2 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
13 #include <sys/socket.h>
16 #include <sys/ioctl.h>
18 #include <linux/if_tun.h>
21 #include "kern_util.h"
26 #define MAX_PACKET ETH_MAX_PACKET
28 void tuntap_user_init(void *data, void *dev)
30 struct tuntap_data *pri = data;
35 static void tuntap_add_addr(unsigned char *addr, unsigned char *netmask,
38 struct tuntap_data *pri = data;
40 tap_check_ips(pri->gate_addr, addr);
41 if((pri->fd == -1) || pri->fixed_config) return;
42 open_addr(addr, netmask, pri->dev_name);
45 static void tuntap_del_addr(unsigned char *addr, unsigned char *netmask,
48 struct tuntap_data *pri = data;
50 if((pri->fd == -1) || pri->fixed_config) return;
51 close_addr(addr, netmask, pri->dev_name);
54 struct tuntap_pre_exec_data {
59 static void tuntap_pre_exec(void *arg)
61 struct tuntap_pre_exec_data *data = arg;
63 dup2(data->stdout, 1);
64 close(data->close_me);
67 static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
68 char *buffer, int buffer_len, int *used_out)
70 struct tuntap_pre_exec_data data;
71 char version_buf[sizeof("nnnnn\0")];
72 char *argv[] = { "uml_net", version_buf, "tuntap", "up", gate,
74 char buf[CMSG_SPACE(sizeof(*fd_out))];
80 sprintf(version_buf, "%d", UML_NET_VERSION);
85 pid = run_helper(tuntap_pre_exec, &data, argv, NULL);
87 if(pid < 0) return(-pid);
94 iov = ((struct iovec) { buffer, buffer_len });
102 msg.msg_control = buf;
103 msg.msg_controllen = sizeof(buf);
105 n = recvmsg(me, &msg, 0);
108 printk("tuntap_open_tramp : recvmsg failed - errno = %d\n",
112 waitpid(pid, NULL, 0);
114 cmsg = CMSG_FIRSTHDR(&msg);
116 printk("tuntap_open_tramp : didn't receive a message\n");
119 if((cmsg->cmsg_level != SOL_SOCKET) ||
120 (cmsg->cmsg_type != SCM_RIGHTS)){
121 printk("tuntap_open_tramp : didn't receive a descriptor\n");
124 *fd_out = ((int *) CMSG_DATA(cmsg))[0];
128 static int tuntap_open(void *data)
131 struct tuntap_data *pri = data;
132 char *output, *buffer;
133 int err, fds[2], len, used;
135 err = tap_open_common(pri->dev, pri->gate_addr);
138 if(pri->fixed_config){
139 if((pri->fd = open("/dev/net/tun", O_RDWR)) < 0){
140 printk("Failed to open /dev/net/tun, errno = %d\n",
144 memset(&ifr, 0, sizeof(ifr));
145 ifr.ifr_flags = IFF_TAP;
146 strlcpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
147 if(ioctl(pri->fd, TUNSETIFF, (void *) &ifr) < 0){
148 printk("TUNSETIFF failed, errno = %d", errno);
154 err = os_pipe(fds, 0, 0);
156 printk("tuntap_open : os_pipe failed - errno = %d\n",
161 buffer = get_output_buffer(&len);
162 if(buffer != NULL) len--;
165 err = tuntap_open_tramp(pri->gate_addr, &pri->fd, fds[0],
166 fds[1], buffer, len, &used);
170 pri->dev_name = uml_strdup(buffer);
173 free_output_buffer(buffer);
177 free_output_buffer(buffer);
178 printk("tuntap_open_tramp failed - errno = %d\n", err);
182 iter_addresses(pri->dev, open_addr, pri->dev_name);
188 static void tuntap_close(int fd, void *data)
190 struct tuntap_data *pri = data;
192 if(!pri->fixed_config)
193 iter_addresses(pri->dev, close_addr, pri->dev_name);
198 static int tuntap_set_mtu(int mtu, void *data)
203 struct net_user_info tuntap_user_info = {
204 .init = tuntap_user_init,
206 .close = tuntap_close,
208 .set_mtu = tuntap_set_mtu,
209 .add_address = tuntap_add_addr,
210 .delete_address = tuntap_del_addr,
211 .max_packet = MAX_PACKET
215 * Overrides for Emacs so that we follow Linus's tabbing style.
216 * Emacs will notice this stuff at the end of the file and automatically
217 * adjust the settings for this buffer only. This must remain at the end
219 * ---------------------------------------------------------------------------
221 * c-file-style: "linux"