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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/cls_basic.c Basic Packet Classifier. | |
4 | * | |
1da177e4 LT |
5 | * Authors: Thomas Graf <tgraf@suug.ch> |
6 | */ | |
7 | ||
1da177e4 | 8 | #include <linux/module.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
1da177e4 LT |
10 | #include <linux/types.h> |
11 | #include <linux/kernel.h> | |
1da177e4 | 12 | #include <linux/string.h> |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/rtnetlink.h> | |
15 | #include <linux/skbuff.h> | |
1d8134fe | 16 | #include <linux/idr.h> |
5954894b | 17 | #include <linux/percpu.h> |
dc5fc579 | 18 | #include <net/netlink.h> |
1da177e4 LT |
19 | #include <net/act_api.h> |
20 | #include <net/pkt_cls.h> | |
21 | ||
cc7ec456 | 22 | struct basic_head { |
1da177e4 | 23 | struct list_head flist; |
1d8134fe | 24 | struct idr handle_idr; |
9888faef | 25 | struct rcu_head rcu; |
1da177e4 LT |
26 | }; |
27 | ||
cc7ec456 | 28 | struct basic_filter { |
1da177e4 LT |
29 | u32 handle; |
30 | struct tcf_exts exts; | |
31 | struct tcf_ematch_tree ematches; | |
32 | struct tcf_result res; | |
9888faef | 33 | struct tcf_proto *tp; |
1da177e4 | 34 | struct list_head link; |
5954894b | 35 | struct tc_basic_pcnt __percpu *pf; |
aaa908ff | 36 | struct rcu_work rwork; |
1da177e4 LT |
37 | }; |
38 | ||
dc7f9f6e | 39 | static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
40 | struct tcf_result *res) |
41 | { | |
42 | int r; | |
9888faef | 43 | struct basic_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
44 | struct basic_filter *f; |
45 | ||
9888faef | 46 | list_for_each_entry_rcu(f, &head->flist, link) { |
5954894b | 47 | __this_cpu_inc(f->pf->rcnt); |
1da177e4 LT |
48 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) |
49 | continue; | |
5954894b | 50 | __this_cpu_inc(f->pf->rhit); |
1da177e4 LT |
51 | *res = f->res; |
52 | r = tcf_exts_exec(skb, &f->exts, res); | |
53 | if (r < 0) | |
54 | continue; | |
55 | return r; | |
56 | } | |
57 | return -1; | |
58 | } | |
59 | ||
8113c095 | 60 | static void *basic_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 61 | { |
9888faef | 62 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
63 | struct basic_filter *f; |
64 | ||
1c1bc6bd DB |
65 | list_for_each_entry(f, &head->flist, link) { |
66 | if (f->handle == handle) { | |
8113c095 | 67 | return f; |
1c1bc6bd DB |
68 | } |
69 | } | |
1da177e4 | 70 | |
8113c095 | 71 | return NULL; |
1da177e4 LT |
72 | } |
73 | ||
1da177e4 LT |
74 | static int basic_init(struct tcf_proto *tp) |
75 | { | |
d3fa76ee PM |
76 | struct basic_head *head; |
77 | ||
78 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
79 | if (head == NULL) | |
80 | return -ENOBUFS; | |
81 | INIT_LIST_HEAD(&head->flist); | |
1d8134fe | 82 | idr_init(&head->handle_idr); |
9888faef | 83 | rcu_assign_pointer(tp->root, head); |
1da177e4 LT |
84 | return 0; |
85 | } | |
86 | ||
0b2a5989 CW |
87 | static void __basic_delete_filter(struct basic_filter *f) |
88 | { | |
89 | tcf_exts_destroy(&f->exts); | |
90 | tcf_em_tree_destroy(&f->ematches); | |
91 | tcf_exts_put_net(&f->exts); | |
5954894b | 92 | free_percpu(f->pf); |
0b2a5989 CW |
93 | kfree(f); |
94 | } | |
95 | ||
c96a4838 | 96 | static void basic_delete_filter_work(struct work_struct *work) |
1da177e4 | 97 | { |
aaa908ff CW |
98 | struct basic_filter *f = container_of(to_rcu_work(work), |
99 | struct basic_filter, | |
100 | rwork); | |
c96a4838 | 101 | rtnl_lock(); |
0b2a5989 | 102 | __basic_delete_filter(f); |
c96a4838 | 103 | rtnl_unlock(); |
1da177e4 LT |
104 | } |
105 | ||
12db03b6 VB |
106 | static void basic_destroy(struct tcf_proto *tp, bool rtnl_held, |
107 | struct netlink_ext_ack *extack) | |
1da177e4 | 108 | { |
9888faef | 109 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 | 110 | struct basic_filter *f, *n; |
10297b99 | 111 | |
1da177e4 | 112 | list_for_each_entry_safe(f, n, &head->flist, link) { |
9888faef | 113 | list_del_rcu(&f->link); |
18cdb37e | 114 | tcf_unbind_filter(tp, &f->res); |
9c160941 | 115 | idr_remove(&head->handle_idr, f->handle); |
0b2a5989 | 116 | if (tcf_exts_get_net(&f->exts)) |
aaa908ff | 117 | tcf_queue_work(&f->rwork, basic_delete_filter_work); |
0b2a5989 CW |
118 | else |
119 | __basic_delete_filter(f); | |
1da177e4 | 120 | } |
1d8134fe | 121 | idr_destroy(&head->handle_idr); |
9888faef | 122 | kfree_rcu(head, rcu); |
1da177e4 LT |
123 | } |
124 | ||
571acf21 | 125 | static int basic_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 126 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 127 | { |
763dbf63 | 128 | struct basic_head *head = rtnl_dereference(tp->root); |
8113c095 | 129 | struct basic_filter *f = arg; |
1da177e4 | 130 | |
e4386456 JP |
131 | list_del_rcu(&f->link); |
132 | tcf_unbind_filter(tp, &f->res); | |
9c160941 | 133 | idr_remove(&head->handle_idr, f->handle); |
0b2a5989 | 134 | tcf_exts_get_net(&f->exts); |
aaa908ff | 135 | tcf_queue_work(&f->rwork, basic_delete_filter_work); |
763dbf63 | 136 | *last = list_empty(&head->flist); |
e4386456 | 137 | return 0; |
1da177e4 LT |
138 | } |
139 | ||
6fa8c014 PM |
140 | static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { |
141 | [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, | |
142 | [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, | |
143 | }; | |
144 | ||
c1b52739 BL |
145 | static int basic_set_parms(struct net *net, struct tcf_proto *tp, |
146 | struct basic_filter *f, unsigned long base, | |
147 | struct nlattr **tb, | |
50a56190 AA |
148 | struct nlattr *est, bool ovr, |
149 | struct netlink_ext_ack *extack) | |
1da177e4 | 150 | { |
6459082a | 151 | int err; |
1da177e4 | 152 | |
ec6743a1 | 153 | err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, true, extack); |
1da177e4 LT |
154 | if (err < 0) |
155 | return err; | |
156 | ||
4ebc1e3c | 157 | err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches); |
1da177e4 | 158 | if (err < 0) |
ff1f8ca0 | 159 | return err; |
1da177e4 | 160 | |
add93b61 | 161 | if (tb[TCA_BASIC_CLASSID]) { |
1587bac4 | 162 | f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); |
1da177e4 LT |
163 | tcf_bind_filter(tp, &f->res, base); |
164 | } | |
165 | ||
9888faef | 166 | f->tp = tp; |
1da177e4 | 167 | return 0; |
1da177e4 LT |
168 | } |
169 | ||
c1b52739 | 170 | static int basic_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 171 | struct tcf_proto *tp, unsigned long base, u32 handle, |
7306db38 | 172 | struct nlattr **tca, void **arg, bool ovr, |
12db03b6 | 173 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 174 | { |
cee63723 | 175 | int err; |
9888faef | 176 | struct basic_head *head = rtnl_dereference(tp->root); |
add93b61 | 177 | struct nlattr *tb[TCA_BASIC_MAX + 1]; |
9888faef JF |
178 | struct basic_filter *fold = (struct basic_filter *) *arg; |
179 | struct basic_filter *fnew; | |
1da177e4 | 180 | |
add93b61 | 181 | if (tca[TCA_OPTIONS] == NULL) |
1da177e4 LT |
182 | return -EINVAL; |
183 | ||
8cb08174 JB |
184 | err = nla_parse_nested_deprecated(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], |
185 | basic_policy, NULL); | |
cee63723 PM |
186 | if (err < 0) |
187 | return err; | |
1da177e4 | 188 | |
9888faef JF |
189 | if (fold != NULL) { |
190 | if (handle && fold->handle != handle) | |
1da177e4 | 191 | return -EINVAL; |
1da177e4 LT |
192 | } |
193 | ||
9888faef | 194 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
bd42b788 JP |
195 | if (!fnew) |
196 | return -ENOBUFS; | |
1da177e4 | 197 | |
14215108 | 198 | err = tcf_exts_init(&fnew->exts, net, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
b9a24bb7 WC |
199 | if (err < 0) |
200 | goto errout; | |
201 | ||
05af0ebb MW |
202 | if (!handle) { |
203 | handle = 1; | |
204 | err = idr_alloc_u32(&head->handle_idr, fnew, &handle, | |
205 | INT_MAX, GFP_KERNEL); | |
206 | } else if (!fold) { | |
207 | err = idr_alloc_u32(&head->handle_idr, fnew, &handle, | |
208 | handle, GFP_KERNEL); | |
1da177e4 | 209 | } |
05af0ebb MW |
210 | if (err) |
211 | goto errout; | |
212 | fnew->handle = handle; | |
5954894b CW |
213 | fnew->pf = alloc_percpu(struct tc_basic_pcnt); |
214 | if (!fnew->pf) { | |
215 | err = -ENOMEM; | |
216 | goto errout; | |
217 | } | |
1da177e4 | 218 | |
50a56190 AA |
219 | err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr, |
220 | extack); | |
1d8134fe CW |
221 | if (err < 0) { |
222 | if (!fold) | |
9c160941 | 223 | idr_remove(&head->handle_idr, fnew->handle); |
1da177e4 | 224 | goto errout; |
1d8134fe | 225 | } |
1da177e4 | 226 | |
8113c095 | 227 | *arg = fnew; |
9888faef JF |
228 | |
229 | if (fold) { | |
234a4624 | 230 | idr_replace(&head->handle_idr, fnew, fnew->handle); |
9888faef | 231 | list_replace_rcu(&fold->link, &fnew->link); |
18cdb37e | 232 | tcf_unbind_filter(tp, &fold->res); |
0b2a5989 | 233 | tcf_exts_get_net(&fold->exts); |
aaa908ff | 234 | tcf_queue_work(&fold->rwork, basic_delete_filter_work); |
9888faef JF |
235 | } else { |
236 | list_add_rcu(&fnew->link, &head->flist); | |
237 | } | |
1da177e4 LT |
238 | |
239 | return 0; | |
240 | errout: | |
5954894b | 241 | free_percpu(fnew->pf); |
b9a24bb7 | 242 | tcf_exts_destroy(&fnew->exts); |
9888faef | 243 | kfree(fnew); |
1da177e4 LT |
244 | return err; |
245 | } | |
246 | ||
12db03b6 VB |
247 | static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
248 | bool rtnl_held) | |
1da177e4 | 249 | { |
9888faef | 250 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
251 | struct basic_filter *f; |
252 | ||
253 | list_for_each_entry(f, &head->flist, link) { | |
254 | if (arg->count < arg->skip) | |
255 | goto skip; | |
256 | ||
8113c095 | 257 | if (arg->fn(tp, f, arg) < 0) { |
1da177e4 LT |
258 | arg->stop = 1; |
259 | break; | |
260 | } | |
261 | skip: | |
262 | arg->count++; | |
263 | } | |
264 | } | |
265 | ||
07d79fc7 CW |
266 | static void basic_bind_class(void *fh, u32 classid, unsigned long cl) |
267 | { | |
268 | struct basic_filter *f = fh; | |
269 | ||
270 | if (f && f->res.classid == classid) | |
271 | f->res.class = cl; | |
272 | } | |
273 | ||
8113c095 | 274 | static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 275 | struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
1da177e4 | 276 | { |
5954894b | 277 | struct tc_basic_pcnt gpf = {}; |
8113c095 | 278 | struct basic_filter *f = fh; |
4b3550ef | 279 | struct nlattr *nest; |
5954894b | 280 | int cpu; |
1da177e4 LT |
281 | |
282 | if (f == NULL) | |
283 | return skb->len; | |
284 | ||
285 | t->tcm_handle = f->handle; | |
286 | ||
ae0be8de | 287 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
4b3550ef PM |
288 | if (nest == NULL) |
289 | goto nla_put_failure; | |
1da177e4 | 290 | |
1b34ec43 DM |
291 | if (f->res.classid && |
292 | nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid)) | |
293 | goto nla_put_failure; | |
e1e284a4 | 294 | |
5954894b CW |
295 | for_each_possible_cpu(cpu) { |
296 | struct tc_basic_pcnt *pf = per_cpu_ptr(f->pf, cpu); | |
297 | ||
298 | gpf.rcnt += pf->rcnt; | |
299 | gpf.rhit += pf->rhit; | |
300 | } | |
301 | ||
302 | if (nla_put_64bit(skb, TCA_BASIC_PCNT, | |
303 | sizeof(struct tc_basic_pcnt), | |
304 | &gpf, TCA_BASIC_PAD)) | |
305 | goto nla_put_failure; | |
306 | ||
5da57f42 | 307 | if (tcf_exts_dump(skb, &f->exts) < 0 || |
1da177e4 | 308 | tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0) |
add93b61 | 309 | goto nla_put_failure; |
1da177e4 | 310 | |
4b3550ef | 311 | nla_nest_end(skb, nest); |
4c46ee52 | 312 | |
5da57f42 | 313 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
4c46ee52 | 314 | goto nla_put_failure; |
315 | ||
1da177e4 LT |
316 | return skb->len; |
317 | ||
add93b61 | 318 | nla_put_failure: |
4b3550ef | 319 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
320 | return -1; |
321 | } | |
322 | ||
2eb9d75c | 323 | static struct tcf_proto_ops cls_basic_ops __read_mostly = { |
1da177e4 LT |
324 | .kind = "basic", |
325 | .classify = basic_classify, | |
326 | .init = basic_init, | |
327 | .destroy = basic_destroy, | |
328 | .get = basic_get, | |
1da177e4 LT |
329 | .change = basic_change, |
330 | .delete = basic_delete, | |
331 | .walk = basic_walk, | |
332 | .dump = basic_dump, | |
07d79fc7 | 333 | .bind_class = basic_bind_class, |
1da177e4 LT |
334 | .owner = THIS_MODULE, |
335 | }; | |
336 | ||
337 | static int __init init_basic(void) | |
338 | { | |
339 | return register_tcf_proto_ops(&cls_basic_ops); | |
340 | } | |
341 | ||
10297b99 | 342 | static void __exit exit_basic(void) |
1da177e4 LT |
343 | { |
344 | unregister_tcf_proto_ops(&cls_basic_ops); | |
345 | } | |
346 | ||
347 | module_init(init_basic) | |
348 | module_exit(exit_basic) | |
349 | MODULE_LICENSE("GPL"); |