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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <netinet/in.h>
#include <linux/if.h>
#include "network-internal.h"
#include "networkd-address.h"
#include "networkd-ipv4ll.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "parse-util.h"
static int ipv4ll_address_lost(Link *link) {
_cleanup_(address_freep) Address *address = NULL;
struct in_addr addr;
int r;
assert(link);
link->ipv4ll_address = false;
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
if (r < 0)
return 0;
log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
r = address_new(&address);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate address: %m");
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = 16;
address->scope = RT_SCOPE_LINK;
r = address_remove(address, link, NULL);
if (r < 0)
return r;
link_check_ready(link);
return 0;
}
static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
assert(!link->ipv4ll_address);
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "could not set ipv4ll address");
link_enter_failed(link);
return 1;
} else if (r >= 0)
(void) manager_rtnl_process_address(rtnl, m, link->manager);
link->ipv4ll_address = true;
link_check_ready(link);
return 1;
}
static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
_cleanup_(address_freep) Address *ll_addr = NULL;
struct in_addr address;
int r;
assert(ll);
assert(link);
link->ipv4ll_address = false;
r = sd_ipv4ll_get_address(ll, &address);
if (r == -ENOENT)
return 0;
else if (r < 0)
return r;
log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u",
ADDRESS_FMT_VAL(address));
r = address_new(&ll_addr);
if (r < 0)
return r;
ll_addr->family = AF_INET;
ll_addr->in_addr.in = address;
ll_addr->prefixlen = 16;
ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen);
ll_addr->scope = RT_SCOPE_LINK;
r = address_configure(ll_addr, link, ipv4ll_address_handler, false);
if (r < 0)
return r;
return 0;
}
static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) {
Link *link = userdata;
int r;
assert(link);
assert(link->network);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case SD_IPV4LL_EVENT_STOP:
r = ipv4ll_address_lost(link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
case SD_IPV4LL_EVENT_CONFLICT:
r = ipv4ll_address_lost(link);
if (r < 0) {
link_enter_failed(link);
return;
}
r = sd_ipv4ll_restart(ll);
if (r < 0)
log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
break;
case SD_IPV4LL_EVENT_BIND:
r = ipv4ll_address_claimed(ll, link);
if (r < 0) {
log_link_error(link, "Failed to configure ipv4ll address: %m");
link_enter_failed(link);
return;
}
break;
default:
log_link_warning(link, "IPv4 link-local unknown event: %d", event);
break;
}
}
int ipv4ll_configure(Link *link) {
uint64_t seed;
int r;
assert(link);
assert(link->network);
assert(link->network->link_local & (ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4));
if (!link->ipv4ll) {
r = sd_ipv4ll_new(&link->ipv4ll);
if (r < 0)
return r;
r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
if (r < 0)
return r;
}
if (link->sd_device &&
net_get_unique_predictable_data(link->sd_device, true, &seed) >= 0) {
r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
if (r < 0)
return r;
}
r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
if (r < 0)
return r;
r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex);
if (r < 0)
return r;
r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
if (r < 0)
return r;
return 0;
}
int config_parse_ipv4ll(
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) {
AddressFamily *link_local = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
/* Note that this is mostly like
* config_parse_address_family(), except that it
* applies only to IPv4 */
r = parse_boolean(rvalue);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse %s=%s, ignoring assignment. "
"Note that the setting %s= is deprecated, please use LinkLocalAddressing= instead.",
lvalue, rvalue, lvalue);
return 0;
}
SET_FLAG(*link_local, ADDRESS_FAMILY_IPV4, r);
log_syntax(unit, LOG_WARNING, filename, line, 0,
"%s=%s is deprecated, please use LinkLocalAddressing=%s instead.",
lvalue, rvalue, address_family_to_string(*link_local));
return 0;
}
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