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remove old compatability code
[l2tpns.git] / ppp.c
diff --git a/ppp.c b/ppp.c
index 5ba0279..25e6f8a 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.48 2005/05/05 10:02:08 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.64 2005/06/24 08:34:53 bodea Exp $";
 
 #include <stdio.h>
 #include <string.h>
 
 #include <stdio.h>
 #include <string.h>
@@ -24,6 +24,7 @@ extern time_t time_now;
 extern configt *config;
 
 static void initccp(tunnelidt t, sessionidt s);
 extern configt *config;
 
 static void initccp(tunnelidt t, sessionidt s);
+static uint8_t *add_lcp_auth(uint8_t *b, int size, int authtype);
 
 // Process PAP messages
 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 
 // Process PAP messages
 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
@@ -40,7 +41,7 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
                LOG(1, s, t, "Short PAP %u bytes\n", l);
                STAT(tunnel_rx_errors);
                sessionshutdown(s, "Short PAP packet.", 3, 0);
                LOG(1, s, t, "Short PAP %u bytes\n", l);
                STAT(tunnel_rx_errors);
                sessionshutdown(s, "Short PAP packet.", 3, 0);
-               return ;
+               return;
        }
 
        if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
        }
 
        if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
@@ -48,7 +49,7 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
                LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
                sessionshutdown(s, "PAP length mismatch.", 3, 0);
                LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
                sessionshutdown(s, "PAP length mismatch.", 3, 0);
-               return ;
+               return;
        }
        l = hl;
 
        }
        l = hl;
 
@@ -57,7 +58,7 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
                LOG(1, s, t, "Unexpected PAP code %d\n", *p);
                STAT(tunnel_rx_errors);
                sessionshutdown(s, "Unexpected PAP code.", 3, 0);
                LOG(1, s, t, "Unexpected PAP code %d\n", *p);
                STAT(tunnel_rx_errors);
                sessionshutdown(s, "Unexpected PAP code.", 3, 0);
-               return ;
+               return;
        }
 
        {
        }
 
        {
@@ -156,14 +157,16 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
        {
                LOG(1, s, t, "Short CHAP %u bytes\n", l);
                STAT(tunnel_rx_errors);
        {
                LOG(1, s, t, "Short CHAP %u bytes\n", l);
                STAT(tunnel_rx_errors);
-               return ;
+               sessionshutdown(s, "Short CHAP packet.", 3, 0);
+               return;
        }
 
        if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
        {
                LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
        }
 
        if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
        {
                LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
-               return ;
+               sessionshutdown(s, "CHAP length mismatch.", 3, 0);
+               return;
        }
        l = hl;
 
        }
        l = hl;
 
@@ -171,20 +174,23 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
        {
                LOG(1, s, t, "Unexpected CHAP response code %d\n", *p);
                STAT(tunnel_rx_errors);
        {
                LOG(1, s, t, "Unexpected CHAP response code %d\n", *p);
                STAT(tunnel_rx_errors);
+               sessionshutdown(s, "CHAP length mismatch.", 3, 0);
                return;
        }
        if (p[1] != radius[r].id)
        {
                LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
                STAT(tunnel_rx_errors);
                return;
        }
        if (p[1] != radius[r].id)
        {
                LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
                STAT(tunnel_rx_errors);
-               return ;
+               sessionshutdown(s, "Unexpected CHAP response ID.", 3, 0);
+               return;
        }
 
        if (l < 5 || p[4] != 16)
        {
                LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
                STAT(tunnel_rx_errors);
        }
 
        if (l < 5 || p[4] != 16)
        {
                LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
                STAT(tunnel_rx_errors);
-               return ;
+               sessionshutdown(s, "Bad CHAP response length.", 3, 0);
+               return;
        }
 
        l -= 5;
        }
 
        l -= 5;
@@ -193,7 +199,8 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
        {
                LOG(1, s, t, "CHAP user too long %d\n", l - 16);
                STAT(tunnel_rx_errors);
        {
                LOG(1, s, t, "CHAP user too long %d\n", l - 16);
                STAT(tunnel_rx_errors);
-               return ;
+               sessionshutdown(s, "CHAP username too long.", 3, 0);
+               return;
        }
 
        // Run PRE_AUTH plugins
        }
 
        // Run PRE_AUTH plugins
@@ -279,8 +286,14 @@ static void dumplcp(uint8_t *p, int l)
                                {
                                        int proto = ntohs(*(uint16_t *)(o + 2));
                                        LOG(4, 0, 0, "   %s 0x%x (%s)\n", lcp_type(type), proto,
                                {
                                        int proto = ntohs(*(uint16_t *)(o + 2));
                                        LOG(4, 0, 0, "   %s 0x%x (%s)\n", lcp_type(type), proto,
-                                               proto == PPPCHAP ? "CHAP" :
-                                               proto == PPPPAP  ? "PAP"  : "UNKNOWN");
+                                               proto == PPPPAP  ? "PAP"  : "UNSUPPORTED");
+                               }
+                               else if (length == 5)
+                               {
+                                       int proto = ntohs(*(uint16_t *)(o + 2));
+                                       int algo = *(uint8_t *)(o + 4);
+                                       LOG(4, 0, 0, "   %s 0x%x 0x%x (%s)\n", lcp_type(type), proto, algo,
+                                               (proto == PPPCHAP && algo == 5) ? "CHAP MD5"  : "UNSUPPORTED");
                                }
                                else
                                        LOG(4, 0, 0, "   %s odd length %d\n", lcp_type(type), length);
                                }
                                else
                                        LOG(4, 0, 0, "   %s odd length %d\n", lcp_type(type), length);
@@ -341,7 +354,33 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 
        if (*p == ConfigAck)
        {
 
        if (*p == ConfigAck)
        {
-               LOG(3, s, t, "LCP: Discarding ConfigAck\n");
+               int x = l - 4;
+               uint8_t *o = (p + 4);
+
+               LOG(3, s, t, "LCP: ConfigAck (%d bytes)...\n", l);
+               if (config->debug > 3) dumplcp(p, l);
+
+               while (x > 2)
+               {
+                       int type = o[0];
+                       int length = o[1];
+
+                       if (length == 0 || type == 0 || x < length) break;
+                       switch (type)
+                       {
+                               case 3: // Authentication-Protocol
+                                       {
+                                               int proto = ntohs(*(uint16_t *)(o + 2));
+                                               if (proto == PPPCHAP && *(o + 4) == 5)
+                                                       sendchap(t, s);
+                                       }
+
+                                       break;
+                       }
+                       x -= length;
+                       o += length;
+               }
+
                session[s].flags |= SF_LCP_ACKED;
        }
        else if (*p == ConfigReq)
                session[s].flags |= SF_LCP_ACKED;
        }
        else if (*p == ConfigReq)
@@ -391,24 +430,35 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
                                        *q++ = 6;
                                        memset(q, 0, 4); // asyncmap 0
                                        q += 4;
                                        *q++ = 6;
                                        memset(q, 0, 4); // asyncmap 0
                                        q += 4;
-                                       *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length
                                        break;
 
                                case 3: // Authentication-Protocol
                                        {
                                                int proto = ntohs(*(uint16_t *)(o + 2));
                                                char proto_name[] = "0x0000";
                                        break;
 
                                case 3: // Authentication-Protocol
                                        {
                                                int proto = ntohs(*(uint16_t *)(o + 2));
                                                char proto_name[] = "0x0000";
+                                               uint8_t *a;
+
                                                if (proto == PPPPAP)
                                                if (proto == PPPPAP)
-                                                       break;
+                                               {
+                                                       if (config->radius_authtypes & AUTHPAP)
+                                                               break;
 
 
-                                               if (response && *response != ConfigNak) // rej already queued
-                                                       break;
+                                                       strcpy(proto_name, "PAP");
+                                               }
+                                               else if (proto == PPPCHAP)
+                                               {
+                                                       if (config->radius_authtypes & AUTHCHAP
+                                                           && *(o + 4) == 5) // MD5
+                                                               break;
 
 
-                                               if (proto == PPPCHAP)
                                                        strcpy(proto_name, "CHAP");
                                                        strcpy(proto_name, "CHAP");
+                                               }
                                                else
                                                        sprintf(proto_name, "%#4.4x", proto);
 
                                                else
                                                        sprintf(proto_name, "%#4.4x", proto);
 
+                                               if (response && *response != ConfigNak) // rej already queued
+                                                       break;
+
                                                LOG(2, s, t, "    Remote requesting %s authentication.  Rejecting.\n", proto_name);
 
                                                if (!response)
                                                LOG(2, s, t, "    Remote requesting %s authentication.  Rejecting.\n", proto_name);
 
                                                if (!response)
@@ -419,16 +469,28 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
                                                        q += 4;
                                                }
 
                                                        q += 4;
                                                }
 
-                                               if ((q - b + length) > sizeof(b))
+                                               a = add_lcp_auth(q, sizeof(b) - (q - b), config->radius_authprefer);
+                                               if (!a)
                                                {
                                                        LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
                                                        break;
                                                }
 
                                                {
                                                        LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
                                                        break;
                                                }
 
-                                               memcpy(q, o, length);
-                                               *(uint16_t *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead
-                                               q += length;
-                                               *((uint16_t *) (response + 2)) = htons(q - response);
+                                               q = a;
+
+                                               if (config->radius_authtypes != config->radius_authprefer)
+                                               {
+                                                       a = add_lcp_auth(q, sizeof(b) - (q - b), config->radius_authtypes & ~config->radius_authprefer);
+                                                       if (!a)
+                                                       {
+                                                               LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
+                                                               break;
+                                                       }
+
+                                                       q = a;
+                                               }
+
+                                               break;
                                        }
                                        break;
 
                                        }
                                        break;
 
@@ -459,31 +521,97 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 
                                        memcpy(q, o, length);
                                        q += length;
 
                                        memcpy(q, o, length);
                                        q += length;
-                                       *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length
                        }
                        x -= length;
                        o += length;
                }
 
                        }
                        x -= length;
                        o += length;
                }
 
-               if (!response)
+               if (response)
+               {
+                       l = q - response; // LCP packet length
+                       *((uint16_t *) (response + 2)) = htons(l); // update header
+               }
+               else
                {
                {
-                       // Send back a ConfigAck
-                       q = response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
-                       if (!q) return;
-                       *q = ConfigAck;
+                       // Send packet back as ConfigAck
+                       response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+                       if (!response) return;
+                       *response = ConfigAck;
                }
 
                LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response));
                }
 
                LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response));
-               tunnelsend(b, l + (q - b), t);
+               tunnelsend(b, l + response - b, t);
 
                if (!(session[s].flags & SF_LCP_ACKED))
 
                if (!(session[s].flags & SF_LCP_ACKED))
-                       initlcp(t, s);
+                       sendlcp(t, s, config->radius_authprefer);
        }
        else if (*p == ConfigNak)
        {
        }
        else if (*p == ConfigNak)
        {
-               LOG(1, s, t, "Remote end sent a ConfigNak.  Ignoring\n");
+               int x = l - 4;
+               uint8_t *o = (p + 4);
+               int authtype = -1;
+
+               LOG(3, s, t, "LCP: ConfigNak (%d bytes)...\n", l);
                if (config->debug > 3) dumplcp(p, l);
                if (config->debug > 3) dumplcp(p, l);
-               return ;
+
+               while (x > 2)
+               {
+                       int type = o[0];
+                       int length = o[1];
+
+                       if (length == 0 || type == 0 || x < length) break;
+                       switch (type)
+                       {
+                               case 1: // Maximum-Receive-Unit
+                                       session[s].mru = ntohs(*(uint16_t *)(o + 2));
+                                       LOG(3, s, t, "    Remote requested MRU of %u\n", session[s].mru);
+                                       break;
+
+                               case 3: // Authentication-Protocol
+                                       if (authtype > 0)
+                                               break;
+
+                                       {
+                                               int proto = ntohs(*(uint16_t *)(o + 2));
+                                               if (proto == PPPPAP)
+                                               {
+                                                       authtype = config->radius_authtypes & AUTHPAP;
+                                                       LOG(3, s, t, "    Remote requested PAP authentication...%sing\n",
+                                                               authtype ? "accept" : "reject");
+                                               }
+                                               else if (proto == PPPCHAP && *(o + 4) == 5)
+                                               {
+                                                       authtype = config->radius_authtypes & AUTHCHAP;
+                                                       LOG(3, s, t, "    Remote requested CHAP authentication...%sing\n",
+                                                               authtype ? "accept" : "reject");
+                                               }
+                                               else
+                                               {
+                                                       LOG(3, s, t, "    Rejecting unsupported authentication %#4x\n",
+                                                               proto);
+                                               }
+                                       }
+
+                                       break;
+
+                               default:
+                                       LOG(2, s, t, "    Remote NAKed LCP type %u?\n", type);
+                                       break;
+                       }
+                       x -= length;
+                       o += length;
+               }
+
+               if (!authtype)
+               {
+                       sessionshutdown(s, "Unsupported authentication.", 3, 0);
+                       return;
+               }
+
+               if (authtype == -1)
+                       authtype = config->radius_authprefer;
+
+               sendlcp(t, s, authtype);
        }
        else if (*p == TerminateReq)
        {
        }
        else if (*p == TerminateReq)
        {
@@ -542,7 +670,6 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
        {
                LOG(1, s, t, "Unexpected LCP code %d\n", *p);
                STAT(tunnel_rx_errors);
        {
                LOG(1, s, t, "Unexpected LCP code %d\n", *p);
                STAT(tunnel_rx_errors);
-               return ;
        }
 }
 
        }
 }
 
@@ -591,22 +718,32 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 
        if (*p == ConfigAck)
        {
 
        if (*p == ConfigAck)
        {
-               // happy with our IPCP
                uint16_t r = sess_local[s].radius;
                uint16_t r = sess_local[s].radius;
-               if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden)
-               {
-                       if (!r)
-                               r = radiusnew(s);
-                       if (r)
-                               radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last
-               }
+
+               // ignore duplicate ACKs
+               if (session[s].flags & SF_IPCP_ACKED)
+                       return;
+
+               // happy with our IPCP
                session[s].flags |= SF_IPCP_ACKED;
 
                LOG(3, s, t, "IPCP Acked, session is now active\n");
 
                session[s].flags |= SF_IPCP_ACKED;
 
                LOG(3, s, t, "IPCP Acked, session is now active\n");
 
-               // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiaion for routers
+               // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiation for routers
                session[s].flags &= ~(SF_LCP_ACKED|SF_CCP_ACKED);
 
                session[s].flags &= ~(SF_LCP_ACKED|SF_CCP_ACKED);
 
+               if (r && session[s].walled_garden)
+               {
+                       radiusclear(r, s);
+                       return;
+               }
+
+               if (!r)
+                       r = radiusnew(s);
+
+               if (r)
+                       radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last
+
                return;
        }
        if (*p != ConfigReq)
                return;
        }
        if (*p != ConfigReq)
@@ -888,21 +1025,26 @@ void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
                return;
        }
 
                return;
        }
 
+       p += 4;
+       l -= 4;
+
        if (session[s].snoop_ip && session[s].snoop_port)
        {
                // Snooping this session
        if (session[s].snoop_ip && session[s].snoop_port)
        {
                // Snooping this session
-               snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port);
+               snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
        }
 
        }
 
-       session[s].cin += l - 4;
-       session[s].total_cin += l - 4;
-       sess_local[s].cin += l - 4;
-
+       increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+       session[s].cin_delta += l;
        session[s].pin++;
        session[s].pin++;
-       eth_tx += l - 4;
+
+       sess_local[s].cin += l;
+       sess_local[s].pin++;
+
+       eth_tx += l;
 
        STAT(tun_tx_packets);
 
        STAT(tun_tx_packets);
-       INC_STAT(tun_tx_bytes, l - 4);
+       INC_STAT(tun_tx_bytes, l);
 }
 
 // process IPv6 packet received
 }
 
 // process IPv6 packet received
@@ -976,21 +1118,26 @@ void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
                return;
        }
 
                return;
        }
 
+       p += 4;
+       l -= 4;
+
        if (session[s].snoop_ip && session[s].snoop_port)
        {
                // Snooping this session
        if (session[s].snoop_ip && session[s].snoop_port)
        {
                // Snooping this session
-               snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port);
+               snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
        }
 
        }
 
-       session[s].cin += l - 4;
-       session[s].total_cin += l - 4;
-       sess_local[s].cin += l - 4;
-
+       increment_counter(&session[s].cin, &session[s].cin_wrap, l);
+       session[s].cin_delta += l;
        session[s].pin++;
        session[s].pin++;
-       eth_tx += l - 4;
+
+       sess_local[s].cin += l;
+       sess_local[s].pin++;
+
+       eth_tx += l;
 
        STAT(tun_tx_packets);
 
        STAT(tun_tx_packets);
-       INC_STAT(tun_tx_bytes, l - 4);
+       INC_STAT(tun_tx_bytes, l);
 }
 
 //
 }
 
 //
@@ -1010,19 +1157,24 @@ void send_ipin(sessionidt s, uint8_t *buf, int len)
                return;
        }
 
                return;
        }
 
+       buf += 4;
+       len -= 4;
+
        if (session[s].snoop_ip && session[s].snoop_port)
        {
                // Snooping this session
        if (session[s].snoop_ip && session[s].snoop_port)
        {
                // Snooping this session
-               snoop_send_packet(buf + 4, len - 4, session[s].snoop_ip, session[s].snoop_port);
+               snoop_send_packet(buf, len, session[s].snoop_ip, session[s].snoop_port);
        }
 
        // Increment packet counters
        }
 
        // Increment packet counters
-       session[s].cin += len - 4;
-       session[s].total_cin += len - 4;
-       sess_local[s].cin += len - 4;
-
+       increment_counter(&session[s].cin, &session[s].cin_wrap, len);
+       session[s].cin_delta += len;
        session[s].pin++;
        session[s].pin++;
-       eth_tx += len - 4;
+
+       sess_local[s].cin += len;
+       sess_local[s].pin++;
+
+       eth_tx += len;
 
        STAT(tun_tx_packets);
        INC_STAT(tun_tx_bytes, len - 4);
 
        STAT(tun_tx_packets);
        INC_STAT(tun_tx_bytes, len - 4);
@@ -1098,8 +1250,6 @@ void sendchap(tunnelidt t, sessionidt s)
 
        LOG(1, s, t, "Send CHAP challenge\n");
 
 
        LOG(1, s, t, "Send CHAP challenge\n");
 
-       // new challenge
-       random_data(radius[r].auth, sizeof(radius[r].auth));
        radius[r].chap = 1;             // CHAP not PAP
        radius[r].id++;
        if (radius[r].state != RADIUSCHAP)
        radius[r].chap = 1;             // CHAP not PAP
        radius[r].id++;
        if (radius[r].state != RADIUSCHAP)
@@ -1169,27 +1319,64 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionid
        return b;
 }
 
        return b;
 }
 
-// Send initial LCP ConfigReq for PAP, set magic no.
-void initlcp(tunnelidt t, sessionidt s)
+static uint8_t *add_lcp_auth(uint8_t *b, int size, int authtype)
 {
 {
-       char b[500], *q;
+       if ((authtype == AUTHCHAP && size < 5) || size < 4)
+               return 0;
+
+       *b++ = 3; // Authentication-Protocol
+       if (authtype == AUTHCHAP)
+       {
+               *b++ = 5; // length
+               *(uint16_t *) b = htons(PPPCHAP); b += 2;
+               *b++ = 5; // MD5
+       }
+       else if (authtype == AUTHPAP)
+       {
+               *b++ = 4; // length
+               *(uint16_t *) b = htons(PPPPAP); b += 2;
+       }
+       else
+       {
+               LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype);
+       }
+
+       return b;
+}
+
+// Send initial LCP ConfigReq for MRU, authentication type and magic no
+void sendlcp(tunnelidt t, sessionidt s, int authtype)
+{
+       char b[500], *q, *l;
 
        if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP)))
                return;
 
 
        if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP)))
                return;
 
-       LOG(4, s, t, "Sending LCP ConfigReq for PAP\n");
-       *q = ConfigReq;
-       *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID
-       *(uint16_t *)(q + 2) = htons(14); // Length
-       *(uint8_t *)(q + 4) = 5;
-       *(uint8_t *)(q + 5) = 6;
-       *(uint32_t *)(q + 6) = htonl(session[s].magic);
-       *(uint8_t *)(q + 10) = 3;
-       *(uint8_t *)(q + 11) = 4;
-       *(uint16_t *)(q + 12) = htons(PPPPAP); // PAP
-
-       LOG_HEX(5, "PPPLCP", q, 14);
-       tunnelsend(b, (q - b) + 14, t);
+       LOG(4, s, t, "Sending LCP ConfigReq for %s\n",
+           authtype == AUTHCHAP ? "CHAP" : "PAP");
+
+       if (!session[s].mru)
+               session[s].mru = DEFAULT_MRU;
+
+       l = q;
+       *l++ = ConfigReq;
+       *l++ = (time_now % 255) + 1; // ID
+
+       l += 2; //Save space for length
+
+       *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
+       *(uint16_t *) l = htons(session[s].mru); l += 2;
+
+       l = add_lcp_auth(l, sizeof(b) - (l - b), authtype);
+
+       *l++ = 5; *l++ = 6; // Magic-Number (length 6)
+       *(uint32_t *) l = htonl(session[s].magic);
+       l += 4;
+
+       *(uint16_t *)(q + 2) = htons(l - q); // Length
+
+       LOG_HEX(5, "PPPLCP", q, l - q);
+       tunnelsend(b, (l - b), t);
 }
 
 // Send CCP request for no compression
 }
 
 // Send CCP request for no compression
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"