diff options
Diffstat (limited to 'src/network/networkd-bridge-mdb.c')
| -rw-r--r-- | src/network/networkd-bridge-mdb.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/src/network/networkd-bridge-mdb.c b/src/network/networkd-bridge-mdb.c new file mode 100644 index 0000000..bd1a974 --- /dev/null +++ b/src/network/networkd-bridge-mdb.c @@ -0,0 +1,365 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <net/if.h> +#include <linux/if_bridge.h> + +#include "netlink-util.h" +#include "networkd-bridge-mdb.h" +#include "networkd-link.h" +#include "networkd-manager.h" +#include "networkd-network.h" +#include "networkd-queue.h" +#include "string-util.h" +#include "vlan-util.h" + +#define STATIC_BRIDGE_MDB_ENTRIES_PER_NETWORK_MAX 1024U + +/* remove MDB entry. */ +BridgeMDB *bridge_mdb_free(BridgeMDB *mdb) { + if (!mdb) + return NULL; + + if (mdb->network) { + assert(mdb->section); + hashmap_remove(mdb->network->bridge_mdb_entries_by_section, mdb->section); + } + + config_section_free(mdb->section); + + return mfree(mdb); +} + +DEFINE_SECTION_CLEANUP_FUNCTIONS(BridgeMDB, bridge_mdb_free); + +/* create a new MDB entry or get an existing one. */ +static int bridge_mdb_new_static( + Network *network, + const char *filename, + unsigned section_line, + BridgeMDB **ret) { + + _cleanup_(config_section_freep) ConfigSection *n = NULL; + _cleanup_(bridge_mdb_freep) BridgeMDB *mdb = 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. */ + mdb = hashmap_get(network->bridge_mdb_entries_by_section, n); + if (mdb) { + *ret = TAKE_PTR(mdb); + return 0; + } + + if (hashmap_size(network->bridge_mdb_entries_by_section) >= STATIC_BRIDGE_MDB_ENTRIES_PER_NETWORK_MAX) + return -E2BIG; + + /* allocate space for an MDB entry. */ + mdb = new(BridgeMDB, 1); + if (!mdb) + return -ENOMEM; + + /* init MDB structure. */ + *mdb = (BridgeMDB) { + .network = network, + .section = TAKE_PTR(n), + }; + + r = hashmap_ensure_put(&network->bridge_mdb_entries_by_section, &config_section_hash_ops, mdb->section, mdb); + if (r < 0) + return r; + + /* return allocated MDB structure. */ + *ret = TAKE_PTR(mdb); + return 0; +} + +static int bridge_mdb_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 == -EINVAL && streq_ptr(link->kind, "bridge") && link->master_ifindex <= 0) { + /* To configure bridge MDB entries on bridge master, 1bc844ee0faa1b92e3ede00bdd948021c78d7088 (v5.4) is required. */ + if (!link->manager->bridge_mdb_on_master_not_supported) { + log_link_warning_errno(link, r, "Kernel seems not to support bridge MDB entries on bridge master, ignoring: %m"); + link->manager->bridge_mdb_on_master_not_supported = true; + } + } else if (r < 0 && r != -EEXIST) { + log_link_message_warning_errno(link, m, r, "Could not add MDB entry"); + link_enter_failed(link); + return 1; + } + + if (link->static_bridge_mdb_messages == 0) { + link->static_bridge_mdb_configured = true; + link_check_ready(link); + } + + return 1; +} + +/* send a request to the kernel to add an MDB entry */ +static int bridge_mdb_configure(BridgeMDB *mdb, Link *link, Request *req) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; + struct br_mdb_entry entry; + int r; + + assert(mdb); + assert(link); + assert(link->manager); + assert(req); + + if (DEBUG_LOGGING) + log_link_debug(link, "Configuring bridge MDB entry: MulticastGroupAddress=%s, VLANId=%u", + IN_ADDR_TO_STRING(mdb->family, &mdb->group_addr), mdb->vlan_id); + + entry = (struct br_mdb_entry) { + /* If MDB entry is added on bridge master, then the state must be MDB_TEMPORARY. + * See br_mdb_add_group() in net/bridge/br_mdb.c of kernel. */ + .state = link->master_ifindex <= 0 ? MDB_TEMPORARY : MDB_PERMANENT, + .ifindex = link->ifindex, + .vid = mdb->vlan_id, + }; + + switch (mdb->family) { + case AF_INET: + entry.addr.u.ip4 = mdb->group_addr.in.s_addr; + entry.addr.proto = htobe16(ETH_P_IP); + break; + + case AF_INET6: + entry.addr.u.ip6 = mdb->group_addr.in6; + entry.addr.proto = htobe16(ETH_P_IPV6); + break; + + default: + assert_not_reached(); + } + + r = sd_rtnl_message_new_mdb(link->manager->rtnl, &m, RTM_NEWMDB, + link->master_ifindex > 0 ? link->master_ifindex : link->ifindex); + if (r < 0) + return r; + + r = sd_netlink_message_append_data(m, MDBA_SET_ENTRY, &entry, sizeof(entry)); + if (r < 0) + return r; + + return request_call_netlink_async(link->manager->rtnl, m, req); +} + +static bool bridge_mdb_is_ready_to_configure(Link *link) { + Link *master; + + assert(link); + + if (!link_is_ready_to_configure(link, false)) + return false; + + if (!link->master_set) + return false; + + if (link->master_ifindex <= 0 && streq_ptr(link->kind, "bridge")) + return true; /* The interface is bridge master. */ + + if (link_get_master(link, &master) < 0) + return false; + + if (!streq_ptr(master->kind, "bridge")) + return false; + + if (!IN_SET(master->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) + return false; + + if (master->set_flags_messages > 0) + return false; + + if (!link_has_carrier(master)) + return false; + + return true; +} + +static int bridge_mdb_process_request(Request *req, Link *link, void *userdata) { + BridgeMDB *mdb = ASSERT_PTR(userdata); + int r; + + assert(req); + assert(link); + + if (!bridge_mdb_is_ready_to_configure(link)) + return 0; + + r = bridge_mdb_configure(mdb, link, req); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to configure bridge MDB: %m"); + + return 1; +} + +int link_request_static_bridge_mdb(Link *link) { + BridgeMDB *mdb; + int r; + + assert(link); + assert(link->manager); + + link->static_bridge_mdb_configured = false; + + if (!link->network) + return 0; + + if (hashmap_isempty(link->network->bridge_mdb_entries_by_section)) + goto finish; + + HASHMAP_FOREACH(mdb, link->network->bridge_mdb_entries_by_section) { + r = link_queue_request_full(link, REQUEST_TYPE_BRIDGE_MDB, + mdb, NULL, + trivial_hash_func, + trivial_compare_func, + bridge_mdb_process_request, + &link->static_bridge_mdb_messages, + bridge_mdb_configure_handler, + NULL); + if (r < 0) + return log_link_error_errno(link, r, "Failed to request MDB entry to multicast group database: %m"); + } + +finish: + if (link->static_bridge_mdb_messages == 0) { + link->static_bridge_mdb_configured = true; + link_check_ready(link); + } else { + log_link_debug(link, "Setting bridge MDB entries."); + link_set_state(link, LINK_STATE_CONFIGURING); + } + + return 0; +} + +static int bridge_mdb_verify(BridgeMDB *mdb) { + if (section_is_invalid(mdb->section)) + return -EINVAL; + + if (mdb->family == AF_UNSPEC) + return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), + "%s: [BridgeMDB] section without MulticastGroupAddress= field configured. " + "Ignoring [BridgeMDB] section from line %u.", + mdb->section->filename, mdb->section->line); + + if (!in_addr_is_multicast(mdb->family, &mdb->group_addr)) + return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), + "%s: MulticastGroupAddress= is not a multicast address. " + "Ignoring [BridgeMDB] section from line %u.", + mdb->section->filename, mdb->section->line); + + if (mdb->family == AF_INET) { + if (in4_addr_is_local_multicast(&mdb->group_addr.in)) + return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), + "%s: MulticastGroupAddress= is a local multicast address. " + "Ignoring [BridgeMDB] section from line %u.", + mdb->section->filename, mdb->section->line); + } else { + if (in6_addr_is_link_local_all_nodes(&mdb->group_addr.in6)) + return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), + "%s: MulticastGroupAddress= is the multicast all nodes address. " + "Ignoring [BridgeMDB] section from line %u.", + mdb->section->filename, mdb->section->line); + } + + return 0; +} + +void network_drop_invalid_bridge_mdb_entries(Network *network) { + BridgeMDB *mdb; + + assert(network); + + HASHMAP_FOREACH(mdb, network->bridge_mdb_entries_by_section) + if (bridge_mdb_verify(mdb) < 0) + bridge_mdb_free(mdb); +} + +/* parse the VLAN Id from config files. */ +int config_parse_mdb_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_mdb_free_or_set_invalidp) BridgeMDB *mdb = NULL; + Network *network = userdata; + int r; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + r = bridge_mdb_new_static(network, filename, section_line, &mdb); + if (r < 0) + return log_oom(); + + r = config_parse_vlanid(unit, filename, line, section, + section_line, lvalue, ltype, + rvalue, &mdb->vlan_id, userdata); + if (r < 0) + return r; + + TAKE_PTR(mdb); + return 0; +} + +/* parse the multicast group from config files. */ +int config_parse_mdb_group_address( + 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_mdb_free_or_set_invalidp) BridgeMDB *mdb = NULL; + Network *network = userdata; + int r; + + assert(filename); + assert(section); + assert(lvalue); + assert(rvalue); + assert(data); + + r = bridge_mdb_new_static(network, filename, section_line, &mdb); + if (r < 0) + return log_oom(); + + r = in_addr_from_string_auto(rvalue, &mdb->family, &mdb->group_addr); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, "Cannot parse multicast group address: %m"); + return 0; + } + + TAKE_PTR(mdb); + return 0; +} |