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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: |
27b29f63 | 73 | case TC_ACT_REDIRECT: |
045efa82 DB |
74 | case TC_ACT_UNSPEC: |
75 | return code; | |
76 | default: | |
77 | return TC_ACT_UNSPEC; | |
78 | } | |
79 | } | |
80 | ||
7d1d65cb DB |
81 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
82 | struct tcf_result *res) | |
83 | { | |
80dcbd12 | 84 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 85 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 86 | struct cls_bpf_prog *prog; |
54720df1 | 87 | int ret = -1; |
7d1d65cb | 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 | ||
eadb4148 JK |
96 | if (tc_skip_sw(prog->gen_flags)) { |
97 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
98 | } else if (at_ingress) { | |
3431205e AS |
99 | /* It is safe to push/pull even if skb_shared() */ |
100 | __skb_push(skb, skb->mac_len); | |
db58ba45 | 101 | bpf_compute_data_end(skb); |
3431205e AS |
102 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
103 | __skb_pull(skb, skb->mac_len); | |
104 | } else { | |
db58ba45 | 105 | bpf_compute_data_end(skb); |
3431205e AS |
106 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
107 | } | |
7d1d65cb | 108 | |
045efa82 | 109 | if (prog->exts_integrated) { |
3a461da1 DB |
110 | res->class = 0; |
111 | res->classid = TC_H_MAJ(prog->res.classid) | | |
112 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
113 | |
114 | ret = cls_bpf_exec_opcode(filter_res); | |
115 | if (ret == TC_ACT_UNSPEC) | |
116 | continue; | |
117 | break; | |
118 | } | |
119 | ||
7d1d65cb DB |
120 | if (filter_res == 0) |
121 | continue; | |
3a461da1 DB |
122 | if (filter_res != -1) { |
123 | res->class = 0; | |
7d1d65cb | 124 | res->classid = filter_res; |
3a461da1 DB |
125 | } else { |
126 | *res = prog->res; | |
127 | } | |
7d1d65cb DB |
128 | |
129 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
130 | if (ret < 0) | |
131 | continue; | |
132 | ||
54720df1 | 133 | break; |
7d1d65cb | 134 | } |
54720df1 | 135 | rcu_read_unlock(); |
7d1d65cb | 136 | |
54720df1 | 137 | return ret; |
7d1d65cb DB |
138 | } |
139 | ||
e2e9b654 DB |
140 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
141 | { | |
142 | return !prog->bpf_ops; | |
143 | } | |
144 | ||
332ae8e2 JK |
145 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
146 | enum tc_clsbpf_command cmd) | |
147 | { | |
148 | struct net_device *dev = tp->q->dev_queue->dev; | |
149 | struct tc_cls_bpf_offload bpf_offload = {}; | |
150 | struct tc_to_netdev offload; | |
151 | ||
152 | offload.type = TC_SETUP_CLSBPF; | |
153 | offload.cls_bpf = &bpf_offload; | |
154 | ||
155 | bpf_offload.command = cmd; | |
156 | bpf_offload.exts = &prog->exts; | |
157 | bpf_offload.prog = prog->filter; | |
158 | bpf_offload.name = prog->bpf_name; | |
159 | bpf_offload.exts_integrated = prog->exts_integrated; | |
0d01d45f | 160 | bpf_offload.gen_flags = prog->gen_flags; |
332ae8e2 JK |
161 | |
162 | return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
163 | tp->protocol, &offload); | |
164 | } | |
165 | ||
eadb4148 JK |
166 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
167 | struct cls_bpf_prog *oldprog) | |
332ae8e2 JK |
168 | { |
169 | struct net_device *dev = tp->q->dev_queue->dev; | |
170 | struct cls_bpf_prog *obj = prog; | |
171 | enum tc_clsbpf_command cmd; | |
eadb4148 JK |
172 | bool skip_sw; |
173 | int ret; | |
174 | ||
175 | skip_sw = tc_skip_sw(prog->gen_flags) || | |
176 | (oldprog && tc_skip_sw(oldprog->gen_flags)); | |
332ae8e2 JK |
177 | |
178 | if (oldprog && oldprog->offloaded) { | |
0d01d45f | 179 | if (tc_should_offload(dev, tp, prog->gen_flags)) { |
332ae8e2 | 180 | cmd = TC_CLSBPF_REPLACE; |
eadb4148 | 181 | } else if (!tc_skip_sw(prog->gen_flags)) { |
332ae8e2 JK |
182 | obj = oldprog; |
183 | cmd = TC_CLSBPF_DESTROY; | |
eadb4148 JK |
184 | } else { |
185 | return -EINVAL; | |
332ae8e2 JK |
186 | } |
187 | } else { | |
0d01d45f | 188 | if (!tc_should_offload(dev, tp, prog->gen_flags)) |
eadb4148 | 189 | return skip_sw ? -EINVAL : 0; |
332ae8e2 JK |
190 | cmd = TC_CLSBPF_ADD; |
191 | } | |
192 | ||
eadb4148 JK |
193 | ret = cls_bpf_offload_cmd(tp, obj, cmd); |
194 | if (ret) | |
195 | return skip_sw ? ret : 0; | |
332ae8e2 JK |
196 | |
197 | obj->offloaded = true; | |
198 | if (oldprog) | |
199 | oldprog->offloaded = false; | |
eadb4148 JK |
200 | |
201 | return 0; | |
332ae8e2 JK |
202 | } |
203 | ||
204 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
205 | struct cls_bpf_prog *prog) | |
206 | { | |
207 | int err; | |
208 | ||
209 | if (!prog->offloaded) | |
210 | return; | |
211 | ||
212 | err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY); | |
213 | if (err) { | |
214 | pr_err("Stopping hardware offload failed: %d\n", err); | |
215 | return; | |
216 | } | |
217 | ||
218 | prog->offloaded = false; | |
219 | } | |
220 | ||
68d64063 JK |
221 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
222 | struct cls_bpf_prog *prog) | |
223 | { | |
224 | if (!prog->offloaded) | |
225 | return; | |
226 | ||
227 | cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS); | |
228 | } | |
229 | ||
7d1d65cb DB |
230 | static int cls_bpf_init(struct tcf_proto *tp) |
231 | { | |
232 | struct cls_bpf_head *head; | |
233 | ||
234 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
235 | if (head == NULL) | |
236 | return -ENOBUFS; | |
237 | ||
1f947bf1 JF |
238 | INIT_LIST_HEAD_RCU(&head->plist); |
239 | rcu_assign_pointer(tp->root, head); | |
7d1d65cb DB |
240 | |
241 | return 0; | |
242 | } | |
243 | ||
8d829bdb | 244 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) |
7d1d65cb | 245 | { |
18d0264f | 246 | tcf_exts_destroy(&prog->exts); |
7d1d65cb | 247 | |
e2e9b654 DB |
248 | if (cls_bpf_is_ebpf(prog)) |
249 | bpf_prog_put(prog->filter); | |
250 | else | |
251 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 252 | |
e2e9b654 | 253 | kfree(prog->bpf_name); |
7d1d65cb DB |
254 | kfree(prog->bpf_ops); |
255 | kfree(prog); | |
256 | } | |
257 | ||
8d829bdb | 258 | static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu) |
1f947bf1 | 259 | { |
8d829bdb | 260 | __cls_bpf_delete_prog(container_of(rcu, struct cls_bpf_prog, rcu)); |
1f947bf1 JF |
261 | } |
262 | ||
8d829bdb | 263 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog) |
7d1d65cb | 264 | { |
332ae8e2 | 265 | cls_bpf_stop_offload(tp, prog); |
472f5837 JP |
266 | list_del_rcu(&prog->link); |
267 | tcf_unbind_filter(tp, &prog->res); | |
8d829bdb DB |
268 | call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu); |
269 | } | |
e2e9b654 | 270 | |
8d829bdb DB |
271 | static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg) |
272 | { | |
273 | __cls_bpf_delete(tp, (struct cls_bpf_prog *) arg); | |
472f5837 | 274 | return 0; |
7d1d65cb DB |
275 | } |
276 | ||
1e052be6 | 277 | static bool cls_bpf_destroy(struct tcf_proto *tp, bool force) |
7d1d65cb | 278 | { |
1f947bf1 | 279 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
280 | struct cls_bpf_prog *prog, *tmp; |
281 | ||
1e052be6 CW |
282 | if (!force && !list_empty(&head->plist)) |
283 | return false; | |
284 | ||
8d829bdb DB |
285 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
286 | __cls_bpf_delete(tp, prog); | |
7d1d65cb | 287 | |
1f947bf1 | 288 | kfree_rcu(head, rcu); |
1e052be6 | 289 | return true; |
7d1d65cb DB |
290 | } |
291 | ||
292 | static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle) | |
293 | { | |
1f947bf1 | 294 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
295 | struct cls_bpf_prog *prog; |
296 | unsigned long ret = 0UL; | |
297 | ||
3fe6b49e | 298 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
299 | if (prog->handle == handle) { |
300 | ret = (unsigned long) prog; | |
301 | break; | |
302 | } | |
303 | } | |
304 | ||
305 | return ret; | |
306 | } | |
307 | ||
045efa82 | 308 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 309 | { |
1f947bf1 | 310 | struct sock_filter *bpf_ops; |
e2e9b654 | 311 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 312 | struct bpf_prog *fp; |
33e9fcc6 | 313 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
314 | int ret; |
315 | ||
33e9fcc6 | 316 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
317 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
318 | return -EINVAL; | |
7d1d65cb | 319 | |
33e9fcc6 | 320 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
321 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
322 | return -EINVAL; | |
7913ecf6 | 323 | |
7d1d65cb | 324 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
325 | if (bpf_ops == NULL) |
326 | return -ENOMEM; | |
7d1d65cb DB |
327 | |
328 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
329 | ||
e2e9b654 DB |
330 | fprog_tmp.len = bpf_num_ops; |
331 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 332 | |
e2e9b654 DB |
333 | ret = bpf_prog_create(&fp, &fprog_tmp); |
334 | if (ret < 0) { | |
335 | kfree(bpf_ops); | |
336 | return ret; | |
337 | } | |
7d1d65cb | 338 | |
7d1d65cb | 339 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
340 | prog->bpf_num_ops = bpf_num_ops; |
341 | prog->bpf_name = NULL; | |
7d1d65cb | 342 | prog->filter = fp; |
7d1d65cb | 343 | |
e2e9b654 DB |
344 | return 0; |
345 | } | |
346 | ||
c46646d0 DB |
347 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
348 | const struct tcf_proto *tp) | |
e2e9b654 DB |
349 | { |
350 | struct bpf_prog *fp; | |
351 | char *name = NULL; | |
352 | u32 bpf_fd; | |
353 | ||
354 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
355 | ||
113214be | 356 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS); |
e2e9b654 DB |
357 | if (IS_ERR(fp)) |
358 | return PTR_ERR(fp); | |
359 | ||
e2e9b654 | 360 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 361 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
362 | if (!name) { |
363 | bpf_prog_put(fp); | |
364 | return -ENOMEM; | |
365 | } | |
366 | } | |
367 | ||
368 | prog->bpf_ops = NULL; | |
e2e9b654 | 369 | prog->bpf_name = name; |
e2e9b654 | 370 | prog->filter = fp; |
e2e9b654 | 371 | |
1f211a1b | 372 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
373 | netif_keep_dst(qdisc_dev(tp->q)); |
374 | ||
e2e9b654 DB |
375 | return 0; |
376 | } | |
377 | ||
378 | static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, | |
379 | struct cls_bpf_prog *prog, | |
380 | unsigned long base, struct nlattr **tb, | |
381 | struct nlattr *est, bool ovr) | |
382 | { | |
045efa82 | 383 | bool is_bpf, is_ebpf, have_exts = false; |
e2e9b654 | 384 | struct tcf_exts exts; |
0d01d45f | 385 | u32 gen_flags = 0; |
e2e9b654 DB |
386 | int ret; |
387 | ||
388 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
389 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 390 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
391 | return -EINVAL; |
392 | ||
b9a24bb7 | 393 | ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
e2e9b654 DB |
394 | if (ret < 0) |
395 | return ret; | |
b9a24bb7 WC |
396 | ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr); |
397 | if (ret < 0) | |
398 | goto errout; | |
e2e9b654 | 399 | |
045efa82 DB |
400 | if (tb[TCA_BPF_FLAGS]) { |
401 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
402 | ||
403 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { | |
b9a24bb7 WC |
404 | ret = -EINVAL; |
405 | goto errout; | |
045efa82 DB |
406 | } |
407 | ||
408 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
409 | } | |
0d01d45f JK |
410 | if (tb[TCA_BPF_FLAGS_GEN]) { |
411 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
412 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
413 | !tc_flags_valid(gen_flags)) { | |
414 | ret = -EINVAL; | |
415 | goto errout; | |
416 | } | |
417 | } | |
045efa82 | 418 | |
045efa82 | 419 | prog->exts_integrated = have_exts; |
0d01d45f | 420 | prog->gen_flags = gen_flags; |
e2e9b654 | 421 | |
045efa82 | 422 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
c46646d0 | 423 | cls_bpf_prog_from_efd(tb, prog, tp); |
b9a24bb7 WC |
424 | if (ret < 0) |
425 | goto errout; | |
e2e9b654 | 426 | |
ef146fa4 DB |
427 | if (tb[TCA_BPF_CLASSID]) { |
428 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
429 | tcf_bind_filter(tp, &prog->res, base); | |
430 | } | |
7d1d65cb | 431 | |
ef146fa4 | 432 | tcf_exts_change(tp, &prog->exts, &exts); |
7d1d65cb | 433 | return 0; |
b9a24bb7 WC |
434 | |
435 | errout: | |
436 | tcf_exts_destroy(&exts); | |
437 | return ret; | |
7d1d65cb DB |
438 | } |
439 | ||
440 | static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, | |
441 | struct cls_bpf_head *head) | |
442 | { | |
443 | unsigned int i = 0x80000000; | |
3f2ab135 | 444 | u32 handle; |
7d1d65cb DB |
445 | |
446 | do { | |
447 | if (++head->hgen == 0x7FFFFFFF) | |
448 | head->hgen = 1; | |
449 | } while (--i > 0 && cls_bpf_get(tp, head->hgen)); | |
3f2ab135 DB |
450 | |
451 | if (unlikely(i == 0)) { | |
7d1d65cb | 452 | pr_err("Insufficient number of handles\n"); |
3f2ab135 DB |
453 | handle = 0; |
454 | } else { | |
455 | handle = head->hgen; | |
456 | } | |
7d1d65cb | 457 | |
3f2ab135 | 458 | return handle; |
7d1d65cb DB |
459 | } |
460 | ||
461 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, | |
462 | struct tcf_proto *tp, unsigned long base, | |
463 | u32 handle, struct nlattr **tca, | |
2f7ef2f8 | 464 | unsigned long *arg, bool ovr) |
7d1d65cb | 465 | { |
1f947bf1 JF |
466 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
467 | struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg; | |
7d1d65cb | 468 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 469 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
470 | int ret; |
471 | ||
472 | if (tca[TCA_OPTIONS] == NULL) | |
473 | return -EINVAL; | |
474 | ||
475 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy); | |
476 | if (ret < 0) | |
477 | return ret; | |
478 | ||
7d1d65cb | 479 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 480 | if (!prog) |
7d1d65cb DB |
481 | return -ENOBUFS; |
482 | ||
b9a24bb7 WC |
483 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
484 | if (ret < 0) | |
485 | goto errout; | |
1f947bf1 JF |
486 | |
487 | if (oldprog) { | |
488 | if (handle && oldprog->handle != handle) { | |
489 | ret = -EINVAL; | |
490 | goto errout; | |
491 | } | |
492 | } | |
493 | ||
7d1d65cb DB |
494 | if (handle == 0) |
495 | prog->handle = cls_bpf_grab_new_handle(tp, head); | |
496 | else | |
497 | prog->handle = handle; | |
498 | if (prog->handle == 0) { | |
499 | ret = -EINVAL; | |
500 | goto errout; | |
501 | } | |
502 | ||
5a7a5555 JHS |
503 | ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE], |
504 | ovr); | |
7d1d65cb DB |
505 | if (ret < 0) |
506 | goto errout; | |
507 | ||
eadb4148 JK |
508 | ret = cls_bpf_offload(tp, prog, oldprog); |
509 | if (ret) { | |
8d829bdb | 510 | __cls_bpf_delete_prog(prog); |
eadb4148 JK |
511 | return ret; |
512 | } | |
332ae8e2 | 513 | |
1f947bf1 | 514 | if (oldprog) { |
f6bfc46d | 515 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 516 | tcf_unbind_filter(tp, &oldprog->res); |
8d829bdb | 517 | call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu); |
1f947bf1 JF |
518 | } else { |
519 | list_add_rcu(&prog->link, &head->plist); | |
520 | } | |
7d1d65cb DB |
521 | |
522 | *arg = (unsigned long) prog; | |
7d1d65cb | 523 | return 0; |
b9a24bb7 | 524 | |
7d1d65cb | 525 | errout: |
b9a24bb7 | 526 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 527 | kfree(prog); |
7d1d65cb DB |
528 | return ret; |
529 | } | |
530 | ||
e2e9b654 DB |
531 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
532 | struct sk_buff *skb) | |
533 | { | |
534 | struct nlattr *nla; | |
535 | ||
536 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
537 | return -EMSGSIZE; | |
538 | ||
539 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
540 | sizeof(struct sock_filter)); | |
541 | if (nla == NULL) | |
542 | return -EMSGSIZE; | |
543 | ||
544 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
550 | struct sk_buff *skb) | |
551 | { | |
e2e9b654 DB |
552 | if (prog->bpf_name && |
553 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
554 | return -EMSGSIZE; | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
832d1d5b | 559 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
7d1d65cb DB |
560 | struct sk_buff *skb, struct tcmsg *tm) |
561 | { | |
562 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh; | |
e2e9b654 | 563 | struct nlattr *nest; |
bf007d1c | 564 | u32 bpf_flags = 0; |
e2e9b654 | 565 | int ret; |
7d1d65cb DB |
566 | |
567 | if (prog == NULL) | |
568 | return skb->len; | |
569 | ||
570 | tm->tcm_handle = prog->handle; | |
571 | ||
68d64063 JK |
572 | cls_bpf_offload_update_stats(tp, prog); |
573 | ||
7d1d65cb DB |
574 | nest = nla_nest_start(skb, TCA_OPTIONS); |
575 | if (nest == NULL) | |
576 | goto nla_put_failure; | |
577 | ||
ef146fa4 DB |
578 | if (prog->res.classid && |
579 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 580 | goto nla_put_failure; |
7d1d65cb | 581 | |
e2e9b654 DB |
582 | if (cls_bpf_is_ebpf(prog)) |
583 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
584 | else | |
585 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
586 | if (ret) | |
7d1d65cb DB |
587 | goto nla_put_failure; |
588 | ||
5da57f42 | 589 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
590 | goto nla_put_failure; |
591 | ||
bf007d1c DB |
592 | if (prog->exts_integrated) |
593 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
594 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
595 | goto nla_put_failure; | |
0d01d45f JK |
596 | if (prog->gen_flags && |
597 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
598 | goto nla_put_failure; | |
bf007d1c | 599 | |
7d1d65cb DB |
600 | nla_nest_end(skb, nest); |
601 | ||
5da57f42 | 602 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
603 | goto nla_put_failure; |
604 | ||
605 | return skb->len; | |
606 | ||
607 | nla_put_failure: | |
608 | nla_nest_cancel(skb, nest); | |
609 | return -1; | |
610 | } | |
611 | ||
612 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
613 | { | |
1f947bf1 | 614 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
615 | struct cls_bpf_prog *prog; |
616 | ||
3fe6b49e | 617 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
618 | if (arg->count < arg->skip) |
619 | goto skip; | |
620 | if (arg->fn(tp, (unsigned long) prog, arg) < 0) { | |
621 | arg->stop = 1; | |
622 | break; | |
623 | } | |
624 | skip: | |
625 | arg->count++; | |
626 | } | |
627 | } | |
628 | ||
629 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
630 | .kind = "bpf", | |
631 | .owner = THIS_MODULE, | |
632 | .classify = cls_bpf_classify, | |
633 | .init = cls_bpf_init, | |
634 | .destroy = cls_bpf_destroy, | |
635 | .get = cls_bpf_get, | |
7d1d65cb DB |
636 | .change = cls_bpf_change, |
637 | .delete = cls_bpf_delete, | |
638 | .walk = cls_bpf_walk, | |
639 | .dump = cls_bpf_dump, | |
640 | }; | |
641 | ||
642 | static int __init cls_bpf_init_mod(void) | |
643 | { | |
644 | return register_tcf_proto_ops(&cls_bpf_ops); | |
645 | } | |
646 | ||
647 | static void __exit cls_bpf_exit_mod(void) | |
648 | { | |
649 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
650 | } | |
651 | ||
652 | module_init(cls_bpf_init_mod); | |
653 | module_exit(cls_bpf_exit_mod); |