1 /* vi: set sw=4 ts=4: */
3 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 #include <net/if_packet.h>
9 #include <netpacket/packet.h>
10 #include <netinet/if_ether.h>
12 #include "ip_common.h" /* #include "libbb.h" is inside */
17 # define IFLA_LINKINFO 18
18 # define IFLA_INFO_KIND 1
21 /* taken from linux/sockios.h */
22 #define SIOCSIFNAME 0x8923 /* set interface name */
25 static int get_ctl_fd(void)
29 fd = socket(PF_INET, SOCK_DGRAM, 0);
32 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
35 return xsocket(PF_INET6, SOCK_DGRAM, 0);
39 static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
44 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
46 xioctl(fd, SIOCGIFFLAGS, &ifr);
47 if ((ifr.ifr_flags ^ flags) & mask) {
48 ifr.ifr_flags &= ~mask;
49 ifr.ifr_flags |= mask & flags;
50 xioctl(fd, SIOCSIFFLAGS, &ifr);
56 static void do_changename(char *dev, char *newdev)
61 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
62 strncpy_IFNAMSIZ(ifr.ifr_newname, newdev);
64 xioctl(fd, SIOCSIFNAME, &ifr);
69 static void set_qlen(char *dev, int qlen)
75 memset(&ifr, 0, sizeof(ifr));
76 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
78 xioctl(s, SIOCSIFTXQLEN, &ifr);
83 static void set_mtu(char *dev, int mtu)
89 memset(&ifr, 0, sizeof(ifr));
90 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
92 xioctl(s, SIOCSIFMTU, &ifr);
97 static int get_address(char *dev, int *htype)
100 struct sockaddr_ll me;
104 s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
106 memset(&ifr, 0, sizeof(ifr));
107 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
108 xioctl(s, SIOCGIFINDEX, &ifr);
110 memset(&me, 0, sizeof(me));
111 me.sll_family = AF_PACKET;
112 me.sll_ifindex = ifr.ifr_ifindex;
113 me.sll_protocol = htons(ETH_P_LOOP);
114 xbind(s, (struct sockaddr*)&me, sizeof(me));
116 getsockname(s, (struct sockaddr*)&me, &alen);
118 //if (getsockname(s, (struct sockaddr*)&me, &alen) == -1)
119 // bb_perror_msg_and_die("getsockname");
121 *htype = me.sll_hatype;
126 static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
130 memset(ifr, 0, sizeof(*ifr));
131 strncpy_IFNAMSIZ(ifr->ifr_name, dev);
132 ifr->ifr_hwaddr.sa_family = hatype;
134 alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/;
135 alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), alen, lla);
139 bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
144 static void set_address(struct ifreq *ifr, int brd)
150 xioctl(s, SIOCSIFHWBROADCAST, ifr);
152 xioctl(s, SIOCSIFHWADDR, ifr);
157 static void die_must_be_on_off(const char *msg) NORETURN;
158 static void die_must_be_on_off(const char *msg)
160 bb_error_msg_and_die("argument of \"%s\" must be \"on\" or \"off\"", msg);
163 /* Return value becomes exitcode. It's okay to not return at all */
164 static int do_set(char **argv)
171 char *newaddr = NULL;
173 struct ifreq ifr0, ifr1;
174 char *newname = NULL;
176 static const char keywords[] ALIGN1 =
177 "up\0""down\0""name\0""mtu\0""qlen\0""multicast\0"
178 "arp\0""address\0""dev\0";
179 enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_qlen, ARG_multicast,
180 ARG_arp, ARG_addr, ARG_dev };
181 static const char str_on_off[] ALIGN1 = "on\0""off\0";
182 enum { PARM_on = 0, PARM_off };
186 /* substring search ensures that e.g. "addr" and "address"
187 * are both accepted */
188 key = index_in_substrings(keywords, *argv);
192 } else if (key == ARG_down) {
195 } else if (key == ARG_name) {
198 } else if (key == ARG_mtu) {
201 duparg("mtu", *argv);
202 mtu = get_unsigned(*argv, "mtu");
203 } else if (key == ARG_qlen) {
206 duparg("qlen", *argv);
207 qlen = get_unsigned(*argv, "qlen");
208 } else if (key == ARG_addr) {
211 } else if (key >= ARG_dev) {
212 if (key == ARG_dev) {
216 duparg2("dev", *argv);
221 param = index_in_strings(str_on_off, *argv);
222 if (key == ARG_multicast) {
224 die_must_be_on_off("multicast");
225 mask |= IFF_MULTICAST;
226 if (param == PARM_on)
227 flags |= IFF_MULTICAST;
229 flags &= ~IFF_MULTICAST;
230 } else if (key == ARG_arp) {
232 die_must_be_on_off("arp");
234 if (param == PARM_on)
244 bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
247 if (newaddr || newbrd) {
248 halen = get_address(dev, &htype);
250 parse_address(dev, htype, halen, newaddr, &ifr0);
251 set_address(&ifr0, 0);
254 parse_address(dev, htype, halen, newbrd, &ifr1);
255 set_address(&ifr1, 1);
259 if (newname && strcmp(dev, newname)) {
260 do_changename(dev, newname);
270 do_chflags(dev, flags, mask);
274 static int ipaddr_list_link(char **argv)
276 preferred_family = AF_PACKET;
277 return ipaddr_list_or_flush(argv, 0);
281 #define NLMSG_TAIL(nmsg) \
282 ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
284 /* Return value becomes exitcode. It's okay to not return at all */
285 static int do_change(char **argv, const unsigned rtm)
287 static const char keywords[] ALIGN1 =
288 "link\0""name\0""type\0""dev\0";
295 struct rtnl_handle rth;
302 char *name_str = NULL, *link_str = NULL, *type_str = NULL, *dev_str = NULL;
304 memset(&req, 0, sizeof(req));
306 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
307 req.n.nlmsg_flags = NLM_F_REQUEST;
308 req.n.nlmsg_type = rtm;
309 req.i.ifi_family = preferred_family;
310 if (rtm == RTM_NEWLINK)
311 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
314 arg = index_in_substrings(keywords, *argv);
315 if (arg == ARG_link) {
318 } else if (arg == ARG_name) {
321 } else if (arg == ARG_type) {
325 if (arg == ARG_dev) {
327 duparg(*argv, "dev");
337 struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
339 addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
340 addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type_str,
342 linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
344 if (rtm != RTM_NEWLINK) {
346 return 1; /* Need a device to delete */
347 req.i.ifi_index = xll_name_to_index(dev_str);
352 int idx = xll_name_to_index(link_str);
353 addattr_l(&req.n, sizeof(req), IFLA_LINK, &idx, 4);
357 const size_t name_len = strlen(name_str) + 1;
358 if (name_len < 2 || name_len > IFNAMSIZ)
359 invarg(name_str, "name");
360 addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name_str, name_len);
362 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
367 /* Return value becomes exitcode. It's okay to not return at all */
368 int FAST_FUNC do_iplink(char **argv)
370 static const char keywords[] ALIGN1 =
371 "add\0""delete\0""set\0""show\0""lst\0""list\0";
373 smalluint key = index_in_substrings(keywords, *argv);
374 if (key > 5) /* invalid argument */
375 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
377 if (key <= 1) /* add/delete */
378 return do_change(argv, key ? RTM_DELLINK : RTM_NEWLINK);
379 else if (key == 2) /* set */
382 /* show, lst, list */
383 return ipaddr_list_link(argv);