diff --git a/cafe/nn_nets2.def b/cafe/nn_nets2.def
index fcbbf12a3..a995d5a4d 100644
--- a/cafe/nn_nets2.def
+++ b/cafe/nn_nets2.def
@@ -11,4 +11,6 @@ icmp_close_handle
 icmp_create_handle
 icmp_last_code_type
 icmp_ping
+
+:TEXT_WRAP
 somemopt
diff --git a/include/nn/nets2.h b/include/nn/nets2.h
new file mode 100644
index 000000000..8c26f84d8
--- /dev/null
+++ b/include/nn/nets2.h
@@ -0,0 +1,8 @@
+#pragma once
+
+/**
+ * \defgroup nn_nets2 nn_nets2
+ * Network functions 2.
+ */
+
+#include <nn/nets2/somemopt.h>
diff --git a/include/nn/nets2/somemopt.h b/include/nn/nets2/somemopt.h
new file mode 100644
index 000000000..7105c3eb0
--- /dev/null
+++ b/include/nn/nets2/somemopt.h
@@ -0,0 +1,68 @@
+#pragma once
+#include <wut.h>
+
+/**
+ * \defgroup nn_nets2_somemopt
+ * \ingroup nn_nets2
+ * User provided socket memory options.
+ * @{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum SOMemOptRequest
+{
+   //! Initialize buffer managment from user-provided buffer.
+   //! This is a blocking request, which only returns once nsysnet is shut down/the application quits.
+   SOMEMOPT_REQUEST_INIT           = 1,
+   //! Return the amount of bytes used for buffer management.
+   SOMEMOPT_REQUEST_GET_BYTES_USED = 2,
+   //! Wait for buffer management initialization to be done.
+   SOMEMOPT_REQUEST_WAIT_FOR_INIT  = 3,
+   //! Cancel pending wait for init.
+   SOMEMOPT_REQUEST_CANCEL_WAIT    = 4,
+} SOMemOptRequest;
+
+typedef enum SOMemOptFlags
+{
+   SOMEMOPT_FLAGS_NONE        = 0,
+   //! Changes the distribution between small and big buffers to 50-50 instead of 80-20.
+   SOMEMOPT_FLAGS_BIG_BUFFERS = 1 << 0,
+} SOMemOptFlags;
+
+/**
+ * Perform a somemopt request.
+ * 
+ * \param request
+ * The request to perform.
+ * 
+ * \param buffer
+ * A 0x40 aligned buffer for \link SOMEMOPT_REQUEST_INIT \endlink.
+ * 
+ * \param size
+ * The size of the buffer for \link SOMEMOPT_REQUEST_INIT \endlink.
+ * Minimum size is \c 0x20000 bytes, maximum size is \c 0x300000.
+ * 
+ * \param flags
+ * A combination of flags.
+ * 
+ * \return
+ * -1 on error.
+ */
+int
+somemopt(SOMemOptRequest request,
+         void *buffer,
+         uint32_t size,
+         SOMemOptFlags flags);
+
+int
+RPLWRAP(somemopt)(SOMemOptRequest request,
+                  void *buffer,
+                  uint32_t size,
+                  SOMemOptFlags flags);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/include/sys/socket.h b/include/sys/socket.h
index 1609c596f..08161cde2 100644
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -51,7 +51,7 @@
 #define SO_UNKNOWN101A  0x101A      // tcp related
 #define SO_UNKNOWN101B  0x101B      // tcp related
 #define SO_NOSLOWSTART  0x4000      // disable slowstart
-#define SO_RUSRBUF      0x10000     // ?
+#define SO_RUSRBUF      0x10000     // enable somemopt provided memory for receive buffer
 
 typedef uint32_t socklen_t;
 typedef uint16_t sa_family_t;
diff --git a/libraries/wutsocket/somemopt.c b/libraries/wutsocket/somemopt.c
new file mode 100644
index 000000000..866f35563
--- /dev/null
+++ b/libraries/wutsocket/somemopt.c
@@ -0,0 +1,13 @@
+#include "wut_socket.h"
+
+#include <nn/nets2.h>
+
+int
+somemopt(SOMemOptRequest request,
+         void *buffer,
+         uint32_t size,
+         SOMemOptFlags flags)
+{
+   int rc = RPLWRAP(somemopt)(request, buffer, size, flags);
+   return __wut_get_nsysnet_result(NULL, rc);
+}
diff --git a/tests/test_compile_headers_common/test_compile_headers_list.h b/tests/test_compile_headers_common/test_compile_headers_list.h
index 8baeae44e..3fdc5b25c 100644
--- a/tests/test_compile_headers_common/test_compile_headers_list.h
+++ b/tests/test_compile_headers_common/test_compile_headers_list.h
@@ -102,6 +102,7 @@
 #include <nn/ccr/sys_caffeine.h>
 #include <nn/cmpt/cmpt.h>
 #include <nn/ffl/miidata.h>
+#include <nn/nets2/somemopt.h>
 #include <nn/nfp/nfp_cpp.h>
 #include <nn/nfp/amiibo_settings_cpp.h>
 #include <nn/pdm/pdm_c.h>
@@ -116,6 +117,7 @@
 #include <nn/cmpt.h>
 #include <nn/result.h>
 #include <nn/sl.h>
+#include <nn/nets2.h>
 #include <nn/nfp.h>
 #include <nn/pdm.h>
 #include <nn/swkbd.h>