summaryrefslogtreecommitdiffstats
path: root/src/vnet/dhcp/dhcp6_pd_doc.md
diff options
context:
space:
mode:
authorJuraj Sloboda <jsloboda@cisco.com>2018-05-25 14:02:20 +0200
committerOle Trøan <otroan@employees.org>2018-06-08 20:39:05 +0000
commit81119e86bdf47f41f06218f91e52024bc4d00e7c (patch)
tree8aaca952221133e7ffad441c3018c27d549d8e29 /src/vnet/dhcp/dhcp6_pd_doc.md
parent898cd8f83d56ece9df9f02d54170a96f7cf6d500 (diff)
Implement DHCPv6 PD client (VPP-718, VPP-1050)
Change-Id: I72a1ccdfdd5573335ef78fc01d5268934c73bd31 Signed-off-by: Juraj Sloboda <jsloboda@cisco.com>
Diffstat (limited to 'src/vnet/dhcp/dhcp6_pd_doc.md')
-rw-r--r--src/vnet/dhcp/dhcp6_pd_doc.md86
1 files changed, 86 insertions, 0 deletions
diff --git a/src/vnet/dhcp/dhcp6_pd_doc.md b/src/vnet/dhcp/dhcp6_pd_doc.md
new file mode 100644
index 00000000000..0d0e0865f1b
--- /dev/null
+++ b/src/vnet/dhcp/dhcp6_pd_doc.md
@@ -0,0 +1,86 @@
+# DHCPv6 prefix delegation {#dhcp6_pd_doc}
+
+DHCPv6 prefix delegation client implementation is split between Control Plane and Data Plane.
+Data Plane can also be used alone by external application (external Control Plane) using Data Plane Binary API.
+
+Number of different IA\_PDs managed by VPP is currently limited to 1 (and corresponding IAID has value 1).
+Client ID is of type DUID-LLT (Link Layer address plus time) and is created on VPP startup from avaliable interfaces (or chosen at random for debugging purposes).
+Server ID is only visible to Data Plane. Control Plane identifies servers by a 32-bit handle (server\_index) mapped to Server ID by Data Plane.
+
+## Control Plane
+
+DHCPv6 PD clients are configured per interface.
+When configuring a PD client we have to choose a name of a prefix group for that client.
+Each prefix obtained through this client will be flagged as belonging to specified prefix group.
+The prefix groups are used as a filter by prefix consumers.
+
+To enable client on particular interface call Binary API function dhcp6\_pd\_client\_enable\_disable with param 'sw\_if\_index' set to that interface,
+'prefix\_group' set to prefix group name and 'enable' set to true.
+Format of corresponding Debug CLI command is: "dhcp6 pd client <interface> [disable]"
+
+To add/delete IPv6 address potentially using available prefix from specified prefix group call Binary API command ip6\_add\_del\_address\_using\_prefix with parameters:
+> sw\_if\_index - software interface index of interface to add/delete address to/from
+> prefix\_group - name of prefix group, prefix\_group[0] == '\0' means no prefix should be used
+> address - address or suffix to be used with a prefix from selected group
+> prefix\_length - subnet prefix for the address
+> is\_add - 1 for add, 0 for remove
+or Debug CLI command with format: "set ip6 addresses <interface> [prefix group <n>] <address> [del]"
+
+When no prefix is avaliable, no address is physically added, but is added once a prefix becomes avaliable.
+Address is removed when all available prefixes are removed.
+When a used prefix is removed and there is other available prefix, the address that used the prefix is reconfigured using the available prefix.
+
+There are three debug CLI commands (with no parameters) used to show the state of clients, prefixes and addresses:
+ show ip6 pd clients
+ show ip6 prefixes
+ show ip6 addresses
+
+### Example configuration
+
+set int state GigabitEthernet0/8/0 up
+dhcp6 pd client GigabitEthernet0/8/0 prefix group my-dhcp6-pd-group
+set ip6 address GigabitEthernet0/8/0 prefix group my-dhcp6-pd-group ::7/64
+
+## Data Plane
+
+First API message to be called is dhcp6\_clients\_enable\_disable with enable parameter set to 1.
+It enables DHCPv6 client subsystem to receive UDP messages containing DHCPv6 client port (sets the router to DHCPv6 client mode).
+This is to ensure client subsystem gets the messages instead of DHCPv6 proxy subsystem.
+
+There is one common Binary API call for sending DHCPv6 client messages (dhcp6\_pd\_send\_client\_message) with these fields:
+> msg\_type - message type (e.g. Solicit)
+> sw\_if\_index - index of TX interface
+> server\_index - used to dentify DHCPv6 server,
+ unique for each DHCPv6 server on the link,
+ value obrtained from dhcp6\_pd\_reply\_event API message,
+ use ~0 to send message to all DHCPv6 servers
+> param irt - initial retransmission time
+> param mrt - maximum retransmission time
+> param mrc - maximum retransmission count
+> param mrd - maximum retransmission duration for sending the message
+> stop - if non-zero then stop resending the message, otherwise start sending the message
+> T1 - value of T1 in IA\_PD option
+> T2 - value of T2 in IA\_PD option
+> prefixes - list of prefixes in IA\_PD option
+
+The message is automatically resent by Data Plane based on parameters 'irt', 'mrt', 'mrc' and 'mrd'.
+To stop the resending call the same function (same msg\_type is sufficient) with 'stop' set to 1.
+
+To subscribe for notifications of DHCPv6 messages from server call Binary API function
+want\_dhcp6\_pd\_reply\_events with enable\_disable set to 1
+Notification (dhcp6\_pd\_reply\_event) fileds are:
+> sw\_if\_index - index of RX interface
+> server\_index - used to dentify DHCPv6 server, unique for each DHCPv6 server on the link
+> msg\_type - message type
+> T1 - value of T1 in IA\_PD option
+> T2 - value of T2 in IA\_PD option
+> inner\_status\_code - value of status code inside IA\_PD option
+> status\_code - value of status code
+> preference - value of preference option in reply message
+> prefixes - list of prefixes in IA\_PD option
+
+Prefix is a struct with with these fields:
+> prefix - prefix bytes
+> prefix\_length - prefix length
+> valid\_time - valid lifetime
+> preferred\_time - preferred lifetime