From 6c71960bcfef9db4433f7eacd34aededc43d73b4 Mon Sep 17 00:00:00 2001 From: Brendan O'Dea Date: Thu, 17 Nov 2005 05:24:17 +0000 Subject: [PATCH 1/1] ensure MRU is sane --- ppp.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/ppp.c b/ppp.c index 358b90b..0b63596 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.85 2005-11-04 14:41:50 bodea Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.86 2005-11-17 05:24:17 bodea Exp $"; #include #include @@ -575,7 +575,18 @@ 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 (mru >= 576) + { + session[s].mru = mru; + break; + } + + LOG(3, s, t, " Remote requesting MRU of %u. Rejecting.\n", mru); + mru = htons(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 -- 2.20.1