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215 lines
4.7 KiB
215 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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*/ |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <string.h> |
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#include <linux/if_tun.h> |
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#include <net/if.h> |
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#include <sys/ioctl.h> |
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#include <sys/socket.h> |
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#include <sys/wait.h> |
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#include <sys/uio.h> |
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#include <kern_util.h> |
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#include <os.h> |
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#include "tuntap.h" |
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static int tuntap_user_init(void *data, void *dev) |
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{ |
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struct tuntap_data *pri = data; |
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pri->dev = dev; |
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return 0; |
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} |
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static void tuntap_add_addr(unsigned char *addr, unsigned char *netmask, |
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void *data) |
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{ |
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struct tuntap_data *pri = data; |
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tap_check_ips(pri->gate_addr, addr); |
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if ((pri->fd == -1) || pri->fixed_config) |
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return; |
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open_addr(addr, netmask, pri->dev_name); |
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} |
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static void tuntap_del_addr(unsigned char *addr, unsigned char *netmask, |
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void *data) |
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{ |
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struct tuntap_data *pri = data; |
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if ((pri->fd == -1) || pri->fixed_config) |
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return; |
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close_addr(addr, netmask, pri->dev_name); |
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} |
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struct tuntap_pre_exec_data { |
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int stdout_fd; |
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int close_me; |
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}; |
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static void tuntap_pre_exec(void *arg) |
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{ |
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struct tuntap_pre_exec_data *data = arg; |
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dup2(data->stdout_fd, 1); |
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close(data->close_me); |
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} |
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static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote, |
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char *buffer, int buffer_len, int *used_out) |
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{ |
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struct tuntap_pre_exec_data data; |
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char version_buf[sizeof("nnnnn\0")]; |
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char *argv[] = { "uml_net", version_buf, "tuntap", "up", gate, |
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NULL }; |
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char buf[CMSG_SPACE(sizeof(*fd_out))]; |
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struct msghdr msg; |
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struct cmsghdr *cmsg; |
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struct iovec iov; |
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int pid, n, err; |
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sprintf(version_buf, "%d", UML_NET_VERSION); |
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data.stdout_fd = remote; |
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data.close_me = me; |
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pid = run_helper(tuntap_pre_exec, &data, argv); |
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if (pid < 0) |
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return pid; |
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close(remote); |
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msg.msg_name = NULL; |
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msg.msg_namelen = 0; |
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if (buffer != NULL) { |
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iov = ((struct iovec) { buffer, buffer_len }); |
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msg.msg_iov = &iov; |
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msg.msg_iovlen = 1; |
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} |
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else { |
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msg.msg_iov = NULL; |
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msg.msg_iovlen = 0; |
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} |
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msg.msg_control = buf; |
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msg.msg_controllen = sizeof(buf); |
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msg.msg_flags = 0; |
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n = recvmsg(me, &msg, 0); |
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*used_out = n; |
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if (n < 0) { |
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err = -errno; |
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printk(UM_KERN_ERR "tuntap_open_tramp : recvmsg failed - " |
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"errno = %d\n", errno); |
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return err; |
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} |
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helper_wait(pid); |
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cmsg = CMSG_FIRSTHDR(&msg); |
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if (cmsg == NULL) { |
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printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a " |
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"message\n"); |
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return -EINVAL; |
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} |
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if ((cmsg->cmsg_level != SOL_SOCKET) || |
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(cmsg->cmsg_type != SCM_RIGHTS)) { |
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printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a " |
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"descriptor\n"); |
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return -EINVAL; |
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} |
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*fd_out = ((int *) CMSG_DATA(cmsg))[0]; |
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os_set_exec_close(*fd_out); |
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return 0; |
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} |
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static int tuntap_open(void *data) |
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{ |
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struct ifreq ifr; |
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struct tuntap_data *pri = data; |
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char *output, *buffer; |
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int err, fds[2], len, used; |
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err = tap_open_common(pri->dev, pri->gate_addr); |
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if (err < 0) |
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return err; |
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if (pri->fixed_config) { |
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pri->fd = os_open_file("/dev/net/tun", |
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of_cloexec(of_rdwr(OPENFLAGS())), 0); |
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if (pri->fd < 0) { |
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printk(UM_KERN_ERR "Failed to open /dev/net/tun, " |
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"err = %d\n", -pri->fd); |
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return pri->fd; |
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} |
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memset(&ifr, 0, sizeof(ifr)); |
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
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strlcpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name)); |
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if (ioctl(pri->fd, TUNSETIFF, &ifr) < 0) { |
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err = -errno; |
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printk(UM_KERN_ERR "TUNSETIFF failed, errno = %d\n", |
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errno); |
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close(pri->fd); |
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return err; |
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} |
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} |
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else { |
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err = socketpair(AF_UNIX, SOCK_DGRAM, 0, fds); |
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if (err) { |
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err = -errno; |
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printk(UM_KERN_ERR "tuntap_open : socketpair failed - " |
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"errno = %d\n", errno); |
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return err; |
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} |
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buffer = get_output_buffer(&len); |
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if (buffer != NULL) |
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len--; |
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used = 0; |
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err = tuntap_open_tramp(pri->gate_addr, &pri->fd, fds[0], |
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fds[1], buffer, len, &used); |
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output = buffer; |
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if (err < 0) { |
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printk("%s", output); |
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free_output_buffer(buffer); |
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printk(UM_KERN_ERR "tuntap_open_tramp failed - " |
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"err = %d\n", -err); |
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return err; |
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} |
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pri->dev_name = uml_strdup(buffer); |
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output += IFNAMSIZ; |
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printk("%s", output); |
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free_output_buffer(buffer); |
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close(fds[0]); |
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iter_addresses(pri->dev, open_addr, pri->dev_name); |
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} |
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return pri->fd; |
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} |
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static void tuntap_close(int fd, void *data) |
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{ |
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struct tuntap_data *pri = data; |
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if (!pri->fixed_config) |
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iter_addresses(pri->dev, close_addr, pri->dev_name); |
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close(fd); |
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pri->fd = -1; |
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} |
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const struct net_user_info tuntap_user_info = { |
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.init = tuntap_user_init, |
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.open = tuntap_open, |
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.close = tuntap_close, |
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.remove = NULL, |
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.add_address = tuntap_add_addr, |
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.delete_address = tuntap_del_addr, |
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.mtu = ETH_MAX_PACKET, |
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.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER, |
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};
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