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Vector Packet Processing
pppoe_decap.c
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1 /*
2  * decap.c: pppoe session decap packet processing
3  *
4  * Copyright (c) 2017 Intel and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/ppp/packet.h>
21 #include <pppoe/pppoe.h>
22 
23 typedef struct {
29 
30 static u8 * format_pppoe_rx_trace (u8 * s, va_list * args)
31 {
32  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
33  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
34  pppoe_rx_trace_t * t = va_arg (*args, pppoe_rx_trace_t *);
35 
36  if (t->session_index != ~0)
37  {
38  s = format (s, "PPPoE decap from pppoe_session%d session_id %d next %d error %d",
39  t->session_index, t->session_id, t->next_index, t->error);
40  }
41  else
42  {
43  s = format (s, "PPPoE decap error - session for session_id %d does not exist",
44  t->session_id);
45  }
46  return s;
47 }
48 
50  vlib_node_runtime_t * node,
51  vlib_frame_t * from_frame)
52 {
53  u32 n_left_from, next_index, * from, * to_next;
54  pppoe_main_t * pem = &pppoe_main;
55  vnet_main_t * vnm = pem->vnet_main;
57  u32 pkts_decapsulated = 0;
58  u32 thread_index = vlib_get_thread_index();
59  u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
60  pppoe_entry_key_t cached_key;
61  pppoe_entry_result_t cached_result;
62 
63  from = vlib_frame_vector_args (from_frame);
64  n_left_from = from_frame->n_vectors;
65 
66  /* Clear the one-entry cache in case session table was updated */
67  cached_key.raw = ~0;
68  cached_result.raw = ~0; /* warning be gone */
69 
70  next_index = node->cached_next_index;
71  stats_sw_if_index = node->runtime_data[0];
72  stats_n_packets = stats_n_bytes = 0;
73 
74  while (n_left_from > 0)
75  {
76  u32 n_left_to_next;
77 
78  vlib_get_next_frame (vm, node, next_index,
79  to_next, n_left_to_next);
80  while (n_left_from >= 4 && n_left_to_next >= 2)
81  {
82  u32 bi0, bi1;
83  vlib_buffer_t * b0, * b1;
84  u32 next0, next1;
85  ethernet_header_t *h0, *h1;
86  pppoe_header_t * pppoe0, * pppoe1;
87  u16 ppp_proto0 = 0, ppp_proto1 = 0;
88  pppoe_session_t * t0, * t1;
89  u32 error0, error1;
90  u32 sw_if_index0, sw_if_index1, len0, len1;
91  pppoe_entry_key_t key0, key1;
92  pppoe_entry_result_t result0, result1;
93  u32 bucket0, bucket1;
94 
95  /* Prefetch next iteration. */
96  {
97  vlib_buffer_t * p2, * p3;
98 
99  p2 = vlib_get_buffer (vm, from[2]);
100  p3 = vlib_get_buffer (vm, from[3]);
101 
102  vlib_prefetch_buffer_header (p2, LOAD);
103  vlib_prefetch_buffer_header (p3, LOAD);
104 
107  }
108 
109  bi0 = from[0];
110  bi1 = from[1];
111  to_next[0] = bi0;
112  to_next[1] = bi1;
113  from += 2;
114  to_next += 2;
115  n_left_to_next -= 2;
116  n_left_from -= 2;
117 
118  b0 = vlib_get_buffer (vm, bi0);
119  b1 = vlib_get_buffer (vm, bi1);
120  error0 = 0;
121  error1 = 0;
122 
123  /* leaves current_data pointing at the pppoe header */
124  pppoe0 = vlib_buffer_get_current (b0);
125  pppoe1 = vlib_buffer_get_current (b1);
126  ppp_proto0 = clib_net_to_host_u16(pppoe0->ppp_proto);
127  ppp_proto1 = clib_net_to_host_u16(pppoe1->ppp_proto);
128 
129  /* Manipulate packet 0 */
130  if ((ppp_proto0 != PPP_PROTOCOL_ip4)
131  && (ppp_proto0 != PPP_PROTOCOL_ip6))
132  {
133  error0 = PPPOE_ERROR_CONTROL_PLANE;
134  next0 = PPPOE_INPUT_NEXT_CP_INPUT;
135  goto trace0;
136  }
137 
138  /* get client mac */
139  vlib_buffer_reset(b0);
140  h0 = vlib_buffer_get_current (b0);
141 
142  pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
143  h0->src_address, pppoe0->session_id,
144  &key0, &bucket0, &result0);
145  if (PREDICT_FALSE (result0.fields.session_index == ~0))
146  {
147  error0 = PPPOE_ERROR_NO_SUCH_SESSION;
148  next0 = PPPOE_INPUT_NEXT_DROP;
149  goto trace0;
150  }
151 
152  t0 = pool_elt_at_index (pem->sessions,
153  result0.fields.session_index);
154 
155  /* Pop Eth and PPPoE header */
156  vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0));
157 
158  next0 = (ppp_proto0==PPP_PROTOCOL_ip4)?
159  PPPOE_INPUT_NEXT_IP4_INPUT
160  : PPPOE_INPUT_NEXT_IP6_INPUT;
161 
162  sw_if_index0 = t0->sw_if_index;
163  len0 = vlib_buffer_length_in_chain (vm, b0);
164 
165  pkts_decapsulated ++;
166  stats_n_packets += 1;
167  stats_n_bytes += len0;
168 
169  /* Batch stats increment on the same pppoe session so counter
170  is not incremented per packet */
171  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
172  {
173  stats_n_packets -= 1;
174  stats_n_bytes -= len0;
175  if (stats_n_packets)
178  thread_index, stats_sw_if_index,
179  stats_n_packets, stats_n_bytes);
180  stats_n_packets = 1;
181  stats_n_bytes = len0;
182  stats_sw_if_index = sw_if_index0;
183  }
184 
185  trace0:
186  b0->error = error0 ? node->errors[error0] : 0;
187 
188  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
189  {
190  pppoe_rx_trace_t *tr
191  = vlib_add_trace (vm, node, b0, sizeof (*tr));
192  tr->next_index = next0;
193  tr->error = error0;
194  tr->session_index = result0.fields.session_index;
195  tr->session_id = clib_net_to_host_u32(pppoe0->session_id);
196  }
197 
198 
199  /* Manipulate packet 1 */
200  if ((ppp_proto1 != PPP_PROTOCOL_ip4)
201  && (ppp_proto1 != PPP_PROTOCOL_ip6))
202  {
203  error1 = PPPOE_ERROR_CONTROL_PLANE;
204  next1 = PPPOE_INPUT_NEXT_CP_INPUT;
205  goto trace1;
206  }
207 
208  /* get client mac */
209  vlib_buffer_reset(b1);
210  h1 = vlib_buffer_get_current (b1);
211 
212  pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
213  h1->src_address, pppoe1->session_id,
214  &key1, &bucket1, &result1);
215  if (PREDICT_FALSE (result1.fields.session_index == ~0))
216  {
217  error1 = PPPOE_ERROR_NO_SUCH_SESSION;
218  next1 = PPPOE_INPUT_NEXT_DROP;
219  goto trace1;
220  }
221 
222  t1 = pool_elt_at_index (pem->sessions,
223  result1.fields.session_index);
224 
225  /* Pop Eth and PPPoE header */
226  vlib_buffer_advance(b1, sizeof(*h1)+sizeof(*pppoe1));
227 
228  next1 = (ppp_proto1==PPP_PROTOCOL_ip4)?
229  PPPOE_INPUT_NEXT_IP4_INPUT
230  : PPPOE_INPUT_NEXT_IP6_INPUT;
231 
232  sw_if_index1 = t1->sw_if_index;
233  len1 = vlib_buffer_length_in_chain (vm, b1);
234 
235  pkts_decapsulated ++;
236  stats_n_packets += 1;
237  stats_n_bytes += len1;
238 
239  /* Batch stats increment on the same pppoe session so counter
240  is not incremented per packet */
241  if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
242  {
243  stats_n_packets -= 1;
244  stats_n_bytes -= len1;
245  if (stats_n_packets)
248  thread_index, stats_sw_if_index,
249  stats_n_packets, stats_n_bytes);
250  stats_n_packets = 1;
251  stats_n_bytes = len1;
252  stats_sw_if_index = sw_if_index1;
253  }
254 
255  trace1:
256  b1->error = error1 ? node->errors[error1] : 0;
257 
258  if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
259  {
260  pppoe_rx_trace_t *tr
261  = vlib_add_trace (vm, node, b1, sizeof (*tr));
262  tr->next_index = next1;
263  tr->error = error1;
264  tr->session_index = result1.fields.session_index;
265  tr->session_id = clib_net_to_host_u32(pppoe1->session_id);
266  }
267 
268  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
269  to_next, n_left_to_next,
270  bi0, bi1, next0, next1);
271  }
272 
273  while (n_left_from > 0 && n_left_to_next > 0)
274  {
275  u32 bi0;
276  vlib_buffer_t * b0;
277  u32 next0;
278  ethernet_header_t *h0;
279  pppoe_header_t * pppoe0;
280  u16 ppp_proto0 = 0;
281  pppoe_session_t * t0;
282  u32 error0;
283  u32 sw_if_index0, len0;
284  pppoe_entry_key_t key0;
285  pppoe_entry_result_t result0;
286  u32 bucket0;
287 
288  bi0 = from[0];
289  to_next[0] = bi0;
290  from += 1;
291  to_next += 1;
292  n_left_from -= 1;
293  n_left_to_next -= 1;
294 
295  b0 = vlib_get_buffer (vm, bi0);
296  error0 = 0;
297 
298  /* leaves current_data pointing at the pppoe header */
299  pppoe0 = vlib_buffer_get_current (b0);
300  ppp_proto0 = clib_net_to_host_u16(pppoe0->ppp_proto);
301 
302  if ((ppp_proto0 != PPP_PROTOCOL_ip4)
303  && (ppp_proto0 != PPP_PROTOCOL_ip6))
304  {
305  error0 = PPPOE_ERROR_CONTROL_PLANE;
306  next0 = PPPOE_INPUT_NEXT_CP_INPUT;
307  goto trace00;
308  }
309 
310  /* get client mac */
311  vlib_buffer_reset(b0);
312  h0 = vlib_buffer_get_current (b0);
313 
314  pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
315  h0->src_address, pppoe0->session_id,
316  &key0, &bucket0, &result0);
317  if (PREDICT_FALSE (result0.fields.session_index == ~0))
318  {
319  error0 = PPPOE_ERROR_NO_SUCH_SESSION;
320  next0 = PPPOE_INPUT_NEXT_DROP;
321  goto trace00;
322  }
323 
324  t0 = pool_elt_at_index (pem->sessions,
325  result0.fields.session_index);
326 
327  /* Pop Eth and PPPoE header */
328  vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0));
329 
330  next0 = (ppp_proto0==PPP_PROTOCOL_ip4)?
331  PPPOE_INPUT_NEXT_IP4_INPUT
332  : PPPOE_INPUT_NEXT_IP6_INPUT;
333 
334  sw_if_index0 = t0->sw_if_index;
335  len0 = vlib_buffer_length_in_chain (vm, b0);
336 
337  pkts_decapsulated ++;
338  stats_n_packets += 1;
339  stats_n_bytes += len0;
340 
341  /* Batch stats increment on the same pppoe session so counter
342  is not incremented per packet */
343  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
344  {
345  stats_n_packets -= 1;
346  stats_n_bytes -= len0;
347  if (stats_n_packets)
350  thread_index, stats_sw_if_index,
351  stats_n_packets, stats_n_bytes);
352  stats_n_packets = 1;
353  stats_n_bytes = len0;
354  stats_sw_if_index = sw_if_index0;
355  }
356 
357  trace00:
358  b0->error = error0 ? node->errors[error0] : 0;
359 
360  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
361  {
362  pppoe_rx_trace_t *tr
363  = vlib_add_trace (vm, node, b0, sizeof (*tr));
364  tr->next_index = next0;
365  tr->error = error0;
366  tr->session_index = result0.fields.session_index;
367  tr->session_id = clib_net_to_host_u16(pppoe0->session_id);
368  }
369  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
370  to_next, n_left_to_next,
371  bi0, next0);
372  }
373 
374  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
375  }
376  /* Do we still need this now that session tx stats is kept? */
378  PPPOE_ERROR_DECAPSULATED,
379  pkts_decapsulated);
380 
381  /* Increment any remaining batch stats */
382  if (stats_n_packets)
383  {
386  thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
387  node->runtime_data[0] = stats_sw_if_index;
388  }
389 
390  return from_frame->n_vectors;
391 }
392 
393 static char * pppoe_error_strings[] = {
394 #define pppoe_error(n,s) s,
395 #include <pppoe/pppoe_error.def>
396 #undef pppoe_error
397 #undef _
398 };
399 
401  .name = "pppoe-input",
402  /* Takes a vector of packets. */
403  .vector_size = sizeof (u32),
404 
405  .n_errors = PPPOE_N_ERROR,
406  .error_strings = pppoe_error_strings,
407 
408  .n_next_nodes = PPPOE_INPUT_N_NEXT,
409  .next_nodes = {
410 #define _(s,n) [PPPOE_INPUT_NEXT_##s] = n,
412 #undef _
413  },
414 
415  .format_trace = format_pppoe_rx_trace,
416 };
417 
418 
u16 ppp_proto
Definition: pppoe.h:43
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
Definition: pppoe.h:112
#define CLIB_UNUSED(x)
Definition: clib.h:82
static void vlib_buffer_reset(vlib_buffer_t *b)
Reset current header & length to state they were in when packet was received.
Definition: buffer.h:277
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:220
static u8 * format_pppoe_rx_trace(u8 *s, va_list *args)
Definition: pppoe_decap.c:30
vnet_interface_main_t interface_main
Definition: vnet.h:56
u64 raw
Definition: pppoe.h:146
u8 src_address[6]
Definition: packet.h:56
u8 data[0]
Packet data.
Definition: buffer.h:181
#define foreach_pppoe_input_next
Definition: pppoe.h:75
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
#define VLIB_NODE_FN(node)
Definition: node.h:201
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:366
unsigned char u8
Definition: types.h:56
static_always_inline void pppoe_lookup_1(BVT(clib_bihash)*table, pppoe_entry_key_t *cached_key, pppoe_entry_result_t *cached_result, u8 *mac0, u16 session_id0, pppoe_entry_key_t *key0, u32 *bucket0, pppoe_entry_result_t *result0)
Definition: pppoe.h:274
static char * pppoe_error_strings[]
Definition: pppoe_decap.c:393
vlib_node_registration_t pppoe_input_node
(constructor) VLIB_REGISTER_NODE (pppoe_input_node)
Definition: pppoe_decap.c:400
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:824
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
unsigned int u32
Definition: types.h:88
u64 raw
Definition: pppoe.h:126
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
struct pppoe_entry_result_t::@559::@561 fields
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:514
unsigned short u16
Definition: types.h:57
u16 session_id
Definition: pppoe.h:41
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
#define PREDICT_FALSE(x)
Definition: clib.h:111
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:368
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1180
pppoe_main_t pppoe_main
Definition: pppoe.c:38
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:212
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:312
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:465
pppoe_session_t * sessions
Definition: pppoe.h:154
vnet_main_t * vnet_main
Definition: pppoe.h:176
Definition: pppoe.h:135
u32 sw_if_index
Definition: pppoe.h:70
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
VLIB buffer representation.
Definition: buffer.h:102
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85