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ipv6: add READ_ONCE(sk->sk_bound_dev_if) in INET6_MATCH()

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INET6_MATCH() runs without holding a lock on the socket.

We probably need to annotate most reads.

This patch makes INET6_MATCH() an inline function
to ease our changes.

v2: inline function only defined if IS_ENABLED(CONFIG_IPV6)
    Change the name to inet6_match(), this is no longer a macro.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-05-13 11:55:49 -07:00 committed by David S. Miller
parent ff0094030f
commit 5d368f0328
4 changed files with 24 additions and 14 deletions
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28
include/net/inet6_hashtables.h
View File

@ -103,15 +103,25 @@ struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
const int dif);
int inet6_hash(struct sock *sk);
static inline bool inet6_match(struct net *net, const struct sock *sk,
const struct in6_addr *saddr,
const struct in6_addr *daddr,
const __portpair ports,
const int dif, const int sdif)
{
int bound_dev_if;
if (!net_eq(sock_net(sk), net) ||
sk->sk_family != AF_INET6 ||
sk->sk_portpair != ports ||
!ipv6_addr_equal(&sk->sk_v6_daddr, saddr) ||
!ipv6_addr_equal(&sk->sk_v6_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 /* IS_ENABLED(CONFIG_IPV6) */
#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif, __sdif) \
(((__sk)->sk_portpair == (__ports)) && \
((__sk)->sk_family == AF_INET6) && \
ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr)) && \
ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr)) && \
(((__sk)->sk_bound_dev_if == (__dif)) || \
((__sk)->sk_bound_dev_if == (__sdif))) && \
net_eq(sock_net(__sk), (__net)))
#endif /* _INET6_HASHTABLES_H */

2
net/ipv4/inet_hashtables.c
View File

@ -499,7 +499,7 @@ static bool inet_ehash_lookup_by_sk(struct sock *sk,
}
#if IS_ENABLED(CONFIG_IPV6)
else if (sk->sk_family == AF_INET6) {
if (unlikely(INET6_MATCH(esk, net,
if (unlikely(inet6_match(net, esk,
&sk->sk_v6_daddr,
&sk->sk_v6_rcv_saddr,
ports, dif, sdif))) {

6
net/ipv6/inet6_hashtables.c
View File

@ -71,12 +71,12 @@ begin:
sk_nulls_for_each_rcu(sk, node, &head->chain) {
if (sk->sk_hash != hash)
continue;
if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))
if (!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))
continue;
if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
goto out;
if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))) {
if (unlikely(!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))) {
sock_gen_put(sk);
goto begin;
}
@ -268,7 +268,7 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
if (sk2->sk_hash != hash)
continue;
if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports,
if (likely(inet6_match(net, sk2, saddr, daddr, ports,
dif, sdif))) {
if (sk2->sk_state == TCP_TIME_WAIT) {
tw = inet_twsk(sk2);

2
net/ipv6/udp.c
View File

@ -1044,7 +1044,7 @@ static struct sock *__udp6_lib_demux_lookup(struct net *net,
udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
if (sk->sk_state == TCP_ESTABLISHED &&
INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif))
return sk;
/* Only check first socket in chain */
break;