Added the ifconfig command.

1 files changed, 1185 insertions, 0 deletions

diff --git a/freebsd-userspace/commands/sbin/ifconfig/ifconfig.c b/freebsd-userspace/commands/sbin/ifconfig/ifconfig.c
new file mode 100644
index 00000000..f0c77d11
--- /dev/null
+++ b/freebsd-userspace/commands/sbin/ifconfig/ifconfig.c
@@ -0,0 +1,1185 @@
+/*
+ * Copyright (c) 1983, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1983, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)ifconfig.c	8.2 (Berkeley) 2/16/94";
+#endif
+static const char rcsid[] =
+  "$FreeBSD$";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#ifdef __rtems__
+#include <freebsd/sys/module.h>
+#include <freebsd/sys/linker.h>
+#else
+#include <sys/module.h>
+#include <sys/linker.h>
+#endif
+
+#include <net/ethernet.h>
+#include <net/if.h>
+#ifdef __rtems__
+#include <freebsd/net/if_var.h>
+#else
+#include <net/if_var.h>
+#endif
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/route.h>
+
+/* IP */
+#include <netinet/in.h>
+#ifdef __rtems__
+#include <freebsd/netinet/in_var.h>
+#else
+#include <netinet/in_var.h>
+#endif
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include <ifaddrs.h>
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#ifndef __rtems__
+#include <jail.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "ifconfig.h"
+
+/*
+ * Since "struct ifreq" is composed of various union members, callers
+ * should pay special attention to interprete the value.
+ * (.e.g. little/big endian difference in the structure.)
+ */
+struct	ifreq ifr;
+
+char	name[IFNAMSIZ];
+char	*descr = NULL;
+size_t	descrlen = 64;
+int	setaddr;
+int	setmask;
+int	doalias;
+int	clearaddr;
+int	newaddr = 1;
+int	verbose;
+int	noload;
+
+int	supmedia = 0;
+int	printkeys = 0;		/* Print keying material for interfaces. */
+
+static	int ifconfig(int argc, char *const *argv, int iscreate,
+		const struct afswtch *afp);
+static	void status(const struct afswtch *afp, const struct sockaddr_dl *sdl,
+		struct ifaddrs *ifa);
+static	void tunnel_status(int s);
+static	void usage(void);
+
+static struct afswtch *af_getbyname(const char *name);
+static struct afswtch *af_getbyfamily(int af);
+static void af_other_status(int);
+
+static struct option *opts = NULL;
+
+void
+opt_register(struct option *p)
+{
+	p->next = opts;
+	opts = p;
+}
+
+static void
+usage(void)
+{
+	char options[1024];
+	struct option *p;
+
+	/* XXX not right but close enough for now */
+	options[0] = '\0';
+	for (p = opts; p != NULL; p = p->next) {
+		strlcat(options, p->opt_usage, sizeof(options));
+		strlcat(options, " ", sizeof(options));
+	}
+
+	fprintf(stderr,
+	"usage: ifconfig %sinterface address_family [address [dest_address]]\n"
+	"                [parameters]\n"
+	"       ifconfig interface create\n"
+	"       ifconfig -a %s[-d] [-m] [-u] [-v] [address_family]\n"
+	"       ifconfig -l [-d] [-u] [address_family]\n"
+	"       ifconfig %s[-d] [-m] [-u] [-v]\n",
+		options, options, options);
+	exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int c, all, namesonly, downonly, uponly;
+	const struct afswtch *afp = NULL;
+	int ifindex;
+	struct ifaddrs *ifap, *ifa;
+	struct ifreq paifr;
+	const struct sockaddr_dl *sdl;
+	char options[1024], *cp;
+	const char *ifname;
+	struct option *p;
+	size_t iflen;
+
+	all = downonly = uponly = namesonly = noload = verbose = 0;
+
+	/* Parse leading line options */
+	strlcpy(options, "adklmnuv", sizeof(options));
+	for (p = opts; p != NULL; p = p->next)
+		strlcat(options, p->opt, sizeof(options));
+	while ((c = getopt(argc, argv, options)) != -1) {
+		switch (c) {
+		case 'a':	/* scan all interfaces */
+			all++;
+			break;
+		case 'd':	/* restrict scan to "down" interfaces */
+			downonly++;
+			break;
+		case 'k':
+			printkeys++;
+			break;
+		case 'l':	/* scan interface names only */
+			namesonly++;
+			break;
+		case 'm':	/* show media choices in status */
+			supmedia = 1;
+			break;
+		case 'n':	/* suppress module loading */
+			noload++;
+			break;
+		case 'u':	/* restrict scan to "up" interfaces */
+			uponly++;
+			break;
+		case 'v':
+			verbose++;
+			break;
+		default:
+			for (p = opts; p != NULL; p = p->next)
+				if (p->opt[0] == c) {
+					p->cb(optarg);
+					break;
+				}
+			if (p == NULL)
+				usage();
+			break;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	/* -l cannot be used with -a or -m */
+	if (namesonly && (all || supmedia))
+		usage();
+
+	/* nonsense.. */
+	if (uponly && downonly)
+		usage();
+
+	/* no arguments is equivalent to '-a' */
+	if (!namesonly && argc < 1)
+		all = 1;
+
+	/* -a and -l allow an address family arg to limit the output */
+	if (all || namesonly) {
+		if (argc > 1)
+			usage();
+
+		ifname = NULL;
+		ifindex = 0;
+		if (argc == 1) {
+			afp = af_getbyname(*argv);
+			if (afp == NULL)
+				usage();
+			if (afp->af_name != NULL)
+				argc--, argv++;
+			/* leave with afp non-zero */
+		}
+	} else {
+		/* not listing, need an argument */
+		if (argc < 1)
+			usage();
+
+		ifname = *argv;
+		argc--, argv++;
+
+		/* check and maybe load support for this interface */
+		ifmaybeload(ifname);
+
+		ifindex = if_nametoindex(ifname);
+		if (ifindex == 0) {
+			/*
+			 * NOTE:  We must special-case the `create' command
+			 * right here as we would otherwise fail when trying
+			 * to find the interface.
+			 */
+			if (argc > 0 && (strcmp(argv[0], "create") == 0 ||
+			    strcmp(argv[0], "plumb") == 0)) {
+				iflen = strlcpy(name, ifname, sizeof(name));
+				if (iflen >= sizeof(name))
+					errx(1, "%s: cloning name too long",
+					    ifname);
+				ifconfig(argc, argv, 1, NULL);
+				exit(0);
+			}
+			/*
+			 * NOTE:  We have to special-case the `-vnet' command
+			 * right here as we would otherwise fail when trying
+			 * to find the interface as it lives in another vnet.
+			 */
+			if (argc > 0 && (strcmp(argv[0], "-vnet") == 0)) {
+				iflen = strlcpy(name, ifname, sizeof(name));
+				if (iflen >= sizeof(name))
+					errx(1, "%s: interface name too long",
+					    ifname);
+				ifconfig(argc, argv, 0, NULL);
+				exit(0);
+			}
+			errx(1, "interface %s does not exist", ifname);
+		}
+	}
+
+	/* Check for address family */
+	if (argc > 0) {
+		afp = af_getbyname(*argv);
+		if (afp != NULL)
+			argc--, argv++;
+	}
+
+	if (getifaddrs(&ifap) != 0)
+		err(EXIT_FAILURE, "getifaddrs");
+	cp = NULL;
+	ifindex = 0;
+	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
+		memset(&paifr, 0, sizeof(paifr));
+		strncpy(paifr.ifr_name, ifa->ifa_name, sizeof(paifr.ifr_name));
+		if (sizeof(paifr.ifr_addr) >= ifa->ifa_addr->sa_len) {
+			memcpy(&paifr.ifr_addr, ifa->ifa_addr,
+			    ifa->ifa_addr->sa_len);
+		}
+
+		if (ifname != NULL && strcmp(ifname, ifa->ifa_name) != 0)
+			continue;
+		if (ifa->ifa_addr->sa_family == AF_LINK)
+			sdl = (const struct sockaddr_dl *) ifa->ifa_addr;
+		else
+			sdl = NULL;
+		if (cp != NULL && strcmp(cp, ifa->ifa_name) == 0)
+			continue;
+		iflen = strlcpy(name, ifa->ifa_name, sizeof(name));
+		if (iflen >= sizeof(name)) {
+			warnx("%s: interface name too long, skipping",
+			    ifa->ifa_name);
+			continue;
+		}
+		cp = ifa->ifa_name;
+
+		if (downonly && (ifa->ifa_flags & IFF_UP) != 0)
+			continue;
+		if (uponly && (ifa->ifa_flags & IFF_UP) == 0)
+			continue;
+		ifindex++;
+		/*
+		 * Are we just listing the interfaces?
+		 */
+		if (namesonly) {
+			if (ifindex > 1)
+				printf(" ");
+			fputs(name, stdout);
+			continue;
+		}
+
+		if (argc > 0)
+			ifconfig(argc, argv, 0, afp);
+		else
+			status(afp, sdl, ifa);
+	}
+	if (namesonly)
+		printf("\n");
+	freeifaddrs(ifap);
+
+	exit(0);
+}
+
+static struct afswtch *afs = NULL;
+
+void
+af_register(struct afswtch *p)
+{
+	p->af_next = afs;
+	afs = p;
+}
+
+static struct afswtch *
+af_getbyname(const char *name)
+{
+	struct afswtch *afp;
+
+	for (afp = afs; afp !=  NULL; afp = afp->af_next)
+		if (strcmp(afp->af_name, name) == 0)
+			return afp;
+	return NULL;
+}
+
+static struct afswtch *
+af_getbyfamily(int af)
+{
+	struct afswtch *afp;
+
+	for (afp = afs; afp != NULL; afp = afp->af_next)
+		if (afp->af_af == af)
+			return afp;
+	return NULL;
+}
+
+static void
+af_other_status(int s)
+{
+	struct afswtch *afp;
+	uint8_t afmask[howmany(AF_MAX, NBBY)];
+
+	memset(afmask, 0, sizeof(afmask));
+	for (afp = afs; afp != NULL; afp = afp->af_next) {
+		if (afp->af_other_status == NULL)
+			continue;
+		if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
+			continue;
+		afp->af_other_status(s);
+		setbit(afmask, afp->af_af);
+	}
+}
+
+static void
+af_all_tunnel_status(int s)
+{
+	struct afswtch *afp;
+	uint8_t afmask[howmany(AF_MAX, NBBY)];
+
+	memset(afmask, 0, sizeof(afmask));
+	for (afp = afs; afp != NULL; afp = afp->af_next) {
+		if (afp->af_status_tunnel == NULL)
+			continue;
+		if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
+			continue;
+		afp->af_status_tunnel(s);
+		setbit(afmask, afp->af_af);
+	}
+}
+
+static struct cmd *cmds = NULL;
+
+void
+cmd_register(struct cmd *p)
+{
+	p->c_next = cmds;
+	cmds = p;
+}
+
+static const struct cmd *
+cmd_lookup(const char *name, int iscreate)
+{
+#define	N(a)	(sizeof(a)/sizeof(a[0]))
+	const struct cmd *p;
+
+	for (p = cmds; p != NULL; p = p->c_next)
+		if (strcmp(name, p->c_name) == 0) {
+			if (iscreate) {
+				if (p->c_iscloneop)
+					return p;
+			} else {
+				if (!p->c_iscloneop)
+					return p;
+			}
+		}
+	return NULL;
+#undef N
+}
+
+struct callback {
+	callback_func *cb_func;
+	void	*cb_arg;
+	struct callback *cb_next;
+};
+static struct callback *callbacks = NULL;
+
+void
+callback_register(callback_func *func, void *arg)
+{
+	struct callback *cb;
+
+	cb = malloc(sizeof(struct callback));
+	if (cb == NULL)
+		errx(1, "unable to allocate memory for callback");
+	cb->cb_func = func;
+	cb->cb_arg = arg;
+	cb->cb_next = callbacks;
+	callbacks = cb;
+}
+
+/* specially-handled commands */
+static void setifaddr(const char *, int, int, const struct afswtch *);
+static const struct cmd setifaddr_cmd = DEF_CMD("ifaddr", 0, setifaddr);
+
+static void setifdstaddr(const char *, int, int, const struct afswtch *);
+static const struct cmd setifdstaddr_cmd =
+	DEF_CMD("ifdstaddr", 0, setifdstaddr);
+
+static int
+ifconfig(int argc, char *const *argv, int iscreate, const struct afswtch *uafp)
+{
+	const struct afswtch *afp, *nafp;
+	const struct cmd *p;
+	struct callback *cb;
+	int s;
+
+	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
+	afp = uafp != NULL ? uafp : af_getbyname("inet");
+top:
+	ifr.ifr_addr.sa_family =
+		afp->af_af == AF_LINK || afp->af_af == AF_UNSPEC ?
+		AF_LOCAL : afp->af_af;
+
+	if ((s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0)) < 0 &&
+	    (uafp != NULL || errno != EPROTONOSUPPORT ||
+	     (s = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0))
+		err(1, "socket(family %u,SOCK_DGRAM", ifr.ifr_addr.sa_family);
+
+	while (argc > 0) {
+		p = cmd_lookup(*argv, iscreate);
+		if (iscreate && p == NULL) {
+			/*
+			 * Push the clone create callback so the new
+			 * device is created and can be used for any
+			 * remaining arguments.
+			 */
+			cb = callbacks;
+			if (cb == NULL)
+				errx(1, "internal error, no callback");
+			callbacks = cb->cb_next;
+			cb->cb_func(s, cb->cb_arg);
+			iscreate = 0;
+			/*
+			 * Handle any address family spec that
+			 * immediately follows and potentially
+			 * recreate the socket.
+			 */
+			nafp = af_getbyname(*argv);
+			if (nafp != NULL) {
+				argc--, argv++;
+				if (nafp != afp) {
+					close(s);
+					afp = nafp;
+					goto top;
+				}
+			}
+			/*
+			 * Look for a normal parameter.
+			 */
+			continue;
+		}
+		if (p == NULL) {
+			/*
+			 * Not a recognized command, choose between setting
+			 * the interface address and the dst address.
+			 */
+			p = (setaddr ? &setifdstaddr_cmd : &setifaddr_cmd);
+		}
+		if (p->c_u.c_func || p->c_u.c_func2) {
+			if (p->c_parameter == NEXTARG) {
+				if (argv[1] == NULL)
+					errx(1, "'%s' requires argument",
+					    p->c_name);
+				p->c_u.c_func(argv[1], 0, s, afp);
+				argc--, argv++;
+			} else if (p->c_parameter == OPTARG) {
+				p->c_u.c_func(argv[1], 0, s, afp);
+				if (argv[1] != NULL)
+					argc--, argv++;
+			} else if (p->c_parameter == NEXTARG2) {
+				if (argc < 3)
+					errx(1, "'%s' requires 2 arguments",
+					    p->c_name);
+				p->c_u.c_func2(argv[1], argv[2], s, afp);
+				argc -= 2, argv += 2;
+			} else
+				p->c_u.c_func(*argv, p->c_parameter, s, afp);
+		}
+		argc--, argv++;
+	}
+
+	/*
+	 * Do any post argument processing required by the address family.
+	 */
+	if (afp->af_postproc != NULL)
+		afp->af_postproc(s, afp);
+	/*
+	 * Do deferred callbacks registered while processing
+	 * command-line arguments.
+	 */
+	for (cb = callbacks; cb != NULL; cb = cb->cb_next)
+		cb->cb_func(s, cb->cb_arg);
+	/*
+	 * Do deferred operations.
+	 */
+	if (clearaddr) {
+		if (afp->af_ridreq == NULL || afp->af_difaddr == 0) {
+			warnx("interface %s cannot change %s addresses!",
+			      name, afp->af_name);
+			clearaddr = 0;
+		}
+	}
+	if (clearaddr) {
+		int ret;
+		strncpy(afp->af_ridreq, name, sizeof ifr.ifr_name);
+		ret = ioctl(s, afp->af_difaddr, afp->af_ridreq);
+		if (ret < 0) {
+			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
+				/* means no previous address for interface */
+			} else
+				Perror("ioctl (SIOCDIFADDR)");
+		}
+	}
+	if (newaddr) {
+		if (afp->af_addreq == NULL || afp->af_aifaddr == 0) {
+			warnx("interface %s cannot change %s addresses!",
+			      name, afp->af_name);
+			newaddr = 0;
+		}
+	}
+	if (newaddr && (setaddr || setmask)) {
+		strncpy(afp->af_addreq, name, sizeof ifr.ifr_name);
+		if (ioctl(s, afp->af_aifaddr, afp->af_addreq) < 0)
+			Perror("ioctl (SIOCAIFADDR)");
+	}
+
+	close(s);
+	return(0);
+}
+
+/*ARGSUSED*/
+static void
+setifaddr(const char *addr, int param, int s, const struct afswtch *afp)
+{
+	if (afp->af_getaddr == NULL)
+		return;
+	/*
+	 * Delay the ioctl to set the interface addr until flags are all set.
+	 * The address interpretation may depend on the flags,
+	 * and the flags may change when the address is set.
+	 */
+	setaddr++;
+	if (doalias == 0 && afp->af_af != AF_LINK)
+		clearaddr = 1;
+	afp->af_getaddr(addr, (doalias >= 0 ? ADDR : RIDADDR));
+}
+
+static void
+settunnel(const char *src, const char *dst, int s, const struct afswtch *afp)
+{
+	struct addrinfo *srcres, *dstres;
+	int ecode;
+
+	if (afp->af_settunnel == NULL) {
+		warn("address family %s does not support tunnel setup",
+			afp->af_name);
+		return;
+	}
+
+	if ((ecode = getaddrinfo(src, NULL, NULL, &srcres)) != 0)
+		errx(1, "error in parsing address string: %s",
+		    gai_strerror(ecode));
+
+	if ((ecode = getaddrinfo(dst, NULL, NULL, &dstres)) != 0)  
+		errx(1, "error in parsing address string: %s",
+		    gai_strerror(ecode));
+
+	if (srcres->ai_addr->sa_family != dstres->ai_addr->sa_family)
+		errx(1,
+		    "source and destination address families do not match");
+
+	afp->af_settunnel(s, srcres, dstres);
+
+	freeaddrinfo(srcres);
+	freeaddrinfo(dstres);
+}
+
+/* ARGSUSED */
+static void
+deletetunnel(const char *vname, int param, int s, const struct afswtch *afp)
+{
+
+	if (ioctl(s, SIOCDIFPHYADDR, &ifr) < 0)
+		err(1, "SIOCDIFPHYADDR");
+}
+
+static void
+setifvnet(const char *jname, int dummy __unused, int s,
+    const struct afswtch *afp)
+{
+	struct ifreq my_ifr;
+
+	memcpy(&my_ifr, &ifr, sizeof(my_ifr));
+	my_ifr.ifr_jid = jail_getid(jname);
+#ifndef __rtems__
+	if (my_ifr.ifr_jid < 0)
+		errx(1, "%s", jail_errmsg);
+#endif
+	if (ioctl(s, SIOCSIFVNET, &my_ifr) < 0)
+		err(1, "SIOCSIFVNET");
+}
+
+static void
+setifrvnet(const char *jname, int dummy __unused, int s,
+    const struct afswtch *afp)
+{
+	struct ifreq my_ifr;
+
+	memcpy(&my_ifr, &ifr, sizeof(my_ifr));
+	my_ifr.ifr_jid = jail_getid(jname);
+#ifndef __rtems__
+	if (my_ifr.ifr_jid < 0)
+		errx(1, "%s", jail_errmsg);
+#endif
+	if (ioctl(s, SIOCSIFRVNET, &my_ifr) < 0)
+		err(1, "SIOCSIFRVNET(%d, %s)", my_ifr.ifr_jid, my_ifr.ifr_name);
+}
+
+static void
+setifnetmask(const char *addr, int dummy __unused, int s,
+    const struct afswtch *afp)
+{
+	if (afp->af_getaddr != NULL) {
+		setmask++;
+		afp->af_getaddr(addr, MASK);
+	}
+}
+
+static void
+setifbroadaddr(const char *addr, int dummy __unused, int s,
+    const struct afswtch *afp)
+{
+	if (afp->af_getaddr != NULL)
+		afp->af_getaddr(addr, DSTADDR);
+}
+
+static void
+setifipdst(const char *addr, int dummy __unused, int s,
+    const struct afswtch *afp)
+{
+	const struct afswtch *inet;
+
+	inet = af_getbyname("inet");
+	if (inet == NULL)
+		return;
+	inet->af_getaddr(addr, DSTADDR);
+	clearaddr = 0;
+	newaddr = 0;
+}
+
+static void
+notealias(const char *addr, int param, int s, const struct afswtch *afp)
+{
+#define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
+	if (setaddr && doalias == 0 && param < 0)
+		if (afp->af_addreq != NULL && afp->af_ridreq != NULL)
+			bcopy((caddr_t)rqtosa(af_addreq),
+			      (caddr_t)rqtosa(af_ridreq),
+			      rqtosa(af_addreq)->sa_len);
+	doalias = param;
+	if (param < 0) {
+		clearaddr = 1;
+		newaddr = 0;
+	} else
+		clearaddr = 0;
+#undef rqtosa
+}
+
+/*ARGSUSED*/
+static void
+setifdstaddr(const char *addr, int param __unused, int s, 
+    const struct afswtch *afp)
+{
+	if (afp->af_getaddr != NULL)
+		afp->af_getaddr(addr, DSTADDR);
+}
+
+/*
+ * Note: doing an SIOCIGIFFLAGS scribbles on the union portion
+ * of the ifreq structure, which may confuse other parts of ifconfig.
+ * Make a private copy so we can avoid that.
+ */
+static void
+setifflags(const char *vname, int value, int s, const struct afswtch *afp)
+{
+	struct ifreq		my_ifr;
+	int flags;
+
+	memset(&my_ifr, 0, sizeof(my_ifr));
+	(void) strlcpy(my_ifr.ifr_name, name, sizeof(my_ifr.ifr_name));
+
+ 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&my_ifr) < 0) {
+ 		Perror("ioctl (SIOCGIFFLAGS)");
+ 		exit(1);
+ 	}
+	flags = (my_ifr.ifr_flags & 0xffff) | (my_ifr.ifr_flagshigh << 16);
+
+	if (value < 0) {
+		value = -value;
+		flags &= ~value;
+	} else
+		flags |= value;
+	my_ifr.ifr_flags = flags & 0xffff;
+	my_ifr.ifr_flagshigh = flags >> 16;
+	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&my_ifr) < 0)
+		Perror(vname);
+}
+
+void
+setifcap(const char *vname, int value, int s, const struct afswtch *afp)
+{
+	int flags;
+
+ 	if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) < 0) {
+ 		Perror("ioctl (SIOCGIFCAP)");
+ 		exit(1);
+ 	}
+	flags = ifr.ifr_curcap;
+	if (value < 0) {
+		value = -value;
+		flags &= ~value;
+	} else
+		flags |= value;
+	flags &= ifr.ifr_reqcap;
+	ifr.ifr_reqcap = flags;
+	if (ioctl(s, SIOCSIFCAP, (caddr_t)&ifr) < 0)
+		Perror(vname);
+}
+
+static void
+setifmetric(const char *val, int dummy __unused, int s, 
+    const struct afswtch *afp)
+{
+	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
+	ifr.ifr_metric = atoi(val);
+	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
+		warn("ioctl (set metric)");
+}
+
+static void
+setifmtu(const char *val, int dummy __unused, int s, 
+    const struct afswtch *afp)
+{
+	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
+	ifr.ifr_mtu = atoi(val);
+	if (ioctl(s, SIOCSIFMTU, (caddr_t)&ifr) < 0)
+		warn("ioctl (set mtu)");
+}
+
+static void
+setifname(const char *val, int dummy __unused, int s, 
+    const struct afswtch *afp)
+{
+	char *newname;
+
+	newname = strdup(val);
+	if (newname == NULL) {
+		warn("no memory to set ifname");
+		return;
+	}
+	ifr.ifr_data = newname;
+	if (ioctl(s, SIOCSIFNAME, (caddr_t)&ifr) < 0) {
+		warn("ioctl (set name)");
+		free(newname);
+		return;
+	}
+	strlcpy(name, newname, sizeof(name));
+	free(newname);
+}
+
+/* ARGSUSED */
+static void
+setifdescr(const char *val, int dummy __unused, int s, 
+    const struct afswtch *afp)
+{
+	char *newdescr;
+
+	ifr.ifr_buffer.length = strlen(val) + 1;
+	if (ifr.ifr_buffer.length == 1) {
+		ifr.ifr_buffer.buffer = newdescr = NULL;
+		ifr.ifr_buffer.length = 0;
+	} else {
+		newdescr = strdup(val);
+		ifr.ifr_buffer.buffer = newdescr;
+		if (newdescr == NULL) {
+			warn("no memory to set ifdescr");
+			return;
+		}
+	}
+
+	if (ioctl(s, SIOCSIFDESCR, (caddr_t)&ifr) < 0)
+		warn("ioctl (set descr)");
+
+	free(newdescr);
+}
+
+/* ARGSUSED */
+static void
+unsetifdescr(const char *val, int value, int s, const struct afswtch *afp)
+{
+
+	setifdescr("", 0, s, 0);
+}
+
+#define	IFFBITS \
+"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6SMART\7RUNNING" \
+"\10NOARP\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2" \
+"\20MULTICAST\22PPROMISC\23MONITOR\24STATICARP"
+
+#define	IFCAPBITS \
+"\020\1RXCSUM\2TXCSUM\3NETCONS\4VLAN_MTU\5VLAN_HWTAGGING\6JUMBO_MTU\7POLLING" \
+"\10VLAN_HWCSUM\11TSO4\12TSO6\13LRO\14WOL_UCAST\15WOL_MCAST\16WOL_MAGIC" \
+"\21VLAN_HWFILTER\23VLAN_HWTSO\24LINKSTATE"
+
+/*
+ * Print the status of the interface.  If an address family was
+ * specified, show only it; otherwise, show them all.
+ */
+static void
+status(const struct afswtch *afp, const struct sockaddr_dl *sdl,
+	struct ifaddrs *ifa)
+{
+	struct ifaddrs *ift;
+	int allfamilies, s;
+	struct ifstat ifs;
+
+	if (afp == NULL) {
+		allfamilies = 1;
+		ifr.ifr_addr.sa_family = AF_LOCAL;
+	} else {
+		allfamilies = 0;
+		ifr.ifr_addr.sa_family =
+		    afp->af_af == AF_LINK ? AF_LOCAL : afp->af_af;
+	}
+	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+
+	s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0);
+	if (s < 0)
+		err(1, "socket(family %u,SOCK_DGRAM)", ifr.ifr_addr.sa_family);
+
+	printf("%s: ", name);
+	printb("flags", ifa->ifa_flags, IFFBITS);
+	if (ioctl(s, SIOCGIFMETRIC, &ifr) != -1)
+		printf(" metric %d", ifr.ifr_metric);
+	if (ioctl(s, SIOCGIFMTU, &ifr) != -1)
+		printf(" mtu %d", ifr.ifr_mtu);
+	putchar('\n');
+
+	for (;;) {
+		if ((descr = reallocf(descr, descrlen)) != NULL) {
+			ifr.ifr_buffer.buffer = descr;
+			ifr.ifr_buffer.length = descrlen;
+			if (ioctl(s, SIOCGIFDESCR, &ifr) == 0) {
+				if (ifr.ifr_buffer.buffer == descr) {
+					if (strlen(descr) > 0)
+						printf("\tdescription: %s\n",
+						    descr);
+				} else if (ifr.ifr_buffer.length > descrlen) {
+					descrlen = ifr.ifr_buffer.length;
+					continue;
+				}
+			}
+		} else
+			warn("unable to allocate memory for interface"
+			    "description");
+		break;
+	}
+
+	if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) == 0) {
+		if (ifr.ifr_curcap != 0) {
+			printb("\toptions", ifr.ifr_curcap, IFCAPBITS);
+			putchar('\n');
+		}
+		if (supmedia && ifr.ifr_reqcap != 0) {
+			printb("\tcapabilities", ifr.ifr_reqcap, IFCAPBITS);
+			putchar('\n');
+		}
+	}
+
+	tunnel_status(s);
+
+	for (ift = ifa; ift != NULL; ift = ift->ifa_next) {
+		if (ift->ifa_addr == NULL)
+			continue;
+		if (strcmp(ifa->ifa_name, ift->ifa_name) != 0)
+			continue;
+		if (allfamilies) {
+			const struct afswtch *p;
+			p = af_getbyfamily(ift->ifa_addr->sa_family);
+			if (p != NULL && p->af_status != NULL)
+				p->af_status(s, ift);
+		} else if (afp->af_af == ift->ifa_addr->sa_family)
+			afp->af_status(s, ift);
+	}
+#if 0
+	if (allfamilies || afp->af_af == AF_LINK) {
+		const struct afswtch *lafp;
+
+		/*
+		 * Hack; the link level address is received separately
+		 * from the routing information so any address is not
+		 * handled above.  Cobble together an entry and invoke
+		 * the status method specially.
+		 */
+		lafp = af_getbyname("lladdr");
+		if (lafp != NULL) {
+			info.rti_info[RTAX_IFA] = (struct sockaddr *)sdl;
+			lafp->af_status(s, &info);
+		}
+	}
+#endif
+	if (allfamilies)
+		af_other_status(s);
+	else if (afp->af_other_status != NULL)
+		afp->af_other_status(s);
+
+	strncpy(ifs.ifs_name, name, sizeof ifs.ifs_name);
+	if (ioctl(s, SIOCGIFSTATUS, &ifs) == 0) 
+		printf("%s", ifs.ascii);
+
+	close(s);
+	return;
+}
+
+static void
+tunnel_status(int s)
+{
+	af_all_tunnel_status(s);
+}
+
+void
+Perror(const char *cmd)
+{
+	switch (errno) {
+
+	case ENXIO:
+		errx(1, "%s: no such interface", cmd);
+		break;
+
+	case EPERM:
+		errx(1, "%s: permission denied", cmd);
+		break;
+
+	default:
+		err(1, "%s", cmd);
+	}
+}
+
+/*
+ * Print a value a la the %b format of the kernel's printf
+ */
+void
+printb(const char *s, unsigned v, const char *bits)
+{
+	int i, any = 0;
+	char c;
+
+	if (bits && *bits == 8)
+		printf("%s=%o", s, v);
+	else
+		printf("%s=%x", s, v);
+	bits++;
+	if (bits) {
+		putchar('<');
+		while ((i = *bits++) != '\0') {
+			if (v & (1 << (i-1))) {
+				if (any)
+					putchar(',');
+				any = 1;
+				for (; (c = *bits) > 32; bits++)
+					putchar(c);
+			} else
+				for (; *bits > 32; bits++)
+					;
+		}
+		putchar('>');
+	}
+}
+
+void
+ifmaybeload(const char *name)
+{
+#define MOD_PREFIX_LEN		3	/* "if_" */
+	struct module_stat mstat;
+	int fileid, modid;
+	char ifkind[IFNAMSIZ + MOD_PREFIX_LEN], ifname[IFNAMSIZ], *dp;
+	const char *cp;
+
+	/* loading suppressed by the user */
+	if (noload)
+		return;
+
+	/* trim the interface number off the end */
+	strlcpy(ifname, name, sizeof(ifname));
+	for (dp = ifname; *dp != 0; dp++)
+		if (isdigit(*dp)) {
+			*dp = 0;
+			break;
+		}
+
+	/* turn interface and unit into module name */
+	strcpy(ifkind, "if_");
+	strlcpy(ifkind + MOD_PREFIX_LEN, ifname,
+	    sizeof(ifkind) - MOD_PREFIX_LEN);
+
+	/* scan files in kernel */
+	mstat.version = sizeof(struct module_stat);
+	for (fileid = kldnext(0); fileid > 0; fileid = kldnext(fileid)) {
+		/* scan modules in file */
+		for (modid = kldfirstmod(fileid); modid > 0;
+		     modid = modfnext(modid)) {
+			if (modstat(modid, &mstat) < 0)
+				continue;
+			/* strip bus name if present */
+			if ((cp = strchr(mstat.name, '/')) != NULL) {
+				cp++;
+			} else {
+				cp = mstat.name;
+			}
+			/* already loaded? */
+			if (strncmp(ifname, cp, strlen(ifname) + 1) == 0 ||
+			    strncmp(ifkind, cp, strlen(ifkind) + 1) == 0)
+				return;
+		}
+	}
+
+	/* not present, we should try to load it */
+	kldload(ifkind);
+}
+
+static struct cmd basic_cmds[] = {
+	DEF_CMD("up",		IFF_UP,		setifflags),
+	DEF_CMD("down",		-IFF_UP,	setifflags),
+	DEF_CMD("arp",		-IFF_NOARP,	setifflags),
+	DEF_CMD("-arp",		IFF_NOARP,	setifflags),
+	DEF_CMD("debug",	IFF_DEBUG,	setifflags),
+	DEF_CMD("-debug",	-IFF_DEBUG,	setifflags),
+	DEF_CMD_ARG("description",		setifdescr),
+	DEF_CMD_ARG("descr",			setifdescr),
+	DEF_CMD("-description",	0,		unsetifdescr),
+	DEF_CMD("-descr",	0,		unsetifdescr),
+	DEF_CMD("promisc",	IFF_PPROMISC,	setifflags),
+	DEF_CMD("-promisc",	-IFF_PPROMISC,	setifflags),
+	DEF_CMD("add",		IFF_UP,		notealias),
+	DEF_CMD("alias",	IFF_UP,		notealias),
+	DEF_CMD("-alias",	-IFF_UP,	notealias),
+	DEF_CMD("delete",	-IFF_UP,	notealias),
+	DEF_CMD("remove",	-IFF_UP,	notealias),
+#ifdef notdef
+#define	EN_SWABIPS	0x1000
+	DEF_CMD("swabips",	EN_SWABIPS,	setifflags),
+	DEF_CMD("-swabips",	-EN_SWABIPS,	setifflags),
+#endif
+	DEF_CMD_ARG("netmask",			setifnetmask),
+	DEF_CMD_ARG("metric",			setifmetric),
+	DEF_CMD_ARG("broadcast",		setifbroadaddr),
+	DEF_CMD_ARG("ipdst",			setifipdst),
+	DEF_CMD_ARG2("tunnel",			settunnel),
+	DEF_CMD("-tunnel", 0,			deletetunnel),
+	DEF_CMD("deletetunnel", 0,		deletetunnel),
+	DEF_CMD_ARG("vnet",			setifvnet),
+	DEF_CMD_ARG("-vnet",			setifrvnet),
+	DEF_CMD("link0",	IFF_LINK0,	setifflags),
+	DEF_CMD("-link0",	-IFF_LINK0,	setifflags),
+	DEF_CMD("link1",	IFF_LINK1,	setifflags),
+	DEF_CMD("-link1",	-IFF_LINK1,	setifflags),
+	DEF_CMD("link2",	IFF_LINK2,	setifflags),
+	DEF_CMD("-link2",	-IFF_LINK2,	setifflags),
+	DEF_CMD("monitor",	IFF_MONITOR,	setifflags),
+	DEF_CMD("-monitor",	-IFF_MONITOR,	setifflags),
+	DEF_CMD("staticarp",	IFF_STATICARP,	setifflags),
+	DEF_CMD("-staticarp",	-IFF_STATICARP,	setifflags),
+	DEF_CMD("rxcsum",	IFCAP_RXCSUM,	setifcap),
+	DEF_CMD("-rxcsum",	-IFCAP_RXCSUM,	setifcap),
+	DEF_CMD("txcsum",	IFCAP_TXCSUM,	setifcap),
+	DEF_CMD("-txcsum",	-IFCAP_TXCSUM,	setifcap),
+	DEF_CMD("netcons",	IFCAP_NETCONS,	setifcap),
+	DEF_CMD("-netcons",	-IFCAP_NETCONS,	setifcap),
+	DEF_CMD("polling",	IFCAP_POLLING,	setifcap),
+	DEF_CMD("-polling",	-IFCAP_POLLING,	setifcap),
+	DEF_CMD("tso",		IFCAP_TSO,	setifcap),
+	DEF_CMD("-tso",		-IFCAP_TSO,	setifcap),
+	DEF_CMD("lro",		IFCAP_LRO,	setifcap),
+	DEF_CMD("-lro",		-IFCAP_LRO,	setifcap),
+	DEF_CMD("wol",		IFCAP_WOL,	setifcap),
+	DEF_CMD("-wol",		-IFCAP_WOL,	setifcap),
+	DEF_CMD("wol_ucast",	IFCAP_WOL_UCAST,	setifcap),
+	DEF_CMD("-wol_ucast",	-IFCAP_WOL_UCAST,	setifcap),
+	DEF_CMD("wol_mcast",	IFCAP_WOL_MCAST,	setifcap),
+	DEF_CMD("-wol_mcast",	-IFCAP_WOL_MCAST,	setifcap),
+	DEF_CMD("wol_magic",	IFCAP_WOL_MAGIC,	setifcap),
+	DEF_CMD("-wol_magic",	-IFCAP_WOL_MAGIC,	setifcap),
+	DEF_CMD("normal",	-IFF_LINK0,	setifflags),
+	DEF_CMD("compress",	IFF_LINK0,	setifflags),
+	DEF_CMD("noicmp",	IFF_LINK1,	setifflags),
+	DEF_CMD_ARG("mtu",			setifmtu),
+	DEF_CMD_ARG("name",			setifname),
+};
+
+static __constructor void
+ifconfig_ctor(void)
+{
+#define	N(a)	(sizeof(a) / sizeof(a[0]))
+	size_t i;
+
+	for (i = 0; i < N(basic_cmds);  i++)
+		cmd_register(&basic_cmds[i]);
+#undef N
+}