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
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
|
/*
* Copyright (c) 2015 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.
*/
/*
* ip/ip6.h: ip6 main include file
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_ip_ip6_h
#define included_ip_ip6_h
#include <vlib/mc.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/ip/lookup.h>
#include <vppinfra/bihash_24_8.h>
#include <vppinfra/bihash_template.h>
/*
* Default size of the ip6 fib hash table
*/
#define IP6_FIB_DEFAULT_HASH_NUM_BUCKETS (64 * 1024)
#define IP6_FIB_DEFAULT_HASH_MEMORY_SIZE (32<<20)
typedef struct {
ip6_address_t addr;
u32 dst_address_length;
u32 vrf_index;
} ip6_fib_key_t;
typedef struct {
/* Table ID (hash key) for this FIB. */
u32 table_id;
/* Index into FIB vector. */
u32 index;
/* flow hash configuration */
u32 flow_hash_config;
} ip6_fib_t;
struct ip6_main_t;
typedef void (ip6_add_del_route_function_t)
(struct ip6_main_t * im,
uword opaque,
ip6_fib_t * fib,
u32 flags,
ip6_address_t * address,
u32 address_length,
void * old_result,
void * new_result);
typedef struct {
ip6_add_del_route_function_t * function;
uword required_flags;
uword function_opaque;
} ip6_add_del_route_callback_t;
typedef void (ip6_add_del_interface_address_function_t)
(struct ip6_main_t * im,
uword opaque,
u32 sw_if_index,
ip6_address_t * address,
u32 address_length,
u32 if_address_index,
u32 is_del);
typedef struct {
ip6_add_del_interface_address_function_t * function;
uword function_opaque;
} ip6_add_del_interface_address_callback_t;
typedef enum {
/* First check access list to either permit or deny this
packet based on classification. */
IP6_RX_FEATURE_CHECK_ACCESS,
/* RPF check: verify that source address is reachable via
RX interface or via any interface. */
IP6_RX_FEATURE_CHECK_SOURCE_REACHABLE_VIA_RX,
IP6_RX_FEATURE_CHECK_SOURCE_REACHABLE_VIA_ANY,
/* IPSec */
IP6_RX_FEATURE_IPSEC,
/* Intercept and decap L2TPv3 packets. */
IP6_RX_FEATURE_L2TPV3,
/* vPath forwarding: won't return to call next feature
so any feature needed before vPath forwarding must be prior
to this entry */
IP6_RX_FEATURE_VPATH,
/* Must be last: perform forwarding lookup. */
IP6_RX_FEATURE_LOOKUP,
IP6_N_RX_FEATURE,
} ip6_rx_feature_type_t;
typedef struct ip6_main_t {
BVT(clib_bihash) ip6_lookup_table;
ip_lookup_main_t lookup_main;
/* bitmap / refcounts / vector of mask widths to search */
uword * non_empty_dst_address_length_bitmap;
u8 * prefix_lengths_in_search_order;
i32 dst_address_length_refcounts[129];
/* Vector of FIBs. */
ip6_fib_t * fibs;
ip6_address_t fib_masks[129];
/* Table index indexed by software interface. */
u32 * fib_index_by_sw_if_index;
/* Hash table mapping table id to fib index.
ID space is not necessarily dense; index space is dense. */
uword * fib_index_by_table_id;
/* Vector of functions to call when routes are added/deleted. */
ip6_add_del_route_callback_t * add_del_route_callbacks;
/* Hash table mapping interface rewrite adjacency index by sw if index. */
uword * interface_route_adj_index_by_sw_if_index;
/* Functions to call when interface address changes. */
ip6_add_del_interface_address_callback_t * add_del_interface_address_callbacks;
/* Template used to generate IP6 neighbor solicitation packets. */
vlib_packet_template_t discover_neighbor_packet_template;
u32 * discover_neighbor_next_index_by_hw_if_index;
/* ip6 lookup table config parameters */
u32 lookup_table_nbuckets;
uword lookup_table_size;
/* Seed for Jenkins hash used to compute ip6 flow hash. */
u32 flow_hash_seed;
struct {
/* TTL to use for host generated packets. */
u8 ttl;
u8 pad[3];
} host_config;
} ip6_main_t;
/* Global ip6 main structure. */
extern ip6_main_t ip6_main;
/* Global ip6 input node. Errors get attached to ip6 input node. */
extern vlib_node_registration_t ip6_input_node;
extern vlib_node_registration_t ip6_rewrite_node;
extern vlib_node_registration_t ip6_discover_neighbor_node;
extern vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node;
/* ipv6 neighbor discovery - timer/event types */
typedef enum {
ICMP6_ND_EVENT_INIT,
} ip6_icmp_neighbor_discovery_event_type_t;
typedef union {
u32 add_del_swindex;
struct {
u32 up_down_swindex;
u32 fib_index;
} up_down_event;
} ip6_icmp_neighbor_discovery_event_data_t;
u32 ip6_fib_lookup (ip6_main_t * im, u32 sw_if_index, ip6_address_t * dst);
u32 ip6_fib_lookup_with_table (ip6_main_t * im, u32 fib_index,
ip6_address_t * dst);
ip6_fib_t * find_ip6_fib_by_table_index_or_id (ip6_main_t * im,
u32 table_index_or_id,
u32 flags);
always_inline uword
ip6_destination_matches_route (ip6_main_t * im,
ip6_address_t * key,
ip6_address_t * dest,
uword dest_length)
{
int i;
for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
{
if ((key->as_uword[i] ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
return 0;
}
return 1;
}
always_inline uword
ip6_destination_matches_interface (ip6_main_t * im,
ip6_address_t * key,
ip_interface_address_t * ia)
{
ip6_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
return ip6_destination_matches_route (im, key, a, ia->address_length);
}
/* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
always_inline uword
ip6_unaligned_destination_matches_route (ip6_main_t * im,
ip6_address_t * key,
ip6_address_t * dest,
uword dest_length)
{
int i;
for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
{
if ((clib_mem_unaligned (&key->as_uword[i], uword) ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
return 0;
}
return 1;
}
always_inline void
ip6_src_address_for_packet (ip6_main_t * im, vlib_buffer_t * p, ip6_address_t * src, u32 sw_if_index)
{
ip_lookup_main_t * lm = &im->lookup_main;
ip_interface_address_t * ia = ip_interface_address_for_packet (lm, p, sw_if_index);
ip6_address_t * a = ip_interface_address_get_address (lm, ia);
*src = a[0];
}
always_inline u32
ip6_src_lookup_for_packet (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
{
if (vnet_buffer (b)->ip.adj_index[VLIB_RX] == ~0)
vnet_buffer (b)->ip.adj_index[VLIB_RX]
= ip6_fib_lookup (im, vnet_buffer (b)->sw_if_index[VLIB_RX],
&i->src_address);
return vnet_buffer (b)->ip.adj_index[VLIB_RX];
}
/* Find interface address which matches destination. */
always_inline ip6_address_t *
ip6_interface_address_matching_destination (ip6_main_t * im, ip6_address_t * dst, u32 sw_if_index,
ip_interface_address_t ** result_ia)
{
ip_lookup_main_t * lm = &im->lookup_main;
ip_interface_address_t * ia;
ip6_address_t * result = 0;
foreach_ip_interface_address (lm, ia, sw_if_index,
1 /* honor unnumbered */,
({
ip6_address_t * a = ip_interface_address_get_address (lm, ia);
if (ip6_destination_matches_route (im, dst, a, ia->address_length))
{
result = a;
break;
}
}));
if (result_ia)
*result_ia = result ? ia : 0;
return result;
}
clib_error_t *
ip6_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
ip6_address_t * address, u32 address_length,
u32 is_del);
int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);
/* Add/del a route to the FIB. */
#define IP6_ROUTE_FLAG_ADD (0 << 0)
#define IP6_ROUTE_FLAG_DEL (1 << 0)
#define IP6_ROUTE_FLAG_TABLE_ID (0 << 1)
#define IP6_ROUTE_FLAG_FIB_INDEX (1 << 1)
#define IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY (1 << 2)
#define IP6_ROUTE_FLAG_NO_REDISTRIBUTE (1 << 3)
#define IP6_ROUTE_FLAG_NOT_LAST_IN_GROUP (1 << 4)
/* Dynamic route created via neighbor discovery. */
#define IP6_ROUTE_FLAG_NEIGHBOR (1 << 5)
typedef struct {
/* IP6_ROUTE_FLAG_* */
u32 flags;
/* Either index of fib or table_id to hash and get fib.
IP6_ROUTE_FLAG_FIB_INDEX specifies index; otherwise table_id is assumed. */
u32 table_index_or_table_id;
/* Destination address (prefix) and length. */
ip6_address_t dst_address;
u32 dst_address_length;
/* Adjacency to use for this destination. */
u32 adj_index;
/* If specified adjacencies to add and then
use for this destination. add_adj/n_add_adj
are override adj_index if specified. */
ip_adjacency_t * add_adj;
u32 n_add_adj;
} ip6_add_del_route_args_t;
void ip6_add_del_route (ip6_main_t * im, ip6_add_del_route_args_t * args);
void ip6_add_del_route_next_hop (ip6_main_t * im,
u32 flags,
ip6_address_t * dst_address,
u32 dst_address_length,
ip6_address_t * next_hop,
u32 next_hop_sw_if_index,
u32 next_hop_weight, u32 adj_index,
u32 explicit_fib_index);
u32
ip6_get_route (ip6_main_t * im,
u32 fib_index_or_table_id,
u32 flags,
ip6_address_t * address,
u32 address_length);
void
ip6_foreach_matching_route (ip6_main_t * im,
u32 table_index_or_table_id,
u32 flags,
ip6_address_t * address,
u32 address_length,
ip6_address_t ** results,
u8 ** result_length);
void ip6_delete_matching_routes (ip6_main_t * im,
u32 table_index_or_table_id,
u32 flags,
ip6_address_t * address,
u32 address_length);
void ip6_maybe_remap_adjacencies (ip6_main_t * im,
u32 table_index_or_table_id,
u32 flags);
void ip6_adjacency_set_interface_route (vnet_main_t * vnm,
ip_adjacency_t * adj,
u32 sw_if_index,
u32 if_address_index);
clib_error_t *
ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index);
clib_error_t *
ip6_set_neighbor_limit (u32 neighbor_limit);
uword
ip6_udp_register_listener (vlib_main_t * vm,
u16 dst_port,
u32 next_node_index);
u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp);
void ip6_register_protocol (u32 protocol, u32 node_index);
serialize_function_t serialize_vnet_ip6_main, unserialize_vnet_ip6_main;
int
vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
u32 sw_if_index,
ip6_address_t * a,
u8 * link_layer_address,
uword n_bytes_link_layer_address);
int
vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
u32 sw_if_index,
ip6_address_t * a,
u8 * link_layer_address,
uword n_bytes_link_layer_address);
void
vnet_ip6_fib_init (ip6_main_t * im, u32 fib_index);
void
ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
u8 *mac);
void
ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
ip6_address_t *ip);
int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config);
int
ip6_neighbor_ra_config(vlib_main_t * vm, u32 sw_if_index,
u8 surpress, u8 managed, u8 other,
u8 ll_option, u8 send_unicast, u8 cease,
u8 use_lifetime, u32 lifetime,
u32 initial_count, u32 initial_interval,
u32 max_interval, u32 min_interval,
u8 is_no);
int
ip6_neighbor_ra_prefix(vlib_main_t * vm, u32 sw_if_index,
ip6_address_t *prefix_addr, u8 prefix_len,
u8 use_default, u32 val_lifetime, u32 pref_lifetime,
u8 no_advertise, u8 off_link, u8 no_autoconfig, u8 no_onlink,
u8 is_no);
clib_error_t *
enable_ip6_interface(vlib_main_t * vm,
u32 sw_if_index);
clib_error_t *
disable_ip6_interface(vlib_main_t * vm,
u32 sw_if_index);
int
ip6_interface_enabled(vlib_main_t * vm,
u32 sw_if_index);
clib_error_t *
set_ip6_link_local_address(vlib_main_t * vm,
u32 sw_if_index,
ip6_address_t *address,
u8 address_length);
void vnet_register_ip6_neighbor_resolution_event(vnet_main_t * vnm,
void * address_arg,
uword node_index,
uword type_opaque,
uword data);
int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
u32 table_index);
extern vlib_node_registration_t ip6_lookup_node;
/* Compute flow hash. We'll use it to select which Sponge to use for this
flow. And other things. */
always_inline u32
ip6_compute_flow_hash (ip6_header_t * ip, u32 flow_hash_config)
{
tcp_header_t * tcp = (void *) (ip + 1);
u64 a, b, c;
u64 t1, t2;
uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
|| ip->protocol == IP_PROTOCOL_UDP);
t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;
a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
t1 = is_tcp_udp ? tcp->ports.src : 0;
t2 = is_tcp_udp ? tcp->ports.dst : 0;
t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
((t1<<16) | t2) : ((t2<<16) | t1);
hash_mix64 (a, b, c);
return (u32) c;
}
#endif /* included_ip_ip6_h */
|