Release 4.16 include/net/dst.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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 <linux/refcount.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 net_device       *dev;
	
struct  dst_ops	        *ops;
	
unsigned long		_metrics;
	
unsigned long           expires;
#ifdef CONFIG_XFRM
	
struct xfrm_state	*xfrm;
#else
	
void			*__pad1;
#endif
	
int			(*input)(struct sk_buff *);
	
int			(*output)(struct net *net, struct sock *sk, struct sk_buff *skb);

	
unsigned short		flags;

#define DST_HOST		0x0001

#define DST_NOXFRM		0x0002

#define DST_NOPOLICY		0x0004

#define DST_NOCOUNT		0x0008

#define DST_FAKE_RTABLE		0x0010

#define DST_XFRM_TUNNEL		0x0020

#define DST_XFRM_QUEUE		0x0040

#define DST_METADATA		0x0080

	/* 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

#define DST_OBSOLETE_KILL	-2
	
unsigned short		header_len;	/* more space at head required */
	
unsigned short		trailer_len;	/* space to reserve at tail */

	/*
         * __refcnt wants to be on a different cache line from
         * input/output/ops or performance tanks badly
         */
#ifdef CONFIG_64BIT
	
atomic_t		__refcnt;	/* 64-bit offset 64 */
#endif
	
int			__use;
	
unsigned long		lastuse;
	
struct lwtunnel_state   *lwtstate;
	
struct rcu_head		rcu_head;
	
short			error;
	
short			__pad;
	
__u32			tclassid;
#ifndef CONFIG_64BIT
	
atomic_t		__refcnt;	/* 32-bit offset 64 */
#endif
};


struct dst_metrics {
	
u32		metrics[RTAX_MAX];
	
refcount_t	refcnt;
};
extern const struct dst_metrics dst_default_metrics;

u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);


#define DST_METRICS_READ_ONLY		0x1UL

#define DST_METRICS_REFCOUNTED		0x2UL

#define DST_METRICS_FLAGS		0x3UL

#define __DST_METRICS_PTR(Y)	\
	((u32 *)((Y) & ~DST_METRICS_FLAGS))

#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;
}

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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);
}

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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);
}

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/* 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);
}

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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));
	}
}

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

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static inline u32

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

	return p[metric-1];
}

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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);
}

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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;
}

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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;
}

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/* Kernel-internal feature bits that are unallocated in user space. */

#define DST_FEATURE_ECN_CA	(1 << 31)


#define DST_FEATURE_MASK	(DST_FEATURE_ECN_CA)

#define DST_FEATURE_ECN_MASK	(DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN)


static inline u32

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

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static inline u32 dst_mtu(const struct dst_entry *dst)
{
	return dst->ops->mtu(dst);
}

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/* 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));
}

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static inline u32

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

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static inline int

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

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static inline void dst_hold(struct dst_entry *dst)
{
	/*
         * If your kernel compilation stops here, please check
         * the placement of __refcnt in struct dst_entry
         */
	BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
	WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0);
}

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

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static inline void dst_hold_and_use(struct dst_entry *dst, unsigned long time)
{
	dst_hold(dst);
	dst_use_noref(dst, time);
}

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static inline struct dst_entry *dst_clone(struct dst_entry *dst)
{
	if (dst)
		dst_hold(dst);
	return dst;
}

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void dst_release(struct dst_entry *dst);

void dst_release_immediate(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));
}

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/**
 * 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;
	}
}

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static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst)
{
	nskb->_skb_refdst = refdst;
	if (!(nskb->_skb_refdst & SKB_DST_NOREF))
		dst_clone(skb_dst(nskb));
}

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static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb)
{
	__skb_dst_copy(nskb, oskb->_skb_refdst);
}

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/**
 * dst_hold_safe - Take a reference on a dst if possible
 * @dst: pointer to dst entry
 *
 * This helper returns false if it could not safely
 * take a reference on a dst.
 */


static inline bool dst_hold_safe(struct dst_entry *dst)
{
	return atomic_inc_not_zero(&dst->__refcnt);
}

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/**
 * skb_dst_force - makes sure skb dst is refcounted
 * @skb: buffer
 *
 * If dst is not yet refcounted and not destroyed, grab a ref on it.
 */


static inline void skb_dst_force(struct sk_buff *skb)
{
	if (skb_dst_is_noref(skb)) {
		struct dst_entry *dst = skb_dst(skb);

		WARN_ON(!rcu_read_lock_held());
		if (!dst_hold_safe(dst))
			dst = NULL;

		skb->_skb_refdst = (unsigned long)dst;
	}
}


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/**
 *      __skb_tunnel_rx - prepare skb for rx reinsert
 *      @skb: buffer
 *      @dev: tunnel device
 *      @net: netns for packet i/o
 *
 *      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,
				   struct net *net)
{
	skb->dev = dev;

	/*
         * Clear hash so that we can recalulate the hash for the
         * encapsulated packet, unless we have already determine the hash
         * over the L4 4-tuple.
         */
	skb_clear_hash_if_not_l4(skb);
	skb_set_queue_mapping(skb, 0);
	skb_scrub_packet(skb, !net_eq(net, dev_net(dev)));
}

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/**
 *      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,
				 struct net *net)
{
	/* TODO : stats should be SMP safe */
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += skb->len;
	__skb_tunnel_rx(skb, dev, net);
}

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static inline u32 dst_tclassid(const struct sk_buff *skb)
{
#ifdef CONFIG_IP_ROUTE_CLASSID
	const struct dst_entry *dst;

	dst = skb_dst(skb);
	if (dst)
		return dst->tclassid;
#endif
	return 0;
}

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int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);


static inline int dst_discard(struct sk_buff *skb)
{
	return dst_discard_out(&init_net, skb->sk, skb);
}
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void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref,
		int initial_obsolete, unsigned short flags);
void dst_init(struct dst_entry *dst, struct dst_ops *ops,
	      struct net_device *dev, int initial_ref, int initial_obsolete,
	      unsigned short flags);
struct dst_entry *dst_destroy(struct dst_entry *dst);
void dst_dev_put(struct dst_entry *dst);



static inline void dst_confirm(struct dst_entry *dst)
{
}

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

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

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static inline void dst_confirm_neigh(const struct dst_entry *dst,
				     const void *daddr)
{
	if (dst->ops->confirm_neigh)
		dst->ops->confirm_neigh(dst, daddr);
}

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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);
}

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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;
}

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/* Output packet to network from transport.  */


static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	return skb_dst(skb)->output(net, sk, skb);
}

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Patrick McHardy
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/* Input packet from network to transport.  */


static inline int dst_input(struct sk_buff *skb)
{
	return skb_dst(skb)->input(skb);
}

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

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/* Flags for xfrm_lookup flags argument. */

enum {
	
XFRM_LOOKUP_ICMP = 1 << 0,
	
XFRM_LOOKUP_QUEUE = 1 << 1,
	
XFRM_LOOKUP_KEEP_DST_REF = 1 << 2,
};

struct flowi;
#ifndef CONFIG_XFRM


static inline struct dst_entry *xfrm_lookup(struct net *net,
					    struct dst_entry *dst_orig,
					    const struct flowi *fl,
					    const struct sock *sk,
					    int flags)
{
	return dst_orig;
}

Contributors
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CommitProp
Andi Kleen
25
67.57%
1
20.00%
David S. Miller
6
16.22%
2
40.00%
Alexey Dobriyan
5
13.51%
1
20.00%
Eric Dumazet
1
2.70%
1
20.00%
Total
37
100.00%
5
100.00%



static inline struct dst_entry *xfrm_lookup_route(struct net *net,
						  struct dst_entry *dst_orig,
						  const struct flowi *fl,
						  const struct sock *sk,
						  int flags)
{
	return dst_orig;
}

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Steffen Klassert
36
97.30%
1
50.00%
Eric Dumazet
1
2.70%
1
50.00%
Total
37
100.00%
2
100.00%



static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
{
	return NULL;
}

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Vlad Yasevich
18
100.00%
1
100.00%
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18
100.00%
1
100.00%

#else
struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
			      const struct flowi *fl, const struct sock *sk,
			      int flags);

struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
				    const struct flowi *fl, const struct sock *sk,
				    int flags);

/* skb attached with this dst needs transformation if dst->xfrm is valid */


static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
{
	return dst->xfrm;
}
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20
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20
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1
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#endif



static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu)
{
	struct dst_entry *dst = skb_dst(skb);

	if (dst && dst->ops->update_pmtu)
		dst->ops->update_pmtu(dst, NULL, skb, mtu);
}

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Nicolas Dichtel
50
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1
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50
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1
100.00%

#endif /* _NET_DST_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
582
28.01%
20
20.00%
Eric Dumazet
393
18.91%
12
12.00%
Linus Torvalds (pre-git)
238
11.45%
10
10.00%
Alexey Kuznetsov
125
6.02%
3
3.00%
Steffen Klassert
77
3.71%
5
5.00%
Nicolas Dichtel
74
3.56%
2
2.00%
Herbert Xu
70
3.37%
5
5.00%
Daniel Borkmann
56
2.69%
2
2.00%
Wei Wang
47
2.26%
5
5.00%
Vlad Yasevich
39
1.88%
1
1.00%
Julian Anastasov
38
1.83%
2
2.00%
Stephen Hemminger
36
1.73%
3
3.00%
Joe Stringer
32
1.54%
1
1.00%
Thomas Graf
31
1.49%
1
1.00%
Zhouyi Zhou
30
1.44%
1
1.00%
Andi Kleen
30
1.44%
1
1.00%
Gilad Ben-Yossef
28
1.35%
1
1.00%
Pavel Emelyanov
27
1.30%
1
1.00%
Hideaki Yoshifuji / 吉藤英明
24
1.15%
1
1.00%
Eric W. Biedermann
23
1.11%
3
3.00%
Alexey Dobriyan
23
1.11%
4
4.00%
Tom Herbert
11
0.53%
2
2.00%
Huaibin Wang
6
0.29%
1
1.00%
Jiri Benc
5
0.24%
1
1.00%
Michal Kubeček
5
0.24%
1
1.00%
Yanmin Zhang
4
0.19%
1
1.00%
Gao Feng
3
0.14%
1
1.00%
Linus Torvalds
3
0.14%
1
1.00%
Dipankar Sarma
3
0.14%
1
1.00%
Arnaldo Carvalho de Melo
3
0.14%
1
1.00%
Peter Huang (Peng)
3
0.14%
1
1.00%
Paul Gortmaker
3
0.14%
1
1.00%
Paolo Abeni
3
0.14%
1
1.00%
Patrick McHardy
1
0.05%
1
1.00%
Greg Kroah-Hartman
1
0.05%
1
1.00%
Ilpo Järvinen
1
0.05%
1
1.00%
Eldad Zack
0.00%
0
0.00%
Total
2078
100.00%
100
100.00%
Directory: include/net

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