/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include "alloc-util.h" #include "firewall-util.h" #include "memory-util.h" #include "netlink-util.h" #include "networkd-address-pool.h" #include "networkd-address.h" #include "networkd-dhcp-server.h" #include "networkd-ipv4acd.h" #include "networkd-manager.h" #include "networkd-netlabel.h" #include "networkd-network.h" #include "networkd-queue.h" #include "networkd-route-util.h" #include "networkd-route.h" #include "parse-util.h" #include "string-util.h" #include "strv.h" #include "strxcpyx.h" #define ADDRESSES_PER_LINK_MAX 2048U #define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U int address_flags_to_string_alloc(uint32_t flags, int family, char **ret) { _cleanup_free_ char *str = NULL; static const char* map[] = { [LOG2U(IFA_F_SECONDARY)] = "secondary", /* This is also called "temporary" for ipv6. */ [LOG2U(IFA_F_NODAD)] = "nodad", [LOG2U(IFA_F_OPTIMISTIC)] = "optimistic", [LOG2U(IFA_F_DADFAILED)] = "dadfailed", [LOG2U(IFA_F_HOMEADDRESS)] = "home-address", [LOG2U(IFA_F_DEPRECATED)] = "deprecated", [LOG2U(IFA_F_TENTATIVE)] = "tentative", [LOG2U(IFA_F_PERMANENT)] = "permanent", [LOG2U(IFA_F_MANAGETEMPADDR)] = "manage-temporary-address", [LOG2U(IFA_F_NOPREFIXROUTE)] = "no-prefixroute", [LOG2U(IFA_F_MCAUTOJOIN)] = "auto-join", [LOG2U(IFA_F_STABLE_PRIVACY)] = "stable-privacy", }; assert(IN_SET(family, AF_INET, AF_INET6)); assert(ret); for (size_t i = 0; i < ELEMENTSOF(map); i++) if (FLAGS_SET(flags, 1 << i) && map[i]) if (!strextend_with_separator( &str, ",", family == AF_INET6 && (1 << i) == IFA_F_SECONDARY ? "temporary" : map[i])) return -ENOMEM; *ret = TAKE_PTR(str); return 0; } int address_new(Address **ret) { _cleanup_(address_freep) Address *address = NULL; address = new(Address, 1); if (!address) return -ENOMEM; *address = (Address) { .family = AF_UNSPEC, .scope = RT_SCOPE_UNIVERSE, .lifetime_valid_usec = USEC_INFINITY, .lifetime_preferred_usec = USEC_INFINITY, .set_broadcast = -1, }; *ret = TAKE_PTR(address); return 0; } static int address_new_static(Network *network, const char *filename, unsigned section_line, Address **ret) { _cleanup_(config_section_freep) ConfigSection *n = NULL; _cleanup_(address_freep) Address *address = NULL; int r; assert(network); assert(ret); assert(filename); assert(section_line > 0); r = config_section_new(filename, section_line, &n); if (r < 0) return r; address = ordered_hashmap_get(network->addresses_by_section, n); if (address) { *ret = TAKE_PTR(address); return 0; } if (ordered_hashmap_size(network->addresses_by_section) >= STATIC_ADDRESSES_PER_NETWORK_MAX) return -E2BIG; r = address_new(&address); if (r < 0) return r; address->network = network; address->section = TAKE_PTR(n); address->source = NETWORK_CONFIG_SOURCE_STATIC; /* This will be adjusted in address_section_verify(). */ address->duplicate_address_detection = _ADDRESS_FAMILY_INVALID; r = ordered_hashmap_ensure_put(&network->addresses_by_section, &config_section_hash_ops, address->section, address); if (r < 0) return r; *ret = TAKE_PTR(address); return 0; } Address *address_free(Address *address) { if (!address) return NULL; if (address->network) { assert(address->section); ordered_hashmap_remove(address->network->addresses_by_section, address->section); } if (address->link) { set_remove(address->link->addresses, address); if (address->family == AF_INET6 && in6_addr_equal(&address->in_addr.in6, &address->link->ipv6ll_address)) memzero(&address->link->ipv6ll_address, sizeof(struct in6_addr)); } sd_ipv4acd_unref(address->acd); config_section_free(address->section); free(address->label); free(address->netlabel); return mfree(address); } static bool address_lifetime_is_valid(const Address *a) { assert(a); return a->lifetime_valid_usec == USEC_INFINITY || a->lifetime_valid_usec > now(CLOCK_BOOTTIME); } bool address_is_ready(const Address *a) { assert(a); if (!ipv4acd_bound(a)) return false; if (FLAGS_SET(a->flags, IFA_F_TENTATIVE)) return false; if (FLAGS_SET(a->state, NETWORK_CONFIG_STATE_REMOVING)) return false; if (!FLAGS_SET(a->state, NETWORK_CONFIG_STATE_CONFIGURED)) return false; return address_lifetime_is_valid(a); } void link_mark_addresses(Link *link, NetworkConfigSource source) { Address *a; assert(link); SET_FOREACH(a, link->addresses) { if (a->source != source) continue; address_mark(a); } } static bool address_needs_to_set_broadcast(const Address *a, Link *link) { assert(a); assert(link); if (a->family != AF_INET) return false; if (in4_addr_is_set(&a->in_addr_peer.in)) return false; /* A /31 or /32 IPv4 address does not have a broadcast address. * See https://tools.ietf.org/html/rfc3021 */ if (a->prefixlen > 30) return false; /* If explicitly configured, do not update the address. */ if (in4_addr_is_set(&a->broadcast)) return false; if (a->set_broadcast >= 0) return a->set_broadcast; /* Defaults to true, except for wireguard, as typical configuration for wireguard does not set * broadcast. */ return !streq_ptr(link->kind, "wireguard"); } void address_set_broadcast(Address *a, Link *link) { assert(a); assert(link); if (!address_needs_to_set_broadcast(a, link)) return; a->broadcast.s_addr = a->in_addr.in.s_addr | htobe32(UINT32_C(0xffffffff) >> a->prefixlen); } static void address_set_cinfo(Manager *m, const Address *a, struct ifa_cacheinfo *cinfo) { usec_t now_usec; assert(m); assert(a); assert(cinfo); assert_se(sd_event_now(m->event, CLOCK_BOOTTIME, &now_usec) >= 0); *cinfo = (struct ifa_cacheinfo) { .ifa_valid = usec_to_sec(a->lifetime_valid_usec, now_usec), .ifa_prefered = usec_to_sec(a->lifetime_preferred_usec, now_usec), }; } static void address_set_lifetime(Manager *m, Address *a, const struct ifa_cacheinfo *cinfo) { usec_t now_usec; assert(m); assert(a); assert(cinfo); assert_se(sd_event_now(m->event, CLOCK_BOOTTIME, &now_usec) >= 0); a->lifetime_valid_usec = sec_to_usec(cinfo->ifa_valid, now_usec); a->lifetime_preferred_usec = sec_to_usec(cinfo->ifa_prefered, now_usec); } static uint32_t address_prefix(const Address *a) { assert(a); /* make sure we don't try to shift by 32. * See ISO/IEC 9899:TC3 ยง 6.5.7.3. */ if (a->prefixlen == 0) return 0; if (a->in_addr_peer.in.s_addr != 0) return be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen); else return be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen); } static void address_kernel_hash_func(const Address *a, struct siphash *state) { assert(a); siphash24_compress(&a->family, sizeof(a->family), state); switch (a->family) { case AF_INET: siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state); uint32_t prefix = address_prefix(a); siphash24_compress(&prefix, sizeof(prefix), state); _fallthrough_; case AF_INET6: siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state); break; default: /* treat any other address family as AF_UNSPEC */ break; } } static int address_kernel_compare_func(const Address *a1, const Address *a2) { int r; r = CMP(a1->family, a2->family); if (r != 0) return r; switch (a1->family) { case AF_INET: /* See kernel's find_matching_ifa() in net/ipv4/devinet.c */ r = CMP(a1->prefixlen, a2->prefixlen); if (r != 0) return r; r = CMP(address_prefix(a1), address_prefix(a2)); if (r != 0) return r; _fallthrough_; case AF_INET6: /* See kernel's ipv6_get_ifaddr() in net/ipv6/addrconf.c */ return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family)); default: /* treat any other address family as AF_UNSPEC */ return 0; } } DEFINE_PRIVATE_HASH_OPS( address_kernel_hash_ops, Address, address_kernel_hash_func, address_kernel_compare_func); DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR( address_kernel_hash_ops_free, Address, address_kernel_hash_func, address_kernel_compare_func, address_free); /* The functions below are mainly used by managing Request. */ static void address_hash_func(const Address *a, struct siphash *state) { assert(a); siphash24_compress(&a->family, sizeof(a->family), state); /* treat any other address family as AF_UNSPEC */ if (!IN_SET(a->family, AF_INET, AF_INET6)) return; siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state); siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state); siphash24_compress(&a->in_addr_peer, FAMILY_ADDRESS_SIZE(a->family), state); if (a->family == AF_INET) { /* On update, the kernel ignores the address label and broadcast address, hence we need * to distinguish addresses with different labels or broadcast addresses. Otherwise, * the label or broadcast address change will not be applied when we reconfigure the * interface. */ siphash24_compress_string(a->label, state); siphash24_compress(&a->broadcast, sizeof(a->broadcast), state); } } int address_compare_func(const Address *a1, const Address *a2) { int r; r = CMP(a1->family, a2->family); if (r != 0) return r; if (!IN_SET(a1->family, AF_INET, AF_INET6)) return 0; r = CMP(a1->prefixlen, a2->prefixlen); if (r != 0) return r; r = memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family)); if (r != 0) return r; r = memcmp(&a1->in_addr_peer, &a2->in_addr_peer, FAMILY_ADDRESS_SIZE(a1->family)); if (r != 0) return r; if (a1->family == AF_INET) { r = strcmp_ptr(a1->label, a2->label); if (r != 0) return r; r = CMP(a1->broadcast.s_addr, a2->broadcast.s_addr); if (r != 0) return r; } return 0; } int address_equal(const Address *a1, const Address *a2) { if (a1 == a2) return true; if (!a1 || !a2) return false; return address_compare_func(a1, a2) == 0; } static int address_equalify(Address *address, const Address *src) { int r; assert(address); assert(src); if (address_kernel_compare_func(address, src) != 0) return -EINVAL; if (address->family == AF_INET) { address->broadcast = src->broadcast; r = free_and_strdup(&address->label, src->label); if (r < 0) return r; } else { address->prefixlen = src->prefixlen; address->in_addr_peer = src->in_addr_peer; } return 0; } int address_dup(const Address *src, Address **ret) { _cleanup_(address_freep) Address *dest = NULL; int r; assert(src); assert(ret); dest = newdup(Address, src, 1); if (!dest) return -ENOMEM; /* clear all pointers */ dest->network = NULL; dest->section = NULL; dest->link = NULL; dest->label = NULL; dest->acd = NULL; dest->netlabel = NULL; if (src->family == AF_INET) { r = free_and_strdup(&dest->label, src->label); if (r < 0) return r; } r = free_and_strdup(&dest->netlabel, src->netlabel); if (r < 0) return r; *ret = TAKE_PTR(dest); return 0; } static int address_set_masquerade(Address *address, bool add) { union in_addr_union masked; int r; assert(address); assert(address->link); if (!address->link->network) return 0; if (address->family == AF_INET && !FLAGS_SET(address->link->network->ip_masquerade, ADDRESS_FAMILY_IPV4)) return 0; if (address->family == AF_INET6 && !FLAGS_SET(address->link->network->ip_masquerade, ADDRESS_FAMILY_IPV6)) return 0; if (address->scope >= RT_SCOPE_LINK) return 0; if (address->ip_masquerade_done == add) return 0; masked = address->in_addr; r = in_addr_mask(address->family, &masked, address->prefixlen); if (r < 0) return r; r = fw_add_masquerade(&address->link->manager->fw_ctx, add, address->family, &masked, address->prefixlen); if (r < 0) return r; address->ip_masquerade_done = add; return 0; } static int address_add(Link *link, Address *address) { int r; assert(link); assert(address); r = set_ensure_put(&link->addresses, &address_kernel_hash_ops_free, address); if (r < 0) return r; if (r == 0) return -EEXIST; address->link = link; return 0; } static int address_update(Address *address) { Link *link; int r; assert(address); assert(address->link); link = address->link; if (address_is_ready(address) && address->family == AF_INET6 && in6_addr_is_link_local(&address->in_addr.in6) && in6_addr_is_null(&link->ipv6ll_address)) { link->ipv6ll_address = address->in_addr.in6; r = link_ipv6ll_gained(link); if (r < 0) return r; } if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 0; r = address_set_masquerade(address, true); if (r < 0) return log_link_warning_errno(link, r, "Could not enable IP masquerading: %m"); address_add_netlabel(address); if (address_is_ready(address) && address->callback) { r = address->callback(address); if (r < 0) return r; } link_update_operstate(link, true); link_check_ready(link); return 0; } static int address_drop(Address *address) { Link *link; bool ready; int r; assert(address); assert(address->link); ready = address_is_ready(address); link = address->link; r = address_set_masquerade(address, false); if (r < 0) log_link_warning_errno(link, r, "Failed to disable IP masquerading, ignoring: %m"); address_del_netlabel(address); if (address->state == 0) address_free(address); link_update_operstate(link, true); if (link && !ready) link_check_ready(link); return 0; } int address_get(Link *link, const Address *in, Address **ret) { Address *existing; assert(link); assert(in); existing = set_get(link->addresses, in); if (!existing) return -ENOENT; if (ret) *ret = existing; return 0; } int link_get_address(Link *link, int family, const union in_addr_union *address, unsigned char prefixlen, Address **ret) { Address *a; int r; assert(link); assert(IN_SET(family, AF_INET, AF_INET6)); assert(address); /* This find an Address object on the link which matches the given address and prefix length * and does not have peer address. When the prefixlen is zero, then an Address object with an * arbitrary prefixlen will be returned. */ if (family == AF_INET6 || prefixlen != 0) { _cleanup_(address_freep) Address *tmp = NULL; /* In this case, we can use address_get(). */ r = address_new(&tmp); if (r < 0) return r; tmp->family = family; tmp->in_addr = *address; tmp->prefixlen = prefixlen; r = address_get(link, tmp, &a); if (r < 0) return r; if (family == AF_INET6) { /* IPv6 addresses are managed without peer address and prefix length. Hence, we need * to check them explicitly. */ if (in_addr_is_set(family, &a->in_addr_peer)) return -ENOENT; if (prefixlen != 0 && a->prefixlen != prefixlen) return -ENOENT; } if (ret) *ret = a; return 0; } SET_FOREACH(a, link->addresses) { if (a->family != family) continue; if (!in_addr_equal(family, &a->in_addr, address)) continue; if (in_addr_is_set(family, &a->in_addr_peer)) continue; if (ret) *ret = a; return 0; } return -ENOENT; } int manager_get_address(Manager *manager, int family, const union in_addr_union *address, unsigned char prefixlen, Address **ret) { Link *link; assert(manager); assert(IN_SET(family, AF_INET, AF_INET6)); assert(address); HASHMAP_FOREACH(link, manager->links_by_index) { if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) continue; if (link_get_address(link, family, address, prefixlen, ret) >= 0) return 0; } return -ENOENT; } bool manager_has_address(Manager *manager, int family, const union in_addr_union *address, bool check_ready) { Address *a; assert(manager); assert(IN_SET(family, AF_INET, AF_INET6)); assert(address); if (manager_get_address(manager, family, address, 0, &a) < 0) return false; return check_ready ? address_is_ready(a) : (address_exists(a) && address_lifetime_is_valid(a)); } const char* format_lifetime(char *buf, size_t l, usec_t lifetime_usec) { assert(buf); assert(l > 4); if (lifetime_usec == USEC_INFINITY) return "forever"; sprintf(buf, "for "); /* format_timespan() never fails */ assert_se(format_timespan(buf + 4, l - 4, usec_sub_unsigned(lifetime_usec, now(CLOCK_BOOTTIME)), USEC_PER_SEC)); return buf; } static void log_address_debug(const Address *address, const char *str, const Link *link) { _cleanup_free_ char *state = NULL, *flags_str = NULL, *scope_str = NULL; assert(address); assert(str); assert(link); if (!DEBUG_LOGGING) return; (void) network_config_state_to_string_alloc(address->state, &state); const char *peer = in_addr_is_set(address->family, &address->in_addr_peer) ? IN_ADDR_TO_STRING(address->family, &address->in_addr_peer) : NULL; (void) address_flags_to_string_alloc(address->flags, address->family, &flags_str); (void) route_scope_to_string_alloc(address->scope, &scope_str); log_link_debug(link, "%s %s address (%s): %s%s%s/%u (valid %s, preferred %s), flags: %s, scope: %s", str, strna(network_config_source_to_string(address->source)), strna(state), IN_ADDR_TO_STRING(address->family, &address->in_addr), peer ? " peer " : "", strempty(peer), address->prefixlen, FORMAT_LIFETIME(address->lifetime_valid_usec), FORMAT_LIFETIME(address->lifetime_preferred_usec), strna(flags_str), strna(scope_str)); } static int address_set_netlink_message(const Address *address, sd_netlink_message *m, Link *link) { uint32_t flags; int r; assert(address); assert(m); assert(link); r = sd_rtnl_message_addr_set_prefixlen(m, address->prefixlen); if (r < 0) return r; /* On remove, only IFA_F_MANAGETEMPADDR flag for IPv6 addresses are used. But anyway, set all * flags except tentative flag here unconditionally. Without setting the flag, the template * addresses generated by kernel will not be removed automatically when the main address is * removed. */ flags = address->flags & ~IFA_F_TENTATIVE; r = sd_rtnl_message_addr_set_flags(m, flags & 0xff); if (r < 0) return r; if ((flags & ~0xff) != 0) { r = sd_netlink_message_append_u32(m, IFA_FLAGS, flags); if (r < 0) return r; } r = netlink_message_append_in_addr_union(m, IFA_LOCAL, address->family, &address->in_addr); if (r < 0) return r; return 0; } static int address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(m); assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 0; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EADDRNOTAVAIL) log_link_message_warning_errno(link, m, r, "Could not drop address"); return 1; } int address_remove(Address *address) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; Link *link; int r; assert(address); assert(IN_SET(address->family, AF_INET, AF_INET6)); assert(address->link); assert(address->link->ifindex > 0); assert(address->link->manager); assert(address->link->manager->rtnl); link = address->link; log_address_debug(address, "Removing", link); r = sd_rtnl_message_new_addr(link->manager->rtnl, &m, RTM_DELADDR, link->ifindex, address->family); if (r < 0) return log_link_warning_errno(link, r, "Could not allocate RTM_DELADDR message: %m"); r = address_set_netlink_message(address, m, link); if (r < 0) return log_link_warning_errno(link, r, "Could not set netlink attributes: %m"); r = netlink_call_async(link->manager->rtnl, NULL, m, address_remove_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_warning_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); address_enter_removing(address); /* The operational state is determined by address state and carrier state. Hence, if we remove * an address, the operational state may be changed. */ link_update_operstate(link, true); return 0; } int address_remove_and_drop(Address *address) { if (!address) return 0; address_cancel_request(address); if (address_exists(address)) return address_remove(address); return address_drop(address); } bool link_address_is_dynamic(const Link *link, const Address *address) { Route *route; assert(link); assert(address); if (address->lifetime_preferred_usec != USEC_INFINITY) return true; /* Even when the address is leased from a DHCP server, networkd assign the address * without lifetime when KeepConfiguration=dhcp. So, let's check that we have * corresponding routes with RTPROT_DHCP. */ SET_FOREACH(route, link->routes) { if (route->source != NETWORK_CONFIG_SOURCE_FOREIGN) continue; /* The route is not assigned yet, or already removed. Ignoring. */ if (!route_exists(route)) continue; if (route->protocol != RTPROT_DHCP) continue; if (address->family != route->family) continue; if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc)) return true; } return false; } int link_drop_ipv6ll_addresses(Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); /* IPv6LL address may be in the tentative state, and in that case networkd has not received it. * So, we need to dump all IPv6 addresses. */ if (link_may_have_ipv6ll(link, /* check_multicast = */ false)) return 0; r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, link->ifindex, AF_INET6); if (r < 0) return r; r = sd_netlink_message_set_request_dump(req, true); if (r < 0) return r; r = sd_netlink_call(link->manager->rtnl, req, 0, &reply); if (r < 0) return r; for (sd_netlink_message *addr = reply; addr; addr = sd_netlink_message_next(addr)) { _cleanup_(address_freep) Address *a = NULL; unsigned char flags, prefixlen; struct in6_addr address; Address *existing; int ifindex; /* NETLINK_GET_STRICT_CHK socket option is supported since kernel 4.20. To support * older kernels, we need to check ifindex here. */ r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex); if (r < 0) { log_link_debug_errno(link, r, "rtnl: received address message without valid ifindex, ignoring: %m"); continue; } else if (link->ifindex != ifindex) continue; r = sd_rtnl_message_addr_get_flags(addr, &flags); if (r < 0) { log_link_debug_errno(link, r, "rtnl: received address message without valid flags, ignoring: %m"); continue; } r = sd_rtnl_message_addr_get_prefixlen(addr, &prefixlen); if (r < 0) { log_link_debug_errno(link, r, "rtnl: received address message without prefixlen, ignoring: %m"); continue; } if (sd_netlink_message_read_in6_addr(addr, IFA_LOCAL, NULL) >= 0) /* address with peer, ignoring. */ continue; r = sd_netlink_message_read_in6_addr(addr, IFA_ADDRESS, &address); if (r < 0) { log_link_debug_errno(link, r, "rtnl: received address message without valid address, ignoring: %m"); continue; } if (!in6_addr_is_link_local(&address)) continue; r = address_new(&a); if (r < 0) return -ENOMEM; a->family = AF_INET6; a->in_addr.in6 = address; a->prefixlen = prefixlen; a->flags = flags; if (address_get(link, a, &existing) < 0) { r = address_add(link, a); if (r < 0) return r; existing = TAKE_PTR(a); } r = address_remove(existing); if (r < 0) return r; } return 0; } int link_drop_foreign_addresses(Link *link) { Address *address; int k, r = 0; assert(link); assert(link->network); /* First, mark all addresses. */ SET_FOREACH(address, link->addresses) { /* We consider IPv6LL addresses to be managed by the kernel, or dropped in link_drop_ipv6ll_addresses() */ if (address->family == AF_INET6 && in6_addr_is_link_local(&address->in_addr.in6)) continue; /* Do not remove localhost address (127.0.0.1 and ::1) */ if (link->flags & IFF_LOOPBACK && in_addr_is_localhost_one(address->family, &address->in_addr) > 0) continue; /* Ignore addresses we configured. */ if (address->source != NETWORK_CONFIG_SOURCE_FOREIGN) continue; /* Ignore addresses not assigned yet or already removing. */ if (!address_exists(address)) continue; /* link_address_is_dynamic() is slightly heavy. Let's call the function only when KeepConfiguration= is set. */ if (IN_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP, KEEP_CONFIGURATION_STATIC) && link_address_is_dynamic(link, address) == (link->network->keep_configuration == KEEP_CONFIGURATION_DHCP)) continue; address_mark(address); } /* Then, unmark requested addresses. */ ORDERED_HASHMAP_FOREACH(address, link->network->addresses_by_section) { Address *existing; /* On update, the kernel ignores the address label and broadcast address. Hence we need to * distinguish addresses with different labels or broadcast addresses. Thus, we need to check * the existing address with address_equal(). Otherwise, the label or broadcast address * change will not be applied when we reconfigure the interface. */ if (address_get(link, address, &existing) >= 0 && address_equal(address, existing)) address_unmark(existing); } /* Finally, remove all marked addresses. */ SET_FOREACH(address, link->addresses) { if (!address_is_marked(address)) continue; k = address_remove(address); if (k < 0 && r >= 0) r = k; } return r; } int link_drop_managed_addresses(Link *link) { Address *address; int k, r = 0; assert(link); SET_FOREACH(address, link->addresses) { /* Do not touch addresses managed by kernel or other tools. */ if (address->source == NETWORK_CONFIG_SOURCE_FOREIGN) continue; /* Ignore addresses not assigned yet or already removing. */ if (!address_exists(address)) continue; k = address_remove(address); if (k < 0 && r >= 0) { r = k; continue; } } return r; } void link_foreignize_addresses(Link *link) { Address *address; assert(link); SET_FOREACH(address, link->addresses) address->source = NETWORK_CONFIG_SOURCE_FOREIGN; } static int address_acquire(Link *link, const Address *original, Address **ret) { _cleanup_(address_freep) Address *na = NULL; union in_addr_union in_addr; int r; assert(link); assert(original); assert(ret); /* Something useful was configured? just use it */ if (in_addr_is_set(original->family, &original->in_addr)) { *ret = NULL; return 0; } /* The address is configured to be 0.0.0.0 or [::] by the user? * Then let's acquire something more useful from the pool. */ r = address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr); if (r < 0) return r; if (r == 0) return -EBUSY; /* Pick first address in range for ourselves. */ if (original->family == AF_INET) in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1); else if (original->family == AF_INET6) in_addr.in6.s6_addr[15] |= 1; r = address_dup(original, &na); if (r < 0) return r; na->in_addr = in_addr; *ret = TAKE_PTR(na); return 1; } int address_configure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) { int r; assert(rtnl); assert(m); assert(link); assert(error_msg); r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, error_msg); link_enter_failed(link); return 0; } return 1; } static int address_configure(const Address *address, const struct ifa_cacheinfo *c, Link *link, Request *req) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; int r; assert(address); assert(IN_SET(address->family, AF_INET, AF_INET6)); assert(c); assert(link); assert(link->ifindex > 0); assert(link->manager); assert(link->manager->rtnl); assert(req); log_address_debug(address, "Configuring", link); r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &m, link->ifindex, address->family); if (r < 0) return r; r = address_set_netlink_message(address, m, link); if (r < 0) return r; r = sd_rtnl_message_addr_set_scope(m, address->scope); if (r < 0) return r; if (in_addr_is_set(address->family, &address->in_addr_peer)) { r = netlink_message_append_in_addr_union(m, IFA_ADDRESS, address->family, &address->in_addr_peer); if (r < 0) return r; } else if (in4_addr_is_set(&address->broadcast)) { r = sd_netlink_message_append_in_addr(m, IFA_BROADCAST, &address->broadcast); if (r < 0) return r; } if (address->family == AF_INET && address->label) { r = sd_netlink_message_append_string(m, IFA_LABEL, address->label); if (r < 0) return r; } r = sd_netlink_message_append_cache_info(m, IFA_CACHEINFO, c); if (r < 0) return r; r = sd_netlink_message_append_u32(m, IFA_RT_PRIORITY, address->route_metric); if (r < 0) return r; return request_call_netlink_async(link->manager->rtnl, m, req); } static bool address_is_ready_to_configure(Link *link, const Address *address) { assert(link); assert(address); if (!link_is_ready_to_configure(link, false)) return false; if (address_is_removing(address)) return false; if (!ipv4acd_bound(address)) return false; /* Refuse adding more than the limit */ if (set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX) return false; return true; } static int address_process_request(Request *req, Link *link, Address *address) { struct ifa_cacheinfo c; int r; assert(req); assert(link); assert(address); if (!address_is_ready_to_configure(link, address)) return 0; address_set_cinfo(link->manager, address, &c); if (c.ifa_valid == 0) { log_link_debug(link, "Refuse to configure %s address %s, as its valid lifetime is zero.", network_config_source_to_string(address->source), IN_ADDR_PREFIX_TO_STRING(address->family, &address->in_addr, address->prefixlen)); address_cancel_requesting(address); return 1; } r = address_configure(address, &c, link, req); if (r < 0) return log_link_warning_errno(link, r, "Failed to configure address: %m"); address_enter_configuring(address); return 1; } int link_request_address( Link *link, Address *address, bool consume_object, unsigned *message_counter, address_netlink_handler_t netlink_handler, Request **ret) { Address *acquired, *existing = NULL; int r; assert(link); assert(address); assert(address->source != NETWORK_CONFIG_SOURCE_FOREIGN); r = address_acquire(link, address, &acquired); if (r < 0) return log_link_warning_errno(link, r, "Failed to acquire an address from pool: %m"); if (r > 0) { if (consume_object) address_free(address); address = acquired; consume_object = true; } if (address_needs_to_set_broadcast(address, link)) { if (!consume_object) { Address *a; r = address_dup(address, &a); if (r < 0) return r; address = a; consume_object = true; } address_set_broadcast(address, link); } (void) address_get(link, address, &existing); if (address->lifetime_valid_usec == 0) { if (consume_object) address_free(address); /* The requested address is outdated. Let's remove it. */ return address_remove_and_drop(existing); } if (!existing) { _cleanup_(address_freep) Address *tmp = NULL; if (consume_object) tmp = address; else { r = address_dup(address, &tmp); if (r < 0) return r; } /* Consider address tentative until we get the real flags from the kernel */ tmp->flags |= IFA_F_TENTATIVE; r = address_add(link, tmp); if (r < 0) return r; existing = TAKE_PTR(tmp); } else { r = address_equalify(existing, address); if (r < 0) return r; existing->source = address->source; existing->provider = address->provider; existing->duplicate_address_detection = address->duplicate_address_detection; existing->lifetime_valid_usec = address->lifetime_valid_usec; existing->lifetime_preferred_usec = address->lifetime_preferred_usec; if (consume_object) address_free(address); } r = ipv4acd_configure(existing); if (r < 0) return r; log_address_debug(existing, "Requesting", link); r = link_queue_request_safe(link, REQUEST_TYPE_ADDRESS, existing, NULL, address_hash_func, address_compare_func, address_process_request, message_counter, netlink_handler, ret); if (r < 0) return log_link_warning_errno(link, r, "Failed to request address: %m"); if (r == 0) return 0; address_enter_requesting(existing); return 1; } static int static_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) { int r; assert(link); r = address_configure_handler_internal(rtnl, m, link, "Failed to set static address"); if (r <= 0) return r; if (link->static_address_messages == 0) { log_link_debug(link, "Addresses set"); link->static_addresses_configured = true; link_check_ready(link); } return 1; } int link_request_static_address(Link *link, Address *address, bool consume) { assert(link); assert(address); assert(address->source == NETWORK_CONFIG_SOURCE_STATIC); return link_request_address(link, address, consume, &link->static_address_messages, static_address_handler, NULL); } int link_request_static_addresses(Link *link) { Address *a; int r; assert(link); assert(link->network); link->static_addresses_configured = false; ORDERED_HASHMAP_FOREACH(a, link->network->addresses_by_section) { r = link_request_static_address(link, a, false); if (r < 0) return r; } r = link_request_radv_addresses(link); if (r < 0) return r; r = link_request_dhcp_server_address(link); if (r < 0) return r; if (link->static_address_messages == 0) { link->static_addresses_configured = true; link_check_ready(link); } else { log_link_debug(link, "Setting addresses"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } void address_cancel_request(Address *address) { Request req; assert(address); assert(address->link); if (!address_is_requesting(address)) return; req = (Request) { .link = address->link, .type = REQUEST_TYPE_ADDRESS, .userdata = address, .hash_func = (hash_func_t) address_hash_func, .compare_func = (compare_func_t) address_compare_func, }; request_detach(address->link->manager, &req); address_cancel_requesting(address); } int manager_rtnl_process_address(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) { _cleanup_(address_freep) Address *tmp = NULL; struct ifa_cacheinfo cinfo; Link *link = NULL; uint16_t type; Address *address = NULL; int ifindex, r; assert(rtnl); assert(message); assert(m); if (sd_netlink_message_is_error(message)) { r = sd_netlink_message_get_errno(message); if (r < 0) log_message_warning_errno(message, r, "rtnl: failed to receive address message, ignoring"); return 0; } r = sd_netlink_message_get_type(message, &type); if (r < 0) { log_warning_errno(r, "rtnl: could not get message type, ignoring: %m"); return 0; } else if (!IN_SET(type, RTM_NEWADDR, RTM_DELADDR)) { log_warning("rtnl: received unexpected message type %u when processing address, ignoring.", type); return 0; } r = sd_rtnl_message_addr_get_ifindex(message, &ifindex); if (r < 0) { log_warning_errno(r, "rtnl: could not get ifindex from message, ignoring: %m"); return 0; } else if (ifindex <= 0) { log_warning("rtnl: received address message with invalid ifindex %d, ignoring.", ifindex); return 0; } r = link_get_by_index(m, ifindex, &link); if (r < 0 || !link) { /* when enumerating we might be out of sync, but we will get the address again, so just * ignore it */ if (!m->enumerating) log_warning("rtnl: received address for link '%d' we don't know about, ignoring.", ifindex); return 0; } r = address_new(&tmp); if (r < 0) return log_oom(); r = sd_rtnl_message_addr_get_family(message, &tmp->family); if (r < 0) { log_link_warning(link, "rtnl: received address message without family, ignoring."); return 0; } else if (!IN_SET(tmp->family, AF_INET, AF_INET6)) { log_link_debug(link, "rtnl: received address message with invalid family '%i', ignoring.", tmp->family); return 0; } r = sd_rtnl_message_addr_get_prefixlen(message, &tmp->prefixlen); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received address message without prefixlen, ignoring: %m"); return 0; } r = sd_rtnl_message_addr_get_scope(message, &tmp->scope); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received address message without scope, ignoring: %m"); return 0; } r = sd_netlink_message_read_u32(message, IFA_FLAGS, &tmp->flags); if (r == -ENODATA) { unsigned char flags; /* For old kernels. */ r = sd_rtnl_message_addr_get_flags(message, &flags); if (r >= 0) tmp->flags = flags; } if (r < 0) { log_link_warning_errno(link, r, "rtnl: received address message without flags, ignoring: %m"); return 0; } switch (tmp->family) { case AF_INET: r = sd_netlink_message_read_in_addr(message, IFA_LOCAL, &tmp->in_addr.in); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received address message without valid address, ignoring: %m"); return 0; } r = sd_netlink_message_read_in_addr(message, IFA_ADDRESS, &tmp->in_addr_peer.in); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: could not get peer address from address message, ignoring: %m"); return 0; } else if (r >= 0) { if (in4_addr_equal(&tmp->in_addr.in, &tmp->in_addr_peer.in)) tmp->in_addr_peer = IN_ADDR_NULL; } r = sd_netlink_message_read_in_addr(message, IFA_BROADCAST, &tmp->broadcast); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: could not get broadcast from address message, ignoring: %m"); return 0; } r = sd_netlink_message_read_string_strdup(message, IFA_LABEL, &tmp->label); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: could not get label from address message, ignoring: %m"); return 0; } else if (r >= 0 && streq_ptr(tmp->label, link->ifname)) tmp->label = mfree(tmp->label); break; case AF_INET6: r = sd_netlink_message_read_in6_addr(message, IFA_LOCAL, &tmp->in_addr.in6); if (r >= 0) { /* Have peer address. */ r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &tmp->in_addr_peer.in6); if (r < 0) { log_link_warning_errno(link, r, "rtnl: could not get peer address from address message, ignoring: %m"); return 0; } } else if (r == -ENODATA) { /* Does not have peer address. */ r = sd_netlink_message_read_in6_addr(message, IFA_ADDRESS, &tmp->in_addr.in6); if (r < 0) { log_link_warning_errno(link, r, "rtnl: received address message without valid address, ignoring: %m"); return 0; } } else { log_link_warning_errno(link, r, "rtnl: could not get local address from address message, ignoring: %m"); return 0; } break; default: assert_not_reached(); } r = sd_netlink_message_read_cache_info(message, IFA_CACHEINFO, &cinfo); if (r < 0 && r != -ENODATA) { log_link_warning_errno(link, r, "rtnl: cannot get IFA_CACHEINFO attribute, ignoring: %m"); return 0; } (void) address_get(link, tmp, &address); switch (type) { case RTM_NEWADDR: if (address) { /* update flags and etc. */ r = address_equalify(address, tmp); if (r < 0) { log_link_warning_errno(link, r, "Failed to update properties of address %s, ignoring: %m", IN_ADDR_PREFIX_TO_STRING(address->family, &address->in_addr, address->prefixlen)); return 0; } address->flags = tmp->flags; address->scope = tmp->scope; address_set_lifetime(m, address, &cinfo); address_enter_configured(address); log_address_debug(address, "Received updated", link); } else { address_set_lifetime(m, tmp, &cinfo); address_enter_configured(tmp); log_address_debug(tmp, "Received new", link); r = address_add(link, tmp); if (r < 0) { log_link_warning_errno(link, r, "Failed to remember foreign address %s, ignoring: %m", IN_ADDR_PREFIX_TO_STRING(tmp->family, &tmp->in_addr, tmp->prefixlen)); return 0; } address = TAKE_PTR(tmp); } /* address_update() logs internally, so we don't need to here. */ r = address_update(address); if (r < 0) link_enter_failed(link); break; case RTM_DELADDR: if (address) { address_enter_removed(address); log_address_debug(address, address->state == 0 ? "Forgetting" : "Removed", link); (void) address_drop(address); } else log_address_debug(tmp, "Kernel removed unknown", link); break; default: assert_not_reached(); } return 1; } int config_parse_broadcast( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; union in_addr_union u; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } if (isempty(rvalue)) { /* The broadcast address will be calculated based on Address=, and set if the link is * not a wireguard interface. Here, we do not check or set n->family. */ n->broadcast = (struct in_addr) {}; n->set_broadcast = -1; TAKE_PTR(n); return 0; } r = parse_boolean(rvalue); if (r >= 0) { /* The broadcast address will be calculated based on Address=. Here, we do not check or * set n->family. */ n->broadcast = (struct in_addr) {}; n->set_broadcast = r; TAKE_PTR(n); return 0; } if (n->family == AF_INET6) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue); return 0; } r = in_addr_from_string(AF_INET, rvalue, &u); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue); return 0; } if (in4_addr_is_null(&u.in)) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Broadcast cannot be ANY address, ignoring assignment: %s", rvalue); return 0; } n->broadcast = u.in; n->set_broadcast = true; n->family = AF_INET; TAKE_PTR(n); return 0; } int config_parse_address( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; union in_addr_union buffer; unsigned char prefixlen; int r, f; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); if (streq(section, "Network")) /* we are not in an Address section, so use line number instead. */ r = address_new_static(network, filename, line, &n); else r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } /* Address=address/prefixlen */ r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_REFUSE, &f, &buffer, &prefixlen); if (r == -ENOANO) { log_syntax(unit, LOG_WARNING, filename, line, r, "An address '%s' is specified without prefix length. " "The behavior of parsing addresses without prefix length will be changed in the future release. " "Please specify prefix length explicitly.", rvalue); r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_LEGACY, &f, &buffer, &prefixlen); } if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid address '%s', ignoring assignment: %m", rvalue); return 0; } if (n->family != AF_UNSPEC && f != n->family) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Address is incompatible, ignoring assignment: %s", rvalue); return 0; } if (in_addr_is_null(f, &buffer)) { /* Will use address from address pool. Note that for ipv6 case, prefix of the address * pool is 8, but 40 bit is used by the global ID and 16 bit by the subnet ID. So, * let's limit the prefix length to 64 or larger. See RFC4193. */ if ((f == AF_INET && prefixlen < 8) || (f == AF_INET6 && prefixlen < 64)) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Null address with invalid prefixlen='%u', ignoring assignment: %s", prefixlen, rvalue); return 0; } } n->family = f; n->prefixlen = prefixlen; if (streq(lvalue, "Address")) n->in_addr = buffer; else n->in_addr_peer = buffer; TAKE_PTR(n); return 0; } int config_parse_label( 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_(address_free_or_set_invalidp) Address *n = NULL; Network *network = userdata; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } if (isempty(rvalue)) { n->label = mfree(n->label); TAKE_PTR(n); return 0; } if (!address_label_valid(rvalue)) { log_syntax(unit, LOG_WARNING, filename, line, 0, "Interface label is too long or invalid, ignoring assignment: %s", rvalue); return 0; } r = free_and_strdup(&n->label, rvalue); if (r < 0) return log_oom(); TAKE_PTR(n); return 0; } int config_parse_lifetime( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; usec_t k; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } /* We accept only "forever", "infinity", empty, or "0". */ if (STR_IN_SET(rvalue, "forever", "infinity", "")) k = USEC_INFINITY; else if (streq(rvalue, "0")) k = 0; else { log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid PreferredLifetime= value, ignoring: %s", rvalue); return 0; } n->lifetime_preferred_usec = k; TAKE_PTR(n); return 0; } int config_parse_address_flags( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } r = parse_boolean(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring: %s", lvalue, rvalue); return 0; } if (streq(lvalue, "AddPrefixRoute")) r = !r; SET_FLAG(n->flags, ltype, r); TAKE_PTR(n); return 0; } int config_parse_address_scope( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } r = route_scope_from_string(rvalue); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue); return 0; } n->scope = r; n->scope_set = true; TAKE_PTR(n); return 0; } int config_parse_address_route_metric( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } r = safe_atou32(rvalue, &n->route_metric); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse %s=, ignoring assignment: %s", lvalue, rvalue); return 0; } TAKE_PTR(n); return 0; } int config_parse_duplicate_address_detection( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } r = parse_boolean(rvalue); if (r >= 0) { log_syntax(unit, LOG_WARNING, filename, line, 0, "For historical reasons, %s=%s means %s=%s. " "Please use 'both', 'ipv4', 'ipv6' or 'none' instead.", lvalue, rvalue, lvalue, r ? "none" : "both"); n->duplicate_address_detection = r ? ADDRESS_FAMILY_NO : ADDRESS_FAMILY_YES; n = NULL; return 0; } AddressFamily a = duplicate_address_detection_address_family_from_string(rvalue); if (a < 0) { log_syntax(unit, LOG_WARNING, filename, line, a, "Failed to parse %s=, ignoring: %s", lvalue, rvalue); return 0; } n->duplicate_address_detection = a; TAKE_PTR(n); return 0; } int config_parse_address_netlabel( 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 = userdata; _cleanup_(address_free_or_set_invalidp) Address *n = NULL; int r; assert(filename); assert(section); assert(lvalue); assert(rvalue); assert(data); assert(network); r = address_new_static(network, filename, section_line, &n); if (r == -ENOMEM) return log_oom(); if (r < 0) { log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to allocate new address, ignoring assignment: %m"); return 0; } r = config_parse_string(unit, filename, line, section, section_line, lvalue, CONFIG_PARSE_STRING_SAFE, rvalue, &n->netlabel, network); if (r < 0) return r; TAKE_PTR(n); return 0; } static int address_section_verify(Address *address) { if (section_is_invalid(address->section)) return -EINVAL; if (address->family == AF_UNSPEC) { assert(address->section); return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "%s: Address section without Address= field configured. " "Ignoring [Address] section from line %u.", address->section->filename, address->section->line); } assert(IN_SET(address->family, AF_INET, AF_INET6)); if (in4_addr_is_set(&address->broadcast) && (address->family == AF_INET6 || address->prefixlen > 30 || in_addr_is_set(address->family, &address->in_addr_peer))) { log_warning("%s: broadcast address is set for an IPv6 address, " "an IPv4 address with peer address, or with prefix length larger than 30. " "Ignoring Broadcast= setting in the [Address] section from line %u.", address->section->filename, address->section->line); address->broadcast.s_addr = 0; } if (address->family == AF_INET6 && address->label) { log_warning("%s: address label is set for IPv6 address in the [Address] section from line %u. " "Ignoring Label= setting.", address->section->filename, address->section->line); address->label = mfree(address->label); } if (!address->scope_set) { if (in_addr_is_localhost(address->family, &address->in_addr) > 0) address->scope = RT_SCOPE_HOST; else if (in_addr_is_link_local(address->family, &address->in_addr) > 0) address->scope = RT_SCOPE_LINK; } if (address->duplicate_address_detection < 0) { if (address->family == AF_INET6) address->duplicate_address_detection = ADDRESS_FAMILY_IPV6; else if (in4_addr_is_link_local(&address->in_addr.in)) address->duplicate_address_detection = ADDRESS_FAMILY_IPV4; else address->duplicate_address_detection = ADDRESS_FAMILY_NO; } else if (address->duplicate_address_detection == ADDRESS_FAMILY_IPV6 && address->family == AF_INET) log_warning("%s: DuplicateAddressDetection=ipv6 is specified for IPv4 address, ignoring.", address->section->filename); else if (address->duplicate_address_detection == ADDRESS_FAMILY_IPV4 && address->family == AF_INET6) log_warning("%s: DuplicateAddressDetection=ipv4 is specified for IPv6 address, ignoring.", address->section->filename); if (address->family == AF_INET6 && !FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV6)) address->flags |= IFA_F_NODAD; return 0; } int network_drop_invalid_addresses(Network *network) { _cleanup_set_free_ Set *addresses = NULL; Address *address; int r; assert(network); ORDERED_HASHMAP_FOREACH(address, network->addresses_by_section) { Address *dup; if (address_section_verify(address) < 0) { /* Drop invalid [Address] sections or Address= settings in [Network]. * Note that address_free() will drop the address from addresses_by_section. */ address_free(address); continue; } /* Always use the setting specified later. So, remove the previously assigned setting. */ dup = set_remove(addresses, address); if (dup) { log_warning("%s: Duplicated address %s is specified at line %u and %u, " "dropping the address setting specified at line %u.", dup->section->filename, IN_ADDR_PREFIX_TO_STRING(address->family, &address->in_addr, address->prefixlen), address->section->line, dup->section->line, dup->section->line); /* address_free() will drop the address from addresses_by_section. */ address_free(dup); } /* Use address_kernel_hash_ops, instead of address_kernel_hash_ops_free. Otherwise, the * Address objects will be freed. */ r = set_ensure_put(&addresses, &address_kernel_hash_ops, address); if (r < 0) return log_oom(); assert(r > 0); } return 0; }