Merge bitcoin/bitcoin#21506: p2p, refactor: make NetPermissionFlags an enum class

7075f604e8d0b21b2255fa57e20cd365dc10a288 scripted-diff: update noban documentation in net_processing.cpp (Jon Atack)
a95540cf435029f06e56749802d71315ca76b0dd scripted-diff: rename NetPermissionFlags enumerators (Jon Atack)
810d0929c1626bba141af3f779a3c9cd6ece7e75 p2p, refactor: make NetPermissionFlags a uint32 enum class (Jon Atack)
7b55a9449778c5ac89799ce4c607c8c8d797ddfb p2p: NetPermissions::HasFlag() pass flags param by value (Jon Atack)
91f6e6e6d1720e1154ad3f70a5098e9028efa84a scripted-diff: add NetPermissionFlags scopes where not already present (Jon Atack)

Pull request description:

  While reviewing #20196, I noticed the `NetPermissionFlags` enums are frequently called as if they were scoped, yet are still global. This patch upgrades `NetPermissionFlags` to a scoped class enum and updates the enumerator naming, similarly to #19771. See https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#enum-enumerations for more info.

  This change would eliminate the class of bugs like https://github.com/bitcoin/bitcoin/pull/20196#discussion_r610770148 and #21644, as only defined operations on the flags would compile.

ACKs for top commit:
  laanwj:
    Code review ACK 7075f604e8d0b21b2255fa57e20cd365dc10a288
  vasild:
    ACK 7075f604e8d0b21b2255fa57e20cd365dc10a288

Tree-SHA512: 7fcea66ee499f059efc78c934b5f729b3c8573fe304dee2c27c837c2f662b89324790568246d75b2a574cf9f059b42d3551d928996862f4358055eb43521e6f4

9 files changed, 126 insertions, 118 deletions

diff --git a/src/net.cpp b/src/net.cpp
index 05588d7406..909b7622e3 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1005,7 +1005,7 @@ bool CConnman::AttemptToEvictConnection()
 
         LOCK(cs_vNodes);
         for (const CNode* node : vNodes) {
-            if (node->HasPermission(PF_NOBAN))
+            if (node->HasPermission(NetPermissionFlags::NoBan))
                 continue;
             if (!node->IsInboundConn())
                 continue;
@@ -1062,7 +1062,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
 
     const CAddress addr_bind = GetBindAddress(hSocket);
 
-    NetPermissionFlags permissionFlags = NetPermissionFlags::PF_NONE;
+    NetPermissionFlags permissionFlags = NetPermissionFlags::None;
     hListenSocket.AddSocketPermissionFlags(permissionFlags);
 
     CreateNodeFromAcceptedSocket(hSocket, permissionFlags, addr_bind, addr);
@@ -1077,12 +1077,12 @@ void CConnman::CreateNodeFromAcceptedSocket(SOCKET hSocket,
     int nMaxInbound = nMaxConnections - m_max_outbound;
 
     AddWhitelistPermissionFlags(permissionFlags, addr);
-    if (NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::PF_ISIMPLICIT)) {
-        NetPermissions::ClearFlag(permissionFlags, PF_ISIMPLICIT);
-        if (gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) NetPermissions::AddFlag(permissionFlags, PF_FORCERELAY);
-        if (gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)) NetPermissions::AddFlag(permissionFlags, PF_RELAY);
-        NetPermissions::AddFlag(permissionFlags, PF_MEMPOOL);
-        NetPermissions::AddFlag(permissionFlags, PF_NOBAN);
+    if (NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::Implicit)) {
+        NetPermissions::ClearFlag(permissionFlags, NetPermissionFlags::Implicit);
+        if (gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) NetPermissions::AddFlag(permissionFlags, NetPermissionFlags::ForceRelay);
+        if (gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)) NetPermissions::AddFlag(permissionFlags, NetPermissionFlags::Relay);
+        NetPermissions::AddFlag(permissionFlags, NetPermissionFlags::Mempool);
+        NetPermissions::AddFlag(permissionFlags, NetPermissionFlags::NoBan);
     }
 
     {
@@ -1111,7 +1111,7 @@ void CConnman::CreateNodeFromAcceptedSocket(SOCKET hSocket,
 
     // Don't accept connections from banned peers.
     bool banned = m_banman && m_banman->IsBanned(addr);
-    if (!NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::PF_NOBAN) && banned)
+    if (!NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::NoBan) && banned)
     {
         LogPrint(BCLog::NET, "connection from %s dropped (banned)\n", addr.ToString());
         CloseSocket(hSocket);
@@ -1120,7 +1120,7 @@ void CConnman::CreateNodeFromAcceptedSocket(SOCKET hSocket,
 
     // Only accept connections from discouraged peers if our inbound slots aren't (almost) full.
     bool discouraged = m_banman && m_banman->IsDiscouraged(addr);
-    if (!NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::PF_NOBAN) && nInbound + 1 >= nMaxInbound && discouraged)
+    if (!NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::NoBan) && nInbound + 1 >= nMaxInbound && discouraged)
     {
         LogPrint(BCLog::NET, "connection from %s dropped (discouraged)\n", addr.ToString());
         CloseSocket(hSocket);
@@ -1141,7 +1141,7 @@ void CConnman::CreateNodeFromAcceptedSocket(SOCKET hSocket,
     uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
 
     ServiceFlags nodeServices = nLocalServices;
-    if (NetPermissions::HasFlag(permissionFlags, PF_BLOOMFILTER)) {
+    if (NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::BloomFilter)) {
         nodeServices = static_cast<ServiceFlags>(nodeServices | NODE_BLOOM);
     }
 
@@ -2253,7 +2253,7 @@ void CConnman::ThreadI2PAcceptIncoming()
             continue;
         }
 
-        CreateNodeFromAcceptedSocket(conn.sock->Release(), NetPermissionFlags::PF_NONE,
+        CreateNodeFromAcceptedSocket(conn.sock->Release(), NetPermissionFlags::None,
                                      CAddress{conn.me, NODE_NONE}, CAddress{conn.peer, NODE_NONE});
     }
 }
@@ -2411,7 +2411,7 @@ bool CConnman::Bind(const CService &addr, unsigned int flags, NetPermissionFlags
         return false;
     }
 
-    if (addr.IsRoutable() && fDiscover && !(flags & BF_DONT_ADVERTISE) && !NetPermissions::HasFlag(permissions, NetPermissionFlags::PF_NOBAN)) {
+    if (addr.IsRoutable() && fDiscover && !(flags & BF_DONT_ADVERTISE) && !NetPermissions::HasFlag(permissions, NetPermissionFlags::NoBan)) {
         AddLocal(addr, LOCAL_BIND);
     }
 
@@ -2425,7 +2425,7 @@ bool CConnman::InitBinds(
 {
     bool fBound = false;
     for (const auto& addrBind : binds) {
-        fBound |= Bind(addrBind, (BF_EXPLICIT | BF_REPORT_ERROR), NetPermissionFlags::PF_NONE);
+        fBound |= Bind(addrBind, (BF_EXPLICIT | BF_REPORT_ERROR), NetPermissionFlags::None);
     }
     for (const auto& addrBind : whiteBinds) {
         fBound |= Bind(addrBind.m_service, (BF_EXPLICIT | BF_REPORT_ERROR), addrBind.m_flags);
@@ -2434,12 +2434,12 @@ bool CConnman::InitBinds(
         struct in_addr inaddr_any;
         inaddr_any.s_addr = htonl(INADDR_ANY);
         struct in6_addr inaddr6_any = IN6ADDR_ANY_INIT;
-        fBound |= Bind(CService(inaddr6_any, GetListenPort()), BF_NONE, NetPermissionFlags::PF_NONE);
-        fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE, NetPermissionFlags::PF_NONE);
+        fBound |= Bind(CService(inaddr6_any, GetListenPort()), BF_NONE, NetPermissionFlags::None);
+        fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE, NetPermissionFlags::None);
     }
 
     for (const auto& addr_bind : onion_binds) {
-        fBound |= Bind(addr_bind, BF_EXPLICIT | BF_DONT_ADVERTISE, NetPermissionFlags::PF_NONE);
+        fBound |= Bind(addr_bind, BF_EXPLICIT | BF_DONT_ADVERTISE, NetPermissionFlags::None);
     }
 
     return fBound;
diff --git a/src/net.h b/src/net.h
index 6b9a7ef136..65b262e573 100644
--- a/src/net.h
+++ b/src/net.h
@@ -402,7 +402,7 @@ public:
     std::unique_ptr<TransportDeserializer> m_deserializer;
     std::unique_ptr<TransportSerializer> m_serializer;
 
-    NetPermissionFlags m_permissionFlags{PF_NONE};
+    NetPermissionFlags m_permissionFlags{NetPermissionFlags::None};
     std::atomic<ServiceFlags> nServices{NODE_NONE};
     SOCKET hSocket GUARDED_BY(cs_hSocket);
     /** Total size of all vSendMsg entries */
diff --git a/src/net_permissions.cpp b/src/net_permissions.cpp
index 1fdcd97593..228453df20 100644
--- a/src/net_permissions.cpp
+++ b/src/net_permissions.cpp
@@ -23,12 +23,12 @@ namespace {
 // The parse the following format "perm1,perm2@xxxxxx"
 bool TryParsePermissionFlags(const std::string str, NetPermissionFlags& output, size_t& readen, bilingual_str& error)
 {
-    NetPermissionFlags flags = PF_NONE;
+    NetPermissionFlags flags = NetPermissionFlags::None;
     const auto atSeparator = str.find('@');
 
     // if '@' is not found (ie, "xxxxx"), the caller should apply implicit permissions
     if (atSeparator == std::string::npos) {
-        NetPermissions::AddFlag(flags, PF_ISIMPLICIT);
+        NetPermissions::AddFlag(flags, NetPermissionFlags::Implicit);
         readen = 0;
     }
     // else (ie, "perm1,perm2@xxxxx"), let's enumerate the permissions by splitting by ',' and calculate the flags
@@ -44,14 +44,14 @@ bool TryParsePermissionFlags(const std::string str, NetPermissionFlags& output,
             readen += len; // We read "perm1"
             if (commaSeparator != std::string::npos) readen++; // We read ","
 
-            if (permission == "bloomfilter" || permission == "bloom") NetPermissions::AddFlag(flags, PF_BLOOMFILTER);
-            else if (permission == "noban") NetPermissions::AddFlag(flags, PF_NOBAN);
-            else if (permission == "forcerelay") NetPermissions::AddFlag(flags, PF_FORCERELAY);
-            else if (permission == "mempool") NetPermissions::AddFlag(flags, PF_MEMPOOL);
-            else if (permission == "download") NetPermissions::AddFlag(flags, PF_DOWNLOAD);
-            else if (permission == "all") NetPermissions::AddFlag(flags, PF_ALL);
-            else if (permission == "relay") NetPermissions::AddFlag(flags, PF_RELAY);
-            else if (permission == "addr") NetPermissions::AddFlag(flags, PF_ADDR);
+            if (permission == "bloomfilter" || permission == "bloom") NetPermissions::AddFlag(flags, NetPermissionFlags::BloomFilter);
+            else if (permission == "noban") NetPermissions::AddFlag(flags, NetPermissionFlags::NoBan);
+            else if (permission == "forcerelay") NetPermissions::AddFlag(flags, NetPermissionFlags::ForceRelay);
+            else if (permission == "mempool") NetPermissions::AddFlag(flags, NetPermissionFlags::Mempool);
+            else if (permission == "download") NetPermissions::AddFlag(flags, NetPermissionFlags::Download);
+            else if (permission == "all") NetPermissions::AddFlag(flags, NetPermissionFlags::All);
+            else if (permission == "relay") NetPermissions::AddFlag(flags, NetPermissionFlags::Relay);
+            else if (permission == "addr") NetPermissions::AddFlag(flags, NetPermissionFlags::Addr);
             else if (permission.length() == 0); // Allow empty entries
             else {
                 error = strprintf(_("Invalid P2P permission: '%s'"), permission);
@@ -71,13 +71,13 @@ bool TryParsePermissionFlags(const std::string str, NetPermissionFlags& output,
 std::vector<std::string> NetPermissions::ToStrings(NetPermissionFlags flags)
 {
     std::vector<std::string> strings;
-    if (NetPermissions::HasFlag(flags, PF_BLOOMFILTER)) strings.push_back("bloomfilter");
-    if (NetPermissions::HasFlag(flags, PF_NOBAN)) strings.push_back("noban");
-    if (NetPermissions::HasFlag(flags, PF_FORCERELAY)) strings.push_back("forcerelay");
-    if (NetPermissions::HasFlag(flags, PF_RELAY)) strings.push_back("relay");
-    if (NetPermissions::HasFlag(flags, PF_MEMPOOL)) strings.push_back("mempool");
-    if (NetPermissions::HasFlag(flags, PF_DOWNLOAD)) strings.push_back("download");
-    if (NetPermissions::HasFlag(flags, PF_ADDR)) strings.push_back("addr");
+    if (NetPermissions::HasFlag(flags, NetPermissionFlags::BloomFilter)) strings.push_back("bloomfilter");
+    if (NetPermissions::HasFlag(flags, NetPermissionFlags::NoBan)) strings.push_back("noban");
+    if (NetPermissions::HasFlag(flags, NetPermissionFlags::ForceRelay)) strings.push_back("forcerelay");
+    if (NetPermissions::HasFlag(flags, NetPermissionFlags::Relay)) strings.push_back("relay");
+    if (NetPermissions::HasFlag(flags, NetPermissionFlags::Mempool)) strings.push_back("mempool");
+    if (NetPermissions::HasFlag(flags, NetPermissionFlags::Download)) strings.push_back("download");
+    if (NetPermissions::HasFlag(flags, NetPermissionFlags::Addr)) strings.push_back("addr");
     return strings;
 }
 
diff --git a/src/net_permissions.h b/src/net_permissions.h
index 142b317bf6..7a158aa6c5 100644
--- a/src/net_permissions.h
+++ b/src/net_permissions.h
@@ -5,6 +5,7 @@
 #include <netaddress.h>
 
 #include <string>
+#include <type_traits>
 #include <vector>
 
 #ifndef BITCOIN_NET_PERMISSIONS_H
@@ -14,52 +15,59 @@ struct bilingual_str;
 
 extern const std::vector<std::string> NET_PERMISSIONS_DOC;
 
-enum NetPermissionFlags {
-    PF_NONE = 0,
+enum class NetPermissionFlags : uint32_t {
+    None = 0,
     // Can query bloomfilter even if -peerbloomfilters is false
-    PF_BLOOMFILTER = (1U << 1),
+    BloomFilter = (1U << 1),
     // Relay and accept transactions from this peer, even if -blocksonly is true
     // This peer is also not subject to limits on how many transaction INVs are tracked
-    PF_RELAY = (1U << 3),
+    Relay = (1U << 3),
     // Always relay transactions from this peer, even if already in mempool
     // Keep parameter interaction: forcerelay implies relay
-    PF_FORCERELAY = (1U << 2) | PF_RELAY,
+    ForceRelay = (1U << 2) | Relay,
     // Allow getheaders during IBD and block-download after maxuploadtarget limit
-    PF_DOWNLOAD = (1U << 6),
+    Download = (1U << 6),
     // Can't be banned/disconnected/discouraged for misbehavior
-    PF_NOBAN = (1U << 4) | PF_DOWNLOAD,
+    NoBan = (1U << 4) | Download,
     // Can query the mempool
-    PF_MEMPOOL = (1U << 5),
+    Mempool = (1U << 5),
     // Can request addrs without hitting a privacy-preserving cache
-    PF_ADDR = (1U << 7),
+    Addr = (1U << 7),
 
     // True if the user did not specifically set fine grained permissions
-    PF_ISIMPLICIT = (1U << 31),
-    PF_ALL = PF_BLOOMFILTER | PF_FORCERELAY | PF_RELAY | PF_NOBAN | PF_MEMPOOL | PF_DOWNLOAD | PF_ADDR,
+    Implicit = (1U << 31),
+    All = BloomFilter | ForceRelay | Relay | NoBan | Mempool | Download | Addr,
 };
+static inline constexpr NetPermissionFlags operator|(NetPermissionFlags a, NetPermissionFlags b)
+{
+    using t = typename std::underlying_type<NetPermissionFlags>::type;
+    return static_cast<NetPermissionFlags>(static_cast<t>(a) | static_cast<t>(b));
+}
 
 class NetPermissions
 {
 public:
     NetPermissionFlags m_flags;
     static std::vector<std::string> ToStrings(NetPermissionFlags flags);
-    static inline bool HasFlag(const NetPermissionFlags& flags, NetPermissionFlags f)
+    static inline bool HasFlag(NetPermissionFlags flags, NetPermissionFlags f)
     {
-        return (flags & f) == f;
+        using t = typename std::underlying_type<NetPermissionFlags>::type;
+        return (static_cast<t>(flags) & static_cast<t>(f)) == static_cast<t>(f);
     }
     static inline void AddFlag(NetPermissionFlags& flags, NetPermissionFlags f)
     {
-        flags = static_cast<NetPermissionFlags>(flags | f);
+        flags = flags | f;
     }
-    //! ClearFlag is only called with `f` == NetPermissionFlags::PF_ISIMPLICIT.
+    //! ClearFlag is only called with `f` == NetPermissionFlags::Implicit.
     //! If that should change in the future, be aware that ClearFlag should not
-    //! be called with a subflag of a multiflag, e.g. NetPermissionFlags::PF_RELAY
-    //! or NetPermissionFlags::PF_DOWNLOAD, as that would leave `flags` in an
+    //! be called with a subflag of a multiflag, e.g. NetPermissionFlags::Relay
+    //! or NetPermissionFlags::Download, as that would leave `flags` in an
     //! invalid state corresponding to none of the existing flags.
     static inline void ClearFlag(NetPermissionFlags& flags, NetPermissionFlags f)
     {
-        assert(f == NetPermissionFlags::PF_ISIMPLICIT);
-        flags = static_cast<NetPermissionFlags>(flags & ~f);
+        assert(f == NetPermissionFlags::Implicit);
+        using t = typename std::underlying_type<NetPermissionFlags>::type;
+        flags = static_cast<NetPermissionFlags>(static_cast<t>(flags) & ~static_cast<t>(f));
     }
 };
 
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 27ad9eefb5..fdd36835c2 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -124,11 +124,11 @@ static constexpr auto AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL = 24h;
 /** Average delay between peer address broadcasts */
 static constexpr auto AVG_ADDRESS_BROADCAST_INTERVAL = 30s;
 /** Average delay between trickled inventory transmissions for inbound peers.
- *  Blocks and peers with noban permission bypass this. */
+ *  Blocks and peers with NetPermissionFlags::NoBan permission bypass this. */
 static constexpr auto INBOUND_INVENTORY_BROADCAST_INTERVAL = 5s;
 /** Average delay between trickled inventory transmissions for outbound peers.
  *  Use a smaller delay as there is less privacy concern for them.
- *  Blocks and peers with noban permission bypass this. */
+ *  Blocks and peers with NetPermissionFlags::NoBan permission bypass this. */
 static constexpr auto OUTBOUND_INVENTORY_BROADCAST_INTERVAL = 2s;
 /** Maximum rate of inventory items to send per second.
  *  Limits the impact of low-fee transaction floods. */
@@ -183,7 +183,7 @@ struct Peer {
     Mutex m_misbehavior_mutex;
     /** Accumulated misbehavior score for this peer */
     int m_misbehavior_score GUARDED_BY(m_misbehavior_mutex){0};
-    /** Whether this peer should be disconnected and marked as discouraged (unless it has the noban permission). */
+    /** Whether this peer should be disconnected and marked as discouraged (unless it has NetPermissionFlags::NoBan permission). */
     bool m_should_discourage GUARDED_BY(m_misbehavior_mutex){false};
 
     /** Protects block inventory data members */
@@ -680,7 +680,7 @@ static void UpdatePreferredDownload(const CNode& node, CNodeState* state) EXCLUS
     nPreferredDownload -= state->fPreferredDownload;
 
     // Whether this node should be marked as a preferred download node.
-    state->fPreferredDownload = (!node.IsInboundConn() || node.HasPermission(PF_NOBAN)) && !node.IsAddrFetchConn() && !node.fClient;
+    state->fPreferredDownload = (!node.IsInboundConn() || node.HasPermission(NetPermissionFlags::NoBan)) && !node.IsAddrFetchConn() && !node.fClient;
 
     nPreferredDownload += state->fPreferredDownload;
 }
@@ -960,24 +960,24 @@ void PeerManagerImpl::AddTxAnnouncement(const CNode& node, const GenTxid& gtxid,
 {
     AssertLockHeld(::cs_main); // For m_txrequest
     NodeId nodeid = node.GetId();
-    if (!node.HasPermission(PF_RELAY) && m_txrequest.Count(nodeid) >= MAX_PEER_TX_ANNOUNCEMENTS) {
+    if (!node.HasPermission(NetPermissionFlags::Relay) && m_txrequest.Count(nodeid) >= MAX_PEER_TX_ANNOUNCEMENTS) {
         // Too many queued announcements from this peer
         return;
     }
     const CNodeState* state = State(nodeid);
 
     // Decide the TxRequestTracker parameters for this announcement:
-    // - "preferred": if fPreferredDownload is set (= outbound, or PF_NOBAN permission)
+    // - "preferred": if fPreferredDownload is set (= outbound, or NetPermissionFlags::NoBan permission)
     // - "reqtime": current time plus delays for:
     //   - NONPREF_PEER_TX_DELAY for announcements from non-preferred connections
     //   - TXID_RELAY_DELAY for txid announcements while wtxid peers are available
     //   - OVERLOADED_PEER_TX_DELAY for announcements from peers which have at least
-    //     MAX_PEER_TX_REQUEST_IN_FLIGHT requests in flight (and don't have PF_RELAY).
+    //     MAX_PEER_TX_REQUEST_IN_FLIGHT requests in flight (and don't have NetPermissionFlags::Relay).
     auto delay = std::chrono::microseconds{0};
     const bool preferred = state->fPreferredDownload;
     if (!preferred) delay += NONPREF_PEER_TX_DELAY;
     if (!gtxid.IsWtxid() && m_wtxid_relay_peers > 0) delay += TXID_RELAY_DELAY;
-    const bool overloaded = !node.HasPermission(PF_RELAY) &&
+    const bool overloaded = !node.HasPermission(NetPermissionFlags::Relay) &&
         m_txrequest.CountInFlight(nodeid) >= MAX_PEER_TX_REQUEST_IN_FLIGHT;
     if (overloaded) delay += OVERLOADED_PEER_TX_DELAY;
     m_txrequest.ReceivedInv(nodeid, gtxid, preferred, current_time + delay);
@@ -1637,14 +1637,14 @@ void PeerManagerImpl::ProcessGetBlockData(CNode& pfrom, Peer& peer, const CInv&
     // disconnect node in case we have reached the outbound limit for serving historical blocks
     if (m_connman.OutboundTargetReached(true) &&
         (((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.IsMsgFilteredBlk()) &&
-        !pfrom.HasPermission(PF_DOWNLOAD) // nodes with the download permission may exceed target
+        !pfrom.HasPermission(NetPermissionFlags::Download) // nodes with the download permission may exceed target
     ) {
         LogPrint(BCLog::NET, "historical block serving limit reached, disconnect peer=%d\n", pfrom.GetId());
         pfrom.fDisconnect = true;
         return;
     }
     // Avoid leaking prune-height by never sending blocks below the NODE_NETWORK_LIMITED threshold
-    if (!pfrom.HasPermission(PF_NOBAN) && (
+    if (!pfrom.HasPermission(NetPermissionFlags::NoBan) && (
             (((pfrom.GetLocalServices() & NODE_NETWORK_LIMITED) == NODE_NETWORK_LIMITED) && ((pfrom.GetLocalServices() & NODE_NETWORK) != NODE_NETWORK) && (m_chainman.ActiveChain().Tip()->nHeight - pindex->nHeight > (int)NODE_NETWORK_LIMITED_MIN_BLOCKS + 2 /* add two blocks buffer extension for possible races */) )
        )) {
         LogPrint(BCLog::NET, "Ignore block request below NODE_NETWORK_LIMITED threshold, disconnect peer=%d\n", pfrom.GetId());
@@ -2738,7 +2738,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         bool fBlocksOnly = m_ignore_incoming_txs || (pfrom.m_tx_relay == nullptr);
 
         // Allow peers with relay permission to send data other than blocks in blocks only mode
-        if (pfrom.HasPermission(PF_RELAY)) {
+        if (pfrom.HasPermission(NetPermissionFlags::Relay)) {
             fBlocksOnly = false;
         }
 
@@ -2952,7 +2952,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         }
 
         LOCK(cs_main);
-        if (m_chainman.ActiveChainstate().IsInitialBlockDownload() && !pfrom.HasPermission(PF_DOWNLOAD)) {
+        if (m_chainman.ActiveChainstate().IsInitialBlockDownload() && !pfrom.HasPermission(NetPermissionFlags::Download)) {
             LogPrint(BCLog::NET, "Ignoring getheaders from peer=%d because node is in initial block download\n", pfrom.GetId());
             return;
         }
@@ -3011,7 +3011,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         // Stop processing the transaction early if
         // 1) We are in blocks only mode and peer has no relay permission
         // 2) This peer is a block-relay-only peer
-        if ((m_ignore_incoming_txs && !pfrom.HasPermission(PF_RELAY)) || (pfrom.m_tx_relay == nullptr))
+        if ((m_ignore_incoming_txs && !pfrom.HasPermission(NetPermissionFlags::Relay)) || (pfrom.m_tx_relay == nullptr))
         {
             LogPrint(BCLog::NET, "transaction sent in violation of protocol peer=%d\n", pfrom.GetId());
             pfrom.fDisconnect = true;
@@ -3056,7 +3056,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         // (older than our recency filter) if trying to DoS us, without any need
         // for witness malleation.
         if (AlreadyHaveTx(GenTxid(/* is_wtxid=*/true, wtxid))) {
-            if (pfrom.HasPermission(PF_FORCERELAY)) {
+            if (pfrom.HasPermission(NetPermissionFlags::ForceRelay)) {
                 // Always relay transactions received from peers with forcerelay
                 // permission, even if they were already in the mempool, allowing
                 // the node to function as a gateway for nodes hidden behind it.
@@ -3585,7 +3585,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
 
         pfrom.vAddrToSend.clear();
         std::vector<CAddress> vAddr;
-        if (pfrom.HasPermission(PF_ADDR)) {
+        if (pfrom.HasPermission(NetPermissionFlags::Addr)) {
             vAddr = m_connman.GetAddresses(MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND);
         } else {
             vAddr = m_connman.GetAddresses(pfrom, MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND);
@@ -3598,9 +3598,9 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
     }
 
     if (msg_type == NetMsgType::MEMPOOL) {
-        if (!(pfrom.GetLocalServices() & NODE_BLOOM) && !pfrom.HasPermission(PF_MEMPOOL))
+        if (!(pfrom.GetLocalServices() & NODE_BLOOM) && !pfrom.HasPermission(NetPermissionFlags::Mempool))
         {
-            if (!pfrom.HasPermission(PF_NOBAN))
+            if (!pfrom.HasPermission(NetPermissionFlags::NoBan))
             {
                 LogPrint(BCLog::NET, "mempool request with bloom filters disabled, disconnect peer=%d\n", pfrom.GetId());
                 pfrom.fDisconnect = true;
@@ -3608,9 +3608,9 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
             return;
         }
 
-        if (m_connman.OutboundTargetReached(false) && !pfrom.HasPermission(PF_MEMPOOL))
+        if (m_connman.OutboundTargetReached(false) && !pfrom.HasPermission(NetPermissionFlags::Mempool))
         {
-            if (!pfrom.HasPermission(PF_NOBAN))
+            if (!pfrom.HasPermission(NetPermissionFlags::NoBan))
             {
                 LogPrint(BCLog::NET, "mempool request with bandwidth limit reached, disconnect peer=%d\n", pfrom.GetId());
                 pfrom.fDisconnect = true;
@@ -3825,8 +3825,8 @@ bool PeerManagerImpl::MaybeDiscourageAndDisconnect(CNode& pnode, Peer& peer)
         peer.m_should_discourage = false;
     } // peer.m_misbehavior_mutex
 
-    if (pnode.HasPermission(PF_NOBAN)) {
-        // We never disconnect or discourage peers for bad behavior if they have the NOBAN permission flag
+    if (pnode.HasPermission(NetPermissionFlags::NoBan)) {
+        // We never disconnect or discourage peers for bad behavior if they have NetPermissionFlags::NoBan permission
         LogPrintf("Warning: not punishing noban peer %d!\n", peer.m_id);
         return false;
     }
@@ -4463,7 +4463,7 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
         if (pto->m_tx_relay != nullptr) {
                 LOCK(pto->m_tx_relay->cs_tx_inventory);
                 // Check whether periodic sends should happen
-                bool fSendTrickle = pto->HasPermission(PF_NOBAN);
+                bool fSendTrickle = pto->HasPermission(NetPermissionFlags::NoBan);
                 if (pto->m_tx_relay->nNextInvSend < current_time) {
                     fSendTrickle = true;
                     if (pto->IsInboundConn()) {
@@ -4620,12 +4620,12 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
             // Detect whether this is a stalling initial-headers-sync peer
             if (pindexBestHeader->GetBlockTime() <= GetAdjustedTime() - 24 * 60 * 60) {
                 if (current_time > state.m_headers_sync_timeout && nSyncStarted == 1 && (nPreferredDownload - state.fPreferredDownload >= 1)) {
-                    // Disconnect a peer (without the noban permission) if it is our only sync peer,
+                    // Disconnect a peer (without NetPermissionFlags::NoBan permission) if it is our only sync peer,
                     // and we have others we could be using instead.
                     // Note: If all our peers are inbound, then we won't
                     // disconnect our sync peer for stalling; we have bigger
                     // problems if we can't get any outbound peers.
-                    if (!pto->HasPermission(PF_NOBAN)) {
+                    if (!pto->HasPermission(NetPermissionFlags::NoBan)) {
                         LogPrintf("Timeout downloading headers from peer=%d, disconnecting\n", pto->GetId());
                         pto->fDisconnect = true;
                         return true;
@@ -4712,7 +4712,7 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
             !m_ignore_incoming_txs &&
             pto->GetCommonVersion() >= FEEFILTER_VERSION &&
             gArgs.GetBoolArg("-feefilter", DEFAULT_FEEFILTER) &&
-            !pto->HasPermission(PF_FORCERELAY) // peers with the forcerelay permission should not filter txs to us
+            !pto->HasPermission(NetPermissionFlags::ForceRelay) // peers with the forcerelay permission should not filter txs to us
         ) {
             CAmount currentFilter = m_mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
             static FeeFilterRounder g_filter_rounder{CFeeRate{DEFAULT_MIN_RELAY_TX_FEE}};
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
index 731d6a4eef..eed73e8ce3 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -1062,7 +1062,7 @@ void RPCConsole::updateDetailWidget()
     ui->peerSubversion->setText(QString::fromStdString(stats->nodeStats.cleanSubVer));
     ui->peerConnectionType->setText(GUIUtil::ConnectionTypeToQString(stats->nodeStats.m_conn_type, /* prepend_direction */ true));
     ui->peerNetwork->setText(GUIUtil::NetworkToQString(stats->nodeStats.m_network));
-    if (stats->nodeStats.m_permissionFlags == PF_NONE) {
+    if (stats->nodeStats.m_permissionFlags == NetPermissionFlags::None) {
         ui->peerPermissions->setText(ts.na);
     } else {
         QStringList permissions;
diff --git a/src/test/fuzz/net_permissions.cpp b/src/test/fuzz/net_permissions.cpp
index 6fdf4b653c..6ea79464d0 100644
--- a/src/test/fuzz/net_permissions.cpp
+++ b/src/test/fuzz/net_permissions.cpp
@@ -25,7 +25,7 @@ FUZZ_TARGET(net_permissions)
         (void)NetPermissions::ToStrings(net_whitebind_permissions.m_flags);
         (void)NetPermissions::AddFlag(net_whitebind_permissions.m_flags, net_permission_flags);
         assert(NetPermissions::HasFlag(net_whitebind_permissions.m_flags, net_permission_flags));
-        (void)NetPermissions::ClearFlag(net_whitebind_permissions.m_flags, NetPermissionFlags::PF_ISIMPLICIT);
+        (void)NetPermissions::ClearFlag(net_whitebind_permissions.m_flags, NetPermissionFlags::Implicit);
         (void)NetPermissions::ToStrings(net_whitebind_permissions.m_flags);
     }
 
@@ -35,7 +35,7 @@ FUZZ_TARGET(net_permissions)
         (void)NetPermissions::ToStrings(net_whitelist_permissions.m_flags);
         (void)NetPermissions::AddFlag(net_whitelist_permissions.m_flags, net_permission_flags);
         assert(NetPermissions::HasFlag(net_whitelist_permissions.m_flags, net_permission_flags));
-        (void)NetPermissions::ClearFlag(net_whitelist_permissions.m_flags, NetPermissionFlags::PF_ISIMPLICIT);
+        (void)NetPermissions::ClearFlag(net_whitelist_permissions.m_flags, NetPermissionFlags::Implicit);
         (void)NetPermissions::ToStrings(net_whitelist_permissions.m_flags);
     }
 }
diff --git a/src/test/netbase_tests.cpp b/src/test/netbase_tests.cpp
index b316a37c6e..3c47cf83e2 100644
--- a/src/test/netbase_tests.cpp
+++ b/src/test/netbase_tests.cpp
@@ -381,27 +381,27 @@ BOOST_AUTO_TEST_CASE(netpermissions_test)
     // If no permission flags, assume backward compatibility
     BOOST_CHECK(NetWhitebindPermissions::TryParse("1.2.3.4:32", whitebindPermissions, error));
     BOOST_CHECK(error.empty());
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_ISIMPLICIT);
-    BOOST_CHECK(NetPermissions::HasFlag(whitebindPermissions.m_flags, PF_ISIMPLICIT));
-    NetPermissions::ClearFlag(whitebindPermissions.m_flags, PF_ISIMPLICIT);
-    BOOST_CHECK(!NetPermissions::HasFlag(whitebindPermissions.m_flags, PF_ISIMPLICIT));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_NONE);
-    NetPermissions::AddFlag(whitebindPermissions.m_flags, PF_ISIMPLICIT);
-    BOOST_CHECK(NetPermissions::HasFlag(whitebindPermissions.m_flags, PF_ISIMPLICIT));
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::Implicit);
+    BOOST_CHECK(NetPermissions::HasFlag(whitebindPermissions.m_flags, NetPermissionFlags::Implicit));
+    NetPermissions::ClearFlag(whitebindPermissions.m_flags, NetPermissionFlags::Implicit);
+    BOOST_CHECK(!NetPermissions::HasFlag(whitebindPermissions.m_flags, NetPermissionFlags::Implicit));
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::None);
+    NetPermissions::AddFlag(whitebindPermissions.m_flags, NetPermissionFlags::Implicit);
+    BOOST_CHECK(NetPermissions::HasFlag(whitebindPermissions.m_flags, NetPermissionFlags::Implicit));
 
     // Can set one permission
     BOOST_CHECK(NetWhitebindPermissions::TryParse("bloom@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_BLOOMFILTER);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::BloomFilter);
     BOOST_CHECK(NetWhitebindPermissions::TryParse("@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_NONE);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::None);
 
     NetWhitebindPermissions noban, noban_download, download_noban, download;
 
     // "noban" implies "download"
     BOOST_REQUIRE(NetWhitebindPermissions::TryParse("noban@1.2.3.4:32", noban, error));
-    BOOST_CHECK_EQUAL(noban.m_flags, NetPermissionFlags::PF_NOBAN);
-    BOOST_CHECK(NetPermissions::HasFlag(noban.m_flags, NetPermissionFlags::PF_DOWNLOAD));
-    BOOST_CHECK(NetPermissions::HasFlag(noban.m_flags, NetPermissionFlags::PF_NOBAN));
+    BOOST_CHECK_EQUAL(noban.m_flags, NetPermissionFlags::NoBan);
+    BOOST_CHECK(NetPermissions::HasFlag(noban.m_flags, NetPermissionFlags::Download));
+    BOOST_CHECK(NetPermissions::HasFlag(noban.m_flags, NetPermissionFlags::NoBan));
 
     // "noban,download" is equivalent to "noban"
     BOOST_REQUIRE(NetWhitebindPermissions::TryParse("noban,download@1.2.3.4:32", noban_download, error));
@@ -413,31 +413,31 @@ BOOST_AUTO_TEST_CASE(netpermissions_test)
 
     // "download" excludes (does not imply) "noban"
     BOOST_REQUIRE(NetWhitebindPermissions::TryParse("download@1.2.3.4:32", download, error));
-    BOOST_CHECK_EQUAL(download.m_flags, NetPermissionFlags::PF_DOWNLOAD);
-    BOOST_CHECK(NetPermissions::HasFlag(download.m_flags, NetPermissionFlags::PF_DOWNLOAD));
-    BOOST_CHECK(!NetPermissions::HasFlag(download.m_flags, NetPermissionFlags::PF_NOBAN));
+    BOOST_CHECK_EQUAL(download.m_flags, NetPermissionFlags::Download);
+    BOOST_CHECK(NetPermissions::HasFlag(download.m_flags, NetPermissionFlags::Download));
+    BOOST_CHECK(!NetPermissions::HasFlag(download.m_flags, NetPermissionFlags::NoBan));
 
     // Happy path, can parse flags
     BOOST_CHECK(NetWhitebindPermissions::TryParse("bloom,forcerelay@1.2.3.4:32", whitebindPermissions, error));
     // forcerelay should also activate the relay permission
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_BLOOMFILTER | PF_FORCERELAY | PF_RELAY);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::BloomFilter | NetPermissionFlags::ForceRelay | NetPermissionFlags::Relay);
     BOOST_CHECK(NetWhitebindPermissions::TryParse("bloom,relay,noban@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_BLOOMFILTER | PF_RELAY | PF_NOBAN);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::BloomFilter | NetPermissionFlags::Relay | NetPermissionFlags::NoBan);
     BOOST_CHECK(NetWhitebindPermissions::TryParse("bloom,forcerelay,noban@1.2.3.4:32", whitebindPermissions, error));
     BOOST_CHECK(NetWhitebindPermissions::TryParse("all@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_ALL);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::All);
 
     // Allow dups
     BOOST_CHECK(NetWhitebindPermissions::TryParse("bloom,relay,noban,noban@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_BLOOMFILTER | PF_RELAY | PF_NOBAN | PF_DOWNLOAD); // "noban" implies "download"
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::BloomFilter | NetPermissionFlags::Relay | NetPermissionFlags::NoBan | NetPermissionFlags::Download); // "noban" implies "download"
 
     // Allow empty
     BOOST_CHECK(NetWhitebindPermissions::TryParse("bloom,relay,,noban@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_BLOOMFILTER | PF_RELAY | PF_NOBAN);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::BloomFilter | NetPermissionFlags::Relay | NetPermissionFlags::NoBan);
     BOOST_CHECK(NetWhitebindPermissions::TryParse(",@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_NONE);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::None);
     BOOST_CHECK(NetWhitebindPermissions::TryParse(",,@1.2.3.4:32", whitebindPermissions, error));
-    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, PF_NONE);
+    BOOST_CHECK_EQUAL(whitebindPermissions.m_flags, NetPermissionFlags::None);
 
     // Detect invalid flag
     BOOST_CHECK(!NetWhitebindPermissions::TryParse("bloom,forcerelay,oopsie@1.2.3.4:32", whitebindPermissions, error));
@@ -449,16 +449,16 @@ BOOST_AUTO_TEST_CASE(netpermissions_test)
 
     // Happy path for whitelist parsing
     BOOST_CHECK(NetWhitelistPermissions::TryParse("noban@1.2.3.4", whitelistPermissions, error));
-    BOOST_CHECK_EQUAL(whitelistPermissions.m_flags, PF_NOBAN);
-    BOOST_CHECK(NetPermissions::HasFlag(whitelistPermissions.m_flags, NetPermissionFlags::PF_NOBAN));
+    BOOST_CHECK_EQUAL(whitelistPermissions.m_flags, NetPermissionFlags::NoBan);
+    BOOST_CHECK(NetPermissions::HasFlag(whitelistPermissions.m_flags, NetPermissionFlags::NoBan));
 
     BOOST_CHECK(NetWhitelistPermissions::TryParse("bloom,forcerelay,noban,relay@1.2.3.4/32", whitelistPermissions, error));
-    BOOST_CHECK_EQUAL(whitelistPermissions.m_flags, PF_BLOOMFILTER | PF_FORCERELAY | PF_NOBAN | PF_RELAY);
+    BOOST_CHECK_EQUAL(whitelistPermissions.m_flags, NetPermissionFlags::BloomFilter | NetPermissionFlags::ForceRelay | NetPermissionFlags::NoBan | NetPermissionFlags::Relay);
     BOOST_CHECK(error.empty());
     BOOST_CHECK_EQUAL(whitelistPermissions.m_subnet.ToString(), "1.2.3.4/32");
     BOOST_CHECK(NetWhitelistPermissions::TryParse("bloom,forcerelay,noban,relay,mempool@1.2.3.4/32", whitelistPermissions, error));
 
-    const auto strings = NetPermissions::ToStrings(PF_ALL);
+    const auto strings = NetPermissions::ToStrings(NetPermissionFlags::All);
     BOOST_CHECK_EQUAL(strings.size(), 7U);
     BOOST_CHECK(std::find(strings.begin(), strings.end(), "bloomfilter") != strings.end());
     BOOST_CHECK(std::find(strings.begin(), strings.end(), "forcerelay") != strings.end());
diff --git a/src/test/util/net.h b/src/test/util/net.h
index 9268d60a1e..71685d437a 100644
--- a/src/test/util/net.h
+++ b/src/test/util/net.h
@@ -46,16 +46,16 @@ constexpr ServiceFlags ALL_SERVICE_FLAGS[]{
 };
 
 constexpr NetPermissionFlags ALL_NET_PERMISSION_FLAGS[]{
-    NetPermissionFlags::PF_NONE,
-    NetPermissionFlags::PF_BLOOMFILTER,
-    NetPermissionFlags::PF_RELAY,
-    NetPermissionFlags::PF_FORCERELAY,
-    NetPermissionFlags::PF_NOBAN,
-    NetPermissionFlags::PF_MEMPOOL,
-    NetPermissionFlags::PF_ADDR,
-    NetPermissionFlags::PF_DOWNLOAD,
-    NetPermissionFlags::PF_ISIMPLICIT,
-    NetPermissionFlags::PF_ALL,
+    NetPermissionFlags::None,
+    NetPermissionFlags::BloomFilter,
+    NetPermissionFlags::Relay,
+    NetPermissionFlags::ForceRelay,
+    NetPermissionFlags::NoBan,
+    NetPermissionFlags::Mempool,
+    NetPermissionFlags::Addr,
+    NetPermissionFlags::Download,
+    NetPermissionFlags::Implicit,
+    NetPermissionFlags::All,
 };
 
 constexpr ConnectionType ALL_CONNECTION_TYPES[]{