Blame ip/ip.c

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/*
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 * ip.c		"ip" utility frontend.
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 *
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 *		This program is free software; you can redistribute it and/or
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 *		modify it under the terms of the GNU General Public License
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 *		as published by the Free Software Foundation; either version
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 *		2 of the License, or (at your option) any later version.
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 *
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 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <errno.h>
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#include "version.h"
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#include "utils.h"
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#include "ip_common.h"
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#include "namespace.h"
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#include "color.h"
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#include "rt_names.h"
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int preferred_family = AF_UNSPEC;
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int human_readable;
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int use_iec;
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int show_stats;
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int show_details;
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int oneline;
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int brief;
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int json;
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int timestamp;
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int force;
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int max_flush_loops = 10;
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int batch_mode;
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bool do_all;
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struct rtnl_handle rth = { .fd = -1 };
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static void usage(void) __attribute__((noreturn));
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static void usage(void)
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{
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	fprintf(stderr,
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		"Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
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		"       ip [ -force ] -batch filename\n"
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		"where  OBJECT := { link | address | addrlabel | route | rule | neigh | ntable |\n"
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		"                   tunnel | tuntap | maddress | mroute | mrule | monitor | xfrm |\n"
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		"                   netns | l2tp | fou | macsec | tcp_metrics | token | netconf | ila |\n"
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		"                   vrf | sr | nexthop | mptcp }\n"
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		"       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
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		"                    -h[uman-readable] | -iec | -j[son] | -p[retty] |\n"
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		"                    -f[amily] { inet | inet6 | mpls | bridge | link } |\n"
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		"                    -4 | -6 | -I | -D | -M | -B | -0 |\n"
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		"                    -l[oops] { maximum-addr-flush-attempts } | -br[ief] |\n"
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		"                    -o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |\n"
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		"                    -rc[vbuf] [size] | -n[etns] name | -N[umeric] | -a[ll] |\n"
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		"                    -c[olor]}\n");
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	exit(-1);
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}
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static int do_help(int argc, char **argv)
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{
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	usage();
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	return 0;
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}
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static const struct cmd {
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	const char *cmd;
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	int (*func)(int argc, char **argv);
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} cmds[] = {
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	{ "address",	do_ipaddr },
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	{ "addrlabel",	do_ipaddrlabel },
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	{ "maddress",	do_multiaddr },
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	{ "route",	do_iproute },
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	{ "rule",	do_iprule },
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	{ "neighbor",	do_ipneigh },
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	{ "neighbour",	do_ipneigh },
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	{ "ntable",	do_ipntable },
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	{ "ntbl",	do_ipntable },
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	{ "link",	do_iplink },
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	{ "l2tp",	do_ipl2tp },
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	{ "fou",	do_ipfou },
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	{ "ila",	do_ipila },
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	{ "macsec",	do_ipmacsec },
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	{ "tunnel",	do_iptunnel },
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	{ "tunl",	do_iptunnel },
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	{ "tuntap",	do_iptuntap },
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	{ "tap",	do_iptuntap },
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	{ "token",	do_iptoken },
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	{ "tcpmetrics",	do_tcp_metrics },
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	{ "tcp_metrics", do_tcp_metrics },
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	{ "monitor",	do_ipmonitor },
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	{ "xfrm",	do_xfrm },
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	{ "mroute",	do_multiroute },
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	{ "mrule",	do_multirule },
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	{ "netns",	do_netns },
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	{ "netconf",	do_ipnetconf },
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	{ "vrf",	do_ipvrf},
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	{ "sr",		do_seg6 },
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	{ "nexthop",	do_ipnh },
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	{ "mptcp",	do_mptcp },
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	{ "help",	do_help },
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	{ 0 }
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};
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static int do_cmd(const char *argv0, int argc, char **argv)
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{
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	const struct cmd *c;
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	for (c = cmds; c->cmd; ++c) {
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		if (matches(argv0, c->cmd) == 0)
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			return -(c->func(argc-1, argv+1));
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	}
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	fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
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	return EXIT_FAILURE;
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}
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static int batch(const char *name)
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{
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	char *line = NULL;
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	size_t len = 0;
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	int ret = EXIT_SUCCESS;
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	int orig_family = preferred_family;
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	batch_mode = 1;
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	if (name && strcmp(name, "-") != 0) {
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		if (freopen(name, "r", stdin) == NULL) {
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			fprintf(stderr,
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				"Cannot open file \"%s\" for reading: %s\n",
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				name, strerror(errno));
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			return EXIT_FAILURE;
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		}
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	}
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	if (rtnl_open(&rth, 0) < 0) {
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		fprintf(stderr, "Cannot open rtnetlink\n");
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		return EXIT_FAILURE;
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	}
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	cmdlineno = 0;
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	while (getcmdline(&line, &len, stdin) != -1) {
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		char *largv[100];
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		int largc;
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		preferred_family = orig_family;
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		largc = makeargs(line, largv, 100);
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		if (largc == 0)
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			continue;	/* blank line */
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		if (do_cmd(largv[0], largc, largv)) {
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			fprintf(stderr, "Command failed %s:%d\n",
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				name, cmdlineno);
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			ret = EXIT_FAILURE;
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			if (!force)
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				break;
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		}
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	}
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	if (line)
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		free(line);
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	rtnl_close(&rth);
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	return ret;
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}
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int main(int argc, char **argv)
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{
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	char *basename;
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	char *batch_file = NULL;
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	int color = 0;
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	/* to run vrf exec without root, capabilities might be set, drop them
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	 * if not needed as the first thing.
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	 * execv will drop them for the child command.
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	 * vrf exec requires:
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	 * - cap_dac_override to create the cgroup subdir in /sys
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	 * - cap_sys_admin to load the BPF program
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	 * - cap_net_admin to set the socket into the cgroup
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	 */
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	if (argc < 3 || strcmp(argv[1], "vrf") != 0 ||
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			strcmp(argv[2], "exec") != 0)
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		drop_cap();
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	basename = strrchr(argv[0], '/');
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	if (basename == NULL)
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		basename = argv[0];
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	else
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		basename++;
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	while (argc > 1) {
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		char *opt = argv[1];
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		if (strcmp(opt, "--") == 0) {
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			argc--; argv++;
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			break;
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		}
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		if (opt[0] != '-')
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			break;
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		if (opt[1] == '-')
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			opt++;
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		if (matches(opt, "-loops") == 0) {
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			argc--;
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			argv++;
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			if (argc <= 1)
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				usage();
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			max_flush_loops = atoi(argv[1]);
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		} else if (matches(opt, "-family") == 0) {
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			argc--;
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			argv++;
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			if (argc <= 1)
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				usage();
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			if (strcmp(argv[1], "help") == 0)
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				usage();
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			else
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				preferred_family = read_family(argv[1]);
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			if (preferred_family == AF_UNSPEC)
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				invarg("invalid protocol family", argv[1]);
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		} else if (strcmp(opt, "-4") == 0) {
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			preferred_family = AF_INET;
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		} else if (strcmp(opt, "-6") == 0) {
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			preferred_family = AF_INET6;
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		} else if (strcmp(opt, "-0") == 0) {
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			preferred_family = AF_PACKET;
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		} else if (strcmp(opt, "-D") == 0) {
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			preferred_family = AF_DECnet;
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		} else if (strcmp(opt, "-M") == 0) {
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			preferred_family = AF_MPLS;
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		} else if (strcmp(opt, "-B") == 0) {
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			preferred_family = AF_BRIDGE;
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		} else if (matches(opt, "-human") == 0 ||
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			   matches(opt, "-human-readable") == 0) {
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			++human_readable;
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		} else if (matches(opt, "-iec") == 0) {
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			++use_iec;
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		} else if (matches(opt, "-stats") == 0 ||
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			   matches(opt, "-statistics") == 0) {
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			++show_stats;
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		} else if (matches(opt, "-details") == 0) {
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			++show_details;
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		} else if (matches(opt, "-resolve") == 0) {
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			++resolve_hosts;
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		} else if (matches(opt, "-oneline") == 0) {
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			++oneline;
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		} else if (matches(opt, "-timestamp") == 0) {
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			++timestamp;
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		} else if (matches(opt, "-tshort") == 0) {
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			++timestamp;
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			++timestamp_short;
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		} else if (matches(opt, "-Version") == 0) {
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			printf("ip utility, iproute2-%s\n", version);
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			exit(0);
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		} else if (matches(opt, "-force") == 0) {
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			++force;
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		} else if (matches(opt, "-batch") == 0) {
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			argc--;
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			argv++;
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			if (argc <= 1)
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				usage();
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			batch_file = argv[1];
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		} else if (matches(opt, "-brief") == 0) {
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			++brief;
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		} else if (matches(opt, "-json") == 0) {
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			++json;
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		} else if (matches(opt, "-pretty") == 0) {
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			++pretty;
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		} else if (matches(opt, "-rcvbuf") == 0) {
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			unsigned int size;
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			argc--;
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			argv++;
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			if (argc <= 1)
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				usage();
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			if (get_unsigned(&size, argv[1], 0)) {
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				fprintf(stderr, "Invalid rcvbuf size '%s'\n",
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					argv[1]);
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				exit(-1);
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			}
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			rcvbuf = size;
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		} else if (matches_color(opt, &color)) {
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		} else if (matches(opt, "-help") == 0) {
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			usage();
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		} else if (matches(opt, "-netns") == 0) {
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			NEXT_ARG();
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			if (netns_switch(argv[1]))
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				exit(-1);
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		} else if (matches(opt, "-Numeric") == 0) {
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			++numeric;
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		} else if (matches(opt, "-all") == 0) {
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			do_all = true;
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		} else {
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			fprintf(stderr,
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				"Option \"%s\" is unknown, try \"ip -help\".\n",
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				opt);
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			exit(-1);
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		}
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		argc--;	argv++;
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	}
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	_SL_ = oneline ? "\\" : "\n";
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	check_enable_color(color, json);
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	if (batch_file)
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		return batch(batch_file);
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	if (rtnl_open(&rth, 0) < 0)
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		exit(1);
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	rtnl_set_strict_dump(&rth);
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	if (strlen(basename) > 2)
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		return do_cmd(basename+2, argc, argv);
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	if (argc > 1)
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		return do_cmd(argv[1], argc-1, argv+1);
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	rtnl_close(&rth);
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	usage();
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}