make MRU configurable, NAK config requests for larger values

[l2tpns.git] / ppp.c

diff --git a/ppp.c b/ppp.c
index 774efbd..9f0a713 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.80 2005-09-13 14:23:07 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.81 2005-09-15 09:34:49 bodea Exp $";
 
 #include <stdio.h>
 #include <string.h>
@@ -577,7 +577,18 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                        switch (type)
                        {
                                case 1: // Maximum-Receive-Unit
-                                       session[s].mru = ntohs(*(uint16_t *)(o + 2));
+                                       {
+                                               uint16_t mru = ntohs(*(uint16_t *)(o + 2));
+                                               if (!config->ppp_mru || mru <= config->ppp_mru)
+                                               {
+                                                       session[s].mru = mru;
+                                                       break;
+                                               }
+
+                                               LOG(3, s, t, "    Remote requesting MRU of %u.  Rejecting.\n", mru);
+                                               mru = htons(config->ppp_mru);
+                                               q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, (uint8_t *) &mru, sizeof(mru));
+                                       }
                                        break;
 
                                case 2: // Async-Control-Character-Map
@@ -738,8 +749,9 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                                case 1: // Maximum-Receive-Unit
                                        if (*p == ConfigNak)
                                        {
-                                               session[s].mru = ntohs(*(uint16_t *)(o + 2));
-                                               LOG(3, s, t, "    Remote requested MRU of %u\n", session[s].mru);
+                                               session[s].mru = 0;
+                                               LOG(3, s, t, "    Remote requested MRU of %u; removing option\n",
+                                                       ntohs(*(uint16_t *)(o + 2)));
                                        }
                                        else
                                        {