target/linux/generic/patches-3.18/666-Add-support-for-MAP-E-FMRs-mesh-mode.patch

   1 From 775d6fe74d1eaec2ba387535b068dde2dc89de9e Mon Sep 17 00:00:00 2001
   2 From: Steven Barth <steven@midlink.org>
   3 Date: Thu, 22 May 2014 09:49:05 +0200
   4 Subject: [PATCH] Add support for MAP-E FMRs (mesh mode)
   5
   6 MAP-E FMRs (draft-ietf-softwire-map-10) are rules for IPv4-communication
   7 between MAP CEs (mesh mode) without the need to forward such data to a
   8 border relay. This is similar to how 6rd works but for IPv4 over IPv6.
   9
  10 Signed-off-by: Steven Barth <cyrus@openwrt.org>
  11 ---
  12  include/net/ip6_tunnel.h       |  13 ++
  13  include/uapi/linux/if_tunnel.h |  13 ++
  14  net/ipv6/ip6_tunnel.c          | 276 +++++++++++++++++++++++++++++++++++++++--
  15  3 files changed, 291 insertions(+), 11 deletions(-)
  16
  17 --- a/include/net/ip6_tunnel.h
  18 +++ b/include/net/ip6_tunnel.h
  19 @@ -15,6 +15,18 @@
  20  /* determine capability on a per-packet basis */
  21  #define IP6_TNL_F_CAP_PER_PACKET 0x40000
  22
  23 +/* IPv6 tunnel FMR */
  24 +struct __ip6_tnl_fmr {
  25 +       struct __ip6_tnl_fmr *next; /* next fmr in list */
  26 +       struct in6_addr ip6_prefix;
  27 +       struct in_addr ip4_prefix;
  28 +
  29 +       __u8 ip6_prefix_len;
  30 +       __u8 ip4_prefix_len;
  31 +       __u8 ea_len;
  32 +       __u8 offset;
  33 +};
  34 +
  35  struct __ip6_tnl_parm {
  36         char name[IFNAMSIZ];    /* name of tunnel device */
  37         int link;               /* ifindex of underlying L2 interface */
  38 @@ -25,6 +37,7 @@ struct __ip6_tnl_parm {
  39         __u32 flags;            /* tunnel flags */
  40         struct in6_addr laddr;  /* local tunnel end-point address */
  41         struct in6_addr raddr;  /* remote tunnel end-point address */
  42 +       struct __ip6_tnl_fmr *fmrs;     /* FMRs */
  43
  44         __be16                  i_flags;
  45         __be16                  o_flags;
  46 --- a/net/ipv6/ip6_tunnel.c
  47 +++ b/net/ipv6/ip6_tunnel.c
  48 @@ -16,6 +16,8 @@
  49   *      as published by the Free Software Foundation; either version
  50   *      2 of the License, or (at your option) any later version.
  51   *
  52 + *     Changes:
  53 + * Steven Barth <cyrus@openwrt.org>:           MAP-E FMR support
  54   */
  55
  56  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  57 @@ -77,11 +79,9 @@ static bool log_ecn_error = true;
  58  module_param(log_ecn_error, bool, 0644);
  59  MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  60
  61 -static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
  62 +static u32 HASH(const struct in6_addr *addr)
  63  {
  64 -       u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
  65 -
  66 -       return hash_32(hash, HASH_SIZE_SHIFT);
  67 +       return hash_32(ipv6_addr_hash(addr), HASH_SIZE_SHIFT);
  68  }
  69
  70  static int ip6_tnl_dev_init(struct net_device *dev);
  71 @@ -180,15 +180,24 @@ EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
  72  static struct ip6_tnl *
  73  ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
  74  {
  75 -       unsigned int hash = HASH(remote, local);
  76 +       unsigned int hash = HASH(local);
  77         struct ip6_tnl *t;
  78         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
  79 +       struct __ip6_tnl_fmr *fmr;
  80
  81         for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
  82 -               if (ipv6_addr_equal(local, &t->parms.laddr) &&
  83 -                   ipv6_addr_equal(remote, &t->parms.raddr) &&
  84 -                   (t->dev->flags & IFF_UP))
  85 +               if (!ipv6_addr_equal(local, &t->parms.laddr) ||
  86 +                               !(t->dev->flags & IFF_UP))
  87 +                       continue;
  88 +
  89 +               if (ipv6_addr_equal(remote, &t->parms.raddr))
  90                         return t;
  91 +
  92 +               for (fmr = t->parms.fmrs; fmr; fmr = fmr->next) {
  93 +                       if (ipv6_prefix_equal(remote, &fmr->ip6_prefix,
  94 +                                       fmr->ip6_prefix_len))
  95 +                               return t;
  96 +               }
  97         }
  98         t = rcu_dereference(ip6n->tnls_wc[0]);
  99         if (t && (t->dev->flags & IFF_UP))
 100 @@ -218,7 +227,7 @@ ip6_tnl_bucket(struct ip6_tnl_net *ip6n,
 101
 102         if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
 103                 prio = 1;
 104 -               h = HASH(remote, local);
 105 +               h = HASH(local);
 106         }
 107         return &ip6n->tnls[prio][h];
 108  }
 109 @@ -391,6 +400,12 @@ ip6_tnl_dev_uninit(struct net_device *de
 110         struct net *net = t->net;
 111         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
 112
 113 +       while (t->parms.fmrs) {
 114 +               struct __ip6_tnl_fmr *next = t->parms.fmrs->next;
 115 +               kfree(t->parms.fmrs);
 116 +               t->parms.fmrs = next;
 117 +       }
 118 +
 119         if (dev == ip6n->fb_tnl_dev)
 120                 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
 121         else
 122 @@ -774,6 +789,108 @@ int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
 123  }
 124  EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
 125
 126 +
 127 +/**
 128 + * ip4ip6_fmr_calc - calculate target / source IPv6-address based on FMR
 129 + *   @dest: destination IPv6 address buffer
 130 + *   @skb: received socket buffer
 131 + *   @fmr: MAP FMR
 132 + *   @xmit: Calculate for xmit or rcv
 133 + **/
 134 +static void ip4ip6_fmr_calc(struct in6_addr *dest,
 135 +               const struct iphdr *iph, const uint8_t *end,
 136 +               const struct __ip6_tnl_fmr *fmr, bool xmit)
 137 +{
 138 +       int psidlen = fmr->ea_len - (32 - fmr->ip4_prefix_len);
 139 +       u8 *portp = NULL;
 140 +       bool use_dest_addr;
 141 +       const struct iphdr *dsth = iph;
 142 +
 143 +       if ((u8*)dsth >= end)
 144 +               return;
 145 +
 146 +       /* find significant IP header */
 147 +       if (iph->protocol == IPPROTO_ICMP) {
 148 +               struct icmphdr *ih = (struct icmphdr*)(((u8*)dsth) + dsth->ihl * 4);
 149 +               if (ih && ((u8*)&ih[1]) <= end && (
 150 +                       ih->type == ICMP_DEST_UNREACH ||
 151 +                       ih->type == ICMP_SOURCE_QUENCH ||
 152 +                       ih->type == ICMP_TIME_EXCEEDED ||
 153 +                       ih->type == ICMP_PARAMETERPROB ||
 154 +                       ih->type == ICMP_REDIRECT))
 155 +                               dsth = (const struct iphdr*)&ih[1];
 156 +       }
 157 +
 158 +       /* in xmit-path use dest port by default and source port only if
 159 +               this is an ICMP reply to something else; vice versa in rcv-path */
 160 +       use_dest_addr = (xmit && dsth == iph) || (!xmit && dsth != iph);
 161 +
 162 +       /* get dst port */
 163 +       if (((u8*)&dsth[1]) <= end && (
 164 +               dsth->protocol == IPPROTO_UDP ||
 165 +               dsth->protocol == IPPROTO_TCP ||
 166 +               dsth->protocol == IPPROTO_SCTP ||
 167 +               dsth->protocol == IPPROTO_DCCP)) {
 168 +                       /* for UDP, TCP, SCTP and DCCP source and dest port
 169 +                       follow IPv4 header directly */
 170 +                       portp = ((u8*)dsth) + dsth->ihl * 4;
 171 +
 172 +                       if (use_dest_addr)
 173 +                               portp += sizeof(u16);
 174 +       } else if (iph->protocol == IPPROTO_ICMP) {
 175 +               struct icmphdr *ih = (struct icmphdr*)(((u8*)dsth) + dsth->ihl * 4);
 176 +
 177 +               /* use icmp identifier as port */
 178 +               if (((u8*)&ih) <= end && (
 179 +                   (use_dest_addr && (
 180 +                   ih->type == ICMP_ECHOREPLY ||
 181 +                       ih->type == ICMP_TIMESTAMPREPLY ||
 182 +                       ih->type == ICMP_INFO_REPLY ||
 183 +                       ih->type == ICMP_ADDRESSREPLY)) ||
 184 +                       (!use_dest_addr && (
 185 +                       ih->type == ICMP_ECHO ||
 186 +                       ih->type == ICMP_TIMESTAMP ||
 187 +                       ih->type == ICMP_INFO_REQUEST ||
 188 +                       ih->type == ICMP_ADDRESS)
 189 +                       )))
 190 +                               portp = (u8*)&ih->un.echo.id;
 191 +       }
 192 +
 193 +       if ((portp && &portp[2] <= end) || psidlen == 0) {
 194 +               int frombyte = fmr->ip6_prefix_len / 8;
 195 +               int fromrem = fmr->ip6_prefix_len % 8;
 196 +               int bytes = sizeof(struct in6_addr) - frombyte;
 197 +               const u32 *addr = (use_dest_addr) ? &iph->daddr : &iph->saddr;
 198 +               u64 eabits = ((u64)ntohl(*addr)) << (32 + fmr->ip4_prefix_len);
 199 +               u64 t = 0;
 200 +
 201 +               /* extract PSID from port and add it to eabits */
 202 +               u16 psidbits = 0;
 203 +               if (psidlen > 0) {
 204 +                       psidbits = ((u16)portp[0]) << 8 | ((u16)portp[1]);
 205 +                       psidbits >>= 16 - psidlen - fmr->offset;
 206 +                       psidbits = (u16)(psidbits << (16 - psidlen));
 207 +                       eabits |= ((u64)psidbits) << (48 - (fmr->ea_len - psidlen));
 208 +               }
 209 +
 210 +               /* rewrite destination address */
 211 +               *dest = fmr->ip6_prefix;
 212 +               memcpy(&dest->s6_addr[10], addr, sizeof(*addr));
 213 +               dest->s6_addr16[7] = htons(psidbits >> (16 - psidlen));
 214 +
 215 +               if (bytes > sizeof(u64))
 216 +                       bytes = sizeof(u64);
 217 +
 218 +               /* insert eabits */
 219 +               memcpy(&t, &dest->s6_addr[frombyte], bytes);
 220 +               t = be64_to_cpu(t) & ~(((((u64)1) << fmr->ea_len) - 1)
 221 +                       << (64 - fmr->ea_len - fromrem));
 222 +               t = cpu_to_be64(t | (eabits >> fromrem));
 223 +               memcpy(&dest->s6_addr[frombyte], &t, bytes);
 224 +       }
 225 +}
 226 +
 227 +
 228  /**
 229   * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
 230   *   @skb: received socket buffer
 231 @@ -818,6 +935,26 @@ static int ip6_tnl_rcv(struct sk_buff *s
 232                 skb_reset_network_header(skb);
 233                 skb->protocol = htons(protocol);
 234                 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
 235 +               if (protocol == ETH_P_IP &&
 236 +                       !ipv6_addr_equal(&ipv6h->saddr, &t->parms.raddr)) {
 237 +                               /* Packet didn't come from BR, so lookup FMR */
 238 +                               struct __ip6_tnl_fmr *fmr;
 239 +                               struct in6_addr expected = t->parms.raddr;
 240 +                               for (fmr = t->parms.fmrs; fmr; fmr = fmr->next)
 241 +                                       if (ipv6_prefix_equal(&ipv6h->saddr,
 242 +                                               &fmr->ip6_prefix, fmr->ip6_prefix_len))
 243 +                                                       break;
 244 +
 245 +                               /* Check that IPv6 matches IPv4 source to prevent spoofing */
 246 +                               if (fmr)
 247 +                                       ip4ip6_fmr_calc(&expected, ip_hdr(skb),
 248 +                                                       skb_tail_pointer(skb), fmr, false);
 249 +
 250 +                               if (!ipv6_addr_equal(&ipv6h->saddr, &expected)) {
 251 +                                       rcu_read_unlock();
 252 +                                       goto discard;
 253 +                               }
 254 +               }
 255
 256                 __skb_tunnel_rx(skb, t->dev, t->net);
 257
 258 @@ -1079,6 +1216,7 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, str
 259         __u8 dsfield;
 260         __u32 mtu;
 261         int err;
 262 +       struct __ip6_tnl_fmr *fmr;
 263
 264         if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
 265             !ip6_tnl_xmit_ctl(t))
 266 @@ -1098,6 +1236,18 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, str
 267         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 268                 fl6.flowi6_mark = skb->mark;
 269
 270 +       /* try to find matching FMR */
 271 +       for (fmr = t->parms.fmrs; fmr; fmr = fmr->next) {
 272 +               unsigned mshift = 32 - fmr->ip4_prefix_len;
 273 +               if (ntohl(fmr->ip4_prefix.s_addr) >> mshift ==
 274 +                               ntohl(iph->daddr) >> mshift)
 275 +                       break;
 276 +       }
 277 +
 278 +       /* change dstaddr according to FMR */
 279 +       if (fmr)
 280 +               ip4ip6_fmr_calc(&fl6.daddr, iph, skb_tail_pointer(skb), fmr, true);
 281 +
 282         err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
 283         if (err != 0) {
 284                 /* XXX: send ICMP error even if DF is not set. */
 285 @@ -1266,6 +1416,14 @@ ip6_tnl_change(struct ip6_tnl *t, const
 286         t->parms.flowinfo = p->flowinfo;
 287         t->parms.link = p->link;
 288         t->parms.proto = p->proto;
 289 +
 290 +       while (t->parms.fmrs) {
 291 +               struct __ip6_tnl_fmr *next = t->parms.fmrs->next;
 292 +               kfree(t->parms.fmrs);
 293 +               t->parms.fmrs = next;
 294 +       }
 295 +       t->parms.fmrs = p->fmrs;
 296 +
 297         ip6_tnl_dst_reset(t);
 298         ip6_tnl_link_config(t);
 299         return 0;
 300 @@ -1296,6 +1454,7 @@ ip6_tnl_parm_from_user(struct __ip6_tnl_
 301         p->flowinfo = u->flowinfo;
 302         p->link = u->link;
 303         p->proto = u->proto;
 304 +       p->fmrs = NULL;
 305         memcpy(p->name, u->name, sizeof(u->name));
 306  }
 307
 308 @@ -1576,6 +1735,15 @@ static int ip6_tnl_validate(struct nlatt
 309         return 0;
 310  }
 311
 312 +static const struct nla_policy ip6_tnl_fmr_policy[IFLA_IPTUN_FMR_MAX + 1] = {
 313 +       [IFLA_IPTUN_FMR_IP6_PREFIX] = { .len = sizeof(struct in6_addr) },
 314 +       [IFLA_IPTUN_FMR_IP4_PREFIX] = { .len = sizeof(struct in_addr) },
 315 +       [IFLA_IPTUN_FMR_IP6_PREFIX_LEN] = { .type = NLA_U8 },
 316 +       [IFLA_IPTUN_FMR_IP4_PREFIX_LEN] = { .type = NLA_U8 },
 317 +       [IFLA_IPTUN_FMR_EA_LEN] = { .type = NLA_U8 },
 318 +       [IFLA_IPTUN_FMR_OFFSET] = { .type = NLA_U8 }
 319 +};
 320 +
 321  static void ip6_tnl_netlink_parms(struct nlattr *data[],
 322                                   struct __ip6_tnl_parm *parms)
 323  {
 324 @@ -1609,6 +1777,46 @@ static void ip6_tnl_netlink_parms(struct
 325
 326         if (data[IFLA_IPTUN_PROTO])
 327                 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
 328 +
 329 +       if (data[IFLA_IPTUN_FMRS]) {
 330 +               unsigned rem;
 331 +               struct nlattr *fmr;
 332 +               nla_for_each_nested(fmr, data[IFLA_IPTUN_FMRS], rem) {
 333 +                       struct nlattr *fmrd[IFLA_IPTUN_FMR_MAX + 1], *c;
 334 +                       struct __ip6_tnl_fmr *nfmr;
 335 +
 336 +                       nla_parse_nested(fmrd, IFLA_IPTUN_FMR_MAX,
 337 +                               fmr, ip6_tnl_fmr_policy);
 338 +
 339 +                       if (!(nfmr = kzalloc(sizeof(*nfmr), GFP_KERNEL)))
 340 +                               continue;
 341 +
 342 +                       nfmr->offset = 6;
 343 +
 344 +                       if ((c = fmrd[IFLA_IPTUN_FMR_IP6_PREFIX]))
 345 +                               nla_memcpy(&nfmr->ip6_prefix, fmrd[IFLA_IPTUN_FMR_IP6_PREFIX],
 346 +                                       sizeof(nfmr->ip6_prefix));
 347 +
 348 +                       if ((c = fmrd[IFLA_IPTUN_FMR_IP4_PREFIX]))
 349 +                               nla_memcpy(&nfmr->ip4_prefix, fmrd[IFLA_IPTUN_FMR_IP4_PREFIX],
 350 +                                       sizeof(nfmr->ip4_prefix));
 351 +
 352 +                       if ((c = fmrd[IFLA_IPTUN_FMR_IP6_PREFIX_LEN]))
 353 +                               nfmr->ip6_prefix_len = nla_get_u8(c);
 354 +
 355 +                       if ((c = fmrd[IFLA_IPTUN_FMR_IP4_PREFIX_LEN]))
 356 +                               nfmr->ip4_prefix_len = nla_get_u8(c);
 357 +
 358 +                       if ((c = fmrd[IFLA_IPTUN_FMR_EA_LEN]))
 359 +                               nfmr->ea_len = nla_get_u8(c);
 360 +
 361 +                       if ((c = fmrd[IFLA_IPTUN_FMR_OFFSET]))
 362 +                               nfmr->offset = nla_get_u8(c);
 363 +
 364 +                       nfmr->next = parms->fmrs;
 365 +                       parms->fmrs = nfmr;
 366 +               }
 367 +       }
 368  }
 369
 370  static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
 371 @@ -1661,6 +1869,12 @@ static void ip6_tnl_dellink(struct net_d
 372
 373  static size_t ip6_tnl_get_size(const struct net_device *dev)
 374  {
 375 +       const struct ip6_tnl *t = netdev_priv(dev);
 376 +       struct __ip6_tnl_fmr *c;
 377 +       int fmrs = 0;
 378 +       for (c = t->parms.fmrs; c; c = c->next)
 379 +               ++fmrs;
 380 +
 381         return
 382                 /* IFLA_IPTUN_LINK */
 383                 nla_total_size(4) +
 384 @@ -1678,6 +1892,24 @@ static size_t ip6_tnl_get_size(const str
 385                 nla_total_size(4) +
 386                 /* IFLA_IPTUN_PROTO */
 387                 nla_total_size(1) +
 388 +               /* IFLA_IPTUN_FMRS */
 389 +               nla_total_size(0) +
 390 +               (
 391 +                       /* nest */
 392 +                       nla_total_size(0) +
 393 +                       /* IFLA_IPTUN_FMR_IP6_PREFIX */
 394 +                       nla_total_size(sizeof(struct in6_addr)) +
 395 +                       /* IFLA_IPTUN_FMR_IP4_PREFIX */
 396 +                       nla_total_size(sizeof(struct in_addr)) +
 397 +                       /* IFLA_IPTUN_FMR_EA_LEN */
 398 +                       nla_total_size(1) +
 399 +                       /* IFLA_IPTUN_FMR_IP6_PREFIX_LEN */
 400 +                       nla_total_size(1) +
 401 +                       /* IFLA_IPTUN_FMR_IP4_PREFIX_LEN */
 402 +                       nla_total_size(1) +
 403 +                       /* IFLA_IPTUN_FMR_OFFSET */
 404 +                       nla_total_size(1)
 405 +               ) * fmrs +
 406                 0;
 407  }
 408
 409 @@ -1685,6 +1917,9 @@ static int ip6_tnl_fill_info(struct sk_b
 410  {
 411         struct ip6_tnl *tunnel = netdev_priv(dev);
 412         struct __ip6_tnl_parm *parm = &tunnel->parms;
 413 +       struct __ip6_tnl_fmr *c;
 414 +       int fmrcnt = 0;
 415 +       struct nlattr *fmrs;
 416
 417         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
 418             nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
 419 @@ -1695,8 +1930,27 @@ static int ip6_tnl_fill_info(struct sk_b
 420             nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
 421             nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
 422             nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
 423 -           nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
 424 +           nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
 425 +           !(fmrs = nla_nest_start(skb, IFLA_IPTUN_FMRS)))
 426                 goto nla_put_failure;
 427 +
 428 +       for (c = parm->fmrs; c; c = c->next) {
 429 +               struct nlattr *fmr = nla_nest_start(skb, ++fmrcnt);
 430 +               if (!fmr ||
 431 +                       nla_put(skb, IFLA_IPTUN_FMR_IP6_PREFIX,
 432 +                               sizeof(c->ip6_prefix), &c->ip6_prefix) ||
 433 +                       nla_put(skb, IFLA_IPTUN_FMR_IP4_PREFIX,
 434 +                               sizeof(c->ip4_prefix), &c->ip4_prefix) ||
 435 +                       nla_put_u8(skb, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, c->ip6_prefix_len) ||
 436 +                       nla_put_u8(skb, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, c->ip4_prefix_len) ||
 437 +                       nla_put_u8(skb, IFLA_IPTUN_FMR_EA_LEN, c->ea_len) ||
 438 +                       nla_put_u8(skb, IFLA_IPTUN_FMR_OFFSET, c->offset))
 439 +                               goto nla_put_failure;
 440 +
 441 +               nla_nest_end(skb, fmr);
 442 +       }
 443 +       nla_nest_end(skb, fmrs);
 444 +
 445         return 0;
 446
 447  nla_put_failure:
 448 @@ -1712,6 +1966,7 @@ static const struct nla_policy ip6_tnl_p
 449         [IFLA_IPTUN_FLOWINFO]           = { .type = NLA_U32 },
 450         [IFLA_IPTUN_FLAGS]              = { .type = NLA_U32 },
 451         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
 452 +       [IFLA_IPTUN_FMRS]               = { .type = NLA_NESTED },
 453  };
 454
 455  static struct rtnl_link_ops ip6_link_ops __read_mostly = {