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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0f3cd9b3 PNA |
2 | /* |
3 | * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org> | |
0f3cd9b3 PNA |
4 | */ |
5 | ||
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> | |
14 | ||
15 | struct nft_range_expr { | |
16 | struct nft_data data_from; | |
17 | struct nft_data data_to; | |
4f16d25c | 18 | u8 sreg; |
0f3cd9b3 PNA |
19 | u8 len; |
20 | enum nft_range_ops op:8; | |
21 | }; | |
22 | ||
10870dd8 FW |
23 | void nft_range_eval(const struct nft_expr *expr, |
24 | struct nft_regs *regs, const struct nft_pktinfo *pkt) | |
0f3cd9b3 PNA |
25 | { |
26 | const struct nft_range_expr *priv = nft_expr_priv(expr); | |
0f3cd9b3 PNA |
27 | int d1, d2; |
28 | ||
29 | d1 = memcmp(®s->data[priv->sreg], &priv->data_from, priv->len); | |
30 | d2 = memcmp(®s->data[priv->sreg], &priv->data_to, priv->len); | |
31 | switch (priv->op) { | |
32 | case NFT_RANGE_EQ: | |
d2e4d593 AB |
33 | if (d1 < 0 || d2 > 0) |
34 | regs->verdict.code = NFT_BREAK; | |
0f3cd9b3 PNA |
35 | break; |
36 | case NFT_RANGE_NEQ: | |
d2e4d593 AB |
37 | if (d1 >= 0 && d2 <= 0) |
38 | regs->verdict.code = NFT_BREAK; | |
0f3cd9b3 PNA |
39 | break; |
40 | } | |
0f3cd9b3 PNA |
41 | } |
42 | ||
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 }, | |
48 | }; | |
49 | ||
50 | static int nft_range_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
51 | const struct nlattr * const tb[]) | |
52 | { | |
53 | struct nft_range_expr *priv = nft_expr_priv(expr); | |
54 | struct nft_data_desc desc_from, desc_to; | |
55 | int err; | |
ccca6607 | 56 | u32 op; |
0f3cd9b3 | 57 | |
49cdc4c7 LZ |
58 | if (!tb[NFTA_RANGE_SREG] || |
59 | !tb[NFTA_RANGE_OP] || | |
60 | !tb[NFTA_RANGE_FROM_DATA] || | |
61 | !tb[NFTA_RANGE_TO_DATA]) | |
62 | return -EINVAL; | |
63 | ||
0f3cd9b3 PNA |
64 | err = nft_data_init(NULL, &priv->data_from, sizeof(priv->data_from), |
65 | &desc_from, tb[NFTA_RANGE_FROM_DATA]); | |
66 | if (err < 0) | |
67 | return err; | |
68 | ||
0d2c96af PNA |
69 | if (desc_from.type != NFT_DATA_VALUE) { |
70 | err = -EINVAL; | |
71 | goto err1; | |
72 | } | |
73 | ||
0f3cd9b3 PNA |
74 | err = nft_data_init(NULL, &priv->data_to, sizeof(priv->data_to), |
75 | &desc_to, tb[NFTA_RANGE_TO_DATA]); | |
76 | if (err < 0) | |
77 | goto err1; | |
78 | ||
0d2c96af PNA |
79 | if (desc_to.type != NFT_DATA_VALUE) { |
80 | err = -EINVAL; | |
81 | goto err2; | |
82 | } | |
83 | ||
0f3cd9b3 PNA |
84 | if (desc_from.len != desc_to.len) { |
85 | err = -EINVAL; | |
86 | goto err2; | |
87 | } | |
88 | ||
4f16d25c PNA |
89 | err = nft_parse_register_load(tb[NFTA_RANGE_SREG], &priv->sreg, |
90 | desc_from.len); | |
0f3cd9b3 PNA |
91 | if (err < 0) |
92 | goto err2; | |
93 | ||
ccca6607 PNA |
94 | err = nft_parse_u32_check(tb[NFTA_RANGE_OP], U8_MAX, &op); |
95 | if (err < 0) | |
96 | goto err2; | |
97 | ||
98 | switch (op) { | |
99 | case NFT_RANGE_EQ: | |
100 | case NFT_RANGE_NEQ: | |
101 | break; | |
102 | default: | |
103 | err = -EINVAL; | |
104 | goto err2; | |
105 | } | |
106 | ||
107 | priv->op = op; | |
0f3cd9b3 PNA |
108 | priv->len = desc_from.len; |
109 | return 0; | |
110 | err2: | |
59105446 | 111 | nft_data_release(&priv->data_to, desc_to.type); |
0f3cd9b3 | 112 | err1: |
59105446 | 113 | nft_data_release(&priv->data_from, desc_from.type); |
0f3cd9b3 PNA |
114 | return err; |
115 | } | |
116 | ||
117 | static int nft_range_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
118 | { | |
119 | const struct nft_range_expr *priv = nft_expr_priv(expr); | |
120 | ||
121 | if (nft_dump_register(skb, NFTA_RANGE_SREG, priv->sreg)) | |
122 | goto nla_put_failure; | |
123 | if (nla_put_be32(skb, NFTA_RANGE_OP, htonl(priv->op))) | |
124 | goto nla_put_failure; | |
125 | ||
126 | if (nft_data_dump(skb, NFTA_RANGE_FROM_DATA, &priv->data_from, | |
127 | NFT_DATA_VALUE, priv->len) < 0 || | |
128 | nft_data_dump(skb, NFTA_RANGE_TO_DATA, &priv->data_to, | |
129 | NFT_DATA_VALUE, priv->len) < 0) | |
130 | goto nla_put_failure; | |
131 | return 0; | |
132 | ||
133 | nla_put_failure: | |
134 | return -1; | |
135 | } | |
136 | ||
0f3cd9b3 PNA |
137 | static const struct nft_expr_ops nft_range_ops = { |
138 | .type = &nft_range_type, | |
139 | .size = NFT_EXPR_SIZE(sizeof(struct nft_range_expr)), | |
140 | .eval = nft_range_eval, | |
141 | .init = nft_range_init, | |
142 | .dump = nft_range_dump, | |
143 | }; | |
144 | ||
4e24877e | 145 | struct nft_expr_type nft_range_type __read_mostly = { |
0f3cd9b3 PNA |
146 | .name = "range", |
147 | .ops = &nft_range_ops, | |
148 | .policy = nft_range_policy, | |
149 | .maxattr = NFTA_RANGE_MAX, | |
150 | .owner = THIS_MODULE, | |
151 | }; |