Added support for extra ifconfig args to jail ip4.addr & ip6.addr params

This allows for CARP interfaces to be  used in jails e.g.
ip4.addr = "em0|10.10.1.20/32 vhid 1 pass MyPass advskew 100"

Before this change using exec.prestart to configure a CARP address
would result in the wrong MAC being broadcast on startup as jail creates
IP aliases to support ip[4|6].addr before exec.prestart is executed.

PR:		191832
Reviewed by:	jamie
MFC after:	1 week
X-MFC-With:	r269340
Phabric:	D528
Sponsored by:	Multiplay

usr.sbin/jail/command.c

@@ -268,7 +268,7 @@ run_command(struct cfjail *j)
 	pid_t pid;
 	int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout;
 #if defined(INET) || defined(INET6)
-	char *addr;
+	char *addr, *extrap, *p, *val;
 #endif
 
 	static char *cleanenv;
@@ -317,16 +317,30 @@ run_command(struct cfjail *j)
 	switch (comparam) {
 #ifdef INET
 	case IP__IP4_IFADDR:
-		argv = alloca(8 * sizeof(char *));
+		argc = 0;
+		val = alloca(strlen(comstring->s) + 1);
+		strcpy(val, comstring->s);
+		cs = val;
+		extrap = NULL;
+		while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) {
+			if (extrap == NULL) {
+				*p = '\0';
+				extrap = p + 1;
+			}
+			cs = p + 1;
+			argc++;
+		}
+
+		argv = alloca((8 + argc) * sizeof(char *));
 		*(const char **)&argv[0] = _PATH_IFCONFIG;
-		if ((cs = strchr(comstring->s, '|'))) {
-			argv[1] = alloca(cs - comstring->s + 1);
-			strlcpy(argv[1], comstring->s, cs - comstring->s + 1);
+		if ((cs = strchr(val, '|'))) {
+			argv[1] = alloca(cs - val + 1);
+			strlcpy(argv[1], val, cs - val + 1);
 			addr = cs + 1;
 		} else {
 			*(const char **)&argv[1] =
 			    string_param(j->intparams[IP_INTERFACE]);
-			addr = comstring->s;
+			addr = val;
 		}
 		*(const char **)&argv[2] = "inet";
 		if (!(cs = strchr(addr, '/'))) {
@@ -344,6 +358,15 @@ run_command(struct cfjail *j)
 			argv[3] = addr;
 			argc = 4;
 		}
+
+		if (!down) {
+			for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) {
+				size_t len = strlen(cs) + 1;
+				argv[argc] = alloca(len);
+				strlcpy(argv[argc++], cs, len);
+			}
+		}
+
 		*(const char **)&argv[argc] = down ? "-alias" : "alias";
 		argv[argc + 1] = NULL;
 		break;
@@ -351,16 +374,30 @@ run_command(struct cfjail *j)
 
 #ifdef INET6
 	case IP__IP6_IFADDR:
-		argv = alloca(8 * sizeof(char *));
+		argc = 0;
+		val = alloca(strlen(comstring->s) + 1);
+		strcpy(val, comstring->s);
+		cs = val;
+		extrap = NULL;
+		while ((p = strchr(cs, ' ')) != NULL && strlen(p) > 1) {
+			if (extrap == NULL) {
+				*p = '\0';
+				extrap = p + 1;
+			}
+			cs = p + 1;
+			argc++;
+		}
+
+		argv = alloca((8 + argc) * sizeof(char *));
 		*(const char **)&argv[0] = _PATH_IFCONFIG;
-		if ((cs = strchr(comstring->s, '|'))) {
-			argv[1] = alloca(cs - comstring->s + 1);
-			strlcpy(argv[1], comstring->s, cs - comstring->s + 1);
+		if ((cs = strchr(val, '|'))) {
+			argv[1] = alloca(cs - val + 1);
+			strlcpy(argv[1], val, cs - val + 1);
 			addr = cs + 1;
 		} else {
 			*(const char **)&argv[1] =
 			    string_param(j->intparams[IP_INTERFACE]);
-			addr = comstring->s;
+			addr = val;
 		}
 		*(const char **)&argv[2] = "inet6";
 		argv[3] = addr;
@@ -370,6 +407,15 @@ run_command(struct cfjail *j)
 			argc = 6;
 		} else
 			argc = 4;
+
+		if (!down) {
+			for (cs = strtok(extrap, " "); cs; cs = strtok(NULL, " ")) {
+				size_t len = strlen(cs) + 1;
+				argv[argc] = alloca(len);
+				strlcpy(argv[argc++], cs, len);
+			}
+		}
+
 		*(const char **)&argv[argc] = down ? "-alias" : "alias";
 		argv[argc + 1] = NULL;
 		break;	

usr.sbin/jail/config.c

@@ -576,7 +576,9 @@ check_intparams(struct cfjail *j)
 
 	/*
 	 * IP addresses may include an interface to set that address on,
-	 * and a netmask/suffix for that address.
+	 * a netmask/suffix for that address and options for ifconfig.
+	 * These are copied to an internal command parameter and then stripped
+	 * so they won't be passed on to jailparam_set.
 	 */
 	defif = string_param(j->intparams[IP_INTERFACE]) != NULL;
 #ifdef INET
@@ -601,6 +603,10 @@ check_intparams(struct cfjail *j)
 				*cs = '\0';
 				s->len = cs - s->s;
 			}
+			if ((cs = strchr(s->s, ' ')) != NULL) {
+				*cs = '\0';
+				s->len = cs - s->s;
+			}
 		}
 	}
 #endif
@@ -625,6 +631,10 @@ check_intparams(struct cfjail *j)
 				*cs = '\0';
 				s->len = cs - s->s;
 			}
+			if ((cs = strchr(s->s, ' ')) != NULL) {
+				*cs = '\0';
+				s->len = cs - s->s;
+			}
 		}
 	}
 #endif

usr.sbin/jail/jail.8

@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 10, 2014
+.Dd August 4, 2014
 .Dt JAIL 8
 .Os
 .Sh NAME
@@ -687,18 +687,24 @@ jail is created, and will be removed from the interface after the
 jail is removed.
 .It Va ip4.addr
 In addition to the IP addresses that are passed to the kernel, an
-interface and/or a netmask may also be specified, in the form
-.Dq Ar interface Ns | Ns Ar ip-address Ns / Ns Ar netmask .
+interface, netmask and additional paramters (as supported by
+.Xr ifconfig 8 Ns )
+may also be specified, in the form
+.Dq Ar interface Ns | Ns Ar ip-address Ns / Ns Ar netmask param ... .
 If an interface is given before the IP address, an alias for the address
 will be added to that interface, as it is with the
 .Va interface
 parameter.
 If a netmask in either dotted-quad or CIDR form is given
 after an IP address, it will be used when adding the IP alias.
+If additional parameters are specified then they will also be used when
+adding the IP alias.
 .It Va ip6.addr
 In addition to the IP addresses that are passed to the kernel,
-an interface and/or a prefix may also be specified, in the form
-.Dq Ar interface Ns | Ns Ar ip-address Ns / Ns Ar prefix .
+an interface, prefix and additional parameters (as supported by
+.Xr ifconfig 8 Ns )
+may also be specified, in the form
+.Dq Ar interface Ns | Ns Ar ip-address Ns / Ns Ar prefix param ... .
 .It Va vnet.interface
 A network interface to give to a vnet-enabled jail after is it created.
 The interface will automatically be released when the jail is removed.
@@ -1177,6 +1183,7 @@ environment of the first jail.
 .Xr pkill 1 ,
 .Xr ps 1 ,
 .Xr quota 1 ,
+.Xr ifconfig 8 ,
 .Xr jail_set 2 ,
 .Xr devfs 5 ,
 .Xr fdescfs 5 ,