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-rw-r--r--src/vnet/rewrite.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/src/vnet/rewrite.h b/src/vnet/rewrite.h
index 00c1efbdc5e..ce2bce3a3c8 100644
--- a/src/vnet/rewrite.h
+++ b/src/vnet/rewrite.h
@@ -64,6 +64,16 @@ typedef CLIB_PACKED (struct {
Used for MTU check after packet rewrite. */
u16 max_l3_packet_bytes;
+ /* When dynamically writing a multicast destination L2 addresss
+ * this is the offset within the address to start writing n
+ * bytes of the IP mcast address */
+ u8 dst_mcast_offset;
+
+ /* When dynamically writing a multicast destination L2 addresss
+ * this is the number of bytes of the dest IP address to write into
+ * the MAC rewrite */
+ u8 dst_mcast_n_bytes;
+
/* Rewrite string starting at end and going backwards. */
u8 data[0];
}) vnet_rewrite_header_t;
@@ -261,6 +271,27 @@ _vnet_rewrite_two_headers (vnet_rewrite_header_t * h0,
sizeof ((rw0).rewrite_data), \
(most_likely_size))
+always_inline void
+_vnet_fixup_one_header (vnet_rewrite_header_t * h0,
+ u8 * addr, u32 addr_len,
+ u8 * packet0, int clear_first_bit)
+{
+ /* location to write to in the packet */
+ u8 *p0 = packet0 - h0->dst_mcast_offset;
+ u8 *p1 = p0;
+ /* location to write from in the L3 dest address */
+ u8 *a0 = addr + addr_len - h0->dst_mcast_n_bytes;
+
+ clib_memcpy (p0, a0, h0->dst_mcast_n_bytes);
+ if (clear_first_bit)
+ *p1 &= 0x7f;
+}
+
+#define vnet_fixup_one_header(rw0,addr,p0,clear_first_bit) \
+ _vnet_fixup_one_header (&((rw0).rewrite_header), \
+ (u8*)(addr), sizeof((*addr)), \
+ (u8*)(p0), (clear_first_bit))
+
#define VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST ((void *) 0)
/** Deprecated */
void vnet_rewrite_for_sw_interface (struct vnet_main_t *vnm,