bpf: implement ld_abs/ld_ind in native bpf
The main part of this work is to finally allow removal of LD_ABS and LD_IND from the BPF core by reimplementing them through native eBPF instead. Both LD_ABS/LD_IND were carried over from cBPF and keeping them around in native eBPF caused way more trouble than actually worth it. To just list some of the security issues in the past: *fdfaf64e75("x86: bpf_jit: support negative offsets") *35607b02db("sparc: bpf_jit: fix loads from negative offsets") *e0ee9c1215("x86: bpf_jit: fix two bugs in eBPF JIT compiler") *07aee94394("bpf, sparc: fix usage of wrong reg for load_skb_regs after call") *6d59b7dbf7("bpf, s390x: do not reload skb pointers in non-skb context") *87338c8e2c("bpf, ppc64: do not reload skb pointers in non-skb context") For programs in native eBPF, LD_ABS/LD_IND are pretty much legacy these days due to their limitations and more efficient/flexible alternatives that have been developed over time such as direct packet access. LD_ABS/LD_IND only cover 1/2/4 byte loads into a register, the load happens in host endianness and its exception handling can yield unexpected behavior. The latter is explained in depth inf6b1b3bf0d("bpf: fix subprog verifier bypass by div/mod by 0 exception") with similar cases of exceptions we had. In native eBPF more recent program types will disable LD_ABS/LD_IND altogether through may_access_skb() in verifier, and given the limitations in terms of exception handling, it's also disabled in programs that use BPF to BPF calls. In terms of cBPF, the LD_ABS/LD_IND is used in networking programs to access packet data. It is not used in seccomp-BPF but programs that use it for socket filtering or reuseport for demuxing with cBPF. This is mostly relevant for applications that have not yet migrated to native eBPF. The main complexity and source of bugs in LD_ABS/LD_IND is coming from their implementation in the various JITs. Most of them keep the model around from cBPF times by implementing a fastpath written in asm. They use typically two from the BPF program hidden CPU registers for caching the skb's headlen (skb->len - skb->data_len) and skb->data. Throughout the JIT phase this requires to keep track whether LD_ABS/LD_IND are used and if so, the two registers need to be recached each time a BPF helper would change the underlying packet data in native eBPF case. At least in eBPF case, available CPU registers are rare and the additional exit path out of the asm written JIT helper makes it also inflexible since not all parts of the JITer are in control from plain C. A LD_ABS/LD_IND implementation in eBPF therefore allows to significantly reduce the complexity in JITs with comparable performance results for them, e.g.: test_bpf tcpdump port 22 tcpdump complex x64 - before 15 21 10 14 19 18 - after 7 10 10 7 10 15 arm64 - before 40 91 92 40 91 151 - after 51 64 73 51 62 113 For cBPF we now track any usage of LD_ABS/LD_IND in bpf_convert_filter() and cache the skb's headlen and data in the cBPF prologue. The BPF_REG_TMP gets remapped from R8 to R2 since it's mainly just used as a local temporary variable. This allows to shrink the image on x86_64 also for seccomp programs slightly since mapping to %rsi is not an ereg. In callee-saved R8 and R9 we now track skb data and headlen, respectively. For normal prologue emission in the JITs this does not add any extra instructions since R8, R9 are pushed to stack in any case from eBPF side. cBPF uses the convert_bpf_ld_abs() emitter which probes the fast path inline already and falls back to bpf_skb_load_helper_{8,16,32}() helper relying on the cached skb data and headlen as well. R8 and R9 never need to be reloaded due to bpf_helper_changes_pkt_data() since all skb access in cBPF is read-only. Then, for the case of native eBPF, we use the bpf_gen_ld_abs() emitter, which calls the bpf_skb_load_helper_{8,16,32}_no_cache() helper unconditionally, does neither cache skb data and headlen nor has an inlined fast path. The reason for the latter is that native eBPF does not have any extra registers available anyway, but even if there were, it avoids any reload of skb data and headlen in the first place. Additionally, for the negative offsets, we provide an alternative bpf_skb_load_bytes_relative() helper in eBPF which operates similarly as bpf_skb_load_bytes() and allows for more flexibility. Tested myself on x64, arm64, s390x, from Sandipan on ppc64. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann
Alexei Starovoitov
Родитель
93731ef086
Коммит
e0cea7ce98
|
|
@ -235,6 +235,8 @@ struct bpf_verifier_ops {
|
|||
struct bpf_insn_access_aux *info);
|
||||
int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
|
||||
const struct bpf_prog *prog);
|
||||
int (*gen_ld_abs)(const struct bpf_insn *orig,
|
||||
struct bpf_insn *insn_buf);
|
||||
u32 (*convert_ctx_access)(enum bpf_access_type type,
|
||||
const struct bpf_insn *src,
|
||||
struct bpf_insn *dst,
|
||||
|
|
|
|||
|
|
@ -47,7 +47,9 @@ struct xdp_buff;
|
|||
/* Additional register mappings for converted user programs. */
|
||||
#define BPF_REG_A BPF_REG_0
|
||||
#define BPF_REG_X BPF_REG_7
|
||||
#define BPF_REG_TMP BPF_REG_8
|
||||
#define BPF_REG_TMP BPF_REG_2 /* scratch reg */
|
||||
#define BPF_REG_D BPF_REG_8 /* data, callee-saved */
|
||||
#define BPF_REG_H BPF_REG_9 /* hlen, callee-saved */
|
||||
|
||||
/* Kernel hidden auxiliary/helper register for hardening step.
|
||||
* Only used by eBPF JITs. It's nothing more than a temporary
|
||||
|
|
|
|||
|
|
@ -634,23 +634,6 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from,
|
|||
*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);
|
||||
|
|
@ -891,14 +874,7 @@ EXPORT_SYMBOL_GPL(__bpf_call_base);
|
|||
INSN_3(LDX, MEM, W), \
|
||||
INSN_3(LDX, MEM, DW), \
|
||||
/* Immediate based. */ \
|
||||
INSN_3(LD, IMM, DW), \
|
||||
/* Misc (old cBPF carry-over). */ \
|
||||
INSN_3(LD, ABS, B), \
|
||||
INSN_3(LD, ABS, H), \
|
||||
INSN_3(LD, ABS, W), \
|
||||
INSN_3(LD, IND, B), \
|
||||
INSN_3(LD, IND, H), \
|
||||
INSN_3(LD, IND, W)
|
||||
INSN_3(LD, IMM, DW)
|
||||
|
||||
bool bpf_opcode_in_insntable(u8 code)
|
||||
{
|
||||
|
|
@ -908,6 +884,13 @@ bool bpf_opcode_in_insntable(u8 code)
|
|||
[0 ... 255] = false,
|
||||
/* Now overwrite non-defaults ... */
|
||||
BPF_INSN_MAP(BPF_INSN_2_TBL, BPF_INSN_3_TBL),
|
||||
/* UAPI exposed, but rewritten opcodes. cBPF carry-over. */
|
||||
[BPF_LD | BPF_ABS | BPF_B] = true,
|
||||
[BPF_LD | BPF_ABS | BPF_H] = true,
|
||||
[BPF_LD | BPF_ABS | BPF_W] = true,
|
||||
[BPF_LD | BPF_IND | BPF_B] = true,
|
||||
[BPF_LD | BPF_IND | BPF_H] = true,
|
||||
[BPF_LD | BPF_IND | BPF_W] = true,
|
||||
};
|
||||
#undef BPF_INSN_3_TBL
|
||||
#undef BPF_INSN_2_TBL
|
||||
|
|
@ -938,8 +921,6 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack)
|
|||
#undef BPF_INSN_3_LBL
|
||||
#undef BPF_INSN_2_LBL
|
||||
u32 tail_call_cnt = 0;
|
||||
void *ptr;
|
||||
int off;
|
||||
|
||||
#define CONT ({ insn++; goto select_insn; })
|
||||
#define CONT_JMP ({ insn++; goto select_insn; })
|
||||
|
|
@ -1266,67 +1247,6 @@ out:
|
|||
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. Die hard here
|
||||
|
|
|
|||
|
|
@ -3884,6 +3884,11 @@ static int check_ld_abs(struct bpf_verifier_env *env, struct bpf_insn *insn)
|
|||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!env->ops->gen_ld_abs) {
|
||||
verbose(env, "bpf verifier is misconfigured\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (env->subprog_cnt) {
|
||||
/* when program has LD_ABS insn JITs and interpreter assume
|
||||
* that r1 == ctx == skb which is not the case for callees
|
||||
|
|
@ -5519,6 +5524,25 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env)
|
|||
continue;
|
||||
}
|
||||
|
||||
if (BPF_CLASS(insn->code) == BPF_LD &&
|
||||
(BPF_MODE(insn->code) == BPF_ABS ||
|
||||
BPF_MODE(insn->code) == BPF_IND)) {
|
||||
cnt = env->ops->gen_ld_abs(insn, insn_buf);
|
||||
if (cnt == 0 || cnt >= ARRAY_SIZE(insn_buf)) {
|
||||
verbose(env, "bpf verifier is misconfigured\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, cnt);
|
||||
if (!new_prog)
|
||||
return -ENOMEM;
|
||||
|
||||
delta += cnt - 1;
|
||||
env->prog = prog = new_prog;
|
||||
insn = new_prog->insnsi + i + delta;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (insn->code != (BPF_JMP | BPF_CALL))
|
||||
continue;
|
||||
if (insn->src_reg == BPF_PSEUDO_CALL)
|
||||
|
|
|
|||
|
|
@ -162,6 +162,87 @@ BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
|
|||
return 0;
|
||||
}
|
||||
|
||||
BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *,
|
||||
data, int, headlen, int, offset)
|
||||
{
|
||||
u8 tmp, *ptr;
|
||||
const int len = sizeof(tmp);
|
||||
|
||||
if (offset >= 0) {
|
||||
if (headlen - offset >= len)
|
||||
return *(u8 *)(data + offset);
|
||||
if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
|
||||
return tmp;
|
||||
} else {
|
||||
ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
|
||||
if (likely(ptr))
|
||||
return *(u8 *)ptr;
|
||||
}
|
||||
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb,
|
||||
int, offset)
|
||||
{
|
||||
return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len,
|
||||
offset);
|
||||
}
|
||||
|
||||
BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *,
|
||||
data, int, headlen, int, offset)
|
||||
{
|
||||
u16 tmp, *ptr;
|
||||
const int len = sizeof(tmp);
|
||||
|
||||
if (offset >= 0) {
|
||||
if (headlen - offset >= len)
|
||||
return get_unaligned_be16(data + offset);
|
||||
if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
|
||||
return be16_to_cpu(tmp);
|
||||
} else {
|
||||
ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
|
||||
if (likely(ptr))
|
||||
return get_unaligned_be16(ptr);
|
||||
}
|
||||
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb,
|
||||
int, offset)
|
||||
{
|
||||
return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len,
|
||||
offset);
|
||||
}
|
||||
|
||||
BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *,
|
||||
data, int, headlen, int, offset)
|
||||
{
|
||||
u32 tmp, *ptr;
|
||||
const int len = sizeof(tmp);
|
||||
|
||||
if (likely(offset >= 0)) {
|
||||
if (headlen - offset >= len)
|
||||
return get_unaligned_be32(data + offset);
|
||||
if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
|
||||
return be32_to_cpu(tmp);
|
||||
} else {
|
||||
ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
|
||||
if (likely(ptr))
|
||||
return get_unaligned_be32(ptr);
|
||||
}
|
||||
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb,
|
||||
int, offset)
|
||||
{
|
||||
return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len,
|
||||
offset);
|
||||
}
|
||||
|
||||
BPF_CALL_0(bpf_get_raw_cpu_id)
|
||||
{
|
||||
return raw_smp_processor_id();
|
||||
|
|
@ -354,26 +435,87 @@ static bool convert_bpf_extensions(struct sock_filter *fp,
|
|||
return true;
|
||||
}
|
||||
|
||||
static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp)
|
||||
{
|
||||
const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS);
|
||||
int size = bpf_size_to_bytes(BPF_SIZE(fp->code));
|
||||
bool endian = BPF_SIZE(fp->code) == BPF_H ||
|
||||
BPF_SIZE(fp->code) == BPF_W;
|
||||
bool indirect = BPF_MODE(fp->code) == BPF_IND;
|
||||
const int ip_align = NET_IP_ALIGN;
|
||||
struct bpf_insn *insn = *insnp;
|
||||
int offset = fp->k;
|
||||
|
||||
if (!indirect &&
|
||||
((unaligned_ok && offset >= 0) ||
|
||||
(!unaligned_ok && offset >= 0 &&
|
||||
offset + ip_align >= 0 &&
|
||||
offset + ip_align % size == 0))) {
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H);
|
||||
*insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset);
|
||||
*insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, size, 2 + endian);
|
||||
*insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, BPF_REG_D,
|
||||
offset);
|
||||
if (endian)
|
||||
*insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8);
|
||||
*insn++ = BPF_JMP_A(8);
|
||||
}
|
||||
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D);
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H);
|
||||
if (!indirect) {
|
||||
*insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset);
|
||||
} else {
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X);
|
||||
if (fp->k)
|
||||
*insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset);
|
||||
}
|
||||
|
||||
switch (BPF_SIZE(fp->code)) {
|
||||
case BPF_B:
|
||||
*insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8);
|
||||
break;
|
||||
case BPF_H:
|
||||
*insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16);
|
||||
break;
|
||||
case BPF_W:
|
||||
*insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32);
|
||||
break;
|
||||
default:
|
||||
return false;
|
||||
}
|
||||
|
||||
*insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2);
|
||||
*insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
|
||||
*insn = BPF_EXIT_INSN();
|
||||
|
||||
*insnp = insn;
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* bpf_convert_filter - convert filter program
|
||||
* @prog: the user passed filter program
|
||||
* @len: the length of the user passed filter program
|
||||
* @new_prog: allocated 'struct bpf_prog' or NULL
|
||||
* @new_len: pointer to store length of converted program
|
||||
* @seen_ld_abs: bool whether we've seen ld_abs/ind
|
||||
*
|
||||
* Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
|
||||
* style extended BPF (eBPF).
|
||||
* Conversion workflow:
|
||||
*
|
||||
* 1) First pass for calculating the new program length:
|
||||
* bpf_convert_filter(old_prog, old_len, NULL, &new_len)
|
||||
* bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
|
||||
*
|
||||
* 2) 2nd pass to remap in two passes: 1st pass finds new
|
||||
* jump offsets, 2nd pass remapping:
|
||||
* bpf_convert_filter(old_prog, old_len, new_prog, &new_len);
|
||||
* bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
|
||||
*/
|
||||
static int bpf_convert_filter(struct sock_filter *prog, int len,
|
||||
struct bpf_prog *new_prog, int *new_len)
|
||||
struct bpf_prog *new_prog, int *new_len,
|
||||
bool *seen_ld_abs)
|
||||
{
|
||||
int new_flen = 0, pass = 0, target, i, stack_off;
|
||||
struct bpf_insn *new_insn, *first_insn = NULL;
|
||||
|
|
@ -412,12 +554,27 @@ do_pass:
|
|||
* do this ourself. Initial CTX is present in BPF_REG_ARG1.
|
||||
*/
|
||||
*new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
|
||||
if (*seen_ld_abs) {
|
||||
/* For packet access in classic BPF, cache skb->data
|
||||
* in callee-saved BPF R8 and skb->len - skb->data_len
|
||||
* (headlen) in BPF R9. Since classic BPF is read-only
|
||||
* on CTX, we only need to cache it once.
|
||||
*/
|
||||
*new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
|
||||
BPF_REG_D, BPF_REG_CTX,
|
||||
offsetof(struct sk_buff, data));
|
||||
*new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX,
|
||||
offsetof(struct sk_buff, len));
|
||||
*new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX,
|
||||
offsetof(struct sk_buff, data_len));
|
||||
*new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP);
|
||||
}
|
||||
} else {
|
||||
new_insn += 3;
|
||||
}
|
||||
|
||||
for (i = 0; i < len; fp++, i++) {
|
||||
struct bpf_insn tmp_insns[6] = { };
|
||||
struct bpf_insn tmp_insns[32] = { };
|
||||
struct bpf_insn *insn = tmp_insns;
|
||||
|
||||
if (addrs)
|
||||
|
|
@ -460,6 +617,11 @@ do_pass:
|
|||
BPF_MODE(fp->code) == BPF_ABS &&
|
||||
convert_bpf_extensions(fp, &insn))
|
||||
break;
|
||||
if (BPF_CLASS(fp->code) == BPF_LD &&
|
||||
convert_bpf_ld_abs(fp, &insn)) {
|
||||
*seen_ld_abs = true;
|
||||
break;
|
||||
}
|
||||
|
||||
if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
|
||||
fp->code == (BPF_ALU | BPF_MOD | BPF_X)) {
|
||||
|
|
@ -562,21 +724,31 @@ jmp_rest:
|
|||
break;
|
||||
|
||||
/* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
|
||||
case BPF_LDX | BPF_MSH | BPF_B:
|
||||
/* tmp = A */
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_A);
|
||||
case BPF_LDX | BPF_MSH | BPF_B: {
|
||||
struct sock_filter tmp = {
|
||||
.code = BPF_LD | BPF_ABS | BPF_B,
|
||||
.k = fp->k,
|
||||
};
|
||||
|
||||
*seen_ld_abs = true;
|
||||
|
||||
/* X = A */
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
|
||||
/* A = BPF_R0 = *(u8 *) (skb->data + K) */
|
||||
*insn++ = BPF_LD_ABS(BPF_B, fp->k);
|
||||
convert_bpf_ld_abs(&tmp, &insn);
|
||||
insn++;
|
||||
/* A &= 0xf */
|
||||
*insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
|
||||
/* A <<= 2 */
|
||||
*insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
|
||||
/* tmp = X */
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X);
|
||||
/* X = A */
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
|
||||
/* A = tmp */
|
||||
*insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
|
||||
break;
|
||||
|
||||
}
|
||||
/* RET_K is remaped into 2 insns. RET_A case doesn't need an
|
||||
* extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
|
||||
*/
|
||||
|
|
@ -658,6 +830,8 @@ jmp_rest:
|
|||
if (!new_prog) {
|
||||
/* Only calculating new length. */
|
||||
*new_len = new_insn - first_insn;
|
||||
if (*seen_ld_abs)
|
||||
*new_len += 4; /* Prologue bits. */
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -1019,6 +1193,7 @@ static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
|
|||
struct sock_filter *old_prog;
|
||||
struct bpf_prog *old_fp;
|
||||
int err, new_len, old_len = fp->len;
|
||||
bool seen_ld_abs = false;
|
||||
|
||||
/* We are free to overwrite insns et al right here as it
|
||||
* won't be used at this point in time anymore internally
|
||||
|
|
@ -1040,7 +1215,8 @@ static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
|
|||
}
|
||||
|
||||
/* 1st pass: calculate the new program length. */
|
||||
err = bpf_convert_filter(old_prog, old_len, NULL, &new_len);
|
||||
err = bpf_convert_filter(old_prog, old_len, NULL, &new_len,
|
||||
&seen_ld_abs);
|
||||
if (err)
|
||||
goto out_err_free;
|
||||
|
||||
|
|
@ -1059,7 +1235,8 @@ static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
|
|||
fp->len = new_len;
|
||||
|
||||
/* 2nd pass: remap sock_filter insns into bpf_insn insns. */
|
||||
err = bpf_convert_filter(old_prog, old_len, fp, &new_len);
|
||||
err = bpf_convert_filter(old_prog, old_len, fp, &new_len,
|
||||
&seen_ld_abs);
|
||||
if (err)
|
||||
/* 2nd bpf_convert_filter() can fail only if it fails
|
||||
* to allocate memory, remapping must succeed. Note,
|
||||
|
|
@ -4330,6 +4507,41 @@ static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
|
|||
return insn - insn_buf;
|
||||
}
|
||||
|
||||
static int bpf_gen_ld_abs(const struct bpf_insn *orig,
|
||||
struct bpf_insn *insn_buf)
|
||||
{
|
||||
bool indirect = BPF_MODE(orig->code) == BPF_IND;
|
||||
struct bpf_insn *insn = insn_buf;
|
||||
|
||||
/* We're guaranteed here that CTX is in R6. */
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
|
||||
if (!indirect) {
|
||||
*insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm);
|
||||
} else {
|
||||
*insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg);
|
||||
if (orig->imm)
|
||||
*insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm);
|
||||
}
|
||||
|
||||
switch (BPF_SIZE(orig->code)) {
|
||||
case BPF_B:
|
||||
*insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache);
|
||||
break;
|
||||
case BPF_H:
|
||||
*insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache);
|
||||
break;
|
||||
case BPF_W:
|
||||
*insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache);
|
||||
break;
|
||||
}
|
||||
|
||||
*insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2);
|
||||
*insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0);
|
||||
*insn++ = BPF_EXIT_INSN();
|
||||
|
||||
return insn - insn_buf;
|
||||
}
|
||||
|
||||
static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
|
||||
const struct bpf_prog *prog)
|
||||
{
|
||||
|
|
@ -5599,6 +5811,7 @@ const struct bpf_verifier_ops sk_filter_verifier_ops = {
|
|||
.get_func_proto = sk_filter_func_proto,
|
||||
.is_valid_access = sk_filter_is_valid_access,
|
||||
.convert_ctx_access = bpf_convert_ctx_access,
|
||||
.gen_ld_abs = bpf_gen_ld_abs,
|
||||
};
|
||||
|
||||
const struct bpf_prog_ops sk_filter_prog_ops = {
|
||||
|
|
@ -5610,6 +5823,7 @@ const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
|
|||
.is_valid_access = tc_cls_act_is_valid_access,
|
||||
.convert_ctx_access = tc_cls_act_convert_ctx_access,
|
||||
.gen_prologue = tc_cls_act_prologue,
|
||||
.gen_ld_abs = bpf_gen_ld_abs,
|
||||
};
|
||||
|
||||
const struct bpf_prog_ops tc_cls_act_prog_ops = {
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче