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net: init sk_cookie for inet socket

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With sk_cookie we can identify a socket, that is very helpful for
traceing and statistic, i.e. tcp tracepiont and ebpf.
So we'd better init it by default for inet socket.
When using it, we just need call atomic64_read(&sk->sk_cookie).

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yafang Shao
2018-04-22 21:50:04 +08:00
committed by David S. Miller
parent ec8c360a6e
commit c6849a3ac1
2 changed files with 16 additions and 1 deletions
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8
net/ipv4/tcp_input.c
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@@ -78,6 +78,7 @@
#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;
@@ -6190,10 +6191,15 @@ 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;