| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| /*** |
| Copyright © 2014 Intel Corporation. All rights reserved. |
| ***/ |
| |
| #include <arpa/inet.h> |
| #include <netinet/icmp6.h> |
| #include <linux/if.h> |
| #include <linux/if_arp.h> |
| |
| #include "sd-ndisc.h" |
| |
| #include "event-util.h" |
| #include "missing_network.h" |
| #include "networkd-address-generation.h" |
| #include "networkd-address.h" |
| #include "networkd-dhcp6.h" |
| #include "networkd-manager.h" |
| #include "networkd-ndisc.h" |
| #include "networkd-queue.h" |
| #include "networkd-route.h" |
| #include "networkd-state-file.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "strv.h" |
| |
| #define NDISC_DNSSL_MAX 64U |
| #define NDISC_RDNSS_MAX 64U |
| |
| bool link_ipv6_accept_ra_enabled(Link *link) { |
| assert(link); |
| |
| if (!socket_ipv6_is_supported()) |
| return false; |
| |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (link->iftype == ARPHRD_CAN) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| if (!link_may_have_ipv6ll(link, /* check_multicast = */ true)) |
| return false; |
| |
| assert(link->network->ipv6_accept_ra >= 0); |
| return link->network->ipv6_accept_ra; |
| } |
| |
| void network_adjust_ipv6_accept_ra(Network *network) { |
| assert(network); |
| |
| if (!FLAGS_SET(network->link_local, ADDRESS_FAMILY_IPV6)) { |
| if (network->ipv6_accept_ra > 0) |
| log_warning("%s: IPv6AcceptRA= is enabled but IPv6 link-local addressing is disabled or not supported. " |
| "Disabling IPv6AcceptRA=.", network->filename); |
| network->ipv6_accept_ra = false; |
| } |
| |
| if (network->ipv6_accept_ra < 0) |
| /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */ |
| network->ipv6_accept_ra = !FLAGS_SET(network->ip_forward, ADDRESS_FAMILY_IPV6); |
| |
| /* When RouterAllowList=, PrefixAllowList= or RouteAllowList= are specified, then |
| * RouterDenyList=, PrefixDenyList= or RouteDenyList= are ignored, respectively. */ |
| if (!set_isempty(network->ndisc_allow_listed_router)) |
| network->ndisc_deny_listed_router = set_free_free(network->ndisc_deny_listed_router); |
| if (!set_isempty(network->ndisc_allow_listed_prefix)) |
| network->ndisc_deny_listed_prefix = set_free_free(network->ndisc_deny_listed_prefix); |
| if (!set_isempty(network->ndisc_allow_listed_route_prefix)) |
| network->ndisc_deny_listed_route_prefix = set_free_free(network->ndisc_deny_listed_route_prefix); |
| } |
| |
| static int ndisc_check_ready(Link *link); |
| |
| static int ndisc_address_ready_callback(Address *address) { |
| Address *a; |
| |
| assert(address); |
| assert(address->link); |
| |
| SET_FOREACH(a, address->link->addresses) |
| if (a->source == NETWORK_CONFIG_SOURCE_NDISC) |
| a->callback = NULL; |
| |
| return ndisc_check_ready(address->link); |
| } |
| |
| static int ndisc_check_ready(Link *link) { |
| bool found = false, ready = false; |
| Address *address; |
| |
| assert(link); |
| |
| if (link->ndisc_messages > 0) { |
| log_link_debug(link, "%s(): SLAAC addresses and routes are not set.", __func__); |
| return 0; |
| } |
| |
| SET_FOREACH(address, link->addresses) { |
| if (address->source != NETWORK_CONFIG_SOURCE_NDISC) |
| continue; |
| |
| found = true; |
| |
| if (address_is_ready(address)) { |
| ready = true; |
| break; |
| } |
| } |
| |
| if (found && !ready) { |
| SET_FOREACH(address, link->addresses) |
| if (address->source == NETWORK_CONFIG_SOURCE_NDISC) |
| address->callback = ndisc_address_ready_callback; |
| |
| log_link_debug(link, "%s(): no SLAAC address is ready.", __func__); |
| return 0; |
| } |
| |
| link->ndisc_configured = true; |
| log_link_debug(link, "SLAAC addresses and routes set."); |
| |
| link_check_ready(link); |
| return 0; |
| } |
| |
| static int ndisc_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { |
| int r; |
| |
| assert(link); |
| |
| r = route_configure_handler_internal(rtnl, m, link, "Could not set NDisc route"); |
| if (r <= 0) |
| return r; |
| |
| r = ndisc_check_ready(link); |
| if (r < 0) |
| link_enter_failed(link); |
| |
| return 1; |
| } |
| |
| static void ndisc_set_route_priority(Link *link, Route *route) { |
| assert(link); |
| assert(route); |
| |
| if (route->priority_set) |
| return; /* explicitly configured. */ |
| |
| switch (route->pref) { |
| case SD_NDISC_PREFERENCE_LOW: |
| route->priority = link->network->ipv6_accept_ra_route_metric_low; |
| break; |
| case SD_NDISC_PREFERENCE_MEDIUM: |
| route->priority = link->network->ipv6_accept_ra_route_metric_medium; |
| break; |
| case SD_NDISC_PREFERENCE_HIGH: |
| route->priority = link->network->ipv6_accept_ra_route_metric_high; |
| break; |
| default: |
| assert_not_reached(); |
| } |
| } |
| |
| static int ndisc_request_route(Route *in, Link *link, sd_ndisc_router *rt) { |
| _cleanup_(route_freep) Route *route = in; |
| struct in6_addr router; |
| bool is_new; |
| int r; |
| |
| assert(route); |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return r; |
| |
| route->source = NETWORK_CONFIG_SOURCE_NDISC; |
| route->provider.in6 = router; |
| if (!route->table_set) |
| route->table = link_get_ipv6_accept_ra_route_table(link); |
| ndisc_set_route_priority(link, route); |
| if (!route->protocol_set) |
| route->protocol = RTPROT_RA; |
| if (route->quickack < 0) |
| route->quickack = link->network->ipv6_accept_ra_quickack; |
| |
| is_new = route_get(NULL, link, route, NULL) < 0; |
| |
| r = link_request_route(link, TAKE_PTR(route), true, &link->ndisc_messages, |
| ndisc_route_handler, NULL); |
| if (r < 0) |
| return r; |
| if (r > 0 && is_new) |
| link->ndisc_configured = false; |
| |
| return 0; |
| } |
| |
| static int ndisc_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) { |
| int r; |
| |
| assert(link); |
| |
| r = address_configure_handler_internal(rtnl, m, link, "Could not set NDisc address"); |
| if (r <= 0) |
| return r; |
| |
| r = ndisc_check_ready(link); |
| if (r < 0) |
| link_enter_failed(link); |
| |
| return 1; |
| } |
| |
| static int ndisc_request_address(Address *in, Link *link, sd_ndisc_router *rt) { |
| _cleanup_(address_freep) Address *address = in; |
| struct in6_addr router; |
| bool is_new; |
| int r; |
| |
| assert(address); |
| assert(link); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return r; |
| |
| address->source = NETWORK_CONFIG_SOURCE_NDISC; |
| address->provider.in6 = router; |
| |
| r = free_and_strdup_warn(&address->netlabel, link->network->ndisc_netlabel); |
| if (r < 0) |
| return r; |
| |
| is_new = address_get(link, address, NULL) < 0; |
| |
| r = link_request_address(link, TAKE_PTR(address), true, &link->ndisc_messages, |
| ndisc_address_handler, NULL); |
| if (r < 0) |
| return r; |
| if (r > 0 && is_new) |
| link->ndisc_configured = false; |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) { |
| usec_t lifetime_usec, timestamp_usec; |
| struct in6_addr gateway; |
| uint16_t lifetime_sec; |
| unsigned preference; |
| uint32_t mtu = 0; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| if (!link->network->ipv6_accept_ra_use_gateway && |
| hashmap_isempty(link->network->routes_by_section)) |
| return 0; |
| |
| r = sd_ndisc_router_get_lifetime(rt, &lifetime_sec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get gateway lifetime from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| lifetime_usec = sec16_to_usec(lifetime_sec, timestamp_usec); |
| |
| r = sd_ndisc_router_get_address(rt, &gateway); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m"); |
| |
| if (link_get_ipv6_address(link, &gateway, 0, NULL) >= 0) { |
| if (DEBUG_LOGGING) |
| log_link_debug(link, "No NDisc route added, gateway %s matches local address", |
| IN6_ADDR_TO_STRING(&gateway)); |
| return 0; |
| } |
| |
| r = sd_ndisc_router_get_preference(rt, &preference); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get default router preference from RA: %m"); |
| |
| if (link->network->ipv6_accept_ra_use_mtu) { |
| r = sd_ndisc_router_get_mtu(rt, &mtu); |
| if (r < 0 && r != -ENODATA) |
| return log_link_error_errno(link, r, "Failed to get default router MTU from RA: %m"); |
| } |
| |
| if (link->network->ipv6_accept_ra_use_gateway) { |
| _cleanup_(route_freep) Route *route = NULL; |
| |
| r = route_new(&route); |
| if (r < 0) |
| return log_oom(); |
| |
| route->family = AF_INET6; |
| route->pref = preference; |
| route->gw_family = AF_INET6; |
| route->gw.in6 = gateway; |
| route->lifetime_usec = lifetime_usec; |
| route->mtu = mtu; |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request default route: %m"); |
| } |
| |
| Route *route_gw; |
| HASHMAP_FOREACH(route_gw, link->network->routes_by_section) { |
| _cleanup_(route_freep) Route *route = NULL; |
| |
| if (!route_gw->gateway_from_dhcp_or_ra) |
| continue; |
| |
| if (route_gw->gw_family != AF_INET6) |
| continue; |
| |
| r = route_dup(route_gw, &route); |
| if (r < 0) |
| return r; |
| |
| route->gw.in6 = gateway; |
| if (!route->pref_set) |
| route->pref = preference; |
| route->lifetime_usec = lifetime_usec; |
| if (route->mtu == 0) |
| route->mtu = mtu; |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request gateway: %m"); |
| } |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) { |
| uint32_t lifetime_valid_sec, lifetime_preferred_sec; |
| usec_t lifetime_valid_usec, lifetime_preferred_usec, timestamp_usec; |
| _cleanup_set_free_ Set *addresses = NULL; |
| struct in6_addr prefix, *a; |
| unsigned prefixlen; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| if (!link->network->ipv6_accept_ra_use_autonomous_prefix) |
| return 0; |
| |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_prefix_get_address(rt, &prefix); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix address: %m"); |
| |
| r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix length: %m"); |
| |
| /* ndisc_generate_addresses() below requires the prefix length <= 64. */ |
| if (prefixlen > 64) { |
| log_link_debug(link, "Prefix is longer than 64, ignoring autonomous prefix %s.", |
| IN6_ADDR_PREFIX_TO_STRING(&prefix, prefixlen)); |
| return 0; |
| } |
| |
| r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime_valid_sec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix valid lifetime: %m"); |
| |
| r = sd_ndisc_router_prefix_get_preferred_lifetime(rt, &lifetime_preferred_sec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix preferred lifetime: %m"); |
| |
| /* The preferred lifetime is never greater than the valid lifetime */ |
| if (lifetime_preferred_sec > lifetime_valid_sec) |
| return 0; |
| |
| lifetime_valid_usec = sec_to_usec(lifetime_valid_sec, timestamp_usec); |
| lifetime_preferred_usec = sec_to_usec(lifetime_preferred_sec, timestamp_usec); |
| |
| r = ndisc_generate_addresses(link, &prefix, prefixlen, &addresses); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to generate SLAAC addresses: %m"); |
| |
| SET_FOREACH(a, addresses) { |
| _cleanup_(address_freep) Address *address = NULL; |
| |
| r = address_new(&address); |
| if (r < 0) |
| return log_oom(); |
| |
| address->family = AF_INET6; |
| address->in_addr.in6 = *a; |
| address->prefixlen = prefixlen; |
| address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR; |
| address->lifetime_valid_usec = lifetime_valid_usec; |
| address->lifetime_preferred_usec = lifetime_preferred_usec; |
| |
| r = ndisc_request_address(TAKE_PTR(address), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request SLAAC address: %m"); |
| } |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_onlink_prefix(Link *link, sd_ndisc_router *rt) { |
| _cleanup_(route_freep) Route *route = NULL; |
| usec_t timestamp_usec; |
| uint32_t lifetime_sec; |
| struct in6_addr prefix; |
| unsigned prefixlen; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| if (!link->network->ipv6_accept_ra_use_onlink_prefix) |
| return 0; |
| |
| r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime_sec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix lifetime: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_prefix_get_address(rt, &prefix); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix address: %m"); |
| |
| r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix length: %m"); |
| |
| r = route_new(&route); |
| if (r < 0) |
| return log_oom(); |
| |
| route->family = AF_INET6; |
| route->dst.in6 = prefix; |
| route->dst_prefixlen = prefixlen; |
| route->lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request prefix route: %m"); |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_prefix(Link *link, sd_ndisc_router *rt) { |
| unsigned prefixlen; |
| struct in6_addr a; |
| uint8_t flags; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| r = sd_ndisc_router_prefix_get_address(rt, &a); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix address: %m"); |
| |
| /* RFC 4861 Section 4.6.2: |
| * A router SHOULD NOT send a prefix option for the link-local prefix and a host SHOULD ignore such |
| * a prefix option. */ |
| if (in6_addr_is_link_local(&a)) { |
| log_link_debug(link, "Received link-local prefix, ignoring autonomous prefix."); |
| return 0; |
| } |
| |
| r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix length: %m"); |
| |
| if (in6_prefix_is_filtered(&a, prefixlen, link->network->ndisc_allow_listed_prefix, link->network->ndisc_deny_listed_prefix)) { |
| if (DEBUG_LOGGING) |
| log_link_debug(link, "Prefix '%s' is %s, ignoring", |
| !set_isempty(link->network->ndisc_allow_listed_prefix) ? "not in allow list" |
| : "in deny list", |
| IN6_ADDR_PREFIX_TO_STRING(&a, prefixlen)); |
| return 0; |
| } |
| |
| r = sd_ndisc_router_prefix_get_flags(rt, &flags); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA prefix flags: %m"); |
| |
| if (FLAGS_SET(flags, ND_OPT_PI_FLAG_ONLINK)) { |
| r = ndisc_router_process_onlink_prefix(link, rt); |
| if (r < 0) |
| return r; |
| } |
| |
| if (FLAGS_SET(flags, ND_OPT_PI_FLAG_AUTO)) { |
| r = ndisc_router_process_autonomous_prefix(link, rt); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) { |
| _cleanup_(route_freep) Route *route = NULL; |
| unsigned preference, prefixlen; |
| struct in6_addr gateway, dst; |
| uint32_t lifetime_sec; |
| usec_t timestamp_usec; |
| int r; |
| |
| assert(link); |
| |
| if (!link->network->ipv6_accept_ra_use_route_prefix) |
| return 0; |
| |
| r = sd_ndisc_router_route_get_lifetime(rt, &lifetime_sec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get route lifetime from RA: %m"); |
| |
| r = sd_ndisc_router_route_get_address(rt, &dst); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get route destination address: %m"); |
| |
| r = sd_ndisc_router_route_get_prefixlen(rt, &prefixlen); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get route prefix length: %m"); |
| |
| if (in6_addr_is_null(&dst) && prefixlen == 0) { |
| log_link_debug(link, "Route prefix is ::/0, ignoring"); |
| return 0; |
| } |
| |
| if (in6_prefix_is_filtered(&dst, prefixlen, |
| link->network->ndisc_allow_listed_route_prefix, |
| link->network->ndisc_deny_listed_route_prefix)) { |
| |
| if (DEBUG_LOGGING) |
| log_link_debug(link, "Route prefix %s is %s, ignoring", |
| !set_isempty(link->network->ndisc_allow_listed_route_prefix) ? "not in allow list" |
| : "in deny list", |
| IN6_ADDR_PREFIX_TO_STRING(&dst, prefixlen)); |
| return 0; |
| } |
| |
| r = sd_ndisc_router_get_address(rt, &gateway); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m"); |
| |
| if (link_get_ipv6_address(link, &gateway, 0, NULL) >= 0) { |
| if (DEBUG_LOGGING) |
| log_link_debug(link, "Advertised route gateway %s is local to the link, ignoring route", |
| IN6_ADDR_TO_STRING(&gateway)); |
| return 0; |
| } |
| |
| r = sd_ndisc_router_route_get_preference(rt, &preference); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get default router preference from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = route_new(&route); |
| if (r < 0) |
| return log_oom(); |
| |
| route->family = AF_INET6; |
| route->pref = preference; |
| route->gw.in6 = gateway; |
| route->gw_family = AF_INET6; |
| route->dst.in6 = dst; |
| route->dst_prefixlen = prefixlen; |
| route->lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request additional route: %m"); |
| |
| return 0; |
| } |
| |
| static void ndisc_rdnss_hash_func(const NDiscRDNSS *x, struct siphash *state) { |
| siphash24_compress(&x->address, sizeof(x->address), state); |
| } |
| |
| static int ndisc_rdnss_compare_func(const NDiscRDNSS *a, const NDiscRDNSS *b) { |
| return memcmp(&a->address, &b->address, sizeof(a->address)); |
| } |
| |
| DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
| ndisc_rdnss_hash_ops, |
| NDiscRDNSS, |
| ndisc_rdnss_hash_func, |
| ndisc_rdnss_compare_func, |
| free); |
| |
| static int ndisc_router_process_rdnss(Link *link, sd_ndisc_router *rt) { |
| usec_t lifetime_usec, timestamp_usec; |
| uint32_t lifetime_sec; |
| const struct in6_addr *a; |
| struct in6_addr router; |
| bool updated = false, logged_about_too_many = false; |
| int n, r; |
| |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| if (!link->network->ipv6_accept_ra_use_dns) |
| return 0; |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_rdnss_get_lifetime(rt, &lifetime_sec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RDNSS lifetime: %m"); |
| |
| lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
| |
| n = sd_ndisc_router_rdnss_get_addresses(rt, &a); |
| if (n < 0) |
| return log_link_error_errno(link, n, "Failed to get RDNSS addresses: %m"); |
| |
| for (int j = 0; j < n; j++) { |
| _cleanup_free_ NDiscRDNSS *x = NULL; |
| NDiscRDNSS *rdnss, d = { |
| .address = a[j], |
| }; |
| |
| if (lifetime_usec == 0) { |
| /* The entry is outdated. */ |
| free(set_remove(link->ndisc_rdnss, &d)); |
| updated = true; |
| continue; |
| } |
| |
| rdnss = set_get(link->ndisc_rdnss, &d); |
| if (rdnss) { |
| rdnss->router = router; |
| rdnss->lifetime_usec = lifetime_usec; |
| continue; |
| } |
| |
| if (set_size(link->ndisc_rdnss) >= NDISC_RDNSS_MAX) { |
| if (!logged_about_too_many) |
| log_link_warning(link, "Too many RDNSS records per link. Only first %u records will be used.", NDISC_RDNSS_MAX); |
| logged_about_too_many = true; |
| continue; |
| } |
| |
| x = new(NDiscRDNSS, 1); |
| if (!x) |
| return log_oom(); |
| |
| *x = (NDiscRDNSS) { |
| .address = a[j], |
| .router = router, |
| .lifetime_usec = lifetime_usec, |
| }; |
| |
| r = set_ensure_consume(&link->ndisc_rdnss, &ndisc_rdnss_hash_ops, TAKE_PTR(x)); |
| if (r < 0) |
| return log_oom(); |
| assert(r > 0); |
| |
| updated = true; |
| } |
| |
| if (updated) |
| link_dirty(link); |
| |
| return 0; |
| } |
| |
| static void ndisc_dnssl_hash_func(const NDiscDNSSL *x, struct siphash *state) { |
| siphash24_compress_string(NDISC_DNSSL_DOMAIN(x), state); |
| } |
| |
| static int ndisc_dnssl_compare_func(const NDiscDNSSL *a, const NDiscDNSSL *b) { |
| return strcmp(NDISC_DNSSL_DOMAIN(a), NDISC_DNSSL_DOMAIN(b)); |
| } |
| |
| DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
| ndisc_dnssl_hash_ops, |
| NDiscDNSSL, |
| ndisc_dnssl_hash_func, |
| ndisc_dnssl_compare_func, |
| free); |
| |
| static int ndisc_router_process_dnssl(Link *link, sd_ndisc_router *rt) { |
| _cleanup_strv_free_ char **l = NULL; |
| usec_t lifetime_usec, timestamp_usec; |
| struct in6_addr router; |
| uint32_t lifetime_sec; |
| bool updated = false, logged_about_too_many = false; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_NO) |
| return 0; |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_dnssl_get_lifetime(rt, &lifetime_sec); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get DNSSL lifetime: %m"); |
| |
| lifetime_usec = sec_to_usec(lifetime_sec, timestamp_usec); |
| |
| r = sd_ndisc_router_dnssl_get_domains(rt, &l); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get DNSSL addresses: %m"); |
| |
| STRV_FOREACH(j, l) { |
| _cleanup_free_ NDiscDNSSL *s = NULL; |
| NDiscDNSSL *dnssl; |
| |
| s = malloc0(ALIGN(sizeof(NDiscDNSSL)) + strlen(*j) + 1); |
| if (!s) |
| return log_oom(); |
| |
| strcpy(NDISC_DNSSL_DOMAIN(s), *j); |
| |
| if (lifetime_usec == 0) { |
| /* The entry is outdated. */ |
| free(set_remove(link->ndisc_dnssl, s)); |
| updated = true; |
| continue; |
| } |
| |
| dnssl = set_get(link->ndisc_dnssl, s); |
| if (dnssl) { |
| dnssl->router = router; |
| dnssl->lifetime_usec = lifetime_usec; |
| continue; |
| } |
| |
| if (set_size(link->ndisc_dnssl) >= NDISC_DNSSL_MAX) { |
| if (!logged_about_too_many) |
| log_link_warning(link, "Too many DNSSL records per link. Only first %u records will be used.", NDISC_DNSSL_MAX); |
| logged_about_too_many = true; |
| continue; |
| } |
| |
| s->router = router; |
| s->lifetime_usec = lifetime_usec; |
| |
| r = set_ensure_consume(&link->ndisc_dnssl, &ndisc_dnssl_hash_ops, TAKE_PTR(s)); |
| if (r < 0) |
| return log_oom(); |
| assert(r > 0); |
| |
| updated = true; |
| } |
| |
| if (updated) |
| link_dirty(link); |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) { |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| for (r = sd_ndisc_router_option_rewind(rt); ; r = sd_ndisc_router_option_next(rt)) { |
| uint8_t type; |
| |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to iterate through options: %m"); |
| if (r == 0) /* EOF */ |
| return 0; |
| |
| r = sd_ndisc_router_option_get_type(rt, &type); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA option type: %m"); |
| |
| switch (type) { |
| case SD_NDISC_OPTION_PREFIX_INFORMATION: |
| r = ndisc_router_process_prefix(link, rt); |
| break; |
| |
| case SD_NDISC_OPTION_ROUTE_INFORMATION: |
| r = ndisc_router_process_route(link, rt); |
| break; |
| |
| case SD_NDISC_OPTION_RDNSS: |
| r = ndisc_router_process_rdnss(link, rt); |
| break; |
| |
| case SD_NDISC_OPTION_DNSSL: |
| r = ndisc_router_process_dnssl(link, rt); |
| break; |
| } |
| if (r < 0 && r != -EBADMSG) |
| return r; |
| } |
| } |
| |
| static int ndisc_drop_outdated(Link *link, usec_t timestamp_usec) { |
| bool updated = false; |
| NDiscDNSSL *dnssl; |
| NDiscRDNSS *rdnss; |
| Address *address; |
| Route *route; |
| int r = 0, k; |
| |
| assert(link); |
| |
| /* If an address or friends is already assigned, but not valid anymore, then refuse to update it, |
| * and let's immediately remove it. |
| * See RFC4862, section 5.5.3.e. But the following logic is deviated from RFC4862 by honoring all |
| * valid lifetimes to improve the reaction of SLAAC to renumbering events. |
| * See draft-ietf-6man-slaac-renum-02, section 4.2. */ |
| |
| SET_FOREACH(route, link->routes) { |
| if (route->source != NETWORK_CONFIG_SOURCE_NDISC) |
| continue; |
| |
| if (route->lifetime_usec >= timestamp_usec) |
| continue; /* the route is still valid */ |
| |
| k = route_remove_and_drop(route); |
| if (k < 0) |
| r = log_link_warning_errno(link, k, "Failed to remove outdated SLAAC route, ignoring: %m"); |
| } |
| |
| SET_FOREACH(address, link->addresses) { |
| if (address->source != NETWORK_CONFIG_SOURCE_NDISC) |
| continue; |
| |
| if (address->lifetime_valid_usec >= timestamp_usec) |
| continue; /* the address is still valid */ |
| |
| k = address_remove_and_drop(address); |
| if (k < 0) |
| r = log_link_warning_errno(link, k, "Failed to remove outdated SLAAC address, ignoring: %m"); |
| } |
| |
| SET_FOREACH(rdnss, link->ndisc_rdnss) { |
| if (rdnss->lifetime_usec >= timestamp_usec) |
| continue; /* the DNS server is still valid */ |
| |
| free(set_remove(link->ndisc_rdnss, rdnss)); |
| updated = true; |
| } |
| |
| SET_FOREACH(dnssl, link->ndisc_dnssl) { |
| if (dnssl->lifetime_usec >= timestamp_usec) |
| continue; /* the DNS domain is still valid */ |
| |
| free(set_remove(link->ndisc_dnssl, dnssl)); |
| updated = true; |
| } |
| |
| if (updated) |
| link_dirty(link); |
| |
| return r; |
| } |
| |
| static int ndisc_setup_expire(Link *link); |
| |
| static int ndisc_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) { |
| Link *link = ASSERT_PTR(userdata); |
| usec_t now_usec; |
| |
| assert(link->manager); |
| |
| assert_se(sd_event_now(link->manager->event, CLOCK_BOOTTIME, &now_usec) >= 0); |
| |
| (void) ndisc_drop_outdated(link, now_usec); |
| (void) ndisc_setup_expire(link); |
| return 0; |
| } |
| |
| static int ndisc_setup_expire(Link *link) { |
| usec_t lifetime_usec = USEC_INFINITY; |
| NDiscDNSSL *dnssl; |
| NDiscRDNSS *rdnss; |
| Address *address; |
| Route *route; |
| int r; |
| |
| assert(link); |
| assert(link->manager); |
| |
| SET_FOREACH(route, link->routes) { |
| if (route->source != NETWORK_CONFIG_SOURCE_NDISC) |
| continue; |
| |
| if (!route_exists(route)) |
| continue; |
| |
| lifetime_usec = MIN(lifetime_usec, route->lifetime_usec); |
| } |
| |
| SET_FOREACH(address, link->addresses) { |
| if (address->source != NETWORK_CONFIG_SOURCE_NDISC) |
| continue; |
| |
| if (!address_exists(address)) |
| continue; |
| |
| lifetime_usec = MIN(lifetime_usec, address->lifetime_valid_usec); |
| } |
| |
| SET_FOREACH(rdnss, link->ndisc_rdnss) |
| lifetime_usec = MIN(lifetime_usec, rdnss->lifetime_usec); |
| |
| SET_FOREACH(dnssl, link->ndisc_dnssl) |
| lifetime_usec = MIN(lifetime_usec, dnssl->lifetime_usec); |
| |
| if (lifetime_usec == USEC_INFINITY) |
| return 0; |
| |
| r = event_reset_time(link->manager->event, &link->ndisc_expire, CLOCK_BOOTTIME, |
| lifetime_usec, 0, ndisc_expire_handler, link, 0, "ndisc-expiration", true); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Failed to update expiration timer for ndisc: %m"); |
| |
| return 0; |
| } |
| |
| static int ndisc_start_dhcp6_client(Link *link, sd_ndisc_router *rt) { |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| switch (link->network->ipv6_accept_ra_start_dhcp6_client) { |
| case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO: |
| return 0; |
| |
| case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES: { |
| uint64_t flags; |
| |
| r = sd_ndisc_router_get_flags(rt, &flags); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Failed to get RA flags: %m"); |
| |
| if ((flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) == 0) |
| return 0; |
| |
| /* (re)start DHCPv6 client in stateful or stateless mode according to RA flags. |
| * Note, if both "managed" and "other configuration" bits are set, then ignore |
| * "other configuration" bit. See RFC 4861. */ |
| r = dhcp6_start_on_ra(link, !(flags & ND_RA_FLAG_MANAGED)); |
| break; |
| } |
| case IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS: |
| /* When IPv6AcceptRA.DHCPv6Client=always, start dhcp6 client in solicit mode |
| * even if the router flags have neither M nor O flags. */ |
| r = dhcp6_start_on_ra(link, /* information_request = */ false); |
| break; |
| |
| default: |
| assert_not_reached(); |
| } |
| |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not acquire DHCPv6 lease on NDisc request: %m"); |
| |
| log_link_debug(link, "Acquiring DHCPv6 lease on NDisc request"); |
| return 0; |
| } |
| |
| static int ndisc_router_handler(Link *link, sd_ndisc_router *rt) { |
| struct in6_addr router; |
| usec_t timestamp_usec; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->manager); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r == -ENODATA) { |
| log_link_debug(link, "Received RA without router address, ignoring."); |
| return 0; |
| } |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| if (in6_prefix_is_filtered(&router, 128, link->network->ndisc_allow_listed_router, link->network->ndisc_deny_listed_router)) { |
| if (DEBUG_LOGGING) { |
| if (!set_isempty(link->network->ndisc_allow_listed_router)) |
| log_link_debug(link, "Router %s is not in allow list, ignoring.", IN6_ADDR_TO_STRING(&router)); |
| else |
| log_link_debug(link, "Router %s is in deny list, ignoring.", IN6_ADDR_TO_STRING(&router)); |
| } |
| return 0; |
| } |
| |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r == -ENODATA) { |
| log_link_debug(link, "Received RA without timestamp, ignoring."); |
| return 0; |
| } |
| if (r < 0) |
| return r; |
| |
| r = ndisc_drop_outdated(link, timestamp_usec); |
| if (r < 0) |
| return r; |
| |
| r = ndisc_start_dhcp6_client(link, rt); |
| if (r < 0) |
| return r; |
| |
| r = ndisc_router_process_default(link, rt); |
| if (r < 0) |
| return r; |
| |
| r = ndisc_router_process_options(link, rt); |
| if (r < 0) |
| return r; |
| |
| r = ndisc_setup_expire(link); |
| if (r < 0) |
| return r; |
| |
| if (link->ndisc_messages == 0) |
| link->ndisc_configured = true; |
| else |
| log_link_debug(link, "Setting SLAAC addresses and router."); |
| |
| if (!link->ndisc_configured) |
| link_set_state(link, LINK_STATE_CONFIGURING); |
| |
| link_check_ready(link); |
| return 0; |
| } |
| |
| static void ndisc_handler(sd_ndisc *nd, sd_ndisc_event_t event, sd_ndisc_router *rt, void *userdata) { |
| Link *link = ASSERT_PTR(userdata); |
| int r; |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return; |
| |
| switch (event) { |
| |
| case SD_NDISC_EVENT_ROUTER: |
| r = ndisc_router_handler(link, rt); |
| if (r < 0 && r != -EBADMSG) { |
| link_enter_failed(link); |
| return; |
| } |
| break; |
| |
| case SD_NDISC_EVENT_TIMEOUT: |
| log_link_debug(link, "NDisc handler get timeout event"); |
| if (link->ndisc_messages == 0) { |
| link->ndisc_configured = true; |
| link_check_ready(link); |
| } |
| break; |
| default: |
| assert_not_reached(); |
| } |
| } |
| |
| static int ndisc_configure(Link *link) { |
| int r; |
| |
| assert(link); |
| |
| if (!link_ipv6_accept_ra_enabled(link)) |
| return 0; |
| |
| if (link->ndisc) |
| return -EBUSY; /* Already configured. */ |
| |
| r = sd_ndisc_new(&link->ndisc); |
| if (r < 0) |
| return r; |
| |
| r = sd_ndisc_attach_event(link->ndisc, link->manager->event, 0); |
| if (r < 0) |
| return r; |
| |
| if (link->hw_addr.length == ETH_ALEN) { |
| r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether); |
| if (r < 0) |
| return r; |
| } |
| |
| r = sd_ndisc_set_ifindex(link->ndisc, link->ifindex); |
| if (r < 0) |
| return r; |
| |
| r = sd_ndisc_set_callback(link->ndisc, ndisc_handler, link); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int ndisc_start(Link *link) { |
| int r; |
| |
| assert(link); |
| |
| if (!link->ndisc || !link->dhcp6_client) |
| return 0; |
| |
| if (!link_has_carrier(link)) |
| return 0; |
| |
| if (in6_addr_is_null(&link->ipv6ll_address)) |
| return 0; |
| |
| log_link_debug(link, "Discovering IPv6 routers"); |
| |
| r = sd_ndisc_start(link->ndisc); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int ndisc_process_request(Request *req, Link *link, void *userdata) { |
| int r; |
| |
| assert(link); |
| |
| if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false)) |
| return 0; |
| |
| r = ndisc_configure(link); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Failed to configure IPv6 Router Discovery: %m"); |
| |
| r = ndisc_start(link); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m"); |
| |
| log_link_debug(link, "IPv6 Router Discovery is configured%s.", |
| r > 0 ? " and started" : ""); |
| return 1; |
| } |
| |
| int link_request_ndisc(Link *link) { |
| int r; |
| |
| assert(link); |
| |
| if (!link_ipv6_accept_ra_enabled(link)) |
| return 0; |
| |
| if (link->ndisc) |
| return 0; |
| |
| r = link_queue_request(link, REQUEST_TYPE_NDISC, ndisc_process_request, NULL); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Failed to request configuring of the IPv6 Router Discovery: %m"); |
| |
| log_link_debug(link, "Requested configuring of the IPv6 Router Discovery."); |
| return 0; |
| } |
| |
| int ndisc_stop(Link *link) { |
| assert(link); |
| |
| link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire); |
| |
| return sd_ndisc_stop(link->ndisc); |
| } |
| |
| |
| void ndisc_flush(Link *link) { |
| assert(link); |
| |
| /* Removes all RDNSS and DNSSL entries, without exception */ |
| |
| link->ndisc_rdnss = set_free(link->ndisc_rdnss); |
| link->ndisc_dnssl = set_free(link->ndisc_dnssl); |
| } |
| |
| static const char* const ipv6_accept_ra_start_dhcp6_client_table[_IPV6_ACCEPT_RA_START_DHCP6_CLIENT_MAX] = { |
| [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO] = "no", |
| [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS] = "always", |
| [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES] = "yes", |
| }; |
| |
| DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES); |
| |
| DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_use_domains, dhcp_use_domains, DHCPUseDomains, |
| "Failed to parse UseDomains= setting"); |
| DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_start_dhcp6_client, ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, |
| "Failed to parse DHCPv6Client= setting"); |
