2 * decap.c: pppoe session decap packet processing
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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include <vlib/vlib.h>
19 #include <vnet/ppp/packet.h>
20 #include <pppoe/pppoe.h>
29 static u8 * format_pppoe_rx_trace (u8 * s, va_list * args)
31 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
32 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
33 pppoe_rx_trace_t * t = va_arg (*args, pppoe_rx_trace_t *);
35 if (t->session_index != ~0)
37 s = format (s, "PPPoE decap from pppoe_session%d session_id %d next %d error %d",
38 t->session_index, t->session_id, t->next_index, t->error);
42 s = format (s, "PPPoE decap error - session for session_id %d does not exist",
48 VLIB_NODE_FN (pppoe_input_node) (vlib_main_t * vm,
49 vlib_node_runtime_t * node,
50 vlib_frame_t * from_frame)
52 u32 n_left_from, next_index, * from, * to_next;
53 pppoe_main_t * pem = &pppoe_main;
54 vnet_main_t * vnm = pem->vnet_main;
55 vnet_interface_main_t * im = &vnm->interface_main;
56 u32 pkts_decapsulated = 0;
57 u32 thread_index = vlib_get_thread_index();
58 u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
59 pppoe_entry_key_t cached_key;
60 pppoe_entry_result_t cached_result;
62 from = vlib_frame_vector_args (from_frame);
63 n_left_from = from_frame->n_vectors;
65 /* Clear the one-entry cache in case session table was updated */
67 cached_result.raw = ~0; /* warning be gone */
69 next_index = node->cached_next_index;
70 stats_sw_if_index = node->runtime_data[0];
71 stats_n_packets = stats_n_bytes = 0;
73 while (n_left_from > 0)
77 vlib_get_next_frame (vm, node, next_index,
78 to_next, n_left_to_next);
79 while (n_left_from >= 4 && n_left_to_next >= 2)
82 vlib_buffer_t * b0, * b1;
84 ethernet_header_t *h0, *h1;
85 pppoe_header_t * pppoe0, * pppoe1;
86 u16 ppp_proto0 = 0, ppp_proto1 = 0;
87 pppoe_session_t * t0, * t1;
89 u32 sw_if_index0, sw_if_index1, len0, len1;
90 pppoe_entry_key_t key0, key1;
91 pppoe_entry_result_t result0, result1;
94 /* Prefetch next iteration. */
96 vlib_buffer_t * p2, * p3;
98 p2 = vlib_get_buffer (vm, from[2]);
99 p3 = vlib_get_buffer (vm, from[3]);
101 vlib_prefetch_buffer_header (p2, LOAD);
102 vlib_prefetch_buffer_header (p3, LOAD);
104 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
105 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
117 b0 = vlib_get_buffer (vm, bi0);
118 b1 = vlib_get_buffer (vm, bi1);
122 /* leaves current_data pointing at the pppoe header */
123 pppoe0 = vlib_buffer_get_current (b0);
124 pppoe1 = vlib_buffer_get_current (b1);
125 ppp_proto0 = clib_net_to_host_u16(pppoe0->ppp_proto);
126 ppp_proto1 = clib_net_to_host_u16(pppoe1->ppp_proto);
128 /* Manipulate packet 0 */
129 if ((ppp_proto0 != PPP_PROTOCOL_ip4)
130 && (ppp_proto0 != PPP_PROTOCOL_ip6))
132 error0 = PPPOE_ERROR_CONTROL_PLANE;
133 next0 = PPPOE_INPUT_NEXT_CP_INPUT;
138 vlib_buffer_reset(b0);
139 h0 = vlib_buffer_get_current (b0);
141 pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
142 h0->src_address, pppoe0->session_id,
143 &key0, &bucket0, &result0);
144 if (PREDICT_FALSE (result0.fields.session_index == ~0))
146 error0 = PPPOE_ERROR_NO_SUCH_SESSION;
147 next0 = PPPOE_INPUT_NEXT_DROP;
151 t0 = pool_elt_at_index (pem->sessions,
152 result0.fields.session_index);
154 /* Pop Eth and PPPoE header */
155 vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0));
157 next0 = (ppp_proto0==PPP_PROTOCOL_ip4)?
158 PPPOE_INPUT_NEXT_IP4_INPUT
159 : PPPOE_INPUT_NEXT_IP6_INPUT;
161 sw_if_index0 = t0->sw_if_index;
162 len0 = vlib_buffer_length_in_chain (vm, b0);
164 pkts_decapsulated ++;
165 stats_n_packets += 1;
166 stats_n_bytes += len0;
168 /* Batch stats increment on the same pppoe session so counter
169 is not incremented per packet */
170 if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
172 stats_n_packets -= 1;
173 stats_n_bytes -= len0;
175 vlib_increment_combined_counter
176 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
177 thread_index, stats_sw_if_index,
178 stats_n_packets, stats_n_bytes);
180 stats_n_bytes = len0;
181 stats_sw_if_index = sw_if_index0;
185 b0->error = error0 ? node->errors[error0] : 0;
187 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
190 = vlib_add_trace (vm, node, b0, sizeof (*tr));
191 tr->next_index = next0;
193 tr->session_index = result0.fields.session_index;
194 tr->session_id = clib_net_to_host_u32(pppoe0->session_id);
198 /* Manipulate packet 1 */
199 if ((ppp_proto1 != PPP_PROTOCOL_ip4)
200 && (ppp_proto1 != PPP_PROTOCOL_ip6))
202 error1 = PPPOE_ERROR_CONTROL_PLANE;
203 next1 = PPPOE_INPUT_NEXT_CP_INPUT;
208 vlib_buffer_reset(b1);
209 h1 = vlib_buffer_get_current (b1);
211 pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
212 h1->src_address, pppoe1->session_id,
213 &key1, &bucket1, &result1);
214 if (PREDICT_FALSE (result1.fields.session_index == ~0))
216 error1 = PPPOE_ERROR_NO_SUCH_SESSION;
217 next1 = PPPOE_INPUT_NEXT_DROP;
221 t1 = pool_elt_at_index (pem->sessions,
222 result1.fields.session_index);
224 /* Pop Eth and PPPoE header */
225 vlib_buffer_advance(b1, sizeof(*h1)+sizeof(*pppoe1));
227 next1 = (ppp_proto1==PPP_PROTOCOL_ip4)?
228 PPPOE_INPUT_NEXT_IP4_INPUT
229 : PPPOE_INPUT_NEXT_IP6_INPUT;
231 sw_if_index1 = t1->sw_if_index;
232 len1 = vlib_buffer_length_in_chain (vm, b1);
234 pkts_decapsulated ++;
235 stats_n_packets += 1;
236 stats_n_bytes += len1;
238 /* Batch stats increment on the same pppoe session so counter
239 is not incremented per packet */
240 if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
242 stats_n_packets -= 1;
243 stats_n_bytes -= len1;
245 vlib_increment_combined_counter
246 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
247 thread_index, stats_sw_if_index,
248 stats_n_packets, stats_n_bytes);
250 stats_n_bytes = len1;
251 stats_sw_if_index = sw_if_index1;
255 b1->error = error1 ? node->errors[error1] : 0;
257 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
260 = vlib_add_trace (vm, node, b1, sizeof (*tr));
261 tr->next_index = next1;
263 tr->session_index = result1.fields.session_index;
264 tr->session_id = clib_net_to_host_u32(pppoe1->session_id);
267 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
268 to_next, n_left_to_next,
269 bi0, bi1, next0, next1);
272 while (n_left_from > 0 && n_left_to_next > 0)
277 ethernet_header_t *h0;
278 pppoe_header_t * pppoe0;
280 pppoe_session_t * t0;
282 u32 sw_if_index0, len0;
283 pppoe_entry_key_t key0;
284 pppoe_entry_result_t result0;
294 b0 = vlib_get_buffer (vm, bi0);
297 /* leaves current_data pointing at the pppoe header */
298 pppoe0 = vlib_buffer_get_current (b0);
299 ppp_proto0 = clib_net_to_host_u16(pppoe0->ppp_proto);
301 if ((ppp_proto0 != PPP_PROTOCOL_ip4)
302 && (ppp_proto0 != PPP_PROTOCOL_ip6))
304 error0 = PPPOE_ERROR_CONTROL_PLANE;
305 next0 = PPPOE_INPUT_NEXT_CP_INPUT;
310 vlib_buffer_reset(b0);
311 h0 = vlib_buffer_get_current (b0);
313 pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
314 h0->src_address, pppoe0->session_id,
315 &key0, &bucket0, &result0);
316 if (PREDICT_FALSE (result0.fields.session_index == ~0))
318 error0 = PPPOE_ERROR_NO_SUCH_SESSION;
319 next0 = PPPOE_INPUT_NEXT_DROP;
323 t0 = pool_elt_at_index (pem->sessions,
324 result0.fields.session_index);
326 /* Pop Eth and PPPoE header */
327 vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0));
329 next0 = (ppp_proto0==PPP_PROTOCOL_ip4)?
330 PPPOE_INPUT_NEXT_IP4_INPUT
331 : PPPOE_INPUT_NEXT_IP6_INPUT;
333 sw_if_index0 = t0->sw_if_index;
334 len0 = vlib_buffer_length_in_chain (vm, b0);
336 pkts_decapsulated ++;
337 stats_n_packets += 1;
338 stats_n_bytes += len0;
340 /* Batch stats increment on the same pppoe session so counter
341 is not incremented per packet */
342 if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
344 stats_n_packets -= 1;
345 stats_n_bytes -= len0;
347 vlib_increment_combined_counter
348 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
349 thread_index, stats_sw_if_index,
350 stats_n_packets, stats_n_bytes);
352 stats_n_bytes = len0;
353 stats_sw_if_index = sw_if_index0;
357 b0->error = error0 ? node->errors[error0] : 0;
359 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
362 = vlib_add_trace (vm, node, b0, sizeof (*tr));
363 tr->next_index = next0;
365 tr->session_index = result0.fields.session_index;
366 tr->session_id = clib_net_to_host_u16(pppoe0->session_id);
368 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
369 to_next, n_left_to_next,
373 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
375 /* Do we still need this now that session tx stats is kept? */
376 vlib_node_increment_counter (vm, pppoe_input_node.index,
377 PPPOE_ERROR_DECAPSULATED,
380 /* Increment any remaining batch stats */
383 vlib_increment_combined_counter
384 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
385 thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
386 node->runtime_data[0] = stats_sw_if_index;
389 return from_frame->n_vectors;
392 #ifndef CLIB_MARCH_VARIANT
393 char * pppoe_error_strings[] = {
394 #define pppoe_error(n,s) s,
395 #include <pppoe/pppoe_error.def>
399 #endif /* CLIB_MARCH_VARIANT */
401 VLIB_REGISTER_NODE (pppoe_input_node) = {
402 .name = "pppoe-input",
403 /* Takes a vector of packets. */
404 .vector_size = sizeof (u32),
406 .n_errors = PPPOE_N_ERROR,
407 .error_strings = pppoe_error_strings,
409 .n_next_nodes = PPPOE_INPUT_N_NEXT,
411 #define _(s,n) [PPPOE_INPUT_NEXT_##s] = n,
412 foreach_pppoe_input_next
416 .format_trace = format_pppoe_rx_trace,