[linux-2.6-block.git] / include / linux / skmsg.h

/* 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];
};

/* UAPI in filter.c depends on struct sk_msg_sg being first element. */
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;
	dst->sg.size		   += 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 bool sk_msg_full(const struct sk_msg *msg)
{
	return (msg->sg.end == msg->sg.start) && msg->sg.size;
}

static inline u32 sk_msg_elem_used(const struct sk_msg *msg)
{
	if (sk_msg_full(msg))
		return MAX_MSG_FRAGS;

	return msg->sg.end >= msg->sg.start ?
		msg->sg.end - msg->sg.start :
		msg->sg.end + (MAX_MSG_FRAGS - msg->sg.start);
}

static inline struct scatterlist *sk_msg_elem(struct sk_msg *msg, int which)
{
	return &msg->sg.data[which];
}

static inline struct scatterlist sk_msg_elem_cpy(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 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_checked(struct sock *sk)
{
	struct sk_psock *psock;

	rcu_read_lock();
	psock = sk_psock(sk);
	if (psock) {
		if (sk->sk_prot->recvmsg != tcp_bpf_recvmsg) {
			psock = ERR_PTR(-EBUSY);
			goto out;
		}

		if (!refcount_inc_not_zero(&psock->refcnt))
			psock = ERR_PTR(-EBUSY);
	}
out:
	rcu_read_unlock();
	return psock;
}

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 sk_psock_data_ready(struct sock *sk, struct sk_psock *psock)
{
	if (psock->parser.enabled)
		psock->parser.saved_data_ready(sk);
	else
		sk->sk_data_ready(sk);
}

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 */
Commit	Line	Data
604326b4 DB	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/* Copyright (c) 2017 - 2018 Covalent IO, Inc. http://covalent.io */
	3
	4	#ifndef _LINUX_SKMSG_H
	5	#define _LINUX_SKMSG_H
	6
	7	#include <linux/bpf.h>
	8	#include <linux/filter.h>
	9	#include <linux/scatterlist.h>
	10	#include <linux/skbuff.h>
	11
	12	#include <net/sock.h>
	13	#include <net/tcp.h>
	14	#include <net/strparser.h>
	15
	16	#define MAX_MSG_FRAGS MAX_SKB_FRAGS
	17
	18	enum __sk_action {
	19	__SK_DROP = 0,
	20	__SK_PASS,
	21	__SK_REDIRECT,
	22	__SK_NONE,
	23	};
	24
	25	struct sk_msg_sg {
	26	u32 start;
	27	u32 curr;
	28	u32 end;
	29	u32 size;
	30	u32 copybreak;
	31	bool copy[MAX_MSG_FRAGS];
d3b18ad3 JF	32	/* The extra element is used for chaining the front and sections when
	33	* the list becomes partitioned (e.g. end < start). The crypto APIs
	34	* require the chaining.
	35	*/
	36	struct scatterlist data[MAX_MSG_FRAGS + 1];
604326b4 DB	37	};
604326b4 DB	38
7a69c0f2	39	/* UAPI in filter.c depends on struct sk_msg_sg being first element. */
604326b4 DB	40	struct sk_msg {
	41	struct sk_msg_sg sg;
	42	void *data;
	43	void *data_end;
	44	u32 apply_bytes;
	45	u32 cork_bytes;
	46	u32 flags;
	47	struct sk_buff *skb;
	48	struct sock *sk_redir;
	49	struct sock *sk;
	50	struct list_head list;
	51	};
	52
	53	struct sk_psock_progs {
	54	struct bpf_prog *msg_parser;
	55	struct bpf_prog *skb_parser;
	56	struct bpf_prog *skb_verdict;
	57	};
	58
	59	enum sk_psock_state_bits {
	60	SK_PSOCK_TX_ENABLED,
	61	};
	62
	63	struct sk_psock_link {
	64	struct list_head list;
	65	struct bpf_map *map;
	66	void *link_raw;
	67	};
	68
	69	struct sk_psock_parser {
	70	struct strparser strp;
	71	bool enabled;
	72	void (saved_data_ready)(struct sock sk);
	73	};
	74
	75	struct sk_psock_work_state {
	76	struct sk_buff *skb;
	77	u32 len;
	78	u32 off;
	79	};
	80
	81	struct sk_psock {
	82	struct sock *sk;
	83	struct sock *sk_redir;
	84	u32 apply_bytes;
	85	u32 cork_bytes;
	86	u32 eval;
	87	struct sk_msg *cork;
	88	struct sk_psock_progs progs;
	89	struct sk_psock_parser parser;
	90	struct sk_buff_head ingress_skb;
	91	struct list_head ingress_msg;
	92	unsigned long state;
	93	struct list_head link;
	94	spinlock_t link_lock;
	95	refcount_t refcnt;
	96	void (saved_unhash)(struct sock sk);
	97	void (saved_close)(struct sock sk, long timeout);
	98	void (saved_write_space)(struct sock sk);
	99	struct proto *sk_proto;
	100	struct sk_psock_work_state work_state;
	101	struct work_struct work;
	102	union {
	103	struct rcu_head rcu;
104	struct work_struct gc;
105	};
106	};
107
108	int sk_msg_alloc(struct sock sk, struct sk_msg msg, int len,
109	int elem_first_coalesce);
d829e9c4 DB	110	int sk_msg_clone(struct sock sk, struct sk_msg dst, struct sk_msg *src,
d829e9c4 DB	111	u32 off, u32 len);
604326b4 DB	112	void sk_msg_trim(struct sock sk, struct sk_msg msg, int len);
	113	int sk_msg_free(struct sock sk, struct sk_msg msg);
	114	int sk_msg_free_nocharge(struct sock sk, struct sk_msg msg);
	115	void sk_msg_free_partial(struct sock sk, struct sk_msg msg, u32 bytes);
	116	void sk_msg_free_partial_nocharge(struct sock sk, struct sk_msg msg,
	117	u32 bytes);
	118
	119	void sk_msg_return(struct sock sk, struct sk_msg msg, int bytes);
d3b18ad3	120	void sk_msg_return_zero(struct sock sk, struct sk_msg msg, int bytes);
604326b4 DB	121
	122	int sk_msg_zerocopy_from_iter(struct sock sk, struct iov_iter from,
	123	struct sk_msg *msg, u32 bytes);
	124	int sk_msg_memcopy_from_iter(struct sock sk, struct iov_iter from,
	125	struct sk_msg *msg, u32 bytes);
	126
	127	static inline void sk_msg_check_to_free(struct sk_msg *msg, u32 i, u32 bytes)
	128	{
	129	WARN_ON(i == msg->sg.end && bytes);
	130	}
	131
	132	static inline void sk_msg_apply_bytes(struct sk_psock *psock, u32 bytes)
	133	{
	134	if (psock->apply_bytes) {
	135	if (psock->apply_bytes < bytes)
	136	psock->apply_bytes = 0;
	137	else
	138	psock->apply_bytes -= bytes;
	139	}
	140	}
	141
	142	#define sk_msg_iter_var_prev(var) \
	143	do { \
	144	if (var == 0) \
	145	var = MAX_MSG_FRAGS - 1; \
	146	else \
	147	var--; \
	148	} while (0)
	149
	150	#define sk_msg_iter_var_next(var) \
	151	do { \
	152	var++; \
	153	if (var == MAX_MSG_FRAGS) \
	154	var = 0; \
	155	} while (0)
	156
	157	#define sk_msg_iter_prev(msg, which) \
	158	sk_msg_iter_var_prev(msg->sg.which)
	159
	160	#define sk_msg_iter_next(msg, which) \
	161	sk_msg_iter_var_next(msg->sg.which)
	162
	163	static inline void sk_msg_clear_meta(struct sk_msg *msg)
	164	{
	165	memset(&msg->sg, 0, offsetofend(struct sk_msg_sg, copy));
	166	}
	167
	168	static inline void sk_msg_init(struct sk_msg *msg)
	169	{
d3b18ad3	170	BUILD_BUG_ON(ARRAY_SIZE(msg->sg.data) - 1 != MAX_MSG_FRAGS);
604326b4	171	memset(msg, 0, sizeof(*msg));
d3b18ad3	172	sg_init_marker(msg->sg.data, MAX_MSG_FRAGS);
604326b4 DB	173	}
	174
	175	static inline void sk_msg_xfer(struct sk_msg dst, struct sk_msg src,
	176	int which, u32 size)
	177	{
	178	dst->sg.data[which] = src->sg.data[which];
	179	dst->sg.data[which].length = size;
3f4c3127	180	dst->sg.size += size;
604326b4 DB	181	src->sg.data[which].length -= size;
	182	src->sg.data[which].offset += size;
	183	}
	184
d3b18ad3 JF	185	static inline void sk_msg_xfer_full(struct sk_msg dst, struct sk_msg src)
	186	{
	187	memcpy(dst, src, sizeof(*src));
	188	sk_msg_init(src);
	189	}
	190
8734a162 JF	191	static inline bool sk_msg_full(const struct sk_msg *msg)
	192	{
	193	return (msg->sg.end == msg->sg.start) && msg->sg.size;
	194	}
	195
604326b4 DB	196	static inline u32 sk_msg_elem_used(const struct sk_msg *msg)
604326b4 DB	197	{
8734a162 JF	198	if (sk_msg_full(msg))
	199	return MAX_MSG_FRAGS;
	200
604326b4 DB	201	return msg->sg.end >= msg->sg.start ?
	202	msg->sg.end - msg->sg.start :
	203	msg->sg.end + (MAX_MSG_FRAGS - msg->sg.start);
	204	}
	205
604326b4 DB	206	static inline struct scatterlist sk_msg_elem(struct sk_msg msg, int which)
	207	{
	208	return &msg->sg.data[which];
	209	}
	210
6fff607e JF	211	static inline struct scatterlist sk_msg_elem_cpy(struct sk_msg *msg, int which)
	212	{
	213	return msg->sg.data[which];
	214	}
	215
604326b4 DB	216	static inline struct page sk_msg_page(struct sk_msg msg, int which)
	217	{
	218	return sg_page(sk_msg_elem(msg, which));
	219	}
	220
	221	static inline bool sk_msg_to_ingress(const struct sk_msg *msg)
	222	{
	223	return msg->flags & BPF_F_INGRESS;
	224	}
	225
	226	static inline void sk_msg_compute_data_pointers(struct sk_msg *msg)
	227	{
	228	struct scatterlist *sge = sk_msg_elem(msg, msg->sg.start);
	229
	230	if (msg->sg.copy[msg->sg.start]) {
	231	msg->data = NULL;
	232	msg->data_end = NULL;
	233	} else {
	234	msg->data = sg_virt(sge);
	235	msg->data_end = msg->data + sge->length;
	236	}
	237	}
	238
	239	static inline void sk_msg_page_add(struct sk_msg msg, struct page page,
	240	u32 len, u32 offset)
	241	{
	242	struct scatterlist *sge;
	243
	244	get_page(page);
	245	sge = sk_msg_elem(msg, msg->sg.end);
	246	sg_set_page(sge, page, len, offset);
	247	sg_unmark_end(sge);
	248
	249	msg->sg.copy[msg->sg.end] = true;
	250	msg->sg.size += len;
	251	sk_msg_iter_next(msg, end);
	252	}
	253
d3b18ad3 JF	254	static inline void sk_msg_sg_copy(struct sk_msg *msg, u32 i, bool copy_state)
	255	{
	256	do {
	257	msg->sg.copy[i] = copy_state;
	258	sk_msg_iter_var_next(i);
	259	if (i == msg->sg.end)
	260	break;
	261	} while (1);
	262	}
	263
	264	static inline void sk_msg_sg_copy_set(struct sk_msg *msg, u32 start)
	265	{
	266	sk_msg_sg_copy(msg, start, true);
	267	}
	268
	269	static inline void sk_msg_sg_copy_clear(struct sk_msg *msg, u32 start)
	270	{
	271	sk_msg_sg_copy(msg, start, false);
	272	}
	273
604326b4 DB	274	static inline struct sk_psock sk_psock(const struct sock sk)
	275	{
	276	return rcu_dereference_sk_user_data(sk);
	277	}
	278
604326b4 DB	279	static inline void sk_psock_queue_msg(struct sk_psock *psock,
	280	struct sk_msg *msg)
	281	{
	282	list_add_tail(&msg->list, &psock->ingress_msg);
	283	}
	284
d3b18ad3 JF	285	static inline bool sk_psock_queue_empty(const struct sk_psock *psock)
	286	{
	287	return psock ? list_empty(&psock->ingress_msg) : true;
	288	}
	289
604326b4 DB	290	static inline void sk_psock_report_error(struct sk_psock *psock, int err)
	291	{
	292	struct sock *sk = psock->sk;
	293
	294	sk->sk_err = err;
	295	sk->sk_error_report(sk);
	296	}
	297
	298	struct sk_psock sk_psock_init(struct sock sk, int node);
	299
	300	int sk_psock_init_strp(struct sock sk, struct sk_psock psock);
	301	void sk_psock_start_strp(struct sock sk, struct sk_psock psock);
	302	void sk_psock_stop_strp(struct sock sk, struct sk_psock psock);
	303
	304	int sk_psock_msg_verdict(struct sock sk, struct sk_psock psock,
	305	struct sk_msg *msg);
	306
	307	static inline struct sk_psock_link *sk_psock_init_link(void)
	308	{
	309	return kzalloc(sizeof(struct sk_psock_link),
	310	GFP_ATOMIC \| __GFP_NOWARN);
	311	}
	312
	313	static inline void sk_psock_free_link(struct sk_psock_link *link)
	314	{
	315	kfree(link);
	316	}
	317
	318	struct sk_psock_link sk_psock_link_pop(struct sk_psock psock);
	319	#if defined(CONFIG_BPF_STREAM_PARSER)
	320	void sk_psock_unlink(struct sock sk, struct sk_psock_link link);
	321	#else
	322	static inline void sk_psock_unlink(struct sock *sk,
	323	struct sk_psock_link *link)
	324	{
	325	}
	326	#endif
	327
	328	void __sk_psock_purge_ingress_msg(struct sk_psock *psock);
	329
	330	static inline void sk_psock_cork_free(struct sk_psock *psock)
	331	{
	332	if (psock->cork) {
	333	sk_msg_free(psock->sk, psock->cork);
	334	kfree(psock->cork);
	335	psock->cork = NULL;
	336	}
	337	}
	338
	339	static inline void sk_psock_update_proto(struct sock *sk,
	340	struct sk_psock *psock,
	341	struct proto *ops)
	342	{
	343	psock->saved_unhash = sk->sk_prot->unhash;
	344	psock->saved_close = sk->sk_prot->close;
	345	psock->saved_write_space = sk->sk_write_space;
	346
	347	psock->sk_proto = sk->sk_prot;
	348	sk->sk_prot = ops;
	349	}
	350
	351	static inline void sk_psock_restore_proto(struct sock *sk,
	352	struct sk_psock *psock)
	353	{
354	if (psock->sk_proto) {
355	sk->sk_prot = psock->sk_proto;
356	psock->sk_proto = NULL;
357	}
358	}
359
360	static inline void sk_psock_set_state(struct sk_psock *psock,
361	enum sk_psock_state_bits bit)
362	{
363	set_bit(bit, &psock->state);
364	}
365
366	static inline void sk_psock_clear_state(struct sk_psock *psock,
367	enum sk_psock_state_bits bit)
368	{
369	clear_bit(bit, &psock->state);
370	}
371
372	static inline bool sk_psock_test_state(const struct sk_psock *psock,
373	enum sk_psock_state_bits bit)
374	{
375	return test_bit(bit, &psock->state);
376	}
377
5032d079 JF	378	static inline struct sk_psock sk_psock_get_checked(struct sock sk)
	379	{
	380	struct sk_psock *psock;
	381
	382	rcu_read_lock();
	383	psock = sk_psock(sk);
	384	if (psock) {
	385	if (sk->sk_prot->recvmsg != tcp_bpf_recvmsg) {
	386	psock = ERR_PTR(-EBUSY);
	387	goto out;
	388	}
	389
	390	if (!refcount_inc_not_zero(&psock->refcnt))
	391	psock = ERR_PTR(-EBUSY);
	392	}
	393	out:
	394	rcu_read_unlock();
	395	return psock;
	396	}
	397
604326b4 DB	398	static inline struct sk_psock sk_psock_get(struct sock sk)
	399	{
	400	struct sk_psock *psock;
	401
	402	rcu_read_lock();
	403	psock = sk_psock(sk);
	404	if (psock && !refcount_inc_not_zero(&psock->refcnt))
	405	psock = NULL;
	406	rcu_read_unlock();
	407	return psock;
	408	}
	409
	410	void sk_psock_stop(struct sock sk, struct sk_psock psock);
	411	void sk_psock_destroy(struct rcu_head *rcu);
	412	void sk_psock_drop(struct sock sk, struct sk_psock psock);
	413
	414	static inline void sk_psock_put(struct sock sk, struct sk_psock psock)
	415	{
	416	if (refcount_dec_and_test(&psock->refcnt))
	417	sk_psock_drop(sk, psock);
	418	}
	419
552de910 JF	420	static inline void sk_psock_data_ready(struct sock sk, struct sk_psock psock)
	421	{
	422	if (psock->parser.enabled)
	423	psock->parser.saved_data_ready(sk);
	424	else
	425	sk->sk_data_ready(sk);
	426	}
	427
604326b4 DB	428	static inline void psock_set_prog(struct bpf_prog **pprog,
	429	struct bpf_prog *prog)
	430	{
	431	prog = xchg(pprog, prog);
	432	if (prog)
	433	bpf_prog_put(prog);
	434	}
	435
	436	static inline void psock_progs_drop(struct sk_psock_progs *progs)
	437	{
	438	psock_set_prog(&progs->msg_parser, NULL);
	439	psock_set_prog(&progs->skb_parser, NULL);
	440	psock_set_prog(&progs->skb_verdict, NULL);
	441	}
	442
	443	#endif /* _LINUX_SKMSG_H */