From 2e7fbcc08152da5c6a17ed80ba08cd37edec6c8c Mon Sep 17 00:00:00 2001
From: Neale Ranns <nranns@cisco.com>
Date: Wed, 15 Mar 2017 04:22:25 -0700
Subject: 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>
---
 src/vnet/adj/adj.c       |  2 +-
 src/vnet/adj/adj_mcast.c | 11 ++++++++++-
 src/vnet/adj/adj_mcast.h | 11 ++++++++++-
 3 files changed, 21 insertions(+), 3 deletions(-)

(limited to 'src/vnet/adj')

diff --git a/src/vnet/adj/adj.c b/src/vnet/adj/adj.c
index f3d483ac13f..9a01e89d660 100644
--- a/src/vnet/adj/adj.c
+++ b/src/vnet/adj/adj.c
@@ -360,7 +360,7 @@ adj_get_sw_if_index (adj_index_t ai)
 }
 
 /**
- * @brief Return the link type of the adjacency
+ * @brief Return the rewrite string of the adjacency
  */
 const u8*
 adj_get_rewrite (adj_index_t ai)
diff --git a/src/vnet/adj/adj_mcast.c b/src/vnet/adj/adj_mcast.c
index a3ba4d6ab18..4f678e43e80 100644
--- a/src/vnet/adj/adj_mcast.c
+++ b/src/vnet/adj/adj_mcast.c
@@ -100,7 +100,9 @@ adj_mcast_add_or_lock (fib_protocol_t proto,
  */
 void
 adj_mcast_update_rewrite (adj_index_t adj_index,
-                          u8 *rewrite)
+                          u8 *rewrite,
+                          u8 offset,
+                          u32 mask)
 {
     ip_adjacency_t *adj;
 
@@ -118,6 +120,13 @@ adj_mcast_update_rewrite (adj_index_t adj_index,
                                         vnet_get_main(),
                                         adj->rewrite_header.sw_if_index),
                                     rewrite);
+    /*
+     * set the fields corresponding to the mcast IP address rewrite
+     * The mask must be stored in network byte order, since the packet's
+     * IP address will also be in network order.
+     */
+    adj->rewrite_header.dst_mcast_offset = offset;
+    adj->rewrite_header.dst_mcast_mask = clib_host_to_net_u32(mask);
 }
 
 void
diff --git a/src/vnet/adj/adj_mcast.h b/src/vnet/adj/adj_mcast.h
index 21c5a1417dd..40d44313357 100644
--- a/src/vnet/adj/adj_mcast.h
+++ b/src/vnet/adj/adj_mcast.h
@@ -55,9 +55,18 @@ extern adj_index_t adj_mcast_add_or_lock(fib_protocol_t proto,
  *
  * @param
  *  The new rewrite
+ *
+ * @param
+ *  The offset in the rewrite a which to write in packet's
+ *  IP Address
+ *
+ * @param
+ *  The mask to apply to the packet berfore the rewrite.
  */
 extern void adj_mcast_update_rewrite(adj_index_t adj_index,
-                                     u8 *rewrite);
+                                     u8 *rewrite,
+                                     u8 offset,
+                                     u32 mask);
 
 /**
  * @brief Format/display a mcast adjacency.
-- 
cgit 1.2.3-korg