1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SOCK_REUSEPORT_H 3 #define _SOCK_REUSEPORT_H 4 5 #include <linux/filter.h> 6 #include <linux/skbuff.h> 7 #include <linux/types.h> 8 #include <linux/spinlock.h> 9 #include <net/sock.h> 10 11 extern spinlock_t reuseport_lock; 12 13 struct sock_reuseport { 14 struct rcu_head rcu; 15 16 u16 max_socks; /* length of socks */ 17 u16 num_socks; /* elements in socks */ 18 u16 num_closed_socks; /* closed elements in socks */ 19 /* The last synq overflow event timestamp of this 20 * reuse->socks[] group. 21 */ 22 unsigned int synq_overflow_ts; 23 /* ID stays the same even after the size of socks[] grows. */ 24 unsigned int reuseport_id; 25 unsigned int bind_inany:1; 26 unsigned int has_conns:1; 27 struct bpf_prog __rcu *prog; /* optional BPF sock selector */ 28 struct sock *socks[]; /* array of sock pointers */ 29 }; 30 31 extern int reuseport_alloc(struct sock *sk, bool bind_inany); 32 extern int reuseport_add_sock(struct sock *sk, struct sock *sk2, 33 bool bind_inany); 34 extern void reuseport_detach_sock(struct sock *sk); 35 void reuseport_stop_listen_sock(struct sock *sk); 36 extern struct sock *reuseport_select_sock(struct sock *sk, 37 u32 hash, 38 struct sk_buff *skb, 39 int hdr_len); 40 struct sock *reuseport_migrate_sock(struct sock *sk, 41 struct sock *migrating_sk, 42 struct sk_buff *skb); 43 extern int reuseport_attach_prog(struct sock *sk, struct bpf_prog *prog); 44 extern int reuseport_detach_prog(struct sock *sk); 45 46 static inline bool reuseport_has_conns(struct sock *sk) 47 { 48 struct sock_reuseport *reuse; 49 bool ret = false; 50 51 rcu_read_lock(); 52 reuse = rcu_dereference(sk->sk_reuseport_cb); 53 if (reuse && reuse->has_conns) 54 ret = true; 55 rcu_read_unlock(); 56 57 return ret; 58 } 59 60 void reuseport_has_conns_set(struct sock *sk); 61 62 #endif /* _SOCK_REUSEPORT_H */ 63