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Commit | Line | Data |
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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 | 29 | #define CLS_BPF_NAME_LEN 256 |
0d01d45f | 30 | #define CLS_BPF_SUPPORTED_GEN_FLAGS \ |
eadb4148 | 31 | (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) |
e2e9b654 | 32 | |
7d1d65cb DB |
33 | struct cls_bpf_head { |
34 | struct list_head plist; | |
35 | u32 hgen; | |
1f947bf1 | 36 | struct rcu_head rcu; |
7d1d65cb DB |
37 | }; |
38 | ||
39 | struct cls_bpf_prog { | |
7ae457c1 | 40 | struct bpf_prog *filter; |
7d1d65cb | 41 | struct list_head link; |
e2e9b654 | 42 | struct tcf_result res; |
045efa82 | 43 | bool exts_integrated; |
332ae8e2 | 44 | bool offloaded; |
0d01d45f | 45 | u32 gen_flags; |
e2e9b654 | 46 | struct tcf_exts exts; |
7d1d65cb | 47 | u32 handle; |
e2e9b654 DB |
48 | union { |
49 | u32 bpf_fd; | |
50 | u16 bpf_num_ops; | |
51 | }; | |
52 | struct sock_filter *bpf_ops; | |
53 | const char *bpf_name; | |
1f947bf1 JF |
54 | struct tcf_proto *tp; |
55 | struct rcu_head rcu; | |
7d1d65cb DB |
56 | }; |
57 | ||
58 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
59 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 60 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 61 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 62 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
63 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
64 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
65 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
66 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
67 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
68 | }; | |
69 | ||
045efa82 DB |
70 | static int cls_bpf_exec_opcode(int code) |
71 | { | |
72 | switch (code) { | |
73 | case TC_ACT_OK: | |
045efa82 | 74 | case TC_ACT_SHOT: |
045efa82 | 75 | case TC_ACT_STOLEN: |
27b29f63 | 76 | case TC_ACT_REDIRECT: |
045efa82 DB |
77 | case TC_ACT_UNSPEC: |
78 | return code; | |
79 | default: | |
80 | return TC_ACT_UNSPEC; | |
81 | } | |
82 | } | |
83 | ||
7d1d65cb DB |
84 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
85 | struct tcf_result *res) | |
86 | { | |
80dcbd12 | 87 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 88 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 89 | struct cls_bpf_prog *prog; |
54720df1 | 90 | int ret = -1; |
7d1d65cb | 91 | |
54720df1 DB |
92 | /* Needed here for accessing maps. */ |
93 | rcu_read_lock(); | |
1f947bf1 | 94 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
95 | int filter_res; |
96 | ||
045efa82 DB |
97 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
98 | ||
eadb4148 JK |
99 | if (tc_skip_sw(prog->gen_flags)) { |
100 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
101 | } else if (at_ingress) { | |
3431205e AS |
102 | /* It is safe to push/pull even if skb_shared() */ |
103 | __skb_push(skb, skb->mac_len); | |
db58ba45 | 104 | bpf_compute_data_end(skb); |
3431205e AS |
105 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
106 | __skb_pull(skb, skb->mac_len); | |
107 | } else { | |
db58ba45 | 108 | bpf_compute_data_end(skb); |
3431205e AS |
109 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
110 | } | |
7d1d65cb | 111 | |
045efa82 | 112 | if (prog->exts_integrated) { |
3a461da1 DB |
113 | res->class = 0; |
114 | res->classid = TC_H_MAJ(prog->res.classid) | | |
115 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
116 | |
117 | ret = cls_bpf_exec_opcode(filter_res); | |
118 | if (ret == TC_ACT_UNSPEC) | |
119 | continue; | |
120 | break; | |
121 | } | |
122 | ||
7d1d65cb DB |
123 | if (filter_res == 0) |
124 | continue; | |
3a461da1 DB |
125 | if (filter_res != -1) { |
126 | res->class = 0; | |
7d1d65cb | 127 | res->classid = filter_res; |
3a461da1 DB |
128 | } else { |
129 | *res = prog->res; | |
130 | } | |
7d1d65cb DB |
131 | |
132 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
133 | if (ret < 0) | |
134 | continue; | |
135 | ||
54720df1 | 136 | break; |
7d1d65cb | 137 | } |
54720df1 | 138 | rcu_read_unlock(); |
7d1d65cb | 139 | |
54720df1 | 140 | return ret; |
7d1d65cb DB |
141 | } |
142 | ||
e2e9b654 DB |
143 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
144 | { | |
145 | return !prog->bpf_ops; | |
146 | } | |
147 | ||
332ae8e2 JK |
148 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
149 | enum tc_clsbpf_command cmd) | |
150 | { | |
151 | struct net_device *dev = tp->q->dev_queue->dev; | |
152 | struct tc_cls_bpf_offload bpf_offload = {}; | |
153 | struct tc_to_netdev offload; | |
154 | ||
155 | offload.type = TC_SETUP_CLSBPF; | |
156 | offload.cls_bpf = &bpf_offload; | |
157 | ||
158 | bpf_offload.command = cmd; | |
159 | bpf_offload.exts = &prog->exts; | |
160 | bpf_offload.prog = prog->filter; | |
161 | bpf_offload.name = prog->bpf_name; | |
162 | bpf_offload.exts_integrated = prog->exts_integrated; | |
0d01d45f | 163 | bpf_offload.gen_flags = prog->gen_flags; |
332ae8e2 JK |
164 | |
165 | return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
166 | tp->protocol, &offload); | |
167 | } | |
168 | ||
eadb4148 JK |
169 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
170 | struct cls_bpf_prog *oldprog) | |
332ae8e2 JK |
171 | { |
172 | struct net_device *dev = tp->q->dev_queue->dev; | |
173 | struct cls_bpf_prog *obj = prog; | |
174 | enum tc_clsbpf_command cmd; | |
eadb4148 JK |
175 | bool skip_sw; |
176 | int ret; | |
177 | ||
178 | skip_sw = tc_skip_sw(prog->gen_flags) || | |
179 | (oldprog && tc_skip_sw(oldprog->gen_flags)); | |
332ae8e2 JK |
180 | |
181 | if (oldprog && oldprog->offloaded) { | |
0d01d45f | 182 | if (tc_should_offload(dev, tp, prog->gen_flags)) { |
332ae8e2 | 183 | cmd = TC_CLSBPF_REPLACE; |
eadb4148 | 184 | } else if (!tc_skip_sw(prog->gen_flags)) { |
332ae8e2 JK |
185 | obj = oldprog; |
186 | cmd = TC_CLSBPF_DESTROY; | |
eadb4148 JK |
187 | } else { |
188 | return -EINVAL; | |
332ae8e2 JK |
189 | } |
190 | } else { | |
0d01d45f | 191 | if (!tc_should_offload(dev, tp, prog->gen_flags)) |
eadb4148 | 192 | return skip_sw ? -EINVAL : 0; |
332ae8e2 JK |
193 | cmd = TC_CLSBPF_ADD; |
194 | } | |
195 | ||
eadb4148 JK |
196 | ret = cls_bpf_offload_cmd(tp, obj, cmd); |
197 | if (ret) | |
198 | return skip_sw ? ret : 0; | |
332ae8e2 JK |
199 | |
200 | obj->offloaded = true; | |
201 | if (oldprog) | |
202 | oldprog->offloaded = false; | |
eadb4148 JK |
203 | |
204 | return 0; | |
332ae8e2 JK |
205 | } |
206 | ||
207 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
208 | struct cls_bpf_prog *prog) | |
209 | { | |
210 | int err; | |
211 | ||
212 | if (!prog->offloaded) | |
213 | return; | |
214 | ||
215 | err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY); | |
216 | if (err) { | |
217 | pr_err("Stopping hardware offload failed: %d\n", err); | |
218 | return; | |
219 | } | |
220 | ||
221 | prog->offloaded = false; | |
222 | } | |
223 | ||
68d64063 JK |
224 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
225 | struct cls_bpf_prog *prog) | |
226 | { | |
227 | if (!prog->offloaded) | |
228 | return; | |
229 | ||
230 | cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS); | |
231 | } | |
232 | ||
7d1d65cb DB |
233 | static int cls_bpf_init(struct tcf_proto *tp) |
234 | { | |
235 | struct cls_bpf_head *head; | |
236 | ||
237 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
238 | if (head == NULL) | |
239 | return -ENOBUFS; | |
240 | ||
1f947bf1 JF |
241 | INIT_LIST_HEAD_RCU(&head->plist); |
242 | rcu_assign_pointer(tp->root, head); | |
7d1d65cb DB |
243 | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog) | |
248 | { | |
18d0264f | 249 | tcf_exts_destroy(&prog->exts); |
7d1d65cb | 250 | |
e2e9b654 DB |
251 | if (cls_bpf_is_ebpf(prog)) |
252 | bpf_prog_put(prog->filter); | |
253 | else | |
254 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 255 | |
e2e9b654 | 256 | kfree(prog->bpf_name); |
7d1d65cb DB |
257 | kfree(prog->bpf_ops); |
258 | kfree(prog); | |
259 | } | |
260 | ||
1f947bf1 JF |
261 | static void __cls_bpf_delete_prog(struct rcu_head *rcu) |
262 | { | |
263 | struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu); | |
264 | ||
265 | cls_bpf_delete_prog(prog->tp, prog); | |
266 | } | |
267 | ||
7d1d65cb DB |
268 | static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg) |
269 | { | |
472f5837 | 270 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg; |
7d1d65cb | 271 | |
332ae8e2 | 272 | cls_bpf_stop_offload(tp, prog); |
472f5837 JP |
273 | list_del_rcu(&prog->link); |
274 | tcf_unbind_filter(tp, &prog->res); | |
275 | call_rcu(&prog->rcu, __cls_bpf_delete_prog); | |
e2e9b654 | 276 | |
472f5837 | 277 | return 0; |
7d1d65cb DB |
278 | } |
279 | ||
1e052be6 | 280 | static bool cls_bpf_destroy(struct tcf_proto *tp, bool force) |
7d1d65cb | 281 | { |
1f947bf1 | 282 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
283 | struct cls_bpf_prog *prog, *tmp; |
284 | ||
1e052be6 CW |
285 | if (!force && !list_empty(&head->plist)) |
286 | return false; | |
287 | ||
7d1d65cb | 288 | list_for_each_entry_safe(prog, tmp, &head->plist, link) { |
332ae8e2 | 289 | cls_bpf_stop_offload(tp, prog); |
1f947bf1 | 290 | list_del_rcu(&prog->link); |
18cdb37e | 291 | tcf_unbind_filter(tp, &prog->res); |
1f947bf1 | 292 | call_rcu(&prog->rcu, __cls_bpf_delete_prog); |
7d1d65cb DB |
293 | } |
294 | ||
1f947bf1 JF |
295 | RCU_INIT_POINTER(tp->root, NULL); |
296 | kfree_rcu(head, rcu); | |
1e052be6 | 297 | return true; |
7d1d65cb DB |
298 | } |
299 | ||
300 | static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle) | |
301 | { | |
1f947bf1 | 302 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
303 | struct cls_bpf_prog *prog; |
304 | unsigned long ret = 0UL; | |
305 | ||
306 | if (head == NULL) | |
307 | return 0UL; | |
308 | ||
3fe6b49e | 309 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
310 | if (prog->handle == handle) { |
311 | ret = (unsigned long) prog; | |
312 | break; | |
313 | } | |
314 | } | |
315 | ||
316 | return ret; | |
317 | } | |
318 | ||
045efa82 | 319 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 320 | { |
1f947bf1 | 321 | struct sock_filter *bpf_ops; |
e2e9b654 | 322 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 323 | struct bpf_prog *fp; |
33e9fcc6 | 324 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
325 | int ret; |
326 | ||
33e9fcc6 | 327 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
328 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
329 | return -EINVAL; | |
7d1d65cb | 330 | |
33e9fcc6 | 331 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
332 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
333 | return -EINVAL; | |
7913ecf6 | 334 | |
7d1d65cb | 335 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
336 | if (bpf_ops == NULL) |
337 | return -ENOMEM; | |
7d1d65cb DB |
338 | |
339 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
340 | ||
e2e9b654 DB |
341 | fprog_tmp.len = bpf_num_ops; |
342 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 343 | |
e2e9b654 DB |
344 | ret = bpf_prog_create(&fp, &fprog_tmp); |
345 | if (ret < 0) { | |
346 | kfree(bpf_ops); | |
347 | return ret; | |
348 | } | |
7d1d65cb | 349 | |
7d1d65cb | 350 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
351 | prog->bpf_num_ops = bpf_num_ops; |
352 | prog->bpf_name = NULL; | |
7d1d65cb | 353 | prog->filter = fp; |
7d1d65cb | 354 | |
e2e9b654 DB |
355 | return 0; |
356 | } | |
357 | ||
c46646d0 DB |
358 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
359 | const struct tcf_proto *tp) | |
e2e9b654 DB |
360 | { |
361 | struct bpf_prog *fp; | |
362 | char *name = NULL; | |
363 | u32 bpf_fd; | |
364 | ||
365 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
366 | ||
113214be | 367 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS); |
e2e9b654 DB |
368 | if (IS_ERR(fp)) |
369 | return PTR_ERR(fp); | |
370 | ||
e2e9b654 | 371 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 372 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
373 | if (!name) { |
374 | bpf_prog_put(fp); | |
375 | return -ENOMEM; | |
376 | } | |
377 | } | |
378 | ||
379 | prog->bpf_ops = NULL; | |
380 | prog->bpf_fd = bpf_fd; | |
381 | prog->bpf_name = name; | |
e2e9b654 | 382 | prog->filter = fp; |
e2e9b654 | 383 | |
1f211a1b | 384 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
385 | netif_keep_dst(qdisc_dev(tp->q)); |
386 | ||
e2e9b654 DB |
387 | return 0; |
388 | } | |
389 | ||
390 | static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, | |
391 | struct cls_bpf_prog *prog, | |
392 | unsigned long base, struct nlattr **tb, | |
393 | struct nlattr *est, bool ovr) | |
394 | { | |
045efa82 | 395 | bool is_bpf, is_ebpf, have_exts = false; |
e2e9b654 | 396 | struct tcf_exts exts; |
0d01d45f | 397 | u32 gen_flags = 0; |
e2e9b654 DB |
398 | int ret; |
399 | ||
400 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
401 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 402 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
403 | return -EINVAL; |
404 | ||
b9a24bb7 | 405 | ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
e2e9b654 DB |
406 | if (ret < 0) |
407 | return ret; | |
b9a24bb7 WC |
408 | ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr); |
409 | if (ret < 0) | |
410 | goto errout; | |
e2e9b654 | 411 | |
045efa82 DB |
412 | if (tb[TCA_BPF_FLAGS]) { |
413 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
414 | ||
415 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { | |
b9a24bb7 WC |
416 | ret = -EINVAL; |
417 | goto errout; | |
045efa82 DB |
418 | } |
419 | ||
420 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
421 | } | |
0d01d45f JK |
422 | if (tb[TCA_BPF_FLAGS_GEN]) { |
423 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
424 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
425 | !tc_flags_valid(gen_flags)) { | |
426 | ret = -EINVAL; | |
427 | goto errout; | |
428 | } | |
429 | } | |
045efa82 | 430 | |
045efa82 | 431 | prog->exts_integrated = have_exts; |
0d01d45f | 432 | prog->gen_flags = gen_flags; |
e2e9b654 | 433 | |
045efa82 | 434 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
c46646d0 | 435 | cls_bpf_prog_from_efd(tb, prog, tp); |
b9a24bb7 WC |
436 | if (ret < 0) |
437 | goto errout; | |
e2e9b654 | 438 | |
ef146fa4 DB |
439 | if (tb[TCA_BPF_CLASSID]) { |
440 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
441 | tcf_bind_filter(tp, &prog->res, base); | |
442 | } | |
7d1d65cb | 443 | |
ef146fa4 | 444 | tcf_exts_change(tp, &prog->exts, &exts); |
7d1d65cb | 445 | return 0; |
b9a24bb7 WC |
446 | |
447 | errout: | |
448 | tcf_exts_destroy(&exts); | |
449 | return ret; | |
7d1d65cb DB |
450 | } |
451 | ||
452 | static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, | |
453 | struct cls_bpf_head *head) | |
454 | { | |
455 | unsigned int i = 0x80000000; | |
3f2ab135 | 456 | u32 handle; |
7d1d65cb DB |
457 | |
458 | do { | |
459 | if (++head->hgen == 0x7FFFFFFF) | |
460 | head->hgen = 1; | |
461 | } while (--i > 0 && cls_bpf_get(tp, head->hgen)); | |
3f2ab135 DB |
462 | |
463 | if (unlikely(i == 0)) { | |
7d1d65cb | 464 | pr_err("Insufficient number of handles\n"); |
3f2ab135 DB |
465 | handle = 0; |
466 | } else { | |
467 | handle = head->hgen; | |
468 | } | |
7d1d65cb | 469 | |
3f2ab135 | 470 | return handle; |
7d1d65cb DB |
471 | } |
472 | ||
473 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, | |
474 | struct tcf_proto *tp, unsigned long base, | |
475 | u32 handle, struct nlattr **tca, | |
2f7ef2f8 | 476 | unsigned long *arg, bool ovr) |
7d1d65cb | 477 | { |
1f947bf1 JF |
478 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
479 | struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg; | |
7d1d65cb | 480 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 481 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
482 | int ret; |
483 | ||
484 | if (tca[TCA_OPTIONS] == NULL) | |
485 | return -EINVAL; | |
486 | ||
487 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy); | |
488 | if (ret < 0) | |
489 | return ret; | |
490 | ||
7d1d65cb | 491 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 492 | if (!prog) |
7d1d65cb DB |
493 | return -ENOBUFS; |
494 | ||
b9a24bb7 WC |
495 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
496 | if (ret < 0) | |
497 | goto errout; | |
1f947bf1 JF |
498 | |
499 | if (oldprog) { | |
500 | if (handle && oldprog->handle != handle) { | |
501 | ret = -EINVAL; | |
502 | goto errout; | |
503 | } | |
504 | } | |
505 | ||
7d1d65cb DB |
506 | if (handle == 0) |
507 | prog->handle = cls_bpf_grab_new_handle(tp, head); | |
508 | else | |
509 | prog->handle = handle; | |
510 | if (prog->handle == 0) { | |
511 | ret = -EINVAL; | |
512 | goto errout; | |
513 | } | |
514 | ||
5a7a5555 JHS |
515 | ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE], |
516 | ovr); | |
7d1d65cb DB |
517 | if (ret < 0) |
518 | goto errout; | |
519 | ||
eadb4148 JK |
520 | ret = cls_bpf_offload(tp, prog, oldprog); |
521 | if (ret) { | |
522 | cls_bpf_delete_prog(tp, prog); | |
523 | return ret; | |
524 | } | |
332ae8e2 | 525 | |
1f947bf1 | 526 | if (oldprog) { |
f6bfc46d | 527 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 528 | tcf_unbind_filter(tp, &oldprog->res); |
1f947bf1 JF |
529 | call_rcu(&oldprog->rcu, __cls_bpf_delete_prog); |
530 | } else { | |
531 | list_add_rcu(&prog->link, &head->plist); | |
532 | } | |
7d1d65cb DB |
533 | |
534 | *arg = (unsigned long) prog; | |
7d1d65cb | 535 | return 0; |
b9a24bb7 | 536 | |
7d1d65cb | 537 | errout: |
b9a24bb7 | 538 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 539 | kfree(prog); |
7d1d65cb DB |
540 | return ret; |
541 | } | |
542 | ||
e2e9b654 DB |
543 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
544 | struct sk_buff *skb) | |
545 | { | |
546 | struct nlattr *nla; | |
547 | ||
548 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
549 | return -EMSGSIZE; | |
550 | ||
551 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
552 | sizeof(struct sock_filter)); | |
553 | if (nla == NULL) | |
554 | return -EMSGSIZE; | |
555 | ||
556 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
561 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
562 | struct sk_buff *skb) | |
563 | { | |
564 | if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd)) | |
565 | return -EMSGSIZE; | |
566 | ||
567 | if (prog->bpf_name && | |
568 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
569 | return -EMSGSIZE; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
832d1d5b | 574 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
7d1d65cb DB |
575 | struct sk_buff *skb, struct tcmsg *tm) |
576 | { | |
577 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh; | |
e2e9b654 | 578 | struct nlattr *nest; |
bf007d1c | 579 | u32 bpf_flags = 0; |
e2e9b654 | 580 | int ret; |
7d1d65cb DB |
581 | |
582 | if (prog == NULL) | |
583 | return skb->len; | |
584 | ||
585 | tm->tcm_handle = prog->handle; | |
586 | ||
68d64063 JK |
587 | cls_bpf_offload_update_stats(tp, prog); |
588 | ||
7d1d65cb DB |
589 | nest = nla_nest_start(skb, TCA_OPTIONS); |
590 | if (nest == NULL) | |
591 | goto nla_put_failure; | |
592 | ||
ef146fa4 DB |
593 | if (prog->res.classid && |
594 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 595 | goto nla_put_failure; |
7d1d65cb | 596 | |
e2e9b654 DB |
597 | if (cls_bpf_is_ebpf(prog)) |
598 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
599 | else | |
600 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
601 | if (ret) | |
7d1d65cb DB |
602 | goto nla_put_failure; |
603 | ||
5da57f42 | 604 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
605 | goto nla_put_failure; |
606 | ||
bf007d1c DB |
607 | if (prog->exts_integrated) |
608 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
609 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
610 | goto nla_put_failure; | |
0d01d45f JK |
611 | if (prog->gen_flags && |
612 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
613 | goto nla_put_failure; | |
bf007d1c | 614 | |
7d1d65cb DB |
615 | nla_nest_end(skb, nest); |
616 | ||
5da57f42 | 617 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
618 | goto nla_put_failure; |
619 | ||
620 | return skb->len; | |
621 | ||
622 | nla_put_failure: | |
623 | nla_nest_cancel(skb, nest); | |
624 | return -1; | |
625 | } | |
626 | ||
627 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
628 | { | |
1f947bf1 | 629 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
630 | struct cls_bpf_prog *prog; |
631 | ||
3fe6b49e | 632 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
633 | if (arg->count < arg->skip) |
634 | goto skip; | |
635 | if (arg->fn(tp, (unsigned long) prog, arg) < 0) { | |
636 | arg->stop = 1; | |
637 | break; | |
638 | } | |
639 | skip: | |
640 | arg->count++; | |
641 | } | |
642 | } | |
643 | ||
644 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
645 | .kind = "bpf", | |
646 | .owner = THIS_MODULE, | |
647 | .classify = cls_bpf_classify, | |
648 | .init = cls_bpf_init, | |
649 | .destroy = cls_bpf_destroy, | |
650 | .get = cls_bpf_get, | |
7d1d65cb DB |
651 | .change = cls_bpf_change, |
652 | .delete = cls_bpf_delete, | |
653 | .walk = cls_bpf_walk, | |
654 | .dump = cls_bpf_dump, | |
655 | }; | |
656 | ||
657 | static int __init cls_bpf_init_mod(void) | |
658 | { | |
659 | return register_tcf_proto_ops(&cls_bpf_ops); | |
660 | } | |
661 | ||
662 | static void __exit cls_bpf_exit_mod(void) | |
663 | { | |
664 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
665 | } | |
666 | ||
667 | module_init(cls_bpf_init_mod); | |
668 | module_exit(cls_bpf_exit_mod); |