ec826ad5c7
1. separating L2 tables (ARP, NDP) from the L3 routing tables
2. removing as much locking dependencies among these layers as
possible to allow for some parallelism in the search operations
3. simplify the logic in the routing code,
The most notable end result is the obsolescent of the route
cloning (RTF_CLONING) concept, which translated into code reduction
in both IPv4 ARP and IPv6 NDP related modules, and size reduction in
struct rtentry{}. The change in design obsoletes the semantics of
RTF_CLONING, RTF_WASCLONE and RTF_LLINFO routing flags. The userland
applications such as "arp" and "ndp" have been modified to reflect
those changes. The output from "netstat -r" shows only the routing
entries.
Quite a few developers have contributed to this project in the
past: Glebius Smirnoff, Luigi Rizzo, Alessandro Cerri, and
Andre Oppermann. And most recently:
- Kip Macy revised the locking code completely, thus completing
the last piece of the puzzle, Kip has also been conducting
active functional testing
- Sam Leffler has helped me improving/refactoring the code, and
provided valuable reviews
- Julian Elischer setup the perforce tree for me and has helped
me maintaining that branch before the svn conversion
504 lines
12 KiB
C
504 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_ifnet_check_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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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(rt0, 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_ifnet_create_mbuf(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);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static moduledata_t atm_mod = {
|
|
"atm",
|
|
atm_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
|
|
MODULE_VERSION(atm, 1);
|