[mirror_ubuntu-jammy-kernel.git] / net / ipv4 / bpf_tcp_ca.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook  */

#include <linux/types.h>
#include <linux/bpf_verifier.h>
#include <linux/bpf.h>
#include <linux/btf.h>
#include <linux/btf_ids.h>
#include <linux/filter.h>
#include <net/tcp.h>
#include <net/bpf_sk_storage.h>

/* "extern" is to avoid sparse warning.  It is only used in bpf_struct_ops.c. */
extern struct bpf_struct_ops bpf_tcp_congestion_ops;

static u32 optional_ops[] = {
	offsetof(struct tcp_congestion_ops, init),
	offsetof(struct tcp_congestion_ops, release),
	offsetof(struct tcp_congestion_ops, set_state),
	offsetof(struct tcp_congestion_ops, cwnd_event),
	offsetof(struct tcp_congestion_ops, in_ack_event),
	offsetof(struct tcp_congestion_ops, pkts_acked),
	offsetof(struct tcp_congestion_ops, min_tso_segs),
	offsetof(struct tcp_congestion_ops, sndbuf_expand),
	offsetof(struct tcp_congestion_ops, cong_control),
};

static u32 unsupported_ops[] = {
	offsetof(struct tcp_congestion_ops, get_info),
};

static const struct btf_type *tcp_sock_type;
static u32 tcp_sock_id, sock_id;

static int bpf_tcp_ca_init(struct btf *btf)
{
	s32 type_id;

	type_id = btf_find_by_name_kind(btf, "sock", BTF_KIND_STRUCT);
	if (type_id < 0)
		return -EINVAL;
	sock_id = type_id;

	type_id = btf_find_by_name_kind(btf, "tcp_sock", BTF_KIND_STRUCT);
	if (type_id < 0)
		return -EINVAL;
	tcp_sock_id = type_id;
	tcp_sock_type = btf_type_by_id(btf, tcp_sock_id);

	return 0;
}

static bool is_optional(u32 member_offset)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(optional_ops); i++) {
		if (member_offset == optional_ops[i])
			return true;
	}

	return false;
}

static bool is_unsupported(u32 member_offset)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(unsupported_ops); i++) {
		if (member_offset == unsupported_ops[i])
			return true;
	}

	return false;
}

extern struct btf *btf_vmlinux;

static bool bpf_tcp_ca_is_valid_access(int off, int size,
				       enum bpf_access_type type,
				       const struct bpf_prog *prog,
				       struct bpf_insn_access_aux *info)
{
	if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
		return false;
	if (type != BPF_READ)
		return false;
	if (off % size != 0)
		return false;

	if (!btf_ctx_access(off, size, type, prog, info))
		return false;

	if (info->reg_type == PTR_TO_BTF_ID && info->btf_id == sock_id)
		/* promote it to tcp_sock */
		info->btf_id = tcp_sock_id;

	return true;
}

static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
					const struct btf *btf,
					const struct btf_type *t, int off,
					int size, enum bpf_access_type atype,
					u32 *next_btf_id)
{
	size_t end;

	if (atype == BPF_READ)
		return btf_struct_access(log, btf, t, off, size, atype, next_btf_id);

	if (t != tcp_sock_type) {
		bpf_log(log, "only read is supported\n");
		return -EACCES;
	}

	switch (off) {
	case bpf_ctx_range(struct inet_connection_sock, icsk_ca_priv):
		end = offsetofend(struct inet_connection_sock, icsk_ca_priv);
		break;
	case offsetof(struct inet_connection_sock, icsk_ack.pending):
		end = offsetofend(struct inet_connection_sock,
				  icsk_ack.pending);
		break;
	case offsetof(struct tcp_sock, snd_cwnd):
		end = offsetofend(struct tcp_sock, snd_cwnd);
		break;
	case offsetof(struct tcp_sock, snd_cwnd_cnt):
		end = offsetofend(struct tcp_sock, snd_cwnd_cnt);
		break;
	case offsetof(struct tcp_sock, snd_ssthresh):
		end = offsetofend(struct tcp_sock, snd_ssthresh);
		break;
	case offsetof(struct tcp_sock, ecn_flags):
		end = offsetofend(struct tcp_sock, ecn_flags);
		break;
	default:
		bpf_log(log, "no write support to tcp_sock at off %d\n", off);
		return -EACCES;
	}

	if (off + size > end) {
		bpf_log(log,
			"write access at off %d with size %d beyond the member of tcp_sock ended at %zu\n",
			off, size, end);
		return -EACCES;
	}

	return NOT_INIT;
}

BPF_CALL_2(bpf_tcp_send_ack, struct tcp_sock *, tp, u32, rcv_nxt)
{
	/* bpf_tcp_ca prog cannot have NULL tp */
	__tcp_send_ack((struct sock *)tp, rcv_nxt);
	return 0;
}

static const struct bpf_func_proto bpf_tcp_send_ack_proto = {
	.func		= bpf_tcp_send_ack,
	.gpl_only	= false,
	/* In case we want to report error later */
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_PTR_TO_BTF_ID,
	.arg1_btf_id	= &tcp_sock_id,
	.arg2_type	= ARG_ANYTHING,
};

static u32 prog_ops_moff(const struct bpf_prog *prog)
{
	const struct btf_member *m;
	const struct btf_type *t;
	u32 midx;

	midx = prog->expected_attach_type;
	t = bpf_tcp_congestion_ops.type;
	m = &btf_type_member(t)[midx];

	return btf_member_bit_offset(t, m) / 8;
}

static const struct bpf_func_proto *
bpf_tcp_ca_get_func_proto(enum bpf_func_id func_id,
			  const struct bpf_prog *prog)
{
	switch (func_id) {
	case BPF_FUNC_tcp_send_ack:
		return &bpf_tcp_send_ack_proto;
	case BPF_FUNC_sk_storage_get:
		return &bpf_sk_storage_get_proto;
	case BPF_FUNC_sk_storage_delete:
		return &bpf_sk_storage_delete_proto;
	case BPF_FUNC_setsockopt:
		/* Does not allow release() to call setsockopt.
		 * release() is called when the current bpf-tcp-cc
		 * is retiring.  It is not allowed to call
		 * setsockopt() to make further changes which
		 * may potentially allocate new resources.
		 */
		if (prog_ops_moff(prog) !=
		    offsetof(struct tcp_congestion_ops, release))
			return &bpf_sk_setsockopt_proto;
		return NULL;
	case BPF_FUNC_getsockopt:
		/* Since get/setsockopt is usually expected to
		 * be available together, disable getsockopt for
		 * release also to avoid usage surprise.
		 * The bpf-tcp-cc already has a more powerful way
		 * to read tcp_sock from the PTR_TO_BTF_ID.
		 */
		if (prog_ops_moff(prog) !=
		    offsetof(struct tcp_congestion_ops, release))
			return &bpf_sk_getsockopt_proto;
		return NULL;
	case BPF_FUNC_ktime_get_coarse_ns:
		return &bpf_ktime_get_coarse_ns_proto;
	default:
		return bpf_base_func_proto(func_id);
	}
}

BTF_SET_START(bpf_tcp_ca_kfunc_ids)
BTF_ID(func, tcp_reno_ssthresh)
BTF_ID(func, tcp_reno_cong_avoid)
BTF_ID(func, tcp_reno_undo_cwnd)
BTF_ID(func, tcp_slow_start)
BTF_ID(func, tcp_cong_avoid_ai)
#ifdef CONFIG_X86
#ifdef CONFIG_DYNAMIC_FTRACE
#if IS_BUILTIN(CONFIG_TCP_CONG_CUBIC)
BTF_ID(func, cubictcp_init)
BTF_ID(func, cubictcp_recalc_ssthresh)
BTF_ID(func, cubictcp_cong_avoid)
BTF_ID(func, cubictcp_state)
BTF_ID(func, cubictcp_cwnd_event)
BTF_ID(func, cubictcp_acked)
#endif
#if IS_BUILTIN(CONFIG_TCP_CONG_DCTCP)
BTF_ID(func, dctcp_init)
BTF_ID(func, dctcp_update_alpha)
BTF_ID(func, dctcp_cwnd_event)
BTF_ID(func, dctcp_ssthresh)
BTF_ID(func, dctcp_cwnd_undo)
BTF_ID(func, dctcp_state)
#endif
#if IS_BUILTIN(CONFIG_TCP_CONG_BBR)
BTF_ID(func, bbr_init)
BTF_ID(func, bbr_main)
BTF_ID(func, bbr_sndbuf_expand)
BTF_ID(func, bbr_undo_cwnd)
BTF_ID(func, bbr_cwnd_event)
BTF_ID(func, bbr_ssthresh)
BTF_ID(func, bbr_min_tso_segs)
BTF_ID(func, bbr_set_state)
#endif
#endif  /* CONFIG_DYNAMIC_FTRACE */
#endif	/* CONFIG_X86 */
BTF_SET_END(bpf_tcp_ca_kfunc_ids)

static bool bpf_tcp_ca_check_kfunc_call(u32 kfunc_btf_id)
{
	return btf_id_set_contains(&bpf_tcp_ca_kfunc_ids, kfunc_btf_id);
}

static const struct bpf_verifier_ops bpf_tcp_ca_verifier_ops = {
	.get_func_proto		= bpf_tcp_ca_get_func_proto,
	.is_valid_access	= bpf_tcp_ca_is_valid_access,
	.btf_struct_access	= bpf_tcp_ca_btf_struct_access,
	.check_kfunc_call	= bpf_tcp_ca_check_kfunc_call,
};

static int bpf_tcp_ca_init_member(const struct btf_type *t,
				  const struct btf_member *member,
				  void *kdata, const void *udata)
{
	const struct tcp_congestion_ops *utcp_ca;
	struct tcp_congestion_ops *tcp_ca;
	int prog_fd;
	u32 moff;

	utcp_ca = (const struct tcp_congestion_ops *)udata;
	tcp_ca = (struct tcp_congestion_ops *)kdata;

	moff = btf_member_bit_offset(t, member) / 8;
	switch (moff) {
	case offsetof(struct tcp_congestion_ops, flags):
		if (utcp_ca->flags & ~TCP_CONG_MASK)
			return -EINVAL;
		tcp_ca->flags = utcp_ca->flags;
		return 1;
	case offsetof(struct tcp_congestion_ops, name):
		if (bpf_obj_name_cpy(tcp_ca->name, utcp_ca->name,
				     sizeof(tcp_ca->name)) <= 0)
			return -EINVAL;
		if (tcp_ca_find(utcp_ca->name))
			return -EEXIST;
		return 1;
	}

	if (!btf_type_resolve_func_ptr(btf_vmlinux, member->type, NULL))
		return 0;

	/* Ensure bpf_prog is provided for compulsory func ptr */
	prog_fd = (int)(*(unsigned long *)(udata + moff));
	if (!prog_fd && !is_optional(moff) && !is_unsupported(moff))
		return -EINVAL;

	return 0;
}

static int bpf_tcp_ca_check_member(const struct btf_type *t,
				   const struct btf_member *member)
{
	if (is_unsupported(btf_member_bit_offset(t, member) / 8))
		return -ENOTSUPP;
	return 0;
}

static int bpf_tcp_ca_reg(void *kdata)
{
	return tcp_register_congestion_control(kdata);
}

static void bpf_tcp_ca_unreg(void *kdata)
{
	tcp_unregister_congestion_control(kdata);
}

struct bpf_struct_ops bpf_tcp_congestion_ops = {
	.verifier_ops = &bpf_tcp_ca_verifier_ops,
	.reg = bpf_tcp_ca_reg,
	.unreg = bpf_tcp_ca_unreg,
	.check_member = bpf_tcp_ca_check_member,
	.init_member = bpf_tcp_ca_init_member,
	.init = bpf_tcp_ca_init,
	.name = "tcp_congestion_ops",
};
Commit	Line	Data
0baf26b0 MKL	1	// SPDX-License-Identifier: GPL-2.0
	2	/* Copyright (c) 2019 Facebook */
	3
	4	#include <linux/types.h>
	5	#include <linux/bpf_verifier.h>
	6	#include <linux/bpf.h>
	7	#include <linux/btf.h>
e78aea8b	8	#include <linux/btf_ids.h>
0baf26b0 MKL	9	#include <linux/filter.h>
0baf26b0 MKL	10	#include <net/tcp.h>
ab14fd4e	11	#include <net/bpf_sk_storage.h>
0baf26b0	12
eb18b49e MKL	13	/* "extern" is to avoid sparse warning. It is only used in bpf_struct_ops.c. */
	14	extern struct bpf_struct_ops bpf_tcp_congestion_ops;
	15
0baf26b0 MKL	16	static u32 optional_ops[] = {
	17	offsetof(struct tcp_congestion_ops, init),
	18	offsetof(struct tcp_congestion_ops, release),
	19	offsetof(struct tcp_congestion_ops, set_state),
	20	offsetof(struct tcp_congestion_ops, cwnd_event),
	21	offsetof(struct tcp_congestion_ops, in_ack_event),
	22	offsetof(struct tcp_congestion_ops, pkts_acked),
	23	offsetof(struct tcp_congestion_ops, min_tso_segs),
	24	offsetof(struct tcp_congestion_ops, sndbuf_expand),
	25	offsetof(struct tcp_congestion_ops, cong_control),
	26	};
	27
	28	static u32 unsupported_ops[] = {
	29	offsetof(struct tcp_congestion_ops, get_info),
	30	};
	31
	32	static const struct btf_type *tcp_sock_type;
	33	static u32 tcp_sock_id, sock_id;
	34
	35	static int bpf_tcp_ca_init(struct btf *btf)
	36	{
	37	s32 type_id;
	38
	39	type_id = btf_find_by_name_kind(btf, "sock", BTF_KIND_STRUCT);
	40	if (type_id < 0)
	41	return -EINVAL;
	42	sock_id = type_id;
	43
	44	type_id = btf_find_by_name_kind(btf, "tcp_sock", BTF_KIND_STRUCT);
	45	if (type_id < 0)
	46	return -EINVAL;
	47	tcp_sock_id = type_id;
	48	tcp_sock_type = btf_type_by_id(btf, tcp_sock_id);
	49
	50	return 0;
	51	}
	52
	53	static bool is_optional(u32 member_offset)
	54	{
	55	unsigned int i;
	56
	57	for (i = 0; i < ARRAY_SIZE(optional_ops); i++) {
	58	if (member_offset == optional_ops[i])
	59	return true;
	60	}
	61
	62	return false;
	63	}
	64
	65	static bool is_unsupported(u32 member_offset)
	66	{
	67	unsigned int i;
	68
	69	for (i = 0; i < ARRAY_SIZE(unsupported_ops); i++) {
	70	if (member_offset == unsupported_ops[i])
	71	return true;
	72	}
	73
	74	return false;
	75	}
	76
	77	extern struct btf *btf_vmlinux;
	78
	79	static bool bpf_tcp_ca_is_valid_access(int off, int size,
80	enum bpf_access_type type,
81	const struct bpf_prog *prog,
82	struct bpf_insn_access_aux *info)
83	{
84	if (off < 0 \|\| off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
85	return false;
86	if (type != BPF_READ)
87	return false;
88	if (off % size != 0)
89	return false;
90
91	if (!btf_ctx_access(off, size, type, prog, info))
92	return false;
93
94	if (info->reg_type == PTR_TO_BTF_ID && info->btf_id == sock_id)
95	/* promote it to tcp_sock */
96	info->btf_id = tcp_sock_id;
97
98	return true;
99	}
100
101	static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
22dc4a0f	102	const struct btf *btf,
0baf26b0 MKL	103	const struct btf_type *t, int off,
	104	int size, enum bpf_access_type atype,
	105	u32 *next_btf_id)
	106	{
	107	size_t end;
	108
	109	if (atype == BPF_READ)
22dc4a0f	110	return btf_struct_access(log, btf, t, off, size, atype, next_btf_id);
0baf26b0 MKL	111
	112	if (t != tcp_sock_type) {
	113	bpf_log(log, "only read is supported\n");
	114	return -EACCES;
	115	}
	116
	117	switch (off) {
	118	case bpf_ctx_range(struct inet_connection_sock, icsk_ca_priv):
	119	end = offsetofend(struct inet_connection_sock, icsk_ca_priv);
	120	break;
	121	case offsetof(struct inet_connection_sock, icsk_ack.pending):
	122	end = offsetofend(struct inet_connection_sock,
	123	icsk_ack.pending);
	124	break;
	125	case offsetof(struct tcp_sock, snd_cwnd):
	126	end = offsetofend(struct tcp_sock, snd_cwnd);
	127	break;
	128	case offsetof(struct tcp_sock, snd_cwnd_cnt):
	129	end = offsetofend(struct tcp_sock, snd_cwnd_cnt);
	130	break;
	131	case offsetof(struct tcp_sock, snd_ssthresh):
	132	end = offsetofend(struct tcp_sock, snd_ssthresh);
	133	break;
	134	case offsetof(struct tcp_sock, ecn_flags):
	135	end = offsetofend(struct tcp_sock, ecn_flags);
	136	break;
	137	default:
	138	bpf_log(log, "no write support to tcp_sock at off %d\n", off);
	139	return -EACCES;
	140	}
	141
	142	if (off + size > end) {
	143	bpf_log(log,
	144	"write access at off %d with size %d beyond the member of tcp_sock ended at %zu\n",
	145	off, size, end);
	146	return -EACCES;
	147	}
	148
	149	return NOT_INIT;
	150	}
	151
206057fe MKL	152	BPF_CALL_2(bpf_tcp_send_ack, struct tcp_sock *, tp, u32, rcv_nxt)
	153	{
	154	/* bpf_tcp_ca prog cannot have NULL tp */
	155	__tcp_send_ack((struct sock *)tp, rcv_nxt);
	156	return 0;
	157	}
	158
	159	static const struct bpf_func_proto bpf_tcp_send_ack_proto = {
	160	.func = bpf_tcp_send_ack,
	161	.gpl_only = false,
	162	/* In case we want to report error later */
	163	.ret_type = RET_INTEGER,
	164	.arg1_type = ARG_PTR_TO_BTF_ID,
9436ef6e	165	.arg1_btf_id = &tcp_sock_id,
206057fe	166	.arg2_type = ARG_ANYTHING,
206057fe MKL	167	};
206057fe MKL	168
eb18b49e MKL	169	static u32 prog_ops_moff(const struct bpf_prog *prog)
	170	{
	171	const struct btf_member *m;
	172	const struct btf_type *t;
	173	u32 midx;
	174
	175	midx = prog->expected_attach_type;
	176	t = bpf_tcp_congestion_ops.type;
	177	m = &btf_type_member(t)[midx];
	178
	179	return btf_member_bit_offset(t, m) / 8;
	180	}
	181
0baf26b0 MKL	182	static const struct bpf_func_proto *
	183	bpf_tcp_ca_get_func_proto(enum bpf_func_id func_id,
	184	const struct bpf_prog *prog)
	185	{
206057fe MKL	186	switch (func_id) {
	187	case BPF_FUNC_tcp_send_ack:
	188	return &bpf_tcp_send_ack_proto;
ab14fd4e	189	case BPF_FUNC_sk_storage_get:
592a3498	190	return &bpf_sk_storage_get_proto;
ab14fd4e	191	case BPF_FUNC_sk_storage_delete:
592a3498	192	return &bpf_sk_storage_delete_proto;
eb18b49e MKL	193	case BPF_FUNC_setsockopt:
	194	/* Does not allow release() to call setsockopt.
	195	* release() is called when the current bpf-tcp-cc
	196	* is retiring. It is not allowed to call
	197	* setsockopt() to make further changes which
	198	* may potentially allocate new resources.
	199	*/
	200	if (prog_ops_moff(prog) !=
	201	offsetof(struct tcp_congestion_ops, release))
	202	return &bpf_sk_setsockopt_proto;
	203	return NULL;
	204	case BPF_FUNC_getsockopt:
	205	/* Since get/setsockopt is usually expected to
	206	* be available together, disable getsockopt for
	207	* release also to avoid usage surprise.
	208	* The bpf-tcp-cc already has a more powerful way
	209	* to read tcp_sock from the PTR_TO_BTF_ID.
	210	*/
	211	if (prog_ops_moff(prog) !=
	212	offsetof(struct tcp_congestion_ops, release))
	213	return &bpf_sk_getsockopt_proto;
	214	return NULL;
727231d2 DB	215	case BPF_FUNC_ktime_get_coarse_ns:
727231d2 DB	216	return &bpf_ktime_get_coarse_ns_proto;
206057fe MKL	217	default:
	218	return bpf_base_func_proto(func_id);
	219	}
0baf26b0 MKL	220	}
0baf26b0 MKL	221
e78aea8b MKL	222	BTF_SET_START(bpf_tcp_ca_kfunc_ids)
	223	BTF_ID(func, tcp_reno_ssthresh)
	224	BTF_ID(func, tcp_reno_cong_avoid)
	225	BTF_ID(func, tcp_reno_undo_cwnd)
	226	BTF_ID(func, tcp_slow_start)
	227	BTF_ID(func, tcp_cong_avoid_ai)
569c484f	228	#ifdef CONFIG_X86
7aae231a	229	#ifdef CONFIG_DYNAMIC_FTRACE
e78aea8b MKL	230	#if IS_BUILTIN(CONFIG_TCP_CONG_CUBIC)
	231	BTF_ID(func, cubictcp_init)
	232	BTF_ID(func, cubictcp_recalc_ssthresh)
	233	BTF_ID(func, cubictcp_cong_avoid)
	234	BTF_ID(func, cubictcp_state)
	235	BTF_ID(func, cubictcp_cwnd_event)
	236	BTF_ID(func, cubictcp_acked)
	237	#endif
	238	#if IS_BUILTIN(CONFIG_TCP_CONG_DCTCP)
	239	BTF_ID(func, dctcp_init)
	240	BTF_ID(func, dctcp_update_alpha)
	241	BTF_ID(func, dctcp_cwnd_event)
	242	BTF_ID(func, dctcp_ssthresh)
	243	BTF_ID(func, dctcp_cwnd_undo)
	244	BTF_ID(func, dctcp_state)
	245	#endif
	246	#if IS_BUILTIN(CONFIG_TCP_CONG_BBR)
	247	BTF_ID(func, bbr_init)
	248	BTF_ID(func, bbr_main)
	249	BTF_ID(func, bbr_sndbuf_expand)
	250	BTF_ID(func, bbr_undo_cwnd)
21cfd2db	251	BTF_ID(func, bbr_cwnd_event)
e78aea8b MKL	252	BTF_ID(func, bbr_ssthresh)
	253	BTF_ID(func, bbr_min_tso_segs)
	254	BTF_ID(func, bbr_set_state)
	255	#endif
7aae231a	256	#endif /* CONFIG_DYNAMIC_FTRACE */
569c484f	257	#endif /* CONFIG_X86 */
e78aea8b MKL	258	BTF_SET_END(bpf_tcp_ca_kfunc_ids)
	259
	260	static bool bpf_tcp_ca_check_kfunc_call(u32 kfunc_btf_id)
	261	{
	262	return btf_id_set_contains(&bpf_tcp_ca_kfunc_ids, kfunc_btf_id);
	263	}
	264
0baf26b0 MKL	265	static const struct bpf_verifier_ops bpf_tcp_ca_verifier_ops = {
	266	.get_func_proto = bpf_tcp_ca_get_func_proto,
	267	.is_valid_access = bpf_tcp_ca_is_valid_access,
	268	.btf_struct_access = bpf_tcp_ca_btf_struct_access,
e78aea8b	269	.check_kfunc_call = bpf_tcp_ca_check_kfunc_call,
0baf26b0 MKL	270	};
	271
	272	static int bpf_tcp_ca_init_member(const struct btf_type *t,
	273	const struct btf_member *member,
	274	void kdata, const void udata)
	275	{
	276	const struct tcp_congestion_ops *utcp_ca;
	277	struct tcp_congestion_ops *tcp_ca;
0baf26b0 MKL	278	int prog_fd;
	279	u32 moff;
	280
	281	utcp_ca = (const struct tcp_congestion_ops *)udata;
	282	tcp_ca = (struct tcp_congestion_ops *)kdata;
	283
	284	moff = btf_member_bit_offset(t, member) / 8;
	285	switch (moff) {
	286	case offsetof(struct tcp_congestion_ops, flags):
	287	if (utcp_ca->flags & ~TCP_CONG_MASK)
	288	return -EINVAL;
	289	tcp_ca->flags = utcp_ca->flags;
	290	return 1;
	291	case offsetof(struct tcp_congestion_ops, name):
8e7ae251 MKL	292	if (bpf_obj_name_cpy(tcp_ca->name, utcp_ca->name,
8e7ae251 MKL	293	sizeof(tcp_ca->name)) <= 0)
0baf26b0 MKL	294	return -EINVAL;
	295	if (tcp_ca_find(utcp_ca->name))
	296	return -EEXIST;
0baf26b0 MKL	297	return 1;
	298	}
	299
	300	if (!btf_type_resolve_func_ptr(btf_vmlinux, member->type, NULL))
	301	return 0;
	302
	303	/* Ensure bpf_prog is provided for compulsory func ptr */
	304	prog_fd = (int)((unsigned long )(udata + moff));
	305	if (!prog_fd && !is_optional(moff) && !is_unsupported(moff))
	306	return -EINVAL;
	307
	308	return 0;
	309	}
	310
	311	static int bpf_tcp_ca_check_member(const struct btf_type *t,
	312	const struct btf_member *member)
	313	{
	314	if (is_unsupported(btf_member_bit_offset(t, member) / 8))
	315	return -ENOTSUPP;
	316	return 0;
	317	}
	318
	319	static int bpf_tcp_ca_reg(void *kdata)
	320	{
	321	return tcp_register_congestion_control(kdata);
	322	}
	323
	324	static void bpf_tcp_ca_unreg(void *kdata)
	325	{
	326	tcp_unregister_congestion_control(kdata);
	327	}
	328
0baf26b0 MKL	329	struct bpf_struct_ops bpf_tcp_congestion_ops = {
	330	.verifier_ops = &bpf_tcp_ca_verifier_ops,
	331	.reg = bpf_tcp_ca_reg,
	332	.unreg = bpf_tcp_ca_unreg,
	333	.check_member = bpf_tcp_ca_check_member,
	334	.init_member = bpf_tcp_ca_init_member,
	335	.init = bpf_tcp_ca_init,
	336	.name = "tcp_congestion_ops",
	337	};