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 1.13 1994/09/21 06:47:37 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/ppp_defs.h>
39 #include <net/if_ppp.h>
40 #include <net/route.h>
41 #include <net/if_dl.h>
42 #include <netinet/in.h>
45 #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 * ppp_available - check whether the system has any ppp interfaces
84 * (in fact we check whether we can do an ioctl on ppp0).
92 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
93 return 1; /* can't tell - maybe we're not root */
95 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
96 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
103 * establish_ppp - Turn the serial port into a ppp interface.
108 int pppdisc = PPPDISC;
111 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
112 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
115 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
116 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
121 * Find out which interface we were given.
123 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
124 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
129 * Enable debug in the driver if requested.
132 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
133 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
135 x |= (kdebugflag & 0xFF) * SC_DEBUG;
136 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
137 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
144 * disestablish_ppp - Restore the serial port to normal operation.
145 * This shouldn't call die() because it's called from die().
155 * Check whether the link seems not to be 8-bit clean.
157 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
159 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
161 s = "bit 7 set to 1";
164 s = "bit 7 set to 0";
174 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
175 syslog(LOG_WARNING, "All received characters had %s", s);
178 if (ioctl(fd, TIOCSETD, &initdisc) < 0)
179 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
185 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
186 * at the requested speed, etc. If `local' is true, set CLOCAL
187 * regardless of whether the modem option was specified.
189 * For *BSD, we assume that speed_t values numerically equal bits/second.
191 set_up_tty(fd, local)
196 if (tcgetattr(fd, &tios) < 0) {
197 syslog(LOG_ERR, "tcgetattr: %m");
204 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
206 tios.c_cflag |= CRTSCTS;
207 else if (crtscts < 0)
208 tios.c_cflag &= ~CRTSCTS;
210 tios.c_cflag |= CS8 | CREAD | HUPCL;
212 tios.c_cflag |= CLOCAL;
213 tios.c_iflag = IGNBRK | IGNPAR;
217 tios.c_cc[VTIME] = 0;
220 tios.c_iflag |= IXOFF;
221 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
222 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
226 cfsetospeed(&tios, inspeed);
227 cfsetispeed(&tios, inspeed);
229 inspeed = cfgetospeed(&tios);
231 * We can't proceed if the serial port speed is 0,
232 * since that implies that the serial port is disabled.
235 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
242 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
243 syslog(LOG_ERR, "tcsetattr: %m");
251 * restore_tty - restore the terminal to the saved settings.
257 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
259 syslog(LOG_WARNING, "tcsetattr: %m");
265 * setdtr - control the DTR line on the serial port.
266 * This is called from die(), so it shouldn't call die().
271 int modembits = TIOCM_DTR;
273 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
278 * output - Output PPP packet.
287 MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
289 log_packet(p, len, "sent ");
291 if (write(fd, p, len) < 0) {
292 syslog(LOG_ERR, "write: %m");
299 * wait_input - wait until there is data available on fd,
300 * for the length of time specified by *timo (indefinite
304 struct timeval *timo;
311 n = select(fd+1, &ready, NULL, &ready, timo);
312 if (n < 0 && errno != EINTR) {
313 syslog(LOG_ERR, "select: %m");
320 * read_packet - get a PPP packet from the serial device.
328 if ((len = read(fd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
329 if (errno == EWOULDBLOCK) {
330 MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
333 syslog(LOG_ERR, "read(fd): %m");
341 * ppp_send_config - configure the transmit characteristics of
345 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
353 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
355 if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
356 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
360 if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
361 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
365 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
366 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
369 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
370 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
371 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
372 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
379 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
382 ppp_set_xaccm(unit, accm)
386 if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
387 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
392 * ppp_recv_config - configure the receive-side characteristics of
396 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
403 if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
404 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
407 if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
408 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
411 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
412 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
415 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
416 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
417 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
423 * ccp_test - ask kernel whether a given compression method
424 * is acceptable for use.
426 ccp_test(unit, opt_ptr, opt_len, for_transmit)
427 int unit, opt_len, for_transmit;
430 struct ppp_option_data data;
433 data.length = opt_len;
434 data.transmit = for_transmit;
435 return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0;
439 * ccp_flags_set - inform kernel about the current state of CCP.
442 ccp_flags_set(unit, isopen, isup)
443 int unit, isopen, isup;
447 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
448 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
451 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
452 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
453 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
454 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
458 * ccp_fatal_error - returns 1 if decompression was disabled as a
459 * result of an error detected after decompression of a packet,
460 * 0 otherwise. This is necessary because of patent nonsense.
463 ccp_fatal_error(unit)
468 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
469 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
472 return x & SC_DC_FERROR;
476 * sifvjcomp - config tcp header compression
479 sifvjcomp(u, vjcomp, cidcomp, maxcid)
480 int u, vjcomp, cidcomp, maxcid;
484 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
485 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
488 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
489 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
490 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
491 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
494 if (ioctl(fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
495 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
502 * sifup - Config the interface up and enable IP packets to pass.
512 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
513 if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
514 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
517 ifr.ifr_flags |= IFF_UP;
518 if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
519 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
522 npi.protocol = PPP_IP;
523 npi.mode = NPMODE_PASS;
524 if (ioctl(fd, PPPIOCSNPMODE, &npi) < 0) {
525 if (errno != ENOTTY) {
526 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
529 /* for backwards compatibility */
530 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
531 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
535 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
536 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
544 * sifdown - Config the interface down and disable IP.
556 npi.protocol = PPP_IP;
557 npi.mode = NPMODE_ERROR;
558 if (ioctl(fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
559 if (errno != ENOTTY) {
560 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
563 /* backwards compatibility */
564 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
565 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
569 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
570 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
577 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
578 if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
579 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
582 ifr.ifr_flags &= ~IFF_UP;
583 if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
584 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
592 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
595 #define SET_SA_FAMILY(addr, family) \
596 BZERO((char *) &(addr), sizeof(addr)); \
597 addr.sa_family = (family); \
598 addr.sa_len = sizeof(addr);
601 * sifaddr - Config the interface IP addresses and netmask.
608 struct ifaliasreq ifra;
610 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
611 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
612 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
613 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
614 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
616 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
617 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
619 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
620 if (ioctl(s, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
621 if (errno != EEXIST) {
622 syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
625 syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
631 * cifaddr - Clear the interface IP addresses, and delete routes
632 * through the interface if possible.
639 struct ifaliasreq ifra;
641 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
642 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
643 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
644 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
645 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
646 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
647 if (ioctl(s, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
648 syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m");
655 * sifdefaultroute - assign a default route through the address given.
658 sifdefaultroute(u, g)
662 return dodefaultroute(g, 's');
666 * cifdefaultroute - delete a default route through the address given.
669 cifdefaultroute(u, g)
673 return dodefaultroute(g, 'c');
677 * dodefaultroute - talk to a routing socket to add/delete a default route.
680 dodefaultroute(g, cmd)
686 struct rt_msghdr hdr;
687 struct sockaddr_in dst;
688 struct sockaddr_in gway;
689 struct sockaddr_in mask;
692 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
693 syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd);
697 memset(&rtmsg, 0, sizeof(rtmsg));
698 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
699 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
700 rtmsg.hdr.rtm_version = RTM_VERSION;
701 rtmsg.hdr.rtm_seq = ++rtm_seq;
702 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
703 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
704 rtmsg.dst.sin_family = AF_INET;
705 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
706 rtmsg.gway.sin_family = AF_INET;
707 rtmsg.gway.sin_addr.s_addr = g;
708 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
709 rtmsg.mask.sin_family = AF_INET;
711 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
712 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
713 syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete");
725 * sifproxyarp - Make a proxy ARP entry for the peer.
728 struct rt_msghdr hdr;
729 struct sockaddr_inarp dst;
730 struct sockaddr_dl hwa;
734 static int arpmsg_valid;
737 sifproxyarp(unit, hisaddr)
745 * Get the hardware address of an interface on the same subnet
746 * as our local address.
748 memset(&arpmsg, 0, sizeof(arpmsg));
749 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
750 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
754 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
755 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
759 arpmsg.hdr.rtm_type = RTM_ADD;
760 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
761 arpmsg.hdr.rtm_version = RTM_VERSION;
762 arpmsg.hdr.rtm_seq = ++rtm_seq;
763 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
764 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
765 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
766 arpmsg.dst.sin_family = AF_INET;
767 arpmsg.dst.sin_addr.s_addr = hisaddr;
768 arpmsg.dst.sin_other = SIN_PROXY;
770 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
771 + arpmsg.hwa.sdl_len;
772 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
773 syslog(LOG_ERR, "add proxy arp entry: %m");
784 * cifproxyarp - Delete the proxy ARP entry for the peer.
787 cifproxyarp(unit, hisaddr)
797 arpmsg.hdr.rtm_type = RTM_DELETE;
798 arpmsg.hdr.rtm_seq = ++rtm_seq;
800 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
801 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
805 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
806 syslog(LOG_ERR, "delete proxy arp entry: %m");
815 #else /* RTM_VERSION */
818 * sifproxyarp - Make a proxy ARP entry for the peer.
821 sifproxyarp(unit, hisaddr)
825 struct arpreq arpreq;
827 struct sockaddr_dl sdl;
831 BZERO(&arpreq, sizeof(arpreq));
834 * Get the hardware address of an interface on the same subnet
835 * as our local address.
837 if (!get_ether_addr(hisaddr, &dls.sdl)) {
838 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
842 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
843 arpreq.arp_ha.sa_family = AF_UNSPEC;
844 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
845 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
846 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
847 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
848 if (ioctl(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
849 syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
857 * cifproxyarp - Delete the proxy ARP entry for the peer.
860 cifproxyarp(unit, hisaddr)
864 struct arpreq arpreq;
866 BZERO(&arpreq, sizeof(arpreq));
867 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
868 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
869 if (ioctl(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
870 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
875 #endif /* RTM_VERSION */
879 * get_ether_addr - get the hardware address of an interface on the
880 * the same subnet as ipaddr.
885 get_ether_addr(ipaddr, hwaddr)
887 struct sockaddr_dl *hwaddr;
889 struct ifreq *ifr, *ifend, *ifp;
891 struct sockaddr_dl *dla;
894 struct ifreq ifs[MAX_IFS];
896 ifc.ifc_len = sizeof(ifs);
898 if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
899 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
904 * Scan through looking for an interface with an Internet
905 * address on the same subnet as `ipaddr'.
907 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
908 for (ifr = ifc.ifc_req; ifr < ifend; ) {
909 if (ifr->ifr_addr.sa_family == AF_INET) {
910 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
911 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
913 * Check that the interface is up, and not point-to-point
916 if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
918 if ((ifreq.ifr_flags &
919 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
920 != (IFF_UP|IFF_BROADCAST))
923 * Get its netmask and check that it's on the right subnet.
925 if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
927 mask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
928 if ((ipaddr & mask) != (ina & mask))
933 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
938 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
941 * Now scan through again looking for a link-level address
942 * for this interface.
945 for (ifr = ifc.ifc_req; ifr < ifend; ) {
946 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
947 && ifr->ifr_addr.sa_family == AF_LINK) {
949 * Found the link-level address - copy it out
951 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
952 BCOPY(dla, hwaddr, dla->sdl_len);
955 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);