mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 23:53:55 +08:00
01dd194c38
Move the details behind the cb[] access into a small helper to decouple
and make them generic for bpf_prog_run_save_cb()/bpf_prog_run_clear_cb()
that was introduced via commit ff936a04e5 ("bpf: fix cb access in socket
filter programs"). Also add a comment to better clarify what is done in
bpf_skb_cb().
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
588 lines
15 KiB
C
588 lines
15 KiB
C
/*
|
|
* Linux Socket Filter Data Structures
|
|
*/
|
|
#ifndef __LINUX_FILTER_H__
|
|
#define __LINUX_FILTER_H__
|
|
|
|
#include <stdarg.h>
|
|
|
|
#include <linux/atomic.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 <net/sch_generic.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
|
|
#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
|
|
|
|
/* BPF program can access up to 512 bytes of stack space. */
|
|
#define MAX_BPF_STACK 512
|
|
|
|
/* 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 })
|
|
|
|
/* 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; \
|
|
})
|
|
|
|
#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? */
|
|
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);
|
|
u32 len; /* Number of filter blocks */
|
|
enum bpf_prog_type type; /* Type of BPF program */
|
|
struct bpf_prog_aux *aux; /* Auxiliary fields */
|
|
struct sock_fprog_kern *orig_prog; /* Original BPF program */
|
|
unsigned int (*bpf_func)(const struct sk_buff *skb,
|
|
const struct bpf_insn *filter);
|
|
/* Instructions for interpreter */
|
|
union {
|
|
struct sock_filter insns[0];
|
|
struct bpf_insn insnsi[0];
|
|
};
|
|
};
|
|
|
|
struct sk_filter {
|
|
atomic_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
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static inline unsigned int bpf_prog_size(unsigned int proglen)
|
|
{
|
|
return max(sizeof(struct bpf_prog),
|
|
offsetof(struct bpf_prog, insns[proglen]));
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
|
|
|
|
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
|
|
static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
|
|
{
|
|
set_memory_ro((unsigned long)fp, fp->pages);
|
|
}
|
|
|
|
static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
|
|
{
|
|
set_memory_rw((unsigned long)fp, fp->pages);
|
|
}
|
|
#else
|
|
static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_prog_unlock_ro(struct bpf_prog *fp)
|
|
{
|
|
}
|
|
#endif /* CONFIG_DEBUG_SET_MODULE_RONX */
|
|
|
|
int sk_filter(struct sock *sk, struct sk_buff *skb);
|
|
|
|
int bpf_prog_select_runtime(struct bpf_prog *fp);
|
|
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);
|
|
}
|
|
|
|
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);
|
|
void bpf_int_jit_compile(struct bpf_prog *fp);
|
|
bool bpf_helper_changes_skb_data(void *func);
|
|
|
|
#ifdef CONFIG_BPF_JIT
|
|
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_compile(struct bpf_prog *fp);
|
|
void bpf_jit_free(struct bpf_prog *fp);
|
|
|
|
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);
|
|
}
|
|
#else
|
|
static inline void bpf_jit_compile(struct bpf_prog *fp)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_jit_free(struct bpf_prog *fp)
|
|
{
|
|
bpf_prog_unlock_free(fp);
|
|
}
|
|
#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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static inline int bpf_tell_extensions(void)
|
|
{
|
|
return SKF_AD_MAX;
|
|
}
|
|
|
|
#endif /* __LINUX_FILTER_H__ */
|