aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/ct6/ct6_in2out.c
blob: 4f2ebae60cfcf2a4b871b3ed121f537ebb6c9f59 (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
/*
 * ct6_in2out.c - ip6 connection tracker, inside-to-outside path
 *
 * Copyright (c) 2019 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vppinfra/error.h>
#include <ct6/ct6.h>

typedef struct
{
  u32 sw_if_index;
  u32 next_index;
  u32 session_index;
} ct6_in2out_trace_t;

#ifndef CLIB_MARCH_VARIANT

/* packet trace format function */
static u8 *
format_ct6_in2out_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  ct6_in2out_trace_t *t = va_arg (*args, ct6_in2out_trace_t *);

  s = format (s, "CT6_IN2OUT: sw_if_index %d, next index %d session %d\n",
	      t->sw_if_index, t->next_index, t->session_index);
  return s;
}

vlib_node_registration_t ct6_in2out_node;

#endif /* CLIB_MARCH_VARIANT */

#define foreach_ct6_in2out_error                \
_(PROCESSED, "ct6 packets processed")           \
_(CREATED, "ct6 sessions created")              \
_(RECYCLED, "ct6 sessions recycled")

typedef enum
{
#define _(sym,str) CT6_IN2OUT_ERROR_##sym,
  foreach_ct6_in2out_error
#undef _
    CT6_IN2OUT_N_ERROR,
} ct6_in2out_error_t;

#ifndef CLIB_MARCH_VARIANT
static char *ct6_in2out_error_strings[] = {
#define _(sym,string) string,
  foreach_ct6_in2out_error
#undef _
};
#endif /* CLIB_MARCH_VARIANT */

typedef enum
{
  CT6_IN2OUT_NEXT_DROP,
  CT6_IN2OUT_N_NEXT,
} ct6_next_t;

#ifndef CLIB_MARCH_VARIANT
ct6_session_t *
ct6_create_or_recycle_session (ct6_main_t * cmp,
			       clib_bihash_kv_48_8_t * kvpp, f64 now,
			       u32 my_thread_index, u32 * recyclep,
			       u32 * createp)
{
  ct6_session_t *s0;

  /* Empty arena? */
  if (PREDICT_FALSE (cmp->last_index[my_thread_index] == ~0))
    goto alloc0;

  /* Look at the least-recently-used session */
  s0 = pool_elt_at_index (cmp->sessions[my_thread_index],
			  cmp->last_index[my_thread_index]);

  if (s0->expires < now)
    clib_warning ("session %d expired %.2f time now %.2f",
		  s0 - cmp->sessions[my_thread_index], s0->expires, now);

  if (pool_elts (cmp->sessions[my_thread_index]) >=
      cmp->max_sessions_per_worker)
    clib_warning ("recycle session %d have %d max %d",
		  s0 - cmp->sessions[my_thread_index],
		  pool_elts (cmp->sessions[my_thread_index]),
		  cmp->max_sessions_per_worker);

  /* Session expired, or we have as many sessions as is allowed by law? */
  if ((s0->expires < now) || (pool_elts (cmp->sessions[my_thread_index])
			      >= cmp->max_sessions_per_worker))
    {
      /* recycle the session */
      if (clib_bihash_add_del_48_8 (&cmp->session_hash,
				    (clib_bihash_kv_48_8_t *) s0,
				    0 /* is_add */ ) < 0)
	clib_warning ("session %d not found in hash?",
		      s0 - cmp->sessions[my_thread_index]);

      ct6_lru_remove (cmp, s0);
      *recyclep += 1;
    }
  else
    {
    alloc0:
      /* Allocate a fresh session */
      pool_get (cmp->sessions[my_thread_index], s0);
      *createp += 1;
    }

  /* Sesison setup */
  memset (s0, 0, sizeof (*s0));
  clib_memcpy_fast (s0, kvpp, sizeof (ct6_session_key_t));
  s0->thread_index = my_thread_index;
  s0->expires = now + cmp->session_timeout_interval;
  kvpp->value = s0 - cmp->sessions[my_thread_index];
  clib_bihash_add_del_48_8 (&cmp->session_hash, kvpp, 1 /* is_add */ );
  ct6_lru_add (cmp, s0, now);
  return s0;
}
#endif /* CLIB_MARCH_VARIANT */

always_inline uword
ct6_in2out_inline (vlib_main_t * vm,
		   vlib_node_runtime_t * node, vlib_frame_t * frame,
		   int is_trace)
{
  u32 n_left_from, *from;
  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
  u16 nexts[VLIB_FRAME_SIZE], *next;
  ct6_main_t *cmp = &ct6_main;
  u32 my_thread_index = vm->thread_index;
  f64 now = vlib_time_now (vm);
  u32 created = 0;
  u32 recycled = 0;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;

  vlib_get_buffers (vm, from, bufs, n_left_from);
  b = bufs;
  next = nexts;

#if 0
  while (n_left_from >= 4)
    {
      /* Prefetch next iteration. */
      if (PREDICT_TRUE (n_left_from >= 8))
	{
	  vlib_prefetch_buffer_header (b[4], STORE);
	  vlib_prefetch_buffer_header (b[5], STORE);
	  vlib_prefetch_buffer_header (b[6], STORE);
	  vlib_prefetch_buffer_header (b[7], STORE);
	  CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, STORE);
	  CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, STORE);
	  CLIB_PREFETCH (b[6]->data, CLIB_CACHE_LINE_BYTES, STORE);
	  CLIB_PREFETCH (b[7]->data, CLIB_CACHE_LINE_BYTES, STORE);
	}

      /* $$$$ process 4x pkts right here */
      next[0] = 0;
      next[1] = 0;
      next[2] = 0;
      next[3] = 0;

      if (is_trace)
	{
	  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
	    {
	      ct6_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
	      t->next_index = next[0];
	      t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
	    }
	  if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
	    {
	      ct6_trace_t *t = vlib_add_trace (vm, node, b[1], sizeof (*t));
	      t->next_index = next[1];
	      t->sw_if_index = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
	    }
	  if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
	    {
	      ct6_trace_t *t = vlib_add_trace (vm, node, b[2], sizeof (*t));
	      t->next_index = next[2];
	      t->sw_if_index = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
	    }
	  if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
	    {
	      ct6_trace_t *t = vlib_add_trace (vm, node, b[3], sizeof (*t));
	      t->next_index = next[3];
	      t->sw_if_index = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
	    }
	}

      b += 4;
      next += 4;
      n_left_from -= 4;
    }
#endif

  while (n_left_from > 0)
    {
      clib_bihash_kv_48_8_t kvp0;
      ct6_session_key_t *key0;
      ct6_session_t *s0;
      u32 session_index0 = ~0;
      u32 next0, delta0;
      ethernet_header_t *e0;

      ip6_header_t *ip0;
      udp_header_t *udp0;

      /* $$$ Set to 0 for pg testing */
      if (1)
	{
	  vnet_feature_next (&next0, b[0]);
	  next[0] = next0;
	}
      else
	next[0] = CT6_IN2OUT_NEXT_DROP;

      /*
       * This is an output feature which runs at the last possible
       * moment. Assume an ethernet header. Make sure the packet is
       * actually ipv6 before we do anything else.
       *
       * Unfortunately, we have to re-parse the L2 header.
       */

      e0 = vlib_buffer_get_current (b[0]);
      delta0 = sizeof (*e0);
      delta0 += (e0->type == clib_net_to_host_u16 (ETHERNET_TYPE_VLAN))
	? 4 : 0;
      delta0 += (e0->type == clib_net_to_host_u16 (ETHERNET_TYPE_DOT1AD))
	? 8 : 0;

      if (PREDICT_TRUE (delta0 == sizeof (*e0)))
	{
	  if (e0->type != clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
	    goto trace0;
	}
      else
	{
	  u16 *tagged_etype_ptr = vlib_buffer_get_current (b[0]) + delta0 - 2;
	  if (*tagged_etype_ptr != clib_host_to_net_u16 (ETHERNET_TYPE_IP6))
	    goto trace0;
	}

      ip0 = (ip6_header_t *) (vlib_buffer_get_current (b[0]) + delta0);

      /*
       * Pass non-global unicast traffic
       */
      if (PREDICT_FALSE (!ip6_address_is_global_unicast (&ip0->src_address)
			 ||
			 !ip6_address_is_global_unicast (&ip0->src_address)))
	goto trace0;
      /* Pass non-udp, non-tcp traffic */
      if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_TCP &&
			 ip0->protocol != IP_PROTOCOL_UDP))
	goto trace0;

      udp0 = ip6_next_header (ip0);

      /*
       * See if we know about this flow.
       * Key set up for the out2in path, the performant case
       */
      key0 = (ct6_session_key_t *) & kvp0;
      clib_memcpy_fast (&key0->src, &ip0->dst_address,
			sizeof (ip6_address_t));
      clib_memcpy_fast (&key0->dst, &ip0->src_address,
			sizeof (ip6_address_t));
      key0->as_u64[4] = 0;
      key0->as_u64[5] = 0;
      key0->sport = udp0->dst_port;
      key0->dport = udp0->src_port;
      key0->proto = ip0->protocol;

      /* Need to create a new session? */
      if (clib_bihash_search_48_8 (&cmp->session_hash, &kvp0, &kvp0) < 0)
	{
	  s0 =
	    ct6_create_or_recycle_session (cmp, &kvp0, now, my_thread_index,
					   &recycled, &created);
	  session_index0 = kvp0.value;
	}
      else
	{
	  s0 = pool_elt_at_index (cmp->sessions[my_thread_index], kvp0.value);
	  session_index0 = kvp0.value;
	  ct6_update_session_hit (cmp, s0, now);
	}

    trace0:
      if (is_trace)
	{
	  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
	    {
	      ct6_in2out_trace_t *t =
		vlib_add_trace (vm, node, b[0], sizeof (*t));
	      t->next_index = next[0];
	      t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
	      t->session_index = session_index0;
	    }
	}

      b += 1;
      next += 1;
      n_left_from -= 1;
    }

  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);

  vlib_node_increment_counter (vm, node->node_index,
			       CT6_IN2OUT_ERROR_PROCESSED, frame->n_vectors);
  vlib_node_increment_counter (vm, node->node_index,
			       CT6_IN2OUT_ERROR_CREATED, created);
  vlib_node_increment_counter (vm, node->node_index,
			       CT6_IN2OUT_ERROR_RECYCLED, recycled);

  return frame->n_vectors;
}

VLIB_NODE_FN (ct6_in2out_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
				vlib_frame_t * frame)
{
  if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
    return ct6_in2out_inline (vm, node, frame, 1 /* is_trace */ );
  else
    return ct6_in2out_inline (vm, node, frame, 0 /* is_trace */ );
}

/* *INDENT-OFF* */
#ifndef CLIB_MARCH_VARIANT
VLIB_REGISTER_NODE (ct6_in2out_node) =
{
  .name = "ct6-in2out",
  .vector_size = sizeof (u32),
  .format_trace = format_ct6_in2out_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(ct6_in2out_error_strings),
  .error_strings = ct6_in2out_error_strings,

  .n_next_nodes = CT6_IN2OUT_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
        [CT6_IN2OUT_NEXT_DROP] = "error-drop",
  },
  .unformat_buffer = unformat_ethernet_header,
};
#endif /* CLIB_MARCH_VARIANT */
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */