1 files changed, 280 insertions, 0 deletions

diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
new file mode 100644
index 000000000000..d94846b1b4cf
--- /dev/null
+++ b/arch/um/drivers/slip_user.c
@@ -0,0 +1,280 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sched.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/termios.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 "slip.h"
+#include "slip_proto.h"
+#include "helper.h"
+#include "os.h"
+
+void slip_user_init(void *data, void *dev)
+{
+        struct slip_data *pri = data;
+
+        pri->dev = dev;
+}
+
+static int set_up_tty(int fd)
+{
+        int i;
+        struct termios tios;
+
+        if (tcgetattr(fd, &tios) < 0) {
+                printk("could not get initial terminal attributes\n");
+                return(-1);
+        }
+
+        tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
+        tios.c_iflag = IGNBRK | IGNPAR;
+        tios.c_oflag = 0;
+        tios.c_lflag = 0;
+        for (i = 0; i < NCCS; i++)
+                tios.c_cc[i] = 0;
+        tios.c_cc[VMIN] = 1;
+        tios.c_cc[VTIME] = 0;
+
+        cfsetospeed(&tios, B38400);
+        cfsetispeed(&tios, B38400);
+
+        if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+                printk("failed to set terminal attributes\n");
+                return(-1);
+        }
+        return(0);
+}
+
+struct slip_pre_exec_data {
+        int stdin;
+        int stdout;
+        int close_me;
+};
+
+static void slip_pre_exec(void *arg)
+{
+        struct slip_pre_exec_data *data = arg;
+
+        if(data->stdin >= 0) dup2(data->stdin, 0);
+        dup2(data->stdout, 1);
+        if(data->close_me >= 0) os_close_file(data->close_me);
+}
+
+static int slip_tramp(char **argv, int fd)
+{
+        struct slip_pre_exec_data pe_data;
+        char *output;
+        int status, pid, fds[2], err, output_len;
+
+        err = os_pipe(fds, 1, 0);
+        if(err < 0){
+                printk("slip_tramp : pipe failed, err = %d\n", -err);
+                return(err);
+        }
+
+        err = 0;
+        pe_data.stdin = fd;
+        pe_data.stdout = fds[1];
+        pe_data.close_me = fds[0];
+        pid = run_helper(slip_pre_exec, &pe_data, argv, NULL);
+
+        if(pid < 0) err = pid;
+        else {
+                output_len = page_size();
+                output = um_kmalloc(output_len);
+                if(output == NULL)
+                        printk("slip_tramp : failed to allocate output "
+                               "buffer\n");
+
+                os_close_file(fds[1]);
+                read_output(fds[0], output, output_len);
+                if(output != NULL){
+                        printk("%s", output);
+                        kfree(output);
+                }
+                CATCH_EINTR(err = waitpid(pid, &status, 0));
+                if(err < 0)
+                        err = errno;
+                else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
+                        printk("'%s' didn't exit with status 0\n", argv[0]);
+                        err = -EINVAL;
+                }
+        }
+
+        os_close_file(fds[0]);
+
+        return(err);
+}
+
+static int slip_open(void *data)
+{
+        struct slip_data *pri = data;
+        char version_buf[sizeof("nnnnn\0")];
+        char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
+        char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf, 
+                         NULL };
+        int sfd, mfd, err;
+
+        mfd = get_pty();
+        if(mfd < 0){
+                printk("umn : Failed to open pty, err = %d\n", -mfd);
+                return(mfd);
+        }
+        sfd = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0);
+        if(sfd < 0){
+                printk("Couldn't open tty for slip line, err = %d\n", -sfd);
+                os_close_file(mfd);
+                return(sfd);
+        }
+        if(set_up_tty(sfd)) return(-1);
+        pri->slave = sfd;
+        pri->pos = 0;
+        pri->esc = 0;
+        if(pri->gate_addr != NULL){
+                sprintf(version_buf, "%d", UML_NET_VERSION);
+                strcpy(gate_buf, pri->gate_addr);
+
+                err = slip_tramp(argv, sfd);
+
+                if(err < 0){
+                        printk("slip_tramp failed - err = %d\n", -err);
+                        return(err);
+                }
+                err = os_get_ifname(pri->slave, pri->name);
+                if(err < 0){
+                        printk("get_ifname failed, err = %d\n", -err);
+                        return(err);
+                }
+                iter_addresses(pri->dev, open_addr, pri->name);
+        }
+        else {
+                err = os_set_slip(sfd);
+                if(err < 0){
+                        printk("Failed to set slip discipline encapsulation - "
+                               "err = %d\n", -err);
+                        return(err);
+                }
+        }
+        return(mfd);
+}
+
+static void slip_close(int fd, void *data)
+{
+        struct slip_data *pri = data;
+        char version_buf[sizeof("nnnnn\0")];
+        char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name, 
+                         NULL };
+        int err;
+
+        if(pri->gate_addr != NULL)
+                iter_addresses(pri->dev, close_addr, pri->name);
+
+        sprintf(version_buf, "%d", UML_NET_VERSION);
+
+        err = slip_tramp(argv, pri->slave);
+
+        if(err != 0)
+                printk("slip_tramp failed - errno = %d\n", -err);
+        os_close_file(fd);
+        os_close_file(pri->slave);
+        pri->slave = -1;
+}
+
+int slip_user_read(int fd, void *buf, int len, struct slip_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 slip_user_write(int fd, void *buf, int len, struct slip_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 slip_set_mtu(int mtu, void *data)
+{
+        return(mtu);
+}
+
+static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
+                          void *data)
+{
+        struct slip_data *pri = data;
+
+        if(pri->slave < 0) return;
+        open_addr(addr, netmask, pri->name);
+}
+
+static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
+                            void *data)
+{
+        struct slip_data *pri = data;
+
+        if(pri->slave < 0) return;
+        close_addr(addr, netmask, pri->name);
+}
+
+struct net_user_info slip_user_info = {
+        .init           = slip_user_init,
+        .open           = slip_open,
+        .close          = slip_close,
+        .remove         = NULL,
+        .set_mtu        = slip_set_mtu,
+        .add_address    = slip_add_addr,
+        .delete_address = slip_del_addr,
+        .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:
+ */