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use net::stream::{decode_bytes, decode_u16, decode_u8};
use net::stream::{encode_bytes, encode_u16, encode_u8};
use net::stream::SResult;
#[derive(Copy, Clone, PartialEq)]
pub enum MacAddr {
ShortAddr(u16),
LongAddr([u8; 8]),
}
pub mod ip6_nh {
pub const HOP_OPTS: u8 = 0;
pub const TCP: u8 = 6;
pub const UDP: u8 = 17;
pub const IP6: u8 = 41;
pub const ROUTING: u8 = 43;
pub const FRAGMENT: u8 = 44;
pub const ICMP: u8 = 58;
pub const NO_NEXT: u8 = 59;
pub const DST_OPTS: u8 = 60;
pub const MOBILITY: u8 = 135;
}
#[derive(Copy, Clone, Debug)]
pub struct IPAddr(pub [u8; 16]);
impl IPAddr {
pub fn new() -> IPAddr {
IPAddr([0; 16])
}
pub fn is_unspecified(&self) -> bool {
self.0.iter().all(|&b| b == 0)
}
pub fn is_unicast_link_local(&self) -> bool {
self.0[0] == 0xfe && (self.0[1] & 0xc0) == 0x80 && (self.0[1] & 0x3f) == 0
&& self.0[2..8].iter().all(|&b| b == 0)
}
pub fn set_unicast_link_local(&mut self) {
self.0[0] = 0xfe;
self.0[1] = 0x80;
for i in 2..8 {
self.0[i] = 0;
}
}
pub fn set_prefix(&mut self, prefix: &[u8], prefix_len: u8) {
let full_bytes = (prefix_len / 8) as usize;
let remaining = (prefix_len & 0x7) as usize;
let bytes = full_bytes + (if remaining != 0 { 1 } else { 0 });
assert!(bytes <= prefix.len() && bytes <= 16);
self.0[0..full_bytes].copy_from_slice(&prefix[0..full_bytes]);
if remaining != 0 {
let mask = (0xff as u8) << (8 - remaining);
self.0[full_bytes] &= !mask;
self.0[full_bytes] |= mask & prefix[full_bytes];
}
}
pub fn is_multicast(&self) -> bool {
self.0[0] == 0xff
}
}
#[repr(C)]
#[derive(Copy, Clone)]
pub struct IP6Header {
pub version_class_flow: [u8; 4],
pub payload_len: u16,
pub next_header: u8,
pub hop_limit: u8,
pub src_addr: IPAddr,
pub dst_addr: IPAddr,
}
impl Default for IP6Header {
fn default() -> IP6Header {
let version = 0x60;
let hop_limit = 255;
IP6Header {
version_class_flow: [version, 0, 0, 0],
payload_len: 0,
next_header: ip6_nh::NO_NEXT,
hop_limit: hop_limit,
src_addr: IPAddr::new(),
dst_addr: IPAddr::new(),
}
}
}
impl IP6Header {
pub fn new() -> IP6Header {
IP6Header::default()
}
pub fn decode(buf: &[u8]) -> SResult<IP6Header> {
stream_len_cond!(buf, 40);
let mut ip6_header = Self::new();
let off = dec_consume!(buf, 0; decode_bytes, &mut ip6_header.version_class_flow);
let (off, payload_len_be) = dec_try!(buf, off; decode_u16);
ip6_header.payload_len = u16::from_be(payload_len_be);
let (off, next_header) = dec_try!(buf, off; decode_u8);
ip6_header.next_header = next_header;
let (off, hop_limit) = dec_try!(buf, off; decode_u8);
ip6_header.hop_limit = hop_limit;
let off = dec_consume!(buf, off; decode_bytes, &mut ip6_header.src_addr.0);
let off = dec_consume!(buf, off; decode_bytes, &mut ip6_header.dst_addr.0);
stream_done!(off, ip6_header);
}
pub fn encode(buf: &mut [u8], ip6_header: IP6Header) -> SResult<usize> {
stream_len_cond!(buf, 40);
let mut off = enc_consume!(buf, 0; encode_bytes, &ip6_header.version_class_flow);
off = enc_consume!(buf, off; encode_u16, ip6_header.payload_len.to_be());
off = enc_consume!(buf, off; encode_u8, ip6_header.next_header);
off = enc_consume!(buf, off; encode_u8, ip6_header.hop_limit);
off = enc_consume!(buf, off; encode_bytes, &ip6_header.src_addr.0);
off = enc_consume!(buf, off; encode_bytes, &ip6_header.dst_addr.0);
stream_done!(off, off);
}
pub fn get_version(&self) -> u8 {
(self.version_class_flow[0] & 0xf0) >> 4
}
pub fn get_traffic_class(&self) -> u8 {
(self.version_class_flow[0] & 0x0f) << 4 | (self.version_class_flow[1] & 0xf0) >> 4
}
pub fn set_traffic_class(&mut self, new_tc: u8) {
self.version_class_flow[0] &= 0xf0;
self.version_class_flow[0] |= (new_tc & 0xf0) >> 4;
self.version_class_flow[1] &= 0x0f;
self.version_class_flow[1] |= (new_tc & 0x0f) << 4;
}
fn get_dscp_unshifted(&self) -> u8 {
self.get_traffic_class() & 0b11111100
}
pub fn get_dscp(&self) -> u8 {
self.get_dscp_unshifted() >> 2
}
pub fn set_dscp(&mut self, new_dscp: u8) {
let ecn = self.get_ecn();
self.set_traffic_class(ecn | ((new_dscp << 2) & 0b11111100));
}
pub fn get_ecn(&self) -> u8 {
self.get_traffic_class() & 0b11
}
pub fn set_ecn(&mut self, new_ecn: u8) {
let dscp_unshifted = self.get_dscp_unshifted();
self.set_traffic_class(dscp_unshifted | (new_ecn & 0b11));
}
pub fn get_flow_label(&self) -> u32 {
let mut flow_label: u32 = 0;
flow_label |= ((self.version_class_flow[1] & 0x0f) as u32) << 16;
flow_label |= (self.version_class_flow[2] as u32) << 8;
flow_label |= self.version_class_flow[3] as u32;
flow_label
}
pub fn set_flow_label(&mut self, new_fl_val: u32) {
self.version_class_flow[1] &= 0xf0;
self.version_class_flow[1] |= ((new_fl_val >> 16) & 0x0f) as u8;
self.version_class_flow[2] = (new_fl_val >> 8) as u8;
self.version_class_flow[3] = new_fl_val as u8;
}
pub fn get_payload_len(&self) -> u16 {
u16::from_be(self.payload_len)
}
pub fn get_total_len(&self) -> u16 {
40 + self.get_payload_len()
}
pub fn set_payload_len(&mut self, new_len: u16) {
self.payload_len = new_len.to_be();
}
pub fn get_next_header(&self) -> u8 {
self.next_header
}
pub fn set_next_header(&mut self, new_nh: u8) {
self.next_header = new_nh;
}
pub fn get_hop_limit(&self) -> u8 {
self.hop_limit
}
pub fn set_hop_limit(&mut self, new_hl: u8) {
self.hop_limit = new_hl;
}
}