Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux Socket Filter Data Structures | |
3 | */ | |
1da177e4 LT |
4 | #ifndef __LINUX_FILTER_H__ |
5 | #define __LINUX_FILTER_H__ | |
6 | ||
60063497 | 7 | #include <linux/atomic.h> |
0c5fe1b4 | 8 | #include <linux/compat.h> |
d45ed4a4 | 9 | #include <linux/workqueue.h> |
607ca46e | 10 | #include <uapi/linux/filter.h> |
792d4b5c | 11 | |
bd4cf0ed AS |
12 | /* Internally used and optimized filter representation with extended |
13 | * instruction set based on top of classic BPF. | |
0c5fe1b4 | 14 | */ |
bd4cf0ed AS |
15 | |
16 | /* instruction classes */ | |
17 | #define BPF_ALU64 0x07 /* alu mode in double word width */ | |
18 | ||
19 | /* ld/ldx fields */ | |
20 | #define BPF_DW 0x18 /* double word */ | |
21 | #define BPF_XADD 0xc0 /* exclusive add */ | |
22 | ||
23 | /* alu/jmp fields */ | |
24 | #define BPF_MOV 0xb0 /* mov reg to reg */ | |
25 | #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */ | |
26 | ||
27 | /* change endianness of a register */ | |
28 | #define BPF_END 0xd0 /* flags for endianness conversion: */ | |
29 | #define BPF_TO_LE 0x00 /* convert to little-endian */ | |
30 | #define BPF_TO_BE 0x08 /* convert to big-endian */ | |
31 | #define BPF_FROM_LE BPF_TO_LE | |
32 | #define BPF_FROM_BE BPF_TO_BE | |
33 | ||
34 | #define BPF_JNE 0x50 /* jump != */ | |
35 | #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ | |
36 | #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ | |
37 | #define BPF_CALL 0x80 /* function call */ | |
38 | #define BPF_EXIT 0x90 /* function return */ | |
39 | ||
40 | /* BPF has 10 general purpose 64-bit registers and stack frame. */ | |
41 | #define MAX_BPF_REG 11 | |
42 | ||
43 | /* BPF program can access up to 512 bytes of stack space. */ | |
44 | #define MAX_BPF_STACK 512 | |
45 | ||
46 | /* Arg1, context and stack frame pointer register positions. */ | |
47 | #define ARG1_REG 1 | |
48 | #define CTX_REG 6 | |
49 | #define FP_REG 10 | |
50 | ||
51 | struct sock_filter_int { | |
52 | __u8 code; /* opcode */ | |
53 | __u8 a_reg:4; /* dest register */ | |
54 | __u8 x_reg:4; /* source register */ | |
55 | __s16 off; /* signed offset */ | |
56 | __s32 imm; /* signed immediate constant */ | |
57 | }; | |
58 | ||
59 | #ifdef CONFIG_COMPAT | |
60 | /* A struct sock_filter is architecture independent. */ | |
0c5fe1b4 WD |
61 | struct compat_sock_fprog { |
62 | u16 len; | |
bd4cf0ed | 63 | compat_uptr_t filter; /* struct sock_filter * */ |
0c5fe1b4 WD |
64 | }; |
65 | #endif | |
66 | ||
a3ea269b DB |
67 | struct sock_fprog_kern { |
68 | u16 len; | |
69 | struct sock_filter *filter; | |
70 | }; | |
71 | ||
792d4b5c HC |
72 | struct sk_buff; |
73 | struct sock; | |
bd4cf0ed | 74 | struct seccomp_data; |
792d4b5c | 75 | |
a3ea269b | 76 | struct sk_filter { |
b715631f | 77 | atomic_t refcnt; |
f8bbbfc3 DB |
78 | u32 jited:1, /* Is our filter JIT'ed? */ |
79 | len:31; /* Number of filter blocks */ | |
a3ea269b | 80 | struct sock_fprog_kern *orig_prog; /* Original BPF program */ |
d45ed4a4 | 81 | struct rcu_head rcu; |
0a14842f | 82 | unsigned int (*bpf_func)(const struct sk_buff *skb, |
bd4cf0ed | 83 | const struct sock_filter_int *filter); |
d45ed4a4 | 84 | union { |
bd4cf0ed AS |
85 | struct sock_filter insns[0]; |
86 | struct sock_filter_int insnsi[0]; | |
d45ed4a4 AS |
87 | struct work_struct work; |
88 | }; | |
b715631f SH |
89 | }; |
90 | ||
d45ed4a4 | 91 | static inline unsigned int sk_filter_size(unsigned int proglen) |
b715631f | 92 | { |
d45ed4a4 AS |
93 | return max(sizeof(struct sk_filter), |
94 | offsetof(struct sk_filter, insns[proglen])); | |
b715631f SH |
95 | } |
96 | ||
a3ea269b DB |
97 | #define sk_filter_proglen(fprog) \ |
98 | (fprog->len * sizeof(fprog->filter[0])) | |
99 | ||
bd4cf0ed AS |
100 | #define SK_RUN_FILTER(filter, ctx) \ |
101 | (*filter->bpf_func)(ctx, filter->insnsi) | |
102 | ||
fbc907f0 | 103 | int sk_filter(struct sock *sk, struct sk_buff *skb); |
bd4cf0ed AS |
104 | |
105 | u32 sk_run_filter_int_seccomp(const struct seccomp_data *ctx, | |
106 | const struct sock_filter_int *insni); | |
107 | u32 sk_run_filter_int_skb(const struct sk_buff *ctx, | |
108 | const struct sock_filter_int *insni); | |
109 | ||
110 | int sk_convert_filter(struct sock_filter *prog, int len, | |
111 | struct sock_filter_int *new_prog, int *new_len); | |
a3ea269b | 112 | |
fbc907f0 DB |
113 | int sk_unattached_filter_create(struct sk_filter **pfp, |
114 | struct sock_fprog *fprog); | |
115 | void sk_unattached_filter_destroy(struct sk_filter *fp); | |
a3ea269b | 116 | |
fbc907f0 DB |
117 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); |
118 | int sk_detach_filter(struct sock *sk); | |
a3ea269b | 119 | |
fbc907f0 DB |
120 | int sk_chk_filter(struct sock_filter *filter, unsigned int flen); |
121 | int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, | |
122 | unsigned int len); | |
123 | void sk_decode_filter(struct sock_filter *filt, struct sock_filter *to); | |
124 | ||
125 | void sk_filter_charge(struct sock *sk, struct sk_filter *fp); | |
126 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); | |
0a14842f ED |
127 | |
128 | #ifdef CONFIG_BPF_JIT | |
20074f35 | 129 | #include <stdarg.h> |
a691ce7f CG |
130 | #include <linux/linkage.h> |
131 | #include <linux/printk.h> | |
132 | ||
fbc907f0 DB |
133 | void bpf_jit_compile(struct sk_filter *fp); |
134 | void bpf_jit_free(struct sk_filter *fp); | |
79617801 DB |
135 | |
136 | static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, | |
137 | u32 pass, void *image) | |
138 | { | |
16495445 | 139 | pr_err("flen=%u proglen=%u pass=%u image=%pK\n", |
79617801 DB |
140 | flen, proglen, pass, image); |
141 | if (image) | |
16495445 | 142 | print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, |
79617801 DB |
143 | 16, 1, image, proglen, false); |
144 | } | |
0a14842f | 145 | #else |
d45ed4a4 | 146 | #include <linux/slab.h> |
0a14842f ED |
147 | static inline void bpf_jit_compile(struct sk_filter *fp) |
148 | { | |
149 | } | |
150 | static inline void bpf_jit_free(struct sk_filter *fp) | |
151 | { | |
d45ed4a4 | 152 | kfree(fp); |
0a14842f | 153 | } |
0a14842f ED |
154 | #endif |
155 | ||
ea02f941 MS |
156 | static inline int bpf_tell_extensions(void) |
157 | { | |
37692299 | 158 | return SKF_AD_MAX; |
ea02f941 MS |
159 | } |
160 | ||
0a14842f ED |
161 | enum { |
162 | BPF_S_RET_K = 1, | |
163 | BPF_S_RET_A, | |
164 | BPF_S_ALU_ADD_K, | |
165 | BPF_S_ALU_ADD_X, | |
166 | BPF_S_ALU_SUB_K, | |
167 | BPF_S_ALU_SUB_X, | |
168 | BPF_S_ALU_MUL_K, | |
169 | BPF_S_ALU_MUL_X, | |
170 | BPF_S_ALU_DIV_X, | |
b6069a95 ED |
171 | BPF_S_ALU_MOD_K, |
172 | BPF_S_ALU_MOD_X, | |
0a14842f ED |
173 | BPF_S_ALU_AND_K, |
174 | BPF_S_ALU_AND_X, | |
175 | BPF_S_ALU_OR_K, | |
176 | BPF_S_ALU_OR_X, | |
9e49e889 DB |
177 | BPF_S_ALU_XOR_K, |
178 | BPF_S_ALU_XOR_X, | |
0a14842f ED |
179 | BPF_S_ALU_LSH_K, |
180 | BPF_S_ALU_LSH_X, | |
181 | BPF_S_ALU_RSH_K, | |
182 | BPF_S_ALU_RSH_X, | |
183 | BPF_S_ALU_NEG, | |
184 | BPF_S_LD_W_ABS, | |
185 | BPF_S_LD_H_ABS, | |
186 | BPF_S_LD_B_ABS, | |
187 | BPF_S_LD_W_LEN, | |
188 | BPF_S_LD_W_IND, | |
189 | BPF_S_LD_H_IND, | |
190 | BPF_S_LD_B_IND, | |
191 | BPF_S_LD_IMM, | |
192 | BPF_S_LDX_W_LEN, | |
193 | BPF_S_LDX_B_MSH, | |
194 | BPF_S_LDX_IMM, | |
195 | BPF_S_MISC_TAX, | |
196 | BPF_S_MISC_TXA, | |
197 | BPF_S_ALU_DIV_K, | |
198 | BPF_S_LD_MEM, | |
199 | BPF_S_LDX_MEM, | |
200 | BPF_S_ST, | |
201 | BPF_S_STX, | |
202 | BPF_S_JMP_JA, | |
203 | BPF_S_JMP_JEQ_K, | |
204 | BPF_S_JMP_JEQ_X, | |
205 | BPF_S_JMP_JGE_K, | |
206 | BPF_S_JMP_JGE_X, | |
207 | BPF_S_JMP_JGT_K, | |
208 | BPF_S_JMP_JGT_X, | |
209 | BPF_S_JMP_JSET_K, | |
210 | BPF_S_JMP_JSET_X, | |
211 | /* Ancillary data */ | |
212 | BPF_S_ANC_PROTOCOL, | |
213 | BPF_S_ANC_PKTTYPE, | |
214 | BPF_S_ANC_IFINDEX, | |
215 | BPF_S_ANC_NLATTR, | |
216 | BPF_S_ANC_NLATTR_NEST, | |
217 | BPF_S_ANC_MARK, | |
218 | BPF_S_ANC_QUEUE, | |
219 | BPF_S_ANC_HATYPE, | |
220 | BPF_S_ANC_RXHASH, | |
221 | BPF_S_ANC_CPU, | |
ffe06c17 | 222 | BPF_S_ANC_ALU_XOR_X, |
f3335031 ED |
223 | BPF_S_ANC_VLAN_TAG, |
224 | BPF_S_ANC_VLAN_TAG_PRESENT, | |
3e5289d5 | 225 | BPF_S_ANC_PAY_OFFSET, |
0a14842f ED |
226 | }; |
227 | ||
1da177e4 | 228 | #endif /* __LINUX_FILTER_H__ */ |