blob: fe32388ea24f7cc6811ea17ee3fb8d9f47042ee7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
5 *
6 * DECnet Routing Functions (Endnode and Router)
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Fixes to allow "intra-ethernet" and
13 * "return-to-sender" bits on outgoing
14 * packets.
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
26 * from ipv4/route.c.
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
34 * are numbered!
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
42 */
43
44/******************************************************************************
45 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +090046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 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
50 any later version.
51
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*******************************************************************************/
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/errno.h>
59#include <linux/types.h>
60#include <linux/socket.h>
61#include <linux/in.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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090069#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <net/sock.h>
71#include <linux/mm.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>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040080#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <asm/errno.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020082#include <net/net_namespace.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070083#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#include <net/neighbour.h>
85#include <net/dst.h>
86#include <net/flow.h>
Steven Whitehousea8731cb2006-08-09 15:56:46 -070087#include <net/fib_rules.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070088#include <net/dn.h>
89#include <net/dn_dev.h>
90#include <net/dn_nsp.h>
91#include <net/dn_route.h>
92#include <net/dn_neigh.h>
93#include <net/dn_fib.h>
94
95struct dn_rt_hash_bucket
96{
Eric Dumazetfc766e4c2010-10-29 03:09:24 +000097 struct dn_route __rcu *chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 spinlock_t lock;
Eric Dumazetfca09fb2008-02-07 23:29:57 -080099};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101extern struct neigh_table dn_neigh_table;
102
103
104static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
105
106static const int dn_rt_min_delay = 2 * HZ;
107static const int dn_rt_max_delay = 10 * HZ;
108static const int dn_rt_mtu_expires = 10 * 60 * HZ;
109
110static unsigned long dn_rt_deadline;
111
Daniel Lezcano569d3642008-01-18 03:56:57 -0800112static int dn_dst_gc(struct dst_ops *ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
David S. Miller0dbaee32010-12-13 12:52:14 -0800114static unsigned int dn_dst_default_advmss(const struct dst_entry *dst);
Steffen Klassertebb762f2011-11-23 02:12:51 +0000115static unsigned int dn_dst_mtu(const struct dst_entry *dst);
David S. Miller62fa8a82011-01-26 20:51:05 -0800116static void dn_dst_destroy(struct dst_entry *);
David S. Millerfccd7d52012-07-02 22:22:18 -0700117static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
119static void dn_dst_link_failure(struct sk_buff *);
David S. Miller6700c272012-07-17 03:29:28 -0700120static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
121 struct sk_buff *skb , u32 mtu);
122static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
123 struct sk_buff *skb);
David S. Millerf894cbf2012-07-02 21:52:24 -0700124static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
125 struct sk_buff *skb,
126 const void *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127static int dn_route_input(struct sk_buff *);
128static void dn_run_flush(unsigned long dummy);
129
130static struct dn_rt_hash_bucket *dn_rt_hash_table;
Eric Dumazet95c96172012-04-15 05:58:06 +0000131static unsigned int dn_rt_hash_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133static struct timer_list dn_route_timer;
Ingo Molnar8d06afa2005-09-09 13:10:40 -0700134static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135int decnet_dst_gc_interval = 2;
136
137static struct dst_ops dn_dst_ops = {
138 .family = PF_DECnet,
Harvey Harrison09640e62009-02-01 00:45:17 -0800139 .protocol = cpu_to_be16(ETH_P_DNA_RT),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 .gc_thresh = 128,
141 .gc = dn_dst_gc,
142 .check = dn_dst_check,
David S. Miller0dbaee32010-12-13 12:52:14 -0800143 .default_advmss = dn_dst_default_advmss,
Steffen Klassertebb762f2011-11-23 02:12:51 +0000144 .mtu = dn_dst_mtu,
David S. Miller62fa8a82011-01-26 20:51:05 -0800145 .cow_metrics = dst_cow_metrics_generic,
146 .destroy = dn_dst_destroy,
David S. Millerfccd7d52012-07-02 22:22:18 -0700147 .ifdown = dn_dst_ifdown,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 .negative_advice = dn_dst_negative_advice,
149 .link_failure = dn_dst_link_failure,
150 .update_pmtu = dn_dst_update_pmtu,
David S. Millerb587ee32012-07-12 00:39:24 -0700151 .redirect = dn_dst_redirect,
David S. Millerd3aaeb32011-07-18 00:40:17 -0700152 .neigh_lookup = dn_dst_neigh_lookup,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153};
154
David S. Miller62fa8a82011-01-26 20:51:05 -0800155static void dn_dst_destroy(struct dst_entry *dst)
156{
David S. Millerfccd7d52012-07-02 22:22:18 -0700157 struct dn_route *rt = (struct dn_route *) dst;
158
159 if (rt->n)
160 neigh_release(rt->n);
David S. Miller62fa8a82011-01-26 20:51:05 -0800161 dst_destroy_metrics_generic(dst);
162}
163
David S. Millerfccd7d52012-07-02 22:22:18 -0700164static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how)
165{
166 if (how) {
167 struct dn_route *rt = (struct dn_route *) dst;
168 struct neighbour *n = rt->n;
169
170 if (n && n->dev == dev) {
171 n->dev = dev_net(dev)->loopback_dev;
172 dev_hold(n->dev);
173 dev_put(dev);
174 }
175 }
176}
177
Eric Dumazet95c96172012-04-15 05:58:06 +0000178static __inline__ unsigned int dn_hash(__le16 src, __le16 dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800180 __u16 tmp = (__u16 __force)(src ^ dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 tmp ^= (tmp >> 3);
182 tmp ^= (tmp >> 5);
183 tmp ^= (tmp >> 10);
Eric Dumazet95c96172012-04-15 05:58:06 +0000184 return dn_rt_hash_mask & (unsigned int)tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
187static inline void dnrt_free(struct dn_route *rt)
188{
Changli Gaod8d1f302010-06-10 23:31:35 -0700189 call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192static inline void dnrt_drop(struct dn_route *rt)
193{
Changli Gaod8d1f302010-06-10 23:31:35 -0700194 dst_release(&rt->dst);
195 call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
198static void dn_dst_check_expire(unsigned long dummy)
199{
200 int i;
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000201 struct dn_route *rt;
202 struct dn_route __rcu **rtp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 unsigned long now = jiffies;
204 unsigned long expire = 120 * HZ;
205
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000206 for (i = 0; i <= dn_rt_hash_mask; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 rtp = &dn_rt_hash_table[i].chain;
208
209 spin_lock(&dn_rt_hash_table[i].lock);
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000210 while ((rt = rcu_dereference_protected(*rtp,
211 lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700212 if (atomic_read(&rt->dst.__refcnt) ||
213 (now - rt->dst.lastuse) < expire) {
214 rtp = &rt->dst.dn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 continue;
216 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700217 *rtp = rt->dst.dn_next;
218 rt->dst.dn_next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 dnrt_free(rt);
220 }
221 spin_unlock(&dn_rt_hash_table[i].lock);
222
223 if ((jiffies - now) > 0)
224 break;
225 }
226
227 mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
228}
229
Daniel Lezcano569d3642008-01-18 03:56:57 -0800230static int dn_dst_gc(struct dst_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000232 struct dn_route *rt;
233 struct dn_route __rcu **rtp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 int i;
235 unsigned long now = jiffies;
236 unsigned long expire = 10 * HZ;
237
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000238 for (i = 0; i <= dn_rt_hash_mask; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 spin_lock_bh(&dn_rt_hash_table[i].lock);
241 rtp = &dn_rt_hash_table[i].chain;
242
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000243 while ((rt = rcu_dereference_protected(*rtp,
244 lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
Changli Gaod8d1f302010-06-10 23:31:35 -0700245 if (atomic_read(&rt->dst.__refcnt) ||
246 (now - rt->dst.lastuse) < expire) {
247 rtp = &rt->dst.dn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 continue;
249 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700250 *rtp = rt->dst.dn_next;
251 rt->dst.dn_next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 dnrt_drop(rt);
253 break;
254 }
255 spin_unlock_bh(&dn_rt_hash_table[i].lock);
256 }
257
258 return 0;
259}
260
261/*
262 * The decnet standards don't impose a particular minimum mtu, what they
263 * do insist on is that the routing layer accepts a datagram of at least
264 * 230 bytes long. Here we have to subtract the routing header length from
265 * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
266 * assume the worst and use a long header size.
267 *
268 * We update both the mtu and the advertised mss (i.e. the segment size we
269 * advertise to the other end).
270 */
David S. Miller6700c272012-07-17 03:29:28 -0700271static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
272 struct sk_buff *skb, u32 mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
David S. Millerfccd7d52012-07-02 22:22:18 -0700274 struct dn_route *rt = (struct dn_route *) dst;
275 struct neighbour *n = rt->n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 u32 min_mtu = 230;
David S. Miller69cce1d2011-07-17 23:09:49 -0700277 struct dn_dev *dn;
278
279 dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 if (dn && dn->use_long == 0)
282 min_mtu -= 6;
283 else
284 min_mtu -= 21;
285
Satoru SATOH5ffc02a2008-05-04 22:14:42 -0700286 if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 if (!(dst_metric_locked(dst, RTAX_MTU))) {
David S. Millerdefb3512010-12-08 21:16:57 -0800288 dst_metric_set(dst, RTAX_MTU, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 dst_set_expires(dst, dn_rt_mtu_expires);
290 }
291 if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
292 u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
David S. Miller0dbaee32010-12-13 12:52:14 -0800293 u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS);
294 if (!existing_mss || existing_mss > mss)
David S. Millerdefb3512010-12-08 21:16:57 -0800295 dst_metric_set(dst, RTAX_ADVMSS, mss);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 }
297 }
298}
299
David S. Miller6700c272012-07-17 03:29:28 -0700300static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
301 struct sk_buff *skb)
David S. Millerb587ee32012-07-12 00:39:24 -0700302{
303}
304
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900305/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 * When a route has been marked obsolete. (e.g. routing cache flush)
307 */
308static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
309{
310 return NULL;
311}
312
313static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
314{
315 dst_release(dst);
316 return NULL;
317}
318
319static void dn_dst_link_failure(struct sk_buff *skb)
320{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321}
322
David S. Millerbef55ae2011-03-12 17:17:10 -0500323static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
David S. Millerbef55ae2011-03-12 17:17:10 -0500325 return ((fl1->daddr ^ fl2->daddr) |
326 (fl1->saddr ^ fl2->saddr) |
327 (fl1->flowidn_mark ^ fl2->flowidn_mark) |
328 (fl1->flowidn_scope ^ fl2->flowidn_scope) |
329 (fl1->flowidn_oif ^ fl2->flowidn_oif) |
330 (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331}
332
Eric Dumazet95c96172012-04-15 05:58:06 +0000333static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000335 struct dn_route *rth;
336 struct dn_route __rcu **rthp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 unsigned long now = jiffies;
338
339 rthp = &dn_rt_hash_table[hash].chain;
340
341 spin_lock_bh(&dn_rt_hash_table[hash].lock);
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000342 while ((rth = rcu_dereference_protected(*rthp,
343 lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) {
David S. Millerbef55ae2011-03-12 17:17:10 -0500344 if (compare_keys(&rth->fld, &rt->fld)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 /* Put it first */
Changli Gaod8d1f302010-06-10 23:31:35 -0700346 *rthp = rth->dst.dn_next;
347 rcu_assign_pointer(rth->dst.dn_next,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 dn_rt_hash_table[hash].chain);
349 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
350
Changli Gaod8d1f302010-06-10 23:31:35 -0700351 dst_use(&rth->dst, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
353
354 dnrt_drop(rt);
355 *rp = rth;
356 return 0;
357 }
Changli Gaod8d1f302010-06-10 23:31:35 -0700358 rthp = &rth->dst.dn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 }
360
Changli Gaod8d1f302010-06-10 23:31:35 -0700361 rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900363
Changli Gaod8d1f302010-06-10 23:31:35 -0700364 dst_use(&rt->dst, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
366 *rp = rt;
367 return 0;
368}
369
Roel Kluin5eaa65b2008-12-10 15:18:31 -0800370static void dn_run_flush(unsigned long dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
372 int i;
373 struct dn_route *rt, *next;
374
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000375 for (i = 0; i < dn_rt_hash_mask; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 spin_lock_bh(&dn_rt_hash_table[i].lock);
377
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000378 if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 goto nothing_to_declare;
380
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000381 for(; rt; rt = next) {
382 next = rcu_dereference_raw(rt->dst.dn_next);
383 RCU_INIT_POINTER(rt->dst.dn_next, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 dst_free((struct dst_entry *)rt);
385 }
386
387nothing_to_declare:
388 spin_unlock_bh(&dn_rt_hash_table[i].lock);
389 }
390}
391
392static DEFINE_SPINLOCK(dn_rt_flush_lock);
393
394void dn_rt_cache_flush(int delay)
395{
396 unsigned long now = jiffies;
397 int user_mode = !in_interrupt();
398
399 if (delay < 0)
400 delay = dn_rt_min_delay;
401
402 spin_lock_bh(&dn_rt_flush_lock);
403
404 if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
405 long tmo = (long)(dn_rt_deadline - now);
406
407 if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
408 tmo = 0;
409
410 if (delay > tmo)
411 delay = tmo;
412 }
413
414 if (delay <= 0) {
415 spin_unlock_bh(&dn_rt_flush_lock);
416 dn_run_flush(0);
417 return;
418 }
419
420 if (dn_rt_deadline == 0)
421 dn_rt_deadline = now + dn_rt_max_delay;
422
423 dn_rt_flush_timer.expires = now + delay;
424 add_timer(&dn_rt_flush_timer);
425 spin_unlock_bh(&dn_rt_flush_lock);
426}
427
428/**
429 * dn_return_short - Return a short packet to its sender
430 * @skb: The packet to return
431 *
432 */
433static int dn_return_short(struct sk_buff *skb)
434{
435 struct dn_skb_cb *cb;
436 unsigned char *ptr;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800437 __le16 *src;
438 __le16 *dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 /* Add back headers */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700441 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
444 return NET_RX_DROP;
445
446 cb = DN_SKB_CB(skb);
447 /* Skip packet length and point to flags */
448 ptr = skb->data + 2;
449 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
450
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800451 dst = (__le16 *)ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800453 src = (__le16 *)ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 ptr += 2;
455 *ptr = 0; /* Zero hop count */
456
Ilpo Järvinena0bffff2009-03-21 13:36:17 -0700457 swap(*src, *dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459 skb->pkt_type = PACKET_OUTGOING;
460 dn_rt_finish_output(skb, NULL, NULL);
461 return NET_RX_SUCCESS;
462}
463
464/**
465 * dn_return_long - Return a long packet to its sender
466 * @skb: The long format packet to return
467 *
468 */
469static int dn_return_long(struct sk_buff *skb)
470{
471 struct dn_skb_cb *cb;
472 unsigned char *ptr;
473 unsigned char *src_addr, *dst_addr;
474 unsigned char tmp[ETH_ALEN];
475
476 /* Add back all headers */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700477 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
480 return NET_RX_DROP;
481
482 cb = DN_SKB_CB(skb);
483 /* Ignore packet length and point to flags */
484 ptr = skb->data + 2;
485
486 /* Skip padding */
487 if (*ptr & DN_RT_F_PF) {
488 char padlen = (*ptr & ~DN_RT_F_PF);
489 ptr += padlen;
490 }
491
492 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
493 ptr += 2;
494 dst_addr = ptr;
495 ptr += 8;
496 src_addr = ptr;
497 ptr += 6;
498 *ptr = 0; /* Zero hop count */
499
500 /* Swap source and destination */
501 memcpy(tmp, src_addr, ETH_ALEN);
502 memcpy(src_addr, dst_addr, ETH_ALEN);
503 memcpy(dst_addr, tmp, ETH_ALEN);
504
505 skb->pkt_type = PACKET_OUTGOING;
506 dn_rt_finish_output(skb, dst_addr, src_addr);
507 return NET_RX_SUCCESS;
508}
509
510/**
511 * dn_route_rx_packet - Try and find a route for an incoming packet
512 * @skb: The packet to find a route for
513 *
514 * Returns: result of input function if route is found, error code otherwise
515 */
516static int dn_route_rx_packet(struct sk_buff *skb)
517{
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000518 struct dn_skb_cb *cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 int err;
520
521 if ((err = dn_route_input(skb)) == 0)
522 return dst_input(skb);
523
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000524 cb = DN_SKB_CB(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (decnet_debug_level & 4) {
526 char *devname = skb->dev ? skb->dev->name : "???";
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 printk(KERN_DEBUG
529 "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800530 (int)cb->rt_flags, devname, skb->len,
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800531 le16_to_cpu(cb->src), le16_to_cpu(cb->dst),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 err, skb->pkt_type);
533 }
534
535 if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
Joe Perches06f8fe12011-07-01 09:43:03 +0000536 switch (cb->rt_flags & DN_RT_PKT_MSK) {
537 case DN_RT_PKT_SHORT:
538 return dn_return_short(skb);
539 case DN_RT_PKT_LONG:
540 return dn_return_long(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 }
542 }
543
544 kfree_skb(skb);
545 return NET_RX_DROP;
546}
547
548static int dn_route_rx_long(struct sk_buff *skb)
549{
550 struct dn_skb_cb *cb = DN_SKB_CB(skb);
551 unsigned char *ptr = skb->data;
552
553 if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
554 goto drop_it;
555
556 skb_pull(skb, 20);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300557 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900559 /* Destination info */
560 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800561 cb->dst = dn_eth2dn(ptr);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900562 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
563 goto drop_it;
564 ptr += 6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900567 /* Source info */
568 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800569 cb->src = dn_eth2dn(ptr);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900570 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
571 goto drop_it;
572 ptr += 6;
573 /* Other junk */
574 ptr++;
575 cb->hops = *ptr++; /* Visit Count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Jan Engelhardt5d877d82010-03-23 04:09:14 +0100577 return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL,
578 dn_route_rx_packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580drop_it:
581 kfree_skb(skb);
582 return NET_RX_DROP;
583}
584
585
586
587static int dn_route_rx_short(struct sk_buff *skb)
588{
589 struct dn_skb_cb *cb = DN_SKB_CB(skb);
590 unsigned char *ptr = skb->data;
591
592 if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
593 goto drop_it;
594
595 skb_pull(skb, 5);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300596 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800598 cb->dst = *(__le16 *)ptr;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900599 ptr += 2;
600 cb->src = *(__le16 *)ptr;
601 ptr += 2;
602 cb->hops = *ptr & 0x3f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Jan Engelhardt5d877d82010-03-23 04:09:14 +0100604 return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL,
605 dn_route_rx_packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
607drop_it:
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900608 kfree_skb(skb);
609 return NET_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610}
611
612static int dn_route_discard(struct sk_buff *skb)
613{
614 /*
615 * I know we drop the packet here, but thats considered success in
616 * this case
617 */
618 kfree_skb(skb);
619 return NET_RX_SUCCESS;
620}
621
622static int dn_route_ptp_hello(struct sk_buff *skb)
623{
624 dn_dev_hello(skb);
625 dn_neigh_pointopoint_hello(skb);
626 return NET_RX_SUCCESS;
627}
628
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700629int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630{
631 struct dn_skb_cb *cb;
632 unsigned char flags = 0;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800633 __u16 len = le16_to_cpu(*(__le16 *)skb->data);
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000634 struct dn_dev *dn = rcu_dereference(dev->dn_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 unsigned char padlen = 0;
636
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700637 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -0700638 goto dump_it;
639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 if (dn == NULL)
641 goto dump_it;
642
643 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
644 goto out;
645
646 if (!pskb_may_pull(skb, 3))
647 goto dump_it;
648
649 skb_pull(skb, 2);
650
651 if (len > skb->len)
652 goto dump_it;
653
654 skb_trim(skb, len);
655
656 flags = *skb->data;
657
658 cb = DN_SKB_CB(skb);
659 cb->stamp = jiffies;
660 cb->iif = dev->ifindex;
661
662 /*
663 * If we have padding, remove it.
664 */
665 if (flags & DN_RT_F_PF) {
666 padlen = flags & ~DN_RT_F_PF;
667 if (!pskb_may_pull(skb, padlen + 1))
668 goto dump_it;
669 skb_pull(skb, padlen);
670 flags = *skb->data;
671 }
672
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700673 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
675 /*
676 * Weed out future version DECnet
677 */
678 if (flags & DN_RT_F_VER)
679 goto dump_it;
680
681 cb->rt_flags = flags;
682
683 if (decnet_debug_level & 1)
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900684 printk(KERN_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900686 (int)flags, (dev) ? dev->name : "???", len, skb->len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 padlen);
688
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900689 if (flags & DN_RT_PKT_CNTL) {
Herbert Xu364c6ba2006-06-09 16:10:40 -0700690 if (unlikely(skb_linearize(skb)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 goto dump_it;
692
Joe Perches06f8fe12011-07-01 09:43:03 +0000693 switch (flags & DN_RT_CNTL_MSK) {
694 case DN_RT_PKT_INIT:
695 dn_dev_init_pkt(skb);
696 break;
697 case DN_RT_PKT_VERI:
698 dn_dev_veri_pkt(skb);
699 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 }
701
702 if (dn->parms.state != DN_DEV_S_RU)
703 goto dump_it;
704
Joe Perches06f8fe12011-07-01 09:43:03 +0000705 switch (flags & DN_RT_CNTL_MSK) {
706 case DN_RT_PKT_HELO:
707 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
708 skb, skb->dev, NULL,
709 dn_route_ptp_hello);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
Joe Perches06f8fe12011-07-01 09:43:03 +0000711 case DN_RT_PKT_L1RT:
712 case DN_RT_PKT_L2RT:
713 return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE,
714 skb, skb->dev, NULL,
715 dn_route_discard);
716 case DN_RT_PKT_ERTH:
717 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
718 skb, skb->dev, NULL,
719 dn_neigh_router_hello);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Joe Perches06f8fe12011-07-01 09:43:03 +0000721 case DN_RT_PKT_EEDH:
722 return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
723 skb, skb->dev, NULL,
724 dn_neigh_endnode_hello);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900725 }
726 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 if (dn->parms.state != DN_DEV_S_RU)
728 goto dump_it;
729
730 skb_pull(skb, 1); /* Pull flags */
731
Joe Perches06f8fe12011-07-01 09:43:03 +0000732 switch (flags & DN_RT_PKT_MSK) {
733 case DN_RT_PKT_LONG:
734 return dn_route_rx_long(skb);
735 case DN_RT_PKT_SHORT:
736 return dn_route_rx_short(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 }
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900738 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
740dump_it:
741 kfree_skb(skb);
742out:
743 return NET_RX_DROP;
744}
745
David S. Miller8f40b162011-07-17 13:34:11 -0700746static int dn_to_neigh_output(struct sk_buff *skb)
747{
748 struct dst_entry *dst = skb_dst(skb);
David S. Millerfccd7d52012-07-02 22:22:18 -0700749 struct dn_route *rt = (struct dn_route *) dst;
750 struct neighbour *n = rt->n;
David S. Miller8f40b162011-07-17 13:34:11 -0700751
752 return n->output(n, skb);
753}
754
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755static int dn_output(struct sk_buff *skb)
756{
Eric Dumazetadf30902009-06-02 05:19:30 +0000757 struct dst_entry *dst = skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 struct dn_route *rt = (struct dn_route *)dst;
759 struct net_device *dev = dst->dev;
760 struct dn_skb_cb *cb = DN_SKB_CB(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
762 int err = -EINVAL;
763
David S. Millerfccd7d52012-07-02 22:22:18 -0700764 if (rt->n == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 goto error;
766
767 skb->dev = dev;
768
769 cb->src = rt->rt_saddr;
770 cb->dst = rt->rt_daddr;
771
772 /*
773 * Always set the Intra-Ethernet bit on all outgoing packets
774 * originated on this node. Only valid flag from upper layers
775 * is return-to-sender-requested. Set hop count to 0 too.
776 */
777 cb->rt_flags &= ~DN_RT_F_RQR;
778 cb->rt_flags |= DN_RT_F_IE;
779 cb->hops = 0;
780
Jan Engelhardt5d877d82010-03-23 04:09:14 +0100781 return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev,
David S. Miller8f40b162011-07-17 13:34:11 -0700782 dn_to_neigh_output);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784error:
Joe Perchese87cc472012-05-13 21:56:26 +0000785 net_dbg_ratelimited("dn_output: This should not happen\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 kfree_skb(skb);
788
789 return err;
790}
791
792static int dn_forward(struct sk_buff *skb)
793{
794 struct dn_skb_cb *cb = DN_SKB_CB(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000795 struct dst_entry *dst = skb_dst(skb);
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000796 struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 struct dn_route *rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 int header_len;
799#ifdef CONFIG_NETFILTER
800 struct net_device *dev = skb->dev;
801#endif
802
803 if (skb->pkt_type != PACKET_HOST)
804 goto drop;
805
806 /* Ensure that we have enough space for headers */
Eric Dumazetadf30902009-06-02 05:19:30 +0000807 rt = (struct dn_route *)skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 header_len = dn_db->use_long ? 21 : 6;
Changli Gaod8d1f302010-06-10 23:31:35 -0700809 if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 goto drop;
811
812 /*
813 * Hop count exceeded.
814 */
815 if (++cb->hops > 30)
816 goto drop;
817
Changli Gaod8d1f302010-06-10 23:31:35 -0700818 skb->dev = rt->dst.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 /*
821 * If packet goes out same interface it came in on, then set
822 * the Intra-Ethernet bit. This has no effect for short
823 * packets, so we don't need to test for them here.
824 */
825 cb->rt_flags &= ~DN_RT_F_IE;
826 if (rt->rt_flags & RTCF_DOREDIRECT)
827 cb->rt_flags |= DN_RT_F_IE;
828
Jan Engelhardt5d877d82010-03-23 04:09:14 +0100829 return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev,
David S. Miller8f40b162011-07-17 13:34:11 -0700830 dn_to_neigh_output);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832drop:
833 kfree_skb(skb);
834 return NET_RX_DROP;
835}
836
837/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 * Used to catch bugs. This should never normally get
839 * called.
840 */
841static int dn_rt_bug(struct sk_buff *skb)
842{
Joe Perchese87cc472012-05-13 21:56:26 +0000843 struct dn_skb_cb *cb = DN_SKB_CB(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
Joe Perchese87cc472012-05-13 21:56:26 +0000845 net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
846 le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
848 kfree_skb(skb);
849
Florian Westphal0e8635a2009-06-20 00:53:25 +0000850 return NET_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851}
852
David S. Miller0dbaee32010-12-13 12:52:14 -0800853static unsigned int dn_dst_default_advmss(const struct dst_entry *dst)
854{
855 return dn_mss_from_pmtu(dst->dev, dst_mtu(dst));
856}
857
Steffen Klassertebb762f2011-11-23 02:12:51 +0000858static unsigned int dn_dst_mtu(const struct dst_entry *dst)
David S. Millerd33e4552010-12-14 13:01:14 -0800859{
Steffen Klassert618f9bc2011-11-23 02:13:31 +0000860 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
861
862 return mtu ? : dst->dev->mtu;
David S. Millerd33e4552010-12-14 13:01:14 -0800863}
864
David S. Millerf894cbf2012-07-02 21:52:24 -0700865static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
866 struct sk_buff *skb,
867 const void *daddr)
David S. Millerd3aaeb32011-07-18 00:40:17 -0700868{
869 return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev);
870}
871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
873{
874 struct dn_fib_info *fi = res->fi;
Changli Gaod8d1f302010-06-10 23:31:35 -0700875 struct net_device *dev = rt->dst.dev;
David S. Miller62fa8a82011-01-26 20:51:05 -0800876 unsigned int mss_metric;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 struct neighbour *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
879 if (fi) {
880 if (DN_FIB_RES_GW(*res) &&
881 DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
882 rt->rt_gateway = DN_FIB_RES_GW(*res);
David S. Miller62fa8a82011-01-26 20:51:05 -0800883 dst_init_metrics(&rt->dst, fi->fib_metrics, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 }
885 rt->rt_type = res->type;
886
David S. Millerfccd7d52012-07-02 22:22:18 -0700887 if (dev != NULL && rt->n == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
889 if (IS_ERR(n))
890 return PTR_ERR(n);
David S. Millerfccd7d52012-07-02 22:22:18 -0700891 rt->n = n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
893
David S. Millerd33e4552010-12-14 13:01:14 -0800894 if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu)
David S. Millerdefb3512010-12-08 21:16:57 -0800895 dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu);
David S. Miller62fa8a82011-01-26 20:51:05 -0800896 mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS);
897 if (mss_metric) {
David S. Miller0dbaee32010-12-13 12:52:14 -0800898 unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst));
David S. Miller62fa8a82011-01-26 20:51:05 -0800899 if (mss_metric > mss)
David S. Miller0dbaee32010-12-13 12:52:14 -0800900 dst_metric_set(&rt->dst, RTAX_ADVMSS, mss);
901 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 return 0;
903}
904
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800905static inline int dn_match_addr(__le16 addr1, __le16 addr2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906{
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800907 __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 int match = 16;
909 while(tmp) {
910 tmp >>= 1;
911 match--;
912 }
913 return match;
914}
915
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800916static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917{
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800918 __le16 saddr = 0;
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000919 struct dn_dev *dn_db;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 struct dn_ifaddr *ifa;
921 int best_match = 0;
922 int ret;
923
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000924 rcu_read_lock();
925 dn_db = rcu_dereference(dev->dn_ptr);
926 for (ifa = rcu_dereference(dn_db->ifa_list);
927 ifa != NULL;
928 ifa = rcu_dereference(ifa->ifa_next)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 if (ifa->ifa_scope > scope)
930 continue;
931 if (!daddr) {
932 saddr = ifa->ifa_local;
933 break;
934 }
935 ret = dn_match_addr(daddr, ifa->ifa_local);
936 if (ret > best_match)
937 saddr = ifa->ifa_local;
938 if (best_match == 0)
939 saddr = ifa->ifa_local;
940 }
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000941 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 return saddr;
944}
945
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800946static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947{
948 return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
949}
950
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800951static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952{
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800953 __le16 mask = dnet_make_mask(res->prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 return (daddr&~mask)|res->fi->fib_nh->nh_gw;
955}
956
David S. Millerbef55ae2011-03-12 17:17:10 -0500957static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958{
David S. Millerbef55ae2011-03-12 17:17:10 -0500959 struct flowidn fld = {
960 .daddr = oldflp->daddr,
961 .saddr = oldflp->saddr,
962 .flowidn_scope = RT_SCOPE_UNIVERSE,
963 .flowidn_mark = oldflp->flowidn_mark,
Pavel Emelyanov1fb94892012-08-08 21:53:36 +0000964 .flowidn_iif = LOOPBACK_IFINDEX,
David S. Millerbef55ae2011-03-12 17:17:10 -0500965 .flowidn_oif = oldflp->flowidn_oif,
David S. Miller1d28f422011-03-12 00:29:39 -0500966 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 struct dn_route *rt = NULL;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700968 struct net_device *dev_out = NULL, *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 struct neighbour *neigh = NULL;
Eric Dumazet95c96172012-04-15 05:58:06 +0000970 unsigned int hash;
971 unsigned int flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
973 int err;
974 int free_res = 0;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800975 __le16 gateway = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
977 if (decnet_debug_level & 16)
978 printk(KERN_DEBUG
979 "dn_route_output_slow: dst=%04x src=%04x mark=%d"
David S. Millerbef55ae2011-03-12 17:17:10 -0500980 " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr),
981 le16_to_cpu(oldflp->saddr),
Pavel Emelyanov1fb94892012-08-08 21:53:36 +0000982 oldflp->flowidn_mark, LOOPBACK_IFINDEX,
David S. Millerbef55ae2011-03-12 17:17:10 -0500983 oldflp->flowidn_oif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985 /* If we have an output interface, verify its a DECnet device */
David S. Millerbef55ae2011-03-12 17:17:10 -0500986 if (oldflp->flowidn_oif) {
987 dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 err = -ENODEV;
989 if (dev_out && dev_out->dn_ptr == NULL) {
990 dev_put(dev_out);
991 dev_out = NULL;
992 }
993 if (dev_out == NULL)
994 goto out;
995 }
996
997 /* If we have a source address, verify that its a local address */
David S. Millerbef55ae2011-03-12 17:17:10 -0500998 if (oldflp->saddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 err = -EADDRNOTAVAIL;
1000
1001 if (dev_out) {
David S. Millerbef55ae2011-03-12 17:17:10 -05001002 if (dn_dev_islocal(dev_out, oldflp->saddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 goto source_ok;
1004 dev_put(dev_out);
1005 goto out;
1006 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -08001007 rcu_read_lock();
1008 for_each_netdev_rcu(&init_net, dev) {
Pavel Emelianov7562f872007-05-03 15:13:45 -07001009 if (!dev->dn_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 continue;
David S. Millerbef55ae2011-03-12 17:17:10 -05001011 if (!dn_dev_islocal(dev, oldflp->saddr))
Patrick Caulfield9bbf28a12006-08-02 14:14:44 -07001012 continue;
Pavel Emelianov7562f872007-05-03 15:13:45 -07001013 if ((dev->flags & IFF_LOOPBACK) &&
David S. Millerbef55ae2011-03-12 17:17:10 -05001014 oldflp->daddr &&
1015 !dn_dev_islocal(dev, oldflp->daddr))
Patrick Caulfield9bbf28a12006-08-02 14:14:44 -07001016 continue;
Pavel Emelianov7562f872007-05-03 15:13:45 -07001017
1018 dev_out = dev;
Patrick Caulfield9bbf28a12006-08-02 14:14:44 -07001019 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -08001021 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 if (dev_out == NULL)
1023 goto out;
1024 dev_hold(dev_out);
1025source_ok:
1026 ;
1027 }
1028
1029 /* No destination? Assume its local */
David S. Millerbef55ae2011-03-12 17:17:10 -05001030 if (!fld.daddr) {
1031 fld.daddr = fld.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032
1033 err = -EADDRNOTAVAIL;
1034 if (dev_out)
1035 dev_put(dev_out);
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001036 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 dev_hold(dev_out);
David S. Millerbef55ae2011-03-12 17:17:10 -05001038 if (!fld.daddr) {
1039 fld.daddr =
1040 fld.saddr = dnet_select_source(dev_out, 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 RT_SCOPE_HOST);
David S. Millerbef55ae2011-03-12 17:17:10 -05001042 if (!fld.daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 goto out;
1044 }
Pavel Emelyanov1fb94892012-08-08 21:53:36 +00001045 fld.flowidn_oif = LOOPBACK_IFINDEX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 res.type = RTN_LOCAL;
1047 goto make_route;
1048 }
1049
1050 if (decnet_debug_level & 16)
1051 printk(KERN_DEBUG
1052 "dn_route_output_slow: initial checks complete."
Steven Whitehousec4ea94a2006-03-20 22:42:39 -08001053 " dst=%o4x src=%04x oif=%d try_hard=%d\n",
David S. Millerbef55ae2011-03-12 17:17:10 -05001054 le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr),
1055 fld.flowidn_oif, try_hard);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
1057 /*
1058 * N.B. If the kernel is compiled without router support then
1059 * dn_fib_lookup() will evaluate to non-zero so this if () block
1060 * will always be executed.
1061 */
1062 err = -ESRCH;
David S. Millerbef55ae2011-03-12 17:17:10 -05001063 if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 struct dn_dev *dn_db;
1065 if (err != -ESRCH)
1066 goto out;
1067 /*
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001068 * Here the fallback is basically the standard algorithm for
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 * routing in endnodes which is described in the DECnet routing
1070 * docs
1071 *
1072 * If we are not trying hard, look in neighbour cache.
1073 * The result is tested to ensure that if a specific output
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001074 * device/source address was requested, then we honour that
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 * here
1076 */
1077 if (!try_hard) {
David S. Millerbef55ae2011-03-12 17:17:10 -05001078 neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 if (neigh) {
David S. Millerbef55ae2011-03-12 17:17:10 -05001080 if ((oldflp->flowidn_oif &&
1081 (neigh->dev->ifindex != oldflp->flowidn_oif)) ||
1082 (oldflp->saddr &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 (!dn_dev_islocal(neigh->dev,
David S. Millerbef55ae2011-03-12 17:17:10 -05001084 oldflp->saddr)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 neigh_release(neigh);
1086 neigh = NULL;
1087 } else {
1088 if (dev_out)
1089 dev_put(dev_out);
David S. Millerbef55ae2011-03-12 17:17:10 -05001090 if (dn_dev_islocal(neigh->dev, fld.daddr)) {
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001091 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 res.type = RTN_LOCAL;
1093 } else {
1094 dev_out = neigh->dev;
1095 }
1096 dev_hold(dev_out);
1097 goto select_source;
1098 }
1099 }
1100 }
1101
1102 /* Not there? Perhaps its a local address */
1103 if (dev_out == NULL)
1104 dev_out = dn_dev_get_default();
1105 err = -ENODEV;
1106 if (dev_out == NULL)
1107 goto out;
Eric Dumazetfc766e4c2010-10-29 03:09:24 +00001108 dn_db = rcu_dereference_raw(dev_out->dn_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 /* Possible improvement - check all devices for local addr */
David S. Millerbef55ae2011-03-12 17:17:10 -05001110 if (dn_dev_islocal(dev_out, fld.daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 dev_put(dev_out);
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001112 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 dev_hold(dev_out);
1114 res.type = RTN_LOCAL;
1115 goto select_source;
1116 }
1117 /* Not local either.... try sending it to the default router */
1118 neigh = neigh_clone(dn_db->router);
1119 BUG_ON(neigh && neigh->dev != dev_out);
1120
1121 /* Ok then, we assume its directly connected and move on */
1122select_source:
1123 if (neigh)
1124 gateway = ((struct dn_neigh *)neigh)->addr;
1125 if (gateway == 0)
David S. Millerbef55ae2011-03-12 17:17:10 -05001126 gateway = fld.daddr;
1127 if (fld.saddr == 0) {
1128 fld.saddr = dnet_select_source(dev_out, gateway,
1129 res.type == RTN_LOCAL ?
1130 RT_SCOPE_HOST :
1131 RT_SCOPE_LINK);
1132 if (fld.saddr == 0 && res.type != RTN_LOCAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 goto e_addr;
1134 }
David S. Millerbef55ae2011-03-12 17:17:10 -05001135 fld.flowidn_oif = dev_out->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 goto make_route;
1137 }
1138 free_res = 1;
1139
1140 if (res.type == RTN_NAT)
1141 goto e_inval;
1142
1143 if (res.type == RTN_LOCAL) {
David S. Millerbef55ae2011-03-12 17:17:10 -05001144 if (!fld.saddr)
1145 fld.saddr = fld.daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 if (dev_out)
1147 dev_put(dev_out);
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001148 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 dev_hold(dev_out);
David S. Millerbef55ae2011-03-12 17:17:10 -05001150 fld.flowidn_oif = dev_out->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 if (res.fi)
1152 dn_fib_info_put(res.fi);
1153 res.fi = NULL;
1154 goto make_route;
1155 }
1156
David S. Millerbef55ae2011-03-12 17:17:10 -05001157 if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
1158 dn_fib_select_multipath(&fld, &res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001160 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 * We could add some logic to deal with default routes here and
1162 * get rid of some of the special casing above.
1163 */
1164
David S. Millerbef55ae2011-03-12 17:17:10 -05001165 if (!fld.saddr)
1166 fld.saddr = DN_FIB_RES_PREFSRC(res);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001167
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 if (dev_out)
1169 dev_put(dev_out);
1170 dev_out = DN_FIB_RES_DEV(res);
1171 dev_hold(dev_out);
David S. Millerbef55ae2011-03-12 17:17:10 -05001172 fld.flowidn_oif = dev_out->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 gateway = DN_FIB_RES_GW(res);
1174
1175make_route:
1176 if (dev_out->flags & IFF_LOOPBACK)
1177 flags |= RTCF_LOCAL;
1178
David S. Millerf5b0a872012-07-19 12:31:33 -07001179 rt = dst_alloc(&dn_dst_ops, dev_out, 1, DST_OBSOLETE_NONE, DST_HOST);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 if (rt == NULL)
1181 goto e_nobufs;
1182
David S. Millercf911662011-04-28 14:31:47 -07001183 memset(&rt->fld, 0, sizeof(rt->fld));
David S. Millerbef55ae2011-03-12 17:17:10 -05001184 rt->fld.saddr = oldflp->saddr;
1185 rt->fld.daddr = oldflp->daddr;
1186 rt->fld.flowidn_oif = oldflp->flowidn_oif;
1187 rt->fld.flowidn_iif = 0;
1188 rt->fld.flowidn_mark = oldflp->flowidn_mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
David S. Millerbef55ae2011-03-12 17:17:10 -05001190 rt->rt_saddr = fld.saddr;
1191 rt->rt_daddr = fld.daddr;
1192 rt->rt_gateway = gateway ? gateway : fld.daddr;
1193 rt->rt_local_src = fld.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
David S. Millerbef55ae2011-03-12 17:17:10 -05001195 rt->rt_dst_map = fld.daddr;
1196 rt->rt_src_map = fld.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
David S. Millerfccd7d52012-07-02 22:22:18 -07001198 rt->n = neigh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 neigh = NULL;
1200
Changli Gaod8d1f302010-06-10 23:31:35 -07001201 rt->dst.lastuse = jiffies;
1202 rt->dst.output = dn_output;
1203 rt->dst.input = dn_rt_bug;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 rt->rt_flags = flags;
1205 if (flags & RTCF_LOCAL)
Changli Gaod8d1f302010-06-10 23:31:35 -07001206 rt->dst.input = dn_nsp_rx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
1208 err = dn_rt_set_next_hop(rt, &res);
1209 if (err)
1210 goto e_neighbour;
1211
David S. Millerbef55ae2011-03-12 17:17:10 -05001212 hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 dn_insert_route(rt, hash, (struct dn_route **)pprt);
1214
1215done:
1216 if (neigh)
1217 neigh_release(neigh);
1218 if (free_res)
1219 dn_fib_res_put(&res);
1220 if (dev_out)
1221 dev_put(dev_out);
1222out:
1223 return err;
1224
1225e_addr:
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001226 err = -EADDRNOTAVAIL;
1227 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228e_inval:
1229 err = -EINVAL;
1230 goto done;
1231e_nobufs:
1232 err = -ENOBUFS;
1233 goto done;
1234e_neighbour:
Changli Gaod8d1f302010-06-10 23:31:35 -07001235 dst_free(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 goto e_nobufs;
1237}
1238
1239
1240/*
1241 * N.B. The flags may be moved into the flowi at some future stage.
1242 */
David S. Millerbef55ae2011-03-12 17:17:10 -05001243static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244{
Eric Dumazet95c96172012-04-15 05:58:06 +00001245 unsigned int hash = dn_hash(flp->saddr, flp->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 struct dn_route *rt = NULL;
1247
1248 if (!(flags & MSG_TRYHARD)) {
1249 rcu_read_lock_bh();
Paul E. McKenneya898def2010-02-22 17:04:49 -08001250 for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt;
Changli Gaod8d1f302010-06-10 23:31:35 -07001251 rt = rcu_dereference_bh(rt->dst.dn_next)) {
David S. Millerbef55ae2011-03-12 17:17:10 -05001252 if ((flp->daddr == rt->fld.daddr) &&
1253 (flp->saddr == rt->fld.saddr) &&
1254 (flp->flowidn_mark == rt->fld.flowidn_mark) &&
David S. Millerc7537962010-11-11 17:07:48 -08001255 dn_is_output_route(rt) &&
David S. Millerbef55ae2011-03-12 17:17:10 -05001256 (rt->fld.flowidn_oif == flp->flowidn_oif)) {
Changli Gaod8d1f302010-06-10 23:31:35 -07001257 dst_use(&rt->dst, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 rcu_read_unlock_bh();
Changli Gaod8d1f302010-06-10 23:31:35 -07001259 *pprt = &rt->dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 return 0;
1261 }
1262 }
1263 rcu_read_unlock_bh();
1264 }
1265
1266 return dn_route_output_slow(pprt, flp, flags);
1267}
1268
David S. Millerbef55ae2011-03-12 17:17:10 -05001269static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270{
1271 int err;
1272
1273 err = __dn_route_output_key(pprt, flp, flags);
David S. Millerbef55ae2011-03-12 17:17:10 -05001274 if (err == 0 && flp->flowidn_proto) {
1275 *pprt = xfrm_lookup(&init_net, *pprt,
1276 flowidn_to_flowi(flp), NULL, 0);
David S. Miller452edd52011-03-02 13:27:41 -08001277 if (IS_ERR(*pprt)) {
1278 err = PTR_ERR(*pprt);
1279 *pprt = NULL;
1280 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 }
1282 return err;
1283}
1284
Cong Wangcec771d2013-01-22 21:09:50 +00001285int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *fl, struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286{
1287 int err;
1288
1289 err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
David S. Millerbef55ae2011-03-12 17:17:10 -05001290 if (err == 0 && fl->flowidn_proto) {
David S. Miller80c0bc92011-03-01 14:36:37 -08001291 if (!(flags & MSG_DONTWAIT))
David S. Millerbef55ae2011-03-12 17:17:10 -05001292 fl->flowidn_flags |= FLOWI_FLAG_CAN_SLEEP;
1293 *pprt = xfrm_lookup(&init_net, *pprt,
1294 flowidn_to_flowi(fl), sk, 0);
David S. Miller452edd52011-03-02 13:27:41 -08001295 if (IS_ERR(*pprt)) {
1296 err = PTR_ERR(*pprt);
1297 *pprt = NULL;
1298 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 }
1300 return err;
1301}
1302
1303static int dn_route_input_slow(struct sk_buff *skb)
1304{
1305 struct dn_route *rt = NULL;
1306 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1307 struct net_device *in_dev = skb->dev;
1308 struct net_device *out_dev = NULL;
1309 struct dn_dev *dn_db;
1310 struct neighbour *neigh = NULL;
Eric Dumazet95c96172012-04-15 05:58:06 +00001311 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 int flags = 0;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -08001313 __le16 gateway = 0;
1314 __le16 local_src = 0;
David S. Millerbef55ae2011-03-12 17:17:10 -05001315 struct flowidn fld = {
1316 .daddr = cb->dst,
1317 .saddr = cb->src,
1318 .flowidn_scope = RT_SCOPE_UNIVERSE,
1319 .flowidn_mark = skb->mark,
1320 .flowidn_iif = skb->dev->ifindex,
David S. Miller1d28f422011-03-12 00:29:39 -05001321 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1323 int err = -EINVAL;
1324 int free_res = 0;
1325
1326 dev_hold(in_dev);
1327
Eric Dumazetfc766e4c2010-10-29 03:09:24 +00001328 if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 goto out;
1330
1331 /* Zero source addresses are not allowed */
David S. Millerbef55ae2011-03-12 17:17:10 -05001332 if (fld.saddr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 goto out;
1334
1335 /*
1336 * In this case we've just received a packet from a source
1337 * outside ourselves pretending to come from us. We don't
1338 * allow it any further to prevent routing loops, spoofing and
1339 * other nasties. Loopback packets already have the dst attached
1340 * so this only affects packets which have originated elsewhere.
1341 */
1342 err = -ENOTUNIQ;
1343 if (dn_dev_islocal(in_dev, cb->src))
1344 goto out;
1345
David S. Millerbef55ae2011-03-12 17:17:10 -05001346 err = dn_fib_lookup(&fld, &res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 if (err) {
1348 if (err != -ESRCH)
1349 goto out;
1350 /*
1351 * Is the destination us ?
1352 */
1353 if (!dn_dev_islocal(in_dev, cb->dst))
1354 goto e_inval;
1355
1356 res.type = RTN_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 } else {
David S. Millerbef55ae2011-03-12 17:17:10 -05001358 __le16 src_map = fld.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 free_res = 1;
1360
1361 out_dev = DN_FIB_RES_DEV(res);
1362 if (out_dev == NULL) {
Joe Perchese87cc472012-05-13 21:56:26 +00001363 net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 goto e_inval;
1365 }
1366 dev_hold(out_dev);
1367
1368 if (res.r)
David S. Millerbef55ae2011-03-12 17:17:10 -05001369 src_map = fld.saddr; /* no NAT support for now */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
1371 gateway = DN_FIB_RES_GW(res);
1372 if (res.type == RTN_NAT) {
David S. Millerbef55ae2011-03-12 17:17:10 -05001373 fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 dn_fib_res_put(&res);
1375 free_res = 0;
David S. Millerbef55ae2011-03-12 17:17:10 -05001376 if (dn_fib_lookup(&fld, &res))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 goto e_inval;
1378 free_res = 1;
1379 if (res.type != RTN_UNICAST)
1380 goto e_inval;
1381 flags |= RTCF_DNAT;
David S. Millerbef55ae2011-03-12 17:17:10 -05001382 gateway = fld.daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 }
David S. Millerbef55ae2011-03-12 17:17:10 -05001384 fld.saddr = src_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 }
1386
1387 switch(res.type) {
1388 case RTN_UNICAST:
1389 /*
1390 * Forwarding check here, we only check for forwarding
1391 * being turned off, if you want to only forward intra
1392 * area, its up to you to set the routing tables up
1393 * correctly.
1394 */
1395 if (dn_db->parms.forwarding == 0)
1396 goto e_inval;
1397
David S. Millerbef55ae2011-03-12 17:17:10 -05001398 if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
1399 dn_fib_select_multipath(&fld, &res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001401 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1403 * flag as a hint to set the intra-ethernet bit when
1404 * forwarding. If we've got NAT in operation, we don't do
1405 * this optimisation.
1406 */
1407 if (out_dev == in_dev && !(flags & RTCF_NAT))
1408 flags |= RTCF_DOREDIRECT;
1409
1410 local_src = DN_FIB_RES_PREFSRC(res);
1411
1412 case RTN_BLACKHOLE:
1413 case RTN_UNREACHABLE:
1414 break;
1415 case RTN_LOCAL:
1416 flags |= RTCF_LOCAL;
David S. Millerbef55ae2011-03-12 17:17:10 -05001417 fld.saddr = cb->dst;
1418 fld.daddr = cb->src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
1420 /* Routing tables gave us a gateway */
1421 if (gateway)
1422 goto make_route;
1423
1424 /* Packet was intra-ethernet, so we know its on-link */
Steven Whitehouse3a31b9d2006-10-18 20:45:22 -07001425 if (cb->rt_flags & DN_RT_F_IE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 gateway = cb->src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 goto make_route;
1428 }
1429
1430 /* Use the default router if there is one */
1431 neigh = neigh_clone(dn_db->router);
1432 if (neigh) {
1433 gateway = ((struct dn_neigh *)neigh)->addr;
1434 goto make_route;
1435 }
1436
1437 /* Close eyes and pray */
1438 gateway = cb->src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 goto make_route;
1440 default:
1441 goto e_inval;
1442 }
1443
1444make_route:
David S. Millerf5b0a872012-07-19 12:31:33 -07001445 rt = dst_alloc(&dn_dst_ops, out_dev, 0, DST_OBSOLETE_NONE, DST_HOST);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 if (rt == NULL)
1447 goto e_nobufs;
1448
David S. Millercf911662011-04-28 14:31:47 -07001449 memset(&rt->fld, 0, sizeof(rt->fld));
David S. Millerbef55ae2011-03-12 17:17:10 -05001450 rt->rt_saddr = fld.saddr;
1451 rt->rt_daddr = fld.daddr;
1452 rt->rt_gateway = fld.daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 if (gateway)
1454 rt->rt_gateway = gateway;
1455 rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
1456
David S. Millerbef55ae2011-03-12 17:17:10 -05001457 rt->rt_dst_map = fld.daddr;
1458 rt->rt_src_map = fld.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
David S. Millerbef55ae2011-03-12 17:17:10 -05001460 rt->fld.saddr = cb->src;
1461 rt->fld.daddr = cb->dst;
1462 rt->fld.flowidn_oif = 0;
1463 rt->fld.flowidn_iif = in_dev->ifindex;
1464 rt->fld.flowidn_mark = fld.flowidn_mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465
David S. Millerfccd7d52012-07-02 22:22:18 -07001466 rt->n = neigh;
Changli Gaod8d1f302010-06-10 23:31:35 -07001467 rt->dst.lastuse = jiffies;
1468 rt->dst.output = dn_rt_bug;
Joe Perches06f8fe12011-07-01 09:43:03 +00001469 switch (res.type) {
1470 case RTN_UNICAST:
1471 rt->dst.input = dn_forward;
1472 break;
1473 case RTN_LOCAL:
1474 rt->dst.output = dn_output;
1475 rt->dst.input = dn_nsp_rx;
1476 rt->dst.dev = in_dev;
1477 flags |= RTCF_LOCAL;
1478 break;
1479 default:
1480 case RTN_UNREACHABLE:
1481 case RTN_BLACKHOLE:
1482 rt->dst.input = dst_discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 }
1484 rt->rt_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
1486 err = dn_rt_set_next_hop(rt, &res);
1487 if (err)
1488 goto e_neighbour;
1489
David S. Millerbef55ae2011-03-12 17:17:10 -05001490 hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
Eric Dumazetadf30902009-06-02 05:19:30 +00001491 dn_insert_route(rt, hash, &rt);
Changli Gaod8d1f302010-06-10 23:31:35 -07001492 skb_dst_set(skb, &rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
1494done:
1495 if (neigh)
1496 neigh_release(neigh);
1497 if (free_res)
1498 dn_fib_res_put(&res);
1499 dev_put(in_dev);
1500 if (out_dev)
1501 dev_put(out_dev);
1502out:
1503 return err;
1504
1505e_inval:
1506 err = -EINVAL;
1507 goto done;
1508
1509e_nobufs:
1510 err = -ENOBUFS;
1511 goto done;
1512
1513e_neighbour:
Changli Gaod8d1f302010-06-10 23:31:35 -07001514 dst_free(&rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 goto done;
1516}
1517
Roel Kluin5eaa65b2008-12-10 15:18:31 -08001518static int dn_route_input(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519{
1520 struct dn_route *rt;
1521 struct dn_skb_cb *cb = DN_SKB_CB(skb);
Eric Dumazet95c96172012-04-15 05:58:06 +00001522 unsigned int hash = dn_hash(cb->src, cb->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523
Eric Dumazetadf30902009-06-02 05:19:30 +00001524 if (skb_dst(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 return 0;
1526
1527 rcu_read_lock();
1528 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
Changli Gaod8d1f302010-06-10 23:31:35 -07001529 rt = rcu_dereference(rt->dst.dn_next)) {
David S. Millerbef55ae2011-03-12 17:17:10 -05001530 if ((rt->fld.saddr == cb->src) &&
1531 (rt->fld.daddr == cb->dst) &&
1532 (rt->fld.flowidn_oif == 0) &&
1533 (rt->fld.flowidn_mark == skb->mark) &&
1534 (rt->fld.flowidn_iif == cb->iif)) {
Changli Gaod8d1f302010-06-10 23:31:35 -07001535 dst_use(&rt->dst, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 rcu_read_unlock();
Eric Dumazetadf30902009-06-02 05:19:30 +00001537 skb_dst_set(skb, (struct dst_entry *)rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 return 0;
1539 }
1540 }
1541 rcu_read_unlock();
1542
1543 return dn_route_input_slow(skb);
1544}
1545
Eric W. Biederman15e47302012-09-07 20:12:54 +00001546static int dn_rt_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07001547 int event, int nowait, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548{
Eric Dumazetadf30902009-06-02 05:19:30 +00001549 struct dn_route *rt = (struct dn_route *)skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 struct rtmsg *r;
1551 struct nlmsghdr *nlh;
Thomas Grafe3703b32006-11-27 09:27:07 -08001552 long expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Eric W. Biederman15e47302012-09-07 20:12:54 +00001554 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags);
David S. Miller737100e2012-06-26 21:46:19 -07001555 if (!nlh)
Thomas Graf6b609782012-06-26 23:36:15 +00001556 return -EMSGSIZE;
1557
David S. Miller737100e2012-06-26 21:46:19 -07001558 r = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559 r->rtm_family = AF_DECnet;
1560 r->rtm_dst_len = 16;
1561 r->rtm_src_len = 0;
1562 r->rtm_tos = 0;
1563 r->rtm_table = RT_TABLE_MAIN;
1564 r->rtm_type = rt->rt_type;
1565 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1566 r->rtm_scope = RT_SCOPE_UNIVERSE;
1567 r->rtm_protocol = RTPROT_UNSPEC;
Thomas Graf6b609782012-06-26 23:36:15 +00001568
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 if (rt->rt_flags & RTCF_NOTIFY)
1570 r->rtm_flags |= RTM_F_NOTIFY;
Thomas Graf6b609782012-06-26 23:36:15 +00001571
1572 if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 ||
1573 nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0)
1574 goto errout;
1575
David S. Millerbef55ae2011-03-12 17:17:10 -05001576 if (rt->fld.saddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 r->rtm_src_len = 16;
Thomas Graf6b609782012-06-26 23:36:15 +00001578 if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0)
1579 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 }
Thomas Graf6b609782012-06-26 23:36:15 +00001581 if (rt->dst.dev &&
1582 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0)
1583 goto errout;
1584
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 /*
1586 * Note to self - change this if input routes reverse direction when
1587 * they deal only with inputs and not with replies like they do
1588 * currently.
1589 */
Thomas Graf6b609782012-06-26 23:36:15 +00001590 if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0)
1591 goto errout;
1592
1593 if (rt->rt_daddr != rt->rt_gateway &&
1594 nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0)
1595 goto errout;
1596
David S. Millerdefb3512010-12-08 21:16:57 -08001597 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
Thomas Graf6b609782012-06-26 23:36:15 +00001598 goto errout;
1599
Changli Gaod8d1f302010-06-10 23:31:35 -07001600 expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
David S. Miller87a50692012-07-10 05:06:14 -07001601 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires,
Changli Gaod8d1f302010-06-10 23:31:35 -07001602 rt->dst.error) < 0)
Thomas Graf6b609782012-06-26 23:36:15 +00001603 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604
Thomas Graf6b609782012-06-26 23:36:15 +00001605 if (dn_is_input_route(rt) &&
1606 nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0)
1607 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608
Thomas Graf6b609782012-06-26 23:36:15 +00001609 return nlmsg_end(skb, nlh);
1610
1611errout:
1612 nlmsg_cancel(skb, nlh);
1613 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614}
1615
Thomas Graf2fa70df2013-03-22 16:50:29 +00001616const 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 },
1628};
1629
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630/*
1631 * This is called by both endnodes and routers now.
1632 */
Thomas Graf661d2962013-03-21 07:45:29 +00001633static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001635 struct net *net = sock_net(in_skb->sk);
David S. Miller737100e2012-06-26 21:46:19 -07001636 struct rtmsg *rtm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 struct dn_route *rt = NULL;
1638 struct dn_skb_cb *cb;
1639 int err;
1640 struct sk_buff *skb;
David S. Millerbef55ae2011-03-12 17:17:10 -05001641 struct flowidn fld;
Thomas Graf58d7d8f2013-03-21 07:45:28 +00001642 struct nlattr *tb[RTA_MAX+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08001644 if (!net_eq(net, &init_net))
Denis V. Lunevb8542722007-12-01 00:21:31 +11001645 return -EINVAL;
1646
Thomas Graf58d7d8f2013-03-21 07:45:28 +00001647 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_dn_policy);
1648 if (err < 0)
1649 return err;
1650
David S. Millerbef55ae2011-03-12 17:17:10 -05001651 memset(&fld, 0, sizeof(fld));
1652 fld.flowidn_proto = DNPROTO_NSP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
Thomas Graf6b609782012-06-26 23:36:15 +00001654 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 if (skb == NULL)
1656 return -ENOBUFS;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001657 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 cb = DN_SKB_CB(skb);
1659
Thomas Graf58d7d8f2013-03-21 07:45:28 +00001660 if (tb[RTA_SRC])
1661 fld.saddr = nla_get_le16(tb[RTA_SRC]);
1662
1663 if (tb[RTA_DST])
1664 fld.daddr = nla_get_le16(tb[RTA_DST]);
1665
1666 if (tb[RTA_IIF])
1667 fld.flowidn_iif = nla_get_u32(tb[RTA_IIF]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668
David S. Millerbef55ae2011-03-12 17:17:10 -05001669 if (fld.flowidn_iif) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 struct net_device *dev;
David S. Millerbef55ae2011-03-12 17:17:10 -05001671 if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 kfree_skb(skb);
1673 return -ENODEV;
1674 }
1675 if (!dev->dn_ptr) {
1676 dev_put(dev);
1677 kfree_skb(skb);
1678 return -ENODEV;
1679 }
YOSHIFUJI Hideakib98999d2007-12-12 03:51:49 +09001680 skb->protocol = htons(ETH_P_DNA_RT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 skb->dev = dev;
David S. Millerbef55ae2011-03-12 17:17:10 -05001682 cb->src = fld.saddr;
1683 cb->dst = fld.daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 local_bh_disable();
1685 err = dn_route_input(skb);
1686 local_bh_enable();
1687 memset(cb, 0, sizeof(struct dn_skb_cb));
Eric Dumazetadf30902009-06-02 05:19:30 +00001688 rt = (struct dn_route *)skb_dst(skb);
Changli Gaod8d1f302010-06-10 23:31:35 -07001689 if (!err && -rt->dst.error)
1690 err = rt->dst.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 } else {
Thomas Graf58d7d8f2013-03-21 07:45:28 +00001692 if (tb[RTA_OIF])
1693 fld.flowidn_oif = nla_get_u32(tb[RTA_OIF]);
1694
David S. Millerbef55ae2011-03-12 17:17:10 -05001695 err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 }
1697
1698 if (skb->dev)
1699 dev_put(skb->dev);
1700 skb->dev = NULL;
1701 if (err)
1702 goto out_free;
Changli Gaod8d1f302010-06-10 23:31:35 -07001703 skb_dst_set(skb, &rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 if (rtm->rtm_flags & RTM_F_NOTIFY)
1705 rt->rt_flags |= RTCF_NOTIFY;
1706
Eric W. Biederman15e47302012-09-07 20:12:54 +00001707 err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708
1709 if (err == 0)
1710 goto out_free;
1711 if (err < 0) {
1712 err = -EMSGSIZE;
1713 goto out_free;
1714 }
1715
Eric W. Biederman15e47302012-09-07 20:12:54 +00001716 return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).portid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717
1718out_free:
1719 kfree_skb(skb);
1720 return err;
1721}
1722
1723/*
1724 * For routers, this is called from dn_fib_dump, but for endnodes its
1725 * called directly from the rtnetlink dispatch table.
1726 */
1727int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1728{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001729 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 struct dn_route *rt;
1731 int h, s_h;
1732 int idx, s_idx;
Thomas Graf6b609782012-06-26 23:36:15 +00001733 struct rtmsg *rtm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08001735 if (!net_eq(net, &init_net))
Denis V. Lunevb8542722007-12-01 00:21:31 +11001736 return 0;
1737
Thomas Graf6b609782012-06-26 23:36:15 +00001738 if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 return -EINVAL;
Thomas Graf6b609782012-06-26 23:36:15 +00001740
1741 rtm = nlmsg_data(cb->nlh);
1742 if (!(rtm->rtm_flags & RTM_F_CLONED))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 return 0;
1744
1745 s_h = cb->args[0];
1746 s_idx = idx = cb->args[1];
1747 for(h = 0; h <= dn_rt_hash_mask; h++) {
1748 if (h < s_h)
1749 continue;
1750 if (h > s_h)
1751 s_idx = 0;
1752 rcu_read_lock_bh();
Paul E. McKenneya898def2010-02-22 17:04:49 -08001753 for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 rt;
Changli Gaod8d1f302010-06-10 23:31:35 -07001755 rt = rcu_dereference_bh(rt->dst.dn_next), idx++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 if (idx < s_idx)
1757 continue;
Changli Gaod8d1f302010-06-10 23:31:35 -07001758 skb_dst_set(skb, dst_clone(&rt->dst));
Eric W. Biederman15e47302012-09-07 20:12:54 +00001759 if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).portid,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001760 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07001761 1, NLM_F_MULTI) <= 0) {
Eric Dumazetadf30902009-06-02 05:19:30 +00001762 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 rcu_read_unlock_bh();
1764 goto done;
1765 }
Eric Dumazetadf30902009-06-02 05:19:30 +00001766 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767 }
1768 rcu_read_unlock_bh();
1769 }
1770
1771done:
1772 cb->args[0] = h;
1773 cb->args[1] = idx;
1774 return skb->len;
1775}
1776
1777#ifdef CONFIG_PROC_FS
1778struct dn_rt_cache_iter_state {
1779 int bucket;
1780};
1781
1782static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1783{
1784 struct dn_route *rt = NULL;
1785 struct dn_rt_cache_iter_state *s = seq->private;
1786
1787 for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1788 rcu_read_lock_bh();
Paul E. McKenneya898def2010-02-22 17:04:49 -08001789 rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 if (rt)
1791 break;
1792 rcu_read_unlock_bh();
1793 }
Paul E. McKenneya898def2010-02-22 17:04:49 -08001794 return rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795}
1796
1797static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1798{
Eric Dumazet0d89d792008-01-10 22:35:21 -08001799 struct dn_rt_cache_iter_state *s = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800
Eric Dumazetfc766e4c2010-10-29 03:09:24 +00001801 rt = rcu_dereference_bh(rt->dst.dn_next);
1802 while (!rt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 rcu_read_unlock_bh();
1804 if (--s->bucket < 0)
1805 break;
1806 rcu_read_lock_bh();
Eric Dumazetfc766e4c2010-10-29 03:09:24 +00001807 rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 }
Eric Dumazetfc766e4c2010-10-29 03:09:24 +00001809 return rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810}
1811
1812static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1813{
1814 struct dn_route *rt = dn_rt_cache_get_first(seq);
1815
1816 if (rt) {
1817 while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1818 --*pos;
1819 }
1820 return *pos ? NULL : rt;
1821}
1822
1823static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1824{
1825 struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1826 ++*pos;
1827 return rt;
1828}
1829
1830static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1831{
1832 if (v)
1833 rcu_read_unlock_bh();
1834}
1835
1836static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1837{
1838 struct dn_route *rt = v;
1839 char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1840
1841 seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
David S. Miller794785b2012-07-10 00:52:56 -07001842 rt->dst.dev ? rt->dst.dev->name : "*",
1843 dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1),
1844 dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2),
1845 atomic_read(&rt->dst.__refcnt),
1846 rt->dst.__use, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 return 0;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001848}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849
Philippe De Muyter56b3d972007-07-10 23:07:31 -07001850static const struct seq_operations dn_rt_cache_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 .start = dn_rt_cache_seq_start,
1852 .next = dn_rt_cache_seq_next,
1853 .stop = dn_rt_cache_seq_stop,
1854 .show = dn_rt_cache_seq_show,
1855};
1856
1857static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
1858{
Pavel Emelyanov31164082007-10-10 02:30:23 -07001859 return seq_open_private(file, &dn_rt_cache_seq_ops,
1860 sizeof(struct dn_rt_cache_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861}
1862
Arjan van de Ven9a321442007-02-12 00:55:35 -08001863static const struct file_operations dn_rt_cache_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 .owner = THIS_MODULE,
1865 .open = dn_rt_cache_seq_open,
1866 .read = seq_read,
1867 .llseek = seq_lseek,
1868 .release = seq_release_private,
1869};
1870
1871#endif /* CONFIG_PROC_FS */
1872
1873void __init dn_route_init(void)
1874{
1875 int i, goal, order;
1876
Alexey Dobriyane5d679f332006-08-26 19:25:52 -07001877 dn_dst_ops.kmem_cachep =
1878 kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +09001879 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
Eric Dumazetfc66f952010-10-08 06:37:34 +00001880 dst_entries_init(&dn_dst_ops);
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -08001881 setup_timer(&dn_route_timer, dn_dst_check_expire, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1883 add_timer(&dn_route_timer);
1884
Jan Beulich44813742009-09-21 17:03:05 -07001885 goal = totalram_pages >> (26 - PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886
1887 for(order = 0; (1UL << order) < goal; order++)
1888 /* NOTHING */;
1889
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001890 /*
1891 * Only want 1024 entries max, since the table is very, very unlikely
1892 * to be larger than that.
1893 */
1894 while(order && ((((1UL << order) * PAGE_SIZE) /
1895 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1896 order--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001898 do {
1899 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1900 sizeof(struct dn_rt_hash_bucket);
1901 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1902 dn_rt_hash_mask--;
1903 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1904 __get_free_pages(GFP_ATOMIC, order);
1905 } while (dn_rt_hash_table == NULL && --order > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906
1907 if (!dn_rt_hash_table)
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001908 panic("Failed to allocate DECnet route cache hash table\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001910 printk(KERN_INFO
1911 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1912 dn_rt_hash_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1914
1915 dn_rt_hash_mask--;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001916 for(i = 0; i <= dn_rt_hash_mask; i++) {
1917 spin_lock_init(&dn_rt_hash_table[i].lock);
1918 dn_rt_hash_table[i].chain = NULL;
1919 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001921 dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922
Gao fengd4beaa62013-02-18 01:34:54 +00001923 proc_create("decnet_cache", S_IRUGO, init_net.proc_net,
1924 &dn_rt_cache_seq_fops);
Thomas Graffa34ddd2007-03-22 11:57:46 -07001925
1926#ifdef CONFIG_DECNET_ROUTER
Greg Rosec7ac8672011-06-10 01:27:09 +00001927 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
1928 dn_fib_dump, NULL);
Thomas Graffa34ddd2007-03-22 11:57:46 -07001929#else
1930 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
Greg Rosec7ac8672011-06-10 01:27:09 +00001931 dn_cache_dump, NULL);
Thomas Graffa34ddd2007-03-22 11:57:46 -07001932#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933}
1934
1935void __exit dn_route_cleanup(void)
1936{
1937 del_timer(&dn_route_timer);
1938 dn_run_flush(0);
1939
Gao fengece31ff2013-02-18 01:34:56 +00001940 remove_proc_entry("decnet_cache", init_net.proc_net);
Eric Dumazetfc66f952010-10-08 06:37:34 +00001941 dst_entries_destroy(&dn_dst_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942}
1943