nl_address_task.hxx

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#pragma once
 
#include <cstdint>
#include <span>
 
#include <linux/if_addr.h>
#include <linux/netlink.h>
 
#include "rtaco/tasks/nl_request_task.hxx"
 
namespace llmx {
namespace rtaco {
 
struct AddressRequest {
    nlmsghdr header;
    ifaddrmsg message;
};

template<typename Derived, typename Result>
class AddressTask : public RequestTask<Derived, Result> {
protected:
    AddressRequest request_{};
 
public:
    using RequestTask<Derived, Result>::RequestTask;

    auto request_payload() const -> std::span<const uint8_t> {
        return {reinterpret_cast<const uint8_t*>(&request_), request_.header.nlmsg_len};
    }
 
protected:
    void build_request(uint16_t msg_flags = NLM_F_REQUEST | NLM_F_DUMP,
            uint8_t address_family = RTN_UNSPEC, uint8_t prefixlen = 0,
            uint8_t ifa_flags = 0, uint8_t scope = RT_SCOPE_UNIVERSE) {
        request_.header.nlmsg_len = NLMSG_LENGTH(sizeof(ifaddrmsg));
        request_.header.nlmsg_type = RTM_GETADDR;
        request_.header.nlmsg_flags = msg_flags;
        request_.header.nlmsg_seq = this->sequence();
        request_.header.nlmsg_pid = 0;
 
        request_.message.ifa_family = address_family;
        request_.message.ifa_prefixlen = prefixlen;
        request_.message.ifa_flags = ifa_flags;
        request_.message.ifa_scope = scope;
        request_.message.ifa_index = this->ifindex();
    }
};
 
} // namespace rtaco
} // namespace llmx