networking/libiproute/iplink.c - busybox - Git at Google

 /* vi: set sw=4 ts=4: */
 /*
  * iplink.c "ip link".
  *
  * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  *
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */

 #include "libbb.h"

 #include <sys/ioctl.h>
 #include <sys/socket.h>

 #include <net/if.h>
 #include <net/if_packet.h>
 #include <netpacket/packet.h>

 #include <net/ethernet.h>

 #include "rt_names.h"
 #include "utils.h"
 #include "ip_common.h"

 /* take from linux/sockios.h */
 #define SIOCSIFNAME	0x8923		/* set interface name */

 static int on_off(const char *msg)
 {
 	bb_error_msg("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
 	return -1;
 }

 static int get_ctl_fd(void)
 {
 	int s_errno;
 	int fd;

 	fd = socket(PF_INET, SOCK_DGRAM, 0);
 	if (fd >= 0)
 		return fd;
 	s_errno = errno;
 	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
 	if (fd >= 0)
 		return fd;
 	fd = socket(PF_INET6, SOCK_DGRAM, 0);
 	if (fd >= 0)
 		return fd;
 	errno = s_errno;
 	bb_perror_msg("cannot create control socket");
 	return -1;
 }

 static int do_chflags(char *dev, uint32_t flags, uint32_t mask)
 {
 	struct ifreq ifr;
 	int fd;
 	int err;

 	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
 	fd = get_ctl_fd();
 	if (fd < 0)
 		return -1;
 	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
 	if (err) {
 		bb_perror_msg("SIOCGIFFLAGS");
 		close(fd);
 		return -1;
 	}
 	if ((ifr.ifr_flags^flags)&mask) {
 		ifr.ifr_flags &= ~mask;
 		ifr.ifr_flags |= mask&flags;
 		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
 		if (err)
 			bb_perror_msg("SIOCSIFFLAGS");
 	}
 	close(fd);
 	return err;
 }

 static int do_changename(char *dev, char *newdev)
 {
 	struct ifreq ifr;
 	int fd;
 	int err;

 	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
 	strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
 	fd = get_ctl_fd();
 	if (fd < 0)
 		return -1;
 	err = ioctl(fd, SIOCSIFNAME, &ifr);
 	if (err) {
 		bb_perror_msg("SIOCSIFNAME");
 		close(fd);
 		return -1;
 	}
 	close(fd);
 	return err;
 }

 static int set_qlen(char *dev, int qlen)
 {
 	struct ifreq ifr;
 	int s;

 	s = get_ctl_fd();
 	if (s < 0)
 		return -1;

 	memset(&ifr, 0, sizeof(ifr));
 	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
 	ifr.ifr_qlen = qlen;
 	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
 		bb_perror_msg("SIOCSIFXQLEN");
 		close(s);
 		return -1;
 	}
 	close(s);

 	return 0;
 }

 static int set_mtu(char *dev, int mtu)
 {
 	struct ifreq ifr;
 	int s;

 	s = get_ctl_fd();
 	if (s < 0)
 		return -1;

 	memset(&ifr, 0, sizeof(ifr));
 	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
 	ifr.ifr_mtu = mtu;
 	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
 		bb_perror_msg("SIOCSIFMTU");
 		close(s);
 		return -1;
 	}
 	close(s);

 	return 0;
 }

 static int get_address(char *dev, int *htype)
 {
 	struct ifreq ifr;
 	struct sockaddr_ll me;
 	socklen_t alen;
 	int s;

 	s = socket(PF_PACKET, SOCK_DGRAM, 0);
 	if (s < 0) {
 		bb_perror_msg("socket(PF_PACKET)");
 		return -1;
 	}

 	memset(&ifr, 0, sizeof(ifr));
 	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
 	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 		bb_perror_msg("SIOCGIFINDEX");
 		close(s);
 		return -1;
 	}

 	memset(&me, 0, sizeof(me));
 	me.sll_family = AF_PACKET;
 	me.sll_ifindex = ifr.ifr_ifindex;
 	me.sll_protocol = htons(ETH_P_LOOP);
 	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
 		bb_perror_msg("bind");
 		close(s);
 		return -1;
 	}

 	alen = sizeof(me);
 	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
 		bb_perror_msg("getsockname");
 		close(s);
 		return -1;
 	}
 	close(s);
 	*htype = me.sll_hatype;
 	return me.sll_halen;
 }

 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
 {
 	int alen;

 	memset(ifr, 0, sizeof(*ifr));
 	strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
 	ifr->ifr_hwaddr.sa_family = hatype;
 	alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
 	if (alen < 0)
 		return -1;
 	if (alen != halen) {
 		bb_error_msg("wrong address (%s) length: expected %d bytes", lla, halen);
 		return -1;
 	}
 	return 0;
 }

 static int set_address(struct ifreq *ifr, int brd)
 {
 	int s;

 	s = get_ctl_fd();
 	if (s < 0)
 		return -1;
 	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
 		bb_perror_msg(brd ? "SIOCSIFHWBROADCAST" : "SIOCSIFHWADDR");
 		close(s);
 		return -1;
 	}
 	close(s);
 	return 0;
 }


 static int do_set(int argc, char **argv)
 {
 	char *dev = NULL;
 	uint32_t mask = 0;
 	uint32_t flags = 0;
 	int qlen = -1;
 	int mtu = -1;
 	char *newaddr = NULL;
 	char *newbrd = NULL;
 	struct ifreq ifr0, ifr1;
 	char *newname = NULL;
 	int htype, halen;

 	while (argc > 0) {
 		if (strcmp(*argv, "up") == 0) {
 			mask |= IFF_UP;
 			flags |= IFF_UP;
 		} else if (strcmp(*argv, "down") == 0) {
 			mask |= IFF_UP;
 			flags &= ~IFF_UP;
 		} else if (strcmp(*argv, "name") == 0) {
 			NEXT_ARG();
 			newname = *argv;
 		} else if (strcmp(*argv, "mtu") == 0) {
 			NEXT_ARG();
 			if (mtu != -1)
 				duparg("mtu", *argv);
 			if (get_integer(&mtu, *argv, 0))
 				invarg(*argv, "mtu");
 		} else if (strcmp(*argv, "multicast") == 0) {
 			NEXT_ARG();
 			mask |= IFF_MULTICAST;
 			if (strcmp(*argv, "on") == 0) {
 				flags |= IFF_MULTICAST;
 			} else if (strcmp(*argv, "off") == 0) {
 				flags &= ~IFF_MULTICAST;
 			} else
 				return on_off("multicast");
 		} else if (strcmp(*argv, "arp") == 0) {
 			NEXT_ARG();
 			mask |= IFF_NOARP;
 			if (strcmp(*argv, "on") == 0) {
 				flags &= ~IFF_NOARP;
 			} else if (strcmp(*argv, "off") == 0) {
 				flags |= IFF_NOARP;
 			} else
 				return on_off("noarp");
 		} else if (strcmp(*argv, "addr") == 0) {
 			NEXT_ARG();
 			newaddr = *argv;
 		} else {
 			if (strcmp(*argv, "dev") == 0) {
 				NEXT_ARG();
 			}
 			if (dev)
 				duparg2("dev", *argv);
 			dev = *argv;
 		}
 		argc--; argv++;
 	}

 	if (!dev) {
 		bb_error_msg(bb_msg_requires_arg, "\"dev\"");
 		exit(-1);
 	}

 	if (newaddr || newbrd) {
 		halen = get_address(dev, &htype);
 		if (halen < 0)
 			return -1;
 		if (newaddr) {
 			if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
 				return -1;
 		}
 		if (newbrd) {
 			if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
 				return -1;
 		}
 	}

 	if (newname && strcmp(dev, newname)) {
 		if (do_changename(dev, newname) < 0)
 			return -1;
 		dev = newname;
 	}
 	if (qlen != -1) {
 		if (set_qlen(dev, qlen) < 0)
 			return -1;
 	}
 	if (mtu != -1) {
 		if (set_mtu(dev, mtu) < 0)
 			return -1;
 	}
 	if (newaddr || newbrd) {
 		if (newbrd) {
 			if (set_address(&ifr1, 1) < 0)
 				return -1;
 		}
 		if (newaddr) {
 			if (set_address(&ifr0, 0) < 0)
 				return -1;
 		}
 	}
 	if (mask)
 		return do_chflags(dev, flags, mask);
 	return 0;
 }

 static int ipaddr_list_link(int argc, char **argv)
 {
 	preferred_family = AF_PACKET;
 	return ipaddr_list_or_flush(argc, argv, 0);
 }

 int do_iplink(int argc, char **argv)
 {
 	if (argc > 0) {
 		if (matches(*argv, "set") == 0)
 			return do_set(argc-1, argv+1);
 		if (matches(*argv, "show") == 0 ||
 		    matches(*argv, "lst") == 0 ||
 		    matches(*argv, "list") == 0)
 			return ipaddr_list_link(argc-1, argv+1);
 	} else
 		return ipaddr_list_link(0, NULL);

 	bb_error_msg("command \"%s\" is unknown", *argv);
 	exit(-1);
 }
	/* vi: set sw=4 ts=4: */
	/*
	* iplink.c "ip link".
	*
	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	*
	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
	*/

	#include "libbb.h"

	#include <sys/ioctl.h>
	#include <sys/socket.h>

	#include <net/if.h>
	#include <net/if_packet.h>
	#include <netpacket/packet.h>

	#include <net/ethernet.h>

	#include "rt_names.h"
	#include "utils.h"
	#include "ip_common.h"

	/* take from linux/sockios.h */
	#define SIOCSIFNAME 0x8923 /* set interface name */

	static int on_off(const char *msg)
	{
	bb_error_msg("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
	return -1;
	}

	static int get_ctl_fd(void)
	{
	int s_errno;
	int fd;

	fd = socket(PF_INET, SOCK_DGRAM, 0);
	if (fd >= 0)
	return fd;
	s_errno = errno;
	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
	if (fd >= 0)
	return fd;
	fd = socket(PF_INET6, SOCK_DGRAM, 0);
	if (fd >= 0)
	return fd;
	errno = s_errno;
	bb_perror_msg("cannot create control socket");
	return -1;
	}

	static int do_chflags(char *dev, uint32_t flags, uint32_t mask)
	{
	struct ifreq ifr;
	int fd;
	int err;

	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
	fd = get_ctl_fd();
	if (fd < 0)
	return -1;
	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
	if (err) {
	bb_perror_msg("SIOCGIFFLAGS");
	close(fd);
	return -1;
	}
	if ((ifr.ifr_flags^flags)&mask) {
	ifr.ifr_flags &= ~mask;
	ifr.ifr_flags \|= mask&flags;
	err = ioctl(fd, SIOCSIFFLAGS, &ifr);
	if (err)
	bb_perror_msg("SIOCSIFFLAGS");
	}
	close(fd);
	return err;
	}

	static int do_changename(char dev, char newdev)
	{
	struct ifreq ifr;
	int fd;
	int err;

	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
	strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
	fd = get_ctl_fd();
	if (fd < 0)
	return -1;
	err = ioctl(fd, SIOCSIFNAME, &ifr);
	if (err) {
	bb_perror_msg("SIOCSIFNAME");
	close(fd);
	return -1;
	}
	close(fd);
	return err;
	}

	static int set_qlen(char *dev, int qlen)
	{
	struct ifreq ifr;
	int s;

	s = get_ctl_fd();
	if (s < 0)
	return -1;

	memset(&ifr, 0, sizeof(ifr));
	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
	ifr.ifr_qlen = qlen;
	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
	bb_perror_msg("SIOCSIFXQLEN");
	close(s);
	return -1;
	}
	close(s);

	return 0;
	}

	static int set_mtu(char *dev, int mtu)
	{
	struct ifreq ifr;
	int s;

	s = get_ctl_fd();
	if (s < 0)
	return -1;

	memset(&ifr, 0, sizeof(ifr));
	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
	ifr.ifr_mtu = mtu;
	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
	bb_perror_msg("SIOCSIFMTU");
	close(s);
	return -1;
	}
	close(s);

	return 0;
	}

	static int get_address(char dev, int htype)
	{
	struct ifreq ifr;
	struct sockaddr_ll me;
	socklen_t alen;
	int s;

	s = socket(PF_PACKET, SOCK_DGRAM, 0);
	if (s < 0) {
	bb_perror_msg("socket(PF_PACKET)");
	return -1;
	}

	memset(&ifr, 0, sizeof(ifr));
	strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
	bb_perror_msg("SIOCGIFINDEX");
	close(s);
	return -1;
	}

	memset(&me, 0, sizeof(me));
	me.sll_family = AF_PACKET;
	me.sll_ifindex = ifr.ifr_ifindex;
	me.sll_protocol = htons(ETH_P_LOOP);
	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
	bb_perror_msg("bind");
	close(s);
	return -1;
	}

	alen = sizeof(me);
	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
	bb_perror_msg("getsockname");
	close(s);
	return -1;
	}
	close(s);
	*htype = me.sll_hatype;
	return me.sll_halen;
	}

	static int parse_address(char dev, int hatype, int halen, char lla, struct ifreq *ifr)
	{
	int alen;

	memset(ifr, 0, sizeof(*ifr));
	strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
	ifr->ifr_hwaddr.sa_family = hatype;
	alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
	if (alen < 0)
	return -1;
	if (alen != halen) {
	bb_error_msg("wrong address (%s) length: expected %d bytes", lla, halen);
	return -1;
	}
	return 0;
	}

	static int set_address(struct ifreq *ifr, int brd)
	{
	int s;

	s = get_ctl_fd();
	if (s < 0)
	return -1;
	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
	bb_perror_msg(brd ? "SIOCSIFHWBROADCAST" : "SIOCSIFHWADDR");
	close(s);
	return -1;
	}
	close(s);
	return 0;
	}


	static int do_set(int argc, char **argv)
	{
	char *dev = NULL;
	uint32_t mask = 0;
	uint32_t flags = 0;
	int qlen = -1;
	int mtu = -1;
	char *newaddr = NULL;
	char *newbrd = NULL;
	struct ifreq ifr0, ifr1;
	char *newname = NULL;
	int htype, halen;

	while (argc > 0) {
	if (strcmp(*argv, "up") == 0) {
	mask \|= IFF_UP;
	flags \|= IFF_UP;
	} else if (strcmp(*argv, "down") == 0) {
	mask \|= IFF_UP;
	flags &= ~IFF_UP;
	} else if (strcmp(*argv, "name") == 0) {
	NEXT_ARG();
	newname = *argv;
	} else if (strcmp(*argv, "mtu") == 0) {
	NEXT_ARG();
	if (mtu != -1)
	duparg("mtu", *argv);
	if (get_integer(&mtu, *argv, 0))
	invarg(*argv, "mtu");
	} else if (strcmp(*argv, "multicast") == 0) {
	NEXT_ARG();
	mask \|= IFF_MULTICAST;
	if (strcmp(*argv, "on") == 0) {
	flags \|= IFF_MULTICAST;
	} else if (strcmp(*argv, "off") == 0) {
	flags &= ~IFF_MULTICAST;
	} else
	return on_off("multicast");
	} else if (strcmp(*argv, "arp") == 0) {
	NEXT_ARG();
	mask \|= IFF_NOARP;
	if (strcmp(*argv, "on") == 0) {
	flags &= ~IFF_NOARP;
	} else if (strcmp(*argv, "off") == 0) {
	flags \|= IFF_NOARP;
	} else
	return on_off("noarp");
	} else if (strcmp(*argv, "addr") == 0) {
	NEXT_ARG();
	newaddr = *argv;
	} else {
	if (strcmp(*argv, "dev") == 0) {
	NEXT_ARG();
	}
	if (dev)
	duparg2("dev", *argv);
	dev = *argv;
	}
	argc--; argv++;
	}

	if (!dev) {
	bb_error_msg(bb_msg_requires_arg, "\"dev\"");
	exit(-1);
	}

	if (newaddr \|\| newbrd) {
	halen = get_address(dev, &htype);
	if (halen < 0)
	return -1;
	if (newaddr) {
	if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
	return -1;
	}
	if (newbrd) {
	if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
	return -1;
	}
	}

	if (newname && strcmp(dev, newname)) {
	if (do_changename(dev, newname) < 0)
	return -1;
	dev = newname;
	}
	if (qlen != -1) {
	if (set_qlen(dev, qlen) < 0)
	return -1;
	}
	if (mtu != -1) {
	if (set_mtu(dev, mtu) < 0)
	return -1;
	}
	if (newaddr \|\| newbrd) {
	if (newbrd) {
	if (set_address(&ifr1, 1) < 0)
	return -1;
	}
	if (newaddr) {
	if (set_address(&ifr0, 0) < 0)
	return -1;
	}
	}
	if (mask)
	return do_chflags(dev, flags, mask);
	return 0;
	}

	static int ipaddr_list_link(int argc, char **argv)
	{
	preferred_family = AF_PACKET;
	return ipaddr_list_or_flush(argc, argv, 0);
	}

	int do_iplink(int argc, char **argv)
	{
	if (argc > 0) {
	if (matches(*argv, "set") == 0)
	return do_set(argc-1, argv+1);
	if (matches(*argv, "show") == 0 \|\|
	matches(*argv, "lst") == 0 \|\|
	matches(*argv, "list") == 0)
	return ipaddr_list_link(argc-1, argv+1);
	} else
	return ipaddr_list_link(0, NULL);

	bb_error_msg("command \"%s\" is unknown", *argv);
	exit(-1);
	}