2019-05-09 07:21:55 +02:00
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <net/if.h>
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2019-07-24 11:22:43 +02:00
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#include <net/if_arp.h>
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2019-05-09 07:21:55 +02:00
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#include <unistd.h>
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#include "fd-util.h"
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#include "fileio.h"
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#include "networkd-link.h"
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#include "networkd-lldp-rx.h"
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#include "networkd-lldp-tx.h"
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#include "networkd-network.h"
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#include "string-table.h"
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#include "string-util.h"
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2020-04-23 15:18:18 +02:00
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#include "strv.h"
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2019-05-09 07:21:55 +02:00
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#include "tmpfile-util.h"
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DEFINE_CONFIG_PARSE_ENUM(config_parse_lldp_mode, lldp_mode, LLDPMode, "Failed to parse LLDP= setting.");
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static const char* const lldp_mode_table[_LLDP_MODE_MAX] = {
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[LLDP_MODE_NO] = "no",
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[LLDP_MODE_YES] = "yes",
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[LLDP_MODE_ROUTERS_ONLY] = "routers-only",
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};
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DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(lldp_mode, LLDPMode, LLDP_MODE_YES);
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bool link_lldp_rx_enabled(Link *link) {
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assert(link);
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if (link->flags & IFF_LOOPBACK)
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return false;
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if (link->iftype != ARPHRD_ETHER)
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return false;
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if (!link->network)
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return false;
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2020-04-23 15:18:18 +02:00
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/* LLDP should be handled on bridge and bond slaves as those have a direct connection to their peers,
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* not on the bridge/bond master. Linux doesn't even (by default) forward lldp packets to the bridge
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* master.*/
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if (link->kind && STR_IN_SET(link->kind, "bridge", "bond"))
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2019-05-09 07:21:55 +02:00
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return false;
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return link->network->lldp_mode != LLDP_MODE_NO;
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}
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static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
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Link *link = userdata;
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int r;
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assert(link);
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(void) link_lldp_save(link);
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if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
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/* If we received information about a new neighbor, restart the LLDP "fast" logic */
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log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
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r = link_lldp_emit_start(link);
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if (r < 0)
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log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
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}
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}
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int link_lldp_rx_configure(Link *link) {
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int r;
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r = sd_lldp_new(&link->lldp);
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if (r < 0)
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return r;
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r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
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if (r < 0)
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return r;
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r = sd_lldp_match_capabilities(link->lldp,
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link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
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SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
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SD_LLDP_SYSTEM_CAPABILITIES_ALL);
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if (r < 0)
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return r;
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r = sd_lldp_set_filter_address(link->lldp, &link->mac);
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if (r < 0)
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return r;
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r = sd_lldp_attach_event(link->lldp, NULL, 0);
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if (r < 0)
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return r;
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r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
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if (r < 0)
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return r;
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r = link_update_lldp(link);
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if (r < 0)
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return r;
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return 0;
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}
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int link_update_lldp(Link *link) {
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int r;
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assert(link);
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if (!link->lldp)
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return 0;
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if (link->flags & IFF_UP) {
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r = sd_lldp_start(link->lldp);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to start LLDP: %m");
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if (r > 0)
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log_link_debug(link, "Started LLDP.");
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} else {
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r = sd_lldp_stop(link->lldp);
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if (r < 0)
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return log_link_warning_errno(link, r, "Failed to stop LLDP: %m");
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if (r > 0)
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log_link_debug(link, "Stopped LLDP.");
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}
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return r;
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}
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int link_lldp_save(Link *link) {
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_cleanup_free_ char *temp_path = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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sd_lldp_neighbor **l = NULL;
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int n = 0, r, i;
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assert(link);
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assert(link->lldp_file);
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if (!link->lldp) {
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(void) unlink(link->lldp_file);
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return 0;
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}
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r = sd_lldp_get_neighbors(link->lldp, &l);
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if (r < 0)
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goto finish;
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if (r == 0) {
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(void) unlink(link->lldp_file);
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goto finish;
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}
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n = r;
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r = fopen_temporary(link->lldp_file, &f, &temp_path);
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if (r < 0)
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goto finish;
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fchmod(fileno(f), 0644);
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for (i = 0; i < n; i++) {
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const void *p;
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le64_t u;
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size_t sz;
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r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
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if (r < 0)
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goto finish;
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u = htole64(sz);
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(void) fwrite(&u, 1, sizeof(u), f);
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(void) fwrite(p, 1, sz, f);
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}
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r = fflush_and_check(f);
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if (r < 0)
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goto finish;
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if (rename(temp_path, link->lldp_file) < 0) {
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r = -errno;
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goto finish;
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}
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finish:
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if (r < 0) {
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(void) unlink(link->lldp_file);
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if (temp_path)
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(void) unlink(temp_path);
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log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
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}
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if (l) {
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for (i = 0; i < n; i++)
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sd_lldp_neighbor_unref(l[i]);
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free(l);
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}
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return r;
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}
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