From 5b9f4d4129c2f4e523b1fad584aee513bb37c8f5 Mon Sep 17 00:00:00 2001
From: PabloMK7 <hackyglitch2@gmail.com>
Date: Wed, 2 Aug 2023 22:06:51 +0200
Subject: [PATCH] SOC: Fix setting TTL to default value when TTL = 0 (#6835)

---
 src/core/hle/service/soc/soc_u.cpp | 6 +++++-
 src/core/hle/service/soc/soc_u.h   | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/core/hle/service/soc/soc_u.cpp b/src/core/hle/service/soc/soc_u.cpp
index 1b91fdaae..f07dffafb 100644
--- a/src/core/hle/service/soc/soc_u.cpp
+++ b/src/core/hle/service/soc/soc_u.cpp
@@ -301,7 +301,7 @@ std::pair<int, int> SOC_U::TranslateSockOpt(int level, int opt) {
     return std::make_pair(SOL_SOCKET, opt);
 }
 
-static void TranslateSockOptDataToPlatform(std::vector<u8>& out, const std::vector<u8>& in,
+void SOC_U::TranslateSockOptDataToPlatform(std::vector<u8>& out, const std::vector<u8>& in,
                                            int platform_level, int platform_opt) {
     // linger structure may be different between 3DS and platform
     if (platform_level == SOL_SOCKET && platform_opt == SO_LINGER &&
@@ -331,6 +331,10 @@ static void TranslateSockOptDataToPlatform(std::vector<u8>& out, const std::vect
         out = in;
         return;
     }
+    // Setting TTL to 0 means resetting it to the default value.
+    if (platform_level == IPPROTO_IP && platform_opt == IP_TTL && value == 0) {
+        value = SOC_TTL_DEFAULT;
+    }
     out.resize(sizeof(int));
     std::memcpy(out.data(), &value, sizeof(int));
 }
diff --git a/src/core/hle/service/soc/soc_u.h b/src/core/hle/service/soc/soc_u.h
index 4c56d3152..56329e1ed 100644
--- a/src/core/hle/service/soc/soc_u.h
+++ b/src/core/hle/service/soc/soc_u.h
@@ -61,8 +61,12 @@ private:
     static constexpr u32 SOC_SOL_CONFIG = 0xFFFE;
     static constexpr u32 SOC_SOL_SOCKET = 0xFFFF;
 
+    static constexpr int SOC_TTL_DEFAULT = 64;
+
     static const std::unordered_map<u64, std::pair<int, int>> sockopt_map;
     static std::pair<int, int> TranslateSockOpt(int level, int opt);
+    static void TranslateSockOptDataToPlatform(std::vector<u8>& out, const std::vector<u8>& in,
+                                               int platform_level, int platform_opt);
     bool GetSocketBlocking(const SocketHolder& socket_holder);
     u32 SetSocketBlocking(SocketHolder& socket_holder, bool blocking);