1 /* 2 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL. 4 */ 5 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <unistd.h> 9 #include <errno.h> 10 #include <fcntl.h> 11 #include <string.h> 12 #include <sys/termios.h> 13 #include <sys/wait.h> 14 #include "kern_constants.h" 15 #include "net_user.h" 16 #include "os.h" 17 #include "slip.h" 18 #include "um_malloc.h" 19 #include "user.h" 20 21 static int slip_user_init(void *data, void *dev) 22 { 23 struct slip_data *pri = data; 24 25 pri->dev = dev; 26 return 0; 27 } 28 29 static int set_up_tty(int fd) 30 { 31 int i; 32 struct termios tios; 33 34 if (tcgetattr(fd, &tios) < 0) { 35 printk(UM_KERN_ERR "could not get initial terminal " 36 "attributes\n"); 37 return -1; 38 } 39 40 tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL; 41 tios.c_iflag = IGNBRK | IGNPAR; 42 tios.c_oflag = 0; 43 tios.c_lflag = 0; 44 for (i = 0; i < NCCS; i++) 45 tios.c_cc[i] = 0; 46 tios.c_cc[VMIN] = 1; 47 tios.c_cc[VTIME] = 0; 48 49 cfsetospeed(&tios, B38400); 50 cfsetispeed(&tios, B38400); 51 52 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) { 53 printk(UM_KERN_ERR "failed to set terminal attributes\n"); 54 return -1; 55 } 56 return 0; 57 } 58 59 struct slip_pre_exec_data { 60 int stdin; 61 int stdout; 62 int close_me; 63 }; 64 65 static void slip_pre_exec(void *arg) 66 { 67 struct slip_pre_exec_data *data = arg; 68 69 if (data->stdin >= 0) 70 dup2(data->stdin, 0); 71 dup2(data->stdout, 1); 72 if (data->close_me >= 0) 73 close(data->close_me); 74 } 75 76 static int slip_tramp(char **argv, int fd) 77 { 78 struct slip_pre_exec_data pe_data; 79 char *output; 80 int pid, fds[2], err, output_len; 81 82 err = os_pipe(fds, 1, 0); 83 if (err < 0) { 84 printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n", 85 -err); 86 goto out; 87 } 88 89 err = 0; 90 pe_data.stdin = fd; 91 pe_data.stdout = fds[1]; 92 pe_data.close_me = fds[0]; 93 err = run_helper(slip_pre_exec, &pe_data, argv); 94 if (err < 0) 95 goto out_close; 96 pid = err; 97 98 output_len = UM_KERN_PAGE_SIZE; 99 output = uml_kmalloc(output_len, UM_GFP_KERNEL); 100 if (output == NULL) { 101 printk(UM_KERN_ERR "slip_tramp : failed to allocate output " 102 "buffer\n"); 103 os_kill_process(pid, 1); 104 err = -ENOMEM; 105 goto out_free; 106 } 107 108 close(fds[1]); 109 read_output(fds[0], output, output_len); 110 printk("%s", output); 111 112 err = helper_wait(pid); 113 close(fds[0]); 114 115 out_free: 116 kfree(output); 117 return err; 118 119 out_close: 120 close(fds[0]); 121 close(fds[1]); 122 out: 123 return err; 124 } 125 126 static int slip_open(void *data) 127 { 128 struct slip_data *pri = data; 129 char version_buf[sizeof("nnnnn\0")]; 130 char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")]; 131 char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf, 132 NULL }; 133 int sfd, mfd, err; 134 135 err = get_pty(); 136 if (err < 0) { 137 printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n", 138 -err); 139 goto out; 140 } 141 mfd = err; 142 143 err = open(ptsname(mfd), O_RDWR, 0); 144 if (err < 0) { 145 printk(UM_KERN_ERR "Couldn't open tty for slip line, " 146 "err = %d\n", -err); 147 goto out_close; 148 } 149 sfd = err; 150 151 if (set_up_tty(sfd)) 152 goto out_close2; 153 154 pri->slave = sfd; 155 pri->slip.pos = 0; 156 pri->slip.esc = 0; 157 if (pri->gate_addr != NULL) { 158 sprintf(version_buf, "%d", UML_NET_VERSION); 159 strcpy(gate_buf, pri->gate_addr); 160 161 err = slip_tramp(argv, sfd); 162 163 if (err < 0) { 164 printk(UM_KERN_ERR "slip_tramp failed - err = %d\n", 165 -err); 166 goto out_close2; 167 } 168 err = os_get_ifname(pri->slave, pri->name); 169 if (err < 0) { 170 printk(UM_KERN_ERR "get_ifname failed, err = %d\n", 171 -err); 172 goto out_close2; 173 } 174 iter_addresses(pri->dev, open_addr, pri->name); 175 } 176 else { 177 err = os_set_slip(sfd); 178 if (err < 0) { 179 printk(UM_KERN_ERR "Failed to set slip discipline " 180 "encapsulation - err = %d\n", -err); 181 goto out_close2; 182 } 183 } 184 return mfd; 185 out_close2: 186 close(sfd); 187 out_close: 188 close(mfd); 189 out: 190 return err; 191 } 192 193 static void slip_close(int fd, void *data) 194 { 195 struct slip_data *pri = data; 196 char version_buf[sizeof("nnnnn\0")]; 197 char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name, 198 NULL }; 199 int err; 200 201 if (pri->gate_addr != NULL) 202 iter_addresses(pri->dev, close_addr, pri->name); 203 204 sprintf(version_buf, "%d", UML_NET_VERSION); 205 206 err = slip_tramp(argv, pri->slave); 207 208 if (err != 0) 209 printk(UM_KERN_ERR "slip_tramp failed - errno = %d\n", -err); 210 close(fd); 211 close(pri->slave); 212 pri->slave = -1; 213 } 214 215 int slip_user_read(int fd, void *buf, int len, struct slip_data *pri) 216 { 217 return slip_proto_read(fd, buf, len, &pri->slip); 218 } 219 220 int slip_user_write(int fd, void *buf, int len, struct slip_data *pri) 221 { 222 return slip_proto_write(fd, buf, len, &pri->slip); 223 } 224 225 static void slip_add_addr(unsigned char *addr, unsigned char *netmask, 226 void *data) 227 { 228 struct slip_data *pri = data; 229 230 if (pri->slave < 0) 231 return; 232 open_addr(addr, netmask, pri->name); 233 } 234 235 static void slip_del_addr(unsigned char *addr, unsigned char *netmask, 236 void *data) 237 { 238 struct slip_data *pri = data; 239 240 if (pri->slave < 0) 241 return; 242 close_addr(addr, netmask, pri->name); 243 } 244 245 const struct net_user_info slip_user_info = { 246 .init = slip_user_init, 247 .open = slip_open, 248 .close = slip_close, 249 .remove = NULL, 250 .add_address = slip_add_addr, 251 .delete_address = slip_del_addr, 252 .mtu = BUF_SIZE, 253 .max_packet = BUF_SIZE, 254 }; 255