1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
7 * DECnet Routing Functions (Endnode and Router)
9 * Authors: Steve Whitehouse <SteveW@ACM.org>
10 * Eduardo Marcelo Serrat <emserrat@geocities.com>
13 * Steve Whitehouse : Fixes to allow "intra-ethernet" and
14 * "return-to-sender" bits on outgoing
16 * Steve Whitehouse : Timeouts for cached routes.
17 * Steve Whitehouse : Use dst cache for input routes too.
18 * Steve Whitehouse : Fixed error values in dn_send_skb.
19 * Steve Whitehouse : Rework routing functions to better fit
20 * DECnet routing design
21 * Alexey Kuznetsov : New SMP locking
22 * Steve Whitehouse : More SMP locking changes & dn_cache_dump()
23 * Steve Whitehouse : Prerouting NF hook, now really is prerouting.
24 * Fixed possible skb leak in rtnetlink funcs.
25 * Steve Whitehouse : Dave Miller's dynamic hash table sizing and
26 * Alexey Kuznetsov's finer grained locking
28 * Steve Whitehouse : Routing is now starting to look like a
29 * sensible set of code now, mainly due to
30 * my copying the IPv4 routing code. The
31 * hooks here are modified and will continue
32 * to evolve for a while.
33 * Steve Whitehouse : Real SMP at last :-) Also new netfilter
34 * stuff. Look out raw sockets your days
36 * Steve Whitehouse : Added return-to-sender functions. Added
37 * backlog congestion level return codes.
38 * Steve Whitehouse : Fixed bug where routes were set up with
39 * no ref count on net devices.
40 * Steve Whitehouse : RCU for the route cache
41 * Steve Whitehouse : Preparations for the flow cache
42 * Steve Whitehouse : Prepare for nonlinear skbs
45 /******************************************************************************
46 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
48 *******************************************************************************/
50 #include <linux/errno.h>
51 #include <linux/types.h>
52 #include <linux/socket.h>
54 #include <linux/kernel.h>
55 #include <linux/sockios.h>
56 #include <linux/net.h>
57 #include <linux/netdevice.h>
58 #include <linux/inet.h>
59 #include <linux/route.h>
60 #include <linux/in_route.h>
61 #include <linux/slab.h>
64 #include <linux/proc_fs.h>
65 #include <linux/seq_file.h>
66 #include <linux/init.h>
67 #include <linux/rtnetlink.h>
68 #include <linux/string.h>
69 #include <linux/netfilter_decnet.h>
70 #include <linux/rcupdate.h>
71 #include <linux/times.h>
72 #include <linux/export.h>
73 #include <asm/errno.h>
74 #include <net/net_namespace.h>
75 #include <net/netlink.h>
76 #include <net/neighbour.h>
79 #include <net/fib_rules.h>
81 #include <net/dn_dev.h>
82 #include <net/dn_nsp.h>
83 #include <net/dn_route.h>
84 #include <net/dn_neigh.h>
85 #include <net/dn_fib.h>
87 struct dn_rt_hash_bucket
89 struct dn_route __rcu *chain;
93 extern struct neigh_table dn_neigh_table;
96 static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
98 static const int dn_rt_min_delay = 2 * HZ;
99 static const int dn_rt_max_delay = 10 * HZ;
100 static const int dn_rt_mtu_expires = 10 * 60 * HZ;
102 static unsigned long dn_rt_deadline;
104 static int dn_dst_gc(struct dst_ops *ops);
105 static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
106 static unsigned int dn_dst_default_advmss(const struct dst_entry *dst);
107 static unsigned int dn_dst_mtu(const struct dst_entry *dst);
108 static void dn_dst_destroy(struct dst_entry *);
109 static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how);
110 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
111 static void dn_dst_link_failure(struct sk_buff *);
112 static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
113 struct sk_buff *skb , u32 mtu,
115 static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
116 struct sk_buff *skb);
117 static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
120 static int dn_route_input(struct sk_buff *);
121 static void dn_run_flush(struct timer_list *unused);
123 static struct dn_rt_hash_bucket *dn_rt_hash_table;
124 static unsigned int dn_rt_hash_mask;
126 static struct timer_list dn_route_timer;
127 static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush);
128 int decnet_dst_gc_interval = 2;
130 static struct dst_ops dn_dst_ops = {
134 .check = dn_dst_check,
135 .default_advmss = dn_dst_default_advmss,
137 .cow_metrics = dst_cow_metrics_generic,
138 .destroy = dn_dst_destroy,
139 .ifdown = dn_dst_ifdown,
140 .negative_advice = dn_dst_negative_advice,
141 .link_failure = dn_dst_link_failure,
142 .update_pmtu = dn_dst_update_pmtu,
143 .redirect = dn_dst_redirect,
144 .neigh_lookup = dn_dst_neigh_lookup,
147 static void dn_dst_destroy(struct dst_entry *dst)
149 struct dn_route *rt = (struct dn_route *) dst;
152 neigh_release(rt->n);
153 dst_destroy_metrics_generic(dst);
156 static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how)
159 struct dn_route *rt = (struct dn_route *) dst;
160 struct neighbour *n = rt->n;
162 if (n && n->dev == dev) {
163 n->dev = dev_net(dev)->loopback_dev;
170 static __inline__ unsigned int dn_hash(__le16 src, __le16 dst)
172 __u16 tmp = (__u16 __force)(src ^ dst);
176 return dn_rt_hash_mask & (unsigned int)tmp;
179 static void dn_dst_check_expire(struct timer_list *unused)
183 struct dn_route __rcu **rtp;
184 unsigned long now = jiffies;
185 unsigned long expire = 120 * HZ;
187 for (i = 0; i <= dn_rt_hash_mask; i++) {
188 rtp = &dn_rt_hash_table[i].chain;
190 spin_lock(&dn_rt_hash_table[i].lock);
191 while ((rt = rcu_dereference_protected(*rtp,
192 lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
193 if (atomic_read(&rt->dst.__refcnt) > 1 ||
194 (now - rt->dst.lastuse) < expire) {
200 dst_dev_put(&rt->dst);
201 dst_release(&rt->dst);
203 spin_unlock(&dn_rt_hash_table[i].lock);
205 if ((jiffies - now) > 0)
209 mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
212 static int dn_dst_gc(struct dst_ops *ops)
215 struct dn_route __rcu **rtp;
217 unsigned long now = jiffies;
218 unsigned long expire = 10 * HZ;
220 for (i = 0; i <= dn_rt_hash_mask; i++) {
222 spin_lock_bh(&dn_rt_hash_table[i].lock);
223 rtp = &dn_rt_hash_table[i].chain;
225 while ((rt = rcu_dereference_protected(*rtp,
226 lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
227 if (atomic_read(&rt->dst.__refcnt) > 1 ||
228 (now - rt->dst.lastuse) < expire) {
234 dst_dev_put(&rt->dst);
235 dst_release(&rt->dst);
238 spin_unlock_bh(&dn_rt_hash_table[i].lock);
245 * The decnet standards don't impose a particular minimum mtu, what they
246 * do insist on is that the routing layer accepts a datagram of at least
247 * 230 bytes long. Here we have to subtract the routing header length from
248 * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
249 * assume the worst and use a long header size.
251 * We update both the mtu and the advertised mss (i.e. the segment size we
252 * advertise to the other end).
254 static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
255 struct sk_buff *skb, u32 mtu,
258 struct dn_route *rt = (struct dn_route *) dst;
259 struct neighbour *n = rt->n;
263 dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL;
265 if (dn && dn->use_long == 0)
270 if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) {
271 if (!(dst_metric_locked(dst, RTAX_MTU))) {
272 dst_metric_set(dst, RTAX_MTU, mtu);
273 dst_set_expires(dst, dn_rt_mtu_expires);
275 if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
276 u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
277 u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS);
278 if (!existing_mss || existing_mss > mss)
279 dst_metric_set(dst, RTAX_ADVMSS, mss);
284 static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
290 * When a route has been marked obsolete. (e.g. routing cache flush)
292 static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
297 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
303 static void dn_dst_link_failure(struct sk_buff *skb)
307 static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2)
309 return ((fl1->daddr ^ fl2->daddr) |
310 (fl1->saddr ^ fl2->saddr) |
311 (fl1->flowidn_mark ^ fl2->flowidn_mark) |
312 (fl1->flowidn_scope ^ fl2->flowidn_scope) |
313 (fl1->flowidn_oif ^ fl2->flowidn_oif) |
314 (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0;
317 static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp)
319 struct dn_route *rth;
320 struct dn_route __rcu **rthp;
321 unsigned long now = jiffies;
323 rthp = &dn_rt_hash_table[hash].chain;
325 spin_lock_bh(&dn_rt_hash_table[hash].lock);
326 while ((rth = rcu_dereference_protected(*rthp,
327 lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) {
328 if (compare_keys(&rth->fld, &rt->fld)) {
330 *rthp = rth->dn_next;
331 rcu_assign_pointer(rth->dn_next,
332 dn_rt_hash_table[hash].chain);
333 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
335 dst_hold_and_use(&rth->dst, now);
336 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
338 dst_release_immediate(&rt->dst);
342 rthp = &rth->dn_next;
345 rcu_assign_pointer(rt->dn_next, dn_rt_hash_table[hash].chain);
346 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
348 dst_hold_and_use(&rt->dst, now);
349 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
354 static void dn_run_flush(struct timer_list *unused)
357 struct dn_route *rt, *next;
359 for (i = 0; i < dn_rt_hash_mask; i++) {
360 spin_lock_bh(&dn_rt_hash_table[i].lock);
362 if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL)
363 goto nothing_to_declare;
365 for(; rt; rt = next) {
366 next = rcu_dereference_raw(rt->dn_next);
367 RCU_INIT_POINTER(rt->dn_next, NULL);
368 dst_dev_put(&rt->dst);
369 dst_release(&rt->dst);
373 spin_unlock_bh(&dn_rt_hash_table[i].lock);
377 static DEFINE_SPINLOCK(dn_rt_flush_lock);
379 void dn_rt_cache_flush(int delay)
381 unsigned long now = jiffies;
382 int user_mode = !in_interrupt();
385 delay = dn_rt_min_delay;
387 spin_lock_bh(&dn_rt_flush_lock);
389 if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
390 long tmo = (long)(dn_rt_deadline - now);
392 if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
400 spin_unlock_bh(&dn_rt_flush_lock);
405 if (dn_rt_deadline == 0)
406 dn_rt_deadline = now + dn_rt_max_delay;
408 dn_rt_flush_timer.expires = now + delay;
409 add_timer(&dn_rt_flush_timer);
410 spin_unlock_bh(&dn_rt_flush_lock);
414 * dn_return_short - Return a short packet to its sender
415 * @skb: The packet to return
418 static int dn_return_short(struct sk_buff *skb)
420 struct dn_skb_cb *cb;
425 /* Add back headers */
426 skb_push(skb, skb->data - skb_network_header(skb));
428 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
432 /* Skip packet length and point to flags */
434 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
440 *ptr = 0; /* Zero hop count */
444 skb->pkt_type = PACKET_OUTGOING;
445 dn_rt_finish_output(skb, NULL, NULL);
446 return NET_RX_SUCCESS;
450 * dn_return_long - Return a long packet to its sender
451 * @skb: The long format packet to return
454 static int dn_return_long(struct sk_buff *skb)
456 struct dn_skb_cb *cb;
458 unsigned char *src_addr, *dst_addr;
459 unsigned char tmp[ETH_ALEN];
461 /* Add back all headers */
462 skb_push(skb, skb->data - skb_network_header(skb));
464 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
468 /* Ignore packet length and point to flags */
472 if (*ptr & DN_RT_F_PF) {
473 char padlen = (*ptr & ~DN_RT_F_PF);
477 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
483 *ptr = 0; /* Zero hop count */
485 /* Swap source and destination */
486 memcpy(tmp, src_addr, ETH_ALEN);
487 memcpy(src_addr, dst_addr, ETH_ALEN);
488 memcpy(dst_addr, tmp, ETH_ALEN);
490 skb->pkt_type = PACKET_OUTGOING;
491 dn_rt_finish_output(skb, dst_addr, src_addr);
492 return NET_RX_SUCCESS;
496 * dn_route_rx_packet - Try and find a route for an incoming packet
497 * @skb: The packet to find a route for
499 * Returns: result of input function if route is found, error code otherwise
501 static int dn_route_rx_packet(struct net *net, struct sock *sk, struct sk_buff *skb)
503 struct dn_skb_cb *cb;
506 if ((err = dn_route_input(skb)) == 0)
507 return dst_input(skb);
510 if (decnet_debug_level & 4) {
511 char *devname = skb->dev ? skb->dev->name : "???";
514 "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
515 (int)cb->rt_flags, devname, skb->len,
516 le16_to_cpu(cb->src), le16_to_cpu(cb->dst),
520 if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
521 switch (cb->rt_flags & DN_RT_PKT_MSK) {
522 case DN_RT_PKT_SHORT:
523 return dn_return_short(skb);
525 return dn_return_long(skb);
533 static int dn_route_rx_long(struct sk_buff *skb)
535 struct dn_skb_cb *cb = DN_SKB_CB(skb);
536 unsigned char *ptr = skb->data;
538 if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
542 skb_reset_transport_header(skb);
544 /* Destination info */
546 cb->dst = dn_eth2dn(ptr);
547 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
554 cb->src = dn_eth2dn(ptr);
555 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
560 cb->hops = *ptr++; /* Visit Count */
562 return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING,
563 &init_net, NULL, skb, skb->dev, NULL,
573 static int dn_route_rx_short(struct sk_buff *skb)
575 struct dn_skb_cb *cb = DN_SKB_CB(skb);
576 unsigned char *ptr = skb->data;
578 if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
582 skb_reset_transport_header(skb);
584 cb->dst = *(__le16 *)ptr;
586 cb->src = *(__le16 *)ptr;
588 cb->hops = *ptr & 0x3f;
590 return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING,
591 &init_net, NULL, skb, skb->dev, NULL,
599 static int dn_route_discard(struct net *net, struct sock *sk, struct sk_buff *skb)
602 * I know we drop the packet here, but thats considered success in
606 return NET_RX_SUCCESS;
609 static int dn_route_ptp_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
612 dn_neigh_pointopoint_hello(skb);
613 return NET_RX_SUCCESS;
616 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
618 struct dn_skb_cb *cb;
619 unsigned char flags = 0;
620 __u16 len = le16_to_cpu(*(__le16 *)skb->data);
621 struct dn_dev *dn = rcu_dereference(dev->dn_ptr);
622 unsigned char padlen = 0;
624 if (!net_eq(dev_net(dev), &init_net))
630 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
633 if (!pskb_may_pull(skb, 3))
647 cb->iif = dev->ifindex;
650 * If we have padding, remove it.
652 if (flags & DN_RT_F_PF) {
653 padlen = flags & ~DN_RT_F_PF;
654 if (!pskb_may_pull(skb, padlen + 1))
656 skb_pull(skb, padlen);
660 skb_reset_network_header(skb);
663 * Weed out future version DECnet
665 if (flags & DN_RT_F_VER)
668 cb->rt_flags = flags;
670 if (decnet_debug_level & 1)
672 "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
673 (int)flags, (dev) ? dev->name : "???", len, skb->len,
676 if (flags & DN_RT_PKT_CNTL) {
677 if (unlikely(skb_linearize(skb)))
680 switch (flags & DN_RT_CNTL_MSK) {
682 dn_dev_init_pkt(skb);
685 dn_dev_veri_pkt(skb);
689 if (dn->parms.state != DN_DEV_S_RU)
692 switch (flags & DN_RT_CNTL_MSK) {
694 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
695 &init_net, NULL, skb, skb->dev, NULL,
700 return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE,
701 &init_net, NULL, skb, skb->dev, NULL,
704 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
705 &init_net, NULL, skb, skb->dev, NULL,
706 dn_neigh_router_hello);
709 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
710 &init_net, NULL, skb, skb->dev, NULL,
711 dn_neigh_endnode_hello);
714 if (dn->parms.state != DN_DEV_S_RU)
717 skb_pull(skb, 1); /* Pull flags */
719 switch (flags & DN_RT_PKT_MSK) {
721 return dn_route_rx_long(skb);
722 case DN_RT_PKT_SHORT:
723 return dn_route_rx_short(skb);
733 static int dn_output(struct net *net, struct sock *sk, struct sk_buff *skb)
735 struct dst_entry *dst = skb_dst(skb);
736 struct dn_route *rt = (struct dn_route *)dst;
737 struct net_device *dev = dst->dev;
738 struct dn_skb_cb *cb = DN_SKB_CB(skb);
747 cb->src = rt->rt_saddr;
748 cb->dst = rt->rt_daddr;
751 * Always set the Intra-Ethernet bit on all outgoing packets
752 * originated on this node. Only valid flag from upper layers
753 * is return-to-sender-requested. Set hop count to 0 too.
755 cb->rt_flags &= ~DN_RT_F_RQR;
756 cb->rt_flags |= DN_RT_F_IE;
759 return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT,
760 &init_net, sk, skb, NULL, dev,
764 net_dbg_ratelimited("dn_output: This should not happen\n");
771 static int dn_forward(struct sk_buff *skb)
773 struct dn_skb_cb *cb = DN_SKB_CB(skb);
774 struct dst_entry *dst = skb_dst(skb);
775 struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
778 struct net_device *dev = skb->dev;
780 if (skb->pkt_type != PACKET_HOST)
783 /* Ensure that we have enough space for headers */
784 rt = (struct dn_route *)skb_dst(skb);
785 header_len = dn_db->use_long ? 21 : 6;
786 if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len))
790 * Hop count exceeded.
795 skb->dev = rt->dst.dev;
798 * If packet goes out same interface it came in on, then set
799 * the Intra-Ethernet bit. This has no effect for short
800 * packets, so we don't need to test for them here.
802 cb->rt_flags &= ~DN_RT_F_IE;
803 if (rt->rt_flags & RTCF_DOREDIRECT)
804 cb->rt_flags |= DN_RT_F_IE;
806 return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD,
807 &init_net, NULL, skb, dev, skb->dev,
816 * Used to catch bugs. This should never normally get
819 static int dn_rt_bug_out(struct net *net, struct sock *sk, struct sk_buff *skb)
821 struct dn_skb_cb *cb = DN_SKB_CB(skb);
823 net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
824 le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
831 static int dn_rt_bug(struct sk_buff *skb)
833 struct dn_skb_cb *cb = DN_SKB_CB(skb);
835 net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
836 le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
843 static unsigned int dn_dst_default_advmss(const struct dst_entry *dst)
845 return dn_mss_from_pmtu(dst->dev, dst_mtu(dst));
848 static unsigned int dn_dst_mtu(const struct dst_entry *dst)
850 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
852 return mtu ? : dst->dev->mtu;
855 static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
859 return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev);
862 static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
864 struct dn_fib_info *fi = res->fi;
865 struct net_device *dev = rt->dst.dev;
866 unsigned int mss_metric;
870 if (DN_FIB_RES_GW(*res) &&
871 DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
872 rt->rt_gateway = DN_FIB_RES_GW(*res);
873 dst_init_metrics(&rt->dst, fi->fib_metrics, true);
875 rt->rt_type = res->type;
877 if (dev != NULL && rt->n == NULL) {
878 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
884 if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu)
885 dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu);
886 mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS);
888 unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst));
889 if (mss_metric > mss)
890 dst_metric_set(&rt->dst, RTAX_ADVMSS, mss);
895 static inline int dn_match_addr(__le16 addr1, __le16 addr2)
897 __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2);
906 static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
909 struct dn_dev *dn_db;
910 struct dn_ifaddr *ifa;
915 dn_db = rcu_dereference(dev->dn_ptr);
916 for (ifa = rcu_dereference(dn_db->ifa_list);
918 ifa = rcu_dereference(ifa->ifa_next)) {
919 if (ifa->ifa_scope > scope)
922 saddr = ifa->ifa_local;
925 ret = dn_match_addr(daddr, ifa->ifa_local);
926 if (ret > best_match)
927 saddr = ifa->ifa_local;
929 saddr = ifa->ifa_local;
936 static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
938 return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
941 static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
943 __le16 mask = dnet_make_mask(res->prefixlen);
944 return (daddr&~mask)|res->fi->fib_nh->nh_gw;
947 static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard)
949 struct flowidn fld = {
950 .daddr = oldflp->daddr,
951 .saddr = oldflp->saddr,
952 .flowidn_scope = RT_SCOPE_UNIVERSE,
953 .flowidn_mark = oldflp->flowidn_mark,
954 .flowidn_iif = LOOPBACK_IFINDEX,
955 .flowidn_oif = oldflp->flowidn_oif,
957 struct dn_route *rt = NULL;
958 struct net_device *dev_out = NULL, *dev;
959 struct neighbour *neigh = NULL;
961 unsigned int flags = 0;
962 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
967 if (decnet_debug_level & 16)
969 "dn_route_output_slow: dst=%04x src=%04x mark=%d"
970 " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr),
971 le16_to_cpu(oldflp->saddr),
972 oldflp->flowidn_mark, LOOPBACK_IFINDEX,
973 oldflp->flowidn_oif);
975 /* If we have an output interface, verify its a DECnet device */
976 if (oldflp->flowidn_oif) {
977 dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif);
979 if (dev_out && dev_out->dn_ptr == NULL) {
987 /* If we have a source address, verify that its a local address */
989 err = -EADDRNOTAVAIL;
992 if (dn_dev_islocal(dev_out, oldflp->saddr))
998 for_each_netdev_rcu(&init_net, dev) {
1001 if (!dn_dev_islocal(dev, oldflp->saddr))
1003 if ((dev->flags & IFF_LOOPBACK) &&
1005 !dn_dev_islocal(dev, oldflp->daddr))
1012 if (dev_out == NULL)
1019 /* No destination? Assume its local */
1021 fld.daddr = fld.saddr;
1026 dev_out = init_net.loopback_dev;
1027 if (!dev_out->dn_ptr)
1029 err = -EADDRNOTAVAIL;
1033 fld.saddr = dnet_select_source(dev_out, 0,
1038 fld.flowidn_oif = LOOPBACK_IFINDEX;
1039 res.type = RTN_LOCAL;
1043 if (decnet_debug_level & 16)
1045 "dn_route_output_slow: initial checks complete."
1046 " dst=%04x src=%04x oif=%d try_hard=%d\n",
1047 le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr),
1048 fld.flowidn_oif, try_hard);
1051 * N.B. If the kernel is compiled without router support then
1052 * dn_fib_lookup() will evaluate to non-zero so this if () block
1053 * will always be executed.
1056 if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) {
1057 struct dn_dev *dn_db;
1061 * Here the fallback is basically the standard algorithm for
1062 * routing in endnodes which is described in the DECnet routing
1065 * If we are not trying hard, look in neighbour cache.
1066 * The result is tested to ensure that if a specific output
1067 * device/source address was requested, then we honour that
1071 neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr);
1073 if ((oldflp->flowidn_oif &&
1074 (neigh->dev->ifindex != oldflp->flowidn_oif)) ||
1076 (!dn_dev_islocal(neigh->dev,
1078 neigh_release(neigh);
1083 if (dn_dev_islocal(neigh->dev, fld.daddr)) {
1084 dev_out = init_net.loopback_dev;
1085 res.type = RTN_LOCAL;
1087 dev_out = neigh->dev;
1095 /* Not there? Perhaps its a local address */
1096 if (dev_out == NULL)
1097 dev_out = dn_dev_get_default();
1099 if (dev_out == NULL)
1101 dn_db = rcu_dereference_raw(dev_out->dn_ptr);
1104 /* Possible improvement - check all devices for local addr */
1105 if (dn_dev_islocal(dev_out, fld.daddr)) {
1107 dev_out = init_net.loopback_dev;
1109 res.type = RTN_LOCAL;
1112 /* Not local either.... try sending it to the default router */
1113 neigh = neigh_clone(dn_db->router);
1114 BUG_ON(neigh && neigh->dev != dev_out);
1116 /* Ok then, we assume its directly connected and move on */
1119 gateway = ((struct dn_neigh *)neigh)->addr;
1121 gateway = fld.daddr;
1122 if (fld.saddr == 0) {
1123 fld.saddr = dnet_select_source(dev_out, gateway,
1124 res.type == RTN_LOCAL ?
1127 if (fld.saddr == 0 && res.type != RTN_LOCAL)
1130 fld.flowidn_oif = dev_out->ifindex;
1135 if (res.type == RTN_NAT)
1138 if (res.type == RTN_LOCAL) {
1140 fld.saddr = fld.daddr;
1143 dev_out = init_net.loopback_dev;
1145 if (!dev_out->dn_ptr)
1147 fld.flowidn_oif = dev_out->ifindex;
1149 dn_fib_info_put(res.fi);
1154 if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
1155 dn_fib_select_multipath(&fld, &res);
1158 * We could add some logic to deal with default routes here and
1159 * get rid of some of the special casing above.
1163 fld.saddr = DN_FIB_RES_PREFSRC(res);
1167 dev_out = DN_FIB_RES_DEV(res);
1169 fld.flowidn_oif = dev_out->ifindex;
1170 gateway = DN_FIB_RES_GW(res);
1173 if (dev_out->flags & IFF_LOOPBACK)
1174 flags |= RTCF_LOCAL;
1176 rt = dst_alloc(&dn_dst_ops, dev_out, 0, DST_OBSOLETE_NONE, DST_HOST);
1181 memset(&rt->fld, 0, sizeof(rt->fld));
1182 rt->fld.saddr = oldflp->saddr;
1183 rt->fld.daddr = oldflp->daddr;
1184 rt->fld.flowidn_oif = oldflp->flowidn_oif;
1185 rt->fld.flowidn_iif = 0;
1186 rt->fld.flowidn_mark = oldflp->flowidn_mark;
1188 rt->rt_saddr = fld.saddr;
1189 rt->rt_daddr = fld.daddr;
1190 rt->rt_gateway = gateway ? gateway : fld.daddr;
1191 rt->rt_local_src = fld.saddr;
1193 rt->rt_dst_map = fld.daddr;
1194 rt->rt_src_map = fld.saddr;
1199 rt->dst.lastuse = jiffies;
1200 rt->dst.output = dn_output;
1201 rt->dst.input = dn_rt_bug;
1202 rt->rt_flags = flags;
1203 if (flags & RTCF_LOCAL)
1204 rt->dst.input = dn_nsp_rx;
1206 err = dn_rt_set_next_hop(rt, &res);
1210 hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
1211 /* dn_insert_route() increments dst->__refcnt */
1212 dn_insert_route(rt, hash, (struct dn_route **)pprt);
1216 neigh_release(neigh);
1218 dn_fib_res_put(&res);
1225 err = -EADDRNOTAVAIL;
1234 dst_release_immediate(&rt->dst);
1240 * N.B. The flags may be moved into the flowi at some future stage.
1242 static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags)
1244 unsigned int hash = dn_hash(flp->saddr, flp->daddr);
1245 struct dn_route *rt = NULL;
1247 if (!(flags & MSG_TRYHARD)) {
1249 for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt;
1250 rt = rcu_dereference_bh(rt->dn_next)) {
1251 if ((flp->daddr == rt->fld.daddr) &&
1252 (flp->saddr == rt->fld.saddr) &&
1253 (flp->flowidn_mark == rt->fld.flowidn_mark) &&
1254 dn_is_output_route(rt) &&
1255 (rt->fld.flowidn_oif == flp->flowidn_oif)) {
1256 dst_hold_and_use(&rt->dst, jiffies);
1257 rcu_read_unlock_bh();
1262 rcu_read_unlock_bh();
1265 return dn_route_output_slow(pprt, flp, flags);
1268 static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags)
1272 err = __dn_route_output_key(pprt, flp, flags);
1273 if (err == 0 && flp->flowidn_proto) {
1274 *pprt = xfrm_lookup(&init_net, *pprt,
1275 flowidn_to_flowi(flp), NULL, 0);
1276 if (IS_ERR(*pprt)) {
1277 err = PTR_ERR(*pprt);
1284 int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *fl, struct sock *sk, int flags)
1288 err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
1289 if (err == 0 && fl->flowidn_proto) {
1290 *pprt = xfrm_lookup(&init_net, *pprt,
1291 flowidn_to_flowi(fl), sk, 0);
1292 if (IS_ERR(*pprt)) {
1293 err = PTR_ERR(*pprt);
1300 static int dn_route_input_slow(struct sk_buff *skb)
1302 struct dn_route *rt = NULL;
1303 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1304 struct net_device *in_dev = skb->dev;
1305 struct net_device *out_dev = NULL;
1306 struct dn_dev *dn_db;
1307 struct neighbour *neigh = NULL;
1311 __le16 local_src = 0;
1312 struct flowidn fld = {
1315 .flowidn_scope = RT_SCOPE_UNIVERSE,
1316 .flowidn_mark = skb->mark,
1317 .flowidn_iif = skb->dev->ifindex,
1319 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1325 if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL)
1328 /* Zero source addresses are not allowed */
1333 * In this case we've just received a packet from a source
1334 * outside ourselves pretending to come from us. We don't
1335 * allow it any further to prevent routing loops, spoofing and
1336 * other nasties. Loopback packets already have the dst attached
1337 * so this only affects packets which have originated elsewhere.
1340 if (dn_dev_islocal(in_dev, cb->src))
1343 err = dn_fib_lookup(&fld, &res);
1348 * Is the destination us ?
1350 if (!dn_dev_islocal(in_dev, cb->dst))
1353 res.type = RTN_LOCAL;
1355 __le16 src_map = fld.saddr;
1358 out_dev = DN_FIB_RES_DEV(res);
1359 if (out_dev == NULL) {
1360 net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n");
1366 src_map = fld.saddr; /* no NAT support for now */
1368 gateway = DN_FIB_RES_GW(res);
1369 if (res.type == RTN_NAT) {
1370 fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res);
1371 dn_fib_res_put(&res);
1373 if (dn_fib_lookup(&fld, &res))
1376 if (res.type != RTN_UNICAST)
1379 gateway = fld.daddr;
1381 fld.saddr = src_map;
1387 * Forwarding check here, we only check for forwarding
1388 * being turned off, if you want to only forward intra
1389 * area, its up to you to set the routing tables up
1392 if (dn_db->parms.forwarding == 0)
1395 if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
1396 dn_fib_select_multipath(&fld, &res);
1399 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1400 * flag as a hint to set the intra-ethernet bit when
1401 * forwarding. If we've got NAT in operation, we don't do
1402 * this optimisation.
1404 if (out_dev == in_dev && !(flags & RTCF_NAT))
1405 flags |= RTCF_DOREDIRECT;
1407 local_src = DN_FIB_RES_PREFSRC(res);
1410 case RTN_UNREACHABLE:
1413 flags |= RTCF_LOCAL;
1414 fld.saddr = cb->dst;
1415 fld.daddr = cb->src;
1417 /* Routing tables gave us a gateway */
1421 /* Packet was intra-ethernet, so we know its on-link */
1422 if (cb->rt_flags & DN_RT_F_IE) {
1427 /* Use the default router if there is one */
1428 neigh = neigh_clone(dn_db->router);
1430 gateway = ((struct dn_neigh *)neigh)->addr;
1434 /* Close eyes and pray */
1442 rt = dst_alloc(&dn_dst_ops, out_dev, 1, DST_OBSOLETE_NONE, DST_HOST);
1447 memset(&rt->fld, 0, sizeof(rt->fld));
1448 rt->rt_saddr = fld.saddr;
1449 rt->rt_daddr = fld.daddr;
1450 rt->rt_gateway = fld.daddr;
1452 rt->rt_gateway = gateway;
1453 rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
1455 rt->rt_dst_map = fld.daddr;
1456 rt->rt_src_map = fld.saddr;
1458 rt->fld.saddr = cb->src;
1459 rt->fld.daddr = cb->dst;
1460 rt->fld.flowidn_oif = 0;
1461 rt->fld.flowidn_iif = in_dev->ifindex;
1462 rt->fld.flowidn_mark = fld.flowidn_mark;
1465 rt->dst.lastuse = jiffies;
1466 rt->dst.output = dn_rt_bug_out;
1469 rt->dst.input = dn_forward;
1472 rt->dst.output = dn_output;
1473 rt->dst.input = dn_nsp_rx;
1474 rt->dst.dev = in_dev;
1475 flags |= RTCF_LOCAL;
1478 case RTN_UNREACHABLE:
1480 rt->dst.input = dst_discard;
1482 rt->rt_flags = flags;
1484 err = dn_rt_set_next_hop(rt, &res);
1488 hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
1489 /* dn_insert_route() increments dst->__refcnt */
1490 dn_insert_route(rt, hash, &rt);
1491 skb_dst_set(skb, &rt->dst);
1495 neigh_release(neigh);
1497 dn_fib_res_put(&res);
1513 dst_release_immediate(&rt->dst);
1517 static int dn_route_input(struct sk_buff *skb)
1519 struct dn_route *rt;
1520 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1521 unsigned int hash = dn_hash(cb->src, cb->dst);
1527 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
1528 rt = rcu_dereference(rt->dn_next)) {
1529 if ((rt->fld.saddr == cb->src) &&
1530 (rt->fld.daddr == cb->dst) &&
1531 (rt->fld.flowidn_oif == 0) &&
1532 (rt->fld.flowidn_mark == skb->mark) &&
1533 (rt->fld.flowidn_iif == cb->iif)) {
1534 dst_hold_and_use(&rt->dst, jiffies);
1536 skb_dst_set(skb, (struct dst_entry *)rt);
1542 return dn_route_input_slow(skb);
1545 static int dn_rt_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1546 int event, int nowait, unsigned int flags)
1548 struct dn_route *rt = (struct dn_route *)skb_dst(skb);
1550 struct nlmsghdr *nlh;
1553 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags);
1557 r = nlmsg_data(nlh);
1558 r->rtm_family = AF_DECnet;
1559 r->rtm_dst_len = 16;
1562 r->rtm_table = RT_TABLE_MAIN;
1563 r->rtm_type = rt->rt_type;
1564 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1565 r->rtm_scope = RT_SCOPE_UNIVERSE;
1566 r->rtm_protocol = RTPROT_UNSPEC;
1568 if (rt->rt_flags & RTCF_NOTIFY)
1569 r->rtm_flags |= RTM_F_NOTIFY;
1571 if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 ||
1572 nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0)
1575 if (rt->fld.saddr) {
1576 r->rtm_src_len = 16;
1577 if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0)
1581 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0)
1585 * Note to self - change this if input routes reverse direction when
1586 * they deal only with inputs and not with replies like they do
1589 if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0)
1592 if (rt->rt_daddr != rt->rt_gateway &&
1593 nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0)
1596 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
1599 expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
1600 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires,
1604 if (dn_is_input_route(rt) &&
1605 nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0)
1608 nlmsg_end(skb, nlh);
1612 nlmsg_cancel(skb, nlh);
1616 const struct nla_policy rtm_dn_policy[RTA_MAX + 1] = {
1617 [RTA_DST] = { .type = NLA_U16 },
1618 [RTA_SRC] = { .type = NLA_U16 },
1619 [RTA_IIF] = { .type = NLA_U32 },
1620 [RTA_OIF] = { .type = NLA_U32 },
1621 [RTA_GATEWAY] = { .type = NLA_U16 },
1622 [RTA_PRIORITY] = { .type = NLA_U32 },
1623 [RTA_PREFSRC] = { .type = NLA_U16 },
1624 [RTA_METRICS] = { .type = NLA_NESTED },
1625 [RTA_MULTIPATH] = { .type = NLA_NESTED },
1626 [RTA_TABLE] = { .type = NLA_U32 },
1627 [RTA_MARK] = { .type = NLA_U32 },
1631 * This is called by both endnodes and routers now.
1633 static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1634 struct netlink_ext_ack *extack)
1636 struct net *net = sock_net(in_skb->sk);
1637 struct rtmsg *rtm = nlmsg_data(nlh);
1638 struct dn_route *rt = NULL;
1639 struct dn_skb_cb *cb;
1641 struct sk_buff *skb;
1643 struct nlattr *tb[RTA_MAX+1];
1645 if (!net_eq(net, &init_net))
1648 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
1649 rtm_dn_policy, extack);
1653 memset(&fld, 0, sizeof(fld));
1654 fld.flowidn_proto = DNPROTO_NSP;
1656 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1659 skb_reset_mac_header(skb);
1660 cb = DN_SKB_CB(skb);
1663 fld.saddr = nla_get_le16(tb[RTA_SRC]);
1666 fld.daddr = nla_get_le16(tb[RTA_DST]);
1669 fld.flowidn_iif = nla_get_u32(tb[RTA_IIF]);
1671 if (fld.flowidn_iif) {
1672 struct net_device *dev;
1673 dev = __dev_get_by_index(&init_net, fld.flowidn_iif);
1674 if (!dev || !dev->dn_ptr) {
1678 skb->protocol = htons(ETH_P_DNA_RT);
1680 cb->src = fld.saddr;
1681 cb->dst = fld.daddr;
1683 err = dn_route_input(skb);
1685 memset(cb, 0, sizeof(struct dn_skb_cb));
1686 rt = (struct dn_route *)skb_dst(skb);
1687 if (!err && -rt->dst.error)
1688 err = rt->dst.error;
1691 fld.flowidn_oif = nla_get_u32(tb[RTA_OIF]);
1693 err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0);
1699 skb_dst_set(skb, &rt->dst);
1700 if (rtm->rtm_flags & RTM_F_NOTIFY)
1701 rt->rt_flags |= RTCF_NOTIFY;
1703 err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
1709 return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).portid);
1717 * For routers, this is called from dn_fib_dump, but for endnodes its
1718 * called directly from the rtnetlink dispatch table.
1720 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1722 struct net *net = sock_net(skb->sk);
1723 struct dn_route *rt;
1728 if (!net_eq(net, &init_net))
1731 if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg))
1734 rtm = nlmsg_data(cb->nlh);
1735 if (!(rtm->rtm_flags & RTM_F_CLONED))
1739 s_idx = idx = cb->args[1];
1740 for(h = 0; h <= dn_rt_hash_mask; h++) {
1746 for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0;
1748 rt = rcu_dereference_bh(rt->dn_next), idx++) {
1751 skb_dst_set(skb, dst_clone(&rt->dst));
1752 if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).portid,
1753 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1754 1, NLM_F_MULTI) < 0) {
1756 rcu_read_unlock_bh();
1761 rcu_read_unlock_bh();
1770 #ifdef CONFIG_PROC_FS
1771 struct dn_rt_cache_iter_state {
1775 static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1777 struct dn_route *rt = NULL;
1778 struct dn_rt_cache_iter_state *s = seq->private;
1780 for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1782 rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
1785 rcu_read_unlock_bh();
1790 static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1792 struct dn_rt_cache_iter_state *s = seq->private;
1794 rt = rcu_dereference_bh(rt->dn_next);
1796 rcu_read_unlock_bh();
1797 if (--s->bucket < 0)
1800 rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
1805 static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1807 struct dn_route *rt = dn_rt_cache_get_first(seq);
1810 while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1813 return *pos ? NULL : rt;
1816 static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1818 struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1823 static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1826 rcu_read_unlock_bh();
1829 static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1831 struct dn_route *rt = v;
1832 char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1834 seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
1835 rt->dst.dev ? rt->dst.dev->name : "*",
1836 dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1),
1837 dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2),
1838 atomic_read(&rt->dst.__refcnt),
1843 static const struct seq_operations dn_rt_cache_seq_ops = {
1844 .start = dn_rt_cache_seq_start,
1845 .next = dn_rt_cache_seq_next,
1846 .stop = dn_rt_cache_seq_stop,
1847 .show = dn_rt_cache_seq_show,
1849 #endif /* CONFIG_PROC_FS */
1851 void __init dn_route_init(void)
1855 dn_dst_ops.kmem_cachep =
1856 kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
1857 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
1858 dst_entries_init(&dn_dst_ops);
1859 timer_setup(&dn_route_timer, dn_dst_check_expire, 0);
1860 dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1861 add_timer(&dn_route_timer);
1863 goal = totalram_pages() >> (26 - PAGE_SHIFT);
1865 for(order = 0; (1UL << order) < goal; order++)
1869 * Only want 1024 entries max, since the table is very, very unlikely
1870 * to be larger than that.
1872 while(order && ((((1UL << order) * PAGE_SIZE) /
1873 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1877 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1878 sizeof(struct dn_rt_hash_bucket);
1879 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1881 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1882 __get_free_pages(GFP_ATOMIC, order);
1883 } while (dn_rt_hash_table == NULL && --order > 0);
1885 if (!dn_rt_hash_table)
1886 panic("Failed to allocate DECnet route cache hash table\n");
1889 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1891 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1894 for(i = 0; i <= dn_rt_hash_mask; i++) {
1895 spin_lock_init(&dn_rt_hash_table[i].lock);
1896 dn_rt_hash_table[i].chain = NULL;
1899 dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
1901 proc_create_seq_private("decnet_cache", 0444, init_net.proc_net,
1902 &dn_rt_cache_seq_ops,
1903 sizeof(struct dn_rt_cache_iter_state), NULL);
1905 #ifdef CONFIG_DECNET_ROUTER
1906 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE,
1907 dn_cache_getroute, dn_fib_dump, 0);
1909 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE,
1910 dn_cache_getroute, dn_cache_dump, 0);
1914 void __exit dn_route_cleanup(void)
1916 del_timer(&dn_route_timer);
1919 remove_proc_entry("decnet_cache", init_net.proc_net);
1920 dst_entries_destroy(&dn_dst_ops);