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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2014 Intel Corporation. All rights reserved.
***/
#include <net/ethernet.h>
#include <net/if.h>
#include "alloc-util.h"
#include "bridge.h"
#include "netlink-util.h"
#include "networkd-fdb.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "parse-util.h"
#include "string-table.h"
#include "vlan-util.h"
#include "vxlan.h"
#define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
/* remove and FDB entry. */
FdbEntry *fdb_entry_free(FdbEntry *fdb_entry) {
if (!fdb_entry)
return NULL;
if (fdb_entry->network) {
assert(fdb_entry->section);
hashmap_remove(fdb_entry->network->fdb_entries_by_section, fdb_entry->section);
}
network_config_section_free(fdb_entry->section);
return mfree(fdb_entry);
}
DEFINE_NETWORK_SECTION_FUNCTIONS(FdbEntry, fdb_entry_free);
/* 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);
assert(section_line > 0);
r = network_config_section_new(filename, section_line, &n);
if (r < 0)
return r;
/* search entry in hashmap first. */
fdb_entry = hashmap_get(network->fdb_entries_by_section, n);
if (fdb_entry) {
*ret = TAKE_PTR(fdb_entry);
return 0;
}
if (hashmap_size(network->fdb_entries_by_section) >= 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,
.section = TAKE_PTR(n),
.vni = VXLAN_VID_MAX + 1,
.fdb_ntf_flags = NEIGHBOR_CACHE_ENTRY_FLAGS_SELF,
};
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. */
static 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, AF_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;
}
int link_set_bridge_fdb(Link *link) {
FdbEntry *fdb_entry;
int r;
assert(link);
assert(link->network);
HASHMAP_FOREACH(fdb_entry, link->network->fdb_entries_by_section) {
r = fdb_entry_configure(link, fdb_entry);
if (r < 0)
return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
}
return 0;
}
void network_drop_invalid_fdb_entries(Network *network) {
FdbEntry *fdb_entry;
assert(network);
HASHMAP_FOREACH(fdb_entry, network->fdb_entries_by_section)
if (section_is_invalid(fdb_entry->section))
fdb_entry_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_WARNING, 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) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"FDB destination IP address is invalid, ignoring assignment: %s",
rvalue);
return 0;
}
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_WARNING, 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_WARNING, filename, line, 0,
"FDB invalid VXLAN Network Identifier (VNI), ignoring assignment: %s",
rvalue);
return 0;
}
fdb_entry->vni = vni;
fdb_entry = NULL;
return 0;
}
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_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(fdb_ntf_flags, NeighborCacheEntryFlags);
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_WARNING, filename, line, SYNTHETIC_ERRNO(EINVAL),
"FDB failed to parse AssociatedWith=, ignoring assignment: %s",
rvalue);
return 0;
}
fdb_entry->fdb_ntf_flags = f;
fdb_entry = NULL;
return 0;
}