[−][src]Module neli::nlattr
Netlink attribute handler This module aims to provide simple parsing for generic netlink attributes, including parsing for nested attributes.
Due to netlink's loose treatment of types, parsing attributes can be hard to model in
Rust. neli's current solution is the following:
// This was received from the socket let nlmsg = neli::nl::Nlmsghdr::new(None, neli::consts::GenlId::Ctrl, Vec::new(), None, None, neli::genl::Genlmsghdr::new(neli::consts::CtrlCmd::Unspec, 2, Vec::new()).unwrap()); // Get parsing handler for the attributes in this message where the next call // to either get_nested_attributes() or get_payload_with() will expect a u16 type // to be provided let mut handle = nlmsg.nl_payload.get_attr_handle(); // Get the nested attribute where the Nlattr field of nla_type is equal to 1 and return // a handler containing only this nested attribute internally let mut next = handle.get_nested_attributes::<u16>(1).unwrap(); // Get the nested attribute where the Nlattr field of nla_type is equal to 1 and return // the payload of this attribute as a u32 let thirty_two_bit_integer = next.get_attr_payload_as::<u32>(1).unwrap();
Design decisions
Nested attributes are represented by Vec<u8> payloads inside top level attributes. They are
parsed during traversal to provide the ability to parse one attribute header using a different
generic type for the nested attribute type parameters, the typical case when parsing nested
attributes. To
traverse a nested attribute, look at the documentation for .get_nested_attributes() and
AttrHandle as well as the examples/ directory for code examples of how to traverse nested
attributes.
Structs
| Nlattr | Struct representing netlink attributes and payloads |
Enums
| AttrHandle | Handle returned by |