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
160 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
161 ethernet_header_t *h0 = vlib_buffer_get_current (b0);
163 /* Get config for the input interface */
164 l2_input_config_t *config = vec_elt_at_index (msm->configs, sw_if_index0);
166 /* Save split horizon group */
167 vnet_buffer (b0)->l2.shg = config->shg;
169 /* determine layer2 kind for stat and mask */
170 if (PREDICT_FALSE (ethernet_address_cast (h0->dst_address)))
172 u8 *l3h0 = (u8 *) h0 + vnet_buffer (b0)->l2.l2_len;
174 #define get_u16(addr) ( *((u16 *)(addr)) )
175 u16 ethertype = clib_net_to_host_u16 (get_u16 (l3h0 - 2));
176 u8 protocol = ((ip6_header_t *) l3h0)->protocol;
178 /* Disable bridge forwarding (flooding will execute instead if not xconnect) */
179 feat_mask &= ~(L2INPUT_FEAT_FWD | L2INPUT_FEAT_UU_FLOOD);
181 /* Disable ARP-term for non-ARP and non-ICMP6 packet */
182 if (ethertype != ETHERNET_TYPE_ARP &&
183 (ethertype != ETHERNET_TYPE_IP6 || protocol != IP_PROTOCOL_ICMP6))
184 feat_mask &= ~(L2INPUT_FEAT_ARP_TERM);
187 * For packet from BVI - set SHG of ARP request or ICMPv6 neighbor
188 * solicitation packet from BVI to 0 so it can also flood to VXLAN
189 * tunnels or other ports with the same SHG as that of the BVI.
191 else if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
194 if (ethertype == ETHERNET_TYPE_ARP)
196 ethernet_arp_header_t *arp0 = (ethernet_arp_header_t *) l3h0;
198 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request))
199 vnet_buffer (b0)->l2.shg = 0;
201 else /* must be ICMPv6 */
203 ip6_header_t *iph0 = (ip6_header_t *) l3h0;
204 icmp6_neighbor_solicitation_or_advertisement_header_t *ndh0;
205 ndh0 = ip6_next_header (iph0);
206 if (ndh0->icmp.type == ICMP6_neighbor_solicitation)
207 vnet_buffer (b0)->l2.shg = 0;
214 * For packet from BVI - set SHG of unicast packet from BVI to 0 so it
215 * is not dropped on output to VXLAN tunnels or other ports with the
216 * same SHG as that of the BVI.
218 if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
220 vnet_buffer (b0)->l2.shg = 0;
226 /* Do bridge-domain processing */
227 u16 bd_index0 = config->bd_index;
228 /* save BD ID for next feature graph nodes */
229 vnet_buffer (b0)->l2.bd_index = bd_index0;
231 /* Get config for the bridge domain interface */
232 l2_bridge_domain_t *bd_config =
233 vec_elt_at_index (msm->bd_configs, bd_index0);
235 /* Save bridge domain and interface seq_num */
237 l2fib_seq_num_t sn = {
238 .swif = *l2fib_swif_seq_num(sw_if_index0),
239 .bd = bd_config->seq_num,
242 vnet_buffer (b0)->l2.l2fib_sn = sn.as_u16;;
243 vnet_buffer (b0)->l2.bd_age = bd_config->mac_age;
246 * Process bridge domain feature enables.
247 * To perform learning/flooding/forwarding, the corresponding bit
248 * must be enabled in both the input interface config and in the
249 * bridge domain config. In the bd_bitmap, bits for features other
250 * than learning/flooding/forwarding should always be set.
252 feat_mask = feat_mask & bd_config->feature_bitmap;
254 else if (config->xconnect)
256 /* Set the output interface */
257 vnet_buffer (b0)->sw_if_index[VLIB_TX] = config->output_sw_if_index;
260 feat_mask = L2INPUT_FEAT_DROP;
262 /* mask out features from bitmap using packet type and bd config */
263 u32 feature_bitmap = config->feature_bitmap & feat_mask;
265 /* save for next feature graph nodes */
266 vnet_buffer (b0)->l2.feature_bitmap = feature_bitmap;
268 /* Determine the next node */
269 *next0 = feat_bitmap_get_next_node_index (msm->feat_next_node_index,
273 static_always_inline uword
274 l2input_node_inline (vlib_main_t * vm,
275 vlib_node_runtime_t * node, vlib_frame_t * frame,
278 u32 n_left_from, *from, *to_next;
279 l2input_next_t next_index;
280 l2input_main_t *msm = &l2input_main;
282 from = vlib_frame_vector_args (frame);
283 n_left_from = frame->n_vectors; /* number of packets to process */
284 next_index = node->cached_next_index;
286 while (n_left_from > 0)
290 /* get space to enqueue frame to graph node "next_index" */
291 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
293 while (n_left_from >= 8 && n_left_to_next >= 4)
295 u32 bi0, bi1, bi2, bi3;
296 vlib_buffer_t *b0, *b1, *b2, *b3;
297 u32 next0, next1, next2, next3;
298 u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
300 /* Prefetch next iteration. */
302 vlib_buffer_t *p4, *p5, *p6, *p7;
304 p4 = vlib_get_buffer (vm, from[4]);
305 p5 = vlib_get_buffer (vm, from[5]);
306 p6 = vlib_get_buffer (vm, from[6]);
307 p7 = vlib_get_buffer (vm, from[7]);
309 /* Prefetch the buffer header and packet for the N+2 loop iteration */
310 vlib_prefetch_buffer_header (p4, LOAD);
311 vlib_prefetch_buffer_header (p5, LOAD);
312 vlib_prefetch_buffer_header (p6, LOAD);
313 vlib_prefetch_buffer_header (p7, LOAD);
315 CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
316 CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
317 CLIB_PREFETCH (p6->data, CLIB_CACHE_LINE_BYTES, STORE);
318 CLIB_PREFETCH (p7->data, CLIB_CACHE_LINE_BYTES, STORE);
321 * Don't bother prefetching the bridge-domain config (which
322 * depends on the input config above). Only a small number of
323 * bridge domains are expected. Plus the structure is small
324 * and several fit in a cache line.
328 /* speculatively enqueue b0 and b1 to the current next frame */
329 /* bi is "buffer index", b is pointer to the buffer */
330 to_next[0] = bi0 = from[0];
331 to_next[1] = bi1 = from[1];
332 to_next[2] = bi2 = from[2];
333 to_next[3] = bi3 = from[3];
339 b0 = vlib_get_buffer (vm, bi0);
340 b1 = vlib_get_buffer (vm, bi1);
341 b2 = vlib_get_buffer (vm, bi2);
342 b3 = vlib_get_buffer (vm, bi3);
346 /* RX interface handles */
347 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
348 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
349 sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX];
350 sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX];
352 if (b0->flags & VLIB_BUFFER_IS_TRACED)
354 ethernet_header_t *h0 = vlib_buffer_get_current (b0);
356 vlib_add_trace (vm, node, b0, sizeof (*t));
357 t->sw_if_index = sw_if_index0;
358 clib_memcpy (t->src, h0->src_address, 6);
359 clib_memcpy (t->dst, h0->dst_address, 6);
361 if (b1->flags & VLIB_BUFFER_IS_TRACED)
363 ethernet_header_t *h1 = vlib_buffer_get_current (b1);
365 vlib_add_trace (vm, node, b1, sizeof (*t));
366 t->sw_if_index = sw_if_index1;
367 clib_memcpy (t->src, h1->src_address, 6);
368 clib_memcpy (t->dst, h1->dst_address, 6);
370 if (b2->flags & VLIB_BUFFER_IS_TRACED)
372 ethernet_header_t *h2 = vlib_buffer_get_current (b2);
374 vlib_add_trace (vm, node, b2, sizeof (*t));
375 t->sw_if_index = sw_if_index2;
376 clib_memcpy (t->src, h2->src_address, 6);
377 clib_memcpy (t->dst, h2->dst_address, 6);
379 if (b3->flags & VLIB_BUFFER_IS_TRACED)
381 ethernet_header_t *h3 = vlib_buffer_get_current (b3);
383 vlib_add_trace (vm, node, b3, sizeof (*t));
384 t->sw_if_index = sw_if_index3;
385 clib_memcpy (t->src, h3->src_address, 6);
386 clib_memcpy (t->dst, h3->dst_address, 6);
390 classify_and_dispatch (msm, b0, &next0);
391 classify_and_dispatch (msm, b1, &next1);
392 classify_and_dispatch (msm, b2, &next2);
393 classify_and_dispatch (msm, b3, &next3);
395 /* verify speculative enqueues, maybe switch current next frame */
396 /* if next0==next1==next_index then nothing special needs to be done */
397 vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
398 to_next, n_left_to_next,
400 next0, next1, next2, next3);
403 while (n_left_from > 0 && n_left_to_next > 0)
410 /* speculatively enqueue b0 to the current next frame */
418 b0 = vlib_get_buffer (vm, bi0);
420 if (do_trace && PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
422 ethernet_header_t *h0 = vlib_buffer_get_current (b0);
423 l2input_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
424 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
425 t->sw_if_index = sw_if_index0;
426 clib_memcpy (t->src, h0->src_address, 6);
427 clib_memcpy (t->dst, h0->dst_address, 6);
430 classify_and_dispatch (msm, b0, &next0);
432 /* verify speculative enqueue, maybe switch current next frame */
433 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
434 to_next, n_left_to_next,
438 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
441 vlib_node_increment_counter (vm, l2input_node.index,
442 L2INPUT_ERROR_L2INPUT, frame->n_vectors);
444 return frame->n_vectors;
448 l2input_node_fn (vlib_main_t * vm,
449 vlib_node_runtime_t * node, vlib_frame_t * frame)
451 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
452 return l2input_node_inline (vm, node, frame, 1 /* do_trace */ );
453 return l2input_node_inline (vm, node, frame, 0 /* do_trace */ );
457 VLIB_REGISTER_NODE (l2input_node) = {
458 .function = l2input_node_fn,
460 .vector_size = sizeof (u32),
461 .format_trace = format_l2input_trace,
462 .format_buffer = format_ethernet_header_with_length,
463 .type = VLIB_NODE_TYPE_INTERNAL,
465 .n_errors = ARRAY_LEN(l2input_error_strings),
466 .error_strings = l2input_error_strings,
468 .n_next_nodes = L2INPUT_N_NEXT,
470 /* edit / add dispositions here */
472 [L2INPUT_NEXT_LEARN] = "l2-learn",
473 [L2INPUT_NEXT_FWD] = "l2-fwd",
474 [L2INPUT_NEXT_DROP] = "error-drop",
479 VLIB_NODE_FUNCTION_MULTIARCH (l2input_node, l2input_node_fn)
480 clib_error_t *l2input_init (vlib_main_t * vm)
482 l2input_main_t *mp = &l2input_main;
485 mp->vnet_main = vnet_get_main ();
487 /* Get packets RX'd from L2 interfaces */
488 ethernet_register_l2_input (vm, l2input_node.index);
490 /* Create the config vector */
491 vec_validate (mp->configs, 100);
492 /* create 100 sw interface entries and zero them */
494 /* Initialize the feature next-node indexes */
495 feat_bitmap_init_next_nodes (vm,
498 l2input_get_feat_names (),
499 mp->feat_next_node_index);
504 VLIB_INIT_FUNCTION (l2input_init);
507 /** Get a pointer to the config for the given interface. */
509 l2input_intf_config (u32 sw_if_index)
511 l2input_main_t *mp = &l2input_main;
513 vec_validate (mp->configs, sw_if_index);
514 return vec_elt_at_index (mp->configs, sw_if_index);
517 /** Enable (or disable) the feature in the bitmap for the given interface. */
519 l2input_intf_bitmap_enable (u32 sw_if_index, u32 feature_bitmap, u32 enable)
521 l2_input_config_t *config = l2input_intf_config (sw_if_index);
524 config->feature_bitmap |= feature_bitmap;
526 config->feature_bitmap &= ~feature_bitmap;
528 return config->feature_bitmap;
532 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value)
534 l2_bridge_domain_t *bd_config = l2input_bd_config (bd_index);;
535 bd_validate (bd_config);
536 bd_config->feature_bitmap =
537 (bd_config->feature_bitmap & ~feat_mask) | feat_value;
538 return bd_config->feature_bitmap;
542 * Set the subinterface to run in l2 or l3 mode.
543 * For L3 mode, just the sw_if_index is specified.
544 * For bridged mode, the bd id and bvi flag are also specified.
545 * For xconnect mode, the peer sw_if_index is also specified.
546 * Return 0 if ok, or non-0 if there was an error.
550 set_int_l2_mode (vlib_main_t * vm, vnet_main_t * vnet_main, /* */
551 u32 mode, /* One of L2 modes or back to L3 mode */
552 u32 sw_if_index, /* sw interface index */
553 u32 bd_index, /* for bridged interface */
554 u32 bvi, /* the bridged interface is the BVI */
555 u32 shg, /* the bridged interface split horizon group */
556 u32 xc_sw_if_index) /* peer interface for xconnect */
558 l2input_main_t *mp = &l2input_main;
559 l2output_main_t *l2om = &l2output_main;
560 vnet_main_t *vnm = vnet_get_main ();
561 vnet_hw_interface_t *hi;
562 l2_output_config_t *out_config;
563 l2_input_config_t *config;
564 l2_bridge_domain_t *bd_config;
565 i32 l2_if_adjust = 0;
568 hi = vnet_get_sup_hw_interface (vnet_main, sw_if_index);
569 config = l2input_intf_config (sw_if_index);
573 /* Interface is already in bridge mode. Undo the existing config. */
574 bd_config = vec_elt_at_index (mp->bd_configs, config->bd_index);
576 /* remove interface from flood vector */
577 bd_remove_member (bd_config, sw_if_index);
579 /* undo any BVI-related config */
580 if (bd_config->bvi_sw_if_index == sw_if_index)
582 vnet_sw_interface_t *si;
584 bd_config->bvi_sw_if_index = ~0;
587 /* delete the l2fib entry for the bvi interface */
588 l2fib_del_entry (hi->hw_address, config->bd_index);
590 /* Make loop output node send packet back to ethernet-input node */
592 vlib_node_add_named_next_with_slot (vm, hi->tx_node_index,
594 VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
595 ASSERT (slot == VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
597 /* since this is a no longer BVI interface do not to flood to it */
598 si = vnet_get_sw_interface (vnm, sw_if_index);
599 si->flood_class = VNET_FLOOD_CLASS_NO_FLOOD;
602 /* Clear MACs learned on the interface */
603 if ((config->feature_bitmap & L2INPUT_FEAT_LEARN) ||
604 (bd_config->feature_bitmap & L2INPUT_FEAT_LEARN))
605 l2fib_flush_int_mac (vm, sw_if_index);
609 else if (config->xconnect)
614 /* Make sure vector is big enough */
615 vec_validate_init_empty (l2om->output_node_index_vec, sw_if_index,
618 /* Initialize the l2-input configuration for the interface */
621 /* Set L2 config to BD index 0 so that if any packet accidentally
622 * came in on L2 path, it will be dropped in BD 0 */
623 config->xconnect = 0;
626 config->bd_index = 0;
627 config->feature_bitmap = L2INPUT_FEAT_DROP;
629 /* Clear L2 output config */
630 out_config = l2output_intf_config (sw_if_index);
631 memset (out_config, 0, sizeof (l2_output_config_t));
633 /* Make sure any L2-output packet to this interface now in L3 mode is
634 * dropped. This may happen if L2 FIB MAC entry is stale */
635 l2om->output_node_index_vec[sw_if_index] = L2OUTPUT_NEXT_BAD_INTF;
639 /* Add or update l2-output node next-arc and output_node_index_vec table
640 * for the interface */
641 l2output_create_output_node_mapping (vm, vnet_main, sw_if_index);
643 if (mode == MODE_L2_BRIDGE)
646 * Remove a check that the interface must be an Ethernet.
647 * Specifically so we can bridge to L3 tunnel interfaces.
649 * if (hi->hw_class_index != ethernet_hw_interface_class.index)
653 return MODE_ERROR_ETH; /* non-ethernet */
655 config->xconnect = 0;
657 config->bd_index = bd_index;
658 *l2fib_valid_swif_seq_num (sw_if_index) += 1;
661 * Enable forwarding, flooding, learning and ARP termination by default
662 * (note that ARP term is disabled on BD feature bitmap by default)
664 config->feature_bitmap |= L2INPUT_FEAT_FWD | L2INPUT_FEAT_UU_FLOOD |
665 L2INPUT_FEAT_FLOOD | L2INPUT_FEAT_LEARN | L2INPUT_FEAT_ARP_TERM;
667 /* Make sure last-chance drop is configured */
668 config->feature_bitmap |= L2INPUT_FEAT_DROP;
670 /* Make sure xconnect is disabled */
671 config->feature_bitmap &= ~L2INPUT_FEAT_XCONNECT;
673 /* Set up bridge domain */
674 bd_config = l2input_bd_config (bd_index);
675 bd_validate (bd_config);
677 /* TODO: think: add l2fib entry even for non-bvi interface? */
679 /* Do BVI interface initializations */
682 vnet_sw_interface_t *si;
684 /* ensure BD has no bvi interface (or replace that one with this??) */
685 if (bd_config->bvi_sw_if_index != ~0)
687 return MODE_ERROR_BVI_DEF; /* bd already has a bvi interface */
689 bd_config->bvi_sw_if_index = sw_if_index;
692 /* create the l2fib entry for the bvi interface */
693 l2fib_add_fwd_entry (hi->hw_address, bd_index, sw_if_index, 1, 1); /* static + bvi */
695 /* Disable learning by default. no use since l2fib entry is static. */
696 config->feature_bitmap &= ~L2INPUT_FEAT_LEARN;
698 /* Make loop output node send packet to l2-input node */
700 vlib_node_add_named_next_with_slot (vm, hi->tx_node_index,
702 VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
703 ASSERT (slot == VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
705 /* since this is a BVI interface we want to flood to it */
706 si = vnet_get_sw_interface (vnm, sw_if_index);
707 si->flood_class = VNET_FLOOD_CLASS_BVI;
710 /* Add interface to bridge-domain flood vector */
711 l2_flood_member_t member = {
712 .sw_if_index = sw_if_index,
713 .flags = bvi ? L2_FLOOD_MEMBER_BVI : L2_FLOOD_MEMBER_NORMAL,
716 bd_add_member (bd_config, &member);
719 else if (mode == MODE_L2_XC)
721 config->xconnect = 1;
723 config->output_sw_if_index = xc_sw_if_index;
725 /* Make sure last-chance drop is configured */
726 config->feature_bitmap |= L2INPUT_FEAT_DROP;
728 /* Make sure bridging features are disabled */
729 config->feature_bitmap &=
730 ~(L2INPUT_FEAT_LEARN | L2INPUT_FEAT_FWD | L2INPUT_FEAT_FLOOD);
732 config->feature_bitmap |= L2INPUT_FEAT_XCONNECT;
733 shg = 0; /* not used in xconnect */
735 else if (mode == MODE_L2_CLASSIFY)
737 config->xconnect = 1;
739 config->output_sw_if_index = xc_sw_if_index;
741 /* Make sure last-chance drop is configured */
742 config->feature_bitmap |=
743 L2INPUT_FEAT_DROP | L2INPUT_FEAT_INPUT_CLASSIFY;
745 /* Make sure bridging features are disabled */
746 config->feature_bitmap &=
747 ~(L2INPUT_FEAT_LEARN | L2INPUT_FEAT_FWD | L2INPUT_FEAT_FLOOD);
748 shg = 0; /* not used in xconnect */
750 /* Insure all packets go to ethernet-input */
751 ethernet_set_rx_redirect (vnet_main, hi, 1);
754 /* set up split-horizon group and set output feature bit */
756 out_config = l2output_intf_config (sw_if_index);
757 out_config->shg = shg;
758 out_config->feature_bitmap |= L2OUTPUT_FEAT_OUTPUT;
761 * Test: remove this when non-IP features can be configured.
762 * Enable a non-IP feature to test IP feature masking
763 * config->feature_bitmap |= L2INPUT_FEAT_CTRL_PKT;
769 /* Adjust count of L2 interfaces */
770 hi->l2_if_count += l2_if_adjust;
772 if (hi->hw_class_index == ethernet_hw_interface_class.index)
774 if ((hi->l2_if_count == 1) && (l2_if_adjust == 1))
776 /* Just added first L2 interface on this port */
778 /* Set promiscuous mode on the l2 interface */
779 ethernet_set_flags (vnet_main, hi->hw_if_index,
780 ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);
782 /* ensure all packets go to ethernet-input */
783 ethernet_set_rx_redirect (vnet_main, hi, 1);
786 else if ((hi->l2_if_count == 0) && (l2_if_adjust == -1))
788 /* Just removed only L2 subinterface on this port */
790 /* Disable promiscuous mode on the l2 interface */
791 ethernet_set_flags (vnet_main, hi->hw_if_index, 0);
793 /* Allow ip packets to go directly to ip4-input etc */
794 ethernet_set_rx_redirect (vnet_main, hi, 0);
798 /* Set up the L2/L3 flag in the interface parsing tables */
799 ethernet_sw_interface_set_l2_mode (vnm, sw_if_index, (mode != MODE_L3));
805 * Set subinterface in bridging mode with a bridge-domain ID.
807 * set interface l2 bridge <interface> <bd> [bvi] [split-horizon-group]
809 static clib_error_t *
810 int_l2_bridge (vlib_main_t * vm,
811 unformat_input_t * input, vlib_cli_command_t * cmd)
813 vnet_main_t *vnm = vnet_get_main ();
814 clib_error_t *error = 0;
821 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
823 error = clib_error_return (0, "unknown interface `%U'",
824 format_unformat_error, input);
828 if (!unformat (input, "%d", &bd_id))
830 error = clib_error_return (0, "expected bridge domain ID `%U'",
831 format_unformat_error, input);
835 if (bd_id > L2_BD_ID_MAX)
837 error = clib_error_return (0, "bridge domain ID exceed 16M limit",
838 format_unformat_error, input);
841 bd_index = bd_find_or_add_bd_index (&bd_main, bd_id);
844 bvi = unformat (input, "bvi");
846 /* optional split horizon group */
848 (void) unformat (input, "%d", &shg);
850 /* set the interface mode */
852 set_int_l2_mode (vm, vnm, MODE_L2_BRIDGE, sw_if_index, bd_index, bvi,
855 if (rc == MODE_ERROR_ETH)
857 error = clib_error_return (0, "bridged interface must be ethernet",
858 format_unformat_error, input);
860 else if (rc == MODE_ERROR_BVI_DEF)
863 clib_error_return (0, "bridge-domain already has a bvi interface",
864 format_unformat_error, input);
868 error = clib_error_return (0, "invalid configuration for interface",
869 format_unformat_error, input);
879 * Use this command put an interface into Layer 2 bridge domain. If a
880 * bridge-domain with the provided bridge-domain-id does not exist, it
881 * will be created. Interfaces in a bridge-domain forward packets to
882 * other interfaces in the same bridge-domain based on destination mac
883 * address. To remove an interface from a the Layer 2 bridge domain,
884 * put the interface in a different mode, for example Layer 3 mode.
886 * Optionally, an interface can be added to a Layer 2 bridge-domain as
887 * a Bridged Virtual Interface (bvi). Only one interface in a Layer 2
888 * bridge-domain can be a bvi.
890 * Optionally, a split-horizon group can also be specified. This defaults
891 * to 0 if not specified.
894 * Example of how to configure a Layer 2 bridge-domain with three
895 * interfaces (where 200 is the bridge-domain-id):
896 * @cliexcmd{set interface l2 bridge GigabitEthernet0/8/0.200 200}
897 * This interface is added a BVI interface:
898 * @cliexcmd{set interface l2 bridge GigabitEthernet0/9/0.200 200 bvi}
899 * This interface also has a split-horizon group of 1 specified:
900 * @cliexcmd{set interface l2 bridge GigabitEthernet0/a/0.200 200 1}
901 * Example of how to remove an interface from a Layer2 bridge-domain:
902 * @cliexcmd{set interface l3 GigabitEthernet0/a/0.200}
905 VLIB_CLI_COMMAND (int_l2_bridge_cli, static) = {
906 .path = "set interface l2 bridge",
907 .short_help = "set interface l2 bridge <interface> <bridge-domain-id> [bvi] [shg]",
908 .function = int_l2_bridge,
913 * Set subinterface in xconnect mode with another interface.
915 * set interface l2 xconnect <interface> <peer interface>
917 static clib_error_t *
918 int_l2_xc (vlib_main_t * vm,
919 unformat_input_t * input, vlib_cli_command_t * cmd)
921 vnet_main_t *vnm = vnet_get_main ();
922 clib_error_t *error = 0;
926 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
928 error = clib_error_return (0, "unknown interface `%U'",
929 format_unformat_error, input);
934 (input, unformat_vnet_sw_interface, vnm, &xc_sw_if_index))
936 error = clib_error_return (0, "unknown peer interface `%U'",
937 format_unformat_error, input);
941 /* set the interface mode */
943 (vm, vnm, MODE_L2_XC, sw_if_index, 0, 0, 0, xc_sw_if_index))
945 error = clib_error_return (0, "invalid configuration for interface",
946 format_unformat_error, input);
955 * Use this command put an interface into Layer 2 cross-connect mode.
956 * Both interfaces must be in this mode for bi-directioal traffic. All
957 * packets received on one interface will be transmitted to the other.
958 * To remove the Layer 2 cross-connect, put the interface in a different
959 * mode, for example Layer 3 mode.
962 * Example of how to configure a Layer2 cross-connect between two interfaces:
963 * @cliexcmd{set interface l2 xconnect GigabitEthernet0/8/0.300 GigabitEthernet0/9/0.300}
964 * @cliexcmd{set interface l2 xconnect GigabitEthernet0/9/0.300 GigabitEthernet0/8/0.300}
965 * Example of how to remove a Layer2 cross-connect:
966 * @cliexcmd{set interface l3 GigabitEthernet0/8/0.300}
967 * @cliexcmd{set interface l3 GigabitEthernet0/9/0.300}
970 VLIB_CLI_COMMAND (int_l2_xc_cli, static) = {
971 .path = "set interface l2 xconnect",
972 .short_help = "set interface l2 xconnect <interface> <peer interface>",
973 .function = int_l2_xc,
978 * Set subinterface in L3 mode.
980 * set interface l3 <interface>
982 static clib_error_t *
983 int_l3 (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd)
985 vnet_main_t *vnm = vnet_get_main ();
986 clib_error_t *error = 0;
989 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
991 error = clib_error_return (0, "unknown interface `%U'",
992 format_unformat_error, input);
996 /* set the interface mode */
997 if (set_int_l2_mode (vm, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0))
999 error = clib_error_return (0, "invalid configuration for interface",
1000 format_unformat_error, input);
1009 * Modify the packet processing mode of the interface to Layer 3, which
1010 * implies packets will be routed. This is the default mode of an interface.
1011 * Use this command to remove an interface from a Layer 2 cross-connect or a
1015 * Example of how to set the mode of an interface to Layer 3:
1016 * @cliexcmd{set interface l3 GigabitEthernet0/8/0.200}
1019 VLIB_CLI_COMMAND (int_l3_cli, static) = {
1020 .path = "set interface l3",
1021 .short_help = "set interface l3 <interface>",
1027 * Show interface mode.
1028 * The CLI format is:
1029 * show mode [<if-name1> <if-name2> ...]
1031 static clib_error_t *
1032 show_int_mode (vlib_main_t * vm,
1033 unformat_input_t * input, vlib_cli_command_t * cmd)
1035 vnet_main_t *vnm = vnet_get_main ();
1036 clib_error_t *error = 0;
1039 vnet_interface_main_t *im = &vnm->interface_main;
1041 vnet_sw_interface_t *si, *sis = 0;
1042 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1046 /* See if user wants to show specific interface */
1048 (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
1050 si = pool_elt_at_index (im->sw_interfaces, sw_if_index);
1051 vec_add1 (sis, si[0]);
1055 error = clib_error_return (0, "unknown input `%U'",
1056 format_unformat_error, input);
1061 if (vec_len (sis) == 0) /* Get all interfaces */
1063 /* Gather interfaces. */
1064 sis = vec_new (vnet_sw_interface_t, pool_elts (im->sw_interfaces));
1067 pool_foreach (si, im->sw_interfaces, ({ vec_add1 (sis, si[0]); }));
1071 vec_foreach (si, sis)
1073 l2_input_config_t *config = l2input_intf_config (si->sw_if_index);
1078 bd_id = l2input_main.bd_configs[config->bd_index].bd_id;
1080 args = format (0, "bd_id %d%s%d", bd_id,
1081 config->bvi ? " bvi shg " : " shg ", config->shg);
1083 else if (config->xconnect)
1085 mode = "l2 xconnect";
1086 args = format (0, "%U",
1087 format_vnet_sw_if_index_name,
1088 vnm, config->output_sw_if_index);
1093 args = format (0, " ");
1095 vlib_cli_output (vm, "%s %U %v\n",
1097 format_vnet_sw_if_index_name,
1098 vnm, si->sw_if_index, args);
1109 * Show the packet processing mode (Layer2 xcross-onnect, Layer 2 bridge,
1110 * Layer 3 routed) of all interfaces and sub-interfaces, or limit the
1111 * output to just the provided list of interfaces and sub-interfaces.
1112 * The output shows the mode, the interface, and if the interface is
1113 * a member of a bridge, the bridge-domain-id and the split horizen group (shg).
1116 * Example of displaying the mode of all interfaces:
1117 * @cliexstart{show mode}
1119 * l3 GigabitEthernet0/8/0
1120 * l3 GigabitEthernet0/9/0
1121 * l3 GigabitEthernet0/a/0
1122 * l2 bridge GigabitEthernet0/8/0.200 bd_id 200 shg 0
1123 * l2 bridge GigabitEthernet0/9/0.200 bd_id 200 shg 0
1124 * l2 bridge GigabitEthernet0/a/0.200 bd_id 200 shg 0
1125 * l2 xconnect GigabitEthernet0/8/0.300 GigabitEthernet0/9/0.300
1126 * l2 xconnect GigabitEthernet0/9/0.300 GigabitEthernet0/8/0.300
1128 * Example of displaying the mode of a seleted list of interfaces:
1129 * @cliexstart{show mode GigabitEthernet0/8/0 GigabitEthernet0/8/0.200}
1130 * l3 GigabitEthernet0/8/0
1131 * l2 bridge GigabitEthernet0/8/0.200 bd_id 200 shg 0
1135 VLIB_CLI_COMMAND (show_l2_mode, static) = {
1136 .path = "show mode",
1137 .short_help = "show mode [<if-name1> <if-name2> ...]",
1138 .function = show_int_mode,
1142 #define foreach_l2_init_function \
1143 _(feat_bitmap_drop_init) \
1145 _(l2_input_classify_init) \
1148 _(l2_in_out_acl_init) \
1152 _(l2_efp_filter_init) \
1160 l2_init (vlib_main_t * vm)
1162 clib_error_t *error;
1165 if ((error = vlib_call_init_function (vm, a))) return error; } \
1167 foreach_l2_init_function;
1172 VLIB_INIT_FUNCTION (l2_init);
1175 * fd.io coding-style-patch-verification: ON
1178 * eval: (c-set-style "gnu")