/* * 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 * Alexei Starovoitov * Daniel Borkmann * * 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 #include #include #include #include #include #include #include #include #include #include /* 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_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; fp->aux->prog = fp; fp->jit_requested = ebpf_jit_enabled(); INIT_LIST_HEAD_RCU(&fp->aux->ksym_lnode); 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_ZERO | gfp_extra_flags; struct bpf_prog *fp; u32 pages, delta; int ret; BUG_ON(fp_old == NULL); size = round_up(size, PAGE_SIZE); pages = size / PAGE_SIZE; if (pages <= fp_old->pages) return fp_old; delta = pages - fp_old->pages; ret = __bpf_prog_charge(fp_old->aux->user, delta); if (ret) return NULL; fp = __vmalloc(size, gfp_flags, PAGE_KERNEL); if (fp == NULL) { __bpf_prog_uncharge(fp_old->aux->user, delta); } else { memcpy(fp, fp_old, fp_old->pages * PAGE_SIZE); fp->pages = pages; fp->aux->prog = fp; /* We keep fp->aux from fp_old around in the new * reallocated structure. */ fp_old->aux = NULL; __bpf_prog_free(fp_old); } return fp; } void __bpf_prog_free(struct bpf_prog *fp) { kfree(fp->aux); vfree(fp); } int bpf_prog_calc_tag(struct bpf_prog *fp) { const u32 bits_offset = SHA_MESSAGE_BYTES - sizeof(__be64); u32 raw_size = bpf_prog_tag_scratch_size(fp); u32 digest[SHA_DIGEST_WORDS]; u32 ws[SHA_WORKSPACE_WORDS]; u32 i, bsize, psize, blocks; struct bpf_insn *dst; bool was_ld_map; u8 *raw, *todo; __be32 *result; __be64 *bits; raw = vmalloc(raw_size); if (!raw) return -ENOMEM; sha_init(digest); memset(ws, 0, sizeof(ws)); /* We need to take out the map fd for the digest calculation * since they are unstable from user space side. */ dst = (void *)raw; for (i = 0, was_ld_map = false; i < fp->len; i++) { dst[i] = fp->insnsi[i]; if (!was_ld_map && dst[i].code == (BPF_LD | BPF_IMM | BPF_DW) && dst[i].src_reg == BPF_PSEUDO_MAP_FD) { was_ld_map = true; dst[i].imm = 0; } else if (was_ld_map && dst[i].code == 0 && dst[i].dst_reg == 0 && dst[i].src_reg == 0 && dst[i].off == 0) { was_ld_map = false; dst[i].imm = 0; } else { was_ld_map = false; } } psize = bpf_prog_insn_size(fp); memset(&raw[psize], 0, raw_size - psize); raw[psize++] = 0x80; bsize = round_up(psize, SHA_MESSAGE_BYTES); blocks = bsize / SHA_MESSAGE_BYTES; todo = raw; if (bsize - psize >= sizeof(__be64)) { bits = (__be64 *)(todo + bsize - sizeof(__be64)); } else { bits = (__be64 *)(todo + bsize + bits_offset); blocks++; } *bits = cpu_to_be64((psize - 1) << 3); while (blocks--) { sha_transform(digest, todo, ws); todo += SHA_MESSAGE_BYTES; } result = (__force __be32 *)digest; for (i = 0; i < SHA_DIGEST_WORDS; i++) result[i] = cpu_to_be32(digest[i]); memcpy(fp->tag, result, sizeof(fp->tag)); vfree(raw); return 0; } static void bpf_adj_branches(struct bpf_prog *prog, u32 pos, u32 delta) { struct bpf_insn *insn = prog->insnsi; u32 i, insn_cnt = prog->len; bool pseudo_call; u8 code; int off; for (i = 0; i < insn_cnt; i++, insn++) { code = insn->code; if (BPF_CLASS(code) != BPF_JMP) continue; if (BPF_OP(code) == BPF_EXIT) continue; if (BPF_OP(code) == BPF_CALL) { if (insn->src_reg == BPF_PSEUDO_CALL) pseudo_call = true; else continue; } else { pseudo_call = false; } off = pseudo_call ? insn->imm : insn->off; /* Adjust offset of jmps if we cross boundaries. */ if (i < pos && i + off + 1 > pos) off += delta; else if (i > pos + delta && i + off + 1 <= pos + delta) off -= delta; if (pseudo_call) insn->imm = off; else insn->off = off; } } struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off, const struct bpf_insn *patch, u32 len) { u32 insn_adj_cnt, insn_rest, insn_delta = len - 1; struct bpf_prog *prog_adj; /* Since our patchlet doesn't expand the image, we're done. */ if (insn_delta == 0) { memcpy(prog->insnsi + off, patch, sizeof(*patch)); return prog; } insn_adj_cnt = prog->len + insn_delta; /* Several new instructions need to be inserted. Make room * for them. Likely, there's no need for a new allocation as * last page could have large enough tailroom. */ prog_adj = bpf_prog_realloc(prog, bpf_prog_size(insn_adj_cnt), GFP_USER); if (!prog_adj) return NULL; prog_adj->len = insn_adj_cnt; /* Patching happens in 3 steps: * * 1) Move over tail of insnsi from next instruction onwards, * so we can patch the single target insn with one or more * new ones (patching is always from 1 to n insns, n > 0). * 2) Inject new instructions at the target location. * 3) Adjust branch offsets if necessary. */ insn_rest = insn_adj_cnt - off - len; memmove(prog_adj->insnsi + off + len, prog_adj->insnsi + off + 1, sizeof(*patch) * insn_rest); memcpy(prog_adj->insnsi + off, patch, sizeof(*patch) * len); bpf_adj_branches(prog_adj, off, insn_delta); return prog_adj; } #ifdef CONFIG_BPF_JIT static __always_inline void bpf_get_prog_addr_region(const struct bpf_prog *prog, unsigned long *symbol_start, unsigned long *symbol_end) { const struct bpf_binary_header *hdr = bpf_jit_binary_hdr(prog); unsigned long addr = (unsigned long)hdr; WARN_ON_ONCE(!bpf_prog_ebpf_jited(prog)); *symbol_start = addr; *symbol_end = addr + hdr->pages * PAGE_SIZE; } static void bpf_get_prog_name(const struct bpf_prog *prog, char *sym) { const char *end = sym + KSYM_NAME_LEN; BUILD_BUG_ON(sizeof("bpf_prog_") + sizeof(prog->tag) * 2 + /* name has been null terminated. * We should need +1 for the '_' preceding * the name. However, the null character * is double counted between the name and the * sizeof("bpf_prog_") above, so we omit * the +1 here. */ sizeof(prog->aux->name) > KSYM_NAME_LEN); sym += snprintf(sym, KSYM_NAME_LEN, "bpf_prog_"); sym = bin2hex(sym, prog->tag, sizeof(prog->tag)); if (prog->aux->name[0]) snprintf(sym, (size_t)(end - sym), "_%s", prog->aux->name); else *sym = 0; } static __always_inline unsigned long bpf_get_prog_addr_start(struct latch_tree_node *n) { unsigned long symbol_start, symbol_end; const struct bpf_prog_aux *aux; aux = container_of(n, struct bpf_prog_aux, ksym_tnode); bpf_get_prog_addr_region(aux->prog, &symbol_start, &symbol_end); return symbol_start; } static __always_inline bool bpf_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) { return bpf_get_prog_addr_start(a) < bpf_get_prog_addr_start(b); } static __always_inline int bpf_tree_comp(void *key, struct latch_tree_node *n) { unsigned long val = (unsigned long)key; unsigned long symbol_start, symbol_end; const struct bpf_prog_aux *aux; aux = container_of(n, struct bpf_prog_aux, ksym_tnode); bpf_get_prog_addr_region(aux->prog, &symbol_start, &symbol_end); if (val < symbol_start) return -1; if (val >= symbol_end) return 1; return 0; } static const struct latch_tree_ops bpf_tree_ops = { .less = bpf_tree_less, .comp = bpf_tree_comp, }; static DEFINE_SPINLOCK(bpf_lock); static LIST_HEAD(bpf_kallsyms); static struct latch_tree_root bpf_tree __cacheline_aligned; int bpf_jit_kallsyms __read_mostly; static void bpf_prog_ksym_node_add(struct bpf_prog_aux *aux) { WARN_ON_ONCE(!list_empty(&aux->ksym_lnode)); list_add_tail_rcu(&aux->ksym_lnode, &bpf_kallsyms); latch_tree_insert(&aux->ksym_tnode, &bpf_tree, &bpf_tree_ops); } static void bpf_prog_ksym_node_del(struct bpf_prog_aux *aux) { if (list_empty(&aux->ksym_lnode)) return; latch_tree_erase(&aux->ksym_tnode, &bpf_tree, &bpf_tree_ops); list_del_rcu(&aux->ksym_lnode); } static bool bpf_prog_kallsyms_candidate(const struct bpf_prog *fp) { return fp->jited && !bpf_prog_was_classic(fp); } static bool bpf_prog_kallsyms_verify_off(const struct bpf_prog *fp) { return list_empty(&fp->aux->ksym_lnode) || fp->aux->ksym_lnode.prev == LIST_POISON2; } void bpf_prog_kallsyms_add(struct bpf_prog *fp) { if (!bpf_prog_kallsyms_candidate(fp) || !capable(CAP_SYS_ADMIN)) return; spin_lock_bh(&bpf_lock); bpf_prog_ksym_node_add(fp->aux); spin_unlock_bh(&bpf_lock); } void bpf_prog_kallsyms_del(struct bpf_prog *fp) { if (!bpf_prog_kallsyms_candidate(fp)) return; spin_lock_bh(&bpf_lock); bpf_prog_ksym_node_del(fp->aux); spin_unlock_bh(&bpf_lock); } static struct bpf_prog *bpf_prog_kallsyms_find(unsigned long addr) { struct latch_tree_node *n; if (!bpf_jit_kallsyms_enabled()) return NULL; n = latch_tree_find((void *)addr, &bpf_tree, &bpf_tree_ops); return n ? container_of(n, struct bpf_prog_aux, ksym_tnode)->prog : NULL; } const char *__bpf_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char *sym) { unsigned long symbol_start, symbol_end; struct bpf_prog *prog; char *ret = NULL; rcu_read_lock(); prog = bpf_prog_kallsyms_find(addr); if (prog) { bpf_get_prog_addr_region(prog, &symbol_start, &symbol_end); bpf_get_prog_name(prog, sym); ret = sym; if (size) *size = symbol_end - symbol_start; if (off) *off = addr - symbol_start; } rcu_read_unlock(); return ret; } bool is_bpf_text_address(unsigned long addr) { bool ret; rcu_read_lock(); ret = bpf_prog_kallsyms_find(addr) != NULL; rcu_read_unlock(); return ret; } int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *sym) { unsigned long symbol_start, symbol_end; struct bpf_prog_aux *aux; unsigned int it = 0; int ret = -ERANGE; if (!bpf_jit_kallsyms_enabled()) return ret; rcu_read_lock(); list_for_each_entry_rcu(aux, &bpf_kallsyms, ksym_lnode) { if (it++ != symnum) continue; bpf_get_prog_addr_region(aux->prog, &symbol_start, &symbol_end); bpf_get_prog_name(aux->prog, sym); *value = symbol_start; *type = BPF_SYM_ELF_TYPE; ret = 0; break; } rcu_read_unlock(); return ret; } 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 = (get_random_int() % 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); } /* This symbol is only overridden by archs that have different * requirements than the usual eBPF JITs, f.e. when they only * implement cBPF JIT, do not set images read-only, etc. */ void __weak bpf_jit_free(struct bpf_prog *fp) { if (fp->jited) { struct bpf_binary_header *hdr = bpf_jit_binary_hdr(fp); bpf_jit_binary_unlock_ro(hdr); bpf_jit_binary_free(hdr); WARN_ON_ONCE(!bpf_prog_kallsyms_verify_off(fp)); } bpf_prog_unlock_free(fp); } int bpf_jit_harden __read_mostly; static int bpf_jit_blind_insn(const struct bpf_insn *from, const struct bpf_insn *aux, struct bpf_insn *to_buff) { struct bpf_insn *to = to_buff; u32 imm_rnd = get_random_int(); s16 off; BUILD_BUG_ON(BPF_REG_AX + 1 != MAX_BPF_JIT_REG); BUILD_BUG_ON(MAX_BPF_REG + 1 != MAX_BPF_JIT_REG); if (from->imm == 0 && (from->code == (BPF_ALU | BPF_MOV | BPF_K) || from->code == (BPF_ALU64 | BPF_MOV | BPF_K))) { *to++ = BPF_ALU64_REG(BPF_XOR, from->dst_reg, from->dst_reg); goto out; } switch (from->code) { case BPF_ALU | BPF_ADD | BPF_K: case BPF_ALU | BPF_SUB | BPF_K: case BPF_ALU | BPF_AND | BPF_K: case BPF_ALU | BPF_OR | BPF_K: case BPF_ALU | BPF_XOR | BPF_K: case BPF_ALU | BPF_MUL | BPF_K: case BPF_ALU | BPF_MOV | BPF_K: case BPF_ALU | BPF_DIV | BPF_K: case BPF_ALU | BPF_MOD | BPF_K: *to++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm); *to++ = BPF_ALU32_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_ALU32_REG(from->code, from->dst_reg, BPF_REG_AX); break; case BPF_ALU64 | BPF_ADD | BPF_K: case BPF_ALU64 | BPF_SUB | BPF_K: case BPF_ALU64 | BPF_AND | BPF_K: case BPF_ALU64 | BPF_OR | BPF_K: case BPF_ALU64 | BPF_XOR | BPF_K: case BPF_ALU64 | BPF_MUL | BPF_K: case BPF_ALU64 | BPF_MOV | BPF_K: case BPF_ALU64 | BPF_DIV | BPF_K: case BPF_ALU64 | BPF_MOD | BPF_K: *to++ = BPF_ALU64_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm); *to++ = BPF_ALU64_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_ALU64_REG(from->code, from->dst_reg, BPF_REG_AX); break; case BPF_JMP | BPF_JEQ | BPF_K: case BPF_JMP | BPF_JNE | BPF_K: case BPF_JMP | BPF_JGT | BPF_K: case BPF_JMP | BPF_JLT | BPF_K: case BPF_JMP | BPF_JGE | BPF_K: case BPF_JMP | BPF_JLE | BPF_K: case BPF_JMP | BPF_JSGT | BPF_K: case BPF_JMP | BPF_JSLT | BPF_K: case BPF_JMP | BPF_JSGE | BPF_K: case BPF_JMP | BPF_JSLE | BPF_K: case BPF_JMP | BPF_JSET | BPF_K: /* Accommodate for extra offset in case of a backjump. */ off = from->off; if (off < 0) off -= 2; *to++ = BPF_ALU64_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm); *to++ = BPF_ALU64_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_JMP_REG(from->code, from->dst_reg, BPF_REG_AX, off); break; case BPF_LD | BPF_ABS | BPF_W: case BPF_LD | BPF_ABS | BPF_H: case BPF_LD | BPF_ABS | BPF_B: *to++ = BPF_ALU64_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm); *to++ = BPF_ALU64_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_LD_IND(from->code, BPF_REG_AX, 0); break; case BPF_LD | BPF_IND | BPF_W: case BPF_LD | BPF_IND | BPF_H: case BPF_LD | BPF_IND | BPF_B: *to++ = BPF_ALU64_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm); *to++ = BPF_ALU64_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_ALU32_REG(BPF_ADD, BPF_REG_AX, from->src_reg); *to++ = BPF_LD_IND(from->code, BPF_REG_AX, 0); break; case BPF_LD | BPF_IMM | BPF_DW: *to++ = BPF_ALU64_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ aux[1].imm); *to++ = BPF_ALU64_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_ALU64_IMM(BPF_LSH, BPF_REG_AX, 32); *to++ = BPF_ALU64_REG(BPF_MOV, aux[0].dst_reg, BPF_REG_AX); break; case 0: /* Part 2 of BPF_LD | BPF_IMM | BPF_DW. */ *to++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ aux[0].imm); *to++ = BPF_ALU32_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_ALU64_REG(BPF_OR, aux[0].dst_reg, BPF_REG_AX); break; case BPF_ST | BPF_MEM | BPF_DW: case BPF_ST | BPF_MEM | BPF_W: case BPF_ST | BPF_MEM | BPF_H: case BPF_ST | BPF_MEM | BPF_B: *to++ = BPF_ALU64_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm); *to++ = BPF_ALU64_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); *to++ = BPF_STX_MEM(from->code, from->dst_reg, BPF_REG_AX, from->off); break; } out: return to - to_buff; } static struct bpf_prog *bpf_prog_clone_create(struct bpf_prog *fp_other, gfp_t gfp_extra_flags) { gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags; struct bpf_prog *fp; fp = __vmalloc(fp_other->pages * PAGE_SIZE, gfp_flags, PAGE_KERNEL); if (fp != NULL) { /* aux->prog still points to the fp_other one, so * when promoting the clone to the real program, * this still needs to be adapted. */ memcpy(fp, fp_other, fp_other->pages * PAGE_SIZE); } return fp; } static void bpf_prog_clone_free(struct bpf_prog *fp) { /* aux was stolen by the other clone, so we cannot free * it from this path! It will be freed eventually by the * other program on release. * * At this point, we don't need a deferred release since * clone is guaranteed to not be locked. */ fp->aux = NULL; __bpf_prog_free(fp); } void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other) { /* We have to repoint aux->prog to self, as we don't * know whether fp here is the clone or the original. */ fp->aux->prog = fp; bpf_prog_clone_free(fp_other); } struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *prog) { struct bpf_insn insn_buff[16], aux[2]; struct bpf_prog *clone, *tmp; int insn_delta, insn_cnt; struct bpf_insn *insn; int i, rewritten; if (!bpf_jit_blinding_enabled(prog)) return prog; clone = bpf_prog_clone_create(prog, GFP_USER); if (!clone) return ERR_PTR(-ENOMEM); insn_cnt = clone->len; insn = clone->insnsi; for (i = 0; i < insn_cnt; i++, insn++) { /* We temporarily need to hold the original ld64 insn * so that we can still access the first part in the * second blinding run. */ if (insn[0].code == (BPF_LD | BPF_IMM | BPF_DW) && insn[1].code == 0) memcpy(aux, insn, sizeof(aux)); rewritten = bpf_jit_blind_insn(insn, aux, insn_buff); if (!rewritten) continue; tmp = bpf_patch_insn_single(clone, i, insn_buff, rewritten); if (!tmp) { /* Patching may have repointed aux->prog during * realloc from the original one, so we need to * fix it up here on error. */ bpf_jit_prog_release_other(prog, clone); return ERR_PTR(-ENOMEM); } clone = tmp; insn_delta = rewritten - 1; /* Walk new program and skip insns we just inserted. */ insn = clone->insnsi + i + insn_delta; insn_cnt += insn_delta; i += insn_delta; } return clone; } #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; } EXPORT_SYMBOL_GPL(__bpf_call_base); /** * __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 u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack) { u64 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, [BPF_JMP | BPF_CALL_ARGS] = &&JMP_CALL_ARGS, [BPF_JMP | BPF_TAIL_CALL] = &&JMP_TAIL_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_JLT | BPF_X] = &&JMP_JLT_X, [BPF_JMP | BPF_JLT | BPF_K] = &&JMP_JLT_K, [BPF_JMP | BPF_JGE | BPF_X] = &&JMP_JGE_X, [BPF_JMP | BPF_JGE | BPF_K] = &&JMP_JGE_K, [BPF_JMP | BPF_JLE | BPF_X] = &&JMP_JLE_X, [BPF_JMP | BPF_JLE | BPF_K] = &&JMP_JLE_K, [BPF_JMP | BPF_JSGT | BPF_X] = &&JMP_JSGT_X, [BPF_JMP | BPF_JSGT | BPF_K] = &&JMP_JSGT_K, [BPF_JMP | BPF_JSLT | BPF_X] = &&JMP_JSLT_X, [BPF_JMP | BPF_JSLT | BPF_K] = &&JMP_JSLT_K, [BPF_JMP | BPF_JSGE | BPF_X] = &&JMP_JSGE_X, [BPF_JMP | BPF_JSGE | BPF_K] = &&JMP_JSGE_K, [BPF_JMP | BPF_JSLE | BPF_X] = &&JMP_JSLE_X, [BPF_JMP | BPF_JSLE | BPF_K] = &&JMP_JSLE_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, }; u32 tail_call_cnt = 0; void *ptr; int off; #define CONT ({ insn++; goto select_insn; }) #define CONT_JMP ({ insn++; goto select_insn; }) 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_CALL_ARGS: BPF_R0 = (__bpf_call_base_args + insn->imm)(BPF_R1, BPF_R2, BPF_R3, BPF_R4, BPF_R5, insn + insn->off + 1); CONT; JMP_TAIL_CALL: { struct bpf_map *map = (struct bpf_map *) (unsigned long) BPF_R2; struct bpf_array *array = container_of(map, struct bpf_array, map); struct bpf_prog *prog; u32 index = BPF_R3; if (unlikely(index >= array->map.max_entries)) goto out; if (unlikely(tail_call_cnt > MAX_TAIL_CALL_CNT)) goto out; tail_call_cnt++; prog = READ_ONCE(array->ptrs[index]); if (!prog) goto out; /* ARG1 at this point is guaranteed to point to CTX from * the verifier side due to the fact that the tail call is * handeled like a helper, that is, bpf_tail_call_proto, * where arg1_type is ARG_PTR_TO_CTX. */ insn = prog->insnsi; goto select_insn; out: 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_JLT_X: if (DST < SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JLT_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_JLE_X: if (DST <= SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JLE_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_JSLT_X: if (((s64) DST) < ((s64) SRC)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSLT_K: if (((s64) DST) < ((s64) IMM)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGE_X: if (((s64) DST) >= ((s64) SRC)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSGE_K: if (((s64) DST) >= ((s64) IMM)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSLE_X: if (((s64) DST) <= ((s64) SRC)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSLE_K: if (((s64) DST) <= ((s64) IMM)) { insn += insn->off; CONT_JMP; } CONT; JMP_JSET_X: if (DST & SRC) { insn += insn->off; CONT_JMP; } CONT; JMP_JSET_K: if (DST & IMM) { insn += insn->off; CONT_JMP; } CONT; JMP_EXIT: return BPF_R0; /* STX and ST and LDX*/ #define LDST(SIZEOP, SIZE) \ STX_MEM_##SIZEOP: \ *(SIZE *)(unsigned long) (DST + insn->off) = SRC; \ CONT; \ ST_MEM_##SIZEOP: \ *(SIZE *)(unsigned long) (DST + insn->off) = IMM; \ CONT; \ LDX_MEM_##SIZEOP: \ DST = *(SIZE *)(unsigned long) (SRC + insn->off); \ CONT; LDST(B, u8) LDST(H, u16) LDST(W, u32) LDST(DW, u64) #undef LDST STX_XADD_W: /* lock xadd *(u32 *)(dst_reg + off16) += src_reg */ atomic_add((u32) SRC, (atomic_t *)(unsigned long) (DST + insn->off)); CONT; STX_XADD_DW: /* lock xadd *(u64 *)(dst_reg + off16) += src_reg */ atomic64_add((u64) SRC, (atomic64_t *)(unsigned long) (DST + insn->off)); CONT; LD_ABS_W: /* BPF_R0 = ntohl(*(u32 *) (skb->data + imm32)) */ off = IMM; load_word: /* BPF_LD + BPD_ABS and BPF_LD + BPF_IND insns are only * appearing in the programs where ctx == skb * (see may_access_skb() in the verifier). All programs * keep 'ctx' in regs[BPF_REG_CTX] == BPF_R6, * bpf_convert_filter() saves it in BPF_R6, internal BPF * verifier will check that BPF_R6 == ctx. * * BPF_ABS and BPF_IND are wrappers of function calls, * so they scratch BPF_R1-BPF_R5 registers, preserve * BPF_R6-BPF_R9, and store return value into BPF_R0. * * Implicit input: * ctx == skb == BPF_R6 == CTX * * Explicit input: * SRC == any register * IMM == 32-bit immediate * * Output: * BPF_R0 - 8/16/32-bit skb data converted to cpu endianness */ ptr = bpf_load_pointer((struct sk_buff *) (unsigned long) CTX, off, 4, &tmp); if (likely(ptr != NULL)) { BPF_R0 = get_unaligned_be32(ptr); CONT; } return 0; LD_ABS_H: /* BPF_R0 = ntohs(*(u16 *) (skb->data + imm32)) */ off = IMM; load_half: ptr = bpf_load_pointer((struct sk_buff *) (unsigned long) CTX, off, 2, &tmp); if (likely(ptr != NULL)) { BPF_R0 = get_unaligned_be16(ptr); CONT; } return 0; LD_ABS_B: /* BPF_R0 = *(u8 *) (skb->data + imm32) */ off = IMM; load_byte: ptr = bpf_load_pointer((struct sk_buff *) (unsigned long) CTX, off, 1, &tmp); if (likely(ptr != NULL)) { BPF_R0 = *(u8 *)ptr; CONT; } return 0; LD_IND_W: /* BPF_R0 = ntohl(*(u32 *) (skb->data + src_reg + imm32)) */ off = IMM + SRC; goto load_word; LD_IND_H: /* BPF_R0 = ntohs(*(u16 *) (skb->data + src_reg + imm32)) */ off = IMM + SRC; goto load_half; LD_IND_B: /* BPF_R0 = *(u8 *) (skb->data + src_reg + imm32) */ off = IMM + SRC; goto load_byte; default_label: /* If we ever reach this, we have a bug somewhere. */ WARN_RATELIMIT(1, "unknown opcode %02x\n", insn->code); return 0; } STACK_FRAME_NON_STANDARD(___bpf_prog_run); /* jump table */ #define PROG_NAME(stack_size) __bpf_prog_run##stack_size #define DEFINE_BPF_PROG_RUN(stack_size) \ static unsigned int PROG_NAME(stack_size)(const void *ctx, const struct bpf_insn *insn) \ { \ u64 stack[stack_size / sizeof(u64)]; \ u64 regs[MAX_BPF_REG]; \ \ FP = (u64) (unsigned long) &stack[ARRAY_SIZE(stack)]; \ ARG1 = (u64) (unsigned long) ctx; \ return ___bpf_prog_run(regs, insn, stack); \ } #define PROG_NAME_ARGS(stack_size) __bpf_prog_run_args##stack_size #define DEFINE_BPF_PROG_RUN_ARGS(stack_size) \ static u64 PROG_NAME_ARGS(stack_size)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5, \ const struct bpf_insn *insn) \ { \ u64 stack[stack_size / sizeof(u64)]; \ u64 regs[MAX_BPF_REG]; \ \ FP = (u64) (unsigned long) &stack[ARRAY_SIZE(stack)]; \ BPF_R1 = r1; \ BPF_R2 = r2; \ BPF_R3 = r3; \ BPF_R4 = r4; \ BPF_R5 = r5; \ return ___bpf_prog_run(regs, insn, stack); \ } #define EVAL1(FN, X) FN(X) #define EVAL2(FN, X, Y...) FN(X) EVAL1(FN, Y) #define EVAL3(FN, X, Y...) FN(X) EVAL2(FN, Y) #define EVAL4(FN, X, Y...) FN(X) EVAL3(FN, Y) #define EVAL5(FN, X, Y...) FN(X) EVAL4(FN, Y) #define EVAL6(FN, X, Y...) FN(X) EVAL5(FN, Y) EVAL6(DEFINE_BPF_PROG_RUN, 32, 64, 96, 128, 160, 192); EVAL6(DEFINE_BPF_PROG_RUN, 224, 256, 288, 320, 352, 384); EVAL4(DEFINE_BPF_PROG_RUN, 416, 448, 480, 512); EVAL6(DEFINE_BPF_PROG_RUN_ARGS, 32, 64, 96, 128, 160, 192); EVAL6(DEFINE_BPF_PROG_RUN_ARGS, 224, 256, 288, 320, 352, 384); EVAL4(DEFINE_BPF_PROG_RUN_ARGS, 416, 448, 480, 512); #define PROG_NAME_LIST(stack_size) PROG_NAME(stack_size), static unsigned int (*interpreters[])(const void *ctx, const struct bpf_insn *insn) = { EVAL6(PROG_NAME_LIST, 32, 64, 96, 128, 160, 192) EVAL6(PROG_NAME_LIST, 224, 256, 288, 320, 352, 384) EVAL4(PROG_NAME_LIST, 416, 448, 480, 512) }; #undef PROG_NAME_LIST #define PROG_NAME_LIST(stack_size) PROG_NAME_ARGS(stack_size), static u64 (*interpreters_args[])(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5, const struct bpf_insn *insn) = { EVAL6(PROG_NAME_LIST, 32, 64, 96, 128, 160, 192) EVAL6(PROG_NAME_LIST, 224, 256, 288, 320, 352, 384) EVAL4(PROG_NAME_LIST, 416, 448, 480, 512) }; #undef PROG_NAME_LIST void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth) { stack_depth = max_t(u32, stack_depth, 1); insn->off = (s16) insn->imm; insn->imm = interpreters_args[(round_up(stack_depth, 32) / 32) - 1] - __bpf_call_base_args; insn->code = BPF_JMP | BPF_CALL_ARGS; } bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp) { if (fp->kprobe_override) return false; if (!array->owner_prog_type) { /* There's no owner yet where we could check for * compatibility. */ array->owner_prog_type = fp->type; array->owner_jited = fp->jited; return true; } return array->owner_prog_type == fp->type && array->owner_jited == fp->jited; } static int bpf_check_tail_call(const struct bpf_prog *fp) { struct bpf_prog_aux *aux = fp->aux; int i; for (i = 0; i < aux->used_map_cnt; i++) { struct bpf_map *map = aux->used_maps[i]; struct bpf_array *array; if (map->map_type != BPF_MAP_TYPE_PROG_ARRAY) continue; array = container_of(map, struct bpf_array, map); if (!bpf_prog_array_compatible(array, fp)) return -EINVAL; } return 0; } /** * bpf_prog_select_runtime - select exec runtime for BPF program * @fp: bpf_prog populated with internal BPF program * @err: pointer to error variable * * Try to JIT eBPF program, if JIT is not available, use interpreter. * The BPF program will be executed via BPF_PROG_RUN() macro. */ struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err) { u32 stack_depth = max_t(u32, fp->aux->stack_depth, 1); fp->bpf_func = interpreters[(round_up(stack_depth, 32) / 32) - 1]; /* eBPF JITs can rewrite the program in case constant * blinding is active. However, in case of error during * blinding, bpf_int_jit_compile() must always return a * valid program, which in this case would simply not * be JITed, but falls back to the interpreter. */ if (!bpf_prog_is_dev_bound(fp->aux)) { fp = bpf_int_jit_compile(fp); } else { *err = bpf_prog_offload_compile(fp); if (*err) return fp; } bpf_prog_lock_ro(fp); /* The tail call compatibility check can only be done at * this late stage as we need to determine, if we deal * with JITed or non JITed program concatenations and not * all eBPF JITs might immediately support all features. */ *err = bpf_check_tail_call(fp); return fp; } EXPORT_SYMBOL_GPL(bpf_prog_select_runtime); static unsigned int __bpf_prog_ret1(const void *ctx, const struct bpf_insn *insn) { return 1; } static struct bpf_prog_dummy { struct bpf_prog prog; } dummy_bpf_prog = { .prog = { .bpf_func = __bpf_prog_ret1, }, }; /* to avoid allocating empty bpf_prog_array for cgroups that * don't have bpf program attached use one global 'empty_prog_array' * It will not be modified the caller of bpf_prog_array_alloc() * (since caller requested prog_cnt == 0) * that pointer should be 'freed' by bpf_prog_array_free() */ static struct { struct bpf_prog_array hdr; struct bpf_prog *null_prog; } empty_prog_array = { .null_prog = NULL, }; struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags) { if (prog_cnt) return kzalloc(sizeof(struct bpf_prog_array) + sizeof(struct bpf_prog *) * (prog_cnt + 1), flags); return &empty_prog_array.hdr; } void bpf_prog_array_free(struct bpf_prog_array __rcu *progs) { if (!progs || progs == (struct bpf_prog_array __rcu *)&empty_prog_array.hdr) return; kfree_rcu(progs, rcu); } int bpf_prog_array_length(struct bpf_prog_array __rcu *progs) { struct bpf_prog **prog; u32 cnt = 0; rcu_read_lock(); prog = rcu_dereference(progs)->progs; for (; *prog; prog++) if (*prog != &dummy_bpf_prog.prog) cnt++; rcu_read_unlock(); return cnt; } int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, __u32 __user *prog_ids, u32 cnt) { struct bpf_prog **prog; u32 i = 0, id; rcu_read_lock(); prog = rcu_dereference(progs)->progs; for (; *prog; prog++) { if (*prog == &dummy_bpf_prog.prog) continue; id = (*prog)->aux->id; if (copy_to_user(prog_ids + i, &id, sizeof(id))) { rcu_read_unlock(); return -EFAULT; } if (++i == cnt) { prog++; break; } } rcu_read_unlock(); if (*prog) return -ENOSPC; return 0; } void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, struct bpf_prog *old_prog) { struct bpf_prog **prog = progs->progs; for (; *prog; prog++) if (*prog == old_prog) { WRITE_ONCE(*prog, &dummy_bpf_prog.prog); break; } } int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, struct bpf_prog *exclude_prog, struct bpf_prog *include_prog, struct bpf_prog_array **new_array) { int new_prog_cnt, carry_prog_cnt = 0; struct bpf_prog **existing_prog; struct bpf_prog_array *array; int new_prog_idx = 0; /* Figure out how many existing progs we need to carry over to * the new array. */ if (old_array) { existing_prog = old_array->progs; for (; *existing_prog; existing_prog++) { if (*existing_prog != exclude_prog && *existing_prog != &dummy_bpf_prog.prog) carry_prog_cnt++; if (*existing_prog == include_prog) return -EEXIST; } } /* How many progs (not NULL) will be in the new array? */ new_prog_cnt = carry_prog_cnt; if (include_prog) new_prog_cnt += 1; /* Do we have any prog (not NULL) in the new array? */ if (!new_prog_cnt) { *new_array = NULL; return 0; } /* +1 as the end of prog_array is marked with NULL */ array = bpf_prog_array_alloc(new_prog_cnt + 1, GFP_KERNEL); if (!array) return -ENOMEM; /* Fill in the new prog array */ if (carry_prog_cnt) { existing_prog = old_array->progs; for (; *existing_prog; existing_prog++) if (*existing_prog != exclude_prog && *existing_prog != &dummy_bpf_prog.prog) array->progs[new_prog_idx++] = *existing_prog; } if (include_prog) array->progs[new_prog_idx++] = include_prog; array->progs[new_prog_idx] = NULL; *new_array = array; return 0; } int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, __u32 __user *prog_ids, u32 request_cnt, __u32 __user *prog_cnt) { u32 cnt = 0; if (array) cnt = bpf_prog_array_length(array); if (copy_to_user(prog_cnt, &cnt, sizeof(cnt))) return -EFAULT; /* return early if user requested only program count or nothing to copy */ if (!request_cnt || !cnt) return 0; return bpf_prog_array_copy_to_user(array, prog_ids, request_cnt); } static void bpf_prog_free_deferred(struct work_struct *work) { struct bpf_prog_aux *aux; aux = container_of(work, struct bpf_prog_aux, work); if (bpf_prog_is_dev_bound(aux)) bpf_prog_offload_destroy(aux->prog); bpf_jit_free(aux->prog); } /* Free internal BPF program */ void bpf_prog_free(struct bpf_prog *fp) { struct bpf_prog_aux *aux = fp->aux; INIT_WORK(&aux->work, bpf_prog_free_deferred); schedule_work(&aux->work); } EXPORT_SYMBOL_GPL(bpf_prog_free); /* RNG for unpriviledged user space with separated state from prandom_u32(). */ static DEFINE_PER_CPU(struct rnd_state, bpf_user_rnd_state); void bpf_user_rnd_init_once(void) { prandom_init_once(&bpf_user_rnd_state); } BPF_CALL_0(bpf_user_rnd_u32) { /* Should someone ever have the rather unwise idea to use some * of the registers passed into this function, then note that * this function is called from native eBPF and classic-to-eBPF * transformations. Register assignments from both sides are * different, f.e. classic always sets fn(ctx, A, X) here. */ struct rnd_state *state; u32 res; state = &get_cpu_var(bpf_user_rnd_state); res = prandom_u32_state(state); put_cpu_var(bpf_user_rnd_state); return res; } /* Weak definitions of helper functions in case we don't have bpf syscall. */ const struct bpf_func_proto bpf_map_lookup_elem_proto __weak; const struct bpf_func_proto bpf_map_update_elem_proto __weak; const struct bpf_func_proto bpf_map_delete_elem_proto __weak; const struct bpf_func_proto bpf_get_prandom_u32_proto __weak; const struct bpf_func_proto bpf_get_smp_processor_id_proto __weak; const struct bpf_func_proto bpf_get_numa_node_id_proto __weak; const struct bpf_func_proto bpf_ktime_get_ns_proto __weak; const struct bpf_func_proto bpf_get_current_pid_tgid_proto __weak; const struct bpf_func_proto bpf_get_current_uid_gid_proto __weak; const struct bpf_func_proto bpf_get_current_comm_proto __weak; const struct bpf_func_proto bpf_sock_map_update_proto __weak; const struct bpf_func_proto * __weak bpf_get_trace_printk_proto(void) { return NULL; } u64 __weak bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy) { return -ENOTSUPP; } /* Always built-in helper functions. */ const struct bpf_func_proto bpf_tail_call_proto = { .func = NULL, .gpl_only = false, .ret_type = RET_VOID, .arg1_type = ARG_PTR_TO_CTX, .arg2_type = ARG_CONST_MAP_PTR, .arg3_type = ARG_ANYTHING, }; /* Stub for JITs that only support cBPF. eBPF programs are interpreted. * It is encouraged to implement bpf_int_jit_compile() instead, so that * eBPF and implicitly also cBPF can get JITed! */ struct bpf_prog * __weak bpf_int_jit_compile(struct bpf_prog *prog) { return prog; } /* Stub for JITs that support eBPF. All cBPF code gets transformed into * eBPF by the kernel and is later compiled by bpf_int_jit_compile(). */ void __weak bpf_jit_compile(struct bpf_prog *prog) { } bool __weak bpf_helper_changes_pkt_data(void *func) { return false; } /* To execute LD_ABS/LD_IND instructions __bpf_prog_run() may call * skb_copy_bits(), so provide a weak definition of it for NET-less config. */ int __weak skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len) { return -EFAULT; } /* All definitions of tracepoints related to BPF. */ #define CREATE_TRACE_POINTS #include EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_exception); /* These are only used within the BPF_SYSCALL code */ #ifdef CONFIG_BPF_SYSCALL EXPORT_TRACEPOINT_SYMBOL_GPL(bpf_prog_get_type); EXPORT_TRACEPOINT_SYMBOL_GPL(bpf_prog_put_rcu); #endif