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) 1989 Carnegie Mellon University.
6 * Copyright (c) 1995 The Australian National University.
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
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.
24 static char rcsid[] = "$Id: sys-bsd.c,v 1.38 1999/03/16 22:53:47 paulus Exp $";
25 /* $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
40 #include <sys/ioctl.h>
41 #include <sys/types.h>
42 #include <sys/socket.h>
45 #include <sys/param.h>
54 #include <net/ppp_defs.h>
55 #include <net/if_ppp.h>
56 #include <net/route.h>
57 #include <net/if_dl.h>
58 #include <netinet/in.h>
61 #include <sys/param.h>
62 #if defined(NetBSD) && (NetBSD >= 199703)
63 #include <netinet/if_inarp.h>
64 #else /* NetBSD 1.2D or later */
66 #include <netinet/if_ether.h>
68 #include <net/if_ether.h>
77 static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
78 static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
79 static int ppp_fd = -1; /* fd which is set to PPP discipline */
82 static int restore_term; /* 1 => we've munged the terminal */
83 static struct termios inittermios; /* Initial TTY termios */
84 static struct winsize wsinfo; /* Initial window size info */
86 static char *lock_file; /* name of lock file created */
88 static int loop_slave = -1;
89 static int loop_master;
90 static char loop_name[20];
92 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
94 static int sockfd; /* socket for doing interface ioctls */
96 static fd_set in_fds; /* set of fds that wait_input waits for */
97 static int max_in_fd; /* highest fd set in in_fds */
99 static int if_is_up; /* the interface is currently up */
100 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
101 static u_int32_t default_route_gateway; /* gateway addr for default route */
102 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
104 /* Prototypes for procedures local to this file. */
105 static int dodefaultroute __P((u_int32_t, int));
106 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
110 * sys_init - System-dependent initialization.
115 /* Get an internet socket for doing socket ioctl's on. */
116 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
117 fatal("Couldn't create IP socket: %m");
124 * sys_cleanup - restore any system state we modified before exiting:
125 * mark the interface down, delete default route and/or proxy arp entry.
126 * This should call die() because it's called from die().
134 strlcpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
135 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
136 && ((ifr.ifr_flags & IFF_UP) != 0)) {
137 ifr.ifr_flags &= ~IFF_UP;
138 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
142 cifaddr(0, ifaddrs[0], ifaddrs[1]);
143 if (default_route_gateway)
144 cifdefaultroute(0, 0, default_route_gateway);
146 cifproxyarp(0, proxy_arp_addr);
150 * sys_close - Clean up in a child process before execing.
156 if (loop_slave >= 0) {
163 * sys_check_options - check the options that the user specified
170 warn("DTR/CTS flow control is not supported on this system");
178 * ppp_available - check whether the system has any ppp interfaces
179 * (in fact we check whether we can do an ioctl on ppp0).
186 extern char *no_ppp_msg;
188 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
189 return 1; /* can't tell */
191 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), "ppp0");
192 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
196 This system lacks kernel support for PPP. To include PPP support\n\
197 in the kernel, please follow the steps detailed in the README.bsd\n\
198 file in the ppp-2.2 distribution.\n";
203 * establish_ppp - Turn the serial port into a ppp interface.
209 int pppdisc = PPPDISC;
214 * Demand mode - prime the old ppp device to relinquish the unit.
216 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
217 fatal("ioctl(transfer ppp unit): %m");
221 * Save the old line discipline of fd, and set it to PPP.
223 if (ioctl(fd, TIOCGETD, &initdisc) < 0)
224 fatal("ioctl(TIOCGETD): %m");
225 if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
226 fatal("ioctl(TIOCSETD): %m");
230 * Find out which interface we were given.
232 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
233 fatal("ioctl(PPPIOCGUNIT): %m");
236 * Check that we got the same unit again.
238 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
239 fatal("ioctl(PPPIOCGUNIT): %m");
241 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
243 ioctl(loop_slave, TIOCSETD, &x);
249 * Enable debug in the driver if requested.
252 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
253 warn("ioctl (PPPIOCGFLAGS): %m");
255 x |= (kdebugflag & 0xFF) * SC_DEBUG;
256 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
257 warn("ioctl(PPPIOCSFLAGS): %m");
262 * Set device for non-blocking reads.
264 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
265 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
266 warn("Couldn't set device to non-blocking mode: %m");
273 * restore_loop - reattach the ppp unit to the loopback.
281 * Transfer the ppp interface back to the loopback.
283 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
284 fatal("ioctl(transfer ppp unit): %m");
286 if (ioctl(loop_slave, TIOCSETD, &x) < 0)
287 fatal("ioctl(TIOCSETD): %m");
290 * Check that we got the same unit again.
292 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
293 fatal("ioctl(PPPIOCGUNIT): %m");
295 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
301 * disestablish_ppp - Restore the serial port to normal operation.
302 * This shouldn't call die() because it's called from die().
308 /* Reset non-blocking mode on fd. */
309 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
310 warn("Couldn't restore device fd flags: %m");
313 /* Restore old line discipline. */
314 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
315 error("ioctl(TIOCSETD): %m");
323 * Check whether the link seems not to be 8-bit clean.
331 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
333 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
335 s = "bit 7 set to 1";
338 s = "bit 7 set to 0";
348 warn("Serial link is not 8-bit clean:");
349 warn("All received characters had %s", s);
355 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
356 * at the requested speed, etc. If `local' is true, set CLOCAL
357 * regardless of whether the modem option was specified.
359 * For *BSD, we assume that speed_t values numerically equal bits/second.
362 set_up_tty(fd, local)
367 if (tcgetattr(fd, &tios) < 0)
368 fatal("tcgetattr: %m");
372 ioctl(fd, TIOCGWINSZ, &wsinfo);
375 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
376 if (crtscts > 0 && !local) {
379 tios.c_cflag |= CDTRCTS;
382 tios.c_cflag |= CRTSCTS;
383 } else if (crtscts < 0) {
384 tios.c_cflag &= ~CRTSCTS;
386 tios.c_cflag &= ~CDTRCTS;
390 tios.c_cflag |= CS8 | CREAD | HUPCL;
392 tios.c_cflag |= CLOCAL;
393 tios.c_iflag = IGNBRK | IGNPAR;
397 tios.c_cc[VTIME] = 0;
400 tios.c_iflag |= IXON | IXOFF;
401 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
402 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
406 cfsetospeed(&tios, inspeed);
407 cfsetispeed(&tios, inspeed);
409 inspeed = cfgetospeed(&tios);
411 * We can't proceed if the serial port speed is 0,
412 * since that implies that the serial port is disabled.
415 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
419 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
420 fatal("tcsetattr: %m");
426 * restore_tty - restore the terminal to the saved settings.
433 if (!default_device) {
435 * Turn off echoing, because otherwise we can get into
436 * a loop with the tty and the modem echoing to each other.
437 * We presume we are the sole user of this tty device, so
438 * when we close it, it will revert to its defaults anyway.
440 inittermios.c_lflag &= ~(ECHO | ECHONL);
442 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
444 warn("tcsetattr: %m");
445 ioctl(fd, TIOCSWINSZ, &wsinfo);
451 * setdtr - control the DTR line on the serial port.
452 * This is called from die(), so it shouldn't call die().
458 int modembits = TIOCM_DTR;
460 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
465 * open_ppp_loopback - open the device we use for getting
466 * packets in demand mode, and connect it to a ppp interface.
474 int pppdisc = PPPDISC;
476 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
477 fatal("No free pty for loopback");
478 SYSDEBUG(("using %s for loopback", loop_name));
480 if (tcgetattr(loop_slave, &tios) == 0) {
481 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
482 tios.c_cflag |= CS8 | CREAD;
483 tios.c_iflag = IGNPAR;
486 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
487 warn("couldn't set attributes on loopback: %m");
490 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
491 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
492 warn("couldn't set loopback to nonblock: %m");
495 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0)
496 fatal("ioctl(TIOCSETD): %m");
499 * Find out which interface we were given.
501 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
502 fatal("ioctl(PPPIOCGUNIT): %m");
505 * Enable debug in the driver if requested.
508 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
509 warn("ioctl (PPPIOCGFLAGS): %m");
511 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
512 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
513 warn("ioctl(PPPIOCSFLAGS): %m");
522 * output - Output PPP packet.
531 dbglog("sent %P", p, len);
533 if (write(ttyfd, p, len) < 0) {
541 * wait_input - wait until there is data available,
542 * for the length of time specified by *timo (indefinite
547 struct timeval *timo;
553 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
554 if (n < 0 && errno != EINTR)
560 * add_fd - add an fd to the set that wait_input waits for.
570 * remove_fd - remove an fd from the set that wait_input waits for.
572 void remove_fd(int fd)
579 * wait_loop_output - wait until there is data available on the
580 * loopback, for the length of time specified by *timo (indefinite
584 wait_loop_output(timo)
585 struct timeval *timo;
591 FD_SET(loop_master, &ready);
592 n = select(loop_master + 1, &ready, NULL, &ready, timo);
593 if (n < 0 && errno != EINTR)
599 * wait_time - wait for a given length of time or until a
600 * signal is received.
604 struct timeval *timo;
608 n = select(0, NULL, NULL, NULL, timo);
609 if (n < 0 && errno != EINTR)
616 * read_packet - get a PPP packet from the serial device.
624 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
625 if (errno == EWOULDBLOCK || errno == EINTR)
634 * get_loop_output - read characters from the loopback, form them
635 * into frames, and detect when we want to bring the real link up.
636 * Return value is 1 if we need to bring up the link, 0 otherwise.
644 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
645 if (loop_chars(inbuf, n))
650 fatal("eof on loopback");
651 if (errno != EWOULDBLOCK)
652 fatal("read from loopback: %m");
659 * ppp_send_config - configure the transmit characteristics of
663 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
671 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), ifname);
673 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
674 fatal("ioctl(SIOCSIFMTU): %m");
676 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
677 fatal("ioctl(PPPIOCSASYNCMAP): %m");
679 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
680 fatal("ioctl (PPPIOCGFLAGS): %m");
681 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
682 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
683 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
684 fatal("ioctl(PPPIOCSFLAGS): %m");
689 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
692 ppp_set_xaccm(unit, accm)
696 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
697 warn("ioctl(set extended ACCM): %m");
702 * ppp_recv_config - configure the receive-side characteristics of
706 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
713 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
714 fatal("ioctl(PPPIOCSMRU): %m");
715 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
716 fatal("ioctl(PPPIOCSRASYNCMAP): %m");
717 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
718 fatal("ioctl (PPPIOCGFLAGS): %m");
719 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
720 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
721 fatal("ioctl(PPPIOCSFLAGS): %m");
725 * ccp_test - ask kernel whether a given compression method
726 * is acceptable for use. Returns 1 if the method and parameters
727 * are OK, 0 if the method is known but the parameters are not OK
728 * (e.g. code size should be reduced), or -1 if the method is unknown.
731 ccp_test(unit, opt_ptr, opt_len, for_transmit)
732 int unit, opt_len, for_transmit;
735 struct ppp_option_data data;
738 data.length = opt_len;
739 data.transmit = for_transmit;
740 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
742 return (errno == ENOBUFS)? 0: -1;
746 * ccp_flags_set - inform kernel about the current state of CCP.
749 ccp_flags_set(unit, isopen, isup)
750 int unit, isopen, isup;
754 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
755 error("ioctl (PPPIOCGFLAGS): %m");
758 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
759 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
760 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
761 error("ioctl(PPPIOCSFLAGS): %m");
765 * ccp_fatal_error - returns 1 if decompression was disabled as a
766 * result of an error detected after decompression of a packet,
767 * 0 otherwise. This is necessary because of patent nonsense.
770 ccp_fatal_error(unit)
775 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
776 error("ioctl(PPPIOCGFLAGS): %m");
779 return x & SC_DC_FERROR;
783 * get_idle_time - return how long the link has been idle.
790 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
796 * set_filters - transfer the pass and active filters to the kernel.
799 set_filters(pass, active)
800 struct bpf_program *pass, *active;
804 if (pass->bf_len > 0) {
805 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
806 error("Couldn't set pass-filter in kernel: %m");
810 if (active->bf_len > 0) {
811 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
812 error("Couldn't set active-filter in kernel: %m");
821 * sifvjcomp - config tcp header compression
824 sifvjcomp(u, vjcomp, cidcomp, maxcid)
825 int u, vjcomp, cidcomp, maxcid;
829 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
830 error("ioctl (PPPIOCGFLAGS): %m");
833 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
834 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
835 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
836 error("ioctl(PPPIOCSFLAGS): %m");
839 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
840 error("ioctl(PPPIOCSFLAGS): %m");
847 * sifup - Config the interface up and enable IP packets to pass.
855 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), ifname);
856 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
857 error("ioctl (SIOCGIFFLAGS): %m");
860 ifr.ifr_flags |= IFF_UP;
861 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
862 error("ioctl(SIOCSIFFLAGS): %m");
870 * sifnpmode - Set the mode for handling packets for a given NP.
873 sifnpmode(u, proto, mode)
880 npi.protocol = proto;
882 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
883 error("ioctl(set NP %d mode to %d): %m", proto, mode);
890 * sifdown - Config the interface down and disable IP.
901 npi.protocol = PPP_IP;
902 npi.mode = NPMODE_ERROR;
903 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
904 /* ignore errors, because ppp_fd might have been closed by now. */
906 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), ifname);
907 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
908 error("ioctl (SIOCGIFFLAGS): %m");
911 ifr.ifr_flags &= ~IFF_UP;
912 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
913 error("ioctl(SIOCSIFFLAGS): %m");
922 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
925 #define SET_SA_FAMILY(addr, family) \
926 BZERO((char *) &(addr), sizeof(addr)); \
927 addr.sa_family = (family); \
928 addr.sa_len = sizeof(addr);
931 * sifaddr - Config the interface IP addresses and netmask.
938 struct ifaliasreq ifra;
941 strlcpy(ifra.ifra_name, sizeof(ifra.ifra_name), ifname);
942 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
943 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
944 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
945 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
947 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
948 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
950 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
951 BZERO(&ifr, sizeof(ifr));
952 strlcpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
953 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
954 if (errno != EADDRNOTAVAIL)
955 warn("Couldn't remove interface address: %m");
957 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
958 if (errno != EEXIST) {
959 error("Couldn't set interface address: %m");
962 warn("Couldn't set interface address: Address %I already exists", o);
970 * cifaddr - Clear the interface IP addresses, and delete routes
971 * through the interface if possible.
978 struct ifaliasreq ifra;
981 strlcpy(ifra.ifra_name, sizeof(ifra.ifra_name), ifname);
982 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
983 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
984 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
985 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
986 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
987 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
988 if (errno != EADDRNOTAVAIL)
989 warn("Couldn't delete interface address: %m");
996 * sifdefaultroute - assign a default route through the address given.
999 sifdefaultroute(u, l, g)
1003 return dodefaultroute(g, 's');
1007 * cifdefaultroute - delete a default route through the address given.
1010 cifdefaultroute(u, l, g)
1014 return dodefaultroute(g, 'c');
1018 * dodefaultroute - talk to a routing socket to add/delete a default route.
1021 dodefaultroute(g, cmd)
1027 struct rt_msghdr hdr;
1028 struct sockaddr_in dst;
1029 struct sockaddr_in gway;
1030 struct sockaddr_in mask;
1033 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1034 error("Couldn't %s default route: socket: %m",
1035 cmd=='s'? "add": "delete");
1039 memset(&rtmsg, 0, sizeof(rtmsg));
1040 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1041 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1042 rtmsg.hdr.rtm_version = RTM_VERSION;
1043 rtmsg.hdr.rtm_seq = ++rtm_seq;
1044 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1045 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1046 rtmsg.dst.sin_family = AF_INET;
1047 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1048 rtmsg.gway.sin_family = AF_INET;
1049 rtmsg.gway.sin_addr.s_addr = g;
1050 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1051 rtmsg.mask.sin_family = AF_INET;
1053 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1054 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1055 error("Couldn't %s default route: %m",
1056 cmd=='s'? "add": "delete");
1062 default_route_gateway = (cmd == 's')? g: 0;
1066 #if RTM_VERSION >= 3
1069 * sifproxyarp - Make a proxy ARP entry for the peer.
1072 struct rt_msghdr hdr;
1073 struct sockaddr_inarp dst;
1074 struct sockaddr_dl hwa;
1078 static int arpmsg_valid;
1081 sifproxyarp(unit, hisaddr)
1088 * Get the hardware address of an interface on the same subnet
1089 * as our local address.
1091 memset(&arpmsg, 0, sizeof(arpmsg));
1092 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1093 error("Cannot determine ethernet address for proxy ARP");
1097 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1098 error("Couldn't add proxy arp entry: socket: %m");
1102 arpmsg.hdr.rtm_type = RTM_ADD;
1103 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1104 arpmsg.hdr.rtm_version = RTM_VERSION;
1105 arpmsg.hdr.rtm_seq = ++rtm_seq;
1106 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1107 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1108 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1109 arpmsg.dst.sin_family = AF_INET;
1110 arpmsg.dst.sin_addr.s_addr = hisaddr;
1111 arpmsg.dst.sin_other = SIN_PROXY;
1113 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1114 + arpmsg.hwa.sdl_len;
1115 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1116 error("Couldn't add proxy arp entry: %m");
1123 proxy_arp_addr = hisaddr;
1128 * cifproxyarp - Delete the proxy ARP entry for the peer.
1131 cifproxyarp(unit, hisaddr)
1141 arpmsg.hdr.rtm_type = RTM_DELETE;
1142 arpmsg.hdr.rtm_seq = ++rtm_seq;
1144 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1145 error("Couldn't delete proxy arp entry: socket: %m");
1149 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1150 error("Couldn't delete proxy arp entry: %m");
1160 #else /* RTM_VERSION */
1163 * sifproxyarp - Make a proxy ARP entry for the peer.
1166 sifproxyarp(unit, hisaddr)
1170 struct arpreq arpreq;
1172 struct sockaddr_dl sdl;
1176 BZERO(&arpreq, sizeof(arpreq));
1179 * Get the hardware address of an interface on the same subnet
1180 * as our local address.
1182 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1183 error("Cannot determine ethernet address for proxy ARP");
1187 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1188 arpreq.arp_ha.sa_family = AF_UNSPEC;
1189 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1190 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1191 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1192 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1193 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1194 error("Couldn't add proxy arp entry: %m");
1198 proxy_arp_addr = hisaddr;
1203 * cifproxyarp - Delete the proxy ARP entry for the peer.
1206 cifproxyarp(unit, hisaddr)
1210 struct arpreq arpreq;
1212 BZERO(&arpreq, sizeof(arpreq));
1213 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1214 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1215 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1216 warn("Couldn't delete proxy arp entry: %m");
1222 #endif /* RTM_VERSION */
1226 * get_ether_addr - get the hardware address of an interface on the
1227 * the same subnet as ipaddr.
1232 get_ether_addr(ipaddr, hwaddr)
1234 struct sockaddr_dl *hwaddr;
1236 struct ifreq *ifr, *ifend, *ifp;
1237 u_int32_t ina, mask;
1238 struct sockaddr_dl *dla;
1241 struct ifreq ifs[MAX_IFS];
1243 ifc.ifc_len = sizeof(ifs);
1245 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1246 error("ioctl(SIOCGIFCONF): %m");
1251 * Scan through looking for an interface with an Internet
1252 * address on the same subnet as `ipaddr'.
1254 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1255 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1256 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1257 if (ifr->ifr_addr.sa_family == AF_INET) {
1258 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1259 strlcpy(ifreq.ifr_name, sizeof(ifreq.ifr_name), ifr->ifr_name);
1261 * Check that the interface is up, and not point-to-point
1264 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1266 if ((ifreq.ifr_flags &
1267 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1268 != (IFF_UP|IFF_BROADCAST))
1271 * Get its netmask and check that it's on the right subnet.
1273 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1275 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1276 if ((ipaddr & mask) != (ina & mask))
1285 info("found interface %s for proxy arp", ifr->ifr_name);
1288 * Now scan through again looking for a link-level address
1289 * for this interface.
1292 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1293 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1294 && ifr->ifr_addr.sa_family == AF_LINK) {
1296 * Found the link-level address - copy it out
1298 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1299 BCOPY(dla, hwaddr, dla->sdl_len);
1302 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1309 * Return user specified netmask, modified by any mask we might determine
1310 * for address `addr' (in network byte order).
1311 * Here we scan through the system's list of interfaces, looking for
1312 * any non-point-to-point interfaces which might appear to be on the same
1313 * network as `addr'. If we find any, we OR in their netmask to the
1314 * user-specified netmask.
1320 u_int32_t mask, nmask, ina;
1321 struct ifreq *ifr, *ifend, ifreq;
1323 struct ifreq ifs[MAX_IFS];
1326 if (IN_CLASSA(addr)) /* determine network mask for address class */
1327 nmask = IN_CLASSA_NET;
1328 else if (IN_CLASSB(addr))
1329 nmask = IN_CLASSB_NET;
1331 nmask = IN_CLASSC_NET;
1332 /* class D nets are disallowed by bad_ip_adrs */
1333 mask = netmask | htonl(nmask);
1336 * Scan through the system's network interfaces.
1338 ifc.ifc_len = sizeof(ifs);
1340 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1341 warn("ioctl(SIOCGIFCONF): %m");
1344 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1345 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1346 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1348 * Check the interface's internet address.
1350 if (ifr->ifr_addr.sa_family != AF_INET)
1352 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1353 if ((ntohl(ina) & nmask) != (addr & nmask))
1356 * Check that the interface is up, and not point-to-point or loopback.
1358 strlcpy(ifreq.ifr_name, sizeof(ifreq.ifr_name), ifr->ifr_name);
1359 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1361 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1365 * Get its netmask and OR it into our mask.
1367 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1369 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1376 * have_route_to - determine if the system has any route to
1377 * a given IP address.
1378 * For demand mode to work properly, we have to ignore routes
1379 * through our own interface.
1381 int have_route_to(u_int32_t addr)
1387 * Use the hostid as part of the random number seed.
1396 * lock - create a lock file for the named lock device
1398 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1404 char hdb_lock_buffer[12];
1409 if ((p = strrchr(dev, '/')) != NULL)
1411 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1412 lock_file = malloc(l);
1413 if (lock_file == NULL)
1414 novm("lock file name");
1415 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1417 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1419 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1420 /* Read the lock file to find out who has the device locked */
1421 n = read(fd, hdb_lock_buffer, 11);
1423 error("Can't read pid from lock file %s", lock_file);
1426 hdb_lock_buffer[n] = 0;
1427 pid = atoi(hdb_lock_buffer);
1428 if (kill(pid, 0) == -1 && errno == ESRCH) {
1429 /* pid no longer exists - remove the lock file */
1430 if (unlink(lock_file) == 0) {
1432 notice("Removed stale lock on %s (pid %d)",
1436 warn("Couldn't remove stale lock on %s",
1439 notice("Device %s is locked by pid %d",
1444 error("Can't create lock file %s: %m", lock_file);
1450 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
1451 write(fd, hdb_lock_buffer, 11);
1458 * unlock - remove our lockfile