#ifndef __BPF_EXPERIMENTAL__
#define __BPF_EXPERIMENTAL__
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h>
#define __contains(name, node) __attribute__((btf_decl_tag("contains:" #name ":" #node)))
/* Description
* Allocates an object of the type represented by 'local_type_id' in
* program BTF. User may use the bpf_core_type_id_local macro to pass the
* type ID of a struct in program BTF.
*
* The 'local_type_id' parameter must be a known constant.
* The 'meta' parameter is rewritten by the verifier, no need for BPF
* program to set it.
* Returns
* A pointer to an object of the type corresponding to the passed in
* 'local_type_id', or NULL on failure.
*/
extern void *bpf_obj_new_impl(__u64 local_type_id, void *meta) __ksym;
/* Convenience macro to wrap over bpf_obj_new_impl */
#define bpf_obj_new(type) ((type *)bpf_obj_new_impl(bpf_core_type_id_local(type), NULL))
/* Description
* Free an allocated object. All fields of the object that require
* destruction will be destructed before the storage is freed.
*
* The 'meta' parameter is rewritten by the verifier, no need for BPF
* program to set it.
* Returns
* Void.
*/
extern void bpf_obj_drop_impl(void *kptr, void *meta) __ksym;
/* Convenience macro to wrap over bpf_obj_drop_impl */
#define bpf_obj_drop(kptr) bpf_obj_drop_impl(kptr, NULL)
/* Description
* Increment the refcount on a refcounted local kptr, turning the
* non-owning reference input into an owning reference in the process.
*
* The 'meta' parameter is rewritten by the verifier, no need for BPF
* program to set it.
* Returns
* An owning reference to the object pointed to by 'kptr'
*/
extern void *bpf_refcount_acquire_impl(void *kptr, void *meta) __ksym;
/* Convenience macro to wrap over bpf_refcount_acquire_impl */
#define bpf_refcount_acquire(kptr) bpf_refcount_acquire_impl(kptr, NULL)
/* Description
* Add a new entry to the beginning of the BPF linked list.
*
* The 'meta' and 'off' parameters are rewritten by the verifier, no need
* for BPF programs to set them
* Returns
* 0 if the node was successfully added
* -EINVAL if the node wasn't added because it's already in a list
*/
extern int bpf_list_push_front_impl(struct bpf_list_head *head,
struct bpf_list_node *node,
void *meta, __u64 off) __ksym;
/* Convenience macro to wrap over bpf_list_push_front_impl */
#define bpf_list_push_front(head, node) bpf_list_push_front_impl(head, node, NULL, 0)
/* Description
* Add a new entry to the end of the BPF linked list.
*
* The 'meta' and 'off' parameters are rewritten by the verifier, no need
* for BPF programs to set them
* Returns
* 0 if the node was successfully added
* -EINVAL if the node wasn't added because it's already in a list
*/
extern int bpf_list_push_back_impl(struct bpf_list_head *head,
struct bpf_list_node *node,
void *meta, __u64 off) __ksym;
/* Convenience macro to wrap over bpf_list_push_back_impl */
#define bpf_list_push_back(head, node) bpf_list_push_back_impl(head, node, NULL, 0)
/* Description
* Remove the entry at the beginning of the BPF linked list.
* Returns
* Pointer to bpf_list_node of deleted entry, or NULL if list is empty.
*/
extern struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head) __ksym;
/* Description
* Remove the entry at the end of the BPF linked list.
* Returns
* Pointer to bpf_list_node of deleted entry, or NULL if list is empty.
*/
extern struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head) __ksym;
/* Description
* Remove 'node' from rbtree with root 'root'
* Returns
* Pointer to the removed node, or NULL if 'root' didn't contain 'node'
*/
extern struct bpf_rb_node *bpf_rbtree_remove(struct bpf_rb_root *root,
struct bpf_rb_node *node) __ksym;
/* Description
* Add 'node' to rbtree with root 'root' using comparator 'less'
*
* The 'meta' and 'off' parameters are rewritten by the verifier, no need
* for BPF programs to set them
* Returns
* 0 if the node was successfully added
* -EINVAL if the node wasn't added because it's already in a tree
*/
extern int bpf_rbtree_add_impl(struct bpf_rb_root *root, struct bpf_rb_node *node,
bool (less)(struct bpf_rb_node *a, const struct bpf_rb_node *b),
void *meta, __u64 off) __ksym;
/* Convenience macro to wrap over bpf_rbtree_add_impl */
#define bpf_rbtree_add(head, node, less) bpf_rbtree_add_impl(head, node, less, NULL, 0)
/* Description
* Return the first (leftmost) node in input tree
* Returns
* Pointer to the node, which is _not_ removed from the tree. If the tree
* contains no nodes, returns NULL.
*/
extern struct bpf_rb_node *bpf_rbtree_first(struct bpf_rb_root *root) __ksym;
/* Description
* Allocates a percpu object of the type represented by 'local_type_id' in
* program BTF. User may use the bpf_core_type_id_local macro to pass the
* type ID of a struct in program BTF.
*
* The 'local_type_id' parameter must be a known constant.
* The 'meta' parameter is rewritten by the verifier, no need for BPF
* program to set it.
* Returns
* A pointer to a percpu object of the type corresponding to the passed in
* 'local_type_id', or NULL on failure.
*/
extern void *bpf_percpu_obj_new_impl(__u64 local_type_id, void *meta) __ksym;
/* Convenience macro to wrap over bpf_percpu_obj_new_impl */
#define bpf_percpu_obj_new(type) ((type __percpu_kptr *)bpf_percpu_obj_new_impl(bpf_core_type_id_local(type), NULL))
/* Description
* Free an allocated percpu object. All fields of the object that require
* destruction will be destructed before the storage is freed.
*
* The 'meta' parameter is rewritten by the verifier, no need for BPF
* program to set it.
* Returns
* Void.
*/
extern void bpf_percpu_obj_drop_impl(void *kptr, void *meta) __ksym;
struct bpf_iter_task_vma;
extern int bpf_iter_task_vma_new(struct bpf_iter_task_vma *it,
struct task_struct *task,
__u64 addr) __ksym;
extern struct vm_area_struct *bpf_iter_task_vma_next(struct bpf_iter_task_vma *it) __ksym;
extern void bpf_iter_task_vma_destroy(struct bpf_iter_task_vma *it) __ksym;
/* Convenience macro to wrap over bpf_obj_drop_impl */
#define bpf_percpu_obj_drop(kptr) bpf_percpu_obj_drop_impl(kptr, NULL)
/* Description
* Throw a BPF exception from the program, immediately terminating its
* execution and unwinding the stack. The supplied 'cookie' parameter
* will be the return value of the program when an exception is thrown,
* and the default exception callback is used. Otherwise, if an exception
* callback is set using the '__exception_cb(callback)' declaration tag
* on the main program, the 'cookie' parameter will be the callback's only
* input argument.
*
* Thus, in case of default exception callback, 'cookie' is subjected to
* constraints on the program's return value (as with R0 on exit).
* Otherwise, the return value of the marked exception callback will be
* subjected to the same checks.
*
* Note that throwing an exception with lingering resources (locks,
* references, etc.) will lead to a verification error.
*
* Note that callbacks *cannot* call this helper.
* Returns
* Never.
* Throws
* An exception with the specified 'cookie' value.
*/
extern void bpf_throw(u64 cookie) __ksym;
/* Description
* Acquire a reference on the exe_file member field belonging to the
* mm_struct that is nested within the supplied task_struct. The supplied
* task_struct must be trusted/referenced.
* Returns
* A referenced file pointer pointing to the exe_file member field of the
* mm_struct nested in the supplied task_struct, or NULL.
*/
extern struct file *bpf_get_task_exe_file(struct task_struct *task) __ksym;
/* Description
* Release a reference on the supplied file. The supplied file must be
* acquired.
*/
extern void bpf_put_file(struct file *file) __ksym;
/* Description
* Resolve a pathname for the supplied path and store it in the supplied
* buffer. The supplied path must be trusted/referenced.
* Returns
* A positive integer corresponding to the length of the resolved pathname,
* including the NULL termination character, stored in the supplied
* buffer. On error, a negative integer is returned.
*/
extern int bpf_path_d_path(struct path *path, char *buf, size_t buf__sz) __ksym;
/* This macro must be used to mark the exception callback corresponding to the
* main program. For example:
*
* int exception_cb(u64 cookie) {
* return cookie;
* }
*
* SEC("tc")
* __exception_cb(exception_cb)
* int main_prog(struct __sk_buff *ctx) {
* ...
* return TC_ACT_OK;
* }
*
* Here, exception callback for the main program will be 'exception_cb'. Note
* that this attribute can only be used once, and multiple exception callbacks
* specified for the main program will lead to verification error.
*/
#define __exception_cb(name) __attribute__((btf_decl_tag("exception_callback:" #name)))
#define __bpf_assert_signed(x) _Generic((x), \
unsigned long: 0, \
unsigned long long: 0, \
signed long: 1, \
signed long long: 1 \
)
#define __bpf_assert_check(LHS, op, RHS) \
_Static_assert(sizeof(&(LHS)), "1st argument must be an lvalue expression"); \
_Static_assert(sizeof(LHS) == 8, "Only 8-byte integers are supported\n"); \
_Static_assert(__builtin_constant_p(__bpf_assert_signed(LHS)), "internal static assert"); \
_Static_assert(__builtin_constant_p((RHS)), "2nd argument must be a constant expression")
#define __bpf_assert(LHS, op, cons, RHS, VAL) \
({ \
(void)bpf_throw; \
asm volatile ("if %[lhs] " op " %[rhs] goto +2; r1 = %[value]; call bpf_throw" \
: : [lhs] "r"(LHS), [rhs] cons(RHS), [value] "ri"(VAL) : ); \
})
#define __bpf_assert_op_sign(LHS, op, cons, RHS, VAL, supp_sign) \
({ \
__bpf_assert_check(LHS, op, RHS); \
if (__bpf_assert_signed(LHS) && !(supp_sign)) \
__bpf_assert(LHS, "s" #op, cons, RHS, VAL); \
else \
__bpf_assert(LHS, #op, cons, RHS, VAL); \
})
#define __bpf_assert_op(LHS, op, RHS, VAL, supp_sign) \
({ \
if (sizeof(typeof(RHS)) == 8) { \
const typeof(RHS) rhs_var = (RHS); \
__bpf_assert_op_sign(LHS, op, "r", rhs_var, VAL, supp_sign); \
} else { \
__bpf_assert_op_sign(LHS, op, "i", RHS, VAL, supp_sign); \
} \
})
#define __cmp_cannot_be_signed(x) \
__builtin_strcmp(#x, "==") == 0 || __builtin_strcmp(#x, "!=") == 0 || \
__builtin_strcmp(#x, "&") == 0
#define __is_signed_type(type) (((type)(-1)) < (type)1)
#define __bpf_cmp(LHS, OP, PRED, RHS, DEFAULT) \
({ \
__label__ l_true; \
bool ret = DEFAULT; \
asm volatile goto("if %[lhs] " OP " %[rhs] goto %l[l_true]" \
:: [lhs] "r"((short)LHS), [rhs] PRED (RHS) :: l_true); \
ret = !DEFAULT; \
l_true: \
ret; \
})
/* C type conversions coupled with comparison operator are tricky.
* Make sure BPF program is compiled with -Wsign-compare then
* __lhs OP __rhs below will catch the mistake.
* Be aware that we check only __lhs to figure out the sign of compare.
*/
#define _bpf_cmp(LHS, OP, RHS, UNLIKELY) \
({ \
typeof(LHS) __lhs = (LHS); \
typeof(RHS) __rhs = (RHS); \
bool ret; \
_Static_assert(sizeof(&(LHS)), "1st argument must be an lvalue expression"); \
(void)(__lhs OP __rhs); \
if (__cmp_cannot_be_signed(OP) || !__is_signed_type(typeof(__lhs))) { \
if (sizeof(__rhs) == 8) \
/* "i" will truncate 64-bit constant into s32, \
* so we have to use extra register via "r". \
*/ \
ret = __bpf_cmp(__lhs, #OP, "r", __rhs, UNLIKELY); \
else \
ret = __bpf_cmp(__lhs, #OP, "ri", __rhs, UNLIKELY); \
} else { \
if (sizeof(__rhs) == 8) \
ret = __bpf_cmp(__lhs, "s"#OP, "r", __rhs, UNLIKELY); \
else \
ret = __bpf_cmp(__lhs, "s"#OP, "ri", __rhs, UNLIKELY); \
} \
ret; \
})
#ifndef bpf_cmp_unlikely
#define bpf_cmp_unlikely(LHS, OP, RHS) _bpf_cmp(LHS, OP, RHS, true)
#endif
#ifndef bpf_cmp_likely
#define bpf_cmp_likely(LHS, OP, RHS) \
({ \
bool ret = 0; \
if (__builtin_strcmp(#OP, "==") == 0) \
ret = _bpf_cmp(LHS, !=, RHS, false); \
else if (__builtin_strcmp(#OP, "!=") == 0) \
ret = _bpf_cmp(LHS, ==, RHS, false); \
else if (__builtin_strcmp(#OP, "<=") == 0) \
ret = _bpf_cmp(LHS, >, RHS, false); \
else if (__builtin_strcmp(#OP, "<") == 0) \
ret = _bpf_cmp(LHS, >=, RHS, false); \
else if (__builtin_strcmp(#OP, ">") == 0) \
ret = _bpf_cmp(LHS, <=, RHS, false); \
else if (__builtin_strcmp(#OP, ">=") == 0) \
ret = _bpf_cmp(LHS, <, RHS, false); \
else \
asm volatile("r0 " #OP " invalid compare"); \
ret; \
})
#endif
/*
* Note that cond_break can only be portably used in the body of a breakable
* construct, whereas can_loop can be used anywhere.
*/
#ifdef __BPF_FEATURE_MAY_GOTO
#define can_loop \
({ __label__ l_break, l_continue; \
bool ret = true; \
asm volatile goto("may_goto %l[l_break]" \
:::: l_break); \
goto l_continue; \
l_break: ret = false; \
l_continue:; \
ret; \
})
#define cond_break \
({ __label__ l_break, l_continue; \
asm volatile goto("may_goto %l[l_break]" \
:::: l_break); \
goto l_continue; \
l_break: break; \
l_continue:; \
})
#else
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define can_loop \
({ __label__ l_break, l_continue; \
bool ret = true; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long ((%l[l_break] - 1b - 8) / 8) & 0xffff; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: ret = false; \
l_continue:; \
ret; \
})
#define cond_break \
({ __label__ l_break, l_continue; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long ((%l[l_break] - 1b - 8) / 8) & 0xffff; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: break; \
l_continue:; \
})
#else
#define can_loop \
({ __label__ l_break, l_continue; \
bool ret = true; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long (((%l[l_break] - 1b - 8) / 8) & 0xffff) << 16; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: ret = false; \
l_continue:; \
ret; \
})
#define cond_break \
({ __label__ l_break, l_continue; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long (((%l[l_break] - 1b - 8) / 8) & 0xffff) << 16; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: break; \
l_continue:; \
})
#endif
#endif
#ifndef bpf_nop_mov
#define bpf_nop_mov(var) \
asm volatile("%[reg]=%[reg]"::[reg]"r"((short)var))
#endif
/* emit instruction:
* rX = rX .off = BPF_ADDR_SPACE_CAST .imm32 = (dst_as << 16) | src_as
*/
#ifndef bpf_addr_space_cast
#define bpf_addr_space_cast(var, dst_as, src_as)\
asm volatile(".byte 0xBF; \
.ifc %[reg], r0; \
.byte 0x00; \
.endif; \
.ifc %[reg], r1; \
.byte 0x11; \
.endif; \
.ifc %[reg], r2; \
.byte 0x22; \
.endif; \
.ifc %[reg], r3; \
.byte 0x33; \
.endif; \
.ifc %[reg], r4; \
.byte 0x44; \
.endif; \
.ifc %[reg], r5; \
.byte 0x55; \
.endif; \
.ifc %[reg], r6; \
.byte 0x66; \
.endif; \
.ifc %[reg], r7; \
.byte 0x77; \
.endif; \
.ifc %[reg], r8; \
.byte 0x88; \
.endif; \
.ifc %[reg], r9; \
.byte 0x99; \
.endif; \
.short %[off]; \
.long %[as]" \
: [reg]"+r"(var) \
: [off]"i"(BPF_ADDR_SPACE_CAST) \
, [as]"i"((dst_as << 16) | src_as));
#endif
void bpf_preempt_disable(void) __weak __ksym;
void bpf_preempt_enable(void) __weak __ksym;
typedef struct {
} __bpf_preempt_t;
static inline __bpf_preempt_t __bpf_preempt_constructor(void)
{
__bpf_preempt_t ret = {};
bpf_preempt_disable();
return ret;
}
static inline void __bpf_preempt_destructor(__bpf_preempt_t *t)
{
bpf_preempt_enable();
}
#define bpf_guard_preempt() \
__bpf_preempt_t ___bpf_apply(preempt, __COUNTER__) \
__attribute__((__unused__, __cleanup__(__bpf_preempt_destructor))) = \
__bpf_preempt_constructor()
/* Description
* Assert that a conditional expression is true.
* Returns
* Void.
* Throws
* An exception with the value zero when the assertion fails.
*/
#define bpf_assert(cond) if (!(cond)) bpf_throw(0);
/* Description
* Assert that a conditional expression is true.
* Returns
* Void.
* Throws
* An exception with the specified value when the assertion fails.
*/
#define bpf_assert_with(cond, value) if (!(cond)) bpf_throw(value);
/* Description
* Assert that LHS is in the range [BEG, END] (inclusive of both). This
* statement updates the known bounds of LHS during verification. Note
* that both BEG and END must be constant values, and must fit within the
* data type of LHS.
* Returns
* Void.
* Throws
* An exception with the value zero when the assertion fails.
*/
#define bpf_assert_range(LHS, BEG, END) \
({ \
_Static_assert(BEG <= END, "BEG must be <= END"); \
barrier_var(LHS); \
__bpf_assert_op(LHS, >=, BEG, 0, false); \
__bpf_assert_op(LHS, <=, END, 0, false); \
})
/* Description
* Assert that LHS is in the range [BEG, END] (inclusive of both). This
* statement updates the known bounds of LHS during verification. Note
* that both BEG and END must be constant values, and must fit within the
* data type of LHS.
* Returns
* Void.
* Throws
* An exception with the specified value when the assertion fails.
*/
#define bpf_assert_range_with(LHS, BEG, END, value) \
({ \
_Static_assert(BEG <= END, "BEG must be <= END"); \
barrier_var(LHS); \
__bpf_assert_op(LHS, >=, BEG, value, false); \
__bpf_assert_op(LHS, <=, END, value, false); \
})
struct bpf_iter_css_task;
struct cgroup_subsys_state;
extern int bpf_iter_css_task_new(struct bpf_iter_css_task *it,
struct cgroup_subsys_state *css, unsigned int flags) __weak __ksym;
extern struct task_struct *bpf_iter_css_task_next(struct bpf_iter_css_task *it) __weak __ksym;
extern void bpf_iter_css_task_destroy(struct bpf_iter_css_task *it) __weak __ksym;
struct bpf_iter_task;
extern int bpf_iter_task_new(struct bpf_iter_task *it,
struct task_struct *task, unsigned int flags) __weak __ksym;
extern struct task_struct *bpf_iter_task_next(struct bpf_iter_task *it) __weak __ksym;
extern void bpf_iter_task_destroy(struct bpf_iter_task *it) __weak __ksym;
struct bpf_iter_css;
extern int bpf_iter_css_new(struct bpf_iter_css *it,
struct cgroup_subsys_state *start, unsigned int flags) __weak __ksym;
extern struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it) __weak __ksym;
extern void bpf_iter_css_destroy(struct bpf_iter_css *it) __weak __ksym;
extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym;
extern int bpf_wq_start(struct bpf_wq *wq, unsigned int flags) __weak __ksym;
extern int bpf_wq_set_callback_impl(struct bpf_wq *wq,
int (callback_fn)(void *map, int *key, void *value),
unsigned int flags__k, void *aux__ign) __ksym;
#define bpf_wq_set_callback(timer, cb, flags) \
bpf_wq_set_callback_impl(timer, cb, flags, NULL)
#endif
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