mirror of
https://gitlab.isc.org/isc-projects/dhcp
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191 lines
3.8 KiB
Plaintext
191 lines
3.8 KiB
Plaintext
This document describes the packet flows in DHCPv4, DHCPv6 and
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DHCPv4-over-DHCPv6 for the client and the server.
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DHCPv4 client
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State machine (including startup and timeouts)
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send_<message_type>()
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send_packet() |
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add_timeout() (for retry)
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I/O receive handler got_one()
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receive_packet()
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do_packet() (bootp_packet_handler)
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parse_options() | |
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bootp() |
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| dhcp()
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dhcpoffer() |
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dhcp{offer,nack,ack}()
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manage lease & state machine
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DHCPv6 client
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State machine (including startup and timeouts)
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do_xxx()
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append IA_NA, IA_TA and/or IA_PD
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send_packet6() |
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add_timeout() (for retry)
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I/O receive handler got_one_v6()
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receive_packet6()
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do_packet6() (dhcpv6_packet_handler) (relayed or direct message)
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parse_option_buffer()
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dhcpv6()
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xxx_handler() (v6_handler)
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valid_reply() |
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manage lease (dhc6_leaseify(), ...) & state machine
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DHCPv4-over-DHCPv6 client, DHCPv4 side
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--------------------------------------
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State machine (including startup and timeouts)
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send_<message_type>()
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send_dhcpv4_query() |
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V |
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to DHCPv6 side |
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add_timeout() (for retry)
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from DHCPv6 side
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dhcpv4o6_handler() (including DHCP4o6 IPC state machine)
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recv_dhcpv4_response()
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parse_options()
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bootp()/dhcp() (cf DHCPv4 client)
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DHCPv4-over-DHCPv6 client, DHCPv6 side
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--------------------------------------
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I/O receive handler got_one_v6()
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do_packet6() (dhcpv6_packet_handler) (relayed, dhcpv4 or direct message)
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parse_option_buffer()
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dhcpv6()
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forw_dhcpv4_response() (when the message is a DHCPv4-response)
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to DHCPv4 side
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from DHCPv4 side
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dhcpv4o6_handler() (including DHCP4o6 IPC state machine)
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forw_dhcpv4_query()
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send_packet6() to all DHCP4o6 server addresses or multicast
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DHCPv4 server
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I/O receive handler got_one()
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receive_packet()
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do_packet() (bootp_packet_handler)
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parse_options() |
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bootp()/dhcp()
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locate_network()
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manage lease (find_lease*(), ...)
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dhcpxxx() |
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send_packet()
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DHCPv6 server
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I/O receive handler got_one_v6()
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receive_packet6()
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do_packet6() (dhcpv6_packet_handler) (relayed or direct message)
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parse_option_buffer()
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dhcpv6()
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build_dhcpv6_reply()
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send_packet6() |
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dhcpv6_<message_type>()
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valid_client_{msg,resp}()
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lease_to_client()/start_reply()/...
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DHCPv4-over-DHCPv6 server DHCPv4 side
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-------------------------------------
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from DHCPv6 side
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dhcpv4o6_handler()
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recv_dhcpv4_query()
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inline code from do_packet6(), e.g., parse_option_buffer()
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inline code from dhcpv6(), e.g., build_dhcpv6_reply()
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to DHCPv6 side
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DHCPv4-over-DHCPv6 server DHCPv6 side
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-------------------------------------
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I/O receive handler got_one_v6()
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receive_packet6()
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do_packet6() (dhcpv6_packet_handler) (relayed or direct message)
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parse_option_buffer()
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dhcpv6()
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build_dhcpv6_reply() (relayed or direct message)
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forw_dhcpv4_query() |
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| dhcp4o6_relay_forw()
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to DHCPv4 side |
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parse_option_buffer()
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build_dhcpv6_reply() (recursive call)
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from DHCPv6 side
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dhcpv4o6_handler()
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send_dhcpv4_response()
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send_packet6()
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