1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_DST_OPS_H
3#define _NET_DST_OPS_H
4#include <linux/types.h>
5#include <linux/percpu_counter.h>
6#include <linux/cache.h>
7
8struct dst_entry;
9struct kmem_cachep;
10struct net_device;
11struct sk_buff;
12struct sock;
13struct net;
14
15struct dst_ops {
16 unsigned short family;
17 unsigned int gc_thresh;
18
19 int (*gc)(struct dst_ops *ops);
20 struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
21 unsigned int (*default_advmss)(const struct dst_entry *);
22 unsigned int (*mtu)(const struct dst_entry *);
23 u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
24 void (*destroy)(struct dst_entry *);
25 void (*ifdown)(struct dst_entry *,
26 struct net_device *dev, int how);
27 struct dst_entry * (*negative_advice)(struct dst_entry *);
28 void (*link_failure)(struct sk_buff *);
29 void (*update_pmtu)(struct dst_entry *dst, struct sock *sk,
30 struct sk_buff *skb, u32 mtu);
31 void (*redirect)(struct dst_entry *dst, struct sock *sk,
32 struct sk_buff *skb);
33 int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
34 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
35 struct sk_buff *skb,
36 const void *daddr);
37 void (*confirm_neigh)(const struct dst_entry *dst,
38 const void *daddr);
39
40 struct kmem_cache *kmem_cachep;
41
42 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
43};
44
45static inline int dst_entries_get_fast(struct dst_ops *dst)
46{
47 return percpu_counter_read_positive(&dst->pcpuc_entries);
48}
49
50static inline int dst_entries_get_slow(struct dst_ops *dst)
51{
52 return percpu_counter_sum_positive(&dst->pcpuc_entries);
53}
54
55static inline void dst_entries_add(struct dst_ops *dst, int val)
56{
57 percpu_counter_add(&dst->pcpuc_entries, val);
58}
59
60static inline int dst_entries_init(struct dst_ops *dst)
61{
62 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
63}
64
65static inline void dst_entries_destroy(struct dst_ops *dst)
66{
67 percpu_counter_destroy(&dst->pcpuc_entries);
68}
69
70#endif
71