diff options
Diffstat (limited to 'src/network/networkd-fdb.c')
| -rw-r--r-- | src/network/networkd-fdb.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/network/networkd-fdb.c b/src/network/networkd-fdb.c new file mode 100644 index 0000000000..1538caa204 --- /dev/null +++ b/src/network/networkd-fdb.c @@ -0,0 +1,243 @@ +/*** + 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 "netlink-util.h" +#include "networkd-fdb.h" +#include "networkd.h" +#include "util.h" + +/* create a new FDB entry or get an existing one. */ +int fdb_entry_new_static(Network *const network, + const unsigned section, + FdbEntry **ret) { + _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL; + struct ether_addr *mac_addr = NULL; + + assert(network); + + /* 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; + } + } + + /* 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); + + 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 *const link, FdbEntry *const fdb_entry) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + sd_netlink *rtnl; + int r; + + assert(link); + assert(link->manager); + assert(fdb_entry); + + rtnl = link->manager->rtnl; + + /* 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); + + /* only NTF_SELF flag supported. */ + r = sd_rtnl_message_neigh_set_flags(req, NTF_SELF); + 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); + + 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_unsigned(unit, filename, line, section, + section_line, lvalue, ltype, + rvalue, &fdb_entry->vlan_id, userdata); + if (r < 0) + return r; + + fdb_entry = NULL; + + return 0; +} |