FreeBSD-5.3/sys/netatm/uni/uniarp_vcm.c
/*
* ===================================
* 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.
*/
/*
* ATM Forum UNI Support
* ---------------------
*
* UNI ATMARP support (RFC1577) - Virtual Channel Management
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/netatm/uni/uniarp_vcm.c,v 1.14 2003/07/23 14:28:57 harti Exp $");
#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 <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.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_ioctl.h>
#include <netatm/atm_stack.h>
#include <netatm/atm_pcb.h>
#include <netatm/atm_var.h>
#include <netatm/ipatm/ipatm_var.h>
#include <netatm/ipatm/ipatm_serv.h>
#include <netatm/uni/uniip_var.h>
#include <vm/uma.h>
extern uma_zone_t unisig_vc_zone;
/*
* Local variables
*/
static struct attr_llc uniarp_llc = {
T_ATM_PRESENT,
{
T_ATM_LLC_SHARING,
8,
{0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x08, 0x06}
}
};
static struct t_atm_cause uniarp_cause = {
T_ATM_ITU_CODING,
T_ATM_LOC_USER,
T_ATM_CAUSE_TEMPORARY_FAILURE,
{0, 0, 0, 0}
};
/*
* Process a new PVC requiring ATMARP support
*
* This function is called after IP/ATM has successfully opened a PVC which
* requires ATMARP support. We will send an InATMARP request over the PVC
* to elicit a response from the PVC's ATMARP peer informing us of its
* network address. This information will also be used by IP/ATM in order
* to complete its address-to-VC mapping table.
*
* Arguments:
* ivp pointer to PVC's IPVCC control block
*
* Returns:
* MAP_PROCEEDING - OK so far, querying for peer's mapping
* MAP_FAILED - error, unable to allocate resources
*
*/
int
uniarp_pvcopen(ivp)
struct ipvcc *ivp;
{
struct uniip *uip;
struct uniarp *uap;
int s, err;
ATM_DEBUG1("uniarp_pvcopen: ivp=%p\n", ivp);
ivp->iv_arpent = NULL;
/*
* Check things out
*/
if ((ivp->iv_flags & IVF_LLC) == 0)
return (MAP_FAILED);
/*
* Get uni interface
*/
uip = (struct uniip *)ivp->iv_ipnif->inf_isintf;
if (uip == NULL)
return (MAP_FAILED);
/*
* Get an arp map entry
*/
uap = uma_zalloc(uniarp_zone, M_WAITOK | M_ZERO);
if (uap == NULL)
return (MAP_FAILED);
/*
* Create our CM connection
*/
err = atm_cm_addllc(&uniarp_endpt, ivp, &uniarp_llc,
ivp->iv_conn, &ivp->iv_arpconn);
if (err) {
/*
* We don't take no (or maybe) for an answer
*/
if (ivp->iv_arpconn) {
(void) atm_cm_release(ivp->iv_arpconn, &uniarp_cause);
ivp->iv_arpconn = NULL;
}
uma_zfree(uniarp_zone, uap);
return (MAP_FAILED);
}
/*
* Get map entry set up
*/
s = splnet();
uap->ua_dstatm.address_format = T_ATM_ABSENT;
uap->ua_dstatmsub.address_format = T_ATM_ABSENT;
uap->ua_intf = uip;
/*
* Put ivp on arp entry chain
*/
LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
ivp->iv_arpent = (struct arpmap *)uap;
/*
* Put arp entry on pvc chain
*/
LINK2TAIL(uap, struct uniarp, uniarp_pvctab, ua_next);
/*
* Send Inverse ATMARP request
*/
(void) uniarp_inarp_req(uip, &uap->ua_dstatm, &uap->ua_dstatmsub, ivp);
/*
* Start resend timer
*/
uap->ua_aging = UNIARP_REVALID_AGE;
(void) splx(s);
return (MAP_PROCEEDING);
}
/*
* Process a new outgoing SVC requiring ATMARP support
*
* This function is called by the IP/ATM module to resolve a destination
* IP address to an ATM address in order to open an SVC to that destination.
* If a valid mapping is already in our cache, then we just tell the caller
* about it and that's that. Otherwise, we have to allocate a new arp entry
* and issue a query for the mapping.
*
* Arguments:
* ivp pointer to SVC's IPVCC control block
* dst pointer to destination IP address
*
* Returns:
* MAP_VALID - Got the answer, returned via iv_arpent field.
* MAP_PROCEEDING - OK so far, querying for peer's mapping
* MAP_FAILED - error, unable to allocate resources
*
*/
int
uniarp_svcout(ivp, dst)
struct ipvcc *ivp;
struct in_addr *dst;
{
struct uniip *uip;
struct uniarp *uap;
int s = splnet();
ATM_DEBUG2("uniarp_svcout: ivp=%p,dst=0x%x\n", ivp, dst->s_addr);
ivp->iv_arpent = NULL;
/*
* Get uni interface
*/
uip = (struct uniip *)ivp->iv_ipnif->inf_isintf;
if (uip == NULL) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Lookup IP destination address
*/
UNIARP_LOOKUP(dst->s_addr, uap);
if (uap) {
/*
* We've got an entry, verify interface
*/
if (uap->ua_intf != uip) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Chain this vcc onto entry
*/
LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
ivp->iv_arpent = (struct arpmap *)uap;
uap->ua_flags |= UAF_USED;
if (uap->ua_flags & UAF_VALID) {
/*
* Entry is valid, we're done
*/
(void) splx(s);
return (MAP_VALID);
} else {
/*
* We're already looking for this address
*/
(void) splx(s);
return (MAP_PROCEEDING);
}
}
/*
* No info in the cache. If we're the server, then
* we're already authoritative, so just deny request.
* If we're a client but the server VCC isn't open we
* also deny the request.
*/
if (uip->uip_arpstate != UIAS_CLIENT_ACTIVE) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* We're a client with an open VCC to the server, get a new arp entry
* May be called from timeout - don't wait.
*/
uap = uma_zalloc(uniarp_zone, M_NOWAIT);
if (uap == NULL) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Get entry set up
*/
uap->ua_dstip.s_addr = dst->s_addr;
uap->ua_dstatm.address_format = T_ATM_ABSENT;
uap->ua_dstatm.address_length = 0;
uap->ua_dstatmsub.address_format = T_ATM_ABSENT;
uap->ua_dstatmsub.address_length = 0;
uap->ua_intf = uip;
/*
* Link ipvcc to arp entry for later notification
*/
LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
ivp->iv_arpent = (struct arpmap *)uap;
uap->ua_flags |= UAF_USED;
/*
* Add arp entry to table
*/
UNIARP_ADD(uap);
/*
* Issue arp request for this address
*/
(void) uniarp_arp_req(uip, dst);
/*
* Start retry timer
*/
UNIARP_TIMER(uap, UNIARP_ARP_RETRY);
(void) splx(s);
return (MAP_PROCEEDING);
}
/*
* Process a new incoming SVC requiring ATMARP support
*
* This function is called by the IP/ATM module to resolve a caller's ATM
* address to its IP address for an incoming call in order to allow a
* bi-directional flow of IP packets on the SVC. If a valid mapping is
* already in our cache, then we will use it. Otherwise, we have to allocate
* a new arp entry and wait for the SVC to become active so that we can issue
* an InATMARP to the peer.
*
* Arguments:
* ivp pointer to SVC's IPVCC control block
* dst pointer to caller's ATM address
* dstsub pointer to caller's ATM subaddress
*
* Returns:
* MAP_VALID - Got the answer, returned via iv_arpent field.
* MAP_PROCEEDING - OK so far, querying for peer's mapping
* MAP_FAILED - error, unable to allocate resources
*
*/
int
uniarp_svcin(ivp, dst, dstsub)
struct ipvcc *ivp;
Atm_addr *dst;
Atm_addr *dstsub;
{
struct uniip *uip;
struct uniarp *uap;
int found = 0, i, s = splnet();
ATM_DEBUG1("uniarp_svcin: ivp=%p\n", ivp);
/*
* Clear ARP entry field
*/
ivp->iv_arpent = NULL;
/*
* Check things out
*/
if ((ivp->iv_flags & IVF_LLC) == 0)
return (MAP_FAILED);
/*
* Get uni interface
*/
uip = (struct uniip *)ivp->iv_ipnif->inf_isintf;
if (uip == NULL) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Make sure we're configured as a client or server
*/
if (uip->uip_arpstate == UIAS_NOTCONF) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* If we know the caller's ATM address, look it up
*/
uap = NULL;
if (dst->address_format != T_ATM_ABSENT) {
for (i = 0; (i < UNIARP_HASHSIZ) && (found == 0); i++) {
for (uap = uniarp_arptab[i]; uap; uap = uap->ua_next) {
if (ATM_ADDR_EQUAL(dst, &uap->ua_dstatm) &&
ATM_ADDR_EQUAL(dstsub, &uap->ua_dstatmsub)){
found = 1;
break;
}
}
}
if (uap == NULL) {
for (uap = uniarp_nomaptab; uap; uap = uap->ua_next) {
if (ATM_ADDR_EQUAL(dst, &uap->ua_dstatm) &&
ATM_ADDR_EQUAL(dstsub, &uap->ua_dstatmsub))
break;
}
}
}
if (uap) {
/*
* We've got an entry, verify interface
*/
if (uap->ua_intf != uip) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Chain the vcc onto this entry
*/
LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
ivp->iv_arpent = (struct arpmap *)uap;
uap->ua_flags |= UAF_USED;
if (uap->ua_flags & UAF_VALID) {
/*
* Entry is valid, we're done
*/
(void) splx(s);
return (MAP_VALID);
} else {
/*
* We're already looking for this address
*/
(void) splx(s);
return (MAP_PROCEEDING);
}
}
/*
* No info in the cache - get a new arp entry
* May be called from timeout - don't wait.
*/
uap = uma_zalloc(uniarp_zone, M_NOWAIT | M_ZERO);
if (uap == NULL) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Get entry set up
*/
ATM_ADDR_COPY(dst, &uap->ua_dstatm);
ATM_ADDR_COPY(dstsub, &uap->ua_dstatmsub);
uap->ua_intf = uip;
/*
* Link ipvcc to arp entry for later notification
*/
LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
ivp->iv_arpent = (struct arpmap *)uap;
uap->ua_flags |= UAF_USED;
/*
* Add arp entry to 'nomap' table
*/
LINK2TAIL(uap, struct uniarp, uniarp_nomaptab, ua_next);
(void) splx(s);
/*
* Now we just wait for SVC to become active
*/
return (MAP_PROCEEDING);
}
/*
* Process ARP SVC activation notification
*
* This function is called by the IP/ATM module whenever a previously
* opened SVC has successfully been connected.
*
* Arguments:
* ivp pointer to SVC's IPVCC control block
*
* Returns:
* 0 activation processing successful
* errno activation failed - reason indicated
*
*/
int
uniarp_svcactive(ivp)
struct ipvcc *ivp;
{
struct ip_nif *inp;
struct uniip *uip;
struct uniarp *uap;
int err, s = splnet();
ATM_DEBUG1("uniarp_svcactive: ivp=%p\n", ivp);
inp = ivp->iv_ipnif;
uip = (struct uniip *)inp->inf_isintf;
uap = (struct uniarp *)ivp->iv_arpent;
/*
* First, we need to create our CM connection
*/
err = atm_cm_addllc(&uniarp_endpt, ivp, &uniarp_llc,
ivp->iv_conn, &ivp->iv_arpconn);
if (err) {
/*
* We don't take no (or maybe) for an answer
*/
if (ivp->iv_arpconn) {
(void) atm_cm_release(ivp->iv_arpconn, &uniarp_cause);
ivp->iv_arpconn = NULL;
}
return (err);
}
/*
* Is this the client->server vcc??
*/
if (uip->uip_arpsvrvcc == ivp) {
/*
* Yep, go into the client registration phase
*/
uip->uip_arpstate = UIAS_CLIENT_REGISTER;
/*
* To register ourselves, RFC1577 says we should wait
* around for the server to send us an InATMARP_Request.
* However, draft-1577+ just has us send an ATMARP_Request
* for our own address. To keep everyone happy, we'll go
* with both and see what works!
*/
(void) uniarp_arp_req(uip, &(IA_SIN(inp->inf_addr)->sin_addr));
/*
* Start retry timer
*/
UNIIP_ARP_TIMER(uip, 1 * ATM_HZ);
(void) splx(s);
return (0);
}
/*
* Send an InATMARP_Request on this VCC to find out/notify who's at
* the other end. If we're the server, this will start off the
* RFC1577 registration procedure. If we're a client, then this
* SVC is for user data and it's pretty likely that both ends are
* going to be sending packets. So, if we're the caller, we'll be
* nice and let the callee know right away who we are. If we're the
* callee, let's find out asap the caller's IP address.
*/
(void) uniarp_inarp_req(uip, &uap->ua_dstatm, &uap->ua_dstatmsub, ivp);
/*
* Start retry timer if entry isn't valid yet
*/
if (((uap->ua_flags & UAF_VALID) == 0) &&
((uap->ua_time.ti_flag & TIF_QUEUED) == 0))
UNIARP_TIMER(uap, UNIARP_ARP_RETRY);
(void) splx(s);
return (0);
}
/*
* Process VCC close
*
* This function is called just prior to IP/ATM closing a VCC which
* supports ATMARP. We'll sever our links to the VCC and then
* figure out how much more cleanup we need to do for now.
*
* Arguments:
* ivp pointer to VCC's IPVCC control block
*
* Returns:
* none
*
*/
void
uniarp_vcclose(ivp)
struct ipvcc *ivp;
{
struct uniip *uip;
struct uniarp *uap;
int s;
ATM_DEBUG1("uniarp_vcclose: ivp=%p\n", ivp);
/*
* Close our CM connection
*/
if (ivp->iv_arpconn) {
(void) atm_cm_release(ivp->iv_arpconn, &uniarp_cause);
ivp->iv_arpconn = NULL;
}
/*
* Get atmarp entry
*/
if ((uap = (struct uniarp *)ivp->iv_arpent) == NULL)
return;
uip = uap->ua_intf;
s = splnet();
/*
* If this is the arpserver VCC, then schedule ourselves to
* reopen the connection soon
*/
if (uip->uip_arpsvrvcc == ivp) {
uip->uip_arpsvrvcc = NULL;
uip->uip_arpstate = UIAS_CLIENT_POPEN;
UNIIP_ARP_CANCEL(uip);
UNIIP_ARP_TIMER(uip, 5 * ATM_HZ);
}
/*
* Remove IP VCC from chain
*/
UNLINK(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
/*
* SVCs and PVCs are handled separately
*/
if (ivp->iv_flags & IVF_SVC) {
/*
* If the mapping is currently valid or in use, or if there
* are other VCCs still using this mapping, we're done for now
*/
if ((uap->ua_flags & (UAF_VALID | UAF_LOCKED)) ||
(uap->ua_origin >= UAO_PERM) ||
(uap->ua_ivp != NULL)) {
(void) splx(s);
return;
}
/*
* Unlink the entry
*/
if (uap->ua_dstip.s_addr == 0) {
UNLINK(uap, struct uniarp, uniarp_nomaptab, ua_next);
} else {
UNIARP_DELETE(uap);
}
} else {
/*
* Remove entry from pvc table
*/
UNLINK(uap, struct uniarp, uniarp_pvctab, ua_next);
}
UNIARP_CANCEL(uap);
/*
* Finally, free the entry
*/
uma_zfree(uniarp_zone, uap);
(void) splx(s);
return;
}
/*
* Process ATMARP VCC Connected Notification
*
* Arguments:
* toku owner's connection token (ipvcc protocol block)
*
* Returns:
* none
*
*/
void
uniarp_connected(toku)
void *toku;
{
/*
* Since we only do atm_cm_addllc()'s on active connections,
* we should never get called here...
*/
panic("uniarp_connected");
}
/*
* Process ATMARP VCC Cleared Notification
*
* Arguments:
* toku owner's connection token (ipvcc protocol block)
* cause pointer to cause code
*
* Returns:
* none
*
*/
void
uniarp_cleared(toku, cause)
void *toku;
struct t_atm_cause *cause;
{
struct ipvcc *ivp = toku;
int s;
s = splnet();
/*
* We're done with VCC
*/
ivp->iv_arpconn = NULL;
/*
* If IP is finished with VCC, then we'll free it
*/
if (ivp->iv_state == IPVCC_FREE)
uma_zfree(unisig_vc_zone, ivp);
(void) splx(s);
}