/*** This file is part of systemd. Copyright 2017 Florian Klink <flokli@flokli.de> systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #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" 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->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); 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); 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 = new0(IPv6ProxyNDPAddress, 1); if (!ipv6_proxy_ndp_address) return -ENOMEM; ipv6_proxy_ndp_address->network = network; LIST_PREPEND(ipv6_proxy_ndp_addresses, network->ipv6_proxy_ndp_addresses, ipv6_proxy_ndp_address); network->n_ipv6_proxy_ndp_addresses++; *ret = ipv6_proxy_ndp_address; ipv6_proxy_ndp_address = NULL; 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 can not 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, void *userdata) { Link *link = userdata; 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 = sd_netlink_call_async(rtnl, req, set_ipv6_proxy_ndp_address_handler, link, 0, NULL); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); return 0; } /* configure all ipv6 proxy ndp addresses */ int ipv6_proxy_ndp_addresses_configure(Link *link) { IPv6ProxyNDPAddress *ipv6_proxy_ndp_address; int r; /* 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; }