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>
71 #include <linux/proc_fs.h>
72 #include <linux/seq_file.h>
73 #include <linux/init.h>
74 #include <linux/rtnetlink.h>
75 #include <linux/string.h>
76 #include <linux/netfilter_decnet.h>
77 #include <linux/rcupdate.h>
78 #include <linux/times.h>
79 #include <asm/errno.h>
80 #include <net/net_namespace.h>
81 #include <net/netlink.h>
82 #include <net/neighbour.h>
85 #include <net/fib_rules.h>
87 #include <net/dn_dev.h>
88 #include <net/dn_nsp.h>
89 #include <net/dn_route.h>
90 #include <net/dn_neigh.h>
91 #include <net/dn_fib.h>
93 struct dn_rt_hash_bucket
95 struct dn_route *chain;
97 } __attribute__((__aligned__(8)));
99 extern struct neigh_table dn_neigh_table;
102 static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
104 static const int dn_rt_min_delay = 2 * HZ;
105 static const int dn_rt_max_delay = 10 * HZ;
106 static const int dn_rt_mtu_expires = 10 * 60 * HZ;
108 static unsigned long dn_rt_deadline;
110 static int dn_dst_gc(void);
111 static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
112 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
113 static void dn_dst_link_failure(struct sk_buff *);
114 static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
115 static int dn_route_input(struct sk_buff *);
116 static void dn_run_flush(unsigned long dummy);
118 static struct dn_rt_hash_bucket *dn_rt_hash_table;
119 static unsigned dn_rt_hash_mask;
121 static struct timer_list dn_route_timer;
122 static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0);
123 int decnet_dst_gc_interval = 2;
125 static struct dst_ops dn_dst_ops = {
127 .protocol = __constant_htons(ETH_P_DNA_RT),
130 .check = dn_dst_check,
131 .negative_advice = dn_dst_negative_advice,
132 .link_failure = dn_dst_link_failure,
133 .update_pmtu = dn_dst_update_pmtu,
134 .entry_size = sizeof(struct dn_route),
135 .entries = ATOMIC_INIT(0),
138 static __inline__ unsigned dn_hash(__le16 src, __le16 dst)
140 __u16 tmp = (__u16 __force)(src ^ dst);
144 return dn_rt_hash_mask & (unsigned)tmp;
147 static inline void dnrt_free(struct dn_route *rt)
149 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
152 static inline void dnrt_drop(struct dn_route *rt)
154 dst_release(&rt->u.dst);
155 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
158 static void dn_dst_check_expire(unsigned long dummy)
161 struct dn_route *rt, **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=*rtp) != NULL) {
170 if (atomic_read(&rt->u.dst.__refcnt) ||
171 (now - rt->u.dst.lastuse) < expire) {
172 rtp = &rt->u.dst.dn_next;
175 *rtp = rt->u.dst.dn_next;
176 rt->u.dst.dn_next = NULL;
179 spin_unlock(&dn_rt_hash_table[i].lock);
181 if ((jiffies - now) > 0)
185 mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
188 static int dn_dst_gc(void)
190 struct dn_route *rt, **rtp;
192 unsigned long now = jiffies;
193 unsigned long expire = 10 * HZ;
195 for(i = 0; i <= dn_rt_hash_mask; i++) {
197 spin_lock_bh(&dn_rt_hash_table[i].lock);
198 rtp = &dn_rt_hash_table[i].chain;
200 while((rt=*rtp) != NULL) {
201 if (atomic_read(&rt->u.dst.__refcnt) ||
202 (now - rt->u.dst.lastuse) < expire) {
203 rtp = &rt->u.dst.dn_next;
206 *rtp = rt->u.dst.dn_next;
207 rt->u.dst.dn_next = NULL;
211 spin_unlock_bh(&dn_rt_hash_table[i].lock);
218 * The decnet standards don't impose a particular minimum mtu, what they
219 * do insist on is that the routing layer accepts a datagram of at least
220 * 230 bytes long. Here we have to subtract the routing header length from
221 * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
222 * assume the worst and use a long header size.
224 * We update both the mtu and the advertised mss (i.e. the segment size we
225 * advertise to the other end).
227 static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
230 struct dn_dev *dn = dst->neighbour ?
231 (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL;
233 if (dn && dn->use_long == 0)
238 if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) {
239 if (!(dst_metric_locked(dst, RTAX_MTU))) {
240 dst->metrics[RTAX_MTU-1] = mtu;
241 dst_set_expires(dst, dn_rt_mtu_expires);
243 if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
244 u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
245 if (dst->metrics[RTAX_ADVMSS-1] > mss)
246 dst->metrics[RTAX_ADVMSS-1] = mss;
252 * When a route has been marked obsolete. (e.g. routing cache flush)
254 static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
259 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
265 static void dn_dst_link_failure(struct sk_buff *skb)
270 static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
272 return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) |
273 (fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) |
274 (fl1->mark ^ fl2->mark) |
275 (fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) |
276 (fl1->oif ^ fl2->oif) |
277 (fl1->iif ^ fl2->iif)) == 0;
280 static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp)
282 struct dn_route *rth, **rthp;
283 unsigned long now = jiffies;
285 rthp = &dn_rt_hash_table[hash].chain;
287 spin_lock_bh(&dn_rt_hash_table[hash].lock);
288 while((rth = *rthp) != NULL) {
289 if (compare_keys(&rth->fl, &rt->fl)) {
291 *rthp = rth->u.dst.dn_next;
292 rcu_assign_pointer(rth->u.dst.dn_next,
293 dn_rt_hash_table[hash].chain);
294 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
297 dst_hold(&rth->u.dst);
298 rth->u.dst.lastuse = now;
299 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
305 rthp = &rth->u.dst.dn_next;
308 rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain);
309 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
311 dst_hold(&rt->u.dst);
313 rt->u.dst.lastuse = now;
314 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
319 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(&dn_rt_hash_table[i].chain, NULL)) == NULL)
328 goto nothing_to_declare;
331 next = rt->u.dst.dn_next;
332 rt->u.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;
390 /* Add back headers */
391 skb_push(skb, skb->data - skb_network_header(skb));
393 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
397 /* Skip packet length and point to flags */
399 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
405 *ptr = 0; /* Zero hop count */
407 /* Swap source and destination */
412 skb->pkt_type = PACKET_OUTGOING;
413 dn_rt_finish_output(skb, NULL, NULL);
414 return NET_RX_SUCCESS;
418 * dn_return_long - Return a long packet to its sender
419 * @skb: The long format packet to return
422 static int dn_return_long(struct sk_buff *skb)
424 struct dn_skb_cb *cb;
426 unsigned char *src_addr, *dst_addr;
427 unsigned char tmp[ETH_ALEN];
429 /* Add back all headers */
430 skb_push(skb, skb->data - skb_network_header(skb));
432 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
436 /* Ignore packet length and point to flags */
440 if (*ptr & DN_RT_F_PF) {
441 char padlen = (*ptr & ~DN_RT_F_PF);
445 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
451 *ptr = 0; /* Zero hop count */
453 /* Swap source and destination */
454 memcpy(tmp, src_addr, ETH_ALEN);
455 memcpy(src_addr, dst_addr, ETH_ALEN);
456 memcpy(dst_addr, tmp, ETH_ALEN);
458 skb->pkt_type = PACKET_OUTGOING;
459 dn_rt_finish_output(skb, dst_addr, src_addr);
460 return NET_RX_SUCCESS;
464 * dn_route_rx_packet - Try and find a route for an incoming packet
465 * @skb: The packet to find a route for
467 * Returns: result of input function if route is found, error code otherwise
469 static int dn_route_rx_packet(struct sk_buff *skb)
471 struct dn_skb_cb *cb = DN_SKB_CB(skb);
474 if ((err = dn_route_input(skb)) == 0)
475 return dst_input(skb);
477 if (decnet_debug_level & 4) {
478 char *devname = skb->dev ? skb->dev->name : "???";
479 struct dn_skb_cb *cb = DN_SKB_CB(skb);
481 "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
482 (int)cb->rt_flags, devname, skb->len,
483 dn_ntohs(cb->src), dn_ntohs(cb->dst),
487 if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
488 switch(cb->rt_flags & DN_RT_PKT_MSK) {
489 case DN_RT_PKT_SHORT:
490 return dn_return_short(skb);
492 return dn_return_long(skb);
500 static int dn_route_rx_long(struct sk_buff *skb)
502 struct dn_skb_cb *cb = DN_SKB_CB(skb);
503 unsigned char *ptr = skb->data;
505 if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
509 skb_reset_transport_header(skb);
511 /* Destination info */
513 cb->dst = dn_eth2dn(ptr);
514 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
521 cb->src = dn_eth2dn(ptr);
522 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
527 cb->hops = *ptr++; /* Visit Count */
529 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
538 static int dn_route_rx_short(struct sk_buff *skb)
540 struct dn_skb_cb *cb = DN_SKB_CB(skb);
541 unsigned char *ptr = skb->data;
543 if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
547 skb_reset_transport_header(skb);
549 cb->dst = *(__le16 *)ptr;
551 cb->src = *(__le16 *)ptr;
553 cb->hops = *ptr & 0x3f;
555 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
562 static int dn_route_discard(struct sk_buff *skb)
565 * I know we drop the packet here, but thats considered success in
569 return NET_RX_SUCCESS;
572 static int dn_route_ptp_hello(struct sk_buff *skb)
575 dn_neigh_pointopoint_hello(skb);
576 return NET_RX_SUCCESS;
579 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
581 struct dn_skb_cb *cb;
582 unsigned char flags = 0;
583 __u16 len = dn_ntohs(*(__le16 *)skb->data);
584 struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
585 unsigned char padlen = 0;
590 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
593 if (!pskb_may_pull(skb, 3))
607 cb->iif = dev->ifindex;
610 * If we have padding, remove it.
612 if (flags & DN_RT_F_PF) {
613 padlen = flags & ~DN_RT_F_PF;
614 if (!pskb_may_pull(skb, padlen + 1))
616 skb_pull(skb, padlen);
620 skb_reset_network_header(skb);
623 * Weed out future version DECnet
625 if (flags & DN_RT_F_VER)
628 cb->rt_flags = flags;
630 if (decnet_debug_level & 1)
632 "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
633 (int)flags, (dev) ? dev->name : "???", len, skb->len,
636 if (flags & DN_RT_PKT_CNTL) {
637 if (unlikely(skb_linearize(skb)))
640 switch(flags & DN_RT_CNTL_MSK) {
642 dn_dev_init_pkt(skb);
645 dn_dev_veri_pkt(skb);
649 if (dn->parms.state != DN_DEV_S_RU)
652 switch(flags & DN_RT_CNTL_MSK) {
654 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello);
658 return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard);
660 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello);
663 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello);
666 if (dn->parms.state != DN_DEV_S_RU)
669 skb_pull(skb, 1); /* Pull flags */
671 switch(flags & DN_RT_PKT_MSK) {
673 return dn_route_rx_long(skb);
674 case DN_RT_PKT_SHORT:
675 return dn_route_rx_short(skb);
685 static int dn_output(struct sk_buff *skb)
687 struct dst_entry *dst = skb->dst;
688 struct dn_route *rt = (struct dn_route *)dst;
689 struct net_device *dev = dst->dev;
690 struct dn_skb_cb *cb = DN_SKB_CB(skb);
691 struct neighbour *neigh;
695 if ((neigh = dst->neighbour) == NULL)
700 cb->src = rt->rt_saddr;
701 cb->dst = rt->rt_daddr;
704 * Always set the Intra-Ethernet bit on all outgoing packets
705 * originated on this node. Only valid flag from upper layers
706 * is return-to-sender-requested. Set hop count to 0 too.
708 cb->rt_flags &= ~DN_RT_F_RQR;
709 cb->rt_flags |= DN_RT_F_IE;
712 return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output);
716 printk(KERN_DEBUG "dn_output: This should not happen\n");
723 static int dn_forward(struct sk_buff *skb)
725 struct dn_skb_cb *cb = DN_SKB_CB(skb);
726 struct dst_entry *dst = skb->dst;
727 struct dn_dev *dn_db = dst->dev->dn_ptr;
729 struct neighbour *neigh = dst->neighbour;
731 #ifdef CONFIG_NETFILTER
732 struct net_device *dev = skb->dev;
735 if (skb->pkt_type != PACKET_HOST)
738 /* Ensure that we have enough space for headers */
739 rt = (struct dn_route *)skb->dst;
740 header_len = dn_db->use_long ? 21 : 6;
741 if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len))
745 * Hop count exceeded.
750 skb->dev = rt->u.dst.dev;
753 * If packet goes out same interface it came in on, then set
754 * the Intra-Ethernet bit. This has no effect for short
755 * packets, so we don't need to test for them here.
757 cb->rt_flags &= ~DN_RT_F_IE;
758 if (rt->rt_flags & RTCF_DOREDIRECT)
759 cb->rt_flags |= DN_RT_F_IE;
761 return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output);
769 * Drop packet. This is used for endnodes and for
770 * when we should not be forwarding packets from
773 static int dn_blackhole(struct sk_buff *skb)
780 * Used to catch bugs. This should never normally get
783 static int dn_rt_bug(struct sk_buff *skb)
785 if (net_ratelimit()) {
786 struct dn_skb_cb *cb = DN_SKB_CB(skb);
788 printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
789 dn_ntohs(cb->src), dn_ntohs(cb->dst));
797 static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
799 struct dn_fib_info *fi = res->fi;
800 struct net_device *dev = rt->u.dst.dev;
805 if (DN_FIB_RES_GW(*res) &&
806 DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
807 rt->rt_gateway = DN_FIB_RES_GW(*res);
808 memcpy(rt->u.dst.metrics, fi->fib_metrics,
809 sizeof(rt->u.dst.metrics));
811 rt->rt_type = res->type;
813 if (dev != NULL && rt->u.dst.neighbour == NULL) {
814 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
817 rt->u.dst.neighbour = n;
820 if (rt->u.dst.metrics[RTAX_MTU-1] == 0 ||
821 rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu)
822 rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
823 mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
824 if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 ||
825 rt->u.dst.metrics[RTAX_ADVMSS-1] > mss)
826 rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
830 static inline int dn_match_addr(__le16 addr1, __le16 addr2)
832 __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2);
841 static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
844 struct dn_dev *dn_db = dev->dn_ptr;
845 struct dn_ifaddr *ifa;
849 read_lock(&dev_base_lock);
850 for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
851 if (ifa->ifa_scope > scope)
854 saddr = ifa->ifa_local;
857 ret = dn_match_addr(daddr, ifa->ifa_local);
858 if (ret > best_match)
859 saddr = ifa->ifa_local;
861 saddr = ifa->ifa_local;
863 read_unlock(&dev_base_lock);
868 static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
870 return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
873 static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
875 __le16 mask = dnet_make_mask(res->prefixlen);
876 return (daddr&~mask)|res->fi->fib_nh->nh_gw;
879 static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard)
881 struct flowi fl = { .nl_u = { .dn_u =
882 { .daddr = oldflp->fld_dst,
883 .saddr = oldflp->fld_src,
884 .scope = RT_SCOPE_UNIVERSE,
886 .mark = oldflp->mark,
887 .iif = loopback_dev.ifindex,
888 .oif = oldflp->oif };
889 struct dn_route *rt = NULL;
890 struct net_device *dev_out = NULL, *dev;
891 struct neighbour *neigh = NULL;
894 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
899 if (decnet_debug_level & 16)
901 "dn_route_output_slow: dst=%04x src=%04x mark=%d"
902 " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
903 dn_ntohs(oldflp->fld_src),
904 oldflp->mark, loopback_dev.ifindex, oldflp->oif);
906 /* If we have an output interface, verify its a DECnet device */
908 dev_out = dev_get_by_index(oldflp->oif);
910 if (dev_out && dev_out->dn_ptr == NULL) {
918 /* If we have a source address, verify that its a local address */
919 if (oldflp->fld_src) {
920 err = -EADDRNOTAVAIL;
923 if (dn_dev_islocal(dev_out, oldflp->fld_src))
928 read_lock(&dev_base_lock);
929 for_each_netdev(dev) {
932 if (!dn_dev_islocal(dev, oldflp->fld_src))
934 if ((dev->flags & IFF_LOOPBACK) &&
936 !dn_dev_islocal(dev, oldflp->fld_dst))
942 read_unlock(&dev_base_lock);
950 /* No destination? Assume its local */
952 fl.fld_dst = fl.fld_src;
954 err = -EADDRNOTAVAIL;
957 dev_out = &loopback_dev;
961 fl.fld_src = dnet_select_source(dev_out, 0,
966 fl.oif = loopback_dev.ifindex;
967 res.type = RTN_LOCAL;
971 if (decnet_debug_level & 16)
973 "dn_route_output_slow: initial checks complete."
974 " dst=%o4x src=%04x oif=%d try_hard=%d\n",
975 dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src),
979 * N.B. If the kernel is compiled without router support then
980 * dn_fib_lookup() will evaluate to non-zero so this if () block
981 * will always be executed.
984 if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) {
985 struct dn_dev *dn_db;
989 * Here the fallback is basically the standard algorithm for
990 * routing in endnodes which is described in the DECnet routing
993 * If we are not trying hard, look in neighbour cache.
994 * The result is tested to ensure that if a specific output
995 * device/source address was requested, then we honour that
999 neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst);
1002 (neigh->dev->ifindex != oldflp->oif)) ||
1004 (!dn_dev_islocal(neigh->dev,
1005 oldflp->fld_src)))) {
1006 neigh_release(neigh);
1011 if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
1012 dev_out = &loopback_dev;
1013 res.type = RTN_LOCAL;
1015 dev_out = neigh->dev;
1023 /* Not there? Perhaps its a local address */
1024 if (dev_out == NULL)
1025 dev_out = dn_dev_get_default();
1027 if (dev_out == NULL)
1029 dn_db = dev_out->dn_ptr;
1030 /* Possible improvement - check all devices for local addr */
1031 if (dn_dev_islocal(dev_out, fl.fld_dst)) {
1033 dev_out = &loopback_dev;
1035 res.type = RTN_LOCAL;
1038 /* Not local either.... try sending it to the default router */
1039 neigh = neigh_clone(dn_db->router);
1040 BUG_ON(neigh && neigh->dev != dev_out);
1042 /* Ok then, we assume its directly connected and move on */
1045 gateway = ((struct dn_neigh *)neigh)->addr;
1047 gateway = fl.fld_dst;
1048 if (fl.fld_src == 0) {
1049 fl.fld_src = dnet_select_source(dev_out, gateway,
1050 res.type == RTN_LOCAL ?
1053 if (fl.fld_src == 0 && res.type != RTN_LOCAL)
1056 fl.oif = dev_out->ifindex;
1061 if (res.type == RTN_NAT)
1064 if (res.type == RTN_LOCAL) {
1066 fl.fld_src = fl.fld_dst;
1069 dev_out = &loopback_dev;
1071 fl.oif = dev_out->ifindex;
1073 dn_fib_info_put(res.fi);
1078 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1079 dn_fib_select_multipath(&fl, &res);
1082 * We could add some logic to deal with default routes here and
1083 * get rid of some of the special casing above.
1087 fl.fld_src = DN_FIB_RES_PREFSRC(res);
1091 dev_out = DN_FIB_RES_DEV(res);
1093 fl.oif = dev_out->ifindex;
1094 gateway = DN_FIB_RES_GW(res);
1097 if (dev_out->flags & IFF_LOOPBACK)
1098 flags |= RTCF_LOCAL;
1100 rt = dst_alloc(&dn_dst_ops);
1104 atomic_set(&rt->u.dst.__refcnt, 1);
1105 rt->u.dst.flags = DST_HOST;
1107 rt->fl.fld_src = oldflp->fld_src;
1108 rt->fl.fld_dst = oldflp->fld_dst;
1109 rt->fl.oif = oldflp->oif;
1111 rt->fl.mark = oldflp->mark;
1113 rt->rt_saddr = fl.fld_src;
1114 rt->rt_daddr = fl.fld_dst;
1115 rt->rt_gateway = gateway ? gateway : fl.fld_dst;
1116 rt->rt_local_src = fl.fld_src;
1118 rt->rt_dst_map = fl.fld_dst;
1119 rt->rt_src_map = fl.fld_src;
1121 rt->u.dst.dev = dev_out;
1123 rt->u.dst.neighbour = neigh;
1126 rt->u.dst.lastuse = jiffies;
1127 rt->u.dst.output = dn_output;
1128 rt->u.dst.input = dn_rt_bug;
1129 rt->rt_flags = flags;
1130 if (flags & RTCF_LOCAL)
1131 rt->u.dst.input = dn_nsp_rx;
1133 err = dn_rt_set_next_hop(rt, &res);
1137 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1138 dn_insert_route(rt, hash, (struct dn_route **)pprt);
1142 neigh_release(neigh);
1144 dn_fib_res_put(&res);
1151 err = -EADDRNOTAVAIL;
1160 dst_free(&rt->u.dst);
1166 * N.B. The flags may be moved into the flowi at some future stage.
1168 static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags)
1170 unsigned hash = dn_hash(flp->fld_src, flp->fld_dst);
1171 struct dn_route *rt = NULL;
1173 if (!(flags & MSG_TRYHARD)) {
1175 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt;
1176 rt = rcu_dereference(rt->u.dst.dn_next)) {
1177 if ((flp->fld_dst == rt->fl.fld_dst) &&
1178 (flp->fld_src == rt->fl.fld_src) &&
1179 (flp->mark == rt->fl.mark) &&
1180 (rt->fl.iif == 0) &&
1181 (rt->fl.oif == flp->oif)) {
1182 rt->u.dst.lastuse = jiffies;
1183 dst_hold(&rt->u.dst);
1185 rcu_read_unlock_bh();
1190 rcu_read_unlock_bh();
1193 return dn_route_output_slow(pprt, flp, flags);
1196 static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags)
1200 err = __dn_route_output_key(pprt, flp, flags);
1201 if (err == 0 && flp->proto) {
1202 err = xfrm_lookup(pprt, flp, NULL, 0);
1207 int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags)
1211 err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
1212 if (err == 0 && fl->proto) {
1213 err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT));
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 = { .nl_u = { .dn_u =
1233 .scope = RT_SCOPE_UNIVERSE,
1236 .iif = skb->dev->ifindex };
1237 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1243 if ((dn_db = in_dev->dn_ptr) == NULL)
1246 /* Zero source addresses are not allowed */
1247 if (fl.fld_src == 0)
1251 * In this case we've just received a packet from a source
1252 * outside ourselves pretending to come from us. We don't
1253 * allow it any further to prevent routing loops, spoofing and
1254 * other nasties. Loopback packets already have the dst attached
1255 * so this only affects packets which have originated elsewhere.
1258 if (dn_dev_islocal(in_dev, cb->src))
1261 err = dn_fib_lookup(&fl, &res);
1266 * Is the destination us ?
1268 if (!dn_dev_islocal(in_dev, cb->dst))
1271 res.type = RTN_LOCAL;
1273 __le16 src_map = fl.fld_src;
1276 out_dev = DN_FIB_RES_DEV(res);
1277 if (out_dev == NULL) {
1278 if (net_ratelimit())
1279 printk(KERN_CRIT "Bug in dn_route_input_slow() "
1280 "No output device\n");
1286 src_map = fl.fld_src; /* no NAT support for now */
1288 gateway = DN_FIB_RES_GW(res);
1289 if (res.type == RTN_NAT) {
1290 fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res);
1291 dn_fib_res_put(&res);
1293 if (dn_fib_lookup(&fl, &res))
1296 if (res.type != RTN_UNICAST)
1299 gateway = fl.fld_dst;
1301 fl.fld_src = src_map;
1307 * Forwarding check here, we only check for forwarding
1308 * being turned off, if you want to only forward intra
1309 * area, its up to you to set the routing tables up
1312 if (dn_db->parms.forwarding == 0)
1315 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1316 dn_fib_select_multipath(&fl, &res);
1319 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1320 * flag as a hint to set the intra-ethernet bit when
1321 * forwarding. If we've got NAT in operation, we don't do
1322 * this optimisation.
1324 if (out_dev == in_dev && !(flags & RTCF_NAT))
1325 flags |= RTCF_DOREDIRECT;
1327 local_src = DN_FIB_RES_PREFSRC(res);
1330 case RTN_UNREACHABLE:
1333 flags |= RTCF_LOCAL;
1334 fl.fld_src = cb->dst;
1335 fl.fld_dst = cb->src;
1337 /* Routing tables gave us a gateway */
1341 /* Packet was intra-ethernet, so we know its on-link */
1342 if (cb->rt_flags & DN_RT_F_IE) {
1344 flags |= RTCF_DIRECTSRC;
1348 /* Use the default router if there is one */
1349 neigh = neigh_clone(dn_db->router);
1351 gateway = ((struct dn_neigh *)neigh)->addr;
1355 /* Close eyes and pray */
1357 flags |= RTCF_DIRECTSRC;
1364 rt = dst_alloc(&dn_dst_ops);
1368 rt->rt_saddr = fl.fld_src;
1369 rt->rt_daddr = fl.fld_dst;
1370 rt->rt_gateway = fl.fld_dst;
1372 rt->rt_gateway = gateway;
1373 rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
1375 rt->rt_dst_map = fl.fld_dst;
1376 rt->rt_src_map = fl.fld_src;
1378 rt->fl.fld_src = cb->src;
1379 rt->fl.fld_dst = cb->dst;
1381 rt->fl.iif = in_dev->ifindex;
1382 rt->fl.mark = fl.mark;
1384 rt->u.dst.flags = DST_HOST;
1385 rt->u.dst.neighbour = neigh;
1386 rt->u.dst.dev = out_dev;
1387 rt->u.dst.lastuse = jiffies;
1388 rt->u.dst.output = dn_rt_bug;
1391 rt->u.dst.input = dn_forward;
1394 rt->u.dst.output = dn_output;
1395 rt->u.dst.input = dn_nsp_rx;
1396 rt->u.dst.dev = in_dev;
1397 flags |= RTCF_LOCAL;
1400 case RTN_UNREACHABLE:
1402 rt->u.dst.input = dn_blackhole;
1404 rt->rt_flags = flags;
1406 dev_hold(rt->u.dst.dev);
1408 err = dn_rt_set_next_hop(rt, &res);
1412 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1413 dn_insert_route(rt, hash, (struct dn_route **)&skb->dst);
1417 neigh_release(neigh);
1419 dn_fib_res_put(&res);
1435 dst_free(&rt->u.dst);
1439 int dn_route_input(struct sk_buff *skb)
1441 struct dn_route *rt;
1442 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1443 unsigned hash = dn_hash(cb->src, cb->dst);
1449 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
1450 rt = rcu_dereference(rt->u.dst.dn_next)) {
1451 if ((rt->fl.fld_src == cb->src) &&
1452 (rt->fl.fld_dst == cb->dst) &&
1453 (rt->fl.oif == 0) &&
1454 (rt->fl.mark == skb->mark) &&
1455 (rt->fl.iif == cb->iif)) {
1456 rt->u.dst.lastuse = jiffies;
1457 dst_hold(&rt->u.dst);
1460 skb->dst = (struct dst_entry *)rt;
1466 return dn_route_input_slow(skb);
1469 static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1470 int event, int nowait, unsigned int flags)
1472 struct dn_route *rt = (struct dn_route *)skb->dst;
1474 struct nlmsghdr *nlh;
1475 unsigned char *b = skb_tail_pointer(skb);
1478 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
1479 r = NLMSG_DATA(nlh);
1480 r->rtm_family = AF_DECnet;
1481 r->rtm_dst_len = 16;
1484 r->rtm_table = RT_TABLE_MAIN;
1485 RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
1486 r->rtm_type = rt->rt_type;
1487 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1488 r->rtm_scope = RT_SCOPE_UNIVERSE;
1489 r->rtm_protocol = RTPROT_UNSPEC;
1490 if (rt->rt_flags & RTCF_NOTIFY)
1491 r->rtm_flags |= RTM_F_NOTIFY;
1492 RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
1493 if (rt->fl.fld_src) {
1494 r->rtm_src_len = 16;
1495 RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src);
1498 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
1500 * Note to self - change this if input routes reverse direction when
1501 * they deal only with inputs and not with replies like they do
1504 RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src);
1505 if (rt->rt_daddr != rt->rt_gateway)
1506 RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway);
1507 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
1508 goto rtattr_failure;
1509 expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0;
1510 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, expires,
1511 rt->u.dst.error) < 0)
1512 goto rtattr_failure;
1514 RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
1516 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1526 * This is called by both endnodes and routers now.
1528 static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
1530 struct rtattr **rta = arg;
1531 struct rtmsg *rtm = NLMSG_DATA(nlh);
1532 struct dn_route *rt = NULL;
1533 struct dn_skb_cb *cb;
1535 struct sk_buff *skb;
1538 memset(&fl, 0, sizeof(fl));
1539 fl.proto = DNPROTO_NSP;
1541 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1544 skb_reset_mac_header(skb);
1545 cb = DN_SKB_CB(skb);
1548 memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2);
1550 memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2);
1552 memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1555 struct net_device *dev;
1556 if ((dev = dev_get_by_index(fl.iif)) == NULL) {
1565 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1567 cb->src = fl.fld_src;
1568 cb->dst = fl.fld_dst;
1570 err = dn_route_input(skb);
1572 memset(cb, 0, sizeof(struct dn_skb_cb));
1573 rt = (struct dn_route *)skb->dst;
1574 if (!err && -rt->u.dst.error)
1575 err = rt->u.dst.error;
1578 if (rta[RTA_OIF - 1])
1579 memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
1581 err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0);
1589 skb->dst = &rt->u.dst;
1590 if (rtm->rtm_flags & RTM_F_NOTIFY)
1591 rt->rt_flags |= RTCF_NOTIFY;
1593 err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
1602 return rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1610 * For routers, this is called from dn_fib_dump, but for endnodes its
1611 * called directly from the rtnetlink dispatch table.
1613 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1615 struct dn_route *rt;
1619 if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
1621 if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
1625 s_idx = idx = cb->args[1];
1626 for(h = 0; h <= dn_rt_hash_mask; h++) {
1632 for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0;
1634 rt = rcu_dereference(rt->u.dst.dn_next), idx++) {
1637 skb->dst = dst_clone(&rt->u.dst);
1638 if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
1639 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1640 1, NLM_F_MULTI) <= 0) {
1641 dst_release(xchg(&skb->dst, NULL));
1642 rcu_read_unlock_bh();
1645 dst_release(xchg(&skb->dst, NULL));
1647 rcu_read_unlock_bh();
1656 #ifdef CONFIG_PROC_FS
1657 struct dn_rt_cache_iter_state {
1661 static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1663 struct dn_route *rt = NULL;
1664 struct dn_rt_cache_iter_state *s = seq->private;
1666 for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1668 rt = dn_rt_hash_table[s->bucket].chain;
1671 rcu_read_unlock_bh();
1676 static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1678 struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private);
1680 rt = rt->u.dst.dn_next;
1682 rcu_read_unlock_bh();
1683 if (--s->bucket < 0)
1686 rt = dn_rt_hash_table[s->bucket].chain;
1691 static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1693 struct dn_route *rt = dn_rt_cache_get_first(seq);
1696 while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1699 return *pos ? NULL : rt;
1702 static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1704 struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1709 static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1712 rcu_read_unlock_bh();
1715 static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1717 struct dn_route *rt = v;
1718 char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1720 seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
1721 rt->u.dst.dev ? rt->u.dst.dev->name : "*",
1722 dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1),
1723 dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2),
1724 atomic_read(&rt->u.dst.__refcnt),
1726 (int) dst_metric(&rt->u.dst, RTAX_RTT));
1730 static const struct seq_operations dn_rt_cache_seq_ops = {
1731 .start = dn_rt_cache_seq_start,
1732 .next = dn_rt_cache_seq_next,
1733 .stop = dn_rt_cache_seq_stop,
1734 .show = dn_rt_cache_seq_show,
1737 static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
1739 struct seq_file *seq;
1741 struct dn_rt_cache_iter_state *s;
1743 s = kzalloc(sizeof(*s), GFP_KERNEL);
1746 rc = seq_open(file, &dn_rt_cache_seq_ops);
1749 seq = file->private_data;
1758 static const struct file_operations dn_rt_cache_seq_fops = {
1759 .owner = THIS_MODULE,
1760 .open = dn_rt_cache_seq_open,
1762 .llseek = seq_lseek,
1763 .release = seq_release_private,
1766 #endif /* CONFIG_PROC_FS */
1768 void __init dn_route_init(void)
1772 dn_dst_ops.kmem_cachep =
1773 kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
1774 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
1775 init_timer(&dn_route_timer);
1776 dn_route_timer.function = dn_dst_check_expire;
1777 dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1778 add_timer(&dn_route_timer);
1780 goal = num_physpages >> (26 - PAGE_SHIFT);
1782 for(order = 0; (1UL << order) < goal; order++)
1786 * Only want 1024 entries max, since the table is very, very unlikely
1787 * to be larger than that.
1789 while(order && ((((1UL << order) * PAGE_SIZE) /
1790 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1794 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1795 sizeof(struct dn_rt_hash_bucket);
1796 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1798 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1799 __get_free_pages(GFP_ATOMIC, order);
1800 } while (dn_rt_hash_table == NULL && --order > 0);
1802 if (!dn_rt_hash_table)
1803 panic("Failed to allocate DECnet route cache hash table\n");
1806 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1808 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1811 for(i = 0; i <= dn_rt_hash_mask; i++) {
1812 spin_lock_init(&dn_rt_hash_table[i].lock);
1813 dn_rt_hash_table[i].chain = NULL;
1816 dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
1818 proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
1820 #ifdef CONFIG_DECNET_ROUTER
1821 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump);
1823 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
1828 void __exit dn_route_cleanup(void)
1830 del_timer(&dn_route_timer);
1833 proc_net_remove(&init_net, "decnet_cache");