| /* |
| * Linux Socket Filter Data Structures |
| */ |
| #ifndef __LINUX_FILTER_H__ |
| #define __LINUX_FILTER_H__ |
| |
| #include <linux/atomic.h> |
| #include <linux/compat.h> |
| #include <linux/workqueue.h> |
| #include <uapi/linux/filter.h> |
| |
| /* Internally used and optimized filter representation with extended |
| * instruction set based on top of classic BPF. |
| */ |
| |
| /* instruction classes */ |
| #define BPF_ALU64 0x07 /* alu mode in double word width */ |
| |
| /* ld/ldx fields */ |
| #define BPF_DW 0x18 /* double word */ |
| #define BPF_XADD 0xc0 /* exclusive add */ |
| |
| /* alu/jmp fields */ |
| #define BPF_MOV 0xb0 /* mov reg to reg */ |
| #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */ |
| |
| /* change endianness of a register */ |
| #define BPF_END 0xd0 /* flags for endianness conversion: */ |
| #define BPF_TO_LE 0x00 /* convert to little-endian */ |
| #define BPF_TO_BE 0x08 /* convert to big-endian */ |
| #define BPF_FROM_LE BPF_TO_LE |
| #define BPF_FROM_BE BPF_TO_BE |
| |
| #define BPF_JNE 0x50 /* jump != */ |
| #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ |
| #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ |
| #define BPF_CALL 0x80 /* function call */ |
| #define BPF_EXIT 0x90 /* function return */ |
| |
| /* Register numbers */ |
| enum { |
| BPF_REG_0 = 0, |
| BPF_REG_1, |
| BPF_REG_2, |
| BPF_REG_3, |
| BPF_REG_4, |
| BPF_REG_5, |
| BPF_REG_6, |
| BPF_REG_7, |
| BPF_REG_8, |
| BPF_REG_9, |
| BPF_REG_10, |
| __MAX_BPF_REG, |
| }; |
| |
| /* BPF has 10 general purpose 64-bit registers and stack frame. */ |
| #define MAX_BPF_REG __MAX_BPF_REG |
| |
| /* 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 |
| |
| /* bpf_add|sub|...: a += x, bpf_mov: a = x */ |
| #define BPF_ALU64_REG(op, a, x) \ |
| ((struct sock_filter_int) {BPF_ALU64|BPF_OP(op)|BPF_X, a, x, 0, 0}) |
| #define BPF_ALU32_REG(op, a, x) \ |
| ((struct sock_filter_int) {BPF_ALU|BPF_OP(op)|BPF_X, a, x, 0, 0}) |
| |
| /* bpf_add|sub|...: a += imm, bpf_mov: a = imm */ |
| #define BPF_ALU64_IMM(op, a, imm) \ |
| ((struct sock_filter_int) {BPF_ALU64|BPF_OP(op)|BPF_K, a, 0, 0, imm}) |
| #define BPF_ALU32_IMM(op, a, imm) \ |
| ((struct sock_filter_int) {BPF_ALU|BPF_OP(op)|BPF_K, a, 0, 0, imm}) |
| |
| /* R0 = *(uint *) (skb->data + off) */ |
| #define BPF_LD_ABS(size, off) \ |
| ((struct sock_filter_int) {BPF_LD|BPF_SIZE(size)|BPF_ABS, 0, 0, 0, off}) |
| |
| /* R0 = *(uint *) (skb->data + x + off) */ |
| #define BPF_LD_IND(size, x, off) \ |
| ((struct sock_filter_int) {BPF_LD|BPF_SIZE(size)|BPF_IND, 0, x, 0, off}) |
| |
| /* a = *(uint *) (x + off) */ |
| #define BPF_LDX_MEM(sz, a, x, off) \ |
| ((struct sock_filter_int) {BPF_LDX|BPF_SIZE(sz)|BPF_MEM, a, x, off, 0}) |
| |
| /* if (a 'op' x) goto pc+off */ |
| #define BPF_JMP_REG(op, a, x, off) \ |
| ((struct sock_filter_int) {BPF_JMP|BPF_OP(op)|BPF_X, a, x, off, 0}) |
| |
| /* if (a 'op' imm) goto pc+off */ |
| #define BPF_JMP_IMM(op, a, imm, off) \ |
| ((struct sock_filter_int) {BPF_JMP|BPF_OP(op)|BPF_K, a, 0, off, imm}) |
| |
| #define BPF_EXIT_INSN() \ |
| ((struct sock_filter_int) {BPF_JMP|BPF_EXIT, 0, 0, 0, 0}) |
| |
| static inline int size_to_bpf(int size) |
| { |
| switch (size) { |
| case 1: |
| return BPF_B; |
| case 2: |
| return BPF_H; |
| case 4: |
| return BPF_W; |
| case 8: |
| return BPF_DW; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /* Macro to invoke filter function. */ |
| #define SK_RUN_FILTER(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi) |
| |
| struct sock_filter_int { |
| __u8 code; /* opcode */ |
| __u8 a_reg:4; /* dest register */ |
| __u8 x_reg:4; /* source register */ |
| __s16 off; /* signed offset */ |
| __s32 imm; /* signed immediate constant */ |
| }; |
| |
| #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 sk_buff; |
| struct sock; |
| struct seccomp_data; |
| |
| struct sk_filter { |
| atomic_t refcnt; |
| u32 jited:1, /* Is our filter JIT'ed? */ |
| len:31; /* Number of filter blocks */ |
| struct sock_fprog_kern *orig_prog; /* Original BPF program */ |
| struct rcu_head rcu; |
| unsigned int (*bpf_func)(const struct sk_buff *skb, |
| const struct sock_filter_int *filter); |
| union { |
| struct sock_filter insns[0]; |
| struct sock_filter_int insnsi[0]; |
| struct work_struct work; |
| }; |
| }; |
| |
| static inline unsigned int sk_filter_size(unsigned int proglen) |
| { |
| return max(sizeof(struct sk_filter), |
| offsetof(struct sk_filter, insns[proglen])); |
| } |
| |
| #define sk_filter_proglen(fprog) \ |
| (fprog->len * sizeof(fprog->filter[0])) |
| |
| int sk_filter(struct sock *sk, struct sk_buff *skb); |
| |
| void sk_filter_select_runtime(struct sk_filter *fp); |
| void sk_filter_free(struct sk_filter *fp); |
| |
| int sk_convert_filter(struct sock_filter *prog, int len, |
| struct sock_filter_int *new_prog, int *new_len); |
| |
| int sk_unattached_filter_create(struct sk_filter **pfp, |
| struct sock_fprog *fprog); |
| void sk_unattached_filter_destroy(struct sk_filter *fp); |
| |
| int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
| int sk_detach_filter(struct sock *sk); |
| |
| int sk_chk_filter(struct sock_filter *filter, unsigned int flen); |
| int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, |
| unsigned int len); |
| void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to); |
| |
| void 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 sk_filter *fp); |
| |
| #ifdef CONFIG_BPF_JIT |
| #include <stdarg.h> |
| #include <linux/linkage.h> |
| #include <linux/printk.h> |
| |
| void bpf_jit_compile(struct sk_filter *fp); |
| void bpf_jit_free(struct sk_filter *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\n", |
| flen, proglen, pass, image); |
| if (image) |
| print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, |
| 16, 1, image, proglen, false); |
| } |
| #else |
| #include <linux/slab.h> |
| static inline void bpf_jit_compile(struct sk_filter *fp) |
| { |
| } |
| static inline void bpf_jit_free(struct sk_filter *fp) |
| { |
| kfree(fp); |
| } |
| #endif |
| |
| static inline int bpf_tell_extensions(void) |
| { |
| return SKF_AD_MAX; |
| } |
| |
| enum { |
| BPF_S_RET_K = 1, |
| BPF_S_RET_A, |
| BPF_S_ALU_ADD_K, |
| BPF_S_ALU_ADD_X, |
| BPF_S_ALU_SUB_K, |
| BPF_S_ALU_SUB_X, |
| BPF_S_ALU_MUL_K, |
| BPF_S_ALU_MUL_X, |
| BPF_S_ALU_DIV_X, |
| BPF_S_ALU_MOD_K, |
| BPF_S_ALU_MOD_X, |
| BPF_S_ALU_AND_K, |
| BPF_S_ALU_AND_X, |
| BPF_S_ALU_OR_K, |
| BPF_S_ALU_OR_X, |
| BPF_S_ALU_XOR_K, |
| BPF_S_ALU_XOR_X, |
| BPF_S_ALU_LSH_K, |
| BPF_S_ALU_LSH_X, |
| BPF_S_ALU_RSH_K, |
| BPF_S_ALU_RSH_X, |
| BPF_S_ALU_NEG, |
| BPF_S_LD_W_ABS, |
| BPF_S_LD_H_ABS, |
| BPF_S_LD_B_ABS, |
| BPF_S_LD_W_LEN, |
| BPF_S_LD_W_IND, |
| BPF_S_LD_H_IND, |
| BPF_S_LD_B_IND, |
| BPF_S_LD_IMM, |
| BPF_S_LDX_W_LEN, |
| BPF_S_LDX_B_MSH, |
| BPF_S_LDX_IMM, |
| BPF_S_MISC_TAX, |
| BPF_S_MISC_TXA, |
| BPF_S_ALU_DIV_K, |
| BPF_S_LD_MEM, |
| BPF_S_LDX_MEM, |
| BPF_S_ST, |
| BPF_S_STX, |
| BPF_S_JMP_JA, |
| BPF_S_JMP_JEQ_K, |
| BPF_S_JMP_JEQ_X, |
| BPF_S_JMP_JGE_K, |
| BPF_S_JMP_JGE_X, |
| BPF_S_JMP_JGT_K, |
| BPF_S_JMP_JGT_X, |
| BPF_S_JMP_JSET_K, |
| BPF_S_JMP_JSET_X, |
| /* Ancillary data */ |
| BPF_S_ANC_PROTOCOL, |
| BPF_S_ANC_PKTTYPE, |
| BPF_S_ANC_IFINDEX, |
| BPF_S_ANC_NLATTR, |
| BPF_S_ANC_NLATTR_NEST, |
| BPF_S_ANC_MARK, |
| BPF_S_ANC_QUEUE, |
| BPF_S_ANC_HATYPE, |
| BPF_S_ANC_RXHASH, |
| BPF_S_ANC_CPU, |
| BPF_S_ANC_ALU_XOR_X, |
| BPF_S_ANC_VLAN_TAG, |
| BPF_S_ANC_VLAN_TAG_PRESENT, |
| BPF_S_ANC_PAY_OFFSET, |
| BPF_S_ANC_RANDOM, |
| }; |
| |
| #endif /* __LINUX_FILTER_H__ */ |