- convert radix node head lock from mutex to rwlock
- make radix node head lock not recursive - fix LOR in rtexpunge - fix LOR in rtredirect Reviewed by: sam
This commit is contained in:
parent
5e5391084a
commit
3120b9d428
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=185747
@ -43,6 +43,8 @@ __FBSDID("$FreeBSD$");
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#include <sys/socket.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#ifdef __FreeBSD__
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#include <sys/malloc.h>
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#endif
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@ -505,7 +505,7 @@ static struct witness_order_list_entry order_lists[] = {
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* Routing
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*/
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{ "so_rcv", &lock_class_mtx_sleep },
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{ "radix node head", &lock_class_mtx_sleep },
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{ "radix node head", &lock_class_rw },
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{ "rtentry", &lock_class_mtx_sleep },
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{ "ifaddr", &lock_class_mtx_sleep },
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{ NULL, NULL },
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@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/mbuf.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <sys/refcount.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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@ -425,10 +426,10 @@ vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
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saddr = nam;
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rnh = nep->ne_rtable[saddr->sa_family];
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if (rnh != NULL) {
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RADIX_NODE_HEAD_LOCK(rnh);
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RADIX_NODE_HEAD_RLOCK(rnh);
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np = (struct netcred *)
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(*rnh->rnh_matchaddr)(saddr, rnh);
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RADIX_NODE_HEAD_UNLOCK(rnh);
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RADIX_NODE_HEAD_RUNLOCK(rnh);
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if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
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np = NULL;
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}
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@ -38,6 +38,7 @@
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#ifdef _KERNEL
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/domain.h>
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@ -36,6 +36,7 @@
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#ifdef _KERNEL
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/_rwlock.h>
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#endif
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#ifdef MALLOC_DECLARE
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@ -132,7 +133,7 @@ struct radix_node_head {
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struct radix_node rnh_nodes[3]; /* empty tree for common case */
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int rnh_multipath; /* multipath capable ? */
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#ifdef _KERNEL
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struct mtx rnh_mtx; /* locks entire radix tree */
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struct rwlock rnh_lock; /* locks entire radix tree */
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#endif
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};
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@ -146,11 +147,17 @@ struct radix_node_head {
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#define Free(p) free((caddr_t)p, M_RTABLE);
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#define RADIX_NODE_HEAD_LOCK_INIT(rnh) \
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mtx_init(&(rnh)->rnh_mtx, "radix node head", NULL, MTX_DEF | MTX_RECURSE)
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#define RADIX_NODE_HEAD_LOCK(rnh) mtx_lock(&(rnh)->rnh_mtx)
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#define RADIX_NODE_HEAD_UNLOCK(rnh) mtx_unlock(&(rnh)->rnh_mtx)
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#define RADIX_NODE_HEAD_DESTROY(rnh) mtx_destroy(&(rnh)->rnh_mtx)
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#define RADIX_NODE_HEAD_LOCK_ASSERT(rnh) mtx_assert(&(rnh)->rnh_mtx, MA_OWNED)
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rw_init_flags(&(rnh)->rnh_lock, "radix node head", 0)
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#define RADIX_NODE_HEAD_LOCK(rnh) rw_wlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_UNLOCK(rnh) rw_wunlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_RLOCK(rnh) rw_rlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_RUNLOCK(rnh) rw_runlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_LOCK_TRY_UPGRADE(rnh) rw_try_upgrade(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_DESTROY(rnh) rw_destroy(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_LOCK_ASSERT(rnh) rw_assert(&(rnh)->rnh_lock, RA_LOCKED)
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#define RADIX_NODE_HEAD_WLOCK_ASSERT(rnh) rw_assert(&(rnh)->rnh_lock, RA_WLOCKED)
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#endif /* _KERNEL */
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void rn_init(void);
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168
sys/net/route.c
168
sys/net/route.c
@ -45,6 +45,7 @@
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/sysproto.h>
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#include <sys/proc.h>
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#include <sys/domain.h>
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@ -269,7 +270,8 @@ rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags,
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struct rtentry *newrt;
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struct rt_addrinfo info;
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u_long nflags;
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int err = 0, msgtype = RTM_MISS;
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int needresolve = 0, err = 0, msgtype = RTM_MISS;
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int needlock;
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KASSERT((fibnum < rt_numfibs), ("rtalloc1_fib: bad fibnum"));
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if (dst->sa_family != AF_INET) /* Only INET supports > 1 fib now */
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@ -283,59 +285,92 @@ rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags,
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V_rtstat.rts_unreach++;
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goto miss2;
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}
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RADIX_NODE_HEAD_LOCK(rnh);
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if ((rn = rnh->rnh_matchaddr(dst, rnh)) &&
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(rn->rn_flags & RNF_ROOT) == 0) {
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/*
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* If we find it and it's not the root node, then
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* get a reference on the rtentry associated.
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*/
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needlock = !(ignflags & RTF_RNH_LOCKED);
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retry:
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if (needlock)
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RADIX_NODE_HEAD_RLOCK(rnh);
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#ifdef INVARIANTS
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else
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RADIX_NODE_HEAD_LOCK_ASSERT(rnh);
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#endif
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rn = rnh->rnh_matchaddr(dst, rnh);
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if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) {
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newrt = rt = RNTORT(rn);
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nflags = rt->rt_flags & ~ignflags;
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if (report && (nflags & RTF_CLONING)) {
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/*
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* We are apparently adding (report = 0 in delete).
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* If it requires that it be cloned, do so.
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* (This implies it wasn't a HOST route.)
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*/
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err = rtrequest_fib(RTM_RESOLVE, dst, NULL,
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NULL, 0, &newrt, fibnum);
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if (err) {
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if (needlock && !RADIX_NODE_HEAD_LOCK_TRY_UPGRADE(rnh)) {
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RADIX_NODE_HEAD_RUNLOCK(rnh);
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RADIX_NODE_HEAD_LOCK(rnh);
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/*
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* If the cloning didn't succeed, maybe
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* what we have will do. Return that.
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* lookup again to make sure it wasn't changed
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*/
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newrt = rt; /* existing route */
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RT_LOCK(newrt);
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RT_ADDREF(newrt);
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goto miss;
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rn = rnh->rnh_matchaddr(dst, rnh);
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if (!(rn && ((rn->rn_flags & RNF_ROOT) == 0))) {
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RADIX_NODE_HEAD_UNLOCK(rnh);
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needresolve = 0;
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log(LOG_INFO, "retrying route lookup ...\n");
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goto retry;
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}
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}
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KASSERT(newrt, ("no route and no error"));
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RT_LOCK(newrt);
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if (newrt->rt_flags & RTF_XRESOLVE) {
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/*
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* If the new route specifies it be
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* externally resolved, then go do that.
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*/
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msgtype = RTM_RESOLVE;
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goto miss;
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}
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/* Inform listeners of the new route. */
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bzero(&info, sizeof(info));
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info.rti_info[RTAX_DST] = rt_key(newrt);
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info.rti_info[RTAX_NETMASK] = rt_mask(newrt);
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info.rti_info[RTAX_GATEWAY] = newrt->rt_gateway;
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if (newrt->rt_ifp != NULL) {
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info.rti_info[RTAX_IFP] =
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newrt->rt_ifp->if_addr->ifa_addr;
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info.rti_info[RTAX_IFA] = newrt->rt_ifa->ifa_addr;
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}
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rt_missmsg(RTM_ADD, &info, newrt->rt_flags, 0);
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needresolve = 1;
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} else {
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RT_LOCK(newrt);
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RT_ADDREF(newrt);
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if (needlock)
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RADIX_NODE_HEAD_RUNLOCK(rnh);
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goto done;
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}
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RADIX_NODE_HEAD_UNLOCK(rnh);
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}
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/*
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* if needresolve is set then we have the exclusive lock
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* and we need to keep it held for the benefit of rtrequest_fib
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*/
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if (!needresolve && needlock)
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RADIX_NODE_HEAD_RUNLOCK(rnh);
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if (needresolve) {
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RADIX_NODE_HEAD_WLOCK_ASSERT(rnh);
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/*
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* We are apparently adding (report = 0 in delete).
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* If it requires that it be cloned, do so.
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* (This implies it wasn't a HOST route.)
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*/
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err = rtrequest_fib(RTM_RESOLVE, dst, NULL,
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NULL, RTF_RNH_LOCKED, &newrt, fibnum);
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if (err) {
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/*
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* If the cloning didn't succeed, maybe
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* what we have will do. Return that.
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*/
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newrt = rt; /* existing route */
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RT_LOCK(newrt);
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RT_ADDREF(newrt);
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goto miss;
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}
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KASSERT(newrt, ("no route and no error"));
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RT_LOCK(newrt);
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if (newrt->rt_flags & RTF_XRESOLVE) {
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/*
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* If the new route specifies it be
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* externally resolved, then go do that.
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*/
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msgtype = RTM_RESOLVE;
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goto miss;
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}
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/* Inform listeners of the new route. */
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bzero(&info, sizeof(info));
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info.rti_info[RTAX_DST] = rt_key(newrt);
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info.rti_info[RTAX_NETMASK] = rt_mask(newrt);
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info.rti_info[RTAX_GATEWAY] = newrt->rt_gateway;
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if (newrt->rt_ifp != NULL) {
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info.rti_info[RTAX_IFP] =
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newrt->rt_ifp->if_addr->ifa_addr;
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info.rti_info[RTAX_IFA] = newrt->rt_ifa->ifa_addr;
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}
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rt_missmsg(RTM_ADD, &info, newrt->rt_flags, 0);
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if (needlock)
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RADIX_NODE_HEAD_UNLOCK(rnh);
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} else {
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/*
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* Either we hit the root or couldn't find any match,
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@ -344,7 +379,8 @@ rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags,
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*/
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V_rtstat.rts_unreach++;
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miss:
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RADIX_NODE_HEAD_UNLOCK(rnh);
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if (needlock && needresolve)
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RADIX_NODE_HEAD_UNLOCK(rnh);
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miss2: if (report) {
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/*
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* If required, report the failure to the supervising
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@ -356,6 +392,7 @@ rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags,
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rt_missmsg(msgtype, &info, 0, err);
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}
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}
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done:
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if (newrt)
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RT_LOCK_ASSERT(newrt);
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return (newrt);
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@ -475,6 +512,8 @@ rtredirect_fib(struct sockaddr *dst,
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short *stat = NULL;
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struct rt_addrinfo info;
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struct ifaddr *ifa;
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struct radix_node_head *rnh =
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V_rt_tables[rt->rt_fibnum][dst->sa_family];
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/* verify the gateway is directly reachable */
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if ((ifa = ifa_ifwithnet(gateway)) == NULL) {
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@ -524,14 +563,17 @@ rtredirect_fib(struct sockaddr *dst,
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info.rti_info[RTAX_NETMASK] = netmask;
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info.rti_ifa = ifa;
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info.rti_flags = flags;
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if (rt0 != NULL)
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RT_UNLOCK(rt0); /* drop lock to avoid LOR with RNH */
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error = rtrequest1_fib(RTM_ADD, &info, &rt, fibnum);
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if (rt != NULL) {
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RT_LOCK(rt);
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EVENTHANDLER_INVOKE(route_redirect_event, rt0, rt, dst);
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if (rt0 != NULL)
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EVENTHANDLER_INVOKE(route_redirect_event, rt0, rt, dst);
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flags = rt->rt_flags;
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}
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if (rt0)
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RTFREE_LOCKED(rt0);
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if (rt0 != NULL)
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RTFREE(rt0);
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stat = &V_rtstat.rts_dynamic;
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} else {
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@ -547,8 +589,12 @@ rtredirect_fib(struct sockaddr *dst,
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/*
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* add the key and gateway (in one malloc'd chunk).
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*/
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RT_UNLOCK(rt);
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RADIX_NODE_HEAD_LOCK(rnh);
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RT_LOCK(rt);
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rt_setgate(rt, rt_key(rt), gateway);
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gwrt = rtalloc1(gateway, 1, 0);
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gwrt = rtalloc1(gateway, 1, RTF_RNH_LOCKED);
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RADIX_NODE_HEAD_UNLOCK(rnh);
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EVENTHANDLER_INVOKE(route_redirect_event, rt, gwrt, dst);
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RTFREE_LOCKED(gwrt);
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}
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@ -782,7 +828,9 @@ rtexpunge(struct rtentry *rt)
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struct ifaddr *ifa;
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int error = 0;
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rnh = V_rt_tables[rt->rt_fibnum][rt_key(rt)->sa_family];
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RT_LOCK_ASSERT(rt);
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RADIX_NODE_HEAD_LOCK_ASSERT(rnh);
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#if 0
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/*
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* We cannot assume anything about the reference count
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@ -798,8 +846,6 @@ rtexpunge(struct rtentry *rt)
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if (rnh == NULL)
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return (EAFNOSUPPORT);
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RADIX_NODE_HEAD_LOCK(rnh);
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/*
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* Remove the item from the tree; it should be there,
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* but when callers invoke us blindly it may not (sigh).
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@ -854,7 +900,6 @@ rtexpunge(struct rtentry *rt)
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*/
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V_rttrash++;
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bad:
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RADIX_NODE_HEAD_UNLOCK(rnh);
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return (error);
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}
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@ -869,7 +914,7 @@ rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
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u_int fibnum)
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{
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INIT_VNET_NET(curvnet);
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int error = 0;
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int error = 0, needlock = 0;
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register struct rtentry *rt;
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register struct radix_node *rn;
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register struct radix_node_head *rnh;
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@ -886,7 +931,10 @@ rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
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rnh = V_rt_tables[fibnum][dst->sa_family];
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if (rnh == NULL)
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return (EAFNOSUPPORT);
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RADIX_NODE_HEAD_LOCK(rnh);
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needlock = ((flags & RTF_RNH_LOCKED) == 0);
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flags &= ~RTF_RNH_LOCKED;
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if (needlock)
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RADIX_NODE_HEAD_LOCK(rnh);
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/*
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* If we are adding a host route then we don't want to put
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* a netmask in the tree, nor do we want to clone it.
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@ -1200,7 +1248,8 @@ rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
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error = EOPNOTSUPP;
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}
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bad:
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RADIX_NODE_HEAD_UNLOCK(rnh);
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if (needlock)
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RADIX_NODE_HEAD_UNLOCK(rnh);
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return (error);
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#undef senderr
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}
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@ -1307,7 +1356,8 @@ rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate)
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again:
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RT_LOCK_ASSERT(rt);
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RADIX_NODE_HEAD_LOCK_ASSERT(rnh);
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/*
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* A host route with the destination equal to the gateway
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* will interfere with keeping LLINFO in the routing
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@ -1333,7 +1383,7 @@ rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate)
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struct rtentry *gwrt;
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RT_UNLOCK(rt); /* XXX workaround LOR */
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gwrt = rtalloc1_fib(gate, 1, 0, rt->rt_fibnum);
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gwrt = rtalloc1_fib(gate, 1, RTF_RNH_LOCKED, rt->rt_fibnum);
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if (gwrt == rt) {
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RT_REMREF(rt);
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return (EADDRINUSE); /* failure */
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@ -1404,12 +1454,8 @@ rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate)
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arg.rnh = rnh;
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arg.rt0 = rt;
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RT_UNLOCK(rt); /* XXX workaround LOR */
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RADIX_NODE_HEAD_LOCK(rnh);
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RT_LOCK(rt);
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rnh->rnh_walktree_from(rnh, rt_key(rt), rt_mask(rt),
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rt_fixchange, &arg);
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RADIX_NODE_HEAD_UNLOCK(rnh);
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}
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return 0;
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@ -196,6 +196,7 @@ struct ortentry {
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#define RTF_BROADCAST 0x400000 /* route represents a bcast address */
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#define RTF_MULTICAST 0x800000 /* route represents a mcast address */
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/* 0x1000000 and up unassigned */
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#define RTF_RNH_LOCKED 0x40000000 /* radix node head locked by caller */
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/* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */
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#define RTF_FMASK \
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|
@ -43,6 +43,7 @@
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/rwlock.h>
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#include <sys/signalvar.h>
|
||||
#include <sys/socket.h>
|
||||
#include <sys/socketvar.h>
|
||||
@ -554,11 +555,11 @@ route_output(struct mbuf *m, struct socket *so)
|
||||
rnh = V_rt_tables[so->so_fibnum][info.rti_info[RTAX_DST]->sa_family];
|
||||
if (rnh == NULL)
|
||||
senderr(EAFNOSUPPORT);
|
||||
RADIX_NODE_HEAD_LOCK(rnh);
|
||||
RADIX_NODE_HEAD_RLOCK(rnh);
|
||||
rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST],
|
||||
info.rti_info[RTAX_NETMASK], rnh);
|
||||
if (rt == NULL) { /* XXX looks bogus */
|
||||
RADIX_NODE_HEAD_UNLOCK(rnh);
|
||||
RADIX_NODE_HEAD_RUNLOCK(rnh);
|
||||
senderr(ESRCH);
|
||||
}
|
||||
#ifdef RADIX_MPATH
|
||||
@ -574,14 +575,14 @@ route_output(struct mbuf *m, struct socket *so)
|
||||
(rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
|
||||
rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
|
||||
if (!rt) {
|
||||
RADIX_NODE_HEAD_UNLOCK(rnh);
|
||||
RADIX_NODE_HEAD_RUNLOCK(rnh);
|
||||
senderr(ESRCH);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
RT_LOCK(rt);
|
||||
RT_ADDREF(rt);
|
||||
RADIX_NODE_HEAD_UNLOCK(rnh);
|
||||
RADIX_NODE_HEAD_RUNLOCK(rnh);
|
||||
|
||||
/*
|
||||
* Fix for PR: 82974
|
||||
|
@ -83,6 +83,7 @@ __FBSDID("$FreeBSD$");
|
||||
#include <sys/socket.h>
|
||||
#include <sys/socketvar.h>
|
||||
#include <sys/mbuf.h>
|
||||
#include <sys/rwlock.h>
|
||||
#include <sys/syslog.h>
|
||||
#include <sys/callout.h>
|
||||
#include <sys/vimage.h>
|
||||
|
@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
|
||||
#include <sys/time.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/errno.h>
|
||||
#include <sys/rwlock.h>
|
||||
#include <sys/syslog.h>
|
||||
#include <sys/queue.h>
|
||||
#include <sys/vimage.h>
|
||||
|
Loading…
Reference in New Issue
Block a user