876 lines
19 KiB
C
876 lines
19 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) - Input packet processing
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*
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/if_ether.h>
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#include <netatm/port.h>
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#include <netatm/queue.h>
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#include <netatm/atm.h>
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#include <netatm/atm_sys.h>
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#include <netatm/atm_sap.h>
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#include <netatm/atm_cm.h>
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#include <netatm/atm_if.h>
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#include <netatm/atm_vc.h>
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#include <netatm/atm_ioctl.h>
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#include <netatm/atm_sigmgr.h>
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#include <netatm/atm_stack.h>
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#include <netatm/atm_pcb.h>
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#include <netatm/atm_var.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 functions
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*/
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static void proc_arp_req __P((struct ipvcc *, KBuffer *));
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static void proc_arp_rsp __P((struct ipvcc *, KBuffer *));
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static void proc_arp_nak __P((struct ipvcc *, KBuffer *));
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static void proc_inarp_req __P((struct ipvcc *, KBuffer *));
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static void proc_inarp_rsp __P((struct ipvcc *, KBuffer *));
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/*
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* Local variables
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*/
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static Atm_addr satm;
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static Atm_addr satmsub;
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static Atm_addr tatm;
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static Atm_addr tatmsub;
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static struct in_addr sip;
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static struct in_addr tip;
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/*
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* Process ATMARP Input Data
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*
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* Arguments:
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* tok uniarp connection token (pointer to ipvcc)
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* m pointer to input packet buffer chain
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*
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* Returns:
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* none
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*
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*/
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void
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uniarp_cpcs_data(tok, m)
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void *tok;
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KBuffer *m;
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{
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struct ipvcc *ivp = tok;
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struct atmarp_hdr *ahp;
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KBuffer *n;
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int len, plen = sizeof(struct atmarp_hdr);
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#ifdef DIAGNOSTIC
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if (uniarp_print)
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uniarp_pdu_print(ivp, m, "receive");
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#endif
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/*
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* Verify IP's VCC state
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*/
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if (ivp->iv_state != IPVCC_ACTIVE) {
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goto bad;
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}
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/*
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* Get the fixed fields together
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*/
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if (KB_LEN(m) < sizeof(struct atmarp_hdr)) {
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KB_PULLUP(m, sizeof(struct atmarp_hdr), m);
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if (m == NULL)
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goto bad;
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}
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KB_DATASTART(m, ahp, struct atmarp_hdr *);
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/*
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* Initial packet verification
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*/
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if ((ahp->ah_hrd != htons(ARP_ATMFORUM)) ||
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(ahp->ah_pro != htons(ETHERTYPE_IP)))
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goto bad;
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/*
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* Verify/gather source address fields
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*/
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if ((len = (ahp->ah_shtl & ARP_TL_LMASK)) != 0) {
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if (ahp->ah_shtl & ARP_TL_E164) {
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if (len > sizeof(struct atm_addr_e164))
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goto bad;
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satm.address_format = T_ATM_E164_ADDR;
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} else {
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if (len != sizeof(struct atm_addr_nsap))
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goto bad;
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satm.address_format = T_ATM_ENDSYS_ADDR;
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}
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satm.address_length = len;
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if (KB_COPYDATA(m, plen, len, (caddr_t)satm.address))
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goto bad;
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plen += len;
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} else {
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satm.address_format = T_ATM_ABSENT;
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satm.address_length = 0;
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}
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if ((len = (ahp->ah_sstl & ARP_TL_LMASK)) != 0) {
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if (((ahp->ah_sstl & ARP_TL_TMASK) != ARP_TL_NSAPA) ||
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(len != sizeof(struct atm_addr_nsap)))
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goto bad;
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satmsub.address_format = T_ATM_ENDSYS_ADDR;
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satmsub.address_length = len;
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if (KB_COPYDATA(m, plen, len, (caddr_t)satmsub.address))
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goto bad;
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plen += len;
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} else {
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satmsub.address_format = T_ATM_ABSENT;
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satmsub.address_length = 0;
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}
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if ((len = ahp->ah_spln) != 0) {
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if (len != sizeof(struct in_addr))
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goto bad;
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if (KB_COPYDATA(m, plen, len, (caddr_t)&sip))
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goto bad;
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plen += len;
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} else {
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sip.s_addr = 0;
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}
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/*
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* Verify/gather target address fields
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*/
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if ((len = (ahp->ah_thtl & ARP_TL_LMASK)) != 0) {
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if (ahp->ah_thtl & ARP_TL_E164) {
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if (len > sizeof(struct atm_addr_e164))
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goto bad;
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tatm.address_format = T_ATM_E164_ADDR;
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} else {
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if (len != sizeof(struct atm_addr_nsap))
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goto bad;
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tatm.address_format = T_ATM_ENDSYS_ADDR;
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}
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tatm.address_length = len;
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if (KB_COPYDATA(m, plen, len, (caddr_t)tatm.address))
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goto bad;
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plen += len;
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} else {
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tatm.address_format = T_ATM_ABSENT;
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tatm.address_length = 0;
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}
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if ((len = (ahp->ah_tstl & ARP_TL_LMASK)) != 0) {
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if (((ahp->ah_tstl & ARP_TL_TMASK) != ARP_TL_NSAPA) ||
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(len != sizeof(struct atm_addr_nsap)))
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goto bad;
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tatmsub.address_format = T_ATM_ENDSYS_ADDR;
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tatmsub.address_length = len;
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if (KB_COPYDATA(m, plen, len, (caddr_t)tatmsub.address))
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goto bad;
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plen += len;
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} else {
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tatmsub.address_format = T_ATM_ABSENT;
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tatmsub.address_length = 0;
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}
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if ((len = ahp->ah_tpln) != 0) {
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if (len != sizeof(struct in_addr))
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goto bad;
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if (KB_COPYDATA(m, plen, len, (caddr_t)&tip))
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goto bad;
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plen += len;
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} else {
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tip.s_addr = 0;
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}
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/*
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* Verify packet length
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*/
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for (len = 0, n = m; n; n = KB_NEXT(n))
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len += KB_LEN(n);
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if (len != plen)
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goto bad;
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/*
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* Now finish with packet-specific processing
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*/
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switch (ntohs(ahp->ah_op)) {
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case ARP_REQUEST:
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proc_arp_req(ivp, m);
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break;
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case ARP_REPLY:
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proc_arp_rsp(ivp, m);
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break;
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case INARP_REQUEST:
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proc_inarp_req(ivp, m);
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break;
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case INARP_REPLY:
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proc_inarp_rsp(ivp, m);
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break;
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case ARP_NAK:
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proc_arp_nak(ivp, m);
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break;
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default:
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goto bad;
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}
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return;
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bad:
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uniarp_stat.uas_rcvdrop++;
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if (m)
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KB_FREEALL(m);
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}
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/*
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* Process an ATMARP request packet
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*
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* Arguments:
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* ivp pointer to input VCC's IPVCC control block
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* m pointer to input packet buffer chain
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*
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* Returns:
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* none
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*
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*/
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static void
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proc_arp_req(ivp, m)
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struct ipvcc *ivp;
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KBuffer *m;
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{
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struct ip_nif *inp;
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struct atm_nif *nip;
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struct siginst *sgp;
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struct uniip *uip;
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struct uniarp *uap;
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struct in_addr myip;
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int s = splnet();
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/*
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* Only an arp server should receive these
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*/
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inp = ivp->iv_ipnif;
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nip = inp->inf_nif;
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uip = (struct uniip *)inp->inf_isintf;
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if ((uip == NULL) ||
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(uip->uip_arpstate != UIAS_SERVER_ACTIVE))
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goto drop;
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/*
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* These should be sent only on SVCs
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*/
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if ((ivp->iv_flags & IVF_SVC) == 0)
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goto drop;
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/*
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* Locate our addresses
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*/
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sgp = nip->nif_pif->pif_siginst;
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myip.s_addr = IA_SIN(inp->inf_addr)->sin_addr.s_addr;
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/*
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* Target IP address must be present
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*/
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if (tip.s_addr == 0)
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goto drop;
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/*
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* Drop packet if both Source addresses aren't present
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*/
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if ((sip.s_addr == 0) || (satm.address_format == T_ATM_ABSENT))
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goto drop;
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/*
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* Source addresses can't be ours
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*/
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if (ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &satm) &&
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ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel, &satmsub)) {
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struct vccb *vcp = ivp->iv_conn->co_connvc->cvc_vcc;
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log(LOG_WARNING,
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"uniarp: vcc=(%d,%d) reports our ATM address\n",
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vcp->vc_vpi, vcp->vc_vci);
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goto drop;
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}
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if (sip.s_addr == myip.s_addr) {
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struct vccb *vcp = ivp->iv_conn->co_connvc->cvc_vcc;
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log(LOG_WARNING,
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"uniarp: vcc=(%d,%d) reports our IP address\n",
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vcp->vc_vpi, vcp->vc_vci);
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goto drop;
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}
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/*
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* Validate Source IP address
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*/
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if (uniarp_validate_ip(uip, &sip, UAO_REGISTER) != 0)
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goto drop;
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/*
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* If the source and target IP addresses are the same, then this
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* must be a client registration request (RFC-2225). Otherwise,
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* try to accomodate old clients (per RFC-2225 8.4.4).
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*/
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if (sip.s_addr == tip.s_addr)
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(void) uniarp_cache_svc(uip, &sip, &satm, &satmsub,
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UAO_REGISTER);
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else {
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uap = (struct uniarp *)ivp->iv_arpent;
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if ((uap == NULL) || (uap->ua_origin < UAO_REGISTER))
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(void) uniarp_cache_svc(uip, &sip, &satm, &satmsub,
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UAO_REGISTER);
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}
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/*
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* Lookup the target IP address in the cache (and also check if
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* the query is for our address).
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*/
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UNIARP_LOOKUP(tip.s_addr, uap);
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if (uap && (uap->ua_flags & UAF_VALID)) {
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/*
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* We've found a valid mapping
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*/
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(void) uniarp_arp_rsp(uip, &uap->ua_arpmap, &sip, &satm,
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&satmsub, ivp);
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} else if (tip.s_addr == myip.s_addr) {
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/*
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* We're the target, so respond accordingly
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*/
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(void) uniarp_arp_rsp(uip, &uip->uip_arpsvrmap, &sip, &satm,
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&satmsub, ivp);
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} else {
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/*
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* We don't know who the target is, so NAK the query
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*/
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(void) uniarp_arp_nak(uip, m, ivp);
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m = NULL;
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}
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drop:
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(void) splx(s);
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if (m)
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KB_FREEALL(m);
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return;
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}
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/*
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* Process an ATMARP reply packet
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*
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* Arguments:
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* ivp pointer to input VCC's IPVCC control block
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* m pointer to input packet buffer chain
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*
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* Returns:
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* none
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*
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*/
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static void
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proc_arp_rsp(ivp, m)
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struct ipvcc *ivp;
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KBuffer *m;
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{
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struct ip_nif *inp;
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struct atm_nif *nip;
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struct siginst *sgp;
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struct uniip *uip;
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struct uniarp *uap;
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struct in_addr myip;
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int s = splnet();
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/*
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* Only the arp server should send these
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*/
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inp = ivp->iv_ipnif;
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nip = inp->inf_nif;
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uip = (struct uniip *)inp->inf_isintf;
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if ((uip == NULL) ||
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(uip->uip_arpsvrvcc != ivp))
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goto drop;
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/*
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* Locate our addresses
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*/
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sgp = nip->nif_pif->pif_siginst;
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myip.s_addr = IA_SIN(inp->inf_addr)->sin_addr.s_addr;
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/*
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* Target addresses must be ours
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*/
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if ((tip.s_addr != myip.s_addr) ||
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!ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &tatm) ||
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!ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel, &tatmsub))
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goto drop;
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/*
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* Drop packet if both Source addresses aren't present
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*/
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if ((sip.s_addr == 0) || (satm.address_format == T_ATM_ABSENT))
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goto drop;
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/*
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* If the Source addresses are ours, this is an arp server
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* registration response
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*/
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if (ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &satm) &&
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ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel, &satmsub)) {
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if (sip.s_addr == myip.s_addr) {
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/*
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* Registration response - update our state and
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* set a registration refresh timer
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*/
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if (uip->uip_arpstate == UIAS_CLIENT_REGISTER)
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uip->uip_arpstate = UIAS_CLIENT_ACTIVE;
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if (uip->uip_arpstate == UIAS_CLIENT_ACTIVE) {
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UNIIP_ARP_CANCEL(uip);
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UNIIP_ARP_TIMER(uip, UNIARP_REGIS_REFRESH);
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}
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/*
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* If the cache entry for the server VCC isn't valid
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* yet, then send an Inverse ATMARP request to solicit
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* the server's IP address
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*/
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uap = (struct uniarp *)ivp->iv_arpent;
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if ((uap->ua_flags & UAF_VALID) == 0) {
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(void) uniarp_inarp_req(uip, &uap->ua_dstatm,
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&uap->ua_dstatmsub, ivp);
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}
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goto drop;
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} else {
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log(LOG_WARNING,
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"uniarp: arpserver has our IP address wrong\n");
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goto drop;
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}
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} else if (sip.s_addr == myip.s_addr) {
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log(LOG_WARNING,
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"uniarp: arpserver has our ATM address wrong\n");
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goto drop;
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}
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/*
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* Validate the Source IP address
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*/
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if (uniarp_validate_ip(uip, &sip, UAO_LOOKUP) != 0)
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goto drop;
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/*
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* Now we believe this packet contains an authoritative mapping,
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* which we probably need to setup an outgoing SVC connection
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*/
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(void) uniarp_cache_svc(uip, &sip, &satm, &satmsub, UAO_LOOKUP);
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drop:
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(void) splx(s);
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KB_FREEALL(m);
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return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Process an ATMARP negative ack packet
|
|
*
|
|
* Arguments:
|
|
* ivp pointer to input VCC's IPVCC control block
|
|
* m pointer to input packet buffer chain
|
|
*
|
|
* Returns:
|
|
* none
|
|
*
|
|
*/
|
|
static void
|
|
proc_arp_nak(ivp, m)
|
|
struct ipvcc *ivp;
|
|
KBuffer *m;
|
|
{
|
|
struct ip_nif *inp;
|
|
struct atm_nif *nip;
|
|
struct siginst *sgp;
|
|
struct uniip *uip;
|
|
struct uniarp *uap;
|
|
struct in_addr myip;
|
|
struct ipvcc *inext;
|
|
int s = splnet();
|
|
|
|
/*
|
|
* Only the arp server should send these
|
|
*/
|
|
inp = ivp->iv_ipnif;
|
|
nip = inp->inf_nif;
|
|
uip = (struct uniip *)inp->inf_isintf;
|
|
if ((uip == NULL) ||
|
|
(uip->uip_arpsvrvcc != ivp))
|
|
goto drop;
|
|
|
|
/*
|
|
* Locate our addresses
|
|
*/
|
|
sgp = nip->nif_pif->pif_siginst;
|
|
myip.s_addr = IA_SIN(inp->inf_addr)->sin_addr.s_addr;
|
|
|
|
/*
|
|
* Source addresses must be ours
|
|
*/
|
|
if ((sip.s_addr != myip.s_addr) ||
|
|
!ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &satm) ||
|
|
!ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel, &satmsub))
|
|
goto drop;
|
|
|
|
/*
|
|
* Drop packet if the Target IP address isn't there or if this
|
|
* is a registration response, indicating an old or flakey server
|
|
*/
|
|
if ((tip.s_addr == 0) || (tip.s_addr == myip.s_addr))
|
|
goto drop;
|
|
|
|
/*
|
|
* Otherwise, see who we were looking for
|
|
*/
|
|
UNIARP_LOOKUP(tip.s_addr, uap);
|
|
if (uap == NULL)
|
|
goto drop;
|
|
|
|
/*
|
|
* This entry isn't valid any longer, so notify all VCCs using this
|
|
* entry that they must finish up. The last notify should cause
|
|
* this entry to be freed by the vcclose() function.
|
|
*/
|
|
uap->ua_flags &= ~UAF_VALID;
|
|
for (ivp = uap->ua_ivp; ivp; ivp = inext) {
|
|
inext = ivp->iv_arpnext;
|
|
(*inp->inf_arpnotify)(ivp, MAP_FAILED);
|
|
}
|
|
|
|
drop:
|
|
(void) splx(s);
|
|
KB_FREEALL(m);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Process an InATMARP request packet
|
|
*
|
|
* Arguments:
|
|
* ivp pointer to input VCC's IPVCC control block
|
|
* m pointer to input packet buffer chain
|
|
*
|
|
* Returns:
|
|
* none
|
|
*
|
|
*/
|
|
static void
|
|
proc_inarp_req(ivp, m)
|
|
struct ipvcc *ivp;
|
|
KBuffer *m;
|
|
{
|
|
struct ip_nif *inp;
|
|
struct atm_nif *nip;
|
|
struct siginst *sgp;
|
|
struct uniip *uip;
|
|
struct in_addr myip;
|
|
int s = splnet();
|
|
|
|
/*
|
|
* Get interface pointers
|
|
*/
|
|
inp = ivp->iv_ipnif;
|
|
nip = inp->inf_nif;
|
|
uip = (struct uniip *)inp->inf_isintf;
|
|
if (uip == NULL)
|
|
goto drop;
|
|
|
|
/*
|
|
* Locate our addresses
|
|
*/
|
|
sgp = nip->nif_pif->pif_siginst;
|
|
myip.s_addr = IA_SIN(inp->inf_addr)->sin_addr.s_addr;
|
|
|
|
/*
|
|
* Packet must have a Source IP address and, if it was received
|
|
* over an SVC, a Source ATM address too.
|
|
*/
|
|
if ((sip.s_addr == 0) ||
|
|
((ivp->iv_flags & IVF_SVC) && (satm.address_format == T_ATM_ABSENT)))
|
|
goto drop;
|
|
|
|
/*
|
|
* Validate Source ATM address
|
|
* - can't be me
|
|
*/
|
|
if (satm.address_format != T_ATM_ABSENT) {
|
|
if (ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &satm) &&
|
|
ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel,
|
|
&satmsub))
|
|
goto drop;
|
|
}
|
|
|
|
/*
|
|
* Validate Source IP address
|
|
*/
|
|
if ((sip.s_addr == myip.s_addr) ||
|
|
(uniarp_validate_ip(uip, &sip, UAO_PEER_REQ) != 0))
|
|
goto drop;
|
|
|
|
/*
|
|
* The Target ATM address is required for a packet received over
|
|
* an SVC, optional for a PVC. If one is present, it must be our
|
|
* address.
|
|
*/
|
|
if ((ivp->iv_flags & IVF_SVC) && (tatm.address_format == T_ATM_ABSENT))
|
|
goto drop;
|
|
if ((tatm.address_format != T_ATM_ABSENT) &&
|
|
(!ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &tatm) ||
|
|
!ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel, &tatmsub)))
|
|
goto drop;
|
|
|
|
/*
|
|
* See where this packet is from
|
|
*/
|
|
if (ivp->iv_flags & IVF_PVC) {
|
|
/*
|
|
* Process the PVC arp data, although we don't really
|
|
* update the arp cache with this information
|
|
*/
|
|
uniarp_cache_pvc(ivp, &sip, &satm, &satmsub);
|
|
|
|
} else if (uip->uip_arpsvrvcc == ivp) {
|
|
/*
|
|
* Packet is from the arp server, so we've received a
|
|
* registration/refresh request (1577 version).
|
|
*
|
|
* Therefore, update cache with authoritative data.
|
|
*/
|
|
(void) uniarp_cache_svc(uip, &sip, &satm, &satmsub, UAO_LOOKUP);
|
|
|
|
/*
|
|
* Make sure the cache update didn't kill the server VCC
|
|
*/
|
|
if (uip->uip_arpsvrvcc != ivp)
|
|
goto drop;
|
|
|
|
/*
|
|
* Update the server state and set the
|
|
* registration refresh timer
|
|
*/
|
|
uip->uip_arpstate = UIAS_CLIENT_ACTIVE;
|
|
UNIIP_ARP_CANCEL(uip);
|
|
UNIIP_ARP_TIMER(uip, UNIARP_REGIS_REFRESH);
|
|
} else {
|
|
/*
|
|
* Otherwise, we consider this source mapping data as
|
|
* non-authoritative and update the cache appropriately
|
|
*/
|
|
if (uniarp_cache_svc(uip, &sip, &satm, &satmsub, UAO_PEER_REQ))
|
|
goto drop;
|
|
}
|
|
|
|
/*
|
|
* Send an InATMARP response back to originator
|
|
*/
|
|
(void) uniarp_inarp_rsp(uip, &sip, &satm, &satmsub, ivp);
|
|
|
|
drop:
|
|
(void) splx(s);
|
|
KB_FREEALL(m);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Process an InATMARP response packet
|
|
*
|
|
* Arguments:
|
|
* ivp pointer to input VCC's IPVCC control block
|
|
* m pointer to input packet buffer chain
|
|
*
|
|
* Returns:
|
|
* none
|
|
*
|
|
*/
|
|
static void
|
|
proc_inarp_rsp(ivp, m)
|
|
struct ipvcc *ivp;
|
|
KBuffer *m;
|
|
{
|
|
struct ip_nif *inp;
|
|
struct atm_nif *nip;
|
|
struct siginst *sgp;
|
|
struct uniip *uip;
|
|
struct in_addr myip;
|
|
int s = splnet();
|
|
|
|
/*
|
|
* Get interface pointers
|
|
*/
|
|
inp = ivp->iv_ipnif;
|
|
nip = inp->inf_nif;
|
|
uip = (struct uniip *)inp->inf_isintf;
|
|
if (uip == NULL)
|
|
goto drop;
|
|
|
|
/*
|
|
* Locate our addresses
|
|
*/
|
|
sgp = nip->nif_pif->pif_siginst;
|
|
myip.s_addr = IA_SIN(inp->inf_addr)->sin_addr.s_addr;
|
|
|
|
/*
|
|
* Packet must have a Source IP address and, if it was received
|
|
* over an SVC, a Source ATM address too.
|
|
*/
|
|
if ((sip.s_addr == 0) ||
|
|
((ivp->iv_flags & IVF_SVC) && (satm.address_format == T_ATM_ABSENT)))
|
|
goto drop;
|
|
|
|
/*
|
|
* Validate Source ATM address
|
|
* - can't be me
|
|
*/
|
|
if (satm.address_format != T_ATM_ABSENT) {
|
|
if (ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &satm) &&
|
|
ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel,
|
|
&satmsub))
|
|
goto drop;
|
|
}
|
|
|
|
/*
|
|
* Validate Source IP address
|
|
* - must be in our LIS
|
|
* - can't be me
|
|
* - can't be broadcast
|
|
* - can't be multicast
|
|
*/
|
|
if ((sip.s_addr == myip.s_addr) ||
|
|
(uniarp_validate_ip(uip, &sip, UAO_PEER_RSP) != 0))
|
|
goto drop;
|
|
|
|
/*
|
|
* The Target ATM address is required for a packet received over
|
|
* an SVC, optional for a PVC. If one is present, it must be our
|
|
* address.
|
|
*/
|
|
if ((ivp->iv_flags & IVF_SVC) && (tatm.address_format == T_ATM_ABSENT))
|
|
goto drop;
|
|
if ((tatm.address_format != T_ATM_ABSENT) &&
|
|
(!ATM_ADDR_SEL_EQUAL(&sgp->si_addr, nip->nif_sel, &tatm) ||
|
|
!ATM_ADDR_SEL_EQUAL(&sgp->si_subaddr, nip->nif_sel, &tatmsub)))
|
|
goto drop;
|
|
|
|
/*
|
|
* See where this packet is from
|
|
*/
|
|
if (ivp->iv_flags & IVF_PVC) {
|
|
/*
|
|
* Process the PVC arp data, although we don't really
|
|
* update the arp cache with this information
|
|
*/
|
|
uniarp_cache_pvc(ivp, &sip, &satm, &satmsub);
|
|
|
|
} else {
|
|
/*
|
|
* Can't tell the difference between an RFC-1577 registration
|
|
* and a data connection from a client of another arpserver
|
|
* on our LIS (using SCSP) - so we'll update the cache now
|
|
* with what we've got. Our clients will get "registered"
|
|
* when (if) they query us with an arp request.
|
|
*/
|
|
(void) uniarp_cache_svc(uip, &sip, &satm, &satmsub,
|
|
UAO_PEER_RSP);
|
|
}
|
|
|
|
drop:
|
|
(void) splx(s);
|
|
KB_FREEALL(m);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Print an ATMARP PDU
|
|
*
|
|
* Arguments:
|
|
* ivp pointer to input VCC control block
|
|
* m pointer to pdu buffer chain
|
|
* msg pointer to message string
|
|
*
|
|
* Returns:
|
|
* none
|
|
*
|
|
*/
|
|
void
|
|
uniarp_pdu_print(ivp, m, msg)
|
|
struct ipvcc *ivp;
|
|
KBuffer *m;
|
|
char *msg;
|
|
{
|
|
char buf[128];
|
|
struct vccb *vcp;
|
|
|
|
vcp = ivp->iv_conn->co_connvc->cvc_vcc;
|
|
snprintf(buf, sizeof(buf),
|
|
"uniarp %s: vcc=(%d,%d)\n", msg, vcp->vc_vpi, vcp->vc_vci);
|
|
atm_pdu_print(m, buf);
|
|
}
|
|
|