Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Just-In-Time compiler for BPF filters on 32bit ARM |
| 3 | * |
| 4 | * Copyright (c) 2011 Mircea Gherzan <mgherzan@gmail.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the |
| 8 | * Free Software Foundation; version 2 of the License. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/bitops.h> |
| 12 | #include <linux/compiler.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/filter.h> |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/slab.h> |
Daniel Borkmann | bf0098f | 2012-11-07 15:31:02 +0000 | [diff] [blame] | 18 | #include <linux/if_vlan.h> |
Daniel Borkmann | e8b56d5 | 2014-09-19 14:56:57 +0200 | [diff] [blame] | 19 | |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 20 | #include <asm/cacheflush.h> |
| 21 | #include <asm/hwcap.h> |
Ben Dooks | 3460743 | 2013-07-24 15:44:56 +0100 | [diff] [blame] | 22 | #include <asm/opcodes.h> |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 23 | |
| 24 | #include "bpf_jit_32.h" |
| 25 | |
| 26 | /* |
| 27 | * ABI: |
| 28 | * |
| 29 | * r0 scratch register |
| 30 | * r4 BPF register A |
| 31 | * r5 BPF register X |
| 32 | * r6 pointer to the skb |
| 33 | * r7 skb->data |
| 34 | * r8 skb_headlen(skb) |
| 35 | */ |
| 36 | |
| 37 | #define r_scratch ARM_R0 |
| 38 | /* r1-r3 are (also) used for the unaligned loads on the non-ARMv7 slowpath */ |
| 39 | #define r_off ARM_R1 |
| 40 | #define r_A ARM_R4 |
| 41 | #define r_X ARM_R5 |
| 42 | #define r_skb ARM_R6 |
| 43 | #define r_skb_data ARM_R7 |
| 44 | #define r_skb_hl ARM_R8 |
| 45 | |
| 46 | #define SCRATCH_SP_OFFSET 0 |
Schichan Nicolas | fe15f3f | 2012-12-10 14:49:40 +0100 | [diff] [blame] | 47 | #define SCRATCH_OFF(k) (SCRATCH_SP_OFFSET + 4 * (k)) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 48 | |
| 49 | #define SEEN_MEM ((1 << BPF_MEMWORDS) - 1) |
| 50 | #define SEEN_MEM_WORD(k) (1 << (k)) |
| 51 | #define SEEN_X (1 << BPF_MEMWORDS) |
| 52 | #define SEEN_CALL (1 << (BPF_MEMWORDS + 1)) |
| 53 | #define SEEN_SKB (1 << (BPF_MEMWORDS + 2)) |
| 54 | #define SEEN_DATA (1 << (BPF_MEMWORDS + 3)) |
| 55 | |
| 56 | #define FLAG_NEED_X_RESET (1 << 0) |
Nicolas Schichan | 0b59d88 | 2015-05-07 17:14:21 +0200 | [diff] [blame] | 57 | #define FLAG_IMM_OVERFLOW (1 << 1) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 58 | |
| 59 | struct jit_ctx { |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 60 | const struct bpf_prog *skf; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 61 | unsigned idx; |
| 62 | unsigned prologue_bytes; |
| 63 | int ret0_fp_idx; |
| 64 | u32 seen; |
| 65 | u32 flags; |
| 66 | u32 *offsets; |
| 67 | u32 *target; |
| 68 | #if __LINUX_ARM_ARCH__ < 7 |
| 69 | u16 epilogue_bytes; |
| 70 | u16 imm_count; |
| 71 | u32 *imms; |
| 72 | #endif |
| 73 | }; |
| 74 | |
| 75 | int bpf_jit_enable __read_mostly; |
| 76 | |
Nicolas Schichan | 6d715e3 | 2015-07-21 14:14:13 +0200 | [diff] [blame] | 77 | static inline int call_neg_helper(struct sk_buff *skb, int offset, void *ret, |
| 78 | unsigned int size) |
| 79 | { |
| 80 | void *ptr = bpf_internal_load_pointer_neg_helper(skb, offset, size); |
| 81 | |
| 82 | if (!ptr) |
| 83 | return -EFAULT; |
| 84 | memcpy(ret, ptr, size); |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static u64 jit_get_skb_b(struct sk_buff *skb, int offset) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 89 | { |
| 90 | u8 ret; |
| 91 | int err; |
| 92 | |
Nicolas Schichan | 6d715e3 | 2015-07-21 14:14:13 +0200 | [diff] [blame] | 93 | if (offset < 0) |
| 94 | err = call_neg_helper(skb, offset, &ret, 1); |
| 95 | else |
| 96 | err = skb_copy_bits(skb, offset, &ret, 1); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 97 | |
| 98 | return (u64)err << 32 | ret; |
| 99 | } |
| 100 | |
Nicolas Schichan | 6d715e3 | 2015-07-21 14:14:13 +0200 | [diff] [blame] | 101 | static u64 jit_get_skb_h(struct sk_buff *skb, int offset) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 102 | { |
| 103 | u16 ret; |
| 104 | int err; |
| 105 | |
Nicolas Schichan | 6d715e3 | 2015-07-21 14:14:13 +0200 | [diff] [blame] | 106 | if (offset < 0) |
| 107 | err = call_neg_helper(skb, offset, &ret, 2); |
| 108 | else |
| 109 | err = skb_copy_bits(skb, offset, &ret, 2); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 110 | |
| 111 | return (u64)err << 32 | ntohs(ret); |
| 112 | } |
| 113 | |
Nicolas Schichan | 6d715e3 | 2015-07-21 14:14:13 +0200 | [diff] [blame] | 114 | static u64 jit_get_skb_w(struct sk_buff *skb, int offset) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 115 | { |
| 116 | u32 ret; |
| 117 | int err; |
| 118 | |
Nicolas Schichan | 6d715e3 | 2015-07-21 14:14:13 +0200 | [diff] [blame] | 119 | if (offset < 0) |
| 120 | err = call_neg_helper(skb, offset, &ret, 4); |
| 121 | else |
| 122 | err = skb_copy_bits(skb, offset, &ret, 4); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 123 | |
| 124 | return (u64)err << 32 | ntohl(ret); |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * Wrapper that handles both OABI and EABI and assures Thumb2 interworking |
| 129 | * (where the assembly routines like __aeabi_uidiv could cause problems). |
| 130 | */ |
| 131 | static u32 jit_udiv(u32 dividend, u32 divisor) |
| 132 | { |
| 133 | return dividend / divisor; |
| 134 | } |
| 135 | |
| 136 | static inline void _emit(int cond, u32 inst, struct jit_ctx *ctx) |
| 137 | { |
Ben Dooks | 3460743 | 2013-07-24 15:44:56 +0100 | [diff] [blame] | 138 | inst |= (cond << 28); |
| 139 | inst = __opcode_to_mem_arm(inst); |
| 140 | |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 141 | if (ctx->target != NULL) |
Ben Dooks | 3460743 | 2013-07-24 15:44:56 +0100 | [diff] [blame] | 142 | ctx->target[ctx->idx] = inst; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 143 | |
| 144 | ctx->idx++; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Emit an instruction that will be executed unconditionally. |
| 149 | */ |
| 150 | static inline void emit(u32 inst, struct jit_ctx *ctx) |
| 151 | { |
| 152 | _emit(ARM_COND_AL, inst, ctx); |
| 153 | } |
| 154 | |
| 155 | static u16 saved_regs(struct jit_ctx *ctx) |
| 156 | { |
| 157 | u16 ret = 0; |
| 158 | |
| 159 | if ((ctx->skf->len > 1) || |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 160 | (ctx->skf->insns[0].code == (BPF_RET | BPF_A))) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 161 | ret |= 1 << r_A; |
| 162 | |
| 163 | #ifdef CONFIG_FRAME_POINTER |
| 164 | ret |= (1 << ARM_FP) | (1 << ARM_IP) | (1 << ARM_LR) | (1 << ARM_PC); |
| 165 | #else |
| 166 | if (ctx->seen & SEEN_CALL) |
| 167 | ret |= 1 << ARM_LR; |
| 168 | #endif |
| 169 | if (ctx->seen & (SEEN_DATA | SEEN_SKB)) |
| 170 | ret |= 1 << r_skb; |
| 171 | if (ctx->seen & SEEN_DATA) |
| 172 | ret |= (1 << r_skb_data) | (1 << r_skb_hl); |
| 173 | if (ctx->seen & SEEN_X) |
| 174 | ret |= 1 << r_X; |
| 175 | |
| 176 | return ret; |
| 177 | } |
| 178 | |
| 179 | static inline int mem_words_used(struct jit_ctx *ctx) |
| 180 | { |
| 181 | /* yes, we do waste some stack space IF there are "holes" in the set" */ |
| 182 | return fls(ctx->seen & SEEN_MEM); |
| 183 | } |
| 184 | |
| 185 | static inline bool is_load_to_a(u16 inst) |
| 186 | { |
| 187 | switch (inst) { |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 188 | case BPF_LD | BPF_W | BPF_LEN: |
| 189 | case BPF_LD | BPF_W | BPF_ABS: |
| 190 | case BPF_LD | BPF_H | BPF_ABS: |
| 191 | case BPF_LD | BPF_B | BPF_ABS: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 192 | return true; |
| 193 | default: |
| 194 | return false; |
| 195 | } |
| 196 | } |
| 197 | |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 198 | static void jit_fill_hole(void *area, unsigned int size) |
| 199 | { |
Daniel Borkmann | e8b56d5 | 2014-09-19 14:56:57 +0200 | [diff] [blame] | 200 | u32 *ptr; |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 201 | /* We are guaranteed to have aligned memory. */ |
| 202 | for (ptr = area; size >= sizeof(u32); size -= sizeof(u32)) |
Daniel Borkmann | e8b56d5 | 2014-09-19 14:56:57 +0200 | [diff] [blame] | 203 | *ptr++ = __opcode_to_mem_arm(ARM_INST_UDF); |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 204 | } |
| 205 | |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 206 | static void build_prologue(struct jit_ctx *ctx) |
| 207 | { |
| 208 | u16 reg_set = saved_regs(ctx); |
| 209 | u16 first_inst = ctx->skf->insns[0].code; |
| 210 | u16 off; |
| 211 | |
| 212 | #ifdef CONFIG_FRAME_POINTER |
| 213 | emit(ARM_MOV_R(ARM_IP, ARM_SP), ctx); |
| 214 | emit(ARM_PUSH(reg_set), ctx); |
| 215 | emit(ARM_SUB_I(ARM_FP, ARM_IP, 4), ctx); |
| 216 | #else |
| 217 | if (reg_set) |
| 218 | emit(ARM_PUSH(reg_set), ctx); |
| 219 | #endif |
| 220 | |
| 221 | if (ctx->seen & (SEEN_DATA | SEEN_SKB)) |
| 222 | emit(ARM_MOV_R(r_skb, ARM_R0), ctx); |
| 223 | |
| 224 | if (ctx->seen & SEEN_DATA) { |
| 225 | off = offsetof(struct sk_buff, data); |
| 226 | emit(ARM_LDR_I(r_skb_data, r_skb, off), ctx); |
| 227 | /* headlen = len - data_len */ |
| 228 | off = offsetof(struct sk_buff, len); |
| 229 | emit(ARM_LDR_I(r_skb_hl, r_skb, off), ctx); |
| 230 | off = offsetof(struct sk_buff, data_len); |
| 231 | emit(ARM_LDR_I(r_scratch, r_skb, off), ctx); |
| 232 | emit(ARM_SUB_R(r_skb_hl, r_skb_hl, r_scratch), ctx); |
| 233 | } |
| 234 | |
| 235 | if (ctx->flags & FLAG_NEED_X_RESET) |
| 236 | emit(ARM_MOV_I(r_X, 0), ctx); |
| 237 | |
| 238 | /* do not leak kernel data to userspace */ |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 239 | if ((first_inst != (BPF_RET | BPF_K)) && !(is_load_to_a(first_inst))) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 240 | emit(ARM_MOV_I(r_A, 0), ctx); |
| 241 | |
| 242 | /* stack space for the BPF_MEM words */ |
| 243 | if (ctx->seen & SEEN_MEM) |
| 244 | emit(ARM_SUB_I(ARM_SP, ARM_SP, mem_words_used(ctx) * 4), ctx); |
| 245 | } |
| 246 | |
| 247 | static void build_epilogue(struct jit_ctx *ctx) |
| 248 | { |
| 249 | u16 reg_set = saved_regs(ctx); |
| 250 | |
| 251 | if (ctx->seen & SEEN_MEM) |
| 252 | emit(ARM_ADD_I(ARM_SP, ARM_SP, mem_words_used(ctx) * 4), ctx); |
| 253 | |
| 254 | reg_set &= ~(1 << ARM_LR); |
| 255 | |
| 256 | #ifdef CONFIG_FRAME_POINTER |
| 257 | /* the first instruction of the prologue was: mov ip, sp */ |
| 258 | reg_set &= ~(1 << ARM_IP); |
| 259 | reg_set |= (1 << ARM_SP); |
| 260 | emit(ARM_LDM(ARM_SP, reg_set), ctx); |
| 261 | #else |
| 262 | if (reg_set) { |
| 263 | if (ctx->seen & SEEN_CALL) |
| 264 | reg_set |= 1 << ARM_PC; |
| 265 | emit(ARM_POP(reg_set), ctx); |
| 266 | } |
| 267 | |
| 268 | if (!(ctx->seen & SEEN_CALL)) |
| 269 | emit(ARM_BX(ARM_LR), ctx); |
| 270 | #endif |
| 271 | } |
| 272 | |
| 273 | static int16_t imm8m(u32 x) |
| 274 | { |
| 275 | u32 rot; |
| 276 | |
| 277 | for (rot = 0; rot < 16; rot++) |
| 278 | if ((x & ~ror32(0xff, 2 * rot)) == 0) |
| 279 | return rol32(x, 2 * rot) | (rot << 8); |
| 280 | |
| 281 | return -1; |
| 282 | } |
| 283 | |
| 284 | #if __LINUX_ARM_ARCH__ < 7 |
| 285 | |
| 286 | static u16 imm_offset(u32 k, struct jit_ctx *ctx) |
| 287 | { |
| 288 | unsigned i = 0, offset; |
| 289 | u16 imm; |
| 290 | |
| 291 | /* on the "fake" run we just count them (duplicates included) */ |
| 292 | if (ctx->target == NULL) { |
| 293 | ctx->imm_count++; |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | while ((i < ctx->imm_count) && ctx->imms[i]) { |
| 298 | if (ctx->imms[i] == k) |
| 299 | break; |
| 300 | i++; |
| 301 | } |
| 302 | |
| 303 | if (ctx->imms[i] == 0) |
| 304 | ctx->imms[i] = k; |
| 305 | |
| 306 | /* constants go just after the epilogue */ |
| 307 | offset = ctx->offsets[ctx->skf->len]; |
| 308 | offset += ctx->prologue_bytes; |
| 309 | offset += ctx->epilogue_bytes; |
| 310 | offset += i * 4; |
| 311 | |
| 312 | ctx->target[offset / 4] = k; |
| 313 | |
| 314 | /* PC in ARM mode == address of the instruction + 8 */ |
| 315 | imm = offset - (8 + ctx->idx * 4); |
| 316 | |
Nicolas Schichan | 0b59d88 | 2015-05-07 17:14:21 +0200 | [diff] [blame] | 317 | if (imm & ~0xfff) { |
| 318 | /* |
| 319 | * literal pool is too far, signal it into flags. we |
| 320 | * can only detect it on the second pass unfortunately. |
| 321 | */ |
| 322 | ctx->flags |= FLAG_IMM_OVERFLOW; |
| 323 | return 0; |
| 324 | } |
| 325 | |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 326 | return imm; |
| 327 | } |
| 328 | |
| 329 | #endif /* __LINUX_ARM_ARCH__ */ |
| 330 | |
| 331 | /* |
| 332 | * Move an immediate that's not an imm8m to a core register. |
| 333 | */ |
| 334 | static inline void emit_mov_i_no8m(int rd, u32 val, struct jit_ctx *ctx) |
| 335 | { |
| 336 | #if __LINUX_ARM_ARCH__ < 7 |
| 337 | emit(ARM_LDR_I(rd, ARM_PC, imm_offset(val, ctx)), ctx); |
| 338 | #else |
| 339 | emit(ARM_MOVW(rd, val & 0xffff), ctx); |
| 340 | if (val > 0xffff) |
| 341 | emit(ARM_MOVT(rd, val >> 16), ctx); |
| 342 | #endif |
| 343 | } |
| 344 | |
| 345 | static inline void emit_mov_i(int rd, u32 val, struct jit_ctx *ctx) |
| 346 | { |
| 347 | int imm12 = imm8m(val); |
| 348 | |
| 349 | if (imm12 >= 0) |
| 350 | emit(ARM_MOV_I(rd, imm12), ctx); |
| 351 | else |
| 352 | emit_mov_i_no8m(rd, val, ctx); |
| 353 | } |
| 354 | |
| 355 | #if __LINUX_ARM_ARCH__ < 6 |
| 356 | |
| 357 | static void emit_load_be32(u8 cond, u8 r_res, u8 r_addr, struct jit_ctx *ctx) |
| 358 | { |
| 359 | _emit(cond, ARM_LDRB_I(ARM_R3, r_addr, 1), ctx); |
| 360 | _emit(cond, ARM_LDRB_I(ARM_R1, r_addr, 0), ctx); |
| 361 | _emit(cond, ARM_LDRB_I(ARM_R2, r_addr, 3), ctx); |
| 362 | _emit(cond, ARM_LSL_I(ARM_R3, ARM_R3, 16), ctx); |
| 363 | _emit(cond, ARM_LDRB_I(ARM_R0, r_addr, 2), ctx); |
| 364 | _emit(cond, ARM_ORR_S(ARM_R3, ARM_R3, ARM_R1, SRTYPE_LSL, 24), ctx); |
| 365 | _emit(cond, ARM_ORR_R(ARM_R3, ARM_R3, ARM_R2), ctx); |
| 366 | _emit(cond, ARM_ORR_S(r_res, ARM_R3, ARM_R0, SRTYPE_LSL, 8), ctx); |
| 367 | } |
| 368 | |
| 369 | static void emit_load_be16(u8 cond, u8 r_res, u8 r_addr, struct jit_ctx *ctx) |
| 370 | { |
| 371 | _emit(cond, ARM_LDRB_I(ARM_R1, r_addr, 0), ctx); |
| 372 | _emit(cond, ARM_LDRB_I(ARM_R2, r_addr, 1), ctx); |
| 373 | _emit(cond, ARM_ORR_S(r_res, ARM_R2, ARM_R1, SRTYPE_LSL, 8), ctx); |
| 374 | } |
| 375 | |
| 376 | static inline void emit_swap16(u8 r_dst, u8 r_src, struct jit_ctx *ctx) |
| 377 | { |
Nicolas Schichan | 462738f | 2013-02-13 17:30:39 +0000 | [diff] [blame] | 378 | /* r_dst = (r_src << 8) | (r_src >> 8) */ |
| 379 | emit(ARM_LSL_I(ARM_R1, r_src, 8), ctx); |
| 380 | emit(ARM_ORR_S(r_dst, ARM_R1, r_src, SRTYPE_LSR, 8), ctx); |
| 381 | |
| 382 | /* |
| 383 | * we need to mask out the bits set in r_dst[23:16] due to |
| 384 | * the first shift instruction. |
| 385 | * |
| 386 | * note that 0x8ff is the encoded immediate 0x00ff0000. |
| 387 | */ |
| 388 | emit(ARM_BIC_I(r_dst, r_dst, 0x8ff), ctx); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | #else /* ARMv6+ */ |
| 392 | |
| 393 | static void emit_load_be32(u8 cond, u8 r_res, u8 r_addr, struct jit_ctx *ctx) |
| 394 | { |
| 395 | _emit(cond, ARM_LDR_I(r_res, r_addr, 0), ctx); |
| 396 | #ifdef __LITTLE_ENDIAN |
| 397 | _emit(cond, ARM_REV(r_res, r_res), ctx); |
| 398 | #endif |
| 399 | } |
| 400 | |
| 401 | static void emit_load_be16(u8 cond, u8 r_res, u8 r_addr, struct jit_ctx *ctx) |
| 402 | { |
| 403 | _emit(cond, ARM_LDRH_I(r_res, r_addr, 0), ctx); |
| 404 | #ifdef __LITTLE_ENDIAN |
| 405 | _emit(cond, ARM_REV16(r_res, r_res), ctx); |
| 406 | #endif |
| 407 | } |
| 408 | |
| 409 | static inline void emit_swap16(u8 r_dst __maybe_unused, |
| 410 | u8 r_src __maybe_unused, |
| 411 | struct jit_ctx *ctx __maybe_unused) |
| 412 | { |
| 413 | #ifdef __LITTLE_ENDIAN |
| 414 | emit(ARM_REV16(r_dst, r_src), ctx); |
| 415 | #endif |
| 416 | } |
| 417 | |
| 418 | #endif /* __LINUX_ARM_ARCH__ < 6 */ |
| 419 | |
| 420 | |
| 421 | /* Compute the immediate value for a PC-relative branch. */ |
| 422 | static inline u32 b_imm(unsigned tgt, struct jit_ctx *ctx) |
| 423 | { |
| 424 | u32 imm; |
| 425 | |
| 426 | if (ctx->target == NULL) |
| 427 | return 0; |
| 428 | /* |
| 429 | * BPF allows only forward jumps and the offset of the target is |
| 430 | * still the one computed during the first pass. |
| 431 | */ |
| 432 | imm = ctx->offsets[tgt] + ctx->prologue_bytes - (ctx->idx * 4 + 8); |
| 433 | |
| 434 | return imm >> 2; |
| 435 | } |
| 436 | |
| 437 | #define OP_IMM3(op, r1, r2, imm_val, ctx) \ |
| 438 | do { \ |
| 439 | imm12 = imm8m(imm_val); \ |
| 440 | if (imm12 < 0) { \ |
| 441 | emit_mov_i_no8m(r_scratch, imm_val, ctx); \ |
| 442 | emit(op ## _R((r1), (r2), r_scratch), ctx); \ |
| 443 | } else { \ |
| 444 | emit(op ## _I((r1), (r2), imm12), ctx); \ |
| 445 | } \ |
| 446 | } while (0) |
| 447 | |
| 448 | static inline void emit_err_ret(u8 cond, struct jit_ctx *ctx) |
| 449 | { |
| 450 | if (ctx->ret0_fp_idx >= 0) { |
| 451 | _emit(cond, ARM_B(b_imm(ctx->ret0_fp_idx, ctx)), ctx); |
| 452 | /* NOP to keep the size constant between passes */ |
| 453 | emit(ARM_MOV_R(ARM_R0, ARM_R0), ctx); |
| 454 | } else { |
| 455 | _emit(cond, ARM_MOV_I(ARM_R0, 0), ctx); |
| 456 | _emit(cond, ARM_B(b_imm(ctx->skf->len, ctx)), ctx); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | static inline void emit_blx_r(u8 tgt_reg, struct jit_ctx *ctx) |
| 461 | { |
| 462 | #if __LINUX_ARM_ARCH__ < 5 |
| 463 | emit(ARM_MOV_R(ARM_LR, ARM_PC), ctx); |
| 464 | |
| 465 | if (elf_hwcap & HWCAP_THUMB) |
| 466 | emit(ARM_BX(tgt_reg), ctx); |
| 467 | else |
| 468 | emit(ARM_MOV_R(ARM_PC, tgt_reg), ctx); |
| 469 | #else |
| 470 | emit(ARM_BLX_R(tgt_reg), ctx); |
| 471 | #endif |
| 472 | } |
| 473 | |
| 474 | static inline void emit_udiv(u8 rd, u8 rm, u8 rn, struct jit_ctx *ctx) |
| 475 | { |
| 476 | #if __LINUX_ARM_ARCH__ == 7 |
| 477 | if (elf_hwcap & HWCAP_IDIVA) { |
| 478 | emit(ARM_UDIV(rd, rm, rn), ctx); |
| 479 | return; |
| 480 | } |
| 481 | #endif |
Nicolas Schichan | 19fc99d | 2015-05-06 18:31:56 +0200 | [diff] [blame] | 482 | |
| 483 | /* |
| 484 | * For BPF_ALU | BPF_DIV | BPF_K instructions, rm is ARM_R4 |
| 485 | * (r_A) and rn is ARM_R0 (r_scratch) so load rn first into |
| 486 | * ARM_R1 to avoid accidentally overwriting ARM_R0 with rm |
| 487 | * before using it as a source for ARM_R1. |
| 488 | * |
| 489 | * For BPF_ALU | BPF_DIV | BPF_X rm is ARM_R4 (r_A) and rn is |
| 490 | * ARM_R5 (r_X) so there is no particular register overlap |
| 491 | * issues. |
| 492 | */ |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 493 | if (rn != ARM_R1) |
| 494 | emit(ARM_MOV_R(ARM_R1, rn), ctx); |
Nicolas Schichan | 19fc99d | 2015-05-06 18:31:56 +0200 | [diff] [blame] | 495 | if (rm != ARM_R0) |
| 496 | emit(ARM_MOV_R(ARM_R0, rm), ctx); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 497 | |
| 498 | ctx->seen |= SEEN_CALL; |
| 499 | emit_mov_i(ARM_R3, (u32)jit_udiv, ctx); |
| 500 | emit_blx_r(ARM_R3, ctx); |
| 501 | |
| 502 | if (rd != ARM_R0) |
| 503 | emit(ARM_MOV_R(rd, ARM_R0), ctx); |
| 504 | } |
| 505 | |
| 506 | static inline void update_on_xread(struct jit_ctx *ctx) |
| 507 | { |
| 508 | if (!(ctx->seen & SEEN_X)) |
| 509 | ctx->flags |= FLAG_NEED_X_RESET; |
| 510 | |
| 511 | ctx->seen |= SEEN_X; |
| 512 | } |
| 513 | |
| 514 | static int build_body(struct jit_ctx *ctx) |
| 515 | { |
| 516 | void *load_func[] = {jit_get_skb_b, jit_get_skb_h, jit_get_skb_w}; |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 517 | const struct bpf_prog *prog = ctx->skf; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 518 | const struct sock_filter *inst; |
| 519 | unsigned i, load_order, off, condt; |
| 520 | int imm12; |
| 521 | u32 k; |
| 522 | |
| 523 | for (i = 0; i < prog->len; i++) { |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 524 | u16 code; |
| 525 | |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 526 | inst = &(prog->insns[i]); |
| 527 | /* K as an immediate value operand */ |
| 528 | k = inst->k; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 529 | code = bpf_anc_helper(inst); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 530 | |
| 531 | /* compute offsets only in the fake pass */ |
| 532 | if (ctx->target == NULL) |
| 533 | ctx->offsets[i] = ctx->idx * 4; |
| 534 | |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 535 | switch (code) { |
| 536 | case BPF_LD | BPF_IMM: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 537 | emit_mov_i(r_A, k, ctx); |
| 538 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 539 | case BPF_LD | BPF_W | BPF_LEN: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 540 | ctx->seen |= SEEN_SKB; |
| 541 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, len) != 4); |
| 542 | emit(ARM_LDR_I(r_A, r_skb, |
| 543 | offsetof(struct sk_buff, len)), ctx); |
| 544 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 545 | case BPF_LD | BPF_MEM: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 546 | /* A = scratch[k] */ |
| 547 | ctx->seen |= SEEN_MEM_WORD(k); |
| 548 | emit(ARM_LDR_I(r_A, ARM_SP, SCRATCH_OFF(k)), ctx); |
| 549 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 550 | case BPF_LD | BPF_W | BPF_ABS: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 551 | load_order = 2; |
| 552 | goto load; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 553 | case BPF_LD | BPF_H | BPF_ABS: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 554 | load_order = 1; |
| 555 | goto load; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 556 | case BPF_LD | BPF_B | BPF_ABS: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 557 | load_order = 0; |
| 558 | load: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 559 | emit_mov_i(r_off, k, ctx); |
| 560 | load_common: |
| 561 | ctx->seen |= SEEN_DATA | SEEN_CALL; |
| 562 | |
| 563 | if (load_order > 0) { |
| 564 | emit(ARM_SUB_I(r_scratch, r_skb_hl, |
| 565 | 1 << load_order), ctx); |
| 566 | emit(ARM_CMP_R(r_scratch, r_off), ctx); |
Nicolas Schichan | 7aed35c | 2015-07-21 14:14:12 +0200 | [diff] [blame] | 567 | condt = ARM_COND_GE; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 568 | } else { |
| 569 | emit(ARM_CMP_R(r_skb_hl, r_off), ctx); |
| 570 | condt = ARM_COND_HI; |
| 571 | } |
| 572 | |
Nicolas Schichan | 6d715e3 | 2015-07-21 14:14:13 +0200 | [diff] [blame] | 573 | /* |
| 574 | * test for negative offset, only if we are |
| 575 | * currently scheduled to take the fast |
| 576 | * path. this will update the flags so that |
| 577 | * the slowpath instruction are ignored if the |
| 578 | * offset is negative. |
| 579 | * |
| 580 | * for loard_order == 0 the HI condition will |
| 581 | * make loads at offset 0 take the slow path too. |
| 582 | */ |
| 583 | _emit(condt, ARM_CMP_I(r_off, 0), ctx); |
| 584 | |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 585 | _emit(condt, ARM_ADD_R(r_scratch, r_off, r_skb_data), |
| 586 | ctx); |
| 587 | |
| 588 | if (load_order == 0) |
| 589 | _emit(condt, ARM_LDRB_I(r_A, r_scratch, 0), |
| 590 | ctx); |
| 591 | else if (load_order == 1) |
| 592 | emit_load_be16(condt, r_A, r_scratch, ctx); |
| 593 | else if (load_order == 2) |
| 594 | emit_load_be32(condt, r_A, r_scratch, ctx); |
| 595 | |
| 596 | _emit(condt, ARM_B(b_imm(i + 1, ctx)), ctx); |
| 597 | |
| 598 | /* the slowpath */ |
| 599 | emit_mov_i(ARM_R3, (u32)load_func[load_order], ctx); |
| 600 | emit(ARM_MOV_R(ARM_R0, r_skb), ctx); |
| 601 | /* the offset is already in R1 */ |
| 602 | emit_blx_r(ARM_R3, ctx); |
| 603 | /* check the result of skb_copy_bits */ |
| 604 | emit(ARM_CMP_I(ARM_R1, 0), ctx); |
| 605 | emit_err_ret(ARM_COND_NE, ctx); |
| 606 | emit(ARM_MOV_R(r_A, ARM_R0), ctx); |
| 607 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 608 | case BPF_LD | BPF_W | BPF_IND: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 609 | load_order = 2; |
| 610 | goto load_ind; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 611 | case BPF_LD | BPF_H | BPF_IND: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 612 | load_order = 1; |
| 613 | goto load_ind; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 614 | case BPF_LD | BPF_B | BPF_IND: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 615 | load_order = 0; |
| 616 | load_ind: |
| 617 | OP_IMM3(ARM_ADD, r_off, r_X, k, ctx); |
| 618 | goto load_common; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 619 | case BPF_LDX | BPF_IMM: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 620 | ctx->seen |= SEEN_X; |
| 621 | emit_mov_i(r_X, k, ctx); |
| 622 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 623 | case BPF_LDX | BPF_W | BPF_LEN: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 624 | ctx->seen |= SEEN_X | SEEN_SKB; |
| 625 | emit(ARM_LDR_I(r_X, r_skb, |
| 626 | offsetof(struct sk_buff, len)), ctx); |
| 627 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 628 | case BPF_LDX | BPF_MEM: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 629 | ctx->seen |= SEEN_X | SEEN_MEM_WORD(k); |
| 630 | emit(ARM_LDR_I(r_X, ARM_SP, SCRATCH_OFF(k)), ctx); |
| 631 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 632 | case BPF_LDX | BPF_B | BPF_MSH: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 633 | /* x = ((*(frame + k)) & 0xf) << 2; */ |
| 634 | ctx->seen |= SEEN_X | SEEN_DATA | SEEN_CALL; |
| 635 | /* the interpreter should deal with the negative K */ |
Chen Gang | 45549a6 | 2013-03-10 10:15:54 +0800 | [diff] [blame] | 636 | if ((int)k < 0) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 637 | return -1; |
| 638 | /* offset in r1: we might have to take the slow path */ |
| 639 | emit_mov_i(r_off, k, ctx); |
| 640 | emit(ARM_CMP_R(r_skb_hl, r_off), ctx); |
| 641 | |
| 642 | /* load in r0: common with the slowpath */ |
| 643 | _emit(ARM_COND_HI, ARM_LDRB_R(ARM_R0, r_skb_data, |
| 644 | ARM_R1), ctx); |
| 645 | /* |
| 646 | * emit_mov_i() might generate one or two instructions, |
| 647 | * the same holds for emit_blx_r() |
| 648 | */ |
| 649 | _emit(ARM_COND_HI, ARM_B(b_imm(i + 1, ctx) - 2), ctx); |
| 650 | |
| 651 | emit(ARM_MOV_R(ARM_R0, r_skb), ctx); |
| 652 | /* r_off is r1 */ |
| 653 | emit_mov_i(ARM_R3, (u32)jit_get_skb_b, ctx); |
| 654 | emit_blx_r(ARM_R3, ctx); |
| 655 | /* check the return value of skb_copy_bits */ |
| 656 | emit(ARM_CMP_I(ARM_R1, 0), ctx); |
| 657 | emit_err_ret(ARM_COND_NE, ctx); |
| 658 | |
| 659 | emit(ARM_AND_I(r_X, ARM_R0, 0x00f), ctx); |
| 660 | emit(ARM_LSL_I(r_X, r_X, 2), ctx); |
| 661 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 662 | case BPF_ST: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 663 | ctx->seen |= SEEN_MEM_WORD(k); |
| 664 | emit(ARM_STR_I(r_A, ARM_SP, SCRATCH_OFF(k)), ctx); |
| 665 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 666 | case BPF_STX: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 667 | update_on_xread(ctx); |
| 668 | ctx->seen |= SEEN_MEM_WORD(k); |
| 669 | emit(ARM_STR_I(r_X, ARM_SP, SCRATCH_OFF(k)), ctx); |
| 670 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 671 | case BPF_ALU | BPF_ADD | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 672 | /* A += K */ |
| 673 | OP_IMM3(ARM_ADD, r_A, r_A, k, ctx); |
| 674 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 675 | case BPF_ALU | BPF_ADD | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 676 | update_on_xread(ctx); |
| 677 | emit(ARM_ADD_R(r_A, r_A, r_X), ctx); |
| 678 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 679 | case BPF_ALU | BPF_SUB | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 680 | /* A -= K */ |
| 681 | OP_IMM3(ARM_SUB, r_A, r_A, k, ctx); |
| 682 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 683 | case BPF_ALU | BPF_SUB | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 684 | update_on_xread(ctx); |
| 685 | emit(ARM_SUB_R(r_A, r_A, r_X), ctx); |
| 686 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 687 | case BPF_ALU | BPF_MUL | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 688 | /* A *= K */ |
| 689 | emit_mov_i(r_scratch, k, ctx); |
| 690 | emit(ARM_MUL(r_A, r_A, r_scratch), ctx); |
| 691 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 692 | case BPF_ALU | BPF_MUL | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 693 | update_on_xread(ctx); |
| 694 | emit(ARM_MUL(r_A, r_A, r_X), ctx); |
| 695 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 696 | case BPF_ALU | BPF_DIV | BPF_K: |
Eric Dumazet | aee636c | 2014-01-15 06:50:07 -0800 | [diff] [blame] | 697 | if (k == 1) |
| 698 | break; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 699 | emit_mov_i(r_scratch, k, ctx); |
Eric Dumazet | aee636c | 2014-01-15 06:50:07 -0800 | [diff] [blame] | 700 | emit_udiv(r_A, r_A, r_scratch, ctx); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 701 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 702 | case BPF_ALU | BPF_DIV | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 703 | update_on_xread(ctx); |
| 704 | emit(ARM_CMP_I(r_X, 0), ctx); |
| 705 | emit_err_ret(ARM_COND_EQ, ctx); |
| 706 | emit_udiv(r_A, r_A, r_X, ctx); |
| 707 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 708 | case BPF_ALU | BPF_OR | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 709 | /* A |= K */ |
| 710 | OP_IMM3(ARM_ORR, r_A, r_A, k, ctx); |
| 711 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 712 | case BPF_ALU | BPF_OR | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 713 | update_on_xread(ctx); |
| 714 | emit(ARM_ORR_R(r_A, r_A, r_X), ctx); |
| 715 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 716 | case BPF_ALU | BPF_XOR | BPF_K: |
Daniel Borkmann | 3cbe204 | 2012-11-07 15:28:28 +0000 | [diff] [blame] | 717 | /* A ^= K; */ |
| 718 | OP_IMM3(ARM_EOR, r_A, r_A, k, ctx); |
| 719 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 720 | case BPF_ANC | SKF_AD_ALU_XOR_X: |
| 721 | case BPF_ALU | BPF_XOR | BPF_X: |
Daniel Borkmann | 3cbe204 | 2012-11-07 15:28:28 +0000 | [diff] [blame] | 722 | /* A ^= X */ |
| 723 | update_on_xread(ctx); |
| 724 | emit(ARM_EOR_R(r_A, r_A, r_X), ctx); |
| 725 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 726 | case BPF_ALU | BPF_AND | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 727 | /* A &= K */ |
| 728 | OP_IMM3(ARM_AND, r_A, r_A, k, ctx); |
| 729 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 730 | case BPF_ALU | BPF_AND | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 731 | update_on_xread(ctx); |
| 732 | emit(ARM_AND_R(r_A, r_A, r_X), ctx); |
| 733 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 734 | case BPF_ALU | BPF_LSH | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 735 | if (unlikely(k > 31)) |
| 736 | return -1; |
| 737 | emit(ARM_LSL_I(r_A, r_A, k), ctx); |
| 738 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 739 | case BPF_ALU | BPF_LSH | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 740 | update_on_xread(ctx); |
| 741 | emit(ARM_LSL_R(r_A, r_A, r_X), ctx); |
| 742 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 743 | case BPF_ALU | BPF_RSH | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 744 | if (unlikely(k > 31)) |
| 745 | return -1; |
| 746 | emit(ARM_LSR_I(r_A, r_A, k), ctx); |
| 747 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 748 | case BPF_ALU | BPF_RSH | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 749 | update_on_xread(ctx); |
| 750 | emit(ARM_LSR_R(r_A, r_A, r_X), ctx); |
| 751 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 752 | case BPF_ALU | BPF_NEG: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 753 | /* A = -A */ |
| 754 | emit(ARM_RSB_I(r_A, r_A, 0), ctx); |
| 755 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 756 | case BPF_JMP | BPF_JA: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 757 | /* pc += K */ |
| 758 | emit(ARM_B(b_imm(i + k + 1, ctx)), ctx); |
| 759 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 760 | case BPF_JMP | BPF_JEQ | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 761 | /* pc += (A == K) ? pc->jt : pc->jf */ |
| 762 | condt = ARM_COND_EQ; |
| 763 | goto cmp_imm; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 764 | case BPF_JMP | BPF_JGT | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 765 | /* pc += (A > K) ? pc->jt : pc->jf */ |
| 766 | condt = ARM_COND_HI; |
| 767 | goto cmp_imm; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 768 | case BPF_JMP | BPF_JGE | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 769 | /* pc += (A >= K) ? pc->jt : pc->jf */ |
| 770 | condt = ARM_COND_HS; |
| 771 | cmp_imm: |
| 772 | imm12 = imm8m(k); |
| 773 | if (imm12 < 0) { |
| 774 | emit_mov_i_no8m(r_scratch, k, ctx); |
| 775 | emit(ARM_CMP_R(r_A, r_scratch), ctx); |
| 776 | } else { |
| 777 | emit(ARM_CMP_I(r_A, imm12), ctx); |
| 778 | } |
| 779 | cond_jump: |
| 780 | if (inst->jt) |
| 781 | _emit(condt, ARM_B(b_imm(i + inst->jt + 1, |
| 782 | ctx)), ctx); |
| 783 | if (inst->jf) |
| 784 | _emit(condt ^ 1, ARM_B(b_imm(i + inst->jf + 1, |
| 785 | ctx)), ctx); |
| 786 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 787 | case BPF_JMP | BPF_JEQ | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 788 | /* pc += (A == X) ? pc->jt : pc->jf */ |
| 789 | condt = ARM_COND_EQ; |
| 790 | goto cmp_x; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 791 | case BPF_JMP | BPF_JGT | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 792 | /* pc += (A > X) ? pc->jt : pc->jf */ |
| 793 | condt = ARM_COND_HI; |
| 794 | goto cmp_x; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 795 | case BPF_JMP | BPF_JGE | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 796 | /* pc += (A >= X) ? pc->jt : pc->jf */ |
| 797 | condt = ARM_COND_CS; |
| 798 | cmp_x: |
| 799 | update_on_xread(ctx); |
| 800 | emit(ARM_CMP_R(r_A, r_X), ctx); |
| 801 | goto cond_jump; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 802 | case BPF_JMP | BPF_JSET | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 803 | /* pc += (A & K) ? pc->jt : pc->jf */ |
| 804 | condt = ARM_COND_NE; |
| 805 | /* not set iff all zeroes iff Z==1 iff EQ */ |
| 806 | |
| 807 | imm12 = imm8m(k); |
| 808 | if (imm12 < 0) { |
| 809 | emit_mov_i_no8m(r_scratch, k, ctx); |
| 810 | emit(ARM_TST_R(r_A, r_scratch), ctx); |
| 811 | } else { |
| 812 | emit(ARM_TST_I(r_A, imm12), ctx); |
| 813 | } |
| 814 | goto cond_jump; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 815 | case BPF_JMP | BPF_JSET | BPF_X: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 816 | /* pc += (A & X) ? pc->jt : pc->jf */ |
| 817 | update_on_xread(ctx); |
| 818 | condt = ARM_COND_NE; |
| 819 | emit(ARM_TST_R(r_A, r_X), ctx); |
| 820 | goto cond_jump; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 821 | case BPF_RET | BPF_A: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 822 | emit(ARM_MOV_R(ARM_R0, r_A), ctx); |
| 823 | goto b_epilogue; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 824 | case BPF_RET | BPF_K: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 825 | if ((k == 0) && (ctx->ret0_fp_idx < 0)) |
| 826 | ctx->ret0_fp_idx = i; |
| 827 | emit_mov_i(ARM_R0, k, ctx); |
| 828 | b_epilogue: |
| 829 | if (i != ctx->skf->len - 1) |
| 830 | emit(ARM_B(b_imm(prog->len, ctx)), ctx); |
| 831 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 832 | case BPF_MISC | BPF_TAX: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 833 | /* X = A */ |
| 834 | ctx->seen |= SEEN_X; |
| 835 | emit(ARM_MOV_R(r_X, r_A), ctx); |
| 836 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 837 | case BPF_MISC | BPF_TXA: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 838 | /* A = X */ |
| 839 | update_on_xread(ctx); |
| 840 | emit(ARM_MOV_R(r_A, r_X), ctx); |
| 841 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 842 | case BPF_ANC | SKF_AD_PROTOCOL: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 843 | /* A = ntohs(skb->protocol) */ |
| 844 | ctx->seen |= SEEN_SKB; |
| 845 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, |
| 846 | protocol) != 2); |
| 847 | off = offsetof(struct sk_buff, protocol); |
| 848 | emit(ARM_LDRH_I(r_scratch, r_skb, off), ctx); |
| 849 | emit_swap16(r_A, r_scratch, ctx); |
| 850 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 851 | case BPF_ANC | SKF_AD_CPU: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 852 | /* r_scratch = current_thread_info() */ |
| 853 | OP_IMM3(ARM_BIC, r_scratch, ARM_SP, THREAD_SIZE - 1, ctx); |
| 854 | /* A = current_thread_info()->cpu */ |
| 855 | BUILD_BUG_ON(FIELD_SIZEOF(struct thread_info, cpu) != 4); |
| 856 | off = offsetof(struct thread_info, cpu); |
| 857 | emit(ARM_LDR_I(r_A, r_scratch, off), ctx); |
| 858 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 859 | case BPF_ANC | SKF_AD_IFINDEX: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 860 | /* A = skb->dev->ifindex */ |
| 861 | ctx->seen |= SEEN_SKB; |
| 862 | off = offsetof(struct sk_buff, dev); |
| 863 | emit(ARM_LDR_I(r_scratch, r_skb, off), ctx); |
| 864 | |
| 865 | emit(ARM_CMP_I(r_scratch, 0), ctx); |
| 866 | emit_err_ret(ARM_COND_EQ, ctx); |
| 867 | |
| 868 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, |
| 869 | ifindex) != 4); |
| 870 | off = offsetof(struct net_device, ifindex); |
| 871 | emit(ARM_LDR_I(r_A, r_scratch, off), ctx); |
| 872 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 873 | case BPF_ANC | SKF_AD_MARK: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 874 | ctx->seen |= SEEN_SKB; |
| 875 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); |
| 876 | off = offsetof(struct sk_buff, mark); |
| 877 | emit(ARM_LDR_I(r_A, r_skb, off), ctx); |
| 878 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 879 | case BPF_ANC | SKF_AD_RXHASH: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 880 | ctx->seen |= SEEN_SKB; |
Tom Herbert | 61b905d | 2014-03-24 15:34:47 -0700 | [diff] [blame] | 881 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); |
| 882 | off = offsetof(struct sk_buff, hash); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 883 | emit(ARM_LDR_I(r_A, r_skb, off), ctx); |
| 884 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 885 | case BPF_ANC | SKF_AD_VLAN_TAG: |
| 886 | case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT: |
Daniel Borkmann | bf0098f | 2012-11-07 15:31:02 +0000 | [diff] [blame] | 887 | ctx->seen |= SEEN_SKB; |
| 888 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); |
| 889 | off = offsetof(struct sk_buff, vlan_tci); |
| 890 | emit(ARM_LDRH_I(r_A, r_skb, off), ctx); |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 891 | if (code == (BPF_ANC | SKF_AD_VLAN_TAG)) |
Nicolas Schichan | c18fe54 | 2015-07-21 14:14:14 +0200 | [diff] [blame] | 892 | OP_IMM3(ARM_AND, r_A, r_A, ~VLAN_TAG_PRESENT, ctx); |
| 893 | else { |
| 894 | OP_IMM3(ARM_LSR, r_A, r_A, 12, ctx); |
| 895 | OP_IMM3(ARM_AND, r_A, r_A, 0x1, ctx); |
| 896 | } |
Daniel Borkmann | bf0098f | 2012-11-07 15:31:02 +0000 | [diff] [blame] | 897 | break; |
Daniel Borkmann | 3480593 | 2014-05-29 10:22:50 +0200 | [diff] [blame] | 898 | case BPF_ANC | SKF_AD_QUEUE: |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 899 | ctx->seen |= SEEN_SKB; |
| 900 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, |
| 901 | queue_mapping) != 2); |
| 902 | BUILD_BUG_ON(offsetof(struct sk_buff, |
| 903 | queue_mapping) > 0xff); |
| 904 | off = offsetof(struct sk_buff, queue_mapping); |
| 905 | emit(ARM_LDRH_I(r_A, r_skb, off), ctx); |
| 906 | break; |
Nicolas Schichan | 24e737c | 2015-05-07 15:00:13 +0200 | [diff] [blame] | 907 | case BPF_LDX | BPF_W | BPF_ABS: |
| 908 | /* |
| 909 | * load a 32bit word from struct seccomp_data. |
| 910 | * seccomp_check_filter() will already have checked |
| 911 | * that k is 32bit aligned and lies within the |
| 912 | * struct seccomp_data. |
| 913 | */ |
| 914 | ctx->seen |= SEEN_SKB; |
| 915 | emit(ARM_LDR_I(r_A, r_skb, k), ctx); |
| 916 | break; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 917 | default: |
| 918 | return -1; |
| 919 | } |
Nicolas Schichan | 0b59d88 | 2015-05-07 17:14:21 +0200 | [diff] [blame] | 920 | |
| 921 | if (ctx->flags & FLAG_IMM_OVERFLOW) |
| 922 | /* |
| 923 | * this instruction generated an overflow when |
| 924 | * trying to access the literal pool, so |
| 925 | * delegate this filter to the kernel interpreter. |
| 926 | */ |
| 927 | return -1; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | /* compute offsets only during the first pass */ |
| 931 | if (ctx->target == NULL) |
| 932 | ctx->offsets[i] = ctx->idx * 4; |
| 933 | |
| 934 | return 0; |
| 935 | } |
| 936 | |
| 937 | |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 938 | void bpf_jit_compile(struct bpf_prog *fp) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 939 | { |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 940 | struct bpf_binary_header *header; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 941 | struct jit_ctx ctx; |
| 942 | unsigned tmp_idx; |
| 943 | unsigned alloc_size; |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 944 | u8 *target_ptr; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 945 | |
| 946 | if (!bpf_jit_enable) |
| 947 | return; |
| 948 | |
| 949 | memset(&ctx, 0, sizeof(ctx)); |
| 950 | ctx.skf = fp; |
| 951 | ctx.ret0_fp_idx = -1; |
| 952 | |
Schichan Nicolas | 89c2e00 | 2012-12-10 14:49:39 +0100 | [diff] [blame] | 953 | ctx.offsets = kzalloc(4 * (ctx.skf->len + 1), GFP_KERNEL); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 954 | if (ctx.offsets == NULL) |
| 955 | return; |
| 956 | |
| 957 | /* fake pass to fill in the ctx->seen */ |
| 958 | if (unlikely(build_body(&ctx))) |
| 959 | goto out; |
| 960 | |
| 961 | tmp_idx = ctx.idx; |
| 962 | build_prologue(&ctx); |
| 963 | ctx.prologue_bytes = (ctx.idx - tmp_idx) * 4; |
| 964 | |
| 965 | #if __LINUX_ARM_ARCH__ < 7 |
| 966 | tmp_idx = ctx.idx; |
| 967 | build_epilogue(&ctx); |
| 968 | ctx.epilogue_bytes = (ctx.idx - tmp_idx) * 4; |
| 969 | |
| 970 | ctx.idx += ctx.imm_count; |
| 971 | if (ctx.imm_count) { |
Schichan Nicolas | 89c2e00 | 2012-12-10 14:49:39 +0100 | [diff] [blame] | 972 | ctx.imms = kzalloc(4 * ctx.imm_count, GFP_KERNEL); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 973 | if (ctx.imms == NULL) |
| 974 | goto out; |
| 975 | } |
| 976 | #else |
| 977 | /* there's nothing after the epilogue on ARMv7 */ |
| 978 | build_epilogue(&ctx); |
| 979 | #endif |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 980 | alloc_size = 4 * ctx.idx; |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 981 | header = bpf_jit_binary_alloc(alloc_size, &target_ptr, |
| 982 | 4, jit_fill_hole); |
| 983 | if (header == NULL) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 984 | goto out; |
| 985 | |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 986 | ctx.target = (u32 *) target_ptr; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 987 | ctx.idx = 0; |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 988 | |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 989 | build_prologue(&ctx); |
Nicolas Schichan | 0b59d88 | 2015-05-07 17:14:21 +0200 | [diff] [blame] | 990 | if (build_body(&ctx) < 0) { |
| 991 | #if __LINUX_ARM_ARCH__ < 7 |
| 992 | if (ctx.imm_count) |
| 993 | kfree(ctx.imms); |
| 994 | #endif |
| 995 | bpf_jit_binary_free(header); |
| 996 | goto out; |
| 997 | } |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 998 | build_epilogue(&ctx); |
| 999 | |
| 1000 | flush_icache_range((u32)ctx.target, (u32)(ctx.target + ctx.idx)); |
| 1001 | |
| 1002 | #if __LINUX_ARM_ARCH__ < 7 |
| 1003 | if (ctx.imm_count) |
| 1004 | kfree(ctx.imms); |
| 1005 | #endif |
| 1006 | |
| 1007 | if (bpf_jit_enable > 1) |
Daniel Borkmann | 7961780 | 2013-03-21 22:22:03 +0100 | [diff] [blame] | 1008 | /* there are 2 passes here */ |
| 1009 | bpf_jit_dump(fp->len, alloc_size, 2, ctx.target); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 1010 | |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 1011 | set_memory_ro((unsigned long)header, header->pages); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 1012 | fp->bpf_func = (void *)ctx.target; |
Daniel Borkmann | 286aad3 | 2014-09-08 08:04:49 +0200 | [diff] [blame] | 1013 | fp->jited = true; |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 1014 | out: |
| 1015 | kfree(ctx.offsets); |
| 1016 | return; |
| 1017 | } |
| 1018 | |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 1019 | void bpf_jit_free(struct bpf_prog *fp) |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 1020 | { |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 1021 | unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK; |
| 1022 | struct bpf_binary_header *header = (void *)addr; |
Daniel Borkmann | 60a3b22 | 2014-09-02 22:53:44 +0200 | [diff] [blame] | 1023 | |
Daniel Borkmann | 55309dd | 2014-09-08 08:04:48 +0200 | [diff] [blame] | 1024 | if (!fp->jited) |
| 1025 | goto free_filter; |
| 1026 | |
| 1027 | set_memory_rw(addr, header->pages); |
| 1028 | bpf_jit_binary_free(header); |
| 1029 | |
| 1030 | free_filter: |
Daniel Borkmann | 60a3b22 | 2014-09-02 22:53:44 +0200 | [diff] [blame] | 1031 | bpf_prog_unlock_free(fp); |
Mircea Gherzan | ddecdfc | 2012-03-16 13:37:12 +0100 | [diff] [blame] | 1032 | } |