networking/libiproute/ipaddress.c

/* vi: set sw=4 ts=4: */
/*
 * ipaddress.c		"ip address".
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Changes:
 *	Laszlo Valko <valko@linux.karinthy.hu> 990223: address label must be zero terminated
 */

#include <fnmatch.h>
#include <net/if.h>
#include <net/if_arp.h>

#include "ip_common.h"  /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"

#ifndef IFF_LOWER_UP
/* from linux/if.h */
#define IFF_LOWER_UP	0x10000		/* driver signals L1 up*/
#endif

typedef struct filter_t {
	char *label;
	char *flushb;
	struct rtnl_handle *rth;
	int scope, scopemask;
	int flags, flagmask;
	int flushp;
	int flushe;
	int ifindex;
	family_t family;
	smallint showqueue;
	smallint oneline;
	smallint up;
	smallint flushed;
	inet_prefix pfx;
} filter_t;

#define filter (*(filter_t*)&bb_common_bufsiz1)


static void print_link_flags(unsigned flags, unsigned mdown)
{
	static const int flag_masks[] = {
		IFF_LOOPBACK, IFF_BROADCAST, IFF_POINTOPOINT,
		IFF_MULTICAST, IFF_NOARP, IFF_UP, IFF_LOWER_UP };
	static const char flag_labels[] ALIGN1 =
		"LOOPBACK\0""BROADCAST\0""POINTOPOINT\0"
		"MULTICAST\0""NOARP\0""UP\0""LOWER_UP\0";

	bb_putchar('<');
	flags &= ~IFF_RUNNING;
#if 0
	_PF(ALLMULTI);
	_PF(PROMISC);
	_PF(MASTER);
	_PF(SLAVE);
	_PF(DEBUG);
	_PF(DYNAMIC);
	_PF(AUTOMEDIA);
	_PF(PORTSEL);
	_PF(NOTRAILERS);
#endif
	flags = print_flags_separated(flag_masks, flag_labels, flags, ",");
	if (flags)
		printf("%x", flags);
	if (mdown)
		printf(",M-DOWN");
	printf("> ");
}

static void print_queuelen(char *name)
{
	struct ifreq ifr;
	int s;

	s = socket(AF_INET, SOCK_STREAM, 0);
	if (s < 0)
		return;

	memset(&ifr, 0, sizeof(ifr));
	strncpy_IFNAMSIZ(ifr.ifr_name, name);
	if (ioctl_or_warn(s, SIOCGIFTXQLEN, &ifr) < 0) {
		close(s);
		return;
	}
	close(s);

	if (ifr.ifr_qlen)
		printf("qlen %d", ifr.ifr_qlen);
}

static NOINLINE int print_linkinfo(const struct nlmsghdr *n)
{
	struct ifinfomsg *ifi = NLMSG_DATA(n);
	struct rtattr *tb[IFLA_MAX+1];
	int len = n->nlmsg_len;

	if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
		return 0;

	len -= NLMSG_LENGTH(sizeof(*ifi));
	if (len < 0)
		return -1;

	if (filter.ifindex && ifi->ifi_index != filter.ifindex)
		return 0;
	if (filter.up && !(ifi->ifi_flags & IFF_UP))
		return 0;

	memset(tb, 0, sizeof(tb));
	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
	if (tb[IFLA_IFNAME] == NULL) {
		bb_error_msg("nil ifname");
		return -1;
	}
	if (filter.label
	 && (!filter.family || filter.family == AF_PACKET)
	 && fnmatch(filter.label, RTA_DATA(tb[IFLA_IFNAME]), 0)
	) {
		return 0;
	}

	if (n->nlmsg_type == RTM_DELLINK)
		printf("Deleted ");

	printf("%d: %s", ifi->ifi_index,
		/*tb[IFLA_IFNAME] ? (char*)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>" - we checked tb[IFLA_IFNAME] above*/
		(char*)RTA_DATA(tb[IFLA_IFNAME])
	);

	{
		unsigned m_flag = 0;
		if (tb[IFLA_LINK]) {
			SPRINT_BUF(b1);
			int iflink = *(int*)RTA_DATA(tb[IFLA_LINK]);
			if (iflink == 0)
				printf("@NONE: ");
			else {
				printf("@%s: ", ll_idx_n2a(iflink, b1));
				m_flag = ll_index_to_flags(iflink);
				m_flag = !(m_flag & IFF_UP);
			}
		} else {
			printf(": ");
		}
		print_link_flags(ifi->ifi_flags, m_flag);
	}

	if (tb[IFLA_MTU])
		printf("mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU]));
	if (tb[IFLA_QDISC])
		printf("qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC]));
#ifdef IFLA_MASTER
	if (tb[IFLA_MASTER]) {
		SPRINT_BUF(b1);
		printf("master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1));
	}
#endif
	if (filter.showqueue)
		print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));

	if (!filter.family || filter.family == AF_PACKET) {
		SPRINT_BUF(b1);
		printf("%c    link/%s ", _SL_, ll_type_n2a(ifi->ifi_type, b1));

		if (tb[IFLA_ADDRESS]) {
			fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_ADDRESS]),
						      RTA_PAYLOAD(tb[IFLA_ADDRESS]),
						      ifi->ifi_type,
						      b1, sizeof(b1)), stdout);
		}
		if (tb[IFLA_BROADCAST]) {
			if (ifi->ifi_flags & IFF_POINTOPOINT)
				printf(" peer ");
			else
				printf(" brd ");
			fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_BROADCAST]),
						      RTA_PAYLOAD(tb[IFLA_BROADCAST]),
						      ifi->ifi_type,
						      b1, sizeof(b1)), stdout);
		}
	}
	bb_putchar('\n');
	/*fflush_all();*/
	return 0;
}

static int flush_update(void)
{
	if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
		bb_perror_msg("failed to send flush request");
		return -1;
	}
	filter.flushp = 0;
	return 0;
}

static int FAST_FUNC print_addrinfo(const struct sockaddr_nl *who UNUSED_PARAM,
		struct nlmsghdr *n, void *arg UNUSED_PARAM)
{
	struct ifaddrmsg *ifa = NLMSG_DATA(n);
	int len = n->nlmsg_len;
	struct rtattr * rta_tb[IFA_MAX+1];
	char abuf[256];
	SPRINT_BUF(b1);

	if (n->nlmsg_type != RTM_NEWADDR && n->nlmsg_type != RTM_DELADDR)
		return 0;
	len -= NLMSG_LENGTH(sizeof(*ifa));
	if (len < 0) {
		bb_error_msg("wrong nlmsg len %d", len);
		return -1;
	}

	if (filter.flushb && n->nlmsg_type != RTM_NEWADDR)
		return 0;

	memset(rta_tb, 0, sizeof(rta_tb));
	parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));

	if (!rta_tb[IFA_LOCAL])
		rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS];
	if (!rta_tb[IFA_ADDRESS])
		rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL];

	if (filter.ifindex && filter.ifindex != ifa->ifa_index)
		return 0;
	if ((filter.scope ^ ifa->ifa_scope) & filter.scopemask)
		return 0;
	if ((filter.flags ^ ifa->ifa_flags) & filter.flagmask)
		return 0;
	if (filter.label) {
		const char *label;
		if (rta_tb[IFA_LABEL])
			label = RTA_DATA(rta_tb[IFA_LABEL]);
		else
			label = ll_idx_n2a(ifa->ifa_index, b1);
		if (fnmatch(filter.label, label, 0) != 0)
			return 0;
	}
	if (filter.pfx.family) {
		if (rta_tb[IFA_LOCAL]) {
			inet_prefix dst;
			memset(&dst, 0, sizeof(dst));
			dst.family = ifa->ifa_family;
			memcpy(&dst.data, RTA_DATA(rta_tb[IFA_LOCAL]), RTA_PAYLOAD(rta_tb[IFA_LOCAL]));
			if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
				return 0;
		}
	}

	if (filter.flushb) {
		struct nlmsghdr *fn;
		if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
			if (flush_update())
				return -1;
		}
		fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
		memcpy(fn, n, n->nlmsg_len);
		fn->nlmsg_type = RTM_DELADDR;
		fn->nlmsg_flags = NLM_F_REQUEST;
		fn->nlmsg_seq = ++filter.rth->seq;
		filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
		filter.flushed = 1;
		return 0;
	}

	if (n->nlmsg_type == RTM_DELADDR)
		printf("Deleted ");

	if (filter.oneline)
		printf("%u: %s", ifa->ifa_index, ll_index_to_name(ifa->ifa_index));
	if (ifa->ifa_family == AF_INET)
		printf("    inet ");
	else if (ifa->ifa_family == AF_INET6)
		printf("    inet6 ");
	else
		printf("    family %d ", ifa->ifa_family);

	if (rta_tb[IFA_LOCAL]) {
		fputs(rt_addr_n2a(ifa->ifa_family,
					      RTA_DATA(rta_tb[IFA_LOCAL]),
					      abuf, sizeof(abuf)), stdout);

		if (rta_tb[IFA_ADDRESS] == NULL
		 || memcmp(RTA_DATA(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_LOCAL]), 4) == 0
		) {
			printf("/%d ", ifa->ifa_prefixlen);
		} else {
			printf(" peer %s/%d ",
				rt_addr_n2a(ifa->ifa_family,
					    RTA_DATA(rta_tb[IFA_ADDRESS]),
					    abuf, sizeof(abuf)),
				ifa->ifa_prefixlen);
		}
	}

	if (rta_tb[IFA_BROADCAST]) {
		printf("brd %s ",
			rt_addr_n2a(ifa->ifa_family,
				    RTA_DATA(rta_tb[IFA_BROADCAST]),
				    abuf, sizeof(abuf)));
	}
	if (rta_tb[IFA_ANYCAST]) {
		printf("any %s ",
			rt_addr_n2a(ifa->ifa_family,
				    RTA_DATA(rta_tb[IFA_ANYCAST]),
				    abuf, sizeof(abuf)));
	}
	printf("scope %s ", rtnl_rtscope_n2a(ifa->ifa_scope, b1));
	if (ifa->ifa_flags & IFA_F_SECONDARY) {
		ifa->ifa_flags &= ~IFA_F_SECONDARY;
		printf("secondary ");
	}
	if (ifa->ifa_flags & IFA_F_TENTATIVE) {
		ifa->ifa_flags &= ~IFA_F_TENTATIVE;
		printf("tentative ");
	}
	if (ifa->ifa_flags & IFA_F_DEPRECATED) {
		ifa->ifa_flags &= ~IFA_F_DEPRECATED;
		printf("deprecated ");
	}
	if (!(ifa->ifa_flags & IFA_F_PERMANENT)) {
		printf("dynamic ");
	} else
		ifa->ifa_flags &= ~IFA_F_PERMANENT;
	if (ifa->ifa_flags)
		printf("flags %02x ", ifa->ifa_flags);
	if (rta_tb[IFA_LABEL])
		fputs((char*)RTA_DATA(rta_tb[IFA_LABEL]), stdout);
	if (rta_tb[IFA_CACHEINFO]) {
		struct ifa_cacheinfo *ci = RTA_DATA(rta_tb[IFA_CACHEINFO]);
		char buf[128];
		bb_putchar(_SL_);
		if (ci->ifa_valid == 0xFFFFFFFFU)
			sprintf(buf, "valid_lft forever");
		else
			sprintf(buf, "valid_lft %dsec", ci->ifa_valid);
		if (ci->ifa_prefered == 0xFFFFFFFFU)
			sprintf(buf+strlen(buf), " preferred_lft forever");
		else
			sprintf(buf+strlen(buf), " preferred_lft %dsec", ci->ifa_prefered);
		printf("       %s", buf);
	}
	bb_putchar('\n');
	/*fflush_all();*/
	return 0;
}


struct nlmsg_list {
	struct nlmsg_list *next;
	struct nlmsghdr	  h;
};

static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo)
{
	for (; ainfo; ainfo = ainfo->next) {
		struct nlmsghdr *n = &ainfo->h;
		struct ifaddrmsg *ifa = NLMSG_DATA(n);

		if (n->nlmsg_type != RTM_NEWADDR)
			continue;

		if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifa)))
			return -1;

		if (ifa->ifa_index != ifindex ||
		    (filter.family && filter.family != ifa->ifa_family))
			continue;

		print_addrinfo(NULL, n, NULL);
	}
	return 0;
}


static int FAST_FUNC store_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
	struct nlmsg_list **linfo = (struct nlmsg_list**)arg;
	struct nlmsg_list *h;
	struct nlmsg_list **lp;

	h = xzalloc(n->nlmsg_len + sizeof(void*));

	memcpy(&h->h, n, n->nlmsg_len);
	/*h->next = NULL; - xzalloc did it */

	for (lp = linfo; *lp; lp = &(*lp)->next)
		continue;
	*lp = h;

	ll_remember_index(who, n, NULL);
	return 0;
}

static void ipaddr_reset_filter(int _oneline)
{
	memset(&filter, 0, sizeof(filter));
	filter.oneline = _oneline;
}

/* Return value becomes exitcode. It's okay to not return at all */
int ipaddr_list_or_flush(char **argv, int flush)
{
	static const char option[] ALIGN1 = "to\0""scope\0""up\0""label\0""dev\0";

	struct nlmsg_list *linfo = NULL;
	struct nlmsg_list *ainfo = NULL;
	struct nlmsg_list *l;
	struct rtnl_handle rth;
	char *filter_dev = NULL;
	int no_link = 0;

	ipaddr_reset_filter(oneline);
	filter.showqueue = 1;

	if (filter.family == AF_UNSPEC)
		filter.family = preferred_family;

	if (flush) {
		if (!*argv) {
			bb_error_msg_and_die(bb_msg_requires_arg, "flush");
		}
		if (filter.family == AF_PACKET) {
			bb_error_msg_and_die("can't flush link addresses");
		}
	}

	while (*argv) {
		const int option_num = index_in_strings(option, *argv);
		switch (option_num) {
			case 0: /* to */
				NEXT_ARG();
				get_prefix(&filter.pfx, *argv, filter.family);
				if (filter.family == AF_UNSPEC) {
					filter.family = filter.pfx.family;
				}
				break;
			case 1: /* scope */
			{
				uint32_t scope = 0;
				NEXT_ARG();
				filter.scopemask = -1;
				if (rtnl_rtscope_a2n(&scope, *argv)) {
					if (strcmp(*argv, "all") != 0) {
						invarg(*argv, "scope");
					}
					scope = RT_SCOPE_NOWHERE;
					filter.scopemask = 0;
				}
				filter.scope = scope;
				break;
			}
			case 2: /* up */
				filter.up = 1;
				break;
			case 3: /* label */
				NEXT_ARG();
				filter.label = *argv;
				break;
			case 4: /* dev */
				NEXT_ARG();
			default:
				if (filter_dev) {
					duparg2("dev", *argv);
				}
				filter_dev = *argv;
		}
		argv++;
	}

	xrtnl_open(&rth);

	xrtnl_wilddump_request(&rth, preferred_family, RTM_GETLINK);
	xrtnl_dump_filter(&rth, store_nlmsg, &linfo);

	if (filter_dev) {
		filter.ifindex = xll_name_to_index(filter_dev);
	}

	if (flush) {
		char flushb[4096-512];

		filter.flushb = flushb;
		filter.flushp = 0;
		filter.flushe = sizeof(flushb);
		filter.rth = &rth;

		for (;;) {
			xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
			filter.flushed = 0;
			xrtnl_dump_filter(&rth, print_addrinfo, NULL);
			if (filter.flushed == 0) {
				return 0;
			}
			if (flush_update() < 0)
				return 1;
		}
	}

	if (filter.family != AF_PACKET) {
		xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
		xrtnl_dump_filter(&rth, store_nlmsg, &ainfo);
	}


	if (filter.family && filter.family != AF_PACKET) {
		struct nlmsg_list **lp;
		lp = &linfo;

		if (filter.oneline)
			no_link = 1;

		while ((l = *lp) != NULL) {
			int ok = 0;
			struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
			struct nlmsg_list *a;

			for (a = ainfo; a; a = a->next) {
				struct nlmsghdr *n = &a->h;
				struct ifaddrmsg *ifa = NLMSG_DATA(n);

				if (ifa->ifa_index != ifi->ifi_index ||
				    (filter.family && filter.family != ifa->ifa_family))
					continue;
				if ((filter.scope ^ ifa->ifa_scope) & filter.scopemask)
					continue;
				if ((filter.flags ^ ifa->ifa_flags) & filter.flagmask)
					continue;
				if (filter.pfx.family || filter.label) {
					struct rtattr *tb[IFA_MAX+1];
					memset(tb, 0, sizeof(tb));
					parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), IFA_PAYLOAD(n));
					if (!tb[IFA_LOCAL])
						tb[IFA_LOCAL] = tb[IFA_ADDRESS];

					if (filter.pfx.family && tb[IFA_LOCAL]) {
						inet_prefix dst;
						memset(&dst, 0, sizeof(dst));
						dst.family = ifa->ifa_family;
						memcpy(&dst.data, RTA_DATA(tb[IFA_LOCAL]), RTA_PAYLOAD(tb[IFA_LOCAL]));
						if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
							continue;
					}
					if (filter.label) {
						SPRINT_BUF(b1);
						const char *label;
						if (tb[IFA_LABEL])
							label = RTA_DATA(tb[IFA_LABEL]);
						else
							label = ll_idx_n2a(ifa->ifa_index, b1);
						if (fnmatch(filter.label, label, 0) != 0)
							continue;
					}
				}

				ok = 1;
				break;
			}
			if (!ok)
				*lp = l->next;
			else
				lp = &l->next;
		}
	}

	for (l = linfo; l; l = l->next) {
		if (no_link || print_linkinfo(&l->h) == 0) {
			struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
			if (filter.family != AF_PACKET)
				print_selected_addrinfo(ifi->ifi_index, ainfo);
		}
	}

	return 0;
}

static int default_scope(inet_prefix *lcl)
{
	if (lcl->family == AF_INET) {
		if (lcl->bytelen >= 1 && *(uint8_t*)&lcl->data == 127)
			return RT_SCOPE_HOST;
	}
	return 0;
}

/* Return value becomes exitcode. It's okay to not return at all */
static int ipaddr_modify(int cmd, char **argv)
{
	static const char option[] ALIGN1 =
		"peer\0""remote\0""broadcast\0""brd\0"
		"anycast\0""scope\0""dev\0""label\0""local\0";
	struct rtnl_handle rth;
	struct {
		struct nlmsghdr  n;
		struct ifaddrmsg ifa;
		char             buf[256];
	} req;
	char *d = NULL;
	char *l = NULL;
	inet_prefix lcl;
	inet_prefix peer;
	int local_len = 0;
	int peer_len = 0;
	int brd_len = 0;
	int any_len = 0;
	bool scoped = 0;

	memset(&req, 0, sizeof(req));

	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
	req.n.nlmsg_flags = NLM_F_REQUEST;
	req.n.nlmsg_type = cmd;
	req.ifa.ifa_family = preferred_family;

	while (*argv) {
		const int option_num = index_in_strings(option, *argv);
		switch (option_num) {
			case 0: /* peer */
			case 1: /* remote */
				NEXT_ARG();

				if (peer_len) {
					duparg("peer", *argv);
				}
				get_prefix(&peer, *argv, req.ifa.ifa_family);
				peer_len = peer.bytelen;
				if (req.ifa.ifa_family == AF_UNSPEC) {
					req.ifa.ifa_family = peer.family;
				}
				addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &peer.data, peer.bytelen);
				req.ifa.ifa_prefixlen = peer.bitlen;
				break;
			case 2: /* broadcast */
			case 3: /* brd */
			{
				inet_prefix addr;
				NEXT_ARG();
				if (brd_len) {
					duparg("broadcast", *argv);
				}
				if (LONE_CHAR(*argv, '+')) {
					brd_len = -1;
				} else if (LONE_DASH(*argv)) {
					brd_len = -2;
				} else {
					get_addr(&addr, *argv, req.ifa.ifa_family);
					if (req.ifa.ifa_family == AF_UNSPEC)
						req.ifa.ifa_family = addr.family;
					addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &addr.data, addr.bytelen);
					brd_len = addr.bytelen;
				}
				break;
			}
			case 4: /* anycast */
			{
				inet_prefix addr;
				NEXT_ARG();
				if (any_len) {
					duparg("anycast", *argv);
				}
				get_addr(&addr, *argv, req.ifa.ifa_family);
				if (req.ifa.ifa_family == AF_UNSPEC) {
					req.ifa.ifa_family = addr.family;
				}
				addattr_l(&req.n, sizeof(req), IFA_ANYCAST, &addr.data, addr.bytelen);
				any_len = addr.bytelen;
				break;
			}
			case 5: /* scope */
			{
				uint32_t scope = 0;
				NEXT_ARG();
				if (rtnl_rtscope_a2n(&scope, *argv)) {
					invarg(*argv, "scope");
				}
				req.ifa.ifa_scope = scope;
				scoped = 1;
				break;
			}
			case 6: /* dev */
				NEXT_ARG();
				d = *argv;
				break;
			case 7: /* label */
				NEXT_ARG();
				l = *argv;
				addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l)+1);
				break;
			case 8:	/* local */
				NEXT_ARG();
			default:
				if (local_len) {
					duparg2("local", *argv);
				}
				get_prefix(&lcl, *argv, req.ifa.ifa_family);
				if (req.ifa.ifa_family == AF_UNSPEC) {
					req.ifa.ifa_family = lcl.family;
				}
				addattr_l(&req.n, sizeof(req), IFA_LOCAL, &lcl.data, lcl.bytelen);
				local_len = lcl.bytelen;
		}
		argv++;
	}

	if (d == NULL) {
		bb_error_msg(bb_msg_requires_arg, "\"dev\"");
		return -1;
	}
	if (l && strncmp(d, l, strlen(d)) != 0) {
		bb_error_msg_and_die("\"dev\" (%s) must match \"label\" (%s)", d, l);
	}

	if (peer_len == 0 && local_len && cmd != RTM_DELADDR) {
		peer = lcl;
		addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &lcl.data, lcl.bytelen);
	}
	if (req.ifa.ifa_prefixlen == 0)
		req.ifa.ifa_prefixlen = lcl.bitlen;

	if (brd_len < 0 && cmd != RTM_DELADDR) {
		inet_prefix brd;
		int i;
		if (req.ifa.ifa_family != AF_INET) {
			bb_error_msg_and_die("broadcast can be set only for IPv4 addresses");
		}
		brd = peer;
		if (brd.bitlen <= 30) {
			for (i=31; i>=brd.bitlen; i--) {
				if (brd_len == -1)
					brd.data[0] |= htonl(1<<(31-i));
				else
					brd.data[0] &= ~htonl(1<<(31-i));
			}
			addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &brd.data, brd.bytelen);
			brd_len = brd.bytelen;
		}
	}
	if (!scoped && cmd != RTM_DELADDR)
		req.ifa.ifa_scope = default_scope(&lcl);

	xrtnl_open(&rth);

	ll_init_map(&rth);

	req.ifa.ifa_index = xll_name_to_index(d);

	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
		return 2;

	return 0;
}

/* Return value becomes exitcode. It's okay to not return at all */
int do_ipaddr(char **argv)
{
	static const char commands[] ALIGN1 =
		"add\0""delete\0""list\0""show\0""lst\0""flush\0";

	int command_num = 2; /* default command is list */

	if (*argv) {
		command_num = index_in_substrings(commands, *argv);
		if (command_num < 0 || command_num > 5)
			bb_error_msg_and_die("unknown command %s", *argv);
		argv++;
	}
	if (command_num == 0) /* add */
		return ipaddr_modify(RTM_NEWADDR, argv);
	if (command_num == 1) /* delete */
		return ipaddr_modify(RTM_DELADDR, argv);
	if (command_num == 5) /* flush */
		return ipaddr_list_or_flush(argv, 1);
	/* 2 == list, 3 == show, 4 == lst */
	return ipaddr_list_or_flush(argv, 0);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* ipaddress.c "ip address".
4	*
5	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
6	*
7	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
8	*
9	* Changes:
10	* Laszlo Valko <valko@linux.karinthy.hu> 990223: address label must be zero terminated
11	*/
12
13	#include <fnmatch.h>
14	#include <net/if.h>
15	#include <net/if_arp.h>
16
17	#include "ip_common.h" /* #include "libbb.h" is inside */
18	#include "rt_names.h"
19	#include "utils.h"
20
21	#ifndef IFF_LOWER_UP
22	/* from linux/if.h */
23	#define IFF_LOWER_UP 0x10000 /* driver signals L1 up*/
24	#endif
25
26	typedef struct filter_t {
27	char *label;
28	char *flushb;
29	struct rtnl_handle *rth;
30	int scope, scopemask;
31	int flags, flagmask;
32	int flushp;
33	int flushe;
34	int ifindex;
35	family_t family;
36	smallint showqueue;
37	smallint oneline;
38	smallint up;
39	smallint flushed;
40	inet_prefix pfx;
41	} filter_t;
42
43	#define filter ((filter_t)&bb_common_bufsiz1)
44
45
46	static void print_link_flags(unsigned flags, unsigned mdown)
47	{
48	static const int flag_masks[] = {
49	IFF_LOOPBACK, IFF_BROADCAST, IFF_POINTOPOINT,
50	IFF_MULTICAST, IFF_NOARP, IFF_UP, IFF_LOWER_UP };
51	static const char flag_labels[] ALIGN1 =
52	"LOOPBACK\0""BROADCAST\0""POINTOPOINT\0"
53	"MULTICAST\0""NOARP\0""UP\0""LOWER_UP\0";
54
55	bb_putchar('<');
56	flags &= ~IFF_RUNNING;
57	#if 0
58	_PF(ALLMULTI);
59	_PF(PROMISC);
60	_PF(MASTER);
61	_PF(SLAVE);
62	_PF(DEBUG);
63	_PF(DYNAMIC);
64	_PF(AUTOMEDIA);
65	_PF(PORTSEL);
66	_PF(NOTRAILERS);
67	#endif
68	flags = print_flags_separated(flag_masks, flag_labels, flags, ",");
69	if (flags)
70	printf("%x", flags);
71	if (mdown)
72	printf(",M-DOWN");
73	printf("> ");
74	}
75
76	static void print_queuelen(char *name)
77	{
78	struct ifreq ifr;
79	int s;
80
81	s = socket(AF_INET, SOCK_STREAM, 0);
82	if (s < 0)
83	return;
84
85	memset(&ifr, 0, sizeof(ifr));
86	strncpy_IFNAMSIZ(ifr.ifr_name, name);
87	if (ioctl_or_warn(s, SIOCGIFTXQLEN, &ifr) < 0) {
88	close(s);
89	return;
90	}
91	close(s);
92
93	if (ifr.ifr_qlen)
94	printf("qlen %d", ifr.ifr_qlen);
95	}
96
97	static NOINLINE int print_linkinfo(const struct nlmsghdr *n)
98	{
99	struct ifinfomsg *ifi = NLMSG_DATA(n);
100	struct rtattr *tb[IFLA_MAX+1];
101	int len = n->nlmsg_len;
102
103	if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
104	return 0;
105
106	len -= NLMSG_LENGTH(sizeof(*ifi));
107	if (len < 0)
108	return -1;
109
110	if (filter.ifindex && ifi->ifi_index != filter.ifindex)
111	return 0;
112	if (filter.up && !(ifi->ifi_flags & IFF_UP))
113	return 0;
114
115	memset(tb, 0, sizeof(tb));
116	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
117	if (tb[IFLA_IFNAME] == NULL) {
118	bb_error_msg("nil ifname");
119	return -1;
120	}
121	if (filter.label
122	&& (!filter.family \|\| filter.family == AF_PACKET)
123	&& fnmatch(filter.label, RTA_DATA(tb[IFLA_IFNAME]), 0)
124	) {
125	return 0;
126	}
127
128	if (n->nlmsg_type == RTM_DELLINK)
129	printf("Deleted ");
130
131	printf("%d: %s", ifi->ifi_index,
132	/tb[IFLA_IFNAME] ? (char)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>" - we checked tb[IFLA_IFNAME] above*/
133	(char*)RTA_DATA(tb[IFLA_IFNAME])
134	);
135
136	{
137	unsigned m_flag = 0;
138	if (tb[IFLA_LINK]) {
139	SPRINT_BUF(b1);
140	int iflink = (int)RTA_DATA(tb[IFLA_LINK]);
141	if (iflink == 0)
142	printf("@NONE: ");
143	else {
144	printf("@%s: ", ll_idx_n2a(iflink, b1));
145	m_flag = ll_index_to_flags(iflink);
146	m_flag = !(m_flag & IFF_UP);
147	}
148	} else {
149	printf(": ");
150	}
151	print_link_flags(ifi->ifi_flags, m_flag);
152	}
153
154	if (tb[IFLA_MTU])
155	printf("mtu %u ", (int)RTA_DATA(tb[IFLA_MTU]));
156	if (tb[IFLA_QDISC])
157	printf("qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC]));
158	#ifdef IFLA_MASTER
159	if (tb[IFLA_MASTER]) {
160	SPRINT_BUF(b1);
161	printf("master %s ", ll_idx_n2a((int)RTA_DATA(tb[IFLA_MASTER]), b1));
162	}
163	#endif
164	if (filter.showqueue)
165	print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));
166
167	if (!filter.family \|\| filter.family == AF_PACKET) {
168	SPRINT_BUF(b1);
169	printf("%c link/%s ", _SL_, ll_type_n2a(ifi->ifi_type, b1));
170
171	if (tb[IFLA_ADDRESS]) {
172	fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_ADDRESS]),
173	RTA_PAYLOAD(tb[IFLA_ADDRESS]),
174	ifi->ifi_type,
175	b1, sizeof(b1)), stdout);
176	}
177	if (tb[IFLA_BROADCAST]) {
178	if (ifi->ifi_flags & IFF_POINTOPOINT)
179	printf(" peer ");
180	else
181	printf(" brd ");
182	fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_BROADCAST]),
183	RTA_PAYLOAD(tb[IFLA_BROADCAST]),
184	ifi->ifi_type,
185	b1, sizeof(b1)), stdout);
186	}
187	}
188	bb_putchar('\n');
189	/fflush_all();/
190	return 0;
191	}
192
193	static int flush_update(void)
194	{
195	if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
196	bb_perror_msg("failed to send flush request");
197	return -1;
198	}
199	filter.flushp = 0;
200	return 0;
201	}
202
203	static int FAST_FUNC print_addrinfo(const struct sockaddr_nl *who UNUSED_PARAM,
204	struct nlmsghdr n, void arg UNUSED_PARAM)
205	{
206	struct ifaddrmsg *ifa = NLMSG_DATA(n);
207	int len = n->nlmsg_len;
208	struct rtattr * rta_tb[IFA_MAX+1];
209	char abuf[256];
210	SPRINT_BUF(b1);
211
212	if (n->nlmsg_type != RTM_NEWADDR && n->nlmsg_type != RTM_DELADDR)
213	return 0;
214	len -= NLMSG_LENGTH(sizeof(*ifa));
215	if (len < 0) {
216	bb_error_msg("wrong nlmsg len %d", len);
217	return -1;
218	}
219
220	if (filter.flushb && n->nlmsg_type != RTM_NEWADDR)
221	return 0;
222
223	memset(rta_tb, 0, sizeof(rta_tb));
224	parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));
225
226	if (!rta_tb[IFA_LOCAL])
227	rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS];
228	if (!rta_tb[IFA_ADDRESS])
229	rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL];
230
231	if (filter.ifindex && filter.ifindex != ifa->ifa_index)
232	return 0;
233	if ((filter.scope ^ ifa->ifa_scope) & filter.scopemask)
234	return 0;
235	if ((filter.flags ^ ifa->ifa_flags) & filter.flagmask)
236	return 0;
237	if (filter.label) {
238	const char *label;
239	if (rta_tb[IFA_LABEL])
240	label = RTA_DATA(rta_tb[IFA_LABEL]);
241	else
242	label = ll_idx_n2a(ifa->ifa_index, b1);
243	if (fnmatch(filter.label, label, 0) != 0)
244	return 0;
245	}
246	if (filter.pfx.family) {
247	if (rta_tb[IFA_LOCAL]) {
248	inet_prefix dst;
249	memset(&dst, 0, sizeof(dst));
250	dst.family = ifa->ifa_family;
251	memcpy(&dst.data, RTA_DATA(rta_tb[IFA_LOCAL]), RTA_PAYLOAD(rta_tb[IFA_LOCAL]));
252	if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
253	return 0;
254	}
255	}
256
257	if (filter.flushb) {
258	struct nlmsghdr *fn;
259	if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
260	if (flush_update())
261	return -1;
262	}
263	fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
264	memcpy(fn, n, n->nlmsg_len);
265	fn->nlmsg_type = RTM_DELADDR;
266	fn->nlmsg_flags = NLM_F_REQUEST;
267	fn->nlmsg_seq = ++filter.rth->seq;
268	filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
269	filter.flushed = 1;
270	return 0;
271	}
272
273	if (n->nlmsg_type == RTM_DELADDR)
274	printf("Deleted ");
275
276	if (filter.oneline)
277	printf("%u: %s", ifa->ifa_index, ll_index_to_name(ifa->ifa_index));
278	if (ifa->ifa_family == AF_INET)
279	printf(" inet ");
280	else if (ifa->ifa_family == AF_INET6)
281	printf(" inet6 ");
282	else
283	printf(" family %d ", ifa->ifa_family);
284
285	if (rta_tb[IFA_LOCAL]) {
286	fputs(rt_addr_n2a(ifa->ifa_family,
287	RTA_DATA(rta_tb[IFA_LOCAL]),
288	abuf, sizeof(abuf)), stdout);
289
290	if (rta_tb[IFA_ADDRESS] == NULL
291	\|\| memcmp(RTA_DATA(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_LOCAL]), 4) == 0
292	) {
293	printf("/%d ", ifa->ifa_prefixlen);
294	} else {
295	printf(" peer %s/%d ",
296	rt_addr_n2a(ifa->ifa_family,
297	RTA_DATA(rta_tb[IFA_ADDRESS]),
298	abuf, sizeof(abuf)),
299	ifa->ifa_prefixlen);
300	}
301	}
302
303	if (rta_tb[IFA_BROADCAST]) {
304	printf("brd %s ",
305	rt_addr_n2a(ifa->ifa_family,
306	RTA_DATA(rta_tb[IFA_BROADCAST]),
307	abuf, sizeof(abuf)));
308	}
309	if (rta_tb[IFA_ANYCAST]) {
310	printf("any %s ",
311	rt_addr_n2a(ifa->ifa_family,
312	RTA_DATA(rta_tb[IFA_ANYCAST]),
313	abuf, sizeof(abuf)));
314	}
315	printf("scope %s ", rtnl_rtscope_n2a(ifa->ifa_scope, b1));
316	if (ifa->ifa_flags & IFA_F_SECONDARY) {
317	ifa->ifa_flags &= ~IFA_F_SECONDARY;
318	printf("secondary ");
319	}
320	if (ifa->ifa_flags & IFA_F_TENTATIVE) {
321	ifa->ifa_flags &= ~IFA_F_TENTATIVE;
322	printf("tentative ");
323	}
324	if (ifa->ifa_flags & IFA_F_DEPRECATED) {
325	ifa->ifa_flags &= ~IFA_F_DEPRECATED;
326	printf("deprecated ");
327	}
328	if (!(ifa->ifa_flags & IFA_F_PERMANENT)) {
329	printf("dynamic ");
330	} else
331	ifa->ifa_flags &= ~IFA_F_PERMANENT;
332	if (ifa->ifa_flags)
333	printf("flags %02x ", ifa->ifa_flags);
334	if (rta_tb[IFA_LABEL])
335	fputs((char*)RTA_DATA(rta_tb[IFA_LABEL]), stdout);
336	if (rta_tb[IFA_CACHEINFO]) {
337	struct ifa_cacheinfo *ci = RTA_DATA(rta_tb[IFA_CACHEINFO]);
338	char buf[128];
339	bb_putchar(_SL_);
340	if (ci->ifa_valid == 0xFFFFFFFFU)
341	sprintf(buf, "valid_lft forever");
342	else
343	sprintf(buf, "valid_lft %dsec", ci->ifa_valid);
344	if (ci->ifa_prefered == 0xFFFFFFFFU)
345	sprintf(buf+strlen(buf), " preferred_lft forever");
346	else
347	sprintf(buf+strlen(buf), " preferred_lft %dsec", ci->ifa_prefered);
348	printf(" %s", buf);
349	}
350	bb_putchar('\n');
351	/fflush_all();/
352	return 0;
353	}
354
355
356	struct nlmsg_list {
357	struct nlmsg_list *next;
358	struct nlmsghdr h;
359	};
360
361	static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo)
362	{
363	for (; ainfo; ainfo = ainfo->next) {
364	struct nlmsghdr *n = &ainfo->h;
365	struct ifaddrmsg *ifa = NLMSG_DATA(n);
366
367	if (n->nlmsg_type != RTM_NEWADDR)
368	continue;
369
370	if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifa)))
371	return -1;
372
373	if (ifa->ifa_index != ifindex \|\|
374	(filter.family && filter.family != ifa->ifa_family))
375	continue;
376
377	print_addrinfo(NULL, n, NULL);
378	}
379	return 0;
380	}
381
382
383	static int FAST_FUNC store_nlmsg(const struct sockaddr_nl who, struct nlmsghdr n, void *arg)
384	{
385	struct nlmsg_list linfo = (struct nlmsg_list)arg;
386	struct nlmsg_list *h;
387	struct nlmsg_list **lp;
388
389	h = xzalloc(n->nlmsg_len + sizeof(void*));
390
391	memcpy(&h->h, n, n->nlmsg_len);
392	/h->next = NULL; - xzalloc did it /
393
394	for (lp = linfo; lp; lp = &(lp)->next)
395	continue;
396	*lp = h;
397
398	ll_remember_index(who, n, NULL);
399	return 0;
400	}
401
402	static void ipaddr_reset_filter(int _oneline)
403	{
404	memset(&filter, 0, sizeof(filter));
405	filter.oneline = _oneline;
406	}
407
408	/* Return value becomes exitcode. It's okay to not return at all */
409	int ipaddr_list_or_flush(char **argv, int flush)
410	{
411	static const char option[] ALIGN1 = "to\0""scope\0""up\0""label\0""dev\0";
412
413	struct nlmsg_list *linfo = NULL;
414	struct nlmsg_list *ainfo = NULL;
415	struct nlmsg_list *l;
416	struct rtnl_handle rth;
417	char *filter_dev = NULL;
418	int no_link = 0;
419
420	ipaddr_reset_filter(oneline);
421	filter.showqueue = 1;
422
423	if (filter.family == AF_UNSPEC)
424	filter.family = preferred_family;
425
426	if (flush) {
427	if (!*argv) {
428	bb_error_msg_and_die(bb_msg_requires_arg, "flush");
429	}
430	if (filter.family == AF_PACKET) {
431	bb_error_msg_and_die("can't flush link addresses");
432	}
433	}
434
435	while (*argv) {
436	const int option_num = index_in_strings(option, *argv);
437	switch (option_num) {
438	case 0: /* to */
439	NEXT_ARG();
440	get_prefix(&filter.pfx, *argv, filter.family);
441	if (filter.family == AF_UNSPEC) {
442	filter.family = filter.pfx.family;
443	}
444	break;
445	case 1: /* scope */
446	{
447	uint32_t scope = 0;
448	NEXT_ARG();
449	filter.scopemask = -1;
450	if (rtnl_rtscope_a2n(&scope, *argv)) {
451	if (strcmp(*argv, "all") != 0) {
452	invarg(*argv, "scope");
453	}
454	scope = RT_SCOPE_NOWHERE;
455	filter.scopemask = 0;
456	}
457	filter.scope = scope;
458	break;
459	}
460	case 2: /* up */
461	filter.up = 1;
462	break;
463	case 3: /* label */
464	NEXT_ARG();
465	filter.label = *argv;
466	break;
467	case 4: /* dev */
468	NEXT_ARG();
469	default:
470	if (filter_dev) {
471	duparg2("dev", *argv);
472	}
473	filter_dev = *argv;
474	}
475	argv++;
476	}
477
478	xrtnl_open(&rth);
479
480	xrtnl_wilddump_request(&rth, preferred_family, RTM_GETLINK);
481	xrtnl_dump_filter(&rth, store_nlmsg, &linfo);
482
483	if (filter_dev) {
484	filter.ifindex = xll_name_to_index(filter_dev);
485	}
486
487	if (flush) {
488	char flushb[4096-512];
489
490	filter.flushb = flushb;
491	filter.flushp = 0;
492	filter.flushe = sizeof(flushb);
493	filter.rth = &rth;
494
495	for (;;) {
496	xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
497	filter.flushed = 0;
498	xrtnl_dump_filter(&rth, print_addrinfo, NULL);
499	if (filter.flushed == 0) {
500	return 0;
501	}
502	if (flush_update() < 0)
503	return 1;
504	}
505	}
506
507	if (filter.family != AF_PACKET) {
508	xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
509	xrtnl_dump_filter(&rth, store_nlmsg, &ainfo);
510	}
511
512
513	if (filter.family && filter.family != AF_PACKET) {
514	struct nlmsg_list **lp;
515	lp = &linfo;
516
517	if (filter.oneline)
518	no_link = 1;
519
520	while ((l = *lp) != NULL) {
521	int ok = 0;
522	struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
523	struct nlmsg_list *a;
524
525	for (a = ainfo; a; a = a->next) {
526	struct nlmsghdr *n = &a->h;
527	struct ifaddrmsg *ifa = NLMSG_DATA(n);
528
529	if (ifa->ifa_index != ifi->ifi_index \|\|
530	(filter.family && filter.family != ifa->ifa_family))
531	continue;
532	if ((filter.scope ^ ifa->ifa_scope) & filter.scopemask)
533	continue;
534	if ((filter.flags ^ ifa->ifa_flags) & filter.flagmask)
535	continue;
536	if (filter.pfx.family \|\| filter.label) {
537	struct rtattr *tb[IFA_MAX+1];
538	memset(tb, 0, sizeof(tb));
539	parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), IFA_PAYLOAD(n));
540	if (!tb[IFA_LOCAL])
541	tb[IFA_LOCAL] = tb[IFA_ADDRESS];
542
543	if (filter.pfx.family && tb[IFA_LOCAL]) {
544	inet_prefix dst;
545	memset(&dst, 0, sizeof(dst));
546	dst.family = ifa->ifa_family;
547	memcpy(&dst.data, RTA_DATA(tb[IFA_LOCAL]), RTA_PAYLOAD(tb[IFA_LOCAL]));
548	if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
549	continue;
550	}
551	if (filter.label) {
552	SPRINT_BUF(b1);
553	const char *label;
554	if (tb[IFA_LABEL])
555	label = RTA_DATA(tb[IFA_LABEL]);
556	else
557	label = ll_idx_n2a(ifa->ifa_index, b1);
558	if (fnmatch(filter.label, label, 0) != 0)
559	continue;
560	}
561	}
562
563	ok = 1;
564	break;
565	}
566	if (!ok)
567	*lp = l->next;
568	else
569	lp = &l->next;
570	}
571	}
572
573	for (l = linfo; l; l = l->next) {
574	if (no_link \|\| print_linkinfo(&l->h) == 0) {
575	struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
576	if (filter.family != AF_PACKET)
577	print_selected_addrinfo(ifi->ifi_index, ainfo);
578	}
579	}
580
581	return 0;
582	}
583
584	static int default_scope(inet_prefix *lcl)
585	{
586	if (lcl->family == AF_INET) {
587	if (lcl->bytelen >= 1 && (uint8_t)&lcl->data == 127)
588	return RT_SCOPE_HOST;
589	}
590	return 0;
591	}
592
593	/* Return value becomes exitcode. It's okay to not return at all */
594	static int ipaddr_modify(int cmd, char **argv)
595	{
596	static const char option[] ALIGN1 =
597	"peer\0""remote\0""broadcast\0""brd\0"
598	"anycast\0""scope\0""dev\0""label\0""local\0";
599	struct rtnl_handle rth;
600	struct {
601	struct nlmsghdr n;
602	struct ifaddrmsg ifa;
603	char buf[256];
604	} req;
605	char *d = NULL;
606	char *l = NULL;
607	inet_prefix lcl;
608	inet_prefix peer;
609	int local_len = 0;
610	int peer_len = 0;
611	int brd_len = 0;
612	int any_len = 0;
613	bool scoped = 0;
614
615	memset(&req, 0, sizeof(req));
616
617	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
618	req.n.nlmsg_flags = NLM_F_REQUEST;
619	req.n.nlmsg_type = cmd;
620	req.ifa.ifa_family = preferred_family;
621
622	while (*argv) {
623	const int option_num = index_in_strings(option, *argv);
624	switch (option_num) {
625	case 0: /* peer */
626	case 1: /* remote */
627	NEXT_ARG();
628
629	if (peer_len) {
630	duparg("peer", *argv);
631	}
632	get_prefix(&peer, *argv, req.ifa.ifa_family);
633	peer_len = peer.bytelen;
634	if (req.ifa.ifa_family == AF_UNSPEC) {
635	req.ifa.ifa_family = peer.family;
636	}
637	addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &peer.data, peer.bytelen);
638	req.ifa.ifa_prefixlen = peer.bitlen;
639	break;
640	case 2: /* broadcast */
641	case 3: /* brd */
642	{
643	inet_prefix addr;
644	NEXT_ARG();
645	if (brd_len) {
646	duparg("broadcast", *argv);
647	}
648	if (LONE_CHAR(*argv, '+')) {
649	brd_len = -1;
650	} else if (LONE_DASH(*argv)) {
651	brd_len = -2;
652	} else {
653	get_addr(&addr, *argv, req.ifa.ifa_family);
654	if (req.ifa.ifa_family == AF_UNSPEC)
655	req.ifa.ifa_family = addr.family;
656	addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &addr.data, addr.bytelen);
657	brd_len = addr.bytelen;
658	}
659	break;
660	}
661	case 4: /* anycast */
662	{
663	inet_prefix addr;
664	NEXT_ARG();
665	if (any_len) {
666	duparg("anycast", *argv);
667	}
668	get_addr(&addr, *argv, req.ifa.ifa_family);
669	if (req.ifa.ifa_family == AF_UNSPEC) {
670	req.ifa.ifa_family = addr.family;
671	}
672	addattr_l(&req.n, sizeof(req), IFA_ANYCAST, &addr.data, addr.bytelen);
673	any_len = addr.bytelen;
674	break;
675	}
676	case 5: /* scope */
677	{
678	uint32_t scope = 0;
679	NEXT_ARG();
680	if (rtnl_rtscope_a2n(&scope, *argv)) {
681	invarg(*argv, "scope");
682	}
683	req.ifa.ifa_scope = scope;
684	scoped = 1;
685	break;
686	}
687	case 6: /* dev */
688	NEXT_ARG();
689	d = *argv;
690	break;
691	case 7: /* label */
692	NEXT_ARG();
693	l = *argv;
694	addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l)+1);
695	break;
696	case 8: /* local */
697	NEXT_ARG();
698	default:
699	if (local_len) {
700	duparg2("local", *argv);
701	}
702	get_prefix(&lcl, *argv, req.ifa.ifa_family);
703	if (req.ifa.ifa_family == AF_UNSPEC) {
704	req.ifa.ifa_family = lcl.family;
705	}
706	addattr_l(&req.n, sizeof(req), IFA_LOCAL, &lcl.data, lcl.bytelen);
707	local_len = lcl.bytelen;
708	}
709	argv++;
710	}
711
712	if (d == NULL) {
713	bb_error_msg(bb_msg_requires_arg, "\"dev\"");
714	return -1;
715	}
716	if (l && strncmp(d, l, strlen(d)) != 0) {
717	bb_error_msg_and_die("\"dev\" (%s) must match \"label\" (%s)", d, l);
718	}
719
720	if (peer_len == 0 && local_len && cmd != RTM_DELADDR) {
721	peer = lcl;
722	addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &lcl.data, lcl.bytelen);
723	}
724	if (req.ifa.ifa_prefixlen == 0)
725	req.ifa.ifa_prefixlen = lcl.bitlen;
726
727	if (brd_len < 0 && cmd != RTM_DELADDR) {
728	inet_prefix brd;
729	int i;
730	if (req.ifa.ifa_family != AF_INET) {
731	bb_error_msg_and_die("broadcast can be set only for IPv4 addresses");
732	}
733	brd = peer;
734	if (brd.bitlen <= 30) {
735	for (i=31; i>=brd.bitlen; i--) {
736	if (brd_len == -1)
737	brd.data[0] \|= htonl(1<<(31-i));
738	else
739	brd.data[0] &= ~htonl(1<<(31-i));
740	}
741	addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &brd.data, brd.bytelen);
742	brd_len = brd.bytelen;
743	}
744	}
745	if (!scoped && cmd != RTM_DELADDR)
746	req.ifa.ifa_scope = default_scope(&lcl);
747
748	xrtnl_open(&rth);
749
750	ll_init_map(&rth);
751
752	req.ifa.ifa_index = xll_name_to_index(d);
753
754	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
755	return 2;
756
757	return 0;
758	}
759
760	/* Return value becomes exitcode. It's okay to not return at all */
761	int do_ipaddr(char **argv)
762	{
763	static const char commands[] ALIGN1 =
764	"add\0""delete\0""list\0""show\0""lst\0""flush\0";
765
766	int command_num = 2; /* default command is list */
767
768	if (*argv) {
769	command_num = index_in_substrings(commands, *argv);
770	if (command_num < 0 \|\| command_num > 5)
771	bb_error_msg_and_die("unknown command %s", *argv);
772	argv++;
773	}
774	if (command_num == 0) /* add */
775	return ipaddr_modify(RTM_NEWADDR, argv);
776	if (command_num == 1) /* delete */
777	return ipaddr_modify(RTM_DELADDR, argv);
778	if (command_num == 5) /* flush */
779	return ipaddr_list_or_flush(argv, 1);
780	/* 2 == list, 3 == show, 4 == lst */
781	return ipaddr_list_or_flush(argv, 0);
782	}