Re: [PATCH v7 bpf-next 06/11] tcp: Migrate TCP_NEW_SYN_RECV requests at retransmitting SYN+ACKs.

On 5/21/21 8:20 PM, Kuniyuki Iwashima wrote:

As with the preceding patch, this patch changes reqsk_timer_handler() to
call reuseport_migrate_sock() and inet_reqsk_clone() to migrate in-flight
requests at retransmitting SYN+ACKs. If we can select a new listener and
clone the request, we resume setting the SYN+ACK timer for the new req. If
we can set the timer, we call inet_ehash_insert() to unhash the old req and
put the new req into ehash.

...

 static void reqsk_migrate_reset(struct request_sock *req)
 {
+	req->saved_syn = NULL;
+	inet_rsk(req)->ireq_opt = NULL;
 #if IS_ENABLED(CONFIG_IPV6)
-	inet_rsk(req)->ipv6_opt = NULL;
+	inet_rsk(req)->pktopts = NULL;
 #endif
 }

This is fragile. 

Maybe instead :

#if IS_ENABLED(CONFIG_IPV6)
	inet_rsk(req)->ipv6_opt = NULL;
	inet_rsk(req)->pktopts = NULL;
#else
	inet_rsk(req)->ireq_opt = NULL;
#endif