Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
 * James Leu (jleu@mindspring.net).
 * Copyright (C) 2001 by various other people who didn't put their name here.
 */
 
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include "etap.h"
#include <os.h>
#include <net_user.h>
#include <um_malloc.h>
 
#define MAX_PACKET ETH_MAX_PACKET
 
static int etap_user_init(void *data, void *dev)
{
<------>struct ethertap_data *pri = data;
 
<------>pri->dev = dev;
<------>return 0;
}
 
struct addr_change {
<------>enum { ADD_ADDR, DEL_ADDR } what;
<------>unsigned char addr[4];
<------>unsigned char netmask[4];
};
 
static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
<------><------><------>int fd)
{
<------>struct addr_change change;
<------>char *output;
<------>int n;
 
<------>change.what = op;
<------>memcpy(change.addr, addr, sizeof(change.addr));
<------>memcpy(change.netmask, netmask, sizeof(change.netmask));
<------>CATCH_EINTR(n = write(fd, &change, sizeof(change)));
<------>if (n != sizeof(change)) {
<------><------>printk(UM_KERN_ERR "etap_change - request failed, err = %d\n",
<------><------>       errno);
<------><------>return;
<------>}
 
<------>output = uml_kmalloc(UM_KERN_PAGE_SIZE, UM_GFP_KERNEL);
<------>if (output == NULL)
<------><------>printk(UM_KERN_ERR "etap_change : Failed to allocate output "
<------><------>       "buffer\n");
<------>read_output(fd, output, UM_KERN_PAGE_SIZE);
<------>if (output != NULL) {
<------><------>printk("%s", output);
<------><------>kfree(output);
<------>}
}
 
static void etap_open_addr(unsigned char *addr, unsigned char *netmask,
<------><------><------>   void *arg)
{
<------>etap_change(ADD_ADDR, addr, netmask, *((int *) arg));
}
 
static void etap_close_addr(unsigned char *addr, unsigned char *netmask,
<------><------><------>    void *arg)
{
<------>etap_change(DEL_ADDR, addr, netmask, *((int *) arg));
}
 
struct etap_pre_exec_data {
<------>int control_remote;
<------>int control_me;
<------>int data_me;
};
 
static void etap_pre_exec(void *arg)
{
<------>struct etap_pre_exec_data *data = arg;
 
<------>dup2(data->control_remote, 1);
<------>close(data->data_me);
<------>close(data->control_me);
}
 
static int etap_tramp(char *dev, char *gate, int control_me,
<------><------>      int control_remote, int data_me, int data_remote)
{
<------>struct etap_pre_exec_data pe_data;
<------>int pid, err, n;
<------>char version_buf[sizeof("nnnnn\0")];
<------>char data_fd_buf[sizeof("nnnnnn\0")];
<------>char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
<------>char *setup_args[] = { "uml_net", version_buf, "ethertap", dev,
<------><------><------>       data_fd_buf, gate_buf, NULL };
<------>char *nosetup_args[] = { "uml_net", version_buf, "ethertap",
<------><------><------><------> dev, data_fd_buf, NULL };
<------>char **args, c;
 
<------>sprintf(data_fd_buf, "%d", data_remote);
<------>sprintf(version_buf, "%d", UML_NET_VERSION);
<------>if (gate != NULL) {
<------><------>strncpy(gate_buf, gate, 15);
<------><------>args = setup_args;
<------>}
<------>else args = nosetup_args;
 
<------>err = 0;
<------>pe_data.control_remote = control_remote;
<------>pe_data.control_me = control_me;
<------>pe_data.data_me = data_me;
<------>pid = run_helper(etap_pre_exec, &pe_data, args);
 
<------>if (pid < 0)
<------><------>err = pid;
<------>close(data_remote);
<------>close(control_remote);
<------>CATCH_EINTR(n = read(control_me, &c, sizeof(c)));
<------>if (n != sizeof(c)) {
<------><------>err = -errno;
<------><------>printk(UM_KERN_ERR "etap_tramp : read of status failed, "
<------><------>       "err = %d\n", -err);
<------><------>return err;
<------>}
<------>if (c != 1) {
<------><------>printk(UM_KERN_ERR "etap_tramp : uml_net failed\n");
<------><------>err = helper_wait(pid);
<------>}
<------>return err;
}
 
static int etap_open(void *data)
{
<------>struct ethertap_data *pri = data;
<------>char *output;
<------>int data_fds[2], control_fds[2], err, output_len;
 
<------>err = tap_open_common(pri->dev, pri->gate_addr);
<------>if (err)
<------><------>return err;
 
<------>err = socketpair(AF_UNIX, SOCK_DGRAM, 0, data_fds);
<------>if (err) {
<------><------>err = -errno;
<------><------>printk(UM_KERN_ERR "etap_open - data socketpair failed - "
<------><------>       "err = %d\n", errno);
<------><------>return err;
<------>}
 
<------>err = socketpair(AF_UNIX, SOCK_STREAM, 0, control_fds);
<------>if (err) {
<------><------>err = -errno;
<------><------>printk(UM_KERN_ERR "etap_open - control socketpair failed - "
<------><------>       "err = %d\n", errno);
<------><------>goto out_close_data;
<------>}
 
<------>err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0],
<------><------><------> control_fds[1], data_fds[0], data_fds[1]);
<------>output_len = UM_KERN_PAGE_SIZE;
<------>output = uml_kmalloc(output_len, UM_GFP_KERNEL);
<------>read_output(control_fds[0], output, output_len);
 
<------>if (output == NULL)
<------><------>printk(UM_KERN_ERR "etap_open : failed to allocate output "
<------><------>       "buffer\n");
<------>else {
<------><------>printk("%s", output);
<------><------>kfree(output);
<------>}
 
<------>if (err < 0) {
<------><------>printk(UM_KERN_ERR "etap_tramp failed - err = %d\n", -err);
<------><------>goto out_close_control;
<------>}
 
<------>pri->data_fd = data_fds[0];
<------>pri->control_fd = control_fds[0];
<------>iter_addresses(pri->dev, etap_open_addr, &pri->control_fd);
<------>return data_fds[0];
 
out_close_control:
<------>close(control_fds[0]);
<------>close(control_fds[1]);
out_close_data:
<------>close(data_fds[0]);
<------>close(data_fds[1]);
<------>return err;
}
 
static void etap_close(int fd, void *data)
{
<------>struct ethertap_data *pri = data;
 
<------>iter_addresses(pri->dev, etap_close_addr, &pri->control_fd);
<------>close(fd);
 
<------>if (shutdown(pri->data_fd, SHUT_RDWR) < 0)
<------><------>printk(UM_KERN_ERR "etap_close - shutdown data socket failed, "
<------><------>       "errno = %d\n", errno);
 
<------>if (shutdown(pri->control_fd, SHUT_RDWR) < 0)
<------><------>printk(UM_KERN_ERR "etap_close - shutdown control socket "
<------><------>       "failed, errno = %d\n", errno);
 
<------>close(pri->data_fd);
<------>pri->data_fd = -1;
<------>close(pri->control_fd);
<------>pri->control_fd = -1;
}
 
static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
<------><------><------>  void *data)
{
<------>struct ethertap_data *pri = data;
 
<------>tap_check_ips(pri->gate_addr, addr);
<------>if (pri->control_fd == -1)
<------><------>return;
<------>etap_open_addr(addr, netmask, &pri->control_fd);
}
 
static void etap_del_addr(unsigned char *addr, unsigned char *netmask,
<------><------><------>  void *data)
{
<------>struct ethertap_data *pri = data;
 
<------>if (pri->control_fd == -1)
<------><------>return;
 
<------>etap_close_addr(addr, netmask, &pri->control_fd);
}
 
const struct net_user_info ethertap_user_info = {
<------>.init		= etap_user_init,
<------>.open		= etap_open,
<------>.close	 	= etap_close,
<------>.remove	 	= NULL,
<------>.add_address	= etap_add_addr,
<------>.delete_address = etap_del_addr,
<------>.mtu		= ETH_MAX_PACKET,
<------>.max_packet	= ETH_MAX_PACKET + ETH_HEADER_ETHERTAP,
};