17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * demand.c - Support routines for demand-dialling.
37c478bd9Sstevel@tonic-gate *
4*f53eecf5SJames Carlson * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
57c478bd9Sstevel@tonic-gate * Use is subject to license terms.
67c478bd9Sstevel@tonic-gate *
77c478bd9Sstevel@tonic-gate * Copyright (c) 1993 The Australian National University.
87c478bd9Sstevel@tonic-gate * All rights reserved.
97c478bd9Sstevel@tonic-gate *
107c478bd9Sstevel@tonic-gate * Redistribution and use in source and binary forms are permitted
117c478bd9Sstevel@tonic-gate * provided that the above copyright notice and this paragraph are
127c478bd9Sstevel@tonic-gate * duplicated in all such forms and that any documentation,
137c478bd9Sstevel@tonic-gate * advertising materials, and other materials related to such
147c478bd9Sstevel@tonic-gate * distribution and use acknowledge that the software was developed
157c478bd9Sstevel@tonic-gate * by the Australian National University. The name of the University
167c478bd9Sstevel@tonic-gate * may not be used to endorse or promote products derived from this
177c478bd9Sstevel@tonic-gate * software without specific prior written permission.
187c478bd9Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
197c478bd9Sstevel@tonic-gate * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
207c478bd9Sstevel@tonic-gate * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
217c478bd9Sstevel@tonic-gate */
227c478bd9Sstevel@tonic-gate
237c478bd9Sstevel@tonic-gate #include <stdio.h>
247c478bd9Sstevel@tonic-gate #include <stdlib.h>
257c478bd9Sstevel@tonic-gate #include <string.h>
267c478bd9Sstevel@tonic-gate #include <errno.h>
277c478bd9Sstevel@tonic-gate #include <fcntl.h>
287c478bd9Sstevel@tonic-gate #include <netdb.h>
297c478bd9Sstevel@tonic-gate #include <sys/param.h>
307c478bd9Sstevel@tonic-gate #include <sys/types.h>
317c478bd9Sstevel@tonic-gate #include <sys/wait.h>
327c478bd9Sstevel@tonic-gate #include <sys/time.h>
337c478bd9Sstevel@tonic-gate #include <sys/resource.h>
347c478bd9Sstevel@tonic-gate #include <sys/stat.h>
357c478bd9Sstevel@tonic-gate #include <sys/socket.h>
367c478bd9Sstevel@tonic-gate #ifdef PPP_FILTER
377c478bd9Sstevel@tonic-gate #include <net/if.h>
387c478bd9Sstevel@tonic-gate #include <net/bpf.h>
397c478bd9Sstevel@tonic-gate #include <pcap.h>
407c478bd9Sstevel@tonic-gate #endif
417c478bd9Sstevel@tonic-gate
427c478bd9Sstevel@tonic-gate #include "pppd.h"
437c478bd9Sstevel@tonic-gate #include "fsm.h"
447c478bd9Sstevel@tonic-gate #include "lcp.h"
457c478bd9Sstevel@tonic-gate
467c478bd9Sstevel@tonic-gate static char *frame;
477c478bd9Sstevel@tonic-gate static int framelen;
487c478bd9Sstevel@tonic-gate static int framemax;
497c478bd9Sstevel@tonic-gate static int escape_flag;
507c478bd9Sstevel@tonic-gate static int flush_flag;
517c478bd9Sstevel@tonic-gate static int fcs;
527c478bd9Sstevel@tonic-gate
537c478bd9Sstevel@tonic-gate struct packet {
547c478bd9Sstevel@tonic-gate int length;
557c478bd9Sstevel@tonic-gate struct packet *next;
567c478bd9Sstevel@tonic-gate unsigned char data[1];
577c478bd9Sstevel@tonic-gate };
587c478bd9Sstevel@tonic-gate
597c478bd9Sstevel@tonic-gate static struct packet *pend_q;
607c478bd9Sstevel@tonic-gate static struct packet *pend_qtail;
617c478bd9Sstevel@tonic-gate
627c478bd9Sstevel@tonic-gate static int active_packet __P((unsigned char *, int));
637c478bd9Sstevel@tonic-gate
647c478bd9Sstevel@tonic-gate /*
657c478bd9Sstevel@tonic-gate * demand_conf - configure the interface for doing dial-on-demand.
667c478bd9Sstevel@tonic-gate */
677c478bd9Sstevel@tonic-gate void
demand_conf()687c478bd9Sstevel@tonic-gate demand_conf()
697c478bd9Sstevel@tonic-gate {
707c478bd9Sstevel@tonic-gate int i;
717c478bd9Sstevel@tonic-gate struct protent *protp;
727c478bd9Sstevel@tonic-gate int mtu;
737c478bd9Sstevel@tonic-gate
747c478bd9Sstevel@tonic-gate framemax = lcp_wantoptions[0].mru;
757c478bd9Sstevel@tonic-gate if (framemax < PPP_MRU)
767c478bd9Sstevel@tonic-gate framemax = PPP_MRU;
777c478bd9Sstevel@tonic-gate framemax += PPP_HDRLEN + PPP_FCSLEN;
787c478bd9Sstevel@tonic-gate frame = malloc(framemax);
797c478bd9Sstevel@tonic-gate if (frame == NULL)
807c478bd9Sstevel@tonic-gate novm("demand frame");
817c478bd9Sstevel@tonic-gate framelen = 0;
827c478bd9Sstevel@tonic-gate pend_q = NULL;
837c478bd9Sstevel@tonic-gate escape_flag = 0;
847c478bd9Sstevel@tonic-gate flush_flag = 0;
857c478bd9Sstevel@tonic-gate fcs = PPP_INITFCS;
867c478bd9Sstevel@tonic-gate
877c478bd9Sstevel@tonic-gate if ((mtu = lcp_allowoptions[0].mru) == 0)
887c478bd9Sstevel@tonic-gate mtu = PPP_MTU;
897c478bd9Sstevel@tonic-gate ppp_send_config(0, mtu, (u_int32_t) 0, 0, 0);
907c478bd9Sstevel@tonic-gate ppp_recv_config(0, framemax, (u_int32_t) 0, 0, 0);
917c478bd9Sstevel@tonic-gate
927c478bd9Sstevel@tonic-gate #ifdef PPP_FILTER
937c478bd9Sstevel@tonic-gate set_filters(&pass_filter, &active_filter);
947c478bd9Sstevel@tonic-gate #endif
957c478bd9Sstevel@tonic-gate
967c478bd9Sstevel@tonic-gate /*
977c478bd9Sstevel@tonic-gate * Call the demand_conf procedure for each protocol that's got one.
987c478bd9Sstevel@tonic-gate */
997c478bd9Sstevel@tonic-gate for (i = 0; (protp = protocols[i]) != NULL; ++i)
1007c478bd9Sstevel@tonic-gate if (protp->enabled_flag && protp->demand_conf != NULL)
1017c478bd9Sstevel@tonic-gate if (!((*protp->demand_conf)(0)))
1027c478bd9Sstevel@tonic-gate fatal("unable to set demand configuration on %s", protp->name);
1037c478bd9Sstevel@tonic-gate }
1047c478bd9Sstevel@tonic-gate
1057c478bd9Sstevel@tonic-gate
1067c478bd9Sstevel@tonic-gate /*
1077c478bd9Sstevel@tonic-gate * demand_block - set each network protocol to block further packets.
1087c478bd9Sstevel@tonic-gate */
1097c478bd9Sstevel@tonic-gate void
demand_block()1107c478bd9Sstevel@tonic-gate demand_block()
1117c478bd9Sstevel@tonic-gate {
1127c478bd9Sstevel@tonic-gate int i;
1137c478bd9Sstevel@tonic-gate struct protent *protp;
1147c478bd9Sstevel@tonic-gate
1157c478bd9Sstevel@tonic-gate for (i = 0; (protp = protocols[i]) != NULL; ++i)
1167c478bd9Sstevel@tonic-gate if (protp->enabled_flag && protp->demand_conf != NULL &&
1177c478bd9Sstevel@tonic-gate !sifnpmode(0, protp->protocol & ~0x8000, NPMODE_QUEUE))
1187c478bd9Sstevel@tonic-gate fatal("unable to enable queuing for %s", protp->name);
1197c478bd9Sstevel@tonic-gate /* Intentionally discard return value; we're on our way up now. */
1207c478bd9Sstevel@tonic-gate (void) get_loop_output();
1217c478bd9Sstevel@tonic-gate }
1227c478bd9Sstevel@tonic-gate
1237c478bd9Sstevel@tonic-gate /*
1247c478bd9Sstevel@tonic-gate * demand_discard - set each network protocol to discard packets
1257c478bd9Sstevel@tonic-gate * with an error.
1267c478bd9Sstevel@tonic-gate */
1277c478bd9Sstevel@tonic-gate void
demand_discard()1287c478bd9Sstevel@tonic-gate demand_discard()
1297c478bd9Sstevel@tonic-gate {
1307c478bd9Sstevel@tonic-gate struct packet *pkt, *nextpkt;
1317c478bd9Sstevel@tonic-gate int i;
1327c478bd9Sstevel@tonic-gate struct protent *protp;
1337c478bd9Sstevel@tonic-gate
1347c478bd9Sstevel@tonic-gate for (i = 0; (protp = protocols[i]) != NULL; ++i)
1357c478bd9Sstevel@tonic-gate if (protp->enabled_flag && protp->demand_conf != NULL &&
1367c478bd9Sstevel@tonic-gate !sifnpmode(0, protp->protocol & ~0x8000, NPMODE_DROP))
1377c478bd9Sstevel@tonic-gate fatal("unable to disable %s", protp->name);
1387c478bd9Sstevel@tonic-gate
1397c478bd9Sstevel@tonic-gate /* Intentionally discard return value; we're on our way down now. */
1407c478bd9Sstevel@tonic-gate (void) get_loop_output();
1417c478bd9Sstevel@tonic-gate
1427c478bd9Sstevel@tonic-gate /* discard all saved packets */
1437c478bd9Sstevel@tonic-gate for (pkt = pend_q; pkt != NULL; pkt = nextpkt) {
1447c478bd9Sstevel@tonic-gate nextpkt = pkt->next;
1457c478bd9Sstevel@tonic-gate free(pkt);
1467c478bd9Sstevel@tonic-gate }
1477c478bd9Sstevel@tonic-gate pend_q = NULL;
1487c478bd9Sstevel@tonic-gate framelen = 0;
1497c478bd9Sstevel@tonic-gate flush_flag = 0;
1507c478bd9Sstevel@tonic-gate escape_flag = 0;
1517c478bd9Sstevel@tonic-gate fcs = PPP_INITFCS;
1527c478bd9Sstevel@tonic-gate }
1537c478bd9Sstevel@tonic-gate
1547c478bd9Sstevel@tonic-gate /*
1557c478bd9Sstevel@tonic-gate * demand_unblock - set each enabled network protocol to pass packets.
1567c478bd9Sstevel@tonic-gate */
1577c478bd9Sstevel@tonic-gate void
demand_unblock()1587c478bd9Sstevel@tonic-gate demand_unblock()
1597c478bd9Sstevel@tonic-gate {
1607c478bd9Sstevel@tonic-gate int i;
1617c478bd9Sstevel@tonic-gate struct protent *protp;
1627c478bd9Sstevel@tonic-gate
1637c478bd9Sstevel@tonic-gate for (i = 0; (protp = protocols[i]) != NULL; ++i)
1647c478bd9Sstevel@tonic-gate if (protp->enabled_flag && protp->demand_conf != NULL &&
1657c478bd9Sstevel@tonic-gate !sifnpmode(0, protp->protocol & ~0x8000, NPMODE_PASS))
1667c478bd9Sstevel@tonic-gate fatal("unable to enable %s", protp->name);
1677c478bd9Sstevel@tonic-gate }
1687c478bd9Sstevel@tonic-gate
1697c478bd9Sstevel@tonic-gate /*
1707c478bd9Sstevel@tonic-gate * FCS lookup table as calculated by genfcstab.
1717c478bd9Sstevel@tonic-gate */
1727c478bd9Sstevel@tonic-gate static u_short fcstab[256] = {
1737c478bd9Sstevel@tonic-gate 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
1747c478bd9Sstevel@tonic-gate 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
1757c478bd9Sstevel@tonic-gate 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
1767c478bd9Sstevel@tonic-gate 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
1777c478bd9Sstevel@tonic-gate 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
1787c478bd9Sstevel@tonic-gate 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
1797c478bd9Sstevel@tonic-gate 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
1807c478bd9Sstevel@tonic-gate 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
1817c478bd9Sstevel@tonic-gate 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
1827c478bd9Sstevel@tonic-gate 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
1837c478bd9Sstevel@tonic-gate 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
1847c478bd9Sstevel@tonic-gate 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
1857c478bd9Sstevel@tonic-gate 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
1867c478bd9Sstevel@tonic-gate 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
1877c478bd9Sstevel@tonic-gate 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
1887c478bd9Sstevel@tonic-gate 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
1897c478bd9Sstevel@tonic-gate 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
1907c478bd9Sstevel@tonic-gate 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
1917c478bd9Sstevel@tonic-gate 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
1927c478bd9Sstevel@tonic-gate 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
1937c478bd9Sstevel@tonic-gate 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
1947c478bd9Sstevel@tonic-gate 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
1957c478bd9Sstevel@tonic-gate 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
1967c478bd9Sstevel@tonic-gate 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
1977c478bd9Sstevel@tonic-gate 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
1987c478bd9Sstevel@tonic-gate 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
1997c478bd9Sstevel@tonic-gate 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
2007c478bd9Sstevel@tonic-gate 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
2017c478bd9Sstevel@tonic-gate 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
2027c478bd9Sstevel@tonic-gate 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
2037c478bd9Sstevel@tonic-gate 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
2047c478bd9Sstevel@tonic-gate 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
2057c478bd9Sstevel@tonic-gate };
2067c478bd9Sstevel@tonic-gate
2077c478bd9Sstevel@tonic-gate /*
2087c478bd9Sstevel@tonic-gate * loop_chars - process characters received from the loopback.
2097c478bd9Sstevel@tonic-gate * Calls loop_frame when a complete frame has been accumulated.
2107c478bd9Sstevel@tonic-gate * Return value is 1 if we need to bring up the link, 0 otherwise.
2117c478bd9Sstevel@tonic-gate */
2127c478bd9Sstevel@tonic-gate int
loop_chars(p,n)2137c478bd9Sstevel@tonic-gate loop_chars(p, n)
2147c478bd9Sstevel@tonic-gate unsigned char *p;
2157c478bd9Sstevel@tonic-gate int n;
2167c478bd9Sstevel@tonic-gate {
2177c478bd9Sstevel@tonic-gate int c, rv;
2187c478bd9Sstevel@tonic-gate
2197c478bd9Sstevel@tonic-gate rv = 0;
2207c478bd9Sstevel@tonic-gate for (; n > 0; --n) {
2217c478bd9Sstevel@tonic-gate c = *p++;
2227c478bd9Sstevel@tonic-gate if (c == PPP_FLAG) {
2237c478bd9Sstevel@tonic-gate if (!escape_flag && !flush_flag
2247c478bd9Sstevel@tonic-gate && framelen > 2 && fcs == PPP_GOODFCS) {
2257c478bd9Sstevel@tonic-gate framelen -= 2;
2267c478bd9Sstevel@tonic-gate if (loop_frame((unsigned char *)frame, framelen))
2277c478bd9Sstevel@tonic-gate rv = 1;
2287c478bd9Sstevel@tonic-gate }
2297c478bd9Sstevel@tonic-gate framelen = 0;
2307c478bd9Sstevel@tonic-gate flush_flag = 0;
2317c478bd9Sstevel@tonic-gate escape_flag = 0;
2327c478bd9Sstevel@tonic-gate fcs = PPP_INITFCS;
2337c478bd9Sstevel@tonic-gate continue;
2347c478bd9Sstevel@tonic-gate }
2357c478bd9Sstevel@tonic-gate if (flush_flag)
2367c478bd9Sstevel@tonic-gate continue;
2377c478bd9Sstevel@tonic-gate if (escape_flag) {
2387c478bd9Sstevel@tonic-gate c ^= PPP_TRANS;
2397c478bd9Sstevel@tonic-gate escape_flag = 0;
2407c478bd9Sstevel@tonic-gate } else if (c == PPP_ESCAPE) {
2417c478bd9Sstevel@tonic-gate escape_flag = 1;
2427c478bd9Sstevel@tonic-gate continue;
2437c478bd9Sstevel@tonic-gate }
2447c478bd9Sstevel@tonic-gate if (framelen >= framemax) {
2457c478bd9Sstevel@tonic-gate flush_flag = 1;
2467c478bd9Sstevel@tonic-gate continue;
2477c478bd9Sstevel@tonic-gate }
2487c478bd9Sstevel@tonic-gate frame[framelen++] = c;
2497c478bd9Sstevel@tonic-gate fcs = PPP_FCS(fcs, c);
2507c478bd9Sstevel@tonic-gate }
2517c478bd9Sstevel@tonic-gate return rv;
2527c478bd9Sstevel@tonic-gate }
2537c478bd9Sstevel@tonic-gate
2547c478bd9Sstevel@tonic-gate /*
2557c478bd9Sstevel@tonic-gate * loop_frame - given a frame obtained from the loopback,
2567c478bd9Sstevel@tonic-gate * decide whether to bring up the link or not, and, if we want
2577c478bd9Sstevel@tonic-gate * to transmit this frame later, put it on the pending queue.
2587c478bd9Sstevel@tonic-gate * Return value is 1 if we need to bring up the link, 0 otherwise.
2597c478bd9Sstevel@tonic-gate * We assume that the kernel driver has already applied the
2607c478bd9Sstevel@tonic-gate * pass_filter, so we won't get packets it rejected.
2617c478bd9Sstevel@tonic-gate * We apply the active_filter to see if we want this packet to
2627c478bd9Sstevel@tonic-gate * bring up the link.
2637c478bd9Sstevel@tonic-gate */
2647c478bd9Sstevel@tonic-gate int
loop_frame(frame,len)2657c478bd9Sstevel@tonic-gate loop_frame(frame, len)
2667c478bd9Sstevel@tonic-gate unsigned char *frame;
2677c478bd9Sstevel@tonic-gate int len;
2687c478bd9Sstevel@tonic-gate {
2697c478bd9Sstevel@tonic-gate struct packet *pkt;
2707c478bd9Sstevel@tonic-gate
2717c478bd9Sstevel@tonic-gate if (len < PPP_HDRLEN)
2727c478bd9Sstevel@tonic-gate return 0;
2737c478bd9Sstevel@tonic-gate if ((PPP_PROTOCOL(frame) & 0x8000) != 0)
2747c478bd9Sstevel@tonic-gate return 0; /* shouldn't get any of these anyway */
2757c478bd9Sstevel@tonic-gate
2767c478bd9Sstevel@tonic-gate /* Note - once we have pending packets, we don't drop any more. */
2777c478bd9Sstevel@tonic-gate if (pend_q == NULL && !active_packet(frame, len))
2787c478bd9Sstevel@tonic-gate return 0;
2797c478bd9Sstevel@tonic-gate
2807c478bd9Sstevel@tonic-gate pkt = (struct packet *) malloc(sizeof(struct packet) + len);
2817c478bd9Sstevel@tonic-gate if (pkt != NULL) {
2827c478bd9Sstevel@tonic-gate pkt->length = len;
2837c478bd9Sstevel@tonic-gate pkt->next = NULL;
2847c478bd9Sstevel@tonic-gate (void) memcpy(pkt->data, frame, len);
2857c478bd9Sstevel@tonic-gate if (pend_q == NULL)
2867c478bd9Sstevel@tonic-gate pend_q = pkt;
2877c478bd9Sstevel@tonic-gate else
2887c478bd9Sstevel@tonic-gate pend_qtail->next = pkt;
2897c478bd9Sstevel@tonic-gate pend_qtail = pkt;
2907c478bd9Sstevel@tonic-gate }
2917c478bd9Sstevel@tonic-gate return 1;
2927c478bd9Sstevel@tonic-gate }
2937c478bd9Sstevel@tonic-gate
2947c478bd9Sstevel@tonic-gate /*
2957c478bd9Sstevel@tonic-gate * demand_rexmit - Resend all those frames that we got via the
2967c478bd9Sstevel@tonic-gate * loopback, now that the real serial link is up.
2977c478bd9Sstevel@tonic-gate */
2987c478bd9Sstevel@tonic-gate void
demand_rexmit(proto)2997c478bd9Sstevel@tonic-gate demand_rexmit(proto)
3007c478bd9Sstevel@tonic-gate int proto;
3017c478bd9Sstevel@tonic-gate {
3027c478bd9Sstevel@tonic-gate struct packet *pkt, *prev, *nextpkt;
3037c478bd9Sstevel@tonic-gate
3047c478bd9Sstevel@tonic-gate prev = NULL;
3057c478bd9Sstevel@tonic-gate pkt = pend_q;
3067c478bd9Sstevel@tonic-gate pend_q = NULL;
3077c478bd9Sstevel@tonic-gate for (; pkt != NULL; pkt = nextpkt) {
3087c478bd9Sstevel@tonic-gate nextpkt = pkt->next;
3097c478bd9Sstevel@tonic-gate if (PPP_PROTOCOL(pkt->data) == proto) {
3107c478bd9Sstevel@tonic-gate output(0, pkt->data, pkt->length);
3117c478bd9Sstevel@tonic-gate free(pkt);
3127c478bd9Sstevel@tonic-gate } else {
3137c478bd9Sstevel@tonic-gate if (prev == NULL)
3147c478bd9Sstevel@tonic-gate pend_q = pkt;
3157c478bd9Sstevel@tonic-gate else
3167c478bd9Sstevel@tonic-gate prev->next = pkt;
3177c478bd9Sstevel@tonic-gate prev = pkt;
3187c478bd9Sstevel@tonic-gate }
3197c478bd9Sstevel@tonic-gate }
3207c478bd9Sstevel@tonic-gate pend_qtail = prev;
3217c478bd9Sstevel@tonic-gate if (prev != NULL)
3227c478bd9Sstevel@tonic-gate prev->next = NULL;
3237c478bd9Sstevel@tonic-gate }
3247c478bd9Sstevel@tonic-gate
3257c478bd9Sstevel@tonic-gate /*
3267c478bd9Sstevel@tonic-gate * Scan a packet to decide whether it is an "active" packet,
3277c478bd9Sstevel@tonic-gate * that is, whether it is worth bringing up the link for.
3287c478bd9Sstevel@tonic-gate */
3297c478bd9Sstevel@tonic-gate static int
active_packet(p,len)3307c478bd9Sstevel@tonic-gate active_packet(p, len)
3317c478bd9Sstevel@tonic-gate unsigned char *p;
3327c478bd9Sstevel@tonic-gate int len;
3337c478bd9Sstevel@tonic-gate {
3347c478bd9Sstevel@tonic-gate int proto, i;
3357c478bd9Sstevel@tonic-gate struct protent *protp;
3367c478bd9Sstevel@tonic-gate const char *cp;
3377c478bd9Sstevel@tonic-gate char pbuf[32];
3387c478bd9Sstevel@tonic-gate
3397c478bd9Sstevel@tonic-gate if (len < PPP_HDRLEN)
3407c478bd9Sstevel@tonic-gate return 0;
3417c478bd9Sstevel@tonic-gate #ifdef PPP_FILTER
3427c478bd9Sstevel@tonic-gate if (active_filter.bf_len != 0
3437c478bd9Sstevel@tonic-gate && bpf_filter(active_filter.bf_insns, frame, len, len) == 0) {
3447c478bd9Sstevel@tonic-gate dbglog("BPF identified packet as not worth bringing up the link.");
3457c478bd9Sstevel@tonic-gate return 0;
3467c478bd9Sstevel@tonic-gate }
3477c478bd9Sstevel@tonic-gate #endif
3487c478bd9Sstevel@tonic-gate proto = PPP_PROTOCOL(p);
3497c478bd9Sstevel@tonic-gate for (i = 0; (protp = protocols[i]) != NULL; ++i) {
3507c478bd9Sstevel@tonic-gate if (protp->protocol < 0xC000 && (protp->protocol & ~0x8000) == proto) {
3517c478bd9Sstevel@tonic-gate if (!protp->enabled_flag) {
3527c478bd9Sstevel@tonic-gate dbglog("%s: not enabled; not bringing up link", protp->name);
3537c478bd9Sstevel@tonic-gate return 0;
3547c478bd9Sstevel@tonic-gate }
3557c478bd9Sstevel@tonic-gate if (protp->active_pkt == NULL) {
356*f53eecf5SJames Carlson notice("%s: no active test; bringing up link", protp->name);
3577c478bd9Sstevel@tonic-gate return 1;
3587c478bd9Sstevel@tonic-gate }
3597c478bd9Sstevel@tonic-gate i = (*protp->active_pkt)(p, len);
360*f53eecf5SJames Carlson if (i != 0)
361*f53eecf5SJames Carlson notice("%s: active test; bringing up link", protp->name);
362*f53eecf5SJames Carlson else
363*f53eecf5SJames Carlson dbglog("%s: active test; not bringing up link",
364*f53eecf5SJames Carlson protp->name);
3657c478bd9Sstevel@tonic-gate return i;
3667c478bd9Sstevel@tonic-gate }
3677c478bd9Sstevel@tonic-gate }
3687c478bd9Sstevel@tonic-gate if ((cp = protocol_name(proto)) == NULL) {
3697c478bd9Sstevel@tonic-gate (void) slprintf(pbuf, sizeof (pbuf), "0x#X", proto);
3707c478bd9Sstevel@tonic-gate cp = (const char *)pbuf;
3717c478bd9Sstevel@tonic-gate }
3727c478bd9Sstevel@tonic-gate dbglog("%s: unknown protocol; not bringing up link", cp);
3737c478bd9Sstevel@tonic-gate return 0; /* not a supported protocol !!?? */
3747c478bd9Sstevel@tonic-gate }
375