Commit | Line | Data |
---|---|---|
c10302ef MS |
1 | /* |
2 | * BPF Jit compiler for s390. | |
3 | * | |
4 | * Copyright IBM Corp. 2012 | |
5 | * | |
6 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | */ | |
8 | #include <linux/moduleloader.h> | |
9 | #include <linux/netdevice.h> | |
5303a0fe | 10 | #include <linux/if_vlan.h> |
c10302ef | 11 | #include <linux/filter.h> |
aa2d2c73 | 12 | #include <linux/random.h> |
c9a7afa3 | 13 | #include <linux/init.h> |
c10302ef | 14 | #include <asm/cacheflush.h> |
68d9884d | 15 | #include <asm/facility.h> |
0f20822a | 16 | #include <asm/dis.h> |
c10302ef MS |
17 | |
18 | /* | |
19 | * Conventions: | |
20 | * %r2 = skb pointer | |
21 | * %r3 = offset parameter | |
22 | * %r4 = scratch register / length parameter | |
23 | * %r5 = BPF A accumulator | |
24 | * %r8 = return address | |
25 | * %r9 = save register for skb pointer | |
26 | * %r10 = skb->data | |
27 | * %r11 = skb->len - skb->data_len (headlen) | |
28 | * %r12 = BPF X accumulator | |
29 | * %r13 = literal pool pointer | |
30 | * 0(%r15) - 63(%r15) scratch memory array with BPF_MEMWORDS | |
31 | */ | |
32 | int bpf_jit_enable __read_mostly; | |
33 | ||
34 | /* | |
35 | * assembly code in arch/x86/net/bpf_jit.S | |
36 | */ | |
37 | extern u8 sk_load_word[], sk_load_half[], sk_load_byte[], sk_load_byte_msh[]; | |
38 | extern u8 sk_load_word_ind[], sk_load_half_ind[], sk_load_byte_ind[]; | |
39 | ||
40 | struct bpf_jit { | |
41 | unsigned int seen; | |
42 | u8 *start; | |
43 | u8 *prg; | |
44 | u8 *mid; | |
45 | u8 *lit; | |
46 | u8 *end; | |
47 | u8 *base_ip; | |
48 | u8 *ret0_ip; | |
49 | u8 *exit_ip; | |
50 | unsigned int off_load_word; | |
51 | unsigned int off_load_half; | |
52 | unsigned int off_load_byte; | |
53 | unsigned int off_load_bmsh; | |
54 | unsigned int off_load_iword; | |
55 | unsigned int off_load_ihalf; | |
56 | unsigned int off_load_ibyte; | |
57 | }; | |
58 | ||
59 | #define BPF_SIZE_MAX 4096 /* Max size for program */ | |
60 | ||
61 | #define SEEN_DATAREF 1 /* might call external helpers */ | |
62 | #define SEEN_XREG 2 /* ebx is used */ | |
63 | #define SEEN_MEM 4 /* use mem[] for temporary storage */ | |
64 | #define SEEN_RET0 8 /* pc_ret0 points to a valid return 0 */ | |
65 | #define SEEN_LITERAL 16 /* code uses literals */ | |
66 | #define SEEN_LOAD_WORD 32 /* code uses sk_load_word */ | |
67 | #define SEEN_LOAD_HALF 64 /* code uses sk_load_half */ | |
68 | #define SEEN_LOAD_BYTE 128 /* code uses sk_load_byte */ | |
69 | #define SEEN_LOAD_BMSH 256 /* code uses sk_load_byte_msh */ | |
70 | #define SEEN_LOAD_IWORD 512 /* code uses sk_load_word_ind */ | |
71 | #define SEEN_LOAD_IHALF 1024 /* code uses sk_load_half_ind */ | |
72 | #define SEEN_LOAD_IBYTE 2048 /* code uses sk_load_byte_ind */ | |
73 | ||
74 | #define EMIT2(op) \ | |
75 | ({ \ | |
76 | if (jit->prg + 2 <= jit->mid) \ | |
77 | *(u16 *) jit->prg = op; \ | |
78 | jit->prg += 2; \ | |
79 | }) | |
80 | ||
81 | #define EMIT4(op) \ | |
82 | ({ \ | |
83 | if (jit->prg + 4 <= jit->mid) \ | |
84 | *(u32 *) jit->prg = op; \ | |
85 | jit->prg += 4; \ | |
86 | }) | |
87 | ||
88 | #define EMIT4_DISP(op, disp) \ | |
89 | ({ \ | |
90 | unsigned int __disp = (disp) & 0xfff; \ | |
91 | EMIT4(op | __disp); \ | |
92 | }) | |
93 | ||
94 | #define EMIT4_IMM(op, imm) \ | |
95 | ({ \ | |
96 | unsigned int __imm = (imm) & 0xffff; \ | |
97 | EMIT4(op | __imm); \ | |
98 | }) | |
99 | ||
100 | #define EMIT4_PCREL(op, pcrel) \ | |
101 | ({ \ | |
102 | long __pcrel = ((pcrel) >> 1) & 0xffff; \ | |
103 | EMIT4(op | __pcrel); \ | |
104 | }) | |
105 | ||
106 | #define EMIT6(op1, op2) \ | |
107 | ({ \ | |
108 | if (jit->prg + 6 <= jit->mid) { \ | |
109 | *(u32 *) jit->prg = op1; \ | |
110 | *(u16 *) (jit->prg + 4) = op2; \ | |
111 | } \ | |
112 | jit->prg += 6; \ | |
113 | }) | |
114 | ||
115 | #define EMIT6_DISP(op1, op2, disp) \ | |
116 | ({ \ | |
117 | unsigned int __disp = (disp) & 0xfff; \ | |
118 | EMIT6(op1 | __disp, op2); \ | |
119 | }) | |
120 | ||
68d9884d HC |
121 | #define EMIT6_IMM(op, imm) \ |
122 | ({ \ | |
123 | unsigned int __imm = (imm); \ | |
124 | EMIT6(op | (__imm >> 16), __imm & 0xffff); \ | |
125 | }) | |
126 | ||
c10302ef MS |
127 | #define EMIT_CONST(val) \ |
128 | ({ \ | |
129 | unsigned int ret; \ | |
130 | ret = (unsigned int) (jit->lit - jit->base_ip); \ | |
131 | jit->seen |= SEEN_LITERAL; \ | |
132 | if (jit->lit + 4 <= jit->end) \ | |
133 | *(u32 *) jit->lit = val; \ | |
134 | jit->lit += 4; \ | |
135 | ret; \ | |
136 | }) | |
137 | ||
138 | #define EMIT_FN_CONST(bit, fn) \ | |
139 | ({ \ | |
140 | unsigned int ret; \ | |
141 | ret = (unsigned int) (jit->lit - jit->base_ip); \ | |
142 | if (jit->seen & bit) { \ | |
143 | jit->seen |= SEEN_LITERAL; \ | |
144 | if (jit->lit + 8 <= jit->end) \ | |
145 | *(void **) jit->lit = fn; \ | |
146 | jit->lit += 8; \ | |
147 | } \ | |
148 | ret; \ | |
149 | }) | |
150 | ||
151 | static void bpf_jit_prologue(struct bpf_jit *jit) | |
152 | { | |
153 | /* Save registers and create stack frame if necessary */ | |
154 | if (jit->seen & SEEN_DATAREF) { | |
155 | /* stmg %r8,%r15,88(%r15) */ | |
156 | EMIT6(0xeb8ff058, 0x0024); | |
157 | /* lgr %r14,%r15 */ | |
158 | EMIT4(0xb90400ef); | |
6cef3003 MS |
159 | /* aghi %r15,<offset> */ |
160 | EMIT4_IMM(0xa7fb0000, (jit->seen & SEEN_MEM) ? -112 : -80); | |
c10302ef MS |
161 | /* stg %r14,152(%r15) */ |
162 | EMIT6(0xe3e0f098, 0x0024); | |
163 | } else if ((jit->seen & SEEN_XREG) && (jit->seen & SEEN_LITERAL)) | |
164 | /* stmg %r12,%r13,120(%r15) */ | |
165 | EMIT6(0xebcdf078, 0x0024); | |
166 | else if (jit->seen & SEEN_XREG) | |
167 | /* stg %r12,120(%r15) */ | |
168 | EMIT6(0xe3c0f078, 0x0024); | |
169 | else if (jit->seen & SEEN_LITERAL) | |
170 | /* stg %r13,128(%r15) */ | |
171 | EMIT6(0xe3d0f080, 0x0024); | |
172 | ||
173 | /* Setup literal pool */ | |
174 | if (jit->seen & SEEN_LITERAL) { | |
175 | /* basr %r13,0 */ | |
176 | EMIT2(0x0dd0); | |
177 | jit->base_ip = jit->prg; | |
178 | } | |
179 | jit->off_load_word = EMIT_FN_CONST(SEEN_LOAD_WORD, sk_load_word); | |
180 | jit->off_load_half = EMIT_FN_CONST(SEEN_LOAD_HALF, sk_load_half); | |
181 | jit->off_load_byte = EMIT_FN_CONST(SEEN_LOAD_BYTE, sk_load_byte); | |
182 | jit->off_load_bmsh = EMIT_FN_CONST(SEEN_LOAD_BMSH, sk_load_byte_msh); | |
183 | jit->off_load_iword = EMIT_FN_CONST(SEEN_LOAD_IWORD, sk_load_word_ind); | |
184 | jit->off_load_ihalf = EMIT_FN_CONST(SEEN_LOAD_IHALF, sk_load_half_ind); | |
185 | jit->off_load_ibyte = EMIT_FN_CONST(SEEN_LOAD_IBYTE, sk_load_byte_ind); | |
186 | ||
187 | /* Filter needs to access skb data */ | |
188 | if (jit->seen & SEEN_DATAREF) { | |
189 | /* l %r11,<len>(%r2) */ | |
190 | EMIT4_DISP(0x58b02000, offsetof(struct sk_buff, len)); | |
191 | /* s %r11,<data_len>(%r2) */ | |
192 | EMIT4_DISP(0x5bb02000, offsetof(struct sk_buff, data_len)); | |
193 | /* lg %r10,<data>(%r2) */ | |
194 | EMIT6_DISP(0xe3a02000, 0x0004, | |
195 | offsetof(struct sk_buff, data)); | |
196 | } | |
197 | } | |
198 | ||
199 | static void bpf_jit_epilogue(struct bpf_jit *jit) | |
200 | { | |
201 | /* Return 0 */ | |
202 | if (jit->seen & SEEN_RET0) { | |
203 | jit->ret0_ip = jit->prg; | |
204 | /* lghi %r2,0 */ | |
205 | EMIT4(0xa7290000); | |
206 | } | |
207 | jit->exit_ip = jit->prg; | |
208 | /* Restore registers */ | |
209 | if (jit->seen & SEEN_DATAREF) | |
210 | /* lmg %r8,%r15,<offset>(%r15) */ | |
211 | EMIT6_DISP(0xeb8ff000, 0x0004, | |
212 | (jit->seen & SEEN_MEM) ? 200 : 168); | |
213 | else if ((jit->seen & SEEN_XREG) && (jit->seen & SEEN_LITERAL)) | |
214 | /* lmg %r12,%r13,120(%r15) */ | |
215 | EMIT6(0xebcdf078, 0x0004); | |
216 | else if (jit->seen & SEEN_XREG) | |
217 | /* lg %r12,120(%r15) */ | |
218 | EMIT6(0xe3c0f078, 0x0004); | |
219 | else if (jit->seen & SEEN_LITERAL) | |
220 | /* lg %r13,128(%r15) */ | |
221 | EMIT6(0xe3d0f080, 0x0004); | |
222 | /* br %r14 */ | |
223 | EMIT2(0x07fe); | |
224 | } | |
225 | ||
c9a7afa3 HC |
226 | /* Helper to find the offset of pkt_type in sk_buff |
227 | * Make sure its still a 3bit field starting at the MSBs within a byte. | |
228 | */ | |
229 | #define PKT_TYPE_MAX 0xe0 | |
230 | static int pkt_type_offset; | |
231 | ||
232 | static int __init bpf_pkt_type_offset_init(void) | |
233 | { | |
234 | struct sk_buff skb_probe = { | |
235 | .pkt_type = ~0, | |
236 | }; | |
237 | char *ct = (char *)&skb_probe; | |
238 | int off; | |
239 | ||
240 | pkt_type_offset = -1; | |
241 | for (off = 0; off < sizeof(struct sk_buff); off++) { | |
242 | if (!ct[off]) | |
243 | continue; | |
244 | if (ct[off] == PKT_TYPE_MAX) | |
245 | pkt_type_offset = off; | |
246 | else { | |
247 | /* Found non matching bit pattern, fix needed. */ | |
248 | WARN_ON_ONCE(1); | |
249 | pkt_type_offset = -1; | |
250 | return -1; | |
251 | } | |
252 | } | |
253 | return 0; | |
254 | } | |
255 | device_initcall(bpf_pkt_type_offset_init); | |
256 | ||
c10302ef MS |
257 | /* |
258 | * make sure we dont leak kernel information to user | |
259 | */ | |
260 | static void bpf_jit_noleaks(struct bpf_jit *jit, struct sock_filter *filter) | |
261 | { | |
262 | /* Clear temporary memory if (seen & SEEN_MEM) */ | |
263 | if (jit->seen & SEEN_MEM) | |
264 | /* xc 0(64,%r15),0(%r15) */ | |
265 | EMIT6(0xd73ff000, 0xf000); | |
266 | /* Clear X if (seen & SEEN_XREG) */ | |
267 | if (jit->seen & SEEN_XREG) | |
268 | /* lhi %r12,0 */ | |
269 | EMIT4(0xa7c80000); | |
270 | /* Clear A if the first register does not set it. */ | |
271 | switch (filter[0].code) { | |
34805931 DB |
272 | case BPF_LD | BPF_W | BPF_ABS: |
273 | case BPF_LD | BPF_H | BPF_ABS: | |
274 | case BPF_LD | BPF_B | BPF_ABS: | |
275 | case BPF_LD | BPF_W | BPF_LEN: | |
276 | case BPF_LD | BPF_W | BPF_IND: | |
277 | case BPF_LD | BPF_H | BPF_IND: | |
278 | case BPF_LD | BPF_B | BPF_IND: | |
279 | case BPF_LD | BPF_IMM: | |
280 | case BPF_LD | BPF_MEM: | |
281 | case BPF_MISC | BPF_TXA: | |
282 | case BPF_RET | BPF_K: | |
c10302ef MS |
283 | /* first instruction sets A register */ |
284 | break; | |
285 | default: /* A = 0 */ | |
286 | /* lhi %r5,0 */ | |
287 | EMIT4(0xa7580000); | |
288 | } | |
289 | } | |
290 | ||
291 | static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, | |
292 | unsigned int *addrs, int i, int last) | |
293 | { | |
294 | unsigned int K; | |
295 | int offset; | |
296 | unsigned int mask; | |
34805931 | 297 | u16 code; |
c10302ef MS |
298 | |
299 | K = filter->k; | |
34805931 DB |
300 | code = bpf_anc_helper(filter); |
301 | ||
302 | switch (code) { | |
303 | case BPF_ALU | BPF_ADD | BPF_X: /* A += X */ | |
c10302ef MS |
304 | jit->seen |= SEEN_XREG; |
305 | /* ar %r5,%r12 */ | |
306 | EMIT2(0x1a5c); | |
307 | break; | |
34805931 | 308 | case BPF_ALU | BPF_ADD | BPF_K: /* A += K */ |
c10302ef MS |
309 | if (!K) |
310 | break; | |
311 | if (K <= 16383) | |
312 | /* ahi %r5,<K> */ | |
313 | EMIT4_IMM(0xa75a0000, K); | |
68d9884d HC |
314 | else if (test_facility(21)) |
315 | /* alfi %r5,<K> */ | |
316 | EMIT6_IMM(0xc25b0000, K); | |
c10302ef MS |
317 | else |
318 | /* a %r5,<d(K)>(%r13) */ | |
319 | EMIT4_DISP(0x5a50d000, EMIT_CONST(K)); | |
320 | break; | |
34805931 | 321 | case BPF_ALU | BPF_SUB | BPF_X: /* A -= X */ |
c10302ef MS |
322 | jit->seen |= SEEN_XREG; |
323 | /* sr %r5,%r12 */ | |
324 | EMIT2(0x1b5c); | |
325 | break; | |
34805931 | 326 | case BPF_ALU | BPF_SUB | BPF_K: /* A -= K */ |
c10302ef MS |
327 | if (!K) |
328 | break; | |
329 | if (K <= 16384) | |
330 | /* ahi %r5,-K */ | |
331 | EMIT4_IMM(0xa75a0000, -K); | |
68d9884d HC |
332 | else if (test_facility(21)) |
333 | /* alfi %r5,-K */ | |
334 | EMIT6_IMM(0xc25b0000, -K); | |
c10302ef MS |
335 | else |
336 | /* s %r5,<d(K)>(%r13) */ | |
337 | EMIT4_DISP(0x5b50d000, EMIT_CONST(K)); | |
338 | break; | |
34805931 | 339 | case BPF_ALU | BPF_MUL | BPF_X: /* A *= X */ |
c10302ef MS |
340 | jit->seen |= SEEN_XREG; |
341 | /* msr %r5,%r12 */ | |
342 | EMIT4(0xb252005c); | |
343 | break; | |
34805931 | 344 | case BPF_ALU | BPF_MUL | BPF_K: /* A *= K */ |
c10302ef MS |
345 | if (K <= 16383) |
346 | /* mhi %r5,K */ | |
347 | EMIT4_IMM(0xa75c0000, K); | |
68d9884d HC |
348 | else if (test_facility(34)) |
349 | /* msfi %r5,<K> */ | |
350 | EMIT6_IMM(0xc2510000, K); | |
c10302ef MS |
351 | else |
352 | /* ms %r5,<d(K)>(%r13) */ | |
353 | EMIT4_DISP(0x7150d000, EMIT_CONST(K)); | |
354 | break; | |
34805931 | 355 | case BPF_ALU | BPF_DIV | BPF_X: /* A /= X */ |
c10302ef MS |
356 | jit->seen |= SEEN_XREG | SEEN_RET0; |
357 | /* ltr %r12,%r12 */ | |
358 | EMIT2(0x12cc); | |
359 | /* jz <ret0> */ | |
360 | EMIT4_PCREL(0xa7840000, (jit->ret0_ip - jit->prg)); | |
361 | /* lhi %r4,0 */ | |
362 | EMIT4(0xa7480000); | |
3af57f78 HC |
363 | /* dlr %r4,%r12 */ |
364 | EMIT4(0xb997004c); | |
c10302ef | 365 | break; |
34805931 | 366 | case BPF_ALU | BPF_DIV | BPF_K: /* A /= K */ |
aee636c4 ED |
367 | if (K == 1) |
368 | break; | |
369 | /* lhi %r4,0 */ | |
370 | EMIT4(0xa7480000); | |
3af57f78 HC |
371 | /* dl %r4,<d(K)>(%r13) */ |
372 | EMIT6_DISP(0xe340d000, 0x0097, EMIT_CONST(K)); | |
32472745 | 373 | break; |
34805931 | 374 | case BPF_ALU | BPF_MOD | BPF_X: /* A %= X */ |
32472745 HC |
375 | jit->seen |= SEEN_XREG | SEEN_RET0; |
376 | /* ltr %r12,%r12 */ | |
377 | EMIT2(0x12cc); | |
378 | /* jz <ret0> */ | |
379 | EMIT4_PCREL(0xa7840000, (jit->ret0_ip - jit->prg)); | |
380 | /* lhi %r4,0 */ | |
381 | EMIT4(0xa7480000); | |
3af57f78 HC |
382 | /* dlr %r4,%r12 */ |
383 | EMIT4(0xb997004c); | |
32472745 HC |
384 | /* lr %r5,%r4 */ |
385 | EMIT2(0x1854); | |
386 | break; | |
34805931 | 387 | case BPF_ALU | BPF_MOD | BPF_K: /* A %= K */ |
aee636c4 ED |
388 | if (K == 1) { |
389 | /* lhi %r5,0 */ | |
390 | EMIT4(0xa7580000); | |
391 | break; | |
392 | } | |
32472745 HC |
393 | /* lhi %r4,0 */ |
394 | EMIT4(0xa7480000); | |
3af57f78 HC |
395 | /* dl %r4,<d(K)>(%r13) */ |
396 | EMIT6_DISP(0xe340d000, 0x0097, EMIT_CONST(K)); | |
c10302ef MS |
397 | /* lr %r5,%r4 */ |
398 | EMIT2(0x1854); | |
399 | break; | |
34805931 | 400 | case BPF_ALU | BPF_AND | BPF_X: /* A &= X */ |
c10302ef MS |
401 | jit->seen |= SEEN_XREG; |
402 | /* nr %r5,%r12 */ | |
403 | EMIT2(0x145c); | |
404 | break; | |
34805931 | 405 | case BPF_ALU | BPF_AND | BPF_K: /* A &= K */ |
68d9884d HC |
406 | if (test_facility(21)) |
407 | /* nilf %r5,<K> */ | |
408 | EMIT6_IMM(0xc05b0000, K); | |
409 | else | |
410 | /* n %r5,<d(K)>(%r13) */ | |
411 | EMIT4_DISP(0x5450d000, EMIT_CONST(K)); | |
c10302ef | 412 | break; |
34805931 | 413 | case BPF_ALU | BPF_OR | BPF_X: /* A |= X */ |
c10302ef MS |
414 | jit->seen |= SEEN_XREG; |
415 | /* or %r5,%r12 */ | |
416 | EMIT2(0x165c); | |
417 | break; | |
34805931 | 418 | case BPF_ALU | BPF_OR | BPF_K: /* A |= K */ |
68d9884d HC |
419 | if (test_facility(21)) |
420 | /* oilf %r5,<K> */ | |
421 | EMIT6_IMM(0xc05d0000, K); | |
422 | else | |
423 | /* o %r5,<d(K)>(%r13) */ | |
424 | EMIT4_DISP(0x5650d000, EMIT_CONST(K)); | |
c10302ef | 425 | break; |
34805931 DB |
426 | case BPF_ANC | SKF_AD_ALU_XOR_X: /* A ^= X; */ |
427 | case BPF_ALU | BPF_XOR | BPF_X: | |
c59eed11 HC |
428 | jit->seen |= SEEN_XREG; |
429 | /* xr %r5,%r12 */ | |
430 | EMIT2(0x175c); | |
431 | break; | |
34805931 | 432 | case BPF_ALU | BPF_XOR | BPF_K: /* A ^= K */ |
916908df HC |
433 | if (!K) |
434 | break; | |
435 | /* x %r5,<d(K)>(%r13) */ | |
436 | EMIT4_DISP(0x5750d000, EMIT_CONST(K)); | |
437 | break; | |
34805931 | 438 | case BPF_ALU | BPF_LSH | BPF_X: /* A <<= X; */ |
c10302ef MS |
439 | jit->seen |= SEEN_XREG; |
440 | /* sll %r5,0(%r12) */ | |
441 | EMIT4(0x8950c000); | |
442 | break; | |
34805931 | 443 | case BPF_ALU | BPF_LSH | BPF_K: /* A <<= K */ |
c10302ef MS |
444 | if (K == 0) |
445 | break; | |
446 | /* sll %r5,K */ | |
447 | EMIT4_DISP(0x89500000, K); | |
448 | break; | |
34805931 | 449 | case BPF_ALU | BPF_RSH | BPF_X: /* A >>= X; */ |
c10302ef MS |
450 | jit->seen |= SEEN_XREG; |
451 | /* srl %r5,0(%r12) */ | |
452 | EMIT4(0x8850c000); | |
453 | break; | |
34805931 | 454 | case BPF_ALU | BPF_RSH | BPF_K: /* A >>= K; */ |
c10302ef MS |
455 | if (K == 0) |
456 | break; | |
457 | /* srl %r5,K */ | |
458 | EMIT4_DISP(0x88500000, K); | |
459 | break; | |
34805931 | 460 | case BPF_ALU | BPF_NEG: /* A = -A */ |
c10302ef MS |
461 | /* lnr %r5,%r5 */ |
462 | EMIT2(0x1155); | |
463 | break; | |
34805931 | 464 | case BPF_JMP | BPF_JA: /* ip += K */ |
c10302ef MS |
465 | offset = addrs[i + K] + jit->start - jit->prg; |
466 | EMIT4_PCREL(0xa7f40000, offset); | |
467 | break; | |
34805931 | 468 | case BPF_JMP | BPF_JGT | BPF_K: /* ip += (A > K) ? jt : jf */ |
c10302ef MS |
469 | mask = 0x200000; /* jh */ |
470 | goto kbranch; | |
34805931 | 471 | case BPF_JMP | BPF_JGE | BPF_K: /* ip += (A >= K) ? jt : jf */ |
c10302ef MS |
472 | mask = 0xa00000; /* jhe */ |
473 | goto kbranch; | |
34805931 | 474 | case BPF_JMP | BPF_JEQ | BPF_K: /* ip += (A == K) ? jt : jf */ |
c10302ef MS |
475 | mask = 0x800000; /* je */ |
476 | kbranch: /* Emit compare if the branch targets are different */ | |
477 | if (filter->jt != filter->jf) { | |
478 | if (K <= 16383) | |
479 | /* chi %r5,<K> */ | |
480 | EMIT4_IMM(0xa75e0000, K); | |
68d9884d HC |
481 | else if (test_facility(21)) |
482 | /* clfi %r5,<K> */ | |
483 | EMIT6_IMM(0xc25f0000, K); | |
c10302ef MS |
484 | else |
485 | /* c %r5,<d(K)>(%r13) */ | |
486 | EMIT4_DISP(0x5950d000, EMIT_CONST(K)); | |
487 | } | |
488 | branch: if (filter->jt == filter->jf) { | |
489 | if (filter->jt == 0) | |
490 | break; | |
491 | /* j <jt> */ | |
492 | offset = addrs[i + filter->jt] + jit->start - jit->prg; | |
493 | EMIT4_PCREL(0xa7f40000, offset); | |
494 | break; | |
495 | } | |
496 | if (filter->jt != 0) { | |
497 | /* brc <mask>,<jt> */ | |
498 | offset = addrs[i + filter->jt] + jit->start - jit->prg; | |
499 | EMIT4_PCREL(0xa7040000 | mask, offset); | |
500 | } | |
501 | if (filter->jf != 0) { | |
502 | /* brc <mask^15>,<jf> */ | |
503 | offset = addrs[i + filter->jf] + jit->start - jit->prg; | |
504 | EMIT4_PCREL(0xa7040000 | (mask ^ 0xf00000), offset); | |
505 | } | |
506 | break; | |
34805931 | 507 | case BPF_JMP | BPF_JSET | BPF_K: /* ip += (A & K) ? jt : jf */ |
c10302ef MS |
508 | mask = 0x700000; /* jnz */ |
509 | /* Emit test if the branch targets are different */ | |
510 | if (filter->jt != filter->jf) { | |
511 | if (K > 65535) { | |
512 | /* lr %r4,%r5 */ | |
513 | EMIT2(0x1845); | |
514 | /* n %r4,<d(K)>(%r13) */ | |
515 | EMIT4_DISP(0x5440d000, EMIT_CONST(K)); | |
516 | } else | |
517 | /* tmll %r5,K */ | |
518 | EMIT4_IMM(0xa7510000, K); | |
519 | } | |
520 | goto branch; | |
34805931 | 521 | case BPF_JMP | BPF_JGT | BPF_X: /* ip += (A > X) ? jt : jf */ |
c10302ef MS |
522 | mask = 0x200000; /* jh */ |
523 | goto xbranch; | |
34805931 | 524 | case BPF_JMP | BPF_JGE | BPF_X: /* ip += (A >= X) ? jt : jf */ |
c10302ef MS |
525 | mask = 0xa00000; /* jhe */ |
526 | goto xbranch; | |
34805931 | 527 | case BPF_JMP | BPF_JEQ | BPF_X: /* ip += (A == X) ? jt : jf */ |
c10302ef MS |
528 | mask = 0x800000; /* je */ |
529 | xbranch: /* Emit compare if the branch targets are different */ | |
530 | if (filter->jt != filter->jf) { | |
531 | jit->seen |= SEEN_XREG; | |
532 | /* cr %r5,%r12 */ | |
533 | EMIT2(0x195c); | |
534 | } | |
535 | goto branch; | |
34805931 | 536 | case BPF_JMP | BPF_JSET | BPF_X: /* ip += (A & X) ? jt : jf */ |
c10302ef MS |
537 | mask = 0x700000; /* jnz */ |
538 | /* Emit test if the branch targets are different */ | |
539 | if (filter->jt != filter->jf) { | |
540 | jit->seen |= SEEN_XREG; | |
541 | /* lr %r4,%r5 */ | |
542 | EMIT2(0x1845); | |
543 | /* nr %r4,%r12 */ | |
544 | EMIT2(0x144c); | |
545 | } | |
546 | goto branch; | |
34805931 | 547 | case BPF_LD | BPF_W | BPF_ABS: /* A = *(u32 *) (skb->data+K) */ |
c10302ef MS |
548 | jit->seen |= SEEN_DATAREF | SEEN_RET0 | SEEN_LOAD_WORD; |
549 | offset = jit->off_load_word; | |
550 | goto load_abs; | |
34805931 | 551 | case BPF_LD | BPF_H | BPF_ABS: /* A = *(u16 *) (skb->data+K) */ |
c10302ef MS |
552 | jit->seen |= SEEN_DATAREF | SEEN_RET0 | SEEN_LOAD_HALF; |
553 | offset = jit->off_load_half; | |
554 | goto load_abs; | |
34805931 | 555 | case BPF_LD | BPF_B | BPF_ABS: /* A = *(u8 *) (skb->data+K) */ |
c10302ef MS |
556 | jit->seen |= SEEN_DATAREF | SEEN_RET0 | SEEN_LOAD_BYTE; |
557 | offset = jit->off_load_byte; | |
558 | load_abs: if ((int) K < 0) | |
559 | goto out; | |
560 | call_fn: /* lg %r1,<d(function)>(%r13) */ | |
561 | EMIT6_DISP(0xe310d000, 0x0004, offset); | |
562 | /* l %r3,<d(K)>(%r13) */ | |
563 | EMIT4_DISP(0x5830d000, EMIT_CONST(K)); | |
564 | /* basr %r8,%r1 */ | |
565 | EMIT2(0x0d81); | |
566 | /* jnz <ret0> */ | |
567 | EMIT4_PCREL(0xa7740000, (jit->ret0_ip - jit->prg)); | |
568 | break; | |
34805931 | 569 | case BPF_LD | BPF_W | BPF_IND: /* A = *(u32 *) (skb->data+K+X) */ |
c10302ef MS |
570 | jit->seen |= SEEN_DATAREF | SEEN_RET0 | SEEN_LOAD_IWORD; |
571 | offset = jit->off_load_iword; | |
572 | goto call_fn; | |
34805931 | 573 | case BPF_LD | BPF_H | BPF_IND: /* A = *(u16 *) (skb->data+K+X) */ |
c10302ef MS |
574 | jit->seen |= SEEN_DATAREF | SEEN_RET0 | SEEN_LOAD_IHALF; |
575 | offset = jit->off_load_ihalf; | |
576 | goto call_fn; | |
34805931 | 577 | case BPF_LD | BPF_B | BPF_IND: /* A = *(u8 *) (skb->data+K+X) */ |
c10302ef MS |
578 | jit->seen |= SEEN_DATAREF | SEEN_RET0 | SEEN_LOAD_IBYTE; |
579 | offset = jit->off_load_ibyte; | |
580 | goto call_fn; | |
34805931 | 581 | case BPF_LDX | BPF_B | BPF_MSH: |
c10302ef MS |
582 | /* X = (*(u8 *)(skb->data+K) & 0xf) << 2 */ |
583 | jit->seen |= SEEN_RET0; | |
584 | if ((int) K < 0) { | |
585 | /* j <ret0> */ | |
586 | EMIT4_PCREL(0xa7f40000, (jit->ret0_ip - jit->prg)); | |
587 | break; | |
588 | } | |
589 | jit->seen |= SEEN_DATAREF | SEEN_LOAD_BMSH; | |
590 | offset = jit->off_load_bmsh; | |
591 | goto call_fn; | |
34805931 | 592 | case BPF_LD | BPF_W | BPF_LEN: /* A = skb->len; */ |
c10302ef MS |
593 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, len) != 4); |
594 | /* l %r5,<d(len)>(%r2) */ | |
595 | EMIT4_DISP(0x58502000, offsetof(struct sk_buff, len)); | |
596 | break; | |
34805931 | 597 | case BPF_LDX | BPF_W | BPF_LEN: /* X = skb->len; */ |
c10302ef MS |
598 | jit->seen |= SEEN_XREG; |
599 | /* l %r12,<d(len)>(%r2) */ | |
600 | EMIT4_DISP(0x58c02000, offsetof(struct sk_buff, len)); | |
601 | break; | |
34805931 | 602 | case BPF_LD | BPF_IMM: /* A = K */ |
c10302ef MS |
603 | if (K <= 16383) |
604 | /* lhi %r5,K */ | |
605 | EMIT4_IMM(0xa7580000, K); | |
68d9884d HC |
606 | else if (test_facility(21)) |
607 | /* llilf %r5,<K> */ | |
608 | EMIT6_IMM(0xc05f0000, K); | |
c10302ef MS |
609 | else |
610 | /* l %r5,<d(K)>(%r13) */ | |
611 | EMIT4_DISP(0x5850d000, EMIT_CONST(K)); | |
612 | break; | |
34805931 | 613 | case BPF_LDX | BPF_IMM: /* X = K */ |
c10302ef MS |
614 | jit->seen |= SEEN_XREG; |
615 | if (K <= 16383) | |
616 | /* lhi %r12,<K> */ | |
617 | EMIT4_IMM(0xa7c80000, K); | |
68d9884d HC |
618 | else if (test_facility(21)) |
619 | /* llilf %r12,<K> */ | |
620 | EMIT6_IMM(0xc0cf0000, K); | |
c10302ef MS |
621 | else |
622 | /* l %r12,<d(K)>(%r13) */ | |
623 | EMIT4_DISP(0x58c0d000, EMIT_CONST(K)); | |
624 | break; | |
34805931 | 625 | case BPF_LD | BPF_MEM: /* A = mem[K] */ |
c10302ef MS |
626 | jit->seen |= SEEN_MEM; |
627 | /* l %r5,<K>(%r15) */ | |
628 | EMIT4_DISP(0x5850f000, | |
629 | (jit->seen & SEEN_DATAREF) ? 160 + K*4 : K*4); | |
630 | break; | |
34805931 | 631 | case BPF_LDX | BPF_MEM: /* X = mem[K] */ |
c10302ef MS |
632 | jit->seen |= SEEN_XREG | SEEN_MEM; |
633 | /* l %r12,<K>(%r15) */ | |
634 | EMIT4_DISP(0x58c0f000, | |
635 | (jit->seen & SEEN_DATAREF) ? 160 + K*4 : K*4); | |
636 | break; | |
34805931 | 637 | case BPF_MISC | BPF_TAX: /* X = A */ |
c10302ef MS |
638 | jit->seen |= SEEN_XREG; |
639 | /* lr %r12,%r5 */ | |
640 | EMIT2(0x18c5); | |
641 | break; | |
34805931 | 642 | case BPF_MISC | BPF_TXA: /* A = X */ |
c10302ef MS |
643 | jit->seen |= SEEN_XREG; |
644 | /* lr %r5,%r12 */ | |
645 | EMIT2(0x185c); | |
646 | break; | |
34805931 | 647 | case BPF_RET | BPF_K: |
c10302ef MS |
648 | if (K == 0) { |
649 | jit->seen |= SEEN_RET0; | |
650 | if (last) | |
651 | break; | |
652 | /* j <ret0> */ | |
653 | EMIT4_PCREL(0xa7f40000, jit->ret0_ip - jit->prg); | |
654 | } else { | |
655 | if (K <= 16383) | |
656 | /* lghi %r2,K */ | |
657 | EMIT4_IMM(0xa7290000, K); | |
658 | else | |
659 | /* llgf %r2,<K>(%r13) */ | |
660 | EMIT6_DISP(0xe320d000, 0x0016, EMIT_CONST(K)); | |
661 | /* j <exit> */ | |
662 | if (last && !(jit->seen & SEEN_RET0)) | |
663 | break; | |
664 | EMIT4_PCREL(0xa7f40000, jit->exit_ip - jit->prg); | |
665 | } | |
666 | break; | |
34805931 | 667 | case BPF_RET | BPF_A: |
c10302ef MS |
668 | /* llgfr %r2,%r5 */ |
669 | EMIT4(0xb9160025); | |
670 | /* j <exit> */ | |
671 | EMIT4_PCREL(0xa7f40000, jit->exit_ip - jit->prg); | |
672 | break; | |
34805931 | 673 | case BPF_ST: /* mem[K] = A */ |
c10302ef MS |
674 | jit->seen |= SEEN_MEM; |
675 | /* st %r5,<K>(%r15) */ | |
676 | EMIT4_DISP(0x5050f000, | |
677 | (jit->seen & SEEN_DATAREF) ? 160 + K*4 : K*4); | |
678 | break; | |
34805931 | 679 | case BPF_STX: /* mem[K] = X : mov %ebx,off8(%rbp) */ |
c10302ef MS |
680 | jit->seen |= SEEN_XREG | SEEN_MEM; |
681 | /* st %r12,<K>(%r15) */ | |
682 | EMIT4_DISP(0x50c0f000, | |
683 | (jit->seen & SEEN_DATAREF) ? 160 + K*4 : K*4); | |
684 | break; | |
34805931 | 685 | case BPF_ANC | SKF_AD_PROTOCOL: /* A = ntohs(skb->protocol); */ |
c10302ef MS |
686 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2); |
687 | /* lhi %r5,0 */ | |
688 | EMIT4(0xa7580000); | |
689 | /* icm %r5,3,<d(protocol)>(%r2) */ | |
690 | EMIT4_DISP(0xbf532000, offsetof(struct sk_buff, protocol)); | |
691 | break; | |
34805931 DB |
692 | case BPF_ANC | SKF_AD_IFINDEX: /* if (!skb->dev) return 0; |
693 | * A = skb->dev->ifindex */ | |
c10302ef MS |
694 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); |
695 | jit->seen |= SEEN_RET0; | |
696 | /* lg %r1,<d(dev)>(%r2) */ | |
697 | EMIT6_DISP(0xe3102000, 0x0004, offsetof(struct sk_buff, dev)); | |
698 | /* ltgr %r1,%r1 */ | |
699 | EMIT4(0xb9020011); | |
700 | /* jz <ret0> */ | |
701 | EMIT4_PCREL(0xa7840000, jit->ret0_ip - jit->prg); | |
702 | /* l %r5,<d(ifindex)>(%r1) */ | |
703 | EMIT4_DISP(0x58501000, offsetof(struct net_device, ifindex)); | |
704 | break; | |
34805931 | 705 | case BPF_ANC | SKF_AD_MARK: /* A = skb->mark */ |
c10302ef MS |
706 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); |
707 | /* l %r5,<d(mark)>(%r2) */ | |
708 | EMIT4_DISP(0x58502000, offsetof(struct sk_buff, mark)); | |
709 | break; | |
34805931 | 710 | case BPF_ANC | SKF_AD_QUEUE: /* A = skb->queue_mapping */ |
c10302ef MS |
711 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2); |
712 | /* lhi %r5,0 */ | |
713 | EMIT4(0xa7580000); | |
714 | /* icm %r5,3,<d(queue_mapping)>(%r2) */ | |
715 | EMIT4_DISP(0xbf532000, offsetof(struct sk_buff, queue_mapping)); | |
716 | break; | |
34805931 DB |
717 | case BPF_ANC | SKF_AD_HATYPE: /* if (!skb->dev) return 0; |
718 | * A = skb->dev->type */ | |
c10302ef MS |
719 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2); |
720 | jit->seen |= SEEN_RET0; | |
721 | /* lg %r1,<d(dev)>(%r2) */ | |
722 | EMIT6_DISP(0xe3102000, 0x0004, offsetof(struct sk_buff, dev)); | |
723 | /* ltgr %r1,%r1 */ | |
724 | EMIT4(0xb9020011); | |
725 | /* jz <ret0> */ | |
726 | EMIT4_PCREL(0xa7840000, jit->ret0_ip - jit->prg); | |
727 | /* lhi %r5,0 */ | |
728 | EMIT4(0xa7580000); | |
729 | /* icm %r5,3,<d(type)>(%r1) */ | |
730 | EMIT4_DISP(0xbf531000, offsetof(struct net_device, type)); | |
731 | break; | |
34805931 | 732 | case BPF_ANC | SKF_AD_RXHASH: /* A = skb->hash */ |
61b905da TH |
733 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); |
734 | /* l %r5,<d(hash)>(%r2) */ | |
735 | EMIT4_DISP(0x58502000, offsetof(struct sk_buff, hash)); | |
c10302ef | 736 | break; |
34805931 DB |
737 | case BPF_ANC | SKF_AD_VLAN_TAG: |
738 | case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT: | |
5303a0fe HC |
739 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); |
740 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); | |
741 | /* lhi %r5,0 */ | |
742 | EMIT4(0xa7580000); | |
743 | /* icm %r5,3,<d(vlan_tci)>(%r2) */ | |
744 | EMIT4_DISP(0xbf532000, offsetof(struct sk_buff, vlan_tci)); | |
34805931 | 745 | if (code == (BPF_ANC | SKF_AD_VLAN_TAG)) { |
5303a0fe HC |
746 | /* nill %r5,0xefff */ |
747 | EMIT4_IMM(0xa5570000, ~VLAN_TAG_PRESENT); | |
748 | } else { | |
749 | /* nill %r5,0x1000 */ | |
750 | EMIT4_IMM(0xa5570000, VLAN_TAG_PRESENT); | |
751 | /* srl %r5,12 */ | |
752 | EMIT4_DISP(0x88500000, 12); | |
753 | } | |
754 | break; | |
34805931 | 755 | case BPF_ANC | SKF_AD_PKTTYPE: |
c9a7afa3 HC |
756 | if (pkt_type_offset < 0) |
757 | goto out; | |
758 | /* lhi %r5,0 */ | |
759 | EMIT4(0xa7580000); | |
760 | /* ic %r5,<d(pkt_type_offset)>(%r2) */ | |
761 | EMIT4_DISP(0x43502000, pkt_type_offset); | |
762 | /* srl %r5,5 */ | |
763 | EMIT4_DISP(0x88500000, 5); | |
764 | break; | |
34805931 | 765 | case BPF_ANC | SKF_AD_CPU: /* A = smp_processor_id() */ |
c10302ef MS |
766 | #ifdef CONFIG_SMP |
767 | /* l %r5,<d(cpu_nr)> */ | |
768 | EMIT4_DISP(0x58500000, offsetof(struct _lowcore, cpu_nr)); | |
769 | #else | |
770 | /* lhi %r5,0 */ | |
771 | EMIT4(0xa7580000); | |
772 | #endif | |
773 | break; | |
774 | default: /* too complex, give up */ | |
775 | goto out; | |
776 | } | |
777 | addrs[i] = jit->prg - jit->start; | |
778 | return 0; | |
779 | out: | |
780 | return -1; | |
781 | } | |
782 | ||
aa2d2c73 HC |
783 | /* |
784 | * Note: for security reasons, bpf code will follow a randomly | |
785 | * sized amount of illegal instructions. | |
786 | */ | |
787 | struct bpf_binary_header { | |
788 | unsigned int pages; | |
789 | u8 image[]; | |
790 | }; | |
791 | ||
792 | static struct bpf_binary_header *bpf_alloc_binary(unsigned int bpfsize, | |
793 | u8 **image_ptr) | |
794 | { | |
795 | struct bpf_binary_header *header; | |
796 | unsigned int sz, hole; | |
797 | ||
798 | /* Most BPF filters are really small, but if some of them fill a page, | |
799 | * allow at least 128 extra bytes for illegal instructions. | |
800 | */ | |
801 | sz = round_up(bpfsize + sizeof(*header) + 128, PAGE_SIZE); | |
802 | header = module_alloc(sz); | |
803 | if (!header) | |
804 | return NULL; | |
805 | memset(header, 0, sz); | |
806 | header->pages = sz / PAGE_SIZE; | |
e84d2f8d | 807 | hole = min(sz - (bpfsize + sizeof(*header)), PAGE_SIZE - sizeof(*header)); |
aa2d2c73 HC |
808 | /* Insert random number of illegal instructions before BPF code |
809 | * and make sure the first instruction starts at an even address. | |
810 | */ | |
811 | *image_ptr = &header->image[(prandom_u32() % hole) & -2]; | |
812 | return header; | |
813 | } | |
814 | ||
7ae457c1 | 815 | void bpf_jit_compile(struct bpf_prog *fp) |
c10302ef | 816 | { |
aa2d2c73 | 817 | struct bpf_binary_header *header = NULL; |
c10302ef MS |
818 | unsigned long size, prg_len, lit_len; |
819 | struct bpf_jit jit, cjit; | |
820 | unsigned int *addrs; | |
821 | int pass, i; | |
822 | ||
823 | if (!bpf_jit_enable) | |
824 | return; | |
3d04fea5 | 825 | addrs = kcalloc(fp->len, sizeof(*addrs), GFP_KERNEL); |
c10302ef MS |
826 | if (addrs == NULL) |
827 | return; | |
c10302ef MS |
828 | memset(&jit, 0, sizeof(cjit)); |
829 | memset(&cjit, 0, sizeof(cjit)); | |
830 | ||
831 | for (pass = 0; pass < 10; pass++) { | |
832 | jit.prg = jit.start; | |
833 | jit.lit = jit.mid; | |
834 | ||
835 | bpf_jit_prologue(&jit); | |
836 | bpf_jit_noleaks(&jit, fp->insns); | |
837 | for (i = 0; i < fp->len; i++) { | |
838 | if (bpf_jit_insn(&jit, fp->insns + i, addrs, i, | |
839 | i == fp->len - 1)) | |
840 | goto out; | |
841 | } | |
842 | bpf_jit_epilogue(&jit); | |
843 | if (jit.start) { | |
844 | WARN_ON(jit.prg > cjit.prg || jit.lit > cjit.lit); | |
845 | if (memcmp(&jit, &cjit, sizeof(jit)) == 0) | |
846 | break; | |
847 | } else if (jit.prg == cjit.prg && jit.lit == cjit.lit) { | |
848 | prg_len = jit.prg - jit.start; | |
849 | lit_len = jit.lit - jit.mid; | |
1eeb7478 | 850 | size = prg_len + lit_len; |
c10302ef MS |
851 | if (size >= BPF_SIZE_MAX) |
852 | goto out; | |
aa2d2c73 HC |
853 | header = bpf_alloc_binary(size, &jit.start); |
854 | if (!header) | |
c10302ef MS |
855 | goto out; |
856 | jit.prg = jit.mid = jit.start + prg_len; | |
857 | jit.lit = jit.end = jit.start + prg_len + lit_len; | |
858 | jit.base_ip += (unsigned long) jit.start; | |
859 | jit.exit_ip += (unsigned long) jit.start; | |
860 | jit.ret0_ip += (unsigned long) jit.start; | |
861 | } | |
862 | cjit = jit; | |
863 | } | |
864 | if (bpf_jit_enable > 1) { | |
fee1b548 HC |
865 | bpf_jit_dump(fp->len, jit.end - jit.start, pass, jit.start); |
866 | if (jit.start) | |
c10302ef | 867 | print_fn_code(jit.start, jit.mid - jit.start); |
c10302ef | 868 | } |
aa2d2c73 HC |
869 | if (jit.start) { |
870 | set_memory_ro((unsigned long)header, header->pages); | |
c10302ef | 871 | fp->bpf_func = (void *) jit.start; |
f8bbbfc3 | 872 | fp->jited = 1; |
aa2d2c73 | 873 | } |
c10302ef MS |
874 | out: |
875 | kfree(addrs); | |
876 | } | |
877 | ||
7ae457c1 | 878 | void bpf_jit_free(struct bpf_prog *fp) |
c10302ef | 879 | { |
aa2d2c73 HC |
880 | unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK; |
881 | struct bpf_binary_header *header = (void *)addr; | |
882 | ||
f8bbbfc3 | 883 | if (!fp->jited) |
d45ed4a4 | 884 | goto free_filter; |
f8bbbfc3 | 885 | |
aa2d2c73 HC |
886 | set_memory_rw(addr, header->pages); |
887 | module_free(NULL, header); | |
f8bbbfc3 | 888 | |
d45ed4a4 | 889 | free_filter: |
60a3b225 | 890 | bpf_prog_unlock_free(fp); |
c10302ef | 891 | } |