/* * Linux Socket Filter - Kernel level socket filtering * * Based on the design of the Berkeley Packet Filter. The new * internal format has been designed by PLUMgrid: * * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com * * Authors: * * Jay Schulist <jschlst@samba.org> * Alexei Starovoitov <ast@plumgrid.com> * Daniel Borkmann <dborkman@redhat.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Andi Kleen - Fix a few bad bugs and races. * Kris Katterjohn - Added many additional checks in bpf_check_classic() */ #include <linux/filter.h>#include <linux/skbuff.h>#include <linux/vmalloc.h>#include <linux/random.h>#include <linux/moduleloader.h>#include <asm/unaligned.h>#include <linux/bpf.h> /* Registers */#define BPF_R0 regs[BPF_REG_0]#define BPF_R1 regs[BPF_REG_1]#define BPF_R2 regs[BPF_REG_2]#define BPF_R3 regs[BPF_REG_3]#define BPF_R4 regs[BPF_REG_4]#define BPF_R5 regs[BPF_REG_5]#define BPF_R6 regs[BPF_REG_6]#define BPF_R7 regs[BPF_REG_7]#define BPF_R8 regs[BPF_REG_8]#define BPF_R9 regs[BPF_REG_9]#define BPF_R10 regs[BPF_REG_10] /* Named registers */#define DST regs[insn->dst_reg]#define SRC regs[insn->src_reg]#define FP regs[BPF_REG_FP]#define ARG1 regs[BPF_REG_ARG1]#define CTX regs[BPF_REG_CTX]#define IMM insn->imm /* No hurry in this branch * * Exported for the bpf jit load helper. */void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, int k, unsigned int size){ u8 *ptr = NULL; if (k >= SKF_NET_OFF) ptr = skb_network_header(skb) + k - SKF_NET_OFF; else if (k >= SKF_LL_OFF) ptr = skb_mac_header(skb) + k - SKF_LL_OFF; if (ptr >= skb->head && ptr + size <= skb_tail_pointer(skb)) return ptr; return NULL;} struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags){ gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO | gfp_extra_flags; struct bpf_prog_aux *aux; struct bpf_prog *fp; size = round_up(size, PAGE_SIZE); fp = __vmalloc(size, gfp_flags, PAGE_KERNEL); if (fp == NULL) return NULL; aux = kzalloc(sizeof(*aux), GFP_KERNEL | gfp_extra_flags); if (aux == NULL) { vfree(fp); return NULL; } fp->pages = size / PAGE_SIZE; fp->aux = aux; return fp;}EXPORT_SYMBOL_GPL(bpf_prog_alloc); struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, gfp_t gfp_extra_flags){ gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO | gfp_extra_flags; struct bpf_prog *fp; BUG_ON(fp_old == NULL); size = round_up(size, PAGE_SIZE); if (size <= fp_old->pages * PAGE_SIZE) return fp_old; fp = __vmalloc(size, gfp_flags, PAGE_KERNEL); if (fp != NULL) { memcpy(fp, fp_old, fp_old->pages * PAGE_SIZE); fp->pages = size / PAGE_SIZE; /* We keep fp->aux from fp_old around in the new * reallocated structure. */ fp_old->aux = NULL; __bpf_prog_free(fp_old); } return fp;}EXPORT_SYMBOL_GPL(bpf_prog_realloc); void __bpf_prog_free(struct bpf_prog *fp){ kfree(fp->aux); vfree(fp);}EXPORT_SYMBOL_GPL(__bpf_prog_free); #ifdef CONFIG_BPF_JITstruct bpf_binary_header *bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, unsigned int alignment, bpf_jit_fill_hole_t bpf_fill_ill_insns){ struct bpf_binary_header *hdr; unsigned int size, hole, start; /* Most of BPF filters are really small, but if some of them * fill a page, allow at least 128 extra bytes to insert a * random section of illegal instructions. */ size = round_up(proglen + sizeof(*hdr) + 128, PAGE_SIZE); hdr = module_alloc(size); if (hdr == NULL) return NULL; /* Fill space with illegal/arch-dep instructions. */ bpf_fill_ill_insns(hdr, size); hdr->pages = size / PAGE_SIZE; hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)), PAGE_SIZE - sizeof(*hdr)); start = (prandom_u32() % hole) & ~(alignment - 1); /* Leave a random number of instructions before BPF code. */ *image_ptr = &hdr->image[start]; return hdr;} void bpf_jit_binary_free(struct bpf_binary_header *hdr){ module_memfree(hdr);}#endif /* CONFIG_BPF_JIT */ /* Base function for offset calculation. Needs to go into .text section, * therefore keeping it non-static as well; will also be used by JITs * anyway later on, so do not let the compiler omit it. */noinline u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5){ return 0;} /** * __bpf_prog_run - run eBPF program on a given context * @ctx: is the data we are operating on * @insn: is the array of eBPF instructions * * Decode and execute eBPF instructions. */static unsigned int __bpf_prog_run(void *ctx, const struct bpf_insn *insn){ u64 stack[MAX_BPF_STACK / sizeof(u64)]; u64 regs[MAX_BPF_REG], tmp; static const void *jumptable[256] = { [0 ... 255] = &&default_label, /* Now overwrite non-defaults ... */ /* 32 bit ALU operations */ [BPF_ALU | BPF_ADD | BPF_X] = &&ALU_ADD_X, [BPF_ALU | BPF_ADD | BPF_K] = &&ALU_ADD_K, [BPF_ALU | BPF_SUB | BPF_X] = &&ALU_SUB_X, [BPF_ALU | BPF_SUB | BPF_K] = &&ALU_SUB_K, [BPF_ALU | BPF_AND | BPF_X] = &&ALU_AND_X, [BPF_ALU | BPF_AND | BPF_K] = &&ALU_AND_K, [BPF_ALU | BPF_OR | BPF_X] = &&ALU_OR_X, [BPF_ALU | BPF_OR | BPF_K] = &&ALU_OR_K, [BPF_ALU | BPF_LSH | BPF_X] = &&ALU_LSH_X, [BPF_ALU | BPF_LSH | BPF_K] = &&ALU_LSH_K, [BPF_ALU | BPF_RSH | BPF_X] = &&ALU_RSH_X, [BPF_ALU | BPF_RSH | BPF_K] = &&ALU_RSH_K, [BPF_ALU | BPF_XOR | BPF_X] = &&ALU_XOR_X, [BPF_ALU | BPF_XOR | BPF_K] = &&ALU_XOR_K, [BPF_ALU | BPF_MUL | BPF_X] = &&ALU_MUL_X, [BPF_ALU | BPF_MUL | BPF_K] = &&ALU_MUL_K, [BPF_ALU | BPF_MOV | BPF_X] = &&ALU_MOV_X, [BPF_ALU | BPF_MOV | BPF_K] = &&ALU_MOV_K, [BPF_ALU | BPF_DIV | BPF_X] = &&ALU_DIV_X, [BPF_ALU | BPF_DIV | BPF_K] = &&ALU_DIV_K, [BPF_ALU | BPF_MOD | BPF_X] = &&ALU_MOD_X, [BPF_ALU | BPF_MOD | BPF_K] = &&ALU_MOD_K, [BPF_ALU | BPF_NEG] = &&ALU_NEG, [BPF_ALU | BPF_END | BPF_TO_BE] = &&ALU_END_TO_BE, [BPF_ALU | BPF_END | BPF_TO_LE] = &&ALU_END_TO_LE, /* 64 bit ALU operations */ [BPF_ALU64 | BPF_ADD | BPF_X] = &&ALU64_ADD_X, [BPF_ALU64 | BPF_ADD | BPF_K] = &&ALU64_ADD_K, [BPF_ALU64 | BPF_SUB | BPF_X] = &&ALU64_SUB_X, [BPF_ALU64 | BPF_SUB | BPF_K] = &&ALU64_SUB_K, [BPF_ALU64 | BPF_AND | BPF_X] = &&ALU64_AND_X, [BPF_ALU64 | BPF_AND | BPF_K] = &&ALU64_AND_K, [BPF_ALU64 | BPF_OR | BPF_X] = &&ALU64_OR_X, [BPF_ALU64 | BPF_OR | BPF_K] = &&ALU64_OR_K, [BPF_ALU64 | BPF_LSH | BPF_X] = &&ALU64_LSH_X, [BPF_ALU64 | BPF_LSH | BPF_K] = &&ALU64_LSH_K, [BPF_ALU64 | BPF_RSH | BPF_X] = &&ALU64_RSH_X, [BPF_ALU64 | BPF_RSH | BPF_K] = &&ALU64_RSH_K, [BPF_ALU64 | BPF_XOR | BPF_X] = &&ALU64_XOR_X, [BPF_ALU64 | BPF_XOR | BPF_K] = &&ALU64_XOR_K, [BPF_ALU64 | BPF_MUL | BPF_X] = &&ALU64_MUL_X, [BPF_ALU64 | BPF_MUL | BPF_K] = &&ALU64_MUL_K, [BPF_ALU64 | BPF_MOV | BPF_X] = &&ALU64_MOV_X, [BPF_ALU64 | BPF_MOV | BPF_K] = &&ALU64_MOV_K, [BPF_ALU64 | BPF_ARSH | BPF_X] = &&ALU64_ARSH_X, [BPF_ALU64 | BPF_ARSH | BPF_K] = &&ALU64_ARSH_K, [BPF_ALU64 | BPF_DIV | BPF_X] = &&ALU64_DIV_X, [BPF_ALU64 | BPF_DIV | BPF_K] = &&ALU64_DIV_K, [BPF_ALU64 | BPF_MOD | BPF_X] = &&ALU64_MOD_X, [BPF_ALU64 | BPF_MOD | BPF_K] = &&ALU64_MOD_K, [BPF_ALU64 | BPF_NEG] = &&ALU64_NEG, /* Call instruction */ [BPF_JMP | BPF_CALL] = &&JMP_CALL, /* Jumps */ [BPF_JMP | BPF_JA] = &&JMP_JA, [BPF_JMP | BPF_JEQ | BPF_X] = &&JMP_JEQ_X, [BPF_JMP | BPF_JEQ | BPF_K] = &&JMP_JEQ_K, [BPF_JMP | BPF_JNE | BPF_X] = &&JMP_JNE_X, [BPF_JMP | BPF_JNE | BPF_K] = &&JMP_JNE_K, [BPF_JMP | BPF_JGT | BPF_X] = &&JMP_JGT_X, [BPF_JMP | BPF_JGT | BPF_K] = &&JMP_JGT_K, [BPF_JMP | BPF_JGE | BPF_X] = &&JMP_JGE_X, [BPF_JMP | BPF_JGE | BPF_K] = &&JMP_JGE_K, [BPF_JMP | BPF_JSGT | BPF_X] = &&JMP_JSGT_X, [BPF_JMP | BPF_JSGT | BPF_K] = &&JMP_JSGT_K, [BPF_JMP | BPF_JSGE | BPF_X] = &&JMP_JSGE_X, [BPF_JMP | BPF_JSGE | BPF_K] = &&JMP_JSGE_K, [BPF_JMP | BPF_JSET | BPF_X] = &&JMP_JSET_X, [BPF_JMP | BPF_JSET | BPF_K] = &&JMP_JSET_K, /* Program return */ [BPF_JMP | BPF_EXIT] = &&JMP_EXIT, /* Store instructions */ [BPF_STX | BPF_MEM | BPF_B] = &&STX_MEM_B, [BPF_STX | BPF_MEM | BPF_H] = &&STX_MEM_H, [BPF_STX | BPF_MEM | BPF_W] = &&STX_MEM_W, [BPF_STX | BPF_MEM | BPF_DW] = &&STX_MEM_DW, [BPF_STX | BPF_XADD | BPF_W] = &&STX_XADD_W, [BPF_STX | BPF_XADD | BPF_DW] = &&STX_XADD_DW, [BPF_ST | BPF_MEM | BPF_B] = &&ST_MEM_B, [BPF_ST | BPF_MEM | BPF_H] = &&ST_MEM_H, [BPF_ST | BPF_MEM | BPF_W] = &&ST_MEM_W, [BPF_ST | BPF_MEM | BPF_DW] = &&ST_MEM_DW, /* Load instructions */ [BPF_LDX | BPF_MEM | BPF_B] = &&LDX_MEM_B, [BPF_LDX | BPF_MEM | BPF_H] = &&LDX_MEM_H, [BPF_LDX | BPF_MEM | BPF_W] = &&LDX_MEM_W, [BPF_LDX | BPF_MEM | BPF_DW] = &&LDX_MEM_DW, [BPF_LD | BPF_ABS | BPF_W] = &&LD_ABS_W, [BPF_LD | BPF_ABS | BPF_H] = &&LD_ABS_H, [BPF_LD | BPF_ABS | BPF_B] = &&LD_ABS_B, [BPF_LD | BPF_IND | BPF_W] = &&LD_IND_W, [BPF_LD | BPF_IND | BPF_H] = &&LD_IND_H, [BPF_LD | BPF_IND | BPF_B] = &&LD_IND_B, [BPF_LD | BPF_IMM | BPF_DW] = &&LD_IMM_DW, }; void *ptr; int off; #define CONT ({ insn++; goto select_insn; })#define CONT_JMP ({ insn++; goto select_insn; }) FP = (u64) (unsigned long) &stack[ARRAY_SIZE(stack)]; ARG1 = (u64) (unsigned long) ctx; /* Registers used in classic BPF programs need to be reset first. */ regs[BPF_REG_A] = 0; regs[BPF_REG_X] = 0; select_insn: goto *jumptable[insn->code]; /* ALU */#define ALU(OPCODE, OP) \ ALU64_##OPCODE##_X: \ DST = DST OP SRC; \ CONT; \ ALU_##OPCODE##_X: \ DST = (u32) DST OP (u32) SRC; \ CONT; \ ALU64_##OPCODE##_K: \ DST = DST OP IMM; \ CONT; \ ALU_##OPCODE##_K: \ DST = (u32) DST OP (u32) IMM; \ CONT; ALU(ADD, +) ALU(SUB, -) ALU(AND, &) ALU(OR, |) ALU(LSH, <<) ALU(RSH, >>) ALU(XOR, ^) ALU(MUL, *)#undef ALU ALU_NEG: DST = (u32) -DST; CONT; ALU64_NEG: DST = -DST; CONT; ALU_MOV_X: DST = (u32) SRC; CONT; ALU_MOV_K: DST = (u32) IMM; CONT; ALU64_MOV_X: DST = SRC; CONT; ALU64_MOV_K: DST = IMM; CONT; LD_IMM_DW: DST = (u64) (u32) insn[0].imm | ((u64) (u32) insn[1].imm) << 32; insn++; CONT; ALU64_ARSH_X: (*(s64 *) &DST) >>= SRC; CONT; ALU64_ARSH_K: (*(s64 *) &DST) >>= IMM; CONT; ALU64_MOD_X: if (unlikely(SRC == 0)) return 0; div64_u64_rem(DST, SRC, &tmp); DST = tmp; CONT; ALU_MOD_X: if (unlikely(SRC == 0)) return 0; tmp = (u32) DST; DST = do_div(tmp, (u32) SRC); CONT; ALU64_MOD_K: div64_u64_rem(DST, IMM, &tmp); DST = tmp; CONT; ALU_MOD_K: tmp = (u32) DST; DST = do_div(tmp, (u32) IMM); CONT; ALU64_DIV_X: if (unlikely(SRC == 0)) return 0; DST = div64_u64(DST, SRC); CONT; ALU_DIV_X: if (unlikely(SRC == 0)) return 0; tmp = (u32) DST; do_div(tmp, (u32) SRC); DST = (u32) tmp; CONT; ALU64_DIV_K: DST = div64_u64(DST, IMM); CONT; ALU_DIV_K: tmp = (u32) DST; do_div(tmp, (u32) IMM); DST = (u32) tmp; CONT; ALU_END_TO_BE: switch (IMM) { case 16: DST = (__force u16) cpu_to_be16(DST); break; case 32: DST = (__force u32) cpu_to_be32(DST); break; case 64: DST = (__force u64) cpu_to_be64(DST); break; } CONT; ALU_END_TO_LE: switch (IMM) { case 16: DST = (__force u16) cpu_to_le16(DST); break; case 32: DST = (__force u32) cpu_to_le32(DST); break; case 64: DST = (__force u64) cpu_to_le64(DST); break; } CONT; /* CALL */ JMP_CALL: /* Function call scratches BPF_R1-BPF_R5 registers, * preserves BPF_R6-BPF_R9, and stores return value * into BPF_R0. */ BPF_R0 = (__bpf_call_base + insn->imm)(BPF_R1, BPF_R2, BPF_R3, BPF_R4, BPF_R5); CONT; /* JMP */ JMP_JA: insn += insn->off; CONT; JMP_JEQ_X: if (DST == SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JEQ_K: if (DST == IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JNE_X: if (DST != SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JNE_K: if (DST != IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JGT_X: if (DST > SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JGT_K: if (DST > IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JGE_X: if (DST >= SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JGE_K: if (DST >= IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGT_X: if (((s64) DST) > ((s64) SRC)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGT_K: if (((s64) DST) > ((s64) IMM)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGE_X: if (((s64) DST) >= ((s64) SRC)) { insn += insn->off;Lines 1–500 of 674. 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/* * Linux Socket Filter - Kernel level socket filtering * * Based on the design of the Berkeley Packet Filter. The new * internal format has been designed by PLUMgrid: * * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com * * Authors: * * Jay Schulist <jschlst@samba.org> * Alexei Starovoitov <ast@plumgrid.com> * Daniel Borkmann <dborkman@redhat.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Andi Kleen - Fix a few bad bugs and races. * Kris Katterjohn - Added many additional checks in bpf_check_classic() */ #include <linux/filter.h> #include <linux/skbuff.h> #include <linux/vmalloc.h> #include <linux/random.h> #include <linux/moduleloader.h> #include <asm/unaligned.h> #include <linux/bpf.h> /* Registers */ #define BPF_R0 regs[BPF_REG_0] #define BPF_R1 regs[BPF_REG_1] #define BPF_R2 regs[BPF_REG_2] #define BPF_R3 regs[BPF_REG_3] #define BPF_R4 regs[BPF_REG_4] #define BPF_R5 regs[BPF_REG_5] #define BPF_R6 regs[BPF_REG_6] #define BPF_R7 regs[BPF_REG_7] #define BPF_R8 regs[BPF_REG_8] #define BPF_R9 regs[BPF_REG_9] #define BPF_R10 regs[BPF_REG_10] /* Named registers */ #define DST regs[insn->dst_reg] #define SRC regs[insn->src_reg] #define FP regs[BPF_REG_FP] #define ARG1 regs[BPF_REG_ARG1] #define CTX regs[BPF_REG_CTX] #define IMM insn->imm /* No hurry in this branch * * Exported for the bpf jit load helper. */ void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, int k, unsigned int size) { u8 *ptr = NULL; if (k >= SKF_NET_OFF) ptr = skb_network_header(skb) + k - SKF_NET_OFF; else if (k >= SKF_LL_OFF) ptr = skb_mac_header(skb) + k - SKF_LL_OFF; if (ptr >= skb->head && ptr + size <= skb_tail_pointer(skb)) return ptr; return NULL; } struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags) { gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO | gfp_extra_flags; struct bpf_prog_aux *aux; struct bpf_prog *fp; size = round_up(size, PAGE_SIZE); fp = __vmalloc(size, gfp_flags, PAGE_KERNEL); if (fp == NULL) return NULL; aux = kzalloc(sizeof(*aux), GFP_KERNEL | gfp_extra_flags); if (aux == NULL) { vfree(fp); return NULL; } fp->pages = size / PAGE_SIZE; fp->aux = aux; return fp; } EXPORT_SYMBOL_GPL(bpf_prog_alloc); struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, gfp_t gfp_extra_flags) { gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO | gfp_extra_flags; struct bpf_prog *fp; BUG_ON(fp_old == NULL); size = round_up(size, PAGE_SIZE); if (size <= fp_old->pages * PAGE_SIZE) return fp_old; fp = __vmalloc(size, gfp_flags, PAGE_KERNEL); if (fp != NULL) { memcpy(fp, fp_old, fp_old->pages * PAGE_SIZE); fp->pages = size / PAGE_SIZE; /* We keep fp->aux from fp_old around in the new * reallocated structure. */ fp_old->aux = NULL; __bpf_prog_free(fp_old); } return fp; } EXPORT_SYMBOL_GPL(bpf_prog_realloc); void __bpf_prog_free(struct bpf_prog *fp) { kfree(fp->aux); vfree(fp); } EXPORT_SYMBOL_GPL(__bpf_prog_free); #ifdef CONFIG_BPF_JIT struct bpf_binary_header * bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, unsigned int alignment, bpf_jit_fill_hole_t bpf_fill_ill_insns) { struct bpf_binary_header *hdr; unsigned int size, hole, start; /* Most of BPF filters are really small, but if some of them * fill a page, allow at least 128 extra bytes to insert a * random section of illegal instructions. */ size = round_up(proglen + sizeof(*hdr) + 128, PAGE_SIZE); hdr = module_alloc(size); if (hdr == NULL) return NULL; /* Fill space with illegal/arch-dep instructions. */ bpf_fill_ill_insns(hdr, size); hdr->pages = size / PAGE_SIZE; hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)), PAGE_SIZE - sizeof(*hdr)); start = (prandom_u32() % hole) & ~(alignment - 1); /* Leave a random number of instructions before BPF code. */ *image_ptr = &hdr->image[start]; return hdr; } void bpf_jit_binary_free(struct bpf_binary_header *hdr) { module_memfree(hdr); } #endif /* CONFIG_BPF_JIT */ /* Base function for offset calculation. Needs to go into .text section, * therefore keeping it non-static as well; will also be used by JITs * anyway later on, so do not let the compiler omit it. */ noinline u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) { return 0; } /** * __bpf_prog_run - run eBPF program on a given context * @ctx: is the data we are operating on * @insn: is the array of eBPF instructions * * Decode and execute eBPF instructions. */ static unsigned int __bpf_prog_run(void *ctx, const struct bpf_insn *insn) { u64 stack[MAX_BPF_STACK / sizeof(u64)]; u64 regs[MAX_BPF_REG], tmp; static const void *jumptable[256] = { [0 ... 255] = &&default_label, /* Now overwrite non-defaults ... */ /* 32 bit ALU operations */ [BPF_ALU | BPF_ADD | BPF_X] = &&ALU_ADD_X, [BPF_ALU | BPF_ADD | BPF_K] = &&ALU_ADD_K, [BPF_ALU | BPF_SUB | BPF_X] = &&ALU_SUB_X, [BPF_ALU | BPF_SUB | BPF_K] = &&ALU_SUB_K, [BPF_ALU | BPF_AND | BPF_X] = &&ALU_AND_X, [BPF_ALU | BPF_AND | BPF_K] = &&ALU_AND_K, [BPF_ALU | BPF_OR | BPF_X] = &&ALU_OR_X, [BPF_ALU | BPF_OR | BPF_K] = &&ALU_OR_K, [BPF_ALU | BPF_LSH | BPF_X] = &&ALU_LSH_X, [BPF_ALU | BPF_LSH | BPF_K] = &&ALU_LSH_K, [BPF_ALU | BPF_RSH | BPF_X] = &&ALU_RSH_X, [BPF_ALU | BPF_RSH | BPF_K] = &&ALU_RSH_K, [BPF_ALU | BPF_XOR | BPF_X] = &&ALU_XOR_X, [BPF_ALU | BPF_XOR | BPF_K] = &&ALU_XOR_K, [BPF_ALU | BPF_MUL | BPF_X] = &&ALU_MUL_X, [BPF_ALU | BPF_MUL | BPF_K] = &&ALU_MUL_K, [BPF_ALU | BPF_MOV | BPF_X] = &&ALU_MOV_X, [BPF_ALU | BPF_MOV | BPF_K] = &&ALU_MOV_K, [BPF_ALU | BPF_DIV | BPF_X] = &&ALU_DIV_X, [BPF_ALU | BPF_DIV | BPF_K] = &&ALU_DIV_K, [BPF_ALU | BPF_MOD | BPF_X] = &&ALU_MOD_X, [BPF_ALU | BPF_MOD | BPF_K] = &&ALU_MOD_K, [BPF_ALU | BPF_NEG] = &&ALU_NEG, [BPF_ALU | BPF_END | BPF_TO_BE] = &&ALU_END_TO_BE, [BPF_ALU | BPF_END | BPF_TO_LE] = &&ALU_END_TO_LE, /* 64 bit ALU operations */ [BPF_ALU64 | BPF_ADD | BPF_X] = &&ALU64_ADD_X, [BPF_ALU64 | BPF_ADD | BPF_K] = &&ALU64_ADD_K, [BPF_ALU64 | BPF_SUB | BPF_X] = &&ALU64_SUB_X, [BPF_ALU64 | BPF_SUB | BPF_K] = &&ALU64_SUB_K, [BPF_ALU64 | BPF_AND | BPF_X] = &&ALU64_AND_X, [BPF_ALU64 | BPF_AND | BPF_K] = &&ALU64_AND_K, [BPF_ALU64 | BPF_OR | BPF_X] = &&ALU64_OR_X, [BPF_ALU64 | BPF_OR | BPF_K] = &&ALU64_OR_K, [BPF_ALU64 | BPF_LSH | BPF_X] = &&ALU64_LSH_X, [BPF_ALU64 | BPF_LSH | BPF_K] = &&ALU64_LSH_K, [BPF_ALU64 | BPF_RSH | BPF_X] = &&ALU64_RSH_X, [BPF_ALU64 | BPF_RSH | BPF_K] = &&ALU64_RSH_K, [BPF_ALU64 | BPF_XOR | BPF_X] = &&ALU64_XOR_X, [BPF_ALU64 | BPF_XOR | BPF_K] = &&ALU64_XOR_K, [BPF_ALU64 | BPF_MUL | BPF_X] = &&ALU64_MUL_X, [BPF_ALU64 | BPF_MUL | BPF_K] = &&ALU64_MUL_K, [BPF_ALU64 | BPF_MOV | BPF_X] = &&ALU64_MOV_X, [BPF_ALU64 | BPF_MOV | BPF_K] = &&ALU64_MOV_K, [BPF_ALU64 | BPF_ARSH | BPF_X] = &&ALU64_ARSH_X, [BPF_ALU64 | BPF_ARSH | BPF_K] = &&ALU64_ARSH_K, [BPF_ALU64 | BPF_DIV | BPF_X] = &&ALU64_DIV_X, [BPF_ALU64 | BPF_DIV | BPF_K] = &&ALU64_DIV_K, [BPF_ALU64 | BPF_MOD | BPF_X] = &&ALU64_MOD_X, [BPF_ALU64 | BPF_MOD | BPF_K] = &&ALU64_MOD_K, [BPF_ALU64 | BPF_NEG] = &&ALU64_NEG, /* Call instruction */ [BPF_JMP | BPF_CALL] = &&JMP_CALL, /* Jumps */ [BPF_JMP | BPF_JA] = &&JMP_JA, [BPF_JMP | BPF_JEQ | BPF_X] = &&JMP_JEQ_X, [BPF_JMP | BPF_JEQ | BPF_K] = &&JMP_JEQ_K, [BPF_JMP | BPF_JNE | BPF_X] = &&JMP_JNE_X, [BPF_JMP | BPF_JNE | BPF_K] = &&JMP_JNE_K, [BPF_JMP | BPF_JGT | BPF_X] = &&JMP_JGT_X, [BPF_JMP | BPF_JGT | BPF_K] = &&JMP_JGT_K, [BPF_JMP | BPF_JGE | BPF_X] = &&JMP_JGE_X, [BPF_JMP | BPF_JGE | BPF_K] = &&JMP_JGE_K, [BPF_JMP | BPF_JSGT | BPF_X] = &&JMP_JSGT_X, [BPF_JMP | BPF_JSGT | BPF_K] = &&JMP_JSGT_K, [BPF_JMP | BPF_JSGE | BPF_X] = &&JMP_JSGE_X, [BPF_JMP | BPF_JSGE | BPF_K] = &&JMP_JSGE_K, [BPF_JMP | BPF_JSET | BPF_X] = &&JMP_JSET_X, [BPF_JMP | BPF_JSET | BPF_K] = &&JMP_JSET_K, /* Program return */ [BPF_JMP | BPF_EXIT] = &&JMP_EXIT, /* Store instructions */ [BPF_STX | BPF_MEM | BPF_B] = &&STX_MEM_B, [BPF_STX | BPF_MEM | BPF_H] = &&STX_MEM_H, [BPF_STX | BPF_MEM | BPF_W] = &&STX_MEM_W, [BPF_STX | BPF_MEM | BPF_DW] = &&STX_MEM_DW, [BPF_STX | BPF_XADD | BPF_W] = &&STX_XADD_W, [BPF_STX | BPF_XADD | BPF_DW] = &&STX_XADD_DW, [BPF_ST | BPF_MEM | BPF_B] = &&ST_MEM_B, [BPF_ST | BPF_MEM | BPF_H] = &&ST_MEM_H, [BPF_ST | BPF_MEM | BPF_W] = &&ST_MEM_W, [BPF_ST | BPF_MEM | BPF_DW] = &&ST_MEM_DW, /* Load instructions */ [BPF_LDX | BPF_MEM | BPF_B] = &&LDX_MEM_B, [BPF_LDX | BPF_MEM | BPF_H] = &&LDX_MEM_H, [BPF_LDX | BPF_MEM | BPF_W] = &&LDX_MEM_W, [BPF_LDX | BPF_MEM | BPF_DW] = &&LDX_MEM_DW, [BPF_LD | BPF_ABS | BPF_W] = &&LD_ABS_W, [BPF_LD | BPF_ABS | BPF_H] = &&LD_ABS_H, [BPF_LD | BPF_ABS | BPF_B] = &&LD_ABS_B, [BPF_LD | BPF_IND | BPF_W] = &&LD_IND_W, [BPF_LD | BPF_IND | BPF_H] = &&LD_IND_H, [BPF_LD | BPF_IND | BPF_B] = &&LD_IND_B, [BPF_LD | BPF_IMM | BPF_DW] = &&LD_IMM_DW, }; void *ptr; int off; #define CONT ({ insn++; goto select_insn; }) #define CONT_JMP ({ insn++; goto select_insn; }) FP = (u64) (unsigned long) &stack[ARRAY_SIZE(stack)]; ARG1 = (u64) (unsigned long) ctx; /* Registers used in classic BPF programs need to be reset first. */ regs[BPF_REG_A] = 0; regs[BPF_REG_X] = 0; select_insn: goto *jumptable[insn->code]; /* ALU */ #define ALU(OPCODE, OP) \ ALU64_##OPCODE##_X: \ DST = DST OP SRC; \ CONT; \ ALU_##OPCODE##_X: \ DST = (u32) DST OP (u32) SRC; \ CONT; \ ALU64_##OPCODE##_K: \ DST = DST OP IMM; \ CONT; \ ALU_##OPCODE##_K: \ DST = (u32) DST OP (u32) IMM; \ CONT; ALU(ADD, +) ALU(SUB, -) ALU(AND, &) ALU(OR, |) ALU(LSH, <<) ALU(RSH, >>) ALU(XOR, ^) ALU(MUL, *) #undef ALU ALU_NEG: DST = (u32) -DST; CONT; ALU64_NEG: DST = -DST; CONT; ALU_MOV_X: DST = (u32) SRC; CONT; ALU_MOV_K: DST = (u32) IMM; CONT; ALU64_MOV_X: DST = SRC; CONT; ALU64_MOV_K: DST = IMM; CONT; LD_IMM_DW: DST = (u64) (u32) insn[0].imm | ((u64) (u32) insn[1].imm) << 32; insn++; CONT; ALU64_ARSH_X: (*(s64 *) &DST) >>= SRC; CONT; ALU64_ARSH_K: (*(s64 *) &DST) >>= IMM; CONT; ALU64_MOD_X: if (unlikely(SRC == 0)) return 0; div64_u64_rem(DST, SRC, &tmp); DST = tmp; CONT; ALU_MOD_X: if (unlikely(SRC == 0)) return 0; tmp = (u32) DST; DST = do_div(tmp, (u32) SRC); CONT; ALU64_MOD_K: div64_u64_rem(DST, IMM, &tmp); DST = tmp; CONT; ALU_MOD_K: tmp = (u32) DST; DST = do_div(tmp, (u32) IMM); CONT; ALU64_DIV_X: if (unlikely(SRC == 0)) return 0; DST = div64_u64(DST, SRC); CONT; ALU_DIV_X: if (unlikely(SRC == 0)) return 0; tmp = (u32) DST; do_div(tmp, (u32) SRC); DST = (u32) tmp; CONT; ALU64_DIV_K: DST = div64_u64(DST, IMM); CONT; ALU_DIV_K: tmp = (u32) DST; do_div(tmp, (u32) IMM); DST = (u32) tmp; CONT; ALU_END_TO_BE: switch (IMM) { case 16: DST = (__force u16) cpu_to_be16(DST); break; case 32: DST = (__force u32) cpu_to_be32(DST); break; case 64: DST = (__force u64) cpu_to_be64(DST); break; } CONT; ALU_END_TO_LE: switch (IMM) { case 16: DST = (__force u16) cpu_to_le16(DST); break; case 32: DST = (__force u32) cpu_to_le32(DST); break; case 64: DST = (__force u64) cpu_to_le64(DST); break; } CONT; /* CALL */ JMP_CALL: /* Function call scratches BPF_R1-BPF_R5 registers, * preserves BPF_R6-BPF_R9, and stores return value * into BPF_R0. */ BPF_R0 = (__bpf_call_base + insn->imm)(BPF_R1, BPF_R2, BPF_R3, BPF_R4, BPF_R5); CONT; /* JMP */ JMP_JA: insn += insn->off; CONT; JMP_JEQ_X: if (DST == SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JEQ_K: if (DST == IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JNE_X: if (DST != SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JNE_K: if (DST != IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JGT_X: if (DST > SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JGT_K: if (DST > IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JGE_X: if (DST >= SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JGE_K: if (DST >= IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGT_X: if (((s64) DST) > ((s64) SRC)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGT_K: if (((s64) DST) > ((s64) IMM)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGE_X: if (((s64) DST) >= ((s64) SRC)) { insn += insn->off;