2 * sys-linux.c - System-dependent procedures for setting up
3 * PPP interfaces on Linux systems
5 * Copyright (c) 1989 Carnegie Mellon University.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 #include <sys/ioctl.h>
22 #include <sys/types.h>
23 #include <sys/socket.h>
25 #include <sys/errno.h>
28 #include <sys/utsname.h>
29 #include <sys/sysmacros.h>
45 /* This is in netdevice.h. However, this compile will fail miserably if
46 you attempt to include netdevice.h because it has so many references
47 to __memcpy functions which it should not attempt to do. So, since I
48 really don't use it, but it must be defined, define it now. */
51 #define MAX_ADDR_LEN 7
55 #include <asm/types.h> /* glibc 2 conflicts with linux/types.h */
57 #include <net/if_arp.h>
58 #include <net/route.h>
59 #include <netinet/if_ether.h>
61 #include <linux/types.h>
63 #include <linux/if_arp.h>
64 #include <linux/route.h>
65 #include <linux/if_ether.h>
67 #include <netinet/in.h>
68 #include <arpa/inet.h>
70 #include <linux/ppp_defs.h>
71 #include <linux/if_ppp.h>
79 #if __GLIBC__ >= 2 && \
80 !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
81 #include <netipx/ipx.h>
83 #include <linux/ipx.h>
85 #endif /* IPX_CHANGE */
89 #include <linux/filter.h>
90 #endif /* PPP_FILTER */
93 #include <sys/locks.h>
99 * This is in linux/include/net/ipv6.h.
103 struct in6_addr ifr6_addr;
104 __u32 ifr6_prefixlen;
105 unsigned int ifr6_ifindex;
109 #define IN6_LLADDR_FROM_EUI64(sin6, eui64) do { \
110 memset(&sin6.s6_addr, 0, sizeof(struct in6_addr)); \
111 sin6.s6_addr16[0] = htons(0xfe80); \
112 eui64_copy(eui64, sin6.s6_addr32[2]); \
117 /* We can get an EIO error on an ioctl if the modem has hung up */
118 #define ok_error(num) ((num)==EIO)
120 static int tty_disc = N_TTY; /* The TTY discipline */
121 static int ppp_disc = N_PPP; /* The PPP discpline */
122 static int initfdflags = -1; /* Initial file descriptor flags for fd */
123 static int ppp_fd = -1; /* fd which is set to PPP discipline */
124 static int sock_fd = -1; /* socket for doing interface ioctls */
125 static int slave_fd = -1;
126 static int master_fd = -1;
128 static int sock6_fd = -1;
130 int ppp_dev_fd = -1; /* fd for /dev/ppp (new style driver) */
131 static int chindex; /* channel index (new style driver) */
133 static fd_set in_fds; /* set of fds that wait_input waits for */
134 static int max_in_fd; /* highest fd set in in_fds */
136 static int has_proxy_arp = 0;
137 static int driver_version = 0;
138 static int driver_modification = 0;
139 static int driver_patch = 0;
140 static int driver_is_old = 0;
141 static int restore_term = 0; /* 1 => we've munged the terminal */
142 static struct termios inittermios; /* Initial TTY termios */
144 int new_style_driver = 0;
146 static char loop_name[20];
147 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
149 static int if_is_up; /* Interface has been marked up */
150 static u_int32_t default_route_gateway; /* Gateway for default route added */
151 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
152 static char proxy_arp_dev[16]; /* Device for proxy arp entry */
153 static u_int32_t our_old_addr; /* for detecting address changes */
154 static int dynaddr_set; /* 1 if ip_dynaddr set */
155 static int looped; /* 1 if using loop */
156 static int link_mtu; /* mtu for the link (not bundle) */
158 static struct utsname utsname; /* for the kernel version */
159 static int kernel_version;
160 #define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
164 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
165 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
166 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
168 #define SIN_ADDR(x) (((struct sockaddr_in *) (&(x)))->sin_addr.s_addr)
170 /* Prototypes for procedures local to this file. */
171 static int get_flags (int fd);
172 static void set_flags (int fd, int flags);
173 static int translate_speed (int bps);
174 static int baud_rate_of (int speed);
175 static void close_route_table (void);
176 static int open_route_table (void);
177 static int read_route_table (struct rtentry *rt);
178 static int defaultroute_exists (struct rtentry *rt);
179 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
180 char *name, int namelen);
181 static void decode_version (char *buf, int *version, int *mod, int *patch);
182 static int set_kdebugflag(int level);
183 static int ppp_registered(void);
184 static int make_ppp_unit(void);
186 extern u_char inpacket_buf[]; /* borrowed from main.c */
189 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
193 #define SET_SA_FAMILY(addr, family) \
194 memset ((char *) &(addr), '\0', sizeof(addr)); \
195 addr.sa_family = (family);
198 * Determine if the PPP connection should still be present.
203 /* new_fd is the fd of a tty */
204 static void set_ppp_fd (int new_fd)
206 SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", new_fd));
208 if (!new_style_driver)
212 static int still_ppp(void)
214 if (new_style_driver)
215 return !hungup && ppp_fd >= 0;
216 if (!hungup || ppp_fd == slave_fd)
219 set_ppp_fd(slave_fd);
225 /********************************************************************
227 * Functions to read and set the flags value in the device driver
230 static int get_flags (int fd)
234 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
235 if ( ok_error (errno) )
238 fatal("ioctl(PPPIOCGFLAGS): %m (line %d)", __LINE__);
241 SYSDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
245 /********************************************************************/
247 static void set_flags (int fd, int flags)
249 SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
251 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) {
252 if (! ok_error (errno) )
253 fatal("ioctl(PPPIOCSFLAGS, %x): %m (line %d)", flags, errno, __LINE__);
257 /********************************************************************
259 * sys_init - System-dependent initialization.
266 if (new_style_driver) {
267 ppp_dev_fd = open("/dev/ppp", O_RDWR);
269 fatal("Couldn't open /dev/ppp: %m");
270 flags = fcntl(ppp_dev_fd, F_GETFL);
272 || fcntl(ppp_dev_fd, F_SETFL, flags | O_NONBLOCK) == -1)
273 warn("Couldn't set /dev/ppp to nonblock: %m");
276 /* Get an internet socket for doing socket ioctls. */
277 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
279 fatal("Couldn't create IP socket: %m(%d)", errno);
282 sock6_fd = socket(AF_INET6, SOCK_DGRAM, 0);
284 sock6_fd = -errno; /* save errno for later */
291 /********************************************************************
293 * sys_cleanup - restore any system state we modified before exiting:
294 * mark the interface down, delete default route and/or proxy arp entry.
295 * This shouldn't call die() because it's called from die().
298 void sys_cleanup(void)
301 * Take down the device
308 * Delete any routes through the device.
310 if (default_route_gateway != 0)
311 cifdefaultroute(0, 0, default_route_gateway);
314 cifproxyarp(0, proxy_arp_addr);
317 /********************************************************************
319 * sys_close - Clean up in a child process before execing.
324 if (new_style_driver)
335 /********************************************************************
337 * set_kdebugflag - Define the debugging level for the kernel
340 static int set_kdebugflag (int requested_level)
342 if (new_style_driver && ifunit < 0)
344 if (ioctl(ppp_dev_fd, PPPIOCSDEBUG, &requested_level) < 0) {
345 if ( ! ok_error (errno) )
346 error("ioctl(PPPIOCSDEBUG): %m (line %d)", __LINE__);
349 SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
354 /********************************************************************
356 * tty_establish_ppp - Turn the serial port into a ppp interface.
359 int tty_establish_ppp (int tty_fd)
364 * Ensure that the tty device is in exclusive mode.
366 if (ioctl(tty_fd, TIOCEXCL, 0) < 0) {
367 if ( ! ok_error ( errno ))
368 warn("Couldn't make tty exclusive: %m");
371 * Demand mode - prime the old ppp device to relinquish the unit.
373 if (!new_style_driver && looped
374 && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0) {
375 error("ioctl(transfer ppp unit): %m, line %d", __LINE__);
379 * Set the current tty to the PPP discpline
383 #define N_SYNC_PPP 14
385 ppp_disc = (new_style_driver && sync_serial)? N_SYNC_PPP: N_PPP;
386 if (ioctl(tty_fd, TIOCSETD, &ppp_disc) < 0) {
387 if ( ! ok_error (errno) ) {
388 error("Couldn't set tty to PPP discipline: %m");
393 ret_fd = generic_establish_ppp(tty_fd);
395 #define SC_RCVB (SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP)
396 #define SC_LOGB (SC_DEBUG | SC_LOG_INPKT | SC_LOG_OUTPKT | SC_LOG_RAWIN \
400 set_flags(ppp_fd, ((get_flags(ppp_fd) & ~(SC_RCVB | SC_LOGB))
401 | ((kdebugflag * SC_DEBUG) & SC_LOGB)));
403 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0 && !ok_error(errno))
404 warn("Couldn't reset tty to normal line discipline: %m");
410 /********************************************************************
412 * generic_establish_ppp - Turn the fd into a ppp interface.
414 int generic_establish_ppp (int fd)
418 if (new_style_driver) {
419 /* Open another instance of /dev/ppp and connect the channel to it */
422 if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
423 error("Couldn't get channel number: %m");
426 dbglog("using channel %d", chindex);
427 fd = open("/dev/ppp", O_RDWR);
429 error("Couldn't reopen /dev/ppp: %m");
432 if (ioctl(fd, PPPIOCATTCHAN, &chindex) < 0) {
433 error("Couldn't attach to channel %d: %m", chindex);
436 flags = fcntl(fd, F_GETFL);
437 if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
438 warn("Couldn't set /dev/ppp (channel) to nonblock: %m");
443 if (!looped && !multilink) {
445 * Create a new PPP unit.
447 if (make_ppp_unit() < 0)
452 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) & ~SC_LOOP_TRAFFIC);
456 if (ioctl(fd, PPPIOCCONNECT, &ifunit) < 0) {
457 error("Couldn't attach to PPP unit %d: %m", ifunit);
464 * Old-style driver: find out which interface we were given.
467 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
468 if (ok_error (errno))
470 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
472 /* Check that we got the same unit again. */
473 if (looped && x != ifunit)
474 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
478 * Fetch the initial file flags and reset blocking mode on the file.
480 initfdflags = fcntl(fd, F_GETFL);
481 if (initfdflags == -1 ||
482 fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
483 if ( ! ok_error (errno))
484 warn("Couldn't set device to non-blocking mode: %m");
491 * Enable debug in the driver if requested.
494 set_kdebugflag (kdebugflag);
496 SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
497 driver_version, driver_modification, driver_patch));
507 /********************************************************************
509 * tty_disestablish_ppp - Restore the serial port to normal operation.
510 * This shouldn't call die() because it's called from die().
513 void tty_disestablish_ppp(int tty_fd)
517 * Flush the tty output buffer so that the TIOCSETD doesn't hang.
519 if (tcflush(tty_fd, TCIOFLUSH) < 0)
521 warn("tcflush failed: %m");
525 * Restore the previous line discipline
527 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
528 if ( ! ok_error (errno))
529 error("ioctl(TIOCSETD, N_TTY): %m (line %d)", __LINE__);
532 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
533 if ( ! ok_error (errno))
534 warn("ioctl(TIOCNXCL): %m (line %d)", __LINE__);
537 /* Reset non-blocking mode on fd. */
538 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
539 if ( ! ok_error (errno))
540 warn("Couldn't restore device fd flags: %m");
546 generic_disestablish_ppp(tty_fd);
549 /********************************************************************
551 * generic_disestablish_ppp - Restore device components to normal
552 * operation, and reconnect the ppp unit to the loopback if in demand
553 * mode. This shouldn't call die() because it's called from die().
555 void generic_disestablish_ppp(int dev_fd)
557 if (new_style_driver) {
561 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_LOOP_TRAFFIC);
563 } else if (ifunit >= 0 && ioctl(ppp_dev_fd, PPPIOCDETACH) < 0)
564 error("Couldn't release PPP unit: %m");
566 remove_fd(ppp_dev_fd);
568 /* old-style driver */
570 set_ppp_fd(slave_fd);
575 * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
576 * Assumes new_style_driver.
578 static int make_ppp_unit()
583 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
584 if (x < 0 && req_unit >= 0 && errno == EEXIST) {
585 warn("Couldn't allocate PPP unit %d as it is already in use", req_unit);
587 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
590 error("Couldn't create new ppp unit: %m");
595 * cfg_bundle - configure the existing bundle.
596 * Used in demand mode.
598 void cfg_bundle(int mrru, int mtru, int rssn, int tssn)
602 if (!new_style_driver)
605 /* set the mrru, mtu and flags */
606 if (ioctl(ppp_dev_fd, PPPIOCSMRRU, &mrru) < 0)
607 error("Couldn't set MRRU: %m");
608 flags = get_flags(ppp_dev_fd);
609 flags &= ~(SC_MP_SHORTSEQ | SC_MP_XSHORTSEQ);
610 flags |= (rssn? SC_MP_SHORTSEQ: 0) | (tssn? SC_MP_XSHORTSEQ: 0)
611 | (mrru? SC_MULTILINK: 0);
613 set_flags(ppp_dev_fd, flags);
615 /* connect up the channel */
616 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0)
617 fatal("Couldn't attach to PPP unit %d: %m", ifunit);
622 * make_new_bundle - create a new PPP unit (i.e. a bundle)
623 * and connect our channel to it. This should only get called
624 * if `multilink' was set at the time establish_ppp was called.
625 * In demand mode this uses our existing bundle instead of making
628 void make_new_bundle(int mrru, int mtru, int rssn, int tssn)
630 if (!new_style_driver)
633 /* make us a ppp unit */
634 if (make_ppp_unit() < 0)
637 /* set the mrru and flags */
638 cfg_bundle(mrru, mtru, rssn, tssn);
642 * bundle_attach - attach our link to a given PPP unit.
643 * We assume the unit is controlled by another pppd.
645 int bundle_attach(int ifnum)
647 if (!new_style_driver)
650 if (ioctl(ppp_dev_fd, PPPIOCATTACH, &ifnum) < 0) {
652 return 0; /* doesn't still exist */
653 fatal("Couldn't attach to interface unit %d: %m\n", ifnum);
655 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifnum) < 0)
656 fatal("Couldn't connect to interface unit %d: %m", ifnum);
657 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_MULTILINK);
663 /********************************************************************
665 * clean_check - Fetch the flags for the device and generate
666 * appropriate error messages.
668 void clean_check(void)
674 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
676 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
678 s = "all had bit 7 set to 1";
682 s = "all had bit 7 set to 0";
686 s = "all had odd parity";
690 s = "all had even parity";
695 warn("Receive serial link is not 8-bit clean:");
696 warn("Problem: %s", s);
704 * List of valid speeds.
708 int speed_int, speed_val;
791 /********************************************************************
793 * Translate from bits/second to a speed_t.
796 static int translate_speed (int bps)
798 struct speed *speedp;
801 for (speedp = speeds; speedp->speed_int; speedp++) {
802 if (bps == speedp->speed_int)
803 return speedp->speed_val;
805 warn("speed %d not supported", bps);
810 /********************************************************************
812 * Translate from a speed_t to bits/second.
815 static int baud_rate_of (int speed)
817 struct speed *speedp;
820 for (speedp = speeds; speedp->speed_int; speedp++) {
821 if (speed == speedp->speed_val)
822 return speedp->speed_int;
828 /********************************************************************
830 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
831 * at the requested speed, etc. If `local' is true, set CLOCAL
832 * regardless of whether the modem option was specified.
835 void set_up_tty(int tty_fd, int local)
841 if (tcgetattr(tty_fd, &tios) < 0) {
842 if (!ok_error(errno))
843 fatal("tcgetattr: %m (line %d)", __LINE__);
850 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
851 tios.c_cflag |= CS8 | CREAD | HUPCL;
853 tios.c_iflag = IGNBRK | IGNPAR;
857 tios.c_cc[VTIME] = 0;
860 tios.c_cflag ^= (CLOCAL | HUPCL);
864 tios.c_cflag |= CRTSCTS;
868 tios.c_iflag |= IXON | IXOFF;
869 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
870 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
874 tios.c_cflag &= ~CRTSCTS;
881 speed = translate_speed(inspeed);
883 cfsetospeed (&tios, speed);
884 cfsetispeed (&tios, speed);
887 * We can't proceed if the serial port speed is B0,
888 * since that implies that the serial port is disabled.
891 speed = cfgetospeed(&tios);
893 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
896 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
897 if (!ok_error(errno))
898 fatal("tcsetattr: %m (line %d)", __LINE__);
900 baud_rate = baud_rate_of(speed);
904 /********************************************************************
906 * setdtr - control the DTR line on the serial port.
907 * This is called from die(), so it shouldn't call die().
910 void setdtr (int tty_fd, int on)
912 int modembits = TIOCM_DTR;
914 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
917 /********************************************************************
919 * restore_tty - restore the terminal to the saved settings.
922 void restore_tty (int tty_fd)
927 * Turn off echoing, because otherwise we can get into
928 * a loop with the tty and the modem echoing to each other.
929 * We presume we are the sole user of this tty device, so
930 * when we close it, it will revert to its defaults anyway.
933 inittermios.c_lflag &= ~(ECHO | ECHONL);
935 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
936 if (! ok_error (errno))
937 warn("tcsetattr: %m (line %d)", __LINE__);
942 /********************************************************************
944 * output - Output PPP packet.
947 void output (int unit, unsigned char *p, int len)
952 dump_packet("sent", p, len);
953 if (snoop_send_hook) snoop_send_hook(p, len);
955 if (len < PPP_HDRLEN)
957 if (new_style_driver) {
960 proto = (p[0] << 8) + p[1];
961 if (ifunit >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
964 if (write(fd, p, len) < 0) {
965 if (errno == EWOULDBLOCK || errno == ENOBUFS
966 || errno == ENXIO || errno == EIO || errno == EINTR)
967 warn("write: warning: %m (%d)", errno);
969 error("write: %m (%d)", errno);
973 /********************************************************************
975 * wait_input - wait until there is data available,
976 * for the length of time specified by *timo (indefinite
980 void wait_input(struct timeval *timo)
987 n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
988 if (n < 0 && errno != EINTR)
993 * add_fd - add an fd to the set that wait_input waits for.
1003 * remove_fd - remove an fd from the set that wait_input waits for.
1005 void remove_fd(int fd)
1007 FD_CLR(fd, &in_fds);
1011 /********************************************************************
1013 * read_packet - get a PPP packet from the serial device.
1016 int read_packet (unsigned char *buf)
1020 len = PPP_MRU + PPP_HDRLEN;
1021 if (new_style_driver) {
1022 *buf++ = PPP_ALLSTATIONS;
1028 nr = read(ppp_fd, buf, len);
1029 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
1031 if (nr < 0 && errno == ENXIO)
1034 if (nr < 0 && new_style_driver && ifunit >= 0) {
1035 /* N.B. we read ppp_fd first since LCP packets come in there. */
1036 nr = read(ppp_dev_fd, buf, len);
1037 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
1038 error("read /dev/ppp: %m");
1039 if (nr < 0 && errno == ENXIO)
1042 return (new_style_driver && nr > 0)? nr+2: nr;
1045 /********************************************************************
1047 * get_loop_output - get outgoing packets from the ppp device,
1048 * and detect when we want to bring the real link up.
1049 * Return value is 1 if we need to bring up the link, 0 otherwise.
1052 get_loop_output(void)
1057 if (new_style_driver) {
1058 while ((n = read_packet(inpacket_buf)) > 0)
1059 if (loop_frame(inpacket_buf, n))
1064 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
1065 if (loop_chars(inbuf, n))
1069 fatal("eof on loopback");
1071 if (errno != EWOULDBLOCK)
1072 fatal("read from loopback: %m(%d)", errno);
1078 * netif_set_mtu - set the MTU on the PPP network interface.
1081 netif_set_mtu(int unit, int mtu)
1085 SYSDEBUG ((LOG_DEBUG, "netif_set_mtu: mtu = %d\n", mtu));
1087 memset (&ifr, '\0', sizeof (ifr));
1088 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1091 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
1092 error("ioctl(SIOCSIFMTU): %m (line %d)", __LINE__);
1096 * netif_get_mtu - get the MTU on the PPP network interface.
1099 netif_get_mtu(int unit)
1103 memset (&ifr, '\0', sizeof (ifr));
1104 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1106 if (ifunit >= 0 && ioctl(sock_fd, SIOCGIFMTU, (caddr_t) &ifr) < 0) {
1107 error("ioctl(SIOCGIFMTU): %m (line %d)", __LINE__);
1113 /********************************************************************
1115 * tty_send_config - configure the transmit characteristics of
1116 * the ppp interface.
1119 void tty_send_config (int mtu,u_int32_t asyncmap,int pcomp,int accomp)
1124 * Set the asyncmap and other parameters for the ppp device
1129 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
1130 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
1131 if (!ok_error(errno))
1132 fatal("ioctl(PPPIOCSASYNCMAP): %m (line %d)", __LINE__);
1136 x = get_flags(ppp_fd);
1137 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
1138 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
1139 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
1140 set_flags(ppp_fd, x);
1143 /********************************************************************
1145 * tty_set_xaccm - set the extended transmit ACCM for the interface.
1148 void tty_set_xaccm (ext_accm accm)
1150 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
1151 accm[0], accm[1], accm[2], accm[3]));
1155 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
1156 if ( ! ok_error (errno))
1157 warn("ioctl(set extended ACCM): %m (line %d)", __LINE__);
1161 /********************************************************************
1163 * tty_recv_config - configure the receive-side characteristics of
1164 * the ppp interface.
1167 void tty_recv_config (int mru,u_int32_t asyncmap,int pcomp,int accomp)
1169 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
1171 * If we were called because the link has gone down then there is nothing
1172 * which may be done. Just return without incident.
1177 * Set the receiver parameters
1179 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
1180 if ( ! ok_error (errno))
1181 error("ioctl(PPPIOCSMRU): %m (line %d)", __LINE__);
1183 if (new_style_driver && ifunit >= 0
1184 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1185 error("Couldn't set MRU in generic PPP layer: %m");
1187 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
1188 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
1189 if (!ok_error(errno))
1190 error("ioctl(PPPIOCSRASYNCMAP): %m (line %d)", __LINE__);
1194 /********************************************************************
1196 * ccp_test - ask kernel whether a given compression method
1197 * is acceptable for use.
1201 ccp_test(int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1203 struct ppp_option_data data;
1205 memset (&data, '\0', sizeof (data));
1207 data.length = opt_len;
1208 data.transmit = for_transmit;
1210 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1213 return (errno == ENOBUFS)? 0: -1;
1216 /********************************************************************
1218 * ccp_flags_set - inform kernel about the current state of CCP.
1221 void ccp_flags_set (int unit, int isopen, int isup)
1223 if (still_ppp() && ifunit >= 0) {
1224 int x = get_flags(ppp_dev_fd);
1225 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
1226 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
1227 set_flags (ppp_dev_fd, x);
1233 * set_filters - set the active and pass filters in the kernel driver.
1235 int set_filters(struct bpf_program *pass, struct bpf_program *active)
1237 struct sock_fprog fp;
1239 fp.len = pass->bf_len;
1240 fp.filter = (struct sock_filter *) pass->bf_insns;
1241 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) {
1242 if (errno == ENOTTY)
1243 warn("kernel does not support PPP filtering");
1245 error("Couldn't set pass-filter in kernel: %m");
1248 fp.len = active->bf_len;
1249 fp.filter = (struct sock_filter *) active->bf_insns;
1250 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) {
1251 error("Couldn't set active-filter in kernel: %m");
1256 #endif /* PPP_FILTER */
1258 /********************************************************************
1260 * get_idle_time - return how long the link has been idle.
1263 get_idle_time(u, ip)
1265 struct ppp_idle *ip;
1267 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
1270 /********************************************************************
1272 * get_ppp_stats - return statistics for the link.
1275 get_ppp_stats(u, stats)
1277 struct pppd_stats *stats;
1279 struct ifpppstatsreq req;
1281 memset (&req, 0, sizeof (req));
1283 req.stats_ptr = (caddr_t) &req.stats;
1284 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
1285 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
1286 error("Couldn't get PPP statistics: %m");
1289 stats->bytes_in = req.stats.p.ppp_ibytes;
1290 stats->bytes_out = req.stats.p.ppp_obytes;
1291 stats->pkts_in = req.stats.p.ppp_ipackets;
1292 stats->pkts_out = req.stats.p.ppp_opackets;
1296 /********************************************************************
1298 * ccp_fatal_error - returns 1 if decompression was disabled as a
1299 * result of an error detected after decompression of a packet,
1300 * 0 otherwise. This is necessary because of patent nonsense.
1303 int ccp_fatal_error (int unit)
1305 int x = get_flags(ppp_dev_fd);
1307 return x & SC_DC_FERROR;
1310 /********************************************************************
1312 * path_to_procfs - find the path to the proc file system mount point
1314 static char proc_path[MAXPATHLEN];
1315 static int proc_path_len;
1317 static char *path_to_procfs(const char *tail)
1319 struct mntent *mntent;
1322 if (proc_path_len == 0) {
1323 /* Default the mount location of /proc */
1324 strlcpy (proc_path, "/proc", sizeof(proc_path));
1326 fp = fopen(MOUNTED, "r");
1328 while ((mntent = getmntent(fp)) != NULL) {
1329 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1331 if (strcmp(mntent->mnt_type, "proc") == 0) {
1332 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path));
1333 proc_path_len = strlen(proc_path);
1341 strlcpy(proc_path + proc_path_len, tail,
1342 sizeof(proc_path) - proc_path_len);
1347 * /proc/net/route parsing stuff.
1349 #define ROUTE_MAX_COLS 12
1350 FILE *route_fd = (FILE *) 0;
1351 static char route_buffer[512];
1352 static int route_dev_col, route_dest_col, route_gw_col;
1353 static int route_flags_col, route_mask_col;
1354 static int route_num_cols;
1356 static int open_route_table (void);
1357 static void close_route_table (void);
1358 static int read_route_table (struct rtentry *rt);
1360 /********************************************************************
1362 * close_route_table - close the interface to the route table
1365 static void close_route_table (void)
1367 if (route_fd != (FILE *) 0) {
1369 route_fd = (FILE *) 0;
1373 /********************************************************************
1375 * open_route_table - open the interface to the route table
1377 static char route_delims[] = " \t\n";
1379 static int open_route_table (void)
1383 close_route_table();
1385 path = path_to_procfs("/net/route");
1386 route_fd = fopen (path, "r");
1387 if (route_fd == NULL) {
1388 error("can't open routing table %s: %m", path);
1392 route_dev_col = 0; /* default to usual columns */
1395 route_flags_col = 3;
1399 /* parse header line */
1400 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1401 char *p = route_buffer, *q;
1403 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1405 if ((q = strtok(p, route_delims)) == 0)
1407 if (strcasecmp(q, "iface") == 0)
1408 route_dev_col = col;
1409 else if (strcasecmp(q, "destination") == 0)
1410 route_dest_col = col;
1411 else if (strcasecmp(q, "gateway") == 0)
1413 else if (strcasecmp(q, "flags") == 0)
1414 route_flags_col = col;
1415 else if (strcasecmp(q, "mask") == 0)
1416 route_mask_col = col;
1419 if (used && col >= route_num_cols)
1420 route_num_cols = col + 1;
1428 /********************************************************************
1430 * read_route_table - read the next entry from the route table
1433 static int read_route_table(struct rtentry *rt)
1435 char *cols[ROUTE_MAX_COLS], *p;
1438 memset (rt, '\0', sizeof (struct rtentry));
1440 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1444 for (col = 0; col < route_num_cols; ++col) {
1445 cols[col] = strtok(p, route_delims);
1446 if (cols[col] == NULL)
1447 return 0; /* didn't get enough columns */
1451 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
1452 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
1453 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
1455 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1456 rt->rt_dev = cols[route_dev_col];
1461 /********************************************************************
1463 * defaultroute_exists - determine if there is a default route
1466 static int defaultroute_exists (struct rtentry *rt)
1470 if (!open_route_table())
1473 while (read_route_table(rt) != 0) {
1474 if ((rt->rt_flags & RTF_UP) == 0)
1477 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
1479 if (SIN_ADDR(rt->rt_dst) == 0L) {
1485 close_route_table();
1490 * have_route_to - determine if the system has any route to
1491 * a given IP address. `addr' is in network byte order.
1492 * Return value is 1 if yes, 0 if no, -1 if don't know.
1493 * For demand mode to work properly, we have to ignore routes
1494 * through our own interface.
1496 int have_route_to(u_int32_t addr)
1501 if (!open_route_table())
1502 return -1; /* don't know */
1504 while (read_route_table(&rt)) {
1505 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1507 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) {
1513 close_route_table();
1517 /********************************************************************
1519 * sifdefaultroute - assign a default route through the address given.
1522 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1526 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1527 u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway);
1529 if (old_gateway != gateway)
1530 error("not replacing existing default route to %s [%I]",
1531 rt.rt_dev, old_gateway);
1535 memset (&rt, '\0', sizeof (rt));
1536 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1537 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1541 if (kernel_version > KVERSION(2,1,0)) {
1542 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1543 SIN_ADDR(rt.rt_genmask) = 0L;
1546 SIN_ADDR(rt.rt_gateway) = gateway;
1548 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1549 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1550 if ( ! ok_error ( errno ))
1551 error("default route ioctl(SIOCADDRT): %m");
1555 default_route_gateway = gateway;
1559 /********************************************************************
1561 * cifdefaultroute - delete a default route through the address given.
1564 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1568 default_route_gateway = 0;
1570 memset (&rt, '\0', sizeof (rt));
1571 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1572 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1574 if (kernel_version > KVERSION(2,1,0)) {
1575 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1576 SIN_ADDR(rt.rt_genmask) = 0L;
1579 SIN_ADDR(rt.rt_gateway) = gateway;
1581 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1582 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1584 if ( ! ok_error ( errno ))
1585 error("default route ioctl(SIOCDELRT): %m");
1593 /********************************************************************
1595 * sifproxyarp - Make a proxy ARP entry for the peer.
1598 int sifproxyarp (int unit, u_int32_t his_adr)
1600 struct arpreq arpreq;
1603 if (has_proxy_arp == 0) {
1604 memset (&arpreq, '\0', sizeof(arpreq));
1606 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1607 SIN_ADDR(arpreq.arp_pa) = his_adr;
1608 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1610 * Get the hardware address of an interface on the same subnet
1611 * as our local address.
1613 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1614 sizeof(proxy_arp_dev))) {
1615 error("Cannot determine ethernet address for proxy ARP");
1618 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1620 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1621 if ( ! ok_error ( errno ))
1622 error("ioctl(SIOCSARP): %m");
1625 proxy_arp_addr = his_adr;
1629 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward");
1630 if (forw_path != 0) {
1631 int fd = open(forw_path, O_WRONLY);
1633 if (write(fd, "1", 1) != 1)
1634 error("Couldn't enable IP forwarding: %m");
1644 /********************************************************************
1646 * cifproxyarp - Delete the proxy ARP entry for the peer.
1649 int cifproxyarp (int unit, u_int32_t his_adr)
1651 struct arpreq arpreq;
1653 if (has_proxy_arp) {
1655 memset (&arpreq, '\0', sizeof(arpreq));
1656 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1657 SIN_ADDR(arpreq.arp_pa) = his_adr;
1658 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1659 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1661 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1662 if ( ! ok_error ( errno ))
1663 warn("ioctl(SIOCDARP): %m");
1670 /********************************************************************
1672 * get_ether_addr - get the hardware address of an interface on the
1673 * the same subnet as ipaddr.
1676 static int get_ether_addr (u_int32_t ipaddr,
1677 struct sockaddr *hwaddr,
1678 char *name, int namelen)
1680 struct ifreq *ifr, *ifend;
1681 u_int32_t ina, mask;
1683 struct ifreq ifreq, bestifreq;
1685 struct ifreq ifs[MAX_IFS];
1687 u_int32_t bestmask=0;
1688 int found_interface = 0;
1690 ifc.ifc_len = sizeof(ifs);
1692 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1693 if ( ! ok_error ( errno ))
1694 error("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1698 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1699 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1701 * Scan through looking for an interface with an Internet
1702 * address on the same subnet as `ipaddr'.
1704 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1705 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1706 if (ifr->ifr_addr.sa_family == AF_INET) {
1707 ina = SIN_ADDR(ifr->ifr_addr);
1708 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1709 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1712 * Check that the interface is up, and not point-to-point
1715 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1718 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1721 * Get its netmask and check that it's on the right subnet.
1723 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1726 mask = SIN_ADDR(ifreq.ifr_addr);
1727 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1728 ip_ntoa(ina), ntohl(mask)));
1730 if (((ipaddr ^ ina) & mask) != 0)
1731 continue; /* no match */
1733 if (mask >= bestmask) {
1734 /* Compare using >= instead of > -- it is possible for
1735 an interface to have a netmask of 0.0.0.0 */
1736 found_interface = 1;
1743 if (!found_interface) return 0;
1745 strlcpy(name, bestifreq.ifr_name, namelen);
1747 /* trim off the :1 in eth0:1 */
1748 aliasp = strchr(name, ':');
1752 info("found interface %s for proxy arp", name);
1754 * Now get the hardware address.
1756 memset (&bestifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1757 if (ioctl (sock_fd, SIOCGIFHWADDR, &bestifreq) < 0) {
1758 error("SIOCGIFHWADDR(%s): %m", bestifreq.ifr_name);
1763 &bestifreq.ifr_hwaddr,
1764 sizeof (struct sockaddr));
1766 SYSDEBUG ((LOG_DEBUG,
1767 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1768 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1769 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1770 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1771 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1772 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1773 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1774 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1775 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1780 * get_if_hwaddr - get the hardware address for the specified
1781 * network interface device.
1784 get_if_hwaddr(u_char *addr, char *name)
1789 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
1792 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
1793 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
1794 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
1797 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
1802 * get_first_ethernet - return the name of the first ethernet-style
1803 * interface on this system.
1806 get_first_ethernet()
1811 /********************************************************************
1813 * Return user specified netmask, modified by any mask we might determine
1814 * for address `addr' (in network byte order).
1815 * Here we scan through the system's list of interfaces, looking for
1816 * any non-point-to-point interfaces which might appear to be on the same
1817 * network as `addr'. If we find any, we OR in their netmask to the
1818 * user-specified netmask.
1821 u_int32_t GetMask (u_int32_t addr)
1823 u_int32_t mask, nmask, ina;
1824 struct ifreq *ifr, *ifend, ifreq;
1826 struct ifreq ifs[MAX_IFS];
1830 if (IN_CLASSA(addr)) /* determine network mask for address class */
1831 nmask = IN_CLASSA_NET;
1832 else if (IN_CLASSB(addr))
1833 nmask = IN_CLASSB_NET;
1835 nmask = IN_CLASSC_NET;
1837 /* class D nets are disallowed by bad_ip_adrs */
1838 mask = netmask | htonl(nmask);
1840 * Scan through the system's network interfaces.
1842 ifc.ifc_len = sizeof(ifs);
1844 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1845 if ( ! ok_error ( errno ))
1846 warn("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1850 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1851 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1853 * Check the interface's internet address.
1855 if (ifr->ifr_addr.sa_family != AF_INET)
1857 ina = SIN_ADDR(ifr->ifr_addr);
1858 if (((ntohl(ina) ^ addr) & nmask) != 0)
1861 * Check that the interface is up, and not point-to-point nor loopback.
1863 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1864 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1867 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1870 * Get its netmask and OR it into our mask.
1872 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1874 mask |= SIN_ADDR(ifreq.ifr_addr);
1880 /********************************************************************
1882 * Internal routine to decode the version.modification.patch level
1885 static void decode_version (char *buf, int *version,
1886 int *modification, int *patch)
1890 *version = (int) strtoul (buf, &endp, 10);
1894 if (endp != buf && *endp == '.') {
1896 *modification = (int) strtoul (buf, &endp, 10);
1897 if (endp != buf && *endp == '.') {
1899 *patch = (int) strtoul (buf, &buf, 10);
1904 /********************************************************************
1906 * Procedure to determine if the PPP line discipline is registered.
1910 ppp_registered(void)
1918 * We used to open the serial device and set it to the ppp line
1919 * discipline here, in order to create a ppp unit. But that is
1920 * not a good idea - the user might have specified a device that
1921 * they can't open (permission, or maybe it doesn't really exist).
1922 * So we grab a pty master/slave pair and use that.
1924 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1925 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1930 * Try to put the device into the PPP discipline.
1932 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1933 error("ioctl(TIOCSETD(PPP)): %m (line %d)", __LINE__);
1942 /********************************************************************
1944 * ppp_available - check whether the system has any ppp interfaces
1945 * (in fact we check whether we can do an ioctl on ppp0).
1948 int ppp_available(void)
1953 int my_version, my_modification, my_patch;
1954 int osmaj, osmin, ospatch;
1957 "This system lacks kernel support for PPP. This could be because\n"
1958 "the PPP kernel module could not be loaded, or because PPP was not\n"
1959 "included in the kernel configuration. If PPP was included as a\n"
1960 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
1961 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
1962 "See README.linux file in the ppp distribution for more details.\n";
1964 /* get the kernel version now, since we are called before sys_init */
1966 osmaj = osmin = ospatch = 0;
1967 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
1968 kernel_version = KVERSION(osmaj, osmin, ospatch);
1970 fd = open("/dev/ppp", O_RDWR);
1972 if (fd < 0 && errno == ENOENT) {
1973 /* try making it and see if that helps. */
1974 if (mknod("/dev/ppp", S_IFCHR | S_IRUSR | S_IWUSR,
1975 makedev(108, 0)) >= 0) {
1976 fd = open("/dev/ppp", O_RDWR);
1978 info("Created /dev/ppp device node");
1980 unlink("/dev/ppp"); /* didn't work, undo the mknod */
1981 } else if (errno == EEXIST) {
1982 fd = open("/dev/ppp", O_RDWR);
1987 new_style_driver = 1;
1989 /* XXX should get from driver */
1991 driver_modification = 4;
1996 if (kernel_version >= KVERSION(2,3,13)) {
1997 if (errno == ENOENT)
1999 "pppd is unable to open the /dev/ppp device.\n"
2000 "You need to create the /dev/ppp device node by\n"
2001 "executing the following command as root:\n"
2002 " mknod /dev/ppp c 108 0\n";
2007 * Open a socket for doing the ioctl operations.
2009 s = socket(AF_INET, SOCK_DGRAM, 0);
2013 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2014 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2016 * If the device did not exist then attempt to create one by putting the
2017 * current tty into the PPP discipline. If this works then obtain the
2018 * flags for the device again.
2021 if (ppp_registered()) {
2022 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
2023 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
2027 * Ensure that the hardware address is for PPP and not something else
2030 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
2032 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
2036 * This is the PPP device. Validate the version of the driver at this
2037 * point to ensure that this program will work with the driver.
2040 char abBuffer [1024];
2042 ifr.ifr_data = abBuffer;
2043 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
2045 error("Couldn't read driver version: %m");
2047 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
2050 decode_version(abBuffer,
2052 &driver_modification,
2055 * Validate the version of the driver against the version that we used.
2057 decode_version(VERSION,
2062 /* The version numbers must match */
2063 if (driver_version != my_version)
2066 /* The modification levels must be legal */
2067 if (driver_modification < 3) {
2068 if (driver_modification >= 2) {
2069 /* we can cope with 2.2.0 and above */
2078 slprintf(route_buffer, sizeof(route_buffer),
2079 "Sorry - PPP driver version %d.%d.%d is out of date\n",
2080 driver_version, driver_modification, driver_patch);
2082 no_ppp_msg = route_buffer;
2089 /********************************************************************
2091 * Update the wtmp file with the appropriate user name and tty device.
2094 void logwtmp (const char *line, const char *name, const char *host)
2096 struct utmp ut, *utp;
2097 pid_t mypid = getpid();
2103 * Update the signon database for users.
2104 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
2106 utmpname(_PATH_UTMP);
2108 while ((utp = getutent()) && (utp->ut_pid != mypid))
2112 memcpy(&ut, utp, sizeof(ut));
2114 /* some gettys/telnetds don't initialize utmp... */
2115 memset(&ut, 0, sizeof(ut));
2117 if (ut.ut_id[0] == 0)
2118 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
2120 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
2121 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
2125 ut.ut_type = USER_PROCESS;
2128 /* Insert the host name if one is supplied */
2130 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
2132 /* Insert the IP address of the remote system if IP is enabled */
2133 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
2134 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
2135 sizeof(ut.ut_addr));
2137 /* CL: Makes sure that the logout works */
2138 if (*host == 0 && *name==0)
2144 * Update the wtmp file.
2147 updwtmp(_PATH_WTMP, &ut);
2149 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
2151 flock(wtmp, LOCK_EX);
2153 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut))
2154 warn("error writing %s: %m", _PATH_WTMP);
2156 flock(wtmp, LOCK_UN);
2164 /********************************************************************
2166 * sifvjcomp - config tcp header compression
2169 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2171 u_int x = get_flags(ppp_dev_fd);
2174 if (ioctl (ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
2175 if (! ok_error (errno))
2176 error("ioctl(PPPIOCSMAXCID): %m (line %d)", __LINE__);
2181 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
2182 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
2183 set_flags (ppp_dev_fd, x);
2188 /********************************************************************
2190 * sifup - Config the interface up and enable IP packets to pass.
2197 memset (&ifr, '\0', sizeof (ifr));
2198 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2199 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2200 if (! ok_error (errno))
2201 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2205 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2206 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2207 if (! ok_error (errno))
2208 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2216 /********************************************************************
2218 * sifdown - Disable the indicated protocol and config the interface
2219 * down if there are no remaining protocols.
2226 if (if_is_up && --if_is_up > 0)
2229 memset (&ifr, '\0', sizeof (ifr));
2230 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2231 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2232 if (! ok_error (errno))
2233 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2237 ifr.ifr_flags &= ~IFF_UP;
2238 ifr.ifr_flags |= IFF_POINTOPOINT;
2239 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2240 if (! ok_error (errno))
2241 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2247 /********************************************************************
2249 * sifaddr - Config the interface IP addresses and netmask.
2252 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2258 memset (&ifr, '\0', sizeof (ifr));
2259 memset (&rt, '\0', sizeof (rt));
2261 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2262 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2263 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2265 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2267 * Set our IP address
2269 SIN_ADDR(ifr.ifr_addr) = our_adr;
2270 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2271 if (errno != EEXIST) {
2272 if (! ok_error (errno))
2273 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2276 warn("ioctl(SIOCSIFADDR): Address already exists");
2281 * Set the gateway address
2283 SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
2284 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2285 if (! ok_error (errno))
2286 error("ioctl(SIOCSIFDSTADDR): %m (line %d)", __LINE__);
2291 * For recent kernels, force the netmask to 255.255.255.255.
2293 if (kernel_version >= KVERSION(2,1,16))
2295 if (net_mask != 0) {
2296 SIN_ADDR(ifr.ifr_netmask) = net_mask;
2297 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2298 if (! ok_error (errno))
2299 error("ioctl(SIOCSIFNETMASK): %m (line %d)", __LINE__);
2304 * Add the device route
2306 if (kernel_version < KVERSION(2,1,16)) {
2307 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2308 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2311 SIN_ADDR(rt.rt_gateway) = 0L;
2312 SIN_ADDR(rt.rt_dst) = his_adr;
2313 rt.rt_flags = RTF_UP | RTF_HOST;
2315 if (kernel_version > KVERSION(2,1,0)) {
2316 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2317 SIN_ADDR(rt.rt_genmask) = -1L;
2320 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2321 if (! ok_error (errno))
2322 error("ioctl(SIOCADDRT) device route: %m (line %d)", __LINE__);
2327 /* set ip_dynaddr in demand mode if address changes */
2328 if (demand && tune_kernel && !dynaddr_set
2329 && our_old_addr && our_old_addr != our_adr) {
2330 /* set ip_dynaddr if possible */
2334 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
2335 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
2336 if (write(fd, "1", 1) != 1)
2337 error("Couldn't enable dynamic IP addressing: %m");
2340 dynaddr_set = 1; /* only 1 attempt */
2347 /********************************************************************
2349 * cifaddr - Clear the interface IP addresses, and delete routes
2350 * through the interface if possible.
2353 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2357 if (kernel_version < KVERSION(2,1,16)) {
2359 * Delete the route through the device
2362 memset (&rt, '\0', sizeof (rt));
2364 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2365 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2368 SIN_ADDR(rt.rt_gateway) = 0;
2369 SIN_ADDR(rt.rt_dst) = his_adr;
2370 rt.rt_flags = RTF_UP | RTF_HOST;
2372 if (kernel_version > KVERSION(2,1,0)) {
2373 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2374 SIN_ADDR(rt.rt_genmask) = -1L;
2377 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2378 if (still_ppp() && ! ok_error (errno))
2379 error("ioctl(SIOCDELRT) device route: %m (line %d)", __LINE__);
2384 /* This way it is possible to have an IPX-only or IPv6-only interface */
2385 memset(&ifr, 0, sizeof(ifr));
2386 SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
2387 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2389 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2390 if (! ok_error (errno)) {
2391 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2396 our_old_addr = our_adr;
2402 /********************************************************************
2404 * sif6addr - Config the interface with an IPv6 link-local address
2406 int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2408 struct in6_ifreq ifr6;
2410 struct in6_rtmsg rt6;
2414 error("IPv6 socket creation failed: %m");
2417 memset(&ifr, 0, sizeof (ifr));
2418 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2419 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2420 error("sif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2424 /* Local interface */
2425 memset(&ifr6, 0, sizeof(ifr6));
2426 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2427 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2428 ifr6.ifr6_prefixlen = 10;
2430 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
2431 error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2435 /* Route to remote host */
2436 memset(&rt6, 0, sizeof(rt6));
2437 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
2438 rt6.rtmsg_flags = RTF_UP;
2439 rt6.rtmsg_dst_len = 10;
2440 rt6.rtmsg_ifindex = ifr.ifr_ifindex;
2441 rt6.rtmsg_metric = 1;
2443 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
2444 error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
2452 /********************************************************************
2454 * cif6addr - Remove IPv6 address from interface
2456 int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2459 struct in6_ifreq ifr6;
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("cif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2473 memset(&ifr6, 0, sizeof(ifr6));
2474 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2475 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2476 ifr6.ifr6_prefixlen = 10;
2478 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
2479 if (errno != EADDRNOTAVAIL) {
2480 if (! ok_error (errno))
2481 error("cif6addr: ioctl(SIOCDIFADDR): %m (line %d)", __LINE__);
2484 warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
2493 * get_pty - get a pty master/slave pair and chown the slave side
2494 * to the uid given. Assumes slave_name points to >= 16 bytes of space.
2497 get_pty(master_fdp, slave_fdp, slave_name, uid)
2503 int i, mfd, sfd = -1;
2505 struct termios tios;
2509 * Try the unix98 way first.
2511 mfd = open("/dev/ptmx", O_RDWR);
2514 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
2515 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
2516 chmod(pty_name, S_IRUSR | S_IWUSR);
2519 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
2520 warn("Couldn't unlock pty slave %s: %m", pty_name);
2522 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0)
2523 warn("Couldn't open pty slave %s: %m", pty_name);
2526 #endif /* TIOCGPTN */
2529 /* the old way - scan through the pty name space */
2530 for (i = 0; i < 64; ++i) {
2531 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2532 'p' + i / 16, i % 16);
2533 mfd = open(pty_name, O_RDWR, 0);
2536 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2538 fchown(sfd, uid, -1);
2539 fchmod(sfd, S_IRUSR | S_IWUSR);
2550 strlcpy(slave_name, pty_name, 16);
2553 if (tcgetattr(sfd, &tios) == 0) {
2554 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2555 tios.c_cflag |= CS8 | CREAD | CLOCAL;
2556 tios.c_iflag = IGNPAR;
2559 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2560 warn("couldn't set attributes on pty: %m");
2562 warn("couldn't get attributes on pty: %m");
2567 /********************************************************************
2569 * open_loopback - open the device we use for getting packets
2570 * in demand mode. Under Linux, we use a pty master/slave pair.
2573 open_ppp_loopback(void)
2578 if (new_style_driver) {
2579 /* allocate ourselves a ppp unit */
2580 if (make_ppp_unit() < 0)
2582 set_flags(ppp_dev_fd, SC_LOOP_TRAFFIC);
2583 set_kdebugflag(kdebugflag);
2588 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2589 fatal("No free pty for loopback");
2590 SYSDEBUG(("using %s for loopback", loop_name));
2592 set_ppp_fd(slave_fd);
2594 flags = fcntl(master_fd, F_GETFL);
2596 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2597 warn("couldn't set master loopback to nonblock: %m");
2599 flags = fcntl(ppp_fd, F_GETFL);
2601 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2602 warn("couldn't set slave loopback to nonblock: %m");
2604 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2605 fatal("ioctl(TIOCSETD): %m (line %d)", __LINE__);
2607 * Find out which interface we were given.
2609 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2610 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
2612 * Enable debug in the driver if requested.
2614 set_kdebugflag (kdebugflag);
2619 /********************************************************************
2621 * sifnpmode - Set the mode for handling packets for a given NP.
2625 sifnpmode(u, proto, mode)
2632 npi.protocol = proto;
2634 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2635 if (! ok_error (errno))
2636 error("ioctl(PPPIOCSNPMODE, %d, %d): %m", proto, mode);
2643 /********************************************************************
2645 * sipxfaddr - Config the interface IPX networknumber
2648 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2655 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2657 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2659 if (! ok_error (errno))
2660 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2664 memset (&ifr, '\0', sizeof (ifr));
2665 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2667 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2668 sipx->sipx_family = AF_IPX;
2669 sipx->sipx_port = 0;
2670 sipx->sipx_network = htonl (network);
2671 sipx->sipx_type = IPX_FRAME_ETHERII;
2672 sipx->sipx_action = IPX_CRTITF;
2674 * Set the IPX device
2676 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2678 if (errno != EEXIST) {
2679 if (! ok_error (errno))
2680 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (line %d)", __LINE__);
2683 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2692 /********************************************************************
2694 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2695 * are removed and the device is no longer able to pass IPX
2699 int cipxfaddr (int unit)
2706 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2708 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2710 if (! ok_error (errno))
2711 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2715 memset (&ifr, '\0', sizeof (ifr));
2716 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2718 sipx->sipx_type = IPX_FRAME_ETHERII;
2719 sipx->sipx_action = IPX_DLTITF;
2720 sipx->sipx_family = AF_IPX;
2722 * Set the IPX device
2724 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2725 if (! ok_error (errno))
2726 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (line %d)", __LINE__);
2736 * Use the hostname as part of the random number seed.
2745 for (p = hostname; *p != 0; ++p)
2750 /********************************************************************
2752 * sys_check_options - check the options that the user specified
2756 sys_check_options(void)
2760 * Disable the IPX protocol if the support is not present in the kernel.
2764 if (ipxcp_protent.enabled_flag) {
2765 struct stat stat_buf;
2766 if ((path = path_to_procfs("/net/ipx_interface")) == 0
2767 || lstat(path, &stat_buf) < 0) {
2768 error("IPX support is not present in the kernel\n");
2769 ipxcp_protent.enabled_flag = 0;
2773 if (demand && driver_is_old) {
2774 option_error("demand dialling is not supported by kernel driver "
2775 "version %d.%d.%d", driver_version, driver_modification,
2779 if (multilink && !new_style_driver) {
2780 warn("Warning: multilink is not supported by the kernel driver");
2788 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
2790 * convert the 48-bit MAC address of eth0 into EUI 64. caller also assumes
2791 * that the system has a properly configured Ethernet interface for this
2792 * function to return non-zero.
2795 ether_to_eui64(eui64_t *p_eui64)
2799 const unsigned char *ptr;
2801 skfd = socket(PF_INET6, SOCK_DGRAM, 0);
2804 warn("could not open IPv6 socket");
2808 strcpy(ifr.ifr_name, "eth0");
2809 if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
2812 warn("could not obtain hardware address for eth0");
2818 * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
2820 ptr = ifr.ifr_hwaddr.sa_data;
2821 p_eui64->e8[0] = ptr[0] | 0x02;
2822 p_eui64->e8[1] = ptr[1];
2823 p_eui64->e8[2] = ptr[2];
2824 p_eui64->e8[3] = 0xFF;
2825 p_eui64->e8[4] = 0xFE;
2826 p_eui64->e8[5] = ptr[3];
2827 p_eui64->e8[6] = ptr[4];
2828 p_eui64->e8[7] = ptr[5];