tcp, ulp: remove ulp bits from sockmap

In order to prepare sockmap logic to be used in combination with kTLS
we need to detangle it from ULP, and further split it in later commits
into a generic API.

Joint work with John.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 10 insertions, 29 deletions

diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c
index 5d0677d808ae..de6f7a65c72b 100644
--- a/kernel/bpf/sockmap.c
+++ b/kernel/bpf/sockmap.c
@@ -182,6 +182,7 @@ enum {
 static struct proto *saved_tcpv6_prot __read_mostly;
 static DEFINE_SPINLOCK(tcpv6_prot_lock);
 static struct proto bpf_tcp_prots[SOCKMAP_NUM_PROTS][SOCKMAP_NUM_CONFIGS];
+
 static void build_protos(struct proto prot[SOCKMAP_NUM_CONFIGS],
 			 struct proto *base)
 {
@@ -239,6 +240,13 @@ static int bpf_tcp_init(struct sock *sk)
 	return 0;
 }
 
+static int __init bpf_sock_init(void)
+{
+	build_protos(bpf_tcp_prots[SOCKMAP_IPV4], &tcp_prot);
+	return 0;
+}
+core_initcall(bpf_sock_init);
+
 static void smap_release_sock(struct smap_psock *psock, struct sock *sock);
 static int free_start_sg(struct sock *sk, struct sk_msg_buff *md, bool charge);
 
@@ -413,15 +421,6 @@ enum __sk_action {
 	__SK_NONE,
 };
 
-static struct tcp_ulp_ops bpf_tcp_ulp_ops __read_mostly = {
-	.name		= "bpf_tcp",
-	.uid		= TCP_ULP_BPF,
-	.user_visible	= false,
-	.owner		= NULL,
-	.init		= bpf_tcp_init,
-	.release	= bpf_tcp_release,
-};
-
 static int memcopy_from_iter(struct sock *sk,
 			     struct sk_msg_buff *md,
 			     struct iov_iter *from, int bytes)
@@ -1236,16 +1235,6 @@ static void bpf_tcp_msg_add(struct smap_psock *psock,
 		bpf_prog_put(orig_tx_msg);
 }
 
-static int bpf_tcp_ulp_register(void)
-{
-	build_protos(bpf_tcp_prots[SOCKMAP_IPV4], &tcp_prot);
-	/* Once BPF TX ULP is registered it is never unregistered. It
-	 * will be in the ULP list for the lifetime of the system. Doing
-	 * duplicate registers is not a problem.
-	 */
-	return tcp_register_ulp(&bpf_tcp_ulp_ops);
-}
-
 static int smap_verdict_func(struct smap_psock *psock, struct sk_buff *skb)
 {
 	struct bpf_prog *prog = READ_ONCE(psock->bpf_verdict);
@@ -1491,7 +1480,7 @@ static void smap_release_sock(struct smap_psock *psock, struct sock *sock)
 {
 	if (refcount_dec_and_test(&psock->refcnt)) {
 		if (psock_is_smap_sk(sock))
-			tcp_cleanup_ulp(sock);
+			bpf_tcp_release(sock);
 		write_lock_bh(&sock->sk_callback_lock);
 		smap_stop_sock(psock, sock);
 		write_unlock_bh(&sock->sk_callback_lock);
@@ -1666,10 +1655,6 @@ static struct bpf_map *sock_map_alloc(union bpf_attr *attr)
 	    attr->value_size != 4 || attr->map_flags & ~SOCK_CREATE_FLAG_MASK)
 		return ERR_PTR(-EINVAL);
 
-	err = bpf_tcp_ulp_register();
-	if (err && err != -EEXIST)
-		return ERR_PTR(err);
-
 	stab = kzalloc(sizeof(*stab), GFP_USER);
 	if (!stab)
 		return ERR_PTR(-ENOMEM);
@@ -1951,7 +1936,7 @@ static int __sock_map_ctx_update_elem(struct bpf_map *map,
 	if (tx_msg)
 		bpf_tcp_msg_add(psock, sock, tx_msg);
 	if (new) {
-		err = tcp_set_ulp_id(sock, TCP_ULP_BPF);
+		err = bpf_tcp_init(sock);
 		if (err)
 			goto out_free;
 	}
@@ -2187,10 +2172,6 @@ static struct bpf_map *sock_hash_alloc(union bpf_attr *attr)
 		 */
 		return ERR_PTR(-E2BIG);
 
-	err = bpf_tcp_ulp_register();
-	if (err && err != -EEXIST)
-		return ERR_PTR(err);
-
 	htab = kzalloc(sizeof(*htab), GFP_USER);
 	if (!htab)
 		return ERR_PTR(-ENOMEM);