ip/iplink_vxlan.c

   1 /*
   2  * iplink_vxlan.c       VXLAN device support
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Stephen Hemminger <shemminger@vyatta.com
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <net/if.h>
  16 #include <linux/ip.h>
  17 #include <linux/if_link.h>
  18 #include <arpa/inet.h>
  19
  20 #include "rt_names.h"
  21 #include "utils.h"
  22 #include "ip_common.h"
  23
  24 static void print_explain(FILE *f)
  25 {
  26         fprintf(f, "Usage: ... vxlan id VNI [ { group | remote } IP_ADDRESS ] [ local ADDR ]\n");
  27         fprintf(f, "                 [ ttl TTL ] [ tos TOS ] [ flowlabel LABEL ] [ dev PHYS_DEV ]\n");
  28         fprintf(f, "                 [ dstport PORT ] [ srcport MIN MAX ]\n");
  29         fprintf(f, "                 [ [no]learning ] [ [no]proxy ] [ [no]rsc ]\n");
  30         fprintf(f, "                 [ [no]l2miss ] [ [no]l3miss ]\n");
  31         fprintf(f, "                 [ ageing SECONDS ] [ maxaddress NUMBER ]\n");
  32         fprintf(f, "                 [ [no]udpcsum ] [ [no]udp6zerocsumtx ] [ [no]udp6zerocsumrx ]\n");
  33         fprintf(f, "                 [ [no]remcsumtx ] [ [no]remcsumrx ]\n");
  34         fprintf(f, "                 [ [no]external ] [ gbp ]\n");
  35         fprintf(f, "\n");
  36         fprintf(f, "Where: VNI   := 0-16777215\n");
  37         fprintf(f, "       ADDR  := { IP_ADDRESS | any }\n");
  38         fprintf(f, "       TOS   := { NUMBER | inherit }\n");
  39         fprintf(f, "       TTL   := { 1..255 | inherit }\n");
  40         fprintf(f, "       LABEL := 0-1048575\n");
  41 }
  42
  43 static void explain(void)
  44 {
  45         print_explain(stderr);
  46 }
  47
  48 static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
  49                           struct nlmsghdr *n)
  50 {
  51         __u32 vni = 0;
  52         int vni_set = 0;
  53         __u32 saddr = 0;
  54         __u32 gaddr = 0;
  55         __u32 daddr = 0;
  56         struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
  57         struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
  58         struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
  59         unsigned int link = 0;
  60         __u8 tos = 0;
  61         __u8 ttl = 0;
  62         __u32 label = 0;
  63         __u8 learning = 1;
  64         __u8 proxy = 0;
  65         __u8 rsc = 0;
  66         __u8 l2miss = 0;
  67         __u8 l3miss = 0;
  68         __u8 noage = 0;
  69         __u32 age = 0;
  70         __u32 maxaddr = 0;
  71         __u16 dstport = 0;
  72         __u8 udpcsum = 0;
  73         bool udpcsum_set = false;
  74         __u8 udp6zerocsumtx = 0;
  75         bool udp6zerocsumtx_set = false;
  76         __u8 udp6zerocsumrx = 0;
  77         bool udp6zerocsumrx_set = false;
  78         __u8 remcsumtx = 0;
  79         __u8 remcsumrx = 0;
  80         __u8 metadata = 0;
  81         __u8 gbp = 0;
  82         int dst_port_set = 0;
  83         struct ifla_vxlan_port_range range = { 0, 0 };
  84
  85         while (argc > 0) {
  86                 if (!matches(*argv, "id") ||
  87                     !matches(*argv, "vni")) {
  88                         NEXT_ARG();
  89                         if (get_u32(&vni, *argv, 0) ||
  90                             vni >= 1u << 24)
  91                                 invarg("invalid id", *argv);
  92                         vni_set = 1;
  93                 } else if (!matches(*argv, "group")) {
  94                         NEXT_ARG();
  95                         if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
  96                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  97                                 return -1;
  98                         }
  99                         if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
 100                                 invarg("invalid group address", *argv);
 101                 } else if (!matches(*argv, "remote")) {
 102                         NEXT_ARG();
 103                         if (!inet_get_addr(*argv, &daddr, &daddr6)) {
 104                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 105                                 return -1;
 106                         }
 107                         if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
 108                                 invarg("invalid remote address", *argv);
 109                 } else if (!matches(*argv, "local")) {
 110                         NEXT_ARG();
 111                         if (strcmp(*argv, "any")) {
 112                                 if (!inet_get_addr(*argv, &saddr, &saddr6)) {
 113                                         fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 114                                         return -1;
 115                                 }
 116                         }
 117
 118                         if (IN_MULTICAST(ntohl(saddr)) || IN6_IS_ADDR_MULTICAST(&saddr6))
 119                                 invarg("invalid local address", *argv);
 120                 } else if (!matches(*argv, "dev")) {
 121                         NEXT_ARG();
 122                         link = if_nametoindex(*argv);
 123                         if (link == 0) {
 124                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 125                                         *argv);
 126                                 exit(-1);
 127                         }
 128                 } else if (!matches(*argv, "ttl") ||
 129                            !matches(*argv, "hoplimit")) {
 130                         unsigned int uval;
 131
 132                         NEXT_ARG();
 133                         if (strcmp(*argv, "inherit") != 0) {
 134                                 if (get_unsigned(&uval, *argv, 0))
 135                                         invarg("invalid TTL", *argv);
 136                                 if (uval > 255)
 137                                         invarg("TTL must be <= 255", *argv);
 138                                 ttl = uval;
 139                         }
 140                 } else if (!matches(*argv, "tos") ||
 141                            !matches(*argv, "dsfield")) {
 142                         __u32 uval;
 143
 144                         NEXT_ARG();
 145                         if (strcmp(*argv, "inherit") != 0) {
 146                                 if (rtnl_dsfield_a2n(&uval, *argv))
 147                                         invarg("bad TOS value", *argv);
 148                                 tos = uval;
 149                         } else
 150                                 tos = 1;
 151                 } else if (!matches(*argv, "label") ||
 152                            !matches(*argv, "flowlabel")) {
 153                         __u32 uval;
 154
 155                         NEXT_ARG();
 156                         if (get_u32(&uval, *argv, 0) ||
 157                             (uval & ~LABEL_MAX_MASK))
 158                                 invarg("invalid flowlabel", *argv);
 159                         label = htonl(uval);
 160                 } else if (!matches(*argv, "ageing")) {
 161                         NEXT_ARG();
 162                         if (strcmp(*argv, "none") == 0)
 163                                 noage = 1;
 164                         else if (get_u32(&age, *argv, 0))
 165                                 invarg("ageing timer", *argv);
 166                 } else if (!matches(*argv, "maxaddress")) {
 167                         NEXT_ARG();
 168                         if (strcmp(*argv, "unlimited") == 0)
 169                                 maxaddr = 0;
 170                         else if (get_u32(&maxaddr, *argv, 0))
 171                                 invarg("max addresses", *argv);
 172                 } else if (!matches(*argv, "port") ||
 173                            !matches(*argv, "srcport")) {
 174                         __u16 minport, maxport;
 175
 176                         NEXT_ARG();
 177                         if (get_u16(&minport, *argv, 0))
 178                                 invarg("min port", *argv);
 179                         NEXT_ARG();
 180                         if (get_u16(&maxport, *argv, 0))
 181                                 invarg("max port", *argv);
 182                         range.low = htons(minport);
 183                         range.high = htons(maxport);
 184                 } else if (!matches(*argv, "dstport")) {
 185                         NEXT_ARG();
 186                         if (get_u16(&dstport, *argv, 0))
 187                                 invarg("dst port", *argv);
 188                         dst_port_set = 1;
 189                 } else if (!matches(*argv, "nolearning")) {
 190                         learning = 0;
 191                 } else if (!matches(*argv, "learning")) {
 192                         learning = 1;
 193                 } else if (!matches(*argv, "noproxy")) {
 194                         proxy = 0;
 195                 } else if (!matches(*argv, "proxy")) {
 196                         proxy = 1;
 197                 } else if (!matches(*argv, "norsc")) {
 198                         rsc = 0;
 199                 } else if (!matches(*argv, "rsc")) {
 200                         rsc = 1;
 201                 } else if (!matches(*argv, "nol2miss")) {
 202                         l2miss = 0;
 203                 } else if (!matches(*argv, "l2miss")) {
 204                         l2miss = 1;
 205                 } else if (!matches(*argv, "nol3miss")) {
 206                         l3miss = 0;
 207                 } else if (!matches(*argv, "l3miss")) {
 208                         l3miss = 1;
 209                 } else if (!matches(*argv, "udpcsum")) {
 210                         udpcsum = 1;
 211                         udpcsum_set = true;
 212                 } else if (!matches(*argv, "noudpcsum")) {
 213                         udpcsum = 0;
 214                         udpcsum_set = true;
 215                 } else if (!matches(*argv, "udp6zerocsumtx")) {
 216                         udp6zerocsumtx = 1;
 217                         udp6zerocsumtx_set = true;
 218                 } else if (!matches(*argv, "noudp6zerocsumtx")) {
 219                         udp6zerocsumtx = 0;
 220                         udp6zerocsumtx_set = true;
 221                 } else if (!matches(*argv, "udp6zerocsumrx")) {
 222                         udp6zerocsumrx = 1;
 223                         udp6zerocsumrx_set = true;
 224                 } else if (!matches(*argv, "noudp6zerocsumrx")) {
 225                         udp6zerocsumrx = 0;
 226                         udp6zerocsumrx_set = true;
 227                 } else if (!matches(*argv, "remcsumtx")) {
 228                         remcsumtx = 1;
 229                 } else if (!matches(*argv, "noremcsumtx")) {
 230                         remcsumtx = 0;
 231                 } else if (!matches(*argv, "remcsumrx")) {
 232                         remcsumrx = 1;
 233                 } else if (!matches(*argv, "noremcsumrx")) {
 234                         remcsumrx = 0;
 235                 } else if (!matches(*argv, "external")) {
 236                         metadata = 1;
 237                         learning = 0;
 238                 } else if (!matches(*argv, "noexternal")) {
 239                         metadata = 0;
 240                 } else if (!matches(*argv, "gbp")) {
 241                         gbp = 1;
 242                 } else if (matches(*argv, "help") == 0) {
 243                         explain();
 244                         return -1;
 245                 } else {
 246                         fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 247                         explain();
 248                         return -1;
 249                 }
 250                 argc--, argv++;
 251         }
 252
 253         if (metadata && vni_set) {
 254                 fprintf(stderr, "vxlan: both 'external' and vni cannot be specified\n");
 255                 return -1;
 256         }
 257
 258         if (!metadata && !vni_set) {
 259                 fprintf(stderr, "vxlan: missing virtual network identifier\n");
 260                 return -1;
 261         }
 262
 263         if ((gaddr && daddr) ||
 264                 (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
 265                  memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
 266                 fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 267                 return -1;
 268         }
 269
 270         if (!dst_port_set) {
 271                 fprintf(stderr, "vxlan: destination port not specified\n"
 272                         "Will use Linux kernel default (non-standard value)\n");
 273                 fprintf(stderr,
 274                         "Use 'dstport 4789' to get the IANA assigned value\n"
 275                         "Use 'dstport 0' to get default and quiet this message\n");
 276         }
 277
 278         addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 279         if (gaddr)
 280                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 281         else if (daddr)
 282                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 283         if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
 284                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 285         else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
 286                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 287
 288         if (saddr)
 289                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 290         else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
 291                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));
 292
 293         if (link)
 294                 addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 295         addattr32(n, 1024, IFLA_VXLAN_LABEL, label);
 296         addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 297         addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 298         addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 299         addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 300         addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 301         addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 302         addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 303         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_TX, remcsumtx);
 304         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_RX, remcsumrx);
 305         addattr8(n, 1024, IFLA_VXLAN_COLLECT_METADATA, metadata);
 306
 307         if (udpcsum_set)
 308                 addattr8(n, 1024, IFLA_VXLAN_UDP_CSUM, udpcsum);
 309         if (udp6zerocsumtx_set)
 310                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
 311         if (udp6zerocsumrx_set)
 312                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
 313         if (noage)
 314                 addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 315         else if (age)
 316                 addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 317         if (maxaddr)
 318                 addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 319         if (range.low || range.high)
 320                 addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 321                           &range, sizeof(range));
 322         if (dstport)
 323                 addattr16(n, 1024, IFLA_VXLAN_PORT, htons(dstport));
 324
 325         if (gbp)
 326                 addattr_l(n, 1024, IFLA_VXLAN_GBP, NULL, 0);
 327
 328
 329         return 0;
 330 }
 331
 332 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 333 {
 334         __u32 vni;
 335         unsigned int link;
 336         __u8 tos;
 337         __u32 maxaddr;
 338         char s2[64];
 339
 340         if (!tb)
 341                 return;
 342
 343         if (!tb[IFLA_VXLAN_ID] ||
 344             RTA_PAYLOAD(tb[IFLA_VXLAN_ID]) < sizeof(__u32))
 345                 return;
 346
 347         vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 348         fprintf(f, "id %u ", vni);
 349
 350         if (tb[IFLA_VXLAN_GROUP]) {
 351                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 352
 353                 if (addr) {
 354                         if (IN_MULTICAST(ntohl(addr)))
 355                                 fprintf(f, "group %s ",
 356                                         format_host(AF_INET, 4, &addr));
 357                         else
 358                                 fprintf(f, "remote %s ",
 359                                         format_host(AF_INET, 4, &addr));
 360                 }
 361         } else if (tb[IFLA_VXLAN_GROUP6]) {
 362                 struct in6_addr addr;
 363
 364                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 365                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
 366                         if (IN6_IS_ADDR_MULTICAST(&addr))
 367                                 fprintf(f, "group %s ",
 368                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 369                         else
 370                                 fprintf(f, "remote %s ",
 371                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 372                 }
 373         }
 374
 375         if (tb[IFLA_VXLAN_LOCAL]) {
 376                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 377
 378                 if (addr)
 379                         fprintf(f, "local %s ",
 380                                 format_host(AF_INET, 4, &addr));
 381         } else if (tb[IFLA_VXLAN_LOCAL6]) {
 382                 struct in6_addr addr;
 383
 384                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 385                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
 386                         fprintf(f, "local %s ",
 387                                 format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 388         }
 389
 390         if (tb[IFLA_VXLAN_LINK] &&
 391             (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 392                 const char *n = if_indextoname(link, s2);
 393
 394                 if (n)
 395                         fprintf(f, "dev %s ", n);
 396                 else
 397                         fprintf(f, "dev %u ", link);
 398         }
 399
 400         if (tb[IFLA_VXLAN_PORT_RANGE]) {
 401                 const struct ifla_vxlan_port_range *r
 402                         = RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 403                 fprintf(f, "srcport %u %u ", ntohs(r->low), ntohs(r->high));
 404         }
 405
 406         if (tb[IFLA_VXLAN_PORT])
 407                 fprintf(f, "dstport %u ",
 408                         ntohs(rta_getattr_u16(tb[IFLA_VXLAN_PORT])));
 409
 410         if (tb[IFLA_VXLAN_LEARNING] &&
 411             !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 412                 fputs("nolearning ", f);
 413
 414         if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 415                 fputs("proxy ", f);
 416
 417         if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 418                 fputs("rsc ", f);
 419
 420         if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 421                 fputs("l2miss ", f);
 422
 423         if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 424                 fputs("l3miss ", f);
 425
 426         if (tb[IFLA_VXLAN_TOS] &&
 427             (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 428                 if (tos == 1)
 429                         fprintf(f, "tos inherit ");
 430                 else
 431                         fprintf(f, "tos %#x ", tos);
 432         }
 433
 434         if (tb[IFLA_VXLAN_TTL]) {
 435                 __u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 436
 437                 if (ttl)
 438                         fprintf(f, "ttl %d ", ttl);
 439         }
 440
 441         if (tb[IFLA_VXLAN_LABEL]) {
 442                 __u32 label = rta_getattr_u32(tb[IFLA_VXLAN_LABEL]);
 443
 444                 if (label)
 445                         fprintf(f, "flowlabel %#x ", ntohl(label));
 446         }
 447
 448         if (tb[IFLA_VXLAN_AGEING]) {
 449                 __u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 450
 451                 if (age == 0)
 452                         fprintf(f, "ageing none ");
 453                 else
 454                         fprintf(f, "ageing %u ", age);
 455         }
 456
 457         if (tb[IFLA_VXLAN_LIMIT] &&
 458             ((maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT])) != 0))
 459                     fprintf(f, "maxaddr %u ", maxaddr);
 460
 461         if (tb[IFLA_VXLAN_UDP_CSUM]) {
 462                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_CSUM]))
 463                         fputs("no", f);
 464                 fputs("udpcsum ", f);
 465         }
 466
 467         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
 468                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
 469                         fputs("no", f);
 470                 fputs("udp6zerocsumtx ", f);
 471         }
 472
 473         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
 474                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
 475                         fputs("no", f);
 476                 fputs("udp6zerocsumrx ", f);
 477         }
 478
 479         if (tb[IFLA_VXLAN_REMCSUM_TX] &&
 480             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_TX]))
 481                 fputs("remcsumtx ", f);
 482
 483         if (tb[IFLA_VXLAN_REMCSUM_RX] &&
 484             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_RX]))
 485                 fputs("remcsumrx ", f);
 486
 487         if (tb[IFLA_VXLAN_COLLECT_METADATA] &&
 488             rta_getattr_u8(tb[IFLA_VXLAN_COLLECT_METADATA]))
 489                 fputs("external ", f);
 490
 491         if (tb[IFLA_VXLAN_GBP])
 492                 fputs("gbp ", f);
 493 }
 494
 495 static void vxlan_print_help(struct link_util *lu, int argc, char **argv,
 496         FILE *f)
 497 {
 498         print_explain(f);
 499 }
 500
 501 struct link_util vxlan_link_util = {
 502         .id             = "vxlan",
 503         .maxattr        = IFLA_VXLAN_MAX,
 504         .parse_opt      = vxlan_parse_opt,
 505         .print_opt      = vxlan_print_opt,
 506         .print_help     = vxlan_print_help,
 507 };