1 files changed, 255 insertions, 0 deletions

diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
new file mode 100644
index 000000000000..47229fe4a813
--- /dev/null
+++ b/arch/um/drivers/net_user.c
@@ -0,0 +1,255 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include "user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "net_user.h"
+#include "helper.h"
+#include "os.h"
+
+int tap_open_common(void *dev, char *gate_addr)
+{
+        int tap_addr[4];
+
+        if(gate_addr == NULL) return(0);
+        if(sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0], 
+                  &tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4){
+                printk("Invalid tap IP address - '%s'\n", gate_addr);
+                return(-EINVAL);
+        }
+        return(0);
+}
+
+void tap_check_ips(char *gate_addr, char *eth_addr)
+{
+        int tap_addr[4];
+
+        if((gate_addr != NULL) && 
+           (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0], 
+                   &tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
+           (eth_addr[0] == tap_addr[0]) && 
+           (eth_addr[1] == tap_addr[1]) && 
+           (eth_addr[2] == tap_addr[2]) && 
+           (eth_addr[3] == tap_addr[3])){
+                printk("The tap IP address and the UML eth IP address"
+                       " must be different\n");
+        }
+}
+
+void read_output(int fd, char *output, int len)
+{
+        int remain, n, actual;
+        char c;
+
+        if(output == NULL){
+                output = &c;
+                len = sizeof(c);
+        }
+                
+        *output = '\0';
+        n = os_read_file(fd, &remain, sizeof(remain));
+        if(n != sizeof(remain)){
+                printk("read_output - read of length failed, err = %d\n", -n);
+                return;
+        }
+
+        while(remain != 0){
+                n = (remain < len) ? remain : len;
+                actual = os_read_file(fd, output, n);
+                if(actual != n){
+                        printk("read_output - read of data failed, "
+                               "err = %d\n", -actual);
+                        return;
+                }
+                remain -= actual;
+        }
+        return;
+}
+
+int net_read(int fd, void *buf, int len)
+{
+        int n;
+
+        n = os_read_file(fd,  buf,  len);
+
+        if(n == -EAGAIN)
+                return(0);
+        else if(n == 0)
+                return(-ENOTCONN);
+        return(n);
+}
+
+int net_recvfrom(int fd, void *buf, int len)
+{
+        int n;
+
+        while(((n = recvfrom(fd,  buf,  len, 0, NULL, NULL)) < 0) && 
+              (errno == EINTR)) ;
+
+        if(n < 0){
+                if(errno == EAGAIN) return(0);
+                return(-errno);
+        }
+        else if(n == 0) return(-ENOTCONN);
+        return(n);
+}
+
+int net_write(int fd, void *buf, int len)
+{
+        int n;
+
+        n = os_write_file(fd, buf, len);
+
+        if(n == -EAGAIN)
+                return(0);
+        else if(n == 0)
+                return(-ENOTCONN);
+        return(n);
+}
+
+int net_send(int fd, void *buf, int len)
+{
+        int n;
+
+        while(((n = send(fd, buf, len, 0)) < 0) && (errno == EINTR)) ;
+        if(n < 0){
+                if(errno == EAGAIN) return(0);
+                return(-errno);
+        }
+        else if(n == 0) return(-ENOTCONN);
+        return(n);      
+}
+
+int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
+{
+        int n;
+
+        while(((n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
+                           sock_len)) < 0) && (errno == EINTR)) ;
+        if(n < 0){
+                if(errno == EAGAIN) return(0);
+                return(-errno);
+        }
+        else if(n == 0) return(-ENOTCONN);
+        return(n);      
+}
+
+struct change_pre_exec_data {
+        int close_me;
+        int stdout;
+};
+
+static void change_pre_exec(void *arg)
+{
+        struct change_pre_exec_data *data = arg;
+
+        os_close_file(data->close_me);
+        dup2(data->stdout, 1);
+}
+
+static int change_tramp(char **argv, char *output, int output_len)
+{
+        int pid, fds[2], err;
+        struct change_pre_exec_data pe_data;
+
+        err = os_pipe(fds, 1, 0);
+        if(err < 0){
+                printk("change_tramp - pipe failed, err = %d\n", -err);
+                return(err);
+        }
+        pe_data.close_me = fds[0];
+        pe_data.stdout = fds[1];
+        pid = run_helper(change_pre_exec, &pe_data, argv, NULL);
+
+        read_output(fds[0], output, output_len);
+        os_close_file(fds[0]);
+        os_close_file(fds[1]);
+
+        if (pid > 0)
+                CATCH_EINTR(err = waitpid(pid, NULL, 0));
+        return(pid);
+}
+
+static void change(char *dev, char *what, unsigned char *addr,
+                   unsigned char *netmask)
+{
+        char addr_buf[sizeof("255.255.255.255\0")];
+        char netmask_buf[sizeof("255.255.255.255\0")];
+        char version[sizeof("nnnnn\0")];
+        char *argv[] = { "uml_net", version, what, dev, addr_buf, 
+                         netmask_buf, NULL };
+        char *output;
+        int output_len, pid;
+
+        sprintf(version, "%d", UML_NET_VERSION);
+        sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
+        sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1], 
+                netmask[2], netmask[3]);
+
+        output_len = page_size();
+        output = um_kmalloc(output_len);
+        if(output == NULL)
+                printk("change : failed to allocate output buffer\n");
+
+        pid = change_tramp(argv, output, output_len);
+        if(pid < 0) return;
+
+        if(output != NULL){
+                printk("%s", output);
+                kfree(output);
+        }
+}
+
+void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
+{
+        change(arg, "add", addr, netmask);
+}
+
+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
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */