Fix cluster group update

[l2tpns.git] / ppp.c

diff --git a/ppp.c b/ppp.c
index 9661d5c..c8e128e 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -5,6 +5,9 @@
 #include <unistd.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
 #include <stdlib.h>

+#include <sys/socket.h>
+#include <linux/rtnetlink.h>
+

 #include "l2tpns.h"
 #include "constants.h"
 #include "plugin.h"
 #include "l2tpns.h"
 #include "constants.h"
 #include "plugin.h"


@@ -12,6 +15,9 @@
 #include "tbf.h"
 #include "cluster.h"
 
 #include "tbf.h"
 #include "cluster.h"
 

+#include "l2tplac.h"
+#include "pppoe.h"
+

 extern tunnelt *tunnel;
 extern bundlet *bundle;
 extern fragmentationt *frag;
 extern tunnelt *tunnel;
 extern bundlet *bundle;
 extern fragmentationt *frag;


@@ -21,6 +27,7 @@ extern int tunfd;
 extern char hostname[];
 extern uint32_t eth_tx;
 extern time_t time_now;
 extern char hostname[];
 extern uint32_t eth_tx;
 extern time_t time_now;

+extern uint64_t time_now_ms;

 extern configt *config;
 
 static int add_lcp_auth(uint8_t *b, int size, int authtype);
 extern configt *config;
 
 static int add_lcp_auth(uint8_t *b, int size, int authtype);


@@ -99,6 +106,12 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                LOG(3, s, t, "PAP login %s/%s\n", user, pass);
        }
 
                LOG(3, s, t, "PAP login %s/%s\n", user, pass);
        }
 

+       if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, user))
+       {
+               // Creating a tunnel/session has been started
+               return;
+       }
+

        if (session[s].ip || !(r = radiusnew(s)))
        {
                // respond now, either no RADIUS available or already authenticated
        if (session[s].ip || !(r = radiusnew(s)))
        {
                // respond now, either no RADIUS available or already authenticated


@@ -250,6 +263,14 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                packet.username = calloc(l + 1, 1);
                memcpy(packet.username, p, l);
 
                packet.username = calloc(l + 1, 1);
                memcpy(packet.username, p, l);
 

+               if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, packet.username))
+               {
+                       free(packet.username);
+                       free(packet.password);
+                       // Creating a tunnel/session has been started
+                       return;
+               }
+

                run_plugins(PLUGIN_PRE_AUTH, &packet);
                if (!packet.continue_auth)
                {
                run_plugins(PLUGIN_PRE_AUTH, &packet);
                if (!packet.continue_auth)
                {


@@ -402,7 +423,7 @@ void lcp_open(sessionidt s, tunnelidt t)
        }
 }
 
        }
 }
 

-static void lcp_restart(sessionidt s)
+void lcp_restart(sessionidt s)

 {
        session[s].ppp.phase = Establish;
        // This-Layer-Down
 {
        session[s].ppp.phase = Establish;
        // This-Layer-Down


@@ -535,7 +556,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        if (session[s].die) // going down...
                return;
 
        if (session[s].die) // going down...
                return;
 

-       LOG((*p == EchoReq || *p == EchoReply) ? 4 : 3, s, t,
+       LOG(((*p == EchoReq || *p == EchoReply) ? 4 : 3), s, t,

                "LCP: recv %s\n", ppp_code(*p));
 
        if (config->debug > 3) dumplcp(p, l);
                "LCP: recv %s\n", ppp_code(*p));
 
        if (config->debug > 3) dumplcp(p, l);


@@ -1180,24 +1201,24 @@ static void setepdis(epdist *ep1, epdist ep2)
 
 static bundleidt new_bundle()
 {
 
 static bundleidt new_bundle()
 {

-        bundleidt i;
-        for (i = 1; i < MAXBUNDLE; i++)
-        {
-                if (bundle[i].state == BUNDLEFREE)
-                {
-                        LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i);
-                        bundle[i].num_of_links = 1;
-                        bundle[i].last_check = time_now;        // Initialize last_check value
-                        bundle[i].state = BUNDLEOPEN;
-                        bundle[i].current_ses = -1;     // This is to enforce the first session 0 to be used at first
+       bundleidt i;
+       for (i = 1; i < MAXBUNDLE; i++)
+       {
+               if (bundle[i].state == BUNDLEFREE)
+               {
+                       LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i);
+                       bundle[i].num_of_links = 1;
+                       bundle[i].last_check = time_now;        // Initialize last_check value
+                       bundle[i].state = BUNDLEOPEN;
+                       bundle[i].current_ses = -1;     // This is to enforce the first session 0 to be used at first

                        memset(&frag[i], 0, sizeof(fragmentationt));
                        memset(&frag[i], 0, sizeof(fragmentationt));

-                        if (i > config->cluster_highest_bundleid)
-                                config->cluster_highest_bundleid = i;
-                        return i;
-                }
-        }
-        LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n");
-        return 0;
+                       if (i > config->cluster_highest_bundleid)
+                                       config->cluster_highest_bundleid = i;
+                       return i;
+               }
+       }
+       LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n");
+       return 0;

 }
 
 static void ipcp_open(sessionidt s, tunnelidt t)
 }
 
 static void ipcp_open(sessionidt s, tunnelidt t)


@@ -1745,7 +1766,7 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME: 
        {
                // no spoof (do sessionbyip to handled statically routed subnets)
        if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME: 
        {
                // no spoof (do sessionbyip to handled statically routed subnets)

-               if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
+               if (!config->disable_no_spoof && ip != session[s].ip && sessionbyip(htonl(ip)) != s)

                {
                        LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
                        return;
                {
                        LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
                        return;


@@ -1820,7 +1841,7 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        uint32_t seq_num, seq_num_next, seq_num_prev;
        uint32_t i;
        uint8_t flags = *p;
        uint32_t seq_num, seq_num_next, seq_num_prev;
        uint32_t i;
        uint8_t flags = *p;

-       uint16_t begin_index, end_index, start_index;
+       uint16_t begin_index, end_index;

 
        // Perform length checking
        if(l > MAXFRAGLEN)
 
        // Perform length checking
        if(l > MAXFRAGLEN)


@@ -1873,308 +1894,323 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
        // calculate this fragment's offset from the begin seq in the bundle
        frag_offset = (int) (seq_num - this_fragmentation->start_seq);
 
        // calculate this fragment's offset from the begin seq in the bundle
        frag_offset = (int) (seq_num - this_fragmentation->start_seq);

-       start_index = this_fragmentation->start_index;

        
        sess_local[s].last_seq = seq_num;
 
        
        sess_local[s].last_seq = seq_num;
 

-       uint32_t min;
+       // calculate the jitter average
+       uint32_t ljitter = time_now_ms - sess_local[s].prev_time;
+       if (ljitter > 0)
+       {
+               sess_local[s].jitteravg = (sess_local[s].jitteravg + ljitter)>>1;
+               sess_local[s].prev_time = time_now_ms;
+       }
+
+       uint32_t Mmin;

 
        if (seq_num < this_fragmentation->M)
        {
 
        if (seq_num < this_fragmentation->M)
        {

-               min = seq_num;
+               Mmin = seq_num;

                this_fragmentation->M = seq_num;
        }
        else
        {
                this_fragmentation->M = seq_num;
        }
        else
        {

-               min = sess_local[(this_bundle->members[0])].last_seq;
+               Mmin = sess_local[(this_bundle->members[0])].last_seq;

                for (i = 1; i < this_bundle->num_of_links; i++)
                {
                        uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq;
                for (i = 1; i < this_bundle->num_of_links; i++)
                {
                        uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq;

-                       if (s_seq < min)
-                               min = s_seq;
+                       if (s_seq < Mmin)
+                               Mmin = s_seq;

                }
                }

-               this_fragmentation->M = min;
+               this_fragmentation->M = Mmin;

        }
 
        }
 

-       if (min >= (this_fragmentation->start_seq + this_bundle->num_of_links))
-       {
-               // Find the new start sequence, the previous frag are lost
-               // calculate M offset of the M seq in the bundle
-               int M_offset = (int) (min - this_fragmentation->start_seq);
-               begin_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
+       // calculate M offset of the M seq in the bundle
+       int M_offset = (int) (Mmin - this_fragmentation->start_seq);

 
 

-               if (M_offset >= MAXFRAGNUM)
-               {
-                       // There have a long break of the link !!!!!!!!
-                       // M_offset is bigger that the fragmentation buffer size
-                       LOG(3, s, t, "MPPP: M_offset out of range, min:%d, begin_seq:%d, size frag:%d\n", min, this_fragmentation->start_seq, l);
-
-                       // Set new Start sequence
-                       this_fragmentation->start_index = begin_index;
-                       this_fragmentation->start_seq = min;
-                       M_offset = 0;
-                       // recalculate the fragment offset from the new begin seq in the bundle
-                       frag_offset = (int) (seq_num - min);
-               }
-               else if (M_offset > 0)
-               {
-                       uint32_t b_seq = min;
-                       if (min == seq_num)
-                       {
-                               if (begin_frame)
-                               {
-                                       // Set new Start sequence
-                                       this_fragmentation->start_index = begin_index;
-                                       this_fragmentation->start_seq = min;
-                                       frag_offset = 0;
-                               }
-                       }
-                       else
-                       {
-                               // Find the Begin sequence
-                               while (this_fragmentation->fragment[begin_index].length)
-                               {
-                                       if (b_seq == this_fragmentation->fragment[begin_index].seq)
-                                       {
-                                               if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
-                                                       break;
-                                       }
-                                       else
-                                       {
-                                               // This fragment is lost, it was never completed the packet.
-                                               LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
-                                                       "MPPP: (FIND) seq_num:%d frag_index:%d flags:%d is LOST\n",
-                                                       this_fragmentation->fragment[begin_index].seq, begin_index, this_fragmentation->fragment[begin_index].flags);
-                                               // this frag is lost
-                                               this_fragmentation->fragment[begin_index].length = 0;
-                                               this_fragmentation->fragment[begin_index].flags = 0;
-                                               break;
-                                       }
-                                       begin_index = (begin_index ? (begin_index -1) : (MAXFRAGNUM -1));
-                                       b_seq--;
-                               }
-
-                               // begin sequence found ?
-                               if (this_fragmentation->fragment[begin_index].length)
-                               {
-                                       // Set new Start sequence
-                                       this_fragmentation->start_index = begin_index;
-                                       this_fragmentation->start_seq = b_seq;
-                                       // recalculate the fragment offset from the new begin seq in the bundle
-                                       frag_offset = (int) (seq_num - b_seq);
-                               }
-                       }
-               }
-       }
-       else if ((this_fragmentation->fragment[start_index].length) &&
-                        (!(this_fragmentation->fragment[start_index].flags & MP_BEGIN)))
+       if (M_offset >= MAXFRAGNUM)

        {
        {

-               uint32_t f_seq = this_fragmentation->start_seq;
-               end_index = start_index;
-               // Find the Begin sequence
-               while (this_fragmentation->fragment[end_index].length)
-               {
-                       if (f_seq == this_fragmentation->fragment[end_index].seq)
-                       {
-                               if (this_fragmentation->fragment[end_index].flags & MP_BEGIN)
-                                       break;
-                       }
-                       else
-                       {
-                               // This fragment is lost, it was never completed the packet.
-                               LOG(3, this_fragmentation->fragment[end_index].sid, this_fragmentation->fragment[end_index].tid,
-                                       "MPPP: (FIND2) seq_num:%d frag_index:%d flags:%d is LOST\n",
-                                       this_fragmentation->fragment[end_index].seq, end_index, this_fragmentation->fragment[end_index].flags);
-                               // this frag is lost
-                               this_fragmentation->fragment[end_index].length = 0;
-                               this_fragmentation->fragment[end_index].flags = 0;
-                               break;
-                       }
-                       end_index = (end_index +1) & MAXFRAGNUM_MASK;
-                       f_seq++;
-               }
+               // There have a long break of the link !!!!!!!!
+               // M_offset is bigger that the fragmentation buffer size
+               LOG(3, s, t, "MPPP: M_offset out of range, min:%d, begin_seq:%d\n", Mmin, this_fragmentation->start_seq);
+
+               // Calculate the new start index, the previous frag are lost
+               begin_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;

 
                // Set new Start sequence
 
                // Set new Start sequence

-               this_fragmentation->start_index = end_index;
-               this_fragmentation->start_seq = f_seq;
+               this_fragmentation->start_index = begin_index;
+               this_fragmentation->start_seq = Mmin;
+               M_offset = 0;

                // recalculate the fragment offset from the new begin seq in the bundle
                // recalculate the fragment offset from the new begin seq in the bundle

-               frag_offset = (int) (seq_num - f_seq);
+               frag_offset = (int) (seq_num - Mmin);

        }
 
        // discard this fragment if the packet comes before the start sequence
        if (frag_offset < 0)
        {
                // this packet comes before the next
        }
 
        // discard this fragment if the packet comes before the start sequence
        if (frag_offset < 0)
        {
                // this packet comes before the next

-               LOG(3, s, t, "MPPP: packet comes before the next, seq:%d, begin_seq:%d, size frag:%d\n", seq_num, this_fragmentation->start_seq, l);
+               LOG(3, s, t, "MPPP: (COMES BEFORE) the next, seq:%d, begin_seq:%d, size_frag:%d, flags:%02X is LOST\n", seq_num, this_fragmentation->start_seq, l, flags);

                return;
        }
                return;
        }

-       
+

        // discard if frag_offset is bigger that the fragmentation buffer size
        if (frag_offset >= MAXFRAGNUM)
        {
                // frag_offset is bigger that the fragmentation buffer size
        // discard if frag_offset is bigger that the fragmentation buffer size
        if (frag_offset >= MAXFRAGNUM)
        {
                // frag_offset is bigger that the fragmentation buffer size

-               LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d, size frag:%d\n", seq_num, this_fragmentation->start_seq, l);
+               LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d\n", seq_num, this_fragmentation->start_seq);

                return;
        }
 
        //caculate received fragment's index in the fragment array
        frag_index = (frag_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
 
                return;
        }
 
        //caculate received fragment's index in the fragment array
        frag_index = (frag_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
 

-       {
-               // insert the frame in it's place
-               fragmentt *this_frag = &this_fragmentation->fragment[frag_index];
-
-               if (this_frag->length > 0)
+       // insert the frame in it's place
+       fragmentt *this_frag = &this_fragmentation->fragment[frag_index];
+
+       if (this_frag->length > 0)
+               // This fragment is lost, It was around the buffer and it was never completed the packet.
+               LOG(3, this_frag->sid, this_frag->tid, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%02X is LOST\n",
+                       this_frag->seq, frag_index, this_frag->flags);
+
+       this_frag->length = l;
+       this_frag->sid = s;
+       this_frag->tid = t;
+       this_frag->flags = flags;
+       this_frag->seq = seq_num;
+       this_frag->jitteravg = sess_local[s].jitteravg;
+       memcpy(this_frag->data, p, l);
+
+       LOG(4, s, t, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n",  seq_num, frag_index, flags);
+
+       //next frag index
+       frag_index_next = (frag_index + 1) & MAXFRAGNUM_MASK;
+       //previous frag index
+       frag_index_prev = (frag_index - 1) & MAXFRAGNUM_MASK;
+       // next seq
+       seq_num_next = seq_num + 1;
+       // previous seq
+       seq_num_prev = seq_num - 1;
+
+       // Clean the buffer and log the lost fragments
+       if ((frag_index_next != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_next].length)
+       {
+               // check if the next frag is a lost fragment
+               if (this_fragmentation->fragment[frag_index_next].seq != seq_num_next)
+               {

                        // This fragment is lost, It was around the buffer and it was never completed the packet.
                        // This fragment is lost, It was around the buffer and it was never completed the packet.

-                       LOG(3, this_frag->sid, this_frag->tid, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%d is LOST\n",
-                               this_frag->seq, frag_index, this_frag->flags);
-
-               this_frag->length = l;
-               this_frag->sid = s;
-               this_frag->flags = flags;
-               this_frag->seq = seq_num;
-               memcpy(this_frag->data, p, l);
-
-               LOG(4, s, t, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n",  seq_num, frag_index, flags);
-
-               //next frag index
-               frag_index_next = (frag_index + 1) & MAXFRAGNUM_MASK;
-               //previous frag index
-               frag_index_prev = (frag_index - 1) & MAXFRAGNUM_MASK;
-               // next seq
-               seq_num_next = seq_num + 1;
-               // previous seq
-               seq_num_prev = seq_num - 1;
-
-               if ((frag_index_next != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_next].length)
+                       LOG(3, this_fragmentation->fragment[frag_index_next].sid, this_fragmentation->fragment[frag_index_next].tid,
+                               "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%02X is LOST\n",
+                               this_fragmentation->fragment[frag_index_next].seq, frag_index_next,
+                               this_fragmentation->fragment[frag_index_next].flags);
+                       // this frag is lost
+                       this_fragmentation->fragment[frag_index_next].length = 0;
+                       this_fragmentation->fragment[frag_index_next].flags = 0;
+
+                       if (begin_frame && (!end_frame)) return; // assembling frame failed
+               }
+       }
+
+       // Clean the buffer and log the lost fragments
+       if ((frag_index != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_prev].length)
+       {
+               // check if the next frag is a lost fragment
+               if (this_fragmentation->fragment[frag_index_prev].seq != seq_num_prev)

                {
                {

-                       // check if the next frag is a lost fragment
-                       if (this_fragmentation->fragment[frag_index_next].seq != seq_num_next)
-                       {
-                               // This fragment is lost, It was around the buffer and it was never completed the packet.
-                               LOG(3, this_fragmentation->fragment[frag_index_next].sid, this_fragmentation->fragment[frag_index_next].tid,
-                                       "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%d is LOST\n",
-                                       this_fragmentation->fragment[frag_index_next].seq, frag_index_next, this_fragmentation->fragment[frag_index_next].flags);
-                               // this frag is lost
-                               this_fragmentation->fragment[frag_index_next].length = 0;
-                               this_fragmentation->fragment[frag_index_next].flags = 0;
+                       // This fragment is lost, It was around the buffer and it was never completed the packet.
+                       LOG(3, this_fragmentation->fragment[frag_index_prev].sid, this_fragmentation->fragment[frag_index_prev].tid,
+                               "MPPP: (PREV) seq_num:%d frag_index:%d flags:%02X is LOST\n",
+                               this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev,
+                               this_fragmentation->fragment[frag_index_prev].flags);

 
 

-                               if (begin_frame && (!end_frame)) return; // assembling frame failed
-                       }
+                       this_fragmentation->fragment[frag_index_prev].length = 0;
+                       this_fragmentation->fragment[frag_index_prev].flags = 0;
+
+                       if (end_frame && (!begin_frame)) return; // assembling frame failed

                }
                }

+       }

 
 

-               if ((frag_index != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_prev].length)
+find_frame:
+       begin_index = this_fragmentation->start_index;
+       uint32_t b_seq = this_fragmentation->start_seq;
+       // Try to find a Begin sequence from the start_seq sequence to M sequence
+       while (b_seq < Mmin)
+       {
+               if (this_fragmentation->fragment[begin_index].length)

                {
                {

-                       // check if the next frag is a lost fragment
-                       if (this_fragmentation->fragment[frag_index_prev].seq != seq_num_prev)
+                       if (b_seq == this_fragmentation->fragment[begin_index].seq)

                        {
                        {

-                               // This fragment is lost, It was around the buffer and it was never completed the packet.
-                               LOG(3, this_fragmentation->fragment[frag_index_prev].sid, this_fragmentation->fragment[frag_index_prev].tid,
-                                       "MPPP: (PREV) seq_num:%d frag_index:%d flags:%d is LOST\n",
-                                       this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev, this_fragmentation->fragment[frag_index_prev].flags);
-
-                               this_fragmentation->fragment[frag_index_prev].length = 0;
-                               this_fragmentation->fragment[frag_index_prev].flags = 0;
+                               if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
+                               {
+                                       int isfoundE = 0;
+                                       // Adjust the new start sequence and start index
+                                       this_fragmentation->start_index = begin_index;
+                                       this_fragmentation->start_seq = b_seq;
+                                       // Begin Sequence found, now try to found the End Sequence to complete the frame
+                                       end_index = begin_index;
+                                       while (b_seq < Mmin)
+                                       {
+                                               if (this_fragmentation->fragment[end_index].length)
+                                               {
+                                                       if (b_seq == this_fragmentation->fragment[end_index].seq)
+                                                       {
+                                                               if (this_fragmentation->fragment[end_index].flags & MP_END)
+                                                               {
+                                                                       // The End sequence was found and the frame is complete
+                                                                       isfoundE = 1;
+                                                                       break;
+                                                               }
+                                                       }
+                                                       else
+                                                       {
+                                                               // This fragment is lost, it was never completed the packet.
+                                                               LOG(3, this_fragmentation->fragment[end_index].sid, this_fragmentation->fragment[end_index].tid,
+                                                                       "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%02X is LOST\n",
+                                                                       this_fragmentation->fragment[end_index].seq, begin_index,
+                                                                       this_fragmentation->fragment[end_index].flags);
+                                                               // this frag is lost
+                                                               this_fragmentation->fragment[end_index].length = 0;
+                                                               this_fragmentation->fragment[end_index].flags = 0;
+                                                               // This frame is not complete find the next Begin
+                                                               break;
+                                                       }
+                                               }
+                                               else
+                                               {
+                                                       // This frame is not complete find the next Begin if exist
+                                                       break;
+                                               }
+                                               end_index = (end_index +1) & MAXFRAGNUM_MASK;
+                                               b_seq++;
+                                       }

 
 

-                               if (end_frame && (!begin_frame)) return; // assembling frame failed
+                                       if (isfoundE)
+                                               // The End sequence was found and the frame is complete
+                                               break;
+                                       else
+                                               // find the next Begin
+                                               begin_index = end_index;
+                               }
+                       }
+                       else
+                       {
+                               // This fragment is lost, it was never completed the packet.
+                               LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
+                                       "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%02X is LOST\n",
+                                       this_fragmentation->fragment[begin_index].seq, begin_index,
+                                       this_fragmentation->fragment[begin_index].flags);
+                               // this frag is lost
+                               this_fragmentation->fragment[begin_index].length = 0;
+                               this_fragmentation->fragment[begin_index].flags = 0;

                        }
                }
                        }
                }

+               begin_index = (begin_index +1) & MAXFRAGNUM_MASK;
+               b_seq++;
+       }

 
 assembling_frame:
 
 assembling_frame:

-               // try to assemble the frame that has the received fragment as a member         
-               // get the beginning of this frame
-               begin_index = end_index = this_fragmentation->start_index;
-               if (this_fragmentation->fragment[begin_index].length)
+       // try to assemble the frame that has the received fragment as a member
+       // get the beginning of this frame
+       begin_index = end_index = this_fragmentation->start_index;
+       if (this_fragmentation->fragment[begin_index].length)
+       {
+               if (!(this_fragmentation->fragment[begin_index].flags & MP_BEGIN))

                {
                {

-                       if (!(this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
-                               return; // assembling frame failed
-               }
-               else
+                       LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
+                               "MPPP: (NOT BEGIN) seq_num:%d frag_index:%d flags:%02X\n",
+                               this_fragmentation->fragment[begin_index].seq, begin_index,
+                               this_fragmentation->fragment[begin_index].flags);
+                       // should occur only after an "M_Offset out of range"
+                       // The start sequence must be a begin sequence
+                       this_fragmentation->start_index = (begin_index +1) & MAXFRAGNUM_MASK;
+                       this_fragmentation->start_seq++;

                        return; // assembling frame failed
                        return; // assembling frame failed

+               }
+       }
+       else
+               return; // assembling frame failed

 
 

-               // get the end of his frame
-               while (this_fragmentation->fragment[end_index].length)
-               {
-                       if (this_fragmentation->fragment[end_index].flags & MP_END)
-                               break;
-
-                       end_index = (end_index +1) & MAXFRAGNUM_MASK;
+       // get the end of his frame
+       while (this_fragmentation->fragment[end_index].length)
+       {
+               if (this_fragmentation->fragment[end_index].flags & MP_END)
+                       break;

 
 

-                       if (end_index == this_fragmentation->start_index)
-                               return; // assembling frame failed
-               }
+               end_index = (end_index +1) & MAXFRAGNUM_MASK;

 
 

-               // return if a lost fragment is found
-               if (!(this_fragmentation->fragment[end_index].length))
+               if (end_index == this_fragmentation->start_index)

                        return; // assembling frame failed
                        return; // assembling frame failed

+       }

 
 

-               // assemble the packet
-               //assemble frame, process it, reset fragmentation
-               uint16_t cur_len = 4;   // This is set to 4 to leave 4 bytes for function processipin
-
-               LOG(4, s, t, "MPPP: processing fragments from %d to %d\n", begin_index, end_index);
-               // Push to the receive buffer
+       // return if a lost fragment is found
+       if (!(this_fragmentation->fragment[end_index].length))
+               return; // assembling frame failed

 
 

-               for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
-               {
-                       this_frag = &this_fragmentation->fragment[i];
-                       if(cur_len + this_frag->length > MAXETHER)
-                       {
-                               LOG(2, s, t, "MPPP: discarding reassembled frames larger than MAXETHER\n");
-                               break;
-                       }
+       // assemble the packet
+       //assemble frame, process it, reset fragmentation
+       uint16_t cur_len = 4;   // This is set to 4 to leave 4 bytes for function processipin

 
 

-                       memcpy(this_fragmentation->reassembled_frame+cur_len, this_frag->data, this_frag->length);
-                       LOG(5, s, t, "MPPP: processing frame at %d, with len %d\n", i, this_frag->length);
+       LOG(4, s, t, "MPPP: processing fragments from %d to %d\n", begin_index, end_index);
+       // Push to the receive buffer

 
 

-                       cur_len += this_frag->length;
-                       if (i == end_index)
-                       {
-                               this_fragmentation->re_frame_len = cur_len;
-                               this_fragmentation->re_frame_begin_index = begin_index;
-                               this_fragmentation->re_frame_end_index = end_index;
-                               // Process the resassembled frame
-                               LOG(5, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len);
-                               processmpframe(s, t, this_fragmentation->reassembled_frame, this_fragmentation->re_frame_len, 1);
-                               break;
-                       }
+       for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
+       {
+               this_frag = &this_fragmentation->fragment[i];
+               if(cur_len + this_frag->length > MAXETHER)
+               {
+                       LOG(2, s, t, "MPPP: discarding reassembled frames larger than MAXETHER\n");
+                       break;

                }
 
                }
 

-               // Set reassembled frame length to zero after processing it
-               this_fragmentation->re_frame_len = 0;
-               for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
+               memcpy(this_fragmentation->reassembled_frame+cur_len, this_frag->data, this_frag->length);
+               LOG(5, s, t, "MPPP: processing frame at %d, with len %d\n", i, this_frag->length);
+
+               cur_len += this_frag->length;
+               if (i == end_index)

                {
                {

-                       this_fragmentation->fragment[i].length = 0;      // Indicates that this fragment has been consumed
-                       this_fragmentation->fragment[i].flags = 0;
-                       if (i == end_index)
-                               break;
+                       this_fragmentation->re_frame_len = cur_len;
+                       this_fragmentation->re_frame_begin_index = begin_index;
+                       this_fragmentation->re_frame_end_index = end_index;
+                       // Process the resassembled frame
+                       LOG(5, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len);
+                       processmpframe(s, t, this_fragmentation->reassembled_frame, this_fragmentation->re_frame_len, 1);
+                       break;

                }
                }

+       }

 
 

-               // Set the new start_index and start_seq
-               this_fragmentation->start_index = (end_index + 1) & MAXFRAGNUM_MASK;
-               this_fragmentation->start_seq = this_fragmentation->fragment[end_index].seq + 1;
+       // Set reassembled frame length to zero after processing it
+       this_fragmentation->re_frame_len = 0;
+       for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
+       {
+               this_fragmentation->fragment[i].length = 0;      // Indicates that this fragment has been consumed
+               this_fragmentation->fragment[i].flags = 0;
+               if (i == end_index)
+                       break;
+       }

 
 

-               LOG(4, s, t, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation->start_index, this_fragmentation->start_seq);
+       // Set the new start_index and start_seq
+       this_fragmentation->start_index = (end_index + 1) & MAXFRAGNUM_MASK;
+       this_fragmentation->start_seq = this_fragmentation->fragment[end_index].seq + 1;
+       LOG(4, s, t, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation->start_index, this_fragmentation->start_seq);

 
 

-               begin_index = this_fragmentation->start_index;
-               if (this_fragmentation->fragment[begin_index].length)
-               {
-                       if (this_fragmentation->fragment[begin_index].seq == this_fragmentation->start_seq)
-                       {
-                               if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
-                                       goto assembling_frame;
-                       }
-                       else
-                       {
-                               LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
-                                       "MPPP: START seq_num:%d frag_index:%d flags:%d is LOST\n",
-                                       this_fragmentation->fragment[begin_index].seq, begin_index, this_fragmentation->fragment[begin_index].flags);
-                               this_fragmentation->fragment[begin_index].length = 0;
-                               this_fragmentation->fragment[begin_index].flags = 0;
-                       }
-               }
+       begin_index = this_fragmentation->start_index;
+       if ((this_fragmentation->fragment[begin_index].length) &&
+               (this_fragmentation->fragment[begin_index].seq != this_fragmentation->start_seq))
+       {
+               LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
+                               "MPPP: (START) seq_num:%d frag_index:%d flags:%02X is LOST\n",
+                               this_fragmentation->fragment[begin_index].seq, begin_index,
+                               this_fragmentation->fragment[begin_index].flags);
+                       this_fragmentation->fragment[begin_index].length = 0;
+                       this_fragmentation->fragment[begin_index].flags = 0;

        }
 
        }
 

+       if (this_fragmentation->start_seq <= Mmin)
+               // It's possible to find other complete frame or lost frame.
+               goto find_frame;
+       else if ((this_fragmentation->fragment[begin_index].length) &&
+                         (this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
+               // may be that the next frame is completed
+               goto assembling_frame;
+

        return;
 }
 
        return;
 }
 


@@ -2487,6 +2523,11 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
        uint16_t type = mtype;
        uint8_t *start = b;
 
        uint16_t type = mtype;
        uint8_t *start = b;
 

+       if (t == TUNNEL_ID_PPPOE)
+       {
+               return pppoe_makeppp(b, size, p, l, s, t, mtype, prio, bid, mp_bits);
+       }
+

        if (size < 16) // Need more space than this!!
        {
                LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
        if (size < 16) // Need more space than this!!
        {
                LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);


@@ -2567,6 +2608,85 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
        return b;
 }
 
        return b;
 }
 

+// fill in a L2TP message with a PPP frame,
+// returns start of PPP frame
+//(note: THIS ROUTINE CAN WRITES TO p[-28]).
+uint8_t *opt_makeppp(uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits)
+{
+       uint16_t hdr = 0x0002; // L2TP with no options
+       uint16_t type = mtype;
+       uint8_t *b = p;
+
+       if (t == TUNNEL_ID_PPPOE)
+       {
+               return opt_pppoe_makeppp(p, l, s, t, mtype, prio, bid, mp_bits);
+       }
+
+       // Check whether this session is part of multilink
+       if (bid)
+       {
+               if (bundle[bid].num_of_links > 1)
+                       type = PPPMP; // Change PPP message type to the PPPMP
+               else
+                       bid = 0;
+       }
+
+       if (bid)
+       {
+               // Add the message type if this fragment has the begin bit set
+               if (mp_bits & MP_BEGIN)
+               {
+                       b -= 2;
+                       *(uint16_t *) b = htons(mtype); // Message type
+               }
+
+               // Set the sequence number and (B)egin (E)nd flags
+               if (session[s].mssf)
+               {
+                       // Set the multilink bits
+                       uint16_t bits_send = mp_bits;
+                       b -= 2;
+                       *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send);
+               }
+               else
+               {
+                       b -= 4;
+                       *(uint32_t *) b = htonl(bundle[bid].seq_num_t);
+                       // Set the multilink bits
+                       *b = mp_bits;
+               }
+
+               bundle[bid].seq_num_t++;
+       }
+
+       if (type < 0x100 && session[s].flags & SESSION_PFC)
+       {
+               b--;
+               *b = type;
+       }
+       else
+       {
+               b -= 2;
+               *(uint16_t *) b = htons(type);
+       }
+
+       if (type == PPPLCP || !(session[s].flags & SESSION_ACFC))
+       {
+               b -= 2;
+               *(uint16_t *) b = htons(0xFF03); // HDLC header
+       }
+
+       if (prio) hdr |= 0x0100; // set priority bit
+       b -= 2;
+       *(uint16_t *) b = htons(session[s].far); // session
+       b -= 2;
+       *(uint16_t *) b = htons(tunnel[t].far); // tunnel
+       b -= 2;
+       *(uint16_t *) b = htons(hdr);
+
+       return b;
+}
+

 static int add_lcp_auth(uint8_t *b, int size, int authtype)
 {
        int len = 0;
 static int add_lcp_auth(uint8_t *b, int size, int authtype)
 {
        int len = 0;