mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git
synced 2026-05-17 23:58:09 +02:00
11832e2ba3
It is possible that an ra leads to two routes having the same prefix as well as the same prefix length. One of them, however, refers to the on-link prefix, and the other one to a route from the route information field. (Moreover, they might have different route preferences.) Hence, if both routes differ in the on-link property, both are added, and the route from the route information option receives a metric penalty. Fixed #1163.
287 lines
9.8 KiB
C
287 lines
9.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2013 Red Hat, Inc.
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*/
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#ifndef __NETWORKMANAGER_NDISC_H__
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#define __NETWORKMANAGER_NDISC_H__
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#include <stdlib.h>
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#include <netinet/in.h>
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#include "nm-compat-headers/linux/if_addr.h"
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#include "nm-setting-ip6-config.h"
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#include "NetworkManagerUtils.h"
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#include "libnm-platform/nm-platform.h"
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#include "libnm-platform/nmp-object.h"
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#define NM_RA_TIMEOUT_DEFAULT ((guint32) 0)
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#define NM_RA_TIMEOUT_INFINITY ((guint32) G_MAXINT32)
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#define NM_TYPE_NDISC (nm_ndisc_get_type())
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#define NM_NDISC(obj) (_NM_G_TYPE_CHECK_INSTANCE_CAST((obj), NM_TYPE_NDISC, NMNDisc))
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#define NM_NDISC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), NM_TYPE_NDISC, NMNDiscClass))
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#define NM_IS_NDISC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), NM_TYPE_NDISC))
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#define NM_IS_NDISC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), NM_TYPE_NDISC))
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#define NM_NDISC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), NM_TYPE_NDISC, NMNDiscClass))
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#define NM_NDISC_CONFIG "config"
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#define NM_NDISC_CONFIG_RECEIVED "config-received"
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#define NM_NDISC_RA_TIMEOUT_SIGNAL "ra-timeout-signal"
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typedef enum {
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NM_NDISC_DHCP_LEVEL_UNKNOWN,
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NM_NDISC_DHCP_LEVEL_NONE,
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NM_NDISC_DHCP_LEVEL_OTHERCONF,
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NM_NDISC_DHCP_LEVEL_MANAGED
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} NMNDiscDHCPLevel;
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const char *nm_ndisc_dhcp_level_to_string(NMNDiscDHCPLevel level);
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#define NM_NDISC_INFINITY_U32 ((uint32_t) -1)
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/* It's important that this is G_MAXINT64, so that we can meaningfully do
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* MIN(e1, e2) to find the minimum expiry time (and properly handle if any
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* of them is infinity).
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*
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* While usually you assign this to "expiry_msec", you might say the
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* unit of it is milliseconds. But of course, infinity has not really a unit. */
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#define NM_NDISC_EXPIRY_INFINITY G_MAXINT64
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/* in common cases, the expiry_msec tracks the timestamp in nm_utils_get_monotonic_timestamp_mses()
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* timestamp when the item expires.
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*
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* When we configure an NMNDiscAddress to be announced via the router advertisement,
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* then that address does not have a fixed expiry point in time, instead, the expiry
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* really contains the lifetime from the moment when we send the router advertisement.
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* In that case, the expiry_msec is more a "lifetime" that starts counting at timestamp
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* zero.
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*
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* The unit is milliseconds (but of course, the timestamp is zero, so it doesn't really matter). */
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#define NM_NDISC_EXPIRY_BASE_TIMESTAMP ((gint64) 0)
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static inline gint64
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_nm_ndisc_lifetime_to_expiry(gint64 now_msec, guint32 lifetime)
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{
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if (lifetime == NM_NDISC_INFINITY_U32)
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return NM_NDISC_EXPIRY_INFINITY;
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return now_msec + (((gint64) lifetime) * 1000);
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}
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static inline gint64
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_nm_ndisc_lifetime_from_expiry(gint64 now_msec, gint64 expiry_msec, gboolean ceil)
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{
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gint64 diff;
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if (expiry_msec == NM_NDISC_EXPIRY_INFINITY)
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return NM_NDISC_INFINITY_U32;
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/* we don't expect nor handle integer overflow. The time stamp and expiry
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* should be reasonably small so that it cannot happen. */
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diff = expiry_msec - now_msec;
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if (diff <= 0)
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return 0;
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if (ceil) {
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/* we ceil() towards the next full second (instead of floor()). */
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diff += 999;
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}
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return NM_MIN(diff / 1000, (gint64) (G_MAXUINT32 - 1));
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}
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/*****************************************************************************/
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typedef struct _NMNDiscGateway {
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struct in6_addr address;
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gint64 expiry_msec;
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NMIcmpv6RouterPref preference;
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} NMNDiscGateway;
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typedef struct _NMNDiscAddress {
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struct in6_addr address;
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gint64 expiry_msec;
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gint64 expiry_preferred_msec;
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guint8 dad_counter;
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} NMNDiscAddress;
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typedef struct _NMNDiscRoute {
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struct in6_addr network;
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struct in6_addr gateway;
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gint64 expiry_msec;
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NMIcmpv6RouterPref preference;
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guint8 plen;
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bool on_link : 1;
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bool duplicate : 1;
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} NMNDiscRoute;
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typedef struct {
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struct in6_addr address;
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gint64 expiry_msec;
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} NMNDiscDNSServer;
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typedef struct {
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char *domain;
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gint64 expiry_msec;
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} NMNDiscDNSDomain;
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typedef enum {
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NM_NDISC_CONFIG_NONE = 0,
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NM_NDISC_CONFIG_DHCP_LEVEL = 1 << 0,
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NM_NDISC_CONFIG_GATEWAYS = 1 << 1,
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NM_NDISC_CONFIG_ADDRESSES = 1 << 2,
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NM_NDISC_CONFIG_ROUTES = 1 << 3,
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NM_NDISC_CONFIG_DNS_SERVERS = 1 << 4,
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NM_NDISC_CONFIG_DNS_DOMAINS = 1 << 5,
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NM_NDISC_CONFIG_HOP_LIMIT = 1 << 6,
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NM_NDISC_CONFIG_MTU = 1 << 7,
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NM_NDISC_CONFIG_REACHABLE_TIME = 1 << 8,
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NM_NDISC_CONFIG_RETRANS_TIMER = 1 << 9,
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} NMNDiscConfigMap;
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typedef enum {
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NM_NDISC_NODE_TYPE_INVALID,
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NM_NDISC_NODE_TYPE_HOST,
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NM_NDISC_NODE_TYPE_ROUTER,
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} NMNDiscNodeType;
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#define NM_NDISC_RFC4861_RTR_SOLICITATION_INTERVAL 4 /* seconds */
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#define NM_NDISC_RFC4861_MAX_RTR_SOLICITATION_DELAY 1 /* seconds */
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#define NM_NDISC_MAX_ADDRESSES_DEFAULT 16
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#define NM_NDISC_ROUTER_SOLICITATIONS_DEFAULT 3 /* RFC4861, MAX_RTR_SOLICITATIONS */
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#define NM_NDISC_ROUTER_ADVERTISEMENTS_DEFAULT 3 /* RFC4861, MAX_INITIAL_RTR_ADVERTISEMENTS */
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#define NM_NDISC_ROUTER_ADVERT_DELAY 3 /* RFC4861, MIN_DELAY_BETWEEN_RAS */
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#define NM_NDISC_ROUTER_ADVERT_INITIAL_INTERVAL 16 /* RFC4861, MAX_INITIAL_RTR_ADVERT_INTERVAL */
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#define NM_NDISC_ROUTER_ADVERT_DELAY_MS 500 /* RFC4861, MAX_RA_DELAY_TIME */
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#define NM_NDISC_ROUTER_ADVERT_MAX_INTERVAL 600 /* RFC4861, MaxRtrAdvInterval default */
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#define NM_NDISC_ROUTER_LIFETIME 900 /* 1.5 * NM_NDISC_ROUTER_ADVERT_MAX_INTERVAL */
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typedef struct {
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NML3Cfg *l3cfg;
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const char *ifname;
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const char *network_id;
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int max_addresses;
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int router_solicitations;
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int router_solicitation_interval;
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guint32 ra_timeout;
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NMUtilsStableType stable_type;
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NMSettingIP6ConfigAddrGenMode addr_gen_mode;
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NMNDiscNodeType node_type;
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NMSettingIP6ConfigPrivacy ip6_privacy;
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} NMNDiscConfig;
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struct _NMNDiscPrivate;
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struct _NMNDiscDataInternal;
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typedef struct {
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NMNDiscDHCPLevel dhcp_level;
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guint32 mtu;
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int hop_limit;
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guint32 reachable_time_ms;
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guint32 retrans_timer_ms;
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guint gateways_n;
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guint addresses_n;
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guint routes_n;
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guint dns_servers_n;
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guint dns_domains_n;
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const NMNDiscGateway *gateways;
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const NMNDiscAddress *addresses;
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const NMNDiscRoute *routes;
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const NMNDiscDNSServer *dns_servers;
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const NMNDiscDNSDomain *dns_domains;
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} NMNDiscData;
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/**
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* NMNDisc:
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*
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* Interface-specific structure that handles incoming router advertisements,
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* caches advertised items and removes them when they are obsolete.
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*/
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typedef struct {
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GObject parent;
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union {
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struct _NMNDiscPrivate *_priv;
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struct _NMNDiscDataInternal *rdata;
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};
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} NMNDisc;
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typedef struct {
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GObjectClass parent;
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void (*start)(NMNDisc *ndisc);
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void (*stop)(NMNDisc *ndisc);
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gboolean (*send_rs)(NMNDisc *ndisc, GError **error);
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gboolean (*send_ra)(NMNDisc *ndisc, GError **error);
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} NMNDiscClass;
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GType nm_ndisc_get_type(void);
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int nm_ndisc_get_ifindex(NMNDisc *self);
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const char *nm_ndisc_get_ifname(NMNDisc *self);
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NMNDiscNodeType nm_ndisc_get_node_type(NMNDisc *self);
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gboolean nm_ndisc_set_iid(NMNDisc *ndisc, const NMUtilsIPv6IfaceId iid, gboolean is_token);
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void nm_ndisc_start(NMNDisc *ndisc);
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void nm_ndisc_stop(NMNDisc *ndisc);
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void nm_ndisc_set_config(NMNDisc *ndisc, const NML3ConfigData *l3cd);
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NMNDiscConfigMap
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nm_ndisc_dad_failed(NMNDisc *ndisc, GArray *addresses, gboolean emit_changed_signal);
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NMPlatform *nm_ndisc_get_platform(NMNDisc *self);
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NMPNetns *nm_ndisc_netns_get(NMNDisc *self);
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gboolean nm_ndisc_netns_push(NMNDisc *self, NMPNetns **netns);
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static inline gboolean
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nm_ndisc_dad_addr_is_fail_candidate_event(NMPlatformSignalChangeType change_type,
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const NMPlatformIP6Address *addr)
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{
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return !NM_FLAGS_HAS(addr->n_ifa_flags, IFA_F_SECONDARY)
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&& ((change_type == NM_PLATFORM_SIGNAL_CHANGED && addr->n_ifa_flags & IFA_F_DADFAILED)
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|| (change_type == NM_PLATFORM_SIGNAL_REMOVED
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&& addr->n_ifa_flags & IFA_F_TENTATIVE));
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}
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static inline gboolean
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nm_ndisc_dad_addr_is_fail_candidate(NMPlatform *platform, const NMPObject *obj)
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{
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const NMPlatformIP6Address *addr;
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addr = NMP_OBJECT_CAST_IP6_ADDRESS(
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nm_platform_lookup_obj(platform, NMP_CACHE_ID_TYPE_OBJECT_TYPE, obj));
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if (addr
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&& (NM_FLAGS_HAS(addr->n_ifa_flags, IFA_F_SECONDARY)
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|| !NM_FLAGS_HAS(addr->n_ifa_flags, IFA_F_DADFAILED))) {
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/* the address still/again exists and is not in DADFAILED state. Skip it. */
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return FALSE;
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}
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return TRUE;
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}
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/*****************************************************************************/
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void nm_ndisc_get_sysctl(NMPlatform *platform,
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const char *ifname,
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int *out_max_addresses,
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int *out_router_solicitations,
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int *out_router_solicitation_interval,
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guint32 *out_default_ra_timeout);
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/*****************************************************************************/
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struct _NML3ConfigData;
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struct _NML3ConfigData *nm_ndisc_data_to_l3cd(NMDedupMultiIndex *multi_idx,
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int ifindex,
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const NMNDiscData *rdata,
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NMSettingIP6ConfigPrivacy ip6_privacy,
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NMUtilsIPv6IfaceId *token);
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#endif /* __NETWORKMANAGER_NDISC_H__ */
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