1546 lines
42 KiB
C
1546 lines
42 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Linux Socket Filter Data Structures
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*/
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#ifndef __LINUX_FILTER_H__
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#define __LINUX_FILTER_H__
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#include <linux/atomic.h>
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#include <linux/bpf.h>
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#include <linux/refcount.h>
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#include <linux/compat.h>
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#include <linux/skbuff.h>
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#include <linux/linkage.h>
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#include <linux/printk.h>
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#include <linux/workqueue.h>
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#include <linux/sched.h>
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#include <linux/capability.h>
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#include <linux/set_memory.h>
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#include <linux/kallsyms.h>
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#include <linux/if_vlan.h>
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#include <linux/vmalloc.h>
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#include <linux/sockptr.h>
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#include <crypto/sha1.h>
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#include <linux/u64_stats_sync.h>
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#include <net/sch_generic.h>
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#include <asm/byteorder.h>
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#include <uapi/linux/filter.h>
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struct sk_buff;
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struct sock;
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struct seccomp_data;
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struct bpf_prog_aux;
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struct xdp_rxq_info;
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struct xdp_buff;
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struct sock_reuseport;
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struct ctl_table;
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struct ctl_table_header;
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/* ArgX, context and stack frame pointer register positions. Note,
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* Arg1, Arg2, Arg3, etc are used as argument mappings of function
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* calls in BPF_CALL instruction.
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*/
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#define BPF_REG_ARG1 BPF_REG_1
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#define BPF_REG_ARG2 BPF_REG_2
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#define BPF_REG_ARG3 BPF_REG_3
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#define BPF_REG_ARG4 BPF_REG_4
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#define BPF_REG_ARG5 BPF_REG_5
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#define BPF_REG_CTX BPF_REG_6
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#define BPF_REG_FP BPF_REG_10
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/* Additional register mappings for converted user programs. */
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#define BPF_REG_A BPF_REG_0
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#define BPF_REG_X BPF_REG_7
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#define BPF_REG_TMP BPF_REG_2 /* scratch reg */
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#define BPF_REG_D BPF_REG_8 /* data, callee-saved */
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#define BPF_REG_H BPF_REG_9 /* hlen, callee-saved */
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/* Kernel hidden auxiliary/helper register. */
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#define BPF_REG_AX MAX_BPF_REG
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#define MAX_BPF_EXT_REG (MAX_BPF_REG + 1)
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#define MAX_BPF_JIT_REG MAX_BPF_EXT_REG
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/* unused opcode to mark special call to bpf_tail_call() helper */
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#define BPF_TAIL_CALL 0xf0
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/* unused opcode to mark special load instruction. Same as BPF_ABS */
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#define BPF_PROBE_MEM 0x20
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/* unused opcode to mark call to interpreter with arguments */
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#define BPF_CALL_ARGS 0xe0
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/* unused opcode to mark speculation barrier for mitigating
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* Speculative Store Bypass
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*/
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#define BPF_NOSPEC 0xc0
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/* As per nm, we expose JITed images as text (code) section for
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* kallsyms. That way, tools like perf can find it to match
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* addresses.
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*/
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#define BPF_SYM_ELF_TYPE 't'
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/* BPF program can access up to 512 bytes of stack space. */
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#define MAX_BPF_STACK 512
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/* Helper macros for filter block array initializers. */
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/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
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#define BPF_ALU64_REG(OP, DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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#define BPF_ALU32_REG(OP, DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_OP(OP) | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
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#define BPF_ALU64_IMM(OP, DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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#define BPF_ALU32_IMM(OP, DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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/* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
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#define BPF_ENDIAN(TYPE, DST, LEN) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = LEN })
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/* Short form of mov, dst_reg = src_reg */
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#define BPF_MOV64_REG(DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_MOV | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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#define BPF_MOV32_REG(DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_MOV | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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/* Short form of mov, dst_reg = imm32 */
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#define BPF_MOV64_IMM(DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_MOV | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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#define BPF_MOV32_IMM(DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_MOV | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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/* Special form of mov32, used for doing explicit zero extension on dst. */
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#define BPF_ZEXT_REG(DST) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_MOV | BPF_X, \
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.dst_reg = DST, \
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.src_reg = DST, \
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.off = 0, \
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.imm = 1 })
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static inline bool insn_is_zext(const struct bpf_insn *insn)
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{
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return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1;
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}
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/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
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#define BPF_LD_IMM64(DST, IMM) \
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BPF_LD_IMM64_RAW(DST, 0, IMM)
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#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
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((struct bpf_insn) { \
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.code = BPF_LD | BPF_DW | BPF_IMM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = (__u32) (IMM) }), \
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((struct bpf_insn) { \
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.code = 0, /* zero is reserved opcode */ \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = ((__u64) (IMM)) >> 32 })
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/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
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#define BPF_LD_MAP_FD(DST, MAP_FD) \
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BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
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/* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
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#define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = IMM })
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#define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = IMM })
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/* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
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#define BPF_LD_ABS(SIZE, IMM) \
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((struct bpf_insn) { \
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.code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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/* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
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#define BPF_LD_IND(SIZE, SRC, IMM) \
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((struct bpf_insn) { \
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.code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \
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.dst_reg = 0, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = IMM })
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/* Memory load, dst_reg = *(uint *) (src_reg + off16) */
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#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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/* Memory store, *(uint *) (dst_reg + off16) = src_reg */
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#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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/*
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* Atomic operations:
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*
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* BPF_ADD *(uint *) (dst_reg + off16) += src_reg
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* BPF_AND *(uint *) (dst_reg + off16) &= src_reg
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* BPF_OR *(uint *) (dst_reg + off16) |= src_reg
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* BPF_XOR *(uint *) (dst_reg + off16) ^= src_reg
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* BPF_ADD | BPF_FETCH src_reg = atomic_fetch_add(dst_reg + off16, src_reg);
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* BPF_AND | BPF_FETCH src_reg = atomic_fetch_and(dst_reg + off16, src_reg);
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* BPF_OR | BPF_FETCH src_reg = atomic_fetch_or(dst_reg + off16, src_reg);
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* BPF_XOR | BPF_FETCH src_reg = atomic_fetch_xor(dst_reg + off16, src_reg);
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* BPF_XCHG src_reg = atomic_xchg(dst_reg + off16, src_reg)
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* BPF_CMPXCHG r0 = atomic_cmpxchg(dst_reg + off16, r0, src_reg)
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*/
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#define BPF_ATOMIC_OP(SIZE, OP, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_STX | BPF_SIZE(SIZE) | BPF_ATOMIC, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = OP })
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/* Legacy alias */
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#define BPF_STX_XADD(SIZE, DST, SRC, OFF) BPF_ATOMIC_OP(SIZE, BPF_ADD, DST, SRC, OFF)
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/* Memory store, *(uint *) (dst_reg + off16) = imm32 */
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#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = OFF, \
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.imm = IMM })
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/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
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#define BPF_JMP_REG(OP, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_OP(OP) | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
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#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = OFF, \
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.imm = IMM })
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/* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */
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#define BPF_JMP32_REG(OP, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP32 | BPF_OP(OP) | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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/* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */
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#define BPF_JMP32_IMM(OP, DST, IMM, OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP32 | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = OFF, \
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.imm = IMM })
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/* Unconditional jumps, goto pc + off16 */
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#define BPF_JMP_A(OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_JA, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = OFF, \
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.imm = 0 })
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/* Relative call */
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#define BPF_CALL_REL(TGT) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_CALL, \
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.dst_reg = 0, \
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.src_reg = BPF_PSEUDO_CALL, \
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.off = 0, \
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.imm = TGT })
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/* Convert function address to BPF immediate */
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#define BPF_CALL_IMM(x) ((void *)(x) - (void *)__bpf_call_base)
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#define BPF_EMIT_CALL(FUNC) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_CALL, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = BPF_CALL_IMM(FUNC) })
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/* Raw code statement block */
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#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
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((struct bpf_insn) { \
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.code = CODE, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = IMM })
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/* Program exit */
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#define BPF_EXIT_INSN() \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_EXIT, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = 0 })
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/* Speculation barrier */
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#define BPF_ST_NOSPEC() \
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((struct bpf_insn) { \
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.code = BPF_ST | BPF_NOSPEC, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = 0 })
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/* Internal classic blocks for direct assignment */
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#define __BPF_STMT(CODE, K) \
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((struct sock_filter) BPF_STMT(CODE, K))
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#define __BPF_JUMP(CODE, K, JT, JF) \
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((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
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#define bytes_to_bpf_size(bytes) \
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({ \
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int bpf_size = -EINVAL; \
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\
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if (bytes == sizeof(u8)) \
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bpf_size = BPF_B; \
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else if (bytes == sizeof(u16)) \
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bpf_size = BPF_H; \
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else if (bytes == sizeof(u32)) \
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bpf_size = BPF_W; \
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else if (bytes == sizeof(u64)) \
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bpf_size = BPF_DW; \
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\
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bpf_size; \
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})
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#define bpf_size_to_bytes(bpf_size) \
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({ \
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int bytes = -EINVAL; \
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\
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if (bpf_size == BPF_B) \
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bytes = sizeof(u8); \
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else if (bpf_size == BPF_H) \
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bytes = sizeof(u16); \
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else if (bpf_size == BPF_W) \
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bytes = sizeof(u32); \
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else if (bpf_size == BPF_DW) \
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bytes = sizeof(u64); \
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\
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bytes; \
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})
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#define BPF_SIZEOF(type) \
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({ \
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const int __size = bytes_to_bpf_size(sizeof(type)); \
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BUILD_BUG_ON(__size < 0); \
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__size; \
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})
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#define BPF_FIELD_SIZEOF(type, field) \
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({ \
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const int __size = bytes_to_bpf_size(sizeof_field(type, field)); \
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BUILD_BUG_ON(__size < 0); \
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__size; \
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})
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#define BPF_LDST_BYTES(insn) \
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({ \
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const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
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WARN_ON(__size < 0); \
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__size; \
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})
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#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__)); \
|
|
typedef u64 (*btf_##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 ((btf_##name)____##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__)
|
|
|
|
#define bpf_ctx_range(TYPE, MEMBER) \
|
|
offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
|
|
#define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2) \
|
|
offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
|
|
#if BITS_PER_LONG == 64
|
|
# define bpf_ctx_range_ptr(TYPE, MEMBER) \
|
|
offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
|
|
#else
|
|
# define bpf_ctx_range_ptr(TYPE, MEMBER) \
|
|
offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
|
|
#endif /* BITS_PER_LONG == 64 */
|
|
|
|
#define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE) \
|
|
({ \
|
|
BUILD_BUG_ON(sizeof_field(TYPE, MEMBER) != (SIZE)); \
|
|
*(PTR_SIZE) = (SIZE); \
|
|
offsetof(TYPE, MEMBER); \
|
|
})
|
|
|
|
/* A struct sock_filter is architecture independent. */
|
|
struct compat_sock_fprog {
|
|
u16 len;
|
|
compat_uptr_t filter; /* struct sock_filter * */
|
|
};
|
|
|
|
struct sock_fprog_kern {
|
|
u16 len;
|
|
struct sock_filter *filter;
|
|
};
|
|
|
|
/* Some arches need doubleword alignment for their instructions and/or data */
|
|
#define BPF_IMAGE_ALIGNMENT 8
|
|
|
|
struct bpf_binary_header {
|
|
u32 size;
|
|
u8 image[] __aligned(BPF_IMAGE_ALIGNMENT);
|
|
};
|
|
|
|
struct bpf_prog_stats {
|
|
u64_stats_t cnt;
|
|
u64_stats_t nsecs;
|
|
u64_stats_t misses;
|
|
struct u64_stats_sync syncp;
|
|
} __aligned(2 * sizeof(u64));
|
|
|
|
struct sk_filter {
|
|
refcount_t refcnt;
|
|
struct rcu_head rcu;
|
|
struct bpf_prog *prog;
|
|
};
|
|
|
|
DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
|
|
|
|
extern struct mutex nf_conn_btf_access_lock;
|
|
extern int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, const struct btf *btf,
|
|
const struct btf_type *t, int off, int size,
|
|
enum bpf_access_type atype, u32 *next_btf_id,
|
|
enum bpf_type_flag *flag);
|
|
|
|
typedef unsigned int (*bpf_dispatcher_fn)(const void *ctx,
|
|
const struct bpf_insn *insnsi,
|
|
unsigned int (*bpf_func)(const void *,
|
|
const struct bpf_insn *));
|
|
|
|
static __always_inline u32 __bpf_prog_run(const struct bpf_prog *prog,
|
|
const void *ctx,
|
|
bpf_dispatcher_fn dfunc)
|
|
{
|
|
u32 ret;
|
|
|
|
cant_migrate();
|
|
if (static_branch_unlikely(&bpf_stats_enabled_key)) {
|
|
struct bpf_prog_stats *stats;
|
|
u64 start = sched_clock();
|
|
unsigned long flags;
|
|
|
|
ret = dfunc(ctx, prog->insnsi, prog->bpf_func);
|
|
stats = this_cpu_ptr(prog->stats);
|
|
flags = u64_stats_update_begin_irqsave(&stats->syncp);
|
|
u64_stats_inc(&stats->cnt);
|
|
u64_stats_add(&stats->nsecs, sched_clock() - start);
|
|
u64_stats_update_end_irqrestore(&stats->syncp, flags);
|
|
} else {
|
|
ret = dfunc(ctx, prog->insnsi, prog->bpf_func);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static __always_inline u32 bpf_prog_run(const struct bpf_prog *prog, const void *ctx)
|
|
{
|
|
return __bpf_prog_run(prog, ctx, bpf_dispatcher_nop_func);
|
|
}
|
|
|
|
/*
|
|
* Use in preemptible and therefore migratable context to make sure that
|
|
* the execution of the BPF program runs on one CPU.
|
|
*
|
|
* This uses migrate_disable/enable() explicitly to document that the
|
|
* invocation of a BPF program does not require reentrancy protection
|
|
* against a BPF program which is invoked from a preempting task.
|
|
*/
|
|
static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
|
|
const void *ctx)
|
|
{
|
|
u32 ret;
|
|
|
|
migrate_disable();
|
|
ret = bpf_prog_run(prog, ctx);
|
|
migrate_enable();
|
|
return ret;
|
|
}
|
|
|
|
#define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
|
|
|
|
struct bpf_skb_data_end {
|
|
struct qdisc_skb_cb qdisc_cb;
|
|
void *data_meta;
|
|
void *data_end;
|
|
};
|
|
|
|
struct bpf_nh_params {
|
|
u32 nh_family;
|
|
union {
|
|
u32 ipv4_nh;
|
|
struct in6_addr ipv6_nh;
|
|
};
|
|
};
|
|
|
|
struct bpf_redirect_info {
|
|
u32 flags;
|
|
u32 tgt_index;
|
|
void *tgt_value;
|
|
struct bpf_map *map;
|
|
u32 map_id;
|
|
enum bpf_map_type map_type;
|
|
u32 kern_flags;
|
|
struct bpf_nh_params nh;
|
|
};
|
|
|
|
DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
|
|
|
|
/* flags for bpf_redirect_info kern_flags */
|
|
#define BPF_RI_F_RF_NO_DIRECT BIT(0) /* no napi_direct on return_frame */
|
|
|
|
/* Compute the linear packet data range [data, data_end) which
|
|
* will be accessed by various program types (cls_bpf, act_bpf,
|
|
* lwt, ...). Subsystems allowing direct data access must (!)
|
|
* ensure that cb[] area can be written to when BPF program is
|
|
* invoked (otherwise cb[] save/restore is necessary).
|
|
*/
|
|
static inline void bpf_compute_data_pointers(struct sk_buff *skb)
|
|
{
|
|
struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
|
|
|
|
BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
|
|
cb->data_meta = skb->data - skb_metadata_len(skb);
|
|
cb->data_end = skb->data + skb_headlen(skb);
|
|
}
|
|
|
|
/* Similar to bpf_compute_data_pointers(), except that save orginal
|
|
* data in cb->data and cb->meta_data for restore.
|
|
*/
|
|
static inline void bpf_compute_and_save_data_end(
|
|
struct sk_buff *skb, void **saved_data_end)
|
|
{
|
|
struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
|
|
|
|
*saved_data_end = cb->data_end;
|
|
cb->data_end = skb->data + skb_headlen(skb);
|
|
}
|
|
|
|
/* Restore data saved by bpf_compute_data_pointers(). */
|
|
static inline void bpf_restore_data_end(
|
|
struct sk_buff *skb, void *saved_data_end)
|
|
{
|
|
struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
|
|
|
|
cb->data_end = saved_data_end;
|
|
}
|
|
|
|
static inline u8 *bpf_skb_cb(const 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(sizeof_field(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
|
|
BUILD_BUG_ON(sizeof_field(struct __sk_buff, cb) !=
|
|
sizeof_field(struct qdisc_skb_cb, data));
|
|
|
|
return qdisc_skb_cb(skb)->data;
|
|
}
|
|
|
|
/* Must be invoked with migration disabled */
|
|
static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
|
|
const void *ctx)
|
|
{
|
|
const struct sk_buff *skb = ctx;
|
|
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_save_cb(const struct bpf_prog *prog,
|
|
struct sk_buff *skb)
|
|
{
|
|
u32 res;
|
|
|
|
migrate_disable();
|
|
res = __bpf_prog_run_save_cb(prog, skb);
|
|
migrate_enable();
|
|
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);
|
|
u32 res;
|
|
|
|
if (unlikely(prog->cb_access))
|
|
memset(cb_data, 0, BPF_SKB_CB_LEN);
|
|
|
|
res = bpf_prog_run_pin_on_cpu(prog, skb);
|
|
return res;
|
|
}
|
|
|
|
DECLARE_BPF_DISPATCHER(xdp)
|
|
|
|
DECLARE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key);
|
|
|
|
u32 xdp_master_redirect(struct xdp_buff *xdp);
|
|
|
|
static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
|
|
struct xdp_buff *xdp)
|
|
{
|
|
/* Driver XDP hooks are invoked within a single NAPI poll cycle and thus
|
|
* under local_bh_disable(), which provides the needed RCU protection
|
|
* for accessing map entries.
|
|
*/
|
|
u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
|
|
|
|
if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) {
|
|
if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev))
|
|
act = xdp_master_redirect(xdp);
|
|
}
|
|
|
|
return act;
|
|
}
|
|
|
|
void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog);
|
|
|
|
static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
|
|
{
|
|
return prog->len * sizeof(struct bpf_insn);
|
|
}
|
|
|
|
static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
|
|
{
|
|
return round_up(bpf_prog_insn_size(prog) +
|
|
sizeof(__be64) + 1, SHA1_BLOCK_SIZE);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline u32 bpf_ctx_off_adjust_machine(u32 size)
|
|
{
|
|
const u32 size_machine = sizeof(unsigned long);
|
|
|
|
if (size > size_machine && size % size_machine == 0)
|
|
size = size_machine;
|
|
|
|
return size;
|
|
}
|
|
|
|
static inline bool
|
|
bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
|
|
{
|
|
return size <= size_default && (size & (size - 1)) == 0;
|
|
}
|
|
|
|
static inline u8
|
|
bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default)
|
|
{
|
|
u8 access_off = off & (size_default - 1);
|
|
|
|
#ifdef __LITTLE_ENDIAN
|
|
return access_off;
|
|
#else
|
|
return size_default - (access_off + size);
|
|
#endif
|
|
}
|
|
|
|
#define bpf_ctx_wide_access_ok(off, size, type, field) \
|
|
(size == sizeof(__u64) && \
|
|
off >= offsetof(type, field) && \
|
|
off + sizeof(__u64) <= offsetofend(type, field) && \
|
|
off % sizeof(__u64) == 0)
|
|
|
|
#define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
|
|
|
|
static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
|
|
{
|
|
#ifndef CONFIG_BPF_JIT_ALWAYS_ON
|
|
if (!fp->jited) {
|
|
set_vm_flush_reset_perms(fp);
|
|
set_memory_ro((unsigned long)fp, fp->pages);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
|
|
{
|
|
set_vm_flush_reset_perms(hdr);
|
|
set_memory_ro((unsigned long)hdr, hdr->size >> PAGE_SHIFT);
|
|
set_memory_x((unsigned long)hdr, hdr->size >> PAGE_SHIFT);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
|
|
void bpf_prog_free(struct bpf_prog *fp);
|
|
|
|
bool bpf_opcode_in_insntable(u8 code);
|
|
|
|
void bpf_prog_free_linfo(struct bpf_prog *prog);
|
|
void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
|
|
const u32 *insn_to_jit_off);
|
|
int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
|
|
void bpf_prog_jit_attempt_done(struct bpf_prog *prog);
|
|
|
|
struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
|
|
struct bpf_prog *bpf_prog_alloc_no_stats(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_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);
|
|
void sk_reuseport_prog_free(struct bpf_prog *prog);
|
|
int sk_detach_filter(struct sock *sk);
|
|
int sk_get_filter(struct sock *sk, sockptr_t optval, 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);
|
|
#define __bpf_call_base_args \
|
|
((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
|
|
(void *)__bpf_call_base)
|
|
|
|
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
|
|
void bpf_jit_compile(struct bpf_prog *prog);
|
|
bool bpf_jit_needs_zext(void);
|
|
bool bpf_jit_supports_subprog_tailcalls(void);
|
|
bool bpf_jit_supports_kfunc_call(void);
|
|
bool bpf_helper_changes_pkt_data(void *func);
|
|
|
|
static inline bool bpf_dump_raw_ok(const struct cred *cred)
|
|
{
|
|
/* Reconstruction of call-sites is dependent on kallsyms,
|
|
* thus make dump the same restriction.
|
|
*/
|
|
return kallsyms_show_value(cred);
|
|
}
|
|
|
|
struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
|
|
const struct bpf_insn *patch, u32 len);
|
|
int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
|
|
|
|
void bpf_clear_redirect_map(struct bpf_map *map);
|
|
|
|
static inline bool xdp_return_frame_no_direct(void)
|
|
{
|
|
struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
|
|
|
|
return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
|
|
}
|
|
|
|
static inline void xdp_set_return_frame_no_direct(void)
|
|
{
|
|
struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
|
|
|
|
ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
|
|
}
|
|
|
|
static inline void xdp_clear_return_frame_no_direct(void)
|
|
{
|
|
struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
|
|
|
|
ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
|
|
}
|
|
|
|
static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
|
|
unsigned int pktlen)
|
|
{
|
|
unsigned int len;
|
|
|
|
if (unlikely(!(fwd->flags & IFF_UP)))
|
|
return -ENETDOWN;
|
|
|
|
len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
|
|
if (pktlen > len)
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* The pair of xdp_do_redirect and xdp_do_flush MUST be called in the
|
|
* same cpu context. Further for best results no more than a single map
|
|
* for the do_redirect/do_flush pair should be used. This limitation is
|
|
* because we only track one map and force a flush when the map changes.
|
|
* This does not appear to be a real limitation for existing software.
|
|
*/
|
|
int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
|
|
struct xdp_buff *xdp, struct bpf_prog *prog);
|
|
int xdp_do_redirect(struct net_device *dev,
|
|
struct xdp_buff *xdp,
|
|
struct bpf_prog *prog);
|
|
int xdp_do_redirect_frame(struct net_device *dev,
|
|
struct xdp_buff *xdp,
|
|
struct xdp_frame *xdpf,
|
|
struct bpf_prog *prog);
|
|
void xdp_do_flush(void);
|
|
|
|
/* The xdp_do_flush_map() helper has been renamed to drop the _map suffix, as
|
|
* it is no longer only flushing maps. Keep this define for compatibility
|
|
* until all drivers are updated - do not use xdp_do_flush_map() in new code!
|
|
*/
|
|
#define xdp_do_flush_map xdp_do_flush
|
|
|
|
void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act);
|
|
|
|
#ifdef CONFIG_INET
|
|
struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
|
|
struct bpf_prog *prog, struct sk_buff *skb,
|
|
struct sock *migrating_sk,
|
|
u32 hash);
|
|
#else
|
|
static inline struct sock *
|
|
bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
|
|
struct bpf_prog *prog, struct sk_buff *skb,
|
|
struct sock *migrating_sk,
|
|
u32 hash)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_BPF_JIT
|
|
extern int bpf_jit_enable;
|
|
extern int bpf_jit_harden;
|
|
extern int bpf_jit_kallsyms;
|
|
extern long bpf_jit_limit;
|
|
extern long bpf_jit_limit_max;
|
|
|
|
typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
|
|
|
|
void bpf_jit_fill_hole_with_zero(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);
|
|
u64 bpf_jit_alloc_exec_limit(void);
|
|
void *bpf_jit_alloc_exec(unsigned long size);
|
|
void bpf_jit_free_exec(void *addr);
|
|
void bpf_jit_free(struct bpf_prog *fp);
|
|
struct bpf_binary_header *
|
|
bpf_jit_binary_pack_hdr(const struct bpf_prog *fp);
|
|
|
|
void *bpf_prog_pack_alloc(u32 size, bpf_jit_fill_hole_t bpf_fill_ill_insns);
|
|
void bpf_prog_pack_free(struct bpf_binary_header *hdr);
|
|
|
|
static inline bool bpf_prog_kallsyms_verify_off(const struct bpf_prog *fp)
|
|
{
|
|
return list_empty(&fp->aux->ksym.lnode) ||
|
|
fp->aux->ksym.lnode.prev == LIST_POISON2;
|
|
}
|
|
|
|
struct bpf_binary_header *
|
|
bpf_jit_binary_pack_alloc(unsigned int proglen, u8 **ro_image,
|
|
unsigned int alignment,
|
|
struct bpf_binary_header **rw_hdr,
|
|
u8 **rw_image,
|
|
bpf_jit_fill_hole_t bpf_fill_ill_insns);
|
|
int bpf_jit_binary_pack_finalize(struct bpf_prog *prog,
|
|
struct bpf_binary_header *ro_header,
|
|
struct bpf_binary_header *rw_header);
|
|
void bpf_jit_binary_pack_free(struct bpf_binary_header *ro_header,
|
|
struct bpf_binary_header *rw_header);
|
|
|
|
int bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
|
|
struct bpf_jit_poke_descriptor *poke);
|
|
|
|
int bpf_jit_get_func_addr(const struct bpf_prog *prog,
|
|
const struct bpf_insn *insn, bool extra_pass,
|
|
u64 *func_addr, bool *func_addr_fixed);
|
|
|
|
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);
|
|
}
|
|
|
|
static inline bool bpf_jit_is_ebpf(void)
|
|
{
|
|
# ifdef CONFIG_HAVE_EBPF_JIT
|
|
return true;
|
|
# else
|
|
return false;
|
|
# endif
|
|
}
|
|
|
|
static inline bool ebpf_jit_enabled(void)
|
|
{
|
|
return bpf_jit_enable && bpf_jit_is_ebpf();
|
|
}
|
|
|
|
static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
|
|
{
|
|
return fp->jited && bpf_jit_is_ebpf();
|
|
}
|
|
|
|
static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
|
|
{
|
|
/* 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 (!prog->jit_requested)
|
|
return false;
|
|
if (!bpf_jit_harden)
|
|
return false;
|
|
if (bpf_jit_harden == 1 && bpf_capable())
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline int
|
|
bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
|
|
struct bpf_jit_poke_descriptor *poke)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline void bpf_jit_free(struct bpf_prog *fp)
|
|
{
|
|
bpf_prog_unlock_free(fp);
|
|
}
|
|
|
|
static inline bool bpf_jit_kallsyms_enabled(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline const char *
|
|
__bpf_address_lookup(unsigned long addr, unsigned long *size,
|
|
unsigned long *off, char *sym)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline bool is_bpf_text_address(unsigned long addr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
|
|
char *type, char *sym)
|
|
{
|
|
return -ERANGE;
|
|
}
|
|
|
|
static inline const char *
|
|
bpf_address_lookup(unsigned long addr, unsigned long *size,
|
|
unsigned long *off, char **modname, char *sym)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
|
|
{
|
|
}
|
|
|
|
static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_BPF_JIT */
|
|
|
|
void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
|
|
|
|
#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 int bpf_tell_extensions(void)
|
|
{
|
|
return SKF_AD_MAX;
|
|
}
|
|
|
|
struct bpf_sock_addr_kern {
|
|
struct sock *sk;
|
|
struct sockaddr *uaddr;
|
|
/* Temporary "register" to make indirect stores to nested structures
|
|
* defined above. We need three registers to make such a store, but
|
|
* only two (src and dst) are available at convert_ctx_access time
|
|
*/
|
|
u64 tmp_reg;
|
|
void *t_ctx; /* Attach type specific context. */
|
|
};
|
|
|
|
struct bpf_sock_ops_kern {
|
|
struct sock *sk;
|
|
union {
|
|
u32 args[4];
|
|
u32 reply;
|
|
u32 replylong[4];
|
|
};
|
|
struct sk_buff *syn_skb;
|
|
struct sk_buff *skb;
|
|
void *skb_data_end;
|
|
u8 op;
|
|
u8 is_fullsock;
|
|
u8 remaining_opt_len;
|
|
u64 temp; /* temp and everything after is not
|
|
* initialized to 0 before calling
|
|
* the BPF program. New fields that
|
|
* should be initialized to 0 should
|
|
* be inserted before temp.
|
|
* temp is scratch storage used by
|
|
* sock_ops_convert_ctx_access
|
|
* as temporary storage of a register.
|
|
*/
|
|
};
|
|
|
|
struct bpf_sysctl_kern {
|
|
struct ctl_table_header *head;
|
|
struct ctl_table *table;
|
|
void *cur_val;
|
|
size_t cur_len;
|
|
void *new_val;
|
|
size_t new_len;
|
|
int new_updated;
|
|
int write;
|
|
loff_t *ppos;
|
|
/* Temporary "register" for indirect stores to ppos. */
|
|
u64 tmp_reg;
|
|
};
|
|
|
|
#define BPF_SOCKOPT_KERN_BUF_SIZE 32
|
|
struct bpf_sockopt_buf {
|
|
u8 data[BPF_SOCKOPT_KERN_BUF_SIZE];
|
|
};
|
|
|
|
struct bpf_sockopt_kern {
|
|
struct sock *sk;
|
|
u8 *optval;
|
|
u8 *optval_end;
|
|
s32 level;
|
|
s32 optname;
|
|
s32 optlen;
|
|
/* for retval in struct bpf_cg_run_ctx */
|
|
struct task_struct *current_task;
|
|
/* Temporary "register" for indirect stores to ppos. */
|
|
u64 tmp_reg;
|
|
};
|
|
|
|
int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len);
|
|
|
|
struct bpf_sk_lookup_kern {
|
|
u16 family;
|
|
u16 protocol;
|
|
__be16 sport;
|
|
u16 dport;
|
|
struct {
|
|
__be32 saddr;
|
|
__be32 daddr;
|
|
} v4;
|
|
struct {
|
|
const struct in6_addr *saddr;
|
|
const struct in6_addr *daddr;
|
|
} v6;
|
|
struct sock *selected_sk;
|
|
u32 ingress_ifindex;
|
|
bool no_reuseport;
|
|
};
|
|
|
|
extern struct static_key_false bpf_sk_lookup_enabled;
|
|
|
|
/* Runners for BPF_SK_LOOKUP programs to invoke on socket lookup.
|
|
*
|
|
* Allowed return values for a BPF SK_LOOKUP program are SK_PASS and
|
|
* SK_DROP. Their meaning is as follows:
|
|
*
|
|
* SK_PASS && ctx.selected_sk != NULL: use selected_sk as lookup result
|
|
* SK_PASS && ctx.selected_sk == NULL: continue to htable-based socket lookup
|
|
* SK_DROP : terminate lookup with -ECONNREFUSED
|
|
*
|
|
* This macro aggregates return values and selected sockets from
|
|
* multiple BPF programs according to following rules in order:
|
|
*
|
|
* 1. If any program returned SK_PASS and a non-NULL ctx.selected_sk,
|
|
* macro result is SK_PASS and last ctx.selected_sk is used.
|
|
* 2. If any program returned SK_DROP return value,
|
|
* macro result is SK_DROP.
|
|
* 3. Otherwise result is SK_PASS and ctx.selected_sk is NULL.
|
|
*
|
|
* Caller must ensure that the prog array is non-NULL, and that the
|
|
* array as well as the programs it contains remain valid.
|
|
*/
|
|
#define BPF_PROG_SK_LOOKUP_RUN_ARRAY(array, ctx, func) \
|
|
({ \
|
|
struct bpf_sk_lookup_kern *_ctx = &(ctx); \
|
|
struct bpf_prog_array_item *_item; \
|
|
struct sock *_selected_sk = NULL; \
|
|
bool _no_reuseport = false; \
|
|
struct bpf_prog *_prog; \
|
|
bool _all_pass = true; \
|
|
u32 _ret; \
|
|
\
|
|
migrate_disable(); \
|
|
_item = &(array)->items[0]; \
|
|
while ((_prog = READ_ONCE(_item->prog))) { \
|
|
/* restore most recent selection */ \
|
|
_ctx->selected_sk = _selected_sk; \
|
|
_ctx->no_reuseport = _no_reuseport; \
|
|
\
|
|
_ret = func(_prog, _ctx); \
|
|
if (_ret == SK_PASS && _ctx->selected_sk) { \
|
|
/* remember last non-NULL socket */ \
|
|
_selected_sk = _ctx->selected_sk; \
|
|
_no_reuseport = _ctx->no_reuseport; \
|
|
} else if (_ret == SK_DROP && _all_pass) { \
|
|
_all_pass = false; \
|
|
} \
|
|
_item++; \
|
|
} \
|
|
_ctx->selected_sk = _selected_sk; \
|
|
_ctx->no_reuseport = _no_reuseport; \
|
|
migrate_enable(); \
|
|
_all_pass || _selected_sk ? SK_PASS : SK_DROP; \
|
|
})
|
|
|
|
static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol,
|
|
const __be32 saddr, const __be16 sport,
|
|
const __be32 daddr, const u16 dport,
|
|
const int ifindex, struct sock **psk)
|
|
{
|
|
struct bpf_prog_array *run_array;
|
|
struct sock *selected_sk = NULL;
|
|
bool no_reuseport = false;
|
|
|
|
rcu_read_lock();
|
|
run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
|
|
if (run_array) {
|
|
struct bpf_sk_lookup_kern ctx = {
|
|
.family = AF_INET,
|
|
.protocol = protocol,
|
|
.v4.saddr = saddr,
|
|
.v4.daddr = daddr,
|
|
.sport = sport,
|
|
.dport = dport,
|
|
.ingress_ifindex = ifindex,
|
|
};
|
|
u32 act;
|
|
|
|
act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run);
|
|
if (act == SK_PASS) {
|
|
selected_sk = ctx.selected_sk;
|
|
no_reuseport = ctx.no_reuseport;
|
|
} else {
|
|
selected_sk = ERR_PTR(-ECONNREFUSED);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
*psk = selected_sk;
|
|
return no_reuseport;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
|
|
const struct in6_addr *saddr,
|
|
const __be16 sport,
|
|
const struct in6_addr *daddr,
|
|
const u16 dport,
|
|
const int ifindex, struct sock **psk)
|
|
{
|
|
struct bpf_prog_array *run_array;
|
|
struct sock *selected_sk = NULL;
|
|
bool no_reuseport = false;
|
|
|
|
rcu_read_lock();
|
|
run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
|
|
if (run_array) {
|
|
struct bpf_sk_lookup_kern ctx = {
|
|
.family = AF_INET6,
|
|
.protocol = protocol,
|
|
.v6.saddr = saddr,
|
|
.v6.daddr = daddr,
|
|
.sport = sport,
|
|
.dport = dport,
|
|
.ingress_ifindex = ifindex,
|
|
};
|
|
u32 act;
|
|
|
|
act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run);
|
|
if (act == SK_PASS) {
|
|
selected_sk = ctx.selected_sk;
|
|
no_reuseport = ctx.no_reuseport;
|
|
} else {
|
|
selected_sk = ERR_PTR(-ECONNREFUSED);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
*psk = selected_sk;
|
|
return no_reuseport;
|
|
}
|
|
#endif /* IS_ENABLED(CONFIG_IPV6) */
|
|
|
|
static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifindex,
|
|
u64 flags, const u64 flag_mask,
|
|
void *lookup_elem(struct bpf_map *map, u32 key))
|
|
{
|
|
struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
|
|
const u64 action_mask = XDP_ABORTED | XDP_DROP | XDP_PASS | XDP_TX;
|
|
|
|
/* Lower bits of the flags are used as return code on lookup failure */
|
|
if (unlikely(flags & ~(action_mask | flag_mask)))
|
|
return XDP_ABORTED;
|
|
|
|
ri->tgt_value = lookup_elem(map, ifindex);
|
|
if (unlikely(!ri->tgt_value) && !(flags & BPF_F_BROADCAST)) {
|
|
/* If the lookup fails we want to clear out the state in the
|
|
* redirect_info struct completely, so that if an eBPF program
|
|
* performs multiple lookups, the last one always takes
|
|
* precedence.
|
|
*/
|
|
ri->map_id = INT_MAX; /* Valid map id idr range: [1,INT_MAX[ */
|
|
ri->map_type = BPF_MAP_TYPE_UNSPEC;
|
|
return flags & action_mask;
|
|
}
|
|
|
|
ri->tgt_index = ifindex;
|
|
ri->map_id = map->id;
|
|
ri->map_type = map->map_type;
|
|
|
|
if (flags & BPF_F_BROADCAST) {
|
|
WRITE_ONCE(ri->map, map);
|
|
ri->flags = flags;
|
|
} else {
|
|
WRITE_ONCE(ri->map, NULL);
|
|
ri->flags = 0;
|
|
}
|
|
|
|
return XDP_REDIRECT;
|
|
}
|
|
|
|
#endif /* __LINUX_FILTER_H__ */
|