MFp4:

  Bring in updated jail support from bz_jail branch.

This enhances the current jail implementation to permit multiple
addresses per jail. In addtion to IPv4, IPv6 is supported as well.
Due to updated checks it is even possible to have jails without
an IP address at all, which basically gives one a chroot with
restricted process view, no networking,..

SCTP support was updated and supports IPv6 in jails as well.

Cpuset support permits jails to be bound to specific processor
sets after creation.

Jails can have an unrestricted (no duplicate protection, etc.) name
in addition to the hostname. The jail name cannot be changed from
within a jail and is considered to be used for management purposes
or as audit-token in the future.

DDB 'show jails' command was added to aid debugging.

Proper compat support permits 32bit jail binaries to be used on 64bit
systems to manage jails. Also backward compatibility was preserved where
possible: for jail v1 syscalls, as well as with user space management
utilities.

Both jail as well as prison version were updated for the new features.
A gap was intentionally left as the intermediate versions had been
used by various patches floating around the last years.

Bump __FreeBSD_version for the afore mentioned and in kernel changes.

Special thanks to:
- Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches
  and Olivier Houchard (cognet) for initial single-IPv6 patches.
- Jeff Roberson (jeff) and Randall Stewart (rrs) for their
  help, ideas and review on cpuset and SCTP support.
- Robert Watson (rwatson) for lots and lots of help, discussions,
  suggestions and review of most of the patch at various stages.
- John Baldwin (jhb) for his help.
- Simon L. Nielsen (simon) as early adopter testing changes
  on cluster machines as well as all the testers and people
  who provided feedback the last months on freebsd-jail and
  other channels.
- My employer, CK Software GmbH, for the support so I could work on this.

Reviewed by:	(see above)
MFC after:	3 months (this is just so that I get the mail)
X-MFC Before:   7.2-RELEASE if possible

3 files changed, 80 insertions, 1 deletions

diff --git a/sys/compat/freebsd32/freebsd32.h b/sys/compat/freebsd32/freebsd32.h
index 0c77bab..08d6510 100644
--- a/sys/compat/freebsd32/freebsd32.h
+++ b/sys/compat/freebsd32/freebsd32.h
@@ -153,6 +153,24 @@ struct stat32 {
 	unsigned int :(8 / 2) * (16 - (int)sizeof(struct timespec32));
 };
 
+struct jail32_v0 {
+	u_int32_t	version;
+	uint32_t	path;
+	uint32_t	hostname;
+	u_int32_t	ip_number;
+};
+
+struct jail32 {
+	uint32_t	version;
+	uint32_t	path;
+	uint32_t	hostname;
+	uint32_t	jailname;
+	uint32_t	ip4s;
+	uint32_t	ip6s;
+	uint32_t	ip4;
+	uint32_t	ip6;
+};
+
 struct sigaction32 {
 	u_int32_t	sa_u;
 	int		sa_flags;
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index 17ca159..266d063 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/fcntl.h>
 #include <sys/filedesc.h>
 #include <sys/imgact.h>
+#include <sys/jail.h>
 #include <sys/kernel.h>
 #include <sys/limits.h>
 #include <sys/lock.h>
@@ -2036,6 +2037,66 @@ done2:
 }
 
 int
+freebsd32_jail(struct thread *td, struct freebsd32_jail_args *uap)
+{
+	uint32_t version;
+	int error;
+	struct jail j;
+
+	error = copyin(uap->jail, &version, sizeof(uint32_t));
+	if (error)
+		return (error);
+	switch (version) {
+	case 0:	
+	{
+		/* FreeBSD single IPv4 jails. */
+		struct jail32_v0 j32_v0;
+
+		bzero(&j, sizeof(struct jail));
+		error = copyin(uap->jail, &j32_v0, sizeof(struct jail32_v0));
+		if (error)
+			return (error);
+		CP(j32_v0, j, version);
+		PTRIN_CP(j32_v0, j, path);
+		PTRIN_CP(j32_v0, j, hostname);
+		j.ip4s = j32_v0.ip_number;
+		break;
+	}
+
+	case 1:
+		/*
+		 * Version 1 was used by multi-IPv4 jail implementations
+		 * that never made it into the official kernel.
+		 */
+		return (EINVAL);
+
+	case 2:	/* JAIL_API_VERSION */
+	{
+		/* FreeBSD multi-IPv4/IPv6,noIP jails. */
+		struct jail32 j32;
+
+		error = copyin(uap->jail, &j32, sizeof(struct jail32));
+		if (error)
+			return (error);
+		CP(j32, j, version);
+		PTRIN_CP(j32, j, path);
+		PTRIN_CP(j32, j, hostname);
+		PTRIN_CP(j32, j, jailname);
+		CP(j32, j, ip4s);
+		CP(j32, j, ip6s);
+		PTRIN_CP(j32, j, ip4);
+		PTRIN_CP(j32, j, ip6);
+		break;
+	}
+
+	default:
+		/* Sci-Fi jails are not supported, sorry. */
+		return (EINVAL);
+	}
+	return (kern_jail(td, &j));
+}
+
+int
 freebsd32_sigaction(struct thread *td, struct freebsd32_sigaction_args *uap)
 {
 	struct sigaction32 s32;
diff --git a/sys/compat/freebsd32/syscalls.master b/sys/compat/freebsd32/syscalls.master
index dc06557..97aefd2 100644
--- a/sys/compat/freebsd32/syscalls.master
+++ b/sys/compat/freebsd32/syscalls.master
@@ -572,7 +572,7 @@
 				    off_t *sbytes, int flags); }
 337	AUE_NULL	NOPROTO	{ int kldsym(int fileid, int cmd, \
 				    void *data); }
-338	AUE_JAIL	NOPROTO	{ int jail(struct jail *jail); }
+338	AUE_JAIL	STD	{ int freebsd32_jail(struct jail32 *jail); }
 339	AUE_NULL	UNIMPL	pioctl
 340	AUE_SIGPROCMASK	NOPROTO	{ int sigprocmask(int how, \
 				    const sigset_t *set, sigset_t *oset); }