ip_tunnels.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __NET_IP_TUNNELS_H
  3#define __NET_IP_TUNNELS_H 1
  4
  5#include <linux/if_tunnel.h>
  6#include <linux/netdevice.h>
  7#include <linux/skbuff.h>
  8#include <linux/socket.h>
  9#include <linux/types.h>
 10#include <linux/u64_stats_sync.h>
 11#include <linux/bitops.h>
 12
 13#include <net/dsfield.h>
 14#include <net/flow.h>
 15#include <net/gro_cells.h>
 16#include <net/inet_dscp.h>
 17#include <net/inet_ecn.h>
 18#include <net/netns/generic.h>
 19#include <net/rtnetlink.h>
 20#include <net/lwtunnel.h>
 21#include <net/dst_cache.h>
 22#include <net/netdev_lock.h>
 23
 24#if IS_ENABLED(CONFIG_IPV6)
 25#include <net/ipv6.h>
 26#include <net/ip6_fib.h>
 27#include <net/ip6_route.h>
 28#endif
 29
 30/* Recursion limit for tunnel xmit to detect routing loops.
 31 * Unlike XMIT_RECURSION_LIMIT (8) used in the no-qdisc path, tunnel
 32 * recursion involves route lookups and full IP output, consuming much
 33 * more stack per level, so a lower limit is needed.
 34 */
 35#define IP_TUNNEL_RECURSION_LIMIT	5
 36
 37/* Keep error state on tunnel for 30 sec */
 38#define IPTUNNEL_ERR_TIMEO	(30*HZ)
 39
 40/* Used to memset ip_tunnel padding. */
 41#define IP_TUNNEL_KEY_SIZE	offsetofend(struct ip_tunnel_key, tp_dst)
 42
 43/* Used to memset ipv4 address padding. */
 44#define IP_TUNNEL_KEY_IPV4_PAD	offsetofend(struct ip_tunnel_key, u.ipv4.dst)
 45#define IP_TUNNEL_KEY_IPV4_PAD_LEN				\
 46	(sizeof_field(struct ip_tunnel_key, u) -		\
 47	 sizeof_field(struct ip_tunnel_key, u.ipv4))
 48
 49#define __ipt_flag_op(op, ...)					\
 50	op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM)
 51
 52#define IP_TUNNEL_DECLARE_FLAGS(...)				\
 53	__ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__)
 54
 55#define ip_tunnel_flags_zero(...)	__ipt_flag_op(bitmap_zero, __VA_ARGS__)
 56#define ip_tunnel_flags_copy(...)	__ipt_flag_op(bitmap_copy, __VA_ARGS__)
 57#define ip_tunnel_flags_and(...)	__ipt_flag_op(bitmap_and, __VA_ARGS__)
 58#define ip_tunnel_flags_or(...)		__ipt_flag_op(bitmap_or, __VA_ARGS__)
 59
 60#define ip_tunnel_flags_empty(...)				\
 61	__ipt_flag_op(bitmap_empty, __VA_ARGS__)
 62#define ip_tunnel_flags_intersect(...)				\
 63	__ipt_flag_op(bitmap_intersects, __VA_ARGS__)
 64#define ip_tunnel_flags_subset(...)				\
 65	__ipt_flag_op(bitmap_subset, __VA_ARGS__)
 66
 67struct ip_tunnel_key {
 68	__be64			tun_id;
 69	union {
 70		struct {
 71			__be32	src;
 72			__be32	dst;
 73		} ipv4;
 74		struct {
 75			struct in6_addr src;
 76			struct in6_addr dst;
 77		} ipv6;
 78	} u;
 79	IP_TUNNEL_DECLARE_FLAGS(tun_flags);
 80	__be32			label;		/* Flow Label for IPv6 */
 81	u32			nhid;
 82	u8			tos;		/* TOS for IPv4, TC for IPv6 */
 83	u8			ttl;		/* TTL for IPv4, HL for IPv6 */
 84	__be16			tp_src;
 85	__be16			tp_dst;
 86	__u8			flow_flags;
 87};
 88
 89struct ip_tunnel_encap {
 90	u16			type;
 91	u16			flags;
 92	__be16			sport;
 93	__be16			dport;
 94};
 95
 96/* Flags for ip_tunnel_info mode. */
 97#define IP_TUNNEL_INFO_TX	0x01	/* represents tx tunnel parameters */
 98#define IP_TUNNEL_INFO_IPV6	0x02	/* key contains IPv6 addresses */
 99#define IP_TUNNEL_INFO_BRIDGE	0x04	/* represents a bridged tunnel id */
100
101/* Maximum tunnel options length. */
102#define IP_TUNNEL_OPTS_MAX					\
103	GENMASK((sizeof_field(struct ip_tunnel_info,		\
104			      options_len) * BITS_PER_BYTE) - 1, 0)
105
106#define ip_tunnel_info_opts(info)				\
107	_Generic(info,						\
108		 const struct ip_tunnel_info * : ((const void *)(info)->options),\
109		 struct ip_tunnel_info * : ((void *)(info)->options)\
110	)
111
112struct ip_tunnel_info {
113	struct ip_tunnel_key	key;
114	struct ip_tunnel_encap	encap;
115#ifdef CONFIG_DST_CACHE
116	struct dst_cache	dst_cache;
117#endif
118	u8			options_len;
119	u8			mode;
120	u8			options[] __aligned_largest __counted_by(options_len);
121};
122
123/* 6rd prefix/relay information */
124#ifdef CONFIG_IPV6_SIT_6RD
125struct ip_tunnel_6rd_parm {
126	struct in6_addr		prefix;
127	__be32			relay_prefix;
128	u16			prefixlen;
129	u16			relay_prefixlen;
130};
131#endif
132
133struct ip_tunnel_prl_entry {
134	struct ip_tunnel_prl_entry __rcu *next;
135	__be32				addr;
136	u16				flags;
137	struct rcu_head			rcu_head;
138};
139
140struct metadata_dst;
141
142/* Kernel-side variant of ip_tunnel_parm */
143struct ip_tunnel_parm_kern {
144	char			name[IFNAMSIZ];
145	IP_TUNNEL_DECLARE_FLAGS(i_flags);
146	IP_TUNNEL_DECLARE_FLAGS(o_flags);
147	__be32			i_key;
148	__be32			o_key;
149	int			link;
150	struct iphdr		iph;
151};
152
153struct ip_tunnel {
154	struct ip_tunnel __rcu	*next;
155	struct hlist_node hash_node;
156
157	struct net_device	*dev;
158	netdevice_tracker	dev_tracker;
159
160	struct net		*net;	/* netns for packet i/o */
161
162	unsigned long	err_time;	/* Time when the last ICMP error
163					 * arrived */
164	int		err_count;	/* Number of arrived ICMP errors */
165
166	/* These four fields used only by GRE */
167	u32		i_seqno;	/* The last seen seqno	*/
168	atomic_t	o_seqno;	/* The last output seqno */
169	int		tun_hlen;	/* Precalculated header length */
170
171	/* These four fields used only by ERSPAN */
172	u32		index;		/* ERSPAN type II index */
173	u8		erspan_ver;	/* ERSPAN version */
174	u8		dir;		/* ERSPAN direction */
175	u16		hwid;		/* ERSPAN hardware ID */
176
177	struct dst_cache dst_cache;
178
179	struct ip_tunnel_parm_kern parms;
180
181	int		mlink;
182	int		encap_hlen;	/* Encap header length (FOU,GUE) */
183	int		hlen;		/* tun_hlen + encap_hlen */
184	struct ip_tunnel_encap encap;
185
186	/* for SIT */
187#ifdef CONFIG_IPV6_SIT_6RD
188	struct ip_tunnel_6rd_parm ip6rd;
189#endif
190	struct ip_tunnel_prl_entry __rcu *prl;	/* potential router list */
191	unsigned int		prl_count;	/* # of entries in PRL */
192	unsigned int		ip_tnl_net_id;
193	struct gro_cells	gro_cells;
194	__u32			fwmark;
195	bool			collect_md;
196	bool			ignore_df;
197};
198
199struct tnl_ptk_info {
200	IP_TUNNEL_DECLARE_FLAGS(flags);
201	__be16 proto;
202	__be32 key;
203	__be32 seq;
204	int hdr_len;
205};
206
207#define PACKET_RCVD	0
208#define PACKET_REJECT	1
209#define PACKET_NEXT	2
210
211#define IP_TNL_HASH_BITS   7
212#define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)
213
214struct ip_tunnel_net {
215	struct net_device *fb_tunnel_dev;
216	struct rtnl_link_ops *rtnl_link_ops;
217	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
218	struct ip_tunnel __rcu *collect_md_tun;
219	int type;
220};
221
222static inline void ip_tunnel_set_options_present(unsigned long *flags)
223{
224	IP_TUNNEL_DECLARE_FLAGS(present) = { };
225
226	__set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
227	__set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
228	__set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
229	__set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
230	__set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
231
232	ip_tunnel_flags_or(flags, flags, present);
233}
234
235static inline void ip_tunnel_clear_options_present(unsigned long *flags)
236{
237	IP_TUNNEL_DECLARE_FLAGS(present) = { };
238
239	__set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
240	__set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
241	__set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
242	__set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
243	__set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
244
245	__ipt_flag_op(bitmap_andnot, flags, flags, present);
246}
247
248static inline bool ip_tunnel_is_options_present(const unsigned long *flags)
249{
250	IP_TUNNEL_DECLARE_FLAGS(present) = { };
251
252	__set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present);
253	__set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present);
254	__set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present);
255	__set_bit(IP_TUNNEL_GTP_OPT_BIT, present);
256	__set_bit(IP_TUNNEL_PFCP_OPT_BIT, present);
257
258	return ip_tunnel_flags_intersect(flags, present);
259}
260
261static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags)
262{
263	IP_TUNNEL_DECLARE_FLAGS(supp) = { };
264
265	bitmap_set(supp, 0, BITS_PER_TYPE(__be16));
266	__set_bit(IP_TUNNEL_VTI_BIT, supp);
267
268	return ip_tunnel_flags_subset(flags, supp);
269}
270
271static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags)
272{
273	ip_tunnel_flags_zero(dst);
274
275	bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16));
276	__assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI);
277}
278
279static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags)
280{
281	__be16 ret;
282
283	ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16)));
284	if (test_bit(IP_TUNNEL_VTI_BIT, flags))
285		ret |= VTI_ISVTI;
286
287	return ret;
288}
289
290static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
291				      __be32 saddr, __be32 daddr,
292				      u8 tos, u8 ttl, __be32 label,
293				      __be16 tp_src, __be16 tp_dst,
294				      __be64 tun_id,
295				      const unsigned long *tun_flags)
296{
297	key->tun_id = tun_id;
298	key->u.ipv4.src = saddr;
299	key->u.ipv4.dst = daddr;
300	memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
301	       0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
302	key->tos = tos;
303	key->ttl = ttl;
304	key->label = label;
305	ip_tunnel_flags_copy(key->tun_flags, tun_flags);
306
307	/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
308	 * the upper tunnel are used.
309	 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
310	 */
311	key->tp_src = tp_src;
312	key->tp_dst = tp_dst;
313
314	/* Clear struct padding. */
315	if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
316		memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
317		       0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
318}
319
320static inline bool
321ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
322			   const struct ip_tunnel_info *info)
323{
324	if (skb->mark)
325		return false;
326
327	return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags);
328}
329
330static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
331					       *tun_info)
332{
333	return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
334}
335
336static inline __be64 key32_to_tunnel_id(__be32 key)
337{
338#ifdef __BIG_ENDIAN
339	return (__force __be64)key;
340#else
341	return (__force __be64)((__force u64)key << 32);
342#endif
343}
344
345/* Returns the least-significant 32 bits of a __be64. */
346static inline __be32 tunnel_id_to_key32(__be64 tun_id)
347{
348#ifdef __BIG_ENDIAN
349	return (__force __be32)tun_id;
350#else
351	return (__force __be32)((__force u64)tun_id >> 32);
352#endif
353}
354
355#ifdef CONFIG_INET
356
357static inline void ip_tunnel_init_flow(struct flowi4 *fl4,
358				       int proto,
359				       __be32 daddr, __be32 saddr,
360				       __be32 key, __u8 tos,
361				       struct net *net, int oif,
362				       __u32 mark, __u32 tun_inner_hash,
363				       __u8 flow_flags)
364{
365	memset(fl4, 0, sizeof(*fl4));
366
367	if (oif) {
368		fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif);
369		/* Legacy VRF/l3mdev use case */
370		fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif;
371	}
372
373	fl4->daddr = daddr;
374	fl4->saddr = saddr;
375	fl4->flowi4_dscp = inet_dsfield_to_dscp(tos);
376	fl4->flowi4_proto = proto;
377	fl4->fl4_gre_key = key;
378	fl4->flowi4_mark = mark;
379	fl4->flowi4_multipath_hash = tun_inner_hash;
380	fl4->flowi4_flags = flow_flags;
381}
382
383int __ip_tunnel_init(struct net_device *dev);
384#define ip_tunnel_init(DEV)			\
385({						\
386	struct net_device *__dev = (DEV);	\
387	int __res = __ip_tunnel_init(__dev);	\
388						\
389	if (!__res)				\
390		netdev_lockdep_set_classes(__dev);\
391	__res;					\
392})
393
394void ip_tunnel_uninit(struct net_device *dev);
395void  ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
396struct net *ip_tunnel_get_link_net(const struct net_device *dev);
397int ip_tunnel_get_iflink(const struct net_device *dev);
398int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
399		       struct rtnl_link_ops *ops, char *devname);
400void ip_tunnel_delete_net(struct net *net, unsigned int id,
401			  struct rtnl_link_ops *ops,
402			  struct list_head *dev_to_kill);
403
404void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
405		    const struct iphdr *tnl_params, const u8 protocol);
406void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
407		       const u8 proto, int tunnel_hlen);
408int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p,
409		  int cmd);
410bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp,
411			      const void __user *data);
412bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp);
413int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
414			     void __user *data, int cmd);
415int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
416int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
417
418struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
419				   int link, const unsigned long *flags,
420				   __be32 remote, __be32 local,
421				   __be32 key);
422
423void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info);
424int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
425		  const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
426		  bool log_ecn_error);
427int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
428			 struct ip_tunnel_parm_kern *p, __u32 fwmark);
429int ip_tunnel_newlink(struct net *net, struct net_device *dev,
430		      struct nlattr *tb[], struct ip_tunnel_parm_kern *p,
431		      __u32 fwmark);
432void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
433
434bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
435				   struct ip_tunnel_encap *encap);
436
437void ip_tunnel_netlink_parms(struct nlattr *data[],
438			     struct ip_tunnel_parm_kern *parms);
439
440extern const struct header_ops ip_tunnel_header_ops;
441__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
442
443struct ip_tunnel_encap_ops {
444	size_t (*encap_hlen)(struct ip_tunnel_encap *e);
445	int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
446			    u8 *protocol, struct flowi4 *fl4);
447	int (*err_handler)(struct sk_buff *skb, u32 info);
448};
449
450#define MAX_IPTUN_ENCAP_OPS 8
451
452extern const struct ip_tunnel_encap_ops __rcu *
453		iptun_encaps[MAX_IPTUN_ENCAP_OPS];
454
455int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
456			    unsigned int num);
457int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
458			    unsigned int num);
459
460int ip_tunnel_encap_setup(struct ip_tunnel *t,
461			  struct ip_tunnel_encap *ipencap);
462
463static inline enum skb_drop_reason
464pskb_inet_may_pull_reason(struct sk_buff *skb)
465{
466	int nhlen;
467
468	switch (skb->protocol) {
469#if IS_ENABLED(CONFIG_IPV6)
470	case htons(ETH_P_IPV6):
471		nhlen = sizeof(struct ipv6hdr);
472		break;
473#endif
474	case htons(ETH_P_IP):
475		nhlen = sizeof(struct iphdr);
476		break;
477	default:
478		nhlen = 0;
479	}
480
481	return pskb_network_may_pull_reason(skb, nhlen);
482}
483
484static inline bool pskb_inet_may_pull(struct sk_buff *skb)
485{
486	return pskb_inet_may_pull_reason(skb) == SKB_NOT_DROPPED_YET;
487}
488
489/* Variant of pskb_inet_may_pull().
490 */
491static inline enum skb_drop_reason
492skb_vlan_inet_prepare(struct sk_buff *skb, bool inner_proto_inherit)
493{
494	int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN;
495	__be16 type = skb->protocol;
496	enum skb_drop_reason reason;
497
498	/* Essentially this is skb_protocol(skb, true)
499	 * And we get MAC len.
500	 */
501	if (eth_type_vlan(type))
502		type = __vlan_get_protocol(skb, type, &maclen);
503
504	switch (type) {
505#if IS_ENABLED(CONFIG_IPV6)
506	case htons(ETH_P_IPV6):
507		nhlen = sizeof(struct ipv6hdr);
508		break;
509#endif
510	case htons(ETH_P_IP):
511		nhlen = sizeof(struct iphdr);
512		break;
513	}
514	/* For ETH_P_IPV6/ETH_P_IP we make sure to pull
515	 * a base network header in skb->head.
516	 */
517	reason = pskb_may_pull_reason(skb, maclen + nhlen);
518	if (reason)
519		return reason;
520
521	skb_set_network_header(skb, maclen);
522
523	return SKB_NOT_DROPPED_YET;
524}
525
526static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
527{
528	const struct ip_tunnel_encap_ops *ops;
529	int hlen = -EINVAL;
530
531	if (e->type == TUNNEL_ENCAP_NONE)
532		return 0;
533
534	if (e->type >= MAX_IPTUN_ENCAP_OPS)
535		return -EINVAL;
536
537	rcu_read_lock();
538	ops = rcu_dereference(iptun_encaps[e->type]);
539	if (likely(ops && ops->encap_hlen))
540		hlen = ops->encap_hlen(e);
541	rcu_read_unlock();
542
543	return hlen;
544}
545
546static inline int ip_tunnel_encap(struct sk_buff *skb,
547				  struct ip_tunnel_encap *e,
548				  u8 *protocol, struct flowi4 *fl4)
549{
550	const struct ip_tunnel_encap_ops *ops;
551	int ret = -EINVAL;
552
553	if (e->type == TUNNEL_ENCAP_NONE)
554		return 0;
555
556	if (e->type >= MAX_IPTUN_ENCAP_OPS)
557		return -EINVAL;
558
559	rcu_read_lock();
560	ops = rcu_dereference(iptun_encaps[e->type]);
561	if (likely(ops && ops->build_header))
562		ret = ops->build_header(skb, e, protocol, fl4);
563	rcu_read_unlock();
564
565	return ret;
566}
567
568/* Extract dsfield from inner protocol */
569static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
570				       const struct sk_buff *skb)
571{
572	__be16 payload_protocol = skb_protocol(skb, true);
573
574	if (payload_protocol == htons(ETH_P_IP))
575		return iph->tos;
576	else if (payload_protocol == htons(ETH_P_IPV6))
577		return ipv6_get_dsfield((const struct ipv6hdr *)iph);
578	else
579		return 0;
580}
581
582static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph,
583					     const struct sk_buff *skb)
584{
585	__be16 payload_protocol = skb_protocol(skb, true);
586
587	if (payload_protocol == htons(ETH_P_IPV6))
588		return ip6_flowlabel((const struct ipv6hdr *)iph);
589	else
590		return 0;
591}
592
593static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph,
594				       const struct sk_buff *skb)
595{
596	__be16 payload_protocol = skb_protocol(skb, true);
597
598	if (payload_protocol == htons(ETH_P_IP))
599		return iph->ttl;
600	else if (payload_protocol == htons(ETH_P_IPV6))
601		return ((const struct ipv6hdr *)iph)->hop_limit;
602	else
603		return 0;
604}
605
606/* Propagate ECN bits out */
607static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
608				     const struct sk_buff *skb)
609{
610	u8 inner = ip_tunnel_get_dsfield(iph, skb);
611
612	return INET_ECN_encapsulate(tos, inner);
613}
614
615int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
616			   __be16 inner_proto, bool raw_proto, bool xnet);
617
618static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
619				       __be16 inner_proto, bool xnet)
620{
621	return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
622}
623
624void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
625		   __be32 src, __be32 dst, u8 proto,
626		   u8 tos, u8 ttl, __be16 df, bool xnet, u16 ipcb_flags);
627struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
628					     gfp_t flags);
629int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
630			  int headroom, bool reply);
631
632static inline void ip_tunnel_adj_headroom(struct net_device *dev,
633					  unsigned int headroom)
634{
635	/* we must cap headroom to some upperlimit, else pskb_expand_head
636	 * will overflow header offsets in skb_headers_offset_update().
637	 */
638	const unsigned int max_allowed = 512;
639
640	if (headroom > max_allowed)
641		headroom = max_allowed;
642
643	if (headroom > READ_ONCE(dev->needed_headroom))
644		WRITE_ONCE(dev->needed_headroom, headroom);
645}
646
647int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
648
649static inline int iptunnel_pull_offloads(struct sk_buff *skb)
650{
651	if (skb_is_gso(skb)) {
652		int err;
653
654		err = skb_unclone(skb, GFP_ATOMIC);
655		if (unlikely(err))
656			return err;
657		skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
658					       NETIF_F_GSO_SHIFT);
659	}
660
661	skb->encapsulation = 0;
662	return 0;
663}
664
665static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
666{
667	if (pkt_len > 0) {
668		if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_DSTATS) {
669			struct pcpu_dstats *dstats = get_cpu_ptr(dev->dstats);
670
671			u64_stats_update_begin(&dstats->syncp);
672			u64_stats_add(&dstats->tx_bytes, pkt_len);
673			u64_stats_inc(&dstats->tx_packets);
674			u64_stats_update_end(&dstats->syncp);
675			put_cpu_ptr(dstats);
676			return;
677		}
678		if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_TSTATS) {
679			struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
680
681			u64_stats_update_begin(&tstats->syncp);
682			u64_stats_add(&tstats->tx_bytes, pkt_len);
683			u64_stats_inc(&tstats->tx_packets);
684			u64_stats_update_end(&tstats->syncp);
685			put_cpu_ptr(tstats);
686			return;
687		}
688		pr_err_once("iptunnel_xmit_stats pcpu_stat_type=%d\n",
689			    dev->pcpu_stat_type);
690		WARN_ON_ONCE(1);
691		return;
692	}
693
694	if (pkt_len < 0) {
695		DEV_STATS_INC(dev, tx_errors);
696		DEV_STATS_INC(dev, tx_aborted_errors);
697	} else {
698		DEV_STATS_INC(dev, tx_dropped);
699	}
700}
701
702static inline void ip_tunnel_info_opts_get(void *to,
703					   const struct ip_tunnel_info *info)
704{
705	memcpy(to, ip_tunnel_info_opts(info), info->options_len);
706}
707
708static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
709					   const void *from, int len,
710					   const unsigned long *flags)
711{
712	info->options_len = len;
713	if (len > 0) {
714		memcpy(ip_tunnel_info_opts(info), from, len);
715		ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags,
716				   flags);
717	}
718}
719
720static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
721{
722	return (struct ip_tunnel_info *)lwtstate->data;
723}
724
725DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
726
727/* Returns > 0 if metadata should be collected */
728static inline int ip_tunnel_collect_metadata(void)
729{
730	return static_branch_unlikely(&ip_tunnel_metadata_cnt);
731}
732
733void __init ip_tunnel_core_init(void);
734
735void ip_tunnel_need_metadata(void);
736void ip_tunnel_unneed_metadata(void);
737
738#else /* CONFIG_INET */
739
740static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
741{
742	return NULL;
743}
744
745static inline void ip_tunnel_need_metadata(void)
746{
747}
748
749static inline void ip_tunnel_unneed_metadata(void)
750{
751}
752
753static inline void ip_tunnel_info_opts_get(void *to,
754					   const struct ip_tunnel_info *info)
755{
756}
757
758static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
759					   const void *from, int len,
760					   const unsigned long *flags)
761{
762	info->options_len = 0;
763}
764
765#endif /* CONFIG_INET */
766
767#endif /* __NET_IP_TUNNELS_H */