/*
- * auth.c - PPP authentication and phase control.
+ * demand.c - Support routines for demand-dialling.
*
- * Copyright (c) 1993 The Australian National University.
- * All rights reserved.
+ * Copyright (c) 1996-2002 Paul Mackerras. All rights reserved.
*
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the Australian National University. The name of the University
- * may not be used to endorse or promote products derived from this
- * software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * 3. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by Paul Mackerras
+ * <paulus@samba.org>".
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
-#ifndef lint
-static char rcsid[] = "$Id: demand.c,v 1.1 1996/01/01 23:10:09 paulus Exp $";
-#endif
+#define RCSID "$Id: demand.c,v 1.19 2004/11/04 10:02:26 paulus Exp $"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
-#include <syslog.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
-#include <net/if.h>
+#ifdef PPP_FILTER
+#include <pcap-bpf.h>
+#endif
#include "pppd.h"
#include "fsm.h"
#include "ipcp.h"
#include "lcp.h"
+static const char rcsid[] = RCSID;
+
char *frame;
int framelen;
int framemax;
struct packet *pend_q;
struct packet *pend_qtail;
+static int active_packet __P((unsigned char *, int));
+
/*
* demand_conf - configure the interface for doing dial-on-demand.
*/
flush_flag = 0;
fcs = PPP_INITFCS;
- ppp_send_config(0, PPP_MRU, (u_int32_t) 0, 0, 0);
- ppp_recv_config(0, PPP_MRU, (u_int32_t) 0, 0, 0);
+ netif_set_mtu(0, MIN(lcp_allowoptions[0].mru, PPP_MRU));
+ if (ppp_send_config(0, PPP_MRU, (u_int32_t) 0, 0, 0) < 0
+ || ppp_recv_config(0, PPP_MRU, (u_int32_t) 0, 0, 0) < 0)
+ fatal("Couldn't set up demand-dialled PPP interface: %m");
+
+#ifdef PPP_FILTER
+ set_filters(&pass_filter, &active_filter);
+#endif
/*
* Call the demand_conf procedure for each protocol that's got one.
for (i = 0; (protp = protocols[i]) != NULL; ++i)
if (protp->enabled_flag && protp->demand_conf != NULL)
- sifnpmode(0, protp->protocol, NPMODE_QUEUE);
+ sifnpmode(0, protp->protocol & ~0x8000, NPMODE_QUEUE);
get_loop_output();
}
for (i = 0; (protp = protocols[i]) != NULL; ++i)
if (protp->enabled_flag && protp->demand_conf != NULL)
- sifnpmode(0, protp->protocol, NPMODE_ERROR);
+ sifnpmode(0, protp->protocol & ~0x8000, NPMODE_ERROR);
get_loop_output();
/* discard all saved packets */
for (i = 0; (protp = protocols[i]) != NULL; ++i)
if (protp->enabled_flag && protp->demand_conf != NULL)
- sifnpmode(0, protp->protocol, NPMODE_PASS);
+ sifnpmode(0, protp->protocol & ~0x8000, NPMODE_PASS);
}
/*
if (!escape_flag && !flush_flag
&& framelen > 2 && fcs == PPP_GOODFCS) {
framelen -= 2;
- if (loop_frame(frame, framelen))
+ if (loop_frame((unsigned char *)frame, framelen))
rv = 1;
}
framelen = 0;
* decide whether to bring up the link or not, and, if we want
* to transmit this frame later, put it on the pending queue.
* Return value is 1 if we need to bring up the link, 0 otherwise.
+ * We assume that the kernel driver has already applied the
+ * pass_filter, so we won't get packets it rejected.
+ * We apply the active_filter to see if we want this packet to
+ * bring up the link.
*/
int
loop_frame(frame, len)
{
struct packet *pkt;
+ /* dbglog("from loop: %P", frame, len); */
if (len < PPP_HDRLEN)
return 0;
- if (PPP_PROTOCOL(frame) != PPP_IP)
+ if ((PPP_PROTOCOL(frame) & 0x8000) != 0)
+ return 0; /* shouldn't get any of these anyway */
+ if (!active_packet(frame, len))
return 0;
+
pkt = (struct packet *) malloc(sizeof(struct packet) + len);
if (pkt != NULL) {
pkt->length = len;
pkt = pend_q;
pend_q = NULL;
for (; pkt != NULL; pkt = nextpkt) {
+ nextpkt = pkt->next;
if (PPP_PROTOCOL(pkt->data) == proto) {
output(0, pkt->data, pkt->length);
- nextpkt = pkt->next;
free(pkt);
} else {
if (prev == NULL)
}
}
pend_qtail = prev;
+ if (prev != NULL)
+ prev->next = NULL;
+}
+
+/*
+ * Scan a packet to decide whether it is an "active" packet,
+ * that is, whether it is worth bringing up the link for.
+ */
+static int
+active_packet(p, len)
+ unsigned char *p;
+ int len;
+{
+ int proto, i;
+ struct protent *protp;
+
+ if (len < PPP_HDRLEN)
+ return 0;
+ proto = PPP_PROTOCOL(p);
+#ifdef PPP_FILTER
+ if (pass_filter.bf_len != 0
+ && bpf_filter(pass_filter.bf_insns, p, len, len) == 0)
+ return 0;
+ if (active_filter.bf_len != 0
+ && bpf_filter(active_filter.bf_insns, p, len, len) == 0)
+ return 0;
+#endif
+ for (i = 0; (protp = protocols[i]) != NULL; ++i) {
+ if (protp->protocol < 0xC000 && (protp->protocol & ~0x8000) == proto) {
+ if (!protp->enabled_flag)
+ return 0;
+ if (protp->active_pkt == NULL)
+ return 1;
+ return (*protp->active_pkt)(p, len);
+ }
+ }
+ return 0; /* not a supported protocol !!?? */
}
projects / ppp.git / blobdiff