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