[mirror_ubuntu-jammy-kernel.git] / kernel / bpf / helpers.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
 */
#include <linux/bpf.h>
#include <linux/rcupdate.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/topology.h>
#include <linux/ktime.h>
#include <linux/sched.h>
#include <linux/uidgid.h>
#include <linux/filter.h>
#include <linux/ctype.h>
#include <linux/jiffies.h>
#include <linux/pid_namespace.h>
#include <linux/proc_ns.h>

#include "../../lib/kstrtox.h"

/* If kernel subsystem is allowing eBPF programs to call this function,
 * inside its own verifier_ops->get_func_proto() callback it should return
 * bpf_map_lookup_elem_proto, so that verifier can properly check the arguments
 *
 * Different map implementations will rely on rcu in map methods
 * lookup/update/delete, therefore eBPF programs must run under rcu lock
 * if program is allowed to access maps, so check rcu_read_lock_held in
 * all three functions.
 */
BPF_CALL_2(bpf_map_lookup_elem, struct bpf_map *, map, void *, key)
{
	WARN_ON_ONCE(!rcu_read_lock_held());
	return (unsigned long) map->ops->map_lookup_elem(map, key);
}

const struct bpf_func_proto bpf_map_lookup_elem_proto = {
	.func		= bpf_map_lookup_elem,
	.gpl_only	= false,
	.pkt_access	= true,
	.ret_type	= RET_PTR_TO_MAP_VALUE_OR_NULL,
	.arg1_type	= ARG_CONST_MAP_PTR,
	.arg2_type	= ARG_PTR_TO_MAP_KEY,
};

BPF_CALL_4(bpf_map_update_elem, struct bpf_map *, map, void *, key,
	   void *, value, u64, flags)
{
	WARN_ON_ONCE(!rcu_read_lock_held());
	return map->ops->map_update_elem(map, key, value, flags);
}

const struct bpf_func_proto bpf_map_update_elem_proto = {
	.func		= bpf_map_update_elem,
	.gpl_only	= false,
	.pkt_access	= true,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_CONST_MAP_PTR,
	.arg2_type	= ARG_PTR_TO_MAP_KEY,
	.arg3_type	= ARG_PTR_TO_MAP_VALUE,
	.arg4_type	= ARG_ANYTHING,
};

BPF_CALL_2(bpf_map_delete_elem, struct bpf_map *, map, void *, key)
{
	WARN_ON_ONCE(!rcu_read_lock_held());
	return map->ops->map_delete_elem(map, key);
}

const struct bpf_func_proto bpf_map_delete_elem_proto = {
	.func		= bpf_map_delete_elem,
	.gpl_only	= false,
	.pkt_access	= true,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_CONST_MAP_PTR,
	.arg2_type	= ARG_PTR_TO_MAP_KEY,
};

BPF_CALL_3(bpf_map_push_elem, struct bpf_map *, map, void *, value, u64, flags)
{
	return map->ops->map_push_elem(map, value, flags);
}

const struct bpf_func_proto bpf_map_push_elem_proto = {
	.func		= bpf_map_push_elem,
	.gpl_only	= false,
	.pkt_access	= true,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_CONST_MAP_PTR,
	.arg2_type	= ARG_PTR_TO_MAP_VALUE,
	.arg3_type	= ARG_ANYTHING,
};

BPF_CALL_2(bpf_map_pop_elem, struct bpf_map *, map, void *, value)
{
	return map->ops->map_pop_elem(map, value);
}

const struct bpf_func_proto bpf_map_pop_elem_proto = {
	.func		= bpf_map_pop_elem,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_CONST_MAP_PTR,
	.arg2_type	= ARG_PTR_TO_UNINIT_MAP_VALUE,
};

BPF_CALL_2(bpf_map_peek_elem, struct bpf_map *, map, void *, value)
{
	return map->ops->map_peek_elem(map, value);
}

const struct bpf_func_proto bpf_map_peek_elem_proto = {
	.func		= bpf_map_pop_elem,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_CONST_MAP_PTR,
	.arg2_type	= ARG_PTR_TO_UNINIT_MAP_VALUE,
};

const struct bpf_func_proto bpf_get_prandom_u32_proto = {
	.func		= bpf_user_rnd_u32,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_0(bpf_get_smp_processor_id)
{
	return smp_processor_id();
}

const struct bpf_func_proto bpf_get_smp_processor_id_proto = {
	.func		= bpf_get_smp_processor_id,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_0(bpf_get_numa_node_id)
{
	return numa_node_id();
}

const struct bpf_func_proto bpf_get_numa_node_id_proto = {
	.func		= bpf_get_numa_node_id,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_0(bpf_ktime_get_ns)
{
	/* NMI safe access to clock monotonic */
	return ktime_get_mono_fast_ns();
}

const struct bpf_func_proto bpf_ktime_get_ns_proto = {
	.func		= bpf_ktime_get_ns,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_0(bpf_ktime_get_boot_ns)
{
	/* NMI safe access to clock boottime */
	return ktime_get_boot_fast_ns();
}

const struct bpf_func_proto bpf_ktime_get_boot_ns_proto = {
	.func		= bpf_ktime_get_boot_ns,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_0(bpf_get_current_pid_tgid)
{
	struct task_struct *task = current;

	if (unlikely(!task))
		return -EINVAL;

	return (u64) task->tgid << 32 | task->pid;
}

const struct bpf_func_proto bpf_get_current_pid_tgid_proto = {
	.func		= bpf_get_current_pid_tgid,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_0(bpf_get_current_uid_gid)
{
	struct task_struct *task = current;
	kuid_t uid;
	kgid_t gid;

	if (unlikely(!task))
		return -EINVAL;

	current_uid_gid(&uid, &gid);
	return (u64) from_kgid(&init_user_ns, gid) << 32 |
		     from_kuid(&init_user_ns, uid);
}

const struct bpf_func_proto bpf_get_current_uid_gid_proto = {
	.func		= bpf_get_current_uid_gid,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size)
{
	struct task_struct *task = current;

	if (unlikely(!task))
		goto err_clear;

	strncpy(buf, task->comm, size);

	/* Verifier guarantees that size > 0. For task->comm exceeding
	 * size, guarantee that buf is %NUL-terminated. Unconditionally
	 * done here to save the size test.
	 */
	buf[size - 1] = 0;
	return 0;
err_clear:
	memset(buf, 0, size);
	return -EINVAL;
}

const struct bpf_func_proto bpf_get_current_comm_proto = {
	.func		= bpf_get_current_comm,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_PTR_TO_UNINIT_MEM,
	.arg2_type	= ARG_CONST_SIZE,
};

#if defined(CONFIG_QUEUED_SPINLOCKS) || defined(CONFIG_BPF_ARCH_SPINLOCK)

static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
{
	arch_spinlock_t *l = (void *)lock;
	union {
		__u32 val;
		arch_spinlock_t lock;
	} u = { .lock = __ARCH_SPIN_LOCK_UNLOCKED };

	compiletime_assert(u.val == 0, "__ARCH_SPIN_LOCK_UNLOCKED not 0");
	BUILD_BUG_ON(sizeof(*l) != sizeof(__u32));
	BUILD_BUG_ON(sizeof(*lock) != sizeof(__u32));
	arch_spin_lock(l);
}

static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
{
	arch_spinlock_t *l = (void *)lock;

	arch_spin_unlock(l);
}

#else

static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
{
	atomic_t *l = (void *)lock;

	BUILD_BUG_ON(sizeof(*l) != sizeof(*lock));
	do {
		atomic_cond_read_relaxed(l, !VAL);
	} while (atomic_xchg(l, 1));
}

static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
{
	atomic_t *l = (void *)lock;

	atomic_set_release(l, 0);
}

#endif

static DEFINE_PER_CPU(unsigned long, irqsave_flags);

notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock)
{
	unsigned long flags;

	local_irq_save(flags);
	__bpf_spin_lock(lock);
	__this_cpu_write(irqsave_flags, flags);
	return 0;
}

const struct bpf_func_proto bpf_spin_lock_proto = {
	.func		= bpf_spin_lock,
	.gpl_only	= false,
	.ret_type	= RET_VOID,
	.arg1_type	= ARG_PTR_TO_SPIN_LOCK,
};

notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock)
{
	unsigned long flags;

	flags = __this_cpu_read(irqsave_flags);
	__bpf_spin_unlock(lock);
	local_irq_restore(flags);
	return 0;
}

const struct bpf_func_proto bpf_spin_unlock_proto = {
	.func		= bpf_spin_unlock,
	.gpl_only	= false,
	.ret_type	= RET_VOID,
	.arg1_type	= ARG_PTR_TO_SPIN_LOCK,
};

void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
			   bool lock_src)
{
	struct bpf_spin_lock *lock;

	if (lock_src)
		lock = src + map->spin_lock_off;
	else
		lock = dst + map->spin_lock_off;
	preempt_disable();
	____bpf_spin_lock(lock);
	copy_map_value(map, dst, src);
	____bpf_spin_unlock(lock);
	preempt_enable();
}

BPF_CALL_0(bpf_jiffies64)
{
	return get_jiffies_64();
}

const struct bpf_func_proto bpf_jiffies64_proto = {
	.func		= bpf_jiffies64,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

#ifdef CONFIG_CGROUPS
BPF_CALL_0(bpf_get_current_cgroup_id)
{
	struct cgroup *cgrp = task_dfl_cgroup(current);

	return cgroup_id(cgrp);
}

const struct bpf_func_proto bpf_get_current_cgroup_id_proto = {
	.func		= bpf_get_current_cgroup_id,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_1(bpf_get_current_ancestor_cgroup_id, int, ancestor_level)
{
	struct cgroup *cgrp = task_dfl_cgroup(current);
	struct cgroup *ancestor;

	ancestor = cgroup_ancestor(cgrp, ancestor_level);
	if (!ancestor)
		return 0;
	return cgroup_id(ancestor);
}

const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto = {
	.func		= bpf_get_current_ancestor_cgroup_id,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_ANYTHING,
};

#ifdef CONFIG_CGROUP_BPF
DECLARE_PER_CPU(struct bpf_cgroup_storage*,
		bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);

BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags)
{
	/* flags argument is not used now,
	 * but provides an ability to extend the API.
	 * verifier checks that its value is correct.
	 */
	enum bpf_cgroup_storage_type stype = cgroup_storage_type(map);
	struct bpf_cgroup_storage *storage;
	void *ptr;

	storage = this_cpu_read(bpf_cgroup_storage[stype]);

	if (stype == BPF_CGROUP_STORAGE_SHARED)
		ptr = &READ_ONCE(storage->buf)->data[0];
	else
		ptr = this_cpu_ptr(storage->percpu_buf);

	return (unsigned long)ptr;
}

const struct bpf_func_proto bpf_get_local_storage_proto = {
	.func		= bpf_get_local_storage,
	.gpl_only	= false,
	.ret_type	= RET_PTR_TO_MAP_VALUE,
	.arg1_type	= ARG_CONST_MAP_PTR,
	.arg2_type	= ARG_ANYTHING,
};
#endif

#define BPF_STRTOX_BASE_MASK 0x1F

static int __bpf_strtoull(const char *buf, size_t buf_len, u64 flags,
			  unsigned long long *res, bool *is_negative)
{
	unsigned int base = flags & BPF_STRTOX_BASE_MASK;
	const char *cur_buf = buf;
	size_t cur_len = buf_len;
	unsigned int consumed;
	size_t val_len;
	char str[64];

	if (!buf || !buf_len || !res || !is_negative)
		return -EINVAL;

	if (base != 0 && base != 8 && base != 10 && base != 16)
		return -EINVAL;

	if (flags & ~BPF_STRTOX_BASE_MASK)
		return -EINVAL;

	while (cur_buf < buf + buf_len && isspace(*cur_buf))
		++cur_buf;

	*is_negative = (cur_buf < buf + buf_len && *cur_buf == '-');
	if (*is_negative)
		++cur_buf;

	consumed = cur_buf - buf;
	cur_len -= consumed;
	if (!cur_len)
		return -EINVAL;

	cur_len = min(cur_len, sizeof(str) - 1);
	memcpy(str, cur_buf, cur_len);
	str[cur_len] = '\0';
	cur_buf = str;

	cur_buf = _parse_integer_fixup_radix(cur_buf, &base);
	val_len = _parse_integer(cur_buf, base, res);

	if (val_len & KSTRTOX_OVERFLOW)
		return -ERANGE;

	if (val_len == 0)
		return -EINVAL;

	cur_buf += val_len;
	consumed += cur_buf - str;

	return consumed;
}

static int __bpf_strtoll(const char *buf, size_t buf_len, u64 flags,
			 long long *res)
{
	unsigned long long _res;
	bool is_negative;
	int err;

	err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
	if (err < 0)
		return err;
	if (is_negative) {
		if ((long long)-_res > 0)
			return -ERANGE;
		*res = -_res;
	} else {
		if ((long long)_res < 0)
			return -ERANGE;
		*res = _res;
	}
	return err;
}

BPF_CALL_4(bpf_strtol, const char *, buf, size_t, buf_len, u64, flags,
	   long *, res)
{
	long long _res;
	int err;

	err = __bpf_strtoll(buf, buf_len, flags, &_res);
	if (err < 0)
		return err;
	if (_res != (long)_res)
		return -ERANGE;
	*res = _res;
	return err;
}

const struct bpf_func_proto bpf_strtol_proto = {
	.func		= bpf_strtol,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_PTR_TO_MEM,
	.arg2_type	= ARG_CONST_SIZE,
	.arg3_type	= ARG_ANYTHING,
	.arg4_type	= ARG_PTR_TO_LONG,
};

BPF_CALL_4(bpf_strtoul, const char *, buf, size_t, buf_len, u64, flags,
	   unsigned long *, res)
{
	unsigned long long _res;
	bool is_negative;
	int err;

	err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
	if (err < 0)
		return err;
	if (is_negative)
		return -EINVAL;
	if (_res != (unsigned long)_res)
		return -ERANGE;
	*res = _res;
	return err;
}

const struct bpf_func_proto bpf_strtoul_proto = {
	.func		= bpf_strtoul,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_PTR_TO_MEM,
	.arg2_type	= ARG_CONST_SIZE,
	.arg3_type	= ARG_ANYTHING,
	.arg4_type	= ARG_PTR_TO_LONG,
};
#endif

BPF_CALL_4(bpf_get_ns_current_pid_tgid, u64, dev, u64, ino,
	   struct bpf_pidns_info *, nsdata, u32, size)
{
	struct task_struct *task = current;
	struct pid_namespace *pidns;
	int err = -EINVAL;

	if (unlikely(size != sizeof(struct bpf_pidns_info)))
		goto clear;

	if (unlikely((u64)(dev_t)dev != dev))
		goto clear;

	if (unlikely(!task))
		goto clear;

	pidns = task_active_pid_ns(task);
	if (unlikely(!pidns)) {
		err = -ENOENT;
		goto clear;
	}

	if (!ns_match(&pidns->ns, (dev_t)dev, ino))
		goto clear;

	nsdata->pid = task_pid_nr_ns(task, pidns);
	nsdata->tgid = task_tgid_nr_ns(task, pidns);
	return 0;
clear:
	memset((void *)nsdata, 0, (size_t) size);
	return err;
}

const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto = {
	.func		= bpf_get_ns_current_pid_tgid,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_ANYTHING,
	.arg2_type	= ARG_ANYTHING,
	.arg3_type      = ARG_PTR_TO_UNINIT_MEM,
	.arg4_type      = ARG_CONST_SIZE,
};

static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
	.func		= bpf_get_raw_cpu_id,
	.gpl_only	= false,
	.ret_type	= RET_INTEGER,
};

BPF_CALL_5(bpf_event_output_data, void *, ctx, struct bpf_map *, map,
	   u64, flags, void *, data, u64, size)
{
	if (unlikely(flags & ~(BPF_F_INDEX_MASK)))
		return -EINVAL;

	return bpf_event_output(map, flags, data, size, NULL, 0, NULL);
}

const struct bpf_func_proto bpf_event_output_data_proto =  {
	.func		= bpf_event_output_data,
	.gpl_only       = true,
	.ret_type       = RET_INTEGER,
	.arg1_type      = ARG_PTR_TO_CTX,
	.arg2_type      = ARG_CONST_MAP_PTR,
	.arg3_type      = ARG_ANYTHING,
	.arg4_type      = ARG_PTR_TO_MEM,
	.arg5_type      = ARG_CONST_SIZE_OR_ZERO,
};

const struct bpf_func_proto bpf_get_current_task_proto __weak;
const struct bpf_func_proto bpf_probe_read_user_proto __weak;
const struct bpf_func_proto bpf_probe_read_user_str_proto __weak;
const struct bpf_func_proto bpf_probe_read_kernel_proto __weak;
const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak;

const struct bpf_func_proto *
bpf_base_func_proto(enum bpf_func_id func_id)
{
	switch (func_id) {
	case BPF_FUNC_map_lookup_elem:
		return &bpf_map_lookup_elem_proto;
	case BPF_FUNC_map_update_elem:
		return &bpf_map_update_elem_proto;
	case BPF_FUNC_map_delete_elem:
		return &bpf_map_delete_elem_proto;
	case BPF_FUNC_map_push_elem:
		return &bpf_map_push_elem_proto;
	case BPF_FUNC_map_pop_elem:
		return &bpf_map_pop_elem_proto;
	case BPF_FUNC_map_peek_elem:
		return &bpf_map_peek_elem_proto;
	case BPF_FUNC_get_prandom_u32:
		return &bpf_get_prandom_u32_proto;
	case BPF_FUNC_get_smp_processor_id:
		return &bpf_get_raw_smp_processor_id_proto;
	case BPF_FUNC_get_numa_node_id:
		return &bpf_get_numa_node_id_proto;
	case BPF_FUNC_tail_call:
		return &bpf_tail_call_proto;
	case BPF_FUNC_ktime_get_ns:
		return &bpf_ktime_get_ns_proto;
	case BPF_FUNC_ktime_get_boot_ns:
		return &bpf_ktime_get_boot_ns_proto;
	case BPF_FUNC_ringbuf_output:
		return &bpf_ringbuf_output_proto;
	case BPF_FUNC_ringbuf_reserve:
		return &bpf_ringbuf_reserve_proto;
	case BPF_FUNC_ringbuf_submit:
		return &bpf_ringbuf_submit_proto;
	case BPF_FUNC_ringbuf_discard:
		return &bpf_ringbuf_discard_proto;
	case BPF_FUNC_ringbuf_query:
		return &bpf_ringbuf_query_proto;
	default:
		break;
	}

	if (!bpf_capable())
		return NULL;

	switch (func_id) {
	case BPF_FUNC_spin_lock:
		return &bpf_spin_lock_proto;
	case BPF_FUNC_spin_unlock:
		return &bpf_spin_unlock_proto;
	case BPF_FUNC_trace_printk:
		if (!perfmon_capable())
			return NULL;
		return bpf_get_trace_printk_proto();
	case BPF_FUNC_jiffies64:
		return &bpf_jiffies64_proto;
	default:
		break;
	}

	if (!perfmon_capable())
		return NULL;

	switch (func_id) {
	case BPF_FUNC_get_current_task:
		return &bpf_get_current_task_proto;
	case BPF_FUNC_probe_read_user:
		return &bpf_probe_read_user_proto;
	case BPF_FUNC_probe_read_kernel:
		return &bpf_probe_read_kernel_proto;
	case BPF_FUNC_probe_read_user_str:
		return &bpf_probe_read_user_str_proto;
	case BPF_FUNC_probe_read_kernel_str:
		return &bpf_probe_read_kernel_str_proto;
	default:
		return NULL;
	}
}
Commit	Line	Data
5b497af4	1	// SPDX-License-Identifier: GPL-2.0-only
d0003ec0	2	/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
d0003ec0 AS	3	*/
	4	#include <linux/bpf.h>
	5	#include <linux/rcupdate.h>
03e69b50	6	#include <linux/random.h>
c04167ce	7	#include <linux/smp.h>
2d0e30c3	8	#include <linux/topology.h>
17ca8cbf	9	#include <linux/ktime.h>
ffeedafb AS	10	#include <linux/sched.h>
ffeedafb AS	11	#include <linux/uidgid.h>
f3694e00	12	#include <linux/filter.h>
d7a4cb9b	13	#include <linux/ctype.h>
5576b991	14	#include <linux/jiffies.h>
b4490c5c CN	15	#include <linux/pid_namespace.h>
b4490c5c CN	16	#include <linux/proc_ns.h>
d7a4cb9b AI	17
d7a4cb9b AI	18	#include "../../lib/kstrtox.h"
d0003ec0 AS	19
	20	/* If kernel subsystem is allowing eBPF programs to call this function,
	21	* inside its own verifier_ops->get_func_proto() callback it should return
	22	* bpf_map_lookup_elem_proto, so that verifier can properly check the arguments
	23	*
	24	* Different map implementations will rely on rcu in map methods
	25	* lookup/update/delete, therefore eBPF programs must run under rcu lock
	26	* if program is allowed to access maps, so check rcu_read_lock_held in
	27	* all three functions.
	28	*/
f3694e00	29	BPF_CALL_2(bpf_map_lookup_elem, struct bpf_map , map, void , key)
d0003ec0	30	{
d0003ec0	31	WARN_ON_ONCE(!rcu_read_lock_held());
f3694e00	32	return (unsigned long) map->ops->map_lookup_elem(map, key);
d0003ec0 AS	33	}
d0003ec0 AS	34
a2c83fff	35	const struct bpf_func_proto bpf_map_lookup_elem_proto = {
3324b584 DB	36	.func = bpf_map_lookup_elem,
3324b584 DB	37	.gpl_only = false,
36bbef52	38	.pkt_access = true,
3324b584 DB	39	.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
	40	.arg1_type = ARG_CONST_MAP_PTR,
	41	.arg2_type = ARG_PTR_TO_MAP_KEY,
d0003ec0 AS	42	};
d0003ec0 AS	43
f3694e00 DB	44	BPF_CALL_4(bpf_map_update_elem, struct bpf_map , map, void , key,
f3694e00 DB	45	void *, value, u64, flags)
d0003ec0	46	{
d0003ec0	47	WARN_ON_ONCE(!rcu_read_lock_held());
f3694e00	48	return map->ops->map_update_elem(map, key, value, flags);
d0003ec0 AS	49	}
d0003ec0 AS	50
a2c83fff	51	const struct bpf_func_proto bpf_map_update_elem_proto = {
3324b584 DB	52	.func = bpf_map_update_elem,
3324b584 DB	53	.gpl_only = false,
36bbef52	54	.pkt_access = true,
3324b584 DB	55	.ret_type = RET_INTEGER,
	56	.arg1_type = ARG_CONST_MAP_PTR,
	57	.arg2_type = ARG_PTR_TO_MAP_KEY,
	58	.arg3_type = ARG_PTR_TO_MAP_VALUE,
	59	.arg4_type = ARG_ANYTHING,
d0003ec0 AS	60	};
d0003ec0 AS	61
f3694e00	62	BPF_CALL_2(bpf_map_delete_elem, struct bpf_map , map, void , key)
d0003ec0	63	{
d0003ec0	64	WARN_ON_ONCE(!rcu_read_lock_held());
d0003ec0 AS	65	return map->ops->map_delete_elem(map, key);
	66	}
	67
a2c83fff	68	const struct bpf_func_proto bpf_map_delete_elem_proto = {
3324b584 DB	69	.func = bpf_map_delete_elem,
3324b584 DB	70	.gpl_only = false,
36bbef52	71	.pkt_access = true,
3324b584 DB	72	.ret_type = RET_INTEGER,
	73	.arg1_type = ARG_CONST_MAP_PTR,
	74	.arg2_type = ARG_PTR_TO_MAP_KEY,
d0003ec0	75	};
03e69b50	76
f1a2e44a MV	77	BPF_CALL_3(bpf_map_push_elem, struct bpf_map , map, void , value, u64, flags)
	78	{
	79	return map->ops->map_push_elem(map, value, flags);
	80	}
	81
	82	const struct bpf_func_proto bpf_map_push_elem_proto = {
	83	.func = bpf_map_push_elem,
	84	.gpl_only = false,
	85	.pkt_access = true,
	86	.ret_type = RET_INTEGER,
	87	.arg1_type = ARG_CONST_MAP_PTR,
	88	.arg2_type = ARG_PTR_TO_MAP_VALUE,
	89	.arg3_type = ARG_ANYTHING,
	90	};
	91
	92	BPF_CALL_2(bpf_map_pop_elem, struct bpf_map , map, void , value)
	93	{
	94	return map->ops->map_pop_elem(map, value);
	95	}
	96
	97	const struct bpf_func_proto bpf_map_pop_elem_proto = {
	98	.func = bpf_map_pop_elem,
	99	.gpl_only = false,
f1a2e44a MV	100	.ret_type = RET_INTEGER,
	101	.arg1_type = ARG_CONST_MAP_PTR,
	102	.arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE,
	103	};
	104
	105	BPF_CALL_2(bpf_map_peek_elem, struct bpf_map , map, void , value)
	106	{
	107	return map->ops->map_peek_elem(map, value);
	108	}
	109
	110	const struct bpf_func_proto bpf_map_peek_elem_proto = {
	111	.func = bpf_map_pop_elem,
	112	.gpl_only = false,
f1a2e44a MV	113	.ret_type = RET_INTEGER,
	114	.arg1_type = ARG_CONST_MAP_PTR,
	115	.arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE,
	116	};
	117
03e69b50	118	const struct bpf_func_proto bpf_get_prandom_u32_proto = {
3ad00405	119	.func = bpf_user_rnd_u32,
03e69b50 DB	120	.gpl_only = false,
	121	.ret_type = RET_INTEGER,
	122	};
c04167ce	123
f3694e00	124	BPF_CALL_0(bpf_get_smp_processor_id)
c04167ce	125	{
80b48c44	126	return smp_processor_id();
c04167ce DB	127	}
	128
	129	const struct bpf_func_proto bpf_get_smp_processor_id_proto = {
	130	.func = bpf_get_smp_processor_id,
	131	.gpl_only = false,
	132	.ret_type = RET_INTEGER,
	133	};
17ca8cbf	134
2d0e30c3 DB	135	BPF_CALL_0(bpf_get_numa_node_id)
	136	{
	137	return numa_node_id();
	138	}
	139
	140	const struct bpf_func_proto bpf_get_numa_node_id_proto = {
	141	.func = bpf_get_numa_node_id,
	142	.gpl_only = false,
	143	.ret_type = RET_INTEGER,
	144	};
	145
f3694e00	146	BPF_CALL_0(bpf_ktime_get_ns)
17ca8cbf DB	147	{
	148	/* NMI safe access to clock monotonic */
	149	return ktime_get_mono_fast_ns();
	150	}
	151
	152	const struct bpf_func_proto bpf_ktime_get_ns_proto = {
	153	.func = bpf_ktime_get_ns,
082b57e3	154	.gpl_only = false,
17ca8cbf DB	155	.ret_type = RET_INTEGER,
17ca8cbf DB	156	};
ffeedafb	157
71d19214 MŻ	158	BPF_CALL_0(bpf_ktime_get_boot_ns)
	159	{
	160	/* NMI safe access to clock boottime */
	161	return ktime_get_boot_fast_ns();
	162	}
	163
	164	const struct bpf_func_proto bpf_ktime_get_boot_ns_proto = {
	165	.func = bpf_ktime_get_boot_ns,
	166	.gpl_only = false,
	167	.ret_type = RET_INTEGER,
	168	};
	169
f3694e00	170	BPF_CALL_0(bpf_get_current_pid_tgid)
ffeedafb AS	171	{
	172	struct task_struct *task = current;
	173
6088b582	174	if (unlikely(!task))
ffeedafb AS	175	return -EINVAL;
	176
	177	return (u64) task->tgid << 32 \| task->pid;
	178	}
	179
	180	const struct bpf_func_proto bpf_get_current_pid_tgid_proto = {
	181	.func = bpf_get_current_pid_tgid,
	182	.gpl_only = false,
	183	.ret_type = RET_INTEGER,
	184	};
	185
f3694e00	186	BPF_CALL_0(bpf_get_current_uid_gid)
ffeedafb AS	187	{
	188	struct task_struct *task = current;
	189	kuid_t uid;
	190	kgid_t gid;
	191
6088b582	192	if (unlikely(!task))
ffeedafb AS	193	return -EINVAL;
	194
	195	current_uid_gid(&uid, &gid);
	196	return (u64) from_kgid(&init_user_ns, gid) << 32 \|
6088b582	197	from_kuid(&init_user_ns, uid);
ffeedafb AS	198	}
	199
	200	const struct bpf_func_proto bpf_get_current_uid_gid_proto = {
	201	.func = bpf_get_current_uid_gid,
	202	.gpl_only = false,
	203	.ret_type = RET_INTEGER,
	204	};
	205
f3694e00	206	BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size)
ffeedafb AS	207	{
ffeedafb AS	208	struct task_struct *task = current;
ffeedafb	209
074f528e DB	210	if (unlikely(!task))
074f528e DB	211	goto err_clear;
ffeedafb	212
074f528e DB	213	strncpy(buf, task->comm, size);
	214
	215	/* Verifier guarantees that size > 0. For task->comm exceeding
	216	* size, guarantee that buf is %NUL-terminated. Unconditionally
	217	* done here to save the size test.
	218	*/
	219	buf[size - 1] = 0;
ffeedafb	220	return 0;
074f528e DB	221	err_clear:
	222	memset(buf, 0, size);
	223	return -EINVAL;
ffeedafb AS	224	}
	225
	226	const struct bpf_func_proto bpf_get_current_comm_proto = {
	227	.func = bpf_get_current_comm,
	228	.gpl_only = false,
	229	.ret_type = RET_INTEGER,
39f19ebb AS	230	.arg1_type = ARG_PTR_TO_UNINIT_MEM,
39f19ebb AS	231	.arg2_type = ARG_CONST_SIZE,
ffeedafb	232	};
bf6fa2c8	233
d83525ca AS	234	#if defined(CONFIG_QUEUED_SPINLOCKS) \|\| defined(CONFIG_BPF_ARCH_SPINLOCK)
	235
	236	static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
	237	{
	238	arch_spinlock_t l = (void )lock;
	239	union {
	240	__u32 val;
	241	arch_spinlock_t lock;
	242	} u = { .lock = __ARCH_SPIN_LOCK_UNLOCKED };
	243
	244	compiletime_assert(u.val == 0, "__ARCH_SPIN_LOCK_UNLOCKED not 0");
	245	BUILD_BUG_ON(sizeof(*l) != sizeof(__u32));
	246	BUILD_BUG_ON(sizeof(*lock) != sizeof(__u32));
	247	arch_spin_lock(l);
	248	}
	249
	250	static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
	251	{
	252	arch_spinlock_t l = (void )lock;
	253
	254	arch_spin_unlock(l);
	255	}
	256
	257	#else
	258
	259	static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
	260	{
	261	atomic_t l = (void )lock;
	262
	263	BUILD_BUG_ON(sizeof(l) != sizeof(lock));
	264	do {
	265	atomic_cond_read_relaxed(l, !VAL);
	266	} while (atomic_xchg(l, 1));
	267	}
	268
	269	static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
	270	{
	271	atomic_t l = (void )lock;
	272
	273	atomic_set_release(l, 0);
	274	}
	275
	276	#endif
	277
	278	static DEFINE_PER_CPU(unsigned long, irqsave_flags);
	279
	280	notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock)
	281	{
	282	unsigned long flags;
	283
	284	local_irq_save(flags);
	285	__bpf_spin_lock(lock);
	286	__this_cpu_write(irqsave_flags, flags);
	287	return 0;
	288	}
	289
	290	const struct bpf_func_proto bpf_spin_lock_proto = {
	291	.func = bpf_spin_lock,
	292	.gpl_only = false,
	293	.ret_type = RET_VOID,
	294	.arg1_type = ARG_PTR_TO_SPIN_LOCK,
	295	};
	296
	297	notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock)
298	{
299	unsigned long flags;
300
301	flags = __this_cpu_read(irqsave_flags);
302	__bpf_spin_unlock(lock);
303	local_irq_restore(flags);
304	return 0;
305	}
306
307	const struct bpf_func_proto bpf_spin_unlock_proto = {
308	.func = bpf_spin_unlock,
309	.gpl_only = false,
310	.ret_type = RET_VOID,
311	.arg1_type = ARG_PTR_TO_SPIN_LOCK,
312	};
313
96049f3a AS	314	void copy_map_value_locked(struct bpf_map map, void dst, void *src,
	315	bool lock_src)
	316	{
	317	struct bpf_spin_lock *lock;
	318
	319	if (lock_src)
	320	lock = src + map->spin_lock_off;
	321	else
	322	lock = dst + map->spin_lock_off;
	323	preempt_disable();
	324	____bpf_spin_lock(lock);
	325	copy_map_value(map, dst, src);
	326	____bpf_spin_unlock(lock);
	327	preempt_enable();
	328	}
	329
5576b991 MKL	330	BPF_CALL_0(bpf_jiffies64)
	331	{
	332	return get_jiffies_64();
	333	}
	334
	335	const struct bpf_func_proto bpf_jiffies64_proto = {
	336	.func = bpf_jiffies64,
	337	.gpl_only = false,
	338	.ret_type = RET_INTEGER,
	339	};
	340
bf6fa2c8 YS	341	#ifdef CONFIG_CGROUPS
	342	BPF_CALL_0(bpf_get_current_cgroup_id)
	343	{
	344	struct cgroup *cgrp = task_dfl_cgroup(current);
	345
74321038	346	return cgroup_id(cgrp);
bf6fa2c8 YS	347	}
	348
	349	const struct bpf_func_proto bpf_get_current_cgroup_id_proto = {
	350	.func = bpf_get_current_cgroup_id,
	351	.gpl_only = false,
	352	.ret_type = RET_INTEGER,
	353	};
cd339431	354
0f09abd1 DB	355	BPF_CALL_1(bpf_get_current_ancestor_cgroup_id, int, ancestor_level)
	356	{
	357	struct cgroup *cgrp = task_dfl_cgroup(current);
	358	struct cgroup *ancestor;
	359
	360	ancestor = cgroup_ancestor(cgrp, ancestor_level);
	361	if (!ancestor)
	362	return 0;
	363	return cgroup_id(ancestor);
	364	}
	365
	366	const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto = {
	367	.func = bpf_get_current_ancestor_cgroup_id,
	368	.gpl_only = false,
	369	.ret_type = RET_INTEGER,
	370	.arg1_type = ARG_ANYTHING,
	371	};
	372
8bad74f9	373	#ifdef CONFIG_CGROUP_BPF
f294b37e RG	374	DECLARE_PER_CPU(struct bpf_cgroup_storage*,
f294b37e RG	375	bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]);
cd339431 RG	376
	377	BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags)
	378	{
8bad74f9 RG	379	/* flags argument is not used now,
	380	* but provides an ability to extend the API.
	381	* verifier checks that its value is correct.
cd339431	382	*/
8bad74f9	383	enum bpf_cgroup_storage_type stype = cgroup_storage_type(map);
f294b37e	384	struct bpf_cgroup_storage *storage;
b741f163	385	void *ptr;
8bad74f9	386
f294b37e RG	387	storage = this_cpu_read(bpf_cgroup_storage[stype]);
f294b37e RG	388
b741f163 RG	389	if (stype == BPF_CGROUP_STORAGE_SHARED)
	390	ptr = &READ_ONCE(storage->buf)->data[0];
	391	else
	392	ptr = this_cpu_ptr(storage->percpu_buf);
	393
	394	return (unsigned long)ptr;
cd339431 RG	395	}
	396
	397	const struct bpf_func_proto bpf_get_local_storage_proto = {
	398	.func = bpf_get_local_storage,
	399	.gpl_only = false,
	400	.ret_type = RET_PTR_TO_MAP_VALUE,
	401	.arg1_type = ARG_CONST_MAP_PTR,
	402	.arg2_type = ARG_ANYTHING,
	403	};
bf6fa2c8	404	#endif
d7a4cb9b AI	405
	406	#define BPF_STRTOX_BASE_MASK 0x1F
	407
	408	static int __bpf_strtoull(const char *buf, size_t buf_len, u64 flags,
	409	unsigned long long res, bool is_negative)
	410	{
	411	unsigned int base = flags & BPF_STRTOX_BASE_MASK;
	412	const char *cur_buf = buf;
	413	size_t cur_len = buf_len;
	414	unsigned int consumed;
	415	size_t val_len;
	416	char str[64];
	417
	418	if (!buf \|\| !buf_len \|\| !res \|\| !is_negative)
	419	return -EINVAL;
	420
	421	if (base != 0 && base != 8 && base != 10 && base != 16)
	422	return -EINVAL;
	423
	424	if (flags & ~BPF_STRTOX_BASE_MASK)
	425	return -EINVAL;
	426
	427	while (cur_buf < buf + buf_len && isspace(*cur_buf))
	428	++cur_buf;
	429
	430	is_negative = (cur_buf < buf + buf_len && cur_buf == '-');
	431	if (*is_negative)
	432	++cur_buf;
	433
	434	consumed = cur_buf - buf;
	435	cur_len -= consumed;
	436	if (!cur_len)
	437	return -EINVAL;
	438
	439	cur_len = min(cur_len, sizeof(str) - 1);
	440	memcpy(str, cur_buf, cur_len);
	441	str[cur_len] = '\0';
	442	cur_buf = str;
	443
	444	cur_buf = _parse_integer_fixup_radix(cur_buf, &base);
	445	val_len = _parse_integer(cur_buf, base, res);
	446
	447	if (val_len & KSTRTOX_OVERFLOW)
	448	return -ERANGE;
	449
	450	if (val_len == 0)
	451	return -EINVAL;
	452
	453	cur_buf += val_len;
	454	consumed += cur_buf - str;
	455
	456	return consumed;
	457	}
	458
	459	static int __bpf_strtoll(const char *buf, size_t buf_len, u64 flags,
	460	long long *res)
	461	{
	462	unsigned long long _res;
	463	bool is_negative;
	464	int err;
	465
	466	err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
	467	if (err < 0)
	468	return err;
469	if (is_negative) {
470	if ((long long)-_res > 0)
471	return -ERANGE;
472	*res = -_res;
473	} else {
474	if ((long long)_res < 0)
475	return -ERANGE;
476	*res = _res;
477	}
478	return err;
479	}
480
481	BPF_CALL_4(bpf_strtol, const char *, buf, size_t, buf_len, u64, flags,
482	long *, res)
483	{
484	long long _res;
485	int err;
486
487	err = __bpf_strtoll(buf, buf_len, flags, &_res);
488	if (err < 0)
489	return err;
490	if (_res != (long)_res)
491	return -ERANGE;
492	*res = _res;
493	return err;
494	}
495
496	const struct bpf_func_proto bpf_strtol_proto = {
497	.func = bpf_strtol,
498	.gpl_only = false,
499	.ret_type = RET_INTEGER,
500	.arg1_type = ARG_PTR_TO_MEM,
501	.arg2_type = ARG_CONST_SIZE,
502	.arg3_type = ARG_ANYTHING,
503	.arg4_type = ARG_PTR_TO_LONG,
504	};
505
506	BPF_CALL_4(bpf_strtoul, const char *, buf, size_t, buf_len, u64, flags,
507	unsigned long *, res)
508	{
509	unsigned long long _res;
510	bool is_negative;
511	int err;
512
513	err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
514	if (err < 0)
515	return err;
516	if (is_negative)
517	return -EINVAL;
518	if (_res != (unsigned long)_res)
519	return -ERANGE;
520	*res = _res;
521	return err;
522	}
523
524	const struct bpf_func_proto bpf_strtoul_proto = {
525	.func = bpf_strtoul,
526	.gpl_only = false,
527	.ret_type = RET_INTEGER,
528	.arg1_type = ARG_PTR_TO_MEM,
529	.arg2_type = ARG_CONST_SIZE,
530	.arg3_type = ARG_ANYTHING,
531	.arg4_type = ARG_PTR_TO_LONG,
532	};
8bad74f9	533	#endif
b4490c5c CN	534
	535	BPF_CALL_4(bpf_get_ns_current_pid_tgid, u64, dev, u64, ino,
	536	struct bpf_pidns_info *, nsdata, u32, size)
	537	{
	538	struct task_struct *task = current;
	539	struct pid_namespace *pidns;
	540	int err = -EINVAL;
	541
	542	if (unlikely(size != sizeof(struct bpf_pidns_info)))
	543	goto clear;
	544
	545	if (unlikely((u64)(dev_t)dev != dev))
	546	goto clear;
	547
	548	if (unlikely(!task))
	549	goto clear;
	550
	551	pidns = task_active_pid_ns(task);
	552	if (unlikely(!pidns)) {
	553	err = -ENOENT;
	554	goto clear;
	555	}
	556
	557	if (!ns_match(&pidns->ns, (dev_t)dev, ino))
	558	goto clear;
	559
	560	nsdata->pid = task_pid_nr_ns(task, pidns);
	561	nsdata->tgid = task_tgid_nr_ns(task, pidns);
	562	return 0;
	563	clear:
	564	memset((void *)nsdata, 0, (size_t) size);
	565	return err;
	566	}
	567
	568	const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto = {
	569	.func = bpf_get_ns_current_pid_tgid,
	570	.gpl_only = false,
	571	.ret_type = RET_INTEGER,
	572	.arg1_type = ARG_ANYTHING,
	573	.arg2_type = ARG_ANYTHING,
	574	.arg3_type = ARG_PTR_TO_UNINIT_MEM,
	575	.arg4_type = ARG_CONST_SIZE,
	576	};
6890896b SF	577
	578	static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
	579	.func = bpf_get_raw_cpu_id,
	580	.gpl_only = false,
	581	.ret_type = RET_INTEGER,
	582	};
	583
	584	BPF_CALL_5(bpf_event_output_data, void , ctx, struct bpf_map , map,
	585	u64, flags, void *, data, u64, size)
	586	{
	587	if (unlikely(flags & ~(BPF_F_INDEX_MASK)))
	588	return -EINVAL;
	589
	590	return bpf_event_output(map, flags, data, size, NULL, 0, NULL);
	591	}
	592
	593	const struct bpf_func_proto bpf_event_output_data_proto = {
	594	.func = bpf_event_output_data,
	595	.gpl_only = true,
	596	.ret_type = RET_INTEGER,
	597	.arg1_type = ARG_PTR_TO_CTX,
	598	.arg2_type = ARG_CONST_MAP_PTR,
	599	.arg3_type = ARG_ANYTHING,
	600	.arg4_type = ARG_PTR_TO_MEM,
	601	.arg5_type = ARG_CONST_SIZE_OR_ZERO,
	602	};
	603
f470378c JF	604	const struct bpf_func_proto bpf_get_current_task_proto __weak;
	605	const struct bpf_func_proto bpf_probe_read_user_proto __weak;
	606	const struct bpf_func_proto bpf_probe_read_user_str_proto __weak;
	607	const struct bpf_func_proto bpf_probe_read_kernel_proto __weak;
	608	const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak;
	609
6890896b SF	610	const struct bpf_func_proto *
	611	bpf_base_func_proto(enum bpf_func_id func_id)
	612	{
	613	switch (func_id) {
	614	case BPF_FUNC_map_lookup_elem:
	615	return &bpf_map_lookup_elem_proto;
	616	case BPF_FUNC_map_update_elem:
	617	return &bpf_map_update_elem_proto;
	618	case BPF_FUNC_map_delete_elem:
	619	return &bpf_map_delete_elem_proto;
	620	case BPF_FUNC_map_push_elem:
	621	return &bpf_map_push_elem_proto;
	622	case BPF_FUNC_map_pop_elem:
	623	return &bpf_map_pop_elem_proto;
	624	case BPF_FUNC_map_peek_elem:
	625	return &bpf_map_peek_elem_proto;
	626	case BPF_FUNC_get_prandom_u32:
	627	return &bpf_get_prandom_u32_proto;
	628	case BPF_FUNC_get_smp_processor_id:
	629	return &bpf_get_raw_smp_processor_id_proto;
	630	case BPF_FUNC_get_numa_node_id:
	631	return &bpf_get_numa_node_id_proto;
	632	case BPF_FUNC_tail_call:
	633	return &bpf_tail_call_proto;
	634	case BPF_FUNC_ktime_get_ns:
	635	return &bpf_ktime_get_ns_proto;
71d19214 MŻ	636	case BPF_FUNC_ktime_get_boot_ns:
71d19214 MŻ	637	return &bpf_ktime_get_boot_ns_proto;
457f4436 AN	638	case BPF_FUNC_ringbuf_output:
	639	return &bpf_ringbuf_output_proto;
	640	case BPF_FUNC_ringbuf_reserve:
	641	return &bpf_ringbuf_reserve_proto;
	642	case BPF_FUNC_ringbuf_submit:
	643	return &bpf_ringbuf_submit_proto;
	644	case BPF_FUNC_ringbuf_discard:
	645	return &bpf_ringbuf_discard_proto;
	646	case BPF_FUNC_ringbuf_query:
	647	return &bpf_ringbuf_query_proto;
6890896b SF	648	default:
	649	break;
	650	}
	651
2c78ee89	652	if (!bpf_capable())
6890896b SF	653	return NULL;
	654
	655	switch (func_id) {
	656	case BPF_FUNC_spin_lock:
	657	return &bpf_spin_lock_proto;
	658	case BPF_FUNC_spin_unlock:
	659	return &bpf_spin_unlock_proto;
	660	case BPF_FUNC_trace_printk:
2c78ee89 AS	661	if (!perfmon_capable())
2c78ee89 AS	662	return NULL;
6890896b SF	663	return bpf_get_trace_printk_proto();
	664	case BPF_FUNC_jiffies64:
	665	return &bpf_jiffies64_proto;
f470378c JF	666	default:
	667	break;
	668	}
	669
	670	if (!perfmon_capable())
	671	return NULL;
	672
	673	switch (func_id) {
	674	case BPF_FUNC_get_current_task:
	675	return &bpf_get_current_task_proto;
	676	case BPF_FUNC_probe_read_user:
	677	return &bpf_probe_read_user_proto;
	678	case BPF_FUNC_probe_read_kernel:
	679	return &bpf_probe_read_kernel_proto;
	680	case BPF_FUNC_probe_read_user_str:
	681	return &bpf_probe_read_user_str_proto;
	682	case BPF_FUNC_probe_read_kernel_str:
	683	return &bpf_probe_read_kernel_str_proto;
6890896b SF	684	default:
	685	return NULL;
	686	}
	687	}