/*
* Drop connection, reporting
* the specified error.
*/
void
ipx_drop(struct ipxpcb *ipxp, int errno)
{
struct socket *so = ipxp->ipxp_socket;
IPX_LIST_LOCK_ASSERT();
IPX_LOCK_ASSERT(ipxp);
/*
* someday, in the IPX world
* we will generate error protocol packets
* announcing that the socket has gone away.
*
* XXX Probably never. IPX does not have error packets.
*/
/*if (TCPS_HAVERCVDSYN(tp->t_state)) {
tp->t_state = TCPS_CLOSED;
tcp_output(tp);
}*/
so->so_error = errno;
ipx_pcbdisconnect(ipxp);
soisdisconnected(so);
}
void
spx_input(struct mbuf *m, struct ipxpcb *ipxp)
{
struct spxpcb *cb;
struct spx *si = mtod(m, struct spx *);
struct socket *so;
struct spx spx_savesi;
int dropsocket = 0;
short ostate = 0;
spxstat.spxs_rcvtotal++;
KASSERT(ipxp != NULL, ("spx_input: ipxpcb == NULL"));
/*
* spx_input() assumes that the caller will hold both the pcb list
* lock and also the ipxp lock. spx_input() will release both before
* returning, and may in fact trade in the ipxp lock for another pcb
* lock following sonewconn().
*/
IPX_LIST_LOCK_ASSERT();
IPX_LOCK_ASSERT(ipxp);
cb = ipxtospxpcb(ipxp);
KASSERT(cb != NULL, ("spx_input: cb == NULL"));
if (ipxp->ipxp_flags & IPXP_DROPPED)
goto drop;
if (m->m_len < sizeof(*si)) {
if ((m = m_pullup(m, sizeof(*si))) == NULL) {
IPX_UNLOCK(ipxp);
IPX_LIST_UNLOCK();
spxstat.spxs_rcvshort++;
return;
}
si = mtod(m, struct spx *);
}
si->si_seq = ntohs(si->si_seq);
si->si_ack = ntohs(si->si_ack);
si->si_alo = ntohs(si->si_alo);
so = ipxp->ipxp_socket;
KASSERT(so != NULL, ("spx_input: so == NULL"));
#ifdef MAC
if (mac_socket_check_deliver(so, m) != 0)
goto drop;
#endif
if (so->so_options & SO_DEBUG || traceallspxs) {
ostate = cb->s_state;
spx_savesi = *si;
}
if (so->so_options & SO_ACCEPTCONN) {
struct spxpcb *ocb = cb;
so = sonewconn(so, 0);
if (so == NULL)
goto drop;
/*
* This is ugly, but ....
*
* Mark socket as temporary until we're committed to keeping
* it. The code at ``drop'' and ``dropwithreset'' check the
* flag dropsocket to see if the temporary socket created
* here should be discarded. We mark the socket as
* discardable until we're committed to it below in
* TCPS_LISTEN.
*
* XXXRW: In the new world order of real kernel parallelism,
* temporarily allocating the socket when we're "not sure"
* seems like a bad idea, as we might race to remove it if
* the listen socket is closed...?
*
* We drop the lock of the listen socket ipxp, and acquire
* the lock of the new socket ippx.
*/
dropsocket++;
IPX_UNLOCK(ipxp);
ipxp = (struct ipxpcb *)so->so_pcb;
IPX_LOCK(ipxp);
ipxp->ipxp_laddr = si->si_dna;
cb = ipxtospxpcb(ipxp);
cb->s_mtu = ocb->s_mtu; /* preserve sockopts */
cb->s_flags = ocb->s_flags; /* preserve sockopts */
cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */
cb->s_state = TCPS_LISTEN;
}
IPX_LOCK_ASSERT(ipxp);
/*
* Packet received on connection. Reset idle time and keep-alive
* timer.
*/
cb->s_idle = 0;
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
switch (cb->s_state) {
case TCPS_LISTEN:{
struct sockaddr_ipx *sipx, ssipx;
struct ipx_addr laddr;
/*
* If somebody here was carying on a conversation and went
* away, and his pen pal thinks he can still talk, we get the
* misdirected packet.
*/
if (spx_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
spx_istat.gonawy++;
goto dropwithreset;
}
sipx = &ssipx;
bzero(sipx, sizeof *sipx);
sipx->sipx_len = sizeof(*sipx);
sipx->sipx_family = AF_IPX;
sipx->sipx_addr = si->si_sna;
laddr = ipxp->ipxp_laddr;
if (ipx_nullhost(laddr))
ipxp->ipxp_laddr = si->si_dna;
if (ipx_pcbconnect(ipxp, (struct sockaddr *)sipx, &thread0)) {
ipxp->ipxp_laddr = laddr;
spx_istat.noconn++;
goto drop;
}
spx_template(cb);
dropsocket = 0; /* committed to socket */
cb->s_did = si->si_sid;
cb->s_rack = si->si_ack;
cb->s_ralo = si->si_alo;
#define THREEWAYSHAKE
#ifdef THREEWAYSHAKE
cb->s_state = TCPS_SYN_RECEIVED;
cb->s_force = 1 + SPXT_KEEP;
spxstat.spxs_accepts++;
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
}
break;
case TCPS_SYN_RECEIVED: {
/*
* This state means that we have heard a response to our
* acceptance of their connection. It is probably logically
* unnecessary in this implementation.
*/
if (si->si_did != cb->s_sid) {
spx_istat.wrncon++;
goto drop;
}
#endif
ipxp->ipxp_fport = si->si_sport;
cb->s_timer[SPXT_REXMT] = 0;
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
soisconnected(so);
cb->s_state = TCPS_ESTABLISHED;
spxstat.spxs_accepts++;
}
break;
case TCPS_SYN_SENT:
/*
* This state means that we have gotten a response to our
* attempt to establish a connection. We fill in the data
* from the other side, telling us which port to respond to,
* instead of the well-known one we might have sent to in the
* first place. We also require that this is a response to
* our connection id.
*/
if (si->si_did != cb->s_sid) {
spx_istat.notme++;
goto drop;
}
spxstat.spxs_connects++;
cb->s_did = si->si_sid;
cb->s_rack = si->si_ack;
cb->s_ralo = si->si_alo;
cb->s_dport = ipxp->ipxp_fport = si->si_sport;
cb->s_timer[SPXT_REXMT] = 0;
cb->s_flags |= SF_ACKNOW;
soisconnected(so);
cb->s_state = TCPS_ESTABLISHED;
/*
* Use roundtrip time of connection request for initial rtt.
*/
if (cb->s_rtt) {
cb->s_srtt = cb->s_rtt << 3;
cb->s_rttvar = cb->s_rtt << 1;
SPXT_RANGESET(cb->s_rxtcur,
((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
SPXTV_MIN, SPXTV_REXMTMAX);
cb->s_rtt = 0;
}
}
