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 have_default_route; /* Gateway for default route added */
209 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
210 static char proxy_arp_dev[16]; /* Device for proxy arp entry */
211 static u_int32_t our_old_addr; /* for detecting address changes */
212 static int dynaddr_set; /* 1 if ip_dynaddr set */
213 static int looped; /* 1 if using loop */
214 static int link_mtu; /* mtu for the link (not bundle) */
216 static struct utsname utsname; /* for the kernel version */
217 static int kernel_version;
218 #define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
222 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
223 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
224 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
226 #define SIN_ADDR(x) (((struct sockaddr_in *) (&(x)))->sin_addr.s_addr)
228 /* Prototypes for procedures local to this file. */
229 static int modify_flags(int fd, int clear_bits, int set_bits);
230 static int translate_speed (int bps);
231 static int baud_rate_of (int speed);
232 static void close_route_table (void);
233 static int open_route_table (void);
234 static int read_route_table (struct rtentry *rt);
235 static int defaultroute_exists (struct rtentry *rt, int metric);
236 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
237 char *name, int namelen);
238 static void decode_version (char *buf, int *version, int *mod, int *patch);
239 static int set_kdebugflag(int level);
240 static int ppp_registered(void);
241 static int make_ppp_unit(void);
243 extern u_char inpacket_buf[]; /* borrowed from main.c */
245 extern int dfl_route_metric;
248 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
252 #define SET_SA_FAMILY(addr, family) \
253 memset ((char *) &(addr), '\0', sizeof(addr)); \
254 addr.sa_family = (family);
257 * Determine if the PPP connection should still be present.
262 /* new_fd is the fd of a tty */
263 static void set_ppp_fd (int new_fd)
266 if (!new_style_driver)
270 static int still_ppp(void)
272 if (new_style_driver)
273 return !hungup && ppp_fd >= 0;
274 if (!hungup || ppp_fd == slave_fd)
277 set_ppp_fd(slave_fd);
284 * modify_flags - set and clear flag bits controlling the kernel
287 static int modify_flags(int fd, int clear_bits, int set_bits)
291 if (ioctl(fd, PPPIOCGFLAGS, &flags) == -1)
293 flags = (flags & ~clear_bits) | set_bits;
294 if (ioctl(fd, PPPIOCSFLAGS, &flags) == -1)
301 error("Failed to set PPP kernel option flags: %m");
305 /********************************************************************
307 * sys_init - System-dependent initialization.
312 /* Get an internet socket for doing socket ioctls. */
313 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
315 fatal("Couldn't create IP socket: %m(%d)", errno);
318 sock6_fd = socket(AF_INET6, SOCK_DGRAM, 0);
320 sock6_fd = -errno; /* save errno for later */
327 /********************************************************************
329 * sys_cleanup - restore any system state we modified before exiting:
330 * mark the interface down, delete default route and/or proxy arp entry.
331 * This shouldn't call die() because it's called from die().
334 void sys_cleanup(void)
337 * Take down the device
344 * Delete any routes through the device.
346 if (have_default_route)
347 cifdefaultroute(0, 0, 0);
350 cifproxyarp(0, proxy_arp_addr);
353 /********************************************************************
355 * sys_close - Clean up in a child process before execing.
360 if (new_style_driver && ppp_dev_fd >= 0)
374 /********************************************************************
376 * set_kdebugflag - Define the debugging level for the kernel
379 static int set_kdebugflag (int requested_level)
383 if (ioctl(ppp_dev_fd, PPPIOCSDEBUG, &requested_level) < 0) {
384 if ( ! ok_error (errno) )
385 error("ioctl(PPPIOCSDEBUG): %m (line %d)", __LINE__);
391 /********************************************************************
393 * tty_establish_ppp - Turn the serial port into a ppp interface.
396 int tty_establish_ppp (int tty_fd)
401 * Ensure that the tty device is in exclusive mode.
403 if (ioctl(tty_fd, TIOCEXCL, 0) < 0) {
404 if ( ! ok_error ( errno ))
405 warn("Couldn't make tty exclusive: %m");
408 * Demand mode - prime the old ppp device to relinquish the unit.
410 if (!new_style_driver && looped
411 && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0) {
412 error("ioctl(transfer ppp unit): %m, line %d", __LINE__);
416 * Set the current tty to the PPP discpline
420 #define N_SYNC_PPP 14
422 ppp_disc = (new_style_driver && sync_serial)? N_SYNC_PPP: N_PPP;
423 if (ioctl(tty_fd, TIOCSETD, &ppp_disc) < 0) {
424 if ( ! ok_error (errno) ) {
425 error("Couldn't set tty to PPP discipline: %m");
430 ret_fd = generic_establish_ppp(tty_fd);
432 #define SC_RCVB (SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP)
433 #define SC_LOGB (SC_DEBUG | SC_LOG_INPKT | SC_LOG_OUTPKT | SC_LOG_RAWIN \
437 modify_flags(ppp_fd, SC_RCVB | SC_LOGB,
438 (kdebugflag * SC_DEBUG) & SC_LOGB);
440 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0 && !ok_error(errno))
441 warn("Couldn't reset tty to normal line discipline: %m");
447 /********************************************************************
449 * generic_establish_ppp - Turn the fd into a ppp interface.
451 int generic_establish_ppp (int fd)
455 if (new_style_driver) {
458 /* Open an instance of /dev/ppp and connect the channel to it */
459 if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
460 error("Couldn't get channel number: %m");
463 dbglog("using channel %d", chindex);
464 fd = open("/dev/ppp", O_RDWR);
466 error("Couldn't reopen /dev/ppp: %m");
469 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
470 if (ioctl(fd, PPPIOCATTCHAN, &chindex) < 0) {
471 error("Couldn't attach to channel %d: %m", chindex);
474 flags = fcntl(fd, F_GETFL);
475 if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
476 warn("Couldn't set /dev/ppp (channel) to nonblock: %m");
481 if (!looped && !multilink) {
483 * Create a new PPP unit.
485 if (make_ppp_unit() < 0)
490 modify_flags(ppp_dev_fd, SC_LOOP_TRAFFIC, 0);
494 if (ioctl(fd, PPPIOCCONNECT, &ifunit) < 0) {
495 error("Couldn't attach to PPP unit %d: %m", ifunit);
502 * Old-style driver: find out which interface we were given.
505 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
506 if (ok_error (errno))
508 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
510 /* Check that we got the same unit again. */
511 if (looped && x != ifunit)
512 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
516 * Fetch the initial file flags and reset blocking mode on the file.
518 initfdflags = fcntl(fd, F_GETFL);
519 if (initfdflags == -1 ||
520 fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
521 if ( ! ok_error (errno))
522 warn("Couldn't set device to non-blocking mode: %m");
527 * Enable debug in the driver if requested.
530 set_kdebugflag (kdebugflag);
542 /********************************************************************
544 * tty_disestablish_ppp - Restore the serial port to normal operation.
545 * This shouldn't call die() because it's called from die().
548 void tty_disestablish_ppp(int tty_fd)
552 * Flush the tty output buffer so that the TIOCSETD doesn't hang.
554 if (tcflush(tty_fd, TCIOFLUSH) < 0)
556 warn("tcflush failed: %m");
560 * Restore the previous line discipline
562 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
563 if ( ! ok_error (errno))
564 error("ioctl(TIOCSETD, N_TTY): %m (line %d)", __LINE__);
567 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
568 if ( ! ok_error (errno))
569 warn("ioctl(TIOCNXCL): %m (line %d)", __LINE__);
572 /* Reset non-blocking mode on fd. */
573 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
574 if ( ! ok_error (errno))
575 warn("Couldn't restore device fd flags: %m");
581 generic_disestablish_ppp(tty_fd);
584 /********************************************************************
586 * generic_disestablish_ppp - Restore device components to normal
587 * operation, and reconnect the ppp unit to the loopback if in demand
588 * mode. This shouldn't call die() because it's called from die().
590 void generic_disestablish_ppp(int dev_fd)
592 if (new_style_driver) {
596 modify_flags(ppp_dev_fd, 0, SC_LOOP_TRAFFIC);
598 } else if (!doing_multilink && ppp_dev_fd >= 0) {
600 remove_fd(ppp_dev_fd);
604 /* old-style driver */
606 set_ppp_fd(slave_fd);
613 * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
614 * Assumes new_style_driver.
616 static int make_ppp_unit()
620 if (ppp_dev_fd >= 0) {
621 dbglog("in make_ppp_unit, already had /dev/ppp open?");
624 ppp_dev_fd = open("/dev/ppp", O_RDWR);
626 fatal("Couldn't open /dev/ppp: %m");
627 flags = fcntl(ppp_dev_fd, F_GETFL);
629 || fcntl(ppp_dev_fd, F_SETFL, flags | O_NONBLOCK) == -1)
630 warn("Couldn't set /dev/ppp to nonblock: %m");
633 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
634 if (x < 0 && req_unit >= 0 && errno == EEXIST) {
635 warn("Couldn't allocate PPP unit %d as it is already in use", req_unit);
637 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
640 error("Couldn't create new ppp unit: %m");
645 * cfg_bundle - configure the existing bundle.
646 * Used in demand mode.
648 void cfg_bundle(int mrru, int mtru, int rssn, int tssn)
650 if (!new_style_driver)
653 /* set the mrru, mtu and flags */
654 if (ioctl(ppp_dev_fd, PPPIOCSMRRU, &mrru) < 0)
655 error("Couldn't set MRRU: %m");
657 modify_flags(ppp_dev_fd, SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ|SC_MULTILINK,
658 ((rssn? SC_MP_SHORTSEQ: 0) | (tssn? SC_MP_XSHORTSEQ: 0)
659 | (mrru? SC_MULTILINK: 0)));
661 /* connect up the channel */
662 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0)
663 fatal("Couldn't attach to PPP unit %d: %m", ifunit);
668 * make_new_bundle - create a new PPP unit (i.e. a bundle)
669 * and connect our channel to it. This should only get called
670 * if `multilink' was set at the time establish_ppp was called.
671 * In demand mode this uses our existing bundle instead of making
674 void make_new_bundle(int mrru, int mtru, int rssn, int tssn)
676 if (!new_style_driver)
679 /* make us a ppp unit */
680 if (make_ppp_unit() < 0)
683 /* set the mrru and flags */
684 cfg_bundle(mrru, mtru, rssn, tssn);
688 * bundle_attach - attach our link to a given PPP unit.
689 * We assume the unit is controlled by another pppd.
691 int bundle_attach(int ifnum)
695 if (!new_style_driver)
698 master_fd = open("/dev/ppp", O_RDWR);
700 fatal("Couldn't open /dev/ppp: %m");
701 if (ioctl(master_fd, PPPIOCATTACH, &ifnum) < 0) {
702 if (errno == ENXIO) {
704 return 0; /* doesn't still exist */
706 fatal("Couldn't attach to interface unit %d: %m\n", ifnum);
708 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifnum) < 0)
709 fatal("Couldn't connect to interface unit %d: %m", ifnum);
710 modify_flags(master_fd, 0, SC_MULTILINK);
718 * destroy_bundle - tell the driver to destroy our bundle.
720 void destroy_bundle(void)
722 if (ppp_dev_fd >= 0) {
724 remove_fd(ppp_dev_fd);
729 /********************************************************************
731 * clean_check - Fetch the flags for the device and generate
732 * appropriate error messages.
734 void clean_check(void)
740 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
742 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
744 s = "all had bit 7 set to 1";
748 s = "all had bit 7 set to 0";
752 s = "all had odd parity";
756 s = "all had even parity";
761 warn("Receive serial link is not 8-bit clean:");
762 warn("Problem: %s", s);
770 * List of valid speeds.
774 int speed_int, speed_val;
855 { 1000000, B1000000 },
858 { 1152000, B1152000 },
861 { 1500000, B1500000 },
864 { 2000000, B2000000 },
867 { 2500000, B2500000 },
870 { 3000000, B3000000 },
873 { 3500000, B3500000 },
876 { 4000000, B4000000 },
881 /********************************************************************
883 * Translate from bits/second to a speed_t.
886 static int translate_speed (int bps)
888 struct speed *speedp;
891 for (speedp = speeds; speedp->speed_int; speedp++) {
892 if (bps == speedp->speed_int)
893 return speedp->speed_val;
895 warn("speed %d not supported", bps);
900 /********************************************************************
902 * Translate from a speed_t to bits/second.
905 static int baud_rate_of (int speed)
907 struct speed *speedp;
910 for (speedp = speeds; speedp->speed_int; speedp++) {
911 if (speed == speedp->speed_val)
912 return speedp->speed_int;
918 /********************************************************************
920 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
921 * at the requested speed, etc. If `local' is true, set CLOCAL
922 * regardless of whether the modem option was specified.
925 void set_up_tty(int tty_fd, int local)
931 if (tcgetattr(tty_fd, &tios) < 0) {
932 if (!ok_error(errno))
933 fatal("tcgetattr: %m (line %d)", __LINE__);
940 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
941 tios.c_cflag |= CS8 | CREAD | HUPCL;
943 tios.c_iflag = IGNBRK | IGNPAR;
947 tios.c_cc[VTIME] = 0;
950 tios.c_cflag ^= (CLOCAL | HUPCL);
954 tios.c_cflag |= CRTSCTS;
958 tios.c_iflag |= IXON | IXOFF;
959 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
960 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
964 tios.c_cflag &= ~CRTSCTS;
971 speed = translate_speed(inspeed);
973 cfsetospeed (&tios, speed);
974 cfsetispeed (&tios, speed);
977 * We can't proceed if the serial port speed is B0,
978 * since that implies that the serial port is disabled.
981 speed = cfgetospeed(&tios);
983 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
986 while (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0 && !ok_error(errno))
988 fatal("tcsetattr: %m (line %d)", __LINE__);
990 baud_rate = baud_rate_of(speed);
994 /********************************************************************
996 * setdtr - control the DTR line on the serial port.
997 * This is called from die(), so it shouldn't call die().
1000 void setdtr (int tty_fd, int on)
1002 int modembits = TIOCM_DTR;
1004 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
1007 /********************************************************************
1009 * restore_tty - restore the terminal to the saved settings.
1012 void restore_tty (int tty_fd)
1017 * Turn off echoing, because otherwise we can get into
1018 * a loop with the tty and the modem echoing to each other.
1019 * We presume we are the sole user of this tty device, so
1020 * when we close it, it will revert to its defaults anyway.
1022 if (!default_device)
1023 inittermios.c_lflag &= ~(ECHO | ECHONL);
1025 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
1026 if (! ok_error (errno))
1027 warn("tcsetattr: %m (line %d)", __LINE__);
1032 /********************************************************************
1034 * output - Output PPP packet.
1037 void output (int unit, unsigned char *p, int len)
1042 dump_packet("sent", p, len);
1043 if (snoop_send_hook) snoop_send_hook(p, len);
1045 if (len < PPP_HDRLEN)
1047 if (new_style_driver) {
1050 proto = (p[0] << 8) + p[1];
1051 if (ppp_dev_fd >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
1054 if (write(fd, p, len) < 0) {
1055 if (errno == EWOULDBLOCK || errno == EAGAIN || errno == ENOBUFS
1056 || errno == ENXIO || errno == EIO || errno == EINTR)
1057 warn("write: warning: %m (%d)", errno);
1059 error("write: %m (%d)", errno);
1063 /********************************************************************
1065 * wait_input - wait until there is data available,
1066 * for the length of time specified by *timo (indefinite
1070 void wait_input(struct timeval *timo)
1077 n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
1078 if (n < 0 && errno != EINTR)
1079 fatal("select: %m");
1083 * add_fd - add an fd to the set that wait_input waits for.
1087 if (fd >= FD_SETSIZE)
1088 fatal("internal error: file descriptor too large (%d)", fd);
1089 FD_SET(fd, &in_fds);
1095 * remove_fd - remove an fd from the set that wait_input waits for.
1097 void remove_fd(int fd)
1099 FD_CLR(fd, &in_fds);
1103 /********************************************************************
1105 * read_packet - get a PPP packet from the serial device.
1108 int read_packet (unsigned char *buf)
1112 len = PPP_MRU + PPP_HDRLEN;
1113 if (new_style_driver) {
1114 *buf++ = PPP_ALLSTATIONS;
1120 nr = read(ppp_fd, buf, len);
1121 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN
1122 && errno != EIO && errno != EINTR)
1124 if (nr < 0 && errno == ENXIO)
1127 if (nr < 0 && new_style_driver && ppp_dev_fd >= 0 && !bundle_eof) {
1128 /* N.B. we read ppp_fd first since LCP packets come in there. */
1129 nr = read(ppp_dev_fd, buf, len);
1130 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN
1131 && errno != EIO && errno != EINTR)
1132 error("read /dev/ppp: %m");
1133 if (nr < 0 && errno == ENXIO)
1135 if (nr == 0 && doing_multilink) {
1136 remove_fd(ppp_dev_fd);
1140 if (new_style_driver && ppp_fd < 0 && ppp_dev_fd < 0)
1142 return (new_style_driver && nr > 0)? nr+2: nr;
1145 /********************************************************************
1147 * get_loop_output - get outgoing packets from the ppp device,
1148 * and detect when we want to bring the real link up.
1149 * Return value is 1 if we need to bring up the link, 0 otherwise.
1152 get_loop_output(void)
1157 if (new_style_driver) {
1158 while ((n = read_packet(inpacket_buf)) > 0)
1159 if (loop_frame(inpacket_buf, n))
1164 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
1165 if (loop_chars(inbuf, n))
1169 fatal("eof on loopback");
1171 if (errno != EWOULDBLOCK && errno != EAGAIN)
1172 fatal("read from loopback: %m(%d)", errno);
1178 * netif_set_mtu - set the MTU on the PPP network interface.
1181 netif_set_mtu(int unit, int mtu)
1185 memset (&ifr, '\0', sizeof (ifr));
1186 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1189 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
1190 error("ioctl(SIOCSIFMTU): %m (line %d)", __LINE__);
1194 * netif_get_mtu - get the MTU on the PPP network interface.
1197 netif_get_mtu(int unit)
1201 memset (&ifr, '\0', sizeof (ifr));
1202 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1204 if (ifunit >= 0 && ioctl(sock_fd, SIOCGIFMTU, (caddr_t) &ifr) < 0) {
1205 error("ioctl(SIOCGIFMTU): %m (line %d)", __LINE__);
1211 /********************************************************************
1213 * tty_send_config - configure the transmit characteristics of
1214 * the ppp interface.
1217 void tty_send_config(int mtu, u_int32_t asyncmap, int pcomp, int accomp)
1224 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
1225 if (errno != EIO && errno != ENOTTY)
1226 error("Couldn't set transmit async character map: %m");
1231 x = (pcomp? SC_COMP_PROT: 0) | (accomp? SC_COMP_AC: 0)
1232 | (sync_serial? SC_SYNC: 0);
1233 modify_flags(ppp_fd, SC_COMP_PROT|SC_COMP_AC|SC_SYNC, x);
1236 /********************************************************************
1238 * tty_set_xaccm - set the extended transmit ACCM for the interface.
1241 void tty_set_xaccm (ext_accm accm)
1245 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
1246 if ( ! ok_error (errno))
1247 warn("ioctl(set extended ACCM): %m (line %d)", __LINE__);
1251 /********************************************************************
1253 * tty_recv_config - configure the receive-side characteristics of
1254 * the ppp interface.
1257 void tty_recv_config(int mru, u_int32_t asyncmap, int pcomp, int accomp)
1260 * If we were called because the link has gone down then there is nothing
1261 * which may be done. Just return without incident.
1266 * Set the receiver parameters
1268 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
1269 if (errno != EIO && errno != ENOTTY)
1270 error("Couldn't set channel receive MRU: %m");
1272 if (new_style_driver && ppp_dev_fd >= 0
1273 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1274 error("Couldn't set MRU in generic PPP layer: %m");
1276 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
1277 if (errno != EIO && errno != ENOTTY)
1278 error("Couldn't set channel receive asyncmap: %m");
1282 /********************************************************************
1284 * ccp_test - ask kernel whether a given compression method
1285 * is acceptable for use.
1289 ccp_test(int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1291 struct ppp_option_data data;
1293 memset (&data, '\0', sizeof (data));
1295 data.length = opt_len;
1296 data.transmit = for_transmit;
1298 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1301 return (errno == ENOBUFS)? 0: -1;
1304 /********************************************************************
1306 * ccp_flags_set - inform kernel about the current state of CCP.
1309 void ccp_flags_set (int unit, int isopen, int isup)
1313 x = (isopen? SC_CCP_OPEN: 0) | (isup? SC_CCP_UP: 0);
1314 if (still_ppp() && ppp_dev_fd >= 0)
1315 modify_flags(ppp_dev_fd, SC_CCP_OPEN|SC_CCP_UP, x);
1320 * set_filters - set the active and pass filters in the kernel driver.
1322 int set_filters(struct bpf_program *pass, struct bpf_program *active)
1324 struct sock_fprog fp;
1326 fp.len = pass->bf_len;
1327 fp.filter = (struct sock_filter *) pass->bf_insns;
1328 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) {
1329 if (errno == ENOTTY)
1330 warn("kernel does not support PPP filtering");
1332 error("Couldn't set pass-filter in kernel: %m");
1335 fp.len = active->bf_len;
1336 fp.filter = (struct sock_filter *) active->bf_insns;
1337 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) {
1338 error("Couldn't set active-filter in kernel: %m");
1343 #endif /* PPP_FILTER */
1345 /********************************************************************
1347 * get_idle_time - return how long the link has been idle.
1350 get_idle_time(u, ip)
1352 struct ppp_idle *ip;
1354 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
1357 /********************************************************************
1359 * get_ppp_stats - return statistics for the link.
1362 get_ppp_stats(u, stats)
1364 struct pppd_stats *stats;
1366 struct ifpppstatsreq req;
1368 memset (&req, 0, sizeof (req));
1370 req.stats_ptr = (caddr_t) &req.stats;
1371 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
1372 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
1373 error("Couldn't get PPP statistics: %m");
1376 stats->bytes_in = req.stats.p.ppp_ibytes;
1377 stats->bytes_out = req.stats.p.ppp_obytes;
1378 stats->pkts_in = req.stats.p.ppp_ipackets;
1379 stats->pkts_out = req.stats.p.ppp_opackets;
1383 /********************************************************************
1385 * ccp_fatal_error - returns 1 if decompression was disabled as a
1386 * result of an error detected after decompression of a packet,
1387 * 0 otherwise. This is necessary because of patent nonsense.
1390 int ccp_fatal_error (int unit)
1394 if (ioctl(ppp_dev_fd, PPPIOCGFLAGS, &flags) < 0) {
1395 error("Couldn't read compression error flags: %m");
1398 return flags & SC_DC_FERROR;
1401 /********************************************************************
1403 * path_to_procfs - find the path to the proc file system mount point
1405 static char proc_path[MAXPATHLEN];
1406 static int proc_path_len;
1408 static char *path_to_procfs(const char *tail)
1410 struct mntent *mntent;
1413 if (proc_path_len == 0) {
1414 /* Default the mount location of /proc */
1415 strlcpy (proc_path, "/proc", sizeof(proc_path));
1417 fp = fopen(MOUNTED, "r");
1419 while ((mntent = getmntent(fp)) != NULL) {
1420 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1422 if (strcmp(mntent->mnt_type, "proc") == 0) {
1423 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path));
1424 proc_path_len = strlen(proc_path);
1432 strlcpy(proc_path + proc_path_len, tail,
1433 sizeof(proc_path) - proc_path_len);
1438 * /proc/net/route parsing stuff.
1440 #define ROUTE_MAX_COLS 12
1441 FILE *route_fd = (FILE *) 0;
1442 static char route_buffer[512];
1443 static int route_dev_col, route_dest_col, route_gw_col;
1444 static int route_flags_col, route_metric_col, route_mask_col;
1445 static int route_num_cols;
1447 static int open_route_table (void);
1448 static void close_route_table (void);
1449 static int read_route_table (struct rtentry *rt);
1451 /********************************************************************
1453 * close_route_table - close the interface to the route table
1456 static void close_route_table (void)
1458 if (route_fd != (FILE *) 0) {
1460 route_fd = (FILE *) 0;
1464 /********************************************************************
1466 * open_route_table - open the interface to the route table
1468 static char route_delims[] = " \t\n";
1470 static int open_route_table (void)
1474 close_route_table();
1476 path = path_to_procfs("/net/route");
1477 route_fd = fopen (path, "r");
1478 if (route_fd == NULL) {
1479 error("can't open routing table %s: %m", path);
1483 route_dev_col = 0; /* default to usual columns */
1486 route_flags_col = 3;
1487 route_metric_col = 6;
1491 /* parse header line */
1492 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1493 char *p = route_buffer, *q;
1495 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1497 if ((q = strtok(p, route_delims)) == 0)
1499 if (strcasecmp(q, "iface") == 0)
1500 route_dev_col = col;
1501 else if (strcasecmp(q, "destination") == 0)
1502 route_dest_col = col;
1503 else if (strcasecmp(q, "gateway") == 0)
1505 else if (strcasecmp(q, "flags") == 0)
1506 route_flags_col = col;
1507 else if (strcasecmp(q, "mask") == 0)
1508 route_mask_col = col;
1511 if (used && col >= route_num_cols)
1512 route_num_cols = col + 1;
1520 /********************************************************************
1522 * read_route_table - read the next entry from the route table
1525 static int read_route_table(struct rtentry *rt)
1527 char *cols[ROUTE_MAX_COLS], *p;
1530 memset (rt, '\0', sizeof (struct rtentry));
1532 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1536 for (col = 0; col < route_num_cols; ++col) {
1537 cols[col] = strtok(p, route_delims);
1538 if (cols[col] == NULL)
1539 return 0; /* didn't get enough columns */
1543 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
1544 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
1545 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
1547 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1548 rt->rt_metric = (short) strtoul(cols[route_metric_col], NULL, 10);
1549 rt->rt_dev = cols[route_dev_col];
1554 /********************************************************************
1556 * defaultroute_exists - determine if there is a default route
1557 * with the given metric (or negative for any)
1560 static int defaultroute_exists (struct rtentry *rt, int metric)
1564 if (!open_route_table())
1567 while (read_route_table(rt) != 0) {
1568 if ((rt->rt_flags & RTF_UP) == 0)
1571 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
1573 if (SIN_ADDR(rt->rt_dst) == 0L && (metric < 0
1574 || rt->rt_metric == metric)) {
1580 close_route_table();
1585 * have_route_to - determine if the system has any route to
1586 * a given IP address. `addr' is in network byte order.
1587 * Return value is 1 if yes, 0 if no, -1 if don't know.
1588 * For demand mode to work properly, we have to ignore routes
1589 * through our own interface.
1591 int have_route_to(u_int32_t addr)
1596 if (!open_route_table())
1597 return -1; /* don't know */
1599 while (read_route_table(&rt)) {
1600 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1602 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) {
1608 close_route_table();
1612 /********************************************************************
1614 * sifdefaultroute - assign a default route through the address given.
1617 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1621 if (defaultroute_exists(&rt, dfl_route_metric) && strcmp(rt.rt_dev, ifname) != 0) {
1622 if (rt.rt_flags & RTF_GATEWAY)
1623 error("not replacing existing default route via %I with metric %d",
1624 SIN_ADDR(rt.rt_gateway), dfl_route_metric);
1626 error("not replacing existing default route through %s with metric %d",
1627 rt.rt_dev, dfl_route_metric);
1631 memset (&rt, 0, sizeof (rt));
1632 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1635 rt.rt_metric = dfl_route_metric + 1; /* +1 for binary compatibility */
1637 if (kernel_version > KVERSION(2,1,0)) {
1638 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1639 SIN_ADDR(rt.rt_genmask) = 0L;
1642 rt.rt_flags = RTF_UP;
1643 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1644 if ( ! ok_error ( errno ))
1645 error("default route ioctl(SIOCADDRT): %m");
1649 have_default_route = 1;
1653 /********************************************************************
1655 * cifdefaultroute - delete a default route through the address given.
1658 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1662 have_default_route = 0;
1664 memset (&rt, '\0', sizeof (rt));
1665 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1666 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1671 rt.rt_metric = dfl_route_metric + 1; /* +1 for binary compatibility */
1673 if (kernel_version > KVERSION(2,1,0)) {
1674 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1675 SIN_ADDR(rt.rt_genmask) = 0L;
1678 rt.rt_flags = RTF_UP;
1679 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1681 if ( ! ok_error ( errno ))
1682 error("default route ioctl(SIOCDELRT): %m");
1690 /********************************************************************
1692 * sifproxyarp - Make a proxy ARP entry for the peer.
1695 int sifproxyarp (int unit, u_int32_t his_adr)
1697 struct arpreq arpreq;
1700 if (has_proxy_arp == 0) {
1701 memset (&arpreq, '\0', sizeof(arpreq));
1703 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1704 SIN_ADDR(arpreq.arp_pa) = his_adr;
1705 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1707 * Get the hardware address of an interface on the same subnet
1708 * as our local address.
1710 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1711 sizeof(proxy_arp_dev))) {
1712 error("Cannot determine ethernet address for proxy ARP");
1715 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1717 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1718 if ( ! ok_error ( errno ))
1719 error("ioctl(SIOCSARP): %m");
1722 proxy_arp_addr = his_adr;
1726 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward");
1727 if (forw_path != 0) {
1728 int fd = open(forw_path, O_WRONLY);
1730 if (write(fd, "1", 1) != 1)
1731 error("Couldn't enable IP forwarding: %m");
1741 /********************************************************************
1743 * cifproxyarp - Delete the proxy ARP entry for the peer.
1746 int cifproxyarp (int unit, u_int32_t his_adr)
1748 struct arpreq arpreq;
1750 if (has_proxy_arp) {
1752 memset (&arpreq, '\0', sizeof(arpreq));
1753 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1754 SIN_ADDR(arpreq.arp_pa) = his_adr;
1755 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1756 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1758 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1759 if ( ! ok_error ( errno ))
1760 warn("ioctl(SIOCDARP): %m");
1767 /********************************************************************
1769 * get_ether_addr - get the hardware address of an interface on the
1770 * the same subnet as ipaddr.
1773 static int get_ether_addr (u_int32_t ipaddr,
1774 struct sockaddr *hwaddr,
1775 char *name, int namelen)
1777 struct ifreq *ifr, *ifend;
1778 u_int32_t ina, mask;
1780 struct ifreq ifreq, bestifreq;
1782 struct ifreq ifs[MAX_IFS];
1784 u_int32_t bestmask=0;
1785 int found_interface = 0;
1787 ifc.ifc_len = sizeof(ifs);
1789 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1790 if ( ! ok_error ( errno ))
1791 error("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1796 * Scan through looking for an interface with an Internet
1797 * address on the same subnet as `ipaddr'.
1799 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1800 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1801 if (ifr->ifr_addr.sa_family == AF_INET) {
1802 ina = SIN_ADDR(ifr->ifr_addr);
1803 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1805 * Check that the interface is up, and not point-to-point
1808 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1811 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1814 * Get its netmask and check that it's on the right subnet.
1816 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1819 mask = SIN_ADDR(ifreq.ifr_addr);
1821 if (((ipaddr ^ ina) & mask) != 0)
1822 continue; /* no match */
1824 if (mask >= bestmask) {
1825 /* Compare using >= instead of > -- it is possible for
1826 an interface to have a netmask of 0.0.0.0 */
1827 found_interface = 1;
1834 if (!found_interface) return 0;
1836 strlcpy(name, bestifreq.ifr_name, namelen);
1838 /* trim off the :1 in eth0:1 */
1839 aliasp = strchr(name, ':');
1843 info("found interface %s for proxy arp", name);
1845 * Now get the hardware address.
1847 memset (&bestifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1848 if (ioctl (sock_fd, SIOCGIFHWADDR, &bestifreq) < 0) {
1849 error("SIOCGIFHWADDR(%s): %m", bestifreq.ifr_name);
1854 &bestifreq.ifr_hwaddr,
1855 sizeof (struct sockaddr));
1861 * get_if_hwaddr - get the hardware address for the specified
1862 * network interface device.
1865 get_if_hwaddr(u_char *addr, char *name)
1870 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
1873 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
1874 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
1875 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
1878 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
1883 * get_first_ethernet - return the name of the first ethernet-style
1884 * interface on this system.
1887 get_first_ethernet()
1892 /********************************************************************
1894 * Return user specified netmask, modified by any mask we might determine
1895 * for address `addr' (in network byte order).
1896 * Here we scan through the system's list of interfaces, looking for
1897 * any non-point-to-point interfaces which might appear to be on the same
1898 * network as `addr'. If we find any, we OR in their netmask to the
1899 * user-specified netmask.
1902 u_int32_t GetMask (u_int32_t addr)
1904 u_int32_t mask, nmask, ina;
1905 struct ifreq *ifr, *ifend, ifreq;
1907 struct ifreq ifs[MAX_IFS];
1911 if (IN_CLASSA(addr)) /* determine network mask for address class */
1912 nmask = IN_CLASSA_NET;
1913 else if (IN_CLASSB(addr))
1914 nmask = IN_CLASSB_NET;
1916 nmask = IN_CLASSC_NET;
1918 /* class D nets are disallowed by bad_ip_adrs */
1919 mask = netmask | htonl(nmask);
1921 * Scan through the system's network interfaces.
1923 ifc.ifc_len = sizeof(ifs);
1925 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1926 if ( ! ok_error ( errno ))
1927 warn("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1931 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1932 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1934 * Check the interface's internet address.
1936 if (ifr->ifr_addr.sa_family != AF_INET)
1938 ina = SIN_ADDR(ifr->ifr_addr);
1939 if (((ntohl(ina) ^ addr) & nmask) != 0)
1942 * Check that the interface is up, and not point-to-point nor loopback.
1944 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1945 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1948 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1951 * Get its netmask and OR it into our mask.
1953 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1955 mask |= SIN_ADDR(ifreq.ifr_addr);
1961 /********************************************************************
1963 * Internal routine to decode the version.modification.patch level
1966 static void decode_version (char *buf, int *version,
1967 int *modification, int *patch)
1971 *version = (int) strtoul (buf, &endp, 10);
1975 if (endp != buf && *endp == '.') {
1977 *modification = (int) strtoul (buf, &endp, 10);
1978 if (endp != buf && *endp == '.') {
1980 *patch = (int) strtoul (buf, &buf, 10);
1985 /********************************************************************
1987 * Procedure to determine if the PPP line discipline is registered.
1991 ppp_registered(void)
1999 * We used to open the serial device and set it to the ppp line
2000 * discipline here, in order to create a ppp unit. But that is
2001 * not a good idea - the user might have specified a device that
2002 * they can't open (permission, or maybe it doesn't really exist).
2003 * So we grab a pty master/slave pair and use that.
2005 if (!get_pty(&mfd, &local_fd, slave, 0)) {
2006 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
2011 * Try to put the device into the PPP discipline.
2013 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
2014 error("ioctl(TIOCSETD(PPP)): %m (line %d)", __LINE__);
2023 /********************************************************************
2025 * ppp_available - check whether the system has any ppp interfaces
2026 * (in fact we check whether we can do an ioctl on ppp0).
2029 int ppp_available(void)
2034 int my_version, my_modification, my_patch;
2035 int osmaj, osmin, ospatch;
2037 /* get the kernel version now, since we are called before sys_init */
2039 osmaj = osmin = ospatch = 0;
2040 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
2041 kernel_version = KVERSION(osmaj, osmin, ospatch);
2043 fd = open("/dev/ppp", O_RDWR);
2045 new_style_driver = 1;
2047 /* XXX should get from driver */
2049 driver_modification = 4;
2055 if (kernel_version >= KVERSION(2,3,13)) {
2056 error("Couldn't open the /dev/ppp device: %m");
2057 if (errno == ENOENT)
2059 "You need to create the /dev/ppp device node by\n"
2060 "executing the following command as root:\n"
2061 " mknod /dev/ppp c 108 0\n";
2062 else if (errno == ENODEV || errno == ENXIO)
2064 "Please load the ppp_generic kernel module.\n";
2068 /* we are running on a really really old kernel */
2070 "This system lacks kernel support for PPP. This could be because\n"
2071 "the PPP kernel module could not be loaded, or because PPP was not\n"
2072 "included in the kernel configuration. If PPP was included as a\n"
2073 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
2074 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
2075 "See README.linux file in the ppp distribution for more details.\n";
2078 * Open a socket for doing the ioctl operations.
2080 s = socket(AF_INET, SOCK_DGRAM, 0);
2084 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2085 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2087 * If the device did not exist then attempt to create one by putting the
2088 * current tty into the PPP discipline. If this works then obtain the
2089 * flags for the device again.
2092 if (ppp_registered()) {
2093 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2094 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2098 * Ensure that the hardware address is for PPP and not something else
2101 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
2103 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
2107 * This is the PPP device. Validate the version of the driver at this
2108 * point to ensure that this program will work with the driver.
2111 char abBuffer [1024];
2113 ifr.ifr_data = abBuffer;
2114 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
2116 error("Couldn't read driver version: %m");
2118 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
2121 decode_version(abBuffer,
2123 &driver_modification,
2126 * Validate the version of the driver against the version that we used.
2128 decode_version(VERSION,
2133 /* The version numbers must match */
2134 if (driver_version != my_version)
2137 /* The modification levels must be legal */
2138 if (driver_modification < 3) {
2139 if (driver_modification >= 2) {
2140 /* we can cope with 2.2.0 and above */
2149 slprintf(route_buffer, sizeof(route_buffer),
2150 "Sorry - PPP driver version %d.%d.%d is out of date\n",
2151 driver_version, driver_modification, driver_patch);
2153 no_ppp_msg = route_buffer;
2160 #ifndef HAVE_LOGWTMP
2161 /********************************************************************
2163 * Update the wtmp file with the appropriate user name and tty device.
2166 void logwtmp (const char *line, const char *name, const char *host)
2168 struct utmp ut, *utp;
2169 pid_t mypid = getpid();
2175 * Update the signon database for users.
2176 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
2178 utmpname(_PATH_UTMP);
2180 while ((utp = getutent()) && (utp->ut_pid != mypid))
2184 memcpy(&ut, utp, sizeof(ut));
2186 /* some gettys/telnetds don't initialize utmp... */
2187 memset(&ut, 0, sizeof(ut));
2189 if (ut.ut_id[0] == 0)
2190 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
2192 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
2193 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
2197 ut.ut_type = USER_PROCESS;
2200 /* Insert the host name if one is supplied */
2202 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
2204 /* Insert the IP address of the remote system if IP is enabled */
2205 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
2206 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
2207 sizeof(ut.ut_addr));
2209 /* CL: Makes sure that the logout works */
2210 if (*host == 0 && *name==0)
2216 * Update the wtmp file.
2219 updwtmp(_PATH_WTMP, &ut);
2221 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
2223 flock(wtmp, LOCK_EX);
2225 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut))
2226 warn("error writing %s: %m", _PATH_WTMP);
2228 flock(wtmp, LOCK_UN);
2234 #endif /* HAVE_LOGWTMP */
2236 /********************************************************************
2238 * sifvjcomp - config tcp header compression
2241 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2246 if (ioctl(ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
2247 error("Couldn't set up TCP header compression: %m");
2252 x = (vjcomp? SC_COMP_TCP: 0) | (cidcomp? 0: SC_NO_TCP_CCID);
2253 modify_flags(ppp_dev_fd, SC_COMP_TCP|SC_NO_TCP_CCID, x);
2258 /********************************************************************
2260 * sifup - Config the interface up and enable IP packets to pass.
2267 memset (&ifr, '\0', sizeof (ifr));
2268 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2269 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2270 if (! ok_error (errno))
2271 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2275 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2276 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2277 if (! ok_error (errno))
2278 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2286 /********************************************************************
2288 * sifdown - Disable the indicated protocol and config the interface
2289 * down if there are no remaining protocols.
2296 if (if_is_up && --if_is_up > 0)
2299 memset (&ifr, '\0', sizeof (ifr));
2300 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2301 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2302 if (! ok_error (errno))
2303 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2307 ifr.ifr_flags &= ~IFF_UP;
2308 ifr.ifr_flags |= IFF_POINTOPOINT;
2309 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2310 if (! ok_error (errno))
2311 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2317 /********************************************************************
2319 * sifaddr - Config the interface IP addresses and netmask.
2322 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2328 memset (&ifr, '\0', sizeof (ifr));
2329 memset (&rt, '\0', sizeof (rt));
2331 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2332 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2333 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2335 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2337 * Set our IP address
2339 SIN_ADDR(ifr.ifr_addr) = our_adr;
2340 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2341 if (errno != EEXIST) {
2342 if (! ok_error (errno))
2343 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2346 warn("ioctl(SIOCSIFADDR): Address already exists");
2351 * Set the gateway address
2354 SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
2355 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2356 if (! ok_error (errno))
2357 error("ioctl(SIOCSIFDSTADDR): %m (line %d)", __LINE__);
2363 * For recent kernels, force the netmask to 255.255.255.255.
2365 if (kernel_version >= KVERSION(2,1,16))
2367 if (net_mask != 0) {
2368 SIN_ADDR(ifr.ifr_netmask) = net_mask;
2369 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2370 if (! ok_error (errno))
2371 error("ioctl(SIOCSIFNETMASK): %m (line %d)", __LINE__);
2376 * Add the device route
2378 if (kernel_version < KVERSION(2,1,16)) {
2379 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2380 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2383 SIN_ADDR(rt.rt_gateway) = 0L;
2384 SIN_ADDR(rt.rt_dst) = his_adr;
2385 rt.rt_flags = RTF_UP | RTF_HOST;
2387 if (kernel_version > KVERSION(2,1,0)) {
2388 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2389 SIN_ADDR(rt.rt_genmask) = -1L;
2392 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2393 if (! ok_error (errno))
2394 error("ioctl(SIOCADDRT) device route: %m (line %d)", __LINE__);
2399 /* set ip_dynaddr in demand mode if address changes */
2400 if (demand && tune_kernel && !dynaddr_set
2401 && our_old_addr && our_old_addr != our_adr) {
2402 /* set ip_dynaddr if possible */
2406 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
2407 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
2408 if (write(fd, "1", 1) != 1)
2409 error("Couldn't enable dynamic IP addressing: %m");
2412 dynaddr_set = 1; /* only 1 attempt */
2419 /********************************************************************
2421 * cifaddr - Clear the interface IP addresses, and delete routes
2422 * through the interface if possible.
2425 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2429 if (kernel_version < KVERSION(2,1,16)) {
2431 * Delete the route through the device
2434 memset (&rt, '\0', sizeof (rt));
2436 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2437 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2440 SIN_ADDR(rt.rt_gateway) = 0;
2441 SIN_ADDR(rt.rt_dst) = his_adr;
2442 rt.rt_flags = RTF_UP | RTF_HOST;
2444 if (kernel_version > KVERSION(2,1,0)) {
2445 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2446 SIN_ADDR(rt.rt_genmask) = -1L;
2449 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2450 if (still_ppp() && ! ok_error (errno))
2451 error("ioctl(SIOCDELRT) device route: %m (line %d)", __LINE__);
2456 /* This way it is possible to have an IPX-only or IPv6-only interface */
2457 memset(&ifr, 0, sizeof(ifr));
2458 SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
2459 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2461 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2462 if (! ok_error (errno)) {
2463 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2468 our_old_addr = our_adr;
2474 /********************************************************************
2476 * sif6addr - Config the interface with an IPv6 link-local address
2478 int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2480 struct in6_ifreq ifr6;
2482 struct in6_rtmsg rt6;
2486 error("IPv6 socket creation failed: %m");
2489 memset(&ifr, 0, sizeof (ifr));
2490 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2491 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2492 error("sif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2496 /* Local interface */
2497 memset(&ifr6, 0, sizeof(ifr6));
2498 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2499 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2500 ifr6.ifr6_prefixlen = 10;
2502 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
2503 error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2507 /* Route to remote host */
2508 memset(&rt6, 0, sizeof(rt6));
2509 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
2510 rt6.rtmsg_flags = RTF_UP;
2511 rt6.rtmsg_dst_len = 10;
2512 rt6.rtmsg_ifindex = ifr.ifr_ifindex;
2513 rt6.rtmsg_metric = 1;
2515 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
2516 error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
2524 /********************************************************************
2526 * cif6addr - Remove IPv6 address from interface
2528 int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2531 struct in6_ifreq ifr6;
2535 error("IPv6 socket creation failed: %m");
2538 memset(&ifr, 0, sizeof(ifr));
2539 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2540 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2541 error("cif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2545 memset(&ifr6, 0, sizeof(ifr6));
2546 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2547 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2548 ifr6.ifr6_prefixlen = 10;
2550 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
2551 if (errno != EADDRNOTAVAIL) {
2552 if (! ok_error (errno))
2553 error("cif6addr: ioctl(SIOCDIFADDR): %m (line %d)", __LINE__);
2556 warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
2565 * get_pty - get a pty master/slave pair and chown the slave side
2566 * to the uid given. Assumes slave_name points to >= 16 bytes of space.
2569 get_pty(master_fdp, slave_fdp, slave_name, uid)
2575 int i, mfd, sfd = -1;
2577 struct termios tios;
2581 * Try the unix98 way first.
2583 mfd = open("/dev/ptmx", O_RDWR);
2586 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
2587 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
2588 chmod(pty_name, S_IRUSR | S_IWUSR);
2591 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
2592 warn("Couldn't unlock pty slave %s: %m", pty_name);
2594 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0)
2595 warn("Couldn't open pty slave %s: %m", pty_name);
2598 #endif /* TIOCGPTN */
2601 /* the old way - scan through the pty name space */
2602 for (i = 0; i < 64; ++i) {
2603 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2604 'p' + i / 16, i % 16);
2605 mfd = open(pty_name, O_RDWR, 0);
2608 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2610 fchown(sfd, uid, -1);
2611 fchmod(sfd, S_IRUSR | S_IWUSR);
2622 strlcpy(slave_name, pty_name, 16);
2625 if (tcgetattr(sfd, &tios) == 0) {
2626 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2627 tios.c_cflag |= CS8 | CREAD | CLOCAL;
2628 tios.c_iflag = IGNPAR;
2631 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2632 warn("couldn't set attributes on pty: %m");
2634 warn("couldn't get attributes on pty: %m");
2639 /********************************************************************
2641 * open_loopback - open the device we use for getting packets
2642 * in demand mode. Under Linux, we use a pty master/slave pair.
2645 open_ppp_loopback(void)
2650 if (new_style_driver) {
2651 /* allocate ourselves a ppp unit */
2652 if (make_ppp_unit() < 0)
2654 modify_flags(ppp_dev_fd, 0, SC_LOOP_TRAFFIC);
2655 set_kdebugflag(kdebugflag);
2660 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2661 fatal("No free pty for loopback");
2663 set_ppp_fd(slave_fd);
2665 flags = fcntl(master_fd, F_GETFL);
2667 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2668 warn("couldn't set master loopback to nonblock: %m");
2670 flags = fcntl(ppp_fd, F_GETFL);
2672 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2673 warn("couldn't set slave loopback to nonblock: %m");
2675 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2676 fatal("ioctl(TIOCSETD): %m (line %d)", __LINE__);
2678 * Find out which interface we were given.
2680 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2681 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
2683 * Enable debug in the driver if requested.
2685 set_kdebugflag (kdebugflag);
2690 /********************************************************************
2692 * sifnpmode - Set the mode for handling packets for a given NP.
2696 sifnpmode(u, proto, mode)
2703 npi.protocol = proto;
2705 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2706 if (! ok_error (errno))
2707 error("ioctl(PPPIOCSNPMODE, %d, %d): %m", proto, mode);
2714 /********************************************************************
2716 * sipxfaddr - Config the interface IPX networknumber
2719 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2726 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2728 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2730 if (! ok_error (errno))
2731 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2735 memset (&ifr, '\0', sizeof (ifr));
2736 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2738 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2739 sipx->sipx_family = AF_IPX;
2740 sipx->sipx_port = 0;
2741 sipx->sipx_network = htonl (network);
2742 sipx->sipx_type = IPX_FRAME_ETHERII;
2743 sipx->sipx_action = IPX_CRTITF;
2745 * Set the IPX device
2747 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2749 if (errno != EEXIST) {
2750 if (! ok_error (errno))
2751 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (line %d)", __LINE__);
2754 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2763 /********************************************************************
2765 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2766 * are removed and the device is no longer able to pass IPX
2770 int cipxfaddr (int unit)
2777 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2779 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2781 if (! ok_error (errno))
2782 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2786 memset (&ifr, '\0', sizeof (ifr));
2787 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2789 sipx->sipx_type = IPX_FRAME_ETHERII;
2790 sipx->sipx_action = IPX_DLTITF;
2791 sipx->sipx_family = AF_IPX;
2793 * Set the IPX device
2795 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2796 if (! ok_error (errno))
2797 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (line %d)", __LINE__);
2807 * Use the hostname as part of the random number seed.
2816 for (p = hostname; *p != 0; ++p)
2821 /********************************************************************
2823 * sys_check_options - check the options that the user specified
2827 sys_check_options(void)
2831 * Disable the IPX protocol if the support is not present in the kernel.
2835 if (ipxcp_protent.enabled_flag) {
2836 struct stat stat_buf;
2837 if ( ((path = path_to_procfs("/net/ipx/interface")) == NULL
2838 && (path = path_to_procfs("/net/ipx_interface")) == NULL)
2839 || lstat(path, &stat_buf) < 0) {
2840 error("IPX support is not present in the kernel\n");
2841 ipxcp_protent.enabled_flag = 0;
2845 if (demand && driver_is_old) {
2846 option_error("demand dialling is not supported by kernel driver "
2847 "version %d.%d.%d", driver_version, driver_modification,
2851 if (multilink && !new_style_driver) {
2852 warn("Warning: multilink is not supported by the kernel driver");
2860 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
2862 * convert the 48-bit MAC address of eth0 into EUI 64. caller also assumes
2863 * that the system has a properly configured Ethernet interface for this
2864 * function to return non-zero.
2867 ether_to_eui64(eui64_t *p_eui64)
2871 const unsigned char *ptr;
2873 skfd = socket(PF_INET6, SOCK_DGRAM, 0);
2876 warn("could not open IPv6 socket");
2880 strcpy(ifr.ifr_name, "eth0");
2881 if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
2884 warn("could not obtain hardware address for eth0");
2890 * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
2892 ptr = (unsigned char *) ifr.ifr_hwaddr.sa_data;
2893 p_eui64->e8[0] = ptr[0] | 0x02;
2894 p_eui64->e8[1] = ptr[1];
2895 p_eui64->e8[2] = ptr[2];
2896 p_eui64->e8[3] = 0xFF;
2897 p_eui64->e8[4] = 0xFE;
2898 p_eui64->e8[5] = ptr[3];
2899 p_eui64->e8[6] = ptr[4];
2900 p_eui64->e8[7] = ptr[5];