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Systemd/src/network/networkd-fdb.c
Zbigniew Jędrzejewski-Szmek 57ad760746 network: drop all checks of ipv6_disabled sysctl 
*We* control the sysctl setting. If the user configured IPv6, then we apply the
settings, and just make sure that at some point during the configuration the
sysctl is disabled (i.e. ipv6 enabled) if we have IPv6 configured.

Replaces #13283.
2019-08-27 15:31:48 +02:00

393 lines
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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 "netdev/vxlan.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"
#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_error_errno(link, r, "Could not add FDB entry: %m");
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 rtnl_log_create_error(r);
r = sd_rtnl_message_neigh_set_flags(req, fdb_entry->fdb_ntf_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_data(req, NDA_LLADDR, &fdb_entry->mac_addr, sizeof(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 (fdb_entry->vlan_id > 0) {
r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
if (r < 0)
return rtnl_log_create_error(r);
}
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;
}
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