1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
5 * Development of this code partly funded by OISF
6 * (http://www.openinfosecfoundation.org/)
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>
19 static u32 jhash_initval __read_mostly;
28 static void nft_queue_eval(const struct nft_expr *expr,
29 struct nft_regs *regs,
30 const struct nft_pktinfo *pkt)
32 struct nft_queue *priv = nft_expr_priv(expr);
33 u32 queue = priv->queuenum;
36 if (priv->queues_total > 1) {
37 if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
38 int cpu = raw_smp_processor_id();
40 queue = priv->queuenum + cpu % priv->queues_total;
42 queue = nfqueue_hash(pkt->skb, queue,
43 priv->queues_total, nft_pf(pkt),
48 ret = NF_QUEUE_NR(queue);
49 if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
50 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
52 regs->verdict.code = ret;
55 static void nft_queue_sreg_eval(const struct nft_expr *expr,
56 struct nft_regs *regs,
57 const struct nft_pktinfo *pkt)
59 struct nft_queue *priv = nft_expr_priv(expr);
62 queue = regs->data[priv->sreg_qnum];
64 ret = NF_QUEUE_NR(queue);
65 if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
66 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
68 regs->verdict.code = ret;
71 static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
72 [NFTA_QUEUE_NUM] = { .type = NLA_U16 },
73 [NFTA_QUEUE_TOTAL] = { .type = NLA_U16 },
74 [NFTA_QUEUE_FLAGS] = { .type = NLA_U16 },
75 [NFTA_QUEUE_SREG_QNUM] = { .type = NLA_U32 },
78 static int nft_queue_init(const struct nft_ctx *ctx,
79 const struct nft_expr *expr,
80 const struct nlattr * const tb[])
82 struct nft_queue *priv = nft_expr_priv(expr);
85 priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
87 if (tb[NFTA_QUEUE_TOTAL])
88 priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL]));
90 priv->queues_total = 1;
92 if (priv->queues_total == 0)
95 maxid = priv->queues_total - 1 + priv->queuenum;
99 if (tb[NFTA_QUEUE_FLAGS]) {
100 priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
101 if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
107 static int nft_queue_sreg_init(const struct nft_ctx *ctx,
108 const struct nft_expr *expr,
109 const struct nlattr * const tb[])
111 struct nft_queue *priv = nft_expr_priv(expr);
114 err = nft_parse_register_load(tb[NFTA_QUEUE_SREG_QNUM],
115 &priv->sreg_qnum, sizeof(u32));
119 if (tb[NFTA_QUEUE_FLAGS]) {
120 priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
121 if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
123 if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT)
130 static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr)
132 const struct nft_queue *priv = nft_expr_priv(expr);
134 if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) ||
135 nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) ||
136 nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
137 goto nla_put_failure;
146 nft_queue_sreg_dump(struct sk_buff *skb, const struct nft_expr *expr)
148 const struct nft_queue *priv = nft_expr_priv(expr);
150 if (nft_dump_register(skb, NFTA_QUEUE_SREG_QNUM, priv->sreg_qnum) ||
151 nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
152 goto nla_put_failure;
160 static struct nft_expr_type nft_queue_type;
161 static const struct nft_expr_ops nft_queue_ops = {
162 .type = &nft_queue_type,
163 .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
164 .eval = nft_queue_eval,
165 .init = nft_queue_init,
166 .dump = nft_queue_dump,
169 static const struct nft_expr_ops nft_queue_sreg_ops = {
170 .type = &nft_queue_type,
171 .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
172 .eval = nft_queue_sreg_eval,
173 .init = nft_queue_sreg_init,
174 .dump = nft_queue_sreg_dump,
177 static const struct nft_expr_ops *
178 nft_queue_select_ops(const struct nft_ctx *ctx,
179 const struct nlattr * const tb[])
181 if (tb[NFTA_QUEUE_NUM] && tb[NFTA_QUEUE_SREG_QNUM])
182 return ERR_PTR(-EINVAL);
184 init_hashrandom(&jhash_initval);
186 if (tb[NFTA_QUEUE_NUM])
187 return &nft_queue_ops;
189 if (tb[NFTA_QUEUE_SREG_QNUM])
190 return &nft_queue_sreg_ops;
192 return ERR_PTR(-EINVAL);
195 static struct nft_expr_type nft_queue_type __read_mostly = {
197 .select_ops = nft_queue_select_ops,
198 .policy = nft_queue_policy,
199 .maxattr = NFTA_QUEUE_MAX,
200 .owner = THIS_MODULE,
203 static int __init nft_queue_module_init(void)
205 return nft_register_expr(&nft_queue_type);
208 static void __exit nft_queue_module_exit(void)
210 nft_unregister_expr(&nft_queue_type);
213 module_init(nft_queue_module_init);
214 module_exit(nft_queue_module_exit);
216 MODULE_LICENSE("GPL");
217 MODULE_AUTHOR("Eric Leblond <eric@regit.org>");
218 MODULE_ALIAS_NFT_EXPR("queue");
219 MODULE_DESCRIPTION("Netfilter nftables queue module");