From 3102059a9f744855299b57410b6ac8d43ab4a018 Mon Sep 17 00:00:00 2001
From: Florin Coras <fcoras@cisco.com>
Date: Mon, 18 Aug 2025 05:17:19 -0400
Subject: [PATCH] vcl: ldp infra for get/set SO_COOKIE

Stub infrastructure for storing and retrieving SO_COOKIE. Not storing
the actual cookie to avoid increasing vcl session size.

Type: improvement

Change-Id: Ibdcb31eb33ceab9a0250eae94694ba69e4ecf502
Signed-off-by: Florin Coras <fcoras@cisco.com>
---
 src/vcl/ldp.c    |  7 +++++++
 src/vcl/vppcom.c | 23 +++++++++++++++++++++++
 src/vcl/vppcom.h |  2 ++
 3 files changed, 32 insertions(+)

diff --git a/src/vcl/ldp.c b/src/vcl/ldp.c
index ffd7b045de2..1de549b1c4a 100644
--- a/src/vcl/ldp.c
+++ b/src/vcl/ldp.c
@@ -2117,6 +2117,9 @@ getsockopt (int fd, int level, int optname,
 	    case SO_BINDTODEVICE:
 	      rv = 0;
 	      break;
+	    case SO_COOKIE:
+	      rv = vls_attr (vlsh, VPPCOM_ATTR_GET_COOKIE, optval, optlen);
+	      break;
 	    default:
 	      LDBG (0, "ERROR: fd %d: getsockopt SOL_SOCKET: vlsh %u "
 		    "optname %d unsupported!", fd, vlsh, optname);
@@ -2222,6 +2225,10 @@ setsockopt (int fd, int level, int optname,
 	    case SO_LINGER:
 	      rv = 0;
 	      break;
+	    case SO_COOKIE:
+	      rv = vls_attr (vlsh, VPPCOM_ATTR_SET_COOKIE, (void *) optval,
+			     &optlen);
+	      break;
 	    default:
 	      LDBG (0, "ERROR: fd %d: setsockopt SOL_SOCKET: vlsh %u "
 		    "optname %d unsupported!", fd, vlsh, optname);
diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 08879704a01..7b1a5f1cf4c 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -4189,6 +4189,29 @@ vppcom_session_attr (uint32_t session_handle, uint32_t op,
 	rv = VPPCOM_EINVAL;
       break;
 
+    case VPPCOM_ATTR_GET_COOKIE:
+      if (buffer && buflen && (*buflen == sizeof (u64)))
+	{
+	  /* VPP-TBD */
+	  *(u64 *) buffer = 0;
+
+	  VDBG (2, "VPPCOM_ATTR_GET_COOKIE: %d, buflen %d, #VPP-TBD#",
+		*(int *) buffer, *buflen);
+	}
+      else
+	rv = VPPCOM_EINVAL;
+      break;
+
+    case VPPCOM_ATTR_SET_COOKIE:
+      if (buffer && buflen && (*buflen == sizeof (u64)))
+	{
+	  VDBG (2, "VPPCOM_ATTR_SET_COOKIE: %d, buflen %d, #VPP-TBD#",
+		*(u64 *) buffer, *buflen);
+	}
+      else
+	rv = VPPCOM_EINVAL;
+      break;
+
     case VPPCOM_ATTR_GET_V6ONLY:
       if (buffer && buflen && (*buflen >= sizeof (int)))
 	{
diff --git a/src/vcl/vppcom.h b/src/vcl/vppcom.h
index ad1c1f4158f..b88a60384ca 100644
--- a/src/vcl/vppcom.h
+++ b/src/vcl/vppcom.h
@@ -187,6 +187,8 @@ typedef enum
   VPPCOM_ATTR_GET_ORIGINAL_DST,
   VPPCOM_ATTR_GET_NWRITEQ,
   VPPCOM_ATTR_GET_EXT_ENDPT,
+  VPPCOM_ATTR_GET_COOKIE,
+  VPPCOM_ATTR_SET_COOKIE,
 } vppcom_attr_op_t;
 
 typedef struct _vcl_poll
-- 
2.16.6