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 explain(void)
  25 {
  26         fprintf(stderr, "Usage: ... vxlan id VNI [ { group | remote } ADDR ] [ local ADDR ]\n");
  27         fprintf(stderr, "                 [ ttl TTL ] [ tos TOS ] [ dev PHYS_DEV ]\n");
  28         fprintf(stderr, "                 [ dstport PORT ] [ srcport MIN MAX ]\n");
  29         fprintf(stderr, "                 [ [no]learning ] [ [no]proxy ] [ [no]rsc ]\n");
  30         fprintf(stderr, "                 [ [no]l2miss ] [ [no]l3miss ]\n");
  31         fprintf(stderr, "\n");
  32         fprintf(stderr, "Where: VNI := 0-16777215\n");
  33         fprintf(stderr, "       ADDR := { IP_ADDRESS | any }\n");
  34         fprintf(stderr, "       TOS  := { NUMBER | inherit }\n");
  35         fprintf(stderr, "       TTL  := { 1..255 | inherit }\n");
  36 }
  37
  38 static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
  39                           struct nlmsghdr *n)
  40 {
  41         __u32 vni = 0;
  42         int vni_set = 0;
  43         __u32 saddr = 0;
  44         __u32 gaddr = 0;
  45         __u32 daddr = 0;
  46         struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
  47         struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
  48         struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
  49         unsigned link = 0;
  50         __u8 tos = 0;
  51         __u8 ttl = 0;
  52         __u8 learning = 1;
  53         __u8 proxy = 0;
  54         __u8 rsc = 0;
  55         __u8 l2miss = 0;
  56         __u8 l3miss = 0;
  57         __u8 noage = 0;
  58         __u32 age = 0;
  59         __u32 maxaddr = 0;
  60         __u16 dstport = 0;
  61         int dst_port_set = 0;
  62         struct ifla_vxlan_port_range range = { 0, 0 };
  63
  64         while (argc > 0) {
  65                 if (!matches(*argv, "id") ||
  66                     !matches(*argv, "vni")) {
  67                         NEXT_ARG();
  68                         if (get_u32(&vni, *argv, 0) ||
  69                             vni >= 1u << 24)
  70                                 invarg("invalid id", *argv);
  71                         vni_set = 1;
  72                 } else if (!matches(*argv, "group")) {
  73                         NEXT_ARG();
  74                         if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
  75                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  76                                 return -1;
  77                         }
  78                         if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
  79                                 invarg("invalid group address", *argv);
  80                 } else if (!matches(*argv, "remote")) {
  81                         NEXT_ARG();
  82                         if (!inet_get_addr(*argv, &daddr, &daddr6)) {
  83                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  84                                 return -1;
  85                         }
  86                         if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
  87                                 invarg("invalid remote address", *argv);
  88                 } else if (!matches(*argv, "local")) {
  89                         NEXT_ARG();
  90                         if (strcmp(*argv, "any")) {
  91                                 if (!inet_get_addr(*argv, &saddr, &saddr6)) {
  92                                         fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  93                                         return -1;
  94                                 }
  95                         }
  96
  97                         if (IN_MULTICAST(ntohl(saddr)) || IN6_IS_ADDR_MULTICAST(&saddr6))
  98                                 invarg("invalid local address", *argv);
  99                 } else if (!matches(*argv, "dev")) {
 100                         NEXT_ARG();
 101                         link = if_nametoindex(*argv);
 102                         if (link == 0)
 103                                 exit(-1);
 104                 } else if (!matches(*argv, "ttl") ||
 105                            !matches(*argv, "hoplimit")) {
 106                         unsigned uval;
 107
 108                         NEXT_ARG();
 109                         if (strcmp(*argv, "inherit") != 0) {
 110                                 if (get_unsigned(&uval, *argv, 0))
 111                                         invarg("invalid TTL", *argv);
 112                                 if (uval > 255)
 113                                         invarg("TTL must be <= 255", *argv);
 114                                 ttl = uval;
 115                         }
 116                 } else if (!matches(*argv, "tos") ||
 117                            !matches(*argv, "dsfield")) {
 118                         __u32 uval;
 119
 120                         NEXT_ARG();
 121                         if (strcmp(*argv, "inherit") != 0) {
 122                                 if (rtnl_dsfield_a2n(&uval, *argv))
 123                                         invarg("bad TOS value", *argv);
 124                                 tos = uval;
 125                         } else
 126                                 tos = 1;
 127                 } else if (!matches(*argv, "ageing")) {
 128                         NEXT_ARG();
 129                         if (strcmp(*argv, "none") == 0)
 130                                 noage = 1;
 131                         else if (get_u32(&age, *argv, 0))
 132                                 invarg("ageing timer", *argv);
 133                 } else if (!matches(*argv, "maxaddress")) {
 134                         NEXT_ARG();
 135                         if (strcmp(*argv, "unlimited") == 0)
 136                                 maxaddr = 0;
 137                         else if (get_u32(&maxaddr, *argv, 0))
 138                                 invarg("max addresses", *argv);
 139                 } else if (!matches(*argv, "port") ||
 140                            !matches(*argv, "srcport")) {
 141                         __u16 minport, maxport;
 142                         NEXT_ARG();
 143                         if (get_u16(&minport, *argv, 0))
 144                                 invarg("min port", *argv);
 145                         NEXT_ARG();
 146                         if (get_u16(&maxport, *argv, 0))
 147                                 invarg("max port", *argv);
 148                         range.low = htons(minport);
 149                         range.high = htons(maxport);
 150                 } else if (!matches(*argv, "dstport")){
 151                         NEXT_ARG();
 152                         if (get_u16(&dstport, *argv, 0))
 153                                 invarg("dst port", *argv);
 154                         dst_port_set = 1;
 155                 } else if (!matches(*argv, "nolearning")) {
 156                         learning = 0;
 157                 } else if (!matches(*argv, "learning")) {
 158                         learning = 1;
 159                 } else if (!matches(*argv, "noproxy")) {
 160                         proxy = 0;
 161                 } else if (!matches(*argv, "proxy")) {
 162                         proxy = 1;
 163                 } else if (!matches(*argv, "norsc")) {
 164                         rsc = 0;
 165                 } else if (!matches(*argv, "rsc")) {
 166                         rsc = 1;
 167                 } else if (!matches(*argv, "nol2miss")) {
 168                         l2miss = 0;
 169                 } else if (!matches(*argv, "l2miss")) {
 170                         l2miss = 1;
 171                 } else if (!matches(*argv, "nol3miss")) {
 172                         l3miss = 0;
 173                 } else if (!matches(*argv, "l3miss")) {
 174                         l3miss = 1;
 175                 } else if (matches(*argv, "help") == 0) {
 176                         explain();
 177                         return -1;
 178                 } else {
 179                         fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 180                         explain();
 181                         return -1;
 182                 }
 183                 argc--, argv++;
 184         }
 185
 186         if (!vni_set) {
 187                 fprintf(stderr, "vxlan: missing virtual network identifier\n");
 188                 return -1;
 189         }
 190
 191         if ((gaddr && daddr) ||
 192                 (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
 193                  memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
 194                 fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 195                 return -1;
 196         }
 197
 198         if (!dst_port_set) {
 199                 fprintf(stderr, "vxlan: destination port not specified\n"
 200                         "Will use Linux kernel default (non-standard value)\n");
 201                 fprintf(stderr,
 202                         "Use 'dstport 4789' to get the IANA assigned value\n"
 203                         "Use 'dstport 0' to get default and quiet this message\n");
 204         }
 205
 206         addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 207         if (gaddr)
 208                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 209         else if (daddr)
 210                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 211         if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
 212                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 213         else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
 214                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 215
 216         if (saddr)
 217                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 218         else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
 219                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));
 220
 221         if (link)
 222                 addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 223         addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 224         addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 225         addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 226         addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 227         addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 228         addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 229         addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 230
 231         if (noage)
 232                 addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 233         else if (age)
 234                 addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 235         if (maxaddr)
 236                 addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 237         if (range.low || range.high)
 238                 addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 239                           &range, sizeof(range));
 240         if (dstport)
 241                 addattr16(n, 1024, IFLA_VXLAN_PORT, htons(dstport));
 242
 243         return 0;
 244 }
 245
 246 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 247 {
 248         __u32 vni;
 249         unsigned link;
 250         __u8 tos;
 251         __u32 maxaddr;
 252         char s1[1024];
 253         char s2[64];
 254
 255         if (!tb)
 256                 return;
 257
 258         if (!tb[IFLA_VXLAN_ID] ||
 259             RTA_PAYLOAD(tb[IFLA_VXLAN_ID]) < sizeof(__u32))
 260                 return;
 261
 262         vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 263         fprintf(f, "id %u ", vni);
 264
 265         if (tb[IFLA_VXLAN_GROUP]) {
 266                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 267                 if (addr) {
 268                         if (IN_MULTICAST(ntohl(addr)))
 269                                 fprintf(f, "group %s ",
 270                                         format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 271                         else
 272                                 fprintf(f, "remote %s ",
 273                                         format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 274                 }
 275         } else if (tb[IFLA_VXLAN_GROUP6]) {
 276                 struct in6_addr addr;
 277                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 278                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
 279                         if (IN6_IS_ADDR_MULTICAST(&addr))
 280                                 fprintf(f, "group %s ",
 281                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 282                         else
 283                                 fprintf(f, "remote %s ",
 284                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 285                 }
 286         }
 287
 288         if (tb[IFLA_VXLAN_LOCAL]) {
 289                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 290                 if (addr)
 291                         fprintf(f, "local %s ",
 292                                 format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 293         } else if (tb[IFLA_VXLAN_LOCAL6]) {
 294                 struct in6_addr addr;
 295                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 296                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
 297                         fprintf(f, "local %s ",
 298                                 format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 299         }
 300
 301         if (tb[IFLA_VXLAN_LINK] &&
 302             (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 303                 const char *n = if_indextoname(link, s2);
 304
 305                 if (n)
 306                         fprintf(f, "dev %s ", n);
 307                 else
 308                         fprintf(f, "dev %u ", link);
 309         }
 310
 311         if (tb[IFLA_VXLAN_PORT_RANGE]) {
 312                 const struct ifla_vxlan_port_range *r
 313                         = RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 314                 fprintf(f, "srcport %u %u ", ntohs(r->low), ntohs(r->high));
 315         }
 316
 317         if (tb[IFLA_VXLAN_PORT])
 318                 fprintf(f, "dstport %u ",
 319                         ntohs(rta_getattr_u16(tb[IFLA_VXLAN_PORT])));
 320
 321         if (tb[IFLA_VXLAN_LEARNING] &&
 322             !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 323                 fputs("nolearning ", f);
 324
 325         if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 326                 fputs("proxy ", f);
 327
 328         if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 329                 fputs("rsc ", f);
 330
 331         if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 332                 fputs("l2miss ", f);
 333
 334         if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 335                 fputs("l3miss ", f);
 336
 337         if (tb[IFLA_VXLAN_TOS] &&
 338             (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 339                 if (tos == 1)
 340                         fprintf(f, "tos inherit ");
 341                 else
 342                         fprintf(f, "tos %#x ", tos);
 343         }
 344
 345         if (tb[IFLA_VXLAN_TTL]) {
 346                 __u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 347                 if (ttl)
 348                         fprintf(f, "ttl %d ", ttl);
 349         }
 350
 351         if (tb[IFLA_VXLAN_AGEING]) {
 352                 __u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 353                 if (age == 0)
 354                         fprintf(f, "ageing none ");
 355                 else
 356                         fprintf(f, "ageing %u ", age);
 357         }
 358
 359         if (tb[IFLA_VXLAN_LIMIT] &&
 360             (maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT]) != 0))
 361                     fprintf(f, "maxaddr %u ", maxaddr);
 362 }
 363
 364 struct link_util vxlan_link_util = {
 365         .id             = "vxlan",
 366         .maxattr        = IFLA_VXLAN_MAX,
 367         .parse_opt      = vxlan_parse_opt,
 368         .print_opt      = vxlan_print_opt,
 369 };