| /* |
| * Linux Socket Filter Data Structures |
| */ |
| #ifndef __LINUX_FILTER_H__ |
| #define __LINUX_FILTER_H__ |
| |
| #include <linux/atomic.h> |
| #include <linux/compat.h> |
| #include <uapi/linux/filter.h> |
| |
| #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 sk_buff; |
| struct sock; |
| |
| struct sk_filter |
| { |
| atomic_t refcnt; |
| unsigned int len; /* Number of filter blocks */ |
| unsigned int (*bpf_func)(const struct sk_buff *skb, |
| const struct sock_filter *filter); |
| struct rcu_head rcu; |
| struct sock_filter insns[0]; |
| }; |
| |
| static inline unsigned int sk_filter_len(const struct sk_filter *fp) |
| { |
| return fp->len * sizeof(struct sock_filter) + sizeof(*fp); |
| } |
| |
| extern int sk_filter(struct sock *sk, struct sk_buff *skb); |
| extern unsigned int sk_run_filter(const struct sk_buff *skb, |
| const struct sock_filter *filter); |
| extern int sk_unattached_filter_create(struct sk_filter **pfp, |
| struct sock_fprog *fprog); |
| extern void sk_unattached_filter_destroy(struct sk_filter *fp); |
| extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
| extern int sk_detach_filter(struct sock *sk); |
| extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen); |
| extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len); |
| extern void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to); |
| |
| #ifdef CONFIG_BPF_JIT |
| #include <stdarg.h> |
| #include <linux/linkage.h> |
| #include <linux/printk.h> |
| |
| extern void bpf_jit_compile(struct sk_filter *fp); |
| extern 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); |
| } |
| #define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns) |
| #else |
| static inline void bpf_jit_compile(struct sk_filter *fp) |
| { |
| } |
| static inline void bpf_jit_free(struct sk_filter *fp) |
| { |
| } |
| #define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns) |
| #endif |
| |
| 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_SECCOMP_LD_W, |
| BPF_S_ANC_VLAN_TAG, |
| BPF_S_ANC_VLAN_TAG_PRESENT, |
| BPF_S_ANC_PAY_OFFSET, |
| }; |
| |
| #endif /* __LINUX_FILTER_H__ */ |