Added SLL pseudo protocol header.

src/sll.cpp

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2012, Nasel
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following disclaimer
+ *   in the documentation and/or other materials provided with the
+ *   distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <stdexcept>
+#include <cstring>
+#include "sll.h"
+#include "internals.h"
+
+namespace Tins {
+SLL::SLL() : _header() {
+    
+}
+    
+SLL::SLL(const uint8_t *buffer, uint32_t total_sz) {
+    const char *err_msg = "Not enough size for a SLL header";
+    if(total_sz < sizeof(_header))
+        throw std::runtime_error(err_msg);
+    std::memcpy(&_header, buffer, sizeof(_header));
+    buffer += sizeof(_header);
+    total_sz -= sizeof(_header);
+    if(total_sz) {
+        inner_pdu(
+            Internals::pdu_from_flag(
+                (Constants::Ethernet::e)protocol(), 
+                buffer, 
+                total_sz
+            )
+        );
+    }
+}
+
+void SLL::packet_type(uint16_t new_packet_type) {
+    _header.packet_type = Endian::host_to_be(new_packet_type);
+}
+
+void SLL::lladdr_type(uint16_t new_lladdr_type) {
+    _header.lladdr_type = Endian::host_to_be(new_lladdr_type);
+}
+
+void SLL::lladdr_len(uint16_t new_lladdr_len) {
+    _header.lladdr_len = Endian::host_to_be(new_lladdr_len);
+}
+
+void SLL::address(const address_type &new_address) {
+    new_address.copy(_header.address);
+}
+
+void SLL::protocol(uint16_t new_protocol) {
+    _header.protocol = Endian::host_to_be(new_protocol);
+}
+
+uint32_t SLL::header_size() const {
+    return sizeof(_header);
+}
+
+void SLL::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *) {
+    if(inner_pdu()) {
+        Constants::Ethernet::e flag = Internals::pdu_flag_to_ether_type(
+            inner_pdu()->pdu_type()
+        );
+        protocol(static_cast<uint16_t>(flag));
+    }
+    std::memcpy(buffer, &_header, sizeof(_header));
+}
+}