[PATCH 5.9 152/252] bpf, sockmap: Ensure SO_RCVBUF memory is observed on ingress redirect

[Greg Kroah-Hartman]

From: John Fastabend <john.fastabend@xxxxxxxxx>

[ Upstream commit 36cd0e696a832a00247fca522034703566ac8885 ]

Fix sockmap sk_skb programs so that they observe sk_rcvbuf limits. This
allows users to tune SO_RCVBUF and sockmap will honor them.

We can refactor the if(charge) case out in later patches. But, keep this
fix to the point.

Fixes: 51199405f9672 ("bpf: skb_verdict, support SK_PASS on RX BPF path")
Suggested-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
Signed-off-by: John Fastabend <john.fastabend@xxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Reviewed-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/bpf/160556568657.73229.8404601585878439060.stgit@john-XPS-13-9370
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/core/skmsg.c   | 20 ++++++++++++++++----
 net/ipv4/tcp_bpf.c |  3 ++-
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 30ddca6db6c6b..f41b06e60ad90 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -170,10 +170,12 @@ static int sk_msg_free_elem(struct sock *sk, struct sk_msg *msg, u32 i,
 	struct scatterlist *sge = sk_msg_elem(msg, i);
 	u32 len = sge->length;
 
-	if (charge)
-		sk_mem_uncharge(sk, len);
-	if (!msg->skb)
+	/* When the skb owns the memory we free it from consume_skb path. */
+	if (!msg->skb) {
+		if (charge)
+			sk_mem_uncharge(sk, len);
 		put_page(sg_page(sge));
+	}
 	memset(sge, 0, sizeof(*sge));
 	return len;
 }
@@ -403,6 +405,9 @@ static int sk_psock_skb_ingress(struct sk_psock *psock, struct sk_buff *skb)
 	int copied = 0, num_sge;
 	struct sk_msg *msg;
 
+	if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
+		return -EAGAIN;
+
 	msg = kzalloc(sizeof(*msg), __GFP_NOWARN | GFP_ATOMIC);
 	if (unlikely(!msg))
 		return -EAGAIN;
@@ -418,7 +423,14 @@ static int sk_psock_skb_ingress(struct sk_psock *psock, struct sk_buff *skb)
 		return num_sge;
 	}
 
-	sk_mem_charge(sk, skb->len);
+	/* This will transition ownership of the data from the socket where
+	 * the BPF program was run initiating the redirect to the socket
+	 * we will eventually receive this data on. The data will be released
+	 * from skb_consume found in __tcp_bpf_recvmsg() after its been copied
+	 * into user buffers.
+	 */
+	skb_set_owner_r(skb, sk);
+
 	copied = skb->len;
 	msg->sg.start = 0;
 	msg->sg.size = copied;
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index d85ba32dc6e7a..24e1be45d4cd7 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -45,7 +45,8 @@ int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
 			if (likely(!peek)) {
 				sge->offset += copy;
 				sge->length -= copy;
-				sk_mem_uncharge(sk, copy);
+				if (!msg_rx->skb)
+					sk_mem_uncharge(sk, copy);
 				msg_rx->sg.size -= copy;
 
 				if (!sge->length) {
-- 
2.27.0