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>
97 /* This is in netdevice.h. However, this compile will fail miserably if
98 you attempt to include netdevice.h because it has so many references
99 to __memcpy functions which it should not attempt to do. So, since I
100 really don't use it, but it must be defined, define it now. */
103 #define xxMAX_ADDR_LEN 7
107 #include <asm/types.h> /* glibc 2 conflicts with linux/types.h */
109 #include <net/if_arp.h>
110 #include <net/route.h>
111 #include <netinet/if_ether.h>
113 #include <linux/types.h>
114 #include <linux/if.h>
115 #include <linux/if_arp.h>
116 #include <linux/route.h>
117 #include <linux/if_ether.h>
119 #include <linux/sockios.h>
120 #include <netinet/in.h>
121 #include <arpa/inet.h>
123 #include <linux/ppp_defs.h>
124 #include <linux/if_ppp.h>
132 #if __GLIBC__ >= 2 && \
133 !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
134 #include <netipx/ipx.h>
136 #include <linux/ipx.h>
138 #endif /* IPX_CHANGE */
141 #include <pcap-bpf.h>
142 #include <linux/filter.h>
143 #endif /* PPP_FILTER */
146 #include <sys/locks.h>
152 * This is in linux/include/net/ipv6.h.
156 struct in6_addr ifr6_addr;
157 __u32 ifr6_prefixlen;
158 unsigned int ifr6_ifindex;
162 #define IN6_LLADDR_FROM_EUI64(sin6, eui64) do { \
163 memset(&sin6.s6_addr, 0, sizeof(struct in6_addr)); \
164 sin6.s6_addr16[0] = htons(0xfe80); \
165 eui64_copy(eui64, sin6.s6_addr32[2]); \
170 /* We can get an EIO error on an ioctl if the modem has hung up */
171 #define ok_error(num) ((num)==EIO)
173 static int tty_disc = N_TTY; /* The TTY discipline */
174 static int ppp_disc = N_PPP; /* The PPP discpline */
175 static int initfdflags = -1; /* Initial file descriptor flags for fd */
176 static int ppp_fd = -1; /* fd which is set to PPP discipline */
177 static int sock_fd = -1; /* socket for doing interface ioctls */
178 static int slave_fd = -1; /* pty for old-style demand mode, slave */
179 static int master_fd = -1; /* pty for old-style demand mode, master */
181 static int sock6_fd = -1;
185 * For the old-style kernel driver, this is the same as ppp_fd.
186 * For the new-style driver, it is the fd of an instance of /dev/ppp
187 * which is attached to the ppp unit and is used for controlling it.
189 int ppp_dev_fd = -1; /* fd for /dev/ppp (new style driver) */
191 static int chindex; /* channel index (new style driver) */
193 static fd_set in_fds; /* set of fds that wait_input waits for */
194 static int max_in_fd; /* highest fd set in in_fds */
196 static int has_proxy_arp = 0;
197 static int driver_version = 0;
198 static int driver_modification = 0;
199 static int driver_patch = 0;
200 static int driver_is_old = 0;
201 static int restore_term = 0; /* 1 => we've munged the terminal */
202 static struct termios inittermios; /* Initial TTY termios */
204 int new_style_driver = 0;
206 static char loop_name[20];
207 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
209 static int if_is_up; /* Interface has been marked up */
210 static u_int32_t default_route_gateway; /* Gateway for default route added */
211 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
212 static char proxy_arp_dev[16]; /* Device for proxy arp entry */
213 static u_int32_t our_old_addr; /* for detecting address changes */
214 static int dynaddr_set; /* 1 if ip_dynaddr set */
215 static int looped; /* 1 if using loop */
216 static int link_mtu; /* mtu for the link (not bundle) */
218 static struct utsname utsname; /* for the kernel version */
219 static int kernel_version;
220 #define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
224 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
225 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
226 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
228 #define SIN_ADDR(x) (((struct sockaddr_in *) (&(x)))->sin_addr.s_addr)
230 /* Prototypes for procedures local to this file. */
231 static int modify_flags(int fd, int clear_bits, int set_bits);
232 static int translate_speed (int bps);
233 static int baud_rate_of (int speed);
234 static void close_route_table (void);
235 static int open_route_table (void);
236 static int read_route_table (struct rtentry *rt);
237 static int defaultroute_exists (struct rtentry *rt);
238 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
239 char *name, int namelen);
240 static void decode_version (char *buf, int *version, int *mod, int *patch);
241 static int set_kdebugflag(int level);
242 static int ppp_registered(void);
243 static int make_ppp_unit(void);
245 extern u_char inpacket_buf[]; /* borrowed from main.c */
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 (default_route_gateway != 0)
347 cifdefaultroute(0, 0, default_route_gateway);
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;
857 /********************************************************************
859 * Translate from bits/second to a speed_t.
862 static int translate_speed (int bps)
864 struct speed *speedp;
867 for (speedp = speeds; speedp->speed_int; speedp++) {
868 if (bps == speedp->speed_int)
869 return speedp->speed_val;
871 warn("speed %d not supported", bps);
876 /********************************************************************
878 * Translate from a speed_t to bits/second.
881 static int baud_rate_of (int speed)
883 struct speed *speedp;
886 for (speedp = speeds; speedp->speed_int; speedp++) {
887 if (speed == speedp->speed_val)
888 return speedp->speed_int;
894 /********************************************************************
896 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
897 * at the requested speed, etc. If `local' is true, set CLOCAL
898 * regardless of whether the modem option was specified.
901 void set_up_tty(int tty_fd, int local)
907 if (tcgetattr(tty_fd, &tios) < 0) {
908 if (!ok_error(errno))
909 fatal("tcgetattr: %m (line %d)", __LINE__);
916 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
917 tios.c_cflag |= CS8 | CREAD | HUPCL;
919 tios.c_iflag = IGNBRK | IGNPAR;
923 tios.c_cc[VTIME] = 0;
926 tios.c_cflag ^= (CLOCAL | HUPCL);
930 tios.c_cflag |= CRTSCTS;
934 tios.c_iflag |= IXON | IXOFF;
935 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
936 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
940 tios.c_cflag &= ~CRTSCTS;
947 speed = translate_speed(inspeed);
949 cfsetospeed (&tios, speed);
950 cfsetispeed (&tios, speed);
953 * We can't proceed if the serial port speed is B0,
954 * since that implies that the serial port is disabled.
957 speed = cfgetospeed(&tios);
959 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
962 while (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0 && !ok_error(errno))
964 fatal("tcsetattr: %m (line %d)", __LINE__);
966 baud_rate = baud_rate_of(speed);
970 /********************************************************************
972 * setdtr - control the DTR line on the serial port.
973 * This is called from die(), so it shouldn't call die().
976 void setdtr (int tty_fd, int on)
978 int modembits = TIOCM_DTR;
980 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
983 /********************************************************************
985 * restore_tty - restore the terminal to the saved settings.
988 void restore_tty (int tty_fd)
993 * Turn off echoing, because otherwise we can get into
994 * a loop with the tty and the modem echoing to each other.
995 * We presume we are the sole user of this tty device, so
996 * when we close it, it will revert to its defaults anyway.
999 inittermios.c_lflag &= ~(ECHO | ECHONL);
1001 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
1002 if (! ok_error (errno))
1003 warn("tcsetattr: %m (line %d)", __LINE__);
1008 /********************************************************************
1010 * output - Output PPP packet.
1013 void output (int unit, unsigned char *p, int len)
1018 dump_packet("sent", p, len);
1019 if (snoop_send_hook) snoop_send_hook(p, len);
1021 if (len < PPP_HDRLEN)
1023 if (new_style_driver) {
1026 proto = (p[0] << 8) + p[1];
1027 if (ppp_dev_fd >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
1030 if (write(fd, p, len) < 0) {
1031 if (errno == EWOULDBLOCK || errno == EAGAIN || errno == ENOBUFS
1032 || errno == ENXIO || errno == EIO || errno == EINTR)
1033 warn("write: warning: %m (%d)", errno);
1035 error("write: %m (%d)", errno);
1039 /********************************************************************
1041 * wait_input - wait until there is data available,
1042 * for the length of time specified by *timo (indefinite
1046 void wait_input(struct timeval *timo)
1053 n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
1054 if (n < 0 && errno != EINTR)
1055 fatal("select: %m");
1059 * add_fd - add an fd to the set that wait_input waits for.
1063 if (fd >= FD_SETSIZE)
1064 fatal("internal error: file descriptor too large (%d)", fd);
1065 FD_SET(fd, &in_fds);
1071 * remove_fd - remove an fd from the set that wait_input waits for.
1073 void remove_fd(int fd)
1075 FD_CLR(fd, &in_fds);
1079 /********************************************************************
1081 * read_packet - get a PPP packet from the serial device.
1084 int read_packet (unsigned char *buf)
1088 len = PPP_MRU + PPP_HDRLEN;
1089 if (new_style_driver) {
1090 *buf++ = PPP_ALLSTATIONS;
1097 nr = read(ppp_fd, buf, len);
1098 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN
1099 && errno != EIO && errno != EINTR)
1101 if (nr < 0 && errno == ENXIO)
1104 if (nr < 0 && new_style_driver && ppp_dev_fd >= 0 && !bundle_eof) {
1105 /* N.B. we read ppp_fd first since LCP packets come in there. */
1106 nr = read(ppp_dev_fd, buf, len);
1107 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN
1108 && errno != EIO && errno != EINTR)
1109 error("read /dev/ppp: %m");
1110 if (nr < 0 && errno == ENXIO)
1112 if (nr == 0 && doing_multilink) {
1113 remove_fd(ppp_dev_fd);
1117 if (new_style_driver && ppp_fd < 0 && ppp_dev_fd < 0)
1119 return (new_style_driver && nr > 0)? nr+2: nr;
1122 /********************************************************************
1124 * get_loop_output - get outgoing packets from the ppp device,
1125 * and detect when we want to bring the real link up.
1126 * Return value is 1 if we need to bring up the link, 0 otherwise.
1129 get_loop_output(void)
1134 if (new_style_driver) {
1135 while ((n = read_packet(inpacket_buf)) > 0)
1136 if (loop_frame(inpacket_buf, n))
1141 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
1142 if (loop_chars(inbuf, n))
1146 fatal("eof on loopback");
1148 if (errno != EWOULDBLOCK && errno != EAGAIN)
1149 fatal("read from loopback: %m(%d)", errno);
1155 * netif_set_mtu - set the MTU on the PPP network interface.
1158 netif_set_mtu(int unit, int mtu)
1162 memset (&ifr, '\0', sizeof (ifr));
1163 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1166 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
1167 error("ioctl(SIOCSIFMTU): %m (line %d)", __LINE__);
1171 * netif_get_mtu - get the MTU on the PPP network interface.
1174 netif_get_mtu(int unit)
1178 memset (&ifr, '\0', sizeof (ifr));
1179 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1181 if (ifunit >= 0 && ioctl(sock_fd, SIOCGIFMTU, (caddr_t) &ifr) < 0) {
1182 error("ioctl(SIOCGIFMTU): %m (line %d)", __LINE__);
1188 /********************************************************************
1190 * tty_send_config - configure the transmit characteristics of
1191 * the ppp interface.
1194 void tty_send_config(int mtu, u_int32_t asyncmap, int pcomp, int accomp)
1201 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
1202 if (errno != EIO && errno != ENOTTY)
1203 error("Couldn't set transmit async character map: %m");
1208 x = (pcomp? SC_COMP_PROT: 0) | (accomp? SC_COMP_AC: 0)
1209 | (sync_serial? SC_SYNC: 0);
1210 modify_flags(ppp_fd, SC_COMP_PROT|SC_COMP_AC|SC_SYNC, x);
1213 /********************************************************************
1215 * tty_set_xaccm - set the extended transmit ACCM for the interface.
1218 void tty_set_xaccm (ext_accm accm)
1222 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
1223 if ( ! ok_error (errno))
1224 warn("ioctl(set extended ACCM): %m (line %d)", __LINE__);
1228 /********************************************************************
1230 * tty_recv_config - configure the receive-side characteristics of
1231 * the ppp interface.
1234 void tty_recv_config(int mru, u_int32_t asyncmap, int pcomp, int accomp)
1237 * If we were called because the link has gone down then there is nothing
1238 * which may be done. Just return without incident.
1243 * Set the receiver parameters
1245 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
1246 if (errno != EIO && errno != ENOTTY)
1247 error("Couldn't set channel receive MRU: %m");
1249 if (new_style_driver && ppp_dev_fd >= 0
1250 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1251 error("Couldn't set MRU in generic PPP layer: %m");
1253 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
1254 if (errno != EIO && errno != ENOTTY)
1255 error("Couldn't set channel receive asyncmap: %m");
1259 /********************************************************************
1261 * ccp_test - ask kernel whether a given compression method
1262 * is acceptable for use.
1266 ccp_test(int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1268 struct ppp_option_data data;
1270 memset (&data, '\0', sizeof (data));
1272 data.length = opt_len;
1273 data.transmit = for_transmit;
1275 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1278 return (errno == ENOBUFS)? 0: -1;
1281 /********************************************************************
1283 * ccp_flags_set - inform kernel about the current state of CCP.
1286 void ccp_flags_set (int unit, int isopen, int isup)
1290 x = (isopen? SC_CCP_OPEN: 0) | (isup? SC_CCP_UP: 0);
1291 if (still_ppp() && ppp_dev_fd >= 0)
1292 modify_flags(ppp_dev_fd, SC_CCP_OPEN|SC_CCP_UP, x);
1297 * set_filters - set the active and pass filters in the kernel driver.
1299 int set_filters(struct bpf_program *pass, struct bpf_program *active)
1301 struct sock_fprog fp;
1303 fp.len = pass->bf_len;
1304 fp.filter = (struct sock_filter *) pass->bf_insns;
1305 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) {
1306 if (errno == ENOTTY)
1307 warn("kernel does not support PPP filtering");
1309 error("Couldn't set pass-filter in kernel: %m");
1312 fp.len = active->bf_len;
1313 fp.filter = (struct sock_filter *) active->bf_insns;
1314 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) {
1315 error("Couldn't set active-filter in kernel: %m");
1320 #endif /* PPP_FILTER */
1322 /********************************************************************
1324 * get_idle_time - return how long the link has been idle.
1327 get_idle_time(u, ip)
1329 struct ppp_idle *ip;
1331 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
1334 /********************************************************************
1336 * get_ppp_stats - return statistics for the link.
1339 get_ppp_stats(u, stats)
1341 struct pppd_stats *stats;
1343 struct ifpppstatsreq req;
1345 memset (&req, 0, sizeof (req));
1347 req.stats_ptr = (caddr_t) &req.stats;
1348 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
1349 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
1350 error("Couldn't get PPP statistics: %m");
1353 stats->bytes_in = req.stats.p.ppp_ibytes;
1354 stats->bytes_out = req.stats.p.ppp_obytes;
1355 stats->pkts_in = req.stats.p.ppp_ipackets;
1356 stats->pkts_out = req.stats.p.ppp_opackets;
1360 /********************************************************************
1362 * ccp_fatal_error - returns 1 if decompression was disabled as a
1363 * result of an error detected after decompression of a packet,
1364 * 0 otherwise. This is necessary because of patent nonsense.
1367 int ccp_fatal_error (int unit)
1371 if (ioctl(ppp_dev_fd, PPPIOCGFLAGS, &flags) < 0) {
1372 error("Couldn't read compression error flags: %m");
1375 return flags & SC_DC_FERROR;
1378 /********************************************************************
1380 * path_to_procfs - find the path to the proc file system mount point
1382 static char proc_path[MAXPATHLEN];
1383 static int proc_path_len;
1385 static char *path_to_procfs(const char *tail)
1387 struct mntent *mntent;
1390 if (proc_path_len == 0) {
1391 /* Default the mount location of /proc */
1392 strlcpy (proc_path, "/proc", sizeof(proc_path));
1394 fp = fopen(_PATH_MOUNTED, "r");
1396 while ((mntent = getmntent(fp)) != NULL) {
1397 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1399 if (strcmp(mntent->mnt_type, "proc") == 0) {
1400 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path));
1401 proc_path_len = strlen(proc_path);
1409 strlcpy(proc_path + proc_path_len, tail,
1410 sizeof(proc_path) - proc_path_len);
1415 * /proc/net/route parsing stuff.
1417 #define ROUTE_MAX_COLS 12
1418 FILE *route_fd = (FILE *) 0;
1419 static char route_buffer[512];
1420 static int route_dev_col, route_dest_col, route_gw_col;
1421 static int route_flags_col, route_mask_col;
1422 static int route_num_cols;
1424 static int open_route_table (void);
1425 static void close_route_table (void);
1426 static int read_route_table (struct rtentry *rt);
1428 /********************************************************************
1430 * close_route_table - close the interface to the route table
1433 static void close_route_table (void)
1435 if (route_fd != (FILE *) 0) {
1437 route_fd = (FILE *) 0;
1441 /********************************************************************
1443 * open_route_table - open the interface to the route table
1445 static char route_delims[] = " \t\n";
1447 static int open_route_table (void)
1451 close_route_table();
1453 path = path_to_procfs("/net/route");
1454 route_fd = fopen (path, "r");
1455 if (route_fd == NULL) {
1456 error("can't open routing table %s: %m", path);
1460 route_dev_col = 0; /* default to usual columns */
1463 route_flags_col = 3;
1467 /* parse header line */
1468 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1469 char *p = route_buffer, *q;
1471 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1473 if ((q = strtok(p, route_delims)) == 0)
1475 if (strcasecmp(q, "iface") == 0)
1476 route_dev_col = col;
1477 else if (strcasecmp(q, "destination") == 0)
1478 route_dest_col = col;
1479 else if (strcasecmp(q, "gateway") == 0)
1481 else if (strcasecmp(q, "flags") == 0)
1482 route_flags_col = col;
1483 else if (strcasecmp(q, "mask") == 0)
1484 route_mask_col = col;
1487 if (used && col >= route_num_cols)
1488 route_num_cols = col + 1;
1496 /********************************************************************
1498 * read_route_table - read the next entry from the route table
1501 static int read_route_table(struct rtentry *rt)
1503 char *cols[ROUTE_MAX_COLS], *p;
1506 memset (rt, '\0', sizeof (struct rtentry));
1508 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1512 for (col = 0; col < route_num_cols; ++col) {
1513 cols[col] = strtok(p, route_delims);
1514 if (cols[col] == NULL)
1515 return 0; /* didn't get enough columns */
1519 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
1520 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
1521 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
1523 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1524 rt->rt_dev = cols[route_dev_col];
1529 /********************************************************************
1531 * defaultroute_exists - determine if there is a default route
1534 static int defaultroute_exists (struct rtentry *rt)
1538 if (!open_route_table())
1541 while (read_route_table(rt) != 0) {
1542 if ((rt->rt_flags & RTF_UP) == 0)
1545 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
1547 if (SIN_ADDR(rt->rt_dst) == 0L) {
1553 close_route_table();
1558 * have_route_to - determine if the system has any route to
1559 * a given IP address. `addr' is in network byte order.
1560 * Return value is 1 if yes, 0 if no, -1 if don't know.
1561 * For demand mode to work properly, we have to ignore routes
1562 * through our own interface.
1564 int have_route_to(u_int32_t addr)
1569 if (!open_route_table())
1570 return -1; /* don't know */
1572 while (read_route_table(&rt)) {
1573 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1575 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) {
1581 close_route_table();
1585 /********************************************************************
1587 * sifdefaultroute - assign a default route through the address given.
1590 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1594 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1595 u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway);
1597 if (old_gateway != gateway)
1598 error("not replacing existing default route to %s [%I]",
1599 rt.rt_dev, old_gateway);
1603 memset (&rt, '\0', sizeof (rt));
1604 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1605 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1609 if (kernel_version > KVERSION(2,1,0)) {
1610 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1611 SIN_ADDR(rt.rt_genmask) = 0L;
1614 SIN_ADDR(rt.rt_gateway) = gateway;
1616 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1617 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1618 if ( ! ok_error ( errno ))
1619 error("default route ioctl(SIOCADDRT): %m");
1623 default_route_gateway = gateway;
1627 /********************************************************************
1629 * cifdefaultroute - delete a default route through the address given.
1632 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1636 default_route_gateway = 0;
1638 memset (&rt, '\0', sizeof (rt));
1639 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1640 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1642 if (kernel_version > KVERSION(2,1,0)) {
1643 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1644 SIN_ADDR(rt.rt_genmask) = 0L;
1647 SIN_ADDR(rt.rt_gateway) = gateway;
1649 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1650 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1652 if ( ! ok_error ( errno ))
1653 error("default route ioctl(SIOCDELRT): %m");
1661 /********************************************************************
1663 * sifproxyarp - Make a proxy ARP entry for the peer.
1666 int sifproxyarp (int unit, u_int32_t his_adr)
1668 struct arpreq arpreq;
1671 if (has_proxy_arp == 0) {
1672 memset (&arpreq, '\0', sizeof(arpreq));
1674 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1675 SIN_ADDR(arpreq.arp_pa) = his_adr;
1676 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1678 * Get the hardware address of an interface on the same subnet
1679 * as our local address.
1681 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1682 sizeof(proxy_arp_dev))) {
1683 error("Cannot determine ethernet address for proxy ARP");
1686 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1688 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1689 if ( ! ok_error ( errno ))
1690 error("ioctl(SIOCSARP): %m");
1693 proxy_arp_addr = his_adr;
1697 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward");
1698 if (forw_path != 0) {
1699 int fd = open(forw_path, O_WRONLY);
1701 if (write(fd, "1", 1) != 1)
1702 error("Couldn't enable IP forwarding: %m");
1712 /********************************************************************
1714 * cifproxyarp - Delete the proxy ARP entry for the peer.
1717 int cifproxyarp (int unit, u_int32_t his_adr)
1719 struct arpreq arpreq;
1721 if (has_proxy_arp) {
1723 memset (&arpreq, '\0', sizeof(arpreq));
1724 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1725 SIN_ADDR(arpreq.arp_pa) = his_adr;
1726 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1727 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1729 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1730 if ( ! ok_error ( errno ))
1731 warn("ioctl(SIOCDARP): %m");
1738 /********************************************************************
1740 * get_ether_addr - get the hardware address of an interface on the
1741 * the same subnet as ipaddr.
1744 static int get_ether_addr (u_int32_t ipaddr,
1745 struct sockaddr *hwaddr,
1746 char *name, int namelen)
1748 struct ifreq *ifr, *ifend;
1749 u_int32_t ina, mask;
1751 struct ifreq ifreq, bestifreq;
1753 struct ifreq ifs[MAX_IFS];
1755 u_int32_t bestmask=0;
1756 int found_interface = 0;
1758 ifc.ifc_len = sizeof(ifs);
1760 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1761 if ( ! ok_error ( errno ))
1762 error("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1767 * Scan through looking for an interface with an Internet
1768 * address on the same subnet as `ipaddr'.
1770 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1771 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1772 if (ifr->ifr_addr.sa_family == AF_INET) {
1773 ina = SIN_ADDR(ifr->ifr_addr);
1774 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1776 * Check that the interface is up, and not point-to-point
1779 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1782 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1785 * Get its netmask and check that it's on the right subnet.
1787 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1790 mask = SIN_ADDR(ifreq.ifr_addr);
1792 if (((ipaddr ^ ina) & mask) != 0)
1793 continue; /* no match */
1795 if (mask >= bestmask) {
1796 /* Compare using >= instead of > -- it is possible for
1797 an interface to have a netmask of 0.0.0.0 */
1798 found_interface = 1;
1805 if (!found_interface) return 0;
1807 strlcpy(name, bestifreq.ifr_name, namelen);
1809 /* trim off the :1 in eth0:1 */
1810 aliasp = strchr(name, ':');
1814 info("found interface %s for proxy arp", name);
1816 * Now get the hardware address.
1818 memset (&bestifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1819 if (ioctl (sock_fd, SIOCGIFHWADDR, &bestifreq) < 0) {
1820 error("SIOCGIFHWADDR(%s): %m", bestifreq.ifr_name);
1825 &bestifreq.ifr_hwaddr,
1826 sizeof (struct sockaddr));
1832 * get_if_hwaddr - get the hardware address for the specified
1833 * network interface device.
1836 get_if_hwaddr(u_char *addr, char *name)
1841 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
1844 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
1845 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
1846 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
1849 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
1854 * get_first_ethernet - return the name of the first ethernet-style
1855 * interface on this system.
1858 get_first_ethernet()
1863 /********************************************************************
1865 * Return user specified netmask, modified by any mask we might determine
1866 * for address `addr' (in network byte order).
1867 * Here we scan through the system's list of interfaces, looking for
1868 * any non-point-to-point interfaces which might appear to be on the same
1869 * network as `addr'. If we find any, we OR in their netmask to the
1870 * user-specified netmask.
1873 u_int32_t GetMask (u_int32_t addr)
1875 u_int32_t mask, nmask, ina;
1876 struct ifreq *ifr, *ifend, ifreq;
1878 struct ifreq ifs[MAX_IFS];
1882 if (IN_CLASSA(addr)) /* determine network mask for address class */
1883 nmask = IN_CLASSA_NET;
1884 else if (IN_CLASSB(addr))
1885 nmask = IN_CLASSB_NET;
1887 nmask = IN_CLASSC_NET;
1889 /* class D nets are disallowed by bad_ip_adrs */
1890 mask = netmask | htonl(nmask);
1892 * Scan through the system's network interfaces.
1894 ifc.ifc_len = sizeof(ifs);
1896 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1897 if ( ! ok_error ( errno ))
1898 warn("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1902 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1903 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1905 * Check the interface's internet address.
1907 if (ifr->ifr_addr.sa_family != AF_INET)
1909 ina = SIN_ADDR(ifr->ifr_addr);
1910 if (((ntohl(ina) ^ addr) & nmask) != 0)
1913 * Check that the interface is up, and not point-to-point nor loopback.
1915 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1916 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1919 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1922 * Get its netmask and OR it into our mask.
1924 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1926 mask |= SIN_ADDR(ifreq.ifr_addr);
1932 /********************************************************************
1934 * Internal routine to decode the version.modification.patch level
1937 static void decode_version (char *buf, int *version,
1938 int *modification, int *patch)
1942 *version = (int) strtoul (buf, &endp, 10);
1946 if (endp != buf && *endp == '.') {
1948 *modification = (int) strtoul (buf, &endp, 10);
1949 if (endp != buf && *endp == '.') {
1951 *patch = (int) strtoul (buf, &buf, 10);
1956 /********************************************************************
1958 * Procedure to determine if the PPP line discipline is registered.
1962 ppp_registered(void)
1970 * We used to open the serial device and set it to the ppp line
1971 * discipline here, in order to create a ppp unit. But that is
1972 * not a good idea - the user might have specified a device that
1973 * they can't open (permission, or maybe it doesn't really exist).
1974 * So we grab a pty master/slave pair and use that.
1976 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1977 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1982 * Try to put the device into the PPP discipline.
1984 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1985 error("ioctl(TIOCSETD(PPP)): %m (line %d)", __LINE__);
1994 /********************************************************************
1996 * ppp_available - check whether the system has any ppp interfaces
1997 * (in fact we check whether we can do an ioctl on ppp0).
2000 int ppp_available(void)
2005 int my_version, my_modification, my_patch;
2006 int osmaj, osmin, ospatch;
2009 "This system lacks kernel support for PPP. This could be because\n"
2010 "the PPP kernel module could not be loaded, or because PPP was not\n"
2011 "included in the kernel configuration. If PPP was included as a\n"
2012 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
2013 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
2014 "See README.linux file in the ppp distribution for more details.\n";
2016 /* get the kernel version now, since we are called before sys_init */
2018 osmaj = osmin = ospatch = 0;
2019 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
2020 kernel_version = KVERSION(osmaj, osmin, ospatch);
2022 fd = open("/dev/ppp", O_RDWR);
2024 if (fd < 0 && errno == ENOENT) {
2025 /* try making it and see if that helps. */
2026 if (mknod("/dev/ppp", S_IFCHR | S_IRUSR | S_IWUSR,
2027 makedev(108, 0)) >= 0) {
2028 fd = open("/dev/ppp", O_RDWR);
2030 info("Created /dev/ppp device node");
2032 unlink("/dev/ppp"); /* didn't work, undo the mknod */
2033 } else if (errno == EEXIST) {
2034 fd = open("/dev/ppp", O_RDWR);
2039 new_style_driver = 1;
2041 /* XXX should get from driver */
2043 driver_modification = 4;
2048 if (kernel_version >= KVERSION(2,3,13)) {
2049 if (errno == ENOENT)
2051 "pppd is unable to open the /dev/ppp device.\n"
2052 "You need to create the /dev/ppp device node by\n"
2053 "executing the following command as root:\n"
2054 " mknod /dev/ppp c 108 0\n";
2059 * Open a socket for doing the ioctl operations.
2061 s = socket(AF_INET, SOCK_DGRAM, 0);
2065 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2066 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2068 * If the device did not exist then attempt to create one by putting the
2069 * current tty into the PPP discipline. If this works then obtain the
2070 * flags for the device again.
2073 if (ppp_registered()) {
2074 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2075 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2079 * Ensure that the hardware address is for PPP and not something else
2082 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
2084 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
2088 * This is the PPP device. Validate the version of the driver at this
2089 * point to ensure that this program will work with the driver.
2092 char abBuffer [1024];
2094 ifr.ifr_data = abBuffer;
2095 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
2097 error("Couldn't read driver version: %m");
2099 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
2102 decode_version(abBuffer,
2104 &driver_modification,
2107 * Validate the version of the driver against the version that we used.
2109 decode_version(VERSION,
2114 /* The version numbers must match */
2115 if (driver_version != my_version)
2118 /* The modification levels must be legal */
2119 if (driver_modification < 3) {
2120 if (driver_modification >= 2) {
2121 /* we can cope with 2.2.0 and above */
2130 slprintf(route_buffer, sizeof(route_buffer),
2131 "Sorry - PPP driver version %d.%d.%d is out of date\n",
2132 driver_version, driver_modification, driver_patch);
2134 no_ppp_msg = route_buffer;
2141 /********************************************************************
2143 * Update the wtmp file with the appropriate user name and tty device.
2146 void logwtmp (const char *line, const char *name, const char *host)
2148 struct utmp ut, *utp;
2149 pid_t mypid = getpid();
2155 * Update the signon database for users.
2156 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
2158 utmpname(_PATH_UTMP);
2160 while ((utp = getutent()) && (utp->ut_pid != mypid))
2164 memcpy(&ut, utp, sizeof(ut));
2166 /* some gettys/telnetds don't initialize utmp... */
2167 memset(&ut, 0, sizeof(ut));
2169 if (ut.ut_id[0] == 0)
2170 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
2172 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
2173 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
2177 ut.ut_type = USER_PROCESS;
2180 /* Insert the host name if one is supplied */
2182 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
2184 /* Insert the IP address of the remote system if IP is enabled */
2185 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
2186 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
2187 sizeof(ut.ut_addr));
2189 /* CL: Makes sure that the logout works */
2190 if (*host == 0 && *name==0)
2196 * Update the wtmp file.
2199 updwtmp(_PATH_WTMP, &ut);
2201 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
2203 flock(wtmp, LOCK_EX);
2205 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut))
2206 warn("error writing %s: %m", _PATH_WTMP);
2208 flock(wtmp, LOCK_UN);
2216 /********************************************************************
2218 * sifvjcomp - config tcp header compression
2221 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2226 if (ioctl(ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0)
2227 error("Couldn't set up TCP header compression: %m");
2231 x = (vjcomp? SC_COMP_TCP: 0) | (cidcomp? 0: SC_NO_TCP_CCID);
2232 modify_flags(ppp_dev_fd, SC_COMP_TCP|SC_NO_TCP_CCID, x);
2237 /********************************************************************
2239 * sifup - Config the interface up and enable IP packets to pass.
2246 memset (&ifr, '\0', sizeof (ifr));
2247 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2248 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2249 if (! ok_error (errno))
2250 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2254 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2255 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2256 if (! ok_error (errno))
2257 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2265 /********************************************************************
2267 * sifdown - Disable the indicated protocol and config the interface
2268 * down if there are no remaining protocols.
2275 if (if_is_up && --if_is_up > 0)
2278 memset (&ifr, '\0', sizeof (ifr));
2279 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2280 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2281 if (! ok_error (errno))
2282 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2286 ifr.ifr_flags &= ~IFF_UP;
2287 ifr.ifr_flags |= IFF_POINTOPOINT;
2288 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2289 if (! ok_error (errno))
2290 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2296 /********************************************************************
2298 * sifaddr - Config the interface IP addresses and netmask.
2301 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2307 memset (&ifr, '\0', sizeof (ifr));
2308 memset (&rt, '\0', sizeof (rt));
2310 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2311 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2312 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2314 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2316 * Set our IP address
2318 SIN_ADDR(ifr.ifr_addr) = our_adr;
2319 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2320 if (errno != EEXIST) {
2321 if (! ok_error (errno))
2322 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2325 warn("ioctl(SIOCSIFADDR): Address already exists");
2330 * Set the gateway address
2332 SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
2333 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2334 if (! ok_error (errno))
2335 error("ioctl(SIOCSIFDSTADDR): %m (line %d)", __LINE__);
2340 * For recent kernels, force the netmask to 255.255.255.255.
2342 if (kernel_version >= KVERSION(2,1,16))
2344 if (net_mask != 0) {
2345 SIN_ADDR(ifr.ifr_netmask) = net_mask;
2346 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2347 if (! ok_error (errno))
2348 error("ioctl(SIOCSIFNETMASK): %m (line %d)", __LINE__);
2353 * Add the device route
2355 if (kernel_version < KVERSION(2,1,16)) {
2356 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2357 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2360 SIN_ADDR(rt.rt_gateway) = 0L;
2361 SIN_ADDR(rt.rt_dst) = his_adr;
2362 rt.rt_flags = RTF_UP | RTF_HOST;
2364 if (kernel_version > KVERSION(2,1,0)) {
2365 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2366 SIN_ADDR(rt.rt_genmask) = -1L;
2369 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2370 if (! ok_error (errno))
2371 error("ioctl(SIOCADDRT) device route: %m (line %d)", __LINE__);
2376 /* set ip_dynaddr in demand mode if address changes */
2377 if (demand && tune_kernel && !dynaddr_set
2378 && our_old_addr && our_old_addr != our_adr) {
2379 /* set ip_dynaddr if possible */
2383 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
2384 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
2385 if (write(fd, "1", 1) != 1)
2386 error("Couldn't enable dynamic IP addressing: %m");
2389 dynaddr_set = 1; /* only 1 attempt */
2396 /********************************************************************
2398 * cifaddr - Clear the interface IP addresses, and delete routes
2399 * through the interface if possible.
2402 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2406 if (kernel_version < KVERSION(2,1,16)) {
2408 * Delete the route through the device
2411 memset (&rt, '\0', sizeof (rt));
2413 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2414 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2417 SIN_ADDR(rt.rt_gateway) = 0;
2418 SIN_ADDR(rt.rt_dst) = his_adr;
2419 rt.rt_flags = RTF_UP | RTF_HOST;
2421 if (kernel_version > KVERSION(2,1,0)) {
2422 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2423 SIN_ADDR(rt.rt_genmask) = -1L;
2426 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2427 if (still_ppp() && ! ok_error (errno))
2428 error("ioctl(SIOCDELRT) device route: %m (line %d)", __LINE__);
2433 /* This way it is possible to have an IPX-only or IPv6-only interface */
2434 memset(&ifr, 0, sizeof(ifr));
2435 SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
2436 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2438 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2439 if (! ok_error (errno)) {
2440 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2445 our_old_addr = our_adr;
2451 /********************************************************************
2453 * sif6addr - Config the interface with an IPv6 link-local address
2455 int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2457 struct in6_ifreq ifr6;
2459 struct in6_rtmsg rt6;
2463 error("IPv6 socket creation failed: %m");
2466 memset(&ifr, 0, sizeof (ifr));
2467 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2468 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2469 error("sif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2473 /* Local interface */
2474 memset(&ifr6, 0, sizeof(ifr6));
2475 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2476 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2477 ifr6.ifr6_prefixlen = 10;
2479 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
2480 error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2484 /* Route to remote host */
2485 memset(&rt6, 0, sizeof(rt6));
2486 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
2487 rt6.rtmsg_flags = RTF_UP;
2488 rt6.rtmsg_dst_len = 10;
2489 rt6.rtmsg_ifindex = ifr.ifr_ifindex;
2490 rt6.rtmsg_metric = 1;
2492 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
2493 error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
2501 /********************************************************************
2503 * cif6addr - Remove IPv6 address from interface
2505 int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2508 struct in6_ifreq ifr6;
2512 error("IPv6 socket creation failed: %m");
2515 memset(&ifr, 0, sizeof(ifr));
2516 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2517 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2518 error("cif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2522 memset(&ifr6, 0, sizeof(ifr6));
2523 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2524 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2525 ifr6.ifr6_prefixlen = 10;
2527 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
2528 if (errno != EADDRNOTAVAIL) {
2529 if (! ok_error (errno))
2530 error("cif6addr: ioctl(SIOCDIFADDR): %m (line %d)", __LINE__);
2533 warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
2542 * get_pty - get a pty master/slave pair and chown the slave side
2543 * to the uid given. Assumes slave_name points to >= 16 bytes of space.
2546 get_pty(master_fdp, slave_fdp, slave_name, uid)
2552 int i, mfd, sfd = -1;
2554 struct termios tios;
2558 * Try the unix98 way first.
2560 mfd = open("/dev/ptmx", O_RDWR);
2563 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
2564 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
2565 chmod(pty_name, S_IRUSR | S_IWUSR);
2568 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
2569 warn("Couldn't unlock pty slave %s: %m", pty_name);
2571 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0)
2572 warn("Couldn't open pty slave %s: %m", pty_name);
2575 #endif /* TIOCGPTN */
2578 /* the old way - scan through the pty name space */
2579 for (i = 0; i < 64; ++i) {
2580 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2581 'p' + i / 16, i % 16);
2582 mfd = open(pty_name, O_RDWR, 0);
2585 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2587 fchown(sfd, uid, -1);
2588 fchmod(sfd, S_IRUSR | S_IWUSR);
2599 strlcpy(slave_name, pty_name, 16);
2602 if (tcgetattr(sfd, &tios) == 0) {
2603 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2604 tios.c_cflag |= CS8 | CREAD | CLOCAL;
2605 tios.c_iflag = IGNPAR;
2608 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2609 warn("couldn't set attributes on pty: %m");
2611 warn("couldn't get attributes on pty: %m");
2616 /********************************************************************
2618 * open_loopback - open the device we use for getting packets
2619 * in demand mode. Under Linux, we use a pty master/slave pair.
2622 open_ppp_loopback(void)
2627 if (new_style_driver) {
2628 /* allocate ourselves a ppp unit */
2629 if (make_ppp_unit() < 0)
2631 modify_flags(ppp_dev_fd, 0, SC_LOOP_TRAFFIC);
2632 set_kdebugflag(kdebugflag);
2637 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2638 fatal("No free pty for loopback");
2640 set_ppp_fd(slave_fd);
2642 flags = fcntl(master_fd, F_GETFL);
2644 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2645 warn("couldn't set master loopback to nonblock: %m");
2647 flags = fcntl(ppp_fd, F_GETFL);
2649 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2650 warn("couldn't set slave loopback to nonblock: %m");
2652 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2653 fatal("ioctl(TIOCSETD): %m (line %d)", __LINE__);
2655 * Find out which interface we were given.
2657 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2658 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
2660 * Enable debug in the driver if requested.
2662 set_kdebugflag (kdebugflag);
2667 /********************************************************************
2669 * sifnpmode - Set the mode for handling packets for a given NP.
2673 sifnpmode(u, proto, mode)
2680 npi.protocol = proto;
2682 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2683 if (! ok_error (errno))
2684 error("ioctl(PPPIOCSNPMODE, %d, %d): %m", proto, mode);
2691 /********************************************************************
2693 * sipxfaddr - Config the interface IPX networknumber
2696 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2703 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2705 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2707 if (! ok_error (errno))
2708 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2712 memset (&ifr, '\0', sizeof (ifr));
2713 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2715 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2716 sipx->sipx_family = AF_IPX;
2717 sipx->sipx_port = 0;
2718 sipx->sipx_network = htonl (network);
2719 sipx->sipx_type = IPX_FRAME_ETHERII;
2720 sipx->sipx_action = IPX_CRTITF;
2722 * Set the IPX device
2724 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2726 if (errno != EEXIST) {
2727 if (! ok_error (errno))
2728 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (line %d)", __LINE__);
2731 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2740 /********************************************************************
2742 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2743 * are removed and the device is no longer able to pass IPX
2747 int cipxfaddr (int unit)
2754 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2756 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2758 if (! ok_error (errno))
2759 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2763 memset (&ifr, '\0', sizeof (ifr));
2764 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2766 sipx->sipx_type = IPX_FRAME_ETHERII;
2767 sipx->sipx_action = IPX_DLTITF;
2768 sipx->sipx_family = AF_IPX;
2770 * Set the IPX device
2772 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2773 if (! ok_error (errno))
2774 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (line %d)", __LINE__);
2784 * Use the hostname as part of the random number seed.
2793 for (p = hostname; *p != 0; ++p)
2798 /********************************************************************
2800 * sys_check_options - check the options that the user specified
2804 sys_check_options(void)
2808 * Disable the IPX protocol if the support is not present in the kernel.
2812 if (ipxcp_protent.enabled_flag) {
2813 struct stat stat_buf;
2814 if ((path = path_to_procfs("/net/ipx/interface")) == 0
2815 || (path = path_to_procfs("/net/ipx_interface")) == 0
2816 || lstat(path, &stat_buf) < 0) {
2817 error("IPX support is not present in the kernel\n");
2818 ipxcp_protent.enabled_flag = 0;
2822 if (demand && driver_is_old) {
2823 option_error("demand dialling is not supported by kernel driver "
2824 "version %d.%d.%d", driver_version, driver_modification,
2828 if (multilink && !new_style_driver) {
2829 warn("Warning: multilink is not supported by the kernel driver");
2837 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
2839 * convert the 48-bit MAC address of eth0 into EUI 64. caller also assumes
2840 * that the system has a properly configured Ethernet interface for this
2841 * function to return non-zero.
2844 ether_to_eui64(eui64_t *p_eui64)
2848 const unsigned char *ptr;
2850 skfd = socket(PF_INET6, SOCK_DGRAM, 0);
2853 warn("could not open IPv6 socket");
2857 strcpy(ifr.ifr_name, "eth0");
2858 if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
2861 warn("could not obtain hardware address for eth0");
2867 * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
2869 ptr = ifr.ifr_hwaddr.sa_data;
2870 p_eui64->e8[0] = ptr[0] | 0x02;
2871 p_eui64->e8[1] = ptr[1];
2872 p_eui64->e8[2] = ptr[2];
2873 p_eui64->e8[3] = 0xFF;
2874 p_eui64->e8[4] = 0xFE;
2875 p_eui64->e8[5] = ptr[3];
2876 p_eui64->e8[6] = ptr[4];
2877 p_eui64->e8[7] = ptr[5];