- Add support for LCP Ident and CallBack (rejection only) from Yuri

- Initiate LCP if not attempted by the client

diff --git a/Changes b/Changes
index 95bcd81..8b34949 100644 (file)
--- a/Changes
+++ b/Changes
@@ -9,6 +9,8 @@
 - Write pid file if filename is set
 - Add startup script and monitor script from Yuri
 - Some logging correctness fixes from Iain Wade
+- Add support for LCP Ident and CallBack (rejection only) from Yuri
+- Initiate LCP if not attempted by the client
 
 * Tue Jul 13 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.1
 - Update INSTALL, Docs/manual.html documentation.

diff --git a/l2tpns.c b/l2tpns.c
index 47ce8d9..f322c6e 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -4,7 +4,7 @@
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.19 2004-08-02 03:38:01 fred_nerk Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.20 2004-08-02 05:40:21 fred_nerk Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -2035,7 +2035,7 @@ int regular_cleanups(void)
                if (!session[s].tunnel) // Session isn't in use
                        continue;
 
-               if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED) )
+               if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED))
                {
                        // IPCP has not completed yet. Resend
                        log(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
@@ -3497,7 +3497,9 @@ int sessionsetup(tunnelidt t, sessionidt s)
        for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 1);
 
-       if (!session[s].sid) {  // did this session just finish radius?
+       if (!session[s].sid)
+       {
+               // did this session just finish radius?
                log(3, session[s].ip, s, t, "Sending initial IPCP to client\n");
                sendipcp(t, s);
                session[s].sid = ++last_sid;

diff --git a/l2tpns.h b/l2tpns.h
index fdd4e5b..0376529 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,5 +1,5 @@
 // L2TPNS Global Stuff
-// $Id: l2tpns.h,v 1.14 2004-08-02 03:38:01 fred_nerk Exp $
+// $Id: l2tpns.h,v 1.15 2004-08-02 05:40:21 fred_nerk Exp $
 
 #ifndef __L2TPNS_H__
 #define __L2TPNS_H__
@@ -90,7 +90,8 @@ enum
        ProtocolRej,
        EchoReq,
        EchoReply,
-       DiscardRequest
+       DiscardRequest,
+       IdentRequest
 };
 
 // Types

diff --git a/ppp.c b/ppp.c
index de37bf2..e162f06 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.9 2004-08-02 03:38:01 fred_nerk Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.10 2004-08-02 05:40:21 fred_nerk Exp $";
 
 #include <stdio.h>
 #include <string.h>
@@ -23,6 +23,8 @@ extern u32 eth_tx;
 extern time_t time_now;
 extern struct configt *config;
 
+void sendccp(tunnelidt t, sessionidt s);
+
 // Process PAP messages
 void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l)
 {
@@ -83,6 +85,7 @@ void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l)
                if (session[s].ip)
                {
                    log(3, session[s].ip, s, t, "%d Already an IP allocated: %s (%d)\n", getpid(), inet_toa(htonl(session[s].ip)), session[s].ip_pool_index);
+                       session[s].flags &= ~SF_IPCP_ACKED;
                }
                else
                {
@@ -213,6 +216,7 @@ char *ppp_lcp_types[] = {
        "EchoReq",
        "EchoReply",
        "DiscardRequest",
+       "IdentRequest",
 };
 
 void dumplcp(u8 *p, int l)
@@ -304,6 +308,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
 {
        u8 b[MAXCONTROL];
        u8 *q = NULL;
+       u32  magicno = 0;
 
 
        CSTAT(call_processlcp);
@@ -338,6 +343,10 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                                case 1: // Maximum-Receive-Unit
                                        session[s].mru = ntohs(*(u16 *)(o + 2));
                                        break;
+                               case 2: // asyncmap
+                                       log_hex(2, "PPP LCP Packet", p, l);
+                                       log(2, 0, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
+                                       break;
                                case 3: // Authentication-Protocol
                                        {
                                                int proto = ntohs(*(u16 *)(o + 2));
@@ -362,27 +371,36 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                                        }
                                case 5: // Magic-Number
                                        {
-//                                             u32 magicno = ntohl(*(u32 *)(o + 2));
+                                               magicno = ntohl(*(u32 *)(o + 2));
                                                break;
                                        }
                                case 4: // Quality-Protocol
-                                       {
-//                                             u32 qp = ntohl(*(u32 *)(o + 2));
-                                               break;
-                                       }
                                case 7: // Protocol-Field-Compression
-                                       {
-//                                             u32 pfc = ntohl(*(u32 *)(o + 2));
-                                               break;
-                                       }
                                case 8: // Address-And-Control-Field-Compression
-                                       {
-//                                             u32 afc = ntohl(*(u32 *)(o + 2));
                                                break;
+                               case 13: // CallBack option for LCP extention of win2000/routers L2TP client
+                               case 17:
+                               case 18:
+                               {
+                                       // Reject LCP CallBack
+                                       log(2, session[s].ip, s, t, "    PPP LCP Option type %d, len=%d\n", type, length);
+                                       memcpy(p + 4, o, length);
+                                       *(u16 *)(p + 2) = htons(length + 4);
+                                       *p = ConfigRej;
+                                       q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
+                                       tunnelsend(b, 12 + length + 4, t);
+                                       return;
                                        }
+
                                default:
+                                       // Reject Unknown LCP Option to stop to send it again
                                        log(2, session[s].ip, s, t, "    Unknown PPP LCP Option type %d\n", type);
-                                       break;
+                                       memcpy(p + 4, o, length);
+                                       *(u16 *)(p + 2) = htons(length + 4);
+                                       *p = ConfigRej;
+                                       q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
+                                       tunnelsend(b, 12 + length + 4, t);
+                                       return;
                        }
                        x -= length;
                        o += length;
@@ -399,6 +417,8 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                        }
                        *q = ConfigAck;
                        tunnelsend(b, l + (q - b), t);
+                       // For win2k L2TP clients, LCP should be initiated by the LNS
+                       if (magicno) initlcp(t, s);
                }
                else
                {
@@ -448,6 +468,23 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
        {
                // Ignore it, last_packet time is set earlier than this.
        }
+       else if (*p == IdentRequest)
+       {
+               *p = CodeRej;
+               if (l > MAXCONTROL)
+               {
+                       log(1, 0, s, t, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l);
+                       l = 1400;
+               }
+               q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+               if (!q)
+               {
+                       log(3, session[s].ip, s, t, "Failed to create IdentRej.\n");
+                       return;
+               }
+               log_hex(5, "LCPIdentRej", q, l + 4);
+               tunnelsend(b, 12 + 4 + l, t);
+       }
        else
        {
                log(1, session[s].ip, s, t, "Unexpected LCP code %d\n", *p);
@@ -470,7 +507,8 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                return ;
        }
        if (*p == ConfigAck)
-       {                          // happy with our IPCP
+       {
+               // happy with our IPCP
                u16 r = session[s].radius;
                if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) {
                        if (!r)
@@ -480,7 +518,8 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                }
                session[s].flags |= SF_IPCP_ACKED;
 
-               return ;                 // done
+               log(3, session[s].ip, s, t, "IPCP Acked, session is now active\n");
+               return;
        }
        if (*p != ConfigReq)
        {
@@ -488,6 +527,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                STAT(tunnel_rx_errors);
                return ;
        }
+       log(4, session[s].ip, s, t, "IPCP ConfigReq received\n");
        if (ntohs(*(u16 *) (p + 2)) > l)
        {
                log(1, 0, s, t, "Length mismatch IPCP %d/%d\n", ntohs(*(u16 *) (p + 2)), l);
@@ -505,6 +545,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                u8 *i,
                *q;
 
+               l = ntohs(*(u16 *) (p + 2)); // We must use length from IPCP len field
                q = p + 4;
                i = p + l;
                while (q < i && q[1])
@@ -514,12 +555,13 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                        q += q[1];
                }
                if (q < i)
-               {                       // reject
+               {
+                       // reject
                        u16 n = 4;
                        i = p + l;
-                       q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
-                       if (!q) {
-                               log(2, 0, s, t, "Failed to send IPCP.\n");
+                       if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
+                       {
+                               log(2, 0, s, t, "Failed to send IPCP ConfigRej\n");
                                return;
                        }
                        *q = ConfigRej;
@@ -535,27 +577,29 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                                p += p[1];
                        }
                        *(u16 *) (q + 2) = htons(n);
+                       log(4, session[s].ip, s, t, "Sending ConfigRej\n");
                        tunnelsend(b, n + (q - b), t); // send it
                }
                else
                {
+                       log(4, session[s].ip, s, t, "Sending ConfigAck\n");
                        *p = ConfigAck;
-                       i = findppp(p, 0x81); // Primary DNS address
-                       if (i)
+                       if ((i = findppp(p, 0x81))) // Primary DNS address
                        {
                                if (*(u32 *) (i + 2) != htonl(session[s].dns1))
                                {
                                        *(u32 *) (i + 2) = htonl(session[s].dns1);
                                        *p = ConfigNak;
+                                       log(5, session[s].ip, s, t, "   DNS1 = %s\n", inet_toa(session[s].dns1));
                                }
                        }
-                       i = findppp(p, 0x83); // Secondary DNS address (TBA, is it)
-                       if (i)
+                       if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it)
                        {
                                if (*(u32 *) (i + 2) != htonl(session[s].dns2))
                                {
                                        *(u32 *) (i + 2) = htonl(session[s].dns2);
                                        *p = ConfigNak;
+                                       log(5, session[s].ip, s, t, "   DNS2 = %s\n", inet_toa(session[s].dns1));
                                }
                        }
                        i = findppp(p, 3);   // IP address
@@ -569,9 +613,11 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                        {
                                *(u32 *) (i + 2) = htonl(session[s].ip);
                                *p = ConfigNak;
+                               log(4, session[s].ip, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n",
+                                               inet_toa(session[s].ip));
                        }
-                       q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
-                       if (!q) {
+                       if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
+                       {
                                log(2, 0, s, t, " Failed to send IPCP packet.\n");
                                return;
                        }
@@ -699,12 +745,13 @@ void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l)
                        else
                        {
                                *p = ConfigRej;        // reject
+                               sendccp(t, s);
                        }
                }
                else
                        *p = TerminateAck;     // close
-               q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
-               if (!q) {
+               if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP)))
+               {
                        log(1,0,0,0, "Failed to send CCP packet.\n");   
                        return;
                }
@@ -772,7 +819,7 @@ u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtyp
        *(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel
        *(u16 *) (b + 4) = htons(session[s].far); // session
        b += 6;
-       if (mtype != PPPLCP && !(session[s].l2tp_flags & SESSIONACFC))
+       if (mtype && !(session[s].l2tp_flags & SESSIONACFC))
        {
                *(u16 *) b = htons(0xFF03); // HDLC header
                b += 2;
@@ -834,3 +881,16 @@ void initlcp(tunnelidt t, sessionidt s)
        tunnelsend(b, 12 + 8, t);
 }
 
+// Send CCP reply
+void sendccp(tunnelidt t, sessionidt s)
+{
+       char *q, b[500] = {0};
+
+       q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP);
+       *q = ConfigReq;
+       *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
+       *(u16 *)(q + 2) = htons(4); // Length
+       log_hex(5, "PPPCCP", q, 4);
+       tunnelsend(b, (q - b) + 4 , t);
+}
+