1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 *
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/u64_stats_sync.h>
12 #include <linux/netlink.h>
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 #include <net/netfilter/nf_tables.h>
16 #include <net/netfilter/nf_tables_core.h>
17 #include <net/netfilter/nf_tables_offload.h>
18
19 struct nft_counter {
20 u64_stats_t bytes;
21 u64_stats_t packets;
22 };
23
24 struct nft_counter_tot {
25 s64 bytes;
26 s64 packets;
27 };
28
29 struct nft_counter_percpu_priv {
30 struct nft_counter __percpu *counter;
31 };
32
33 static DEFINE_PER_CPU(struct u64_stats_sync, nft_counter_sync);
34
nft_counter_do_eval(struct nft_counter_percpu_priv * priv,struct nft_regs * regs,const struct nft_pktinfo * pkt)35 static inline void nft_counter_do_eval(struct nft_counter_percpu_priv *priv,
36 struct nft_regs *regs,
37 const struct nft_pktinfo *pkt)
38 {
39 struct u64_stats_sync *nft_sync;
40 struct nft_counter *this_cpu;
41
42 local_bh_disable();
43 this_cpu = this_cpu_ptr(priv->counter);
44 nft_sync = this_cpu_ptr(&nft_counter_sync);
45
46 u64_stats_update_begin(nft_sync);
47 u64_stats_add(&this_cpu->bytes, pkt->skb->len);
48 u64_stats_inc(&this_cpu->packets);
49 u64_stats_update_end(nft_sync);
50
51 local_bh_enable();
52 }
53
nft_counter_obj_eval(struct nft_object * obj,struct nft_regs * regs,const struct nft_pktinfo * pkt)54 static inline void nft_counter_obj_eval(struct nft_object *obj,
55 struct nft_regs *regs,
56 const struct nft_pktinfo *pkt)
57 {
58 struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
59
60 nft_counter_do_eval(priv, regs, pkt);
61 }
62
nft_counter_do_init(const struct nlattr * const tb[],struct nft_counter_percpu_priv * priv)63 static int nft_counter_do_init(const struct nlattr * const tb[],
64 struct nft_counter_percpu_priv *priv)
65 {
66 struct nft_counter __percpu *cpu_stats;
67 struct nft_counter *this_cpu;
68
69 cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_KERNEL_ACCOUNT);
70 if (cpu_stats == NULL)
71 return -ENOMEM;
72
73 this_cpu = raw_cpu_ptr(cpu_stats);
74 if (tb[NFTA_COUNTER_PACKETS]) {
75 u64_stats_set(&this_cpu->packets,
76 be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])));
77 }
78 if (tb[NFTA_COUNTER_BYTES]) {
79 u64_stats_set(&this_cpu->bytes,
80 be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])));
81 }
82
83 priv->counter = cpu_stats;
84 return 0;
85 }
86
nft_counter_obj_init(const struct nft_ctx * ctx,const struct nlattr * const tb[],struct nft_object * obj)87 static int nft_counter_obj_init(const struct nft_ctx *ctx,
88 const struct nlattr * const tb[],
89 struct nft_object *obj)
90 {
91 struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
92
93 return nft_counter_do_init(tb, priv);
94 }
95
nft_counter_do_destroy(struct nft_counter_percpu_priv * priv)96 static void nft_counter_do_destroy(struct nft_counter_percpu_priv *priv)
97 {
98 free_percpu(priv->counter);
99 }
100
nft_counter_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)101 static void nft_counter_obj_destroy(const struct nft_ctx *ctx,
102 struct nft_object *obj)
103 {
104 struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
105
106 nft_counter_do_destroy(priv);
107 }
108
nft_counter_reset(struct nft_counter_percpu_priv * priv,struct nft_counter_tot * total)109 static void nft_counter_reset(struct nft_counter_percpu_priv *priv,
110 struct nft_counter_tot *total)
111 {
112 struct u64_stats_sync *nft_sync;
113 struct nft_counter *this_cpu;
114
115 local_bh_disable();
116 this_cpu = this_cpu_ptr(priv->counter);
117 nft_sync = this_cpu_ptr(&nft_counter_sync);
118
119 u64_stats_update_begin(nft_sync);
120 u64_stats_add(&this_cpu->packets, -total->packets);
121 u64_stats_add(&this_cpu->bytes, -total->bytes);
122 u64_stats_update_end(nft_sync);
123
124 local_bh_enable();
125 }
126
nft_counter_fetch(struct nft_counter_percpu_priv * priv,struct nft_counter_tot * total)127 static void nft_counter_fetch(struct nft_counter_percpu_priv *priv,
128 struct nft_counter_tot *total)
129 {
130 struct nft_counter *this_cpu;
131 u64 bytes, packets;
132 unsigned int seq;
133 int cpu;
134
135 memset(total, 0, sizeof(*total));
136 for_each_possible_cpu(cpu) {
137 struct u64_stats_sync *nft_sync = per_cpu_ptr(&nft_counter_sync, cpu);
138
139 this_cpu = per_cpu_ptr(priv->counter, cpu);
140 do {
141 seq = u64_stats_fetch_begin(nft_sync);
142 bytes = u64_stats_read(&this_cpu->bytes);
143 packets = u64_stats_read(&this_cpu->packets);
144 } while (u64_stats_fetch_retry(nft_sync, seq));
145
146 total->bytes += bytes;
147 total->packets += packets;
148 }
149 }
150
nft_counter_do_dump(struct sk_buff * skb,struct nft_counter_percpu_priv * priv,bool reset)151 static int nft_counter_do_dump(struct sk_buff *skb,
152 struct nft_counter_percpu_priv *priv,
153 bool reset)
154 {
155 struct nft_counter_tot total;
156
157 nft_counter_fetch(priv, &total);
158
159 if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
160 NFTA_COUNTER_PAD) ||
161 nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets),
162 NFTA_COUNTER_PAD))
163 goto nla_put_failure;
164
165 if (reset)
166 nft_counter_reset(priv, &total);
167
168 return 0;
169
170 nla_put_failure:
171 return -1;
172 }
173
nft_counter_obj_dump(struct sk_buff * skb,struct nft_object * obj,bool reset)174 static int nft_counter_obj_dump(struct sk_buff *skb,
175 struct nft_object *obj, bool reset)
176 {
177 struct nft_counter_percpu_priv *priv = nft_obj_data(obj);
178
179 return nft_counter_do_dump(skb, priv, reset);
180 }
181
182 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
183 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
184 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
185 };
186
187 struct nft_object_type nft_counter_obj_type;
188 static const struct nft_object_ops nft_counter_obj_ops = {
189 .type = &nft_counter_obj_type,
190 .size = sizeof(struct nft_counter_percpu_priv),
191 .eval = nft_counter_obj_eval,
192 .init = nft_counter_obj_init,
193 .destroy = nft_counter_obj_destroy,
194 .dump = nft_counter_obj_dump,
195 };
196
197 struct nft_object_type nft_counter_obj_type __read_mostly = {
198 .type = NFT_OBJECT_COUNTER,
199 .ops = &nft_counter_obj_ops,
200 .maxattr = NFTA_COUNTER_MAX,
201 .policy = nft_counter_policy,
202 .owner = THIS_MODULE,
203 };
204
nft_counter_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)205 void nft_counter_eval(const struct nft_expr *expr, struct nft_regs *regs,
206 const struct nft_pktinfo *pkt)
207 {
208 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
209
210 nft_counter_do_eval(priv, regs, pkt);
211 }
212
nft_counter_dump(struct sk_buff * skb,const struct nft_expr * expr,bool reset)213 static int nft_counter_dump(struct sk_buff *skb,
214 const struct nft_expr *expr, bool reset)
215 {
216 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
217
218 return nft_counter_do_dump(skb, priv, reset);
219 }
220
nft_counter_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])221 static int nft_counter_init(const struct nft_ctx *ctx,
222 const struct nft_expr *expr,
223 const struct nlattr * const tb[])
224 {
225 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
226
227 return nft_counter_do_init(tb, priv);
228 }
229
nft_counter_destroy(const struct nft_ctx * ctx,const struct nft_expr * expr)230 static void nft_counter_destroy(const struct nft_ctx *ctx,
231 const struct nft_expr *expr)
232 {
233 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
234
235 nft_counter_do_destroy(priv);
236 }
237
nft_counter_clone(struct nft_expr * dst,const struct nft_expr * src,gfp_t gfp)238 static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src, gfp_t gfp)
239 {
240 struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
241 struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
242 struct nft_counter __percpu *cpu_stats;
243 struct nft_counter *this_cpu;
244 struct nft_counter_tot total;
245
246 nft_counter_fetch(priv, &total);
247
248 cpu_stats = alloc_percpu_gfp(struct nft_counter, gfp);
249 if (cpu_stats == NULL)
250 return -ENOMEM;
251
252 this_cpu = raw_cpu_ptr(cpu_stats);
253 u64_stats_set(&this_cpu->packets, total.packets);
254 u64_stats_set(&this_cpu->bytes, total.bytes);
255
256 priv_clone->counter = cpu_stats;
257 return 0;
258 }
259
nft_counter_offload(struct nft_offload_ctx * ctx,struct nft_flow_rule * flow,const struct nft_expr * expr)260 static int nft_counter_offload(struct nft_offload_ctx *ctx,
261 struct nft_flow_rule *flow,
262 const struct nft_expr *expr)
263 {
264 /* No specific offload action is needed, but report success. */
265 return 0;
266 }
267
nft_counter_offload_stats(struct nft_expr * expr,const struct flow_stats * stats)268 static void nft_counter_offload_stats(struct nft_expr *expr,
269 const struct flow_stats *stats)
270 {
271 struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
272 struct u64_stats_sync *nft_sync;
273 struct nft_counter *this_cpu;
274
275 local_bh_disable();
276 this_cpu = this_cpu_ptr(priv->counter);
277 nft_sync = this_cpu_ptr(&nft_counter_sync);
278
279 u64_stats_update_begin(nft_sync);
280 u64_stats_add(&this_cpu->packets, stats->pkts);
281 u64_stats_add(&this_cpu->bytes, stats->bytes);
282 u64_stats_update_end(nft_sync);
283 local_bh_enable();
284 }
285
nft_counter_init_seqcount(void)286 void nft_counter_init_seqcount(void)
287 {
288 int cpu;
289
290 for_each_possible_cpu(cpu)
291 u64_stats_init(per_cpu_ptr(&nft_counter_sync, cpu));
292 }
293
294 struct nft_expr_type nft_counter_type;
295 static const struct nft_expr_ops nft_counter_ops = {
296 .type = &nft_counter_type,
297 .size = NFT_EXPR_SIZE(sizeof(struct nft_counter_percpu_priv)),
298 .eval = nft_counter_eval,
299 .init = nft_counter_init,
300 .destroy = nft_counter_destroy,
301 .destroy_clone = nft_counter_destroy,
302 .dump = nft_counter_dump,
303 .clone = nft_counter_clone,
304 .reduce = NFT_REDUCE_READONLY,
305 .offload = nft_counter_offload,
306 .offload_stats = nft_counter_offload_stats,
307 };
308
309 struct nft_expr_type nft_counter_type __read_mostly = {
310 .name = "counter",
311 .ops = &nft_counter_ops,
312 .policy = nft_counter_policy,
313 .maxattr = NFTA_COUNTER_MAX,
314 .flags = NFT_EXPR_STATEFUL,
315 .owner = THIS_MODULE,
316 };
317