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[cooja] plugins/analyzers/IPHCPacketAnalyzer: Full port decompression for UDP header compression

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This commit is contained in:
Enrico Joerns 2014-06-19 04:26:30 +02:00
parent a88328c8db
commit 3b60d96f39
1 changed files with 30 additions and 24 deletions
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54
tools/cooja/java/org/contikios/cooja/plugins/analyzers/IPHCPacketAnalyzer.java
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@ -4,8 +4,10 @@ import org.contikios.cooja.util.StringUtils;
public class IPHCPacketAnalyzer extends PacketAnalyzer {
public final static int SICSLOWPAN_UDP_PORT_MIN = 0xF0B0;
public final static int SICSLOWPAN_UDP_PORT_MAX = 0xF0BF; /* F0B0 + 15 */
public final static int SICSLOWPAN_UDP_4_BIT_PORT_MIN = 0xF0B0;
public final static int SICSLOWPAN_UDP_4_BIT_PORT_MAX = 0xF0BF; /* F0B0 + 15 */
public final static int SICSLOWPAN_UDP_8_BIT_PORT_MIN = 0xF000;
public final static int SICSLOWPAN_UDP_8_BIT_PORT_MAX = 0xF0FF; /* F000 + 255 */
public final static int SICSLOWPAN_DISPATCH_IPV6 = 0x41; /* 01000001 = 65 */
public final static int SICSLOWPAN_DISPATCH_HC1 = 0x42; /* 01000010 = 66 */
@ -44,8 +46,10 @@ public class IPHCPacketAnalyzer extends PacketAnalyzer {
private static final int SICSLOWPAN_NDC_UDP_MASK = 0xf8;
private static final int SICSLOWPAN_NHC_UDP_ID = 0xf0;
private static final int SICSLOWPAN_NHC_UDP_C = 0xf3;
private static final int SICSLOWPAN_NHC_UDP_I = 0xf0;
private static final int SICSLOWPAN_NHC_UDP_00 = 0xf0;
private static final int SICSLOWPAN_NHC_UDP_01 = 0xf1;
private static final int SICSLOWPAN_NHC_UDP_10 = 0xf2;
private static final int SICSLOWPAN_NHC_UDP_11 = 0xf3;
public final static int PROTO_UDP = 17;
public final static int PROTO_TCP = 6;
@ -373,29 +377,31 @@ public class IPHCPacketAnalyzer extends PacketAnalyzer {
/* The next header is compressed, NHC is following */
if ((packet.get(hc06_ptr) & SICSLOWPAN_NDC_UDP_MASK) == SICSLOWPAN_NHC_UDP_ID) {
proto = PROTO_UDP;
switch (packet.get(hc06_ptr)) {
case (byte) SICSLOWPAN_NHC_UDP_C:
/* 1 byte for NHC, 1 byte for ports, 2 bytes chksum */
srcPort = SICSLOWPAN_UDP_PORT_MIN + (packet.get(hc06_ptr + 1) >> 4);
destPort = SICSLOWPAN_UDP_PORT_MIN + (packet.get(hc06_ptr + 1) & 0x0F);
// memcpy(&SICSLOWPAN_UDP_BUF->udpchksum, hc06_ptr + 2, 2);
// PRINTF("IPHC: Uncompressed UDP ports (4): %x, %x\n",
// SICSLOWPAN_UDP_BUF->srcport, SICSLOWPAN_UDP_BUF->destport);
hc06_ptr += 4;
break;
case (byte) SICSLOWPAN_NHC_UDP_I:
switch (packet.get(hc06_ptr) & (byte) SICSLOWPAN_NHC_UDP_11) {
case (byte) SICSLOWPAN_NHC_UDP_00:
/* 1 byte for NHC, 4 byte for ports, 2 bytes chksum */
srcPort = packet.getInt(hc06_ptr + 1, 2);
destPort = packet.getInt(hc06_ptr + 3, 2);
// memcpy(&SICSLOWPAN_UDP_BUF->udpchksum, hc06_ptr + 5, 2);
// PRINTF("IPHC: Uncompressed UDP ports (7): %x, %x\n",
// SICSLOWPAN_UDP_BUF->srcport, SICSLOWPAN_UDP_BUF->destport);
srcPort = packet.getInt(hc06_ptr + 1, 2) & 0xFFFF;
destPort = packet.getInt(hc06_ptr + 3, 2) & 0xFFFF;
hc06_ptr += 7;
break;
default:
// PRINTF("sicslowpan uncompress_hdr: error unsupported UDP compression\n");
return ANALYSIS_FAILED;
case (byte) SICSLOWPAN_NHC_UDP_01:
/* 1 byte for NHC, 3 byte for ports, 2 bytes chksum */
srcPort = packet.getInt(hc06_ptr + 1, 2);
destPort = SICSLOWPAN_UDP_8_BIT_PORT_MIN + (packet.get(hc06_ptr + 3) & 0xFF);
hc06_ptr += 6;
break;
case (byte) SICSLOWPAN_NHC_UDP_10:
/* 1 byte for NHC, 3 byte for ports, 2 bytes chksum */
srcPort = SICSLOWPAN_UDP_8_BIT_PORT_MIN + (packet.get(hc06_ptr + 1) & 0xFF);
destPort = packet.getInt(hc06_ptr + 2, 2);
hc06_ptr += 6;
break;
case (byte) SICSLOWPAN_NHC_UDP_11:
/* 1 byte for NHC, 1 byte for ports, 2 bytes chksum */
srcPort = SICSLOWPAN_UDP_4_BIT_PORT_MIN + (packet.get(hc06_ptr + 1) >> 4);
destPort = SICSLOWPAN_UDP_4_BIT_PORT_MIN + (packet.get(hc06_ptr + 1) & 0x0F);
hc06_ptr += 4;
break;
}
}
}