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Don't blindly set IP packet length from interface MTU in TSO case.

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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
This commit is contained in:
Pyun YongHyeon 2009-04-13 00:32:34 +00:00
parent de231a063a
commit 0685c824ca
1 changed files with 2 additions and 1 deletions
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3
sys/dev/fxp/if_fxp.c
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@ -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));