text: /* vi: set sw=4 ts=4: */
  /* route
   *
   * Similar to the standard Unix route, but with only the necessary
   * parts for AF_INET and AF_INET6
   *
   * Bjorn Wesen, Axis Communications AB
   *
   * Author of the original route:
   *              Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
   *              (derived from FvK's 'route.c     1.70    01/04/94')
   *
   * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   *
   *
   * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
   * adjustments by Larry Doolittle  <LRDoolittle@lbl.gov>
   *
   * IPV6 support added by Bart Visscher <magick@linux-fan.com>
   */
  
  /* 2004/03/09  Manuel Novoa III <mjn3@codepoet.org>
   *
   * Rewritten to fix several bugs, add additional error checking, and
   * remove ridiculous amounts of bloat.
   */
  
  //usage:#define route_trivial_usage
  //usage:       "[{add|del|delete}]"
  //usage:#define route_full_usage "\n\n"
  //usage:       "Edit kernel routing tables\n"
  //usage:     "\n	-n	Don't resolve names"
  //usage:     "\n	-e	Display other/more information"
  //usage:     "\n	-A inet" IF_FEATURE_IPV6("{6}") "	Select address family"
  
  #include <net/route.h>
  #include <net/if.h>
  
  #include "libbb.h"
  #include "inet_common.h"
  
  
  #ifndef RTF_UP
  /* Keep this in sync with /usr/src/linux/include/linux/route.h */
  #define RTF_UP          0x0001	/* route usable                 */
  #define RTF_GATEWAY     0x0002	/* destination is a gateway     */
  #define RTF_HOST        0x0004	/* host entry (net otherwise)   */
  #define RTF_REINSTATE   0x0008	/* reinstate route after tmout  */
  #define RTF_DYNAMIC     0x0010	/* created dyn. (by redirect)   */
  #define RTF_MODIFIED    0x0020	/* modified dyn. (by redirect)  */
  #define RTF_MTU         0x0040	/* specific MTU for this route  */
  #ifndef RTF_MSS
  #define RTF_MSS         RTF_MTU	/* Compatibility :-(            */
  #endif
  #define RTF_WINDOW      0x0080	/* per route window clamping    */
  #define RTF_IRTT        0x0100	/* Initial round trip time      */
  #define RTF_REJECT      0x0200	/* Reject route                 */
  #endif
  
  #if defined(SIOCADDRTOLD) || defined(RTF_IRTT)	/* route */
  #define HAVE_NEW_ADDRT 1
  #endif
  
  #if HAVE_NEW_ADDRT
  #define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
  #define full_mask(x) (x)
  #else
  #define mask_in_addr(x) ((x).rt_genmask)
  #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
  #endif
  
  /* The RTACTION entries must agree with tbl_verb[] below! */
  #define RTACTION_ADD 1
  #define RTACTION_DEL 2
  
  /* For the various tbl_*[] arrays, the 1st byte is the offset to
   * the next entry and the 2nd byte is return value. */
  
  #define NET_FLAG  1
  #define HOST_FLAG 2
  
  /* We remap '-' to '#' to avoid problems with getopt. */
  static const char tbl_hash_net_host[] ALIGN1 =
  	"\007\001#net\0"
  /*	"\010\002#host\0" */
  	"\007\002#host"				/* Since last, we can save a byte. */
  ;
  
  #define KW_TAKES_ARG            020
  #define KW_SETS_FLAG            040
  
  #define KW_IPVx_METRIC          020
  #define KW_IPVx_NETMASK         021
  #define KW_IPVx_GATEWAY         022
  #define KW_IPVx_MSS             023
  #define KW_IPVx_WINDOW          024
  #define KW_IPVx_IRTT            025
  #define KW_IPVx_DEVICE          026
  
  #define KW_IPVx_FLAG_ONLY       040
  #define KW_IPVx_REJECT          040
  #define KW_IPVx_MOD             041
  #define KW_IPVx_DYN             042
  #define KW_IPVx_REINSTATE       043
  
  static const char tbl_ipvx[] ALIGN1 =
  	/* 020 is the "takes an arg" bit */
  #if HAVE_NEW_ADDRT
  	"\011\020metric\0"
  #endif
  	"\012\021netmask\0"
  	"\005\022gw\0"
  	"\012\022gateway\0"
  	"\006\023mss\0"
  	"\011\024window\0"
  #ifdef RTF_IRTT
  	"\007\025irtt\0"
  #endif
  	"\006\026dev\0"
  	"\011\026device\0"
  	/* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */
  #ifdef RTF_REJECT
  	"\011\040reject\0"
  #endif
  	"\006\041mod\0"
  	"\006\042dyn\0"
  /*	"\014\043reinstate\0" */
  	"\013\043reinstate"			/* Since last, we can save a byte. */
  ;
  
  static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */
  #ifdef RTF_REJECT
  	RTF_REJECT,
  #endif
  	RTF_MODIFIED,
  	RTF_DYNAMIC,
  	RTF_REINSTATE
  };
  
  static int kw_lookup(const char *kwtbl, char ***pargs)
  {
  	if (**pargs) {
  		do {
  			if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */
  				*pargs += 1;
  				if (kwtbl[1] & KW_TAKES_ARG) {
  					if (!**pargs) {	/* No more args! */
  						bb_show_usage();
  					}
  					*pargs += 1; /* Calling routine will use args[-1]. */
  				}
  				return kwtbl[1];
  			}
  			kwtbl += *kwtbl;
  		} while (*kwtbl);
  	}
  	return 0;
  }
  
  /* Add or delete a route, depending on action. */
  
  static NOINLINE void INET_setroute(int action, char **args)
  {
  	/* char buffer instead of bona-fide struct avoids aliasing warning */
  	char rt_buf[sizeof(struct rtentry)];
  	struct rtentry *const rt = (void *)rt_buf;
  
  	const char *netmask = NULL;
  	int skfd, isnet, xflag;
  
  	/* Grab the -net or -host options.  Remember they were transformed. */
  	xflag = kw_lookup(tbl_hash_net_host, &args);
  
  	/* If we did grab -net or -host, make sure we still have an arg left. */
  	if (*args == NULL) {
  		bb_show_usage();
  	}
  
  	/* Clean out the RTREQ structure. */
  	memset(rt, 0, sizeof(*rt));
  
  	{
  		const char *target = *args++;
  		char *prefix;
  
  		/* recognize x.x.x.x/mask format. */
  		prefix = strchr(target, '/');
  		if (prefix) {
  			int prefix_len;
  
  			prefix_len = xatoul_range(prefix+1, 0, 32);
  			mask_in_addr(*rt) = htonl( ~(0xffffffffUL >> prefix_len));
  			*prefix = '\0';
  #if HAVE_NEW_ADDRT
  			rt->rt_genmask.sa_family = AF_INET;
  #endif
  		} else {
  			/* Default netmask. */
  			netmask = "default";
  		}
  		/* Prefer hostname lookup is -host flag (xflag==1) was given. */
  		isnet = INET_resolve(target, (struct sockaddr_in *) &rt->rt_dst,
  							 (xflag & HOST_FLAG));
  		if (isnet < 0) {
  			bb_error_msg_and_die("resolving %s", target);
  		}
  		if (prefix) {
  			/* do not destroy prefix for process args */
  			*prefix = '/';
  		}
  	}
  
  	if (xflag) {		/* Reinit isnet if -net or -host was specified. */
  		isnet = (xflag & NET_FLAG);
  	}
  
  	/* Fill in the other fields. */
  	rt->rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
  
  	while (*args) {
  		int k = kw_lookup(tbl_ipvx, &args);
  		const char *args_m1 = args[-1];
  
  		if (k & KW_IPVx_FLAG_ONLY) {
  			rt->rt_flags |= flags_ipvx[k & 3];
  			continue;
  		}
  
  #if HAVE_NEW_ADDRT
  		if (k == KW_IPVx_METRIC) {
  			rt->rt_metric = xatoul(args_m1) + 1;
  			continue;
  		}
  #endif
  
  		if (k == KW_IPVx_NETMASK) {
  			struct sockaddr mask;
  
  			if (mask_in_addr(*rt)) {
  				bb_show_usage();
  			}
  
  			netmask = args_m1;
  			isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0);
  			if (isnet < 0) {
  				bb_error_msg_and_die("resolving %s", netmask);
  			}
  			rt->rt_genmask = full_mask(mask);
  			continue;
  		}
  
  		if (k == KW_IPVx_GATEWAY) {
  			if (rt->rt_flags & RTF_GATEWAY) {
  				bb_show_usage();
  			}
  
  			isnet = INET_resolve(args_m1,
  						(struct sockaddr_in *) &rt->rt_gateway, 1);
  			rt->rt_flags |= RTF_GATEWAY;
  
  			if (isnet) {
  				if (isnet < 0) {
  					bb_error_msg_and_die("resolving %s", args_m1);
  				}
  				bb_error_msg_and_die("gateway %s is a NETWORK", args_m1);
  			}
  			continue;
  		}
  
  		if (k == KW_IPVx_MSS) {	/* Check valid MSS bounds. */
  			rt->rt_flags |= RTF_MSS;
  			rt->rt_mss = xatoul_range(args_m1, 64, 32768);
  			continue;
  		}
  
  		if (k == KW_IPVx_WINDOW) {	/* Check valid window bounds. */
  			rt->rt_flags |= RTF_WINDOW;
  			rt->rt_window = xatoul_range(args_m1, 128, INT_MAX);
  			continue;
  		}
  
  #ifdef RTF_IRTT
  		if (k == KW_IPVx_IRTT) {
  			rt->rt_flags |= RTF_IRTT;
  			rt->rt_irtt = xatoul(args_m1);
  			rt->rt_irtt *= (sysconf(_SC_CLK_TCK) / 100);	/* FIXME */
  #if 0					/* FIXME: do we need to check anything of this? */
  			if (rt->rt_irtt < 1 || rt->rt_irtt > (120 * HZ)) {
  				bb_error_msg_and_die("bad irtt");
  			}
  #endif
  			continue;
  		}
  #endif
  
  		/* Device is special in that it can be the last arg specified
  		 * and doesn't requre the dev/device keyword in that case. */
  		if (!rt->rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
  			/* Don't use args_m1 here since args may have changed! */
  			rt->rt_dev = args[-1];
  			continue;
  		}
  
  		/* Nothing matched. */
  		bb_show_usage();
  	}
  
  #ifdef RTF_REJECT
  	if ((rt->rt_flags & RTF_REJECT) && !rt->rt_dev) {
  		rt->rt_dev = (char*)"lo";
  	}
  #endif
  
  	/* sanity checks.. */
  	if (mask_in_addr(*rt)) {
  		uint32_t mask = mask_in_addr(*rt);
  
  		mask = ~ntohl(mask);
  		if ((rt->rt_flags & RTF_HOST) && mask != 0xffffffff) {
  			bb_error_msg_and_die("netmask %.8x and host route conflict",
  								 (unsigned int) mask);
  		}
  		if (mask & (mask + 1)) {
  			bb_error_msg_and_die("bogus netmask %s", netmask);
  		}
  		mask = ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr;
  		if (mask & ~(uint32_t)mask_in_addr(*rt)) {
  			bb_error_msg_and_die("netmask and route address conflict");
  		}
  	}
  
  	/* Fill out netmask if still unset */
  	if ((action == RTACTION_ADD) && (rt->rt_flags & RTF_HOST)) {
  		mask_in_addr(*rt) = 0xffffffff;
  	}
  
  	/* Create a socket to the INET kernel. */
  	skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
  
  	if (action == RTACTION_ADD)
  		xioctl(skfd, SIOCADDRT, rt);
  	else
  		xioctl(skfd, SIOCDELRT, rt);
  
  	if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
  }
  
  #if ENABLE_FEATURE_IPV6
  
  static NOINLINE void INET6_setroute(int action, char **args)
  {
  	struct sockaddr_in6 sa6;
  	struct in6_rtmsg rt;
  	int prefix_len, skfd;
  	const char *devname;
  
  		/* We know args isn't NULL from the check in route_main. */
  		const char *target = *args++;
  
  		if (strcmp(target, "default") == 0) {
  			prefix_len = 0;
  			memset(&sa6, 0, sizeof(sa6));
  		} else {
  			char *cp;
  			cp = strchr(target, '/'); /* Yes... const to non is ok. */
  			if (cp) {
  				*cp = '\0';
  				prefix_len = xatoul_range(cp + 1, 0, 128);
  			} else {
  				prefix_len = 128;
  			}
  			if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
  				bb_error_msg_and_die("resolving %s", target);
  			}
  		}
  
  	/* Clean out the RTREQ structure. */
  	memset(&rt, 0, sizeof(rt));
  
  	memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
  
  	/* Fill in the other fields. */
  	rt.rtmsg_dst_len = prefix_len;
  	rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP);
  	rt.rtmsg_metric = 1;
  
  	devname = NULL;
  
  	while (*args) {
  		int k = kw_lookup(tbl_ipvx, &args);
  		const char *args_m1 = args[-1];
  
  		if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) {
  			rt.rtmsg_flags |= flags_ipvx[k & 3];
  			continue;
  		}
  
  		if (k == KW_IPVx_METRIC) {
  			rt.rtmsg_metric = xatoul(args_m1);
  			continue;
  		}
  
  		if (k == KW_IPVx_GATEWAY) {
  			if (rt.rtmsg_flags & RTF_GATEWAY) {
  				bb_show_usage();
  			}
  
  			if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) {
  				bb_error_msg_and_die("resolving %s", args_m1);
  			}
  			memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
  				   sizeof(struct in6_addr));
  			rt.rtmsg_flags |= RTF_GATEWAY;
  			continue;
  		}
  
  		/* Device is special in that it can be the last arg specified
  		 * and doesn't requre the dev/device keyword in that case. */
  		if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
  			/* Don't use args_m1 here since args may have changed! */
  			devname = args[-1];
  			continue;
  		}
  
  		/* Nothing matched. */
  		bb_show_usage();
  	}
  
  	/* Create a socket to the INET6 kernel. */
  	skfd = xsocket(AF_INET6, SOCK_DGRAM, 0);
  
  	rt.rtmsg_ifindex = 0;
  
  	if (devname) {
  		struct ifreq ifr;
  		memset(&ifr, 0, sizeof(ifr));
  		strncpy_IFNAMSIZ(ifr.ifr_name, devname);
  		xioctl(skfd, SIOGIFINDEX, &ifr);
  		rt.rtmsg_ifindex = ifr.ifr_ifindex;
  	}
  
  	/* Tell the kernel to accept this route. */
  	if (action == RTACTION_ADD)
  		xioctl(skfd, SIOCADDRT, &rt);
  	else
  		xioctl(skfd, SIOCDELRT, &rt);
  
  	if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
  }
  #endif
  
  static const unsigned flagvals[] = { /* Must agree with flagchars[]. */
  	RTF_GATEWAY,
  	RTF_HOST,
  	RTF_REINSTATE,
  	RTF_DYNAMIC,
  	RTF_MODIFIED,
  #if ENABLE_FEATURE_IPV6
  	RTF_DEFAULT,
  	RTF_ADDRCONF,
  	RTF_CACHE
  #endif
  };
  
  #define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
  #define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE)
  
  /* Must agree with flagvals[]. */
  static const char flagchars[] ALIGN1 =
  	"GHRDM"
  #if ENABLE_FEATURE_IPV6
  	"DAC"
  #endif
  ;
  
  static void set_flags(char *flagstr, int flags)
  {
  	int i;
  
  	*flagstr++ = 'U';
  
  	for (i = 0; (*flagstr = flagchars[i]) != 0; i++) {
  		if (flags & flagvals[i]) {
  			++flagstr;
  		}
  	}
  }
  
  /* also used in netstat */
  void FAST_FUNC bb_displayroutes(int noresolve, int netstatfmt)
  {
  	char devname[64], flags[16], *sdest, *sgw;
  	unsigned long d, g, m;
  	int flgs, ref, use, metric, mtu, win, ir;
  	struct sockaddr_in s_addr;
  	struct in_addr mask;
  
  	FILE *fp = xfopen_for_read("/proc/net/route");
  
  	printf("Kernel IP routing table\n"
  	       "Destination     Gateway         Genmask         Flags %s Iface\n",
  			netstatfmt ? "  MSS Window  irtt" : "Metric Ref    Use");
  
  	if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */
  		goto ERROR;		   /* Empty or missing line, or read error. */
  	}
  	while (1) {
  		int r;
  		r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
  				   devname, &d, &g, &flgs, &ref, &use, &metric, &m,
  				   &mtu, &win, &ir);
  		if (r != 11) {
  			if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
  				break;
  			}
   ERROR:
  			bb_error_msg_and_die("fscanf");
  		}
  
  		if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */
  			continue;
  		}
  
  		set_flags(flags, (flgs & IPV4_MASK));
  #ifdef RTF_REJECT
  		if (flgs & RTF_REJECT) {
  			flags[0] = '!';
  		}
  #endif
  
  		memset(&s_addr, 0, sizeof(struct sockaddr_in));
  		s_addr.sin_family = AF_INET;
  		s_addr.sin_addr.s_addr = d;
  		sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */
  		s_addr.sin_addr.s_addr = g;
  		sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */
  		mask.s_addr = m;
  		/* "%15.15s" truncates hostnames, do we really want that? */
  		printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
  		free(sdest);
  		free(sgw);
  		if (netstatfmt) {
  			printf("%5d %-5d %6d %s\n", mtu, win, ir, devname);
  		} else {
  			printf("%-6d %-2d %7d %s\n", metric, ref, use, devname);
  		}
  	}
  	fclose(fp);
  }
  
  #if ENABLE_FEATURE_IPV6
  
  static void INET6_displayroutes(void)
  {
  	char addr6[128], *naddr6;
  	/* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses.
  	 * We read the non-delimited strings into the tail of the buffer
  	 * using fscanf and then modify the buffer by shifting forward
  	 * while inserting ':'s and the nul terminator for the first string.
  	 * Hence the strings are at addr6x and addr6x+40.  This generates
  	 * _much_ less code than the previous (upstream) approach. */
  	char addr6x[80];
  	char iface[16], flags[16];
  	int iflags, metric, refcnt, use, prefix_len, slen;
  	struct sockaddr_in6 snaddr6;
  
  	FILE *fp = xfopen_for_read("/proc/net/ipv6_route");
  
  	printf("Kernel IPv6 routing table\n%-44s%-40s"
  			  "Flags Metric Ref    Use Iface\n",
  			  "Destination", "Next Hop");
  
  	while (1) {
  		int r;
  		r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n",
  				addr6x+14, &prefix_len, &slen, addr6x+40+7,
  				&metric, &use, &refcnt, &iflags, iface);
  		if (r != 9) {
  			if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
  				break;
  			}
   ERROR:
  			bb_error_msg_and_die("fscanf");
  		}
  
  		/* Do the addr6x shift-and-insert changes to ':'-delimit addresses.
  		 * For now, always do this to validate the proc route format, even
  		 * if the interface is down. */
  		{
  			int i = 0;
  			char *p = addr6x+14;
  
  			do {
  				if (!*p) {
  					if (i == 40) { /* nul terminator for 1st address? */
  						addr6x[39] = 0;	/* Fixup... need 0 instead of ':'. */
  						++p;	/* Skip and continue. */
  						continue;
  					}
  					goto ERROR;
  				}
  				addr6x[i++] = *p++;
  				if (!((i+1) % 5)) {
  					addr6x[i++] = ':';
  				}
  			} while (i < 40+28+7);
  		}
  
  		if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */
  			continue;
  		}
  
  		set_flags(flags, (iflags & IPV6_MASK));
  
  		r = 0;
  		while (1) {
  			inet_pton(AF_INET6, addr6x + r,
  					  (struct sockaddr *) &snaddr6.sin6_addr);
  			snaddr6.sin6_family = AF_INET6;
  			naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6,
  						   0x0fff /* Apparently, upstream never resolves. */
  						   );
  
  			if (!r) {			/* 1st pass */
  				snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
  				r += 40;
  				free(naddr6);
  			} else {			/* 2nd pass */
  				/* Print the info. */
  				printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
  						addr6, naddr6, flags, metric, refcnt, use, iface);
  				free(naddr6);
  				break;
  			}
  		}
  	}
  	fclose(fp);
  }
  
  #endif
  
  #define ROUTE_OPT_A     0x01
  #define ROUTE_OPT_n     0x02
  #define ROUTE_OPT_e     0x04
  #define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */
  
  /* 1st byte is offset to next entry offset.  2nd byte is return value. */
  /* 2nd byte matches RTACTION_* code */
  static const char tbl_verb[] ALIGN1 =
  	"\006\001add\0"
  	"\006\002del\0"
  /*	"\011\002delete\0" */
  	"\010\002delete"  /* Since it's last, we can save a byte. */
  ;
  
  int route_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  int route_main(int argc UNUSED_PARAM, char **argv)
  {
  	unsigned opt;
  	int what;
  	char *family;
  	char **p;
  
  	/* First, remap '-net' and '-host' to avoid getopt problems. */
  	p = argv;
  	while (*++p) {
  		if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) {
  			p[0][0] = '#';
  		}
  	}
  
  	opt = getopt32(argv, "A:ne", &family);
  
  	if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) {
  #if ENABLE_FEATURE_IPV6
  		if (strcmp(family, "inet6") == 0) {
  			opt |= ROUTE_OPT_INET6;	/* Set flag for ipv6. */
  		} else
  #endif
  		bb_show_usage();
  	}
  
  	argv += optind;
  
  	/* No more args means display the routing table. */
  	if (!*argv) {
  		int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0;
  #if ENABLE_FEATURE_IPV6
  		if (opt & ROUTE_OPT_INET6)
  			INET6_displayroutes();
  		else
  #endif
  			bb_displayroutes(noresolve, opt & ROUTE_OPT_e);
  
  		fflush_stdout_and_exit(EXIT_SUCCESS);
  	}
  
  	/* Check verb.  At the moment, must be add, del, or delete. */
  	what = kw_lookup(tbl_verb, &argv);
  	if (!what || !*argv) {		/* Unknown verb or no more args. */
  		bb_show_usage();
  	}
  
  #if ENABLE_FEATURE_IPV6
  	if (opt & ROUTE_OPT_INET6)
  		INET6_setroute(what, argv);
  	else
  #endif
  		INET_setroute(what, argv);
  
  	return EXIT_SUCCESS;
  }
  