From d721812aa875a898eb38b2729abf6e96abdb357b Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 7 Mar 2024 16:30:20 +0000 Subject: [PATCH] ipv4: 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 Reviewed-by: Willem de Bruijn Link: https://lore.kernel.org/r/20240307163020.2524409-1-edumazet@google.com Signed-off-by: Jakub Kicinski --- net/ipv4/raw.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 494a6284bd7e..42ac434cfcfa 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -175,6 +175,13 @@ static int raw_v4_input(struct net *net, struct sk_buff *skb, if (!raw_v4_match(net, sk, iph->protocol, iph->saddr, iph->daddr, dif, sdif)) continue; + + if (atomic_read(&sk->sk_rmem_alloc) >= + READ_ONCE(sk->sk_rcvbuf)) { + atomic_inc(&sk->sk_drops); + continue; + } + delivered = 1; if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && ip_mc_sf_allow(sk, iph->daddr, iph->saddr,