freebsd-dev/sys/netatm/ipatm/ipatm_event.c

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/*
*
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*
1999-08-28 01:08:13 +00:00
* @(#) $FreeBSD$
*
*/
/*
* IP Over ATM Support
* -------------------
*
* IP VCC event handler
*
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netatm/port.h>
#include <netatm/queue.h>
#include <netatm/atm.h>
#include <netatm/atm_sys.h>
#include <netatm/atm_sap.h>
#include <netatm/atm_cm.h>
#include <netatm/atm_if.h>
#include <netatm/atm_stack.h>
#include <netatm/atm_pcb.h>
#include <netatm/atm_var.h>
#include <netatm/ipatm/ipatm.h>
#include <netatm/ipatm/ipatm_var.h>
#include <netatm/ipatm/ipatm_serv.h>
#ifndef lint
1999-08-28 01:08:13 +00:00
__RCSID("@(#) $FreeBSD$");
#endif
/*
* Process an IP VCC timeout
*
* Called when a previously scheduled ipvcc control block timer expires.
* Processing will be based on the current ipvcc state.
*
* Called at splnet.
*
* Arguments:
* tip pointer to ipvcc timer control block
*
* Returns:
* none
*
*/
void
ipatm_timeout(tip)
struct atm_time *tip;
{
struct ipvcc *ivp;
/*
* Back-off to ipvcc control block
*/
ivp = (struct ipvcc *)
((caddr_t)tip - (int)(&((struct ipvcc *)0)->iv_time));
/*
* Process timeout based on protocol state
*/
switch (ivp->iv_state) {
case IPVCC_PMAP:
/*
* Give up waiting for arp response
*/
(void) ipatm_closevc(ivp, T_ATM_CAUSE_TEMPORARY_FAILURE);
break;
case IPVCC_POPEN:
case IPVCC_PACCEPT:
/*
* Give up waiting for signalling manager response
*/
(void) ipatm_closevc(ivp, T_ATM_CAUSE_TEMPORARY_FAILURE);
break;
case IPVCC_ACTPENT:
/*
* Try again to get an ARP entry
*/
switch ((*ivp->iv_ipnif->inf_serv->is_arp_pvcopen)(ivp)) {
case MAP_PROCEEDING:
/*
* Wait for answer
*/
ivp->iv_state = IPVCC_ACTIVE;
break;
case MAP_VALID:
/*
* We've got our answer already
*/
ivp->iv_state = IPVCC_ACTIVE;
ivp->iv_flags |= IVF_MAPOK;
ivp->iv_dst.s_addr = ivp->iv_arpent->am_dstip.s_addr;
break;
case MAP_FAILED:
/*
* Try again later
*/
IPVCC_TIMER(ivp, 5 * ATM_HZ);
break;
default:
panic("ipatm_timeout: invalid am_pvcopen return");
}
break;
default:
log(LOG_ERR, "ipatm: invalid timer state: ivp=%p, state=%d\n",
ivp, ivp->iv_state);
}
}
/*
* Process IP VCC Connected Notification
*
* Arguments:
* toku owner's connection token (ipvcc protocol block)
*
* Returns:
* none
*
*/
void
ipatm_connected(toku)
void *toku;
{
struct ipvcc *ivp = (struct ipvcc *)toku;
/*
* SVC is connected
*/
if ((ivp->iv_state != IPVCC_POPEN) &&
(ivp->iv_state != IPVCC_PACCEPT)) {
log(LOG_ERR, "ipatm: invalid CALL_CONNECTED state=%d\n",
ivp->iv_state);
return;
}
/*
* Verify possible negotiated parameter values
*/
if (ivp->iv_state == IPVCC_POPEN) {
Atm_attributes *ap = &ivp->iv_conn->co_connvc->cvc_attr;
int mtu = (ivp->iv_flags & IVF_LLC) ?
ATM_NIF_MTU + IPATM_LLC_LEN :
ATM_NIF_MTU;
/*
* Verify final MTU
*/
if (ap->aal.type == ATM_AAL5) {
if ((ap->aal.v.aal5.forward_max_SDU_size < mtu) ||
(ap->aal.v.aal5.backward_max_SDU_size > mtu)) {
(void) ipatm_closevc(ivp,
T_ATM_CAUSE_AAL_PARAMETERS_NOT_SUPPORTED);
return;
}
} else {
if ((ap->aal.v.aal4.forward_max_SDU_size < mtu) ||
(ap->aal.v.aal4.backward_max_SDU_size > mtu)) {
(void) ipatm_closevc(ivp,
T_ATM_CAUSE_AAL_PARAMETERS_NOT_SUPPORTED);
return;
}
}
}
/*
* Finish up VCC activation
*/
ipatm_activate(ivp);
}
/*
* Process IP VCC Cleared Notification
*
* Arguments:
* toku owner's connection token (ipvcc protocol block)
* cause pointer to cause code
*
* Returns:
* none
*
*/
void
ipatm_cleared(toku, cause)
void *toku;
struct t_atm_cause *cause;
{
struct ipvcc *ivp = (struct ipvcc *)toku;
/*
* VCC has been cleared, so figure out what's next
*/
ivp->iv_conn = NULL;
switch (ivp->iv_state) {
case IPVCC_POPEN:
/*
* Call setup failed, see if there is another
* set of vcc parameters to try
*/
ivp->iv_state = IPVCC_CLOSED;
if (ipatm_retrysvc(ivp)) {
(void) ipatm_closevc(ivp, cause->cause_value);
}
break;
case IPVCC_PACCEPT:
case IPVCC_ACTPENT:
case IPVCC_ACTIVE:
ivp->iv_state = IPVCC_CLOSED;
(void) ipatm_closevc(ivp, cause->cause_value);
break;
}
}
/*
* Process an ARP Event Notification
*
* Arguments:
* ivp pointer to IP VCC control block
* event ARP event type
*
* Returns:
* none
*
*/
void
ipatm_arpnotify(ivp, event)
struct ipvcc *ivp;
int event;
{
struct sockaddr_in sin;
struct ifnet *ifp;
/*
* Process event
*/
switch (event) {
case MAP_VALID:
switch (ivp->iv_state) {
case IPVCC_PMAP:
/*
* We've got our destination, however, first we'll
* check to make sure no other VCC to our destination
* has also had it's ARP table entry completed.
* If we don't find a better VCC to use, then we'll
* go ahead and open this SVC.
*/
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = ivp->iv_dst.s_addr;
if (ipatm_iptovc(&sin, ivp->iv_ipnif->inf_nif) != ivp) {
/*
* We found a better VCC, so use it and
* get rid of this VCC
*/
if (ivp->iv_queue) {
ifp = (struct ifnet *)
ivp->iv_ipnif->inf_nif;
(void) ipatm_ifoutput(ifp,
ivp->iv_queue,
(struct sockaddr *)&sin);
ivp->iv_queue = NULL;
}
(void) ipatm_closevc(ivp,
T_ATM_CAUSE_UNSPECIFIED_NORMAL);
} else {
/*
* We like this VCC...
*/
ivp->iv_flags |= IVF_MAPOK;
if (ipatm_opensvc(ivp)) {
(void) ipatm_closevc(ivp,
T_ATM_CAUSE_TEMPORARY_FAILURE);
}
}
break;
case IPVCC_POPEN:
case IPVCC_PACCEPT:
case IPVCC_ACTIVE:
/*
* Everything looks good, so accept new mapping
*/
ivp->iv_flags |= IVF_MAPOK;
ivp->iv_dst.s_addr = ivp->iv_arpent->am_dstip.s_addr;
/*
* Send queued packet
*/
if ((ivp->iv_state == IPVCC_ACTIVE) && ivp->iv_queue) {
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = ivp->iv_dst.s_addr;
ifp = (struct ifnet *)ivp->iv_ipnif->inf_nif;
(void) ipatm_ifoutput(ifp, ivp->iv_queue,
(struct sockaddr *)&sin);
ivp->iv_queue = NULL;
}
break;
}
break;
case MAP_INVALID:
switch (ivp->iv_state) {
case IPVCC_POPEN:
case IPVCC_PACCEPT:
case IPVCC_ACTIVE:
/*
* Mapping has gone stale, so we cant use this VCC
* until the mapping is refreshed
*/
ivp->iv_flags &= ~IVF_MAPOK;
break;
}
break;
case MAP_FAILED:
/*
* ARP lookup failed, just trash it all
*/
(void) ipatm_closevc(ivp, T_ATM_CAUSE_TEMPORARY_FAILURE);
break;
case MAP_CHANGED:
/*
* ARP mapping has changed
*/
if (ivp->iv_flags & IVF_PVC) {
/*
* For PVCs, just reset lookup cache if needed
*/
if (last_map_ipvcc == ivp) {
last_map_ipdst = 0;
last_map_ipvcc = NULL;
}
} else {
/*
* Close SVC if it has already used this mapping
*/
switch (ivp->iv_state) {
case IPVCC_POPEN:
case IPVCC_ACTIVE:
(void) ipatm_closevc(ivp,
T_ATM_CAUSE_UNSPECIFIED_NORMAL);
break;
}
}
break;
default:
log(LOG_ERR, "ipatm: unknown arp event %d, ivp=%p\n",
event, ivp);
}
}
/*
* Process an IP VCC idle timer tick
*
* This function is called every IPATM_IDLE_TIME seconds, in order to
* scan for idle IP VCC's. If an active VCC reaches the idle time limit,
* then it will be closed.
*
* Called at splnet.
*
* Arguments:
* tip pointer to the VCC idle timer control block
*
* Returns:
* none
*
*/
void
ipatm_itimeout(tip)
struct atm_time *tip;
{
struct ipvcc *ivp, *inext;
struct ip_nif *inp;
/*
* Schedule next timeout
*/
atm_timeout(&ipatm_itimer, IPATM_IDLE_TIME, ipatm_itimeout);
/*
* Check for disabled idle timeout
*/
if (ipatm_vcidle == 0)
return;
/*
* Check out all IP VCCs
*/
for (inp = ipatm_nif_head; inp; inp = inp->inf_next) {
for (ivp = Q_HEAD(inp->inf_vcq, struct ipvcc); ivp;
ivp = inext) {
inext = Q_NEXT(ivp, struct ipvcc, iv_elem);
/*
* Looking for active, idle SVCs
*/
if (ivp->iv_flags & (IVF_PVC | IVF_NOIDLE))
continue;
if (ivp->iv_state != IPVCC_ACTIVE)
continue;
if (++ivp->iv_idle < ipatm_vcidle)
continue;
/*
* OK, we found one - close the VCC
*/
(void) ipatm_closevc(ivp,
T_ATM_CAUSE_UNSPECIFIED_NORMAL);
}
}
}