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tcp: use drop reasons in cookie check for ipv4

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Now it's time to use the prepared definitions to refine this part.
Four reasons used might enough for now, I think.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Xing 2024-02-26 11:22:20 +08:00 committed by David S. Miller
parent 65be4393f3
commit a4a69a3719
1 changed files with 13 additions and 6 deletions
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19
net/ipv4/syncookies.c
View file

@ -421,8 +421,10 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
if (IS_ERR(req))
goto out;
}
if (!req)
if (!req) {
SKB_DR_SET(reason, NO_SOCKET);
goto out_drop;
}
ireq = inet_rsk(req);
@ -434,8 +436,10 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
*/
RCU_INIT_POINTER(ireq->ireq_opt, tcp_v4_save_options(net, skb));
if (security_inet_conn_request(sk, skb, req))
if (security_inet_conn_request(sk, skb, req)) {
SKB_DR_SET(reason, SECURITY_HOOK);
goto out_free;
}
tcp_ao_syncookie(sk, skb, req, AF_INET);
@ -452,8 +456,10 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
ireq->ir_loc_addr, th->source, th->dest, sk->sk_uid);
security_req_classify_flow(req, flowi4_to_flowi_common(&fl4));
rt = ip_route_output_key(net, &fl4);
if (IS_ERR(rt))
if (IS_ERR(rt)) {
SKB_DR_SET(reason, IP_OUTNOROUTES);
goto out_free;
}
/* Try to redo what tcp_v4_send_synack did. */
req->rsk_window_clamp = tp->window_clamp ? :dst_metric(&rt->dst, RTAX_WINDOW);
@ -476,10 +482,11 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
/* ip_queue_xmit() depends on our flow being setup
* Normal sockets get it right from inet_csk_route_child_sock()
*/
if (ret)
inet_sk(ret)->cork.fl.u.ip4 = fl4;
else
if (!ret) {
SKB_DR_SET(reason, NO_SOCKET);
goto out_drop;
}
inet_sk(ret)->cork.fl.u.ip4 = fl4;
out:
return ret;
out_free: