A bunch of network updates from 2.4.19.

Added the pcap transport, which makes a pcap packet stream look
like a network interface inside UML.
Lifted the limit on the number of network interfaces.
Cleaned up and simplified the transport interface.

arch/um/config_net.in

@@ -9,6 +9,7 @@ dep_bool '  TUN/TAP transport' CONFIG_UML_NET_TUNTAP $CONFIG_UML_NET
 dep_bool '  SLIP transport' CONFIG_UML_NET_SLIP $CONFIG_UML_NET
 dep_bool '  Daemon transport' CONFIG_UML_NET_DAEMON $CONFIG_UML_NET
 dep_bool '  Multicast transport' CONFIG_UML_NET_MCAST $CONFIG_UML_NET
+dep_bool '  pcap transport' CONFIG_UML_NET_PCAP $CONFIG_UML_NET
 
 # Below are hardware-independent drivers mirrored from
 # drivers/net/Config.in. It would be nice if Linux

arch/um/drivers/Makefile

@@ -8,6 +8,7 @@ CHAN_OBJS := chan_kern.o chan_user.o line.o
 slip-objs := slip_kern.o slip_user.o
 daemon-objs := daemon_kern.o daemon_user.o
 mcast-objs := mcast_kern.o mcast_user.o
+pcap-objs := pcap_kern.o pcap_user.o
 net-objs := net_kern.o net_user.o
 mconsole-objs := mconsole_kern.o mconsole_user.o
 hostaudio-objs := hostaudio_kern.o hostaudio_user.o
@@ -22,6 +23,7 @@ obj-$(CONFIG_SSL) += ssl.o
 obj-$(CONFIG_UML_NET_SLIP) += slip.o
 obj-$(CONFIG_UML_NET_DAEMON) += daemon.o 
 obj-$(CONFIG_UML_NET_MCAST) += mcast.o 
+obj-$(CONFIG_UML_NET_PCAP) += pcap.o 
 obj-$(CONFIG_UML_NET) += net.o 
 obj-$(CONFIG_MCONSOLE) += mconsole.o
 obj-$(CONFIG_MMAPPER) += mmapper_kern.o 
@@ -35,6 +37,8 @@ obj-$(CONFIG_TTY_CHAN) += tty.o
 obj-$(CONFIG_XTERM_CHAN) += xterm.o
 obj-$(CONFIG_UML_WATCHDOG) += harddog.o
 
+CFLAGS_pcap_user.o = -I/usr/include/pcap
+
 obj-y += stdio_console.o $(CHAN_OBJS)
 
 USER_SINGLE_OBJS = $(foreach f,$(patsubst %.o,%,$(obj-y) $(obj-m)),$($(f)-objs))

arch/um/drivers/daemon_kern.c

@@ -12,41 +12,36 @@
 #include "net_kern.h"
 #include "net_user.h"
 #include "daemon.h"
-#include "daemon_kern.h"
 
-struct daemon_data daemon_priv[MAX_UML_NETDEV] = {
-	[ 0 ... MAX_UML_NETDEV - 1 ] =
-	{
-		sock_type :	"unix",
-		ctl_sock :	"/tmp/uml.ctl",
-		ctl_addr :	NULL,
-		data_addr :	NULL,
-		local_addr :	NULL,
-		fd :		-1,
-		control :	-1,
-		dev :		NULL,
-	}
+struct daemon_init {
+	char *sock_type;
+	char *ctl_sock;
 };
 
-void daemon_init(struct net_device *dev, int index)
+void daemon_init(struct net_device *dev, void *data)
 {
 	struct uml_net_private *pri;
 	struct daemon_data *dpri;
+	struct daemon_init *init = data;
 
 	init_etherdev(dev, 0);
 	pri = dev->priv;
 	dpri = (struct daemon_data *) pri->user;
-	*dpri = daemon_priv[index];
+	*dpri = ((struct daemon_data)
+		{ sock_type :		init->sock_type,
+		  ctl_sock :		init->ctl_sock,
+		  ctl_addr :		NULL,
+		  data_addr :		NULL,
+		  local_addr :		NULL,
+		  fd :			-1,
+		  control :		-1,
+		  dev :			dev });
+
 	printk("daemon backend (uml_switch version %d) - %s:%s", 
 	       SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
 	printk("\n");
 }
 
-static unsigned short daemon_protocol(struct sk_buff *skb)
-{
-	return(eth_type_trans(skb, skb->dev));
-}
-
 static int daemon_read(int fd, struct sk_buff **skb, 
 		       struct uml_net_private *lp)
 {
@@ -65,47 +60,37 @@ static int daemon_write(int fd, struct sk_buff **skb,
 
 static struct net_kern_info daemon_kern_info = {
 	init:			daemon_init,
-	protocol:		daemon_protocol,
+	protocol:		eth_protocol,
 	read:			daemon_read,
 	write:			daemon_write,
 };
 
-static int daemon_count = 0;
-
-int daemon_setup(char *str, struct uml_net *dev)
+int daemon_setup(char *str, char **mac_out, void *data)
 {
-	int err, n = daemon_count;
+	struct daemon_init *init = data;
+	char *remain;
 
-	dev->user = &daemon_user_info;
-	dev->kern = &daemon_kern_info;
-	dev->private_size = sizeof(struct daemon_data);
-	dev->transport_index = daemon_count++;
-	if(*str != ',') return(0);
-	str++;
- 	if(*str != ','){
- 		err = setup_etheraddr(str, dev->mac);
- 		if(!err) dev->have_mac = 1;
- 	}
-	str = strchr(str, ',');
-	if(str == NULL) return(0);
-	*str++ = '\0';
-	if(*str != ',') daemon_priv[n].sock_type = str;
-	str = strchr(str, ',');
-	if(str == NULL) return(0);
-	*str++ = '\0';
-	if(*str != ',') daemon_priv[n].ctl_sock = str;
-	str = strchr(str, ',');
-	if(str == NULL) return(0);
-	*str = '\0';
-	printk(KERN_WARNING "daemon_setup : Ignoring data socket "
-	       "specification\n");
-	return(0);
+	*init = ((struct daemon_init)
+		{ sock_type :		"unix",
+		  ctl_sock :		"/tmp/uml.ctl" });
+	
+	remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
+			       NULL);
+	if(remain != NULL)
+		printk(KERN_WARNING "daemon_setup : Ignoring data socket "
+		       "specification\n");
+	
+	return(1);
 }
 
 static struct transport daemon_transport = {
-	list :	LIST_HEAD_INIT(daemon_transport.list),
-	name :	"daemon",
-	setup : daemon_setup
+	list :		LIST_HEAD_INIT(daemon_transport.list),
+	name :		"daemon",
+	setup : 	daemon_setup,
+	user :		&daemon_user_info,
+	kern :		&daemon_kern_info,
+	private_size :	sizeof(struct daemon_data),
+	setup_size :	sizeof(struct daemon_init),
 };
 
 static int register_daemon(void)
@@ -115,6 +100,7 @@ static int register_daemon(void)
 }
 
 __initcall(register_daemon);
+
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically

arch/um/drivers/daemon_kern.h

-#ifndef __UM_DAEMON_KERN_H
-#define __UM_DAEMON_KERN_H
-
-#include "net_kern.h"
-
-extern int daemon_setup(char *arg, struct uml_net *dev);
-
-#endif

arch/um/drivers/mcast.h

@@ -10,8 +10,6 @@ struct mcast_data {
 	unsigned short port;
 	void *mcast_addr;
 	int ttl;
-	unsigned char hwaddr[ETH_ADDR_LEN];
-	int hw_setup;
 	void *dev;
 };
 

arch/um/drivers/mcast_kern.c

@@ -19,26 +19,28 @@
 #include "net_kern.h"
 #include "net_user.h"
 #include "mcast.h"
-#include "mcast_kern.h"
-
-struct mcast_data mcast_priv[MAX_UML_NETDEV] = {
-	[ 0 ... MAX_UML_NETDEV - 1 ] =
-	{
-		addr:		"239.192.168.1",
-		port:		1102,
-		ttl:		1,
-	}
+
+struct mcast_init {
+	char *addr;
+	int port;
+	int ttl;
 };
 
-void mcast_init(struct net_device *dev, int index)
+void mcast_init(struct net_device *dev, void *data)
 {
 	struct uml_net_private *pri;
 	struct mcast_data *dpri;
+	struct mcast_init *init = data;
 
 	init_etherdev(dev, 0);
 	pri = dev->priv;
 	dpri = (struct mcast_data *) pri->user;
-	*dpri = mcast_priv[index];
+	*dpri = ((struct mcast_data)
+		{ addr :	init->addr,
+		  port :	init->port,
+		  ttl :		init->ttl,
+		  mcast_addr :	NULL,
+		  dev :		dev });
 	printk("mcast backend ");
 	printk("multicast adddress: %s:%u, TTL:%u ",
 	       dpri->addr, dpri->port, dpri->ttl);
@@ -46,11 +48,6 @@ void mcast_init(struct net_device *dev, int index)
 	printk("\n");
 }
 
-static unsigned short mcast_protocol(struct sk_buff *skb)
-{
-	return eth_type_trans(skb, skb->dev);
-}
-
 static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
 {
 	*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
@@ -68,71 +65,64 @@ static int mcast_write(int fd, struct sk_buff **skb,
 
 static struct net_kern_info mcast_kern_info = {
 	init:			mcast_init,
-	protocol:		mcast_protocol,
+	protocol:		eth_protocol,
 	read:			mcast_read,
 	write:			mcast_write,
 };
 
-static int mcast_count = 0;
-
-int mcast_setup(char *str, struct uml_net *dev)
+int mcast_setup(char *str, char **mac_out, void *data)
 {
-	int err, n = mcast_count;
-	int num = 0;
-	char *p1, *p2;
-
-	dev->user = &mcast_user_info;
-	dev->kern = &mcast_kern_info;
-	dev->private_size = sizeof(struct mcast_data);
-	dev->transport_index = mcast_count++;
-
-	/* somewhat more sophisticated parser, needed for in_aton */
-
-	p1 = str;
-	if (*str == ',')
-		p1++;
-	while (p1 && *p1) {
-		if ((p2 = strchr(p1, ',')))
-			*p2++ = '\0';
-		if (strlen(p1) > 0) {
-			switch (num) {
-			case 0:
-				/* First argument: Ethernet address */
-				err = setup_etheraddr(p1, dev->mac);
-				if (!err) 
-					dev->have_mac = 1;
-				break;
-			case 1:
-				/* Second argument: Multicast group */
-				mcast_priv[n].addr = p1;
-				break;
-			case 2:
-				/* Third argument: Port number */
-				mcast_priv[n].port = 
-					htons(simple_strtoul(p1, NULL, 10));
-				break;
-			case 3:
-				/* Fourth argument: TTL */
-				mcast_priv[n].ttl = 
-						simple_strtoul(p1, NULL, 10);
-				break;
-			}
+	struct mcast_init *init = data;
+	char *port_str = NULL, *ttl_str = NULL, *remain;
+	char *last;
+	int n;
+
+	*init = ((struct mcast_init)
+		{ addr :	"239.192.168.1",
+		  port :	1102,
+		  ttl :		1 });
+
+	remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
+			       NULL);
+	if(remain != NULL){
+		printk(KERN_ERR "mcast_setup - Extra garbage on "
+		       "specification : '%s'\n", remain);
+		return(0);
+	}
+	
+	if(port_str != NULL){
+		n = simple_strtoul(port_str, &last, 10);
+		if(*last != '\0'){
+			printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", 
+			       port_str);
+			return(0);
+		}
+		init->port = htons(n);
+	}
+
+	if(ttl_str != NULL){
+		init->ttl = simple_strtoul(ttl_str, &last, 10);
+		if(*last != '\0'){
+			printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n", 
+			       ttl_str);
+			return(0);
 		}
-		p1 = p2;
-		num++;
 	}
 
-	printk(KERN_INFO "Configured mcast device: %s:%u-%u\n",
-		mcast_priv[n].addr, mcast_priv[n].port,
-		mcast_priv[n].ttl);
+	printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
+	       init->port, init->ttl);
 
-	return(0);
+	return(1);
 }
 
 static struct transport mcast_transport = {
-	list :	LIST_HEAD_INIT(mcast_transport.list),
-	name :	"mcast",
-	setup : mcast_setup
+	list :		LIST_HEAD_INIT(mcast_transport.list),
+	name :		"mcast",
+	setup : 	mcast_setup,
+	user :		&mcast_user_info,
+	kern :		&mcast_kern_info,
+	private_size :	sizeof(struct mcast_data),
+	setup_size :	sizeof(struct mcast_init),
 };
 
 static int register_mcast(void)
@@ -142,6 +132,7 @@ static int register_mcast(void)
 }
 
 __initcall(register_mcast);
+
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically

arch/um/drivers/mcast_kern.h

-#ifndef __UM_MCAST_KERN_H
-#define __UM_MCAST_KERN_H
-
-#include "net_kern.h"
-
-extern int mcast_setup(char *arg, struct uml_net *dev);
-
-#endif

arch/um/drivers/net_user.c

@@ -4,6 +4,7 @@
  */
 
 #include <stddef.h>
+#include <stdarg.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <errno.h>
@@ -220,6 +221,27 @@ void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
 	change(arg, "del", addr, netmask);
 }
 
+char *split_if_spec(char *str, ...)
+{
+	char **arg, *end;
+	va_list ap;
+
+	va_start(ap, str);
+	while((arg = va_arg(ap, char **)) != NULL){
+		if(*str == '\0')
+			return(NULL);
+		end = strchr(str, ',');
+		if(end != str)
+			*arg = str;
+		if(end == NULL)
+			return(NULL);
+		*end++ = '\0';
+		str = end;
+	}
+	va_end(ap);
+	return(str);
+}
+
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically

arch/um/drivers/pcap_kern.c

+/*
+ * Copyright (C) 2002 Jeff Dike <jdike@karaya.com>
+ * Licensed under the GPL.
+ */
+
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/etherdevice.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "pcap_user.h"
+
+struct pcap_init {
+	char *host_if;
+	int promisc;
+	int optimize;
+	char *filter;
+};
+
+void pcap_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct pcap_data *ppri;
+	struct pcap_init *init = data;
+
+	init_etherdev(dev, 0);
+	pri = dev->priv;
+	ppri = (struct pcap_data *) pri->user;
+	*ppri = ((struct pcap_data)
+		{ host_if :	init->host_if,
+		  promisc :	init->promisc,
+		  optimize :	init->optimize,
+		  filter :	init->filter,
+		  compiled :	NULL,
+		  pcap :	NULL });
+}
+
+static int pcap_read(int fd, struct sk_buff **skb, 
+		       struct uml_net_private *lp)
+{
+	*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
+	if(*skb == NULL) return(-ENOMEM);
+	return(pcap_user_read(fd, (*skb)->mac.raw, 
+			      (*skb)->dev->mtu + ETH_HEADER_OTHER,
+			      (struct pcap_data *) &lp->user));
+}
+
+static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+{
+	return(-EPERM);
+}
+
+static struct net_kern_info pcap_kern_info = {
+	init:			pcap_init,
+	protocol:		eth_protocol,
+	read:			pcap_read,
+	write:			pcap_write,
+};
+
+int pcap_setup(char *str, char **mac_out, void *data)
+{
+	struct pcap_init *init = data;
+	char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
+	int i;
+
+	*init = ((struct pcap_init)
+		{ host_if :	"eth0",
+		  promisc :	1,
+		  optimize :	0,
+		  filter :	NULL });
+
+	remain = split_if_spec(str, &host_if, &init->filter, 
+			       &options[0], &options[1], NULL);
+	if(remain != NULL){
+		printk(KERN_ERR "pcap_setup - Extra garbage on "
+		       "specification : '%s'\n", remain);
+		return(0);
+	}
+
+	if(host_if != NULL)
+		init->host_if = host_if;
+
+	for(i = 0; i < sizeof(options)/sizeof(options[0]); i++){
+		if(options[i] == NULL)
+			continue;
+		if(!strcmp(options[i], "promisc"))
+			init->promisc = 1;
+		else if(!strcmp(options[i], "nopromisc"))
+			init->promisc = 0;
+		else if(!strcmp(options[i], "optimize"))
+			init->optimize = 1;
+		else if(!strcmp(options[i], "nooptimize"))
+			init->optimize = 0;
+		else printk("pcap_setup : bad option - '%s'\n", options[i]);
+	}
+
+	return(1);
+}
+
+static struct transport pcap_transport = {
+	list :		LIST_HEAD_INIT(pcap_transport.list),
+	name :		"pcap",
+	setup : 	pcap_setup,
+	user :		&pcap_user_info,
+	kern :		&pcap_kern_info,
+	private_size :	sizeof(struct pcap_data),
+	setup_size :	sizeof(struct pcap_init),
+};
+
+static int register_pcap(void)
+{
+	register_transport(&pcap_transport);
+	return(1);
+}
+
+__initcall(register_pcap);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */

arch/um/drivers/pcap_user.c

+/*
+ * Copyright (C) 2002 Jeff Dike <jdike@karaya.com>
+ * Licensed under the GPL.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <pcap.h>
+#include <asm/types.h>
+#include "net_user.h"
+#include "pcap_user.h"
+#include "user.h"
+
+#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
+
+#define PCAP_FD(p) (*(int *)(p))
+
+static void pcap_user_init(void *data, void *dev)
+{
+	struct pcap_data *pri = data;
+	pcap_t *p;
+	char errors[PCAP_ERRBUF_SIZE];
+
+	p = pcap_open_live(pri->host_if, MAX_PACKET, pri->promisc, 0, errors);
+	if(p == NULL){
+		printk("pcap_user_init : pcap_open_live failed - '%s'\n", 
+		       errors);
+		return;
+	}
+
+	pri->dev = dev;
+	pri->pcap = p;
+}
+
+static int pcap_open(void *data)
+{
+	struct pcap_data *pri = data;
+	__u32 netmask;
+	int err;
+
+	if(pri->pcap == NULL)
+		return(-ENODEV);
+
+	if(pri->filter != NULL){
+		err = dev_netmask(pri->dev, &netmask);
+		if(err < 0){
+			printk("pcap_open : dev_netmask failed\n");
+			return(-EIO);
+		}
+
+		pri->compiled = um_kmalloc(sizeof(struct bpf_program));
+		if(pri->compiled == NULL){
+			printk("pcap_open : kmalloc failed\n");
+			return(-ENOMEM);
+		}
+		
+		err = pcap_compile(pri->pcap, 
+				   (struct bpf_program *) pri->compiled, 
+				   pri->filter, pri->optimize, netmask);
+		if(err < 0){
+			printk("pcap_open : pcap_compile failed - '%s'\n", 
+			       pcap_geterr(pri->pcap));
+			return(-EIO);
+		}
+
+		err = pcap_setfilter(pri->pcap, pri->compiled);
+		if(err < 0){
+			printk("pcap_open : pcap_setfilter failed - '%s'\n", 
+			       pcap_geterr(pri->pcap));
+			return(-EIO);
+		}
+	}
+	
+	return(PCAP_FD(pri->pcap));
+}
+
+static void pcap_remove(void *data)
+{
+	struct pcap_data *pri = data;
+
+	if(pri->compiled != NULL)
+		pcap_freecode(pri->compiled);
+
+	pcap_close(pri->pcap);
+}
+
+struct pcap_handler_data {
+	char *buffer;
+	int len;
+};
+
+static void handler(u_char *data, const struct pcap_pkthdr *header, 
+		    const u_char *packet)
+{
+	int len;
+
+	struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
+
+	len = hdata->len < header->caplen ? hdata->len : header->caplen;
+	memcpy(hdata->buffer, packet, len);
+	hdata->len = len;
+}
+
+int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
+{
+	struct pcap_handler_data hdata = ((struct pcap_handler_data)
+		                          { buffer : 	buffer,
+					    len :	len });
+	int n;
+
+	n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
+	if(n < 0){
+		printk("pcap_dispatch failed - %s\n", pcap_geterr(pri->pcap));
+		return(-EIO);
+	}
+	else if(n == 0) 
+		return(0);
+	return(hdata.len);
+}
+
+struct net_user_info pcap_user_info = {
+	init:		pcap_user_init,
+	open:		pcap_open,
+	close:	 	NULL,
+	remove:	 	pcap_remove,
+	set_mtu:	NULL,
+	add_address:	NULL,
+	delete_address: NULL,
+	max_packet:	MAX_PACKET - ETH_HEADER_OTHER
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */

arch/um/os-Linux/drivers/tuntap_kern.h → arch/um/drivers/pcap_user.h

 /* 
- * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
 
-#ifndef __UM_TUNTAP_KERN_H
-#define __UM_TUNTAP_KERN_H
+#include "net_user.h"
 
-#include "net_kern.h"
+struct pcap_data {
+	char *host_if;
+	int promisc;
+	int optimize;
+	char *filter;
+	void *compiled;
+	void *pcap;
+	void *dev;
+};
 
-extern int tuntap_setup(char *arg, struct uml_net *dev);
+extern struct net_user_info pcap_user_info;
 
-#endif
+extern int pcap_user_read(int fd, void *buf, int len, struct pcap_data *pri);
 
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.

arch/um/drivers/slip_kern.c

@@ -7,28 +7,29 @@
 #include "net_user.h"
 #include "kern.h"
 #include "slip.h"
-#include "slip_kern.h"
 
-struct slip_data slip_priv[MAX_UML_NETDEV] = {
-	[ 0 ... MAX_UML_NETDEV - 1 ] =
-	{
-		addr:		NULL,
-		gate_addr:	NULL,
-		slave:		-1,
-		buf: 		{ 0 },
-		pos:		0,
-		esc:		0,
-	}
+struct slip_init {
+	char *gate_addr;
 };
 
-void slip_init(struct net_device *dev, int index)
+void slip_init(struct net_device *dev, void *data)
 {
 	struct uml_net_private *private;
 	struct slip_data *spri;
+	struct slip_init *init = data;
 
 	private = dev->priv;
 	spri = (struct slip_data *) private->user;
-	*spri = slip_priv[index];
+	*spri = ((struct slip_data)
+		{ name :	{ '\0' },
+		  addr:		NULL,
+		  gate_addr :	init->gate_addr,
+		  slave : 	0,
+		  buf : 	{ '\0' },
+		  pos :		0,
+		  esc :		0,
+		  dev :		dev });
+
 	strncpy(dev->name, "umn", IFNAMSIZ);
 	dev->init = NULL;
 	dev->hard_header_len = 0;
@@ -67,26 +68,26 @@ struct net_kern_info slip_kern_info = {
 	write:			slip_write,
 };
 
-static int slip_count = 0;
-
-int slip_setup(char *str, struct uml_net *dev)
+static int slip_setup(char *str, char **mac_out, void *data)
 {
-	int n = slip_count;
+	struct slip_init *init = data;
 
-	dev->user = &slip_user_info;
-	dev->kern = &slip_kern_info;
-	dev->private_size = sizeof(struct slip_data);
-	dev->transport_index = slip_count++;
-	if(*str != ',') return(0);
-	str++;
-	if(str[0] != '\0') slip_priv[n].gate_addr = str;
-	return(0);
+	*init = ((struct slip_init)
+		{ gate_addr :		NULL });
+
+	if(str[0] != '\0') 
+		init->gate_addr = str;
+	return(1);
 }
 
 static struct transport slip_transport = {
-	list :	LIST_HEAD_INIT(slip_transport.list),
-	name :	"slip",
-	setup : slip_setup
+	list :		LIST_HEAD_INIT(slip_transport.list),
+	name :		"slip",
+	setup : 	slip_setup,
+	user :		&slip_user_info,
+	kern :		&slip_kern_info,
+	private_size :	sizeof(struct slip_data),
+	setup_size :	sizeof(struct slip_init),
 };
 
 static int register_slip(void)

arch/um/drivers/slip_kern.h

-#ifndef __UM_SLIP_KERN_H
-#define __UM_SLIP_KERN_H
-
-#include "net_kern.h"
-
-extern int slip_setup(char *arg, struct uml_net *dev);
-
-#endif

arch/um/include/net_kern.h

@@ -6,14 +6,10 @@
 #include "linux/socket.h"
 #include "linux/list.h"
 
-#define MAX_UML_NETDEV (16)
-
 struct uml_net {
+	struct list_head list;
 	struct net_device *dev;
-	struct net_user_info *user;
-	struct net_kern_info *kern;
-	int private_size;
-	int transport_index;
+	int index;
 	unsigned char mac[ETH_ALEN];
 	int have_mac;
 };
@@ -41,7 +37,7 @@ struct uml_net_private {
 };
 
 struct net_kern_info {
-	void (*init)(struct net_device *, int);
+	void (*init)(struct net_device *, void *);
 	unsigned short (*protocol)(struct sk_buff *);
 	int (*read)(int, struct sk_buff **skb, struct uml_net_private *);
 	int (*write)(int, struct sk_buff **skb, struct uml_net_private *);
@@ -50,7 +46,11 @@ struct net_kern_info {
 struct transport {
 	struct list_head list;
 	char *name;
-	int (*setup)(char *, struct uml_net *);
+	int (*setup)(char *, char **, void *);
+	struct net_user_info *user;
+	struct net_kern_info *kern;
+	int private_size;
+	int setup_size;
 };
 
 extern struct net_device *ether_init(int);
@@ -58,8 +58,9 @@ extern unsigned short ether_protocol(struct sk_buff *);
 extern int setup_etheraddr(char *str, unsigned char *addr);
 extern struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra);
 extern int tap_setup_common(char *str, char *type, char **dev_name, 
-			    char *hw_addr, int *hw_setup, char **gate_addr);
+			    char **mac_out, char **gate_addr);
 extern void register_transport(struct transport *new);
+extern unsigned short eth_protocol(struct sk_buff *skb);
 
 #endif
 

arch/um/include/net_user.h

@@ -43,6 +43,10 @@ extern int net_sendto(int fd, void *buf, int len, void *to, int sock_len);
 extern void open_addr(unsigned char *addr, unsigned char *netmask, void *arg);
 extern void close_addr(unsigned char *addr, unsigned char *netmask, void *arg);
 
+extern char *split_if_spec(char *str, ...);
+
+extern int dev_netmask(void *d, void *m);
+
 #endif
 
 /*

arch/um/os-Linux/drivers/etap_kern.h

-/* 
- * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __UM_ETHERTAP_KERN_H
-#define __UM_ETHERTAP_KERN_H
-
-#include "net_kern.h"
-
-extern int ethertap_setup(char *arg, struct uml_net *dev);
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

arch/um/os-Linux/drivers/ethertap_kern.c

@@ -12,42 +12,32 @@
 #include "net_kern.h"
 #include "net_user.h"
 #include "etap.h"
-#include "etap_kern.h"
 
-struct ethertap_setup {
+struct ethertap_init {
 	char *dev_name;
 	char *gate_addr;
 };
 
-struct ethertap_setup ethertap_priv[MAX_UML_NETDEV] = { 
-	[ 0 ... MAX_UML_NETDEV - 1 ] =
-	{
-		dev_name:	NULL,
-		gate_addr:	NULL,
-	}
-};
-
-static void etap_init(struct net_device *dev, int index)
+static void etap_init(struct net_device *dev, void *data)
 {
 	struct uml_net_private *pri;
 	struct ethertap_data *epri;
+	struct ethertap_init *init = data;
 
 	init_etherdev(dev, 0);
 	pri = dev->priv;
 	epri = (struct ethertap_data *) pri->user;
-	epri->dev_name = ethertap_priv[index].dev_name;
-	epri->gate_addr = ethertap_priv[index].gate_addr;
+	*epri = ((struct ethertap_data)
+		{ dev_name :		init->dev_name,
+		  gate_addr :		init->gate_addr,
+		  data_fd :		-1,
+		  control_fd :		-1,
+		  dev :			dev });
+
 	printk("ethertap backend - %s", epri->dev_name);
 	if(epri->gate_addr != NULL) 
 		printk(", IP = %s", epri->gate_addr);
 	printk("\n");
-	epri->data_fd = -1;
-	epri->control_fd = -1;
-}
-
-static unsigned short etap_protocol(struct sk_buff *skb)
-{
-	return(eth_type_trans(skb, skb->dev));
 }
 
 static int etap_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
@@ -80,38 +70,36 @@ static int etap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
 
 struct net_kern_info ethertap_kern_info = {
 	init:			etap_init,
-	protocol:		etap_protocol,
+	protocol:		eth_protocol,
 	read:			etap_read,
 	write: 			etap_write,
 };
 
-static int ethertap_count = 0;
-
-int ethertap_setup(char *str, struct uml_net *dev)
+int ethertap_setup(char *str, char **mac_out, void *data)
 {
-	struct ethertap_setup *pri;
-	int err;
-
-	pri = &ethertap_priv[ethertap_count];
-	err = tap_setup_common(str, "ethertap", &pri->dev_name, dev->mac,
-			       &dev->have_mac, &pri->gate_addr);
-	if(err) return(err);
-	if(pri->dev_name == NULL){
+	struct ethertap_init *init = data;
+
+	*init = ((struct ethertap_init)
+		{ dev_name :	NULL,
+		  gate_addr :	NULL });
+	if(tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
+			    &init->gate_addr))
+		return(0);
+	if(init->dev_name == NULL){
 		printk("ethertap_setup : Missing tap device name\n");
-		return(1);
+		return(0);
 	}
 
-	dev->user = &ethertap_user_info;
-	dev->kern = &ethertap_kern_info;
-	dev->private_size = sizeof(struct ethertap_data);
-	dev->transport_index = ethertap_count++;
-	return(0);
+	return(1);
 }
 
 static struct transport ethertap_transport = {
-	list :	LIST_HEAD_INIT(ethertap_transport.list),
-	name :	"ethertap",
-	setup : ethertap_setup
+	list :		LIST_HEAD_INIT(ethertap_transport.list),
+	name :		"ethertap",
+	setup : 	ethertap_setup,
+	user :		&ethertap_user_info,
+	kern :		&ethertap_kern_info,
+	private_size :	sizeof(struct ethertap_data),
 };
 
 static int register_ethertap(void)

arch/um/os-Linux/drivers/tuntap.h

@@ -14,8 +14,6 @@ struct tuntap_data {
 	char *gate_addr;
 	int fd;
 	void *dev;
-	unsigned char hw_addr[ETH_ADDR_LEN];
-	int hw_setup;
 };
 
 extern struct net_user_info tuntap_user_info;

arch/um/os-Linux/drivers/tuntap_kern.c

@@ -13,40 +13,30 @@
 #include "net_user.h"
 #include "tuntap.h"
 
-struct tuntap_setup {
+struct tuntap_init {
 	char *dev_name;
 	char *gate_addr;
 };
 
-struct tuntap_setup tuntap_priv[MAX_UML_NETDEV] = { 
-	[ 0 ... MAX_UML_NETDEV - 1 ] =
-	{
-		dev_name:	NULL,
-		gate_addr:	NULL,
-	}
-};
-
-static void tuntap_init(struct net_device *dev, int index)
+static void tuntap_init(struct net_device *dev, void *data)
 {
 	struct uml_net_private *pri;
 	struct tuntap_data *tpri;
+	struct tuntap_init *init = data;
 
 	init_etherdev(dev, 0);
 	pri = dev->priv;
 	tpri = (struct tuntap_data *) pri->user;
-	tpri->dev_name = tuntap_priv[index].dev_name;
-	tpri->fixed_config = (tpri->dev_name != NULL);
-	tpri->gate_addr = tuntap_priv[index].gate_addr;
+	*tpri = ((struct tuntap_data)
+		{ dev_name :		init->dev_name,
+		  fixed_config :	(init->dev_name != NULL),
+		  gate_addr :		init->gate_addr,
+		  fd :			-1,
+		  dev :			dev });
 	printk("TUN/TAP backend - ");
 	if(tpri->gate_addr != NULL) 
 		printk("IP = %s", tpri->gate_addr);
 	printk("\n");
-	tpri->fd = -1;
-}
-
-static unsigned short tuntap_protocol(struct sk_buff *skb)
-{
-	return(eth_type_trans(skb, skb->dev));
 }
 
 static int tuntap_read(int fd, struct sk_buff **skb, 
@@ -66,34 +56,33 @@ static int tuntap_write(int fd, struct sk_buff **skb,
 
 struct net_kern_info tuntap_kern_info = {
 	init:			tuntap_init,
-	protocol:		tuntap_protocol,
+	protocol:		eth_protocol,
 	read:			tuntap_read,
 	write: 			tuntap_write,
 };
 
-static int tuntap_count = 0;
-
-int tuntap_setup(char *str, struct uml_net *dev)
+int tuntap_setup(char *str, char **mac_out, void *data)
 {
-	struct tuntap_setup *pri;
-	int err;
+	struct tuntap_init *init = data;
 
-	pri = &tuntap_priv[tuntap_count];
-	err = tap_setup_common(str, "tuntap", &pri->dev_name, dev->mac,  
-			       &dev->have_mac, &pri->gate_addr);
-	if(err) return(err);
+	*init = ((struct tuntap_init)
+		{ dev_name :	NULL,
+		  gate_addr :	NULL });
+	if(tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
+			    &init->gate_addr))
+		return(0);
 
-	dev->user = &tuntap_user_info;
-	dev->kern = &tuntap_kern_info;
-	dev->private_size = sizeof(struct tuntap_data);
-	dev->transport_index = tuntap_count++;
-	return(0);
+	return(1);
 }
 
 static struct transport tuntap_transport = {
-	list :	LIST_HEAD_INIT(tuntap_transport.list),
-	name :	"tuntap",
-	setup : tuntap_setup
+	list :		LIST_HEAD_INIT(tuntap_transport.list),
+	name :		"tuntap",
+	setup : 	tuntap_setup,
+	user :		&tuntap_user_info,
+	kern :		&tuntap_kern_info,
+	private_size :	sizeof(struct tuntap_data),
+	setup_size :	sizeof(struct tuntap_init),
 };
 
 static int register_tuntap(void)