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 | 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); | |
6aaae2b6 | 102 | bpf_compute_data_pointers(skb); |
3431205e AS |
103 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
104 | __skb_pull(skb, skb->mac_len); | |
105 | } else { | |
6aaae2b6 | 106 | bpf_compute_data_pointers(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) { | |
7b06e8ae | 181 | if (tc_should_offload(dev, 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 { | |
7b06e8ae | 190 | if (!tc_should_offload(dev, 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 | |
8113c095 | 273 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last) |
8d829bdb | 274 | { |
763dbf63 WC |
275 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
276 | ||
8113c095 | 277 | __cls_bpf_delete(tp, 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 | ||
8113c095 | 293 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
7d1d65cb | 294 | { |
1f947bf1 | 295 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb | 296 | struct cls_bpf_prog *prog; |
7d1d65cb | 297 | |
3fe6b49e | 298 | list_for_each_entry(prog, &head->plist, link) { |
8113c095 WC |
299 | if (prog->handle == handle) |
300 | return prog; | |
7d1d65cb DB |
301 | } |
302 | ||
8113c095 | 303 | return NULL; |
7d1d65cb DB |
304 | } |
305 | ||
045efa82 | 306 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 307 | { |
1f947bf1 | 308 | struct sock_filter *bpf_ops; |
e2e9b654 | 309 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 310 | struct bpf_prog *fp; |
33e9fcc6 | 311 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
312 | int ret; |
313 | ||
33e9fcc6 | 314 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
315 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
316 | return -EINVAL; | |
7d1d65cb | 317 | |
33e9fcc6 | 318 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
319 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
320 | return -EINVAL; | |
7913ecf6 | 321 | |
7d1d65cb | 322 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
323 | if (bpf_ops == NULL) |
324 | return -ENOMEM; | |
7d1d65cb DB |
325 | |
326 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
327 | ||
e2e9b654 DB |
328 | fprog_tmp.len = bpf_num_ops; |
329 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 330 | |
e2e9b654 DB |
331 | ret = bpf_prog_create(&fp, &fprog_tmp); |
332 | if (ret < 0) { | |
333 | kfree(bpf_ops); | |
334 | return ret; | |
335 | } | |
7d1d65cb | 336 | |
7d1d65cb | 337 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
338 | prog->bpf_num_ops = bpf_num_ops; |
339 | prog->bpf_name = NULL; | |
7d1d65cb | 340 | prog->filter = fp; |
7d1d65cb | 341 | |
e2e9b654 DB |
342 | return 0; |
343 | } | |
344 | ||
c46646d0 DB |
345 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
346 | const struct tcf_proto *tp) | |
e2e9b654 DB |
347 | { |
348 | struct bpf_prog *fp; | |
349 | char *name = NULL; | |
350 | u32 bpf_fd; | |
351 | ||
352 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
353 | ||
113214be | 354 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS); |
e2e9b654 DB |
355 | if (IS_ERR(fp)) |
356 | return PTR_ERR(fp); | |
357 | ||
e2e9b654 | 358 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 359 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
360 | if (!name) { |
361 | bpf_prog_put(fp); | |
362 | return -ENOMEM; | |
363 | } | |
364 | } | |
365 | ||
366 | prog->bpf_ops = NULL; | |
e2e9b654 | 367 | prog->bpf_name = name; |
e2e9b654 | 368 | prog->filter = fp; |
e2e9b654 | 369 | |
1f211a1b | 370 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
371 | netif_keep_dst(qdisc_dev(tp->q)); |
372 | ||
e2e9b654 DB |
373 | return 0; |
374 | } | |
375 | ||
6a725c48 JP |
376 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
377 | struct cls_bpf_prog *prog, unsigned long base, | |
378 | struct nlattr **tb, struct nlattr *est, bool ovr) | |
e2e9b654 | 379 | { |
045efa82 | 380 | bool is_bpf, is_ebpf, have_exts = false; |
0d01d45f | 381 | u32 gen_flags = 0; |
e2e9b654 DB |
382 | int ret; |
383 | ||
384 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
385 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 386 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
387 | return -EINVAL; |
388 | ||
6839da32 | 389 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr); |
e2e9b654 DB |
390 | if (ret < 0) |
391 | return ret; | |
392 | ||
045efa82 DB |
393 | if (tb[TCA_BPF_FLAGS]) { |
394 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
395 | ||
6839da32 JP |
396 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
397 | return -EINVAL; | |
045efa82 DB |
398 | |
399 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
400 | } | |
0d01d45f JK |
401 | if (tb[TCA_BPF_FLAGS_GEN]) { |
402 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
403 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
6839da32 JP |
404 | !tc_flags_valid(gen_flags)) |
405 | return -EINVAL; | |
0d01d45f | 406 | } |
045efa82 | 407 | |
045efa82 | 408 | prog->exts_integrated = have_exts; |
0d01d45f | 409 | prog->gen_flags = gen_flags; |
e2e9b654 | 410 | |
045efa82 | 411 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
c46646d0 | 412 | cls_bpf_prog_from_efd(tb, prog, tp); |
b9a24bb7 | 413 | if (ret < 0) |
6839da32 | 414 | return ret; |
e2e9b654 | 415 | |
ef146fa4 DB |
416 | if (tb[TCA_BPF_CLASSID]) { |
417 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
418 | tcf_bind_filter(tp, &prog->res, base); | |
419 | } | |
7d1d65cb | 420 | |
7d1d65cb | 421 | return 0; |
7d1d65cb DB |
422 | } |
423 | ||
424 | static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, | |
425 | struct cls_bpf_head *head) | |
426 | { | |
427 | unsigned int i = 0x80000000; | |
3f2ab135 | 428 | u32 handle; |
7d1d65cb DB |
429 | |
430 | do { | |
431 | if (++head->hgen == 0x7FFFFFFF) | |
432 | head->hgen = 1; | |
433 | } while (--i > 0 && cls_bpf_get(tp, head->hgen)); | |
3f2ab135 DB |
434 | |
435 | if (unlikely(i == 0)) { | |
7d1d65cb | 436 | pr_err("Insufficient number of handles\n"); |
3f2ab135 DB |
437 | handle = 0; |
438 | } else { | |
439 | handle = head->hgen; | |
440 | } | |
7d1d65cb | 441 | |
3f2ab135 | 442 | return handle; |
7d1d65cb DB |
443 | } |
444 | ||
445 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, | |
446 | struct tcf_proto *tp, unsigned long base, | |
447 | u32 handle, struct nlattr **tca, | |
8113c095 | 448 | void **arg, bool ovr) |
7d1d65cb | 449 | { |
1f947bf1 | 450 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
8113c095 | 451 | struct cls_bpf_prog *oldprog = *arg; |
7d1d65cb | 452 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 453 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
454 | int ret; |
455 | ||
456 | if (tca[TCA_OPTIONS] == NULL) | |
457 | return -EINVAL; | |
458 | ||
fceb6435 JB |
459 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
460 | NULL); | |
7d1d65cb DB |
461 | if (ret < 0) |
462 | return ret; | |
463 | ||
7d1d65cb | 464 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 465 | if (!prog) |
7d1d65cb DB |
466 | return -ENOBUFS; |
467 | ||
b9a24bb7 WC |
468 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
469 | if (ret < 0) | |
470 | goto errout; | |
1f947bf1 JF |
471 | |
472 | if (oldprog) { | |
473 | if (handle && oldprog->handle != handle) { | |
474 | ret = -EINVAL; | |
475 | goto errout; | |
476 | } | |
477 | } | |
478 | ||
7d1d65cb DB |
479 | if (handle == 0) |
480 | prog->handle = cls_bpf_grab_new_handle(tp, head); | |
481 | else | |
482 | prog->handle = handle; | |
483 | if (prog->handle == 0) { | |
484 | ret = -EINVAL; | |
485 | goto errout; | |
486 | } | |
487 | ||
6a725c48 | 488 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr); |
7d1d65cb DB |
489 | if (ret < 0) |
490 | goto errout; | |
491 | ||
eadb4148 JK |
492 | ret = cls_bpf_offload(tp, prog, oldprog); |
493 | if (ret) { | |
8d829bdb | 494 | __cls_bpf_delete_prog(prog); |
eadb4148 JK |
495 | return ret; |
496 | } | |
332ae8e2 | 497 | |
5cecb6cc OG |
498 | if (!tc_in_hw(prog->gen_flags)) |
499 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
500 | ||
1f947bf1 | 501 | if (oldprog) { |
f6bfc46d | 502 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 503 | tcf_unbind_filter(tp, &oldprog->res); |
8d829bdb | 504 | call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu); |
1f947bf1 JF |
505 | } else { |
506 | list_add_rcu(&prog->link, &head->plist); | |
507 | } | |
7d1d65cb | 508 | |
8113c095 | 509 | *arg = prog; |
7d1d65cb | 510 | return 0; |
b9a24bb7 | 511 | |
7d1d65cb | 512 | errout: |
b9a24bb7 | 513 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 514 | kfree(prog); |
7d1d65cb DB |
515 | return ret; |
516 | } | |
517 | ||
e2e9b654 DB |
518 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
519 | struct sk_buff *skb) | |
520 | { | |
521 | struct nlattr *nla; | |
522 | ||
523 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
524 | return -EMSGSIZE; | |
525 | ||
526 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
527 | sizeof(struct sock_filter)); | |
528 | if (nla == NULL) | |
529 | return -EMSGSIZE; | |
530 | ||
531 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
537 | struct sk_buff *skb) | |
538 | { | |
7bd509e3 DB |
539 | struct nlattr *nla; |
540 | ||
e2e9b654 DB |
541 | if (prog->bpf_name && |
542 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
543 | return -EMSGSIZE; | |
544 | ||
e8628307 DB |
545 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
546 | return -EMSGSIZE; | |
547 | ||
f1f7714e | 548 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
549 | if (nla == NULL) |
550 | return -EMSGSIZE; | |
551 | ||
f1f7714e | 552 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 553 | |
e2e9b654 DB |
554 | return 0; |
555 | } | |
556 | ||
8113c095 | 557 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
7d1d65cb DB |
558 | struct sk_buff *skb, struct tcmsg *tm) |
559 | { | |
8113c095 | 560 | struct cls_bpf_prog *prog = fh; |
e2e9b654 | 561 | struct nlattr *nest; |
bf007d1c | 562 | u32 bpf_flags = 0; |
e2e9b654 | 563 | int ret; |
7d1d65cb DB |
564 | |
565 | if (prog == NULL) | |
566 | return skb->len; | |
567 | ||
568 | tm->tcm_handle = prog->handle; | |
569 | ||
68d64063 JK |
570 | cls_bpf_offload_update_stats(tp, prog); |
571 | ||
7d1d65cb DB |
572 | nest = nla_nest_start(skb, TCA_OPTIONS); |
573 | if (nest == NULL) | |
574 | goto nla_put_failure; | |
575 | ||
ef146fa4 DB |
576 | if (prog->res.classid && |
577 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 578 | goto nla_put_failure; |
7d1d65cb | 579 | |
e2e9b654 DB |
580 | if (cls_bpf_is_ebpf(prog)) |
581 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
582 | else | |
583 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
584 | if (ret) | |
7d1d65cb DB |
585 | goto nla_put_failure; |
586 | ||
5da57f42 | 587 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
588 | goto nla_put_failure; |
589 | ||
bf007d1c DB |
590 | if (prog->exts_integrated) |
591 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
592 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
593 | goto nla_put_failure; | |
0d01d45f JK |
594 | if (prog->gen_flags && |
595 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
596 | goto nla_put_failure; | |
bf007d1c | 597 | |
7d1d65cb DB |
598 | nla_nest_end(skb, nest); |
599 | ||
5da57f42 | 600 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
601 | goto nla_put_failure; |
602 | ||
603 | return skb->len; | |
604 | ||
605 | nla_put_failure: | |
606 | nla_nest_cancel(skb, nest); | |
607 | return -1; | |
608 | } | |
609 | ||
07d79fc7 CW |
610 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) |
611 | { | |
612 | struct cls_bpf_prog *prog = fh; | |
613 | ||
614 | if (prog && prog->res.classid == classid) | |
615 | prog->res.class = cl; | |
616 | } | |
617 | ||
7d1d65cb DB |
618 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
619 | { | |
1f947bf1 | 620 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
621 | struct cls_bpf_prog *prog; |
622 | ||
3fe6b49e | 623 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
624 | if (arg->count < arg->skip) |
625 | goto skip; | |
8113c095 | 626 | if (arg->fn(tp, prog, arg) < 0) { |
7d1d65cb DB |
627 | arg->stop = 1; |
628 | break; | |
629 | } | |
630 | skip: | |
631 | arg->count++; | |
632 | } | |
633 | } | |
634 | ||
635 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
636 | .kind = "bpf", | |
637 | .owner = THIS_MODULE, | |
638 | .classify = cls_bpf_classify, | |
639 | .init = cls_bpf_init, | |
640 | .destroy = cls_bpf_destroy, | |
641 | .get = cls_bpf_get, | |
7d1d65cb DB |
642 | .change = cls_bpf_change, |
643 | .delete = cls_bpf_delete, | |
644 | .walk = cls_bpf_walk, | |
645 | .dump = cls_bpf_dump, | |
07d79fc7 | 646 | .bind_class = cls_bpf_bind_class, |
7d1d65cb DB |
647 | }; |
648 | ||
649 | static int __init cls_bpf_init_mod(void) | |
650 | { | |
651 | return register_tcf_proto_ops(&cls_bpf_ops); | |
652 | } | |
653 | ||
654 | static void __exit cls_bpf_exit_mod(void) | |
655 | { | |
656 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
657 | } | |
658 | ||
659 | module_init(cls_bpf_init_mod); | |
660 | module_exit(cls_bpf_exit_mod); |