217 lines
4.8 KiB
C
217 lines
4.8 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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* @(#) $Id: ipatm_output.c,v 1.1 1998/09/15 08:23:01 phk Exp $
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*
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*/
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/*
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* IP Over ATM Support
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* -------------------
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*
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* Output IP packets across an ATM VCC
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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.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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#ifndef lint
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__RCSID("@(#) $Id: ipatm_output.c,v 1.1 1998/09/15 08:23:01 phk Exp $");
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#endif
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/*
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* Output an IP Packet
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*
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* All IP packets output to an ATM interface will be directed here via
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* the atm_ifoutput() function. If there is an ATM VCC already setup for
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* the destination IP address, then we'll just send the packet to that VCC.
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* Otherwise we will have to setup a new VCC, ARPing for the corresponding
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* destination ATM hardware address along the way.
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*
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* Arguments:
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* ifp pointer to ifnet structure
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* m pointer to packet buffer chain to be output
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* dst pointer to packet's IP destination address
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*
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* Returns:
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* 0 packet "output" was successful
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* errno output failed - reason indicated
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*
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*/
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int
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ipatm_ifoutput(ifp, m, dst)
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struct ifnet *ifp;
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KBuffer *m;
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struct sockaddr *dst;
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{
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struct ipvcc *ivp;
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int err = 0;
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#ifdef DIAGNOSTIC
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if (ipatm_print) {
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atm_pdu_print(m, "ipatm_ifoutput");
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}
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#endif
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/*
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* See if we've already got an appropriate VCC
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*/
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ivp = ipatm_iptovc((struct sockaddr_in *)dst, (struct atm_nif *)ifp);
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if (ivp) {
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/*
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* Reset idle timer
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*/
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ivp->iv_idle = 0;
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/*
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* Can we use this VCC now??
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*/
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if ((ivp->iv_state == IPVCC_ACTIVE) &&
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(ivp->iv_flags & IVF_MAPOK)) {
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/*
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* OK, now send packet
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*/
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err = atm_cm_cpcs_data(ivp->iv_conn, m);
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if (err) {
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/*
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* Output problem, drop packet
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*/
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KB_FREEALL(m);
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}
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} else {
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/*
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* VCC is unavailable for data packets. Queue packet
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* for now, but only maintain a queue length of one.
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*/
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if (ivp->iv_queue)
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KB_FREEALL(ivp->iv_queue);
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ivp->iv_queue = m;
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}
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} else {
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struct in_ifaddr *ia;
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#if (defined(BSD) && (BSD < 199306))
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extern struct ifnet loif;
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#endif
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/*
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* No VCC to destination
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*/
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/*
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* Is packet for our interface address?
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*/
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TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
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if (ia->ia_ifp != ifp)
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continue;
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if (((struct sockaddr_in *)dst)->sin_addr.s_addr ==
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IA_SIN(ia)->sin_addr.s_addr) {
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/*
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* It's for us - hand packet to loopback driver
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*/
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(void) if_simloop(ifp, m, dst, 0);
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goto done;
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}
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}
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/*
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* Is this a broadcast packet ??
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*/
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#if (defined(BSD) && (BSD >= 199306))
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if (in_broadcast(((struct sockaddr_in *)dst)->sin_addr, ifp)) {
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#else
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if (in_broadcast(((struct sockaddr_in *)dst)->sin_addr)) {
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#endif
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struct ip_nif *inp;
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int s;
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/*
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* If interface server exists and provides broadcast
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* services, then let it deal with this packet
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*/
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s = splnet();
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for (inp = ipatm_nif_head; inp; inp = inp->inf_next) {
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if (inp->inf_nif == (struct atm_nif *)ifp)
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break;
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}
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(void) splx(s);
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if ((inp == NULL) ||
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(inp->inf_serv == NULL) ||
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(inp->inf_serv->is_bcast_output == NULL)) {
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KB_FREEALL(m);
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err = EADDRNOTAVAIL;
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goto done;
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}
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err = (*inp->inf_serv->is_bcast_output)(inp, m);
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goto done;
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}
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/*
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* How about a multicast packet ??
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*/
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if (IN_MULTICAST(ntohl(SATOSIN(dst)->sin_addr.s_addr))) {
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/*
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* Multicast isn't currently supported
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*/
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KB_FREEALL(m);
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err = EADDRNOTAVAIL;
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goto done;
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}
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/*
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* Well, I guess we need to create an SVC to the destination
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*/
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if ((err = ipatm_createsvc(ifp, AF_INET,
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(caddr_t)&((struct sockaddr_in *)dst)->sin_addr,
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&ivp)) == 0) {
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/*
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* SVC open is proceeding, queue packet
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*/
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ivp->iv_queue = m;
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} else {
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/*
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* SVC open failed, release buffers and return
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*/
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KB_FREEALL(m);
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}
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}
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done:
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return (err);
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}
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