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improved load balancing algorithm.
[l2tpns.git] / l2tplac.c
diff --git a/l2tplac.c b/l2tplac.c
index 7fa8e87..fd3a7e0 100644 (file)
--- a/l2tplac.c
+++ b/l2tplac.c
@@ -1,15 +1,22 @@
 /*
+ * Fernando ALVES 2013
  * Add functionality "LAC" to l2tpns.
  * Used to forward a ppp session to another "LNS".
+ * GPL licenced
  */
+
 #include <errno.h>
 #include <string.h>
+#include <sys/socket.h>
+#include <linux/rtnetlink.h>
 
 #include "md5.h"
 #include "l2tpns.h"
 #include "util.h"
+#include "cluster.h"
 
 #include "l2tplac.h"
+#include "pppoe.h"
 
 /* sequence diagram: Client <--> LAC <--> LNS1 <--> LNS2
  *
@@ -196,7 +203,8 @@ int lac_rad_select_assignment_id(sessionidt s, char *assignment_id)
        if (nbtagfound > 0)
        {
                // random between 0 and nbtagfound-1
-               idtag = (nbtagfound*rand()/(RAND_MAX+1.0));
+               idtag = (rand() % nbtagfound);
+
                if (idtag >= nbtagfound)
                        idtag = 0; //Sanity checks.
 
@@ -226,13 +234,16 @@ void lac_save_rad_tag_tunnels(sessionidt s)
                        LOG(1, s, session[s].tunnel, "Error, Bad IP tunnel server endpoint \n");
                else if (strlen(ptunnelrlns[idtag].tunnel_assignment_id) <= 0)
                        LOG(1, s, session[s].tunnel, "Error, No tunnel_assignment_id \n");
+               else if (ptunnelrlns[idtag].tunnel_server_endpoint == ntohl(config->bind_address))
+                       LOG(0, s, session[s].tunnel, "Error, IP Remote LNS == IP local bind address (%s) !!!\n", fmtaddr(config->bind_address, 0));
                else
+               {
                        for (idrlns = 1; idrlns < MAXRLNSTUNNEL; ++idrlns)
                        {
                                if (pconfigrlns[idrlns].state == CONFRLNSFREE)
                                {
                                        pconfigrlns[idrlns].ip = ptunnelrlns[idtag].tunnel_server_endpoint;
-                                       pconfigrlns[idrlns].port = L2TPPORT; //Default L2TP poart
+                                       pconfigrlns[idrlns].port = L2TPPORT; //Default L2TP port
                                        strcpy(pconfigrlns[idrlns].l2tp_secret, ptunnelrlns[idtag].tunnel_password);
                                        strcpy(pconfigrlns[idrlns].tunnel_assignment_id, ptunnelrlns[idtag].tunnel_assignment_id);
 
@@ -247,7 +258,6 @@ void lac_save_rad_tag_tunnels(sessionidt s)
                                        if ( (pconfigrlns[idrlns].ip == ptunnelrlns[idtag].tunnel_server_endpoint) &&
                                                 (strcmp(pconfigrlns[idrlns].tunnel_assignment_id, ptunnelrlns[idtag].tunnel_assignment_id) == 0) )
                                        {
-                                               LOG(3, s, session[s].tunnel, "Tunnel IP %s already defined\n", fmtaddr(htonl(pconfigrlns[idrlns].ip), 0));
                                                // l2tp_secret may be changed
                                                strcpy(pconfigrlns[idrlns].l2tp_secret, ptunnelrlns[idtag].tunnel_password);
                                                pconfigrlns[idrlns].port = L2TPPORT; //Default L2TP poart
@@ -259,10 +269,11 @@ void lac_save_rad_tag_tunnels(sessionidt s)
                                }
                        }
 
-               if (idrlns >= MAXRLNSTUNNEL)
-               {
-                       LOG(0, s, session[s].tunnel, "No more Remote LNS Conf Free\n");
-                       return;
+                       if (idrlns >= MAXRLNSTUNNEL)
+                       {
+                               LOG(0, s, session[s].tunnel, "No more Remote LNS Conf Free\n");
+                               return;
+                       }
                }
        }
 }
@@ -286,6 +297,7 @@ static int lac_create_tunnelsession(tunnelidt t, sessionidt s, confrlnsidt i_con
                tunnel[t].port = pconfigrlns[i_conf].port;
                tunnel[t].window = 4; // default window
                tunnel[t].isremotelns = i_conf;
+               tunnel[t].indexudp = config->indexlacudpfd;
                STAT(tunnel_created);
 
                random_data(pconfigrlns[i_conf].auth, sizeof(pconfigrlns[i_conf].auth));
@@ -440,7 +452,7 @@ void lac_calc_rlns_auth(tunnelidt t, uint8_t id, uint8_t *out)
 }
 
 // Forward session to LAC or Remote LNS
-int lac_session_forward(uint8_t *buf, int len, sessionidt sess, uint16_t proto)
+int lac_session_forward(uint8_t *buf, int len, sessionidt sess, uint16_t proto, in_addr_t s_addr, int sin_port, uint16_t indexudpfd)
 {
        uint16_t t = 0, s = 0;
        uint8_t *p = buf + 2; // First word L2TP options
@@ -461,10 +473,29 @@ int lac_session_forward(uint8_t *buf, int len, sessionidt sess, uint16_t proto)
 
        if ((!tunnel[t].isremotelns) && (!tunnel[session[sess].tunnel].isremotelns))
        {
-               LOG(0, sess, session[sess].tunnel, "Link Tunnel Session (%u) broken\n", s);
+               LOG(0, sess, session[sess].tunnel, "Link Tunnel Session (%u/%u) broken\n", s, t);
                return 0;
        }
 
+       if (!config->cluster_iam_master)
+       {
+               if ( (proto == PPPIPCP) || (proto == PPPLCP) ||
+                        (proto == PPPPAP) || (proto == PPPCHAP) ||
+                        (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0]) ||
+                        (proto == PPPCCP) )
+               {
+                       session[sess].last_packet = time_now;
+                       master_forward_packet(buf, len, s_addr, sin_port, indexudpfd);
+                       return 1;
+               }
+       }
+
+       if (t == TUNNEL_ID_PPPOE)
+       {
+               pppoe_forwardto_session_pppoe(buf, len, sess, proto);
+               return 1;
+       }
+
        if (*buf & 0x40)
        {       // length
                p += 2;
@@ -569,8 +600,9 @@ int lac_cli_show_remotelns(confrlnsidt idrlns, char *strout)
 
        if (idrlns == 0)
                // Show Summary
-               sprintf(strout, "%15s %-32s %-32s %11s %7s %10s",
+               sprintf(strout, "%15s %3s  %-32s %-32s %11s %7s %10s",
                                "IP Remote LNS",
+                               "TID",
                                "l2tp secret",
                                "assignment Id",
                                "File/Radius",
@@ -578,7 +610,7 @@ int lac_cli_show_remotelns(confrlnsidt idrlns, char *strout)
                                "Count Sess");
        else
        {
-               tunnelidt t;
+               tunnelidt t, tfound = 0;
                sessionidt s;
                int countsess = 0;
                char state[20];
@@ -586,29 +618,27 @@ int lac_cli_show_remotelns(confrlnsidt idrlns, char *strout)
                strcpy(state, "Close");
                for (t = 0; t <= config->cluster_highest_tunnelid ; ++t)
                {
-                       if ((tunnel[t].isremotelns) &&
+                       if ((tunnel[t].isremotelns == idrlns) &&
                                (tunnel[t].ip == pconfigrlns[idrlns].ip) &&
                                (tunnel[t].port == pconfigrlns[idrlns].port) &&
                                (tunnel[t].state != TUNNELDIE))
                        {
-                               if (tunnel[t].isremotelns)
-                               {
-                                       if (tunnel[t].state == TUNNELOPENING)
-                                               strcpy(state, "Opening");
-                                       else if (tunnel[t].state == TUNNELOPEN)
-                                               strcpy(state, "Open");
-
-                                       for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
-                                               if (session[s].tunnel == t)
-                                                       countsess++;
-
-                                       break;
-                               }
+                               if (tunnel[t].state == TUNNELOPENING)
+                                       strcpy(state, "Opening");
+                               else if (tunnel[t].state == TUNNELOPEN)
+                                       strcpy(state, "Open");
+
+                               for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
+                                       if (session[s].tunnel == t)
+                                               countsess++;
+                               tfound = t;
+                               break;
                        }
                }
 
-               sprintf(strout, "%15s %-32s %-32s %11s %7s %10u",
+               sprintf(strout, "%15s %3u  %-32s %-32s %11s %7s %10u",
                                fmtaddr(htonl(pconfigrlns[idrlns].ip), 0),
+                               tfound,
                                pconfigrlns[idrlns].l2tp_secret,
                                pconfigrlns[idrlns].tunnel_assignment_id,
                                (pconfigrlns[idrlns].state == CONFRLNSSET?"File":(pconfigrlns[idrlns].state == CONFRLNSSETBYRADIUS?"Radius":"Free")),
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"