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 1.46 1999/08/13 06:46:18 paulus Exp $"
24 /* $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
39 #include <sys/ioctl.h>
40 #include <sys/types.h>
41 #include <sys/socket.h>
44 #include <sys/param.h>
53 #include <net/ppp_defs.h>
54 #include <net/if_ppp.h>
55 #include <net/route.h>
56 #include <net/if_dl.h>
57 #include <netinet/in.h>
60 #include <sys/param.h>
61 #if defined(NetBSD) && (NetBSD >= 199703)
62 #include <netinet/if_inarp.h>
63 #else /* NetBSD 1.2D or later */
65 #include <netinet/if_ether.h>
67 #include <net/if_ether.h>
76 static const char rcsid[] = RCSID;
78 static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
79 static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
80 static int ppp_fd = -1; /* fd which is set to PPP discipline */
83 static int restore_term; /* 1 => we've munged the terminal */
84 static struct termios inittermios; /* Initial TTY termios */
85 static struct winsize wsinfo; /* Initial window size info */
87 static int loop_slave = -1;
88 static int loop_master;
89 static char loop_name[20];
91 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
93 static int sockfd; /* socket for doing interface ioctls */
95 static fd_set in_fds; /* set of fds that wait_input waits for */
96 static int max_in_fd; /* highest fd set in in_fds */
98 static int if_is_up; /* the interface is currently up */
99 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
100 static u_int32_t default_route_gateway; /* gateway addr for default route */
101 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
103 /* Prototypes for procedures local to this file. */
104 static int dodefaultroute __P((u_int32_t, int));
105 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
109 * sys_init - System-dependent initialization.
114 /* Get an internet socket for doing socket ioctl's on. */
115 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
116 fatal("Couldn't create IP socket: %m");
123 * sys_cleanup - restore any system state we modified before exiting:
124 * mark the interface down, delete default route and/or proxy arp entry.
125 * This should call die() because it's called from die().
133 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
134 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
135 && ((ifr.ifr_flags & IFF_UP) != 0)) {
136 ifr.ifr_flags &= ~IFF_UP;
137 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
141 cifaddr(0, ifaddrs[0], ifaddrs[1]);
142 if (default_route_gateway)
143 cifdefaultroute(0, 0, default_route_gateway);
145 cifproxyarp(0, proxy_arp_addr);
149 * sys_close - Clean up in a child process before execing.
155 if (loop_slave >= 0) {
162 * sys_check_options - check the options that the user specified
169 warn("DTR/CTS flow control is not supported on this system");
177 * ppp_available - check whether the system has any ppp interfaces
178 * (in fact we check whether we can do an ioctl on ppp0).
185 extern char *no_ppp_msg;
187 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
188 return 1; /* can't tell */
190 strlcpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
191 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
195 This system lacks kernel support for PPP. To include PPP support\n\
196 in the kernel, please follow the steps detailed in the README.bsd\n\
197 file in the ppp-2.2 distribution.\n";
202 * establish_ppp - Turn the serial port into a ppp interface.
208 int pppdisc = PPPDISC;
213 * Demand mode - prime the old ppp device to relinquish the unit.
215 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
216 fatal("ioctl(transfer ppp unit): %m");
220 * Save the old line discipline of fd, and set it to PPP.
222 if (ioctl(fd, TIOCGETD, &initdisc) < 0)
223 fatal("ioctl(TIOCGETD): %m");
224 if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
225 fatal("ioctl(TIOCSETD): %m");
229 * Find out which interface we were given.
231 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0)
232 fatal("ioctl(PPPIOCGUNIT): %m");
235 * Check that we got the same unit again.
237 if (ioctl(fd, PPPIOCGUNIT, &x) < 0)
238 fatal("ioctl(PPPIOCGUNIT): %m");
240 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
242 ioctl(loop_slave, TIOCSETD, &x);
248 * Enable debug in the driver if requested.
251 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
252 warn("ioctl (PPPIOCGFLAGS): %m");
254 x |= (kdebugflag & 0xFF) * SC_DEBUG;
255 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
256 warn("ioctl(PPPIOCSFLAGS): %m");
261 * Set device for non-blocking reads.
263 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
264 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
265 warn("Couldn't set device to non-blocking mode: %m");
272 * restore_loop - reattach the ppp unit to the loopback.
280 * Transfer the ppp interface back to the loopback.
282 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
283 fatal("ioctl(transfer ppp unit): %m");
285 if (ioctl(loop_slave, TIOCSETD, &x) < 0)
286 fatal("ioctl(TIOCSETD): %m");
289 * Check that we got the same unit again.
291 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
292 fatal("ioctl(PPPIOCGUNIT): %m");
294 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
300 * disestablish_ppp - Restore the serial port to normal operation.
301 * This shouldn't call die() because it's called from die().
307 /* Reset non-blocking mode on fd. */
308 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
309 warn("Couldn't restore device fd flags: %m");
312 /* Restore old line discipline. */
313 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
314 error("ioctl(TIOCSETD): %m");
322 * Check whether the link seems not to be 8-bit clean.
330 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
332 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
334 s = "bit 7 set to 1";
337 s = "bit 7 set to 0";
347 warn("Serial link is not 8-bit clean:");
348 warn("All received characters had %s", s);
354 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
355 * at the requested speed, etc. If `local' is true, set CLOCAL
356 * regardless of whether the modem option was specified.
358 * For *BSD, we assume that speed_t values numerically equal bits/second.
361 set_up_tty(fd, local)
366 if (tcgetattr(fd, &tios) < 0)
367 fatal("tcgetattr: %m");
371 ioctl(fd, TIOCGWINSZ, &wsinfo);
374 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
375 if (crtscts > 0 && !local) {
378 tios.c_cflag |= CDTRCTS;
381 tios.c_cflag |= CRTSCTS;
382 } else if (crtscts < 0) {
383 tios.c_cflag &= ~CRTSCTS;
385 tios.c_cflag &= ~CDTRCTS;
389 tios.c_cflag |= CS8 | CREAD | HUPCL;
391 tios.c_cflag |= CLOCAL;
392 tios.c_iflag = IGNBRK | IGNPAR;
396 tios.c_cc[VTIME] = 0;
399 tios.c_iflag |= IXON | IXOFF;
400 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
401 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
405 cfsetospeed(&tios, inspeed);
406 cfsetispeed(&tios, inspeed);
408 inspeed = cfgetospeed(&tios);
410 * We can't proceed if the serial port speed is 0,
411 * since that implies that the serial port is disabled.
414 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
418 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
419 fatal("tcsetattr: %m");
425 * restore_tty - restore the terminal to the saved settings.
432 if (!default_device) {
434 * Turn off echoing, because otherwise we can get into
435 * a loop with the tty and the modem echoing to each other.
436 * We presume we are the sole user of this tty device, so
437 * when we close it, it will revert to its defaults anyway.
439 inittermios.c_lflag &= ~(ECHO | ECHONL);
441 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
443 warn("tcsetattr: %m");
444 ioctl(fd, TIOCSWINSZ, &wsinfo);
450 * setdtr - control the DTR line on the serial port.
451 * This is called from die(), so it shouldn't call die().
457 int modembits = TIOCM_DTR;
459 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
463 * get_pty - get a pty master/slave pair and chown the slave side
464 * to the uid given. Assumes slave_name points to >= 12 bytes of space.
467 get_pty(master_fdp, slave_fdp, slave_name, uid)
475 if (openpty(master_fdp, slave_fdp, slave_name, NULL, NULL) < 0)
478 fchown(*slave_fdp, uid, -1);
479 fchmod(*slave_fdp, S_IRUSR | S_IWUSR);
480 if (tcgetattr(*slave_fdp, &tios) == 0) {
481 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
482 tios.c_cflag |= CS8 | CREAD;
483 tios.c_iflag = IGNPAR | CLOCAL;
486 if (tcsetattr(*slave_fdp, TCSAFLUSH, &tios) < 0)
487 warn("couldn't set attributes on pty: %m");
489 warn("couldn't get attributes on pty: %m");
496 * open_ppp_loopback - open the device we use for getting
497 * packets in demand mode, and connect it to a ppp interface.
505 int pppdisc = PPPDISC;
507 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
508 fatal("No free pty for loopback");
509 SYSDEBUG(("using %s for loopback", loop_name));
511 if (tcgetattr(loop_slave, &tios) == 0) {
512 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
513 tios.c_cflag |= CS8 | CREAD;
514 tios.c_iflag = IGNPAR;
517 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
518 warn("couldn't set attributes on loopback: %m");
521 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
522 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
523 warn("couldn't set loopback to nonblock: %m");
526 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0)
527 fatal("ioctl(TIOCSETD): %m");
530 * Find out which interface we were given.
532 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
533 fatal("ioctl(PPPIOCGUNIT): %m");
536 * Enable debug in the driver if requested.
539 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
540 warn("ioctl (PPPIOCGFLAGS): %m");
542 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
543 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
544 warn("ioctl(PPPIOCSFLAGS): %m");
553 * output - Output PPP packet.
562 dbglog("sent %P", p, len);
564 if (write(ttyfd, p, len) < 0) {
572 * wait_input - wait until there is data available,
573 * for the length of time specified by *timo (indefinite
578 struct timeval *timo;
584 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
585 if (n < 0 && errno != EINTR)
591 * add_fd - add an fd to the set that wait_input waits for.
602 * remove_fd - remove an fd from the set that wait_input waits for.
612 * wait_loop_output - wait until there is data available on the
613 * loopback, for the length of time specified by *timo (indefinite
617 wait_loop_output(timo)
618 struct timeval *timo;
624 FD_SET(loop_master, &ready);
625 n = select(loop_master + 1, &ready, NULL, &ready, timo);
626 if (n < 0 && errno != EINTR)
632 * wait_time - wait for a given length of time or until a
633 * signal is received.
637 struct timeval *timo;
641 n = select(0, NULL, NULL, NULL, timo);
642 if (n < 0 && errno != EINTR)
649 * read_packet - get a PPP packet from the serial device.
657 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
658 if (errno == EWOULDBLOCK || errno == EINTR)
667 * get_loop_output - read characters from the loopback, form them
668 * into frames, and detect when we want to bring the real link up.
669 * Return value is 1 if we need to bring up the link, 0 otherwise.
677 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
678 if (loop_chars(inbuf, n))
683 fatal("eof on loopback");
684 if (errno != EWOULDBLOCK)
685 fatal("read from loopback: %m");
692 * ppp_send_config - configure the transmit characteristics of
696 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
704 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
706 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
707 fatal("ioctl(SIOCSIFMTU): %m");
709 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
710 fatal("ioctl(PPPIOCSASYNCMAP): %m");
712 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
713 fatal("ioctl (PPPIOCGFLAGS): %m");
714 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
715 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
716 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
717 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
718 fatal("ioctl(PPPIOCSFLAGS): %m");
723 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
726 ppp_set_xaccm(unit, accm)
730 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
731 warn("ioctl(set extended ACCM): %m");
736 * ppp_recv_config - configure the receive-side characteristics of
740 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
747 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
748 fatal("ioctl(PPPIOCSMRU): %m");
749 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
750 fatal("ioctl(PPPIOCSRASYNCMAP): %m");
751 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
752 fatal("ioctl (PPPIOCGFLAGS): %m");
753 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
754 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
755 fatal("ioctl(PPPIOCSFLAGS): %m");
759 * ccp_test - ask kernel whether a given compression method
760 * is acceptable for use. Returns 1 if the method and parameters
761 * are OK, 0 if the method is known but the parameters are not OK
762 * (e.g. code size should be reduced), or -1 if the method is unknown.
765 ccp_test(unit, opt_ptr, opt_len, for_transmit)
766 int unit, opt_len, for_transmit;
769 struct ppp_option_data data;
772 data.length = opt_len;
773 data.transmit = for_transmit;
774 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
776 return (errno == ENOBUFS)? 0: -1;
780 * ccp_flags_set - inform kernel about the current state of CCP.
783 ccp_flags_set(unit, isopen, isup)
784 int unit, isopen, isup;
788 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
789 error("ioctl (PPPIOCGFLAGS): %m");
792 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
793 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
794 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
795 error("ioctl(PPPIOCSFLAGS): %m");
799 * ccp_fatal_error - returns 1 if decompression was disabled as a
800 * result of an error detected after decompression of a packet,
801 * 0 otherwise. This is necessary because of patent nonsense.
804 ccp_fatal_error(unit)
809 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
810 error("ioctl(PPPIOCGFLAGS): %m");
813 return x & SC_DC_FERROR;
817 * get_idle_time - return how long the link has been idle.
824 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
828 * get_ppp_stats - return statistics for the link.
831 get_ppp_stats(u, stats)
833 struct pppd_stats *stats;
835 struct ifpppstatsreq req;
837 memset (&req, 0, sizeof (req));
838 strlcpy(req.ifr_name, ifname, sizeof(req.ifr_name));
839 if (ioctl(sockfd, SIOCGPPPSTATS, &req) < 0) {
840 error("Couldn't get PPP statistics: %m");
843 stats->bytes_in = req.stats.p.ppp_ibytes;
844 stats->bytes_out = req.stats.p.ppp_obytes;
851 * set_filters - transfer the pass and active filters to the kernel.
854 set_filters(pass, active)
855 struct bpf_program *pass, *active;
859 if (pass->bf_len > 0) {
860 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
861 error("Couldn't set pass-filter in kernel: %m");
865 if (active->bf_len > 0) {
866 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
867 error("Couldn't set active-filter in kernel: %m");
876 * sifvjcomp - config tcp header compression
879 sifvjcomp(u, vjcomp, cidcomp, maxcid)
880 int u, vjcomp, cidcomp, maxcid;
884 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
885 error("ioctl (PPPIOCGFLAGS): %m");
888 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
889 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
890 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
891 error("ioctl(PPPIOCSFLAGS): %m");
894 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
895 error("ioctl(PPPIOCSFLAGS): %m");
902 * sifup - Config the interface up and enable IP packets to pass.
910 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
911 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
912 error("ioctl (SIOCGIFFLAGS): %m");
915 ifr.ifr_flags |= IFF_UP;
916 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
917 error("ioctl(SIOCSIFFLAGS): %m");
925 * sifnpmode - Set the mode for handling packets for a given NP.
928 sifnpmode(u, proto, mode)
935 npi.protocol = proto;
937 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
938 error("ioctl(set NP %d mode to %d): %m", proto, mode);
945 * sifdown - Config the interface down and disable IP.
956 npi.protocol = PPP_IP;
957 npi.mode = NPMODE_ERROR;
958 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
959 /* ignore errors, because ppp_fd might have been closed by now. */
961 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
962 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
963 error("ioctl (SIOCGIFFLAGS): %m");
966 ifr.ifr_flags &= ~IFF_UP;
967 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
968 error("ioctl(SIOCSIFFLAGS): %m");
977 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
980 #define SET_SA_FAMILY(addr, family) \
981 BZERO((char *) &(addr), sizeof(addr)); \
982 addr.sa_family = (family); \
983 addr.sa_len = sizeof(addr);
986 * sifaddr - Config the interface IP addresses and netmask.
993 struct ifaliasreq ifra;
996 strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
997 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
998 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
999 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1000 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1002 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
1003 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
1005 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1006 BZERO(&ifr, sizeof(ifr));
1007 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1008 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
1009 if (errno != EADDRNOTAVAIL)
1010 warn("Couldn't remove interface address: %m");
1012 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
1013 if (errno != EEXIST) {
1014 error("Couldn't set interface address: %m");
1017 warn("Couldn't set interface address: Address %I already exists", o);
1025 * cifaddr - Clear the interface IP addresses, and delete routes
1026 * through the interface if possible.
1033 struct ifaliasreq ifra;
1036 strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
1037 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1038 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1039 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1040 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1041 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1042 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
1043 if (errno != EADDRNOTAVAIL)
1044 warn("Couldn't delete interface address: %m");
1051 * sifdefaultroute - assign a default route through the address given.
1054 sifdefaultroute(u, l, g)
1058 return dodefaultroute(g, 's');
1062 * cifdefaultroute - delete a default route through the address given.
1065 cifdefaultroute(u, l, g)
1069 return dodefaultroute(g, 'c');
1073 * dodefaultroute - talk to a routing socket to add/delete a default route.
1076 dodefaultroute(g, cmd)
1082 struct rt_msghdr hdr;
1083 struct sockaddr_in dst;
1084 struct sockaddr_in gway;
1085 struct sockaddr_in mask;
1088 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1089 error("Couldn't %s default route: socket: %m",
1090 cmd=='s'? "add": "delete");
1094 memset(&rtmsg, 0, sizeof(rtmsg));
1095 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1096 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1097 rtmsg.hdr.rtm_version = RTM_VERSION;
1098 rtmsg.hdr.rtm_seq = ++rtm_seq;
1099 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1100 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1101 rtmsg.dst.sin_family = AF_INET;
1102 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1103 rtmsg.gway.sin_family = AF_INET;
1104 rtmsg.gway.sin_addr.s_addr = g;
1105 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1106 rtmsg.mask.sin_family = AF_INET;
1108 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1109 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1110 error("Couldn't %s default route: %m",
1111 cmd=='s'? "add": "delete");
1117 default_route_gateway = (cmd == 's')? g: 0;
1121 #if RTM_VERSION >= 3
1124 * sifproxyarp - Make a proxy ARP entry for the peer.
1127 struct rt_msghdr hdr;
1128 struct sockaddr_inarp dst;
1129 struct sockaddr_dl hwa;
1133 static int arpmsg_valid;
1136 sifproxyarp(unit, hisaddr)
1143 * Get the hardware address of an interface on the same subnet
1144 * as our local address.
1146 memset(&arpmsg, 0, sizeof(arpmsg));
1147 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1148 error("Cannot determine ethernet address for proxy ARP");
1152 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1153 error("Couldn't add proxy arp entry: socket: %m");
1157 arpmsg.hdr.rtm_type = RTM_ADD;
1158 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1159 arpmsg.hdr.rtm_version = RTM_VERSION;
1160 arpmsg.hdr.rtm_seq = ++rtm_seq;
1161 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1162 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1163 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1164 arpmsg.dst.sin_family = AF_INET;
1165 arpmsg.dst.sin_addr.s_addr = hisaddr;
1166 arpmsg.dst.sin_other = SIN_PROXY;
1168 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1169 + arpmsg.hwa.sdl_len;
1170 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1171 error("Couldn't add proxy arp entry: %m");
1178 proxy_arp_addr = hisaddr;
1183 * cifproxyarp - Delete the proxy ARP entry for the peer.
1186 cifproxyarp(unit, hisaddr)
1196 arpmsg.hdr.rtm_type = RTM_DELETE;
1197 arpmsg.hdr.rtm_seq = ++rtm_seq;
1199 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1200 error("Couldn't delete proxy arp entry: socket: %m");
1204 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1205 error("Couldn't delete proxy arp entry: %m");
1215 #else /* RTM_VERSION */
1218 * sifproxyarp - Make a proxy ARP entry for the peer.
1221 sifproxyarp(unit, hisaddr)
1225 struct arpreq arpreq;
1227 struct sockaddr_dl sdl;
1231 BZERO(&arpreq, sizeof(arpreq));
1234 * Get the hardware address of an interface on the same subnet
1235 * as our local address.
1237 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1238 error("Cannot determine ethernet address for proxy ARP");
1242 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1243 arpreq.arp_ha.sa_family = AF_UNSPEC;
1244 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1245 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1246 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1247 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1248 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1249 error("Couldn't add proxy arp entry: %m");
1253 proxy_arp_addr = hisaddr;
1258 * cifproxyarp - Delete the proxy ARP entry for the peer.
1261 cifproxyarp(unit, hisaddr)
1265 struct arpreq arpreq;
1267 BZERO(&arpreq, sizeof(arpreq));
1268 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1269 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1270 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1271 warn("Couldn't delete proxy arp entry: %m");
1277 #endif /* RTM_VERSION */
1281 * get_ether_addr - get the hardware address of an interface on the
1282 * the same subnet as ipaddr.
1287 get_ether_addr(ipaddr, hwaddr)
1289 struct sockaddr_dl *hwaddr;
1291 struct ifreq *ifr, *ifend, *ifp;
1292 u_int32_t ina, mask;
1293 struct sockaddr_dl *dla;
1296 struct ifreq ifs[MAX_IFS];
1298 ifc.ifc_len = sizeof(ifs);
1300 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1301 error("ioctl(SIOCGIFCONF): %m");
1306 * Scan through looking for an interface with an Internet
1307 * address on the same subnet as `ipaddr'.
1309 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1310 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1311 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1312 if (ifr->ifr_addr.sa_family == AF_INET) {
1313 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1314 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1316 * Check that the interface is up, and not point-to-point
1319 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1321 if ((ifreq.ifr_flags &
1322 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1323 != (IFF_UP|IFF_BROADCAST))
1326 * Get its netmask and check that it's on the right subnet.
1328 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1330 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1331 if ((ipaddr & mask) != (ina & mask))
1340 info("found interface %s for proxy arp", ifr->ifr_name);
1343 * Now scan through again looking for a link-level address
1344 * for this interface.
1347 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1348 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1349 && ifr->ifr_addr.sa_family == AF_LINK) {
1351 * Found the link-level address - copy it out
1353 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1354 BCOPY(dla, hwaddr, dla->sdl_len);
1357 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1364 * Return user specified netmask, modified by any mask we might determine
1365 * for address `addr' (in network byte order).
1366 * Here we scan through the system's list of interfaces, looking for
1367 * any non-point-to-point interfaces which might appear to be on the same
1368 * network as `addr'. If we find any, we OR in their netmask to the
1369 * user-specified netmask.
1375 u_int32_t mask, nmask, ina;
1376 struct ifreq *ifr, *ifend, ifreq;
1378 struct ifreq ifs[MAX_IFS];
1381 if (IN_CLASSA(addr)) /* determine network mask for address class */
1382 nmask = IN_CLASSA_NET;
1383 else if (IN_CLASSB(addr))
1384 nmask = IN_CLASSB_NET;
1386 nmask = IN_CLASSC_NET;
1387 /* class D nets are disallowed by bad_ip_adrs */
1388 mask = netmask | htonl(nmask);
1391 * Scan through the system's network interfaces.
1393 ifc.ifc_len = sizeof(ifs);
1395 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1396 warn("ioctl(SIOCGIFCONF): %m");
1399 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1400 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1401 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1403 * Check the interface's internet address.
1405 if (ifr->ifr_addr.sa_family != AF_INET)
1407 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1408 if ((ntohl(ina) & nmask) != (addr & nmask))
1411 * Check that the interface is up, and not point-to-point or loopback.
1413 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1414 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1416 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1420 * Get its netmask and OR it into our mask.
1422 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1424 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1431 * have_route_to - determine if the system has any route to
1432 * a given IP address.
1433 * For demand mode to work properly, we have to ignore routes
1434 * through our own interface.
1436 int have_route_to(u_int32_t addr)
1442 * Use the hostid as part of the random number seed.
1452 * lock - create a lock file for the named lock device
1454 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1456 static char *lock_file; /* name of lock file created */
1462 char hdb_lock_buffer[12];
1467 if ((p = strrchr(dev, '/')) != NULL)
1469 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1470 lock_file = malloc(l);
1471 if (lock_file == NULL)
1472 novm("lock file name");
1473 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1475 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1477 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1478 /* Read the lock file to find out who has the device locked */
1479 n = read(fd, hdb_lock_buffer, 11);
1481 error("Can't read pid from lock file %s", lock_file);
1484 hdb_lock_buffer[n] = 0;
1485 pid = atoi(hdb_lock_buffer);
1486 if (kill(pid, 0) == -1 && errno == ESRCH) {
1487 /* pid no longer exists - remove the lock file */
1488 if (unlink(lock_file) == 0) {
1490 notice("Removed stale lock on %s (pid %d)",
1494 warn("Couldn't remove stale lock on %s",
1497 notice("Device %s is locked by pid %d",
1502 error("Can't create lock file %s: %m", lock_file);
1508 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
1509 write(fd, hdb_lock_buffer, 11);
1516 * unlock - remove our lockfile