void EInterfaces::recalculate_mtu(void)
{
UInt32 Min_MTU;
int n;
Min_MTU = 0;
for(n=0; n<numberof(m_aInterfaces); n++)
{
if ( m_aInterfaces[n].m_fEnabled )
{
if ( Min_MTU )
Min_MTU = MIN(ifnet_mtu(m_aInterfaces[n].m_ifnet), Min_MTU);
else
Min_MTU = ifnet_mtu(m_aInterfaces[n].m_ifnet);
}
}
if ( 0==Min_MTU )
{
debugError("Error in MTU calculation.\n");
m_Min_MTU = 1500; // Set to standard MTU size
}
m_Min_MTU = Min_MTU;
debug("Minimum MTU of %d interface(s) is %d bytes\n", m_nInterfacesInUse, m_Min_MTU);
}
/* -----------------------------------------------------------------------------
Handle a CCP packet. `rcvd' is 1 if the packet was received,
0 if it is about to be transmitted.
mbuf points to the ccp payload (doesn't include FF03 and 80FD)
----------------------------------------------------------------------------- */
void ppp_comp_ccp(struct ppp_if *wan, mbuf_t m, int rcvd)
{
u_char *p = mbuf_data(m);
int slen;
slen = CCP_LENGTH(p);
if (slen > mbuf_pkthdr_len(m)) {
LOGDBG(wan->net, ("ppp_comp_ccp: not enough data in mbuf (expected = %d, got = %d)\n",
slen, mbuf_pkthdr_len(m)));
return;
}
switch (CCP_CODE(p)) {
case CCP_CONFREQ:
case CCP_TERMREQ:
case CCP_TERMACK:
/* CCP must be going down - disable compression */
wan->sc_flags &= ~(rcvd ? SC_COMP_RUN : SC_DECOMP_RUN);
break;
case CCP_CONFACK:
if (wan->sc_flags & SC_CCP_OPEN && !(wan->sc_flags & SC_CCP_UP)
&& slen >= CCP_HDRLEN + CCP_OPT_MINLEN
&& slen >= CCP_OPT_LENGTH(p + CCP_HDRLEN) + CCP_HDRLEN) {
if (rcvd) {
/* peer is agreeing to send compressed packets. */
if (wan->rc_state
&& (*wan->rcomp->decomp_init)
(wan->rc_state, p + CCP_HDRLEN, slen - CCP_HDRLEN,
ifnet_unit(wan->net), 0, wan->mru, ifnet_flags(wan->net) & IFF_DEBUG)) {
wan->sc_flags |= SC_DECOMP_RUN;
wan->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
}
} else {
/* we're agreeing to send compressed packets. */
if (wan->xc_state
&& (*wan->xcomp->comp_init)
(wan->xc_state, p + CCP_HDRLEN, slen - CCP_HDRLEN,
ifnet_unit(wan->net), 0, ifnet_mtu(wan->net), ifnet_flags(wan->net) & IFF_DEBUG)) {
wan->sc_flags |= SC_COMP_RUN;
}
}
}
break;
case CCP_RESETACK:
if (wan->sc_flags & SC_CCP_UP) {
if (rcvd) {
if (wan->rc_state && (wan->sc_flags & SC_DECOMP_RUN)) {
(*wan->rcomp->decomp_reset)(wan->rc_state);
wan->sc_flags &= ~SC_DC_ERROR;
}
} else {
if (wan->xc_state && (wan->sc_flags & SC_COMP_RUN))
(*wan->xcomp->comp_reset)(wan->xc_state);
}
}
break;
}
}
