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