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); | |
db58ba45 | 99 | bpf_compute_data_end(skb); |
3431205e AS |
100 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
101 | __skb_pull(skb, skb->mac_len); | |
102 | } else { | |
db58ba45 | 103 | bpf_compute_data_end(skb); |
3431205e AS |
104 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
105 | } | |
7d1d65cb | 106 | |
045efa82 | 107 | if (prog->exts_integrated) { |
3a461da1 DB |
108 | res->class = 0; |
109 | res->classid = TC_H_MAJ(prog->res.classid) | | |
110 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
111 | |
112 | ret = cls_bpf_exec_opcode(filter_res); | |
113 | if (ret == TC_ACT_UNSPEC) | |
114 | continue; | |
115 | break; | |
116 | } | |
117 | ||
7d1d65cb DB |
118 | if (filter_res == 0) |
119 | continue; | |
3a461da1 DB |
120 | if (filter_res != -1) { |
121 | res->class = 0; | |
7d1d65cb | 122 | res->classid = filter_res; |
3a461da1 DB |
123 | } else { |
124 | *res = prog->res; | |
125 | } | |
7d1d65cb DB |
126 | |
127 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
128 | if (ret < 0) | |
129 | continue; | |
130 | ||
54720df1 | 131 | break; |
7d1d65cb | 132 | } |
54720df1 | 133 | rcu_read_unlock(); |
7d1d65cb | 134 | |
54720df1 | 135 | return ret; |
7d1d65cb DB |
136 | } |
137 | ||
e2e9b654 DB |
138 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
139 | { | |
140 | return !prog->bpf_ops; | |
141 | } | |
142 | ||
7d1d65cb DB |
143 | static int cls_bpf_init(struct tcf_proto *tp) |
144 | { | |
145 | struct cls_bpf_head *head; | |
146 | ||
147 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
148 | if (head == NULL) | |
149 | return -ENOBUFS; | |
150 | ||
1f947bf1 JF |
151 | INIT_LIST_HEAD_RCU(&head->plist); |
152 | rcu_assign_pointer(tp->root, head); | |
7d1d65cb DB |
153 | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog) | |
158 | { | |
18d0264f | 159 | tcf_exts_destroy(&prog->exts); |
7d1d65cb | 160 | |
e2e9b654 DB |
161 | if (cls_bpf_is_ebpf(prog)) |
162 | bpf_prog_put(prog->filter); | |
163 | else | |
164 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 165 | |
e2e9b654 | 166 | kfree(prog->bpf_name); |
7d1d65cb DB |
167 | kfree(prog->bpf_ops); |
168 | kfree(prog); | |
169 | } | |
170 | ||
1f947bf1 JF |
171 | static void __cls_bpf_delete_prog(struct rcu_head *rcu) |
172 | { | |
173 | struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu); | |
174 | ||
175 | cls_bpf_delete_prog(prog->tp, prog); | |
176 | } | |
177 | ||
7d1d65cb DB |
178 | static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg) |
179 | { | |
472f5837 | 180 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg; |
7d1d65cb | 181 | |
472f5837 JP |
182 | list_del_rcu(&prog->link); |
183 | tcf_unbind_filter(tp, &prog->res); | |
184 | call_rcu(&prog->rcu, __cls_bpf_delete_prog); | |
e2e9b654 | 185 | |
472f5837 | 186 | return 0; |
7d1d65cb DB |
187 | } |
188 | ||
1e052be6 | 189 | static bool cls_bpf_destroy(struct tcf_proto *tp, bool force) |
7d1d65cb | 190 | { |
1f947bf1 | 191 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
192 | struct cls_bpf_prog *prog, *tmp; |
193 | ||
1e052be6 CW |
194 | if (!force && !list_empty(&head->plist)) |
195 | return false; | |
196 | ||
7d1d65cb | 197 | list_for_each_entry_safe(prog, tmp, &head->plist, link) { |
1f947bf1 | 198 | list_del_rcu(&prog->link); |
18cdb37e | 199 | tcf_unbind_filter(tp, &prog->res); |
1f947bf1 | 200 | call_rcu(&prog->rcu, __cls_bpf_delete_prog); |
7d1d65cb DB |
201 | } |
202 | ||
1f947bf1 JF |
203 | RCU_INIT_POINTER(tp->root, NULL); |
204 | kfree_rcu(head, rcu); | |
1e052be6 | 205 | return true; |
7d1d65cb DB |
206 | } |
207 | ||
208 | static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle) | |
209 | { | |
1f947bf1 | 210 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
211 | struct cls_bpf_prog *prog; |
212 | unsigned long ret = 0UL; | |
213 | ||
214 | if (head == NULL) | |
215 | return 0UL; | |
216 | ||
3fe6b49e | 217 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
218 | if (prog->handle == handle) { |
219 | ret = (unsigned long) prog; | |
220 | break; | |
221 | } | |
222 | } | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
045efa82 | 227 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 228 | { |
1f947bf1 | 229 | struct sock_filter *bpf_ops; |
e2e9b654 | 230 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 231 | struct bpf_prog *fp; |
33e9fcc6 | 232 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
233 | int ret; |
234 | ||
33e9fcc6 | 235 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
236 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
237 | return -EINVAL; | |
7d1d65cb | 238 | |
33e9fcc6 | 239 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
240 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
241 | return -EINVAL; | |
7913ecf6 | 242 | |
7d1d65cb | 243 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
244 | if (bpf_ops == NULL) |
245 | return -ENOMEM; | |
7d1d65cb DB |
246 | |
247 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
248 | ||
e2e9b654 DB |
249 | fprog_tmp.len = bpf_num_ops; |
250 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 251 | |
e2e9b654 DB |
252 | ret = bpf_prog_create(&fp, &fprog_tmp); |
253 | if (ret < 0) { | |
254 | kfree(bpf_ops); | |
255 | return ret; | |
256 | } | |
7d1d65cb | 257 | |
7d1d65cb | 258 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
259 | prog->bpf_num_ops = bpf_num_ops; |
260 | prog->bpf_name = NULL; | |
7d1d65cb | 261 | prog->filter = fp; |
7d1d65cb | 262 | |
e2e9b654 DB |
263 | return 0; |
264 | } | |
265 | ||
c46646d0 DB |
266 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
267 | const struct tcf_proto *tp) | |
e2e9b654 DB |
268 | { |
269 | struct bpf_prog *fp; | |
270 | char *name = NULL; | |
271 | u32 bpf_fd; | |
272 | ||
273 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
274 | ||
113214be | 275 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS); |
e2e9b654 DB |
276 | if (IS_ERR(fp)) |
277 | return PTR_ERR(fp); | |
278 | ||
e2e9b654 DB |
279 | if (tb[TCA_BPF_NAME]) { |
280 | name = kmemdup(nla_data(tb[TCA_BPF_NAME]), | |
281 | nla_len(tb[TCA_BPF_NAME]), | |
282 | GFP_KERNEL); | |
283 | if (!name) { | |
284 | bpf_prog_put(fp); | |
285 | return -ENOMEM; | |
286 | } | |
287 | } | |
288 | ||
289 | prog->bpf_ops = NULL; | |
290 | prog->bpf_fd = bpf_fd; | |
291 | prog->bpf_name = name; | |
e2e9b654 | 292 | prog->filter = fp; |
e2e9b654 | 293 | |
1f211a1b | 294 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
295 | netif_keep_dst(qdisc_dev(tp->q)); |
296 | ||
e2e9b654 DB |
297 | return 0; |
298 | } | |
299 | ||
300 | static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, | |
301 | struct cls_bpf_prog *prog, | |
302 | unsigned long base, struct nlattr **tb, | |
303 | struct nlattr *est, bool ovr) | |
304 | { | |
045efa82 | 305 | bool is_bpf, is_ebpf, have_exts = false; |
e2e9b654 | 306 | struct tcf_exts exts; |
e2e9b654 DB |
307 | int ret; |
308 | ||
309 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
310 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 311 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
312 | return -EINVAL; |
313 | ||
314 | tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE); | |
315 | ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr); | |
316 | if (ret < 0) | |
317 | return ret; | |
318 | ||
045efa82 DB |
319 | if (tb[TCA_BPF_FLAGS]) { |
320 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
321 | ||
322 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { | |
323 | tcf_exts_destroy(&exts); | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
328 | } | |
329 | ||
045efa82 | 330 | prog->exts_integrated = have_exts; |
e2e9b654 | 331 | |
045efa82 | 332 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
c46646d0 | 333 | cls_bpf_prog_from_efd(tb, prog, tp); |
e2e9b654 DB |
334 | if (ret < 0) { |
335 | tcf_exts_destroy(&exts); | |
336 | return ret; | |
337 | } | |
338 | ||
ef146fa4 DB |
339 | if (tb[TCA_BPF_CLASSID]) { |
340 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
341 | tcf_bind_filter(tp, &prog->res, base); | |
342 | } | |
7d1d65cb | 343 | |
ef146fa4 | 344 | tcf_exts_change(tp, &prog->exts, &exts); |
7d1d65cb | 345 | return 0; |
7d1d65cb DB |
346 | } |
347 | ||
348 | static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, | |
349 | struct cls_bpf_head *head) | |
350 | { | |
351 | unsigned int i = 0x80000000; | |
3f2ab135 | 352 | u32 handle; |
7d1d65cb DB |
353 | |
354 | do { | |
355 | if (++head->hgen == 0x7FFFFFFF) | |
356 | head->hgen = 1; | |
357 | } while (--i > 0 && cls_bpf_get(tp, head->hgen)); | |
3f2ab135 DB |
358 | |
359 | if (unlikely(i == 0)) { | |
7d1d65cb | 360 | pr_err("Insufficient number of handles\n"); |
3f2ab135 DB |
361 | handle = 0; |
362 | } else { | |
363 | handle = head->hgen; | |
364 | } | |
7d1d65cb | 365 | |
3f2ab135 | 366 | return handle; |
7d1d65cb DB |
367 | } |
368 | ||
369 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, | |
370 | struct tcf_proto *tp, unsigned long base, | |
371 | u32 handle, struct nlattr **tca, | |
2f7ef2f8 | 372 | unsigned long *arg, bool ovr) |
7d1d65cb | 373 | { |
1f947bf1 JF |
374 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
375 | struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg; | |
7d1d65cb | 376 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 377 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
378 | int ret; |
379 | ||
380 | if (tca[TCA_OPTIONS] == NULL) | |
381 | return -EINVAL; | |
382 | ||
383 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy); | |
384 | if (ret < 0) | |
385 | return ret; | |
386 | ||
7d1d65cb | 387 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 388 | if (!prog) |
7d1d65cb DB |
389 | return -ENOBUFS; |
390 | ||
5da57f42 | 391 | tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
1f947bf1 JF |
392 | |
393 | if (oldprog) { | |
394 | if (handle && oldprog->handle != handle) { | |
395 | ret = -EINVAL; | |
396 | goto errout; | |
397 | } | |
398 | } | |
399 | ||
7d1d65cb DB |
400 | if (handle == 0) |
401 | prog->handle = cls_bpf_grab_new_handle(tp, head); | |
402 | else | |
403 | prog->handle = handle; | |
404 | if (prog->handle == 0) { | |
405 | ret = -EINVAL; | |
406 | goto errout; | |
407 | } | |
408 | ||
2f7ef2f8 | 409 | ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE], ovr); |
7d1d65cb DB |
410 | if (ret < 0) |
411 | goto errout; | |
412 | ||
1f947bf1 | 413 | if (oldprog) { |
f6bfc46d | 414 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 415 | tcf_unbind_filter(tp, &oldprog->res); |
1f947bf1 JF |
416 | call_rcu(&oldprog->rcu, __cls_bpf_delete_prog); |
417 | } else { | |
418 | list_add_rcu(&prog->link, &head->plist); | |
419 | } | |
7d1d65cb DB |
420 | |
421 | *arg = (unsigned long) prog; | |
7d1d65cb DB |
422 | return 0; |
423 | errout: | |
1f947bf1 | 424 | kfree(prog); |
7d1d65cb DB |
425 | |
426 | return ret; | |
427 | } | |
428 | ||
e2e9b654 DB |
429 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
430 | struct sk_buff *skb) | |
431 | { | |
432 | struct nlattr *nla; | |
433 | ||
434 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
435 | return -EMSGSIZE; | |
436 | ||
437 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
438 | sizeof(struct sock_filter)); | |
439 | if (nla == NULL) | |
440 | return -EMSGSIZE; | |
441 | ||
442 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
448 | struct sk_buff *skb) | |
449 | { | |
450 | if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd)) | |
451 | return -EMSGSIZE; | |
452 | ||
453 | if (prog->bpf_name && | |
454 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
455 | return -EMSGSIZE; | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
832d1d5b | 460 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
7d1d65cb DB |
461 | struct sk_buff *skb, struct tcmsg *tm) |
462 | { | |
463 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh; | |
e2e9b654 | 464 | struct nlattr *nest; |
bf007d1c | 465 | u32 bpf_flags = 0; |
e2e9b654 | 466 | int ret; |
7d1d65cb DB |
467 | |
468 | if (prog == NULL) | |
469 | return skb->len; | |
470 | ||
471 | tm->tcm_handle = prog->handle; | |
472 | ||
473 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
474 | if (nest == NULL) | |
475 | goto nla_put_failure; | |
476 | ||
ef146fa4 DB |
477 | if (prog->res.classid && |
478 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 479 | goto nla_put_failure; |
7d1d65cb | 480 | |
e2e9b654 DB |
481 | if (cls_bpf_is_ebpf(prog)) |
482 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
483 | else | |
484 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
485 | if (ret) | |
7d1d65cb DB |
486 | goto nla_put_failure; |
487 | ||
5da57f42 | 488 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
489 | goto nla_put_failure; |
490 | ||
bf007d1c DB |
491 | if (prog->exts_integrated) |
492 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
493 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
494 | goto nla_put_failure; | |
495 | ||
7d1d65cb DB |
496 | nla_nest_end(skb, nest); |
497 | ||
5da57f42 | 498 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
499 | goto nla_put_failure; |
500 | ||
501 | return skb->len; | |
502 | ||
503 | nla_put_failure: | |
504 | nla_nest_cancel(skb, nest); | |
505 | return -1; | |
506 | } | |
507 | ||
508 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
509 | { | |
1f947bf1 | 510 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
511 | struct cls_bpf_prog *prog; |
512 | ||
3fe6b49e | 513 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
514 | if (arg->count < arg->skip) |
515 | goto skip; | |
516 | if (arg->fn(tp, (unsigned long) prog, arg) < 0) { | |
517 | arg->stop = 1; | |
518 | break; | |
519 | } | |
520 | skip: | |
521 | arg->count++; | |
522 | } | |
523 | } | |
524 | ||
525 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
526 | .kind = "bpf", | |
527 | .owner = THIS_MODULE, | |
528 | .classify = cls_bpf_classify, | |
529 | .init = cls_bpf_init, | |
530 | .destroy = cls_bpf_destroy, | |
531 | .get = cls_bpf_get, | |
7d1d65cb DB |
532 | .change = cls_bpf_change, |
533 | .delete = cls_bpf_delete, | |
534 | .walk = cls_bpf_walk, | |
535 | .dump = cls_bpf_dump, | |
536 | }; | |
537 | ||
538 | static int __init cls_bpf_init_mod(void) | |
539 | { | |
540 | return register_tcf_proto_ops(&cls_bpf_ops); | |
541 | } | |
542 | ||
543 | static void __exit cls_bpf_exit_mod(void) | |
544 | { | |
545 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
546 | } | |
547 | ||
548 | module_init(cls_bpf_init_mod); | |
549 | module_exit(cls_bpf_exit_mod); |