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Miller" , Jakub Kicinski , Paolo Abeni Cc: netdev , Eric Dumazet , Eric Dumazet Subject: [PATCH net-next 10/10] inet: add READ_ONCE(sk->sk_bound_dev_if) in INET_MATCH() Date: Wed, 11 May 2022 16:37:57 -0700 Message-Id: <20220511233757.2001218-11-eric.dumazet@gmail.com> X-Mailer: git-send-email 2.36.0.512.ge40c2bad7a-goog In-Reply-To: <20220511233757.2001218-1-eric.dumazet@gmail.com> References: <20220511233757.2001218-1-eric.dumazet@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Eric Dumazet INET_MATCH() runs without holding a lock on the socket. We probably need to annotate most reads. This patch makes INET_MATCH() an inline function to ease our changes. This also allows us to add some __always_unused qualifiers. Signed-off-by: Eric Dumazet --- include/net/inet_hashtables.h | 52 +++++++++++++++++++++++++---------- 1 file changed, 38 insertions(+), 14 deletions(-) diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h index 98e1ec1a14f0382d1f4f8e85fe5ac2a056d2d6bc..5d3fa071d754601149c9ad0dd559f074ac58deaa 100644 --- a/include/net/inet_hashtables.h +++ b/include/net/inet_hashtables.h @@ -307,23 +307,47 @@ static inline struct sock *inet_lookup_listener(struct net *net, (((__force __u64)(__be32)(__daddr)) << 32) | \ ((__force __u64)(__be32)(__saddr))) #endif /* __BIG_ENDIAN */ -#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \ - (((__sk)->sk_portpair == (__ports)) && \ - ((__sk)->sk_addrpair == (__cookie)) && \ - (((__sk)->sk_bound_dev_if == (__dif)) || \ - ((__sk)->sk_bound_dev_if == (__sdif))) && \ - net_eq(sock_net(__sk), (__net))) +static inline bool INET_MATCH(const struct sock *sk, struct net *net, + const __addrpair cookie, + const __be32 __always_unused saddr, + const __be32 __always_unused daddr, + const __portpair ports, + const int dif, + const int sdif) +{ + int bound_dev_if; + + if (!net_eq(sock_net(sk), net) || + sk->sk_portpair != ports || + sk->sk_addrpair != cookie) + return false; + + bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); + return bound_dev_if == dif || bound_dev_if == sdif; +} #else /* 32-bit arch */ #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \ - const int __name __deprecated __attribute__((unused)) + const int __name __deprecated __always_unused -#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \ - (((__sk)->sk_portpair == (__ports)) && \ - ((__sk)->sk_daddr == (__saddr)) && \ - ((__sk)->sk_rcv_saddr == (__daddr)) && \ - (((__sk)->sk_bound_dev_if == (__dif)) || \ - ((__sk)->sk_bound_dev_if == (__sdif))) && \ - net_eq(sock_net(__sk), (__net))) +static inline bool INET_MATCH(const struct sock *sk, struct net *net, + const __addrpair __always_unused cookie, + const __be32 saddr, + const __be32 daddr, + const __portpair ports, + const int dif, + const int sdif) +{ + int bound_dev_if; + + if (!net_eq(sock_net(sk), net) || + sk->sk_portpair != ports || + sk->sk_daddr != saddr || + sk->sk_rcv_saddr != daddr) + return false; + + bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); + return bound_dev_if == dif || bound_dev_if == sdif; +} #endif /* 64-bit arch */ /* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need -- 2.36.0.512.ge40c2bad7a-goog