pppd: pass on the configured upper limit for mtu to the channel that ppp uses

SVN-Revision: 5010

openwrt/package/ppp/patches/210-lcp_mtu_max.patch

@@ -0,0 +1,17 @@
+--- ppp-2.4.3/pppd/lcp.c.old	2006-10-10 14:19:11.000000000 +0200
++++ ppp-2.4.3/pppd/lcp.c	2006-10-10 14:19:55.000000000 +0200
+@@ -1891,12 +1891,12 @@
+      * the interface MTU is set to the lowest of that, the
+      * MTU we want to use, and our link MRU.
+      */
+-    mtu = ho->neg_mru? ho->mru: PPP_MRU;
++    mtu = MIN(ho->neg_mru? ho->mru: PPP_MRU, ao->mru);
+     mru = go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU;
+ #ifdef HAVE_MULTILINK
+     if (!(multilink && go->neg_mrru && ho->neg_mrru))
+ #endif /* HAVE_MULTILINK */
+-	netif_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
++	netif_set_mtu(f->unit, MIN(mtu, mru));
+     ppp_send_config(f->unit, mtu,
+ 		    (ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
+ 		    ho->neg_pcompression, ho->neg_accompression);