2 * sys-bsd.c - System-dependent procedures for setting up
3 * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
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.
22 static char rcsid[] = "$Id: sys-bsd.c,v 1.10 1994/09/01 00:36:39 paulus Exp $";
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
35 #include <sys/errno.h>
38 #include <net/if_ppp.h>
39 #include <net/route.h>
40 #include <net/if_dl.h>
41 #include <netinet/in.h>
44 #include <netinet/if_ether.h>
50 static int initdisc = -1; /* Initial TTY discipline */
53 static int restore_term; /* 1 => we've munged the terminal */
54 static struct termios inittermios; /* Initial TTY termios */
57 * sys_init - System-dependent initialization.
62 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
63 setlogmask(LOG_UPTO(LOG_INFO));
65 setlogmask(LOG_UPTO(LOG_DEBUG));
69 * note_debug_level - note a change in the debug level.
75 syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
76 setlogmask(LOG_UPTO(LOG_DEBUG));
78 setlogmask(LOG_UPTO(LOG_WARNING));
83 * establish_ppp - Turn the serial port into a ppp interface.
88 int pppdisc = PPPDISC;
91 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
92 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
95 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
96 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
101 * Find out which interface we were given.
103 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
104 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
109 * Enable debug in the driver if requested.
112 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
113 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
115 x |= (kdebugflag & 0xFF) * SC_DEBUG;
116 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
117 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
124 * disestablish_ppp - Restore the serial port to normal operation.
125 * This shouldn't call die() because it's called from die().
135 * Check whether the link seems not to be 8-bit clean.
137 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
139 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
141 s = "bit 7 set to 1";
144 s = "bit 7 set to 0";
154 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
155 syslog(LOG_WARNING, "All received characters had %s", s);
158 if (ioctl(fd, TIOCSETD, &initdisc) < 0)
159 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
165 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
166 * at the requested speed, etc. If `local' is true, set CLOCAL
167 * regardless of whether the modem option was specified.
169 * For *BSD, we assume that speed_t values numerically equal bits/second.
171 set_up_tty(fd, local)
176 if (tcgetattr(fd, &tios) < 0) {
177 syslog(LOG_ERR, "tcgetattr: %m");
184 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL | CRTSCTS);
186 tios.c_cflag |= CRTSCTS;
188 tios.c_cflag |= CS8 | CREAD | HUPCL;
190 tios.c_cflag |= CLOCAL;
191 tios.c_iflag = IGNBRK | IGNPAR;
195 tios.c_cc[VTIME] = 0;
198 tios.c_iflag |= IXOFF;
199 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
200 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
204 cfsetospeed(&tios, inspeed);
205 cfsetispeed(&tios, inspeed);
207 inspeed = cfgetospeed(&tios);
209 * We can't proceed if the serial port speed is 0,
210 * since that implies that the serial port is disabled.
213 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
220 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
221 syslog(LOG_ERR, "tcsetattr: %m");
229 * restore_tty - restore the terminal to the saved settings.
235 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
237 syslog(LOG_WARNING, "tcsetattr: %m");
243 * setdtr - control the DTR line on the serial port.
244 * This is called from die(), so it shouldn't call die().
249 int modembits = TIOCM_DTR;
251 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
256 * output - Output PPP packet.
265 MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
267 log_packet(p, len, "sent ");
269 if (write(fd, p, len) < 0) {
270 syslog(LOG_ERR, "write: %m");
277 * wait_input - wait until there is data available on fd,
278 * for the length of time specified by *timo (indefinite
282 struct timeval *timo;
289 n = select(fd+1, &ready, NULL, &ready, timo);
290 if (n < 0 && errno != EINTR) {
291 syslog(LOG_ERR, "select: %m");
298 * read_packet - get a PPP packet from the serial device.
306 if ((len = read(fd, buf, MTU + DLLHEADERLEN)) < 0) {
307 if (errno == EWOULDBLOCK) {
308 MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
311 syslog(LOG_ERR, "read(fd): %m");
319 * ppp_send_config - configure the transmit characteristics of
323 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
331 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
333 if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
334 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
338 if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
339 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
343 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
344 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
347 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
348 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
349 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
350 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
357 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
360 ppp_set_xaccm(unit, accm)
364 if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
365 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
370 * ppp_recv_config - configure the receive-side characteristics of
374 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
381 if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
382 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
385 if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
386 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
389 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
390 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
393 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
394 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
395 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
401 * ccp_test - ask kernel whether a given compression method
402 * is acceptable for use.
404 ccp_test(unit, opt_ptr, opt_len, for_transmit)
405 int unit, opt_len, for_transmit;
408 struct ppp_comp_data data;
411 data.length = opt_len;
412 data.transmit = for_transmit;
413 return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0;
417 * ccp_flags_set - inform kernel about the current state of CCP.
420 ccp_flags_set(unit, isopen, isup)
421 int unit, isopen, isup;
425 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
426 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
429 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
430 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
431 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
432 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
436 * sifvjcomp - config tcp header compression
439 sifvjcomp(u, vjcomp, cidcomp, maxcid)
440 int u, vjcomp, cidcomp, maxcid;
444 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
445 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
448 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
449 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
450 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
451 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
454 if (ioctl(fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
455 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
462 * sifup - Config the interface up and enable IP packets to pass.
471 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
472 if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
473 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
476 ifr.ifr_flags |= IFF_UP;
477 if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
478 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
481 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
482 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
486 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
487 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
494 * sifdown - Config the interface down and disable IP.
505 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
506 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
510 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
511 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
515 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
516 if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
517 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
520 ifr.ifr_flags &= ~IFF_UP;
521 if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
522 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
530 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
533 #define SET_SA_FAMILY(addr, family) \
534 BZERO((char *) &(addr), sizeof(addr)); \
535 addr.sa_family = (family); \
536 addr.sa_len = sizeof(addr);
539 * sifaddr - Config the interface IP addresses and netmask.
546 struct ifaliasreq ifra;
548 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
549 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
550 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
551 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
552 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
554 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
555 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
557 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
558 if (ioctl(s, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
559 if (errno != EEXIST) {
560 syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
563 syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
569 * cifaddr - Clear the interface IP addresses, and delete routes
570 * through the interface if possible.
577 struct ifaliasreq ifra;
579 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
580 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
581 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
582 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
583 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
584 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
585 if (ioctl(s, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
586 syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m");
593 * sifdefaultroute - assign a default route through the address given.
596 sifdefaultroute(u, g)
600 return dodefaultroute(g, 's');
604 * cifdefaultroute - delete a default route through the address given.
607 cifdefaultroute(u, g)
611 return dodefaultroute(g, 'c');
615 * dodefaultroute - talk to a routing socket to add/delete a default route.
618 dodefaultroute(g, cmd)
624 struct rt_msghdr hdr;
625 struct sockaddr_in dst;
626 struct sockaddr_in gway;
627 struct sockaddr_in mask;
630 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
631 syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd);
635 memset(&rtmsg, 0, sizeof(rtmsg));
636 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
637 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
638 rtmsg.hdr.rtm_version = RTM_VERSION;
639 rtmsg.hdr.rtm_seq = ++rtm_seq;
640 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
641 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
642 rtmsg.dst.sin_family = AF_INET;
643 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
644 rtmsg.gway.sin_family = AF_INET;
645 rtmsg.gway.sin_addr.s_addr = g;
646 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
647 rtmsg.mask.sin_family = AF_INET;
649 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
650 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
651 syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete");
663 * sifproxyarp - Make a proxy ARP entry for the peer.
666 struct rt_msghdr hdr;
667 struct sockaddr_inarp dst;
668 struct sockaddr_dl hwa;
672 static int arpmsg_valid;
675 sifproxyarp(unit, hisaddr)
683 * Get the hardware address of an interface on the same subnet
684 * as our local address.
686 memset(&arpmsg, 0, sizeof(arpmsg));
687 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
688 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
692 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
693 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
697 arpmsg.hdr.rtm_type = RTM_ADD;
698 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
699 arpmsg.hdr.rtm_version = RTM_VERSION;
700 arpmsg.hdr.rtm_seq = ++rtm_seq;
701 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
702 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
703 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
704 arpmsg.dst.sin_family = AF_INET;
705 arpmsg.dst.sin_addr.s_addr = hisaddr;
706 arpmsg.dst.sin_other = SIN_PROXY;
708 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
709 + arpmsg.hwa.sdl_len;
710 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
711 syslog(LOG_ERR, "add proxy arp entry: %m");
722 * cifproxyarp - Delete the proxy ARP entry for the peer.
725 cifproxyarp(unit, hisaddr)
735 arpmsg.hdr.rtm_type = RTM_DELETE;
736 arpmsg.hdr.rtm_seq = ++rtm_seq;
738 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
739 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
743 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
744 syslog(LOG_ERR, "delete proxy arp entry: %m");
753 #else /* RTM_VERSION */
756 * sifproxyarp - Make a proxy ARP entry for the peer.
759 sifproxyarp(unit, hisaddr)
763 struct arpreq arpreq;
765 struct sockaddr_dl sdl;
769 BZERO(&arpreq, sizeof(arpreq));
772 * Get the hardware address of an interface on the same subnet
773 * as our local address.
775 if (!get_ether_addr(hisaddr, &dls.sdl)) {
776 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
780 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
781 arpreq.arp_ha.sa_family = AF_UNSPEC;
782 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
783 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
784 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
785 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
786 if (ioctl(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
787 syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
795 * cifproxyarp - Delete the proxy ARP entry for the peer.
798 cifproxyarp(unit, hisaddr)
802 struct arpreq arpreq;
804 BZERO(&arpreq, sizeof(arpreq));
805 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
806 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
807 if (ioctl(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
808 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
813 #endif /* RTM_VERSION */
817 * get_ether_addr - get the hardware address of an interface on the
818 * the same subnet as ipaddr.
823 get_ether_addr(ipaddr, hwaddr)
825 struct sockaddr_dl *hwaddr;
827 struct ifreq *ifr, *ifend, *ifp;
829 struct sockaddr_dl *dla;
832 struct ifreq ifs[MAX_IFS];
834 ifc.ifc_len = sizeof(ifs);
836 if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
837 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
842 * Scan through looking for an interface with an Internet
843 * address on the same subnet as `ipaddr'.
845 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
846 for (ifr = ifc.ifc_req; ifr < ifend; ) {
847 if (ifr->ifr_addr.sa_family == AF_INET) {
848 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
849 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
851 * Check that the interface is up, and not point-to-point
854 if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
856 if ((ifreq.ifr_flags &
857 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
858 != (IFF_UP|IFF_BROADCAST))
861 * Get its netmask and check that it's on the right subnet.
863 if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
865 mask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
866 if ((ipaddr & mask) != (ina & mask))
871 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
876 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
879 * Now scan through again looking for a link-level address
880 * for this interface.
883 for (ifr = ifc.ifc_req; ifr < ifend; ) {
884 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
885 && ifr->ifr_addr.sa_family == AF_LINK) {
887 * Found the link-level address - copy it out
889 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
890 BCOPY(dla, hwaddr, dla->sdl_len);
893 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
901 * ppp_available - check whether the system has any ppp interfaces
902 * (in fact we check whether we can do an ioctl on ppp0).
910 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
911 return 1; /* can't tell - maybe we're not root */
913 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
914 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;