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Diffstat (limited to 'net/netfilter/nft_cmp.c')
-rw-r--r--net/netfilter/nft_cmp.c225
1 files changed, 184 insertions, 41 deletions
diff --git a/net/netfilter/nft_cmp.c b/net/netfilter/nft_cmp.c
index 8a28c127effc..963cf831799c 100644
--- a/net/netfilter/nft_cmp.c
+++ b/net/netfilter/nft_cmp.c
@@ -18,7 +18,7 @@
struct nft_cmp_expr {
struct nft_data data;
- enum nft_registers sreg:8;
+ u8 sreg;
u8 len;
enum nft_cmp_ops op:8;
};
@@ -43,7 +43,7 @@ void nft_cmp_eval(const struct nft_expr *expr,
case NFT_CMP_LT:
if (d == 0)
goto mismatch;
- /* fall through */
+ fallthrough;
case NFT_CMP_LTE:
if (d > 0)
goto mismatch;
@@ -51,7 +51,7 @@ void nft_cmp_eval(const struct nft_expr *expr,
case NFT_CMP_GT:
if (d == 0)
goto mismatch;
- /* fall through */
+ fallthrough;
case NFT_CMP_GTE:
if (d < 0)
goto mismatch;
@@ -73,22 +73,17 @@ static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_cmp_expr *priv = nft_expr_priv(expr);
- struct nft_data_desc desc;
+ struct nft_data_desc desc = {
+ .type = NFT_DATA_VALUE,
+ .size = sizeof(priv->data),
+ };
int err;
- err = nft_data_init(NULL, &priv->data, sizeof(priv->data), &desc,
- tb[NFTA_CMP_DATA]);
+ err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_CMP_DATA]);
if (err < 0)
return err;
- if (desc.type != NFT_DATA_VALUE) {
- err = -EINVAL;
- nft_data_release(&priv->data, desc.type);
- return err;
- }
-
- priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
- err = nft_validate_register_load(priv->sreg, desc.len);
+ err = nft_parse_register_load(tb[NFTA_CMP_SREG], &priv->sreg, desc.len);
if (err < 0)
return err;
@@ -115,19 +110,56 @@ nla_put_failure:
return -1;
}
+union nft_cmp_offload_data {
+ u16 val16;
+ u32 val32;
+ u64 val64;
+};
+
+static void nft_payload_n2h(union nft_cmp_offload_data *data,
+ const u8 *val, u32 len)
+{
+ switch (len) {
+ case 2:
+ data->val16 = ntohs(*((__be16 *)val));
+ break;
+ case 4:
+ data->val32 = ntohl(*((__be32 *)val));
+ break;
+ case 8:
+ data->val64 = be64_to_cpu(*((__be64 *)val));
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+}
+
static int __nft_cmp_offload(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_cmp_expr *priv)
{
struct nft_offload_reg *reg = &ctx->regs[priv->sreg];
+ union nft_cmp_offload_data _data, _datamask;
u8 *mask = (u8 *)&flow->match.mask;
u8 *key = (u8 *)&flow->match.key;
+ u8 *data, *datamask;
- if (priv->op != NFT_CMP_EQ || reg->len != priv->len)
+ if (priv->op != NFT_CMP_EQ || priv->len > reg->len)
return -EOPNOTSUPP;
- memcpy(key + reg->offset, &priv->data, priv->len);
- memcpy(mask + reg->offset, &reg->mask, priv->len);
+ if (reg->flags & NFT_OFFLOAD_F_NETWORK2HOST) {
+ nft_payload_n2h(&_data, (u8 *)&priv->data, reg->len);
+ nft_payload_n2h(&_datamask, (u8 *)&reg->mask, reg->len);
+ data = (u8 *)&_data;
+ datamask = (u8 *)&_datamask;
+ } else {
+ data = (u8 *)&priv->data;
+ datamask = (u8 *)&reg->mask;
+ }
+
+ memcpy(key + reg->offset, data, reg->len);
+ memcpy(mask + reg->offset, datamask, reg->len);
flow->match.dissector.used_keys |= BIT(reg->key);
flow->match.dissector.offset[reg->key] = reg->base_offset;
@@ -137,7 +169,7 @@ static int __nft_cmp_offload(struct nft_offload_ctx *ctx,
nft_reg_load16(priv->data.data) != ARPHRD_ETHER)
return -EOPNOTSUPP;
- nft_offload_update_dependency(ctx, &priv->data, priv->len);
+ nft_offload_update_dependency(ctx, &priv->data, reg->len);
return 0;
}
@@ -157,34 +189,48 @@ static const struct nft_expr_ops nft_cmp_ops = {
.eval = nft_cmp_eval,
.init = nft_cmp_init,
.dump = nft_cmp_dump,
+ .reduce = NFT_REDUCE_READONLY,
.offload = nft_cmp_offload,
};
+/* Calculate the mask for the nft_cmp_fast expression. On big endian the
+ * mask needs to include the *upper* bytes when interpreting that data as
+ * something smaller than the full u32, therefore a cpu_to_le32 is done.
+ */
+static u32 nft_cmp_fast_mask(unsigned int len)
+{
+ __le32 mask = cpu_to_le32(~0U >> (sizeof_field(struct nft_cmp_fast_expr,
+ data) * BITS_PER_BYTE - len));
+
+ return (__force u32)mask;
+}
+
static int nft_cmp_fast_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
- struct nft_data_desc desc;
struct nft_data data;
- u32 mask;
+ struct nft_data_desc desc = {
+ .type = NFT_DATA_VALUE,
+ .size = sizeof(data),
+ };
int err;
- err = nft_data_init(NULL, &data, sizeof(data), &desc,
- tb[NFTA_CMP_DATA]);
+ err = nft_data_init(NULL, &data, &desc, tb[NFTA_CMP_DATA]);
if (err < 0)
return err;
- priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
- err = nft_validate_register_load(priv->sreg, desc.len);
+ err = nft_parse_register_load(tb[NFTA_CMP_SREG], &priv->sreg, desc.len);
if (err < 0)
return err;
desc.len *= BITS_PER_BYTE;
- mask = nft_cmp_fast_mask(desc.len);
- priv->data = data.data[0] & mask;
+ priv->mask = nft_cmp_fast_mask(desc.len);
+ priv->data = data.data[0] & priv->mask;
priv->len = desc.len;
+ priv->inv = ntohl(nla_get_be32(tb[NFTA_CMP_OP])) != NFT_CMP_EQ;
return 0;
}
@@ -201,7 +247,7 @@ static int nft_cmp_fast_offload(struct nft_offload_ctx *ctx,
},
.sreg = priv->sreg,
.len = priv->len / BITS_PER_BYTE,
- .op = NFT_CMP_EQ,
+ .op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ,
};
return __nft_cmp_offload(ctx, flow, &cmp);
@@ -210,11 +256,12 @@ static int nft_cmp_fast_offload(struct nft_offload_ctx *ctx,
static int nft_cmp_fast_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
+ enum nft_cmp_ops op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ;
struct nft_data data;
if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
goto nla_put_failure;
- if (nla_put_be32(skb, NFTA_CMP_OP, htonl(NFT_CMP_EQ)))
+ if (nla_put_be32(skb, NFTA_CMP_OP, htonl(op)))
goto nla_put_failure;
data.data[0] = priv->data;
@@ -233,15 +280,113 @@ const struct nft_expr_ops nft_cmp_fast_ops = {
.eval = NULL, /* inlined */
.init = nft_cmp_fast_init,
.dump = nft_cmp_fast_dump,
+ .reduce = NFT_REDUCE_READONLY,
.offload = nft_cmp_fast_offload,
};
+static u32 nft_cmp_mask(u32 bitlen)
+{
+ return (__force u32)cpu_to_le32(~0U >> (sizeof(u32) * BITS_PER_BYTE - bitlen));
+}
+
+static void nft_cmp16_fast_mask(struct nft_data *data, unsigned int bitlen)
+{
+ int len = bitlen / BITS_PER_BYTE;
+ int i, words = len / sizeof(u32);
+
+ for (i = 0; i < words; i++) {
+ data->data[i] = 0xffffffff;
+ bitlen -= sizeof(u32) * BITS_PER_BYTE;
+ }
+
+ if (len % sizeof(u32))
+ data->data[i++] = nft_cmp_mask(bitlen);
+
+ for (; i < 4; i++)
+ data->data[i] = 0;
+}
+
+static int nft_cmp16_fast_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ struct nft_cmp16_fast_expr *priv = nft_expr_priv(expr);
+ struct nft_data_desc desc = {
+ .type = NFT_DATA_VALUE,
+ .size = sizeof(priv->data),
+ };
+ int err;
+
+ err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_CMP_DATA]);
+ if (err < 0)
+ return err;
+
+ err = nft_parse_register_load(tb[NFTA_CMP_SREG], &priv->sreg, desc.len);
+ if (err < 0)
+ return err;
+
+ nft_cmp16_fast_mask(&priv->mask, desc.len * BITS_PER_BYTE);
+ priv->inv = ntohl(nla_get_be32(tb[NFTA_CMP_OP])) != NFT_CMP_EQ;
+ priv->len = desc.len;
+
+ return 0;
+}
+
+static int nft_cmp16_fast_offload(struct nft_offload_ctx *ctx,
+ struct nft_flow_rule *flow,
+ const struct nft_expr *expr)
+{
+ const struct nft_cmp16_fast_expr *priv = nft_expr_priv(expr);
+ struct nft_cmp_expr cmp = {
+ .data = priv->data,
+ .sreg = priv->sreg,
+ .len = priv->len,
+ .op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ,
+ };
+
+ return __nft_cmp_offload(ctx, flow, &cmp);
+}
+
+static int nft_cmp16_fast_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+ const struct nft_cmp16_fast_expr *priv = nft_expr_priv(expr);
+ enum nft_cmp_ops op = priv->inv ? NFT_CMP_NEQ : NFT_CMP_EQ;
+
+ if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
+ goto nla_put_failure;
+ if (nla_put_be32(skb, NFTA_CMP_OP, htonl(op)))
+ goto nla_put_failure;
+
+ if (nft_data_dump(skb, NFTA_CMP_DATA, &priv->data,
+ NFT_DATA_VALUE, priv->len) < 0)
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+
+const struct nft_expr_ops nft_cmp16_fast_ops = {
+ .type = &nft_cmp_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_cmp16_fast_expr)),
+ .eval = NULL, /* inlined */
+ .init = nft_cmp16_fast_init,
+ .dump = nft_cmp16_fast_dump,
+ .reduce = NFT_REDUCE_READONLY,
+ .offload = nft_cmp16_fast_offload,
+};
+
static const struct nft_expr_ops *
nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
{
- struct nft_data_desc desc;
struct nft_data data;
+ struct nft_data_desc desc = {
+ .type = NFT_DATA_VALUE,
+ .size = sizeof(data),
+ };
enum nft_cmp_ops op;
+ u8 sreg;
int err;
if (tb[NFTA_CMP_SREG] == NULL ||
@@ -262,23 +407,21 @@ nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
return ERR_PTR(-EINVAL);
}
- err = nft_data_init(NULL, &data, sizeof(data), &desc,
- tb[NFTA_CMP_DATA]);
+ err = nft_data_init(NULL, &data, &desc, tb[NFTA_CMP_DATA]);
if (err < 0)
return ERR_PTR(err);
- if (desc.type != NFT_DATA_VALUE) {
- err = -EINVAL;
- goto err1;
- }
-
- if (desc.len <= sizeof(u32) && op == NFT_CMP_EQ)
- return &nft_cmp_fast_ops;
+ sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
+ if (op == NFT_CMP_EQ || op == NFT_CMP_NEQ) {
+ if (desc.len <= sizeof(u32))
+ return &nft_cmp_fast_ops;
+ else if (desc.len <= sizeof(data) &&
+ ((sreg >= NFT_REG_1 && sreg <= NFT_REG_4) ||
+ (sreg >= NFT_REG32_00 && sreg <= NFT_REG32_12 && sreg % 2 == 0)))
+ return &nft_cmp16_fast_ops;
+ }
return &nft_cmp_ops;
-err1:
- nft_data_release(&data, desc.type);
- return ERR_PTR(-EINVAL);
}
struct nft_expr_type nft_cmp_type __read_mostly = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.