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in network tab, decode and id "Private MAC" addresses #3661

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in network tab, decode and id "Private MAC" addresses #3661

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59 changes: 50 additions & 9 deletions scripts/js/network.js
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Original file line number Diff line number Diff line change
Expand Up @@ -179,16 +179,57 @@ $(() => {
$("td:eq(0)", row).html(ips.join("<br>"));

// MAC + Vendor field if available
if (data.macVendor && data.macVendor.length > 0) {
$("td:eq(1)", row).html(
utils.escapeHtml(data.hwaddr) + "<br>" + utils.escapeHtml(data.macVendor)
);
}

// Make mock MAC addresses italics and add title
const cell = $("td:eq(1)", row);
if (data.hwaddr.startsWith("ip-")) {
$("td:eq(1)", row).css("font-style", "italic");
$("td:eq(1)", row).attr("title", "Mock MAC address");
// Case 1 - Make mock MAC addresses italics and add title
cell.css("font-style", "italic").attr("title", "Mock MAC address");
} else if (data.hwaddr.includes(":")) {
// Case 2 — MAC-like address
const parts = data.hwaddr.split(":");
const firstOctet = Number.parseInt(parts[0], 16);
// Arithmetic-only flag detection
const isMulticast = firstOctet % 2 === 1; // bit 0
const isLocal = Math.floor(firstOctet / 2) % 2 === 1; // bit 1
// Multicast overrides all SLAP meaning
if (isMulticast) {
// Case 2.1 - Multicast
cell.html(utils.escapeHtml(data.hwaddr) + "<br>Multicast Address");
} else if (isLocal) {
// Case 2.2 - Local SLAP
let slapLabel = null;
// SLAP quadrant resolution (RFC 9542)
const ts = Math.floor(firstOctet / 4) % 4; // bits 2–3 become bits 0–1
switch (ts) {
case 0x0:
slapLabel = "Administratively Assigned (AAI)";
break;
case 0x1:
slapLabel = "Extended Local (ELI)";
break;
case 0x2:
slapLabel = "Reserved";
break;
case 0x3:
slapLabel = "Standard Assigned (SAI)";
break;
default:
// satisfy ESLint
slapLabel = "Unclassified";
break;
}

cell.html(utils.escapeHtml(data.hwaddr) + "<br>Locally Administered");
cell.css("font-style", "italic").attr("title", slapLabel);
} else if (data.macVendor && data.macVendor.length > 0) {
// Case 2.3 - Global address space (U/L = 0)
cell.html(utils.escapeHtml(data.hwaddr) + "<br>" + utils.escapeHtml(data.macVendor));
} else {
// Case 2.4 - Lookup failed
cell.html(utils.escapeHtml(data.hwaddr) + "<br>Global: Unknown");
}
} else {
// Case 3 — Not IP-mock, not MAC-like
cell.css("color", "red").html(utils.escapeHtml(data.hwaddr) + "<br>Unknown Format");
}

// Add delete button
Expand Down