2 * sys-bsd.c - System-dependent procedures for setting up
3 * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
5 * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. The name(s) of the authors of this software must not be used to
20 * endorse or promote products derived from this software without
21 * prior written permission.
23 * 4. Redistributions of any form whatsoever must retain the following
25 * "This product includes software developed by Paul Mackerras
26 * <paulus@samba.org>".
28 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
29 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
30 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
31 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
32 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
33 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
34 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
36 * Derived from main.c and pppd.h, which are:
38 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in
49 * the documentation and/or other materials provided with the
52 * 3. The name "Carnegie Mellon University" must not be used to
53 * endorse or promote products derived from this software without
54 * prior written permission. For permission or any legal
55 * details, please contact
56 * Office of Technology Transfer
57 * Carnegie Mellon University
59 * Pittsburgh, PA 15213-3890
60 * (412) 268-4387, fax: (412) 268-7395
61 * tech-transfer@andrew.cmu.edu
63 * 4. Redistributions of any form whatsoever must retain the following
65 * "This product includes software developed by Computing Services
66 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
68 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
69 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
70 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
71 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
72 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
73 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
74 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
77 #define RCSID "$Id: sys-bsd.c,v 1.48 2002/12/04 23:03:32 paulus Exp $"
78 /* $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
92 #include <sys/ioctl.h>
93 #include <sys/types.h>
94 #include <sys/socket.h>
97 #include <sys/param.h>
106 #include <net/ppp_defs.h>
107 #include <net/if_ppp.h>
108 #include <net/route.h>
109 #include <net/if_dl.h>
110 #include <netinet/in.h>
113 #include <sys/param.h>
114 #if defined(NetBSD) && (NetBSD >= 199703)
115 #include <netinet/if_inarp.h>
116 #else /* NetBSD 1.2D or later */
118 #include <netinet/if_ether.h>
120 #include <net/if_ether.h>
129 static const char rcsid[] = RCSID;
131 static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
132 static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
133 static int ppp_fd = -1; /* fd which is set to PPP discipline */
136 static int restore_term; /* 1 => we've munged the terminal */
137 static struct termios inittermios; /* Initial TTY termios */
138 static struct winsize wsinfo; /* Initial window size info */
140 static int loop_slave = -1;
141 static int loop_master;
142 static char loop_name[20];
144 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
146 static int sockfd; /* socket for doing interface ioctls */
148 static fd_set in_fds; /* set of fds that wait_input waits for */
149 static int max_in_fd; /* highest fd set in in_fds */
151 static int if_is_up; /* the interface is currently up */
152 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
153 static u_int32_t default_route_gateway; /* gateway addr for default route */
154 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
156 /* Prototypes for procedures local to this file. */
157 static int dodefaultroute __P((u_int32_t, int));
158 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
162 * sys_init - System-dependent initialization.
167 /* Get an internet socket for doing socket ioctl's on. */
168 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
169 fatal("Couldn't create IP socket: %m");
176 * sys_cleanup - restore any system state we modified before exiting:
177 * mark the interface down, delete default route and/or proxy arp entry.
178 * This should call die() because it's called from die().
186 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
187 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
188 && ((ifr.ifr_flags & IFF_UP) != 0)) {
189 ifr.ifr_flags &= ~IFF_UP;
190 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
194 cifaddr(0, ifaddrs[0], ifaddrs[1]);
195 if (default_route_gateway)
196 cifdefaultroute(0, 0, default_route_gateway);
198 cifproxyarp(0, proxy_arp_addr);
202 * sys_close - Clean up in a child process before execing.
208 if (loop_slave >= 0) {
215 * sys_check_options - check the options that the user specified
222 warn("DTR/CTS flow control is not supported on this system");
230 * ppp_available - check whether the system has any ppp interfaces
231 * (in fact we check whether we can do an ioctl on ppp0).
238 extern char *no_ppp_msg;
240 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
241 return 1; /* can't tell */
243 strlcpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
244 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
248 This system lacks kernel support for PPP. To include PPP support\n\
249 in the kernel, please follow the steps detailed in the README.bsd\n\
250 file in the ppp-2.2 distribution.\n";
255 * establish_ppp - Turn the serial port into a ppp interface.
261 int pppdisc = PPPDISC;
266 * Demand mode - prime the old ppp device to relinquish the unit.
268 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
269 fatal("ioctl(transfer ppp unit): %m");
273 * Save the old line discipline of fd, and set it to PPP.
275 if (ioctl(fd, TIOCGETD, &initdisc) < 0)
276 fatal("ioctl(TIOCGETD): %m");
277 if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
278 fatal("ioctl(TIOCSETD): %m");
282 * Find out which interface we were given.
284 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0)
285 fatal("ioctl(PPPIOCGUNIT): %m");
288 * Check that we got the same unit again.
290 if (ioctl(fd, PPPIOCGUNIT, &x) < 0)
291 fatal("ioctl(PPPIOCGUNIT): %m");
293 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
295 ioctl(loop_slave, TIOCSETD, &x);
301 * Enable debug in the driver if requested.
304 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
305 warn("ioctl (PPPIOCGFLAGS): %m");
307 x |= (kdebugflag & 0xFF) * SC_DEBUG;
308 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
309 warn("ioctl(PPPIOCSFLAGS): %m");
314 * Set device for non-blocking reads.
316 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
317 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
318 warn("Couldn't set device to non-blocking mode: %m");
325 * restore_loop - reattach the ppp unit to the loopback.
333 * Transfer the ppp interface back to the loopback.
335 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
336 fatal("ioctl(transfer ppp unit): %m");
338 if (ioctl(loop_slave, TIOCSETD, &x) < 0)
339 fatal("ioctl(TIOCSETD): %m");
342 * Check that we got the same unit again.
344 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
345 fatal("ioctl(PPPIOCGUNIT): %m");
347 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
353 * disestablish_ppp - Restore the serial port to normal operation.
354 * This shouldn't call die() because it's called from die().
360 /* Reset non-blocking mode on fd. */
361 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
362 warn("Couldn't restore device fd flags: %m");
365 /* Restore old line discipline. */
366 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
367 error("ioctl(TIOCSETD): %m");
375 * Check whether the link seems not to be 8-bit clean.
383 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
385 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
387 s = "bit 7 set to 1";
390 s = "bit 7 set to 0";
400 warn("Serial link is not 8-bit clean:");
401 warn("All received characters had %s", s);
407 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
408 * at the requested speed, etc. If `local' is true, set CLOCAL
409 * regardless of whether the modem option was specified.
411 * For *BSD, we assume that speed_t values numerically equal bits/second.
414 set_up_tty(fd, local)
419 if (tcgetattr(fd, &tios) < 0)
420 fatal("tcgetattr: %m");
424 ioctl(fd, TIOCGWINSZ, &wsinfo);
427 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
428 if (crtscts > 0 && !local) {
431 tios.c_cflag |= CDTRCTS;
434 tios.c_cflag |= CRTSCTS;
435 } else if (crtscts < 0) {
436 tios.c_cflag &= ~CRTSCTS;
438 tios.c_cflag &= ~CDTRCTS;
442 tios.c_cflag |= CS8 | CREAD | HUPCL;
444 tios.c_cflag |= CLOCAL;
445 tios.c_iflag = IGNBRK | IGNPAR;
449 tios.c_cc[VTIME] = 0;
452 tios.c_iflag |= IXON | IXOFF;
453 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
454 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
458 cfsetospeed(&tios, inspeed);
459 cfsetispeed(&tios, inspeed);
461 inspeed = cfgetospeed(&tios);
463 * We can't proceed if the serial port speed is 0,
464 * since that implies that the serial port is disabled.
467 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
471 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
472 fatal("tcsetattr: %m");
478 * restore_tty - restore the terminal to the saved settings.
485 if (!default_device) {
487 * Turn off echoing, because otherwise we can get into
488 * a loop with the tty and the modem echoing to each other.
489 * We presume we are the sole user of this tty device, so
490 * when we close it, it will revert to its defaults anyway.
492 inittermios.c_lflag &= ~(ECHO | ECHONL);
494 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
496 warn("tcsetattr: %m");
497 ioctl(fd, TIOCSWINSZ, &wsinfo);
503 * setdtr - control the DTR line on the serial port.
504 * This is called from die(), so it shouldn't call die().
510 int modembits = TIOCM_DTR;
512 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
516 * get_pty - get a pty master/slave pair and chown the slave side
517 * to the uid given. Assumes slave_name points to >= 12 bytes of space.
520 get_pty(master_fdp, slave_fdp, slave_name, uid)
528 if (openpty(master_fdp, slave_fdp, slave_name, NULL, NULL) < 0)
531 fchown(*slave_fdp, uid, -1);
532 fchmod(*slave_fdp, S_IRUSR | S_IWUSR);
533 if (tcgetattr(*slave_fdp, &tios) == 0) {
534 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
535 tios.c_cflag |= CS8 | CREAD;
536 tios.c_iflag = IGNPAR | CLOCAL;
539 if (tcsetattr(*slave_fdp, TCSAFLUSH, &tios) < 0)
540 warn("couldn't set attributes on pty: %m");
542 warn("couldn't get attributes on pty: %m");
549 * open_ppp_loopback - open the device we use for getting
550 * packets in demand mode, and connect it to a ppp interface.
558 int pppdisc = PPPDISC;
560 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
561 fatal("No free pty for loopback");
562 SYSDEBUG(("using %s for loopback", loop_name));
564 if (tcgetattr(loop_slave, &tios) == 0) {
565 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
566 tios.c_cflag |= CS8 | CREAD;
567 tios.c_iflag = IGNPAR;
570 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
571 warn("couldn't set attributes on loopback: %m");
574 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
575 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
576 warn("couldn't set loopback to nonblock: %m");
579 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0)
580 fatal("ioctl(TIOCSETD): %m");
583 * Find out which interface we were given.
585 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
586 fatal("ioctl(PPPIOCGUNIT): %m");
589 * Enable debug in the driver if requested.
592 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
593 warn("ioctl (PPPIOCGFLAGS): %m");
595 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
596 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
597 warn("ioctl(PPPIOCSFLAGS): %m");
606 * output - Output PPP packet.
615 dbglog("sent %P", p, len);
617 if (write(ttyfd, p, len) < 0) {
625 * wait_input - wait until there is data available,
626 * for the length of time specified by *timo (indefinite
631 struct timeval *timo;
637 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
638 if (n < 0 && errno != EINTR)
644 * add_fd - add an fd to the set that wait_input waits for.
655 * remove_fd - remove an fd from the set that wait_input waits for.
665 * wait_loop_output - wait until there is data available on the
666 * loopback, for the length of time specified by *timo (indefinite
670 wait_loop_output(timo)
671 struct timeval *timo;
677 FD_SET(loop_master, &ready);
678 n = select(loop_master + 1, &ready, NULL, &ready, timo);
679 if (n < 0 && errno != EINTR)
685 * wait_time - wait for a given length of time or until a
686 * signal is received.
690 struct timeval *timo;
694 n = select(0, NULL, NULL, NULL, timo);
695 if (n < 0 && errno != EINTR)
702 * read_packet - get a PPP packet from the serial device.
710 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
711 if (errno == EWOULDBLOCK || errno == EINTR)
720 * get_loop_output - read characters from the loopback, form them
721 * into frames, and detect when we want to bring the real link up.
722 * Return value is 1 if we need to bring up the link, 0 otherwise.
730 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
731 if (loop_chars(inbuf, n))
736 fatal("eof on loopback");
737 if (errno != EWOULDBLOCK)
738 fatal("read from loopback: %m");
745 * ppp_send_config - configure the transmit characteristics of
749 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
757 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
759 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
760 fatal("ioctl(SIOCSIFMTU): %m");
762 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
763 fatal("ioctl(PPPIOCSASYNCMAP): %m");
765 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
766 fatal("ioctl (PPPIOCGFLAGS): %m");
767 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
768 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
769 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
770 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
771 fatal("ioctl(PPPIOCSFLAGS): %m");
776 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
779 ppp_set_xaccm(unit, accm)
783 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
784 warn("ioctl(set extended ACCM): %m");
789 * ppp_recv_config - configure the receive-side characteristics of
793 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
800 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
801 fatal("ioctl(PPPIOCSMRU): %m");
802 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
803 fatal("ioctl(PPPIOCSRASYNCMAP): %m");
804 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
805 fatal("ioctl (PPPIOCGFLAGS): %m");
806 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
807 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
808 fatal("ioctl(PPPIOCSFLAGS): %m");
812 * ccp_test - ask kernel whether a given compression method
813 * is acceptable for use. Returns 1 if the method and parameters
814 * are OK, 0 if the method is known but the parameters are not OK
815 * (e.g. code size should be reduced), or -1 if the method is unknown.
818 ccp_test(unit, opt_ptr, opt_len, for_transmit)
819 int unit, opt_len, for_transmit;
822 struct ppp_option_data data;
825 data.length = opt_len;
826 data.transmit = for_transmit;
827 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
829 return (errno == ENOBUFS)? 0: -1;
833 * ccp_flags_set - inform kernel about the current state of CCP.
836 ccp_flags_set(unit, isopen, isup)
837 int unit, isopen, isup;
841 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
842 error("ioctl (PPPIOCGFLAGS): %m");
845 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
846 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
847 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
848 error("ioctl(PPPIOCSFLAGS): %m");
852 * ccp_fatal_error - returns 1 if decompression was disabled as a
853 * result of an error detected after decompression of a packet,
854 * 0 otherwise. This is necessary because of patent nonsense.
857 ccp_fatal_error(unit)
862 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
863 error("ioctl(PPPIOCGFLAGS): %m");
866 return x & SC_DC_FERROR;
870 * get_idle_time - return how long the link has been idle.
877 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
881 * get_ppp_stats - return statistics for the link.
884 get_ppp_stats(u, stats)
886 struct pppd_stats *stats;
888 struct ifpppstatsreq req;
890 memset (&req, 0, sizeof (req));
891 strlcpy(req.ifr_name, ifname, sizeof(req.ifr_name));
892 if (ioctl(sockfd, SIOCGPPPSTATS, &req) < 0) {
893 error("Couldn't get PPP statistics: %m");
896 stats->bytes_in = req.stats.p.ppp_ibytes;
897 stats->bytes_out = req.stats.p.ppp_obytes;
904 * set_filters - transfer the pass and active filters to the kernel.
907 set_filters(pass, active)
908 struct bpf_program *pass, *active;
912 if (pass->bf_len > 0) {
913 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
914 error("Couldn't set pass-filter in kernel: %m");
918 if (active->bf_len > 0) {
919 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
920 error("Couldn't set active-filter in kernel: %m");
929 * sifvjcomp - config tcp header compression
932 sifvjcomp(u, vjcomp, cidcomp, maxcid)
933 int u, vjcomp, cidcomp, maxcid;
937 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
938 error("ioctl (PPPIOCGFLAGS): %m");
941 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
942 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
943 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
944 error("ioctl(PPPIOCSFLAGS): %m");
947 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
948 error("ioctl(PPPIOCSFLAGS): %m");
955 * sifup - Config the interface up and enable IP packets to pass.
963 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
964 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
965 error("ioctl (SIOCGIFFLAGS): %m");
968 ifr.ifr_flags |= IFF_UP;
969 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
970 error("ioctl(SIOCSIFFLAGS): %m");
978 * sifnpmode - Set the mode for handling packets for a given NP.
981 sifnpmode(u, proto, mode)
988 npi.protocol = proto;
990 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
991 error("ioctl(set NP %d mode to %d): %m", proto, mode);
998 * sifdown - Config the interface down and disable IP.
1009 npi.protocol = PPP_IP;
1010 npi.mode = NPMODE_ERROR;
1011 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
1012 /* ignore errors, because ppp_fd might have been closed by now. */
1014 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1015 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
1016 error("ioctl (SIOCGIFFLAGS): %m");
1019 ifr.ifr_flags &= ~IFF_UP;
1020 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
1021 error("ioctl(SIOCSIFFLAGS): %m");
1030 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
1033 #define SET_SA_FAMILY(addr, family) \
1034 BZERO((char *) &(addr), sizeof(addr)); \
1035 addr.sa_family = (family); \
1036 addr.sa_len = sizeof(addr);
1039 * sifaddr - Config the interface IP addresses and netmask.
1046 struct ifaliasreq ifra;
1049 strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
1050 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1051 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1052 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1053 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1055 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
1056 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
1058 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1059 BZERO(&ifr, sizeof(ifr));
1060 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1061 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
1062 if (errno != EADDRNOTAVAIL)
1063 warn("Couldn't remove interface address: %m");
1065 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
1066 if (errno != EEXIST) {
1067 error("Couldn't set interface address: %m");
1070 warn("Couldn't set interface address: Address %I already exists", o);
1078 * cifaddr - Clear the interface IP addresses, and delete routes
1079 * through the interface if possible.
1086 struct ifaliasreq ifra;
1089 strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
1090 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1091 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1092 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1093 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1094 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1095 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
1096 if (errno != EADDRNOTAVAIL)
1097 warn("Couldn't delete interface address: %m");
1104 * sifdefaultroute - assign a default route through the address given.
1107 sifdefaultroute(u, l, g)
1111 return dodefaultroute(g, 's');
1115 * cifdefaultroute - delete a default route through the address given.
1118 cifdefaultroute(u, l, g)
1122 return dodefaultroute(g, 'c');
1126 * dodefaultroute - talk to a routing socket to add/delete a default route.
1129 dodefaultroute(g, cmd)
1135 struct rt_msghdr hdr;
1136 struct sockaddr_in dst;
1137 struct sockaddr_in gway;
1138 struct sockaddr_in mask;
1141 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1142 error("Couldn't %s default route: socket: %m",
1143 cmd=='s'? "add": "delete");
1147 memset(&rtmsg, 0, sizeof(rtmsg));
1148 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1149 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1150 rtmsg.hdr.rtm_version = RTM_VERSION;
1151 rtmsg.hdr.rtm_seq = ++rtm_seq;
1152 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1153 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1154 rtmsg.dst.sin_family = AF_INET;
1155 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1156 rtmsg.gway.sin_family = AF_INET;
1157 rtmsg.gway.sin_addr.s_addr = g;
1158 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1159 rtmsg.mask.sin_family = AF_INET;
1161 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1162 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1163 error("Couldn't %s default route: %m",
1164 cmd=='s'? "add": "delete");
1170 default_route_gateway = (cmd == 's')? g: 0;
1174 #if RTM_VERSION >= 3
1177 * sifproxyarp - Make a proxy ARP entry for the peer.
1180 struct rt_msghdr hdr;
1181 struct sockaddr_inarp dst;
1182 struct sockaddr_dl hwa;
1186 static int arpmsg_valid;
1189 sifproxyarp(unit, hisaddr)
1196 * Get the hardware address of an interface on the same subnet
1197 * as our local address.
1199 memset(&arpmsg, 0, sizeof(arpmsg));
1200 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1201 error("Cannot determine ethernet address for proxy ARP");
1205 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1206 error("Couldn't add proxy arp entry: socket: %m");
1210 arpmsg.hdr.rtm_type = RTM_ADD;
1211 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1212 arpmsg.hdr.rtm_version = RTM_VERSION;
1213 arpmsg.hdr.rtm_seq = ++rtm_seq;
1214 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1215 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1216 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1217 arpmsg.dst.sin_family = AF_INET;
1218 arpmsg.dst.sin_addr.s_addr = hisaddr;
1219 arpmsg.dst.sin_other = SIN_PROXY;
1221 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1222 + arpmsg.hwa.sdl_len;
1223 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1224 error("Couldn't add proxy arp entry: %m");
1231 proxy_arp_addr = hisaddr;
1236 * cifproxyarp - Delete the proxy ARP entry for the peer.
1239 cifproxyarp(unit, hisaddr)
1249 arpmsg.hdr.rtm_type = RTM_DELETE;
1250 arpmsg.hdr.rtm_seq = ++rtm_seq;
1252 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1253 error("Couldn't delete proxy arp entry: socket: %m");
1257 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1258 error("Couldn't delete proxy arp entry: %m");
1268 #else /* RTM_VERSION */
1271 * sifproxyarp - Make a proxy ARP entry for the peer.
1274 sifproxyarp(unit, hisaddr)
1278 struct arpreq arpreq;
1280 struct sockaddr_dl sdl;
1284 BZERO(&arpreq, sizeof(arpreq));
1287 * Get the hardware address of an interface on the same subnet
1288 * as our local address.
1290 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1291 error("Cannot determine ethernet address for proxy ARP");
1295 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1296 arpreq.arp_ha.sa_family = AF_UNSPEC;
1297 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1298 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1299 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1300 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1301 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1302 error("Couldn't add proxy arp entry: %m");
1306 proxy_arp_addr = hisaddr;
1311 * cifproxyarp - Delete the proxy ARP entry for the peer.
1314 cifproxyarp(unit, hisaddr)
1318 struct arpreq arpreq;
1320 BZERO(&arpreq, sizeof(arpreq));
1321 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1322 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1323 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1324 warn("Couldn't delete proxy arp entry: %m");
1330 #endif /* RTM_VERSION */
1334 * get_ether_addr - get the hardware address of an interface on the
1335 * the same subnet as ipaddr.
1340 get_ether_addr(ipaddr, hwaddr)
1342 struct sockaddr_dl *hwaddr;
1344 struct ifreq *ifr, *ifend, *ifp;
1345 u_int32_t ina, mask;
1346 struct sockaddr_dl *dla;
1349 struct ifreq ifs[MAX_IFS];
1351 ifc.ifc_len = sizeof(ifs);
1353 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1354 error("ioctl(SIOCGIFCONF): %m");
1359 * Scan through looking for an interface with an Internet
1360 * address on the same subnet as `ipaddr'.
1362 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1363 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1364 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1365 if (ifr->ifr_addr.sa_family == AF_INET) {
1366 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1367 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1369 * Check that the interface is up, and not point-to-point
1372 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1374 if ((ifreq.ifr_flags &
1375 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1376 != (IFF_UP|IFF_BROADCAST))
1379 * Get its netmask and check that it's on the right subnet.
1381 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1383 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1384 if ((ipaddr & mask) != (ina & mask))
1393 info("found interface %s for proxy arp", ifr->ifr_name);
1396 * Now scan through again looking for a link-level address
1397 * for this interface.
1400 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1401 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1402 && ifr->ifr_addr.sa_family == AF_LINK) {
1404 * Found the link-level address - copy it out
1406 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1407 BCOPY(dla, hwaddr, dla->sdl_len);
1410 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1417 * Return user specified netmask, modified by any mask we might determine
1418 * for address `addr' (in network byte order).
1419 * Here we scan through the system's list of interfaces, looking for
1420 * any non-point-to-point interfaces which might appear to be on the same
1421 * network as `addr'. If we find any, we OR in their netmask to the
1422 * user-specified netmask.
1428 u_int32_t mask, nmask, ina;
1429 struct ifreq *ifr, *ifend, ifreq;
1431 struct ifreq ifs[MAX_IFS];
1434 if (IN_CLASSA(addr)) /* determine network mask for address class */
1435 nmask = IN_CLASSA_NET;
1436 else if (IN_CLASSB(addr))
1437 nmask = IN_CLASSB_NET;
1439 nmask = IN_CLASSC_NET;
1440 /* class D nets are disallowed by bad_ip_adrs */
1441 mask = netmask | htonl(nmask);
1444 * Scan through the system's network interfaces.
1446 ifc.ifc_len = sizeof(ifs);
1448 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1449 warn("ioctl(SIOCGIFCONF): %m");
1452 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1453 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1454 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1456 * Check the interface's internet address.
1458 if (ifr->ifr_addr.sa_family != AF_INET)
1460 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1461 if ((ntohl(ina) & nmask) != (addr & nmask))
1464 * Check that the interface is up, and not point-to-point or loopback.
1466 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1467 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1469 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1473 * Get its netmask and OR it into our mask.
1475 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1477 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1484 * have_route_to - determine if the system has any route to
1485 * a given IP address.
1486 * For demand mode to work properly, we have to ignore routes
1487 * through our own interface.
1489 int have_route_to(u_int32_t addr)
1495 * Use the hostid as part of the random number seed.
1505 * lock - create a lock file for the named lock device
1507 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1509 static char *lock_file; /* name of lock file created */
1515 char hdb_lock_buffer[12];
1520 if ((p = strrchr(dev, '/')) != NULL)
1522 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1523 lock_file = malloc(l);
1524 if (lock_file == NULL)
1525 novm("lock file name");
1526 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1528 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1530 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1531 /* Read the lock file to find out who has the device locked */
1532 n = read(fd, hdb_lock_buffer, 11);
1534 error("Can't read pid from lock file %s", lock_file);
1537 hdb_lock_buffer[n] = 0;
1538 pid = atoi(hdb_lock_buffer);
1539 if (kill(pid, 0) == -1 && errno == ESRCH) {
1540 /* pid no longer exists - remove the lock file */
1541 if (unlink(lock_file) == 0) {
1543 notice("Removed stale lock on %s (pid %d)",
1547 warn("Couldn't remove stale lock on %s",
1550 notice("Device %s is locked by pid %d",
1555 error("Can't create lock file %s: %m", lock_file);
1561 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
1562 write(fd, hdb_lock_buffer, 11);
1569 * unlock - remove our lockfile