new feature: If the user attribute "Framed-IPv6-Address" is defined then the ICMPv6_R...
[l2tpns.git] / ppp.c
diff --git a/ppp.c b/ppp.c
index c76d6da..21f5985 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -1,12 +1,12 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.103 2007-01-25 12:36:48 bodea Exp $";
-
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
 #include <stdlib.h>
+#include <netinet/ip6.h>
+#include "dhcp6.h"
 #include "l2tpns.h"
 #include "constants.h"
 #include "plugin.h"
@@ -14,6 +14,9 @@ char const *cvs_id_ppp = "$Id: ppp.c,v 1.103 2007-01-25 12:36:48 bodea Exp $";
 #include "tbf.h"
 #include "cluster.h"
 
+#include "l2tplac.h"
+#include "pppoe.h"
+
 extern tunnelt *tunnel;
 extern bundlet *bundle;
 extern fragmentationt *frag;
@@ -23,6 +26,7 @@ extern int tunfd;
 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);
@@ -31,6 +35,16 @@ static int epdiscmp(epdist, epdist);
 static void setepdis(epdist *, epdist);
 static void ipcp_open(sessionidt s, tunnelidt t);
 
+static int first_session_in_bundle(sessionidt s)
+{
+       bundleidt i;
+       for (i = 1; i < MAXBUNDLE; i++)
+               if (bundle[i].state != BUNDLEFREE)
+                       if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user))
+                               return 0;
+       return 1;       
+}
+
 // Process PAP messages
 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 {
@@ -91,6 +105,12 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                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
@@ -140,7 +160,10 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
                radius[r].id = p[1];
                LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass);
-               radiussend(r, RADIUSAUTH);
+               if ((session[s].mrru) && (!first_session_in_bundle(s)))
+                       radiussend(r, RADIUSJUSTAUTH);
+               else
+                       radiussend(r, RADIUSAUTH);
        }
 }
 
@@ -239,6 +262,14 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t 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)
                {
@@ -257,7 +288,10 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
        radius[r].chap = 1;
        LOG(3, s, t, "CHAP login %s\n", session[s].user);
-       radiussend(r, RADIUSAUTH);
+       if ((session[s].mrru) && (!first_session_in_bundle(s)))
+               radiussend(r, RADIUSJUSTAUTH);
+       else
+               radiussend(r, RADIUSAUTH);
 }
 
 static void dumplcp(uint8_t *p, int l)
@@ -366,17 +400,7 @@ void lcp_open(sessionidt s, tunnelidt t)
        }
        else
        {
-               if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
-               {
-                       sessionidt first_ses = bundle[session[s].bundle].members[0];
-                       LOG(3, s, t, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n", s, first_ses);
-                       session[s].ip = session[first_ses].ip;
-                       session[s].dns1 = session[first_ses].dns1;
-                       session[s].dns2 = session[first_ses].dns2;
-                       session[s].session_timeout = session[first_ses].session_timeout;
-                       ipcp_open(s, t);
-               }
-               else
+               if(session[s].bundle == 0 || bundle[session[s].bundle].num_of_links == 1)
                {
                        // This-Layer-Up
                        sendipcp(s, t);
@@ -389,10 +413,16 @@ void lcp_open(sessionidt s, tunnelidt t)
 
                        change_state(s, ccp, Stopped);
                }
+               else
+               {
+                       sessionidt first_ses = bundle[session[s].bundle].members[0];
+                       LOG(3, s, t, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n",s,first_ses);
+                       ipcp_open(s, t);
+                }
        }
 }
 
-static void lcp_restart(sessionidt s)
+void lcp_restart(sessionidt s)
 {
        session[s].ppp.phase = Establish;
        // This-Layer-Down
@@ -525,7 +555,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        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);
@@ -809,6 +839,10 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
                        break;
 
+               case Closing:
+                       sessionshutdown(s, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
+                       break;
+
                default:
                        LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
                        return;
@@ -1091,10 +1125,20 @@ int join_bundle(sessionidt s)
                {
                        if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user))
                        {
+                               sessionidt first_ses = bundle[i].members[0];
+                               if (bundle[i].mssf != session[s].mssf)
+                               {
+                                       // uniformity of sequence number format must be insured
+                                       LOG(3, s, session[s].tunnel, "MPPP: unable to bundle session %d in bundle %d cause of different mssf\n", s, i);
+                                       return -1;
+                               }
                                session[s].bundle = i;
-                               bundle[i].mrru = session[s].mrru;
-                               bundle[i].mssf = session[s].mssf;
-                               if (session[s].epdis.length > 0)
+                               session[s].ip = session[first_ses].ip;
+                               session[s].dns1 = session[first_ses].dns1;
+                               session[s].dns2 = session[first_ses].dns2;
+                               session[s].timeout = session[first_ses].timeout;
+
+                               if(session[s].epdis.length > 0)
                                        setepdis(&bundle[i].epdis, session[s].epdis);
 
                                strcpy(bundle[i].user, session[s].user);
@@ -1112,11 +1156,19 @@ int join_bundle(sessionidt s)
        session[s].bundle = b;
        bundle[b].mrru = session[s].mrru;
        bundle[b].mssf = session[s].mssf;
-       if (session[s].epdis.length > 0)
+       // FIXME !!! to enable l2tpns reading mssf frames receiver_max_seq, sender_max_seq must be introduce
+       // now session[s].mssf flag indecates that the receiver wish to receive frames in mssf, so max_seq (i.e. recv_max_seq) = 1<<24
+       /*
+       if (bundle[b].mssf)
+               bundle[b].max_seq = 1 << 12;
+       else */
+               bundle[b].max_seq = 1 << 24;
+       if(session[s].epdis.length > 0)
                setepdis(&bundle[b].epdis, session[s].epdis);
 
        strcpy(bundle[b].user, session[s].user);
        bundle[b].members[0] = s;
+       bundle[b].timeout = session[s].timeout;
        LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b);
        return b;
 }
@@ -1155,11 +1207,12 @@ static bundleidt new_bundle()
                {
                        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].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
+                       bundle[i].current_ses = -1;     // This is to enforce the first session 0 to be used at first
+                       memset(&frag[i], 0, sizeof(fragmentationt));
                        if (i > config->cluster_highest_bundleid)
-                               config->cluster_highest_bundleid = i;
+                                       config->cluster_highest_bundleid = i;
                        return i;
                }
        }
@@ -1426,11 +1479,21 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
 static void ipv6cp_open(sessionidt s, tunnelidt t)
 {
+       int i;
        LOG(3, s, t, "IPV6CP: Opened\n");
 
        change_state(s, ipv6cp, Opened);
-       if (session[s].ipv6prefixlen)
-               route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1);
+       for (i = 0; i < MAXROUTE6 && session[s].route6[i].ipv6prefixlen; i++)
+       {
+               route6set(s, session[s].route6[i].ipv6route, session[s].route6[i].ipv6prefixlen, 1);
+       }
+
+       if (session[s].ipv6address.s6_addr[0])
+       {
+               // Check if included in prefix
+               if (sessionbyipv6(session[s].ipv6address) != s)
+                       route6set(s, session[s].ipv6address, 128, 1);
+       }
 
        // Send an initial RA (TODO: Should we send these regularly?)
        send_ipv6_ra(s, t, NULL);
@@ -1505,7 +1568,7 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                uint8_t *o = p + 4;
                int length = l - 4;
                int gotip = 0;
-               uint8_t ident[8];
+               uint32_t ident[2];
 
                while (length > 2)
                {
@@ -1517,12 +1580,20 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                                gotip++; // seen address
                                if (o[1] != 10) return;
 
-                               *(uint32_t *) ident = htonl(session[s].ip);
-                               *(uint32_t *) (ident + 4) = 0;
+                               if (session[s].ipv6address.s6_addr[0])
+                               {
+                                       // LSB 64bits of assigned IPv6 address to user (see radius attribut Framed-IPv6-Address)
+                                       memcpy(&ident[0], &session[s].ipv6address.s6_addr[8], 8);
+                               }
+                               else
+                               {
+                                       ident[0] = htonl(session[s].ip);
+                                       ident[1] = 0;
+                               }
 
                                if (memcmp(o + 2, ident, sizeof(ident)))
                                {
-                                       q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, ident, sizeof(ident));
+                                       q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, (uint8_t *)ident, sizeof(ident));
                                        if (!q) return;
                                }
 
@@ -1645,13 +1716,46 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        }
 }
 
+static void update_sessions_in_stat(sessionidt s, uint16_t l)
+{
+       bundleidt b = session[s].bundle;
+       if (!b)
+       {
+               increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+               session[s].cin_delta += l;
+                       session[s].pin++;
+
+               sess_local[s].cin += l;
+               sess_local[s].pin++;
+       }
+       else
+       {
+               int i = frag[b].re_frame_begin_index;
+               int end = frag[b].re_frame_end_index;
+               for (;;)
+               {
+                       l = frag[b].fragment[i].length;
+                       s = frag[b].fragment[i].sid;
+                       increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+                       session[s].cin_delta += l;
+                               session[s].pin++;
+
+                       sess_local[s].cin += l;
+                       sess_local[s].pin++;
+                       if (i == end)
+                               return;
+                       i = (i + 1) & MAXFRAGNUM_MASK;
+               }
+       }
+}
+
 // process IP packet received
 //
 // This MUST be called with at least 4 byte behind 'p'.
 // (i.e. this routine writes to p[-4]).
 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 {
-       in_addr_t ip;
+       in_addr_t ip, ip_dst;
 
        CSTAT(processipin);
 
@@ -1665,6 +1769,7 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        }
 
        ip = ntohl(*(uint32_t *)(p + 12));
+       ip_dst = *(uint32_t *)(p + 16);
 
        if (l > MAXETHER)
        {
@@ -1679,7 +1784,7 @@ 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 (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;
@@ -1705,12 +1810,15 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
        if (session[s].tbf_in)
        {
-               // Are we throttling this session?
-               if (config->cluster_iam_master)
-                       tbf_queue_packet(session[s].tbf_in, p, l);
-               else
-                       master_throttle_packet(session[s].tbf_in, p, l);
-               return;
+               if (!config->no_throttle_local_IP || !sessionbyip(ip_dst))
+               {
+                       // Are we throttling this session?
+                       if (config->cluster_iam_master)
+                               tbf_queue_packet(session[s].tbf_in, p, l);
+                       else
+                               master_throttle_packet(session[s].tbf_in, p, l);
+                       return;
+               }
        }
 
        // send to ethernet
@@ -1732,12 +1840,7 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
        }
 
-       increment_counter(&session[s].cin, &session[s].cin_wrap, l);
-       session[s].cin_delta += l;
-       session[s].pin++;
-
-       sess_local[s].cin += l;
-       sess_local[s].pin++;
+       update_sessions_in_stat(s, l);
 
        eth_tx += l;
 
@@ -1749,161 +1852,387 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 {
        bundleidt b = session[s].bundle;
-       uint8_t begin_frame;
-       uint8_t end_frame;
-       uint32_t seq_num;
-       uint32_t offset;
+       bundlet * this_bundle = &bundle[b];
+       uint32_t maskSeq, max_seq;
+       int frag_offset;
+       uint16_t frag_index, frag_index_next, frag_index_prev;
+       fragmentationt *this_fragmentation = &frag[b];
+       uint8_t begin_frame = (*p & MP_BEGIN);
+       uint8_t end_frame = (*p & MP_END);
+       uint32_t seq_num, seq_num_next, seq_num_prev;
+       uint32_t i;
+       uint8_t flags = *p;
+       uint16_t begin_index, end_index;
+
+       // Perform length checking
+       if(l > MAXFRAGLEN)
+       {
+               LOG(2, s, t, "MPPP: discarding fragment larger than MAXFRAGLEN\n");
+               return;
+       }
 
-       if (!b)
+       if(!b)
        {
-               LOG(3, s, t, "MPPP: Invalid bundle id: 0\n");
+               LOG(2, s, t, "MPPP: Invalid bundle id: 0\n");
                return;
        }
-
-       begin_frame = (*p & 0x80);
-       end_frame = (*p & 0x40);
-       if (session[s].mssf)
+       // FIXME !! session[s].mssf means that the receiver wants to receive frames in mssf not means the receiver will send frames in mssf
+       /* if(session[s].mssf)
        {
                // Get 12 bit for seq number
-               uint16_t short_seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
-               uint16_t short_seq_num2 = short_seq_num >> 4;
+               seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
                p += 2;
                l -= 2;
-               seq_num = short_seq_num2;
                // After this point the pointer should be advanced 2 bytes
-               LOG(3, s, t, "MPPP: 12 bits, sequence number: %d, short1: %d, short2: %d\n",seq_num, short_seq_num, short_seq_num2);
+               LOG(3, s, t, "MPPP: 12 bits, sequence number: %d\n",seq_num);
        }
-       else
+       else */
        {
                // Get 24 bit for seq number
-               p++;
                seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00);
-               seq_num = seq_num >> 8;
-               p += 3;
+               p += 4;
                l -= 4;
                // After this point the pointer should be advanced 4 bytes
                LOG(4, s, t, "MPPP: 24 bits sequence number:%d\n",seq_num);
        }
 
-       if (seq_num - bundle[b].offset < 0)
+       max_seq = this_bundle->max_seq;
+       maskSeq = max_seq - 1;
+
+       /*
+        * Expand sequence number to 32 bits, making it as close
+        * as possible to this_fragmentation->M.
+        */
+       seq_num |= this_fragmentation->M & ~maskSeq;
+       if ((int)(this_fragmentation->M - seq_num) > (int)(maskSeq >> 1))
        {
-               bundle[b].offset = 0;
-               bundle[b].pending_frag = 0;
+               seq_num += maskSeq + 1;
+       }
+       else if ((int)(seq_num - this_fragmentation->M) > (int)(maskSeq >> 1))
+       {
+               seq_num -= maskSeq + 1; /* should never happen */
+       }
+
+       // calculate this fragment's offset from the begin seq in the bundle
+       frag_offset = (int) (seq_num - this_fragmentation->start_seq);
+       
+       sess_local[s].last_seq = seq_num;
+
+       // 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;
        }
 
-       offset = bundle[b].offset;
-       if (begin_frame)
+       uint32_t Mmin;
+
+       if (seq_num < this_fragmentation->M)
        {
-               // Check for previous non-assembled frames
-               int error = 0;
-               if (bundle[b].pending_frag)
+               Mmin = seq_num;
+               this_fragmentation->M = seq_num;
+       }
+       else
+       {
+               Mmin = sess_local[(this_bundle->members[0])].last_seq;
+               for (i = 1; i < this_bundle->num_of_links; i++)
                {
-                       uint32_t fn = bundle[b].seq_num_m - offset;
-                       uint16_t cur_len;
-                       bundle[b].pending_frag = 0;
-                       // Check for array indexes
-                       if (fn < 0 || fn > MAXFRAGNUM)
-                       {
-                               LOG(2, s, t, "ERROR: Index out of range fn:%d, bundle:%d\n",fn,b);
-                               return;
-                       }
+                       uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq;
+                       if (s_seq < Mmin)
+                               Mmin = s_seq;
+               }
+               this_fragmentation->M = Mmin;
+       }
 
-                       if (seq_num-offset < 0 || seq_num-offset > MAXFRAGNUM)
-                       {
-                               LOG(2, s, t, "ERROR: Index out of range fn(last):%d, bundle:%d\n",fn,b);
-                               return;
-                       }
-                       /////////////////////////////////////////////////////
-                       cur_len = 4;   // This is set to 4 to leave 4 bytes for function processipin
-                       for (fn = bundle[b].seq_num_m - offset; fn < seq_num - offset; fn++)
-                       {
-                               if (!frag[b].fragment[fn].length)
-                               {
-                                       LOG(4, s, t, "MPPP: Found lost fragment while reassembling frame %d in (%d,%d)\n",fn, bundle[b].seq_num_m-offset, seq_num-offset);
-                                       error = 1;
-                                       break;
-                               }
+       // calculate M offset of the M seq in the bundle
+       int M_offset = (int) (Mmin - this_fragmentation->start_seq);
 
-                               if (cur_len + frag[b].fragment[fn].length > MAXETHER)
-                               {
-                                       LOG(2, s, t, "MPPP: ERROR: very long frame after assembling %d\n", frag[b].fragment[fn].length+cur_len);
-                                       error = 1;
-                                       break;
-                               }
+       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\n", Mmin, this_fragmentation->start_seq);
 
-                               memcpy(frag[b].reassembled_frame+cur_len, frag[b].fragment[fn].data, frag[b].fragment[fn].length);
-                               cur_len += frag[b].fragment[fn].length; 
-                               frag[b].fragment[fn].length = 0;      // Indicates that this fragment has been consumed
-                               // This is usefull for compression
-                               memset(frag[b].fragment[fn].data, 0, sizeof(frag[b].fragment[fn].data));
-                       }
+               // Calculate the new start index, the previous frag are lost
+               begin_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
 
-                       if (!error)
-                       {
-                               frag[b].re_frame_len = cur_len;
-                               // Process the resassembled frame
-                               LOG(4, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len);
-                               processmpframe(s, t, frag[b].reassembled_frame, frag[b].re_frame_len, 1);
-                               // Set reassembled frame length to zero after processing it
-                               frag[b].re_frame_len = 0;
-                               memset(frag[b].reassembled_frame, 0, sizeof(frag[b].reassembled_frame));
-                       }
+               // Set new Start sequence
+               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
+               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
+               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;
+       }
+
+       // 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\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;
+
+       // 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.
+                       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
                }
-               //////////////////////////////////////////
-               bundle[b].seq_num_m = seq_num;
-               if (end_frame)
+       }
+
+       // 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)
                {
-                       // Both bits are set
-                       LOG(4, s, t, "MPPP: Both bits are set (Begin and End).\n");
-                       processmpframe(s, t, p, l, 0);
-                       // The maximum number of fragments is 1500
-                       if (seq_num - bundle[b].offset >= 1400)
-                       {
-                               bundle[b].offset = seq_num;
-                               LOG(4, s, t, "MPPP: Setting offset to: %d\n",bundle[b].offset);
-                       }
+                       // 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);
+
+                       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
                }
-               else
+       }
+
+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)
                {
-                       bundle[b].pending_frag = 1;
-                       // End bit is clear
-                       LOG(4, s, t, "MPPP: Push to receive buffer\n");
-                       // Push to the receive buffer
-                       // Array indexes checking
-                       if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM)
+                       if (b_seq == this_fragmentation->fragment[begin_index].seq)
                        {
-                               LOG(2, s, t, "ERROR: Index out of range, push to receive buffer(1) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b);
-                               return;
+                               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 (isfoundE)
+                                               // The End sequence was found and the frame is complete
+                                               break;
+                                       else
+                                               // find the next Begin
+                                               begin_index = end_index;
+                               }
                        }
-                       // Perform length checking
-                       if (l > MAXFRAGLEN)
+                       else
                        {
-                               LOG(2, s, t, "MPPP: ERROR: very long fragment length (1)\n");
-                               return;
+                               // 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;
                        }
-                       frag[b].fragment[seq_num - offset].length = l;
-                       memcpy(frag[b].fragment[seq_num - offset].data, p, l);
+               }
+               begin_index = (begin_index +1) & MAXFRAGNUM_MASK;
+               b_seq++;
+       }
+
+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)
+       {
+               if (!(this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
+               {
+                       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
                }
        }
        else
+               return; // assembling frame failed
+
+       // get the end of his frame
+       while (this_fragmentation->fragment[end_index].length)
        {
-               LOG(4, s, t, "MPPP: Push to receive buffer\n");
-               // Push to the receive buffer
-               // Array indexes checking
-               if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM)
+               if (this_fragmentation->fragment[end_index].flags & MP_END)
+                       break;
+
+               end_index = (end_index +1) & MAXFRAGNUM_MASK;
+
+               if (end_index == this_fragmentation->start_index)
+                       return; // assembling frame failed
+       }
+
+       // return if a lost fragment is found
+       if (!(this_fragmentation->fragment[end_index].length))
+               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
+
+       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, "ERROR: Index out of range, push to receive buffer(2) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b);
-                       return;
+                       LOG(2, s, t, "MPPP: discarding reassembled frames larger than MAXETHER\n");
+                       break;
                }
-               // Perform length checking
-               if (l > MAXFRAGLEN)
+
+               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)
                {
-                       LOG(2, s, t, "MPPP: ERROR: very long fragment length (2).\n");
-                       return;
+                       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;
                }
-               frag[b].fragment[seq_num - offset].length = l;
-               memcpy(frag[b].fragment[seq_num - offset].data, p, l);
        }
+
+       // 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;
+       }
+
+       // 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) &&
+               (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;
 }
 
 // process IPv6 packet received
@@ -1933,7 +2262,18 @@ void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                return;
 
        // no spoof
-       if (ipv4 != session[s].ip && memcmp(&config->ipv6_prefix, &ip, 8) && sessionbyipv6(ip) != s)
+       if (session[s].ipv6address.s6_addr[0])
+       {
+               if ((sessionbyipv6new(ip) != s) &&
+                       (ip.s6_addr[0] != 0xFE || ip.s6_addr[1] != 0x80 || ip.s6_addr16[1] != 0 || ip.s6_addr16[2] != 0 || ip.s6_addr16[3] != 0))
+               {
+                       char str[INET6_ADDRSTRLEN];
+                       LOG(5, s, t, "Dropping packet with spoofed IP %s\n",
+                                       inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN));
+                       return;
+               }
+       }
+       else if ((ipv4 != session[s].ip || memcmp(&config->ipv6_prefix, &ip, 8)) && sessionbyipv6(ip) != s)
        {
                char str[INET6_ADDRSTRLEN];
                LOG(5, s, t, "Dropping packet with spoofed IP %s\n",
@@ -1951,6 +2291,16 @@ void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                return;
        }
 
+       // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
+       if (*(p + 6) == 17 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
+                       *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
+                       *(uint16_t *)(p + 34) == 0 && *(p + 36) == 0 && *(p + 37) == 1 && *(p + 38) == 0 && *(p + 39) == 2 &&
+                       *(p + 40) == 2 && *(p + 41) == 0x22 && *(p + 42) == 2 && *(p + 43) == 0x23)
+       {
+               dhcpv6_process(s, t, p, l);
+               return;
+       }
+
        // Add on the tun header
        p -= 4;
        *(uint32_t *) p = htonl(PKTIPV6);
@@ -1989,12 +2339,7 @@ void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
        }
 
-       increment_counter(&session[s].cin, &session[s].cin_wrap, l);
-       session[s].cin_delta += l;
-       session[s].pin++;
-
-       sess_local[s].cin += l;
-       sess_local[s].pin++;
+       update_sessions_in_stat(s, l);
 
        eth_tx += l;
 
@@ -2207,9 +2552,9 @@ void sendchap(sessionidt s, tunnelidt t)
        q[1] = radius[r].id;                    // ID
        q[4] = 16;                              // value size (size of challenge)
        memcpy(q + 5, radius[r].auth, 16);      // challenge
-       strcpy((char *) q + 21, hostname);      // our name
-       *(uint16_t *) (q + 2) = htons(strlen(hostname) + 21); // length
-       tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it
+       strcpy((char *) q + 21, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname); // our name
+       *(uint16_t *) (q + 2) = htons(strlen(config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname) + 21); // length
+       tunnelsend(b, strlen(config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname) + 21 + (q - b), t); // send it
 }
 
 // fill in a L2TP message with a PPP frame,
@@ -2220,6 +2565,11 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
        uint16_t type = mtype;
        uint8_t *start = b;
 
+       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);
@@ -2265,7 +2615,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
                {
                        // Set the multilink bits
                        uint16_t bits_send = mp_bits;
-                       *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0xFF0F)|bits_send);
+                       *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send);
                        b += 2;
                }
                else
@@ -2289,7 +2639,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
 
        if ((b - start) + l > size)
        {
-               LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, (b - start) + l);
+               LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%td)\n", size, (b - start) + l);
                return NULL;
        }
 
@@ -2300,6 +2650,85 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
        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;