Driver level time-based src mac filter

Change-Id: I062d7653e00d77e73a61d8841e01ab4a159b6404
Signed-off-by: Dave Barach <dbarach@cisco.com>

1 files changed, 363 insertions, 0 deletions

diff --git a/src/plugins/mactime/node.c b/src/plugins/mactime/node.c
new file mode 100644
index 00000000000..b112a7251cf
--- /dev/null
+++ b/src/plugins/mactime/node.c
@@ -0,0 +1,363 @@
+/*
+ * node.c - skeleton vpp engine plug-in dual-loop node skeleton
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * 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 <vppinfra/error.h>
+#include <mactime/mactime.h>
+
+typedef struct
+{
+  u32 next_index;
+  u32 device_index;
+  u8 src_mac[6];
+  u8 device_name[64];
+} mactime_trace_t;
+
+static u8 *
+format_mac_address (u8 * s, va_list * args)
+{
+  u8 *a = va_arg (*args, u8 *);
+  return format (s, "%02x:%02x:%02x:%02x:%02x:%02x",
+		 a[0], a[1], a[2], a[3], a[4], a[5]);
+}
+
+vlib_node_registration_t mactime_node;
+
+#define foreach_mactime_error                   \
+_(DROP, "Dropped packets")                      \
+_(OK, "Permitted packets")
+
+typedef enum
+{
+#define _(sym,str) MACTIME_ERROR_##sym,
+  foreach_mactime_error
+#undef _
+    MACTIME_N_ERROR,
+} mactime_error_t;
+
+static char *mactime_error_strings[] = {
+#define _(sym,string) string,
+  foreach_mactime_error
+#undef _
+};
+
+typedef enum
+{
+  MACTIME_NEXT_ETHERNET_INPUT,
+  MACTIME_NEXT_DROP,
+  MACTIME_N_NEXT,
+} mactime_next_t;
+
+/* packet trace format function */
+static u8 *
+format_mactime_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 *);
+  mactime_trace_t *t = va_arg (*args, mactime_trace_t *);
+
+  s = format (s, "MACTIME: src mac %U device %s result %s\n",
+	      format_mac_address, t->src_mac,
+	      (t->device_index != ~0) ? t->device_name : (u8 *) "unknown",
+	      t->next_index == MACTIME_NEXT_ETHERNET_INPUT ? "pass" : "drop");
+  return s;
+}
+
+static uword
+mactime_node_fn (vlib_main_t * vm,
+		 vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  u32 n_left_from, *from, *to_next;
+  mactime_next_t next_index;
+  mactime_main_t *mm = &mactime_main;
+  mactime_device_t *dp;
+  clib_bihash_kv_8_8_t kv;
+  clib_bihash_8_8_t *lut = &mm->lookup_table;
+  u32 packets_ok = 0, packets_dropped = 0;
+  f64 now;
+  u32 thread_index = vm->thread_index;
+
+  now = clib_timebase_now (&mm->timebase);
+
+  if (PREDICT_FALSE ((now - mm->sunday_midnight) > 86400.0 * 7.0))
+    mm->sunday_midnight = clib_timebase_find_sunday_midnight (now);
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+#if 0
+      while (n_left_from >= 4 && n_left_to_next >= 2)
+	{
+	  u32 next0 = MACTIME_NEXT_INTERFACE_OUTPUT;
+	  u32 next1 = MACTIME_NEXT_INTERFACE_OUTPUT;
+	  u32 sw_if_index0, sw_if_index1;
+	  u8 tmp0[6], tmp1[6];
+	  ethernet_header_t *en0, *en1;
+	  u32 bi0, bi1;
+	  vlib_buffer_t *b0, *b1;
+
+	  /* Prefetch next iteration. */
+	  {
+	    vlib_buffer_t *p2, *p3;
+
+	    p2 = vlib_get_buffer (vm, from[2]);
+	    p3 = vlib_get_buffer (vm, from[3]);
+
+	    vlib_prefetch_buffer_header (p2, LOAD);
+	    vlib_prefetch_buffer_header (p3, LOAD);
+
+	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+	  }
+
+	  /* speculatively enqueue b0 and b1 to the current next frame */
+	  to_next[0] = bi0 = from[0];
+	  to_next[1] = bi1 = from[1];
+	  from += 2;
+	  to_next += 2;
+	  n_left_from -= 2;
+	  n_left_to_next -= 2;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  b1 = vlib_get_buffer (vm, bi1);
+
+	  ASSERT (b0->current_data == 0);
+	  ASSERT (b1->current_data == 0);
+
+	  en0 = vlib_buffer_get_current (b0);
+	  en1 = vlib_buffer_get_current (b1);
+
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+
+	  /* Send pkt back out the RX interface */
+	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
+	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = sw_if_index1;
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+	    {
+	      if (b0->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  mactime_trace_t *t =
+		    vlib_add_trace (vm, node, b0, sizeof (*t));
+		  t->sw_if_index = sw_if_index0;
+		  t->next_index = next0;
+		  clib_memcpy (t->new_src_mac, en0->src_address,
+			       sizeof (t->new_src_mac));
+		  clib_memcpy (t->new_dst_mac, en0->dst_address,
+			       sizeof (t->new_dst_mac));
+		}
+	      if (b1->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  mactime_trace_t *t =
+		    vlib_add_trace (vm, node, b1, sizeof (*t));
+		  t->sw_if_index = sw_if_index1;
+		  t->next_index = next1;
+		  clib_memcpy (t->new_src_mac, en1->src_address,
+			       sizeof (t->new_src_mac));
+		  clib_memcpy (t->new_dst_mac, en1->dst_address,
+			       sizeof (t->new_dst_mac));
+		}
+	    }
+
+	  /* verify speculative enqueues, maybe switch current next frame */
+	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi0, bi1, next0, next1);
+	}
+#endif /* dual loop */
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  u32 next0 = MACTIME_NEXT_ETHERNET_INPUT;
+	  u32 device_index0;
+	  ethernet_header_t *en0;
+	  int i;
+
+	  /* 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);
+
+	  vlib_buffer_advance (b0, -(word) vnet_buffer (b0)->l2_hdr_offset);
+
+	  en0 = vlib_buffer_get_current (b0);
+	  kv.key = 0;
+	  clib_memcpy (&kv.key, en0->src_address, 6);
+
+
+	  /* Lookup the src mac address */
+	  if (clib_bihash_search_8_8 (lut, &kv, &kv) < 0)
+	    {
+	      device_index0 = ~0;
+	      dp = 0;
+	      goto trace0;
+	    }
+	  else
+	    device_index0 = kv.value;
+
+	  dp = pool_elt_at_index (mm->devices, device_index0);
+
+	  /* Static drop / allow? */
+	  if (PREDICT_FALSE
+	      (dp->flags &
+	       (MACTIME_DEVICE_FLAG_STATIC_DROP
+		| MACTIME_DEVICE_FLAG_STATIC_ALLOW)))
+	    {
+	      if (dp->flags & MACTIME_DEVICE_FLAG_STATIC_DROP)
+		{
+		  next0 = MACTIME_NEXT_DROP;
+		  vlib_increment_simple_counter
+		    (&mm->drop_counters, thread_index, dp - mm->devices, 1);
+		  packets_dropped++;
+		}
+	      else		/* note next0 set to allow */
+		{
+		  vlib_increment_simple_counter
+		    (&mm->allow_counters, thread_index, dp - mm->devices, 1);
+		  packets_ok++;
+		}
+	      goto trace0;
+	    }
+
+	  /* Known device, see if traffic allowed at the moment */
+	  for (i = 0; i < vec_len (dp->ranges); i++)
+	    {
+	      clib_timebase_range_t *r = dp->ranges + i;
+	      f64 start0, end0;
+
+	      start0 = r->start + mm->sunday_midnight;
+	      end0 = r->end + mm->sunday_midnight;
+	      /* Packet within time range */
+	      if (now >= start0 && now <= end0)
+		{
+		  /* And it's a drop range, drop it */
+		  if (dp->flags & MACTIME_DEVICE_FLAG_DYNAMIC_DROP)
+		    {
+		      vlib_increment_simple_counter
+			(&mm->drop_counters, thread_index,
+			 dp - mm->devices, 1);
+		      packets_dropped++;
+		      next0 = MACTIME_NEXT_DROP;
+		    }
+		  else		/* it's an allow range, allow it */
+		    {
+		      vlib_increment_simple_counter
+			(&mm->allow_counters, thread_index,
+			 dp - mm->devices, 1);
+		      packets_ok++;
+		    }
+		  goto trace0;
+		}
+	    }
+	  /*
+	   * Didn't hit a range, so *drop* if allow configured, or
+	   * *allow* if drop configured.
+	   */
+	  if (dp->flags & MACTIME_DEVICE_FLAG_DYNAMIC_ALLOW)
+	    {
+	      next0 = MACTIME_NEXT_DROP;
+	      vlib_increment_simple_counter
+		(&mm->drop_counters, thread_index, dp - mm->devices, 1);
+	      packets_dropped++;
+	    }
+	  else
+	    {
+	      vlib_increment_simple_counter
+		(&mm->allow_counters, thread_index, dp - mm->devices, 1);
+	      packets_ok++;
+	    }
+
+	trace0:
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      mactime_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+	      clib_memcpy (t->src_mac, en0->src_address, sizeof (t->src_mac));
+
+	      t->next_index = next0;
+	      t->device_index = device_index0;
+
+	      if (dp)
+		{
+		  clib_memcpy (t->device_name, dp->device_name,
+			       ARRAY_LEN (t->device_name));
+		  t->device_name[ARRAY_LEN (t->device_name) - 1] = 0;
+		}
+	    }
+
+	  /* 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, mactime_node.index,
+			       MACTIME_ERROR_DROP, packets_dropped);
+  vlib_node_increment_counter (vm, mactime_node.index,
+			       MACTIME_ERROR_OK, packets_ok);
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (mactime_node) =
+{
+  .function = mactime_node_fn,
+  .name = "mactime",
+  .vector_size = sizeof (u32),
+  .format_trace = format_mactime_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(mactime_error_strings),
+  .error_strings = mactime_error_strings,
+
+  .n_next_nodes = MACTIME_N_NEXT,
+
+  /* edit / add dispositions here */
+  .next_nodes =
+  {
+    [MACTIME_NEXT_ETHERNET_INPUT] = "ethernet-input",
+    [MACTIME_NEXT_DROP] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */