From 0685c824ca36f69f76f1ba7e66478e80138c06b7 Mon Sep 17 00:00:00 2001 From: Pyun YongHyeon Date: Mon, 13 Apr 2009 00:32:34 +0000 Subject: Don't blindly set IP packet length from interface MTU in TSO case. Remote host can advertise smaller MSS than that of sender so upper stack might have adjusted the MSS which in turn generates IP packets that are less size than that of interface MTU. Reported by: Bjoern Koenig ( bkoenig <> alpha-tierchen dot de ) Tested by: Bjoern Koenig ( bkoenig <> alpha-tierchen dot de ) MFC after: 3 days --- sys/dev/fxp/if_fxp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'sys/dev/fxp') diff --git a/sys/dev/fxp/if_fxp.c b/sys/dev/fxp/if_fxp.c index 352a2b05a7fa..0bddd179bf16 100644 --- a/sys/dev/fxp/if_fxp.c +++ b/sys/dev/fxp/if_fxp.c @@ -1485,7 +1485,8 @@ fxp_encap(struct fxp_softc *sc, struct mbuf **m_head) * checksum in the first frame driver should compute it. */ ip->ip_sum = 0; - ip->ip_len = htons(ifp->if_mtu); + ip->ip_len = htons(m->m_pkthdr.tso_segsz + (ip->ip_hl << 2) + + (tcp->th_off << 2)); tcp->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htons(IPPROTO_TCP + (tcp->th_off << 2) + m->m_pkthdr.tso_segsz)); -- cgit v1.2.3