cregit-Linux how code gets into the kernel

Release 4.12 include/linux/filter.h

Directory: include/linux
/*
 * Linux Socket Filter Data Structures
 */
#ifndef __LINUX_FILTER_H__

#define __LINUX_FILTER_H__

#include <stdarg.h>

#include <linux/atomic.h>
#include <linux/refcount.h>
#include <linux/compat.h>
#include <linux/skbuff.h>
#include <linux/linkage.h>
#include <linux/printk.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/capability.h>
#include <linux/cryptohash.h>

#include <net/sch_generic.h>

#ifdef CONFIG_ARCH_HAS_SET_MEMORY
#include <asm/set_memory.h>
#endif

#include <uapi/linux/filter.h>
#include <uapi/linux/bpf.h>

struct sk_buff;
struct sock;
struct seccomp_data;
struct bpf_prog_aux;

/* ArgX, context and stack frame pointer register positions. Note,
 * Arg1, Arg2, Arg3, etc are used as argument mappings of function
 * calls in BPF_CALL instruction.
 */

#define BPF_REG_ARG1	BPF_REG_1

#define BPF_REG_ARG2	BPF_REG_2

#define BPF_REG_ARG3	BPF_REG_3

#define BPF_REG_ARG4	BPF_REG_4

#define BPF_REG_ARG5	BPF_REG_5

#define BPF_REG_CTX	BPF_REG_6

#define BPF_REG_FP	BPF_REG_10

/* Additional register mappings for converted user programs. */

#define BPF_REG_A	BPF_REG_0

#define BPF_REG_X	BPF_REG_7

#define BPF_REG_TMP	BPF_REG_8

/* Kernel hidden auxiliary/helper register for hardening step.
 * Only used by eBPF JITs. It's nothing more than a temporary
 * register that JITs use internally, only that here it's part
 * of eBPF instructions that have been rewritten for blinding
 * constants. See JIT pre-step in bpf_jit_blind_constants().
 */

#define BPF_REG_AX		MAX_BPF_REG

#define MAX_BPF_JIT_REG		(MAX_BPF_REG + 1)

/* As per nm, we expose JITed images as text (code) section for
 * kallsyms. That way, tools like perf can find it to match
 * addresses.
 */

#define BPF_SYM_ELF_TYPE	't'

/* BPF program can access up to 512 bytes of stack space. */

#define MAX_BPF_STACK	512


#define BPF_TAG_SIZE	8

/* Helper macros for filter block array initializers. */

/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */


#define BPF_ALU64_REG(OP, DST, SRC)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,        \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = 0 })


#define BPF_ALU32_REG(OP, DST, SRC)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU | BPF_OP(OP) | BPF_X,          \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = 0 })

/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */


#define BPF_ALU64_IMM(OP, DST, IMM)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,        \
                .dst_reg = DST,                                 \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = IMM })


#define BPF_ALU32_IMM(OP, DST, IMM)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU | BPF_OP(OP) | BPF_K,          \
                .dst_reg = DST,                                 \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = IMM })

/* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */


#define BPF_ENDIAN(TYPE, DST, LEN)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),     \
                .dst_reg = DST,                                 \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = LEN })

/* Short form of mov, dst_reg = src_reg */


#define BPF_MOV64_REG(DST, SRC)					\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = 0 })


#define BPF_MOV32_REG(DST, SRC)					\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU | BPF_MOV | BPF_X,             \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = 0 })

/* Short form of mov, dst_reg = imm32 */


#define BPF_MOV64_IMM(DST, IMM)					\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU64 | BPF_MOV | BPF_K,           \
                .dst_reg = DST,                                 \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = IMM })


#define BPF_MOV32_IMM(DST, IMM)					\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU | BPF_MOV | BPF_K,             \
                .dst_reg = DST,                                 \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = IMM })

/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */

#define BPF_LD_IMM64(DST, IMM)					\
	BPF_LD_IMM64_RAW(DST, 0, IMM)


#define BPF_LD_IMM64_RAW(DST, SRC, IMM)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_LD | BPF_DW | BPF_IMM,             \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = (__u32) (IMM) }),                      \
        ((struct bpf_insn) {                                    \
                .code  = 0, /* zero is reserved opcode */	\
                .dst_reg = 0,                                   \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = ((__u64) (IMM)) >> 32 })

/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */

#define BPF_LD_MAP_FD(DST, MAP_FD)				\
	BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)

/* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */


#define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)			\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),   \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = IMM })


#define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)			\
	((struct bpf_insn) {                                    \
                .code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),     \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = IMM })

/* Direct packet access, R0 = *(uint *) (skb->data + imm32) */


#define BPF_LD_ABS(SIZE, IMM)					\
	((struct bpf_insn) {                                    \
                .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,     \
                .dst_reg = 0,                                   \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = IMM })

/* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */


#define BPF_LD_IND(SIZE, SRC, IMM)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,     \
                .dst_reg = 0,                                   \
                .src_reg = SRC,                                 \
                .off   = 0,                                     \
                .imm   = IMM })

/* Memory load, dst_reg = *(uint *) (src_reg + off16) */


#define BPF_LDX_MEM(SIZE, DST, SRC, OFF)			\
	((struct bpf_insn) {                                    \
                .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,    \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = OFF,                                   \
                .imm   = 0 })

/* Memory store, *(uint *) (dst_reg + off16) = src_reg */


#define BPF_STX_MEM(SIZE, DST, SRC, OFF)			\
	((struct bpf_insn) {                                    \
                .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,    \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = OFF,                                   \
                .imm   = 0 })

/* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */


#define BPF_STX_XADD(SIZE, DST, SRC, OFF)			\
	((struct bpf_insn) {                                    \
                .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,   \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = OFF,                                   \
                .imm   = 0 })

/* Memory store, *(uint *) (dst_reg + off16) = imm32 */


#define BPF_ST_MEM(SIZE, DST, OFF, IMM)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,     \
                .dst_reg = DST,                                 \
                .src_reg = 0,                                   \
                .off   = OFF,                                   \
                .imm   = IMM })

/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */


#define BPF_JMP_REG(OP, DST, SRC, OFF)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_JMP | BPF_OP(OP) | BPF_X,          \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = OFF,                                   \
                .imm   = 0 })

/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */


#define BPF_JMP_IMM(OP, DST, IMM, OFF)				\
	((struct bpf_insn) {                                    \
                .code  = BPF_JMP | BPF_OP(OP) | BPF_K,          \
                .dst_reg = DST,                                 \
                .src_reg = 0,                                   \
                .off   = OFF,                                   \
                .imm   = IMM })

/* Unconditional jumps, goto pc + off16 */


#define BPF_JMP_A(OFF)						\
	((struct bpf_insn) {                                    \
                .code  = BPF_JMP | BPF_JA,                      \
                .dst_reg = 0,                                   \
                .src_reg = 0,                                   \
                .off   = OFF,                                   \
                .imm   = 0 })

/* Function call */


#define BPF_EMIT_CALL(FUNC)					\
	((struct bpf_insn) {                                    \
                .code  = BPF_JMP | BPF_CALL,                    \
                .dst_reg = 0,                                   \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = ((FUNC) - __bpf_call_base) })

/* Raw code statement block */


#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)			\
	((struct bpf_insn) {                                    \
                .code  = CODE,                                  \
                .dst_reg = DST,                                 \
                .src_reg = SRC,                                 \
                .off   = OFF,                                   \
                .imm   = IMM })

/* Program exit */


#define BPF_EXIT_INSN()						\
	((struct bpf_insn) {                                    \
                .code  = BPF_JMP | BPF_EXIT,                    \
                .dst_reg = 0,                                   \
                .src_reg = 0,                                   \
                .off   = 0,                                     \
                .imm   = 0 })

/* Internal classic blocks for direct assignment */


#define __BPF_STMT(CODE, K)					\
	((struct sock_filter) BPF_STMT(CODE, K))


#define __BPF_JUMP(CODE, K, JT, JF)				\
	((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))


#define bytes_to_bpf_size(bytes)				\
({                                                              \
        int bpf_size = -EINVAL;                                 \
                                                                \
        if (bytes == sizeof(u8))                                \
                bpf_size = BPF_B;                               \
        else if (bytes == sizeof(u16))                          \
                bpf_size = BPF_H;                               \
        else if (bytes == sizeof(u32))                          \
                bpf_size = BPF_W;                               \
        else if (bytes == sizeof(u64))                          \
                bpf_size = BPF_DW;                              \
                                                                \
        bpf_size;                                               \
})


#define BPF_SIZEOF(type)					\
	({                                                      \
                const int __size = bytes_to_bpf_size(sizeof(type)); \
                BUILD_BUG_ON(__size < 0);                       \
                __size;                                         \
        })


#define BPF_FIELD_SIZEOF(type, field)				\
	({                                                      \
                const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
                BUILD_BUG_ON(__size < 0);                       \
                __size;                                         \
        })


#define __BPF_MAP_0(m, v, ...) v

#define __BPF_MAP_1(m, v, t, a, ...) m(t, a)

#define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)

#define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)

#define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)

#define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)


#define __BPF_REG_0(...) __BPF_PAD(5)

#define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)

#define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)

#define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)

#define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)

#define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)


#define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)

#define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)


#define __BPF_CAST(t, a)						       \
	(__force t)                                                            \
        (__force                                                               \
         typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long),      \
                                      (unsigned long)0, (t)0))) a

#define __BPF_V void

#define __BPF_N


#define __BPF_DECL_ARGS(t, a) t   a

#define __BPF_DECL_REGS(t, a) u64 a


#define __BPF_PAD(n)							       \
	__BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2,       \
                  u64, __ur_3, u64, __ur_4, u64, __ur_5)


#define BPF_CALL_x(x, name, ...)					       \
	static __always_inline                                                 \
        u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__));   \
        u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__));         \
        u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__))          \
        {                                                                      \
                return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
        }                                                                      \
        static __always_inline                                                 \
        u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))


#define BPF_CALL_0(name, ...)	BPF_CALL_x(0, name, __VA_ARGS__)

#define BPF_CALL_1(name, ...)	BPF_CALL_x(1, name, __VA_ARGS__)

#define BPF_CALL_2(name, ...)	BPF_CALL_x(2, name, __VA_ARGS__)

#define BPF_CALL_3(name, ...)	BPF_CALL_x(3, name, __VA_ARGS__)

#define BPF_CALL_4(name, ...)	BPF_CALL_x(4, name, __VA_ARGS__)

#define BPF_CALL_5(name, ...)	BPF_CALL_x(5, name, __VA_ARGS__)

#ifdef CONFIG_COMPAT
/* A struct sock_filter is architecture independent. */

struct compat_sock_fprog {
	
u16		len;
	
compat_uptr_t	filter;	/* struct sock_filter * */
};
#endif


struct sock_fprog_kern {
	
u16			len;
	
struct sock_filter	*filter;
};


struct bpf_binary_header {
	
unsigned int pages;
	
u8 image[];
};


struct bpf_prog {
	
u16			pages;		/* Number of allocated pages */
	kmemcheck_bitfield_begin(meta);
	
u16			jited:1,	/* Is our filter JIT'ed? */
				
locked:1,	/* Program image locked? */
				
gpl_compatible:1, /* Is filter GPL compatible? */
				
cb_access:1,	/* Is control block accessed? */
				
dst_needed:1;	/* Do we need dst entry? */
	kmemcheck_bitfield_end(meta);
	
enum bpf_prog_type	type;		/* Type of BPF program */
	
u32			len;		/* Number of filter blocks */
	
u8			tag[BPF_TAG_SIZE];
	
struct bpf_prog_aux	*aux;		/* Auxiliary fields */
	
struct sock_fprog_kern	*orig_prog;	/* Original BPF program */
	
unsigned int		(*bpf_func)(const void *ctx,
					    const struct bpf_insn *insn);
	/* Instructions for interpreter */
	union {
		
struct sock_filter	insns[0];
		
struct bpf_insn		insnsi[0];
	};
};


struct sk_filter {
	
refcount_t	refcnt;
	
struct rcu_head	rcu;
	
struct bpf_prog	*prog;
};


#define BPF_PROG_RUN(filter, ctx)  (*filter->bpf_func)(ctx, filter->insnsi)


#define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN


struct bpf_skb_data_end {
	
struct qdisc_skb_cb qdisc_cb;
	
void *data_end;
};


struct xdp_buff {
	
void *data;
	
void *data_end;
	
void *data_hard_start;
};

/* compute the linear packet data range [data, data_end) which
 * will be accessed by cls_bpf, act_bpf and lwt programs
 */

static inline void bpf_compute_data_end(struct sk_buff *skb) { struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb; BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb)); cb->data_end = skb->data + skb_headlen(skb); }

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static inline u8 *bpf_skb_cb(struct sk_buff *skb) { /* eBPF programs may read/write skb->cb[] area to transfer meta * data between tail calls. Since this also needs to work with * tc, that scratch memory is mapped to qdisc_skb_cb's data area. * * In some socket filter cases, the cb unfortunately needs to be * saved/restored so that protocol specific skb->cb[] data won't * be lost. In any case, due to unpriviledged eBPF programs * attached to sockets, we need to clear the bpf_skb_cb() area * to not leak previous contents to user space. */ BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN); BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != FIELD_SIZEOF(struct qdisc_skb_cb, data)); return qdisc_skb_cb(skb)->data; }

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static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog, struct sk_buff *skb) { u8 *cb_data = bpf_skb_cb(skb); u8 cb_saved[BPF_SKB_CB_LEN]; u32 res; if (unlikely(prog->cb_access)) { memcpy(cb_saved, cb_data, sizeof(cb_saved)); memset(cb_data, 0, sizeof(cb_saved)); } res = BPF_PROG_RUN(prog, skb); if (unlikely(prog->cb_access)) memcpy(cb_data, cb_saved, sizeof(cb_saved)); return res; }

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static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog, struct sk_buff *skb) { u8 *cb_data = bpf_skb_cb(skb); if (unlikely(prog->cb_access)) memset(cb_data, 0, BPF_SKB_CB_LEN); return BPF_PROG_RUN(prog, skb); }

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static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog, struct xdp_buff *xdp) { /* Caller needs to hold rcu_read_lock() (!), otherwise program * can be released while still running, or map elements could be * freed early while still having concurrent users. XDP fastpath * already takes rcu_read_lock() when fetching the program, so * it's not necessary here anymore. */ return BPF_PROG_RUN(prog, xdp); }

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static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog) { return prog->len * sizeof(struct bpf_insn); }

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static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog) { return round_up(bpf_prog_insn_size(prog) + sizeof(__be64) + 1, SHA_MESSAGE_BYTES); }

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static inline unsigned int bpf_prog_size(unsigned int proglen) { return max(sizeof(struct bpf_prog), offsetof(struct bpf_prog, insns[proglen])); }

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static inline bool bpf_prog_was_classic(const struct bpf_prog *prog) { /* When classic BPF programs have been loaded and the arch * does not have a classic BPF JIT (anymore), they have been * converted via bpf_migrate_filter() to eBPF and thus always * have an unspec program type. */ return prog->type == BPF_PROG_TYPE_UNSPEC; }

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#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) #ifdef CONFIG_ARCH_HAS_SET_MEMORY
static inline void bpf_prog_lock_ro(struct bpf_prog *fp) { fp->locked = 1; WARN_ON_ONCE(set_memory_ro((unsigned long)fp, fp->pages)); }

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static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) { if (fp->locked) { WARN_ON_ONCE(set_memory_rw((unsigned long)fp, fp->pages)); /* In case set_memory_rw() fails, we want to be the first * to crash here instead of some random place later on. */ fp->locked = 0; } }

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static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr) { WARN_ON_ONCE(set_memory_ro((unsigned long)hdr, hdr->pages)); }

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static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header *hdr) { WARN_ON_ONCE(set_memory_rw((unsigned long)hdr, hdr->pages)); }

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#else
static inline void bpf_prog_lock_ro(struct bpf_prog *fp) { }

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Daniel Borkmann11100.00%1100.00%
Total11100.00%1100.00%


static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) { }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann11100.00%1100.00%
Total11100.00%1100.00%


static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr) { }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann11100.00%1100.00%
Total11100.00%1100.00%


static inline void bpf_jit_binary_unlock_ro(struct bpf_binary_header *hdr) { }

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Daniel Borkmann11100.00%1100.00%
Total11100.00%1100.00%

#endif /* CONFIG_ARCH_HAS_SET_MEMORY */
static inline struct bpf_binary_header * bpf_jit_binary_hdr(const struct bpf_prog *fp) { unsigned long real_start = (unsigned long)fp->bpf_func; unsigned long addr = real_start & PAGE_MASK; return (void *)addr; }

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Daniel Borkmann42100.00%1100.00%
Total42100.00%1100.00%

int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
static inline int sk_filter(struct sock *sk, struct sk_buff *skb) { return sk_filter_trim_cap(sk, skb, 1); }

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PersonTokensPropCommitsCommitProp
Willem de Bruijn27100.00%1100.00%
Total27100.00%1100.00%

struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err); void bpf_prog_free(struct bpf_prog *fp); struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, gfp_t gfp_extra_flags); void __bpf_prog_free(struct bpf_prog *fp);
static inline void bpf_prog_unlock_free(struct bpf_prog *fp) { bpf_prog_unlock_ro(fp); __bpf_prog_free(fp); }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann22100.00%1100.00%
Total22100.00%1100.00%

typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter, unsigned int flen); int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, bpf_aux_classic_check_t trans, bool save_orig); void bpf_prog_destroy(struct bpf_prog *fp); int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); int sk_attach_bpf(u32 ufd, struct sock *sk); int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk); int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk); int sk_detach_filter(struct sock *sk); int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned int len); bool sk_filter_charge(struct sock *sk, struct sk_filter *fp); void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog); void bpf_jit_compile(struct bpf_prog *prog); bool bpf_helper_changes_pkt_data(void *func); struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off, const struct bpf_insn *patch, u32 len); void bpf_warn_invalid_xdp_action(u32 act); #ifdef CONFIG_BPF_JIT extern int bpf_jit_enable; extern int bpf_jit_harden; extern int bpf_jit_kallsyms; typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); struct bpf_binary_header * bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, unsigned int alignment, bpf_jit_fill_hole_t bpf_fill_ill_insns); void bpf_jit_binary_free(struct bpf_binary_header *hdr); void bpf_jit_free(struct bpf_prog *fp); struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp); void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, u32 pass, void *image) { pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen, proglen, pass, image, current->comm, task_pid_nr(current)); if (image) print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, 16, 1, image, proglen, false); }

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Daniel Borkmann67100.00%2100.00%
Total67100.00%2100.00%


static inline bool bpf_jit_is_ebpf(void) { # ifdef CONFIG_HAVE_EBPF_JIT return true; # else return false; # endif }

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Daniel Borkmann22100.00%1100.00%
Total22100.00%1100.00%


static inline bool ebpf_jit_enabled(void) { return bpf_jit_enable && bpf_jit_is_ebpf(); }

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Alexei Starovoitov15100.00%1100.00%
Total15100.00%1100.00%


static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp) { return fp->jited && bpf_jit_is_ebpf(); }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann21100.00%1100.00%
Total21100.00%1100.00%


static inline bool bpf_jit_blinding_enabled(void) { /* These are the prerequisites, should someone ever have the * idea to call blinding outside of them, we make sure to * bail out. */ if (!bpf_jit_is_ebpf()) return false; if (!bpf_jit_enable) return false; if (!bpf_jit_harden) return false; if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN)) return false; return true; }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann52100.00%1100.00%
Total52100.00%1100.00%


static inline bool bpf_jit_kallsyms_enabled(void) { /* There are a couple of corner cases where kallsyms should * not be enabled f.e. on hardening. */ if (bpf_jit_harden) return false; if (!bpf_jit_kallsyms) return false; if (bpf_jit_kallsyms == 1) return true; return false; }

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Daniel Borkmann37100.00%1100.00%
Total37100.00%1100.00%

const char *__bpf_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char *sym); bool is_bpf_text_address(unsigned long addr); int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *sym);
static inline const char * bpf_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char **modname, char *sym) { const char *ret = __bpf_address_lookup(addr, size, off, sym); if (ret && modname) *modname = NULL; return ret; }

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Daniel Borkmann62100.00%1100.00%
Total62100.00%1100.00%

void bpf_prog_kallsyms_add(struct bpf_prog *fp); void bpf_prog_kallsyms_del(struct bpf_prog *fp); #else /* CONFIG_BPF_JIT */
static inline bool ebpf_jit_enabled(void) { return false; }

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PersonTokensPropCommitsCommitProp
Alexei Starovoitov12100.00%1100.00%
Total12100.00%1100.00%


static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp) { return false; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann16100.00%1100.00%
Total16100.00%1100.00%


static inline void bpf_jit_free(struct bpf_prog *fp) { bpf_prog_unlock_free(fp); }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann17100.00%1100.00%
Total17100.00%1100.00%


static inline bool bpf_jit_kallsyms_enabled(void) { return false; }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann12100.00%1100.00%
Total12100.00%1100.00%


static inline const char * __bpf_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char *sym) { return NULL; }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann30100.00%1100.00%
Total30100.00%1100.00%


static inline bool is_bpf_text_address(unsigned long addr) { return false; }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann14100.00%1100.00%
Total14100.00%1100.00%


static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *sym) { return -ERANGE; }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann28100.00%1100.00%
Total28100.00%1100.00%


static inline const char * bpf_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char **modname, char *sym) { return NULL; }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann35100.00%1100.00%
Total35100.00%1100.00%


static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp) { }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann11100.00%1100.00%
Total11100.00%1100.00%


static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp) { }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann11100.00%1100.00%
Total11100.00%1100.00%

#endif /* CONFIG_BPF_JIT */ #define BPF_ANC BIT(15)
static inline bool bpf_needs_clear_a(const struct sock_filter *first) { switch (first->code) { case BPF_RET | BPF_K: case BPF_LD | BPF_W | BPF_LEN: return false; case BPF_LD | BPF_W | BPF_ABS: case BPF_LD | BPF_H | BPF_ABS: case BPF_LD | BPF_B | BPF_ABS: if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X) return true; return false; default: return true; } }

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Rabin Vincent77100.00%1100.00%
Total77100.00%1100.00%


static inline u16 bpf_anc_helper(const struct sock_filter *ftest) { BUG_ON(ftest->code & BPF_ANC); switch (ftest->code) { case BPF_LD | BPF_W | BPF_ABS: case BPF_LD | BPF_H | BPF_ABS: case BPF_LD | BPF_B | BPF_ABS: #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ return BPF_ANC | SKF_AD_##CODE switch (ftest->k) { BPF_ANCILLARY(PROTOCOL); BPF_ANCILLARY(PKTTYPE); BPF_ANCILLARY(IFINDEX); BPF_ANCILLARY(NLATTR); BPF_ANCILLARY(NLATTR_NEST); BPF_ANCILLARY(MARK); BPF_ANCILLARY(QUEUE); BPF_ANCILLARY(HATYPE); BPF_ANCILLARY(RXHASH); BPF_ANCILLARY(CPU); BPF_ANCILLARY(ALU_XOR_X); BPF_ANCILLARY(VLAN_TAG); BPF_ANCILLARY(VLAN_TAG_PRESENT); BPF_ANCILLARY(PAY_OFFSET); BPF_ANCILLARY(RANDOM); BPF_ANCILLARY(VLAN_TPID); } /* Fallthrough. */ default: return ftest->code; } }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann14896.73%150.00%
Michal Sekletar53.27%150.00%
Total153100.00%2100.00%

void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, int k, unsigned int size);
static inline void *bpf_load_pointer(const struct sk_buff *skb, int k, unsigned int size, void *buffer) { if (k >= 0) return skb_header_pointer(skb, k, size, buffer); return bpf_internal_load_pointer_neg_helper(skb, k, size); }

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Zi Shen Lim53100.00%1100.00%
Total53100.00%1100.00%


static inline int bpf_tell_extensions(void) { return SKF_AD_MAX; }

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PersonTokensPropCommitsCommitProp
Michal Sekletar1191.67%150.00%
Daniel Borkmann18.33%150.00%
Total12100.00%2100.00%

#endif /* __LINUX_FILTER_H__ */

Overall Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann191564.87%3846.91%
Alexei Starovoitov58419.78%1923.46%
Rabin Vincent772.61%11.23%
Zi Shen Lim742.51%11.23%
Brenden Blanco441.49%11.23%
Stephen Hemminger421.42%33.70%
Willem de Bruijn321.08%11.23%
Linus Torvalds (pre-git)260.88%11.23%
Pavel Emelyanov260.88%22.47%
Craig Gallek260.88%11.23%
Jiri Pirko190.64%11.23%
Will Drewry190.64%11.23%
Michal Sekletar160.54%22.47%
Michael Holzheu150.51%11.23%
Eric Dumazet150.51%11.23%
Martin KaFai Lau60.20%11.23%
Laura Abbott60.20%11.23%
Elena Reshetova40.14%11.23%
Arnaldo Carvalho de Melo20.07%11.23%
David Howells20.07%11.23%
Thomas Graf10.03%11.23%
Linus Torvalds10.03%11.23%
Total2952100.00%81100.00%
Directory: include/linux
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