[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / include / net / dst.h

/*
 * net/dst.h	Protocol independent destination cache definitions.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 */

#ifndef _NET_DST_H
#define _NET_DST_H

#include <net/dst_ops.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/rcupdate.h>
#include <linux/jiffies.h>
#include <net/neighbour.h>
#include <asm/processor.h>

#define DST_GC_MIN	(HZ/10)
#define DST_GC_INC	(HZ/2)
#define DST_GC_MAX	(120*HZ)

/* Each dst_entry has reference count and sits in some parent list(s).
 * When it is removed from parent list, it is "freed" (dst_free).
 * After this it enters dead state (dst->obsolete > 0) and if its refcnt
 * is zero, it can be destroyed immediately, otherwise it is added
 * to gc list and garbage collector periodically checks the refcnt.
 */

struct sk_buff;

struct dst_entry {
	struct rcu_head		rcu_head;
	struct dst_entry	*child;
	struct net_device       *dev;
	struct  dst_ops	        *ops;
	unsigned long		_metrics;
	unsigned long		expires;
	struct dst_entry	*path;
	struct neighbour	*neighbour;
	struct hh_cache		*hh;
#ifdef CONFIG_XFRM
	struct xfrm_state	*xfrm;
#else
	void			*__pad1;
#endif
	int			(*input)(struct sk_buff*);
	int			(*output)(struct sk_buff*);

	short			error;
	short			obsolete;
	unsigned short		header_len;	/* more space at head required */
	unsigned short		trailer_len;	/* space to reserve at tail */
#ifdef CONFIG_IP_ROUTE_CLASSID
	__u32			tclassid;
#else
	__u32			__pad2;
#endif

	/*
	 * Align __refcnt to a 64 bytes alignment
	 * (L1_CACHE_SIZE would be too much)
	 */
#ifdef CONFIG_64BIT
	long			__pad_to_align_refcnt[1];
#endif
	/*
	 * __refcnt wants to be on a different cache line from
	 * input/output/ops or performance tanks badly
	 */
	atomic_t		__refcnt;	/* client references	*/
	int			__use;
	unsigned long		lastuse;
	int			flags;
#define DST_HOST		0x0001
#define DST_NOXFRM		0x0002
#define DST_NOPOLICY		0x0004
#define DST_NOHASH		0x0008
#define DST_NOCACHE		0x0010
	union {
		struct dst_entry	*next;
		struct rtable __rcu	*rt_next;
		struct rt6_info		*rt6_next;
		struct dn_route __rcu	*dn_next;
	};
};

extern u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);
extern const u32 dst_default_metrics[RTAX_MAX];

#define DST_METRICS_READ_ONLY	0x1UL
#define __DST_METRICS_PTR(Y)	\
	((u32 *)((Y) & ~DST_METRICS_READ_ONLY))
#define DST_METRICS_PTR(X)	__DST_METRICS_PTR((X)->_metrics)

static inline bool dst_metrics_read_only(const struct dst_entry *dst)
{
	return dst->_metrics & DST_METRICS_READ_ONLY;
}

extern void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old);

static inline void dst_destroy_metrics_generic(struct dst_entry *dst)
{
	unsigned long val = dst->_metrics;
	if (!(val & DST_METRICS_READ_ONLY))
		__dst_destroy_metrics_generic(dst, val);
}

static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst)
{
	unsigned long p = dst->_metrics;

	if (p & DST_METRICS_READ_ONLY)
		return dst->ops->cow_metrics(dst, p);
	return __DST_METRICS_PTR(p);
}

/* This may only be invoked before the entry has reached global
 * visibility.
 */
static inline void dst_init_metrics(struct dst_entry *dst,
				    const u32 *src_metrics,
				    bool read_only)
{
	dst->_metrics = ((unsigned long) src_metrics) |
		(read_only ? DST_METRICS_READ_ONLY : 0);
}

static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src)
{
	u32 *dst_metrics = dst_metrics_write_ptr(dest);

	if (dst_metrics) {
		u32 *src_metrics = DST_METRICS_PTR(src);

		memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32));
	}
}

static inline u32 *dst_metrics_ptr(struct dst_entry *dst)
{
	return DST_METRICS_PTR(dst);
}

static inline u32
dst_metric_raw(const struct dst_entry *dst, const int metric)
{
	u32 *p = DST_METRICS_PTR(dst);

	return p[metric-1];
}

static inline u32
dst_metric(const struct dst_entry *dst, const int metric)
{
	WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
		     metric == RTAX_ADVMSS ||
		     metric == RTAX_MTU);
	return dst_metric_raw(dst, metric);
}

static inline u32
dst_metric_advmss(const struct dst_entry *dst)
{
	u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);

	if (!advmss)
		advmss = dst->ops->default_advmss(dst);

	return advmss;
}

static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
{
	u32 *p = dst_metrics_write_ptr(dst);

	if (p)
		p[metric-1] = val;
}

static inline u32
dst_feature(const struct dst_entry *dst, u32 feature)
{
	return dst_metric(dst, RTAX_FEATURES) & feature;
}

static inline u32 dst_mtu(const struct dst_entry *dst)
{
	u32 mtu = dst_metric_raw(dst, RTAX_MTU);

	if (!mtu)
		mtu = dst->ops->default_mtu(dst);

	return mtu;
}

/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric)
{
	return msecs_to_jiffies(dst_metric(dst, metric));
}

static inline void set_dst_metric_rtt(struct dst_entry *dst, int metric,
				      unsigned long rtt)
{
	dst_metric_set(dst, metric, jiffies_to_msecs(rtt));
}

static inline u32
dst_allfrag(const struct dst_entry *dst)
{
	int ret = dst_feature(dst,  RTAX_FEATURE_ALLFRAG);
	return ret;
}

static inline int
dst_metric_locked(const struct dst_entry *dst, int metric)
{
	return dst_metric(dst, RTAX_LOCK) & (1<<metric);
}

static inline void dst_hold(struct dst_entry * dst)
{
	/*
	 * If your kernel compilation stops here, please check
	 * __pad_to_align_refcnt declaration in struct dst_entry
	 */
	BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
	atomic_inc(&dst->__refcnt);
}

static inline void dst_use(struct dst_entry *dst, unsigned long time)
{
	dst_hold(dst);
	dst->__use++;
	dst->lastuse = time;
}

static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
{
	dst->__use++;
	dst->lastuse = time;
}

static inline
struct dst_entry * dst_clone(struct dst_entry * dst)
{
	if (dst)
		atomic_inc(&dst->__refcnt);
	return dst;
}

extern void dst_release(struct dst_entry *dst);

static inline void refdst_drop(unsigned long refdst)
{
	if (!(refdst & SKB_DST_NOREF))
		dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
}

/**
 * skb_dst_drop - drops skb dst
 * @skb: buffer
 *
 * Drops dst reference count if a reference was taken.
 */
static inline void skb_dst_drop(struct sk_buff *skb)
{
	if (skb->_skb_refdst) {
		refdst_drop(skb->_skb_refdst);
		skb->_skb_refdst = 0UL;
	}
}

static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb)
{
	nskb->_skb_refdst = oskb->_skb_refdst;
	if (!(nskb->_skb_refdst & SKB_DST_NOREF))
		dst_clone(skb_dst(nskb));
}

/**
 * skb_dst_force - makes sure skb dst is refcounted
 * @skb: buffer
 *
 * If dst is not yet refcounted, let's do it
 */
static inline void skb_dst_force(struct sk_buff *skb)
{
	if (skb_dst_is_noref(skb)) {
		WARN_ON(!rcu_read_lock_held());
		skb->_skb_refdst &= ~SKB_DST_NOREF;
		dst_clone(skb_dst(skb));
	}
}


/**
 *	__skb_tunnel_rx - prepare skb for rx reinsert
 *	@skb: buffer
 *	@dev: tunnel device
 *
 *	After decapsulation, packet is going to re-enter (netif_rx()) our stack,
 *	so make some cleanups. (no accounting done)
 */
static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev)
{
	skb->dev = dev;
	skb->rxhash = 0;
	skb_set_queue_mapping(skb, 0);
	skb_dst_drop(skb);
	nf_reset(skb);
}

/**
 *	skb_tunnel_rx - prepare skb for rx reinsert
 *	@skb: buffer
 *	@dev: tunnel device
 *
 *	After decapsulation, packet is going to re-enter (netif_rx()) our stack,
 *	so make some cleanups, and perform accounting.
 *	Note: this accounting is not SMP safe.
 */
static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev)
{
	/* TODO : stats should be SMP safe */
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += skb->len;
	__skb_tunnel_rx(skb, dev);
}

/* Children define the path of the packet through the
 * Linux networking.  Thus, destinations are stackable.
 */

static inline struct dst_entry *skb_dst_pop(struct sk_buff *skb)
{
	struct dst_entry *child = dst_clone(skb_dst(skb)->child);

	skb_dst_drop(skb);
	return child;
}

extern int dst_discard(struct sk_buff *skb);
extern void *dst_alloc(struct dst_ops * ops, struct net_device *dev,
		       int initial_ref, int initial_obsolete, int flags);
extern void __dst_free(struct dst_entry * dst);
extern struct dst_entry *dst_destroy(struct dst_entry * dst);

static inline void dst_free(struct dst_entry * dst)
{
	if (dst->obsolete > 1)
		return;
	if (!atomic_read(&dst->__refcnt)) {
		dst = dst_destroy(dst);
		if (!dst)
			return;
	}
	__dst_free(dst);
}

static inline void dst_rcu_free(struct rcu_head *head)
{
	struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head);
	dst_free(dst);
}

static inline void dst_confirm(struct dst_entry *dst)
{
	if (dst)
		neigh_confirm(dst->neighbour);
}

static inline void dst_link_failure(struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);
	if (dst && dst->ops && dst->ops->link_failure)
		dst->ops->link_failure(skb);
}

static inline void dst_set_expires(struct dst_entry *dst, int timeout)
{
	unsigned long expires = jiffies + timeout;

	if (expires == 0)
		expires = 1;

	if (dst->expires == 0 || time_before(expires, dst->expires))
		dst->expires = expires;
}

/* Output packet to network from transport.  */
static inline int dst_output(struct sk_buff *skb)
{
	return skb_dst(skb)->output(skb);
}

/* Input packet from network to transport.  */
static inline int dst_input(struct sk_buff *skb)
{
	return skb_dst(skb)->input(skb);
}

static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
{
	if (dst->obsolete)
		dst = dst->ops->check(dst, cookie);
	return dst;
}

extern void		dst_init(void);

/* Flags for xfrm_lookup flags argument. */
enum {
	XFRM_LOOKUP_ICMP = 1 << 0,
};

struct flowi;
#ifndef CONFIG_XFRM
static inline struct dst_entry *xfrm_lookup(struct net *net,
					    struct dst_entry *dst_orig,
					    const struct flowi *fl, struct sock *sk,
					    int flags)
{
	return dst_orig;
} 
#else
extern struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
				     const struct flowi *fl, struct sock *sk,
				     int flags);
#endif

#endif /* _NET_DST_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/dst.h Protocol independent destination cache definitions.
	3	*
	4	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	5	*
	6	*/
	7
	8	#ifndef _NET_DST_H
	9	#define _NET_DST_H
	10
86393e52	11	#include <net/dst_ops.h>
14c85021	12	#include <linux/netdevice.h>
1da177e4 LT	13	#include <linux/rtnetlink.h>
	14	#include <linux/rcupdate.h>
	15	#include <linux/jiffies.h>
	16	#include <net/neighbour.h>
	17	#include <asm/processor.h>
	18
1da177e4 LT	19	#define DST_GC_MIN (HZ/10)
	20	#define DST_GC_INC (HZ/2)
	21	#define DST_GC_MAX (120*HZ)
	22
	23	/* Each dst_entry has reference count and sits in some parent list(s).
	24	* When it is removed from parent list, it is "freed" (dst_free).
	25	* After this it enters dead state (dst->obsolete > 0) and if its refcnt
	26	* is zero, it can be destroyed immediately, otherwise it is added
	27	* to gc list and garbage collector periodically checks the refcnt.
	28	*/
	29
	30	struct sk_buff;
	31
fd2c3ef7	32	struct dst_entry {
1e19e02c	33	struct rcu_head rcu_head;
1da177e4 LT	34	struct dst_entry *child;
1da177e4 LT	35	struct net_device *dev;
62fa8a84 DM	36	struct dst_ops *ops;
62fa8a84 DM	37	unsigned long _metrics;
1da177e4	38	unsigned long expires;
f1dd9c37	39	struct dst_entry *path;
1da177e4 LT	40	struct neighbour *neighbour;
1da177e4 LT	41	struct hh_cache *hh;
def8b4fa	42	#ifdef CONFIG_XFRM
1da177e4	43	struct xfrm_state *xfrm;
5635c10d ED	44	#else
5635c10d ED	45	void *__pad1;
def8b4fa	46	#endif
1da177e4 LT	47	int (input)(struct sk_buff);
	48	int (output)(struct sk_buff);
	49
62fa8a84 DM	50	short error;
	51	short obsolete;
	52	unsigned short header_len; /* more space at head required */
	53	unsigned short trailer_len; /* space to reserve at tail */
c7066f70	54	#ifdef CONFIG_IP_ROUTE_CLASSID
f1dd9c37	55	__u32 tclassid;
5635c10d ED	56	#else
5635c10d ED	57	__u32 __pad2;
f1dd9c37 ZY	58	#endif
f1dd9c37 ZY	59
5635c10d ED	60	/*
	61	* Align __refcnt to a 64 bytes alignment
	62	* (L1_CACHE_SIZE would be too much)
	63	*/
	64	#ifdef CONFIG_64BIT
5635c10d ED	65	long __pad_to_align_refcnt[1];
5635c10d ED	66	#endif
f1dd9c37 ZY	67	/*
	68	* __refcnt wants to be on a different cache line from
	69	* input/output/ops or performance tanks badly
	70	*/
1e19e02c ED	71	atomic_t __refcnt; /* client references */
1e19e02c ED	72	int __use;
f1dd9c37	73	unsigned long lastuse;
62fa8a84 DM	74	int flags;
	75	#define DST_HOST 0x0001
	76	#define DST_NOXFRM 0x0002
	77	#define DST_NOPOLICY 0x0004
	78	#define DST_NOHASH 0x0008
	79	#define DST_NOCACHE 0x0010
1e19e02c	80	union {
fc766e4c ED	81	struct dst_entry *next;
	82	struct rtable __rcu *rt_next;
	83	struct rt6_info *rt6_next;
	84	struct dn_route __rcu *dn_next;
1e19e02c	85	};
1da177e4 LT	86	};
1da177e4 LT	87
62fa8a84	88	extern u32 dst_cow_metrics_generic(struct dst_entry dst, unsigned long old);
725d1e1b	89	extern const u32 dst_default_metrics[RTAX_MAX];
62fa8a84 DM	90
	91	#define DST_METRICS_READ_ONLY 0x1UL
	92	#define __DST_METRICS_PTR(Y) \
	93	((u32 *)((Y) & ~DST_METRICS_READ_ONLY))
	94	#define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics)
	95
	96	static inline bool dst_metrics_read_only(const struct dst_entry *dst)
	97	{
	98	return dst->_metrics & DST_METRICS_READ_ONLY;
	99	}
	100
	101	extern void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old);
	102
	103	static inline void dst_destroy_metrics_generic(struct dst_entry *dst)
	104	{
	105	unsigned long val = dst->_metrics;
	106	if (!(val & DST_METRICS_READ_ONLY))
	107	__dst_destroy_metrics_generic(dst, val);
	108	}
	109
	110	static inline u32 dst_metrics_write_ptr(struct dst_entry dst)
	111	{
	112	unsigned long p = dst->_metrics;
	113
	114	if (p & DST_METRICS_READ_ONLY)
	115	return dst->ops->cow_metrics(dst, p);
	116	return __DST_METRICS_PTR(p);
	117	}
	118
	119	/* This may only be invoked before the entry has reached global
	120	* visibility.
	121	*/
	122	static inline void dst_init_metrics(struct dst_entry *dst,
	123	const u32 *src_metrics,
	124	bool read_only)
	125	{
	126	dst->_metrics = ((unsigned long) src_metrics) \|
	127	(read_only ? DST_METRICS_READ_ONLY : 0);
	128	}
	129
	130	static inline void dst_copy_metrics(struct dst_entry dest, const struct dst_entry src)
	131	{
	132	u32 *dst_metrics = dst_metrics_write_ptr(dest);
	133
	134	if (dst_metrics) {
	135	u32 *src_metrics = DST_METRICS_PTR(src);
	136
	137	memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32));
	138	}
	139	}
	140
	141	static inline u32 dst_metrics_ptr(struct dst_entry dst)
	142	{
	143	return DST_METRICS_PTR(dst);
	144	}
	145
1da177e4	146	static inline u32
5170ae82	147	dst_metric_raw(const struct dst_entry *dst, const int metric)
1da177e4	148	{
62fa8a84 DM	149	u32 *p = DST_METRICS_PTR(dst);
	150
	151	return p[metric-1];
defb3519 DM	152	}
defb3519 DM	153
5170ae82 DM	154	static inline u32
	155	dst_metric(const struct dst_entry *dst, const int metric)
	156	{
0dbaee3b	157	WARN_ON_ONCE(metric == RTAX_HOPLIMIT \|\|
d33e4553 DM	158	metric == RTAX_ADVMSS \|\|
d33e4553 DM	159	metric == RTAX_MTU);
5170ae82 DM	160	return dst_metric_raw(dst, metric);
	161	}
	162
0dbaee3b DM	163	static inline u32
	164	dst_metric_advmss(const struct dst_entry *dst)
	165	{
	166	u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);
	167
	168	if (!advmss)
	169	advmss = dst->ops->default_advmss(dst);
	170
	171	return advmss;
	172	}
	173
defb3519 DM	174	static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
defb3519 DM	175	{
62fa8a84	176	u32 *p = dst_metrics_write_ptr(dst);
defb3519	177
62fa8a84 DM	178	if (p)
62fa8a84 DM	179	p[metric-1] = val;
1da177e4 LT	180	}
1da177e4 LT	181
0c3adfb8 GBY	182	static inline u32
	183	dst_feature(const struct dst_entry *dst, u32 feature)
	184	{
bb5b7c11	185	return dst_metric(dst, RTAX_FEATURES) & feature;
0c3adfb8 GBY	186	}
0c3adfb8 GBY	187
1da177e4 LT	188	static inline u32 dst_mtu(const struct dst_entry *dst)
1da177e4 LT	189	{
d33e4553 DM	190	u32 mtu = dst_metric_raw(dst, RTAX_MTU);
	191
	192	if (!mtu)
	193	mtu = dst->ops->default_mtu(dst);
	194
1da177e4 LT	195	return mtu;
	196	}
	197
c1e20f7c SH	198	/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
	199	static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric)
	200	{
	201	return msecs_to_jiffies(dst_metric(dst, metric));
	202	}
	203
	204	static inline void set_dst_metric_rtt(struct dst_entry *dst, int metric,
	205	unsigned long rtt)
	206	{
defb3519	207	dst_metric_set(dst, metric, jiffies_to_msecs(rtt));
c1e20f7c SH	208	}
c1e20f7c SH	209
1da177e4 LT	210	static inline u32
	211	dst_allfrag(const struct dst_entry *dst)
	212	{
0c3adfb8	213	int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG);
1da177e4 LT	214	return ret;
	215	}
	216
	217	static inline int
d33e4553	218	dst_metric_locked(const struct dst_entry *dst, int metric)
1da177e4 LT	219	{
	220	return dst_metric(dst, RTAX_LOCK) & (1<<metric);
	221	}
	222
	223	static inline void dst_hold(struct dst_entry * dst)
	224	{
5635c10d ED	225	/*
	226	* If your kernel compilation stops here, please check
	227	* __pad_to_align_refcnt declaration in struct dst_entry
	228	*/
	229	BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
1da177e4 LT	230	atomic_inc(&dst->__refcnt);
	231	}
	232
03f49f34 PE	233	static inline void dst_use(struct dst_entry *dst, unsigned long time)
	234	{
	235	dst_hold(dst);
	236	dst->__use++;
	237	dst->lastuse = time;
	238	}
	239
7fee226a ED	240	static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
	241	{
	242	dst->__use++;
	243	dst->lastuse = time;
	244	}
	245
1da177e4 LT	246	static inline
	247	struct dst_entry * dst_clone(struct dst_entry * dst)
	248	{
	249	if (dst)
	250	atomic_inc(&dst->__refcnt);
	251	return dst;
	252	}
	253
8d330868	254	extern void dst_release(struct dst_entry *dst);
7fee226a ED	255
	256	static inline void refdst_drop(unsigned long refdst)
	257	{
	258	if (!(refdst & SKB_DST_NOREF))
	259	dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
	260	}
	261
	262	/**
	263	* skb_dst_drop - drops skb dst
	264	* @skb: buffer
	265	*
	266	* Drops dst reference count if a reference was taken.
	267	*/
adf30907 ED	268	static inline void skb_dst_drop(struct sk_buff *skb)
adf30907 ED	269	{
7fee226a ED	270	if (skb->_skb_refdst) {
	271	refdst_drop(skb->_skb_refdst);
	272	skb->_skb_refdst = 0UL;
	273	}
	274	}
	275
	276	static inline void skb_dst_copy(struct sk_buff nskb, const struct sk_buff oskb)
	277	{
	278	nskb->_skb_refdst = oskb->_skb_refdst;
	279	if (!(nskb->_skb_refdst & SKB_DST_NOREF))
	280	dst_clone(skb_dst(nskb));
	281	}
	282
	283	/**
	284	* skb_dst_force - makes sure skb dst is refcounted
	285	* @skb: buffer
	286	*
	287	* If dst is not yet refcounted, let's do it
	288	*/
	289	static inline void skb_dst_force(struct sk_buff *skb)
	290	{
	291	if (skb_dst_is_noref(skb)) {
	292	WARN_ON(!rcu_read_lock_held());
	293	skb->_skb_refdst &= ~SKB_DST_NOREF;
	294	dst_clone(skb_dst(skb));
	295	}
adf30907	296	}
1da177e4	297
d19d56dd	298
290b895e ED	299	/**
	300	* __skb_tunnel_rx - prepare skb for rx reinsert
	301	* @skb: buffer
	302	* @dev: tunnel device
	303	*
	304	* After decapsulation, packet is going to re-enter (netif_rx()) our stack,
	305	* so make some cleanups. (no accounting done)
	306	*/
	307	static inline void __skb_tunnel_rx(struct sk_buff skb, struct net_device dev)
	308	{
	309	skb->dev = dev;
	310	skb->rxhash = 0;
	311	skb_set_queue_mapping(skb, 0);
	312	skb_dst_drop(skb);
	313	nf_reset(skb);
	314	}
	315
d19d56dd ED	316	/**
	317	* skb_tunnel_rx - prepare skb for rx reinsert
	318	* @skb: buffer
	319	* @dev: tunnel device
	320	*
	321	* After decapsulation, packet is going to re-enter (netif_rx()) our stack,
	322	* so make some cleanups, and perform accounting.
290b895e	323	* Note: this accounting is not SMP safe.
d19d56dd ED	324	*/
	325	static inline void skb_tunnel_rx(struct sk_buff skb, struct net_device dev)
	326	{
d19d56dd ED	327	/* TODO : stats should be SMP safe */
	328	dev->stats.rx_packets++;
	329	dev->stats.rx_bytes += skb->len;
290b895e	330	__skb_tunnel_rx(skb, dev);
d19d56dd ED	331	}
d19d56dd ED	332
1da177e4 LT	333	/* Children define the path of the packet through the
	334	* Linux networking. Thus, destinations are stackable.
	335	*/
	336
8764ab2c	337	static inline struct dst_entry skb_dst_pop(struct sk_buff skb)
1da177e4	338	{
e433430a	339	struct dst_entry *child = dst_clone(skb_dst(skb)->child);
1da177e4	340
8764ab2c	341	skb_dst_drop(skb);
1da177e4 LT	342	return child;
	343	}
	344
352e512c	345	extern int dst_discard(struct sk_buff *skb);
5c1e6aa3 DM	346	extern void dst_alloc(struct dst_ops ops, struct net_device *dev,
5c1e6aa3 DM	347	int initial_ref, int initial_obsolete, int flags);
1da177e4 LT	348	extern void __dst_free(struct dst_entry * dst);
	349	extern struct dst_entry dst_destroy(struct dst_entry dst);
	350
	351	static inline void dst_free(struct dst_entry * dst)
	352	{
	353	if (dst->obsolete > 1)
	354	return;
	355	if (!atomic_read(&dst->__refcnt)) {
	356	dst = dst_destroy(dst);
	357	if (!dst)
	358	return;
	359	}
	360	__dst_free(dst);
	361	}
	362
	363	static inline void dst_rcu_free(struct rcu_head *head)
	364	{
	365	struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head);
	366	dst_free(dst);
	367	}
	368
	369	static inline void dst_confirm(struct dst_entry *dst)
	370	{
	371	if (dst)
	372	neigh_confirm(dst->neighbour);
	373	}
	374
1da177e4 LT	375	static inline void dst_link_failure(struct sk_buff *skb)
1da177e4 LT	376	{
adf30907	377	struct dst_entry *dst = skb_dst(skb);
1da177e4 LT	378	if (dst && dst->ops && dst->ops->link_failure)
	379	dst->ops->link_failure(skb);
	380	}
	381
	382	static inline void dst_set_expires(struct dst_entry *dst, int timeout)
	383	{
	384	unsigned long expires = jiffies + timeout;
	385
	386	if (expires == 0)
	387	expires = 1;
	388
	389	if (dst->expires == 0 \|\| time_before(expires, dst->expires))
	390	dst->expires = expires;
	391	}
	392
	393	/* Output packet to network from transport. */
	394	static inline int dst_output(struct sk_buff *skb)
	395	{
adf30907	396	return skb_dst(skb)->output(skb);
1da177e4 LT	397	}
	398
	399	/* Input packet from network to transport. */
	400	static inline int dst_input(struct sk_buff *skb)
	401	{
adf30907	402	return skb_dst(skb)->input(skb);
1da177e4 LT	403	}
	404
	405	static inline struct dst_entry dst_check(struct dst_entry dst, u32 cookie)
	406	{
	407	if (dst->obsolete)
	408	dst = dst->ops->check(dst, cookie);
	409	return dst;
	410	}
	411
	412	extern void dst_init(void);
	413
815f4e57 HX	414	/* Flags for xfrm_lookup flags argument. */
815f4e57 HX	415	enum {
80c0bc9e	416	XFRM_LOOKUP_ICMP = 1 << 0,
815f4e57 HX	417	};
815f4e57 HX	418
1da177e4 LT	419	struct flowi;
1da177e4 LT	420	#ifndef CONFIG_XFRM
452edd59 DM	421	static inline struct dst_entry xfrm_lookup(struct net net,
	422	struct dst_entry *dst_orig,
	423	const struct flowi fl, struct sock sk,
	424	int flags)
1da177e4	425	{
452edd59	426	return dst_orig;
1da177e4 LT	427	}
1da177e4 LT	428	#else
452edd59 DM	429	extern struct dst_entry xfrm_lookup(struct net net, struct dst_entry *dst_orig,
	430	const struct flowi fl, struct sock sk,
	431	int flags);
1da177e4	432	#endif
1da177e4 LT	433
1da177e4 LT	434	#endif /* _NET_DST_H */