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Linux/net/sched/cls_matchall.c

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  1 /*
  2  * net/sched/cls_matchll.c              Match-all classifier
  3  *
  4  * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/init.h>
 14 #include <linux/module.h>
 15 
 16 #include <net/sch_generic.h>
 17 #include <net/pkt_cls.h>
 18 
 19 struct cls_mall_head {
 20         struct tcf_exts exts;
 21         struct tcf_result res;
 22         u32 handle;
 23         u32 flags;
 24         union {
 25                 struct work_struct work;
 26                 struct rcu_head rcu;
 27         };
 28 };
 29 
 30 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 31                          struct tcf_result *res)
 32 {
 33         struct cls_mall_head *head = rcu_dereference_bh(tp->root);
 34 
 35         if (tc_skip_sw(head->flags))
 36                 return -1;
 37 
 38         *res = head->res;
 39         return tcf_exts_exec(skb, &head->exts, res);
 40 }
 41 
 42 static int mall_init(struct tcf_proto *tp)
 43 {
 44         return 0;
 45 }
 46 
 47 static void __mall_destroy(struct cls_mall_head *head)
 48 {
 49         tcf_exts_destroy(&head->exts);
 50         tcf_exts_put_net(&head->exts);
 51         kfree(head);
 52 }
 53 
 54 static void mall_destroy_work(struct work_struct *work)
 55 {
 56         struct cls_mall_head *head = container_of(work, struct cls_mall_head,
 57                                                   work);
 58         rtnl_lock();
 59         __mall_destroy(head);
 60         rtnl_unlock();
 61 }
 62 
 63 static void mall_destroy_rcu(struct rcu_head *rcu)
 64 {
 65         struct cls_mall_head *head = container_of(rcu, struct cls_mall_head,
 66                                                   rcu);
 67 
 68         INIT_WORK(&head->work, mall_destroy_work);
 69         tcf_queue_work(&head->work);
 70 }
 71 
 72 static void mall_destroy_hw_filter(struct tcf_proto *tp,
 73                                    struct cls_mall_head *head,
 74                                    unsigned long cookie,
 75                                    struct netlink_ext_ack *extack)
 76 {
 77         struct tc_cls_matchall_offload cls_mall = {};
 78         struct tcf_block *block = tp->chain->block;
 79 
 80         tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
 81         cls_mall.command = TC_CLSMATCHALL_DESTROY;
 82         cls_mall.cookie = cookie;
 83 
 84         tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, &cls_mall, false);
 85         tcf_block_offload_dec(block, &head->flags);
 86 }
 87 
 88 static int mall_replace_hw_filter(struct tcf_proto *tp,
 89                                   struct cls_mall_head *head,
 90                                   unsigned long cookie,
 91                                   struct netlink_ext_ack *extack)
 92 {
 93         struct tc_cls_matchall_offload cls_mall = {};
 94         struct tcf_block *block = tp->chain->block;
 95         bool skip_sw = tc_skip_sw(head->flags);
 96         int err;
 97 
 98         tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
 99         cls_mall.command = TC_CLSMATCHALL_REPLACE;
100         cls_mall.exts = &head->exts;
101         cls_mall.cookie = cookie;
102 
103         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL,
104                                &cls_mall, skip_sw);
105         if (err < 0) {
106                 mall_destroy_hw_filter(tp, head, cookie, NULL);
107                 return err;
108         } else if (err > 0) {
109                 tcf_block_offload_inc(block, &head->flags);
110         }
111 
112         if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
113                 return -EINVAL;
114 
115         return 0;
116 }
117 
118 static void mall_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
119 {
120         struct cls_mall_head *head = rtnl_dereference(tp->root);
121 
122         if (!head)
123                 return;
124 
125         if (!tc_skip_hw(head->flags))
126                 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
127 
128         if (tcf_exts_get_net(&head->exts))
129                 call_rcu(&head->rcu, mall_destroy_rcu);
130         else
131                 __mall_destroy(head);
132 }
133 
134 static void *mall_get(struct tcf_proto *tp, u32 handle)
135 {
136         return NULL;
137 }
138 
139 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
140         [TCA_MATCHALL_UNSPEC]           = { .type = NLA_UNSPEC },
141         [TCA_MATCHALL_CLASSID]          = { .type = NLA_U32 },
142 };
143 
144 static int mall_set_parms(struct net *net, struct tcf_proto *tp,
145                           struct cls_mall_head *head,
146                           unsigned long base, struct nlattr **tb,
147                           struct nlattr *est, bool ovr,
148                           struct netlink_ext_ack *extack)
149 {
150         int err;
151 
152         err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, extack);
153         if (err < 0)
154                 return err;
155 
156         if (tb[TCA_MATCHALL_CLASSID]) {
157                 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
158                 tcf_bind_filter(tp, &head->res, base);
159         }
160         return 0;
161 }
162 
163 static int mall_change(struct net *net, struct sk_buff *in_skb,
164                        struct tcf_proto *tp, unsigned long base,
165                        u32 handle, struct nlattr **tca,
166                        void **arg, bool ovr, struct netlink_ext_ack *extack)
167 {
168         struct cls_mall_head *head = rtnl_dereference(tp->root);
169         struct nlattr *tb[TCA_MATCHALL_MAX + 1];
170         struct cls_mall_head *new;
171         u32 flags = 0;
172         int err;
173 
174         if (!tca[TCA_OPTIONS])
175                 return -EINVAL;
176 
177         if (head)
178                 return -EEXIST;
179 
180         err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS],
181                                mall_policy, NULL);
182         if (err < 0)
183                 return err;
184 
185         if (tb[TCA_MATCHALL_FLAGS]) {
186                 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
187                 if (!tc_flags_valid(flags))
188                         return -EINVAL;
189         }
190 
191         new = kzalloc(sizeof(*new), GFP_KERNEL);
192         if (!new)
193                 return -ENOBUFS;
194 
195         err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0);
196         if (err)
197                 goto err_exts_init;
198 
199         if (!handle)
200                 handle = 1;
201         new->handle = handle;
202         new->flags = flags;
203 
204         err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
205                              extack);
206         if (err)
207                 goto err_set_parms;
208 
209         if (!tc_skip_hw(new->flags)) {
210                 err = mall_replace_hw_filter(tp, new, (unsigned long)new,
211                                              extack);
212                 if (err)
213                         goto err_replace_hw_filter;
214         }
215 
216         if (!tc_in_hw(new->flags))
217                 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
218 
219         *arg = head;
220         rcu_assign_pointer(tp->root, new);
221         return 0;
222 
223 err_replace_hw_filter:
224 err_set_parms:
225         tcf_exts_destroy(&new->exts);
226 err_exts_init:
227         kfree(new);
228         return err;
229 }
230 
231 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
232                        struct netlink_ext_ack *extack)
233 {
234         return -EOPNOTSUPP;
235 }
236 
237 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg)
238 {
239         struct cls_mall_head *head = rtnl_dereference(tp->root);
240 
241         if (arg->count < arg->skip)
242                 goto skip;
243         if (arg->fn(tp, head, arg) < 0)
244                 arg->stop = 1;
245 skip:
246         arg->count++;
247 }
248 
249 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
250                      struct sk_buff *skb, struct tcmsg *t)
251 {
252         struct cls_mall_head *head = fh;
253         struct nlattr *nest;
254 
255         if (!head)
256                 return skb->len;
257 
258         t->tcm_handle = head->handle;
259 
260         nest = nla_nest_start(skb, TCA_OPTIONS);
261         if (!nest)
262                 goto nla_put_failure;
263 
264         if (head->res.classid &&
265             nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
266                 goto nla_put_failure;
267 
268         if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
269                 goto nla_put_failure;
270 
271         if (tcf_exts_dump(skb, &head->exts))
272                 goto nla_put_failure;
273 
274         nla_nest_end(skb, nest);
275 
276         if (tcf_exts_dump_stats(skb, &head->exts) < 0)
277                 goto nla_put_failure;
278 
279         return skb->len;
280 
281 nla_put_failure:
282         nla_nest_cancel(skb, nest);
283         return -1;
284 }
285 
286 static void mall_bind_class(void *fh, u32 classid, unsigned long cl)
287 {
288         struct cls_mall_head *head = fh;
289 
290         if (head && head->res.classid == classid)
291                 head->res.class = cl;
292 }
293 
294 static struct tcf_proto_ops cls_mall_ops __read_mostly = {
295         .kind           = "matchall",
296         .classify       = mall_classify,
297         .init           = mall_init,
298         .destroy        = mall_destroy,
299         .get            = mall_get,
300         .change         = mall_change,
301         .delete         = mall_delete,
302         .walk           = mall_walk,
303         .dump           = mall_dump,
304         .bind_class     = mall_bind_class,
305         .owner          = THIS_MODULE,
306 };
307 
308 static int __init cls_mall_init(void)
309 {
310         return register_tcf_proto_ops(&cls_mall_ops);
311 }
312 
313 static void __exit cls_mall_exit(void)
314 {
315         unregister_tcf_proto_ops(&cls_mall_ops);
316 }
317 
318 module_init(cls_mall_init);
319 module_exit(cls_mall_exit);
320 
321 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
322 MODULE_DESCRIPTION("Match-all classifier");
323 MODULE_LICENSE("GPL v2");
324 

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