From 7fd68b1daeab9a2a1a3ee8f0652c25fc37bf3549 Mon Sep 17 00:00:00 2001
From: fendo <fendo@bi12info.com>
Date: Sun, 18 Nov 2012 16:04:06 +0100
Subject: [PATCH] Fix the inverted "delete/add" of the routes, in cluster mode.

---
 cluster.c        | 30 ++++++++++++++++++++++++++++++
 cluster.h        |  1 +
 debian/changelog |  6 ++++++
 l2tpns.c         | 42 +++++++++++++++++++++---------------------
 4 files changed, 58 insertions(+), 21 deletions(-)

diff --git a/cluster.c b/cluster.c
index b54ae0c..67d8d5e 100644
--- a/cluster.c
+++ b/cluster.c
@@ -1002,6 +1002,36 @@ static int type_changed(int type, int id)
 	return 1;
 }
 
+// The deleted session, must be before the new session
+int cluster_listinvert_session(int sidnew, int sidtodel)
+{
+	int i, inew = 0;
+
+	for (i = 0 ; i < config->cluster_num_changes ; ++i)
+	{
+		if ( cluster_changes[i].id == sidtodel && cluster_changes[i].type == C_CSESSION)
+			return 0;	// Deleted session already before the new session.
+
+		if ( cluster_changes[i].id == sidnew && cluster_changes[i].type == C_CSESSION)
+		{
+			inew = i;
+			break;
+		}
+	}
+
+	for ( ; i < config->cluster_num_changes ; ++i)
+	{
+		if ( cluster_changes[i].id == sidtodel && cluster_changes[i].type == C_CSESSION)
+		{
+			// Reverse position
+			cluster_changes[i].id = sidnew;
+			cluster_changes[inew].id = sidtodel;
+			return 1;
+		}
+	}
+
+	return 0;
+}
 
 // A particular session has been changed!
 int cluster_send_session(int sid)
diff --git a/cluster.h b/cluster.h
index faeede4..c1aa574 100644
--- a/cluster.h
+++ b/cluster.h
@@ -78,6 +78,7 @@ typedef struct {
 
 int cluster_init(void);
 int processcluster(uint8_t *buf, int size, in_addr_t addr);
+int cluster_listinvert_session(int sidnew, int sidtodel);
 int cluster_send_session(int sid);
 int cluster_send_bundle(int bid);
 int cluster_send_tunnel(int tid);
diff --git a/debian/changelog b/debian/changelog
index 07cfce3..2a41d76 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+l2tpns (2.2.1-2fdn2.1) unstable; urgency=low
+
+  * Fix the inverted "delete/add" of the routes, in cluster mode. 
+
+ -- Fernando Alves <fernando.alves@sameswireless.fr>  Sun, 18 Nov 2012 15:59:44 +0100
+
 l2tpns (2.2.1-2fdn2) unstable; urgency=low
 
   * merge from branch fendo-mods, MLPPP developments
diff --git a/l2tpns.c b/l2tpns.c
index 7478560..ed85a91 100644
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -5227,18 +5227,18 @@ int sessionsetup(sessionidt s, tunnelidt t)
 	LOG(3, s, t, "Doing session setup for session\n");
 
 	// Join a bundle if the MRRU option is accepted
-        if(session[s].mrru > 0 && session[s].bundle == 0)
-        {
-                LOG(3, s, t, "This session can be part of multilink bundle\n");
-                if (join_bundle(s) > 0)
-                	cluster_send_bundle(session[s].bundle);
+	if(session[s].mrru > 0 && session[s].bundle == 0)
+	{
+		LOG(3, s, t, "This session can be part of multilink bundle\n");
+		if (join_bundle(s) > 0)
+			cluster_send_bundle(session[s].bundle);
 		else
 		{
 			LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
 			sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
 			return 0;
 		}
-        }
+	}
 
 	if (!session[s].ip)
 	{
@@ -5253,7 +5253,6 @@ int sessionsetup(sessionidt s, tunnelidt t)
 			fmtaddr(htonl(session[s].ip), 0));
 	}
 
-
 	// Make sure this is right
 	session[s].tunnel = t;
 
@@ -5266,13 +5265,14 @@ int sessionsetup(sessionidt s, tunnelidt t)
 		for (i = 1; i <= config->cluster_highest_sessionid; i++)
 		{
 			if (i == s) continue;
-			if (!session[s].opened) continue;
+			if (!session[s].opened) break;
 			// Allow duplicate sessions for multilink ones of the same bundle.
-                        if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
-                                continue;
+			if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
+
 			if (ip == session[i].ip)
 			{
 				sessionkill(i, "Duplicate IP address");
+				cluster_listinvert_session(s, i);
 				continue;
 			}
 
@@ -5280,16 +5280,16 @@ int sessionsetup(sessionidt s, tunnelidt t)
 			if (session[s].walled_garden || session[i].walled_garden) continue;
 			// Guest change
 			int found = 0;
-                        int gu;
-                        for (gu = 0; gu < guest_accounts_num; gu++)
-                        {
-                                if (!strcasecmp(user, guest_users[gu]))
-                                {
-                                        found = 1;
-                                        break;
-                                }
-                        }
-                        if (found) continue;
+			int gu;
+			for (gu = 0; gu < guest_accounts_num; gu++)
+			{
+				if (!strcasecmp(user, guest_users[gu]))
+				{
+					found = 1;
+					break;
+				}
+			}
+			if (found) continue;
 
 			// Drop the new session in case of duplicate sessionss, not the old one.
 			if (!strcasecmp(user, session[i].user))
@@ -5300,7 +5300,7 @@ int sessionsetup(sessionidt s, tunnelidt t)
 	// no need to set a route for the same IP address of the bundle
 	if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
 	{
-	    	int routed = 0;
+		int routed = 0;
 
 		// Add the route for this session.
 		for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
-- 
2.20.1