
= M_MASK
; /* set the appropriate mask. */
373 for (op
= OptArray
; op
->name
; op
++) { /* Find table entry. */
374 if (strcmp(p
, op
->name
) == 0) { /* If name matches... */
376 if (mask
) /* set the mask and go. */
378 /* If we get here, there was a valid arg with an */
379 /* invalid '-' prefix. */
380 bb_error_msg_and_die("bad: '%s'", p
-1);
384 /* We fell through, so treat as possible hostname. */
385 a1op
= Arg1Opt
+ ARRAY_SIZE(Arg1Opt
) - 1;
386 mask
= op
->arg_flags
;
390 if (mask
& ARG_MASK
) {
391 mask
= op
->arg_flags
;
392 if (mask
& A_NETMASK
& did_flags
)
394 a1op
= Arg1Opt
+ (op
- OptArray
);
395 if (*++argv
== NULL
) {
396 if (mask
& A_ARG_REQ
)
399 mask
&= A_SET_AFTER
; /* just for broadcast */
400 } else { /* got an arg so process it */
402 did_flags
|= (mask
& (A_NETMASK
|A_HOSTNAME
));
403 if (mask
& A_CAST_HOST_COPY
) {
404 #if ENABLE_FEATURE_IFCONFIG_HW
405 if (mask
& A_CAST_RESOLVE
) {
408 if (strcmp(host
, "inet") == 0)
409 continue; /* compat stuff */
410 sai
.sin_family
= AF_INET
;
412 if (strcmp(host
, "default") == 0) {
413 /* Default is special, meaning 0.0.0.0. */
414 sai
.sin_addr
.s_addr
= INADDR_ANY
;
416 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
417 else if ((host
[0] == '+' && !host
[1])
418 && (mask
& A_BROADCAST
)
419 && (did_flags
& (A_NETMASK
|A_HOSTNAME
)) == (A_NETMASK
|A_HOSTNAME
)
421 /* + is special, meaning broadcast is derived. */
422 sai
.sin_addr
.s_addr
= (~sai_netmask
) | (sai_hostname
& sai_netmask
);
426 len_and_sockaddr
*lsa
;
427 #if ENABLE_FEATURE_IPV6
430 prefix
= strchr(host
, '/');
432 prefix_len
= xatou_range(prefix
+ 1, 0, 128);
437 lsa
= xhost2sockaddr(host
, 0);
438 #if ENABLE_FEATURE_IPV6
439 if (lsa
->u
.sa
.sa_family
!= AF_INET6
&& prefix
) {
440 /* TODO: we do not support "ifconfig eth0 up 1.2.3.4/17".
441 * For now, just make it fail instead of silently ignoring "/17" part:
446 if (lsa
->u
.sa
.sa_family
== AF_INET6
) {
448 struct in6_ifreq ifr6
;
450 sockfd6
= xsocket(AF_INET6
, SOCK_DGRAM
, 0);
451 xioctl(sockfd6
, SIOCGIFINDEX
, &ifr
);
452 ifr6
.ifr6_ifindex
= ifr
.ifr_ifindex
;
453 ifr6
.ifr6_prefixlen
= prefix_len
;
454 memcpy(&ifr6
.ifr6_addr
,
455 &lsa
->u
.sin6
.sin6_addr
,
456 sizeof(struct in6_addr
));
457 ioctl_or_perror_and_die(sockfd6
, a1op
->selector
, &ifr6
, "SIOC%s", a1op
->name
);
458 if (ENABLE_FEATURE_CLEAN_UP
)
463 sai
.sin_addr
= lsa
->u
.sin
.sin_addr
;
464 if (ENABLE_FEATURE_CLEAN_UP
)
467 #if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
468 if (mask
& A_HOSTNAME
)
469 sai_hostname
= sai
.sin_addr
.s_addr
;
470 if (mask
& A_NETMASK
)
471 sai_netmask
= sai
.sin_addr
.s_addr
;
474 #if ENABLE_FEATURE_IFCONFIG_HW
475 } else { /* A_CAST_HOST_COPY_IN_ETHER */
476 /* This is the "hw" arg case. */
477 smalluint hw_class
= index_in_substrings("ether\0"
478 IF_FEATURE_HWIB("infiniband\0"), *argv
) + 1;
479 if (!hw_class
|| !*++argv
)
482 if (hw_class
== 1 ? in_ether(host
, &sa
) : in_ib(host
, &sa
))
483 bb_error_msg_and_die("invalid hw-addr %s", host
);
487 memcpy( ((char *)&ifr
) + a1op
->ifr_offset
,
488 p
, sizeof(struct sockaddr
));
490 /* FIXME: error check?? */
491 unsigned long i
= strtoul(*argv
, NULL
, 0);
492 p
= ((char *)&ifr
) + a1op
->ifr_offset
;
493 #if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
494 if (mask
& A_MAP_TYPE
) {
495 xioctl(sockfd
, SIOCGIFMAP
, &ifr
);
496 if ((mask
& A_MAP_UCHAR
) == A_MAP_UCHAR
)
497 *(unsigned char *) p
= i
;
498 else if (mask
& A_MAP_USHORT
)
499 *(unsigned short *) p
= i
;
501 *(unsigned long *) p
= i
;
504 if (mask
& A_CAST_CHAR_PTR
)
505 *(caddr_t
*) p
= (caddr_t
) i
;
506 else /* A_CAST_INT */
510 ioctl_or_perror_and_die(sockfd
, a1op
->selector
, &ifr
, "SIOC%s", a1op
->name
);
511 #ifdef QUESTIONABLE_ALIAS_CASE
512 if (mask
& A_COLON_CHK
) {
514 * Don't do the set_flag() if the address is an alias with
515 * a '-' at the end, since it's deleted already! - Roman
517 * Should really use regex.h here, not sure though how well
518 * it'll go with the cross-platform support etc.
521 short int found_colon
= 0;
522 for (ptr
= ifr
.ifr_name
; *ptr
; ptr
++)
525 if (found_colon
&& ptr
[-1] == '-')
530 if (!(mask
& A_SET_AFTER
))
533 } /* if (mask & ARG_MASK) */
535 xioctl(sockfd
, SIOCGIFFLAGS
, &ifr
);
536 selector
= op
->selector
;
538 ifr
.ifr_flags
|= selector
;
540 ifr
.ifr_flags
&= ~selector
;
541 xioctl(sockfd
, SIOCSIFFLAGS
, &ifr
);
544 if (ENABLE_FEATURE_CLEAN_UP
)