src/network/netdev/geneve.c

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