Hi,
I've come across what I believe to be a bug in if_spppsubr.c. I have
verified that it also exists in 4-STABLE. When using PPP encapsulation and
header compression, m->m_pkthdr.len is never adjusted after the call to
sl_compress_tcp(). Included is a patch against 4-STABLE that seems to fix
the problem.
regards,
jacques
--- if_spppsubr.c.orig Mon Sep 29 14:12:17 2003
+++ if_spppsubr.c Mon Sep 29 14:17:31 2003
@@ -778,6 +778,7 @@
int s, rv = 0;
int ipproto = PPP_IP;
int debug = ifp->if_flags & IFF_DEBUG;
+ int uc_len;
s = splimp();
@@ -864,7 +865,9 @@
* Do IP Header compression
*/
if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
- ip->ip_p == IPPROTO_TCP)
+ ip->ip_p == IPPROTO_TCP) {
+ uc_len = m->m_len;
+
switch (sl_compress_tcp(m, ip, sp->pp_comp,
sp->ipcp.compress_cid)) {
case TYPE_COMPRESSED_TCP:
@@ -881,6 +884,10 @@
splx(s);
return (EINVAL);
}
+
+ if (m->m_flags & M_PKTHDR)
+ m->m_pkthdr.len += m->m_len - uc_len;
+ }
}
#endif
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