networking/libiproute/ipaddress.c - nest-hello/busybox - Git at Google

 /* vi: set sw=4 ts=4: */
 /*
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  *
  * 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

 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;
 } FIX_ALIASING;
 typedef struct filter_t filter_t;

 #define G_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('<');
 	if (flags & IFF_UP && !(flags & IFF_RUNNING))
 		printf("NO-CARRIER,");
 	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 (G_filter.ifindex && ifi->ifi_index != G_filter.ifindex)
 		return 0;
 	if (G_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 (G_filter.label
 	 && (!G_filter.family || G_filter.family == AF_PACKET)
 	 && fnmatch(G_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]) {
 			int iflink = *(int*)RTA_DATA(tb[IFLA_LINK]);
 			if (iflink == 0)
 				printf("@NONE: ");
 			else {
 				printf("@%s: ", ll_index_to_name(iflink));
 				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]) {
 		printf("master %s ", ll_index_to_name(*(int*)RTA_DATA(tb[IFLA_MASTER])));
 	}
 #endif
 /* IFLA_OPERSTATE was added to kernel with the same commit as IFF_DORMANT */
 #ifdef IFF_DORMANT
 	if (tb[IFLA_OPERSTATE]) {
 		static const char operstate_labels[] ALIGN1 =
 			"UNKNOWN\0""NOTPRESENT\0""DOWN\0""LOWERLAYERDOWN\0"
 			"TESTING\0""DORMANT\0""UP\0";
 		printf("state %s ", nth_string(operstate_labels,
 					*(uint8_t *)RTA_DATA(tb[IFLA_OPERSTATE])));
 	}
 #endif
 	if (G_filter.showqueue)
 		print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));

 	if (!G_filter.family || G_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(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
 		bb_perror_msg("can't send flush request");
 		return -1;
 	}
 	G_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];

 	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 (G_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 (G_filter.ifindex && G_filter.ifindex != ifa->ifa_index)
 		return 0;
 	if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
 		return 0;
 	if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
 		return 0;
 	if (G_filter.label) {
 		const char *label;
 		if (rta_tb[IFA_LABEL])
 			label = RTA_DATA(rta_tb[IFA_LABEL]);
 		else
 			label = ll_index_to_name(ifa->ifa_index);
 		if (fnmatch(G_filter.label, label, 0) != 0)
 			return 0;
 	}
 	if (G_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, &G_filter.pfx, G_filter.pfx.bitlen))
 				return 0;
 		}
 	}

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

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

 	if (G_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));
 	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
 		 || (G_filter.family && G_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(&G_filter, 0, sizeof(G_filter));
 	G_filter.oneline = _oneline;
 }

 /* Return value becomes exitcode. It's okay to not return at all */
 int FAST_FUNC 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);
 	G_filter.showqueue = 1;

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

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

 	while (*argv) {
 		const smalluint key = index_in_strings(option, *argv);
 		if (key == 0) { /* to */
 			NEXT_ARG();
 			get_prefix(&G_filter.pfx, *argv, G_filter.family);
 			if (G_filter.family == AF_UNSPEC) {
 				G_filter.family = G_filter.pfx.family;
 			}
 		} else if (key == 1) { /* scope */
 			uint32_t scope = 0;
 			NEXT_ARG();
 			G_filter.scopemask = -1;
 			if (rtnl_rtscope_a2n(&scope, *argv)) {
 				if (strcmp(*argv, "all") != 0) {
 					invarg(*argv, "scope");
 				}
 				scope = RT_SCOPE_NOWHERE;
 				G_filter.scopemask = 0;
 			}
 			G_filter.scope = scope;
 		} else if (key == 2) { /* up */
 			G_filter.up = 1;
 		} else if (key == 3) { /* label */
 			NEXT_ARG();
 			G_filter.label = *argv;
 		} else {
 			if (key == 4) /* dev */
 				NEXT_ARG();
 			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) {
 		G_filter.ifindex = xll_name_to_index(filter_dev);
 	}

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

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

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

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


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

 		if (G_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
 				 || (G_filter.family && G_filter.family != ifa->ifa_family)
 				) {
 					continue;
 				}
 				if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
 					continue;
 				if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
 					continue;
 				if (G_filter.pfx.family || G_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 (G_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, &G_filter.pfx, G_filter.pfx.bitlen))
 							continue;
 					}
 					if (G_filter.label) {
 						const char *label;
 						if (tb[IFA_LABEL])
 							label = RTA_DATA(tb[IFA_LABEL]);
 						else
 							label = ll_index_to_name(ifa->ifa_index);
 						if (fnmatch(G_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 (G_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, int flags, 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 | flags;
 	req.n.nlmsg_type = cmd;
 	req.ifa.ifa_family = preferred_family;

 	while (*argv) {
 		unsigned arg = index_in_strings(option, *argv);
 		/* if search fails, "local" is assumed */
 		if ((int)arg >= 0)
 			NEXT_ARG();

 		if (arg <= 1) { /* peer, remote */
 			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;
 		} else if (arg <= 3) { /* broadcast, brd */
 			inet_prefix addr;
 			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;
 			}
 		} else if (arg == 4) { /* anycast */
 			inet_prefix addr;
 			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;
 		} else if (arg == 5) { /* scope */
 			uint32_t scope = 0;
 			if (rtnl_rtscope_a2n(&scope, *argv)) {
 				invarg(*argv, "scope");
 			}
 			req.ifa.ifa_scope = scope;
 			scoped = 1;
 		} else if (arg == 6) { /* dev */
 			d = *argv;
 		} else if (arg == 7) { /* label */
 			l = *argv;
 			addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l) + 1);
 		} else {
 			/* local (specified or assumed) */
 			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) {
 		/* There was no "dev IFACE", but we need that */
 		bb_error_msg_and_die("need \"dev IFACE\"");
 	}
 	if (l && !is_prefixed_with(l, d)) {
 		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 FAST_FUNC do_ipaddr(char **argv)
 {
 	static const char commands[] ALIGN1 =
 		/* 0    1         2      3          4         5       6       7      8 */
 		"add\0""change\0""chg\0""replace\0""delete\0""list\0""show\0""lst\0""flush\0";
 	int cmd = 2;
 	if (*argv) {
 		cmd = index_in_substrings(commands, *argv);
 		if (cmd < 0)
 			invarg(*argv, applet_name);
 		argv++;
 		if (cmd <= 4) {
 			return ipaddr_modify(
 				/*cmd:*/ cmd == 4 ? RTM_DELADDR : RTM_NEWADDR,
 				/*flags:*/
 					cmd == 0 ? NLM_F_CREATE|NLM_F_EXCL : /* add */
 					cmd == 1 || cmd == 2 ? NLM_F_REPLACE : /* change */
 					cmd == 3 ? NLM_F_CREATE|NLM_F_REPLACE : /* replace */
 					0 /* delete */
 			, argv);
 		}
 	}
 	return ipaddr_list_or_flush(argv, cmd == 8);
 }
	/* vi: set sw=4 ts=4: */
	/*
	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
	*
	* 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

	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;
	} FIX_ALIASING;
	typedef struct filter_t filter_t;

	#define G_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('<');
	if (flags & IFF_UP && !(flags & IFF_RUNNING))
	printf("NO-CARRIER,");
	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 (G_filter.ifindex && ifi->ifi_index != G_filter.ifindex)
	return 0;
	if (G_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 (G_filter.label
	&& (!G_filter.family \|\| G_filter.family == AF_PACKET)
	&& fnmatch(G_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]) {
	int iflink = (int)RTA_DATA(tb[IFLA_LINK]);
	if (iflink == 0)
	printf("@NONE: ");
	else {
	printf("@%s: ", ll_index_to_name(iflink));
	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]) {
	printf("master %s ", ll_index_to_name((int)RTA_DATA(tb[IFLA_MASTER])));
	}
	#endif
	/* IFLA_OPERSTATE was added to kernel with the same commit as IFF_DORMANT */
	#ifdef IFF_DORMANT
	if (tb[IFLA_OPERSTATE]) {
	static const char operstate_labels[] ALIGN1 =
	"UNKNOWN\0""NOTPRESENT\0""DOWN\0""LOWERLAYERDOWN\0"
	"TESTING\0""DORMANT\0""UP\0";
	printf("state %s ", nth_string(operstate_labels,
	(uint8_t )RTA_DATA(tb[IFLA_OPERSTATE])));
	}
	#endif
	if (G_filter.showqueue)
	print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));

	if (!G_filter.family \|\| G_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(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
	bb_perror_msg("can't send flush request");
	return -1;
	}
	G_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];

	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 (G_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 (G_filter.ifindex && G_filter.ifindex != ifa->ifa_index)
	return 0;
	if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
	return 0;
	if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
	return 0;
	if (G_filter.label) {
	const char *label;
	if (rta_tb[IFA_LABEL])
	label = RTA_DATA(rta_tb[IFA_LABEL]);
	else
	label = ll_index_to_name(ifa->ifa_index);
	if (fnmatch(G_filter.label, label, 0) != 0)
	return 0;
	}
	if (G_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, &G_filter.pfx, G_filter.pfx.bitlen))
	return 0;
	}
	}

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

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

	if (G_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));
	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
	\|\| (G_filter.family && G_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(&G_filter, 0, sizeof(G_filter));
	G_filter.oneline = _oneline;
	}

	/* Return value becomes exitcode. It's okay to not return at all */
	int FAST_FUNC 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);
	G_filter.showqueue = 1;

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

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

	while (*argv) {
	const smalluint key = index_in_strings(option, *argv);
	if (key == 0) { /* to */
	NEXT_ARG();
	get_prefix(&G_filter.pfx, *argv, G_filter.family);
	if (G_filter.family == AF_UNSPEC) {
	G_filter.family = G_filter.pfx.family;
	}
	} else if (key == 1) { /* scope */
	uint32_t scope = 0;
	NEXT_ARG();
	G_filter.scopemask = -1;
	if (rtnl_rtscope_a2n(&scope, *argv)) {
	if (strcmp(*argv, "all") != 0) {
	invarg(*argv, "scope");
	}
	scope = RT_SCOPE_NOWHERE;
	G_filter.scopemask = 0;
	}
	G_filter.scope = scope;
	} else if (key == 2) { /* up */
	G_filter.up = 1;
	} else if (key == 3) { /* label */
	NEXT_ARG();
	G_filter.label = *argv;
	} else {
	if (key == 4) /* dev */
	NEXT_ARG();
	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) {
	G_filter.ifindex = xll_name_to_index(filter_dev);
	}

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

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

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

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


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

	if (G_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
	\|\| (G_filter.family && G_filter.family != ifa->ifa_family)
	) {
	continue;
	}
	if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
	continue;
	if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
	continue;
	if (G_filter.pfx.family \|\| G_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 (G_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, &G_filter.pfx, G_filter.pfx.bitlen))
	continue;
	}
	if (G_filter.label) {
	const char *label;
	if (tb[IFA_LABEL])
	label = RTA_DATA(tb[IFA_LABEL]);
	else
	label = ll_index_to_name(ifa->ifa_index);
	if (fnmatch(G_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 (G_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, int flags, 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 \| flags;
	req.n.nlmsg_type = cmd;
	req.ifa.ifa_family = preferred_family;

	while (*argv) {
	unsigned arg = index_in_strings(option, *argv);
	/* if search fails, "local" is assumed */
	if ((int)arg >= 0)
	NEXT_ARG();

	if (arg <= 1) { /* peer, remote */
	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;
	} else if (arg <= 3) { /* broadcast, brd */
	inet_prefix addr;
	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;
	}
	} else if (arg == 4) { /* anycast */
	inet_prefix addr;
	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;
	} else if (arg == 5) { /* scope */
	uint32_t scope = 0;
	if (rtnl_rtscope_a2n(&scope, *argv)) {
	invarg(*argv, "scope");
	}
	req.ifa.ifa_scope = scope;
	scoped = 1;
	} else if (arg == 6) { /* dev */
	d = *argv;
	} else if (arg == 7) { /* label */
	l = *argv;
	addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l) + 1);
	} else {
	/* local (specified or assumed) */
	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) {
	/* There was no "dev IFACE", but we need that */
	bb_error_msg_and_die("need \"dev IFACE\"");
	}
	if (l && !is_prefixed_with(l, d)) {
	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 FAST_FUNC do_ipaddr(char **argv)
	{
	static const char commands[] ALIGN1 =
	/* 0 1 2 3 4 5 6 7 8 */
	"add\0""change\0""chg\0""replace\0""delete\0""list\0""show\0""lst\0""flush\0";
	int cmd = 2;
	if (*argv) {
	cmd = index_in_substrings(commands, *argv);
	if (cmd < 0)
	invarg(*argv, applet_name);
	argv++;
	if (cmd <= 4) {
	return ipaddr_modify(
	/cmd:/ cmd == 4 ? RTM_DELADDR : RTM_NEWADDR,
	/flags:/
	cmd == 0 ? NLM_F_CREATE\|NLM_F_EXCL : /* add */
	cmd == 1 \|\| cmd == 2 ? NLM_F_REPLACE : /* change */
	cmd == 3 ? NLM_F_CREATE\|NLM_F_REPLACE : /* replace */
	0 /* delete */
	, argv);
	}
	}
	return ipaddr_list_or_flush(argv, cmd == 8);
	}