src/network/networkd-ipv6-proxy-ndp.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <netinet/in.h>
   4 #include <linux/if.h>
   5
   6 #include "netlink-util.h"
   7 #include "networkd-ipv6-proxy-ndp.h"
   8 #include "networkd-link.h"
   9 #include "networkd-manager.h"
  10 #include "networkd-network.h"
  11 #include "networkd-queue.h"
  12 #include "socket-util.h"
  13 #include "string-util.h"
  14
  15 void network_adjust_ipv6_proxy_ndp(Network *network) {
  16         assert(network);
  17
  18         if (set_isempty(network->ipv6_proxy_ndp_addresses))
  19                 return;
  20
  21         if (!socket_ipv6_is_supported()) {
  22                 log_once(LOG_WARNING,
  23                          "%s: IPv6 proxy NDP addresses are set, but IPv6 is not supported by kernel, "
  24                          "Ignoring IPv6 proxy NDP addresses.", network->filename);
  25                 network->ipv6_proxy_ndp_addresses = set_free_free(network->ipv6_proxy_ndp_addresses);
  26         }
  27 }
  28
  29 static int ipv6_proxy_ndp_address_configure_handler(
  30                 sd_netlink *rtnl,
  31                 sd_netlink_message *m,
  32                 Request *req,
  33                 Link *link,
  34                 struct in6_addr *address) {
  35
  36         int r;
  37
  38         assert(m);
  39         assert(link);
  40
  41         r = sd_netlink_message_get_errno(m);
  42         if (r < 0)
  43                 log_link_message_warning_errno(link, m, r, "Could not add IPv6 proxy ndp address entry, ignoring");
  44
  45         if (link->static_ipv6_proxy_ndp_messages == 0) {
  46                 log_link_debug(link, "IPv6 proxy NDP addresses set.");
  47                 link->static_ipv6_proxy_ndp_configured = true;
  48                 link_check_ready(link);
  49         }
  50
  51         return 1;
  52 }
  53
  54 /* send a request to the kernel to add an IPv6 Proxy entry to the neighbour table */
  55 static int ipv6_proxy_ndp_address_configure(const struct in6_addr *address, Link *link, Request *req) {
  56         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
  57         int r;
  58
  59         assert(address);
  60         assert(link);
  61         assert(link->manager);
  62         assert(link->manager->rtnl);
  63         assert(req);
  64
  65         /* create new netlink message */
  66         r = sd_rtnl_message_new_neigh(link->manager->rtnl, &m, RTM_NEWNEIGH, link->ifindex, AF_INET6);
  67         if (r < 0)
  68                 return r;
  69
  70         r = sd_rtnl_message_neigh_set_flags(m, NTF_PROXY);
  71         if (r < 0)
  72                 return r;
  73
  74         r = sd_netlink_message_append_in6_addr(m, NDA_DST, address);
  75         if (r < 0)
  76                 return r;
  77
  78         return request_call_netlink_async(link->manager->rtnl, m, req);
  79 }
  80
  81 static int ipv6_proxy_ndp_address_process_request(Request *req, Link *link, struct in6_addr *address) {
  82         int r;
  83
  84         assert(req);
  85         assert(link);
  86         assert(address);
  87
  88         if (!link_is_ready_to_configure(link, false))
  89                 return 0;
  90
  91         r = ipv6_proxy_ndp_address_configure(address, link, req);
  92         if (r < 0)
  93                 return log_link_warning_errno(link, r, "Failed to configure IPv6 proxy NDP address: %m");
  94
  95         return 1;
  96 }
  97
  98 int link_request_static_ipv6_proxy_ndp_addresses(Link *link) {
  99         struct in6_addr *address;
 100         int r;
 101
 102         assert(link);
 103         assert(link->network);
 104
 105         link->static_ipv6_proxy_ndp_configured = false;
 106
 107         SET_FOREACH(address, link->network->ipv6_proxy_ndp_addresses) {
 108                 r = link_queue_request_safe(link, REQUEST_TYPE_IPV6_PROXY_NDP,
 109                                             address, NULL,
 110                                             in6_addr_hash_func,
 111                                             in6_addr_compare_func,
 112                                             ipv6_proxy_ndp_address_process_request,
 113                                             &link->static_ipv6_proxy_ndp_messages,
 114                                             ipv6_proxy_ndp_address_configure_handler,
 115                                             NULL);
 116                 if (r < 0)
 117                         return log_link_warning_errno(link, r, "Failed to request IPv6 proxy NDP address: %m");
 118         }
 119
 120         if (link->static_ipv6_proxy_ndp_messages == 0) {
 121                 link->static_ipv6_proxy_ndp_configured = true;
 122                 link_check_ready(link);
 123         } else {
 124                 log_link_debug(link, "Setting IPv6 proxy NDP addresses.");
 125                 link_set_state(link, LINK_STATE_CONFIGURING);
 126         }
 127
 128         return 0;
 129 }
 130
 131 int config_parse_ipv6_proxy_ndp_address(
 132                 const char *unit,
 133                 const char *filename,
 134                 unsigned line,
 135                 const char *section,
 136                 unsigned section_line,
 137                 const char *lvalue,
 138                 int ltype,
 139                 const char *rvalue,
 140                 void *data,
 141                 void *userdata) {
 142
 143         _cleanup_free_ struct in6_addr *address = NULL;
 144         Network *network = ASSERT_PTR(userdata);
 145         union in_addr_union buffer;
 146         int r;
 147
 148         assert(filename);
 149         assert(rvalue);
 150
 151         if (isempty(rvalue)) {
 152                 network->ipv6_proxy_ndp_addresses = set_free_free(network->ipv6_proxy_ndp_addresses);
 153                 return 0;
 154         }
 155
 156         r = in_addr_from_string(AF_INET6, rvalue, &buffer);
 157         if (r < 0) {
 158                 log_syntax(unit, LOG_WARNING, filename, line, r,
 159                            "Failed to parse IPv6 proxy NDP address, ignoring: %s", rvalue);
 160                 return 0;
 161         }
 162
 163         if (in_addr_is_null(AF_INET6, &buffer)) {
 164                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 165                            "IPv6 proxy NDP address cannot be the ANY address, ignoring: %s", rvalue);
 166                 return 0;
 167         }
 168
 169         address = newdup(struct in6_addr, &buffer.in6, 1);
 170         if (!address)
 171                 return log_oom();
 172
 173         r = set_ensure_put(&network->ipv6_proxy_ndp_addresses, &in6_addr_hash_ops, address);
 174         if (r < 0)
 175                 return log_oom();
 176         if (r > 0)
 177                 TAKE_PTR(address);
 178
 179         return 0;
 180 }