src/network/netdev/geneve.c

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