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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
96518518 | 2 | /* |
ef1f7df9 | 3 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
96518518 | 4 | * |
96518518 PM |
5 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
6 | */ | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/netlink.h> | |
12 | #include <linux/netfilter.h> | |
13 | #include <linux/netfilter/nf_tables.h> | |
14 | #include <net/netfilter/nf_tables_core.h> | |
15 | #include <net/netfilter/nf_tables.h> | |
bd8699e9 | 16 | #include <net/netfilter/nf_tables_offload.h> |
96518518 PM |
17 | |
18 | struct nft_bitwise { | |
19 | enum nft_registers sreg:8; | |
20 | enum nft_registers dreg:8; | |
9d1f9799 | 21 | enum nft_bitwise_ops op:8; |
96518518 PM |
22 | u8 len; |
23 | struct nft_data mask; | |
24 | struct nft_data xor; | |
25 | }; | |
26 | ||
10870dd8 FW |
27 | void nft_bitwise_eval(const struct nft_expr *expr, |
28 | struct nft_regs *regs, const struct nft_pktinfo *pkt) | |
96518518 PM |
29 | { |
30 | const struct nft_bitwise *priv = nft_expr_priv(expr); | |
49499c3e PM |
31 | const u32 *src = ®s->data[priv->sreg]; |
32 | u32 *dst = ®s->data[priv->dreg]; | |
96518518 PM |
33 | unsigned int i; |
34 | ||
fad136ea PM |
35 | for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++) |
36 | dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i]; | |
96518518 PM |
37 | } |
38 | ||
39 | static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = { | |
40 | [NFTA_BITWISE_SREG] = { .type = NLA_U32 }, | |
41 | [NFTA_BITWISE_DREG] = { .type = NLA_U32 }, | |
42 | [NFTA_BITWISE_LEN] = { .type = NLA_U32 }, | |
43 | [NFTA_BITWISE_MASK] = { .type = NLA_NESTED }, | |
44 | [NFTA_BITWISE_XOR] = { .type = NLA_NESTED }, | |
9d1f9799 | 45 | [NFTA_BITWISE_OP] = { .type = NLA_U32 }, |
96518518 PM |
46 | }; |
47 | ||
48 | static int nft_bitwise_init(const struct nft_ctx *ctx, | |
49 | const struct nft_expr *expr, | |
50 | const struct nlattr * const tb[]) | |
51 | { | |
52 | struct nft_bitwise *priv = nft_expr_priv(expr); | |
53 | struct nft_data_desc d1, d2; | |
36b701fa | 54 | u32 len; |
96518518 PM |
55 | int err; |
56 | ||
265ec7b0 JS |
57 | if (!tb[NFTA_BITWISE_SREG] || |
58 | !tb[NFTA_BITWISE_DREG] || | |
59 | !tb[NFTA_BITWISE_LEN] || | |
60 | !tb[NFTA_BITWISE_MASK] || | |
61 | !tb[NFTA_BITWISE_XOR]) | |
96518518 PM |
62 | return -EINVAL; |
63 | ||
36b701fa LGL |
64 | err = nft_parse_u32_check(tb[NFTA_BITWISE_LEN], U8_MAX, &len); |
65 | if (err < 0) | |
66 | return err; | |
67 | ||
68 | priv->len = len; | |
69 | ||
b1c96ed3 | 70 | priv->sreg = nft_parse_register(tb[NFTA_BITWISE_SREG]); |
d07db988 | 71 | err = nft_validate_register_load(priv->sreg, priv->len); |
96518518 PM |
72 | if (err < 0) |
73 | return err; | |
74 | ||
b1c96ed3 | 75 | priv->dreg = nft_parse_register(tb[NFTA_BITWISE_DREG]); |
1ec10212 PM |
76 | err = nft_validate_register_store(ctx, priv->dreg, NULL, |
77 | NFT_DATA_VALUE, priv->len); | |
96518518 PM |
78 | if (err < 0) |
79 | return err; | |
80 | ||
9d1f9799 JS |
81 | if (tb[NFTA_BITWISE_OP]) { |
82 | priv->op = ntohl(nla_get_be32(tb[NFTA_BITWISE_OP])); | |
83 | switch (priv->op) { | |
84 | case NFT_BITWISE_BOOL: | |
85 | break; | |
86 | default: | |
87 | return -EOPNOTSUPP; | |
88 | } | |
89 | } else { | |
90 | priv->op = NFT_BITWISE_BOOL; | |
91 | } | |
92 | ||
d0a11fc3 PM |
93 | err = nft_data_init(NULL, &priv->mask, sizeof(priv->mask), &d1, |
94 | tb[NFTA_BITWISE_MASK]); | |
96518518 PM |
95 | if (err < 0) |
96 | return err; | |
0d2c96af | 97 | if (d1.type != NFT_DATA_VALUE || d1.len != priv->len) { |
71df14b0 PNA |
98 | err = -EINVAL; |
99 | goto err1; | |
100 | } | |
96518518 | 101 | |
d0a11fc3 PM |
102 | err = nft_data_init(NULL, &priv->xor, sizeof(priv->xor), &d2, |
103 | tb[NFTA_BITWISE_XOR]); | |
96518518 | 104 | if (err < 0) |
71df14b0 | 105 | goto err1; |
0d2c96af | 106 | if (d2.type != NFT_DATA_VALUE || d2.len != priv->len) { |
71df14b0 PNA |
107 | err = -EINVAL; |
108 | goto err2; | |
109 | } | |
96518518 PM |
110 | |
111 | return 0; | |
71df14b0 | 112 | err2: |
59105446 | 113 | nft_data_release(&priv->xor, d2.type); |
71df14b0 | 114 | err1: |
59105446 | 115 | nft_data_release(&priv->mask, d1.type); |
71df14b0 | 116 | return err; |
96518518 PM |
117 | } |
118 | ||
119 | static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
120 | { | |
121 | const struct nft_bitwise *priv = nft_expr_priv(expr); | |
122 | ||
b1c96ed3 | 123 | if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg)) |
577c734a | 124 | return -1; |
b1c96ed3 | 125 | if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg)) |
577c734a | 126 | return -1; |
96518518 | 127 | if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len))) |
577c734a | 128 | return -1; |
9d1f9799 JS |
129 | if (nla_put_be32(skb, NFTA_BITWISE_OP, htonl(priv->op))) |
130 | return -1; | |
96518518 PM |
131 | |
132 | if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask, | |
133 | NFT_DATA_VALUE, priv->len) < 0) | |
577c734a | 134 | return -1; |
96518518 PM |
135 | |
136 | if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor, | |
137 | NFT_DATA_VALUE, priv->len) < 0) | |
577c734a | 138 | return -1; |
96518518 PM |
139 | |
140 | return 0; | |
96518518 PM |
141 | } |
142 | ||
bd8699e9 PNA |
143 | static struct nft_data zero; |
144 | ||
145 | static int nft_bitwise_offload(struct nft_offload_ctx *ctx, | |
fbf19ddf JS |
146 | struct nft_flow_rule *flow, |
147 | const struct nft_expr *expr) | |
bd8699e9 PNA |
148 | { |
149 | const struct nft_bitwise *priv = nft_expr_priv(expr); | |
de2a6052 | 150 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; |
bd8699e9 | 151 | |
83c156d3 | 152 | if (memcmp(&priv->xor, &zero, sizeof(priv->xor)) || |
de2a6052 | 153 | priv->sreg != priv->dreg || priv->len != reg->len) |
bd8699e9 PNA |
154 | return -EOPNOTSUPP; |
155 | ||
de2a6052 | 156 | memcpy(®->mask, &priv->mask, sizeof(priv->mask)); |
bd8699e9 PNA |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
ef1f7df9 PM |
161 | static const struct nft_expr_ops nft_bitwise_ops = { |
162 | .type = &nft_bitwise_type, | |
96518518 | 163 | .size = NFT_EXPR_SIZE(sizeof(struct nft_bitwise)), |
96518518 PM |
164 | .eval = nft_bitwise_eval, |
165 | .init = nft_bitwise_init, | |
166 | .dump = nft_bitwise_dump, | |
bd8699e9 | 167 | .offload = nft_bitwise_offload, |
ef1f7df9 PM |
168 | }; |
169 | ||
4e24877e | 170 | struct nft_expr_type nft_bitwise_type __read_mostly = { |
ef1f7df9 PM |
171 | .name = "bitwise", |
172 | .ops = &nft_bitwise_ops, | |
96518518 PM |
173 | .policy = nft_bitwise_policy, |
174 | .maxattr = NFTA_BITWISE_MAX, | |
ef1f7df9 | 175 | .owner = THIS_MODULE, |
96518518 | 176 | }; |