mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/* Copyright (c) 2020 Cloudflare Ltd https://cloudflare.com */
|
||
|
|
|
||
|
|
#include <linux/skmsg.h>
|
||
|
|
#include <net/sock.h>
|
||
|
|
#include <net/udp.h>
|
||
|
|
|
||
|
|
enum {
|
||
|
|
UDP_BPF_IPV4,
|
||
|
|
UDP_BPF_IPV6,
|
||
|
|
UDP_BPF_NUM_PROTS,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct proto *udpv6_prot_saved __read_mostly;
|
||
|
|
static DEFINE_SPINLOCK(udpv6_prot_lock);
|
||
|
|
static struct proto udp_bpf_prots[UDP_BPF_NUM_PROTS];
|
||
|
|
|
||
|
|
static void udp_bpf_rebuild_protos(struct proto *prot, const struct proto *base)
|
||
|
|
{
|
||
|
|
*prot = *base;
|
||
|
|
prot->unhash = sock_map_unhash;
|
||
|
|
prot->close = sock_map_close;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void udp_bpf_check_v6_needs_rebuild(struct sock *sk, struct proto *ops)
|
||
|
|
{
|
||
|
|
if (sk->sk_family == AF_INET6 &&
|
||
|
|
unlikely(ops != smp_load_acquire(&udpv6_prot_saved))) {
|
||
|
|
spin_lock_bh(&udpv6_prot_lock);
|
||
|
|
if (likely(ops != udpv6_prot_saved)) {
|
||
|
|
udp_bpf_rebuild_protos(&udp_bpf_prots[UDP_BPF_IPV6], ops);
|
||
|
|
smp_store_release(&udpv6_prot_saved, ops);
|
||
|
|
}
|
||
|
|
spin_unlock_bh(&udpv6_prot_lock);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init udp_bpf_v4_build_proto(void)
|
||
|
|
{
|
||
|
|
udp_bpf_rebuild_protos(&udp_bpf_prots[UDP_BPF_IPV4], &udp_prot);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
core_initcall(udp_bpf_v4_build_proto);
|
||
|
|
|
||
|
|
struct proto *udp_bpf_get_proto(struct sock *sk, struct sk_psock *psock)
|
||
|
|
{
|
||
|
|
int family = sk->sk_family == AF_INET ? UDP_BPF_IPV4 : UDP_BPF_IPV6;
|
||
|
|
|
||
|
|
if (!psock->sk_proto)
|
||
|
|
udp_bpf_check_v6_needs_rebuild(sk, READ_ONCE(sk->sk_prot));
|
||
|
|
|
||
|
|
return &udp_bpf_prots[family];
|
||
|
|
}
|