aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/adj/adj_mcast.c
blob: 755abfd4639bb8d306238f5bcc15763b5c74d0fe (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
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vnet/adj/adj_mcast.h>
#include <vnet/adj/adj_internal.h>
#include <vnet/fib/fib_walk.h>
#include <vnet/ip/ip.h>

/*
 * The 'DB' of all mcast adjs.
 * There is only one mcast per-interface per-protocol, so this is a per-interface
 * vector
 */
static adj_index_t *adj_mcasts[FIB_PROTOCOL_MAX];

static u32
adj_get_mcast_node (fib_protocol_t proto)
{
    switch (proto) {
    case FIB_PROTOCOL_IP4:
	return (ip4_rewrite_mcast_node.index);
    case FIB_PROTOCOL_IP6:
	return (ip6_rewrite_mcast_node.index);
    case FIB_PROTOCOL_MPLS:
	break;
    }
    ASSERT(0);
    return (0);
}

/*
 * adj_mcast_add_or_lock
 *
 * The next_hop address here is used for source address selection in the DP.
 * The mcast adj is added to an interface's connected prefix, the next-hop
 * passed here is the local prefix on the same interface.
 */
adj_index_t
adj_mcast_add_or_lock (fib_protocol_t proto,
                       vnet_link_t link_type,
		       u32 sw_if_index)
{
    ip_adjacency_t * adj;

    vec_validate_init_empty(adj_mcasts[proto], sw_if_index, ADJ_INDEX_INVALID);

    if (ADJ_INDEX_INVALID == adj_mcasts[proto][sw_if_index])
    {
        vnet_main_t *vnm;

        vnm = vnet_get_main();
	adj = adj_alloc(proto);

	adj->lookup_next_index = IP_LOOKUP_NEXT_MCAST;
	adj->ia_nh_proto = proto;
	adj->ia_link = link_type;
	adj_mcasts[proto][sw_if_index] = adj_get_index(adj);
        adj_lock(adj_get_index(adj));

	vnet_rewrite_init(vnm, sw_if_index,
			  adj_get_mcast_node(proto),
			  vnet_tx_node_index_for_sw_interface(vnm, sw_if_index),
			  &adj->rewrite_header);

	/*
	 * we need a rewrite where the destination IP address is converted
	 * to the appropriate link-layer address. This is interface specific.
	 * So ask the interface to do it.
	 */
	vnet_update_adjacency_for_sw_interface(vnm, sw_if_index,
                                               adj_get_index(adj));
    }
    else
    {
	adj = adj_get(adj_mcasts[proto][sw_if_index]);
        adj_lock(adj_get_index(adj));
    }

    return (adj_get_index(adj));
}

/**
 * adj_mcast_update_rewrite
 *
 * Update the adjacency's rewrite string. A NULL string implies the
 * rewirte is reset (i.e. when ARP/ND etnry is gone).
 * NB: the adj being updated may be handling traffic in the DP.
 */
void
adj_mcast_update_rewrite (adj_index_t adj_index,
                          u8 *rewrite,
                          u8 offset,
                          u32 mask)
{
    ip_adjacency_t *adj;

    ASSERT(ADJ_INDEX_INVALID != adj_index);

    adj = adj_get(adj_index);

    /*
     * update the adj's rewrite string and build the arc
     * from the rewrite node to the interface's TX node
     */
    adj_nbr_update_rewrite_internal(adj, IP_LOOKUP_NEXT_MCAST,
                                    adj_get_mcast_node(adj->ia_nh_proto),
                                    vnet_tx_node_index_for_sw_interface(
                                        vnet_get_main(),
                                        adj->rewrite_header.sw_if_index),
                                    rewrite);
    /*
     * set the fields corresponding to the mcast IP address rewrite
     * The mask must be stored in network byte order, since the packet's
     * IP address will also be in network order.
     */
    adj->rewrite_header.dst_mcast_offset = offset;
    adj->rewrite_header.dst_mcast_mask = clib_host_to_net_u32(mask);
}

/**
 * adj_mcast_midchain_update_rewrite
 *
 * Update the adjacency's rewrite string. A NULL string implies the
 * rewirte is reset (i.e. when ARP/ND etnry is gone).
 * NB: the adj being updated may be handling traffic in the DP.
 */
void
adj_mcast_midchain_update_rewrite (adj_index_t adj_index,
                                   adj_midchain_fixup_t fixup,
                                   adj_flags_t flags,
                                   u8 *rewrite,
                                   u8 offset,
                                   u32 mask)
{
    ip_adjacency_t *adj;

    ASSERT(ADJ_INDEX_INVALID != adj_index);

    adj = adj_get(adj_index);

    /*
     * one time only update. since we don't support chainging the tunnel
     * src,dst, this is all we need.
     */
    ASSERT(adj->lookup_next_index == IP_LOOKUP_NEXT_MCAST);
    /*
     * tunnels can always provide a rewrite.
     */
    ASSERT(NULL != rewrite);

    adj_midchain_setup(adj_index, fixup, flags);

    /*
     * update the adj's rewrite string and build the arc
     * from the rewrite node to the interface's TX node
     */
    adj_nbr_update_rewrite_internal(adj, IP_LOOKUP_NEXT_MCAST_MIDCHAIN,
                                    adj_get_mcast_node(adj->ia_nh_proto),
                                    vnet_tx_node_index_for_sw_interface(
                                        vnet_get_main(),
                                        adj->rewrite_header.sw_if_index),
                                    rewrite);

    /*
     * set the fields corresponding to the mcast IP address rewrite
     * The mask must be stored in network byte order, since the packet's
     * IP address will also be in network order.
     */
    adj->rewrite_header.dst_mcast_offset = offset;
    adj->rewrite_header.dst_mcast_mask = clib_host_to_net_u32(mask);
}

void
adj_mcast_remove (fib_protocol_t proto,
		  u32 sw_if_index)
{
    ASSERT(sw_if_index < vec_len(adj_mcasts[proto]));

    adj_mcasts[proto][sw_if_index] = ADJ_INDEX_INVALID;
}

static clib_error_t *
adj_mcast_interface_state_change (vnet_main_t * vnm,
				  u32 sw_if_index,
				  u32 flags)
{
    /*
     * for each mcast on the interface trigger a walk back to the children
     */
    fib_protocol_t proto;
    ip_adjacency_t *adj;


    for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
    {
	if (sw_if_index >= vec_len(adj_mcasts[proto]) ||
	    ADJ_INDEX_INVALID == adj_mcasts[proto][sw_if_index])
	    continue;

	adj = adj_get(adj_mcasts[proto][sw_if_index]);

	fib_node_back_walk_ctx_t bw_ctx = {
	    .fnbw_reason = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP ?
			    FIB_NODE_BW_REASON_FLAG_INTERFACE_UP :
			    FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN),
	};

	fib_walk_sync(FIB_NODE_TYPE_ADJ, adj_get_index(adj), &bw_ctx);
    }

    return (NULL);
}

VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(adj_mcast_interface_state_change);

/**
 * @brief Invoked on each SW interface of a HW interface when the
 * HW interface state changes
 */
static void
adj_nbr_hw_sw_interface_state_change (vnet_main_t * vnm,
                                      u32 sw_if_index,
                                      void *arg)
{
    adj_mcast_interface_state_change(vnm, sw_if_index, (uword) arg);
}

/**
 * @brief Registered callback for HW interface state changes
 */
static clib_error_t *
adj_mcast_hw_interface_state_change (vnet_main_t * vnm,
                                     u32 hw_if_index,
                                     u32 flags)
{
    /*
     * walk SW interfaces on the HW
     */
    uword sw_flags;

    sw_flags = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) ?
                VNET_SW_INTERFACE_FLAG_ADMIN_UP :
                0);

    vnet_hw_interface_walk_sw(vnm, hw_if_index,
                              adj_nbr_hw_sw_interface_state_change,
                              (void*) sw_flags);

    return (NULL);
}

VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(
    adj_mcast_hw_interface_state_change);

static clib_error_t *
adj_mcast_interface_delete (vnet_main_t * vnm,
			    u32 sw_if_index,
			    u32 is_add)
{
    /*
     * for each mcast on the interface trigger a walk back to the children
     */
    fib_protocol_t proto;
    ip_adjacency_t *adj;

    if (is_add)
    {
	/*
	 * not interested in interface additions. we will not back walk
	 * to resolve paths through newly added interfaces. Why? The control
	 * plane should have the brains to add interfaces first, then routes.
	 * So the case where there are paths with a interface that matches
	 * one just created is the case where the path resolved through an
	 * interface that was deleted, and still has not been removed. The
	 * new interface added, is NO GUARANTEE that the interface being
	 * added now, even though it may have the same sw_if_index, is the
	 * same interface that the path needs. So tough!
	 * If the control plane wants these routes to resolve it needs to
	 * remove and add them again.
	 */
	return (NULL);
    }

    for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
    {
	if (sw_if_index >= vec_len(adj_mcasts[proto]) ||
	    ADJ_INDEX_INVALID == adj_mcasts[proto][sw_if_index])
	    continue;

	adj = adj_get(adj_mcasts[proto][sw_if_index]);

	fib_node_back_walk_ctx_t bw_ctx = {
	    .fnbw_reason =  FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE,
	};

	fib_walk_sync(FIB_NODE_TYPE_ADJ, adj_get_index(adj), &bw_ctx);
    }

    return (NULL);
}

VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_mcast_interface_delete);

/**
 * @brief Walk the multicast Adjacencies on a given interface
 */
void
adj_mcast_walk (u32 sw_if_index,
                fib_protocol_t proto,
                adj_walk_cb_t cb,
                void *ctx)
{
    if (vec_len(adj_mcasts[proto]) > sw_if_index)
    {
        if (ADJ_INDEX_INVALID != adj_mcasts[proto][sw_if_index])
        {
            cb(adj_mcasts[proto][sw_if_index], ctx);
        }
    }
}

u8*
format_adj_mcast (u8* s, va_list *ap)
{
    index_t index = va_arg(*ap, index_t);
    CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
    ip_adjacency_t * adj = adj_get(index);

    s = format(s, "%U-mcast: ",
               format_fib_protocol, adj->ia_nh_proto);
    if (adj->rewrite_header.flags & VNET_REWRITE_HAS_FEATURES)
        s = format(s, "[features] ");
    s = format (s, "%U",
		format_vnet_rewrite,
                &adj->rewrite_header, sizeof (adj->rewrite_data), 0);

    return (s);
}

u8*
format_adj_mcast_midchain (u8* s, va_list *ap)
{
    index_t index = va_arg(*ap, index_t);
    CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
    vnet_main_t * vnm = vnet_get_main();
    ip_adjacency_t * adj = adj_get(index);

    s = format(s, "%U-mcast-midchain: ",
               format_fib_protocol, adj->ia_nh_proto);
    s = format (s, "%U",
		format_vnet_rewrite,
		vnm->vlib_main, &adj->rewrite_header,
                sizeof (adj->rewrite_data), 0);
    s = format (s, "\n%Ustacked-on:\n%U%U",
		format_white_space, indent,
		format_white_space, indent+2,
		format_dpo_id, &adj->sub_type.midchain.next_dpo, indent+2);

    return (s);
}


static void
adj_dpo_lock (dpo_id_t *dpo)
{
    adj_lock(dpo->dpoi_index);
}
static void
adj_dpo_unlock (dpo_id_t *dpo)
{
    adj_unlock(dpo->dpoi_index);
}

const static dpo_vft_t adj_mcast_dpo_vft = {
    .dv_lock = adj_dpo_lock,
    .dv_unlock = adj_dpo_unlock,
    .dv_format = format_adj_mcast,
};
const static dpo_vft_t adj_mcast_midchain_dpo_vft = {
    .dv_lock = adj_dpo_lock,
    .dv_unlock = adj_dpo_unlock,
    .dv_format = format_adj_mcast_midchain,
};

/**
 * @brief The per-protocol VLIB graph nodes that are assigned to a mcast
 *        object.
 *
 * this means that these graph nodes are ones from which a mcast is the
 * parent object in the DPO-graph.
 */
const static char* const adj_mcast_ip4_nodes[] =
{
    "ip4-rewrite-mcast",
    NULL,
};
const static char* const adj_mcast_ip6_nodes[] =
{
    "ip6-rewrite-mcast",
    NULL,
};

const static char* const * const adj_mcast_nodes[DPO_PROTO_NUM] =
{
    [DPO_PROTO_IP4]  = adj_mcast_ip4_nodes,
    [DPO_PROTO_IP6]  = adj_mcast_ip6_nodes,
    [DPO_PROTO_MPLS] = NULL,
};

/**
 * @brief The per-protocol VLIB graph nodes that are assigned to a mcast
 *        object.
 *
 * this means that these graph nodes are ones from which a mcast is the
 * parent object in the DPO-graph.
 */
const static char* const adj_mcast_midchain_ip4_nodes[] =
{
    "ip4-mcast-midchain",
    NULL,
};
const static char* const adj_mcast_midchain_ip6_nodes[] =
{
    "ip6-mcast-midchain",
    NULL,
};

const static char* const * const adj_mcast_midchain_nodes[DPO_PROTO_NUM] =
{
    [DPO_PROTO_IP4]  = adj_mcast_midchain_ip4_nodes,
    [DPO_PROTO_IP6]  = adj_mcast_midchain_ip6_nodes,
    [DPO_PROTO_MPLS] = NULL,
};

/**
 * @brief Return the size of the adj DB.
 * This is only for testing purposes so an efficient implementation is not needed
 */
u32
adj_mcast_db_size (void)
{
    u32 n_adjs, sw_if_index;
    fib_protocol_t proto;

    n_adjs = 0;
    for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
    {
        for (sw_if_index = 0;
             sw_if_index < vec_len(adj_mcasts[proto]);
             sw_if_index++)
        {
            if (ADJ_INDEX_INVALID != adj_mcasts[proto][sw_if_index])
            {
                n_adjs++;
            }
        }
    }
    
    return (n_adjs);
}

void
adj_mcast_module_init (void)
{
    dpo_register(DPO_ADJACENCY_MCAST,
                 &adj_mcast_dpo_vft,
                 adj_mcast_nodes);
    dpo_register(DPO_ADJACENCY_MCAST_MIDCHAIN,
                 &adj_mcast_midchain_dpo_vft,
                 adj_mcast_midchain_nodes);
}