summaryrefslogtreecommitdiffstats
path: root/proto/ospf/topology.c
blob: db15f63c666d4fc2393d0cad9f7d93acecea9325 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
/*
 *	BIRD -- OSPF Topological Database
 *
 *	(c) 1999        Martin Mares <mj@ucw.cz>
 *	(c) 1999 - 2000 Ondrej Filip <feela@network.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#define LOCAL_DEBUG

#include "nest/bird.h"
#include "lib/string.h"

#include "ospf.h"

#define HASH_DEF_ORDER 6		/* FIXME: Increase */
#define HASH_HI_MARK *4
#define HASH_HI_STEP 2
#define HASH_HI_MAX 16
#define HASH_LO_MARK /5
#define HASH_LO_STEP 2
#define HASH_LO_MIN 8

void *
originate_rt_lsa_body(struct ospf_area *oa, u16 *length, struct proto_ospf *p)
{
  struct ospf_iface *ifa;
  int j=0,k=0,v=0,e=0,b=0;
  u16 i=0;
  struct ospf_lsa_rt *rt;
  struct ospf_lsa_rt_link *ln;
  struct ospf_neighbor *neigh;
  struct top_hash_entry *old;
  struct proto_ospf *po=(struct proto_ospf *)p;

  DBG("%s: Originating RT_lsa body for area \"%I\".\n", po->proto.name, oa->areaid);

  WALK_LIST (ifa, p->iface_list) i++;
  {
    if((ifa->an==oa->areaid) && (ifa->state!=OSPF_IS_DOWN))
    {
      i++;
      if(ifa->type==OSPF_IT_VLINK) v=1;
    }
  }
  rt=mb_allocz(p->proto.pool, sizeof(struct ospf_lsa_rt)+
    i*sizeof(struct ospf_lsa_rt_link));
  if((p->areano>1) && (!oa->stub)) e=1;
  rt->VEB=(v>>LSA_RT_V)+(e>>LSA_RT_E)+(b>>LSA_RT_B);
  ln=(struct ospf_lsa_rt_link *)(rt+1);

  WALK_LIST (ifa, p->iface_list)
  {
    if((ifa->an==oa->areaid) && (ifa->state!=OSPF_IS_DOWN))
    {
      if(ifa->state==OSPF_IS_LOOP)
      {
        ln->type=3;
	ln->id=ipa_to_u32(ifa->iface->addr->ip);
	ln->data=0xffffffff;
	ln->metric=0;
	ln->notos=0;
      }
      else
      {
        switch(ifa->type)
	{
          case OSPF_IT_PTP:		/* rfc2328 - pg126 */
            neigh=(struct ospf_neighbor *)HEAD(ifa->neigh_list);
	    if((neigh!=NULL) || (neigh->state==NEIGHBOR_FULL))
	    {
               ln->type=LSART_PTP;
               ln->id=neigh->rid;
               ln->metric=ifa->cost;
               ln->notos=0;
               if(ifa->iface->flags && IA_UNNUMBERED)
               {
                 ln->data=ifa->iface->index;
               }
               else
               {
                 ln->id=ipa_to_u32(ifa->iface->addr->ip);
               }
	    }
	    else
	    {
	      if(ifa->state==OSPF_IS_PTP)
              {
		ln->type=LSART_STUB;
		ln->id=ln->id=ipa_to_u32(ifa->iface->addr->opposite);
		ln->metric=ifa->cost;
		ln->notos=0;
		ln->data=0xffffffff;
              }
              else
              {
		i--; /* No link added */
              }
	    }
            break;
	  case OSPF_IT_BCAST: /*FIXME Go on */
	  case OSPF_IT_NBMA:
            if(ifa->state==OSPF_IS_WAITING)
            {
              ln->type=LSART_STUB;
	      ln->id=ipa_to_u32(ifa->iface->addr->prefix);
	      ln->data=ipa_to_u32(ipa_mkmask(ifa->iface->addr->pxlen));
              ln->metric=ifa->cost;
              ln->notos=0;
            }
	    else
            {
              j=0,k=0;
              WALK_LIST(neigh, ifa->neigh_list)
	      {
	        if((neigh->rid==ifa->drid) &&
	          (neigh->state==NEIGHBOR_FULL)) k=1;
		if(neigh->state==NEIGHBOR_FULL) j=1;
	      }
              if(((ifa->state=OSPF_IS_DR) && (j==1)) || (k==1))
	      {
	        ln->type=LSART_NET;
		ln->id=ipa_to_u32(ifa->drip);
		ln->data=ipa_to_u32(ifa->iface->addr->ip);
		ln->metric=ifa->cost;
		ln->notos=0;
	      }
	      else
	      {
                ln->type=LSART_STUB;
  	        ln->id=ipa_to_u32(ifa->iface->addr->prefix);
	        ln->data=ipa_to_u32(ipa_mkmask(ifa->iface->addr->pxlen));
                ln->metric=ifa->cost;
                ln->notos=0;
	      }
            }
	    break;
	  case OSPF_IT_VLINK:	/* FIXME Add virtual links! */
	    i--;
	    break;
	}
      }
      if(ifa->type==OSPF_IT_VLINK) v=1;
    }
    ln=(ln+1);
  }
  rt->links=i;
  *length=i*sizeof(struct ospf_lsa_rt_link)+sizeof(struct ospf_lsa_rt)+
    sizeof(struct ospf_lsa_header);
  return rt;
}
	

void
addifa_rtlsa(struct ospf_iface *ifa)
{
  struct ospf_area *oa;
  struct proto_ospf *po;
  u32 rtid;
  struct top_graph_rtlsa_link *li, *lih;

  po=ifa->proto;
  rtid=po->proto.cf->global->router_id;
  DBG("%s: New OSPF area \"%d\" adding.\n", po->proto.name, ifa->an);
  oa=NULL;


  WALK_LIST(NODE oa,po->area_list)
  {
    if(oa->areaid==ifa->an) break;
  }

  if(EMPTY_LIST(po->area_list) || (oa->areaid!=ifa->an))	/* New area */
  {
    struct ospf_lsa_header *lsa;

    oa=mb_allocz(po->proto.pool, sizeof(struct ospf_area));
    add_tail(&po->area_list,NODE oa);
    oa->areaid=ifa->an;
    oa->gr=ospf_top_new(po);
    s_init_list(&(oa->lsal));
    oa->rt=NULL;
    po->areano++;
    DBG("%s: New OSPF area \"%d\" added.\n", po->proto.name, ifa->an);
  }

  ifa->oa=oa;

  oa->rt=originate_rt_lsa(oa,po);
  flood_lsa(NULL,NULL,&oa->rt->lsa,po,NULL,oa);
}

struct top_hash_entry *
originate_rt_lsa(struct ospf_area *oa, struct proto_ospf *po)
{
  struct ospf_lsa_header lsa;
  u32 rtid=po->proto.cf->global->router_id;
  struct top_hash_entry *en;
  void *body;

  DBG("%s: Originating RT_lsa for area \"%d\".\n", po->proto.name, oa->areaid);

  lsa.age=0;
  lsa.id=rtid;
  lsa.type=LSA_T_RT;
  lsa.rt=rtid;
  if(oa->rt==NULL)
  {
    lsa.sn=LSA_INITSEQNO;
  }
  else
  {
    lsa.sn=oa->rt->lsa.sn+1;
  }
  body=originate_rt_lsa_body(oa, &lsa.length, po);
  lsasum_calculate(&lsa,body,po);
  en=lsa_install_new(&lsa, body, oa);
  return en;
}

  

static void
ospf_top_ht_alloc(struct top_graph *f)
{
  f->hash_size = 1 << f->hash_order;
  f->hash_mask = f->hash_size - 1;
  if (f->hash_order > HASH_HI_MAX - HASH_HI_STEP)
    f->hash_entries_max = ~0;
  else
    f->hash_entries_max = f->hash_size HASH_HI_MARK;
  if (f->hash_order < HASH_LO_MIN + HASH_LO_STEP)
    f->hash_entries_min = 0;
  else
    f->hash_entries_min = f->hash_size HASH_LO_MARK;
  DBG("Allocating OSPF hash of order %d: %d hash_entries, %d low, %d high\n",
      f->hash_order, f->hash_size, f->hash_entries_min, f->hash_entries_max);
  f->hash_table = mb_alloc(f->pool, f->hash_size * sizeof(struct top_hash_entry *));
  bzero(f->hash_table, f->hash_size * sizeof(struct top_hash_entry *));
}

static inline void
ospf_top_ht_free(struct top_hash_entry **h)
{
  mb_free(h);
}

static inline u32
ospf_top_hash_u32(u32 a)
{
  /* Shamelessly stolen from IP address hashing in ipv4.h */
  a ^= a >> 16;
  a ^= a << 10;
  return a;
}

static inline unsigned
ospf_top_hash(struct top_graph *f, u32 lsaid, u32 rtrid, u32 type)
{
  return (ospf_top_hash_u32(lsaid) + ospf_top_hash_u32(rtrid) + type) & f->hash_mask;
}

struct top_graph *
ospf_top_new(struct proto_ospf *p)
{
  struct top_graph *f;

  f = mb_allocz(p->proto.pool, sizeof(struct top_graph));
  f->pool = p->proto.pool;
  f->hash_slab = sl_new(f->pool, sizeof(struct top_hash_entry));
  f->hash_order = HASH_DEF_ORDER;
  ospf_top_ht_alloc(f);
  f->hash_entries = 0;
  f->hash_entries_min = 0;
  return f;
}

void
ospf_top_free(struct top_graph *f)
{
  rfree(f->hash_slab);
  ospf_top_ht_free(f->hash_table);
  mb_free(f);
}

static void
ospf_top_rehash(struct top_graph *f, int step)
{
  unsigned int oldn, oldh;
  struct top_hash_entry **n, **oldt, **newt, *e, *x;

  oldn = f->hash_size;
  oldt = f->hash_table;
  DBG("Re-hashing topology hash from order %d to %d\n", f->hash_order, f->hash_order+step);
  f->hash_order += step;
  ospf_top_ht_alloc(f);
  newt = f->hash_table;

  for(oldh=0; oldh < oldn; oldh++)
    {
      e = oldt[oldh];
      while (e)
	{
	  x = e->next;
	  n = newt + ospf_top_hash(f, e->lsa.id, e->lsa.rt, e->lsa.type);
	  e->next = *n;
	  *n = e;
	  e = x;
	}
    }
  ospf_top_ht_free(oldt);
}

struct top_hash_entry *
ospf_hash_find_header(struct top_graph *f, struct ospf_lsa_header *h)
{
  return ospf_hash_find(f,h->id,h->rt,h->type);
}

struct top_hash_entry *
ospf_hash_get_header(struct top_graph *f, struct ospf_lsa_header *h)
{
  return ospf_hash_get(f,h->id,h->rt,h->type);
}

struct top_hash_entry *
ospf_hash_find(struct top_graph *f, u32 lsa, u32 rtr, u32 type)
{
  struct top_hash_entry *e = f->hash_table[ospf_top_hash(f, lsa, rtr, type)];

  while (e && (e->lsa.id != lsa || e->lsa.rt != rtr || e->lsa.type != type))
    e = e->next;
  return e;
}

struct top_hash_entry *
ospf_hash_get(struct top_graph *f, u32 lsa, u32 rtr, u32 type)
{
  struct top_hash_entry **ee = f->hash_table + ospf_top_hash(f, lsa, rtr, type);
  struct top_hash_entry *e = *ee;

  while (e && (e->lsa.id != lsa || e->lsa.rt != rtr || e->lsa.type != type))
    e = e->next;
  if (e)
    return e;
  e = sl_alloc(f->hash_slab);
  e->lsa.id = lsa;
  e->lsa.rt = rtr;
  e->lsa.type = type;
  e->lsa_body = NULL;
  e->nhi=NULL;
  e->next=*ee;		/* MJ you forgot this :-) */
  *ee=e;
  if (f->hash_entries++ > f->hash_entries_max)
    ospf_top_rehash(f, HASH_HI_STEP);
  return e;
}

void
ospf_hash_delete(struct top_graph *f, struct top_hash_entry *e)
{
  unsigned int h = ospf_top_hash(f, e->lsa.id, e->lsa.rt, e->lsa.type);
  struct top_hash_entry **ee = f->hash_table + h;

  while (*ee)
    {
      if (*ee == e)
	{
	  *ee = e->next;
	  sl_free(f->hash_slab, e);
	  if (f->hash_entries-- < f->hash_entries_min)
	    ospf_top_rehash(f, -HASH_LO_STEP);
	  return;
	}
      ee = &((*ee)->next);
    }
  bug("ospf_hash_delete() called for invalid node");
}

void
ospf_top_dump(struct top_graph *f)
{
  unsigned int i;
  debug("Hash entries: %d\n", f->hash_entries);

  for(i=0; i<f->hash_size; i++)
    {
      struct top_hash_entry *e = f->hash_table[i];
      while (e)
	{
	  debug("\t%04x %08x %08x %p\n", e->lsa.type, e->lsa.id,
            e->lsa.rt, e->lsa_body);
	  e = e->next;
	}
    }
}