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); | |
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; | |
150 | struct tc_cls_bpf_offload bpf_offload = {}; | |
151 | struct tc_to_netdev offload; | |
5cecb6cc | 152 | int err; |
332ae8e2 JK |
153 | |
154 | offload.type = TC_SETUP_CLSBPF; | |
155 | offload.cls_bpf = &bpf_offload; | |
156 | ||
157 | bpf_offload.command = cmd; | |
158 | bpf_offload.exts = &prog->exts; | |
159 | bpf_offload.prog = prog->filter; | |
160 | bpf_offload.name = prog->bpf_name; | |
161 | bpf_offload.exts_integrated = prog->exts_integrated; | |
0d01d45f | 162 | bpf_offload.gen_flags = prog->gen_flags; |
332ae8e2 | 163 | |
5cecb6cc | 164 | err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, |
a5fcf8a6 | 165 | tp->chain->index, |
5cecb6cc OG |
166 | tp->protocol, &offload); |
167 | ||
168 | if (!err && (cmd == TC_CLSBPF_ADD || cmd == TC_CLSBPF_REPLACE)) | |
169 | prog->gen_flags |= TCA_CLS_FLAGS_IN_HW; | |
170 | ||
171 | return err; | |
332ae8e2 JK |
172 | } |
173 | ||
eadb4148 JK |
174 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
175 | struct cls_bpf_prog *oldprog) | |
332ae8e2 JK |
176 | { |
177 | struct net_device *dev = tp->q->dev_queue->dev; | |
178 | struct cls_bpf_prog *obj = prog; | |
179 | enum tc_clsbpf_command cmd; | |
eadb4148 JK |
180 | bool skip_sw; |
181 | int ret; | |
182 | ||
183 | skip_sw = tc_skip_sw(prog->gen_flags) || | |
184 | (oldprog && tc_skip_sw(oldprog->gen_flags)); | |
332ae8e2 JK |
185 | |
186 | if (oldprog && oldprog->offloaded) { | |
0d01d45f | 187 | if (tc_should_offload(dev, tp, prog->gen_flags)) { |
332ae8e2 | 188 | cmd = TC_CLSBPF_REPLACE; |
eadb4148 | 189 | } else if (!tc_skip_sw(prog->gen_flags)) { |
332ae8e2 JK |
190 | obj = oldprog; |
191 | cmd = TC_CLSBPF_DESTROY; | |
eadb4148 JK |
192 | } else { |
193 | return -EINVAL; | |
332ae8e2 JK |
194 | } |
195 | } else { | |
0d01d45f | 196 | if (!tc_should_offload(dev, tp, prog->gen_flags)) |
eadb4148 | 197 | return skip_sw ? -EINVAL : 0; |
332ae8e2 JK |
198 | cmd = TC_CLSBPF_ADD; |
199 | } | |
200 | ||
eadb4148 JK |
201 | ret = cls_bpf_offload_cmd(tp, obj, cmd); |
202 | if (ret) | |
203 | return skip_sw ? ret : 0; | |
332ae8e2 JK |
204 | |
205 | obj->offloaded = true; | |
206 | if (oldprog) | |
207 | oldprog->offloaded = false; | |
eadb4148 JK |
208 | |
209 | return 0; | |
332ae8e2 JK |
210 | } |
211 | ||
212 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
213 | struct cls_bpf_prog *prog) | |
214 | { | |
215 | int err; | |
216 | ||
217 | if (!prog->offloaded) | |
218 | return; | |
219 | ||
220 | err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY); | |
221 | if (err) { | |
222 | pr_err("Stopping hardware offload failed: %d\n", err); | |
223 | return; | |
224 | } | |
225 | ||
226 | prog->offloaded = false; | |
227 | } | |
228 | ||
68d64063 JK |
229 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
230 | struct cls_bpf_prog *prog) | |
231 | { | |
232 | if (!prog->offloaded) | |
233 | return; | |
234 | ||
235 | cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS); | |
236 | } | |
237 | ||
7d1d65cb DB |
238 | static int cls_bpf_init(struct tcf_proto *tp) |
239 | { | |
240 | struct cls_bpf_head *head; | |
241 | ||
242 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
243 | if (head == NULL) | |
244 | return -ENOBUFS; | |
245 | ||
1f947bf1 JF |
246 | INIT_LIST_HEAD_RCU(&head->plist); |
247 | rcu_assign_pointer(tp->root, head); | |
7d1d65cb DB |
248 | |
249 | return 0; | |
250 | } | |
251 | ||
8d829bdb | 252 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) |
7d1d65cb | 253 | { |
18d0264f | 254 | tcf_exts_destroy(&prog->exts); |
7d1d65cb | 255 | |
e2e9b654 DB |
256 | if (cls_bpf_is_ebpf(prog)) |
257 | bpf_prog_put(prog->filter); | |
258 | else | |
259 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 260 | |
e2e9b654 | 261 | kfree(prog->bpf_name); |
7d1d65cb DB |
262 | kfree(prog->bpf_ops); |
263 | kfree(prog); | |
264 | } | |
265 | ||
8d829bdb | 266 | static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu) |
1f947bf1 | 267 | { |
8d829bdb | 268 | __cls_bpf_delete_prog(container_of(rcu, struct cls_bpf_prog, rcu)); |
1f947bf1 JF |
269 | } |
270 | ||
8d829bdb | 271 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog) |
7d1d65cb | 272 | { |
332ae8e2 | 273 | cls_bpf_stop_offload(tp, prog); |
472f5837 JP |
274 | list_del_rcu(&prog->link); |
275 | tcf_unbind_filter(tp, &prog->res); | |
8d829bdb DB |
276 | call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu); |
277 | } | |
e2e9b654 | 278 | |
763dbf63 | 279 | static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg, bool *last) |
8d829bdb | 280 | { |
763dbf63 WC |
281 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
282 | ||
8d829bdb | 283 | __cls_bpf_delete(tp, (struct cls_bpf_prog *) arg); |
763dbf63 | 284 | *last = list_empty(&head->plist); |
472f5837 | 285 | return 0; |
7d1d65cb DB |
286 | } |
287 | ||
763dbf63 | 288 | static void cls_bpf_destroy(struct tcf_proto *tp) |
7d1d65cb | 289 | { |
1f947bf1 | 290 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
291 | struct cls_bpf_prog *prog, *tmp; |
292 | ||
8d829bdb DB |
293 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
294 | __cls_bpf_delete(tp, prog); | |
7d1d65cb | 295 | |
1f947bf1 | 296 | kfree_rcu(head, rcu); |
7d1d65cb DB |
297 | } |
298 | ||
299 | static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle) | |
300 | { | |
1f947bf1 | 301 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
302 | struct cls_bpf_prog *prog; |
303 | unsigned long ret = 0UL; | |
304 | ||
3fe6b49e | 305 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
306 | if (prog->handle == handle) { |
307 | ret = (unsigned long) prog; | |
308 | break; | |
309 | } | |
310 | } | |
311 | ||
312 | return ret; | |
313 | } | |
314 | ||
045efa82 | 315 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 316 | { |
1f947bf1 | 317 | struct sock_filter *bpf_ops; |
e2e9b654 | 318 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 319 | struct bpf_prog *fp; |
33e9fcc6 | 320 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
321 | int ret; |
322 | ||
33e9fcc6 | 323 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
324 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
325 | return -EINVAL; | |
7d1d65cb | 326 | |
33e9fcc6 | 327 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
328 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
329 | return -EINVAL; | |
7913ecf6 | 330 | |
7d1d65cb | 331 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
332 | if (bpf_ops == NULL) |
333 | return -ENOMEM; | |
7d1d65cb DB |
334 | |
335 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
336 | ||
e2e9b654 DB |
337 | fprog_tmp.len = bpf_num_ops; |
338 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 339 | |
e2e9b654 DB |
340 | ret = bpf_prog_create(&fp, &fprog_tmp); |
341 | if (ret < 0) { | |
342 | kfree(bpf_ops); | |
343 | return ret; | |
344 | } | |
7d1d65cb | 345 | |
7d1d65cb | 346 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
347 | prog->bpf_num_ops = bpf_num_ops; |
348 | prog->bpf_name = NULL; | |
7d1d65cb | 349 | prog->filter = fp; |
7d1d65cb | 350 | |
e2e9b654 DB |
351 | return 0; |
352 | } | |
353 | ||
c46646d0 DB |
354 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
355 | const struct tcf_proto *tp) | |
e2e9b654 DB |
356 | { |
357 | struct bpf_prog *fp; | |
358 | char *name = NULL; | |
359 | u32 bpf_fd; | |
360 | ||
361 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
362 | ||
113214be | 363 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS); |
e2e9b654 DB |
364 | if (IS_ERR(fp)) |
365 | return PTR_ERR(fp); | |
366 | ||
e2e9b654 | 367 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 368 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
369 | if (!name) { |
370 | bpf_prog_put(fp); | |
371 | return -ENOMEM; | |
372 | } | |
373 | } | |
374 | ||
375 | prog->bpf_ops = NULL; | |
e2e9b654 | 376 | prog->bpf_name = name; |
e2e9b654 | 377 | prog->filter = fp; |
e2e9b654 | 378 | |
1f211a1b | 379 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
380 | netif_keep_dst(qdisc_dev(tp->q)); |
381 | ||
e2e9b654 DB |
382 | return 0; |
383 | } | |
384 | ||
385 | static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, | |
386 | struct cls_bpf_prog *prog, | |
387 | unsigned long base, struct nlattr **tb, | |
388 | struct nlattr *est, bool ovr) | |
389 | { | |
045efa82 | 390 | bool is_bpf, is_ebpf, have_exts = false; |
e2e9b654 | 391 | struct tcf_exts exts; |
0d01d45f | 392 | u32 gen_flags = 0; |
e2e9b654 DB |
393 | int ret; |
394 | ||
395 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
396 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 397 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
398 | return -EINVAL; |
399 | ||
b9a24bb7 | 400 | ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
e2e9b654 DB |
401 | if (ret < 0) |
402 | return ret; | |
b9a24bb7 WC |
403 | ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr); |
404 | if (ret < 0) | |
405 | goto errout; | |
e2e9b654 | 406 | |
045efa82 DB |
407 | if (tb[TCA_BPF_FLAGS]) { |
408 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
409 | ||
410 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { | |
b9a24bb7 WC |
411 | ret = -EINVAL; |
412 | goto errout; | |
045efa82 DB |
413 | } |
414 | ||
415 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
416 | } | |
0d01d45f JK |
417 | if (tb[TCA_BPF_FLAGS_GEN]) { |
418 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
419 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
420 | !tc_flags_valid(gen_flags)) { | |
421 | ret = -EINVAL; | |
422 | goto errout; | |
423 | } | |
424 | } | |
045efa82 | 425 | |
045efa82 | 426 | prog->exts_integrated = have_exts; |
0d01d45f | 427 | prog->gen_flags = gen_flags; |
e2e9b654 | 428 | |
045efa82 | 429 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
c46646d0 | 430 | cls_bpf_prog_from_efd(tb, prog, tp); |
b9a24bb7 WC |
431 | if (ret < 0) |
432 | goto errout; | |
e2e9b654 | 433 | |
ef146fa4 DB |
434 | if (tb[TCA_BPF_CLASSID]) { |
435 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
436 | tcf_bind_filter(tp, &prog->res, base); | |
437 | } | |
7d1d65cb | 438 | |
ef146fa4 | 439 | tcf_exts_change(tp, &prog->exts, &exts); |
7d1d65cb | 440 | return 0; |
b9a24bb7 WC |
441 | |
442 | errout: | |
443 | tcf_exts_destroy(&exts); | |
444 | return ret; | |
7d1d65cb DB |
445 | } |
446 | ||
447 | static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, | |
448 | struct cls_bpf_head *head) | |
449 | { | |
450 | unsigned int i = 0x80000000; | |
3f2ab135 | 451 | u32 handle; |
7d1d65cb DB |
452 | |
453 | do { | |
454 | if (++head->hgen == 0x7FFFFFFF) | |
455 | head->hgen = 1; | |
456 | } while (--i > 0 && cls_bpf_get(tp, head->hgen)); | |
3f2ab135 DB |
457 | |
458 | if (unlikely(i == 0)) { | |
7d1d65cb | 459 | pr_err("Insufficient number of handles\n"); |
3f2ab135 DB |
460 | handle = 0; |
461 | } else { | |
462 | handle = head->hgen; | |
463 | } | |
7d1d65cb | 464 | |
3f2ab135 | 465 | return handle; |
7d1d65cb DB |
466 | } |
467 | ||
468 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, | |
469 | struct tcf_proto *tp, unsigned long base, | |
470 | u32 handle, struct nlattr **tca, | |
2f7ef2f8 | 471 | unsigned long *arg, bool ovr) |
7d1d65cb | 472 | { |
1f947bf1 JF |
473 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
474 | struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg; | |
7d1d65cb | 475 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 476 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
477 | int ret; |
478 | ||
479 | if (tca[TCA_OPTIONS] == NULL) | |
480 | return -EINVAL; | |
481 | ||
fceb6435 JB |
482 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
483 | NULL); | |
7d1d65cb DB |
484 | if (ret < 0) |
485 | return ret; | |
486 | ||
7d1d65cb | 487 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 488 | if (!prog) |
7d1d65cb DB |
489 | return -ENOBUFS; |
490 | ||
b9a24bb7 WC |
491 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
492 | if (ret < 0) | |
493 | goto errout; | |
1f947bf1 JF |
494 | |
495 | if (oldprog) { | |
496 | if (handle && oldprog->handle != handle) { | |
497 | ret = -EINVAL; | |
498 | goto errout; | |
499 | } | |
500 | } | |
501 | ||
7d1d65cb DB |
502 | if (handle == 0) |
503 | prog->handle = cls_bpf_grab_new_handle(tp, head); | |
504 | else | |
505 | prog->handle = handle; | |
506 | if (prog->handle == 0) { | |
507 | ret = -EINVAL; | |
508 | goto errout; | |
509 | } | |
510 | ||
5a7a5555 JHS |
511 | ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE], |
512 | ovr); | |
7d1d65cb DB |
513 | if (ret < 0) |
514 | goto errout; | |
515 | ||
eadb4148 JK |
516 | ret = cls_bpf_offload(tp, prog, oldprog); |
517 | if (ret) { | |
8d829bdb | 518 | __cls_bpf_delete_prog(prog); |
eadb4148 JK |
519 | return ret; |
520 | } | |
332ae8e2 | 521 | |
5cecb6cc OG |
522 | if (!tc_in_hw(prog->gen_flags)) |
523 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
524 | ||
1f947bf1 | 525 | if (oldprog) { |
f6bfc46d | 526 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 527 | tcf_unbind_filter(tp, &oldprog->res); |
8d829bdb | 528 | call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu); |
1f947bf1 JF |
529 | } else { |
530 | list_add_rcu(&prog->link, &head->plist); | |
531 | } | |
7d1d65cb DB |
532 | |
533 | *arg = (unsigned long) prog; | |
7d1d65cb | 534 | return 0; |
b9a24bb7 | 535 | |
7d1d65cb | 536 | errout: |
b9a24bb7 | 537 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 538 | kfree(prog); |
7d1d65cb DB |
539 | return ret; |
540 | } | |
541 | ||
e2e9b654 DB |
542 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
543 | struct sk_buff *skb) | |
544 | { | |
545 | struct nlattr *nla; | |
546 | ||
547 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
548 | return -EMSGSIZE; | |
549 | ||
550 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
551 | sizeof(struct sock_filter)); | |
552 | if (nla == NULL) | |
553 | return -EMSGSIZE; | |
554 | ||
555 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
561 | struct sk_buff *skb) | |
562 | { | |
7bd509e3 DB |
563 | struct nlattr *nla; |
564 | ||
e2e9b654 DB |
565 | if (prog->bpf_name && |
566 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
567 | return -EMSGSIZE; | |
568 | ||
f1f7714e | 569 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
570 | if (nla == NULL) |
571 | return -EMSGSIZE; | |
572 | ||
f1f7714e | 573 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 574 | |
e2e9b654 DB |
575 | return 0; |
576 | } | |
577 | ||
832d1d5b | 578 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
7d1d65cb DB |
579 | struct sk_buff *skb, struct tcmsg *tm) |
580 | { | |
581 | struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh; | |
e2e9b654 | 582 | struct nlattr *nest; |
bf007d1c | 583 | u32 bpf_flags = 0; |
e2e9b654 | 584 | int ret; |
7d1d65cb DB |
585 | |
586 | if (prog == NULL) | |
587 | return skb->len; | |
588 | ||
589 | tm->tcm_handle = prog->handle; | |
590 | ||
68d64063 JK |
591 | cls_bpf_offload_update_stats(tp, prog); |
592 | ||
7d1d65cb DB |
593 | nest = nla_nest_start(skb, TCA_OPTIONS); |
594 | if (nest == NULL) | |
595 | goto nla_put_failure; | |
596 | ||
ef146fa4 DB |
597 | if (prog->res.classid && |
598 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 599 | goto nla_put_failure; |
7d1d65cb | 600 | |
e2e9b654 DB |
601 | if (cls_bpf_is_ebpf(prog)) |
602 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
603 | else | |
604 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
605 | if (ret) | |
7d1d65cb DB |
606 | goto nla_put_failure; |
607 | ||
5da57f42 | 608 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
609 | goto nla_put_failure; |
610 | ||
bf007d1c DB |
611 | if (prog->exts_integrated) |
612 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
613 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
614 | goto nla_put_failure; | |
0d01d45f JK |
615 | if (prog->gen_flags && |
616 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
617 | goto nla_put_failure; | |
bf007d1c | 618 | |
7d1d65cb DB |
619 | nla_nest_end(skb, nest); |
620 | ||
5da57f42 | 621 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
622 | goto nla_put_failure; |
623 | ||
624 | return skb->len; | |
625 | ||
626 | nla_put_failure: | |
627 | nla_nest_cancel(skb, nest); | |
628 | return -1; | |
629 | } | |
630 | ||
631 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
632 | { | |
1f947bf1 | 633 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
634 | struct cls_bpf_prog *prog; |
635 | ||
3fe6b49e | 636 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
637 | if (arg->count < arg->skip) |
638 | goto skip; | |
639 | if (arg->fn(tp, (unsigned long) prog, arg) < 0) { | |
640 | arg->stop = 1; | |
641 | break; | |
642 | } | |
643 | skip: | |
644 | arg->count++; | |
645 | } | |
646 | } | |
647 | ||
648 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
649 | .kind = "bpf", | |
650 | .owner = THIS_MODULE, | |
651 | .classify = cls_bpf_classify, | |
652 | .init = cls_bpf_init, | |
653 | .destroy = cls_bpf_destroy, | |
654 | .get = cls_bpf_get, | |
7d1d65cb DB |
655 | .change = cls_bpf_change, |
656 | .delete = cls_bpf_delete, | |
657 | .walk = cls_bpf_walk, | |
658 | .dump = cls_bpf_dump, | |
659 | }; | |
660 | ||
661 | static int __init cls_bpf_init_mod(void) | |
662 | { | |
663 | return register_tcf_proto_ops(&cls_bpf_ops); | |
664 | } | |
665 | ||
666 | static void __exit cls_bpf_exit_mod(void) | |
667 | { | |
668 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
669 | } | |
670 | ||
671 | module_init(cls_bpf_init_mod); | |
672 | module_exit(cls_bpf_exit_mod); |