Mcast rewrite no memcpy

use a 32bit mask in the adjacency to AND with the IP address and OR into the rewrite.

Change-Id: I80b0f246c18fd74f3e43c5d49e25833412f34665
Signed-off-by: Neale Ranns <nranns@cisco.com>

4 files changed, 29 insertions, 27 deletions

diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c
index 7352c2e7..f2bc2a71 100644
--- a/src/vnet/ip/ip4_forward.c
+++ b/src/vnet/ip/ip4_forward.c
@@ -2553,8 +2553,8 @@ ip4_rewrite_inline (vlib_main_t * vm,
 	      /*
 	       * copy bytes from the IP address into the MAC rewrite
 	       */
-	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 1);
-	      vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1, 1);
+	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
+	      vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
 	    }
 
 	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
@@ -2635,7 +2635,7 @@ ip4_rewrite_inline (vlib_main_t * vm,
 	      /*
 	       * copy bytes from the IP address into the MAC rewrite
 	       */
-	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 1);
+	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
 	    }
 
 	  /* Update packet buffer attributes/set output interface. */
diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c
index 0b8691bf..ecc3bd2c 100644
--- a/src/vnet/ip/ip6_forward.c
+++ b/src/vnet/ip/ip6_forward.c
@@ -2087,8 +2087,8 @@ ip6_rewrite_inline (vlib_main_t * vm,
 	      /*
 	       * copy bytes from the IP address into the MAC rewrite
 	       */
-	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 0);
-	      vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1, 0);
+	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
+	      vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
 	    }
 
 	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
@@ -2197,7 +2197,7 @@ ip6_rewrite_inline (vlib_main_t * vm,
 	    }
 	  if (is_mcast)
 	    {
-	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 0);
+	      vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
 	    }
 
 	  p0->error = error_node->errors[error0];
diff --git a/src/vnet/ip/ip6_neighbor.c b/src/vnet/ip/ip6_neighbor.c
index 8d355ab2..9b616630 100644
--- a/src/vnet/ip/ip6_neighbor.c
+++ b/src/vnet/ip/ip6_neighbor.c
@@ -530,28 +530,29 @@ ip6_ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
 	}
       break;
     case IP_LOOKUP_NEXT_MCAST:
-      /*
-       * Construct a partial rewrite from the known ethernet mcast dest MAC
-       */
-      adj_mcast_update_rewrite
-	(ai,
-	 ethernet_build_rewrite (vnm,
-				 sw_if_index,
-				 adj->ia_link,
-				 ethernet_ip6_mcast_dst_addr ()));
-
-      /*
-       * Complete the remaining fields of the adj's rewrite to direct the
-       * complete of the rewrite at switch time by copying in the IP
-       * dst address's bytes.
-       * Ofset is 12 bytes from the end of the MAC header - which is 2
-       * bytes into the desintation address. And we write 4 bytes.
-       */
-      adj->rewrite_header.dst_mcast_offset = 12;
-      adj->rewrite_header.dst_mcast_n_bytes = 4;
-
-      break;
+      {
+	/*
+	 * Construct a partial rewrite from the known ethernet mcast dest MAC
+	 */
+	u8 *rewrite;
+	u8 offset;
+
+	rewrite = ethernet_build_rewrite (vnm,
+					  sw_if_index,
+					  adj->ia_link,
+					  ethernet_ip6_mcast_dst_addr ());
+
+	/*
+	 * Complete the remaining fields of the adj's rewrite to direct the
+	 * complete of the rewrite at switch time by copying in the IP
+	 * dst address's bytes.
+	 * Ofset is 2 bytes into the desintation address. And we write 4 bytes.
+	 */
+	offset = vec_len (rewrite) - 2;
+	adj_mcast_update_rewrite (ai, rewrite, offset, 0xffffffff);
 
+	break;
+      }
     case IP_LOOKUP_NEXT_DROP:
     case IP_LOOKUP_NEXT_PUNT:
     case IP_LOOKUP_NEXT_LOCAL:
diff --git a/src/vnet/ip/lookup.h b/src/vnet/ip/lookup.h
index 48360b5b..f76ddb37 100644
--- a/src/vnet/ip/lookup.h
+++ b/src/vnet/ip/lookup.h
@@ -55,6 +55,7 @@
 #include <vnet/fib/fib_node.h>
 #include <vnet/dpo/dpo.h>
 #include <vnet/feature/feature.h>
+#include <vnet/rewrite.h>
 
 /** @brief Common (IP4/IP6) next index stored in adjacency. */
 typedef enum