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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-manager.h"
#include "networkd-link.h"
static int ipv4ll_address_lost(Link *link) {
_cleanup_(address_freep) Address *address = NULL;
_cleanup_(route_freep) Route *route = NULL;
struct in_addr addr;
int r;
assert(link);
link->ipv4ll_route = false;
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;
address_remove(address, link, NULL);
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->priority = IPV4LL_ROUTE_METRIC;
route_remove(route, link, NULL);
link_check_ready(link);
return 0;
}
static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
assert(!link->ipv4ll_route);
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_error_errno(link, r, "could not set ipv4ll route: %m");
link_enter_failed(link);
}
link->ipv4ll_route = true;
link_check_ready(link);
return 1;
}
static int ipv4ll_route_configure(Link *link) {
_cleanup_(route_freep) Route *route = NULL;
int r;
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->protocol = RTPROT_STATIC;
route->priority = IPV4LL_ROUTE_METRIC;
route->table = link_get_vrf_table(link);
return route_configure(route, link, ipv4ll_route_handler);
}
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_error_errno(link, r, "could not set ipv4ll address: %m");
link_enter_failed(link);
} else if (r >= 0)
manager_rtnl_process_address(rtnl, m, link->manager);
link->ipv4ll_address = true;
r = ipv4ll_route_configure(link);
if (r < 0) {
log_link_error_errno(link, r, "Failed to configure ipv4ll route: %m");
link_enter_failed(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;
link->ipv4ll_route = 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;
}
if (link->sd_device &&
net_get_unique_predictable_data(link->sd_device, &seed) >= 0) {
r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
if (r < 0)
return r;
}
r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
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;
}
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