/* * Copyright (c) 2000-2013 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright 1994, 1995 Massachusetts Institute of Technology * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby * granted, provided that both the above copyright notice and this * permission notice appear in all copies, that both the above * copyright notice and this permission notice appear in all * supporting documentation, and that the name of M.I.T. not be used * in advertising or publicity pertaining to distribution of the * software without specific, written prior permission. M.I.T. makes * no representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied * warranty. * * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ /* * This code does two things necessary for the enhanced TCP metrics to * function in a useful manner: * 1) It marks all non-host routes as `cloning', thus ensuring that * every actual reference to such a route actually gets turned * into a reference to a host route to the specific destination * requested. * 2) When such routes lose all their references, it arranges for them * to be deleted in some random collection of circumstances, so that * a large quantity of stale routing data is not kept in kernel memory * indefinitely. See in_rtqtimo() below for the exact mechanism. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern int tvtohz(struct timeval *); static int in_rtqtimo_run; /* in_rtqtimo is scheduled to run */ static void in_rtqtimo(void *); static void in_sched_rtqtimo(struct timeval *); static struct radix_node *in_addroute(void *, void *, struct radix_node_head *, struct radix_node *); static struct radix_node *in_deleteroute(void *, void *, struct radix_node_head *); static struct radix_node *in_matroute(void *, struct radix_node_head *); static struct radix_node *in_matroute_args(void *, struct radix_node_head *, rn_matchf_t *f, void *); static void in_clsroute(struct radix_node *, struct radix_node_head *); static int in_rtqkill(struct radix_node *, void *); static int in_ifadownkill(struct radix_node *, void *); #define RTPRF_OURS RTF_PROTO3 /* set on routes we manage */ /* * Do what we need to do when inserting a route. */ static struct radix_node * in_addroute(void *v_arg, void *n_arg, struct radix_node_head *head, struct radix_node *treenodes) { struct rtentry *rt = (struct rtentry *)treenodes; struct sockaddr_in *sin = (struct sockaddr_in *)(void *)rt_key(rt); struct radix_node *ret; char dbuf[MAX_IPv4_STR_LEN], gbuf[MAX_IPv4_STR_LEN]; uint32_t flags = rt->rt_flags; boolean_t verbose = (rt_verbose > 1); lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); RT_LOCK_ASSERT_HELD(rt); if (verbose) rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); /* * For IP, all unicast non-host routes are automatically cloning. */ if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) rt->rt_flags |= RTF_MULTICAST; if (!(rt->rt_flags & (RTF_HOST | RTF_CLONING | RTF_MULTICAST))) rt->rt_flags |= RTF_PRCLONING; /* * A little bit of help for both IP output and input: * For host routes, we make sure that RTF_BROADCAST * is set for anything that looks like a broadcast address. * This way, we can avoid an expensive call to in_broadcast() * in ip_output() most of the time (because the route passed * to ip_output() is almost always a host route). * * We also do the same for local addresses, with the thought * that this might one day be used to speed up ip_input(). * * We also mark routes to multicast addresses as such, because * it's easy to do and might be useful (but this is much more * dubious since it's so easy to inspect the address). (This * is done above.) */ if (rt->rt_flags & RTF_HOST) { if (in_broadcast(sin->sin_addr, rt->rt_ifp)) { rt->rt_flags |= RTF_BROADCAST; } else { /* Become a regular mutex */ RT_CONVERT_LOCK(rt); IFA_LOCK_SPIN(rt->rt_ifa); if (satosin(rt->rt_ifa->ifa_addr)->sin_addr.s_addr == sin->sin_addr.s_addr) rt->rt_flags |= RTF_LOCAL; IFA_UNLOCK(rt->rt_ifa); } } if (!rt->rt_rmx.rmx_mtu && !(rt->rt_rmx.rmx_locks & RTV_MTU) && rt->rt_ifp) rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; ret = rn_addroute(v_arg, n_arg, head, treenodes); if (ret == NULL && (rt->rt_flags & RTF_HOST)) { struct rtentry *rt2; /* * We are trying to add a host route, but can't. * Find out if it is because of an * ARP entry and delete it if so. */ rt2 = rtalloc1_scoped_locked(rt_key(rt), 0, RTF_CLONING | RTF_PRCLONING, sin_get_ifscope(rt_key(rt))); if (rt2 != NULL) { char dbufc[MAX_IPv4_STR_LEN]; RT_LOCK(rt2); if (verbose) rt_str(rt2, dbufc, sizeof (dbufc), NULL, 0); if ((rt2->rt_flags & RTF_LLINFO) && (rt2->rt_flags & RTF_HOST) && rt2->rt_gateway != NULL && rt2->rt_gateway->sa_family == AF_LINK) { if (verbose) { log(LOG_DEBUG, "%s: unable to insert " "route to %s;%s, flags=%b, due to " "existing ARP route %s->%s " "flags=%b, attempting to delete\n", __func__, dbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS, dbufc, (rt2->rt_ifp != NULL) ? rt2->rt_ifp->if_xname : "", rt2->rt_flags, RTF_BITS); } /* * Safe to drop rt_lock and use rt_key, * rt_gateway, since holding rnh_lock here * prevents another thread from calling * rt_setgate() on this route. */ RT_UNLOCK(rt2); (void) rtrequest_locked(RTM_DELETE, rt_key(rt2), rt2->rt_gateway, rt_mask(rt2), rt2->rt_flags, NULL); ret = rn_addroute(v_arg, n_arg, head, treenodes); } else { RT_UNLOCK(rt2); } rtfree_locked(rt2); } } if (!verbose) goto done; if (ret != NULL) { if (flags != rt->rt_flags) { log(LOG_DEBUG, "%s: route to %s->%s->%s inserted, " "oflags=%b, flags=%b\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", flags, RTF_BITS, rt->rt_flags, RTF_BITS); } else { log(LOG_DEBUG, "%s: route to %s->%s->%s inserted, " "flags=%b\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS); } } else { log(LOG_DEBUG, "%s: unable to insert route to %s->%s->%s, " "flags=%b, already exists\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS); } done: return (ret); } static struct radix_node * in_deleteroute(void *v_arg, void *netmask_arg, struct radix_node_head *head) { struct radix_node *rn; lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); rn = rn_delete(v_arg, netmask_arg, head); if (rt_verbose > 1 && rn != NULL) { char dbuf[MAX_IPv4_STR_LEN], gbuf[MAX_IPv4_STR_LEN]; struct rtentry *rt = (struct rtentry *)rn; RT_LOCK(rt); rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); log(LOG_DEBUG, "%s: route to %s->%s->%s deleted, " "flags=%b\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS); RT_UNLOCK(rt); } return (rn); } /* * Validate (unexpire) an expiring AF_INET route. */ struct radix_node * in_validate(struct radix_node *rn) { struct rtentry *rt = (struct rtentry *)rn; RT_LOCK_ASSERT_HELD(rt); /* This is first reference? */ if (rt->rt_refcnt == 0) { if (rt_verbose > 2) { char dbuf[MAX_IPv4_STR_LEN], gbuf[MAX_IPv4_STR_LEN]; rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); log(LOG_DEBUG, "%s: route to %s->%s->%s validated, " "flags=%b\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS); } /* * It's one of ours; unexpire it. If the timer is already * scheduled, let it run later as it won't re-arm itself * if there's nothing to do. */ if (rt->rt_flags & RTPRF_OURS) { rt->rt_flags &= ~RTPRF_OURS; rt_setexpire(rt, 0); } } return (rn); } /* * Similar to in_matroute_args except without the leaf-matching parameters. */ static struct radix_node * in_matroute(void *v_arg, struct radix_node_head *head) { return (in_matroute_args(v_arg, head, NULL, NULL)); } /* * This code is the inverse of in_clsroute: on first reference, if we * were managing the route, stop doing so and set the expiration timer * back off again. */ static struct radix_node * in_matroute_args(void *v_arg, struct radix_node_head *head, rn_matchf_t *f, void *w) { struct radix_node *rn = rn_match_args(v_arg, head, f, w); if (rn != NULL) { RT_LOCK_SPIN((struct rtentry *)rn); in_validate(rn); RT_UNLOCK((struct rtentry *)rn); } return (rn); } /* one hour is ``really old'' */ static uint32_t rtq_reallyold = 60*60; SYSCTL_UINT(_net_inet_ip, IPCTL_RTEXPIRE, rtexpire, CTLFLAG_RW | CTLFLAG_LOCKED, &rtq_reallyold, 0, "Default expiration time on dynamically learned routes"); /* never automatically crank down to less */ static uint32_t rtq_minreallyold = 10; SYSCTL_UINT(_net_inet_ip, IPCTL_RTMINEXPIRE, rtminexpire, CTLFLAG_RW | CTLFLAG_LOCKED, &rtq_minreallyold, 0, "Minimum time to attempt to hold onto dynamically learned routes"); /* 128 cached routes is ``too many'' */ static uint32_t rtq_toomany = 128; SYSCTL_UINT(_net_inet_ip, IPCTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW | CTLFLAG_LOCKED, &rtq_toomany, 0, "Upper limit on dynamically learned routes"); /* * On last reference drop, mark the route as belong to us so that it can be * timed out. */ static void in_clsroute(struct radix_node *rn, struct radix_node_head *head) { #pragma unused(head) char dbuf[MAX_IPv4_STR_LEN], gbuf[MAX_IPv4_STR_LEN]; struct rtentry *rt = (struct rtentry *)rn; boolean_t verbose = (rt_verbose > 1); lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); RT_LOCK_ASSERT_HELD(rt); if (!(rt->rt_flags & RTF_UP)) return; /* prophylactic measures */ if ((rt->rt_flags & (RTF_LLINFO | RTF_HOST)) != RTF_HOST) return; if (rt->rt_flags & RTPRF_OURS) return; if (!(rt->rt_flags & (RTF_WASCLONED | RTF_DYNAMIC))) return; if (verbose) rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); /* * Delete the route immediately if RTF_DELCLONE is set or * if route caching is disabled (rtq_reallyold set to 0). * Otherwise, let it expire and be deleted by in_rtqkill(). */ if ((rt->rt_flags & RTF_DELCLONE) || rtq_reallyold == 0) { int err; if (verbose) { log(LOG_DEBUG, "%s: deleting route to %s->%s->%s, " "flags=%b\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS); } /* * Delete the route from the radix tree but since we are * called when the route's reference count is 0, don't * deallocate it until we return from this routine by * telling rtrequest that we're interested in it. * Safe to drop rt_lock and use rt_key, rt_gateway since * holding rnh_lock here prevents another thread from * calling rt_setgate() on this route. */ RT_UNLOCK(rt); err = rtrequest_locked(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, &rt); if (err == 0) { /* Now let the caller free it */ RT_LOCK(rt); RT_REMREF_LOCKED(rt); } else { RT_LOCK(rt); if (!verbose) rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); log(LOG_ERR, "%s: error deleting route to " "%s->%s->%s, flags=%b, err=%d\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS, err); } } else { uint64_t timenow; timenow = net_uptime(); rt->rt_flags |= RTPRF_OURS; rt_setexpire(rt, timenow + rtq_reallyold); if (verbose) { log(LOG_DEBUG, "%s: route to %s->%s->%s invalidated, " "flags=%b, expire=T+%u\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS, rt->rt_expire - timenow); } /* We have at least one entry; arm the timer if not already */ in_sched_rtqtimo(NULL); } } struct rtqk_arg { struct radix_node_head *rnh; int updating; int draining; uint32_t killed; uint32_t found; uint64_t nextstop; }; /* * Get rid of old routes. When draining, this deletes everything, even when * the timeout is not expired yet. When updating, this makes sure that * nothing has a timeout longer than the current value of rtq_reallyold. */ static int in_rtqkill(struct radix_node *rn, void *rock) { struct rtqk_arg *ap = rock; struct rtentry *rt = (struct rtentry *)rn; boolean_t verbose = (rt_verbose > 1); uint64_t timenow; int err; timenow = net_uptime(); lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); RT_LOCK(rt); if (rt->rt_flags & RTPRF_OURS) { char dbuf[MAX_IPv4_STR_LEN], gbuf[MAX_IPv4_STR_LEN]; if (verbose) rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); ap->found++; VERIFY(rt->rt_expire == 0 || rt->rt_rmx.rmx_expire != 0); VERIFY(rt->rt_expire != 0 || rt->rt_rmx.rmx_expire == 0); if (ap->draining || rt->rt_expire <= timenow) { if (rt->rt_refcnt > 0) { panic("%s: route %p marked with RTPRF_OURS " "with non-zero refcnt (%u)", __func__, rt, rt->rt_refcnt); /* NOTREACHED */ } if (verbose) { log(LOG_DEBUG, "%s: deleting route to " "%s->%s->%s, flags=%b, draining=%d\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS, ap->draining); } RT_ADDREF_LOCKED(rt); /* for us to free below */ /* * Delete this route since we're done with it; * the route may be freed afterwards, so we * can no longer refer to 'rt' upon returning * from rtrequest(). Safe to drop rt_lock and * use rt_key, rt_gateway since holding rnh_lock * here prevents another thread from calling * rt_setgate() on this route. */ RT_UNLOCK(rt); err = rtrequest_locked(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); if (err != 0) { RT_LOCK(rt); if (!verbose) rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); log(LOG_ERR, "%s: error deleting route to " "%s->%s->%s, flags=%b, err=%d\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS, err); RT_UNLOCK(rt); } else { ap->killed++; } rtfree_locked(rt); } else { uint64_t expire = (rt->rt_expire - timenow); if (ap->updating && expire > rtq_reallyold) { rt_setexpire(rt, timenow + rtq_reallyold); if (verbose) { log(LOG_DEBUG, "%s: route to " "%s->%s->%s, flags=%b, adjusted " "expire=T+%u (was T+%u)\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS, (rt->rt_expire - timenow), expire); } } ap->nextstop = lmin(ap->nextstop, rt->rt_expire); RT_UNLOCK(rt); } } else { RT_UNLOCK(rt); } return (0); } #define RTQ_TIMEOUT 60*10 /* run no less than once every ten minutes */ static int rtq_timeout = RTQ_TIMEOUT; static void in_rtqtimo(void *targ) { #pragma unused(targ) struct radix_node_head *rnh; struct rtqk_arg arg; struct timeval atv; static uint64_t last_adjusted_timeout = 0; boolean_t verbose = (rt_verbose > 1); uint64_t timenow; uint32_t ours; lck_mtx_lock(rnh_lock); rnh = rt_tables[AF_INET]; VERIFY(rnh != NULL); /* Get the timestamp after we acquire the lock for better accuracy */ timenow = net_uptime(); if (verbose) { log(LOG_DEBUG, "%s: initial nextstop is T+%u seconds\n", __func__, rtq_timeout); } bzero(&arg, sizeof (arg)); arg.rnh = rnh; arg.nextstop = timenow + rtq_timeout; rnh->rnh_walktree(rnh, in_rtqkill, &arg); if (verbose) { log(LOG_DEBUG, "%s: found %u, killed %u\n", __func__, arg.found, arg.killed); } /* * Attempt to be somewhat dynamic about this: * If there are ``too many'' routes sitting around taking up space, * then crank down the timeout, and see if we can't make some more * go away. However, we make sure that we will never adjust more * than once in rtq_timeout seconds, to keep from cranking down too * hard. */ ours = (arg.found - arg.killed); if (ours > rtq_toomany && ((timenow - last_adjusted_timeout) >= (uint64_t)rtq_timeout) && rtq_reallyold > rtq_minreallyold) { rtq_reallyold = 2 * rtq_reallyold / 3; if (rtq_reallyold < rtq_minreallyold) rtq_reallyold = rtq_minreallyold; last_adjusted_timeout = timenow; if (verbose) { log(LOG_DEBUG, "%s: adjusted rtq_reallyold to %d " "seconds\n", __func__, rtq_reallyold); } arg.found = arg.killed = 0; arg.updating = 1; rnh->rnh_walktree(rnh, in_rtqkill, &arg); } atv.tv_usec = 0; atv.tv_sec = arg.nextstop - timenow; /* re-arm the timer only if there's work to do */ in_rtqtimo_run = 0; if (ours > 0) in_sched_rtqtimo(&atv); else if (verbose) log(LOG_DEBUG, "%s: not rescheduling timer\n", __func__); lck_mtx_unlock(rnh_lock); } static void in_sched_rtqtimo(struct timeval *atv) { lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); if (!in_rtqtimo_run) { struct timeval tv; if (atv == NULL) { tv.tv_usec = 0; tv.tv_sec = MAX(rtq_timeout / 10, 1); atv = &tv; } if (rt_verbose > 1) { log(LOG_DEBUG, "%s: timer scheduled in " "T+%llus.%lluu\n", __func__, (uint64_t)atv->tv_sec, (uint64_t)atv->tv_usec); } in_rtqtimo_run = 1; timeout(in_rtqtimo, NULL, tvtohz(atv)); } } void in_rtqdrain(void) { struct radix_node_head *rnh; struct rtqk_arg arg; if (rt_verbose > 1) log(LOG_DEBUG, "%s: draining routes\n", __func__); lck_mtx_lock(rnh_lock); rnh = rt_tables[AF_INET]; VERIFY(rnh != NULL); bzero(&arg, sizeof (arg)); arg.rnh = rnh; arg.draining = 1; rnh->rnh_walktree(rnh, in_rtqkill, &arg); lck_mtx_unlock(rnh_lock); } /* * Initialize our routing tree. */ int in_inithead(void **head, int off) { struct radix_node_head *rnh; /* If called from route_init(), make sure it is exactly once */ VERIFY(head != (void **)&rt_tables[AF_INET] || *head == NULL); if (!rn_inithead(head, off)) return (0); /* * We can get here from nfs_subs.c as well, in which case this * won't be for the real routing table and thus we're done; * this also takes care of the case when we're called more than * once from anywhere but route_init(). */ if (head != (void **)&rt_tables[AF_INET]) return (1); /* only do this for the real routing table */ rnh = *head; rnh->rnh_addaddr = in_addroute; rnh->rnh_deladdr = in_deleteroute; rnh->rnh_matchaddr = in_matroute; rnh->rnh_matchaddr_args = in_matroute_args; rnh->rnh_close = in_clsroute; return (1); } /* * This zaps old routes when the interface goes down or interface * address is deleted. In the latter case, it deletes static routes * that point to this address. If we don't do this, we may end up * using the old address in the future. The ones we always want to * get rid of are things like ARP entries, since the user might down * the interface, walk over to a completely different network, and * plug back in. */ struct in_ifadown_arg { struct radix_node_head *rnh; struct ifaddr *ifa; int del; }; static int in_ifadownkill(struct radix_node *rn, void *xap) { char dbuf[MAX_IPv4_STR_LEN], gbuf[MAX_IPv4_STR_LEN]; struct in_ifadown_arg *ap = xap; struct rtentry *rt = (struct rtentry *)rn; boolean_t verbose = (rt_verbose != 0); int err; lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); RT_LOCK(rt); if (rt->rt_ifa == ap->ifa && (ap->del || !(rt->rt_flags & RTF_STATIC))) { rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); if (verbose) { log(LOG_DEBUG, "%s: deleting route to %s->%s->%s, " "flags=%b\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS); } RT_ADDREF_LOCKED(rt); /* for us to free below */ /* * We need to disable the automatic prune that happens * in this case in rtrequest() because it will blow * away the pointers that rn_walktree() needs in order * continue our descent. We will end up deleting all * the routes that rtrequest() would have in any case, * so that behavior is not needed there. Safe to drop * rt_lock and use rt_key, rt_gateway, since holding * rnh_lock here prevents another thread from calling * rt_setgate() on this route. */ rt->rt_flags &= ~(RTF_CLONING | RTF_PRCLONING); RT_UNLOCK(rt); err = rtrequest_locked(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); if (err != 0) { RT_LOCK(rt); if (!verbose) rt_str(rt, dbuf, sizeof (dbuf), gbuf, sizeof (gbuf)); log(LOG_ERR, "%s: error deleting route to " "%s->%s->%s, flags=%b, err=%d\n", __func__, dbuf, gbuf, (rt->rt_ifp != NULL) ? rt->rt_ifp->if_xname : "", rt->rt_flags, RTF_BITS, err); RT_UNLOCK(rt); } rtfree_locked(rt); } else { RT_UNLOCK(rt); } return (0); } int in_ifadown(struct ifaddr *ifa, int delete) { struct in_ifadown_arg arg; struct radix_node_head *rnh; lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); /* * Holding rnh_lock here prevents the possibility of * ifa from changing (e.g. in_ifinit), so it is safe * to access its ifa_addr without locking. */ if (ifa->ifa_addr->sa_family != AF_INET) return (1); /* trigger route cache reevaluation */ routegenid_inet_update(); arg.rnh = rnh = rt_tables[AF_INET]; arg.ifa = ifa; arg.del = delete; rnh->rnh_walktree(rnh, in_ifadownkill, &arg); IFA_LOCK_SPIN(ifa); ifa->ifa_flags &= ~IFA_ROUTE; IFA_UNLOCK(ifa); return (0); }