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diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -28,7 +28,7 @@
.\" From: @(#)ifconfig.8 8.3 (Berkeley) 1/5/94
.\" $FreeBSD$
.\"
-.Dd March 6, 2023
+.Dd May 22, 2023
.Dt IFCONFIG 8
.Os
.Sh NAME
@@ -36,6 +36,7 @@
.Nd configure network interface parameters
.Sh SYNOPSIS
.Nm
+.Op Fl j Ar jail
.Op Fl kLmn
.Op Fl f Ar type Ns Cm \&: Ns Ar format
.Ar interface
@@ -49,9 +50,11 @@
.Oc
.Op Ar parameters
.Nm
+.Op Fl j Ar jail
.Ar interface
.Cm destroy
.Nm
+.Op Fl j Ar jail
.Fl a
.Op Fl dkLmuv
.Op Fl f Ar type Ns Cm \&: Ns Ar format
@@ -61,13 +64,16 @@
.Nm
.Fl C
.Nm
+.Op Fl j Ar jail
.Fl g Ar groupname
.Nm
+.Op Fl j Ar jail
.Fl l
.Op Fl du
.Op Fl g Ar groupname
.Op Ar address_family
.Nm
+.Op Fl j Ar jail
.Op Fl dkLmuv
.Op Fl f Ar type Ns Cm \&: Ns Ar format
.Sh DESCRIPTION
@@ -233,6 +239,22 @@
to
.Cm all
selects all interfaces.
+.It Fl j Ar jail
+Perform the actions inside the
+.Ar jail .
+.Pp
+The
+.Cm ifconfig
+will first attach to the
+.Ar jail
+(by jail id or jail name) before performing the effects.
+.Pp
+This allow network interfaces of
+.Ar jail
+to be configured even if the
+.Cm ifconfig
+binary is not available in
+.Ar jail .
.It Fl k
Print keying information for the
.Ar interface ,
diff --git a/sbin/ifconfig/ifconfig.c b/sbin/ifconfig/ifconfig.c
--- a/sbin/ifconfig/ifconfig.c
+++ b/sbin/ifconfig/ifconfig.c
@@ -42,6 +42,9 @@
#include <sys/param.h>
#include <sys/ioctl.h>
+#ifdef JAIL
+#include <sys/jail.h>
+#endif
#include <sys/module.h>
#include <sys/linker.h>
#include <sys/nv.h>
@@ -184,12 +187,12 @@
}
fprintf(stderr,
- "usage: ifconfig [-f type:format] %sinterface address_family\n"
+ "usage: ifconfig [-j jail] [-f type:format] %sinterface address_family\n"
" [address [dest_address]] [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",
+ " ifconfig [-j jail] interface create\n"
+ " ifconfig [-j jail] -a %s[-d] [-m] [-u] [-v] [address_family]\n"
+ " ifconfig [-j jail] -l [-d] [-u] [address_family]\n"
+ " ifconfig [-j jail] %s[-d] [-m] [-u] [-v]\n",
options, options, options);
exit(1);
}
@@ -435,9 +438,11 @@
char options[1024];
struct option *p;
int c;
-
+#ifdef JAIL
+ int jid;
+#endif
/* Parse leading line options */
- strlcpy(options, "G:adf:klmnuv", sizeof(options));
+ strlcpy(options, "G:adf:j:klmnuv", sizeof(options));
for (p = opts; p != NULL; p = p->next)
strlcat(options, p->opt, sizeof(options));
while ((c = getopt(argc, argv, options)) != -1) {
@@ -458,6 +463,19 @@
usage();
args->nogroup = optarg;
break;
+ case 'j':
+#ifdef JAIL
+ if (optarg == NULL)
+ usage();
+ jid = jail_getid(optarg);
+ if (jid == -1)
+ Perror("jail not found");
+ if (jail_attach(jid) != 0)
+ Perror("cannot attach to jail");
+#else
+ Perror("not built with jail support");
+#endif
+ break;
case 'k':
args->printkeys = true;
break;

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