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