// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2008-2009 Patrick McHardy * * Development of this code funded by Astaro AG (http://www.astaro.com/) */ #include #include #include #include #include #include #include #include #include struct nft_bitwise { u8 sreg; u8 dreg; enum nft_bitwise_ops op:8; u8 len; struct nft_data mask; struct nft_data xor; struct nft_data data; }; static void nft_bitwise_eval_bool(u32 *dst, const u32 *src, const struct nft_bitwise *priv) { unsigned int 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]; } static void nft_bitwise_eval_lshift(u32 *dst, const u32 *src, const struct nft_bitwise *priv) { u32 shift = priv->data.data[0]; unsigned int i; u32 carry = 0; for (i = DIV_ROUND_UP(priv->len, sizeof(u32)); i > 0; i--) { dst[i - 1] = (src[i - 1] << shift) | carry; carry = src[i - 1] >> (BITS_PER_TYPE(u32) - shift); } } static void nft_bitwise_eval_rshift(u32 *dst, const u32 *src, const struct nft_bitwise *priv) { u32 shift = priv->data.data[0]; unsigned int i; u32 carry = 0; for (i = 0; i < DIV_ROUND_UP(priv->len, sizeof(u32)); i++) { dst[i] = carry | (src[i] >> shift); carry = src[i] << (BITS_PER_TYPE(u32) - shift); } } void nft_bitwise_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt) { const struct nft_bitwise *priv = nft_expr_priv(expr); const u32 *src = ®s->data[priv->sreg]; u32 *dst = ®s->data[priv->dreg]; switch (priv->op) { case NFT_BITWISE_BOOL: nft_bitwise_eval_bool(dst, src, priv); break; case NFT_BITWISE_LSHIFT: nft_bitwise_eval_lshift(dst, src, priv); break; case NFT_BITWISE_RSHIFT: nft_bitwise_eval_rshift(dst, src, priv); break; } } static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = { [NFTA_BITWISE_SREG] = { .type = NLA_U32 }, [NFTA_BITWISE_DREG] = { .type = NLA_U32 }, [NFTA_BITWISE_LEN] = { .type = NLA_U32 }, [NFTA_BITWISE_MASK] = { .type = NLA_NESTED }, [NFTA_BITWISE_XOR] = { .type = NLA_NESTED }, [NFTA_BITWISE_OP] = { .type = NLA_U32 }, [NFTA_BITWISE_DATA] = { .type = NLA_NESTED }, }; static int nft_bitwise_init_bool(struct nft_bitwise *priv, const struct nlattr *const tb[]) { 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]) return -EINVAL; if (!tb[NFTA_BITWISE_MASK] || !tb[NFTA_BITWISE_XOR]) return -EINVAL; err = nft_data_init(NULL, &priv->mask, &mask, tb[NFTA_BITWISE_MASK]); if (err < 0) return err; err = nft_data_init(NULL, &priv->xor, &xor, tb[NFTA_BITWISE_XOR]); if (err < 0) goto err_xor_err; return 0; 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 desc = { .type = NFT_DATA_VALUE, .size = sizeof(priv->data), .len = sizeof(u32), }; int err; if (tb[NFTA_BITWISE_MASK] || tb[NFTA_BITWISE_XOR]) return -EINVAL; if (!tb[NFTA_BITWISE_DATA]) return -EINVAL; err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_BITWISE_DATA]); if (err < 0) return err; if (priv->data.data[0] >= BITS_PER_TYPE(u32)) { nft_data_release(&priv->data, desc.type); return -EINVAL; } return 0; } static int nft_bitwise_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_bitwise *priv = nft_expr_priv(expr); u32 len; int err; err = nft_parse_u32_check(tb[NFTA_BITWISE_LEN], U8_MAX, &len); if (err < 0) return err; priv->len = len; err = nft_parse_register_load(tb[NFTA_BITWISE_SREG], &priv->sreg, priv->len); if (err < 0) return err; err = nft_parse_register_store(ctx, tb[NFTA_BITWISE_DREG], &priv->dreg, NULL, NFT_DATA_VALUE, priv->len); if (err < 0) return err; if (tb[NFTA_BITWISE_OP]) { priv->op = ntohl(nla_get_be32(tb[NFTA_BITWISE_OP])); switch (priv->op) { case NFT_BITWISE_BOOL: case NFT_BITWISE_LSHIFT: case NFT_BITWISE_RSHIFT: break; default: return -EOPNOTSUPP; } } else { priv->op = NFT_BITWISE_BOOL; } switch(priv->op) { case NFT_BITWISE_BOOL: err = nft_bitwise_init_bool(priv, tb); break; case NFT_BITWISE_LSHIFT: case NFT_BITWISE_RSHIFT: err = nft_bitwise_init_shift(priv, tb); break; } return err; } static int nft_bitwise_dump_bool(struct sk_buff *skb, const struct nft_bitwise *priv) { if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask, NFT_DATA_VALUE, priv->len) < 0) return -1; if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor, NFT_DATA_VALUE, priv->len) < 0) return -1; return 0; } static int nft_bitwise_dump_shift(struct sk_buff *skb, const struct nft_bitwise *priv) { if (nft_data_dump(skb, NFTA_BITWISE_DATA, &priv->data, NFT_DATA_VALUE, sizeof(u32)) < 0) return -1; return 0; } static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_bitwise *priv = nft_expr_priv(expr); int err = 0; if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg)) return -1; if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg)) return -1; if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len))) return -1; if (nla_put_be32(skb, NFTA_BITWISE_OP, htonl(priv->op))) return -1; switch (priv->op) { case NFT_BITWISE_BOOL: err = nft_bitwise_dump_bool(skb, priv); break; case NFT_BITWISE_LSHIFT: case NFT_BITWISE_RSHIFT: err = nft_bitwise_dump_shift(skb, priv); break; } return err; } static struct nft_data zero; static int nft_bitwise_offload(struct nft_offload_ctx *ctx, struct nft_flow_rule *flow, const struct nft_expr *expr) { const struct nft_bitwise *priv = nft_expr_priv(expr); struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; if (priv->op != NFT_BITWISE_BOOL) return -EOPNOTSUPP; if (memcmp(&priv->xor, &zero, sizeof(priv->xor)) || priv->sreg != priv->dreg || priv->len != reg->len) return -EOPNOTSUPP; memcpy(®->mask, &priv->mask, sizeof(priv->mask)); 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 data; struct nft_data_desc desc = { .type = NFT_DATA_VALUE, .size = sizeof(data), .len = sizeof(u32), }; int err; err = nft_data_init(NULL, &data, &desc, tb); if (err < 0) return err; *out = data.data[0]; return 0; } static int nft_bitwise_fast_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_bitwise_fast_expr *priv = nft_expr_priv(expr); int err; err = nft_parse_register_load(tb[NFTA_BITWISE_SREG], &priv->sreg, sizeof(u32)); if (err < 0) return err; err = nft_parse_register_store(ctx, tb[NFTA_BITWISE_DREG], &priv->dreg, NULL, NFT_DATA_VALUE, sizeof(u32)); if (err < 0) return err; if (tb[NFTA_BITWISE_DATA]) return -EINVAL; if (!tb[NFTA_BITWISE_MASK] || !tb[NFTA_BITWISE_XOR]) return -EINVAL; err = nft_bitwise_extract_u32_data(tb[NFTA_BITWISE_MASK], &priv->mask); if (err < 0) return err; err = nft_bitwise_extract_u32_data(tb[NFTA_BITWISE_XOR], &priv->xor); if (err < 0) return err; return 0; } static int nft_bitwise_fast_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_bitwise_fast_expr *priv = nft_expr_priv(expr); struct nft_data data; if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg)) return -1; if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg)) return -1; if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(sizeof(u32)))) return -1; if (nla_put_be32(skb, NFTA_BITWISE_OP, htonl(NFT_BITWISE_BOOL))) return -1; data.data[0] = priv->mask; if (nft_data_dump(skb, NFTA_BITWISE_MASK, &data, NFT_DATA_VALUE, sizeof(u32)) < 0) return -1; data.data[0] = priv->xor; if (nft_data_dump(skb, NFTA_BITWISE_XOR, &data, NFT_DATA_VALUE, sizeof(u32)) < 0) return -1; return 0; } static int nft_bitwise_fast_offload(struct nft_offload_ctx *ctx, struct nft_flow_rule *flow, const struct nft_expr *expr) { const struct nft_bitwise_fast_expr *priv = nft_expr_priv(expr); struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; if (priv->xor || priv->sreg != priv->dreg || reg->len != sizeof(u32)) return -EOPNOTSUPP; reg->mask.data[0] = priv->mask; 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, }; static const struct nft_expr_ops * nft_bitwise_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[]) { int err; u32 len; if (!tb[NFTA_BITWISE_LEN] || !tb[NFTA_BITWISE_SREG] || !tb[NFTA_BITWISE_DREG]) return ERR_PTR(-EINVAL); err = nft_parse_u32_check(tb[NFTA_BITWISE_LEN], U8_MAX, &len); if (err < 0) return ERR_PTR(err); if (len != sizeof(u32)) return &nft_bitwise_ops; if (tb[NFTA_BITWISE_OP] && ntohl(nla_get_be32(tb[NFTA_BITWISE_OP])) != NFT_BITWISE_BOOL) return &nft_bitwise_ops; return &nft_bitwise_fast_ops; } struct nft_expr_type nft_bitwise_type __read_mostly = { .name = "bitwise", .select_ops = nft_bitwise_select_ops, .policy = nft_bitwise_policy, .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);