2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * DECnet Routing Functions (Endnode and Router)
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
12 * Steve Whitehouse : Fixes to allow "intra-ethernet" and
13 * "return-to-sender" bits on outgoing
15 * Steve Whitehouse : Timeouts for cached routes.
16 * Steve Whitehouse : Use dst cache for input routes too.
17 * Steve Whitehouse : Fixed error values in dn_send_skb.
18 * Steve Whitehouse : Rework routing functions to better fit
19 * DECnet routing design
20 * Alexey Kuznetsov : New SMP locking
21 * Steve Whitehouse : More SMP locking changes & dn_cache_dump()
22 * Steve Whitehouse : Prerouting NF hook, now really is prerouting.
23 * Fixed possible skb leak in rtnetlink funcs.
24 * Steve Whitehouse : Dave Miller's dynamic hash table sizing and
25 * Alexey Kuznetsov's finer grained locking
27 * Steve Whitehouse : Routing is now starting to look like a
28 * sensible set of code now, mainly due to
29 * my copying the IPv4 routing code. The
30 * hooks here are modified and will continue
31 * to evolve for a while.
32 * Steve Whitehouse : Real SMP at last :-) Also new netfilter
33 * stuff. Look out raw sockets your days
35 * Steve Whitehouse : Added return-to-sender functions. Added
36 * backlog congestion level return codes.
37 * Steve Whitehouse : Fixed bug where routes were set up with
38 * no ref count on net devices.
39 * Steve Whitehouse : RCU for the route cache
40 * Steve Whitehouse : Preparations for the flow cache
41 * Steve Whitehouse : Prepare for nonlinear skbs
44 /******************************************************************************
45 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
47 This program is free software; you can redistribute it and/or modify
48 it under the terms of the GNU General Public License as published by
49 the Free Software Foundation; either version 2 of the License, or
52 This program is distributed in the hope that it will be useful,
53 but WITHOUT ANY WARRANTY; without even the implied warranty of
54 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
55 GNU General Public License for more details.
56 *******************************************************************************/
58 #include <linux/errno.h>
59 #include <linux/types.h>
60 #include <linux/socket.h>
62 #include <linux/kernel.h>
63 #include <linux/sockios.h>
64 #include <linux/net.h>
65 #include <linux/netdevice.h>
66 #include <linux/inet.h>
67 #include <linux/route.h>
68 #include <linux/in_route.h>
69 #include <linux/slab.h>
72 #include <linux/proc_fs.h>
73 #include <linux/seq_file.h>
74 #include <linux/init.h>
75 #include <linux/rtnetlink.h>
76 #include <linux/string.h>
77 #include <linux/netfilter_decnet.h>
78 #include <linux/rcupdate.h>
79 #include <linux/times.h>
80 #include <asm/errno.h>
81 #include <net/net_namespace.h>
82 #include <net/netlink.h>
83 #include <net/neighbour.h>
86 #include <net/fib_rules.h>
88 #include <net/dn_dev.h>
89 #include <net/dn_nsp.h>
90 #include <net/dn_route.h>
91 #include <net/dn_neigh.h>
92 #include <net/dn_fib.h>
94 struct dn_rt_hash_bucket
96 struct dn_route __rcu *chain;
100 extern struct neigh_table dn_neigh_table;
103 static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
105 static const int dn_rt_min_delay = 2 * HZ;
106 static const int dn_rt_max_delay = 10 * HZ;
107 static const int dn_rt_mtu_expires = 10 * 60 * HZ;
109 static unsigned long dn_rt_deadline;
111 static int dn_dst_gc(struct dst_ops *ops);
112 static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
113 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
114 static void dn_dst_link_failure(struct sk_buff *);
115 static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
116 static int dn_route_input(struct sk_buff *);
117 static void dn_run_flush(unsigned long dummy);
119 static struct dn_rt_hash_bucket *dn_rt_hash_table;
120 static unsigned dn_rt_hash_mask;
122 static struct timer_list dn_route_timer;
123 static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0);
124 int decnet_dst_gc_interval = 2;
126 static struct dst_ops dn_dst_ops = {
128 .protocol = cpu_to_be16(ETH_P_DNA_RT),
131 .check = dn_dst_check,
132 .negative_advice = dn_dst_negative_advice,
133 .link_failure = dn_dst_link_failure,
134 .update_pmtu = dn_dst_update_pmtu,
137 static __inline__ unsigned dn_hash(__le16 src, __le16 dst)
139 __u16 tmp = (__u16 __force)(src ^ dst);
143 return dn_rt_hash_mask & (unsigned)tmp;
146 static inline void dnrt_free(struct dn_route *rt)
148 call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
151 static inline void dnrt_drop(struct dn_route *rt)
153 dst_release(&rt->dst);
154 call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
157 static void dn_dst_check_expire(unsigned long dummy)
161 struct dn_route __rcu **rtp;
162 unsigned long now = jiffies;
163 unsigned long expire = 120 * HZ;
165 for (i = 0; i <= dn_rt_hash_mask; i++) {
166 rtp = &dn_rt_hash_table[i].chain;
168 spin_lock(&dn_rt_hash_table[i].lock);
169 while ((rt = rcu_dereference_protected(*rtp,
170 lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
171 if (atomic_read(&rt->dst.__refcnt) ||
172 (now - rt->dst.lastuse) < expire) {
173 rtp = &rt->dst.dn_next;
176 *rtp = rt->dst.dn_next;
177 rt->dst.dn_next = NULL;
180 spin_unlock(&dn_rt_hash_table[i].lock);
182 if ((jiffies - now) > 0)
186 mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
189 static int dn_dst_gc(struct dst_ops *ops)
192 struct dn_route __rcu **rtp;
194 unsigned long now = jiffies;
195 unsigned long expire = 10 * HZ;
197 for (i = 0; i <= dn_rt_hash_mask; i++) {
199 spin_lock_bh(&dn_rt_hash_table[i].lock);
200 rtp = &dn_rt_hash_table[i].chain;
202 while ((rt = rcu_dereference_protected(*rtp,
203 lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
204 if (atomic_read(&rt->dst.__refcnt) ||
205 (now - rt->dst.lastuse) < expire) {
206 rtp = &rt->dst.dn_next;
209 *rtp = rt->dst.dn_next;
210 rt->dst.dn_next = NULL;
214 spin_unlock_bh(&dn_rt_hash_table[i].lock);
221 * The decnet standards don't impose a particular minimum mtu, what they
222 * do insist on is that the routing layer accepts a datagram of at least
223 * 230 bytes long. Here we have to subtract the routing header length from
224 * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
225 * assume the worst and use a long header size.
227 * We update both the mtu and the advertised mss (i.e. the segment size we
228 * advertise to the other end).
230 static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
233 struct dn_dev *dn = dst->neighbour ?
234 rcu_dereference_raw(dst->neighbour->dev->dn_ptr) : NULL;
236 if (dn && dn->use_long == 0)
241 if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) {
242 if (!(dst_metric_locked(dst, RTAX_MTU))) {
243 dst_metric_set(dst, RTAX_MTU, mtu);
244 dst_set_expires(dst, dn_rt_mtu_expires);
246 if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
247 u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
248 if (dst_metric(dst, RTAX_ADVMSS) > mss)
249 dst_metric_set(dst, RTAX_ADVMSS, mss);
255 * When a route has been marked obsolete. (e.g. routing cache flush)
257 static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
262 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
268 static void dn_dst_link_failure(struct sk_buff *skb)
272 static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
274 return ((fl1->fld_dst ^ fl2->fld_dst) |
275 (fl1->fld_src ^ fl2->fld_src) |
276 (fl1->mark ^ fl2->mark) |
277 (fl1->fld_scope ^ fl2->fld_scope) |
278 (fl1->oif ^ fl2->oif) |
279 (fl1->iif ^ fl2->iif)) == 0;
282 static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp)
284 struct dn_route *rth;
285 struct dn_route __rcu **rthp;
286 unsigned long now = jiffies;
288 rthp = &dn_rt_hash_table[hash].chain;
290 spin_lock_bh(&dn_rt_hash_table[hash].lock);
291 while ((rth = rcu_dereference_protected(*rthp,
292 lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) {
293 if (compare_keys(&rth->fl, &rt->fl)) {
295 *rthp = rth->dst.dn_next;
296 rcu_assign_pointer(rth->dst.dn_next,
297 dn_rt_hash_table[hash].chain);
298 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
300 dst_use(&rth->dst, now);
301 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
307 rthp = &rth->dst.dn_next;
310 rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain);
311 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
313 dst_use(&rt->dst, now);
314 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
319 static void dn_run_flush(unsigned long dummy)
322 struct dn_route *rt, *next;
324 for (i = 0; i < dn_rt_hash_mask; i++) {
325 spin_lock_bh(&dn_rt_hash_table[i].lock);
327 if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL)
328 goto nothing_to_declare;
330 for(; rt; rt = next) {
331 next = rcu_dereference_raw(rt->dst.dn_next);
332 RCU_INIT_POINTER(rt->dst.dn_next, NULL);
333 dst_free((struct dst_entry *)rt);
337 spin_unlock_bh(&dn_rt_hash_table[i].lock);
341 static DEFINE_SPINLOCK(dn_rt_flush_lock);
343 void dn_rt_cache_flush(int delay)
345 unsigned long now = jiffies;
346 int user_mode = !in_interrupt();
349 delay = dn_rt_min_delay;
351 spin_lock_bh(&dn_rt_flush_lock);
353 if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
354 long tmo = (long)(dn_rt_deadline - now);
356 if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
364 spin_unlock_bh(&dn_rt_flush_lock);
369 if (dn_rt_deadline == 0)
370 dn_rt_deadline = now + dn_rt_max_delay;
372 dn_rt_flush_timer.expires = now + delay;
373 add_timer(&dn_rt_flush_timer);
374 spin_unlock_bh(&dn_rt_flush_lock);
378 * dn_return_short - Return a short packet to its sender
379 * @skb: The packet to return
382 static int dn_return_short(struct sk_buff *skb)
384 struct dn_skb_cb *cb;
389 /* Add back headers */
390 skb_push(skb, skb->data - skb_network_header(skb));
392 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
396 /* Skip packet length and point to flags */
398 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
404 *ptr = 0; /* Zero hop count */
408 skb->pkt_type = PACKET_OUTGOING;
409 dn_rt_finish_output(skb, NULL, NULL);
410 return NET_RX_SUCCESS;
414 * dn_return_long - Return a long packet to its sender
415 * @skb: The long format packet to return
418 static int dn_return_long(struct sk_buff *skb)
420 struct dn_skb_cb *cb;
422 unsigned char *src_addr, *dst_addr;
423 unsigned char tmp[ETH_ALEN];
425 /* Add back all headers */
426 skb_push(skb, skb->data - skb_network_header(skb));
428 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
432 /* Ignore packet length and point to flags */
436 if (*ptr & DN_RT_F_PF) {
437 char padlen = (*ptr & ~DN_RT_F_PF);
441 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
447 *ptr = 0; /* Zero hop count */
449 /* Swap source and destination */
450 memcpy(tmp, src_addr, ETH_ALEN);
451 memcpy(src_addr, dst_addr, ETH_ALEN);
452 memcpy(dst_addr, tmp, ETH_ALEN);
454 skb->pkt_type = PACKET_OUTGOING;
455 dn_rt_finish_output(skb, dst_addr, src_addr);
456 return NET_RX_SUCCESS;
460 * dn_route_rx_packet - Try and find a route for an incoming packet
461 * @skb: The packet to find a route for
463 * Returns: result of input function if route is found, error code otherwise
465 static int dn_route_rx_packet(struct sk_buff *skb)
467 struct dn_skb_cb *cb;
470 if ((err = dn_route_input(skb)) == 0)
471 return dst_input(skb);
474 if (decnet_debug_level & 4) {
475 char *devname = skb->dev ? skb->dev->name : "???";
478 "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
479 (int)cb->rt_flags, devname, skb->len,
480 le16_to_cpu(cb->src), le16_to_cpu(cb->dst),
484 if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
485 switch(cb->rt_flags & DN_RT_PKT_MSK) {
486 case DN_RT_PKT_SHORT:
487 return dn_return_short(skb);
489 return dn_return_long(skb);
497 static int dn_route_rx_long(struct sk_buff *skb)
499 struct dn_skb_cb *cb = DN_SKB_CB(skb);
500 unsigned char *ptr = skb->data;
502 if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
506 skb_reset_transport_header(skb);
508 /* Destination info */
510 cb->dst = dn_eth2dn(ptr);
511 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
518 cb->src = dn_eth2dn(ptr);
519 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
524 cb->hops = *ptr++; /* Visit Count */
526 return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL,
536 static int dn_route_rx_short(struct sk_buff *skb)
538 struct dn_skb_cb *cb = DN_SKB_CB(skb);
539 unsigned char *ptr = skb->data;
541 if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
545 skb_reset_transport_header(skb);
547 cb->dst = *(__le16 *)ptr;
549 cb->src = *(__le16 *)ptr;
551 cb->hops = *ptr & 0x3f;
553 return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL,
561 static int dn_route_discard(struct sk_buff *skb)
564 * I know we drop the packet here, but thats considered success in
568 return NET_RX_SUCCESS;
571 static int dn_route_ptp_hello(struct sk_buff *skb)
574 dn_neigh_pointopoint_hello(skb);
575 return NET_RX_SUCCESS;
578 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
580 struct dn_skb_cb *cb;
581 unsigned char flags = 0;
582 __u16 len = le16_to_cpu(*(__le16 *)skb->data);
583 struct dn_dev *dn = rcu_dereference(dev->dn_ptr);
584 unsigned char padlen = 0;
586 if (!net_eq(dev_net(dev), &init_net))
592 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
595 if (!pskb_may_pull(skb, 3))
609 cb->iif = dev->ifindex;
612 * If we have padding, remove it.
614 if (flags & DN_RT_F_PF) {
615 padlen = flags & ~DN_RT_F_PF;
616 if (!pskb_may_pull(skb, padlen + 1))
618 skb_pull(skb, padlen);
622 skb_reset_network_header(skb);
625 * Weed out future version DECnet
627 if (flags & DN_RT_F_VER)
630 cb->rt_flags = flags;
632 if (decnet_debug_level & 1)
634 "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
635 (int)flags, (dev) ? dev->name : "???", len, skb->len,
638 if (flags & DN_RT_PKT_CNTL) {
639 if (unlikely(skb_linearize(skb)))
642 switch(flags & DN_RT_CNTL_MSK) {
644 dn_dev_init_pkt(skb);
647 dn_dev_veri_pkt(skb);
651 if (dn->parms.state != DN_DEV_S_RU)
654 switch(flags & DN_RT_CNTL_MSK) {
656 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
662 return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE,
666 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
668 dn_neigh_router_hello);
671 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
673 dn_neigh_endnode_hello);
676 if (dn->parms.state != DN_DEV_S_RU)
679 skb_pull(skb, 1); /* Pull flags */
681 switch(flags & DN_RT_PKT_MSK) {
683 return dn_route_rx_long(skb);
684 case DN_RT_PKT_SHORT:
685 return dn_route_rx_short(skb);
695 static int dn_output(struct sk_buff *skb)
697 struct dst_entry *dst = skb_dst(skb);
698 struct dn_route *rt = (struct dn_route *)dst;
699 struct net_device *dev = dst->dev;
700 struct dn_skb_cb *cb = DN_SKB_CB(skb);
701 struct neighbour *neigh;
705 if ((neigh = dst->neighbour) == NULL)
710 cb->src = rt->rt_saddr;
711 cb->dst = rt->rt_daddr;
714 * Always set the Intra-Ethernet bit on all outgoing packets
715 * originated on this node. Only valid flag from upper layers
716 * is return-to-sender-requested. Set hop count to 0 too.
718 cb->rt_flags &= ~DN_RT_F_RQR;
719 cb->rt_flags |= DN_RT_F_IE;
722 return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev,
727 printk(KERN_DEBUG "dn_output: This should not happen\n");
734 static int dn_forward(struct sk_buff *skb)
736 struct dn_skb_cb *cb = DN_SKB_CB(skb);
737 struct dst_entry *dst = skb_dst(skb);
738 struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
740 struct neighbour *neigh = dst->neighbour;
742 #ifdef CONFIG_NETFILTER
743 struct net_device *dev = skb->dev;
746 if (skb->pkt_type != PACKET_HOST)
749 /* Ensure that we have enough space for headers */
750 rt = (struct dn_route *)skb_dst(skb);
751 header_len = dn_db->use_long ? 21 : 6;
752 if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len))
756 * Hop count exceeded.
761 skb->dev = rt->dst.dev;
764 * If packet goes out same interface it came in on, then set
765 * the Intra-Ethernet bit. This has no effect for short
766 * packets, so we don't need to test for them here.
768 cb->rt_flags &= ~DN_RT_F_IE;
769 if (rt->rt_flags & RTCF_DOREDIRECT)
770 cb->rt_flags |= DN_RT_F_IE;
772 return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev,
781 * Used to catch bugs. This should never normally get
784 static int dn_rt_bug(struct sk_buff *skb)
786 if (net_ratelimit()) {
787 struct dn_skb_cb *cb = DN_SKB_CB(skb);
789 printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
790 le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
798 static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
800 struct dn_fib_info *fi = res->fi;
801 struct net_device *dev = rt->dst.dev;
806 if (DN_FIB_RES_GW(*res) &&
807 DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
808 rt->rt_gateway = DN_FIB_RES_GW(*res);
809 dst_import_metrics(&rt->dst, fi->fib_metrics);
811 rt->rt_type = res->type;
813 if (dev != NULL && rt->dst.neighbour == NULL) {
814 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
817 rt->dst.neighbour = n;
820 if (dst_metric(&rt->dst, RTAX_MTU) == 0 ||
821 dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu)
822 dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu);
823 mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst));
824 if (dst_metric(&rt->dst, RTAX_ADVMSS) == 0 ||
825 dst_metric(&rt->dst, RTAX_ADVMSS) > mss)
826 dst_metric_set(&rt->dst, RTAX_ADVMSS, mss);
830 static inline int dn_match_addr(__le16 addr1, __le16 addr2)
832 __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2);
841 static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
844 struct dn_dev *dn_db;
845 struct dn_ifaddr *ifa;
850 dn_db = rcu_dereference(dev->dn_ptr);
851 for (ifa = rcu_dereference(dn_db->ifa_list);
853 ifa = rcu_dereference(ifa->ifa_next)) {
854 if (ifa->ifa_scope > scope)
857 saddr = ifa->ifa_local;
860 ret = dn_match_addr(daddr, ifa->ifa_local);
861 if (ret > best_match)
862 saddr = ifa->ifa_local;
864 saddr = ifa->ifa_local;
871 static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
873 return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
876 static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
878 __le16 mask = dnet_make_mask(res->prefixlen);
879 return (daddr&~mask)|res->fi->fib_nh->nh_gw;
882 static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard)
884 struct flowi fl = { .fld_dst = oldflp->fld_dst,
885 .fld_src = oldflp->fld_src,
886 .fld_scope = RT_SCOPE_UNIVERSE,
887 .mark = oldflp->mark,
888 .iif = init_net.loopback_dev->ifindex,
889 .oif = oldflp->oif };
890 struct dn_route *rt = NULL;
891 struct net_device *dev_out = NULL, *dev;
892 struct neighbour *neigh = NULL;
895 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
900 if (decnet_debug_level & 16)
902 "dn_route_output_slow: dst=%04x src=%04x mark=%d"
903 " iif=%d oif=%d\n", le16_to_cpu(oldflp->fld_dst),
904 le16_to_cpu(oldflp->fld_src),
905 oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif);
907 /* If we have an output interface, verify its a DECnet device */
909 dev_out = dev_get_by_index(&init_net, oldflp->oif);
911 if (dev_out && dev_out->dn_ptr == NULL) {
919 /* If we have a source address, verify that its a local address */
920 if (oldflp->fld_src) {
921 err = -EADDRNOTAVAIL;
924 if (dn_dev_islocal(dev_out, oldflp->fld_src))
930 for_each_netdev_rcu(&init_net, dev) {
933 if (!dn_dev_islocal(dev, oldflp->fld_src))
935 if ((dev->flags & IFF_LOOPBACK) &&
937 !dn_dev_islocal(dev, oldflp->fld_dst))
951 /* No destination? Assume its local */
953 fl.fld_dst = fl.fld_src;
955 err = -EADDRNOTAVAIL;
958 dev_out = init_net.loopback_dev;
962 fl.fld_src = dnet_select_source(dev_out, 0,
967 fl.oif = init_net.loopback_dev->ifindex;
968 res.type = RTN_LOCAL;
972 if (decnet_debug_level & 16)
974 "dn_route_output_slow: initial checks complete."
975 " dst=%o4x src=%04x oif=%d try_hard=%d\n",
976 le16_to_cpu(fl.fld_dst), le16_to_cpu(fl.fld_src),
980 * N.B. If the kernel is compiled without router support then
981 * dn_fib_lookup() will evaluate to non-zero so this if () block
982 * will always be executed.
985 if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) {
986 struct dn_dev *dn_db;
990 * Here the fallback is basically the standard algorithm for
991 * routing in endnodes which is described in the DECnet routing
994 * If we are not trying hard, look in neighbour cache.
995 * The result is tested to ensure that if a specific output
996 * device/source address was requested, then we honour that
1000 neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fl.fld_dst);
1003 (neigh->dev->ifindex != oldflp->oif)) ||
1005 (!dn_dev_islocal(neigh->dev,
1006 oldflp->fld_src)))) {
1007 neigh_release(neigh);
1012 if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
1013 dev_out = init_net.loopback_dev;
1014 res.type = RTN_LOCAL;
1016 dev_out = neigh->dev;
1024 /* Not there? Perhaps its a local address */
1025 if (dev_out == NULL)
1026 dev_out = dn_dev_get_default();
1028 if (dev_out == NULL)
1030 dn_db = rcu_dereference_raw(dev_out->dn_ptr);
1031 /* Possible improvement - check all devices for local addr */
1032 if (dn_dev_islocal(dev_out, fl.fld_dst)) {
1034 dev_out = init_net.loopback_dev;
1036 res.type = RTN_LOCAL;
1039 /* Not local either.... try sending it to the default router */
1040 neigh = neigh_clone(dn_db->router);
1041 BUG_ON(neigh && neigh->dev != dev_out);
1043 /* Ok then, we assume its directly connected and move on */
1046 gateway = ((struct dn_neigh *)neigh)->addr;
1048 gateway = fl.fld_dst;
1049 if (fl.fld_src == 0) {
1050 fl.fld_src = dnet_select_source(dev_out, gateway,
1051 res.type == RTN_LOCAL ?
1054 if (fl.fld_src == 0 && res.type != RTN_LOCAL)
1057 fl.oif = dev_out->ifindex;
1062 if (res.type == RTN_NAT)
1065 if (res.type == RTN_LOCAL) {
1067 fl.fld_src = fl.fld_dst;
1070 dev_out = init_net.loopback_dev;
1072 fl.oif = dev_out->ifindex;
1074 dn_fib_info_put(res.fi);
1079 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1080 dn_fib_select_multipath(&fl, &res);
1083 * We could add some logic to deal with default routes here and
1084 * get rid of some of the special casing above.
1088 fl.fld_src = DN_FIB_RES_PREFSRC(res);
1092 dev_out = DN_FIB_RES_DEV(res);
1094 fl.oif = dev_out->ifindex;
1095 gateway = DN_FIB_RES_GW(res);
1098 if (dev_out->flags & IFF_LOOPBACK)
1099 flags |= RTCF_LOCAL;
1101 rt = dst_alloc(&dn_dst_ops);
1105 atomic_set(&rt->dst.__refcnt, 1);
1106 rt->dst.flags = DST_HOST;
1108 rt->fl.fld_src = oldflp->fld_src;
1109 rt->fl.fld_dst = oldflp->fld_dst;
1110 rt->fl.oif = oldflp->oif;
1112 rt->fl.mark = oldflp->mark;
1114 rt->rt_saddr = fl.fld_src;
1115 rt->rt_daddr = fl.fld_dst;
1116 rt->rt_gateway = gateway ? gateway : fl.fld_dst;
1117 rt->rt_local_src = fl.fld_src;
1119 rt->rt_dst_map = fl.fld_dst;
1120 rt->rt_src_map = fl.fld_src;
1122 rt->dst.dev = dev_out;
1124 rt->dst.neighbour = neigh;
1127 rt->dst.lastuse = jiffies;
1128 rt->dst.output = dn_output;
1129 rt->dst.input = dn_rt_bug;
1130 rt->rt_flags = flags;
1131 if (flags & RTCF_LOCAL)
1132 rt->dst.input = dn_nsp_rx;
1134 err = dn_rt_set_next_hop(rt, &res);
1138 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1139 dn_insert_route(rt, hash, (struct dn_route **)pprt);
1143 neigh_release(neigh);
1145 dn_fib_res_put(&res);
1152 err = -EADDRNOTAVAIL;
1167 * N.B. The flags may be moved into the flowi at some future stage.
1169 static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags)
1171 unsigned hash = dn_hash(flp->fld_src, flp->fld_dst);
1172 struct dn_route *rt = NULL;
1174 if (!(flags & MSG_TRYHARD)) {
1176 for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt;
1177 rt = rcu_dereference_bh(rt->dst.dn_next)) {
1178 if ((flp->fld_dst == rt->fl.fld_dst) &&
1179 (flp->fld_src == rt->fl.fld_src) &&
1180 (flp->mark == rt->fl.mark) &&
1181 dn_is_output_route(rt) &&
1182 (rt->fl.oif == flp->oif)) {
1183 dst_use(&rt->dst, jiffies);
1184 rcu_read_unlock_bh();
1189 rcu_read_unlock_bh();
1192 return dn_route_output_slow(pprt, flp, flags);
1195 static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags)
1199 err = __dn_route_output_key(pprt, flp, flags);
1200 if (err == 0 && flp->proto) {
1201 err = xfrm_lookup(&init_net, pprt, flp, NULL, 0);
1206 int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags)
1210 err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
1211 if (err == 0 && fl->proto) {
1212 err = xfrm_lookup(&init_net, pprt, fl, sk,
1213 (flags & MSG_DONTWAIT) ? 0 : XFRM_LOOKUP_WAIT);
1218 static int dn_route_input_slow(struct sk_buff *skb)
1220 struct dn_route *rt = NULL;
1221 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1222 struct net_device *in_dev = skb->dev;
1223 struct net_device *out_dev = NULL;
1224 struct dn_dev *dn_db;
1225 struct neighbour *neigh = NULL;
1229 __le16 local_src = 0;
1230 struct flowi fl = { .fld_dst = cb->dst,
1232 .fld_scope = RT_SCOPE_UNIVERSE,
1234 .iif = skb->dev->ifindex };
1235 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1241 if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL)
1244 /* Zero source addresses are not allowed */
1245 if (fl.fld_src == 0)
1249 * In this case we've just received a packet from a source
1250 * outside ourselves pretending to come from us. We don't
1251 * allow it any further to prevent routing loops, spoofing and
1252 * other nasties. Loopback packets already have the dst attached
1253 * so this only affects packets which have originated elsewhere.
1256 if (dn_dev_islocal(in_dev, cb->src))
1259 err = dn_fib_lookup(&fl, &res);
1264 * Is the destination us ?
1266 if (!dn_dev_islocal(in_dev, cb->dst))
1269 res.type = RTN_LOCAL;
1271 __le16 src_map = fl.fld_src;
1274 out_dev = DN_FIB_RES_DEV(res);
1275 if (out_dev == NULL) {
1276 if (net_ratelimit())
1277 printk(KERN_CRIT "Bug in dn_route_input_slow() "
1278 "No output device\n");
1284 src_map = fl.fld_src; /* no NAT support for now */
1286 gateway = DN_FIB_RES_GW(res);
1287 if (res.type == RTN_NAT) {
1288 fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res);
1289 dn_fib_res_put(&res);
1291 if (dn_fib_lookup(&fl, &res))
1294 if (res.type != RTN_UNICAST)
1297 gateway = fl.fld_dst;
1299 fl.fld_src = src_map;
1305 * Forwarding check here, we only check for forwarding
1306 * being turned off, if you want to only forward intra
1307 * area, its up to you to set the routing tables up
1310 if (dn_db->parms.forwarding == 0)
1313 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1314 dn_fib_select_multipath(&fl, &res);
1317 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1318 * flag as a hint to set the intra-ethernet bit when
1319 * forwarding. If we've got NAT in operation, we don't do
1320 * this optimisation.
1322 if (out_dev == in_dev && !(flags & RTCF_NAT))
1323 flags |= RTCF_DOREDIRECT;
1325 local_src = DN_FIB_RES_PREFSRC(res);
1328 case RTN_UNREACHABLE:
1331 flags |= RTCF_LOCAL;
1332 fl.fld_src = cb->dst;
1333 fl.fld_dst = cb->src;
1335 /* Routing tables gave us a gateway */
1339 /* Packet was intra-ethernet, so we know its on-link */
1340 if (cb->rt_flags & DN_RT_F_IE) {
1342 flags |= RTCF_DIRECTSRC;
1346 /* Use the default router if there is one */
1347 neigh = neigh_clone(dn_db->router);
1349 gateway = ((struct dn_neigh *)neigh)->addr;
1353 /* Close eyes and pray */
1355 flags |= RTCF_DIRECTSRC;
1362 rt = dst_alloc(&dn_dst_ops);
1366 rt->rt_saddr = fl.fld_src;
1367 rt->rt_daddr = fl.fld_dst;
1368 rt->rt_gateway = fl.fld_dst;
1370 rt->rt_gateway = gateway;
1371 rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
1373 rt->rt_dst_map = fl.fld_dst;
1374 rt->rt_src_map = fl.fld_src;
1376 rt->fl.fld_src = cb->src;
1377 rt->fl.fld_dst = cb->dst;
1379 rt->fl.iif = in_dev->ifindex;
1380 rt->fl.mark = fl.mark;
1382 rt->dst.flags = DST_HOST;
1383 rt->dst.neighbour = neigh;
1384 rt->dst.dev = out_dev;
1385 rt->dst.lastuse = jiffies;
1386 rt->dst.output = dn_rt_bug;
1389 rt->dst.input = dn_forward;
1392 rt->dst.output = dn_output;
1393 rt->dst.input = dn_nsp_rx;
1394 rt->dst.dev = in_dev;
1395 flags |= RTCF_LOCAL;
1398 case RTN_UNREACHABLE:
1400 rt->dst.input = dst_discard;
1402 rt->rt_flags = flags;
1404 dev_hold(rt->dst.dev);
1406 err = dn_rt_set_next_hop(rt, &res);
1410 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1411 dn_insert_route(rt, hash, &rt);
1412 skb_dst_set(skb, &rt->dst);
1416 neigh_release(neigh);
1418 dn_fib_res_put(&res);
1438 static int dn_route_input(struct sk_buff *skb)
1440 struct dn_route *rt;
1441 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1442 unsigned hash = dn_hash(cb->src, cb->dst);
1448 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
1449 rt = rcu_dereference(rt->dst.dn_next)) {
1450 if ((rt->fl.fld_src == cb->src) &&
1451 (rt->fl.fld_dst == cb->dst) &&
1452 (rt->fl.oif == 0) &&
1453 (rt->fl.mark == skb->mark) &&
1454 (rt->fl.iif == cb->iif)) {
1455 dst_use(&rt->dst, jiffies);
1457 skb_dst_set(skb, (struct dst_entry *)rt);
1463 return dn_route_input_slow(skb);
1466 static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1467 int event, int nowait, unsigned int flags)
1469 struct dn_route *rt = (struct dn_route *)skb_dst(skb);
1471 struct nlmsghdr *nlh;
1472 unsigned char *b = skb_tail_pointer(skb);
1475 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
1476 r = NLMSG_DATA(nlh);
1477 r->rtm_family = AF_DECnet;
1478 r->rtm_dst_len = 16;
1481 r->rtm_table = RT_TABLE_MAIN;
1482 RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
1483 r->rtm_type = rt->rt_type;
1484 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1485 r->rtm_scope = RT_SCOPE_UNIVERSE;
1486 r->rtm_protocol = RTPROT_UNSPEC;
1487 if (rt->rt_flags & RTCF_NOTIFY)
1488 r->rtm_flags |= RTM_F_NOTIFY;
1489 RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
1490 if (rt->fl.fld_src) {
1491 r->rtm_src_len = 16;
1492 RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src);
1495 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->dst.dev->ifindex);
1497 * Note to self - change this if input routes reverse direction when
1498 * they deal only with inputs and not with replies like they do
1501 RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src);
1502 if (rt->rt_daddr != rt->rt_gateway)
1503 RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway);
1504 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
1505 goto rtattr_failure;
1506 expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
1507 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, expires,
1509 goto rtattr_failure;
1510 if (dn_is_input_route(rt))
1511 RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
1513 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1523 * This is called by both endnodes and routers now.
1525 static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
1527 struct net *net = sock_net(in_skb->sk);
1528 struct rtattr **rta = arg;
1529 struct rtmsg *rtm = NLMSG_DATA(nlh);
1530 struct dn_route *rt = NULL;
1531 struct dn_skb_cb *cb;
1533 struct sk_buff *skb;
1536 if (!net_eq(net, &init_net))
1539 memset(&fl, 0, sizeof(fl));
1540 fl.proto = DNPROTO_NSP;
1542 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1545 skb_reset_mac_header(skb);
1546 cb = DN_SKB_CB(skb);
1549 memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2);
1551 memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2);
1553 memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1556 struct net_device *dev;
1557 if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) {
1566 skb->protocol = htons(ETH_P_DNA_RT);
1568 cb->src = fl.fld_src;
1569 cb->dst = fl.fld_dst;
1571 err = dn_route_input(skb);
1573 memset(cb, 0, sizeof(struct dn_skb_cb));
1574 rt = (struct dn_route *)skb_dst(skb);
1575 if (!err && -rt->dst.error)
1576 err = rt->dst.error;
1579 if (rta[RTA_OIF - 1])
1580 memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
1582 err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0);
1590 skb_dst_set(skb, &rt->dst);
1591 if (rtm->rtm_flags & RTM_F_NOTIFY)
1592 rt->rt_flags |= RTCF_NOTIFY;
1594 err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
1603 return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1611 * For routers, this is called from dn_fib_dump, but for endnodes its
1612 * called directly from the rtnetlink dispatch table.
1614 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1616 struct net *net = sock_net(skb->sk);
1617 struct dn_route *rt;
1621 if (!net_eq(net, &init_net))
1624 if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
1626 if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
1630 s_idx = idx = cb->args[1];
1631 for(h = 0; h <= dn_rt_hash_mask; h++) {
1637 for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0;
1639 rt = rcu_dereference_bh(rt->dst.dn_next), idx++) {
1642 skb_dst_set(skb, dst_clone(&rt->dst));
1643 if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
1644 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1645 1, NLM_F_MULTI) <= 0) {
1647 rcu_read_unlock_bh();
1652 rcu_read_unlock_bh();
1661 #ifdef CONFIG_PROC_FS
1662 struct dn_rt_cache_iter_state {
1666 static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1668 struct dn_route *rt = NULL;
1669 struct dn_rt_cache_iter_state *s = seq->private;
1671 for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1673 rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
1676 rcu_read_unlock_bh();
1681 static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1683 struct dn_rt_cache_iter_state *s = seq->private;
1685 rt = rcu_dereference_bh(rt->dst.dn_next);
1687 rcu_read_unlock_bh();
1688 if (--s->bucket < 0)
1691 rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
1696 static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1698 struct dn_route *rt = dn_rt_cache_get_first(seq);
1701 while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1704 return *pos ? NULL : rt;
1707 static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1709 struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1714 static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1717 rcu_read_unlock_bh();
1720 static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1722 struct dn_route *rt = v;
1723 char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1725 seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
1726 rt->dst.dev ? rt->dst.dev->name : "*",
1727 dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1),
1728 dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2),
1729 atomic_read(&rt->dst.__refcnt),
1731 (int) dst_metric(&rt->dst, RTAX_RTT));
1735 static const struct seq_operations dn_rt_cache_seq_ops = {
1736 .start = dn_rt_cache_seq_start,
1737 .next = dn_rt_cache_seq_next,
1738 .stop = dn_rt_cache_seq_stop,
1739 .show = dn_rt_cache_seq_show,
1742 static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
1744 return seq_open_private(file, &dn_rt_cache_seq_ops,
1745 sizeof(struct dn_rt_cache_iter_state));
1748 static const struct file_operations dn_rt_cache_seq_fops = {
1749 .owner = THIS_MODULE,
1750 .open = dn_rt_cache_seq_open,
1752 .llseek = seq_lseek,
1753 .release = seq_release_private,
1756 #endif /* CONFIG_PROC_FS */
1758 void __init dn_route_init(void)
1762 dn_dst_ops.kmem_cachep =
1763 kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
1764 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
1765 dst_entries_init(&dn_dst_ops);
1766 setup_timer(&dn_route_timer, dn_dst_check_expire, 0);
1767 dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1768 add_timer(&dn_route_timer);
1770 goal = totalram_pages >> (26 - PAGE_SHIFT);
1772 for(order = 0; (1UL << order) < goal; order++)
1776 * Only want 1024 entries max, since the table is very, very unlikely
1777 * to be larger than that.
1779 while(order && ((((1UL << order) * PAGE_SIZE) /
1780 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1784 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1785 sizeof(struct dn_rt_hash_bucket);
1786 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1788 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1789 __get_free_pages(GFP_ATOMIC, order);
1790 } while (dn_rt_hash_table == NULL && --order > 0);
1792 if (!dn_rt_hash_table)
1793 panic("Failed to allocate DECnet route cache hash table\n");
1796 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1798 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1801 for(i = 0; i <= dn_rt_hash_mask; i++) {
1802 spin_lock_init(&dn_rt_hash_table[i].lock);
1803 dn_rt_hash_table[i].chain = NULL;
1806 dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
1808 proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
1810 #ifdef CONFIG_DECNET_ROUTER
1811 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump);
1813 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
1818 void __exit dn_route_cleanup(void)
1820 del_timer(&dn_route_timer);
1823 proc_net_remove(&init_net, "decnet_cache");
1824 dst_entries_destroy(&dn_dst_ops);