1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Berkeley Packet Filter based traffic classifier |
4 | * |
5 | * Might be used to classify traffic through flexible, user-defined and |
6 | * possibly JIT-ed BPF filters for traffic control as an alternative to |
7 | * ematches. |
8 | * |
9 | * (C) 2013 Daniel Borkmann <dborkman@redhat.com> |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/filter.h> |
16 | #include <linux/bpf.h> |
17 | #include <linux/idr.h> |
18 | |
19 | #include <net/rtnetlink.h> |
20 | #include <net/pkt_cls.h> |
21 | #include <net/sock.h> |
22 | #include <net/tc_wrapper.h> |
23 | |
24 | MODULE_LICENSE("GPL" ); |
25 | MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>" ); |
26 | MODULE_DESCRIPTION("TC BPF based classifier" ); |
27 | |
28 | #define CLS_BPF_NAME_LEN 256 |
29 | #define CLS_BPF_SUPPORTED_GEN_FLAGS \ |
30 | (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) |
31 | |
32 | struct cls_bpf_head { |
33 | struct list_head plist; |
34 | struct idr handle_idr; |
35 | struct rcu_head rcu; |
36 | }; |
37 | |
38 | struct cls_bpf_prog { |
39 | struct bpf_prog *filter; |
40 | struct list_head link; |
41 | struct tcf_result res; |
42 | bool exts_integrated; |
43 | u32 gen_flags; |
44 | unsigned int in_hw_count; |
45 | struct tcf_exts exts; |
46 | u32 handle; |
47 | u16 bpf_num_ops; |
48 | struct sock_filter *bpf_ops; |
49 | const char *bpf_name; |
50 | struct tcf_proto *tp; |
51 | struct rcu_work rwork; |
52 | }; |
53 | |
54 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { |
55 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, |
56 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
57 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
58 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
59 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
60 | .len = CLS_BPF_NAME_LEN }, |
61 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
62 | [TCA_BPF_OPS] = { .type = NLA_BINARY, |
63 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, |
64 | }; |
65 | |
66 | static int cls_bpf_exec_opcode(int code) |
67 | { |
68 | switch (code) { |
69 | case TC_ACT_OK: |
70 | case TC_ACT_SHOT: |
71 | case TC_ACT_STOLEN: |
72 | case TC_ACT_TRAP: |
73 | case TC_ACT_REDIRECT: |
74 | case TC_ACT_UNSPEC: |
75 | return code; |
76 | default: |
77 | return TC_ACT_UNSPEC; |
78 | } |
79 | } |
80 | |
81 | TC_INDIRECT_SCOPE int cls_bpf_classify(struct sk_buff *skb, |
82 | const struct tcf_proto *tp, |
83 | struct tcf_result *res) |
84 | { |
85 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
86 | bool at_ingress = skb_at_tc_ingress(skb); |
87 | struct cls_bpf_prog *prog; |
88 | int ret = -1; |
89 | |
90 | list_for_each_entry_rcu(prog, &head->plist, link) { |
91 | int filter_res; |
92 | |
93 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
94 | |
95 | if (tc_skip_sw(flags: prog->gen_flags)) { |
96 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; |
97 | } else if (at_ingress) { |
98 | /* It is safe to push/pull even if skb_shared() */ |
99 | __skb_push(skb, len: skb->mac_len); |
100 | bpf_compute_data_pointers(skb); |
101 | filter_res = bpf_prog_run(prog: prog->filter, ctx: skb); |
102 | __skb_pull(skb, len: skb->mac_len); |
103 | } else { |
104 | bpf_compute_data_pointers(skb); |
105 | filter_res = bpf_prog_run(prog: prog->filter, ctx: skb); |
106 | } |
107 | if (unlikely(!skb->tstamp && skb->mono_delivery_time)) |
108 | skb->mono_delivery_time = 0; |
109 | |
110 | if (prog->exts_integrated) { |
111 | res->class = 0; |
112 | res->classid = TC_H_MAJ(prog->res.classid) | |
113 | qdisc_skb_cb(skb)->tc_classid; |
114 | |
115 | ret = cls_bpf_exec_opcode(code: filter_res); |
116 | if (ret == TC_ACT_UNSPEC) |
117 | continue; |
118 | break; |
119 | } |
120 | |
121 | if (filter_res == 0) |
122 | continue; |
123 | if (filter_res != -1) { |
124 | res->class = 0; |
125 | res->classid = filter_res; |
126 | } else { |
127 | *res = prog->res; |
128 | } |
129 | |
130 | ret = tcf_exts_exec(skb, exts: &prog->exts, res); |
131 | if (ret < 0) |
132 | continue; |
133 | |
134 | break; |
135 | } |
136 | |
137 | return ret; |
138 | } |
139 | |
140 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
141 | { |
142 | return !prog->bpf_ops; |
143 | } |
144 | |
145 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
146 | struct cls_bpf_prog *oldprog, |
147 | struct netlink_ext_ack *extack) |
148 | { |
149 | struct tcf_block *block = tp->chain->block; |
150 | struct tc_cls_bpf_offload cls_bpf = {}; |
151 | struct cls_bpf_prog *obj; |
152 | bool skip_sw; |
153 | int err; |
154 | |
155 | skip_sw = prog && tc_skip_sw(flags: prog->gen_flags); |
156 | obj = prog ?: oldprog; |
157 | |
158 | tc_cls_common_offload_init(cls_common: &cls_bpf.common, tp, flags: obj->gen_flags, extack); |
159 | cls_bpf.command = TC_CLSBPF_OFFLOAD; |
160 | cls_bpf.exts = &obj->exts; |
161 | cls_bpf.prog = prog ? prog->filter : NULL; |
162 | cls_bpf.oldprog = oldprog ? oldprog->filter : NULL; |
163 | cls_bpf.name = obj->bpf_name; |
164 | cls_bpf.exts_integrated = obj->exts_integrated; |
165 | |
166 | if (oldprog && prog) |
167 | err = tc_setup_cb_replace(block, tp, type: TC_SETUP_CLSBPF, type_data: &cls_bpf, |
168 | err_stop: skip_sw, old_flags: &oldprog->gen_flags, |
169 | old_in_hw_count: &oldprog->in_hw_count, |
170 | new_flags: &prog->gen_flags, new_in_hw_count: &prog->in_hw_count, |
171 | rtnl_held: true); |
172 | else if (prog) |
173 | err = tc_setup_cb_add(block, tp, type: TC_SETUP_CLSBPF, type_data: &cls_bpf, |
174 | err_stop: skip_sw, flags: &prog->gen_flags, |
175 | in_hw_count: &prog->in_hw_count, rtnl_held: true); |
176 | else |
177 | err = tc_setup_cb_destroy(block, tp, type: TC_SETUP_CLSBPF, type_data: &cls_bpf, |
178 | err_stop: skip_sw, flags: &oldprog->gen_flags, |
179 | in_hw_count: &oldprog->in_hw_count, rtnl_held: true); |
180 | |
181 | if (prog && err) { |
182 | cls_bpf_offload_cmd(tp, prog: oldprog, oldprog: prog, extack); |
183 | return err; |
184 | } |
185 | |
186 | if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) |
187 | return -EINVAL; |
188 | |
189 | return 0; |
190 | } |
191 | |
192 | static u32 cls_bpf_flags(u32 flags) |
193 | { |
194 | return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; |
195 | } |
196 | |
197 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
198 | struct cls_bpf_prog *oldprog, |
199 | struct netlink_ext_ack *extack) |
200 | { |
201 | if (prog && oldprog && |
202 | cls_bpf_flags(flags: prog->gen_flags) != |
203 | cls_bpf_flags(flags: oldprog->gen_flags)) |
204 | return -EINVAL; |
205 | |
206 | if (prog && tc_skip_hw(flags: prog->gen_flags)) |
207 | prog = NULL; |
208 | if (oldprog && tc_skip_hw(flags: oldprog->gen_flags)) |
209 | oldprog = NULL; |
210 | if (!prog && !oldprog) |
211 | return 0; |
212 | |
213 | return cls_bpf_offload_cmd(tp, prog, oldprog, extack); |
214 | } |
215 | |
216 | static void cls_bpf_stop_offload(struct tcf_proto *tp, |
217 | struct cls_bpf_prog *prog, |
218 | struct netlink_ext_ack *extack) |
219 | { |
220 | int err; |
221 | |
222 | err = cls_bpf_offload_cmd(tp, NULL, oldprog: prog, extack); |
223 | if (err) |
224 | pr_err("Stopping hardware offload failed: %d\n" , err); |
225 | } |
226 | |
227 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
228 | struct cls_bpf_prog *prog) |
229 | { |
230 | struct tcf_block *block = tp->chain->block; |
231 | struct tc_cls_bpf_offload cls_bpf = {}; |
232 | |
233 | tc_cls_common_offload_init(cls_common: &cls_bpf.common, tp, flags: prog->gen_flags, NULL); |
234 | cls_bpf.command = TC_CLSBPF_STATS; |
235 | cls_bpf.exts = &prog->exts; |
236 | cls_bpf.prog = prog->filter; |
237 | cls_bpf.name = prog->bpf_name; |
238 | cls_bpf.exts_integrated = prog->exts_integrated; |
239 | |
240 | tc_setup_cb_call(block, type: TC_SETUP_CLSBPF, type_data: &cls_bpf, err_stop: false, rtnl_held: true); |
241 | } |
242 | |
243 | static int cls_bpf_init(struct tcf_proto *tp) |
244 | { |
245 | struct cls_bpf_head *head; |
246 | |
247 | head = kzalloc(size: sizeof(*head), GFP_KERNEL); |
248 | if (head == NULL) |
249 | return -ENOBUFS; |
250 | |
251 | INIT_LIST_HEAD_RCU(list: &head->plist); |
252 | idr_init(idr: &head->handle_idr); |
253 | rcu_assign_pointer(tp->root, head); |
254 | |
255 | return 0; |
256 | } |
257 | |
258 | static void cls_bpf_free_parms(struct cls_bpf_prog *prog) |
259 | { |
260 | if (cls_bpf_is_ebpf(prog)) |
261 | bpf_prog_put(prog: prog->filter); |
262 | else |
263 | bpf_prog_destroy(fp: prog->filter); |
264 | |
265 | kfree(objp: prog->bpf_name); |
266 | kfree(objp: prog->bpf_ops); |
267 | } |
268 | |
269 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) |
270 | { |
271 | tcf_exts_destroy(exts: &prog->exts); |
272 | tcf_exts_put_net(exts: &prog->exts); |
273 | |
274 | cls_bpf_free_parms(prog); |
275 | kfree(objp: prog); |
276 | } |
277 | |
278 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
279 | { |
280 | struct cls_bpf_prog *prog = container_of(to_rcu_work(work), |
281 | struct cls_bpf_prog, |
282 | rwork); |
283 | rtnl_lock(); |
284 | __cls_bpf_delete_prog(prog); |
285 | rtnl_unlock(); |
286 | } |
287 | |
288 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
289 | struct netlink_ext_ack *extack) |
290 | { |
291 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
292 | |
293 | idr_remove(&head->handle_idr, id: prog->handle); |
294 | cls_bpf_stop_offload(tp, prog, extack); |
295 | list_del_rcu(entry: &prog->link); |
296 | tcf_unbind_filter(tp, r: &prog->res); |
297 | if (tcf_exts_get_net(exts: &prog->exts)) |
298 | tcf_queue_work(rwork: &prog->rwork, func: cls_bpf_delete_prog_work); |
299 | else |
300 | __cls_bpf_delete_prog(prog); |
301 | } |
302 | |
303 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, |
304 | bool rtnl_held, struct netlink_ext_ack *extack) |
305 | { |
306 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
307 | |
308 | __cls_bpf_delete(tp, prog: arg, extack); |
309 | *last = list_empty(head: &head->plist); |
310 | return 0; |
311 | } |
312 | |
313 | static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, |
314 | struct netlink_ext_ack *extack) |
315 | { |
316 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
317 | struct cls_bpf_prog *prog, *tmp; |
318 | |
319 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
320 | __cls_bpf_delete(tp, prog, extack); |
321 | |
322 | idr_destroy(&head->handle_idr); |
323 | kfree_rcu(head, rcu); |
324 | } |
325 | |
326 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
327 | { |
328 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
329 | struct cls_bpf_prog *prog; |
330 | |
331 | list_for_each_entry(prog, &head->plist, link) { |
332 | if (prog->handle == handle) |
333 | return prog; |
334 | } |
335 | |
336 | return NULL; |
337 | } |
338 | |
339 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
340 | { |
341 | struct sock_filter *bpf_ops; |
342 | struct sock_fprog_kern fprog_tmp; |
343 | struct bpf_prog *fp; |
344 | u16 bpf_size, bpf_num_ops; |
345 | int ret; |
346 | |
347 | bpf_num_ops = nla_get_u16(nla: tb[TCA_BPF_OPS_LEN]); |
348 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
349 | return -EINVAL; |
350 | |
351 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
352 | if (bpf_size != nla_len(nla: tb[TCA_BPF_OPS])) |
353 | return -EINVAL; |
354 | |
355 | bpf_ops = kmemdup(p: nla_data(nla: tb[TCA_BPF_OPS]), size: bpf_size, GFP_KERNEL); |
356 | if (bpf_ops == NULL) |
357 | return -ENOMEM; |
358 | |
359 | fprog_tmp.len = bpf_num_ops; |
360 | fprog_tmp.filter = bpf_ops; |
361 | |
362 | ret = bpf_prog_create(pfp: &fp, fprog: &fprog_tmp); |
363 | if (ret < 0) { |
364 | kfree(objp: bpf_ops); |
365 | return ret; |
366 | } |
367 | |
368 | prog->bpf_ops = bpf_ops; |
369 | prog->bpf_num_ops = bpf_num_ops; |
370 | prog->bpf_name = NULL; |
371 | prog->filter = fp; |
372 | |
373 | return 0; |
374 | } |
375 | |
376 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
377 | u32 gen_flags, const struct tcf_proto *tp) |
378 | { |
379 | struct bpf_prog *fp; |
380 | char *name = NULL; |
381 | bool skip_sw; |
382 | u32 bpf_fd; |
383 | |
384 | bpf_fd = nla_get_u32(nla: tb[TCA_BPF_FD]); |
385 | skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; |
386 | |
387 | fp = bpf_prog_get_type_dev(ufd: bpf_fd, type: BPF_PROG_TYPE_SCHED_CLS, attach_drv: skip_sw); |
388 | if (IS_ERR(ptr: fp)) |
389 | return PTR_ERR(ptr: fp); |
390 | |
391 | if (tb[TCA_BPF_NAME]) { |
392 | name = nla_memdup(src: tb[TCA_BPF_NAME], GFP_KERNEL); |
393 | if (!name) { |
394 | bpf_prog_put(prog: fp); |
395 | return -ENOMEM; |
396 | } |
397 | } |
398 | |
399 | prog->bpf_ops = NULL; |
400 | prog->bpf_name = name; |
401 | prog->filter = fp; |
402 | |
403 | if (fp->dst_needed) |
404 | tcf_block_netif_keep_dst(block: tp->chain->block); |
405 | |
406 | return 0; |
407 | } |
408 | |
409 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, |
410 | struct tcf_proto *tp, unsigned long base, |
411 | u32 handle, struct nlattr **tca, |
412 | void **arg, u32 flags, |
413 | struct netlink_ext_ack *extack) |
414 | { |
415 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
416 | bool is_bpf, is_ebpf, have_exts = false; |
417 | struct cls_bpf_prog *oldprog = *arg; |
418 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
419 | bool bound_to_filter = false; |
420 | struct cls_bpf_prog *prog; |
421 | u32 gen_flags = 0; |
422 | int ret; |
423 | |
424 | if (tca[TCA_OPTIONS] == NULL) |
425 | return -EINVAL; |
426 | |
427 | ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, nla: tca[TCA_OPTIONS], |
428 | policy: bpf_policy, NULL); |
429 | if (ret < 0) |
430 | return ret; |
431 | |
432 | prog = kzalloc(size: sizeof(*prog), GFP_KERNEL); |
433 | if (!prog) |
434 | return -ENOBUFS; |
435 | |
436 | ret = tcf_exts_init(exts: &prog->exts, net, action: TCA_BPF_ACT, police: TCA_BPF_POLICE); |
437 | if (ret < 0) |
438 | goto errout; |
439 | |
440 | if (oldprog) { |
441 | if (handle && oldprog->handle != handle) { |
442 | ret = -EINVAL; |
443 | goto errout; |
444 | } |
445 | } |
446 | |
447 | if (handle == 0) { |
448 | handle = 1; |
449 | ret = idr_alloc_u32(&head->handle_idr, ptr: prog, id: &handle, |
450 | INT_MAX, GFP_KERNEL); |
451 | } else if (!oldprog) { |
452 | ret = idr_alloc_u32(&head->handle_idr, ptr: prog, id: &handle, |
453 | max: handle, GFP_KERNEL); |
454 | } |
455 | |
456 | if (ret) |
457 | goto errout; |
458 | prog->handle = handle; |
459 | |
460 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; |
461 | is_ebpf = tb[TCA_BPF_FD]; |
462 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) { |
463 | ret = -EINVAL; |
464 | goto errout_idr; |
465 | } |
466 | |
467 | ret = tcf_exts_validate(net, tp, tb, rate_tlv: tca[TCA_RATE], exts: &prog->exts, |
468 | flags, extack); |
469 | if (ret < 0) |
470 | goto errout_idr; |
471 | |
472 | if (tb[TCA_BPF_FLAGS]) { |
473 | u32 bpf_flags = nla_get_u32(nla: tb[TCA_BPF_FLAGS]); |
474 | |
475 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { |
476 | ret = -EINVAL; |
477 | goto errout_idr; |
478 | } |
479 | |
480 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; |
481 | } |
482 | if (tb[TCA_BPF_FLAGS_GEN]) { |
483 | gen_flags = nla_get_u32(nla: tb[TCA_BPF_FLAGS_GEN]); |
484 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || |
485 | !tc_flags_valid(flags: gen_flags)) { |
486 | ret = -EINVAL; |
487 | goto errout_idr; |
488 | } |
489 | } |
490 | |
491 | prog->exts_integrated = have_exts; |
492 | prog->gen_flags = gen_flags; |
493 | |
494 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
495 | cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); |
496 | if (ret < 0) |
497 | goto errout_idr; |
498 | |
499 | if (tb[TCA_BPF_CLASSID]) { |
500 | prog->res.classid = nla_get_u32(nla: tb[TCA_BPF_CLASSID]); |
501 | tcf_bind_filter(tp, r: &prog->res, base); |
502 | bound_to_filter = true; |
503 | } |
504 | |
505 | ret = cls_bpf_offload(tp, prog, oldprog, extack); |
506 | if (ret) |
507 | goto errout_parms; |
508 | |
509 | if (!tc_in_hw(flags: prog->gen_flags)) |
510 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; |
511 | |
512 | if (oldprog) { |
513 | idr_replace(&head->handle_idr, prog, id: handle); |
514 | list_replace_rcu(old: &oldprog->link, new: &prog->link); |
515 | tcf_unbind_filter(tp, r: &oldprog->res); |
516 | tcf_exts_get_net(exts: &oldprog->exts); |
517 | tcf_queue_work(rwork: &oldprog->rwork, func: cls_bpf_delete_prog_work); |
518 | } else { |
519 | list_add_rcu(new: &prog->link, head: &head->plist); |
520 | } |
521 | |
522 | *arg = prog; |
523 | return 0; |
524 | |
525 | errout_parms: |
526 | if (bound_to_filter) |
527 | tcf_unbind_filter(tp, r: &prog->res); |
528 | cls_bpf_free_parms(prog); |
529 | errout_idr: |
530 | if (!oldprog) |
531 | idr_remove(&head->handle_idr, id: prog->handle); |
532 | errout: |
533 | tcf_exts_destroy(exts: &prog->exts); |
534 | kfree(objp: prog); |
535 | return ret; |
536 | } |
537 | |
538 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
539 | struct sk_buff *skb) |
540 | { |
541 | struct nlattr *nla; |
542 | |
543 | if (nla_put_u16(skb, attrtype: TCA_BPF_OPS_LEN, value: prog->bpf_num_ops)) |
544 | return -EMSGSIZE; |
545 | |
546 | nla = nla_reserve(skb, attrtype: TCA_BPF_OPS, attrlen: prog->bpf_num_ops * |
547 | sizeof(struct sock_filter)); |
548 | if (nla == NULL) |
549 | return -EMSGSIZE; |
550 | |
551 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); |
552 | |
553 | return 0; |
554 | } |
555 | |
556 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, |
557 | struct sk_buff *skb) |
558 | { |
559 | struct nlattr *nla; |
560 | |
561 | if (prog->bpf_name && |
562 | nla_put_string(skb, attrtype: TCA_BPF_NAME, str: prog->bpf_name)) |
563 | return -EMSGSIZE; |
564 | |
565 | if (nla_put_u32(skb, attrtype: TCA_BPF_ID, value: prog->filter->aux->id)) |
566 | return -EMSGSIZE; |
567 | |
568 | nla = nla_reserve(skb, attrtype: TCA_BPF_TAG, attrlen: sizeof(prog->filter->tag)); |
569 | if (nla == NULL) |
570 | return -EMSGSIZE; |
571 | |
572 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
573 | |
574 | return 0; |
575 | } |
576 | |
577 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
578 | struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) |
579 | { |
580 | struct cls_bpf_prog *prog = fh; |
581 | struct nlattr *nest; |
582 | u32 bpf_flags = 0; |
583 | int ret; |
584 | |
585 | if (prog == NULL) |
586 | return skb->len; |
587 | |
588 | tm->tcm_handle = prog->handle; |
589 | |
590 | cls_bpf_offload_update_stats(tp, prog); |
591 | |
592 | nest = nla_nest_start_noflag(skb, attrtype: TCA_OPTIONS); |
593 | if (nest == NULL) |
594 | goto nla_put_failure; |
595 | |
596 | if (prog->res.classid && |
597 | nla_put_u32(skb, attrtype: TCA_BPF_CLASSID, value: prog->res.classid)) |
598 | goto nla_put_failure; |
599 | |
600 | if (cls_bpf_is_ebpf(prog)) |
601 | ret = cls_bpf_dump_ebpf_info(prog, skb); |
602 | else |
603 | ret = cls_bpf_dump_bpf_info(prog, skb); |
604 | if (ret) |
605 | goto nla_put_failure; |
606 | |
607 | if (tcf_exts_dump(skb, exts: &prog->exts) < 0) |
608 | goto nla_put_failure; |
609 | |
610 | if (prog->exts_integrated) |
611 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; |
612 | if (bpf_flags && nla_put_u32(skb, attrtype: TCA_BPF_FLAGS, value: bpf_flags)) |
613 | goto nla_put_failure; |
614 | if (prog->gen_flags && |
615 | nla_put_u32(skb, attrtype: TCA_BPF_FLAGS_GEN, value: prog->gen_flags)) |
616 | goto nla_put_failure; |
617 | |
618 | nla_nest_end(skb, start: nest); |
619 | |
620 | if (tcf_exts_dump_stats(skb, exts: &prog->exts) < 0) |
621 | goto nla_put_failure; |
622 | |
623 | return skb->len; |
624 | |
625 | nla_put_failure: |
626 | nla_nest_cancel(skb, start: nest); |
627 | return -1; |
628 | } |
629 | |
630 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl, |
631 | void *q, unsigned long base) |
632 | { |
633 | struct cls_bpf_prog *prog = fh; |
634 | |
635 | tc_cls_bind_class(classid, cl, q, res: &prog->res, base); |
636 | } |
637 | |
638 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
639 | bool rtnl_held) |
640 | { |
641 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
642 | struct cls_bpf_prog *prog; |
643 | |
644 | list_for_each_entry(prog, &head->plist, link) { |
645 | if (!tc_cls_stats_dump(tp, arg, filter: prog)) |
646 | break; |
647 | } |
648 | } |
649 | |
650 | static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, |
651 | void *cb_priv, struct netlink_ext_ack *extack) |
652 | { |
653 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
654 | struct tcf_block *block = tp->chain->block; |
655 | struct tc_cls_bpf_offload cls_bpf = {}; |
656 | struct cls_bpf_prog *prog; |
657 | int err; |
658 | |
659 | list_for_each_entry(prog, &head->plist, link) { |
660 | if (tc_skip_hw(flags: prog->gen_flags)) |
661 | continue; |
662 | |
663 | tc_cls_common_offload_init(cls_common: &cls_bpf.common, tp, flags: prog->gen_flags, |
664 | extack); |
665 | cls_bpf.command = TC_CLSBPF_OFFLOAD; |
666 | cls_bpf.exts = &prog->exts; |
667 | cls_bpf.prog = add ? prog->filter : NULL; |
668 | cls_bpf.oldprog = add ? NULL : prog->filter; |
669 | cls_bpf.name = prog->bpf_name; |
670 | cls_bpf.exts_integrated = prog->exts_integrated; |
671 | |
672 | err = tc_setup_cb_reoffload(block, tp, add, cb, type: TC_SETUP_CLSBPF, |
673 | type_data: &cls_bpf, cb_priv, flags: &prog->gen_flags, |
674 | in_hw_count: &prog->in_hw_count); |
675 | if (err) |
676 | return err; |
677 | } |
678 | |
679 | return 0; |
680 | } |
681 | |
682 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { |
683 | .kind = "bpf" , |
684 | .owner = THIS_MODULE, |
685 | .classify = cls_bpf_classify, |
686 | .init = cls_bpf_init, |
687 | .destroy = cls_bpf_destroy, |
688 | .get = cls_bpf_get, |
689 | .change = cls_bpf_change, |
690 | .delete = cls_bpf_delete, |
691 | .walk = cls_bpf_walk, |
692 | .reoffload = cls_bpf_reoffload, |
693 | .dump = cls_bpf_dump, |
694 | .bind_class = cls_bpf_bind_class, |
695 | }; |
696 | |
697 | static int __init cls_bpf_init_mod(void) |
698 | { |
699 | return register_tcf_proto_ops(ops: &cls_bpf_ops); |
700 | } |
701 | |
702 | static void __exit cls_bpf_exit_mod(void) |
703 | { |
704 | unregister_tcf_proto_ops(ops: &cls_bpf_ops); |
705 | } |
706 | |
707 | module_init(cls_bpf_init_mod); |
708 | module_exit(cls_bpf_exit_mod); |
709 | |