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/* SPDX-License-Identifier: LGPL-2.1+ */
#include "sd-netlink.h"
#include "alloc-util.h"
#include "conf-parser.h"
#include "ether-addr-util.h"
#include "hashmap.h"
#include "in-addr-util.h"
#include "netlink-util.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-neighbor.h"
void neighbor_free(Neighbor *neighbor) {
if (!neighbor)
return;
if (neighbor->network) {
LIST_REMOVE(neighbors, neighbor->network->neighbors, neighbor);
assert(neighbor->network->n_neighbors > 0);
neighbor->network->n_neighbors--;
if (neighbor->section) {
hashmap_remove(neighbor->network->neighbors_by_section, neighbor->section);
network_config_section_free(neighbor->section);
}
}
free(neighbor);
}
static int neighbor_new_static(Network *network, const char *filename, unsigned section_line, Neighbor **ret) {
_cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
_cleanup_(neighbor_freep) Neighbor *neighbor = NULL;
int r;
assert(network);
assert(ret);
assert(!!filename == (section_line > 0));
if (filename) {
r = network_config_section_new(filename, section_line, &n);
if (r < 0)
return r;
neighbor = hashmap_get(network->neighbors_by_section, n);
if (neighbor) {
*ret = TAKE_PTR(neighbor);
return 0;
}
}
neighbor = new(Neighbor, 1);
if (!neighbor)
return -ENOMEM;
*neighbor = (Neighbor) {
.network = network,
.family = AF_UNSPEC,
};
LIST_APPEND(neighbors, network->neighbors, neighbor);
network->n_neighbors++;
if (filename) {
neighbor->section = TAKE_PTR(n);
r = hashmap_ensure_allocated(&network->neighbors_by_section, &network_config_hash_ops);
if (r < 0)
return r;
r = hashmap_put(network->neighbors_by_section, neighbor->section, neighbor);
if (r < 0)
return r;
}
*ret = TAKE_PTR(neighbor);
return 0;
}
static int neighbor_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
assert(link->neighbor_messages > 0);
link->neighbor_messages--;
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_warning_errno(link, r, "Could not set neighbor: %m");
if (link->neighbor_messages == 0) {
log_link_debug(link, "Neighbors set");
link->neighbors_configured = true;
link_check_ready(link);
}
return 1;
}
int neighbor_configure(Neighbor *neighbor, Link *link, link_netlink_message_handler_t callback) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(neighbor);
assert(link);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
if (neighbor->family == AF_UNSPEC)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without Address= configured");
if (!neighbor->mac_configured)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor without MACAddress= configured");
r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH,
link->ifindex, neighbor->family);
if (r < 0)
return log_error_errno(r, "Could not allocate RTM_NEWNEIGH message: %m");
r = sd_rtnl_message_neigh_set_state(req, NUD_PERMANENT);
if (r < 0)
return log_error_errno(r, "Could not set state: %m");
r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE);
if (r < 0)
return log_error_errno(r, "Could not set flags: %m");
r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, &neighbor->mac);
if (r < 0)
return log_error_errno(r, "Could not append NDA_LLADDR attribute: %m");
switch (neighbor->family) {
case AF_INET6:
r = sd_netlink_message_append_in6_addr(req, NDA_DST, &neighbor->in_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append NDA_DST attribute: %m");
break;
case AF_INET:
r = sd_netlink_message_append_in_addr(req, NDA_DST, &neighbor->in_addr.in);
if (r < 0)
return log_error_errno(r, "Could not append NDA_DST attribute: %m");
break;
default:
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Neighbor with invalid address family");
}
r = netlink_call_async(link->manager->rtnl, NULL, req, callback ?: neighbor_handler,
link_netlink_destroy_callback, link);
if (r < 0)
return log_error_errno(r, "Could not send rtnetlink message: %m");
link->neighbor_messages++;
link_ref(link);
return 0;
}
int config_parse_neighbor_address(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_(neighbor_freep) Neighbor *n = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = neighbor_new_static(network, filename, section_line, &n);
if (r < 0)
return r;
r = in_addr_from_string_auto(rvalue, &n->family, &n->in_addr);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor Address is invalid, ignoring assignment: %s", rvalue);
return 0;
}
TAKE_PTR(n);
return 0;
}
int config_parse_neighbor_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_(neighbor_freep) Neighbor *n = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = neighbor_new_static(network, filename, section_line, &n);
if (r < 0)
return r;
r = ether_addr_from_string(rvalue, &n->mac);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Neighbor MACAddress is invalid, ignoring assignment: %s", rvalue);
return 0;
}
n->mac_configured = true;
TAKE_PTR(n);
return 0;
}
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