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We will support arbitrary SYN Cookie with BPF. If BPF prog validates ACK and kfunc allocates a reqsk, it will be carried to TCP stack as skb->sk with req->syncookie 1. Also, the reqsk has its listener as req->rsk_listener with no refcnt taken. When the TCP stack looks up a socket from the skb, we steal inet_reqsk(skb->sk)->rsk_listener in skb_steal_sock() so that the skb will be processed in cookie_v[46]_check() with the listener. Note that we do not clear skb->sk and skb->destructor so that we can carry the reqsk to cookie_v[46]_check(). Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://lore.kernel.org/r/20240115205514.68364-4-kuniyu@amazon.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
280 lines
7.4 KiB
280 lines
7.4 KiB