Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 215 insertions, 0 deletions

diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c
new file mode 100644
index 000000000..db24ce0d0
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap_user.c
@@ -0,0 +1,215 @@
+/* 
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <linux/if_tun.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <kern_util.h>
+#include <os.h>
+#include "tuntap.h"
+
+static int tuntap_user_init(void *data, void *dev)
+{
+	struct tuntap_data *pri = data;
+
+	pri->dev = dev;
+	return 0;
+}
+
+static void tuntap_add_addr(unsigned char *addr, unsigned char *netmask,
+			    void *data)
+{
+	struct tuntap_data *pri = data;
+
+	tap_check_ips(pri->gate_addr, addr);
+	if ((pri->fd == -1) || pri->fixed_config)
+		return;
+	open_addr(addr, netmask, pri->dev_name);
+}
+
+static void tuntap_del_addr(unsigned char *addr, unsigned char *netmask,
+			    void *data)
+{
+	struct tuntap_data *pri = data;
+
+	if ((pri->fd == -1) || pri->fixed_config)
+		return;
+	close_addr(addr, netmask, pri->dev_name);
+}
+
+struct tuntap_pre_exec_data {
+	int stdout_fd;
+	int close_me;
+};
+
+static void tuntap_pre_exec(void *arg)
+{
+	struct tuntap_pre_exec_data *data = arg;
+
+	dup2(data->stdout_fd, 1);
+	close(data->close_me);
+}
+
+static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
+			     char *buffer, int buffer_len, int *used_out)
+{
+	struct tuntap_pre_exec_data data;
+	char version_buf[sizeof("nnnnn\0")];
+	char *argv[] = { "uml_net", version_buf, "tuntap", "up", gate,
+			 NULL };
+	char buf[CMSG_SPACE(sizeof(*fd_out))];
+	struct msghdr msg;
+	struct cmsghdr *cmsg;
+	struct iovec iov;
+	int pid, n, err;
+
+	sprintf(version_buf, "%d", UML_NET_VERSION);
+
+	data.stdout_fd = remote;
+	data.close_me = me;
+
+	pid = run_helper(tuntap_pre_exec, &data, argv);
+
+	if (pid < 0)
+		return pid;
+
+	close(remote);
+
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	if (buffer != NULL) {
+		iov = ((struct iovec) { buffer, buffer_len });
+		msg.msg_iov = &iov;
+		msg.msg_iovlen = 1;
+	}
+	else {
+		msg.msg_iov = NULL;
+		msg.msg_iovlen = 0;
+	}
+	msg.msg_control = buf;
+	msg.msg_controllen = sizeof(buf);
+	msg.msg_flags = 0;
+	n = recvmsg(me, &msg, 0);
+	*used_out = n;
+	if (n < 0) {
+		err = -errno;
+		printk(UM_KERN_ERR "tuntap_open_tramp : recvmsg failed - "
+		       "errno = %d\n", errno);
+		return err;
+	}
+	helper_wait(pid);
+
+	cmsg = CMSG_FIRSTHDR(&msg);
+	if (cmsg == NULL) {
+		printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a "
+		       "message\n");
+		return -EINVAL;
+	}
+	if ((cmsg->cmsg_level != SOL_SOCKET) ||
+	   (cmsg->cmsg_type != SCM_RIGHTS)) {
+		printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a "
+		       "descriptor\n");
+		return -EINVAL;
+	}
+	*fd_out = ((int *) CMSG_DATA(cmsg))[0];
+	os_set_exec_close(*fd_out);
+	return 0;
+}
+
+static int tuntap_open(void *data)
+{
+	struct ifreq ifr;
+	struct tuntap_data *pri = data;
+	char *output, *buffer;
+	int err, fds[2], len, used;
+
+	err = tap_open_common(pri->dev, pri->gate_addr);
+	if (err < 0)
+		return err;
+
+	if (pri->fixed_config) {
+		pri->fd = os_open_file("/dev/net/tun",
+				       of_cloexec(of_rdwr(OPENFLAGS())), 0);
+		if (pri->fd < 0) {
+			printk(UM_KERN_ERR "Failed to open /dev/net/tun, "
+			       "err = %d\n", -pri->fd);
+			return pri->fd;
+		}
+		memset(&ifr, 0, sizeof(ifr));
+		ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+		strlcpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
+		if (ioctl(pri->fd, TUNSETIFF, &ifr) < 0) {
+			err = -errno;
+			printk(UM_KERN_ERR "TUNSETIFF failed, errno = %d\n",
+			       errno);
+			close(pri->fd);
+			return err;
+		}
+	}
+	else {
+		err = socketpair(AF_UNIX, SOCK_DGRAM, 0, fds);
+		if (err) {
+			err = -errno;
+			printk(UM_KERN_ERR "tuntap_open : socketpair failed - "
+			       "errno = %d\n", errno);
+			return err;
+		}
+
+		buffer = get_output_buffer(&len);
+		if (buffer != NULL)
+			len--;
+		used = 0;
+
+		err = tuntap_open_tramp(pri->gate_addr, &pri->fd, fds[0],
+					fds[1], buffer, len, &used);
+
+		output = buffer;
+		if (err < 0) {
+			printk("%s", output);
+			free_output_buffer(buffer);
+			printk(UM_KERN_ERR "tuntap_open_tramp failed - "
+			       "err = %d\n", -err);
+			return err;
+		}
+
+		pri->dev_name = uml_strdup(buffer);
+		output += IFNAMSIZ;
+		printk("%s", output);
+		free_output_buffer(buffer);
+
+		close(fds[0]);
+		iter_addresses(pri->dev, open_addr, pri->dev_name);
+	}
+
+	return pri->fd;
+}
+
+static void tuntap_close(int fd, void *data)
+{
+	struct tuntap_data *pri = data;
+
+	if (!pri->fixed_config)
+		iter_addresses(pri->dev, close_addr, pri->dev_name);
+	close(fd);
+	pri->fd = -1;
+}
+
+const struct net_user_info tuntap_user_info = {
+	.init		= tuntap_user_init,
+	.open		= tuntap_open,
+	.close	 	= tuntap_close,
+	.remove	 	= NULL,
+	.add_address	= tuntap_add_addr,
+	.delete_address = tuntap_del_addr,
+	.mtu		= ETH_MAX_PACKET,
+	.max_packet	= ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};