1 /*
2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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
nft_immediate_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)20 static void nft_immediate_eval(const struct nft_expr *expr,
21 struct nft_regs *regs,
22 const struct nft_pktinfo *pkt)
23 {
24 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
25
26 nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen);
27 }
28
29 static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
30 [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 },
31 [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED },
32 };
33
nft_immediate_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])34 static int nft_immediate_init(const struct nft_ctx *ctx,
35 const struct nft_expr *expr,
36 const struct nlattr * const tb[])
37 {
38 struct nft_immediate_expr *priv = nft_expr_priv(expr);
39 struct nft_data_desc desc;
40 int err;
41
42 if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
43 tb[NFTA_IMMEDIATE_DATA] == NULL)
44 return -EINVAL;
45
46 err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc,
47 tb[NFTA_IMMEDIATE_DATA]);
48 if (err < 0)
49 return err;
50
51 priv->dlen = desc.len;
52
53 priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
54 err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
55 desc.type, desc.len);
56 if (err < 0)
57 goto err1;
58
59 return 0;
60
61 err1:
62 nft_data_release(&priv->data, desc.type);
63 return err;
64 }
65
nft_immediate_activate(const struct nft_ctx * ctx,const struct nft_expr * expr)66 static void nft_immediate_activate(const struct nft_ctx *ctx,
67 const struct nft_expr *expr)
68 {
69 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
70
71 return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg));
72 }
73
nft_immediate_deactivate(const struct nft_ctx * ctx,const struct nft_expr * expr)74 static void nft_immediate_deactivate(const struct nft_ctx *ctx,
75 const struct nft_expr *expr)
76 {
77 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
78
79 return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg));
80 }
81
nft_immediate_dump(struct sk_buff * skb,const struct nft_expr * expr)82 static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
83 {
84 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
85
86 if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
87 goto nla_put_failure;
88
89 return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
90 nft_dreg_to_type(priv->dreg), priv->dlen);
91
92 nla_put_failure:
93 return -1;
94 }
95
nft_immediate_validate(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nft_data ** d)96 static int nft_immediate_validate(const struct nft_ctx *ctx,
97 const struct nft_expr *expr,
98 const struct nft_data **d)
99 {
100 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
101 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
102 const struct nft_data *data;
103 int err;
104
105 if (priv->dreg != NFT_REG_VERDICT)
106 return 0;
107
108 data = &priv->data;
109
110 switch (data->verdict.code) {
111 case NFT_JUMP:
112 case NFT_GOTO:
113 pctx->level++;
114 err = nft_chain_validate(ctx, data->verdict.chain);
115 if (err < 0)
116 return err;
117 pctx->level--;
118 break;
119 default:
120 break;
121 }
122
123 return 0;
124 }
125
126 static const struct nft_expr_ops nft_imm_ops = {
127 .type = &nft_imm_type,
128 .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
129 .eval = nft_immediate_eval,
130 .init = nft_immediate_init,
131 .activate = nft_immediate_activate,
132 .deactivate = nft_immediate_deactivate,
133 .dump = nft_immediate_dump,
134 .validate = nft_immediate_validate,
135 };
136
137 struct nft_expr_type nft_imm_type __read_mostly = {
138 .name = "immediate",
139 .ops = &nft_imm_ops,
140 .policy = nft_immediate_policy,
141 .maxattr = NFTA_IMMEDIATE_MAX,
142 .owner = THIS_MODULE,
143 };
144
