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Fix CYW43439 payload offsets #1095

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Merged
mattnite merged 1 commit into from
Nov 1, 2026
Merged

Fix CYW43439 payload offsets #1095

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41 changes: 40 additions & 1 deletion drivers/src/wireless/cyw43439/ioctl.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -191,7 +191,11 @@ pub const Response = struct {

pub fn data(self: *Self) []const u8 {
const head: usize = self.padding() + switch (self.sdp.channel()) {
.control => @sizeOf(CDC_Header),
.control => blk: {
// Ensure the cached header parser advances the reader to the payload.
_ = self.cdc();
break :blk @sizeOf(CDC_Header);
},
.event, .data => @sizeOf(BDC_Header) + self.bdc().padding(),
};
const tail = self.sdp.len - @sizeOf(SDP_Header);
Expand Down Expand Up @@ -818,3 +822,38 @@ test "events mask" {
});
try testing.expectEqualSlices(u8, &buf, &mask);
}

test "response payload offset: padded WiFi event is decoded" {
const head = 22; // 14-byte SDPCM header, 4-byte BDC header, 4-byte padding
var packet: [head + @sizeOf(EventPacket)]u8 = @splat(0);
std.mem.writeInt(u16, packet[0..2], packet.len, .little);
std.mem.writeInt(u16, packet[2..4], ~@as(u16, packet.len), .little);
packet[5] = 1; // event channel
packet[7] = 14;
packet[14] = 0x20;
packet[17] = 1; // BDC padding in words
@memcpy(packet[18..22], &[_]u8{ 0, 1, 0xe7, 0 });
std.mem.writeInt(u16, packet[head + 12 ..][0..2], 0x886c, .big);
@memcpy(packet[head + 19 ..][0..3], &[_]u8{ 0, 0x10, 0x18 });
std.mem.writeInt(u32, packet[head + 28 ..][0..4], @backingInt(EventType.auth), .big);
var rsp = try Response.init(&packet);
const evt = rsp.event();
try testing.expect(evt != null);
try testing.expectEqual(EventType.auth, evt.?.msg.event_type);
try testing.expectEqualSlices(u8, packet[head..], rsp.data());
try testing.expectEqualSlices(u8, packet[head..], rsp.data());
}

test "response payload offset: control payload does not depend on reading cdc first" {
const head = @sizeOf(SDP_Header) + @sizeOf(CDC_Header);
var packet: [head + 4]u8 = @splat(0);
std.mem.writeInt(u16, packet[0..2], packet.len, .little);
std.mem.writeInt(u16, packet[2..4], ~@as(u16, packet.len), .little);
packet[7] = @sizeOf(SDP_Header);
std.mem.writeInt(u32, packet[@sizeOf(SDP_Header)..][0..4], @backingInt(Cmd.get_var), .little);
@memcpy(packet[head..], "test");
var rsp = try Response.init(&packet);
try testing.expectEqualSlices(u8, "test", rsp.data());
_ = rsp.cdc();
try testing.expectEqualSlices(u8, "test", rsp.data());
}
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