--- /dev/null
+/*
+ * l2_fwd.c : layer 2 forwarding using l2fib
+ *
+ * Copyright (c) 2013 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vlib/cli.h>
+
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/l2_bvi.h>
+#include <vnet/l2/l2_fwd.h>
+#include <vnet/l2/l2_fib.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/sparse_vec.h>
+
+
+/**
+ * @file
+ * @brief Ethernet Forwarding.
+ *
+ * Code in this file handles forwarding Layer 2 packets. This file calls
+ * the FIB lookup, packet learning and the packet flooding as necessary.
+ * Packet is then sent to the next graph node.
+ */
+
+typedef struct
+{
+
+ /* Hash table */
+ BVT (clib_bihash) * mac_table;
+
+ /* next node index for the L3 input node of each ethertype */
+ next_by_ethertype_t l3_next;
+
+ /* convenience variables */
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+} l2fwd_main_t;
+
+typedef struct
+{
+ /* per-pkt trace data */
+ u8 src[6];
+ u8 dst[6];
+ u32 sw_if_index;
+ u16 bd_index;
+} l2fwd_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_l2fwd_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ l2fwd_trace_t *t = va_arg (*args, l2fwd_trace_t *);
+
+ s = format (s, "l2-fwd: sw_if_index %d dst %U src %U bd_index %d",
+ t->sw_if_index,
+ format_ethernet_address, t->dst,
+ format_ethernet_address, t->src, t->bd_index);
+ return s;
+}
+
+l2fwd_main_t l2fwd_main;
+
+static vlib_node_registration_t l2fwd_node;
+
+#define foreach_l2fwd_error \
+_(L2FWD, "L2 forward packets") \
+_(FLOOD, "L2 forward misses") \
+_(HIT, "L2 forward hits") \
+_(BVI_BAD_MAC, "BVI L3 MAC mismatch") \
+_(BVI_ETHERTYPE, "BVI packet with unhandled ethertype") \
+_(FILTER_DROP, "Filter Mac Drop") \
+_(REFLECT_DROP, "Reflection Drop")
+
+typedef enum
+{
+#define _(sym,str) L2FWD_ERROR_##sym,
+ foreach_l2fwd_error
+#undef _
+ L2FWD_N_ERROR,
+} l2fwd_error_t;
+
+static char *l2fwd_error_strings[] = {
+#define _(sym,string) string,
+ foreach_l2fwd_error
+#undef _
+};
+
+typedef enum
+{
+ L2FWD_NEXT_L2_OUTPUT,
+ L2FWD_NEXT_FLOOD,
+ L2FWD_NEXT_DROP,
+ L2FWD_N_NEXT,
+} l2fwd_next_t;
+
+/** Forward one packet based on the mac table lookup result. */
+
+static_always_inline void
+l2fwd_process (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ l2fwd_main_t * msm,
+ vlib_error_main_t * em,
+ vlib_buffer_t * b0,
+ u32 sw_if_index0, l2fib_entry_result_t * result0, u32 * next0)
+{
+ if (PREDICT_FALSE (result0->raw == ~0))
+ {
+ /*
+ * lookup miss, so flood
+ * TODO:replicate packet to each intf in bridge-domain
+ * For now just drop
+ */
+ if (vnet_buffer (b0)->l2.feature_bitmap & L2INPUT_FEAT_UU_FLOOD)
+ {
+ *next0 = L2FWD_NEXT_FLOOD;
+ }
+ else
+ {
+ /* Flooding is disabled */
+ b0->error = node->errors[L2FWD_ERROR_FLOOD];
+ *next0 = L2FWD_NEXT_DROP;
+ }
+
+ }
+ else
+ {
+
+ /* lookup hit, forward packet */
+#ifdef COUNTERS
+ em->counters[node_counter_base_index + L2FWD_ERROR_HIT] += 1;
+#endif
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = result0->fields.sw_if_index;
+ *next0 = L2FWD_NEXT_L2_OUTPUT;
+
+ /* perform reflection check */
+ if (PREDICT_FALSE (sw_if_index0 == result0->fields.sw_if_index))
+ {
+ b0->error = node->errors[L2FWD_ERROR_REFLECT_DROP];
+ *next0 = L2FWD_NEXT_DROP;
+
+ /* perform filter check */
+ }
+ else if (PREDICT_FALSE (result0->fields.filter))
+ {
+ b0->error = node->errors[L2FWD_ERROR_FILTER_DROP];
+ *next0 = L2FWD_NEXT_DROP;
+
+ /* perform BVI check */
+ }
+ else if (PREDICT_FALSE (result0->fields.bvi))
+ {
+ u32 rc;
+ rc = l2_to_bvi (vm,
+ msm->vnet_main,
+ b0,
+ vnet_buffer (b0)->sw_if_index[VLIB_TX],
+ &msm->l3_next, next0);
+
+ if (PREDICT_FALSE (rc))
+ {
+ if (rc == TO_BVI_ERR_BAD_MAC)
+ {
+ b0->error = node->errors[L2FWD_ERROR_BVI_BAD_MAC];
+ *next0 = L2FWD_NEXT_DROP;
+ }
+ else if (rc == TO_BVI_ERR_ETHERTYPE)
+ {
+ b0->error = node->errors[L2FWD_ERROR_BVI_ETHERTYPE];
+ *next0 = L2FWD_NEXT_DROP;
+ }
+ }
+ }
+ }
+}
+
+
+static uword
+l2fwd_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ l2fwd_next_t next_index;
+ l2fwd_main_t *msm = &l2fwd_main;
+ vlib_node_t *n = vlib_get_node (vm, l2fwd_node.index);
+ CLIB_UNUSED (u32 node_counter_base_index) = n->error_heap_index;
+ vlib_error_main_t *em = &vm->error_main;
+ l2fib_entry_key_t cached_key;
+ l2fib_entry_result_t cached_result;
+
+ /* Clear the one-entry cache in case mac table was updated */
+ cached_key.raw = ~0;
+ cached_result.raw = ~0;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors; /* number of packets to process */
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ /* get space to enqueue frame to graph node "next_index" */
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from >= 8 && n_left_to_next >= 4)
+ {
+ u32 bi0, bi1, bi2, bi3;
+ vlib_buffer_t *b0, *b1, *b2, *b3;
+ u32 next0, next1, next2, next3;
+ u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
+ ethernet_header_t *h0, *h1, *h2, *h3;
+ l2fib_entry_key_t key0, key1, key2, key3;
+ l2fib_entry_result_t result0, result1, result2, result3;
+ u32 bucket0, bucket1, bucket2, bucket3;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p4, *p5, *p6, *p7;
+
+ p4 = vlib_get_buffer (vm, from[4]);
+ p5 = vlib_get_buffer (vm, from[5]);
+ p6 = vlib_get_buffer (vm, from[6]);
+ p7 = vlib_get_buffer (vm, from[7]);
+
+ vlib_prefetch_buffer_header (p4, LOAD);
+ vlib_prefetch_buffer_header (p5, LOAD);
+ vlib_prefetch_buffer_header (p6, LOAD);
+ vlib_prefetch_buffer_header (p7, LOAD);
+
+ CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p6->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p7->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ /* speculatively enqueue b0 and b1 to the current next frame */
+ /* bi is "buffer index", b is pointer to the buffer */
+ to_next[0] = bi0 = from[0];
+ to_next[1] = bi1 = from[1];
+ to_next[2] = bi2 = from[2];
+ to_next[3] = bi3 = from[3];
+ from += 4;
+ to_next += 4;
+ n_left_from -= 4;
+ n_left_to_next -= 4;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+ b2 = vlib_get_buffer (vm, bi2);
+ b3 = vlib_get_buffer (vm, bi3);
+
+ /* RX interface handles */
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+ sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX];
+ sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX];
+
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+ h2 = vlib_buffer_get_current (b2);
+ h3 = vlib_buffer_get_current (b3);
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+ {
+ if (b0->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2fwd_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->bd_index = vnet_buffer (b0)->l2.bd_index;
+ clib_memcpy (t->src, h0->src_address, 6);
+ clib_memcpy (t->dst, h0->dst_address, 6);
+ }
+ if (b1->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2fwd_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->sw_if_index = sw_if_index1;
+ t->bd_index = vnet_buffer (b1)->l2.bd_index;
+ clib_memcpy (t->src, h1->src_address, 6);
+ clib_memcpy (t->dst, h1->dst_address, 6);
+ }
+ if (b2->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2fwd_trace_t *t =
+ vlib_add_trace (vm, node, b2, sizeof (*t));
+ t->sw_if_index = sw_if_index2;
+ t->bd_index = vnet_buffer (b2)->l2.bd_index;
+ clib_memcpy (t->src, h2->src_address, 6);
+ clib_memcpy (t->dst, h2->dst_address, 6);
+ }
+ if (b3->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2fwd_trace_t *t =
+ vlib_add_trace (vm, node, b3, sizeof (*t));
+ t->sw_if_index = sw_if_index3;
+ t->bd_index = vnet_buffer (b3)->l2.bd_index;
+ clib_memcpy (t->src, h3->src_address, 6);
+ clib_memcpy (t->dst, h3->dst_address, 6);
+ }
+ }
+
+ /* process 2 pkts */
+#ifdef COUNTERS
+ em->counters[node_counter_base_index + L2FWD_ERROR_L2FWD] += 4;
+#endif
+ /* *INDENT-OFF* */
+ l2fib_lookup_4 (msm->mac_table, &cached_key, &cached_result,
+ h0->dst_address, h1->dst_address,
+ h2->dst_address, h3->dst_address,
+ vnet_buffer (b0)->l2.bd_index,
+ vnet_buffer (b1)->l2.bd_index,
+ vnet_buffer (b2)->l2.bd_index,
+ vnet_buffer (b3)->l2.bd_index,
+ &key0, /* not used */
+ &key1, /* not used */
+ &key2, /* not used */
+ &key3, /* not used */
+ &bucket0, /* not used */
+ &bucket1, /* not used */
+ &bucket2, /* not used */
+ &bucket3, /* not used */
+ &result0,
+ &result1,
+ &result2,
+ &result3);
+ /* *INDENT-ON* */
+ l2fwd_process (vm, node, msm, em, b0, sw_if_index0, &result0,
+ &next0);
+ l2fwd_process (vm, node, msm, em, b1, sw_if_index1, &result1,
+ &next1);
+ l2fwd_process (vm, node, msm, em, b2, sw_if_index2, &result2,
+ &next2);
+ l2fwd_process (vm, node, msm, em, b3, sw_if_index3, &result3,
+ &next3);
+
+ /* verify speculative enqueues, maybe switch current next frame */
+ /* if next0==next1==next_index then nothing special needs to be done */
+ vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, bi2, bi3,
+ next0, next1, next2, next3);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u32 sw_if_index0;
+ ethernet_header_t *h0;
+ l2fib_entry_key_t key0;
+ l2fib_entry_result_t result0;
+ u32 bucket0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+ h0 = vlib_buffer_get_current (b0);
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2fwd_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->bd_index = vnet_buffer (b0)->l2.bd_index;
+ clib_memcpy (t->src, h0->src_address, 6);
+ clib_memcpy (t->dst, h0->dst_address, 6);
+ }
+
+ /* process 1 pkt */
+#ifdef COUNTERS
+ em->counters[node_counter_base_index + L2FWD_ERROR_L2FWD] += 1;
+#endif
+ l2fib_lookup_1 (msm->mac_table, &cached_key, &cached_result, h0->dst_address, vnet_buffer (b0)->l2.bd_index, &key0, /* not used */
+ &bucket0, /* not used */
+ &result0);
+ l2fwd_process (vm, node, msm, em, b0, sw_if_index0, &result0,
+ &next0);
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2fwd_node,static) = {
+ .function = l2fwd_node_fn,
+ .name = "l2-fwd",
+ .vector_size = sizeof (u32),
+ .format_trace = format_l2fwd_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(l2fwd_error_strings),
+ .error_strings = l2fwd_error_strings,
+
+ .n_next_nodes = L2FWD_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [L2FWD_NEXT_L2_OUTPUT] = "l2-output",
+ [L2FWD_NEXT_FLOOD] = "l2-flood",
+ [L2FWD_NEXT_DROP] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (l2fwd_node, l2fwd_node_fn)
+ clib_error_t *l2fwd_init (vlib_main_t * vm)
+{
+ l2fwd_main_t *mp = &l2fwd_main;
+
+ mp->vlib_main = vm;
+ mp->vnet_main = vnet_get_main ();
+
+ /* init the hash table ptr */
+ mp->mac_table = get_mac_table ();
+
+ /* Initialize the next nodes for each ethertype */
+ next_by_ethertype_init (&mp->l3_next);
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (l2fwd_init);
+
+
+/** Add the L3 input node for this ethertype to the next nodes structure. */
+void
+l2fwd_register_input_type (vlib_main_t * vm,
+ ethernet_type_t type, u32 node_index)
+{
+ l2fwd_main_t *mp = &l2fwd_main;
+ u32 next_index;
+
+ next_index = vlib_node_add_next (vm, l2fwd_node.index, node_index);
+
+ next_by_ethertype_register (&mp->l3_next, type, next_index);
+}
+
+
+/**
+ * Set subinterface forward enable/disable.
+ * The CLI format is:
+ * set interface l2 forward <interface> [disable]
+ */
+static clib_error_t *
+int_fwd (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ clib_error_t *error = 0;
+ u32 sw_if_index;
+ u32 enable;
+
+ if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
+ {
+ error = clib_error_return (0, "unknown interface `%U'",
+ format_unformat_error, input);
+ goto done;
+ }
+
+ enable = 1;
+ if (unformat (input, "disable"))
+ {
+ enable = 0;
+ }
+
+ /* set the interface flag */
+ if (l2input_intf_config (sw_if_index)->xconnect)
+ {
+ l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_XCONNECT, enable);
+ }
+ else
+ {
+ l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_FWD, enable);
+ }
+
+done:
+ return error;
+}
+
+/*?
+ * Layer 2 unicast forwarding can be enabled and disabled on each
+ * interface and on each bridge-domain. Use this command to
+ * manage interfaces. It is enabled by default.
+ *
+ * @cliexpar
+ * Example of how to enable fowarding:
+ * @cliexcmd{set interface l2 forward GigabitEthernet0/8/0}
+ * Example of how to disable fowarding:
+ * @cliexcmd{set interface l2 forward GigabitEthernet0/8/0 disable}
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (int_fwd_cli, static) = {
+ .path = "set interface l2 forward",
+ .short_help = "set interface l2 forward <interface> [disable]",
+ .function = int_fwd,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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