]>
git.proxmox.com Git - mirror_iproute2.git/blob - ip/iplink.c
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
20 #include <sys/socket.h>
22 #include <linux/if_packet.h>
23 #include <linux/if_ether.h>
24 #include <linux/sockios.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
28 #include <sys/ioctl.h>
29 #include <linux/sockios.h>
33 #include "ip_common.h"
35 #define IPLINK_IOCTL_COMPAT 1
37 static void usage(void) __attribute__((noreturn
));
39 void iplink_usage(void)
41 fprintf(stderr
, "Usage: ip link set DEVICE { up | down |\n");
42 fprintf(stderr
, " arp { on | off } |\n");
43 fprintf(stderr
, " dynamic { on | off } |\n");
44 fprintf(stderr
, " multicast { on | off } |\n");
45 fprintf(stderr
, " allmulticast { on | off } |\n");
46 fprintf(stderr
, " promisc { on | off } |\n");
47 fprintf(stderr
, " trailers { on | off } |\n");
48 fprintf(stderr
, " txqueuelen PACKETS |\n");
49 fprintf(stderr
, " name NEWNAME |\n");
50 fprintf(stderr
, " address LLADDR | broadcast LLADDR |\n");
51 fprintf(stderr
, " mtu MTU }\n");
52 fprintf(stderr
, " ip link show [ DEVICE ]\n");
56 static void usage(void)
61 static int on_off(char *msg
)
63 fprintf(stderr
, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg
);
67 static void *BODY
; /* cached dlopen(NULL) handle */
68 static struct link_util
*linkutil_list
;
70 struct link_util
*get_link_kind(const char *id
)
76 for (l
= linkutil_list
; l
; l
= l
->next
)
77 if (strcmp(l
->id
, id
) == 0)
80 snprintf(buf
, sizeof(buf
), "/usr/lib/ip/link_%s.so", id
);
81 dlh
= dlopen(buf
, RTLD_LAZY
);
83 /* look in current binary, only open once */
86 dlh
= BODY
= dlopen(NULL
, RTLD_LAZY
);
92 snprintf(buf
, sizeof(buf
), "%s_link_util", id
);
97 l
->next
= linkutil_list
;
102 #if IPLINK_IOCTL_COMPAT
103 static int have_rtnl_newlink
= -1;
105 static int accept_msg(const struct sockaddr_nl
*who
,
106 struct nlmsghdr
*n
, void *arg
)
108 struct nlmsgerr
*err
= (struct nlmsgerr
*)NLMSG_DATA(n
);
110 if (n
->nlmsg_type
== NLMSG_ERROR
&&
111 (err
->error
== -EOPNOTSUPP
|| err
->error
== -EINVAL
))
112 have_rtnl_newlink
= 0;
114 have_rtnl_newlink
= 1;
118 static int iplink_have_newlink(void)
126 if (have_rtnl_newlink
< 0) {
127 memset(&req
, 0, sizeof(req
));
129 req
.n
.nlmsg_len
= NLMSG_LENGTH(sizeof(struct ifinfomsg
));
130 req
.n
.nlmsg_flags
= NLM_F_REQUEST
|NLM_F_ACK
;
131 req
.n
.nlmsg_type
= RTM_NEWLINK
;
132 req
.i
.ifi_family
= AF_UNSPEC
;
134 rtnl_send(&rth
, (char *)&req
.n
, req
.n
.nlmsg_len
);
135 rtnl_listen(&rth
, accept_msg
, NULL
);
137 return have_rtnl_newlink
;
139 #else /* IPLINK_IOCTL_COMPAT */
140 static int iplink_have_newlink(void)
144 #endif /* ! IPLINK_IOCTL_COMPAT */
152 int iplink_parse(int argc
, char **argv
, struct iplink_req
*req
,
153 char **name
, char **type
, char **link
, char **dev
)
163 if (strcmp(*argv
, "up") == 0) {
164 req
->i
.ifi_change
|= IFF_UP
;
165 req
->i
.ifi_flags
|= IFF_UP
;
166 } else if (strcmp(*argv
, "down") == 0) {
167 req
->i
.ifi_change
|= IFF_UP
;
168 req
->i
.ifi_flags
&= ~IFF_UP
;
169 } else if (strcmp(*argv
, "name") == 0) {
172 } else if (matches(*argv
, "link") == 0) {
175 } else if (matches(*argv
, "address") == 0) {
177 len
= ll_addr_a2n(abuf
, sizeof(abuf
), *argv
);
178 addattr_l(&req
->n
, sizeof(*req
), IFLA_ADDRESS
, abuf
, len
);
179 } else if (matches(*argv
, "broadcast") == 0 ||
180 strcmp(*argv
, "brd") == 0) {
182 len
= ll_addr_a2n(abuf
, sizeof(abuf
), *argv
);
183 addattr_l(&req
->n
, sizeof(*req
), IFLA_BROADCAST
, abuf
, len
);
184 } else if (matches(*argv
, "txqueuelen") == 0 ||
185 strcmp(*argv
, "qlen") == 0 ||
186 matches(*argv
, "txqlen") == 0) {
189 duparg("txqueuelen", *argv
);
190 if (get_integer(&qlen
, *argv
, 0))
191 invarg("Invalid \"txqueuelen\" value\n", *argv
);
192 addattr_l(&req
->n
, sizeof(*req
), IFLA_TXQLEN
, &qlen
, 4);
193 } else if (strcmp(*argv
, "mtu") == 0) {
196 duparg("mtu", *argv
);
197 if (get_integer(&mtu
, *argv
, 0))
198 invarg("Invalid \"mtu\" value\n", *argv
);
199 addattr_l(&req
->n
, sizeof(*req
), IFLA_MTU
, &mtu
, 4);
200 } else if (strcmp(*argv
, "multicast") == 0) {
202 req
->i
.ifi_change
|= IFF_MULTICAST
;
203 if (strcmp(*argv
, "on") == 0) {
204 req
->i
.ifi_flags
|= IFF_MULTICAST
;
205 } else if (strcmp(*argv
, "off") == 0) {
206 req
->i
.ifi_flags
&= ~IFF_MULTICAST
;
208 return on_off("multicast");
209 } else if (strcmp(*argv
, "allmulticast") == 0) {
211 req
->i
.ifi_change
|= IFF_ALLMULTI
;
212 if (strcmp(*argv
, "on") == 0) {
213 req
->i
.ifi_flags
|= IFF_ALLMULTI
;
214 } else if (strcmp(*argv
, "off") == 0) {
215 req
->i
.ifi_flags
&= ~IFF_ALLMULTI
;
217 return on_off("allmulticast");
218 } else if (strcmp(*argv
, "promisc") == 0) {
220 req
->i
.ifi_change
|= IFF_PROMISC
;
221 if (strcmp(*argv
, "on") == 0) {
222 req
->i
.ifi_flags
|= IFF_PROMISC
;
223 } else if (strcmp(*argv
, "off") == 0) {
224 req
->i
.ifi_flags
&= ~IFF_PROMISC
;
226 return on_off("promisc");
227 } else if (strcmp(*argv
, "trailers") == 0) {
229 req
->i
.ifi_change
|= IFF_NOTRAILERS
;
230 if (strcmp(*argv
, "off") == 0) {
231 req
->i
.ifi_flags
|= IFF_NOTRAILERS
;
232 } else if (strcmp(*argv
, "on") == 0) {
233 req
->i
.ifi_flags
&= ~IFF_NOTRAILERS
;
235 return on_off("trailers");
236 } else if (strcmp(*argv
, "arp") == 0) {
238 req
->i
.ifi_change
|= IFF_NOARP
;
239 if (strcmp(*argv
, "on") == 0) {
240 req
->i
.ifi_flags
&= ~IFF_NOARP
;
241 } else if (strcmp(*argv
, "off") == 0) {
242 req
->i
.ifi_flags
|= IFF_NOARP
;
244 return on_off("noarp");
246 } else if (matches(*argv
, "dynamic") == 0) {
248 req
->i
.ifi_change
|= IFF_DYNAMIC
;
249 if (strcmp(*argv
, "on") == 0) {
250 req
->i
.ifi_flags
|= IFF_DYNAMIC
;
251 } else if (strcmp(*argv
, "off") == 0) {
252 req
->i
.ifi_flags
&= ~IFF_DYNAMIC
;
254 return on_off("dynamic");
256 } else if (matches(*argv
, "type") == 0) {
262 if (strcmp(*argv
, "dev") == 0) {
266 duparg2("dev", *argv
);
275 static int iplink_modify(int cmd
, unsigned int flags
, int argc
, char **argv
)
282 struct link_util
*lu
= NULL
;
283 struct iplink_req req
;
286 memset(&req
, 0, sizeof(req
));
288 req
.n
.nlmsg_len
= NLMSG_LENGTH(sizeof(struct ifinfomsg
));
289 req
.n
.nlmsg_flags
= NLM_F_REQUEST
|flags
;
290 req
.n
.nlmsg_type
= cmd
;
291 req
.i
.ifi_family
= preferred_family
;
293 ret
= iplink_parse(argc
, argv
, &req
, &name
, &type
, &link
, &dev
);
302 struct rtattr
*linkinfo
= NLMSG_TAIL(&req
.n
);
303 addattr_l(&req
.n
, sizeof(req
), IFLA_LINKINFO
, NULL
, 0);
304 addattr_l(&req
.n
, sizeof(req
), IFLA_INFO_KIND
, type
,
307 lu
= get_link_kind(type
);
309 struct rtattr
* data
= NLMSG_TAIL(&req
.n
);
310 addattr_l(&req
.n
, sizeof(req
), IFLA_INFO_DATA
, NULL
, 0);
313 lu
->parse_opt(lu
, argc
, argv
, &req
.n
))
316 data
->rta_len
= (void *)NLMSG_TAIL(&req
.n
) - (void *)data
;
318 if (matches(*argv
, "help") == 0)
320 fprintf(stderr
, "Garbage instead of arguments \"%s ...\". "
321 "Try \"ip link help\".\n", *argv
);
324 linkinfo
->rta_len
= (void *)NLMSG_TAIL(&req
.n
) - (void *)linkinfo
;
327 if (!(flags
& NLM_F_CREATE
)) {
329 fprintf(stderr
, "Not enough information: \"dev\" "
330 "argument is required.\n");
334 req
.i
.ifi_index
= ll_name_to_index(dev
);
335 if (req
.i
.ifi_index
== 0) {
336 fprintf(stderr
, "Cannot find device \"%s\"\n", dev
);
340 /* Allow "ip link add dev" and "ip link add name" */
347 ifindex
= ll_name_to_index(link
);
349 fprintf(stderr
, "Cannot find device \"%s\"\n",
353 addattr_l(&req
.n
, sizeof(req
), IFLA_LINK
, &ifindex
, 4);
358 len
= strlen(name
) + 1;
360 invarg("\"\" is not a valid device identifier\n", "name");
362 invarg("\"name\" too long\n", name
);
363 addattr_l(&req
.n
, sizeof(req
), IFLA_IFNAME
, name
, len
);
366 if (rtnl_talk(&rth
, &req
.n
, 0, 0, NULL
, NULL
, NULL
) < 0)
372 #if IPLINK_IOCTL_COMPAT
373 static int get_ctl_fd(void)
378 fd
= socket(PF_INET
, SOCK_DGRAM
, 0);
382 fd
= socket(PF_PACKET
, SOCK_DGRAM
, 0);
385 fd
= socket(PF_INET6
, SOCK_DGRAM
, 0);
389 perror("Cannot create control socket");
393 static int do_chflags(const char *dev
, __u32 flags
, __u32 mask
)
399 strncpy(ifr
.ifr_name
, dev
, IFNAMSIZ
);
403 err
= ioctl(fd
, SIOCGIFFLAGS
, &ifr
);
405 perror("SIOCGIFFLAGS");
409 if ((ifr
.ifr_flags
^flags
)&mask
) {
410 ifr
.ifr_flags
&= ~mask
;
411 ifr
.ifr_flags
|= mask
&flags
;
412 err
= ioctl(fd
, SIOCSIFFLAGS
, &ifr
);
414 perror("SIOCSIFFLAGS");
420 static int do_changename(const char *dev
, const char *newdev
)
426 strncpy(ifr
.ifr_name
, dev
, IFNAMSIZ
);
427 strncpy(ifr
.ifr_newname
, newdev
, IFNAMSIZ
);
431 err
= ioctl(fd
, SIOCSIFNAME
, &ifr
);
433 perror("SIOCSIFNAME");
441 static int set_qlen(const char *dev
, int qlen
)
450 memset(&ifr
, 0, sizeof(ifr
));
451 strncpy(ifr
.ifr_name
, dev
, IFNAMSIZ
);
453 if (ioctl(s
, SIOCSIFTXQLEN
, &ifr
) < 0) {
454 perror("SIOCSIFXQLEN");
463 static int set_mtu(const char *dev
, int mtu
)
472 memset(&ifr
, 0, sizeof(ifr
));
473 strncpy(ifr
.ifr_name
, dev
, IFNAMSIZ
);
475 if (ioctl(s
, SIOCSIFMTU
, &ifr
) < 0) {
476 perror("SIOCSIFMTU");
485 static int get_address(const char *dev
, int *htype
)
488 struct sockaddr_ll me
;
492 s
= socket(PF_PACKET
, SOCK_DGRAM
, 0);
494 perror("socket(PF_PACKET)");
498 memset(&ifr
, 0, sizeof(ifr
));
499 strncpy(ifr
.ifr_name
, dev
, IFNAMSIZ
);
500 if (ioctl(s
, SIOCGIFINDEX
, &ifr
) < 0) {
501 perror("SIOCGIFINDEX");
506 memset(&me
, 0, sizeof(me
));
507 me
.sll_family
= AF_PACKET
;
508 me
.sll_ifindex
= ifr
.ifr_ifindex
;
509 me
.sll_protocol
= htons(ETH_P_LOOP
);
510 if (bind(s
, (struct sockaddr
*)&me
, sizeof(me
)) == -1) {
517 if (getsockname(s
, (struct sockaddr
*)&me
, &alen
) == -1) {
518 perror("getsockname");
523 *htype
= me
.sll_hatype
;
527 static int parse_address(const char *dev
, int hatype
, int halen
,
528 char *lla
, struct ifreq
*ifr
)
532 memset(ifr
, 0, sizeof(*ifr
));
533 strncpy(ifr
->ifr_name
, dev
, IFNAMSIZ
);
534 ifr
->ifr_hwaddr
.sa_family
= hatype
;
535 alen
= ll_addr_a2n(ifr
->ifr_hwaddr
.sa_data
, 14, lla
);
539 fprintf(stderr
, "Wrong address (%s) length: expected %d bytes\n", lla
, halen
);
545 static int set_address(struct ifreq
*ifr
, int brd
)
552 if (ioctl(s
, brd
?SIOCSIFHWBROADCAST
:SIOCSIFHWADDR
, ifr
) < 0) {
553 perror(brd
?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
562 static int do_set(int argc
, char **argv
)
569 char *newaddr
= NULL
;
571 struct ifreq ifr0
, ifr1
;
572 char *newname
= NULL
;
576 if (strcmp(*argv
, "up") == 0) {
579 } else if (strcmp(*argv
, "down") == 0) {
582 } else if (strcmp(*argv
, "name") == 0) {
585 } else if (matches(*argv
, "address") == 0) {
588 } else if (matches(*argv
, "broadcast") == 0 ||
589 strcmp(*argv
, "brd") == 0) {
592 } else if (matches(*argv
, "txqueuelen") == 0 ||
593 strcmp(*argv
, "qlen") == 0 ||
594 matches(*argv
, "txqlen") == 0) {
597 duparg("txqueuelen", *argv
);
598 if (get_integer(&qlen
, *argv
, 0))
599 invarg("Invalid \"txqueuelen\" value\n", *argv
);
600 } else if (strcmp(*argv
, "mtu") == 0) {
603 duparg("mtu", *argv
);
604 if (get_integer(&mtu
, *argv
, 0))
605 invarg("Invalid \"mtu\" value\n", *argv
);
606 } else if (strcmp(*argv
, "multicast") == 0) {
608 mask
|= IFF_MULTICAST
;
609 if (strcmp(*argv
, "on") == 0) {
610 flags
|= IFF_MULTICAST
;
611 } else if (strcmp(*argv
, "off") == 0) {
612 flags
&= ~IFF_MULTICAST
;
614 return on_off("multicast");
615 } else if (strcmp(*argv
, "allmulticast") == 0) {
617 mask
|= IFF_ALLMULTI
;
618 if (strcmp(*argv
, "on") == 0) {
619 flags
|= IFF_ALLMULTI
;
620 } else if (strcmp(*argv
, "off") == 0) {
621 flags
&= ~IFF_ALLMULTI
;
623 return on_off("allmulticast");
624 } else if (strcmp(*argv
, "promisc") == 0) {
627 if (strcmp(*argv
, "on") == 0) {
628 flags
|= IFF_PROMISC
;
629 } else if (strcmp(*argv
, "off") == 0) {
630 flags
&= ~IFF_PROMISC
;
632 return on_off("promisc");
633 } else if (strcmp(*argv
, "trailers") == 0) {
635 mask
|= IFF_NOTRAILERS
;
636 if (strcmp(*argv
, "off") == 0) {
637 flags
|= IFF_NOTRAILERS
;
638 } else if (strcmp(*argv
, "on") == 0) {
639 flags
&= ~IFF_NOTRAILERS
;
641 return on_off("trailers");
642 } else if (strcmp(*argv
, "arp") == 0) {
645 if (strcmp(*argv
, "on") == 0) {
647 } else if (strcmp(*argv
, "off") == 0) {
650 return on_off("noarp");
652 } else if (matches(*argv
, "dynamic") == 0) {
655 if (strcmp(*argv
, "on") == 0) {
656 flags
|= IFF_DYNAMIC
;
657 } else if (strcmp(*argv
, "off") == 0) {
658 flags
&= ~IFF_DYNAMIC
;
660 return on_off("dynamic");
663 if (strcmp(*argv
, "dev") == 0) {
666 if (matches(*argv
, "help") == 0)
669 duparg2("dev", *argv
);
676 fprintf(stderr
, "Not enough of information: \"dev\" argument is required.\n");
680 if (newaddr
|| newbrd
) {
681 halen
= get_address(dev
, &htype
);
685 if (parse_address(dev
, htype
, halen
, newaddr
, &ifr0
) < 0)
689 if (parse_address(dev
, htype
, halen
, newbrd
, &ifr1
) < 0)
694 if (newname
&& strcmp(dev
, newname
)) {
695 if (strlen(newname
) == 0)
696 invarg("\"\" is not a valid device identifier\n", "name");
697 if (do_changename(dev
, newname
) < 0)
702 if (set_qlen(dev
, qlen
) < 0)
706 if (set_mtu(dev
, mtu
) < 0)
709 if (newaddr
|| newbrd
) {
711 if (set_address(&ifr1
, 1) < 0)
715 if (set_address(&ifr0
, 0) < 0)
720 return do_chflags(dev
, flags
, mask
);
723 #endif /* IPLINK_IOCTL_COMPAT */
725 int do_iplink(int argc
, char **argv
)
728 if (iplink_have_newlink()) {
729 if (matches(*argv
, "add") == 0)
730 return iplink_modify(RTM_NEWLINK
,
731 NLM_F_CREATE
|NLM_F_EXCL
,
733 if (matches(*argv
, "set") == 0 ||
734 matches(*argv
, "change") == 0)
735 return iplink_modify(RTM_NEWLINK
, 0,
737 if (matches(*argv
, "replace") == 0)
738 return iplink_modify(RTM_NEWLINK
,
739 NLM_F_CREATE
|NLM_F_REPLACE
,
741 if (matches(*argv
, "delete") == 0)
742 return iplink_modify(RTM_DELLINK
, 0,
745 #if IPLINK_IOCTL_COMPAT
746 if (matches(*argv
, "set") == 0)
747 return do_set(argc
-1, argv
+1);
750 if (matches(*argv
, "show") == 0 ||
751 matches(*argv
, "lst") == 0 ||
752 matches(*argv
, "list") == 0)
753 return ipaddr_list_link(argc
-1, argv
+1);
754 if (matches(*argv
, "help") == 0)
757 return ipaddr_list_link(0, NULL
);
759 fprintf(stderr
, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv
);