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Commit | Line | Data |
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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 | ||
3ff4cbec | 35 | *res = head->res; |
fd62d9f5 | 36 | return tcf_exts_exec(skb, &head->exts, res); |
bf3994d2 JP |
37 | } |
38 | ||
39 | static int mall_init(struct tcf_proto *tp) | |
40 | { | |
bf3994d2 JP |
41 | return 0; |
42 | } | |
43 | ||
fd62d9f5 | 44 | static void mall_destroy_rcu(struct rcu_head *rcu) |
bf3994d2 | 45 | { |
fd62d9f5 YG |
46 | struct cls_mall_head *head = container_of(rcu, struct cls_mall_head, |
47 | rcu); | |
bf3994d2 | 48 | |
fd62d9f5 YG |
49 | tcf_exts_destroy(&head->exts); |
50 | kfree(head); | |
bf3994d2 JP |
51 | } |
52 | ||
b87f7936 | 53 | static int mall_replace_hw_filter(struct tcf_proto *tp, |
fd62d9f5 | 54 | struct cls_mall_head *head, |
b87f7936 YG |
55 | unsigned long cookie) |
56 | { | |
57 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 58 | struct tc_cls_matchall_offload cls_mall = {}; |
c7d2b2f5 | 59 | int err; |
b87f7936 | 60 | |
de4784ca JP |
61 | tc_cls_common_offload_init(&cls_mall.common, tp); |
62 | cls_mall.command = TC_CLSMATCHALL_REPLACE; | |
63 | cls_mall.exts = &head->exts; | |
64 | cls_mall.cookie = cookie; | |
b87f7936 | 65 | |
ade9b658 | 66 | err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, |
de4784ca | 67 | &cls_mall); |
c7d2b2f5 OG |
68 | if (!err) |
69 | head->flags |= TCA_CLS_FLAGS_IN_HW; | |
70 | ||
71 | return err; | |
b87f7936 YG |
72 | } |
73 | ||
74 | static void mall_destroy_hw_filter(struct tcf_proto *tp, | |
fd62d9f5 | 75 | struct cls_mall_head *head, |
b87f7936 YG |
76 | unsigned long cookie) |
77 | { | |
78 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 79 | struct tc_cls_matchall_offload cls_mall = {}; |
b87f7936 | 80 | |
de4784ca JP |
81 | tc_cls_common_offload_init(&cls_mall.common, tp); |
82 | cls_mall.command = TC_CLSMATCHALL_DESTROY; | |
83 | cls_mall.cookie = cookie; | |
b87f7936 | 84 | |
de4784ca | 85 | dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, &cls_mall); |
b87f7936 YG |
86 | } |
87 | ||
763dbf63 | 88 | static void mall_destroy(struct tcf_proto *tp) |
bf3994d2 JP |
89 | { |
90 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
b87f7936 | 91 | struct net_device *dev = tp->q->dev_queue->dev; |
bf3994d2 | 92 | |
fd62d9f5 | 93 | if (!head) |
763dbf63 | 94 | return; |
bf3994d2 | 95 | |
7b06e8ae | 96 | if (tc_should_offload(dev, head->flags)) |
fd62d9f5 | 97 | mall_destroy_hw_filter(tp, head, (unsigned long) head); |
b87f7936 | 98 | |
fd62d9f5 | 99 | call_rcu(&head->rcu, mall_destroy_rcu); |
bf3994d2 JP |
100 | } |
101 | ||
8113c095 | 102 | static void *mall_get(struct tcf_proto *tp, u32 handle) |
bf3994d2 | 103 | { |
8113c095 | 104 | return NULL; |
bf3994d2 JP |
105 | } |
106 | ||
107 | static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { | |
108 | [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, | |
109 | [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, | |
110 | }; | |
111 | ||
112 | static int mall_set_parms(struct net *net, struct tcf_proto *tp, | |
fd62d9f5 | 113 | struct cls_mall_head *head, |
bf3994d2 JP |
114 | unsigned long base, struct nlattr **tb, |
115 | struct nlattr *est, bool ovr) | |
116 | { | |
bf3994d2 JP |
117 | int err; |
118 | ||
a74cb369 | 119 | err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr); |
bf3994d2 | 120 | if (err < 0) |
a74cb369 | 121 | return err; |
bf3994d2 JP |
122 | |
123 | if (tb[TCA_MATCHALL_CLASSID]) { | |
fd62d9f5 YG |
124 | head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); |
125 | tcf_bind_filter(tp, &head->res, base); | |
bf3994d2 | 126 | } |
bf3994d2 JP |
127 | return 0; |
128 | } | |
129 | ||
130 | static int mall_change(struct net *net, struct sk_buff *in_skb, | |
131 | struct tcf_proto *tp, unsigned long base, | |
132 | u32 handle, struct nlattr **tca, | |
8113c095 | 133 | void **arg, bool ovr) |
bf3994d2 JP |
134 | { |
135 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
b87f7936 | 136 | struct net_device *dev = tp->q->dev_queue->dev; |
bf3994d2 | 137 | struct nlattr *tb[TCA_MATCHALL_MAX + 1]; |
fd62d9f5 | 138 | struct cls_mall_head *new; |
b87f7936 | 139 | u32 flags = 0; |
bf3994d2 JP |
140 | int err; |
141 | ||
142 | if (!tca[TCA_OPTIONS]) | |
143 | return -EINVAL; | |
144 | ||
fd62d9f5 YG |
145 | if (head) |
146 | return -EEXIST; | |
bf3994d2 | 147 | |
fceb6435 JB |
148 | err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], |
149 | mall_policy, NULL); | |
bf3994d2 JP |
150 | if (err < 0) |
151 | return err; | |
152 | ||
b87f7936 YG |
153 | if (tb[TCA_MATCHALL_FLAGS]) { |
154 | flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); | |
155 | if (!tc_flags_valid(flags)) | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
fd62d9f5 YG |
159 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
160 | if (!new) | |
bf3994d2 JP |
161 | return -ENOBUFS; |
162 | ||
e2160156 | 163 | err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); |
ec2507d2 YG |
164 | if (err) |
165 | goto err_exts_init; | |
bf3994d2 JP |
166 | |
167 | if (!handle) | |
168 | handle = 1; | |
fd62d9f5 YG |
169 | new->handle = handle; |
170 | new->flags = flags; | |
bf3994d2 | 171 | |
fd62d9f5 | 172 | err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); |
bf3994d2 | 173 | if (err) |
ec2507d2 | 174 | goto err_set_parms; |
bf3994d2 | 175 | |
7b06e8ae | 176 | if (tc_should_offload(dev, flags)) { |
fd62d9f5 | 177 | err = mall_replace_hw_filter(tp, new, (unsigned long) new); |
b87f7936 YG |
178 | if (err) { |
179 | if (tc_skip_sw(flags)) | |
ec2507d2 | 180 | goto err_replace_hw_filter; |
b87f7936 YG |
181 | else |
182 | err = 0; | |
183 | } | |
184 | } | |
c7d2b2f5 OG |
185 | |
186 | if (!tc_in_hw(new->flags)) | |
187 | new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
b87f7936 | 188 | |
8113c095 | 189 | *arg = head; |
fd62d9f5 | 190 | rcu_assign_pointer(tp->root, new); |
bf3994d2 JP |
191 | return 0; |
192 | ||
ec2507d2 YG |
193 | err_replace_hw_filter: |
194 | err_set_parms: | |
e2160156 | 195 | tcf_exts_destroy(&new->exts); |
ec2507d2 | 196 | err_exts_init: |
fd62d9f5 | 197 | kfree(new); |
bf3994d2 JP |
198 | return err; |
199 | } | |
200 | ||
8113c095 | 201 | static int mall_delete(struct tcf_proto *tp, void *arg, bool *last) |
bf3994d2 | 202 | { |
fd62d9f5 | 203 | return -EOPNOTSUPP; |
bf3994d2 JP |
204 | } |
205 | ||
206 | static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
207 | { | |
208 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
bf3994d2 JP |
209 | |
210 | if (arg->count < arg->skip) | |
211 | goto skip; | |
8113c095 | 212 | if (arg->fn(tp, head, arg) < 0) |
bf3994d2 JP |
213 | arg->stop = 1; |
214 | skip: | |
215 | arg->count++; | |
216 | } | |
217 | ||
8113c095 | 218 | static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, |
bf3994d2 JP |
219 | struct sk_buff *skb, struct tcmsg *t) |
220 | { | |
8113c095 | 221 | struct cls_mall_head *head = fh; |
bf3994d2 JP |
222 | struct nlattr *nest; |
223 | ||
fd62d9f5 | 224 | if (!head) |
bf3994d2 JP |
225 | return skb->len; |
226 | ||
fd62d9f5 | 227 | t->tcm_handle = head->handle; |
bf3994d2 JP |
228 | |
229 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
230 | if (!nest) | |
231 | goto nla_put_failure; | |
232 | ||
fd62d9f5 YG |
233 | if (head->res.classid && |
234 | nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) | |
bf3994d2 JP |
235 | goto nla_put_failure; |
236 | ||
7a335ada OG |
237 | if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) |
238 | goto nla_put_failure; | |
239 | ||
fd62d9f5 | 240 | if (tcf_exts_dump(skb, &head->exts)) |
bf3994d2 JP |
241 | goto nla_put_failure; |
242 | ||
243 | nla_nest_end(skb, nest); | |
244 | ||
fd62d9f5 | 245 | if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
bf3994d2 JP |
246 | goto nla_put_failure; |
247 | ||
248 | return skb->len; | |
249 | ||
250 | nla_put_failure: | |
251 | nla_nest_cancel(skb, nest); | |
252 | return -1; | |
253 | } | |
254 | ||
07d79fc7 CW |
255 | static void mall_bind_class(void *fh, u32 classid, unsigned long cl) |
256 | { | |
257 | struct cls_mall_head *head = fh; | |
258 | ||
259 | if (head && head->res.classid == classid) | |
260 | head->res.class = cl; | |
261 | } | |
262 | ||
bf3994d2 JP |
263 | static struct tcf_proto_ops cls_mall_ops __read_mostly = { |
264 | .kind = "matchall", | |
265 | .classify = mall_classify, | |
266 | .init = mall_init, | |
267 | .destroy = mall_destroy, | |
268 | .get = mall_get, | |
269 | .change = mall_change, | |
270 | .delete = mall_delete, | |
271 | .walk = mall_walk, | |
272 | .dump = mall_dump, | |
07d79fc7 | 273 | .bind_class = mall_bind_class, |
bf3994d2 JP |
274 | .owner = THIS_MODULE, |
275 | }; | |
276 | ||
277 | static int __init cls_mall_init(void) | |
278 | { | |
279 | return register_tcf_proto_ops(&cls_mall_ops); | |
280 | } | |
281 | ||
282 | static void __exit cls_mall_exit(void) | |
283 | { | |
284 | unregister_tcf_proto_ops(&cls_mall_ops); | |
285 | } | |
286 | ||
287 | module_init(cls_mall_init); | |
288 | module_exit(cls_mall_exit); | |
289 | ||
290 | MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); | |
291 | MODULE_DESCRIPTION("Match-all classifier"); | |
292 | MODULE_LICENSE("GPL v2"); |