aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/pppoe/pppoe_encap.c
blob: 69bec61dec1411c4f7458b3ac0844cad66a3aade (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
/*
 * Copyright (c) 2017 Intel 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 <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <pppoe/pppoe.h>

/* Statistics (not all errors) */
#define foreach_pppoe_encap_error    \
_(ENCAPSULATED, "good packets encapsulated")

static char * pppoe_encap_error_strings[] = {
#define _(sym,string) string,
  foreach_pppoe_encap_error
#undef _
};

typedef enum {
#define _(sym,str) PPPOE_ENCAP_ERROR_##sym,
    foreach_pppoe_encap_error
#undef _
    PPPOE_ENCAP_N_ERROR,
} pppoe_encap_error_t;

#define foreach_pppoe_encap_next       \
_(DROP, "error-drop")                  \
_(INTERFACE, "interface-output" )      \

typedef enum
{
#define _(s,n) PPPOE_ENCAP_NEXT_##s,
  foreach_pppoe_encap_next
#undef _
    PPPOE_ENCAP_N_NEXT,
} pppoe_encap_next_t;

typedef struct {
  u32 session_index;
  u32 session_id;
} pppoe_encap_trace_t;

u8 * format_pppoe_encap_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 *);
  pppoe_encap_trace_t * t
      = va_arg (*args, pppoe_encap_trace_t *);

  s = format (s, "PPPOE encap to pppoe_session%d session_id %d",
	      t->session_index, t->session_id);
  return s;
}


#define foreach_fixed_header2_offset            \
        _(0) _(1)


static uword
pppoe_encap (vlib_main_t * vm,
	      vlib_node_runtime_t * node,
	      vlib_frame_t * from_frame)
{
  u32 n_left_from, next_index, * from, * to_next;
  pppoe_main_t * pem = &pppoe_main;
  vnet_main_t * vnm = pem->vnet_main;
  vnet_interface_main_t * im = &vnm->interface_main;
  u32 pkts_encapsulated = 0;
  u32 thread_index = vlib_get_thread_index();
  u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
  u32 sw_if_index0 = 0, sw_if_index1 = 0;
  u32 next0 = 0, next1 = 0;
  pppoe_session_t * t0 = NULL, * t1 = NULL;

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

  next_index = node->cached_next_index;
  stats_sw_if_index = node->runtime_data[0];
  stats_n_packets = stats_n_bytes = 0;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index,
			   to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
	{
          u32 bi0, bi1;
	  vlib_buffer_t * b0, * b1;
	  u32 len0, len1;
	  ethernet_header_t * eth0, * eth1;
          pppoe_header_t * pppoe0, * pppoe1;
          u64 * copy_src0, * copy_dst0;
          u64 * copy_src1, * copy_dst1;
          u16 * copy_src_last0, * copy_dst_last0;
          u16 * copy_src_last1, * copy_dst_last1;
          u16 new_l0, new_l1;
          u32 session_id0, session_id1;

	  /* Prefetch next iteration. */
	  {
	    vlib_buffer_t * p2, * p3;

	    p2 = vlib_get_buffer (vm, from[2]);
	    p3 = vlib_get_buffer (vm, from[3]);

	    vlib_prefetch_buffer_header (p2, LOAD);
	    vlib_prefetch_buffer_header (p3, LOAD);

	    CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
	    CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
	  }

	  bi0 = from[0];
	  bi1 = from[1];
	  to_next[0] = bi0;
	  to_next[1] = bi1;
	  from += 2;
	  to_next += 2;
	  n_left_to_next -= 2;
	  n_left_from -= 2;

	  b0 = vlib_get_buffer (vm, bi0);
	  b1 = vlib_get_buffer (vm, bi1);

	  /* Get next node index and if-index from session */
	  sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
	  session_id0 = pem->session_index_by_sw_if_index[sw_if_index0];
	  t0 = pool_elt_at_index(pem->sessions, session_id0);
	  next0 = PPPOE_ENCAP_NEXT_INTERFACE;
          vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_if_index;

          /* Get next node index and if-index from session */
	  sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
	  session_id1 = pem->session_index_by_sw_if_index[sw_if_index1];
	  t1 = pool_elt_at_index(pem->sessions, session_id1);
	  next1 = PPPOE_ENCAP_NEXT_INTERFACE;
          vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_if_index;

          /* Apply the rewrite string. $$$$ vnet_rewrite? */
          vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
          vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));

          eth0 = (ethernet_header_t *)(vlib_buffer_get_current(b0));
          eth1 = (ethernet_header_t *)(vlib_buffer_get_current(b1));

	  /* Copy the fixed header */
	  copy_dst0 = (u64 *) eth0;
	  copy_src0 = (u64 *) t0->rewrite;
	  copy_dst1 = (u64 *) eth1;
	  copy_src1 = (u64 *) t1->rewrite;
	  /* Copy first 8-bytes at a time */
#define _(offs) copy_dst0[offs] = copy_src0[offs];
	  foreach_fixed_header2_offset;
#undef _
	  /* Last 6 octets. Hopefully gcc will be our friend */
          copy_dst_last0 = (u16 *)(&copy_dst0[2]);
          copy_src_last0 = (u16 *)(&copy_src0[2]);
          copy_dst_last0[0] = copy_src_last0[0];
          copy_dst_last0[1] = copy_src_last0[1];
          copy_dst_last0[2] = copy_src_last0[2];

#define _(offs) copy_dst1[offs] = copy_src1[offs];
	  foreach_fixed_header2_offset;
#undef _
	  /* Last 6 octets. Hopefully gcc will be our friend */
          copy_dst_last1 = (u16 *)(&copy_dst1[2]);
          copy_src_last1 = (u16 *)(&copy_src1[2]);
          copy_dst_last1[0] = copy_src_last1[0];
          copy_dst_last1[1] = copy_src_last1[1];
          copy_dst_last1[2] = copy_src_last1[2];

          /* Fix PPPoE length */
	  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
					 - sizeof (*pppoe0) - sizeof(*eth0));
	  pppoe0 = (pppoe_header_t *)(eth0 + 1);
	  pppoe0->length = new_l0;

	  new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
					 - sizeof (*pppoe1) - sizeof(*eth1));
	  pppoe1 = (pppoe_header_t *)(eth1 + 1);
	  pppoe1->length = new_l1;

          pkts_encapsulated += 2;
 	  len0 = vlib_buffer_length_in_chain (vm, b0);
 	  len1 = vlib_buffer_length_in_chain (vm, b1);
	  stats_n_packets += 2;
	  stats_n_bytes += len0 + len1;

	  /* Batch stats increment on the same pppoe session so counter is not
	     incremented per packet. Note stats are still incremented for deleted
	     and admin-down session where packets are dropped. It is not worthwhile
	     to check for this rare case and affect normal path performance. */
	  if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
			     (sw_if_index1 != stats_sw_if_index)))
	    {
	      stats_n_packets -= 2;
	      stats_n_bytes -= len0 + len1;
	      if (sw_if_index0 == sw_if_index1)
	        {
		  if (stats_n_packets)
		    vlib_increment_combined_counter
		      (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
		       thread_index, stats_sw_if_index,
		       stats_n_packets, stats_n_bytes);
		  stats_sw_if_index = sw_if_index0;
		  stats_n_packets = 2;
		  stats_n_bytes = len0 + len1;
	        }
	      else
	        {
		  vlib_increment_combined_counter
		      (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
		       thread_index, sw_if_index0, 1, len0);
		  vlib_increment_combined_counter
		      (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
		       thread_index, sw_if_index1, 1, len1);
		}
	    }

	  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
            {
              pppoe_encap_trace_t *tr =
                vlib_add_trace (vm, node, b0, sizeof (*tr));
              tr->session_index = t0 - pem->sessions;
              tr->session_id = t0->session_id;
           }

          if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
            {
              pppoe_encap_trace_t *tr =
                vlib_add_trace (vm, node, b1, sizeof (*tr));
              tr->session_index = t1 - pem->sessions;
              tr->session_id = t1->session_id;
            }

	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, bi1, next0, next1);
	}

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t * b0;
	  ethernet_header_t * eth0;
          pppoe_header_t * pppoe0;
          u64 * copy_src0, * copy_dst0;
          u16 * copy_src_last0, * copy_dst_last0;
          u16 new_l0;
          u32 len0;
          u32 session_id0;

	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);

	  /* Get next node index and if-index from session */
	  sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
	  session_id0 = pem->session_index_by_sw_if_index[sw_if_index0];
	  t0 = pool_elt_at_index(pem->sessions, session_id0);
	  next0 = PPPOE_ENCAP_NEXT_INTERFACE;
          vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_if_index;

          /* Apply the rewrite string. $$$$ vnet_rewrite? */
          vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));

          eth0 = (ethernet_header_t *)(vlib_buffer_get_current(b0));
	  /* Copy the fixed header */
	  copy_dst0 = (u64 *) eth0;
	  copy_src0 = (u64 *) t0->rewrite;

	  /* Copy first 8-bytes at a time */
#define _(offs) copy_dst0[offs] = copy_src0[offs];
	  foreach_fixed_header2_offset;
#undef _
	  /* Last 6 octets. Hopefully gcc will be our friend */
          copy_dst_last0 = (u16 *)(&copy_dst0[2]);
          copy_src_last0 = (u16 *)(&copy_src0[2]);
          copy_dst_last0[0] = copy_src_last0[0];
          copy_dst_last0[1] = copy_src_last0[1];
          copy_dst_last0[2] = copy_src_last0[2];

          /* Fix PPPoE length */
	  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
					 - sizeof (*pppoe0) - sizeof(*eth0));
	  pppoe0 = (pppoe_header_t *)(eth0 + 1);
	  pppoe0->length = new_l0;

          pkts_encapsulated ++;
	  len0 = vlib_buffer_length_in_chain (vm, b0);
	  stats_n_packets += 1;
	  stats_n_bytes += len0;

	  /* Batch stats increment on the same pppoe session so counter is not
	     incremented per packet. Note stats are still incremented for deleted
	     and admin-down session where packets are dropped. It is not worthwhile
	     to check for this rare case and affect normal path performance. */
	  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
	    {
	      stats_n_packets -= 1;
	      stats_n_bytes -= len0;
	      if (stats_n_packets)
		vlib_increment_combined_counter
		  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
		   thread_index, stats_sw_if_index,
		   stats_n_packets, stats_n_bytes);
	      stats_n_packets = 1;
	      stats_n_bytes = len0;
	      stats_sw_if_index = sw_if_index0;
	    }

          if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
            {
              pppoe_encap_trace_t *tr =
                vlib_add_trace (vm, node, b0, sizeof (*tr));
              tr->session_index = t0 - pem->sessions;
              tr->session_id = t0->session_id;
            }
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  /* Do we still need this now that session tx stats is kept? */
  vlib_node_increment_counter (vm, node->node_index,
                               PPPOE_ENCAP_ERROR_ENCAPSULATED,
                               pkts_encapsulated);

  /* Increment any remaining batch stats */
  if (stats_n_packets)
    {
      vlib_increment_combined_counter
	(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	 thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
      node->runtime_data[0] = stats_sw_if_index;
    }

  return from_frame->n_vectors;
}

VLIB_REGISTER_NODE (pppoe_encap_node) = {
  .function = pppoe_encap,
  .name = "pppoe-encap",
  .vector_size = sizeof (u32),
  .format_trace = format_pppoe_encap_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN(pppoe_encap_error_strings),
  .error_strings = pppoe_encap_error_strings,
  .n_next_nodes = PPPOE_ENCAP_N_NEXT,
  .next_nodes = {
#define _(s,n) [PPPOE_ENCAP_NEXT_##s] = n,
    foreach_pppoe_encap_next
#undef _
  },
};

VLIB_NODE_FUNCTION_MULTIARCH (pppoe_encap_node, pppoe_encap)