2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/mfib/mfib_itf.h>
17 #include <vnet/mfib/mfib_entry.h>
18 #include <vnet/dpo/replicate_dpo.h>
19 #include <vnet/mfib/ip4_mfib.h>
20 #include <vnet/mfib/ip6_mfib.h>
21 #include <vnet/mfib/mfib_signal.h>
22 #include <vnet/fib/ip4_fib.h>
23 #include <vnet/fib/ip6_fib.h>
25 #include <vnet/ip/ip4.h>
26 #include <vnet/vnet.h>
28 typedef struct mfib_forward_lookup_trace_t_ {
31 } mfib_forward_lookup_trace_t;
34 format_mfib_forward_lookup_trace (u8 * s, va_list * args)
36 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
37 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
38 mfib_forward_lookup_trace_t * t = va_arg (*args, mfib_forward_lookup_trace_t *);
40 s = format (s, "fib %d entry %d", t->fib_index, t->entry_index);
44 /* Common trace function for all ip4-forward next nodes. */
46 mfib_forward_lookup_trace (vlib_main_t * vm,
47 vlib_node_runtime_t * node,
51 ip4_main_t * im = &ip4_main;
53 n_left = frame->n_vectors;
54 from = vlib_frame_vector_args (frame);
58 mfib_forward_lookup_trace_t * t0, * t1;
59 vlib_buffer_t * b0, * b1;
62 /* Prefetch next iteration. */
63 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
64 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
69 b0 = vlib_get_buffer (vm, bi0);
70 b1 = vlib_get_buffer (vm, bi1);
72 if (b0->flags & VLIB_BUFFER_IS_TRACED)
74 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
75 t0->entry_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
76 t0->fib_index = vec_elt (im->mfib_index_by_sw_if_index,
77 vnet_buffer(b1)->sw_if_index[VLIB_RX]);
79 if (b1->flags & VLIB_BUFFER_IS_TRACED)
81 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
82 t1->entry_index = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
83 t1->fib_index = vec_elt (im->mfib_index_by_sw_if_index,
84 vnet_buffer(b1)->sw_if_index[VLIB_RX]);
92 mfib_forward_lookup_trace_t * t0;
98 b0 = vlib_get_buffer (vm, bi0);
100 if (b0->flags & VLIB_BUFFER_IS_TRACED)
102 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
103 t0->entry_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
104 t0->fib_index = vec_elt (im->mfib_index_by_sw_if_index,
105 vnet_buffer(b0)->sw_if_index[VLIB_RX]);
112 typedef enum mfib_forward_lookup_next_t_ {
113 MFIB_FORWARD_LOOKUP_NEXT_RPF,
114 MFIB_FORWARD_LOOKUP_N_NEXT,
115 } mfib_forward_lookup_next_t;
118 mfib_forward_lookup (vlib_main_t * vm,
119 vlib_node_runtime_t * node,
120 vlib_frame_t * frame,
123 u32 n_left_from, n_left_to_next, * from, * to_next;
125 from = vlib_frame_vector_args (frame);
126 n_left_from = frame->n_vectors;
128 while (n_left_from > 0)
130 vlib_get_next_frame (vm, node, MFIB_FORWARD_LOOKUP_NEXT_RPF,
131 to_next, n_left_to_next);
133 while (n_left_from > 0 && n_left_to_next > 0)
135 fib_node_index_t mfei0;
147 p0 = vlib_get_buffer (vm, pi0);
153 fib_index0 = vec_elt (ip4_main.mfib_index_by_sw_if_index,
154 vnet_buffer(p0)->sw_if_index[VLIB_RX]);
155 ip0 = vlib_buffer_get_current (p0);
156 mfei0 = ip4_mfib_table_lookup(ip4_mfib_get(fib_index0),
165 fib_index0 = vec_elt (ip6_main.mfib_index_by_sw_if_index,
166 vnet_buffer(p0)->sw_if_index[VLIB_RX]);
167 ip0 = vlib_buffer_get_current (p0);
168 mfei0 = ip6_mfib_table_fwd_lookup(ip6_mfib_get(fib_index0),
173 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = mfei0;
176 vlib_put_next_frame(vm, node,
177 MFIB_FORWARD_LOOKUP_NEXT_RPF,
181 if (node->flags & VLIB_NODE_FLAG_TRACE)
182 mfib_forward_lookup_trace(vm, node, frame);
184 return frame->n_vectors;
187 VLIB_NODE_FN (ip4_mfib_forward_lookup_node) (vlib_main_t * vm,
188 vlib_node_runtime_t * node,
189 vlib_frame_t * frame)
191 return (mfib_forward_lookup (vm, node, frame, 1));
194 VLIB_REGISTER_NODE (ip4_mfib_forward_lookup_node) = {
195 .name = "ip4-mfib-forward-lookup",
196 .vector_size = sizeof (u32),
198 .format_trace = format_mfib_forward_lookup_trace,
200 .n_next_nodes = MFIB_FORWARD_LOOKUP_N_NEXT,
202 [MFIB_FORWARD_LOOKUP_NEXT_RPF] = "ip4-mfib-forward-rpf",
206 VLIB_NODE_FN (ip6_mfib_forward_lookup_node) (vlib_main_t * vm,
207 vlib_node_runtime_t * node,
208 vlib_frame_t * frame)
210 return (mfib_forward_lookup (vm, node, frame, 0));
213 VLIB_REGISTER_NODE (ip6_mfib_forward_lookup_node) = {
214 .name = "ip6-mfib-forward-lookup",
215 .vector_size = sizeof (u32),
217 .format_trace = format_mfib_forward_lookup_trace,
219 .n_next_nodes = MFIB_FORWARD_LOOKUP_N_NEXT,
221 [MFIB_FORWARD_LOOKUP_NEXT_RPF] = "ip6-mfib-forward-rpf",
226 typedef struct mfib_forward_rpf_trace_t_ {
229 mfib_itf_flags_t itf_flags;
230 } mfib_forward_rpf_trace_t;
232 typedef enum mfib_forward_rpf_next_t_ {
233 MFIB_FORWARD_RPF_NEXT_DROP,
234 MFIB_FORWARD_RPF_N_NEXT,
235 } mfib_forward_rpf_next_t;
238 format_mfib_forward_rpf_trace (u8 * s, va_list * args)
240 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
241 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
242 mfib_forward_rpf_trace_t * t = va_arg (*args, mfib_forward_rpf_trace_t *);
244 s = format (s, "entry %d", t->entry_index);
245 s = format (s, " itf %d", t->sw_if_index);
246 s = format (s, " flags %U", format_mfib_itf_flags, t->itf_flags);
252 mfib_forward_connected_check (vlib_buffer_t * b0,
257 * Lookup the source of the IP packet in the
258 * FIB. return true if the entry is attached.
267 ip0 = vlib_buffer_get_current(b0);
269 lbi0 = ip4_fib_forwarding_lookup(
270 ip4_fib_table_get_index_for_sw_if_index(
273 lb0 = load_balance_get(lbi0);
275 return (FIB_ENTRY_FLAG_ATTACHED &
276 lb0->lb_fib_entry_flags);
286 mfib_forward_itf_signal (vlib_main_t *vm,
287 const mfib_entry_t *mfe,
291 mfib_itf_flags_t old_flags;
293 old_flags = clib_atomic_fetch_or(&mfi->mfi_flags,
294 MFIB_ITF_FLAG_SIGNAL_PRESENT);
296 if (!(old_flags & MFIB_ITF_FLAG_SIGNAL_PRESENT))
299 * we were the lucky ones to set the signal present flag
301 if (!(old_flags & MFIB_ITF_FLAG_DONT_PRESERVE))
304 * preserve a copy of the packet for the control
306 * Only allow one preserved packet at at time, since
307 * when the signal present flag is cleared so is the
310 mfib_signal_push(mfe, mfi, b0);
315 * The control plane just wants the signal, not the packet as well
317 mfib_signal_push(mfe, mfi, NULL);
322 * there is already a signal present on this interface that the
323 * control plane has not yet acknowledged
328 mfib_forward_rpf (vlib_main_t * vm,
329 vlib_node_runtime_t * node,
330 vlib_frame_t * frame,
333 u32 n_left_from, n_left_to_next, * from, * to_next;
334 mfib_forward_rpf_next_t next;
335 vlib_node_runtime_t *error_node;
338 error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
340 error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
341 from = vlib_frame_vector_args (frame);
342 n_left_from = frame->n_vectors;
343 next = MFIB_FORWARD_RPF_NEXT_DROP;
345 while (n_left_from > 0)
347 vlib_get_next_frame (vm, node, next,
348 to_next, n_left_to_next);
350 while (n_left_from > 0 && n_left_to_next > 0)
352 fib_node_index_t mfei0;
353 const mfib_entry_t *mfe0;
357 mfib_itf_flags_t iflags0;
358 mfib_entry_flags_t eflags0;
368 error0 = IP4_ERROR_NONE;
369 b0 = vlib_get_buffer (vm, pi0);
370 mfei0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
371 mfe0 = mfib_entry_get(mfei0);
372 mfi0 = mfib_entry_get_itf(mfe0,
373 vnet_buffer(b0)->sw_if_index[VLIB_RX]);
376 * throughout this function we are 'PREDICT' optimising
377 * for the case of throughput traffic that is not replicated
378 * to the host stack nor sets local flags
382 * If the mfib entry has a configured RPF-ID check that
383 * in preference to an interface based RPF
385 if (MFIB_RPF_ID_NONE != mfe0->mfe_rpf_id)
387 iflags0 = (mfe0->mfe_rpf_id == vnet_buffer(b0)->ip.rpf_id ?
388 MFIB_ITF_FLAG_ACCEPT :
393 if (PREDICT_TRUE(NULL != mfi0))
395 iflags0 = mfi0->mfi_flags;
399 iflags0 = MFIB_ITF_FLAG_NONE;
402 eflags0 = mfe0->mfe_flags;
404 if (PREDICT_FALSE(eflags0 & MFIB_ENTRY_FLAG_CONNECTED))
407 * lookup the source in the unicast FIB - check it
408 * matches a connected.
410 if (mfib_forward_connected_check(
412 vnet_buffer(b0)->sw_if_index[VLIB_RX],
415 mfib_forward_itf_signal(vm, mfe0, mfi0, b0);
418 if (PREDICT_FALSE((eflags0 & MFIB_ENTRY_FLAG_SIGNAL) ^
419 (iflags0 & MFIB_ITF_FLAG_NEGATE_SIGNAL)))
422 * Entry signal XOR interface negate-signal
426 mfib_forward_itf_signal(vm, mfe0, mfi0, b0);
430 if (PREDICT_TRUE((iflags0 & MFIB_ITF_FLAG_ACCEPT) ||
431 (eflags0 & MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF)))
434 * This interface is accepting packets for the matching entry
436 next0 = mfe0->mfe_rep.dpoi_next_node;
438 vnet_buffer(b0)->ip.adj_index[VLIB_TX] =
439 mfe0->mfe_rep.dpoi_index;
443 next0 = MFIB_FORWARD_RPF_NEXT_DROP;
444 error0 = IP4_ERROR_RPF_FAILURE;
447 b0->error = error0 ? error_node->errors[error0] : 0;
449 if (b0->flags & VLIB_BUFFER_IS_TRACED)
451 mfib_forward_rpf_trace_t *t0;
453 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
454 t0->entry_index = mfei0;
455 t0->itf_flags = iflags0;
458 t0->sw_if_index = ~0;
462 t0->sw_if_index = mfi0->mfi_sw_if_index;
465 vlib_validate_buffer_enqueue_x1 (vm, node, next,
466 to_next, n_left_to_next,
470 vlib_put_next_frame(vm, node, next, n_left_to_next);
473 return frame->n_vectors;
476 VLIB_NODE_FN (ip4_mfib_forward_rpf_node) (vlib_main_t * vm,
477 vlib_node_runtime_t * node,
478 vlib_frame_t * frame)
480 return (mfib_forward_rpf(vm, node, frame, 1));
484 VLIB_REGISTER_NODE (ip4_mfib_forward_rpf_node) = {
485 .name = "ip4-mfib-forward-rpf",
486 .vector_size = sizeof (u32),
488 .format_trace = format_mfib_forward_rpf_trace,
490 .n_next_nodes = MFIB_FORWARD_RPF_N_NEXT,
492 [MFIB_FORWARD_RPF_NEXT_DROP] = "ip4-drop",
496 VLIB_NODE_FN (ip6_mfib_forward_rpf_node) (vlib_main_t * vm,
497 vlib_node_runtime_t * node,
498 vlib_frame_t * frame)
500 return (mfib_forward_rpf(vm, node, frame, 0));
504 VLIB_REGISTER_NODE (ip6_mfib_forward_rpf_node) = {
505 .name = "ip6-mfib-forward-rpf",
506 .vector_size = sizeof (u32),
508 .format_trace = format_mfib_forward_rpf_trace,
510 .n_next_nodes = MFIB_FORWARD_RPF_N_NEXT,
512 [MFIB_FORWARD_RPF_NEXT_DROP] = "ip6-drop",