freebsd-skq/sys/netatm/ipatm/ipatm_output.c

218 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;
if (ipatm_print) {
atm_pdu_print(m, "ipatm_ifoutput");
}
/*
* 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);
}