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 ] [ 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 }
  41
  42 static void explain(void)
  43 {
  44         print_explain(stderr);
  45 }
  46
  47 static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
  48                           struct nlmsghdr *n)
  49 {
  50         __u32 vni = 0;
  51         int vni_set = 0;
  52         __u32 saddr = 0;
  53         __u32 gaddr = 0;
  54         __u32 daddr = 0;
  55         struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
  56         struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
  57         struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
  58         unsigned int link = 0;
  59         __u8 tos = 0;
  60         __u8 ttl = 0;
  61         __u8 learning = 1;
  62         __u8 proxy = 0;
  63         __u8 rsc = 0;
  64         __u8 l2miss = 0;
  65         __u8 l3miss = 0;
  66         __u8 noage = 0;
  67         __u32 age = 0;
  68         __u32 maxaddr = 0;
  69         __u16 dstport = 0;
  70         __u8 udpcsum = 0;
  71         __u8 udp6zerocsumtx = 0;
  72         __u8 udp6zerocsumrx = 0;
  73         __u8 remcsumtx = 0;
  74         __u8 remcsumrx = 0;
  75         __u8 metadata = 0;
  76         __u8 gbp = 0;
  77         int dst_port_set = 0;
  78         struct ifla_vxlan_port_range range = { 0, 0 };
  79
  80         while (argc > 0) {
  81                 if (!matches(*argv, "id") ||
  82                     !matches(*argv, "vni")) {
  83                         NEXT_ARG();
  84                         if (get_u32(&vni, *argv, 0) ||
  85                             vni >= 1u << 24)
  86                                 invarg("invalid id", *argv);
  87                         vni_set = 1;
  88                 } else if (!matches(*argv, "group")) {
  89                         NEXT_ARG();
  90                         if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
  91                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  92                                 return -1;
  93                         }
  94                         if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
  95                                 invarg("invalid group address", *argv);
  96                 } else if (!matches(*argv, "remote")) {
  97                         NEXT_ARG();
  98                         if (!inet_get_addr(*argv, &daddr, &daddr6)) {
  99                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 100                                 return -1;
 101                         }
 102                         if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
 103                                 invarg("invalid remote address", *argv);
 104                 } else if (!matches(*argv, "local")) {
 105                         NEXT_ARG();
 106                         if (strcmp(*argv, "any")) {
 107                                 if (!inet_get_addr(*argv, &saddr, &saddr6)) {
 108                                         fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 109                                         return -1;
 110                                 }
 111                         }
 112
 113                         if (IN_MULTICAST(ntohl(saddr)) || IN6_IS_ADDR_MULTICAST(&saddr6))
 114                                 invarg("invalid local address", *argv);
 115                 } else if (!matches(*argv, "dev")) {
 116                         NEXT_ARG();
 117                         link = if_nametoindex(*argv);
 118                         if (link == 0) {
 119                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 120                                         *argv);
 121                                 exit(-1);
 122                         }
 123                 } else if (!matches(*argv, "ttl") ||
 124                            !matches(*argv, "hoplimit")) {
 125                         unsigned int uval;
 126
 127                         NEXT_ARG();
 128                         if (strcmp(*argv, "inherit") != 0) {
 129                                 if (get_unsigned(&uval, *argv, 0))
 130                                         invarg("invalid TTL", *argv);
 131                                 if (uval > 255)
 132                                         invarg("TTL must be <= 255", *argv);
 133                                 ttl = uval;
 134                         }
 135                 } else if (!matches(*argv, "tos") ||
 136                            !matches(*argv, "dsfield")) {
 137                         __u32 uval;
 138
 139                         NEXT_ARG();
 140                         if (strcmp(*argv, "inherit") != 0) {
 141                                 if (rtnl_dsfield_a2n(&uval, *argv))
 142                                         invarg("bad TOS value", *argv);
 143                                 tos = uval;
 144                         } else
 145                                 tos = 1;
 146                 } else if (!matches(*argv, "ageing")) {
 147                         NEXT_ARG();
 148                         if (strcmp(*argv, "none") == 0)
 149                                 noage = 1;
 150                         else if (get_u32(&age, *argv, 0))
 151                                 invarg("ageing timer", *argv);
 152                 } else if (!matches(*argv, "maxaddress")) {
 153                         NEXT_ARG();
 154                         if (strcmp(*argv, "unlimited") == 0)
 155                                 maxaddr = 0;
 156                         else if (get_u32(&maxaddr, *argv, 0))
 157                                 invarg("max addresses", *argv);
 158                 } else if (!matches(*argv, "port") ||
 159                            !matches(*argv, "srcport")) {
 160                         __u16 minport, maxport;
 161
 162                         NEXT_ARG();
 163                         if (get_u16(&minport, *argv, 0))
 164                                 invarg("min port", *argv);
 165                         NEXT_ARG();
 166                         if (get_u16(&maxport, *argv, 0))
 167                                 invarg("max port", *argv);
 168                         range.low = htons(minport);
 169                         range.high = htons(maxport);
 170                 } else if (!matches(*argv, "dstport")) {
 171                         NEXT_ARG();
 172                         if (get_u16(&dstport, *argv, 0))
 173                                 invarg("dst port", *argv);
 174                         dst_port_set = 1;
 175                 } else if (!matches(*argv, "nolearning")) {
 176                         learning = 0;
 177                 } else if (!matches(*argv, "learning")) {
 178                         learning = 1;
 179                 } else if (!matches(*argv, "noproxy")) {
 180                         proxy = 0;
 181                 } else if (!matches(*argv, "proxy")) {
 182                         proxy = 1;
 183                 } else if (!matches(*argv, "norsc")) {
 184                         rsc = 0;
 185                 } else if (!matches(*argv, "rsc")) {
 186                         rsc = 1;
 187                 } else if (!matches(*argv, "nol2miss")) {
 188                         l2miss = 0;
 189                 } else if (!matches(*argv, "l2miss")) {
 190                         l2miss = 1;
 191                 } else if (!matches(*argv, "nol3miss")) {
 192                         l3miss = 0;
 193                 } else if (!matches(*argv, "l3miss")) {
 194                         l3miss = 1;
 195                 } else if (!matches(*argv, "udpcsum")) {
 196                         udpcsum = 1;
 197                 } else if (!matches(*argv, "noudpcsum")) {
 198                         udpcsum = 0;
 199                 } else if (!matches(*argv, "udp6zerocsumtx")) {
 200                         udp6zerocsumtx = 1;
 201                 } else if (!matches(*argv, "noudp6zerocsumtx")) {
 202                         udp6zerocsumtx = 0;
 203                 } else if (!matches(*argv, "udp6zerocsumrx")) {
 204                         udp6zerocsumrx = 1;
 205                 } else if (!matches(*argv, "noudp6zerocsumrx")) {
 206                         udp6zerocsumrx = 0;
 207                 } else if (!matches(*argv, "remcsumtx")) {
 208                         remcsumtx = 1;
 209                 } else if (!matches(*argv, "noremcsumtx")) {
 210                         remcsumtx = 0;
 211                 } else if (!matches(*argv, "remcsumrx")) {
 212                         remcsumrx = 1;
 213                 } else if (!matches(*argv, "noremcsumrx")) {
 214                         remcsumrx = 0;
 215                 } else if (!matches(*argv, "external")) {
 216                         metadata = 1;
 217                 } else if (!matches(*argv, "noexternal")) {
 218                         metadata = 0;
 219                 } else if (!matches(*argv, "gbp")) {
 220                         gbp = 1;
 221                 } else if (matches(*argv, "help") == 0) {
 222                         explain();
 223                         return -1;
 224                 } else {
 225                         fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 226                         explain();
 227                         return -1;
 228                 }
 229                 argc--, argv++;
 230         }
 231
 232         if (metadata && vni_set) {
 233                 fprintf(stderr, "vxlan: both 'external' and vni cannot be specified\n");
 234                 return -1;
 235         }
 236
 237         if (!metadata && !vni_set) {
 238                 fprintf(stderr, "vxlan: missing virtual network identifier\n");
 239                 return -1;
 240         }
 241
 242         if ((gaddr && daddr) ||
 243                 (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
 244                  memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
 245                 fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 246                 return -1;
 247         }
 248
 249         if (!dst_port_set) {
 250                 fprintf(stderr, "vxlan: destination port not specified\n"
 251                         "Will use Linux kernel default (non-standard value)\n");
 252                 fprintf(stderr,
 253                         "Use 'dstport 4789' to get the IANA assigned value\n"
 254                         "Use 'dstport 0' to get default and quiet this message\n");
 255         }
 256
 257         addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 258         if (gaddr)
 259                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 260         else if (daddr)
 261                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 262         if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
 263                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 264         else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
 265                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 266
 267         if (saddr)
 268                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 269         else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
 270                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));
 271
 272         if (link)
 273                 addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 274         addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 275         addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 276         addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 277         addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 278         addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 279         addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 280         addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 281         addattr8(n, 1024, IFLA_VXLAN_UDP_CSUM, udpcsum);
 282         addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
 283         addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
 284         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_TX, remcsumtx);
 285         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_RX, remcsumrx);
 286         addattr8(n, 1024, IFLA_VXLAN_COLLECT_METADATA, metadata);
 287
 288         if (noage)
 289                 addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 290         else if (age)
 291                 addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 292         if (maxaddr)
 293                 addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 294         if (range.low || range.high)
 295                 addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 296                           &range, sizeof(range));
 297         if (dstport)
 298                 addattr16(n, 1024, IFLA_VXLAN_PORT, htons(dstport));
 299
 300         if (gbp)
 301                 addattr_l(n, 1024, IFLA_VXLAN_GBP, NULL, 0);
 302
 303
 304         return 0;
 305 }
 306
 307 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 308 {
 309         __u32 vni;
 310         unsigned int link;
 311         __u8 tos;
 312         __u32 maxaddr;
 313         char s1[1024];
 314         char s2[64];
 315
 316         if (!tb)
 317                 return;
 318
 319         if (!tb[IFLA_VXLAN_ID] ||
 320             RTA_PAYLOAD(tb[IFLA_VXLAN_ID]) < sizeof(__u32))
 321                 return;
 322
 323         vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 324         fprintf(f, "id %u ", vni);
 325
 326         if (tb[IFLA_VXLAN_GROUP]) {
 327                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 328
 329                 if (addr) {
 330                         if (IN_MULTICAST(ntohl(addr)))
 331                                 fprintf(f, "group %s ",
 332                                         format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 333                         else
 334                                 fprintf(f, "remote %s ",
 335                                         format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 336                 }
 337         } else if (tb[IFLA_VXLAN_GROUP6]) {
 338                 struct in6_addr addr;
 339
 340                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 341                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
 342                         if (IN6_IS_ADDR_MULTICAST(&addr))
 343                                 fprintf(f, "group %s ",
 344                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 345                         else
 346                                 fprintf(f, "remote %s ",
 347                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 348                 }
 349         }
 350
 351         if (tb[IFLA_VXLAN_LOCAL]) {
 352                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 353
 354                 if (addr)
 355                         fprintf(f, "local %s ",
 356                                 format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 357         } else if (tb[IFLA_VXLAN_LOCAL6]) {
 358                 struct in6_addr addr;
 359
 360                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 361                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
 362                         fprintf(f, "local %s ",
 363                                 format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 364         }
 365
 366         if (tb[IFLA_VXLAN_LINK] &&
 367             (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 368                 const char *n = if_indextoname(link, s2);
 369
 370                 if (n)
 371                         fprintf(f, "dev %s ", n);
 372                 else
 373                         fprintf(f, "dev %u ", link);
 374         }
 375
 376         if (tb[IFLA_VXLAN_PORT_RANGE]) {
 377                 const struct ifla_vxlan_port_range *r
 378                         = RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 379                 fprintf(f, "srcport %u %u ", ntohs(r->low), ntohs(r->high));
 380         }
 381
 382         if (tb[IFLA_VXLAN_PORT])
 383                 fprintf(f, "dstport %u ",
 384                         ntohs(rta_getattr_u16(tb[IFLA_VXLAN_PORT])));
 385
 386         if (tb[IFLA_VXLAN_LEARNING] &&
 387             !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 388                 fputs("nolearning ", f);
 389
 390         if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 391                 fputs("proxy ", f);
 392
 393         if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 394                 fputs("rsc ", f);
 395
 396         if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 397                 fputs("l2miss ", f);
 398
 399         if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 400                 fputs("l3miss ", f);
 401
 402         if (tb[IFLA_VXLAN_TOS] &&
 403             (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 404                 if (tos == 1)
 405                         fprintf(f, "tos inherit ");
 406                 else
 407                         fprintf(f, "tos %#x ", tos);
 408         }
 409
 410         if (tb[IFLA_VXLAN_TTL]) {
 411                 __u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 412
 413                 if (ttl)
 414                         fprintf(f, "ttl %d ", ttl);
 415         }
 416
 417         if (tb[IFLA_VXLAN_AGEING]) {
 418                 __u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 419
 420                 if (age == 0)
 421                         fprintf(f, "ageing none ");
 422                 else
 423                         fprintf(f, "ageing %u ", age);
 424         }
 425
 426         if (tb[IFLA_VXLAN_LIMIT] &&
 427             ((maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT])) != 0))
 428                     fprintf(f, "maxaddr %u ", maxaddr);
 429
 430         if (tb[IFLA_VXLAN_UDP_CSUM] && rta_getattr_u8(tb[IFLA_VXLAN_UDP_CSUM]))
 431                 fputs("udpcsum ", f);
 432
 433         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
 434             rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
 435                 fputs("udp6zerocsumtx ", f);
 436
 437         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
 438             rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
 439                 fputs("udp6zerocsumrx ", f);
 440
 441         if (tb[IFLA_VXLAN_REMCSUM_TX] &&
 442             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_TX]))
 443                 fputs("remcsumtx ", f);
 444
 445         if (tb[IFLA_VXLAN_REMCSUM_RX] &&
 446             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_RX]))
 447                 fputs("remcsumrx ", f);
 448
 449         if (tb[IFLA_VXLAN_COLLECT_METADATA] &&
 450             rta_getattr_u8(tb[IFLA_VXLAN_COLLECT_METADATA]))
 451                 fputs("external ", f);
 452
 453         if (tb[IFLA_VXLAN_GBP])
 454                 fputs("gbp ", f);
 455 }
 456
 457 static void vxlan_print_help(struct link_util *lu, int argc, char **argv,
 458         FILE *f)
 459 {
 460         print_explain(f);
 461 }
 462
 463 struct link_util vxlan_link_util = {
 464         .id             = "vxlan",
 465         .maxattr        = IFLA_VXLAN_MAX,
 466         .parse_opt      = vxlan_parse_opt,
 467         .print_opt      = vxlan_print_opt,
 468         .print_help     = vxlan_print_help,
 469 };