Enum Init

pub enum Init {
    EchoRequest {
        source: Source,
        dst_addr: Address,
        ident: u16,
        seq_no: u16,
        payload: usize,
    },
}

A helper struct for packet initialization.

In other layers the equivalent utilizes the endpoint itself for specialized initialization but the ICMP endpoint has almost no state. The [RawPacket::prepare] method thus mostly wraps packet buffer initialization that could be implemented by the user, in a slightly more ergonomic interface.

Variants

EchoRequest

An initializer for an echo request, expecting an echo response by the identified remote party.

Fields

source: Source

The network source address to use.

You likely want to use an address that was configured in the IP layer so that the response will actually be forwarded accordingly.

dst_addr: Address

The network destination address to query.

ident: u16

An arbitrary identifier for the requested.

seq_no: u16

A sequence number for repeated requests.

payload: usize

The length of user defined payload.

The content is likely ignored by the receiver, other than being echoed back.