Added AddressRange class template.

src/internals.cpp

@@ -39,6 +39,8 @@
 #include "rawpdu.h"
 #include "dot1q.h"
 #include "pppoe.h"
+#include "ip_address.h"
+#include "ipv6_address.h"
 
 using std::string;
 
@@ -149,5 +151,45 @@ Constants::Ethernet::e pdu_flag_to_ether_type(PDU::PDUType flag) {
             return Constants::Ethernet::UNKNOWN;
     }
 }
+
+bool increment(IPv4Address &addr) {
+    uint32_t addr_int = Endian::be_to_host<uint32_t>(addr);
+    bool reached_end = ++addr_int == 0xffffffff;
+    addr = IPv4Address(Endian::be_to_host<uint32_t>(addr_int));
+    return reached_end;
 }
+
+bool increment(IPv6Address &addr) {
+    IPv6Address::iterator it = addr.end() - 1;
+    while(it >= addr.begin() && *it == 0xff) {
+        *it = 0;
+        --it;
+    }
+    // reached end
+    if(it < addr.begin())
+        return true;
+    (*it)++;
+    return false;
 }
+
+bool decrement(IPv4Address &addr) {
+    uint32_t addr_int = Endian::be_to_host<uint32_t>(addr);
+    bool reached_end = --addr_int == 0;
+    addr = IPv4Address(Endian::be_to_host<uint32_t>(addr_int));
+    return reached_end;
+}
+
+bool decrement(IPv6Address &addr) {
+    IPv6Address::iterator it = addr.end() - 1;
+    while(it >= addr.begin() && *it == 0) {
+        *it = 0xff;
+        --it;
+    }
+    // reached end
+    if(it < addr.begin())
+        return true;
+    (*it)--;
+    return false;
+}
+} // namespace Internals
+} // namespace Tins

src/ip_address.cpp

@@ -31,6 +31,7 @@
 #include <sstream>
 #include "ip_address.h"
 #include "endianness.h"
+#include "address_range.h"
 
 using std::string;
 
@@ -94,4 +95,13 @@ std::ostream &operator<<(std::ostream &output, const IPv4Address &addr) {
     }
     return output;;
 }
+
+AddressRange<IPv4Address> operator/(const IPv4Address &addr, int mask) {
+    if(mask > 32)
+        throw std::logic_error("Prefix length cannot exceed 32");
+    return AddressRange<IPv4Address>::from_mask(
+        addr, 
+        IPv4Address(Endian::host_to_be(0xffffffff << (32 - mask)))
+    );
+}
 }

src/ipv6_address.cpp

@@ -41,6 +41,7 @@
 #include <limits>
 #include <sstream>
 #include "ipv6_address.h"
+#include "address_range.h"
 
 namespace Tins {
     IPv6Address::IPv6Address() {
@@ -96,6 +97,19 @@ namespace Tins {
         #endif
         return buffer;
     }
-    
+
+    AddressRange<IPv6Address> operator/(const IPv6Address &addr, int mask) {
+        if(mask > 128)
+            throw std::logic_error("Prefix length cannot exceed 128");
+        IPv6Address last_addr;
+        IPv6Address::iterator it = last_addr.begin();
+        while(mask > 8) {
+            *it = 0xff;
+            ++it;
+            mask -= 8;
+        }
+        *it = 0xff << (8 - mask);
+        return AddressRange<IPv6Address>::from_mask(addr, last_addr);
+    }
 }