cregit-Linux how code gets into the kernel

Release 4.15 include/linux/bpf.h

Directory: include/linux
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#ifndef _LINUX_BPF_H

#define _LINUX_BPF_H 1

#include <uapi/linux/bpf.h>

#include <linux/workqueue.h>
#include <linux/file.h>
#include <linux/percpu.h>
#include <linux/err.h>
#include <linux/rbtree_latch.h>
#include <linux/numa.h>
#include <linux/wait.h>

struct perf_event;
struct bpf_prog;
struct bpf_map;

/* map is generic key/value storage optionally accesible by eBPF programs */

struct bpf_map_ops {
	/* funcs callable from userspace (via syscall) */
	
struct bpf_map *(*map_alloc)(union bpf_attr *attr);
	
void (*map_release)(struct bpf_map *map, struct file *map_file);
	
void (*map_free)(struct bpf_map *map);
	
int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);

	/* funcs callable from userspace and from eBPF programs */
	
void *(*map_lookup_elem)(struct bpf_map *map, void *key);
	
int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
	
int (*map_delete_elem)(struct bpf_map *map, void *key);

	/* funcs called by prog_array and perf_event_array map */
	
void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
				int fd);
	
void (*map_fd_put_ptr)(void *ptr);
	
u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
	
u32 (*map_fd_sys_lookup_elem)(void *ptr);
};


struct bpf_map {
	/* 1st cacheline with read-mostly members of which some
         * are also accessed in fast-path (e.g. ops, max_entries).
         */
	
const struct bpf_map_ops *ops ____cacheline_aligned;
	
struct bpf_map *inner_map_meta;
#ifdef CONFIG_SECURITY
	
void *security;
#endif
	
enum bpf_map_type map_type;
	
u32 key_size;
	
u32 value_size;
	
u32 max_entries;
	
u32 map_flags;
	
u32 pages;
	
u32 id;
	
int numa_node;
	
bool unpriv_array;
	/* 7 bytes hole */

	/* 2nd cacheline with misc members to avoid false sharing
         * particularly with refcounting.
         */
	
struct user_struct *user ____cacheline_aligned;
	
atomic_t refcnt;
	
atomic_t usercnt;
	
struct work_struct work;
	
char name[BPF_OBJ_NAME_LEN];
};

/* function argument constraints */

enum bpf_arg_type {
	
ARG_DONTCARE = 0,	/* unused argument in helper function */

	/* the following constraints used to prototype
         * bpf_map_lookup/update/delete_elem() functions
         */
	
ARG_CONST_MAP_PTR,	/* const argument used as pointer to bpf_map */
	
ARG_PTR_TO_MAP_KEY,	/* pointer to stack used as map key */
	
ARG_PTR_TO_MAP_VALUE,	/* pointer to stack used as map value */

	/* the following constraints used to prototype bpf_memcmp() and other
         * functions that access data on eBPF program stack
         */
	
ARG_PTR_TO_MEM,		/* pointer to valid memory (stack, packet, map value) */
	
ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
	
ARG_PTR_TO_UNINIT_MEM,	/* pointer to memory does not need to be initialized,
                                 * helper function must fill all bytes or clear
                                 * them in error case.
                                 */

	
ARG_CONST_SIZE,		/* number of bytes accessed from memory */
	
ARG_CONST_SIZE_OR_ZERO,	/* number of bytes accessed from memory or 0 */

	
ARG_PTR_TO_CTX,		/* pointer to context */
	
ARG_ANYTHING,		/* any (initialized) argument is ok */
};

/* type of values returned from helper functions */

enum bpf_return_type {
	
RET_INTEGER,			/* function returns integer */
	
RET_VOID,			/* function doesn't return anything */
	
RET_PTR_TO_MAP_VALUE_OR_NULL,	/* returns a pointer to map elem value or NULL */
};

/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 * instructions after verifying
 */

struct bpf_func_proto {
	
u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
	
bool gpl_only;
	
bool pkt_access;
	
enum bpf_return_type ret_type;
	
enum bpf_arg_type arg1_type;
	
enum bpf_arg_type arg2_type;
	
enum bpf_arg_type arg3_type;
	
enum bpf_arg_type arg4_type;
	
enum bpf_arg_type arg5_type;
};

/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 * the first argument to eBPF programs.
 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 */
struct bpf_context;


enum bpf_access_type {
	
BPF_READ = 1,
	
BPF_WRITE = 2
};

/* types of values stored in eBPF registers */
/* Pointer types represent:
 * pointer
 * pointer + imm
 * pointer + (u16) var
 * pointer + (u16) var + imm
 * if (range > 0) then [ptr, ptr + range - off) is safe to access
 * if (id > 0) means that some 'var' was added
 * if (off > 0) means that 'imm' was added
 */

enum bpf_reg_type {
	
NOT_INIT = 0,		 /* nothing was written into register */
	
SCALAR_VALUE,		 /* reg doesn't contain a valid pointer */
	
PTR_TO_CTX,		 /* reg points to bpf_context */
	
CONST_PTR_TO_MAP,	 /* reg points to struct bpf_map */
	
PTR_TO_MAP_VALUE,	 /* reg points to map element value */
	
PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
	
PTR_TO_STACK,		 /* reg == frame_pointer + offset */
	
PTR_TO_PACKET_META,	 /* skb->data - meta_len */
	
PTR_TO_PACKET,		 /* reg points to skb->data */
	
PTR_TO_PACKET_END,	 /* skb->data + headlen */
};

/* The information passed from prog-specific *_is_valid_access
 * back to the verifier.
 */

struct bpf_insn_access_aux {
	
enum bpf_reg_type reg_type;
	
int ctx_field_size;
};


static inline void bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) { aux->ctx_field_size = size; }

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Daniel Borkmann21100.00%1100.00%
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struct bpf_prog_ops { int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, union bpf_attr __user *uattr); }; struct bpf_verifier_ops { /* return eBPF function prototype for verification */ const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id); /* return true if 'size' wide access at offset 'off' within bpf_context * with 'type' (read or write) is allowed */ bool (*is_valid_access)(int off, int size, enum bpf_access_type type, struct bpf_insn_access_aux *info); int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, const struct bpf_prog *prog); u32 (*convert_ctx_access)(enum bpf_access_type type, const struct bpf_insn *src, struct bpf_insn *dst, struct bpf_prog *prog, u32 *target_size); }; struct bpf_dev_offload { struct bpf_prog *prog; struct net_device *netdev; void *dev_priv; struct list_head offloads; bool dev_state; bool verifier_running; wait_queue_head_t verifier_done; }; struct bpf_prog_aux { atomic_t refcnt; u32 used_map_cnt; u32 max_ctx_offset; u32 stack_depth; u32 id; struct latch_tree_node ksym_tnode; struct list_head ksym_lnode; const struct bpf_prog_ops *ops; struct bpf_map **used_maps; struct bpf_prog *prog; struct user_struct *user; u64 load_time; /* ns since boottime */ char name[BPF_OBJ_NAME_LEN]; #ifdef CONFIG_SECURITY void *security; #endif struct bpf_dev_offload *offload; union { struct work_struct work; struct rcu_head rcu; }; }; struct bpf_array { struct bpf_map map; u32 elem_size; u32 index_mask; /* 'ownership' of prog_array is claimed by the first program that * is going to use this map or by the first program which FD is stored * in the map to make sure that all callers and callees have the same * prog_type and JITed flag */ enum bpf_prog_type owner_prog_type; bool owner_jited; union { char value[0] __aligned(8); void *ptrs[0] __aligned(8); void __percpu *pptrs[0] __aligned(8); }; }; #define MAX_TAIL_CALL_CNT 32 struct bpf_event_entry { struct perf_event *event; struct file *perf_file; struct file *map_file; struct rcu_head rcu; }; bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); int bpf_prog_calc_tag(struct bpf_prog *fp); const struct bpf_func_proto *bpf_get_trace_printk_proto(void); typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, unsigned long off, unsigned long len); u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, union bpf_attr __user *uattr); int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, union bpf_attr __user *uattr); /* an array of programs to be executed under rcu_lock. * * Typical usage: * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); * * the structure returned by bpf_prog_array_alloc() should be populated * with program pointers and the last pointer must be NULL. * The user has to keep refcnt on the program and make sure the program * is removed from the array before bpf_prog_put(). * The 'struct bpf_prog_array *' should only be replaced with xchg() * since other cpus are walking the array of pointers in parallel. */ struct bpf_prog_array { struct rcu_head rcu; struct bpf_prog *progs[0]; }; struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, __u32 __user *prog_ids, u32 cnt); void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, struct bpf_prog *old_prog); int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, struct bpf_prog *exclude_prog, struct bpf_prog *include_prog, struct bpf_prog_array **new_array); #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ ({ \ struct bpf_prog **_prog, *__prog; \ struct bpf_prog_array *_array; \ u32 _ret = 1; \ rcu_read_lock(); \ _array = rcu_dereference(array); \ if (unlikely(check_non_null && !_array))\ goto _out; \ _prog = _array->progs; \ while ((__prog = READ_ONCE(*_prog))) { \ _ret &= func(__prog, ctx); \ _prog++; \ } \ _out: \ rcu_read_unlock(); \ _ret; \ }) #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ __BPF_PROG_RUN_ARRAY(array, ctx, func, false) #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ __BPF_PROG_RUN_ARRAY(array, ctx, func, true) #ifdef CONFIG_BPF_SYSCALL DECLARE_PER_CPU(int, bpf_prog_active); extern const struct file_operations bpf_map_fops; extern const struct file_operations bpf_prog_fops; #define BPF_PROG_TYPE(_id, _name) \ extern const struct bpf_prog_ops _name ## _prog_ops; \ extern const struct bpf_verifier_ops _name ## _verifier_ops; #define BPF_MAP_TYPE(_id, _ops) \ extern const struct bpf_map_ops _ops; #include <linux/bpf_types.h> #undef BPF_PROG_TYPE #undef BPF_MAP_TYPE extern const struct bpf_prog_ops bpf_offload_prog_ops; extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; extern const struct bpf_verifier_ops xdp_analyzer_ops; struct bpf_prog *bpf_prog_get(u32 ufd); struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, bool attach_drv); struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); void bpf_prog_sub(struct bpf_prog *prog, int i); struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); void bpf_prog_put(struct bpf_prog *prog); int __bpf_prog_charge(struct user_struct *user, u32 pages); void __bpf_prog_uncharge(struct user_struct *user, u32 pages); struct bpf_map *bpf_map_get_with_uref(u32 ufd); struct bpf_map *__bpf_map_get(struct fd f); struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); void bpf_map_put_with_uref(struct bpf_map *map); void bpf_map_put(struct bpf_map *map); int bpf_map_precharge_memlock(u32 pages); void *bpf_map_area_alloc(size_t size, int numa_node); void bpf_map_area_free(void *base); extern int sysctl_unprivileged_bpf_disabled; int bpf_map_new_fd(struct bpf_map *map, int flags); int bpf_prog_new_fd(struct bpf_prog *prog); int bpf_obj_pin_user(u32 ufd, const char __user *pathname); int bpf_obj_get_user(const char __user *pathname, int flags); int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, u64 flags); int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, u64 flags); int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, void *key, void *value, u64 map_flags); int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); void bpf_fd_array_map_clear(struct bpf_map *map); int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, void *key, void *value, u64 map_flags); int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); int bpf_get_file_flag(int flags); /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and * forced to use 'long' read/writes to try to atomically copy long counters. * Best-effort only. No barriers here, since it _will_ race with concurrent * updates from BPF programs. Called from bpf syscall and mostly used with * size 8 or 16 bytes, so ask compiler to inline it. */
static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) { const long *lsrc = src; long *ldst = dst; size /= sizeof(long); while (size--) *ldst++ = *lsrc++; }

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/* verify correctness of eBPF program */ int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); /* Map specifics */ struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key); void __dev_map_insert_ctx(struct bpf_map *map, u32 index); void __dev_map_flush(struct bpf_map *map); struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); void __cpu_map_flush(struct bpf_map *map); struct xdp_buff; int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, struct net_device *dev_rx); /* Return map's numa specified by userspace */
static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) { return (attr->map_flags & BPF_F_NUMA_NODE) ? attr->numa_node : NUMA_NO_NODE; }

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Martin KaFai Lau28100.00%1100.00%
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struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); #else /* !CONFIG_BPF_SYSCALL */
static inline struct bpf_prog *bpf_prog_get(u32 ufd) { return ERR_PTR(-EOPNOTSUPP); }

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Daniel Borkmann1157.89%150.00%
Alexei Starovoitov842.11%150.00%
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static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, bool attach_drv) { return ERR_PTR(-EOPNOTSUPP); }

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Jakub Kiciński26100.00%2100.00%
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static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i) { return ERR_PTR(-EOPNOTSUPP); }

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static inline void bpf_prog_sub(struct bpf_prog *prog, int i) { }

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static inline void bpf_prog_put(struct bpf_prog *prog) { }

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static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) { return ERR_PTR(-EOPNOTSUPP); }

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static inline struct bpf_prog *__must_check bpf_prog_inc_not_zero(struct bpf_prog *prog) { return ERR_PTR(-EOPNOTSUPP); }

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John Fastabend22100.00%1100.00%
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static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) { return 0; }

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static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) { }

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static inline int bpf_obj_get_user(const char __user *pathname, int flags) { return -EOPNOTSUPP; }

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Shmulik Ladkani1785.00%150.00%
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static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key) { return NULL; }

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static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) { }

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static inline void __dev_map_flush(struct bpf_map *map) { }

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static inline struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) { return NULL; }

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static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) { }

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static inline void __cpu_map_flush(struct bpf_map *map) { }

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struct xdp_buff;
static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, struct net_device *dev_rx) { return 0; }

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static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type) { return ERR_PTR(-EOPNOTSUPP); }

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Al Viro25100.00%1100.00%
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#endif /* CONFIG_BPF_SYSCALL */
static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type) { return bpf_prog_get_type_dev(ufd, type, false); }

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Jakub Kiciński26100.00%1100.00%
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bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); int bpf_prog_offload_compile(struct bpf_prog *prog); void bpf_prog_offload_destroy(struct bpf_prog *prog); #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) { return aux->offload; }

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#else
static inline int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr) { return -EOPNOTSUPP; }

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static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) { return false; }

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Jakub Kiciński15100.00%1100.00%
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#endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL) struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key); int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type); #else
static inline struct sock *__sock_map_lookup_elem(struct bpf_map *map, u32 key) { return NULL; }

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John Fastabend20100.00%1100.00%
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static inline int sock_map_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type) { return -EOPNOTSUPP; }

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John Fastabend24100.00%2100.00%
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#endif /* verifier prototypes for helper functions called from eBPF programs */ extern const struct bpf_func_proto bpf_map_lookup_elem_proto; extern const struct bpf_func_proto bpf_map_update_elem_proto; extern const struct bpf_func_proto bpf_map_delete_elem_proto; extern const struct bpf_func_proto bpf_get_prandom_u32_proto; extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; extern const struct bpf_func_proto bpf_get_numa_node_id_proto; extern const struct bpf_func_proto bpf_tail_call_proto; extern const struct bpf_func_proto bpf_ktime_get_ns_proto; extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; extern const struct bpf_func_proto bpf_get_current_comm_proto; extern const struct bpf_func_proto bpf_skb_vlan_push_proto; extern const struct bpf_func_proto bpf_skb_vlan_pop_proto; extern const struct bpf_func_proto bpf_get_stackid_proto; extern const struct bpf_func_proto bpf_sock_map_update_proto; /* Shared helpers among cBPF and eBPF. */ void bpf_user_rnd_init_once(void); u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); #endif /* _LINUX_BPF_H */

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Alexei Starovoitov92136.61%3532.41%
Daniel Borkmann56222.34%3431.48%
Jakub Kiciński25910.29%65.56%
John Fastabend2148.51%65.56%
Jesper Dangaard Brouer1315.21%10.93%
Martin KaFai Lau1295.13%98.33%
Yonghong Song853.38%32.78%
Al Viro542.15%10.93%
Brenden Blanco381.51%21.85%
Chenbo Feng371.47%32.78%
Wang Nan301.19%10.93%
Johannes Berg250.99%21.85%
Shmulik Ladkani170.68%10.93%
Edward Cree50.20%10.93%
Zi Shen Lim30.12%10.93%
David S. Miller30.12%10.93%
Gianluca Borello30.12%10.93%
Total2516100.00%108100.00%
Directory: include/linux
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