1 /* vi: set sw=4 ts=4: */
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 #include <net/if_packet.h>
11 #include <netpacket/packet.h>
12 #include <net/ethernet.h>
14 #include "ip_common.h" /* #include "libbb.h" is inside */
18 /* taken from linux/sockios.h */
19 #define SIOCSIFNAME 0x8923 /* set interface name */
22 static int get_ctl_fd(void)
26 fd = socket(PF_INET, SOCK_DGRAM, 0);
29 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
32 return xsocket(PF_INET6, SOCK_DGRAM, 0);
36 static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
41 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
43 xioctl(fd, SIOCGIFFLAGS, &ifr);
44 if ((ifr.ifr_flags ^ flags) & mask) {
45 ifr.ifr_flags &= ~mask;
46 ifr.ifr_flags |= mask & flags;
47 xioctl(fd, SIOCSIFFLAGS, &ifr);
53 static void do_changename(char *dev, char *newdev)
58 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
59 strncpy_IFNAMSIZ(ifr.ifr_newname, newdev);
61 xioctl(fd, SIOCSIFNAME, &ifr);
66 static void set_qlen(char *dev, int qlen)
72 memset(&ifr, 0, sizeof(ifr));
73 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
75 xioctl(s, SIOCSIFTXQLEN, &ifr);
80 static void set_mtu(char *dev, int mtu)
86 memset(&ifr, 0, sizeof(ifr));
87 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
89 xioctl(s, SIOCSIFMTU, &ifr);
94 static int get_address(char *dev, int *htype)
97 struct sockaddr_ll me;
101 s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
103 memset(&ifr, 0, sizeof(ifr));
104 strncpy_IFNAMSIZ(ifr.ifr_name, dev);
105 xioctl(s, SIOCGIFINDEX, &ifr);
107 memset(&me, 0, sizeof(me));
108 me.sll_family = AF_PACKET;
109 me.sll_ifindex = ifr.ifr_ifindex;
110 me.sll_protocol = htons(ETH_P_LOOP);
111 xbind(s, (struct sockaddr*)&me, sizeof(me));
113 getsockname(s, (struct sockaddr*)&me, &alen);
115 //if (getsockname(s, (struct sockaddr*)&me, &alen) == -1)
116 // bb_perror_msg_and_die("getsockname");
118 *htype = me.sll_hatype;
123 static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
127 memset(ifr, 0, sizeof(*ifr));
128 strncpy_IFNAMSIZ(ifr->ifr_name, dev);
129 ifr->ifr_hwaddr.sa_family = hatype;
131 alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/;
132 alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), alen, lla);
136 bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
141 static void set_address(struct ifreq *ifr, int brd)
147 xioctl(s, SIOCSIFHWBROADCAST, ifr);
149 xioctl(s, SIOCSIFHWADDR, ifr);
154 static void die_must_be_on_off(const char *msg) NORETURN;
155 static void die_must_be_on_off(const char *msg)
157 bb_error_msg_and_die("argument of \"%s\" must be \"on\" or \"off\"", msg);
160 /* Return value becomes exitcode. It's okay to not return at all */
161 static int do_set(char **argv)
168 char *newaddr = NULL;
170 struct ifreq ifr0, ifr1;
171 char *newname = NULL;
173 static const char keywords[] ALIGN1 =
174 "up\0""down\0""name\0""mtu\0""multicast\0"
175 "arp\0""address\0""dev\0";
176 enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_multicast,
177 ARG_arp, ARG_addr, ARG_dev };
178 static const char str_on_off[] ALIGN1 = "on\0""off\0";
179 enum { PARM_on = 0, PARM_off };
183 /* substring search ensures that e.g. "addr" and "address"
184 * are both accepted */
185 key = index_in_substrings(keywords, *argv);
190 if (key == ARG_down) {
194 if (key == ARG_name) {
198 if (key == ARG_mtu) {
201 duparg("mtu", *argv);
202 mtu = get_unsigned(*argv, "mtu");
204 if (key == ARG_multicast) {
207 mask |= IFF_MULTICAST;
208 param = index_in_strings(str_on_off, *argv);
210 die_must_be_on_off("multicast");
211 if (param == PARM_on)
212 flags |= IFF_MULTICAST;
214 flags &= ~IFF_MULTICAST;
216 if (key == ARG_arp) {
220 param = index_in_strings(str_on_off, *argv);
222 die_must_be_on_off("arp");
223 if (param == PARM_on)
228 if (key == ARG_addr) {
232 if (key >= ARG_dev) {
233 if (key == ARG_dev) {
237 duparg2("dev", *argv);
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);
253 parse_address(dev, htype, halen, newbrd, &ifr1);
257 if (newname && strcmp(dev, newname)) {
258 do_changename(dev, newname);
267 if (newaddr || newbrd) {
269 set_address(&ifr1, 1);
272 set_address(&ifr0, 0);
276 do_chflags(dev, flags, mask);
280 static int ipaddr_list_link(char **argv)
282 preferred_family = AF_PACKET;
283 return ipaddr_list_or_flush(argv, 0);
287 #define NLMSG_TAIL(nmsg) \
288 ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
290 /* Return value becomes exitcode. It's okay to not return at all */
291 static int do_change(char **argv, const unsigned rtm)
293 static const char keywords[] ALIGN1 =
294 "link\0""name\0""type\0""dev\0";
301 struct rtnl_handle rth;
308 char *name_str = NULL, *link_str = NULL, *type_str = NULL, *dev_str = NULL;
310 memset(&req, 0, sizeof(req));
312 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
313 req.n.nlmsg_flags = NLM_F_REQUEST;
314 req.n.nlmsg_type = rtm;
315 req.i.ifi_family = preferred_family;
316 if (rtm == RTM_NEWLINK)
317 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
320 arg = index_in_substrings(keywords, *argv);
321 if (arg == ARG_link) {
324 } else if (arg == ARG_name) {
327 } else if (arg == ARG_type) {
331 if (arg == ARG_dev) {
333 duparg(*argv, "dev");
343 struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
345 addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
346 addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type_str,
348 linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
350 if (rtm != RTM_NEWLINK) {
352 return 1; /* Need a device to delete */
353 req.i.ifi_index = xll_name_to_index(dev_str);
358 int idx = xll_name_to_index(link_str);
359 addattr_l(&req.n, sizeof(req), IFLA_LINK, &idx, 4);
363 const size_t name_len = strlen(name_str) + 1;
364 if (name_len < 2 || name_len > IFNAMSIZ)
365 invarg(name_str, "name");
366 addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name_str, name_len);
368 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
373 /* Return value becomes exitcode. It's okay to not return at all */
374 int do_iplink(char **argv)
376 static const char keywords[] ALIGN1 =
377 "add\0""delete\0""set\0""show\0""lst\0""list\0";
380 return ipaddr_list_link(argv);
381 key = index_in_substrings(keywords, *argv);
383 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
385 if (key <= 1) /* add/delete */
386 return do_change(argv, key ? RTM_DELLINK : RTM_NEWLINK);
387 else if (key == 2) /* set */
389 /* show, lst, list */
390 return ipaddr_list_link(argv);