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-rw-r--r--src/network/networkd-fdb.c260
1 files changed, 260 insertions, 0 deletions
diff --git a/src/network/networkd-fdb.c b/src/network/networkd-fdb.c
new file mode 100644
index 0000000..324f6a5
--- /dev/null
+++ b/src/network/networkd-fdb.c
@@ -0,0 +1,260 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/***
+ Copyright © 2014 Intel Corporation. All rights reserved.
+***/
+
+#include <net/ethernet.h>
+#include <net/if.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "netdev/bridge.h"
+#include "netlink-util.h"
+#include "networkd-fdb.h"
+#include "networkd-manager.h"
+#include "util.h"
+#include "vlan-util.h"
+
+#define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
+
+/* create a new FDB entry or get an existing one. */
+int fdb_entry_new_static(
+ Network *network,
+ const char *filename,
+ unsigned section_line,
+ FdbEntry **ret) {
+
+ _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
+ _cleanup_(fdb_entry_freep) FdbEntry *fdb_entry = NULL;
+ _cleanup_free_ struct ether_addr *mac_addr = NULL;
+ int r;
+
+ assert(network);
+ assert(ret);
+ assert(!!filename == (section_line > 0));
+
+ /* search entry in hashmap first. */
+ if (filename) {
+ r = network_config_section_new(filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ fdb_entry = hashmap_get(network->fdb_entries_by_section, n);
+ if (fdb_entry) {
+ *ret = TAKE_PTR(fdb_entry);
+
+ return 0;
+ }
+ }
+
+ if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX)
+ return -E2BIG;
+
+ /* allocate space for MAC address. */
+ mac_addr = new0(struct ether_addr, 1);
+ if (!mac_addr)
+ return -ENOMEM;
+
+ /* allocate space for and FDB entry. */
+ fdb_entry = new(FdbEntry, 1);
+ if (!fdb_entry)
+ return -ENOMEM;
+
+ /* init FDB structure. */
+ *fdb_entry = (FdbEntry) {
+ .network = network,
+ .mac_addr = TAKE_PTR(mac_addr),
+ };
+
+ LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
+ network->n_static_fdb_entries++;
+
+ if (filename) {
+ fdb_entry->section = TAKE_PTR(n);
+
+ r = hashmap_ensure_allocated(&network->fdb_entries_by_section, &network_config_hash_ops);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(network->fdb_entries_by_section, fdb_entry->section, fdb_entry);
+ if (r < 0)
+ return r;
+ }
+
+ /* return allocated FDB structure. */
+ *ret = TAKE_PTR(fdb_entry);
+
+ return 0;
+}
+
+static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
+ int r;
+
+ assert(link);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST)
+ log_link_error_errno(link, r, "Could not add FDB entry: %m");
+
+ return 1;
+}
+
+/* send a request to the kernel to add a FDB entry in its static MAC table. */
+int fdb_entry_configure(Link *link, FdbEntry *fdb_entry) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+ sd_netlink *rtnl;
+ int r;
+ uint8_t flags;
+ Bridge *bridge;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+ assert(fdb_entry);
+
+ rtnl = link->manager->rtnl;
+ bridge = BRIDGE(link->network->bridge);
+
+ /* create new RTM message */
+ r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
+ if (r < 0)
+ return rtnl_log_create_error(r);
+
+ if (bridge)
+ flags = NTF_MASTER;
+ else
+ flags = NTF_SELF;
+
+ r = sd_rtnl_message_neigh_set_flags(req, flags);
+ if (r < 0)
+ return rtnl_log_create_error(r);
+
+ /* only NUD_PERMANENT state supported. */
+ r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
+ if (r < 0)
+ return rtnl_log_create_error(r);
+
+ r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
+ if (r < 0)
+ return rtnl_log_create_error(r);
+
+ /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
+ if (0 != fdb_entry->vlan_id) {
+ r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
+ if (r < 0)
+ return rtnl_log_create_error(r);
+ }
+
+ /* send message to the kernel to update its internal static MAC table. */
+ r = netlink_call_async(rtnl, NULL, req, set_fdb_handler,
+ link_netlink_destroy_callback, link);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+ link_ref(link);
+
+ return 0;
+}
+
+/* remove and FDB entry. */
+void fdb_entry_free(FdbEntry *fdb_entry) {
+ if (!fdb_entry)
+ return;
+
+ if (fdb_entry->network) {
+ LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry);
+ assert(fdb_entry->network->n_static_fdb_entries > 0);
+ fdb_entry->network->n_static_fdb_entries--;
+
+ if (fdb_entry->section)
+ hashmap_remove(fdb_entry->network->fdb_entries_by_section, fdb_entry->section);
+ }
+
+ network_config_section_free(fdb_entry->section);
+ free(fdb_entry->mac_addr);
+ free(fdb_entry);
+}
+
+/* parse the HW address from config files. */
+int config_parse_fdb_hwaddr(
+ 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) {
+
+ Network *network = userdata;
+ _cleanup_(fdb_entry_freep) FdbEntry *fdb_entry = NULL;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
+ if (r < 0)
+ return log_oom();
+
+ /* read in the MAC address for the FDB table. */
+ r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ &fdb_entry->mac_addr->ether_addr_octet[0],
+ &fdb_entry->mac_addr->ether_addr_octet[1],
+ &fdb_entry->mac_addr->ether_addr_octet[2],
+ &fdb_entry->mac_addr->ether_addr_octet[3],
+ &fdb_entry->mac_addr->ether_addr_octet[4],
+ &fdb_entry->mac_addr->ether_addr_octet[5]);
+
+ if (r != ETHER_ADDR_LEN) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ fdb_entry = NULL;
+
+ return 0;
+}
+
+/* parse the VLAN Id from config files. */
+int config_parse_fdb_vlan_id(
+ 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) {
+
+ Network *network = userdata;
+ _cleanup_(fdb_entry_freep) FdbEntry *fdb_entry = NULL;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
+ if (r < 0)
+ return log_oom();
+
+ r = config_parse_vlanid(unit, filename, line, section,
+ section_line, lvalue, ltype,
+ rvalue, &fdb_entry->vlan_id, userdata);
+ if (r < 0)
+ return r;
+
+ fdb_entry = NULL;
+
+ return 0;
+}
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