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                 } else if (!matches(*argv, "noexternal")) {
 238                         metadata = 0;
 239                 } else if (!matches(*argv, "gbp")) {
 240                         gbp = 1;
 241                 } else if (matches(*argv, "help") == 0) {
 242                         explain();
 243                         return -1;
 244                 } else {
 245                         fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 246                         explain();
 247                         return -1;
 248                 }
 249                 argc--, argv++;
 250         }
 251
 252         if (metadata && vni_set) {
 253                 fprintf(stderr, "vxlan: both 'external' and vni cannot be specified\n");
 254                 return -1;
 255         }
 256
 257         if (!metadata && !vni_set) {
 258                 fprintf(stderr, "vxlan: missing virtual network identifier\n");
 259                 return -1;
 260         }
 261
 262         if ((gaddr && daddr) ||
 263                 (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
 264                  memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
 265                 fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 266                 return -1;
 267         }
 268
 269         if (!dst_port_set) {
 270                 fprintf(stderr, "vxlan: destination port not specified\n"
 271                         "Will use Linux kernel default (non-standard value)\n");
 272                 fprintf(stderr,
 273                         "Use 'dstport 4789' to get the IANA assigned value\n"
 274                         "Use 'dstport 0' to get default and quiet this message\n");
 275         }
 276
 277         addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 278         if (gaddr)
 279                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 280         else if (daddr)
 281                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 282         if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
 283                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 284         else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
 285                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 286
 287         if (saddr)
 288                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 289         else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
 290                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));
 291
 292         if (link)
 293                 addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 294         addattr32(n, 1024, IFLA_VXLAN_LABEL, label);
 295         addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 296         addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 297         addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 298         addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 299         addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 300         addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 301         addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 302         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_TX, remcsumtx);
 303         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_RX, remcsumrx);
 304         addattr8(n, 1024, IFLA_VXLAN_COLLECT_METADATA, metadata);
 305
 306         if (udpcsum_set)
 307                 addattr8(n, 1024, IFLA_VXLAN_UDP_CSUM, udpcsum);
 308         if (udp6zerocsumtx_set)
 309                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
 310         if (udp6zerocsumrx_set)
 311                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
 312         if (noage)
 313                 addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 314         else if (age)
 315                 addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 316         if (maxaddr)
 317                 addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 318         if (range.low || range.high)
 319                 addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 320                           &range, sizeof(range));
 321         if (dstport)
 322                 addattr16(n, 1024, IFLA_VXLAN_PORT, htons(dstport));
 323
 324         if (gbp)
 325                 addattr_l(n, 1024, IFLA_VXLAN_GBP, NULL, 0);
 326
 327
 328         return 0;
 329 }
 330
 331 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 332 {
 333         __u32 vni;
 334         unsigned int link;
 335         __u8 tos;
 336         __u32 maxaddr;
 337         char s2[64];
 338
 339         if (!tb)
 340                 return;
 341
 342         if (!tb[IFLA_VXLAN_ID] ||
 343             RTA_PAYLOAD(tb[IFLA_VXLAN_ID]) < sizeof(__u32))
 344                 return;
 345
 346         vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 347         fprintf(f, "id %u ", vni);
 348
 349         if (tb[IFLA_VXLAN_GROUP]) {
 350                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 351
 352                 if (addr) {
 353                         if (IN_MULTICAST(ntohl(addr)))
 354                                 fprintf(f, "group %s ",
 355                                         format_host(AF_INET, 4, &addr));
 356                         else
 357                                 fprintf(f, "remote %s ",
 358                                         format_host(AF_INET, 4, &addr));
 359                 }
 360         } else if (tb[IFLA_VXLAN_GROUP6]) {
 361                 struct in6_addr addr;
 362
 363                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 364                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
 365                         if (IN6_IS_ADDR_MULTICAST(&addr))
 366                                 fprintf(f, "group %s ",
 367                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 368                         else
 369                                 fprintf(f, "remote %s ",
 370                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 371                 }
 372         }
 373
 374         if (tb[IFLA_VXLAN_LOCAL]) {
 375                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 376
 377                 if (addr)
 378                         fprintf(f, "local %s ",
 379                                 format_host(AF_INET, 4, &addr));
 380         } else if (tb[IFLA_VXLAN_LOCAL6]) {
 381                 struct in6_addr addr;
 382
 383                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 384                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
 385                         fprintf(f, "local %s ",
 386                                 format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 387         }
 388
 389         if (tb[IFLA_VXLAN_LINK] &&
 390             (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 391                 const char *n = if_indextoname(link, s2);
 392
 393                 if (n)
 394                         fprintf(f, "dev %s ", n);
 395                 else
 396                         fprintf(f, "dev %u ", link);
 397         }
 398
 399         if (tb[IFLA_VXLAN_PORT_RANGE]) {
 400                 const struct ifla_vxlan_port_range *r
 401                         = RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 402                 fprintf(f, "srcport %u %u ", ntohs(r->low), ntohs(r->high));
 403         }
 404
 405         if (tb[IFLA_VXLAN_PORT])
 406                 fprintf(f, "dstport %u ",
 407                         ntohs(rta_getattr_u16(tb[IFLA_VXLAN_PORT])));
 408
 409         if (tb[IFLA_VXLAN_LEARNING] &&
 410             !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 411                 fputs("nolearning ", f);
 412
 413         if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 414                 fputs("proxy ", f);
 415
 416         if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 417                 fputs("rsc ", f);
 418
 419         if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 420                 fputs("l2miss ", f);
 421
 422         if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 423                 fputs("l3miss ", f);
 424
 425         if (tb[IFLA_VXLAN_TOS] &&
 426             (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 427                 if (tos == 1)
 428                         fprintf(f, "tos inherit ");
 429                 else
 430                         fprintf(f, "tos %#x ", tos);
 431         }
 432
 433         if (tb[IFLA_VXLAN_TTL]) {
 434                 __u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 435
 436                 if (ttl)
 437                         fprintf(f, "ttl %d ", ttl);
 438         }
 439
 440         if (tb[IFLA_VXLAN_LABEL]) {
 441                 __u32 label = rta_getattr_u32(tb[IFLA_VXLAN_LABEL]);
 442
 443                 if (label)
 444                         fprintf(f, "flowlabel %#x ", ntohl(label));
 445         }
 446
 447         if (tb[IFLA_VXLAN_AGEING]) {
 448                 __u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 449
 450                 if (age == 0)
 451                         fprintf(f, "ageing none ");
 452                 else
 453                         fprintf(f, "ageing %u ", age);
 454         }
 455
 456         if (tb[IFLA_VXLAN_LIMIT] &&
 457             ((maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT])) != 0))
 458                     fprintf(f, "maxaddr %u ", maxaddr);
 459
 460         if (tb[IFLA_VXLAN_UDP_CSUM]) {
 461                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_CSUM]))
 462                         fputs("no", f);
 463                 fputs("udpcsum ", f);
 464         }
 465
 466         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
 467                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
 468                         fputs("no", f);
 469                 fputs("udp6zerocsumtx ", f);
 470         }
 471
 472         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
 473                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
 474                         fputs("no", f);
 475                 fputs("udp6zerocsumrx ", f);
 476         }
 477
 478         if (tb[IFLA_VXLAN_REMCSUM_TX] &&
 479             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_TX]))
 480                 fputs("remcsumtx ", f);
 481
 482         if (tb[IFLA_VXLAN_REMCSUM_RX] &&
 483             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_RX]))
 484                 fputs("remcsumrx ", f);
 485
 486         if (tb[IFLA_VXLAN_COLLECT_METADATA] &&
 487             rta_getattr_u8(tb[IFLA_VXLAN_COLLECT_METADATA]))
 488                 fputs("external ", f);
 489
 490         if (tb[IFLA_VXLAN_GBP])
 491                 fputs("gbp ", f);
 492 }
 493
 494 static void vxlan_print_help(struct link_util *lu, int argc, char **argv,
 495         FILE *f)
 496 {
 497         print_explain(f);
 498 }
 499
 500 struct link_util vxlan_link_util = {
 501         .id             = "vxlan",
 502         .maxattr        = IFLA_VXLAN_MAX,
 503         .parse_opt      = vxlan_parse_opt,
 504         .print_opt      = vxlan_print_opt,
 505         .print_help     = vxlan_print_help,
 506 };