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| author | Jason Xing <kernelxing@tencent.com> | 2024-02-26 04:22:20 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-02-28 11:39:21 +0100 |
| commit | a4a69a3719ec55f677b8481f58215b6338b781e5 (patch) | |
| tree | e22123955eef41bde27f32175ae7f34534daf9cf /net/ipv4/syncookies.c | |
| parent | tcp: directly drop skb in cookie check for ipv4 (diff) | |
| download | linux-a4a69a3719ec55f677b8481f58215b6338b781e5.tar.xz linux-a4a69a3719ec55f677b8481f58215b6338b781e5.zip | |
tcp: use drop reasons in cookie check for ipv4
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>
Diffstat (limited to 'net/ipv4/syncookies.c')
| -rw-r--r-- | net/ipv4/syncookies.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 38f331da6677..7972ad3d7c73 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -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: |