/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include "dhcp6-lease-internal.h" #include "hashmap.h" #include "in-addr-prefix-util.h" #include "networkd-address-generation.h" #include "networkd-address.h" #include "networkd-dhcp-prefix-delegation.h" #include "networkd-dhcp6.h" #include "networkd-link.h" #include "networkd-manager.h" #include "networkd-queue.h" #include "networkd-radv.h" #include "networkd-route-util.h" #include "networkd-route.h" #include "networkd-setlink.h" #include "parse-util.h" #include "string-util.h" #include "strv.h" #include "tunnel.h" bool link_dhcp_pd_is_enabled(Link *link) { assert(link); if (!link->network) return false; return link->network->dhcp_pd; } bool dhcp_pd_is_uplink(Link *link, Link *target, bool accept_auto) { assert(link); assert(target); if (!link_dhcp_pd_is_enabled(link)) return false; if (link->network->dhcp_pd_uplink_name) return streq_ptr(target->ifname, link->network->dhcp_pd_uplink_name) || strv_contains(target->alternative_names, link->network->dhcp_pd_uplink_name); if (link->network->dhcp_pd_uplink_index > 0) return target->ifindex == link->network->dhcp_pd_uplink_index; if (link->network->dhcp_pd_uplink_index == UPLINK_INDEX_SELF) return link == target; assert(link->network->dhcp_pd_uplink_index == UPLINK_INDEX_AUTO); return accept_auto; } static void link_remove_dhcp_pd_subnet_prefix(Link *link, const struct in6_addr *prefix) { void *key; assert(link); assert(link->manager); assert(prefix); if (hashmap_get(link->manager->links_by_dhcp_pd_subnet_prefix, prefix) != link) return; hashmap_remove2(link->manager->links_by_dhcp_pd_subnet_prefix, prefix, &key); free(key); } static int link_add_dhcp_pd_subnet_prefix(Link *link, const struct in6_addr *prefix) { _cleanup_free_ struct in6_addr *copy = NULL; int r; assert(link); assert(prefix); copy = newdup(struct in6_addr, prefix, 1); if (!copy) return -ENOMEM; r = hashmap_ensure_put(&link->manager->links_by_dhcp_pd_subnet_prefix, &in6_addr_hash_ops_free, copy, link); if (r < 0) return r; if (r > 0) TAKE_PTR(copy); return 0; } static int link_get_by_dhcp_pd_subnet_prefix(Manager *manager, const struct in6_addr *prefix, Link **ret) { Link *link; assert(manager); assert(prefix); link = hashmap_get(manager->links_by_dhcp_pd_subnet_prefix, prefix); if (!link) return -ENODEV; if (ret) *ret = link; return 0; } static int dhcp_pd_get_assigned_subnet_prefix(Link *link, const struct in6_addr *pd_prefix, uint8_t pd_prefix_len, struct in6_addr *ret) { assert(link); assert(link->manager); assert(pd_prefix); if (!link_dhcp_pd_is_enabled(link)) return -ENOENT; if (link->network->dhcp_pd_assign) { Address *address; SET_FOREACH(address, link->addresses) { if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD) continue; assert(address->family == AF_INET6); if (in6_addr_prefix_covers(pd_prefix, pd_prefix_len, &address->in_addr.in6) <= 0) continue; if (ret) { struct in6_addr prefix = address->in_addr.in6; in6_addr_mask(&prefix, 64); *ret = prefix; } return 0; } } else { Route *route; SET_FOREACH(route, link->manager->routes) { if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD) continue; assert(route->family == AF_INET6); if (route->nexthop.ifindex != link->ifindex) continue; if (in6_addr_prefix_covers(pd_prefix, pd_prefix_len, &route->dst.in6) > 0) { if (ret) *ret = route->dst.in6; return 0; } } } return -ENOENT; } int dhcp_pd_remove(Link *link, bool only_marked) { int ret = 0; assert(link); assert(link->manager); if (!link_dhcp_pd_is_enabled(link)) return 0; if (!only_marked) link->dhcp_pd_configured = false; if (!link->network->dhcp_pd_assign) { Route *route; SET_FOREACH(route, link->manager->routes) { if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD) continue; if (route->nexthop.ifindex != link->ifindex) continue; if (only_marked && !route_is_marked(route)) continue; if (link->radv) sd_radv_remove_prefix(link->radv, &route->dst.in6, 64); link_remove_dhcp_pd_subnet_prefix(link, &route->dst.in6); RET_GATHER(ret, route_remove_and_cancel(route, link->manager)); } } else { Address *address; SET_FOREACH(address, link->addresses) { struct in6_addr prefix; if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD) continue; if (only_marked && !address_is_marked(address)) continue; prefix = address->in_addr.in6; in6_addr_mask(&prefix, 64); if (link->radv) sd_radv_remove_prefix(link->radv, &prefix, 64); link_remove_dhcp_pd_subnet_prefix(link, &prefix); RET_GATHER(ret, address_remove_and_cancel(address, link)); } } return ret; } static int dhcp_pd_check_ready(Link *link); static int dhcp_pd_address_ready_callback(Address *address) { Address *a; assert(address); assert(address->link); SET_FOREACH(a, address->link->addresses) if (a->source == NETWORK_CONFIG_SOURCE_DHCP_PD) a->callback = NULL; return dhcp_pd_check_ready(address->link); } static int dhcp_pd_check_ready(Link *link) { int r; assert(link); assert(link->network); if (link->dhcp_pd_messages > 0) { log_link_debug(link, "%s(): DHCP-PD addresses and routes are not set.", __func__); return 0; } if (link->network->dhcp_pd_assign) { bool has_ready = false; Address *address; SET_FOREACH(address, link->addresses) { if (address->source != NETWORK_CONFIG_SOURCE_DHCP_PD) continue; if (address_is_ready(address)) { has_ready = true; break; } } if (!has_ready) { SET_FOREACH(address, link->addresses) if (address->source == NETWORK_CONFIG_SOURCE_DHCP_PD) address->callback = dhcp_pd_address_ready_callback; log_link_debug(link, "%s(): no DHCP-PD address is ready.", __func__); return 0; } } link->dhcp_pd_configured = true; log_link_debug(link, "DHCP-PD addresses and routes set."); r = dhcp_pd_remove(link, /* only_marked = */ true); if (r < 0) return r; link_check_ready(link); return 1; } static int dhcp_pd_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { int r; assert(req); assert(link); r = route_configure_handler_internal(rtnl, m, req, "Failed to add prefix route for DHCP delegated subnet prefix"); if (r <= 0) return r; r = dhcp_pd_check_ready(link); if (r < 0) link_enter_failed(link); return 1; } static int dhcp_pd_request_route(Link *link, const struct in6_addr *prefix, usec_t lifetime_usec) { _cleanup_(route_unrefp) Route *route = NULL; Route *existing; int r; assert(link); assert(link->manager); assert(link->network); assert(prefix); if (link->network->dhcp_pd_assign) return 0; r = route_new(&route); if (r < 0) return r; route->source = NETWORK_CONFIG_SOURCE_DHCP_PD; route->family = AF_INET6; route->dst.in6 = *prefix; route->dst_prefixlen = 64; route->protocol = RTPROT_DHCP; route->priority = link->network->dhcp_pd_route_metric; route->lifetime_usec = lifetime_usec; r = route_adjust_nexthops(route, link); if (r < 0) return r; if (route_get(link->manager, route, &existing) < 0) link->dhcp_pd_configured = false; else route_unmark(existing); r = link_request_route(link, route, &link->dhcp_pd_messages, dhcp_pd_route_handler); if (r < 0) return log_link_error_errno(link, r, "Failed to request DHCP-PD prefix route: %m"); return 0; } static int dhcp_pd_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 DHCP-PD address"); if (r <= 0) return r; r = dhcp_pd_check_ready(link); if (r < 0) link_enter_failed(link); return 1; } static void log_dhcp_pd_address(Link *link, const Address *address) { assert(address); assert(address->family == AF_INET6); int log_level = address_get_harder(link, address, NULL) >= 0 ? LOG_DEBUG : LOG_INFO; if (log_level < log_get_max_level()) return; log_link_full(link, log_level, "DHCP-PD address %s (valid %s, preferred %s)", IN6_ADDR_PREFIX_TO_STRING(&address->in_addr.in6, address->prefixlen), FORMAT_LIFETIME(address->lifetime_valid_usec), FORMAT_LIFETIME(address->lifetime_preferred_usec)); } static int dhcp_pd_request_address_one(Address *address, Link *link) { Address *existing; assert(address); assert(link); log_dhcp_pd_address(link, address); if (address_get(link, address, &existing) < 0) link->dhcp_pd_configured = false; else address_unmark(existing); return link_request_address(link, address, &link->dhcp_pd_messages, dhcp_pd_address_handler, NULL); } int dhcp_pd_reconfigure_address(Address *address, Link *link) { int r; assert(address); assert(address->source == NETWORK_CONFIG_SOURCE_DHCP_PD); assert(link); r = regenerate_address(address, link); if (r <= 0) return r; r = dhcp_pd_request_address_one(address, link); if (r < 0) return r; if (!link->dhcp_pd_configured) link_set_state(link, LINK_STATE_CONFIGURING); link_check_ready(link); return 0; } static int dhcp_pd_request_address( Link *link, const struct in6_addr *prefix, usec_t lifetime_preferred_usec, usec_t lifetime_valid_usec) { int r; assert(link); assert(link->network); assert(prefix); if (!link->network->dhcp_pd_assign) return 0; _cleanup_hashmap_free_ Hashmap *tokens_by_address = NULL; r = dhcp_pd_generate_addresses(link, prefix, &tokens_by_address); if (r < 0) return log_link_warning_errno(link, r, "Failed to generate addresses for acquired DHCP delegated prefix: %m"); IPv6Token *token; struct in6_addr *a; HASHMAP_FOREACH_KEY(token, a, tokens_by_address) { _cleanup_(address_unrefp) Address *address = NULL; r = address_new(&address); if (r < 0) return log_link_error_errno(link, r, "Failed to allocate address for DHCP delegated prefix: %m"); address->source = NETWORK_CONFIG_SOURCE_DHCP_PD; address->family = AF_INET6; address->in_addr.in6 = *a; address->prefixlen = 64; address->lifetime_preferred_usec = lifetime_preferred_usec; address->lifetime_valid_usec = lifetime_valid_usec; SET_FLAG(address->flags, IFA_F_MANAGETEMPADDR, link->network->dhcp_pd_manage_temporary_address); address->route_metric = link->network->dhcp_pd_route_metric; address->token = ipv6_token_ref(token); r = free_and_strdup_warn(&address->netlabel, link->network->dhcp_pd_netlabel); if (r < 0) return r; r = dhcp_pd_request_address_one(address, link); if (r < 0) return log_link_error_errno(link, r, "Failed to request DHCP delegated prefix address: %m"); } return 0; } static int dhcp_pd_calculate_subnet_prefix( const struct in6_addr *pd_prefix, uint8_t pd_prefix_len, uint64_t subnet_id, struct in6_addr *ret) { struct in6_addr prefix; assert(pd_prefix); assert(pd_prefix_len <= 64); assert(ret); if (subnet_id >= UINT64_C(1) << (64 - pd_prefix_len)) return -ERANGE; prefix = *pd_prefix; if (pd_prefix_len < 32) prefix.s6_addr32[0] |= htobe32(subnet_id >> 32); prefix.s6_addr32[1] |= htobe32(subnet_id & 0xffffffff); *ret = prefix; return 0; } static int dhcp_pd_get_preferred_subnet_prefix( Link *link, const struct in6_addr *pd_prefix, uint8_t pd_prefix_len, struct in6_addr *ret) { struct in6_addr prefix; Link *assigned_link; int r; assert(link); assert(link->manager); assert(link->network); assert(pd_prefix); if (link->network->dhcp_pd_subnet_id >= 0) { /* If the link has a preference for a particular subnet id try to allocate that */ r = dhcp_pd_calculate_subnet_prefix(pd_prefix, pd_prefix_len, link->network->dhcp_pd_subnet_id, &prefix); if (r < 0) return log_link_warning_errno(link, r, "subnet id %" PRIi64 " is out of range. Only have %" PRIu64 " subnets.", link->network->dhcp_pd_subnet_id, UINT64_C(1) << (64 - pd_prefix_len)); *ret = prefix; return 0; } if (dhcp_pd_get_assigned_subnet_prefix(link, pd_prefix, pd_prefix_len, ret) >= 0) return 0; for (uint64_t n = 0; ; n++) { /* If we do not have an allocation preference just iterate * through the address space and return the first free prefix. */ r = dhcp_pd_calculate_subnet_prefix(pd_prefix, pd_prefix_len, n, &prefix); if (r < 0) return log_link_warning_errno(link, r, "Couldn't find a suitable prefix. Ran out of address space."); /* Do not use explicitly requested subnet IDs. Note that the corresponding link may not * appear yet. So, we need to check the ID is not used in any .network files. */ if (set_contains(link->manager->dhcp_pd_subnet_ids, &n)) continue; /* Check that the prefix is not assigned to another link. */ if (link_get_by_dhcp_pd_subnet_prefix(link->manager, &prefix, &assigned_link) < 0 || assigned_link == link) break; } r = link_add_dhcp_pd_subnet_prefix(link, &prefix); if (r < 0) return log_link_warning_errno(link, r, "Failed to save acquired free subnet prefix: %m"); *ret = prefix; return 0; } static int dhcp_pd_assign_subnet_prefix( Link *link, const struct in6_addr *pd_prefix, uint8_t pd_prefix_len, usec_t lifetime_preferred_usec, usec_t lifetime_valid_usec, bool is_uplink) { struct in6_addr prefix; int r; assert(link); assert(link->network); assert(pd_prefix); r = dhcp_pd_get_preferred_subnet_prefix(link, pd_prefix, pd_prefix_len, &prefix); if (r < 0) return r == -ERANGE ? 0 : r; const char *pretty = IN6_ADDR_PREFIX_TO_STRING(&prefix, 64); if (link_radv_enabled(link) && link->network->dhcp_pd_announce) { if (is_uplink) log_link_debug(link, "Ignoring Announce= setting on upstream interface."); else { r = radv_add_prefix(link, &prefix, 64, lifetime_preferred_usec, lifetime_valid_usec); if (r < 0) return log_link_warning_errno(link, r, "Failed to assign/update prefix %s to IPv6 Router Advertisement: %m", pretty); } } r = dhcp_pd_request_route(link, &prefix, lifetime_valid_usec); if (r < 0) return log_link_warning_errno(link, r, "Failed to assign/update route for prefix %s: %m", pretty); r = dhcp_pd_request_address(link, &prefix, lifetime_preferred_usec, lifetime_valid_usec); if (r < 0) return log_link_warning_errno(link, r, "Failed to assign/update address for prefix %s: %m", pretty); log_link_debug(link, "Assigned prefix %s", pretty); return 1; } static int dhcp_pd_prepare(Link *link) { if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) return 0; if (!link_dhcp_pd_is_enabled(link)) return 0; if (link_radv_enabled(link) && link->network->dhcp_pd_announce && !link->radv) return 0; link_mark_addresses(link, NETWORK_CONFIG_SOURCE_DHCP_PD); manager_mark_routes(link->manager, link, NETWORK_CONFIG_SOURCE_DHCP_PD); return 1; } static int dhcp_pd_finalize(Link *link) { int r; if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) return 0; if (link->dhcp_pd_messages == 0) { link->dhcp_pd_configured = false; r = dhcp_pd_remove(link, /* only_marked = */ true); if (r < 0) return r; } if (!link->dhcp_pd_configured) link_set_state(link, LINK_STATE_CONFIGURING); link_check_ready(link); return 0; } static void dhcp_pd_mark_unreachable_route(Manager *manager, NetworkConfigSource source) { assert(manager); Route *route; SET_FOREACH(route, manager->routes) { if (route->source != source) continue; if (route->family != AF_INET6) continue; if (route->nexthop.ifindex != 0) /* IPv6 unreachable has 0 ifindex. */ continue; if (!route_type_is_reject(route->type)) continue; route_mark(route); } } static int dhcp_pd_remove_unreachable_route(Manager *manager, NetworkConfigSource source, bool only_marked) { int ret = 0; assert(manager); Route *route; SET_FOREACH(route, manager->routes) { if (route->source != source) continue; if (route->family != AF_INET6) continue; if (route->nexthop.ifindex != 0) /* IPv6 unreachable has 0 ifindex. */ continue; if (!route_type_is_reject(route->type)) continue; if (only_marked && !route_is_marked(route)) continue; RET_GATHER(ret, route_remove_and_cancel(route, manager)); } return ret; } static void dhcp_pd_prefix_lost(Link *uplink, NetworkConfigSource source) { Link *link; int r; assert(uplink); assert(uplink->manager); HASHMAP_FOREACH(link, uplink->manager->links_by_index) { if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true)) continue; r = dhcp_pd_remove(link, /* only_marked = */ false); if (r < 0) link_enter_failed(link); } (void) dhcp_pd_remove_unreachable_route(uplink->manager, source, /* only_marked = */ false); set_clear(uplink->dhcp_pd_prefixes); } void dhcp4_pd_prefix_lost(Link *uplink) { Link *tunnel; assert(uplink); assert(uplink->manager); dhcp_pd_prefix_lost(uplink, NETWORK_CONFIG_SOURCE_DHCP4); if (uplink->dhcp4_6rd_tunnel_name && link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, &tunnel) >= 0) (void) link_remove(tunnel); } void dhcp6_pd_prefix_lost(Link *uplink) { dhcp_pd_prefix_lost(uplink, NETWORK_CONFIG_SOURCE_DHCP6); } static int dhcp4_unreachable_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { int r; assert(req); assert(link); r = route_configure_handler_internal(rtnl, m, req, "Failed to set unreachable route for DHCPv4 delegated prefix"); if (r <= 0) return r; r = dhcp4_check_ready(link); if (r < 0) link_enter_failed(link); return 1; } static int dhcp6_unreachable_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) { int r; assert(req); assert(link); r = route_configure_handler_internal(rtnl, m, req, "Failed to set unreachable route for DHCPv6 delegated prefix"); if (r <= 0) return r; r = dhcp6_check_ready(link); if (r < 0) link_enter_failed(link); return 1; } static int dhcp_request_unreachable_route( Link *link, const struct in6_addr *addr, uint8_t prefixlen, usec_t lifetime_usec, NetworkConfigSource source, const union in_addr_union *server_address, uint8_t type, /* RTN_* */ unsigned *counter, route_netlink_handler_t callback, bool *configured) { _cleanup_(route_unrefp) Route *route = NULL; Route *existing; int r; assert(link); assert(link->manager); assert(addr); assert(IN_SET(source, NETWORK_CONFIG_SOURCE_DHCP4, NETWORK_CONFIG_SOURCE_DHCP6)); assert(server_address); assert(type == RTN_UNSPEC || route_type_is_reject(type)); assert(counter); assert(callback); assert(configured); if (type == RTN_UNSPEC) return 0; /* Disabled. */ if (prefixlen >= 64) { log_link_debug(link, "Not adding a blocking route for DHCP delegated prefix %s since the prefix has length >= 64.", IN6_ADDR_PREFIX_TO_STRING(addr, prefixlen)); return 0; } r = route_new(&route); if (r < 0) return log_oom(); route->source = source; route->provider = *server_address; route->family = AF_INET6; route->dst.in6 = *addr; route->dst_prefixlen = prefixlen; route->type = type; route->protocol = RTPROT_DHCP; route->priority = IP6_RT_PRIO_USER; route->lifetime_usec = lifetime_usec; r = route_adjust_nexthops(route, link); if (r < 0) return r; if (route_get(link->manager, route, &existing) < 0) *configured = false; else route_unmark(existing); r = link_request_route(link, route, counter, callback); if (r < 0) return log_link_error_errno(link, r, "Failed to request unreachable route for DHCP delegated prefix %s: %m", IN6_ADDR_PREFIX_TO_STRING(addr, prefixlen)); return 0; } static int dhcp4_request_unreachable_route( Link *link, const struct in6_addr *addr, uint8_t prefixlen, usec_t lifetime_usec, const union in_addr_union *server_address) { assert(link); assert(link->network); return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec, NETWORK_CONFIG_SOURCE_DHCP4, server_address, link->network->dhcp_6rd_prefix_route_type, &link->dhcp4_messages, dhcp4_unreachable_route_handler, &link->dhcp4_configured); } static int dhcp6_request_unreachable_route( Link *link, const struct in6_addr *addr, uint8_t prefixlen, usec_t lifetime_usec, const union in_addr_union *server_address) { assert(link); assert(link->network); return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec, NETWORK_CONFIG_SOURCE_DHCP6, server_address, link->network->dhcp6_pd_prefix_route_type, &link->dhcp6_messages, dhcp6_unreachable_route_handler, &link->dhcp6_configured); } static int dhcp_pd_prefix_add(Link *link, const struct in6_addr *prefix, uint8_t prefixlen) { struct in_addr_prefix *p; int r; assert(link); assert(prefix); p = new(struct in_addr_prefix, 1); if (!p) return log_oom(); *p = (struct in_addr_prefix) { .family = AF_INET6, .prefixlen = prefixlen, .address.in6 = *prefix, }; int log_level = set_contains(link->dhcp_pd_prefixes, p) ? LOG_DEBUG : prefixlen > 64 || prefixlen < 48 ? LOG_WARNING : LOG_INFO; log_link_full(link, log_level, "DHCP: received delegated prefix %s%s", IN6_ADDR_PREFIX_TO_STRING(prefix, prefixlen), prefixlen > 64 ? " with prefix length > 64, ignoring." : prefixlen < 48 ? " with prefix length < 48, looks unusual.": ""); /* Store PD prefix even if prefixlen > 64, not to make logged at warning level so frequently. */ r = set_ensure_consume(&link->dhcp_pd_prefixes, &in_addr_prefix_hash_ops_free, p); if (r < 0) return log_link_error_errno(link, r, "Failed to store DHCP delegated prefix %s: %m", IN6_ADDR_PREFIX_TO_STRING(prefix, prefixlen)); return 0; } static int dhcp4_pd_request_default_gateway_on_6rd_tunnel(Link *link, const struct in_addr *br_address, usec_t lifetime_usec) { _cleanup_(route_unrefp) Route *route = NULL; Route *existing; int r; assert(link); assert(link->manager); assert(br_address); r = route_new(&route); if (r < 0) return log_link_debug_errno(link, r, "Failed to allocate default gateway for DHCP delegated prefix: %m"); route->source = NETWORK_CONFIG_SOURCE_DHCP_PD; route->family = AF_INET6; route->nexthop.family = AF_INET6; route->nexthop.gw.in6.s6_addr32[3] = br_address->s_addr; route->scope = RT_SCOPE_UNIVERSE; route->protocol = RTPROT_DHCP; route->priority = IP6_RT_PRIO_USER; route->lifetime_usec = lifetime_usec; r = route_adjust_nexthops(route, link); if (r < 0) return r; if (route_get(link->manager, route, &existing) < 0) /* This is a new route. */ link->dhcp_pd_configured = false; else route_unmark(existing); r = link_request_route(link, route, &link->dhcp_pd_messages, dhcp_pd_route_handler); if (r < 0) return log_link_debug_errno(link, r, "Failed to request default gateway for DHCP delegated prefix: %m"); return 0; } static void dhcp4_calculate_pd_prefix( const struct in_addr *ipv4address, uint8_t ipv4masklen, const struct in6_addr *sixrd_prefix, uint8_t sixrd_prefixlen, struct in6_addr *ret_pd_prefix, uint8_t *ret_pd_prefixlen) { struct in6_addr pd_prefix; assert(ipv4address); assert(ipv4masklen <= 32); assert(sixrd_prefix); assert(32 - ipv4masklen + sixrd_prefixlen <= 128); assert(ret_pd_prefix); pd_prefix = *sixrd_prefix; for (unsigned i = 0; i < (unsigned) (32 - ipv4masklen); i++) if (ipv4address->s_addr & htobe32(UINT32_C(1) << (32 - ipv4masklen - i - 1))) pd_prefix.s6_addr[(i + sixrd_prefixlen) / 8] |= 1 << (7 - (i + sixrd_prefixlen) % 8); *ret_pd_prefix = pd_prefix; if (ret_pd_prefixlen) *ret_pd_prefixlen = 32 - ipv4masklen + sixrd_prefixlen; } static int dhcp4_pd_assign_subnet_prefix(Link *link, Link *uplink) { uint8_t ipv4masklen, sixrd_prefixlen, pd_prefixlen; struct in6_addr sixrd_prefix, pd_prefix; const struct in_addr *br_addresses; struct in_addr ipv4address; usec_t lifetime_usec; int r; assert(link); assert(uplink); assert(uplink->manager); assert(uplink->dhcp_lease); r = sd_dhcp_lease_get_address(uplink->dhcp_lease, &ipv4address); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 address: %m"); r = sd_dhcp_lease_get_lifetime_timestamp(uplink->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m"); r = sd_dhcp_lease_get_6rd(uplink->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, &br_addresses, NULL); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 6rd option: %m"); dhcp4_calculate_pd_prefix(&ipv4address, ipv4masklen, &sixrd_prefix, sixrd_prefixlen, &pd_prefix, &pd_prefixlen); if (pd_prefixlen > 64) return 0; r = dhcp_pd_prepare(link); if (r <= 0) return r; if (streq_ptr(uplink->dhcp4_6rd_tunnel_name, link->ifname)) { r = dhcp4_pd_request_default_gateway_on_6rd_tunnel(link, &br_addresses[0], lifetime_usec); if (r < 0) return r; } r = dhcp_pd_assign_subnet_prefix(link, &pd_prefix, pd_prefixlen, lifetime_usec, lifetime_usec, /* is_uplink = */ false); if (r < 0) return r; return dhcp_pd_finalize(link); } static int dhcp4_pd_6rd_tunnel_create_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(m); assert(link); assert(link->manager); assert(link->dhcp4_6rd_tunnel_name); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 0; r = sd_netlink_message_get_errno(m); if (r < 0) { log_link_message_warning_errno(link, m, r, "Failed to create tunnel device for DHCPv4 6rd"); link_enter_failed(link); return 0; } return 0; } int dhcp4_pd_prefix_acquired(Link *uplink) { uint8_t ipv4masklen, sixrd_prefixlen, pd_prefixlen; struct in6_addr sixrd_prefix, pd_prefix; struct in_addr ipv4address; union in_addr_union server_address; const struct in_addr *br_addresses; usec_t lifetime_usec; Link *link; int r; assert(uplink); assert(uplink->manager); assert(uplink->dhcp_lease); r = sd_dhcp_lease_get_address(uplink->dhcp_lease, &ipv4address); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 address: %m"); r = sd_dhcp_lease_get_lifetime_timestamp(uplink->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m"); r = sd_dhcp_lease_get_server_identifier(uplink->dhcp_lease, &server_address.in); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get server address of DHCPv4 lease: %m"); r = sd_dhcp_lease_get_6rd(uplink->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, &br_addresses, NULL); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get DHCPv4 6rd option: %m"); if (DEBUG_LOGGING) log_link_debug(uplink, "DHCPv4: 6rd option is acquired: IPv4_masklen=%u, 6rd_prefix=%s, br_address="IPV4_ADDRESS_FMT_STR, ipv4masklen, IN6_ADDR_PREFIX_TO_STRING(&sixrd_prefix, sixrd_prefixlen), IPV4_ADDRESS_FMT_VAL(*br_addresses)); /* Calculate PD prefix */ dhcp4_calculate_pd_prefix(&ipv4address, ipv4masklen, &sixrd_prefix, sixrd_prefixlen, &pd_prefix, &pd_prefixlen); /* Register and log PD prefix */ r = dhcp_pd_prefix_add(uplink, &pd_prefix, pd_prefixlen); if (r < 0) return r; /* Request unreachable route */ dhcp_pd_mark_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP4); r = dhcp4_request_unreachable_route(uplink, &pd_prefix, pd_prefixlen, lifetime_usec, &server_address); if (r < 0) return r; (void) dhcp_pd_remove_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP4, /* only_marked = */ true); /* Create or update 6rd SIT tunnel device. */ r = dhcp4_pd_create_6rd_tunnel(uplink, dhcp4_pd_6rd_tunnel_create_handler); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to create or update 6rd SIT tunnel: %m"); /* Then, assign subnet prefixes to downstream interfaces. */ HASHMAP_FOREACH(link, uplink->manager->links_by_index) { if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true)) continue; r = dhcp4_pd_assign_subnet_prefix(link, uplink); if (r < 0) { /* When failed on the upstream interface (i.e., the case link == uplink), * immediately abort the assignment of the prefixes. As, the all assigned * prefixes will be dropped soon in link_enter_failed(), and it is meaningless * to continue the assignment. */ if (link == uplink) return r; link_enter_failed(link); } } return 0; } static int dhcp6_pd_assign_subnet_prefixes(Link *link, Link *uplink) { int r; assert(link); assert(uplink); assert(uplink->dhcp6_lease); r = dhcp_pd_prepare(link); if (r <= 0) return r; FOREACH_DHCP6_PD_PREFIX(uplink->dhcp6_lease) { usec_t lifetime_preferred_usec, lifetime_valid_usec; struct in6_addr pd_prefix; uint8_t pd_prefix_len; r = sd_dhcp6_lease_get_pd_prefix(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len); if (r < 0) return r; if (pd_prefix_len > 64) continue; /* Mask prefix for safety. */ r = in6_addr_mask(&pd_prefix, pd_prefix_len); if (r < 0) return r; r = sd_dhcp6_lease_get_pd_lifetime_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME, &lifetime_preferred_usec, &lifetime_valid_usec); if (r < 0) return r; r = dhcp_pd_assign_subnet_prefix(link, &pd_prefix, pd_prefix_len, lifetime_preferred_usec, lifetime_valid_usec, /* is_uplink = */ link == uplink); if (r < 0) return r; } return dhcp_pd_finalize(link); } int dhcp6_pd_prefix_acquired(Link *uplink) { union in_addr_union server_address; Link *link; int r; assert(uplink); assert(uplink->dhcp6_lease); assert(uplink->manager); r = sd_dhcp6_lease_get_server_address(uplink->dhcp6_lease, &server_address.in6); if (r < 0) return log_link_warning_errno(uplink, r, "Failed to get server address of DHCPv6 lease: %m"); dhcp_pd_mark_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP6); /* First, logs acquired prefixes and request unreachable routes. */ FOREACH_DHCP6_PD_PREFIX(uplink->dhcp6_lease) { usec_t lifetime_valid_usec; struct in6_addr pd_prefix; uint8_t pd_prefix_len; r = sd_dhcp6_lease_get_pd_prefix(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len); if (r < 0) return r; /* Mask prefix for safety. */ r = in6_addr_mask(&pd_prefix, pd_prefix_len); if (r < 0) return log_link_error_errno(uplink, r, "Failed to mask DHCPv6 delegated prefix: %m"); r = dhcp_pd_prefix_add(uplink, &pd_prefix, pd_prefix_len); if (r < 0) return r; r = sd_dhcp6_lease_get_pd_lifetime_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME, NULL, &lifetime_valid_usec); if (r < 0) return r; r = dhcp6_request_unreachable_route(uplink, &pd_prefix, pd_prefix_len, lifetime_valid_usec, &server_address); if (r < 0) return r; } (void) dhcp_pd_remove_unreachable_route(uplink->manager, NETWORK_CONFIG_SOURCE_DHCP6, /* only_marked = */ true); /* Then, assign subnet prefixes. */ HASHMAP_FOREACH(link, uplink->manager->links_by_index) { if (!dhcp_pd_is_uplink(link, uplink, /* accept_auto = */ true)) continue; r = dhcp6_pd_assign_subnet_prefixes(link, uplink); if (r < 0) { /* When failed on the upstream interface (i.e., the case link == uplink), * immediately abort the assignment of the prefixes. As, the all assigned * prefixes will be dropped soon in link_enter_failed(), and it is meaningless * to continue the assignment. */ if (link == uplink) return r; link_enter_failed(link); } } return 0; } static bool dhcp4_pd_uplink_is_ready(Link *link) { assert(link); if (!link->network) return false; if (!link->network->dhcp_use_6rd) return false; if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) return false; if (!link->dhcp_client) return false; if (sd_dhcp_client_is_running(link->dhcp_client) <= 0) return false; return sd_dhcp_lease_has_6rd(link->dhcp_lease); } static bool dhcp6_pd_uplink_is_ready(Link *link) { assert(link); if (!link->network) return false; if (!link->network->dhcp6_use_pd_prefix) return false; if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) return false; if (!link->dhcp6_client) return false; if (sd_dhcp6_client_is_running(link->dhcp6_client) <= 0) return false; return sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease); } int dhcp_pd_find_uplink(Link *link, Link **ret) { Link *uplink = NULL; int r = 0; assert(link); assert(link->manager); assert(link_dhcp_pd_is_enabled(link)); assert(ret); if (link->network->dhcp_pd_uplink_name) r = link_get_by_name(link->manager, link->network->dhcp_pd_uplink_name, &uplink); else if (link->network->dhcp_pd_uplink_index > 0) r = link_get_by_index(link->manager, link->network->dhcp_pd_uplink_index, &uplink); else if (link->network->dhcp_pd_uplink_index == UPLINK_INDEX_SELF) uplink = link; if (r < 0) return r; if (uplink) { if (dhcp4_pd_uplink_is_ready(uplink)) { *ret = uplink; return AF_INET; } if (dhcp6_pd_uplink_is_ready(uplink)) { *ret = uplink; return AF_INET6; } return -EBUSY; } HASHMAP_FOREACH(uplink, link->manager->links_by_index) { /* Assume that there exists at most one link which acquired delegated prefixes. */ if (dhcp4_pd_uplink_is_ready(uplink)) { *ret = uplink; return AF_INET; } if (dhcp6_pd_uplink_is_ready(uplink)) { *ret = uplink; return AF_INET6; } } return -ENODEV; } int dhcp_request_prefix_delegation(Link *link) { Link *uplink; int r; assert(link); if (!link_dhcp_pd_is_enabled(link)) return 0; r = dhcp_pd_find_uplink(link, &uplink); if (r < 0) return 0; log_link_debug(link, "Requesting subnets of delegated prefixes acquired by DHCPv%c client on %s", r == AF_INET ? '4' : '6', uplink->ifname); return r == AF_INET ? dhcp4_pd_assign_subnet_prefix(link, uplink) : dhcp6_pd_assign_subnet_prefixes(link, uplink); } int link_drop_dhcp_pd_config(Link *link, Network *network) { assert(link); assert(link->network); if (link->network == network) return 0; /* .network file is unchanged. It is not necessary to reconfigure the client. */ if (!link_dhcp_pd_is_enabled(link)) /* Disabled now, drop all configs. */ return dhcp_pd_remove(link, /* only_marked = */ false); /* If previously explicitly disabled, then there is nothing we need to drop. * If this is called on start up, we do not know the previous settings, assume nothing changed. */ if (!network || !network->dhcp_pd) return 0; /* If at least one setting is changed, then drop all configurations. */ if (link->network->dhcp_pd_assign != network->dhcp_pd_assign || (link->network->dhcp_pd_assign && (link->network->dhcp_pd_manage_temporary_address != network->dhcp_pd_manage_temporary_address || !set_equal(link->network->dhcp_pd_tokens, network->dhcp_pd_tokens))) || link->network->dhcp_pd_subnet_id != network->dhcp_pd_subnet_id || link->network->dhcp_pd_route_metric != network->dhcp_pd_route_metric || link->network->dhcp_pd_uplink_index != network->dhcp_pd_uplink_index || !streq_ptr(link->network->dhcp_pd_uplink_name, network->dhcp_pd_uplink_name)) return dhcp_pd_remove(link, /* only_marked = */ false); return 0; } int config_parse_dhcp_pd_subnet_id( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { int64_t *p = ASSERT_PTR(data); uint64_t t; int r; assert(filename); assert(lvalue); assert(rvalue); if (isempty(rvalue) || streq(rvalue, "auto")) { *p = -1; return 0; } r = safe_atoux64(rvalue, &t); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue); return 0; } if (t > INT64_MAX) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid subnet id '%s', ignoring assignment.", rvalue); return 0; } *p = (int64_t) t; return 0; } int config_parse_dhcp_pd_prefix_route_type( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { uint8_t *p = ASSERT_PTR(data); int r; assert(filename); assert(lvalue); assert(rvalue); if (isempty(rvalue)) { *p = RTN_UNREACHABLE; /* Defaults to unreachable. */ return 0; } if (streq(rvalue, "none")) { *p = RTN_UNSPEC; /* Indicate that the route is disabled. */ return 0; } r = route_type_from_string(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue); return 0; } if (!route_type_is_reject(r)) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid route type is specified to %s=, ignoring assignment: %s", lvalue, rvalue); return 0; } *p = r; return 0; }