diff options
Diffstat (limited to 'src/grp-network/libnetworkd-core/networkd-address.c')
| -rw-r--r-- | src/grp-network/libnetworkd-core/networkd-address.c | 923 |
1 files changed, 923 insertions, 0 deletions
diff --git a/src/grp-network/libnetworkd-core/networkd-address.c b/src/grp-network/libnetworkd-core/networkd-address.c new file mode 100644 index 0000000000..e91744f3e0 --- /dev/null +++ b/src/grp-network/libnetworkd-core/networkd-address.c @@ -0,0 +1,923 @@ +/*** + This file is part of systemd. + + Copyright 2013 Tom Gundersen <teg@jklm.no> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <net/if.h> + +#include "sd-netlink/netlink-util.h" +#include "systemd-basic/alloc-util.h" +#include "systemd-basic/parse-util.h" +#include "systemd-basic/set.h" +#include "systemd-basic/socket-util.h" +#include "systemd-basic/string-util.h" +#include "systemd-basic/utf8.h" +#include "systemd-basic/util.h" +#include "systemd-firewall/firewall-util.h" +#include "systemd-shared/conf-parser.h" + +#include "networkd-address.h" +#include "networkd.h" + +#define ADDRESSES_PER_LINK_MAX 2048U +#define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U + +int address_new(Address **ret) { + _cleanup_address_free_ Address *address = NULL; + + address = new0(Address, 1); + if (!address) + return -ENOMEM; + + address->family = AF_UNSPEC; + address->scope = RT_SCOPE_UNIVERSE; + address->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME; + address->cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME; + + *ret = address; + address = NULL; + + return 0; +} + +int address_new_static(Network *network, unsigned section, Address **ret) { + _cleanup_address_free_ Address *address = NULL; + int r; + + assert(network); + assert(ret); + + if (section) { + address = hashmap_get(network->addresses_by_section, UINT_TO_PTR(section)); + if (address) { + *ret = address; + address = NULL; + + return 0; + } + } + + if (network->n_static_addresses >= STATIC_ADDRESSES_PER_NETWORK_MAX) + return -E2BIG; + + r = address_new(&address); + if (r < 0) + return r; + + if (section) { + address->section = section; + hashmap_put(network->addresses_by_section, UINT_TO_PTR(address->section), address); + } + + address->network = network; + LIST_APPEND(addresses, network->static_addresses, address); + network->n_static_addresses++; + + *ret = address; + address = NULL; + + return 0; +} + +void address_free(Address *address) { + if (!address) + return; + + if (address->network) { + LIST_REMOVE(addresses, address->network->static_addresses, address); + assert(address->network->n_static_addresses > 0); + address->network->n_static_addresses--; + + if (address->section) + hashmap_remove(address->network->addresses_by_section, UINT_TO_PTR(address->section)); + } + + if (address->link) { + set_remove(address->link->addresses, address); + set_remove(address->link->addresses_foreign, address); + + if (in_addr_equal(AF_INET6, &address->in_addr, (const union in_addr_union *) &address->link->ipv6ll_address)) + memzero(&address->link->ipv6ll_address, sizeof(struct in6_addr)); + } + + free(address); +} + +static void address_hash_func(const void *b, struct siphash *state) { + const Address *a = b; + + assert(a); + + siphash24_compress(&a->family, sizeof(a->family), state); + + switch (a->family) { + case AF_INET: + siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state); + + /* peer prefix */ + if (a->prefixlen != 0) { + uint32_t prefix; + + if (a->in_addr_peer.in.s_addr != 0) + prefix = be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen); + else + prefix = be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen); + + siphash24_compress(&prefix, sizeof(prefix), state); + } + + /* fallthrough */ + case AF_INET6: + /* local address */ + 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_compare_func(const void *c1, const void *c2) { + const Address *a1 = c1, *a2 = c2; + + if (a1->family < a2->family) + return -1; + if (a1->family > a2->family) + return 1; + + switch (a1->family) { + /* use the same notion of equality as the kernel does */ + case AF_INET: + if (a1->prefixlen < a2->prefixlen) + return -1; + if (a1->prefixlen > a2->prefixlen) + return 1; + + /* compare the peer prefixes */ + if (a1->prefixlen != 0) { + /* make sure we don't try to shift by 32. + * See ISO/IEC 9899:TC3 ยง 6.5.7.3. */ + uint32_t b1, b2; + + if (a1->in_addr_peer.in.s_addr != 0) + b1 = be32toh(a1->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen); + else + b1 = be32toh(a1->in_addr.in.s_addr) >> (32 - a1->prefixlen); + + if (a2->in_addr_peer.in.s_addr != 0) + b2 = be32toh(a2->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen); + else + b2 = be32toh(a2->in_addr.in.s_addr) >> (32 - a1->prefixlen); + + if (b1 < b2) + return -1; + if (b1 > b2) + return 1; + } + + /* fall-through */ + case AF_INET6: + return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family)); + default: + /* treat any other address family as AF_UNSPEC */ + return 0; + } +} + +static const struct hash_ops address_hash_ops = { + .hash = address_hash_func, + .compare = address_compare_func +}; + +bool address_equal(Address *a1, Address *a2) { + if (a1 == a2) + return true; + + if (!a1 || !a2) + return false; + + return address_compare_func(a1, a2) == 0; +} + +static int address_establish(Address *address, Link *link) { + bool masq; + int r; + + assert(address); + assert(link); + + masq = link->network && + link->network->ip_masquerade && + address->family == AF_INET && + address->scope < RT_SCOPE_LINK; + + /* Add firewall entry if this is requested */ + if (address->ip_masquerade_done != masq) { + union in_addr_union masked = address->in_addr; + in_addr_mask(address->family, &masked, address->prefixlen); + + r = fw_add_masquerade(masq, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0); + if (r < 0) + log_link_warning_errno(link, r, "Could not enable IP masquerading: %m"); + + address->ip_masquerade_done = masq; + } + + return 0; +} + +static int address_add_internal(Link *link, Set **addresses, + int family, + const union in_addr_union *in_addr, + unsigned char prefixlen, + Address **ret) { + _cleanup_address_free_ Address *address = NULL; + int r; + + assert(link); + assert(addresses); + assert(in_addr); + + r = address_new(&address); + if (r < 0) + return r; + + address->family = family; + address->in_addr = *in_addr; + address->prefixlen = prefixlen; + /* Consider address tentative until we get the real flags from the kernel */ + address->flags = IFA_F_TENTATIVE; + + r = set_ensure_allocated(addresses, &address_hash_ops); + if (r < 0) + return r; + + r = set_put(*addresses, address); + if (r < 0) + return r; + + address->link = link; + + if (ret) + *ret = address; + + address = NULL; + + return 0; +} + +int address_add_foreign(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) { + return address_add_internal(link, &link->addresses_foreign, family, in_addr, prefixlen, ret); +} + +int address_add(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) { + Address *address; + int r; + + r = address_get(link, family, in_addr, prefixlen, &address); + if (r == -ENOENT) { + /* Address does not exist, create a new one */ + r = address_add_internal(link, &link->addresses, family, in_addr, prefixlen, &address); + if (r < 0) + return r; + } else if (r == 0) { + /* Take over a foreign address */ + r = set_ensure_allocated(&link->addresses, &address_hash_ops); + if (r < 0) + return r; + + r = set_put(link->addresses, address); + if (r < 0) + return r; + + set_remove(link->addresses_foreign, address); + } else if (r == 1) { + /* Already exists, do nothing */ + ; + } else + return r; + + if (ret) + *ret = address; + + return 0; +} + +static int address_release(Address *address) { + int r; + + assert(address); + assert(address->link); + + /* Remove masquerading firewall entry if it was added */ + if (address->ip_masquerade_done) { + union in_addr_union masked = address->in_addr; + in_addr_mask(address->family, &masked, address->prefixlen); + + r = fw_add_masquerade(false, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0); + if (r < 0) + log_link_warning_errno(address->link, r, "Failed to disable IP masquerading: %m"); + + address->ip_masquerade_done = false; + } + + return 0; +} + +int address_update( + Address *address, + unsigned char flags, + unsigned char scope, + const struct ifa_cacheinfo *cinfo) { + + bool ready; + int r; + + assert(address); + assert(cinfo); + assert_return(address->link, 1); + + if (IN_SET(address->link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + ready = address_is_ready(address); + + address->flags = flags; + address->scope = scope; + address->cinfo = *cinfo; + + link_update_operstate(address->link); + + if (!ready && address_is_ready(address)) { + link_check_ready(address->link); + + if (address->family == AF_INET6 && + in_addr_is_link_local(AF_INET6, &address->in_addr) > 0 && + in_addr_is_null(AF_INET6, (const union in_addr_union*) &address->link->ipv6ll_address) > 0) { + + r = link_ipv6ll_gained(address->link, &address->in_addr.in6); + if (r < 0) + return r; + } + } + + return 0; +} + +int address_drop(Address *address) { + Link *link; + bool ready; + + assert(address); + + ready = address_is_ready(address); + link = address->link; + + address_release(address); + address_free(address); + + link_update_operstate(link); + + if (link && !ready) + link_check_ready(link); + + return 0; +} + +int address_get(Link *link, + int family, + const union in_addr_union *in_addr, + unsigned char prefixlen, + Address **ret) { + + Address address, *existing; + + assert(link); + assert(in_addr); + + address = (Address) { + .family = family, + .in_addr = *in_addr, + .prefixlen = prefixlen, + }; + + existing = set_get(link->addresses, &address); + if (existing) { + if (ret) + *ret = existing; + return 1; + } + + existing = set_get(link->addresses_foreign, &address); + if (existing) { + if (ret) + *ret = existing; + return 0; + } + + return -ENOENT; +} + +int address_remove( + Address *address, + Link *link, + sd_netlink_message_handler_t callback) { + + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(address); + assert(address->family == AF_INET || address->family == AF_INET6); + assert(link); + assert(link->ifindex > 0); + assert(link->manager); + assert(link->manager->rtnl); + + r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR, + link->ifindex, address->family); + if (r < 0) + return log_error_errno(r, "Could not allocate RTM_DELADDR message: %m"); + + r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen); + if (r < 0) + return log_error_errno(r, "Could not set prefixlen: %m"); + + if (address->family == AF_INET) + r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in); + else if (address->family == AF_INET6) + r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6); + if (r < 0) + return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m"); + + r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL); + if (r < 0) + return log_error_errno(r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} + +static int address_acquire(Link *link, Address *original, Address **ret) { + union in_addr_union in_addr = {}; + struct in_addr broadcast = {}; + _cleanup_address_free_ Address *na = NULL; + int r; + + assert(link); + assert(original); + assert(ret); + + /* Something useful was configured? just use it */ + if (in_addr_is_null(original->family, &original->in_addr) <= 0) + 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 = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr); + if (r < 0) + return log_link_error_errno(link, r, "Failed to acquire address from pool: %m"); + if (r == 0) { + log_link_error(link, "Couldn't find free address for interface, all taken."); + return -EBUSY; + } + + if (original->family == AF_INET) { + /* Pick first address in range for ourselves ... */ + in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1); + + /* .. and use last as broadcast address */ + broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen); + } else if (original->family == AF_INET6) + in_addr.in6.s6_addr[15] |= 1; + + r = address_new(&na); + if (r < 0) + return r; + + na->family = original->family; + na->prefixlen = original->prefixlen; + na->scope = original->scope; + na->cinfo = original->cinfo; + + if (original->label) { + na->label = strdup(original->label); + if (!na->label) + return -ENOMEM; + } + + na->broadcast = broadcast; + na->in_addr = in_addr; + + LIST_PREPEND(addresses, link->pool_addresses, na); + + *ret = na; + na = NULL; + + return 0; +} + +int address_configure( + Address *address, + Link *link, + sd_netlink_message_handler_t callback, + bool update) { + + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(address); + assert(address->family == AF_INET || address->family == AF_INET6); + assert(link); + assert(link->ifindex > 0); + assert(link->manager); + assert(link->manager->rtnl); + + /* If this is a new address, then refuse adding more than the limit */ + if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 && + set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX) + return -E2BIG; + + r = address_acquire(link, address, &address); + if (r < 0) + return r; + + if (update) + r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req, + link->ifindex, address->family); + else + r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR, + link->ifindex, address->family); + if (r < 0) + return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m"); + + r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen); + if (r < 0) + return log_error_errno(r, "Could not set prefixlen: %m"); + + address->flags |= IFA_F_PERMANENT; + + if (address->home_address) + address->flags |= IFA_F_HOMEADDRESS; + + if (address->duplicate_address_detection) + address->flags |= IFA_F_NODAD; + + if (address->manage_temporary_address) + address->flags |= IFA_F_MANAGETEMPADDR; + + if (address->prefix_route) + address->flags |= IFA_F_NOPREFIXROUTE; + + if (address->autojoin) + address->flags |= IFA_F_MCAUTOJOIN; + + r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff)); + if (r < 0) + return log_error_errno(r, "Could not set flags: %m"); + + if (address->flags & ~0xff) { + r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags); + if (r < 0) + return log_error_errno(r, "Could not set extended flags: %m"); + } + + r = sd_rtnl_message_addr_set_scope(req, address->scope); + if (r < 0) + return log_error_errno(r, "Could not set scope: %m"); + + if (address->family == AF_INET) + r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in); + else if (address->family == AF_INET6) + r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6); + if (r < 0) + return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m"); + + if (!in_addr_is_null(address->family, &address->in_addr_peer)) { + if (address->family == AF_INET) + r = sd_netlink_message_append_in_addr(req, IFA_ADDRESS, &address->in_addr_peer.in); + else if (address->family == AF_INET6) + r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &address->in_addr_peer.in6); + if (r < 0) + return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m"); + } else { + if (address->family == AF_INET) { + r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast); + if (r < 0) + return log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m"); + } + } + + if (address->label) { + r = sd_netlink_message_append_string(req, IFA_LABEL, address->label); + if (r < 0) + return log_error_errno(r, "Could not append IFA_LABEL attribute: %m"); + } + + r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO, + &address->cinfo); + if (r < 0) + return log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m"); + + r = address_establish(address, link); + if (r < 0) + return r; + + r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL); + if (r < 0) { + address_release(address); + return log_error_errno(r, "Could not send rtnetlink message: %m"); + } + + link_ref(link); + + r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL); + if (r < 0) { + address_release(address); + return log_error_errno(r, "Could not add address: %m"); + } + + return 0; +} + +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_ Address *n = NULL; + int r; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + r = address_new_static(network, section_line, &n); + if (r < 0) + return r; + + if (n->family == AF_INET6) { + log_syntax(unit, LOG_ERR, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue); + return 0; + } + + r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue); + return 0; + } + + n->family = AF_INET; + n = NULL; + + 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_ Address *n = NULL; + const char *address, *e; + union in_addr_union buffer; + 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 treat + * this as the special '0' section */ + section_line = 0; + } + + r = address_new_static(network, section_line, &n); + if (r < 0) + return r; + + /* Address=address/prefixlen */ + + /* prefixlen */ + e = strchr(rvalue, '/'); + if (e) { + unsigned i; + + r = safe_atou(e + 1, &i); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is invalid, ignoring assignment: %s", e + 1); + return 0; + } + + n->prefixlen = (unsigned char) i; + + address = strndupa(rvalue, e - rvalue); + } else + address = rvalue; + + r = in_addr_from_string_auto(address, &f, &buffer); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Address is invalid, ignoring assignment: %s", address); + return 0; + } + + if (!e && f == AF_INET) { + r = in_addr_default_prefixlen(&buffer.in, &n->prefixlen); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length not specified, and a default one can not be deduced for '%s', ignoring assignment", address); + return 0; + } + } + + if (n->family != AF_UNSPEC && f != n->family) { + log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", address); + return 0; + } + + n->family = f; + + if (streq(lvalue, "Address")) + n->in_addr = buffer; + else + n->in_addr_peer = buffer; + + if (n->family == AF_INET && n->broadcast.s_addr == 0) + n->broadcast.s_addr = n->in_addr.in.s_addr | htonl(0xfffffffflu >> n->prefixlen); + + n = NULL; + + 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_ Address *n = NULL; + Network *network = userdata; + int r; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + r = address_new_static(network, section_line, &n); + if (r < 0) + return r; + + if (!ifname_valid(rvalue)) { + log_syntax(unit, LOG_ERR, filename, line, 0, "Interface label is not valid or too long, ignoring assignment: %s", rvalue); + return 0; + } + + r = free_and_strdup(&n->label, rvalue); + if (r < 0) + return log_oom(); + + n = NULL; + + 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_ Address *n = NULL; + unsigned k; + int r; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + r = address_new_static(network, section_line, &n); + if (r < 0) + return r; + + if (STR_IN_SET(rvalue, "forever", "infinity")) { + n->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME; + n = NULL; + + return 0; + } + + r = safe_atou(rvalue, &k); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse PreferredLifetime, ignoring: %s", rvalue); + return 0; + } + + if (k != 0) + log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid PreferredLifetime value, ignoring: %d", k); + else { + n->cinfo.ifa_prefered = k; + n = NULL; + } + + 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_ Address *n = NULL; + int r; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + r = address_new_static(network, section_line, &n); + if (r < 0) + return r; + + r = parse_boolean(rvalue); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue); + return 0; + } + + if (streq(lvalue, "HomeAddress")) + n->home_address = r; + else if (streq(lvalue, "DuplicateAddressDetection")) + n->duplicate_address_detection = r; + else if (streq(lvalue, "ManageTemporaryAddress")) + n->manage_temporary_address = r; + else if (streq(lvalue, "PrefixRoute")) + n->prefix_route = r; + else if (streq(lvalue, "AutoJoin")) + n->autojoin = r; + + return 0; +} + +bool address_is_ready(const Address *a) { + assert(a); + + return !(a->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED)); +} |