diff options
Diffstat (limited to 'net/netfilter/nft_bitwise.c')
-rw-r--r-- | net/netfilter/nft_bitwise.c | 172 |
1 files changed, 138 insertions, 34 deletions
diff --git a/net/netfilter/nft_bitwise.c b/net/netfilter/nft_bitwise.c index 47b0dba95054..e6e402b247d0 100644 --- a/net/netfilter/nft_bitwise.c +++ b/net/netfilter/nft_bitwise.c @@ -30,7 +30,7 @@ static void nft_bitwise_eval_bool(u32 *dst, const u32 *src, { unsigned int i; - for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++) + for (i = 0; i < DIV_ROUND_UP(priv->len, sizeof(u32)); i++) dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i]; } @@ -93,7 +93,16 @@ static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = { static int nft_bitwise_init_bool(struct nft_bitwise *priv, const struct nlattr *const tb[]) { - struct nft_data_desc mask, xor; + struct nft_data_desc mask = { + .type = NFT_DATA_VALUE, + .size = sizeof(priv->mask), + .len = priv->len, + }; + struct nft_data_desc xor = { + .type = NFT_DATA_VALUE, + .size = sizeof(priv->xor), + .len = priv->len, + }; int err; if (tb[NFTA_BITWISE_DATA]) @@ -103,36 +112,30 @@ static int nft_bitwise_init_bool(struct nft_bitwise *priv, !tb[NFTA_BITWISE_XOR]) return -EINVAL; - err = nft_data_init(NULL, &priv->mask, sizeof(priv->mask), &mask, - tb[NFTA_BITWISE_MASK]); + err = nft_data_init(NULL, &priv->mask, &mask, tb[NFTA_BITWISE_MASK]); if (err < 0) return err; - if (mask.type != NFT_DATA_VALUE || mask.len != priv->len) { - err = -EINVAL; - goto err1; - } - err = nft_data_init(NULL, &priv->xor, sizeof(priv->xor), &xor, - tb[NFTA_BITWISE_XOR]); + err = nft_data_init(NULL, &priv->xor, &xor, tb[NFTA_BITWISE_XOR]); if (err < 0) - goto err1; - if (xor.type != NFT_DATA_VALUE || xor.len != priv->len) { - err = -EINVAL; - goto err2; - } + goto err_xor_err; return 0; -err2: - nft_data_release(&priv->xor, xor.type); -err1: + +err_xor_err: nft_data_release(&priv->mask, mask.type); + return err; } static int nft_bitwise_init_shift(struct nft_bitwise *priv, const struct nlattr *const tb[]) { - struct nft_data_desc d; + struct nft_data_desc desc = { + .type = NFT_DATA_VALUE, + .size = sizeof(priv->data), + .len = sizeof(u32), + }; int err; if (tb[NFTA_BITWISE_MASK] || @@ -142,13 +145,12 @@ static int nft_bitwise_init_shift(struct nft_bitwise *priv, if (!tb[NFTA_BITWISE_DATA]) return -EINVAL; - err = nft_data_init(NULL, &priv->data, sizeof(priv->data), &d, - tb[NFTA_BITWISE_DATA]); + err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_BITWISE_DATA]); if (err < 0) return err; - if (d.type != NFT_DATA_VALUE || d.len != sizeof(u32) || - priv->data.data[0] >= BITS_PER_TYPE(u32)) { - nft_data_release(&priv->data, d.type); + + if (priv->data.data[0] >= BITS_PER_TYPE(u32)) { + nft_data_release(&priv->data, desc.type); return -EINVAL; } @@ -278,34 +280,81 @@ static int nft_bitwise_offload(struct nft_offload_ctx *ctx, return 0; } +static bool nft_bitwise_reduce(struct nft_regs_track *track, + const struct nft_expr *expr) +{ + const struct nft_bitwise *priv = nft_expr_priv(expr); + const struct nft_bitwise *bitwise; + unsigned int regcount; + u8 dreg; + int i; + + if (!track->regs[priv->sreg].selector) + return false; + + bitwise = nft_expr_priv(track->regs[priv->dreg].selector); + if (track->regs[priv->sreg].selector == track->regs[priv->dreg].selector && + track->regs[priv->sreg].num_reg == 0 && + track->regs[priv->dreg].bitwise && + track->regs[priv->dreg].bitwise->ops == expr->ops && + priv->sreg == bitwise->sreg && + priv->dreg == bitwise->dreg && + priv->op == bitwise->op && + priv->len == bitwise->len && + !memcmp(&priv->mask, &bitwise->mask, sizeof(priv->mask)) && + !memcmp(&priv->xor, &bitwise->xor, sizeof(priv->xor)) && + !memcmp(&priv->data, &bitwise->data, sizeof(priv->data))) { + track->cur = expr; + return true; + } + + if (track->regs[priv->sreg].bitwise || + track->regs[priv->sreg].num_reg != 0) { + nft_reg_track_cancel(track, priv->dreg, priv->len); + return false; + } + + if (priv->sreg != priv->dreg) { + nft_reg_track_update(track, track->regs[priv->sreg].selector, + priv->dreg, priv->len); + } + + dreg = priv->dreg; + regcount = DIV_ROUND_UP(priv->len, NFT_REG32_SIZE); + for (i = 0; i < regcount; i++, dreg++) + track->regs[priv->dreg].bitwise = expr; + + return false; +} + static const struct nft_expr_ops nft_bitwise_ops = { .type = &nft_bitwise_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_bitwise)), .eval = nft_bitwise_eval, .init = nft_bitwise_init, .dump = nft_bitwise_dump, + .reduce = nft_bitwise_reduce, .offload = nft_bitwise_offload, }; static int nft_bitwise_extract_u32_data(const struct nlattr * const tb, u32 *out) { - struct nft_data_desc desc; struct nft_data data; - int err = 0; + struct nft_data_desc desc = { + .type = NFT_DATA_VALUE, + .size = sizeof(data), + .len = sizeof(u32), + }; + int err; - err = nft_data_init(NULL, &data, sizeof(data), &desc, tb); + err = nft_data_init(NULL, &data, &desc, tb); if (err < 0) return err; - if (desc.type != NFT_DATA_VALUE || desc.len != sizeof(u32)) { - err = -EINVAL; - goto err; - } *out = data.data[0]; -err: - nft_data_release(&data, desc.type); - return err; + + return 0; } static int nft_bitwise_fast_init(const struct nft_ctx *ctx, @@ -385,12 +434,48 @@ static int nft_bitwise_fast_offload(struct nft_offload_ctx *ctx, return 0; } +static bool nft_bitwise_fast_reduce(struct nft_regs_track *track, + const struct nft_expr *expr) +{ + const struct nft_bitwise_fast_expr *priv = nft_expr_priv(expr); + const struct nft_bitwise_fast_expr *bitwise; + + if (!track->regs[priv->sreg].selector) + return false; + + bitwise = nft_expr_priv(track->regs[priv->dreg].selector); + if (track->regs[priv->sreg].selector == track->regs[priv->dreg].selector && + track->regs[priv->dreg].bitwise && + track->regs[priv->dreg].bitwise->ops == expr->ops && + priv->sreg == bitwise->sreg && + priv->dreg == bitwise->dreg && + priv->mask == bitwise->mask && + priv->xor == bitwise->xor) { + track->cur = expr; + return true; + } + + if (track->regs[priv->sreg].bitwise) { + nft_reg_track_cancel(track, priv->dreg, NFT_REG32_SIZE); + return false; + } + + if (priv->sreg != priv->dreg) { + track->regs[priv->dreg].selector = + track->regs[priv->sreg].selector; + } + track->regs[priv->dreg].bitwise = expr; + + return false; +} + const struct nft_expr_ops nft_bitwise_fast_ops = { .type = &nft_bitwise_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_bitwise_fast_expr)), .eval = NULL, /* inlined */ .init = nft_bitwise_fast_init, .dump = nft_bitwise_fast_dump, + .reduce = nft_bitwise_fast_reduce, .offload = nft_bitwise_fast_offload, }; @@ -427,3 +512,22 @@ struct nft_expr_type nft_bitwise_type __read_mostly = { .maxattr = NFTA_BITWISE_MAX, .owner = THIS_MODULE, }; + +bool nft_expr_reduce_bitwise(struct nft_regs_track *track, + const struct nft_expr *expr) +{ + const struct nft_expr *last = track->last; + const struct nft_expr *next; + + if (expr == last) + return false; + + next = nft_expr_next(expr); + if (next->ops == &nft_bitwise_ops) + return nft_bitwise_reduce(track, next); + else if (next->ops == &nft_bitwise_fast_ops) + return nft_bitwise_fast_reduce(track, next); + + return false; +} +EXPORT_SYMBOL_GPL(nft_expr_reduce_bitwise); |