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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 "socket-util.h"
#include "string-util.h"
#include "sysctl-util.h"
static int set_ipv6_proxy_ndp_address_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_message_warning_errno(link, m, r, "Could not add IPv6 proxy ndp address entry, ignoring");
return 1;
}
/* send a request to the kernel to add a IPv6 Proxy entry to the neighbour table */
static int ipv6_proxy_ndp_address_configure(Link *link, const struct in6_addr *address) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(address);
/* create new netlink message */
r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH, link->ifindex, AF_INET6);
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, NTF_PROXY);
if (r < 0)
return log_link_error_errno(link, r, "Could not set neighbor flags: %m");
r = sd_netlink_message_append_in6_addr(req, NDA_DST, address);
if (r < 0)
return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
r = netlink_call_async(link->manager->rtnl, NULL, req, set_ipv6_proxy_ndp_address_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;
}
static bool ipv6_proxy_ndp_is_needed(Link *link) {
assert(link);
if (link->flags & IFF_LOOPBACK)
return false;
if (!link->network)
return false;
if (link->network->ipv6_proxy_ndp >= 0)
return link->network->ipv6_proxy_ndp;
return !set_isempty(link->network->ipv6_proxy_ndp_addresses);
}
static int ipv6_proxy_ndp_set(Link *link) {
bool v;
int r;
assert(link);
if (!socket_ipv6_is_supported())
return 0;
v = ipv6_proxy_ndp_is_needed(link);
r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "proxy_ndp", v);
if (r < 0)
return log_link_warning_errno(link, r, "Cannot configure proxy NDP for the interface, ignoring: %m");
return v;
}
/* configure all ipv6 proxy ndp addresses */
int link_set_ipv6_proxy_ndp_addresses(Link *link) {
struct in6_addr *address;
int r;
assert(link);
assert(link->network);
/* enable or disable proxy_ndp itself depending on whether ipv6_proxy_ndp_addresses are set or not */
r = ipv6_proxy_ndp_set(link);
if (r <= 0)
return 0;
SET_FOREACH(address, link->network->ipv6_proxy_ndp_addresses) {
r = ipv6_proxy_ndp_address_configure(link, address);
if (r < 0)
return r;
}
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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