![Jeff Dike](/assets/img/avatar_default.png)
Reintroduce uml_kmalloc for the benefit of UML libc code. The previous tactic of declaring __kmalloc so it could be called directly from the libc side of the house turned out to be getting too intimate with slab, and it doesn't work with slob. So, the uml_kmalloc wrapper is back. It calls kmalloc or whatever that translates into, and libc code calls it. kfree is left alone since that still works, leaving a somewhat inconsistent API. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
251 lines
5.9 KiB
C
251 lines
5.9 KiB
C
/*
|
|
* 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.
|
|
* Licensed under the GPL.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/wait.h>
|
|
#include "etap.h"
|
|
#include "kern_constants.h"
|
|
#include "os.h"
|
|
#include "net_user.h"
|
|
#include "um_malloc.h"
|
|
#include "user.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) {
|
|
strcpy(gate_buf, gate);
|
|
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,
|
|
};
|