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 static 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");
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", flags, errno);
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");
349 SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
354 /********************************************************************
356 * establish_ppp - Turn the serial port into a ppp interface.
359 int establish_ppp (int tty_fd)
365 * Ensure that the tty device is in exclusive mode.
367 if (ioctl(tty_fd, TIOCEXCL, 0) < 0) {
368 if ( ! ok_error ( errno ))
369 warn("Couldn't make tty exclusive: %m");
372 * Demand mode - prime the old ppp device to relinquish the unit.
374 if (!new_style_driver && looped
375 && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0) {
376 error("ioctl(transfer ppp unit): %m");
380 * Set the current tty to the PPP discpline
384 #define N_SYNC_PPP 14
386 ppp_disc = (new_style_driver && sync_serial)? N_SYNC_PPP: N_PPP;
387 if (ioctl(tty_fd, TIOCSETD, &ppp_disc) < 0) {
388 if ( ! ok_error (errno) ) {
389 error("Couldn't set tty to PPP discipline: %m");
394 if (new_style_driver) {
395 /* Open another instance of /dev/ppp and connect the channel to it */
398 if (ioctl(tty_fd, PPPIOCGCHAN, &chindex) == -1) {
399 error("Couldn't get channel number: %m");
402 dbglog("using channel %d", chindex);
403 fd = open("/dev/ppp", O_RDWR);
405 error("Couldn't reopen /dev/ppp: %m");
408 if (ioctl(fd, PPPIOCATTCHAN, &chindex) < 0) {
409 error("Couldn't attach to channel %d: %m", chindex);
412 flags = fcntl(fd, F_GETFL);
413 if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
414 warn("Couldn't set /dev/ppp (channel) to nonblock: %m");
419 if (!looped && !multilink) {
421 * Create a new PPP unit.
423 if (make_ppp_unit() < 0)
428 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) & ~SC_LOOP_TRAFFIC);
432 if (ioctl(fd, PPPIOCCONNECT, &ifunit) < 0) {
433 error("Couldn't attach to PPP unit %d: %m", ifunit);
440 * Old-style driver: find out which interface we were given.
443 if (ioctl(tty_fd, PPPIOCGUNIT, &x) < 0) {
444 if (ok_error (errno))
446 fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
448 /* Check that we got the same unit again. */
449 if (looped && x != ifunit)
450 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
454 * Fetch the initial file flags and reset blocking mode on the file.
456 initfdflags = fcntl(tty_fd, F_GETFL);
457 if (initfdflags == -1 ||
458 fcntl(tty_fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
459 if ( ! ok_error (errno))
460 warn("Couldn't set device to non-blocking mode: %m");
467 * Enable debug in the driver if requested.
470 set_kdebugflag (kdebugflag);
472 #define SC_RCVB (SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP)
473 #define SC_LOGB (SC_DEBUG | SC_LOG_INPKT | SC_LOG_OUTPKT | SC_LOG_RAWIN \
476 set_flags(ppp_fd, ((get_flags(ppp_fd) & ~(SC_RCVB | SC_LOGB))
477 | ((kdebugflag * SC_DEBUG) & SC_LOGB)));
479 SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
480 driver_version, driver_modification, driver_patch));
487 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0 && !ok_error(errno))
488 warn("Couldn't reset tty to normal line discipline: %m");
492 /********************************************************************
494 * disestablish_ppp - Restore the serial port to normal operation.
495 * This shouldn't call die() because it's called from die().
498 void disestablish_ppp(int tty_fd)
502 * Flush the tty output buffer so that the TIOCSETD doesn't hang.
504 if (tcflush(tty_fd, TCIOFLUSH) < 0)
505 warn("tcflush failed: %m");
507 * Restore the previous line discipline
509 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
510 if ( ! ok_error (errno))
511 error("ioctl(TIOCSETD, N_TTY): %m");
514 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
515 if ( ! ok_error (errno))
516 warn("ioctl(TIOCNXCL): %m(%d)", errno);
519 /* Reset non-blocking mode on fd. */
520 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
521 if ( ! ok_error (errno))
522 warn("Couldn't restore device fd flags: %m");
527 if (new_style_driver) {
530 if (!looped && ifunit >= 0 && ioctl(ppp_dev_fd, PPPIOCDETACH) < 0)
531 error("Couldn't release PPP unit: %m");
533 remove_fd(ppp_dev_fd);
538 * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
539 * Assumes new_style_driver.
541 static int make_ppp_unit()
546 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
547 if (x < 0 && req_unit >= 0 && errno == EEXIST) {
548 warn("Couldn't allocate PPP unit %d as it is already in use");
550 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
553 error("Couldn't create new ppp unit: %m");
558 * cfg_bundle - configure the existing bundle.
559 * Used in demand mode.
561 void cfg_bundle(int mrru, int mtru, int rssn, int tssn)
565 if (!new_style_driver)
568 /* set the mrru, mtu and flags */
569 if (ioctl(ppp_dev_fd, PPPIOCSMRRU, &mrru) < 0)
570 error("Couldn't set MRRU: %m");
571 flags = get_flags(ppp_dev_fd);
572 flags &= ~(SC_MP_SHORTSEQ | SC_MP_XSHORTSEQ);
573 flags |= (rssn? SC_MP_SHORTSEQ: 0) | (tssn? SC_MP_XSHORTSEQ: 0)
574 | (mrru? SC_MULTILINK: 0);
576 set_flags(ppp_dev_fd, flags);
578 /* connect up the channel */
579 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0)
580 fatal("Couldn't attach to PPP unit %d: %m", ifunit);
585 * make_new_bundle - create a new PPP unit (i.e. a bundle)
586 * and connect our channel to it. This should only get called
587 * if `multilink' was set at the time establish_ppp was called.
588 * In demand mode this uses our existing bundle instead of making
591 void make_new_bundle(int mrru, int mtru, int rssn, int tssn)
593 if (!new_style_driver)
596 /* make us a ppp unit */
597 if (make_ppp_unit() < 0)
600 /* set the mrru and flags */
601 cfg_bundle(mrru, mtru, rssn, tssn);
605 * bundle_attach - attach our link to a given PPP unit.
606 * We assume the unit is controlled by another pppd.
608 int bundle_attach(int ifnum)
610 if (!new_style_driver)
613 if (ioctl(ppp_dev_fd, PPPIOCATTACH, &ifnum) < 0) {
615 return 0; /* doesn't still exist */
616 fatal("Couldn't attach to interface unit %d: %m\n", ifnum);
618 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifnum) < 0)
619 fatal("Couldn't connect to interface unit %d: %m", ifnum);
620 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_MULTILINK);
626 /********************************************************************
628 * clean_check - Fetch the flags for the device and generate
629 * appropriate error messages.
631 void clean_check(void)
637 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
639 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
641 s = "all had bit 7 set to 1";
645 s = "all had bit 7 set to 0";
649 s = "all had odd parity";
653 s = "all had even parity";
658 warn("Receive serial link is not 8-bit clean:");
659 warn("Problem: %s", s);
667 * List of valid speeds.
671 int speed_int, speed_val;
754 /********************************************************************
756 * Translate from bits/second to a speed_t.
759 static int translate_speed (int bps)
761 struct speed *speedp;
764 for (speedp = speeds; speedp->speed_int; speedp++) {
765 if (bps == speedp->speed_int)
766 return speedp->speed_val;
768 warn("speed %d not supported", bps);
773 /********************************************************************
775 * Translate from a speed_t to bits/second.
778 static int baud_rate_of (int speed)
780 struct speed *speedp;
783 for (speedp = speeds; speedp->speed_int; speedp++) {
784 if (speed == speedp->speed_val)
785 return speedp->speed_int;
791 /********************************************************************
793 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
794 * at the requested speed, etc. If `local' is true, set CLOCAL
795 * regardless of whether the modem option was specified.
798 void set_up_tty(int tty_fd, int local)
804 if (tcgetattr(tty_fd, &tios) < 0) {
805 if (!ok_error(errno))
806 fatal("tcgetattr: %m(%d)", errno);
813 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
814 tios.c_cflag |= CS8 | CREAD | HUPCL;
816 tios.c_iflag = IGNBRK | IGNPAR;
820 tios.c_cc[VTIME] = 0;
823 tios.c_cflag ^= (CLOCAL | HUPCL);
827 tios.c_cflag |= CRTSCTS;
831 tios.c_iflag |= IXON | IXOFF;
832 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
833 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
837 tios.c_cflag &= ~CRTSCTS;
844 speed = translate_speed(inspeed);
846 cfsetospeed (&tios, speed);
847 cfsetispeed (&tios, speed);
850 * We can't proceed if the serial port speed is B0,
851 * since that implies that the serial port is disabled.
854 speed = cfgetospeed(&tios);
856 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
859 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
860 if (!ok_error(errno))
861 fatal("tcsetattr: %m");
863 baud_rate = baud_rate_of(speed);
867 /********************************************************************
869 * setdtr - control the DTR line on the serial port.
870 * This is called from die(), so it shouldn't call die().
873 void setdtr (int tty_fd, int on)
875 int modembits = TIOCM_DTR;
877 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
880 /********************************************************************
882 * restore_tty - restore the terminal to the saved settings.
885 void restore_tty (int tty_fd)
890 * Turn off echoing, because otherwise we can get into
891 * a loop with the tty and the modem echoing to each other.
892 * We presume we are the sole user of this tty device, so
893 * when we close it, it will revert to its defaults anyway.
896 inittermios.c_lflag &= ~(ECHO | ECHONL);
898 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
899 if (! ok_error (errno))
900 warn("tcsetattr: %m");
905 /********************************************************************
907 * output - Output PPP packet.
910 void output (int unit, unsigned char *p, int len)
916 dbglog("sent %P", p, len);
918 if (len < PPP_HDRLEN)
920 if (new_style_driver) {
923 proto = (p[0] << 8) + p[1];
924 if (ifunit >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
927 if (write(fd, p, len) < 0) {
928 if (errno == EWOULDBLOCK || errno == ENOBUFS
929 || errno == ENXIO || errno == EIO || errno == EINTR)
930 warn("write: warning: %m (%d)", errno);
932 error("write: %m (%d)", errno);
936 /********************************************************************
938 * wait_input - wait until there is data available,
939 * for the length of time specified by *timo (indefinite
943 void wait_input(struct timeval *timo)
950 n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
951 if (n < 0 && errno != EINTR)
952 fatal("select: %m(%d)", errno);
956 * add_fd - add an fd to the set that wait_input waits for.
966 * remove_fd - remove an fd from the set that wait_input waits for.
968 void remove_fd(int fd)
974 /********************************************************************
976 * read_packet - get a PPP packet from the serial device.
979 int read_packet (unsigned char *buf)
983 len = PPP_MRU + PPP_HDRLEN;
984 if (new_style_driver) {
985 *buf++ = PPP_ALLSTATIONS;
991 nr = read(ppp_fd, buf, len);
992 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
995 if (nr < 0 && new_style_driver && ifunit >= 0) {
996 /* N.B. we read ppp_fd first since LCP packets come in there. */
997 nr = read(ppp_dev_fd, buf, len);
998 if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
999 error("read /dev/ppp: %m");
1001 return (new_style_driver && nr > 0)? nr+2: nr;
1004 /********************************************************************
1006 * get_loop_output - get outgoing packets from the ppp device,
1007 * and detect when we want to bring the real link up.
1008 * Return value is 1 if we need to bring up the link, 0 otherwise.
1011 get_loop_output(void)
1016 if (new_style_driver) {
1017 while ((n = read_packet(inpacket_buf)) > 0)
1018 if (loop_frame(inpacket_buf, n))
1023 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
1024 if (loop_chars(inbuf, n))
1028 fatal("eof on loopback");
1030 if (errno != EWOULDBLOCK)
1031 fatal("read from loopback: %m(%d)", errno);
1037 * netif_set_mtu - set the MTU on the PPP network interface.
1040 netif_set_mtu(int unit, int mtu)
1044 SYSDEBUG ((LOG_DEBUG, "netif_set_mtu: mtu = %d\n", mtu));
1046 memset (&ifr, '\0', sizeof (ifr));
1047 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1050 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
1051 fatal("ioctl(SIOCSIFMTU): %m(%d)", errno);
1054 /********************************************************************
1056 * tty_send_config - configure the transmit characteristics of
1057 * the ppp interface.
1060 void tty_send_config (int mtu,u_int32_t asyncmap,int pcomp,int accomp)
1065 * Set the asyncmap and other parameters for the ppp device
1070 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
1071 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
1072 if (!ok_error(errno))
1073 fatal("ioctl(PPPIOCSASYNCMAP): %m(%d)", errno);
1077 x = get_flags(ppp_fd);
1078 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
1079 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
1080 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
1081 set_flags(ppp_fd, x);
1084 /********************************************************************
1086 * tty_set_xaccm - set the extended transmit ACCM for the interface.
1089 void tty_set_xaccm (ext_accm accm)
1091 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
1092 accm[0], accm[1], accm[2], accm[3]));
1096 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
1097 if ( ! ok_error (errno))
1098 warn("ioctl(set extended ACCM): %m(%d)", errno);
1102 /********************************************************************
1104 * tty_recv_config - configure the receive-side characteristics of
1105 * the ppp interface.
1108 void tty_recv_config (int mru,u_int32_t asyncmap,int pcomp,int accomp)
1110 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
1112 * If we were called because the link has gone down then there is nothing
1113 * which may be done. Just return without incident.
1118 * Set the receiver parameters
1120 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
1121 if ( ! ok_error (errno))
1122 error("ioctl(PPPIOCSMRU): %m(%d)", errno);
1124 if (new_style_driver && ifunit >= 0
1125 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1126 error("Couldn't set MRU in generic PPP layer: %m");
1128 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
1129 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
1130 if (!ok_error(errno))
1131 error("ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno);
1135 /********************************************************************
1137 * ccp_test - ask kernel whether a given compression method
1138 * is acceptable for use.
1141 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1143 struct ppp_option_data data;
1145 memset (&data, '\0', sizeof (data));
1147 data.length = opt_len;
1148 data.transmit = for_transmit;
1150 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1153 return (errno == ENOBUFS)? 0: -1;
1156 /********************************************************************
1158 * ccp_flags_set - inform kernel about the current state of CCP.
1161 void ccp_flags_set (int unit, int isopen, int isup)
1164 int x = get_flags(ppp_dev_fd);
1165 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
1166 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
1167 set_flags (ppp_dev_fd, x);
1173 * set_filters - set the active and pass filters in the kernel driver.
1175 int set_filters(struct bpf_program *pass, struct bpf_program *active)
1177 struct sock_fprog fp;
1179 fp.len = pass->bf_len;
1180 fp.filter = (struct sock_filter *) pass->bf_insns;
1181 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) {
1182 if (errno == ENOTTY)
1183 warn("kernel does not support PPP filtering");
1185 error("Couldn't set pass-filter in kernel: %m");
1188 fp.len = active->bf_len;
1189 fp.filter = (struct sock_filter *) active->bf_insns;
1190 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) {
1191 error("Couldn't set active-filter in kernel: %m");
1196 #endif /* PPP_FILTER */
1198 /********************************************************************
1200 * get_idle_time - return how long the link has been idle.
1203 get_idle_time(u, ip)
1205 struct ppp_idle *ip;
1207 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
1210 /********************************************************************
1212 * get_ppp_stats - return statistics for the link.
1215 get_ppp_stats(u, stats)
1217 struct pppd_stats *stats;
1219 struct ifpppstatsreq req;
1221 memset (&req, 0, sizeof (req));
1223 req.stats_ptr = (caddr_t) &req.stats;
1224 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
1225 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
1226 error("Couldn't get PPP statistics: %m");
1229 stats->bytes_in = req.stats.p.ppp_ibytes;
1230 stats->bytes_out = req.stats.p.ppp_obytes;
1234 /********************************************************************
1236 * ccp_fatal_error - returns 1 if decompression was disabled as a
1237 * result of an error detected after decompression of a packet,
1238 * 0 otherwise. This is necessary because of patent nonsense.
1241 int ccp_fatal_error (int unit)
1243 int x = get_flags(ppp_dev_fd);
1245 return x & SC_DC_FERROR;
1248 /********************************************************************
1250 * path_to_procfs - find the path to the proc file system mount point
1252 static char proc_path[MAXPATHLEN];
1253 static int proc_path_len;
1255 static char *path_to_procfs(const char *tail)
1257 struct mntent *mntent;
1260 if (proc_path_len == 0) {
1261 /* Default the mount location of /proc */
1262 strlcpy (proc_path, "/proc", sizeof(proc_path));
1264 fp = fopen(MOUNTED, "r");
1266 while ((mntent = getmntent(fp)) != NULL) {
1267 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1269 if (strcmp(mntent->mnt_type, "proc") == 0) {
1270 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path));
1271 proc_path_len = strlen(proc_path);
1279 strlcpy(proc_path + proc_path_len, tail,
1280 sizeof(proc_path) - proc_path_len);
1285 * /proc/net/route parsing stuff.
1287 #define ROUTE_MAX_COLS 12
1288 FILE *route_fd = (FILE *) 0;
1289 static char route_buffer[512];
1290 static int route_dev_col, route_dest_col, route_gw_col;
1291 static int route_flags_col, route_mask_col;
1292 static int route_num_cols;
1294 static int open_route_table (void);
1295 static void close_route_table (void);
1296 static int read_route_table (struct rtentry *rt);
1298 /********************************************************************
1300 * close_route_table - close the interface to the route table
1303 static void close_route_table (void)
1305 if (route_fd != (FILE *) 0) {
1307 route_fd = (FILE *) 0;
1311 /********************************************************************
1313 * open_route_table - open the interface to the route table
1315 static char route_delims[] = " \t\n";
1317 static int open_route_table (void)
1321 close_route_table();
1323 path = path_to_procfs("/net/route");
1324 route_fd = fopen (path, "r");
1325 if (route_fd == NULL) {
1326 error("can't open routing table %s: %m", path);
1330 route_dev_col = 0; /* default to usual columns */
1333 route_flags_col = 3;
1337 /* parse header line */
1338 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1339 char *p = route_buffer, *q;
1341 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1343 if ((q = strtok(p, route_delims)) == 0)
1345 if (strcasecmp(q, "iface") == 0)
1346 route_dev_col = col;
1347 else if (strcasecmp(q, "destination") == 0)
1348 route_dest_col = col;
1349 else if (strcasecmp(q, "gateway") == 0)
1351 else if (strcasecmp(q, "flags") == 0)
1352 route_flags_col = col;
1353 else if (strcasecmp(q, "mask") == 0)
1354 route_mask_col = col;
1357 if (used && col >= route_num_cols)
1358 route_num_cols = col + 1;
1366 /********************************************************************
1368 * read_route_table - read the next entry from the route table
1371 static int read_route_table(struct rtentry *rt)
1373 char *cols[ROUTE_MAX_COLS], *p;
1376 memset (rt, '\0', sizeof (struct rtentry));
1378 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1382 for (col = 0; col < route_num_cols; ++col) {
1383 cols[col] = strtok(p, route_delims);
1384 if (cols[col] == NULL)
1385 return 0; /* didn't get enough columns */
1389 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
1390 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
1391 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
1393 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1394 rt->rt_dev = cols[route_dev_col];
1399 /********************************************************************
1401 * defaultroute_exists - determine if there is a default route
1404 static int defaultroute_exists (struct rtentry *rt)
1408 if (!open_route_table())
1411 while (read_route_table(rt) != 0) {
1412 if ((rt->rt_flags & RTF_UP) == 0)
1415 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
1417 if (SIN_ADDR(rt->rt_dst) == 0L) {
1423 close_route_table();
1428 * have_route_to - determine if the system has any route to
1429 * a given IP address. `addr' is in network byte order.
1430 * Return value is 1 if yes, 0 if no, -1 if don't know.
1431 * For demand mode to work properly, we have to ignore routes
1432 * through our own interface.
1434 int have_route_to(u_int32_t addr)
1439 if (!open_route_table())
1440 return -1; /* don't know */
1442 while (read_route_table(&rt)) {
1443 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1445 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) {
1451 close_route_table();
1455 /********************************************************************
1457 * sifdefaultroute - assign a default route through the address given.
1460 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1464 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1465 u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway);
1467 if (old_gateway != gateway)
1468 error("not replacing existing default route to %s [%I]",
1469 rt.rt_dev, old_gateway);
1473 memset (&rt, '\0', sizeof (rt));
1474 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1475 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1477 if (kernel_version > KVERSION(2,1,0)) {
1478 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1479 SIN_ADDR(rt.rt_genmask) = 0L;
1482 SIN_ADDR(rt.rt_gateway) = gateway;
1484 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1485 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1486 if ( ! ok_error ( errno ))
1487 error("default route ioctl(SIOCADDRT): %m(%d)", errno);
1491 default_route_gateway = gateway;
1495 /********************************************************************
1497 * cifdefaultroute - delete a default route through the address given.
1500 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1504 default_route_gateway = 0;
1506 memset (&rt, '\0', sizeof (rt));
1507 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1508 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1510 if (kernel_version > KVERSION(2,1,0)) {
1511 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1512 SIN_ADDR(rt.rt_genmask) = 0L;
1515 SIN_ADDR(rt.rt_gateway) = gateway;
1517 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1518 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1520 if ( ! ok_error ( errno ))
1521 error("default route ioctl(SIOCDELRT): %m (%d)", errno);
1529 /********************************************************************
1531 * sifproxyarp - Make a proxy ARP entry for the peer.
1534 int sifproxyarp (int unit, u_int32_t his_adr)
1536 struct arpreq arpreq;
1539 if (has_proxy_arp == 0) {
1540 memset (&arpreq, '\0', sizeof(arpreq));
1542 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1543 SIN_ADDR(arpreq.arp_pa) = his_adr;
1544 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1546 * Get the hardware address of an interface on the same subnet
1547 * as our local address.
1549 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1550 sizeof(proxy_arp_dev))) {
1551 error("Cannot determine ethernet address for proxy ARP");
1554 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1556 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1557 if ( ! ok_error ( errno ))
1558 error("ioctl(SIOCSARP): %m(%d)", errno);
1561 proxy_arp_addr = his_adr;
1565 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward");
1566 if (forw_path != 0) {
1567 int fd = open(forw_path, O_WRONLY);
1569 if (write(fd, "1", 1) != 1)
1570 error("Couldn't enable IP forwarding: %m");
1580 /********************************************************************
1582 * cifproxyarp - Delete the proxy ARP entry for the peer.
1585 int cifproxyarp (int unit, u_int32_t his_adr)
1587 struct arpreq arpreq;
1589 if (has_proxy_arp) {
1591 memset (&arpreq, '\0', sizeof(arpreq));
1592 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1593 SIN_ADDR(arpreq.arp_pa) = his_adr;
1594 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1595 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1597 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1598 if ( ! ok_error ( errno ))
1599 warn("ioctl(SIOCDARP): %m(%d)", errno);
1606 /********************************************************************
1608 * get_ether_addr - get the hardware address of an interface on the
1609 * the same subnet as ipaddr.
1612 static int get_ether_addr (u_int32_t ipaddr,
1613 struct sockaddr *hwaddr,
1614 char *name, int namelen)
1616 struct ifreq *ifr, *ifend;
1617 u_int32_t ina, mask;
1621 struct ifreq ifs[MAX_IFS];
1623 ifc.ifc_len = sizeof(ifs);
1625 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1626 if ( ! ok_error ( errno ))
1627 error("ioctl(SIOCGIFCONF): %m(%d)", errno);
1631 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1632 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1634 * Scan through looking for an interface with an Internet
1635 * address on the same subnet as `ipaddr'.
1637 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1638 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1639 if (ifr->ifr_addr.sa_family == AF_INET) {
1640 ina = SIN_ADDR(ifr->ifr_addr);
1641 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1642 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1645 * Check that the interface is up, and not point-to-point
1648 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1651 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1654 * Get its netmask and check that it's on the right subnet.
1656 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1659 mask = SIN_ADDR(ifreq.ifr_addr);
1660 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1661 ip_ntoa(ina), ntohl(mask)));
1663 if (((ipaddr ^ ina) & mask) != 0)
1672 strlcpy(name, ifreq.ifr_name, namelen);
1674 /* trim off the :1 in eth0:1 */
1675 aliasp = strchr(name, ':');
1679 info("found interface %s for proxy arp", name);
1681 * Now get the hardware address.
1683 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1684 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) {
1685 error("SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno);
1691 sizeof (struct sockaddr));
1693 SYSDEBUG ((LOG_DEBUG,
1694 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1695 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1696 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1697 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1698 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1699 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1700 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1701 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1702 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1707 * get_if_hwaddr - get the hardware address for the specified
1708 * network interface device.
1711 get_if_hwaddr(u_char *addr, char *name)
1716 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
1719 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
1720 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
1721 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
1724 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
1729 * get_first_ethernet - return the name of the first ethernet-style
1730 * interface on this system.
1733 get_first_ethernet()
1738 /********************************************************************
1740 * Return user specified netmask, modified by any mask we might determine
1741 * for address `addr' (in network byte order).
1742 * Here we scan through the system's list of interfaces, looking for
1743 * any non-point-to-point interfaces which might appear to be on the same
1744 * network as `addr'. If we find any, we OR in their netmask to the
1745 * user-specified netmask.
1748 u_int32_t GetMask (u_int32_t addr)
1750 u_int32_t mask, nmask, ina;
1751 struct ifreq *ifr, *ifend, ifreq;
1753 struct ifreq ifs[MAX_IFS];
1757 if (IN_CLASSA(addr)) /* determine network mask for address class */
1758 nmask = IN_CLASSA_NET;
1759 else if (IN_CLASSB(addr))
1760 nmask = IN_CLASSB_NET;
1762 nmask = IN_CLASSC_NET;
1764 /* class D nets are disallowed by bad_ip_adrs */
1765 mask = netmask | htonl(nmask);
1767 * Scan through the system's network interfaces.
1769 ifc.ifc_len = sizeof(ifs);
1771 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1772 if ( ! ok_error ( errno ))
1773 warn("ioctl(SIOCGIFCONF): %m(%d)", errno);
1777 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1778 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1780 * Check the interface's internet address.
1782 if (ifr->ifr_addr.sa_family != AF_INET)
1784 ina = SIN_ADDR(ifr->ifr_addr);
1785 if (((ntohl(ina) ^ addr) & nmask) != 0)
1788 * Check that the interface is up, and not point-to-point nor loopback.
1790 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1791 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1794 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1797 * Get its netmask and OR it into our mask.
1799 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1801 mask |= SIN_ADDR(ifreq.ifr_addr);
1807 /********************************************************************
1809 * Internal routine to decode the version.modification.patch level
1812 static void decode_version (char *buf, int *version,
1813 int *modification, int *patch)
1817 *version = (int) strtoul (buf, &endp, 10);
1821 if (endp != buf && *endp == '.') {
1823 *modification = (int) strtoul (buf, &endp, 10);
1824 if (endp != buf && *endp == '.') {
1826 *patch = (int) strtoul (buf, &buf, 10);
1831 /********************************************************************
1833 * Procedure to determine if the PPP line discipline is registered.
1837 ppp_registered(void)
1845 * We used to open the serial device and set it to the ppp line
1846 * discipline here, in order to create a ppp unit. But that is
1847 * not a good idea - the user might have specified a device that
1848 * they can't open (permission, or maybe it doesn't really exist).
1849 * So we grab a pty master/slave pair and use that.
1851 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1852 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1857 * Try to put the device into the PPP discipline.
1859 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1860 error("ioctl(TIOCSETD(PPP)): %m(%d)", errno);
1869 /********************************************************************
1871 * ppp_available - check whether the system has any ppp interfaces
1872 * (in fact we check whether we can do an ioctl on ppp0).
1875 int ppp_available(void)
1880 int my_version, my_modification, my_patch;
1881 int osmaj, osmin, ospatch;
1884 "This system lacks kernel support for PPP. This could be because\n"
1885 "the PPP kernel module could not be loaded, or because PPP was not\n"
1886 "included in the kernel configuration. If PPP was included as a\n"
1887 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
1888 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
1889 "See README.linux file in the ppp distribution for more details.\n";
1891 /* get the kernel version now, since we are called before sys_init */
1893 osmaj = osmin = ospatch = 0;
1894 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
1895 kernel_version = KVERSION(osmaj, osmin, ospatch);
1897 fd = open("/dev/ppp", O_RDWR);
1899 if (fd < 0 && errno == ENOENT) {
1900 /* try making it and see if that helps. */
1901 if (mknod("/dev/ppp", S_IFCHR | S_IRUSR | S_IWUSR,
1902 makedev(108, 0)) >= 0) {
1903 fd = open("/dev/ppp", O_RDWR);
1905 info("Created /dev/ppp device node");
1907 unlink("/dev/ppp"); /* didn't work, undo the mknod */
1908 } else if (errno == EEXIST) {
1909 fd = open("/dev/ppp", O_RDWR);
1914 new_style_driver = 1;
1916 /* XXX should get from driver */
1918 driver_modification = 4;
1923 if (kernel_version >= KVERSION(2,3,13))
1927 * Open a socket for doing the ioctl operations.
1929 s = socket(AF_INET, SOCK_DGRAM, 0);
1933 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1934 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1936 * If the device did not exist then attempt to create one by putting the
1937 * current tty into the PPP discipline. If this works then obtain the
1938 * flags for the device again.
1941 if (ppp_registered()) {
1942 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1943 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1947 * Ensure that the hardware address is for PPP and not something else
1950 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1952 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1956 * This is the PPP device. Validate the version of the driver at this
1957 * point to ensure that this program will work with the driver.
1960 char abBuffer [1024];
1962 ifr.ifr_data = abBuffer;
1963 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1965 error("Couldn't read driver version: %m");
1967 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
1970 decode_version(abBuffer,
1972 &driver_modification,
1975 * Validate the version of the driver against the version that we used.
1977 decode_version(VERSION,
1982 /* The version numbers must match */
1983 if (driver_version != my_version)
1986 /* The modification levels must be legal */
1987 if (driver_modification < 3) {
1988 if (driver_modification >= 2) {
1989 /* we can cope with 2.2.0 and above */
1998 slprintf(route_buffer, sizeof(route_buffer),
1999 "Sorry - PPP driver version %d.%d.%d is out of date\n",
2000 driver_version, driver_modification, driver_patch);
2002 no_ppp_msg = route_buffer;
2009 /********************************************************************
2011 * Update the wtmp file with the appropriate user name and tty device.
2014 void logwtmp (const char *line, const char *name, const char *host)
2016 struct utmp ut, *utp;
2017 pid_t mypid = getpid();
2023 * Update the signon database for users.
2024 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
2026 utmpname(_PATH_UTMP);
2028 while ((utp = getutent()) && (utp->ut_pid != mypid))
2031 /* Is this call really necessary? There is another one after the 'put' */
2035 memcpy(&ut, utp, sizeof(ut));
2037 /* some gettys/telnetds don't initialize utmp... */
2038 memset(&ut, 0, sizeof(ut));
2040 if (ut.ut_id[0] == 0)
2041 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
2043 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
2044 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
2048 ut.ut_type = USER_PROCESS;
2051 /* Insert the host name if one is supplied */
2053 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
2055 /* Insert the IP address of the remote system if IP is enabled */
2056 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
2057 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
2058 sizeof(ut.ut_addr));
2060 /* CL: Makes sure that the logout works */
2061 if (*host == 0 && *name==0)
2067 * Update the wtmp file.
2070 updwtmp(_PATH_WTMP, &ut);
2072 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
2074 flock(wtmp, LOCK_EX);
2076 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut))
2077 warn("error writing %s: %m", _PATH_WTMP);
2079 flock(wtmp, LOCK_UN);
2087 /********************************************************************
2089 * sifvjcomp - config tcp header compression
2092 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2094 u_int x = get_flags(ppp_dev_fd);
2097 if (ioctl (ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
2098 if (! ok_error (errno))
2099 error("ioctl(PPPIOCSMAXCID): %m(%d)", errno);
2104 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
2105 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
2106 set_flags (ppp_dev_fd, x);
2111 /********************************************************************
2113 * sifup - Config the interface up and enable IP packets to pass.
2120 memset (&ifr, '\0', sizeof (ifr));
2121 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2122 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2123 if (! ok_error (errno))
2124 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
2128 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2129 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2130 if (! ok_error (errno))
2131 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
2139 /********************************************************************
2141 * sifdown - Disable the indicated protocol and config the interface
2142 * down if there are no remaining protocols.
2149 if (if_is_up && --if_is_up > 0)
2152 memset (&ifr, '\0', sizeof (ifr));
2153 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2154 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
2155 if (! ok_error (errno))
2156 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
2160 ifr.ifr_flags &= ~IFF_UP;
2161 ifr.ifr_flags |= IFF_POINTOPOINT;
2162 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
2163 if (! ok_error (errno))
2164 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
2170 /********************************************************************
2172 * sifaddr - Config the interface IP addresses and netmask.
2175 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2181 memset (&ifr, '\0', sizeof (ifr));
2182 memset (&rt, '\0', sizeof (rt));
2184 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2185 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2186 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2188 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2190 * Set our IP address
2192 SIN_ADDR(ifr.ifr_addr) = our_adr;
2193 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2194 if (errno != EEXIST) {
2195 if (! ok_error (errno))
2196 error("ioctl(SIOCSIFADDR): %m(%d)", errno);
2199 warn("ioctl(SIOCSIFADDR): Address already exists");
2204 * Set the gateway address
2206 SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
2207 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2208 if (! ok_error (errno))
2209 error("ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
2214 * For recent kernels, force the netmask to 255.255.255.255.
2216 if (kernel_version >= KVERSION(2,1,16))
2218 if (net_mask != 0) {
2219 SIN_ADDR(ifr.ifr_netmask) = net_mask;
2220 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2221 if (! ok_error (errno))
2222 error("ioctl(SIOCSIFNETMASK): %m(%d)", errno);
2227 * Add the device route
2229 if (kernel_version < KVERSION(2,1,16)) {
2230 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2231 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2234 SIN_ADDR(rt.rt_gateway) = 0L;
2235 SIN_ADDR(rt.rt_dst) = his_adr;
2236 rt.rt_flags = RTF_UP | RTF_HOST;
2238 if (kernel_version > KVERSION(2,1,0)) {
2239 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2240 SIN_ADDR(rt.rt_genmask) = -1L;
2243 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2244 if (! ok_error (errno))
2245 error("ioctl(SIOCADDRT) device route: %m(%d)", errno);
2250 /* set ip_dynaddr in demand mode if address changes */
2251 if (demand && tune_kernel && !dynaddr_set
2252 && our_old_addr && our_old_addr != our_adr) {
2253 /* set ip_dynaddr if possible */
2257 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
2258 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
2259 if (write(fd, "1", 1) != 1)
2260 error("Couldn't enable dynamic IP addressing: %m");
2263 dynaddr_set = 1; /* only 1 attempt */
2270 /********************************************************************
2272 * cifaddr - Clear the interface IP addresses, and delete routes
2273 * through the interface if possible.
2276 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2280 if (kernel_version < KVERSION(2,1,16)) {
2282 * Delete the route through the device
2285 memset (&rt, '\0', sizeof (rt));
2287 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2288 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2291 SIN_ADDR(rt.rt_gateway) = 0;
2292 SIN_ADDR(rt.rt_dst) = his_adr;
2293 rt.rt_flags = RTF_UP | RTF_HOST;
2295 if (kernel_version > KVERSION(2,1,0)) {
2296 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2297 SIN_ADDR(rt.rt_genmask) = -1L;
2300 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2301 if (still_ppp() && ! ok_error (errno))
2302 error("ioctl(SIOCDELRT) device route: %m(%d)", errno);
2307 /* This way it is possible to have an IPX-only or IPv6-only interface */
2308 memset(&ifr, 0, sizeof(ifr));
2309 SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
2310 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2312 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2313 if (! ok_error (errno)) {
2314 error("ioctl(SIOCSIFADDR): %m(%d)", errno);
2319 our_old_addr = our_adr;
2325 /********************************************************************
2327 * sif6addr - Config the interface with an IPv6 link-local address
2329 int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2331 struct in6_ifreq ifr6;
2333 struct in6_rtmsg rt6;
2337 error("IPv6 socket creation failed: %m");
2340 memset(&ifr, 0, sizeof (ifr));
2341 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2342 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2343 error("sif6addr: ioctl(SIOCGIFINDEX): %m (%d)", errno);
2347 /* Local interface */
2348 memset(&ifr6, 0, sizeof(ifr6));
2349 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2350 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2351 ifr6.ifr6_prefixlen = 10;
2353 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
2354 error("sif6addr: ioctl(SIOCSIFADDR): %m (%d)", errno);
2358 /* Route to remote host */
2359 memset(&rt6, 0, sizeof(rt6));
2360 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
2361 rt6.rtmsg_flags = RTF_UP;
2362 rt6.rtmsg_dst_len = 10;
2363 rt6.rtmsg_ifindex = ifr.ifr_ifindex;
2364 rt6.rtmsg_metric = 1;
2366 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
2367 error("sif6addr: ioctl(SIOCADDRT): %m (%d)", errno);
2375 /********************************************************************
2377 * cif6addr - Remove IPv6 address from interface
2379 int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
2382 struct in6_ifreq ifr6;
2386 error("IPv6 socket creation failed: %m");
2389 memset(&ifr, 0, sizeof(ifr));
2390 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2391 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) {
2392 error("cif6addr: ioctl(SIOCGIFINDEX): %m (%d)", errno);
2396 memset(&ifr6, 0, sizeof(ifr6));
2397 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
2398 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
2399 ifr6.ifr6_prefixlen = 10;
2401 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
2402 if (errno != EADDRNOTAVAIL) {
2403 if (! ok_error (errno))
2404 error("cif6addr: ioctl(SIOCDIFADDR): %m (%d)", errno);
2407 warn("cif6addr: ioctl(SIOCDIFADDR): No such address");
2416 * get_pty - get a pty master/slave pair and chown the slave side
2417 * to the uid given. Assumes slave_name points to >= 16 bytes of space.
2420 get_pty(master_fdp, slave_fdp, slave_name, uid)
2426 int i, mfd, sfd = -1;
2428 struct termios tios;
2432 * Try the unix98 way first.
2434 mfd = open("/dev/ptmx", O_RDWR);
2437 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) {
2438 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn);
2439 chmod(pty_name, S_IRUSR | S_IWUSR);
2442 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0)
2443 warn("Couldn't unlock pty slave %s: %m", pty_name);
2445 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0)
2446 warn("Couldn't open pty slave %s: %m", pty_name);
2449 #endif /* TIOCGPTN */
2452 /* the old way - scan through the pty name space */
2453 for (i = 0; i < 64; ++i) {
2454 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2455 'p' + i / 16, i % 16);
2456 mfd = open(pty_name, O_RDWR, 0);
2459 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2461 fchown(sfd, uid, -1);
2462 fchmod(sfd, S_IRUSR | S_IWUSR);
2473 strlcpy(slave_name, pty_name, 16);
2476 if (tcgetattr(sfd, &tios) == 0) {
2477 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2478 tios.c_cflag |= CS8 | CREAD | CLOCAL;
2479 tios.c_iflag = IGNPAR;
2482 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2483 warn("couldn't set attributes on pty: %m");
2485 warn("couldn't get attributes on pty: %m");
2490 /********************************************************************
2492 * open_loopback - open the device we use for getting packets
2493 * in demand mode. Under Linux, we use a pty master/slave pair.
2496 open_ppp_loopback(void)
2501 if (new_style_driver) {
2502 /* allocate ourselves a ppp unit */
2503 if (make_ppp_unit() < 0)
2505 set_flags(ppp_dev_fd, SC_LOOP_TRAFFIC);
2506 set_kdebugflag(kdebugflag);
2511 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2512 fatal("No free pty for loopback");
2513 SYSDEBUG(("using %s for loopback", loop_name));
2515 set_ppp_fd(slave_fd);
2517 flags = fcntl(master_fd, F_GETFL);
2519 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2520 warn("couldn't set master loopback to nonblock: %m(%d)", errno);
2522 flags = fcntl(ppp_fd, F_GETFL);
2524 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2525 warn("couldn't set slave loopback to nonblock: %m(%d)", errno);
2527 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2528 fatal("ioctl(TIOCSETD): %m(%d)", errno);
2530 * Find out which interface we were given.
2532 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2533 fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
2535 * Enable debug in the driver if requested.
2537 set_kdebugflag (kdebugflag);
2542 /********************************************************************
2544 * restore_loop - reattach the ppp unit to the loopback.
2546 * The kernel ppp driver automatically reattaches the ppp unit to
2547 * the loopback if the serial port is set to a line discipline other
2548 * than ppp, or if it detects a modem hangup. The former will happen
2549 * in disestablish_ppp if the latter hasn't already happened, so we
2550 * shouldn't need to do anything.
2552 * Just to be sure, set the real serial port to the normal discipline.
2559 if (new_style_driver) {
2560 set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_LOOP_TRAFFIC);
2563 if (ppp_fd != slave_fd) {
2564 (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
2565 set_ppp_fd(slave_fd);
2569 /********************************************************************
2571 * sifnpmode - Set the mode for handling packets for a given NP.
2575 sifnpmode(u, proto, mode)
2582 npi.protocol = proto;
2584 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2585 if (! ok_error (errno))
2586 error("ioctl(PPPIOCSNPMODE, %d, %d): %m (%d)",
2587 proto, mode, errno);
2594 /********************************************************************
2596 * sipxfaddr - Config the interface IPX networknumber
2599 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2606 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2608 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2610 if (! ok_error (errno))
2611 dbglog("socket(AF_IPX): %m (%d)", errno);
2615 memset (&ifr, '\0', sizeof (ifr));
2616 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2618 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2619 sipx->sipx_family = AF_IPX;
2620 sipx->sipx_port = 0;
2621 sipx->sipx_network = htonl (network);
2622 sipx->sipx_type = IPX_FRAME_ETHERII;
2623 sipx->sipx_action = IPX_CRTITF;
2625 * Set the IPX device
2627 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2629 if (errno != EEXIST) {
2630 if (! ok_error (errno))
2631 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (%d)", errno);
2634 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2643 /********************************************************************
2645 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2646 * are removed and the device is no longer able to pass IPX
2650 int cipxfaddr (int unit)
2657 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2659 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2661 if (! ok_error (errno))
2662 dbglog("socket(AF_IPX): %m (%d)", errno);
2666 memset (&ifr, '\0', sizeof (ifr));
2667 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2669 sipx->sipx_type = IPX_FRAME_ETHERII;
2670 sipx->sipx_action = IPX_DLTITF;
2671 sipx->sipx_family = AF_IPX;
2673 * Set the IPX device
2675 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2676 if (! ok_error (errno))
2677 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (%d)", errno);
2687 * Use the hostname as part of the random number seed.
2696 for (p = hostname; *p != 0; ++p)
2701 /********************************************************************
2703 * sys_check_options - check the options that the user specified
2707 sys_check_options(void)
2711 * Disable the IPX protocol if the support is not present in the kernel.
2715 if (ipxcp_protent.enabled_flag) {
2716 struct stat stat_buf;
2717 if ((path = path_to_procfs("/net/ipx_interface")) == 0
2718 || lstat(path, &stat_buf) < 0) {
2719 error("IPX support is not present in the kernel\n");
2720 ipxcp_protent.enabled_flag = 0;
2724 if (demand && driver_is_old) {
2725 option_error("demand dialling is not supported by kernel driver "
2726 "version %d.%d.%d", driver_version, driver_modification,
2730 if (multilink && !new_style_driver) {
2731 warn("Warning: multilink is not supported by the kernel driver");