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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; |
55556dd5 | 48 | u16 bpf_num_ops; |
e2e9b654 DB |
49 | struct sock_filter *bpf_ops; |
50 | const char *bpf_name; | |
1f947bf1 JF |
51 | struct tcf_proto *tp; |
52 | struct rcu_head rcu; | |
7d1d65cb DB |
53 | }; |
54 | ||
55 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
56 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 57 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 58 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 59 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
60 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
61 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
62 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
63 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
64 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
65 | }; | |
66 | ||
045efa82 DB |
67 | static int cls_bpf_exec_opcode(int code) |
68 | { | |
69 | switch (code) { | |
70 | case TC_ACT_OK: | |
045efa82 | 71 | case TC_ACT_SHOT: |
045efa82 | 72 | case TC_ACT_STOLEN: |
e25ea21f | 73 | case TC_ACT_TRAP: |
27b29f63 | 74 | case TC_ACT_REDIRECT: |
045efa82 DB |
75 | case TC_ACT_UNSPEC: |
76 | return code; | |
77 | default: | |
78 | return TC_ACT_UNSPEC; | |
79 | } | |
80 | } | |
81 | ||
7d1d65cb DB |
82 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
83 | struct tcf_result *res) | |
84 | { | |
80dcbd12 | 85 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 86 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 87 | struct cls_bpf_prog *prog; |
54720df1 | 88 | int ret = -1; |
7d1d65cb | 89 | |
54720df1 DB |
90 | /* Needed here for accessing maps. */ |
91 | rcu_read_lock(); | |
1f947bf1 | 92 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
93 | int filter_res; |
94 | ||
045efa82 DB |
95 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
96 | ||
eadb4148 JK |
97 | if (tc_skip_sw(prog->gen_flags)) { |
98 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
99 | } else if (at_ingress) { | |
3431205e AS |
100 | /* It is safe to push/pull even if skb_shared() */ |
101 | __skb_push(skb, skb->mac_len); | |
db58ba45 | 102 | bpf_compute_data_end(skb); |
3431205e AS |
103 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
104 | __skb_pull(skb, skb->mac_len); | |
105 | } else { | |
db58ba45 | 106 | bpf_compute_data_end(skb); |
3431205e AS |
107 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
108 | } | |
7d1d65cb | 109 | |
045efa82 | 110 | if (prog->exts_integrated) { |
3a461da1 DB |
111 | res->class = 0; |
112 | res->classid = TC_H_MAJ(prog->res.classid) | | |
113 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
114 | |
115 | ret = cls_bpf_exec_opcode(filter_res); | |
116 | if (ret == TC_ACT_UNSPEC) | |
117 | continue; | |
118 | break; | |
119 | } | |
120 | ||
7d1d65cb DB |
121 | if (filter_res == 0) |
122 | continue; | |
3a461da1 DB |
123 | if (filter_res != -1) { |
124 | res->class = 0; | |
7d1d65cb | 125 | res->classid = filter_res; |
3a461da1 DB |
126 | } else { |
127 | *res = prog->res; | |
128 | } | |
7d1d65cb DB |
129 | |
130 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
131 | if (ret < 0) | |
132 | continue; | |
133 | ||
54720df1 | 134 | break; |
7d1d65cb | 135 | } |
54720df1 | 136 | rcu_read_unlock(); |
7d1d65cb | 137 | |
54720df1 | 138 | return ret; |
7d1d65cb DB |
139 | } |
140 | ||
e2e9b654 DB |
141 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
142 | { | |
143 | return !prog->bpf_ops; | |
144 | } | |
145 | ||
332ae8e2 JK |
146 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
147 | enum tc_clsbpf_command cmd) | |
148 | { | |
149 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 150 | struct tc_cls_bpf_offload cls_bpf = {}; |
5cecb6cc | 151 | int err; |
332ae8e2 | 152 | |
de4784ca JP |
153 | tc_cls_common_offload_init(&cls_bpf.common, tp); |
154 | cls_bpf.command = cmd; | |
155 | cls_bpf.exts = &prog->exts; | |
156 | cls_bpf.prog = prog->filter; | |
157 | cls_bpf.name = prog->bpf_name; | |
158 | cls_bpf.exts_integrated = prog->exts_integrated; | |
159 | cls_bpf.gen_flags = prog->gen_flags; | |
332ae8e2 | 160 | |
de4784ca | 161 | err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSBPF, &cls_bpf); |
5cecb6cc OG |
162 | if (!err && (cmd == TC_CLSBPF_ADD || cmd == TC_CLSBPF_REPLACE)) |
163 | prog->gen_flags |= TCA_CLS_FLAGS_IN_HW; | |
164 | ||
165 | return err; | |
332ae8e2 JK |
166 | } |
167 | ||
eadb4148 JK |
168 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
169 | struct cls_bpf_prog *oldprog) | |
332ae8e2 JK |
170 | { |
171 | struct net_device *dev = tp->q->dev_queue->dev; | |
172 | struct cls_bpf_prog *obj = prog; | |
173 | enum tc_clsbpf_command cmd; | |
eadb4148 JK |
174 | bool skip_sw; |
175 | int ret; | |
176 | ||
177 | skip_sw = tc_skip_sw(prog->gen_flags) || | |
178 | (oldprog && tc_skip_sw(oldprog->gen_flags)); | |
332ae8e2 JK |
179 | |
180 | if (oldprog && oldprog->offloaded) { | |
0d01d45f | 181 | if (tc_should_offload(dev, tp, prog->gen_flags)) { |
332ae8e2 | 182 | cmd = TC_CLSBPF_REPLACE; |
eadb4148 | 183 | } else if (!tc_skip_sw(prog->gen_flags)) { |
332ae8e2 JK |
184 | obj = oldprog; |
185 | cmd = TC_CLSBPF_DESTROY; | |
eadb4148 JK |
186 | } else { |
187 | return -EINVAL; | |
332ae8e2 JK |
188 | } |
189 | } else { | |
0d01d45f | 190 | if (!tc_should_offload(dev, tp, prog->gen_flags)) |
eadb4148 | 191 | return skip_sw ? -EINVAL : 0; |
332ae8e2 JK |
192 | cmd = TC_CLSBPF_ADD; |
193 | } | |
194 | ||
eadb4148 JK |
195 | ret = cls_bpf_offload_cmd(tp, obj, cmd); |
196 | if (ret) | |
197 | return skip_sw ? ret : 0; | |
332ae8e2 JK |
198 | |
199 | obj->offloaded = true; | |
200 | if (oldprog) | |
201 | oldprog->offloaded = false; | |
eadb4148 JK |
202 | |
203 | return 0; | |
332ae8e2 JK |
204 | } |
205 | ||
206 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
207 | struct cls_bpf_prog *prog) | |
208 | { | |
209 | int err; | |
210 | ||
211 | if (!prog->offloaded) | |
212 | return; | |
213 | ||
214 | err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY); | |
215 | if (err) { | |
216 | pr_err("Stopping hardware offload failed: %d\n", err); | |
217 | return; | |
218 | } | |
219 | ||
220 | prog->offloaded = false; | |
221 | } | |
222 | ||
68d64063 JK |
223 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
224 | struct cls_bpf_prog *prog) | |
225 | { | |
226 | if (!prog->offloaded) | |
227 | return; | |
228 | ||
229 | cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS); | |
230 | } | |
231 | ||
7d1d65cb DB |
232 | static int cls_bpf_init(struct tcf_proto *tp) |
233 | { | |
234 | struct cls_bpf_head *head; | |
235 | ||
236 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
237 | if (head == NULL) | |
238 | return -ENOBUFS; | |
239 | ||
1f947bf1 JF |
240 | INIT_LIST_HEAD_RCU(&head->plist); |
241 | rcu_assign_pointer(tp->root, head); | |
7d1d65cb DB |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
8d829bdb | 246 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) |
7d1d65cb | 247 | { |
18d0264f | 248 | tcf_exts_destroy(&prog->exts); |
7d1d65cb | 249 | |
e2e9b654 DB |
250 | if (cls_bpf_is_ebpf(prog)) |
251 | bpf_prog_put(prog->filter); | |
252 | else | |
253 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 254 | |
e2e9b654 | 255 | kfree(prog->bpf_name); |
7d1d65cb DB |
256 | kfree(prog->bpf_ops); |
257 | kfree(prog); | |
258 | } | |
259 | ||
8d829bdb | 260 | static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu) |
1f947bf1 | 261 | { |
8d829bdb | 262 | __cls_bpf_delete_prog(container_of(rcu, struct cls_bpf_prog, rcu)); |
1f947bf1 JF |
263 | } |
264 | ||
8d829bdb | 265 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog) |
7d1d65cb | 266 | { |
332ae8e2 | 267 | cls_bpf_stop_offload(tp, prog); |
472f5837 JP |
268 | list_del_rcu(&prog->link); |
269 | tcf_unbind_filter(tp, &prog->res); | |
8d829bdb DB |
270 | call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu); |
271 | } | |
e2e9b654 | 272 | |
763dbf63 | 273 | static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg, bool *last) |
8d829bdb | 274 | { |
763dbf63 WC |
275 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
276 | ||
8d829bdb | 277 | __cls_bpf_delete(tp, (struct cls_bpf_prog *) arg); |
763dbf63 | 278 | *last = list_empty(&head->plist); |
472f5837 | 279 | return 0; |
7d1d65cb DB |
280 | } |
281 | ||
763dbf63 | 282 | static void cls_bpf_destroy(struct tcf_proto *tp) |
7d1d65cb | 283 | { |
1f947bf1 | 284 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
285 | struct cls_bpf_prog *prog, *tmp; |
286 | ||
8d829bdb DB |
287 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
288 | __cls_bpf_delete(tp, prog); | |
7d1d65cb | 289 | |
1f947bf1 | 290 | kfree_rcu(head, rcu); |
7d1d65cb DB |
291 | } |
292 | ||
293 | static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle) | |
294 | { | |
1f947bf1 | 295 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
296 | struct cls_bpf_prog *prog; |
297 | unsigned long ret = 0UL; | |
298 | ||
3fe6b49e | 299 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
300 | if (prog->handle == handle) { |
301 | ret = (unsigned long) prog; | |
302 | break; | |
303 | } | |
304 | } | |
305 | ||
306 | return ret; | |
307 | } | |
308 | ||
045efa82 | 309 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 310 | { |
1f947bf1 | 311 | struct sock_filter *bpf_ops; |
e2e9b654 | 312 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 313 | struct bpf_prog *fp; |
33e9fcc6 | 314 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
315 | int ret; |
316 | ||
33e9fcc6 | 317 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
318 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
319 | return -EINVAL; | |
7d1d65cb | 320 | |
33e9fcc6 | 321 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
322 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
323 | return -EINVAL; | |
7913ecf6 | 324 | |
7d1d65cb | 325 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
326 | if (bpf_ops == NULL) |
327 | return -ENOMEM; | |
7d1d65cb DB |
328 | |
329 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
330 | ||
e2e9b654 DB |
331 | fprog_tmp.len = bpf_num_ops; |
332 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 333 | |
e2e9b654 DB |
334 | ret = bpf_prog_create(&fp, &fprog_tmp); |
335 | if (ret < 0) { | |
336 | kfree(bpf_ops); | |
337 | return ret; | |
338 | } | |
7d1d65cb | 339 | |
7d1d65cb | 340 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
341 | prog->bpf_num_ops = bpf_num_ops; |
342 | prog->bpf_name = NULL; | |
7d1d65cb | 343 | prog->filter = fp; |
7d1d65cb | 344 | |
e2e9b654 DB |
345 | return 0; |
346 | } | |
347 | ||
c46646d0 DB |
348 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
349 | const struct tcf_proto *tp) | |
e2e9b654 DB |
350 | { |
351 | struct bpf_prog *fp; | |
352 | char *name = NULL; | |
353 | u32 bpf_fd; | |
354 | ||
355 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
356 | ||
113214be | 357 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS); |
e2e9b654 DB |
358 | if (IS_ERR(fp)) |
359 | return PTR_ERR(fp); | |
360 | ||
e2e9b654 | 361 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 362 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
363 | if (!name) { |
364 | bpf_prog_put(fp); | |
365 | return -ENOMEM; | |
366 | } | |
367 | } | |
368 | ||
369 | prog->bpf_ops = NULL; | |
e2e9b654 | 370 | prog->bpf_name = name; |
e2e9b654 | 371 | prog->filter = fp; |
e2e9b654 | 372 | |
1f211a1b | 373 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
374 | netif_keep_dst(qdisc_dev(tp->q)); |
375 | ||
e2e9b654 DB |
376 | return 0; |
377 | } | |
378 | ||
6a725c48 JP |
379 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
380 | struct cls_bpf_prog *prog, unsigned long base, | |
381 | struct nlattr **tb, struct nlattr *est, bool ovr) | |
e2e9b654 | 382 | { |
045efa82 | 383 | bool is_bpf, is_ebpf, have_exts = false; |
0d01d45f | 384 | u32 gen_flags = 0; |
e2e9b654 DB |
385 | int ret; |
386 | ||
387 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
388 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 389 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
390 | return -EINVAL; |
391 | ||
6839da32 | 392 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr); |
e2e9b654 DB |
393 | if (ret < 0) |
394 | return ret; | |
395 | ||
045efa82 DB |
396 | if (tb[TCA_BPF_FLAGS]) { |
397 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
398 | ||
6839da32 JP |
399 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
400 | return -EINVAL; | |
045efa82 DB |
401 | |
402 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
403 | } | |
0d01d45f JK |
404 | if (tb[TCA_BPF_FLAGS_GEN]) { |
405 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
406 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
6839da32 JP |
407 | !tc_flags_valid(gen_flags)) |
408 | return -EINVAL; | |
0d01d45f | 409 | } |
045efa82 | 410 | |
045efa82 | 411 | prog->exts_integrated = have_exts; |
0d01d45f | 412 | prog->gen_flags = gen_flags; |
e2e9b654 | 413 | |
045efa82 | 414 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
c46646d0 | 415 | cls_bpf_prog_from_efd(tb, prog, tp); |
b9a24bb7 | 416 | if (ret < 0) |
6839da32 | 417 | return ret; |
e2e9b654 | 418 | |
ef146fa4 DB |
419 | if (tb[TCA_BPF_CLASSID]) { |
420 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
421 | tcf_bind_filter(tp, &prog->res, base); | |
422 | } | |
7d1d65cb | 423 | |
7d1d65cb | 424 | return 0; |
7d1d65cb DB |
425 | } |
426 | ||
427 | static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, | |
428 | struct cls_bpf_head *head) | |
429 | { | |
430 | unsigned int i = 0x80000000; | |
3f2ab135 | 431 | u32 handle; |
7d1d65cb DB |
432 | |
433 | do { | |
434 | if (++head->hgen == 0x7FFFFFFF) | |
435 | head->hgen = 1; | |
436 | } while (--i > 0 && cls_bpf_get(tp, head->hgen)); | |
3f2ab135 DB |
437 | |
438 | if (unlikely(i == 0)) { | |
7d1d65cb | 439 | pr_err("Insufficient number of handles\n"); |
3f2ab135 DB |
440 | handle = 0; |
441 | } else { | |
442 | handle = head->hgen; | |
443 | } | |
7d1d65cb | 444 | |
3f2ab135 | 445 | return handle; |
7d1d65cb DB |
446 | } |
447 | ||
448 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, | |
449 | struct tcf_proto *tp, unsigned long base, | |
450 | u32 handle, struct nlattr **tca, | |
2f7ef2f8 | 451 | unsigned long *arg, bool ovr) |
7d1d65cb | 452 | { |
1f947bf1 JF |
453 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
454 | struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg; | |
7d1d65cb | 455 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 456 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
457 | int ret; |
458 | ||
459 | if (tca[TCA_OPTIONS] == NULL) | |
460 | return -EINVAL; | |
461 | ||
fceb6435 JB |
462 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
463 | NULL); | |
7d1d65cb DB |
464 | if (ret < 0) |
465 | return ret; | |
466 | ||
7d1d65cb | 467 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 468 | if (!prog) |
7d1d65cb DB |
469 | return -ENOBUFS; |
470 | ||
b9a24bb7 WC |
471 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
472 | if (ret < 0) | |
473 | goto errout; | |
1f947bf1 JF |
474 | |
475 | if (oldprog) { | |
476 | if (handle && oldprog->handle != handle) { | |
477 | ret = -EINVAL; | |
478 | goto errout; | |
479 | } | |
480 | } | |
481 | ||
7d1d65cb DB |
482 | if (handle == 0) |
483 | prog->handle = cls_bpf_grab_new_handle(tp, head); | |
484 | else | |
485 | prog->handle = handle; | |
486 | if (prog->handle == 0) { | |
487 | ret = -EINVAL; | |
488 | goto errout; | |
489 | } | |
490 | ||
6a725c48 | 491 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr); |
7d1d65cb DB |
492 | if (ret < 0) |
493 | goto errout; | |
494 | ||
eadb4148 JK |
495 | ret = cls_bpf_offload(tp, prog, oldprog); |
496 | if (ret) { | |
8d829bdb | 497 | __cls_bpf_delete_prog(prog); |
eadb4148 JK |
498 | return ret; |
499 | } | |
332ae8e2 | 500 | |
5cecb6cc OG |
501 | if (!tc_in_hw(prog->gen_flags)) |
502 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
503 | ||
1f947bf1 | 504 | if (oldprog) { |
f6bfc46d | 505 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 506 | tcf_unbind_filter(tp, &oldprog->res); |
8d829bdb | 507 | call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu); |
1f947bf1 JF |
508 | } else { |
509 | list_add_rcu(&prog->link, &head->plist); | |
510 | } | |
7d1d65cb DB |
511 | |
512 | *arg = (unsigned long) prog; | |
7d1d65cb | 513 | return 0; |
b9a24bb7 | 514 | |
7d1d65cb | 515 | errout: |
b9a24bb7 | 516 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 517 | kfree(prog); |
7d1d65cb DB |
518 | return ret; |
519 | } | |
520 | ||
e2e9b654 DB |
521 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
522 | struct sk_buff *skb) | |
523 | { | |
524 | struct nlattr *nla; | |
525 | ||
526 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
527 | return -EMSGSIZE; | |
528 | ||
529 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
530 | sizeof(struct sock_filter)); | |
531 | if (nla == NULL) | |
532 | return -EMSGSIZE; | |
533 | ||
534 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
540 | struct sk_buff *skb) | |
541 | { | |
7bd509e3 DB |
542 | struct nlattr *nla; |
543 | ||
e2e9b654 DB |
544 | if (prog->bpf_name && |
545 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
546 | return -EMSGSIZE; | |
547 | ||
e8628307 DB |
548 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
549 | return -EMSGSIZE; | |
550 | ||
f1f7714e | 551 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
552 | if (nla == NULL) |
553 | return -EMSGSIZE; | |
554 | ||
f1f7714e | 555 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 556 | |
e2e9b654 DB |
557 | return 0; |
558 | } | |
559 | ||
832d1d5b | 560 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
7d1d65cb DB |
561 | struct sk_buff *skb, struct tcmsg *tm) |
562 | { | |
563 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh; | |
e2e9b654 | 564 | struct nlattr *nest; |
bf007d1c | 565 | u32 bpf_flags = 0; |
e2e9b654 | 566 | int ret; |
7d1d65cb DB |
567 | |
568 | if (prog == NULL) | |
569 | return skb->len; | |
570 | ||
571 | tm->tcm_handle = prog->handle; | |
572 | ||
68d64063 JK |
573 | cls_bpf_offload_update_stats(tp, prog); |
574 | ||
7d1d65cb DB |
575 | nest = nla_nest_start(skb, TCA_OPTIONS); |
576 | if (nest == NULL) | |
577 | goto nla_put_failure; | |
578 | ||
ef146fa4 DB |
579 | if (prog->res.classid && |
580 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 581 | goto nla_put_failure; |
7d1d65cb | 582 | |
e2e9b654 DB |
583 | if (cls_bpf_is_ebpf(prog)) |
584 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
585 | else | |
586 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
587 | if (ret) | |
7d1d65cb DB |
588 | goto nla_put_failure; |
589 | ||
5da57f42 | 590 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
591 | goto nla_put_failure; |
592 | ||
bf007d1c DB |
593 | if (prog->exts_integrated) |
594 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
595 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
596 | goto nla_put_failure; | |
0d01d45f JK |
597 | if (prog->gen_flags && |
598 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
599 | goto nla_put_failure; | |
bf007d1c | 600 | |
7d1d65cb DB |
601 | nla_nest_end(skb, nest); |
602 | ||
5da57f42 | 603 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
604 | goto nla_put_failure; |
605 | ||
606 | return skb->len; | |
607 | ||
608 | nla_put_failure: | |
609 | nla_nest_cancel(skb, nest); | |
610 | return -1; | |
611 | } | |
612 | ||
613 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
614 | { | |
1f947bf1 | 615 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
616 | struct cls_bpf_prog *prog; |
617 | ||
3fe6b49e | 618 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
619 | if (arg->count < arg->skip) |
620 | goto skip; | |
621 | if (arg->fn(tp, (unsigned long) prog, arg) < 0) { | |
622 | arg->stop = 1; | |
623 | break; | |
624 | } | |
625 | skip: | |
626 | arg->count++; | |
627 | } | |
628 | } | |
629 | ||
630 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
631 | .kind = "bpf", | |
632 | .owner = THIS_MODULE, | |
633 | .classify = cls_bpf_classify, | |
634 | .init = cls_bpf_init, | |
635 | .destroy = cls_bpf_destroy, | |
636 | .get = cls_bpf_get, | |
7d1d65cb DB |
637 | .change = cls_bpf_change, |
638 | .delete = cls_bpf_delete, | |
639 | .walk = cls_bpf_walk, | |
640 | .dump = cls_bpf_dump, | |
641 | }; | |
642 | ||
643 | static int __init cls_bpf_init_mod(void) | |
644 | { | |
645 | return register_tcf_proto_ops(&cls_bpf_ops); | |
646 | } | |
647 | ||
648 | static void __exit cls_bpf_exit_mod(void) | |
649 | { | |
650 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
651 | } | |
652 | ||
653 | module_init(cls_bpf_init_mod); | |
654 | module_exit(cls_bpf_exit_mod); |