diff options
Diffstat (limited to 'src/network/networkd-ipv6-proxy-ndp.c')
| -rw-r--r-- | src/network/networkd-ipv6-proxy-ndp.c | 204 |
1 files changed, 204 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..f594b27 --- /dev/null +++ b/src/network/networkd-ipv6-proxy-ndp.c @@ -0,0 +1,204 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <netinet/ether.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 "string-util.h" +#include "socket-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) { + const char *p = NULL; + int r, v; + + assert(link); + + if (!socket_ipv6_is_supported()) + return 0; + + v = ipv6_proxy_ndp_is_needed(link); + p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/proxy_ndp"); + + r = write_string_file(p, one_zero(v), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_link_warning_errno(link, r, "Cannot configure proxy NDP for interface: %m"); + + return 0; +} + +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; + } + + r = in_addr_is_null(AF_INET6, &buffer); + if (r != 0) { + log_syntax(unit, LOG_ERR, filename, line, r, + "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; +} |