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freebsd-dev/sys/netatm/spans/spans_arp.c
Brooks Davis 9bf40ede4a Replace the if_name and if_unit members of struct ifnet with new members 
if_xname, if_dname, and if_dunit. if_xname is the name of the interface
and if_dname/unit are the driver name and instance.

This change paves the way for interface renaming and enhanced pseudo
device creation and configuration symantics.

Approved By:	re (in principle)
Reviewed By:	njl, imp
Tested On:	i386, amd64, sparc64
Obtained From:	NetBSD (if_xname)
2003-10-31 18:32:15 +00:00

1168 lines
24 KiB
C
Raw Blame History

/*
* ===================================
* 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.
*/
/*
* SPANS Signalling Manager
* ---------------------------
*
* SPANS CLS - ARP support
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/errno.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 <netinet/in_var.h>
#include <netinet/if_ether.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_vc.h>
#include <netatm/atm_ioctl.h>
#include <netatm/atm_sigmgr.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 "spans_xdr.h"
#include <netatm/spans/spans_var.h>
#include <netatm/spans/spans_cls.h>
#include <vm/uma.h>
/*
* Global variables
*/
struct spansarp *spansarp_arptab[SPANSARP_HASHSIZ] = {NULL};
/*
* Local functions
*/
static int spansarp_request(struct spansarp *);
static void spansarp_aging(struct atm_time *);
static void spansarp_retry(struct atm_time *);
/*
* Local variables
*/
static struct atm_time spansarp_timer = {0, 0}; /* Aging timer */
static struct atm_time spansarp_rtimer = {0, 0}; /* Retry timer */
static struct spansarp *spansarp_retry_head = NULL; /* Retry chain */
static uma_zone_t spansarp_zone;
/*
* Process a new outgoing SVC requiring SPANS ARP support
*
* This function is called by an endpoint wishing 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
spansarp_svcout(ivp, dst)
struct ipvcc *ivp;
struct in_addr *dst;
{
struct spanscls *clp;
struct spansarp *sap;
int s;
ivp->iv_arpent = NULL;
/*
* Lookup destination address
*/
s = splnet();
SPANSARP_LOOKUP(dst->s_addr, sap);
if (sap) {
/*
* Link this vcc to entry queue
*/
LINK2TAIL(ivp, struct ipvcc, sap->sa_ivp, iv_arpnext);
/*
* If entry is valid, we're done
*/
if (sap->sa_flags & SAF_VALID) {
ivp->iv_arpent = (struct arpmap *)sap;
(void) splx(s);
return (MAP_VALID);
}
/*
* We're already looking for this address
*/
(void) splx(s);
return (MAP_PROCEEDING);
}
/*
* Need a new arp entry - first, find the cls instance
* corresponding to the requestor's IP interface.
*/
for (clp = spanscls_head; clp; clp = clp->cls_next) {
if (clp->cls_ipnif == ivp->iv_ipnif)
break;
}
if (clp == NULL) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Now get the new arp entry
*/
sap = uma_zalloc(spansarp_zone, M_WAITOK);
if (sap == NULL) {
(void) splx(s);
return (MAP_FAILED);
}
/*
* Get entry set up
*/
sap->sa_dstip.s_addr = dst->s_addr;
sap->sa_dstatm.address_format = T_ATM_ABSENT;
sap->sa_dstatm.address_length = 0;
sap->sa_dstatmsub.address_format = T_ATM_ABSENT;
sap->sa_dstatmsub.address_length = 0;
sap->sa_cls = clp;
sap->sa_origin = SAO_LOOKUP;
/*
* Link ipvcc to arp entry for later notification
*/
LINK2TAIL(ivp, struct ipvcc, sap->sa_ivp, iv_arpnext);
/*
* Add arp entry to table
*/
SPANSARP_ADD(sap);
/*
* Add arp entry to retry list and start retry timer if needed
*/
LINK2TAIL(sap, struct spansarp, spansarp_retry_head, sa_rnext);
if ((spansarp_rtimer.ti_flag & TIF_QUEUED) == 0)
atm_timeout(&spansarp_rtimer, SPANSARP_RETRY, spansarp_retry);
/*
* Issue arp request for this address
*/
(void) spansarp_request(sap);
(void) splx(s);
return (MAP_PROCEEDING);
}
/*
* Process a new incoming SVC requiring SPANS ARP support
*
* This function is called by an endpoint wishing to resolve a destination
* ATM address to its IP address for an incoming call in order to allow a
* bi-directional flow of IP packets on the SVC.
*
* SPANS ARP does not provide reverse mapping facilities and only supports
* uni-directional SVCs. Thus, we lie a little to IP and always return a
* MAP_PROCEEDING indication, but we will never later notify IP of a
* MAP_VALID condition.
*
* Arguments:
* ivp pointer to SVC's IPVCC control block
* dst pointer to destination ATM address
* dstsub pointer to destination 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
spansarp_svcin(ivp, dst, dstsub)
struct ipvcc *ivp;
Atm_addr *dst;
Atm_addr *dstsub;
{
/*
* Clear ARP entry field
*/
ivp->iv_arpent = NULL;
return (MAP_PROCEEDING);
}
/*
* SPANS ARP SVC activation notification
*
* This function is called when 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
spansarp_svcactive(ivp)
struct ipvcc *ivp;
{
struct spansarp *sap;
int s = splnet();
/*
* Find an entry for the destination address
*/
SPANSARP_LOOKUP(ivp->iv_dst.s_addr, sap);
if (sap) {
/*
* IP is finished with entry, so remove IP VCC from chain
*/
UNLINK(ivp, struct ipvcc, sap->sa_ivp, iv_arpnext);
ivp->iv_arpent = NULL;
/*
* This seems like a reasonable reason to refresh the entry
*/
sap->sa_reftime = 0;
}
(void) splx(s);
return (0);
}
/*
* SPANS ARP supported VCC is closing
*
* This function is called just prior to a user closing a VCC which
* supports SPANS ARP. 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
spansarp_vcclose(ivp)
struct ipvcc *ivp;
{
struct spansarp *sap;
int s = splnet();
/*
* Get spansarp entry
*/
SPANSARP_LOOKUP(ivp->iv_dst.s_addr, sap);
if (sap == NULL) {
(void) splx(s);
return;
}
/*
* Remove IP VCC from chain
*/
UNLINK(ivp, struct ipvcc, sap->sa_ivp, iv_arpnext);
ivp->iv_arpent = NULL;
/*
* If entry is currently valid or in use, not much else for us to do
*/
if ((sap->sa_flags & (SAF_VALID | SAF_LOCKED)) ||
(sap->sa_origin >= SAO_PERM)) {
(void) splx(s);
return;
}
/*
* If there are still other VCCs waiting, exit
*/
if (sap->sa_ivp) {
(void) splx(s);
return;
}
/*
* Noone else waiting, so remove entry from the retry chain
*/
UNLINK(sap, struct spansarp, spansarp_retry_head, sa_rnext);
/*
* Free entry
*/
SPANSARP_DELETE(sap);
uma_zfree(spansarp_zone, sap);
(void) splx(s);
}
/*
* Called when the spans module is loaded.
*/
void
spansarp_start()
{
spansarp_zone = uma_zcreate("spansarp", sizeof(struct spansarp),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
if (spansarp_zone == NULL)
panic("spansarp_zone");
}
/*
* Process module unloading notification
*
* Called whenever the spans module is about to be unloaded. All signalling
* instances will have been previously detached. All spansarp resources
* must be freed now.
*
* Arguments:
* none
*
* Returns:
* none
*
*/
void
spansarp_stop()
{
int i;
/*
* Make sure the arp table is empty
*/
for (i = 0; i < SPANSARP_HASHSIZ; i++) {
if (spansarp_arptab[i] != NULL)
panic("spansarp_stop: arp table not empty");
}
/*
* Cancel timers
*/
(void) atm_untimeout(&spansarp_timer);
(void) atm_untimeout(&spansarp_rtimer);
/*
* Free our storage pools
*/
uma_zdestroy(spansarp_zone);
}
/*
* Process IP Network Interface Activation
*
* Called whenever an IP network interface becomes active.
*
* Called at splnet.
*
* Arguments:
* clp pointer to CLS interface
*
* Returns:
* none
*
*/
void
spansarp_ipact(clp)
struct spanscls *clp;
{
/*
* Make sure aging timer is running
*/
if ((spansarp_timer.ti_flag & TIF_QUEUED) == 0)
atm_timeout(&spansarp_timer, SPANSARP_AGING, spansarp_aging);
}
/*
* Process IP Network Interface Deactivation
*
* Called whenever an IP network interface becomes inactive.
*
* Called at splnet.
*
* Arguments:
* clp pointer to CLS interface
*
* Returns:
* none
*
*/
void
spansarp_ipdact(clp)
struct spanscls *clp;
{
struct spanscls *clp2;
struct spansarp *sap, *snext;
int i;
/*
* Delete all interface entries
*/
for (i = 0; i < SPANSARP_HASHSIZ; i++) {
for (sap = spansarp_arptab[i]; sap; sap = snext) {
snext = sap->sa_next;
/*
* Clean up entries for this interface
*/
if (sap->sa_cls != clp)
continue;
/*
* All VCCs better be gone by now
*/
if (sap->sa_ivp)
panic("spansarp_ipdact: entry not empty");
/*
* Remove entry from the retry chain
*/
UNLINK(sap, struct spansarp,
spansarp_retry_head, sa_rnext);
/*
* Delete entry from arp table
*/
SPANSARP_DELETE(sap);
uma_zfree(spansarp_zone, sap);
}
}
/*
* Stop aging timer if this is the last active interface
*/
for (clp2 = spanscls_head; clp2; clp2 = clp2->cls_next) {
if ((clp != clp2) && (clp2->cls_ipnif))
break;
}
if (clp2 == NULL)
(void) atm_untimeout(&spansarp_timer);
}
/*
* Issue a SPANS ARP request packet
*
* Arguments:
* sap pointer to arp table entry
*
* Returns:
* 0 packet was successfully sent
* else unable to send packet
*
*/
static int
spansarp_request(sap)
struct spansarp *sap;
{
struct spanscls *clp;
struct spans *spp;
struct spanscls_hdr *chp;
struct spansarp_hdr *ahp;
KBuffer *m;
struct ip_nif *inp;
int err;
clp = sap->sa_cls;
spp = clp->cls_spans;
inp = clp->cls_ipnif;
/*
* Make sure CLS VCC is open and that we know our addresses
*/
if (clp->cls_state != CLS_OPEN)
return (1);
if (spp->sp_addr.address_format != T_ATM_SPANS_ADDR)
return (1);
if (inp == NULL)
return (1);
/*
* Get a buffer for pdu
*/
KB_ALLOCPKT(m, ARP_PACKET_LEN, KB_F_NOWAIT, KB_T_DATA);
if (m == NULL)
return (1);
/*
* Place pdu at end of buffer
*/
KB_PLENSET(m, ARP_PACKET_LEN);
KB_TAILALIGN(m, ARP_PACKET_LEN);
KB_DATASTART(m, chp, struct spanscls_hdr *);
ahp = (struct spansarp_hdr *)(chp + 1);
/*
* Build headers
*/
spans_addr_copy(&spans_bcastaddr, &chp->ch_dst);
spans_addr_copy(spp->sp_addr.address, &chp->ch_src);
*(u_int *)&chp->ch_proto = *(u_int *)&spanscls_hdr.ch_proto;
*(u_int *)&chp->ch_dsap = *(u_int *)&spanscls_hdr.ch_dsap;
*(u_short *)&chp->ch_oui[1] = *(u_short *)&spanscls_hdr.ch_oui[1];
chp->ch_pid = htons(ETHERTYPE_ARP);
/*
* Build ARP packet
*/
ahp->ah_hrd = htons(ARP_SPANS);
ahp->ah_pro = htons(ETHERTYPE_IP);
ahp->ah_hln = sizeof(spans_addr);
ahp->ah_pln = sizeof(struct in_addr);
ahp->ah_op = htons(ARP_REQUEST);
spans_addr_copy(spp->sp_addr.address, &ahp->ah_sha);
bcopy(&(IA_SIN(inp->inf_addr)->sin_addr), ahp->ah_spa,
sizeof(struct in_addr));
bcopy(&sap->sa_dstip, ahp->ah_tpa, sizeof(struct in_addr));
/*
* Now, send the pdu via the CLS service
*/
err = atm_cm_cpcs_data(clp->cls_conn, m);
if (err) {
KB_FREEALL(m);
return (1);
}
return (0);
}
/*
* Process a SPANS ARP input packet
*
* Arguments:
* clp pointer to interface CLS control block
* m pointer to input packet buffer chain
*
* Returns:
* none
*
*/
void
spansarp_input(clp, m)
struct spanscls *clp;
KBuffer *m;
{
struct spans *spp = clp->cls_spans;
struct spanscls_hdr *chp;
struct spansarp_hdr *ahp;
struct spansarp *sap;
struct ip_nif *inp = clp->cls_ipnif;
struct in_addr in_me, in_src, in_targ;
int s, err;
/*
* Make sure IP interface has been activated
*/
if (inp == NULL)
goto free;
/*
* Get the packet together
*/
if (KB_LEN(m) < ARP_PACKET_LEN) {
KB_PULLUP(m, ARP_PACKET_LEN, m);
if (m == 0)
return;
}
KB_DATASTART(m, chp, struct spanscls_hdr *);
ahp = (struct spansarp_hdr *)(chp + 1);
bcopy(ahp->ah_spa, &in_src, sizeof(struct in_addr));
bcopy(ahp->ah_tpa, &in_targ, sizeof(struct in_addr));
bcopy(&(IA_SIN(inp->inf_addr)->sin_addr), &in_me,
sizeof(struct in_addr));
/*
* Initial packet verification
*/
if ((ahp->ah_hrd != htons(ARP_SPANS)) ||
(ahp->ah_pro != htons(ETHERTYPE_IP)))
goto free;
/*
* Validate source addresses
* can't be from hardware broadcast
* can't be from me
*/
if (!spans_addr_cmp(&ahp->ah_sha, &spans_bcastaddr))
goto free;
if (!spans_addr_cmp(&ahp->ah_sha, spp->sp_addr.address))
goto free;
if (in_src.s_addr == in_me.s_addr) {
log(LOG_ERR,
"duplicate IP address sent from spans address %s\n",
spans_addr_print(&ahp->ah_sha));
in_targ = in_me;
goto chkop;
}
/*
* If source IP address is from unspecified or broadcast addresses,
* don't bother updating arp table, but answer possible requests
*/
if (in_broadcast(in_src, &inp->inf_nif->nif_if))
goto chkop;
/*
* Update arp table with source address info
*/
s = splnet();
SPANSARP_LOOKUP(in_src.s_addr, sap);
if (sap) {
/*
* Found an entry for the source, but don't
* update permanent entries
*/
if (sap->sa_origin != SAO_PERM) {
/*
* Update the entry
*/
sap->sa_dstatm.address_format = T_ATM_SPANS_ADDR;
sap->sa_dstatm.address_length = sizeof(spans_addr);
spans_addr_copy(&ahp->ah_sha, sap->sa_dstatm.address);
sap->sa_cls = clp;
sap->sa_reftime = 0;
if ((sap->sa_flags & SAF_VALID) == 0) {
/*
* Newly valid entry, notify waiting users
*/
struct ipvcc *ivp, *inext;
sap->sa_flags |= SAF_VALID;
for (ivp = sap->sa_ivp; ivp; ivp = inext) {
inext = ivp->iv_arpnext;
ivp->iv_arpent = (struct arpmap *)sap;
(*inp->inf_arpnotify)(ivp, MAP_VALID);
}
/*
* Remove ourselves from the retry chain
*/
UNLINK(sap, struct spansarp,
spansarp_retry_head, sa_rnext);
}
}
} else if (in_targ.s_addr == in_me.s_addr) {
/*
* Source unknown and we're the target - add new entry
*/
sap = uma_zalloc(spansarp_zone, M_WAITOK);
if (sap) {
sap->sa_dstip.s_addr = in_src.s_addr;
sap->sa_dstatm.address_format = T_ATM_SPANS_ADDR;
sap->sa_dstatm.address_length = sizeof(spans_addr);
spans_addr_copy(&ahp->ah_sha, sap->sa_dstatm.address);
sap->sa_dstatmsub.address_format = T_ATM_ABSENT;
sap->sa_dstatmsub.address_length = 0;
sap->sa_cls = clp;
sap->sa_flags = SAF_VALID;
sap->sa_origin = SAO_LOOKUP;
SPANSARP_ADD(sap);
}
}
(void) splx(s);
chkop:
/*
* If this is a request for our address, send a reply
*/
if (ntohs(ahp->ah_op) != ARP_REQUEST)
goto free;
if (in_targ.s_addr != in_me.s_addr)
goto free;
spans_addr_copy(&chp->ch_src, &chp->ch_dst);
spans_addr_copy(spp->sp_addr.address, &chp->ch_src);
ahp->ah_op = htons(ARP_REPLY);
spans_addr_copy(&ahp->ah_sha, &ahp->ah_tha);
spans_addr_copy(spp->sp_addr.address, &ahp->ah_sha);
bcopy(ahp->ah_spa, ahp->ah_tpa, sizeof(struct in_addr));
bcopy(&in_me, ahp->ah_spa, sizeof(struct in_addr));
err = atm_cm_cpcs_data(clp->cls_conn, m);
if (err)
goto free;
return;
free:
KB_FREEALL(m);
}
/*
* Process a SPANS ARP aging timer tick
*
* This function is called every SPANSARP_AGING seconds, in order to age
* all the arp table entries.
*
* Called at splnet.
*
* Arguments:
* tip pointer to spansarp aging timer control block
*
* Returns:
* none
*
*/
static void
spansarp_aging(tip)
struct atm_time *tip;
{
struct spansarp *sap, *snext;
struct ipvcc *ivp, *inext;
int i;
/*
* Schedule next timeout
*/
atm_timeout(&spansarp_timer, SPANSARP_AGING, spansarp_aging);
/*
* Run through arp table bumping each entry's aging timer.
*/
for (i = 0; i < SPANSARP_HASHSIZ; i++) {
for (sap = spansarp_arptab[i]; sap; sap = snext) {
snext = sap->sa_next;
/*
* Permanent (manually installed) entries aren't aged
*/
if (sap->sa_origin == SAO_PERM)
continue;
/*
* See if entry is valid and over-aged
*/
if ((sap->sa_flags & SAF_VALID) == 0)
continue;
if (++sap->sa_reftime < SPANSARP_MAXAGE)
continue;
/*
* Entry is now invalid, tell IP/ATM about it
*/
sap->sa_flags |= SAF_LOCKED;
for (ivp = sap->sa_ivp; ivp; ivp = inext) {
inext = ivp->iv_arpnext;
(*ivp->iv_ipnif->inf_arpnotify)
(ivp, MAP_INVALID);
}
sap->sa_flags &= ~(SAF_LOCKED | SAF_VALID);
if (sap->sa_ivp != NULL) {
/*
* Somebody still cares, so add the arp
* entry to the retry list.
*/
LINK2TAIL(sap, struct spansarp,
spansarp_retry_head, sa_rnext);
if ((spansarp_rtimer.ti_flag & TIF_QUEUED) == 0)
atm_timeout(&spansarp_rtimer,
SPANSARP_RETRY, spansarp_retry);
/*
* Issue arp request for this address
*/
(void) spansarp_request(sap);
} else {
/*
* Delete unused entry
*/
SPANSARP_DELETE(sap);
uma_zfree(spansarp_zone, sap);
}
}
}
}
/*
* Process a SPANS ARP retry timer tick
*
* This function is called every SPANSARP_RETRY seconds, in order to retry
* awaiting arp resolution requests. We will retry requests indefinitely,
* assuming that IP will set a timeout to close the VCC(s) requesting the
* failing address resolution.
*
* Called at splnet.
*
* Arguments:
* tip pointer to spansarp retry timer control block
*
* Returns:
* none
*
*/
static void
spansarp_retry(tip)
struct atm_time *tip;
{
struct spansarp *sap;
/*
* See if there's work to do
*/
if (spansarp_retry_head == NULL) {
return;
}
/*
* Schedule next timeout
*/
atm_timeout(&spansarp_rtimer, SPANSARP_RETRY, spansarp_retry);
/*
* Run through retry chain, (re)issuing arp requests.
*/
for (sap = spansarp_retry_head; sap; sap = sap->sa_next) {
/*
* Send another arp request
*/
(void) spansarp_request(sap);
}
}
/*
* SPANS ARP IOCTL support
*
* Function will be called at splnet.
*
* Arguments:
* code PF_ATM sub-operation code
* data pointer to code specific parameter data area
* arg1 pointer to code specific argument
*
* Returns:
* 0 request procesed
* errno error processing request - reason indicated
*
*/
int
spansarp_ioctl(code, data, arg1)
int code;
caddr_t data;
caddr_t arg1;
{
struct atmaddreq *aap;
struct atmdelreq *adp;
struct atminfreq *aip;
struct spans *spp;
struct spanscls *clp;
struct spansarp *sap;
struct air_arp_rsp aar;
struct ip_nif *inp;
struct ipvcc *ivp, *inext;
struct in_addr ip;
u_long dst;
int err = 0, i;
size_t buf_len;
caddr_t buf_addr;
switch (code) {
case AIOCS_ADD_ARP:
/*
* Add a permanent ARP mapping
*/
aap = (struct atmaddreq *)data;
clp = (struct spanscls *)arg1;
inp = clp->cls_ipnif;
if ((aap->aar_arp_addr.address_format != T_ATM_SPANS_ADDR) ||
(aap->aar_arp_origin != ARP_ORIG_PERM)) {
err = EINVAL;
break;
}
ip = SATOSIN(&aap->aar_arp_dst)->sin_addr;
/*
* See if we already have an entry for this IP address
*/
SPANSARP_LOOKUP(ip.s_addr, sap);
if (sap == NULL) {
/*
* No, get a new arp entry
*/
sap = uma_zalloc(spansarp_zone, M_WAITOK);
if (sap == NULL) {
err = ENOMEM;
break;
}
/*
* Get entry set up
*/
sap->sa_dstip = ip;
ATM_ADDR_COPY(&aap->aar_arp_addr, &sap->sa_dstatm);
sap->sa_dstatmsub.address_format = T_ATM_ABSENT;
sap->sa_dstatmsub.address_length = 0;
sap->sa_cls = clp;
sap->sa_flags |= SAF_VALID;
sap->sa_origin = SAO_PERM;
/*
* Add entry to table
*/
SPANSARP_ADD(sap);
break;
}
/*
* See if we're attempting to change the ATM address for
* this cached entry
*/
if ((sap->sa_dstatm.address_format != T_ATM_ABSENT) &&
(!ATM_ADDR_EQUAL(&aap->aar_arp_addr, &sap->sa_dstatm) ||
(clp != sap->sa_cls))) {
/*
* Yes, notify IP/ATM that a mapping change has
* occurred. IP/ATM will close any VCC's which
* aren't waiting for this map.
*/
sap->sa_flags |= SAF_LOCKED;
for (ivp = sap->sa_ivp; ivp; ivp = inext) {
inext = ivp->iv_arpnext;
(*inp->inf_arpnotify)(ivp, MAP_CHANGED);
}
sap->sa_flags &= ~SAF_LOCKED;
}
/*
* Update the cached entry with the new data
*/
ATM_ADDR_COPY(&aap->aar_arp_addr, &sap->sa_dstatm);
sap->sa_cls = clp;
/*
* If this entry isn't valid, notify anyone who might
* be interested
*/
if ((sap->sa_flags & SAF_VALID) == 0) {
sap->sa_flags |= SAF_LOCKED;
for (ivp = sap->sa_ivp; ivp; ivp = inext) {
inext = ivp->iv_arpnext;
(*inp->inf_arpnotify)(ivp, MAP_VALID);
}
sap->sa_flags &= ~SAF_LOCKED;
}
/*
* Remove this entry from the retry chain
*/
UNLINK(sap, struct spansarp, spansarp_retry_head, sa_rnext);
/*
* Mark the entry as permanent
*/
sap->sa_flags |= SAF_VALID;
sap->sa_origin = SAO_PERM;
break;
case AIOCS_DEL_ARP:
/*
* Delete an ARP mapping
*/
adp = (struct atmdelreq *)data;
clp = (struct spanscls *)arg1;
ip = SATOSIN(&adp->adr_arp_dst)->sin_addr;
/*
* Now find the entry to be deleted
*/
SPANSARP_LOOKUP(ip.s_addr, sap);
if (sap == NULL) {
err = ENOENT;
break;
}
/*
* Notify all VCCs using this entry that they must finish
* up now.
*/
sap->sa_flags |= SAF_LOCKED;
for (ivp = sap->sa_ivp; ivp; ivp = inext) {
inext = ivp->iv_arpnext;
(*ivp->iv_ipnif->inf_arpnotify)(ivp, MAP_FAILED);
}
/*
* Now free up the entry
*/
UNLINK(sap, struct spansarp, spansarp_retry_head, sa_rnext);
SPANSARP_DELETE(sap);
uma_zfree(spansarp_zone, sap);
break;
case AIOCS_INF_ARP:
/*
* Get ARP table information
*/
aip = (struct atminfreq *)data;
spp = (struct spans *)arg1;
if (aip->air_arp_addr.sa_family != AF_INET)
break;
dst = SATOSIN(&aip->air_arp_addr)->sin_addr.s_addr;
buf_addr = aip->air_buf_addr;
buf_len = aip->air_buf_len;
if ((clp = spp->sp_cls) == NULL)
break;
/*
* Run through entire arp table
*/
for (i = 0; i < SPANSARP_HASHSIZ; i++) {
for (sap = spansarp_arptab[i]; sap;
sap = sap->sa_next) {
/*
* We only want entries learned
* from the supplied interface.
*/
if (sap->sa_cls != clp)
continue;
if ((dst != INADDR_ANY) &&
(dst != sap->sa_dstip.s_addr))
continue;
/*
* Make sure there's room in the user's buffer
*/
if (buf_len < sizeof(aar)) {
err = ENOSPC;
break;
}
/*
* Fill in info to be returned
*/
SATOSIN(&aar.aap_arp_addr)->sin_family =
AF_INET;
SATOSIN(&aar.aap_arp_addr)->sin_addr.s_addr =
sap->sa_dstip.s_addr;
strlcpy(aar.aap_intf,
clp->cls_ipnif->inf_nif->nif_if.if_xname,
sizeof(aar.aap_intf));
aar.aap_flags = sap->sa_flags;
aar.aap_origin = sap->sa_origin;
if (sap->sa_flags & SAF_VALID)
aar.aap_age = SPANSARP_MAXAGE -
sap->sa_reftime;
else
aar.aap_age = 0;
ATM_ADDR_COPY(&sap->sa_dstatm, &aar.aap_addr);
ATM_ADDR_COPY(&sap->sa_dstatmsub,
&aar.aap_subaddr);
/*
* Copy the response into the user's buffer
*/
if ((err = copyout((caddr_t)&aar, buf_addr,
sizeof(aar))) != 0)
break;
buf_addr += sizeof(aar);
buf_len -= sizeof(aar);
}
if (err)
break;
}
/*
* Update the buffer pointer and length
*/
aip->air_buf_addr = buf_addr;
aip->air_buf_len = buf_len;
break;
case AIOCS_INF_ASV:
/*
* Get ARP server information
*/
/* SPANS doesn't have an ARP server */
break;
default:
err = EOPNOTSUPP;
}
return (err);
}
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