net: rename CNetAddr scopeId to m_scope_id, improve code doc

src/netaddress.cpp

@@ -281,7 +281,7 @@ CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
 CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr, const uint32_t scope)
 {
     SetLegacyIPv6(Span<const uint8_t>(reinterpret_cast<const uint8_t*>(&ipv6Addr), sizeof(ipv6Addr)));
-    scopeId = scope;
+    m_scope_id = scope;
 }
 
 bool CNetAddr::IsBindAny() const
@@ -918,7 +918,7 @@ bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
         memset(paddrin6, 0, *addrlen);
         if (!GetIn6Addr(&paddrin6->sin6_addr))
             return false;
-        paddrin6->sin6_scope_id = scopeId;
+        paddrin6->sin6_scope_id = m_scope_id;
         paddrin6->sin6_family = AF_INET6;
         paddrin6->sin6_port = htons(port);
         return true;

src/netaddress.h

@@ -130,7 +130,11 @@ class CNetAddr
          */
         Network m_net{NET_IPV6};
 
-        uint32_t scopeId{0}; // for scoped/link-local ipv6 addresses
+        /**
+         * Scope id if scoped/link-local IPV6 address.
+         * See https://tools.ietf.org/html/rfc4007
+         */
+        uint32_t m_scope_id{0};
 
     public:
         CNetAddr();
@@ -388,7 +392,7 @@ class CNetAddr
                     "Address too long: %u > %u", address_size, MAX_ADDRV2_SIZE));
             }
 
-            scopeId = 0;
+            m_scope_id = 0;
 
             if (SetNetFromBIP155Network(bip155_net, address_size)) {
                 m_addr.resize(address_size);