Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /* Copyright (c) 2020 Cloudflare Ltd https://cloudflare.com */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/skmsg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <net/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	UDP_BPF_IPV4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	UDP_BPF_IPV6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	UDP_BPF_NUM_PROTS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static struct proto *udpv6_prot_saved __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static DEFINE_SPINLOCK(udpv6_prot_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static struct proto udp_bpf_prots[UDP_BPF_NUM_PROTS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static void udp_bpf_rebuild_protos(struct proto *prot, const struct proto *base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	*prot        = *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	prot->unhash = sock_map_unhash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	prot->close  = sock_map_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static void udp_bpf_check_v6_needs_rebuild(struct proto *ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	if (unlikely(ops != smp_load_acquire(&udpv6_prot_saved))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		spin_lock_bh(&udpv6_prot_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		if (likely(ops != udpv6_prot_saved)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 			udp_bpf_rebuild_protos(&udp_bpf_prots[UDP_BPF_IPV6], ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 			smp_store_release(&udpv6_prot_saved, ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		spin_unlock_bh(&udpv6_prot_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int __init udp_bpf_v4_build_proto(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	udp_bpf_rebuild_protos(&udp_bpf_prots[UDP_BPF_IPV4], &udp_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) late_initcall(udp_bpf_v4_build_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct proto *udp_bpf_get_proto(struct sock *sk, struct sk_psock *psock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	int family = sk->sk_family == AF_INET ? UDP_BPF_IPV4 : UDP_BPF_IPV6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	if (sk->sk_family == AF_INET6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		udp_bpf_check_v6_needs_rebuild(psock->sk_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	return &udp_bpf_prots[family];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }