Commit | Line | Data |
---|---|---|
7d1d65cb DB |
1 | /* |
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> | |
e2e9b654 DB |
19 | #include <linux/bpf.h> |
20 | ||
7d1d65cb DB |
21 | #include <net/rtnetlink.h> |
22 | #include <net/pkt_cls.h> | |
23 | #include <net/sock.h> | |
24 | ||
25 | MODULE_LICENSE("GPL"); | |
26 | MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); | |
27 | MODULE_DESCRIPTION("TC BPF based classifier"); | |
28 | ||
e2e9b654 DB |
29 | #define CLS_BPF_NAME_LEN 256 |
30 | ||
7d1d65cb DB |
31 | struct cls_bpf_head { |
32 | struct list_head plist; | |
33 | u32 hgen; | |
1f947bf1 | 34 | struct rcu_head rcu; |
7d1d65cb DB |
35 | }; |
36 | ||
37 | struct cls_bpf_prog { | |
7ae457c1 | 38 | struct bpf_prog *filter; |
7d1d65cb | 39 | struct list_head link; |
e2e9b654 | 40 | struct tcf_result res; |
045efa82 | 41 | bool exts_integrated; |
e2e9b654 | 42 | struct tcf_exts exts; |
7d1d65cb | 43 | u32 handle; |
e2e9b654 DB |
44 | union { |
45 | u32 bpf_fd; | |
46 | u16 bpf_num_ops; | |
47 | }; | |
48 | struct sock_filter *bpf_ops; | |
49 | const char *bpf_name; | |
1f947bf1 JF |
50 | struct tcf_proto *tp; |
51 | struct rcu_head rcu; | |
7d1d65cb DB |
52 | }; |
53 | ||
54 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
55 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 56 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
e2e9b654 DB |
57 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
58 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
59 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
60 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
61 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
62 | }; | |
63 | ||
045efa82 DB |
64 | static int cls_bpf_exec_opcode(int code) |
65 | { | |
66 | switch (code) { | |
67 | case TC_ACT_OK: | |
045efa82 | 68 | case TC_ACT_SHOT: |
045efa82 | 69 | case TC_ACT_STOLEN: |
27b29f63 | 70 | case TC_ACT_REDIRECT: |
045efa82 DB |
71 | case TC_ACT_UNSPEC: |
72 | return code; | |
73 | default: | |
74 | return TC_ACT_UNSPEC; | |
75 | } | |
76 | } | |
77 | ||
7d1d65cb DB |
78 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
79 | struct tcf_result *res) | |
80 | { | |
80dcbd12 | 81 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 82 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 83 | struct cls_bpf_prog *prog; |
54720df1 | 84 | int ret = -1; |
7d1d65cb | 85 | |
a166151c AS |
86 | if (unlikely(!skb_mac_header_was_set(skb))) |
87 | return -1; | |
88 | ||
54720df1 DB |
89 | /* Needed here for accessing maps. */ |
90 | rcu_read_lock(); | |
1f947bf1 | 91 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
92 | int filter_res; |
93 | ||
045efa82 DB |
94 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
95 | ||
3431205e AS |
96 | if (at_ingress) { |
97 | /* It is safe to push/pull even if skb_shared() */ | |
98 | __skb_push(skb, skb->mac_len); | |
99 | filter_res = BPF_PROG_RUN(prog->filter, skb); | |
100 | __skb_pull(skb, skb->mac_len); | |
101 | } else { | |
102 | filter_res = BPF_PROG_RUN(prog->filter, skb); | |
103 | } | |
7d1d65cb | 104 | |
045efa82 | 105 | if (prog->exts_integrated) { |
3a461da1 DB |
106 | res->class = 0; |
107 | res->classid = TC_H_MAJ(prog->res.classid) | | |
108 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
109 | |
110 | ret = cls_bpf_exec_opcode(filter_res); | |
111 | if (ret == TC_ACT_UNSPEC) | |
112 | continue; | |
113 | break; | |
114 | } | |
115 | ||
7d1d65cb DB |
116 | if (filter_res == 0) |
117 | continue; | |
3a461da1 DB |
118 | if (filter_res != -1) { |
119 | res->class = 0; | |
7d1d65cb | 120 | res->classid = filter_res; |
3a461da1 DB |
121 | } else { |
122 | *res = prog->res; | |
123 | } | |
7d1d65cb DB |
124 | |
125 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
126 | if (ret < 0) | |
127 | continue; | |
128 | ||
54720df1 | 129 | break; |
7d1d65cb | 130 | } |
54720df1 | 131 | rcu_read_unlock(); |
7d1d65cb | 132 | |
54720df1 | 133 | return ret; |
7d1d65cb DB |
134 | } |
135 | ||
e2e9b654 DB |
136 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
137 | { | |
138 | return !prog->bpf_ops; | |
139 | } | |
140 | ||
7d1d65cb DB |
141 | static int cls_bpf_init(struct tcf_proto *tp) |
142 | { | |
143 | struct cls_bpf_head *head; | |
144 | ||
145 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
146 | if (head == NULL) | |
147 | return -ENOBUFS; | |
148 | ||
1f947bf1 JF |
149 | INIT_LIST_HEAD_RCU(&head->plist); |
150 | rcu_assign_pointer(tp->root, head); | |
7d1d65cb DB |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog) | |
156 | { | |
18d0264f | 157 | tcf_exts_destroy(&prog->exts); |
7d1d65cb | 158 | |
e2e9b654 DB |
159 | if (cls_bpf_is_ebpf(prog)) |
160 | bpf_prog_put(prog->filter); | |
161 | else | |
162 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 163 | |
e2e9b654 | 164 | kfree(prog->bpf_name); |
7d1d65cb DB |
165 | kfree(prog->bpf_ops); |
166 | kfree(prog); | |
167 | } | |
168 | ||
1f947bf1 JF |
169 | static void __cls_bpf_delete_prog(struct rcu_head *rcu) |
170 | { | |
171 | struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu); | |
172 | ||
173 | cls_bpf_delete_prog(prog->tp, prog); | |
174 | } | |
175 | ||
7d1d65cb DB |
176 | static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg) |
177 | { | |
472f5837 | 178 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg; |
7d1d65cb | 179 | |
472f5837 JP |
180 | list_del_rcu(&prog->link); |
181 | tcf_unbind_filter(tp, &prog->res); | |
182 | call_rcu(&prog->rcu, __cls_bpf_delete_prog); | |
e2e9b654 | 183 | |
472f5837 | 184 | return 0; |
7d1d65cb DB |
185 | } |
186 | ||
1e052be6 | 187 | static bool cls_bpf_destroy(struct tcf_proto *tp, bool force) |
7d1d65cb | 188 | { |
1f947bf1 | 189 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
190 | struct cls_bpf_prog *prog, *tmp; |
191 | ||
1e052be6 CW |
192 | if (!force && !list_empty(&head->plist)) |
193 | return false; | |
194 | ||
7d1d65cb | 195 | list_for_each_entry_safe(prog, tmp, &head->plist, link) { |
1f947bf1 | 196 | list_del_rcu(&prog->link); |
18cdb37e | 197 | tcf_unbind_filter(tp, &prog->res); |
1f947bf1 | 198 | call_rcu(&prog->rcu, __cls_bpf_delete_prog); |
7d1d65cb DB |
199 | } |
200 | ||
1f947bf1 JF |
201 | RCU_INIT_POINTER(tp->root, NULL); |
202 | kfree_rcu(head, rcu); | |
1e052be6 | 203 | return true; |
7d1d65cb DB |
204 | } |
205 | ||
206 | static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle) | |
207 | { | |
1f947bf1 | 208 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
209 | struct cls_bpf_prog *prog; |
210 | unsigned long ret = 0UL; | |
211 | ||
212 | if (head == NULL) | |
213 | return 0UL; | |
214 | ||
3fe6b49e | 215 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
216 | if (prog->handle == handle) { |
217 | ret = (unsigned long) prog; | |
218 | break; | |
219 | } | |
220 | } | |
221 | ||
222 | return ret; | |
223 | } | |
224 | ||
045efa82 | 225 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 226 | { |
1f947bf1 | 227 | struct sock_filter *bpf_ops; |
e2e9b654 | 228 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 229 | struct bpf_prog *fp; |
33e9fcc6 | 230 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
231 | int ret; |
232 | ||
33e9fcc6 | 233 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
234 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
235 | return -EINVAL; | |
7d1d65cb | 236 | |
33e9fcc6 | 237 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
238 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
239 | return -EINVAL; | |
7913ecf6 | 240 | |
7d1d65cb | 241 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
242 | if (bpf_ops == NULL) |
243 | return -ENOMEM; | |
7d1d65cb DB |
244 | |
245 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
246 | ||
e2e9b654 DB |
247 | fprog_tmp.len = bpf_num_ops; |
248 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 249 | |
e2e9b654 DB |
250 | ret = bpf_prog_create(&fp, &fprog_tmp); |
251 | if (ret < 0) { | |
252 | kfree(bpf_ops); | |
253 | return ret; | |
254 | } | |
7d1d65cb | 255 | |
7d1d65cb | 256 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
257 | prog->bpf_num_ops = bpf_num_ops; |
258 | prog->bpf_name = NULL; | |
7d1d65cb | 259 | prog->filter = fp; |
7d1d65cb | 260 | |
e2e9b654 DB |
261 | return 0; |
262 | } | |
263 | ||
c46646d0 DB |
264 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
265 | const struct tcf_proto *tp) | |
e2e9b654 DB |
266 | { |
267 | struct bpf_prog *fp; | |
268 | char *name = NULL; | |
269 | u32 bpf_fd; | |
270 | ||
271 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
272 | ||
273 | fp = bpf_prog_get(bpf_fd); | |
274 | if (IS_ERR(fp)) | |
275 | return PTR_ERR(fp); | |
276 | ||
277 | if (fp->type != BPF_PROG_TYPE_SCHED_CLS) { | |
278 | bpf_prog_put(fp); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
282 | if (tb[TCA_BPF_NAME]) { | |
283 | name = kmemdup(nla_data(tb[TCA_BPF_NAME]), | |
284 | nla_len(tb[TCA_BPF_NAME]), | |
285 | GFP_KERNEL); | |
286 | if (!name) { | |
287 | bpf_prog_put(fp); | |
288 | return -ENOMEM; | |
289 | } | |
290 | } | |
291 | ||
292 | prog->bpf_ops = NULL; | |
293 | prog->bpf_fd = bpf_fd; | |
294 | prog->bpf_name = name; | |
e2e9b654 | 295 | prog->filter = fp; |
e2e9b654 | 296 | |
1f211a1b | 297 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
298 | netif_keep_dst(qdisc_dev(tp->q)); |
299 | ||
e2e9b654 DB |
300 | return 0; |
301 | } | |
302 | ||
303 | static 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, | |
306 | struct nlattr *est, bool ovr) | |
307 | { | |
045efa82 | 308 | bool is_bpf, is_ebpf, have_exts = false; |
e2e9b654 | 309 | struct tcf_exts exts; |
e2e9b654 DB |
310 | int ret; |
311 | ||
312 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
313 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 314 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
315 | return -EINVAL; |
316 | ||
317 | tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE); | |
318 | ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr); | |
319 | if (ret < 0) | |
320 | return ret; | |
321 | ||
045efa82 DB |
322 | if (tb[TCA_BPF_FLAGS]) { |
323 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
324 | ||
325 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { | |
326 | tcf_exts_destroy(&exts); | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
330 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
331 | } | |
332 | ||
045efa82 | 333 | prog->exts_integrated = have_exts; |
e2e9b654 | 334 | |
045efa82 | 335 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
c46646d0 | 336 | cls_bpf_prog_from_efd(tb, prog, tp); |
e2e9b654 DB |
337 | if (ret < 0) { |
338 | tcf_exts_destroy(&exts); | |
339 | return ret; | |
340 | } | |
341 | ||
ef146fa4 DB |
342 | if (tb[TCA_BPF_CLASSID]) { |
343 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
344 | tcf_bind_filter(tp, &prog->res, base); | |
345 | } | |
7d1d65cb | 346 | |
ef146fa4 | 347 | tcf_exts_change(tp, &prog->exts, &exts); |
7d1d65cb | 348 | return 0; |
7d1d65cb DB |
349 | } |
350 | ||
351 | static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, | |
352 | struct cls_bpf_head *head) | |
353 | { | |
354 | unsigned int i = 0x80000000; | |
3f2ab135 | 355 | u32 handle; |
7d1d65cb DB |
356 | |
357 | do { | |
358 | if (++head->hgen == 0x7FFFFFFF) | |
359 | head->hgen = 1; | |
360 | } while (--i > 0 && cls_bpf_get(tp, head->hgen)); | |
3f2ab135 DB |
361 | |
362 | if (unlikely(i == 0)) { | |
7d1d65cb | 363 | pr_err("Insufficient number of handles\n"); |
3f2ab135 DB |
364 | handle = 0; |
365 | } else { | |
366 | handle = head->hgen; | |
367 | } | |
7d1d65cb | 368 | |
3f2ab135 | 369 | return handle; |
7d1d65cb DB |
370 | } |
371 | ||
372 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, | |
373 | struct tcf_proto *tp, unsigned long base, | |
374 | u32 handle, struct nlattr **tca, | |
2f7ef2f8 | 375 | unsigned long *arg, bool ovr) |
7d1d65cb | 376 | { |
1f947bf1 JF |
377 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
378 | struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg; | |
7d1d65cb | 379 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 380 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
381 | int ret; |
382 | ||
383 | if (tca[TCA_OPTIONS] == NULL) | |
384 | return -EINVAL; | |
385 | ||
386 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy); | |
387 | if (ret < 0) | |
388 | return ret; | |
389 | ||
7d1d65cb | 390 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 391 | if (!prog) |
7d1d65cb DB |
392 | return -ENOBUFS; |
393 | ||
5da57f42 | 394 | tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
1f947bf1 JF |
395 | |
396 | if (oldprog) { | |
397 | if (handle && oldprog->handle != handle) { | |
398 | ret = -EINVAL; | |
399 | goto errout; | |
400 | } | |
401 | } | |
402 | ||
7d1d65cb DB |
403 | if (handle == 0) |
404 | prog->handle = cls_bpf_grab_new_handle(tp, head); | |
405 | else | |
406 | prog->handle = handle; | |
407 | if (prog->handle == 0) { | |
408 | ret = -EINVAL; | |
409 | goto errout; | |
410 | } | |
411 | ||
2f7ef2f8 | 412 | ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE], ovr); |
7d1d65cb DB |
413 | if (ret < 0) |
414 | goto errout; | |
415 | ||
1f947bf1 | 416 | if (oldprog) { |
f6bfc46d | 417 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 418 | tcf_unbind_filter(tp, &oldprog->res); |
1f947bf1 JF |
419 | call_rcu(&oldprog->rcu, __cls_bpf_delete_prog); |
420 | } else { | |
421 | list_add_rcu(&prog->link, &head->plist); | |
422 | } | |
7d1d65cb DB |
423 | |
424 | *arg = (unsigned long) prog; | |
7d1d65cb DB |
425 | return 0; |
426 | errout: | |
1f947bf1 | 427 | kfree(prog); |
7d1d65cb DB |
428 | |
429 | return ret; | |
430 | } | |
431 | ||
e2e9b654 DB |
432 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
433 | struct sk_buff *skb) | |
434 | { | |
435 | struct nlattr *nla; | |
436 | ||
437 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
438 | return -EMSGSIZE; | |
439 | ||
440 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
441 | sizeof(struct sock_filter)); | |
442 | if (nla == NULL) | |
443 | return -EMSGSIZE; | |
444 | ||
445 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
451 | struct sk_buff *skb) | |
452 | { | |
453 | if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd)) | |
454 | return -EMSGSIZE; | |
455 | ||
456 | if (prog->bpf_name && | |
457 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
458 | return -EMSGSIZE; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
832d1d5b | 463 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
7d1d65cb DB |
464 | struct sk_buff *skb, struct tcmsg *tm) |
465 | { | |
466 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh; | |
e2e9b654 | 467 | struct nlattr *nest; |
bf007d1c | 468 | u32 bpf_flags = 0; |
e2e9b654 | 469 | int ret; |
7d1d65cb DB |
470 | |
471 | if (prog == NULL) | |
472 | return skb->len; | |
473 | ||
474 | tm->tcm_handle = prog->handle; | |
475 | ||
476 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
477 | if (nest == NULL) | |
478 | goto nla_put_failure; | |
479 | ||
ef146fa4 DB |
480 | if (prog->res.classid && |
481 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 482 | goto nla_put_failure; |
7d1d65cb | 483 | |
e2e9b654 DB |
484 | 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) | |
7d1d65cb DB |
489 | goto nla_put_failure; |
490 | ||
5da57f42 | 491 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
492 | goto nla_put_failure; |
493 | ||
bf007d1c DB |
494 | if (prog->exts_integrated) |
495 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
496 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
497 | goto nla_put_failure; | |
498 | ||
7d1d65cb DB |
499 | nla_nest_end(skb, nest); |
500 | ||
5da57f42 | 501 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
502 | goto nla_put_failure; |
503 | ||
504 | return skb->len; | |
505 | ||
506 | nla_put_failure: | |
507 | nla_nest_cancel(skb, nest); | |
508 | return -1; | |
509 | } | |
510 | ||
511 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
512 | { | |
1f947bf1 | 513 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
514 | struct cls_bpf_prog *prog; |
515 | ||
3fe6b49e | 516 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
517 | if (arg->count < arg->skip) |
518 | goto skip; | |
519 | if (arg->fn(tp, (unsigned long) prog, arg) < 0) { | |
520 | arg->stop = 1; | |
521 | break; | |
522 | } | |
523 | skip: | |
524 | arg->count++; | |
525 | } | |
526 | } | |
527 | ||
528 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
529 | .kind = "bpf", | |
530 | .owner = THIS_MODULE, | |
531 | .classify = cls_bpf_classify, | |
532 | .init = cls_bpf_init, | |
533 | .destroy = cls_bpf_destroy, | |
534 | .get = cls_bpf_get, | |
7d1d65cb DB |
535 | .change = cls_bpf_change, |
536 | .delete = cls_bpf_delete, | |
537 | .walk = cls_bpf_walk, | |
538 | .dump = cls_bpf_dump, | |
539 | }; | |
540 | ||
541 | static int __init cls_bpf_init_mod(void) | |
542 | { | |
543 | return register_tcf_proto_ops(&cls_bpf_ops); | |
544 | } | |
545 | ||
546 | static void __exit cls_bpf_exit_mod(void) | |
547 | { | |
548 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
549 | } | |
550 | ||
551 | module_init(cls_bpf_init_mod); | |
552 | module_exit(cls_bpf_exit_mod); |