| /*** |
| This file is part of systemd. |
| |
| Copyright (C) 2014 Intel Corporation. All rights reserved. |
| |
| 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 <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, |
| unsigned section, |
| FdbEntry **ret) { |
| |
| _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL; |
| struct ether_addr *mac_addr = NULL; |
| |
| assert(network); |
| assert(ret); |
| |
| /* search entry in hashmap first. */ |
| if (section) { |
| fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section)); |
| if (fdb_entry) { |
| *ret = fdb_entry; |
| fdb_entry = NULL; |
| |
| 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 = new0(FdbEntry, 1); |
| if (!fdb_entry) { |
| /* free previously allocated space for mac_addr. */ |
| free(mac_addr); |
| return -ENOMEM; |
| } |
| |
| /* init FDB structure. */ |
| fdb_entry->network = network; |
| fdb_entry->mac_addr = mac_addr; |
| |
| LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry); |
| network->n_static_fdb_entries++; |
| |
| if (section) { |
| fdb_entry->section = section; |
| hashmap_put(network->fdb_entries_by_section, |
| UINT_TO_PTR(fdb_entry->section), fdb_entry); |
| } |
| |
| /* return allocated FDB structure. */ |
| *ret = fdb_entry; |
| fdb_entry = NULL; |
| |
| return 0; |
| } |
| |
| static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
| Link *link = userdata; |
| 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 = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL); |
| if (r < 0) |
| return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); |
| |
| 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, UINT_TO_PTR(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_fdbentry_free_ FdbEntry *fdb_entry = NULL; |
| int r; |
| |
| assert(filename); |
| assert(section); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| r = fdb_entry_new_static(network, 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 (ETHER_ADDR_LEN != r) { |
| 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_fdbentry_free_ FdbEntry *fdb_entry = NULL; |
| int r; |
| |
| assert(filename); |
| assert(section); |
| assert(lvalue); |
| assert(rvalue); |
| assert(data); |
| |
| r = fdb_entry_new_static(network, 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; |
| } |