1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
6 #include <linux/kernel.h>
7 #include <linux/init.h>
8 #include <linux/module.h>
9 #include <linux/netlink.h>
10 #include <linux/netfilter.h>
11 #include <linux/netfilter/nf_tables.h>
12 #include <net/netfilter/nf_tables_core.h>
13 #include <net/netfilter/nf_tables.h>
15 struct nft_range_expr {
16 struct nft_data data_from;
17 struct nft_data data_to;
18 enum nft_registers sreg:8;
20 enum nft_range_ops op:8;
23 void nft_range_eval(const struct nft_expr *expr,
24 struct nft_regs *regs, const struct nft_pktinfo *pkt)
26 const struct nft_range_expr *priv = nft_expr_priv(expr);
29 d1 = memcmp(®s->data[priv->sreg], &priv->data_from, priv->len);
30 d2 = memcmp(®s->data[priv->sreg], &priv->data_to, priv->len);
34 regs->verdict.code = NFT_BREAK;
37 if (d1 >= 0 && d2 <= 0)
38 regs->verdict.code = NFT_BREAK;
43 static const struct nla_policy nft_range_policy[NFTA_RANGE_MAX + 1] = {
44 [NFTA_RANGE_SREG] = { .type = NLA_U32 },
45 [NFTA_RANGE_OP] = { .type = NLA_U32 },
46 [NFTA_RANGE_FROM_DATA] = { .type = NLA_NESTED },
47 [NFTA_RANGE_TO_DATA] = { .type = NLA_NESTED },
50 static int nft_range_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
51 const struct nlattr * const tb[])
53 struct nft_range_expr *priv = nft_expr_priv(expr);
54 struct nft_data_desc desc_from, desc_to;
58 if (!tb[NFTA_RANGE_SREG] ||
60 !tb[NFTA_RANGE_FROM_DATA] ||
61 !tb[NFTA_RANGE_TO_DATA])
64 err = nft_data_init(NULL, &priv->data_from, sizeof(priv->data_from),
65 &desc_from, tb[NFTA_RANGE_FROM_DATA]);
69 err = nft_data_init(NULL, &priv->data_to, sizeof(priv->data_to),
70 &desc_to, tb[NFTA_RANGE_TO_DATA]);
74 if (desc_from.len != desc_to.len) {
79 priv->sreg = nft_parse_register(tb[NFTA_RANGE_SREG]);
80 err = nft_validate_register_load(priv->sreg, desc_from.len);
84 err = nft_parse_u32_check(tb[NFTA_RANGE_OP], U8_MAX, &op);
98 priv->len = desc_from.len;
101 nft_data_release(&priv->data_to, desc_to.type);
103 nft_data_release(&priv->data_from, desc_from.type);
107 static int nft_range_dump(struct sk_buff *skb, const struct nft_expr *expr)
109 const struct nft_range_expr *priv = nft_expr_priv(expr);
111 if (nft_dump_register(skb, NFTA_RANGE_SREG, priv->sreg))
112 goto nla_put_failure;
113 if (nla_put_be32(skb, NFTA_RANGE_OP, htonl(priv->op)))
114 goto nla_put_failure;
116 if (nft_data_dump(skb, NFTA_RANGE_FROM_DATA, &priv->data_from,
117 NFT_DATA_VALUE, priv->len) < 0 ||
118 nft_data_dump(skb, NFTA_RANGE_TO_DATA, &priv->data_to,
119 NFT_DATA_VALUE, priv->len) < 0)
120 goto nla_put_failure;
127 static const struct nft_expr_ops nft_range_ops = {
128 .type = &nft_range_type,
129 .size = NFT_EXPR_SIZE(sizeof(struct nft_range_expr)),
130 .eval = nft_range_eval,
131 .init = nft_range_init,
132 .dump = nft_range_dump,
135 struct nft_expr_type nft_range_type __read_mostly = {
137 .ops = &nft_range_ops,
138 .policy = nft_range_policy,
139 .maxattr = NFTA_RANGE_MAX,
140 .owner = THIS_MODULE,