/* SPDX-License-Identifier: LGPL-2.1+ */ /*** Copyright © 2014 Intel Corporation. All rights reserved. ***/ #include #include #include #include "sd-dhcp6-client.h" #include "escape.h" #include "hashmap.h" #include "hostname-util.h" #include "missing_network.h" #include "network-internal.h" #include "networkd-dhcp6.h" #include "networkd-link.h" #include "networkd-manager.h" #include "networkd-radv.h" #include "siphash24.h" #include "string-table.h" #include "string-util.h" #include "radv-internal.h" #include "web-util.h" static Link *dhcp6_prefix_get(Manager *m, struct in6_addr *addr); static int dhcp6_prefix_add(Manager *m, struct in6_addr *addr, Link *link); static int dhcp6_prefix_remove_all(Manager *m, Link *link); static int dhcp6_assign_delegated_prefix(Link *link, const struct in6_addr *prefix, uint8_t prefix_len, uint32_t lifetime_preferred, uint32_t lifetime_valid); 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_has_preferred_subnet_id(Link *link) { if (!link->network) return false; return link->network->router_prefix_subnet_id >= 0; } static int dhcp6_get_preferred_delegated_prefix( Manager* manager, Link *link, const struct in6_addr *pd_prefix, uint8_t pd_prefix_len, struct in6_addr *ret_addr) { int64_t subnet_id = link->network->router_prefix_subnet_id; uint8_t prefix_bits = 64 - pd_prefix_len; uint64_t n_prefixes = UINT64_C(1) << prefix_bits; _cleanup_free_ char *assigned_buf = NULL; union in_addr_union pd_prefix_union = { .in6 = *pd_prefix, }; /* We start off with the original PD prefix we have been assigned and * iterate from there */ union in_addr_union prefix = { .in6 = *pd_prefix, }; int r; assert(pd_prefix_len <= 64); assert(manager); assert(link); assert(link->network); if (subnet_id >= 0) { /* If the link has a preference for a particular subnet id try to allocate that */ if ((uint64_t) subnet_id >= n_prefixes) return log_link_debug_errno(link, SYNTHETIC_ERRNO(ERANGE), "subnet id %" PRIi64 " 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_debug_errno(link, r, "subnet id %" PRIi64 " 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, &pd_prefix_union, pd_prefix_len, &prefix) > 0); Link* assigned_link = dhcp6_prefix_get(manager, &prefix.in6); (void) in_addr_to_string(AF_INET6, &prefix, &assigned_buf); if (assigned_link && assigned_link != link) return log_link_error_errno(link, SYNTHETIC_ERRNO(EAGAIN), "The requested prefix %s is already assigned to another link: %s", strnull(assigned_buf), strnull(assigned_link->ifname)); *ret_addr = prefix.in6; log_link_debug(link, "The requested prefix %s is available. Using it.", strnull(assigned_buf)); 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. */ Link* assigned_link = dhcp6_prefix_get(manager, &prefix.in6); if (!assigned_link || assigned_link == link) { *ret_addr = prefix.in6; return 0; } r = in_addr_prefix_next(AF_INET6, &prefix, 64); if (r < 0) return log_link_error_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 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) { int r; r = radv_add_prefix(link, prefix, prefix_len, lifetime_preferred, lifetime_valid); if (r < 0) return r; r = dhcp6_prefix_add(link->manager, prefix, link); if (r < 0) return r; r = dhcp6_assign_delegated_prefix(link, prefix, prefix_len, lifetime_preferred, lifetime_valid); if (r < 0) return r; return 0; } static int dhcp6_route_remove_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) { int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Received error on unreachable route removal for DHCPv6 delegated subnet"); return 1; } int dhcp6_lease_pd_prefix_lost(sd_dhcp6_client *client, Link* link) { uint32_t lifetime_preferred, lifetime_valid; union in_addr_union pd_prefix; uint8_t pd_prefix_len; sd_dhcp6_lease *lease; int r; 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_(route_freep) Route *route = NULL; if (pd_prefix_len >= 64) continue; (void) in_addr_to_string(AF_INET6, &pd_prefix, &buf); r = route_new(&route); if (r < 0) return r; route->family = AF_INET6; route->dst = pd_prefix; route->dst_prefixlen = pd_prefix_len; route->type = RTN_UNREACHABLE; r = route_remove(route, link, dhcp6_route_remove_handler); if (r < 0) { 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, struct in6_addr *pd_prefix, uint8_t pd_prefix_len, uint32_t lifetime_preferred, uint32_t lifetime_valid, bool assign_preferred_subnet_id) { _cleanup_free_ char *assigned_buf = NULL, *buf = NULL; Manager *manager = dhcp6_link->manager; union in_addr_union prefix = { .in6 = *pd_prefix, }; bool pool_depleted = false; uint64_t n_prefixes; Iterator i; Link *link; int r; assert(manager); assert(pd_prefix_len <= 64); 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); HASHMAP_FOREACH(link, manager->links, i) { union in_addr_union assigned_prefix; if (link == dhcp6_link) continue; if (!dhcp6_get_prefix_delegation(link)) continue; if (assign_preferred_subnet_id != dhcp6_has_preferred_subnet_id(link)) continue; r = dhcp6_get_preferred_delegated_prefix(manager, link, &prefix.in6, pd_prefix_len, &assigned_prefix.in6); if (assign_preferred_subnet_id && r == -EAGAIN) { /* A link has a preferred subnet_id but that one is * already taken by another link. Now all the remaining * links will also not obtain a prefix. */ pool_depleted = true; continue; } else if (r < 0) return r; (void) in_addr_to_string(AF_INET6, &assigned_prefix, &assigned_buf); r = dhcp6_pd_prefix_assign(link, &assigned_prefix.in6, 64, lifetime_preferred, lifetime_valid); if (r < 0) { log_link_error_errno(link, r, "Unable to assign/update prefix %s/64 from %s/%u for link: %m", strnull(assigned_buf), strnull(buf), pd_prefix_len); } else log_link_debug(link, "Assigned prefix %s/64 from %s/%u to link", strnull(assigned_buf), strnull(buf), pd_prefix_len); } /* If one of the link requests couldn't be fulfilled, signal that we should try again with another prefix. */ if (pool_depleted) return -EAGAIN; return 0; } static int dhcp6_route_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) { int r; assert(link); assert(link->dhcp6_route_messages > 0); link->dhcp6_route_messages--; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, "Failed to add unreachable route for DHCPv6 delegated subnet"); link_enter_failed(link); return 1; } if (link->dhcp6_route_messages == 0) { log_link_debug(link, "Unreachable routes for DHCPv6 delegated subnets set"); link->dhcp6_route_configured = true; link_check_ready(link); } return 1; } static int dhcp6_lease_pd_prefix_acquired(sd_dhcp6_client *client, Link *link) { uint32_t lifetime_preferred, lifetime_valid; union in_addr_union pd_prefix; sd_dhcp6_lease *lease; uint8_t pd_prefix_len; int r; link->dhcp6_route_configured = false; 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; (void) in_addr_to_string(AF_INET6, &pd_prefix, &buf); if (pd_prefix_len > 64) { log_link_debug(link, "PD Prefix length > 64, ignoring prefix %s/%u", strnull(buf), pd_prefix_len); continue; } if (pd_prefix_len < 48) log_link_warning(link, "PD Prefix length < 48, looks unusual %s/%u", strnull(buf), pd_prefix_len); if (pd_prefix_len < 64) { _cleanup_(route_freep) Route *route = NULL; r = route_new(&route); if (r < 0) return r; route->family = AF_INET6; route->dst = pd_prefix; route->dst_prefixlen = pd_prefix_len; route->table = link_get_dhcp_route_table(link); route->type = 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); continue; } if (r > 0) link->dhcp6_route_messages++; 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"); /* 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. * If a subnet id request couldn't be fulfilled the failure will be logged (as error) * and no further attempts at obtaining a prefix will be made. * 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. */ r = dhcp6_pd_prefix_distribute(link, &pd_prefix.in6, pd_prefix_len, lifetime_preferred, lifetime_valid, true); if (r < 0 && r != -EAGAIN) return r; /* if r == -EAGAIN then the allocation failed because we ran * out of addresses for the preferred subnet id's. This doesn't * mean we can't fulfill other prefix requests. * * Since we do not have dedicated lists of links that request * specific subnet id's and those that accept any prefix we * *must* reset the iterator to the start as otherwise some * links might not get their requested prefix. */ r = dhcp6_pd_prefix_distribute(link, &pd_prefix.in6, pd_prefix_len, lifetime_preferred, lifetime_valid, false); if (r < 0 && r != -EAGAIN) return r; /* If the prefix distribution did return -EAGAIN we will try to * fulfill those with the next available pd delegated prefix. */ } if (link->dhcp6_route_messages == 0) { link->dhcp6_route_configured = true; link_check_ready(link); } else { log_link_debug(link, "Setting unreachable routes for DHCPv6 delegated subnets"); link_set_state(link, LINK_STATE_CONFIGURING); } 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: %m"); 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: 5m"); 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: %m"); 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"); 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); assert(link->dhcp6_address_messages > 0); link->dhcp6_address_messages--; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, "Could not set DHCPv6 address"); link_enter_failed(link); return 1; } else if (r >= 0) (void) manager_rtnl_process_address(rtnl, m, link->manager); if (link->dhcp6_address_messages == 0) { log_link_debug(link, "DHCPv6 addresses set"); link->dhcp6_address_configured = true; r = link_request_set_routes(link); if (r < 0) { link_enter_failed(link); return 1; } } 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; _cleanup_free_ char *buffer = NULL; int r; r = address_new(&addr); if (r < 0) return r; 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; (void) in_addr_to_string(addr->family, &addr->in_addr, &buffer); log_link_info(link, "DHCPv6 address %s/%d timeout preferred %d valid %d", strnull(buffer), addr->prefixlen, lifetime_preferred, lifetime_valid); r = address_configure(addr, link, dhcp6_address_handler, true); if (r < 0) return log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m"); if (r > 0) link->dhcp6_address_messages++; return 0; } 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; link->dhcp6_address_configured = false; 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; } if (link->dhcp6_address_messages == 0) { link->dhcp6_address_configured = true; return link_request_set_routes(link); } else { log_link_debug(link, "Setting DHCPv6 addresses"); /* address_handler calls link_request_set_routes() and link_request_set_nexthop(). * Before they are called, the related flags must be cleared. Otherwise, the link * becomes configured state before routes are configured. */ link->static_routes_configured = false; link->static_nexthops_configured = false; link_set_state(link, LINK_STATE_CONFIGURING); } 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) dhcp6_prefix_remove_all(link->manager, link); link_dirty(link); 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_errno(link, r, "DHCPv6 did not receive prefixes to delegate: %m"); _fallthrough_; case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST: r = dhcp6_lease_information_acquired(client, link); if (r < 0) { link_enter_failed(link); return; } link_dirty(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; } 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; 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; sd_dhcp6_option *vendor_option; sd_dhcp6_option *send_option; void *request_options; const DUID *duid; Iterator i; 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"); ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp6_client_send_options, i) { 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->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, i) { 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, i) { 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; } static Link *dhcp6_prefix_get(Manager *m, struct in6_addr *addr) { assert_return(m, NULL); assert_return(addr, NULL); return hashmap_get(m->dhcp6_prefixes, addr); } static int dhcp6_pd_route_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) { int r; assert(link); assert(link->dhcp6_pd_route_messages > 0); link->dhcp6_pd_route_messages--; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, "Failed to add DHCPv6 Prefix Delegation route"); link_enter_failed(link); return 1; } if (link->dhcp6_pd_route_messages == 0) { log_link_debug(link, "DHCPv6 prefix delegation routes set"); link->dhcp6_pd_route_configured = true; link_check_ready(link); } return 1; } static int dhcp6_prefix_add(Manager *m, struct in6_addr *addr, Link *link) { _cleanup_(route_freep) Route *route = NULL; _cleanup_free_ struct in6_addr *a = NULL; _cleanup_free_ char *buf = NULL; Link *assigned_link; int r; assert_return(m, -EINVAL); assert_return(addr, -EINVAL); r = route_new(&route); if (r < 0) return r; route->family = AF_INET6; route->dst.in6 = *addr; route->dst_prefixlen = 64; link->dhcp6_pd_route_configured = false; link_set_state(link, LINK_STATE_CONFIGURING); r = route_configure(route, link, dhcp6_pd_route_handler); if (r < 0) return r; if (r > 0) link->dhcp6_pd_route_messages++; (void) in_addr_to_string(AF_INET6, (union in_addr_union *) addr, &buf); log_link_debug(link, "Adding prefix route %s/64", strnull(buf)); assigned_link = hashmap_get(m->dhcp6_prefixes, addr); if (assigned_link) { assert(assigned_link == link); return 0; } a = newdup(struct in6_addr, addr, 1); if (!a) return -ENOMEM; r = hashmap_ensure_allocated(&m->dhcp6_prefixes, &in6_addr_hash_ops); if (r < 0) return r; r = hashmap_put(m->dhcp6_prefixes, a, link); if (r < 0) return r; TAKE_PTR(a); link_ref(link); return 0; } static int dhcp6_prefix_remove_handler(sd_netlink *nl, sd_netlink_message *m, Link *link) { int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) { log_link_message_warning_errno(link, m, r, "Received error on DHCPv6 Prefix Delegation route removal"); link_enter_failed(link); return 1; } return 1; } int dhcp6_prefix_remove(Manager *m, struct in6_addr *addr) { _cleanup_free_ struct in6_addr *a = NULL; _cleanup_(link_unrefp) Link *l = NULL; _cleanup_(route_freep) Route *route = NULL; _cleanup_free_ char *buf = NULL; int r; assert_return(m, -EINVAL); assert_return(addr, -EINVAL); l = hashmap_remove2(m->dhcp6_prefixes, addr, (void **) &a); if (!l) return -EINVAL; (void) sd_radv_remove_prefix(l->radv, addr, 64); r = route_new(&route); if (r < 0) return r; route->family = AF_INET6; route->dst.in6 = *addr; route->dst_prefixlen = 64; r = route_remove(route, l, dhcp6_prefix_remove_handler); if (r < 0) return r; (void) in_addr_to_string(AF_INET6, (union in_addr_union *) addr, &buf); log_link_debug(l, "Removing prefix route %s/64", strnull(buf)); return 0; } static int dhcp6_prefix_remove_all(Manager *m, Link *link) { struct in6_addr *addr; Iterator i; Link *l; assert_return(m, -EINVAL); assert_return(link, -EINVAL); HASHMAP_FOREACH_KEY(l, addr, m->dhcp6_prefixes, i) if (l == link) (void) dhcp6_prefix_remove(m, addr); 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--; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, "Could not set DHCPv6 delegated prefix address"); link_enter_failed(link); return 1; } else if (r >= 0) (void) manager_rtnl_process_address(rtnl, m, link->manager); if (link->dhcp6_pd_address_messages == 0) { log_link_debug(link, "DHCPv6 delegated prefix addresses set"); link->dhcp6_pd_address_configured = true; r = link_request_set_routes(link); if (r < 0) { link_enter_failed(link); return 1; } } return 1; } static int dhcp6_assign_delegated_prefix(Link *link, const struct in6_addr *prefix, uint8_t prefix_len, uint32_t lifetime_preferred, uint32_t lifetime_valid) { _cleanup_(address_freep) Address *address = NULL; int r; assert(link); assert(link->network); assert(prefix); if (!link->network->dhcp6_pd_assign_prefix) { link->dhcp6_pd_address_configured = true; 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 (!in_addr_is_null(AF_INET6, &link->network->dhcp6_delegation_prefix_token)) memcpy(address->in_addr.in6.s6_addr + 8, link->network->dhcp6_delegation_prefix_token.in6.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 = prefix_len; address->family = AF_INET6; address->cinfo.ifa_prefered = lifetime_preferred; address->cinfo.ifa_valid = lifetime_valid; /* address_handler calls link_request_set_routes() and link_request_set_nexthop(). Before they * are called, the related flags must be cleared. Otherwise, the link becomes configured state * before routes are configured. */ link->static_routes_configured = false; link->static_nexthops_configured = false; link->dhcp6_pd_address_configured = false; link_set_state(link, LINK_STATE_CONFIGURING); r = address_configure(address, link, dhcp6_pd_address_handler, true); if (r < 0) return log_link_warning_errno(link, r, "Failed to set acquired DHCPv6 delegated prefix address: %m"); if (r > 0) link->dhcp6_pd_address_messages++; 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; int r; assert(filename); assert(lvalue); assert(rvalue); assert(data); r = in_addr_prefix_from_string(rvalue, AF_INET6, (union in_addr_union *) &network->dhcp6_pd_address, &network->dhcp6_pd_length); if (r < 0) { log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse PrefixDelegationHint=%s, ignoring assignment", rvalue); return 0; } if (network->dhcp6_pd_length < 1 || network->dhcp6_pd_length > 128) { log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid prefix length='%d', ignoring assignment", network->dhcp6_pd_length); network->dhcp6_pd_length = 0; return 0; } 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_ERR, 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_ERR, filename, line, 0, "Failed to parse MUD URL '%s', ignoring: %m", rvalue); return 0; } return free_and_replace(network->dhcp6_mudurl, unescaped); } int config_parse_dhcp6_delegated_prefix_token( 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; int r; assert(filename); assert(lvalue); assert(rvalue); assert(data); if (isempty(rvalue)) { network->dhcp6_delegation_prefix_token = IN_ADDR_NULL; return 0; } r = in_addr_from_string(AF_INET6, rvalue, &network->dhcp6_delegation_prefix_token); if (r < 0) { log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse DHCPv6 %s, ignoring: %s", lvalue, rvalue); return 0; } if (in_addr_is_null(AF_INET6, &network->dhcp6_delegation_prefix_token)) { log_syntax(unit, LOG_ERR, filename, line, 0, "DHCPv6 %s cannot be the ANY address, ignoring: %s", lvalue, rvalue); return 0; } return 0; } 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);