--- /dev/null
+/*
+ * l2e_node.c : l2 emulation node
+ *
+ * Copyright (c) 2019 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 <plugins/l2e/l2e.h>
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/feat_bitmap.h>
+
+#define foreach_l2_emulation \
+ _(IP4, "Extract IPv4") \
+ _(IP6, "Extract IPv6")
+
+typedef enum
+{
+#define _(sym,str) L2_EMULATION_ERROR_##sym,
+ foreach_l2_emulation
+#undef _
+ L2_EMULATION_N_ERROR,
+} l2_emulation_error_t;
+
+static char *l2_emulation_error_strings[] = {
+#define _(sym,string) string,
+ foreach_l2_emulation
+#undef _
+};
+
+typedef enum
+{
+#define _(sym,str) L2_EMULATION_NEXT_##sym,
+ foreach_l2_emulation
+#undef _
+ L2_EMULATION_N_NEXT,
+} l2_emulation_next_t;
+
+/* packet trace format function */
+static u8 *
+format_l2_emulation_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 *);
+ l2_emulation_trace_t *t = va_arg (*args, l2_emulation_trace_t *);
+
+ s = format (s, "l2-emulation: %s", (t->extracted ? "yes" : "no"));
+
+ return s;
+}
+
+VLIB_NODE_FN (l2_emulation_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ l2_emulation_main_t *em = &l2_emulation_main;
+ u32 n_left_from, *from, *to_next;
+ l2_emulation_next_t next_index;
+ u32 ip4_hits = 0;
+ u32 ip6_hits = 0;
+
+ next_index = 0;
+ n_left_from = frame->n_vectors;
+ from = vlib_frame_vector_args (frame);
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ vlib_buffer_t *b0, *b1;
+ u32 sw_if_index0, sw_if_index1;
+ u16 ether_type0, ether_type1;
+ u32 next0 = ~0, next1 = ~0;
+ u8 l2_len0, l2_len1;
+ u32 bi0, bi1;
+ u8 *h0, *h1;
+
+ bi0 = to_next[0] = from[0];
+ bi1 = to_next[1] = from[1];
+
+ from += 2;
+ n_left_from -= 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+ l2_len0 = vnet_buffer (b0)->l2.l2_len;
+ l2_len1 = vnet_buffer (b1)->l2.l2_len;
+
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+
+ ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
+ ether_type1 = clib_net_to_host_u16 (*(u16 *) (h1 + l2_len1 - 2));
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+
+ /*
+ * only extract unicast
+ */
+ if (PREDICT_TRUE (!(h0[0] & 0x1)))
+ {
+ switch (ether_type0)
+ {
+ case ETHERNET_TYPE_IP4:
+ ASSERT (em->l2_emulations[sw_if_index0].enabled);
+ ++ip4_hits;
+ next0 = L2_EMULATION_NEXT_IP4;
+ vlib_buffer_advance (b0, l2_len0);
+ break;
+ case ETHERNET_TYPE_IP6:
+ ASSERT (em->l2_emulations[sw_if_index0].enabled);
+ ++ip6_hits;
+ next0 = L2_EMULATION_NEXT_IP6;
+ vlib_buffer_advance (b0, l2_len0);
+ default:
+ break;
+ }
+ }
+ if (PREDICT_TRUE (!(h1[0] & 0x1)))
+ {
+ switch (ether_type1)
+ {
+ case ETHERNET_TYPE_IP4:
+ ASSERT (em->l2_emulations[sw_if_index1].enabled);
+ ++ip4_hits;
+ next1 = L2_EMULATION_NEXT_IP4;
+ vlib_buffer_advance (b1, l2_len1);
+ break;
+ case ETHERNET_TYPE_IP6:
+ ASSERT (em->l2_emulations[sw_if_index1].enabled);
+ ++ip6_hits;
+ next1 = L2_EMULATION_NEXT_IP6;
+ vlib_buffer_advance (b1, l2_len1);
+ default:
+ break;
+ }
+ }
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2_emulation_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->extracted = (next0 != ~0);
+ }
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2_emulation_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->extracted = (next1 != ~0);
+ }
+
+ /* Determine the next node and remove ourself from bitmap */
+ if (PREDICT_TRUE (next0 == ~0))
+ next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next,
+ L2INPUT_FEAT_L2_EMULATION);
+
+ /* Determine the next node and remove ourself from bitmap */
+ if (PREDICT_TRUE (next1 == ~0))
+ next1 = vnet_l2_feature_next (b1, em->l2_input_feat_next,
+ L2INPUT_FEAT_L2_EMULATION);
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ vlib_buffer_t *b0;
+ u32 sw_if_index0;
+ u16 ether_type0;
+ u32 next0 = ~0;
+ u8 l2_len0;
+ u32 bi0;
+ u8 *h0;
+
+ 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);
+ l2_len0 = vnet_buffer (b0)->l2.l2_len;
+
+ h0 = vlib_buffer_get_current (b0);
+ ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+ /*
+ * only extract unicast
+ */
+ if (PREDICT_TRUE (!(h0[0] & 0x1)))
+ {
+ switch (ether_type0)
+ {
+ case ETHERNET_TYPE_IP4:
+ ASSERT (em->l2_emulations[sw_if_index0].enabled);
+ ++ip4_hits;
+ next0 = L2_EMULATION_NEXT_IP4;
+ vlib_buffer_advance (b0, l2_len0);
+ break;
+ case ETHERNET_TYPE_IP6:
+ ASSERT (em->l2_emulations[sw_if_index0].enabled);
+ ++ip6_hits;
+ next0 = L2_EMULATION_NEXT_IP6;
+ vlib_buffer_advance (b0, l2_len0);
+ default:
+ break;
+ }
+ }
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2_emulation_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->extracted = (next0 != ~0);
+ }
+
+ /* Determine the next node and remove ourself from bitmap */
+ if (PREDICT_TRUE (next0 == ~0))
+ next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next,
+ L2INPUT_FEAT_L2_EMULATION);
+
+ /* 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);
+ }
+
+ vlib_node_increment_counter (vm, node->node_index,
+ L2_EMULATION_ERROR_IP4, ip4_hits);
+ vlib_node_increment_counter (vm, node->node_index,
+ L2_EMULATION_ERROR_IP6, ip6_hits);
+
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2_emulation_node) = {
+ .name = "l2-emulation",
+ .vector_size = sizeof (u32),
+ .format_trace = format_l2_emulation_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(l2_emulation_error_strings),
+ .error_strings = l2_emulation_error_strings,
+
+ .n_next_nodes = L2_EMULATION_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [L2_EMULATION_NEXT_IP4] = "ip4-input",
+ [L2_EMULATION_NEXT_IP6] = "ip6-input",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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