1 files changed, 125 insertions, 0 deletions
diff --git a/src/vnet/mpls/packet.h b/src/vnet/mpls/packet.h
new file mode 100644
index 00000000..bc67445b
--- /dev/null
+++ b/src/vnet/mpls/packet.h
@@ -0,0 +1,125 @@
+#ifndef included_vnet_mpls_packet_h
+#define included_vnet_mpls_packet_h
+
+/*
+ * MPLS packet format
+ *
+ * Copyright (c) 2012 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.
+ */
+
+/**
+ * A label value only, i.e. 20bits.
+ */
+typedef u32 mpls_label_t;
+
+typedef struct {
+    /* Label: top 20 bits [in network byte order] */
+    /* Experimental: 3 bits ... */
+    /* S (bottom of label stack): 1 bit */
+    /* TTL: 8 bits */
+    mpls_label_t label_exp_s_ttl;
+} mpls_unicast_header_t;
+
+typedef enum mpls_eos_bit_t_
+{
+    MPLS_NON_EOS = 0,
+    MPLS_EOS     = 1,
+} mpls_eos_bit_t;
+
+#define MPLS_EOS_BITS {				\
+    [MPLS_NON_EOS] = "neos",		      	\
+    [MPLS_EOS] = "eos",				\
+}
+
+#define FOR_EACH_MPLS_EOS_BIT(_eos) \
+    for (_eos = MPLS_NON_EOS; _eos <= MPLS_EOS; _eos++)
+
+#define MPLS_ENTRY_LABEL_OFFSET        0
+#define MPLS_ENTRY_LABEL_SHIFT 12
+#define MPLS_ENTRY_LABEL_MASK  0x000fffff
+#define MPLS_ENTRY_LABEL_BITS  \
+    (MPLS_ENTRY_LABEL_MASK << MPLS_ENTRY_LABEL_SHIFT)
+
+#define MPLS_ENTRY_EXP_OFFSET   2       /* byte offset to EXP bits */
+#define MPLS_ENTRY_EXP_SHIFT   9
+#define MPLS_ENTRY_EXP_MASK    0x07
+#define MPLS_ENTRY_EXP(mpls)   \
+    (((mpls)>>MPLS_ENTRY_EXP_SHIFT) & MPLS_ENTRY_EXP_MASK)
+#define MPLS_ENTRY_EXP_BITS    \
+    (MPLS_ENTRY_EXP_MASK << MPLS_ENTRY_EXP_SHIFT)
+
+#define MPLS_ENTRY_EOS_OFFSET   2       /* byte offset to EOS bit */
+#define MPLS_ENTRY_EOS_SHIFT   8
+#define MPLS_ENTRY_EOS_MASK    0x01    /* EOS bit in its byte */
+#define        MPLS_ENTRY_EOS(mpls)    \
+    (((mpls) >> MPLS_ENTRY_EOS_SHIFT) & MPLS_ENTRY_EOS_MASK)
+#define MPLS_ENTRY_EOS_BIT     (MPLS_ENTRY_EOS_MASK << MPLS_ENTRY_EOS_SHIFT)
+
+#define MPLS_ENTRY_TTL_OFFSET  3  /* byte offset to ttl field */
+#define MPLS_ENTRY_TTL_SHIFT   0
+#define MPLS_ENTRY_TTL_MASK    0xff
+#define MPLS_ENTRY_TTL(mpls)   \
+    (((mpls) >> MPLS_ENTRY_TTL_SHIFT) & MPLS_ENTRY_TTL_MASK)
+#define MPLS_ENTRY_TTL_BITS    \
+    (MPLS_ENTRY_TTL_MASK << MPLS_ENTRY_TTL_SHIFT)
+
+static inline u32 vnet_mpls_uc_get_label (mpls_label_t label_exp_s_ttl)
+{
+    return (label_exp_s_ttl>>MPLS_ENTRY_LABEL_SHIFT);
+}
+
+static inline u32 vnet_mpls_uc_get_exp (mpls_label_t label_exp_s_ttl)
+{
+    return (MPLS_ENTRY_EXP(label_exp_s_ttl));
+}
+
+static inline u32 vnet_mpls_uc_get_s (mpls_label_t label_exp_s_ttl)
+{
+    return (MPLS_ENTRY_EOS(label_exp_s_ttl));
+}
+
+static inline u32 vnet_mpls_uc_get_ttl (mpls_label_t label_exp_s_ttl)
+{
+    return (MPLS_ENTRY_TTL(label_exp_s_ttl));
+}
+
+static inline void vnet_mpls_uc_set_label (mpls_label_t *label_exp_s_ttl,
+                                           u32 value)
+{
+    *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_LABEL_BITS)) |
+                        ((value  & MPLS_ENTRY_LABEL_MASK) << MPLS_ENTRY_LABEL_SHIFT));
+}
+
+static inline void vnet_mpls_uc_set_exp (mpls_label_t *label_exp_s_ttl,
+                                         u32 exp)
+{
+    *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EXP_BITS)) |
+                        ((exp & MPLS_ENTRY_EXP_MASK) << MPLS_ENTRY_EXP_SHIFT));
+}
+ 
+static inline void vnet_mpls_uc_set_s (mpls_label_t *label_exp_s_ttl,
+                                       u32 eos)
+{
+    *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EOS_BIT)) |
+                        ((eos & MPLS_ENTRY_EOS_MASK) << MPLS_ENTRY_EOS_SHIFT));
+}
+ 
+static inline void vnet_mpls_uc_set_ttl (mpls_label_t *label_exp_s_ttl,
+                                         u32 ttl)
+{
+    *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_TTL_BITS)) |
+                        ((ttl & MPLS_ENTRY_TTL_MASK)));
+}
+
+#endif /* included_vnet_mpls_packet_h */