515 lines
12 KiB
C
515 lines
12 KiB
C
/* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck Exp $ */
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/*-
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*
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* Copyright (c) 1996 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* if_atmsubr.c
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_mac.h"
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#include "opt_natm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_atm.h>
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#include <netinet/in.h>
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#include <netinet/if_atm.h>
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#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
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#if defined(INET) || defined(INET6)
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#include <netinet/in_var.h>
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#endif
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#ifdef NATM
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#include <netnatm/natm.h>
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#endif
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#include <security/mac/mac_framework.h>
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/*
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* Netgraph interface functions.
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* These need not be protected by a lock, because ng_atm nodes are persitent.
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* The ng_atm module can be unloaded only if all ATM interfaces have been
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* unloaded, so nobody should be in the code paths accessing these function
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* pointers.
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*/
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void (*ng_atm_attach_p)(struct ifnet *);
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void (*ng_atm_detach_p)(struct ifnet *);
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int (*ng_atm_output_p)(struct ifnet *, struct mbuf **);
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void (*ng_atm_input_p)(struct ifnet *, struct mbuf **,
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struct atm_pseudohdr *, void *);
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void (*ng_atm_input_orphan_p)(struct ifnet *, struct mbuf *,
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struct atm_pseudohdr *, void *);
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void (*ng_atm_event_p)(struct ifnet *, uint32_t, void *);
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/*
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* Harp pseudo interface hooks
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*/
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void (*atm_harp_input_p)(struct ifnet *ifp, struct mbuf **m,
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struct atm_pseudohdr *ah, void *rxhand);
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void (*atm_harp_attach_p)(struct ifnet *);
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void (*atm_harp_detach_p)(struct ifnet *);
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void (*atm_harp_event_p)(struct ifnet *, uint32_t, void *);
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SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware");
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MALLOC_DEFINE(M_IFATM, "ifatm", "atm interface internals");
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#ifndef ETHERTYPE_IPV6
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#define ETHERTYPE_IPV6 0x86dd
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#endif
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#define senderr(e) do { error = (e); goto bad; } while (0)
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/*
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* atm_output: ATM output routine
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* inputs:
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* "ifp" = ATM interface to output to
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* "m0" = the packet to output
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* "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
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* "rt0" = the route to use
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* returns: error code [0 == ok]
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*
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* note: special semantic: if (dst == NULL) then we assume "m" already
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* has an atm_pseudohdr on it and just send it directly.
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* [for native mode ATM output] if dst is null, then
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* rt0 must also be NULL.
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*/
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int
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atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
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struct rtentry *rt0)
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{
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u_int16_t etype = 0; /* if using LLC/SNAP */
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int error = 0, sz;
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struct atm_pseudohdr atmdst, *ad;
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struct mbuf *m = m0;
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struct atmllc *atmllc;
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struct atmllc *llc_hdr = NULL;
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u_int32_t atm_flags;
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#ifdef MAC
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error = mac_check_ifnet_transmit(ifp, m);
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if (error)
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senderr(error);
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#endif
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if (!((ifp->if_flags & IFF_UP) &&
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(ifp->if_drv_flags & IFF_DRV_RUNNING)))
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senderr(ENETDOWN);
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/*
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* check for non-native ATM traffic (dst != NULL)
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*/
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if (dst) {
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switch (dst->sa_family) {
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#if defined(INET) || defined(INET6)
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case AF_INET:
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case AF_INET6:
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{
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struct rtentry *rt = NULL;
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/*
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* check route
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*/
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if (rt0 != NULL) {
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error = rt_check(&rt, &rt0, dst);
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if (error)
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goto bad;
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RT_UNLOCK(rt);
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}
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if (dst->sa_family == AF_INET6)
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etype = ETHERTYPE_IPV6;
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else
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etype = ETHERTYPE_IP;
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if (!atmresolve(rt, m, dst, &atmdst)) {
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m = NULL;
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/* XXX: atmresolve already free'd it */
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senderr(EHOSTUNREACH);
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/* XXX: put ATMARP stuff here */
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/* XXX: watch who frees m on failure */
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}
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}
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break;
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#endif /* INET || INET6 */
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case AF_UNSPEC:
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/*
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* XXX: bpfwrite. assuming dst contains 12 bytes
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* (atm pseudo header (4) + LLC/SNAP (8))
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*/
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bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
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llc_hdr = (struct atmllc *)(dst->sa_data +
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sizeof(atmdst));
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break;
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default:
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printf("%s: can't handle af%d\n", ifp->if_xname,
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dst->sa_family);
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senderr(EAFNOSUPPORT);
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}
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/*
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* must add atm_pseudohdr to data
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*/
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sz = sizeof(atmdst);
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atm_flags = ATM_PH_FLAGS(&atmdst);
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if (atm_flags & ATM_PH_LLCSNAP)
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sz += 8; /* sizeof snap == 8 */
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M_PREPEND(m, sz, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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ad = mtod(m, struct atm_pseudohdr *);
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*ad = atmdst;
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if (atm_flags & ATM_PH_LLCSNAP) {
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atmllc = (struct atmllc *)(ad + 1);
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if (llc_hdr == NULL) {
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bcopy(ATMLLC_HDR, atmllc->llchdr,
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sizeof(atmllc->llchdr));
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/* note: in host order */
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ATM_LLC_SETTYPE(atmllc, etype);
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}
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else
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bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
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}
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}
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if (ng_atm_output_p != NULL) {
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if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) {
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if (m != NULL)
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m_freem(m);
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return (error);
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}
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if (m == NULL)
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return (0);
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}
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/*
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* Queue message on interface, and start output if interface
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* not yet active.
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*/
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if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp,
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-(int)sizeof(struct atm_pseudohdr)))
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return (ENOBUFS);
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return (error);
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bad:
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if (m)
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m_freem(m);
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return (error);
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}
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/*
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* Process a received ATM packet;
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* the packet is in the mbuf chain m.
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*/
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void
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atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
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void *rxhand)
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{
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int isr;
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u_int16_t etype = ETHERTYPE_IP; /* default */
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if ((ifp->if_flags & IFF_UP) == 0) {
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m_freem(m);
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return;
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}
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#ifdef MAC
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mac_create_mbuf_from_ifnet(ifp, m);
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#endif
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ifp->if_ibytes += m->m_pkthdr.len;
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if (ng_atm_input_p != NULL) {
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(*ng_atm_input_p)(ifp, &m, ah, rxhand);
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if (m == NULL)
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return;
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}
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/* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */
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if (atm_harp_input_p != NULL) {
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(*atm_harp_input_p)(ifp, &m, ah, rxhand);
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if (m == NULL)
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return;
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}
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if (rxhand) {
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#ifdef NATM
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struct natmpcb *npcb;
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/*
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* XXXRW: this use of 'rxhand' is not a very good idea, and
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* was subject to races even before SMPng due to the release
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* of spl here.
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*/
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NATM_LOCK();
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npcb = rxhand;
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npcb->npcb_inq++; /* count # in queue */
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isr = NETISR_NATM;
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m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
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NATM_UNLOCK();
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#else
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printf("atm_input: NATM detected but not "
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"configured in kernel\n");
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goto dropit;
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#endif
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} else {
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/*
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* handle LLC/SNAP header, if present
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*/
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if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
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struct atmllc *alc;
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if (m->m_len < sizeof(*alc) &&
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(m = m_pullup(m, sizeof(*alc))) == 0)
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return; /* failed */
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alc = mtod(m, struct atmllc *);
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if (bcmp(alc, ATMLLC_HDR, 6)) {
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printf("%s: recv'd invalid LLC/SNAP frame "
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"[vp=%d,vc=%d]\n", ifp->if_xname,
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ATM_PH_VPI(ah), ATM_PH_VCI(ah));
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m_freem(m);
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return;
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}
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etype = ATM_LLC_TYPE(alc);
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m_adj(m, sizeof(*alc));
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}
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switch (etype) {
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#ifdef INET
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case ETHERTYPE_IP:
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isr = NETISR_IP;
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break;
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#endif
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#ifdef INET6
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case ETHERTYPE_IPV6:
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isr = NETISR_IPV6;
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break;
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#endif
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default:
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#ifndef NATM
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dropit:
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#endif
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if (ng_atm_input_orphan_p != NULL)
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(*ng_atm_input_orphan_p)(ifp, m, ah, rxhand);
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else
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m_freem(m);
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return;
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}
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}
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netisr_dispatch(isr, m);
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}
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/*
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* Perform common duties while attaching to interface list.
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*/
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void
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atm_ifattach(struct ifnet *ifp)
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{
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struct ifaddr *ifa;
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struct sockaddr_dl *sdl;
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struct ifatm *ifatm = ifp->if_l2com;
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ifp->if_addrlen = 0;
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ifp->if_hdrlen = 0;
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if_attach(ifp);
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ifp->if_mtu = ATMMTU;
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ifp->if_output = atm_output;
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#if 0
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ifp->if_input = atm_input;
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#endif
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ifp->if_snd.ifq_maxlen = 50; /* dummy */
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TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
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if (ifa->ifa_addr->sa_family == AF_LINK) {
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sdl = (struct sockaddr_dl *)ifa->ifa_addr;
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sdl->sdl_type = IFT_ATM;
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sdl->sdl_alen = ifp->if_addrlen;
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#ifdef notyet /* if using ATMARP, store hardware address using the next line */
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bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
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#endif
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break;
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}
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ifp->if_linkmib = &ifatm->mib;
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ifp->if_linkmiblen = sizeof(ifatm->mib);
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if(ng_atm_attach_p)
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(*ng_atm_attach_p)(ifp);
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if (atm_harp_attach_p)
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(*atm_harp_attach_p)(ifp);
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}
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/*
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* Common stuff for detaching an ATM interface
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*/
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void
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atm_ifdetach(struct ifnet *ifp)
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{
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if (atm_harp_detach_p)
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(*atm_harp_detach_p)(ifp);
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if(ng_atm_detach_p)
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(*ng_atm_detach_p)(ifp);
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if_detach(ifp);
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}
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/*
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* Support routine for the SIOCATMGVCCS ioctl().
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*
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* This routine assumes, that the private VCC structures used by the driver
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* begin with a struct atmio_vcc.
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*
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* Return a table of VCCs in a freshly allocated memory area.
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* Here we have a problem: we first count, how many vccs we need
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* to return. The we allocate the memory and finally fill it in.
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* Because we cannot lock while calling malloc, the number of active
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* vccs may change while we're in malloc. So we allocate a couple of
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* vccs more and if space anyway is not enough re-iterate.
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*
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* We could use an sx lock for the vcc tables.
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*/
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struct atmio_vcctable *
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atm_getvccs(struct atmio_vcc **table, u_int size, u_int start,
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struct mtx *lock, int waitok)
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{
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u_int cid, alloc;
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size_t len;
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struct atmio_vcctable *vccs;
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struct atmio_vcc *v;
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alloc = start + 10;
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vccs = NULL;
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for (;;) {
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len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]);
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vccs = reallocf(vccs, len, M_TEMP,
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waitok ? M_WAITOK : M_NOWAIT);
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if (vccs == NULL)
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return (NULL);
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bzero(vccs, len);
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vccs->count = 0;
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v = vccs->vccs;
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mtx_lock(lock);
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for (cid = 0; cid < size; cid++)
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if (table[cid] != NULL) {
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if (++vccs->count == alloc)
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/* too many - try again */
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break;
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*v++ = *table[cid];
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}
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mtx_unlock(lock);
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if (cid == size)
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break;
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alloc *= 2;
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}
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return (vccs);
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}
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/*
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* Driver or channel state has changed. Inform whoever is interested
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* in these events.
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*/
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void
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atm_event(struct ifnet *ifp, u_int event, void *arg)
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{
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if (ng_atm_event_p != NULL)
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(*ng_atm_event_p)(ifp, event, arg);
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if (atm_harp_event_p != NULL)
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(*atm_harp_event_p)(ifp, event, arg);
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}
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static void *
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atm_alloc(u_char type, struct ifnet *ifp)
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{
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struct ifatm *ifatm;
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ifatm = malloc(sizeof(struct ifatm), M_IFATM, M_WAITOK | M_ZERO);
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ifatm->ifp = ifp;
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return (ifatm);
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}
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static void
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atm_free(void *com, u_char type)
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{
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free(com, M_IFATM);
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}
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static int
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atm_modevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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if_register_com_alloc(IFT_ATM, atm_alloc, atm_free);
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break;
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case MOD_UNLOAD:
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if_deregister_com_alloc(IFT_ATM);
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t atm_mod = {
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"atm",
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atm_modevent,
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0
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};
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DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
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MODULE_VERSION(atm, 1);
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