Copied in the new files for the slirp transport and slip cleanup.

arch/um/drivers/slip_proto.h

+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_SLIP_PROTO_H__
+#define __UM_SLIP_PROTO_H__
+
+/* SLIP protocol characters. */
+#define SLIP_END             0300	/* indicates end of frame	*/
+#define SLIP_ESC             0333	/* indicates byte stuffing	*/
+#define SLIP_ESC_END         0334	/* ESC ESC_END means END 'data'	*/
+#define SLIP_ESC_ESC         0335	/* ESC ESC_ESC means ESC 'data'	*/
+
+static inline int slip_unesc(unsigned char c,char *buf,int *pos, int *esc)
+{
+	int ret;
+
+	switch(c){
+	case SLIP_END:
+		*esc = 0;
+		ret=*pos;
+		*pos=0;
+		return(ret);
+	case SLIP_ESC:
+		*esc = 1;
+		return(0);
+	case SLIP_ESC_ESC:
+		if(*esc){
+			*esc = 0;
+			c = SLIP_ESC;
+		}
+		break;
+	case SLIP_ESC_END:
+		if(*esc){
+			*esc = 0;
+			c = SLIP_END;
+		}
+		break;
+	}
+	buf[(*pos)++] = c;
+	return(0);
+}
+
+static inline int slip_esc(unsigned char *s, unsigned char *d, int len)
+{
+	unsigned char *ptr = d;
+	unsigned char c;
+
+	/*
+	 * Send an initial END character to flush out any
+	 * data that may have accumulated in the receiver
+	 * due to line noise.
+	 */
+
+	*ptr++ = SLIP_END;
+
+	/*
+	 * For each byte in the packet, send the appropriate
+	 * character sequence, according to the SLIP protocol.
+	 */
+
+	while (len-- > 0) {
+		switch(c = *s++) {
+		case SLIP_END:
+			*ptr++ = SLIP_ESC;
+			*ptr++ = SLIP_ESC_END;
+			break;
+		case SLIP_ESC:
+			*ptr++ = SLIP_ESC;
+			*ptr++ = SLIP_ESC_ESC;
+			break;
+		default:
+			*ptr++ = c;
+			break;
+		}
+	}
+	*ptr++ = SLIP_END;
+	return (ptr - d);
+}
+
+#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/drivers/slirp.h

+#ifndef __UM_SLIRP_H
+#define __UM_SLIRP_H
+
+#define BUF_SIZE 1500
+ /* two bytes each for a (pathological) max packet of escaped chars +  * 
+  * terminating END char + initial END char                            */
+#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
+
+#define SLIRP_MAX_ARGS 100
+/*
+ * XXX this next definition is here because I don't understand why this
+ * initializer doesn't work in slirp_kern.c:
+ *
+ *   argv :  { init->argv[ 0 ... SLIRP_MAX_ARGS-1 ] },
+ *
+ * or why I can't typecast like this:
+ *
+ *   argv :  (char* [SLIRP_MAX_ARGS])(init->argv), 
+ */
+struct arg_list_dummy_wrapper { char *argv[SLIRP_MAX_ARGS]; };
+
+struct slirp_data {
+	void *dev;
+	struct arg_list_dummy_wrapper argw;
+	int pid;
+	int slave;
+	char ibuf[ENC_BUF_SIZE];
+	char obuf[ENC_BUF_SIZE];
+	int more; /* more data: do not read fd until ibuf has been drained */
+	int pos;
+	int esc;
+};
+
+extern struct net_user_info slirp_user_info;
+
+extern int set_umn_addr(int fd, char *addr, char *ptp_addr);
+extern int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri);
+extern int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri);
+
+#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/drivers/slirp_kern.c

+#include "linux/kernel.h"
+#include "linux/stddef.h"
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/if_arp.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "kern.h"
+#include "slirp.h"
+
+struct slirp_init {
+	struct arg_list_dummy_wrapper argw;  /* XXX should be simpler... */
+};
+
+void slirp_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *private;
+	struct slirp_data *spri;
+	struct slirp_init *init = data;
+	int i;
+
+	private = dev->priv;
+	spri = (struct slirp_data *) private->user;
+	*spri = ((struct slirp_data)
+		{ argw :	init->argw,
+		  pid : 	-1,
+		  slave : 	-1,
+		  ibuf : 	{ '\0' },
+		  obuf : 	{ '\0' },
+		  pos :		0,
+		  esc :		0,
+		  dev :		dev });
+
+	dev->init = NULL;
+	dev->hard_header_len = 0;
+	dev->addr_len = 4;
+	dev->type = ARPHRD_ETHER;
+	dev->tx_queue_len = 256;
+	dev->flags = IFF_NOARP;
+	printk("SLIRP backend - command line:");
+	for(i=0;spri->argw.argv[i]!=NULL;i++) {
+		printk(" '%s'",spri->argw.argv[i]);
+	}
+	printk("\n");
+}
+
+static unsigned short slirp_protocol(struct sk_buff *skbuff)
+{
+	return(htons(ETH_P_IP));
+}
+
+static int slirp_read(int fd, struct sk_buff **skb, 
+		       struct uml_net_private *lp)
+{
+	return(slirp_user_read(fd, (*skb)->mac.raw, (*skb)->dev->mtu, 
+			      (struct slirp_data *) &lp->user));
+}
+
+static int slirp_write(int fd, struct sk_buff **skb,
+		      struct uml_net_private *lp)
+{
+	return(slirp_user_write(fd, (*skb)->data, (*skb)->len, 
+			       (struct slirp_data *) &lp->user));
+}
+
+struct net_kern_info slirp_kern_info = {
+	init:			slirp_init,
+	protocol:		slirp_protocol,
+	read:			slirp_read,
+	write:			slirp_write,
+};
+
+static int slirp_setup(char *str, char **mac_out, void *data)
+{
+	struct slirp_init *init = data;
+	int i=0;
+
+	*init = ((struct slirp_init)
+		{ argw :		{ { "slirp", NULL  } } });
+
+	str = split_if_spec(str, mac_out, NULL);
+
+	if(str == NULL) { /* no command line given after MAC addr */
+		return(1);
+	}
+
+	do {
+		if(i>=SLIRP_MAX_ARGS-1) {
+			printk("slirp_setup: truncating slirp arguments\n");
+			break;
+		}
+		init->argw.argv[i++] = str;
+		while(*str && *str!=',') {
+			if(*str=='_') *str=' ';
+			str++;
+		}
+		if(*str!=',')
+			break;
+		*str++='\0';
+	} while(1);
+	init->argw.argv[i]=NULL;
+	return(1);
+}
+
+static struct transport slirp_transport = {
+	list :		LIST_HEAD_INIT(slirp_transport.list),
+	name :		"slirp",
+	setup : 	slirp_setup,
+	user :		&slirp_user_info,
+	kern :		&slirp_kern_info,
+	private_size :	sizeof(struct slirp_data),
+	setup_size :	sizeof(struct slirp_init),
+};
+
+static int register_slirp(void)
+{
+	register_transport(&slirp_transport);
+	return(1);
+}
+
+__initcall(register_slirp);
+
+/*
+ * 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/slirp_user.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sched.h>
+#include <string.h>
+#include <sys/fcntl.h>
+#include <sys/errno.h>
+#include <sys/wait.h>
+#include <sys/signal.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "net_user.h"
+#include "slirp.h"
+#include "slip_proto.h"
+#include "helper.h"
+#include "os.h"
+
+void slirp_user_init(void *data, void *dev)
+{
+	struct slirp_data *pri = data;
+
+	pri->dev = dev;
+}
+
+struct slirp_pre_exec_data {
+	int stdin;
+	int stdout;
+};
+
+static void slirp_pre_exec(void *arg)
+{
+	struct slirp_pre_exec_data *data = arg;
+
+	if(data->stdin != -1) dup2(data->stdin, 0);
+	if(data->stdout != -1) dup2(data->stdout, 1);
+}
+
+static int slirp_tramp(char **argv, int fd)
+{
+	struct slirp_pre_exec_data pe_data;
+	int pid;
+
+	pe_data.stdin = fd;
+	pe_data.stdout = fd;
+	pid = run_helper(slirp_pre_exec, &pe_data, argv, NULL);
+
+	return(pid);
+}
+ 
+static int slirp_datachan(int *mfd, int *sfd)
+{
+	int fds[2], err;
+
+	err = os_pipe(fds, 1, 1);
+	if(err){
+		printk("slirp_datachan: Failed to open pipe, errno = %d\n",
+		       -err);
+		return(err);
+	}
+
+	*mfd = fds[0];
+	*sfd = fds[1];
+	return(0);
+}
+
+static int slirp_open(void *data)
+{
+	struct slirp_data *pri = data;
+	int sfd, mfd, pid, err;
+
+	err = slirp_datachan(&mfd, &sfd);
+	if(err)
+		return(err);
+
+	pid = slirp_tramp(pri->argw.argv, sfd);
+
+	if(pid < 0){
+		printk("slirp_tramp failed - errno = %d\n", pid);
+		os_close_file(sfd);	
+		os_close_file(mfd);	
+		return(pid);
+	}
+
+	pri->slave = sfd;
+	pri->pos = 0;
+	pri->esc = 0;
+
+	pri->pid = pid;
+
+	return(mfd);
+}
+
+static void slirp_close(int fd, void *data)
+{
+	struct slirp_data *pri = data;
+	int status,err;
+
+	close(fd);
+	close(pri->slave);
+
+	pri->slave = -1;
+
+	if(pri->pid<1) {
+		printk("slirp_close: no child process to shut down\n");
+		return;
+	}
+
+#if 0
+	if(kill(pri->pid, SIGHUP)<0) {
+		printk("slirp_close: sending hangup to %d failed (%d)\n",
+			pri->pid, errno);
+	}
+#endif
+
+	err = waitpid(pri->pid, &status, WNOHANG);
+	if(err<0) {
+		printk("slirp_close: waitpid returned %d\n", errno);
+		return;
+	}
+
+	if(err==0) {
+		printk("slirp_close: process %d has not exited\n");
+		return;
+	}
+
+	pri->pid = -1;
+}
+
+int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
+{
+	int i, n, size, start;
+
+	if(pri->more>0) {
+		i = 0;
+		while(i < pri->more) {
+			size = slip_unesc(pri->ibuf[i++],
+					pri->ibuf,&pri->pos,&pri->esc);
+			if(size){
+				memcpy(buf, pri->ibuf, size);
+				memmove(pri->ibuf, &pri->ibuf[i], pri->more-i);
+				pri->more=pri->more-i; 
+				return(size);
+			}
+		}
+		pri->more=0;
+	}
+
+	n = net_read(fd, &pri->ibuf[pri->pos], sizeof(pri->ibuf) - pri->pos);
+	if(n <= 0) return(n);
+
+	start = pri->pos;
+	for(i = 0; i < n; i++){
+		size = slip_unesc(pri->ibuf[start + i],
+				pri->ibuf,&pri->pos,&pri->esc);
+		if(size){
+			memcpy(buf, pri->ibuf, size);
+			memmove(pri->ibuf, &pri->ibuf[start+i+1], n-(i+1));
+			pri->more=n-(i+1); 
+			return(size);
+		}
+	}
+	return(0);
+}
+
+int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
+{
+	int actual, n;
+
+	actual = slip_esc(buf, pri->obuf, len);
+	n = net_write(fd, pri->obuf, actual);
+	if(n < 0) return(n);
+	else return(len);
+}
+
+static int slirp_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+struct net_user_info slirp_user_info = {
+	init:		slirp_user_init,
+	open:		slirp_open,
+	close:	 	slirp_close,
+	remove:	 	NULL,
+	set_mtu:	slirp_set_mtu,
+	add_address:	NULL,
+	delete_address: NULL,
+	max_packet:	BUF_SIZE
+};
+
+/*
+ * 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:
+ */