From 223f1b1eb3707f1d3ef91200dd616ee6c8b77db0 Mon Sep 17 00:00:00 2001 From: Ludovic Courtès Date: Sun, 17 Oct 2021 23:43:52 +0200 Subject: services: static-networking: Change interface to mimic netlink. * gnu/services/base.scm ()[interface, ip, netmask] [gateway]: Remove. [addresses, links, routes]: New fields. [requirement]: Default to '(udev). (, , ): New record types. (ensure-no-separate-netmask, %ensure-no-separate-netmask): Remove. (ipv6-address?, cidr->netmask, ip+netmask->cidr) (network-set-up/hurd, network-tear-down/hurd) (network-set-up/linux, network-tear-down/linux) (static-networking->hurd-pfinet-options): New procedures. (static-networking-shepherd-service): New procedure. (static-networking-shepherd-services): Rewrite in terms of the above. (static-networking-service): Deprecate. Adjust to new 'static-networking' API. (%base-services): Likewise. * gnu/system/install.scm (%installation-services): Likewise. * gnu/system/hurd.scm (%base-services/hurd): Likewise, and separate 'loopback' from 'networking'. * gnu/build/hurd-boot.scm (set-hurd-device-translators): Remove "servers/socket/2". * gnu/tests/networking.scm (run-openvswitch-test)["networking has started on ovs0"]: Check for 'networking instead of 'networking-ovs0, which is no longer provided. * doc/guix.texi (Networking Setup): Document the new interface. Remove documentation of 'static-networking-service'. (Virtualization Services): Change Ganeti example to use the new interface. --- gnu/services/base.scm | 425 +++++++++++++++++++++++++++++++++++--------------- 1 file changed, 296 insertions(+), 129 deletions(-) (limited to 'gnu/services') diff --git a/gnu/services/base.scm b/gnu/services/base.scm index 7008ab137c..d93ea6f063 100644 --- a/gnu/services/base.scm +++ b/gnu/services/base.scm @@ -35,6 +35,8 @@ (define-module (gnu services base) #:use-module (guix store) #:use-module (guix deprecation) + #:autoload (guix diagnostics) (warning) + #:autoload (guix i18n) (G_) #:use-module (gnu services) #:use-module (gnu services admin) #:use-module (gnu services shepherd) @@ -54,6 +56,7 @@ (define-module (gnu services base) #:use-module ((gnu packages base) #:select (coreutils glibc glibc-utf8-locales)) #:autoload (gnu packages guile-xyz) (guile-netlink) + #:autoload (gnu packages hurd) (hurd) #:use-module (gnu packages package-management) #:use-module ((gnu packages gnupg) #:select (guile-gcrypt)) #:use-module (gnu packages linux) @@ -84,14 +87,32 @@ (define-module (gnu services base) virtual-terminal-service-type static-networking - static-networking? - static-networking-interface - static-networking-ip - static-networking-netmask - static-networking-gateway + static-networking-addresses + static-networking-links + static-networking-routes static-networking-requirement + network-address + network-address? + network-address-device + network-address-value + network-address-ipv6? + + network-link + network-link? + network-link-name + network-link-type + network-link-arguments + + network-route + network-route? + network-route-destination + network-route-source + network-route-device + network-route-ipv6? + network-route-gateway + static-networking-service static-networking-service-type @@ -2355,113 +2376,267 @@ (define kmscon-command (description "Start the @command{kmscon} virtual terminal emulator for the Linux @dfn{kernel mode setting} (KMS)."))) + +;;; +;;; Static networking. +;;; + +(define (ipv6-address? str) + "Return true if STR denotes an IPv6 address." + (false-if-exception (->bool (inet-pton AF_INET6 str)))) + (define-record-type* static-networking make-static-networking static-networking? - (interface static-networking-interface) - (ip static-networking-ip) - (netmask static-networking-netmask - (default #f)) - (gateway static-networking-gateway ;FIXME: doesn't belong here - (default #f)) + (addresses static-networking-addresses) ;list of + (links static-networking-links (default '())) ;list of + (routes static-networking-routes (default '())) ;list of (provision static-networking-provision - (default #f)) + (default '(networking))) (requirement static-networking-requirement - (default '())) + (default '(udev))) (name-servers static-networking-name-servers ;FIXME: doesn't belong here (default '()))) -(define static-networking-shepherd-service +(define-record-type* + network-address make-network-address + network-address? + (device network-address-device) ;string--e.g., "en01" + (value network-address-value) ;string--CIDR notation + (ipv6? network-address-ipv6? ;Boolean + (thunked) + (default + (ipv6-address? (cidr->ip (network-address-value this-record)))))) + +(define-record-type* + network-link make-network-link + network-link? + (name network-link-name) ;string--e.g, "v0p0" + (type network-link-type) ;symbol--e.g.,'veth + (arguments network-link-arguments)) ;list + +(define-record-type* + network-route make-network-route + network-route? + (destination network-route-destination) + (source network-route-source (default #f)) + (device network-route-device (default #f)) + (ipv6? network-route-ipv6? (thunked) + (default + (or (ipv6-address? (network-route-destination this-record)) + (and=> (network-route-gateway this-record) + ipv6-address?)))) + (gateway network-route-gateway (default #f))) + +(define* (cidr->netmask str #:optional (family AF_INET)) + "Given @var{str}, a string in CIDR notation (e.g., \"1.2.3.4/24\"), return +the netmask as a string like \"255.255.255.0\"." + (match (string-split str #\/) + ((ip (= string->number bits)) + (let ((mask (ash (- (expt 2 bits) 1) + (- (if (= family AF_INET6) 128 32) + bits)))) + (inet-ntop family mask))) + (_ #f))) + +(define (cidr->ip str) + "Strip the netmask bit of @var{str}, a CIDR-notation IP/netmask address." + (match (string-split str #\/) + ((or (ip _) (ip)) + ip))) + +(define* (ip+netmask->cidr ip netmask #:optional (family AF_INET)) + "Return the CIDR notation (a string) for @var{ip} and @var{netmask}, two +@var{family} address strings, where @var{family} is @code{AF_INET} or +@code{AF_INET6}." + (let* ((netmask (inet-pton family netmask)) + (bits (logcount netmask))) + (string-append ip "/" (number->string bits)))) + +(define (static-networking->hurd-pfinet-options config) + "Return command-line options for the Hurd's pfinet translator corresponding +to CONFIG." + (unless (null? (static-networking-links config)) + ;; XXX: Presumably this is not supported, or perhaps could be approximated + ;; by running separate pfinet instances in some cases? + (warning (G_ "network links are currently ignored on GNU/Hurd~%"))) + + (match (static-networking-addresses config) + ((and addresses (first _ ...)) + `("--ipv6" "/servers/socket/26" + "--interface" ,(network-address-device first) + ,@(append-map (lambda (address) + `(,(if (network-address-ipv6? address) + "--address6" + "--address") + ,(cidr->ip (network-address-value address)) + ,@(match (cidr->netmask (network-address-value address) + (if (network-address-ipv6? address) + AF_INET6 + AF_INET)) + (#f '()) + (mask (list "--netmask" mask))))) + addresses) + ,@(append-map (lambda (route) + (match route + (($ "default" #f device _ gateway) + (if (network-route-ipv6? route) + `("--gateway6" ,gateway) + `("--gateway" ,gateway))) + (($ destination) + (warning (G_ "ignoring network route for '~a'~%") + destination) + '()))) + (static-networking-routes config)))))) + +(define (network-set-up/hurd config) + "Set up networking for the Hurd." + ;; The Hurd implements SIOCGIFADDR and other old-style ioctls, but the only + ;; way to set up IPv6 is by starting pfinet with the right options. + (if (equal? (static-networking-provision config) '(loopback)) + (scheme-file "set-up-pflocal" #~(begin 'nothing-to-do! #t)) + (scheme-file "set-up-pfinet" + (with-imported-modules '((guix build utils)) + #~(begin + (use-modules (guix build utils) + (ice-9 format)) + + ;; TODO: Do that without forking. + (let ((options '#$(static-networking->hurd-pfinet-options + config))) + (format #t "starting '~a~{ ~s~}'~%" + #$(file-append hurd "/hurd/pfinet") + options) + (apply invoke #$(file-append hurd "/bin/settrans") "-fac" + "/servers/socket/2" + #$(file-append hurd "/hurd/pfinet") + options))))))) + +(define (network-tear-down/hurd config) + (scheme-file "tear-down-pfinet" + (with-imported-modules '((guix build utils)) + #~(begin + (use-modules (guix build utils)) + + ;; Forcefully terminate pfinet. XXX: In theory this + ;; should just undo the addresses and routes of CONFIG; + ;; this could be done using ioctls like SIOCDELRT, but + ;; these are IPv4-only; another option would be to use + ;; fsysopts but that seems to crash pfinet. + (invoke #$(file-append hurd "/bin/settrans") "-fg" + "/servers/socket/2") + #f)))) + +(define network-set-up/linux (match-lambda - (($ interface ip netmask gateway provision - requirement name-servers) + (($ addresses links routes) + (scheme-file "set-up-network" + (with-extensions (list guile-netlink) + #~(begin + (use-modules (ip addr) (ip link) (ip route)) + + #$@(map (lambda (address) + #~(begin + (addr-add #$(network-address-device address) + #$(network-address-value address) + #:ipv6? + #$(network-address-ipv6? address)) + ;; FIXME: loopback? + (link-set #$(network-address-device address) + #:up #t))) + addresses) + #$@(map (match-lambda + (($ name type arguments) + #~(link-add #$name #$type + #:type-args '#$arguments))) + links) + #$@(map (lambda (route) + #~(route-add #$(network-route-destination route) + #:device + #$(network-route-device route) + #:ipv6? + #$(network-route-ipv6? route) + #:via + #$(network-route-gateway route) + #:src + #$(network-route-source route))) + routes) + #t)))))) + +(define network-tear-down/linux + (match-lambda + (($ addresses links routes) + (scheme-file "tear-down-network" + (with-extensions (list guile-netlink) + #~(begin + (use-modules (ip addr) (ip link) (ip route) + (netlink error) + (srfi srfi-34)) + + (define-syntax-rule (false-if-netlink-error exp) + (guard (c ((netlink-error? c) #f)) + exp)) + + ;; Wrap calls in 'false-if-netlink-error' so this + ;; script goes as far as possible undoing the effects + ;; of "set-up-network". + + #$@(map (lambda (route) + #~(false-if-netlink-error + (route-del #$(network-route-destination route) + #:device + #$(network-route-device route) + #:ipv6? + #$(network-route-ipv6? route) + #:via + #$(network-route-gateway route) + #:src + #$(network-route-source route)))) + routes) + #$@(map (match-lambda + (($ name type arguments) + #~(false-if-netlink-error + (link-del #$name)))) + links) + #$@(map (lambda (address) + #~(false-if-netlink-error + (addr-del #$(network-address-device + address) + #$(network-address-value address) + #:ipv6? + #$(network-address-ipv6? address)))) + addresses) + #f)))))) + +(define (static-networking-shepherd-service config) + (match config + (($ addresses links routes + provision requirement name-servers) (let ((loopback? (and provision (memq 'loopback provision)))) - (define set-up-via-ioctl - #~(let* ((addr (inet-pton AF_INET #$ip)) - (sockaddr (make-socket-address AF_INET addr 0)) - (mask (and #$netmask (inet-pton AF_INET #$netmask))) - (maskaddr (and mask - (make-socket-address AF_INET mask 0))) - (gateway (and #$gateway - (inet-pton AF_INET #$gateway))) - (gatewayaddr (and gateway - (make-socket-address AF_INET - gateway 0)))) - (configure-network-interface #$interface sockaddr - (logior IFF_UP - #$(if loopback? - #~IFF_LOOPBACK - 0)) - #:netmask maskaddr) - (when gateway - (let ((sock (socket AF_INET SOCK_DGRAM 0))) - (add-network-route/gateway sock gatewayaddr) - (close-port sock))))) - - (define tear-down-via-ioctl - #~(let ((sock (socket AF_INET SOCK_STREAM 0))) - (when #$gateway - (delete-network-route sock - (make-socket-address AF_INET - INADDR_ANY 0))) - (set-network-interface-flags sock #$interface 0) - (close-port sock) - #f)) - - (define set-up-via-netlink - (with-extensions (list guile-netlink) - #~(let ((ip #$(if netmask - #~(ip+netmask->cidr #$ip #$netmask) - ip))) - (addr-add #$interface ip) - (when #$gateway - (route-add "default" #:device #$interface - #:via #$gateway)) - (link-set #$interface #:up #t)))) - - (define tear-down-via-netlink - (with-extensions (list guile-netlink) - #~(begin - (link-set #$interface #:down #t) - (when #$gateway - (route-del "default" #:device #$interface)) - (addr-del #$interface #$ip) - #f))) - - (define helpers - #~(define (ip+netmask->cidr ip netmask) - ;; Return the CIDR notation (a string) for IP and NETMASK, two - ;; IPv4 address strings. - (let* ((netmask (inet-pton AF_INET netmask)) - (bits (logcount netmask))) - (string-append ip "/" (number->string bits))))) - (shepherd-service (documentation "Bring up the networking interface using a static IP address.") (requirement requirement) - (provision (or provision - (list (symbol-append 'networking- - (string->symbol interface))))) + (provision provision) (start #~(lambda _ ;; Return #t if successfully started. - #$helpers - (if (string-contains %host-type "-linux") - #$set-up-via-netlink - #$set-up-via-ioctl))) + (load #$(let-system (system target) + (if (string-contains (or target system) "-linux") + (network-set-up/linux config) + (network-set-up/hurd config)))))) (stop #~(lambda _ ;; Return #f is successfully stopped. - (if (string-contains %host-type "-linux") - #$tear-down-via-netlink - #$tear-down-via-ioctl))) - (modules `((ip addr) - (ip link) - (ip route) - ,@%default-modules)) + (load #$(let-system (system target) + (if (string-contains (or target system) "-linux") + (network-tear-down/linux config) + (network-tear-down/hurd config)))))) (respawn? #f)))))) +(define (static-networking-shepherd-services networks) + (map static-networking-shepherd-service networks)) + (define (static-networking-etc-files interfaces) "Return a /etc/resolv.conf entry for INTERFACES or the empty list." (match (delete-duplicates @@ -2480,30 +2655,6 @@ (define (static-networking-etc-files interfaces) # Generated by 'static-networking-service'.\n" content)))))))) -(define (static-networking-shepherd-services interfaces) - "Return the list of Shepherd services to bring up INTERFACES, a list of - objects." - (define (loopback? service) - (memq 'loopback (shepherd-service-provision service))) - - (let ((services (map static-networking-shepherd-service interfaces))) - (match (remove loopback? services) - (() - ;; There's no interface other than 'loopback', so we assume that the - ;; 'networking' service will be provided by dhclient or similar. - services) - ((non-loopback ...) - ;; Assume we're providing all the interfaces, and thus, provide a - ;; 'networking' service. - (cons (shepherd-service - (provision '(networking)) - (requirement (append-map shepherd-service-provision - services)) - (start #~(const #t)) - (stop #~(const #f)) - (documentation "Bring up all the networking interfaces.")) - services))))) - (define static-networking-service-type ;; The service type for statically-defined network interfaces. (service-type (name 'static-networking) @@ -2521,12 +2672,13 @@ (define static-networking-service-type services of this type is a list of @code{static-networking} objects, one per network interface."))) -(define* (static-networking-service interface ip - #:key - netmask gateway provision - ;; Most interfaces require udev to be usable. - (requirement '(udev)) - (name-servers '())) +(define-deprecated (static-networking-service interface ip + #:key + netmask gateway provision + ;; Most interfaces require udev to be usable. + (requirement '(udev)) + (name-servers '())) + static-networking-service-type "Return a service that starts @var{interface} with address @var{ip}. If @var{netmask} is true, use it as the network mask. If @var{gateway} is true, it must be a string specifying the default network gateway. @@ -2537,11 +2689,24 @@ (define* (static-networking-service interface ip to handle." (simple-service 'static-network-interface static-networking-service-type - (list (static-networking (interface interface) (ip ip) - (netmask netmask) (gateway gateway) - (provision provision) - (requirement requirement) - (name-servers name-servers))))) + (list (static-networking + (addresses + (list (network-address + (device interface) + (value (if netmask + (ip+netmask->cidr ip netmask) + ip)) + (ipv6? #f)))) + (routes + (if gateway + (list (network-route + (destination "default") + (gateway gateway) + (ipv6? #f))) + '())) + (requirement requirement) + (provision (or provision '(networking))) + (name-servers name-servers))))) (define %base-services @@ -2573,10 +2738,12 @@ (define %base-services (tty "tty6"))) (service static-networking-service-type - (list (static-networking (interface "lo") - (ip "127.0.0.1") - (requirement '()) - (provision '(loopback))))) + (list (static-networking + (addresses (list (network-address + (device "lo") + (value "127.0.0.1")))) + (requirement '()) + (provision '(loopback))))) (syslog-service) (service urandom-seed-service-type) (service guix-service-type) -- cgit v1.2.3