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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <net/if.h>
#include <net/if_arp.h>
#include <unistd.h>
#include "fd-util.h"
#include "fileio.h"
#include "networkd-link.h"
#include "networkd-lldp-rx.h"
#include "networkd-lldp-tx.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "tmpfile-util.h"
DEFINE_CONFIG_PARSE_ENUM(config_parse_lldp_mode, lldp_mode, LLDPMode, "Failed to parse LLDP= setting.");
static const char* const lldp_mode_table[_LLDP_MODE_MAX] = {
[LLDP_MODE_NO] = "no",
[LLDP_MODE_YES] = "yes",
[LLDP_MODE_ROUTERS_ONLY] = "routers-only",
};
DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(lldp_mode, LLDPMode, LLDP_MODE_YES);
static bool link_lldp_rx_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (link->iftype != ARPHRD_ETHER)
return false;
if (!link->network)
return false;
/* LLDP should be handled on bridge and bond slaves as those have a direct connection to their peers,
* not on the bridge/bond master. Linux doesn't even (by default) forward lldp packets to the bridge
* master.*/
if (link->kind && STR_IN_SET(link->kind, "bridge", "bond"))
return false;
return link->network->lldp_mode != LLDP_MODE_NO;
}
static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
Link *link = userdata;
int r;
assert(link);
(void) link_lldp_save(link);
if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
/* If we received information about a new neighbor, restart the LLDP "fast" logic */
log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
r = link_lldp_emit_start(link);
if (r < 0)
log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
}
}
int link_lldp_rx_configure(Link *link) {
int r;
if (!link_lldp_rx_enabled(link))
return 0;
if (!link->lldp) {
r = sd_lldp_new(&link->lldp);
if (r < 0)
return r;
r = sd_lldp_attach_event(link->lldp, link->manager->event, 0);
if (r < 0)
return r;
}
r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
if (r < 0)
return r;
r = sd_lldp_match_capabilities(link->lldp,
link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
SD_LLDP_SYSTEM_CAPABILITIES_ALL);
if (r < 0)
return r;
r = sd_lldp_set_filter_address(link->lldp, &link->hw_addr.addr.ether);
if (r < 0)
return r;
r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
if (r < 0)
return r;
r = link_update_lldp(link);
if (r < 0)
return r;
return 0;
}
int link_update_lldp(Link *link) {
int r;
assert(link);
if (!link->lldp)
return 0;
if (link->flags & IFF_UP) {
r = sd_lldp_start(link->lldp);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start LLDP: %m");
if (r > 0)
log_link_debug(link, "Started LLDP.");
} else {
r = sd_lldp_stop(link->lldp);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to stop LLDP: %m");
if (r > 0)
log_link_debug(link, "Stopped LLDP.");
}
return r;
}
int link_lldp_save(Link *link) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
sd_lldp_neighbor **l = NULL;
int n = 0, r, i;
assert(link);
assert(link->lldp_file);
if (!link->lldp) {
(void) unlink(link->lldp_file);
return 0;
}
r = sd_lldp_get_neighbors(link->lldp, &l);
if (r < 0)
goto finish;
if (r == 0) {
(void) unlink(link->lldp_file);
goto finish;
}
n = r;
r = fopen_temporary(link->lldp_file, &f, &temp_path);
if (r < 0)
goto finish;
fchmod(fileno(f), 0644);
for (i = 0; i < n; i++) {
const void *p;
le64_t u;
size_t sz;
r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
if (r < 0)
goto finish;
u = htole64(sz);
(void) fwrite(&u, 1, sizeof(u), f);
(void) fwrite(p, 1, sz, f);
}
r = fflush_and_check(f);
if (r < 0)
goto finish;
if (rename(temp_path, link->lldp_file) < 0) {
r = -errno;
goto finish;
}
finish:
if (r < 0) {
(void) unlink(link->lldp_file);
if (temp_path)
(void) unlink(temp_path);
log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
}
if (l) {
for (i = 0; i < n; i++)
sd_lldp_neighbor_unref(l[i]);
free(l);
}
return r;
}
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