[PATCH net-next] Revert "net: init sk_cookie for inet socket"

[Yafang Shao]

This revert commit <c6849a3ac17e> ("net: init sk_cookie for inet socket")

Per discussion with Eric.

Signed-off-by: Yafang Shao <laoar.s...@gmail.com>
---
 include/linux/sock_diag.h | 9 ---------
 net/ipv4/tcp_input.c      | 8 +-------
 2 files changed, 1 insertion(+), 16 deletions(-)

diff --git a/include/linux/sock_diag.h b/include/linux/sock_diag.h
index 5c916e6..15fe980 100644
--- a/include/linux/sock_diag.h
+++ b/include/linux/sock_diag.h
@@ -25,15 +25,6 @@ struct sock_diag_handler {
 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct 
nlmsghdr *nlh));
 void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct 
nlmsghdr *nlh));
 
-static inline
-void sock_init_cookie(struct sock *sk)
-{
-       u64 res;
-
-       res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
-       atomic64_set(&sk->sk_cookie, res);
-}
-
 u64 sock_gen_cookie(struct sock *sk);
 int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie);
 void sock_diag_save_cookie(struct sock *sk, __u32 *cookie);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 17b7858..5a17cfc 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -78,7 +78,6 @@
 #include <linux/errqueue.h>
 #include <trace/events/tcp.h>
 #include <linux/static_key.h>
-#include <linux/sock_diag.h>
 
 int sysctl_tcp_max_orphans __read_mostly = NR_FILE;
 
@@ -6191,15 +6190,10 @@ struct request_sock *inet_reqsk_alloc(const struct 
request_sock_ops *ops,
 #if IS_ENABLED(CONFIG_IPV6)
                ireq->pktopts = NULL;
 #endif
+               atomic64_set(&ireq->ir_cookie, 0);
                ireq->ireq_state = TCP_NEW_SYN_RECV;
                write_pnet(&ireq->ireq_net, sock_net(sk_listener));
                ireq->ireq_family = sk_listener->sk_family;
-
-               BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
-                                       offsetof(struct sock, sk_cookie));
-               BUILD_BUG_ON(offsetof(struct inet_request_sock, ireq_net) !=
-                                       offsetof(struct sock, sk_net));
-               sock_init_cookie((struct sock *)ireq);
        }
 
        return req;
-- 
1.8.3.1