2000-02-03 Roland McGrath <roland@baalperazim.frob.com>

	Complete overhaul of pfinet based on the IPv4 networking code from the
	Linux 2.2.12 kernel sources.  This page describes a single unified set
	of interdependent changes, but there are so many changes that I have
	broken up the log entry into paragraphs based on rough topical
	divisions of the work involved.

	Subset of verbatim Linux 2.2.12 sources imported on a vendor branch.
	* linux-src: New directory, see README for details.
	* README: New file, describes linux-src layout and procedures for
	tracking Linux source updates.

	Light modifications to linux-src files to avoid really bending over
	backwards with the glue macros.  All modifications to files in
	linux-src are conditionalized by #ifdef _HURD_.
	* linux-src/include/linux/net.h [_HURD_] (struct socket): New members
	refcnt and identity; elide members fasync_list, file.
	* linux-src/include/linux/rtnetlink.h [! CONFIG_RTNETLINK]
	(rtnl_shlock, rtnl_shunlock) [! _HURD_]: Conditionalize contents on
	this, making these no-ops #ifdef _HURD_.
	* linux-src/net/core/dev.c [_HURD_] (dev_ioctl): Don't define the
	function, instead #define it to 0.
	* linux-src/net/ipv4/af_inet.c [_HURD_] (inet_ioctl): Likewise.
	* linux-src/net/ipv4/arp.c [_HURD_] (arp_ioctl): Likewise.
	* linux-src/net/ipv4/udp.c [_HURD_] (udp_ioctl): Likewise.
	* linux-src/net/ipv4/tcp.c [_HURD_] (tcp_ioctl): Likewise.
	[_HURD_] (tcp_tiocinq): New function, TIOCINQ code from tcp_ioctl.
	* linux-src/net/ipv4/devinet.c [_HURD_] (devinet_ioctl): Don't define
	the function, instead #define it to 0.
	[_HURD_] (configure_device): New function, cobbled from SIOCSIFADDR
	and SIOCSIFNETMASK code from devinet_ioctl.

	* glue-include/asm, glue-include/linux: New directories.
	These contain glue kludge headers that replace all of the
	Linux <asm/*.h> headers except checksum.h, and several of
	the Linux <linux/*.h> headers (the remainder come from
	linux-src/include/linux and are mostly unmodified).
	* glue-include/asm/atomic.h: New file, glue replacement header.
	* glue-include/asm/bitops.h: New file, glue replacement header.
	* glue-include/asm/byteorder.h: New file, glue replacement header.
	* glue-include/asm/checksum.h: New file, glue replacement header.
	* glue-include/asm/errno.h: New file, glue replacement header.
	* glue-include/asm/hardirq.h: New file, glue replacement header.
	* glue-include/asm/init.h: New file, glue replacement header.
	* glue-include/asm/segment.h: New file, glue replacement header.
	* glue-include/asm/spinlock.h: New file, glue replacement header.
	* glue-include/asm/system.h: New file, glue replacement header.
	* glue-include/asm/types.h: New file, glue replacement header.
	* glue-include/asm/uaccess.h: New file, glue replacement header.
	* glue-include/linux/autoconf.h: New file, glue replacement header.
	* glue-include/linux/binfmts.h: New file, glue replacement header.
	* glue-include/linux/config.h: New file, glue replacement header.
	* glue-include/linux/errno.h: New file, glue replacement header.
	* glue-include/linux/fcntl.h: New file, glue replacement header.
	* glue-include/linux/fs.h: New file, glue replacement header.
	* glue-include/linux/in.h: New file, glue replacement header.
	* glue-include/linux/in6.h: New file, glue replacement header.
	* glue-include/linux/interrupt.h: New file, glue replacement header.
	* glue-include/linux/ioctl.h: New file, glue replacement header.
	* glue-include/linux/ipv6.h: New file, glue replacement header.
	* glue-include/linux/kernel.h: New file, glue replacement header.
	* glue-include/linux/limits.h: New file, glue replacement header.
	* glue-include/linux/major.h: New file, glue replacement header.
	* glue-include/linux/malloc.h: New file, glue replacement header.
	* glue-include/linux/mm.h: New file, glue replacement header.
	* glue-include/linux/param.h: New file, glue replacement header.
	* glue-include/linux/personality.h: New file, glue replacement header.
	* glue-include/linux/poll.h: New file, glue replacement header.
	* glue-include/linux/proc_fs.h: New file, glue replacement header.
	* glue-include/linux/sched.h: New file, glue replacement header.
	* glue-include/linux/slab.h: New file, glue replacement header.
	* glue-include/linux/socket.h: New file, glue replacement header.
	* glue-include/linux/sockios.h: New file, glue replacement header.
	* glue-include/linux/stat.h: New file, glue replacement header.
	* glue-include/linux/string.h: New file, glue replacement header.
	* glue-include/linux/termios.h: New file, glue replacement header.
	* glue-include/linux/time.h: New file, glue replacement header.
	* glue-include/linux/timer.h: New file, glue replacement header.
	* glue-include/linux/timex.h: New file, glue replacement header.
	* glue-include/linux/types.h: New file, glue replacement header.
	* glue-include/linux/un.h: New file, glue replacement header.
	* glue-include/linux/version.h: New file, glue replacement header.
	* glue-include/linux/wait.h: New file, glue replacement header.

	* kmem_cache.c: New file.  Glue code replaces Linux kmem_cache_t et al.
	* stubs.c: New file.  No-op functions and stub variables for a few
	things the Linux networking code needs to link.

	* Makefile (core-srcs, arch-lib-srcs, ethernet-srcs, ipv4-srcs): New
	variables, listing sources used from linux-src subdirectories.
	(LINUXSRCS): Define using those.
	(SRCS): Remove devices.c; add kmem_cache.c, stubs.c.
	(UNUSEDSRC): Variable removed.
	(vpath %.c): Remove vpath for $(srcdir)/linux-inet directory.
	Add vpaths for $(srcdir)/linux-src subdirectories.
	(CPPFLAGS): Add -D_HURD_SYSTYPE defining it to $(asm_syntax) as a
	double-quoted string.  Add -I's for glue-include and linux-src/include.

	* pfinet.h: Include <sys/socket.h>, and not <linux/netdevice.h>.
	(master_device): Remove decl.
	(global_lock, packet_queue_lock): Remove common defns.
	(global_lock, net_bh_lock): Declare them as externs.
	(struct sockaddr): Remove len member, make address member just a
	struct sockaddr rather than a 0-length array.
	(setup_loopback_device, become_task_protid, become_task): Remove decls.
	(ethernet_initialize): Declare it.
	(input_work_thread): Remove decl.
	(net_bh_thread): Declare it.
	(tcp_readable): Remove decl.
	(tcp_tiocinq): Declare it.

	* config.h: Rewritten based on Linux 2.2.12 set of CONFIG_* options.
	(CONFIG_NET, CONFIG_INET, CONFIG_SKB_LARGE): These are the only
	Linux config options we set.
	(CONFIG_IP_NOSIOCRT): New macro (not a proper config option, but
	used conveniently in the code).
	* ethernet.c (ethernet_set_multi): Take only one parameter.
	Remove assert, since we always get passed IGMP_ALL_HOSTS.
	(ethernet_thread): Make static.
	(ethernet_demuxer): Use __mutex_lock in place of mutex_lock, so as to
	get cthreads instead of linux/spinlock.h glue macros.  Lock
	net_bh_lock instead of global_lock.  Set SKB->protocol with
	eth_type_trans before calling netif_rx.
	(ethernet_initialize): New function, one-time initialization broken
	out of ethernet_open.
	(ethernet_open): Ports setup moved to ethernet_initialize.
	Don't use `errno' to avoid glue conflicts.
	Use get_privileged_ports here to get the master device port, and
	deallocate it after calling device_open.
	(ethernet_xmit): Use assert_perror.  Only one arg to dev_kfree_skb now.
	(setup_ethernet_device): Change initializations for structure changes.
	Call dev_init_buffers and register_netdevice on the device.
	* timer-emul.c (all functions): Use __mutex_lock instead of mutex_lock.
	Adjust for renaming of `prevp' member to `prev' in struct timer_list.
	(mod_timer): New function.
	* socket.c (proto_ops): Variable removed.
	(net_families): New variable replaces it.
	(sock_register): Rewritten for new calling convention, set
	net_families rather than proto_ops.
	(make_sock_user, clean_socketport, sock_alloc, sock_release):
	Functions moved here from misc.c.
	* sched.c (packet_queue_lock): Variable removed.
	(net_bh_lock, net_bh_wakeup): New variables.
	(current): Variable removed (now a macro in the glue headers).
	(interruptible_sleep_on, wake_up_interruptible): Functions removed.
	They are replaced by inlines in the glue headers.
	(become_task, become_task_protid): Functions removed; they are
	replaced by macros in glue-include/linux/sched.h.
	(net_bh_worker): New function.
	* loopback.c: Completely rewritten, mostly copied from linux-2.2.12's
	drivers/net/loopback.c source file.

	* io-ops.c (all functions): Use __mutex_lock in place of mutex_lock.
	(S_io_write): Call ops->sendmsg instead of ops->write,
	which no longer exists.  If O_NONBLOCK is set, set MSG_DONTWAIT in
	msg_flags.
	(S_io_read): Call ops->recvmsg instead of ops->read,
	which no longer exists  If O_NONBLOCK is set, pass MSG_DONTWAIT.
	(S_io_readable): Use USER->sock->data in place of USER->sock->sk.
	For SOCK_STREAM and SOCK_SEQPACKET types, call tcp_tiocinq.
	(S_io_set_all_openmodes, S_io_get_openmodes, S_io_set_some_openmodes,
	S_io_clear_some_openmodes): Member USER->sock->userflags is now
	renamed USER->sock->flags.
	(S_io_select): Completely rewritten using ops->poll.
	(select_wait): Function removed.
	(S_io_stat): Set st_mode to reflect S_IFSOCK.
	* socket-ops.c (all functions): Use __mutex_lock instead of mutex_lock.
	(S_socket_create): Don't set SOCK->ops or call SOCK->ops->create.
	Instead, call net_families[PF_INET]->create.
	(S_socket_listen): Remove extra checks; just call ops->listen.
	(S_socket_accept): Remove extra checks before ops->accept call.
	Avoid use of goto.
	(S_socket_connect): Remove extra checks; just call ops->connect.
	(S_socket_bind): Adjust for struct sock_addr changes.
	(S_socket_create_address): Likewise.
	(S_socket_whatis_address): Likewise.
	(S_socket_connect2): Don't diddle data structures after
	ops->socketpair call.
	(S_socket_getopt): Use sock_getsockopt if LEVEL is SOL_SOCKET.
	Accept any data size, not just sizeof (int).
	(S_socket_setopt): Use sock_setsockopt if LEVEL is SOL_SOCKET.
	(S_socket_send): Always use ops->sendmsg instead of ops->send or
	ops->sendto, which no longer exist.  If O_NONBLOCK is set, set
	MSG_DONTWAIT in msg_flags.
	(S_socket_recv): Always use ops->recvmsg instead of ops->recv, which
	no longer exists.  If O_NONBLOCK is set, set MSG_DONTWAIT in flags.
	Check for error from S_socket_create_address.

	* main.c (find_device): Don't try to set ether_dev.pa_mask (it's gone).
	(main): Don't call init_devices.  Call ethernet_initialize.
	Start net_bh_worker instead of input_work_thread.  Don't call
	setup_loopback_device.  Instead, take global_lock, do prepare_current,
	and then call sk_init, skb_init, inet_proto_init, and net_dev_init.
	Keep global_lock held while calling argp_parse.
	Call arrange_shutdown_notification only after all that.
	Fix error call for "contacting parent" to pass ERR instead of errno.
	* options.c (ADDR): #undef before defining macro.
	(parse_opt): #if 0 out EDESTADDRREQ check (I don't understand it).
	To apply settings, call configure_devices.
	(ADD_ADDR_OPT): #if 0 --address and --netmask options.  Needs fixed.
	* misc.c (make_sock_user, clean_socketport, sock_alloc, sock_release):
	Functions moved to socket.c.
	(sock_release_peer): Function removed.
	(make_sockaddr_port): Use struct sockaddr_storage to size buffer.
	Fix size calculation for new struct sock_addr layout.
	Initialize sa_family and sa_len of new struct sock_addr.

	Remove the old Linux (2.0.??) network stack and the glue code for it.
	* linux-inet, asm, linux: Directories and all files removed.
	Some of the new files in glue-include came from the old glue headers
	in the asm and linux directories, but most were substantially modified.
	* devices.c: File removed.  The equivalent glue is now elsewhere.

46 files changed, 1087 insertions, 0 deletions

diff --git a/pfinet/glue-include/asm/atomic.h b/pfinet/glue-include/asm/atomic.h
new file mode 100644
index 00000000..d053854e
--- /dev/null
+++ b/pfinet/glue-include/asm/atomic.h
@@ -0,0 +1,27 @@
+#ifndef _HACK_ASM_ATOMIC_H
+#define _HACK_ASM_ATOMIC_H
+
+/* We don't need atomicity in the Linux code because we serialize all
+   entries to it.  */
+
+typedef struct { int counter; } atomic_t;
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)		((v)->counter)
+#define atomic_set(v,i)		(((v)->counter) = (i))
+
+static __inline__ void atomic_add(int i, atomic_t *v)	{ v->counter += i; }
+static __inline__ void atomic_sub(int i, atomic_t *v)	{ v->counter -= i; }
+static __inline__ void atomic_inc(atomic_t *v)		{ ++v->counter; }
+static __inline__ void atomic_dec(atomic_t *v)		{ --v->counter; }
+static __inline__ int atomic_dec_and_test(atomic_t *v)
+{ return --v->counter == 0; }
+static __inline__ int atomic_inc_and_test_greater_zero(atomic_t *v)
+{ return ++v->counter > 0; }
+
+#define atomic_clear_mask(mask, addr)			(*(addr) &= ~(mask))
+#define atomic_set_mask(mask, addr)			(*(addr) |= (mask))
+
+
+#endif
diff --git a/pfinet/glue-include/asm/bitops.h b/pfinet/glue-include/asm/bitops.h
new file mode 100644
index 00000000..8c5a835d
--- /dev/null
+++ b/pfinet/glue-include/asm/bitops.h
@@ -0,0 +1,37 @@
+#ifndef _HACK_ASM_BITOPS_H
+#define _HACK_ASM_BITOPS_H
+
+/* We don't need atomicity in the Linux code because we serialize all
+   entries to it.  */
+
+#include <stdint.h>
+
+#define BITOPS_WORD(nr, addr)	(((uint32_t *) (addr))[(nr) / 32])
+#define BITOPS_MASK(nr)		(1 << ((nr) & 31))
+
+static __inline__ void set_bit (int nr, void *addr)
+{ BITOPS_WORD (nr, addr) |= BITOPS_MASK (nr); }
+
+static __inline__ void clear_bit (int nr, void *addr)
+{ BITOPS_WORD (nr, addr) &= ~BITOPS_MASK (nr); }
+
+static __inline__ void change_bit (int nr, void *addr)
+{ BITOPS_WORD (nr, addr) ^= BITOPS_MASK (nr); }
+
+static __inline__ int test_bit (int nr, void *addr)
+{ return BITOPS_WORD (nr, addr) & BITOPS_MASK (nr); }
+
+static __inline__ int test_and_set_bit (int nr, void *addr)
+{
+  int res = BITOPS_WORD (nr, addr) & BITOPS_MASK (nr);
+  BITOPS_WORD (nr, addr) |= BITOPS_MASK (nr);
+  return res;
+}
+
+#define find_first_zero_bit #error loser
+#define find_next_zero_bit #error loser
+
+#define ffz(word)	(ffs (~(unsigned int) (word)) - 1)
+
+
+#endif
diff --git a/pfinet/glue-include/asm/byteorder.h b/pfinet/glue-include/asm/byteorder.h
new file mode 100644
index 00000000..ee1da1f4
--- /dev/null
+++ b/pfinet/glue-include/asm/byteorder.h
@@ -0,0 +1,154 @@
+/* Provide the specified-byte-order access functions used in the Linux
+   kernel, implemented as macros in terms of the GNU libc facilities.  */
+
+#ifndef _HACK_ASM_BYTEORDER_H
+#define _HACK_ASM_BYTEORDER_H 1
+
+#include <endian.h>
+#include <byteswap.h>
+
+#define BO_cvt(bits, from, to, x) \
+  ((from) == (to) ? (u_int##bits##_t) (x) : bswap_##bits (x))
+#define BO_cvtp(bits, from, to, p) \
+  BO_cvt (bits, from, to, *(const u_int##bits##_t *) (p))
+#define BO_cvts(bits, from, to, p) \
+  ({ const u_int##bits##_t *_p = (p); *_p = BO_cvt (bits, from, to, *_p); })
+
+#define	__cpu_to_le64(x)	BO_cvt (64, BYTE_ORDER, LITTLE_ENDIAN,	(x))
+#define	__le64_to_cpu(x)	BO_cvt (64, LITTLE_ENDIAN, BYTE_ORDER,	(x))
+#define	__cpu_to_le32(x)	BO_cvt (32, BYTE_ORDER, LITTLE_ENDIAN,	(x))
+#define	__le32_to_cpu(x)	BO_cvt (32, LITTLE_ENDIAN, BYTE_ORDER,	(x))
+#define	__cpu_to_le16(x)	BO_cvt (16, BYTE_ORDER, LITTLE_ENDIAN,	(x))
+#define	__le16_to_cpu(x)	BO_cvt (16, LITTLE_ENDIAN, BYTE_ORDER,	(x))
+#define	__cpu_to_be64(x)	BO_cvt (64, BYTE_ORDER, BIG_ENDIAN,	(x))
+#define	__be64_to_cpu(x)	BO_cvt (64, BIG_ENDIAN, BYTE_ORDER,	(x))
+#define	__cpu_to_be32(x)	BO_cvt (32, BYTE_ORDER, BIG_ENDIAN,	(x))
+#define	__be32_to_cpu(x)	BO_cvt (32, BIG_ENDIAN, BYTE_ORDER,	(x))
+#define	__cpu_to_be16(x)	BO_cvt (16, BYTE_ORDER, BIG_ENDIAN,	(x))
+#define	__be16_to_cpu(x)	BO_cvt (16, BIG_ENDIAN, BYTE_ORDER,	(x))
+#define	__cpu_to_le64p(p)	BO_cvtp (64, BYTE_ORDER, LITTLE_ENDIAN,	(p))
+#define	__le64_to_cpup(p)	BO_cvtp (64, LITTLE_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_le32p(p)	BO_cvtp (32, BYTE_ORDER, LITTLE_ENDIAN,	(p))
+#define	__le32_to_cpup(p)	BO_cvtp (32, LITTLE_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_le16p(p)	BO_cvtp (16, BYTE_ORDER, LITTLE_ENDIAN,	(p))
+#define	__le16_to_cpup(p)	BO_cvtp (16, LITTLE_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_be64p(p)	BO_cvtp (64, BYTE_ORDER, BIG_ENDIAN,	(p))
+#define	__be64_to_cpup(p)	BO_cvtp (64, BIG_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_be32p(p)	BO_cvtp (32, BYTE_ORDER, BIG_ENDIAN,	(p))
+#define	__be32_to_cpup(p)	BO_cvtp (32, BIG_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_be16p(p)	BO_cvtp (16, BYTE_ORDER, BIG_ENDIAN,	(p))
+#define	__be16_to_cpup(p)	BO_cvtp (16, BIG_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_le64s(p)	BO_cvts (64, BYTE_ORDER, LITTLE_ENDIAN,	(p))
+#define	__le64_to_cpus(p)	BO_cvts (64, LITTLE_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_le32s(p)	BO_cvts (32, BYTE_ORDER, LITTLE_ENDIAN,	(p))
+#define	__le32_to_cpus(p)	BO_cvts (32, LITTLE_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_le16s(p)	BO_cvts (16, BYTE_ORDER, LITTLE_ENDIAN,	(p))
+#define	__le16_to_cpus(p)	BO_cvts (16, LITTLE_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_be64s(p)	BO_cvts (64, BYTE_ORDER, BIG_ENDIAN,	(p))
+#define	__be64_to_cpus(p)	BO_cvts (64, BIG_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_be32s(p)	BO_cvts (32, BYTE_ORDER, BIG_ENDIAN,	(p))
+#define	__be32_to_cpus(p)	BO_cvts (32, BIG_ENDIAN, BYTE_ORDER,	(p))
+#define	__cpu_to_be16s(p)	BO_cvts (16, BYTE_ORDER, BIG_ENDIAN,	(p))
+#define	__be16_to_cpus(p)	BO_cvts (16, BIG_ENDIAN, BYTE_ORDER,	(p))
+
+#define cpu_to_le64 __cpu_to_le64
+#define le64_to_cpu __le64_to_cpu
+#define cpu_to_le32 __cpu_to_le32
+#define le32_to_cpu __le32_to_cpu
+#define cpu_to_le16 __cpu_to_le16
+#define le16_to_cpu __le16_to_cpu
+#define cpu_to_be64 __cpu_to_be64
+#define be64_to_cpu __be64_to_cpu
+#define cpu_to_be32 __cpu_to_be32
+#define be32_to_cpu __be32_to_cpu
+#define cpu_to_be16 __cpu_to_be16
+#define be16_to_cpu __be16_to_cpu
+#define cpu_to_le64p __cpu_to_le64p
+#define le64_to_cpup __le64_to_cpup
+#define cpu_to_le32p __cpu_to_le32p
+#define le32_to_cpup __le32_to_cpup
+#define cpu_to_le16p __cpu_to_le16p
+#define le16_to_cpup __le16_to_cpup
+#define cpu_to_be64p __cpu_to_be64p
+#define be64_to_cpup __be64_to_cpup
+#define cpu_to_be32p __cpu_to_be32p
+#define be32_to_cpup __be32_to_cpup
+#define cpu_to_be16p __cpu_to_be16p
+#define be16_to_cpup __be16_to_cpup
+#define cpu_to_le64s __cpu_to_le64s
+#define le64_to_cpus __le64_to_cpus
+#define cpu_to_le32s __cpu_to_le32s
+#define le32_to_cpus __le32_to_cpus
+#define cpu_to_le16s __cpu_to_le16s
+#define le16_to_cpus __le16_to_cpus
+#define cpu_to_be64s __cpu_to_be64s
+#define be64_to_cpus __be64_to_cpus
+#define cpu_to_be32s __cpu_to_be32s
+#define be32_to_cpus __be32_to_cpus
+#define cpu_to_be16s __cpu_to_be16s
+#define be16_to_cpus __be16_to_cpus
+
+
+#if BYTE_ORDER == BIG_ENDIAN
+# define __BIG_ENDIAN_BITFIELD
+#elif BYTE_ORDER == LITTLE_ENDIAN
+# define __LITTLE_ENDIAN_BITFIELD
+#else
+# error __FOO_ENDIAN_BITFIELD
+#endif
+
+
+#include <netinet/in.h>		/* for htonl et al */
+
+/* Though the optimized macros defined by glibc do the constant magic,
+   there are places in the Linux code that use these in constant-only
+   places like initializers, and the ({...}) expressions the macros use are
+   not valid in those contexts.  */
+#if BYTE_ORDER == BIG_ENDIAN
+#	if !defined(__constant_htonl)
+#		define __constant_htonl(x) (x)
+#	endif
+#	if !defined(__constant_htons)
+#		define __constant_htons(x) (x)
+#	endif
+#elif BYTE_ORDER == LITTLE_ENDIAN
+#	if !defined(__constant_htonl)
+#		define __constant_htonl(x) \
+        ((unsigned long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
+                             (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
+                             (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
+                             (((unsigned long int)(x) & 0xff000000U) >> 24)))
+#	endif
+#	if !defined(__constant_htons)
+#		define __constant_htons(x) \
+        ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
+                              (((unsigned short int)(x) & 0xff00) >> 8)))
+#	endif
+#else
+#	error "Don't know if bytes are big- or little-endian!"
+#endif
+
+/* The transformation is the same in both directions.  */
+#define	__constant_ntohl	__constant_htonl
+#define	__constant_ntohs	__constant_htons
+
+
+/* Some Linux code (e.g. <net/tcp.h>) uses #ifdef __BIG_ENDIAN et al.
+   This is not real wonderful with the glibc definitions, where
+   __BIG_ENDIAN et al are always defined (as values for __BYTE_ORDER).  */
+#if BYTE_ORDER == BIG_ENDIAN
+#undef	__LITTLE_ENDIAN
+#elif BYTE_ORDER == LITTLE_ENDIAN
+#undef	__BIG_ENDIAN
+#endif
+#undef	__PDP_ENDIAN
+
+/* Since we've now broken anything that does glibc-style tests,
+   make sure they break loudly rather than silently.  Any headers
+   that need __BYTE_ORDER will just have to be included before
+   we diddle with __BIG_ENDIAN or __LITTLE_ENDIAN above.  */
+#undef	__BYTE_ORDER
+#define	__BYTE_ORDER    ?????crash?????
+
+
+#endif /* asm/byteorder.h */
diff --git a/pfinet/glue-include/asm/checksum.h b/pfinet/glue-include/asm/checksum.h
new file mode 100644
index 00000000..5bcf7551
--- /dev/null
+++ b/pfinet/glue-include/asm/checksum.h
@@ -0,0 +1,5 @@
+/* This is the only file from the Linux include/asm-* directory
+   that we use, so we use this magic file here rather than making a
+   symlink asm -> .../linux-src/include/asm-SYSTYPE somewhere.  */
+
+#include "../../linux-src/include/asm-" _HURD_SYSTYPE "/checksum.h"
diff --git a/pfinet/glue-include/asm/errno.h b/pfinet/glue-include/asm/errno.h
new file mode 100644
index 00000000..7afb6fdc
--- /dev/null
+++ b/pfinet/glue-include/asm/errno.h
@@ -0,0 +1,3 @@
+/* This is used only by checksum.S; the C code uses <linux/errno.h>.  */
+
+#define EFAULT 42		/* only used in unreached code */
diff --git a/pfinet/glue-include/asm/hardirq.h b/pfinet/glue-include/asm/hardirq.h
new file mode 100644
index 00000000..c73d7dcb
--- /dev/null
+++ b/pfinet/glue-include/asm/hardirq.h
@@ -0,0 +1 @@
+#include <linux/interrupt.h>
diff --git a/pfinet/glue-include/asm/init.h b/pfinet/glue-include/asm/init.h
new file mode 100644
index 00000000..2331be7c
--- /dev/null
+++ b/pfinet/glue-include/asm/init.h
@@ -0,0 +1,3 @@
+#define __init
+#define __initdata
+#define __initfunc(x) x
diff --git a/pfinet/glue-include/asm/segment.h b/pfinet/glue-include/asm/segment.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/asm/segment.h
diff --git a/pfinet/glue-include/asm/spinlock.h b/pfinet/glue-include/asm/spinlock.h
new file mode 100644
index 00000000..937c5d05
--- /dev/null
+++ b/pfinet/glue-include/asm/spinlock.h
@@ -0,0 +1,75 @@
+#ifndef _HACK_ASM_SPINLOCK_H_
+#define _HACK_ASM_SPINLOCK_H_
+
+#include <cthreads.h>
+
+typedef struct { } spinlock_t;
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { }
+
+#undef	spin_lock_init
+#undef	spin_lock
+#undef	spin_unlock
+
+#define spin_lock_init(lock)	((void) (lock))
+#define spin_lock(lock)		((void) (lock))
+#define spin_trylock(lock)	((void) (lock), 1)
+#define spin_unlock_wait(lock)	((void) (lock))
+#define spin_unlock(lock)	((void) (lock))
+#define spin_lock_irq(lock)	((void) (lock))
+#define spin_unlock_irq(lock)	((void) (lock))
+#define spin_lock_irqsave(lock, flags)		((void) (lock), (void) (flags))
+#define spin_unlock_irqrestore(lock, flags)	((void) (lock), (void) (flags))
+
+typedef struct { } rwlock_t;
+#define read_lock(rw)		do { } while(0)
+#define write_lock(rw)		do { } while(0)
+#define write_unlock(rw)	do { } while(0)
+#define read_unlock(rw)		do { } while(0)
+
+#if 0
+#include <rwlock.h>
+
+typedef struct mutex spinlock_t;
+
+#undef	spin_lock_init
+#undef	spin_lock
+#undef	spin_unlock
+
+#define SPIN_LOCK_UNLOCKED	MUTEX_INITIALIZER
+#define spin_lock_init(lock)	({ __mutex_init (lock); })
+#define spin_lock(lock)		({ __mutex_lock (lock); })
+#define spin_trylock(lock)	({ __mutex_trylock (lock); })
+#define spin_unlock_wait(lock)	({ __mutex_unlock (lock); })
+#define spin_unlock(lock)	({ __mutex_unlock (lock); })
+#define spin_lock_irq(lock)	({ __mutex_lock (lock); })
+#define spin_unlock_irq(lock)	({ __mutex_unlock (lock); })
+
+#define spin_lock_irqsave(lock, flags) \
+	do { flags = 0; __mutex_lock (lock); } while (0)
+#define spin_unlock_irqrestore(lock, flags)	({ __mutex_unlock (lock); })
+
+
+typedef struct rwlock rwlock_t;
+
+#define read_lock(rw)		rwlock_reader_lock(rw)
+#define write_lock(rw)		rwlock_writer_lock(rw)
+#define write_unlock(rw)	rwlock_writer_unlock(rw)
+#define read_unlock(rw)		rwlock_reader_unlock(rw)
+
+#endif
+
+
+#define read_lock_irq(lock)	read_lock(lock)
+#define read_unlock_irq(lock)	read_unlock(lock)
+#define write_lock_irq(lock)	write_lock(lock)
+#define write_unlock_irq(lock)	write_unlock(lock)
+
+#define read_lock_irqsave(lock, flags)	\
+	do { (flags) = 0; read_lock(lock); } while (0)
+#define read_unlock_irqrestore(lock, flags) read_unlock(lock)
+#define write_lock_irqsave(lock, flags)	\
+	do { (flags) = 0; write_lock(lock); } while (0)
+#define write_unlock_irqrestore(lock, flags) write_unlock(lock)
+
+
+#endif
diff --git a/pfinet/glue-include/asm/system.h b/pfinet/glue-include/asm/system.h
new file mode 100644
index 00000000..1a5d61cd
--- /dev/null
+++ b/pfinet/glue-include/asm/system.h
@@ -0,0 +1,20 @@
+#ifndef _HACK_ASM_SYSTEM_H
+#define _HACK_ASM_SYSTEM_H
+
+/* We don't need atomicity in the Linux code because we serialize all
+   entries to it.  */
+
+#include <stdint.h>
+
+#define xchg(ptr, x)							      \
+  ({									      \
+    __typeof__ (*(ptr)) *_ptr = (ptr), _x = *_ptr;			      \
+    (uintptr_t) *_ptr = (x); _x;					      \
+  })
+
+#define mb()	((void) 0)	/* memory barrier */
+#define rmb()	mb()
+#define wmb()	mb()
+
+
+#endif
diff --git a/pfinet/glue-include/asm/types.h b/pfinet/glue-include/asm/types.h
new file mode 100644
index 00000000..ee9b980a
--- /dev/null
+++ b/pfinet/glue-include/asm/types.h
@@ -0,0 +1 @@
+#include <linux/types.h>
diff --git a/pfinet/glue-include/asm/uaccess.h b/pfinet/glue-include/asm/uaccess.h
new file mode 100644
index 00000000..d8373797
--- /dev/null
+++ b/pfinet/glue-include/asm/uaccess.h
@@ -0,0 +1,47 @@
+#ifndef _HACK_ASM_UACCESS_H_
+#define _HACK_ASM_UACCESS_H_
+
+#include <linux/mm.h>
+
+
+#define MAKE_MM_SEG(s)	XXX
+#define KERNEL_DS	XXX
+#define USER_DS		XXX
+
+#define get_ds()	XXX
+#define get_fs()	XXX
+#define set_fs(x)	XXX
+
+#define segment_eq(a,b)	XXX
+
+extern int __verify_write(const void *, unsigned long);
+#define __verify_write	XXX
+
+#define __addr_ok(addr)			(1)
+#define __range_ok(addr,size)		(1)
+#define access_ok(type,addr,size) 	(1)
+
+#define put_user(x,ptr) (*(ptr) = (x), 0)
+#define get_user(x,ptr) ((x) = *(ptr), 0)
+
+/*
+ * The "xxx_ret" versions return constant specified in third argument, if
+ * something bad happens. These macros can be optimized for the
+ * case of just returning from the function xxx_ret is used.
+ */
+
+#define put_user_ret(x,ptr,ret) ({ if (put_user(x,ptr)) return ret; })
+
+#define get_user_ret(x,ptr,ret) ({ if (get_user(x,ptr)) return ret; })
+
+
+#define copy_to_user(to,from,n)		(memcpy ((to), (from), (n)), 0)
+#define copy_from_user(to,from,n)	(memcpy ((to), (from), (n)), 0)
+#define	clear_user(mem, len)		(bzero ((mem), (len)), 0)
+
+#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
+
+#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
+
+
+#endif
diff --git a/pfinet/glue-include/linux/autoconf.h b/pfinet/glue-include/linux/autoconf.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/linux/autoconf.h
diff --git a/pfinet/glue-include/linux/binfmts.h b/pfinet/glue-include/linux/binfmts.h
new file mode 100644
index 00000000..c8229dad
--- /dev/null
+++ b/pfinet/glue-include/linux/binfmts.h
@@ -0,0 +1 @@
+#include <linux/capability.h>
diff --git a/pfinet/glue-include/linux/config.h b/pfinet/glue-include/linux/config.h
new file mode 100644
index 00000000..be1e4d3f
--- /dev/null
+++ b/pfinet/glue-include/linux/config.h
@@ -0,0 +1 @@
+#include <linux/errno.h>
diff --git a/pfinet/glue-include/linux/errno.h b/pfinet/glue-include/linux/errno.h
new file mode 100644
index 00000000..7afcd9fd
--- /dev/null
+++ b/pfinet/glue-include/linux/errno.h
@@ -0,0 +1,13 @@
+#ifndef _HACK_ERRNO_H
+#define _HACK_ERRNO_H
+
+#include <errno.h>
+#include <hurd.h>
+
+#define ERESTARTSYS	EINTR
+#define ENOPKG		ENOSYS
+#define ENOIOCTLCMD	ENOTTY
+
+#undef	errno
+
+#endif
diff --git a/pfinet/glue-include/linux/fcntl.h b/pfinet/glue-include/linux/fcntl.h
new file mode 100644
index 00000000..cd304557
--- /dev/null
+++ b/pfinet/glue-include/linux/fcntl.h
@@ -0,0 +1 @@
+#include <fcntl.h>
diff --git a/pfinet/glue-include/linux/fs.h b/pfinet/glue-include/linux/fs.h
new file mode 100644
index 00000000..45dbb19f
--- /dev/null
+++ b/pfinet/glue-include/linux/fs.h
@@ -0,0 +1,21 @@
+#ifndef _HACK_FS_H
+#define _HACK_FS_H
+
+#include <linux/net.h>
+
+/* Hackery */
+struct inode
+{
+  union
+  {
+    int i_garbage;
+    struct socket socket_i;	/* icmp.c actually needs this!! */
+  } u;
+};
+#define i_uid u.i_garbage
+#define i_gid u.i_garbage
+#define i_sock u.i_garbage
+#define i_ino u.i_garbage
+#define i_mode u.i_garbage
+
+#endif
diff --git a/pfinet/glue-include/linux/in.h b/pfinet/glue-include/linux/in.h
new file mode 100644
index 00000000..074c70e3
--- /dev/null
+++ b/pfinet/glue-include/linux/in.h
@@ -0,0 +1,44 @@
+#ifndef	_HACK_IN_H_
+#define _HACK_IN_H_
+
+#include <netinet/in.h>
+
+/* IP_MTU_DISCOVER values */
+#define IP_PMTUDISC_DONT		0	/* Never send DF frames */
+#define IP_PMTUDISC_WANT		1	/* Use per route hints	*/
+#define IP_PMTUDISC_DO			2	/* Always DF		*/
+
+/* These need to appear somewhere around here */
+#define IP_DEFAULT_MULTICAST_TTL        1
+#define IP_DEFAULT_MULTICAST_LOOP       1
+
+struct ip_mreqn
+{
+	struct in_addr	imr_multiaddr;		/* IP multicast address of group */
+	struct in_addr	imr_address;		/* local IP address of interface */
+	int		imr_ifindex;		/* Interface index */
+};
+
+struct in_pktinfo
+{
+	int		ipi_ifindex;
+	struct in_addr	ipi_spec_dst;
+	struct in_addr	ipi_addr;
+};
+
+
+/* <asm/byteorder.h> contains the htonl type stuff.. */
+#include <asm/byteorder.h>
+
+#ifdef __KERNEL__
+/* Some random defines to make it easier in the kernel.. */
+#define LOOPBACK(x)	(((x) & htonl(0xff000000)) == htonl(0x7f000000))
+#define MULTICAST(x)	(((x) & htonl(0xf0000000)) == htonl(0xe0000000))
+#define BADCLASS(x)	(((x) & htonl(0xf0000000)) == htonl(0xf0000000))
+#define ZERONET(x)	(((x) & htonl(0xff000000)) == htonl(0x00000000))
+#define LOCAL_MCAST(x)	(((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))
+
+#endif
+
+
+#endif
diff --git a/pfinet/glue-include/linux/in6.h b/pfinet/glue-include/linux/in6.h
new file mode 100644
index 00000000..260020a6
--- /dev/null
+++ b/pfinet/glue-include/linux/in6.h
@@ -0,0 +1 @@
+#include <netinet/in.h>
diff --git a/pfinet/glue-include/linux/interrupt.h b/pfinet/glue-include/linux/interrupt.h
new file mode 100644
index 00000000..5f485e32
--- /dev/null
+++ b/pfinet/glue-include/linux/interrupt.h
@@ -0,0 +1,44 @@
+#ifndef _HACK_INTERRUPT_H_
+#define _HACK_INTERRUPT_H_
+
+#include <linux/netdevice.h>
+#include "pfinet.h"
+
+#define in_interrupt()		(0)
+#define synchronize_irq()	((void) 0)
+
+#define synchronize_bh()	((void) 0) /* XXX ? */
+
+/* The code that can call these are already entered holding
+   global_lock, which locks out the net_bh worker thread.  */
+#define start_bh_atomic()	((void) 0)
+#define end_bh_atomic()		((void) 0)
+/*
+extern struct mutex net_bh_lock;
+#define start_bh_atomic()	__mutex_lock (&net_bh_lock)
+#define end_bh_atomic()		__mutex_unlock (&net_bh_lock)
+*/
+
+/* See sched.c::net_bh_worker comments.  */
+extern struct condition net_bh_wakeup;
+
+#define NET_BH	0xb00bee51
+
+/* The only call to this ever reached is in net/core/dev.c::netif_rx,
+   to announce having enqueued a packet on `backlog'.  */
+static inline void
+mark_bh (int bh)
+{
+  assert (bh == NET_BH);
+  condition_broadcast (&net_bh_wakeup);
+}
+
+void net_bh (void);
+static inline void
+init_bh (int bh, void (*fn) (void))
+{
+  assert (bh == NET_BH);
+  assert (fn == &net_bh);
+}
+
+#endif
diff --git a/pfinet/glue-include/linux/ioctl.h b/pfinet/glue-include/linux/ioctl.h
new file mode 100644
index 00000000..6ec92cf7
--- /dev/null
+++ b/pfinet/glue-include/linux/ioctl.h
@@ -0,0 +1 @@
+#include <sys/ioctl.h>
diff --git a/pfinet/glue-include/linux/ipv6.h b/pfinet/glue-include/linux/ipv6.h
new file mode 100644
index 00000000..374f9b1e
--- /dev/null
+++ b/pfinet/glue-include/linux/ipv6.h
@@ -0,0 +1 @@
+#include <linux/in6.h>
diff --git a/pfinet/glue-include/linux/kernel.h b/pfinet/glue-include/linux/kernel.h
new file mode 100644
index 00000000..a0e101b9
--- /dev/null
+++ b/pfinet/glue-include/linux/kernel.h
@@ -0,0 +1,78 @@
+#ifndef _HACK_KERNEL_H
+#define _HACK_KERNEL_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+
+/* These don't actually matter since our locking protocols are different.  */
+#define barrier()	((void)0) /*__asm__ __volatile__("": : :"memory") */
+
+#define NORET_TYPE	/**/
+#define ATTRIB_NORET	__attribute__((noreturn))
+#define NORET_AND	noreturn,
+#define FASTCALL(x)	x
+
+/* XXX do something syslogy */
+#define	KERN_EMERG
+#define	KERN_ALERT
+#define	KERN_CRIT
+#define	KERN_ERR
+#define	KERN_WARNING
+#define	KERN_NOTICE
+#define	KERN_INFO
+#define	KERN_DEBUG
+
+#define panic(str...)	(printk (str), assert (!"panic"))
+
+/*
+ *      Display an IP address in readable format.
+ */
+
+#define NIPQUAD(addr) \
+	((unsigned char *)&addr)[0], \
+	((unsigned char *)&addr)[1], \
+	((unsigned char *)&addr)[2], \
+	((unsigned char *)&addr)[3]
+
+
+#include <linux/sched.h>
+#include <linux/bitops.h>
+
+#define printk printf
+
+extern inline int
+getname (const char *name, char **newp)
+{
+  *newp = malloc (strlen (name) + 1);
+  strcpy (*newp, name);
+  return 0;
+}
+
+extern inline void
+putname (char *p)
+{
+  free (p);
+}
+
+/* These two functions are used only to send SIGURG.  But I can't
+   find any SIGIO code at all.  So we'll just punt on that; clearly
+   Linux is missing the point.  SIGURG should only be sent for
+   sockets that have explicitly requested it. */
+extern inline int
+kill_proc (int pid, int signo, int priv)
+{
+  assert (signo == SIGURG);
+  return 0;
+}
+
+extern inline int
+kill_pg (int pgrp, int signo, int priv)
+{
+  assert (signo == SIGURG);
+  return 0;
+}
+
+
+#endif
diff --git a/pfinet/glue-include/linux/limits.h b/pfinet/glue-include/linux/limits.h
new file mode 100644
index 00000000..856c3bde
--- /dev/null
+++ b/pfinet/glue-include/linux/limits.h
@@ -0,0 +1,8 @@
+#ifndef _HACK_LIMITS_H
+#define _HACK_LIMITS_H
+
+#include <limits.h>
+
+#define UIO_MAXIOV	1024	/* probably 1 would do */
+
+#endif
diff --git a/pfinet/glue-include/linux/major.h b/pfinet/glue-include/linux/major.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/linux/major.h
diff --git a/pfinet/glue-include/linux/malloc.h b/pfinet/glue-include/linux/malloc.h
new file mode 100644
index 00000000..46ae1051
--- /dev/null
+++ b/pfinet/glue-include/linux/malloc.h
@@ -0,0 +1,27 @@
+#ifndef _HACK_MALLOC_H_
+#define _HACK_MALLOC_H_
+
+#include <linux/mm.h>
+
+#include <stdlib.h>
+
+static inline void *kmalloc (size_t sz, int ignored) { return malloc (sz); }
+static inline void kfree (void *ptr) { free (ptr); }
+static inline void kfree_s (void *ptr, size_t sz) { free (ptr); }
+#define free(x) kfree(x)	/* just don't ask */
+
+
+typedef struct kmem_cache_s kmem_cache_t;
+
+#define	SLAB_HWCACHE_ALIGN 0	/* flag everybody uses */
+#define SLAB_ATOMIC 0
+
+
+extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
+				       void (*)(void *, kmem_cache_t *, unsigned long),
+				       void (*)(void *, kmem_cache_t *, unsigned long));
+extern void *kmem_cache_alloc(kmem_cache_t *, int);
+extern void kmem_cache_free(kmem_cache_t *, void *);
+
+
+#endif
diff --git a/pfinet/glue-include/linux/mm.h b/pfinet/glue-include/linux/mm.h
new file mode 100644
index 00000000..a6f28e00
--- /dev/null
+++ b/pfinet/glue-include/linux/mm.h
@@ -0,0 +1,18 @@
+#ifndef _HACK_MM_H_
+#define _HACK_MM_H_
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+/* All memory addresses are presumptively valid, because they are
+   all internal. */
+#define verify_area(a,b,c) 0
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 0
+#define GFP_ATOMIC 0
+#define GFP_KERNEL 0
+#define GFP_BUFFER 0
+#define __GFP_WAIT 0
+
+#endif
diff --git a/pfinet/glue-include/linux/param.h b/pfinet/glue-include/linux/param.h
new file mode 100644
index 00000000..39efaf0d
--- /dev/null
+++ b/pfinet/glue-include/linux/param.h
@@ -0,0 +1 @@
+#include <sys/param.h>
diff --git a/pfinet/glue-include/linux/personality.h b/pfinet/glue-include/linux/personality.h
new file mode 100644
index 00000000..9e218435
--- /dev/null
+++ b/pfinet/glue-include/linux/personality.h
@@ -0,0 +1 @@
+#include <linux/linkage.h>
diff --git a/pfinet/glue-include/linux/poll.h b/pfinet/glue-include/linux/poll.h
new file mode 100644
index 00000000..d608abf2
--- /dev/null
+++ b/pfinet/glue-include/linux/poll.h
@@ -0,0 +1,24 @@
+#ifndef _HACK_POLL_H_
+#define _HACK_POLL_H_
+
+#include <hurd/hurd_types.h>
+
+#define	POLLIN		SELECT_READ
+#define	POLLRDNORM	SELECT_READ
+#define POLLOUT		SELECT_WRITE
+#define POLLWRNORM	SELECT_WRITE
+#define POLLWRBAND	SELECT_WRITE
+#define	POLLPRI		SELECT_URG
+#define	POLLERR		0
+#define	POLLHUP		0
+
+typedef struct poll_table_struct { } poll_table;
+
+#include <linux/sched.h>
+
+static inline void
+poll_wait(struct file * filp, struct wait_queue ** wait_address, poll_table *p)
+{
+}
+
+#endif
diff --git a/pfinet/glue-include/linux/proc_fs.h b/pfinet/glue-include/linux/proc_fs.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/linux/proc_fs.h
diff --git a/pfinet/glue-include/linux/sched.h b/pfinet/glue-include/linux/sched.h
new file mode 100644
index 00000000..897a2df0
--- /dev/null
+++ b/pfinet/glue-include/linux/sched.h
@@ -0,0 +1,176 @@
+#ifndef _HACK_SCHED_H
+#define _HACK_SCHED_H
+
+#include <sys/signal.h>
+#include <sys/time.h>
+#include <mach.h>
+#include <hurd/hurd_types.h>
+#include <limits.h>
+#include <assert.h>
+#include <cthreads.h>
+
+#include "mapped-time.h"
+
+#include <linux/binfmts.h>
+#include <linux/personality.h>
+#include <linux/tasks.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/times.h>
+#include <linux/timex.h>
+
+#include <asm/system.h>
+#if 0
+#include <asm/semaphore.h>
+#include <asm/page.h>
+
+#include <linux/smp.h>
+#include <linux/tty.h>
+#include <linux/sem.h>
+#include <linux/signal.h>
+#include <linux/securebits.h>
+#endif
+
+#include <linux/kernel.h>
+#include <linux/net.h>
+#include <linux/wait.h>
+#include <linux/timer.h>
+
+
+#define jiffies (fetch_jiffies ())
+
+#define current	(&current_contents)
+extern struct task_struct current_contents;
+struct task_struct
+{
+  uid_t pgrp, pid;
+  int flags;
+  int timeout;
+  int signal;
+  int blocked;
+  int state, policy;
+  int isroot;
+  char *comm;
+  struct wait_queue **next_wait;
+};
+
+static inline void
+prepare_current (int isroot)
+{
+  current->signal = 0;
+  current->isroot = isroot;
+  /* All other members are constant zero and ignored.  */
+}
+#define become_task(user)		prepare_current ((user)->isroot)
+#define become_task_protid(protid)	prepare_current ((protid)->isroot)
+
+#define signal_pending(current)	((current)->signal)
+
+/* FLAGS in task_struct's. */
+#define PF_EXITING 1
+/* STATE in task_struct's. */
+#define TASK_INTERRUPTIBLE 0
+#define TASK_RUNNING 0
+/* policy in task_struct's. */
+#define SCHED_YIELD 0
+
+struct semaphore { };
+
+
+extern inline int
+suser ()
+{
+  return current->isroot;
+};
+
+extern inline int
+capable(int cap)
+{
+  return current->isroot;
+}
+
+
+extern struct mutex global_lock;
+
+static inline void
+interruptible_sleep_on (struct wait_queue **p)
+{
+  struct condition **condp = (void *) p, *c;
+  int isroot;
+  struct wait_queue **next_wait;
+
+  c = *condp;
+  if (c == 0)
+    {
+      c = malloc (sizeof **condp);
+      assert (c);
+      condition_init (c);
+      *condp = c;
+    }
+
+  isroot = current->isroot;	/* This is our context that needs switched.  */
+  next_wait = current->next_wait; /* This too, for multiple schedule calls.  */
+  current->next_wait = 0;
+  if (hurd_condition_wait (c, &global_lock))
+    current->signal = 1;	/* We got cancelled, mark it for later.  */
+  current->isroot = isroot;	/* Switch back to our context.  */
+  current->next_wait = next_wait;
+}
+#define sleep_on	interruptible_sleep_on
+
+static inline void
+wake_up_interruptible (struct wait_queue **p)
+{
+  struct condition **condp = (void *) p, *c = *condp;
+  if (c)
+    condition_broadcast (c);
+}
+#define wake_up		wake_up_interruptible
+
+
+static inline void
+add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
+{
+  assert (current->next_wait == 0);
+  current->next_wait = p;
+}
+
+static inline void
+remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
+{
+  assert (current->next_wait == p);
+  current->next_wait = 0;
+}
+
+static inline void
+schedule (void)
+{
+  assert (current->next_wait);
+  interruptible_sleep_on (current->next_wait);
+}
+
+static inline long
+schedule_timeout (long timeout)
+{
+  /* XXX this is only ever called to do SO_LINGER, which we don't support */
+  assert (!"schedule_timeout");
+  return 0;
+}
+
+#define	MAX_SCHEDULE_TIMEOUT	LONG_MAX
+
+/* This function is used only to send SIGPIPE to the current
+   task.  In all such cases, EPIPE is returned anyhow.  In the
+   Hurd, servers are not responsible for SIGPIPE; the library
+   does that itself upon receiving EPIPE.  So we can just
+   NOP such calls.  */
+extern inline int
+send_sig (u_long signo, struct task_struct *task, int priv)
+{
+  assert (signo == SIGPIPE);
+  assert (task == current);
+  return 0;
+}
+
+
+#endif
diff --git a/pfinet/glue-include/linux/slab.h b/pfinet/glue-include/linux/slab.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/linux/slab.h
diff --git a/pfinet/glue-include/linux/socket.h b/pfinet/glue-include/linux/socket.h
new file mode 100644
index 00000000..12c73bfa
--- /dev/null
+++ b/pfinet/glue-include/linux/socket.h
@@ -0,0 +1,138 @@
+#ifndef _HACK_SOCKET_H_
+#define _HACK_SOCKET_H_
+
+#include <linux/types.h>
+#include <asm/system.h>
+
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/ioctl.h>
+#include <limits.h>
+
+
+/* #define IP_MAX_MEMBERSHIPS 10 */
+
+#define IPTOS_LOWDELAY 0x10
+#define IPTOS_THROUGHPUT 0x08
+#define IPTOS_RELIABILITY 0x04
+
+#define SOPRI_INTERACTIVE 0
+#define SOPRI_NORMAL 1
+#define SOPRI_BACKGROUND 2
+
+#define SOL_IP IPPROTO_IP
+#define SOL_TCP IPPROTO_TCP
+#define SOL_RAW IPPROTO_RAW
+
+/* IP options */
+#define IP_PKTINFO	190
+#define IP_PKTOPTIONS	191
+#define IP_MTU_DISCOVER	192
+#define IP_RECVERR	193
+#define IP_RECVTTL	194
+#define	IP_RECVTOS	195
+#define IP_MTU		196
+#define IP_ROUTER_ALERT	197
+
+
+/* TCP options */
+#define TCP_NODELAY 1
+#define TCP_MAXSEG 2
+#define TCP_CORK 3
+
+#define SO_NO_CHECK 11
+#define SO_PRIORITY 12
+
+#define	SO_PASSCRED 190
+#define	SO_PEERCRED 191
+#define	SO_BSDCOMPAT 192
+
+/* Maximum queue length specifiable by listen.  */
+#define SOMAXCONN	128
+
+/* XXX */
+#define msg_control	msg_accrights
+#define msg_controllen	msg_accrightslen
+struct cmsghdr { int cmsg_garbage; };
+#define cmsg_len	cmsg_garbage
+#define cmsg_type	cmsg_garbage
+#define cmsg_level	cmsg_garbage
+static inline int
+put_cmsg(struct msghdr *msg, int level, int type, int len, void *data)
+{ return 0; }
+#define CMSG_FIRSTHDR(msg)	(0)
+#define CMSG_NXTHDR(msg, cmsg)	(0)
+#define CMSG_DATA(cmsg)		(0)
+#define CMSG_ALIGN(size)	(0)
+#define CMSG_LEN(size) 		(0)
+
+
+#define MSG_NOSIGNAL	0
+#define MSG_ERRQUEUE	0
+
+/* There is no SOCK_PACKET, it is a bad bad thing.  This chicanery is
+   because the one use of it is a comparison against a `short int' value;
+   using a value outside the range of that type ensures that the comparison
+   will always fail, and in fact it and the dead code will get optimized
+   out entirely at compile time.  */
+#define SOCK_PACKET	((int)((uint32_t)USHRT_MAX) * 2)
+#define PF_PACKET	0
+
+#ifndef UIO_MAXIOV
+#define UIO_MAXIOV 4		/* 1 would do */
+#endif
+
+
+struct ucred {
+  pid_t pid;
+  uid_t uid;
+  gid_t gid;
+};
+
+
+extern inline int
+memcpy_fromiovecend (unsigned char *kdata, struct iovec *iov,
+		     int offset, int len)
+{
+  assert (offset + len <= iov->iov_len);
+  memcpy (kdata, iov->iov_base + offset, len);
+  return 0;
+}
+extern inline int
+memcpy_fromiovec (unsigned char *kdata, struct iovec *iov, int len)
+{
+  assert (len <= iov->iov_len);
+  memcpy (kdata, iov->iov_base, len);
+  return 0;
+}
+extern inline int
+memcpy_toiovec (struct iovec *iov, unsigned char *kdata, int len)
+{
+  assert (len <= iov->iov_len);
+  memcpy (iov->iov_base, kdata, len);
+  return 0;
+}
+extern inline void
+memcpy_tokerneliovec (struct iovec *iov, unsigned char *kdata, int len)
+{
+  assert (len <= iov->iov_len);
+  memcpy (iov->iov_base, kdata, len);
+}
+
+extern int csum_partial_copy_fromiovecend(unsigned char *kdata,
+					  struct iovec *iov,
+					  int offset,
+					  unsigned int len, int *csump);
+
+static inline int move_addr_to_kernel(void *uaddr, int ulen, void *kaddr)
+{
+  abort ();
+  return 0;
+}
+#if 0
+extern int verify_iovec(struct msghdr *m, struct iovec *iov, char *address, int mode);
+extern int move_addr_to_user(void *kaddr, int klen, void *uaddr, int *ulen);
+#endif
+
+
+#endif
diff --git a/pfinet/glue-include/linux/sockios.h b/pfinet/glue-include/linux/sockios.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/linux/sockios.h
diff --git a/pfinet/glue-include/linux/stat.h b/pfinet/glue-include/linux/stat.h
new file mode 100644
index 00000000..5165069b
--- /dev/null
+++ b/pfinet/glue-include/linux/stat.h
@@ -0,0 +1 @@
+#include <sys/stat.h>
diff --git a/pfinet/glue-include/linux/string.h b/pfinet/glue-include/linux/string.h
new file mode 100644
index 00000000..3b2f5900
--- /dev/null
+++ b/pfinet/glue-include/linux/string.h
@@ -0,0 +1 @@
+#include <string.h>
diff --git a/pfinet/glue-include/linux/termios.h b/pfinet/glue-include/linux/termios.h
new file mode 100644
index 00000000..9e269565
--- /dev/null
+++ b/pfinet/glue-include/linux/termios.h
@@ -0,0 +1 @@
+#include <termios.h>
diff --git a/pfinet/glue-include/linux/time.h b/pfinet/glue-include/linux/time.h
new file mode 100644
index 00000000..4973c4ab
--- /dev/null
+++ b/pfinet/glue-include/linux/time.h
@@ -0,0 +1,10 @@
+#ifndef _HACK_TIME_H_
+#define _HACK_TIME_H_
+
+#include <sys/time.h>
+#include "mapped-time.h"
+
+#define do_gettimeofday(tp)	maptime_read (mapped_time, (tp))
+#define get_fast_time(tp)	maptime_read (mapped_time, (tp))
+
+#endif
diff --git a/pfinet/glue-include/linux/timer.h b/pfinet/glue-include/linux/timer.h
new file mode 100644
index 00000000..cc8dec80
--- /dev/null
+++ b/pfinet/glue-include/linux/timer.h
@@ -0,0 +1,36 @@
+#ifndef _HACK_TIMER_H_
+#define _HACK_TIMER_H_
+
+#include <cthreads.h>
+
+enum tstate
+{
+  TIMER_INACTIVE,
+  TIMER_STARTING,
+  TIMER_STARTED,
+  TIMER_EXPIRED,
+  TIMER_FUNCTION_RUNNING,
+};
+
+struct timer_list
+{
+  struct timer_list *next, **prev; /* things like to test "T->prev != NULL" */
+  unsigned long expires;
+  unsigned long data;
+  void (*function)(unsigned long);
+};
+
+void add_timer (struct timer_list *);
+int del_timer (struct timer_list *);
+void mod_timer (struct timer_list *, unsigned long);
+void init_timer (struct timer_list *);
+
+
+#define time_after(a,b)		((long)(b) - (long)(a) < 0)
+#define time_before(a,b)	time_after(b,a)
+
+#define time_after_eq(a,b)	((long)(a) - (long)(b) >= 0)
+#define time_before_eq(a,b)	time_after_eq(b,a)
+
+
+#endif
diff --git a/pfinet/glue-include/linux/timex.h b/pfinet/glue-include/linux/timex.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/linux/timex.h
diff --git a/pfinet/glue-include/linux/types.h b/pfinet/glue-include/linux/types.h
new file mode 100644
index 00000000..604b8b14
--- /dev/null
+++ b/pfinet/glue-include/linux/types.h
@@ -0,0 +1,31 @@
+#ifndef _HACK_TYPES_H
+#define _HACK_TYPES_H
+
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <stdint.h>
+#include <assert.h>
+#include <string.h>
+
+#define	__u8	uint8_t
+#define	__u16	uint16_t
+#define	__u32	uint32_t
+#define	__u64	uint64_t
+#define	__s8	int8_t
+#define	__s16	int16_t
+#define	__s32	int32_t
+#define	__s64	int64_t
+#define	u8	uint8_t
+#define	u16	uint16_t
+#define	u32	uint32_t
+#define	u64	uint64_t
+#define	s8	int8_t
+#define	s16	int16_t
+#define	s32	int32_t
+#define	s64	int64_t
+
+#include <asm/system.h>
+#include <asm/byteorder.h>
+#include <linux/errno.h>
+
+#endif
diff --git a/pfinet/glue-include/linux/un.h b/pfinet/glue-include/linux/un.h
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/pfinet/glue-include/linux/un.h
diff --git a/pfinet/glue-include/linux/version.h b/pfinet/glue-include/linux/version.h
new file mode 100644
index 00000000..3a49a481
--- /dev/null
+++ b/pfinet/glue-include/linux/version.h
@@ -0,0 +1,3 @@
+#define UTS_RELEASE		"2.1.12"
+#define LINUX_VERSION_CODE	KERNEL_VERSION(2,1,12)
+#define KERNEL_VERSION(x,y,z)	(((x)<<16)+((y)<<8)+(z))
diff --git a/pfinet/glue-include/linux/wait.h b/pfinet/glue-include/linux/wait.h
new file mode 100644
index 00000000..7ee962dc
--- /dev/null
+++ b/pfinet/glue-include/linux/wait.h
@@ -0,0 +1,32 @@
+#ifndef _HACK_WAIT_H_
+#define _HACK_WAIT_H_
+
+#include <cthreads.h>
+
+/* This data structure actually represents one waiter on a wait queue,
+   and waiters always expect to initialize it with { current, NULL }.
+   The actual wait queue is a `struct wait_queue *' stored somewhere.
+   We ignore these structures provided by the waiters entirely.
+   In the `struct wait_queue *' that is the "head of the wait queue" slot,
+   we actually store a `struct condition *' pointing to malloc'd storage.  */
+
+struct wait_queue
+{
+  struct task_struct *task;	/* current */
+  struct wait_queue *next;	/* NULL */
+};
+
+
+struct select_table_elt
+{
+  struct condition *dependent_condition;
+  struct select_table_elt *next;
+};
+
+typedef struct select_table_struct
+{
+  struct condition master_condition;
+  struct select_table_elt *head;
+} select_table;
+
+#endif