powerpc/powernv: Report size of OPAL memcons log
[linux/fpc-iii.git] / net / netfilter / nft_queue.c
blobdbb6aaff67ec5c151f8c8c6333721421f8e85076
1 /*
2 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
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.
8 * Development of this code partly funded by OISF
9 * (http://www.openinfosecfoundation.org/)
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>
22 static u32 jhash_initval __read_mostly;
24 struct nft_queue {
25 enum nft_registers sreg_qnum:8;
26 u16 queuenum;
27 u16 queues_total;
28 u16 flags;
31 static void nft_queue_eval(const struct nft_expr *expr,
32 struct nft_regs *regs,
33 const struct nft_pktinfo *pkt)
35 struct nft_queue *priv = nft_expr_priv(expr);
36 u32 queue = priv->queuenum;
37 u32 ret;
39 if (priv->queues_total > 1) {
40 if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
41 int cpu = raw_smp_processor_id();
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);
51 ret = NF_QUEUE_NR(queue);
52 if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
53 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
55 regs->verdict.code = ret;
58 static void nft_queue_sreg_eval(const struct nft_expr *expr,
59 struct nft_regs *regs,
60 const struct nft_pktinfo *pkt)
62 struct nft_queue *priv = nft_expr_priv(expr);
63 u32 queue, ret;
65 queue = regs->data[priv->sreg_qnum];
67 ret = NF_QUEUE_NR(queue);
68 if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
69 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
71 regs->verdict.code = ret;
74 static 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 },
81 static int nft_queue_init(const struct nft_ctx *ctx,
82 const struct nft_expr *expr,
83 const struct nlattr * const tb[])
85 struct nft_queue *priv = nft_expr_priv(expr);
86 u32 maxid;
88 priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
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;
95 if (priv->queues_total == 0)
96 return -EINVAL;
98 maxid = priv->queues_total - 1 + priv->queuenum;
99 if (maxid > U16_MAX)
100 return -ERANGE;
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;
107 return 0;
110 static int nft_queue_sreg_init(const struct nft_ctx *ctx,
111 const struct nft_expr *expr,
112 const struct nlattr * const tb[])
114 struct nft_queue *priv = nft_expr_priv(expr);
115 int err;
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;
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;
130 return 0;
133 static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr)
135 const struct nft_queue *priv = nft_expr_priv(expr);
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;
142 return 0;
144 nla_put_failure:
145 return -1;
148 static int
149 nft_queue_sreg_dump(struct sk_buff *skb, const struct nft_expr *expr)
151 const struct nft_queue *priv = nft_expr_priv(expr);
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;
157 return 0;
159 nla_put_failure:
160 return -1;
163 static struct nft_expr_type nft_queue_type;
164 static 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,
172 static 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,
180 static const struct nft_expr_ops *
181 nft_queue_select_ops(const struct nft_ctx *ctx,
182 const struct nlattr * const tb[])
184 if (tb[NFTA_QUEUE_NUM] && tb[NFTA_QUEUE_SREG_QNUM])
185 return ERR_PTR(-EINVAL);
187 init_hashrandom(&jhash_initval);
189 if (tb[NFTA_QUEUE_NUM])
190 return &nft_queue_ops;
192 if (tb[NFTA_QUEUE_SREG_QNUM])
193 return &nft_queue_sreg_ops;
195 return ERR_PTR(-EINVAL);
198 static 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,
206 static int __init nft_queue_module_init(void)
208 return nft_register_expr(&nft_queue_type);
211 static void __exit nft_queue_module_exit(void)
213 nft_unregister_expr(&nft_queue_type);
216 module_init(nft_queue_module_init);
217 module_exit(nft_queue_module_exit);
219 MODULE_LICENSE("GPL");
220 MODULE_AUTHOR("Eric Leblond <eric@regit.org>");
221 MODULE_ALIAS_NFT_EXPR("queue");