| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <linux/ipv6_route.h> |
| |
| #include "sd-dhcp6-client.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.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; |
| } |
| |
| bool dhcp4_lease_has_pd_prefix(sd_dhcp_lease *lease) { |
| if (!lease) |
| return false; |
| |
| return sd_dhcp_lease_get_6rd(lease, NULL, NULL, NULL, NULL, NULL) >= 0; |
| } |
| |
| bool dhcp6_lease_has_pd_prefix(sd_dhcp6_lease *lease) { |
| uint32_t lifetime_preferred_sec, lifetime_valid_sec; |
| struct in6_addr pd_prefix; |
| uint8_t pd_prefix_len; |
| |
| if (!lease) |
| return false; |
| |
| sd_dhcp6_lease_reset_pd_prefix_iter(lease); |
| |
| return sd_dhcp6_lease_get_pd(lease, &pd_prefix, &pd_prefix_len, &lifetime_preferred_sec, &lifetime_valid_sec) >= 0; |
| } |
| |
| 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(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->routes) { |
| if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD) |
| continue; |
| assert(route->family == AF_INET6); |
| |
| 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 k, r = 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->routes) { |
| if (route->source != NETWORK_CONFIG_SOURCE_DHCP_PD) |
| 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); |
| |
| k = route_remove(route); |
| if (k < 0) |
| r = k; |
| |
| route_cancel_request(route, link); |
| } |
| } 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); |
| |
| k = address_remove(address); |
| if (k < 0) |
| r = k; |
| |
| address_cancel_request(address); |
| } |
| } |
| |
| return r; |
| } |
| |
| 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(link); |
| |
| r = route_configure_handler_internal(rtnl, m, link, "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_freep) Route *route = NULL; |
| Route *existing; |
| int r; |
| |
| assert(link); |
| 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; |
| |
| if (route_get(NULL, link, route, &existing) < 0) |
| link->dhcp_pd_configured = false; |
| else |
| route_unmark(existing); |
| |
| r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp_pd_messages, |
| dhcp_pd_route_handler, NULL); |
| 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(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( |
| Link *link, |
| const struct in6_addr *prefix, |
| usec_t lifetime_preferred_usec, |
| usec_t lifetime_valid_usec) { |
| |
| _cleanup_set_free_ Set *addresses = NULL; |
| struct in6_addr *a; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(prefix); |
| |
| if (!link->network->dhcp_pd_assign) |
| return 0; |
| |
| r = dhcp_pd_generate_addresses(link, prefix, &addresses); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Failed to generate addresses for acquired DHCP delegated prefix: %m"); |
| |
| SET_FOREACH(a, addresses) { |
| _cleanup_(address_freep) Address *address = NULL; |
| Address *existing; |
| |
| 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; |
| |
| log_dhcp_pd_address(link, address); |
| |
| r = free_and_strdup_warn(&address->netlabel, link->network->dhcp_pd_netlabel); |
| if (r < 0) |
| return r; |
| |
| if (address_get(link, address, &existing) < 0) |
| link->dhcp_pd_configured = false; |
| else |
| address_unmark(existing); |
| |
| r = link_request_address(link, TAKE_PTR(address), true, &link->dhcp_pd_messages, |
| dhcp_pd_address_handler, NULL); |
| 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); |
| link_mark_routes(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; |
| } |
| |
| void dhcp_pd_prefix_lost(Link *uplink) { |
| Route *route; |
| 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); |
| } |
| |
| SET_FOREACH(route, uplink->manager->routes) { |
| if (!IN_SET(route->source, NETWORK_CONFIG_SOURCE_DHCP4, NETWORK_CONFIG_SOURCE_DHCP6)) |
| continue; |
| if (route->family != AF_INET6) |
| continue; |
| if (route->type != RTN_UNREACHABLE) |
| continue; |
| if (!set_contains(uplink->dhcp_pd_prefixes, |
| &(struct in_addr_prefix) { |
| .family = AF_INET6, |
| .prefixlen = route->dst_prefixlen, |
| .address = route->dst })) |
| continue; |
| |
| (void) route_remove(route); |
| |
| route_cancel_request(route, uplink); |
| } |
| |
| set_clear(uplink->dhcp_pd_prefixes); |
| } |
| |
| void dhcp4_pd_prefix_lost(Link *uplink) { |
| Link *tunnel; |
| |
| dhcp_pd_prefix_lost(uplink); |
| |
| if (uplink->dhcp4_6rd_tunnel_name && |
| link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, &tunnel) >= 0) |
| (void) link_remove(tunnel); |
| } |
| |
| static int dhcp4_unreachable_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, "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(link); |
| |
| r = route_configure_handler_internal(rtnl, m, link, "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, |
| unsigned *counter, |
| route_netlink_handler_t callback) { |
| |
| _cleanup_(route_freep) Route *route = NULL; |
| Route *existing; |
| int r; |
| |
| assert(link); |
| assert(addr); |
| assert(IN_SET(source, NETWORK_CONFIG_SOURCE_DHCP4, NETWORK_CONFIG_SOURCE_DHCP6)); |
| assert(server_address); |
| assert(counter); |
| assert(callback); |
| |
| 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 = RTN_UNREACHABLE; |
| route->protocol = RTPROT_DHCP; |
| route->priority = IP6_RT_PRIO_USER; |
| route->lifetime_usec = lifetime_usec; |
| |
| if (route_get(link->manager, NULL, route, &existing) < 0) |
| link->dhcp6_configured = false; |
| else |
| route_unmark(existing); |
| |
| r = link_request_route(link, TAKE_PTR(route), true, counter, callback, NULL); |
| 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) { |
| |
| return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec, |
| NETWORK_CONFIG_SOURCE_DHCP4, server_address, |
| &link->dhcp4_messages, dhcp4_unreachable_route_handler); |
| } |
| |
| 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) { |
| |
| return dhcp_request_unreachable_route(link, addr, prefixlen, lifetime_usec, |
| NETWORK_CONFIG_SOURCE_DHCP6, server_address, |
| &link->dhcp6_messages, dhcp6_unreachable_route_handler); |
| } |
| |
| 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_freep) Route *route = NULL; |
| Route *existing; |
| int r; |
| |
| assert(link); |
| 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->gw_family = AF_INET6; |
| route->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; |
| |
| if (route_get(NULL, link, route, &existing) < 0) /* This is a new route. */ |
| link->dhcp_pd_configured = false; |
| else |
| route_unmark(existing); |
| |
| r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp_pd_messages, |
| dhcp_pd_route_handler, NULL); |
| 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; |
| uint32_t lifetime_sec; |
| usec_t lifetime_usec, now_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(uplink->dhcp_lease, &lifetime_sec); |
| if (r < 0) |
| return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m"); |
| |
| assert_se(sd_event_now(uplink->manager->event, CLOCK_BOOTTIME, &now_usec) >= 0); |
| lifetime_usec = sec_to_usec(lifetime_sec, now_usec); |
| |
| 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) { |
| _cleanup_free_ char *tunnel_name = NULL; |
| 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; |
| uint32_t lifetime_sec; |
| usec_t lifetime_usec, now_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(uplink->dhcp_lease, &lifetime_sec); |
| if (r < 0) |
| return log_link_warning_errno(uplink, r, "Failed to get lifetime of DHCPv4 lease: %m"); |
| |
| assert_se(sd_event_now(uplink->manager->event, CLOCK_BOOTTIME, &now_usec) >= 0); |
| lifetime_usec = sec_to_usec(lifetime_sec, now_usec); |
| |
| 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 */ |
| r = dhcp4_request_unreachable_route(uplink, &pd_prefix, pd_prefixlen, lifetime_usec, &server_address); |
| if (r < 0) |
| return r; |
| |
| /* Generate 6rd SIT tunnel device name. */ |
| r = dhcp4_pd_create_6rd_tunnel_name(uplink, &tunnel_name); |
| if (r < 0) |
| return r; |
| |
| /* Remove old tunnel device if exists. */ |
| if (!streq_ptr(uplink->dhcp4_6rd_tunnel_name, tunnel_name)) { |
| Link *old_tunnel; |
| |
| if (uplink->dhcp4_6rd_tunnel_name && |
| link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, &old_tunnel) >= 0) |
| (void) link_remove(old_tunnel); |
| |
| free_and_replace(uplink->dhcp4_6rd_tunnel_name, tunnel_name); |
| } |
| |
| /* Create 6rd SIT tunnel device if it does not exist yet. */ |
| if (link_get_by_name(uplink->manager, uplink->dhcp4_6rd_tunnel_name, NULL) < 0) { |
| r = dhcp4_pd_create_6rd_tunnel(uplink, dhcp4_pd_6rd_tunnel_create_handler); |
| if (r < 0) |
| return r; |
| } |
| |
| /* 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) { |
| usec_t timestamp_usec; |
| int r; |
| |
| assert(link); |
| assert(uplink); |
| assert(uplink->dhcp6_lease); |
| |
| r = dhcp_pd_prepare(link); |
| if (r <= 0) |
| return r; |
| |
| r = sd_dhcp6_lease_get_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return r; |
| |
| for (sd_dhcp6_lease_reset_pd_prefix_iter(uplink->dhcp6_lease);;) { |
| uint32_t lifetime_preferred_sec, lifetime_valid_sec; |
| struct in6_addr pd_prefix; |
| uint8_t pd_prefix_len; |
| |
| r = sd_dhcp6_lease_get_pd(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len, |
| &lifetime_preferred_sec, &lifetime_valid_sec); |
| if (r < 0) |
| break; |
| |
| 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 = dhcp_pd_assign_subnet_prefix(link, &pd_prefix, pd_prefix_len, |
| sec_to_usec(lifetime_preferred_sec, timestamp_usec), |
| sec_to_usec(lifetime_valid_sec, timestamp_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; |
| usec_t timestamp_usec; |
| Link *link; |
| int r; |
| |
| assert(uplink); |
| assert(uplink->dhcp6_lease); |
| |
| 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"); |
| |
| r = sd_dhcp6_lease_get_timestamp(uplink->dhcp6_lease, CLOCK_BOOTTIME, ×tamp_usec); |
| if (r < 0) |
| return log_link_warning_errno(uplink, r, "Failed to get timestamp of DHCPv6 lease: %m"); |
| |
| /* First, logs acquired prefixes and request unreachable routes. */ |
| for (sd_dhcp6_lease_reset_pd_prefix_iter(uplink->dhcp6_lease);;) { |
| uint32_t lifetime_preferred_sec, lifetime_valid_sec; |
| struct in6_addr pd_prefix; |
| uint8_t pd_prefix_len; |
| |
| r = sd_dhcp6_lease_get_pd(uplink->dhcp6_lease, &pd_prefix, &pd_prefix_len, |
| &lifetime_preferred_sec, &lifetime_valid_sec); |
| if (r < 0) |
| break; |
| |
| /* 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 = dhcp6_request_unreachable_route(uplink, &pd_prefix, pd_prefix_len, |
| sec_to_usec(lifetime_valid_sec, timestamp_usec), |
| &server_address); |
| if (r < 0) |
| return r; |
| } |
| |
| /* 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; |
| |
| if (!link->dhcp_lease) |
| return false; |
| |
| return dhcp4_lease_has_pd_prefix(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; |
| |
| if (!link->dhcp6_lease) |
| return false; |
| |
| return 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 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; |
| } |
