bpf: Add sockmap hooks for UDP sockets (edc6741c) · Commits · 戴 / test

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		@@ -9370,6 +9370,7 @@ F: include/linux/skmsg.h
		F: net/core/skmsg.c
		F: net/core/sock_map.c
		F: net/ipv4/tcp_bpf.c
		F: net/ipv4/udp_bpf.c

		LANTIQ / INTEL Ethernet drivers
		M: Hauke Mehrtens <hauke@hauke-m.de>

+5 −0

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		@@ -503,4 +503,9 @@ static inline struct sk_buff udp_rcv_segment(struct sock sk,
		return segs;
		}

		#ifdef CONFIG_BPF_STREAM_PARSER
		struct sk_psock;
		struct proto udp_bpf_get_proto(struct sock sk, struct sk_psock *psock);
		#endif /* BPF_STREAM_PARSER */

		#endif /* _UDP_H */

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		@@ -61,6 +61,7 @@ obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
		obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
		obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
		obj-$(CONFIG_NET_SOCK_MSG) += tcp_bpf.o
		obj-$(CONFIG_BPF_STREAM_PARSER) += udp_bpf.o
		obj-$(CONFIG_NETLABEL) += cipso_ipv4.o

		obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \

0 → 100644

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		// 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];
		}