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/* 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 "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. */
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;
_cleanup_free_ struct ether_addr *mac_addr = 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 MAC address. */
mac_addr = new0(struct ether_addr, 1);
if (!mac_addr)
return -ENOMEM;
/* allocate space for and FDB entry. */
fdb_entry = new(FdbEntry, 1);
if (!fdb_entry)
return -ENOMEM;
/* init FDB structure. */
*fdb_entry = (FdbEntry) {
.network = network,
.mac_addr = TAKE_PTR(mac_addr),
};
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);
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 = netlink_call_async(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 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, fdb_entry->section);
}
network_config_section_free(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_(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();
/* 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 (r != ETHER_ADDR_LEN) {
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_(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;
}
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