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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <netinet/in.h>
#include <linux/if.h>
#include "netlink-util.h"
#include "networkd-ipv6-proxy-ndp.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "networkd-queue.h"
#include "socket-util.h"
#include "string-util.h"
void network_adjust_ipv6_proxy_ndp(Network *network) {
assert(network);
if (set_isempty(network->ipv6_proxy_ndp_addresses))
return;
if (!socket_ipv6_is_supported()) {
log_once(LOG_WARNING,
"%s: IPv6 proxy NDP addresses are set, but IPv6 is not supported by kernel, "
"Ignoring IPv6 proxy NDP addresses.", network->filename);
network->ipv6_proxy_ndp_addresses = set_free_free(network->ipv6_proxy_ndp_addresses);
}
}
static int ipv6_proxy_ndp_address_configure_handler(
sd_netlink *rtnl,
sd_netlink_message *m,
Request *req,
Link *link,
struct in6_addr *address) {
int r;
assert(m);
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Could not add IPv6 proxy ndp address entry, ignoring");
if (link->static_ipv6_proxy_ndp_messages == 0) {
log_link_debug(link, "IPv6 proxy NDP addresses set.");
link->static_ipv6_proxy_ndp_configured = true;
link_check_ready(link);
}
return 1;
}
/* send a request to the kernel to add an IPv6 Proxy entry to the neighbour table */
static int ipv6_proxy_ndp_address_configure(const struct in6_addr *address, Link *link, Request *req) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(address);
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(req);
/* create new netlink message */
r = sd_rtnl_message_new_neigh(link->manager->rtnl, &m, RTM_NEWNEIGH, link->ifindex, AF_INET6);
if (r < 0)
return r;
r = sd_rtnl_message_neigh_set_flags(m, NTF_PROXY);
if (r < 0)
return r;
r = sd_netlink_message_append_in6_addr(m, NDA_DST, address);
if (r < 0)
return r;
return request_call_netlink_async(link->manager->rtnl, m, req);
}
int ipv6_proxy_ndp_address_process_request(Request *req, Link *link, struct in6_addr *address) {
int r;
assert(req);
assert(link);
assert(address);
if (!link_is_ready_to_configure(link, false))
return 0;
r = ipv6_proxy_ndp_address_configure(address, link, req);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to configure IPv6 proxy NDP address: %m");
return 1;
}
int link_request_static_ipv6_proxy_ndp_addresses(Link *link) {
struct in6_addr *address;
int r;
assert(link);
assert(link->network);
link->static_ipv6_proxy_ndp_configured = false;
SET_FOREACH(address, link->network->ipv6_proxy_ndp_addresses) {
r = link_queue_request(link, REQUEST_TYPE_IPV6_PROXY_NDP, address, false,
&link->static_ipv6_proxy_ndp_messages,
(request_netlink_handler_t) ipv6_proxy_ndp_address_configure_handler,
NULL);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to request IPv6 proxy NDP address: %m");
}
if (link->static_ipv6_proxy_ndp_messages == 0) {
link->static_ipv6_proxy_ndp_configured = true;
link_check_ready(link);
} else {
log_link_debug(link, "Setting IPv6 proxy NDP addresses.");
link_set_state(link, LINK_STATE_CONFIGURING);
}
return 0;
}
int config_parse_ipv6_proxy_ndp_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) {
_cleanup_free_ struct in6_addr *address = NULL;
Network *network = userdata;
union in_addr_union buffer;
int r;
assert(filename);
assert(rvalue);
assert(network);
if (isempty(rvalue)) {
network->ipv6_proxy_ndp_addresses = set_free_free(network->ipv6_proxy_ndp_addresses);
return 0;
}
r = in_addr_from_string(AF_INET6, rvalue, &buffer);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse IPv6 proxy NDP address, ignoring: %s", rvalue);
return 0;
}
if (in_addr_is_null(AF_INET6, &buffer)) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"IPv6 proxy NDP address cannot be the ANY address, ignoring: %s", rvalue);
return 0;
}
address = newdup(struct in6_addr, &buffer.in6, 1);
if (!address)
return log_oom();
r = set_ensure_put(&network->ipv6_proxy_ndp_addresses, &in6_addr_hash_ops, address);
if (r < 0)
return log_oom();
if (r > 0)
TAKE_PTR(address);
return 0;
}
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