7 files changed, 460 insertions, 62 deletions

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 9b558713447f..e60fff48288b 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -737,33 +737,18 @@ static inline void bpf_map_offload_map_free(struct bpf_map *map)
 }
 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
 
-#if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_INET)
-struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
-struct sock  *__sock_hash_lookup_elem(struct bpf_map *map, void *key);
-int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type);
-int sockmap_get_from_fd(const union bpf_attr *attr, int type,
-			struct bpf_prog *prog);
+#if defined(CONFIG_BPF_STREAM_PARSER)
+int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which);
+int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
 #else
-static inline struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
-{
-	return NULL;
-}
-
-static inline struct sock  *__sock_hash_lookup_elem(struct bpf_map *map,
-						    void *key)
-{
-	return NULL;
-}
-
-static inline int sock_map_prog(struct bpf_map *map,
-				struct bpf_prog *prog,
-				u32 type)
+static inline int sock_map_prog_update(struct bpf_map *map,
+				       struct bpf_prog *prog, u32 which)
 {
 	return -EOPNOTSUPP;
 }
 
-static inline int sockmap_get_from_fd(const union bpf_attr *attr, int type,
-				      struct bpf_prog *prog)
+static inline int sock_map_get_from_fd(const union bpf_attr *attr,
+				       struct bpf_prog *prog)
 {
 	return -EINVAL;
 }
@@ -839,6 +824,10 @@ extern const struct bpf_func_proto bpf_get_stack_proto;
 extern const struct bpf_func_proto bpf_sock_map_update_proto;
 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
+extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
+extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
+extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
+extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
 
 extern const struct bpf_func_proto bpf_get_local_storage_proto;
 
diff --git a/include/linux/bpf_types.h b/include/linux/bpf_types.h
index 5432f4c9f50e..fa48343a5ea1 100644
--- a/include/linux/bpf_types.h
+++ b/include/linux/bpf_types.h
@@ -57,7 +57,7 @@ BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY_OF_MAPS, array_of_maps_map_ops)
 BPF_MAP_TYPE(BPF_MAP_TYPE_HASH_OF_MAPS, htab_of_maps_map_ops)
 #ifdef CONFIG_NET
 BPF_MAP_TYPE(BPF_MAP_TYPE_DEVMAP, dev_map_ops)
-#if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_INET)
+#if defined(CONFIG_BPF_STREAM_PARSER)
 BPF_MAP_TYPE(BPF_MAP_TYPE_SOCKMAP, sock_map_ops)
 BPF_MAP_TYPE(BPF_MAP_TYPE_SOCKHASH, sock_hash_ops)
 #endif
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 6791a0ac0139..5771874bc01e 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -520,24 +520,6 @@ struct bpf_skb_data_end {
 	void *data_end;
 };
 
-struct sk_msg_buff {
-	void *data;
-	void *data_end;
-	__u32 apply_bytes;
-	__u32 cork_bytes;
-	int sg_copybreak;
-	int sg_start;
-	int sg_curr;
-	int sg_end;
-	struct scatterlist sg_data[MAX_SKB_FRAGS];
-	bool sg_copy[MAX_SKB_FRAGS];
-	__u32 flags;
-	struct sock *sk_redir;
-	struct sock *sk;
-	struct sk_buff *skb;
-	struct list_head list;
-};
-
 struct bpf_redirect_info {
 	u32 ifindex;
 	u32 flags;
@@ -833,9 +815,6 @@ void xdp_do_flush_map(void);
 
 void bpf_warn_invalid_xdp_action(u32 act);
 
-struct sock *do_sk_redirect_map(struct sk_buff *skb);
-struct sock *do_msg_redirect_map(struct sk_msg_buff *md);
-
 #ifdef CONFIG_INET
 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 				  struct bpf_prog *prog, struct sk_buff *skb,
diff --git a/include/linux/skmsg.h b/include/linux/skmsg.h
new file mode 100644
index 000000000000..0b919f0bc6d6
--- /dev/null
+++ b/include/linux/skmsg.h
@@ -0,0 +1,410 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2017 - 2018 Covalent IO, Inc. http://covalent.io */
+
+#ifndef _LINUX_SKMSG_H
+#define _LINUX_SKMSG_H
+
+#include <linux/bpf.h>
+#include <linux/filter.h>
+#include <linux/scatterlist.h>
+#include <linux/skbuff.h>
+
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <net/strparser.h>
+
+#define MAX_MSG_FRAGS			MAX_SKB_FRAGS
+
+enum __sk_action {
+	__SK_DROP = 0,
+	__SK_PASS,
+	__SK_REDIRECT,
+	__SK_NONE,
+};
+
+struct sk_msg_sg {
+	u32				start;
+	u32				curr;
+	u32				end;
+	u32				size;
+	u32				copybreak;
+	bool				copy[MAX_MSG_FRAGS];
+	/* The extra element is used for chaining the front and sections when
+	 * the list becomes partitioned (e.g. end < start). The crypto APIs
+	 * require the chaining.
+	 */
+	struct scatterlist		data[MAX_MSG_FRAGS + 1];
+};
+
+struct sk_msg {
+	struct sk_msg_sg		sg;
+	void				*data;
+	void				*data_end;
+	u32				apply_bytes;
+	u32				cork_bytes;
+	u32				flags;
+	struct sk_buff			*skb;
+	struct sock			*sk_redir;
+	struct sock			*sk;
+	struct list_head		list;
+};
+
+struct sk_psock_progs {
+	struct bpf_prog			*msg_parser;
+	struct bpf_prog			*skb_parser;
+	struct bpf_prog			*skb_verdict;
+};
+
+enum sk_psock_state_bits {
+	SK_PSOCK_TX_ENABLED,
+};
+
+struct sk_psock_link {
+	struct list_head		list;
+	struct bpf_map			*map;
+	void				*link_raw;
+};
+
+struct sk_psock_parser {
+	struct strparser		strp;
+	bool				enabled;
+	void (*saved_data_ready)(struct sock *sk);
+};
+
+struct sk_psock_work_state {
+	struct sk_buff			*skb;
+	u32				len;
+	u32				off;
+};
+
+struct sk_psock {
+	struct sock			*sk;
+	struct sock			*sk_redir;
+	u32				apply_bytes;
+	u32				cork_bytes;
+	u32				eval;
+	struct sk_msg			*cork;
+	struct sk_psock_progs		progs;
+	struct sk_psock_parser		parser;
+	struct sk_buff_head		ingress_skb;
+	struct list_head		ingress_msg;
+	unsigned long			state;
+	struct list_head		link;
+	spinlock_t			link_lock;
+	refcount_t			refcnt;
+	void (*saved_unhash)(struct sock *sk);
+	void (*saved_close)(struct sock *sk, long timeout);
+	void (*saved_write_space)(struct sock *sk);
+	struct proto			*sk_proto;
+	struct sk_psock_work_state	work_state;
+	struct work_struct		work;
+	union {
+		struct rcu_head		rcu;
+		struct work_struct	gc;
+	};
+};
+
+int sk_msg_alloc(struct sock *sk, struct sk_msg *msg, int len,
+		 int elem_first_coalesce);
+int sk_msg_clone(struct sock *sk, struct sk_msg *dst, struct sk_msg *src,
+		 u32 off, u32 len);
+void sk_msg_trim(struct sock *sk, struct sk_msg *msg, int len);
+int sk_msg_free(struct sock *sk, struct sk_msg *msg);
+int sk_msg_free_nocharge(struct sock *sk, struct sk_msg *msg);
+void sk_msg_free_partial(struct sock *sk, struct sk_msg *msg, u32 bytes);
+void sk_msg_free_partial_nocharge(struct sock *sk, struct sk_msg *msg,
+				  u32 bytes);
+
+void sk_msg_return(struct sock *sk, struct sk_msg *msg, int bytes);
+void sk_msg_return_zero(struct sock *sk, struct sk_msg *msg, int bytes);
+
+int sk_msg_zerocopy_from_iter(struct sock *sk, struct iov_iter *from,
+			      struct sk_msg *msg, u32 bytes);
+int sk_msg_memcopy_from_iter(struct sock *sk, struct iov_iter *from,
+			     struct sk_msg *msg, u32 bytes);
+
+static inline void sk_msg_check_to_free(struct sk_msg *msg, u32 i, u32 bytes)
+{
+	WARN_ON(i == msg->sg.end && bytes);
+}
+
+static inline void sk_msg_apply_bytes(struct sk_psock *psock, u32 bytes)
+{
+	if (psock->apply_bytes) {
+		if (psock->apply_bytes < bytes)
+			psock->apply_bytes = 0;
+		else
+			psock->apply_bytes -= bytes;
+	}
+}
+
+#define sk_msg_iter_var_prev(var)			\
+	do {						\
+		if (var == 0)				\
+			var = MAX_MSG_FRAGS - 1;	\
+		else					\
+			var--;				\
+	} while (0)
+
+#define sk_msg_iter_var_next(var)			\
+	do {						\
+		var++;					\
+		if (var == MAX_MSG_FRAGS)		\
+			var = 0;			\
+	} while (0)
+
+#define sk_msg_iter_prev(msg, which)			\
+	sk_msg_iter_var_prev(msg->sg.which)
+
+#define sk_msg_iter_next(msg, which)			\
+	sk_msg_iter_var_next(msg->sg.which)
+
+static inline void sk_msg_clear_meta(struct sk_msg *msg)
+{
+	memset(&msg->sg, 0, offsetofend(struct sk_msg_sg, copy));
+}
+
+static inline void sk_msg_init(struct sk_msg *msg)
+{
+	BUILD_BUG_ON(ARRAY_SIZE(msg->sg.data) - 1 != MAX_MSG_FRAGS);
+	memset(msg, 0, sizeof(*msg));
+	sg_init_marker(msg->sg.data, MAX_MSG_FRAGS);
+}
+
+static inline void sk_msg_xfer(struct sk_msg *dst, struct sk_msg *src,
+			       int which, u32 size)
+{
+	dst->sg.data[which] = src->sg.data[which];
+	dst->sg.data[which].length  = size;
+	src->sg.data[which].length -= size;
+	src->sg.data[which].offset += size;
+}
+
+static inline void sk_msg_xfer_full(struct sk_msg *dst, struct sk_msg *src)
+{
+	memcpy(dst, src, sizeof(*src));
+	sk_msg_init(src);
+}
+
+static inline u32 sk_msg_elem_used(const struct sk_msg *msg)
+{
+	return msg->sg.end >= msg->sg.start ?
+		msg->sg.end - msg->sg.start :
+		msg->sg.end + (MAX_MSG_FRAGS - msg->sg.start);
+}
+
+static inline bool sk_msg_full(const struct sk_msg *msg)
+{
+	return (msg->sg.end == msg->sg.start) && msg->sg.size;
+}
+
+static inline struct scatterlist *sk_msg_elem(struct sk_msg *msg, int which)
+{
+	return &msg->sg.data[which];
+}
+
+static inline struct page *sk_msg_page(struct sk_msg *msg, int which)
+{
+	return sg_page(sk_msg_elem(msg, which));
+}
+
+static inline bool sk_msg_to_ingress(const struct sk_msg *msg)
+{
+	return msg->flags & BPF_F_INGRESS;
+}
+
+static inline void sk_msg_compute_data_pointers(struct sk_msg *msg)
+{
+	struct scatterlist *sge = sk_msg_elem(msg, msg->sg.start);
+
+	if (msg->sg.copy[msg->sg.start]) {
+		msg->data = NULL;
+		msg->data_end = NULL;
+	} else {
+		msg->data = sg_virt(sge);
+		msg->data_end = msg->data + sge->length;
+	}
+}
+
+static inline void sk_msg_page_add(struct sk_msg *msg, struct page *page,
+				   u32 len, u32 offset)
+{
+	struct scatterlist *sge;
+
+	get_page(page);
+	sge = sk_msg_elem(msg, msg->sg.end);
+	sg_set_page(sge, page, len, offset);
+	sg_unmark_end(sge);
+
+	msg->sg.copy[msg->sg.end] = true;
+	msg->sg.size += len;
+	sk_msg_iter_next(msg, end);
+}
+
+static inline void sk_msg_sg_copy(struct sk_msg *msg, u32 i, bool copy_state)
+{
+	do {
+		msg->sg.copy[i] = copy_state;
+		sk_msg_iter_var_next(i);
+		if (i == msg->sg.end)
+			break;
+	} while (1);
+}
+
+static inline void sk_msg_sg_copy_set(struct sk_msg *msg, u32 start)
+{
+	sk_msg_sg_copy(msg, start, true);
+}
+
+static inline void sk_msg_sg_copy_clear(struct sk_msg *msg, u32 start)
+{
+	sk_msg_sg_copy(msg, start, false);
+}
+
+static inline struct sk_psock *sk_psock(const struct sock *sk)
+{
+	return rcu_dereference_sk_user_data(sk);
+}
+
+static inline bool sk_has_psock(struct sock *sk)
+{
+	return sk_psock(sk) != NULL && sk->sk_prot->recvmsg == tcp_bpf_recvmsg;
+}
+
+static inline void sk_psock_queue_msg(struct sk_psock *psock,
+				      struct sk_msg *msg)
+{
+	list_add_tail(&msg->list, &psock->ingress_msg);
+}
+
+static inline bool sk_psock_queue_empty(const struct sk_psock *psock)
+{
+	return psock ? list_empty(&psock->ingress_msg) : true;
+}
+
+static inline void sk_psock_report_error(struct sk_psock *psock, int err)
+{
+	struct sock *sk = psock->sk;
+
+	sk->sk_err = err;
+	sk->sk_error_report(sk);
+}
+
+struct sk_psock *sk_psock_init(struct sock *sk, int node);
+
+int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock);
+void sk_psock_start_strp(struct sock *sk, struct sk_psock *psock);
+void sk_psock_stop_strp(struct sock *sk, struct sk_psock *psock);
+
+int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
+			 struct sk_msg *msg);
+
+static inline struct sk_psock_link *sk_psock_init_link(void)
+{
+	return kzalloc(sizeof(struct sk_psock_link),
+		       GFP_ATOMIC | __GFP_NOWARN);
+}
+
+static inline void sk_psock_free_link(struct sk_psock_link *link)
+{
+	kfree(link);
+}
+
+struct sk_psock_link *sk_psock_link_pop(struct sk_psock *psock);
+#if defined(CONFIG_BPF_STREAM_PARSER)
+void sk_psock_unlink(struct sock *sk, struct sk_psock_link *link);
+#else
+static inline void sk_psock_unlink(struct sock *sk,
+				   struct sk_psock_link *link)
+{
+}
+#endif
+
+void __sk_psock_purge_ingress_msg(struct sk_psock *psock);
+
+static inline void sk_psock_cork_free(struct sk_psock *psock)
+{
+	if (psock->cork) {
+		sk_msg_free(psock->sk, psock->cork);
+		kfree(psock->cork);
+		psock->cork = NULL;
+	}
+}
+
+static inline void sk_psock_update_proto(struct sock *sk,
+					 struct sk_psock *psock,
+					 struct proto *ops)
+{
+	psock->saved_unhash = sk->sk_prot->unhash;
+	psock->saved_close = sk->sk_prot->close;
+	psock->saved_write_space = sk->sk_write_space;
+
+	psock->sk_proto = sk->sk_prot;
+	sk->sk_prot = ops;
+}
+
+static inline void sk_psock_restore_proto(struct sock *sk,
+					  struct sk_psock *psock)
+{
+	if (psock->sk_proto) {
+		sk->sk_prot = psock->sk_proto;
+		psock->sk_proto = NULL;
+	}
+}
+
+static inline void sk_psock_set_state(struct sk_psock *psock,
+				      enum sk_psock_state_bits bit)
+{
+	set_bit(bit, &psock->state);
+}
+
+static inline void sk_psock_clear_state(struct sk_psock *psock,
+					enum sk_psock_state_bits bit)
+{
+	clear_bit(bit, &psock->state);
+}
+
+static inline bool sk_psock_test_state(const struct sk_psock *psock,
+				       enum sk_psock_state_bits bit)
+{
+	return test_bit(bit, &psock->state);
+}
+
+static inline struct sk_psock *sk_psock_get(struct sock *sk)
+{
+	struct sk_psock *psock;
+
+	rcu_read_lock();
+	psock = sk_psock(sk);
+	if (psock && !refcount_inc_not_zero(&psock->refcnt))
+		psock = NULL;
+	rcu_read_unlock();
+	return psock;
+}
+
+void sk_psock_stop(struct sock *sk, struct sk_psock *psock);
+void sk_psock_destroy(struct rcu_head *rcu);
+void sk_psock_drop(struct sock *sk, struct sk_psock *psock);
+
+static inline void sk_psock_put(struct sock *sk, struct sk_psock *psock)
+{
+	if (refcount_dec_and_test(&psock->refcnt))
+		sk_psock_drop(sk, psock);
+}
+
+static inline void psock_set_prog(struct bpf_prog **pprog,
+				  struct bpf_prog *prog)
+{
+	prog = xchg(pprog, prog);
+	if (prog)
+		bpf_prog_put(prog);
+}
+
+static inline void psock_progs_drop(struct sk_psock_progs *progs)
+{
+	psock_set_prog(&progs->msg_parser, NULL);
+	psock_set_prog(&progs->skb_parser, NULL);
+	psock_set_prog(&progs->skb_verdict, NULL);
+}
+
+#endif /* _LINUX_SKMSG_H */
diff --git a/include/net/sock.h b/include/net/sock.h
index 751549ac0a84..7470c45d182d 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2214,10 +2214,6 @@ static inline struct page_frag *sk_page_frag(struct sock *sk)
 
 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag);
 
-int sk_alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
-		int sg_start, int *sg_curr, unsigned int *sg_size,
-		int first_coalesce);
-
 /*
  *	Default write policy as shown to user space via poll/select/SIGIO
  */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 0d2929223c70..3600ae0f25c3 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -858,6 +858,21 @@ static inline void bpf_compute_data_end_sk_skb(struct sk_buff *skb)
 	TCP_SKB_CB(skb)->bpf.data_end = skb->data + skb_headlen(skb);
 }
 
+static inline bool tcp_skb_bpf_ingress(const struct sk_buff *skb)
+{
+	return TCP_SKB_CB(skb)->bpf.flags & BPF_F_INGRESS;
+}
+
+static inline struct sock *tcp_skb_bpf_redirect_fetch(struct sk_buff *skb)
+{
+	return TCP_SKB_CB(skb)->bpf.sk_redir;
+}
+
+static inline void tcp_skb_bpf_redirect_clear(struct sk_buff *skb)
+{
+	TCP_SKB_CB(skb)->bpf.sk_redir = NULL;
+}
+
 #if IS_ENABLED(CONFIG_IPV6)
 /* This is the variant of inet6_iif() that must be used by TCP,
  * as TCP moves IP6CB into a different location in skb->cb[]
@@ -2057,7 +2072,6 @@ struct tcp_ulp_ops {
 int tcp_register_ulp(struct tcp_ulp_ops *type);
 void tcp_unregister_ulp(struct tcp_ulp_ops *type);
 int tcp_set_ulp(struct sock *sk, const char *name);
-int tcp_set_ulp_id(struct sock *sk, const int ulp);
 void tcp_get_available_ulp(char *buf, size_t len);
 void tcp_cleanup_ulp(struct sock *sk);
 
@@ -2065,6 +2079,18 @@ void tcp_cleanup_ulp(struct sock *sk);
 	__MODULE_INFO(alias, alias_userspace, name);		\
 	__MODULE_INFO(alias, alias_tcp_ulp, "tcp-ulp-" name)
 
+struct sk_msg;
+struct sk_psock;
+
+int tcp_bpf_init(struct sock *sk);
+void tcp_bpf_reinit(struct sock *sk);
+int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg, u32 bytes,
+			  int flags);
+int tcp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
+		    int nonblock, int flags, int *addr_len);
+int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
+		      struct msghdr *msg, int len);
+
 /* Call BPF_SOCK_OPS program that returns an int. If the return value
  * is < 0, then the BPF op failed (for example if the loaded BPF
  * program does not support the chosen operation or there is no BPF
diff --git a/include/net/tls.h b/include/net/tls.h
index 5e853835597e..bab5627ff5e3 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -39,6 +39,8 @@
 #include <linux/crypto.h>
 #include <linux/socket.h>
 #include <linux/tcp.h>
+#include <linux/skmsg.h>
+
 #include <net/tcp.h>
 #include <net/strparser.h>
 #include <crypto/aead.h>
@@ -103,15 +105,13 @@ struct tls_rec {
 	int tx_flags;
 	int inplace_crypto;
 
-	/* AAD | sg_plaintext_data | sg_tag */
-	struct scatterlist sg_plaintext_data[MAX_SKB_FRAGS + 1];
-	/* AAD | sg_encrypted_data (data contain overhead for hdr&iv&tag) */
-	struct scatterlist sg_encrypted_data[MAX_SKB_FRAGS + 1];
+	struct sk_msg msg_plaintext;
+	struct sk_msg msg_encrypted;
 
-	unsigned int sg_plaintext_size;
-	unsigned int sg_encrypted_size;
-	int sg_plaintext_num_elem;
-	int sg_encrypted_num_elem;
+	/* AAD | msg_plaintext.sg.data | sg_tag */
+	struct scatterlist sg_aead_in[2];
+	/* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
+	struct scatterlist sg_aead_out[2];
 
 	char aad_space[TLS_AAD_SPACE_SIZE];
 	struct aead_request aead_req;
@@ -142,8 +142,7 @@ struct tls_sw_context_rx {
 
 	struct strparser strp;
 	void (*saved_data_ready)(struct sock *sk);
-	unsigned int (*sk_poll)(struct file *file, struct socket *sock,
-				struct poll_table_struct *wait);
+
 	struct sk_buff *recv_pkt;
 	u8 control;
 	bool decrypted;
@@ -223,8 +222,8 @@ struct tls_context {
 
 	unsigned long flags;
 	bool in_tcp_sendpages;
+	bool pending_open_record_frags;
 
-	u16 pending_open_record_frags;
 	int (*push_pending_record)(struct sock *sk, int flags);
 
 	void (*sk_write_space)(struct sock *sk);
@@ -272,8 +271,7 @@ void tls_sw_free_resources_rx(struct sock *sk);
 void tls_sw_release_resources_rx(struct sock *sk);
 int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 		   int nonblock, int flags, int *addr_len);
-unsigned int tls_sw_poll(struct file *file, struct socket *sock,
-			 struct poll_table_struct *wait);
+bool tls_sw_stream_read(const struct sock *sk);
 ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
 			   struct pipe_inode_info *pipe,
 			   size_t len, unsigned int flags);