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/pg/pg.h>
20 #include <vnet/ppp/packet.h>
21 #include <pppoe/pppoe.h>
30 static u8 * format_pppoe_rx_trace (u8 * s, va_list * args)
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 *);
36 if (t->session_index != ~0)
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);
43 s = format (s, "PPPoE decap error - session for session_id %d does not exist",
49 VLIB_NODE_FN (pppoe_input_node) (vlib_main_t * vm,
50 vlib_node_runtime_t * node,
51 vlib_frame_t * from_frame)
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;
56 vnet_interface_main_t * im = &vnm->interface_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;
63 from = vlib_frame_vector_args (from_frame);
64 n_left_from = from_frame->n_vectors;
66 /* Clear the one-entry cache in case session table was updated */
68 cached_result.raw = ~0; /* warning be gone */
70 next_index = node->cached_next_index;
71 stats_sw_if_index = node->runtime_data[0];
72 stats_n_packets = stats_n_bytes = 0;
74 while (n_left_from > 0)
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)
83 vlib_buffer_t * b0, * b1;
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;
90 u32 sw_if_index0, sw_if_index1, len0, len1;
91 pppoe_entry_key_t key0, key1;
92 pppoe_entry_result_t result0, result1;
95 /* Prefetch next iteration. */
97 vlib_buffer_t * p2, * p3;
99 p2 = vlib_get_buffer (vm, from[2]);
100 p3 = vlib_get_buffer (vm, from[3]);
102 vlib_prefetch_buffer_header (p2, LOAD);
103 vlib_prefetch_buffer_header (p3, LOAD);
105 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
106 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
118 b0 = vlib_get_buffer (vm, bi0);
119 b1 = vlib_get_buffer (vm, bi1);
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);
129 /* Manipulate packet 0 */
130 if ((ppp_proto0 != PPP_PROTOCOL_ip4)
131 && (ppp_proto0 != PPP_PROTOCOL_ip6))
133 error0 = PPPOE_ERROR_CONTROL_PLANE;
134 next0 = PPPOE_INPUT_NEXT_CP_INPUT;
139 vlib_buffer_reset(b0);
140 h0 = vlib_buffer_get_current (b0);
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))
147 error0 = PPPOE_ERROR_NO_SUCH_SESSION;
148 next0 = PPPOE_INPUT_NEXT_DROP;
152 t0 = pool_elt_at_index (pem->sessions,
153 result0.fields.session_index);
155 /* Pop Eth and PPPoE header */
156 vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0));
158 next0 = (ppp_proto0==PPP_PROTOCOL_ip4)?
159 PPPOE_INPUT_NEXT_IP4_INPUT
160 : PPPOE_INPUT_NEXT_IP6_INPUT;
162 sw_if_index0 = t0->sw_if_index;
163 len0 = vlib_buffer_length_in_chain (vm, b0);
165 pkts_decapsulated ++;
166 stats_n_packets += 1;
167 stats_n_bytes += len0;
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))
173 stats_n_packets -= 1;
174 stats_n_bytes -= len0;
176 vlib_increment_combined_counter
177 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
178 thread_index, stats_sw_if_index,
179 stats_n_packets, stats_n_bytes);
181 stats_n_bytes = len0;
182 stats_sw_if_index = sw_if_index0;
186 b0->error = error0 ? node->errors[error0] : 0;
188 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
191 = vlib_add_trace (vm, node, b0, sizeof (*tr));
192 tr->next_index = next0;
194 tr->session_index = result0.fields.session_index;
195 tr->session_id = clib_net_to_host_u32(pppoe0->session_id);
199 /* Manipulate packet 1 */
200 if ((ppp_proto1 != PPP_PROTOCOL_ip4)
201 && (ppp_proto1 != PPP_PROTOCOL_ip6))
203 error1 = PPPOE_ERROR_CONTROL_PLANE;
204 next1 = PPPOE_INPUT_NEXT_CP_INPUT;
209 vlib_buffer_reset(b1);
210 h1 = vlib_buffer_get_current (b1);
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))
217 error1 = PPPOE_ERROR_NO_SUCH_SESSION;
218 next1 = PPPOE_INPUT_NEXT_DROP;
222 t1 = pool_elt_at_index (pem->sessions,
223 result1.fields.session_index);
225 /* Pop Eth and PPPoE header */
226 vlib_buffer_advance(b1, sizeof(*h1)+sizeof(*pppoe1));
228 next1 = (ppp_proto1==PPP_PROTOCOL_ip4)?
229 PPPOE_INPUT_NEXT_IP4_INPUT
230 : PPPOE_INPUT_NEXT_IP6_INPUT;
232 sw_if_index1 = t1->sw_if_index;
233 len1 = vlib_buffer_length_in_chain (vm, b1);
235 pkts_decapsulated ++;
236 stats_n_packets += 1;
237 stats_n_bytes += len1;
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))
243 stats_n_packets -= 1;
244 stats_n_bytes -= len1;
246 vlib_increment_combined_counter
247 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
248 thread_index, stats_sw_if_index,
249 stats_n_packets, stats_n_bytes);
251 stats_n_bytes = len1;
252 stats_sw_if_index = sw_if_index1;
256 b1->error = error1 ? node->errors[error1] : 0;
258 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
261 = vlib_add_trace (vm, node, b1, sizeof (*tr));
262 tr->next_index = next1;
264 tr->session_index = result1.fields.session_index;
265 tr->session_id = clib_net_to_host_u32(pppoe1->session_id);
268 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
269 to_next, n_left_to_next,
270 bi0, bi1, next0, next1);
273 while (n_left_from > 0 && n_left_to_next > 0)
278 ethernet_header_t *h0;
279 pppoe_header_t * pppoe0;
281 pppoe_session_t * t0;
283 u32 sw_if_index0, len0;
284 pppoe_entry_key_t key0;
285 pppoe_entry_result_t result0;
295 b0 = vlib_get_buffer (vm, bi0);
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);
302 if ((ppp_proto0 != PPP_PROTOCOL_ip4)
303 && (ppp_proto0 != PPP_PROTOCOL_ip6))
305 error0 = PPPOE_ERROR_CONTROL_PLANE;
306 next0 = PPPOE_INPUT_NEXT_CP_INPUT;
311 vlib_buffer_reset(b0);
312 h0 = vlib_buffer_get_current (b0);
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))
319 error0 = PPPOE_ERROR_NO_SUCH_SESSION;
320 next0 = PPPOE_INPUT_NEXT_DROP;
324 t0 = pool_elt_at_index (pem->sessions,
325 result0.fields.session_index);
327 /* Pop Eth and PPPoE header */
328 vlib_buffer_advance(b0, sizeof(*h0)+sizeof(*pppoe0));
330 next0 = (ppp_proto0==PPP_PROTOCOL_ip4)?
331 PPPOE_INPUT_NEXT_IP4_INPUT
332 : PPPOE_INPUT_NEXT_IP6_INPUT;
334 sw_if_index0 = t0->sw_if_index;
335 len0 = vlib_buffer_length_in_chain (vm, b0);
337 pkts_decapsulated ++;
338 stats_n_packets += 1;
339 stats_n_bytes += len0;
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))
345 stats_n_packets -= 1;
346 stats_n_bytes -= len0;
348 vlib_increment_combined_counter
349 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
350 thread_index, stats_sw_if_index,
351 stats_n_packets, stats_n_bytes);
353 stats_n_bytes = len0;
354 stats_sw_if_index = sw_if_index0;
358 b0->error = error0 ? node->errors[error0] : 0;
360 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
363 = vlib_add_trace (vm, node, b0, sizeof (*tr));
364 tr->next_index = next0;
366 tr->session_index = result0.fields.session_index;
367 tr->session_id = clib_net_to_host_u16(pppoe0->session_id);
369 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
370 to_next, n_left_to_next,
374 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
376 /* Do we still need this now that session tx stats is kept? */
377 vlib_node_increment_counter (vm, pppoe_input_node.index,
378 PPPOE_ERROR_DECAPSULATED,
381 /* Increment any remaining batch stats */
384 vlib_increment_combined_counter
385 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
386 thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
387 node->runtime_data[0] = stats_sw_if_index;
390 return from_frame->n_vectors;
393 static char * pppoe_error_strings[] = {
394 #define pppoe_error(n,s) s,
395 #include <pppoe/pppoe_error.def>
400 VLIB_REGISTER_NODE (pppoe_input_node) = {
401 .name = "pppoe-input",
402 /* Takes a vector of packets. */
403 .vector_size = sizeof (u32),
405 .n_errors = PPPOE_N_ERROR,
406 .error_strings = pppoe_error_strings,
408 .n_next_nodes = PPPOE_INPUT_N_NEXT,
410 #define _(s,n) [PPPOE_INPUT_NEXT_##s] = n,
411 foreach_pppoe_input_next
415 .format_trace = format_pppoe_rx_trace,