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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <net/if.h>
#include <linux/if_addrlabel.h>
#include "alloc-util.h"
#include "netlink-util.h"
#include "networkd-address-label.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "parse-util.h"
AddressLabel *address_label_free(AddressLabel *label) {
if (!label)
return NULL;
if (label->network) {
assert(label->section);
hashmap_remove(label->network->address_labels_by_section, label->section);
}
network_config_section_free(label->section);
return mfree(label);
}
DEFINE_NETWORK_SECTION_FUNCTIONS(AddressLabel, address_label_free);
static int address_label_new_static(Network *network, const char *filename, unsigned section_line, AddressLabel **ret) {
_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
_cleanup_(address_label_freep) AddressLabel *label = NULL;
int r;
assert(network);
assert(ret);
assert(filename);
assert(section_line > 0);
r = network_config_section_new(filename, section_line, &n);
if (r < 0)
return r;
label = hashmap_get(network->address_labels_by_section, n);
if (label) {
*ret = TAKE_PTR(label);
return 0;
}
label = new(AddressLabel, 1);
if (!label)
return -ENOMEM;
*label = (AddressLabel) {
.network = network,
.section = TAKE_PTR(n),
};
r = hashmap_ensure_allocated(&network->address_labels_by_section, &network_config_hash_ops);
if (r < 0)
return r;
r = hashmap_put(network->address_labels_by_section, label->section, label);
if (r < 0)
return r;
*ret = TAKE_PTR(label);
return 0;
}
static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(rtnl);
assert(m);
assert(link);
assert(link->ifname);
assert(link->address_label_messages > 0);
link->address_label_messages--;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Could not set address label");
link_enter_failed(link);
return 1;
} else if (r >= 0)
(void) manager_rtnl_process_address(rtnl, m, link->manager);
if (link->address_label_messages == 0)
log_link_debug(link, "Addresses label set");
return 1;
}
static int address_label_configure(AddressLabel *label, Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(label);
assert(link);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
r = sd_rtnl_message_new_addrlabel(link->manager->rtnl, &req, RTM_NEWADDRLABEL,
link->ifindex, AF_INET6);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate RTM_NEWADDR message: %m");
r = sd_rtnl_message_addrlabel_set_prefixlen(req, label->prefixlen);
if (r < 0)
return log_link_error_errno(link, r, "Could not set prefixlen: %m");
r = sd_netlink_message_append_u32(req, IFAL_LABEL, label->label);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFAL_LABEL attribute: %m");
r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &label->in_addr.in6);
if (r < 0)
return log_link_error_errno(link, r, "Could not append IFA_ADDRESS attribute: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req,
address_label_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
int link_set_address_labels(Link *link) {
AddressLabel *label;
int r;
assert(link);
assert(link->network);
HASHMAP_FOREACH(label, link->network->address_labels_by_section) {
r = address_label_configure(label, link);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set address label: %m");
link->address_label_messages++;
}
return 0;
}
void network_drop_invalid_address_labels(Network *network) {
AddressLabel *label;
assert(network);
HASHMAP_FOREACH(label, network->address_labels_by_section)
if (section_is_invalid(label->section))
address_label_free(label);
}
int config_parse_address_label_prefix(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_label_free_or_set_invalidp) AddressLabel *n = NULL;
Network *network = userdata;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_label_new_static(network, filename, section_line, &n);
if (r < 0)
return log_oom();
r = in_addr_prefix_from_string(rvalue, AF_INET6, &n->in_addr, &n->prefixlen);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Address label is invalid, ignoring assignment: %s", rvalue);
return 0;
}
TAKE_PTR(n);
return 0;
}
int config_parse_address_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_label_free_or_set_invalidp) AddressLabel *n = NULL;
Network *network = userdata;
uint32_t k;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_label_new_static(network, filename, section_line, &n);
if (r < 0)
return log_oom();
r = safe_atou32(rvalue, &k);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse address label, ignoring: %s", rvalue);
return 0;
}
if (k == 0xffffffffUL) {
log_syntax(unit, LOG_WARNING, filename, line, 0, "Address label is invalid, ignoring: %s", rvalue);
return 0;
}
n->label = k;
TAKE_PTR(n);
return 0;
}
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