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 1.11 1994/09/16 02:17:43 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 * 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 | CRTSCTS);
206 tios.c_cflag |= CRTSCTS;
208 tios.c_cflag |= CS8 | CREAD | HUPCL;
210 tios.c_cflag |= CLOCAL;
211 tios.c_iflag = IGNBRK | IGNPAR;
215 tios.c_cc[VTIME] = 0;
218 tios.c_iflag |= IXOFF;
219 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
220 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
224 cfsetospeed(&tios, inspeed);
225 cfsetispeed(&tios, inspeed);
227 inspeed = cfgetospeed(&tios);
229 * We can't proceed if the serial port speed is 0,
230 * since that implies that the serial port is disabled.
233 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
240 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
241 syslog(LOG_ERR, "tcsetattr: %m");
249 * restore_tty - restore the terminal to the saved settings.
255 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
257 syslog(LOG_WARNING, "tcsetattr: %m");
263 * setdtr - control the DTR line on the serial port.
264 * This is called from die(), so it shouldn't call die().
269 int modembits = TIOCM_DTR;
271 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
276 * output - Output PPP packet.
285 MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
287 log_packet(p, len, "sent ");
289 if (write(fd, p, len) < 0) {
290 syslog(LOG_ERR, "write: %m");
297 * wait_input - wait until there is data available on fd,
298 * for the length of time specified by *timo (indefinite
302 struct timeval *timo;
309 n = select(fd+1, &ready, NULL, &ready, timo);
310 if (n < 0 && errno != EINTR) {
311 syslog(LOG_ERR, "select: %m");
318 * read_packet - get a PPP packet from the serial device.
326 if ((len = read(fd, buf, MTU + DLLHEADERLEN)) < 0) {
327 if (errno == EWOULDBLOCK) {
328 MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
331 syslog(LOG_ERR, "read(fd): %m");
339 * ppp_send_config - configure the transmit characteristics of
343 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
351 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
353 if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
354 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
358 if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
359 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
363 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
364 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
367 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
368 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
369 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
370 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
377 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
380 ppp_set_xaccm(unit, accm)
384 if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
385 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
390 * ppp_recv_config - configure the receive-side characteristics of
394 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
401 if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
402 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
405 if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
406 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
409 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
410 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
413 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
414 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
415 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
421 * ccp_test - ask kernel whether a given compression method
422 * is acceptable for use.
424 ccp_test(unit, opt_ptr, opt_len, for_transmit)
425 int unit, opt_len, for_transmit;
428 struct ppp_option_data data;
431 data.length = opt_len;
432 data.transmit = for_transmit;
433 return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0;
437 * ccp_flags_set - inform kernel about the current state of CCP.
440 ccp_flags_set(unit, isopen, isup)
441 int unit, isopen, isup;
445 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
446 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
449 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
450 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
451 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
452 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
456 * ccp_fatal_error - returns 1 if decompression was disabled as a
457 * result of an error detected after decompression of a packet,
458 * 0 otherwise. This is necessary because of patent nonsense.
461 ccp_fatal_error(unit)
466 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
467 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
470 return x & SC_DC_FERROR;
474 * sifvjcomp - config tcp header compression
477 sifvjcomp(u, vjcomp, cidcomp, maxcid)
478 int u, vjcomp, cidcomp, maxcid;
482 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
483 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
486 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
487 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
488 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
489 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
492 if (ioctl(fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
493 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
500 * sifup - Config the interface up and enable IP packets to pass.
510 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
511 if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
512 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
515 ifr.ifr_flags |= IFF_UP;
516 if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
517 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
520 npi.protocol = PPP_IP;
521 npi.mode = NPMODE_PASS;
522 if (ioctl(fd, PPPIOCSNPMODE, &npi) < 0) {
523 if (errno != ENOTTY) {
524 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
527 /* for backwards compatibility */
528 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
529 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
533 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
534 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
542 * sifdown - Config the interface down and disable IP.
554 npi.protocol = PPP_IP;
555 npi.mode = NPMODE_ERROR;
556 if (ioctl(fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
557 if (errno != ENOTTY) {
558 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
561 /* backwards compatibility */
562 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
563 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
567 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
568 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
575 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
576 if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
577 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
580 ifr.ifr_flags &= ~IFF_UP;
581 if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
582 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
590 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
593 #define SET_SA_FAMILY(addr, family) \
594 BZERO((char *) &(addr), sizeof(addr)); \
595 addr.sa_family = (family); \
596 addr.sa_len = sizeof(addr);
599 * sifaddr - Config the interface IP addresses and netmask.
606 struct ifaliasreq ifra;
608 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
609 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
610 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
611 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
612 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
614 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
615 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
617 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
618 if (ioctl(s, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
619 if (errno != EEXIST) {
620 syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
623 syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
629 * cifaddr - Clear the interface IP addresses, and delete routes
630 * through the interface if possible.
637 struct ifaliasreq ifra;
639 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
640 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
641 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
642 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
643 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
644 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
645 if (ioctl(s, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
646 syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m");
653 * sifdefaultroute - assign a default route through the address given.
656 sifdefaultroute(u, g)
660 return dodefaultroute(g, 's');
664 * cifdefaultroute - delete a default route through the address given.
667 cifdefaultroute(u, g)
671 return dodefaultroute(g, 'c');
675 * dodefaultroute - talk to a routing socket to add/delete a default route.
678 dodefaultroute(g, cmd)
684 struct rt_msghdr hdr;
685 struct sockaddr_in dst;
686 struct sockaddr_in gway;
687 struct sockaddr_in mask;
690 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
691 syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd);
695 memset(&rtmsg, 0, sizeof(rtmsg));
696 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
697 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
698 rtmsg.hdr.rtm_version = RTM_VERSION;
699 rtmsg.hdr.rtm_seq = ++rtm_seq;
700 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
701 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
702 rtmsg.dst.sin_family = AF_INET;
703 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
704 rtmsg.gway.sin_family = AF_INET;
705 rtmsg.gway.sin_addr.s_addr = g;
706 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
707 rtmsg.mask.sin_family = AF_INET;
709 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
710 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
711 syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete");
723 * sifproxyarp - Make a proxy ARP entry for the peer.
726 struct rt_msghdr hdr;
727 struct sockaddr_inarp dst;
728 struct sockaddr_dl hwa;
732 static int arpmsg_valid;
735 sifproxyarp(unit, hisaddr)
743 * Get the hardware address of an interface on the same subnet
744 * as our local address.
746 memset(&arpmsg, 0, sizeof(arpmsg));
747 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
748 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
752 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
753 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
757 arpmsg.hdr.rtm_type = RTM_ADD;
758 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
759 arpmsg.hdr.rtm_version = RTM_VERSION;
760 arpmsg.hdr.rtm_seq = ++rtm_seq;
761 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
762 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
763 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
764 arpmsg.dst.sin_family = AF_INET;
765 arpmsg.dst.sin_addr.s_addr = hisaddr;
766 arpmsg.dst.sin_other = SIN_PROXY;
768 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
769 + arpmsg.hwa.sdl_len;
770 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
771 syslog(LOG_ERR, "add proxy arp entry: %m");
782 * cifproxyarp - Delete the proxy ARP entry for the peer.
785 cifproxyarp(unit, hisaddr)
795 arpmsg.hdr.rtm_type = RTM_DELETE;
796 arpmsg.hdr.rtm_seq = ++rtm_seq;
798 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
799 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
803 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
804 syslog(LOG_ERR, "delete proxy arp entry: %m");
813 #else /* RTM_VERSION */
816 * sifproxyarp - Make a proxy ARP entry for the peer.
819 sifproxyarp(unit, hisaddr)
823 struct arpreq arpreq;
825 struct sockaddr_dl sdl;
829 BZERO(&arpreq, sizeof(arpreq));
832 * Get the hardware address of an interface on the same subnet
833 * as our local address.
835 if (!get_ether_addr(hisaddr, &dls.sdl)) {
836 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
840 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
841 arpreq.arp_ha.sa_family = AF_UNSPEC;
842 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
843 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
844 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
845 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
846 if (ioctl(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
847 syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
855 * cifproxyarp - Delete the proxy ARP entry for the peer.
858 cifproxyarp(unit, hisaddr)
862 struct arpreq arpreq;
864 BZERO(&arpreq, sizeof(arpreq));
865 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
866 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
867 if (ioctl(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
868 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
873 #endif /* RTM_VERSION */
877 * get_ether_addr - get the hardware address of an interface on the
878 * the same subnet as ipaddr.
883 get_ether_addr(ipaddr, hwaddr)
885 struct sockaddr_dl *hwaddr;
887 struct ifreq *ifr, *ifend, *ifp;
889 struct sockaddr_dl *dla;
892 struct ifreq ifs[MAX_IFS];
894 ifc.ifc_len = sizeof(ifs);
896 if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
897 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
902 * Scan through looking for an interface with an Internet
903 * address on the same subnet as `ipaddr'.
905 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
906 for (ifr = ifc.ifc_req; ifr < ifend; ) {
907 if (ifr->ifr_addr.sa_family == AF_INET) {
908 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
909 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
911 * Check that the interface is up, and not point-to-point
914 if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
916 if ((ifreq.ifr_flags &
917 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
918 != (IFF_UP|IFF_BROADCAST))
921 * Get its netmask and check that it's on the right subnet.
923 if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
925 mask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
926 if ((ipaddr & mask) != (ina & mask))
931 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
936 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
939 * Now scan through again looking for a link-level address
940 * for this interface.
943 for (ifr = ifc.ifc_req; ifr < ifend; ) {
944 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
945 && ifr->ifr_addr.sa_family == AF_LINK) {
947 * Found the link-level address - copy it out
949 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
950 BCOPY(dla, hwaddr, dla->sdl_len);
953 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);