diff --git a/asm/link_rfu.s b/asm/link_rfu.s
index bbf4905088..adc7e7d827 100644
--- a/asm/link_rfu.s
+++ b/asm/link_rfu.s
@@ -5,159 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_800D30C
-sub_800D30C: @ 800D30C
-	push {r4,lr}
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, 24
-	lsrs r1, 24
-	ldr r4, =gUnknown_03004140
-	ldr r2, [r4, 0x40]
-	cmp r2, 0
-	beq _0800D322
-	bl _call_via_r2
-_0800D322:
-	movs r0, 0
-	strh r0, [r4, 0x16]
-	strh r0, [r4, 0x14]
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_800D30C
-
-	thumb_func_start sub_800D334
-sub_800D334: @ 800D334
-	push {r4,r5,lr}
-	lsls r0, 24
-	lsrs r0, 24
-	ldr r4, =gUnknown_03004140
-	ldrb r5, [r4, 0xE]
-	movs r1, 0x1
-	strb r1, [r4, 0xE]
-	bl rfu_REQ_disconnect
-	bl rfu_waitREQComplete
-	strb r5, [r4, 0xE]
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_800D334
-
-	thumb_func_start sub_800D358
-sub_800D358: @ 800D358
-	push {r4-r7,lr}
-	lsls r0, 24
-	lsrs r5, r0, 24
-	ldr r0, =gUnknown_03007890
-	ldr r0, [r0]
-	ldrb r0, [r0, 0x4]
-	cmp r0, 0
-	beq _0800D3A0
-	movs r4, 0
-_0800D36A:
-	ldr r1, =gUnknown_03007880
-	lsls r0, r4, 2
-	adds r0, r1
-	ldr r2, [r0]
-	ldrh r0, [r2]
-	movs r3, 0x80
-	lsls r3, 8
-	adds r1, r3, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _0800D396
-	ldrb r1, [r2, 0x1A]
-	adds r0, r5, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _0800D396
-	adds r2, r1, 0
-	bics r2, r5
-	movs r0, 0x20
-	adds r1, r4, 0
-	bl rfu_changeSendTarget
-_0800D396:
-	adds r0, r4, 0x1
-	lsls r0, 24
-	lsrs r4, r0, 24
-	cmp r4, 0x3
-	bls _0800D36A
-_0800D3A0:
-	ldr r0, =gUnknown_03007890
-	ldr r0, [r0]
-	ldrb r0, [r0, 0x5]
-	cmp r0, 0
-	beq _0800D3DE
-	movs r4, 0
-_0800D3AC:
-	ldr r1, =gUnknown_03007880
-	lsls r0, r4, 2
-	adds r0, r1
-	ldr r2, [r0]
-	ldrh r0, [r2, 0x34]
-	movs r3, 0x80
-	lsls r3, 8
-	adds r1, r3, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _0800D3D4
-	adds r0, r2, 0
-	adds r0, 0x4E
-	ldrb r0, [r0]
-	ands r0, r5
-	cmp r0, 0
-	beq _0800D3D4
-	adds r0, r4, 0
-	bl rfu_NI_stopReceivingData
-_0800D3D4:
-	adds r0, r4, 0x1
-	lsls r0, 24
-	lsrs r4, r0, 24
-	cmp r4, 0x3
-	bls _0800D3AC
-_0800D3DE:
-	ldr r0, =gUnknown_03007890
-	ldr r3, [r0]
-	ldrb r2, [r3, 0x6]
-	cmp r2, 0
-	beq _0800D41C
-	mvns r1, r5
-	adds r0, r1, 0
-	ands r0, r2
-	strb r0, [r3, 0x6]
-	movs r4, 0
-	ldr r7, =gUnknown_03007870
-	ldr r6, =0x00008024
-_0800D3F6:
-	lsls r0, r4, 2
-	adds r0, r7
-	ldr r2, [r0]
-	ldrh r0, [r2]
-	cmp r0, r6
-	bne _0800D412
-	ldrb r3, [r2, 0x3]
-	adds r0, r5, 0
-	ands r0, r3
-	cmp r0, 0
-	beq _0800D412
-	adds r0, r1, 0
-	ands r0, r3
-	strb r0, [r2, 0x3]
-_0800D412:
-	adds r0, r4, 0x1
-	lsls r0, 24
-	lsrs r4, r0, 24
-	cmp r4, 0x3
-	bls _0800D3F6
-_0800D41C:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_800D358
-
 	thumb_func_start sub_800D434
 sub_800D434: @ 800D434
 	push {r4-r7,lr}
diff --git a/include/librfu.h b/include/librfu.h
index 988ee1c0ec..8d61c25599 100644
--- a/include/librfu.h
+++ b/include/librfu.h
@@ -105,7 +105,10 @@ struct RfuIntrStruct
 
 struct RfuUnk1
 {
-    u8 unk_0[0x14];
+    u16 unk_0;
+    u8 unk_2;
+    u8 unk_3;
+    u8 fill_4[0x10];
     u32 unk_14;
     u32 unk_18;
     struct RfuIntrStruct unk_1c;
@@ -114,9 +117,13 @@ struct RfuUnk1
 struct RfuUnk2
 {
     u16 unk_0;
-    u8 fill_2[0x32];
+    u8 fill_2[0x18];
+    u8 unk_1a;
+    u8 fill_1b[0x19];
     u16 unk_34;
-    u8 fill_36[0x2b];
+    u8 fill_36[0x18];
+    u8 unk_4e;
+    u8 fill_4f[0x12];
     u8 unk_61;
     u8 fill_62[6];
     u32 unk_68;
@@ -132,14 +139,6 @@ struct RfuUnk3
     u32 unk_dc;
 };
 
-struct RfuUnkSub
-{
-    u16 unk_00;
-    u8 unk_02;
-    u16 unk_04;
-    u8 filler_06[26];
-};
-
 struct RfuUnk5
 {
     u8 unk_00;
@@ -152,7 +151,12 @@ struct RfuUnk5
     u8 unk_07;
     u8 unk_08;
     u8 filler_09[11];
-    struct RfuUnkSub unk_14[4];
+    struct RfuUnk5Sub {
+        u16 unk_00;
+        u8 unk_02;
+        u16 unk_04;
+        u8 filler_06[26];
+    } unk_14[4];
 };
 
 extern struct RfuStruct *gRfuState;
@@ -199,3 +203,6 @@ void rfu_clearSlot(u8 a0, u8 a1);
 bool16 rfu_CHILD_getConnectRecoveryStatus(u8 *status);
 bool16 rfu_getConnectParentStatus(u8 *status, u8 *a1);
 bool16 rfu_UNI_PARENT_getDRAC_ACK(u8 *a0);
+void rfu_REQ_disconnect(u8 who);
+void rfu_changeSendTarget(u8 a0, u8 who, u8 a2);
+void rfu_NI_stopReceivingData(u8 who);
diff --git a/include/link_rfu.h b/include/link_rfu.h
index 8634a47069..f82fbd05a5 100644
--- a/include/link_rfu.h
+++ b/include/link_rfu.h
@@ -73,7 +73,7 @@ struct UnkRfuStruct_1 {
     /* 0x032 */ u16 unk_32;
     /* 0x034 */ u16 unk_34[4];
     /* 0x03c */ struct UnkLinkRfuStruct_02022B2C *unk_3c;
-    /* 0x040 */ void (*unk_40)(u8);
+    /* 0x040 */ void (*unk_40)(u8, u8);
     /* 0x044 */ void (*unk_44)(u16);
     /* 0x048 */ u8 filler_48[0xe78];
 };
diff --git a/src/link_rfu.c b/src/link_rfu.c
index 82a68214f6..ffe119a17c 100644
--- a/src/link_rfu.c
+++ b/src/link_rfu.c
@@ -24,20 +24,20 @@ EWRAM_DATA struct UnkLinkRfuStruct_02022B2C gUnknown_02022B2C = {};
 // Static ROM declarations
 
 static void sub_800C000(void);
-void sub_800CEB0(u16 r6);
-void sub_800C7B4(u16 r8, u16 r6);
-void sub_800D30C(u8 a0, u8 a1);
-void sub_800D334(u8 a0);
-void sub_800D610(void);
-void sub_800D630(void);
+static void sub_800C7B4(u16 r8, u16 r6);
 static void sub_800C744(u32 a0);
+void sub_800CEB0(u16 r6);
 static void sub_800CF34(void);
 static void sub_800D158(void);
 static void sub_800D20C(void);
 static void sub_800D268(void);
 static u8 sub_800D294(void);
-void sub_800D358(void);
+void sub_800D30C(u8 a0, u8 a1);
+static void sub_800D334(u8 a0);
+static void sub_800D358(u8 a0);
 void sub_800D434(void);
+void sub_800D610(void);
+void sub_800D630(void);
 
 // .rodata
 
@@ -85,7 +85,7 @@ void rfu_REQ_sendData_wrapper(u8 r2)
     rfu_REQ_sendData(r2);
 }
 
-int sub_800BF4C(void (*func1)(u8), void (*func2)(u16))
+int sub_800BF4C(void (*func1)(u8, u8), void (*func2)(u16))
 {
     if (func1 == NULL)
     {
@@ -613,7 +613,7 @@ static void sub_800C744(u32 a0)
     }
 }
 
-void sub_800C7B4(u16 r8, u16 r6)
+static void sub_800C7B4(u16 r8, u16 r6)
 {
     u8 sp0;
     register u8 *stwiRecvBuffer asm("r0");
@@ -870,7 +870,7 @@ void sub_800C7B4(u16 r8, u16 r6)
             {
                 stwiRecvBuffer = rfu_getSTWIRecvBuffer();
                 gUnknown_03004140.unk_14 = stwiRecvBuffer[8];
-                sub_800D358();
+                sub_800D358(gUnknown_03004140.unk_14);
                 if (gUnknown_03004140.unk_30)
                 {
                     gUnknown_03004140.unk_30 &= ~gUnknown_03004140.unk_14;
@@ -1208,3 +1208,58 @@ static u8 sub_800D294(void)
     }
     return flags;
 }
+
+void sub_800D30C(u8 a0, u8 a1)
+{
+    if (gUnknown_03004140.unk_40 != NULL)
+    {
+        gUnknown_03004140.unk_40(a0, a1);
+    }
+    gUnknown_03004140.unk_14 = gUnknown_03004140.unk_16 = 0;
+}
+
+static void sub_800D334(u8 a0)
+{
+    u8 unk_0e_bak = gUnknown_03004140.unk_0e;
+    gUnknown_03004140.unk_0e = 1;
+    rfu_REQ_disconnect(a0);
+    rfu_waitREQComplete();
+    gUnknown_03004140.unk_0e = unk_0e_bak;
+}
+
+static void sub_800D358(u8 a0)
+{
+    u8 i;
+
+    if (gUnknown_03007890->unk_04)
+    {
+        for (i = 0; i < 4; i++)
+        {
+            if (gUnknown_03007880[i]->unk_0 & 0x8000 && gUnknown_03007880[i]->unk_1a & a0)
+            {
+                rfu_changeSendTarget(0x20, i, gUnknown_03007880[i]->unk_1a & ~a0);
+            }
+        }
+    }
+    if (gUnknown_03007890->unk_05)
+    {
+        for (i = 0; i < 4; i++)
+        {
+            if (gUnknown_03007880[i]->unk_34 & 0x8000 && gUnknown_03007880[i]->unk_4e & a0)
+            {
+                rfu_NI_stopReceivingData(i);
+            }
+        }
+    }
+    if (gUnknown_03007890->unk_06)
+    {
+        gUnknown_03007890->unk_06 &= ~a0;
+        for (i = 0; i < 4; i++)
+        {
+            if (gUnknown_03007870[i]->unk_0 == 0x8024 && a0 & gUnknown_03007870[i]->unk_3)
+            {
+                gUnknown_03007870[i]->unk_3 &= ~a0;
+            }
+        }
+    }
+}