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use net::stream::{decode_bytes_be, decode_u16, decode_u32, decode_u8};
use net::stream::{encode_bytes, encode_bytes_be, encode_u16, encode_u32, encode_u8};
use net::stream::SResult;
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum MacAddress {
Short(u16),
Long([u8; 8]),
}
impl MacAddress {
pub fn encode(&self, buf: &mut [u8]) -> SResult {
match *self {
MacAddress::Short(ref short_addr) => encode_u16(buf, short_addr.to_be()),
MacAddress::Long(ref long_addr) => encode_bytes_be(buf, long_addr),
}
}
pub fn decode(buf: &[u8], mode: AddressMode) -> SResult<Option<MacAddress>> {
match mode {
AddressMode::NotPresent => stream_done!(0, None),
AddressMode::Short => {
let (off, short_addr_be) = dec_try!(buf; decode_u16);
let short_addr = u16::from_be(short_addr_be);
stream_done!(off, Some(MacAddress::Short(short_addr)));
}
AddressMode::Long => {
let mut long_addr = [0u8; 8];
let off = dec_consume!(buf; decode_bytes_be, &mut long_addr);
stream_done!(off, Some(MacAddress::Long(long_addr)));
}
}
}
}
pub type PanID = u16;
mod frame_control {
pub const FRAME_TYPE_MASK: u16 = 0b111;
pub const SECURITY_ENABLED: u16 = 1 << 3;
pub const FRAME_PENDING: u16 = 1 << 4;
pub const ACK_REQUESTED: u16 = 1 << 5;
pub const PAN_ID_COMPRESSION: u16 = 1 << 6;
pub const SEQ_SUPPRESSED: u16 = 1 << 8;
pub const IE_PRESENT: u16 = 1 << 9;
pub const DST_MODE_POS: usize = 10;
pub const FRAME_VERSION_MASK: u16 = 0b11 << 12;
pub const SRC_MODE_POS: usize = 14;
pub const MODE_MASK: u16 = 0b11;
}
#[repr(u16)]
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum FrameType {
Beacon = 0b000,
Data = 0b001,
Acknowledgement = 0b010,
MACCommand = 0b011,
Multipurpose = 0b101,
Fragment = 0b110,
Extended = 0b111,
}
impl FrameType {
pub fn from_fcf(fcf: u16) -> Option<FrameType> {
match fcf & frame_control::FRAME_TYPE_MASK {
0b000 => Some(FrameType::Beacon),
0b001 => Some(FrameType::Data),
0b010 => Some(FrameType::Acknowledgement),
0b011 => Some(FrameType::MACCommand),
0b101 => Some(FrameType::Multipurpose),
0b110 => Some(FrameType::Fragment),
0b111 => Some(FrameType::Extended),
_ => None,
}
}
}
#[repr(u16)]
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum FrameVersion {
V2003 = 0x0000,
V2006 = 0x1000,
V2015 = 0x2000,
}
impl FrameVersion {
pub fn from_fcf(fcf: u16) -> Option<FrameVersion> {
match fcf & frame_control::FRAME_VERSION_MASK {
0x0000 => Some(FrameVersion::V2003),
0x1000 => Some(FrameVersion::V2006),
0x2000 => Some(FrameVersion::V2015),
_ => None,
}
}
}
#[repr(u8)]
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum AddressMode {
NotPresent = 0b00,
Short = 0b10,
Long = 0b11,
}
impl<'a> From<&'a Option<MacAddress>> for AddressMode {
fn from(opt_addr: &'a Option<MacAddress>) -> Self {
match *opt_addr {
None => AddressMode::NotPresent,
Some(addr) => match addr {
MacAddress::Short(_) => AddressMode::Short,
MacAddress::Long(_) => AddressMode::Long,
},
}
}
}
impl AddressMode {
pub fn from_mode(mode: u16) -> Option<AddressMode> {
match mode {
0b00 => Some(AddressMode::NotPresent),
0b10 => Some(AddressMode::Short),
0b11 => Some(AddressMode::Long),
_ => None,
}
}
}
mod security_control {
pub const SECURITY_LEVEL_MASK: u8 = 0b111;
pub const KEY_ID_MODE_MASK: u8 = 0b11 << 3;
pub const FRAME_COUNTER_SUPPRESSION: u8 = 1 << 5;
pub const ASN_IN_NONCE: u8 = 1 << 6;
}
#[repr(u8)]
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum SecurityLevel {
None = 0b000,
Mic32 = 0b001,
Mic64 = 0b010,
Mic128 = 0b011,
EncMic32 = 0b101,
EncMic64 = 0b110,
EncMic128 = 0b111,
}
impl SecurityLevel {
pub fn from_scf(scf: u8) -> Option<SecurityLevel> {
match scf & security_control::SECURITY_LEVEL_MASK {
0b000 => Some(SecurityLevel::None),
0b001 => Some(SecurityLevel::Mic32),
0b010 => Some(SecurityLevel::Mic64),
0b011 => Some(SecurityLevel::Mic128),
0b101 => Some(SecurityLevel::EncMic32),
0b110 => Some(SecurityLevel::EncMic64),
0b111 => Some(SecurityLevel::EncMic128),
_ => None,
}
}
pub fn encryption_needed(&self) -> bool {
match *self {
SecurityLevel::EncMic32 | SecurityLevel::EncMic64 | SecurityLevel::EncMic128 => true,
_ => false,
}
}
pub fn mic_len(&self) -> usize {
match *self {
SecurityLevel::Mic32 | SecurityLevel::EncMic32 => 4,
SecurityLevel::Mic64 | SecurityLevel::EncMic64 => 8,
SecurityLevel::Mic128 | SecurityLevel::EncMic128 => 16,
_ => 0,
}
}
}
#[repr(u8)]
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum KeyIdMode {
Implicit = 0x00,
Index = 0x08,
Source4Index = 0x10,
Source8Index = 0x18,
}
impl KeyIdMode {
pub fn from_scf(scf: u8) -> Option<KeyIdMode> {
match scf & security_control::KEY_ID_MODE_MASK {
0x00 => Some(KeyIdMode::Implicit),
0x08 => Some(KeyIdMode::Index),
0x10 => Some(KeyIdMode::Source4Index),
0x18 => Some(KeyIdMode::Source8Index),
_ => panic!("Unreachable case because of mask"),
}
}
}
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum KeyId {
Implicit,
Index(u8),
Source4Index([u8; 4], u8),
Source8Index([u8; 8], u8),
}
impl KeyId {
pub fn encode(&self, buf: &mut [u8]) -> SResult {
let off = match *self {
KeyId::Implicit => 0,
KeyId::Index(index) => enc_consume!(buf; encode_u8, index),
KeyId::Source4Index(ref src, index) => {
let off = enc_consume!(buf; encode_bytes_be, src);
enc_consume!(buf, off; encode_u8, index)
}
KeyId::Source8Index(ref src, index) => {
let off = enc_consume!(buf; encode_bytes_be, src);
enc_consume!(buf, off; encode_u8, index)
}
};
stream_done!(off);
}
pub fn decode(buf: &[u8], mode: KeyIdMode) -> SResult<KeyId> {
match mode {
KeyIdMode::Implicit => stream_done!(0, KeyId::Implicit),
KeyIdMode::Index => {
let (off, index) = dec_try!(buf; decode_u8);
stream_done!(off, KeyId::Index(index));
}
KeyIdMode::Source4Index => {
let mut src = [0u8; 4];
let off = dec_consume!(buf; decode_bytes_be, &mut src);
let (off, index) = dec_try!(buf, off; decode_u8);
stream_done!(off, KeyId::Source4Index(src, index));
}
KeyIdMode::Source8Index => {
let mut src = [0u8; 8];
let off = dec_consume!(buf; decode_bytes_be, &mut src);
let (off, index) = dec_try!(buf, off; decode_u8);
stream_done!(off, KeyId::Source8Index(src, index));
}
}
}
}
impl<'a> From<&'a KeyId> for KeyIdMode {
fn from(key_id: &'a KeyId) -> Self {
match *key_id {
KeyId::Implicit => KeyIdMode::Implicit,
KeyId::Index(_) => KeyIdMode::Index,
KeyId::Source4Index(_, _) => KeyIdMode::Source4Index,
KeyId::Source8Index(_, _) => KeyIdMode::Source8Index,
}
}
}
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub struct Security {
pub level: SecurityLevel,
pub asn_in_nonce: bool,
pub frame_counter: Option<u32>,
pub key_id: KeyId,
}
impl Security {
pub fn encode(&self, buf: &mut [u8]) -> SResult {
stream_len_cond!(buf, 1);
let mut off = 1;
let mut scf = self.level as u8;
if self.asn_in_nonce {
scf |= security_control::ASN_IN_NONCE;
}
if let Some(ref frame_counter) = self.frame_counter {
off = enc_consume!(buf, off; encode_u32, frame_counter.to_be());
} else {
scf |= security_control::FRAME_COUNTER_SUPPRESSION;
}
scf |= KeyIdMode::from(&self.key_id) as u8;
off = enc_consume!(buf, off; self.key_id; encode);
enc_try!(buf; encode_u8, scf);
stream_done!(off);
}
pub fn decode(buf: &[u8]) -> SResult<Security> {
let (off, scf) = dec_try!(buf; decode_u8);
let level = stream_from_option!(SecurityLevel::from_scf(scf));
let asn_in_nonce = (scf & security_control::ASN_IN_NONCE) != 0;
let frame_counter_present = (scf & security_control::FRAME_COUNTER_SUPPRESSION) != 0;
let (off, frame_counter) = if frame_counter_present {
let (off, frame_counter_be) = dec_try!(buf, off; decode_u32);
(off, Some(u32::from_be(frame_counter_be)))
} else {
(off, None)
};
let key_id_mode = stream_from_option!(KeyIdMode::from_scf(scf));
let (off, key_id) = dec_try!(buf, off; KeyId::decode, key_id_mode);
stream_done!(
off,
Security {
level: level,
asn_in_nonce: asn_in_nonce,
frame_counter: frame_counter,
key_id: key_id,
}
);
}
}
mod ie_control {
pub const HEADER_LEN_MAX: usize = (1 << 7) - 1;
pub const HEADER_LEN_MASK: u16 = HEADER_LEN_MAX as u16;
pub const HEADER_ID_POS: usize = 7;
pub const PAYLOAD_LEN_MAX: usize = (1 << 11) - 1;
pub const PAYLOAD_LEN_MASK: u16 = PAYLOAD_LEN_MAX as u16;
pub const PAYLOAD_ID_MASK: u8 = 0xf;
pub const PAYLOAD_ID_POS: usize = 11;
pub const TYPE: u16 = 0x8000;
}
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum HeaderIE<'a> {
Undissected { element_id: u8, content: &'a [u8] },
Termination1,
Termination2,
}
impl<'a> Default for HeaderIE<'a> {
fn default() -> Self {
HeaderIE::Termination1
}
}
impl<'a> HeaderIE<'a> {
pub fn is_termination(&self) -> bool {
match *self {
HeaderIE::Termination1 | HeaderIE::Termination2 => true,
_ => false,
}
}
pub fn encode(&self, buf: &mut [u8]) -> SResult {
use self::HeaderIE::*;
let mut off = 2;
let element_id: u8 = match *self {
Undissected {
element_id,
content,
} => {
off = enc_consume!(buf, off; encode_bytes, content);
element_id
}
Termination1 => 0x7e,
Termination2 => 0x7f,
};
let content_len = off - 2;
stream_cond!(content_len <= ie_control::HEADER_LEN_MAX);
let ie_ctl = ((content_len as u16) & ie_control::HEADER_LEN_MASK)
| ((element_id as u16) << ie_control::HEADER_ID_POS);
enc_consume!(buf; encode_u16, ie_ctl.to_be());
stream_done!(off);
}
pub fn decode<'b>(buf: &'b [u8]) -> SResult<HeaderIE<'b>> {
let (off, ie_ctl_be) = dec_try!(buf; decode_u16);
let ie_ctl = u16::from_be(ie_ctl_be);
stream_cond!(ie_ctl & ie_control::TYPE == 0);
let content_len = (ie_ctl & ie_control::HEADER_LEN_MASK) as usize;
let element_id = (ie_ctl >> ie_control::HEADER_ID_POS) as u8;
stream_len_cond!(buf, off + content_len);
let content = &buf[off..off + content_len];
use self::HeaderIE::*;
let ie = match element_id {
0x7e => Termination1,
0x7f => Termination2,
element_id => Undissected {
element_id: element_id,
content: content,
},
};
stream_done!(off + content_len, ie);
}
}
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum PayloadIE<'a> {
Undissected { group_id: u8, content: &'a [u8] },
Termination,
}
impl<'a> Default for PayloadIE<'a> {
fn default() -> Self {
PayloadIE::Termination
}
}
impl<'a> PayloadIE<'a> {
pub fn is_termination(&self) -> bool {
match *self {
PayloadIE::Termination => true,
_ => false,
}
}
pub fn encode(&self, buf: &mut [u8]) -> SResult {
use self::PayloadIE::*;
let mut off = 2;
let group_id: u8 = match *self {
Undissected { group_id, content } => {
off = enc_consume!(buf, off; encode_bytes, content);
group_id
}
Termination => 0xf,
};
let content_len = off - 2;
stream_cond!(content_len <= ie_control::PAYLOAD_LEN_MAX);
let ie_ctl = ((content_len as u16) & ie_control::PAYLOAD_LEN_MASK)
| ((group_id & ie_control::PAYLOAD_ID_MASK) as u16) << ie_control::PAYLOAD_ID_POS;
enc_consume!(buf; encode_u16, ie_ctl.to_be());
stream_done!(off);
}
pub fn decode<'b>(buf: &'b [u8]) -> SResult<PayloadIE<'b>> {
let (off, ie_ctl_be) = dec_try!(buf; decode_u16);
let ie_ctl = u16::from_be(ie_ctl_be);
stream_cond!(ie_ctl & ie_control::TYPE != 0);
let content_len = (ie_ctl & ie_control::PAYLOAD_LEN_MASK) as usize;
let element_id =
((ie_ctl >> ie_control::PAYLOAD_ID_POS) as u8) & ie_control::PAYLOAD_ID_MASK;
stream_len_cond!(buf, off + content_len);
let content = &buf[off..off + content_len];
use self::PayloadIE::*;
let ie = match element_id {
0xf => Termination,
group_id => Undissected {
group_id: group_id,
content: content,
},
};
stream_done!(off + content_len, ie);
}
}
pub const MAX_HEADER_IES: usize = 5;
pub const MAX_PAYLOAD_IES: usize = 5;
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub struct Header<'a> {
pub frame_type: FrameType,
pub frame_pending: bool,
pub ack_requested: bool,
pub version: FrameVersion,
pub seq: Option<u8>,
pub dst_pan: Option<PanID>,
pub dst_addr: Option<MacAddress>,
pub src_pan: Option<PanID>,
pub src_addr: Option<MacAddress>,
pub security: Option<Security>,
pub header_ies: [HeaderIE<'a>; MAX_HEADER_IES],
pub header_ies_len: usize,
pub payload_ies: [PayloadIE<'a>; MAX_PAYLOAD_IES],
pub payload_ies_len: usize,
}
impl<'a> Header<'a> {
pub fn encode(&self, buf: &mut [u8], has_payload: bool) -> SResult<usize> {
stream_len_cond!(buf, 2);
let mut off = 2;
if self.version != FrameVersion::V2015 {
stream_cond!(self.seq.is_some());
}
let seq_suppressed = if let Some(seq) = self.seq {
off = enc_consume!(buf, off; encode_u8, seq);
false
} else {
true
};
let (off, pan_id_compression) = enc_try!(buf, off; self; encode_addressing);
let dst_mode = AddressMode::from(&self.dst_addr);
let src_mode = AddressMode::from(&self.src_addr);
let (mut off, security_enabled) = match self.security {
None => (off, false),
Some(ref security) => (enc_consume!(buf, off; security; encode), true),
};
let has_header_ies = self.header_ies_len != 0;
let has_payload_ies = self.payload_ies_len != 0;
stream_cond!(self.header_ies_len <= MAX_HEADER_IES);
stream_cond!(self.payload_ies_len <= MAX_PAYLOAD_IES);
for ie in self.header_ies[..self.header_ies_len].iter() {
stream_cond!(!ie.is_termination());
off = enc_consume!(buf, off; ie; encode);
}
if has_payload_ies {
off = enc_consume!(buf, off; HeaderIE::Termination1; encode);
} else if has_header_ies && has_payload {
off = enc_consume!(buf, off; HeaderIE::Termination2; encode);
}
let mac_payload_off = off;
for ie in self.payload_ies[..self.payload_ies_len].iter() {
stream_cond!(!ie.is_termination());
off = enc_consume!(buf, off; ie; encode);
}
if has_payload_ies && has_payload {
off = enc_consume!(buf, off; PayloadIE::Termination; encode);
}
let ie_present = has_header_ies || has_payload_ies;
let mut fcf = self.frame_type as u16;
if security_enabled {
fcf |= frame_control::SECURITY_ENABLED;
}
if self.frame_pending {
fcf |= frame_control::FRAME_PENDING;
}
if self.ack_requested {
fcf |= frame_control::ACK_REQUESTED;
}
if pan_id_compression {
fcf |= frame_control::PAN_ID_COMPRESSION;
}
if seq_suppressed {
fcf |= frame_control::SEQ_SUPPRESSED;
}
if ie_present {
fcf |= frame_control::IE_PRESENT;
}
fcf |= (dst_mode as u16) << frame_control::DST_MODE_POS;
fcf |= self.version as u16;
fcf |= (src_mode as u16) << frame_control::SRC_MODE_POS;
enc_try!(buf; encode_u16, fcf.to_be());
stream_done!(off, mac_payload_off);
}
pub fn encode_addressing(&self, buf: &mut [u8]) -> SResult<bool> {
let mut drop_src_pan = false;
let pan_id_compression = match self.version {
FrameVersion::V2015 => {
match (self.dst_addr, self.src_addr) {
(None, None) => {
stream_cond!(self.src_pan.is_none());
self.dst_pan.is_some()
}
(Some(_), None) => {
stream_cond!(self.src_pan.is_none());
self.dst_pan.is_none()
}
(None, Some(_)) => {
stream_cond!(self.dst_pan.is_none());
self.src_pan.is_none()
}
(Some(_), Some(_)) => {
drop_src_pan = match (self.dst_pan, self.src_pan) {
(Some(dst_pan), Some(src_pan)) => dst_pan == src_pan,
_ => stream_err!(),
};
drop_src_pan
}
}
}
FrameVersion::V2003 | FrameVersion::V2006 => {
stream_cond!(self.dst_addr.is_some() == self.dst_pan.is_some());
stream_cond!(self.src_addr.is_some() == self.src_pan.is_some());
match (self.dst_pan, self.src_pan) {
(Some(dst_pan), Some(src_pan)) => {
drop_src_pan = dst_pan == src_pan;
}
_ => {}
}
drop_src_pan
}
};
let mut off = 0;
if let Some(pan) = self.dst_pan {
off = enc_consume!(buf, off; encode_u16, pan.to_be());
}
if let Some(addr) = self.dst_addr {
off = enc_consume!(buf, off; addr; encode);
}
if let Some(pan) = self.src_pan {
if !drop_src_pan {
off = enc_consume!(buf, off; encode_u16, pan.to_be());
}
}
if let Some(addr) = self.src_addr {
off = enc_consume!(buf, off; addr; encode);
}
stream_done!(off, pan_id_compression);
}
pub fn decode<'b>(buf: &'b [u8], unsecured: bool) -> SResult<(Header<'b>, usize)> {
let (off, fcf_be) = dec_try!(buf; decode_u16);
let fcf = u16::from_be(fcf_be);
let frame_type = stream_from_option!(FrameType::from_fcf(fcf));
let security_enabled = (fcf & frame_control::SECURITY_ENABLED) != 0;
let frame_pending = (fcf & frame_control::FRAME_PENDING) != 0;
let ack_requested = (fcf & frame_control::ACK_REQUESTED) != 0;
let pan_id_compression = (fcf & frame_control::PAN_ID_COMPRESSION) != 0;
let seq_suppressed = (fcf & frame_control::SEQ_SUPPRESSED) != 0;
let ie_present = (fcf & frame_control::IE_PRESENT) != 0;
let dst_mode = {
let mode = (fcf >> frame_control::DST_MODE_POS) & frame_control::MODE_MASK;
stream_from_option!(AddressMode::from_mode(mode))
};
let version = stream_from_option!(FrameVersion::from_fcf(fcf));
let src_mode = {
let mode = (fcf >> frame_control::SRC_MODE_POS) & frame_control::MODE_MASK;
stream_from_option!(AddressMode::from_mode(mode))
};
let (off, seq) = if !seq_suppressed {
let (off, seq) = dec_try!(buf, off; decode_u8);
(off, Some(seq))
} else {
(off, None)
};
let (off, (dst_pan, dst_addr, src_pan, src_addr)) = dec_try!(buf, off;
Self::decode_addressing,
version,
dst_mode,
src_mode,
pan_id_compression);
let (mut off, security) = if security_enabled {
let (off, security) = dec_try!(buf, off; Security::decode);
(off, Some(security))
} else {
(off, None)
};
let mut header_ies: [HeaderIE<'b>; MAX_HEADER_IES] = Default::default();
let mut header_ies_len = 0;
let mut payload_ies: [PayloadIE<'b>; MAX_PAYLOAD_IES] = Default::default();
let mut payload_ies_len = 0;
let mut has_payload_ies = false;
if ie_present {
loop {
let (next_off, ie) = dec_try!(buf, off; HeaderIE::decode);
off = next_off;
match ie {
HeaderIE::Termination1 => {
has_payload_ies = true;
break;
}
HeaderIE::Termination2 => {
break;
}
other_ie => {
stream_cond!(header_ies_len + 1 < MAX_HEADER_IES);
header_ies[header_ies_len] = other_ie;
header_ies_len += 1;
}
}
}
}
let mac_payload_off = off;
let unencrypted = unsecured || !security_enabled;
if has_payload_ies && unencrypted {
loop {
let (next_off, ie) = dec_try!(buf, off; PayloadIE::decode);
off = next_off;
match ie {
PayloadIE::Termination => {
break;
}
other_ie => {
stream_cond!(payload_ies_len + 1 < MAX_PAYLOAD_IES);
payload_ies[payload_ies_len] = other_ie;
payload_ies_len += 1;
}
}
}
}
stream_done!(
off,
(
Header {
frame_type: frame_type,
frame_pending: frame_pending,
ack_requested: ack_requested,
version: version,
seq: seq,
dst_pan: dst_pan,
dst_addr: dst_addr,
src_pan: src_pan,
src_addr: src_addr,
security: security,
header_ies: header_ies,
header_ies_len: header_ies_len,
payload_ies: payload_ies,
payload_ies_len: payload_ies_len,
},
mac_payload_off
)
);
}
pub fn decode_addressing(
buf: &[u8],
version: FrameVersion,
dst_mode: AddressMode,
src_mode: AddressMode,
pan_id_compression: bool,
) -> SResult<
(
Option<PanID>,
Option<MacAddress>,
Option<PanID>,
Option<MacAddress>,
),
> {
let mut src_pan_dropped = false;
let dst_present = dst_mode != AddressMode::NotPresent;
let src_present = src_mode != AddressMode::NotPresent;
let (dst_pan_present, src_pan_present) = match version {
FrameVersion::V2015 => {
match (dst_present, src_present) {
(false, false) => (pan_id_compression, false),
(true, false) => (!pan_id_compression, false),
(false, true) => (false, !pan_id_compression),
(true, true) => {
src_pan_dropped = pan_id_compression;
(true, !pan_id_compression)
}
}
}
FrameVersion::V2003 | FrameVersion::V2006 => {
src_pan_dropped = pan_id_compression;
(dst_present, src_present && !src_pan_dropped)
}
};
let off = 0;
let (off, dst_pan) = if dst_pan_present {
let (off, pan_be) = dec_try!(buf, off; decode_u16);
(off, Some(u16::from_be(pan_be)))
} else {
(off, None)
};
let (off, dst_addr) = dec_try!(buf, off; MacAddress::decode, dst_mode);
let (off, src_pan) = if src_pan_present {
let (off, pan_be) = dec_try!(buf, off; decode_u16);
(off, Some(u16::from_be(pan_be)))
} else {
if src_pan_dropped {
(off, Some(stream_from_option!(dst_pan)))
} else {
(off, None)
}
};
let (off, src_addr) = dec_try!(buf, off; MacAddress::decode, src_mode);
stream_done!(off, (dst_pan, dst_addr, src_pan, src_addr));
}
}