Don't use rt_walktree to delete routes
Some functions use rt_walktree to scan the routing table and delete matched routes. However, we shouldn't use rt_walktree to delete routes because rt_walktree is recursive to the routing table (radix tree) and isn't friendly to MP-ification. rt_walktree allows a caller to pass a callback function to delete an matched entry. The callback function is called from an API of the radix tree (rn_walktree) but also calls an API of the radix tree to delete an entry. This change adds a new API of the radix tree, rn_search_matched, which returns a matched entry that is selected by a callback function passed by a caller and the caller itself deletes the entry. By using the API, we can avoid the recursive form.
This commit is contained in:
ozaki-r
parent
b146e1b741
commit
5879478f65
36
sys/net/if.c
36
sys/net/if.c
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@ -1,4 +1,4 @@
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/* $NetBSD: if.c,v 1.361 2016/11/05 23:30:22 pgoyette Exp $ */
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/* $NetBSD: if.c,v 1.362 2016/11/15 01:50:06 ozaki-r Exp $ */
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/*-
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* Copyright (c) 1999, 2000, 2001, 2008 The NetBSD Foundation, Inc.
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@ -90,7 +90,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.361 2016/11/05 23:30:22 pgoyette Exp $");
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__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.362 2016/11/15 01:50:06 ozaki-r Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_inet.h"
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@ -185,7 +185,7 @@ int ifqmaxlen = IFQ_MAXLEN;
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struct psref_class *ifa_psref_class __read_mostly;
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static int if_rt_walktree(struct rtentry *, void *);
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static int if_delroute_matcher(struct rtentry *, void *);
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static struct if_clone *if_clone_lookup(const char *, int *);
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@ -1279,11 +1279,9 @@ again:
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if_free_sadl(ifp);
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/* Walk the routing table looking for stragglers. */
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for (i = 0; i <= AF_MAX; i++) {
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while (rt_walktree(i, if_rt_walktree, ifp) == ERESTART)
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continue;
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}
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/* Delete stray routes from the routing table. */
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for (i = 0; i <= AF_MAX; i++)
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rt_delete_matched_entries(i, if_delroute_matcher, ifp);
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DOMAIN_FOREACH(dp) {
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if (dp->dom_ifdetach != NULL && ifp->if_afdata[dp->dom_family])
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@ -1403,28 +1401,14 @@ if_detach_queues(struct ifnet *ifp, struct ifqueue *q)
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* ifnet.
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*/
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static int
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if_rt_walktree(struct rtentry *rt, void *v)
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if_delroute_matcher(struct rtentry *rt, void *v)
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{
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struct ifnet *ifp = (struct ifnet *)v;
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int error;
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struct rtentry *retrt;
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if (rt->rt_ifp != ifp)
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if (rt->rt_ifp == ifp)
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return 1;
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else
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return 0;
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/* Delete the entry. */
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error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway,
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rt_mask(rt), rt->rt_flags, &retrt);
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if (error == 0) {
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KASSERT(retrt == rt);
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KASSERT((retrt->rt_flags & RTF_UP) == 0);
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retrt->rt_ifp = NULL;
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rtfree(retrt);
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} else {
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printf("%s: warning: unable to delete rtentry @ %p, "
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"error = %d\n", ifp->if_xname, rt, error);
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}
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return ERESTART;
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}
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/*
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@ -1,4 +1,4 @@
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/* $NetBSD: radix.c,v 1.45 2015/08/24 22:21:26 pooka Exp $ */
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/* $NetBSD: radix.c,v 1.46 2016/11/15 01:50:06 ozaki-r Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1993
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@ -36,7 +36,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: radix.c,v 1.45 2015/08/24 22:21:26 pooka Exp $");
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__KERNEL_RCSID(0, "$NetBSD: radix.c,v 1.46 2016/11/15 01:50:06 ozaki-r Exp $");
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#ifndef _NET_RADIX_H_
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#include <sys/param.h>
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@ -1005,6 +1005,37 @@ rn_walktree(
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/* NOTREACHED */
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}
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struct radix_node *
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rn_search_matched(struct radix_node_head *h,
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int (*matcher)(struct radix_node *, void *), void *w)
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{
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bool matched;
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struct radix_node *base, *next, *rn;
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/*
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* This gets complicated because we may delete the node
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* while applying the function f to it, so we need to calculate
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* the successor node in advance.
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*/
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rn = rn_walkfirst(h->rnh_treetop, NULL, NULL);
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for (;;) {
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base = rn;
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next = rn_walknext(rn, NULL, NULL);
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/* Process leaves */
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while ((rn = base) != NULL) {
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base = rn->rn_dupedkey;
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if (!(rn->rn_flags & RNF_ROOT)) {
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matched = (*matcher)(rn, w);
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if (matched)
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return rn;
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}
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}
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rn = next;
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if (rn->rn_flags & RNF_ROOT)
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return NULL;
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}
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/* NOTREACHED */
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}
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struct delayinit {
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void **head;
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int off;
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@ -1,4 +1,4 @@
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/* $NetBSD: radix.h,v 1.22 2009/05/27 17:46:50 pooka Exp $ */
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/* $NetBSD: radix.h,v 1.23 2016/11/15 01:50:06 ozaki-r Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1993
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@ -139,6 +139,10 @@ int rn_refines(const void *, const void *);
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int rn_walktree(struct radix_node_head *,
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int (*)(struct radix_node *, void *),
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void *);
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struct radix_node *
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rn_search_matched(struct radix_node_head *,
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int (*)(struct radix_node *, void *),
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void *);
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struct radix_node
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*rn_addmask(const void *, int, int),
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*rn_addroute(const void *, const void *, struct radix_node_head *,
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@ -1,4 +1,4 @@
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/* $NetBSD: route.c,v 1.181 2016/10/25 02:45:09 ozaki-r Exp $ */
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/* $NetBSD: route.c,v 1.182 2016/11/15 01:50:06 ozaki-r Exp $ */
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/*-
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* Copyright (c) 1998, 2008 The NetBSD Foundation, Inc.
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@ -97,7 +97,7 @@
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#endif
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: route.c,v 1.181 2016/10/25 02:45:09 ozaki-r Exp $");
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__KERNEL_RCSID(0, "$NetBSD: route.c,v 1.182 2016/11/15 01:50:06 ozaki-r Exp $");
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#include <sys/param.h>
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#ifdef RTFLUSH_DEBUG
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@ -116,6 +116,7 @@ __KERNEL_RCSID(0, "$NetBSD: route.c,v 1.181 2016/10/25 02:45:09 ozaki-r Exp $");
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#include <sys/pool.h>
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#include <sys/kauth.h>
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#include <sys/workqueue.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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@ -1634,6 +1635,44 @@ rt_check_reject_route(const struct rtentry *rt, const struct ifnet *ifp)
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return 0;
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}
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void
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rt_delete_matched_entries(sa_family_t family, int (*f)(struct rtentry *, void *),
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void *v)
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{
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for (;;) {
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int s;
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int error;
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struct rtentry *rt, *retrt = NULL;
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s = splsoftnet();
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rt = rtbl_search_matched_entry(family, f, v);
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if (rt == NULL) {
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splx(s);
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return;
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}
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rt->rt_refcnt++;
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splx(s);
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error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway,
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rt_mask(rt), rt->rt_flags, &retrt);
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if (error == 0) {
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KASSERT(retrt == rt);
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KASSERT((retrt->rt_flags & RTF_UP) == 0);
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retrt->rt_ifp = NULL;
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rtfree(rt);
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rtfree(retrt);
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} else if (error == ESRCH) {
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/* Someone deleted the entry already. */
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rtfree(rt);
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} else {
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log(LOG_ERR, "%s: unable to delete rtentry @ %p, "
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"error = %d\n", rt->rt_ifp->if_xname, rt, error);
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/* XXX how to treat this case? */
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}
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}
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}
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#ifdef DDB
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#include <machine/db_machdep.h>
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@ -1,4 +1,4 @@
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/* $NetBSD: route.h,v 1.106 2016/10/25 02:45:09 ozaki-r Exp $ */
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/* $NetBSD: route.h,v 1.107 2016/11/15 01:50:06 ozaki-r Exp $ */
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/*
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* Copyright (c) 1980, 1986, 1993
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@ -408,6 +408,8 @@ struct sockaddr *
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rt_gettag(const struct rtentry *);
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int rt_check_reject_route(const struct rtentry *, const struct ifnet *);
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void rt_delete_matched_entries(sa_family_t,
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int (*)(struct rtentry *, void *), void *);
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static inline void
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rt_assert_referenced(const struct rtentry *rt)
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@ -504,6 +506,9 @@ struct rtentry *
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rt_matchaddr(rtbl_t *, const struct sockaddr *);
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int rt_refines(const struct sockaddr *, const struct sockaddr *);
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int rt_walktree(sa_family_t, int (*)(struct rtentry *, void *), void *);
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struct rtentry *
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rtbl_search_matched_entry(sa_family_t,
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int (*)(struct rtentry *, void *), void *);
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void rtbl_init(void);
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#endif /* _KERNEL */
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@ -1,4 +1,4 @@
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/* $NetBSD: rtbl.c,v 1.3 2016/04/11 09:21:18 ozaki-r Exp $ */
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/* $NetBSD: rtbl.c,v 1.4 2016/11/15 01:50:06 ozaki-r Exp $ */
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/*-
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* Copyright (c) 1998, 2008, 2011 The NetBSD Foundation, Inc.
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@ -95,7 +95,7 @@
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#endif /* _KERNEL && _KERNEL_OPT */
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rtbl.c,v 1.3 2016/04/11 09:21:18 ozaki-r Exp $");
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__KERNEL_RCSID(0, "$NetBSD: rtbl.c,v 1.4 2016/11/15 01:50:06 ozaki-r Exp $");
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#include <sys/param.h>
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#include <sys/kmem.h>
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@ -204,6 +204,23 @@ rt_walktree(sa_family_t family, int (*f)(struct rtentry *, void *), void *v)
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return rn_walktree(&t->t_rnh, rt_walktree_visitor, &rw);
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}
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struct rtentry *
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rtbl_search_matched_entry(sa_family_t family,
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int (*f)(struct rtentry *, void *), void *v)
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{
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rtbl_t *t = rt_tables[family];
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struct rtwalk rw;
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if (t == NULL)
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return 0;
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rw.rw_f = f;
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rw.rw_v = v;
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return (struct rtentry *)
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rn_search_matched(&t->t_rnh, rt_walktree_visitor, &rw);
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}
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rtbl_t *
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rt_gettable(sa_family_t af)
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{
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@ -1,4 +1,4 @@
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/* $NetBSD: nd6_rtr.c,v 1.119 2016/08/16 10:31:57 roy Exp $ */
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/* $NetBSD: nd6_rtr.c,v 1.120 2016/11/15 01:50:06 ozaki-r Exp $ */
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/* $KAME: nd6_rtr.c,v 1.95 2001/02/07 08:09:47 itojun Exp $ */
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/*
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@ -31,7 +31,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nd6_rtr.c,v 1.119 2016/08/16 10:31:57 roy Exp $");
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__KERNEL_RCSID(0, "$NetBSD: nd6_rtr.c,v 1.120 2016/11/15 01:50:06 ozaki-r Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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@ -80,7 +80,7 @@ static void in6_init_address_ltimes(struct nd_prefix *,
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struct in6_addrlifetime *);
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static void purge_detached(struct ifnet *);
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static int rt6_deleteroute(struct rtentry *, void *);
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static int rt6_deleteroute_matcher(struct rtentry *, void *);
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extern int nd6_recalc_reachtm_interval;
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@ -2162,12 +2162,12 @@ rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
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return;
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}
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rt_walktree(AF_INET6, rt6_deleteroute, (void *)gateway);
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rt_delete_matched_entries(AF_INET6, rt6_deleteroute_matcher, gateway);
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splx(s);
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}
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static int
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rt6_deleteroute(struct rtentry *rt, void *arg)
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rt6_deleteroute_matcher(struct rtentry *rt, void *arg)
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{
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struct in6_addr *gate = (struct in6_addr *)arg;
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@ -2192,8 +2192,7 @@ rt6_deleteroute(struct rtentry *rt, void *arg)
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if ((rt->rt_flags & RTF_HOST) == 0)
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return (0);
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return (rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway,
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rt_mask(rt), rt->rt_flags, NULL));
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return 1;
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}
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int
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@ -1,4 +1,4 @@
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/* $NetBSD: nfs_boot.c,v 1.86 2016/07/07 06:55:43 msaitoh Exp $ */
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/* $NetBSD: nfs_boot.c,v 1.87 2016/11/15 01:50:06 ozaki-r Exp $ */
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/*-
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* Copyright (c) 1995, 1997 The NetBSD Foundation, Inc.
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@ -35,7 +35,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nfs_boot.c,v 1.86 2016/07/07 06:55:43 msaitoh Exp $");
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__KERNEL_RCSID(0, "$NetBSD: nfs_boot.c,v 1.87 2016/11/15 01:50:06 ozaki-r Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_nfs.h"
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@ -97,7 +97,7 @@ int nfs_boot_bootstatic = 1; /* BOOTSTATIC enabled (default) */
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static int md_mount(struct sockaddr_in *mdsin, char *path,
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struct nfs_args *argp, struct lwp *l);
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static int nfs_boot_delroute(struct rtentry *, void *);
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static int nfs_boot_delroute_matcher(struct rtentry *, void *);
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static void nfs_boot_defrt(struct in_addr *);
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static int nfs_boot_getfh(struct nfs_dlmount *ndm, struct lwp *);
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@ -559,26 +559,20 @@ nfs_boot_defrt(struct in_addr *gw_ip)
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}
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static int
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nfs_boot_delroute(struct rtentry *rt, void *w)
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nfs_boot_delroute_matcher(struct rtentry *rt, void *w)
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{
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int error;
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if ((void *)rt->rt_ifp != w)
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return 0;
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error = rtrequest(RTM_DELETE, rt_getkey(rt), NULL, rt_mask(rt), 0,
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NULL);
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if (error != 0)
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printf("%s: del route, error=%d\n", __func__, error);
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return 0;
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return 1;
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}
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void
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nfs_boot_flushrt(struct ifnet *ifp)
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{
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rt_walktree(AF_INET, nfs_boot_delroute, ifp);
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rt_delete_matched_entries(AF_INET, nfs_boot_delroute_matcher, ifp);
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}
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/*
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