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Linux/net/netfilter/nft_counter.c

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  1 /*
  2  * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
  3  *
  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.
  7  *
  8  * Development of this code funded by Astaro AG (http://www.astaro.com/)
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/init.h>
 13 #include <linux/module.h>
 14 #include <linux/seqlock.h>
 15 #include <linux/netlink.h>
 16 #include <linux/netfilter.h>
 17 #include <linux/netfilter/nf_tables.h>
 18 #include <net/netfilter/nf_tables.h>
 19 
 20 struct nft_counter {
 21         s64             bytes;
 22         s64             packets;
 23 };
 24 
 25 struct nft_counter_percpu_priv {
 26         struct nft_counter __percpu *counter;
 27 };
 28 
 29 static DEFINE_PER_CPU(seqcount_t, nft_counter_seq);
 30 
 31 static inline void nft_counter_do_eval(struct nft_counter_percpu_priv *priv,
 32                                        struct nft_regs *regs,
 33                                        const struct nft_pktinfo *pkt)
 34 {
 35         struct nft_counter *this_cpu;
 36         seqcount_t *myseq;
 37 
 38         local_bh_disable();
 39         this_cpu = this_cpu_ptr(priv->counter);
 40         myseq = this_cpu_ptr(&nft_counter_seq);
 41 
 42         write_seqcount_begin(myseq);
 43 
 44         this_cpu->bytes += pkt->skb->len;
 45         this_cpu->packets++;
 46 
 47         write_seqcount_end(myseq);
 48         local_bh_enable();
 49 }
 50 
 51 static inline void nft_counter_obj_eval(struct nft_object *obj,
 52                                         struct nft_regs *regs,
 53                                         const struct nft_pktinfo *pkt)
 54 {
 55         struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
 56 
 57         nft_counter_do_eval(priv, regs, pkt);
 58 }
 59 
 60 static int nft_counter_do_init(const struct nlattr * const tb[],
 61                                struct nft_counter_percpu_priv *priv)
 62 {
 63         struct nft_counter __percpu *cpu_stats;
 64         struct nft_counter *this_cpu;
 65 
 66         cpu_stats = alloc_percpu(struct nft_counter);
 67         if (cpu_stats == NULL)
 68                 return -ENOMEM;
 69 
 70         preempt_disable();
 71         this_cpu = this_cpu_ptr(cpu_stats);
 72         if (tb[NFTA_COUNTER_PACKETS]) {
 73                 this_cpu->packets =
 74                         be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
 75         }
 76         if (tb[NFTA_COUNTER_BYTES]) {
 77                 this_cpu->bytes =
 78                         be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
 79         }
 80         preempt_enable();
 81         priv->counter = cpu_stats;
 82         return 0;
 83 }
 84 
 85 static int nft_counter_obj_init(const struct nft_ctx *ctx,
 86                                 const struct nlattr * const tb[],
 87                                 struct nft_object *obj)
 88 {
 89         struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
 90 
 91         return nft_counter_do_init(tb, priv);
 92 }
 93 
 94 static void nft_counter_do_destroy(struct nft_counter_percpu_priv *priv)
 95 {
 96         free_percpu(priv->counter);
 97 }
 98 
 99 static void nft_counter_obj_destroy(struct nft_object *obj)
100 {
101         struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
102 
103         nft_counter_do_destroy(priv);
104 }
105 
106 static void nft_counter_reset(struct nft_counter_percpu_priv __percpu *priv,
107                               struct nft_counter *total)
108 {
109         struct nft_counter *this_cpu;
110 
111         local_bh_disable();
112         this_cpu = this_cpu_ptr(priv->counter);
113         this_cpu->packets -= total->packets;
114         this_cpu->bytes -= total->bytes;
115         local_bh_enable();
116 }
117 
118 static void nft_counter_fetch(struct nft_counter_percpu_priv *priv,
119                               struct nft_counter *total)
120 {
121         struct nft_counter *this_cpu;
122         const seqcount_t *myseq;
123         u64 bytes, packets;
124         unsigned int seq;
125         int cpu;
126 
127         memset(total, 0, sizeof(*total));
128         for_each_possible_cpu(cpu) {
129                 myseq = per_cpu_ptr(&nft_counter_seq, cpu);
130                 this_cpu = per_cpu_ptr(priv->counter, cpu);
131                 do {
132                         seq     = read_seqcount_begin(myseq);
133                         bytes   = this_cpu->bytes;
134                         packets = this_cpu->packets;
135                 } while (read_seqcount_retry(myseq, seq));
136 
137                 total->bytes    += bytes;
138                 total->packets  += packets;
139         }
140 }
141 
142 static int nft_counter_do_dump(struct sk_buff *skb,
143                                struct nft_counter_percpu_priv *priv,
144                                bool reset)
145 {
146         struct nft_counter total;
147 
148         nft_counter_fetch(priv, &total);
149 
150         if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
151                          NFTA_COUNTER_PAD) ||
152             nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets),
153                          NFTA_COUNTER_PAD))
154                 goto nla_put_failure;
155 
156         if (reset)
157                 nft_counter_reset(priv, &total);
158 
159         return 0;
160 
161 nla_put_failure:
162         return -1;
163 }
164 
165 static int nft_counter_obj_dump(struct sk_buff *skb,
166                                 struct nft_object *obj, bool reset)
167 {
168         struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
169 
170         return nft_counter_do_dump(skb, priv, reset);
171 }
172 
173 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
174         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
175         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
176 };
177 
178 static struct nft_object_type nft_counter_obj __read_mostly = {
179         .type           = NFT_OBJECT_COUNTER,
180         .size           = sizeof(struct nft_counter_percpu_priv),
181         .maxattr        = NFTA_COUNTER_MAX,
182         .policy         = nft_counter_policy,
183         .eval           = nft_counter_obj_eval,
184         .init           = nft_counter_obj_init,
185         .destroy        = nft_counter_obj_destroy,
186         .dump           = nft_counter_obj_dump,
187         .owner          = THIS_MODULE,
188 };
189 
190 static void nft_counter_eval(const struct nft_expr *expr,
191                              struct nft_regs *regs,
192                              const struct nft_pktinfo *pkt)
193 {
194         struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
195 
196         nft_counter_do_eval(priv, regs, pkt);
197 }
198 
199 static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
200 {
201         struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
202 
203         return nft_counter_do_dump(skb, priv, false);
204 }
205 
206 static int nft_counter_init(const struct nft_ctx *ctx,
207                             const struct nft_expr *expr,
208                             const struct nlattr * const tb[])
209 {
210         struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
211 
212         return nft_counter_do_init(tb, priv);
213 }
214 
215 static void nft_counter_destroy(const struct nft_ctx *ctx,
216                                 const struct nft_expr *expr)
217 {
218         struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
219 
220         nft_counter_do_destroy(priv);
221 }
222 
223 static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src)
224 {
225         struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
226         struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
227         struct nft_counter __percpu *cpu_stats;
228         struct nft_counter *this_cpu;
229         struct nft_counter total;
230 
231         nft_counter_fetch(priv, &total);
232 
233         cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_ATOMIC);
234         if (cpu_stats == NULL)
235                 return -ENOMEM;
236 
237         preempt_disable();
238         this_cpu = this_cpu_ptr(cpu_stats);
239         this_cpu->packets = total.packets;
240         this_cpu->bytes = total.bytes;
241         preempt_enable();
242 
243         priv_clone->counter = cpu_stats;
244         return 0;
245 }
246 
247 static struct nft_expr_type nft_counter_type;
248 static const struct nft_expr_ops nft_counter_ops = {
249         .type           = &nft_counter_type,
250         .size           = NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)),
251         .eval           = nft_counter_eval,
252         .init           = nft_counter_init,
253         .destroy        = nft_counter_destroy,
254         .dump           = nft_counter_dump,
255         .clone          = nft_counter_clone,
256 };
257 
258 static struct nft_expr_type nft_counter_type __read_mostly = {
259         .name           = "counter",
260         .ops            = &nft_counter_ops,
261         .policy         = nft_counter_policy,
262         .maxattr        = NFTA_COUNTER_MAX,
263         .flags          = NFT_EXPR_STATEFUL,
264         .owner          = THIS_MODULE,
265 };
266 
267 static int __init nft_counter_module_init(void)
268 {
269         int cpu, err;
270 
271         for_each_possible_cpu(cpu)
272                 seqcount_init(per_cpu_ptr(&nft_counter_seq, cpu));
273 
274         err = nft_register_obj(&nft_counter_obj);
275         if (err < 0)
276                 return err;
277 
278         err = nft_register_expr(&nft_counter_type);
279         if (err < 0)
280                 goto err1;
281 
282         return 0;
283 err1:
284         nft_unregister_obj(&nft_counter_obj);
285         return err;
286 }
287 
288 static void __exit nft_counter_module_exit(void)
289 {
290         nft_unregister_expr(&nft_counter_type);
291         nft_unregister_obj(&nft_counter_obj);
292 }
293 
294 module_init(nft_counter_module_init);
295 module_exit(nft_counter_module_exit);
296 
297 MODULE_LICENSE("GPL");
298 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
299 MODULE_ALIAS_NFT_EXPR("counter");
300 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_COUNTER);
301 

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