708 lines
15 KiB
C
708 lines
15 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $FreeBSD$
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*
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*/
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/*
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* ATM Forum UNI Support
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* ---------------------
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*
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* UNI ATMARP support (RFC1577) - Virtual Channel Management
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*
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*/
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#include <netatm/kern_include.h>
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#include <netatm/ipatm/ipatm_var.h>
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#include <netatm/ipatm/ipatm_serv.h>
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#include <netatm/uni/uniip_var.h>
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#ifndef lint
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__RCSID("@(#) $FreeBSD$");
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#endif
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/*
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* Local variables
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*/
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static struct attr_llc uniarp_llc = {
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T_ATM_PRESENT,
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{
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T_ATM_LLC_SHARING,
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8,
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{0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x08, 0x06}
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}
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};
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static struct t_atm_cause uniarp_cause = {
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T_ATM_ITU_CODING,
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T_ATM_LOC_USER,
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T_ATM_CAUSE_TEMPORARY_FAILURE,
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{0, 0, 0, 0}
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};
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/*
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* Process a new PVC requiring ATMARP support
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*
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* This function is called after IP/ATM has successfully opened a PVC which
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* requires ATMARP support. We will send an InATMARP request over the PVC
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* to elicit a response from the PVC's ATMARP peer informing us of its
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* network address. This information will also be used by IP/ATM in order
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* to complete its address-to-VC mapping table.
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*
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* Arguments:
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* ivp pointer to PVC's IPVCC control block
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*
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* Returns:
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* MAP_PROCEEDING - OK so far, querying for peer's mapping
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* MAP_FAILED - error, unable to allocate resources
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*
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*/
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int
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uniarp_pvcopen(ivp)
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struct ipvcc *ivp;
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{
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struct uniip *uip;
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struct uniarp *uap;
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int s, err;
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ATM_DEBUG1("uniarp_pvcopen: ivp=%p\n", ivp);
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ivp->iv_arpent = NULL;
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/*
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* Check things out
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*/
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if ((ivp->iv_flags & IVF_LLC) == 0)
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return (MAP_FAILED);
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/*
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* Get uni interface
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*/
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uip = (struct uniip *)ivp->iv_ipnif->inf_isintf;
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if (uip == NULL)
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return (MAP_FAILED);
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/*
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* Get an arp map entry
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*/
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uap = (struct uniarp *)atm_allocate(&uniarp_pool);
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if (uap == NULL)
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return (MAP_FAILED);
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/*
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* Create our CM connection
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*/
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err = atm_cm_addllc(&uniarp_endpt, ivp, &uniarp_llc,
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ivp->iv_conn, &ivp->iv_arpconn);
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if (err) {
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/*
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* We don't take no (or maybe) for an answer
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*/
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if (ivp->iv_arpconn) {
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(void) atm_cm_release(ivp->iv_arpconn, &uniarp_cause);
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ivp->iv_arpconn = NULL;
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}
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atm_free((caddr_t)uap);
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return (MAP_FAILED);
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}
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/*
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* Get map entry set up
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*/
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s = splnet();
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uap->ua_dstatm.address_format = T_ATM_ABSENT;
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uap->ua_dstatmsub.address_format = T_ATM_ABSENT;
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uap->ua_intf = uip;
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/*
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* Put ivp on arp entry chain
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*/
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LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
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ivp->iv_arpent = (struct arpmap *)uap;
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/*
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* Put arp entry on pvc chain
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*/
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LINK2TAIL(uap, struct uniarp, uniarp_pvctab, ua_next);
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/*
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* Send Inverse ATMARP request
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*/
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(void) uniarp_inarp_req(uip, &uap->ua_dstatm, &uap->ua_dstatmsub, ivp);
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/*
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* Start resend timer
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*/
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uap->ua_aging = UNIARP_REVALID_AGE;
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(void) splx(s);
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return (MAP_PROCEEDING);
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}
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/*
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* Process a new outgoing SVC requiring ATMARP support
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*
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* This function is called by the IP/ATM module to resolve a destination
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* IP address to an ATM address in order to open an SVC to that destination.
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* If a valid mapping is already in our cache, then we just tell the caller
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* about it and that's that. Otherwise, we have to allocate a new arp entry
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* and issue a query for the mapping.
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*
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* Arguments:
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* ivp pointer to SVC's IPVCC control block
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* dst pointer to destination IP address
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*
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* Returns:
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* MAP_VALID - Got the answer, returned via iv_arpent field.
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* MAP_PROCEEDING - OK so far, querying for peer's mapping
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* MAP_FAILED - error, unable to allocate resources
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*
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*/
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int
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uniarp_svcout(ivp, dst)
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struct ipvcc *ivp;
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struct in_addr *dst;
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{
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struct uniip *uip;
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struct uniarp *uap;
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int s = splnet();
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ATM_DEBUG2("uniarp_svcout: ivp=%p,dst=0x%x\n", ivp, dst->s_addr);
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ivp->iv_arpent = NULL;
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/*
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* Get uni interface
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*/
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uip = (struct uniip *)ivp->iv_ipnif->inf_isintf;
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if (uip == NULL) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* Lookup IP destination address
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*/
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UNIARP_LOOKUP(dst->s_addr, uap);
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if (uap) {
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/*
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* We've got an entry, verify interface
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*/
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if (uap->ua_intf != uip) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* Chain this vcc onto entry
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*/
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LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
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ivp->iv_arpent = (struct arpmap *)uap;
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uap->ua_flags |= UAF_USED;
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if (uap->ua_flags & UAF_VALID) {
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/*
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* Entry is valid, we're done
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*/
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(void) splx(s);
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return (MAP_VALID);
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} else {
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/*
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* We're already looking for this address
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*/
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(void) splx(s);
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return (MAP_PROCEEDING);
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}
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}
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/*
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* No info in the cache. If we're the server, then
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* we're already authoritative, so just deny request.
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* If we're a client but the server VCC isn't open we
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* also deny the request.
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*/
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if (uip->uip_arpstate != UIAS_CLIENT_ACTIVE) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* We're a client with an open VCC to the server, get a new arp entry
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*/
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uap = (struct uniarp *)atm_allocate(&uniarp_pool);
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if (uap == NULL) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* Get entry set up
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*/
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uap->ua_dstip.s_addr = dst->s_addr;
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uap->ua_dstatm.address_format = T_ATM_ABSENT;
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uap->ua_dstatm.address_length = 0;
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uap->ua_dstatmsub.address_format = T_ATM_ABSENT;
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uap->ua_dstatmsub.address_length = 0;
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uap->ua_intf = uip;
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/*
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* Link ipvcc to arp entry for later notification
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*/
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LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
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ivp->iv_arpent = (struct arpmap *)uap;
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uap->ua_flags |= UAF_USED;
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/*
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* Add arp entry to table
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*/
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UNIARP_ADD(uap);
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/*
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* Issue arp request for this address
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*/
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(void) uniarp_arp_req(uip, dst);
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/*
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* Start retry timer
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*/
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UNIARP_TIMER(uap, UNIARP_ARP_RETRY);
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(void) splx(s);
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return (MAP_PROCEEDING);
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}
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/*
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* Process a new incoming SVC requiring ATMARP support
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*
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* This function is called by the IP/ATM module to resolve a caller's ATM
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* address to its IP address for an incoming call in order to allow a
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* bi-directional flow of IP packets on the SVC. If a valid mapping is
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* already in our cache, then we will use it. Otherwise, we have to allocate
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* a new arp entry and wait for the SVC to become active so that we can issue
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* an InATMARP to the peer.
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*
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* Arguments:
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* ivp pointer to SVC's IPVCC control block
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* dst pointer to caller's ATM address
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* dstsub pointer to caller's ATM subaddress
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*
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* Returns:
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* MAP_VALID - Got the answer, returned via iv_arpent field.
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* MAP_PROCEEDING - OK so far, querying for peer's mapping
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* MAP_FAILED - error, unable to allocate resources
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*
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*/
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int
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uniarp_svcin(ivp, dst, dstsub)
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struct ipvcc *ivp;
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Atm_addr *dst;
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Atm_addr *dstsub;
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{
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struct uniip *uip;
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struct uniarp *uap;
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int found = 0, i, s = splnet();
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ATM_DEBUG1("uniarp_svcin: ivp=%p\n", ivp);
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/*
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* Clear ARP entry field
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*/
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ivp->iv_arpent = NULL;
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/*
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* Check things out
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*/
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if ((ivp->iv_flags & IVF_LLC) == 0)
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return (MAP_FAILED);
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/*
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* Get uni interface
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*/
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uip = (struct uniip *)ivp->iv_ipnif->inf_isintf;
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if (uip == NULL) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* Make sure we're configured as a client or server
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*/
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if (uip->uip_arpstate == UIAS_NOTCONF) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* If we know the caller's ATM address, look it up
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*/
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uap = NULL;
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if (dst->address_format != T_ATM_ABSENT) {
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for (i = 0; (i < UNIARP_HASHSIZ) && (found == 0); i++) {
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for (uap = uniarp_arptab[i]; uap; uap = uap->ua_next) {
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if (ATM_ADDR_EQUAL(dst, &uap->ua_dstatm) &&
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ATM_ADDR_EQUAL(dstsub, &uap->ua_dstatmsub)){
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found = 1;
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break;
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}
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}
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}
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if (uap == NULL) {
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for (uap = uniarp_nomaptab; uap; uap = uap->ua_next) {
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if (ATM_ADDR_EQUAL(dst, &uap->ua_dstatm) &&
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ATM_ADDR_EQUAL(dstsub, &uap->ua_dstatmsub))
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break;
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}
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}
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}
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if (uap) {
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/*
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* We've got an entry, verify interface
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*/
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if (uap->ua_intf != uip) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* Chain the vcc onto this entry
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*/
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LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
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ivp->iv_arpent = (struct arpmap *)uap;
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uap->ua_flags |= UAF_USED;
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if (uap->ua_flags & UAF_VALID) {
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/*
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* Entry is valid, we're done
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*/
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(void) splx(s);
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return (MAP_VALID);
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} else {
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/*
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* We're already looking for this address
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*/
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(void) splx(s);
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return (MAP_PROCEEDING);
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}
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}
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/*
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* No info in the cache - get a new arp entry
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*/
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uap = (struct uniarp *)atm_allocate(&uniarp_pool);
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if (uap == NULL) {
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(void) splx(s);
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return (MAP_FAILED);
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}
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/*
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* Get entry set up
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*/
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ATM_ADDR_COPY(dst, &uap->ua_dstatm);
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ATM_ADDR_COPY(dstsub, &uap->ua_dstatmsub);
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uap->ua_intf = uip;
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/*
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* Link ipvcc to arp entry for later notification
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*/
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LINK2TAIL(ivp, struct ipvcc, uap->ua_ivp, iv_arpnext);
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ivp->iv_arpent = (struct arpmap *)uap;
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uap->ua_flags |= UAF_USED;
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/*
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* Add arp entry to 'nomap' table
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*/
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LINK2TAIL(uap, struct uniarp, uniarp_nomaptab, ua_next);
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(void) splx(s);
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/*
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* Now we just wait for SVC to become active
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*/
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return (MAP_PROCEEDING);
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}
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/*
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* Process ARP SVC activation notification
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*
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* This function is called by the IP/ATM module whenever a previously
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* opened SVC has successfully been connected.
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*
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* Arguments:
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* ivp pointer to SVC's IPVCC control block
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*
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* Returns:
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* 0 activation processing successful
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* errno activation failed - reason indicated
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*
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*/
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int
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uniarp_svcactive(ivp)
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struct ipvcc *ivp;
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{
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struct ip_nif *inp;
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struct uniip *uip;
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struct uniarp *uap;
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int err, s = splnet();
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ATM_DEBUG1("uniarp_svcactive: ivp=%p\n", ivp);
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inp = ivp->iv_ipnif;
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uip = (struct uniip *)inp->inf_isintf;
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uap = (struct uniarp *)ivp->iv_arpent;
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/*
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* First, we need to create our CM connection
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*/
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err = atm_cm_addllc(&uniarp_endpt, ivp, &uniarp_llc,
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ivp->iv_conn, &ivp->iv_arpconn);
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if (err) {
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/*
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* We don't take no (or maybe) for an answer
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*/
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if (ivp->iv_arpconn) {
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(void) atm_cm_release(ivp->iv_arpconn, &uniarp_cause);
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ivp->iv_arpconn = NULL;
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}
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return (err);
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}
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/*
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* Is this the client->server vcc??
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*/
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if (uip->uip_arpsvrvcc == ivp) {
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/*
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* Yep, go into the client registration phase
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*/
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uip->uip_arpstate = UIAS_CLIENT_REGISTER;
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/*
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* To register ourselves, RFC1577 says we should wait
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* around for the server to send us an InATMARP_Request.
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* However, draft-1577+ just has us send an ATMARP_Request
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* for our own address. To keep everyone happy, we'll go
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* with both and see what works!
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*/
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(void) uniarp_arp_req(uip, &(IA_SIN(inp->inf_addr)->sin_addr));
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/*
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* Start retry timer
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*/
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UNIIP_ARP_TIMER(uip, 1 * ATM_HZ);
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(void) splx(s);
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return (0);
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}
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/*
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* Send an InATMARP_Request on this VCC to find out/notify who's at
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* the other end. If we're the server, this will start off the
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* RFC1577 registration procedure. If we're a client, then this
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* SVC is for user data and it's pretty likely that both ends are
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* going to be sending packets. So, if we're the caller, we'll be
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* nice and let the callee know right away who we are. If we're the
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* callee, let's find out asap the caller's IP address.
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*/
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(void) uniarp_inarp_req(uip, &uap->ua_dstatm, &uap->ua_dstatmsub, ivp);
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/*
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* Start retry timer if entry isn't valid yet
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*/
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if (((uap->ua_flags & UAF_VALID) == 0) &&
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((uap->ua_time.ti_flag & TIF_QUEUED) == 0))
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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
|
|
*/
|
|
atm_free((caddr_t)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)
|
|
atm_free((caddr_t)ivp);
|
|
|
|
(void) splx(s);
|
|
}
|
|
|