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-rw-r--r--src/network/networkd-bridge-fdb.c535
1 files changed, 535 insertions, 0 deletions
diff --git a/src/network/networkd-bridge-fdb.c b/src/network/networkd-bridge-fdb.c
new file mode 100644
index 0000000..803e27c
--- /dev/null
+++ b/src/network/networkd-bridge-fdb.c
@@ -0,0 +1,535 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/***
+ Copyright © 2014 Intel Corporation. All rights reserved.
+***/
+
+#include <net/ethernet.h>
+#include <net/if.h>
+
+#include "alloc-util.h"
+#include "bridge.h"
+#include "netlink-util.h"
+#include "networkd-bridge-fdb.h"
+#include "networkd-link.h"
+#include "networkd-manager.h"
+#include "networkd-network.h"
+#include "networkd-queue.h"
+#include "networkd-util.h"
+#include "parse-util.h"
+#include "string-table.h"
+#include "vlan-util.h"
+#include "vxlan.h"
+
+#define STATIC_BRIDGE_FDB_ENTRIES_PER_NETWORK_MAX 1024U
+
+/* remove and FDB entry. */
+BridgeFDB *bridge_fdb_free(BridgeFDB *fdb) {
+ if (!fdb)
+ return NULL;
+
+ if (fdb->network) {
+ assert(fdb->section);
+ hashmap_remove(fdb->network->bridge_fdb_entries_by_section, fdb->section);
+ }
+
+ config_section_free(fdb->section);
+
+ free(fdb->outgoing_ifname);
+ return mfree(fdb);
+}
+
+DEFINE_SECTION_CLEANUP_FUNCTIONS(BridgeFDB, bridge_fdb_free);
+
+/* create a new FDB entry or get an existing one. */
+static int bridge_fdb_new_static(
+ Network *network,
+ const char *filename,
+ unsigned section_line,
+ BridgeFDB **ret) {
+
+ _cleanup_(config_section_freep) ConfigSection *n = NULL;
+ _cleanup_(bridge_fdb_freep) BridgeFDB *fdb = NULL;
+ int r;
+
+ assert(network);
+ assert(ret);
+ assert(filename);
+ assert(section_line > 0);
+
+ r = config_section_new(filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ /* search entry in hashmap first. */
+ fdb = hashmap_get(network->bridge_fdb_entries_by_section, n);
+ if (fdb) {
+ *ret = TAKE_PTR(fdb);
+ return 0;
+ }
+
+ if (hashmap_size(network->bridge_fdb_entries_by_section) >= STATIC_BRIDGE_FDB_ENTRIES_PER_NETWORK_MAX)
+ return -E2BIG;
+
+ /* allocate space for and FDB entry. */
+ fdb = new(BridgeFDB, 1);
+ if (!fdb)
+ return -ENOMEM;
+
+ /* init FDB structure. */
+ *fdb = (BridgeFDB) {
+ .network = network,
+ .section = TAKE_PTR(n),
+ .vni = VXLAN_VID_MAX + 1,
+ .ntf_flags = NEIGHBOR_CACHE_ENTRY_FLAGS_SELF,
+ };
+
+ r = hashmap_ensure_put(&network->bridge_fdb_entries_by_section, &config_section_hash_ops, fdb->section, fdb);
+ if (r < 0)
+ return r;
+
+ /* return allocated FDB structure. */
+ *ret = TAKE_PTR(fdb);
+
+ return 0;
+}
+
+static int bridge_fdb_configure_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
+ int r;
+
+ assert(m);
+ assert(link);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_message_warning_errno(link, m, r, "Could not add bridge FDB entry");
+ link_enter_failed(link);
+ return 0;
+ }
+
+ if (link->static_bridge_fdb_messages == 0) {
+ log_link_debug(link, "Bridge FDB entries set");
+ link->static_bridge_fdb_configured = true;
+ link_check_ready(link);
+ }
+
+ return 0;
+}
+
+/* send a request to the kernel to add a FDB entry in its static MAC table. */
+static int bridge_fdb_configure_message(const BridgeFDB *fdb, Link *link, sd_netlink_message *req) {
+ int r;
+
+ assert(fdb);
+ assert(link);
+
+ r = sd_rtnl_message_neigh_set_flags(req, fdb->ntf_flags);
+ if (r < 0)
+ return r;
+
+ /* only NUD_PERMANENT state supported. */
+ r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_append_data(req, NDA_LLADDR, &fdb->mac_addr, sizeof(fdb->mac_addr));
+ if (r < 0)
+ return r;
+
+ /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
+ if (fdb->vlan_id > 0) {
+ r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb->vlan_id);
+ if (r < 0)
+ return r;
+ }
+
+ if (fdb->outgoing_ifindex > 0) {
+ r = sd_netlink_message_append_u32(req, NDA_IFINDEX, fdb->outgoing_ifindex);
+ if (r < 0)
+ return r;
+ }
+
+ if (in_addr_is_set(fdb->family, &fdb->destination_addr)) {
+ r = netlink_message_append_in_addr_union(req, NDA_DST, fdb->family, &fdb->destination_addr);
+ if (r < 0)
+ return r;
+ }
+
+ if (fdb->vni <= VXLAN_VID_MAX) {
+ r = sd_netlink_message_append_u32(req, NDA_VNI, fdb->vni);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int bridge_fdb_configure(BridgeFDB *fdb, Link *link, Request *req) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ int r;
+
+ assert(fdb);
+ assert(link);
+ assert(link->manager);
+ assert(req);
+
+ r = sd_rtnl_message_new_neigh(link->manager->rtnl, &m, RTM_NEWNEIGH, link->ifindex, AF_BRIDGE);
+ if (r < 0)
+ return r;
+
+ r = bridge_fdb_configure_message(fdb, link, m);
+ if (r < 0)
+ return r;
+
+ return request_call_netlink_async(link->manager->rtnl, m, req);
+}
+
+static bool bridge_fdb_is_ready_to_configure(BridgeFDB *fdb, Link *link) {
+ Link *out = NULL;
+
+ assert(fdb);
+ assert(link);
+ assert(link->manager);
+
+ if (!link_is_ready_to_configure(link, false))
+ return false;
+
+ if (fdb->outgoing_ifname) {
+ if (link_get_by_name(link->manager, fdb->outgoing_ifname, &out) < 0)
+ return false;
+
+ fdb->outgoing_ifindex = out->ifindex;
+ } else if (fdb->outgoing_ifindex > 0) {
+ if (link_get_by_index(link->manager, fdb->outgoing_ifindex, &out) < 0)
+ return false;
+ }
+ if (out && !link_is_ready_to_configure(out, false))
+ return false;
+
+ return true;
+}
+
+static int bridge_fdb_process_request(Request *req, Link *link, void *userdata) {
+ BridgeFDB *fdb = ASSERT_PTR(userdata);
+ int r;
+
+ assert(req);
+ assert(link);
+
+ if (!bridge_fdb_is_ready_to_configure(fdb, link))
+ return 0;
+
+ r = bridge_fdb_configure(fdb, link, req);
+ if (r < 0)
+ return log_link_warning_errno(link, r, "Failed to configure bridge FDB: %m");
+
+ return 1;
+}
+
+int link_request_static_bridge_fdb(Link *link) {
+ BridgeFDB *fdb;
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ link->static_bridge_fdb_configured = false;
+
+ HASHMAP_FOREACH(fdb, link->network->bridge_fdb_entries_by_section) {
+ r = link_queue_request_full(link, REQUEST_TYPE_BRIDGE_FDB,
+ fdb, NULL,
+ trivial_hash_func,
+ trivial_compare_func,
+ bridge_fdb_process_request,
+ &link->static_bridge_fdb_messages,
+ bridge_fdb_configure_handler,
+ NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Failed to request static bridge FDB entry: %m");
+ }
+
+ if (link->static_bridge_fdb_messages == 0) {
+ link->static_bridge_fdb_configured = true;
+ link_check_ready(link);
+ } else {
+ log_link_debug(link, "Setting bridge FDB entries");
+ link_set_state(link, LINK_STATE_CONFIGURING);
+ }
+
+ return 0;
+}
+
+void network_drop_invalid_bridge_fdb_entries(Network *network) {
+ BridgeFDB *fdb;
+
+ assert(network);
+
+ HASHMAP_FOREACH(fdb, network->bridge_fdb_entries_by_section)
+ if (section_is_invalid(fdb->section))
+ bridge_fdb_free(fdb);
+}
+
+/* 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) {
+
+ _cleanup_(bridge_fdb_free_or_set_invalidp) BridgeFDB *fdb = NULL;
+ Network *network = userdata;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = bridge_fdb_new_static(network, filename, section_line, &fdb);
+ if (r < 0)
+ return log_oom();
+
+ r = parse_ether_addr(rvalue, &fdb->mac_addr);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r, "Not a valid MAC address, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ TAKE_PTR(fdb);
+ 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) {
+
+ _cleanup_(bridge_fdb_free_or_set_invalidp) BridgeFDB *fdb = NULL;
+ Network *network = userdata;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = bridge_fdb_new_static(network, filename, section_line, &fdb);
+ if (r < 0)
+ return log_oom();
+
+ r = config_parse_vlanid(unit, filename, line, section,
+ section_line, lvalue, ltype,
+ rvalue, &fdb->vlan_id, userdata);
+ if (r < 0)
+ return r;
+
+ TAKE_PTR(fdb);
+ return 0;
+}
+
+int config_parse_fdb_destination(
+ 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) {
+
+ _cleanup_(bridge_fdb_free_or_set_invalidp) BridgeFDB *fdb = NULL;
+ Network *network = userdata;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = bridge_fdb_new_static(network, filename, section_line, &fdb);
+ if (r < 0)
+ return log_oom();
+
+ r = in_addr_from_string_auto(rvalue, &fdb->family, &fdb->destination_addr);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "FDB destination IP address is invalid, ignoring assignment: %s",
+ rvalue);
+ return 0;
+ }
+
+ TAKE_PTR(fdb);
+ return 0;
+}
+
+int config_parse_fdb_vxlan_vni(
+ 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) {
+
+ _cleanup_(bridge_fdb_free_or_set_invalidp) BridgeFDB *fdb = NULL;
+ Network *network = userdata;
+ uint32_t vni;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = bridge_fdb_new_static(network, filename, section_line, &fdb);
+ if (r < 0)
+ return log_oom();
+
+ r = safe_atou32(rvalue, &vni);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse VXLAN Network Identifier (VNI), ignoring assignment: %s",
+ rvalue);
+ return 0;
+ }
+
+ if (vni > VXLAN_VID_MAX) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "FDB invalid VXLAN Network Identifier (VNI), ignoring assignment: %s",
+ rvalue);
+ return 0;
+ }
+
+ fdb->vni = vni;
+
+ TAKE_PTR(fdb);
+ return 0;
+}
+
+static const char* const ntf_flags_table[_NEIGHBOR_CACHE_ENTRY_FLAGS_MAX] = {
+ [NEIGHBOR_CACHE_ENTRY_FLAGS_USE] = "use",
+ [NEIGHBOR_CACHE_ENTRY_FLAGS_SELF] = "self",
+ [NEIGHBOR_CACHE_ENTRY_FLAGS_MASTER] = "master",
+ [NEIGHBOR_CACHE_ENTRY_FLAGS_ROUTER] = "router",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(ntf_flags, NeighborCacheEntryFlags);
+
+int config_parse_fdb_ntf_flags(
+ 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) {
+
+ _cleanup_(bridge_fdb_free_or_set_invalidp) BridgeFDB *fdb = NULL;
+ Network *network = userdata;
+ NeighborCacheEntryFlags f;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = bridge_fdb_new_static(network, filename, section_line, &fdb);
+ if (r < 0)
+ return log_oom();
+
+ f = ntf_flags_from_string(rvalue);
+ if (f < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, f,
+ "FDB failed to parse AssociatedWith=, ignoring assignment: %s",
+ rvalue);
+ return 0;
+ }
+
+ fdb->ntf_flags = f;
+
+ TAKE_PTR(fdb);
+ return 0;
+}
+
+int config_parse_fdb_interface(
+ 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) {
+
+ _cleanup_(bridge_fdb_free_or_set_invalidp) BridgeFDB *fdb = NULL;
+ Network *network = userdata;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = bridge_fdb_new_static(network, filename, section_line, &fdb);
+ if (r < 0)
+ return log_oom();
+
+ if (isempty(rvalue)) {
+ fdb->outgoing_ifname = mfree(fdb->outgoing_ifname);
+ fdb->outgoing_ifindex = 0;
+ TAKE_PTR(fdb);
+ return 0;
+ }
+
+ r = parse_ifindex(rvalue);
+ if (r > 0) {
+ fdb->outgoing_ifname = mfree(fdb->outgoing_ifname);
+ fdb->outgoing_ifindex = r;
+ TAKE_PTR(fdb);
+ return 0;
+ }
+
+ if (!ifname_valid_full(rvalue, IFNAME_VALID_ALTERNATIVE)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Invalid interface name in %s=, ignoring assignment: %s", lvalue, rvalue);
+ return 0;
+ }
+
+ r = free_and_strdup(&fdb->outgoing_ifname, rvalue);
+ if (r < 0)
+ return log_oom();
+ fdb->outgoing_ifindex = 0;
+
+ TAKE_PTR(fdb);
+ return 0;
+}
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