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)
949 dbglog("sent %P", p, len);
951 if (len < PPP_HDRLEN)
953 if (new_style_driver) {
956 proto = (p[0] << 8) + p[1];
957 if (ifunit >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
960 if (write(fd, p, len) < 0) {
961 if (errno == EWOULDBLOCK || errno == ENOBUFS
962 || errno == ENXIO || errno == EIO || errno == EINTR)
963 warn("write: warning: %m (%d)", errno);
965 error("write: %m (%d)", errno);
969 /********************************************************************
971 * wait_input - wait until there is data available,
972 * for the length of time specified by *timo (indefinite
976 void wait_input(struct timeval *timo)
983 n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
984 if (n < 0 && errno != EINTR)
989 * add_fd - add an fd to the set that wait_input waits for.
999 * remove_fd - remove an fd from the set that wait_input waits for.
1001 void remove_fd(int fd)
1003 FD_CLR(fd, &in_fds);
1007 /********************************************************************
1009 * read_packet - get a PPP packet from the serial device.
1012 int read_packet (unsigned char *buf)
1016 len = PPP_MRU + PPP_HDRLEN;
1017 if (new_style_driver) {
1018 *buf++ = PPP_ALLSTATIONS;
1024 nr = read(ppp_fd, buf, len);
1025 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
1027 if (nr < 0 && errno == ENXIO)
1030 if (nr < 0 && new_style_driver && ifunit >= 0) {
1031 /* N.B. we read ppp_fd first since LCP packets come in there. */
1032 nr = read(ppp_dev_fd, buf, len);
1033 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
1034 error("read /dev/ppp: %m");
1035 if (nr < 0 && errno == ENXIO)
1038 return (new_style_driver && nr > 0)? nr+2: nr;
1041 /********************************************************************
1043 * get_loop_output - get outgoing packets from the ppp device,
1044 * and detect when we want to bring the real link up.
1045 * Return value is 1 if we need to bring up the link, 0 otherwise.
1048 get_loop_output(void)
1053 if (new_style_driver) {
1054 while ((n = read_packet(inpacket_buf)) > 0)
1055 if (loop_frame(inpacket_buf, n))
1060 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
1061 if (loop_chars(inbuf, n))
1065 fatal("eof on loopback");
1067 if (errno != EWOULDBLOCK)
1068 fatal("read from loopback: %m(%d)", errno);
1074 * netif_set_mtu - set the MTU on the PPP network interface.
1077 netif_set_mtu(int unit, int mtu)
1081 SYSDEBUG ((LOG_DEBUG, "netif_set_mtu: mtu = %d\n", mtu));
1083 memset (&ifr, '\0', sizeof (ifr));
1084 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1087 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
1088 error("ioctl(SIOCSIFMTU): %m (line %d)", __LINE__);
1091 /********************************************************************
1093 * tty_send_config - configure the transmit characteristics of
1094 * the ppp interface.
1097 void tty_send_config (int mtu,u_int32_t asyncmap,int pcomp,int accomp)
1102 * Set the asyncmap and other parameters for the ppp device
1107 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
1108 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
1109 if (!ok_error(errno))
1110 fatal("ioctl(PPPIOCSASYNCMAP): %m (line %d)", __LINE__);
1114 x = get_flags(ppp_fd);
1115 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
1116 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
1117 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
1118 set_flags(ppp_fd, x);
1121 /********************************************************************
1123 * tty_set_xaccm - set the extended transmit ACCM for the interface.
1126 void tty_set_xaccm (ext_accm accm)
1128 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
1129 accm[0], accm[1], accm[2], accm[3]));
1133 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
1134 if ( ! ok_error (errno))
1135 warn("ioctl(set extended ACCM): %m (line %d)", __LINE__);
1139 /********************************************************************
1141 * tty_recv_config - configure the receive-side characteristics of
1142 * the ppp interface.
1145 void tty_recv_config (int mru,u_int32_t asyncmap,int pcomp,int accomp)
1147 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
1149 * If we were called because the link has gone down then there is nothing
1150 * which may be done. Just return without incident.
1155 * Set the receiver parameters
1157 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
1158 if ( ! ok_error (errno))
1159 error("ioctl(PPPIOCSMRU): %m (line %d)", __LINE__);
1161 if (new_style_driver && ifunit >= 0
1162 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1163 error("Couldn't set MRU in generic PPP layer: %m");
1165 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
1166 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
1167 if (!ok_error(errno))
1168 error("ioctl(PPPIOCSRASYNCMAP): %m (line %d)", __LINE__);
1172 /********************************************************************
1174 * ccp_test - ask kernel whether a given compression method
1175 * is acceptable for use.
1178 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1180 struct ppp_option_data data;
1182 memset (&data, '\0', sizeof (data));
1184 data.length = opt_len;
1185 data.transmit = for_transmit;
1187 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1190 return (errno == ENOBUFS)? 0: -1;
1193 /********************************************************************
1195 * ccp_flags_set - inform kernel about the current state of CCP.
1198 void ccp_flags_set (int unit, int isopen, int isup)
1200 if (still_ppp() && ifunit >= 0) {
1201 int x = get_flags(ppp_dev_fd);
1202 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
1203 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
1204 set_flags (ppp_dev_fd, x);
1210 * set_filters - set the active and pass filters in the kernel driver.
1212 int set_filters(struct bpf_program *pass, struct bpf_program *active)
1214 struct sock_fprog fp;
1216 fp.len = pass->bf_len;
1217 fp.filter = (struct sock_filter *) pass->bf_insns;
1218 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) {
1219 if (errno == ENOTTY)
1220 warn("kernel does not support PPP filtering");
1222 error("Couldn't set pass-filter in kernel: %m");
1225 fp.len = active->bf_len;
1226 fp.filter = (struct sock_filter *) active->bf_insns;
1227 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) {
1228 error("Couldn't set active-filter in kernel: %m");
1233 #endif /* PPP_FILTER */
1235 /********************************************************************
1237 * get_idle_time - return how long the link has been idle.
1240 get_idle_time(u, ip)
1242 struct ppp_idle *ip;
1244 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
1247 /********************************************************************
1249 * get_ppp_stats - return statistics for the link.
1252 get_ppp_stats(u, stats)
1254 struct pppd_stats *stats;
1256 struct ifpppstatsreq req;
1258 memset (&req, 0, sizeof (req));
1260 req.stats_ptr = (caddr_t) &req.stats;
1261 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
1262 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
1263 error("Couldn't get PPP statistics: %m");
1266 stats->bytes_in = req.stats.p.ppp_ibytes;
1267 stats->bytes_out = req.stats.p.ppp_obytes;
1268 stats->pkts_in = req.stats.p.ppp_ipackets;
1269 stats->pkts_out = req.stats.p.ppp_opackets;
1273 /********************************************************************
1275 * ccp_fatal_error - returns 1 if decompression was disabled as a
1276 * result of an error detected after decompression of a packet,
1277 * 0 otherwise. This is necessary because of patent nonsense.
1280 int ccp_fatal_error (int unit)
1282 int x = get_flags(ppp_dev_fd);
1284 return x & SC_DC_FERROR;
1287 /********************************************************************
1289 * path_to_procfs - find the path to the proc file system mount point
1291 static char proc_path[MAXPATHLEN];
1292 static int proc_path_len;
1294 static char *path_to_procfs(const char *tail)
1296 struct mntent *mntent;
1299 if (proc_path_len == 0) {
1300 /* Default the mount location of /proc */
1301 strlcpy (proc_path, "/proc", sizeof(proc_path));
1303 fp = fopen(MOUNTED, "r");
1305 while ((mntent = getmntent(fp)) != NULL) {
1306 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1308 if (strcmp(mntent->mnt_type, "proc") == 0) {
1309 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path));
1310 proc_path_len = strlen(proc_path);
1318 strlcpy(proc_path + proc_path_len, tail,
1319 sizeof(proc_path) - proc_path_len);
1324 * /proc/net/route parsing stuff.
1326 #define ROUTE_MAX_COLS 12
1327 FILE *route_fd = (FILE *) 0;
1328 static char route_buffer[512];
1329 static int route_dev_col, route_dest_col, route_gw_col;
1330 static int route_flags_col, route_mask_col;
1331 static int route_num_cols;
1333 static int open_route_table (void);
1334 static void close_route_table (void);
1335 static int read_route_table (struct rtentry *rt);
1337 /********************************************************************
1339 * close_route_table - close the interface to the route table
1342 static void close_route_table (void)
1344 if (route_fd != (FILE *) 0) {
1346 route_fd = (FILE *) 0;
1350 /********************************************************************
1352 * open_route_table - open the interface to the route table
1354 static char route_delims[] = " \t\n";
1356 static int open_route_table (void)
1360 close_route_table();
1362 path = path_to_procfs("/net/route");
1363 route_fd = fopen (path, "r");
1364 if (route_fd == NULL) {
1365 error("can't open routing table %s: %m", path);
1369 route_dev_col = 0; /* default to usual columns */
1372 route_flags_col = 3;
1376 /* parse header line */
1377 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1378 char *p = route_buffer, *q;
1380 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1382 if ((q = strtok(p, route_delims)) == 0)
1384 if (strcasecmp(q, "iface") == 0)
1385 route_dev_col = col;
1386 else if (strcasecmp(q, "destination") == 0)
1387 route_dest_col = col;
1388 else if (strcasecmp(q, "gateway") == 0)
1390 else if (strcasecmp(q, "flags") == 0)
1391 route_flags_col = col;
1392 else if (strcasecmp(q, "mask") == 0)
1393 route_mask_col = col;
1396 if (used && col >= route_num_cols)
1397 route_num_cols = col + 1;
1405 /********************************************************************
1407 * read_route_table - read the next entry from the route table
1410 static int read_route_table(struct rtentry *rt)
1412 char *cols[ROUTE_MAX_COLS], *p;
1415 memset (rt, '\0', sizeof (struct rtentry));
1417 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1421 for (col = 0; col < route_num_cols; ++col) {
1422 cols[col] = strtok(p, route_delims);
1423 if (cols[col] == NULL)
1424 return 0; /* didn't get enough columns */
1428 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
1429 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
1430 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
1432 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1433 rt->rt_dev = cols[route_dev_col];
1438 /********************************************************************
1440 * defaultroute_exists - determine if there is a default route
1443 static int defaultroute_exists (struct rtentry *rt)
1447 if (!open_route_table())
1450 while (read_route_table(rt) != 0) {
1451 if ((rt->rt_flags & RTF_UP) == 0)
1454 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
1456 if (SIN_ADDR(rt->rt_dst) == 0L) {
1462 close_route_table();
1467 * have_route_to - determine if the system has any route to
1468 * a given IP address. `addr' is in network byte order.
1469 * Return value is 1 if yes, 0 if no, -1 if don't know.
1470 * For demand mode to work properly, we have to ignore routes
1471 * through our own interface.
1473 int have_route_to(u_int32_t addr)
1478 if (!open_route_table())
1479 return -1; /* don't know */
1481 while (read_route_table(&rt)) {
1482 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1484 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) {
1490 close_route_table();
1494 /********************************************************************
1496 * sifdefaultroute - assign a default route through the address given.
1499 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1503 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1504 u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway);
1506 if (old_gateway != gateway)
1507 error("not replacing existing default route to %s [%I]",
1508 rt.rt_dev, old_gateway);
1512 memset (&rt, '\0', sizeof (rt));
1513 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1514 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1516 if (kernel_version > KVERSION(2,1,0)) {
1517 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1518 SIN_ADDR(rt.rt_genmask) = 0L;
1521 SIN_ADDR(rt.rt_gateway) = gateway;
1523 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1524 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1525 if ( ! ok_error ( errno ))
1526 error("default route ioctl(SIOCADDRT): %m");
1530 default_route_gateway = gateway;
1534 /********************************************************************
1536 * cifdefaultroute - delete a default route through the address given.
1539 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1543 default_route_gateway = 0;
1545 memset (&rt, '\0', sizeof (rt));
1546 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1547 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1549 if (kernel_version > KVERSION(2,1,0)) {
1550 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1551 SIN_ADDR(rt.rt_genmask) = 0L;
1554 SIN_ADDR(rt.rt_gateway) = gateway;
1556 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1557 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1559 if ( ! ok_error ( errno ))
1560 error("default route ioctl(SIOCDELRT): %m");
1568 /********************************************************************
1570 * sifproxyarp - Make a proxy ARP entry for the peer.
1573 int sifproxyarp (int unit, u_int32_t his_adr)
1575 struct arpreq arpreq;
1578 if (has_proxy_arp == 0) {
1579 memset (&arpreq, '\0', sizeof(arpreq));
1581 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1582 SIN_ADDR(arpreq.arp_pa) = his_adr;
1583 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1585 * Get the hardware address of an interface on the same subnet
1586 * as our local address.
1588 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1589 sizeof(proxy_arp_dev))) {
1590 error("Cannot determine ethernet address for proxy ARP");
1593 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1595 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1596 if ( ! ok_error ( errno ))
1597 error("ioctl(SIOCSARP): %m");
1600 proxy_arp_addr = his_adr;
1604 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward");
1605 if (forw_path != 0) {
1606 int fd = open(forw_path, O_WRONLY);
1608 if (write(fd, "1", 1) != 1)
1609 error("Couldn't enable IP forwarding: %m");
1619 /********************************************************************
1621 * cifproxyarp - Delete the proxy ARP entry for the peer.
1624 int cifproxyarp (int unit, u_int32_t his_adr)
1626 struct arpreq arpreq;
1628 if (has_proxy_arp) {
1630 memset (&arpreq, '\0', sizeof(arpreq));
1631 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1632 SIN_ADDR(arpreq.arp_pa) = his_adr;
1633 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1634 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1636 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1637 if ( ! ok_error ( errno ))
1638 warn("ioctl(SIOCDARP): %m");
1645 /********************************************************************
1647 * get_ether_addr - get the hardware address of an interface on the
1648 * the same subnet as ipaddr.
1651 static int get_ether_addr (u_int32_t ipaddr,
1652 struct sockaddr *hwaddr,
1653 char *name, int namelen)
1655 struct ifreq *ifr, *ifend;
1656 u_int32_t ina, mask;
1660 struct ifreq ifs[MAX_IFS];
1662 ifc.ifc_len = sizeof(ifs);
1664 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1665 if ( ! ok_error ( errno ))
1666 error("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1670 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1671 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1673 * Scan through looking for an interface with an Internet
1674 * address on the same subnet as `ipaddr'.
1676 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1677 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1678 if (ifr->ifr_addr.sa_family == AF_INET) {
1679 ina = SIN_ADDR(ifr->ifr_addr);
1680 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1681 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1684 * Check that the interface is up, and not point-to-point
1687 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1690 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1693 * Get its netmask and check that it's on the right subnet.
1695 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1698 mask = SIN_ADDR(ifreq.ifr_addr);
1699 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1700 ip_ntoa(ina), ntohl(mask)));
1702 if (((ipaddr ^ ina) & mask) != 0)
1711 strlcpy(name, ifreq.ifr_name, namelen);
1713 /* trim off the :1 in eth0:1 */
1714 aliasp = strchr(name, ':');
1718 info("found interface %s for proxy arp", name);
1720 * Now get the hardware address.
1722 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1723 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) {
1724 error("SIOCGIFHWADDR(%s): %m", ifreq.ifr_name);
1730 sizeof (struct sockaddr));
1732 SYSDEBUG ((LOG_DEBUG,
1733 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1734 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1735 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1736 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1737 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1738 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1739 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1740 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1741 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1746 * get_if_hwaddr - get the hardware address for the specified
1747 * network interface device.
1750 get_if_hwaddr(u_char *addr, char *name)
1755 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
1758 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
1759 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
1760 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
1763 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
1768 * get_first_ethernet - return the name of the first ethernet-style
1769 * interface on this system.
1772 get_first_ethernet()
1777 /********************************************************************
1779 * Return user specified netmask, modified by any mask we might determine
1780 * for address `addr' (in network byte order).
1781 * Here we scan through the system's list of interfaces, looking for
1782 * any non-point-to-point interfaces which might appear to be on the same
1783 * network as `addr'. If we find any, we OR in their netmask to the
1784 * user-specified netmask.
1787 u_int32_t GetMask (u_int32_t addr)
1789 u_int32_t mask, nmask, ina;
1790 struct ifreq *ifr, *ifend, ifreq;
1792 struct ifreq ifs[MAX_IFS];
1796 if (IN_CLASSA(addr)) /* determine network mask for address class */
1797 nmask = IN_CLASSA_NET;
1798 else if (IN_CLASSB(addr))
1799 nmask = IN_CLASSB_NET;
1801 nmask = IN_CLASSC_NET;
1803 /* class D nets are disallowed by bad_ip_adrs */
1804 mask = netmask | htonl(nmask);
1806 * Scan through the system's network interfaces.
1808 ifc.ifc_len = sizeof(ifs);
1810 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1811 if ( ! ok_error ( errno ))
1812 warn("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__);
1816 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1817 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1819 * Check the interface's internet address.
1821 if (ifr->ifr_addr.sa_family != AF_INET)
1823 ina = SIN_ADDR(ifr->ifr_addr);
1824 if (((ntohl(ina) ^ addr) & nmask) != 0)
1827 * Check that the interface is up, and not point-to-point nor loopback.
1829 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1830 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1833 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1836 * Get its netmask and OR it into our mask.
1838 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1840 mask |= SIN_ADDR(ifreq.ifr_addr);
1846 /********************************************************************
1848 * Internal routine to decode the version.modification.patch level
1851 static void decode_version (char *buf, int *version,
1852 int *modification, int *patch)
1856 *version = (int) strtoul (buf, &endp, 10);
1860 if (endp != buf && *endp == '.') {
1862 *modification = (int) strtoul (buf, &endp, 10);
1863 if (endp != buf && *endp == '.') {
1865 *patch = (int) strtoul (buf, &buf, 10);
1870 /********************************************************************
1872 * Procedure to determine if the PPP line discipline is registered.
1876 ppp_registered(void)
1884 * We used to open the serial device and set it to the ppp line
1885 * discipline here, in order to create a ppp unit. But that is
1886 * not a good idea - the user might have specified a device that
1887 * they can't open (permission, or maybe it doesn't really exist).
1888 * So we grab a pty master/slave pair and use that.
1890 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1891 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1896 * Try to put the device into the PPP discipline.
1898 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1899 error("ioctl(TIOCSETD(PPP)): %m (line %d)", __LINE__);
1908 /********************************************************************
1910 * ppp_available - check whether the system has any ppp interfaces
1911 * (in fact we check whether we can do an ioctl on ppp0).
1914 int ppp_available(void)
1919 int my_version, my_modification, my_patch;
1920 int osmaj, osmin, ospatch;
1923 "This system lacks kernel support for PPP. This could be because\n"
1924 "the PPP kernel module could not be loaded, or because PPP was not\n"
1925 "included in the kernel configuration. If PPP was included as a\n"
1926 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
1927 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
1928 "See README.linux file in the ppp distribution for more details.\n";
1930 /* get the kernel version now, since we are called before sys_init */
1932 osmaj = osmin = ospatch = 0;
1933 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
1934 kernel_version = KVERSION(osmaj, osmin, ospatch);
1936 fd = open("/dev/ppp", O_RDWR);
1938 if (fd < 0 && errno == ENOENT) {
1939 /* try making it and see if that helps. */
1940 if (mknod("/dev/ppp", S_IFCHR | S_IRUSR | S_IWUSR,
1941 makedev(108, 0)) >= 0) {
1942 fd = open("/dev/ppp", O_RDWR);
1944 info("Created /dev/ppp device node");
1946 unlink("/dev/ppp"); /* didn't work, undo the mknod */
1947 } else if (errno == EEXIST) {
1948 fd = open("/dev/ppp", O_RDWR);
1953 new_style_driver = 1;
1955 /* XXX should get from driver */
1957 driver_modification = 4;
1962 if (kernel_version >= KVERSION(2,3,13)) {
1963 if (errno == ENOENT)
1965 "pppd is unable to open the /dev/ppp device.\n"
1966 "You need to create the /dev/ppp device node by\n"
1967 "executing the following command as root:\n"
1968 " mknod /dev/ppp c 108 0\n";
1973 * Open a socket for doing the ioctl operations.
1975 s = socket(AF_INET, SOCK_DGRAM, 0);
1979 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1980 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1982 * If the device did not exist then attempt to create one by putting the
1983 * current tty into the PPP discipline. If this works then obtain the
1984 * flags for the device again.
1987 if (ppp_registered()) {
1988 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1989 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1993 * Ensure that the hardware address is for PPP and not something else
1996 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1998 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
2002 * This is the PPP device. Validate the version of the driver at this
2003 * point to ensure that this program will work with the driver.
2006 char abBuffer [1024];
2008 ifr.ifr_data = abBuffer;
2009 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
2011 error("Couldn't read driver version: %m");
2013 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
2016 decode_version(abBuffer,
2018 &driver_modification,
2021 * Validate the version of the driver against the version that we used.
2023 decode_version(VERSION,
2028 /* The version numbers must match */
2029 if (driver_version != my_version)
2032 /* The modification levels must be legal */
2033 if (driver_modification < 3) {
2034 if (driver_modification >= 2) {
2035 /* we can cope with 2.2.0 and above */
2044 slprintf(route_buffer, sizeof(route_buffer),
2045 "Sorry - PPP driver version %d.%d.%d is out of date\n",
2046 driver_version, driver_modification, driver_patch);
2048 no_ppp_msg = route_buffer;
2055 /********************************************************************
2057 * Update the wtmp file with the appropriate user name and tty device.
2060 void logwtmp (const char *line, const char *name, const char *host)
2062 struct utmp ut, *utp;
2063 pid_t mypid = getpid();
2069 * Update the signon database for users.
2070 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
2072 utmpname(_PATH_UTMP);
2074 while ((utp = getutent()) && (utp->ut_pid != mypid))
2077 /* Is this call really necessary? There is another one after the 'put' */
2081 memcpy(&ut, utp, sizeof(ut));
2083 /* some gettys/telnetds don't initialize utmp... */
2084 memset(&ut, 0, sizeof(ut));
2086 if (ut.ut_id[0] == 0)
2087 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
2089 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
2090 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
2094 ut.ut_type = USER_PROCESS;
2097 /* Insert the host name if one is supplied */
2099 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
2101 /* Insert the IP address of the remote system if IP is enabled */
2102 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
2103 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
2104 sizeof(ut.ut_addr));
2106 /* CL: Makes sure that the logout works */
2107 if (*host == 0 && *name==0)
2113 * Update the wtmp file.
2116 updwtmp(_PATH_WTMP, &ut);
2118 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
2120 flock(wtmp, LOCK_EX);
2122 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut))
2123 warn("error writing %s: %m", _PATH_WTMP);
2125 flock(wtmp, LOCK_UN);
2133 /********************************************************************
2135 * sifvjcomp - config tcp header compression
2138 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2140 u_int x = get_flags(ppp_dev_fd);
2143 if (ioctl (ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
2144 if (! ok_error (errno))
2145 error("ioctl(PPPIOCSMAXCID): %m (line %d)", __LINE__);
2150 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
2151 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
2152 set_flags (ppp_dev_fd, x);
2157 /********************************************************************
2159 * sifup - Config the interface up and enable IP packets to pass.
2166 memset (&ifr, '\0', sizeof (ifr));
2167 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2168 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2169 if (! ok_error (errno))
2170 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2174 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2175 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2176 if (! ok_error (errno))
2177 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2185 /********************************************************************
2187 * sifdown - Disable the indicated protocol and config the interface
2188 * down if there are no remaining protocols.
2195 if (if_is_up && --if_is_up > 0)
2198 memset (&ifr, '\0', sizeof (ifr));
2199 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2200 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2201 if (! ok_error (errno))
2202 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__);
2206 ifr.ifr_flags &= ~IFF_UP;
2207 ifr.ifr_flags |= IFF_POINTOPOINT;
2208 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2209 if (! ok_error (errno))
2210 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__);
2216 /********************************************************************
2218 * sifaddr - Config the interface IP addresses and netmask.
2221 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2227 memset (&ifr, '\0', sizeof (ifr));
2228 memset (&rt, '\0', sizeof (rt));
2230 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2231 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2232 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2234 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2236 * Set our IP address
2238 SIN_ADDR(ifr.ifr_addr) = our_adr;
2239 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2240 if (errno != EEXIST) {
2241 if (! ok_error (errno))
2242 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2245 warn("ioctl(SIOCSIFADDR): Address already exists");
2250 * Set the gateway address
2252 SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
2253 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2254 if (! ok_error (errno))
2255 error("ioctl(SIOCSIFDSTADDR): %m (line %d)", __LINE__);
2260 * For recent kernels, force the netmask to 255.255.255.255.
2262 if (kernel_version >= KVERSION(2,1,16))
2264 if (net_mask != 0) {
2265 SIN_ADDR(ifr.ifr_netmask) = net_mask;
2266 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2267 if (! ok_error (errno))
2268 error("ioctl(SIOCSIFNETMASK): %m (line %d)", __LINE__);
2273 * Add the device route
2275 if (kernel_version < KVERSION(2,1,16)) {
2276 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2277 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2280 SIN_ADDR(rt.rt_gateway) = 0L;
2281 SIN_ADDR(rt.rt_dst) = his_adr;
2282 rt.rt_flags = RTF_UP | RTF_HOST;
2284 if (kernel_version > KVERSION(2,1,0)) {
2285 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2286 SIN_ADDR(rt.rt_genmask) = -1L;
2289 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2290 if (! ok_error (errno))
2291 error("ioctl(SIOCADDRT) device route: %m (line %d)", __LINE__);
2296 /* set ip_dynaddr in demand mode if address changes */
2297 if (demand && tune_kernel && !dynaddr_set
2298 && our_old_addr && our_old_addr != our_adr) {
2299 /* set ip_dynaddr if possible */
2303 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
2304 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
2305 if (write(fd, "1", 1) != 1)
2306 error("Couldn't enable dynamic IP addressing: %m");
2309 dynaddr_set = 1; /* only 1 attempt */
2316 /********************************************************************
2318 * cifaddr - Clear the interface IP addresses, and delete routes
2319 * through the interface if possible.
2322 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2326 if (kernel_version < KVERSION(2,1,16)) {
2328 * Delete the route through the device
2331 memset (&rt, '\0', sizeof (rt));
2333 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2334 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2337 SIN_ADDR(rt.rt_gateway) = 0;
2338 SIN_ADDR(rt.rt_dst) = his_adr;
2339 rt.rt_flags = RTF_UP | RTF_HOST;
2341 if (kernel_version > KVERSION(2,1,0)) {
2342 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2343 SIN_ADDR(rt.rt_genmask) = -1L;
2346 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2347 if (still_ppp() && ! ok_error (errno))
2348 error("ioctl(SIOCDELRT) device route: %m (line %d)", __LINE__);
2353 /* This way it is possible to have an IPX-only or IPv6-only interface */
2354 memset(&ifr, 0, sizeof(ifr));
2355 SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
2356 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2358 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2359 if (! ok_error (errno)) {
2360 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2365 our_old_addr = our_adr;
2371 /********************************************************************
2373 * sif6addr - Config the interface with an IPv6 link-local address
2375 int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2377 struct in6_ifreq ifr6;
2379 struct in6_rtmsg rt6;
2383 error("IPv6 socket creation failed: %m");
2386 memset(&ifr, 0, sizeof (ifr));
2387 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2388 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2389 error("sif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2393 /* Local interface */
2394 memset(&ifr6, 0, sizeof(ifr6));
2395 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2396 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2397 ifr6.ifr6_prefixlen = 10;
2399 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
2400 error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
2404 /* Route to remote host */
2405 memset(&rt6, 0, sizeof(rt6));
2406 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
2407 rt6.rtmsg_flags = RTF_UP;
2408 rt6.rtmsg_dst_len = 10;
2409 rt6.rtmsg_ifindex = ifr.ifr_ifindex;
2410 rt6.rtmsg_metric = 1;
2412 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
2413 error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
2421 /********************************************************************
2423 * cif6addr - Remove IPv6 address from interface
2425 int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2428 struct in6_ifreq ifr6;
2432 error("IPv6 socket creation failed: %m");
2435 memset(&ifr, 0, sizeof(ifr));
2436 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2437 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2438 error("cif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__);
2442 memset(&ifr6, 0, sizeof(ifr6));
2443 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2444 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2445 ifr6.ifr6_prefixlen = 10;
2447 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
2448 if (errno != EADDRNOTAVAIL) {
2449 if (! ok_error (errno))
2450 error("cif6addr: ioctl(SIOCDIFADDR): %m (line %d)", __LINE__);
2453 warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
2462 * get_pty - get a pty master/slave pair and chown the slave side
2463 * to the uid given. Assumes slave_name points to >= 16 bytes of space.
2466 get_pty(master_fdp, slave_fdp, slave_name, uid)
2472 int i, mfd, sfd = -1;
2474 struct termios tios;
2478 * Try the unix98 way first.
2480 mfd = open("/dev/ptmx", O_RDWR);
2483 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
2484 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
2485 chmod(pty_name, S_IRUSR | S_IWUSR);
2488 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
2489 warn("Couldn't unlock pty slave %s: %m", pty_name);
2491 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0)
2492 warn("Couldn't open pty slave %s: %m", pty_name);
2495 #endif /* TIOCGPTN */
2498 /* the old way - scan through the pty name space */
2499 for (i = 0; i < 64; ++i) {
2500 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2501 'p' + i / 16, i % 16);
2502 mfd = open(pty_name, O_RDWR, 0);
2505 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2507 fchown(sfd, uid, -1);
2508 fchmod(sfd, S_IRUSR | S_IWUSR);
2519 strlcpy(slave_name, pty_name, 16);
2522 if (tcgetattr(sfd, &tios) == 0) {
2523 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2524 tios.c_cflag |= CS8 | CREAD | CLOCAL;
2525 tios.c_iflag = IGNPAR;
2528 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2529 warn("couldn't set attributes on pty: %m");
2531 warn("couldn't get attributes on pty: %m");
2536 /********************************************************************
2538 * open_loopback - open the device we use for getting packets
2539 * in demand mode. Under Linux, we use a pty master/slave pair.
2542 open_ppp_loopback(void)
2547 if (new_style_driver) {
2548 /* allocate ourselves a ppp unit */
2549 if (make_ppp_unit() < 0)
2551 set_flags(ppp_dev_fd, SC_LOOP_TRAFFIC);
2552 set_kdebugflag(kdebugflag);
2557 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2558 fatal("No free pty for loopback");
2559 SYSDEBUG(("using %s for loopback", loop_name));
2561 set_ppp_fd(slave_fd);
2563 flags = fcntl(master_fd, F_GETFL);
2565 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2566 warn("couldn't set master loopback to nonblock: %m");
2568 flags = fcntl(ppp_fd, F_GETFL);
2570 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2571 warn("couldn't set slave loopback to nonblock: %m");
2573 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2574 fatal("ioctl(TIOCSETD): %m (line %d)", __LINE__);
2576 * Find out which interface we were given.
2578 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2579 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__);
2581 * Enable debug in the driver if requested.
2583 set_kdebugflag (kdebugflag);
2588 /********************************************************************
2590 * sifnpmode - Set the mode for handling packets for a given NP.
2594 sifnpmode(u, proto, mode)
2601 npi.protocol = proto;
2603 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2604 if (! ok_error (errno))
2605 error("ioctl(PPPIOCSNPMODE, %d, %d): %m", proto, mode);
2612 /********************************************************************
2614 * sipxfaddr - Config the interface IPX networknumber
2617 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2624 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2626 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2628 if (! ok_error (errno))
2629 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2633 memset (&ifr, '\0', sizeof (ifr));
2634 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2636 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2637 sipx->sipx_family = AF_IPX;
2638 sipx->sipx_port = 0;
2639 sipx->sipx_network = htonl (network);
2640 sipx->sipx_type = IPX_FRAME_ETHERII;
2641 sipx->sipx_action = IPX_CRTITF;
2643 * Set the IPX device
2645 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2647 if (errno != EEXIST) {
2648 if (! ok_error (errno))
2649 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (line %d)", __LINE__);
2652 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2661 /********************************************************************
2663 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2664 * are removed and the device is no longer able to pass IPX
2668 int cipxfaddr (int unit)
2675 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2677 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2679 if (! ok_error (errno))
2680 dbglog("socket(AF_IPX): %m (line %d)", __LINE__);
2684 memset (&ifr, '\0', sizeof (ifr));
2685 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2687 sipx->sipx_type = IPX_FRAME_ETHERII;
2688 sipx->sipx_action = IPX_DLTITF;
2689 sipx->sipx_family = AF_IPX;
2691 * Set the IPX device
2693 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2694 if (! ok_error (errno))
2695 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (line %d)", __LINE__);
2705 * Use the hostname as part of the random number seed.
2714 for (p = hostname; *p != 0; ++p)
2719 /********************************************************************
2721 * sys_check_options - check the options that the user specified
2725 sys_check_options(void)
2729 * Disable the IPX protocol if the support is not present in the kernel.
2733 if (ipxcp_protent.enabled_flag) {
2734 struct stat stat_buf;
2735 if ((path = path_to_procfs("/net/ipx_interface")) == 0
2736 || lstat(path, &stat_buf) < 0) {
2737 error("IPX support is not present in the kernel\n");
2738 ipxcp_protent.enabled_flag = 0;
2742 if (demand && driver_is_old) {
2743 option_error("demand dialling is not supported by kernel driver "
2744 "version %d.%d.%d", driver_version, driver_modification,
2748 if (multilink && !new_style_driver) {
2749 warn("Warning: multilink is not supported by the kernel driver");