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 /* The last synq overflow event timestamp of this 19 * reuse->socks[] group. 20 */ 21 unsigned int synq_overflow_ts; 22 /* ID stays the same even after the size of socks[] grows. */ 23 unsigned int reuseport_id; 24 unsigned int bind_inany:1; 25 unsigned int has_conns:1; 26 struct bpf_prog __rcu *prog; /* optional BPF sock selector */ 27 struct sock *socks[]; /* array of sock pointers */ 28 }; 29 30 extern int reuseport_alloc(struct sock *sk, bool bind_inany); 31 extern int reuseport_add_sock(struct sock *sk, struct sock *sk2, 32 bool bind_inany); 33 extern void reuseport_detach_sock(struct sock *sk); 34 extern struct sock *reuseport_select_sock(struct sock *sk, 35 u32 hash, 36 struct sk_buff *skb, 37 int hdr_len); 38 extern int reuseport_attach_prog(struct sock *sk, struct bpf_prog *prog); 39 extern int reuseport_detach_prog(struct sock *sk); 40 41 static inline bool reuseport_has_conns(struct sock *sk, bool set) 42 { 43 struct sock_reuseport *reuse; 44 bool ret = false; 45 46 rcu_read_lock(); 47 reuse = rcu_dereference(sk->sk_reuseport_cb); 48 if (reuse) { 49 if (set) 50 reuse->has_conns = 1; 51 ret = reuse->has_conns; 52 } 53 rcu_read_unlock(); 54 55 return ret; 56 } 57 58 #endif /* _SOCK_REUSEPORT_H */ 59