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tcp: use drop reasons in cookie check for ipv6

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Like what I did to ipv4 mode, refine this part: adding more drop
reasons for better tracing.

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 11:22:22 +08:00 committed by David S. Miller
parent ed43e76cdc
commit 253541a3c1
1 changed files with 12 additions and 4 deletions
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16
net/ipv6/syncookies.c
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@ -190,16 +190,20 @@ struct sock *cookie_v6_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);
ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
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;
}
if (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) ||
np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
@ -236,8 +240,10 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
security_req_classify_flow(req, flowi6_to_flowi_common(&fl6));
dst = ip6_dst_lookup_flow(net, sk, &fl6, final_p);
if (IS_ERR(dst))
if (IS_ERR(dst)) {
SKB_DR_SET(reason, IP_OUTNOROUTES);
goto out_free;
}
}
req->rsk_window_clamp = tp->window_clamp ? :dst_metric(dst, RTAX_WINDOW);
@ -257,8 +263,10 @@ 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)
if (!ret) {
SKB_DR_SET(reason, NO_SOCKET);
goto out_drop;
}
out:
return ret;
out_free: