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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/os-Linux/drivers/ethertap_user.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/um/os-Linux/drivers/ethertap_user.c')
-rw-r--r-- | arch/um/os-Linux/drivers/ethertap_user.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/arch/um/os-Linux/drivers/ethertap_user.c b/arch/um/os-Linux/drivers/ethertap_user.c new file mode 100644 index 000000000..9483021d8 --- /dev/null +++ b/arch/um/os-Linux/drivers/ethertap_user.c @@ -0,0 +1,248 @@ +// 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, +}; 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