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 static 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)
520 warn("tcflush failed: %m");
522 * Restore the previous line discipline
524 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
525 if ( ! ok_error (errno))
526 error("ioctl(TIOCSETD, N_TTY): %m (line %d)", __LINE__);
529 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
530 if ( ! ok_error (errno))
531 warn("ioctl(TIOCNXCL): %m (line %d)", __LINE__);
534 /* Reset non-blocking mode on fd. */
535 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
536 if ( ! ok_error (errno))
537 warn("Couldn't restore device fd flags: %m");
542 generic_disestablish_ppp(tty_fd);
545 /********************************************************************
547 * generic_disestablish_ppp - Restore device components to normal
548 * operation, and reconnect the ppp unit to the loopback if in demand
549 * mode. This shouldn't call die() because it's called from die().
551 void generic_disestablish_ppp(int dev_fd)
553 if (new_style_driver) {
557 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_LOOP_TRAFFIC);
559 } else if (ifunit >= 0 && ioctl(ppp_dev_fd, PPPIOCDETACH) < 0)
560 error("Couldn't release PPP unit: %m");
562 remove_fd(ppp_dev_fd);
564 /* old-style driver */
566 set_ppp_fd(slave_fd);
571 * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
572 * Assumes new_style_driver.
574 static int make_ppp_unit()
579 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
580 if (x < 0 && req_unit >= 0 && errno == EEXIST) {
581 warn("Couldn't allocate PPP unit %d as it is already in use");
583 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
586 error("Couldn't create new ppp unit: %m");
591 * cfg_bundle - configure the existing bundle.
592 * Used in demand mode.
594 void cfg_bundle(int mrru, int mtru, int rssn, int tssn)
598 if (!new_style_driver)
601 /* set the mrru, mtu and flags */
602 if (ioctl(ppp_dev_fd, PPPIOCSMRRU, &mrru) < 0)
603 error("Couldn't set MRRU: %m");
604 flags = get_flags(ppp_dev_fd);
605 flags &= ~(SC_MP_SHORTSEQ | SC_MP_XSHORTSEQ);
606 flags |= (rssn? SC_MP_SHORTSEQ: 0) | (tssn? SC_MP_XSHORTSEQ: 0)
607 | (mrru? SC_MULTILINK: 0);
609 set_flags(ppp_dev_fd, flags);
611 /* connect up the channel */
612 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0)
613 fatal("Couldn't attach to PPP unit %d: %m", ifunit);
618 * make_new_bundle - create a new PPP unit (i.e. a bundle)
619 * and connect our channel to it. This should only get called
620 * if `multilink' was set at the time establish_ppp was called.
621 * In demand mode this uses our existing bundle instead of making
624 void make_new_bundle(int mrru, int mtru, int rssn, int tssn)
626 if (!new_style_driver)
629 /* make us a ppp unit */
630 if (make_ppp_unit() < 0)
633 /* set the mrru and flags */
634 cfg_bundle(mrru, mtru, rssn, tssn);
638 * bundle_attach - attach our link to a given PPP unit.
639 * We assume the unit is controlled by another pppd.
641 int bundle_attach(int ifnum)
643 if (!new_style_driver)
646 if (ioctl(ppp_dev_fd, PPPIOCATTACH, &ifnum) < 0) {
648 return 0; /* doesn't still exist */
649 fatal("Couldn't attach to interface unit %d: %m\n", ifnum);
651 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifnum) < 0)
652 fatal("Couldn't connect to interface unit %d: %m", ifnum);
653 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_MULTILINK);
659 /********************************************************************
661 * clean_check - Fetch the flags for the device and generate
662 * appropriate error messages.
664 void clean_check(void)
670 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
672 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
674 s = "all had bit 7 set to 1";
678 s = "all had bit 7 set to 0";
682 s = "all had odd parity";
686 s = "all had even parity";
691 warn("Receive serial link is not 8-bit clean:");
692 warn("Problem: %s", s);
700 * List of valid speeds.
704 int speed_int, speed_val;
787 /********************************************************************
789 * Translate from bits/second to a speed_t.
792 static int translate_speed (int bps)
794 struct speed *speedp;
797 for (speedp = speeds; speedp->speed_int; speedp++) {
798 if (bps == speedp->speed_int)
799 return speedp->speed_val;
801 warn("speed %d not supported", bps);
806 /********************************************************************
808 * Translate from a speed_t to bits/second.
811 static int baud_rate_of (int speed)
813 struct speed *speedp;
816 for (speedp = speeds; speedp->speed_int; speedp++) {
817 if (speed == speedp->speed_val)
818 return speedp->speed_int;
824 /********************************************************************
826 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
827 * at the requested speed, etc. If `local' is true, set CLOCAL
828 * regardless of whether the modem option was specified.
831 void set_up_tty(int tty_fd, int local)
837 if (tcgetattr(tty_fd, &tios) < 0) {
838 if (!ok_error(errno))
839 fatal("tcgetattr: %m (line %d)", __LINE__);
846 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
847 tios.c_cflag |= CS8 | CREAD | HUPCL;
849 tios.c_iflag = IGNBRK | IGNPAR;
853 tios.c_cc[VTIME] = 0;
856 tios.c_cflag ^= (CLOCAL | HUPCL);
860 tios.c_cflag |= CRTSCTS;
864 tios.c_iflag |= IXON | IXOFF;
865 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
866 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
870 tios.c_cflag &= ~CRTSCTS;
877 speed = translate_speed(inspeed);
879 cfsetospeed (&tios, speed);
880 cfsetispeed (&tios, speed);
883 * We can't proceed if the serial port speed is B0,
884 * since that implies that the serial port is disabled.
887 speed = cfgetospeed(&tios);
889 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
892 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
893 if (!ok_error(errno))
894 fatal("tcsetattr: %m (line %d)", __LINE__);
896 baud_rate = baud_rate_of(speed);
900 /********************************************************************
902 * setdtr - control the DTR line on the serial port.
903 * This is called from die(), so it shouldn't call die().
906 void setdtr (int tty_fd, int on)
908 int modembits = TIOCM_DTR;
910 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
913 /********************************************************************
915 * restore_tty - restore the terminal to the saved settings.
918 void restore_tty (int tty_fd)
923 * Turn off echoing, because otherwise we can get into
924 * a loop with the tty and the modem echoing to each other.
925 * We presume we are the sole user of this tty device, so
926 * when we close it, it will revert to its defaults anyway.
929 inittermios.c_lflag &= ~(ECHO | ECHONL);
931 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
932 if (! ok_error (errno))
933 warn("tcsetattr: %m (line %d)", __LINE__);
938 /********************************************************************
940 * output - Output PPP packet.
943 void output (int unit, unsigned char *p, int len)
948 dump_packet("sent", p, len);
950 if (len < PPP_HDRLEN)
952 if (new_style_driver) {
955 proto = (p[0] << 8) + p[1];
956 if (ifunit >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
959 if (write(fd, p, len) < 0) {
960 if (errno == EWOULDBLOCK || errno == ENOBUFS
961 || errno == ENXIO || errno == EIO || errno == EINTR)
962 warn("write: warning: %m (%d)", errno);
964 error("write: %m (%d)", errno);
968 /********************************************************************
970 * wait_input - wait until there is data available,
971 * for the length of time specified by *timo (indefinite
975 void wait_input(struct timeval *timo)
982 n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
983 if (n < 0 && errno != EINTR)
988 * add_fd - add an fd to the set that wait_input waits for.
998 * remove_fd - remove an fd from the set that wait_input waits for.
1000 void remove_fd(int fd)
1002 FD_CLR(fd, &in_fds);
1006 /********************************************************************
1008 * read_packet - get a PPP packet from the serial device.
1011 int read_packet (unsigned char *buf)
1015 len = PPP_MRU + PPP_HDRLEN;
1016 if (new_style_driver) {
1017 *buf++ = PPP_ALLSTATIONS;
1023 nr = read(ppp_fd, buf, len);
1024 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
1026 if (nr < 0 && errno == ENXIO)
1029 if (nr < 0 && new_style_driver && ifunit >= 0) {
1030 /* N.B. we read ppp_fd first since LCP packets come in there. */
1031 nr = read(ppp_dev_fd, buf, len);
1032 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
1033 error("read /dev/ppp: %m");
1034 if (nr < 0 && errno == ENXIO)
1037 return (new_style_driver && nr > 0)? nr+2: nr;
1040 /********************************************************************
1042 * get_loop_output - get outgoing packets from the ppp device,
1043 * and detect when we want to bring the real link up.
1044 * Return value is 1 if we need to bring up the link, 0 otherwise.
1047 get_loop_output(void)
1052 if (new_style_driver) {
1053 while ((n = read_packet(inpacket_buf)) > 0)
1054 if (loop_frame(inpacket_buf, n))
1059 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
1060 if (loop_chars(inbuf, n))
1064 fatal("eof on loopback");
1066 if (errno != EWOULDBLOCK)
1067 fatal("read from loopback: %m(%d)", errno);
1073 * netif_set_mtu - set the MTU on the PPP network interface.
1076 netif_set_mtu(int unit, int mtu)
1080 SYSDEBUG ((LOG_DEBUG, "netif_set_mtu: mtu = %d\n", mtu));
1082 memset (&ifr, '\0', sizeof (ifr));
1083 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1086 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
1087 error("ioctl(SIOCSIFMTU): %m (line %d)", __LINE__);
1090 /********************************************************************
1092 * tty_send_config - configure the transmit characteristics of
1093 * the ppp interface.
1096 void tty_send_config (int mtu,u_int32_t asyncmap,int pcomp,int accomp)
1101 * Set the asyncmap and other parameters for the ppp device
1106 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
1107 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
1108 if (!ok_error(errno))
1109 fatal("ioctl(PPPIOCSASYNCMAP): %m (line %d)", __LINE__);
1113 x = get_flags(ppp_fd);
1114 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
1115 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
1116 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
1117 set_flags(ppp_fd, x);
1120 /********************************************************************
1122 * tty_set_xaccm - set the extended transmit ACCM for the interface.
1125 void tty_set_xaccm (ext_accm accm)
1127 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
1128 accm[0], accm[1], accm[2], accm[3]));
1132 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
1133 if ( ! ok_error (errno))
1134 warn("ioctl(set extended ACCM): %m (line %d)", __LINE__);
1138 /********************************************************************
1140 * tty_recv_config - configure the receive-side characteristics of
1141 * the ppp interface.
1144 void tty_recv_config (int mru,u_int32_t asyncmap,int pcomp,int accomp)
1146 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
1148 * If we were called because the link has gone down then there is nothing
1149 * which may be done. Just return without incident.
1154 * Set the receiver parameters
1156 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
1157 if ( ! ok_error (errno))
1158 error("ioctl(PPPIOCSMRU): %m (line %d)", __LINE__);
1160 if (new_style_driver && ifunit >= 0
1161 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1162 error("Couldn't set MRU in generic PPP layer: %m");
1164 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
1165 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
1166 if (!ok_error(errno))
1167 error("ioctl(PPPIOCSRASYNCMAP): %m (line %d)", __LINE__);
1171 /********************************************************************
1173 * ccp_test - ask kernel whether a given compression method
1174 * is acceptable for use.
1177 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1179 struct ppp_option_data data;
1181 memset (&data, '\0', sizeof (data));
1183 data.length = opt_len;
1184 data.transmit = for_transmit;
1186 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1189 return (errno == ENOBUFS)? 0: -1;
1192 /********************************************************************
1194 * ccp_flags_set - inform kernel about the current state of CCP.
1197 void ccp_flags_set (int unit, int isopen, int isup)
1199 if (still_ppp() && ifunit >= 0) {
1200 int x = get_flags(ppp_dev_fd);
1201 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
1202 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
1203 set_flags (ppp_dev_fd, x);
1209 * set_filters - set the active and pass filters in the kernel driver.
1211 int set_filters(struct bpf_program *pass, struct bpf_program *active)
1213 struct sock_fprog fp;
1215 fp.len = pass->bf_len;
1216 fp.filter = (struct sock_filter *) pass->bf_insns;
1217 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) {
1218 if (errno == ENOTTY)
1219 warn("kernel does not support PPP filtering");
1221 error("Couldn't set pass-filter in kernel: %m");
1224 fp.len = active->bf_len;
1225 fp.filter = (struct sock_filter *) active->bf_insns;
1226 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) {
1227 error("Couldn't set active-filter in kernel: %m");
1232 #endif /* PPP_FILTER */
1234 /********************************************************************
1236 * get_idle_time - return how long the link has been idle.
1239 get_idle_time(u, ip)
1241 struct ppp_idle *ip;
1243 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
1246 /********************************************************************
1248 * get_ppp_stats - return statistics for the link.
1251 get_ppp_stats(u, stats)
1253 struct pppd_stats *stats;
1255 struct ifpppstatsreq req;
1257 memset (&req, 0, sizeof (req));
1259 req.stats_ptr = (caddr_t) &req.stats;
1260 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
1261 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
1262 error("Couldn't get PPP statistics: %m");
1265 stats->bytes_in = req.stats.p.ppp_ibytes;
1266 stats->bytes_out = req.stats.p.ppp_obytes;
1267 stats->pkts_in = req.stats.p.ppp_ipackets;
1268 stats->pkts_out = req.stats.p.ppp_opackets;
1272 /********************************************************************
1274 * ccp_fatal_error - returns 1 if decompression was disabled as a
1275 * result of an error detected after decompression of a packet,
1276 * 0 otherwise. This is necessary because of patent nonsense.
1279 int ccp_fatal_error (int unit)
1281 int x = get_flags(ppp_dev_fd);
1283 return x & SC_DC_FERROR;
1286 /********************************************************************
1288 * path_to_procfs - find the path to the proc file system mount point
1290 static char proc_path[MAXPATHLEN];
1291 static int proc_path_len;
1293 static char *path_to_procfs(const char *tail)
1295 struct mntent *mntent;
1298 if (proc_path_len == 0) {
1299 /* Default the mount location of /proc */
1300 strlcpy (proc_path, "/proc", sizeof(proc_path));
1302 fp = fopen(MOUNTED, "r");
1304 while ((mntent = getmntent(fp)) != NULL) {
1305 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1307 if (strcmp(mntent->mnt_type, "proc") == 0) {
1308 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path));
1309 proc_path_len = strlen(proc_path);
1317 strlcpy(proc_path + proc_path_len, tail,
1318 sizeof(proc_path) - proc_path_len);
1323 * /proc/net/route parsing stuff.
1325 #define ROUTE_MAX_COLS 12
1326 FILE *route_fd = (FILE *) 0;
1327 static char route_buffer[512];
1328 static int route_dev_col, route_dest_col, route_gw_col;
1329 static int route_flags_col, route_mask_col;
1330 static int route_num_cols;
1332 static int open_route_table (void);
1333 static void close_route_table (void);
1334 static int read_route_table (struct rtentry *rt);
1336 /********************************************************************
1338 * close_route_table - close the interface to the route table
1341 static void close_route_table (void)
1343 if (route_fd != (FILE *) 0) {
1345 route_fd = (FILE *) 0;
1349 /********************************************************************
1351 * open_route_table - open the interface to the route table
1353 static char route_delims[] = " \t\n";
1355 static int open_route_table (void)
1359 close_route_table();
1361 path = path_to_procfs("/net/route");
1362 route_fd = fopen (path, "r");
1363 if (route_fd == NULL) {
1364 error("can't open routing table %s: %m", path);
1368 route_dev_col = 0; /* default to usual columns */
1371 route_flags_col = 3;
1375 /* parse header line */
1376 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1377 char *p = route_buffer, *q;
1379 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1381 if ((q = strtok(p, route_delims)) == 0)
1383 if (strcasecmp(q, "iface") == 0)
1384 route_dev_col = col;
1385 else if (strcasecmp(q, "destination") == 0)
1386 route_dest_col = col;
1387 else if (strcasecmp(q, "gateway") == 0)
1389 else if (strcasecmp(q, "flags") == 0)
1390 route_flags_col = col;
1391 else if (strcasecmp(q, "mask") == 0)
1392 route_mask_col = col;
1395 if (used && col >= route_num_cols)
1396 route_num_cols = col + 1;
1404 /********************************************************************
1406 * read_route_table - read the next entry from the route table
1409 static int read_route_table(struct rtentry *rt)
1411 char *cols[ROUTE_MAX_COLS], *p;
1414 memset (rt, '\0', sizeof (struct rtentry));
1416 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1420 for (col = 0; col < route_num_cols; ++col) {
1421 cols[col] = strtok(p, route_delims);
1422 if (cols[col] == NULL)
1423 return 0; /* didn't get enough columns */
1427 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
1428 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
1429 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
1431 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1432 rt->rt_dev = cols[route_dev_col];
1437 /********************************************************************
1439 * defaultroute_exists - determine if there is a default route
1442 static int defaultroute_exists (struct rtentry *rt)
1446 if (!open_route_table())
1449 while (read_route_table(rt) != 0) {
1450 if ((rt->rt_flags & RTF_UP) == 0)
1453 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
1455 if (SIN_ADDR(rt->rt_dst) == 0L) {
1461 close_route_table();
1466 * have_route_to - determine if the system has any route to
1467 * a given IP address. `addr' is in network byte order.
1468 * Return value is 1 if yes, 0 if no, -1 if don't know.
1469 * For demand mode to work properly, we have to ignore routes
1470 * through our own interface.
1472 int have_route_to(u_int32_t addr)
1477 if (!open_route_table())
1478 return -1; /* don't know */
1480 while (read_route_table(&rt)) {
1481 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1483 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) {
1489 close_route_table();
1493 /********************************************************************
1495 * sifdefaultroute - assign a default route through the address given.
1498 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1502 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1503 u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway);
1505 if (old_gateway != gateway)
1506 error("not replacing existing default route to %s [%I]",
1507 rt.rt_dev, old_gateway);
1511 memset (&rt, '\0', sizeof (rt));
1512 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1513 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1515 if (kernel_version > KVERSION(2,1,0)) {
1516 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1517 SIN_ADDR(rt.rt_genmask) = 0L;
1520 SIN_ADDR(rt.rt_gateway) = gateway;
1522 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1523 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1524 if ( ! ok_error ( errno ))
1525 error("default route ioctl(SIOCADDRT): %m");
1529 default_route_gateway = gateway;
1533 /********************************************************************
1535 * cifdefaultroute - delete a default route through the address given.
1538 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1542 default_route_gateway = 0;
1544 memset (&rt, '\0', sizeof (rt));
1545 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1546 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1548 if (kernel_version > KVERSION(2,1,0)) {
1549 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1550 SIN_ADDR(rt.rt_genmask) = 0L;
1553 SIN_ADDR(rt.rt_gateway) = gateway;
1555 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1556 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1558 if ( ! ok_error ( errno ))
1559 error("default route ioctl(SIOCDELRT): %m");
1567 /********************************************************************
1569 * sifproxyarp - Make a proxy ARP entry for the peer.
1572 int sifproxyarp (int unit, u_int32_t his_adr)
1574 struct arpreq arpreq;
1577 if (has_proxy_arp == 0) {
1578 memset (&arpreq, '\0', sizeof(arpreq));
1580 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1581 SIN_ADDR(arpreq.arp_pa) = his_adr;
1582 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1584 * Get the hardware address of an interface on the same subnet
1585 * as our local address.
1587 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1588 sizeof(proxy_arp_dev))) {
1589 error("Cannot determine ethernet address for proxy ARP");
1592 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1594 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1595 if ( ! ok_error ( errno ))
1596 error("ioctl(SIOCSARP): %m");
1599 proxy_arp_addr = his_adr;
1603 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward");
1604 if (forw_path != 0) {
1605 int fd = open(forw_path, O_WRONLY);
1607 if (write(fd, "1", 1) != 1)
1608 error("Couldn't enable IP forwarding: %m");
1618 /********************************************************************
1620 * cifproxyarp - Delete the proxy ARP entry for the peer.
1623 int cifproxyarp (int unit, u_int32_t his_adr)
1625 struct arpreq arpreq;
1627 if (has_proxy_arp) {
1629 memset (&arpreq, '\0', sizeof(arpreq));
1630 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1631 SIN_ADDR(arpreq.arp_pa) = his_adr;
1632 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1633 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1635 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1636 if ( ! ok_error ( errno ))
1637 warn("ioctl(SIOCDARP): %m");
1644 /********************************************************************
1646 * get_ether_addr - get the hardware address of an interface on the
1647 * the same subnet as ipaddr.
1650 static int get_ether_addr (u_int32_t ipaddr,
1651 struct sockaddr *hwaddr,
1652 char *name, int namelen)
1654 struct ifreq *ifr, *ifend;
1655 u_int32_t ina, mask;
1659 struct ifreq ifs[MAX_IFS];
1661 ifc.ifc_len = sizeof(ifs);
1663 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1664 if ( ! ok_error ( errno ))
1665 error("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1669 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1670 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1672 * Scan through looking for an interface with an Internet
1673 * address on the same subnet as `ipaddr'.
1675 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1676 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1677 if (ifr->ifr_addr.sa_family == AF_INET) {
1678 ina = SIN_ADDR(ifr->ifr_addr);
1679 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1680 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1683 * Check that the interface is up, and not point-to-point
1686 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1689 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1692 * Get its netmask and check that it's on the right subnet.
1694 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1697 mask = SIN_ADDR(ifreq.ifr_addr);
1698 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1699 ip_ntoa(ina), ntohl(mask)));
1701 if (((ipaddr ^ ina) & mask) != 0)
1710 strlcpy(name, ifreq.ifr_name, namelen);
1712 /* trim off the :1 in eth0:1 */
1713 aliasp = strchr(name, ':');
1717 info("found interface %s for proxy arp", name);
1719 * Now get the hardware address.
1721 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1722 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) {
1723 error("SIOCGIFHWADDR(%s): %m", ifreq.ifr_name);
1729 sizeof (struct sockaddr));
1731 SYSDEBUG ((LOG_DEBUG,
1732 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1733 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1734 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1735 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1736 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1737 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1738 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1739 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1740 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1745 * get_if_hwaddr - get the hardware address for the specified
1746 * network interface device.
1749 get_if_hwaddr(u_char *addr, char *name)
1754 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
1757 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
1758 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
1759 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
1762 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
1767 * get_first_ethernet - return the name of the first ethernet-style
1768 * interface on this system.
1771 get_first_ethernet()
1776 /********************************************************************
1778 * Return user specified netmask, modified by any mask we might determine
1779 * for address `addr' (in network byte order).
1780 * Here we scan through the system's list of interfaces, looking for
1781 * any non-point-to-point interfaces which might appear to be on the same
1782 * network as `addr'. If we find any, we OR in their netmask to the
1783 * user-specified netmask.
1786 u_int32_t GetMask (u_int32_t addr)
1788 u_int32_t mask, nmask, ina;
1789 struct ifreq *ifr, *ifend, ifreq;
1791 struct ifreq ifs[MAX_IFS];
1795 if (IN_CLASSA(addr)) /* determine network mask for address class */
1796 nmask = IN_CLASSA_NET;
1797 else if (IN_CLASSB(addr))
1798 nmask = IN_CLASSB_NET;
1800 nmask = IN_CLASSC_NET;
1802 /* class D nets are disallowed by bad_ip_adrs */
1803 mask = netmask | htonl(nmask);
1805 * Scan through the system's network interfaces.
1807 ifc.ifc_len = sizeof(ifs);
1809 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1810 if ( ! ok_error ( errno ))
1811 warn("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1815 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1816 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1818 * Check the interface's internet address.
1820 if (ifr->ifr_addr.sa_family != AF_INET)
1822 ina = SIN_ADDR(ifr->ifr_addr);
1823 if (((ntohl(ina) ^ addr) & nmask) != 0)
1826 * Check that the interface is up, and not point-to-point nor loopback.
1828 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1829 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1832 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1835 * Get its netmask and OR it into our mask.
1837 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1839 mask |= SIN_ADDR(ifreq.ifr_addr);
1845 /********************************************************************
1847 * Internal routine to decode the version.modification.patch level
1850 static void decode_version (char *buf, int *version,
1851 int *modification, int *patch)
1855 *version = (int) strtoul (buf, &endp, 10);
1859 if (endp != buf && *endp == '.') {
1861 *modification = (int) strtoul (buf, &endp, 10);
1862 if (endp != buf && *endp == '.') {
1864 *patch = (int) strtoul (buf, &buf, 10);
1869 /********************************************************************
1871 * Procedure to determine if the PPP line discipline is registered.
1875 ppp_registered(void)
1883 * We used to open the serial device and set it to the ppp line
1884 * discipline here, in order to create a ppp unit. But that is
1885 * not a good idea - the user might have specified a device that
1886 * they can't open (permission, or maybe it doesn't really exist).
1887 * So we grab a pty master/slave pair and use that.
1889 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1890 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1895 * Try to put the device into the PPP discipline.
1897 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1898 error("ioctl(TIOCSETD(PPP)): %m (line %d)", __LINE__);
1907 /********************************************************************
1909 * ppp_available - check whether the system has any ppp interfaces
1910 * (in fact we check whether we can do an ioctl on ppp0).
1913 int ppp_available(void)
1918 int my_version, my_modification, my_patch;
1919 int osmaj, osmin, ospatch;
1922 "This system lacks kernel support for PPP. This could be because\n"
1923 "the PPP kernel module could not be loaded, or because PPP was not\n"
1924 "included in the kernel configuration. If PPP was included as a\n"
1925 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
1926 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
1927 "See README.linux file in the ppp distribution for more details.\n";
1929 /* get the kernel version now, since we are called before sys_init */
1931 osmaj = osmin = ospatch = 0;
1932 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
1933 kernel_version = KVERSION(osmaj, osmin, ospatch);
1935 fd = open("/dev/ppp", O_RDWR);
1937 if (fd < 0 && errno == ENOENT) {
1938 /* try making it and see if that helps. */
1939 if (mknod("/dev/ppp", S_IFCHR | S_IRUSR | S_IWUSR,
1940 makedev(108, 0)) >= 0) {
1941 fd = open("/dev/ppp", O_RDWR);
1943 info("Created /dev/ppp device node");
1945 unlink("/dev/ppp"); /* didn't work, undo the mknod */
1946 } else if (errno == EEXIST) {
1947 fd = open("/dev/ppp", O_RDWR);
1952 new_style_driver = 1;
1954 /* XXX should get from driver */
1956 driver_modification = 4;
1961 if (kernel_version >= KVERSION(2,3,13)) {
1962 if (errno == ENOENT)
1964 "pppd is unable to open the /dev/ppp device.\n"
1965 "You need to create the /dev/ppp device node by\n"
1966 "executing the following command as root:\n"
1967 " mknod /dev/ppp c 108 0\n";
1972 * Open a socket for doing the ioctl operations.
1974 s = socket(AF_INET, SOCK_DGRAM, 0);
1978 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1979 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1981 * If the device did not exist then attempt to create one by putting the
1982 * current tty into the PPP discipline. If this works then obtain the
1983 * flags for the device again.
1986 if (ppp_registered()) {
1987 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1988 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1992 * Ensure that the hardware address is for PPP and not something else
1995 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1997 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
2001 * This is the PPP device. Validate the version of the driver at this
2002 * point to ensure that this program will work with the driver.
2005 char abBuffer [1024];
2007 ifr.ifr_data = abBuffer;
2008 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
2010 error("Couldn't read driver version: %m");
2012 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
2015 decode_version(abBuffer,
2017 &driver_modification,
2020 * Validate the version of the driver against the version that we used.
2022 decode_version(VERSION,
2027 /* The version numbers must match */
2028 if (driver_version != my_version)
2031 /* The modification levels must be legal */
2032 if (driver_modification < 3) {
2033 if (driver_modification >= 2) {
2034 /* we can cope with 2.2.0 and above */
2043 slprintf(route_buffer, sizeof(route_buffer),
2044 "Sorry - PPP driver version %d.%d.%d is out of date\n",
2045 driver_version, driver_modification, driver_patch);
2047 no_ppp_msg = route_buffer;
2054 /********************************************************************
2056 * Update the wtmp file with the appropriate user name and tty device.
2059 void logwtmp (const char *line, const char *name, const char *host)
2061 struct utmp ut, *utp;
2062 pid_t mypid = getpid();
2068 * Update the signon database for users.
2069 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
2071 utmpname(_PATH_UTMP);
2073 while ((utp = getutent()) && (utp->ut_pid != mypid))
2077 memcpy(&ut, utp, sizeof(ut));
2079 /* some gettys/telnetds don't initialize utmp... */
2080 memset(&ut, 0, sizeof(ut));
2082 if (ut.ut_id[0] == 0)
2083 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
2085 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
2086 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
2090 ut.ut_type = USER_PROCESS;
2093 /* Insert the host name if one is supplied */
2095 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
2097 /* Insert the IP address of the remote system if IP is enabled */
2098 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
2099 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
2100 sizeof(ut.ut_addr));
2102 /* CL: Makes sure that the logout works */
2103 if (*host == 0 && *name==0)
2109 * Update the wtmp file.
2112 updwtmp(_PATH_WTMP, &ut);
2114 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
2116 flock(wtmp, LOCK_EX);
2118 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut))
2119 warn("error writing %s: %m", _PATH_WTMP);
2121 flock(wtmp, LOCK_UN);
2129 /********************************************************************
2131 * sifvjcomp - config tcp header compression
2134 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2136 u_int x = get_flags(ppp_dev_fd);
2139 if (ioctl (ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
2140 if (! ok_error (errno))
2141 error("ioctl(PPPIOCSMAXCID): %m (line %d)", __LINE__);
2146 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
2147 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
2148 set_flags (ppp_dev_fd, x);
2153 /********************************************************************
2155 * sifup - Config the interface up and enable IP packets to pass.
2162 memset (&ifr, '\0', sizeof (ifr));
2163 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2164 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2165 if (! ok_error (errno))
2166 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2170 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2171 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2172 if (! ok_error (errno))
2173 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2181 /********************************************************************
2183 * sifdown - Disable the indicated protocol and config the interface
2184 * down if there are no remaining protocols.
2191 if (if_is_up && --if_is_up > 0)
2194 memset (&ifr, '\0', sizeof (ifr));
2195 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2196 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2197 if (! ok_error (errno))
2198 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2202 ifr.ifr_flags &= ~IFF_UP;
2203 ifr.ifr_flags |= IFF_POINTOPOINT;
2204 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2205 if (! ok_error (errno))
2206 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2212 /********************************************************************
2214 * sifaddr - Config the interface IP addresses and netmask.
2217 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2223 memset (&ifr, '\0', sizeof (ifr));
2224 memset (&rt, '\0', sizeof (rt));
2226 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2227 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2228 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2230 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2232 * Set our IP address
2234 SIN_ADDR(ifr.ifr_addr) = our_adr;
2235 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2236 if (errno != EEXIST) {
2237 if (! ok_error (errno))
2238 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2241 warn("ioctl(SIOCSIFADDR): Address already exists");
2246 * Set the gateway address
2248 SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
2249 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2250 if (! ok_error (errno))
2251 error("ioctl(SIOCSIFDSTADDR): %m (line %d)", __LINE__);
2256 * For recent kernels, force the netmask to 255.255.255.255.
2258 if (kernel_version >= KVERSION(2,1,16))
2260 if (net_mask != 0) {
2261 SIN_ADDR(ifr.ifr_netmask) = net_mask;
2262 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2263 if (! ok_error (errno))
2264 error("ioctl(SIOCSIFNETMASK): %m (line %d)", __LINE__);
2269 * Add the device route
2271 if (kernel_version < KVERSION(2,1,16)) {
2272 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2273 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2276 SIN_ADDR(rt.rt_gateway) = 0L;
2277 SIN_ADDR(rt.rt_dst) = his_adr;
2278 rt.rt_flags = RTF_UP | RTF_HOST;
2280 if (kernel_version > KVERSION(2,1,0)) {
2281 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2282 SIN_ADDR(rt.rt_genmask) = -1L;
2285 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2286 if (! ok_error (errno))
2287 error("ioctl(SIOCADDRT) device route: %m (line %d)", __LINE__);
2292 /* set ip_dynaddr in demand mode if address changes */
2293 if (demand && tune_kernel && !dynaddr_set
2294 && our_old_addr && our_old_addr != our_adr) {
2295 /* set ip_dynaddr if possible */
2299 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
2300 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
2301 if (write(fd, "1", 1) != 1)
2302 error("Couldn't enable dynamic IP addressing: %m");
2305 dynaddr_set = 1; /* only 1 attempt */
2312 /********************************************************************
2314 * cifaddr - Clear the interface IP addresses, and delete routes
2315 * through the interface if possible.
2318 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2322 if (kernel_version < KVERSION(2,1,16)) {
2324 * Delete the route through the device
2327 memset (&rt, '\0', sizeof (rt));
2329 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2330 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2333 SIN_ADDR(rt.rt_gateway) = 0;
2334 SIN_ADDR(rt.rt_dst) = his_adr;
2335 rt.rt_flags = RTF_UP | RTF_HOST;
2337 if (kernel_version > KVERSION(2,1,0)) {
2338 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2339 SIN_ADDR(rt.rt_genmask) = -1L;
2342 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2343 if (still_ppp() && ! ok_error (errno))
2344 error("ioctl(SIOCDELRT) device route: %m (line %d)", __LINE__);
2349 /* This way it is possible to have an IPX-only or IPv6-only interface */
2350 memset(&ifr, 0, sizeof(ifr));
2351 SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
2352 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2354 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2355 if (! ok_error (errno)) {
2356 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2361 our_old_addr = our_adr;
2367 /********************************************************************
2369 * sif6addr - Config the interface with an IPv6 link-local address
2371 int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2373 struct in6_ifreq ifr6;
2375 struct in6_rtmsg rt6;
2379 error("IPv6 socket creation failed: %m");
2382 memset(&ifr, 0, sizeof (ifr));
2383 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2384 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2385 error("sif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2389 /* Local interface */
2390 memset(&ifr6, 0, sizeof(ifr6));
2391 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2392 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2393 ifr6.ifr6_prefixlen = 10;
2395 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
2396 error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2400 /* Route to remote host */
2401 memset(&rt6, 0, sizeof(rt6));
2402 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
2403 rt6.rtmsg_flags = RTF_UP;
2404 rt6.rtmsg_dst_len = 10;
2405 rt6.rtmsg_ifindex = ifr.ifr_ifindex;
2406 rt6.rtmsg_metric = 1;
2408 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
2409 error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
2417 /********************************************************************
2419 * cif6addr - Remove IPv6 address from interface
2421 int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2424 struct in6_ifreq ifr6;
2428 error("IPv6 socket creation failed: %m");
2431 memset(&ifr, 0, sizeof(ifr));
2432 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2433 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2434 error("cif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2438 memset(&ifr6, 0, sizeof(ifr6));
2439 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2440 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2441 ifr6.ifr6_prefixlen = 10;
2443 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
2444 if (errno != EADDRNOTAVAIL) {
2445 if (! ok_error (errno))
2446 error("cif6addr: ioctl(SIOCDIFADDR): %m (line %d)", __LINE__);
2449 warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
2458 * get_pty - get a pty master/slave pair and chown the slave side
2459 * to the uid given. Assumes slave_name points to >= 16 bytes of space.
2462 get_pty(master_fdp, slave_fdp, slave_name, uid)
2468 int i, mfd, sfd = -1;
2470 struct termios tios;
2474 * Try the unix98 way first.
2476 mfd = open("/dev/ptmx", O_RDWR);
2479 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
2480 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
2481 chmod(pty_name, S_IRUSR | S_IWUSR);
2484 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
2485 warn("Couldn't unlock pty slave %s: %m", pty_name);
2487 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0)
2488 warn("Couldn't open pty slave %s: %m", pty_name);
2491 #endif /* TIOCGPTN */
2494 /* the old way - scan through the pty name space */
2495 for (i = 0; i < 64; ++i) {
2496 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2497 'p' + i / 16, i % 16);
2498 mfd = open(pty_name, O_RDWR, 0);
2501 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2503 fchown(sfd, uid, -1);
2504 fchmod(sfd, S_IRUSR | S_IWUSR);
2515 strlcpy(slave_name, pty_name, 16);
2518 if (tcgetattr(sfd, &tios) == 0) {
2519 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2520 tios.c_cflag |= CS8 | CREAD | CLOCAL;
2521 tios.c_iflag = IGNPAR;
2524 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2525 warn("couldn't set attributes on pty: %m");
2527 warn("couldn't get attributes on pty: %m");
2532 /********************************************************************
2534 * open_loopback - open the device we use for getting packets
2535 * in demand mode. Under Linux, we use a pty master/slave pair.
2538 open_ppp_loopback(void)
2543 if (new_style_driver) {
2544 /* allocate ourselves a ppp unit */
2545 if (make_ppp_unit() < 0)
2547 set_flags(ppp_dev_fd, SC_LOOP_TRAFFIC);
2548 set_kdebugflag(kdebugflag);
2553 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2554 fatal("No free pty for loopback");
2555 SYSDEBUG(("using %s for loopback", loop_name));
2557 set_ppp_fd(slave_fd);
2559 flags = fcntl(master_fd, F_GETFL);
2561 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2562 warn("couldn't set master loopback to nonblock: %m");
2564 flags = fcntl(ppp_fd, F_GETFL);
2566 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2567 warn("couldn't set slave loopback to nonblock: %m");
2569 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2570 fatal("ioctl(TIOCSETD): %m (line %d)", __LINE__);
2572 * Find out which interface we were given.
2574 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2575 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
2577 * Enable debug in the driver if requested.
2579 set_kdebugflag (kdebugflag);
2584 /********************************************************************
2586 * sifnpmode - Set the mode for handling packets for a given NP.
2590 sifnpmode(u, proto, mode)
2597 npi.protocol = proto;
2599 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2600 if (! ok_error (errno))
2601 error("ioctl(PPPIOCSNPMODE, %d, %d): %m", proto, mode);
2608 /********************************************************************
2610 * sipxfaddr - Config the interface IPX networknumber
2613 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2620 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2622 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2624 if (! ok_error (errno))
2625 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2629 memset (&ifr, '\0', sizeof (ifr));
2630 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2632 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2633 sipx->sipx_family = AF_IPX;
2634 sipx->sipx_port = 0;
2635 sipx->sipx_network = htonl (network);
2636 sipx->sipx_type = IPX_FRAME_ETHERII;
2637 sipx->sipx_action = IPX_CRTITF;
2639 * Set the IPX device
2641 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2643 if (errno != EEXIST) {
2644 if (! ok_error (errno))
2645 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (line %d)", __LINE__);
2648 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2657 /********************************************************************
2659 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2660 * are removed and the device is no longer able to pass IPX
2664 int cipxfaddr (int unit)
2671 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2673 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2675 if (! ok_error (errno))
2676 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2680 memset (&ifr, '\0', sizeof (ifr));
2681 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2683 sipx->sipx_type = IPX_FRAME_ETHERII;
2684 sipx->sipx_action = IPX_DLTITF;
2685 sipx->sipx_family = AF_IPX;
2687 * Set the IPX device
2689 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2690 if (! ok_error (errno))
2691 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (line %d)", __LINE__);
2701 * Use the hostname as part of the random number seed.
2710 for (p = hostname; *p != 0; ++p)
2715 /********************************************************************
2717 * sys_check_options - check the options that the user specified
2721 sys_check_options(void)
2725 * Disable the IPX protocol if the support is not present in the kernel.
2729 if (ipxcp_protent.enabled_flag) {
2730 struct stat stat_buf;
2731 if ((path = path_to_procfs("/net/ipx_interface")) == 0
2732 || lstat(path, &stat_buf) < 0) {
2733 error("IPX support is not present in the kernel\n");
2734 ipxcp_protent.enabled_flag = 0;
2738 if (demand && driver_is_old) {
2739 option_error("demand dialling is not supported by kernel driver "
2740 "version %d.%d.%d", driver_version, driver_modification,
2744 if (multilink && !new_style_driver) {
2745 warn("Warning: multilink is not supported by the kernel driver");