| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| /*** |
| Copyright © 2014 Intel Corporation. All rights reserved. |
| ***/ |
| |
| #include <arpa/inet.h> |
| #include <netinet/icmp6.h> |
| #include <net/if_arp.h> |
| #include <linux/if.h> |
| |
| #include "sd-ndisc.h" |
| |
| #include "missing_network.h" |
| #include "networkd-address.h" |
| #include "networkd-dhcp6.h" |
| #include "networkd-manager.h" |
| #include "networkd-ndisc.h" |
| #include "networkd-queue.h" |
| #include "networkd-state-file.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "strv.h" |
| |
| #define NDISC_DNSSL_MAX 64U |
| #define NDISC_RDNSS_MAX 64U |
| |
| #define DAD_CONFLICTS_IDGEN_RETRIES_RFC7217 3 |
| |
| /* https://tools.ietf.org/html/rfc5453 */ |
| /* https://www.iana.org/assignments/ipv6-interface-ids/ipv6-interface-ids.xml */ |
| |
| #define SUBNET_ROUTER_ANYCAST_ADDRESS_RFC4291 ((struct in6_addr) { .s6_addr = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }) |
| #define SUBNET_ROUTER_ANYCAST_PREFIXLEN 8 |
| #define RESERVED_IPV6_INTERFACE_IDENTIFIERS_ADDRESS_RFC4291 ((struct in6_addr) { .s6_addr = { 0x02, 0x00, 0x5E, 0xFF, 0xFE } }) |
| #define RESERVED_IPV6_INTERFACE_IDENTIFIERS_PREFIXLEN 5 |
| #define RESERVED_SUBNET_ANYCAST_ADDRESSES_RFC4291 ((struct in6_addr) { .s6_addr = { 0xFD, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF } }) |
| #define RESERVED_SUBNET_ANYCAST_PREFIXLEN 7 |
| |
| #define NDISC_APP_ID SD_ID128_MAKE(13,ac,81,a7,d5,3f,49,78,92,79,5d,0c,29,3a,bc,7e) |
| |
| bool link_ipv6_accept_ra_enabled(Link *link) { |
| assert(link); |
| |
| if (!socket_ipv6_is_supported()) |
| return false; |
| |
| if (link->flags & IFF_LOOPBACK) |
| return false; |
| |
| if (!link->network) |
| return false; |
| |
| if (!link_ipv6ll_enabled(link)) |
| return false; |
| |
| assert(link->network->ipv6_accept_ra >= 0); |
| return link->network->ipv6_accept_ra; |
| } |
| |
| void network_adjust_ipv6_accept_ra(Network *network) { |
| assert(network); |
| |
| if (!FLAGS_SET(network->link_local, ADDRESS_FAMILY_IPV6)) { |
| if (network->ipv6_accept_ra > 0) |
| log_warning("%s: IPv6AcceptRA= is enabled but IPv6 link local addressing is disabled or not supported. " |
| "Disabling IPv6AcceptRA=.", network->filename); |
| network->ipv6_accept_ra = false; |
| } |
| |
| if (network->ipv6_accept_ra < 0) |
| /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */ |
| network->ipv6_accept_ra = !FLAGS_SET(network->ip_forward, ADDRESS_FAMILY_IPV6); |
| |
| /* When RouterAllowList=, PrefixAllowList= or RouteAllowList= are specified, then |
| * RouterDenyList=, PrefixDenyList= or RouteDenyList= are ignored, respectively. */ |
| if (!set_isempty(network->ndisc_allow_listed_router)) |
| network->ndisc_deny_listed_router = set_free_free(network->ndisc_deny_listed_router); |
| if (!set_isempty(network->ndisc_allow_listed_prefix)) |
| network->ndisc_deny_listed_prefix = set_free_free(network->ndisc_deny_listed_prefix); |
| if (!set_isempty(network->ndisc_allow_listed_route_prefix)) |
| network->ndisc_deny_listed_route_prefix = set_free_free(network->ndisc_deny_listed_route_prefix); |
| } |
| |
| static int ndisc_remove_old_one(Link *link, const struct in6_addr *router, bool force); |
| |
| static int ndisc_address_callback(Address *address) { |
| struct in6_addr router = {}; |
| NDiscAddress *n; |
| |
| assert(address); |
| assert(address->link); |
| assert(address->family == AF_INET6); |
| |
| SET_FOREACH(n, address->link->ndisc_addresses) |
| if (n->address == address) { |
| router = n->router; |
| break; |
| } |
| |
| if (in6_addr_is_null(&router)) { |
| _cleanup_free_ char *buf = NULL; |
| |
| (void) in6_addr_prefix_to_string(&address->in_addr.in6, address->prefixlen, &buf); |
| log_link_debug(address->link, "%s is called for %s, but it is already removed, ignoring.", |
| __func__, strna(buf)); |
| return 0; |
| } |
| |
| /* Make this called only once */ |
| SET_FOREACH(n, address->link->ndisc_addresses) |
| if (in6_addr_equal(&n->router, &router)) |
| n->address->callback = NULL; |
| |
| return ndisc_remove_old_one(address->link, &router, true); |
| } |
| |
| static int ndisc_remove_old_one(Link *link, const struct in6_addr *router, bool force) { |
| NDiscAddress *na; |
| NDiscRoute *nr; |
| NDiscDNSSL *dnssl; |
| NDiscRDNSS *rdnss; |
| int k, r = 0; |
| bool updated = false; |
| |
| assert(link); |
| assert(router); |
| |
| if (!force) { |
| bool set_callback = false; |
| |
| SET_FOREACH(na, link->ndisc_addresses) |
| if (!na->marked && in6_addr_equal(&na->router, router)) { |
| set_callback = true; |
| break; |
| } |
| |
| if (set_callback) |
| SET_FOREACH(na, link->ndisc_addresses) |
| if (!na->marked && address_is_ready(na->address)) { |
| set_callback = false; |
| break; |
| } |
| |
| if (set_callback) { |
| SET_FOREACH(na, link->ndisc_addresses) |
| if (!na->marked && in6_addr_equal(&na->router, router)) |
| na->address->callback = ndisc_address_callback; |
| |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *buf = NULL; |
| |
| (void) in6_addr_to_string(router, &buf); |
| log_link_debug(link, "No SLAAC address obtained from %s is ready. " |
| "The old NDisc information will be removed later.", |
| strna(buf)); |
| } |
| return 0; |
| } |
| } |
| |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *buf = NULL; |
| |
| (void) in6_addr_to_string(router, &buf); |
| log_link_debug(link, "Removing old NDisc information obtained from %s.", strna(buf)); |
| } |
| |
| SET_FOREACH(na, link->ndisc_addresses) |
| if (na->marked && in6_addr_equal(&na->router, router)) { |
| k = address_remove(na->address, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| SET_FOREACH(nr, link->ndisc_routes) |
| if (nr->marked && in6_addr_equal(&nr->router, router)) { |
| k = route_remove(nr->route, NULL, link); |
| if (k < 0) |
| r = k; |
| } |
| |
| SET_FOREACH(rdnss, link->ndisc_rdnss) |
| if (rdnss->marked && in6_addr_equal(&rdnss->router, router)) { |
| free(set_remove(link->ndisc_rdnss, rdnss)); |
| updated = true; |
| } |
| |
| SET_FOREACH(dnssl, link->ndisc_dnssl) |
| if (dnssl->marked && in6_addr_equal(&dnssl->router, router)) { |
| free(set_remove(link->ndisc_dnssl, dnssl)); |
| updated = true; |
| } |
| |
| if (updated) |
| link_dirty(link); |
| |
| return r; |
| } |
| |
| static int ndisc_remove_old(Link *link) { |
| _cleanup_set_free_free_ Set *routers = NULL; |
| _cleanup_free_ struct in6_addr *router = NULL; |
| struct in6_addr *a; |
| NDiscAddress *na; |
| NDiscRoute *nr; |
| NDiscDNSSL *dnssl; |
| NDiscRDNSS *rdnss; |
| int k, r; |
| |
| assert(link); |
| |
| if (link->ndisc_addresses_messages > 0 || |
| link->ndisc_routes_messages > 0) |
| return 0; |
| |
| routers = set_new(&in6_addr_hash_ops); |
| if (!routers) |
| return -ENOMEM; |
| |
| SET_FOREACH(na, link->ndisc_addresses) |
| if (!set_contains(routers, &na->router)) { |
| router = newdup(struct in6_addr, &na->router, 1); |
| if (!router) |
| return -ENOMEM; |
| |
| r = set_put(routers, router); |
| if (r < 0) |
| return r; |
| |
| assert(r > 0); |
| TAKE_PTR(router); |
| } |
| |
| SET_FOREACH(nr, link->ndisc_routes) |
| if (!set_contains(routers, &nr->router)) { |
| router = newdup(struct in6_addr, &nr->router, 1); |
| if (!router) |
| return -ENOMEM; |
| |
| r = set_put(routers, router); |
| if (r < 0) |
| return r; |
| |
| assert(r > 0); |
| TAKE_PTR(router); |
| } |
| |
| SET_FOREACH(rdnss, link->ndisc_rdnss) |
| if (!set_contains(routers, &rdnss->router)) { |
| router = newdup(struct in6_addr, &rdnss->router, 1); |
| if (!router) |
| return -ENOMEM; |
| |
| r = set_put(routers, router); |
| if (r < 0) |
| return r; |
| |
| assert(r > 0); |
| TAKE_PTR(router); |
| } |
| |
| SET_FOREACH(dnssl, link->ndisc_dnssl) |
| if (!set_contains(routers, &dnssl->router)) { |
| router = newdup(struct in6_addr, &dnssl->router, 1); |
| if (!router) |
| return -ENOMEM; |
| |
| r = set_put(routers, router); |
| if (r < 0) |
| return r; |
| |
| assert(r > 0); |
| TAKE_PTR(router); |
| } |
| |
| r = 0; |
| SET_FOREACH(a, routers) { |
| k = ndisc_remove_old_one(link, a, false); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static void ndisc_route_hash_func(const NDiscRoute *x, struct siphash *state) { |
| route_hash_func(x->route, state); |
| } |
| |
| static int ndisc_route_compare_func(const NDiscRoute *a, const NDiscRoute *b) { |
| return route_compare_func(a->route, b->route); |
| } |
| |
| DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
| ndisc_route_hash_ops, |
| NDiscRoute, |
| ndisc_route_hash_func, |
| ndisc_route_compare_func, |
| free); |
| |
| static int ndisc_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->ndisc_routes_messages > 0); |
| |
| link->ndisc_routes_messages--; |
| |
| r = route_configure_handler_internal(rtnl, m, link, "Could not set NDisc route"); |
| if (r <= 0) |
| return r; |
| |
| if (link->ndisc_routes_messages == 0) { |
| log_link_debug(link, "NDisc routes set."); |
| link->ndisc_routes_configured = true; |
| |
| r = ndisc_remove_old(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return 1; |
| } |
| |
| link_check_ready(link); |
| } |
| |
| return 1; |
| } |
| |
| static int ndisc_after_route_configure(Request *req, void *object) { |
| _cleanup_free_ NDiscRoute *nr = NULL; |
| NDiscRoute *nr_exist; |
| struct in6_addr router; |
| Route *route = object; |
| sd_ndisc_router *rt; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ROUTE); |
| assert(req->userdata); |
| assert(route); |
| |
| link = req->link; |
| rt = req->userdata; |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| nr = new(NDiscRoute, 1); |
| if (!nr) |
| return log_oom(); |
| |
| *nr = (NDiscRoute) { |
| .router = router, |
| .route = route, |
| }; |
| |
| nr_exist = set_get(link->ndisc_routes, nr); |
| if (nr_exist) { |
| nr_exist->marked = false; |
| nr_exist->router = router; |
| return 0; |
| } |
| |
| r = set_ensure_put(&link->ndisc_routes, &ndisc_route_hash_ops, nr); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store NDisc SLAAC route: %m"); |
| assert(r > 0); |
| TAKE_PTR(nr); |
| |
| return 0; |
| } |
| |
| static void ndisc_request_on_free(Request *req) { |
| assert(req); |
| |
| sd_ndisc_router_unref(req->userdata); |
| } |
| |
| static int ndisc_request_route(Route *in, Link *link, sd_ndisc_router *rt) { |
| _cleanup_(route_freep) Route *route = in; |
| Request *req; |
| int r; |
| |
| assert(route); |
| assert(link); |
| assert(rt); |
| |
| r = link_has_route(link, route); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| link->ndisc_routes_configured = false; |
| |
| r = link_request_route(link, TAKE_PTR(route), true, &link->ndisc_routes_messages, |
| ndisc_route_handler, &req); |
| if (r <= 0) |
| return r; |
| |
| req->userdata = sd_ndisc_router_ref(rt); |
| req->after_configure = ndisc_after_route_configure; |
| req->on_free = ndisc_request_on_free; |
| |
| return 0; |
| } |
| |
| static void ndisc_address_hash_func(const NDiscAddress *x, struct siphash *state) { |
| address_hash_func(x->address, state); |
| } |
| |
| static int ndisc_address_compare_func(const NDiscAddress *a, const NDiscAddress *b) { |
| return address_compare_func(a->address, b->address); |
| } |
| |
| DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
| ndisc_address_hash_ops, |
| NDiscAddress, |
| ndisc_address_hash_func, |
| ndisc_address_compare_func, |
| free); |
| |
| static int ndisc_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->ndisc_addresses_messages > 0); |
| |
| link->ndisc_addresses_messages--; |
| |
| r = address_configure_handler_internal(rtnl, m, link, "Could not set NDisc address"); |
| if (r <= 0) |
| return r; |
| |
| if (link->ndisc_addresses_messages == 0) { |
| log_link_debug(link, "NDisc SLAAC addresses set."); |
| link->ndisc_addresses_configured = true; |
| |
| r = ndisc_remove_old(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return 1; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static int ndisc_after_address_configure(Request *req, void *object) { |
| _cleanup_free_ NDiscAddress *na = NULL; |
| NDiscAddress *na_exist; |
| struct in6_addr router; |
| sd_ndisc_router *rt; |
| Address *address = object; |
| Link *link; |
| int r; |
| |
| assert(req); |
| assert(req->link); |
| assert(req->type == REQUEST_TYPE_ADDRESS); |
| assert(req->userdata); |
| assert(address); |
| |
| link = req->link; |
| rt = req->userdata; |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| na = new(NDiscAddress, 1); |
| if (!na) |
| return log_oom(); |
| |
| *na = (NDiscAddress) { |
| .router = router, |
| .address = address, |
| }; |
| |
| na_exist = set_get(link->ndisc_addresses, na); |
| if (na_exist) { |
| na_exist->marked = false; |
| na_exist->router = router; |
| return 0; |
| } |
| |
| r = set_ensure_put(&link->ndisc_addresses, &ndisc_address_hash_ops, na); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store NDisc SLAAC address: %m"); |
| assert(r > 0); |
| TAKE_PTR(na); |
| |
| return 0; |
| } |
| |
| static int ndisc_request_address(Address *in, Link *link, sd_ndisc_router *rt) { |
| _cleanup_(address_freep) Address *address = in; |
| Request *req; |
| int r; |
| |
| assert(address); |
| assert(link); |
| assert(rt); |
| |
| if (address_get(link, address, NULL) < 0) |
| link->ndisc_addresses_configured = false; |
| |
| r = link_request_address(link, TAKE_PTR(address), true, &link->ndisc_addresses_messages, |
| ndisc_address_handler, &req); |
| if (r <= 0) |
| return r; |
| |
| req->userdata = sd_ndisc_router_ref(rt); |
| req->after_configure = ndisc_after_address_configure; |
| req->on_free = ndisc_request_on_free; |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) { |
| _cleanup_(route_freep) Route *route = NULL; |
| struct in6_addr gateway; |
| uint16_t lifetime; |
| unsigned preference; |
| uint32_t table, mtu; |
| usec_t time_now; |
| int r; |
| |
| assert(link); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_lifetime(rt, &lifetime); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get gateway lifetime from RA: %m"); |
| |
| if (lifetime == 0) /* not a default router */ |
| return 0; |
| |
| r = sd_ndisc_router_get_address(rt, &gateway); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m"); |
| |
| if (link_get_ipv6_address(link, &gateway, NULL) >= 0) { |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *buffer = NULL; |
| |
| (void) in6_addr_to_string(&gateway, &buffer); |
| log_link_debug(link, "No NDisc route added, gateway %s matches local address", |
| strna(buffer)); |
| } |
| return 0; |
| } |
| |
| r = sd_ndisc_router_get_preference(rt, &preference); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get default router preference from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_get_mtu(rt, &mtu); |
| if (r == -ENODATA) |
| mtu = 0; |
| else if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get default router MTU from RA: %m"); |
| |
| table = link_get_ipv6_accept_ra_route_table(link); |
| |
| r = route_new(&route); |
| if (r < 0) |
| return log_oom(); |
| |
| route->family = AF_INET6; |
| route->table = table; |
| route->priority = link->network->ipv6_accept_ra_route_metric; |
| route->protocol = RTPROT_RA; |
| route->pref = preference; |
| route->gw_family = AF_INET6; |
| route->gw.in6 = gateway; |
| route->lifetime = usec_add(time_now, lifetime * USEC_PER_SEC); |
| route->mtu = mtu; |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request default route: %m"); |
| |
| Route *route_gw; |
| HASHMAP_FOREACH(route_gw, link->network->routes_by_section) { |
| if (!route_gw->gateway_from_dhcp_or_ra) |
| continue; |
| |
| if (route_gw->gw_family != AF_INET6) |
| continue; |
| |
| r = route_dup(route_gw, &route); |
| if (r < 0) |
| return r; |
| |
| route->gw.in6 = gateway; |
| if (!route->table_set) |
| route->table = table; |
| if (!route->priority_set) |
| route->priority = link->network->ipv6_accept_ra_route_metric; |
| if (!route->protocol_set) |
| route->protocol = RTPROT_RA; |
| if (!route->pref_set) |
| route->pref = preference; |
| route->lifetime = usec_add(time_now, lifetime * USEC_PER_SEC); |
| if (route->mtu == 0) |
| route->mtu = mtu; |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request gateway: %m"); |
| } |
| |
| return 0; |
| } |
| |
| static bool stableprivate_address_is_valid(const struct in6_addr *addr) { |
| assert(addr); |
| |
| /* According to rfc4291, generated address should not be in the following ranges. */ |
| |
| if (memcmp(addr, &SUBNET_ROUTER_ANYCAST_ADDRESS_RFC4291, SUBNET_ROUTER_ANYCAST_PREFIXLEN) == 0) |
| return false; |
| |
| if (memcmp(addr, &RESERVED_IPV6_INTERFACE_IDENTIFIERS_ADDRESS_RFC4291, RESERVED_IPV6_INTERFACE_IDENTIFIERS_PREFIXLEN) == 0) |
| return false; |
| |
| if (memcmp(addr, &RESERVED_SUBNET_ANYCAST_ADDRESSES_RFC4291, RESERVED_SUBNET_ANYCAST_PREFIXLEN) == 0) |
| return false; |
| |
| return true; |
| } |
| |
| static int make_stableprivate_address(Link *link, const struct in6_addr *prefix, uint8_t prefix_len, uint8_t dad_counter, struct in6_addr **ret) { |
| _cleanup_free_ struct in6_addr *addr = NULL; |
| sd_id128_t secret_key; |
| struct siphash state; |
| uint64_t rid; |
| size_t l; |
| int r; |
| |
| /* According to rfc7217 section 5.1 |
| * RID = F(Prefix, Net_Iface, Network_ID, DAD_Counter, secret_key) */ |
| |
| r = sd_id128_get_machine_app_specific(NDISC_APP_ID, &secret_key); |
| if (r < 0) |
| return log_error_errno(r, "Failed to generate key: %m"); |
| |
| siphash24_init(&state, secret_key.bytes); |
| |
| l = MAX(DIV_ROUND_UP(prefix_len, 8), 8); |
| siphash24_compress(prefix, l, &state); |
| siphash24_compress_string(link->ifname, &state); |
| /* Only last 8 bytes of IB MAC are stable */ |
| if (link->iftype == ARPHRD_INFINIBAND) |
| siphash24_compress(&link->hw_addr.infiniband[12], 8, &state); |
| else |
| siphash24_compress(link->hw_addr.bytes, link->hw_addr.length, &state); |
| siphash24_compress(&dad_counter, sizeof(uint8_t), &state); |
| |
| rid = htole64(siphash24_finalize(&state)); |
| |
| addr = new(struct in6_addr, 1); |
| if (!addr) |
| return log_oom(); |
| |
| memcpy(addr->s6_addr, prefix->s6_addr, l); |
| memcpy(addr->s6_addr + l, &rid, 16 - l); |
| |
| if (!stableprivate_address_is_valid(addr)) { |
| *ret = NULL; |
| return 0; |
| } |
| |
| *ret = TAKE_PTR(addr); |
| return 1; |
| } |
| |
| static int ndisc_router_generate_addresses(Link *link, struct in6_addr *address, uint8_t prefixlen, Set **ret) { |
| _cleanup_set_free_free_ Set *addresses = NULL; |
| IPv6Token *j; |
| int r; |
| |
| assert(link); |
| assert(address); |
| assert(ret); |
| |
| addresses = set_new(&in6_addr_hash_ops); |
| if (!addresses) |
| return log_oom(); |
| |
| ORDERED_SET_FOREACH(j, link->network->ipv6_tokens) { |
| _cleanup_free_ struct in6_addr *new_address = NULL; |
| |
| if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_PREFIXSTABLE |
| && (in6_addr_is_null(&j->prefix) || in6_addr_equal(&j->prefix, address))) { |
| /* While this loop uses dad_counter and a retry limit as specified in RFC 7217, the loop |
| * does not actually attempt Duplicate Address Detection; the counter will be incremented |
| * only when the address generation algorithm produces an invalid address, and the loop |
| * may exit with an address which ends up being unusable due to duplication on the link. */ |
| for (; j->dad_counter < DAD_CONFLICTS_IDGEN_RETRIES_RFC7217; j->dad_counter++) { |
| r = make_stableprivate_address(link, address, prefixlen, j->dad_counter, &new_address); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| break; |
| } |
| } else if (j->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_STATIC) { |
| new_address = new(struct in6_addr, 1); |
| if (!new_address) |
| return log_oom(); |
| |
| memcpy(new_address->s6_addr, address->s6_addr, 8); |
| memcpy(new_address->s6_addr + 8, j->prefix.s6_addr + 8, 8); |
| } |
| |
| if (new_address) { |
| r = set_put(addresses, new_address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store SLAAC address: %m"); |
| else if (r == 0) |
| log_link_debug_errno(link, r, "Generated SLAAC address is duplicated, ignoring."); |
| else |
| TAKE_PTR(new_address); |
| } |
| } |
| |
| /* fall back to EUI-64 if no tokens provided addresses */ |
| if (set_isempty(addresses)) { |
| _cleanup_free_ struct in6_addr *new_address = NULL; |
| |
| new_address = newdup(struct in6_addr, address, 1); |
| if (!new_address) |
| return log_oom(); |
| |
| r = generate_ipv6_eui_64_address(link, new_address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to generate EUI64 address: %m"); |
| |
| r = set_put(addresses, new_address); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to store SLAAC address: %m"); |
| |
| TAKE_PTR(new_address); |
| } |
| |
| *ret = TAKE_PTR(addresses); |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) { |
| uint32_t lifetime_valid, lifetime_preferred; |
| _cleanup_set_free_free_ Set *addresses = NULL; |
| struct in6_addr addr, *a; |
| unsigned prefixlen; |
| usec_t time_now; |
| int r; |
| |
| assert(link); |
| assert(rt); |
| |
| /* Do not use clock_boottime_or_monotonic() here, as the kernel internally manages cstamp and |
| * tstamp with jiffies, and it is not increased while the system is suspended. */ |
| r = sd_ndisc_router_get_timestamp(rt, CLOCK_MONOTONIC, &time_now); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix length: %m"); |
| |
| r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime_valid); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix valid lifetime: %m"); |
| |
| if (lifetime_valid == 0) { |
| log_link_debug(link, "Ignoring prefix as its valid lifetime is zero."); |
| return 0; |
| } |
| |
| r = sd_ndisc_router_prefix_get_preferred_lifetime(rt, &lifetime_preferred); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix preferred lifetime: %m"); |
| |
| /* The preferred lifetime is never greater than the valid lifetime */ |
| if (lifetime_preferred > lifetime_valid) |
| return 0; |
| |
| r = sd_ndisc_router_prefix_get_address(rt, &addr); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix address: %m"); |
| |
| r = ndisc_router_generate_addresses(link, &addr, prefixlen, &addresses); |
| if (r < 0) |
| return r; |
| |
| SET_FOREACH(a, addresses) { |
| _cleanup_(address_freep) Address *address = NULL; |
| Address *e; |
| |
| r = address_new(&address); |
| if (r < 0) |
| return log_oom(); |
| |
| address->family = AF_INET6; |
| address->in_addr.in6 = *a; |
| address->prefixlen = prefixlen; |
| address->flags = IFA_F_NOPREFIXROUTE|IFA_F_MANAGETEMPADDR; |
| address->cinfo.ifa_valid = lifetime_valid; |
| address->cinfo.ifa_prefered = lifetime_preferred; |
| |
| /* See RFC4862, section 5.5.3.e. But the following logic is deviated from RFC4862 by |
| * honoring all valid lifetimes to improve the reaction of SLAAC to renumbering events. |
| * See draft-ietf-6man-slaac-renum-02, section 4.2. */ |
| r = address_get(link, address, &e); |
| if (r > 0) { |
| /* If the address is already assigned, but not valid anymore, then refuse to |
| * update the address, and it will be removed. */ |
| if (e->cinfo.ifa_valid != CACHE_INFO_INFINITY_LIFE_TIME && |
| usec_add(e->cinfo.tstamp / 100 * USEC_PER_SEC, |
| e->cinfo.ifa_valid * USEC_PER_SEC) < time_now) |
| continue; |
| } |
| |
| r = ndisc_request_address(TAKE_PTR(address), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request SLAAC address: %m"); |
| } |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_onlink_prefix(Link *link, sd_ndisc_router *rt) { |
| _cleanup_(route_freep) Route *route = NULL; |
| usec_t time_now; |
| uint32_t lifetime; |
| unsigned prefixlen; |
| int r; |
| |
| assert(link); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix length: %m"); |
| |
| r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix lifetime: %m"); |
| |
| r = route_new(&route); |
| if (r < 0) |
| return log_oom(); |
| |
| route->family = AF_INET6; |
| route->table = link_get_ipv6_accept_ra_route_table(link); |
| route->priority = link->network->ipv6_accept_ra_route_metric; |
| route->protocol = RTPROT_RA; |
| route->flags = RTM_F_PREFIX; |
| route->dst_prefixlen = prefixlen; |
| route->lifetime = usec_add(time_now, lifetime * USEC_PER_SEC); |
| |
| r = sd_ndisc_router_prefix_get_address(rt, &route->dst.in6); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix address: %m"); |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request prefix route: %m");; |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) { |
| _cleanup_(route_freep) Route *route = NULL; |
| struct in6_addr gateway, dst; |
| uint32_t lifetime; |
| unsigned preference, prefixlen; |
| usec_t time_now; |
| int r; |
| |
| assert(link); |
| |
| r = sd_ndisc_router_route_get_lifetime(rt, &lifetime); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get route lifetime from RA: %m"); |
| |
| if (lifetime == 0) |
| return 0; |
| |
| r = sd_ndisc_router_route_get_address(rt, &dst); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get route destination address: %m"); |
| |
| if ((!set_isempty(link->network->ndisc_allow_listed_route_prefix) && |
| !set_contains(link->network->ndisc_allow_listed_route_prefix, &dst)) || |
| set_contains(link->network->ndisc_deny_listed_route_prefix, &dst)) { |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *buf = NULL; |
| |
| (void) in6_addr_to_string(&dst, &buf); |
| if (!set_isempty(link->network->ndisc_allow_listed_route_prefix)) |
| log_link_debug(link, "Route prefix '%s' is not in allow list, ignoring", strna(buf)); |
| else |
| log_link_debug(link, "Route prefix '%s' is in deny list, ignoring", strna(buf)); |
| } |
| return 0; |
| } |
| |
| r = sd_ndisc_router_get_address(rt, &gateway); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get gateway address from RA: %m"); |
| |
| if (link_get_ipv6_address(link, &gateway, NULL) >= 0) { |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *buf = NULL; |
| |
| (void) in6_addr_to_string(&gateway, &buf); |
| log_link_debug(link, "Advertised route gateway %s is local to the link, ignoring route", strna(buf)); |
| } |
| return 0; |
| } |
| |
| r = sd_ndisc_router_route_get_prefixlen(rt, &prefixlen); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get route prefix length: %m"); |
| |
| r = sd_ndisc_router_route_get_preference(rt, &preference); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get default router preference from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = route_new(&route); |
| if (r < 0) |
| return log_oom(); |
| |
| route->family = AF_INET6; |
| route->table = link_get_ipv6_accept_ra_route_table(link); |
| route->priority = link->network->ipv6_accept_ra_route_metric; |
| route->protocol = RTPROT_RA; |
| route->pref = preference; |
| route->gw.in6 = gateway; |
| route->gw_family = AF_INET6; |
| route->dst.in6 = dst; |
| route->dst_prefixlen = prefixlen; |
| route->lifetime = usec_add(time_now, lifetime * USEC_PER_SEC); |
| |
| r = ndisc_request_route(TAKE_PTR(route), link, rt); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not request additional route: %m"); |
| |
| return 0; |
| } |
| |
| static void ndisc_rdnss_hash_func(const NDiscRDNSS *x, struct siphash *state) { |
| siphash24_compress(&x->address, sizeof(x->address), state); |
| } |
| |
| static int ndisc_rdnss_compare_func(const NDiscRDNSS *a, const NDiscRDNSS *b) { |
| return memcmp(&a->address, &b->address, sizeof(a->address)); |
| } |
| |
| DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
| ndisc_rdnss_hash_ops, |
| NDiscRDNSS, |
| ndisc_rdnss_hash_func, |
| ndisc_rdnss_compare_func, |
| free); |
| |
| static int ndisc_router_process_rdnss(Link *link, sd_ndisc_router *rt) { |
| uint32_t lifetime; |
| const struct in6_addr *a; |
| struct in6_addr router; |
| NDiscRDNSS *rdnss; |
| usec_t time_now; |
| bool updated = false; |
| int n, r; |
| |
| assert(link); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_rdnss_get_lifetime(rt, &lifetime); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RDNSS lifetime: %m"); |
| |
| n = sd_ndisc_router_rdnss_get_addresses(rt, &a); |
| if (n < 0) |
| return log_link_error_errno(link, n, "Failed to get RDNSS addresses: %m"); |
| |
| SET_FOREACH(rdnss, link->ndisc_rdnss) |
| if (in6_addr_equal(&rdnss->router, &router)) |
| rdnss->marked = true; |
| |
| if (lifetime == 0) |
| return 0; |
| |
| if (n >= (int) NDISC_RDNSS_MAX) { |
| log_link_warning(link, "Too many RDNSS records per link. Only first %i records will be used.", NDISC_RDNSS_MAX); |
| n = NDISC_RDNSS_MAX; |
| } |
| |
| for (int j = 0; j < n; j++) { |
| _cleanup_free_ NDiscRDNSS *x = NULL; |
| NDiscRDNSS d = { |
| .address = a[j], |
| }; |
| |
| rdnss = set_get(link->ndisc_rdnss, &d); |
| if (rdnss) { |
| rdnss->marked = false; |
| rdnss->router = router; |
| rdnss->valid_until = time_now + lifetime * USEC_PER_SEC; |
| continue; |
| } |
| |
| x = new(NDiscRDNSS, 1); |
| if (!x) |
| return log_oom(); |
| |
| *x = (NDiscRDNSS) { |
| .address = a[j], |
| .router = router, |
| .valid_until = time_now + lifetime * USEC_PER_SEC, |
| }; |
| |
| r = set_ensure_consume(&link->ndisc_rdnss, &ndisc_rdnss_hash_ops, TAKE_PTR(x)); |
| if (r < 0) |
| return log_oom(); |
| assert(r > 0); |
| |
| updated = true; |
| } |
| |
| if (updated) |
| link_dirty(link); |
| |
| return 0; |
| } |
| |
| static void ndisc_dnssl_hash_func(const NDiscDNSSL *x, struct siphash *state) { |
| siphash24_compress_string(NDISC_DNSSL_DOMAIN(x), state); |
| } |
| |
| static int ndisc_dnssl_compare_func(const NDiscDNSSL *a, const NDiscDNSSL *b) { |
| return strcmp(NDISC_DNSSL_DOMAIN(a), NDISC_DNSSL_DOMAIN(b)); |
| } |
| |
| DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
| ndisc_dnssl_hash_ops, |
| NDiscDNSSL, |
| ndisc_dnssl_hash_func, |
| ndisc_dnssl_compare_func, |
| free); |
| |
| static int ndisc_router_process_dnssl(Link *link, sd_ndisc_router *rt) { |
| _cleanup_strv_free_ char **l = NULL; |
| struct in6_addr router; |
| uint32_t lifetime; |
| usec_t time_now; |
| NDiscDNSSL *dnssl; |
| bool updated = false; |
| char **j; |
| int r; |
| |
| assert(link); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| r = sd_ndisc_router_get_timestamp(rt, clock_boottime_or_monotonic(), &time_now); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA timestamp: %m"); |
| |
| r = sd_ndisc_router_dnssl_get_lifetime(rt, &lifetime); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get DNSSL lifetime: %m"); |
| |
| r = sd_ndisc_router_dnssl_get_domains(rt, &l); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get DNSSL addresses: %m"); |
| |
| SET_FOREACH(dnssl, link->ndisc_dnssl) |
| if (in6_addr_equal(&dnssl->router, &router)) |
| dnssl->marked = true; |
| |
| if (lifetime == 0) |
| return 0; |
| |
| if (strv_length(l) >= NDISC_DNSSL_MAX) { |
| log_link_warning(link, "Too many DNSSL records per link. Only first %i records will be used.", NDISC_DNSSL_MAX); |
| STRV_FOREACH(j, l + NDISC_DNSSL_MAX) |
| *j = mfree(*j); |
| } |
| |
| STRV_FOREACH(j, l) { |
| _cleanup_free_ NDiscDNSSL *s = NULL; |
| |
| s = malloc0(ALIGN(sizeof(NDiscDNSSL)) + strlen(*j) + 1); |
| if (!s) |
| return log_oom(); |
| |
| strcpy(NDISC_DNSSL_DOMAIN(s), *j); |
| |
| dnssl = set_get(link->ndisc_dnssl, s); |
| if (dnssl) { |
| dnssl->marked = false; |
| dnssl->router = router; |
| dnssl->valid_until = time_now + lifetime * USEC_PER_SEC; |
| continue; |
| } |
| |
| s->router = router; |
| s->valid_until = time_now + lifetime * USEC_PER_SEC; |
| |
| r = set_ensure_consume(&link->ndisc_dnssl, &ndisc_dnssl_hash_ops, TAKE_PTR(s)); |
| if (r < 0) |
| return log_oom(); |
| assert(r > 0); |
| |
| updated = true; |
| } |
| |
| if (updated) |
| link_dirty(link); |
| |
| return 0; |
| } |
| |
| static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) { |
| assert(link); |
| assert(link->network); |
| assert(rt); |
| |
| for (int r = sd_ndisc_router_option_rewind(rt); ; r = sd_ndisc_router_option_next(rt)) { |
| uint8_t type; |
| |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to iterate through options: %m"); |
| if (r == 0) /* EOF */ |
| return 0; |
| |
| r = sd_ndisc_router_option_get_type(rt, &type); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA option type: %m"); |
| |
| switch (type) { |
| |
| case SD_NDISC_OPTION_PREFIX_INFORMATION: { |
| struct in6_addr a; |
| uint8_t flags; |
| |
| r = sd_ndisc_router_prefix_get_address(rt, &a); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get prefix address: %m"); |
| |
| if ((!set_isempty(link->network->ndisc_allow_listed_prefix) && |
| !set_contains(link->network->ndisc_allow_listed_prefix, &a)) || |
| set_contains(link->network->ndisc_deny_listed_prefix, &a)) { |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *b = NULL; |
| |
| (void) in6_addr_to_string(&a, &b); |
| if (!set_isempty(link->network->ndisc_allow_listed_prefix)) |
| log_link_debug(link, "Prefix '%s' is not in allow list, ignoring", strna(b)); |
| else |
| log_link_debug(link, "Prefix '%s' is in deny list, ignoring", strna(b)); |
| } |
| break; |
| } |
| |
| r = sd_ndisc_router_prefix_get_flags(rt, &flags); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA prefix flags: %m"); |
| |
| if (link->network->ipv6_accept_ra_use_onlink_prefix && |
| FLAGS_SET(flags, ND_OPT_PI_FLAG_ONLINK)) { |
| r = ndisc_router_process_onlink_prefix(link, rt); |
| if (r < 0) |
| return r; |
| } |
| |
| if (link->network->ipv6_accept_ra_use_autonomous_prefix && |
| FLAGS_SET(flags, ND_OPT_PI_FLAG_AUTO)) { |
| r = ndisc_router_process_autonomous_prefix(link, rt); |
| if (r < 0) |
| return r; |
| } |
| break; |
| } |
| |
| case SD_NDISC_OPTION_ROUTE_INFORMATION: |
| r = ndisc_router_process_route(link, rt); |
| if (r < 0) |
| return r; |
| break; |
| |
| case SD_NDISC_OPTION_RDNSS: |
| if (link->network->ipv6_accept_ra_use_dns) { |
| r = ndisc_router_process_rdnss(link, rt); |
| if (r < 0) |
| return r; |
| } |
| break; |
| |
| case SD_NDISC_OPTION_DNSSL: |
| if (link->network->ipv6_accept_ra_use_dns) { |
| r = ndisc_router_process_dnssl(link, rt); |
| if (r < 0) |
| return r; |
| } |
| break; |
| } |
| } |
| } |
| |
| static int ndisc_router_handler(Link *link, sd_ndisc_router *rt) { |
| struct in6_addr router; |
| uint64_t flags; |
| NDiscAddress *na; |
| NDiscRoute *nr; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->manager); |
| assert(rt); |
| |
| r = sd_ndisc_router_get_address(rt, &router); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get router address from RA: %m"); |
| |
| if ((!set_isempty(link->network->ndisc_allow_listed_router) && |
| !set_contains(link->network->ndisc_allow_listed_router, &router)) || |
| set_contains(link->network->ndisc_deny_listed_router, &router)) { |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *buf = NULL; |
| |
| (void) in6_addr_to_string(&router, &buf); |
| if (!set_isempty(link->network->ndisc_allow_listed_router)) |
| log_link_debug(link, "Router '%s' is not in allow list, ignoring", strna(buf)); |
| else |
| log_link_debug(link, "Router '%s' is in deny list, ignoring", strna(buf)); |
| } |
| return 0; |
| } |
| |
| SET_FOREACH(na, link->ndisc_addresses) |
| if (in6_addr_equal(&na->router, &router)) |
| na->marked = true; |
| |
| SET_FOREACH(nr, link->ndisc_routes) |
| if (in6_addr_equal(&nr->router, &router)) |
| nr->marked = true; |
| |
| r = sd_ndisc_router_get_flags(rt, &flags); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Failed to get RA flags: %m"); |
| |
| if ((flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER) && |
| link->network->ipv6_accept_ra_start_dhcp6_client != IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO) || |
| link->network->ipv6_accept_ra_start_dhcp6_client == IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS) { |
| |
| if (flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) |
| /* (re)start DHCPv6 client in stateful or stateless mode according to RA flags */ |
| r = dhcp6_request_information(link, !(flags & ND_RA_FLAG_MANAGED)); |
| else |
| /* When IPv6AcceptRA.DHCPv6Client=always, start dhcp6 client in managed mode |
| * even if router does not have M or O flag. */ |
| r = dhcp6_request_information(link, false); |
| if (r < 0 && r != -EBUSY) |
| return log_link_error_errno(link, r, "Could not acquire DHCPv6 lease on NDisc request: %m"); |
| else |
| log_link_debug(link, "Acquiring DHCPv6 lease on NDisc request"); |
| } |
| |
| r = ndisc_router_process_default(link, rt); |
| if (r < 0) |
| return r; |
| r = ndisc_router_process_options(link, rt); |
| if (r < 0) |
| return r; |
| |
| if (link->ndisc_addresses_messages == 0) |
| link->ndisc_addresses_configured = true; |
| else |
| log_link_debug(link, "Setting SLAAC addresses."); |
| |
| if (link->ndisc_routes_messages == 0) |
| link->ndisc_routes_configured = true; |
| else |
| log_link_debug(link, "Setting NDisc routes."); |
| |
| r = ndisc_remove_old(link); |
| if (r < 0) |
| return r; |
| |
| if (!link->ndisc_addresses_configured || !link->ndisc_routes_configured) |
| link_set_state(link, LINK_STATE_CONFIGURING); |
| |
| link_check_ready(link); |
| return 0; |
| } |
| |
| static void ndisc_handler(sd_ndisc *nd, sd_ndisc_event_t event, sd_ndisc_router *rt, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return; |
| |
| switch (event) { |
| |
| case SD_NDISC_EVENT_ROUTER: |
| r = ndisc_router_handler(link, rt); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| break; |
| |
| case SD_NDISC_EVENT_TIMEOUT: |
| log_link_debug(link, "NDisc handler get timeout event"); |
| if (link->ndisc_addresses_messages == 0 && link->ndisc_routes_messages == 0) { |
| link->ndisc_addresses_configured = true; |
| link->ndisc_routes_configured = true; |
| link_check_ready(link); |
| } |
| break; |
| default: |
| assert_not_reached("Unknown NDisc event"); |
| } |
| } |
| |
| int ndisc_configure(Link *link) { |
| int r; |
| |
| assert(link); |
| |
| if (!link_ipv6_accept_ra_enabled(link)) |
| return 0; |
| |
| if (link->ndisc) |
| return -EBUSY; /* Already configured. */ |
| |
| r = sd_ndisc_new(&link->ndisc); |
| if (r < 0) |
| return r; |
| |
| r = sd_ndisc_attach_event(link->ndisc, link->manager->event, 0); |
| if (r < 0) |
| return r; |
| |
| r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether); |
| if (r < 0) |
| return r; |
| |
| r = sd_ndisc_set_ifindex(link->ndisc, link->ifindex); |
| if (r < 0) |
| return r; |
| |
| r = sd_ndisc_set_callback(link->ndisc, ndisc_handler, link); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int ndisc_start(Link *link) { |
| assert(link); |
| |
| if (!link->ndisc || !link->dhcp6_client) |
| return 0; |
| |
| log_link_debug(link, "Discovering IPv6 routers"); |
| |
| return sd_ndisc_start(link->ndisc); |
| } |
| |
| void ndisc_vacuum(Link *link) { |
| NDiscRDNSS *r; |
| NDiscDNSSL *d; |
| usec_t time_now; |
| |
| assert(link); |
| |
| /* Removes all RDNSS and DNSSL entries whose validity time has passed */ |
| |
| time_now = now(clock_boottime_or_monotonic()); |
| |
| SET_FOREACH(r, link->ndisc_rdnss) |
| if (r->valid_until < time_now) |
| free(set_remove(link->ndisc_rdnss, r)); |
| |
| SET_FOREACH(d, link->ndisc_dnssl) |
| if (d->valid_until < time_now) |
| free(set_remove(link->ndisc_dnssl, d)); |
| } |
| |
| void ndisc_flush(Link *link) { |
| assert(link); |
| |
| /* Removes all RDNSS and DNSSL entries, without exception */ |
| |
| link->ndisc_rdnss = set_free(link->ndisc_rdnss); |
| link->ndisc_dnssl = set_free(link->ndisc_dnssl); |
| } |
| |
| int ipv6token_new(IPv6Token **ret) { |
| IPv6Token *p; |
| |
| p = new(IPv6Token, 1); |
| if (!p) |
| return -ENOMEM; |
| |
| *p = (IPv6Token) { |
| .address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_NONE, |
| }; |
| |
| *ret = TAKE_PTR(p); |
| |
| return 0; |
| } |
| |
| static void ipv6_token_hash_func(const IPv6Token *p, struct siphash *state) { |
| siphash24_compress(&p->address_generation_type, sizeof(p->address_generation_type), state); |
| siphash24_compress(&p->prefix, sizeof(p->prefix), state); |
| } |
| |
| static int ipv6_token_compare_func(const IPv6Token *a, const IPv6Token *b) { |
| int r; |
| |
| r = CMP(a->address_generation_type, b->address_generation_type); |
| if (r != 0) |
| return r; |
| |
| return memcmp(&a->prefix, &b->prefix, sizeof(struct in6_addr)); |
| } |
| |
| DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR( |
| ipv6_token_hash_ops, |
| IPv6Token, |
| ipv6_token_hash_func, |
| ipv6_token_compare_func, |
| free); |
| |
| int config_parse_ndisc_address_filter( |
| 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) { |
| |
| Set **list = data; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| if (isempty(rvalue)) { |
| *list = set_free_free(*list); |
| return 0; |
| } |
| |
| for (const char *p = rvalue;;) { |
| _cleanup_free_ char *n = NULL; |
| _cleanup_free_ struct in6_addr *a = NULL; |
| union in_addr_union ip; |
| |
| r = extract_first_word(&p, &n, NULL, 0); |
| if (r == -ENOMEM) |
| return log_oom(); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to parse NDisc %s=, ignoring assignment: %s", |
| lvalue, rvalue); |
| return 0; |
| } |
| if (r == 0) |
| return 0; |
| |
| r = in_addr_from_string(AF_INET6, n, &ip); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "NDisc %s= entry is invalid, ignoring assignment: %s", |
| lvalue, n); |
| continue; |
| } |
| |
| a = newdup(struct in6_addr, &ip.in6, 1); |
| if (!a) |
| return log_oom(); |
| |
| r = set_ensure_consume(list, &in6_addr_hash_ops, TAKE_PTR(a)); |
| if (r < 0) |
| return log_oom(); |
| if (r == 0) |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "NDisc %s= entry is duplicated, ignoring assignment: %s", |
| lvalue, n); |
| } |
| } |
| |
| int config_parse_address_generation_type( |
| const char *unit, |
| const char *filename, |
| unsigned line, |
| const char *section, |
| unsigned section_line, |
| const char *lvalue, |
| int ltype, |
| const char *rvalue, |
| void *data, |
| void *userdata) { |
| |
| _cleanup_free_ IPv6Token *token = NULL; |
| union in_addr_union buffer; |
| Network *network = data; |
| const char *p; |
| int r; |
| |
| assert(filename); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| if (isempty(rvalue)) { |
| network->ipv6_tokens = ordered_set_free(network->ipv6_tokens); |
| return 0; |
| } |
| |
| r = ipv6token_new(&token); |
| if (r < 0) |
| return log_oom(); |
| |
| if ((p = startswith(rvalue, "prefixstable"))) { |
| token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_PREFIXSTABLE; |
| if (*p == ':') |
| p++; |
| else if (*p == '\0') |
| p = NULL; |
| else { |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "Invalid IPv6 token mode in %s=, ignoring assignment: %s", |
| lvalue, rvalue); |
| return 0; |
| } |
| } else { |
| token->address_generation_type = IPV6_TOKEN_ADDRESS_GENERATION_STATIC; |
| p = startswith(rvalue, "static:"); |
| if (!p) |
| p = rvalue; |
| } |
| |
| if (p) { |
| r = in_addr_from_string(AF_INET6, p, &buffer); |
| if (r < 0) { |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to parse IP address in %s=, ignoring assignment: %s", |
| lvalue, rvalue); |
| return 0; |
| } |
| if (token->address_generation_type == IPV6_TOKEN_ADDRESS_GENERATION_STATIC && |
| in_addr_is_null(AF_INET6, &buffer)) { |
| log_syntax(unit, LOG_WARNING, filename, line, 0, |
| "IPv6 address in %s= cannot be the ANY address, ignoring assignment: %s", |
| lvalue, rvalue); |
| return 0; |
| } |
| token->prefix = buffer.in6; |
| } |
| |
| r = ordered_set_ensure_put(&network->ipv6_tokens, &ipv6_token_hash_ops, token); |
| if (r == -ENOMEM) |
| return log_oom(); |
| if (r == -EEXIST) |
| log_syntax(unit, LOG_DEBUG, filename, line, r, |
| "IPv6 token '%s' is duplicated, ignoring: %m", rvalue); |
| else if (r < 0) |
| log_syntax(unit, LOG_WARNING, filename, line, r, |
| "Failed to store IPv6 token '%s', ignoring: %m", rvalue); |
| else |
| TAKE_PTR(token); |
| |
| return 0; |
| } |
| |
| DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_use_domains, dhcp_use_domains, DHCPUseDomains, |
| "Failed to parse UseDomains= setting"); |
| DEFINE_CONFIG_PARSE_ENUM(config_parse_ipv6_accept_ra_start_dhcp6_client, ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, |
| "Failed to parse DHCPv6Client= setting"); |
| static const char* const ipv6_accept_ra_start_dhcp6_client_table[_IPV6_ACCEPT_RA_START_DHCP6_CLIENT_MAX] = { |
| [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_NO] = "no", |
| [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_ALWAYS] = "always", |
| [IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES] = "yes", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(ipv6_accept_ra_start_dhcp6_client, IPv6AcceptRAStartDHCP6Client, IPV6_ACCEPT_RA_START_DHCP6_CLIENT_YES); |
