X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fmultilink.c;h=135cab0b42ad419d1c4297240cf464ca6b83b14f;hp=7a8165945e875aedc70202d8f73c99510987fa4e;hb=9f7c27af1b0b3ca29c673574322b2c23f1184803;hpb=7f804a990ae237a2ec2d53439258642df27df974

diff --git a/pppd/multilink.c b/pppd/multilink.c
index 7a81659..135cab0 100644
--- a/pppd/multilink.c
+++ b/pppd/multilink.c
@@ -1,23 +1,40 @@
 /*
  * multilink.c - support routines for multilink.
  *
- * Copyright (c) 2000 Paul Mackerras.
- * All rights reserved.
+ * Copyright (c) 2000-2002 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.  The name of the author 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.
  */
 #include <string.h>
 #include <ctype.h>
 #include <stdlib.h>
 #include <netdb.h>
+#include <errno.h>
+#include <signal.h>
 #include <netinet/in.h>
+#include <unistd.h>
 
 #include "pppd.h"
 #include "fsm.h"
@@ -26,11 +43,20 @@
 
 bool endpoint_specified;	/* user gave explicit endpoint discriminator */
 char *bundle_id;		/* identifier for our bundle */
+char *blinks_id;		/* key for the list of links */
+bool doing_multilink;		/* multilink was enabled and agreed to */
+bool multilink_master;		/* we own the multilink bundle */
 
 extern TDB_CONTEXT *pppdb;
 extern char db_key[];
 
+static void make_bundle_links __P((int append));
+static void remove_bundle_link __P((void));
+static void iterate_bundle_links __P((void (*func) __P((char *))));
+
 static int get_default_epdisc __P((struct epdisc *));
+static int parse_num __P((char *str, const char *key, int *valp));
+static int owns_unit __P((TDB_DATA pid, int unit));
 
 #define set_ip_epdisc(ep, addr) do {	\
 	ep->length = 4;			\
@@ -45,12 +71,15 @@ static int get_default_epdisc __P((struct epdisc *));
 	 || ((addr) & 0xfff00000) == 0xac100000		/* 172.16.x.x */  \
 	 || ((addr) & 0xffff0000) == 0xc0a80000)	/* 192.168.x.x */
 
+#define process_exists(n)	(kill((n), 0) == 0 || errno != ESRCH)
+
 void
 mp_check_options()
 {
 	lcp_options *wo = &lcp_wantoptions[0];
 	lcp_options *ao = &lcp_allowoptions[0];
 
+	doing_multilink = 0;
 	if (!multilink)
 		return;
 	/* if we're doing multilink, we have to negotiate MRRU */
@@ -65,9 +94,6 @@ mp_check_options()
 	if (!wo->neg_endpoint && !noendpoint) {
 		/* get a default endpoint value */
 		wo->neg_endpoint = get_default_epdisc(&wo->endpoint);
-		if (wo->neg_endpoint)
-			info("using default endpoint %s",
-			     epdisc_to_str(&wo->endpoint));
 	}
 }
 
@@ -80,21 +106,45 @@ mp_join_bundle()
 {
 	lcp_options *go = &lcp_gotoptions[0];
 	lcp_options *ho = &lcp_hisoptions[0];
-	int unit;
-	int i, l;
-	char *p, *endp;
+	lcp_options *ao = &lcp_allowoptions[0];
+	int unit, pppd_pid;
+	int l, mtu;
+	char *p;
 	TDB_DATA key, pid, rec;
 
+	if (doing_multilink) {
+		/* have previously joined a bundle */
+		if (!go->neg_mrru || !ho->neg_mrru) {
+			notice("oops, didn't get multilink on renegotiation");
+			lcp_close(0, "multilink required");
+			return 0;
+		}
+		/* XXX should check the peer_authname and ho->endpoint
+		   are the same as previously */
+		return 0;
+	}
+
 	if (!go->neg_mrru || !ho->neg_mrru) {
 		/* not doing multilink */
 		if (go->neg_mrru)
 			notice("oops, multilink negotiated only for receive");
-		multilink = 0;
+		mtu = ho->neg_mru? ho->mru: PPP_MRU;
+		if (mtu > ao->mru)
+			mtu = ao->mru;
+		if (demand) {
+			/* already have a bundle */
+			cfg_bundle(0, 0, 0, 0);
+			netif_set_mtu(0, mtu);
+			return 0;
+		}
 		make_new_bundle(0, 0, 0, 0);
 		set_ifunit(1);
+		netif_set_mtu(0, mtu);
 		return 0;
 	}
 
+	doing_multilink = 1;
+
 	/*
 	 * Find the appropriate bundle or join a new one.
 	 * First we make up a name for the bundle.
@@ -119,27 +169,47 @@ mp_join_bundle()
 			      epdisc_to_str(&ho->endpoint));
 	if (bundle_name)
 		p += slprintf(p, bundle_id+l-p, "/%v", bundle_name);
-	info("bundle_id = %s", bundle_id+7);
+
+	/* Make the key for the list of links belonging to the bundle */
+	l = p - bundle_id;
+	blinks_id = malloc(l + 7);
+	if (blinks_id == NULL)
+		novm("bundle links key");
+	slprintf(blinks_id, l + 7, "BUNDLE_LINKS=%s", bundle_id + 7);
+
+	/*
+	 * For demand mode, we only need to configure the bundle
+	 * and attach the link.
+	 */
+	mtu = MIN(ho->mrru, ao->mru);
+	if (demand) {
+		cfg_bundle(go->mrru, ho->mrru, go->neg_ssnhf, ho->neg_ssnhf);
+		netif_set_mtu(0, mtu);
+		script_setenv("BUNDLE", bundle_id + 7, 1);
+		return 0;
+	}
 
 	/*
 	 * Check if the bundle ID is already in the database.
 	 */
 	unit = -1;
+	lock_db();
 	key.dptr = bundle_id;
 	key.dsize = p - bundle_id;
 	pid = tdb_fetch(pppdb, key);
 	if (pid.dptr != NULL) {
-		/* bundle ID exists, see if the pppd record still exists */
+		/* bundle ID exists, see if the pppd record exists */
 		rec = tdb_fetch(pppdb, pid);
-		if (rec.dptr != NULL) {
-			/* it is, parse the interface number */
-			p = strstr(rec.dptr, "IFNAME=ppp");
-			if (p != 0) {
-				p += 10;	/* skip to unit number */
-				i = strtol(p, &endp, 10);
-				if (endp != p && (*endp == 0 || *endp == ';'))
-					unit = i;
-			}
+		if (rec.dptr != NULL && rec.dsize > 0) {
+			/* make sure the string is null-terminated */
+			rec.dptr[rec.dsize-1] = 0;
+			/* parse the interface number */
+			parse_num(rec.dptr, "IFNAME=ppp", &unit);
+			/* check the pid value */
+			if (!parse_num(rec.dptr, "PPPD_PID=", &pppd_pid)
+			    || !process_exists(pppd_pid)
+			    || !owns_unit(pid, unit))
+				unit = -1;
 			free(rec.dptr);
 		}
 		free(pid.dptr);
@@ -148,9 +218,11 @@ mp_join_bundle()
 	if (unit >= 0) {
 		/* attach to existing unit */
 		if (bundle_attach(unit)) {
-			info("attached link to interface %d", ifunit);
 			set_ifunit(0);
 			script_setenv("BUNDLE", bundle_id + 7, 0);
+			make_bundle_links(1);
+			unlock_db();
+			info("Link attached to %s", ifname);
 			return 1;
 		}
 		/* attach failed because bundle doesn't exist */
@@ -159,10 +231,207 @@ mp_join_bundle()
 	/* we have to make a new bundle */
 	make_new_bundle(go->mrru, ho->mrru, go->neg_ssnhf, ho->neg_ssnhf);
 	set_ifunit(1);
+	netif_set_mtu(0, mtu);
 	script_setenv("BUNDLE", bundle_id + 7, 1);
+	make_bundle_links(0);
+	unlock_db();
+	info("New bundle %s created", ifname);
+	multilink_master = 1;
+	return 0;
+}
+
+void mp_exit_bundle()
+{
+	lock_db();
+	remove_bundle_link();
+	unlock_db();
+}
+
+static void sendhup(char *str)
+{
+	int pid;
+
+	if (parse_num(str, "PPPD_PID=", &pid) && pid != getpid()) {
+		if (debug)
+			dbglog("sending SIGHUP to process %d", pid);
+		kill(pid, SIGHUP);
+	}
+}
+
+void mp_bundle_terminated()
+{
+	TDB_DATA key;
+
+	bundle_terminating = 1;
+	upper_layers_down(0);
+	notice("Connection terminated.");
+	print_link_stats();
+	if (!demand) {
+		remove_pidfiles();
+		script_unsetenv("IFNAME");
+	}
+
+	lock_db();
+	destroy_bundle();
+	iterate_bundle_links(sendhup);
+	key.dptr = blinks_id;
+	key.dsize = strlen(blinks_id);
+	tdb_delete(pppdb, key);
+	unlock_db();
+
+	new_phase(PHASE_DEAD);
+
+	doing_multilink = 0;
+	multilink_master = 0;
+}
+
+static void make_bundle_links(int append)
+{
+	TDB_DATA key, rec;
+	char *p;
+	char entry[32];
+	int l;
+
+	key.dptr = blinks_id;
+	key.dsize = strlen(blinks_id);
+	slprintf(entry, sizeof(entry), "%s;", db_key);
+	p = entry;
+	if (append) {
+		rec = tdb_fetch(pppdb, key);
+		if (rec.dptr != NULL && rec.dsize > 0) {
+			rec.dptr[rec.dsize-1] = 0;
+			if (strstr(rec.dptr, db_key) != NULL) {
+				/* already in there? strange */
+				warn("link entry already exists in tdb");
+				return;
+			}
+			l = rec.dsize + strlen(entry);
+			p = malloc(l);
+			if (p == NULL)
+				novm("bundle link list");
+			slprintf(p, l, "%s%s", rec.dptr, entry);
+		} else {
+			warn("bundle link list not found");
+		}
+		if (rec.dptr != NULL)
+			free(rec.dptr);
+	}
+	rec.dptr = p;
+	rec.dsize = strlen(p) + 1;
+	if (tdb_store(pppdb, key, rec, TDB_REPLACE))
+		error("couldn't %s bundle link list",
+		      append? "update": "create");
+	if (p != entry)
+		free(p);
+}
+
+static void remove_bundle_link()
+{
+	TDB_DATA key, rec;
+	char entry[32];
+	char *p, *q;
+	int l;
+
+	key.dptr = blinks_id;
+	key.dsize = strlen(blinks_id);
+	slprintf(entry, sizeof(entry), "%s;", db_key);
+
+	rec = tdb_fetch(pppdb, key);
+	if (rec.dptr == NULL || rec.dsize <= 0) {
+		if (rec.dptr != NULL)
+			free(rec.dptr);
+		return;
+	}
+	rec.dptr[rec.dsize-1] = 0;
+	p = strstr(rec.dptr, entry);
+	if (p != NULL) {
+		q = p + strlen(entry);
+		l = strlen(q) + 1;
+		memmove(p, q, l);
+		rec.dsize = p - rec.dptr + l;
+		if (tdb_store(pppdb, key, rec, TDB_REPLACE))
+			error("couldn't update bundle link list (removal)");
+	}
+	free(rec.dptr);
+}
+
+static void iterate_bundle_links(void (*func)(char *))
+{
+	TDB_DATA key, rec, pp;
+	char *p, *q;
+
+	key.dptr = blinks_id;
+	key.dsize = strlen(blinks_id);
+	rec = tdb_fetch(pppdb, key);
+	if (rec.dptr == NULL || rec.dsize <= 0) {
+		error("bundle link list not found (iterating list)");
+		if (rec.dptr != NULL)
+			free(rec.dptr);
+		return;
+	}
+	p = rec.dptr;
+	p[rec.dsize-1] = 0;
+	while ((q = strchr(p, ';')) != NULL) {
+		*q = 0;
+		key.dptr = p;
+		key.dsize = q - p;
+		pp = tdb_fetch(pppdb, key);
+		if (pp.dptr != NULL && pp.dsize > 0) {
+			pp.dptr[pp.dsize-1] = 0;
+			func(pp.dptr);
+		}
+		if (pp.dptr != NULL)
+			free(pp.dptr);
+		p = q + 1;
+	}
+	free(rec.dptr);
+}
+
+static int
+parse_num(str, key, valp)
+     char *str;
+     const char *key;
+     int *valp;
+{
+	char *p, *endp;
+	int i;
+
+	p = strstr(str, key);
+	if (p != 0) {
+		p += strlen(key);
+		i = strtol(p, &endp, 10);
+		if (endp != p && (*endp == 0 || *endp == ';')) {
+			*valp = i;
+			return 1;
+		}
+	}
 	return 0;
 }
 
+/*
+ * Check whether the pppd identified by `key' still owns ppp unit `unit'.
+ */
+static int
+owns_unit(key, unit)
+     TDB_DATA key;
+     int unit;
+{
+	char ifkey[32];
+	TDB_DATA kd, vd;
+	int ret = 0;
+
+	slprintf(ifkey, sizeof(ifkey), "IFNAME=ppp%d", unit);
+	kd.dptr = ifkey;
+	kd.dsize = strlen(ifkey);
+	vd = tdb_fetch(pppdb, kd);
+	if (vd.dptr != NULL) {
+		ret = vd.dsize == key.dsize
+			&& memcmp(vd.dptr, key.dptr, vd.dsize) == 0;
+		free(vd.dptr);
+	}
+	return ret;
+}
+
 static int
 get_default_epdisc(ep)
      struct epdisc *ep;
@@ -292,12 +561,10 @@ str_to_epdisc(ep, str)
 		if (i == 0 || str[i] != 0)
 			return 0;
 		set_ip_epdisc(ep, addr);
-		dbglog("str_to_epdisc -> %s", epdisc_to_str(ep));
 		return 1;
 	}
 	if (i == EPD_MAC && get_if_hwaddr(ep->value, str) >= 0) {
 		ep->length = 6;
-		dbglog("str_to_epdisc -> %s", epdisc_to_str(ep));
 		return 1;
 	}
 
@@ -320,6 +587,6 @@ str_to_epdisc(ep, str)
 	if (*str != 0 || (ep->class == EPD_MAC && l != 6))
 		return 0;
 	ep->length = l;
-	dbglog("str_to_epdisc -> %s", epdisc_to_str(ep));
 	return 1;
 }
+