blob: 77b0ef14825686dee469d61b6142538bb7e5f83d [file] [log] [blame]
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +01001/*
2 * Berkeley Packet Filter based traffic classifier
3 *
4 * Might be used to classify traffic through flexible, user-defined and
5 * possibly JIT-ed BPF filters for traffic control as an alternative to
6 * ematches.
7 *
8 * (C) 2013 Daniel Borkmann <dborkman@redhat.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/skbuff.h>
18#include <linux/filter.h>
Daniel Borkmanne2e9b652015-03-01 12:31:48 +010019#include <linux/bpf.h>
20
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010021#include <net/rtnetlink.h>
22#include <net/pkt_cls.h>
23#include <net/sock.h>
24
25MODULE_LICENSE("GPL");
26MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
27MODULE_DESCRIPTION("TC BPF based classifier");
28
Daniel Borkmanne2e9b652015-03-01 12:31:48 +010029#define CLS_BPF_NAME_LEN 256
30
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010031struct cls_bpf_head {
32 struct list_head plist;
33 u32 hgen;
John Fastabend1f947bf2014-09-12 20:10:24 -070034 struct rcu_head rcu;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010035};
36
37struct cls_bpf_prog {
Alexei Starovoitov7ae457c2014-07-30 20:34:16 -070038 struct bpf_prog *filter;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010039 struct list_head link;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +010040 struct tcf_result res;
Daniel Borkmann045efa82015-09-15 23:05:42 -070041 bool exts_integrated;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +010042 struct tcf_exts exts;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010043 u32 handle;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +010044 union {
45 u32 bpf_fd;
46 u16 bpf_num_ops;
47 };
48 struct sock_filter *bpf_ops;
49 const char *bpf_name;
John Fastabend1f947bf2014-09-12 20:10:24 -070050 struct tcf_proto *tp;
51 struct rcu_head rcu;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010052};
53
54static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
55 [TCA_BPF_CLASSID] = { .type = NLA_U32 },
Daniel Borkmann045efa82015-09-15 23:05:42 -070056 [TCA_BPF_FLAGS] = { .type = NLA_U32 },
Daniel Borkmanne2e9b652015-03-01 12:31:48 +010057 [TCA_BPF_FD] = { .type = NLA_U32 },
58 [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, .len = CLS_BPF_NAME_LEN },
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010059 [TCA_BPF_OPS_LEN] = { .type = NLA_U16 },
60 [TCA_BPF_OPS] = { .type = NLA_BINARY,
61 .len = sizeof(struct sock_filter) * BPF_MAXINSNS },
62};
63
Daniel Borkmann045efa82015-09-15 23:05:42 -070064static int cls_bpf_exec_opcode(int code)
65{
66 switch (code) {
67 case TC_ACT_OK:
68 case TC_ACT_RECLASSIFY:
69 case TC_ACT_SHOT:
70 case TC_ACT_PIPE:
71 case TC_ACT_STOLEN:
72 case TC_ACT_QUEUED:
73 case TC_ACT_UNSPEC:
74 return code;
75 default:
76 return TC_ACT_UNSPEC;
77 }
78}
79
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010080static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
81 struct tcf_result *res)
82{
WANG Cong80dcbd12014-09-15 14:21:50 -070083 struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010084 struct cls_bpf_prog *prog;
Alexei Starovoitov34312052015-06-04 10:11:53 -070085#ifdef CONFIG_NET_CLS_ACT
86 bool at_ingress = G_TC_AT(skb->tc_verd) & AT_INGRESS;
87#else
88 bool at_ingress = false;
89#endif
Daniel Borkmann54720df2015-03-12 20:03:12 +010090 int ret = -1;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +010091
Alexei Starovoitova1661512015-04-15 12:55:45 -070092 if (unlikely(!skb_mac_header_was_set(skb)))
93 return -1;
94
Daniel Borkmann54720df2015-03-12 20:03:12 +010095 /* Needed here for accessing maps. */
96 rcu_read_lock();
John Fastabend1f947bf2014-09-12 20:10:24 -070097 list_for_each_entry_rcu(prog, &head->plist, link) {
Alexei Starovoitov34312052015-06-04 10:11:53 -070098 int filter_res;
99
Daniel Borkmann045efa82015-09-15 23:05:42 -0700100 qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
101
Alexei Starovoitov34312052015-06-04 10:11:53 -0700102 if (at_ingress) {
103 /* It is safe to push/pull even if skb_shared() */
104 __skb_push(skb, skb->mac_len);
105 filter_res = BPF_PROG_RUN(prog->filter, skb);
106 __skb_pull(skb, skb->mac_len);
107 } else {
108 filter_res = BPF_PROG_RUN(prog->filter, skb);
109 }
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100110
Daniel Borkmann045efa82015-09-15 23:05:42 -0700111 if (prog->exts_integrated) {
112 res->class = prog->res.class;
113 res->classid = qdisc_skb_cb(skb)->tc_classid;
114
115 ret = cls_bpf_exec_opcode(filter_res);
116 if (ret == TC_ACT_UNSPEC)
117 continue;
118 break;
119 }
120
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100121 if (filter_res == 0)
122 continue;
123
124 *res = prog->res;
125 if (filter_res != -1)
126 res->classid = filter_res;
127
128 ret = tcf_exts_exec(skb, &prog->exts, res);
129 if (ret < 0)
130 continue;
131
Daniel Borkmann54720df2015-03-12 20:03:12 +0100132 break;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100133 }
Daniel Borkmann54720df2015-03-12 20:03:12 +0100134 rcu_read_unlock();
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100135
Daniel Borkmann54720df2015-03-12 20:03:12 +0100136 return ret;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100137}
138
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100139static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
140{
141 return !prog->bpf_ops;
142}
143
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100144static int cls_bpf_init(struct tcf_proto *tp)
145{
146 struct cls_bpf_head *head;
147
148 head = kzalloc(sizeof(*head), GFP_KERNEL);
149 if (head == NULL)
150 return -ENOBUFS;
151
John Fastabend1f947bf2014-09-12 20:10:24 -0700152 INIT_LIST_HEAD_RCU(&head->plist);
153 rcu_assign_pointer(tp->root, head);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100154
155 return 0;
156}
157
158static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog)
159{
WANG Cong18d02642014-09-25 10:26:37 -0700160 tcf_exts_destroy(&prog->exts);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100161
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100162 if (cls_bpf_is_ebpf(prog))
163 bpf_prog_put(prog->filter);
164 else
165 bpf_prog_destroy(prog->filter);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100166
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100167 kfree(prog->bpf_name);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100168 kfree(prog->bpf_ops);
169 kfree(prog);
170}
171
John Fastabend1f947bf2014-09-12 20:10:24 -0700172static void __cls_bpf_delete_prog(struct rcu_head *rcu)
173{
174 struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);
175
176 cls_bpf_delete_prog(prog->tp, prog);
177}
178
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100179static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
180{
Jiri Pirko472f5832014-12-02 18:00:32 +0100181 struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100182
Jiri Pirko472f5832014-12-02 18:00:32 +0100183 list_del_rcu(&prog->link);
184 tcf_unbind_filter(tp, &prog->res);
185 call_rcu(&prog->rcu, __cls_bpf_delete_prog);
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100186
Jiri Pirko472f5832014-12-02 18:00:32 +0100187 return 0;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100188}
189
Cong Wang1e052be2015-03-06 11:47:59 -0800190static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100191{
John Fastabend1f947bf2014-09-12 20:10:24 -0700192 struct cls_bpf_head *head = rtnl_dereference(tp->root);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100193 struct cls_bpf_prog *prog, *tmp;
194
Cong Wang1e052be2015-03-06 11:47:59 -0800195 if (!force && !list_empty(&head->plist))
196 return false;
197
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100198 list_for_each_entry_safe(prog, tmp, &head->plist, link) {
John Fastabend1f947bf2014-09-12 20:10:24 -0700199 list_del_rcu(&prog->link);
John Fastabend18cdb372014-10-05 21:28:52 -0700200 tcf_unbind_filter(tp, &prog->res);
John Fastabend1f947bf2014-09-12 20:10:24 -0700201 call_rcu(&prog->rcu, __cls_bpf_delete_prog);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100202 }
203
John Fastabend1f947bf2014-09-12 20:10:24 -0700204 RCU_INIT_POINTER(tp->root, NULL);
205 kfree_rcu(head, rcu);
Cong Wang1e052be2015-03-06 11:47:59 -0800206 return true;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100207}
208
209static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
210{
John Fastabend1f947bf2014-09-12 20:10:24 -0700211 struct cls_bpf_head *head = rtnl_dereference(tp->root);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100212 struct cls_bpf_prog *prog;
213 unsigned long ret = 0UL;
214
215 if (head == NULL)
216 return 0UL;
217
Jiri Pirko3fe6b492014-12-02 18:00:33 +0100218 list_for_each_entry(prog, &head->plist, link) {
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100219 if (prog->handle == handle) {
220 ret = (unsigned long) prog;
221 break;
222 }
223 }
224
225 return ret;
226}
227
Daniel Borkmann045efa82015-09-15 23:05:42 -0700228static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100229{
230 struct sock_filter *bpf_ops;
231 struct sock_fprog_kern fprog_tmp;
232 struct bpf_prog *fp;
233 u16 bpf_size, bpf_num_ops;
234 int ret;
235
236 bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
237 if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
238 return -EINVAL;
239
240 bpf_size = bpf_num_ops * sizeof(*bpf_ops);
241 if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
242 return -EINVAL;
243
244 bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
245 if (bpf_ops == NULL)
246 return -ENOMEM;
247
248 memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);
249
250 fprog_tmp.len = bpf_num_ops;
251 fprog_tmp.filter = bpf_ops;
252
253 ret = bpf_prog_create(&fp, &fprog_tmp);
254 if (ret < 0) {
255 kfree(bpf_ops);
256 return ret;
257 }
258
259 prog->bpf_ops = bpf_ops;
260 prog->bpf_num_ops = bpf_num_ops;
261 prog->bpf_name = NULL;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100262 prog->filter = fp;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100263
264 return 0;
265}
266
Daniel Borkmann045efa82015-09-15 23:05:42 -0700267static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
268 const struct tcf_proto *tp)
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100269{
270 struct bpf_prog *fp;
271 char *name = NULL;
272 u32 bpf_fd;
273
274 bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
275
276 fp = bpf_prog_get(bpf_fd);
277 if (IS_ERR(fp))
278 return PTR_ERR(fp);
279
280 if (fp->type != BPF_PROG_TYPE_SCHED_CLS) {
281 bpf_prog_put(fp);
282 return -EINVAL;
283 }
284
285 if (tb[TCA_BPF_NAME]) {
286 name = kmemdup(nla_data(tb[TCA_BPF_NAME]),
287 nla_len(tb[TCA_BPF_NAME]),
288 GFP_KERNEL);
289 if (!name) {
290 bpf_prog_put(fp);
291 return -ENOMEM;
292 }
293 }
294
295 prog->bpf_ops = NULL;
296 prog->bpf_fd = bpf_fd;
297 prog->bpf_name = name;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100298 prog->filter = fp;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100299
300 return 0;
301}
302
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100303static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp,
304 struct cls_bpf_prog *prog,
305 unsigned long base, struct nlattr **tb,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700306 struct nlattr *est, bool ovr)
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100307{
Daniel Borkmann045efa82015-09-15 23:05:42 -0700308 bool is_bpf, is_ebpf, have_exts = false;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100309 struct tcf_exts exts;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100310 u32 classid;
311 int ret;
312
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100313 is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
314 is_ebpf = tb[TCA_BPF_FD];
315
316 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf) ||
317 !tb[TCA_BPF_CLASSID])
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100318 return -EINVAL;
319
WANG Cong5da57f42013-12-15 20:15:07 -0800320 tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE);
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700321 ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100322 if (ret < 0)
323 return ret;
324
325 classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
Daniel Borkmann045efa82015-09-15 23:05:42 -0700326 if (tb[TCA_BPF_FLAGS]) {
327 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100328
Daniel Borkmann045efa82015-09-15 23:05:42 -0700329 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) {
330 tcf_exts_destroy(&exts);
331 return -EINVAL;
332 }
333
334 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
335 }
336
337 prog->res.classid = classid;
338 prog->exts_integrated = have_exts;
339
340 ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
341 cls_bpf_prog_from_efd(tb, prog, tp);
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100342 if (ret < 0) {
343 tcf_exts_destroy(&exts);
344 return ret;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100345 }
346
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100347 tcf_bind_filter(tp, &prog->res, base);
348 tcf_exts_change(tp, &prog->exts, &exts);
349
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100350 return 0;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100351}
352
353static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
354 struct cls_bpf_head *head)
355{
356 unsigned int i = 0x80000000;
Daniel Borkmann3f2ab132015-01-22 10:41:02 +0100357 u32 handle;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100358
359 do {
360 if (++head->hgen == 0x7FFFFFFF)
361 head->hgen = 1;
362 } while (--i > 0 && cls_bpf_get(tp, head->hgen));
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100363
Daniel Borkmann3f2ab132015-01-22 10:41:02 +0100364 if (unlikely(i == 0)) {
365 pr_err("Insufficient number of handles\n");
366 handle = 0;
367 } else {
368 handle = head->hgen;
369 }
370
371 return handle;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100372}
373
374static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
375 struct tcf_proto *tp, unsigned long base,
376 u32 handle, struct nlattr **tca,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700377 unsigned long *arg, bool ovr)
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100378{
John Fastabend1f947bf2014-09-12 20:10:24 -0700379 struct cls_bpf_head *head = rtnl_dereference(tp->root);
380 struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100381 struct nlattr *tb[TCA_BPF_MAX + 1];
John Fastabend1f947bf2014-09-12 20:10:24 -0700382 struct cls_bpf_prog *prog;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100383 int ret;
384
385 if (tca[TCA_OPTIONS] == NULL)
386 return -EINVAL;
387
388 ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy);
389 if (ret < 0)
390 return ret;
391
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100392 prog = kzalloc(sizeof(*prog), GFP_KERNEL);
John Fastabend1f947bf2014-09-12 20:10:24 -0700393 if (!prog)
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100394 return -ENOBUFS;
395
WANG Cong5da57f42013-12-15 20:15:07 -0800396 tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
John Fastabend1f947bf2014-09-12 20:10:24 -0700397
398 if (oldprog) {
399 if (handle && oldprog->handle != handle) {
400 ret = -EINVAL;
401 goto errout;
402 }
403 }
404
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100405 if (handle == 0)
406 prog->handle = cls_bpf_grab_new_handle(tp, head);
407 else
408 prog->handle = handle;
409 if (prog->handle == 0) {
410 ret = -EINVAL;
411 goto errout;
412 }
413
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700414 ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE], ovr);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100415 if (ret < 0)
416 goto errout;
417
John Fastabend1f947bf2014-09-12 20:10:24 -0700418 if (oldprog) {
Daniel Borkmannf6bfc462015-07-17 22:38:43 +0200419 list_replace_rcu(&oldprog->link, &prog->link);
John Fastabend18cdb372014-10-05 21:28:52 -0700420 tcf_unbind_filter(tp, &oldprog->res);
John Fastabend1f947bf2014-09-12 20:10:24 -0700421 call_rcu(&oldprog->rcu, __cls_bpf_delete_prog);
422 } else {
423 list_add_rcu(&prog->link, &head->plist);
424 }
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100425
426 *arg = (unsigned long) prog;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100427 return 0;
428errout:
John Fastabend1f947bf2014-09-12 20:10:24 -0700429 kfree(prog);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100430
431 return ret;
432}
433
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100434static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
435 struct sk_buff *skb)
436{
437 struct nlattr *nla;
438
439 if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
440 return -EMSGSIZE;
441
442 nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
443 sizeof(struct sock_filter));
444 if (nla == NULL)
445 return -EMSGSIZE;
446
447 memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
448
449 return 0;
450}
451
452static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
453 struct sk_buff *skb)
454{
455 if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd))
456 return -EMSGSIZE;
457
458 if (prog->bpf_name &&
459 nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
460 return -EMSGSIZE;
461
462 return 0;
463}
464
WANG Cong832d1d52014-01-09 16:14:01 -0800465static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100466 struct sk_buff *skb, struct tcmsg *tm)
467{
468 struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh;
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100469 struct nlattr *nest;
470 int ret;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100471
472 if (prog == NULL)
473 return skb->len;
474
475 tm->tcm_handle = prog->handle;
476
477 nest = nla_nest_start(skb, TCA_OPTIONS);
478 if (nest == NULL)
479 goto nla_put_failure;
480
481 if (nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
482 goto nla_put_failure;
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100483
Daniel Borkmanne2e9b652015-03-01 12:31:48 +0100484 if (cls_bpf_is_ebpf(prog))
485 ret = cls_bpf_dump_ebpf_info(prog, skb);
486 else
487 ret = cls_bpf_dump_bpf_info(prog, skb);
488 if (ret)
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100489 goto nla_put_failure;
490
WANG Cong5da57f42013-12-15 20:15:07 -0800491 if (tcf_exts_dump(skb, &prog->exts) < 0)
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100492 goto nla_put_failure;
493
494 nla_nest_end(skb, nest);
495
WANG Cong5da57f42013-12-15 20:15:07 -0800496 if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100497 goto nla_put_failure;
498
499 return skb->len;
500
501nla_put_failure:
502 nla_nest_cancel(skb, nest);
503 return -1;
504}
505
506static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg)
507{
John Fastabend1f947bf2014-09-12 20:10:24 -0700508 struct cls_bpf_head *head = rtnl_dereference(tp->root);
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100509 struct cls_bpf_prog *prog;
510
Jiri Pirko3fe6b492014-12-02 18:00:33 +0100511 list_for_each_entry(prog, &head->plist, link) {
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100512 if (arg->count < arg->skip)
513 goto skip;
514 if (arg->fn(tp, (unsigned long) prog, arg) < 0) {
515 arg->stop = 1;
516 break;
517 }
518skip:
519 arg->count++;
520 }
521}
522
523static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
524 .kind = "bpf",
525 .owner = THIS_MODULE,
526 .classify = cls_bpf_classify,
527 .init = cls_bpf_init,
528 .destroy = cls_bpf_destroy,
529 .get = cls_bpf_get,
Daniel Borkmann7d1d65c2013-10-28 16:43:02 +0100530 .change = cls_bpf_change,
531 .delete = cls_bpf_delete,
532 .walk = cls_bpf_walk,
533 .dump = cls_bpf_dump,
534};
535
536static int __init cls_bpf_init_mod(void)
537{
538 return register_tcf_proto_ops(&cls_bpf_ops);
539}
540
541static void __exit cls_bpf_exit_mod(void)
542{
543 unregister_tcf_proto_ops(&cls_bpf_ops);
544}
545
546module_init(cls_bpf_init_mod);
547module_exit(cls_bpf_exit_mod);