src/network/netdev/geneve.c

   1 /***
   2     This file is part of systemd.
   3
   4     Copyright 2017 Susant Sahani
   5
   6     systemd is free software; you can redistribute it and/or modify it
   7     under the terms of the GNU Lesser General Public License as published by
   8     the Free Software Foundation; either version 2.1 of the License, or
   9     (at your option) any later version.
  10
  11     systemd is distributed in the hope that it will be useful, but
  12     WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14     Lesser General Public License for more details.
  15
  16     You should have received a copy of the GNU Lesser General Public License
  17     along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <net/if.h>
  21
  22 #include "alloc-util.h"
  23 #include "conf-parser.h"
  24 #include "extract-word.h"
  25 #include "geneve.h"
  26 #include "parse-util.h"
  27 #include "sd-netlink.h"
  28 #include "string-util.h"
  29 #include "strv.h"
  30 #include "missing.h"
  31 #include "networkd-manager.h"
  32
  33 #define GENEVE_FLOW_LABEL_MAX_MASK 0xFFFFFU
  34 #define DEFAULT_GENEVE_DESTINATION_PORT 6081
  35
  36 /* callback for geneve netdev's created without a backing Link */
  37 static int geneve_netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
  38         _cleanup_netdev_unref_ NetDev *netdev = userdata;
  39         int r;
  40
  41         assert(netdev->state != _NETDEV_STATE_INVALID);
  42
  43         r = sd_netlink_message_get_errno(m);
  44         if (r == -EEXIST)
  45                 log_netdev_info(netdev, "Geneve netdev exists, using existing without changing its parameters");
  46         else if (r < 0) {
  47                 log_netdev_warning_errno(netdev, r, "Geneve netdev could not be created: %m");
  48                 netdev_drop(netdev);
  49
  50                 return 1;
  51         }
  52
  53         log_netdev_debug(netdev, "Geneve created");
  54
  55         return 1;
  56 }
  57
  58 static int netdev_geneve_create(NetDev *netdev) {
  59         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
  60         Geneve *v;
  61         int r;
  62
  63         assert(netdev);
  64
  65         v = GENEVE(netdev);
  66
  67         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
  68         if (r < 0)
  69                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
  70
  71         r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
  72         if (r < 0)
  73                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
  74
  75         if (netdev->mac) {
  76                 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
  77                 if (r < 0)
  78                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
  79         }
  80
  81         if (netdev->mtu) {
  82                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
  83                 if (r < 0)
  84                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
  85         }
  86
  87         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
  88         if (r < 0)
  89                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
  90
  91         r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
  92         if (r < 0)
  93                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
  94
  95         if (v->id <= GENEVE_VID_MAX) {
  96                 r = sd_netlink_message_append_u32(m, IFLA_GENEVE_ID, v->id);
  97                 if (r < 0)
  98                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_ID attribute: %m");
  99         }
 100
 101         if (!in_addr_is_null(v->remote_family, &v->remote)) {
 102
 103                 if (v->remote_family == AF_INET)
 104                         r = sd_netlink_message_append_in_addr(m, IFLA_GENEVE_REMOTE, &v->remote.in);
 105                 else
 106                         r = sd_netlink_message_append_in6_addr(m, IFLA_GENEVE_REMOTE6, &v->remote.in6);
 107
 108                 if (r < 0)
 109                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_GROUP attribute: %m");
 110
 111         }
 112
 113         if (v->ttl) {
 114                 r = sd_netlink_message_append_u8(m, IFLA_GENEVE_TTL, v->ttl);
 115                 if (r < 0)
 116                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_TTL attribute: %m");
 117         }
 118
 119         r = sd_netlink_message_append_u8(m, IFLA_GENEVE_TOS, v->tos);
 120         if (r < 0)
 121                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_TOS attribute: %m");
 122
 123         r = sd_netlink_message_append_u8(m, IFLA_GENEVE_UDP_CSUM, v->udpcsum);
 124         if (r < 0)
 125                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_UDP_CSUM attribute: %m");
 126
 127         r = sd_netlink_message_append_u8(m, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, v->udp6zerocsumtx);
 128         if (r < 0)
 129                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_UDP_ZERO_CSUM6_TX attribute: %m");
 130
 131         r = sd_netlink_message_append_u8(m, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, v->udp6zerocsumrx);
 132         if (r < 0)
 133                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_UDP_ZERO_CSUM6_RX attribute: %m");
 134
 135         if (v->dest_port != DEFAULT_GENEVE_DESTINATION_PORT) {
 136                 r = sd_netlink_message_append_u16(m, IFLA_GENEVE_PORT, htobe16(v->dest_port));
 137                 if (r < 0)
 138                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_PORT attribute: %m");
 139         }
 140
 141         if (v->flow_label > 0) {
 142                 r = sd_netlink_message_append_u32(m, IFLA_GENEVE_LABEL, htobe32(v->flow_label));
 143                 if (r < 0)
 144                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_LABEL attribute: %m");
 145         }
 146
 147         r = sd_netlink_message_close_container(m);
 148         if (r < 0)
 149                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 150
 151         r = sd_netlink_message_close_container(m);
 152         if (r < 0)
 153                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 154
 155         r = sd_netlink_call_async(netdev->manager->rtnl, m, geneve_netdev_create_handler, netdev, 0, NULL);
 156         if (r < 0)
 157                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 158
 159         netdev_ref(netdev);
 160
 161         netdev->state = NETDEV_STATE_CREATING;
 162
 163         log_netdev_debug(netdev, "Creating");
 164
 165
 166         return r;
 167 }
 168
 169 int config_parse_geneve_vni(const char *unit,
 170                            const char *filename,
 171                            unsigned line,
 172                            const char *section,
 173                            unsigned section_line,
 174                            const char *lvalue,
 175                            int ltype,
 176                            const char *rvalue,
 177                            void *data,
 178                            void *userdata) {
 179         Geneve *v = userdata;
 180         uint32_t f;
 181         int r;
 182
 183         assert(filename);
 184         assert(lvalue);
 185         assert(rvalue);
 186         assert(data);
 187
 188         r = safe_atou32(rvalue, &f);
 189         if (r < 0) {
 190                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve VNI '%s'.", rvalue);
 191                 return 0;
 192         }
 193
 194         if (f > GENEVE_VID_MAX){
 195                 log_syntax(unit, LOG_ERR, filename, line, r, "Geneve VNI out is of range '%s'.", rvalue);
 196                 return 0;
 197         }
 198
 199         v->id = f;
 200
 201         return 0;
 202 }
 203
 204 int config_parse_geneve_address(const char *unit,
 205                                 const char *filename,
 206                                 unsigned line,
 207                                 const char *section,
 208                                 unsigned section_line,
 209                                 const char *lvalue,
 210                                 int ltype,
 211                                 const char *rvalue,
 212                                 void *data,
 213                                 void *userdata) {
 214         Geneve *v = userdata;
 215         union in_addr_union *addr = data, buffer;
 216         int r, f;
 217
 218         assert(filename);
 219         assert(lvalue);
 220         assert(rvalue);
 221         assert(data);
 222
 223         r = in_addr_from_string_auto(rvalue, &f, &buffer);
 224         if (r < 0) {
 225                 log_syntax(unit, LOG_ERR, filename, line, r, "geneve '%s' address is invalid, ignoring assignment: %s", lvalue, rvalue);
 226                 return 0;
 227         }
 228
 229         r = in_addr_is_multicast(f, &buffer);
 230         if (r > 0) {
 231                 log_syntax(unit, LOG_ERR, filename, line, 0, "geneve invalid multicast '%s' address, ignoring assignment: %s", lvalue, rvalue);
 232                 return 0;
 233         }
 234
 235         v->remote_family = f;
 236         *addr = buffer;
 237
 238         return 0;
 239 }
 240
 241 int config_parse_geneve_destination_port(const char *unit,
 242                                          const char *filename,
 243                                          unsigned line,
 244                                          const char *section,
 245                                          unsigned section_line,
 246                                          const char *lvalue,
 247                                          int ltype,
 248                                          const char *rvalue,
 249                                          void *data,
 250                                          void *userdata) {
 251         Geneve *v = userdata;
 252         uint16_t port;
 253         int r;
 254
 255         assert(filename);
 256         assert(lvalue);
 257         assert(rvalue);
 258         assert(data);
 259
 260         r = parse_ip_port(rvalue, &port);
 261         if (r < 0) {
 262                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve destination port '%s'.", rvalue);
 263                 return 0;
 264         }
 265
 266         v->dest_port = port;
 267
 268         return 0;
 269 }
 270
 271 int config_parse_geneve_flow_label(const char *unit,
 272                                    const char *filename,
 273                                    unsigned line,
 274                                    const char *section,
 275                                    unsigned section_line,
 276                                    const char *lvalue,
 277                                    int ltype,
 278                                    const char *rvalue,
 279                                    void *data,
 280                                    void *userdata) {
 281         Geneve *v = userdata;
 282         uint32_t f;
 283         int r;
 284
 285         assert(filename);
 286         assert(lvalue);
 287         assert(rvalue);
 288         assert(data);
 289
 290         r = safe_atou32(rvalue, &f);
 291         if (r < 0) {
 292                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve flow label '%s'.", rvalue);
 293                 return 0;
 294         }
 295
 296         if (f & ~GENEVE_FLOW_LABEL_MAX_MASK) {
 297                 log_syntax(unit, LOG_ERR, filename, line, r,
 298                            "Geneve flow label '%s' not valid. Flow label range should be [0-1048575].", rvalue);
 299                 return 0;
 300         }
 301
 302         v->flow_label = f;
 303
 304         return 0;
 305 }
 306
 307 static int netdev_geneve_verify(NetDev *netdev, const char *filename) {
 308         Geneve *v = GENEVE(netdev);
 309
 310         assert(netdev);
 311         assert(v);
 312         assert(filename);
 313
 314         if (v->ttl == 0) {
 315                 log_warning("Invalid Geneve TTL value '0' configured in '%s'. Ignoring", filename);
 316                 return -EINVAL;
 317         }
 318
 319         return 0;
 320 }
 321
 322 static void geneve_init(NetDev *netdev) {
 323         Geneve *v;
 324
 325         assert(netdev);
 326
 327         v = GENEVE(netdev);
 328
 329         assert(v);
 330
 331         v->id = GENEVE_VID_MAX + 1;
 332         v->dest_port = DEFAULT_GENEVE_DESTINATION_PORT;
 333         v->udpcsum = false;
 334         v->udp6zerocsumtx = false;
 335         v->udp6zerocsumrx = false;
 336 }
 337
 338 const NetDevVTable geneve_vtable = {
 339         .object_size = sizeof(Geneve),
 340         .init = geneve_init,
 341         .sections = "Match\0NetDev\0GENEVE\0",
 342         .create = netdev_geneve_create,
 343         .create_type = NETDEV_CREATE_INDEPENDENT,
 344         .config_verify = netdev_geneve_verify,
 345 };