net/ipv4/bpf_tcp_ca.c - linux - Git at Google

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

 #include <linux/init.h>
 #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. */
 static struct bpf_struct_ops bpf_tcp_congestion_ops;

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

 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);

 	type_id = btf_find_by_name_kind(btf, "tcp_congestion_ops", BTF_KIND_STRUCT);
 	if (type_id < 0)
 		return -EINVAL;
 	tcp_congestion_ops_type = btf_type_by_id(btf, type_id);

 	return 0;
 }

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

 	if (base_type(info->reg_type) == PTR_TO_BTF_ID &&
 	    !bpf_type_has_unsafe_modifiers(info->reg_type) &&
 	    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 bpf_reg_state *reg,
 					int off, int size)
 {
 	const struct btf_type *t;
 	size_t end;

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

 	switch (off) {
 	case offsetof(struct sock, sk_pacing_rate):
 		end = offsetofend(struct sock, sk_pacing_rate);
 		break;
 	case offsetof(struct sock, sk_pacing_status):
 		end = offsetofend(struct sock, sk_pacing_status);
 		break;
 	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_cwnd_stamp):
 		end = offsetofend(struct tcp_sock, snd_cwnd_stamp);
 		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;
 	case offsetof(struct tcp_sock, app_limited):
 		end = offsetofend(struct tcp_sock, app_limited);
 		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 0;
 }

 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 = 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, prog);
 	}
 }

 BTF_KFUNCS_START(bpf_tcp_ca_check_kfunc_ids)
 BTF_ID_FLAGS(func, tcp_reno_ssthresh)
 BTF_ID_FLAGS(func, tcp_reno_cong_avoid)
 BTF_ID_FLAGS(func, tcp_reno_undo_cwnd)
 BTF_ID_FLAGS(func, tcp_slow_start)
 BTF_ID_FLAGS(func, tcp_cong_avoid_ai)
 BTF_KFUNCS_END(bpf_tcp_ca_check_kfunc_ids)

 static const struct btf_kfunc_id_set bpf_tcp_ca_kfunc_set = {
 	.owner = THIS_MODULE,
 	.set   = &bpf_tcp_ca_check_kfunc_ids,
 };

 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,
 };

 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;
 	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;
 		return 1;
 	}

 	return 0;
 }

 static int bpf_tcp_ca_reg(void *kdata, struct bpf_link *link)
 {
 	return tcp_register_congestion_control(kdata);
 }

 static void bpf_tcp_ca_unreg(void *kdata, struct bpf_link *link)
 {
 	tcp_unregister_congestion_control(kdata);
 }

 static int bpf_tcp_ca_update(void *kdata, void *old_kdata, struct bpf_link *link)
 {
 	return tcp_update_congestion_control(kdata, old_kdata);
 }

 static int bpf_tcp_ca_validate(void *kdata)
 {
 	return tcp_validate_congestion_control(kdata);
 }

 static u32 bpf_tcp_ca_ssthresh(struct sock *sk)
 {
 	return 0;
 }

 static void bpf_tcp_ca_cong_avoid(struct sock *sk, u32 ack, u32 acked)
 {
 }

 static void bpf_tcp_ca_set_state(struct sock *sk, u8 new_state)
 {
 }

 static void bpf_tcp_ca_cwnd_event(struct sock *sk, enum tcp_ca_event ev)
 {
 }

 static void bpf_tcp_ca_in_ack_event(struct sock *sk, u32 flags)
 {
 }

 static void bpf_tcp_ca_pkts_acked(struct sock *sk, const struct ack_sample *sample)
 {
 }

 static u32 bpf_tcp_ca_min_tso_segs(struct sock *sk)
 {
 	return 0;
 }

 static void bpf_tcp_ca_cong_control(struct sock *sk, u32 ack, int flag,
 				    const struct rate_sample *rs)
 {
 }

 static u32 bpf_tcp_ca_undo_cwnd(struct sock *sk)
 {
 	return 0;
 }

 static u32 bpf_tcp_ca_sndbuf_expand(struct sock *sk)
 {
 	return 0;
 }

 static void __bpf_tcp_ca_init(struct sock *sk)
 {
 }

 static void __bpf_tcp_ca_release(struct sock *sk)
 {
 }

 static struct tcp_congestion_ops __bpf_ops_tcp_congestion_ops = {
 	.ssthresh = bpf_tcp_ca_ssthresh,
 	.cong_avoid = bpf_tcp_ca_cong_avoid,
 	.set_state = bpf_tcp_ca_set_state,
 	.cwnd_event = bpf_tcp_ca_cwnd_event,
 	.in_ack_event = bpf_tcp_ca_in_ack_event,
 	.pkts_acked = bpf_tcp_ca_pkts_acked,
 	.min_tso_segs = bpf_tcp_ca_min_tso_segs,
 	.cong_control = bpf_tcp_ca_cong_control,
 	.undo_cwnd = bpf_tcp_ca_undo_cwnd,
 	.sndbuf_expand = bpf_tcp_ca_sndbuf_expand,

 	.init = __bpf_tcp_ca_init,
 	.release = __bpf_tcp_ca_release,
 };

 static 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,
 	.update = bpf_tcp_ca_update,
 	.init_member = bpf_tcp_ca_init_member,
 	.init = bpf_tcp_ca_init,
 	.validate = bpf_tcp_ca_validate,
 	.name = "tcp_congestion_ops",
 	.cfi_stubs = &__bpf_ops_tcp_congestion_ops,
 	.owner = THIS_MODULE,
 };

 static int __init bpf_tcp_ca_kfunc_init(void)
 {
 	int ret;

 	ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, &bpf_tcp_ca_kfunc_set);
 	ret = ret ?: register_bpf_struct_ops(&bpf_tcp_congestion_ops, tcp_congestion_ops);

 	return ret;
 }
 late_initcall(bpf_tcp_ca_kfunc_init);
	// SPDX-License-Identifier: GPL-2.0
	/* Copyright (c) 2019 Facebook */

	#include <linux/init.h>
	#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. */
	static struct bpf_struct_ops bpf_tcp_congestion_ops;

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

	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);

	type_id = btf_find_by_name_kind(btf, "tcp_congestion_ops", BTF_KIND_STRUCT);
	if (type_id < 0)
	return -EINVAL;
	tcp_congestion_ops_type = btf_type_by_id(btf, type_id);

	return 0;
	}

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

	if (base_type(info->reg_type) == PTR_TO_BTF_ID &&
	!bpf_type_has_unsafe_modifiers(info->reg_type) &&
	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 bpf_reg_state *reg,
	int off, int size)
	{
	const struct btf_type *t;
	size_t end;

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

	switch (off) {
	case offsetof(struct sock, sk_pacing_rate):
	end = offsetofend(struct sock, sk_pacing_rate);
	break;
	case offsetof(struct sock, sk_pacing_status):
	end = offsetofend(struct sock, sk_pacing_status);
	break;
	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_cwnd_stamp):
	end = offsetofend(struct tcp_sock, snd_cwnd_stamp);
	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;
	case offsetof(struct tcp_sock, app_limited):
	end = offsetofend(struct tcp_sock, app_limited);
	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 0;
	}

	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 = 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, prog);
	}
	}

	BTF_KFUNCS_START(bpf_tcp_ca_check_kfunc_ids)
	BTF_ID_FLAGS(func, tcp_reno_ssthresh)
	BTF_ID_FLAGS(func, tcp_reno_cong_avoid)
	BTF_ID_FLAGS(func, tcp_reno_undo_cwnd)
	BTF_ID_FLAGS(func, tcp_slow_start)
	BTF_ID_FLAGS(func, tcp_cong_avoid_ai)
	BTF_KFUNCS_END(bpf_tcp_ca_check_kfunc_ids)

	static const struct btf_kfunc_id_set bpf_tcp_ca_kfunc_set = {
	.owner = THIS_MODULE,
	.set = &bpf_tcp_ca_check_kfunc_ids,
	};

	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,
	};

	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;
	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;
	return 1;
	}

	return 0;
	}

	static int bpf_tcp_ca_reg(void kdata, struct bpf_link link)
	{
	return tcp_register_congestion_control(kdata);
	}

	static void bpf_tcp_ca_unreg(void kdata, struct bpf_link link)
	{
	tcp_unregister_congestion_control(kdata);
	}

	static int bpf_tcp_ca_update(void kdata, void old_kdata, struct bpf_link *link)
	{
	return tcp_update_congestion_control(kdata, old_kdata);
	}

	static int bpf_tcp_ca_validate(void *kdata)
	{
	return tcp_validate_congestion_control(kdata);
	}

	static u32 bpf_tcp_ca_ssthresh(struct sock *sk)
	{
	return 0;
	}

	static void bpf_tcp_ca_cong_avoid(struct sock *sk, u32 ack, u32 acked)
	{
	}

	static void bpf_tcp_ca_set_state(struct sock *sk, u8 new_state)
	{
	}

	static void bpf_tcp_ca_cwnd_event(struct sock *sk, enum tcp_ca_event ev)
	{
	}

	static void bpf_tcp_ca_in_ack_event(struct sock *sk, u32 flags)
	{
	}

	static void bpf_tcp_ca_pkts_acked(struct sock sk, const struct ack_sample sample)
	{
	}

	static u32 bpf_tcp_ca_min_tso_segs(struct sock *sk)
	{
	return 0;
	}

	static void bpf_tcp_ca_cong_control(struct sock *sk, u32 ack, int flag,
	const struct rate_sample *rs)
	{
	}

	static u32 bpf_tcp_ca_undo_cwnd(struct sock *sk)
	{
	return 0;
	}

	static u32 bpf_tcp_ca_sndbuf_expand(struct sock *sk)
	{
	return 0;
	}

	static void __bpf_tcp_ca_init(struct sock *sk)
	{
	}

	static void __bpf_tcp_ca_release(struct sock *sk)
	{
	}

	static struct tcp_congestion_ops __bpf_ops_tcp_congestion_ops = {
	.ssthresh = bpf_tcp_ca_ssthresh,
	.cong_avoid = bpf_tcp_ca_cong_avoid,
	.set_state = bpf_tcp_ca_set_state,
	.cwnd_event = bpf_tcp_ca_cwnd_event,
	.in_ack_event = bpf_tcp_ca_in_ack_event,
	.pkts_acked = bpf_tcp_ca_pkts_acked,
	.min_tso_segs = bpf_tcp_ca_min_tso_segs,
	.cong_control = bpf_tcp_ca_cong_control,
	.undo_cwnd = bpf_tcp_ca_undo_cwnd,
	.sndbuf_expand = bpf_tcp_ca_sndbuf_expand,

	.init = __bpf_tcp_ca_init,
	.release = __bpf_tcp_ca_release,
	};

	static 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,
	.update = bpf_tcp_ca_update,
	.init_member = bpf_tcp_ca_init_member,
	.init = bpf_tcp_ca_init,
	.validate = bpf_tcp_ca_validate,
	.name = "tcp_congestion_ops",
	.cfi_stubs = &__bpf_ops_tcp_congestion_ops,
	.owner = THIS_MODULE,
	};

	static int __init bpf_tcp_ca_kfunc_init(void)
	{
	int ret;

	ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, &bpf_tcp_ca_kfunc_set);
	ret = ret ?: register_bpf_struct_ops(&bpf_tcp_congestion_ops, tcp_congestion_ops);

	return ret;
	}
	late_initcall(bpf_tcp_ca_kfunc_init);