[GitHub/mt8127/android_kernel_alcatel_ttab.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/bug.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;
	union {
		unsigned long           expires;
		/* point to where the dst_entry copied from */
		struct dst_entry        *from;
	};
	struct dst_entry	*path;
	void			*__pad0;
#ifdef CONFIG_XFRM
	struct xfrm_state	*xfrm;
#else
	void			*__pad1;
#endif
	int			(*input)(struct sk_buff *);
	int			(*output)(struct sk_buff *);

	unsigned short		flags;
#define DST_HOST		0x0001
#define DST_NOXFRM		0x0002
#define DST_NOPOLICY		0x0004
#define DST_NOHASH		0x0008
#define DST_NOCACHE		0x0010
#define DST_NOCOUNT		0x0020
#define DST_NOPEER		0x0040
#define DST_FAKE_RTABLE		0x0080
#define DST_XFRM_TUNNEL		0x0100

	unsigned short		pending_confirm;

	short			error;

	/* A non-zero value of dst->obsolete forces by-hand validation
	 * of the route entry.  Positive values are set by the generic
	 * dst layer to indicate that the entry has been forcefully
	 * destroyed.
	 *
	 * Negative values are used by the implementation layer code to
	 * force invocation of the dst_ops->check() method.
	 */
	short			obsolete;
#define DST_OBSOLETE_NONE	0
#define DST_OBSOLETE_DEAD	2
#define DST_OBSOLETE_FORCE_CHK	-1
	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[2];
#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;
	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;

	BUG_ON(!p);

	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)
{
	return dst->ops->mtu(dst);
}

/* 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 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;

	/*
	 * Clear rxhash so that we can recalulate the hash for the
	 * encapsulated packet, unless we have already determine the hash
	 * over the L4 4-tuple.
	 */
	if (!skb->l4_rxhash)
		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,
		       unsigned short 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 > 0)
		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)
{
	dst->pending_confirm = 1;
}

static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n,
				   struct sk_buff *skb)
{
	struct hh_cache *hh;

	if (unlikely(dst->pending_confirm)) {
		n->confirmed = jiffies;
		dst->pending_confirm = 0;
	}

	hh = &n->hh;
	if ((n->nud_state & NUD_CONNECTED) && hh->hh_len)
		return neigh_hh_output(hh, skb);
	else
		return n->output(n, skb);
}

static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
{
	return dst->ops->neigh_lookup(dst, NULL, daddr);
}

static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst,
						     struct sk_buff *skb)
{
	return dst->ops->neigh_lookup(dst, skb, NULL);
}

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>
1da177e4 LT	14	#include <linux/rcupdate.h>
187f1882	15	#include <linux/bug.h>
1da177e4 LT	16	#include <linux/jiffies.h>
	17	#include <net/neighbour.h>
	18	#include <asm/processor.h>
	19
1da177e4 LT	20	#define DST_GC_MIN (HZ/10)
	21	#define DST_GC_INC (HZ/2)
	22	#define DST_GC_MAX (120*HZ)
	23
	24	/* Each dst_entry has reference count and sits in some parent list(s).
	25	* When it is removed from parent list, it is "freed" (dst_free).
	26	* After this it enters dead state (dst->obsolete > 0) and if its refcnt
	27	* is zero, it can be destroyed immediately, otherwise it is added
	28	* to gc list and garbage collector periodically checks the refcnt.
	29	*/
	30
	31	struct sk_buff;
	32
fd2c3ef7	33	struct dst_entry {
1e19e02c	34	struct rcu_head rcu_head;
1da177e4 LT	35	struct dst_entry *child;
1da177e4 LT	36	struct net_device *dev;
62fa8a84 DM	37	struct dst_ops *ops;
62fa8a84 DM	38	unsigned long _metrics;
1716a961 G	39	union {
	40	unsigned long expires;
	41	/* point to where the dst_entry copied from */
	42	struct dst_entry *from;
	43	};
f1dd9c37	44	struct dst_entry *path;
36bdbcae	45	void *__pad0;
def8b4fa	46	#ifdef CONFIG_XFRM
1da177e4	47	struct xfrm_state *xfrm;
5635c10d ED	48	#else
5635c10d ED	49	void *__pad1;
def8b4fa	50	#endif
7f95e188 EZ	51	int (input)(struct sk_buff );
7f95e188 EZ	52	int (output)(struct sk_buff );
1da177e4	53
5110effe	54	unsigned short flags;
f6b72b62 DM	55	#define DST_HOST 0x0001
	56	#define DST_NOXFRM 0x0002
	57	#define DST_NOPOLICY 0x0004
	58	#define DST_NOHASH 0x0008
	59	#define DST_NOCACHE 0x0010
	60	#define DST_NOCOUNT 0x0020
e688a604	61	#define DST_NOPEER 0x0040
a881e963	62	#define DST_FAKE_RTABLE 0x0080
0c183379	63	#define DST_XFRM_TUNNEL 0x0100
f6b72b62	64
5110effe DM	65	unsigned short pending_confirm;
5110effe DM	66
62fa8a84	67	short error;
f5b0a874 DM	68
	69	/* A non-zero value of dst->obsolete forces by-hand validation
	70	* of the route entry. Positive values are set by the generic
	71	* dst layer to indicate that the entry has been forcefully
	72	* destroyed.
	73	*
	74	* Negative values are used by the implementation layer code to
	75	* force invocation of the dst_ops->check() method.
	76	*/
62fa8a84	77	short obsolete;
f5b0a874 DM	78	#define DST_OBSOLETE_NONE 0
	79	#define DST_OBSOLETE_DEAD 2
	80	#define DST_OBSOLETE_FORCE_CHK -1
62fa8a84 DM	81	unsigned short header_len; /* more space at head required */
62fa8a84 DM	82	unsigned short trailer_len; /* space to reserve at tail */
c7066f70	83	#ifdef CONFIG_IP_ROUTE_CLASSID
f1dd9c37	84	__u32 tclassid;
5635c10d ED	85	#else
5635c10d ED	86	__u32 __pad2;
f1dd9c37 ZY	87	#endif
f1dd9c37 ZY	88
5635c10d ED	89	/*
	90	* Align __refcnt to a 64 bytes alignment
	91	* (L1_CACHE_SIZE would be too much)
	92	*/
	93	#ifdef CONFIG_64BIT
f6b72b62	94	long __pad_to_align_refcnt[2];
5635c10d	95	#endif
f1dd9c37 ZY	96	/*
	97	* __refcnt wants to be on a different cache line from
	98	* input/output/ops or performance tanks badly
	99	*/
1e19e02c ED	100	atomic_t __refcnt; /* client references */
1e19e02c ED	101	int __use;
f1dd9c37	102	unsigned long lastuse;
1e19e02c	103	union {
fc766e4c ED	104	struct dst_entry *next;
	105	struct rtable __rcu *rt_next;
	106	struct rt6_info *rt6_next;
	107	struct dn_route __rcu *dn_next;
1e19e02c	108	};
1da177e4 LT	109	};
1da177e4 LT	110
62fa8a84	111	extern u32 dst_cow_metrics_generic(struct dst_entry dst, unsigned long old);
725d1e1b	112	extern const u32 dst_default_metrics[RTAX_MAX];
62fa8a84 DM	113
	114	#define DST_METRICS_READ_ONLY 0x1UL
	115	#define __DST_METRICS_PTR(Y) \
	116	((u32 *)((Y) & ~DST_METRICS_READ_ONLY))
	117	#define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics)
	118
	119	static inline bool dst_metrics_read_only(const struct dst_entry *dst)
	120	{
	121	return dst->_metrics & DST_METRICS_READ_ONLY;
	122	}
	123
	124	extern void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old);
	125
	126	static inline void dst_destroy_metrics_generic(struct dst_entry *dst)
	127	{
	128	unsigned long val = dst->_metrics;
	129	if (!(val & DST_METRICS_READ_ONLY))
	130	__dst_destroy_metrics_generic(dst, val);
	131	}
	132
	133	static inline u32 dst_metrics_write_ptr(struct dst_entry dst)
	134	{
	135	unsigned long p = dst->_metrics;
	136
1f37070d SH	137	BUG_ON(!p);
1f37070d SH	138
62fa8a84 DM	139	if (p & DST_METRICS_READ_ONLY)
	140	return dst->ops->cow_metrics(dst, p);
	141	return __DST_METRICS_PTR(p);
	142	}
	143
	144	/* This may only be invoked before the entry has reached global
	145	* visibility.
	146	*/
	147	static inline void dst_init_metrics(struct dst_entry *dst,
	148	const u32 *src_metrics,
	149	bool read_only)
	150	{
	151	dst->_metrics = ((unsigned long) src_metrics) \|
	152	(read_only ? DST_METRICS_READ_ONLY : 0);
	153	}
	154
	155	static inline void dst_copy_metrics(struct dst_entry dest, const struct dst_entry src)
	156	{
	157	u32 *dst_metrics = dst_metrics_write_ptr(dest);
	158
	159	if (dst_metrics) {
	160	u32 *src_metrics = DST_METRICS_PTR(src);
	161
	162	memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32));
	163	}
	164	}
	165
	166	static inline u32 dst_metrics_ptr(struct dst_entry dst)
	167	{
	168	return DST_METRICS_PTR(dst);
	169	}
	170
1da177e4	171	static inline u32
5170ae82	172	dst_metric_raw(const struct dst_entry *dst, const int metric)
1da177e4	173	{
62fa8a84 DM	174	u32 *p = DST_METRICS_PTR(dst);
	175
	176	return p[metric-1];
defb3519 DM	177	}
defb3519 DM	178
5170ae82 DM	179	static inline u32
	180	dst_metric(const struct dst_entry *dst, const int metric)
	181	{
0dbaee3b	182	WARN_ON_ONCE(metric == RTAX_HOPLIMIT \|\|
d33e4553 DM	183	metric == RTAX_ADVMSS \|\|
d33e4553 DM	184	metric == RTAX_MTU);
5170ae82 DM	185	return dst_metric_raw(dst, metric);
	186	}
	187
0dbaee3b DM	188	static inline u32
	189	dst_metric_advmss(const struct dst_entry *dst)
	190	{
	191	u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);
	192
	193	if (!advmss)
	194	advmss = dst->ops->default_advmss(dst);
	195
	196	return advmss;
	197	}
	198
defb3519 DM	199	static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
defb3519 DM	200	{
62fa8a84	201	u32 *p = dst_metrics_write_ptr(dst);
defb3519	202
62fa8a84 DM	203	if (p)
62fa8a84 DM	204	p[metric-1] = val;
1da177e4 LT	205	}
1da177e4 LT	206
0c3adfb8 GBY	207	static inline u32
	208	dst_feature(const struct dst_entry *dst, u32 feature)
	209	{
bb5b7c11	210	return dst_metric(dst, RTAX_FEATURES) & feature;
0c3adfb8 GBY	211	}
0c3adfb8 GBY	212
1da177e4 LT	213	static inline u32 dst_mtu(const struct dst_entry *dst)
1da177e4 LT	214	{
618f9bc7	215	return dst->ops->mtu(dst);
1da177e4 LT	216	}
1da177e4 LT	217
c1e20f7c SH	218	/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
	219	static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric)
	220	{
	221	return msecs_to_jiffies(dst_metric(dst, metric));
	222	}
	223
1da177e4 LT	224	static inline u32
	225	dst_allfrag(const struct dst_entry *dst)
	226	{
0c3adfb8	227	int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG);
1da177e4 LT	228	return ret;
	229	}
	230
	231	static inline int
d33e4553	232	dst_metric_locked(const struct dst_entry *dst, int metric)
1da177e4 LT	233	{
	234	return dst_metric(dst, RTAX_LOCK) & (1<<metric);
	235	}
	236
7f95e188	237	static inline void dst_hold(struct dst_entry *dst)
1da177e4	238	{
5635c10d ED	239	/*
	240	* If your kernel compilation stops here, please check
	241	* __pad_to_align_refcnt declaration in struct dst_entry
	242	*/
	243	BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
1da177e4 LT	244	atomic_inc(&dst->__refcnt);
	245	}
	246
03f49f34 PE	247	static inline void dst_use(struct dst_entry *dst, unsigned long time)
	248	{
	249	dst_hold(dst);
	250	dst->__use++;
	251	dst->lastuse = time;
	252	}
	253
7fee226a ED	254	static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
	255	{
	256	dst->__use++;
	257	dst->lastuse = time;
	258	}
	259
7f95e188	260	static inline struct dst_entry dst_clone(struct dst_entry dst)
1da177e4 LT	261	{
	262	if (dst)
	263	atomic_inc(&dst->__refcnt);
	264	return dst;
	265	}
	266
8d330868	267	extern void dst_release(struct dst_entry *dst);
7fee226a ED	268
	269	static inline void refdst_drop(unsigned long refdst)
	270	{
	271	if (!(refdst & SKB_DST_NOREF))
	272	dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
	273	}
	274
	275	/**
	276	* skb_dst_drop - drops skb dst
	277	* @skb: buffer
	278	*
	279	* Drops dst reference count if a reference was taken.
	280	*/
adf30907 ED	281	static inline void skb_dst_drop(struct sk_buff *skb)
adf30907 ED	282	{
7fee226a ED	283	if (skb->_skb_refdst) {
	284	refdst_drop(skb->_skb_refdst);
	285	skb->_skb_refdst = 0UL;
	286	}
	287	}
	288
	289	static inline void skb_dst_copy(struct sk_buff nskb, const struct sk_buff oskb)
	290	{
	291	nskb->_skb_refdst = oskb->_skb_refdst;
	292	if (!(nskb->_skb_refdst & SKB_DST_NOREF))
	293	dst_clone(skb_dst(nskb));
	294	}
	295
	296	/**
	297	* skb_dst_force - makes sure skb dst is refcounted
	298	* @skb: buffer
	299	*
	300	* If dst is not yet refcounted, let's do it
	301	*/
	302	static inline void skb_dst_force(struct sk_buff *skb)
	303	{
	304	if (skb_dst_is_noref(skb)) {
	305	WARN_ON(!rcu_read_lock_held());
	306	skb->_skb_refdst &= ~SKB_DST_NOREF;
	307	dst_clone(skb_dst(skb));
	308	}
adf30907	309	}
1da177e4	310
d19d56dd	311
290b895e ED	312	/**
	313	* __skb_tunnel_rx - prepare skb for rx reinsert
	314	* @skb: buffer
	315	* @dev: tunnel device
	316	*
	317	* After decapsulation, packet is going to re-enter (netif_rx()) our stack,
	318	* so make some cleanups. (no accounting done)
	319	*/
	320	static inline void __skb_tunnel_rx(struct sk_buff skb, struct net_device dev)
	321	{
	322	skb->dev = dev;
bdeab991 TH	323
	324	/*
	325	* Clear rxhash so that we can recalulate the hash for the
	326	* encapsulated packet, unless we have already determine the hash
	327	* over the L4 4-tuple.
	328	*/
	329	if (!skb->l4_rxhash)
	330	skb->rxhash = 0;
290b895e ED	331	skb_set_queue_mapping(skb, 0);
	332	skb_dst_drop(skb);
	333	nf_reset(skb);
	334	}
	335
d19d56dd ED	336	/**
	337	* skb_tunnel_rx - prepare skb for rx reinsert
	338	* @skb: buffer
	339	* @dev: tunnel device
	340	*
	341	* After decapsulation, packet is going to re-enter (netif_rx()) our stack,
	342	* so make some cleanups, and perform accounting.
290b895e	343	* Note: this accounting is not SMP safe.
d19d56dd ED	344	*/
	345	static inline void skb_tunnel_rx(struct sk_buff skb, struct net_device dev)
	346	{
d19d56dd ED	347	/* TODO : stats should be SMP safe */
	348	dev->stats.rx_packets++;
	349	dev->stats.rx_bytes += skb->len;
290b895e	350	__skb_tunnel_rx(skb, dev);
d19d56dd ED	351	}
d19d56dd ED	352
1da177e4 LT	353	/* Children define the path of the packet through the
	354	* Linux networking. Thus, destinations are stackable.
	355	*/
	356
8764ab2c	357	static inline struct dst_entry skb_dst_pop(struct sk_buff skb)
1da177e4	358	{
e433430a	359	struct dst_entry *child = dst_clone(skb_dst(skb)->child);
1da177e4	360
8764ab2c	361	skb_dst_drop(skb);
1da177e4 LT	362	return child;
	363	}
	364
352e512c	365	extern int dst_discard(struct sk_buff *skb);
7f95e188	366	extern void dst_alloc(struct dst_ops ops, struct net_device *dev,
5110effe DM	367	int initial_ref, int initial_obsolete,
5110effe DM	368	unsigned short flags);
7f95e188 EZ	369	extern void __dst_free(struct dst_entry *dst);
7f95e188 EZ	370	extern struct dst_entry dst_destroy(struct dst_entry dst);
1da177e4	371
7f95e188	372	static inline void dst_free(struct dst_entry *dst)
1da177e4	373	{
f5b0a874	374	if (dst->obsolete > 0)
1da177e4 LT	375	return;
	376	if (!atomic_read(&dst->__refcnt)) {
	377	dst = dst_destroy(dst);
	378	if (!dst)
	379	return;
	380	}
	381	__dst_free(dst);
	382	}
	383
	384	static inline void dst_rcu_free(struct rcu_head *head)
	385	{
	386	struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head);
	387	dst_free(dst);
	388	}
	389
	390	static inline void dst_confirm(struct dst_entry *dst)
	391	{
5110effe DM	392	dst->pending_confirm = 1;
5110effe DM	393	}
f2c31e32	394
5110effe DM	395	static inline int dst_neigh_output(struct dst_entry dst, struct neighbour n,
	396	struct sk_buff *skb)
	397	{
	398	struct hh_cache *hh;
	399
	400	if (unlikely(dst->pending_confirm)) {
	401	n->confirmed = jiffies;
	402	dst->pending_confirm = 0;
69cce1d1	403	}
5110effe DM	404
	405	hh = &n->hh;
	406	if ((n->nud_state & NUD_CONNECTED) && hh->hh_len)
	407	return neigh_hh_output(hh, skb);
	408	else
	409	return n->output(n, skb);
1da177e4 LT	410	}
1da177e4 LT	411
d3aaeb38 DM	412	static inline struct neighbour dst_neigh_lookup(const struct dst_entry dst, const void *daddr)
d3aaeb38 DM	413	{
f894cbf8 DM	414	return dst->ops->neigh_lookup(dst, NULL, daddr);
	415	}
	416
	417	static inline struct neighbour dst_neigh_lookup_skb(const struct dst_entry dst,
	418	struct sk_buff *skb)
	419	{
	420	return dst->ops->neigh_lookup(dst, skb, NULL);
d3aaeb38 DM	421	}
d3aaeb38 DM	422
1da177e4 LT	423	static inline void dst_link_failure(struct sk_buff *skb)
1da177e4 LT	424	{
adf30907	425	struct dst_entry *dst = skb_dst(skb);
1da177e4 LT	426	if (dst && dst->ops && dst->ops->link_failure)
	427	dst->ops->link_failure(skb);
	428	}
	429
	430	static inline void dst_set_expires(struct dst_entry *dst, int timeout)
	431	{
	432	unsigned long expires = jiffies + timeout;
	433
	434	if (expires == 0)
	435	expires = 1;
	436
	437	if (dst->expires == 0 \|\| time_before(expires, dst->expires))
	438	dst->expires = expires;
	439	}
	440
	441	/* Output packet to network from transport. */
	442	static inline int dst_output(struct sk_buff *skb)
	443	{
adf30907	444	return skb_dst(skb)->output(skb);
1da177e4 LT	445	}
	446
	447	/* Input packet from network to transport. */
	448	static inline int dst_input(struct sk_buff *skb)
	449	{
adf30907	450	return skb_dst(skb)->input(skb);
1da177e4 LT	451	}
	452
	453	static inline struct dst_entry dst_check(struct dst_entry dst, u32 cookie)
	454	{
	455	if (dst->obsolete)
	456	dst = dst->ops->check(dst, cookie);
	457	return dst;
	458	}
	459
	460	extern void dst_init(void);
	461
815f4e57 HX	462	/* Flags for xfrm_lookup flags argument. */
815f4e57 HX	463	enum {
80c0bc9e	464	XFRM_LOOKUP_ICMP = 1 << 0,
815f4e57 HX	465	};
815f4e57 HX	466
1da177e4 LT	467	struct flowi;
1da177e4 LT	468	#ifndef CONFIG_XFRM
452edd59 DM	469	static inline struct dst_entry xfrm_lookup(struct net net,
	470	struct dst_entry *dst_orig,
	471	const struct flowi fl, struct sock sk,
	472	int flags)
1da177e4	473	{
452edd59	474	return dst_orig;
1da177e4 LT	475	}
1da177e4 LT	476	#else
452edd59 DM	477	extern struct dst_entry xfrm_lookup(struct net net, struct dst_entry *dst_orig,
	478	const struct flowi fl, struct sock sk,
	479	int flags);
1da177e4	480	#endif
1da177e4 LT	481
1da177e4 LT	482	#endif /* _NET_DST_H */