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