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96518518 | 1 | /* |
ef1f7df9 | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/netlink.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/netfilter/nf_tables.h> | |
17 | #include <net/netfilter/nf_tables_core.h> | |
18 | #include <net/netfilter/nf_tables.h> | |
19 | ||
20 | struct nft_byteorder { | |
21 | enum nft_registers sreg:8; | |
22 | enum nft_registers dreg:8; | |
23 | enum nft_byteorder_ops op:8; | |
24 | u8 len; | |
25 | u8 size; | |
26 | }; | |
27 | ||
28 | static void nft_byteorder_eval(const struct nft_expr *expr, | |
a55e22e9 | 29 | struct nft_regs *regs, |
96518518 PM |
30 | const struct nft_pktinfo *pkt) |
31 | { | |
32 | const struct nft_byteorder *priv = nft_expr_priv(expr); | |
49499c3e PM |
33 | u32 *src = ®s->data[priv->sreg]; |
34 | u32 *dst = ®s->data[priv->dreg]; | |
96518518 PM |
35 | union { u32 u32; u16 u16; } *s, *d; |
36 | unsigned int i; | |
37 | ||
fad136ea PM |
38 | s = (void *)src; |
39 | d = (void *)dst; | |
96518518 PM |
40 | |
41 | switch (priv->size) { | |
42 | case 4: | |
43 | switch (priv->op) { | |
44 | case NFT_BYTEORDER_NTOH: | |
45 | for (i = 0; i < priv->len / 4; i++) | |
46 | d[i].u32 = ntohl((__force __be32)s[i].u32); | |
47 | break; | |
48 | case NFT_BYTEORDER_HTON: | |
49 | for (i = 0; i < priv->len / 4; i++) | |
50 | d[i].u32 = (__force __u32)htonl(s[i].u32); | |
51 | break; | |
52 | } | |
53 | break; | |
54 | case 2: | |
55 | switch (priv->op) { | |
56 | case NFT_BYTEORDER_NTOH: | |
57 | for (i = 0; i < priv->len / 2; i++) | |
58 | d[i].u16 = ntohs((__force __be16)s[i].u16); | |
59 | break; | |
60 | case NFT_BYTEORDER_HTON: | |
61 | for (i = 0; i < priv->len / 2; i++) | |
62 | d[i].u16 = (__force __u16)htons(s[i].u16); | |
63 | break; | |
64 | } | |
65 | break; | |
66 | } | |
67 | } | |
68 | ||
69 | static const struct nla_policy nft_byteorder_policy[NFTA_BYTEORDER_MAX + 1] = { | |
70 | [NFTA_BYTEORDER_SREG] = { .type = NLA_U32 }, | |
71 | [NFTA_BYTEORDER_DREG] = { .type = NLA_U32 }, | |
72 | [NFTA_BYTEORDER_OP] = { .type = NLA_U32 }, | |
73 | [NFTA_BYTEORDER_LEN] = { .type = NLA_U32 }, | |
74 | [NFTA_BYTEORDER_SIZE] = { .type = NLA_U32 }, | |
75 | }; | |
76 | ||
77 | static int nft_byteorder_init(const struct nft_ctx *ctx, | |
78 | const struct nft_expr *expr, | |
79 | const struct nlattr * const tb[]) | |
80 | { | |
81 | struct nft_byteorder *priv = nft_expr_priv(expr); | |
82 | int err; | |
83 | ||
84 | if (tb[NFTA_BYTEORDER_SREG] == NULL || | |
85 | tb[NFTA_BYTEORDER_DREG] == NULL || | |
86 | tb[NFTA_BYTEORDER_LEN] == NULL || | |
87 | tb[NFTA_BYTEORDER_SIZE] == NULL || | |
88 | tb[NFTA_BYTEORDER_OP] == NULL) | |
89 | return -EINVAL; | |
90 | ||
96518518 PM |
91 | priv->op = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_OP])); |
92 | switch (priv->op) { | |
93 | case NFT_BYTEORDER_NTOH: | |
94 | case NFT_BYTEORDER_HTON: | |
95 | break; | |
96 | default: | |
97 | return -EINVAL; | |
98 | } | |
99 | ||
96518518 PM |
100 | priv->size = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SIZE])); |
101 | switch (priv->size) { | |
102 | case 2: | |
103 | case 4: | |
104 | break; | |
105 | default: | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
b1c96ed3 | 109 | priv->sreg = nft_parse_register(tb[NFTA_BYTEORDER_SREG]); |
d07db988 PM |
110 | priv->len = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN])); |
111 | err = nft_validate_register_load(priv->sreg, priv->len); | |
45d9bcda PM |
112 | if (err < 0) |
113 | return err; | |
114 | ||
b1c96ed3 | 115 | priv->dreg = nft_parse_register(tb[NFTA_BYTEORDER_DREG]); |
27e6d201 PM |
116 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
117 | NFT_DATA_VALUE, priv->len); | |
96518518 PM |
118 | } |
119 | ||
120 | static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
121 | { | |
122 | const struct nft_byteorder *priv = nft_expr_priv(expr); | |
123 | ||
b1c96ed3 | 124 | if (nft_dump_register(skb, NFTA_BYTEORDER_SREG, priv->sreg)) |
96518518 | 125 | goto nla_put_failure; |
b1c96ed3 | 126 | if (nft_dump_register(skb, NFTA_BYTEORDER_DREG, priv->dreg)) |
96518518 PM |
127 | goto nla_put_failure; |
128 | if (nla_put_be32(skb, NFTA_BYTEORDER_OP, htonl(priv->op))) | |
129 | goto nla_put_failure; | |
130 | if (nla_put_be32(skb, NFTA_BYTEORDER_LEN, htonl(priv->len))) | |
131 | goto nla_put_failure; | |
132 | if (nla_put_be32(skb, NFTA_BYTEORDER_SIZE, htonl(priv->size))) | |
133 | goto nla_put_failure; | |
134 | return 0; | |
135 | ||
136 | nla_put_failure: | |
137 | return -1; | |
138 | } | |
139 | ||
ef1f7df9 PM |
140 | static struct nft_expr_type nft_byteorder_type; |
141 | static const struct nft_expr_ops nft_byteorder_ops = { | |
142 | .type = &nft_byteorder_type, | |
96518518 | 143 | .size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)), |
96518518 PM |
144 | .eval = nft_byteorder_eval, |
145 | .init = nft_byteorder_init, | |
146 | .dump = nft_byteorder_dump, | |
ef1f7df9 PM |
147 | }; |
148 | ||
149 | static struct nft_expr_type nft_byteorder_type __read_mostly = { | |
150 | .name = "byteorder", | |
151 | .ops = &nft_byteorder_ops, | |
96518518 PM |
152 | .policy = nft_byteorder_policy, |
153 | .maxattr = NFTA_BYTEORDER_MAX, | |
ef1f7df9 | 154 | .owner = THIS_MODULE, |
96518518 PM |
155 | }; |
156 | ||
157 | int __init nft_byteorder_module_init(void) | |
158 | { | |
ef1f7df9 | 159 | return nft_register_expr(&nft_byteorder_type); |
96518518 PM |
160 | } |
161 | ||
162 | void nft_byteorder_module_exit(void) | |
163 | { | |
ef1f7df9 | 164 | nft_unregister_expr(&nft_byteorder_type); |
96518518 | 165 | } |