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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <netinet/in.h>
#include <linux/if.h>
#include <unistd.h>
#include "fileio.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 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;
if (link->network->n_ipv6_proxy_ndp_addresses == 0)
return false;
return true;
}
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)
log_link_warning_errno(link, r, "Cannot configure proxy NDP for interface: %m");
return 0;
}
static int ipv6_proxy_ndp_address_new_static(Network *network, IPv6ProxyNDPAddress **ret) {
_cleanup_(ipv6_proxy_ndp_address_freep) IPv6ProxyNDPAddress *ipv6_proxy_ndp_address = NULL;
assert(network);
assert(ret);
/* allocate space for IPv6ProxyNDPAddress entry */
ipv6_proxy_ndp_address = new(IPv6ProxyNDPAddress, 1);
if (!ipv6_proxy_ndp_address)
return -ENOMEM;
*ipv6_proxy_ndp_address = (IPv6ProxyNDPAddress) {
.network = network,
};
LIST_PREPEND(ipv6_proxy_ndp_addresses, network->ipv6_proxy_ndp_addresses, ipv6_proxy_ndp_address);
network->n_ipv6_proxy_ndp_addresses++;
*ret = TAKE_PTR(ipv6_proxy_ndp_address);
return 0;
}
void ipv6_proxy_ndp_address_free(IPv6ProxyNDPAddress *ipv6_proxy_ndp_address) {
if (!ipv6_proxy_ndp_address)
return;
if (ipv6_proxy_ndp_address->network) {
LIST_REMOVE(ipv6_proxy_ndp_addresses, ipv6_proxy_ndp_address->network->ipv6_proxy_ndp_addresses,
ipv6_proxy_ndp_address);
assert(ipv6_proxy_ndp_address->network->n_ipv6_proxy_ndp_addresses > 0);
ipv6_proxy_ndp_address->network->n_ipv6_proxy_ndp_addresses--;
}
free(ipv6_proxy_ndp_address);
}
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) {
Network *network = userdata;
_cleanup_(ipv6_proxy_ndp_address_freep) IPv6ProxyNDPAddress *ipv6_proxy_ndp_address = NULL;
int r;
union in_addr_union buffer;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = ipv6_proxy_ndp_address_new_static(network, &ipv6_proxy_ndp_address);
if (r < 0)
return r;
r = in_addr_from_string(AF_INET6, rvalue, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, 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_ERR, filename, line, 0,
"IPv6 proxy NDP address cannot be the ANY address, ignoring: %s", rvalue);
return 0;
}
ipv6_proxy_ndp_address->in_addr = buffer.in6;
ipv6_proxy_ndp_address = NULL;
return 0;
}
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_error_errno(link, r, "Could not add IPv6 proxy ndp address entry: %m");
return 1;
}
/* send a request to the kernel to add a IPv6 Proxy entry to the neighbour table */
int ipv6_proxy_ndp_address_configure(Link *link, IPv6ProxyNDPAddress *ipv6_proxy_ndp_address) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
sd_netlink *rtnl;
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(ipv6_proxy_ndp_address);
rtnl = link->manager->rtnl;
/* create new netlink message */
r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, AF_INET6);
if (r < 0)
return rtnl_log_create_error(r);
r = sd_rtnl_message_neigh_set_flags(req, NLM_F_REQUEST | NTF_PROXY);
if (r < 0)
return rtnl_log_create_error(r);
r = sd_netlink_message_append_in6_addr(req, NDA_DST, &ipv6_proxy_ndp_address->in_addr);
if (r < 0)
return rtnl_log_create_error(r);
r = netlink_call_async(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;
}
/* configure all ipv6 proxy ndp addresses */
int ipv6_proxy_ndp_addresses_configure(Link *link) {
IPv6ProxyNDPAddress *ipv6_proxy_ndp_address;
int r;
assert(link);
/* 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 r;
LIST_FOREACH(ipv6_proxy_ndp_addresses, ipv6_proxy_ndp_address, link->network->ipv6_proxy_ndp_addresses) {
r = ipv6_proxy_ndp_address_configure(link, ipv6_proxy_ndp_address);
if (r != 0)
return r;
}
return 0;
}
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