2 * l2_input.c : layer 2 input packet processing
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>
22 #include <vnet/ethernet/packet.h>
23 #include <vnet/ip/ip_packet.h>
24 #include <vnet/ip/ip4_packet.h>
25 #include <vnet/ip/ip6_packet.h>
26 #include <vnet/fib/fib_node.h>
27 #include <vnet/ethernet/arp_packet.h>
29 #include <vnet/l2/l2_input.h>
30 #include <vnet/l2/l2_output.h>
31 #include <vnet/l2/feat_bitmap.h>
32 #include <vnet/l2/l2_bvi.h>
33 #include <vnet/l2/l2_fib.h>
34 #include <vnet/l2/l2_bd.h>
36 #include <vppinfra/error.h>
37 #include <vppinfra/hash.h>
38 #include <vppinfra/cache.h>
42 * @brief Interface Input Mode (Layer 2 Cross-Connect or Bridge / Layer 3).
44 * This file contains the CLI Commands that modify the input mode of an
45 * interface. For interfaces in a Layer 2 cross-connect, all packets
46 * received on one interface will be transmitted to the other. For
47 * interfaces in a bridge-domain, packets will be forwarded to other
48 * interfaces in the same bridge-domain based on destination mac address.
49 * For interfaces in Layer 3 mode, the packets will be routed.
52 /* Feature graph node names */
53 static char *l2input_feat_names[] = {
54 #define _(sym,name) name,
60 l2input_get_feat_names (void)
62 return l2input_feat_names;
66 format_l2_input_features (u8 * s, va_list * args)
68 static char *display_names[] = {
69 #define _(sym,name) #sym,
73 u32 feature_bitmap = va_arg (*args, u32);
75 if (feature_bitmap == 0)
77 s = format (s, " none configured");
81 feature_bitmap &= ~L2INPUT_FEAT_DROP; /* Not a feature */
83 for (i = L2INPUT_N_FEAT; i >= 0; i--)
84 if (feature_bitmap & (1 << i))
85 s = format (s, "%10s (%s)\n", display_names[i], l2input_feat_names[i]);
91 /* per-pkt trace data */
98 /* packet trace format function */
100 format_l2input_trace (u8 * s, va_list * args)
102 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
103 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
104 l2input_trace_t *t = va_arg (*args, l2input_trace_t *);
106 s = format (s, "l2-input: sw_if_index %d dst %U src %U",
108 format_ethernet_address, t->dst,
109 format_ethernet_address, t->src);
113 l2input_main_t l2input_main;
115 #define foreach_l2input_error \
116 _(L2INPUT, "L2 input packets") \
117 _(DROP, "L2 input drops")
121 #define _(sym,str) L2INPUT_ERROR_##sym,
122 foreach_l2input_error
127 static char *l2input_error_strings[] = {
128 #define _(sym,string) string,
129 foreach_l2input_error
142 static_always_inline void
143 classify_and_dispatch (l2input_main_t * msm, vlib_buffer_t * b0, u32 * next0)
146 * Load L2 input feature struct
147 * Load bridge domain struct
148 * Parse ethernet header to determine unicast/mcast/broadcast
150 * classify packet as IP/UDP/TCP, control, other
151 * mask feature bitmap
152 * go to first node in bitmap
153 * Later: optimize VTM
156 * set tx sw-if-handle
161 l2_input_config_t *config;
162 l2_bridge_domain_t *bd_config;
166 ethernet_header_t *h0;
170 #define get_u16(addr) ( *((u16 *)(addr)) )
172 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
174 h0 = vlib_buffer_get_current (b0);
175 l3h0 = (u8 *) h0 + vnet_buffer (b0)->l2.l2_len;
177 ethertype = clib_net_to_host_u16 (get_u16 (l3h0 - 2));
180 /* Get config for the input interface */
181 config = vec_elt_at_index (msm->configs, sw_if_index0);
183 /* Save split horizon group */
184 vnet_buffer (b0)->l2.shg = config->shg;
186 /* determine layer2 kind for stat and mask */
187 if (PREDICT_FALSE (ethernet_address_cast (h0->dst_address)))
189 protocol = ((ip6_header_t *) l3h0)->protocol;
191 /* Disable bridge forwarding (flooding will execute instead if not xconnect) */
192 feat_mask &= ~(L2INPUT_FEAT_FWD | L2INPUT_FEAT_UU_FLOOD);
194 /* Disable ARP-term for non-ARP and non-ICMP6 packet */
195 if (ethertype != ETHERNET_TYPE_ARP &&
196 (ethertype != ETHERNET_TYPE_IP6 || protocol != IP_PROTOCOL_ICMP6))
197 feat_mask &= ~(L2INPUT_FEAT_ARP_TERM);
200 * For packet from BVI - set SHG of ARP request or ICMPv6 neighbor
201 * solicitation packet from BVI to 0 so it can also flood to VXLAN
202 * tunnels or other ports with the same SHG as that of the BVI.
204 else if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
207 if (ethertype == ETHERNET_TYPE_ARP)
209 ethernet_arp_header_t *arp0 = (ethernet_arp_header_t *) l3h0;
211 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request))
212 vnet_buffer (b0)->l2.shg = 0;
214 else /* must be ICMPv6 */
216 ip6_header_t *iph0 = (ip6_header_t *) l3h0;
217 icmp6_neighbor_solicitation_or_advertisement_header_t *ndh0;
218 ndh0 = ip6_next_header (iph0);
219 if (ndh0->icmp.type == ICMP6_neighbor_solicitation)
220 vnet_buffer (b0)->l2.shg = 0;
227 * For packet from BVI - set SHG of unicast packet from BVI to 0 so it
228 * is not dropped on output to VXLAN tunnels or other ports with the
229 * same SHG as that of the BVI.
231 if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
233 vnet_buffer (b0)->l2.shg = 0;
239 /* Do bridge-domain processing */
240 bd_index0 = config->bd_index;
241 /* save BD ID for next feature graph nodes */
242 vnet_buffer (b0)->l2.bd_index = bd_index0;
244 /* Get config for the bridge domain interface */
245 bd_config = vec_elt_at_index (msm->bd_configs, bd_index0);
247 /* Save bridge domain and interface seq_num */
249 l2fib_seq_num_t sn = {
250 .swif = *l2fib_swif_seq_num(sw_if_index0),
251 .bd = bd_config->seq_num,
254 vnet_buffer (b0)->l2.l2fib_sn = sn.as_u16;;
255 vnet_buffer (b0)->l2.bd_age = bd_config->mac_age;
258 * Process bridge domain feature enables.
259 * To perform learning/flooding/forwarding, the corresponding bit
260 * must be enabled in both the input interface config and in the
261 * bridge domain config. In the bd_bitmap, bits for features other
262 * than learning/flooding/forwarding should always be set.
264 feat_mask = feat_mask & bd_config->feature_bitmap;
266 else if (config->xconnect)
268 /* Set the output interface */
269 vnet_buffer (b0)->sw_if_index[VLIB_TX] = config->output_sw_if_index;
272 feat_mask = L2INPUT_FEAT_DROP;
274 /* mask out features from bitmap using packet type and bd config */
275 feature_bitmap = config->feature_bitmap & feat_mask;
277 /* save for next feature graph nodes */
278 vnet_buffer (b0)->l2.feature_bitmap = feature_bitmap;
280 /* Determine the next node */
281 *next0 = feat_bitmap_get_next_node_index (msm->feat_next_node_index,
285 static_always_inline uword
286 l2input_node_inline (vlib_main_t * vm,
287 vlib_node_runtime_t * node, vlib_frame_t * frame,
290 u32 n_left_from, *from, *to_next;
291 l2input_next_t next_index;
292 l2input_main_t *msm = &l2input_main;
294 from = vlib_frame_vector_args (frame);
295 n_left_from = frame->n_vectors; /* number of packets to process */
296 next_index = node->cached_next_index;
298 while (n_left_from > 0)
302 /* get space to enqueue frame to graph node "next_index" */
303 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
305 while (n_left_from >= 8 && n_left_to_next >= 4)
307 u32 bi0, bi1, bi2, bi3;
308 vlib_buffer_t *b0, *b1, *b2, *b3;
309 u32 next0, next1, next2, next3;
310 u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
312 /* Prefetch next iteration. */
314 vlib_buffer_t *p4, *p5, *p6, *p7;
316 p4 = vlib_get_buffer (vm, from[4]);
317 p5 = vlib_get_buffer (vm, from[5]);
318 p6 = vlib_get_buffer (vm, from[6]);
319 p7 = vlib_get_buffer (vm, from[7]);
321 /* Prefetch the buffer header and packet for the N+2 loop iteration */
322 vlib_prefetch_buffer_header (p4, LOAD);
323 vlib_prefetch_buffer_header (p5, LOAD);
324 vlib_prefetch_buffer_header (p6, LOAD);
325 vlib_prefetch_buffer_header (p7, LOAD);
327 CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
328 CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
329 CLIB_PREFETCH (p6->data, CLIB_CACHE_LINE_BYTES, STORE);
330 CLIB_PREFETCH (p7->data, CLIB_CACHE_LINE_BYTES, STORE);
333 * Don't bother prefetching the bridge-domain config (which
334 * depends on the input config above). Only a small number of
335 * bridge domains are expected. Plus the structure is small
336 * and several fit in a cache line.
340 /* speculatively enqueue b0 and b1 to the current next frame */
341 /* bi is "buffer index", b is pointer to the buffer */
342 to_next[0] = bi0 = from[0];
343 to_next[1] = bi1 = from[1];
344 to_next[2] = bi2 = from[2];
345 to_next[3] = bi3 = from[3];
351 b0 = vlib_get_buffer (vm, bi0);
352 b1 = vlib_get_buffer (vm, bi1);
353 b2 = vlib_get_buffer (vm, bi2);
354 b3 = vlib_get_buffer (vm, bi3);
358 /* RX interface handles */
359 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
360 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
361 sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX];
362 sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX];
364 if (b0->flags & VLIB_BUFFER_IS_TRACED)
366 ethernet_header_t *h0 = vlib_buffer_get_current (b0);
368 vlib_add_trace (vm, node, b0, sizeof (*t));
369 t->sw_if_index = sw_if_index0;
370 clib_memcpy (t->src, h0->src_address, 6);
371 clib_memcpy (t->dst, h0->dst_address, 6);
373 if (b1->flags & VLIB_BUFFER_IS_TRACED)
375 ethernet_header_t *h1 = vlib_buffer_get_current (b1);
377 vlib_add_trace (vm, node, b1, sizeof (*t));
378 t->sw_if_index = sw_if_index1;
379 clib_memcpy (t->src, h1->src_address, 6);
380 clib_memcpy (t->dst, h1->dst_address, 6);
382 if (b2->flags & VLIB_BUFFER_IS_TRACED)
384 ethernet_header_t *h2 = vlib_buffer_get_current (b2);
386 vlib_add_trace (vm, node, b2, sizeof (*t));
387 t->sw_if_index = sw_if_index2;
388 clib_memcpy (t->src, h2->src_address, 6);
389 clib_memcpy (t->dst, h2->dst_address, 6);
391 if (b3->flags & VLIB_BUFFER_IS_TRACED)
393 ethernet_header_t *h3 = vlib_buffer_get_current (b3);
395 vlib_add_trace (vm, node, b3, sizeof (*t));
396 t->sw_if_index = sw_if_index3;
397 clib_memcpy (t->src, h3->src_address, 6);
398 clib_memcpy (t->dst, h3->dst_address, 6);
402 vlib_node_increment_counter (vm, l2input_node.index,
403 L2INPUT_ERROR_L2INPUT, 4);
405 classify_and_dispatch (msm, b0, &next0);
406 classify_and_dispatch (msm, b1, &next1);
407 classify_and_dispatch (msm, b2, &next2);
408 classify_and_dispatch (msm, b3, &next3);
410 /* verify speculative enqueues, maybe switch current next frame */
411 /* if next0==next1==next_index then nothing special needs to be done */
412 vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
413 to_next, n_left_to_next,
415 next0, next1, next2, next3);
418 while (n_left_from > 0 && n_left_to_next > 0)
425 /* speculatively enqueue b0 to the current next frame */
433 b0 = vlib_get_buffer (vm, bi0);
435 if (do_trace && PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
437 ethernet_header_t *h0 = vlib_buffer_get_current (b0);
438 l2input_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
439 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
440 t->sw_if_index = sw_if_index0;
441 clib_memcpy (t->src, h0->src_address, 6);
442 clib_memcpy (t->dst, h0->dst_address, 6);
445 vlib_node_increment_counter (vm, l2input_node.index,
446 L2INPUT_ERROR_L2INPUT, 1);
448 classify_and_dispatch (msm, b0, &next0);
450 /* verify speculative enqueue, maybe switch current next frame */
451 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
452 to_next, n_left_to_next,
456 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
459 return frame->n_vectors;
463 l2input_node_fn (vlib_main_t * vm,
464 vlib_node_runtime_t * node, vlib_frame_t * frame)
466 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
467 return l2input_node_inline (vm, node, frame, 1 /* do_trace */ );
468 return l2input_node_inline (vm, node, frame, 0 /* do_trace */ );
472 VLIB_REGISTER_NODE (l2input_node) = {
473 .function = l2input_node_fn,
475 .vector_size = sizeof (u32),
476 .format_trace = format_l2input_trace,
477 .format_buffer = format_ethernet_header_with_length,
478 .type = VLIB_NODE_TYPE_INTERNAL,
480 .n_errors = ARRAY_LEN(l2input_error_strings),
481 .error_strings = l2input_error_strings,
483 .n_next_nodes = L2INPUT_N_NEXT,
485 /* edit / add dispositions here */
487 [L2INPUT_NEXT_LEARN] = "l2-learn",
488 [L2INPUT_NEXT_FWD] = "l2-fwd",
489 [L2INPUT_NEXT_DROP] = "error-drop",
494 VLIB_NODE_FUNCTION_MULTIARCH (l2input_node, l2input_node_fn)
495 clib_error_t *l2input_init (vlib_main_t * vm)
497 l2input_main_t *mp = &l2input_main;
500 mp->vnet_main = vnet_get_main ();
502 /* Get packets RX'd from L2 interfaces */
503 ethernet_register_l2_input (vm, l2input_node.index);
505 /* Create the config vector */
506 vec_validate (mp->configs, 100);
507 /* create 100 sw interface entries and zero them */
509 /* Initialize the feature next-node indexes */
510 feat_bitmap_init_next_nodes (vm,
513 l2input_get_feat_names (),
514 mp->feat_next_node_index);
519 VLIB_INIT_FUNCTION (l2input_init);
522 /** Get a pointer to the config for the given interface. */
524 l2input_intf_config (u32 sw_if_index)
526 l2input_main_t *mp = &l2input_main;
528 vec_validate (mp->configs, sw_if_index);
529 return vec_elt_at_index (mp->configs, sw_if_index);
532 /** Enable (or disable) the feature in the bitmap for the given interface. */
534 l2input_intf_bitmap_enable (u32 sw_if_index, u32 feature_bitmap, u32 enable)
536 l2_input_config_t *config = l2input_intf_config (sw_if_index);
539 config->feature_bitmap |= feature_bitmap;
541 config->feature_bitmap &= ~feature_bitmap;
543 return config->feature_bitmap;
547 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value)
549 l2_bridge_domain_t *bd_config = l2input_bd_config (bd_index);;
550 bd_validate (bd_config);
551 bd_config->feature_bitmap =
552 (bd_config->feature_bitmap & ~feat_mask) | feat_value;
553 return bd_config->feature_bitmap;
557 * Set the subinterface to run in l2 or l3 mode.
558 * For L3 mode, just the sw_if_index is specified.
559 * For bridged mode, the bd id and bvi flag are also specified.
560 * For xconnect mode, the peer sw_if_index is also specified.
561 * Return 0 if ok, or non-0 if there was an error.
565 set_int_l2_mode (vlib_main_t * vm, vnet_main_t * vnet_main, /* */
566 u32 mode, /* One of L2 modes or back to L3 mode */
567 u32 sw_if_index, /* sw interface index */
568 u32 bd_index, /* for bridged interface */
569 u32 bvi, /* the bridged interface is the BVI */
570 u32 shg, /* the bridged interface split horizon group */
571 u32 xc_sw_if_index) /* peer interface for xconnect */
573 l2input_main_t *mp = &l2input_main;
574 l2output_main_t *l2om = &l2output_main;
575 vnet_main_t *vnm = vnet_get_main ();
576 vnet_hw_interface_t *hi;
577 l2_output_config_t *out_config;
578 l2_input_config_t *config;
579 l2_bridge_domain_t *bd_config;
580 i32 l2_if_adjust = 0;
583 hi = vnet_get_sup_hw_interface (vnet_main, sw_if_index);
584 config = l2input_intf_config (sw_if_index);
588 /* Interface is already in bridge mode. Undo the existing config. */
589 bd_config = vec_elt_at_index (mp->bd_configs, config->bd_index);
591 /* remove interface from flood vector */
592 bd_remove_member (bd_config, sw_if_index);
594 /* undo any BVI-related config */
595 if (bd_config->bvi_sw_if_index == sw_if_index)
597 bd_config->bvi_sw_if_index = ~0;
600 /* delete the l2fib entry for the bvi interface */
601 l2fib_del_entry (hi->hw_address, config->bd_index);
603 /* Make loop output node send packet back to ethernet-input node */
605 vlib_node_add_named_next_with_slot (vm, hi->tx_node_index,
607 VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
608 ASSERT (slot == VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
611 /* Clear MACs learned on the interface */
612 if ((config->feature_bitmap & L2INPUT_FEAT_LEARN) ||
613 (bd_config->feature_bitmap & L2INPUT_FEAT_LEARN))
614 l2fib_flush_int_mac (vm, sw_if_index);
618 else if (config->xconnect)
623 /* Make sure vector is big enough */
624 vec_validate_init_empty (l2om->output_node_index_vec, sw_if_index,
627 /* Initialize the l2-input configuration for the interface */
630 /* Set L2 config to BD index 0 so that if any packet accidentally
631 * came in on L2 path, it will be dropped in BD 0 */
632 config->xconnect = 0;
635 config->bd_index = 0;
636 config->feature_bitmap = L2INPUT_FEAT_DROP;
638 /* Clear L2 output config */
639 out_config = l2output_intf_config (sw_if_index);
640 memset (out_config, 0, sizeof (l2_output_config_t));
642 /* Make sure any L2-output packet to this interface now in L3 mode is
643 * dropped. This may happen if L2 FIB MAC entry is stale */
644 l2om->output_node_index_vec[sw_if_index] = L2OUTPUT_NEXT_BAD_INTF;
648 /* Add or update l2-output node next-arc and output_node_index_vec table
649 * for the interface */
650 l2output_create_output_node_mapping (vm, vnet_main, sw_if_index);
652 if (mode == MODE_L2_BRIDGE)
655 * Remove a check that the interface must be an Ethernet.
656 * Specifically so we can bridge to L3 tunnel interfaces.
658 * if (hi->hw_class_index != ethernet_hw_interface_class.index)
662 return MODE_ERROR_ETH; /* non-ethernet */
664 config->xconnect = 0;
666 config->bd_index = bd_index;
667 *l2fib_valid_swif_seq_num (sw_if_index) += 1;
670 * Enable forwarding, flooding, learning and ARP termination by default
671 * (note that ARP term is disabled on BD feature bitmap by default)
673 config->feature_bitmap |= L2INPUT_FEAT_FWD | L2INPUT_FEAT_UU_FLOOD |
674 L2INPUT_FEAT_FLOOD | L2INPUT_FEAT_LEARN | L2INPUT_FEAT_ARP_TERM;
676 /* Make sure last-chance drop is configured */
677 config->feature_bitmap |= L2INPUT_FEAT_DROP;
679 /* Make sure xconnect is disabled */
680 config->feature_bitmap &= ~L2INPUT_FEAT_XCONNECT;
682 /* Set up bridge domain */
683 bd_config = l2input_bd_config (bd_index);
684 bd_validate (bd_config);
686 /* TODO: think: add l2fib entry even for non-bvi interface? */
688 /* Do BVI interface initializations */
691 /* ensure BD has no bvi interface (or replace that one with this??) */
692 if (bd_config->bvi_sw_if_index != ~0)
694 return MODE_ERROR_BVI_DEF; /* bd already has a bvi interface */
696 bd_config->bvi_sw_if_index = sw_if_index;
699 /* create the l2fib entry for the bvi interface */
700 l2fib_add_fwd_entry (hi->hw_address, bd_index, sw_if_index, 1, 1); /* static + bvi */
702 /* Disable learning by default. no use since l2fib entry is static. */
703 config->feature_bitmap &= ~L2INPUT_FEAT_LEARN;
705 /* Make loop output node send packet to l2-input node */
707 vlib_node_add_named_next_with_slot (vm, hi->tx_node_index,
709 VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
710 ASSERT (slot == VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
713 /* Add interface to bridge-domain flood vector */
714 l2_flood_member_t member = {
715 .sw_if_index = sw_if_index,
716 .flags = bvi ? L2_FLOOD_MEMBER_BVI : L2_FLOOD_MEMBER_NORMAL,
719 bd_add_member (bd_config, &member);
722 else if (mode == MODE_L2_XC)
724 config->xconnect = 1;
726 config->output_sw_if_index = xc_sw_if_index;
728 /* Make sure last-chance drop is configured */
729 config->feature_bitmap |= L2INPUT_FEAT_DROP;
731 /* Make sure bridging features are disabled */
732 config->feature_bitmap &=
733 ~(L2INPUT_FEAT_LEARN | L2INPUT_FEAT_FWD | L2INPUT_FEAT_FLOOD);
735 config->feature_bitmap |= L2INPUT_FEAT_XCONNECT;
736 shg = 0; /* not used in xconnect */
738 else if (mode == MODE_L2_CLASSIFY)
740 config->xconnect = 1;
742 config->output_sw_if_index = xc_sw_if_index;
744 /* Make sure last-chance drop is configured */
745 config->feature_bitmap |=
746 L2INPUT_FEAT_DROP | L2INPUT_FEAT_INPUT_CLASSIFY;
748 /* Make sure bridging features are disabled */
749 config->feature_bitmap &=
750 ~(L2INPUT_FEAT_LEARN | L2INPUT_FEAT_FWD | L2INPUT_FEAT_FLOOD);
751 shg = 0; /* not used in xconnect */
753 /* Insure all packets go to ethernet-input */
754 ethernet_set_rx_redirect (vnet_main, hi, 1);
757 /* set up split-horizon group and set output feature bit */
759 out_config = l2output_intf_config (sw_if_index);
760 out_config->shg = shg;
761 out_config->feature_bitmap |= L2OUTPUT_FEAT_OUTPUT;
764 * Test: remove this when non-IP features can be configured.
765 * Enable a non-IP feature to test IP feature masking
766 * config->feature_bitmap |= L2INPUT_FEAT_CTRL_PKT;
772 /* Adjust count of L2 interfaces */
773 hi->l2_if_count += l2_if_adjust;
775 if (hi->hw_class_index == ethernet_hw_interface_class.index)
777 if ((hi->l2_if_count == 1) && (l2_if_adjust == 1))
779 /* Just added first L2 interface on this port */
781 /* Set promiscuous mode on the l2 interface */
782 ethernet_set_flags (vnet_main, hi->hw_if_index,
783 ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);
785 /* ensure all packets go to ethernet-input */
786 ethernet_set_rx_redirect (vnet_main, hi, 1);
789 else if ((hi->l2_if_count == 0) && (l2_if_adjust == -1))
791 /* Just removed only L2 subinterface on this port */
793 /* Disable promiscuous mode on the l2 interface */
794 ethernet_set_flags (vnet_main, hi->hw_if_index, 0);
796 /* Allow ip packets to go directly to ip4-input etc */
797 ethernet_set_rx_redirect (vnet_main, hi, 0);
801 /* Set up the L2/L3 flag in the interface parsing tables */
802 ethernet_sw_interface_set_l2_mode (vnm, sw_if_index, (mode != MODE_L3));
808 * Set subinterface in bridging mode with a bridge-domain ID.
810 * set interface l2 bridge <interface> <bd> [bvi] [split-horizon-group]
812 static clib_error_t *
813 int_l2_bridge (vlib_main_t * vm,
814 unformat_input_t * input, vlib_cli_command_t * cmd)
816 vnet_main_t *vnm = vnet_get_main ();
817 clib_error_t *error = 0;
824 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
826 error = clib_error_return (0, "unknown interface `%U'",
827 format_unformat_error, input);
831 if (!unformat (input, "%d", &bd_id))
833 error = clib_error_return (0, "expected bridge domain ID `%U'",
834 format_unformat_error, input);
838 if (bd_id > L2_BD_ID_MAX)
840 error = clib_error_return (0, "bridge domain ID exceed 16M limit",
841 format_unformat_error, input);
844 bd_index = bd_find_or_add_bd_index (&bd_main, bd_id);
847 bvi = unformat (input, "bvi");
849 /* optional split horizon group */
851 (void) unformat (input, "%d", &shg);
853 /* set the interface mode */
855 set_int_l2_mode (vm, vnm, MODE_L2_BRIDGE, sw_if_index, bd_index, bvi,
858 if (rc == MODE_ERROR_ETH)
860 error = clib_error_return (0, "bridged interface must be ethernet",
861 format_unformat_error, input);
863 else if (rc == MODE_ERROR_BVI_DEF)
866 clib_error_return (0, "bridge-domain already has a bvi interface",
867 format_unformat_error, input);
871 error = clib_error_return (0, "invalid configuration for interface",
872 format_unformat_error, input);
882 * Use this command put an interface into Layer 2 bridge domain. If a
883 * bridge-domain with the provided bridge-domain-id does not exist, it
884 * will be created. Interfaces in a bridge-domain forward packets to
885 * other interfaces in the same bridge-domain based on destination mac
886 * address. To remove an interface from a the Layer 2 bridge domain,
887 * put the interface in a different mode, for example Layer 3 mode.
889 * Optionally, an interface can be added to a Layer 2 bridge-domain as
890 * a Bridged Virtual Interface (bvi). Only one interface in a Layer 2
891 * bridge-domain can be a bvi.
893 * Optionally, a split-horizon group can also be specified. This defaults
894 * to 0 if not specified.
897 * Example of how to configure a Layer 2 bridge-domain with three
898 * interfaces (where 200 is the bridge-domain-id):
899 * @cliexcmd{set interface l2 bridge GigabitEthernet0/8/0.200 200}
900 * This interface is added a BVI interface:
901 * @cliexcmd{set interface l2 bridge GigabitEthernet0/9/0.200 200 bvi}
902 * This interface also has a split-horizon group of 1 specified:
903 * @cliexcmd{set interface l2 bridge GigabitEthernet0/a/0.200 200 1}
904 * Example of how to remove an interface from a Layer2 bridge-domain:
905 * @cliexcmd{set interface l3 GigabitEthernet0/a/0.200}
908 VLIB_CLI_COMMAND (int_l2_bridge_cli, static) = {
909 .path = "set interface l2 bridge",
910 .short_help = "set interface l2 bridge <interface> <bridge-domain-id> [bvi] [shg]",
911 .function = int_l2_bridge,
916 * Set subinterface in xconnect mode with another interface.
918 * set interface l2 xconnect <interface> <peer interface>
920 static clib_error_t *
921 int_l2_xc (vlib_main_t * vm,
922 unformat_input_t * input, vlib_cli_command_t * cmd)
924 vnet_main_t *vnm = vnet_get_main ();
925 clib_error_t *error = 0;
929 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
931 error = clib_error_return (0, "unknown interface `%U'",
932 format_unformat_error, input);
937 (input, unformat_vnet_sw_interface, vnm, &xc_sw_if_index))
939 error = clib_error_return (0, "unknown peer interface `%U'",
940 format_unformat_error, input);
944 /* set the interface mode */
946 (vm, vnm, MODE_L2_XC, sw_if_index, 0, 0, 0, xc_sw_if_index))
948 error = clib_error_return (0, "invalid configuration for interface",
949 format_unformat_error, input);
958 * Use this command put an interface into Layer 2 cross-connect mode.
959 * Both interfaces must be in this mode for bi-directioal traffic. All
960 * packets received on one interface will be transmitted to the other.
961 * To remove the Layer 2 cross-connect, put the interface in a different
962 * mode, for example Layer 3 mode.
965 * Example of how to configure a Layer2 cross-connect between two interfaces:
966 * @cliexcmd{set interface l2 xconnect GigabitEthernet0/8/0.300 GigabitEthernet0/9/0.300}
967 * @cliexcmd{set interface l2 xconnect GigabitEthernet0/9/0.300 GigabitEthernet0/8/0.300}
968 * Example of how to remove a Layer2 cross-connect:
969 * @cliexcmd{set interface l3 GigabitEthernet0/8/0.300}
970 * @cliexcmd{set interface l3 GigabitEthernet0/9/0.300}
973 VLIB_CLI_COMMAND (int_l2_xc_cli, static) = {
974 .path = "set interface l2 xconnect",
975 .short_help = "set interface l2 xconnect <interface> <peer interface>",
976 .function = int_l2_xc,
981 * Set subinterface in L3 mode.
983 * set interface l3 <interface>
985 static clib_error_t *
986 int_l3 (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd)
988 vnet_main_t *vnm = vnet_get_main ();
989 clib_error_t *error = 0;
992 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
994 error = clib_error_return (0, "unknown interface `%U'",
995 format_unformat_error, input);
999 /* set the interface mode */
1000 if (set_int_l2_mode (vm, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0))
1002 error = clib_error_return (0, "invalid configuration for interface",
1003 format_unformat_error, input);
1012 * Modify the packet processing mode of the interface to Layer 3, which
1013 * implies packets will be routed. This is the default mode of an interface.
1014 * Use this command to remove an interface from a Layer 2 cross-connect or a
1018 * Example of how to set the mode of an interface to Layer 3:
1019 * @cliexcmd{set interface l3 GigabitEthernet0/8/0.200}
1022 VLIB_CLI_COMMAND (int_l3_cli, static) = {
1023 .path = "set interface l3",
1024 .short_help = "set interface l3 <interface>",
1030 * Show interface mode.
1031 * The CLI format is:
1032 * show mode [<if-name1> <if-name2> ...]
1034 static clib_error_t *
1035 show_int_mode (vlib_main_t * vm,
1036 unformat_input_t * input, vlib_cli_command_t * cmd)
1038 vnet_main_t *vnm = vnet_get_main ();
1039 clib_error_t *error = 0;
1042 vnet_interface_main_t *im = &vnm->interface_main;
1044 vnet_sw_interface_t *si, *sis = 0;
1045 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1049 /* See if user wants to show specific interface */
1051 (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
1053 si = pool_elt_at_index (im->sw_interfaces, sw_if_index);
1054 vec_add1 (sis, si[0]);
1058 error = clib_error_return (0, "unknown input `%U'",
1059 format_unformat_error, input);
1064 if (vec_len (sis) == 0) /* Get all interfaces */
1066 /* Gather interfaces. */
1067 sis = vec_new (vnet_sw_interface_t, pool_elts (im->sw_interfaces));
1070 pool_foreach (si, im->sw_interfaces, ({ vec_add1 (sis, si[0]); }));
1074 vec_foreach (si, sis)
1076 l2_input_config_t *config = l2input_intf_config (si->sw_if_index);
1081 bd_id = l2input_main.bd_configs[config->bd_index].bd_id;
1083 args = format (0, "bd_id %d%s%d", bd_id,
1084 config->bvi ? " bvi shg " : " shg ", config->shg);
1086 else if (config->xconnect)
1088 mode = "l2 xconnect";
1089 args = format (0, "%U",
1090 format_vnet_sw_if_index_name,
1091 vnm, config->output_sw_if_index);
1096 args = format (0, " ");
1098 vlib_cli_output (vm, "%s %U %v\n",
1100 format_vnet_sw_if_index_name,
1101 vnm, si->sw_if_index, args);
1112 * Show the packet processing mode (Layer2 xcross-onnect, Layer 2 bridge,
1113 * Layer 3 routed) of all interfaces and sub-interfaces, or limit the
1114 * output to just the provided list of interfaces and sub-interfaces.
1115 * The output shows the mode, the interface, and if the interface is
1116 * a member of a bridge, the bridge-domain-id and the split horizen group (shg).
1119 * Example of displaying the mode of all interfaces:
1120 * @cliexstart{show mode}
1122 * l3 GigabitEthernet0/8/0
1123 * l3 GigabitEthernet0/9/0
1124 * l3 GigabitEthernet0/a/0
1125 * l2 bridge GigabitEthernet0/8/0.200 bd_id 200 shg 0
1126 * l2 bridge GigabitEthernet0/9/0.200 bd_id 200 shg 0
1127 * l2 bridge GigabitEthernet0/a/0.200 bd_id 200 shg 0
1128 * l2 xconnect GigabitEthernet0/8/0.300 GigabitEthernet0/9/0.300
1129 * l2 xconnect GigabitEthernet0/9/0.300 GigabitEthernet0/8/0.300
1131 * Example of displaying the mode of a seleted list of interfaces:
1132 * @cliexstart{show mode GigabitEthernet0/8/0 GigabitEthernet0/8/0.200}
1133 * l3 GigabitEthernet0/8/0
1134 * l2 bridge GigabitEthernet0/8/0.200 bd_id 200 shg 0
1138 VLIB_CLI_COMMAND (show_l2_mode, static) = {
1139 .path = "show mode",
1140 .short_help = "show mode [<if-name1> <if-name2> ...]",
1141 .function = show_int_mode,
1145 #define foreach_l2_init_function \
1146 _(feat_bitmap_drop_init) \
1148 _(l2_input_classify_init) \
1155 _(l2_efp_filter_init) \
1164 l2_init (vlib_main_t * vm)
1166 clib_error_t *error;
1169 if ((error = vlib_call_init_function (vm, a))) return error; } \
1171 foreach_l2_init_function;
1176 VLIB_INIT_FUNCTION (l2_init);
1179 * fd.io coding-style-patch-verification: ON
1182 * eval: (c-set-style "gnu")