Commit | Line | Data |
---|---|---|
bf3994d2 JP |
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 | ||
fd62d9f5 | 19 | struct cls_mall_head { |
bf3994d2 JP |
20 | struct tcf_exts exts; |
21 | struct tcf_result res; | |
22 | u32 handle; | |
b87f7936 | 23 | u32 flags; |
bf3994d2 JP |
24 | struct rcu_head rcu; |
25 | }; | |
26 | ||
27 | static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
28 | struct tcf_result *res) | |
29 | { | |
30 | struct cls_mall_head *head = rcu_dereference_bh(tp->root); | |
bf3994d2 | 31 | |
fd62d9f5 | 32 | if (tc_skip_sw(head->flags)) |
b87f7936 YG |
33 | return -1; |
34 | ||
fd62d9f5 | 35 | return tcf_exts_exec(skb, &head->exts, res); |
bf3994d2 JP |
36 | } |
37 | ||
38 | static int mall_init(struct tcf_proto *tp) | |
39 | { | |
bf3994d2 JP |
40 | return 0; |
41 | } | |
42 | ||
fd62d9f5 | 43 | static void mall_destroy_rcu(struct rcu_head *rcu) |
bf3994d2 | 44 | { |
fd62d9f5 YG |
45 | struct cls_mall_head *head = container_of(rcu, struct cls_mall_head, |
46 | rcu); | |
bf3994d2 | 47 | |
fd62d9f5 YG |
48 | tcf_exts_destroy(&head->exts); |
49 | kfree(head); | |
bf3994d2 JP |
50 | } |
51 | ||
b87f7936 | 52 | static int mall_replace_hw_filter(struct tcf_proto *tp, |
fd62d9f5 | 53 | struct cls_mall_head *head, |
b87f7936 YG |
54 | unsigned long cookie) |
55 | { | |
56 | struct net_device *dev = tp->q->dev_queue->dev; | |
57 | struct tc_to_netdev offload; | |
58 | struct tc_cls_matchall_offload mall_offload = {0}; | |
c7d2b2f5 | 59 | int err; |
b87f7936 YG |
60 | |
61 | offload.type = TC_SETUP_MATCHALL; | |
62 | offload.cls_mall = &mall_offload; | |
63 | offload.cls_mall->command = TC_CLSMATCHALL_REPLACE; | |
fd62d9f5 | 64 | offload.cls_mall->exts = &head->exts; |
b87f7936 YG |
65 | offload.cls_mall->cookie = cookie; |
66 | ||
a5fcf8a6 JP |
67 | err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, |
68 | tp->chain->index, | |
69 | tp->protocol, &offload); | |
c7d2b2f5 OG |
70 | if (!err) |
71 | head->flags |= TCA_CLS_FLAGS_IN_HW; | |
72 | ||
73 | return err; | |
b87f7936 YG |
74 | } |
75 | ||
76 | static void mall_destroy_hw_filter(struct tcf_proto *tp, | |
fd62d9f5 | 77 | struct cls_mall_head *head, |
b87f7936 YG |
78 | unsigned long cookie) |
79 | { | |
80 | struct net_device *dev = tp->q->dev_queue->dev; | |
81 | struct tc_to_netdev offload; | |
82 | struct tc_cls_matchall_offload mall_offload = {0}; | |
83 | ||
84 | offload.type = TC_SETUP_MATCHALL; | |
85 | offload.cls_mall = &mall_offload; | |
86 | offload.cls_mall->command = TC_CLSMATCHALL_DESTROY; | |
87 | offload.cls_mall->exts = NULL; | |
88 | offload.cls_mall->cookie = cookie; | |
89 | ||
a5fcf8a6 JP |
90 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->chain->index, |
91 | tp->protocol, &offload); | |
b87f7936 YG |
92 | } |
93 | ||
763dbf63 | 94 | static void mall_destroy(struct tcf_proto *tp) |
bf3994d2 JP |
95 | { |
96 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
b87f7936 | 97 | struct net_device *dev = tp->q->dev_queue->dev; |
bf3994d2 | 98 | |
fd62d9f5 | 99 | if (!head) |
763dbf63 | 100 | return; |
bf3994d2 | 101 | |
fd62d9f5 YG |
102 | if (tc_should_offload(dev, tp, head->flags)) |
103 | mall_destroy_hw_filter(tp, head, (unsigned long) head); | |
b87f7936 | 104 | |
fd62d9f5 | 105 | call_rcu(&head->rcu, mall_destroy_rcu); |
bf3994d2 JP |
106 | } |
107 | ||
108 | static unsigned long mall_get(struct tcf_proto *tp, u32 handle) | |
109 | { | |
fd62d9f5 | 110 | return 0UL; |
bf3994d2 JP |
111 | } |
112 | ||
113 | static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { | |
114 | [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, | |
115 | [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, | |
116 | }; | |
117 | ||
118 | static int mall_set_parms(struct net *net, struct tcf_proto *tp, | |
fd62d9f5 | 119 | struct cls_mall_head *head, |
bf3994d2 JP |
120 | unsigned long base, struct nlattr **tb, |
121 | struct nlattr *est, bool ovr) | |
122 | { | |
123 | struct tcf_exts e; | |
124 | int err; | |
125 | ||
ec2507d2 YG |
126 | err = tcf_exts_init(&e, TCA_MATCHALL_ACT, 0); |
127 | if (err) | |
128 | return err; | |
bf3994d2 JP |
129 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
130 | if (err < 0) | |
ec2507d2 | 131 | goto errout; |
bf3994d2 JP |
132 | |
133 | if (tb[TCA_MATCHALL_CLASSID]) { | |
fd62d9f5 YG |
134 | head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); |
135 | tcf_bind_filter(tp, &head->res, base); | |
bf3994d2 JP |
136 | } |
137 | ||
fd62d9f5 | 138 | tcf_exts_change(tp, &head->exts, &e); |
bf3994d2 JP |
139 | |
140 | return 0; | |
ec2507d2 YG |
141 | errout: |
142 | tcf_exts_destroy(&e); | |
143 | return err; | |
bf3994d2 JP |
144 | } |
145 | ||
146 | static int mall_change(struct net *net, struct sk_buff *in_skb, | |
147 | struct tcf_proto *tp, unsigned long base, | |
148 | u32 handle, struct nlattr **tca, | |
149 | unsigned long *arg, bool ovr) | |
150 | { | |
151 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
b87f7936 | 152 | struct net_device *dev = tp->q->dev_queue->dev; |
bf3994d2 | 153 | struct nlattr *tb[TCA_MATCHALL_MAX + 1]; |
fd62d9f5 | 154 | struct cls_mall_head *new; |
b87f7936 | 155 | u32 flags = 0; |
bf3994d2 JP |
156 | int err; |
157 | ||
158 | if (!tca[TCA_OPTIONS]) | |
159 | return -EINVAL; | |
160 | ||
fd62d9f5 YG |
161 | if (head) |
162 | return -EEXIST; | |
bf3994d2 | 163 | |
fceb6435 JB |
164 | err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], |
165 | mall_policy, NULL); | |
bf3994d2 JP |
166 | if (err < 0) |
167 | return err; | |
168 | ||
b87f7936 YG |
169 | if (tb[TCA_MATCHALL_FLAGS]) { |
170 | flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); | |
171 | if (!tc_flags_valid(flags)) | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
fd62d9f5 YG |
175 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
176 | if (!new) | |
bf3994d2 JP |
177 | return -ENOBUFS; |
178 | ||
e2160156 | 179 | err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); |
ec2507d2 YG |
180 | if (err) |
181 | goto err_exts_init; | |
bf3994d2 JP |
182 | |
183 | if (!handle) | |
184 | handle = 1; | |
fd62d9f5 YG |
185 | new->handle = handle; |
186 | new->flags = flags; | |
bf3994d2 | 187 | |
fd62d9f5 | 188 | err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); |
bf3994d2 | 189 | if (err) |
ec2507d2 | 190 | goto err_set_parms; |
bf3994d2 | 191 | |
b87f7936 | 192 | if (tc_should_offload(dev, tp, flags)) { |
fd62d9f5 | 193 | err = mall_replace_hw_filter(tp, new, (unsigned long) new); |
b87f7936 YG |
194 | if (err) { |
195 | if (tc_skip_sw(flags)) | |
ec2507d2 | 196 | goto err_replace_hw_filter; |
b87f7936 YG |
197 | else |
198 | err = 0; | |
199 | } | |
200 | } | |
c7d2b2f5 OG |
201 | |
202 | if (!tc_in_hw(new->flags)) | |
203 | new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
b87f7936 | 204 | |
fd62d9f5 YG |
205 | *arg = (unsigned long) head; |
206 | rcu_assign_pointer(tp->root, new); | |
bf3994d2 JP |
207 | return 0; |
208 | ||
ec2507d2 YG |
209 | err_replace_hw_filter: |
210 | err_set_parms: | |
e2160156 | 211 | tcf_exts_destroy(&new->exts); |
ec2507d2 | 212 | err_exts_init: |
fd62d9f5 | 213 | kfree(new); |
bf3994d2 JP |
214 | return err; |
215 | } | |
216 | ||
763dbf63 | 217 | static int mall_delete(struct tcf_proto *tp, unsigned long arg, bool *last) |
bf3994d2 | 218 | { |
fd62d9f5 | 219 | return -EOPNOTSUPP; |
bf3994d2 JP |
220 | } |
221 | ||
222 | static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
223 | { | |
224 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
bf3994d2 JP |
225 | |
226 | if (arg->count < arg->skip) | |
227 | goto skip; | |
fd62d9f5 | 228 | if (arg->fn(tp, (unsigned long) head, arg) < 0) |
bf3994d2 JP |
229 | arg->stop = 1; |
230 | skip: | |
231 | arg->count++; | |
232 | } | |
233 | ||
234 | static int mall_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, | |
235 | struct sk_buff *skb, struct tcmsg *t) | |
236 | { | |
fd62d9f5 | 237 | struct cls_mall_head *head = (struct cls_mall_head *) fh; |
bf3994d2 JP |
238 | struct nlattr *nest; |
239 | ||
fd62d9f5 | 240 | if (!head) |
bf3994d2 JP |
241 | return skb->len; |
242 | ||
fd62d9f5 | 243 | t->tcm_handle = head->handle; |
bf3994d2 JP |
244 | |
245 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
246 | if (!nest) | |
247 | goto nla_put_failure; | |
248 | ||
fd62d9f5 YG |
249 | if (head->res.classid && |
250 | nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) | |
bf3994d2 JP |
251 | goto nla_put_failure; |
252 | ||
7a335ada OG |
253 | if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) |
254 | goto nla_put_failure; | |
255 | ||
fd62d9f5 | 256 | if (tcf_exts_dump(skb, &head->exts)) |
bf3994d2 JP |
257 | goto nla_put_failure; |
258 | ||
259 | nla_nest_end(skb, nest); | |
260 | ||
fd62d9f5 | 261 | if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
bf3994d2 JP |
262 | goto nla_put_failure; |
263 | ||
264 | return skb->len; | |
265 | ||
266 | nla_put_failure: | |
267 | nla_nest_cancel(skb, nest); | |
268 | return -1; | |
269 | } | |
270 | ||
271 | static struct tcf_proto_ops cls_mall_ops __read_mostly = { | |
272 | .kind = "matchall", | |
273 | .classify = mall_classify, | |
274 | .init = mall_init, | |
275 | .destroy = mall_destroy, | |
276 | .get = mall_get, | |
277 | .change = mall_change, | |
278 | .delete = mall_delete, | |
279 | .walk = mall_walk, | |
280 | .dump = mall_dump, | |
281 | .owner = THIS_MODULE, | |
282 | }; | |
283 | ||
284 | static int __init cls_mall_init(void) | |
285 | { | |
286 | return register_tcf_proto_ops(&cls_mall_ops); | |
287 | } | |
288 | ||
289 | static void __exit cls_mall_exit(void) | |
290 | { | |
291 | unregister_tcf_proto_ops(&cls_mall_ops); | |
292 | } | |
293 | ||
294 | module_init(cls_mall_init); | |
295 | module_exit(cls_mall_exit); | |
296 | ||
297 | MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); | |
298 | MODULE_DESCRIPTION("Match-all classifier"); | |
299 | MODULE_LICENSE("GPL v2"); |