| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| /*** |
| Copyright © 2014 Intel Corporation. All rights reserved. |
| ***/ |
| |
| #include <netinet/ether.h> |
| #include <linux/if.h> |
| #include "sd-radv.h" |
| |
| #include "sd-dhcp6-client.h" |
| |
| #include "hashmap.h" |
| #include "hostname-util.h" |
| #include "network-internal.h" |
| #include "networkd-link.h" |
| #include "networkd-manager.h" |
| #include "siphash24.h" |
| #include "string-util.h" |
| #include "radv-internal.h" |
| |
| static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link); |
| |
| static bool dhcp6_get_prefix_delegation(Link *link) { |
| if (!link->network) |
| return false; |
| |
| return IN_SET(link->network->router_prefix_delegation, |
| RADV_PREFIX_DELEGATION_DHCP6, |
| RADV_PREFIX_DELEGATION_BOTH); |
| } |
| |
| static bool dhcp6_enable_prefix_delegation(Link *dhcp6_link) { |
| Manager *manager; |
| Link *l; |
| Iterator i; |
| |
| assert(dhcp6_link); |
| |
| manager = dhcp6_link->manager; |
| assert(manager); |
| |
| HASHMAP_FOREACH(l, manager->links, i) { |
| if (l == dhcp6_link) |
| continue; |
| |
| if (!dhcp6_get_prefix_delegation(l)) |
| continue; |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static int dhcp6_lease_information_acquired(sd_dhcp6_client *client, |
| Link *link) { |
| return 0; |
| } |
| |
| static int dhcp6_pd_prefix_assign(Link *link, struct in6_addr *prefix, |
| uint8_t prefix_len, |
| uint32_t lifetime_preferred, |
| uint32_t lifetime_valid) { |
| sd_radv *radv = link->radv; |
| int r; |
| _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; |
| |
| r = sd_radv_prefix_new(&p); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_prefix_set_prefix(p, prefix, prefix_len); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_stop(radv); |
| if (r < 0) |
| return r; |
| |
| r = sd_radv_add_prefix(radv, p, true); |
| if (r < 0 && r != -EEXIST) |
| return r; |
| |
| r = manager_dhcp6_prefix_add(link->manager, &p->opt.in6_addr, link); |
| if (r < 0) |
| return r; |
| |
| return sd_radv_start(radv); |
| } |
| |
| static int dhcp6_route_remove_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| |
| r = sd_netlink_message_get_errno(m); |
| if (r < 0) |
| log_link_debug_errno(link, r, "Received error on unreachable route removal for DHCPv6 delegated subnetl: %m"); |
| |
| return 1; |
| } |
| |
| int dhcp6_lease_pd_prefix_lost(sd_dhcp6_client *client, Link* link) { |
| int r; |
| sd_dhcp6_lease *lease; |
| union in_addr_union pd_prefix; |
| uint8_t pd_prefix_len; |
| uint32_t lifetime_preferred, lifetime_valid; |
| |
| r = sd_dhcp6_client_get_lease(client, &lease); |
| if (r < 0) |
| return r; |
| |
| sd_dhcp6_lease_reset_pd_prefix_iter(lease); |
| |
| while (sd_dhcp6_lease_get_pd(lease, &pd_prefix.in6, &pd_prefix_len, |
| &lifetime_preferred, |
| &lifetime_valid) >= 0) { |
| _cleanup_free_ char *buf = NULL; |
| _cleanup_free_ Route *route = NULL; |
| |
| if (pd_prefix_len > 64) |
| continue; |
| |
| (void) in_addr_to_string(AF_INET6, &pd_prefix, &buf); |
| |
| if (pd_prefix_len < 64) { |
| r = route_new(&route); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "Cannot create unreachable route to delete for DHCPv6 delegated subnet %s/%u: %m", |
| strnull(buf), |
| pd_prefix_len); |
| continue; |
| } |
| |
| route_add(link, AF_INET6, &pd_prefix, pd_prefix_len, |
| 0, 0, 0, &route); |
| route_update(route, NULL, 0, NULL, NULL, 0, 0, |
| RTN_UNREACHABLE); |
| |
| r = route_remove(route, link, dhcp6_route_remove_handler); |
| if (r < 0) { |
| (void) in_addr_to_string(AF_INET6, |
| &pd_prefix, &buf); |
| |
| log_link_warning_errno(link, r, "Cannot delete unreachable route for DHCPv6 delegated subnet %s/%u: %m", |
| strnull(buf), |
| pd_prefix_len); |
| |
| continue; |
| } |
| |
| log_link_debug(link, "Removing unreachable route %s/%u", |
| strnull(buf), pd_prefix_len); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int dhcp6_pd_prefix_distribute(Link *dhcp6_link, Iterator *i, |
| struct in6_addr *pd_prefix, |
| uint8_t pd_prefix_len, |
| uint32_t lifetime_preferred, |
| uint32_t lifetime_valid) { |
| Link *link; |
| Manager *manager = dhcp6_link->manager; |
| union in_addr_union prefix; |
| uint64_t n_prefixes, n_used = 0; |
| _cleanup_free_ char *buf = NULL; |
| _cleanup_free_ char *assigned_buf = NULL; |
| int r; |
| |
| assert(manager); |
| assert(pd_prefix_len <= 64); |
| |
| prefix.in6 = *pd_prefix; |
| |
| r = in_addr_mask(AF_INET6, &prefix, pd_prefix_len); |
| if (r < 0) |
| return r; |
| |
| n_prefixes = UINT64_C(1) << (64 - pd_prefix_len); |
| |
| (void) in_addr_to_string(AF_INET6, &prefix, &buf); |
| log_link_debug(dhcp6_link, "Assigning up to %" PRIu64 " prefixes from %s/%u", |
| n_prefixes, strnull(buf), pd_prefix_len); |
| |
| while (hashmap_iterate(manager->links, i, (void **)&link, NULL)) { |
| Link *assigned_link; |
| |
| if (n_used == n_prefixes) { |
| log_link_debug(dhcp6_link, "Assigned %" PRIu64 "/%" PRIu64 " prefixes from %s/%u", |
| n_used, n_prefixes, strnull(buf), pd_prefix_len); |
| |
| return -EAGAIN; |
| } |
| |
| if (link == dhcp6_link) |
| continue; |
| |
| if (!dhcp6_get_prefix_delegation(link)) |
| continue; |
| |
| assigned_link = manager_dhcp6_prefix_get(manager, &prefix.in6); |
| if (assigned_link != NULL && assigned_link != link) |
| continue; |
| |
| (void) in_addr_to_string(AF_INET6, &prefix, &assigned_buf); |
| r = dhcp6_pd_prefix_assign(link, &prefix.in6, 64, |
| lifetime_preferred, lifetime_valid); |
| if (r < 0) { |
| log_link_error_errno(link, r, "Unable to %s prefix %s/64 from %s/%u for link: %m", |
| assigned_link ? "update": "assign", |
| strnull(assigned_buf), |
| strnull(buf), pd_prefix_len); |
| |
| if (assigned_link == NULL) |
| continue; |
| |
| } else |
| log_link_debug(link, "Assigned prefix %" PRIu64 "/%" PRIu64 " %s/64 from %s/%u to link", |
| n_used + 1, n_prefixes, |
| strnull(assigned_buf), |
| strnull(buf), pd_prefix_len); |
| |
| n_used++; |
| |
| r = in_addr_prefix_next(AF_INET6, &prefix, 64); |
| if (r < 0 && n_used < n_prefixes) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int dhcp6_route_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| |
| r = sd_netlink_message_get_errno(m); |
| if (r < 0 && r != -EEXIST) |
| log_link_debug_errno(link, r, "Received error when adding unreachable route for DHCPv6 delegated subnet: %m"); |
| |
| return 1; |
| } |
| |
| static int dhcp6_lease_pd_prefix_acquired(sd_dhcp6_client *client, Link *link) { |
| int r; |
| sd_dhcp6_lease *lease; |
| union in_addr_union pd_prefix; |
| uint8_t pd_prefix_len; |
| uint32_t lifetime_preferred, lifetime_valid; |
| _cleanup_free_ char *buf = NULL; |
| Iterator i = ITERATOR_FIRST; |
| |
| r = sd_dhcp6_client_get_lease(client, &lease); |
| if (r < 0) |
| return r; |
| |
| sd_dhcp6_lease_reset_pd_prefix_iter(lease); |
| |
| while (sd_dhcp6_lease_get_pd(lease, &pd_prefix.in6, &pd_prefix_len, |
| &lifetime_preferred, |
| &lifetime_valid) >= 0) { |
| |
| if (pd_prefix_len > 64) { |
| (void) in_addr_to_string(AF_INET6, &pd_prefix, &buf); |
| log_link_debug(link, "PD Prefix length > 64, ignoring prefix %s/%u", |
| strnull(buf), pd_prefix_len); |
| continue; |
| } |
| |
| if (pd_prefix_len < 48) { |
| (void) in_addr_to_string(AF_INET6, &pd_prefix, &buf); |
| log_link_warning(link, "PD Prefix length < 48, looks unusual %s/%u", |
| strnull(buf), pd_prefix_len); |
| } |
| |
| if (pd_prefix_len < 64) { |
| Route *route = NULL; |
| |
| (void) in_addr_to_string(AF_INET6, &pd_prefix, &buf); |
| |
| r = route_new(&route); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "Cannot create unreachable route for DHCPv6 delegated subnet %s/%u: %m", |
| strnull(buf), |
| pd_prefix_len); |
| continue; |
| } |
| |
| route_add(link, AF_INET6, &pd_prefix, pd_prefix_len, |
| 0, 0, 0, &route); |
| route_update(route, NULL, 0, NULL, NULL, 0, 0, |
| RTN_UNREACHABLE); |
| |
| r = route_configure(route, link, dhcp6_route_handler); |
| if (r < 0) { |
| log_link_warning_errno(link, r, "Cannot configure unreachable route for delegated subnet %s/%u: %m", |
| strnull(buf), |
| pd_prefix_len); |
| route_free(route); |
| continue; |
| } |
| |
| route_free(route); |
| |
| log_link_debug(link, "Configuring unreachable route for %s/%u", |
| strnull(buf), pd_prefix_len); |
| |
| } else |
| log_link_debug(link, "Not adding a blocking route since distributed prefix is /64"); |
| |
| r = dhcp6_pd_prefix_distribute(link, &i, &pd_prefix.in6, |
| pd_prefix_len, |
| lifetime_preferred, |
| lifetime_valid); |
| if (r < 0 && r != -EAGAIN) |
| return r; |
| |
| if (r >= 0) |
| i = ITERATOR_FIRST; |
| } |
| |
| return 0; |
| } |
| |
| int dhcp6_request_prefix_delegation(Link *link) { |
| Link *l; |
| Iterator i; |
| |
| assert_return(link, -EINVAL); |
| assert_return(link->manager, -EOPNOTSUPP); |
| |
| if (dhcp6_get_prefix_delegation(link) <= 0) |
| return 0; |
| |
| log_link_debug(link, "Requesting DHCPv6 prefixes to be delegated for new link"); |
| |
| HASHMAP_FOREACH(l, link->manager->links, i) { |
| 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"); |
| 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"); |
| continue; |
| } |
| } |
| |
| r = sd_dhcp6_client_is_running(l->dhcp6_client); |
| if (r <= 0) |
| continue; |
| |
| if (enabled != 0) { |
| log_link_debug(l, "Requesting re-assignment of delegated prefixes after adding new link"); |
| (void) dhcp6_lease_pd_prefix_acquired(l->dhcp6_client, 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"); |
| 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"); |
| continue; |
| } |
| |
| log_link_debug(l, "Restarted DHCPv6 client to acquire prefix delegations after adding new link"); |
| } |
| |
| return 0; |
| } |
| |
| static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| |
| r = sd_netlink_message_get_errno(m); |
| if (r < 0 && r != -EEXIST) { |
| if (link->rtnl_extended_attrs) { |
| log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism"); |
| |
| link->rtnl_extended_attrs = false; |
| dhcp6_lease_address_acquired(link->dhcp6_client, link); |
| |
| return 1; |
| } |
| |
| log_link_error_errno(link, r, "Could not set DHCPv6 address: %m"); |
| |
| link_enter_failed(link); |
| |
| } else if (r >= 0) |
| manager_rtnl_process_address(rtnl, m, link->manager); |
| |
| return 1; |
| } |
| |
| static int dhcp6_address_change( |
| Link *link, |
| struct in6_addr *ip6_addr, |
| uint32_t lifetime_preferred, |
| uint32_t lifetime_valid) { |
| |
| _cleanup_(address_freep) Address *addr = NULL; |
| char buffer[INET6_ADDRSTRLEN]; |
| int r; |
| |
| r = address_new(&addr); |
| if (r < 0) |
| return r; |
| |
| addr->family = AF_INET6; |
| memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr)); |
| |
| addr->flags = IFA_F_NOPREFIXROUTE; |
| addr->prefixlen = 128; |
| |
| addr->cinfo.ifa_prefered = lifetime_preferred; |
| addr->cinfo.ifa_valid = lifetime_valid; |
| |
| log_link_info(link, |
| "DHCPv6 address %s/%d timeout preferred %d valid %d", |
| inet_ntop(AF_INET6, &addr->in_addr.in6, buffer, sizeof(buffer)), |
| addr->prefixlen, lifetime_preferred, lifetime_valid); |
| |
| r = address_configure(addr, link, dhcp6_address_handler, true); |
| if (r < 0) |
| log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m"); |
| |
| return r; |
| } |
| |
| static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) { |
| int r; |
| sd_dhcp6_lease *lease; |
| struct in6_addr ip6_addr; |
| uint32_t lifetime_preferred, lifetime_valid; |
| |
| r = sd_dhcp6_client_get_lease(client, &lease); |
| if (r < 0) |
| return r; |
| |
| sd_dhcp6_lease_reset_address_iter(lease); |
| |
| while (sd_dhcp6_lease_get_address(lease, &ip6_addr, |
| &lifetime_preferred, |
| &lifetime_valid) >= 0) { |
| |
| r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) { |
| int r; |
| Link *link = userdata; |
| |
| 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: |
| if (sd_dhcp6_client_get_lease(client, NULL) >= 0) |
| log_link_warning(link, "DHCPv6 lease lost"); |
| |
| (void) dhcp6_lease_pd_prefix_lost(client, link); |
| (void) manager_dhcp6_prefix_remove_all(link->manager, link); |
| |
| link->dhcp6_configured = false; |
| break; |
| |
| case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE: |
| r = dhcp6_lease_address_acquired(client, link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| |
| r = dhcp6_lease_pd_prefix_acquired(client, link); |
| if (r < 0) |
| log_link_debug(link, "DHCPv6 did not receive prefixes to delegate"); |
| |
| _fallthrough_; |
| case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST: |
| r = dhcp6_lease_information_acquired(client, link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| |
| link->dhcp6_configured = true; |
| 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; |
| } |
| |
| link_check_ready(link); |
| } |
| |
| int dhcp6_request_address(Link *link, int ir) { |
| int r, inf_req, pd; |
| bool running; |
| |
| assert(link); |
| assert(link->dhcp6_client); |
| assert(link->network); |
| assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0); |
| |
| r = sd_dhcp6_client_is_running(link->dhcp6_client); |
| if (r < 0) |
| return r; |
| else |
| 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; |
| } |
| |
| 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; |
| } |
| |
| int dhcp6_configure(Link *link) { |
| _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; |
| const DUID *duid; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if (link->dhcp6_client) |
| return 0; |
| |
| 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, NULL, 0); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to attach event: %m"); |
| |
| r = sd_dhcp6_client_set_mac(client, |
| (const uint8_t *) &link->mac, |
| sizeof (link->mac), ARPHRD_ETHER); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set MAC address: %m"); |
| |
| if (link->network->iaid_set) { |
| r = sd_dhcp6_client_set_iaid(client, link->network->iaid); |
| if (r < 0) |
| return log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set IAID: %m"); |
| } |
| |
| duid = link_get_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 log_link_error_errno(link, r, "DHCP6 CLIENT: Failed to set DUID: %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->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"); |
| } |
| |
| 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"); |
| } |
| |
| link->dhcp6_client = TAKE_PTR(client); |
| |
| return 0; |
| } |