1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <unistd.h> 4 #include <stddef.h> 5 #include <sched.h> 6 #include <string.h> 7 #include <errno.h> 8 #include <sys/termios.h> 9 #include <sys/wait.h> 10 #include <sys/signal.h> 11 #include "kern_util.h" 12 #include "user.h" 13 #include "net_user.h" 14 #include "slip.h" 15 #include "slip_common.h" 16 #include "os.h" 17 #include "um_malloc.h" 18 #include "kern_constants.h" 19 20 static int slip_user_init(void *data, void *dev) 21 { 22 struct slip_data *pri = data; 23 24 pri->dev = dev; 25 return 0; 26 } 27 28 static int set_up_tty(int fd) 29 { 30 int i; 31 struct termios tios; 32 33 if (tcgetattr(fd, &tios) < 0) { 34 printk("could not get initial terminal attributes\n"); 35 return(-1); 36 } 37 38 tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL; 39 tios.c_iflag = IGNBRK | IGNPAR; 40 tios.c_oflag = 0; 41 tios.c_lflag = 0; 42 for (i = 0; i < NCCS; i++) 43 tios.c_cc[i] = 0; 44 tios.c_cc[VMIN] = 1; 45 tios.c_cc[VTIME] = 0; 46 47 cfsetospeed(&tios, B38400); 48 cfsetispeed(&tios, B38400); 49 50 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) { 51 printk("failed to set terminal attributes\n"); 52 return(-1); 53 } 54 return(0); 55 } 56 57 struct slip_pre_exec_data { 58 int stdin; 59 int stdout; 60 int close_me; 61 }; 62 63 static void slip_pre_exec(void *arg) 64 { 65 struct slip_pre_exec_data *data = arg; 66 67 if(data->stdin >= 0) dup2(data->stdin, 0); 68 dup2(data->stdout, 1); 69 if(data->close_me >= 0) os_close_file(data->close_me); 70 } 71 72 static int slip_tramp(char **argv, int fd) 73 { 74 struct slip_pre_exec_data pe_data; 75 char *output; 76 int status, pid, fds[2], err, output_len; 77 78 err = os_pipe(fds, 1, 0); 79 if(err < 0){ 80 printk("slip_tramp : pipe failed, err = %d\n", -err); 81 goto out; 82 } 83 84 err = 0; 85 pe_data.stdin = fd; 86 pe_data.stdout = fds[1]; 87 pe_data.close_me = fds[0]; 88 err = run_helper(slip_pre_exec, &pe_data, argv); 89 if(err < 0) 90 goto out_close; 91 pid = err; 92 93 output_len = UM_KERN_PAGE_SIZE; 94 output = kmalloc(output_len, UM_GFP_KERNEL); 95 if(output == NULL){ 96 printk("slip_tramp : failed to allocate output buffer\n"); 97 os_kill_process(pid, 1); 98 err = -ENOMEM; 99 goto out_free; 100 } 101 102 os_close_file(fds[1]); 103 read_output(fds[0], output, output_len); 104 printk("%s", output); 105 106 CATCH_EINTR(err = waitpid(pid, &status, 0)); 107 if(err < 0) 108 err = errno; 109 else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){ 110 printk("'%s' didn't exit with status 0\n", argv[0]); 111 err = -EINVAL; 112 } 113 else err = 0; 114 115 os_close_file(fds[0]); 116 117 out_free: 118 kfree(output); 119 return err; 120 121 out_close: 122 os_close_file(fds[0]); 123 os_close_file(fds[1]); 124 out: 125 return err; 126 } 127 128 static int slip_open(void *data) 129 { 130 struct slip_data *pri = data; 131 char version_buf[sizeof("nnnnn\0")]; 132 char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")]; 133 char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf, 134 NULL }; 135 int sfd, mfd, err; 136 137 err = get_pty(); 138 if(err < 0){ 139 printk("slip-open : Failed to open pty, err = %d\n", -err); 140 goto out; 141 } 142 mfd = err; 143 144 err = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0); 145 if(err < 0){ 146 printk("Couldn't open tty for slip line, 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("slip_tramp failed - err = %d\n", -err); 165 goto out_close2; 166 } 167 err = os_get_ifname(pri->slave, pri->name); 168 if(err < 0){ 169 printk("get_ifname failed, err = %d\n", -err); 170 goto out_close2; 171 } 172 iter_addresses(pri->dev, open_addr, pri->name); 173 } 174 else { 175 err = os_set_slip(sfd); 176 if(err < 0){ 177 printk("Failed to set slip discipline encapsulation - " 178 "err = %d\n", -err); 179 goto out_close2; 180 } 181 } 182 return(mfd); 183 out_close2: 184 os_close_file(sfd); 185 out_close: 186 os_close_file(mfd); 187 out: 188 return err; 189 } 190 191 static void slip_close(int fd, void *data) 192 { 193 struct slip_data *pri = data; 194 char version_buf[sizeof("nnnnn\0")]; 195 char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name, 196 NULL }; 197 int err; 198 199 if(pri->gate_addr != NULL) 200 iter_addresses(pri->dev, close_addr, pri->name); 201 202 sprintf(version_buf, "%d", UML_NET_VERSION); 203 204 err = slip_tramp(argv, pri->slave); 205 206 if(err != 0) 207 printk("slip_tramp failed - errno = %d\n", -err); 208 os_close_file(fd); 209 os_close_file(pri->slave); 210 pri->slave = -1; 211 } 212 213 int slip_user_read(int fd, void *buf, int len, struct slip_data *pri) 214 { 215 return slip_proto_read(fd, buf, len, &pri->slip); 216 } 217 218 int slip_user_write(int fd, void *buf, int len, struct slip_data *pri) 219 { 220 return slip_proto_write(fd, buf, len, &pri->slip); 221 } 222 223 static int slip_set_mtu(int mtu, void *data) 224 { 225 return(mtu); 226 } 227 228 static void slip_add_addr(unsigned char *addr, unsigned char *netmask, 229 void *data) 230 { 231 struct slip_data *pri = data; 232 233 if(pri->slave < 0) return; 234 open_addr(addr, netmask, pri->name); 235 } 236 237 static void slip_del_addr(unsigned char *addr, unsigned char *netmask, 238 void *data) 239 { 240 struct slip_data *pri = data; 241 242 if(pri->slave < 0) return; 243 close_addr(addr, netmask, pri->name); 244 } 245 246 const struct net_user_info slip_user_info = { 247 .init = slip_user_init, 248 .open = slip_open, 249 .close = slip_close, 250 .remove = NULL, 251 .set_mtu = slip_set_mtu, 252 .add_address = slip_add_addr, 253 .delete_address = slip_del_addr, 254 .max_packet = BUF_SIZE 255 }; 256