2 * sys-linux.c - System-dependent procedures for setting up
3 * PPP interfaces on Linux systems
5 * Copyright (c) 1994-2004 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. The name(s) of the authors of this software must not be used to
15 * endorse or promote products derived from this software without
16 * prior written permission.
18 * 3. Redistributions of any form whatsoever must retain the following
20 * "This product includes software developed by Paul Mackerras
21 * <paulus@samba.org>".
23 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
24 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
25 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
26 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
27 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
28 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
29 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
31 * Derived from main.c and pppd.h, which are:
33 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
47 * 3. The name "Carnegie Mellon University" must not be used to
48 * endorse or promote products derived from this software without
49 * prior written permission. For permission or any legal
50 * details, please contact
51 * Office of Technology Transfer
52 * Carnegie Mellon University
54 * Pittsburgh, PA 15213-3890
55 * (412) 268-4387, fax: (412) 268-7395
56 * tech-transfer@andrew.cmu.edu
58 * 4. Redistributions of any form whatsoever must retain the following
60 * "This product includes software developed by Computing Services
61 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
63 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
64 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
65 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
66 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
67 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
68 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
69 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
72 #include <sys/ioctl.h>
73 #include <sys/types.h>
74 #include <sys/socket.h>
76 #include <sys/errno.h>
79 #include <sys/utsname.h>
80 #include <sys/sysmacros.h>
96 /* This is in netdevice.h. However, this compile will fail miserably if
97 you attempt to include netdevice.h because it has so many references
98 to __memcpy functions which it should not attempt to do. So, since I
99 really don't use it, but it must be defined, define it now. */
102 #define MAX_ADDR_LEN 7
106 #include <asm/types.h> /* glibc 2 conflicts with linux/types.h */
108 #include <net/if_arp.h>
109 #include <net/route.h>
110 #include <netinet/if_ether.h>
112 #include <linux/types.h>
113 #include <linux/if.h>
114 #include <linux/if_arp.h>
115 #include <linux/route.h>
116 #include <linux/if_ether.h>
118 #include <netinet/in.h>
119 #include <arpa/inet.h>
121 #include <linux/ppp_defs.h>
122 #include <linux/if_ppp.h>
130 #if __GLIBC__ >= 2 && \
131 !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
132 #include <netipx/ipx.h>
134 #include <linux/ipx.h>
136 #endif /* IPX_CHANGE */
139 #include <pcap-bpf.h>
140 #include <linux/filter.h>
141 #endif /* PPP_FILTER */
144 #include <sys/locks.h>
150 * This is in linux/include/net/ipv6.h.
154 struct in6_addr ifr6_addr;
155 __u32 ifr6_prefixlen;
156 unsigned int ifr6_ifindex;
160 #define IN6_LLADDR_FROM_EUI64(sin6, eui64) do { \
161 memset(&sin6.s6_addr, 0, sizeof(struct in6_addr)); \
162 sin6.s6_addr16[0] = htons(0xfe80); \
163 eui64_copy(eui64, sin6.s6_addr32[2]); \
168 /* We can get an EIO error on an ioctl if the modem has hung up */
169 #define ok_error(num) ((num)==EIO)
171 static int tty_disc = N_TTY; /* The TTY discipline */
172 static int ppp_disc = N_PPP; /* The PPP discpline */
173 static int initfdflags = -1; /* Initial file descriptor flags for fd */
174 static int ppp_fd = -1; /* fd which is set to PPP discipline */
175 static int sock_fd = -1; /* socket for doing interface ioctls */
176 static int slave_fd = -1; /* pty for old-style demand mode, slave */
177 static int master_fd = -1; /* pty for old-style demand mode, master */
179 static int sock6_fd = -1;
183 * For the old-style kernel driver, this is the same as ppp_fd.
184 * For the new-style driver, it is the fd of an instance of /dev/ppp
185 * which is attached to the ppp unit and is used for controlling it.
187 int ppp_dev_fd = -1; /* fd for /dev/ppp (new style driver) */
189 static int chindex; /* channel index (new style driver) */
191 static fd_set in_fds; /* set of fds that wait_input waits for */
192 static int max_in_fd; /* highest fd set in in_fds */
194 static int has_proxy_arp = 0;
195 static int driver_version = 0;
196 static int driver_modification = 0;
197 static int driver_patch = 0;
198 static int driver_is_old = 0;
199 static int restore_term = 0; /* 1 => we've munged the terminal */
200 static struct termios inittermios; /* Initial TTY termios */
202 int new_style_driver = 0;
204 static char loop_name[20];
205 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
207 static int if_is_up; /* Interface has been marked up */
208 static int if6_is_up; /* Interface has been marked up for IPv6, to help differentiate */
209 static int have_default_route; /* Gateway for default route added */
210 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
211 static char proxy_arp_dev[16]; /* Device for proxy arp entry */
212 static u_int32_t our_old_addr; /* for detecting address changes */
213 static int dynaddr_set; /* 1 if ip_dynaddr set */
214 static int looped; /* 1 if using loop */
215 static int link_mtu; /* mtu for the link (not bundle) */
217 static struct utsname utsname; /* for the kernel version */
218 static int kernel_version;
219 #define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
223 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
224 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
225 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
227 #define SIN_ADDR(x) (((struct sockaddr_in *) (&(x)))->sin_addr.s_addr)
229 /* Prototypes for procedures local to this file. */
230 static int modify_flags(int fd, int clear_bits, int set_bits);
231 static int translate_speed (int bps);
232 static int baud_rate_of (int speed);
233 static void close_route_table (void);
234 static int open_route_table (void);
235 static int read_route_table (struct rtentry *rt);
236 static int defaultroute_exists (struct rtentry *rt);
237 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
238 char *name, int namelen);
239 static void decode_version (char *buf, int *version, int *mod, int *patch);
240 static int set_kdebugflag(int level);
241 static int ppp_registered(void);
242 static int make_ppp_unit(void);
244 extern u_char inpacket_buf[]; /* borrowed from main.c */
247 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
251 #define SET_SA_FAMILY(addr, family) \
252 memset ((char *) &(addr), '\0', sizeof(addr)); \
253 addr.sa_family = (family);
256 * Determine if the PPP connection should still be present.
261 /* new_fd is the fd of a tty */
262 static void set_ppp_fd (int new_fd)
265 if (!new_style_driver)
269 static int still_ppp(void)
271 if (new_style_driver)
272 return !hungup && ppp_fd >= 0;
273 if (!hungup || ppp_fd == slave_fd)
276 set_ppp_fd(slave_fd);
283 * modify_flags - set and clear flag bits controlling the kernel
286 static int modify_flags(int fd, int clear_bits, int set_bits)
290 if (ioctl(fd, PPPIOCGFLAGS, &flags) == -1)
292 flags = (flags & ~clear_bits) | set_bits;
293 if (ioctl(fd, PPPIOCSFLAGS, &flags) == -1)
300 error("Failed to set PPP kernel option flags: %m");
304 /********************************************************************
306 * sys_init - System-dependent initialization.
311 /* Get an internet socket for doing socket ioctls. */
312 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
314 fatal("Couldn't create IP socket: %m(%d)", errno);
317 sock6_fd = socket(AF_INET6, SOCK_DGRAM, 0);
319 sock6_fd = -errno; /* save errno for later */
326 /********************************************************************
328 * sys_cleanup - restore any system state we modified before exiting:
329 * mark the interface down, delete default route and/or proxy arp entry.
330 * This shouldn't call die() because it's called from die().
333 void sys_cleanup(void)
336 * Take down the device
346 * Delete any routes through the device.
348 if (have_default_route)
349 cifdefaultroute(0, 0, 0);
352 cifproxyarp(0, proxy_arp_addr);
355 /********************************************************************
357 * sys_close - Clean up in a child process before execing.
362 if (new_style_driver && ppp_dev_fd >= 0)
376 /********************************************************************
378 * set_kdebugflag - Define the debugging level for the kernel
381 static int set_kdebugflag (int requested_level)
385 if (ioctl(ppp_dev_fd, PPPIOCSDEBUG, &requested_level) < 0) {
386 if ( ! ok_error (errno) )
387 error("ioctl(PPPIOCSDEBUG): %m (line %d)", __LINE__);
393 /********************************************************************
395 * tty_establish_ppp - Turn the serial port into a ppp interface.
398 int tty_establish_ppp (int tty_fd)
403 * Ensure that the tty device is in exclusive mode.
405 if (ioctl(tty_fd, TIOCEXCL, 0) < 0) {
406 if ( ! ok_error ( errno ))
407 warn("Couldn't make tty exclusive: %m");
410 * Demand mode - prime the old ppp device to relinquish the unit.
412 if (!new_style_driver && looped
413 && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0) {
414 error("ioctl(transfer ppp unit): %m, line %d", __LINE__);
418 * Set the current tty to the PPP discpline
422 #define N_SYNC_PPP 14
424 ppp_disc = (new_style_driver && sync_serial)? N_SYNC_PPP: N_PPP;
425 if (ioctl(tty_fd, TIOCSETD, &ppp_disc) < 0) {
426 if ( ! ok_error (errno) ) {
427 error("Couldn't set tty to PPP discipline: %m");
432 ret_fd = generic_establish_ppp(tty_fd);
434 #define SC_RCVB (SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP)
435 #define SC_LOGB (SC_DEBUG | SC_LOG_INPKT | SC_LOG_OUTPKT | SC_LOG_RAWIN \
439 modify_flags(ppp_fd, SC_RCVB | SC_LOGB,
440 (kdebugflag * SC_DEBUG) & SC_LOGB);
442 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0 && !ok_error(errno))
443 warn("Couldn't reset tty to normal line discipline: %m");
449 /********************************************************************
451 * generic_establish_ppp - Turn the fd into a ppp interface.
453 int generic_establish_ppp (int fd)
457 if (new_style_driver) {
460 /* Open an instance of /dev/ppp and connect the channel to it */
461 if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
462 error("Couldn't get channel number: %m");
465 dbglog("using channel %d", chindex);
466 fd = open("/dev/ppp", O_RDWR);
468 error("Couldn't reopen /dev/ppp: %m");
471 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
472 if (ioctl(fd, PPPIOCATTCHAN, &chindex) < 0) {
473 error("Couldn't attach to channel %d: %m", chindex);
476 flags = fcntl(fd, F_GETFL);
477 if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
478 warn("Couldn't set /dev/ppp (channel) to nonblock: %m");
483 if (!looped && !multilink) {
485 * Create a new PPP unit.
487 if (make_ppp_unit() < 0)
492 modify_flags(ppp_dev_fd, SC_LOOP_TRAFFIC, 0);
496 if (ioctl(fd, PPPIOCCONNECT, &ifunit) < 0) {
497 error("Couldn't attach to PPP unit %d: %m", ifunit);
504 * Old-style driver: find out which interface we were given.
507 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
508 if (ok_error (errno))
510 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
512 /* Check that we got the same unit again. */
513 if (looped && x != ifunit)
514 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
518 * Fetch the initial file flags and reset blocking mode on the file.
520 initfdflags = fcntl(fd, F_GETFL);
521 if (initfdflags == -1 ||
522 fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
523 if ( ! ok_error (errno))
524 warn("Couldn't set device to non-blocking mode: %m");
529 * Enable debug in the driver if requested.
532 set_kdebugflag (kdebugflag);
544 /********************************************************************
546 * tty_disestablish_ppp - Restore the serial port to normal operation.
547 * This shouldn't call die() because it's called from die().
550 void tty_disestablish_ppp(int tty_fd)
554 * Flush the tty output buffer so that the TIOCSETD doesn't hang.
556 if (tcflush(tty_fd, TCIOFLUSH) < 0)
558 warn("tcflush failed: %m");
562 * Restore the previous line discipline
564 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
565 if ( ! ok_error (errno))
566 error("ioctl(TIOCSETD, N_TTY): %m (line %d)", __LINE__);
569 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
570 if ( ! ok_error (errno))
571 warn("ioctl(TIOCNXCL): %m (line %d)", __LINE__);
574 /* Reset non-blocking mode on fd. */
575 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
576 if ( ! ok_error (errno))
577 warn("Couldn't restore device fd flags: %m");
583 generic_disestablish_ppp(tty_fd);
586 /********************************************************************
588 * generic_disestablish_ppp - Restore device components to normal
589 * operation, and reconnect the ppp unit to the loopback if in demand
590 * mode. This shouldn't call die() because it's called from die().
592 void generic_disestablish_ppp(int dev_fd)
594 if (new_style_driver) {
598 modify_flags(ppp_dev_fd, 0, SC_LOOP_TRAFFIC);
600 } else if (!doing_multilink && ppp_dev_fd >= 0) {
602 remove_fd(ppp_dev_fd);
606 /* old-style driver */
608 set_ppp_fd(slave_fd);
615 * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
616 * Assumes new_style_driver.
618 static int make_ppp_unit()
622 if (ppp_dev_fd >= 0) {
623 dbglog("in make_ppp_unit, already had /dev/ppp open?");
626 ppp_dev_fd = open("/dev/ppp", O_RDWR);
628 fatal("Couldn't open /dev/ppp: %m");
629 flags = fcntl(ppp_dev_fd, F_GETFL);
631 || fcntl(ppp_dev_fd, F_SETFL, flags | O_NONBLOCK) == -1)
632 warn("Couldn't set /dev/ppp to nonblock: %m");
635 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
636 if (x < 0 && req_unit >= 0 && errno == EEXIST) {
637 warn("Couldn't allocate PPP unit %d as it is already in use", req_unit);
639 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
642 error("Couldn't create new ppp unit: %m");
647 * cfg_bundle - configure the existing bundle.
648 * Used in demand mode.
650 void cfg_bundle(int mrru, int mtru, int rssn, int tssn)
652 if (!new_style_driver)
655 /* set the mrru, mtu and flags */
656 if (ioctl(ppp_dev_fd, PPPIOCSMRRU, &mrru) < 0)
657 error("Couldn't set MRRU: %m");
659 modify_flags(ppp_dev_fd, SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ|SC_MULTILINK,
660 ((rssn? SC_MP_SHORTSEQ: 0) | (tssn? SC_MP_XSHORTSEQ: 0)
661 | (mrru? SC_MULTILINK: 0)));
663 /* connect up the channel */
664 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0)
665 fatal("Couldn't attach to PPP unit %d: %m", ifunit);
670 * make_new_bundle - create a new PPP unit (i.e. a bundle)
671 * and connect our channel to it. This should only get called
672 * if `multilink' was set at the time establish_ppp was called.
673 * In demand mode this uses our existing bundle instead of making
676 void make_new_bundle(int mrru, int mtru, int rssn, int tssn)
678 if (!new_style_driver)
681 /* make us a ppp unit */
682 if (make_ppp_unit() < 0)
685 /* set the mrru and flags */
686 cfg_bundle(mrru, mtru, rssn, tssn);
690 * bundle_attach - attach our link to a given PPP unit.
691 * We assume the unit is controlled by another pppd.
693 int bundle_attach(int ifnum)
697 if (!new_style_driver)
700 master_fd = open("/dev/ppp", O_RDWR);
702 fatal("Couldn't open /dev/ppp: %m");
703 if (ioctl(master_fd, PPPIOCATTACH, &ifnum) < 0) {
704 if (errno == ENXIO) {
706 return 0; /* doesn't still exist */
708 fatal("Couldn't attach to interface unit %d: %m\n", ifnum);
710 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifnum) < 0)
711 fatal("Couldn't connect to interface unit %d: %m", ifnum);
712 modify_flags(master_fd, 0, SC_MULTILINK);
720 * destroy_bundle - tell the driver to destroy our bundle.
722 void destroy_bundle(void)
724 if (ppp_dev_fd >= 0) {
726 remove_fd(ppp_dev_fd);
731 /********************************************************************
733 * clean_check - Fetch the flags for the device and generate
734 * appropriate error messages.
736 void clean_check(void)
742 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
744 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
746 s = "all had bit 7 set to 1";
750 s = "all had bit 7 set to 0";
754 s = "all had odd parity";
758 s = "all had even parity";
763 warn("Receive serial link is not 8-bit clean:");
764 warn("Problem: %s", s);
772 * List of valid speeds.
776 int speed_int, speed_val;
857 { 1000000, B1000000 },
860 { 1152000, B1152000 },
863 { 1500000, B1500000 },
866 { 2000000, B2000000 },
869 { 2500000, B2500000 },
872 { 3000000, B3000000 },
875 { 3500000, B3500000 },
878 { 4000000, B4000000 },
883 /********************************************************************
885 * Translate from bits/second to a speed_t.
888 static int translate_speed (int bps)
890 struct speed *speedp;
893 for (speedp = speeds; speedp->speed_int; speedp++) {
894 if (bps == speedp->speed_int)
895 return speedp->speed_val;
897 warn("speed %d not supported", bps);
902 /********************************************************************
904 * Translate from a speed_t to bits/second.
907 static int baud_rate_of (int speed)
909 struct speed *speedp;
912 for (speedp = speeds; speedp->speed_int; speedp++) {
913 if (speed == speedp->speed_val)
914 return speedp->speed_int;
920 /********************************************************************
922 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
923 * at the requested speed, etc. If `local' is true, set CLOCAL
924 * regardless of whether the modem option was specified.
927 void set_up_tty(int tty_fd, int local)
933 if (tcgetattr(tty_fd, &tios) < 0) {
934 if (!ok_error(errno))
935 fatal("tcgetattr: %m (line %d)", __LINE__);
942 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
943 tios.c_cflag |= CS8 | CREAD | HUPCL;
945 tios.c_iflag = IGNBRK | IGNPAR;
949 tios.c_cc[VTIME] = 0;
952 tios.c_cflag ^= (CLOCAL | HUPCL);
956 tios.c_cflag |= CRTSCTS;
960 tios.c_iflag |= IXON | IXOFF;
961 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
962 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
966 tios.c_cflag &= ~CRTSCTS;
973 speed = translate_speed(inspeed);
975 cfsetospeed (&tios, speed);
976 cfsetispeed (&tios, speed);
979 * We can't proceed if the serial port speed is B0,
980 * since that implies that the serial port is disabled.
983 speed = cfgetospeed(&tios);
985 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
988 while (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0 && !ok_error(errno))
990 fatal("tcsetattr: %m (line %d)", __LINE__);
992 baud_rate = baud_rate_of(speed);
996 /********************************************************************
998 * setdtr - control the DTR line on the serial port.
999 * This is called from die(), so it shouldn't call die().
1002 void setdtr (int tty_fd, int on)
1004 int modembits = TIOCM_DTR;
1006 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
1009 /********************************************************************
1011 * restore_tty - restore the terminal to the saved settings.
1014 void restore_tty (int tty_fd)
1019 * Turn off echoing, because otherwise we can get into
1020 * a loop with the tty and the modem echoing to each other.
1021 * We presume we are the sole user of this tty device, so
1022 * when we close it, it will revert to its defaults anyway.
1024 if (!default_device)
1025 inittermios.c_lflag &= ~(ECHO | ECHONL);
1027 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
1028 if (! ok_error (errno))
1029 warn("tcsetattr: %m (line %d)", __LINE__);
1034 /********************************************************************
1036 * output - Output PPP packet.
1039 void output (int unit, unsigned char *p, int len)
1044 dump_packet("sent", p, len);
1045 if (snoop_send_hook) snoop_send_hook(p, len);
1047 if (len < PPP_HDRLEN)
1049 if (new_style_driver) {
1052 proto = (p[0] << 8) + p[1];
1053 if (ppp_dev_fd >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
1056 if (write(fd, p, len) < 0) {
1057 if (errno == EWOULDBLOCK || errno == EAGAIN || errno == ENOBUFS
1058 || errno == ENXIO || errno == EIO || errno == EINTR)
1059 warn("write: warning: %m (%d)", errno);
1061 error("write: %m (%d)", errno);
1065 /********************************************************************
1067 * wait_input - wait until there is data available,
1068 * for the length of time specified by *timo (indefinite
1072 void wait_input(struct timeval *timo)
1079 n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
1080 if (n < 0 && errno != EINTR)
1081 fatal("select: %m");
1085 * add_fd - add an fd to the set that wait_input waits for.
1089 if (fd >= FD_SETSIZE)
1090 fatal("internal error: file descriptor too large (%d)", fd);
1091 FD_SET(fd, &in_fds);
1097 * remove_fd - remove an fd from the set that wait_input waits for.
1099 void remove_fd(int fd)
1101 FD_CLR(fd, &in_fds);
1105 /********************************************************************
1107 * read_packet - get a PPP packet from the serial device.
1110 int read_packet (unsigned char *buf)
1114 len = PPP_MRU + PPP_HDRLEN;
1115 if (new_style_driver) {
1116 *buf++ = PPP_ALLSTATIONS;
1122 nr = read(ppp_fd, buf, len);
1123 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN
1124 && errno != EIO && errno != EINTR)
1126 if (nr < 0 && errno == ENXIO)
1129 if (nr < 0 && new_style_driver && ppp_dev_fd >= 0 && !bundle_eof) {
1130 /* N.B. we read ppp_fd first since LCP packets come in there. */
1131 nr = read(ppp_dev_fd, buf, len);
1132 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN
1133 && errno != EIO && errno != EINTR)
1134 error("read /dev/ppp: %m");
1135 if (nr < 0 && errno == ENXIO)
1137 if (nr == 0 && doing_multilink) {
1138 remove_fd(ppp_dev_fd);
1142 if (new_style_driver && ppp_fd < 0 && ppp_dev_fd < 0)
1144 return (new_style_driver && nr > 0)? nr+2: nr;
1147 /********************************************************************
1149 * get_loop_output - get outgoing packets from the ppp device,
1150 * and detect when we want to bring the real link up.
1151 * Return value is 1 if we need to bring up the link, 0 otherwise.
1154 get_loop_output(void)
1159 if (new_style_driver) {
1160 while ((n = read_packet(inpacket_buf)) > 0)
1161 if (loop_frame(inpacket_buf, n))
1166 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
1167 if (loop_chars(inbuf, n))
1171 fatal("eof on loopback");
1173 if (errno != EWOULDBLOCK && errno != EAGAIN)
1174 fatal("read from loopback: %m(%d)", errno);
1180 * netif_set_mtu - set the MTU on the PPP network interface.
1183 netif_set_mtu(int unit, int mtu)
1187 memset (&ifr, '\0', sizeof (ifr));
1188 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1191 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
1192 error("ioctl(SIOCSIFMTU): %m (line %d)", __LINE__);
1196 * netif_get_mtu - get the MTU on the PPP network interface.
1199 netif_get_mtu(int unit)
1203 memset (&ifr, '\0', sizeof (ifr));
1204 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1206 if (ifunit >= 0 && ioctl(sock_fd, SIOCGIFMTU, (caddr_t) &ifr) < 0) {
1207 error("ioctl(SIOCGIFMTU): %m (line %d)", __LINE__);
1213 /********************************************************************
1215 * tty_send_config - configure the transmit characteristics of
1216 * the ppp interface.
1219 void tty_send_config(int mtu, u_int32_t asyncmap, int pcomp, int accomp)
1226 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
1227 if (errno != EIO && errno != ENOTTY)
1228 error("Couldn't set transmit async character map: %m");
1233 x = (pcomp? SC_COMP_PROT: 0) | (accomp? SC_COMP_AC: 0)
1234 | (sync_serial? SC_SYNC: 0);
1235 modify_flags(ppp_fd, SC_COMP_PROT|SC_COMP_AC|SC_SYNC, x);
1238 /********************************************************************
1240 * tty_set_xaccm - set the extended transmit ACCM for the interface.
1243 void tty_set_xaccm (ext_accm accm)
1247 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
1248 if ( ! ok_error (errno))
1249 warn("ioctl(set extended ACCM): %m (line %d)", __LINE__);
1253 /********************************************************************
1255 * tty_recv_config - configure the receive-side characteristics of
1256 * the ppp interface.
1259 void tty_recv_config(int mru, u_int32_t asyncmap, int pcomp, int accomp)
1262 * If we were called because the link has gone down then there is nothing
1263 * which may be done. Just return without incident.
1268 * Set the receiver parameters
1270 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
1271 if (errno != EIO && errno != ENOTTY)
1272 error("Couldn't set channel receive MRU: %m");
1274 if (new_style_driver && ppp_dev_fd >= 0
1275 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1276 error("Couldn't set MRU in generic PPP layer: %m");
1278 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
1279 if (errno != EIO && errno != ENOTTY)
1280 error("Couldn't set channel receive asyncmap: %m");
1284 /********************************************************************
1286 * ccp_test - ask kernel whether a given compression method
1287 * is acceptable for use.
1291 ccp_test(int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1293 struct ppp_option_data data;
1295 memset (&data, '\0', sizeof (data));
1297 data.length = opt_len;
1298 data.transmit = for_transmit;
1300 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1303 return (errno == ENOBUFS)? 0: -1;
1306 /********************************************************************
1308 * ccp_flags_set - inform kernel about the current state of CCP.
1311 void ccp_flags_set (int unit, int isopen, int isup)
1315 x = (isopen? SC_CCP_OPEN: 0) | (isup? SC_CCP_UP: 0);
1316 if (still_ppp() && ppp_dev_fd >= 0)
1317 modify_flags(ppp_dev_fd, SC_CCP_OPEN|SC_CCP_UP, x);
1322 * set_filters - set the active and pass filters in the kernel driver.
1324 int set_filters(struct bpf_program *pass, struct bpf_program *active)
1326 struct sock_fprog fp;
1328 fp.len = pass->bf_len;
1329 fp.filter = (struct sock_filter *) pass->bf_insns;
1330 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) {
1331 if (errno == ENOTTY)
1332 warn("kernel does not support PPP filtering");
1334 error("Couldn't set pass-filter in kernel: %m");
1337 fp.len = active->bf_len;
1338 fp.filter = (struct sock_filter *) active->bf_insns;
1339 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) {
1340 error("Couldn't set active-filter in kernel: %m");
1345 #endif /* PPP_FILTER */
1347 /********************************************************************
1349 * get_idle_time - return how long the link has been idle.
1352 get_idle_time(u, ip)
1354 struct ppp_idle *ip;
1356 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
1359 /********************************************************************
1361 * get_ppp_stats - return statistics for the link.
1364 get_ppp_stats(u, stats)
1366 struct pppd_stats *stats;
1368 struct ifpppstatsreq req;
1370 memset (&req, 0, sizeof (req));
1372 req.stats_ptr = (caddr_t) &req.stats;
1373 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
1374 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
1375 error("Couldn't get PPP statistics: %m");
1378 stats->bytes_in = req.stats.p.ppp_ibytes;
1379 stats->bytes_out = req.stats.p.ppp_obytes;
1380 stats->pkts_in = req.stats.p.ppp_ipackets;
1381 stats->pkts_out = req.stats.p.ppp_opackets;
1385 /********************************************************************
1387 * ccp_fatal_error - returns 1 if decompression was disabled as a
1388 * result of an error detected after decompression of a packet,
1389 * 0 otherwise. This is necessary because of patent nonsense.
1392 int ccp_fatal_error (int unit)
1396 if (ioctl(ppp_dev_fd, PPPIOCGFLAGS, &flags) < 0) {
1397 error("Couldn't read compression error flags: %m");
1400 return flags & SC_DC_FERROR;
1403 /********************************************************************
1405 * path_to_procfs - find the path to the proc file system mount point
1407 static char proc_path[MAXPATHLEN];
1408 static int proc_path_len;
1410 static char *path_to_procfs(const char *tail)
1412 struct mntent *mntent;
1415 if (proc_path_len == 0) {
1416 /* Default the mount location of /proc */
1417 strlcpy (proc_path, "/proc", sizeof(proc_path));
1419 fp = fopen(MOUNTED, "r");
1421 while ((mntent = getmntent(fp)) != NULL) {
1422 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1424 if (strcmp(mntent->mnt_type, "proc") == 0) {
1425 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path));
1426 proc_path_len = strlen(proc_path);
1434 strlcpy(proc_path + proc_path_len, tail,
1435 sizeof(proc_path) - proc_path_len);
1440 * /proc/net/route parsing stuff.
1442 #define ROUTE_MAX_COLS 12
1443 FILE *route_fd = (FILE *) 0;
1444 static char route_buffer[512];
1445 static int route_dev_col, route_dest_col, route_gw_col;
1446 static int route_flags_col, route_mask_col;
1447 static int route_num_cols;
1449 static int open_route_table (void);
1450 static void close_route_table (void);
1451 static int read_route_table (struct rtentry *rt);
1453 /********************************************************************
1455 * close_route_table - close the interface to the route table
1458 static void close_route_table (void)
1460 if (route_fd != (FILE *) 0) {
1462 route_fd = (FILE *) 0;
1466 /********************************************************************
1468 * open_route_table - open the interface to the route table
1470 static char route_delims[] = " \t\n";
1472 static int open_route_table (void)
1476 close_route_table();
1478 path = path_to_procfs("/net/route");
1479 route_fd = fopen (path, "r");
1480 if (route_fd == NULL) {
1481 error("can't open routing table %s: %m", path);
1485 route_dev_col = 0; /* default to usual columns */
1488 route_flags_col = 3;
1492 /* parse header line */
1493 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1494 char *p = route_buffer, *q;
1496 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1498 if ((q = strtok(p, route_delims)) == 0)
1500 if (strcasecmp(q, "iface") == 0)
1501 route_dev_col = col;
1502 else if (strcasecmp(q, "destination") == 0)
1503 route_dest_col = col;
1504 else if (strcasecmp(q, "gateway") == 0)
1506 else if (strcasecmp(q, "flags") == 0)
1507 route_flags_col = col;
1508 else if (strcasecmp(q, "mask") == 0)
1509 route_mask_col = col;
1512 if (used && col >= route_num_cols)
1513 route_num_cols = col + 1;
1521 /********************************************************************
1523 * read_route_table - read the next entry from the route table
1526 static int read_route_table(struct rtentry *rt)
1528 char *cols[ROUTE_MAX_COLS], *p;
1531 memset (rt, '\0', sizeof (struct rtentry));
1533 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1537 for (col = 0; col < route_num_cols; ++col) {
1538 cols[col] = strtok(p, route_delims);
1539 if (cols[col] == NULL)
1540 return 0; /* didn't get enough columns */
1544 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
1545 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
1546 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
1548 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1549 rt->rt_dev = cols[route_dev_col];
1554 /********************************************************************
1556 * defaultroute_exists - determine if there is a default route
1559 static int defaultroute_exists (struct rtentry *rt)
1563 if (!open_route_table())
1566 while (read_route_table(rt) != 0) {
1567 if ((rt->rt_flags & RTF_UP) == 0)
1570 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
1572 if (SIN_ADDR(rt->rt_dst) == 0L) {
1578 close_route_table();
1583 * have_route_to - determine if the system has any route to
1584 * a given IP address. `addr' is in network byte order.
1585 * Return value is 1 if yes, 0 if no, -1 if don't know.
1586 * For demand mode to work properly, we have to ignore routes
1587 * through our own interface.
1589 int have_route_to(u_int32_t addr)
1594 if (!open_route_table())
1595 return -1; /* don't know */
1597 while (read_route_table(&rt)) {
1598 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1600 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) {
1606 close_route_table();
1610 /********************************************************************
1612 * sifdefaultroute - assign a default route through the address given.
1615 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1619 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1620 if (rt.rt_flags & RTF_GATEWAY)
1621 error("not replacing existing default route via %I",
1622 SIN_ADDR(rt.rt_gateway));
1624 error("not replacing existing default route through %s",
1629 memset (&rt, 0, sizeof (rt));
1630 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1634 if (kernel_version > KVERSION(2,1,0)) {
1635 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1636 SIN_ADDR(rt.rt_genmask) = 0L;
1639 rt.rt_flags = RTF_UP;
1640 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1641 if ( ! ok_error ( errno ))
1642 error("default route ioctl(SIOCADDRT): %m");
1646 have_default_route = 1;
1650 /********************************************************************
1652 * cifdefaultroute - delete a default route through the address given.
1655 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1659 have_default_route = 0;
1661 memset (&rt, '\0', sizeof (rt));
1662 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1663 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1667 if (kernel_version > KVERSION(2,1,0)) {
1668 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1669 SIN_ADDR(rt.rt_genmask) = 0L;
1672 rt.rt_flags = RTF_UP;
1673 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1675 if ( ! ok_error ( errno ))
1676 error("default route ioctl(SIOCDELRT): %m");
1684 /********************************************************************
1686 * sifproxyarp - Make a proxy ARP entry for the peer.
1689 int sifproxyarp (int unit, u_int32_t his_adr)
1691 struct arpreq arpreq;
1694 if (has_proxy_arp == 0) {
1695 memset (&arpreq, '\0', sizeof(arpreq));
1697 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1698 SIN_ADDR(arpreq.arp_pa) = his_adr;
1699 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1701 * Get the hardware address of an interface on the same subnet
1702 * as our local address.
1704 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1705 sizeof(proxy_arp_dev))) {
1706 error("Cannot determine ethernet address for proxy ARP");
1709 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1711 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1712 if ( ! ok_error ( errno ))
1713 error("ioctl(SIOCSARP): %m");
1716 proxy_arp_addr = his_adr;
1720 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward");
1721 if (forw_path != 0) {
1722 int fd = open(forw_path, O_WRONLY);
1724 if (write(fd, "1", 1) != 1)
1725 error("Couldn't enable IP forwarding: %m");
1735 /********************************************************************
1737 * cifproxyarp - Delete the proxy ARP entry for the peer.
1740 int cifproxyarp (int unit, u_int32_t his_adr)
1742 struct arpreq arpreq;
1744 if (has_proxy_arp) {
1746 memset (&arpreq, '\0', sizeof(arpreq));
1747 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1748 SIN_ADDR(arpreq.arp_pa) = his_adr;
1749 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1750 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1752 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1753 if ( ! ok_error ( errno ))
1754 warn("ioctl(SIOCDARP): %m");
1761 /********************************************************************
1763 * get_ether_addr - get the hardware address of an interface on the
1764 * the same subnet as ipaddr.
1767 static int get_ether_addr (u_int32_t ipaddr,
1768 struct sockaddr *hwaddr,
1769 char *name, int namelen)
1771 struct ifreq *ifr, *ifend;
1772 u_int32_t ina, mask;
1774 struct ifreq ifreq, bestifreq;
1776 struct ifreq ifs[MAX_IFS];
1778 u_int32_t bestmask=0;
1779 int found_interface = 0;
1781 ifc.ifc_len = sizeof(ifs);
1783 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1784 if ( ! ok_error ( errno ))
1785 error("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1790 * Scan through looking for an interface with an Internet
1791 * address on the same subnet as `ipaddr'.
1793 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1794 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1795 if (ifr->ifr_addr.sa_family == AF_INET) {
1796 ina = SIN_ADDR(ifr->ifr_addr);
1797 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1799 * Check that the interface is up, and not point-to-point
1802 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1805 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1808 * Get its netmask and check that it's on the right subnet.
1810 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1813 mask = SIN_ADDR(ifreq.ifr_addr);
1815 if (((ipaddr ^ ina) & mask) != 0)
1816 continue; /* no match */
1818 if (mask >= bestmask) {
1819 /* Compare using >= instead of > -- it is possible for
1820 an interface to have a netmask of 0.0.0.0 */
1821 found_interface = 1;
1828 if (!found_interface) return 0;
1830 strlcpy(name, bestifreq.ifr_name, namelen);
1832 /* trim off the :1 in eth0:1 */
1833 aliasp = strchr(name, ':');
1837 info("found interface %s for proxy arp", name);
1839 * Now get the hardware address.
1841 memset (&bestifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1842 if (ioctl (sock_fd, SIOCGIFHWADDR, &bestifreq) < 0) {
1843 error("SIOCGIFHWADDR(%s): %m", bestifreq.ifr_name);
1848 &bestifreq.ifr_hwaddr,
1849 sizeof (struct sockaddr));
1855 * get_if_hwaddr - get the hardware address for the specified
1856 * network interface device.
1859 get_if_hwaddr(u_char *addr, char *name)
1864 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
1867 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
1868 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
1869 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
1872 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
1877 * get_first_ethernet - return the name of the first ethernet-style
1878 * interface on this system.
1881 get_first_ethernet()
1886 /********************************************************************
1888 * Return user specified netmask, modified by any mask we might determine
1889 * for address `addr' (in network byte order).
1890 * Here we scan through the system's list of interfaces, looking for
1891 * any non-point-to-point interfaces which might appear to be on the same
1892 * network as `addr'. If we find any, we OR in their netmask to the
1893 * user-specified netmask.
1896 u_int32_t GetMask (u_int32_t addr)
1898 u_int32_t mask, nmask, ina;
1899 struct ifreq *ifr, *ifend, ifreq;
1901 struct ifreq ifs[MAX_IFS];
1905 if (IN_CLASSA(addr)) /* determine network mask for address class */
1906 nmask = IN_CLASSA_NET;
1907 else if (IN_CLASSB(addr))
1908 nmask = IN_CLASSB_NET;
1910 nmask = IN_CLASSC_NET;
1912 /* class D nets are disallowed by bad_ip_adrs */
1913 mask = netmask | htonl(nmask);
1915 * Scan through the system's network interfaces.
1917 ifc.ifc_len = sizeof(ifs);
1919 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1920 if ( ! ok_error ( errno ))
1921 warn("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1925 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1926 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1928 * Check the interface's internet address.
1930 if (ifr->ifr_addr.sa_family != AF_INET)
1932 ina = SIN_ADDR(ifr->ifr_addr);
1933 if (((ntohl(ina) ^ addr) & nmask) != 0)
1936 * Check that the interface is up, and not point-to-point nor loopback.
1938 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1939 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1942 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1945 * Get its netmask and OR it into our mask.
1947 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1949 mask |= SIN_ADDR(ifreq.ifr_addr);
1955 /********************************************************************
1957 * Internal routine to decode the version.modification.patch level
1960 static void decode_version (char *buf, int *version,
1961 int *modification, int *patch)
1965 *version = (int) strtoul (buf, &endp, 10);
1969 if (endp != buf && *endp == '.') {
1971 *modification = (int) strtoul (buf, &endp, 10);
1972 if (endp != buf && *endp == '.') {
1974 *patch = (int) strtoul (buf, &buf, 10);
1979 /********************************************************************
1981 * Procedure to determine if the PPP line discipline is registered.
1985 ppp_registered(void)
1993 * We used to open the serial device and set it to the ppp line
1994 * discipline here, in order to create a ppp unit. But that is
1995 * not a good idea - the user might have specified a device that
1996 * they can't open (permission, or maybe it doesn't really exist).
1997 * So we grab a pty master/slave pair and use that.
1999 if (!get_pty(&mfd, &local_fd, slave, 0)) {
2000 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
2005 * Try to put the device into the PPP discipline.
2007 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
2008 error("ioctl(TIOCSETD(PPP)): %m (line %d)", __LINE__);
2017 /********************************************************************
2019 * ppp_available - check whether the system has any ppp interfaces
2020 * (in fact we check whether we can do an ioctl on ppp0).
2023 int ppp_available(void)
2028 int my_version, my_modification, my_patch;
2029 int osmaj, osmin, ospatch;
2031 /* get the kernel version now, since we are called before sys_init */
2033 osmaj = osmin = ospatch = 0;
2034 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
2035 kernel_version = KVERSION(osmaj, osmin, ospatch);
2037 fd = open("/dev/ppp", O_RDWR);
2039 new_style_driver = 1;
2041 /* XXX should get from driver */
2043 driver_modification = 4;
2049 if (kernel_version >= KVERSION(2,3,13)) {
2050 error("Couldn't open the /dev/ppp device: %m");
2051 if (errno == ENOENT)
2053 "You need to create the /dev/ppp device node by\n"
2054 "executing the following command as root:\n"
2055 " mknod /dev/ppp c 108 0\n";
2056 else if (errno == ENODEV || errno == ENXIO)
2058 "Please load the ppp_generic kernel module.\n";
2062 /* we are running on a really really old kernel */
2064 "This system lacks kernel support for PPP. This could be because\n"
2065 "the PPP kernel module could not be loaded, or because PPP was not\n"
2066 "included in the kernel configuration. If PPP was included as a\n"
2067 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
2068 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
2069 "See README.linux file in the ppp distribution for more details.\n";
2072 * Open a socket for doing the ioctl operations.
2074 s = socket(AF_INET, SOCK_DGRAM, 0);
2078 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2079 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2081 * If the device did not exist then attempt to create one by putting the
2082 * current tty into the PPP discipline. If this works then obtain the
2083 * flags for the device again.
2086 if (ppp_registered()) {
2087 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2088 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2092 * Ensure that the hardware address is for PPP and not something else
2095 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
2097 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
2101 * This is the PPP device. Validate the version of the driver at this
2102 * point to ensure that this program will work with the driver.
2105 char abBuffer [1024];
2107 ifr.ifr_data = abBuffer;
2108 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
2110 error("Couldn't read driver version: %m");
2112 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
2115 decode_version(abBuffer,
2117 &driver_modification,
2120 * Validate the version of the driver against the version that we used.
2122 decode_version(VERSION,
2127 /* The version numbers must match */
2128 if (driver_version != my_version)
2131 /* The modification levels must be legal */
2132 if (driver_modification < 3) {
2133 if (driver_modification >= 2) {
2134 /* we can cope with 2.2.0 and above */
2143 slprintf(route_buffer, sizeof(route_buffer),
2144 "Sorry - PPP driver version %d.%d.%d is out of date\n",
2145 driver_version, driver_modification, driver_patch);
2147 no_ppp_msg = route_buffer;
2154 #ifndef HAVE_LOGWTMP
2155 /********************************************************************
2157 * Update the wtmp file with the appropriate user name and tty device.
2160 void logwtmp (const char *line, const char *name, const char *host)
2162 struct utmp ut, *utp;
2163 pid_t mypid = getpid();
2169 * Update the signon database for users.
2170 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
2172 utmpname(_PATH_UTMP);
2174 while ((utp = getutent()) && (utp->ut_pid != mypid))
2178 memcpy(&ut, utp, sizeof(ut));
2180 /* some gettys/telnetds don't initialize utmp... */
2181 memset(&ut, 0, sizeof(ut));
2183 if (ut.ut_id[0] == 0)
2184 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
2186 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
2187 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
2191 ut.ut_type = USER_PROCESS;
2194 /* Insert the host name if one is supplied */
2196 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
2198 /* Insert the IP address of the remote system if IP is enabled */
2199 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
2200 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
2201 sizeof(ut.ut_addr));
2203 /* CL: Makes sure that the logout works */
2204 if (*host == 0 && *name==0)
2210 * Update the wtmp file.
2213 updwtmp(_PATH_WTMP, &ut);
2215 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
2217 flock(wtmp, LOCK_EX);
2219 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut))
2220 warn("error writing %s: %m", _PATH_WTMP);
2222 flock(wtmp, LOCK_UN);
2228 #endif /* HAVE_LOGWTMP */
2230 /********************************************************************
2232 * sifvjcomp - config tcp header compression
2235 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2240 if (ioctl(ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
2241 error("Couldn't set up TCP header compression: %m");
2246 x = (vjcomp? SC_COMP_TCP: 0) | (cidcomp? 0: SC_NO_TCP_CCID);
2247 modify_flags(ppp_dev_fd, SC_COMP_TCP|SC_NO_TCP_CCID, x);
2252 /********************************************************************
2254 * sifup - Config the interface up and enable IP packets to pass.
2261 if ((ret = setifstate(u, 1)))
2267 /********************************************************************
2269 * sifdown - Disable the indicated protocol and config the interface
2270 * down if there are no remaining protocols.
2275 if (if_is_up && --if_is_up > 0)
2283 return setifstate(u, 0);
2287 /********************************************************************
2289 * sif6up - Config the interface up for IPv6
2296 if ((ret = setifstate(u, 1)))
2302 /********************************************************************
2304 * sif6down - Disable the IPv6CP protocol and config the interface
2305 * down if there are no remaining protocols.
2308 int sif6down (int u)
2315 return setifstate(u, 0);
2319 /********************************************************************
2321 * setifstate - Config the interface up or down
2324 int setifstate (int u, int state)
2328 memset (&ifr, '\0', sizeof (ifr));
2329 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2330 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2331 if (! ok_error (errno))
2332 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2337 ifr.ifr_flags |= IFF_UP;
2339 ifr.ifr_flags &= ~IFF_UP;
2340 ifr.ifr_flags |= IFF_POINTOPOINT;
2341 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2342 if (! ok_error (errno))
2343 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2349 /********************************************************************
2351 * sifaddr - Config the interface IP addresses and netmask.
2354 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2360 memset (&ifr, '\0', sizeof (ifr));
2361 memset (&rt, '\0', sizeof (rt));
2363 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2364 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2365 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2367 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2369 * Set our IP address
2371 SIN_ADDR(ifr.ifr_addr) = our_adr;
2372 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2373 if (errno != EEXIST) {
2374 if (! ok_error (errno))
2375 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2378 warn("ioctl(SIOCSIFADDR): Address already exists");
2383 * Set the gateway address
2386 SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
2387 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2388 if (! ok_error (errno))
2389 error("ioctl(SIOCSIFDSTADDR): %m (line %d)", __LINE__);
2395 * For recent kernels, force the netmask to 255.255.255.255.
2397 if (kernel_version >= KVERSION(2,1,16))
2399 if (net_mask != 0) {
2400 SIN_ADDR(ifr.ifr_netmask) = net_mask;
2401 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2402 if (! ok_error (errno))
2403 error("ioctl(SIOCSIFNETMASK): %m (line %d)", __LINE__);
2408 * Add the device route
2410 if (kernel_version < KVERSION(2,1,16)) {
2411 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2412 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2415 SIN_ADDR(rt.rt_gateway) = 0L;
2416 SIN_ADDR(rt.rt_dst) = his_adr;
2417 rt.rt_flags = RTF_UP | RTF_HOST;
2419 if (kernel_version > KVERSION(2,1,0)) {
2420 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2421 SIN_ADDR(rt.rt_genmask) = -1L;
2424 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2425 if (! ok_error (errno))
2426 error("ioctl(SIOCADDRT) device route: %m (line %d)", __LINE__);
2431 /* set ip_dynaddr in demand mode if address changes */
2432 if (demand && tune_kernel && !dynaddr_set
2433 && our_old_addr && our_old_addr != our_adr) {
2434 /* set ip_dynaddr if possible */
2438 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
2439 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
2440 if (write(fd, "1", 1) != 1)
2441 error("Couldn't enable dynamic IP addressing: %m");
2444 dynaddr_set = 1; /* only 1 attempt */
2451 /********************************************************************
2453 * cifaddr - Clear the interface IP addresses, and delete routes
2454 * through the interface if possible.
2457 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2461 if (kernel_version < KVERSION(2,1,16)) {
2463 * Delete the route through the device
2466 memset (&rt, '\0', sizeof (rt));
2468 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2469 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2472 SIN_ADDR(rt.rt_gateway) = 0;
2473 SIN_ADDR(rt.rt_dst) = his_adr;
2474 rt.rt_flags = RTF_UP | RTF_HOST;
2476 if (kernel_version > KVERSION(2,1,0)) {
2477 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2478 SIN_ADDR(rt.rt_genmask) = -1L;
2481 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2482 if (still_ppp() && ! ok_error (errno))
2483 error("ioctl(SIOCDELRT) device route: %m (line %d)", __LINE__);
2488 /* This way it is possible to have an IPX-only or IPv6-only interface */
2489 memset(&ifr, 0, sizeof(ifr));
2490 SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
2491 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2493 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2494 if (! ok_error (errno)) {
2495 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2500 our_old_addr = our_adr;
2506 /********************************************************************
2508 * sif6addr - Config the interface with an IPv6 link-local address
2510 int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2512 struct in6_ifreq ifr6;
2514 struct in6_rtmsg rt6;
2518 error("IPv6 socket creation failed: %m");
2521 memset(&ifr, 0, sizeof (ifr));
2522 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2523 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2524 error("sif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2528 /* Local interface */
2529 memset(&ifr6, 0, sizeof(ifr6));
2530 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2531 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2532 ifr6.ifr6_prefixlen = 10;
2534 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
2535 error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2539 /* Route to remote host */
2540 memset(&rt6, 0, sizeof(rt6));
2541 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
2542 rt6.rtmsg_flags = RTF_UP;
2543 rt6.rtmsg_dst_len = 10;
2544 rt6.rtmsg_ifindex = ifr.ifr_ifindex;
2545 rt6.rtmsg_metric = 1;
2547 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
2548 error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
2556 /********************************************************************
2558 * cif6addr - Remove IPv6 address from interface
2560 int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2563 struct in6_ifreq ifr6;
2567 error("IPv6 socket creation failed: %m");
2570 memset(&ifr, 0, sizeof(ifr));
2571 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2572 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2573 error("cif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2577 memset(&ifr6, 0, sizeof(ifr6));
2578 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2579 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2580 ifr6.ifr6_prefixlen = 10;
2582 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
2583 if (errno != EADDRNOTAVAIL) {
2584 if (! ok_error (errno))
2585 error("cif6addr: ioctl(SIOCDIFADDR): %m (line %d)", __LINE__);
2588 warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
2597 * get_pty - get a pty master/slave pair and chown the slave side
2598 * to the uid given. Assumes slave_name points to >= 16 bytes of space.
2601 get_pty(master_fdp, slave_fdp, slave_name, uid)
2607 int i, mfd, sfd = -1;
2609 struct termios tios;
2613 * Try the unix98 way first.
2615 mfd = open("/dev/ptmx", O_RDWR);
2618 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
2619 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
2620 chmod(pty_name, S_IRUSR | S_IWUSR);
2623 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
2624 warn("Couldn't unlock pty slave %s: %m", pty_name);
2626 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0)
2627 warn("Couldn't open pty slave %s: %m", pty_name);
2630 #endif /* TIOCGPTN */
2633 /* the old way - scan through the pty name space */
2634 for (i = 0; i < 64; ++i) {
2635 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2636 'p' + i / 16, i % 16);
2637 mfd = open(pty_name, O_RDWR, 0);
2640 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2642 fchown(sfd, uid, -1);
2643 fchmod(sfd, S_IRUSR | S_IWUSR);
2654 strlcpy(slave_name, pty_name, 16);
2657 if (tcgetattr(sfd, &tios) == 0) {
2658 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2659 tios.c_cflag |= CS8 | CREAD | CLOCAL;
2660 tios.c_iflag = IGNPAR;
2663 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2664 warn("couldn't set attributes on pty: %m");
2666 warn("couldn't get attributes on pty: %m");
2671 /********************************************************************
2673 * open_loopback - open the device we use for getting packets
2674 * in demand mode. Under Linux, we use a pty master/slave pair.
2677 open_ppp_loopback(void)
2682 if (new_style_driver) {
2683 /* allocate ourselves a ppp unit */
2684 if (make_ppp_unit() < 0)
2686 modify_flags(ppp_dev_fd, 0, SC_LOOP_TRAFFIC);
2687 set_kdebugflag(kdebugflag);
2692 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2693 fatal("No free pty for loopback");
2695 set_ppp_fd(slave_fd);
2697 flags = fcntl(master_fd, F_GETFL);
2699 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2700 warn("couldn't set master loopback to nonblock: %m");
2702 flags = fcntl(ppp_fd, F_GETFL);
2704 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2705 warn("couldn't set slave loopback to nonblock: %m");
2707 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2708 fatal("ioctl(TIOCSETD): %m (line %d)", __LINE__);
2710 * Find out which interface we were given.
2712 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2713 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
2715 * Enable debug in the driver if requested.
2717 set_kdebugflag (kdebugflag);
2722 /********************************************************************
2724 * sifnpmode - Set the mode for handling packets for a given NP.
2728 sifnpmode(u, proto, mode)
2735 npi.protocol = proto;
2737 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2738 if (! ok_error (errno))
2739 error("ioctl(PPPIOCSNPMODE, %d, %d): %m", proto, mode);
2746 /********************************************************************
2748 * sipxfaddr - Config the interface IPX networknumber
2751 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2758 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2760 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2762 if (! ok_error (errno))
2763 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2767 memset (&ifr, '\0', sizeof (ifr));
2768 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2770 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2771 sipx->sipx_family = AF_IPX;
2772 sipx->sipx_port = 0;
2773 sipx->sipx_network = htonl (network);
2774 sipx->sipx_type = IPX_FRAME_ETHERII;
2775 sipx->sipx_action = IPX_CRTITF;
2777 * Set the IPX device
2779 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2781 if (errno != EEXIST) {
2782 if (! ok_error (errno))
2783 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (line %d)", __LINE__);
2786 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2795 /********************************************************************
2797 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2798 * are removed and the device is no longer able to pass IPX
2802 int cipxfaddr (int unit)
2809 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2811 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2813 if (! ok_error (errno))
2814 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2818 memset (&ifr, '\0', sizeof (ifr));
2819 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2821 sipx->sipx_type = IPX_FRAME_ETHERII;
2822 sipx->sipx_action = IPX_DLTITF;
2823 sipx->sipx_family = AF_IPX;
2825 * Set the IPX device
2827 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2828 if (! ok_error (errno))
2829 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (line %d)", __LINE__);
2839 * Use the hostname as part of the random number seed.
2848 for (p = hostname; *p != 0; ++p)
2853 /********************************************************************
2855 * sys_check_options - check the options that the user specified
2859 sys_check_options(void)
2863 * Disable the IPX protocol if the support is not present in the kernel.
2867 if (ipxcp_protent.enabled_flag) {
2868 struct stat stat_buf;
2869 if ( ((path = path_to_procfs("/net/ipx/interface")) == NULL
2870 && (path = path_to_procfs("/net/ipx_interface")) == NULL)
2871 || lstat(path, &stat_buf) < 0) {
2872 error("IPX support is not present in the kernel\n");
2873 ipxcp_protent.enabled_flag = 0;
2877 if (demand && driver_is_old) {
2878 option_error("demand dialling is not supported by kernel driver "
2879 "version %d.%d.%d", driver_version, driver_modification,
2883 if (multilink && !new_style_driver) {
2884 warn("Warning: multilink is not supported by the kernel driver");
2892 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
2894 * convert the 48-bit MAC address of eth0 into EUI 64. caller also assumes
2895 * that the system has a properly configured Ethernet interface for this
2896 * function to return non-zero.
2899 ether_to_eui64(eui64_t *p_eui64)
2903 const unsigned char *ptr;
2905 skfd = socket(PF_INET6, SOCK_DGRAM, 0);
2908 warn("could not open IPv6 socket");
2912 strcpy(ifr.ifr_name, "eth0");
2913 if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
2916 warn("could not obtain hardware address for eth0");
2922 * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
2924 ptr = (unsigned char *) ifr.ifr_hwaddr.sa_data;
2925 p_eui64->e8[0] = ptr[0] | 0x02;
2926 p_eui64->e8[1] = ptr[1];
2927 p_eui64->e8[2] = ptr[2];
2928 p_eui64->e8[3] = 0xFF;
2929 p_eui64->e8[4] = 0xFE;
2930 p_eui64->e8[5] = ptr[3];
2931 p_eui64->e8[6] = ptr[4];
2932 p_eui64->e8[7] = ptr[5];