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247 lines · 5.9 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2013 Eric Leblond <[email protected]>
4 *
5 * Development of this code partly funded by OISF
6 * (http://www.openinfosecfoundation.org/)
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/netlink.h>
13#include <linux/jhash.h>
14#include <linux/netfilter.h>
15#include <linux/netfilter/nf_tables.h>
16#include <net/netfilter/nf_tables.h>
17#include <net/netfilter/nf_queue.h>
18
19static u32 jhash_initval __read_mostly;
20
21struct nft_queue {
22 u8 sreg_qnum;
23 u16 queuenum;
24 u16 queues_total;
25 u16 flags;
26};
27
28static void nft_queue_eval(const struct nft_expr *expr,
29 struct nft_regs *regs,
30 const struct nft_pktinfo *pkt)
31{
32 struct nft_queue *priv = nft_expr_priv(expr);
33 u32 queue = priv->queuenum;
34 u32 ret;
35
36 if (priv->queues_total > 1) {
37 if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
38 int cpu = raw_smp_processor_id();
39
40 queue = priv->queuenum + cpu % priv->queues_total;
41 } else {
42 queue = nfqueue_hash(pkt->skb, queue,
43 priv->queues_total, nft_pf(pkt),
44 jhash_initval);
45 }
46 }
47
48 ret = NF_QUEUE_NR(queue);
49 if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
50 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
51
52 regs->verdict.code = ret;
53}
54
55static void nft_queue_sreg_eval(const struct nft_expr *expr,
56 struct nft_regs *regs,
57 const struct nft_pktinfo *pkt)
58{
59 struct nft_queue *priv = nft_expr_priv(expr);
60 u32 queue, ret;
61
62 queue = regs->data[priv->sreg_qnum];
63
64 ret = NF_QUEUE_NR(queue);
65 if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
66 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
67
68 regs->verdict.code = ret;
69}
70
71static int nft_queue_validate(const struct nft_ctx *ctx,
72 const struct nft_expr *expr)
73{
74 static const unsigned int supported_hooks = ((1 << NF_INET_PRE_ROUTING) |
75 (1 << NF_INET_LOCAL_IN) |
76 (1 << NF_INET_FORWARD) |
77 (1 << NF_INET_LOCAL_OUT) |
78 (1 << NF_INET_POST_ROUTING));
79
80 switch (ctx->family) {
81 case NFPROTO_IPV4:
82 case NFPROTO_IPV6:
83 case NFPROTO_INET:
84 case NFPROTO_BRIDGE:
85 break;
86 case NFPROTO_NETDEV: /* lacks okfn */
87 fallthrough;
88 default:
89 return -EOPNOTSUPP;
90 }
91
92 return nft_chain_validate_hooks(ctx->chain, supported_hooks);
93}
94
95static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
96 [NFTA_QUEUE_NUM] = { .type = NLA_U16 },
97 [NFTA_QUEUE_TOTAL] = { .type = NLA_U16 },
98 [NFTA_QUEUE_FLAGS] = NLA_POLICY_MASK(NLA_BE16, NFT_QUEUE_FLAG_MASK),
99 [NFTA_QUEUE_SREG_QNUM] = { .type = NLA_U32 },
100};
101
102static int nft_queue_init(const struct nft_ctx *ctx,
103 const struct nft_expr *expr,
104 const struct nlattr * const tb[])
105{
106 struct nft_queue *priv = nft_expr_priv(expr);
107 u32 maxid;
108
109 priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
110
111 if (tb[NFTA_QUEUE_TOTAL])
112 priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL]));
113 else
114 priv->queues_total = 1;
115
116 if (priv->queues_total == 0)
117 return -EINVAL;
118
119 maxid = priv->queues_total - 1 + priv->queuenum;
120 if (maxid > U16_MAX)
121 return -ERANGE;
122
123 if (tb[NFTA_QUEUE_FLAGS]) {
124 priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
125 if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
126 return -EINVAL;
127 }
128 return 0;
129}
130
131static int nft_queue_sreg_init(const struct nft_ctx *ctx,
132 const struct nft_expr *expr,
133 const struct nlattr * const tb[])
134{
135 struct nft_queue *priv = nft_expr_priv(expr);
136 int err;
137
138 err = nft_parse_register_load(ctx, tb[NFTA_QUEUE_SREG_QNUM],
139 &priv->sreg_qnum, sizeof(u32));
140 if (err < 0)
141 return err;
142
143 if (tb[NFTA_QUEUE_FLAGS]) {
144 priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
145 if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
146 return -EINVAL;
147 if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT)
148 return -EOPNOTSUPP;
149 }
150
151 return 0;
152}
153
154static int nft_queue_dump(struct sk_buff *skb,
155 const struct nft_expr *expr, bool reset)
156{
157 const struct nft_queue *priv = nft_expr_priv(expr);
158
159 if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) ||
160 nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) ||
161 nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
162 goto nla_put_failure;
163
164 return 0;
165
166nla_put_failure:
167 return -1;
168}
169
170static int
171nft_queue_sreg_dump(struct sk_buff *skb,
172 const struct nft_expr *expr, bool reset)
173{
174 const struct nft_queue *priv = nft_expr_priv(expr);
175
176 if (nft_dump_register(skb, NFTA_QUEUE_SREG_QNUM, priv->sreg_qnum) ||
177 nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
178 goto nla_put_failure;
179
180 return 0;
181
182nla_put_failure:
183 return -1;
184}
185
186static struct nft_expr_type nft_queue_type;
187static const struct nft_expr_ops nft_queue_ops = {
188 .type = &nft_queue_type,
189 .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
190 .eval = nft_queue_eval,
191 .init = nft_queue_init,
192 .dump = nft_queue_dump,
193 .validate = nft_queue_validate,
194};
195
196static const struct nft_expr_ops nft_queue_sreg_ops = {
197 .type = &nft_queue_type,
198 .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
199 .eval = nft_queue_sreg_eval,
200 .init = nft_queue_sreg_init,
201 .dump = nft_queue_sreg_dump,
202 .validate = nft_queue_validate,
203};
204
205static const struct nft_expr_ops *
206nft_queue_select_ops(const struct nft_ctx *ctx,
207 const struct nlattr * const tb[])
208{
209 if (tb[NFTA_QUEUE_NUM] && tb[NFTA_QUEUE_SREG_QNUM])
210 return ERR_PTR(-EINVAL);
211
212 init_hashrandom(&jhash_initval);
213
214 if (tb[NFTA_QUEUE_NUM])
215 return &nft_queue_ops;
216
217 if (tb[NFTA_QUEUE_SREG_QNUM])
218 return &nft_queue_sreg_ops;
219
220 return ERR_PTR(-EINVAL);
221}
222
223static struct nft_expr_type nft_queue_type __read_mostly = {
224 .name = "queue",
225 .select_ops = nft_queue_select_ops,
226 .policy = nft_queue_policy,
227 .maxattr = NFTA_QUEUE_MAX,
228 .owner = THIS_MODULE,
229};
230
231static int __init nft_queue_module_init(void)
232{
233 return nft_register_expr(&nft_queue_type);
234}
235
236static void __exit nft_queue_module_exit(void)
237{
238 nft_unregister_expr(&nft_queue_type);
239}
240
241module_init(nft_queue_module_init);
242module_exit(nft_queue_module_exit);
243
244MODULE_LICENSE("GPL");
245MODULE_AUTHOR("Eric Leblond <[email protected]>");
246MODULE_ALIAS_NFT_EXPR("queue");
247MODULE_DESCRIPTION("Netfilter nftables queue module");