diff options
Diffstat (limited to 'src/network/networkd-ndisc.c')
| -rw-r--r-- | src/network/networkd-ndisc.c | 1531 |
1 files changed, 1531 insertions, 0 deletions
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c new file mode 100644 index 0000000..840ccb1 --- /dev/null +++ b/src/network/networkd-ndisc.c @@ -0,0 +1,1531 @@ +/* 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" +#include "sysctl-util.h" + +#define NDISC_DNSSL_MAX 64U +#define NDISC_RDNSS_MAX 64U +/* Not defined in the RFC, but let's set an upper limit to make not consume much memory. + * This should be safe as typically there should be at most 1 portal per network. */ +#define NDISC_CAPTIVE_PORTAL_MAX 64U +/* Neither defined in the RFC. Just for safety. Otherwise, malformed messages can make clients trigger OOM. + * Not sure if the threshold is high enough. Let's adjust later if not. */ +#define NDISC_PREF64_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; + uint8_t hop_limit = 0; + uint32_t mtu = 0; + 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; + + if (link->network->ipv6_accept_ra_use_mtu) { + r = sd_ndisc_router_get_mtu(rt, &mtu); + if (r < 0 && r != -ENODATA) + return log_link_warning_errno(link, r, "Failed to get default router MTU from RA: %m"); + } + + if (link->network->ipv6_accept_ra_use_hop_limit) { + r = sd_ndisc_router_get_hop_limit(rt, &hop_limit); + if (r < 0 && r != -ENODATA) + return log_link_warning_errno(link, r, "Failed to get default router hop limit from RA: %m"); + } + + 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; + if (route->mtu == 0) + route->mtu = mtu; + if (route->hop_limit == 0) + route->hop_limit = hop_limit; + + 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, address, &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; + struct in6_addr gateway; + unsigned preference; + 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_timestamp(rt, CLOCK_BOOTTIME, &lifetime_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get gateway lifetime from RA: %m"); + + r = sd_ndisc_router_get_address(rt, &gateway); + if (r < 0) + return log_link_warning_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_warning_errno(link, r, "Failed to get default router preference 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; + + r = ndisc_request_route(TAKE_PTR(route), link, rt); + if (r < 0) + return log_link_warning_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; + + r = ndisc_request_route(TAKE_PTR(route), link, rt); + if (r < 0) + return log_link_warning_errno(link, r, "Could not request gateway: %m"); + } + + return 0; +} + +static int ndisc_router_process_icmp6_ratelimit(Link *link, sd_ndisc_router *rt) { + usec_t icmp6_ratelimit, msec; + int r; + + assert(link); + assert(link->network); + assert(rt); + + if (!link->network->ipv6_accept_ra_use_icmp6_ratelimit) + return 0; + + r = sd_ndisc_router_get_icmp6_ratelimit(rt, &icmp6_ratelimit); + if (r < 0) { + log_link_debug(link, "Failed to get ICMP6 ratelimit from RA, ignoring: %m"); + return 0; + } + + /* We do not allow 0 here. */ + if (!timestamp_is_set(icmp6_ratelimit)) + return 0; + + msec = DIV_ROUND_UP(icmp6_ratelimit, USEC_PER_MSEC); + if (msec <= 0 || msec > INT_MAX) + return 0; + + /* Limit the maximal rates for sending ICMPv6 packets. 0 to disable any limiting, otherwise the + * minimal space between responses in milliseconds. Default: 1000. */ + r = sysctl_write_ip_property_int(AF_INET6, NULL, "icmp/ratelimit", (int) msec); + if (r < 0) + log_link_warning_errno(link, r, "Failed to apply ICMP6 ratelimit, ignoring: %m"); + + return 0; +} + +static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) { + usec_t lifetime_valid_usec, lifetime_preferred_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_prefix_get_address(rt, &prefix); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get prefix address: %m"); + + r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); + if (r < 0) + return log_link_warning_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_timestamp(rt, CLOCK_BOOTTIME, &lifetime_valid_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get prefix valid lifetime: %m"); + + r = sd_ndisc_router_prefix_get_preferred_lifetime_timestamp(rt, CLOCK_BOOTTIME, &lifetime_preferred_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get prefix preferred lifetime: %m"); + + /* The preferred lifetime is never greater than the valid lifetime */ + if (lifetime_preferred_usec > lifetime_valid_usec) + return 0; + + r = ndisc_generate_addresses(link, &prefix, prefixlen, &addresses); + if (r < 0) + return log_link_warning_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_warning_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; + unsigned prefixlen, preference; + usec_t lifetime_usec; + struct in6_addr prefix; + 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_timestamp(rt, CLOCK_BOOTTIME, &lifetime_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get prefix lifetime: %m"); + + r = sd_ndisc_router_prefix_get_address(rt, &prefix); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get prefix address: %m"); + + r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get prefix length: %m"); + + /* Prefix Information option does not have preference, hence we use the 'main' preference here */ + r = sd_ndisc_router_get_preference(rt, &preference); + if (r < 0) + log_link_warning_errno(link, r, "Failed to get default router preference from RA: %m"); + + r = route_new(&route); + if (r < 0) + return log_oom(); + + route->family = AF_INET6; + route->dst.in6 = prefix; + route->dst_prefixlen = prefixlen; + route->pref = preference; + route->lifetime_usec = lifetime_usec; + + r = ndisc_request_route(TAKE_PTR(route), link, rt); + if (r < 0) + return log_link_warning_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_warning_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_warning_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_warning_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; + usec_t lifetime_usec; + int r; + + assert(link); + + if (!link->network->ipv6_accept_ra_use_route_prefix) + return 0; + + r = sd_ndisc_router_route_get_lifetime_timestamp(rt, CLOCK_BOOTTIME, &lifetime_usec); + if (r < 0) + return log_link_warning_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_warning_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_warning_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_warning_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 == -ENOTSUP) { + log_link_debug_errno(link, r, "Received route prefix with unsupported preference, ignoring: %m"); + return 0; + } + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get default router preference from RA: %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 = lifetime_usec; + + r = ndisc_request_route(TAKE_PTR(route), link, rt); + if (r < 0) + return log_link_warning_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; + 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_warning_errno(link, r, "Failed to get router address from RA: %m"); + + r = sd_ndisc_router_rdnss_get_lifetime_timestamp(rt, CLOCK_BOOTTIME, &lifetime_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get RDNSS lifetime: %m"); + + n = sd_ndisc_router_rdnss_get_addresses(rt, &a); + if (n < 0) + return log_link_warning_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; + struct in6_addr router; + 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_warning_errno(link, r, "Failed to get router address from RA: %m"); + + r = sd_ndisc_router_dnssl_get_lifetime_timestamp(rt, CLOCK_BOOTTIME, &lifetime_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get DNSSL lifetime: %m"); + + r = sd_ndisc_router_dnssl_get_domains(rt, &l); + if (r < 0) + return log_link_warning_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 NDiscCaptivePortal* ndisc_captive_portal_free(NDiscCaptivePortal *x) { + if (!x) + return NULL; + + free(x->captive_portal); + return mfree(x); +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(NDiscCaptivePortal*, ndisc_captive_portal_free); + +static void ndisc_captive_portal_hash_func(const NDiscCaptivePortal *x, struct siphash *state) { + assert(x); + siphash24_compress_string(x->captive_portal, state); +} + +static int ndisc_captive_portal_compare_func(const NDiscCaptivePortal *a, const NDiscCaptivePortal *b) { + assert(a); + assert(b); + return strcmp_ptr(a->captive_portal, b->captive_portal); +} + +DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( + ndisc_captive_portal_hash_ops, + NDiscCaptivePortal, + ndisc_captive_portal_hash_func, + ndisc_captive_portal_compare_func, + ndisc_captive_portal_free); + +static int ndisc_router_process_captive_portal(Link *link, sd_ndisc_router *rt) { + _cleanup_(ndisc_captive_portal_freep) NDiscCaptivePortal *new_entry = NULL; + _cleanup_free_ char *captive_portal = NULL; + usec_t lifetime_usec; + NDiscCaptivePortal *exist; + struct in6_addr router; + const char *uri; + size_t len; + int r; + + assert(link); + assert(link->network); + assert(rt); + + if (!link->network->ipv6_accept_ra_use_captive_portal) + return 0; + + r = sd_ndisc_router_get_address(rt, &router); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get router address from RA: %m"); + + /* RFC 4861 section 4.2. states that the lifetime in the message header should be used only for the + * default gateway, but the captive portal option does not have a lifetime field, hence, we use the + * main lifetime for the portal. */ + r = sd_ndisc_router_get_lifetime_timestamp(rt, CLOCK_BOOTTIME, &lifetime_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get lifetime of RA message: %m"); + + r = sd_ndisc_router_captive_portal_get_uri(rt, &uri, &len); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get captive portal from RA: %m"); + + if (len == 0) + return log_link_warning_errno(link, SYNTHETIC_ERRNO(EBADMSG), "Received empty captive portal, ignoring."); + + r = make_cstring(uri, len, MAKE_CSTRING_REFUSE_TRAILING_NUL, &captive_portal); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to convert captive portal URI: %m"); + + if (!in_charset(captive_portal, URI_VALID)) + return log_link_warning_errno(link, SYNTHETIC_ERRNO(EBADMSG), "Received invalid captive portal, ignoring."); + + if (lifetime_usec == 0) { + /* Drop the portal with zero lifetime. */ + ndisc_captive_portal_free(set_remove(link->ndisc_captive_portals, + &(NDiscCaptivePortal) { + .captive_portal = captive_portal, + })); + return 0; + } + + exist = set_get(link->ndisc_captive_portals, + &(NDiscCaptivePortal) { + .captive_portal = captive_portal, + }); + if (exist) { + /* update existing entry */ + exist->router = router; + exist->lifetime_usec = lifetime_usec; + return 1; + } + + if (set_size(link->ndisc_captive_portals) >= NDISC_CAPTIVE_PORTAL_MAX) { + NDiscCaptivePortal *c, *target = NULL; + + /* Find the portal who has the minimal lifetime and drop it to store new one. */ + SET_FOREACH(c, link->ndisc_captive_portals) + if (!target || c->lifetime_usec < target->lifetime_usec) + target = c; + + assert(target); + assert(set_remove(link->ndisc_captive_portals, target) == target); + ndisc_captive_portal_free(target); + } + + new_entry = new(NDiscCaptivePortal, 1); + if (!new_entry) + return log_oom(); + + *new_entry = (NDiscCaptivePortal) { + .router = router, + .lifetime_usec = lifetime_usec, + .captive_portal = TAKE_PTR(captive_portal), + }; + + r = set_ensure_put(&link->ndisc_captive_portals, &ndisc_captive_portal_hash_ops, new_entry); + if (r < 0) + return log_oom(); + assert(r > 0); + TAKE_PTR(new_entry); + + link_dirty(link); + return 1; +} + +static void ndisc_pref64_hash_func(const NDiscPREF64 *x, struct siphash *state) { + assert(x); + + siphash24_compress(&x->prefix_len, sizeof(x->prefix_len), state); + siphash24_compress(&x->prefix, sizeof(x->prefix), state); +} + +static int ndisc_pref64_compare_func(const NDiscPREF64 *a, const NDiscPREF64 *b) { + int r; + + assert(a); + assert(b); + + r = CMP(a->prefix_len, b->prefix_len); + if (r != 0) + return r; + + return memcmp(&a->prefix, &b->prefix, sizeof(a->prefix)); +} + +DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( + ndisc_pref64_hash_ops, + NDiscPREF64, + ndisc_pref64_hash_func, + ndisc_pref64_compare_func, + mfree); + +static int ndisc_router_process_pref64(Link *link, sd_ndisc_router *rt) { + _cleanup_free_ NDiscPREF64 *new_entry = NULL; + usec_t lifetime_usec; + struct in6_addr a, router; + unsigned prefix_len; + NDiscPREF64 *exist; + int r; + + assert(link); + assert(link->network); + assert(rt); + + if (!link->network->ipv6_accept_ra_use_pref64) + return 0; + + r = sd_ndisc_router_get_address(rt, &router); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get router address from RA: %m"); + + r = sd_ndisc_router_prefix64_get_prefix(rt, &a); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get pref64 prefix: %m"); + + r = sd_ndisc_router_prefix64_get_prefixlen(rt, &prefix_len); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get pref64 prefix length: %m"); + + r = sd_ndisc_router_prefix64_get_lifetime_timestamp(rt, CLOCK_BOOTTIME, &lifetime_usec); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to get pref64 prefix lifetime: %m"); + + if (lifetime_usec == 0) { + free(set_remove(link->ndisc_pref64, + &(NDiscPREF64) { + .prefix = a, + .prefix_len = prefix_len + })); + return 0; + } + + exist = set_get(link->ndisc_pref64, + &(NDiscPREF64) { + .prefix = a, + .prefix_len = prefix_len + }); + if (exist) { + /* update existing entry */ + exist->router = router; + exist->lifetime_usec = lifetime_usec; + return 0; + } + + if (set_size(link->ndisc_pref64) >= NDISC_PREF64_MAX) { + log_link_debug(link, "Too many PREF64 records received. Only first %u records will be used.", NDISC_PREF64_MAX); + return 0; + } + + new_entry = new(NDiscPREF64, 1); + if (!new_entry) + return log_oom(); + + *new_entry = (NDiscPREF64) { + .router = router, + .lifetime_usec = lifetime_usec, + .prefix = a, + .prefix_len = prefix_len, + }; + + r = set_ensure_put(&link->ndisc_pref64, &ndisc_pref64_hash_ops, new_entry); + if (r < 0) + return log_oom(); + + assert(r > 0); + TAKE_PTR(new_entry); + + return 0; +} + +static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) { + size_t n_captive_portal = 0; + 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_warning_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_warning_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; + case SD_NDISC_OPTION_CAPTIVE_PORTAL: + if (n_captive_portal > 0) { + if (n_captive_portal == 1) + log_link_notice(link, "Received RA with multiple captive portals, only using the first one."); + + n_captive_portal++; + continue; + } + r = ndisc_router_process_captive_portal(link, rt); + if (r > 0) + n_captive_portal++; + break; + case SD_NDISC_OPTION_PREF64: + r = ndisc_router_process_pref64(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; + NDiscCaptivePortal *cp; + NDiscPREF64 *p64; + 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; + } + + SET_FOREACH(cp, link->ndisc_captive_portals) { + if (cp->lifetime_usec >= timestamp_usec) + continue; /* the captive portal is still valid */ + + ndisc_captive_portal_free(set_remove(link->ndisc_captive_portals, cp)); + updated = true; + } + + SET_FOREACH(p64, link->ndisc_pref64) { + if (p64->lifetime_usec >= timestamp_usec) + continue; /* the pref64 prefix is still valid */ + + free(set_remove(link->ndisc_pref64, p64)); + /* The pref64 prefix is not exported through the state file, hence it is not necessary to set + * the 'updated' flag. */ + } + + 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; + NDiscCaptivePortal *cp; + NDiscDNSSL *dnssl; + NDiscRDNSS *rdnss; + NDiscPREF64 *p64; + 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); + + SET_FOREACH(cp, link->ndisc_captive_portals) + lifetime_usec = MIN(lifetime_usec, cp->lifetime_usec); + + SET_FOREACH(p64, link->ndisc_pref64) + lifetime_usec = MIN(lifetime_usec, p64->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_warning_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_warning_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_icmp6_ratelimit(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); + + /* Remove all RDNSS, DNSSL, and Captive Portal entries, without exception. */ + + link->ndisc_rdnss = set_free(link->ndisc_rdnss); + link->ndisc_dnssl = set_free(link->ndisc_dnssl); + link->ndisc_captive_portals = set_free(link->ndisc_captive_portals); + link->ndisc_pref64 = set_free(link->ndisc_pref64); +} + +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"); |