1 | /* |
---|
2 | * sys-bsd.c - System-dependent procedures for setting up |
---|
3 | * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.) |
---|
4 | * |
---|
5 | * Copyright (c) 1989 Carnegie Mellon University. |
---|
6 | * Copyright (c) 1995 The Australian National University. |
---|
7 | * All rights reserved. |
---|
8 | * |
---|
9 | * Redistribution and use in source and binary forms are permitted |
---|
10 | * provided that the above copyright notice and this paragraph are |
---|
11 | * duplicated in all such forms and that any documentation, |
---|
12 | * advertising materials, and other materials related to such |
---|
13 | * distribution and use acknowledge that the software was developed |
---|
14 | * by Carnegie Mellon University and The Australian National University. |
---|
15 | * The names of the Universities may not be used to endorse or promote |
---|
16 | * products derived from this software without specific prior written |
---|
17 | * permission. |
---|
18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
---|
19 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
---|
20 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
---|
21 | */ |
---|
22 | |
---|
23 | #include <stdio.h> |
---|
24 | #include <string.h> |
---|
25 | #include <stdlib.h> |
---|
26 | #include <unistd.h> |
---|
27 | #include <errno.h> |
---|
28 | #include <fcntl.h> |
---|
29 | #include <termios.h> |
---|
30 | #include <signal.h> |
---|
31 | #include <sys/ioctl.h> |
---|
32 | #include <sys/types.h> |
---|
33 | #include <sys/socket.h> |
---|
34 | #include <sys/time.h> |
---|
35 | #include <sys/stat.h> |
---|
36 | #include <sys/param.h> |
---|
37 | #ifdef PPP_FILTER |
---|
38 | #include <net/bpf.h> |
---|
39 | #endif |
---|
40 | |
---|
41 | #include <net/if.h> |
---|
42 | #include <net/ppp_defs.h> |
---|
43 | #include <net/if_ppp.h> |
---|
44 | #include <net/route.h> |
---|
45 | #include <net/if_dl.h> |
---|
46 | #include <netinet/in.h> |
---|
47 | |
---|
48 | #if RTM_VERSION >= 3 |
---|
49 | #include <sys/param.h> |
---|
50 | #if defined(NetBSD) && (NetBSD >= 199703) |
---|
51 | #include <netinet/if_inarp.h> |
---|
52 | #else /* NetBSD 1.2D or later */ |
---|
53 | #include <netinet/if_ether.h> |
---|
54 | #endif |
---|
55 | #endif |
---|
56 | |
---|
57 | #include <rtems.h> |
---|
58 | #include <rtems/rtems_bsdnet.h> |
---|
59 | #include <rtems/termiostypes.h> |
---|
60 | extern int rtems_bsdnet_microseconds_per_tick; |
---|
61 | extern rtems_id rtems_pppd_taskid; |
---|
62 | |
---|
63 | #include "pppd.h" |
---|
64 | #include "fsm.h" |
---|
65 | #include "ipcp.h" |
---|
66 | |
---|
67 | static int initdisc = -1; /* Initial TTY discipline for ppp_fd */ |
---|
68 | static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */ |
---|
69 | static int ppp_fd = -1; /* fd which is set to PPP discipline */ |
---|
70 | static int rtm_seq; |
---|
71 | |
---|
72 | static int restore_term; /* 1 => we've munged the terminal */ |
---|
73 | static struct termios inittermios; /* Initial TTY termios */ |
---|
74 | static struct winsize wsinfo; /* Initial window size info */ |
---|
75 | |
---|
76 | static int loop_slave = -1; |
---|
77 | static int loop_master; |
---|
78 | |
---|
79 | static unsigned char inbuf[512]; /* buffer for chars read from loopback */ |
---|
80 | |
---|
81 | static int sockfd; /* socket for doing interface ioctls */ |
---|
82 | |
---|
83 | static int if_is_up; /* the interface is currently up */ |
---|
84 | static uint32_t ifaddrs[2]; /* local and remote addresses we set */ |
---|
85 | static uint32_t default_route_gateway; /* gateway addr for default route */ |
---|
86 | static uint32_t proxy_arp_addr; /* remote addr for proxy arp */ |
---|
87 | |
---|
88 | /* Prototypes for procedures local to this file. */ |
---|
89 | static int dodefaultroute(uint32_t, int); |
---|
90 | static int get_ether_addr(uint32_t, struct sockaddr_dl *); |
---|
91 | |
---|
92 | |
---|
93 | /* |
---|
94 | * sys_init - System-dependent initialization. |
---|
95 | */ |
---|
96 | void |
---|
97 | sys_init(void) |
---|
98 | { |
---|
99 | /* Get an internet socket for doing socket ioctl's on. */ |
---|
100 | if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
---|
101 | fatal("Couldn't create IP socket: %m"); |
---|
102 | } |
---|
103 | |
---|
104 | /* |
---|
105 | * sys_cleanup - restore any system state we modified before exiting: |
---|
106 | * mark the interface down, delete default route and/or proxy arp entry. |
---|
107 | * This should call die() because it's called from die(). |
---|
108 | */ |
---|
109 | void |
---|
110 | sys_cleanup(void) |
---|
111 | { |
---|
112 | struct ifreq ifr; |
---|
113 | |
---|
114 | if (if_is_up) { |
---|
115 | strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
---|
116 | if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0 |
---|
117 | && ((ifr.ifr_flags & IFF_UP) != 0)) { |
---|
118 | ifr.ifr_flags &= ~IFF_UP; |
---|
119 | ioctl(sockfd, SIOCSIFFLAGS, &ifr); |
---|
120 | } |
---|
121 | } |
---|
122 | if (ifaddrs[0] != 0) |
---|
123 | cifaddr(0, ifaddrs[0], ifaddrs[1]); |
---|
124 | if (default_route_gateway) |
---|
125 | cifdefaultroute(0, 0, default_route_gateway); |
---|
126 | if (proxy_arp_addr) |
---|
127 | cifproxyarp(0, proxy_arp_addr); |
---|
128 | } |
---|
129 | |
---|
130 | /* |
---|
131 | * sys_close - Clean up in a child process before execing. |
---|
132 | */ |
---|
133 | void |
---|
134 | sys_close(void) |
---|
135 | { |
---|
136 | close(sockfd); |
---|
137 | if (loop_slave >= 0) { |
---|
138 | close(loop_slave); |
---|
139 | close(loop_master); |
---|
140 | } |
---|
141 | } |
---|
142 | |
---|
143 | /* |
---|
144 | * sys_check_options - check the options that the user specified |
---|
145 | */ |
---|
146 | int |
---|
147 | sys_check_options(void) |
---|
148 | { |
---|
149 | return 1; |
---|
150 | } |
---|
151 | |
---|
152 | /* |
---|
153 | * ppp_available - check whether the system has any ppp interfaces |
---|
154 | * (in fact we check whether we can do an ioctl on ppp0). |
---|
155 | */ |
---|
156 | int |
---|
157 | ppp_available(void) |
---|
158 | { |
---|
159 | int s, ok; |
---|
160 | struct ifreq ifr; |
---|
161 | |
---|
162 | if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
---|
163 | return 1; /* can't tell */ |
---|
164 | |
---|
165 | strlcpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); |
---|
166 | ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0; |
---|
167 | close(s); |
---|
168 | |
---|
169 | return ok; |
---|
170 | } |
---|
171 | |
---|
172 | /* |
---|
173 | * establish_ppp - Turn the serial port into a ppp interface. |
---|
174 | */ |
---|
175 | int |
---|
176 | establish_ppp( |
---|
177 | int fd) |
---|
178 | { |
---|
179 | int taskid = (int)rtems_pppd_taskid; |
---|
180 | int pppdisc = PPPDISC; |
---|
181 | int x; |
---|
182 | |
---|
183 | if (demand) { |
---|
184 | /* |
---|
185 | * Demand mode - prime the old ppp device to relinquish the unit. |
---|
186 | */ |
---|
187 | if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) |
---|
188 | fatal("ioctl(transfer ppp unit): %m"); |
---|
189 | } |
---|
190 | |
---|
191 | /* |
---|
192 | * Save the old line discipline of fd, and set it to PPP. |
---|
193 | */ |
---|
194 | if (ioctl(fd, TIOCGETD, &initdisc) < 0) |
---|
195 | fatal("ioctl(TIOCGETD): %m"); |
---|
196 | if (ioctl(fd, TIOCSETD, &pppdisc) < 0) |
---|
197 | fatal("ioctl(TIOCSETD): %m"); |
---|
198 | |
---|
199 | /* set pppd taskid into the driver */ |
---|
200 | ioctl(fd, PPPIOCSTASK, &taskid); |
---|
201 | |
---|
202 | if (!demand) { |
---|
203 | /* |
---|
204 | * Find out which interface we were given. |
---|
205 | */ |
---|
206 | if (ioctl(fd, PPPIOCGUNIT, &pppifunit) < 0) |
---|
207 | fatal("ioctl(PPPIOCGUNIT): %m"); |
---|
208 | } else { |
---|
209 | /* |
---|
210 | * Check that we got the same unit again. |
---|
211 | */ |
---|
212 | if (ioctl(fd, PPPIOCGUNIT, &x) < 0) |
---|
213 | fatal("ioctl(PPPIOCGUNIT): %m"); |
---|
214 | if (x != pppifunit) |
---|
215 | fatal("transfer_ppp failed: wanted unit %d, got %d", pppifunit, x); |
---|
216 | x = TTYDISC; |
---|
217 | ioctl(loop_slave, TIOCSETD, &x); |
---|
218 | } |
---|
219 | |
---|
220 | ppp_fd = fd; |
---|
221 | |
---|
222 | /* |
---|
223 | * Enable debug in the driver if requested. |
---|
224 | */ |
---|
225 | if (kdebugflag) { |
---|
226 | if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { |
---|
227 | warn("ioctl (PPPIOCGFLAGS): %m"); |
---|
228 | } else { |
---|
229 | x |= (kdebugflag & 0xFF) * SC_DEBUG; |
---|
230 | if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) |
---|
231 | warn("ioctl(PPPIOCSFLAGS): %m"); |
---|
232 | } |
---|
233 | } |
---|
234 | |
---|
235 | /* |
---|
236 | * Set device for non-blocking reads. |
---|
237 | */ |
---|
238 | if ((initfdflags = fcntl(fd, F_GETFL)) == -1 |
---|
239 | || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) { |
---|
240 | warn("Couldn't set device to non-blocking mode: %m"); |
---|
241 | } |
---|
242 | |
---|
243 | return fd; |
---|
244 | } |
---|
245 | |
---|
246 | /* |
---|
247 | * restore_loop - reattach the ppp unit to the loopback. |
---|
248 | */ |
---|
249 | void |
---|
250 | restore_loop(void) |
---|
251 | { |
---|
252 | int x; |
---|
253 | |
---|
254 | /* |
---|
255 | * Transfer the ppp interface back to the loopback. |
---|
256 | */ |
---|
257 | if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) |
---|
258 | fatal("ioctl(transfer ppp unit): %m"); |
---|
259 | x = PPPDISC; |
---|
260 | if (ioctl(loop_slave, TIOCSETD, &x) < 0) |
---|
261 | fatal("ioctl(TIOCSETD): %m"); |
---|
262 | |
---|
263 | /* |
---|
264 | * Check that we got the same unit again. |
---|
265 | */ |
---|
266 | if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0) |
---|
267 | fatal("ioctl(PPPIOCGUNIT): %m"); |
---|
268 | if (x != pppifunit) |
---|
269 | fatal("transfer_ppp failed: wanted unit %d, got %d", pppifunit, x); |
---|
270 | ppp_fd = loop_slave; |
---|
271 | } |
---|
272 | |
---|
273 | |
---|
274 | /* |
---|
275 | * disestablish_ppp - Restore the serial port to normal operation. |
---|
276 | * This shouldn't call die() because it's called from die(). |
---|
277 | */ |
---|
278 | void |
---|
279 | disestablish_ppp( |
---|
280 | int fd) |
---|
281 | { |
---|
282 | int taskid = (int)0; |
---|
283 | |
---|
284 | /* clear pppd taskid from the driver */ |
---|
285 | ioctl(fd, PPPIOCSTASK, &taskid); |
---|
286 | |
---|
287 | /* Reset non-blocking mode on fd. */ |
---|
288 | if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0) |
---|
289 | warn("Couldn't restore device fd flags: %m"); |
---|
290 | initfdflags = -1; |
---|
291 | |
---|
292 | /* Restore old line discipline. */ |
---|
293 | if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0) |
---|
294 | error("ioctl(TIOCSETD): %m"); |
---|
295 | initdisc = -1; |
---|
296 | |
---|
297 | if (fd == ppp_fd) |
---|
298 | ppp_fd = -1; |
---|
299 | } |
---|
300 | |
---|
301 | /* |
---|
302 | * Check whether the link seems not to be 8-bit clean. |
---|
303 | */ |
---|
304 | void |
---|
305 | clean_check(void) |
---|
306 | { |
---|
307 | int x; |
---|
308 | char *s; |
---|
309 | |
---|
310 | if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) { |
---|
311 | s = NULL; |
---|
312 | switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) { |
---|
313 | case SC_RCV_B7_0: |
---|
314 | s = "bit 7 set to 1"; |
---|
315 | break; |
---|
316 | case SC_RCV_B7_1: |
---|
317 | s = "bit 7 set to 0"; |
---|
318 | break; |
---|
319 | case SC_RCV_EVNP: |
---|
320 | s = "odd parity"; |
---|
321 | break; |
---|
322 | case SC_RCV_ODDP: |
---|
323 | s = "even parity"; |
---|
324 | break; |
---|
325 | } |
---|
326 | if (s != NULL) { |
---|
327 | warn("Serial link is not 8-bit clean:"); |
---|
328 | warn("All received characters had %s", s); |
---|
329 | } |
---|
330 | } |
---|
331 | } |
---|
332 | |
---|
333 | /* |
---|
334 | * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity, |
---|
335 | * at the requested speed, etc. If `local' is true, set CLOCAL |
---|
336 | * regardless of whether the modem option was specified. |
---|
337 | * |
---|
338 | * For *BSD, we assume that speed_t values numerically equal bits/second. |
---|
339 | */ |
---|
340 | void |
---|
341 | set_up_tty( |
---|
342 | int fd, int local) |
---|
343 | { |
---|
344 | struct termios tios; |
---|
345 | |
---|
346 | if (tcgetattr(fd, &tios) < 0) |
---|
347 | fatal("tcgetattr: %m"); |
---|
348 | |
---|
349 | if (!restore_term) { |
---|
350 | inittermios = tios; |
---|
351 | ioctl(fd, TIOCGWINSZ, &wsinfo); |
---|
352 | } |
---|
353 | |
---|
354 | tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL); |
---|
355 | if (crtscts > 0 && !local) { |
---|
356 | if (crtscts == 2) { |
---|
357 | #ifdef CDTRCTS |
---|
358 | tios.c_cflag |= CDTRCTS; |
---|
359 | #endif |
---|
360 | } else |
---|
361 | tios.c_cflag |= CRTSCTS; |
---|
362 | } else if (crtscts < 0) { |
---|
363 | tios.c_cflag &= ~CRTSCTS; |
---|
364 | #ifdef CDTRCTS |
---|
365 | tios.c_cflag &= ~CDTRCTS; |
---|
366 | #endif |
---|
367 | } |
---|
368 | |
---|
369 | tios.c_cflag |= CS8 | CREAD | HUPCL; |
---|
370 | if (local || !modem) |
---|
371 | tios.c_cflag |= CLOCAL; |
---|
372 | tios.c_iflag = IGNBRK | IGNPAR; |
---|
373 | tios.c_oflag = 0; |
---|
374 | tios.c_lflag = 0; |
---|
375 | tios.c_cc[VMIN] = 1; |
---|
376 | tios.c_cc[VTIME] = 0; |
---|
377 | |
---|
378 | if (crtscts == -2) { |
---|
379 | tios.c_iflag |= IXON | IXOFF; |
---|
380 | tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */ |
---|
381 | tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */ |
---|
382 | } |
---|
383 | |
---|
384 | if (inspeed) { |
---|
385 | cfsetospeed(&tios, inspeed); |
---|
386 | cfsetispeed(&tios, inspeed); |
---|
387 | } else { |
---|
388 | inspeed = cfgetospeed(&tios); |
---|
389 | /* |
---|
390 | * We can't proceed if the serial port speed is 0, |
---|
391 | * since that implies that the serial port is disabled. |
---|
392 | */ |
---|
393 | if (inspeed == 0) |
---|
394 | fatal("Baud rate for %s is 0; need explicit baud rate", devnam); |
---|
395 | } |
---|
396 | baud_rate = inspeed; |
---|
397 | |
---|
398 | /* if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) { */ |
---|
399 | if (tcsetattr(fd, TCSADRAIN, &tios) < 0) { |
---|
400 | fatal("tcsetattr: %m"); |
---|
401 | } |
---|
402 | |
---|
403 | restore_term = 1; |
---|
404 | } |
---|
405 | |
---|
406 | /* |
---|
407 | * restore_tty - restore the terminal to the saved settings. |
---|
408 | */ |
---|
409 | void |
---|
410 | restore_tty( |
---|
411 | int fd) |
---|
412 | { |
---|
413 | if (restore_term) { |
---|
414 | if (!default_device) { |
---|
415 | /* |
---|
416 | * Turn off echoing, because otherwise we can get into |
---|
417 | * a loop with the tty and the modem echoing to each other. |
---|
418 | * We presume we are the sole user of this tty device, so |
---|
419 | * when we close it, it will revert to its defaults anyway. |
---|
420 | */ |
---|
421 | inittermios.c_lflag &= ~(ECHO | ECHONL); |
---|
422 | } |
---|
423 | /* if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0) { */ |
---|
424 | if (tcsetattr(fd, TCSADRAIN, &inittermios) < 0) { |
---|
425 | if (errno != ENXIO) |
---|
426 | warn("tcsetattr: %m"); |
---|
427 | } |
---|
428 | ioctl(fd, TIOCSWINSZ, &wsinfo); |
---|
429 | restore_term = 0; |
---|
430 | } |
---|
431 | } |
---|
432 | |
---|
433 | /* |
---|
434 | * setdtr - control the DTR line on the serial port. |
---|
435 | * This is called from die(), so it shouldn't call die(). |
---|
436 | */ |
---|
437 | void |
---|
438 | setdtr( |
---|
439 | int fd, int on ) |
---|
440 | { |
---|
441 | int modembits = TIOCM_DTR; |
---|
442 | |
---|
443 | ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits); |
---|
444 | } |
---|
445 | |
---|
446 | |
---|
447 | /* |
---|
448 | * open_ppp_loopback - open the device we use for getting |
---|
449 | * packets in demand mode, and connect it to a ppp interface. |
---|
450 | * Here we use a pty. |
---|
451 | */ |
---|
452 | int |
---|
453 | open_ppp_loopback(void) |
---|
454 | { |
---|
455 | return loop_master; |
---|
456 | } |
---|
457 | |
---|
458 | |
---|
459 | /* |
---|
460 | * output - Output PPP packet. |
---|
461 | */ |
---|
462 | void |
---|
463 | output( |
---|
464 | int unit, |
---|
465 | u_char *p, |
---|
466 | int len) |
---|
467 | { |
---|
468 | if (debug) |
---|
469 | dbglog("sent %P", p, len); |
---|
470 | /* printf("sent packet [%d]\n", len); */ |
---|
471 | |
---|
472 | if (write(pppd_ttyfd, p, len) < 0) { |
---|
473 | if (errno != EIO) |
---|
474 | error("write: %m"); |
---|
475 | } |
---|
476 | } |
---|
477 | |
---|
478 | void |
---|
479 | ppp_delay(void) |
---|
480 | { |
---|
481 | rtems_interval ticks; |
---|
482 | |
---|
483 | /* recommended delay to help negotiation */ |
---|
484 | ticks = 300000/rtems_bsdnet_microseconds_per_tick; |
---|
485 | rtems_task_wake_after(ticks); |
---|
486 | } |
---|
487 | |
---|
488 | /* |
---|
489 | * wait_input - wait until there is data available, |
---|
490 | * for the length of time specified by *timo (indefinite |
---|
491 | * if timo is NULL). |
---|
492 | */ |
---|
493 | void |
---|
494 | wait_input( |
---|
495 | struct timeval *timo) |
---|
496 | { |
---|
497 | rtems_event_set events; |
---|
498 | rtems_interval ticks = 0; |
---|
499 | rtems_option wait = RTEMS_WAIT; |
---|
500 | |
---|
501 | if(timo) { |
---|
502 | if(timo->tv_sec == 0 && timo->tv_usec == 0) |
---|
503 | wait = RTEMS_NO_WAIT; |
---|
504 | else { |
---|
505 | ticks = (timo->tv_sec * 1000000 + timo->tv_usec) / |
---|
506 | rtems_bsdnet_microseconds_per_tick; |
---|
507 | if(ticks <= 0) |
---|
508 | ticks = 1; |
---|
509 | } |
---|
510 | } |
---|
511 | rtems_event_receive(RTEMS_EVENT_31, RTEMS_EVENT_ANY | wait, ticks, &events); |
---|
512 | } |
---|
513 | |
---|
514 | /* |
---|
515 | * read_packet - get a PPP packet from the serial device. |
---|
516 | */ |
---|
517 | int |
---|
518 | read_packet( |
---|
519 | u_char *buf) |
---|
520 | { |
---|
521 | int len; |
---|
522 | |
---|
523 | if ((len = read(pppd_ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) { |
---|
524 | if (errno == EWOULDBLOCK || errno == EINTR) len = -1; |
---|
525 | /*fatal("read: %m"); */ |
---|
526 | } |
---|
527 | |
---|
528 | /* printf("read packet [%d]\n", len); */ |
---|
529 | return len; |
---|
530 | } |
---|
531 | |
---|
532 | |
---|
533 | /* |
---|
534 | * get_loop_output - read characters from the loopback, form them |
---|
535 | * into frames, and detect when we want to bring the real link up. |
---|
536 | * Return value is 1 if we need to bring up the link, 0 otherwise. |
---|
537 | */ |
---|
538 | int |
---|
539 | get_loop_output(void) |
---|
540 | { |
---|
541 | int rv = 0; |
---|
542 | int n; |
---|
543 | |
---|
544 | while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) { |
---|
545 | if (loop_chars(inbuf, n)) |
---|
546 | rv = 1; |
---|
547 | } |
---|
548 | |
---|
549 | if (n == 0) |
---|
550 | fatal("eof on loopback"); |
---|
551 | if (errno != EWOULDBLOCK) |
---|
552 | fatal("read from loopback: %m"); |
---|
553 | |
---|
554 | return rv; |
---|
555 | } |
---|
556 | |
---|
557 | |
---|
558 | /* |
---|
559 | * ppp_send_config - configure the transmit characteristics of |
---|
560 | * the ppp interface. |
---|
561 | */ |
---|
562 | void |
---|
563 | ppp_send_config( |
---|
564 | int unit, |
---|
565 | int mtu, |
---|
566 | uint32_t asyncmap, |
---|
567 | int pcomp, |
---|
568 | int accomp) |
---|
569 | { |
---|
570 | u_int x; |
---|
571 | struct ifreq ifr; |
---|
572 | |
---|
573 | strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); |
---|
574 | ifr.ifr_mtu = mtu; |
---|
575 | if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) |
---|
576 | fatal("ioctl(SIOCSIFMTU): %m"); |
---|
577 | |
---|
578 | if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) |
---|
579 | fatal("ioctl(PPPIOCSASYNCMAP): %m"); |
---|
580 | |
---|
581 | if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) |
---|
582 | fatal("ioctl (PPPIOCGFLAGS): %m"); |
---|
583 | x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT; |
---|
584 | x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC; |
---|
585 | /* x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC; */ |
---|
586 | if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) |
---|
587 | fatal("ioctl(PPPIOCSFLAGS): %m"); |
---|
588 | } |
---|
589 | |
---|
590 | |
---|
591 | /* |
---|
592 | * ppp_set_xaccm - set the extended transmit ACCM for the interface. |
---|
593 | */ |
---|
594 | void |
---|
595 | ppp_set_xaccm( |
---|
596 | int unit, |
---|
597 | ext_accm accm) |
---|
598 | { |
---|
599 | if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) |
---|
600 | warn("ioctl(set extended ACCM): %m"); |
---|
601 | } |
---|
602 | |
---|
603 | |
---|
604 | /* |
---|
605 | * ppp_recv_config - configure the receive-side characteristics of |
---|
606 | * the ppp interface. |
---|
607 | */ |
---|
608 | void |
---|
609 | ppp_recv_config( |
---|
610 | int unit, |
---|
611 | int mru, |
---|
612 | uint32_t asyncmap, |
---|
613 | int pcomp, int accomp) |
---|
614 | { |
---|
615 | int x; |
---|
616 | |
---|
617 | if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) |
---|
618 | fatal("ioctl(PPPIOCSMRU): %m"); |
---|
619 | if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) |
---|
620 | fatal("ioctl(PPPIOCSRASYNCMAP): %m"); |
---|
621 | if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) |
---|
622 | fatal("ioctl (PPPIOCGFLAGS): %m"); |
---|
623 | x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC; |
---|
624 | if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) |
---|
625 | fatal("ioctl(PPPIOCSFLAGS): %m"); |
---|
626 | } |
---|
627 | |
---|
628 | /* |
---|
629 | * ccp_test - ask kernel whether a given compression method |
---|
630 | * is acceptable for use. Returns 1 if the method and parameters |
---|
631 | * are OK, 0 if the method is known but the parameters are not OK |
---|
632 | * (e.g. code size should be reduced), or -1 if the method is unknown. |
---|
633 | */ |
---|
634 | int |
---|
635 | ccp_test( |
---|
636 | int unit, u_char *opt_ptr, int opt_len, int for_transmit) |
---|
637 | { |
---|
638 | struct ppp_option_data data; |
---|
639 | |
---|
640 | data.ptr = opt_ptr; |
---|
641 | data.length = opt_len; |
---|
642 | data.transmit = for_transmit; |
---|
643 | if (ioctl(pppd_ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0) |
---|
644 | return 1; |
---|
645 | return (errno == ENOBUFS)? 0: -1; |
---|
646 | } |
---|
647 | |
---|
648 | /* |
---|
649 | * ccp_flags_set - inform kernel about the current state of CCP. |
---|
650 | */ |
---|
651 | void |
---|
652 | ccp_flags_set( |
---|
653 | int unit, int isopen, int isup) |
---|
654 | { |
---|
655 | int x; |
---|
656 | |
---|
657 | if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { |
---|
658 | error("ioctl (PPPIOCGFLAGS): %m"); |
---|
659 | return; |
---|
660 | } |
---|
661 | x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN; |
---|
662 | x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP; |
---|
663 | if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) |
---|
664 | error("ioctl(PPPIOCSFLAGS): %m"); |
---|
665 | } |
---|
666 | |
---|
667 | /* |
---|
668 | * ccp_fatal_error - returns 1 if decompression was disabled as a |
---|
669 | * result of an error detected after decompression of a packet, |
---|
670 | * 0 otherwise. This is necessary because of patent nonsense. |
---|
671 | */ |
---|
672 | int |
---|
673 | ccp_fatal_error( |
---|
674 | int unit) |
---|
675 | { |
---|
676 | int x; |
---|
677 | |
---|
678 | if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { |
---|
679 | error("ioctl(PPPIOCGFLAGS): %m"); |
---|
680 | return 0; |
---|
681 | } |
---|
682 | return x & SC_DC_FERROR; |
---|
683 | } |
---|
684 | |
---|
685 | /* |
---|
686 | * get_idle_time - return how long the link has been idle. |
---|
687 | */ |
---|
688 | int |
---|
689 | get_idle_time( |
---|
690 | int u, |
---|
691 | struct ppp_idle *ip) |
---|
692 | { |
---|
693 | return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0; |
---|
694 | } |
---|
695 | |
---|
696 | /* |
---|
697 | * get_ppp_stats - return statistics for the link. |
---|
698 | */ |
---|
699 | int |
---|
700 | get_ppp_stats( |
---|
701 | int u, |
---|
702 | struct pppd_stats *stats) |
---|
703 | { |
---|
704 | struct ifpppstatsreq req; |
---|
705 | |
---|
706 | memset (&req, 0, sizeof (req)); |
---|
707 | strlcpy(req.ifr_name, ifname, sizeof(req.ifr_name)); |
---|
708 | if (ioctl(sockfd, SIOCGPPPSTATS, &req) < 0) { |
---|
709 | error("Couldn't get PPP statistics: %m"); |
---|
710 | return 0; |
---|
711 | } |
---|
712 | stats->bytes_in = req.stats.p.ppp_ibytes; |
---|
713 | stats->bytes_out = req.stats.p.ppp_obytes; |
---|
714 | return 1; |
---|
715 | } |
---|
716 | |
---|
717 | |
---|
718 | #ifdef PPP_FILTER |
---|
719 | /* |
---|
720 | * set_filters - transfer the pass and active filters to the kernel. |
---|
721 | */ |
---|
722 | int |
---|
723 | set_filters( |
---|
724 | struct bpf_program *pass, struct bpf_program *active) |
---|
725 | { |
---|
726 | int ret = 1; |
---|
727 | |
---|
728 | if (pass->bf_len > 0) { |
---|
729 | if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) { |
---|
730 | error("Couldn't set pass-filter in kernel: %m"); |
---|
731 | ret = 0; |
---|
732 | } |
---|
733 | } |
---|
734 | if (active->bf_len > 0) { |
---|
735 | if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) { |
---|
736 | error("Couldn't set active-filter in kernel: %m"); |
---|
737 | ret = 0; |
---|
738 | } |
---|
739 | } |
---|
740 | return ret; |
---|
741 | } |
---|
742 | #endif |
---|
743 | |
---|
744 | /* |
---|
745 | * sifvjcomp - config tcp header compression |
---|
746 | */ |
---|
747 | int |
---|
748 | sifvjcomp( |
---|
749 | int u, int vjcomp, int cidcomp, int maxcid) |
---|
750 | { |
---|
751 | u_int x; |
---|
752 | |
---|
753 | if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { |
---|
754 | error("ioctl (PPPIOCGFLAGS): %m"); |
---|
755 | return 0; |
---|
756 | } |
---|
757 | x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP; |
---|
758 | x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID; |
---|
759 | if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { |
---|
760 | error("ioctl(PPPIOCSFLAGS): %m"); |
---|
761 | return 0; |
---|
762 | } |
---|
763 | if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) { |
---|
764 | error("ioctl(PPPIOCSMAXCID): %m"); |
---|
765 | return 0; |
---|
766 | } |
---|
767 | return 1; |
---|
768 | } |
---|
769 | |
---|
770 | /* |
---|
771 | * sifup - Config the interface up and enable IP packets to pass. |
---|
772 | */ |
---|
773 | int |
---|
774 | sifup( |
---|
775 | int u) |
---|
776 | { |
---|
777 | struct ifreq ifr; |
---|
778 | |
---|
779 | strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); |
---|
780 | if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { |
---|
781 | error("ioctl (SIOCGIFFLAGS): %m"); |
---|
782 | return 0; |
---|
783 | } |
---|
784 | ifr.ifr_flags |= IFF_UP; |
---|
785 | if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { |
---|
786 | error("ioctl(SIOCSIFFLAGS): %m"); |
---|
787 | return 0; |
---|
788 | } |
---|
789 | if_is_up = 1; |
---|
790 | return 1; |
---|
791 | } |
---|
792 | |
---|
793 | /* |
---|
794 | * sifnpmode - Set the mode for handling packets for a given NP. |
---|
795 | */ |
---|
796 | int |
---|
797 | sifnpmode( |
---|
798 | int u, |
---|
799 | int proto, |
---|
800 | enum NPmode mode) |
---|
801 | { |
---|
802 | struct npioctl npi; |
---|
803 | |
---|
804 | npi.protocol = proto; |
---|
805 | npi.mode = mode; |
---|
806 | if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) { |
---|
807 | error("ioctl(set NP %d mode to %d): %m", proto, mode); |
---|
808 | return 0; |
---|
809 | } |
---|
810 | return 1; |
---|
811 | } |
---|
812 | |
---|
813 | /* |
---|
814 | * sifdown - Config the interface down and disable IP. |
---|
815 | */ |
---|
816 | int |
---|
817 | sifdown( |
---|
818 | int u) |
---|
819 | { |
---|
820 | struct ifreq ifr; |
---|
821 | int rv; |
---|
822 | struct npioctl npi; |
---|
823 | |
---|
824 | rv = 1; |
---|
825 | npi.protocol = PPP_IP; |
---|
826 | npi.mode = NPMODE_ERROR; |
---|
827 | ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi); |
---|
828 | /* ignore errors, because ppp_fd might have been closed by now. */ |
---|
829 | |
---|
830 | strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); |
---|
831 | if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { |
---|
832 | error("ioctl (SIOCGIFFLAGS): %m"); |
---|
833 | rv = 0; |
---|
834 | } else { |
---|
835 | ifr.ifr_flags &= ~IFF_UP; |
---|
836 | if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { |
---|
837 | error("ioctl(SIOCSIFFLAGS): %m"); |
---|
838 | rv = 0; |
---|
839 | } else |
---|
840 | if_is_up = 0; |
---|
841 | } |
---|
842 | return rv; |
---|
843 | } |
---|
844 | |
---|
845 | /* |
---|
846 | * SET_SA_FAMILY - set the sa_family field of a struct sockaddr, |
---|
847 | * if it exists. |
---|
848 | */ |
---|
849 | #define SET_SA_FAMILY(addr, family) \ |
---|
850 | BZERO((char *) &(addr), sizeof(addr)); \ |
---|
851 | addr.sa_family = (family); \ |
---|
852 | addr.sa_len = sizeof(addr); |
---|
853 | |
---|
854 | /* |
---|
855 | * sifaddr - Config the interface IP addresses and netmask. |
---|
856 | */ |
---|
857 | int |
---|
858 | sifaddr( |
---|
859 | int u, |
---|
860 | uint32_t o, uint32_t h, uint32_t m ) |
---|
861 | { |
---|
862 | struct ifaliasreq ifra; |
---|
863 | struct ifreq ifr; |
---|
864 | |
---|
865 | strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name)); |
---|
866 | SET_SA_FAMILY(ifra.ifra_addr, AF_INET); |
---|
867 | ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o; |
---|
868 | SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET); |
---|
869 | ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h; |
---|
870 | if (m != 0) { |
---|
871 | SET_SA_FAMILY(ifra.ifra_mask, AF_INET); |
---|
872 | ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m; |
---|
873 | } else |
---|
874 | BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask)); |
---|
875 | BZERO(&ifr, sizeof(ifr)); |
---|
876 | strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
---|
877 | if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) { |
---|
878 | if (errno != EADDRNOTAVAIL) |
---|
879 | warn("Couldn't remove interface address: %m"); |
---|
880 | } |
---|
881 | if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) { |
---|
882 | if (errno != EEXIST) { |
---|
883 | error("Couldn't set interface address: %m"); |
---|
884 | return 0; |
---|
885 | } |
---|
886 | warn("Couldn't set interface address: Address %I already exists", o); |
---|
887 | } |
---|
888 | ifaddrs[0] = o; |
---|
889 | ifaddrs[1] = h; |
---|
890 | return 1; |
---|
891 | } |
---|
892 | |
---|
893 | /* |
---|
894 | * cifaddr - Clear the interface IP addresses, and delete routes |
---|
895 | * through the interface if possible. |
---|
896 | */ |
---|
897 | int |
---|
898 | cifaddr( |
---|
899 | int u, |
---|
900 | uint32_t o, uint32_t h ) |
---|
901 | { |
---|
902 | struct ifaliasreq ifra; |
---|
903 | |
---|
904 | ifaddrs[0] = 0; |
---|
905 | strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name)); |
---|
906 | SET_SA_FAMILY(ifra.ifra_addr, AF_INET); |
---|
907 | ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o; |
---|
908 | SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET); |
---|
909 | ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h; |
---|
910 | BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask)); |
---|
911 | if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) { |
---|
912 | if (errno != EADDRNOTAVAIL) |
---|
913 | warn("Couldn't delete interface address: %m"); |
---|
914 | return 0; |
---|
915 | } |
---|
916 | return 1; |
---|
917 | } |
---|
918 | |
---|
919 | /* |
---|
920 | * sifdefaultroute - assign a default route through the address given. |
---|
921 | */ |
---|
922 | int |
---|
923 | sifdefaultroute( |
---|
924 | int u, |
---|
925 | uint32_t l, uint32_t g) |
---|
926 | { |
---|
927 | return dodefaultroute(g, 's'); |
---|
928 | } |
---|
929 | |
---|
930 | /* |
---|
931 | * cifdefaultroute - delete a default route through the address given. |
---|
932 | */ |
---|
933 | int |
---|
934 | cifdefaultroute( |
---|
935 | int u, |
---|
936 | uint32_t l, uint32_t g) |
---|
937 | { |
---|
938 | return dodefaultroute(g, 'c'); |
---|
939 | } |
---|
940 | |
---|
941 | /* |
---|
942 | * dodefaultroute - talk to a routing socket to add/delete a default route. |
---|
943 | */ |
---|
944 | static int |
---|
945 | dodefaultroute( |
---|
946 | uint32_t g, |
---|
947 | int cmd) |
---|
948 | { |
---|
949 | /* int status; */ |
---|
950 | struct sockaddr_in address; |
---|
951 | struct sockaddr_in netmask; |
---|
952 | struct sockaddr_in gateway; |
---|
953 | |
---|
954 | memset((void *) &address, 0, sizeof(address)); |
---|
955 | address.sin_len = sizeof address; |
---|
956 | address.sin_family = AF_INET; |
---|
957 | address.sin_addr.s_addr = INADDR_ANY; |
---|
958 | |
---|
959 | memset((void *) &netmask, 0, sizeof(netmask)); |
---|
960 | netmask.sin_len = sizeof netmask; |
---|
961 | netmask.sin_addr.s_addr = INADDR_ANY; |
---|
962 | netmask.sin_family = AF_INET; |
---|
963 | |
---|
964 | if (cmd=='s') { |
---|
965 | memset((void *) &gateway, 0, sizeof(gateway)); |
---|
966 | gateway.sin_len = sizeof gateway; |
---|
967 | gateway.sin_family = AF_INET; |
---|
968 | gateway.sin_addr.s_addr = g; |
---|
969 | |
---|
970 | rtems_bsdnet_rtrequest(RTM_ADD, |
---|
971 | (struct sockaddr *)&address, |
---|
972 | (struct sockaddr *)&gateway, |
---|
973 | (struct sockaddr *)&netmask, |
---|
974 | (RTF_UP|RTF_GATEWAY|RTF_STATIC), NULL); |
---|
975 | } |
---|
976 | else { |
---|
977 | memset((void *) &gateway, 0, sizeof(gateway)); |
---|
978 | gateway.sin_len = sizeof gateway; |
---|
979 | gateway.sin_family = AF_INET; |
---|
980 | gateway.sin_addr.s_addr = INADDR_ANY; |
---|
981 | |
---|
982 | rtems_bsdnet_rtrequest(RTM_DELETE, |
---|
983 | (struct sockaddr *)&address, |
---|
984 | (struct sockaddr *)&gateway, |
---|
985 | (struct sockaddr *)&netmask, |
---|
986 | (RTF_UP|RTF_STATIC), NULL); |
---|
987 | } |
---|
988 | |
---|
989 | default_route_gateway = (cmd == 's')? g: 0; |
---|
990 | |
---|
991 | return 1; |
---|
992 | } |
---|
993 | |
---|
994 | #if RTM_VERSION >= 3 |
---|
995 | |
---|
996 | /* |
---|
997 | * sifproxyarp - Make a proxy ARP entry for the peer. |
---|
998 | */ |
---|
999 | static struct { |
---|
1000 | struct rt_msghdr hdr; |
---|
1001 | struct sockaddr_inarp dst; |
---|
1002 | struct sockaddr_dl hwa; |
---|
1003 | char extra[128]; |
---|
1004 | } arpmsg; |
---|
1005 | |
---|
1006 | static int arpmsg_valid; |
---|
1007 | |
---|
1008 | int |
---|
1009 | sifproxyarp( |
---|
1010 | int unit, |
---|
1011 | uint32_t hisaddr) |
---|
1012 | { |
---|
1013 | int routes; |
---|
1014 | |
---|
1015 | /* |
---|
1016 | * Get the hardware address of an interface on the same subnet |
---|
1017 | * as our local address. |
---|
1018 | */ |
---|
1019 | memset(&arpmsg, 0, sizeof(arpmsg)); |
---|
1020 | if (!get_ether_addr(hisaddr, &arpmsg.hwa)) { |
---|
1021 | error("Cannot determine ethernet address for proxy ARP"); |
---|
1022 | return 0; |
---|
1023 | } |
---|
1024 | |
---|
1025 | if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { |
---|
1026 | error("Couldn't add proxy arp entry: socket: %m"); |
---|
1027 | return 0; |
---|
1028 | } |
---|
1029 | |
---|
1030 | arpmsg.hdr.rtm_type = RTM_ADD; |
---|
1031 | arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC; |
---|
1032 | arpmsg.hdr.rtm_version = RTM_VERSION; |
---|
1033 | arpmsg.hdr.rtm_seq = ++rtm_seq; |
---|
1034 | arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY; |
---|
1035 | arpmsg.hdr.rtm_inits = RTV_EXPIRE; |
---|
1036 | arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp); |
---|
1037 | arpmsg.dst.sin_family = AF_INET; |
---|
1038 | arpmsg.dst.sin_addr.s_addr = hisaddr; |
---|
1039 | arpmsg.dst.sin_other = SIN_PROXY; |
---|
1040 | |
---|
1041 | arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg |
---|
1042 | + arpmsg.hwa.sdl_len; |
---|
1043 | if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) { |
---|
1044 | error("Couldn't add proxy arp entry: %m"); |
---|
1045 | close(routes); |
---|
1046 | return 0; |
---|
1047 | } |
---|
1048 | |
---|
1049 | close(routes); |
---|
1050 | arpmsg_valid = 1; |
---|
1051 | proxy_arp_addr = hisaddr; |
---|
1052 | return 1; |
---|
1053 | } |
---|
1054 | |
---|
1055 | /* |
---|
1056 | * cifproxyarp - Delete the proxy ARP entry for the peer. |
---|
1057 | */ |
---|
1058 | int |
---|
1059 | cifproxyarp( |
---|
1060 | int unit, |
---|
1061 | uint32_t hisaddr) |
---|
1062 | { |
---|
1063 | int routes; |
---|
1064 | |
---|
1065 | if (!arpmsg_valid) |
---|
1066 | return 0; |
---|
1067 | arpmsg_valid = 0; |
---|
1068 | |
---|
1069 | arpmsg.hdr.rtm_type = RTM_DELETE; |
---|
1070 | arpmsg.hdr.rtm_seq = ++rtm_seq; |
---|
1071 | |
---|
1072 | if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { |
---|
1073 | error("Couldn't delete proxy arp entry: socket: %m"); |
---|
1074 | return 0; |
---|
1075 | } |
---|
1076 | |
---|
1077 | if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) { |
---|
1078 | error("Couldn't delete proxy arp entry: %m"); |
---|
1079 | close(routes); |
---|
1080 | return 0; |
---|
1081 | } |
---|
1082 | |
---|
1083 | close(routes); |
---|
1084 | proxy_arp_addr = 0; |
---|
1085 | return 1; |
---|
1086 | } |
---|
1087 | |
---|
1088 | #else /* RTM_VERSION */ |
---|
1089 | |
---|
1090 | /* |
---|
1091 | * sifproxyarp - Make a proxy ARP entry for the peer. |
---|
1092 | */ |
---|
1093 | int |
---|
1094 | sifproxyarp( |
---|
1095 | int unit, |
---|
1096 | uint32_t hisaddr) |
---|
1097 | { |
---|
1098 | struct arpreq arpreq; |
---|
1099 | struct { |
---|
1100 | struct sockaddr_dl sdl; |
---|
1101 | char space[128]; |
---|
1102 | } dls; |
---|
1103 | |
---|
1104 | BZERO(&arpreq, sizeof(arpreq)); |
---|
1105 | |
---|
1106 | /* |
---|
1107 | * Get the hardware address of an interface on the same subnet |
---|
1108 | * as our local address. |
---|
1109 | */ |
---|
1110 | if (!get_ether_addr(hisaddr, &dls.sdl)) { |
---|
1111 | error("Cannot determine ethernet address for proxy ARP"); |
---|
1112 | return 0; |
---|
1113 | } |
---|
1114 | |
---|
1115 | arpreq.arp_ha.sa_len = sizeof(struct sockaddr); |
---|
1116 | arpreq.arp_ha.sa_family = AF_UNSPEC; |
---|
1117 | BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen); |
---|
1118 | SET_SA_FAMILY(arpreq.arp_pa, AF_INET); |
---|
1119 | ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr; |
---|
1120 | arpreq.arp_flags = ATF_PERM | ATF_PUBL; |
---|
1121 | if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) { |
---|
1122 | error("Couldn't add proxy arp entry: %m"); |
---|
1123 | return 0; |
---|
1124 | } |
---|
1125 | |
---|
1126 | proxy_arp_addr = hisaddr; |
---|
1127 | return 1; |
---|
1128 | } |
---|
1129 | |
---|
1130 | /* |
---|
1131 | * cifproxyarp - Delete the proxy ARP entry for the peer. |
---|
1132 | */ |
---|
1133 | int |
---|
1134 | cifproxyarp( |
---|
1135 | int unit, |
---|
1136 | uint32_t hisaddr) |
---|
1137 | { |
---|
1138 | struct arpreq arpreq; |
---|
1139 | |
---|
1140 | BZERO(&arpreq, sizeof(arpreq)); |
---|
1141 | SET_SA_FAMILY(arpreq.arp_pa, AF_INET); |
---|
1142 | ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr; |
---|
1143 | if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) { |
---|
1144 | warn("Couldn't delete proxy arp entry: %m"); |
---|
1145 | return 0; |
---|
1146 | } |
---|
1147 | proxy_arp_addr = 0; |
---|
1148 | return 1; |
---|
1149 | } |
---|
1150 | #endif /* RTM_VERSION */ |
---|
1151 | |
---|
1152 | |
---|
1153 | /* |
---|
1154 | * get_ether_addr - get the hardware address of an interface on the |
---|
1155 | * the same subnet as ipaddr. |
---|
1156 | */ |
---|
1157 | #define MAX_IFS 32 |
---|
1158 | |
---|
1159 | static int |
---|
1160 | get_ether_addr( |
---|
1161 | uint32_t ipaddr, |
---|
1162 | struct sockaddr_dl *hwaddr) |
---|
1163 | { |
---|
1164 | struct ifreq *ifr, *ifend, *ifp; |
---|
1165 | uint32_t ina, mask; |
---|
1166 | struct sockaddr_dl *dla; |
---|
1167 | struct ifreq ifreq; |
---|
1168 | struct ifconf ifc; |
---|
1169 | struct ifreq ifs[MAX_IFS]; |
---|
1170 | |
---|
1171 | ifc.ifc_len = sizeof(ifs); |
---|
1172 | ifc.ifc_req = ifs; |
---|
1173 | if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { |
---|
1174 | error("ioctl(SIOCGIFCONF): %m"); |
---|
1175 | return 0; |
---|
1176 | } |
---|
1177 | |
---|
1178 | /* |
---|
1179 | * Scan through looking for an interface with an Internet |
---|
1180 | * address on the same subnet as `ipaddr'. |
---|
1181 | */ |
---|
1182 | ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); |
---|
1183 | for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *) |
---|
1184 | ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) { |
---|
1185 | if (ifr->ifr_addr.sa_family == AF_INET) { |
---|
1186 | ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; |
---|
1187 | strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); |
---|
1188 | /* |
---|
1189 | * Check that the interface is up, and not point-to-point |
---|
1190 | * or loopback. |
---|
1191 | */ |
---|
1192 | if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) |
---|
1193 | continue; |
---|
1194 | if ((ifreq.ifr_flags & |
---|
1195 | (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP)) |
---|
1196 | != (IFF_UP|IFF_BROADCAST)) |
---|
1197 | continue; |
---|
1198 | /* |
---|
1199 | * Get its netmask and check that it's on the right subnet. |
---|
1200 | */ |
---|
1201 | if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) |
---|
1202 | continue; |
---|
1203 | mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; |
---|
1204 | if ((ipaddr & mask) != (ina & mask)) |
---|
1205 | continue; |
---|
1206 | |
---|
1207 | break; |
---|
1208 | } |
---|
1209 | } |
---|
1210 | |
---|
1211 | if (ifr >= ifend) |
---|
1212 | return 0; |
---|
1213 | info("found interface %s for proxy arp", ifr->ifr_name); |
---|
1214 | |
---|
1215 | /* |
---|
1216 | * Now scan through again looking for a link-level address |
---|
1217 | * for this interface. |
---|
1218 | */ |
---|
1219 | ifp = ifr; |
---|
1220 | for (ifr = ifc.ifc_req; ifr < ifend; ) { |
---|
1221 | if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0 |
---|
1222 | && ifr->ifr_addr.sa_family == AF_LINK) { |
---|
1223 | /* |
---|
1224 | * Found the link-level address - copy it out |
---|
1225 | */ |
---|
1226 | dla = (struct sockaddr_dl *) &ifr->ifr_addr; |
---|
1227 | BCOPY(dla, hwaddr, dla->sdl_len); |
---|
1228 | return 1; |
---|
1229 | } |
---|
1230 | ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len); |
---|
1231 | } |
---|
1232 | |
---|
1233 | return 0; |
---|
1234 | } |
---|
1235 | |
---|
1236 | /* |
---|
1237 | * Return user specified netmask, modified by any mask we might determine |
---|
1238 | * for address `addr' (in network byte order). |
---|
1239 | * Here we scan through the system's list of interfaces, looking for |
---|
1240 | * any non-point-to-point interfaces which might appear to be on the same |
---|
1241 | * network as `addr'. If we find any, we OR in their netmask to the |
---|
1242 | * user-specified netmask. |
---|
1243 | */ |
---|
1244 | uint32_t |
---|
1245 | GetMask( |
---|
1246 | uint32_t addr) |
---|
1247 | { |
---|
1248 | uint32_t mask, nmask, ina; |
---|
1249 | struct ifreq *ifr, *ifend, ifreq; |
---|
1250 | struct ifconf ifc; |
---|
1251 | struct ifreq ifs[MAX_IFS]; |
---|
1252 | |
---|
1253 | addr = ntohl(addr); |
---|
1254 | if (IN_CLASSA(addr)) /* determine network mask for address class */ |
---|
1255 | nmask = IN_CLASSA_NET; |
---|
1256 | else if (IN_CLASSB(addr)) |
---|
1257 | nmask = IN_CLASSB_NET; |
---|
1258 | else |
---|
1259 | nmask = IN_CLASSC_NET; |
---|
1260 | /* class D nets are disallowed by bad_ip_adrs */ |
---|
1261 | mask = netmask | htonl(nmask); |
---|
1262 | |
---|
1263 | /* |
---|
1264 | * Scan through the system's network interfaces. |
---|
1265 | */ |
---|
1266 | ifc.ifc_len = sizeof(ifs); |
---|
1267 | ifc.ifc_req = ifs; |
---|
1268 | if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { |
---|
1269 | warn("ioctl(SIOCGIFCONF): %m"); |
---|
1270 | return mask; |
---|
1271 | } |
---|
1272 | ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); |
---|
1273 | for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *) |
---|
1274 | ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) { |
---|
1275 | /* |
---|
1276 | * Check the interface's internet address. |
---|
1277 | */ |
---|
1278 | if (ifr->ifr_addr.sa_family != AF_INET) |
---|
1279 | continue; |
---|
1280 | ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; |
---|
1281 | if ((ntohl(ina) & nmask) != (addr & nmask)) |
---|
1282 | continue; |
---|
1283 | /* |
---|
1284 | * Check that the interface is up, and not point-to-point or loopback. |
---|
1285 | */ |
---|
1286 | strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); |
---|
1287 | if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) |
---|
1288 | continue; |
---|
1289 | if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK)) |
---|
1290 | != IFF_UP) |
---|
1291 | continue; |
---|
1292 | /* |
---|
1293 | * Get its netmask and OR it into our mask. |
---|
1294 | */ |
---|
1295 | if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) |
---|
1296 | continue; |
---|
1297 | mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr; |
---|
1298 | } |
---|
1299 | |
---|
1300 | return mask; |
---|
1301 | } |
---|
1302 | |
---|
1303 | /* |
---|
1304 | * have_route_to - determine if the system has any route to |
---|
1305 | * a given IP address. |
---|
1306 | * For demand mode to work properly, we have to ignore routes |
---|
1307 | * through our own interface. |
---|
1308 | */ |
---|
1309 | int have_route_to(uint32_t addr) |
---|
1310 | { |
---|
1311 | return -1; |
---|
1312 | } |
---|
1313 | |
---|
1314 | /* |
---|
1315 | * Use the hostid as part of the random number seed. |
---|
1316 | */ |
---|
1317 | int |
---|
1318 | get_host_seed(void) |
---|
1319 | { |
---|
1320 | return 17; |
---|
1321 | } |
---|