2 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
3 * James Leu (jleu@mindspring.net).
4 * Copyright (C) 2001 by various other people who didn't put their name here.
5 * Licensed under the GPL.
12 #include <sys/errno.h>
13 #include <sys/socket.h>
18 #include "kern_util.h"
22 #include "um_malloc.h"
23 #include "kern_constants.h"
25 #define MAX_PACKET ETH_MAX_PACKET
27 static int etap_user_init(void *data, void *dev)
29 struct ethertap_data *pri = data;
36 enum { ADD_ADDR, DEL_ADDR } what;
37 unsigned char addr[4];
38 unsigned char netmask[4];
41 static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
44 struct addr_change change;
49 memcpy(change.addr, addr, sizeof(change.addr));
50 memcpy(change.netmask, netmask, sizeof(change.netmask));
51 CATCH_EINTR(n = write(fd, &change, sizeof(change)));
52 if(n != sizeof(change)){
53 printk("etap_change - request failed, err = %d\n", errno);
57 output = kmalloc(UM_KERN_PAGE_SIZE, UM_GFP_KERNEL);
59 printk("etap_change : Failed to allocate output buffer\n");
60 read_output(fd, output, UM_KERN_PAGE_SIZE);
67 static void etap_open_addr(unsigned char *addr, unsigned char *netmask,
70 etap_change(ADD_ADDR, addr, netmask, *((int *) arg));
73 static void etap_close_addr(unsigned char *addr, unsigned char *netmask,
76 etap_change(DEL_ADDR, addr, netmask, *((int *) arg));
79 struct etap_pre_exec_data {
85 static void etap_pre_exec(void *arg)
87 struct etap_pre_exec_data *data = arg;
89 dup2(data->control_remote, 1);
91 close(data->control_me);
94 static int etap_tramp(char *dev, char *gate, int control_me,
95 int control_remote, int data_me, int data_remote)
97 struct etap_pre_exec_data pe_data;
98 int pid, status, err, n;
99 char version_buf[sizeof("nnnnn\0")];
100 char data_fd_buf[sizeof("nnnnnn\0")];
101 char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
102 char *setup_args[] = { "uml_net", version_buf, "ethertap", dev,
103 data_fd_buf, gate_buf, NULL };
104 char *nosetup_args[] = { "uml_net", version_buf, "ethertap",
105 dev, data_fd_buf, NULL };
108 sprintf(data_fd_buf, "%d", data_remote);
109 sprintf(version_buf, "%d", UML_NET_VERSION);
111 strcpy(gate_buf, gate);
114 else args = nosetup_args;
117 pe_data.control_remote = control_remote;
118 pe_data.control_me = control_me;
119 pe_data.data_me = data_me;
120 pid = run_helper(etap_pre_exec, &pe_data, args);
125 close(control_remote);
126 CATCH_EINTR(n = read(control_me, &c, sizeof(c)));
129 printk("etap_tramp : read of status failed, err = %d\n", -err);
133 printk("etap_tramp : uml_net failed\n");
135 CATCH_EINTR(n = waitpid(pid, &status, 0));
138 else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 1))
139 printk("uml_net didn't exit with status 1\n");
144 static int etap_open(void *data)
146 struct ethertap_data *pri = data;
148 int data_fds[2], control_fds[2], err, output_len;
150 err = tap_open_common(pri->dev, pri->gate_addr);
154 err = socketpair(AF_UNIX, SOCK_DGRAM, 0, data_fds);
157 printk("etap_open - data socketpair failed - err = %d\n",
162 err = socketpair(AF_UNIX, SOCK_STREAM, 0, control_fds);
165 printk("etap_open - control socketpair failed - err = %d\n",
170 err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0],
171 control_fds[1], data_fds[0], data_fds[1]);
172 output_len = UM_KERN_PAGE_SIZE;
173 output = kmalloc(output_len, UM_GFP_KERNEL);
174 read_output(control_fds[0], output, output_len);
177 printk("etap_open : failed to allocate output buffer\n");
179 printk("%s", output);
184 printk("etap_tramp failed - err = %d\n", -err);
185 goto out_close_control;
188 pri->data_fd = data_fds[0];
189 pri->control_fd = control_fds[0];
190 iter_addresses(pri->dev, etap_open_addr, &pri->control_fd);
194 close(control_fds[0]);
195 close(control_fds[1]);
202 static void etap_close(int fd, void *data)
204 struct ethertap_data *pri = data;
206 iter_addresses(pri->dev, etap_close_addr, &pri->control_fd);
209 if(shutdown(pri->data_fd, SHUT_RDWR) < 0)
210 printk("etap_close - shutdown data socket failed, errno = %d\n",
213 if(shutdown(pri->control_fd, SHUT_RDWR) < 0)
214 printk("etap_close - shutdown control socket failed, "
215 "errno = %d\n", errno);
219 close(pri->control_fd);
220 pri->control_fd = -1;
223 static int etap_set_mtu(int mtu, void *data)
228 static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
231 struct ethertap_data *pri = data;
233 tap_check_ips(pri->gate_addr, addr);
234 if(pri->control_fd == -1)
236 etap_open_addr(addr, netmask, &pri->control_fd);
239 static void etap_del_addr(unsigned char *addr, unsigned char *netmask,
242 struct ethertap_data *pri = data;
244 if(pri->control_fd == -1)
247 etap_close_addr(addr, netmask, &pri->control_fd);
250 const struct net_user_info ethertap_user_info = {
251 .init = etap_user_init,
255 .set_mtu = etap_set_mtu,
256 .add_address = etap_add_addr,
257 .delete_address = etap_del_addr,
258 .max_packet = MAX_PACKET - ETH_HEADER_ETHERTAP