src/network/networkd-address-label.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <net/if.h>
   4 #include <linux/if_addrlabel.h>
   5
   6 #include "alloc-util.h"
   7 #include "netlink-util.h"
   8 #include "networkd-address-label.h"
   9 #include "networkd-link.h"
  10 #include "networkd-manager.h"
  11 #include "networkd-network.h"
  12 #include "networkd-queue.h"
  13 #include "parse-util.h"
  14
  15 AddressLabel *address_label_free(AddressLabel *label) {
  16         if (!label)
  17                 return NULL;
  18
  19         if (label->network) {
  20                 assert(label->section);
  21                 hashmap_remove(label->network->address_labels_by_section, label->section);
  22         }
  23
  24         config_section_free(label->section);
  25         return mfree(label);
  26 }
  27
  28 DEFINE_SECTION_CLEANUP_FUNCTIONS(AddressLabel, address_label_free);
  29
  30 static int address_label_new_static(Network *network, const char *filename, unsigned section_line, AddressLabel **ret) {
  31         _cleanup_(config_section_freep) ConfigSection *n = NULL;
  32         _cleanup_(address_label_freep) AddressLabel *label = NULL;
  33         int r;
  34
  35         assert(network);
  36         assert(ret);
  37         assert(filename);
  38         assert(section_line > 0);
  39
  40         r = config_section_new(filename, section_line, &n);
  41         if (r < 0)
  42                 return r;
  43
  44         label = hashmap_get(network->address_labels_by_section, n);
  45         if (label) {
  46                 *ret = TAKE_PTR(label);
  47                 return 0;
  48         }
  49
  50         label = new(AddressLabel, 1);
  51         if (!label)
  52                 return -ENOMEM;
  53
  54         *label = (AddressLabel) {
  55                 .network = network,
  56                 .section = TAKE_PTR(n),
  57                 .label = UINT32_MAX,
  58         };
  59
  60         r = hashmap_ensure_put(&network->address_labels_by_section, &config_section_hash_ops, label->section, label);
  61         if (r < 0)
  62                 return r;
  63
  64         *ret = TAKE_PTR(label);
  65         return 0;
  66 }
  67
  68 static int address_label_configure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
  69         int r;
  70
  71         assert(rtnl);
  72         assert(m);
  73         assert(link);
  74         assert(link->ifname);
  75         assert(link->static_address_label_messages > 0);
  76
  77         link->static_address_label_messages--;
  78
  79         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
  80                 return 1;
  81
  82         r = sd_netlink_message_get_errno(m);
  83         if (r < 0 && r != -EEXIST) {
  84                 log_link_message_warning_errno(link, m, r, "Could not set address label");
  85                 link_enter_failed(link);
  86                 return 1;
  87         }
  88
  89         if (link->static_address_label_messages == 0) {
  90                 log_link_debug(link, "Addresses label set");
  91                 link->static_address_labels_configured = true;
  92                 link_check_ready(link);
  93         }
  94
  95         return 1;
  96 }
  97
  98 static int address_label_configure(AddressLabel *label, Link *link, link_netlink_message_handler_t callback) {
  99         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 100         int r;
 101
 102         assert(label);
 103         assert(link);
 104         assert(link->ifindex > 0);
 105         assert(link->manager);
 106         assert(link->manager->rtnl);
 107         assert(callback);
 108
 109         r = sd_rtnl_message_new_addrlabel(link->manager->rtnl, &req, RTM_NEWADDRLABEL,
 110                                           link->ifindex, AF_INET6);
 111         if (r < 0)
 112                 return log_link_error_errno(link, r, "Could not allocate RTM_NEWADDR message: %m");
 113
 114         r = sd_rtnl_message_addrlabel_set_prefixlen(req, label->prefixlen);
 115         if (r < 0)
 116                 return log_link_error_errno(link, r, "Could not set prefixlen: %m");
 117
 118         r = sd_netlink_message_append_u32(req, IFAL_LABEL, label->label);
 119         if (r < 0)
 120                 return log_link_error_errno(link, r, "Could not append IFAL_LABEL attribute: %m");
 121
 122         r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &label->prefix);
 123         if (r < 0)
 124                 return log_link_error_errno(link, r, "Could not append IFA_ADDRESS attribute: %m");
 125
 126         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
 127                                link_netlink_destroy_callback, link);
 128         if (r < 0)
 129                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 130
 131         link_ref(link);
 132
 133         return 1;
 134 }
 135
 136 int link_request_static_address_labels(Link *link) {
 137         AddressLabel *label;
 138         int r;
 139
 140         assert(link);
 141         assert(link->network);
 142
 143         link->static_address_labels_configured = false;
 144
 145         HASHMAP_FOREACH(label, link->network->address_labels_by_section) {
 146                 r = link_queue_request(link, REQUEST_TYPE_ADDRESS_LABEL, label, false,
 147                                        &link->static_address_label_messages, address_label_configure_handler, NULL);
 148                 if (r < 0)
 149                         return log_link_warning_errno(link, r, "Failed to request address label: %m");
 150         }
 151
 152         if (link->static_address_label_messages == 0) {
 153                 link->static_address_labels_configured = true;
 154                 link_check_ready(link);
 155         } else {
 156                 log_link_debug(link, "Setting address labels.");
 157                 link_set_state(link, LINK_STATE_CONFIGURING);
 158         }
 159
 160         return 0;
 161 }
 162
 163 int request_process_address_label(Request *req) {
 164         assert(req);
 165         assert(req->link);
 166         assert(req->label);
 167         assert(req->type == REQUEST_TYPE_ADDRESS_LABEL);
 168
 169         if (!link_is_ready_to_configure(req->link, false))
 170                 return 0;
 171
 172         return address_label_configure(req->label, req->link, req->netlink_handler);
 173 }
 174
 175 static int address_label_section_verify(AddressLabel *label) {
 176         assert(label);
 177         assert(label->section);
 178
 179         if (section_is_invalid(label->section))
 180                 return -EINVAL;
 181
 182         if (!label->prefix_set)
 183                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 184                                          "%s: [IPv6AddressLabel] section without Prefix= setting specified. "
 185                                          "Ignoring [IPv6AddressLabel] section from line %u.",
 186                                          label->section->filename, label->section->line);
 187
 188         if (label->label == UINT32_MAX)
 189                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 190                                          "%s: [IPv6AddressLabel] section without Label= setting specified. "
 191                                          "Ignoring [IPv6AddressLabel] section from line %u.",
 192                                          label->section->filename, label->section->line);
 193
 194         return 0;
 195 }
 196
 197 void network_drop_invalid_address_labels(Network *network) {
 198         AddressLabel *label;
 199
 200         assert(network);
 201
 202         HASHMAP_FOREACH(label, network->address_labels_by_section)
 203                 if (address_label_section_verify(label) < 0)
 204                         address_label_free(label);
 205 }
 206
 207 int config_parse_address_label_prefix(
 208                 const char *unit,
 209                 const char *filename,
 210                 unsigned line,
 211                 const char *section,
 212                 unsigned section_line,
 213                 const char *lvalue,
 214                 int ltype,
 215                 const char *rvalue,
 216                 void *data,
 217                 void *userdata) {
 218
 219         _cleanup_(address_label_free_or_set_invalidp) AddressLabel *n = NULL;
 220         Network *network = userdata;
 221         unsigned char prefixlen;
 222         union in_addr_union a;
 223         int r;
 224
 225         assert(filename);
 226         assert(section);
 227         assert(lvalue);
 228         assert(rvalue);
 229         assert(data);
 230
 231         r = address_label_new_static(network, filename, section_line, &n);
 232         if (r < 0)
 233                 return log_oom();
 234
 235         r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &prefixlen);
 236         if (r < 0) {
 237                 log_syntax(unit, LOG_WARNING, filename, line, r,
 238                            "Invalid prefix for address label, ignoring assignment: %s", rvalue);
 239                 return 0;
 240         }
 241         if (in6_addr_is_ipv4_mapped_address(&a.in6) && prefixlen > 96) {
 242                 /* See ip6addrlbl_alloc() in net/ipv6/addrlabel.c of kernel. */
 243                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 244                            "The prefix length of IPv4 mapped address for address label must be equal to or smaller than 96, "
 245                            "ignoring assignment: %s", rvalue);
 246                 return 0;
 247         }
 248
 249         n->prefix = a.in6;
 250         n->prefixlen = prefixlen;
 251         n->prefix_set = true;
 252
 253         TAKE_PTR(n);
 254         return 0;
 255 }
 256
 257 int config_parse_address_label(
 258                 const char *unit,
 259                 const char *filename,
 260                 unsigned line,
 261                 const char *section,
 262                 unsigned section_line,
 263                 const char *lvalue,
 264                 int ltype,
 265                 const char *rvalue,
 266                 void *data,
 267                 void *userdata) {
 268
 269         _cleanup_(address_label_free_or_set_invalidp) AddressLabel *n = NULL;
 270         Network *network = userdata;
 271         uint32_t k;
 272         int r;
 273
 274         assert(filename);
 275         assert(section);
 276         assert(lvalue);
 277         assert(rvalue);
 278         assert(data);
 279
 280         r = address_label_new_static(network, filename, section_line, &n);
 281         if (r < 0)
 282                 return log_oom();
 283
 284         r = safe_atou32(rvalue, &k);
 285         if (r < 0) {
 286                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse address label, ignoring: %s", rvalue);
 287                 return 0;
 288         }
 289
 290         if (k == UINT_MAX) {
 291                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Address label is invalid, ignoring: %s", rvalue);
 292                 return 0;
 293         }
 294
 295         n->label = k;
 296         TAKE_PTR(n);
 297
 298         return 0;
 299 }