bpf, sockmap: Fix missing BPF_F_INGRESS flag when using apply_bytes

When redirecting, we use sk_msg_to_ingress() to get the BPF_F_INGRESS
flag from the msg->flags. If apply_bytes is used and it is larger than
the current data being processed, sk_psock_msg_verdict() will not be
called when sendmsg() is called again. At this time, the msg->flags is 0,
and we lost the BPF_F_INGRESS flag.

So we need to save the BPF_F_INGRESS flag in sk_psock and use it when
redirection.

Fixes: 8934ce2f ("bpf: sockmap redirect ingress support")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/1669718441-2654-3-git-send-email-yangpc@wangsu.com

include/linux/skmsg.h

@@ -82,6 +82,7 @@ struct sk_psock {
 	u32				apply_bytes;
 	u32				cork_bytes;
 	u32				eval;
+	bool				redir_ingress; /* undefined if sk_redir is null */
 	struct sk_msg			*cork;
 	struct sk_psock_progs		progs;
 #if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)

include/net/tcp.h

@@ -2319,8 +2319,8 @@ int tcp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
 void tcp_bpf_clone(const struct sock *sk, struct sock *newsk);
 #endif /* CONFIG_BPF_SYSCALL */
 
-int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg, u32 bytes,
-			  int flags);
+int tcp_bpf_sendmsg_redir(struct sock *sk, bool ingress,
+			  struct sk_msg *msg, u32 bytes, int flags);
 #endif /* CONFIG_NET_SOCK_MSG */
 
 #if !defined(CONFIG_BPF_SYSCALL) || !defined(CONFIG_NET_SOCK_MSG)

net/core/skmsg.c

@@ -886,13 +886,16 @@ int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
 	ret = sk_psock_map_verd(ret, msg->sk_redir);
 	psock->apply_bytes = msg->apply_bytes;
 	if (ret == __SK_REDIRECT) {
-		if (psock->sk_redir)
+		if (psock->sk_redir) {
 			sock_put(psock->sk_redir);
-		psock->sk_redir = msg->sk_redir;
-		if (!psock->sk_redir) {
+			psock->sk_redir = NULL;
+		}
+		if (!msg->sk_redir) {
 			ret = __SK_DROP;
 			goto out;
 		}
+		psock->redir_ingress = sk_msg_to_ingress(msg);
+		psock->sk_redir = msg->sk_redir;
 		sock_hold(psock->sk_redir);
 	}
 out:

net/ipv4/tcp_bpf.c

@@ -131,10 +131,9 @@ static int tcp_bpf_push_locked(struct sock *sk, struct sk_msg *msg,
 	return ret;
 }
 
-int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg,
-			  u32 bytes, int flags)
+int tcp_bpf_sendmsg_redir(struct sock *sk, bool ingress,
+			  struct sk_msg *msg, u32 bytes, int flags)
 {
-	bool ingress = sk_msg_to_ingress(msg);
 	struct sk_psock *psock = sk_psock_get(sk);
 	int ret;
 
@@ -276,7 +275,7 @@ static int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
 				struct sk_msg *msg, int *copied, int flags)
 {
-	bool cork = false, enospc = sk_msg_full(msg);
+	bool cork = false, enospc = sk_msg_full(msg), redir_ingress;
 	struct sock *sk_redir;
 	u32 tosend, origsize, sent, delta = 0;
 	u32 eval;
@@ -322,6 +321,7 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
 		sk_msg_apply_bytes(psock, tosend);
 		break;
 	case __SK_REDIRECT:
+		redir_ingress = psock->redir_ingress;
 		sk_redir = psock->sk_redir;
 		sk_msg_apply_bytes(psock, tosend);
 		if (!psock->apply_bytes) {
@@ -338,7 +338,8 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
 		release_sock(sk);
 
 		origsize = msg->sg.size;
-		ret = tcp_bpf_sendmsg_redir(sk_redir, msg, tosend, flags);
+		ret = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,
+					    msg, tosend, flags);
 		sent = origsize - msg->sg.size;
 
 		if (eval == __SK_REDIRECT)

net/tls/tls_sw.c

@@ -792,7 +792,7 @@ static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
 	struct sk_psock *psock;
 	struct sock *sk_redir;
 	struct tls_rec *rec;
-	bool enospc, policy;
+	bool enospc, policy, redir_ingress;
 	int err = 0, send;
 	u32 delta = 0;
 
@@ -837,6 +837,7 @@ static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
 		}
 		break;
 	case __SK_REDIRECT:
+		redir_ingress = psock->redir_ingress;
 		sk_redir = psock->sk_redir;
 		memcpy(&msg_redir, msg, sizeof(*msg));
 		if (msg->apply_bytes < send)
@@ -846,7 +847,8 @@ static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
 		sk_msg_return_zero(sk, msg, send);
 		msg->sg.size -= send;
 		release_sock(sk);
-		err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags);
+		err = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,
+					    &msg_redir, send, flags);
 		lock_sock(sk);
 		if (err < 0) {
 			*copied -= sk_msg_free_nocharge(sk, &msg_redir);