configure MRU in initlcp

diff --git a/l2tpns.c b/l2tpns.c
index 74c6981..8f86f1d 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 1.97 2005-05-07 08:53:23 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.98 2005-05-07 11:57:53 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -1801,12 +1801,11 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
                uint16_t message = 0xFFFF;      // message type
                uint8_t fatal = 0;
                uint8_t mandatory = 0;
-               uint8_t chap = 0;               // if CHAP being used
+               uint8_t authtype = 0;           // proxy auth type
                uint16_t asession = 0;          // assigned session
                uint32_t amagic = 0;            // magic number
                uint8_t aflags = 0;             // flags from last LCF
                uint16_t version = 0x0100;      // protocol version (we handle 0.0 as well and send that back just in case)
-               int requestchap = 0;            // do we request PAP instead of original CHAP request?
                char called[MAXTEL] = "";       // called number
                char calling[MAXTEL] = "";      // calling number
 
@@ -2187,7 +2186,11 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
                                        {
                                                uint16_t atype = ntohs(*(uint16_t *)b);
                                                LOG(4, s, t, "   Proxy Auth Type %d (%s)\n", atype, auth_type(atype));
-                                               requestchap = (atype == 2);
+                                               if (atype = 2)
+                                                       authtype = AUTHCHAP;
+                                               else if (atype == 3)
+                                                       authtype = AUTHPAP;
+
                                                break;
                                        }
                                case 30:    // Proxy Authentication Name
@@ -2224,8 +2227,10 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
                                                {
                                                        if (*p == 5 && p[1] == 6) // Magic-Number
                                                                amagic = ntohl(*(uint32_t *) (p + 2));
-                                                       else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol
-                                                               chap = 1;
+                                                       else if (*p == 3 && p[1] == 4 && *(uint16_t *) (p + 2) == htons(PPPPAP)) // Authentication-Protocol (PAP)
+                                                               authtype = AUTHPAP;
+                                                       else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol (CHAP)
+                                                               authtype = AUTHCHAP;
                                                        else if (*p == 7) // Protocol-Field-Compression
                                                                aflags |= SESSIONPFC;
                                                        else if (*p == 8) // Address-and-Control-Field-Compression
@@ -2350,8 +2355,8 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
                                        session[s].l2tp_flags = aflags; // set flags received
                                        LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags);
                                        controlnull(t); // ack
-                                       // In CHAP state, request PAP instead
-                                       if (requestchap)
+                                       // proxy authentication type is not supported
+                                       if (authtype && !(config->radius_authtypes & authtype))
                                                initlcp(t, s);
                                        break;
                                case 14:      // CDN

diff --git a/l2tpns.h b/l2tpns.h
index 3d0be8f..4b55f43 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,5 +1,5 @@
 // L2TPNS Global Stuff
-// $Id: l2tpns.h,v 1.65 2005-05-05 10:02:08 bodea Exp $
+// $Id: l2tpns.h,v 1.66 2005-05-07 11:57:53 bodea Exp $
 
 #ifndef __L2TPNS_H__
 #define __L2TPNS_H__
@@ -43,6 +43,7 @@
 #define ECHO_TIMEOUT   60              // Time between last packet sent and LCP ECHO generation
 #define IDLE_TIMEOUT   240             // Time between last packet sent and LCP ECHO generation
 #define BUSY_WAIT_TIME 3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
+#define DEFAULT_MRU    1458            // maximum packet size to avoid fragmentation when LNS ethernet MTU is 1500
 
 // Constants
 #ifndef ETCDIR

diff --git a/ppp.c b/ppp.c
index fb63d88..b808e05 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.50 2005-05-07 08:53:23 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.51 2005-05-07 11:57:53 bodea Exp $";
 
 #include <stdio.h>
 #include <string.h>
@@ -1195,39 +1195,48 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionid
        return b;
 }
 
-// Send initial LCP ConfigReq for PAP, set magic no.
+// Send initial LCP ConfigReq for preferred authentication type, set magic no and MRU
 void initlcp(tunnelidt t, sessionidt s)
 {
-       char b[500], *q;
-       int size;
+       char b[500], *q, *l;
 
        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;
+       LOG(4, s, t, "Sending LCP ConfigReq for %s\n",
+           config->radius_authprefer == AUTHCHAP ? "CHAP" : "PAP");
+
+       if (!session[s].mru)
+               session[s].mru = DEFAULT_MRU;
+
+       l = q;
+       *l++ = ConfigReq;
+       *l++ = (time_now % 255) + 1; // ID
+
+       *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
+       *(uint16_t *) l = htons(session[s].mru); l += 2;
+
+       *l++ = 3; // Authentication-Protocol
        if (config->radius_authprefer == AUTHCHAP)
        {
-               *(uint8_t *)(q + 11) = 5;
-               *(uint16_t *)(q + 12) = htons(PPPCHAP);
-               *(uint8_t *)(q + 14) = 5; // MD5
-               size = 15;
+               *l++ = 5; // length
+               *(uint16_t *) l = htons(PPPCHAP); l += 2;
+               *l++ = 5; // MD5
        }
        else
        {
-               *(uint8_t *)(q + 11) = 4;
-               *(uint16_t *)(q + 12) = htons(PPPPAP);
-               size = 14;
+               *l++ = 4; // length
+               *(uint16_t *) l = htons(PPPPAP); l += 2;
        }
 
-       LOG_HEX(5, "PPPLCP", q, size);
-       tunnelsend(b, (q - b) + size, t);
+       *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