From: Eric Dumazet <edumazet@google.com>
Date: Thu, 7 Mar 2024 16:29:43 +0000 (+0000)
Subject: ipv6: raw: check sk->sk_rcvbuf earlier
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=026763ece881b4c636173c25d012cde085689027;p=linux.git

ipv6: raw: check sk->sk_rcvbuf earlier

There is no point cloning an skb and having to free the clone
if the receive queue of the raw socket is full.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20240307162943.2523817-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 779274055abf9..ca49e6617afaf 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -160,6 +160,13 @@ static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 		if (!raw_v6_match(net, sk, nexthdr, daddr, saddr,
 				  inet6_iif(skb), inet6_sdif(skb)))
 			continue;
+
+		if (atomic_read(&sk->sk_rmem_alloc) >=
+		    READ_ONCE(sk->sk_rcvbuf)) {
+			atomic_inc(&sk->sk_drops);
+			continue;
+		}
+
 		delivered = true;
 		switch (nexthdr) {
 		case IPPROTO_ICMPV6: