in6_rmx.c revision 213225
1139826Simp/*- 253541Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 353541Sshin * All rights reserved. 453541Sshin * 553541Sshin * Redistribution and use in source and binary forms, with or without 653541Sshin * modification, are permitted provided that the following conditions 753541Sshin * are met: 853541Sshin * 1. Redistributions of source code must retain the above copyright 953541Sshin * notice, this list of conditions and the following disclaimer. 1053541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1153541Sshin * notice, this list of conditions and the following disclaimer in the 1253541Sshin * documentation and/or other materials provided with the distribution. 1353541Sshin * 3. Neither the name of the project nor the names of its contributors 1453541Sshin * may be used to endorse or promote products derived from this software 1553541Sshin * without specific prior written permission. 1653541Sshin * 1753541Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1853541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1953541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2053541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2153541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2253541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2353541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2453541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2553541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2653541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2753541Sshin * SUCH DAMAGE. 28174510Sobrien * 29174510Sobrien * $KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $ 3053541Sshin */ 3153541Sshin 32139826Simp/*- 3353541Sshin * Copyright 1994, 1995 Massachusetts Institute of Technology 3453541Sshin * 3553541Sshin * Permission to use, copy, modify, and distribute this software and 3653541Sshin * its documentation for any purpose and without fee is hereby 3753541Sshin * granted, provided that both the above copyright notice and this 3853541Sshin * permission notice appear in all copies, that both the above 3953541Sshin * copyright notice and this permission notice appear in all 4053541Sshin * supporting documentation, and that the name of M.I.T. not be used 4153541Sshin * in advertising or publicity pertaining to distribution of the 4253541Sshin * software without specific, written prior permission. M.I.T. makes 4353541Sshin * no representations about the suitability of this software for any 4453541Sshin * purpose. It is provided "as is" without express or implied 4553541Sshin * warranty. 4653541Sshin * 4753541Sshin * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 4853541Sshin * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 4953541Sshin * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 5053541Sshin * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 5153541Sshin * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 5253541Sshin * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 5353541Sshin * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 5453541Sshin * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 5553541Sshin * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 5653541Sshin * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 5753541Sshin * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5853541Sshin * SUCH DAMAGE. 5953541Sshin * 6053541Sshin */ 6153541Sshin 6253541Sshin/* 6353541Sshin * This code does two things necessary for the enhanced TCP metrics to 6453541Sshin * function in a useful manner: 6553541Sshin * 1) It marks all non-host routes as `cloning', thus ensuring that 6653541Sshin * every actual reference to such a route actually gets turned 6753541Sshin * into a reference to a host route to the specific destination 6853541Sshin * requested. 6953541Sshin * 2) When such routes lose all their references, it arranges for them 7053541Sshin * to be deleted in some random collection of circumstances, so that 7153541Sshin * a large quantity of stale routing data is not kept in kernel memory 7253541Sshin * indefinitely. See in6_rtqtimo() below for the exact mechanism. 7353541Sshin */ 7453541Sshin 75174510Sobrien#include <sys/cdefs.h> 76174510Sobrien__FBSDID("$FreeBSD: head/sys/netinet6/in6_rmx.c 213225 2010-09-27 19:26:56Z delphij $"); 77174510Sobrien 7853541Sshin#include <sys/param.h> 7953541Sshin#include <sys/systm.h> 8053541Sshin#include <sys/kernel.h> 81185751Simp#include <sys/lock.h> 8253541Sshin#include <sys/sysctl.h> 8353541Sshin#include <sys/queue.h> 8453541Sshin#include <sys/socket.h> 8553541Sshin#include <sys/socketvar.h> 8653541Sshin#include <sys/mbuf.h> 87185747Skmacy#include <sys/rwlock.h> 8853541Sshin#include <sys/syslog.h> 89120727Ssam#include <sys/callout.h> 9053541Sshin 9153541Sshin#include <net/if.h> 92194714Sbz#include <net/route.h> 93185571Sbz 9453541Sshin#include <netinet/in.h> 9553541Sshin#include <netinet/ip_var.h> 9653541Sshin#include <netinet/in_var.h> 9753541Sshin 9862587Sitojun#include <netinet/ip6.h> 9953541Sshin#include <netinet6/ip6_var.h> 10053541Sshin 10162587Sitojun#include <netinet/icmp6.h> 102121283Sume#include <netinet6/nd6.h> 10353541Sshin 10453541Sshin#include <netinet/tcp.h> 10553541Sshin#include <netinet/tcp_seq.h> 10653541Sshin#include <netinet/tcp_timer.h> 10753541Sshin#include <netinet/tcp_var.h> 10853541Sshin 109175162Sobrienextern int in6_inithead(void **head, int off); 110193731Szec#ifdef VIMAGE 111193731Szecextern int in6_detachhead(void **head, int off); 112193731Szec#endif 11353541Sshin 11462587Sitojun#define RTPRF_OURS RTF_PROTO3 /* set on routes we manage */ 11553541Sshin 11653541Sshin/* 11753541Sshin * Do what we need to do when inserting a route. 11853541Sshin */ 11953541Sshinstatic struct radix_node * 12053541Sshinin6_addroute(void *v_arg, void *n_arg, struct radix_node_head *head, 121171260Sdelphij struct radix_node *treenodes) 12253541Sshin{ 12353541Sshin struct rtentry *rt = (struct rtentry *)treenodes; 12453541Sshin struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt); 12553541Sshin struct radix_node *ret; 12653541Sshin 127186119Sqingli RADIX_NODE_HEAD_WLOCK_ASSERT(head); 12853541Sshin if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 12953541Sshin rt->rt_flags |= RTF_MULTICAST; 13053541Sshin 13153541Sshin /* 13253541Sshin * A little bit of help for both IPv6 output and input: 13353541Sshin * For local addresses, we make sure that RTF_LOCAL is set, 13453541Sshin * with the thought that this might one day be used to speed up 13553541Sshin * ip_input(). 13653541Sshin * 13753541Sshin * We also mark routes to multicast addresses as such, because 13853541Sshin * it's easy to do and might be useful (but this is much more 13953541Sshin * dubious since it's so easy to inspect the address). (This 14053541Sshin * is done above.) 14153541Sshin * 14253541Sshin * XXX 14353541Sshin * should elaborate the code. 14453541Sshin */ 14553541Sshin if (rt->rt_flags & RTF_HOST) { 14653541Sshin if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr) 14753541Sshin ->sin6_addr, 14853541Sshin &sin6->sin6_addr)) { 14953541Sshin rt->rt_flags |= RTF_LOCAL; 15053541Sshin } 15153541Sshin } 15253541Sshin 153122922Sandre if (!rt->rt_rmx.rmx_mtu && rt->rt_ifp) 154121283Sume rt->rt_rmx.rmx_mtu = IN6_LINKMTU(rt->rt_ifp); 15553541Sshin 15653541Sshin ret = rn_addroute(v_arg, n_arg, head, treenodes); 157186119Sqingli if (ret == NULL) { 15853541Sshin struct rtentry *rt2; 15953541Sshin /* 16053541Sshin * We are trying to add a net route, but can't. 16153541Sshin * The following case should be allowed, so we'll make a 16253541Sshin * special check for this: 16353541Sshin * Two IPv6 addresses with the same prefix is assigned 16453541Sshin * to a single interrface. 16553541Sshin * # ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1) 16653541Sshin * # ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2) 16753541Sshin * In this case, (*1) and (*2) want to add the same 16853541Sshin * net route entry, 3ffe:0501:: -> if0. 16953541Sshin * This case should not raise an error. 17053541Sshin */ 171186119Sqingli rt2 = rtalloc1((struct sockaddr *)sin6, 0, RTF_RNH_LOCKED); 17253541Sshin if (rt2) { 173186119Sqingli if (((rt2->rt_flags & (RTF_HOST|RTF_GATEWAY)) == 0) 17453541Sshin && rt2->rt_gateway 17553541Sshin && rt2->rt_gateway->sa_family == AF_LINK 17653541Sshin && rt2->rt_ifp == rt->rt_ifp) { 17753541Sshin ret = rt2->rt_nodes; 17853541Sshin } 179120727Ssam RTFREE_LOCKED(rt2); 18053541Sshin } 18153541Sshin } 182186119Sqingli return (ret); 18353541Sshin} 18453541Sshin 18553541Sshin/* 18653541Sshin * This code is the inverse of in6_clsroute: on first reference, if we 18753541Sshin * were managing the route, stop doing so and set the expiration timer 18853541Sshin * back off again. 18953541Sshin */ 19053541Sshinstatic struct radix_node * 19153541Sshinin6_matroute(void *v_arg, struct radix_node_head *head) 19253541Sshin{ 19353541Sshin struct radix_node *rn = rn_match(v_arg, head); 19453541Sshin struct rtentry *rt = (struct rtentry *)rn; 19553541Sshin 196213225Sdelphij if (rt) { 197213225Sdelphij RT_LOCK(rt); 19853541Sshin if (rt->rt_flags & RTPRF_OURS) { 19953541Sshin rt->rt_flags &= ~RTPRF_OURS; 20053541Sshin rt->rt_rmx.rmx_expire = 0; 20153541Sshin } 202213225Sdelphij RT_UNLOCK(rt); 20353541Sshin } 20453541Sshin return rn; 20553541Sshin} 20653541Sshin 20762604SitojunSYSCTL_DECL(_net_inet6_ip6); 20862604Sitojun 209207369Sbzstatic VNET_DEFINE(int, rtq_reallyold6) = 60*60; 210207369Sbz /* one hour is ``really old'' */ 211195727Srwatson#define V_rtq_reallyold6 VNET(rtq_reallyold6) 212195699SrwatsonSYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTEXPIRE, rtexpire, CTLFLAG_RW, 213195699Srwatson &VNET_NAME(rtq_reallyold6) , 0, ""); 214120913Sume 215207369Sbzstatic VNET_DEFINE(int, rtq_minreallyold6) = 10; 216207369Sbz /* never automatically crank down to less */ 217207369Sbz#define V_rtq_minreallyold6 VNET(rtq_minreallyold6) 218195699SrwatsonSYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTMINEXPIRE, rtminexpire, CTLFLAG_RW, 219195699Srwatson &VNET_NAME(rtq_minreallyold6) , 0, ""); 22053541Sshin 221207369Sbzstatic VNET_DEFINE(int, rtq_toomany6) = 128; 222207369Sbz /* 128 cached routes is ``too many'' */ 223207369Sbz#define V_rtq_toomany6 VNET(rtq_toomany6) 224195699SrwatsonSYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW, 225195699Srwatson &VNET_NAME(rtq_toomany6) , 0, ""); 226120913Sume 22753541Sshinstruct rtqk_arg { 22853541Sshin struct radix_node_head *rnh; 22953541Sshin int mode; 23053541Sshin int updating; 23153541Sshin int draining; 23253541Sshin int killed; 23353541Sshin int found; 23453541Sshin time_t nextstop; 23553541Sshin}; 23653541Sshin 23753541Sshin/* 23853541Sshin * Get rid of old routes. When draining, this deletes everything, even when 23953541Sshin * the timeout is not expired yet. When updating, this makes sure that 240181832Sbz * nothing has a timeout longer than the current value of rtq_reallyold6. 24153541Sshin */ 24253541Sshinstatic int 24353541Sshinin6_rtqkill(struct radix_node *rn, void *rock) 24453541Sshin{ 24553541Sshin struct rtqk_arg *ap = rock; 24653541Sshin struct rtentry *rt = (struct rtentry *)rn; 24753541Sshin int err; 24853541Sshin 249188963Srwatson RADIX_NODE_HEAD_WLOCK_ASSERT(ap->rnh); 250188963Srwatson 25153541Sshin if (rt->rt_flags & RTPRF_OURS) { 25253541Sshin ap->found++; 25353541Sshin 254150351Sandre if (ap->draining || rt->rt_rmx.rmx_expire <= time_uptime) { 25553541Sshin if (rt->rt_refcnt > 0) 25653541Sshin panic("rtqkill route really not free"); 25753541Sshin 25853541Sshin err = rtrequest(RTM_DELETE, 25953541Sshin (struct sockaddr *)rt_key(rt), 26053541Sshin rt->rt_gateway, rt_mask(rt), 261186119Sqingli rt->rt_flags|RTF_RNH_LOCKED, 0); 26253541Sshin if (err) { 26353541Sshin log(LOG_WARNING, "in6_rtqkill: error %d", err); 26453541Sshin } else { 26553541Sshin ap->killed++; 26653541Sshin } 26753541Sshin } else { 26853541Sshin if (ap->updating 269150351Sandre && (rt->rt_rmx.rmx_expire - time_uptime 270181832Sbz > V_rtq_reallyold6)) { 271150351Sandre rt->rt_rmx.rmx_expire = time_uptime 272181832Sbz + V_rtq_reallyold6; 27353541Sshin } 27453541Sshin ap->nextstop = lmin(ap->nextstop, 27553541Sshin rt->rt_rmx.rmx_expire); 27653541Sshin } 27753541Sshin } 27853541Sshin 27953541Sshin return 0; 28053541Sshin} 28153541Sshin 28253541Sshin#define RTQ_TIMEOUT 60*10 /* run no less than once every ten minutes */ 283207369Sbzstatic VNET_DEFINE(int, rtq_timeout6) = RTQ_TIMEOUT; 284195699Srwatsonstatic VNET_DEFINE(struct callout, rtq_timer6); 28553541Sshin 286195727Srwatson#define V_rtq_timeout6 VNET(rtq_timeout6) 287195727Srwatson#define V_rtq_timer6 VNET(rtq_timer6) 288195699Srwatson 28953541Sshinstatic void 29053541Sshinin6_rtqtimo(void *rock) 29153541Sshin{ 292183550Szec CURVNET_SET_QUIET((struct vnet *) rock); 293193232Sbz struct radix_node_head *rnh; 29453541Sshin struct rtqk_arg arg; 29553541Sshin struct timeval atv; 29653541Sshin static time_t last_adjusted_timeout = 0; 29753541Sshin 298193232Sbz rnh = rt_tables_get_rnh(0, AF_INET6); 299193232Sbz if (rnh == NULL) { 300193232Sbz CURVNET_RESTORE(); 301193232Sbz return; 302193232Sbz } 30353541Sshin arg.found = arg.killed = 0; 30453541Sshin arg.rnh = rnh; 305181803Sbz arg.nextstop = time_uptime + V_rtq_timeout6; 30653541Sshin arg.draining = arg.updating = 0; 307108250Shsu RADIX_NODE_HEAD_LOCK(rnh); 30853541Sshin rnh->rnh_walktree(rnh, in6_rtqkill, &arg); 309108250Shsu RADIX_NODE_HEAD_UNLOCK(rnh); 31053541Sshin 31153541Sshin /* 31253541Sshin * Attempt to be somewhat dynamic about this: 31353541Sshin * If there are ``too many'' routes sitting around taking up space, 31453541Sshin * then crank down the timeout, and see if we can't make some more 31553541Sshin * go away. However, we make sure that we will never adjust more 316180084Sjulian * than once in rtq_timeout6 seconds, to keep from cranking down too 31753541Sshin * hard. 31853541Sshin */ 319181832Sbz if ((arg.found - arg.killed > V_rtq_toomany6) 320181803Sbz && (time_uptime - last_adjusted_timeout >= V_rtq_timeout6) 321181832Sbz && V_rtq_reallyold6 > V_rtq_minreallyold6) { 322181832Sbz V_rtq_reallyold6 = 2*V_rtq_reallyold6 / 3; 323181832Sbz if (V_rtq_reallyold6 < V_rtq_minreallyold6) { 324181832Sbz V_rtq_reallyold6 = V_rtq_minreallyold6; 32553541Sshin } 32653541Sshin 327160123Soleg last_adjusted_timeout = time_uptime; 32853541Sshin#ifdef DIAGNOSTIC 329181832Sbz log(LOG_DEBUG, "in6_rtqtimo: adjusted rtq_reallyold6 to %d", 330181832Sbz V_rtq_reallyold6); 33153541Sshin#endif 33253541Sshin arg.found = arg.killed = 0; 33353541Sshin arg.updating = 1; 334108250Shsu RADIX_NODE_HEAD_LOCK(rnh); 33553541Sshin rnh->rnh_walktree(rnh, in6_rtqkill, &arg); 336108250Shsu RADIX_NODE_HEAD_UNLOCK(rnh); 33753541Sshin } 33853541Sshin 33953541Sshin atv.tv_usec = 0; 340160123Soleg atv.tv_sec = arg.nextstop - time_uptime; 341181803Sbz callout_reset(&V_rtq_timer6, tvtohz(&atv), in6_rtqtimo, rock); 342183550Szec CURVNET_RESTORE(); 34353541Sshin} 34453541Sshin 34553541Sshin/* 34653541Sshin * Age old PMTUs. 34753541Sshin */ 34853541Sshinstruct mtuex_arg { 34953541Sshin struct radix_node_head *rnh; 35053541Sshin time_t nextstop; 35153541Sshin}; 352195699Srwatsonstatic VNET_DEFINE(struct callout, rtq_mtutimer); 353195727Srwatson#define V_rtq_mtutimer VNET(rtq_mtutimer) 354195699Srwatson 35553541Sshinstatic int 35653541Sshinin6_mtuexpire(struct radix_node *rn, void *rock) 35753541Sshin{ 35853541Sshin struct rtentry *rt = (struct rtentry *)rn; 35953541Sshin struct mtuex_arg *ap = rock; 36053541Sshin 36153541Sshin /* sanity */ 36253541Sshin if (!rt) 36353541Sshin panic("rt == NULL in in6_mtuexpire"); 36453541Sshin 36553541Sshin if (rt->rt_rmx.rmx_expire && !(rt->rt_flags & RTF_PROBEMTU)) { 366150351Sandre if (rt->rt_rmx.rmx_expire <= time_uptime) { 36753541Sshin rt->rt_flags |= RTF_PROBEMTU; 36853541Sshin } else { 36953541Sshin ap->nextstop = lmin(ap->nextstop, 37053541Sshin rt->rt_rmx.rmx_expire); 37153541Sshin } 37253541Sshin } 37353541Sshin 37453541Sshin return 0; 37553541Sshin} 37653541Sshin 37753541Sshin#define MTUTIMO_DEFAULT (60*1) 37853541Sshin 37953541Sshinstatic void 38053541Sshinin6_mtutimo(void *rock) 38153541Sshin{ 382183550Szec CURVNET_SET_QUIET((struct vnet *) rock); 383193232Sbz struct radix_node_head *rnh; 38453541Sshin struct mtuex_arg arg; 38553541Sshin struct timeval atv; 38653541Sshin 387193232Sbz rnh = rt_tables_get_rnh(0, AF_INET6); 388193232Sbz if (rnh == NULL) { 389193232Sbz CURVNET_RESTORE(); 390193232Sbz return; 391193232Sbz } 39253541Sshin arg.rnh = rnh; 393160123Soleg arg.nextstop = time_uptime + MTUTIMO_DEFAULT; 394108250Shsu RADIX_NODE_HEAD_LOCK(rnh); 39553541Sshin rnh->rnh_walktree(rnh, in6_mtuexpire, &arg); 396108250Shsu RADIX_NODE_HEAD_UNLOCK(rnh); 39753541Sshin 39853541Sshin atv.tv_usec = 0; 399160123Soleg atv.tv_sec = arg.nextstop - time_uptime; 400136184Ssuz if (atv.tv_sec < 0) { 40153541Sshin printf("invalid mtu expiration time on routing table\n"); 402160123Soleg arg.nextstop = time_uptime + 30; /* last resort */ 403160123Soleg atv.tv_sec = 30; 40453541Sshin } 405181803Sbz callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock); 406183550Szec CURVNET_RESTORE(); 40753541Sshin} 40853541Sshin 40953541Sshin/* 41053541Sshin * Initialize our routing tree. 411178888Sjulian * XXX MRT When off == 0, we are being called from vfs_export.c 412178888Sjulian * so just set up their table and leave. (we know what the correct 413178888Sjulian * value should be so just use that).. FIX AFTER RELENG_7 is MFC'd 414178888Sjulian * see also comments in in_inithead() vfs_export.c and domain.h 41553541Sshin */ 41653541Sshinint 41753541Sshinin6_inithead(void **head, int off) 41853541Sshin{ 41953541Sshin struct radix_node_head *rnh; 42053541Sshin 421178888Sjulian if (!rn_inithead(head, offsetof(struct sockaddr_in6, sin6_addr) << 3)) 422178888Sjulian return 0; /* See above */ 42353541Sshin 424178888Sjulian if (off == 0) /* See above */ 425178888Sjulian return 1; /* only do the rest for the real thing */ 42653541Sshin 42753541Sshin rnh = *head; 428193232Sbz KASSERT(rnh == rt_tables_get_rnh(0, AF_INET6), ("rnh?")); 42953541Sshin rnh->rnh_addaddr = in6_addroute; 43053541Sshin rnh->rnh_matchaddr = in6_matroute; 431181803Sbz callout_init(&V_rtq_timer6, CALLOUT_MPSAFE); 432181803Sbz callout_init(&V_rtq_mtutimer, CALLOUT_MPSAFE); 433191816Szec in6_rtqtimo(curvnet); /* kick off timeout first time */ 434191816Szec in6_mtutimo(curvnet); /* kick off timeout first time */ 43553541Sshin return 1; 43653541Sshin} 437193731Szec 438193731Szec#ifdef VIMAGE 439193731Szecint 440193731Szecin6_detachhead(void **head, int off) 441193731Szec{ 442193731Szec 443193731Szec callout_drain(&V_rtq_timer6); 444193731Szec callout_drain(&V_rtq_mtutimer); 445193731Szec return (1); 446193731Szec} 447193731Szec#endif 448