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inet: implement lockless IP_TOS

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Some reads of inet->tos are racy.

Add needed READ_ONCE() annotations and convert IP_TOS option lockless.

v2: missing changes in include/net/route.h (David Ahern)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2023-09-22 03:42:16 +00:00
committed by David S. Miller
parent ceaa714138
commit e08d0b3d17
10 changed files with 31 additions and 36 deletions
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9
net/ipv4/tcp_ipv4.c
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@@ -1024,10 +1024,11 @@ static int tcp_v4_send_synack(const struct sock *sk, struct dst_entry *dst,
if (skb) {
__tcp_v4_send_check(skb, ireq->ir_loc_addr, ireq->ir_rmt_addr);
tos = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos) ?
(tcp_rsk(req)->syn_tos & ~INET_ECN_MASK) |
(inet_sk(sk)->tos & INET_ECN_MASK) :
inet_sk(sk)->tos;
tos = READ_ONCE(inet_sk(sk)->tos);
if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos))
tos = (tcp_rsk(req)->syn_tos & ~INET_ECN_MASK) |
(tos & INET_ECN_MASK);
if (!INET_ECN_is_capable(tos) &&
tcp_bpf_ca_needs_ecn((struct sock *)req))