ip6_gre.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *	GRE over IPv6 protocol decoder.
   4 *
   5 *	Authors: Dmitry Kozlov (xeb@mail.ru)
   6 */
   7
   8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10#include <linux/capability.h>
  11#include <linux/module.h>
  12#include <linux/types.h>
  13#include <linux/kernel.h>
  14#include <linux/slab.h>
  15#include <linux/uaccess.h>
  16#include <linux/skbuff.h>
  17#include <linux/netdevice.h>
  18#include <linux/in.h>
  19#include <linux/tcp.h>
  20#include <linux/udp.h>
  21#include <linux/if_arp.h>
  22#include <linux/init.h>
  23#include <linux/in6.h>
  24#include <linux/inetdevice.h>
  25#include <linux/igmp.h>
  26#include <linux/netfilter_ipv4.h>
  27#include <linux/etherdevice.h>
  28#include <linux/if_ether.h>
  29#include <linux/hash.h>
  30#include <linux/if_tunnel.h>
  31#include <linux/ip6_tunnel.h>
  32
  33#include <net/sock.h>
  34#include <net/ip.h>
  35#include <net/ip_tunnels.h>
  36#include <net/icmp.h>
  37#include <net/protocol.h>
  38#include <net/addrconf.h>
  39#include <net/arp.h>
  40#include <net/checksum.h>
  41#include <net/dsfield.h>
  42#include <net/inet_ecn.h>
  43#include <net/xfrm.h>
  44#include <net/net_namespace.h>
  45#include <net/netns/generic.h>
  46#include <net/netdev_lock.h>
  47#include <net/rtnetlink.h>
  48
  49#include <net/ipv6.h>
  50#include <net/ip6_fib.h>
  51#include <net/ip6_route.h>
  52#include <net/ip6_tunnel.h>
  53#include <net/gre.h>
  54#include <net/erspan.h>
  55#include <net/dst_metadata.h>
  56
  57
  58static bool log_ecn_error = true;
  59module_param(log_ecn_error, bool, 0644);
  60MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  61
  62#define IP6_GRE_HASH_SIZE_SHIFT  5
  63#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
  64
  65static unsigned int ip6gre_net_id __read_mostly;
  66struct ip6gre_net {
  67	struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
  68
  69	struct ip6_tnl __rcu *collect_md_tun;
  70	struct ip6_tnl __rcu *collect_md_tun_erspan;
  71	struct net_device *fb_tunnel_dev;
  72};
  73
  74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  75static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  76static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  77static int ip6gre_tunnel_init(struct net_device *dev);
  78static void ip6gre_tunnel_setup(struct net_device *dev);
  79static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  80static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  81static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  82
  83/* Tunnel hash table */
  84
  85/*
  86   4 hash tables:
  87
  88   3: (remote,local)
  89   2: (remote,*)
  90   1: (*,local)
  91   0: (*,*)
  92
  93   We require exact key match i.e. if a key is present in packet
  94   it will match only tunnel with the same key; if it is not present,
  95   it will match only keyless tunnel.
  96
  97   All keysless packets, if not matched configured keyless tunnels
  98   will match fallback tunnel.
  99 */
 100
 101#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 102static u32 HASH_ADDR(const struct in6_addr *addr)
 103{
 104	u32 hash = ipv6_addr_hash(addr);
 105
 106	return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 107}
 108
 109#define tunnels_r_l	tunnels[3]
 110#define tunnels_r	tunnels[2]
 111#define tunnels_l	tunnels[1]
 112#define tunnels_wc	tunnels[0]
 113
 114static bool ip6gre_tunnel_match(struct ip6_tnl *t, int dev_type, int link,
 115				int *cand_score, struct ip6_tnl **ret)
 116{
 117	int score = 0;
 118
 119	if (t->dev->type != ARPHRD_IP6GRE &&
 120	    t->dev->type != dev_type)
 121		return false;
 122
 123	if (t->parms.link != link)
 124		score |= 1;
 125	if (t->dev->type != dev_type)
 126		score |= 2;
 127	if (score == 0) {
 128		*ret = t;
 129		return true;
 130	}
 131
 132	if (score < *cand_score) {
 133		*ret = t;
 134		*cand_score = score;
 135	}
 136	return false;
 137}
 138
 139/* Given src, dst and key, find appropriate for input tunnel. */
 140static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 141		const struct in6_addr *remote, const struct in6_addr *local,
 142		__be32 key, __be16 gre_proto)
 143{
 144	struct net *net = dev_net(dev);
 145	int link = dev->ifindex;
 146	unsigned int h0 = HASH_ADDR(remote);
 147	unsigned int h1 = HASH_KEY(key);
 148	struct ip6_tnl *t, *cand = NULL;
 149	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 150	int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 151			gre_proto == htons(ETH_P_ERSPAN) ||
 152			gre_proto == htons(ETH_P_ERSPAN2)) ?
 153		       ARPHRD_ETHER : ARPHRD_IP6GRE;
 154	struct net_device *ndev;
 155	int cand_score = 4;
 156
 157	for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 158		if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 159		    !ipv6_addr_equal(remote, &t->parms.raddr) ||
 160		    key != t->parms.i_key ||
 161		    !(t->dev->flags & IFF_UP))
 162			continue;
 163
 164		if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
 165			return cand;
 166	}
 167
 168	for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 169		if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 170		    key != t->parms.i_key ||
 171		    !(t->dev->flags & IFF_UP))
 172			continue;
 173
 174		if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
 175			return cand;
 176	}
 177
 178	for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 179		if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 180			  (!ipv6_addr_equal(local, &t->parms.raddr) ||
 181				 !ipv6_addr_is_multicast(local))) ||
 182		    key != t->parms.i_key ||
 183		    !(t->dev->flags & IFF_UP))
 184			continue;
 185
 186		if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
 187			return cand;
 188	}
 189
 190	for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 191		if (t->parms.i_key != key ||
 192		    !(t->dev->flags & IFF_UP))
 193			continue;
 194
 195		if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
 196			return cand;
 197	}
 198
 199	if (cand)
 200		return cand;
 201
 202	if (gre_proto == htons(ETH_P_ERSPAN) ||
 203	    gre_proto == htons(ETH_P_ERSPAN2))
 204		t = rcu_dereference(ign->collect_md_tun_erspan);
 205	else
 206		t = rcu_dereference(ign->collect_md_tun);
 207
 208	if (t && t->dev->flags & IFF_UP)
 209		return t;
 210
 211	ndev = READ_ONCE(ign->fb_tunnel_dev);
 212	if (ndev && ndev->flags & IFF_UP)
 213		return netdev_priv(ndev);
 214
 215	return NULL;
 216}
 217
 218static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 219		const struct __ip6_tnl_parm *p)
 220{
 221	const struct in6_addr *remote = &p->raddr;
 222	const struct in6_addr *local = &p->laddr;
 223	unsigned int h = HASH_KEY(p->i_key);
 224	int prio = 0;
 225
 226	if (!ipv6_addr_any(local))
 227		prio |= 1;
 228	if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 229		prio |= 2;
 230		h ^= HASH_ADDR(remote);
 231	}
 232
 233	return &ign->tunnels[prio][h];
 234}
 235
 236static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 237{
 238	if (t->parms.collect_md)
 239		rcu_assign_pointer(ign->collect_md_tun, t);
 240}
 241
 242static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 243{
 244	if (t->parms.collect_md)
 245		rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 246}
 247
 248static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 249{
 250	if (t->parms.collect_md)
 251		rcu_assign_pointer(ign->collect_md_tun, NULL);
 252}
 253
 254static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 255				       struct ip6_tnl *t)
 256{
 257	if (t->parms.collect_md)
 258		rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 259}
 260
 261static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 262		const struct ip6_tnl *t)
 263{
 264	return __ip6gre_bucket(ign, &t->parms);
 265}
 266
 267static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 268{
 269	struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 270
 271	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 272	rcu_assign_pointer(*tp, t);
 273}
 274
 275static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 276{
 277	struct ip6_tnl __rcu **tp;
 278	struct ip6_tnl *iter;
 279
 280	for (tp = ip6gre_bucket(ign, t);
 281	     (iter = rtnl_dereference(*tp)) != NULL;
 282	     tp = &iter->next) {
 283		if (t == iter) {
 284			rcu_assign_pointer(*tp, t->next);
 285			break;
 286		}
 287	}
 288}
 289
 290static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 291					   const struct __ip6_tnl_parm *parms,
 292					   int type)
 293{
 294	const struct in6_addr *remote = &parms->raddr;
 295	const struct in6_addr *local = &parms->laddr;
 296	__be32 key = parms->i_key;
 297	int link = parms->link;
 298	struct ip6_tnl *t;
 299	struct ip6_tnl __rcu **tp;
 300	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 301
 302	for (tp = __ip6gre_bucket(ign, parms);
 303	     (t = rtnl_dereference(*tp)) != NULL;
 304	     tp = &t->next)
 305		if (ipv6_addr_equal(local, &t->parms.laddr) &&
 306		    ipv6_addr_equal(remote, &t->parms.raddr) &&
 307		    key == t->parms.i_key &&
 308		    link == t->parms.link &&
 309		    type == t->dev->type)
 310			break;
 311
 312	return t;
 313}
 314
 315static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 316		const struct __ip6_tnl_parm *parms, int create)
 317{
 318	struct ip6_tnl *t, *nt;
 319	struct net_device *dev;
 320	char name[IFNAMSIZ];
 321	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 322
 323	t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 324	if (t && create)
 325		return NULL;
 326	if (t || !create)
 327		return t;
 328
 329	if (parms->name[0]) {
 330		if (!dev_valid_name(parms->name))
 331			return NULL;
 332		strscpy(name, parms->name);
 333	} else {
 334		strscpy(name, "ip6gre%d");
 335	}
 336	dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 337			   ip6gre_tunnel_setup);
 338	if (!dev)
 339		return NULL;
 340
 341	dev_net_set(dev, net);
 342
 343	nt = netdev_priv(dev);
 344	nt->parms = *parms;
 345	dev->rtnl_link_ops = &ip6gre_link_ops;
 346
 347	nt->dev = dev;
 348	nt->net = dev_net(dev);
 349
 350	if (register_netdevice(dev) < 0)
 351		goto failed_free;
 352
 353	ip6gre_tnl_link_config(nt, 1);
 354	ip6gre_tunnel_link(ign, nt);
 355	return nt;
 356
 357failed_free:
 358	free_netdev(dev);
 359	return NULL;
 360}
 361
 362static void ip6erspan_tunnel_uninit(struct net_device *dev)
 363{
 364	struct ip6_tnl *t = netdev_priv(dev);
 365	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 366
 367	ip6erspan_tunnel_unlink_md(ign, t);
 368	ip6gre_tunnel_unlink(ign, t);
 369	dst_cache_reset(&t->dst_cache);
 370	netdev_put(dev, &t->dev_tracker);
 371}
 372
 373static void ip6gre_tunnel_uninit(struct net_device *dev)
 374{
 375	struct ip6_tnl *t = netdev_priv(dev);
 376	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 377
 378	ip6gre_tunnel_unlink_md(ign, t);
 379	ip6gre_tunnel_unlink(ign, t);
 380	if (ign->fb_tunnel_dev == dev)
 381		WRITE_ONCE(ign->fb_tunnel_dev, NULL);
 382	dst_cache_reset(&t->dst_cache);
 383	netdev_put(dev, &t->dev_tracker);
 384}
 385
 386
 387static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 388		       u8 type, u8 code, int offset, __be32 info)
 389{
 390	struct net *net = dev_net(skb->dev);
 391	const struct ipv6hdr *ipv6h;
 392	struct tnl_ptk_info tpi;
 393	struct ip6_tnl *t;
 394
 395	if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
 396			     offset) < 0)
 397		return -EINVAL;
 398
 399	ipv6h = (const struct ipv6hdr *)skb->data;
 400	t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 401				 tpi.key, tpi.proto);
 402	if (!t)
 403		return -ENOENT;
 404
 405	switch (type) {
 406	case ICMPV6_DEST_UNREACH:
 407		net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 408				    t->parms.name);
 409		if (code != ICMPV6_PORT_UNREACH)
 410			break;
 411		return 0;
 412	case ICMPV6_TIME_EXCEED:
 413		if (code == ICMPV6_EXC_HOPLIMIT) {
 414			net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 415					    t->parms.name);
 416			break;
 417		}
 418		return 0;
 419	case ICMPV6_PARAMPROB: {
 420		struct ipv6_tlv_tnl_enc_lim *tel;
 421		__u32 teli;
 422
 423		teli = 0;
 424		if (code == ICMPV6_HDR_FIELD)
 425			teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 426
 427		if (teli && teli == be32_to_cpu(info) - 2) {
 428			tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 429			if (tel->encap_limit == 0) {
 430				net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 431						    t->parms.name);
 432			}
 433		} else {
 434			net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 435					    t->parms.name);
 436		}
 437		return 0;
 438	}
 439	case ICMPV6_PKT_TOOBIG:
 440		ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 441		return 0;
 442	case NDISC_REDIRECT:
 443		ip6_redirect(skb, net, skb->dev->ifindex, 0,
 444			     sock_net_uid(net, NULL));
 445		return 0;
 446	}
 447
 448	if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 449		t->err_count++;
 450	else
 451		t->err_count = 1;
 452	t->err_time = jiffies;
 453
 454	return 0;
 455}
 456
 457static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 458{
 459	const struct ipv6hdr *ipv6h;
 460	struct ip6_tnl *tunnel;
 461
 462	ipv6h = ipv6_hdr(skb);
 463	tunnel = ip6gre_tunnel_lookup(skb->dev,
 464				      &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 465				      tpi->proto);
 466	if (tunnel) {
 467		if (tunnel->parms.collect_md) {
 468			IP_TUNNEL_DECLARE_FLAGS(flags);
 469			struct metadata_dst *tun_dst;
 470			__be64 tun_id;
 471
 472			ip_tunnel_flags_copy(flags, tpi->flags);
 473			tun_id = key32_to_tunnel_id(tpi->key);
 474
 475			tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 476			if (!tun_dst)
 477				return PACKET_REJECT;
 478
 479			ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 480		} else {
 481			ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 482		}
 483
 484		return PACKET_RCVD;
 485	}
 486
 487	return PACKET_REJECT;
 488}
 489
 490static int ip6erspan_rcv(struct sk_buff *skb,
 491			 struct tnl_ptk_info *tpi,
 492			 int gre_hdr_len)
 493{
 494	struct erspan_base_hdr *ershdr;
 495	const struct ipv6hdr *ipv6h;
 496	struct erspan_md2 *md2;
 497	struct ip6_tnl *tunnel;
 498	u8 ver;
 499
 500	if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
 501		return PACKET_REJECT;
 502
 503	ipv6h = ipv6_hdr(skb);
 504	ershdr = (struct erspan_base_hdr *)skb->data;
 505	ver = ershdr->ver;
 506
 507	tunnel = ip6gre_tunnel_lookup(skb->dev,
 508				      &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 509				      tpi->proto);
 510	if (tunnel) {
 511		int len = erspan_hdr_len(ver);
 512
 513		if (unlikely(!pskb_may_pull(skb, len)))
 514			return PACKET_REJECT;
 515
 516		if (__iptunnel_pull_header(skb, len,
 517					   htons(ETH_P_TEB),
 518					   false, false) < 0)
 519			return PACKET_REJECT;
 520
 521		if (tunnel->parms.collect_md) {
 522			struct erspan_metadata *pkt_md, *md;
 523			IP_TUNNEL_DECLARE_FLAGS(flags);
 524			struct metadata_dst *tun_dst;
 525			struct ip_tunnel_info *info;
 526			unsigned char *gh;
 527			__be64 tun_id;
 528
 529			__set_bit(IP_TUNNEL_KEY_BIT, tpi->flags);
 530			ip_tunnel_flags_copy(flags, tpi->flags);
 531			tun_id = key32_to_tunnel_id(tpi->key);
 532
 533			tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 534						  sizeof(*md));
 535			if (!tun_dst)
 536				return PACKET_REJECT;
 537
 538			/* MUST set options_len before referencing options */
 539			info = &tun_dst->u.tun_info;
 540			info->options_len = sizeof(*md);
 541
 542			/* skb can be uncloned in __iptunnel_pull_header, so
 543			 * old pkt_md is no longer valid and we need to reset
 544			 * it
 545			 */
 546			gh = skb_network_header(skb) +
 547			     skb_network_header_len(skb);
 548			pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 549							    sizeof(*ershdr));
 550			md = ip_tunnel_info_opts(info);
 551			md->version = ver;
 552			md2 = &md->u.md2;
 553			memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 554						       ERSPAN_V2_MDSIZE);
 555			__set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
 556				  info->key.tun_flags);
 557
 558			ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 559
 560		} else {
 561			ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 562		}
 563
 564		return PACKET_RCVD;
 565	}
 566
 567	return PACKET_REJECT;
 568}
 569
 570static int gre_rcv(struct sk_buff *skb)
 571{
 572	struct tnl_ptk_info tpi;
 573	bool csum_err = false;
 574	int hdr_len;
 575
 576	hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 577	if (hdr_len < 0)
 578		goto drop;
 579
 580	if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 581		goto drop;
 582
 583	if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 584		     tpi.proto == htons(ETH_P_ERSPAN2))) {
 585		if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 586			return 0;
 587		goto out;
 588	}
 589
 590	if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 591		return 0;
 592
 593out:
 594	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 595drop:
 596	kfree_skb(skb);
 597	return 0;
 598}
 599
 600static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 601{
 602	return iptunnel_handle_offloads(skb,
 603					csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 604}
 605
 606static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 607				     struct net_device *dev,
 608				     struct flowi6 *fl6, __u8 *dsfield,
 609				     int *encap_limit)
 610{
 611	const struct iphdr *iph = ip_hdr(skb);
 612	struct ip6_tnl *t = netdev_priv(dev);
 613
 614	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 615		*encap_limit = t->parms.encap_limit;
 616
 617	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 618
 619	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 620		*dsfield = ipv4_get_dsfield(iph);
 621	else
 622		*dsfield = ip6_tclass(t->parms.flowinfo);
 623
 624	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 625		fl6->flowi6_mark = skb->mark;
 626	else
 627		fl6->flowi6_mark = t->parms.fwmark;
 628
 629	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 630}
 631
 632static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 633				    struct net_device *dev,
 634				    struct flowi6 *fl6, __u8 *dsfield,
 635				    int *encap_limit)
 636{
 637	struct ipv6hdr *ipv6h;
 638	struct ip6_tnl *t = netdev_priv(dev);
 639	__u16 offset;
 640
 641	offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 642	/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 643	ipv6h = ipv6_hdr(skb);
 644
 645	if (offset > 0) {
 646		struct ipv6_tlv_tnl_enc_lim *tel;
 647
 648		tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 649		if (tel->encap_limit == 0) {
 650			icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
 651					ICMPV6_HDR_FIELD, offset + 2);
 652			return -1;
 653		}
 654		*encap_limit = tel->encap_limit - 1;
 655	} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 656		*encap_limit = t->parms.encap_limit;
 657	}
 658
 659	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 660
 661	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 662		*dsfield = ipv6_get_dsfield(ipv6h);
 663	else
 664		*dsfield = ip6_tclass(t->parms.flowinfo);
 665
 666	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 667		fl6->flowlabel |= ip6_flowlabel(ipv6h);
 668
 669	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 670		fl6->flowi6_mark = skb->mark;
 671	else
 672		fl6->flowi6_mark = t->parms.fwmark;
 673
 674	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 675
 676	return 0;
 677}
 678
 679static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
 680				     struct net_device *dev,
 681				     struct flowi6 *fl6, __u8 *dsfield,
 682				     int *encap_limit)
 683{
 684	struct ip6_tnl *t = netdev_priv(dev);
 685
 686	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 687		*encap_limit = t->parms.encap_limit;
 688
 689	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 690
 691	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 692		*dsfield = 0;
 693	else
 694		*dsfield = ip6_tclass(t->parms.flowinfo);
 695
 696	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 697		fl6->flowi6_mark = skb->mark;
 698	else
 699		fl6->flowi6_mark = t->parms.fwmark;
 700
 701	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 702
 703	return 0;
 704}
 705
 706static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
 707{
 708	struct ip_tunnel_info *tun_info;
 709
 710	tun_info = skb_tunnel_info(skb);
 711	if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
 712		return ERR_PTR(-EINVAL);
 713
 714	return tun_info;
 715}
 716
 717static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 718			       struct net_device *dev, __u8 dsfield,
 719			       struct flowi6 *fl6, int encap_limit,
 720			       __u32 *pmtu, __be16 proto)
 721{
 722	struct ip6_tnl *tunnel = netdev_priv(dev);
 723	IP_TUNNEL_DECLARE_FLAGS(flags);
 724	__be16 protocol;
 725
 726	if (dev->type == ARPHRD_ETHER)
 727		IPCB(skb)->flags = 0;
 728
 729	if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 730		fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 731	else
 732		fl6->daddr = tunnel->parms.raddr;
 733
 734	/* Push GRE header. */
 735	protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 736
 737	if (tunnel->parms.collect_md) {
 738		struct ip_tunnel_info *tun_info;
 739		const struct ip_tunnel_key *key;
 740		int tun_hlen;
 741
 742		tun_info = skb_tunnel_info_txcheck(skb);
 743		if (IS_ERR(tun_info) ||
 744		    unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 745			return -EINVAL;
 746
 747		key = &tun_info->key;
 748		memset(fl6, 0, sizeof(*fl6));
 749		fl6->flowi6_proto = IPPROTO_GRE;
 750		fl6->daddr = key->u.ipv6.dst;
 751		fl6->flowlabel = key->label;
 752		fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 753		fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
 754
 755		dsfield = key->tos;
 756		ip_tunnel_flags_zero(flags);
 757		__set_bit(IP_TUNNEL_CSUM_BIT, flags);
 758		__set_bit(IP_TUNNEL_KEY_BIT, flags);
 759		__set_bit(IP_TUNNEL_SEQ_BIT, flags);
 760		ip_tunnel_flags_and(flags, flags, key->tun_flags);
 761		tun_hlen = gre_calc_hlen(flags);
 762
 763		if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
 764			return -ENOMEM;
 765
 766		gre_build_header(skb, tun_hlen,
 767				 flags, protocol,
 768				 tunnel_id_to_key32(tun_info->key.tun_id),
 769				 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
 770				 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
 771				 0);
 772
 773	} else {
 774		if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 775			return -ENOMEM;
 776
 777		ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
 778
 779		gre_build_header(skb, tunnel->tun_hlen, flags,
 780				 protocol, tunnel->parms.o_key,
 781				 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
 782				 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
 783				 0);
 784	}
 785
 786	return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 787			    NEXTHDR_GRE);
 788}
 789
 790static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 791{
 792	struct ip6_tnl *t = netdev_priv(dev);
 793	int encap_limit = -1;
 794	struct flowi6 fl6;
 795	__u8 dsfield = 0;
 796	__u32 mtu;
 797	int err;
 798
 799	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 800
 801	if (!t->parms.collect_md)
 802		prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 803					 &dsfield, &encap_limit);
 804
 805	err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 806						t->parms.o_flags));
 807	if (err)
 808		return -1;
 809
 810	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 811			  skb->protocol);
 812	if (err != 0) {
 813		/* XXX: send ICMP error even if DF is not set. */
 814		if (err == -EMSGSIZE)
 815			icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 816				      htonl(mtu));
 817		return -1;
 818	}
 819
 820	return 0;
 821}
 822
 823static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 824{
 825	struct ip6_tnl *t = netdev_priv(dev);
 826	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 827	int encap_limit = -1;
 828	struct flowi6 fl6;
 829	__u8 dsfield = 0;
 830	__u32 mtu;
 831	int err;
 832
 833	if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 834		return -1;
 835
 836	if (!t->parms.collect_md &&
 837	    prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 838		return -1;
 839
 840	if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 841					      t->parms.o_flags)))
 842		return -1;
 843
 844	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 845			  &mtu, skb->protocol);
 846	if (err != 0) {
 847		if (err == -EMSGSIZE)
 848			icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 849		return -1;
 850	}
 851
 852	return 0;
 853}
 854
 855static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 856{
 857	struct ip6_tnl *t = netdev_priv(dev);
 858	int encap_limit = -1;
 859	struct flowi6 fl6;
 860	__u8 dsfield = 0;
 861	__u32 mtu;
 862	int err;
 863
 864	if (!t->parms.collect_md &&
 865	    prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
 866		return -1;
 867
 868	err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 869						t->parms.o_flags));
 870	if (err)
 871		return err;
 872	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
 873
 874	return err;
 875}
 876
 877static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 878	struct net_device *dev)
 879{
 880	struct ip6_tnl *t = netdev_priv(dev);
 881	__be16 payload_protocol;
 882	int ret;
 883
 884	if (!pskb_inet_may_pull(skb))
 885		goto tx_err;
 886
 887	if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 888		goto tx_err;
 889
 890	payload_protocol = skb_protocol(skb, true);
 891	switch (payload_protocol) {
 892	case htons(ETH_P_IP):
 893		ret = ip6gre_xmit_ipv4(skb, dev);
 894		break;
 895	case htons(ETH_P_IPV6):
 896		ret = ip6gre_xmit_ipv6(skb, dev);
 897		break;
 898	default:
 899		ret = ip6gre_xmit_other(skb, dev);
 900		break;
 901	}
 902
 903	if (ret < 0)
 904		goto tx_err;
 905
 906	return NETDEV_TX_OK;
 907
 908tx_err:
 909	if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
 910		DEV_STATS_INC(dev, tx_errors);
 911	DEV_STATS_INC(dev, tx_dropped);
 912	kfree_skb(skb);
 913	return NETDEV_TX_OK;
 914}
 915
 916static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 917					 struct net_device *dev)
 918{
 919	struct ip_tunnel_info *tun_info = NULL;
 920	struct ip6_tnl *t = netdev_priv(dev);
 921	struct dst_entry *dst = skb_dst(skb);
 922	IP_TUNNEL_DECLARE_FLAGS(flags) = { };
 923	bool truncate = false;
 924	int encap_limit = -1;
 925	__u8 dsfield = false;
 926	struct flowi6 fl6;
 927	int err = -EINVAL;
 928	__be16 proto;
 929	__u32 mtu;
 930	int nhoff;
 931
 932	if (!pskb_inet_may_pull(skb))
 933		goto tx_err;
 934
 935	if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 936		goto tx_err;
 937
 938	if (gre_handle_offloads(skb, false))
 939		goto tx_err;
 940
 941	if (skb->len > dev->mtu + dev->hard_header_len) {
 942		if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
 943			goto tx_err;
 944		truncate = true;
 945	}
 946
 947	nhoff = skb_network_offset(skb);
 948	if (skb->protocol == htons(ETH_P_IP) &&
 949	    (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 950		truncate = true;
 951
 952	if (skb->protocol == htons(ETH_P_IPV6)) {
 953		int thoff;
 954
 955		if (skb_transport_header_was_set(skb))
 956			thoff = skb_transport_offset(skb);
 957		else
 958			thoff = nhoff + sizeof(struct ipv6hdr);
 959		if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
 960			truncate = true;
 961	}
 962
 963	if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 964		goto tx_err;
 965
 966	__clear_bit(IP_TUNNEL_KEY_BIT, t->parms.o_flags);
 967	IPCB(skb)->flags = 0;
 968
 969	/* For collect_md mode, derive fl6 from the tunnel key,
 970	 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 971	 */
 972	if (t->parms.collect_md) {
 973		const struct ip_tunnel_key *key;
 974		struct erspan_metadata *md;
 975		__be32 tun_id;
 976
 977		tun_info = skb_tunnel_info_txcheck(skb);
 978		if (IS_ERR(tun_info) ||
 979		    unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 980			goto tx_err;
 981
 982		key = &tun_info->key;
 983		memset(&fl6, 0, sizeof(fl6));
 984		fl6.flowi6_proto = IPPROTO_GRE;
 985		fl6.daddr = key->u.ipv6.dst;
 986		fl6.flowlabel = key->label;
 987		fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 988		fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
 989
 990		dsfield = key->tos;
 991		if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
 992			      tun_info->key.tun_flags))
 993			goto tx_err;
 994		if (tun_info->options_len < sizeof(*md))
 995			goto tx_err;
 996		md = ip_tunnel_info_opts(tun_info);
 997
 998		tun_id = tunnel_id_to_key32(key->tun_id);
 999		if (md->version == 1) {
1000			erspan_build_header(skb,
1001					    ntohl(tun_id),
1002					    ntohl(md->u.index), truncate,
1003					    false);
1004			proto = htons(ETH_P_ERSPAN);
1005		} else if (md->version == 2) {
1006			erspan_build_header_v2(skb,
1007					       ntohl(tun_id),
1008					       md->u.md2.dir,
1009					       get_hwid(&md->u.md2),
1010					       truncate, false);
1011			proto = htons(ETH_P_ERSPAN2);
1012		} else {
1013			goto tx_err;
1014		}
1015	} else {
1016		switch (skb->protocol) {
1017		case htons(ETH_P_IP):
1018			memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1019			prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1020						 &dsfield, &encap_limit);
1021			break;
1022		case htons(ETH_P_IPV6):
1023			if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1024				goto tx_err;
1025			if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1026						     &dsfield, &encap_limit))
1027				goto tx_err;
1028			break;
1029		default:
1030			memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1031			break;
1032		}
1033
1034		if (t->parms.erspan_ver == 1) {
1035			erspan_build_header(skb, ntohl(t->parms.o_key),
1036					    t->parms.index,
1037					    truncate, false);
1038			proto = htons(ETH_P_ERSPAN);
1039		} else if (t->parms.erspan_ver == 2) {
1040			erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1041					       t->parms.dir,
1042					       t->parms.hwid,
1043					       truncate, false);
1044			proto = htons(ETH_P_ERSPAN2);
1045		} else {
1046			goto tx_err;
1047		}
1048
1049		fl6.daddr = t->parms.raddr;
1050	}
1051
1052	/* Push GRE header. */
1053	__set_bit(IP_TUNNEL_SEQ_BIT, flags);
1054	gre_build_header(skb, 8, flags, proto, 0,
1055			 htonl(atomic_fetch_inc(&t->o_seqno)));
1056
1057	/* TooBig packet may have updated dst->dev's mtu */
1058	if (!t->parms.collect_md && dst) {
1059		mtu = READ_ONCE(dst_dev(dst)->mtu);
1060		if (dst_mtu(dst) > mtu)
1061			dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
1062	}
1063	err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1064			   NEXTHDR_GRE);
1065	if (err != 0) {
1066		/* XXX: send ICMP error even if DF is not set. */
1067		if (err == -EMSGSIZE) {
1068			if (skb->protocol == htons(ETH_P_IP))
1069				icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1070					      ICMP_FRAG_NEEDED, htonl(mtu));
1071			else
1072				icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1073		}
1074
1075		goto tx_err;
1076	}
1077	return NETDEV_TX_OK;
1078
1079tx_err:
1080	if (!IS_ERR(tun_info))
1081		DEV_STATS_INC(dev, tx_errors);
1082	DEV_STATS_INC(dev, tx_dropped);
1083	kfree_skb(skb);
1084	return NETDEV_TX_OK;
1085}
1086
1087static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1088{
1089	struct net_device *dev = t->dev;
1090	struct __ip6_tnl_parm *p = &t->parms;
1091	struct flowi6 *fl6 = &t->fl.u.ip6;
1092
1093	if (dev->type != ARPHRD_ETHER) {
1094		__dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1095		memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1096	}
1097
1098	/* Set up flowi template */
1099	fl6->saddr = p->laddr;
1100	fl6->daddr = p->raddr;
1101	fl6->flowi6_oif = p->link;
1102	fl6->flowlabel = 0;
1103	fl6->flowi6_proto = IPPROTO_GRE;
1104	fl6->fl6_gre_key = t->parms.o_key;
1105
1106	if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1107		fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1108	if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1109		fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1110
1111	p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1112	p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1113
1114	if (p->flags&IP6_TNL_F_CAP_XMIT &&
1115			p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1116		dev->flags |= IFF_POINTOPOINT;
1117	else
1118		dev->flags &= ~IFF_POINTOPOINT;
1119}
1120
1121static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1122					 int t_hlen)
1123{
1124	const struct __ip6_tnl_parm *p = &t->parms;
1125	struct net_device *dev = t->dev;
1126
1127	if (p->flags & IP6_TNL_F_CAP_XMIT) {
1128		int strict = (ipv6_addr_type(&p->raddr) &
1129			      (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1130
1131		struct rt6_info *rt = rt6_lookup(t->net,
1132						 &p->raddr, &p->laddr,
1133						 p->link, NULL, strict);
1134
1135		if (!rt)
1136			return;
1137
1138		if (rt->dst.dev) {
1139			unsigned short dst_len = rt->dst.dev->hard_header_len +
1140						 t_hlen;
1141
1142			if (t->dev->header_ops)
1143				dev->hard_header_len = dst_len;
1144			else
1145				dev->needed_headroom = dst_len;
1146
1147			if (set_mtu) {
1148				int mtu = rt->dst.dev->mtu - t_hlen;
1149
1150				if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1151					mtu -= 8;
1152				if (dev->type == ARPHRD_ETHER)
1153					mtu -= ETH_HLEN;
1154
1155				if (mtu < IPV6_MIN_MTU)
1156					mtu = IPV6_MIN_MTU;
1157				WRITE_ONCE(dev->mtu, mtu);
1158			}
1159		}
1160		ip6_rt_put(rt);
1161	}
1162}
1163
1164static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1165{
1166	int t_hlen;
1167
1168	tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1169	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1170
1171	t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1172
1173	if (tunnel->dev->header_ops)
1174		tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1175	else
1176		tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1177
1178	return t_hlen;
1179}
1180
1181static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1182{
1183	ip6gre_tnl_link_config_common(t);
1184	ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1185}
1186
1187static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1188				     const struct __ip6_tnl_parm *p)
1189{
1190	t->parms.laddr = p->laddr;
1191	t->parms.raddr = p->raddr;
1192	t->parms.flags = p->flags;
1193	t->parms.hop_limit = p->hop_limit;
1194	t->parms.encap_limit = p->encap_limit;
1195	t->parms.flowinfo = p->flowinfo;
1196	t->parms.link = p->link;
1197	t->parms.proto = p->proto;
1198	t->parms.i_key = p->i_key;
1199	t->parms.o_key = p->o_key;
1200	ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
1201	ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
1202	t->parms.fwmark = p->fwmark;
1203	t->parms.erspan_ver = p->erspan_ver;
1204	t->parms.index = p->index;
1205	t->parms.dir = p->dir;
1206	t->parms.hwid = p->hwid;
1207	dst_cache_reset(&t->dst_cache);
1208}
1209
1210static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1211			     int set_mtu)
1212{
1213	ip6gre_tnl_copy_tnl_parm(t, p);
1214	ip6gre_tnl_link_config(t, set_mtu);
1215	return 0;
1216}
1217
1218static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1219	const struct ip6_tnl_parm2 *u)
1220{
1221	p->laddr = u->laddr;
1222	p->raddr = u->raddr;
1223	p->flags = u->flags;
1224	p->hop_limit = u->hop_limit;
1225	p->encap_limit = u->encap_limit;
1226	p->flowinfo = u->flowinfo;
1227	p->link = u->link;
1228	p->i_key = u->i_key;
1229	p->o_key = u->o_key;
1230	gre_flags_to_tnl_flags(p->i_flags, u->i_flags);
1231	gre_flags_to_tnl_flags(p->o_flags, u->o_flags);
1232	memcpy(p->name, u->name, sizeof(u->name));
1233}
1234
1235static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1236	const struct __ip6_tnl_parm *p)
1237{
1238	u->proto = IPPROTO_GRE;
1239	u->laddr = p->laddr;
1240	u->raddr = p->raddr;
1241	u->flags = p->flags;
1242	u->hop_limit = p->hop_limit;
1243	u->encap_limit = p->encap_limit;
1244	u->flowinfo = p->flowinfo;
1245	u->link = p->link;
1246	u->i_key = p->i_key;
1247	u->o_key = p->o_key;
1248	u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1249	u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1250	memcpy(u->name, p->name, sizeof(u->name));
1251}
1252
1253static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1254					struct ifreq *ifr, void __user *data,
1255					int cmd)
1256{
1257	int err = 0;
1258	struct ip6_tnl_parm2 p;
1259	struct __ip6_tnl_parm p1;
1260	struct ip6_tnl *t = netdev_priv(dev);
1261	struct net *net = t->net;
1262	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1263
1264	memset(&p1, 0, sizeof(p1));
1265
1266	switch (cmd) {
1267	case SIOCGETTUNNEL:
1268		if (dev == ign->fb_tunnel_dev) {
1269			if (copy_from_user(&p, data, sizeof(p))) {
1270				err = -EFAULT;
1271				break;
1272			}
1273			ip6gre_tnl_parm_from_user(&p1, &p);
1274			t = ip6gre_tunnel_locate(net, &p1, 0);
1275			if (!t)
1276				t = netdev_priv(dev);
1277		}
1278		memset(&p, 0, sizeof(p));
1279		ip6gre_tnl_parm_to_user(&p, &t->parms);
1280		if (copy_to_user(data, &p, sizeof(p)))
1281			err = -EFAULT;
1282		break;
1283
1284	case SIOCADDTUNNEL:
1285	case SIOCCHGTUNNEL:
1286		err = -EPERM;
1287		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1288			goto done;
1289
1290		err = -EFAULT;
1291		if (copy_from_user(&p, data, sizeof(p)))
1292			goto done;
1293
1294		err = -EINVAL;
1295		if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1296			goto done;
1297
1298		if (!(p.i_flags&GRE_KEY))
1299			p.i_key = 0;
1300		if (!(p.o_flags&GRE_KEY))
1301			p.o_key = 0;
1302
1303		ip6gre_tnl_parm_from_user(&p1, &p);
1304		t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1305
1306		if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1307			if (t) {
1308				if (t->dev != dev) {
1309					err = -EEXIST;
1310					break;
1311				}
1312			} else {
1313				t = netdev_priv(dev);
1314
1315				ip6gre_tunnel_unlink(ign, t);
1316				synchronize_net();
1317				ip6gre_tnl_change(t, &p1, 1);
1318				ip6gre_tunnel_link(ign, t);
1319				netdev_state_change(dev);
1320			}
1321		}
1322
1323		if (t) {
1324			err = 0;
1325
1326			memset(&p, 0, sizeof(p));
1327			ip6gre_tnl_parm_to_user(&p, &t->parms);
1328			if (copy_to_user(data, &p, sizeof(p)))
1329				err = -EFAULT;
1330		} else
1331			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1332		break;
1333
1334	case SIOCDELTUNNEL:
1335		err = -EPERM;
1336		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1337			goto done;
1338
1339		if (dev == ign->fb_tunnel_dev) {
1340			err = -EFAULT;
1341			if (copy_from_user(&p, data, sizeof(p)))
1342				goto done;
1343			err = -ENOENT;
1344			ip6gre_tnl_parm_from_user(&p1, &p);
1345			t = ip6gre_tunnel_locate(net, &p1, 0);
1346			if (!t)
1347				goto done;
1348			err = -EPERM;
1349			if (t == netdev_priv(ign->fb_tunnel_dev))
1350				goto done;
1351			dev = t->dev;
1352		}
1353		unregister_netdevice(dev);
1354		err = 0;
1355		break;
1356
1357	default:
1358		err = -EINVAL;
1359	}
1360
1361done:
1362	return err;
1363}
1364
1365static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1366			 unsigned short type, const void *daddr,
1367			 const void *saddr, unsigned int len)
1368{
1369	struct ip6_tnl *t = netdev_priv(dev);
1370	struct ipv6hdr *ipv6h;
1371	int needed;
1372	__be16 *p;
1373
1374	needed = t->hlen + sizeof(*ipv6h);
1375	if (skb_headroom(skb) < needed &&
1376	    pskb_expand_head(skb, HH_DATA_ALIGN(needed - skb_headroom(skb)),
1377			     0, GFP_ATOMIC))
1378		return -needed;
1379
1380	ipv6h = skb_push(skb, needed);
1381	ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1382						  t->fl.u.ip6.flowlabel,
1383						  true, &t->fl.u.ip6));
1384	ipv6h->hop_limit = t->parms.hop_limit;
1385	ipv6h->nexthdr = NEXTHDR_GRE;
1386	ipv6h->saddr = t->parms.laddr;
1387	ipv6h->daddr = t->parms.raddr;
1388
1389	p = (__be16 *)(ipv6h + 1);
1390	p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags);
1391	p[1] = htons(type);
1392
1393	/*
1394	 *	Set the source hardware address.
1395	 */
1396
1397	if (saddr)
1398		memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1399	if (daddr)
1400		memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1401	if (!ipv6_addr_any(&ipv6h->daddr))
1402		return t->hlen;
1403
1404	return -t->hlen;
1405}
1406
1407static const struct header_ops ip6gre_header_ops = {
1408	.create	= ip6gre_header,
1409};
1410
1411static const struct net_device_ops ip6gre_netdev_ops = {
1412	.ndo_init		= ip6gre_tunnel_init,
1413	.ndo_uninit		= ip6gre_tunnel_uninit,
1414	.ndo_start_xmit		= ip6gre_tunnel_xmit,
1415	.ndo_siocdevprivate	= ip6gre_tunnel_siocdevprivate,
1416	.ndo_change_mtu		= ip6_tnl_change_mtu,
1417	.ndo_get_iflink		= ip6_tnl_get_iflink,
1418};
1419
1420static void ip6gre_dev_free(struct net_device *dev)
1421{
1422	struct ip6_tnl *t = netdev_priv(dev);
1423
1424	gro_cells_destroy(&t->gro_cells);
1425	dst_cache_destroy(&t->dst_cache);
1426}
1427
1428static void ip6gre_tunnel_setup(struct net_device *dev)
1429{
1430	dev->netdev_ops = &ip6gre_netdev_ops;
1431	dev->needs_free_netdev = true;
1432	dev->priv_destructor = ip6gre_dev_free;
1433
1434	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1435	dev->type = ARPHRD_IP6GRE;
1436
1437	dev->flags |= IFF_NOARP;
1438	dev->addr_len = sizeof(struct in6_addr);
1439	netif_keep_dst(dev);
1440	/* This perm addr will be used as interface identifier by IPv6 */
1441	dev->addr_assign_type = NET_ADDR_RANDOM;
1442	eth_random_addr(dev->perm_addr);
1443}
1444
1445#define GRE6_FEATURES (NETIF_F_SG |		\
1446		       NETIF_F_FRAGLIST |	\
1447		       NETIF_F_HIGHDMA |	\
1448		       NETIF_F_HW_CSUM)
1449
1450static void ip6gre_tnl_init_features(struct net_device *dev)
1451{
1452	struct ip6_tnl *nt = netdev_priv(dev);
1453
1454	dev->features		|= GRE6_FEATURES;
1455	dev->hw_features	|= GRE6_FEATURES;
1456
1457	/* TCP offload with GRE SEQ is not supported, nor can we support 2
1458	 * levels of outer headers requiring an update.
1459	 */
1460	if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags))
1461		return;
1462	if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) &&
1463	    nt->encap.type != TUNNEL_ENCAP_NONE)
1464		return;
1465
1466	dev->features |= NETIF_F_GSO_SOFTWARE;
1467	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1468
1469	dev->lltx = true;
1470}
1471
1472static int ip6gre_tunnel_init_common(struct net_device *dev)
1473{
1474	struct ip6_tnl *tunnel;
1475	int ret;
1476	int t_hlen;
1477
1478	tunnel = netdev_priv(dev);
1479
1480	tunnel->dev = dev;
1481	strscpy(tunnel->parms.name, dev->name);
1482
1483	ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1484	if (ret)
1485		return ret;
1486
1487	ret = gro_cells_init(&tunnel->gro_cells, dev);
1488	if (ret)
1489		goto cleanup_dst_cache_init;
1490
1491	t_hlen = ip6gre_calc_hlen(tunnel);
1492	dev->mtu = ETH_DATA_LEN - t_hlen;
1493	if (dev->type == ARPHRD_ETHER)
1494		dev->mtu -= ETH_HLEN;
1495	if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1496		dev->mtu -= 8;
1497
1498	if (tunnel->parms.collect_md) {
1499		netif_keep_dst(dev);
1500	}
1501	ip6gre_tnl_init_features(dev);
1502
1503	netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1504	netdev_lockdep_set_classes(dev);
1505	return 0;
1506
1507cleanup_dst_cache_init:
1508	dst_cache_destroy(&tunnel->dst_cache);
1509	return ret;
1510}
1511
1512static int ip6gre_tunnel_init(struct net_device *dev)
1513{
1514	struct ip6_tnl *tunnel;
1515	int ret;
1516
1517	ret = ip6gre_tunnel_init_common(dev);
1518	if (ret)
1519		return ret;
1520
1521	tunnel = netdev_priv(dev);
1522
1523	if (tunnel->parms.collect_md)
1524		return 0;
1525
1526	__dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1527	memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1528
1529	if (ipv6_addr_any(&tunnel->parms.raddr))
1530		dev->header_ops = &ip6gre_header_ops;
1531
1532	return 0;
1533}
1534
1535static void ip6gre_fb_tunnel_init(struct net_device *dev)
1536{
1537	struct ip6_tnl *tunnel = netdev_priv(dev);
1538
1539	tunnel->dev = dev;
1540	tunnel->net = dev_net(dev);
1541	strscpy(tunnel->parms.name, dev->name);
1542
1543	tunnel->hlen		= sizeof(struct ipv6hdr) + 4;
1544}
1545
1546static struct inet6_protocol ip6gre_protocol __read_mostly = {
1547	.handler     = gre_rcv,
1548	.err_handler = ip6gre_err,
1549	.flags       = INET6_PROTO_FINAL,
1550};
1551
1552static void __net_exit ip6gre_exit_rtnl_net(struct net *net, struct list_head *head)
1553{
1554	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1555	struct net_device *dev, *aux;
1556	int prio;
1557
1558	for_each_netdev_safe(net, dev, aux)
1559		if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1560		    dev->rtnl_link_ops == &ip6gre_tap_ops ||
1561		    dev->rtnl_link_ops == &ip6erspan_tap_ops)
1562			unregister_netdevice_queue(dev, head);
1563
1564	for (prio = 0; prio < 4; prio++) {
1565		int h;
1566		for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1567			struct ip6_tnl *t;
1568
1569			t = rtnl_net_dereference(net, ign->tunnels[prio][h]);
1570
1571			while (t) {
1572				/* If dev is in the same netns, it has already
1573				 * been added to the list by the previous loop.
1574				 */
1575				if (!net_eq(dev_net(t->dev), net))
1576					unregister_netdevice_queue(t->dev, head);
1577
1578				t = rtnl_net_dereference(net, t->next);
1579			}
1580		}
1581	}
1582}
1583
1584static int __net_init ip6gre_init_net(struct net *net)
1585{
1586	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1587	struct net_device *ndev;
1588	int err;
1589
1590	if (!net_has_fallback_tunnels(net))
1591		return 0;
1592	ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1593			    NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1594	if (!ndev) {
1595		err = -ENOMEM;
1596		goto err_alloc_dev;
1597	}
1598	ign->fb_tunnel_dev = ndev;
1599	dev_net_set(ign->fb_tunnel_dev, net);
1600	/* FB netdevice is special: we have one, and only one per netns.
1601	 * Allowing to move it to another netns is clearly unsafe.
1602	 */
1603	ign->fb_tunnel_dev->netns_immutable = true;
1604
1605	ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1606	ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1607
1608	err = register_netdev(ign->fb_tunnel_dev);
1609	if (err)
1610		goto err_reg_dev;
1611
1612	rcu_assign_pointer(ign->tunnels_wc[0],
1613			   netdev_priv(ign->fb_tunnel_dev));
1614	return 0;
1615
1616err_reg_dev:
1617	free_netdev(ndev);
1618err_alloc_dev:
1619	return err;
1620}
1621
1622static struct pernet_operations ip6gre_net_ops = {
1623	.init = ip6gre_init_net,
1624	.exit_rtnl = ip6gre_exit_rtnl_net,
1625	.id   = &ip6gre_net_id,
1626	.size = sizeof(struct ip6gre_net),
1627};
1628
1629static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1630				  struct netlink_ext_ack *extack)
1631{
1632	__be16 flags;
1633
1634	if (!data)
1635		return 0;
1636
1637	flags = 0;
1638	if (data[IFLA_GRE_IFLAGS])
1639		flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1640	if (data[IFLA_GRE_OFLAGS])
1641		flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1642	if (flags & (GRE_VERSION|GRE_ROUTING))
1643		return -EINVAL;
1644
1645	return 0;
1646}
1647
1648static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1649			       struct netlink_ext_ack *extack)
1650{
1651	struct in6_addr daddr;
1652
1653	if (tb[IFLA_ADDRESS]) {
1654		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1655			return -EINVAL;
1656		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1657			return -EADDRNOTAVAIL;
1658	}
1659
1660	if (!data)
1661		goto out;
1662
1663	if (data[IFLA_GRE_REMOTE]) {
1664		daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1665		if (ipv6_addr_any(&daddr))
1666			return -EINVAL;
1667	}
1668
1669out:
1670	return ip6gre_tunnel_validate(tb, data, extack);
1671}
1672
1673static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1674				  struct netlink_ext_ack *extack)
1675{
1676	__be16 flags = 0;
1677	int ret, ver = 0;
1678
1679	if (!data)
1680		return 0;
1681
1682	ret = ip6gre_tap_validate(tb, data, extack);
1683	if (ret)
1684		return ret;
1685
1686	/* ERSPAN should only have GRE sequence and key flag */
1687	if (data[IFLA_GRE_OFLAGS])
1688		flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1689	if (data[IFLA_GRE_IFLAGS])
1690		flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1691	if (!data[IFLA_GRE_COLLECT_METADATA] &&
1692	    flags != (GRE_SEQ | GRE_KEY))
1693		return -EINVAL;
1694
1695	/* ERSPAN Session ID only has 10-bit. Since we reuse
1696	 * 32-bit key field as ID, check it's range.
1697	 */
1698	if (data[IFLA_GRE_IKEY] &&
1699	    (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1700		return -EINVAL;
1701
1702	if (data[IFLA_GRE_OKEY] &&
1703	    (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1704		return -EINVAL;
1705
1706	if (data[IFLA_GRE_ERSPAN_VER]) {
1707		ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1708		if (ver != 1 && ver != 2)
1709			return -EINVAL;
1710	}
1711
1712	if (ver == 1) {
1713		if (data[IFLA_GRE_ERSPAN_INDEX]) {
1714			u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1715
1716			if (index & ~INDEX_MASK)
1717				return -EINVAL;
1718		}
1719	} else if (ver == 2) {
1720		if (data[IFLA_GRE_ERSPAN_DIR]) {
1721			u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1722
1723			if (dir & ~(DIR_MASK >> DIR_OFFSET))
1724				return -EINVAL;
1725		}
1726
1727		if (data[IFLA_GRE_ERSPAN_HWID]) {
1728			u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1729
1730			if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1731				return -EINVAL;
1732		}
1733	}
1734
1735	return 0;
1736}
1737
1738static void ip6erspan_set_version(struct nlattr *data[],
1739				  struct __ip6_tnl_parm *parms)
1740{
1741	if (!data)
1742		return;
1743
1744	parms->erspan_ver = 1;
1745	if (data[IFLA_GRE_ERSPAN_VER])
1746		parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1747
1748	if (parms->erspan_ver == 1) {
1749		if (data[IFLA_GRE_ERSPAN_INDEX])
1750			parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1751	} else if (parms->erspan_ver == 2) {
1752		if (data[IFLA_GRE_ERSPAN_DIR])
1753			parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1754		if (data[IFLA_GRE_ERSPAN_HWID])
1755			parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1756	}
1757}
1758
1759static void ip6gre_netlink_parms(struct nlattr *data[],
1760				struct __ip6_tnl_parm *parms)
1761{
1762	memset(parms, 0, sizeof(*parms));
1763
1764	if (!data)
1765		return;
1766
1767	if (data[IFLA_GRE_LINK])
1768		parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1769
1770	if (data[IFLA_GRE_IFLAGS])
1771		gre_flags_to_tnl_flags(parms->i_flags,
1772				       nla_get_be16(data[IFLA_GRE_IFLAGS]));
1773
1774	if (data[IFLA_GRE_OFLAGS])
1775		gre_flags_to_tnl_flags(parms->o_flags,
1776				       nla_get_be16(data[IFLA_GRE_OFLAGS]));
1777
1778	if (data[IFLA_GRE_IKEY])
1779		parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1780
1781	if (data[IFLA_GRE_OKEY])
1782		parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1783
1784	if (data[IFLA_GRE_LOCAL])
1785		parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1786
1787	if (data[IFLA_GRE_REMOTE])
1788		parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1789
1790	if (data[IFLA_GRE_TTL])
1791		parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1792
1793	if (data[IFLA_GRE_ENCAP_LIMIT])
1794		parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1795
1796	if (data[IFLA_GRE_FLOWINFO])
1797		parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1798
1799	if (data[IFLA_GRE_FLAGS])
1800		parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1801
1802	if (data[IFLA_GRE_FWMARK])
1803		parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1804
1805	if (data[IFLA_GRE_COLLECT_METADATA])
1806		parms->collect_md = true;
1807}
1808
1809static int ip6gre_tap_init(struct net_device *dev)
1810{
1811	int ret;
1812
1813	ret = ip6gre_tunnel_init_common(dev);
1814	if (ret)
1815		return ret;
1816
1817	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1818
1819	return 0;
1820}
1821
1822static const struct net_device_ops ip6gre_tap_netdev_ops = {
1823	.ndo_init = ip6gre_tap_init,
1824	.ndo_uninit = ip6gre_tunnel_uninit,
1825	.ndo_start_xmit = ip6gre_tunnel_xmit,
1826	.ndo_set_mac_address = eth_mac_addr,
1827	.ndo_validate_addr = eth_validate_addr,
1828	.ndo_change_mtu = ip6_tnl_change_mtu,
1829	.ndo_get_iflink = ip6_tnl_get_iflink,
1830};
1831
1832static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1833{
1834	int t_hlen;
1835
1836	tunnel->tun_hlen = 8;
1837	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1838		       erspan_hdr_len(tunnel->parms.erspan_ver);
1839
1840	t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1841	tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1842	return t_hlen;
1843}
1844
1845static int ip6erspan_tap_init(struct net_device *dev)
1846{
1847	struct ip6_tnl *tunnel;
1848	int t_hlen;
1849	int ret;
1850
1851	tunnel = netdev_priv(dev);
1852
1853	tunnel->dev = dev;
1854	strscpy(tunnel->parms.name, dev->name);
1855
1856	ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1857	if (ret)
1858		return ret;
1859
1860	ret = gro_cells_init(&tunnel->gro_cells, dev);
1861	if (ret)
1862		goto cleanup_dst_cache_init;
1863
1864	t_hlen = ip6erspan_calc_hlen(tunnel);
1865	dev->mtu = ETH_DATA_LEN - t_hlen;
1866	if (dev->type == ARPHRD_ETHER)
1867		dev->mtu -= ETH_HLEN;
1868	if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1869		dev->mtu -= 8;
1870
1871	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1872	ip6erspan_tnl_link_config(tunnel, 1);
1873
1874	netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1875	netdev_lockdep_set_classes(dev);
1876	return 0;
1877
1878cleanup_dst_cache_init:
1879	dst_cache_destroy(&tunnel->dst_cache);
1880	return ret;
1881}
1882
1883static const struct net_device_ops ip6erspan_netdev_ops = {
1884	.ndo_init =		ip6erspan_tap_init,
1885	.ndo_uninit =		ip6erspan_tunnel_uninit,
1886	.ndo_start_xmit =	ip6erspan_tunnel_xmit,
1887	.ndo_set_mac_address =	eth_mac_addr,
1888	.ndo_validate_addr =	eth_validate_addr,
1889	.ndo_change_mtu =	ip6_tnl_change_mtu,
1890	.ndo_get_iflink =	ip6_tnl_get_iflink,
1891};
1892
1893static void ip6gre_tap_setup(struct net_device *dev)
1894{
1895
1896	ether_setup(dev);
1897
1898	dev->max_mtu = 0;
1899	dev->netdev_ops = &ip6gre_tap_netdev_ops;
1900	dev->needs_free_netdev = true;
1901	dev->priv_destructor = ip6gre_dev_free;
1902
1903	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1904	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1905	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1906	netif_keep_dst(dev);
1907}
1908
1909static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1910				       struct ip_tunnel_encap *ipencap)
1911{
1912	bool ret = false;
1913
1914	memset(ipencap, 0, sizeof(*ipencap));
1915
1916	if (!data)
1917		return ret;
1918
1919	if (data[IFLA_GRE_ENCAP_TYPE]) {
1920		ret = true;
1921		ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1922	}
1923
1924	if (data[IFLA_GRE_ENCAP_FLAGS]) {
1925		ret = true;
1926		ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1927	}
1928
1929	if (data[IFLA_GRE_ENCAP_SPORT]) {
1930		ret = true;
1931		ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1932	}
1933
1934	if (data[IFLA_GRE_ENCAP_DPORT]) {
1935		ret = true;
1936		ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1937	}
1938
1939	return ret;
1940}
1941
1942static int ip6gre_newlink_common(struct net *link_net, struct net_device *dev,
1943				 struct nlattr *tb[], struct nlattr *data[],
1944				 struct netlink_ext_ack *extack)
1945{
1946	struct ip6_tnl *nt;
1947	struct ip_tunnel_encap ipencap;
1948	int err;
1949
1950	nt = netdev_priv(dev);
1951
1952	if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1953		int err = ip6_tnl_encap_setup(nt, &ipencap);
1954
1955		if (err < 0)
1956			return err;
1957	}
1958
1959	if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1960		eth_hw_addr_random(dev);
1961
1962	nt->dev = dev;
1963	nt->net = link_net;
1964
1965	err = register_netdevice(dev);
1966	if (err)
1967		goto out;
1968
1969	if (tb[IFLA_MTU])
1970		ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1971
1972out:
1973	return err;
1974}
1975
1976static int ip6gre_newlink(struct net_device *dev,
1977			  struct rtnl_newlink_params *params,
1978			  struct netlink_ext_ack *extack)
1979{
1980	struct net *net = params->link_net ? : dev_net(dev);
1981	struct ip6_tnl *nt = netdev_priv(dev);
1982	struct nlattr **data = params->data;
1983	struct nlattr **tb = params->tb;
1984	struct ip6gre_net *ign;
1985	int err;
1986
1987	ip6gre_netlink_parms(data, &nt->parms);
1988	ign = net_generic(net, ip6gre_net_id);
1989
1990	if (nt->parms.collect_md) {
1991		if (rtnl_dereference(ign->collect_md_tun))
1992			return -EEXIST;
1993	} else {
1994		if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1995			return -EEXIST;
1996	}
1997
1998	err = ip6gre_newlink_common(net, dev, tb, data, extack);
1999	if (!err) {
2000		ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2001		ip6gre_tunnel_link_md(ign, nt);
2002		ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2003	}
2004	return err;
2005}
2006
2007static struct ip6_tnl *
2008ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2009			 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2010			 struct netlink_ext_ack *extack)
2011{
2012	struct ip6_tnl *t, *nt = netdev_priv(dev);
2013	struct net *net = nt->net;
2014	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2015	struct ip_tunnel_encap ipencap;
2016
2017	if (dev == ign->fb_tunnel_dev)
2018		return ERR_PTR(-EINVAL);
2019
2020	if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2021		int err = ip6_tnl_encap_setup(nt, &ipencap);
2022
2023		if (err < 0)
2024			return ERR_PTR(err);
2025	}
2026
2027	ip6gre_netlink_parms(data, p_p);
2028
2029	t = ip6gre_tunnel_locate(net, p_p, 0);
2030
2031	if (t) {
2032		if (t->dev != dev)
2033			return ERR_PTR(-EEXIST);
2034	} else {
2035		t = nt;
2036	}
2037
2038	return t;
2039}
2040
2041static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2042			     struct nlattr *data[],
2043			     struct netlink_ext_ack *extack)
2044{
2045	struct ip6_tnl *t = netdev_priv(dev);
2046	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2047	struct __ip6_tnl_parm p;
2048
2049	t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2050	if (IS_ERR(t))
2051		return PTR_ERR(t);
2052
2053	ip6gre_tunnel_unlink_md(ign, t);
2054	ip6gre_tunnel_unlink(ign, t);
2055	ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2056	ip6gre_tunnel_link_md(ign, t);
2057	ip6gre_tunnel_link(ign, t);
2058	return 0;
2059}
2060
2061static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2062{
2063	struct net *net = dev_net(dev);
2064	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2065
2066	if (dev != ign->fb_tunnel_dev)
2067		unregister_netdevice_queue(dev, head);
2068}
2069
2070static size_t ip6gre_get_size(const struct net_device *dev)
2071{
2072	return
2073		/* IFLA_GRE_LINK */
2074		nla_total_size(4) +
2075		/* IFLA_GRE_IFLAGS */
2076		nla_total_size(2) +
2077		/* IFLA_GRE_OFLAGS */
2078		nla_total_size(2) +
2079		/* IFLA_GRE_IKEY */
2080		nla_total_size(4) +
2081		/* IFLA_GRE_OKEY */
2082		nla_total_size(4) +
2083		/* IFLA_GRE_LOCAL */
2084		nla_total_size(sizeof(struct in6_addr)) +
2085		/* IFLA_GRE_REMOTE */
2086		nla_total_size(sizeof(struct in6_addr)) +
2087		/* IFLA_GRE_TTL */
2088		nla_total_size(1) +
2089		/* IFLA_GRE_ENCAP_LIMIT */
2090		nla_total_size(1) +
2091		/* IFLA_GRE_FLOWINFO */
2092		nla_total_size(4) +
2093		/* IFLA_GRE_FLAGS */
2094		nla_total_size(4) +
2095		/* IFLA_GRE_ENCAP_TYPE */
2096		nla_total_size(2) +
2097		/* IFLA_GRE_ENCAP_FLAGS */
2098		nla_total_size(2) +
2099		/* IFLA_GRE_ENCAP_SPORT */
2100		nla_total_size(2) +
2101		/* IFLA_GRE_ENCAP_DPORT */
2102		nla_total_size(2) +
2103		/* IFLA_GRE_COLLECT_METADATA */
2104		nla_total_size(0) +
2105		/* IFLA_GRE_FWMARK */
2106		nla_total_size(4) +
2107		/* IFLA_GRE_ERSPAN_INDEX */
2108		nla_total_size(4) +
2109		0;
2110}
2111
2112static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2113{
2114	struct ip6_tnl *t = netdev_priv(dev);
2115	struct __ip6_tnl_parm *p = &t->parms;
2116	IP_TUNNEL_DECLARE_FLAGS(o_flags);
2117
2118	ip_tunnel_flags_copy(o_flags, p->o_flags);
2119
2120	if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2121		if (!p->collect_md)
2122			__set_bit(IP_TUNNEL_KEY_BIT, o_flags);
2123
2124		if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2125			goto nla_put_failure;
2126
2127		if (p->erspan_ver == 1) {
2128			if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2129				goto nla_put_failure;
2130		} else {
2131			if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2132				goto nla_put_failure;
2133			if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2134				goto nla_put_failure;
2135		}
2136	}
2137
2138	if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2139	    nla_put_be16(skb, IFLA_GRE_IFLAGS,
2140			 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2141	    nla_put_be16(skb, IFLA_GRE_OFLAGS,
2142			 gre_tnl_flags_to_gre_flags(o_flags)) ||
2143	    nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2144	    nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2145	    nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2146	    nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2147	    nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2148	    nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2149	    nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2150	    nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2151	    nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2152		goto nla_put_failure;
2153
2154	if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2155			t->encap.type) ||
2156	    nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2157			 t->encap.sport) ||
2158	    nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2159			 t->encap.dport) ||
2160	    nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2161			t->encap.flags))
2162		goto nla_put_failure;
2163
2164	if (p->collect_md) {
2165		if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2166			goto nla_put_failure;
2167	}
2168
2169	return 0;
2170
2171nla_put_failure:
2172	return -EMSGSIZE;
2173}
2174
2175static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2176	[IFLA_GRE_LINK]        = { .type = NLA_U32 },
2177	[IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2178	[IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2179	[IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2180	[IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2181	[IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2182	[IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2183	[IFLA_GRE_TTL]         = { .type = NLA_U8 },
2184	[IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2185	[IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2186	[IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2187	[IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2188	[IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2189	[IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2190	[IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2191	[IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2192	[IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2193	[IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2194	[IFLA_GRE_ERSPAN_VER]	= { .type = NLA_U8 },
2195	[IFLA_GRE_ERSPAN_DIR]	= { .type = NLA_U8 },
2196	[IFLA_GRE_ERSPAN_HWID]	= { .type = NLA_U16 },
2197};
2198
2199static void ip6erspan_tap_setup(struct net_device *dev)
2200{
2201	ether_setup(dev);
2202
2203	dev->max_mtu = 0;
2204	dev->netdev_ops = &ip6erspan_netdev_ops;
2205	dev->needs_free_netdev = true;
2206	dev->priv_destructor = ip6gre_dev_free;
2207
2208	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2209	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2210	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2211	netif_keep_dst(dev);
2212}
2213
2214static int ip6erspan_newlink(struct net_device *dev,
2215			     struct rtnl_newlink_params *params,
2216			     struct netlink_ext_ack *extack)
2217{
2218	struct net *net = params->link_net ? : dev_net(dev);
2219	struct ip6_tnl *nt = netdev_priv(dev);
2220	struct nlattr **data = params->data;
2221	struct nlattr **tb = params->tb;
2222	struct ip6gre_net *ign;
2223	int err;
2224
2225	ip6gre_netlink_parms(data, &nt->parms);
2226	ip6erspan_set_version(data, &nt->parms);
2227	ign = net_generic(net, ip6gre_net_id);
2228
2229	if (nt->parms.collect_md) {
2230		if (rtnl_dereference(ign->collect_md_tun_erspan))
2231			return -EEXIST;
2232	} else {
2233		if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2234			return -EEXIST;
2235	}
2236
2237	err = ip6gre_newlink_common(net, dev, tb, data, extack);
2238	if (!err) {
2239		ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2240		ip6erspan_tunnel_link_md(ign, nt);
2241		ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2242	}
2243	return err;
2244}
2245
2246static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2247{
2248	ip6gre_tnl_link_config_common(t);
2249	ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2250}
2251
2252static int ip6erspan_tnl_change(struct ip6_tnl *t,
2253				const struct __ip6_tnl_parm *p, int set_mtu)
2254{
2255	ip6gre_tnl_copy_tnl_parm(t, p);
2256	ip6erspan_tnl_link_config(t, set_mtu);
2257	return 0;
2258}
2259
2260static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2261				struct nlattr *data[],
2262				struct netlink_ext_ack *extack)
2263{
2264	struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2265	struct __ip6_tnl_parm p;
2266	struct ip6_tnl *t;
2267
2268	t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2269	if (IS_ERR(t))
2270		return PTR_ERR(t);
2271
2272	ip6erspan_set_version(data, &p);
2273	ip6gre_tunnel_unlink_md(ign, t);
2274	ip6gre_tunnel_unlink(ign, t);
2275	ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2276	ip6erspan_tunnel_link_md(ign, t);
2277	ip6gre_tunnel_link(ign, t);
2278	return 0;
2279}
2280
2281static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2282	.kind		= "ip6gre",
2283	.maxtype	= IFLA_GRE_MAX,
2284	.policy		= ip6gre_policy,
2285	.priv_size	= sizeof(struct ip6_tnl),
2286	.setup		= ip6gre_tunnel_setup,
2287	.validate	= ip6gre_tunnel_validate,
2288	.newlink	= ip6gre_newlink,
2289	.changelink	= ip6gre_changelink,
2290	.dellink	= ip6gre_dellink,
2291	.get_size	= ip6gre_get_size,
2292	.fill_info	= ip6gre_fill_info,
2293	.get_link_net	= ip6_tnl_get_link_net,
2294};
2295
2296static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2297	.kind		= "ip6gretap",
2298	.maxtype	= IFLA_GRE_MAX,
2299	.policy		= ip6gre_policy,
2300	.priv_size	= sizeof(struct ip6_tnl),
2301	.setup		= ip6gre_tap_setup,
2302	.validate	= ip6gre_tap_validate,
2303	.newlink	= ip6gre_newlink,
2304	.changelink	= ip6gre_changelink,
2305	.get_size	= ip6gre_get_size,
2306	.fill_info	= ip6gre_fill_info,
2307	.get_link_net	= ip6_tnl_get_link_net,
2308};
2309
2310static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2311	.kind		= "ip6erspan",
2312	.maxtype	= IFLA_GRE_MAX,
2313	.policy		= ip6gre_policy,
2314	.priv_size	= sizeof(struct ip6_tnl),
2315	.setup		= ip6erspan_tap_setup,
2316	.validate	= ip6erspan_tap_validate,
2317	.newlink	= ip6erspan_newlink,
2318	.changelink	= ip6erspan_changelink,
2319	.get_size	= ip6gre_get_size,
2320	.fill_info	= ip6gre_fill_info,
2321	.get_link_net	= ip6_tnl_get_link_net,
2322};
2323
2324/*
2325 *	And now the modules code and kernel interface.
2326 */
2327
2328static int __init ip6gre_init(void)
2329{
2330	int err;
2331
2332	pr_info("GRE over IPv6 tunneling driver\n");
2333
2334	err = register_pernet_device(&ip6gre_net_ops);
2335	if (err < 0)
2336		return err;
2337
2338	err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2339	if (err < 0) {
2340		pr_info("%s: can't add protocol\n", __func__);
2341		goto add_proto_failed;
2342	}
2343
2344	err = rtnl_link_register(&ip6gre_link_ops);
2345	if (err < 0)
2346		goto rtnl_link_failed;
2347
2348	err = rtnl_link_register(&ip6gre_tap_ops);
2349	if (err < 0)
2350		goto tap_ops_failed;
2351
2352	err = rtnl_link_register(&ip6erspan_tap_ops);
2353	if (err < 0)
2354		goto erspan_link_failed;
2355
2356out:
2357	return err;
2358
2359erspan_link_failed:
2360	rtnl_link_unregister(&ip6gre_tap_ops);
2361tap_ops_failed:
2362	rtnl_link_unregister(&ip6gre_link_ops);
2363rtnl_link_failed:
2364	inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365add_proto_failed:
2366	unregister_pernet_device(&ip6gre_net_ops);
2367	goto out;
2368}
2369
2370static void __exit ip6gre_fini(void)
2371{
2372	rtnl_link_unregister(&ip6gre_tap_ops);
2373	rtnl_link_unregister(&ip6gre_link_ops);
2374	rtnl_link_unregister(&ip6erspan_tap_ops);
2375	inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2376	unregister_pernet_device(&ip6gre_net_ops);
2377}
2378
2379module_init(ip6gre_init);
2380module_exit(ip6gre_fini);
2381MODULE_LICENSE("GPL");
2382MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>");
2383MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2384MODULE_ALIAS_RTNL_LINK("ip6gre");
2385MODULE_ALIAS_RTNL_LINK("ip6gretap");
2386MODULE_ALIAS_RTNL_LINK("ip6erspan");
2387MODULE_ALIAS_NETDEV("ip6gre0");