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.
23 #define RCSID "$Id: sys-bsd.c,v 1.47 2000/04/13 12:04:23 paulus Exp $"
24 /* $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
38 #include <sys/ioctl.h>
39 #include <sys/types.h>
40 #include <sys/socket.h>
43 #include <sys/param.h>
52 #include <net/ppp_defs.h>
53 #include <net/if_ppp.h>
54 #include <net/route.h>
55 #include <net/if_dl.h>
56 #include <netinet/in.h>
59 #include <sys/param.h>
60 #if defined(NetBSD) && (NetBSD >= 199703)
61 #include <netinet/if_inarp.h>
62 #else /* NetBSD 1.2D or later */
64 #include <netinet/if_ether.h>
66 #include <net/if_ether.h>
75 static const char rcsid[] = RCSID;
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 int loop_slave = -1;
87 static int loop_master;
88 static char loop_name[20];
90 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
92 static int sockfd; /* socket for doing interface ioctls */
94 static fd_set in_fds; /* set of fds that wait_input waits for */
95 static int max_in_fd; /* highest fd set in in_fds */
97 static int if_is_up; /* the interface is currently up */
98 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
99 static u_int32_t default_route_gateway; /* gateway addr for default route */
100 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
102 /* Prototypes for procedures local to this file. */
103 static int dodefaultroute __P((u_int32_t, int));
104 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
108 * sys_init - System-dependent initialization.
113 /* Get an internet socket for doing socket ioctl's on. */
114 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
115 fatal("Couldn't create IP socket: %m");
122 * sys_cleanup - restore any system state we modified before exiting:
123 * mark the interface down, delete default route and/or proxy arp entry.
124 * This should call die() because it's called from die().
132 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
133 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
134 && ((ifr.ifr_flags & IFF_UP) != 0)) {
135 ifr.ifr_flags &= ~IFF_UP;
136 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
140 cifaddr(0, ifaddrs[0], ifaddrs[1]);
141 if (default_route_gateway)
142 cifdefaultroute(0, 0, default_route_gateway);
144 cifproxyarp(0, proxy_arp_addr);
148 * sys_close - Clean up in a child process before execing.
154 if (loop_slave >= 0) {
161 * sys_check_options - check the options that the user specified
168 warn("DTR/CTS flow control is not supported on this system");
176 * ppp_available - check whether the system has any ppp interfaces
177 * (in fact we check whether we can do an ioctl on ppp0).
184 extern char *no_ppp_msg;
186 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
187 return 1; /* can't tell */
189 strlcpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
190 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
194 This system lacks kernel support for PPP. To include PPP support\n\
195 in the kernel, please follow the steps detailed in the README.bsd\n\
196 file in the ppp-2.2 distribution.\n";
201 * establish_ppp - Turn the serial port into a ppp interface.
207 int pppdisc = PPPDISC;
212 * Demand mode - prime the old ppp device to relinquish the unit.
214 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
215 fatal("ioctl(transfer ppp unit): %m");
219 * Save the old line discipline of fd, and set it to PPP.
221 if (ioctl(fd, TIOCGETD, &initdisc) < 0)
222 fatal("ioctl(TIOCGETD): %m");
223 if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
224 fatal("ioctl(TIOCSETD): %m");
228 * Find out which interface we were given.
230 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0)
231 fatal("ioctl(PPPIOCGUNIT): %m");
234 * Check that we got the same unit again.
236 if (ioctl(fd, PPPIOCGUNIT, &x) < 0)
237 fatal("ioctl(PPPIOCGUNIT): %m");
239 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
241 ioctl(loop_slave, TIOCSETD, &x);
247 * Enable debug in the driver if requested.
250 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
251 warn("ioctl (PPPIOCGFLAGS): %m");
253 x |= (kdebugflag & 0xFF) * SC_DEBUG;
254 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
255 warn("ioctl(PPPIOCSFLAGS): %m");
260 * Set device for non-blocking reads.
262 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
263 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
264 warn("Couldn't set device to non-blocking mode: %m");
271 * restore_loop - reattach the ppp unit to the loopback.
279 * Transfer the ppp interface back to the loopback.
281 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
282 fatal("ioctl(transfer ppp unit): %m");
284 if (ioctl(loop_slave, TIOCSETD, &x) < 0)
285 fatal("ioctl(TIOCSETD): %m");
288 * Check that we got the same unit again.
290 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
291 fatal("ioctl(PPPIOCGUNIT): %m");
293 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
299 * disestablish_ppp - Restore the serial port to normal operation.
300 * This shouldn't call die() because it's called from die().
306 /* Reset non-blocking mode on fd. */
307 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
308 warn("Couldn't restore device fd flags: %m");
311 /* Restore old line discipline. */
312 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
313 error("ioctl(TIOCSETD): %m");
321 * Check whether the link seems not to be 8-bit clean.
329 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
331 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
333 s = "bit 7 set to 1";
336 s = "bit 7 set to 0";
346 warn("Serial link is not 8-bit clean:");
347 warn("All received characters had %s", s);
353 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
354 * at the requested speed, etc. If `local' is true, set CLOCAL
355 * regardless of whether the modem option was specified.
357 * For *BSD, we assume that speed_t values numerically equal bits/second.
360 set_up_tty(fd, local)
365 if (tcgetattr(fd, &tios) < 0)
366 fatal("tcgetattr: %m");
370 ioctl(fd, TIOCGWINSZ, &wsinfo);
373 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
374 if (crtscts > 0 && !local) {
377 tios.c_cflag |= CDTRCTS;
380 tios.c_cflag |= CRTSCTS;
381 } else if (crtscts < 0) {
382 tios.c_cflag &= ~CRTSCTS;
384 tios.c_cflag &= ~CDTRCTS;
388 tios.c_cflag |= CS8 | CREAD | HUPCL;
390 tios.c_cflag |= CLOCAL;
391 tios.c_iflag = IGNBRK | IGNPAR;
395 tios.c_cc[VTIME] = 0;
398 tios.c_iflag |= IXON | IXOFF;
399 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
400 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
404 cfsetospeed(&tios, inspeed);
405 cfsetispeed(&tios, inspeed);
407 inspeed = cfgetospeed(&tios);
409 * We can't proceed if the serial port speed is 0,
410 * since that implies that the serial port is disabled.
413 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
417 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
418 fatal("tcsetattr: %m");
424 * restore_tty - restore the terminal to the saved settings.
431 if (!default_device) {
433 * Turn off echoing, because otherwise we can get into
434 * a loop with the tty and the modem echoing to each other.
435 * We presume we are the sole user of this tty device, so
436 * when we close it, it will revert to its defaults anyway.
438 inittermios.c_lflag &= ~(ECHO | ECHONL);
440 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
442 warn("tcsetattr: %m");
443 ioctl(fd, TIOCSWINSZ, &wsinfo);
449 * setdtr - control the DTR line on the serial port.
450 * This is called from die(), so it shouldn't call die().
456 int modembits = TIOCM_DTR;
458 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
462 * get_pty - get a pty master/slave pair and chown the slave side
463 * to the uid given. Assumes slave_name points to >= 12 bytes of space.
466 get_pty(master_fdp, slave_fdp, slave_name, uid)
474 if (openpty(master_fdp, slave_fdp, slave_name, NULL, NULL) < 0)
477 fchown(*slave_fdp, uid, -1);
478 fchmod(*slave_fdp, S_IRUSR | S_IWUSR);
479 if (tcgetattr(*slave_fdp, &tios) == 0) {
480 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
481 tios.c_cflag |= CS8 | CREAD;
482 tios.c_iflag = IGNPAR | CLOCAL;
485 if (tcsetattr(*slave_fdp, TCSAFLUSH, &tios) < 0)
486 warn("couldn't set attributes on pty: %m");
488 warn("couldn't get attributes on pty: %m");
495 * open_ppp_loopback - open the device we use for getting
496 * packets in demand mode, and connect it to a ppp interface.
504 int pppdisc = PPPDISC;
506 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
507 fatal("No free pty for loopback");
508 SYSDEBUG(("using %s for loopback", loop_name));
510 if (tcgetattr(loop_slave, &tios) == 0) {
511 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
512 tios.c_cflag |= CS8 | CREAD;
513 tios.c_iflag = IGNPAR;
516 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
517 warn("couldn't set attributes on loopback: %m");
520 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
521 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
522 warn("couldn't set loopback to nonblock: %m");
525 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0)
526 fatal("ioctl(TIOCSETD): %m");
529 * Find out which interface we were given.
531 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
532 fatal("ioctl(PPPIOCGUNIT): %m");
535 * Enable debug in the driver if requested.
538 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
539 warn("ioctl (PPPIOCGFLAGS): %m");
541 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
542 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
543 warn("ioctl(PPPIOCSFLAGS): %m");
552 * output - Output PPP packet.
561 dbglog("sent %P", p, len);
563 if (write(ttyfd, p, len) < 0) {
571 * wait_input - wait until there is data available,
572 * for the length of time specified by *timo (indefinite
577 struct timeval *timo;
583 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
584 if (n < 0 && errno != EINTR)
590 * add_fd - add an fd to the set that wait_input waits for.
601 * remove_fd - remove an fd from the set that wait_input waits for.
611 * wait_loop_output - wait until there is data available on the
612 * loopback, for the length of time specified by *timo (indefinite
616 wait_loop_output(timo)
617 struct timeval *timo;
623 FD_SET(loop_master, &ready);
624 n = select(loop_master + 1, &ready, NULL, &ready, timo);
625 if (n < 0 && errno != EINTR)
631 * wait_time - wait for a given length of time or until a
632 * signal is received.
636 struct timeval *timo;
640 n = select(0, NULL, NULL, NULL, timo);
641 if (n < 0 && errno != EINTR)
648 * read_packet - get a PPP packet from the serial device.
656 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
657 if (errno == EWOULDBLOCK || errno == EINTR)
666 * get_loop_output - read characters from the loopback, form them
667 * into frames, and detect when we want to bring the real link up.
668 * Return value is 1 if we need to bring up the link, 0 otherwise.
676 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
677 if (loop_chars(inbuf, n))
682 fatal("eof on loopback");
683 if (errno != EWOULDBLOCK)
684 fatal("read from loopback: %m");
691 * ppp_send_config - configure the transmit characteristics of
695 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
703 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
705 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
706 fatal("ioctl(SIOCSIFMTU): %m");
708 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
709 fatal("ioctl(PPPIOCSASYNCMAP): %m");
711 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
712 fatal("ioctl (PPPIOCGFLAGS): %m");
713 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
714 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
715 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
716 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
717 fatal("ioctl(PPPIOCSFLAGS): %m");
722 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
725 ppp_set_xaccm(unit, accm)
729 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
730 warn("ioctl(set extended ACCM): %m");
735 * ppp_recv_config - configure the receive-side characteristics of
739 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
746 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
747 fatal("ioctl(PPPIOCSMRU): %m");
748 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
749 fatal("ioctl(PPPIOCSRASYNCMAP): %m");
750 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
751 fatal("ioctl (PPPIOCGFLAGS): %m");
752 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
753 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
754 fatal("ioctl(PPPIOCSFLAGS): %m");
758 * ccp_test - ask kernel whether a given compression method
759 * is acceptable for use. Returns 1 if the method and parameters
760 * are OK, 0 if the method is known but the parameters are not OK
761 * (e.g. code size should be reduced), or -1 if the method is unknown.
764 ccp_test(unit, opt_ptr, opt_len, for_transmit)
765 int unit, opt_len, for_transmit;
768 struct ppp_option_data data;
771 data.length = opt_len;
772 data.transmit = for_transmit;
773 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
775 return (errno == ENOBUFS)? 0: -1;
779 * ccp_flags_set - inform kernel about the current state of CCP.
782 ccp_flags_set(unit, isopen, isup)
783 int unit, isopen, isup;
787 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
788 error("ioctl (PPPIOCGFLAGS): %m");
791 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
792 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
793 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
794 error("ioctl(PPPIOCSFLAGS): %m");
798 * ccp_fatal_error - returns 1 if decompression was disabled as a
799 * result of an error detected after decompression of a packet,
800 * 0 otherwise. This is necessary because of patent nonsense.
803 ccp_fatal_error(unit)
808 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
809 error("ioctl(PPPIOCGFLAGS): %m");
812 return x & SC_DC_FERROR;
816 * get_idle_time - return how long the link has been idle.
823 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
827 * get_ppp_stats - return statistics for the link.
830 get_ppp_stats(u, stats)
832 struct pppd_stats *stats;
834 struct ifpppstatsreq req;
836 memset (&req, 0, sizeof (req));
837 strlcpy(req.ifr_name, ifname, sizeof(req.ifr_name));
838 if (ioctl(sockfd, SIOCGPPPSTATS, &req) < 0) {
839 error("Couldn't get PPP statistics: %m");
842 stats->bytes_in = req.stats.p.ppp_ibytes;
843 stats->bytes_out = req.stats.p.ppp_obytes;
850 * set_filters - transfer the pass and active filters to the kernel.
853 set_filters(pass, active)
854 struct bpf_program *pass, *active;
858 if (pass->bf_len > 0) {
859 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
860 error("Couldn't set pass-filter in kernel: %m");
864 if (active->bf_len > 0) {
865 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
866 error("Couldn't set active-filter in kernel: %m");
875 * sifvjcomp - config tcp header compression
878 sifvjcomp(u, vjcomp, cidcomp, maxcid)
879 int u, vjcomp, cidcomp, maxcid;
883 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
884 error("ioctl (PPPIOCGFLAGS): %m");
887 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
888 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
889 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
890 error("ioctl(PPPIOCSFLAGS): %m");
893 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
894 error("ioctl(PPPIOCSFLAGS): %m");
901 * sifup - Config the interface up and enable IP packets to pass.
909 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
910 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
911 error("ioctl (SIOCGIFFLAGS): %m");
914 ifr.ifr_flags |= IFF_UP;
915 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
916 error("ioctl(SIOCSIFFLAGS): %m");
924 * sifnpmode - Set the mode for handling packets for a given NP.
927 sifnpmode(u, proto, mode)
934 npi.protocol = proto;
936 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
937 error("ioctl(set NP %d mode to %d): %m", proto, mode);
944 * sifdown - Config the interface down and disable IP.
955 npi.protocol = PPP_IP;
956 npi.mode = NPMODE_ERROR;
957 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
958 /* ignore errors, because ppp_fd might have been closed by now. */
960 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
961 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
962 error("ioctl (SIOCGIFFLAGS): %m");
965 ifr.ifr_flags &= ~IFF_UP;
966 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
967 error("ioctl(SIOCSIFFLAGS): %m");
976 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
979 #define SET_SA_FAMILY(addr, family) \
980 BZERO((char *) &(addr), sizeof(addr)); \
981 addr.sa_family = (family); \
982 addr.sa_len = sizeof(addr);
985 * sifaddr - Config the interface IP addresses and netmask.
992 struct ifaliasreq ifra;
995 strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
996 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
997 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
998 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
999 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1001 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
1002 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
1004 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1005 BZERO(&ifr, sizeof(ifr));
1006 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1007 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
1008 if (errno != EADDRNOTAVAIL)
1009 warn("Couldn't remove interface address: %m");
1011 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
1012 if (errno != EEXIST) {
1013 error("Couldn't set interface address: %m");
1016 warn("Couldn't set interface address: Address %I already exists", o);
1024 * cifaddr - Clear the interface IP addresses, and delete routes
1025 * through the interface if possible.
1032 struct ifaliasreq ifra;
1035 strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
1036 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1037 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1038 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1039 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1040 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1041 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
1042 if (errno != EADDRNOTAVAIL)
1043 warn("Couldn't delete interface address: %m");
1050 * sifdefaultroute - assign a default route through the address given.
1053 sifdefaultroute(u, l, g)
1057 return dodefaultroute(g, 's');
1061 * cifdefaultroute - delete a default route through the address given.
1064 cifdefaultroute(u, l, g)
1068 return dodefaultroute(g, 'c');
1072 * dodefaultroute - talk to a routing socket to add/delete a default route.
1075 dodefaultroute(g, cmd)
1081 struct rt_msghdr hdr;
1082 struct sockaddr_in dst;
1083 struct sockaddr_in gway;
1084 struct sockaddr_in mask;
1087 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1088 error("Couldn't %s default route: socket: %m",
1089 cmd=='s'? "add": "delete");
1093 memset(&rtmsg, 0, sizeof(rtmsg));
1094 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1095 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1096 rtmsg.hdr.rtm_version = RTM_VERSION;
1097 rtmsg.hdr.rtm_seq = ++rtm_seq;
1098 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1099 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1100 rtmsg.dst.sin_family = AF_INET;
1101 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1102 rtmsg.gway.sin_family = AF_INET;
1103 rtmsg.gway.sin_addr.s_addr = g;
1104 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1105 rtmsg.mask.sin_family = AF_INET;
1107 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1108 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1109 error("Couldn't %s default route: %m",
1110 cmd=='s'? "add": "delete");
1116 default_route_gateway = (cmd == 's')? g: 0;
1120 #if RTM_VERSION >= 3
1123 * sifproxyarp - Make a proxy ARP entry for the peer.
1126 struct rt_msghdr hdr;
1127 struct sockaddr_inarp dst;
1128 struct sockaddr_dl hwa;
1132 static int arpmsg_valid;
1135 sifproxyarp(unit, hisaddr)
1142 * Get the hardware address of an interface on the same subnet
1143 * as our local address.
1145 memset(&arpmsg, 0, sizeof(arpmsg));
1146 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1147 error("Cannot determine ethernet address for proxy ARP");
1151 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1152 error("Couldn't add proxy arp entry: socket: %m");
1156 arpmsg.hdr.rtm_type = RTM_ADD;
1157 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1158 arpmsg.hdr.rtm_version = RTM_VERSION;
1159 arpmsg.hdr.rtm_seq = ++rtm_seq;
1160 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1161 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1162 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1163 arpmsg.dst.sin_family = AF_INET;
1164 arpmsg.dst.sin_addr.s_addr = hisaddr;
1165 arpmsg.dst.sin_other = SIN_PROXY;
1167 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1168 + arpmsg.hwa.sdl_len;
1169 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1170 error("Couldn't add proxy arp entry: %m");
1177 proxy_arp_addr = hisaddr;
1182 * cifproxyarp - Delete the proxy ARP entry for the peer.
1185 cifproxyarp(unit, hisaddr)
1195 arpmsg.hdr.rtm_type = RTM_DELETE;
1196 arpmsg.hdr.rtm_seq = ++rtm_seq;
1198 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1199 error("Couldn't delete proxy arp entry: socket: %m");
1203 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1204 error("Couldn't delete proxy arp entry: %m");
1214 #else /* RTM_VERSION */
1217 * sifproxyarp - Make a proxy ARP entry for the peer.
1220 sifproxyarp(unit, hisaddr)
1224 struct arpreq arpreq;
1226 struct sockaddr_dl sdl;
1230 BZERO(&arpreq, sizeof(arpreq));
1233 * Get the hardware address of an interface on the same subnet
1234 * as our local address.
1236 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1237 error("Cannot determine ethernet address for proxy ARP");
1241 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1242 arpreq.arp_ha.sa_family = AF_UNSPEC;
1243 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1244 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1245 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1246 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1247 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1248 error("Couldn't add proxy arp entry: %m");
1252 proxy_arp_addr = hisaddr;
1257 * cifproxyarp - Delete the proxy ARP entry for the peer.
1260 cifproxyarp(unit, hisaddr)
1264 struct arpreq arpreq;
1266 BZERO(&arpreq, sizeof(arpreq));
1267 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1268 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1269 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1270 warn("Couldn't delete proxy arp entry: %m");
1276 #endif /* RTM_VERSION */
1280 * get_ether_addr - get the hardware address of an interface on the
1281 * the same subnet as ipaddr.
1286 get_ether_addr(ipaddr, hwaddr)
1288 struct sockaddr_dl *hwaddr;
1290 struct ifreq *ifr, *ifend, *ifp;
1291 u_int32_t ina, mask;
1292 struct sockaddr_dl *dla;
1295 struct ifreq ifs[MAX_IFS];
1297 ifc.ifc_len = sizeof(ifs);
1299 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1300 error("ioctl(SIOCGIFCONF): %m");
1305 * Scan through looking for an interface with an Internet
1306 * address on the same subnet as `ipaddr'.
1308 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1309 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1310 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1311 if (ifr->ifr_addr.sa_family == AF_INET) {
1312 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1313 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1315 * Check that the interface is up, and not point-to-point
1318 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1320 if ((ifreq.ifr_flags &
1321 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1322 != (IFF_UP|IFF_BROADCAST))
1325 * Get its netmask and check that it's on the right subnet.
1327 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1329 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1330 if ((ipaddr & mask) != (ina & mask))
1339 info("found interface %s for proxy arp", ifr->ifr_name);
1342 * Now scan through again looking for a link-level address
1343 * for this interface.
1346 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1347 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1348 && ifr->ifr_addr.sa_family == AF_LINK) {
1350 * Found the link-level address - copy it out
1352 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1353 BCOPY(dla, hwaddr, dla->sdl_len);
1356 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1363 * Return user specified netmask, modified by any mask we might determine
1364 * for address `addr' (in network byte order).
1365 * Here we scan through the system's list of interfaces, looking for
1366 * any non-point-to-point interfaces which might appear to be on the same
1367 * network as `addr'. If we find any, we OR in their netmask to the
1368 * user-specified netmask.
1374 u_int32_t mask, nmask, ina;
1375 struct ifreq *ifr, *ifend, ifreq;
1377 struct ifreq ifs[MAX_IFS];
1380 if (IN_CLASSA(addr)) /* determine network mask for address class */
1381 nmask = IN_CLASSA_NET;
1382 else if (IN_CLASSB(addr))
1383 nmask = IN_CLASSB_NET;
1385 nmask = IN_CLASSC_NET;
1386 /* class D nets are disallowed by bad_ip_adrs */
1387 mask = netmask | htonl(nmask);
1390 * Scan through the system's network interfaces.
1392 ifc.ifc_len = sizeof(ifs);
1394 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1395 warn("ioctl(SIOCGIFCONF): %m");
1398 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1399 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1400 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1402 * Check the interface's internet address.
1404 if (ifr->ifr_addr.sa_family != AF_INET)
1406 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1407 if ((ntohl(ina) & nmask) != (addr & nmask))
1410 * Check that the interface is up, and not point-to-point or loopback.
1412 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1413 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1415 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1419 * Get its netmask and OR it into our mask.
1421 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1423 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1430 * have_route_to - determine if the system has any route to
1431 * a given IP address.
1432 * For demand mode to work properly, we have to ignore routes
1433 * through our own interface.
1435 int have_route_to(u_int32_t addr)
1441 * Use the hostid as part of the random number seed.
1451 * lock - create a lock file for the named lock device
1453 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1455 static char *lock_file; /* name of lock file created */
1461 char hdb_lock_buffer[12];
1466 if ((p = strrchr(dev, '/')) != NULL)
1468 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1469 lock_file = malloc(l);
1470 if (lock_file == NULL)
1471 novm("lock file name");
1472 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1474 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1476 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1477 /* Read the lock file to find out who has the device locked */
1478 n = read(fd, hdb_lock_buffer, 11);
1480 error("Can't read pid from lock file %s", lock_file);
1483 hdb_lock_buffer[n] = 0;
1484 pid = atoi(hdb_lock_buffer);
1485 if (kill(pid, 0) == -1 && errno == ESRCH) {
1486 /* pid no longer exists - remove the lock file */
1487 if (unlink(lock_file) == 0) {
1489 notice("Removed stale lock on %s (pid %d)",
1493 warn("Couldn't remove stale lock on %s",
1496 notice("Device %s is locked by pid %d",
1501 error("Can't create lock file %s: %m", lock_file);
1507 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
1508 write(fd, hdb_lock_buffer, 11);
1515 * unlock - remove our lockfile