1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2013 Eric Leblond <eric@regit.org>
*
* Development of this code partly funded by OISF
* (http://www.openinfosecfoundation.org/)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/jhash.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_queue.h>
static u32 jhash_initval __read_mostly;
struct nft_queue {
u8 sreg_qnum;
u16 queuenum;
u16 queues_total;
u16 flags;
};
static void nft_queue_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_queue *priv = nft_expr_priv(expr);
u32 queue = priv->queuenum;
u32 ret;
if (priv->queues_total > 1) {
if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
int cpu = raw_smp_processor_id();
queue = priv->queuenum + cpu % priv->queues_total;
} else {
queue = nfqueue_hash(pkt->skb, queue,
priv->queues_total, nft_pf(pkt),
jhash_initval);
}
}
ret = NF_QUEUE_NR(queue);
if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
regs->verdict.code = ret;
}
static void nft_queue_sreg_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_queue *priv = nft_expr_priv(expr);
u32 queue, ret;
queue = regs->data[priv->sreg_qnum];
ret = NF_QUEUE_NR(queue);
if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
regs->verdict.code = ret;
}
static int nft_queue_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
static const unsigned int supported_hooks = ((1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_POST_ROUTING));
switch (ctx->family) {
case NFPROTO_IPV4:
case NFPROTO_IPV6:
case NFPROTO_INET:
case NFPROTO_BRIDGE:
break;
case NFPROTO_NETDEV: /* lacks okfn */
fallthrough;
default:
return -EOPNOTSUPP;
}
return nft_chain_validate_hooks(ctx->chain, supported_hooks);
}
static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
[NFTA_QUEUE_NUM] = { .type = NLA_U16 },
[NFTA_QUEUE_TOTAL] = { .type = NLA_U16 },
[NFTA_QUEUE_FLAGS] = { .type = NLA_U16 },
[NFTA_QUEUE_SREG_QNUM] = { .type = NLA_U32 },
};
static int nft_queue_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_queue *priv = nft_expr_priv(expr);
u32 maxid;
priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
if (tb[NFTA_QUEUE_TOTAL])
priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL]));
else
priv->queues_total = 1;
if (priv->queues_total == 0)
return -EINVAL;
maxid = priv->queues_total - 1 + priv->queuenum;
if (maxid > U16_MAX)
return -ERANGE;
if (tb[NFTA_QUEUE_FLAGS]) {
priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
return -EINVAL;
}
return 0;
}
static int nft_queue_sreg_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_queue *priv = nft_expr_priv(expr);
int err;
err = nft_parse_register_load(tb[NFTA_QUEUE_SREG_QNUM],
&priv->sreg_qnum, sizeof(u32));
if (err < 0)
return err;
if (tb[NFTA_QUEUE_FLAGS]) {
priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
return -EINVAL;
if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT)
return -EOPNOTSUPP;
}
return 0;
}
static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_queue *priv = nft_expr_priv(expr);
if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) ||
nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) ||
nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int
nft_queue_sreg_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_queue *priv = nft_expr_priv(expr);
if (nft_dump_register(skb, NFTA_QUEUE_SREG_QNUM, priv->sreg_qnum) ||
nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static struct nft_expr_type nft_queue_type;
static const struct nft_expr_ops nft_queue_ops = {
.type = &nft_queue_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
.eval = nft_queue_eval,
.init = nft_queue_init,
.dump = nft_queue_dump,
.validate = nft_queue_validate,
.reduce = NFT_REDUCE_READONLY,
};
static const struct nft_expr_ops nft_queue_sreg_ops = {
.type = &nft_queue_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
.eval = nft_queue_sreg_eval,
.init = nft_queue_sreg_init,
.dump = nft_queue_sreg_dump,
.validate = nft_queue_validate,
.reduce = NFT_REDUCE_READONLY,
};
static const struct nft_expr_ops *
nft_queue_select_ops(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
if (tb[NFTA_QUEUE_NUM] && tb[NFTA_QUEUE_SREG_QNUM])
return ERR_PTR(-EINVAL);
init_hashrandom(&jhash_initval);
if (tb[NFTA_QUEUE_NUM])
return &nft_queue_ops;
if (tb[NFTA_QUEUE_SREG_QNUM])
return &nft_queue_sreg_ops;
return ERR_PTR(-EINVAL);
}
static struct nft_expr_type nft_queue_type __read_mostly = {
.name = "queue",
.select_ops = nft_queue_select_ops,
.policy = nft_queue_policy,
.maxattr = NFTA_QUEUE_MAX,
.owner = THIS_MODULE,
};
static int __init nft_queue_module_init(void)
{
return nft_register_expr(&nft_queue_type);
}
static void __exit nft_queue_module_exit(void)
{
nft_unregister_expr(&nft_queue_type);
}
module_init(nft_queue_module_init);
module_exit(nft_queue_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Eric Leblond <eric@regit.org>");
MODULE_ALIAS_NFT_EXPR("queue");
MODULE_DESCRIPTION("Netfilter nftables queue module");
|
