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Systemd/src/network/networkd-address.c
Tobias Jungel 30226d2718 networkd: don't remove ip address 
In case networkd is restarted this prevents a removal of an already existing IP
address that would be configured using networkd. With the proposed changes the
IP address will be kept on the interface without removing. This happens only on
physical hosts or VMs since networkd handles interface configuration slightly
different in containers.
2018-11-06 13:26:37 +01:00

946 lines
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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <net/if.h>
#include "alloc-util.h"
#include "conf-parser.h"
#include "firewall-util.h"
#include "netlink-util.h"
#include "networkd-address.h"
#include "networkd-manager.h"
#include "parse-util.h"
#include "set.h"
#include "socket-util.h"
#include "string-util.h"
#include "strv.h"
#include "utf8.h"
#include "util.h"
#define ADDRESSES_PER_LINK_MAX 2048U
#define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U
int address_new(Address **ret) {
_cleanup_(address_freep) 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 = TAKE_PTR(address);
return 0;
}
int address_new_static(Network *network, const char *filename, unsigned section_line, Address **ret) {
_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
_cleanup_(address_freep) Address *address = NULL;
int r;
assert(network);
assert(ret);
assert(!!filename == (section_line > 0));
if (filename) {
r = network_config_section_new(filename, section_line, &n);
if (r < 0)
return r;
address = hashmap_get(network->addresses_by_section, n);
if (address) {
*ret = TAKE_PTR(address);
return 0;
}
}
if (network->n_static_addresses >= STATIC_ADDRESSES_PER_NETWORK_MAX)
return -E2BIG;
r = address_new(&address);
if (r < 0)
return r;
if (filename) {
address->section = TAKE_PTR(n);
r = hashmap_put(network->addresses_by_section, address->section, address);
if (r < 0)
return r;
}
address->network = network;
LIST_APPEND(addresses, network->static_addresses, address);
network->n_static_addresses++;
*ret = TAKE_PTR(address);
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, 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));
}
network_config_section_free(address->section);
free(address->label);
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;
int r;
r = CMP(a1->family, a2->family);
if (r != 0)
return r;
switch (a1->family) {
/* use the same notion of equality as the kernel does */
case AF_INET:
r = CMP(a1->prefixlen, a2->prefixlen);
if (r != 0)
return r;
/* compare the peer prefixes */
if (a1->prefixlen != 0) {
/* make sure we don't try to shift by 32.
* See ISO/IEC 9899:TC3 § 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);
r = CMP(b1, b2);
if (r != 0)
return r;
}
_fallthrough_;
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_freep) 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;
_cleanup_free_ char *b = NULL;
int r;
assert(address);
assert(IN_SET(address->family, AF_INET, AF_INET6));
assert(link);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
if (DEBUG_LOGGING) {
if (in_addr_to_string(address->family, &address->in_addr, &b) >= 0)
log_link_debug(link, "Removing address %s", b);
}
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, NULL, req, callback,
link_netlink_destroy_callback, link, 0, __func__);
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_freep) 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 */
if (original->prefixlen > 30)
broadcast.s_addr = 0;
else
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 = TAKE_PTR(na);
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(IN_SET(address->family, AF_INET, 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) {
if (address->prefixlen <= 30) {
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, NULL, req, callback,
link_netlink_destroy_callback, link, 0, __func__);
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_freep) 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 < 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_freep) 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 treat
* this as the special '0' section */
r = address_new_static(network, NULL, 0, &n);
} else
r = address_new_static(network, filename, section_line, &n);
if (r < 0)
return r;
/* Address=address/prefixlen */
r = in_addr_default_prefix_from_string_auto(rvalue, &f, &buffer, &prefixlen);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Invalid address '%s', ignoring assignment: %m", rvalue);
return 0;
}
if (n->family != AF_UNSPEC && f != n->family) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", rvalue);
return 0;
}
n->family = f;
n->prefixlen = prefixlen;
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_freep) 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 < 0)
return r;
if (!address_label_valid(rvalue)) {
log_syntax(unit, LOG_ERR, 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();
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_freep) Address *n = NULL;
unsigned k;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_new_static(network, filename, 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_freep) 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 < 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;
}
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_freep) 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 < 0)
return r;
if (streq(rvalue, "host"))
n->scope = RT_SCOPE_HOST;
else if (streq(rvalue, "link"))
n->scope = RT_SCOPE_LINK;
else if (streq(rvalue, "global"))
n->scope = RT_SCOPE_UNIVERSE;
else {
r = safe_atou8(rvalue , &n->scope);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
return 0;
}
}
n = NULL;
return 0;
}
bool address_is_ready(const Address *a) {
assert(a);
if (a->family == AF_INET6)
return !(a->flags & IFA_F_TENTATIVE);
else
return !(a->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED));
}
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