blob: f968c1b58f47d1892ee392eea366d67f4c687397 [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 Forwarding Information Base (Routing Tables)
7 *
8 * Author: Steve Whitehouse <SteveW@ACM.org>
9 * Mostly copied from the IPv4 routing code
10 *
11 *
12 * Changes:
13 *
14 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/string.h>
16#include <linux/net.h>
17#include <linux/socket.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/sockios.h>
20#include <linux/init.h>
21#include <linux/skbuff.h>
22#include <linux/netlink.h>
23#include <linux/rtnetlink.h>
24#include <linux/proc_fs.h>
25#include <linux/netdevice.h>
26#include <linux/timer.h>
27#include <linux/spinlock.h>
Arun Sharma600634972011-07-26 16:09:06 -070028#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/uaccess.h>
30#include <linux/route.h> /* RTF_xxx */
31#include <net/neighbour.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070032#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <net/dst.h>
34#include <net/flow.h>
Steven Whitehousea8731cb2006-08-09 15:56:46 -070035#include <net/fib_rules.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <net/dn.h>
37#include <net/dn_route.h>
38#include <net/dn_fib.h>
39#include <net/dn_neigh.h>
40#include <net/dn_dev.h>
41
42struct dn_zone
43{
44 struct dn_zone *dz_next;
45 struct dn_fib_node **dz_hash;
46 int dz_nent;
47 int dz_divisor;
48 u32 dz_hashmask;
49#define DZ_HASHMASK(dz) ((dz)->dz_hashmask)
50 int dz_order;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -080051 __le16 dz_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#define DZ_MASK(dz) ((dz)->dz_mask)
53};
54
55struct dn_hash
56{
57 struct dn_zone *dh_zones[17];
58 struct dn_zone *dh_zone_list;
59};
60
61#define dz_key_0(key) ((key).datum = 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +090064 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66#define endfor_nexthops(fi) }
67
68#define DN_MAX_DIVISOR 1024
69#define DN_S_ZOMBIE 1
70#define DN_S_ACCESSED 2
71
72#define DN_FIB_SCAN(f, fp) \
73for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
74
75#define DN_FIB_SCAN_KEY(f, fp, key) \
76for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
77
78#define RT_TABLE_MIN 1
Patrick McHardyabcab262006-08-10 23:11:47 -070079#define DN_FIB_TABLE_HASHSZ 256
80static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ];
Linus Torvalds1da177e2005-04-16 15:20:36 -070081static DEFINE_RWLOCK(dn_fib_tables_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Christoph Lametere18b8902006-12-06 20:33:20 -080083static struct kmem_cache *dn_hash_kmem __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084static int dn_fib_hash_zombies;
85
86static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
87{
Harvey Harrisonc4106aa2008-11-27 00:12:47 -080088 u16 h = le16_to_cpu(key.datum)>>(16 - dz->dz_order);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 h ^= (h >> 10);
90 h ^= (h >> 6);
91 h &= DZ_HASHMASK(dz);
92 return *(dn_fib_idx_t *)&h;
93}
94
Steven Whitehousec4ea94a2006-03-20 22:42:39 -080095static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
97 dn_fib_key_t k;
98 k.datum = dst & DZ_MASK(dz);
99 return k;
100}
101
102static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz)
103{
104 return &dz->dz_hash[dn_hash(key, dz).datum];
105}
106
107static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz)
108{
109 return dz->dz_hash[dn_hash(key, dz).datum];
110}
111
112static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b)
113{
114 return a.datum == b.datum;
115}
116
117static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b)
118{
119 return a.datum <= b.datum;
120}
121
122static inline void dn_rebuild_zone(struct dn_zone *dz,
123 struct dn_fib_node **old_ht,
124 int old_divisor)
125{
David S. Millera01c1332011-04-17 20:47:07 -0700126 struct dn_fib_node *f, **fp, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 for(i = 0; i < old_divisor; i++) {
David S. Millera01c1332011-04-17 20:47:07 -0700130 for(f = old_ht[i]; f; f = next) {
131 next = f->fn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 for(fp = dn_chain_p(f->fn_key, dz);
133 *fp && dn_key_leq((*fp)->fn_key, f->fn_key);
134 fp = &(*fp)->fn_next)
135 /* NOTHING */;
136 f->fn_next = *fp;
137 *fp = f;
138 }
139 }
140}
141
142static void dn_rehash_zone(struct dn_zone *dz)
143{
144 struct dn_fib_node **ht, **old_ht;
145 int old_divisor, new_divisor;
146 u32 new_hashmask;
147
148 old_divisor = dz->dz_divisor;
149
Joe Perches06f8fe12011-07-01 09:43:03 +0000150 switch (old_divisor) {
151 case 16:
152 new_divisor = 256;
153 new_hashmask = 0xFF;
154 break;
155 default:
156 printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n",
157 old_divisor);
158 case 256:
159 new_divisor = 1024;
160 new_hashmask = 0x3FF;
161 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
163
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700164 ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (ht == NULL)
166 return;
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 write_lock_bh(&dn_fib_tables_lock);
169 old_ht = dz->dz_hash;
170 dz->dz_hash = ht;
171 dz->dz_hashmask = new_hashmask;
172 dz->dz_divisor = new_divisor;
173 dn_rebuild_zone(dz, old_ht, old_divisor);
174 write_unlock_bh(&dn_fib_tables_lock);
175 kfree(old_ht);
176}
177
178static void dn_free_node(struct dn_fib_node *f)
179{
180 dn_fib_release_info(DN_FIB_INFO(f));
181 kmem_cache_free(dn_hash_kmem, f);
182}
183
184
185static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
186{
187 int i;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700188 struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 if (!dz)
190 return NULL;
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (z) {
193 dz->dz_divisor = 16;
194 dz->dz_hashmask = 0x0F;
195 } else {
196 dz->dz_divisor = 1;
197 dz->dz_hashmask = 0;
198 }
199
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700200 dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 if (!dz->dz_hash) {
202 kfree(dz);
203 return NULL;
204 }
205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 dz->dz_order = z;
207 dz->dz_mask = dnet_make_mask(z);
208
209 for(i = z + 1; i <= 16; i++)
210 if (table->dh_zones[i])
211 break;
212
213 write_lock_bh(&dn_fib_tables_lock);
214 if (i>16) {
215 dz->dz_next = table->dh_zone_list;
216 table->dh_zone_list = dz;
217 } else {
218 dz->dz_next = table->dh_zones[i]->dz_next;
219 table->dh_zones[i]->dz_next = dz;
220 }
221 table->dh_zones[z] = dz;
222 write_unlock_bh(&dn_fib_tables_lock);
223 return dz;
224}
225
226
227static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
228{
229 struct rtnexthop *nhp;
230 int nhlen;
231
232 if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
233 return 1;
234
235 if (rta->rta_oif || rta->rta_gw) {
236 if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
237 (!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
238 return 0;
239 return 1;
240 }
241
242 if (rta->rta_mp == NULL)
243 return 0;
244
245 nhp = RTA_DATA(rta->rta_mp);
246 nhlen = RTA_PAYLOAD(rta->rta_mp);
247
248 for_nexthops(fi) {
249 int attrlen = nhlen - sizeof(struct rtnexthop);
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800250 __le16 gw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
253 return -EINVAL;
254 if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
255 return 1;
256 if (attrlen) {
257 gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
258
259 if (gw && gw != nh->nh_gw)
260 return 1;
261 }
262 nhp = RTNH_NEXT(nhp);
263 } endfor_nexthops(fi);
264
265 return 0;
266}
267
Thomas Graf339bf982006-11-10 14:10:15 -0800268static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi)
269{
David S. Miller75356f22006-11-12 23:02:01 -0800270 size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg))
Thomas Graf339bf982006-11-10 14:10:15 -0800271 + nla_total_size(4) /* RTA_TABLE */
272 + nla_total_size(2) /* RTA_DST */
273 + nla_total_size(4); /* RTA_PRIORITY */
274
275 /* space for nested metrics */
276 payload += nla_total_size((RTAX_MAX * nla_total_size(4)));
277
278 if (fi->fib_nhs) {
279 /* Also handles the special case fib_nhs == 1 */
280
281 /* each nexthop is packed in an attribute */
282 size_t nhsize = nla_total_size(sizeof(struct rtnexthop));
283
284 /* may contain a gateway attribute */
285 nhsize += nla_total_size(4);
286
287 /* all nexthops are packed in a nested attribute */
288 payload += nla_total_size(fi->fib_nhs * nhsize);
289 }
290
291 return payload;
292}
293
Eric W. Biederman15e47302012-09-07 20:12:54 +0000294static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900295 u32 tb_id, u8 type, u8 scope, void *dst, int dst_len,
296 struct dn_fib_info *fi, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900298 struct rtmsg *rtm;
299 struct nlmsghdr *nlh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Eric W. Biederman15e47302012-09-07 20:12:54 +0000301 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
David S. Miller3f7a3282012-06-26 21:47:21 -0700302 if (!nlh)
Thomas Graf6b609782012-06-26 23:36:15 +0000303 return -EMSGSIZE;
304
David S. Miller3f7a3282012-06-26 21:47:21 -0700305 rtm = nlmsg_data(nlh);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900306 rtm->rtm_family = AF_DECnet;
307 rtm->rtm_dst_len = dst_len;
308 rtm->rtm_src_len = 0;
309 rtm->rtm_tos = 0;
310 rtm->rtm_table = tb_id;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900311 rtm->rtm_flags = fi->fib_flags;
312 rtm->rtm_scope = scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 rtm->rtm_type = type;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900314 rtm->rtm_protocol = fi->fib_protocol;
Thomas Graf6b609782012-06-26 23:36:15 +0000315
316 if (nla_put_u32(skb, RTA_TABLE, tb_id) < 0)
317 goto errout;
318
319 if (rtm->rtm_dst_len &&
320 nla_put(skb, RTA_DST, 2, dst) < 0)
321 goto errout;
322
323 if (fi->fib_priority &&
324 nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority) < 0)
325 goto errout;
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
Thomas Graf6b609782012-06-26 23:36:15 +0000328 goto errout;
329
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900330 if (fi->fib_nhs == 1) {
Thomas Graf6b609782012-06-26 23:36:15 +0000331 if (fi->fib_nh->nh_gw &&
332 nla_put_le16(skb, RTA_GATEWAY, fi->fib_nh->nh_gw) < 0)
333 goto errout;
334
335 if (fi->fib_nh->nh_oif &&
336 nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif) < 0)
337 goto errout;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900338 }
Thomas Graf6b609782012-06-26 23:36:15 +0000339
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900340 if (fi->fib_nhs > 1) {
341 struct rtnexthop *nhp;
Thomas Graf6b609782012-06-26 23:36:15 +0000342 struct nlattr *mp_head;
343
344 if (!(mp_head = nla_nest_start(skb, RTA_MULTIPATH)))
345 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900347 for_nexthops(fi) {
Thomas Graf6b609782012-06-26 23:36:15 +0000348 if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp))))
349 goto errout;
350
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900351 nhp->rtnh_flags = nh->nh_flags & 0xFF;
352 nhp->rtnh_hops = nh->nh_weight - 1;
353 nhp->rtnh_ifindex = nh->nh_oif;
Thomas Graf6b609782012-06-26 23:36:15 +0000354
355 if (nh->nh_gw &&
356 nla_put_le16(skb, RTA_GATEWAY, nh->nh_gw) < 0)
357 goto errout;
358
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700359 nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900360 } endfor_nexthops(fi);
Thomas Graf6b609782012-06-26 23:36:15 +0000361
362 nla_nest_end(skb, mp_head);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900363 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Thomas Graf6b609782012-06-26 23:36:15 +0000365 return nlmsg_end(skb, nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Thomas Graf6b609782012-06-26 23:36:15 +0000367errout:
368 nlmsg_cancel(skb, nlh);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900369 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
372
Patrick McHardy2dfe55b2006-08-10 23:08:33 -0700373static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900374 struct nlmsghdr *nlh, struct netlink_skb_parms *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900376 struct sk_buff *skb;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000377 u32 portid = req ? req->portid : 0;
Thomas Grafdc738dd2006-08-15 00:33:35 -0700378 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900380 skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL);
381 if (skb == NULL)
Thomas Grafdc738dd2006-08-15 00:33:35 -0700382 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Eric W. Biederman15e47302012-09-07 20:12:54 +0000384 err = dn_fib_dump_info(skb, portid, nlh->nlmsg_seq, event, tb_id,
Thomas Grafdc738dd2006-08-15 00:33:35 -0700385 f->fn_type, f->fn_scope, &f->fn_key, z,
386 DN_FIB_INFO(f), 0);
Patrick McHardy26932562007-01-31 23:16:40 -0800387 if (err < 0) {
388 /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */
389 WARN_ON(err == -EMSGSIZE);
390 kfree_skb(skb);
391 goto errout;
392 }
Eric W. Biederman15e47302012-09-07 20:12:54 +0000393 rtnl_notify(skb, &init_net, portid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL);
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800394 return;
Thomas Grafdc738dd2006-08-15 00:33:35 -0700395errout:
396 if (err < 0)
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800397 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398}
399
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900400static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 struct netlink_callback *cb,
402 struct dn_fib_table *tb,
403 struct dn_zone *dz,
404 struct dn_fib_node *f)
405{
406 int i, s_i;
407
Patrick McHardyabcab262006-08-10 23:11:47 -0700408 s_i = cb->args[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 for(i = 0; f; i++, f = f->fn_next) {
410 if (i < s_i)
411 continue;
412 if (f->fn_state & DN_S_ZOMBIE)
413 continue;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000414 if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).portid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 cb->nlh->nlmsg_seq,
416 RTM_NEWROUTE,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900417 tb->n,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900419 f->fn_scope, &f->fn_key, dz->dz_order,
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -0700420 f->fn_info, NLM_F_MULTI) < 0) {
Patrick McHardyabcab262006-08-10 23:11:47 -0700421 cb->args[4] = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 return -1;
423 }
424 }
Patrick McHardyabcab262006-08-10 23:11:47 -0700425 cb->args[4] = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 return skb->len;
427}
428
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900429static __inline__ int dn_hash_dump_zone(struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 struct netlink_callback *cb,
431 struct dn_fib_table *tb,
432 struct dn_zone *dz)
433{
434 int h, s_h;
435
Patrick McHardyabcab262006-08-10 23:11:47 -0700436 s_h = cb->args[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 for(h = 0; h < dz->dz_divisor; h++) {
438 if (h < s_h)
439 continue;
440 if (h > s_h)
Patrick McHardyabcab262006-08-10 23:11:47 -0700441 memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL)
443 continue;
444 if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) {
Patrick McHardyabcab262006-08-10 23:11:47 -0700445 cb->args[3] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return -1;
447 }
448 }
Patrick McHardyabcab262006-08-10 23:11:47 -0700449 cb->args[3] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 return skb->len;
451}
452
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900453static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb,
454 struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900456 int m, s_m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 struct dn_zone *dz;
458 struct dn_hash *table = (struct dn_hash *)tb->data;
459
Patrick McHardyabcab262006-08-10 23:11:47 -0700460 s_m = cb->args[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 read_lock(&dn_fib_tables_lock);
462 for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) {
463 if (m < s_m)
464 continue;
465 if (m > s_m)
Patrick McHardyabcab262006-08-10 23:11:47 -0700466 memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) {
Patrick McHardyabcab262006-08-10 23:11:47 -0700469 cb->args[2] = m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 read_unlock(&dn_fib_tables_lock);
471 return -1;
472 }
473 }
474 read_unlock(&dn_fib_tables_lock);
Patrick McHardyabcab262006-08-10 23:11:47 -0700475 cb->args[2] = m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900477 return skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478}
479
Patrick McHardyabcab262006-08-10 23:11:47 -0700480int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
481{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900482 struct net *net = sock_net(skb->sk);
Patrick McHardyabcab262006-08-10 23:11:47 -0700483 unsigned int h, s_h;
484 unsigned int e = 0, s_e;
485 struct dn_fib_table *tb;
486 struct hlist_node *node;
487 int dumped = 0;
488
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800489 if (!net_eq(net, &init_net))
Denis V. Lunevb8542722007-12-01 00:21:31 +1100490 return 0;
491
Patrick McHardyabcab262006-08-10 23:11:47 -0700492 if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
David S. Miller3f7a3282012-06-26 21:47:21 -0700493 ((struct rtmsg *)nlmsg_data(cb->nlh))->rtm_flags&RTM_F_CLONED)
Patrick McHardyabcab262006-08-10 23:11:47 -0700494 return dn_cache_dump(skb, cb);
495
496 s_h = cb->args[0];
497 s_e = cb->args[1];
498
499 for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) {
500 e = 0;
501 hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) {
502 if (e < s_e)
503 goto next;
504 if (dumped)
505 memset(&cb->args[2], 0, sizeof(cb->args) -
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900506 2 * sizeof(cb->args[0]));
Patrick McHardyabcab262006-08-10 23:11:47 -0700507 if (tb->dump(tb, skb, cb) < 0)
508 goto out;
509 dumped = 1;
510next:
511 e++;
512 }
513 }
514out:
515 cb->args[1] = e;
516 cb->args[0] = h;
517
518 return skb->len;
519}
520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
522{
523 struct dn_hash *table = (struct dn_hash *)tb->data;
524 struct dn_fib_node *new_f, *f, **fp, **del_fp;
525 struct dn_zone *dz;
526 struct dn_fib_info *fi;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900527 int z = r->rtm_dst_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 int type = r->rtm_type;
529 dn_fib_key_t key;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900530 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900532 if (z > 16)
533 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 dz = table->dh_zones[z];
536 if (!dz && !(dz = dn_new_zone(table, z)))
537 return -ENOBUFS;
538
539 dz_key_0(key);
540 if (rta->rta_dst) {
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800541 __le16 dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 memcpy(&dst, rta->rta_dst, 2);
543 if (dst & ~DZ_MASK(dz))
544 return -EINVAL;
545 key = dz_key(dst, dz);
546 }
547
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900548 if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
549 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 if (dz->dz_nent > (dz->dz_divisor << 2) &&
552 dz->dz_divisor > DN_MAX_DIVISOR &&
553 (z==16 || (1<<z) > dz->dz_divisor))
554 dn_rehash_zone(dz);
555
556 fp = dn_chain_p(key, dz);
557
558 DN_FIB_SCAN(f, fp) {
559 if (dn_key_leq(key, f->fn_key))
560 break;
561 }
562
563 del_fp = NULL;
564
565 if (f && (f->fn_state & DN_S_ZOMBIE) &&
566 dn_key_eq(f->fn_key, key)) {
567 del_fp = fp;
568 fp = &f->fn_next;
569 f = *fp;
570 goto create;
571 }
572
573 DN_FIB_SCAN_KEY(f, fp, key) {
574 if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority)
575 break;
576 }
577
578 if (f && dn_key_eq(f->fn_key, key) &&
579 fi->fib_priority == DN_FIB_INFO(f)->fib_priority) {
580 struct dn_fib_node **ins_fp;
581
582 err = -EEXIST;
583 if (n->nlmsg_flags & NLM_F_EXCL)
584 goto out;
585
586 if (n->nlmsg_flags & NLM_F_REPLACE) {
587 del_fp = fp;
588 fp = &f->fn_next;
589 f = *fp;
590 goto replace;
591 }
592
593 ins_fp = fp;
594 err = -EEXIST;
595
596 DN_FIB_SCAN_KEY(f, fp, key) {
597 if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority)
598 break;
Joe Perchesf64f9e72009-11-29 16:55:45 -0800599 if (f->fn_type == type &&
600 f->fn_scope == r->rtm_scope &&
601 DN_FIB_INFO(f) == fi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 goto out;
603 }
604
605 if (!(n->nlmsg_flags & NLM_F_APPEND)) {
606 fp = ins_fp;
607 f = *fp;
608 }
609 }
610
611create:
612 err = -ENOENT;
613 if (!(n->nlmsg_flags & NLM_F_CREATE))
614 goto out;
615
616replace:
617 err = -ENOBUFS;
Robert P. J. Dayc3762222007-02-10 01:45:03 -0800618 new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 if (new_f == NULL)
620 goto out;
621
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 new_f->fn_key = key;
623 new_f->fn_type = type;
624 new_f->fn_scope = r->rtm_scope;
625 DN_FIB_INFO(new_f) = fi;
626
627 new_f->fn_next = f;
628 write_lock_bh(&dn_fib_tables_lock);
629 *fp = new_f;
630 write_unlock_bh(&dn_fib_tables_lock);
631 dz->dz_nent++;
632
633 if (del_fp) {
634 f = *del_fp;
635 write_lock_bh(&dn_fib_tables_lock);
636 *del_fp = f->fn_next;
637 write_unlock_bh(&dn_fib_tables_lock);
638
639 if (!(f->fn_state & DN_S_ZOMBIE))
640 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
641 if (f->fn_state & DN_S_ACCESSED)
642 dn_rt_cache_flush(-1);
643 dn_free_node(f);
644 dz->dz_nent--;
645 } else {
646 dn_rt_cache_flush(-1);
647 }
648
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900649 dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900651 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652out:
653 dn_fib_release_info(fi);
654 return err;
655}
656
657
658static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
659{
660 struct dn_hash *table = (struct dn_hash*)tb->data;
661 struct dn_fib_node **fp, **del_fp, *f;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900662 int z = r->rtm_dst_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 struct dn_zone *dz;
664 dn_fib_key_t key;
665 int matched;
666
667
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900668 if (z > 16)
669 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 if ((dz = table->dh_zones[z]) == NULL)
672 return -ESRCH;
673
674 dz_key_0(key);
675 if (rta->rta_dst) {
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800676 __le16 dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 memcpy(&dst, rta->rta_dst, 2);
678 if (dst & ~DZ_MASK(dz))
679 return -EINVAL;
680 key = dz_key(dst, dz);
681 }
682
683 fp = dn_chain_p(key, dz);
684
685 DN_FIB_SCAN(f, fp) {
686 if (dn_key_eq(f->fn_key, key))
687 break;
688 if (dn_key_leq(key, f->fn_key))
689 return -ESRCH;
690 }
691
692 matched = 0;
693 del_fp = NULL;
694 DN_FIB_SCAN_KEY(f, fp, key) {
695 struct dn_fib_info *fi = DN_FIB_INFO(f);
696
697 if (f->fn_state & DN_S_ZOMBIE)
698 return -ESRCH;
699
700 matched++;
701
702 if (del_fp == NULL &&
703 (!r->rtm_type || f->fn_type == r->rtm_type) &&
704 (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900705 (!r->rtm_protocol ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 fi->fib_protocol == r->rtm_protocol) &&
707 dn_fib_nh_match(r, n, rta, fi) == 0)
708 del_fp = fp;
709 }
710
711 if (del_fp) {
712 f = *del_fp;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900713 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715 if (matched != 1) {
716 write_lock_bh(&dn_fib_tables_lock);
717 *del_fp = f->fn_next;
718 write_unlock_bh(&dn_fib_tables_lock);
719
720 if (f->fn_state & DN_S_ACCESSED)
721 dn_rt_cache_flush(-1);
722 dn_free_node(f);
723 dz->dz_nent--;
724 } else {
725 f->fn_state |= DN_S_ZOMBIE;
726 if (f->fn_state & DN_S_ACCESSED) {
727 f->fn_state &= ~DN_S_ACCESSED;
728 dn_rt_cache_flush(-1);
729 }
730 if (++dn_fib_hash_zombies > 128)
731 dn_fib_flush();
732 }
733
734 return 0;
735 }
736
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900737 return -ESRCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738}
739
740static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table)
741{
742 int found = 0;
743 struct dn_fib_node *f;
744
745 while((f = *fp) != NULL) {
746 struct dn_fib_info *fi = DN_FIB_INFO(f);
747
748 if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) {
749 write_lock_bh(&dn_fib_tables_lock);
750 *fp = f->fn_next;
751 write_unlock_bh(&dn_fib_tables_lock);
752
753 dn_free_node(f);
754 found++;
755 continue;
756 }
757 fp = &f->fn_next;
758 }
759
760 return found;
761}
762
763static int dn_fib_table_flush(struct dn_fib_table *tb)
764{
765 struct dn_hash *table = (struct dn_hash *)tb->data;
766 struct dn_zone *dz;
767 int found = 0;
768
769 dn_fib_hash_zombies = 0;
770 for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
771 int i;
772 int tmp = 0;
773 for(i = dz->dz_divisor-1; i >= 0; i--)
774 tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table);
775 dz->dz_nent -= tmp;
776 found += tmp;
777 }
778
779 return found;
780}
781
David S. Millerbef55ae2011-03-12 17:17:10 -0500782static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowidn *flp, struct dn_fib_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900784 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 struct dn_zone *dz;
786 struct dn_hash *t = (struct dn_hash *)tb->data;
787
788 read_lock(&dn_fib_tables_lock);
789 for(dz = t->dh_zone_list; dz; dz = dz->dz_next) {
790 struct dn_fib_node *f;
David S. Millerbef55ae2011-03-12 17:17:10 -0500791 dn_fib_key_t k = dz_key(flp->daddr, dz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
793 for(f = dz_chain(k, dz); f; f = f->fn_next) {
794 if (!dn_key_eq(k, f->fn_key)) {
795 if (dn_key_leq(k, f->fn_key))
796 break;
797 else
798 continue;
799 }
800
801 f->fn_state |= DN_S_ACCESSED;
802
803 if (f->fn_state&DN_S_ZOMBIE)
804 continue;
805
David S. Millerbef55ae2011-03-12 17:17:10 -0500806 if (f->fn_scope < flp->flowidn_scope)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 continue;
808
809 err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res);
810
811 if (err == 0) {
812 res->type = f->fn_type;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900813 res->scope = f->fn_scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 res->prefixlen = dz->dz_order;
815 goto out;
816 }
817 if (err < 0)
818 goto out;
819 }
820 }
821 err = 1;
822out:
823 read_unlock(&dn_fib_tables_lock);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900824 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825}
826
827
Patrick McHardy2dfe55b2006-08-10 23:08:33 -0700828struct dn_fib_table *dn_fib_get_table(u32 n, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900830 struct dn_fib_table *t;
Patrick McHardyabcab262006-08-10 23:11:47 -0700831 struct hlist_node *node;
832 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900834 if (n < RT_TABLE_MIN)
835 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900837 if (n > RT_TABLE_MAX)
838 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Patrick McHardyabcab262006-08-10 23:11:47 -0700840 h = n & (DN_FIB_TABLE_HASHSZ - 1);
841 rcu_read_lock();
842 hlist_for_each_entry_rcu(t, node, &dn_fib_table_hash[h], hlist) {
843 if (t->n == n) {
844 rcu_read_unlock();
845 return t;
846 }
847 }
848 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900850 if (!create)
851 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Joe Perchese87cc472012-05-13 21:56:26 +0000853 if (in_interrupt()) {
854 net_dbg_ratelimited("DECnet: BUG! Attempt to create routing table from interrupt\n");
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900855 return NULL;
856 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900858 t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash),
Arnaldo Carvalho de Meloe6b61102006-11-21 01:16:24 -0200859 GFP_KERNEL);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900860 if (t == NULL)
861 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900863 t->n = n;
864 t->insert = dn_fib_table_insert;
865 t->delete = dn_fib_table_delete;
866 t->lookup = dn_fib_table_lookup;
867 t->flush = dn_fib_table_flush;
868 t->dump = dn_fib_table_dump;
Patrick McHardyabcab262006-08-10 23:11:47 -0700869 hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900871 return t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872}
873
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874struct dn_fib_table *dn_fib_empty_table(void)
875{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900876 u32 id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900878 for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++)
Patrick McHardyabcab262006-08-10 23:11:47 -0700879 if (dn_fib_get_table(id, 0) == NULL)
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900880 return dn_fib_get_table(id, 1);
881 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882}
883
Patrick McHardyabcab262006-08-10 23:11:47 -0700884void dn_fib_flush(void)
885{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900886 int flushed = 0;
887 struct dn_fib_table *tb;
Patrick McHardyabcab262006-08-10 23:11:47 -0700888 struct hlist_node *node;
889 unsigned int h;
890
891 for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) {
892 hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist)
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900893 flushed += tb->flush(tb);
894 }
Patrick McHardyabcab262006-08-10 23:11:47 -0700895
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900896 if (flushed)
897 dn_rt_cache_flush(-1);
Patrick McHardyabcab262006-08-10 23:11:47 -0700898}
899
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900void __init dn_fib_table_init(void)
901{
902 dn_hash_kmem = kmem_cache_create("dn_fib_info_cache",
903 sizeof(struct dn_fib_info),
904 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +0900905 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906}
907
908void __exit dn_fib_table_cleanup(void)
909{
Patrick McHardyabcab262006-08-10 23:11:47 -0700910 struct dn_fib_table *t;
911 struct hlist_node *node, *next;
912 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
Patrick McHardyabcab262006-08-10 23:11:47 -0700914 write_lock(&dn_fib_tables_lock);
915 for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) {
916 hlist_for_each_entry_safe(t, node, next, &dn_fib_table_hash[h],
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900917 hlist) {
Patrick McHardyabcab262006-08-10 23:11:47 -0700918 hlist_del(&t->hlist);
919 kfree(t);
920 }
921 }
922 write_unlock(&dn_fib_tables_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923}