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.
13 #include <sys/errno.h>
14 #include <sys/socket.h>
19 #include "kern_util.h"
25 #define MAX_PACKET ETH_MAX_PACKET
27 void etap_user_init(void *data, void *dev)
29 struct ethertap_data *pri = data;
35 enum { ADD_ADDR, DEL_ADDR } what;
36 unsigned char addr[4];
37 unsigned char netmask[4];
40 static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
43 struct addr_change change;
47 memcpy(change.addr, addr, sizeof(change.addr));
48 memcpy(change.netmask, netmask, sizeof(change.netmask));
49 if(write(fd, &change, sizeof(change)) != sizeof(change))
50 printk("etap_change - request failed, errno = %d\n",
52 output = um_kmalloc(page_size());
54 printk("etap_change : Failed to allocate output buffer\n");
55 read_output(fd, output, page_size());
62 static void etap_open_addr(unsigned char *addr, unsigned char *netmask,
65 etap_change(ADD_ADDR, addr, netmask, *((int *) arg));
68 static void etap_close_addr(unsigned char *addr, unsigned char *netmask,
71 etap_change(DEL_ADDR, addr, netmask, *((int *) arg));
74 struct etap_pre_exec_data {
80 static void etap_pre_exec(void *arg)
82 struct etap_pre_exec_data *data = arg;
84 dup2(data->control_remote, 1);
86 close(data->control_me);
89 static int etap_tramp(char *dev, char *gate, int control_me,
90 int control_remote, int data_me, int data_remote)
92 struct etap_pre_exec_data pe_data;
94 char version_buf[sizeof("nnnnn\0")];
95 char data_fd_buf[sizeof("nnnnnn\0")];
96 char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
97 char *setup_args[] = { "uml_net", version_buf, "ethertap", dev,
98 data_fd_buf, gate_buf, NULL };
99 char *nosetup_args[] = { "uml_net", version_buf, "ethertap",
100 dev, data_fd_buf, NULL };
103 sprintf(data_fd_buf, "%d", data_remote);
104 sprintf(version_buf, "%d", UML_NET_VERSION);
106 strcpy(gate_buf, gate);
109 else args = nosetup_args;
112 pe_data.control_remote = control_remote;
113 pe_data.control_me = control_me;
114 pe_data.data_me = data_me;
115 pid = run_helper(etap_pre_exec, &pe_data, args, NULL);
117 if(pid < 0) err = errno;
119 close(control_remote);
120 if(read(control_me, &c, sizeof(c)) != sizeof(c)){
121 printk("etap_tramp : read of status failed, errno = %d\n",
126 printk("etap_tramp : uml_net failed\n");
128 if(waitpid(pid, &status, 0) < 0) err = errno;
129 else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 1)){
130 printk("uml_net didn't exit with status 1\n");
136 static int etap_open(void *data)
138 struct ethertap_data *pri = data;
140 int data_fds[2], control_fds[2], err, output_len;
142 err = tap_open_common(pri->dev, pri->gate_addr);
145 err = os_pipe(data_fds, 0, 0);
147 printk("data os_pipe failed - errno = %d\n", -err);
151 err = os_pipe(control_fds, 1, 0);
153 printk("control os_pipe failed - errno = %d\n", -err);
157 err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0],
158 control_fds[1], data_fds[0], data_fds[1]);
159 output_len = page_size();
160 output = um_kmalloc(output_len);
161 read_output(control_fds[0], output, output_len);
164 printk("etap_open : failed to allocate output buffer\n");
166 printk("%s", output);
171 printk("etap_tramp failed - errno = %d\n", err);
175 pri->data_fd = data_fds[0];
176 pri->control_fd = control_fds[0];
177 iter_addresses(pri->dev, etap_open_addr, &pri->control_fd);
181 static void etap_close(int fd, void *data)
183 struct ethertap_data *pri = data;
185 iter_addresses(pri->dev, etap_close_addr, &pri->control_fd);
187 os_shutdown_socket(pri->data_fd, 1, 1);
190 close(pri->control_fd);
191 pri->control_fd = -1;
194 static int etap_set_mtu(int mtu, void *data)
199 static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
202 struct ethertap_data *pri = data;
204 tap_check_ips(pri->gate_addr, addr);
205 if(pri->control_fd == -1) return;
206 etap_open_addr(addr, netmask, &pri->control_fd);
209 static void etap_del_addr(unsigned char *addr, unsigned char *netmask,
212 struct ethertap_data *pri = data;
214 if(pri->control_fd == -1) return;
215 etap_close_addr(addr, netmask, &pri->control_fd);
218 struct net_user_info ethertap_user_info = {
219 .init = etap_user_init,
223 .set_mtu = etap_set_mtu,
224 .add_address = etap_add_addr,
225 .delete_address = etap_del_addr,
226 .max_packet = MAX_PACKET - ETH_HEADER_ETHERTAP
230 * Overrides for Emacs so that we follow Linus's tabbing style.
231 * Emacs will notice this stuff at the end of the file and automatically
232 * adjust the settings for this buffer only. This must remain at the end
234 * ---------------------------------------------------------------------------
236 * c-file-style: "linux"