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-rw-r--r--src/basic/hostname-util.c28
-rw-r--r--src/basic/hostname-util.h1
-rw-r--r--src/network/networkd-link.c29
-rw-r--r--src/network/networkd-link.h5
-rw-r--r--src/network/networkd-lldp-tx.c347
-rw-r--r--src/network/networkd-lldp-tx.h25
-rw-r--r--src/network/networkd-network-gperf.gperf1
-rw-r--r--src/network/networkd-network.h3
8 files changed, 436 insertions, 3 deletions
diff --git a/src/basic/hostname-util.c b/src/basic/hostname-util.c
index 57031b645c..f900c509a3 100644
--- a/src/basic/hostname-util.c
+++ b/src/basic/hostname-util.c
@@ -48,6 +48,9 @@ bool hostname_is_set(void) {
char* gethostname_malloc(void) {
struct utsname u;
+ /* This call tries to return something useful, either the actual hostname or it makes something up. The only
+ * reason it might mail is OOM. It might even return "localhost" if that's set. */
+
assert_se(uname(&u) >= 0);
if (isempty(u.nodename) || streq(u.nodename, "(none)"))
@@ -56,6 +59,31 @@ char* gethostname_malloc(void) {
return strdup(u.nodename);
}
+int gethostname_strict(char **ret) {
+ struct utsname u;
+ char *k;
+
+ /* This call will rather fail than make up a name. It will not return "localhost" either. */
+
+ assert_se(uname(&u) >= 0);
+
+ if (isempty(u.nodename))
+ return -ENXIO;
+
+ if (streq(u.nodename, "(none)"))
+ return -ENXIO;
+
+ if (is_localhost(u.nodename))
+ return -ENXIO;
+
+ k = strdup(u.nodename);
+ if (!k)
+ return -ENOMEM;
+
+ *ret = k;
+ return 0;
+}
+
static bool hostname_valid_char(char c) {
return
(c >= 'a' && c <= 'z') ||
diff --git a/src/basic/hostname-util.h b/src/basic/hostname-util.h
index d062eddea1..7af4e6c7ec 100644
--- a/src/basic/hostname-util.h
+++ b/src/basic/hostname-util.h
@@ -26,6 +26,7 @@
bool hostname_is_set(void);
char* gethostname_malloc(void);
+int gethostname_strict(char **ret);
bool hostname_is_valid(const char *s, bool allow_trailing_dot) _pure_;
char* hostname_cleanup(char *s);
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 2bc6e3c842..86fa4f07f2 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -30,6 +30,7 @@
#include "netlink-util.h"
#include "network-internal.h"
#include "networkd-link.h"
+#include "networkd-lldp-tx.h"
#include "networkd-netdev.h"
#include "set.h"
#include "socket-util.h"
@@ -99,7 +100,7 @@ static bool link_ipv6ll_enabled(Link *link) {
return link->network->link_local & ADDRESS_FAMILY_IPV6;
}
-static bool link_lldp_enabled(Link *link) {
+static bool link_lldp_rx_enabled(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
@@ -117,6 +118,21 @@ static bool link_lldp_enabled(Link *link) {
return link->network->lldp_mode != LLDP_MODE_NO;
}
+static bool link_lldp_tx_enabled(Link *link) {
+ assert(link);
+
+ if (link->flags & IFF_LOOPBACK)
+ return false;
+
+ if (link->iftype != ARPHRD_ETHER)
+ return false;
+
+ if (!link->network)
+ return false;
+
+ return link->network->lldp_emit;
+}
+
static bool link_ipv4_forward_enabled(Link *link) {
assert(link);
@@ -419,6 +435,8 @@ static void link_free(Link *link) {
sd_dhcp_client_unref(link->dhcp_client);
sd_dhcp_lease_unref(link->dhcp_lease);
+ link_lldp_tx_stop(link);
+
free(link->lease_file);
sd_lldp_unref(link->lldp);
@@ -546,6 +564,7 @@ static int link_stop_clients(Link *link) {
r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
}
+ link_lldp_tx_stop(link);
return r;
}
@@ -1383,6 +1402,12 @@ static int link_acquire_conf(Link *link) {
return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
}
+ if (link_lldp_tx_enabled(link)) {
+ r = link_lldp_tx_start(link);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
+ }
+
return 0;
}
@@ -2191,7 +2216,7 @@ static int link_configure(Link *link) {
return r;
}
- if (link_lldp_enabled(link)) {
+ if (link_lldp_rx_enabled(link)) {
r = sd_lldp_new(&link->lldp, link->ifindex);
if (r < 0)
return r;
diff --git a/src/network/networkd-link.h b/src/network/networkd-link.h
index d9f637cb6e..f2a64ca9b5 100644
--- a/src/network/networkd-link.h
+++ b/src/network/networkd-link.h
@@ -112,9 +112,14 @@ struct Link {
sd_dhcp6_client *dhcp6_client;
bool rtnl_extended_attrs;
+ /* This is about LLDP reception */
sd_lldp *lldp;
char *lldp_file;
+ /* This is about LLDP transmission */
+ unsigned lldp_tx_fast; /* The LLDP txFast counter (See 802.1ab-2009, section 9.2.5.18) */
+ sd_event_source *lldp_tx_event_source;
+
Hashmap *bound_by_links;
Hashmap *bound_to_links;
};
diff --git a/src/network/networkd-lldp-tx.c b/src/network/networkd-lldp-tx.c
new file mode 100644
index 0000000000..ae8367a60e
--- /dev/null
+++ b/src/network/networkd-lldp-tx.c
@@ -0,0 +1,347 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2016 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <endian.h>
+#include <inttypes.h>
+#include <string.h>
+
+#include "fd-util.h"
+#include "fileio.h"
+#include "hostname-util.h"
+#include "lldp.h"
+#include "networkd-lldp-tx.h"
+#include "random-util.h"
+#include "socket-util.h"
+#include "string-util.h"
+#include "unaligned.h"
+
+/* The LLDP spec calls this "txFastInit", see 9.2.5.19 */
+#define LLDP_TX_FAST_INIT 4U
+
+/* The LLDP spec calls this "msgTxHold", see 9.2.5.6 */
+#define LLDP_TX_HOLD 4U
+
+/* The jitter range to add, see 9.2.2. */
+#define LLDP_JITTER_USEC (400U * USEC_PER_MSEC)
+
+/* The LLDP spec calls this msgTxInterval, but we subtract half the jitter off it. */
+#define LLDP_TX_INTERVAL_USEC (30U * USEC_PER_SEC - LLDP_JITTER_USEC / 2)
+
+/* The LLDP spec calls this msgFastTx, but we subtract half the jitter off it. */
+#define LLDP_FAST_TX_USEC (1U * USEC_PER_SEC - LLDP_JITTER_USEC / 2)
+
+static int lldp_write_tlv_header(uint8_t **p, uint8_t id, size_t sz) {
+ assert(p);
+
+ if (id > 127)
+ return -EBADMSG;
+ if (sz > 511)
+ return -ENOBUFS;
+
+ (*p)[0] = (id << 1) | !!(sz & 256);
+ (*p)[1] = sz & 255;
+
+ *p = *p + 2;
+ return 0;
+}
+
+static int lldp_make_packet(
+ const struct ether_addr *hwaddr,
+ const char *machine_id,
+ const char *ifname,
+ uint16_t ttl,
+ const char *port_description,
+ const char *hostname,
+ const char *pretty_hostname,
+ uint16_t system_capabilities,
+ uint16_t enabled_capabilities,
+ void **ret, size_t *sz) {
+
+ size_t machine_id_length, ifname_length, port_description_length = 0, hostname_length = 0, pretty_hostname_length = 0;
+ _cleanup_free_ void *packet = NULL;
+ struct ether_header *h;
+ uint8_t *p;
+ size_t l;
+ int r;
+
+ assert(hwaddr);
+ assert(machine_id);
+ assert(ifname);
+ assert(ret);
+ assert(sz);
+
+ machine_id_length = strlen(machine_id);
+ ifname_length = strlen(ifname);
+
+ if (port_description)
+ port_description_length = strlen(port_description);
+
+ if (hostname)
+ hostname_length = strlen(hostname);
+
+ if (pretty_hostname)
+ pretty_hostname_length = strlen(pretty_hostname);
+
+ l = sizeof(struct ether_header) +
+ /* Chassis ID */
+ 2 + 1 + machine_id_length +
+ /* Port ID */
+ 2 + 1 + ifname_length +
+ /* TTL */
+ 2 + 2 +
+ /* System Capabilities */
+ 2 + 4 +
+ /* End */
+ 2;
+
+ /* Port Description */
+ if (port_description)
+ l += 2 + port_description_length;
+
+ /* System Name */
+ if (hostname)
+ l += 2 + hostname_length;
+
+ /* System Description */
+ if (pretty_hostname)
+ l += 2 + pretty_hostname_length;
+
+ packet = malloc(l);
+ if (!packet)
+ return -ENOMEM;
+
+ h = (struct ether_header*) packet;
+ h->ether_type = htobe16(ETHERTYPE_LLDP);
+ memcpy(h->ether_dhost, &(struct ether_addr) { LLDP_MULTICAST_ADDR }, ETH_ALEN);
+ memcpy(h->ether_shost, hwaddr, ETH_ALEN);
+
+ p = (uint8_t*) packet + sizeof(struct ether_header);
+
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_CHASSIS_ID, 1 + machine_id_length);
+ if (r < 0)
+ return r;
+ *(p++) = LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED;
+ p = mempcpy(p, machine_id, machine_id_length);
+
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_PORT_ID, 1 + ifname_length);
+ if (r < 0)
+ return r;
+ *(p++) = LLDP_PORT_SUBTYPE_INTERFACE_NAME;
+ p = mempcpy(p, ifname, ifname_length);
+
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_TTL, 2);
+ if (r < 0)
+ return r;
+ unaligned_write_be16(p, ttl);
+ p += 2;
+
+ if (port_description) {
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_PORT_DESCRIPTION, port_description_length);
+ if (r < 0)
+ return r;
+ p = mempcpy(p, port_description, port_description_length);
+ }
+
+ if (hostname) {
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_SYSTEM_NAME, hostname_length);
+ if (r < 0)
+ return r;
+ p = mempcpy(p, hostname, hostname_length);
+ }
+
+ if (pretty_hostname) {
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_SYSTEM_DESCRIPTION, pretty_hostname_length);
+ if (r < 0)
+ return r;
+ p = mempcpy(p, pretty_hostname, pretty_hostname_length);
+ }
+
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_SYSTEM_CAPABILITIES, 4);
+ if (r < 0)
+ return r;
+ unaligned_write_be16(p, system_capabilities);
+ p += 2;
+ unaligned_write_be16(p, enabled_capabilities);
+ p += 2;
+
+ r = lldp_write_tlv_header(&p, LLDP_TYPE_END, 0);
+ if (r < 0)
+ return r;
+
+ assert(p == (uint8_t*) packet + l);
+
+ *ret = packet;
+ *sz = l;
+
+ packet = NULL;
+ return 0;
+}
+
+static int lldp_send_packet(int ifindex, const void *packet, size_t packet_size) {
+
+ union sockaddr_union sa = {
+ .ll.sll_family = AF_PACKET,
+ .ll.sll_protocol = htobe16(ETHERTYPE_LLDP),
+ .ll.sll_ifindex = ifindex,
+ .ll.sll_halen = ETH_ALEN,
+ .ll.sll_addr = LLDP_MULTICAST_ADDR,
+ };
+
+ _cleanup_close_ int fd = -1;
+ ssize_t l;
+
+ assert(ifindex > 0);
+ assert(packet || packet_size <= 0);
+
+ fd = socket(PF_PACKET, SOCK_RAW|SOCK_CLOEXEC, IPPROTO_RAW);
+ if (fd < 0)
+ return -errno;
+
+ l = sendto(fd, packet, packet_size, MSG_NOSIGNAL, &sa.sa, sizeof(sa.ll));
+ if (l < 0)
+ return -errno;
+
+ if ((size_t) l != packet_size)
+ return -EIO;
+
+ return 0;
+}
+
+static int link_send_lldp(Link *link) {
+ char machine_id_string[SD_ID128_STRING_MAX];
+ _cleanup_free_ char *hostname = NULL, *pretty_hostname = NULL;
+ _cleanup_free_ void *packet = NULL;
+ size_t packet_size = 0;
+ sd_id128_t machine_id;
+ uint16_t caps;
+ usec_t ttl;
+ int r;
+
+ r = sd_id128_get_machine(&machine_id);
+ if (r < 0)
+ return r;
+
+ (void) gethostname_strict(&hostname);
+ (void) parse_env_file("/etc/machine-info", NEWLINE, "PRETTY_HOSTNAME", &pretty_hostname, NULL);
+
+ ttl = DIV_ROUND_UP(LLDP_TX_INTERVAL_USEC * LLDP_TX_HOLD + 1, USEC_PER_SEC);
+ if (ttl > (usec_t) UINT16_MAX)
+ ttl = (usec_t) UINT16_MAX;
+
+ caps = (link->network && link->network->ip_forward != ADDRESS_FAMILY_NO) ?
+ LLDP_SYSTEM_CAPABILITIES_ROUTER :
+ LLDP_SYSTEM_CAPABILITIES_STATION;
+
+ r = lldp_make_packet(&link->mac,
+ sd_id128_to_string(machine_id, machine_id_string),
+ link->ifname,
+ (uint16_t) ttl,
+ link->network ? link->network->description : NULL,
+ hostname,
+ pretty_hostname,
+ LLDP_SYSTEM_CAPABILITIES_STATION|LLDP_SYSTEM_CAPABILITIES_BRIDGE|LLDP_SYSTEM_CAPABILITIES_ROUTER,
+ caps,
+ &packet, &packet_size);
+ if (r < 0)
+ return r;
+
+ return lldp_send_packet(link->ifindex, packet, packet_size);
+}
+
+static int on_lldp_timer(sd_event_source *s, usec_t t, void *userdata) {
+ Link *link = userdata;
+ usec_t current, delay, next;
+ int r;
+
+ assert(s);
+ assert(userdata);
+
+ log_link_debug(link, "Sending LLDP packet...");
+
+ r = link_send_lldp(link);
+ if (r < 0)
+ log_link_debug_errno(link, r, "Failed to send LLDP packet, ignoring: %m");
+
+ if (link->lldp_tx_fast > 0)
+ link->lldp_tx_fast--;
+
+ assert_se(sd_event_now(sd_event_source_get_event(s), clock_boottime_or_monotonic(), &current) >= 0);
+
+ delay = link->lldp_tx_fast > 0 ? LLDP_FAST_TX_USEC : LLDP_TX_INTERVAL_USEC;
+ next = usec_add(usec_add(current, delay), (usec_t) random_u64() % LLDP_JITTER_USEC);
+
+ r = sd_event_source_set_time(s, next);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Failed to restart LLDP timer: %m");
+
+ r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Failed to enable LLDP timer: %m");
+
+ return 0;
+}
+
+int link_lldp_tx_start(Link *link) {
+ usec_t next;
+ int r;
+
+ assert(link);
+
+ /* Starts the LLDP transmission in "fast" mode. If it is already started, turns "fast" mode back on again. */
+
+ link->lldp_tx_fast = LLDP_TX_FAST_INIT;
+
+ next = usec_add(usec_add(now(clock_boottime_or_monotonic()), LLDP_FAST_TX_USEC),
+ (usec_t) random_u64() % LLDP_JITTER_USEC);
+
+ if (link->lldp_tx_event_source) {
+ usec_t old;
+
+ /* Lower the timeout, maybe */
+ r = sd_event_source_get_time(link->lldp_tx_event_source, &old);
+ if (r < 0)
+ return r;
+
+ if (old <= next)
+ return 0;
+
+ return sd_event_source_set_time(link->lldp_tx_event_source, next);
+ } else {
+ r = sd_event_add_time(
+ link->manager->event,
+ &link->lldp_tx_event_source,
+ clock_boottime_or_monotonic(),
+ next,
+ 0,
+ on_lldp_timer,
+ link);
+ if (r < 0)
+ return r;
+
+ (void) sd_event_source_set_description(link->lldp_tx_event_source, "lldp-tx");
+ }
+
+ return 0;
+}
+
+void link_lldp_tx_stop(Link *link) {
+ assert(link);
+
+ link->lldp_tx_event_source = sd_event_source_unref(link->lldp_tx_event_source);
+}
diff --git a/src/network/networkd-lldp-tx.h b/src/network/networkd-lldp-tx.h
new file mode 100644
index 0000000000..8c7f403005
--- /dev/null
+++ b/src/network/networkd-lldp-tx.h
@@ -0,0 +1,25 @@
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2016 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "networkd-link.h"
+
+int link_lldp_tx_start(Link *link);
+void link_lldp_tx_stop(Link *link);
diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf
index d67da5d7b6..a5d1714293 100644
--- a/src/network/networkd-network-gperf.gperf
+++ b/src/network/networkd-network-gperf.gperf
@@ -41,6 +41,7 @@ Network.LinkLocalAddressing, config_parse_address_family_boolean,
Network.IPv4LLRoute, config_parse_bool, 0, offsetof(Network, ipv4ll_route)
Network.IPv6Token, config_parse_ipv6token, 0, offsetof(Network, ipv6_token)
Network.LLDP, config_parse_lldp_mode, 0, offsetof(Network, lldp_mode)
+Network.EmitLLDP, config_parse_bool, 0, offsetof(Network, lldp_emit)
Network.Address, config_parse_address, 0, 0
Network.Gateway, config_parse_gateway, 0, 0
Network.Domains, config_parse_domains, 0, 0
diff --git a/src/network/networkd-network.h b/src/network/networkd-network.h
index 9dcebfbf7b..4a13e2b574 100644
--- a/src/network/networkd-network.h
+++ b/src/network/networkd-network.h
@@ -145,7 +145,8 @@ struct Network {
struct ether_addr *mac;
unsigned mtu;
- LLDPMode lldp_mode;
+ LLDPMode lldp_mode; /* LLDP reception */
+ bool lldp_emit; /* LLDP transmission */
LIST_HEAD(Address, static_addresses);
LIST_HEAD(Route, static_routes);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-14 03:29:34 +0000