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v6.8
   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/rtnetlink.h>
  47
  48#include <net/ipv6.h>
  49#include <net/ip6_fib.h>
  50#include <net/ip6_route.h>
  51#include <net/ip6_tunnel.h>
  52#include <net/gre.h>
  53#include <net/erspan.h>
  54#include <net/dst_metadata.h>
  55
  56
  57static bool log_ecn_error = true;
  58module_param(log_ecn_error, bool, 0644);
  59MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  60
  61#define IP6_GRE_HASH_SIZE_SHIFT  5
  62#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
  63
  64static unsigned int ip6gre_net_id __read_mostly;
  65struct ip6gre_net {
  66	struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
  67
  68	struct ip6_tnl __rcu *collect_md_tun;
  69	struct ip6_tnl __rcu *collect_md_tun_erspan;
  70	struct net_device *fb_tunnel_dev;
  71};
  72
  73static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  74static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  75static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  76static int ip6gre_tunnel_init(struct net_device *dev);
  77static void ip6gre_tunnel_setup(struct net_device *dev);
  78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  80static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  81
  82/* Tunnel hash table */
  83
  84/*
  85   4 hash tables:
  86
  87   3: (remote,local)
  88   2: (remote,*)
  89   1: (*,local)
  90   0: (*,*)
  91
  92   We require exact key match i.e. if a key is present in packet
  93   it will match only tunnel with the same key; if it is not present,
  94   it will match only keyless tunnel.
  95
  96   All keysless packets, if not matched configured keyless tunnels
  97   will match fallback tunnel.
  98 */
  99
 100#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 101static u32 HASH_ADDR(const struct in6_addr *addr)
 102{
 103	u32 hash = ipv6_addr_hash(addr);
 104
 105	return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 106}
 107
 108#define tunnels_r_l	tunnels[3]
 109#define tunnels_r	tunnels[2]
 110#define tunnels_l	tunnels[1]
 111#define tunnels_wc	tunnels[0]
 112
 113/* Given src, dst and key, find appropriate for input tunnel. */
 114
 115static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 116		const struct in6_addr *remote, const struct in6_addr *local,
 117		__be32 key, __be16 gre_proto)
 118{
 119	struct net *net = dev_net(dev);
 120	int link = dev->ifindex;
 121	unsigned int h0 = HASH_ADDR(remote);
 122	unsigned int h1 = HASH_KEY(key);
 123	struct ip6_tnl *t, *cand = NULL;
 124	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 125	int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 126			gre_proto == htons(ETH_P_ERSPAN) ||
 127			gre_proto == htons(ETH_P_ERSPAN2)) ?
 128		       ARPHRD_ETHER : ARPHRD_IP6GRE;
 129	int score, cand_score = 4;
 130	struct net_device *ndev;
 131
 132	for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 133		if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 134		    !ipv6_addr_equal(remote, &t->parms.raddr) ||
 135		    key != t->parms.i_key ||
 136		    !(t->dev->flags & IFF_UP))
 137			continue;
 138
 139		if (t->dev->type != ARPHRD_IP6GRE &&
 140		    t->dev->type != dev_type)
 141			continue;
 142
 143		score = 0;
 144		if (t->parms.link != link)
 145			score |= 1;
 146		if (t->dev->type != dev_type)
 147			score |= 2;
 148		if (score == 0)
 149			return t;
 150
 151		if (score < cand_score) {
 152			cand = t;
 153			cand_score = score;
 154		}
 155	}
 156
 157	for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 158		if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 159		    key != t->parms.i_key ||
 160		    !(t->dev->flags & IFF_UP))
 161			continue;
 162
 163		if (t->dev->type != ARPHRD_IP6GRE &&
 164		    t->dev->type != dev_type)
 165			continue;
 166
 167		score = 0;
 168		if (t->parms.link != link)
 169			score |= 1;
 170		if (t->dev->type != dev_type)
 171			score |= 2;
 172		if (score == 0)
 173			return t;
 174
 175		if (score < cand_score) {
 176			cand = t;
 177			cand_score = score;
 178		}
 179	}
 180
 181	for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 182		if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 183			  (!ipv6_addr_equal(local, &t->parms.raddr) ||
 184				 !ipv6_addr_is_multicast(local))) ||
 185		    key != t->parms.i_key ||
 186		    !(t->dev->flags & IFF_UP))
 187			continue;
 188
 189		if (t->dev->type != ARPHRD_IP6GRE &&
 190		    t->dev->type != dev_type)
 191			continue;
 192
 193		score = 0;
 194		if (t->parms.link != link)
 195			score |= 1;
 196		if (t->dev->type != dev_type)
 197			score |= 2;
 198		if (score == 0)
 199			return t;
 200
 201		if (score < cand_score) {
 202			cand = t;
 203			cand_score = score;
 204		}
 205	}
 206
 207	for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 208		if (t->parms.i_key != key ||
 209		    !(t->dev->flags & IFF_UP))
 210			continue;
 211
 212		if (t->dev->type != ARPHRD_IP6GRE &&
 213		    t->dev->type != dev_type)
 214			continue;
 215
 216		score = 0;
 217		if (t->parms.link != link)
 218			score |= 1;
 219		if (t->dev->type != dev_type)
 220			score |= 2;
 221		if (score == 0)
 222			return t;
 223
 224		if (score < cand_score) {
 225			cand = t;
 226			cand_score = score;
 227		}
 228	}
 229
 230	if (cand)
 231		return cand;
 232
 233	if (gre_proto == htons(ETH_P_ERSPAN) ||
 234	    gre_proto == htons(ETH_P_ERSPAN2))
 235		t = rcu_dereference(ign->collect_md_tun_erspan);
 236	else
 237		t = rcu_dereference(ign->collect_md_tun);
 238
 239	if (t && t->dev->flags & IFF_UP)
 240		return t;
 241
 242	ndev = READ_ONCE(ign->fb_tunnel_dev);
 243	if (ndev && ndev->flags & IFF_UP)
 244		return netdev_priv(ndev);
 245
 246	return NULL;
 247}
 248
 249static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 250		const struct __ip6_tnl_parm *p)
 251{
 252	const struct in6_addr *remote = &p->raddr;
 253	const struct in6_addr *local = &p->laddr;
 254	unsigned int h = HASH_KEY(p->i_key);
 255	int prio = 0;
 256
 257	if (!ipv6_addr_any(local))
 258		prio |= 1;
 259	if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 260		prio |= 2;
 261		h ^= HASH_ADDR(remote);
 262	}
 263
 264	return &ign->tunnels[prio][h];
 265}
 266
 267static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 268{
 269	if (t->parms.collect_md)
 270		rcu_assign_pointer(ign->collect_md_tun, t);
 271}
 272
 273static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 274{
 275	if (t->parms.collect_md)
 276		rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 277}
 278
 279static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 280{
 281	if (t->parms.collect_md)
 282		rcu_assign_pointer(ign->collect_md_tun, NULL);
 283}
 284
 285static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 286				       struct ip6_tnl *t)
 287{
 288	if (t->parms.collect_md)
 289		rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 290}
 291
 292static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 293		const struct ip6_tnl *t)
 294{
 295	return __ip6gre_bucket(ign, &t->parms);
 296}
 297
 298static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 299{
 300	struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 301
 302	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 303	rcu_assign_pointer(*tp, t);
 304}
 305
 306static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 307{
 308	struct ip6_tnl __rcu **tp;
 309	struct ip6_tnl *iter;
 310
 311	for (tp = ip6gre_bucket(ign, t);
 312	     (iter = rtnl_dereference(*tp)) != NULL;
 313	     tp = &iter->next) {
 314		if (t == iter) {
 315			rcu_assign_pointer(*tp, t->next);
 316			break;
 317		}
 318	}
 319}
 320
 321static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 322					   const struct __ip6_tnl_parm *parms,
 323					   int type)
 324{
 325	const struct in6_addr *remote = &parms->raddr;
 326	const struct in6_addr *local = &parms->laddr;
 327	__be32 key = parms->i_key;
 328	int link = parms->link;
 329	struct ip6_tnl *t;
 330	struct ip6_tnl __rcu **tp;
 331	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 332
 333	for (tp = __ip6gre_bucket(ign, parms);
 334	     (t = rtnl_dereference(*tp)) != NULL;
 335	     tp = &t->next)
 336		if (ipv6_addr_equal(local, &t->parms.laddr) &&
 337		    ipv6_addr_equal(remote, &t->parms.raddr) &&
 338		    key == t->parms.i_key &&
 339		    link == t->parms.link &&
 340		    type == t->dev->type)
 341			break;
 342
 343	return t;
 344}
 345
 346static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 347		const struct __ip6_tnl_parm *parms, int create)
 348{
 349	struct ip6_tnl *t, *nt;
 350	struct net_device *dev;
 351	char name[IFNAMSIZ];
 352	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 353
 354	t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 355	if (t && create)
 356		return NULL;
 357	if (t || !create)
 358		return t;
 359
 360	if (parms->name[0]) {
 361		if (!dev_valid_name(parms->name))
 362			return NULL;
 363		strscpy(name, parms->name, IFNAMSIZ);
 364	} else {
 365		strcpy(name, "ip6gre%d");
 366	}
 367	dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 368			   ip6gre_tunnel_setup);
 369	if (!dev)
 370		return NULL;
 371
 372	dev_net_set(dev, net);
 373
 374	nt = netdev_priv(dev);
 375	nt->parms = *parms;
 376	dev->rtnl_link_ops = &ip6gre_link_ops;
 377
 378	nt->dev = dev;
 379	nt->net = dev_net(dev);
 380
 381	if (register_netdevice(dev) < 0)
 382		goto failed_free;
 383
 384	ip6gre_tnl_link_config(nt, 1);
 385	ip6gre_tunnel_link(ign, nt);
 386	return nt;
 387
 388failed_free:
 389	free_netdev(dev);
 390	return NULL;
 391}
 392
 393static void ip6erspan_tunnel_uninit(struct net_device *dev)
 394{
 395	struct ip6_tnl *t = netdev_priv(dev);
 396	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 397
 398	ip6erspan_tunnel_unlink_md(ign, t);
 399	ip6gre_tunnel_unlink(ign, t);
 400	dst_cache_reset(&t->dst_cache);
 401	netdev_put(dev, &t->dev_tracker);
 402}
 403
 404static void ip6gre_tunnel_uninit(struct net_device *dev)
 405{
 406	struct ip6_tnl *t = netdev_priv(dev);
 407	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 408
 409	ip6gre_tunnel_unlink_md(ign, t);
 410	ip6gre_tunnel_unlink(ign, t);
 411	if (ign->fb_tunnel_dev == dev)
 412		WRITE_ONCE(ign->fb_tunnel_dev, NULL);
 413	dst_cache_reset(&t->dst_cache);
 414	netdev_put(dev, &t->dev_tracker);
 415}
 416
 417
 418static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 419		       u8 type, u8 code, int offset, __be32 info)
 420{
 421	struct net *net = dev_net(skb->dev);
 422	const struct ipv6hdr *ipv6h;
 423	struct tnl_ptk_info tpi;
 424	struct ip6_tnl *t;
 425
 426	if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
 427			     offset) < 0)
 428		return -EINVAL;
 429
 430	ipv6h = (const struct ipv6hdr *)skb->data;
 431	t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 432				 tpi.key, tpi.proto);
 433	if (!t)
 434		return -ENOENT;
 435
 436	switch (type) {
 437	case ICMPV6_DEST_UNREACH:
 438		net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 439				    t->parms.name);
 440		if (code != ICMPV6_PORT_UNREACH)
 441			break;
 442		return 0;
 443	case ICMPV6_TIME_EXCEED:
 444		if (code == ICMPV6_EXC_HOPLIMIT) {
 445			net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 446					    t->parms.name);
 447			break;
 448		}
 449		return 0;
 450	case ICMPV6_PARAMPROB: {
 451		struct ipv6_tlv_tnl_enc_lim *tel;
 452		__u32 teli;
 453
 454		teli = 0;
 455		if (code == ICMPV6_HDR_FIELD)
 456			teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 457
 458		if (teli && teli == be32_to_cpu(info) - 2) {
 459			tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 460			if (tel->encap_limit == 0) {
 461				net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 462						    t->parms.name);
 463			}
 464		} else {
 465			net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 466					    t->parms.name);
 467		}
 468		return 0;
 469	}
 470	case ICMPV6_PKT_TOOBIG:
 471		ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 472		return 0;
 473	case NDISC_REDIRECT:
 474		ip6_redirect(skb, net, skb->dev->ifindex, 0,
 475			     sock_net_uid(net, NULL));
 476		return 0;
 477	}
 478
 479	if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 480		t->err_count++;
 481	else
 482		t->err_count = 1;
 483	t->err_time = jiffies;
 484
 485	return 0;
 486}
 487
 488static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 489{
 490	const struct ipv6hdr *ipv6h;
 491	struct ip6_tnl *tunnel;
 492
 493	ipv6h = ipv6_hdr(skb);
 494	tunnel = ip6gre_tunnel_lookup(skb->dev,
 495				      &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 496				      tpi->proto);
 497	if (tunnel) {
 498		if (tunnel->parms.collect_md) {
 
 499			struct metadata_dst *tun_dst;
 500			__be64 tun_id;
 501			__be16 flags;
 502
 503			flags = tpi->flags;
 504			tun_id = key32_to_tunnel_id(tpi->key);
 505
 506			tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 507			if (!tun_dst)
 508				return PACKET_REJECT;
 509
 510			ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 511		} else {
 512			ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 513		}
 514
 515		return PACKET_RCVD;
 516	}
 517
 518	return PACKET_REJECT;
 519}
 520
 521static int ip6erspan_rcv(struct sk_buff *skb,
 522			 struct tnl_ptk_info *tpi,
 523			 int gre_hdr_len)
 524{
 525	struct erspan_base_hdr *ershdr;
 526	const struct ipv6hdr *ipv6h;
 527	struct erspan_md2 *md2;
 528	struct ip6_tnl *tunnel;
 529	u8 ver;
 530
 
 
 
 531	ipv6h = ipv6_hdr(skb);
 532	ershdr = (struct erspan_base_hdr *)skb->data;
 533	ver = ershdr->ver;
 534
 535	tunnel = ip6gre_tunnel_lookup(skb->dev,
 536				      &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 537				      tpi->proto);
 538	if (tunnel) {
 539		int len = erspan_hdr_len(ver);
 540
 541		if (unlikely(!pskb_may_pull(skb, len)))
 542			return PACKET_REJECT;
 543
 544		if (__iptunnel_pull_header(skb, len,
 545					   htons(ETH_P_TEB),
 546					   false, false) < 0)
 547			return PACKET_REJECT;
 548
 549		if (tunnel->parms.collect_md) {
 550			struct erspan_metadata *pkt_md, *md;
 
 551			struct metadata_dst *tun_dst;
 552			struct ip_tunnel_info *info;
 553			unsigned char *gh;
 554			__be64 tun_id;
 555			__be16 flags;
 556
 557			tpi->flags |= TUNNEL_KEY;
 558			flags = tpi->flags;
 559			tun_id = key32_to_tunnel_id(tpi->key);
 560
 561			tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 562						  sizeof(*md));
 563			if (!tun_dst)
 564				return PACKET_REJECT;
 565
 566			/* skb can be uncloned in __iptunnel_pull_header, so
 567			 * old pkt_md is no longer valid and we need to reset
 568			 * it
 569			 */
 570			gh = skb_network_header(skb) +
 571			     skb_network_header_len(skb);
 572			pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 573							    sizeof(*ershdr));
 574			info = &tun_dst->u.tun_info;
 575			md = ip_tunnel_info_opts(info);
 576			md->version = ver;
 577			md2 = &md->u.md2;
 578			memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 579						       ERSPAN_V2_MDSIZE);
 580			info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 
 581			info->options_len = sizeof(*md);
 582
 583			ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 584
 585		} else {
 586			ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 587		}
 588
 589		return PACKET_RCVD;
 590	}
 591
 592	return PACKET_REJECT;
 593}
 594
 595static int gre_rcv(struct sk_buff *skb)
 596{
 597	struct tnl_ptk_info tpi;
 598	bool csum_err = false;
 599	int hdr_len;
 600
 601	hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 602	if (hdr_len < 0)
 603		goto drop;
 604
 605	if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 606		goto drop;
 607
 608	if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 609		     tpi.proto == htons(ETH_P_ERSPAN2))) {
 610		if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 611			return 0;
 612		goto out;
 613	}
 614
 615	if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 616		return 0;
 617
 618out:
 619	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 620drop:
 621	kfree_skb(skb);
 622	return 0;
 623}
 624
 625static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 626{
 627	return iptunnel_handle_offloads(skb,
 628					csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 629}
 630
 631static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 632				     struct net_device *dev,
 633				     struct flowi6 *fl6, __u8 *dsfield,
 634				     int *encap_limit)
 635{
 636	const struct iphdr *iph = ip_hdr(skb);
 637	struct ip6_tnl *t = netdev_priv(dev);
 638
 639	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 640		*encap_limit = t->parms.encap_limit;
 641
 642	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 643
 644	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 645		*dsfield = ipv4_get_dsfield(iph);
 646	else
 647		*dsfield = ip6_tclass(t->parms.flowinfo);
 648
 649	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 650		fl6->flowi6_mark = skb->mark;
 651	else
 652		fl6->flowi6_mark = t->parms.fwmark;
 653
 654	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 655}
 656
 657static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 658				    struct net_device *dev,
 659				    struct flowi6 *fl6, __u8 *dsfield,
 660				    int *encap_limit)
 661{
 662	struct ipv6hdr *ipv6h;
 663	struct ip6_tnl *t = netdev_priv(dev);
 664	__u16 offset;
 665
 666	offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 667	/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 668	ipv6h = ipv6_hdr(skb);
 669
 670	if (offset > 0) {
 671		struct ipv6_tlv_tnl_enc_lim *tel;
 672
 673		tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 674		if (tel->encap_limit == 0) {
 675			icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
 676					ICMPV6_HDR_FIELD, offset + 2);
 677			return -1;
 678		}
 679		*encap_limit = tel->encap_limit - 1;
 680	} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 681		*encap_limit = t->parms.encap_limit;
 682	}
 683
 684	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 685
 686	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 687		*dsfield = ipv6_get_dsfield(ipv6h);
 688	else
 689		*dsfield = ip6_tclass(t->parms.flowinfo);
 690
 691	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 692		fl6->flowlabel |= ip6_flowlabel(ipv6h);
 693
 694	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 695		fl6->flowi6_mark = skb->mark;
 696	else
 697		fl6->flowi6_mark = t->parms.fwmark;
 698
 699	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 700
 701	return 0;
 702}
 703
 704static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
 705				     struct net_device *dev,
 706				     struct flowi6 *fl6, __u8 *dsfield,
 707				     int *encap_limit)
 708{
 709	struct ip6_tnl *t = netdev_priv(dev);
 710
 711	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 712		*encap_limit = t->parms.encap_limit;
 713
 714	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 715
 716	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 717		*dsfield = 0;
 718	else
 719		*dsfield = ip6_tclass(t->parms.flowinfo);
 720
 721	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 722		fl6->flowi6_mark = skb->mark;
 723	else
 724		fl6->flowi6_mark = t->parms.fwmark;
 725
 726	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 727
 728	return 0;
 729}
 730
 731static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
 732{
 733	struct ip_tunnel_info *tun_info;
 734
 735	tun_info = skb_tunnel_info(skb);
 736	if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
 737		return ERR_PTR(-EINVAL);
 738
 739	return tun_info;
 740}
 741
 742static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 743			       struct net_device *dev, __u8 dsfield,
 744			       struct flowi6 *fl6, int encap_limit,
 745			       __u32 *pmtu, __be16 proto)
 746{
 747	struct ip6_tnl *tunnel = netdev_priv(dev);
 
 748	__be16 protocol;
 749	__be16 flags;
 750
 751	if (dev->type == ARPHRD_ETHER)
 752		IPCB(skb)->flags = 0;
 753
 754	if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 755		fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 756	else
 757		fl6->daddr = tunnel->parms.raddr;
 758
 759	/* Push GRE header. */
 760	protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 761
 762	if (tunnel->parms.collect_md) {
 763		struct ip_tunnel_info *tun_info;
 764		const struct ip_tunnel_key *key;
 765		int tun_hlen;
 766
 767		tun_info = skb_tunnel_info_txcheck(skb);
 768		if (IS_ERR(tun_info) ||
 769		    unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 770			return -EINVAL;
 771
 772		key = &tun_info->key;
 773		memset(fl6, 0, sizeof(*fl6));
 774		fl6->flowi6_proto = IPPROTO_GRE;
 775		fl6->daddr = key->u.ipv6.dst;
 776		fl6->flowlabel = key->label;
 777		fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 778		fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
 779
 780		dsfield = key->tos;
 781		flags = key->tun_flags &
 782			(TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 
 
 
 783		tun_hlen = gre_calc_hlen(flags);
 784
 785		if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
 786			return -ENOMEM;
 787
 788		gre_build_header(skb, tun_hlen,
 789				 flags, protocol,
 790				 tunnel_id_to_key32(tun_info->key.tun_id),
 791				 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 792						      : 0);
 
 793
 794	} else {
 795		if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 796			return -ENOMEM;
 797
 798		flags = tunnel->parms.o_flags;
 799
 800		gre_build_header(skb, tunnel->tun_hlen, flags,
 801				 protocol, tunnel->parms.o_key,
 802				 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 803						      : 0);
 
 804	}
 805
 806	return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 807			    NEXTHDR_GRE);
 808}
 809
 810static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 811{
 812	struct ip6_tnl *t = netdev_priv(dev);
 813	int encap_limit = -1;
 814	struct flowi6 fl6;
 815	__u8 dsfield = 0;
 816	__u32 mtu;
 817	int err;
 818
 819	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 820
 821	if (!t->parms.collect_md)
 822		prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 823					 &dsfield, &encap_limit);
 824
 825	err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 
 826	if (err)
 827		return -1;
 828
 829	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 830			  skb->protocol);
 831	if (err != 0) {
 832		/* XXX: send ICMP error even if DF is not set. */
 833		if (err == -EMSGSIZE)
 834			icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 835				      htonl(mtu));
 836		return -1;
 837	}
 838
 839	return 0;
 840}
 841
 842static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 843{
 844	struct ip6_tnl *t = netdev_priv(dev);
 845	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 846	int encap_limit = -1;
 847	struct flowi6 fl6;
 848	__u8 dsfield = 0;
 849	__u32 mtu;
 850	int err;
 851
 852	if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 853		return -1;
 854
 855	if (!t->parms.collect_md &&
 856	    prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 857		return -1;
 858
 859	if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 
 860		return -1;
 861
 862	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 863			  &mtu, skb->protocol);
 864	if (err != 0) {
 865		if (err == -EMSGSIZE)
 866			icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 867		return -1;
 868	}
 869
 870	return 0;
 871}
 872
 873static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 874{
 875	struct ip6_tnl *t = netdev_priv(dev);
 876	int encap_limit = -1;
 877	struct flowi6 fl6;
 878	__u8 dsfield = 0;
 879	__u32 mtu;
 880	int err;
 881
 882	if (!t->parms.collect_md &&
 883	    prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
 884		return -1;
 885
 886	err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 
 887	if (err)
 888		return err;
 889	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
 890
 891	return err;
 892}
 893
 894static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 895	struct net_device *dev)
 896{
 897	struct ip6_tnl *t = netdev_priv(dev);
 898	__be16 payload_protocol;
 899	int ret;
 900
 901	if (!pskb_inet_may_pull(skb))
 902		goto tx_err;
 903
 904	if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 905		goto tx_err;
 906
 907	payload_protocol = skb_protocol(skb, true);
 908	switch (payload_protocol) {
 909	case htons(ETH_P_IP):
 910		ret = ip6gre_xmit_ipv4(skb, dev);
 911		break;
 912	case htons(ETH_P_IPV6):
 913		ret = ip6gre_xmit_ipv6(skb, dev);
 914		break;
 915	default:
 916		ret = ip6gre_xmit_other(skb, dev);
 917		break;
 918	}
 919
 920	if (ret < 0)
 921		goto tx_err;
 922
 923	return NETDEV_TX_OK;
 924
 925tx_err:
 926	if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
 927		DEV_STATS_INC(dev, tx_errors);
 928	DEV_STATS_INC(dev, tx_dropped);
 929	kfree_skb(skb);
 930	return NETDEV_TX_OK;
 931}
 932
 933static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 934					 struct net_device *dev)
 935{
 936	struct ip_tunnel_info *tun_info = NULL;
 937	struct ip6_tnl *t = netdev_priv(dev);
 938	struct dst_entry *dst = skb_dst(skb);
 
 939	bool truncate = false;
 940	int encap_limit = -1;
 941	__u8 dsfield = false;
 942	struct flowi6 fl6;
 943	int err = -EINVAL;
 944	__be16 proto;
 945	__u32 mtu;
 946	int nhoff;
 947
 948	if (!pskb_inet_may_pull(skb))
 949		goto tx_err;
 950
 951	if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 952		goto tx_err;
 953
 954	if (gre_handle_offloads(skb, false))
 955		goto tx_err;
 956
 957	if (skb->len > dev->mtu + dev->hard_header_len) {
 958		if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
 959			goto tx_err;
 960		truncate = true;
 961	}
 962
 963	nhoff = skb_network_offset(skb);
 964	if (skb->protocol == htons(ETH_P_IP) &&
 965	    (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 966		truncate = true;
 967
 968	if (skb->protocol == htons(ETH_P_IPV6)) {
 969		int thoff;
 970
 971		if (skb_transport_header_was_set(skb))
 972			thoff = skb_transport_offset(skb);
 973		else
 974			thoff = nhoff + sizeof(struct ipv6hdr);
 975		if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
 976			truncate = true;
 977	}
 978
 979	if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 980		goto tx_err;
 981
 982	t->parms.o_flags &= ~TUNNEL_KEY;
 983	IPCB(skb)->flags = 0;
 984
 985	/* For collect_md mode, derive fl6 from the tunnel key,
 986	 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 987	 */
 988	if (t->parms.collect_md) {
 989		const struct ip_tunnel_key *key;
 990		struct erspan_metadata *md;
 991		__be32 tun_id;
 992
 993		tun_info = skb_tunnel_info_txcheck(skb);
 994		if (IS_ERR(tun_info) ||
 995		    unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 996			goto tx_err;
 997
 998		key = &tun_info->key;
 999		memset(&fl6, 0, sizeof(fl6));
1000		fl6.flowi6_proto = IPPROTO_GRE;
1001		fl6.daddr = key->u.ipv6.dst;
1002		fl6.flowlabel = key->label;
1003		fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1004		fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1005
1006		dsfield = key->tos;
1007		if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
 
1008			goto tx_err;
1009		if (tun_info->options_len < sizeof(*md))
1010			goto tx_err;
1011		md = ip_tunnel_info_opts(tun_info);
1012
1013		tun_id = tunnel_id_to_key32(key->tun_id);
1014		if (md->version == 1) {
1015			erspan_build_header(skb,
1016					    ntohl(tun_id),
1017					    ntohl(md->u.index), truncate,
1018					    false);
1019			proto = htons(ETH_P_ERSPAN);
1020		} else if (md->version == 2) {
1021			erspan_build_header_v2(skb,
1022					       ntohl(tun_id),
1023					       md->u.md2.dir,
1024					       get_hwid(&md->u.md2),
1025					       truncate, false);
1026			proto = htons(ETH_P_ERSPAN2);
1027		} else {
1028			goto tx_err;
1029		}
1030	} else {
1031		switch (skb->protocol) {
1032		case htons(ETH_P_IP):
1033			memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1034			prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1035						 &dsfield, &encap_limit);
1036			break;
1037		case htons(ETH_P_IPV6):
1038			if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1039				goto tx_err;
1040			if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1041						     &dsfield, &encap_limit))
1042				goto tx_err;
1043			break;
1044		default:
1045			memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1046			break;
1047		}
1048
1049		if (t->parms.erspan_ver == 1) {
1050			erspan_build_header(skb, ntohl(t->parms.o_key),
1051					    t->parms.index,
1052					    truncate, false);
1053			proto = htons(ETH_P_ERSPAN);
1054		} else if (t->parms.erspan_ver == 2) {
1055			erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1056					       t->parms.dir,
1057					       t->parms.hwid,
1058					       truncate, false);
1059			proto = htons(ETH_P_ERSPAN2);
1060		} else {
1061			goto tx_err;
1062		}
1063
1064		fl6.daddr = t->parms.raddr;
1065	}
1066
1067	/* Push GRE header. */
1068	gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
 
 
1069
1070	/* TooBig packet may have updated dst->dev's mtu */
1071	if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1072		dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1073
1074	err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1075			   NEXTHDR_GRE);
1076	if (err != 0) {
1077		/* XXX: send ICMP error even if DF is not set. */
1078		if (err == -EMSGSIZE) {
1079			if (skb->protocol == htons(ETH_P_IP))
1080				icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1081					      ICMP_FRAG_NEEDED, htonl(mtu));
1082			else
1083				icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1084		}
1085
1086		goto tx_err;
1087	}
1088	return NETDEV_TX_OK;
1089
1090tx_err:
1091	if (!IS_ERR(tun_info))
1092		DEV_STATS_INC(dev, tx_errors);
1093	DEV_STATS_INC(dev, tx_dropped);
1094	kfree_skb(skb);
1095	return NETDEV_TX_OK;
1096}
1097
1098static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1099{
1100	struct net_device *dev = t->dev;
1101	struct __ip6_tnl_parm *p = &t->parms;
1102	struct flowi6 *fl6 = &t->fl.u.ip6;
1103
1104	if (dev->type != ARPHRD_ETHER) {
1105		__dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1106		memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1107	}
1108
1109	/* Set up flowi template */
1110	fl6->saddr = p->laddr;
1111	fl6->daddr = p->raddr;
1112	fl6->flowi6_oif = p->link;
1113	fl6->flowlabel = 0;
1114	fl6->flowi6_proto = IPPROTO_GRE;
1115	fl6->fl6_gre_key = t->parms.o_key;
1116
1117	if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1118		fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1119	if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1120		fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1121
1122	p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1123	p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1124
1125	if (p->flags&IP6_TNL_F_CAP_XMIT &&
1126			p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1127		dev->flags |= IFF_POINTOPOINT;
1128	else
1129		dev->flags &= ~IFF_POINTOPOINT;
1130}
1131
1132static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1133					 int t_hlen)
1134{
1135	const struct __ip6_tnl_parm *p = &t->parms;
1136	struct net_device *dev = t->dev;
1137
1138	if (p->flags & IP6_TNL_F_CAP_XMIT) {
1139		int strict = (ipv6_addr_type(&p->raddr) &
1140			      (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1141
1142		struct rt6_info *rt = rt6_lookup(t->net,
1143						 &p->raddr, &p->laddr,
1144						 p->link, NULL, strict);
1145
1146		if (!rt)
1147			return;
1148
1149		if (rt->dst.dev) {
1150			unsigned short dst_len = rt->dst.dev->hard_header_len +
1151						 t_hlen;
1152
1153			if (t->dev->header_ops)
1154				dev->hard_header_len = dst_len;
1155			else
1156				dev->needed_headroom = dst_len;
1157
1158			if (set_mtu) {
1159				int mtu = rt->dst.dev->mtu - t_hlen;
1160
1161				if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1162					mtu -= 8;
1163				if (dev->type == ARPHRD_ETHER)
1164					mtu -= ETH_HLEN;
1165
1166				if (mtu < IPV6_MIN_MTU)
1167					mtu = IPV6_MIN_MTU;
1168				WRITE_ONCE(dev->mtu, mtu);
1169			}
1170		}
1171		ip6_rt_put(rt);
1172	}
1173}
1174
1175static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1176{
1177	int t_hlen;
1178
1179	tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1180	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1181
1182	t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1183
1184	if (tunnel->dev->header_ops)
1185		tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1186	else
1187		tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1188
1189	return t_hlen;
1190}
1191
1192static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1193{
1194	ip6gre_tnl_link_config_common(t);
1195	ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1196}
1197
1198static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1199				     const struct __ip6_tnl_parm *p)
1200{
1201	t->parms.laddr = p->laddr;
1202	t->parms.raddr = p->raddr;
1203	t->parms.flags = p->flags;
1204	t->parms.hop_limit = p->hop_limit;
1205	t->parms.encap_limit = p->encap_limit;
1206	t->parms.flowinfo = p->flowinfo;
1207	t->parms.link = p->link;
1208	t->parms.proto = p->proto;
1209	t->parms.i_key = p->i_key;
1210	t->parms.o_key = p->o_key;
1211	t->parms.i_flags = p->i_flags;
1212	t->parms.o_flags = p->o_flags;
1213	t->parms.fwmark = p->fwmark;
1214	t->parms.erspan_ver = p->erspan_ver;
1215	t->parms.index = p->index;
1216	t->parms.dir = p->dir;
1217	t->parms.hwid = p->hwid;
1218	dst_cache_reset(&t->dst_cache);
1219}
1220
1221static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1222			     int set_mtu)
1223{
1224	ip6gre_tnl_copy_tnl_parm(t, p);
1225	ip6gre_tnl_link_config(t, set_mtu);
1226	return 0;
1227}
1228
1229static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1230	const struct ip6_tnl_parm2 *u)
1231{
1232	p->laddr = u->laddr;
1233	p->raddr = u->raddr;
1234	p->flags = u->flags;
1235	p->hop_limit = u->hop_limit;
1236	p->encap_limit = u->encap_limit;
1237	p->flowinfo = u->flowinfo;
1238	p->link = u->link;
1239	p->i_key = u->i_key;
1240	p->o_key = u->o_key;
1241	p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1242	p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1243	memcpy(p->name, u->name, sizeof(u->name));
1244}
1245
1246static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1247	const struct __ip6_tnl_parm *p)
1248{
1249	u->proto = IPPROTO_GRE;
1250	u->laddr = p->laddr;
1251	u->raddr = p->raddr;
1252	u->flags = p->flags;
1253	u->hop_limit = p->hop_limit;
1254	u->encap_limit = p->encap_limit;
1255	u->flowinfo = p->flowinfo;
1256	u->link = p->link;
1257	u->i_key = p->i_key;
1258	u->o_key = p->o_key;
1259	u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1260	u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1261	memcpy(u->name, p->name, sizeof(u->name));
1262}
1263
1264static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1265					struct ifreq *ifr, void __user *data,
1266					int cmd)
1267{
1268	int err = 0;
1269	struct ip6_tnl_parm2 p;
1270	struct __ip6_tnl_parm p1;
1271	struct ip6_tnl *t = netdev_priv(dev);
1272	struct net *net = t->net;
1273	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1274
1275	memset(&p1, 0, sizeof(p1));
1276
1277	switch (cmd) {
1278	case SIOCGETTUNNEL:
1279		if (dev == ign->fb_tunnel_dev) {
1280			if (copy_from_user(&p, data, sizeof(p))) {
1281				err = -EFAULT;
1282				break;
1283			}
1284			ip6gre_tnl_parm_from_user(&p1, &p);
1285			t = ip6gre_tunnel_locate(net, &p1, 0);
1286			if (!t)
1287				t = netdev_priv(dev);
1288		}
1289		memset(&p, 0, sizeof(p));
1290		ip6gre_tnl_parm_to_user(&p, &t->parms);
1291		if (copy_to_user(data, &p, sizeof(p)))
1292			err = -EFAULT;
1293		break;
1294
1295	case SIOCADDTUNNEL:
1296	case SIOCCHGTUNNEL:
1297		err = -EPERM;
1298		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1299			goto done;
1300
1301		err = -EFAULT;
1302		if (copy_from_user(&p, data, sizeof(p)))
1303			goto done;
1304
1305		err = -EINVAL;
1306		if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1307			goto done;
1308
1309		if (!(p.i_flags&GRE_KEY))
1310			p.i_key = 0;
1311		if (!(p.o_flags&GRE_KEY))
1312			p.o_key = 0;
1313
1314		ip6gre_tnl_parm_from_user(&p1, &p);
1315		t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1316
1317		if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1318			if (t) {
1319				if (t->dev != dev) {
1320					err = -EEXIST;
1321					break;
1322				}
1323			} else {
1324				t = netdev_priv(dev);
1325
1326				ip6gre_tunnel_unlink(ign, t);
1327				synchronize_net();
1328				ip6gre_tnl_change(t, &p1, 1);
1329				ip6gre_tunnel_link(ign, t);
1330				netdev_state_change(dev);
1331			}
1332		}
1333
1334		if (t) {
1335			err = 0;
1336
1337			memset(&p, 0, sizeof(p));
1338			ip6gre_tnl_parm_to_user(&p, &t->parms);
1339			if (copy_to_user(data, &p, sizeof(p)))
1340				err = -EFAULT;
1341		} else
1342			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1343		break;
1344
1345	case SIOCDELTUNNEL:
1346		err = -EPERM;
1347		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1348			goto done;
1349
1350		if (dev == ign->fb_tunnel_dev) {
1351			err = -EFAULT;
1352			if (copy_from_user(&p, data, sizeof(p)))
1353				goto done;
1354			err = -ENOENT;
1355			ip6gre_tnl_parm_from_user(&p1, &p);
1356			t = ip6gre_tunnel_locate(net, &p1, 0);
1357			if (!t)
1358				goto done;
1359			err = -EPERM;
1360			if (t == netdev_priv(ign->fb_tunnel_dev))
1361				goto done;
1362			dev = t->dev;
1363		}
1364		unregister_netdevice(dev);
1365		err = 0;
1366		break;
1367
1368	default:
1369		err = -EINVAL;
1370	}
1371
1372done:
1373	return err;
1374}
1375
1376static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1377			 unsigned short type, const void *daddr,
1378			 const void *saddr, unsigned int len)
1379{
1380	struct ip6_tnl *t = netdev_priv(dev);
1381	struct ipv6hdr *ipv6h;
1382	__be16 *p;
1383
1384	ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1385	ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1386						  t->fl.u.ip6.flowlabel,
1387						  true, &t->fl.u.ip6));
1388	ipv6h->hop_limit = t->parms.hop_limit;
1389	ipv6h->nexthdr = NEXTHDR_GRE;
1390	ipv6h->saddr = t->parms.laddr;
1391	ipv6h->daddr = t->parms.raddr;
1392
1393	p = (__be16 *)(ipv6h + 1);
1394	p[0] = t->parms.o_flags;
1395	p[1] = htons(type);
1396
1397	/*
1398	 *	Set the source hardware address.
1399	 */
1400
1401	if (saddr)
1402		memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1403	if (daddr)
1404		memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1405	if (!ipv6_addr_any(&ipv6h->daddr))
1406		return t->hlen;
1407
1408	return -t->hlen;
1409}
1410
1411static const struct header_ops ip6gre_header_ops = {
1412	.create	= ip6gre_header,
1413};
1414
1415static const struct net_device_ops ip6gre_netdev_ops = {
1416	.ndo_init		= ip6gre_tunnel_init,
1417	.ndo_uninit		= ip6gre_tunnel_uninit,
1418	.ndo_start_xmit		= ip6gre_tunnel_xmit,
1419	.ndo_siocdevprivate	= ip6gre_tunnel_siocdevprivate,
1420	.ndo_change_mtu		= ip6_tnl_change_mtu,
1421	.ndo_get_stats64	= dev_get_tstats64,
1422	.ndo_get_iflink		= ip6_tnl_get_iflink,
1423};
1424
1425static void ip6gre_dev_free(struct net_device *dev)
1426{
1427	struct ip6_tnl *t = netdev_priv(dev);
1428
1429	gro_cells_destroy(&t->gro_cells);
1430	dst_cache_destroy(&t->dst_cache);
1431	free_percpu(dev->tstats);
1432}
1433
1434static void ip6gre_tunnel_setup(struct net_device *dev)
1435{
1436	dev->netdev_ops = &ip6gre_netdev_ops;
1437	dev->needs_free_netdev = true;
1438	dev->priv_destructor = ip6gre_dev_free;
1439
 
1440	dev->type = ARPHRD_IP6GRE;
1441
1442	dev->flags |= IFF_NOARP;
1443	dev->addr_len = sizeof(struct in6_addr);
1444	netif_keep_dst(dev);
1445	/* This perm addr will be used as interface identifier by IPv6 */
1446	dev->addr_assign_type = NET_ADDR_RANDOM;
1447	eth_random_addr(dev->perm_addr);
1448}
1449
1450#define GRE6_FEATURES (NETIF_F_SG |		\
1451		       NETIF_F_FRAGLIST |	\
1452		       NETIF_F_HIGHDMA |	\
1453		       NETIF_F_HW_CSUM)
1454
1455static void ip6gre_tnl_init_features(struct net_device *dev)
1456{
1457	struct ip6_tnl *nt = netdev_priv(dev);
1458	__be16 flags;
1459
1460	dev->features		|= GRE6_FEATURES | NETIF_F_LLTX;
1461	dev->hw_features	|= GRE6_FEATURES;
1462
1463	flags = nt->parms.o_flags;
1464
1465	/* TCP offload with GRE SEQ is not supported, nor can we support 2
1466	 * levels of outer headers requiring an update.
1467	 */
1468	if (flags & TUNNEL_SEQ)
1469		return;
1470	if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
 
1471		return;
1472
1473	dev->features |= NETIF_F_GSO_SOFTWARE;
1474	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
 
 
1475}
1476
1477static int ip6gre_tunnel_init_common(struct net_device *dev)
1478{
1479	struct ip6_tnl *tunnel;
1480	int ret;
1481	int t_hlen;
1482
1483	tunnel = netdev_priv(dev);
1484
1485	tunnel->dev = dev;
1486	tunnel->net = dev_net(dev);
1487	strcpy(tunnel->parms.name, dev->name);
1488
1489	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1490	if (!dev->tstats)
1491		return -ENOMEM;
1492
1493	ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1494	if (ret)
1495		goto cleanup_alloc_pcpu_stats;
1496
1497	ret = gro_cells_init(&tunnel->gro_cells, dev);
1498	if (ret)
1499		goto cleanup_dst_cache_init;
1500
1501	t_hlen = ip6gre_calc_hlen(tunnel);
1502	dev->mtu = ETH_DATA_LEN - t_hlen;
1503	if (dev->type == ARPHRD_ETHER)
1504		dev->mtu -= ETH_HLEN;
1505	if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1506		dev->mtu -= 8;
1507
1508	if (tunnel->parms.collect_md) {
1509		netif_keep_dst(dev);
1510	}
1511	ip6gre_tnl_init_features(dev);
1512
1513	netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
 
1514	return 0;
1515
1516cleanup_dst_cache_init:
1517	dst_cache_destroy(&tunnel->dst_cache);
1518cleanup_alloc_pcpu_stats:
1519	free_percpu(dev->tstats);
1520	dev->tstats = NULL;
1521	return ret;
1522}
1523
1524static int ip6gre_tunnel_init(struct net_device *dev)
1525{
1526	struct ip6_tnl *tunnel;
1527	int ret;
1528
1529	ret = ip6gre_tunnel_init_common(dev);
1530	if (ret)
1531		return ret;
1532
1533	tunnel = netdev_priv(dev);
1534
1535	if (tunnel->parms.collect_md)
1536		return 0;
1537
1538	__dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1539	memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1540
1541	if (ipv6_addr_any(&tunnel->parms.raddr))
1542		dev->header_ops = &ip6gre_header_ops;
1543
1544	return 0;
1545}
1546
1547static void ip6gre_fb_tunnel_init(struct net_device *dev)
1548{
1549	struct ip6_tnl *tunnel = netdev_priv(dev);
1550
1551	tunnel->dev = dev;
1552	tunnel->net = dev_net(dev);
1553	strcpy(tunnel->parms.name, dev->name);
1554
1555	tunnel->hlen		= sizeof(struct ipv6hdr) + 4;
1556}
1557
1558static struct inet6_protocol ip6gre_protocol __read_mostly = {
1559	.handler     = gre_rcv,
1560	.err_handler = ip6gre_err,
1561	.flags       = INET6_PROTO_FINAL,
1562};
1563
1564static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1565{
1566	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1567	struct net_device *dev, *aux;
1568	int prio;
1569
1570	for_each_netdev_safe(net, dev, aux)
1571		if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1572		    dev->rtnl_link_ops == &ip6gre_tap_ops ||
1573		    dev->rtnl_link_ops == &ip6erspan_tap_ops)
1574			unregister_netdevice_queue(dev, head);
1575
1576	for (prio = 0; prio < 4; prio++) {
1577		int h;
1578		for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1579			struct ip6_tnl *t;
1580
1581			t = rtnl_dereference(ign->tunnels[prio][h]);
1582
1583			while (t) {
1584				/* If dev is in the same netns, it has already
1585				 * been added to the list by the previous loop.
1586				 */
1587				if (!net_eq(dev_net(t->dev), net))
1588					unregister_netdevice_queue(t->dev,
1589								   head);
1590				t = rtnl_dereference(t->next);
1591			}
1592		}
1593	}
1594}
1595
1596static int __net_init ip6gre_init_net(struct net *net)
1597{
1598	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1599	struct net_device *ndev;
1600	int err;
1601
1602	if (!net_has_fallback_tunnels(net))
1603		return 0;
1604	ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1605			    NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1606	if (!ndev) {
1607		err = -ENOMEM;
1608		goto err_alloc_dev;
1609	}
1610	ign->fb_tunnel_dev = ndev;
1611	dev_net_set(ign->fb_tunnel_dev, net);
1612	/* FB netdevice is special: we have one, and only one per netns.
1613	 * Allowing to move it to another netns is clearly unsafe.
1614	 */
1615	ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1616
1617
1618	ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1619	ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1620
1621	err = register_netdev(ign->fb_tunnel_dev);
1622	if (err)
1623		goto err_reg_dev;
1624
1625	rcu_assign_pointer(ign->tunnels_wc[0],
1626			   netdev_priv(ign->fb_tunnel_dev));
1627	return 0;
1628
1629err_reg_dev:
1630	free_netdev(ndev);
1631err_alloc_dev:
1632	return err;
1633}
1634
1635static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
 
1636{
1637	struct net *net;
1638	LIST_HEAD(list);
1639
1640	rtnl_lock();
1641	list_for_each_entry(net, net_list, exit_list)
1642		ip6gre_destroy_tunnels(net, &list);
1643	unregister_netdevice_many(&list);
1644	rtnl_unlock();
1645}
1646
1647static struct pernet_operations ip6gre_net_ops = {
1648	.init = ip6gre_init_net,
1649	.exit_batch = ip6gre_exit_batch_net,
1650	.id   = &ip6gre_net_id,
1651	.size = sizeof(struct ip6gre_net),
1652};
1653
1654static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1655				  struct netlink_ext_ack *extack)
1656{
1657	__be16 flags;
1658
1659	if (!data)
1660		return 0;
1661
1662	flags = 0;
1663	if (data[IFLA_GRE_IFLAGS])
1664		flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1665	if (data[IFLA_GRE_OFLAGS])
1666		flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1667	if (flags & (GRE_VERSION|GRE_ROUTING))
1668		return -EINVAL;
1669
1670	return 0;
1671}
1672
1673static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1674			       struct netlink_ext_ack *extack)
1675{
1676	struct in6_addr daddr;
1677
1678	if (tb[IFLA_ADDRESS]) {
1679		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1680			return -EINVAL;
1681		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1682			return -EADDRNOTAVAIL;
1683	}
1684
1685	if (!data)
1686		goto out;
1687
1688	if (data[IFLA_GRE_REMOTE]) {
1689		daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1690		if (ipv6_addr_any(&daddr))
1691			return -EINVAL;
1692	}
1693
1694out:
1695	return ip6gre_tunnel_validate(tb, data, extack);
1696}
1697
1698static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1699				  struct netlink_ext_ack *extack)
1700{
1701	__be16 flags = 0;
1702	int ret, ver = 0;
1703
1704	if (!data)
1705		return 0;
1706
1707	ret = ip6gre_tap_validate(tb, data, extack);
1708	if (ret)
1709		return ret;
1710
1711	/* ERSPAN should only have GRE sequence and key flag */
1712	if (data[IFLA_GRE_OFLAGS])
1713		flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1714	if (data[IFLA_GRE_IFLAGS])
1715		flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1716	if (!data[IFLA_GRE_COLLECT_METADATA] &&
1717	    flags != (GRE_SEQ | GRE_KEY))
1718		return -EINVAL;
1719
1720	/* ERSPAN Session ID only has 10-bit. Since we reuse
1721	 * 32-bit key field as ID, check it's range.
1722	 */
1723	if (data[IFLA_GRE_IKEY] &&
1724	    (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1725		return -EINVAL;
1726
1727	if (data[IFLA_GRE_OKEY] &&
1728	    (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1729		return -EINVAL;
1730
1731	if (data[IFLA_GRE_ERSPAN_VER]) {
1732		ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1733		if (ver != 1 && ver != 2)
1734			return -EINVAL;
1735	}
1736
1737	if (ver == 1) {
1738		if (data[IFLA_GRE_ERSPAN_INDEX]) {
1739			u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1740
1741			if (index & ~INDEX_MASK)
1742				return -EINVAL;
1743		}
1744	} else if (ver == 2) {
1745		if (data[IFLA_GRE_ERSPAN_DIR]) {
1746			u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1747
1748			if (dir & ~(DIR_MASK >> DIR_OFFSET))
1749				return -EINVAL;
1750		}
1751
1752		if (data[IFLA_GRE_ERSPAN_HWID]) {
1753			u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1754
1755			if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1756				return -EINVAL;
1757		}
1758	}
1759
1760	return 0;
1761}
1762
1763static void ip6erspan_set_version(struct nlattr *data[],
1764				  struct __ip6_tnl_parm *parms)
1765{
1766	if (!data)
1767		return;
1768
1769	parms->erspan_ver = 1;
1770	if (data[IFLA_GRE_ERSPAN_VER])
1771		parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1772
1773	if (parms->erspan_ver == 1) {
1774		if (data[IFLA_GRE_ERSPAN_INDEX])
1775			parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1776	} else if (parms->erspan_ver == 2) {
1777		if (data[IFLA_GRE_ERSPAN_DIR])
1778			parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1779		if (data[IFLA_GRE_ERSPAN_HWID])
1780			parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1781	}
1782}
1783
1784static void ip6gre_netlink_parms(struct nlattr *data[],
1785				struct __ip6_tnl_parm *parms)
1786{
1787	memset(parms, 0, sizeof(*parms));
1788
1789	if (!data)
1790		return;
1791
1792	if (data[IFLA_GRE_LINK])
1793		parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1794
1795	if (data[IFLA_GRE_IFLAGS])
1796		parms->i_flags = gre_flags_to_tnl_flags(
1797				nla_get_be16(data[IFLA_GRE_IFLAGS]));
1798
1799	if (data[IFLA_GRE_OFLAGS])
1800		parms->o_flags = gre_flags_to_tnl_flags(
1801				nla_get_be16(data[IFLA_GRE_OFLAGS]));
1802
1803	if (data[IFLA_GRE_IKEY])
1804		parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1805
1806	if (data[IFLA_GRE_OKEY])
1807		parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1808
1809	if (data[IFLA_GRE_LOCAL])
1810		parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1811
1812	if (data[IFLA_GRE_REMOTE])
1813		parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1814
1815	if (data[IFLA_GRE_TTL])
1816		parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1817
1818	if (data[IFLA_GRE_ENCAP_LIMIT])
1819		parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1820
1821	if (data[IFLA_GRE_FLOWINFO])
1822		parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1823
1824	if (data[IFLA_GRE_FLAGS])
1825		parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1826
1827	if (data[IFLA_GRE_FWMARK])
1828		parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1829
1830	if (data[IFLA_GRE_COLLECT_METADATA])
1831		parms->collect_md = true;
1832}
1833
1834static int ip6gre_tap_init(struct net_device *dev)
1835{
1836	int ret;
1837
1838	ret = ip6gre_tunnel_init_common(dev);
1839	if (ret)
1840		return ret;
1841
1842	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1843
1844	return 0;
1845}
1846
1847static const struct net_device_ops ip6gre_tap_netdev_ops = {
1848	.ndo_init = ip6gre_tap_init,
1849	.ndo_uninit = ip6gre_tunnel_uninit,
1850	.ndo_start_xmit = ip6gre_tunnel_xmit,
1851	.ndo_set_mac_address = eth_mac_addr,
1852	.ndo_validate_addr = eth_validate_addr,
1853	.ndo_change_mtu = ip6_tnl_change_mtu,
1854	.ndo_get_stats64 = dev_get_tstats64,
1855	.ndo_get_iflink = ip6_tnl_get_iflink,
1856};
1857
1858static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1859{
1860	int t_hlen;
1861
1862	tunnel->tun_hlen = 8;
1863	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1864		       erspan_hdr_len(tunnel->parms.erspan_ver);
1865
1866	t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1867	tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1868	return t_hlen;
1869}
1870
1871static int ip6erspan_tap_init(struct net_device *dev)
1872{
1873	struct ip6_tnl *tunnel;
1874	int t_hlen;
1875	int ret;
1876
1877	tunnel = netdev_priv(dev);
1878
1879	tunnel->dev = dev;
1880	tunnel->net = dev_net(dev);
1881	strcpy(tunnel->parms.name, dev->name);
1882
1883	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1884	if (!dev->tstats)
1885		return -ENOMEM;
1886
1887	ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1888	if (ret)
1889		goto cleanup_alloc_pcpu_stats;
1890
1891	ret = gro_cells_init(&tunnel->gro_cells, dev);
1892	if (ret)
1893		goto cleanup_dst_cache_init;
1894
1895	t_hlen = ip6erspan_calc_hlen(tunnel);
1896	dev->mtu = ETH_DATA_LEN - t_hlen;
1897	if (dev->type == ARPHRD_ETHER)
1898		dev->mtu -= ETH_HLEN;
1899	if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1900		dev->mtu -= 8;
1901
1902	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1903	ip6erspan_tnl_link_config(tunnel, 1);
1904
1905	netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
 
1906	return 0;
1907
1908cleanup_dst_cache_init:
1909	dst_cache_destroy(&tunnel->dst_cache);
1910cleanup_alloc_pcpu_stats:
1911	free_percpu(dev->tstats);
1912	dev->tstats = NULL;
1913	return ret;
1914}
1915
1916static const struct net_device_ops ip6erspan_netdev_ops = {
1917	.ndo_init =		ip6erspan_tap_init,
1918	.ndo_uninit =		ip6erspan_tunnel_uninit,
1919	.ndo_start_xmit =	ip6erspan_tunnel_xmit,
1920	.ndo_set_mac_address =	eth_mac_addr,
1921	.ndo_validate_addr =	eth_validate_addr,
1922	.ndo_change_mtu =	ip6_tnl_change_mtu,
1923	.ndo_get_stats64 =	dev_get_tstats64,
1924	.ndo_get_iflink =	ip6_tnl_get_iflink,
1925};
1926
1927static void ip6gre_tap_setup(struct net_device *dev)
1928{
1929
1930	ether_setup(dev);
1931
1932	dev->max_mtu = 0;
1933	dev->netdev_ops = &ip6gre_tap_netdev_ops;
1934	dev->needs_free_netdev = true;
1935	dev->priv_destructor = ip6gre_dev_free;
1936
 
1937	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1938	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1939	netif_keep_dst(dev);
1940}
1941
1942static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1943				       struct ip_tunnel_encap *ipencap)
1944{
1945	bool ret = false;
1946
1947	memset(ipencap, 0, sizeof(*ipencap));
1948
1949	if (!data)
1950		return ret;
1951
1952	if (data[IFLA_GRE_ENCAP_TYPE]) {
1953		ret = true;
1954		ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1955	}
1956
1957	if (data[IFLA_GRE_ENCAP_FLAGS]) {
1958		ret = true;
1959		ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1960	}
1961
1962	if (data[IFLA_GRE_ENCAP_SPORT]) {
1963		ret = true;
1964		ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1965	}
1966
1967	if (data[IFLA_GRE_ENCAP_DPORT]) {
1968		ret = true;
1969		ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1970	}
1971
1972	return ret;
1973}
1974
1975static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1976				 struct nlattr *tb[], struct nlattr *data[],
1977				 struct netlink_ext_ack *extack)
1978{
1979	struct ip6_tnl *nt;
1980	struct ip_tunnel_encap ipencap;
1981	int err;
1982
1983	nt = netdev_priv(dev);
1984
1985	if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1986		int err = ip6_tnl_encap_setup(nt, &ipencap);
1987
1988		if (err < 0)
1989			return err;
1990	}
1991
1992	if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1993		eth_hw_addr_random(dev);
1994
1995	nt->dev = dev;
1996	nt->net = dev_net(dev);
1997
1998	err = register_netdevice(dev);
1999	if (err)
2000		goto out;
2001
2002	if (tb[IFLA_MTU])
2003		ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2004
2005out:
2006	return err;
2007}
2008
2009static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2010			  struct nlattr *tb[], struct nlattr *data[],
2011			  struct netlink_ext_ack *extack)
2012{
2013	struct ip6_tnl *nt = netdev_priv(dev);
2014	struct net *net = dev_net(dev);
2015	struct ip6gre_net *ign;
2016	int err;
2017
2018	ip6gre_netlink_parms(data, &nt->parms);
2019	ign = net_generic(net, ip6gre_net_id);
2020
2021	if (nt->parms.collect_md) {
2022		if (rtnl_dereference(ign->collect_md_tun))
2023			return -EEXIST;
2024	} else {
2025		if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2026			return -EEXIST;
2027	}
2028
2029	err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2030	if (!err) {
2031		ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2032		ip6gre_tunnel_link_md(ign, nt);
2033		ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2034	}
2035	return err;
2036}
2037
2038static struct ip6_tnl *
2039ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2040			 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2041			 struct netlink_ext_ack *extack)
2042{
2043	struct ip6_tnl *t, *nt = netdev_priv(dev);
2044	struct net *net = nt->net;
2045	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2046	struct ip_tunnel_encap ipencap;
2047
2048	if (dev == ign->fb_tunnel_dev)
2049		return ERR_PTR(-EINVAL);
2050
2051	if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2052		int err = ip6_tnl_encap_setup(nt, &ipencap);
2053
2054		if (err < 0)
2055			return ERR_PTR(err);
2056	}
2057
2058	ip6gre_netlink_parms(data, p_p);
2059
2060	t = ip6gre_tunnel_locate(net, p_p, 0);
2061
2062	if (t) {
2063		if (t->dev != dev)
2064			return ERR_PTR(-EEXIST);
2065	} else {
2066		t = nt;
2067	}
2068
2069	return t;
2070}
2071
2072static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2073			     struct nlattr *data[],
2074			     struct netlink_ext_ack *extack)
2075{
2076	struct ip6_tnl *t = netdev_priv(dev);
2077	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2078	struct __ip6_tnl_parm p;
2079
2080	t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2081	if (IS_ERR(t))
2082		return PTR_ERR(t);
2083
2084	ip6gre_tunnel_unlink_md(ign, t);
2085	ip6gre_tunnel_unlink(ign, t);
2086	ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2087	ip6gre_tunnel_link_md(ign, t);
2088	ip6gre_tunnel_link(ign, t);
2089	return 0;
2090}
2091
2092static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2093{
2094	struct net *net = dev_net(dev);
2095	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2096
2097	if (dev != ign->fb_tunnel_dev)
2098		unregister_netdevice_queue(dev, head);
2099}
2100
2101static size_t ip6gre_get_size(const struct net_device *dev)
2102{
2103	return
2104		/* IFLA_GRE_LINK */
2105		nla_total_size(4) +
2106		/* IFLA_GRE_IFLAGS */
2107		nla_total_size(2) +
2108		/* IFLA_GRE_OFLAGS */
2109		nla_total_size(2) +
2110		/* IFLA_GRE_IKEY */
2111		nla_total_size(4) +
2112		/* IFLA_GRE_OKEY */
2113		nla_total_size(4) +
2114		/* IFLA_GRE_LOCAL */
2115		nla_total_size(sizeof(struct in6_addr)) +
2116		/* IFLA_GRE_REMOTE */
2117		nla_total_size(sizeof(struct in6_addr)) +
2118		/* IFLA_GRE_TTL */
2119		nla_total_size(1) +
2120		/* IFLA_GRE_ENCAP_LIMIT */
2121		nla_total_size(1) +
2122		/* IFLA_GRE_FLOWINFO */
2123		nla_total_size(4) +
2124		/* IFLA_GRE_FLAGS */
2125		nla_total_size(4) +
2126		/* IFLA_GRE_ENCAP_TYPE */
2127		nla_total_size(2) +
2128		/* IFLA_GRE_ENCAP_FLAGS */
2129		nla_total_size(2) +
2130		/* IFLA_GRE_ENCAP_SPORT */
2131		nla_total_size(2) +
2132		/* IFLA_GRE_ENCAP_DPORT */
2133		nla_total_size(2) +
2134		/* IFLA_GRE_COLLECT_METADATA */
2135		nla_total_size(0) +
2136		/* IFLA_GRE_FWMARK */
2137		nla_total_size(4) +
2138		/* IFLA_GRE_ERSPAN_INDEX */
2139		nla_total_size(4) +
2140		0;
2141}
2142
2143static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2144{
2145	struct ip6_tnl *t = netdev_priv(dev);
2146	struct __ip6_tnl_parm *p = &t->parms;
2147	__be16 o_flags = p->o_flags;
 
 
2148
2149	if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2150		if (!p->collect_md)
2151			o_flags |= TUNNEL_KEY;
2152
2153		if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2154			goto nla_put_failure;
2155
2156		if (p->erspan_ver == 1) {
2157			if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2158				goto nla_put_failure;
2159		} else {
2160			if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2161				goto nla_put_failure;
2162			if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2163				goto nla_put_failure;
2164		}
2165	}
2166
2167	if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2168	    nla_put_be16(skb, IFLA_GRE_IFLAGS,
2169			 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2170	    nla_put_be16(skb, IFLA_GRE_OFLAGS,
2171			 gre_tnl_flags_to_gre_flags(o_flags)) ||
2172	    nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2173	    nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2174	    nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2175	    nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2176	    nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2177	    nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2178	    nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2179	    nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2180	    nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2181		goto nla_put_failure;
2182
2183	if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2184			t->encap.type) ||
2185	    nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2186			 t->encap.sport) ||
2187	    nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2188			 t->encap.dport) ||
2189	    nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2190			t->encap.flags))
2191		goto nla_put_failure;
2192
2193	if (p->collect_md) {
2194		if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2195			goto nla_put_failure;
2196	}
2197
2198	return 0;
2199
2200nla_put_failure:
2201	return -EMSGSIZE;
2202}
2203
2204static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2205	[IFLA_GRE_LINK]        = { .type = NLA_U32 },
2206	[IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2207	[IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2208	[IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2209	[IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2210	[IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2211	[IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2212	[IFLA_GRE_TTL]         = { .type = NLA_U8 },
2213	[IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2214	[IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2215	[IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2216	[IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2217	[IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2218	[IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2219	[IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2220	[IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2221	[IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2222	[IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2223	[IFLA_GRE_ERSPAN_VER]	= { .type = NLA_U8 },
2224	[IFLA_GRE_ERSPAN_DIR]	= { .type = NLA_U8 },
2225	[IFLA_GRE_ERSPAN_HWID]	= { .type = NLA_U16 },
2226};
2227
2228static void ip6erspan_tap_setup(struct net_device *dev)
2229{
2230	ether_setup(dev);
2231
2232	dev->max_mtu = 0;
2233	dev->netdev_ops = &ip6erspan_netdev_ops;
2234	dev->needs_free_netdev = true;
2235	dev->priv_destructor = ip6gre_dev_free;
2236
 
2237	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2238	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2239	netif_keep_dst(dev);
2240}
2241
2242static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2243			     struct nlattr *tb[], struct nlattr *data[],
2244			     struct netlink_ext_ack *extack)
2245{
2246	struct ip6_tnl *nt = netdev_priv(dev);
2247	struct net *net = dev_net(dev);
2248	struct ip6gre_net *ign;
2249	int err;
2250
2251	ip6gre_netlink_parms(data, &nt->parms);
2252	ip6erspan_set_version(data, &nt->parms);
2253	ign = net_generic(net, ip6gre_net_id);
2254
2255	if (nt->parms.collect_md) {
2256		if (rtnl_dereference(ign->collect_md_tun_erspan))
2257			return -EEXIST;
2258	} else {
2259		if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2260			return -EEXIST;
2261	}
2262
2263	err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2264	if (!err) {
2265		ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2266		ip6erspan_tunnel_link_md(ign, nt);
2267		ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2268	}
2269	return err;
2270}
2271
2272static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2273{
2274	ip6gre_tnl_link_config_common(t);
2275	ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2276}
2277
2278static int ip6erspan_tnl_change(struct ip6_tnl *t,
2279				const struct __ip6_tnl_parm *p, int set_mtu)
2280{
2281	ip6gre_tnl_copy_tnl_parm(t, p);
2282	ip6erspan_tnl_link_config(t, set_mtu);
2283	return 0;
2284}
2285
2286static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2287				struct nlattr *data[],
2288				struct netlink_ext_ack *extack)
2289{
2290	struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2291	struct __ip6_tnl_parm p;
2292	struct ip6_tnl *t;
2293
2294	t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2295	if (IS_ERR(t))
2296		return PTR_ERR(t);
2297
2298	ip6erspan_set_version(data, &p);
2299	ip6gre_tunnel_unlink_md(ign, t);
2300	ip6gre_tunnel_unlink(ign, t);
2301	ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2302	ip6erspan_tunnel_link_md(ign, t);
2303	ip6gre_tunnel_link(ign, t);
2304	return 0;
2305}
2306
2307static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2308	.kind		= "ip6gre",
2309	.maxtype	= IFLA_GRE_MAX,
2310	.policy		= ip6gre_policy,
2311	.priv_size	= sizeof(struct ip6_tnl),
2312	.setup		= ip6gre_tunnel_setup,
2313	.validate	= ip6gre_tunnel_validate,
2314	.newlink	= ip6gre_newlink,
2315	.changelink	= ip6gre_changelink,
2316	.dellink	= ip6gre_dellink,
2317	.get_size	= ip6gre_get_size,
2318	.fill_info	= ip6gre_fill_info,
2319	.get_link_net	= ip6_tnl_get_link_net,
2320};
2321
2322static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2323	.kind		= "ip6gretap",
2324	.maxtype	= IFLA_GRE_MAX,
2325	.policy		= ip6gre_policy,
2326	.priv_size	= sizeof(struct ip6_tnl),
2327	.setup		= ip6gre_tap_setup,
2328	.validate	= ip6gre_tap_validate,
2329	.newlink	= ip6gre_newlink,
2330	.changelink	= ip6gre_changelink,
2331	.get_size	= ip6gre_get_size,
2332	.fill_info	= ip6gre_fill_info,
2333	.get_link_net	= ip6_tnl_get_link_net,
2334};
2335
2336static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2337	.kind		= "ip6erspan",
2338	.maxtype	= IFLA_GRE_MAX,
2339	.policy		= ip6gre_policy,
2340	.priv_size	= sizeof(struct ip6_tnl),
2341	.setup		= ip6erspan_tap_setup,
2342	.validate	= ip6erspan_tap_validate,
2343	.newlink	= ip6erspan_newlink,
2344	.changelink	= ip6erspan_changelink,
2345	.get_size	= ip6gre_get_size,
2346	.fill_info	= ip6gre_fill_info,
2347	.get_link_net	= ip6_tnl_get_link_net,
2348};
2349
2350/*
2351 *	And now the modules code and kernel interface.
2352 */
2353
2354static int __init ip6gre_init(void)
2355{
2356	int err;
2357
2358	pr_info("GRE over IPv6 tunneling driver\n");
2359
2360	err = register_pernet_device(&ip6gre_net_ops);
2361	if (err < 0)
2362		return err;
2363
2364	err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365	if (err < 0) {
2366		pr_info("%s: can't add protocol\n", __func__);
2367		goto add_proto_failed;
2368	}
2369
2370	err = rtnl_link_register(&ip6gre_link_ops);
2371	if (err < 0)
2372		goto rtnl_link_failed;
2373
2374	err = rtnl_link_register(&ip6gre_tap_ops);
2375	if (err < 0)
2376		goto tap_ops_failed;
2377
2378	err = rtnl_link_register(&ip6erspan_tap_ops);
2379	if (err < 0)
2380		goto erspan_link_failed;
2381
2382out:
2383	return err;
2384
2385erspan_link_failed:
2386	rtnl_link_unregister(&ip6gre_tap_ops);
2387tap_ops_failed:
2388	rtnl_link_unregister(&ip6gre_link_ops);
2389rtnl_link_failed:
2390	inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2391add_proto_failed:
2392	unregister_pernet_device(&ip6gre_net_ops);
2393	goto out;
2394}
2395
2396static void __exit ip6gre_fini(void)
2397{
2398	rtnl_link_unregister(&ip6gre_tap_ops);
2399	rtnl_link_unregister(&ip6gre_link_ops);
2400	rtnl_link_unregister(&ip6erspan_tap_ops);
2401	inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2402	unregister_pernet_device(&ip6gre_net_ops);
2403}
2404
2405module_init(ip6gre_init);
2406module_exit(ip6gre_fini);
2407MODULE_LICENSE("GPL");
2408MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2409MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2410MODULE_ALIAS_RTNL_LINK("ip6gre");
2411MODULE_ALIAS_RTNL_LINK("ip6gretap");
2412MODULE_ALIAS_RTNL_LINK("ip6erspan");
2413MODULE_ALIAS_NETDEV("ip6gre0");
v6.13.7
   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/rtnetlink.h>
  47
  48#include <net/ipv6.h>
  49#include <net/ip6_fib.h>
  50#include <net/ip6_route.h>
  51#include <net/ip6_tunnel.h>
  52#include <net/gre.h>
  53#include <net/erspan.h>
  54#include <net/dst_metadata.h>
  55
  56
  57static bool log_ecn_error = true;
  58module_param(log_ecn_error, bool, 0644);
  59MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  60
  61#define IP6_GRE_HASH_SIZE_SHIFT  5
  62#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
  63
  64static unsigned int ip6gre_net_id __read_mostly;
  65struct ip6gre_net {
  66	struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
  67
  68	struct ip6_tnl __rcu *collect_md_tun;
  69	struct ip6_tnl __rcu *collect_md_tun_erspan;
  70	struct net_device *fb_tunnel_dev;
  71};
  72
  73static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  74static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  75static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  76static int ip6gre_tunnel_init(struct net_device *dev);
  77static void ip6gre_tunnel_setup(struct net_device *dev);
  78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  80static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  81
  82/* Tunnel hash table */
  83
  84/*
  85   4 hash tables:
  86
  87   3: (remote,local)
  88   2: (remote,*)
  89   1: (*,local)
  90   0: (*,*)
  91
  92   We require exact key match i.e. if a key is present in packet
  93   it will match only tunnel with the same key; if it is not present,
  94   it will match only keyless tunnel.
  95
  96   All keysless packets, if not matched configured keyless tunnels
  97   will match fallback tunnel.
  98 */
  99
 100#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 101static u32 HASH_ADDR(const struct in6_addr *addr)
 102{
 103	u32 hash = ipv6_addr_hash(addr);
 104
 105	return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 106}
 107
 108#define tunnels_r_l	tunnels[3]
 109#define tunnels_r	tunnels[2]
 110#define tunnels_l	tunnels[1]
 111#define tunnels_wc	tunnels[0]
 112
 113/* Given src, dst and key, find appropriate for input tunnel. */
 114
 115static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 116		const struct in6_addr *remote, const struct in6_addr *local,
 117		__be32 key, __be16 gre_proto)
 118{
 119	struct net *net = dev_net(dev);
 120	int link = dev->ifindex;
 121	unsigned int h0 = HASH_ADDR(remote);
 122	unsigned int h1 = HASH_KEY(key);
 123	struct ip6_tnl *t, *cand = NULL;
 124	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 125	int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 126			gre_proto == htons(ETH_P_ERSPAN) ||
 127			gre_proto == htons(ETH_P_ERSPAN2)) ?
 128		       ARPHRD_ETHER : ARPHRD_IP6GRE;
 129	int score, cand_score = 4;
 130	struct net_device *ndev;
 131
 132	for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 133		if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 134		    !ipv6_addr_equal(remote, &t->parms.raddr) ||
 135		    key != t->parms.i_key ||
 136		    !(t->dev->flags & IFF_UP))
 137			continue;
 138
 139		if (t->dev->type != ARPHRD_IP6GRE &&
 140		    t->dev->type != dev_type)
 141			continue;
 142
 143		score = 0;
 144		if (t->parms.link != link)
 145			score |= 1;
 146		if (t->dev->type != dev_type)
 147			score |= 2;
 148		if (score == 0)
 149			return t;
 150
 151		if (score < cand_score) {
 152			cand = t;
 153			cand_score = score;
 154		}
 155	}
 156
 157	for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 158		if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 159		    key != t->parms.i_key ||
 160		    !(t->dev->flags & IFF_UP))
 161			continue;
 162
 163		if (t->dev->type != ARPHRD_IP6GRE &&
 164		    t->dev->type != dev_type)
 165			continue;
 166
 167		score = 0;
 168		if (t->parms.link != link)
 169			score |= 1;
 170		if (t->dev->type != dev_type)
 171			score |= 2;
 172		if (score == 0)
 173			return t;
 174
 175		if (score < cand_score) {
 176			cand = t;
 177			cand_score = score;
 178		}
 179	}
 180
 181	for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 182		if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 183			  (!ipv6_addr_equal(local, &t->parms.raddr) ||
 184				 !ipv6_addr_is_multicast(local))) ||
 185		    key != t->parms.i_key ||
 186		    !(t->dev->flags & IFF_UP))
 187			continue;
 188
 189		if (t->dev->type != ARPHRD_IP6GRE &&
 190		    t->dev->type != dev_type)
 191			continue;
 192
 193		score = 0;
 194		if (t->parms.link != link)
 195			score |= 1;
 196		if (t->dev->type != dev_type)
 197			score |= 2;
 198		if (score == 0)
 199			return t;
 200
 201		if (score < cand_score) {
 202			cand = t;
 203			cand_score = score;
 204		}
 205	}
 206
 207	for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 208		if (t->parms.i_key != key ||
 209		    !(t->dev->flags & IFF_UP))
 210			continue;
 211
 212		if (t->dev->type != ARPHRD_IP6GRE &&
 213		    t->dev->type != dev_type)
 214			continue;
 215
 216		score = 0;
 217		if (t->parms.link != link)
 218			score |= 1;
 219		if (t->dev->type != dev_type)
 220			score |= 2;
 221		if (score == 0)
 222			return t;
 223
 224		if (score < cand_score) {
 225			cand = t;
 226			cand_score = score;
 227		}
 228	}
 229
 230	if (cand)
 231		return cand;
 232
 233	if (gre_proto == htons(ETH_P_ERSPAN) ||
 234	    gre_proto == htons(ETH_P_ERSPAN2))
 235		t = rcu_dereference(ign->collect_md_tun_erspan);
 236	else
 237		t = rcu_dereference(ign->collect_md_tun);
 238
 239	if (t && t->dev->flags & IFF_UP)
 240		return t;
 241
 242	ndev = READ_ONCE(ign->fb_tunnel_dev);
 243	if (ndev && ndev->flags & IFF_UP)
 244		return netdev_priv(ndev);
 245
 246	return NULL;
 247}
 248
 249static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 250		const struct __ip6_tnl_parm *p)
 251{
 252	const struct in6_addr *remote = &p->raddr;
 253	const struct in6_addr *local = &p->laddr;
 254	unsigned int h = HASH_KEY(p->i_key);
 255	int prio = 0;
 256
 257	if (!ipv6_addr_any(local))
 258		prio |= 1;
 259	if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 260		prio |= 2;
 261		h ^= HASH_ADDR(remote);
 262	}
 263
 264	return &ign->tunnels[prio][h];
 265}
 266
 267static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 268{
 269	if (t->parms.collect_md)
 270		rcu_assign_pointer(ign->collect_md_tun, t);
 271}
 272
 273static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 274{
 275	if (t->parms.collect_md)
 276		rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 277}
 278
 279static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 280{
 281	if (t->parms.collect_md)
 282		rcu_assign_pointer(ign->collect_md_tun, NULL);
 283}
 284
 285static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 286				       struct ip6_tnl *t)
 287{
 288	if (t->parms.collect_md)
 289		rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 290}
 291
 292static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 293		const struct ip6_tnl *t)
 294{
 295	return __ip6gre_bucket(ign, &t->parms);
 296}
 297
 298static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 299{
 300	struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 301
 302	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 303	rcu_assign_pointer(*tp, t);
 304}
 305
 306static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 307{
 308	struct ip6_tnl __rcu **tp;
 309	struct ip6_tnl *iter;
 310
 311	for (tp = ip6gre_bucket(ign, t);
 312	     (iter = rtnl_dereference(*tp)) != NULL;
 313	     tp = &iter->next) {
 314		if (t == iter) {
 315			rcu_assign_pointer(*tp, t->next);
 316			break;
 317		}
 318	}
 319}
 320
 321static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 322					   const struct __ip6_tnl_parm *parms,
 323					   int type)
 324{
 325	const struct in6_addr *remote = &parms->raddr;
 326	const struct in6_addr *local = &parms->laddr;
 327	__be32 key = parms->i_key;
 328	int link = parms->link;
 329	struct ip6_tnl *t;
 330	struct ip6_tnl __rcu **tp;
 331	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 332
 333	for (tp = __ip6gre_bucket(ign, parms);
 334	     (t = rtnl_dereference(*tp)) != NULL;
 335	     tp = &t->next)
 336		if (ipv6_addr_equal(local, &t->parms.laddr) &&
 337		    ipv6_addr_equal(remote, &t->parms.raddr) &&
 338		    key == t->parms.i_key &&
 339		    link == t->parms.link &&
 340		    type == t->dev->type)
 341			break;
 342
 343	return t;
 344}
 345
 346static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 347		const struct __ip6_tnl_parm *parms, int create)
 348{
 349	struct ip6_tnl *t, *nt;
 350	struct net_device *dev;
 351	char name[IFNAMSIZ];
 352	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 353
 354	t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 355	if (t && create)
 356		return NULL;
 357	if (t || !create)
 358		return t;
 359
 360	if (parms->name[0]) {
 361		if (!dev_valid_name(parms->name))
 362			return NULL;
 363		strscpy(name, parms->name, IFNAMSIZ);
 364	} else {
 365		strcpy(name, "ip6gre%d");
 366	}
 367	dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 368			   ip6gre_tunnel_setup);
 369	if (!dev)
 370		return NULL;
 371
 372	dev_net_set(dev, net);
 373
 374	nt = netdev_priv(dev);
 375	nt->parms = *parms;
 376	dev->rtnl_link_ops = &ip6gre_link_ops;
 377
 378	nt->dev = dev;
 379	nt->net = dev_net(dev);
 380
 381	if (register_netdevice(dev) < 0)
 382		goto failed_free;
 383
 384	ip6gre_tnl_link_config(nt, 1);
 385	ip6gre_tunnel_link(ign, nt);
 386	return nt;
 387
 388failed_free:
 389	free_netdev(dev);
 390	return NULL;
 391}
 392
 393static void ip6erspan_tunnel_uninit(struct net_device *dev)
 394{
 395	struct ip6_tnl *t = netdev_priv(dev);
 396	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 397
 398	ip6erspan_tunnel_unlink_md(ign, t);
 399	ip6gre_tunnel_unlink(ign, t);
 400	dst_cache_reset(&t->dst_cache);
 401	netdev_put(dev, &t->dev_tracker);
 402}
 403
 404static void ip6gre_tunnel_uninit(struct net_device *dev)
 405{
 406	struct ip6_tnl *t = netdev_priv(dev);
 407	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 408
 409	ip6gre_tunnel_unlink_md(ign, t);
 410	ip6gre_tunnel_unlink(ign, t);
 411	if (ign->fb_tunnel_dev == dev)
 412		WRITE_ONCE(ign->fb_tunnel_dev, NULL);
 413	dst_cache_reset(&t->dst_cache);
 414	netdev_put(dev, &t->dev_tracker);
 415}
 416
 417
 418static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 419		       u8 type, u8 code, int offset, __be32 info)
 420{
 421	struct net *net = dev_net(skb->dev);
 422	const struct ipv6hdr *ipv6h;
 423	struct tnl_ptk_info tpi;
 424	struct ip6_tnl *t;
 425
 426	if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
 427			     offset) < 0)
 428		return -EINVAL;
 429
 430	ipv6h = (const struct ipv6hdr *)skb->data;
 431	t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 432				 tpi.key, tpi.proto);
 433	if (!t)
 434		return -ENOENT;
 435
 436	switch (type) {
 437	case ICMPV6_DEST_UNREACH:
 438		net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 439				    t->parms.name);
 440		if (code != ICMPV6_PORT_UNREACH)
 441			break;
 442		return 0;
 443	case ICMPV6_TIME_EXCEED:
 444		if (code == ICMPV6_EXC_HOPLIMIT) {
 445			net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 446					    t->parms.name);
 447			break;
 448		}
 449		return 0;
 450	case ICMPV6_PARAMPROB: {
 451		struct ipv6_tlv_tnl_enc_lim *tel;
 452		__u32 teli;
 453
 454		teli = 0;
 455		if (code == ICMPV6_HDR_FIELD)
 456			teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 457
 458		if (teli && teli == be32_to_cpu(info) - 2) {
 459			tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 460			if (tel->encap_limit == 0) {
 461				net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 462						    t->parms.name);
 463			}
 464		} else {
 465			net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 466					    t->parms.name);
 467		}
 468		return 0;
 469	}
 470	case ICMPV6_PKT_TOOBIG:
 471		ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 472		return 0;
 473	case NDISC_REDIRECT:
 474		ip6_redirect(skb, net, skb->dev->ifindex, 0,
 475			     sock_net_uid(net, NULL));
 476		return 0;
 477	}
 478
 479	if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 480		t->err_count++;
 481	else
 482		t->err_count = 1;
 483	t->err_time = jiffies;
 484
 485	return 0;
 486}
 487
 488static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 489{
 490	const struct ipv6hdr *ipv6h;
 491	struct ip6_tnl *tunnel;
 492
 493	ipv6h = ipv6_hdr(skb);
 494	tunnel = ip6gre_tunnel_lookup(skb->dev,
 495				      &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 496				      tpi->proto);
 497	if (tunnel) {
 498		if (tunnel->parms.collect_md) {
 499			IP_TUNNEL_DECLARE_FLAGS(flags);
 500			struct metadata_dst *tun_dst;
 501			__be64 tun_id;
 
 502
 503			ip_tunnel_flags_copy(flags, tpi->flags);
 504			tun_id = key32_to_tunnel_id(tpi->key);
 505
 506			tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 507			if (!tun_dst)
 508				return PACKET_REJECT;
 509
 510			ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 511		} else {
 512			ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 513		}
 514
 515		return PACKET_RCVD;
 516	}
 517
 518	return PACKET_REJECT;
 519}
 520
 521static int ip6erspan_rcv(struct sk_buff *skb,
 522			 struct tnl_ptk_info *tpi,
 523			 int gre_hdr_len)
 524{
 525	struct erspan_base_hdr *ershdr;
 526	const struct ipv6hdr *ipv6h;
 527	struct erspan_md2 *md2;
 528	struct ip6_tnl *tunnel;
 529	u8 ver;
 530
 531	if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
 532		return PACKET_REJECT;
 533
 534	ipv6h = ipv6_hdr(skb);
 535	ershdr = (struct erspan_base_hdr *)skb->data;
 536	ver = ershdr->ver;
 537
 538	tunnel = ip6gre_tunnel_lookup(skb->dev,
 539				      &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 540				      tpi->proto);
 541	if (tunnel) {
 542		int len = erspan_hdr_len(ver);
 543
 544		if (unlikely(!pskb_may_pull(skb, len)))
 545			return PACKET_REJECT;
 546
 547		if (__iptunnel_pull_header(skb, len,
 548					   htons(ETH_P_TEB),
 549					   false, false) < 0)
 550			return PACKET_REJECT;
 551
 552		if (tunnel->parms.collect_md) {
 553			struct erspan_metadata *pkt_md, *md;
 554			IP_TUNNEL_DECLARE_FLAGS(flags);
 555			struct metadata_dst *tun_dst;
 556			struct ip_tunnel_info *info;
 557			unsigned char *gh;
 558			__be64 tun_id;
 
 559
 560			__set_bit(IP_TUNNEL_KEY_BIT, tpi->flags);
 561			ip_tunnel_flags_copy(flags, tpi->flags);
 562			tun_id = key32_to_tunnel_id(tpi->key);
 563
 564			tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 565						  sizeof(*md));
 566			if (!tun_dst)
 567				return PACKET_REJECT;
 568
 569			/* skb can be uncloned in __iptunnel_pull_header, so
 570			 * old pkt_md is no longer valid and we need to reset
 571			 * it
 572			 */
 573			gh = skb_network_header(skb) +
 574			     skb_network_header_len(skb);
 575			pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 576							    sizeof(*ershdr));
 577			info = &tun_dst->u.tun_info;
 578			md = ip_tunnel_info_opts(info);
 579			md->version = ver;
 580			md2 = &md->u.md2;
 581			memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 582						       ERSPAN_V2_MDSIZE);
 583			__set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
 584				  info->key.tun_flags);
 585			info->options_len = sizeof(*md);
 586
 587			ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 588
 589		} else {
 590			ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 591		}
 592
 593		return PACKET_RCVD;
 594	}
 595
 596	return PACKET_REJECT;
 597}
 598
 599static int gre_rcv(struct sk_buff *skb)
 600{
 601	struct tnl_ptk_info tpi;
 602	bool csum_err = false;
 603	int hdr_len;
 604
 605	hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 606	if (hdr_len < 0)
 607		goto drop;
 608
 609	if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 610		goto drop;
 611
 612	if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 613		     tpi.proto == htons(ETH_P_ERSPAN2))) {
 614		if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 615			return 0;
 616		goto out;
 617	}
 618
 619	if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 620		return 0;
 621
 622out:
 623	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 624drop:
 625	kfree_skb(skb);
 626	return 0;
 627}
 628
 629static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 630{
 631	return iptunnel_handle_offloads(skb,
 632					csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 633}
 634
 635static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 636				     struct net_device *dev,
 637				     struct flowi6 *fl6, __u8 *dsfield,
 638				     int *encap_limit)
 639{
 640	const struct iphdr *iph = ip_hdr(skb);
 641	struct ip6_tnl *t = netdev_priv(dev);
 642
 643	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 644		*encap_limit = t->parms.encap_limit;
 645
 646	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 647
 648	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 649		*dsfield = ipv4_get_dsfield(iph);
 650	else
 651		*dsfield = ip6_tclass(t->parms.flowinfo);
 652
 653	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 654		fl6->flowi6_mark = skb->mark;
 655	else
 656		fl6->flowi6_mark = t->parms.fwmark;
 657
 658	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 659}
 660
 661static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 662				    struct net_device *dev,
 663				    struct flowi6 *fl6, __u8 *dsfield,
 664				    int *encap_limit)
 665{
 666	struct ipv6hdr *ipv6h;
 667	struct ip6_tnl *t = netdev_priv(dev);
 668	__u16 offset;
 669
 670	offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 671	/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 672	ipv6h = ipv6_hdr(skb);
 673
 674	if (offset > 0) {
 675		struct ipv6_tlv_tnl_enc_lim *tel;
 676
 677		tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 678		if (tel->encap_limit == 0) {
 679			icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
 680					ICMPV6_HDR_FIELD, offset + 2);
 681			return -1;
 682		}
 683		*encap_limit = tel->encap_limit - 1;
 684	} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 685		*encap_limit = t->parms.encap_limit;
 686	}
 687
 688	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 689
 690	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 691		*dsfield = ipv6_get_dsfield(ipv6h);
 692	else
 693		*dsfield = ip6_tclass(t->parms.flowinfo);
 694
 695	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 696		fl6->flowlabel |= ip6_flowlabel(ipv6h);
 697
 698	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 699		fl6->flowi6_mark = skb->mark;
 700	else
 701		fl6->flowi6_mark = t->parms.fwmark;
 702
 703	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 704
 705	return 0;
 706}
 707
 708static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
 709				     struct net_device *dev,
 710				     struct flowi6 *fl6, __u8 *dsfield,
 711				     int *encap_limit)
 712{
 713	struct ip6_tnl *t = netdev_priv(dev);
 714
 715	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 716		*encap_limit = t->parms.encap_limit;
 717
 718	memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 719
 720	if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 721		*dsfield = 0;
 722	else
 723		*dsfield = ip6_tclass(t->parms.flowinfo);
 724
 725	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 726		fl6->flowi6_mark = skb->mark;
 727	else
 728		fl6->flowi6_mark = t->parms.fwmark;
 729
 730	fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 731
 732	return 0;
 733}
 734
 735static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
 736{
 737	struct ip_tunnel_info *tun_info;
 738
 739	tun_info = skb_tunnel_info(skb);
 740	if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
 741		return ERR_PTR(-EINVAL);
 742
 743	return tun_info;
 744}
 745
 746static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 747			       struct net_device *dev, __u8 dsfield,
 748			       struct flowi6 *fl6, int encap_limit,
 749			       __u32 *pmtu, __be16 proto)
 750{
 751	struct ip6_tnl *tunnel = netdev_priv(dev);
 752	IP_TUNNEL_DECLARE_FLAGS(flags);
 753	__be16 protocol;
 
 754
 755	if (dev->type == ARPHRD_ETHER)
 756		IPCB(skb)->flags = 0;
 757
 758	if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 759		fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 760	else
 761		fl6->daddr = tunnel->parms.raddr;
 762
 763	/* Push GRE header. */
 764	protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 765
 766	if (tunnel->parms.collect_md) {
 767		struct ip_tunnel_info *tun_info;
 768		const struct ip_tunnel_key *key;
 769		int tun_hlen;
 770
 771		tun_info = skb_tunnel_info_txcheck(skb);
 772		if (IS_ERR(tun_info) ||
 773		    unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 774			return -EINVAL;
 775
 776		key = &tun_info->key;
 777		memset(fl6, 0, sizeof(*fl6));
 778		fl6->flowi6_proto = IPPROTO_GRE;
 779		fl6->daddr = key->u.ipv6.dst;
 780		fl6->flowlabel = key->label;
 781		fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 782		fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
 783
 784		dsfield = key->tos;
 785		ip_tunnel_flags_zero(flags);
 786		__set_bit(IP_TUNNEL_CSUM_BIT, flags);
 787		__set_bit(IP_TUNNEL_KEY_BIT, flags);
 788		__set_bit(IP_TUNNEL_SEQ_BIT, flags);
 789		ip_tunnel_flags_and(flags, flags, key->tun_flags);
 790		tun_hlen = gre_calc_hlen(flags);
 791
 792		if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
 793			return -ENOMEM;
 794
 795		gre_build_header(skb, tun_hlen,
 796				 flags, protocol,
 797				 tunnel_id_to_key32(tun_info->key.tun_id),
 798				 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
 799				 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
 800				 0);
 801
 802	} else {
 803		if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 804			return -ENOMEM;
 805
 806		ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
 807
 808		gre_build_header(skb, tunnel->tun_hlen, flags,
 809				 protocol, tunnel->parms.o_key,
 810				 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
 811				 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
 812				 0);
 813	}
 814
 815	return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 816			    NEXTHDR_GRE);
 817}
 818
 819static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 820{
 821	struct ip6_tnl *t = netdev_priv(dev);
 822	int encap_limit = -1;
 823	struct flowi6 fl6;
 824	__u8 dsfield = 0;
 825	__u32 mtu;
 826	int err;
 827
 828	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 829
 830	if (!t->parms.collect_md)
 831		prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 832					 &dsfield, &encap_limit);
 833
 834	err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 835						t->parms.o_flags));
 836	if (err)
 837		return -1;
 838
 839	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 840			  skb->protocol);
 841	if (err != 0) {
 842		/* XXX: send ICMP error even if DF is not set. */
 843		if (err == -EMSGSIZE)
 844			icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 845				      htonl(mtu));
 846		return -1;
 847	}
 848
 849	return 0;
 850}
 851
 852static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 853{
 854	struct ip6_tnl *t = netdev_priv(dev);
 855	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 856	int encap_limit = -1;
 857	struct flowi6 fl6;
 858	__u8 dsfield = 0;
 859	__u32 mtu;
 860	int err;
 861
 862	if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 863		return -1;
 864
 865	if (!t->parms.collect_md &&
 866	    prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 867		return -1;
 868
 869	if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 870					      t->parms.o_flags)))
 871		return -1;
 872
 873	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 874			  &mtu, skb->protocol);
 875	if (err != 0) {
 876		if (err == -EMSGSIZE)
 877			icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 878		return -1;
 879	}
 880
 881	return 0;
 882}
 883
 884static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 885{
 886	struct ip6_tnl *t = netdev_priv(dev);
 887	int encap_limit = -1;
 888	struct flowi6 fl6;
 889	__u8 dsfield = 0;
 890	__u32 mtu;
 891	int err;
 892
 893	if (!t->parms.collect_md &&
 894	    prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
 895		return -1;
 896
 897	err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 898						t->parms.o_flags));
 899	if (err)
 900		return err;
 901	err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
 902
 903	return err;
 904}
 905
 906static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 907	struct net_device *dev)
 908{
 909	struct ip6_tnl *t = netdev_priv(dev);
 910	__be16 payload_protocol;
 911	int ret;
 912
 913	if (!pskb_inet_may_pull(skb))
 914		goto tx_err;
 915
 916	if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 917		goto tx_err;
 918
 919	payload_protocol = skb_protocol(skb, true);
 920	switch (payload_protocol) {
 921	case htons(ETH_P_IP):
 922		ret = ip6gre_xmit_ipv4(skb, dev);
 923		break;
 924	case htons(ETH_P_IPV6):
 925		ret = ip6gre_xmit_ipv6(skb, dev);
 926		break;
 927	default:
 928		ret = ip6gre_xmit_other(skb, dev);
 929		break;
 930	}
 931
 932	if (ret < 0)
 933		goto tx_err;
 934
 935	return NETDEV_TX_OK;
 936
 937tx_err:
 938	if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
 939		DEV_STATS_INC(dev, tx_errors);
 940	DEV_STATS_INC(dev, tx_dropped);
 941	kfree_skb(skb);
 942	return NETDEV_TX_OK;
 943}
 944
 945static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 946					 struct net_device *dev)
 947{
 948	struct ip_tunnel_info *tun_info = NULL;
 949	struct ip6_tnl *t = netdev_priv(dev);
 950	struct dst_entry *dst = skb_dst(skb);
 951	IP_TUNNEL_DECLARE_FLAGS(flags) = { };
 952	bool truncate = false;
 953	int encap_limit = -1;
 954	__u8 dsfield = false;
 955	struct flowi6 fl6;
 956	int err = -EINVAL;
 957	__be16 proto;
 958	__u32 mtu;
 959	int nhoff;
 960
 961	if (!pskb_inet_may_pull(skb))
 962		goto tx_err;
 963
 964	if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 965		goto tx_err;
 966
 967	if (gre_handle_offloads(skb, false))
 968		goto tx_err;
 969
 970	if (skb->len > dev->mtu + dev->hard_header_len) {
 971		if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
 972			goto tx_err;
 973		truncate = true;
 974	}
 975
 976	nhoff = skb_network_offset(skb);
 977	if (skb->protocol == htons(ETH_P_IP) &&
 978	    (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 979		truncate = true;
 980
 981	if (skb->protocol == htons(ETH_P_IPV6)) {
 982		int thoff;
 983
 984		if (skb_transport_header_was_set(skb))
 985			thoff = skb_transport_offset(skb);
 986		else
 987			thoff = nhoff + sizeof(struct ipv6hdr);
 988		if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
 989			truncate = true;
 990	}
 991
 992	if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 993		goto tx_err;
 994
 995	__clear_bit(IP_TUNNEL_KEY_BIT, t->parms.o_flags);
 996	IPCB(skb)->flags = 0;
 997
 998	/* For collect_md mode, derive fl6 from the tunnel key,
 999	 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
1000	 */
1001	if (t->parms.collect_md) {
1002		const struct ip_tunnel_key *key;
1003		struct erspan_metadata *md;
1004		__be32 tun_id;
1005
1006		tun_info = skb_tunnel_info_txcheck(skb);
1007		if (IS_ERR(tun_info) ||
1008		    unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1009			goto tx_err;
1010
1011		key = &tun_info->key;
1012		memset(&fl6, 0, sizeof(fl6));
1013		fl6.flowi6_proto = IPPROTO_GRE;
1014		fl6.daddr = key->u.ipv6.dst;
1015		fl6.flowlabel = key->label;
1016		fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1017		fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1018
1019		dsfield = key->tos;
1020		if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
1021			      tun_info->key.tun_flags))
1022			goto tx_err;
1023		if (tun_info->options_len < sizeof(*md))
1024			goto tx_err;
1025		md = ip_tunnel_info_opts(tun_info);
1026
1027		tun_id = tunnel_id_to_key32(key->tun_id);
1028		if (md->version == 1) {
1029			erspan_build_header(skb,
1030					    ntohl(tun_id),
1031					    ntohl(md->u.index), truncate,
1032					    false);
1033			proto = htons(ETH_P_ERSPAN);
1034		} else if (md->version == 2) {
1035			erspan_build_header_v2(skb,
1036					       ntohl(tun_id),
1037					       md->u.md2.dir,
1038					       get_hwid(&md->u.md2),
1039					       truncate, false);
1040			proto = htons(ETH_P_ERSPAN2);
1041		} else {
1042			goto tx_err;
1043		}
1044	} else {
1045		switch (skb->protocol) {
1046		case htons(ETH_P_IP):
1047			memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1048			prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1049						 &dsfield, &encap_limit);
1050			break;
1051		case htons(ETH_P_IPV6):
1052			if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1053				goto tx_err;
1054			if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1055						     &dsfield, &encap_limit))
1056				goto tx_err;
1057			break;
1058		default:
1059			memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1060			break;
1061		}
1062
1063		if (t->parms.erspan_ver == 1) {
1064			erspan_build_header(skb, ntohl(t->parms.o_key),
1065					    t->parms.index,
1066					    truncate, false);
1067			proto = htons(ETH_P_ERSPAN);
1068		} else if (t->parms.erspan_ver == 2) {
1069			erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1070					       t->parms.dir,
1071					       t->parms.hwid,
1072					       truncate, false);
1073			proto = htons(ETH_P_ERSPAN2);
1074		} else {
1075			goto tx_err;
1076		}
1077
1078		fl6.daddr = t->parms.raddr;
1079	}
1080
1081	/* Push GRE header. */
1082	__set_bit(IP_TUNNEL_SEQ_BIT, flags);
1083	gre_build_header(skb, 8, flags, proto, 0,
1084			 htonl(atomic_fetch_inc(&t->o_seqno)));
1085
1086	/* TooBig packet may have updated dst->dev's mtu */
1087	if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1088		dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1089
1090	err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1091			   NEXTHDR_GRE);
1092	if (err != 0) {
1093		/* XXX: send ICMP error even if DF is not set. */
1094		if (err == -EMSGSIZE) {
1095			if (skb->protocol == htons(ETH_P_IP))
1096				icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1097					      ICMP_FRAG_NEEDED, htonl(mtu));
1098			else
1099				icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1100		}
1101
1102		goto tx_err;
1103	}
1104	return NETDEV_TX_OK;
1105
1106tx_err:
1107	if (!IS_ERR(tun_info))
1108		DEV_STATS_INC(dev, tx_errors);
1109	DEV_STATS_INC(dev, tx_dropped);
1110	kfree_skb(skb);
1111	return NETDEV_TX_OK;
1112}
1113
1114static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1115{
1116	struct net_device *dev = t->dev;
1117	struct __ip6_tnl_parm *p = &t->parms;
1118	struct flowi6 *fl6 = &t->fl.u.ip6;
1119
1120	if (dev->type != ARPHRD_ETHER) {
1121		__dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1122		memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1123	}
1124
1125	/* Set up flowi template */
1126	fl6->saddr = p->laddr;
1127	fl6->daddr = p->raddr;
1128	fl6->flowi6_oif = p->link;
1129	fl6->flowlabel = 0;
1130	fl6->flowi6_proto = IPPROTO_GRE;
1131	fl6->fl6_gre_key = t->parms.o_key;
1132
1133	if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1134		fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1135	if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1136		fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1137
1138	p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1139	p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1140
1141	if (p->flags&IP6_TNL_F_CAP_XMIT &&
1142			p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1143		dev->flags |= IFF_POINTOPOINT;
1144	else
1145		dev->flags &= ~IFF_POINTOPOINT;
1146}
1147
1148static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1149					 int t_hlen)
1150{
1151	const struct __ip6_tnl_parm *p = &t->parms;
1152	struct net_device *dev = t->dev;
1153
1154	if (p->flags & IP6_TNL_F_CAP_XMIT) {
1155		int strict = (ipv6_addr_type(&p->raddr) &
1156			      (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1157
1158		struct rt6_info *rt = rt6_lookup(t->net,
1159						 &p->raddr, &p->laddr,
1160						 p->link, NULL, strict);
1161
1162		if (!rt)
1163			return;
1164
1165		if (rt->dst.dev) {
1166			unsigned short dst_len = rt->dst.dev->hard_header_len +
1167						 t_hlen;
1168
1169			if (t->dev->header_ops)
1170				dev->hard_header_len = dst_len;
1171			else
1172				dev->needed_headroom = dst_len;
1173
1174			if (set_mtu) {
1175				int mtu = rt->dst.dev->mtu - t_hlen;
1176
1177				if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1178					mtu -= 8;
1179				if (dev->type == ARPHRD_ETHER)
1180					mtu -= ETH_HLEN;
1181
1182				if (mtu < IPV6_MIN_MTU)
1183					mtu = IPV6_MIN_MTU;
1184				WRITE_ONCE(dev->mtu, mtu);
1185			}
1186		}
1187		ip6_rt_put(rt);
1188	}
1189}
1190
1191static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1192{
1193	int t_hlen;
1194
1195	tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1196	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1197
1198	t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1199
1200	if (tunnel->dev->header_ops)
1201		tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1202	else
1203		tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1204
1205	return t_hlen;
1206}
1207
1208static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1209{
1210	ip6gre_tnl_link_config_common(t);
1211	ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1212}
1213
1214static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1215				     const struct __ip6_tnl_parm *p)
1216{
1217	t->parms.laddr = p->laddr;
1218	t->parms.raddr = p->raddr;
1219	t->parms.flags = p->flags;
1220	t->parms.hop_limit = p->hop_limit;
1221	t->parms.encap_limit = p->encap_limit;
1222	t->parms.flowinfo = p->flowinfo;
1223	t->parms.link = p->link;
1224	t->parms.proto = p->proto;
1225	t->parms.i_key = p->i_key;
1226	t->parms.o_key = p->o_key;
1227	ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
1228	ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
1229	t->parms.fwmark = p->fwmark;
1230	t->parms.erspan_ver = p->erspan_ver;
1231	t->parms.index = p->index;
1232	t->parms.dir = p->dir;
1233	t->parms.hwid = p->hwid;
1234	dst_cache_reset(&t->dst_cache);
1235}
1236
1237static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1238			     int set_mtu)
1239{
1240	ip6gre_tnl_copy_tnl_parm(t, p);
1241	ip6gre_tnl_link_config(t, set_mtu);
1242	return 0;
1243}
1244
1245static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1246	const struct ip6_tnl_parm2 *u)
1247{
1248	p->laddr = u->laddr;
1249	p->raddr = u->raddr;
1250	p->flags = u->flags;
1251	p->hop_limit = u->hop_limit;
1252	p->encap_limit = u->encap_limit;
1253	p->flowinfo = u->flowinfo;
1254	p->link = u->link;
1255	p->i_key = u->i_key;
1256	p->o_key = u->o_key;
1257	gre_flags_to_tnl_flags(p->i_flags, u->i_flags);
1258	gre_flags_to_tnl_flags(p->o_flags, u->o_flags);
1259	memcpy(p->name, u->name, sizeof(u->name));
1260}
1261
1262static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1263	const struct __ip6_tnl_parm *p)
1264{
1265	u->proto = IPPROTO_GRE;
1266	u->laddr = p->laddr;
1267	u->raddr = p->raddr;
1268	u->flags = p->flags;
1269	u->hop_limit = p->hop_limit;
1270	u->encap_limit = p->encap_limit;
1271	u->flowinfo = p->flowinfo;
1272	u->link = p->link;
1273	u->i_key = p->i_key;
1274	u->o_key = p->o_key;
1275	u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1276	u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1277	memcpy(u->name, p->name, sizeof(u->name));
1278}
1279
1280static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1281					struct ifreq *ifr, void __user *data,
1282					int cmd)
1283{
1284	int err = 0;
1285	struct ip6_tnl_parm2 p;
1286	struct __ip6_tnl_parm p1;
1287	struct ip6_tnl *t = netdev_priv(dev);
1288	struct net *net = t->net;
1289	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1290
1291	memset(&p1, 0, sizeof(p1));
1292
1293	switch (cmd) {
1294	case SIOCGETTUNNEL:
1295		if (dev == ign->fb_tunnel_dev) {
1296			if (copy_from_user(&p, data, sizeof(p))) {
1297				err = -EFAULT;
1298				break;
1299			}
1300			ip6gre_tnl_parm_from_user(&p1, &p);
1301			t = ip6gre_tunnel_locate(net, &p1, 0);
1302			if (!t)
1303				t = netdev_priv(dev);
1304		}
1305		memset(&p, 0, sizeof(p));
1306		ip6gre_tnl_parm_to_user(&p, &t->parms);
1307		if (copy_to_user(data, &p, sizeof(p)))
1308			err = -EFAULT;
1309		break;
1310
1311	case SIOCADDTUNNEL:
1312	case SIOCCHGTUNNEL:
1313		err = -EPERM;
1314		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1315			goto done;
1316
1317		err = -EFAULT;
1318		if (copy_from_user(&p, data, sizeof(p)))
1319			goto done;
1320
1321		err = -EINVAL;
1322		if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1323			goto done;
1324
1325		if (!(p.i_flags&GRE_KEY))
1326			p.i_key = 0;
1327		if (!(p.o_flags&GRE_KEY))
1328			p.o_key = 0;
1329
1330		ip6gre_tnl_parm_from_user(&p1, &p);
1331		t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1332
1333		if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1334			if (t) {
1335				if (t->dev != dev) {
1336					err = -EEXIST;
1337					break;
1338				}
1339			} else {
1340				t = netdev_priv(dev);
1341
1342				ip6gre_tunnel_unlink(ign, t);
1343				synchronize_net();
1344				ip6gre_tnl_change(t, &p1, 1);
1345				ip6gre_tunnel_link(ign, t);
1346				netdev_state_change(dev);
1347			}
1348		}
1349
1350		if (t) {
1351			err = 0;
1352
1353			memset(&p, 0, sizeof(p));
1354			ip6gre_tnl_parm_to_user(&p, &t->parms);
1355			if (copy_to_user(data, &p, sizeof(p)))
1356				err = -EFAULT;
1357		} else
1358			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1359		break;
1360
1361	case SIOCDELTUNNEL:
1362		err = -EPERM;
1363		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1364			goto done;
1365
1366		if (dev == ign->fb_tunnel_dev) {
1367			err = -EFAULT;
1368			if (copy_from_user(&p, data, sizeof(p)))
1369				goto done;
1370			err = -ENOENT;
1371			ip6gre_tnl_parm_from_user(&p1, &p);
1372			t = ip6gre_tunnel_locate(net, &p1, 0);
1373			if (!t)
1374				goto done;
1375			err = -EPERM;
1376			if (t == netdev_priv(ign->fb_tunnel_dev))
1377				goto done;
1378			dev = t->dev;
1379		}
1380		unregister_netdevice(dev);
1381		err = 0;
1382		break;
1383
1384	default:
1385		err = -EINVAL;
1386	}
1387
1388done:
1389	return err;
1390}
1391
1392static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1393			 unsigned short type, const void *daddr,
1394			 const void *saddr, unsigned int len)
1395{
1396	struct ip6_tnl *t = netdev_priv(dev);
1397	struct ipv6hdr *ipv6h;
1398	__be16 *p;
1399
1400	ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1401	ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1402						  t->fl.u.ip6.flowlabel,
1403						  true, &t->fl.u.ip6));
1404	ipv6h->hop_limit = t->parms.hop_limit;
1405	ipv6h->nexthdr = NEXTHDR_GRE;
1406	ipv6h->saddr = t->parms.laddr;
1407	ipv6h->daddr = t->parms.raddr;
1408
1409	p = (__be16 *)(ipv6h + 1);
1410	p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags);
1411	p[1] = htons(type);
1412
1413	/*
1414	 *	Set the source hardware address.
1415	 */
1416
1417	if (saddr)
1418		memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1419	if (daddr)
1420		memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1421	if (!ipv6_addr_any(&ipv6h->daddr))
1422		return t->hlen;
1423
1424	return -t->hlen;
1425}
1426
1427static const struct header_ops ip6gre_header_ops = {
1428	.create	= ip6gre_header,
1429};
1430
1431static const struct net_device_ops ip6gre_netdev_ops = {
1432	.ndo_init		= ip6gre_tunnel_init,
1433	.ndo_uninit		= ip6gre_tunnel_uninit,
1434	.ndo_start_xmit		= ip6gre_tunnel_xmit,
1435	.ndo_siocdevprivate	= ip6gre_tunnel_siocdevprivate,
1436	.ndo_change_mtu		= ip6_tnl_change_mtu,
 
1437	.ndo_get_iflink		= ip6_tnl_get_iflink,
1438};
1439
1440static void ip6gre_dev_free(struct net_device *dev)
1441{
1442	struct ip6_tnl *t = netdev_priv(dev);
1443
1444	gro_cells_destroy(&t->gro_cells);
1445	dst_cache_destroy(&t->dst_cache);
 
1446}
1447
1448static void ip6gre_tunnel_setup(struct net_device *dev)
1449{
1450	dev->netdev_ops = &ip6gre_netdev_ops;
1451	dev->needs_free_netdev = true;
1452	dev->priv_destructor = ip6gre_dev_free;
1453
1454	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1455	dev->type = ARPHRD_IP6GRE;
1456
1457	dev->flags |= IFF_NOARP;
1458	dev->addr_len = sizeof(struct in6_addr);
1459	netif_keep_dst(dev);
1460	/* This perm addr will be used as interface identifier by IPv6 */
1461	dev->addr_assign_type = NET_ADDR_RANDOM;
1462	eth_random_addr(dev->perm_addr);
1463}
1464
1465#define GRE6_FEATURES (NETIF_F_SG |		\
1466		       NETIF_F_FRAGLIST |	\
1467		       NETIF_F_HIGHDMA |	\
1468		       NETIF_F_HW_CSUM)
1469
1470static void ip6gre_tnl_init_features(struct net_device *dev)
1471{
1472	struct ip6_tnl *nt = netdev_priv(dev);
 
1473
1474	dev->features		|= GRE6_FEATURES;
1475	dev->hw_features	|= GRE6_FEATURES;
1476
 
 
1477	/* TCP offload with GRE SEQ is not supported, nor can we support 2
1478	 * levels of outer headers requiring an update.
1479	 */
1480	if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags))
1481		return;
1482	if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) &&
1483	    nt->encap.type != TUNNEL_ENCAP_NONE)
1484		return;
1485
1486	dev->features |= NETIF_F_GSO_SOFTWARE;
1487	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1488
1489	dev->lltx = true;
1490}
1491
1492static int ip6gre_tunnel_init_common(struct net_device *dev)
1493{
1494	struct ip6_tnl *tunnel;
1495	int ret;
1496	int t_hlen;
1497
1498	tunnel = netdev_priv(dev);
1499
1500	tunnel->dev = dev;
1501	tunnel->net = dev_net(dev);
1502	strcpy(tunnel->parms.name, dev->name);
1503
 
 
 
 
1504	ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1505	if (ret)
1506		return ret;
1507
1508	ret = gro_cells_init(&tunnel->gro_cells, dev);
1509	if (ret)
1510		goto cleanup_dst_cache_init;
1511
1512	t_hlen = ip6gre_calc_hlen(tunnel);
1513	dev->mtu = ETH_DATA_LEN - t_hlen;
1514	if (dev->type == ARPHRD_ETHER)
1515		dev->mtu -= ETH_HLEN;
1516	if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1517		dev->mtu -= 8;
1518
1519	if (tunnel->parms.collect_md) {
1520		netif_keep_dst(dev);
1521	}
1522	ip6gre_tnl_init_features(dev);
1523
1524	netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1525	netdev_lockdep_set_classes(dev);
1526	return 0;
1527
1528cleanup_dst_cache_init:
1529	dst_cache_destroy(&tunnel->dst_cache);
 
 
 
1530	return ret;
1531}
1532
1533static int ip6gre_tunnel_init(struct net_device *dev)
1534{
1535	struct ip6_tnl *tunnel;
1536	int ret;
1537
1538	ret = ip6gre_tunnel_init_common(dev);
1539	if (ret)
1540		return ret;
1541
1542	tunnel = netdev_priv(dev);
1543
1544	if (tunnel->parms.collect_md)
1545		return 0;
1546
1547	__dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1548	memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1549
1550	if (ipv6_addr_any(&tunnel->parms.raddr))
1551		dev->header_ops = &ip6gre_header_ops;
1552
1553	return 0;
1554}
1555
1556static void ip6gre_fb_tunnel_init(struct net_device *dev)
1557{
1558	struct ip6_tnl *tunnel = netdev_priv(dev);
1559
1560	tunnel->dev = dev;
1561	tunnel->net = dev_net(dev);
1562	strcpy(tunnel->parms.name, dev->name);
1563
1564	tunnel->hlen		= sizeof(struct ipv6hdr) + 4;
1565}
1566
1567static struct inet6_protocol ip6gre_protocol __read_mostly = {
1568	.handler     = gre_rcv,
1569	.err_handler = ip6gre_err,
1570	.flags       = INET6_PROTO_FINAL,
1571};
1572
1573static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1574{
1575	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1576	struct net_device *dev, *aux;
1577	int prio;
1578
1579	for_each_netdev_safe(net, dev, aux)
1580		if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1581		    dev->rtnl_link_ops == &ip6gre_tap_ops ||
1582		    dev->rtnl_link_ops == &ip6erspan_tap_ops)
1583			unregister_netdevice_queue(dev, head);
1584
1585	for (prio = 0; prio < 4; prio++) {
1586		int h;
1587		for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1588			struct ip6_tnl *t;
1589
1590			t = rtnl_dereference(ign->tunnels[prio][h]);
1591
1592			while (t) {
1593				/* If dev is in the same netns, it has already
1594				 * been added to the list by the previous loop.
1595				 */
1596				if (!net_eq(dev_net(t->dev), net))
1597					unregister_netdevice_queue(t->dev,
1598								   head);
1599				t = rtnl_dereference(t->next);
1600			}
1601		}
1602	}
1603}
1604
1605static int __net_init ip6gre_init_net(struct net *net)
1606{
1607	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1608	struct net_device *ndev;
1609	int err;
1610
1611	if (!net_has_fallback_tunnels(net))
1612		return 0;
1613	ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1614			    NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1615	if (!ndev) {
1616		err = -ENOMEM;
1617		goto err_alloc_dev;
1618	}
1619	ign->fb_tunnel_dev = ndev;
1620	dev_net_set(ign->fb_tunnel_dev, net);
1621	/* FB netdevice is special: we have one, and only one per netns.
1622	 * Allowing to move it to another netns is clearly unsafe.
1623	 */
1624	ign->fb_tunnel_dev->netns_local = true;
 
1625
1626	ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1627	ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1628
1629	err = register_netdev(ign->fb_tunnel_dev);
1630	if (err)
1631		goto err_reg_dev;
1632
1633	rcu_assign_pointer(ign->tunnels_wc[0],
1634			   netdev_priv(ign->fb_tunnel_dev));
1635	return 0;
1636
1637err_reg_dev:
1638	free_netdev(ndev);
1639err_alloc_dev:
1640	return err;
1641}
1642
1643static void __net_exit ip6gre_exit_batch_rtnl(struct list_head *net_list,
1644					      struct list_head *dev_to_kill)
1645{
1646	struct net *net;
 
1647
1648	ASSERT_RTNL();
1649	list_for_each_entry(net, net_list, exit_list)
1650		ip6gre_destroy_tunnels(net, dev_to_kill);
 
 
1651}
1652
1653static struct pernet_operations ip6gre_net_ops = {
1654	.init = ip6gre_init_net,
1655	.exit_batch_rtnl = ip6gre_exit_batch_rtnl,
1656	.id   = &ip6gre_net_id,
1657	.size = sizeof(struct ip6gre_net),
1658};
1659
1660static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1661				  struct netlink_ext_ack *extack)
1662{
1663	__be16 flags;
1664
1665	if (!data)
1666		return 0;
1667
1668	flags = 0;
1669	if (data[IFLA_GRE_IFLAGS])
1670		flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1671	if (data[IFLA_GRE_OFLAGS])
1672		flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1673	if (flags & (GRE_VERSION|GRE_ROUTING))
1674		return -EINVAL;
1675
1676	return 0;
1677}
1678
1679static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1680			       struct netlink_ext_ack *extack)
1681{
1682	struct in6_addr daddr;
1683
1684	if (tb[IFLA_ADDRESS]) {
1685		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1686			return -EINVAL;
1687		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1688			return -EADDRNOTAVAIL;
1689	}
1690
1691	if (!data)
1692		goto out;
1693
1694	if (data[IFLA_GRE_REMOTE]) {
1695		daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1696		if (ipv6_addr_any(&daddr))
1697			return -EINVAL;
1698	}
1699
1700out:
1701	return ip6gre_tunnel_validate(tb, data, extack);
1702}
1703
1704static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1705				  struct netlink_ext_ack *extack)
1706{
1707	__be16 flags = 0;
1708	int ret, ver = 0;
1709
1710	if (!data)
1711		return 0;
1712
1713	ret = ip6gre_tap_validate(tb, data, extack);
1714	if (ret)
1715		return ret;
1716
1717	/* ERSPAN should only have GRE sequence and key flag */
1718	if (data[IFLA_GRE_OFLAGS])
1719		flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1720	if (data[IFLA_GRE_IFLAGS])
1721		flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1722	if (!data[IFLA_GRE_COLLECT_METADATA] &&
1723	    flags != (GRE_SEQ | GRE_KEY))
1724		return -EINVAL;
1725
1726	/* ERSPAN Session ID only has 10-bit. Since we reuse
1727	 * 32-bit key field as ID, check it's range.
1728	 */
1729	if (data[IFLA_GRE_IKEY] &&
1730	    (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1731		return -EINVAL;
1732
1733	if (data[IFLA_GRE_OKEY] &&
1734	    (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1735		return -EINVAL;
1736
1737	if (data[IFLA_GRE_ERSPAN_VER]) {
1738		ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1739		if (ver != 1 && ver != 2)
1740			return -EINVAL;
1741	}
1742
1743	if (ver == 1) {
1744		if (data[IFLA_GRE_ERSPAN_INDEX]) {
1745			u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1746
1747			if (index & ~INDEX_MASK)
1748				return -EINVAL;
1749		}
1750	} else if (ver == 2) {
1751		if (data[IFLA_GRE_ERSPAN_DIR]) {
1752			u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1753
1754			if (dir & ~(DIR_MASK >> DIR_OFFSET))
1755				return -EINVAL;
1756		}
1757
1758		if (data[IFLA_GRE_ERSPAN_HWID]) {
1759			u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1760
1761			if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1762				return -EINVAL;
1763		}
1764	}
1765
1766	return 0;
1767}
1768
1769static void ip6erspan_set_version(struct nlattr *data[],
1770				  struct __ip6_tnl_parm *parms)
1771{
1772	if (!data)
1773		return;
1774
1775	parms->erspan_ver = 1;
1776	if (data[IFLA_GRE_ERSPAN_VER])
1777		parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1778
1779	if (parms->erspan_ver == 1) {
1780		if (data[IFLA_GRE_ERSPAN_INDEX])
1781			parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1782	} else if (parms->erspan_ver == 2) {
1783		if (data[IFLA_GRE_ERSPAN_DIR])
1784			parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1785		if (data[IFLA_GRE_ERSPAN_HWID])
1786			parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1787	}
1788}
1789
1790static void ip6gre_netlink_parms(struct nlattr *data[],
1791				struct __ip6_tnl_parm *parms)
1792{
1793	memset(parms, 0, sizeof(*parms));
1794
1795	if (!data)
1796		return;
1797
1798	if (data[IFLA_GRE_LINK])
1799		parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1800
1801	if (data[IFLA_GRE_IFLAGS])
1802		gre_flags_to_tnl_flags(parms->i_flags,
1803				       nla_get_be16(data[IFLA_GRE_IFLAGS]));
1804
1805	if (data[IFLA_GRE_OFLAGS])
1806		gre_flags_to_tnl_flags(parms->o_flags,
1807				       nla_get_be16(data[IFLA_GRE_OFLAGS]));
1808
1809	if (data[IFLA_GRE_IKEY])
1810		parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1811
1812	if (data[IFLA_GRE_OKEY])
1813		parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1814
1815	if (data[IFLA_GRE_LOCAL])
1816		parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1817
1818	if (data[IFLA_GRE_REMOTE])
1819		parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1820
1821	if (data[IFLA_GRE_TTL])
1822		parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1823
1824	if (data[IFLA_GRE_ENCAP_LIMIT])
1825		parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1826
1827	if (data[IFLA_GRE_FLOWINFO])
1828		parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1829
1830	if (data[IFLA_GRE_FLAGS])
1831		parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1832
1833	if (data[IFLA_GRE_FWMARK])
1834		parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1835
1836	if (data[IFLA_GRE_COLLECT_METADATA])
1837		parms->collect_md = true;
1838}
1839
1840static int ip6gre_tap_init(struct net_device *dev)
1841{
1842	int ret;
1843
1844	ret = ip6gre_tunnel_init_common(dev);
1845	if (ret)
1846		return ret;
1847
1848	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1849
1850	return 0;
1851}
1852
1853static const struct net_device_ops ip6gre_tap_netdev_ops = {
1854	.ndo_init = ip6gre_tap_init,
1855	.ndo_uninit = ip6gre_tunnel_uninit,
1856	.ndo_start_xmit = ip6gre_tunnel_xmit,
1857	.ndo_set_mac_address = eth_mac_addr,
1858	.ndo_validate_addr = eth_validate_addr,
1859	.ndo_change_mtu = ip6_tnl_change_mtu,
 
1860	.ndo_get_iflink = ip6_tnl_get_iflink,
1861};
1862
1863static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1864{
1865	int t_hlen;
1866
1867	tunnel->tun_hlen = 8;
1868	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1869		       erspan_hdr_len(tunnel->parms.erspan_ver);
1870
1871	t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1872	tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1873	return t_hlen;
1874}
1875
1876static int ip6erspan_tap_init(struct net_device *dev)
1877{
1878	struct ip6_tnl *tunnel;
1879	int t_hlen;
1880	int ret;
1881
1882	tunnel = netdev_priv(dev);
1883
1884	tunnel->dev = dev;
1885	tunnel->net = dev_net(dev);
1886	strcpy(tunnel->parms.name, dev->name);
1887
 
 
 
 
1888	ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1889	if (ret)
1890		return ret;
1891
1892	ret = gro_cells_init(&tunnel->gro_cells, dev);
1893	if (ret)
1894		goto cleanup_dst_cache_init;
1895
1896	t_hlen = ip6erspan_calc_hlen(tunnel);
1897	dev->mtu = ETH_DATA_LEN - t_hlen;
1898	if (dev->type == ARPHRD_ETHER)
1899		dev->mtu -= ETH_HLEN;
1900	if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1901		dev->mtu -= 8;
1902
1903	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1904	ip6erspan_tnl_link_config(tunnel, 1);
1905
1906	netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1907	netdev_lockdep_set_classes(dev);
1908	return 0;
1909
1910cleanup_dst_cache_init:
1911	dst_cache_destroy(&tunnel->dst_cache);
 
 
 
1912	return ret;
1913}
1914
1915static const struct net_device_ops ip6erspan_netdev_ops = {
1916	.ndo_init =		ip6erspan_tap_init,
1917	.ndo_uninit =		ip6erspan_tunnel_uninit,
1918	.ndo_start_xmit =	ip6erspan_tunnel_xmit,
1919	.ndo_set_mac_address =	eth_mac_addr,
1920	.ndo_validate_addr =	eth_validate_addr,
1921	.ndo_change_mtu =	ip6_tnl_change_mtu,
 
1922	.ndo_get_iflink =	ip6_tnl_get_iflink,
1923};
1924
1925static void ip6gre_tap_setup(struct net_device *dev)
1926{
1927
1928	ether_setup(dev);
1929
1930	dev->max_mtu = 0;
1931	dev->netdev_ops = &ip6gre_tap_netdev_ops;
1932	dev->needs_free_netdev = true;
1933	dev->priv_destructor = ip6gre_dev_free;
1934
1935	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1936	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1937	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1938	netif_keep_dst(dev);
1939}
1940
1941static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1942				       struct ip_tunnel_encap *ipencap)
1943{
1944	bool ret = false;
1945
1946	memset(ipencap, 0, sizeof(*ipencap));
1947
1948	if (!data)
1949		return ret;
1950
1951	if (data[IFLA_GRE_ENCAP_TYPE]) {
1952		ret = true;
1953		ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1954	}
1955
1956	if (data[IFLA_GRE_ENCAP_FLAGS]) {
1957		ret = true;
1958		ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1959	}
1960
1961	if (data[IFLA_GRE_ENCAP_SPORT]) {
1962		ret = true;
1963		ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1964	}
1965
1966	if (data[IFLA_GRE_ENCAP_DPORT]) {
1967		ret = true;
1968		ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1969	}
1970
1971	return ret;
1972}
1973
1974static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1975				 struct nlattr *tb[], struct nlattr *data[],
1976				 struct netlink_ext_ack *extack)
1977{
1978	struct ip6_tnl *nt;
1979	struct ip_tunnel_encap ipencap;
1980	int err;
1981
1982	nt = netdev_priv(dev);
1983
1984	if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1985		int err = ip6_tnl_encap_setup(nt, &ipencap);
1986
1987		if (err < 0)
1988			return err;
1989	}
1990
1991	if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1992		eth_hw_addr_random(dev);
1993
1994	nt->dev = dev;
1995	nt->net = dev_net(dev);
1996
1997	err = register_netdevice(dev);
1998	if (err)
1999		goto out;
2000
2001	if (tb[IFLA_MTU])
2002		ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2003
2004out:
2005	return err;
2006}
2007
2008static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2009			  struct nlattr *tb[], struct nlattr *data[],
2010			  struct netlink_ext_ack *extack)
2011{
2012	struct ip6_tnl *nt = netdev_priv(dev);
2013	struct net *net = dev_net(dev);
2014	struct ip6gre_net *ign;
2015	int err;
2016
2017	ip6gre_netlink_parms(data, &nt->parms);
2018	ign = net_generic(net, ip6gre_net_id);
2019
2020	if (nt->parms.collect_md) {
2021		if (rtnl_dereference(ign->collect_md_tun))
2022			return -EEXIST;
2023	} else {
2024		if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2025			return -EEXIST;
2026	}
2027
2028	err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2029	if (!err) {
2030		ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2031		ip6gre_tunnel_link_md(ign, nt);
2032		ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2033	}
2034	return err;
2035}
2036
2037static struct ip6_tnl *
2038ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2039			 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2040			 struct netlink_ext_ack *extack)
2041{
2042	struct ip6_tnl *t, *nt = netdev_priv(dev);
2043	struct net *net = nt->net;
2044	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2045	struct ip_tunnel_encap ipencap;
2046
2047	if (dev == ign->fb_tunnel_dev)
2048		return ERR_PTR(-EINVAL);
2049
2050	if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2051		int err = ip6_tnl_encap_setup(nt, &ipencap);
2052
2053		if (err < 0)
2054			return ERR_PTR(err);
2055	}
2056
2057	ip6gre_netlink_parms(data, p_p);
2058
2059	t = ip6gre_tunnel_locate(net, p_p, 0);
2060
2061	if (t) {
2062		if (t->dev != dev)
2063			return ERR_PTR(-EEXIST);
2064	} else {
2065		t = nt;
2066	}
2067
2068	return t;
2069}
2070
2071static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2072			     struct nlattr *data[],
2073			     struct netlink_ext_ack *extack)
2074{
2075	struct ip6_tnl *t = netdev_priv(dev);
2076	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2077	struct __ip6_tnl_parm p;
2078
2079	t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2080	if (IS_ERR(t))
2081		return PTR_ERR(t);
2082
2083	ip6gre_tunnel_unlink_md(ign, t);
2084	ip6gre_tunnel_unlink(ign, t);
2085	ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2086	ip6gre_tunnel_link_md(ign, t);
2087	ip6gre_tunnel_link(ign, t);
2088	return 0;
2089}
2090
2091static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2092{
2093	struct net *net = dev_net(dev);
2094	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2095
2096	if (dev != ign->fb_tunnel_dev)
2097		unregister_netdevice_queue(dev, head);
2098}
2099
2100static size_t ip6gre_get_size(const struct net_device *dev)
2101{
2102	return
2103		/* IFLA_GRE_LINK */
2104		nla_total_size(4) +
2105		/* IFLA_GRE_IFLAGS */
2106		nla_total_size(2) +
2107		/* IFLA_GRE_OFLAGS */
2108		nla_total_size(2) +
2109		/* IFLA_GRE_IKEY */
2110		nla_total_size(4) +
2111		/* IFLA_GRE_OKEY */
2112		nla_total_size(4) +
2113		/* IFLA_GRE_LOCAL */
2114		nla_total_size(sizeof(struct in6_addr)) +
2115		/* IFLA_GRE_REMOTE */
2116		nla_total_size(sizeof(struct in6_addr)) +
2117		/* IFLA_GRE_TTL */
2118		nla_total_size(1) +
2119		/* IFLA_GRE_ENCAP_LIMIT */
2120		nla_total_size(1) +
2121		/* IFLA_GRE_FLOWINFO */
2122		nla_total_size(4) +
2123		/* IFLA_GRE_FLAGS */
2124		nla_total_size(4) +
2125		/* IFLA_GRE_ENCAP_TYPE */
2126		nla_total_size(2) +
2127		/* IFLA_GRE_ENCAP_FLAGS */
2128		nla_total_size(2) +
2129		/* IFLA_GRE_ENCAP_SPORT */
2130		nla_total_size(2) +
2131		/* IFLA_GRE_ENCAP_DPORT */
2132		nla_total_size(2) +
2133		/* IFLA_GRE_COLLECT_METADATA */
2134		nla_total_size(0) +
2135		/* IFLA_GRE_FWMARK */
2136		nla_total_size(4) +
2137		/* IFLA_GRE_ERSPAN_INDEX */
2138		nla_total_size(4) +
2139		0;
2140}
2141
2142static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2143{
2144	struct ip6_tnl *t = netdev_priv(dev);
2145	struct __ip6_tnl_parm *p = &t->parms;
2146	IP_TUNNEL_DECLARE_FLAGS(o_flags);
2147
2148	ip_tunnel_flags_copy(o_flags, p->o_flags);
2149
2150	if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2151		if (!p->collect_md)
2152			__set_bit(IP_TUNNEL_KEY_BIT, o_flags);
2153
2154		if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2155			goto nla_put_failure;
2156
2157		if (p->erspan_ver == 1) {
2158			if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2159				goto nla_put_failure;
2160		} else {
2161			if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2162				goto nla_put_failure;
2163			if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2164				goto nla_put_failure;
2165		}
2166	}
2167
2168	if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2169	    nla_put_be16(skb, IFLA_GRE_IFLAGS,
2170			 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2171	    nla_put_be16(skb, IFLA_GRE_OFLAGS,
2172			 gre_tnl_flags_to_gre_flags(o_flags)) ||
2173	    nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2174	    nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2175	    nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2176	    nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2177	    nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2178	    nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2179	    nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2180	    nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2181	    nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2182		goto nla_put_failure;
2183
2184	if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2185			t->encap.type) ||
2186	    nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2187			 t->encap.sport) ||
2188	    nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2189			 t->encap.dport) ||
2190	    nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2191			t->encap.flags))
2192		goto nla_put_failure;
2193
2194	if (p->collect_md) {
2195		if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2196			goto nla_put_failure;
2197	}
2198
2199	return 0;
2200
2201nla_put_failure:
2202	return -EMSGSIZE;
2203}
2204
2205static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2206	[IFLA_GRE_LINK]        = { .type = NLA_U32 },
2207	[IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2208	[IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2209	[IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2210	[IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2211	[IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2212	[IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2213	[IFLA_GRE_TTL]         = { .type = NLA_U8 },
2214	[IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2215	[IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2216	[IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2217	[IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2218	[IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2219	[IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2220	[IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2221	[IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2222	[IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2223	[IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2224	[IFLA_GRE_ERSPAN_VER]	= { .type = NLA_U8 },
2225	[IFLA_GRE_ERSPAN_DIR]	= { .type = NLA_U8 },
2226	[IFLA_GRE_ERSPAN_HWID]	= { .type = NLA_U16 },
2227};
2228
2229static void ip6erspan_tap_setup(struct net_device *dev)
2230{
2231	ether_setup(dev);
2232
2233	dev->max_mtu = 0;
2234	dev->netdev_ops = &ip6erspan_netdev_ops;
2235	dev->needs_free_netdev = true;
2236	dev->priv_destructor = ip6gre_dev_free;
2237
2238	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2239	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2240	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2241	netif_keep_dst(dev);
2242}
2243
2244static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2245			     struct nlattr *tb[], struct nlattr *data[],
2246			     struct netlink_ext_ack *extack)
2247{
2248	struct ip6_tnl *nt = netdev_priv(dev);
2249	struct net *net = dev_net(dev);
2250	struct ip6gre_net *ign;
2251	int err;
2252
2253	ip6gre_netlink_parms(data, &nt->parms);
2254	ip6erspan_set_version(data, &nt->parms);
2255	ign = net_generic(net, ip6gre_net_id);
2256
2257	if (nt->parms.collect_md) {
2258		if (rtnl_dereference(ign->collect_md_tun_erspan))
2259			return -EEXIST;
2260	} else {
2261		if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2262			return -EEXIST;
2263	}
2264
2265	err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2266	if (!err) {
2267		ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2268		ip6erspan_tunnel_link_md(ign, nt);
2269		ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2270	}
2271	return err;
2272}
2273
2274static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2275{
2276	ip6gre_tnl_link_config_common(t);
2277	ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2278}
2279
2280static int ip6erspan_tnl_change(struct ip6_tnl *t,
2281				const struct __ip6_tnl_parm *p, int set_mtu)
2282{
2283	ip6gre_tnl_copy_tnl_parm(t, p);
2284	ip6erspan_tnl_link_config(t, set_mtu);
2285	return 0;
2286}
2287
2288static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2289				struct nlattr *data[],
2290				struct netlink_ext_ack *extack)
2291{
2292	struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2293	struct __ip6_tnl_parm p;
2294	struct ip6_tnl *t;
2295
2296	t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2297	if (IS_ERR(t))
2298		return PTR_ERR(t);
2299
2300	ip6erspan_set_version(data, &p);
2301	ip6gre_tunnel_unlink_md(ign, t);
2302	ip6gre_tunnel_unlink(ign, t);
2303	ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2304	ip6erspan_tunnel_link_md(ign, t);
2305	ip6gre_tunnel_link(ign, t);
2306	return 0;
2307}
2308
2309static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2310	.kind		= "ip6gre",
2311	.maxtype	= IFLA_GRE_MAX,
2312	.policy		= ip6gre_policy,
2313	.priv_size	= sizeof(struct ip6_tnl),
2314	.setup		= ip6gre_tunnel_setup,
2315	.validate	= ip6gre_tunnel_validate,
2316	.newlink	= ip6gre_newlink,
2317	.changelink	= ip6gre_changelink,
2318	.dellink	= ip6gre_dellink,
2319	.get_size	= ip6gre_get_size,
2320	.fill_info	= ip6gre_fill_info,
2321	.get_link_net	= ip6_tnl_get_link_net,
2322};
2323
2324static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2325	.kind		= "ip6gretap",
2326	.maxtype	= IFLA_GRE_MAX,
2327	.policy		= ip6gre_policy,
2328	.priv_size	= sizeof(struct ip6_tnl),
2329	.setup		= ip6gre_tap_setup,
2330	.validate	= ip6gre_tap_validate,
2331	.newlink	= ip6gre_newlink,
2332	.changelink	= ip6gre_changelink,
2333	.get_size	= ip6gre_get_size,
2334	.fill_info	= ip6gre_fill_info,
2335	.get_link_net	= ip6_tnl_get_link_net,
2336};
2337
2338static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2339	.kind		= "ip6erspan",
2340	.maxtype	= IFLA_GRE_MAX,
2341	.policy		= ip6gre_policy,
2342	.priv_size	= sizeof(struct ip6_tnl),
2343	.setup		= ip6erspan_tap_setup,
2344	.validate	= ip6erspan_tap_validate,
2345	.newlink	= ip6erspan_newlink,
2346	.changelink	= ip6erspan_changelink,
2347	.get_size	= ip6gre_get_size,
2348	.fill_info	= ip6gre_fill_info,
2349	.get_link_net	= ip6_tnl_get_link_net,
2350};
2351
2352/*
2353 *	And now the modules code and kernel interface.
2354 */
2355
2356static int __init ip6gre_init(void)
2357{
2358	int err;
2359
2360	pr_info("GRE over IPv6 tunneling driver\n");
2361
2362	err = register_pernet_device(&ip6gre_net_ops);
2363	if (err < 0)
2364		return err;
2365
2366	err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2367	if (err < 0) {
2368		pr_info("%s: can't add protocol\n", __func__);
2369		goto add_proto_failed;
2370	}
2371
2372	err = rtnl_link_register(&ip6gre_link_ops);
2373	if (err < 0)
2374		goto rtnl_link_failed;
2375
2376	err = rtnl_link_register(&ip6gre_tap_ops);
2377	if (err < 0)
2378		goto tap_ops_failed;
2379
2380	err = rtnl_link_register(&ip6erspan_tap_ops);
2381	if (err < 0)
2382		goto erspan_link_failed;
2383
2384out:
2385	return err;
2386
2387erspan_link_failed:
2388	rtnl_link_unregister(&ip6gre_tap_ops);
2389tap_ops_failed:
2390	rtnl_link_unregister(&ip6gre_link_ops);
2391rtnl_link_failed:
2392	inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2393add_proto_failed:
2394	unregister_pernet_device(&ip6gre_net_ops);
2395	goto out;
2396}
2397
2398static void __exit ip6gre_fini(void)
2399{
2400	rtnl_link_unregister(&ip6gre_tap_ops);
2401	rtnl_link_unregister(&ip6gre_link_ops);
2402	rtnl_link_unregister(&ip6erspan_tap_ops);
2403	inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2404	unregister_pernet_device(&ip6gre_net_ops);
2405}
2406
2407module_init(ip6gre_init);
2408module_exit(ip6gre_fini);
2409MODULE_LICENSE("GPL");
2410MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>");
2411MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2412MODULE_ALIAS_RTNL_LINK("ip6gre");
2413MODULE_ALIAS_RTNL_LINK("ip6gretap");
2414MODULE_ALIAS_RTNL_LINK("ip6erspan");
2415MODULE_ALIAS_NETDEV("ip6gre0");