From ed43e76cdcc497e2b27d84db27e7df5612be2643 Mon Sep 17 00:00:00 2001 From: Jason Xing Date: Mon, 26 Feb 2024 11:22:21 +0800 Subject: tcp: directly drop skb in cookie check for ipv6 Like previous patch does, only moving skb drop logical code to cookie_v6_check() for later refinement. Signed-off-by: Jason Xing Reviewed-by: Eric Dumazet Reviewed-by: David Ahern Reviewed-by: Kuniyuki Iwashima Signed-off-by: David S. Miller --- net/ipv6/syncookies.c | 4 ++++ net/ipv6/tcp_ipv6.c | 5 +---- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index 6b9c69278819..ea0d9954a29f 100644 --- a/net/ipv6/syncookies.c +++ b/net/ipv6/syncookies.c @@ -177,6 +177,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) struct sock *ret = sk; __u8 rcv_wscale; int full_space; + SKB_DR(reason); if (!READ_ONCE(net->ipv4.sysctl_tcp_syncookies) || !th->ack || th->rst) @@ -256,10 +257,13 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) ireq->ecn_ok &= cookie_ecn_ok(net, dst); ret = tcp_get_cookie_sock(sk, skb, req, dst); + if (!ret) + goto out_drop; out: return ret; out_free: reqsk_free(req); out_drop: + kfree_skb_reason(skb, reason); return NULL; } diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 57b25b1fc9d9..0c180bb8187f 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1653,11 +1653,8 @@ int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) if (sk->sk_state == TCP_LISTEN) { struct sock *nsk = tcp_v6_cookie_check(sk, skb); - if (!nsk) - goto discard; - if (nsk != sk) { - if (tcp_child_process(sk, nsk, skb)) + if (nsk && tcp_child_process(sk, nsk, skb)) goto reset; if (opt_skb) __kfree_skb(opt_skb); -- cgit v1.2.3