diff options
Diffstat (limited to '')
| -rw-r--r-- | src/network/networkd-ipv6-proxy-ndp.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/network/networkd-ipv6-proxy-ndp.c b/src/network/networkd-ipv6-proxy-ndp.c new file mode 100644 index 0000000..7a370e9 --- /dev/null +++ b/src/network/networkd-ipv6-proxy-ndp.c @@ -0,0 +1,164 @@ +/* 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; +} |