221 lines
4.9 KiB
C
221 lines
4.9 KiB
C
/*
|
|
* ===================================
|
|
* HARP | Host ATM Research Platform
|
|
* ===================================
|
|
*
|
|
*
|
|
* This Host ATM Research Platform ("HARP") file (the "Software") is
|
|
* made available by Network Computing Services, Inc. ("NetworkCS")
|
|
* "AS IS". NetworkCS does not provide maintenance, improvements or
|
|
* support of any kind.
|
|
*
|
|
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
|
|
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
|
|
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
|
|
* In no event shall NetworkCS be responsible for any damages, including
|
|
* but not limited to consequential damages, arising from or relating to
|
|
* any use of the Software or related support.
|
|
*
|
|
* Copyright 1994-1998 Network Computing Services, Inc.
|
|
*
|
|
* Copies of this Software may be made, however, the above copyright
|
|
* notice must be reproduced on all copies.
|
|
*/
|
|
|
|
/*
|
|
* IP Over ATM Support
|
|
* -------------------
|
|
*
|
|
* Output IP packets across an ATM VCC
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <net/if.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netatm/port.h>
|
|
#include <netatm/queue.h>
|
|
#include <netatm/atm.h>
|
|
#include <netatm/atm_sys.h>
|
|
#include <netatm/atm_sap.h>
|
|
#include <netatm/atm_cm.h>
|
|
#include <netatm/atm_if.h>
|
|
#include <netatm/atm_stack.h>
|
|
#include <netatm/atm_pcb.h>
|
|
#include <netatm/atm_var.h>
|
|
|
|
#include <netatm/ipatm/ipatm_var.h>
|
|
#include <netatm/ipatm/ipatm_serv.h>
|
|
|
|
/*
|
|
* Output an IP Packet
|
|
*
|
|
* All IP packets output to an ATM interface will be directed here via
|
|
* the atm_ifoutput() function. If there is an ATM VCC already setup for
|
|
* the destination IP address, then we'll just send the packet to that VCC.
|
|
* Otherwise we will have to setup a new VCC, ARPing for the corresponding
|
|
* destination ATM hardware address along the way.
|
|
*
|
|
* Arguments:
|
|
* ifp pointer to ifnet structure
|
|
* m pointer to packet buffer chain to be output
|
|
* dst pointer to packet's IP destination address
|
|
*
|
|
* Returns:
|
|
* 0 packet "output" was successful
|
|
* errno output failed - reason indicated
|
|
*
|
|
*/
|
|
int
|
|
ipatm_ifoutput(ifp, m, dst)
|
|
struct ifnet *ifp;
|
|
KBuffer *m;
|
|
struct sockaddr *dst;
|
|
{
|
|
struct ipvcc *ivp;
|
|
int err = 0;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (ipatm_print) {
|
|
atm_pdu_print(m, "ipatm_ifoutput");
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* See if we've already got an appropriate VCC
|
|
*/
|
|
ivp = ipatm_iptovc((struct sockaddr_in *)dst, (struct atm_nif *)ifp);
|
|
if (ivp) {
|
|
|
|
/*
|
|
* Reset idle timer
|
|
*/
|
|
ivp->iv_idle = 0;
|
|
|
|
/*
|
|
* Can we use this VCC now??
|
|
*/
|
|
if ((ivp->iv_state == IPVCC_ACTIVE) &&
|
|
(ivp->iv_flags & IVF_MAPOK)) {
|
|
|
|
/*
|
|
* OK, now send packet
|
|
*/
|
|
err = atm_cm_cpcs_data(ivp->iv_conn, m);
|
|
if (err) {
|
|
/*
|
|
* Output problem, drop packet
|
|
*/
|
|
KB_FREEALL(m);
|
|
}
|
|
} else {
|
|
|
|
/*
|
|
* VCC is unavailable for data packets. Queue packet
|
|
* for now, but only maintain a queue length of one.
|
|
*/
|
|
if (ivp->iv_queue)
|
|
KB_FREEALL(ivp->iv_queue);
|
|
|
|
ivp->iv_queue = m;
|
|
}
|
|
} else {
|
|
struct in_ifaddr *ia;
|
|
|
|
/*
|
|
* No VCC to destination
|
|
*/
|
|
|
|
/*
|
|
* Is packet for our interface address?
|
|
*/
|
|
TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
|
|
if (ia->ia_ifp != ifp)
|
|
continue;
|
|
if (((struct sockaddr_in *)dst)->sin_addr.s_addr ==
|
|
IA_SIN(ia)->sin_addr.s_addr) {
|
|
|
|
/*
|
|
* It's for us - hand packet to loopback driver
|
|
*/
|
|
(void) if_simloop(ifp, m, dst->sa_family, 0);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Is this a broadcast packet ??
|
|
*/
|
|
if (in_broadcast(((struct sockaddr_in *)dst)->sin_addr, ifp)) {
|
|
struct ip_nif *inp;
|
|
int s;
|
|
|
|
/*
|
|
* If interface server exists and provides broadcast
|
|
* services, then let it deal with this packet
|
|
*/
|
|
s = splnet();
|
|
for (inp = ipatm_nif_head; inp; inp = inp->inf_next) {
|
|
if (inp->inf_nif == (struct atm_nif *)ifp)
|
|
break;
|
|
}
|
|
(void) splx(s);
|
|
|
|
if ((inp == NULL) ||
|
|
(inp->inf_serv == NULL) ||
|
|
(inp->inf_serv->is_bcast_output == NULL)) {
|
|
KB_FREEALL(m);
|
|
err = EADDRNOTAVAIL;
|
|
goto done;
|
|
}
|
|
|
|
err = (*inp->inf_serv->is_bcast_output)(inp, m);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* How about a multicast packet ??
|
|
*/
|
|
if (IN_MULTICAST(ntohl(SATOSIN(dst)->sin_addr.s_addr))) {
|
|
/*
|
|
* Multicast isn't currently supported
|
|
*/
|
|
KB_FREEALL(m);
|
|
err = EADDRNOTAVAIL;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Well, I guess we need to create an SVC to the destination
|
|
*/
|
|
if ((err = ipatm_createsvc(ifp, AF_INET,
|
|
(caddr_t)&((struct sockaddr_in *)dst)->sin_addr,
|
|
&ivp)) == 0) {
|
|
/*
|
|
* SVC open is proceeding, queue packet
|
|
*/
|
|
ivp->iv_queue = m;
|
|
|
|
} else {
|
|
/*
|
|
* SVC open failed, release buffers and return
|
|
*/
|
|
KB_FREEALL(m);
|
|
}
|
|
}
|
|
|
|
done:
|
|
return (err);
|
|
}
|
|
|