| /* 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 "bridge.h" |
| #include "conf-parser.h" |
| #include "netlink-util.h" |
| #include "networkd-fdb.h" |
| #include "networkd-manager.h" |
| #include "parse-util.h" |
| #include "string-util.h" |
| #include "string-table.h" |
| #include "util.h" |
| #include "vlan-util.h" |
| #include "vxlan.h" |
| |
| #define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U |
| |
| static const char* const fdb_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_STRING_TABLE_LOOKUP(fdb_ntf_flags, NeighborCacheEntryFlags); |
| |
| /* create a new FDB entry or get an existing one. */ |
| static 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; |
| 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 and FDB entry. */ |
| fdb_entry = new(FdbEntry, 1); |
| if (!fdb_entry) |
| return -ENOMEM; |
| |
| /* init FDB structure. */ |
| *fdb_entry = (FdbEntry) { |
| .network = network, |
| .vni = VXLAN_VID_MAX + 1, |
| .fdb_ntf_flags = NEIGHBOR_CACHE_ENTRY_FLAGS_SELF, |
| }; |
| |
| 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); |
| |
| if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) |
| return 1; |
| |
| r = sd_netlink_message_get_errno(m); |
| if (r < 0 && r != -EEXIST) { |
| log_link_message_warning_errno(link, m, r, "Could not add FDB entry"); |
| link_enter_failed(link); |
| return 1; |
| } |
| |
| 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; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->manager); |
| assert(fdb_entry); |
| |
| /* create new RTM message */ |
| r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not create RTM_NEWNEIGH message: %m"); |
| |
| r = sd_rtnl_message_neigh_set_flags(req, fdb_entry->fdb_ntf_flags); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not set neighbor flags: %m"); |
| |
| /* only NUD_PERMANENT state supported. */ |
| r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not set neighbor state: %m"); |
| |
| r = sd_netlink_message_append_data(req, NDA_LLADDR, &fdb_entry->mac_addr, sizeof(fdb_entry->mac_addr)); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not append NDA_LLADDR attribute: %m"); |
| |
| /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */ |
| if (fdb_entry->vlan_id > 0) { |
| r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not append NDA_VLAN attribute: %m"); |
| } |
| |
| if (!in_addr_is_null(fdb_entry->family, &fdb_entry->destination_addr)) { |
| r = netlink_message_append_in_addr_union(req, NDA_DST, fdb_entry->family, &fdb_entry->destination_addr); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m"); |
| } |
| |
| if (fdb_entry->vni <= VXLAN_VID_MAX) { |
| r = sd_netlink_message_append_u32(req, NDA_VNI, fdb_entry->vni); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not append NDA_VNI attribute: %m"); |
| } |
| |
| /* send message to the kernel to update its internal static MAC table. */ |
| r = netlink_call_async(link->manager->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 1; |
| } |
| |
| /* 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); |
| } |
| |
| /* 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_free_or_set_invalidp) 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 = ether_addr_from_string(rvalue, &fdb_entry->mac_addr); |
| if (r < 0) { |
| log_syntax(unit, LOG_ERR, filename, line, r, "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_free_or_set_invalidp) 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; |
| } |
| |
| 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_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL; |
| Network *network = userdata; |
| 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 = in_addr_from_string_auto(rvalue, &fdb_entry->family, &fdb_entry->destination_addr); |
| if (r < 0) |
| return log_syntax(unit, LOG_ERR, filename, line, r, |
| "FDB destination IP address is invalid, ignoring assignment: %s", |
| rvalue); |
| |
| fdb_entry = NULL; |
| |
| 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_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL; |
| Network *network = userdata; |
| uint32_t vni; |
| 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 = safe_atou32(rvalue, &vni); |
| if (r < 0) { |
| log_syntax(unit, LOG_ERR, 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_ERR, filename, line, 0, |
| "FDB invalid VXLAN Network Identifier (VNI), ignoring assignment: %s", |
| rvalue); |
| return 0; |
| } |
| |
| fdb_entry->vni = vni; |
| fdb_entry = NULL; |
| |
| return 0; |
| } |
| |
| 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_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL; |
| Network *network = userdata; |
| NeighborCacheEntryFlags f; |
| 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(); |
| |
| f = fdb_ntf_flags_from_string(rvalue); |
| if (f < 0) { |
| log_syntax(unit, LOG_ERR, filename, line, 0, |
| "FDB failed to parse AssociatedWith=, ignoring assignment: %s", |
| rvalue); |
| return 0; |
| } |
| |
| fdb_entry->fdb_ntf_flags = f; |
| fdb_entry = NULL; |
| |
| return 0; |
| } |