026e67b69b
Approved by: Robert Watson <rwatson@freebsd.org> Add locking to the IPv6 scoping code. All spl() like calls have also been removed. Cleaning up the handling of ifnet data will happen at a later date.
395 lines
9.2 KiB
C
395 lines
9.2 KiB
C
/* $FreeBSD$ */
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/* $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ */
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/*
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* Copyright (C) 2000 WIDE Project.
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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. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <net/route.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/scope6_var.h>
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/*
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* The scope6_lock protects the global sid default stored in
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* sid_default below.
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*/
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static struct mtx scope6_lock;
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#define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF)
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#define SCOPE6_LOCK() mtx_lock(&scope6_lock)
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#define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock)
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#define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED)
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static struct scope6_id sid_default;
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#define SID(ifp) \
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(((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id)
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void
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scope6_init()
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{
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SCOPE6_LOCK_INIT();
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bzero(&sid_default, sizeof(sid_default));
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}
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struct scope6_id *
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scope6_ifattach(ifp)
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struct ifnet *ifp;
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{
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struct scope6_id *sid;
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sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK);
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bzero(sid, sizeof(*sid));
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/*
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* XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
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* Should we rather hardcode here?
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*/
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sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index;
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sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
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#ifdef MULTI_SCOPE
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/* by default, we don't care about scope boundary for these scopes. */
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sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
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sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
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#endif
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return sid;
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}
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void
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scope6_ifdetach(sid)
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struct scope6_id *sid;
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{
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free(sid, M_IFADDR);
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}
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int
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scope6_set(ifp, idlist)
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struct ifnet *ifp;
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struct scope6_id *idlist;
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{
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int i;
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int error = 0;
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struct scope6_id *sid = NULL;
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IF_AFDATA_LOCK(ifp);
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sid = SID(ifp);
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if (!sid) { /* paranoid? */
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IF_AFDATA_UNLOCK(ifp);
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return (EINVAL);
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}
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/*
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* XXX: We need more consistency checks of the relationship among
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* scopes (e.g. an organization should be larger than a site).
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*/
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/*
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* TODO(XXX): after setting, we should reflect the changes to
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* interface addresses, routing table entries, PCB entries...
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*/
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SCOPE6_LOCK();
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for (i = 0; i < 16; i++) {
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if (idlist->s6id_list[i] &&
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idlist->s6id_list[i] != sid->s6id_list[i]) {
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/*
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* An interface zone ID must be the corresponding
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* interface index by definition.
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*/
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if (i == IPV6_ADDR_SCOPE_INTFACELOCAL &&
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idlist->s6id_list[i] != ifp->if_index) {
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IF_AFDATA_UNLOCK(ifp);
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SCOPE6_UNLOCK();
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return (EINVAL);
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}
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if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
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idlist->s6id_list[i] > if_index) {
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/*
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* XXX: theoretically, there should be no
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* relationship between link IDs and interface
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* IDs, but we check the consistency for
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* safety in later use.
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*/
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IF_AFDATA_UNLOCK(ifp);
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SCOPE6_UNLOCK();
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return (EINVAL);
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}
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/*
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* XXX: we must need lots of work in this case,
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* but we simply set the new value in this initial
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* implementation.
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*/
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sid->s6id_list[i] = idlist->s6id_list[i];
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}
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}
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SCOPE6_UNLOCK();
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IF_AFDATA_UNLOCK(ifp);
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return (error);
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}
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int
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scope6_get(ifp, idlist)
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struct ifnet *ifp;
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struct scope6_id *idlist;
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{
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/* We only need to lock the interface's afdata for SID() to work. */
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IF_AFDATA_LOCK(ifp);
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struct scope6_id *sid = SID(ifp);
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if (sid == NULL) { /* paranoid? */
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IF_AFDATA_UNLOCK(ifp);
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return (EINVAL);
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}
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SCOPE6_LOCK();
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*idlist = *sid;
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SCOPE6_UNLOCK();
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IF_AFDATA_UNLOCK(ifp);
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return (0);
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}
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/*
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* Get a scope of the address. Node-local, link-local, site-local or global.
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*/
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int
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in6_addrscope(addr)
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struct in6_addr *addr;
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{
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int scope;
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if (addr->s6_addr[0] == 0xfe) {
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scope = addr->s6_addr[1] & 0xc0;
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switch (scope) {
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case 0x80:
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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break;
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case 0xc0:
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return IPV6_ADDR_SCOPE_SITELOCAL;
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break;
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default:
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return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
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break;
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}
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}
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if (addr->s6_addr[0] == 0xff) {
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scope = addr->s6_addr[1] & 0x0f;
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/*
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* due to other scope such as reserved,
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* return scope doesn't work.
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*/
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switch (scope) {
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case IPV6_ADDR_SCOPE_INTFACELOCAL:
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return IPV6_ADDR_SCOPE_INTFACELOCAL;
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break;
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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break;
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case IPV6_ADDR_SCOPE_SITELOCAL:
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return IPV6_ADDR_SCOPE_SITELOCAL;
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break;
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default:
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return IPV6_ADDR_SCOPE_GLOBAL;
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break;
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}
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}
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/*
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* Regard loopback and unspecified addresses as global, since
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* they have no ambiguity.
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*/
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if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
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if (addr->s6_addr[15] == 1) /* loopback */
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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if (addr->s6_addr[15] == 0) /* unspecified */
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return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */
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}
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return IPV6_ADDR_SCOPE_GLOBAL;
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}
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/*
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* When we introduce the "4+28" split semantics in sin6_scope_id,
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* a 32bit integer is not enough to tell a large ID from an error (-1).
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* So, we intentionally use a large type as the return value.
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*/
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int
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in6_addr2zoneid(ifp, addr, ret_id)
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struct ifnet *ifp; /* must not be NULL */
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struct in6_addr *addr; /* must not be NULL */
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u_int32_t *ret_id; /* must not be NULL */
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{
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int scope;
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u_int32_t zoneid = 0;
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struct scope6_id *sid = NULL;
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IF_AFDATA_LOCK(ifp);
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sid = SID(ifp);
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#ifdef DIAGNOSTIC
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if (sid == NULL) { /* should not happen */
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panic("in6_addr2zoneid: scope array is NULL");
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/* NOTREACHED */
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}
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if (ret_id == NULL) {
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panic("in6_addr2zoneid: return ID is null");
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/* NOTREACHED */
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}
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#endif
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/*
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* special case: the loopback address can only belong to a loopback
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* interface.
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*/
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if (IN6_IS_ADDR_LOOPBACK(addr)) {
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if (!(ifp->if_flags & IFF_LOOPBACK)) {
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IF_AFDATA_UNLOCK(ifp);
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return (-1);
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} else {
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*ret_id = 0; /* there's no ambiguity */
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IF_AFDATA_UNLOCK(ifp);
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return (0);
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}
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}
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scope = in6_addrscope(addr);
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/*
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* XXX: These are all u_int32_t reads, so may not require locking.
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*/
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SCOPE6_LOCK();
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switch (scope) {
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case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL];
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break;
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL];
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break;
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case IPV6_ADDR_SCOPE_SITELOCAL:
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL];
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break;
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case IPV6_ADDR_SCOPE_ORGLOCAL:
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zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
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break;
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default:
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zoneid = 0; /* XXX: treat as global. */
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break;
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}
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SCOPE6_UNLOCK();
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*ret_id = zoneid;
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IF_AFDATA_UNLOCK(ifp);
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return (0);
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}
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void
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scope6_setdefault(ifp)
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struct ifnet *ifp; /* note that this might be NULL */
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{
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/*
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* Currently, this function just sets the default "interfaces"
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* and "links" according to the given interface.
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* We might eventually have to separate the notion of "link" from
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* "interface" and provide a user interface to set the default.
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*/
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SCOPE6_LOCK();
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if (ifp) {
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sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] =
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ifp->if_index;
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sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
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ifp->if_index;
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} else {
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sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0;
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sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
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}
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SCOPE6_UNLOCK();
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}
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int
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scope6_get_default(idlist)
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struct scope6_id *idlist;
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{
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SCOPE6_LOCK();
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*idlist = sid_default;
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SCOPE6_UNLOCK();
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return (0);
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}
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u_int32_t
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scope6_addr2default(addr)
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struct in6_addr *addr;
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{
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u_int32_t id;
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/*
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* special case: The loopback address should be considered as
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* link-local, but there's no ambiguity in the syntax.
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*/
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if (IN6_IS_ADDR_LOOPBACK(addr))
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return (0);
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/*
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* XXX: 32-bit read is atomic on all our platforms, is it OK
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* not to lock here?
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*/
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SCOPE6_LOCK();
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id = sid_default.s6id_list[in6_addrscope(addr)];
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SCOPE6_UNLOCK();
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return (id);
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}
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