[YANG] Add srv6 yang model and unit tests

src/sonic-yang-models/doc/Configuration.md

@@ -1,5 +1,6 @@
 # SONiC Configuration Database Manual
 
+
 **Table of Contents**
 
 * [Introduction](#introduction)
@@ -90,6 +91,7 @@
   * [SYSTEM_DEFAULTS table](#systemdefaults-table)
   * [RADIUS](#radius)
   * [Static DNS](#static-dns)
+  * [SRv6](#srv6)
 * [For Developers](#for-developers)
   * [Generating Application Config by Jinja2 Template](#generating-application-config-by-jinja2-template)
   * [Incremental Configuration by Subscribing to ConfigDB](#incremental-configuration-by-subscribing-to-configdb)
@@ -2868,6 +2870,23 @@ The DNS_NAMESERVER table introduces static DNS nameservers configuration.
 }
 ```
 
+### SRv6
+
+The **SRV6_MY_SID_TABLE** introduces Segment Routing over IPv6 configuration.
+An example is as follows:
+```
+{
+    "SRV6_MY_SID_TABLE" : {
+        "FCBB:BBBB:20::" : {
+           "action": "uN"
+        },
+        "FCBB:BBBB:20:F1::" : {
+           "action": "uDT46"
+        }
+    }
+}
+```
+
 ### FIPS
 
 The FIPS table introduces FIPS  configuration.

src/sonic-yang-models/tests/yang_model_tests/tests/srv6.json

@@ -0,0 +1,25 @@
+{
+    "SRV6_MY_SID_VALID": {
+        "desc": "Valid config"
+    },
+    "SRV6_MY_SID_INVALID_IP_ADDR": {
+        "desc": "SID configured with invalid IPv6 address",
+        "eStrKey" : "InvalidValue",
+        "eStr": ["ip_address"]
+    },
+    "SRV6_MY_SID_INVALID_ACTION": {
+        "desc": "SID configured with invalid action",
+        "eStrKey" : "InvalidValue",
+        "eStr": ["action"]
+    },
+    "SRV6_MY_SID_DSCP_MODE_WITH_UN": {
+        "desc": "SID configured with dscp_mode and uN action",
+        "eStrKey" : "When",
+        "eStr": ["action"]
+    },
+    "SRV6_MY_SID_INVALID_FUNC_LEN": {
+        "desc": "SID configured with invalid func_len",
+        "eStrKey" : "Must",
+        "eStr": ["func_len"]
+    }
+}

src/sonic-yang-models/tests/yang_model_tests/tests_config/srv6.json

@@ -0,0 +1,89 @@
+{
+    "SRV6_MY_SID_VALID": {
+        "sonic-srv6:sonic-srv6": {
+            "sonic-srv6:SRV6_MY_SID_TABLE": {
+                "SRV6_MY_SID_TABLE_LIST": [
+                    {
+                        "ip_address": "FCBB:BBBB:20::",
+                        "action": "uN"
+                    },
+                    {
+                        "ip_address": "FCBB:BBBB:20:F1:",
+                        "action": "uDT46"
+                    },
+                    {
+                        "ip_address": "FCBB:BBBB:20:F2:",
+                        "action": "uDT6",
+                        "dscp_mode": "pipe"
+                    }
+                ]
+            }
+        }
+    },
+    "SRV6_MY_SID_INVALID_IP_ADDR": {
+        "sonic-srv6:sonic-srv6": {
+            "sonic-srv6:SRV6_MY_SID_TABLE": {
+                "SRV6_MY_SID_TABLE_LIST": [
+                    {
+                        "ip_address": "FCBB:BBBB:200001::",
+                        "action": "uN"
+                    },
+                    {
+                        "ip_address": "FCBB:BBBB:20:F1:",
+                        "action": "uDT46"
+                    }
+                ]
+            }
+        }
+    },
+    "SRV6_MY_SID_INVALID_ACTION": {
+        "sonic-srv6:sonic-srv6": {
+            "sonic-srv6:SRV6_MY_SID_TABLE": {
+                "SRV6_MY_SID_TABLE_LIST": [
+                    {
+                        "ip_address": "FCBB:BBBB:20::",
+                        "action": "End.A"
+                    },
+                    {
+                        "ip_address": "FCBB:BBBB:20:F1:",
+                        "action": "uDT46"
+                    }
+                ]
+            }
+        }
+    },
+    "SRV6_MY_SID_DSCP_MODE_WITH_UN": {
+        "sonic-srv6:sonic-srv6": {
+            "sonic-srv6:SRV6_MY_SID_TABLE": {
+                "SRV6_MY_SID_TABLE_LIST": [
+                    {
+                        "ip_address": "FCBB:BBBB:20::",
+                        "action": "uN",
+                        "dscp_mode": "uniform"
+                    },
+                    {
+                        "ip_address": "FCBB:BBBB:20:F1:",
+                        "action": "uDT46"
+                    }
+                ]
+            }
+        }
+    },
+    "SRV6_MY_SID_INVALID_FUNC_LEN": {
+        "sonic-srv6:sonic-srv6": {
+            "sonic-srv6:SRV6_MY_SID_TABLE": {
+                "SRV6_MY_SID_TABLE_LIST": [
+                    {
+                        "ip_address": "FCBB:BBBB:20::",
+                        "func_len": 127,
+                        "action": "uN"
+                    },
+                    {
+                        "ip_address": "FCBB:BBBB:20:F1:",
+                        "action": "uDT46"
+                    }
+                ]
+            }
+        }
+    }
+}

src/sonic-yang-models/yang-models/sonic-srv6.yang

@@ -0,0 +1,96 @@
+module sonic-srv6 {
+    namespace "http://github.com/sonic-net/sonic-srv6";
+    prefix srv6;
+    yang-version 1.1;
+
+    import ietf-yang-types {
+		prefix yang;
+	}
+
+	import ietf-inet-types {
+		prefix inet;
+	}
+
+    import sonic-vrf {
+		prefix vrf;
+	}
+
+    revision 2024-12-05 {
+		description
+			"Initial revision.";
+	}
+
+    container sonic-srv6 {
+
+        container SRV6_MY_SID_TABLE {
+            list SRV6_MY_SID_TABLE_LIST {
+                key "ip_address";
+
+                leaf ip_address {
+                    type inet:ipv6-address;
+                }
+
+                leaf block_len {
+                    type uint8 {
+                        range "1..128";
+                    }
+
+                    default 32;
+                }
+
+                leaf node_len {
+                    type uint8 {
+                        range "1..128";
+                    }
+
+                    default 16;
+                }
+
+                leaf func_len {
+                    type uint8 {
+                        range "1..128";
+                    }
+
+                    default 16;
+                }
+
+                leaf arg_len {
+                    type uint8 {
+                        range "0..128";
+                    }
+
+                    default 0;
+                }
+
+                leaf action {
+                    type enumeration {
+                        enum uN;
+                        enum uDT46;
+                    }
+                }
+
+                leaf vrf {
+                    type leafref {
+                        path "/vrf:sonic-vrf/vrf:VRF/vrf:VRF_LIST/vrf:name";
+                    }
+                    description "VRF name";
+
+                    default "default";
+                }
+
+                leaf dscp_mode {
+                    type enumeration {
+                        enum uniform;
+                        enum pipe;
+                    }
+                    when "../action = 'uDT46'";
+                }
+
+                must 'block_len + node_len + func_len + arg_len <= 128' {
+                    error-message "The sum of all fields' length must be less than or equal to 128";
+                }
+            }
+        }
+
+    }
+}