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, "                 [ ageing SECONDS ] [ maxaddress NUMBER ]\n");
  32         fprintf(stderr, "\n");
  33         fprintf(stderr, "Where: VNI := 0-16777215\n");
  34         fprintf(stderr, "       ADDR := { IP_ADDRESS | any }\n");
  35         fprintf(stderr, "       TOS  := { NUMBER | inherit }\n");
  36         fprintf(stderr, "       TTL  := { 1..255 | inherit }\n");
  37 }
  38
  39 static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
  40                           struct nlmsghdr *n)
  41 {
  42         __u32 vni = 0;
  43         int vni_set = 0;
  44         __u32 saddr = 0;
  45         __u32 gaddr = 0;
  46         __u32 daddr = 0;
  47         struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
  48         struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
  49         struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
  50         unsigned link = 0;
  51         __u8 tos = 0;
  52         __u8 ttl = 0;
  53         __u8 learning = 1;
  54         __u8 proxy = 0;
  55         __u8 rsc = 0;
  56         __u8 l2miss = 0;
  57         __u8 l3miss = 0;
  58         __u8 noage = 0;
  59         __u32 age = 0;
  60         __u32 maxaddr = 0;
  61         __u16 dstport = 0;
  62         int dst_port_set = 0;
  63         struct ifla_vxlan_port_range range = { 0, 0 };
  64
  65         while (argc > 0) {
  66                 if (!matches(*argv, "id") ||
  67                     !matches(*argv, "vni")) {
  68                         NEXT_ARG();
  69                         if (get_u32(&vni, *argv, 0) ||
  70                             vni >= 1u << 24)
  71                                 invarg("invalid id", *argv);
  72                         vni_set = 1;
  73                 } else if (!matches(*argv, "group")) {
  74                         NEXT_ARG();
  75                         if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
  76                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  77                                 return -1;
  78                         }
  79                         if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
  80                                 invarg("invalid group address", *argv);
  81                 } else if (!matches(*argv, "remote")) {
  82                         NEXT_ARG();
  83                         if (!inet_get_addr(*argv, &daddr, &daddr6)) {
  84                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  85                                 return -1;
  86                         }
  87                         if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
  88                                 invarg("invalid remote address", *argv);
  89                 } else if (!matches(*argv, "local")) {
  90                         NEXT_ARG();
  91                         if (strcmp(*argv, "any")) {
  92                                 if (!inet_get_addr(*argv, &saddr, &saddr6)) {
  93                                         fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  94                                         return -1;
  95                                 }
  96                         }
  97
  98                         if (IN_MULTICAST(ntohl(saddr)) || IN6_IS_ADDR_MULTICAST(&saddr6))
  99                                 invarg("invalid local address", *argv);
 100                 } else if (!matches(*argv, "dev")) {
 101                         NEXT_ARG();
 102                         link = if_nametoindex(*argv);
 103                         if (link == 0) {
 104                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 105                                         *argv);
 106                                 exit(-1);
 107                         }
 108                 } else if (!matches(*argv, "ttl") ||
 109                            !matches(*argv, "hoplimit")) {
 110                         unsigned uval;
 111
 112                         NEXT_ARG();
 113                         if (strcmp(*argv, "inherit") != 0) {
 114                                 if (get_unsigned(&uval, *argv, 0))
 115                                         invarg("invalid TTL", *argv);
 116                                 if (uval > 255)
 117                                         invarg("TTL must be <= 255", *argv);
 118                                 ttl = uval;
 119                         }
 120                 } else if (!matches(*argv, "tos") ||
 121                            !matches(*argv, "dsfield")) {
 122                         __u32 uval;
 123
 124                         NEXT_ARG();
 125                         if (strcmp(*argv, "inherit") != 0) {
 126                                 if (rtnl_dsfield_a2n(&uval, *argv))
 127                                         invarg("bad TOS value", *argv);
 128                                 tos = uval;
 129                         } else
 130                                 tos = 1;
 131                 } else if (!matches(*argv, "ageing")) {
 132                         NEXT_ARG();
 133                         if (strcmp(*argv, "none") == 0)
 134                                 noage = 1;
 135                         else if (get_u32(&age, *argv, 0))
 136                                 invarg("ageing timer", *argv);
 137                 } else if (!matches(*argv, "maxaddress")) {
 138                         NEXT_ARG();
 139                         if (strcmp(*argv, "unlimited") == 0)
 140                                 maxaddr = 0;
 141                         else if (get_u32(&maxaddr, *argv, 0))
 142                                 invarg("max addresses", *argv);
 143                 } else if (!matches(*argv, "port") ||
 144                            !matches(*argv, "srcport")) {
 145                         __u16 minport, maxport;
 146                         NEXT_ARG();
 147                         if (get_u16(&minport, *argv, 0))
 148                                 invarg("min port", *argv);
 149                         NEXT_ARG();
 150                         if (get_u16(&maxport, *argv, 0))
 151                                 invarg("max port", *argv);
 152                         range.low = htons(minport);
 153                         range.high = htons(maxport);
 154                 } else if (!matches(*argv, "dstport")){
 155                         NEXT_ARG();
 156                         if (get_u16(&dstport, *argv, 0))
 157                                 invarg("dst port", *argv);
 158                         dst_port_set = 1;
 159                 } else if (!matches(*argv, "nolearning")) {
 160                         learning = 0;
 161                 } else if (!matches(*argv, "learning")) {
 162                         learning = 1;
 163                 } else if (!matches(*argv, "noproxy")) {
 164                         proxy = 0;
 165                 } else if (!matches(*argv, "proxy")) {
 166                         proxy = 1;
 167                 } else if (!matches(*argv, "norsc")) {
 168                         rsc = 0;
 169                 } else if (!matches(*argv, "rsc")) {
 170                         rsc = 1;
 171                 } else if (!matches(*argv, "nol2miss")) {
 172                         l2miss = 0;
 173                 } else if (!matches(*argv, "l2miss")) {
 174                         l2miss = 1;
 175                 } else if (!matches(*argv, "nol3miss")) {
 176                         l3miss = 0;
 177                 } else if (!matches(*argv, "l3miss")) {
 178                         l3miss = 1;
 179                 } else if (matches(*argv, "help") == 0) {
 180                         explain();
 181                         return -1;
 182                 } else {
 183                         fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 184                         explain();
 185                         return -1;
 186                 }
 187                 argc--, argv++;
 188         }
 189
 190         if (!vni_set) {
 191                 fprintf(stderr, "vxlan: missing virtual network identifier\n");
 192                 return -1;
 193         }
 194
 195         if ((gaddr && daddr) ||
 196                 (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
 197                  memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
 198                 fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 199                 return -1;
 200         }
 201
 202         if (!dst_port_set) {
 203                 fprintf(stderr, "vxlan: destination port not specified\n"
 204                         "Will use Linux kernel default (non-standard value)\n");
 205                 fprintf(stderr,
 206                         "Use 'dstport 4789' to get the IANA assigned value\n"
 207                         "Use 'dstport 0' to get default and quiet this message\n");
 208         }
 209
 210         addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 211         if (gaddr)
 212                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 213         else if (daddr)
 214                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 215         if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
 216                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 217         else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
 218                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 219
 220         if (saddr)
 221                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 222         else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
 223                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));
 224
 225         if (link)
 226                 addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 227         addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 228         addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 229         addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 230         addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 231         addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 232         addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 233         addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 234
 235         if (noage)
 236                 addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 237         else if (age)
 238                 addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 239         if (maxaddr)
 240                 addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 241         if (range.low || range.high)
 242                 addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 243                           &range, sizeof(range));
 244         if (dstport)
 245                 addattr16(n, 1024, IFLA_VXLAN_PORT, htons(dstport));
 246
 247         return 0;
 248 }
 249
 250 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 251 {
 252         __u32 vni;
 253         unsigned link;
 254         __u8 tos;
 255         __u32 maxaddr;
 256         char s1[1024];
 257         char s2[64];
 258
 259         if (!tb)
 260                 return;
 261
 262         if (!tb[IFLA_VXLAN_ID] ||
 263             RTA_PAYLOAD(tb[IFLA_VXLAN_ID]) < sizeof(__u32))
 264                 return;
 265
 266         vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 267         fprintf(f, "id %u ", vni);
 268
 269         if (tb[IFLA_VXLAN_GROUP]) {
 270                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 271                 if (addr) {
 272                         if (IN_MULTICAST(ntohl(addr)))
 273                                 fprintf(f, "group %s ",
 274                                         format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 275                         else
 276                                 fprintf(f, "remote %s ",
 277                                         format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 278                 }
 279         } else if (tb[IFLA_VXLAN_GROUP6]) {
 280                 struct in6_addr addr;
 281                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 282                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
 283                         if (IN6_IS_ADDR_MULTICAST(&addr))
 284                                 fprintf(f, "group %s ",
 285                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 286                         else
 287                                 fprintf(f, "remote %s ",
 288                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 289                 }
 290         }
 291
 292         if (tb[IFLA_VXLAN_LOCAL]) {
 293                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 294                 if (addr)
 295                         fprintf(f, "local %s ",
 296                                 format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 297         } else if (tb[IFLA_VXLAN_LOCAL6]) {
 298                 struct in6_addr addr;
 299                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 300                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
 301                         fprintf(f, "local %s ",
 302                                 format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 303         }
 304
 305         if (tb[IFLA_VXLAN_LINK] &&
 306             (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 307                 const char *n = if_indextoname(link, s2);
 308
 309                 if (n)
 310                         fprintf(f, "dev %s ", n);
 311                 else
 312                         fprintf(f, "dev %u ", link);
 313         }
 314
 315         if (tb[IFLA_VXLAN_PORT_RANGE]) {
 316                 const struct ifla_vxlan_port_range *r
 317                         = RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 318                 fprintf(f, "srcport %u %u ", ntohs(r->low), ntohs(r->high));
 319         }
 320
 321         if (tb[IFLA_VXLAN_PORT])
 322                 fprintf(f, "dstport %u ",
 323                         ntohs(rta_getattr_u16(tb[IFLA_VXLAN_PORT])));
 324
 325         if (tb[IFLA_VXLAN_LEARNING] &&
 326             !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 327                 fputs("nolearning ", f);
 328
 329         if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 330                 fputs("proxy ", f);
 331
 332         if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 333                 fputs("rsc ", f);
 334
 335         if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 336                 fputs("l2miss ", f);
 337
 338         if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 339                 fputs("l3miss ", f);
 340
 341         if (tb[IFLA_VXLAN_TOS] &&
 342             (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 343                 if (tos == 1)
 344                         fprintf(f, "tos inherit ");
 345                 else
 346                         fprintf(f, "tos %#x ", tos);
 347         }
 348
 349         if (tb[IFLA_VXLAN_TTL]) {
 350                 __u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 351                 if (ttl)
 352                         fprintf(f, "ttl %d ", ttl);
 353         }
 354
 355         if (tb[IFLA_VXLAN_AGEING]) {
 356                 __u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 357                 if (age == 0)
 358                         fprintf(f, "ageing none ");
 359                 else
 360                         fprintf(f, "ageing %u ", age);
 361         }
 362
 363         if (tb[IFLA_VXLAN_LIMIT] &&
 364             ((maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT])) != 0))
 365                     fprintf(f, "maxaddr %u ", maxaddr);
 366 }
 367
 368 struct link_util vxlan_link_util = {
 369         .id             = "vxlan",
 370         .maxattr        = IFLA_VXLAN_MAX,
 371         .parse_opt      = vxlan_parse_opt,
 372         .print_opt      = vxlan_print_opt,
 373 };