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 8 struct dst_entry; 9 struct kmem_cachep; 10 struct net_device; 11 struct sk_buff; 12 struct sock; 13 struct net; 14 15 struct 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 45 static inline int dst_entries_get_fast(struct dst_ops *dst) 46 { 47 return percpu_counter_read_positive(&dst->pcpuc_entries); 48 } 49 50 static inline int dst_entries_get_slow(struct dst_ops *dst) 51 { 52 return percpu_counter_sum_positive(&dst->pcpuc_entries); 53 } 54 55 static inline void dst_entries_add(struct dst_ops *dst, int val) 56 { 57 percpu_counter_add(&dst->pcpuc_entries, val); 58 } 59 60 static inline int dst_entries_init(struct dst_ops *dst) 61 { 62 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL); 63 } 64 65 static inline void dst_entries_destroy(struct dst_ops *dst) 66 { 67 percpu_counter_destroy(&dst->pcpuc_entries); 68 } 69 70 #endif 71