| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| /*** |
| Copyright © 2014 Intel Corporation. All rights reserved. |
| ***/ |
| |
| #include <netinet/in.h> |
| #include <linux/if.h> |
| #include <linux/if_arp.h> |
| |
| #include "sd-dhcp6-client.h" |
| |
| #include "escape.h" |
| #include "hashmap.h" |
| #include "hostname-setup.h" |
| #include "hostname-util.h" |
| #include "missing_network.h" |
| #include "networkd-address.h" |
| #include "networkd-dhcp6.h" |
| #include "networkd-link.h" |
| #include "networkd-manager.h" |
| #include "networkd-queue.h" |
| #include "networkd-radv.h" |
| #include "siphash24.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "radv-internal.h" |
| #include "web-util.h" |
| |
| bool link_dhcp6_with_address_enabled(Link *link) { |
| if (!link_dhcp6_enabled(link)) |
| return false; |
| |
| return link->network->dhcp6_use_address; |
| } |
| |
| bool link_dhcp6_pd_is_enabled(Link *link) { |
| assert(link); |
| |
| if (!link->network) |
| return false; |
| |
| return link->network->dhcp6_pd; |
| } |
| |
| static bool dhcp6_lease_has_pd_prefix(sd_dhcp6_lease *lease) { |
| uint32_t lifetime_preferred, lifetime_valid; |
| 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, &lifetime_valid) >= 0; |
| } |
| |
| DHCP6DelegatedPrefix *dhcp6_pd_free(DHCP6DelegatedPrefix *p) { |
| if (!p) |
| return NULL; |
| |
| if (p->link && p->link->manager) { |
| hashmap_remove(p->link->manager->dhcp6_prefixes, &p->prefix); |
| set_remove(p->link->manager->dhcp6_pd_prefixes, p); |
| } |
| |
| link_unref(p->link); |
| return mfree(p); |
| } |
| |
| static void dhcp6_pd_hash_func(const DHCP6DelegatedPrefix *p, struct siphash *state) { |
| assert(p); |
| |
| siphash24_compress(&p->pd_prefix, sizeof(p->pd_prefix), state); |
| siphash24_compress(&p->link, sizeof(p->link), state); |
| } |
| |
| static int dhcp6_pd_compare_func(const DHCP6DelegatedPrefix *a, const DHCP6DelegatedPrefix *b) { |
| int r; |
| |
| r = memcmp(&a->pd_prefix, &b->pd_prefix, sizeof(a->pd_prefix)); |
| if (r != 0) |
| return r; |
| |
| return CMP(a->link, b->link); |
| } |
| |
| DEFINE_HASH_OPS(dhcp6_pd_hash_ops, DHCP6DelegatedPrefix, dhcp6_pd_hash_func, dhcp6_pd_compare_func); |
| |
| static Link *dhcp6_pd_get_link_by_prefix(Link *link, const struct in6_addr *prefix) { |
| DHCP6DelegatedPrefix *pd; |
| |
| assert(link); |
| assert(link->manager); |
| assert(prefix); |
| |
| pd = hashmap_get(link->manager->dhcp6_prefixes, prefix); |
| if (!pd) |
| return NULL; |
| |
| return pd->link; |
| } |
| |
| static int dhcp6_pd_get_assigned_prefix(Link *link, const struct in6_addr *pd_prefix, struct in6_addr *ret_prefix) { |
| DHCP6DelegatedPrefix *pd, in; |
| |
| assert(link); |
| assert(link->manager); |
| assert(pd_prefix); |
| assert(ret_prefix); |
| |
| in = (DHCP6DelegatedPrefix) { |
| .pd_prefix = *pd_prefix, |
| .link = link, |
| }; |
| |
| pd = set_get(link->manager->dhcp6_pd_prefixes, &in); |
| if (!pd) |
| return -ENOENT; |
| |
| *ret_prefix = pd->prefix; |
| return 0; |
| } |
| |
| static int dhcp6_pd_remove_old(Link *link, bool force); |
| |
| static int dhcp6_pd_address_callback(Address *address) { |
| Address *a; |
| |
| assert(address); |
| assert(address->link); |
| |
| /* Make this called only once */ |
| SET_FOREACH(a, address->link->dhcp6_pd_addresses) |
| a->callback = NULL; |
| |
| return dhcp6_pd_remove_old(address->link, true); |
| } |
| |
| static int dhcp6_pd_remove_old(Link *link, bool force) { |
| Address *address; |
| Route *route; |
| int k, r = 0; |
| |
| assert(link); |
| assert(link->manager); |
| |
| if (!force && (link->dhcp6_pd_address_messages > 0 || link->dhcp6_pd_route_messages > 0)) |
| return 0; |
| |
| if (set_isempty(link->dhcp6_pd_addresses_old) && set_isempty(link->dhcp6_pd_routes_old)) |
| return 0; |
| |
| if (!force) { |
| bool set_callback = !set_isempty(link->dhcp6_pd_addresses); |
| |
| SET_FOREACH(address, link->dhcp6_pd_addresses) |
| if (address_is_ready(address)) { |
| set_callback = false; |
| break; |
| } |
| |
| if (set_callback) { |
| SET_FOREACH(address, link->dhcp6_pd_addresses) |
| address->callback = dhcp6_pd_address_callback; |
| return 0; |
| } |
| } |
| |
| log_link_debug(link, "Removing old DHCPv6 Prefix Delegation addresses and routes."); |
| |
| SET_FOREACH(route, link->dhcp6_pd_routes_old) { |
| k = route_remove(route, NULL, link); |
| if (k < 0) |
| r = k; |
| |
| if (link->radv) |
| (void) sd_radv_remove_prefix(link->radv, &route->dst.in6, 64); |
| dhcp6_pd_free(hashmap_get(link->manager->dhcp6_prefixes, &route->dst.in6)); |
| } |
| |
| SET_FOREACH(address, link->dhcp6_pd_addresses_old) { |
| k = address_remove(address, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| int dhcp6_pd_remove(Link *link) { |
| Address *address; |
| Route *route; |
| int k, r = 0; |
| |
| assert(link); |
| assert(link->manager); |
| |
| if (!link_dhcp6_pd_is_enabled(link)) |
| return 0; |
| |
| link->dhcp6_pd_address_configured = false; |
| link->dhcp6_pd_route_configured = false; |
| |
| k = dhcp6_pd_remove_old(link, true); |
| if (k < 0) |
| r = k; |
| |
| if (set_isempty(link->dhcp6_pd_addresses) && set_isempty(link->dhcp6_pd_routes)) |
| return r; |
| |
| log_link_debug(link, "Removing DHCPv6 Prefix Delegation addresses and routes."); |
| |
| SET_FOREACH(route, link->dhcp6_pd_routes) { |
| k = route_remove(route, NULL, link); |
| if (k < 0) |
| r = k; |
| |
| if (link->radv) |
| (void) sd_radv_remove_prefix(link->radv, &route->dst.in6, 64); |
| dhcp6_pd_free(hashmap_get(link->manager->dhcp6_prefixes, &route->dst.in6)); |
| } |
| |
| SET_FOREACH(address, link->dhcp6_pd_addresses) { |
| k = address_remove(address, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int dhcp6_pd_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->dhcp6_pd_route_messages > 0); |
| |
| link->dhcp6_pd_route_messages--; |
| |
| r = route_configure_handler_internal(rtnl, m, link, "Failed to add DHCPv6 Prefix Delegation route"); |
| if (r <= 0) |
| return r; |
| |
| if (link->dhcp6_pd_route_messages == 0) { |
| log_link_debug(link, "DHCPv6 prefix delegation routes set"); |
| if (link->dhcp6_pd_prefixes_assigned) |
| link->dhcp6_pd_route_configured = true; |
| |
| r = dhcp6_pd_remove_old(link, false); |
| if (r < 0) { |
| link_enter_failed(link); |
| return 1; |
| } |
| |
| link_check_ready(link); |
| } |
| |
| return 1; |
| } |
| |
| static int dhcp6_pd_after_route_configure(Request *req, void *object) { |
| Route *route = object; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ROUTE); |
| assert(route); |
| |
| link = req->link; |
| |
| r = set_ensure_put(&link->dhcp6_pd_routes, &route_hash_ops, route); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store DHCPv6 prefix route: %m"); |
| |
| set_remove(link->dhcp6_pd_routes_old, route); |
| |
| return 0; |
| } |
| |
| static int dhcp6_pd_request_route(Link *link, const struct in6_addr *prefix, const struct in6_addr *pd_prefix) { |
| _cleanup_(dhcp6_pd_freep) DHCP6DelegatedPrefix *pd = NULL; |
| _cleanup_(route_freep) Route *route = NULL; |
| Link *assigned_link; |
| Request *req; |
| int r; |
| |
| assert(link); |
| assert(link->manager); |
| assert(prefix); |
| assert(pd_prefix); |
| |
| r = route_new(&route); |
| if (r < 0) |
| return r; |
| |
| route->family = AF_INET6; |
| route->dst.in6 = *prefix; |
| route->dst_prefixlen = 64; |
| route->protocol = RTPROT_DHCP; |
| route->priority = link->network->dhcp6_pd_route_metric; |
| |
| r = link_has_route(link, route); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| link->dhcp6_pd_route_configured = false; |
| |
| r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp6_pd_route_messages, |
| dhcp6_pd_route_handler, &req); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to request DHCPv6 prefix route: %m"); |
| if (r == 0) |
| return 0; |
| |
| req->after_configure = dhcp6_pd_after_route_configure; |
| |
| assigned_link = dhcp6_pd_get_link_by_prefix(link, prefix); |
| if (assigned_link) { |
| assert(assigned_link == link); |
| return 0; |
| } |
| |
| pd = new(DHCP6DelegatedPrefix, 1); |
| if (!pd) |
| return log_oom(); |
| |
| *pd = (DHCP6DelegatedPrefix) { |
| .prefix = *prefix, |
| .pd_prefix = *pd_prefix, |
| .link = link_ref(link), |
| }; |
| |
| r = hashmap_ensure_put(&link->manager->dhcp6_prefixes, &in6_addr_hash_ops, &pd->prefix, pd); |
| if (r == -ENOMEM) |
| return log_oom(); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store DHCPv6 prefix route at manager: %m"); |
| |
| r = set_ensure_put(&link->manager->dhcp6_pd_prefixes, &dhcp6_pd_hash_ops, pd); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store DHCPv6 prefix route at manager: %m"); |
| |
| TAKE_PTR(pd); |
| return 0; |
| } |
| |
| static int dhcp6_pd_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->dhcp6_pd_address_messages > 0); |
| |
| link->dhcp6_pd_address_messages--; |
| |
| r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCPv6 delegated prefix address"); |
| if (r <= 0) |
| return r; |
| |
| if (link->dhcp6_pd_address_messages == 0) { |
| log_link_debug(link, "DHCPv6 delegated prefix addresses set"); |
| if (link->dhcp6_pd_prefixes_assigned) |
| link->dhcp6_pd_address_configured = true; |
| |
| r = dhcp6_pd_remove_old(link, false); |
| if (r < 0) { |
| link_enter_failed(link); |
| return 1; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static void log_dhcp6_pd_address(Link *link, const Address *address) { |
| char valid_buf[FORMAT_TIMESPAN_MAX], preferred_buf[FORMAT_TIMESPAN_MAX]; |
| const char *valid_str = NULL, *preferred_str = NULL; |
| _cleanup_free_ char *buffer = NULL; |
| int log_level; |
| |
| assert(address); |
| assert(address->family == AF_INET6); |
| |
| log_level = address_get(link, address, NULL) >= 0 ? LOG_DEBUG : LOG_INFO; |
| |
| if (log_level < log_get_max_level()) |
| return; |
| |
| (void) in6_addr_prefix_to_string(&address->in_addr.in6, address->prefixlen, &buffer); |
| if (address->cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME) |
| valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX, |
| address->cinfo.ifa_valid * USEC_PER_SEC, |
| USEC_PER_SEC); |
| if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME) |
| preferred_str = format_timespan(preferred_buf, FORMAT_TIMESPAN_MAX, |
| address->cinfo.ifa_prefered * USEC_PER_SEC, |
| USEC_PER_SEC); |
| |
| log_link_full(link, log_level, "DHCPv6-PD address %s (valid %s%s, preferred %s%s)", |
| strna(buffer), |
| valid_str ? "for " : "forever", strempty(valid_str), |
| preferred_str ? "for " : "forever", strempty(preferred_str)); |
| } |
| |
| static int dhcp6_pd_after_address_configure(Request *req, void *object) { |
| Address *address = object; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ADDRESS); |
| assert(address); |
| |
| link = req->link; |
| |
| r = set_ensure_put(&link->dhcp6_pd_addresses, &address_hash_ops, address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store DHCPv6 delegated prefix address: %m"); |
| |
| set_remove(link->dhcp6_pd_addresses_old, address); |
| |
| return 0; |
| } |
| |
| static int dhcp6_pd_request_address( |
| Link *link, |
| const struct in6_addr *prefix, |
| uint32_t lifetime_preferred, |
| uint32_t lifetime_valid) { |
| |
| _cleanup_(address_freep) Address *address = NULL; |
| Request *req; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(prefix); |
| |
| if (!link->network->dhcp6_pd_assign) |
| return 0; |
| |
| r = address_new(&address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to allocate address for DHCPv6 delegated prefix: %m"); |
| |
| address->in_addr.in6 = *prefix; |
| |
| if (in6_addr_is_set(&link->network->dhcp6_pd_token)) |
| memcpy(address->in_addr.in6.s6_addr + 8, link->network->dhcp6_pd_token.s6_addr + 8, 8); |
| else { |
| r = generate_ipv6_eui_64_address(link, &address->in_addr.in6); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Failed to generate EUI64 address for acquired DHCPv6 delegated prefix: %m"); |
| } |
| |
| address->prefixlen = 64; |
| address->family = AF_INET6; |
| address->cinfo.ifa_prefered = lifetime_preferred; |
| address->cinfo.ifa_valid = lifetime_valid; |
| SET_FLAG(address->flags, IFA_F_MANAGETEMPADDR, link->network->dhcp6_pd_manage_temporary_address); |
| address->route_metric = link->network->dhcp6_pd_route_metric; |
| |
| log_dhcp6_pd_address(link, address); |
| |
| if (address_get(link, address, NULL) < 0) |
| link->dhcp6_pd_address_configured = false; |
| |
| r = link_request_address(link, TAKE_PTR(address), true, &link->dhcp6_pd_address_messages, |
| dhcp6_pd_address_handler, &req); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to request DHCPv6 delegated prefix address: %m"); |
| if (r == 0) |
| return 0; |
| |
| req->after_configure = dhcp6_pd_after_address_configure; |
| |
| return 0; |
| } |
| |
| static int dhcp6_pd_assign_prefix( |
| Link *link, |
| const struct in6_addr *prefix, |
| const struct in6_addr *pd_prefix, |
| uint32_t lifetime_preferred, |
| uint32_t lifetime_valid) { |
| |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(prefix); |
| |
| if (link->network->dhcp6_pd_announce) { |
| r = radv_add_prefix(link, prefix, 64, lifetime_preferred, lifetime_valid); |
| if (r < 0) |
| return r; |
| } |
| |
| r = dhcp6_pd_request_route(link, prefix, pd_prefix); |
| if (r < 0) |
| return r; |
| |
| r = dhcp6_pd_request_address(link, prefix, lifetime_preferred, lifetime_valid); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static bool link_has_preferred_subnet_id(Link *link) { |
| if (!link->network) |
| return false; |
| |
| return link->network->dhcp6_pd_subnet_id >= 0; |
| } |
| |
| static int dhcp6_get_preferred_delegated_prefix( |
| Link *link, |
| const struct in6_addr *masked_pd_prefix, |
| uint8_t pd_prefix_len, |
| struct in6_addr *ret) { |
| |
| /* We start off with the original PD prefix we have been assigned and iterate from there */ |
| union in_addr_union prefix; |
| uint64_t n_prefixes; |
| Link *assigned_link; |
| int r; |
| |
| assert(link); |
| assert(link->manager); |
| assert(masked_pd_prefix); |
| assert(pd_prefix_len <= 64); |
| |
| n_prefixes = UINT64_C(1) << (64 - pd_prefix_len); |
| prefix.in6 = *masked_pd_prefix; |
| |
| if (link_has_preferred_subnet_id(link)) { |
| uint64_t subnet_id = link->network->dhcp6_pd_subnet_id; |
| |
| /* If the link has a preference for a particular subnet id try to allocate that */ |
| if (subnet_id >= n_prefixes) |
| return log_link_warning_errno(link, SYNTHETIC_ERRNO(ERANGE), |
| "subnet id %" PRIu64 " is out of range. Only have %" PRIu64 " subnets.", |
| subnet_id, n_prefixes); |
| |
| r = in_addr_prefix_nth(AF_INET6, &prefix, 64, subnet_id); |
| if (r < 0) |
| return log_link_warning_errno(link, r, |
| "subnet id %" PRIu64 " is out of range. Only have %" PRIu64 " subnets.", |
| subnet_id, n_prefixes); |
| |
| /* Verify that the prefix we did calculate fits in the pd prefix. |
| * This should not fail as we checked the prefix size beforehand */ |
| assert_se(in_addr_prefix_covers(AF_INET6, (const union in_addr_union*) masked_pd_prefix, pd_prefix_len, &prefix) > 0); |
| |
| assigned_link = dhcp6_pd_get_link_by_prefix(link, &prefix.in6); |
| if (assigned_link && assigned_link != link) { |
| _cleanup_free_ char *assigned_buf = NULL; |
| |
| (void) in6_addr_to_string(&prefix.in6, &assigned_buf); |
| return log_link_warning_errno(link, SYNTHETIC_ERRNO(EAGAIN), |
| "The requested prefix %s is already assigned to another link.", |
| strna(assigned_buf)); |
| } |
| |
| *ret = prefix.in6; |
| return 0; |
| } |
| |
| for (uint64_t n = 0; n < n_prefixes; n++) { |
| /* If we do not have an allocation preference just iterate |
| * through the address space and return the first free prefix. */ |
| assigned_link = dhcp6_pd_get_link_by_prefix(link, &prefix.in6); |
| if (!assigned_link || assigned_link == link) { |
| *ret = prefix.in6; |
| return 0; |
| } |
| |
| r = in_addr_prefix_next(AF_INET6, &prefix, 64); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Can't allocate another prefix. Out of address space?: %m"); |
| } |
| |
| return log_link_warning_errno(link, SYNTHETIC_ERRNO(ERANGE), "Couldn't find a suitable prefix. Ran out of address space."); |
| } |
| |
| static void dhcp6_pd_prefix_distribute(Link *dhcp6_link, |
| const struct in6_addr *masked_pd_prefix, |
| uint8_t pd_prefix_len, |
| uint32_t lifetime_preferred, |
| uint32_t lifetime_valid, |
| bool assign_preferred_subnet_id) { |
| |
| Link *link; |
| int r; |
| |
| assert(dhcp6_link); |
| assert(dhcp6_link->manager); |
| assert(masked_pd_prefix); |
| assert(pd_prefix_len <= 64); |
| |
| HASHMAP_FOREACH(link, dhcp6_link->manager->links_by_index) { |
| _cleanup_free_ char *assigned_buf = NULL; |
| struct in6_addr assigned_prefix; |
| |
| if (link == dhcp6_link) |
| continue; |
| |
| if (!link_dhcp6_pd_is_enabled(link)) |
| continue; |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| continue; |
| |
| if (assign_preferred_subnet_id != link_has_preferred_subnet_id(link)) |
| continue; |
| |
| r = dhcp6_pd_get_assigned_prefix(link, masked_pd_prefix, &assigned_prefix); |
| if (r < 0) { |
| r = dhcp6_get_preferred_delegated_prefix(link, masked_pd_prefix, pd_prefix_len, &assigned_prefix); |
| if (r < 0) { |
| link->dhcp6_pd_prefixes_assigned = false; |
| continue; |
| } |
| } |
| |
| (void) in6_addr_to_string(&assigned_prefix, &assigned_buf); |
| r = dhcp6_pd_assign_prefix(link, &assigned_prefix, masked_pd_prefix, |
| lifetime_preferred, lifetime_valid); |
| if (r < 0) { |
| log_link_error_errno(link, r, "Unable to assign/update prefix %s/64: %m", |
| strna(assigned_buf)); |
| link_enter_failed(link); |
| } else |
| log_link_debug(link, "Assigned prefix %s/64", strna(assigned_buf)); |
| } |
| } |
| |
| static int dhcp6_pd_prepare(Link *link) { |
| Address *address; |
| Route *route; |
| int r; |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return 0; |
| |
| if (!link_dhcp6_pd_is_enabled(link)) |
| return 0; |
| |
| link->dhcp6_pd_prefixes_assigned = true; |
| |
| while ((address = set_steal_first(link->dhcp6_pd_addresses))) { |
| r = set_ensure_put(&link->dhcp6_pd_addresses_old, &address_hash_ops, address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store old DHCPv6 Prefix Delegation address: %m"); |
| } |
| |
| while ((route = set_steal_first(link->dhcp6_pd_routes))) { |
| r = set_ensure_put(&link->dhcp6_pd_routes_old, &route_hash_ops, route); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store old DHCPv6 Prefix Delegation route: %m"); |
| } |
| |
| return 0; |
| } |
| |
| static int dhcp6_pd_finalize(Link *link) { |
| int r; |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return 0; |
| |
| if (!link_dhcp6_pd_is_enabled(link)) |
| return 0; |
| |
| if (link->dhcp6_pd_address_messages == 0) { |
| if (link->dhcp6_pd_prefixes_assigned) |
| link->dhcp6_pd_address_configured = true; |
| } else |
| log_link_debug(link, "Setting DHCPv6 PD addresses"); |
| |
| if (link->dhcp6_pd_route_messages == 0) { |
| if (link->dhcp6_pd_prefixes_assigned) |
| link->dhcp6_pd_route_configured = true; |
| } else |
| log_link_debug(link, "Setting DHCPv6 PD routes"); |
| |
| r = dhcp6_pd_remove_old(link, false); |
| if (r < 0) |
| return r; |
| |
| if (!link->dhcp6_pd_address_configured || !link->dhcp6_pd_route_configured) |
| link_set_state(link, LINK_STATE_CONFIGURING); |
| |
| link_check_ready(link); |
| return 0; |
| } |
| |
| static void dhcp6_pd_prefix_lost(Link *dhcp6_link) { |
| Link *link; |
| int r; |
| |
| assert(dhcp6_link); |
| assert(dhcp6_link->manager); |
| |
| HASHMAP_FOREACH(link, dhcp6_link->manager->links_by_index) { |
| if (link == dhcp6_link) |
| continue; |
| |
| r = dhcp6_pd_remove(link); |
| if (r < 0) |
| link_enter_failed(link); |
| } |
| |
| set_clear(dhcp6_link->dhcp6_pd_prefixes); |
| } |
| |
| static int dhcp6_remove_old(Link *link, bool force); |
| |
| static int dhcp6_address_callback(Address *address) { |
| Address *a; |
| |
| assert(address); |
| assert(address->link); |
| |
| /* Make this called only once */ |
| SET_FOREACH(a, address->link->dhcp6_addresses) |
| a->callback = NULL; |
| |
| return dhcp6_remove_old(address->link, true); |
| } |
| |
| static int dhcp6_remove_old(Link *link, bool force) { |
| Address *address; |
| Route *route; |
| int k, r = 0; |
| |
| assert(link); |
| |
| if (!force && (link->dhcp6_address_messages > 0 || link->dhcp6_route_messages > 0)) |
| return 0; |
| |
| if (set_isempty(link->dhcp6_addresses_old) && set_isempty(link->dhcp6_routes_old)) |
| return 0; |
| |
| if (!force) { |
| bool set_callback = !set_isempty(link->dhcp6_addresses); |
| |
| SET_FOREACH(address, link->dhcp6_addresses) |
| if (address_is_ready(address)) { |
| set_callback = false; |
| break; |
| } |
| |
| if (set_callback) { |
| SET_FOREACH(address, link->dhcp6_addresses) |
| address->callback = dhcp6_address_callback; |
| return 0; |
| } |
| } |
| |
| log_link_debug(link, "Removing old DHCPv6 addresses and routes."); |
| |
| SET_FOREACH(route, link->dhcp6_routes_old) { |
| k = route_remove(route, NULL, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| SET_FOREACH(address, link->dhcp6_addresses_old) { |
| k = address_remove(address, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int dhcp6_remove(Link *link) { |
| Address *address; |
| Route *route; |
| int k, r = 0; |
| |
| assert(link); |
| |
| link->dhcp6_address_configured = false; |
| link->dhcp6_route_configured = false; |
| |
| k = dhcp6_remove_old(link, true); |
| if (k < 0) |
| r = k; |
| |
| if (set_isempty(link->dhcp6_addresses) && set_isempty(link->dhcp6_routes)) |
| return r; |
| |
| log_link_debug(link, "Removing DHCPv6 addresses and routes."); |
| |
| SET_FOREACH(route, link->dhcp6_routes) { |
| k = route_remove(route, NULL, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| SET_FOREACH(address, link->dhcp6_addresses) { |
| k = address_remove(address, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int dhcp6_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->dhcp6_route_messages > 0); |
| |
| link->dhcp6_route_messages--; |
| |
| r = route_configure_handler_internal(rtnl, m, link, "Failed to set unreachable route for DHCPv6 delegated subnet"); |
| if (r <= 0) |
| return r; |
| |
| if (link->dhcp6_route_messages == 0) { |
| log_link_debug(link, "Unreachable routes for DHCPv6 delegated subnets set"); |
| link->dhcp6_route_configured = true; |
| |
| r = dhcp6_remove_old(link, false); |
| if (r < 0) { |
| link_enter_failed(link); |
| return 1; |
| } |
| |
| link_check_ready(link); |
| } |
| |
| return 1; |
| } |
| |
| static int dhcp6_after_route_configure(Request *req, void *object) { |
| Route *route = object; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ROUTE); |
| assert(route); |
| |
| link = req->link; |
| |
| r = set_ensure_put(&link->dhcp6_routes, &route_hash_ops, route); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store unreachable route for DHCPv6 delegated subnet: %m"); |
| |
| set_remove(link->dhcp6_routes_old, route); |
| |
| return 0; |
| } |
| |
| static int dhcp6_request_unreachable_route(Link *link, const struct in6_addr *addr, uint8_t prefixlen) { |
| _cleanup_(route_freep) Route *route = NULL; |
| _cleanup_free_ char *buf = NULL; |
| Request *req; |
| int r; |
| |
| assert(link); |
| assert(addr); |
| |
| (void) in6_addr_prefix_to_string(addr, prefixlen, &buf); |
| |
| if (prefixlen == 64) { |
| log_link_debug(link, "Not adding a blocking route for DHCPv6 delegated subnet %s since distributed prefix is 64", |
| strna(buf)); |
| return 0; |
| } |
| |
| r = route_new(&route); |
| if (r < 0) |
| return log_oom(); |
| |
| route->family = AF_INET6; |
| route->dst.in6 = *addr; |
| route->dst_prefixlen = prefixlen; |
| route->table = link_get_dhcp_route_table(link); |
| route->type = RTN_UNREACHABLE; |
| route->protocol = RTPROT_DHCP; |
| |
| r = link_has_route(link, route); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| link->dhcp6_route_configured = false; |
| |
| r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp6_route_messages, |
| dhcp6_route_handler, &req); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to request unreachable route for DHCPv6 delegated subnet %s: %m", |
| strna(buf)); |
| if (r == 0) |
| return 0; |
| |
| req->after_configure = dhcp6_after_route_configure; |
| |
| return 0; |
| } |
| |
| static int dhcp6_pd_prefix_add(Link *link, const struct in6_addr *prefix, uint8_t prefixlen) { |
| _cleanup_free_ struct in_addr_prefix *p = NULL; |
| _cleanup_free_ char *buf = NULL; |
| 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, |
| }; |
| |
| (void) in6_addr_prefix_to_string(prefix, prefixlen, &buf); |
| |
| log_link_full(link, |
| set_contains(link->dhcp6_pd_prefixes, p) ? LOG_DEBUG : |
| prefixlen > 64 || prefixlen < 48 ? LOG_WARNING : LOG_INFO, |
| "DHCP6: received PD Prefix %s%s", |
| strna(buf), |
| 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_put(&link->dhcp6_pd_prefixes, &in_addr_prefix_hash_ops_free, p); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store DHCP6 PD prefix %s: %m", strna(buf)); |
| if (r > 0) |
| TAKE_PTR(p); |
| |
| return prefixlen <= 64; |
| } |
| |
| static int dhcp6_pd_prefix_acquired(Link *dhcp6_link) { |
| Link *link; |
| int r; |
| |
| assert(dhcp6_link); |
| assert(dhcp6_link->dhcp6_lease); |
| |
| HASHMAP_FOREACH(link, dhcp6_link->manager->links_by_index) { |
| if (link == dhcp6_link) |
| continue; |
| |
| r = dhcp6_pd_prepare(link); |
| if (r < 0) |
| link_enter_failed(link); |
| } |
| |
| for (sd_dhcp6_lease_reset_pd_prefix_iter(dhcp6_link->dhcp6_lease);;) { |
| uint32_t lifetime_preferred, lifetime_valid; |
| struct in6_addr pd_prefix; |
| union in_addr_union prefix; |
| uint8_t pd_prefix_len; |
| |
| r = sd_dhcp6_lease_get_pd(dhcp6_link->dhcp6_lease, &pd_prefix, &pd_prefix_len, |
| &lifetime_preferred, &lifetime_valid); |
| if (r < 0) |
| break; |
| |
| r = dhcp6_pd_prefix_add(dhcp6_link, &pd_prefix, pd_prefix_len); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| continue; |
| |
| r = dhcp6_request_unreachable_route(dhcp6_link, &pd_prefix, pd_prefix_len); |
| if (r < 0) |
| return r; |
| |
| /* We are doing prefix allocation in two steps: |
| * 1. all those links that have a preferred subnet id will be assigned their subnet |
| * 2. all those links that remain will receive prefixes in sequential order. Prefixes |
| * that were previously already allocated to another link will be skipped. |
| * The assignment has to be split in two phases since subnet id |
| * preferences should be honored. Meaning that any subnet id should be |
| * handed out to the requesting link and not to some link that didn't |
| * specify any preference. */ |
| |
| assert(pd_prefix_len <= 64); |
| |
| prefix.in6 = pd_prefix; |
| r = in_addr_mask(AF_INET6, &prefix, pd_prefix_len); |
| if (r < 0) |
| return log_link_error_errno(dhcp6_link, r, "Failed to mask DHCPv6 PD prefix: %m"); |
| |
| if (DEBUG_LOGGING) { |
| uint64_t n_prefixes = UINT64_C(1) << (64 - pd_prefix_len); |
| _cleanup_free_ char *buf = NULL; |
| |
| (void) in6_addr_prefix_to_string(&prefix.in6, pd_prefix_len, &buf); |
| log_link_debug(dhcp6_link, "Assigning up to %" PRIu64 " prefixes from %s", |
| n_prefixes, strna(buf)); |
| } |
| |
| dhcp6_pd_prefix_distribute(dhcp6_link, |
| &prefix.in6, |
| pd_prefix_len, |
| lifetime_preferred, |
| lifetime_valid, |
| true); |
| |
| dhcp6_pd_prefix_distribute(dhcp6_link, |
| &prefix.in6, |
| pd_prefix_len, |
| lifetime_preferred, |
| lifetime_valid, |
| false); |
| } |
| |
| HASHMAP_FOREACH(link, dhcp6_link->manager->links_by_index) { |
| if (link == dhcp6_link) |
| continue; |
| |
| r = dhcp6_pd_finalize(link); |
| if (r < 0) |
| link_enter_failed(link); |
| } |
| |
| return 0; |
| } |
| |
| static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->dhcp6_address_messages > 0); |
| |
| link->dhcp6_address_messages--; |
| |
| r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCPv6 address"); |
| if (r <= 0) |
| return r; |
| |
| if (link->dhcp6_address_messages == 0) { |
| log_link_debug(link, "DHCPv6 addresses set"); |
| link->dhcp6_address_configured = true; |
| |
| r = dhcp6_remove_old(link, false); |
| if (r < 0) { |
| link_enter_failed(link); |
| return 1; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static void log_dhcp6_address(Link *link, const Address *address, char **ret) { |
| char valid_buf[FORMAT_TIMESPAN_MAX], preferred_buf[FORMAT_TIMESPAN_MAX]; |
| const char *valid_str = NULL, *preferred_str = NULL; |
| _cleanup_free_ char *buffer = NULL; |
| bool by_ndisc = false; |
| Address *existing; |
| NDiscAddress *na; |
| int log_level, r; |
| |
| assert(link); |
| assert(address); |
| assert(address->family == AF_INET6); |
| |
| (void) in6_addr_prefix_to_string(&address->in_addr.in6, address->prefixlen, &buffer); |
| if (address->cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME) |
| valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX, |
| address->cinfo.ifa_valid * USEC_PER_SEC, |
| USEC_PER_SEC); |
| if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME) |
| preferred_str = format_timespan(preferred_buf, FORMAT_TIMESPAN_MAX, |
| address->cinfo.ifa_prefered * USEC_PER_SEC, |
| USEC_PER_SEC); |
| |
| r = address_get(link, address, &existing); |
| if (r < 0) { |
| /* New address. */ |
| log_level = LOG_INFO; |
| goto simple_log; |
| } else |
| log_level = LOG_DEBUG; |
| |
| if (set_contains(link->dhcp6_addresses, address)) |
| /* Already warned. */ |
| goto simple_log; |
| |
| if (address->prefixlen == existing->prefixlen) |
| /* Currently, only conflict in prefix length is reported. */ |
| goto simple_log; |
| |
| SET_FOREACH(na, link->ndisc_addresses) |
| if (address_compare_func(na->address, existing)) { |
| by_ndisc = true; |
| break; |
| } |
| |
| log_link_warning(link, "DHCPv6 address %s (valid %s%s, preferred %s%s) conflicts the existing address %s %s.", |
| strna(buffer), |
| valid_str ? "for " : "forever", strempty(valid_str), |
| preferred_str ? "for " : "forever", strempty(preferred_str), |
| strna(buffer), |
| by_ndisc ? "assigned by NDISC. Please try to use or update IPv6Token= setting " |
| "to change the address generated by NDISC, or disable UseAutonomousPrefix=" : ""); |
| goto finalize; |
| |
| simple_log: |
| log_link_full(link, log_level, "DHCPv6 address %s (valid %s%s, preferred %s%s)", |
| strna(buffer), |
| valid_str ? "for " : "forever", strempty(valid_str), |
| preferred_str ? "for " : "forever", strempty(preferred_str)); |
| |
| finalize: |
| if (ret) |
| *ret = TAKE_PTR(buffer); |
| } |
| |
| static int dhcp6_after_address_configure(Request *req, void *object) { |
| Address *address = object; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ADDRESS); |
| assert(address); |
| |
| link = req->link; |
| |
| r = set_ensure_put(&link->dhcp6_addresses, &address_hash_ops, address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store DHCPv6 address: %m"); |
| |
| set_remove(link->dhcp6_addresses_old, address); |
| |
| return 0; |
| } |
| |
| static int dhcp6_request_address( |
| Link *link, |
| const struct in6_addr *ip6_addr, |
| uint32_t lifetime_preferred, |
| uint32_t lifetime_valid) { |
| |
| _cleanup_(address_freep) Address *addr = NULL; |
| _cleanup_free_ char *buffer = NULL; |
| Request *req; |
| int r; |
| |
| r = address_new(&addr); |
| if (r < 0) |
| return log_oom(); |
| |
| addr->family = AF_INET6; |
| addr->in_addr.in6 = *ip6_addr; |
| addr->flags = IFA_F_NOPREFIXROUTE; |
| addr->prefixlen = 128; |
| addr->cinfo.ifa_prefered = lifetime_preferred; |
| addr->cinfo.ifa_valid = lifetime_valid; |
| |
| log_dhcp6_address(link, addr, &buffer); |
| |
| if (address_get(link, addr, NULL) < 0) |
| link->dhcp6_address_configured = false; |
| |
| r = link_request_address(link, TAKE_PTR(addr), true, &link->dhcp6_address_messages, |
| dhcp6_address_handler, &req); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to request DHCPv6 address %s: %m", strna(buffer)); |
| if (r == 0) |
| return 0; |
| |
| req->after_configure = dhcp6_after_address_configure; |
| |
| return 0; |
| } |
| |
| static int dhcp6_address_acquired(Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->dhcp6_lease); |
| |
| if (!link->network->dhcp6_use_address) |
| return 0; |
| |
| for (sd_dhcp6_lease_reset_address_iter(link->dhcp6_lease);;) { |
| uint32_t lifetime_preferred, lifetime_valid; |
| struct in6_addr ip6_addr; |
| |
| r = sd_dhcp6_lease_get_address(link->dhcp6_lease, &ip6_addr, &lifetime_preferred, &lifetime_valid); |
| if (r < 0) |
| break; |
| |
| r = dhcp6_request_address(link, &ip6_addr, lifetime_preferred, lifetime_valid); |
| if (r < 0) |
| return r; |
| } |
| |
| if (link->network->dhcp6_use_hostname) { |
| const char *dhcpname = NULL; |
| _cleanup_free_ char *hostname = NULL; |
| |
| (void) sd_dhcp6_lease_get_fqdn(link->dhcp6_lease, &dhcpname); |
| |
| if (dhcpname) { |
| r = shorten_overlong(dhcpname, &hostname); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname); |
| if (r == 1) |
| log_link_notice(link, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname, hostname); |
| } |
| if (hostname) { |
| r = manager_set_hostname(link->manager, hostname); |
| if (r < 0) |
| log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int dhcp6_lease_ip_acquired(sd_dhcp6_client *client, Link *link) { |
| _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease_old = NULL; |
| sd_dhcp6_lease *lease; |
| Address *a; |
| Route *rt; |
| int r; |
| |
| while ((a = set_steal_first(link->dhcp6_addresses))) { |
| r = set_ensure_put(&link->dhcp6_addresses_old, &address_hash_ops, a); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store old DHCPv6 address: %m"); |
| } |
| |
| while ((rt = set_steal_first(link->dhcp6_routes))) { |
| r = set_ensure_put(&link->dhcp6_routes_old, &route_hash_ops, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store old DHCPv6 route: %m"); |
| } |
| |
| r = sd_dhcp6_client_get_lease(client, &lease); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get DHCPv6 lease: %m"); |
| |
| lease_old = TAKE_PTR(link->dhcp6_lease); |
| link->dhcp6_lease = sd_dhcp6_lease_ref(lease); |
| |
| r = dhcp6_address_acquired(link); |
| if (r < 0) |
| return r; |
| |
| if (dhcp6_lease_has_pd_prefix(lease)) { |
| r = dhcp6_pd_prefix_acquired(link); |
| if (r < 0) |
| return r; |
| } else if (dhcp6_lease_has_pd_prefix(lease_old)) |
| /* When we had PD prefixes but not now, we need to remove them. */ |
| dhcp6_pd_prefix_lost(link); |
| |
| if (link->dhcp6_address_messages == 0) |
| link->dhcp6_address_configured = true; |
| else |
| log_link_debug(link, "Setting DHCPv6 addresses"); |
| |
| if (link->dhcp6_route_messages == 0) |
| link->dhcp6_route_configured = true; |
| else |
| log_link_debug(link, "Setting unreachable routes for DHCPv6 delegated subnets"); |
| |
| r = dhcp6_remove_old(link, false); |
| if (r < 0) |
| return r; |
| |
| if (!link->dhcp6_address_configured || !link->dhcp6_route_configured) |
| link_set_state(link, LINK_STATE_CONFIGURING); |
| |
| link_check_ready(link); |
| return 0; |
| } |
| |
| static int dhcp6_lease_information_acquired(sd_dhcp6_client *client, Link *link) { |
| return 0; |
| } |
| |
| static int dhcp6_lease_lost(Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->manager); |
| |
| log_link_info(link, "DHCPv6 lease lost"); |
| |
| if (dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) |
| dhcp6_pd_prefix_lost(link); |
| |
| link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease); |
| |
| r = dhcp6_remove(link); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return; |
| |
| switch (event) { |
| case SD_DHCP6_CLIENT_EVENT_STOP: |
| case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE: |
| case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX: |
| r = dhcp6_lease_lost(link); |
| if (r < 0) |
| link_enter_failed(link); |
| break; |
| |
| case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE: |
| r = dhcp6_lease_ip_acquired(client, link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| |
| _fallthrough_; |
| case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST: |
| r = dhcp6_lease_information_acquired(client, link); |
| if (r < 0) |
| link_enter_failed(link); |
| break; |
| |
| default: |
| if (event < 0) |
| log_link_warning_errno(link, event, "DHCPv6 error: %m"); |
| else |
| log_link_warning(link, "DHCPv6 unknown event: %d", event); |
| return; |
| } |
| } |
| |
| int dhcp6_request_information(Link *link, int ir) { |
| int r, inf_req, pd; |
| bool running; |
| |
| assert(link); |
| assert(link->dhcp6_client); |
| assert(link->network); |
| assert(in6_addr_is_link_local(&link->ipv6ll_address)); |
| |
| r = sd_dhcp6_client_is_running(link->dhcp6_client); |
| if (r < 0) |
| return r; |
| running = r; |
| |
| r = sd_dhcp6_client_get_prefix_delegation(link->dhcp6_client, &pd); |
| if (r < 0) |
| return r; |
| |
| if (pd && ir && link->network->dhcp6_force_pd_other_information) { |
| log_link_debug(link, "Enabling managed mode to request DHCPv6 PD with 'Other Information' set"); |
| |
| r = sd_dhcp6_client_set_address_request(link->dhcp6_client, false); |
| if (r < 0) |
| return r; |
| |
| ir = false; |
| } |
| |
| if (running) { |
| r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req); |
| if (r < 0) |
| return r; |
| |
| if (inf_req == ir) |
| return 0; |
| |
| r = sd_dhcp6_client_stop(link->dhcp6_client); |
| if (r < 0) |
| return r; |
| } else { |
| r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address); |
| if (r < 0) |
| return r; |
| } |
| |
| r = sd_dhcp6_client_set_information_request(link->dhcp6_client, ir); |
| if (r < 0) |
| return r; |
| |
| r = sd_dhcp6_client_start(link->dhcp6_client); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int dhcp6_start(Link *link) { |
| assert(link); |
| |
| if (!link->dhcp6_client) |
| return 0; |
| |
| if (!link_dhcp6_enabled(link)) |
| return 0; |
| |
| if (link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_NO) |
| return 0; |
| |
| if (!in6_addr_is_link_local(&link->ipv6ll_address)) { |
| log_link_debug(link, "IPv6 link-local address is not set, delaying to start DHCPv6 client."); |
| return 0; |
| } |
| |
| if (sd_dhcp6_client_is_running(link->dhcp6_client) > 0) |
| return 0; |
| |
| log_link_debug(link, "Acquiring DHCPv6 lease"); |
| |
| return dhcp6_request_information(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST); |
| } |
| |
| int dhcp6_request_prefix_delegation(Link *link) { |
| Link *l; |
| |
| assert(link); |
| assert(link->manager); |
| |
| if (!link_dhcp6_pd_is_enabled(link)) |
| return 0; |
| |
| log_link_debug(link, "Requesting DHCPv6 prefixes to be delegated for new link"); |
| |
| HASHMAP_FOREACH(l, link->manager->links_by_index) { |
| int r, enabled; |
| |
| if (l == link) |
| continue; |
| |
| if (!l->dhcp6_client) |
| continue; |
| |
| r = sd_dhcp6_client_get_prefix_delegation(l->dhcp6_client, &enabled); |
| if (r < 0) { |
| log_link_warning_errno(l, r, "Cannot get prefix delegation when adding new link: %m"); |
| link_enter_failed(l); |
| continue; |
| } |
| |
| if (enabled == 0) { |
| r = sd_dhcp6_client_set_prefix_delegation(l->dhcp6_client, 1); |
| if (r < 0) { |
| log_link_warning_errno(l, r, "Cannot enable prefix delegation when adding new link: %m"); |
| link_enter_failed(l); |
| continue; |
| } |
| } |
| |
| r = sd_dhcp6_client_is_running(l->dhcp6_client); |
| if (r <= 0) |
| continue; |
| |
| if (enabled != 0) { |
| if (dhcp6_lease_has_pd_prefix(l->dhcp6_lease)) { |
| log_link_debug(l, "Requesting re-assignment of delegated prefixes after adding new link"); |
| r = dhcp6_pd_prefix_acquired(l); |
| if (r < 0) |
| link_enter_failed(l); |
| } |
| continue; |
| } |
| |
| r = sd_dhcp6_client_stop(l->dhcp6_client); |
| if (r < 0) { |
| log_link_warning_errno(l, r, "Cannot stop DHCPv6 prefix delegation client after adding new link: %m"); |
| link_enter_failed(l); |
| continue; |
| } |
| |
| r = sd_dhcp6_client_start(l->dhcp6_client); |
| if (r < 0) { |
| log_link_warning_errno(l, r, "Cannot restart DHCPv6 prefix delegation client after adding new link: %m"); |
| link_enter_failed(l); |
| continue; |
| } |
| |
| log_link_debug(l, "Restarted DHCPv6 client to acquire prefix delegations after adding new link"); |
| } |
| |
| /* dhcp6_pd_prefix_acquired() may make the link in failed state. */ |
| if (link->state == LINK_STATE_FAILED) |
| return -ENOANO; |
| |
| return 0; |
| } |
| |
| static int dhcp6_set_hostname(sd_dhcp6_client *client, Link *link) { |
| _cleanup_free_ char *hostname = NULL; |
| const char *hn; |
| int r; |
| |
| assert(link); |
| |
| if (!link->network->dhcp_send_hostname) |
| hn = NULL; |
| else if (link->network->dhcp_hostname) |
| hn = link->network->dhcp_hostname; |
| else { |
| r = gethostname_strict(&hostname); |
| if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */ |
| return r; |
| |
| hn = hostname; |
| } |
| |
| r = sd_dhcp6_client_set_fqdn(client, hn); |
| if (r == -EINVAL && hostname) |
| /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */ |
| log_link_warning_errno(link, r, "DHCP6 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m"); |
| else if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set hostname: %m"); |
| |
| return 0; |
| } |
| |
| static bool dhcp6_enable_prefix_delegation(Link *dhcp6_link) { |
| Link *link; |
| |
| assert(dhcp6_link); |
| assert(dhcp6_link->manager); |
| |
| HASHMAP_FOREACH(link, dhcp6_link->manager->links_by_index) { |
| if (link == dhcp6_link) |
| continue; |
| |
| if (!link_dhcp6_pd_is_enabled(link)) |
| continue; |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static int dhcp6_set_identifier(Link *link, sd_dhcp6_client *client) { |
| const DUID *duid; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(client); |
| |
| r = sd_dhcp6_client_set_mac(client, link->hw_addr.bytes, link->hw_addr.length, link->iftype); |
| if (r < 0) |
| return r; |
| |
| if (link->network->dhcp6_iaid_set) { |
| r = sd_dhcp6_client_set_iaid(client, link->network->dhcp6_iaid); |
| if (r < 0) |
| return r; |
| } |
| |
| duid = link_get_dhcp6_duid(link); |
| if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0) |
| r = sd_dhcp6_client_set_duid_llt(client, duid->llt_time); |
| else |
| r = sd_dhcp6_client_set_duid(client, |
| duid->type, |
| duid->raw_data_len > 0 ? duid->raw_data : NULL, |
| duid->raw_data_len); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int dhcp6_configure(Link *link) { |
| _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; |
| sd_dhcp6_option *vendor_option; |
| sd_dhcp6_option *send_option; |
| void *request_options; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if (!link_dhcp6_enabled(link) && !link_ipv6_accept_ra_enabled(link)) |
| return 0; |
| |
| if (link->dhcp6_client) |
| return -EBUSY; |
| |
| r = dhcp_configure_duid(link, link_get_dhcp6_duid(link)); |
| if (r <= 0) |
| return r; |
| |
| r = sd_dhcp6_client_new(&client); |
| if (r == -ENOMEM) |
| return log_oom(); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to create DHCP6 client: %m"); |
| |
| r = sd_dhcp6_client_attach_event(client, link->manager->event, 0); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to attach event: %m"); |
| |
| r = dhcp6_set_identifier(link, client); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set identifier: %m"); |
| |
| ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp6_client_send_options) { |
| r = sd_dhcp6_client_add_option(client, send_option); |
| if (r == -EEXIST) |
| continue; |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set option: %m"); |
| } |
| |
| r = dhcp6_set_hostname(client, link); |
| if (r < 0) |
| return r; |
| |
| r = sd_dhcp6_client_set_ifindex(client, link->ifindex); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set ifindex: %m"); |
| |
| if (link->network->dhcp6_rapid_commit) { |
| r = sd_dhcp6_client_set_request_option(client, SD_DHCP6_OPTION_RAPID_COMMIT); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set request flag for rapid commit: %m"); |
| } |
| |
| if (link->network->dhcp6_mudurl) { |
| r = sd_dhcp6_client_set_request_mud_url(client, link->network->dhcp6_mudurl); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set MUD URL: %m"); |
| } |
| |
| SET_FOREACH(request_options, link->network->dhcp6_request_options) { |
| uint32_t option = PTR_TO_UINT32(request_options); |
| |
| r = sd_dhcp6_client_set_request_option(client, option); |
| if (r == -EEXIST) { |
| log_link_debug(link, "DHCP6 CLIENT: Failed to set request flag for '%u' already exists, ignoring.", option); |
| continue; |
| } |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set request flag for '%u': %m", option); |
| } |
| |
| if (link->network->dhcp6_user_class) { |
| r = sd_dhcp6_client_set_request_user_class(client, link->network->dhcp6_user_class); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set user class: %m"); |
| } |
| |
| if (link->network->dhcp6_vendor_class) { |
| r = sd_dhcp6_client_set_request_vendor_class(client, link->network->dhcp6_vendor_class); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set vendor class: %m"); |
| } |
| |
| ORDERED_HASHMAP_FOREACH(vendor_option, link->network->dhcp6_client_send_vendor_options) { |
| r = sd_dhcp6_client_add_vendor_option(client, vendor_option); |
| if (r == -EEXIST) |
| continue; |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set vendor option: %m"); |
| } |
| |
| r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set callback: %m"); |
| |
| if (dhcp6_enable_prefix_delegation(link)) { |
| r = sd_dhcp6_client_set_prefix_delegation(client, true); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set prefix delegation: %m"); |
| } |
| |
| if (link->network->dhcp6_pd_length > 0) { |
| r = sd_dhcp6_client_set_prefix_delegation_hint(client, link->network->dhcp6_pd_length, &link->network->dhcp6_pd_address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set prefix hint: %m"); |
| } |
| |
| link->dhcp6_client = TAKE_PTR(client); |
| |
| return 0; |
| } |
| |
| int dhcp6_update_mac(Link *link) { |
| bool restart; |
| int r; |
| |
| assert(link); |
| |
| if (!link->dhcp6_client) |
| return 0; |
| |
| restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0; |
| |
| if (restart) { |
| r = sd_dhcp6_client_stop(link->dhcp6_client); |
| if (r < 0) |
| return r; |
| } |
| |
| r = dhcp6_set_identifier(link, link->dhcp6_client); |
| if (r < 0) |
| return r; |
| |
| if (restart) { |
| r = sd_dhcp6_client_start(link->dhcp6_client); |
| if (r < 0) |
| return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m"); |
| } |
| |
| return 0; |
| } |
| |
| int link_serialize_dhcp6_client(Link *link, FILE *f) { |
| _cleanup_free_ char *duid = NULL; |
| uint32_t iaid; |
| int r; |
| |
| assert(link); |
| |
| if (!link->dhcp6_client) |
| return 0; |
| |
| r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid); |
| if (r >= 0) |
| fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid); |
| |
| r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid); |
| if (r >= 0) |
| fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid); |
| |
| return 0; |
| } |
| |
| int config_parse_dhcp6_pd_hint( |
| 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) { |
| |
| Network *network = data; |
| union in_addr_union u; |
| unsigned char prefixlen; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| r = in_addr_prefix_from_string(rvalue, AF_INET6, &u, &prefixlen); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to parse %s=%s, ignoring assignment.", lvalue, rvalue); |
| return 0; |
| } |
| |
| if (prefixlen < 1 || prefixlen > 128) { |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "Invalid prefix length in %s=%s, ignoring assignment.", lvalue, rvalue); |
| return 0; |
| } |
| |
| network->dhcp6_pd_address = u.in6; |
| network->dhcp6_pd_length = prefixlen; |
| |
| return 0; |
| } |
| |
| int config_parse_dhcp6_mud_url( |
| 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) { |
| |
| _cleanup_free_ char *unescaped = NULL; |
| Network *network = data; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| |
| if (isempty(rvalue)) { |
| network->dhcp6_mudurl = mfree(network->dhcp6_mudurl); |
| return 0; |
| } |
| |
| r = cunescape(rvalue, 0, &unescaped); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to Failed to unescape MUD URL, ignoring: %s", rvalue); |
| return 0; |
| } |
| |
| if (!http_url_is_valid(unescaped) || strlen(unescaped) > UINT8_MAX) { |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "Failed to parse MUD URL '%s', ignoring: %m", rvalue); |
| return 0; |
| } |
| |
| return free_and_replace(network->dhcp6_mudurl, unescaped); |
| } |
| |
| DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp6_client_start_mode, dhcp6_client_start_mode, DHCP6ClientStartMode, |
| "Failed to parse WithoutRA= setting"); |
| |
| static const char* const dhcp6_client_start_mode_table[_DHCP6_CLIENT_START_MODE_MAX] = { |
| [DHCP6_CLIENT_START_MODE_NO] = "no", |
| [DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST] = "information-request", |
| [DHCP6_CLIENT_START_MODE_SOLICIT] = "solicit", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(dhcp6_client_start_mode, DHCP6ClientStartMode); |
| |
| int config_parse_dhcp6_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 = data; |
| uint64_t t; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| 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; |
| } |
