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xapi/nm: Send non-empty dns to networkd when using IPv6 autoconf #6586

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edb0d81
xapi/nm: Send non-empty dns to networkd when using IPv6 autoconf
psafont Jul 11, 2025
bdbd975
xapi-idl/network: Remove code duplication for DNS persistence decisions
psafont Jul 11, 2025
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16 changes: 6 additions & 10 deletions ocaml/networkd/bin/network_server.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -554,7 +554,8 @@ module Interface = struct
let set_dns _ dbg ~name ~nameservers ~domains =
Debug.with_thread_associated dbg
(fun () ->
update_config name {(get_config name) with dns= (nameservers, domains)} ;
update_config name
{(get_config name) with dns= Some (nameservers, domains)} ;
debug "Configuring DNS for %s: nameservers: [%s]; domains: [%s]" name
(String.concat ", " (List.map Unix.string_of_inet_addr nameservers))
(String.concat ", " domains) ;
Expand Down Expand Up @@ -727,7 +728,7 @@ module Interface = struct
; ipv6_conf
; ipv6_gateway
; ipv4_routes
; dns= nameservers, domains
; dns
; mtu
; ethtool_settings
; ethtool_offload
Expand All @@ -736,15 +737,10 @@ module Interface = struct
) ) ->
update_config name c ;
exec (fun () ->
(* We only apply the DNS settings when not in a DHCP mode
to avoid conflicts. The `dns` field
should really be an option type so that we don't have to
derive the intention of the caller by looking at other
fields. *)
match (ipv4_conf, ipv6_conf) with
| Static4 _, _ | _, Static6 _ | _, Autoconf6 ->
match dns with
| Some (nameservers, domains) ->
set_dns () dbg ~name ~nameservers ~domains
| _ ->
| None ->
()
) ;
exec (fun () -> set_ipv4_conf dbg name ipv4_conf) ;
Expand Down
29 changes: 17 additions & 12 deletions ocaml/networkd/bin_db/networkd_db.ml
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Expand Up @@ -74,20 +74,25 @@ let _ =
[("gateway", Unix.string_of_inet_addr addr)]
in
let dns =
let dns' =
List.map Unix.string_of_inet_addr (fst interface_config.dns)
in
if dns' = [] then
[]
else
[("dns", String.concat "," dns')]
interface_config.dns
|> Option.map fst
|> Option.map (List.map Unix.string_of_inet_addr)
|> Option.fold ~none:[] ~some:(function
| [] ->
[]
| dns' ->
[("dns", String.concat "," dns')]
)
in
let domains =
let domains' = snd interface_config.dns in
if domains' = [] then
[]
else
[("domain", String.concat "," domains')]
interface_config.dns
|> Option.map snd
|> Option.fold ~none:[] ~some:(function
| [] ->
[]
| domains' ->
[("domain", String.concat "," domains')]
)
in
mode @ addrs @ gateway @ dns @ domains
| None4 ->
Expand Down
15 changes: 8 additions & 7 deletions ocaml/networkd/lib/network_config.ml
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Expand Up @@ -37,7 +37,6 @@ let bridge_naming_convention (device : string) =
let get_list_from ~sep ~key args =
List.assoc_opt key args
|> Option.map (fun v -> Astring.String.cuts ~empty:false ~sep v)
|> Option.value ~default:[]

let parse_ipv4_config args = function
| Some "static" ->
Expand Down Expand Up @@ -73,11 +72,13 @@ let parse_ipv6_config args = function
(None6, None)

let parse_dns_config args =
let nameservers =
get_list_from ~sep:"," ~key:"DNS" args |> List.map Unix.inet_addr_of_string
let ( let* ) = Option.bind in
let* nameservers =
get_list_from ~sep:"," ~key:"DNS" args
|> Option.map (List.map Unix.inet_addr_of_string)
in
let domains = get_list_from ~sep:" " ~key:"DOMAIN" args in
(nameservers, domains)
let* domains = get_list_from ~sep:" " ~key:"DOMAIN" args in
Some (nameservers, domains)

let read_management_conf () =
try
Expand All @@ -103,15 +104,15 @@ let read_management_conf () =
let device =
(* Take 1st member of bond *)
match (bond_mode, bond_members) with
| None, _ | _, [] -> (
| None, _ | _, (None | Some []) -> (
match List.assoc_opt "LABEL" args with
| Some x ->
x
| None ->
error "%s: missing LABEL in %s" __FUNCTION__ management_conf ;
raise Read_error
)
| _, hd :: _ ->
| _, Some (hd :: _) ->
hd
in
Inventory.reread_inventory () ;
Expand Down
7 changes: 5 additions & 2 deletions ocaml/xapi-idl/network/network_interface.ml
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Expand Up @@ -158,7 +158,10 @@ type interface_config_t = {
; ipv6_conf: ipv6 [@default None6]
; ipv6_gateway: Unix.inet_addr option [@default None]
; ipv4_routes: ipv4_route_t list [@default []]
; dns: Unix.inet_addr list * string list [@default [], []]
; dns: (Unix.inet_addr list * string list) option [@default None]
(** the list
of nameservers and domains to persist in /etc/resolv.conf. Must be None when
using a DHCP mode *)
; mtu: int [@default 1500]
; ethtool_settings: (string * string) list [@default []]
; ethtool_offload: (string * string) list [@default [("lro", "off")]]
Expand Down Expand Up @@ -200,7 +203,7 @@ let default_interface =
; ipv6_conf= None6
; ipv6_gateway= None
; ipv4_routes= []
; dns= ([], [])
; dns= None
; mtu= 1500
; ethtool_settings= []
; ethtool_offload= [("lro", "off")]
Expand Down
17 changes: 7 additions & 10 deletions ocaml/xapi/nm.ml
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Expand Up @@ -634,28 +634,25 @@ let bring_pif_up ~__context ?(management_interface = false) (pif : API.ref_PIF)
rc.API.pIF_ip_configuration_mode = `Static
| `IPv6 ->
rc.API.pIF_ipv6_configuration_mode = `Static
|| rc.API.pIF_ipv6_configuration_mode = `Autoconf
in
let dns =
match (static, rc.API.pIF_DNS) with
| false, _ | true, "" ->
([], [])
None
| true, pif_dns ->
let nameservers =
List.map Unix.inet_addr_of_string
(String.split ',' pif_dns)
(String.split_on_char ',' pif_dns)
in
let domains =
match List.assoc_opt "domain" rc.API.pIF_other_config with
| None ->
| None | Some "" ->
[]
| Some domains -> (
try String.split ',' domains
with _ ->
warn "Invalid DNS search domains: %s" domains ;
[]
)
| Some domains ->
String.split_on_char ',' domains
in
(nameservers, domains)
Some (nameservers, domains)
in
let mtu = determine_mtu rc net_rc in
let ethtool_settings, ethtool_offload =
Expand Down
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