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use std::{
net::Ipv4Addr,
sync::{Arc, Mutex, MutexGuard},
};
use crate::{
checksum,
error::NetError,
general::{get_interface, virtual_address_action},
network,
packet::{ARPframe, ArpPacket, EthernetFrame, VrrpPacket},
router::VirtualRouter,
state_machine::{Event, States},
NetResult,
};
/// Listens for when any Event occurs in the Virtual Router.
/// Events that can occur are: Startup, Shutdown, MasterDown, Null
/// Actions happening on when each of these Events is fired are
/// Specified in RFC 3768 section 6.3, 6.4 and 6.5
#[derive(Debug, Clone)]
pub(crate) struct EventObserver;
impl EventObserver {
pub(crate) fn notify(vrouter: Arc<Mutex<VirtualRouter>>, event: Event) -> NetResult<()> {
let vrouter = match vrouter.lock() {
Ok(vrouter) => vrouter,
Err(_) => return Err(NetError("Unable to fetch vrouter mutex".to_string())),
};
EventObserver::notify_mut(vrouter, event)?;
Ok(())
}
pub(crate) fn notify_mut(
mut vrouter: MutexGuard<'_, VirtualRouter>,
event: Event,
) -> NetResult<()> {
let interface = get_interface(&vrouter.network_interface)?;
match event {
Event::Startup => {
if vrouter.fsm.state == States::Init {
if vrouter.priority == 255 {
// send VRRP advertisement.
let mut addresses: Vec<Ipv4Addr> = vec![];
vrouter.ip_addresses.iter().for_each(|ip| {
addresses.push(ip.addr());
});
let mut pkt = VrrpPacket {
version: 2,
hdr_type: 1,
vrid: vrouter.vrid,
priority: vrouter.priority,
count_ip: vrouter.ip_addresses.len() as u8,
auth_type: 0,
adver_int: vrouter.advert_interval,
checksum: 0,
ip_addresses: addresses,
auth_data: 0,
auth_data2: 0,
};
pkt.checksum = checksum::one_complement_sum(&pkt.encode(), Some(6));
let _ = network::send_vrrp_packet(&vrouter.network_interface, pkt);
for ip in &vrouter.ip_addresses {
let eth_frame = EthernetFrame {
dst_mac: [0xff; 6],
src_mac: interface.mac.unwrap().octets(),
ethertype: 0x0806,
};
let arp_pkt = ArpPacket {
hw_type: 1,
proto_type: 0x0800,
hw_length: 6,
proto_length: 4,
operation: 1,
sender_hw_address: interface.mac.unwrap().octets(),
sender_proto_address: ip.addr().octets(),
target_hw_address: [0xff; 6],
target_proto_address: ip.addr().octets(),
};
let arp_frame = ARPframe::new(eth_frame, arp_pkt);
network::send_packet_arp(&interface.name, arp_frame);
}
// bring virtual IP back up.
virtual_address_action(
"add",
&vrouter.str_ipv4_addresses(),
&vrouter.network_interface,
);
let advert_time = vrouter.advert_interval as f32;
vrouter.fsm.set_advert_timer(advert_time);
vrouter.fsm.state = States::Master;
log::info!("({}) transitioned to MASTER (init)", vrouter.name);
} else {
// delete virtual IP.
virtual_address_action(
"delete",
&vrouter.str_ipv4_addresses(),
&vrouter.network_interface,
);
let m_down_interval = vrouter.master_down_interval;
vrouter.fsm.set_master_down_timer(m_down_interval);
vrouter.fsm.state = States::Backup;
log::info!("({}) transitioned to BACKUP (init)", vrouter.name);
}
}
}
Event::Shutdown => {
match vrouter.fsm.state {
States::Backup => {
vrouter.fsm.disable_timer();
vrouter.fsm.state = States::Init;
}
States::Master => {
vrouter.fsm.disable_timer();
// send ADVERTIEMENT
/*
// VRRP pakcet
let mut vrrp_buff: Vec<u8> = vec![0; 16 + (4 * vrouter.ip_addresses.len())];
let mut vrrp_packet = generator.gen_vrrp_header(&mut vrrp_buff, &vrouter);
vrrp_packet.set_checksum(checksum::one_complement_sum(
vrrp_packet.packet(),
Some(6),
));
// IP packet
let ip_len = vrrp_packet.packet().len() + 20;
let mut ip_buff: Vec<u8> = vec![0; ip_len];
let mut ip_packet = generator.gen_vrrp_ip_header(&mut ip_buff);
ip_packet.set_payload(vrrp_packet.packet());
// Ethernet packet
let mut eth_buffer: Vec<u8> = vec![0; 14 + ip_packet.packet().len()];
let mut ether_packet = generator.gen_vrrp_eth_packet(&mut eth_buffer);
ether_packet.set_payload(ip_packet.packet());
sender.send_to(ether_packet.packet(), None);
*/
let mut addresses: Vec<Ipv4Addr> = vec![];
vrouter.ip_addresses.iter().for_each(|ip| {
addresses.push(ip.addr());
});
let mut pkt = VrrpPacket {
version: 2,
hdr_type: 1,
vrid: vrouter.vrid,
priority: vrouter.priority,
count_ip: vrouter.ip_addresses.len() as u8,
auth_type: 0,
adver_int: vrouter.advert_interval,
checksum: 0,
ip_addresses: addresses,
auth_data: 0,
auth_data2: 0,
};
pkt.checksum = checksum::one_complement_sum(&pkt.encode(), Some(6));
let _ = network::send_vrrp_packet(&vrouter.network_interface, pkt);
vrouter.fsm.state = States::Init;
}
States::Init => {}
}
}
Event::MasterDown => {
if vrouter.fsm.state == States::Backup {
// send ADVERTIEMENT then send gratuitous ARP
// VRRP advertisement
{
let mut ips: Vec<Ipv4Addr> = vec![];
for addr in vrouter.ip_addresses.clone() {
ips.push(addr.addr());
}
let mut pkt = VrrpPacket {
version: 2,
hdr_type: 1,
vrid: vrouter.vrid,
priority: vrouter.priority,
count_ip: vrouter.ip_addresses.len() as u8,
checksum: 0,
auth_type: 0,
adver_int: vrouter.advert_interval,
auth_data: 0,
auth_data2: 0,
ip_addresses: ips,
};
pkt.checksum = checksum::one_complement_sum(&pkt.encode(), Some(6));
let _ = network::send_vrrp_packet(vrouter.network_interface.as_str(), pkt);
}
// gratuitous ARP
{
for ip in &vrouter.ip_addresses {
let eth_frame = EthernetFrame {
dst_mac: [0xff; 6],
src_mac: interface.mac.unwrap().octets(),
ethertype: 0x0806,
};
let arp_pkt = ArpPacket {
hw_type: 1,
proto_type: 0x0800,
hw_length: 6,
proto_length: 4,
operation: 1,
sender_hw_address: interface.mac.unwrap().octets(),
sender_proto_address: ip.addr().octets(),
target_hw_address: [0xff; 6],
target_proto_address: ip.addr().octets(),
};
let arp_frame = ARPframe::new(eth_frame, arp_pkt);
network::send_packet_arp(&interface.name, arp_frame);
}
}
// add virtual IP address
virtual_address_action(
"add",
&vrouter.str_ipv4_addresses(),
&vrouter.network_interface,
);
let advert_interval = vrouter.advert_interval as f32;
vrouter.fsm.set_advert_timer(advert_interval);
vrouter.fsm.state = States::Master;
log::info!("({}) Transitioned to MASTER", vrouter.name);
}
}
_ => {}
}
Ok(())
}
}