src/network/netdev/geneve.c

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