2 * l2_fwd.c : layer 2 forwarding using l2fib
4 * Copyright (c) 2013 Cisco 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/vnet.h>
20 #include <vnet/pg/pg.h>
21 #include <vnet/ethernet/ethernet.h>
24 #include <vnet/l2/l2_input.h>
25 #include <vnet/l2/l2_bvi.h>
26 #include <vnet/l2/l2_fwd.h>
27 #include <vnet/l2/l2_fib.h>
29 #include <vppinfra/error.h>
30 #include <vppinfra/hash.h>
31 #include <vppinfra/sparse_vec.h>
38 BVT (clib_bihash) * mac_table;
40 /* next node index for the L3 input node of each ethertype */
41 next_by_ethertype_t l3_next;
43 /* convenience variables */
44 vlib_main_t *vlib_main;
45 vnet_main_t *vnet_main;
50 /* per-pkt trace data */
57 /* packet trace format function */
59 format_l2fwd_trace (u8 * s, va_list * args)
61 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
62 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
63 l2fwd_trace_t *t = va_arg (*args, l2fwd_trace_t *);
65 s = format (s, "l2-fwd: sw_if_index %d dst %U src %U bd_index %d",
67 format_ethernet_address, t->dst,
68 format_ethernet_address, t->src, t->bd_index);
72 l2fwd_main_t l2fwd_main;
74 static vlib_node_registration_t l2fwd_node;
76 #define foreach_l2fwd_error \
77 _(L2FWD, "L2 forward packets") \
78 _(FLOOD, "L2 forward misses") \
79 _(HIT, "L2 forward hits") \
80 _(BVI_BAD_MAC, "BVI L3 MAC mismatch") \
81 _(BVI_ETHERTYPE, "BVI packet with unhandled ethertype") \
82 _(FILTER_DROP, "Filter Mac Drop") \
83 _(REFLECT_DROP, "Reflection Drop")
87 #define _(sym,str) L2FWD_ERROR_##sym,
93 static char *l2fwd_error_strings[] = {
94 #define _(sym,string) string,
101 L2FWD_NEXT_L2_OUTPUT,
107 /** Forward one packet based on the mac table lookup result. */
109 static_always_inline void
110 l2fwd_process (vlib_main_t * vm,
111 vlib_node_runtime_t * node,
113 vlib_error_main_t * em,
115 u32 sw_if_index0, l2fib_entry_result_t * result0, u32 * next0)
117 if (PREDICT_FALSE (result0->raw == ~0))
120 * lookup miss, so flood
121 * TODO:replicate packet to each intf in bridge-domain
124 if (vnet_buffer (b0)->l2.feature_bitmap & L2INPUT_FEAT_UU_FLOOD)
126 *next0 = L2FWD_NEXT_FLOOD;
130 /* Flooding is disabled */
131 b0->error = node->errors[L2FWD_ERROR_FLOOD];
132 *next0 = L2FWD_NEXT_DROP;
139 /* lookup hit, forward packet */
141 em->counters[node_counter_base_index + L2FWD_ERROR_HIT] += 1;
144 vnet_buffer (b0)->sw_if_index[VLIB_TX] = result0->fields.sw_if_index;
145 *next0 = L2FWD_NEXT_L2_OUTPUT;
147 /* perform reflection check */
148 if (PREDICT_FALSE (sw_if_index0 == result0->fields.sw_if_index))
150 b0->error = node->errors[L2FWD_ERROR_REFLECT_DROP];
151 *next0 = L2FWD_NEXT_DROP;
153 /* perform filter check */
155 else if (PREDICT_FALSE (result0->fields.filter))
157 b0->error = node->errors[L2FWD_ERROR_FILTER_DROP];
158 *next0 = L2FWD_NEXT_DROP;
160 /* perform BVI check */
162 else if (PREDICT_FALSE (result0->fields.bvi))
168 vnet_buffer (b0)->sw_if_index[VLIB_TX],
169 &msm->l3_next, next0);
171 if (PREDICT_FALSE (rc))
173 if (rc == TO_BVI_ERR_BAD_MAC)
175 b0->error = node->errors[L2FWD_ERROR_BVI_BAD_MAC];
176 *next0 = L2FWD_NEXT_DROP;
178 else if (rc == TO_BVI_ERR_ETHERTYPE)
180 b0->error = node->errors[L2FWD_ERROR_BVI_ETHERTYPE];
181 *next0 = L2FWD_NEXT_DROP;
190 l2fwd_node_fn (vlib_main_t * vm,
191 vlib_node_runtime_t * node, vlib_frame_t * frame)
193 u32 n_left_from, *from, *to_next;
194 l2fwd_next_t next_index;
195 l2fwd_main_t *msm = &l2fwd_main;
196 vlib_node_t *n = vlib_get_node (vm, l2fwd_node.index);
197 CLIB_UNUSED (u32 node_counter_base_index) = n->error_heap_index;
198 vlib_error_main_t *em = &vm->error_main;
199 l2fib_entry_key_t cached_key;
200 l2fib_entry_result_t cached_result;
202 /* Clear the one-entry cache in case mac table was updated */
204 cached_result.raw = ~0;
206 from = vlib_frame_vector_args (frame);
207 n_left_from = frame->n_vectors; /* number of packets to process */
208 next_index = node->cached_next_index;
210 while (n_left_from > 0)
214 /* get space to enqueue frame to graph node "next_index" */
215 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
217 while (n_left_from >= 4 && n_left_to_next >= 2)
220 vlib_buffer_t *b0, *b1;
222 u32 sw_if_index0, sw_if_index1;
223 ethernet_header_t *h0, *h1;
224 l2fib_entry_key_t key0, key1;
225 l2fib_entry_result_t result0, result1;
226 u32 bucket0, bucket1;
228 /* Prefetch next iteration. */
230 vlib_buffer_t *p2, *p3;
232 p2 = vlib_get_buffer (vm, from[2]);
233 p3 = vlib_get_buffer (vm, from[3]);
235 vlib_prefetch_buffer_header (p2, LOAD);
236 vlib_prefetch_buffer_header (p3, LOAD);
238 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
239 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
242 /* speculatively enqueue b0 and b1 to the current next frame */
243 /* bi is "buffer index", b is pointer to the buffer */
244 to_next[0] = bi0 = from[0];
245 to_next[1] = bi1 = from[1];
251 b0 = vlib_get_buffer (vm, bi0);
252 b1 = vlib_get_buffer (vm, bi1);
254 /* RX interface handles */
255 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
256 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
258 h0 = vlib_buffer_get_current (b0);
259 h1 = vlib_buffer_get_current (b1);
261 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
263 if (b0->flags & VLIB_BUFFER_IS_TRACED)
266 vlib_add_trace (vm, node, b0, sizeof (*t));
267 t->sw_if_index = sw_if_index0;
268 t->bd_index = vnet_buffer (b0)->l2.bd_index;
269 clib_memcpy (t->src, h0->src_address, 6);
270 clib_memcpy (t->dst, h0->dst_address, 6);
272 if (b1->flags & VLIB_BUFFER_IS_TRACED)
275 vlib_add_trace (vm, node, b1, sizeof (*t));
276 t->sw_if_index = sw_if_index1;
277 t->bd_index = vnet_buffer (b1)->l2.bd_index;
278 clib_memcpy (t->src, h1->src_address, 6);
279 clib_memcpy (t->dst, h1->dst_address, 6);
285 em->counters[node_counter_base_index + L2FWD_ERROR_L2FWD] += 2;
287 l2fib_lookup_2 (msm->mac_table, &cached_key, &cached_result, h0->dst_address, h1->dst_address, vnet_buffer (b0)->l2.bd_index, vnet_buffer (b1)->l2.bd_index, &key0, /* not used */
288 &key1, /* not used */
289 &bucket0, /* not used */
290 &bucket1, /* not used */
292 l2fwd_process (vm, node, msm, em, b0, sw_if_index0, &result0,
294 l2fwd_process (vm, node, msm, em, b1, sw_if_index1, &result1,
297 /* verify speculative enqueues, maybe switch current next frame */
298 /* if next0==next1==next_index then nothing special needs to be done */
299 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
300 to_next, n_left_to_next,
301 bi0, bi1, next0, next1);
304 while (n_left_from > 0 && n_left_to_next > 0)
310 ethernet_header_t *h0;
311 l2fib_entry_key_t key0;
312 l2fib_entry_result_t result0;
315 /* speculatively enqueue b0 to the current next frame */
323 b0 = vlib_get_buffer (vm, bi0);
325 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
327 h0 = vlib_buffer_get_current (b0);
329 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
330 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
332 l2fwd_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
333 t->sw_if_index = sw_if_index0;
334 t->bd_index = vnet_buffer (b0)->l2.bd_index;
335 clib_memcpy (t->src, h0->src_address, 6);
336 clib_memcpy (t->dst, h0->dst_address, 6);
341 em->counters[node_counter_base_index + L2FWD_ERROR_L2FWD] += 1;
343 l2fib_lookup_1 (msm->mac_table, &cached_key, &cached_result, h0->dst_address, vnet_buffer (b0)->l2.bd_index, &key0, /* not used */
344 &bucket0, /* not used */
346 l2fwd_process (vm, node, msm, em, b0, sw_if_index0, &result0,
349 /* verify speculative enqueue, maybe switch current next frame */
350 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
351 to_next, n_left_to_next,
355 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
358 return frame->n_vectors;
362 VLIB_REGISTER_NODE (l2fwd_node,static) = {
363 .function = l2fwd_node_fn,
365 .vector_size = sizeof (u32),
366 .format_trace = format_l2fwd_trace,
367 .type = VLIB_NODE_TYPE_INTERNAL,
369 .n_errors = ARRAY_LEN(l2fwd_error_strings),
370 .error_strings = l2fwd_error_strings,
372 .n_next_nodes = L2FWD_N_NEXT,
374 /* edit / add dispositions here */
376 [L2FWD_NEXT_L2_OUTPUT] = "l2-output",
377 [L2FWD_NEXT_FLOOD] = "l2-flood",
378 [L2FWD_NEXT_DROP] = "error-drop",
383 VLIB_NODE_FUNCTION_MULTIARCH (l2fwd_node, l2fwd_node_fn)
384 clib_error_t *l2fwd_init (vlib_main_t * vm)
386 l2fwd_main_t *mp = &l2fwd_main;
389 mp->vnet_main = vnet_get_main ();
391 /* init the hash table ptr */
392 mp->mac_table = get_mac_table ();
394 /* Initialize the next nodes for each ethertype */
395 next_by_ethertype_init (&mp->l3_next);
400 VLIB_INIT_FUNCTION (l2fwd_init);
403 /** Add the L3 input node for this ethertype to the next nodes structure. */
405 l2fwd_register_input_type (vlib_main_t * vm,
406 ethernet_type_t type, u32 node_index)
408 l2fwd_main_t *mp = &l2fwd_main;
411 next_index = vlib_node_add_next (vm, l2fwd_node.index, node_index);
413 next_by_ethertype_register (&mp->l3_next, type, next_index);
418 * Set subinterface forward enable/disable.
420 * set interface l2 forward <interface> [disable]
422 static clib_error_t *
423 int_fwd (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd)
425 vnet_main_t *vnm = vnet_get_main ();
426 clib_error_t *error = 0;
430 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
432 error = clib_error_return (0, "unknown interface `%U'",
433 format_unformat_error, input);
438 if (unformat (input, "disable"))
443 /* set the interface flag */
444 if (l2input_intf_config (sw_if_index)->xconnect)
446 l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_XCONNECT, enable);
450 l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_FWD, enable);
458 VLIB_CLI_COMMAND (int_fwd_cli, static) = {
459 .path = "set interface l2 forward",
460 .short_help = "set interface l2 forward <interface> [disable]",
466 * fd.io coding-style-patch-verification: ON
469 * eval: (c-set-style "gnu")