Date: Mon, 08 Dec 2025 17:20:46 +0000 From: Gleb Smirnoff <glebius@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: fbf05d2147b1 - main - linux: separate all ifnet(9) related code into linux_ifnet.c Message-ID: <693708ee.a597.722a351a@gitrepo.freebsd.org>
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The branch main has been updated by glebius: URL: https://cgit.FreeBSD.org/src/commit/?id=fbf05d2147b1add8b760be166c4b1fd4499ebce8 commit fbf05d2147b1add8b760be166c4b1fd4499ebce8 Author: Gleb Smirnoff <glebius@FreeBSD.org> AuthorDate: 2025-12-08 17:20:14 +0000 Commit: Gleb Smirnoff <glebius@FreeBSD.org> CommitDate: 2025-12-08 17:20:14 +0000 linux: separate all ifnet(9) related code into linux_ifnet.c Remove linux_use_real_ifname(). It is no longer used outside of the file since 3ab3c9c29cf0. There is no functional change. Reviewed by: melifaro, dchagin Differential Revision: https://reviews.freebsd.org/D54076 --- sys/compat/linux/linux.c | 278 +--------------------------------- sys/compat/linux/linux.h | 10 -- sys/compat/linux/linux_if.c | 310 ++++++++++++++++++++++++++++++++++++++ sys/modules/linux_common/Makefile | 3 +- 4 files changed, 312 insertions(+), 289 deletions(-) diff --git a/sys/compat/linux/linux.c b/sys/compat/linux/linux.c index a40f110634f7..da2f641bb791 100644 --- a/sys/compat/linux/linux.c +++ b/sys/compat/linux/linux.c @@ -31,6 +31,7 @@ #include <sys/file.h> #include <sys/filedesc.h> #include <sys/jail.h> +#include <sys/limits.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/poll.h> @@ -39,12 +40,7 @@ #include <sys/socket.h> #include <sys/socketvar.h> -#include <net/if.h> -#include <net/if_var.h> -#include <net/if_dl.h> -#include <net/if_types.h> #include <netlink/netlink.h> - #include <sys/un.h> #include <netinet/in.h> @@ -53,17 +49,11 @@ #include <compat/linux/linux_mib.h> #include <compat/linux/linux_util.h> -_Static_assert(LINUX_IFNAMSIZ == IFNAMSIZ, "Linux IFNAMSIZ"); _Static_assert(sizeof(struct sockaddr) == sizeof(struct l_sockaddr), "Linux struct sockaddr size"); _Static_assert(offsetof(struct sockaddr, sa_data) == offsetof(struct l_sockaddr, sa_data), "Linux struct sockaddr layout"); -static bool use_real_ifnames = false; -SYSCTL_BOOL(_compat_linux, OID_AUTO, use_real_ifnames, CTLFLAG_RWTUN, - &use_real_ifnames, 0, - "Use FreeBSD interface names instead of generating ethN aliases"); - static int bsd_to_linux_sigtbl[LINUX_SIGTBLSZ] = { LINUX_SIGHUP, /* SIGHUP */ LINUX_SIGINT, /* SIGINT */ @@ -242,265 +232,6 @@ bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss) } } -/* - * Translate a FreeBSD interface name to a Linux interface name - * by interface name, and return the number of bytes copied to lxname. - */ -int -ifname_bsd_to_linux_name(const char *bsdname, char *lxname, size_t len) -{ - struct epoch_tracker et; - struct ifnet *ifp; - int ret; - - CURVNET_ASSERT_SET(); - - ret = 0; - NET_EPOCH_ENTER(et); - ifp = ifunit(bsdname); - if (ifp != NULL) - ret = ifname_bsd_to_linux_ifp(ifp, lxname, len); - NET_EPOCH_EXIT(et); - return (ret); -} - -/* - * Translate a FreeBSD interface name to a Linux interface name - * by interface index, and return the number of bytes copied to lxname. - */ -int -ifname_bsd_to_linux_idx(u_int idx, char *lxname, size_t len) -{ - struct epoch_tracker et; - struct ifnet *ifp; - int ret; - - ret = 0; - CURVNET_SET(TD_TO_VNET(curthread)); - NET_EPOCH_ENTER(et); - ifp = ifnet_byindex(idx); - if (ifp != NULL) - ret = ifname_bsd_to_linux_ifp(ifp, lxname, len); - NET_EPOCH_EXIT(et); - CURVNET_RESTORE(); - return (ret); -} - -/* - * Translate a FreeBSD interface name to a Linux interface name, - * and return the number of bytes copied to lxname, 0 if interface - * not found, -1 on error. - */ -struct ifname_bsd_to_linux_ifp_cb_s { - struct ifnet *ifp; - int ethno; - char *lxname; - size_t len; -}; - -static int -ifname_bsd_to_linux_ifp_cb(if_t ifp, void *arg) -{ - struct ifname_bsd_to_linux_ifp_cb_s *cbs = arg; - - if (ifp == cbs->ifp) - return (snprintf(cbs->lxname, cbs->len, "eth%d", cbs->ethno)); - if (IFP_IS_ETH(ifp)) - cbs->ethno++; - return (0); -} - -int -ifname_bsd_to_linux_ifp(struct ifnet *ifp, char *lxname, size_t len) -{ - struct ifname_bsd_to_linux_ifp_cb_s arg = { - .ifp = ifp, - .ethno = 0, - .lxname = lxname, - .len = len, - }; - - NET_EPOCH_ASSERT(); - - /* - * Linux loopback interface name is lo (not lo0), - * we translate lo to lo0, loX to loX. - */ - if (IFP_IS_LOOP(ifp) && strncmp(if_name(ifp), "lo0", IFNAMSIZ) == 0) - return (strlcpy(lxname, "lo", len)); - - /* Short-circuit non ethernet interfaces. */ - if (!IFP_IS_ETH(ifp) || linux_use_real_ifname(ifp)) - return (strlcpy(lxname, if_name(ifp), len)); - - /* Determine the (relative) unit number for ethernet interfaces. */ - return (if_foreach(ifname_bsd_to_linux_ifp_cb, &arg)); -} - -/* - * Translate a Linux interface name to a FreeBSD interface name, - * and return the associated ifnet structure - * bsdname and lxname need to be least IFNAMSIZ bytes long, but - * can point to the same buffer. - */ -struct ifname_linux_to_ifp_cb_s { - bool is_lo; - bool is_eth; - int ethno; - int unit; - const char *lxname; - if_t ifp; -}; - -static int -ifname_linux_to_ifp_cb(if_t ifp, void *arg) -{ - struct ifname_linux_to_ifp_cb_s *cbs = arg; - - NET_EPOCH_ASSERT(); - - /* - * Allow Linux programs to use FreeBSD names. Don't presume - * we never have an interface named "eth", so don't make - * the test optional based on is_eth. - */ - if (strncmp(if_name(ifp), cbs->lxname, LINUX_IFNAMSIZ) == 0) - goto out; - if (cbs->is_eth && IFP_IS_ETH(ifp) && cbs->unit == cbs->ethno) - goto out; - if (cbs->is_lo && IFP_IS_LOOP(ifp)) - goto out; - if (IFP_IS_ETH(ifp)) - cbs->ethno++; - return (0); - -out: - cbs->ifp = ifp; - return (1); -} - -struct ifnet * -ifname_linux_to_ifp(struct thread *td, const char *lxname) -{ - struct ifname_linux_to_ifp_cb_s arg = { - .ethno = 0, - .lxname = lxname, - .ifp = NULL, - }; - int len; - char *ep; - - NET_EPOCH_ASSERT(); - - for (len = 0; len < LINUX_IFNAMSIZ; ++len) - if (!isalpha(lxname[len]) || lxname[len] == '\0') - break; - if (len == 0 || len == LINUX_IFNAMSIZ) - return (NULL); - /* - * Linux loopback interface name is lo (not lo0), - * we translate lo to lo0, loX to loX. - */ - arg.is_lo = (len == 2 && strncmp(lxname, "lo", LINUX_IFNAMSIZ) == 0); - arg.unit = (int)strtoul(lxname + len, &ep, 10); - if ((ep == NULL || ep == lxname + len || ep >= lxname + LINUX_IFNAMSIZ) && - arg.is_lo == 0) - return (NULL); - arg.is_eth = (len == 3 && strncmp(lxname, "eth", len) == 0); - - if_foreach(ifname_linux_to_ifp_cb, &arg); - return (arg.ifp); -} - -int -ifname_linux_to_bsd(struct thread *td, const char *lxname, char *bsdname) -{ - struct epoch_tracker et; - struct ifnet *ifp; - - CURVNET_SET(TD_TO_VNET(td)); - NET_EPOCH_ENTER(et); - ifp = ifname_linux_to_ifp(td, lxname); - if (ifp != NULL && bsdname != NULL) - strlcpy(bsdname, if_name(ifp), IFNAMSIZ); - NET_EPOCH_EXIT(et); - CURVNET_RESTORE(); - return (ifp != NULL ? 0 : EINVAL); -} - -unsigned short -linux_ifflags(struct ifnet *ifp) -{ - unsigned short flags; - - NET_EPOCH_ASSERT(); - - flags = if_getflags(ifp) | if_getdrvflags(ifp); - return (bsd_to_linux_ifflags(flags)); -} - -unsigned short -bsd_to_linux_ifflags(int fl) -{ - unsigned short flags = 0; - - if (fl & IFF_UP) - flags |= LINUX_IFF_UP; - if (fl & IFF_BROADCAST) - flags |= LINUX_IFF_BROADCAST; - if (fl & IFF_DEBUG) - flags |= LINUX_IFF_DEBUG; - if (fl & IFF_LOOPBACK) - flags |= LINUX_IFF_LOOPBACK; - if (fl & IFF_POINTOPOINT) - flags |= LINUX_IFF_POINTOPOINT; - if (fl & IFF_DRV_RUNNING) - flags |= LINUX_IFF_RUNNING; - if (fl & IFF_NOARP) - flags |= LINUX_IFF_NOARP; - if (fl & IFF_PROMISC) - flags |= LINUX_IFF_PROMISC; - if (fl & IFF_ALLMULTI) - flags |= LINUX_IFF_ALLMULTI; - if (fl & IFF_MULTICAST) - flags |= LINUX_IFF_MULTICAST; - return (flags); -} - -static u_int -linux_ifhwaddr_cb(void *arg, struct ifaddr *ifa, u_int count) -{ - struct sockaddr_dl *sdl = (struct sockaddr_dl *)ifa->ifa_addr; - struct l_sockaddr *lsa = arg; - - if (count > 0) - return (0); - if (sdl->sdl_type != IFT_ETHER) - return (0); - bzero(lsa, sizeof(*lsa)); - lsa->sa_family = LINUX_ARPHRD_ETHER; - bcopy(LLADDR(sdl), lsa->sa_data, LINUX_IFHWADDRLEN); - return (1); -} - -int -linux_ifhwaddr(struct ifnet *ifp, struct l_sockaddr *lsa) -{ - - NET_EPOCH_ASSERT(); - - if (IFP_IS_LOOP(ifp)) { - bzero(lsa, sizeof(*lsa)); - lsa->sa_family = LINUX_ARPHRD_LOOPBACK; - return (0); - } - if (!IFP_IS_ETH(ifp)) - return (ENOENT); - if (if_foreach_addr_type(ifp, AF_LINK, linux_ifhwaddr_cb, lsa) > 0) - return (0); - return (ENOENT); -} - sa_family_t linux_to_bsd_domain(sa_family_t domain) { @@ -888,10 +619,3 @@ bsd_to_linux_poll_events(short bev, short *lev) *lev = bits; } - -bool -linux_use_real_ifname(const struct ifnet *ifp) -{ - - return (use_real_ifnames); -} diff --git a/sys/compat/linux/linux.h b/sys/compat/linux/linux.h index 6d276b8a69f4..625aee2be127 100644 --- a/sys/compat/linux/linux.h +++ b/sys/compat/linux/linux.h @@ -359,16 +359,6 @@ struct l_statx { ktrstruct("l_sigset_t", (s), l) #endif -/* - * Criteria for interface name translation - */ -#define IFP_IS_ETH(ifp) (if_gettype(ifp) == IFT_ETHER) -#define IFP_IS_LOOP(ifp) (if_gettype(ifp) == IFT_LOOP) - -struct ifnet; - -bool linux_use_real_ifname(const struct ifnet *); - void linux_netlink_register(void); void linux_netlink_deregister(void); diff --git a/sys/compat/linux/linux_if.c b/sys/compat/linux/linux_if.c new file mode 100644 index 000000000000..29e86d71aa5a --- /dev/null +++ b/sys/compat/linux/linux_if.c @@ -0,0 +1,310 @@ +/*- + * Copyright (c) 2015 Dmitry Chagin <dchagin@FreeBSD.org> + * + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + */ + +#include <sys/param.h> +#include <sys/ctype.h> +#include <sys/jail.h> +#include <sys/socket.h> +#include <sys/sysctl.h> +#include <net/if.h> +#include <net/if_dl.h> +#include <net/if_types.h> +#include <net/if_var.h> + +#include <compat/linux/linux.h> +#include <compat/linux/linux_common.h> +#include <compat/linux/linux_mib.h> + +_Static_assert(LINUX_IFNAMSIZ == IFNAMSIZ, "Linux IFNAMSIZ"); + +static bool use_real_ifnames = false; +SYSCTL_BOOL(_compat_linux, OID_AUTO, use_real_ifnames, CTLFLAG_RWTUN, + &use_real_ifnames, 0, + "Use FreeBSD interface names instead of generating ethN aliases"); + +/* + * Criteria for interface name translation + */ +#define IFP_IS_ETH(ifp) (if_gettype(ifp) == IFT_ETHER) +#define IFP_IS_LOOP(ifp) (if_gettype(ifp) == IFT_LOOP) + +/* + * Translate a FreeBSD interface name to a Linux interface name + * by interface name, and return the number of bytes copied to lxname. + */ +int +ifname_bsd_to_linux_name(const char *bsdname, char *lxname, size_t len) +{ + struct epoch_tracker et; + struct ifnet *ifp; + int ret; + + CURVNET_ASSERT_SET(); + + ret = 0; + NET_EPOCH_ENTER(et); + ifp = ifunit(bsdname); + if (ifp != NULL) + ret = ifname_bsd_to_linux_ifp(ifp, lxname, len); + NET_EPOCH_EXIT(et); + return (ret); +} + +/* + * Translate a FreeBSD interface name to a Linux interface name + * by interface index, and return the number of bytes copied to lxname. + */ +int +ifname_bsd_to_linux_idx(u_int idx, char *lxname, size_t len) +{ + struct epoch_tracker et; + struct ifnet *ifp; + int ret; + + ret = 0; + CURVNET_SET(TD_TO_VNET(curthread)); + NET_EPOCH_ENTER(et); + ifp = ifnet_byindex(idx); + if (ifp != NULL) + ret = ifname_bsd_to_linux_ifp(ifp, lxname, len); + NET_EPOCH_EXIT(et); + CURVNET_RESTORE(); + return (ret); +} + +/* + * Translate a FreeBSD interface name to a Linux interface name, + * and return the number of bytes copied to lxname, 0 if interface + * not found, -1 on error. + */ +struct ifname_bsd_to_linux_ifp_cb_s { + struct ifnet *ifp; + int ethno; + char *lxname; + size_t len; +}; + +static int +ifname_bsd_to_linux_ifp_cb(if_t ifp, void *arg) +{ + struct ifname_bsd_to_linux_ifp_cb_s *cbs = arg; + + if (ifp == cbs->ifp) + return (snprintf(cbs->lxname, cbs->len, "eth%d", cbs->ethno)); + if (IFP_IS_ETH(ifp)) + cbs->ethno++; + return (0); +} + +int +ifname_bsd_to_linux_ifp(struct ifnet *ifp, char *lxname, size_t len) +{ + struct ifname_bsd_to_linux_ifp_cb_s arg = { + .ifp = ifp, + .ethno = 0, + .lxname = lxname, + .len = len, + }; + + NET_EPOCH_ASSERT(); + + /* + * Linux loopback interface name is lo (not lo0), + * we translate lo to lo0, loX to loX. + */ + if (IFP_IS_LOOP(ifp) && strncmp(if_name(ifp), "lo0", IFNAMSIZ) == 0) + return (strlcpy(lxname, "lo", len)); + + /* Short-circuit non ethernet interfaces. */ + if (!IFP_IS_ETH(ifp) || use_real_ifnames) + return (strlcpy(lxname, if_name(ifp), len)); + + /* Determine the (relative) unit number for ethernet interfaces. */ + return (if_foreach(ifname_bsd_to_linux_ifp_cb, &arg)); +} + +/* + * Translate a Linux interface name to a FreeBSD interface name, + * and return the associated ifnet structure + * bsdname and lxname need to be least IFNAMSIZ bytes long, but + * can point to the same buffer. + */ +struct ifname_linux_to_ifp_cb_s { + bool is_lo; + bool is_eth; + int ethno; + int unit; + const char *lxname; + if_t ifp; +}; + +static int +ifname_linux_to_ifp_cb(if_t ifp, void *arg) +{ + struct ifname_linux_to_ifp_cb_s *cbs = arg; + + NET_EPOCH_ASSERT(); + + /* + * Allow Linux programs to use FreeBSD names. Don't presume + * we never have an interface named "eth", so don't make + * the test optional based on is_eth. + */ + if (strncmp(if_name(ifp), cbs->lxname, LINUX_IFNAMSIZ) == 0) + goto out; + if (cbs->is_eth && IFP_IS_ETH(ifp) && cbs->unit == cbs->ethno) + goto out; + if (cbs->is_lo && IFP_IS_LOOP(ifp)) + goto out; + if (IFP_IS_ETH(ifp)) + cbs->ethno++; + return (0); + +out: + cbs->ifp = ifp; + return (1); +} + +struct ifnet * +ifname_linux_to_ifp(struct thread *td, const char *lxname) +{ + struct ifname_linux_to_ifp_cb_s arg = { + .ethno = 0, + .lxname = lxname, + .ifp = NULL, + }; + int len; + char *ep; + + NET_EPOCH_ASSERT(); + + for (len = 0; len < LINUX_IFNAMSIZ; ++len) + if (!isalpha(lxname[len]) || lxname[len] == '\0') + break; + if (len == 0 || len == LINUX_IFNAMSIZ) + return (NULL); + /* + * Linux loopback interface name is lo (not lo0), + * we translate lo to lo0, loX to loX. + */ + arg.is_lo = (len == 2 && strncmp(lxname, "lo", LINUX_IFNAMSIZ) == 0); + arg.unit = (int)strtoul(lxname + len, &ep, 10); + if ((ep == NULL || ep == lxname + len || ep >= lxname + LINUX_IFNAMSIZ) && + arg.is_lo == 0) + return (NULL); + arg.is_eth = (len == 3 && strncmp(lxname, "eth", len) == 0); + + if_foreach(ifname_linux_to_ifp_cb, &arg); + return (arg.ifp); +} + +int +ifname_linux_to_bsd(struct thread *td, const char *lxname, char *bsdname) +{ + struct epoch_tracker et; + struct ifnet *ifp; + + CURVNET_SET(TD_TO_VNET(td)); + NET_EPOCH_ENTER(et); + ifp = ifname_linux_to_ifp(td, lxname); + if (ifp != NULL && bsdname != NULL) + strlcpy(bsdname, if_name(ifp), IFNAMSIZ); + NET_EPOCH_EXIT(et); + CURVNET_RESTORE(); + return (ifp != NULL ? 0 : EINVAL); +} + +unsigned short +linux_ifflags(struct ifnet *ifp) +{ + unsigned short flags; + + NET_EPOCH_ASSERT(); + + flags = if_getflags(ifp) | if_getdrvflags(ifp); + return (bsd_to_linux_ifflags(flags)); +} + +unsigned short +bsd_to_linux_ifflags(int fl) +{ + unsigned short flags = 0; + + if (fl & IFF_UP) + flags |= LINUX_IFF_UP; + if (fl & IFF_BROADCAST) + flags |= LINUX_IFF_BROADCAST; + if (fl & IFF_DEBUG) + flags |= LINUX_IFF_DEBUG; + if (fl & IFF_LOOPBACK) + flags |= LINUX_IFF_LOOPBACK; + if (fl & IFF_POINTOPOINT) + flags |= LINUX_IFF_POINTOPOINT; + if (fl & IFF_DRV_RUNNING) + flags |= LINUX_IFF_RUNNING; + if (fl & IFF_NOARP) + flags |= LINUX_IFF_NOARP; + if (fl & IFF_PROMISC) + flags |= LINUX_IFF_PROMISC; + if (fl & IFF_ALLMULTI) + flags |= LINUX_IFF_ALLMULTI; + if (fl & IFF_MULTICAST) + flags |= LINUX_IFF_MULTICAST; + return (flags); +} + +static u_int +linux_ifhwaddr_cb(void *arg, struct ifaddr *ifa, u_int count) +{ + struct sockaddr_dl *sdl = (struct sockaddr_dl *)ifa->ifa_addr; + struct l_sockaddr *lsa = arg; + + if (count > 0) + return (0); + if (sdl->sdl_type != IFT_ETHER) + return (0); + bzero(lsa, sizeof(*lsa)); + lsa->sa_family = LINUX_ARPHRD_ETHER; + bcopy(LLADDR(sdl), lsa->sa_data, LINUX_IFHWADDRLEN); + return (1); +} + +int +linux_ifhwaddr(struct ifnet *ifp, struct l_sockaddr *lsa) +{ + + NET_EPOCH_ASSERT(); + + if (IFP_IS_LOOP(ifp)) { + bzero(lsa, sizeof(*lsa)); + lsa->sa_family = LINUX_ARPHRD_LOOPBACK; + return (0); + } + if (!IFP_IS_ETH(ifp)) + return (ENOENT); + if (if_foreach_addr_type(ifp, AF_LINK, linux_ifhwaddr_cb, lsa) > 0) + return (0); + return (ENOENT); +} diff --git a/sys/modules/linux_common/Makefile b/sys/modules/linux_common/Makefile index f9f4c791e9d1..291fc6d25f8c 100644 --- a/sys/modules/linux_common/Makefile +++ b/sys/modules/linux_common/Makefile @@ -5,7 +5,7 @@ KMOD= linux_common SRCS= linux_common.c linux_mib.c linux_mmap.c linux_util.c linux_emul.c \ - linux_dummy.c linux_errno.c linux_netlink.c \ + linux_dummy.c linux_errno.c linux_netlink.c linux_if.c \ linux.c device_if.h vnode_if.h bus_if.h opt_inet6.h opt_inet.h .if ${MACHINE_CPUARCH} == "amd64" @@ -15,7 +15,6 @@ SRCS+= linux_x86.c linux_vdso_selector_x86.c EXPORT_SYMS= EXPORT_SYMS+= linux_get_osname EXPORT_SYMS+= linux_get_osrelease -EXPORT_SYMS+= linux_use_real_ifname .if !defined(KERNBUILDDIR) .warning Building Linuxulator outside of a kernel does not make sense
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