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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 | 19 | #include <linux/bpf.h> |
76cf546c | 20 | #include <linux/idr.h> |
e2e9b654 | 21 | |
7d1d65cb DB |
22 | #include <net/rtnetlink.h> |
23 | #include <net/pkt_cls.h> | |
24 | #include <net/sock.h> | |
25 | ||
26 | MODULE_LICENSE("GPL"); | |
27 | MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); | |
28 | MODULE_DESCRIPTION("TC BPF based classifier"); | |
29 | ||
e2e9b654 | 30 | #define CLS_BPF_NAME_LEN 256 |
0d01d45f | 31 | #define CLS_BPF_SUPPORTED_GEN_FLAGS \ |
eadb4148 | 32 | (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) |
e2e9b654 | 33 | |
7d1d65cb DB |
34 | struct cls_bpf_head { |
35 | struct list_head plist; | |
76cf546c | 36 | struct idr handle_idr; |
1f947bf1 | 37 | struct rcu_head rcu; |
7d1d65cb DB |
38 | }; |
39 | ||
40 | struct cls_bpf_prog { | |
7ae457c1 | 41 | struct bpf_prog *filter; |
7d1d65cb | 42 | struct list_head link; |
e2e9b654 | 43 | struct tcf_result res; |
045efa82 | 44 | bool exts_integrated; |
332ae8e2 | 45 | bool offloaded; |
0d01d45f | 46 | u32 gen_flags; |
e2e9b654 | 47 | struct tcf_exts exts; |
7d1d65cb | 48 | u32 handle; |
55556dd5 | 49 | u16 bpf_num_ops; |
e2e9b654 DB |
50 | struct sock_filter *bpf_ops; |
51 | const char *bpf_name; | |
1f947bf1 | 52 | struct tcf_proto *tp; |
e910af67 CW |
53 | union { |
54 | struct work_struct work; | |
55 | struct rcu_head rcu; | |
56 | }; | |
7d1d65cb DB |
57 | }; |
58 | ||
59 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
60 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 61 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 62 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 63 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
64 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
65 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
66 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
67 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
68 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
69 | }; | |
70 | ||
045efa82 DB |
71 | static int cls_bpf_exec_opcode(int code) |
72 | { | |
73 | switch (code) { | |
74 | case TC_ACT_OK: | |
045efa82 | 75 | case TC_ACT_SHOT: |
045efa82 | 76 | case TC_ACT_STOLEN: |
e25ea21f | 77 | case TC_ACT_TRAP: |
27b29f63 | 78 | case TC_ACT_REDIRECT: |
045efa82 DB |
79 | case TC_ACT_UNSPEC: |
80 | return code; | |
81 | default: | |
82 | return TC_ACT_UNSPEC; | |
83 | } | |
84 | } | |
85 | ||
7d1d65cb DB |
86 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
87 | struct tcf_result *res) | |
88 | { | |
80dcbd12 | 89 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 90 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 91 | struct cls_bpf_prog *prog; |
54720df1 | 92 | int ret = -1; |
7d1d65cb | 93 | |
54720df1 DB |
94 | /* Needed here for accessing maps. */ |
95 | rcu_read_lock(); | |
1f947bf1 | 96 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
97 | int filter_res; |
98 | ||
045efa82 DB |
99 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
100 | ||
eadb4148 JK |
101 | if (tc_skip_sw(prog->gen_flags)) { |
102 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
103 | } else if (at_ingress) { | |
3431205e AS |
104 | /* It is safe to push/pull even if skb_shared() */ |
105 | __skb_push(skb, skb->mac_len); | |
6aaae2b6 | 106 | bpf_compute_data_pointers(skb); |
3431205e AS |
107 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
108 | __skb_pull(skb, skb->mac_len); | |
109 | } else { | |
6aaae2b6 | 110 | bpf_compute_data_pointers(skb); |
3431205e AS |
111 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
112 | } | |
7d1d65cb | 113 | |
045efa82 | 114 | if (prog->exts_integrated) { |
3a461da1 DB |
115 | res->class = 0; |
116 | res->classid = TC_H_MAJ(prog->res.classid) | | |
117 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
118 | |
119 | ret = cls_bpf_exec_opcode(filter_res); | |
120 | if (ret == TC_ACT_UNSPEC) | |
121 | continue; | |
122 | break; | |
123 | } | |
124 | ||
7d1d65cb DB |
125 | if (filter_res == 0) |
126 | continue; | |
3a461da1 DB |
127 | if (filter_res != -1) { |
128 | res->class = 0; | |
7d1d65cb | 129 | res->classid = filter_res; |
3a461da1 DB |
130 | } else { |
131 | *res = prog->res; | |
132 | } | |
7d1d65cb DB |
133 | |
134 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
135 | if (ret < 0) | |
136 | continue; | |
137 | ||
54720df1 | 138 | break; |
7d1d65cb | 139 | } |
54720df1 | 140 | rcu_read_unlock(); |
7d1d65cb | 141 | |
54720df1 | 142 | return ret; |
7d1d65cb DB |
143 | } |
144 | ||
e2e9b654 DB |
145 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
146 | { | |
147 | return !prog->bpf_ops; | |
148 | } | |
149 | ||
332ae8e2 JK |
150 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
151 | enum tc_clsbpf_command cmd) | |
152 | { | |
3f7889c4 | 153 | bool addorrep = cmd == TC_CLSBPF_ADD || cmd == TC_CLSBPF_REPLACE; |
3f7889c4 JP |
154 | struct tcf_block *block = tp->chain->block; |
155 | bool skip_sw = tc_skip_sw(prog->gen_flags); | |
de4784ca | 156 | struct tc_cls_bpf_offload cls_bpf = {}; |
5cecb6cc | 157 | int err; |
332ae8e2 | 158 | |
de4784ca JP |
159 | tc_cls_common_offload_init(&cls_bpf.common, tp); |
160 | cls_bpf.command = cmd; | |
161 | cls_bpf.exts = &prog->exts; | |
162 | cls_bpf.prog = prog->filter; | |
163 | cls_bpf.name = prog->bpf_name; | |
164 | cls_bpf.exts_integrated = prog->exts_integrated; | |
165 | cls_bpf.gen_flags = prog->gen_flags; | |
332ae8e2 | 166 | |
3f7889c4 JP |
167 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); |
168 | if (addorrep) { | |
169 | if (err < 0) { | |
170 | cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY); | |
171 | return err; | |
172 | } else if (err > 0) { | |
173 | prog->gen_flags |= TCA_CLS_FLAGS_IN_HW; | |
174 | } | |
175 | } | |
176 | ||
53b3847b | 177 | if (addorrep && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) |
3f7889c4 | 178 | return -EINVAL; |
5cecb6cc | 179 | |
3f7889c4 | 180 | return 0; |
332ae8e2 JK |
181 | } |
182 | ||
eadb4148 JK |
183 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
184 | struct cls_bpf_prog *oldprog) | |
332ae8e2 | 185 | { |
332ae8e2 JK |
186 | struct cls_bpf_prog *obj = prog; |
187 | enum tc_clsbpf_command cmd; | |
eadb4148 JK |
188 | bool skip_sw; |
189 | int ret; | |
190 | ||
191 | skip_sw = tc_skip_sw(prog->gen_flags) || | |
192 | (oldprog && tc_skip_sw(oldprog->gen_flags)); | |
332ae8e2 JK |
193 | |
194 | if (oldprog && oldprog->offloaded) { | |
3f7889c4 | 195 | if (!tc_skip_hw(prog->gen_flags)) { |
332ae8e2 | 196 | cmd = TC_CLSBPF_REPLACE; |
eadb4148 | 197 | } else if (!tc_skip_sw(prog->gen_flags)) { |
332ae8e2 JK |
198 | obj = oldprog; |
199 | cmd = TC_CLSBPF_DESTROY; | |
eadb4148 JK |
200 | } else { |
201 | return -EINVAL; | |
332ae8e2 JK |
202 | } |
203 | } else { | |
3f7889c4 | 204 | if (tc_skip_hw(prog->gen_flags)) |
eadb4148 | 205 | return skip_sw ? -EINVAL : 0; |
332ae8e2 JK |
206 | cmd = TC_CLSBPF_ADD; |
207 | } | |
208 | ||
eadb4148 JK |
209 | ret = cls_bpf_offload_cmd(tp, obj, cmd); |
210 | if (ret) | |
3f7889c4 | 211 | return ret; |
332ae8e2 JK |
212 | |
213 | obj->offloaded = true; | |
214 | if (oldprog) | |
215 | oldprog->offloaded = false; | |
eadb4148 JK |
216 | |
217 | return 0; | |
332ae8e2 JK |
218 | } |
219 | ||
220 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
221 | struct cls_bpf_prog *prog) | |
222 | { | |
223 | int err; | |
224 | ||
225 | if (!prog->offloaded) | |
226 | return; | |
227 | ||
228 | err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY); | |
229 | if (err) { | |
230 | pr_err("Stopping hardware offload failed: %d\n", err); | |
231 | return; | |
232 | } | |
233 | ||
234 | prog->offloaded = false; | |
235 | } | |
236 | ||
68d64063 JK |
237 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
238 | struct cls_bpf_prog *prog) | |
239 | { | |
240 | if (!prog->offloaded) | |
241 | return; | |
242 | ||
243 | cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS); | |
244 | } | |
245 | ||
7d1d65cb DB |
246 | static int cls_bpf_init(struct tcf_proto *tp) |
247 | { | |
248 | struct cls_bpf_head *head; | |
249 | ||
250 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
251 | if (head == NULL) | |
252 | return -ENOBUFS; | |
253 | ||
1f947bf1 | 254 | INIT_LIST_HEAD_RCU(&head->plist); |
76cf546c | 255 | idr_init(&head->handle_idr); |
1f947bf1 | 256 | rcu_assign_pointer(tp->root, head); |
7d1d65cb DB |
257 | |
258 | return 0; | |
259 | } | |
260 | ||
8d829bdb | 261 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) |
7d1d65cb | 262 | { |
18d0264f | 263 | tcf_exts_destroy(&prog->exts); |
aae2c35e | 264 | tcf_exts_put_net(&prog->exts); |
7d1d65cb | 265 | |
e2e9b654 DB |
266 | if (cls_bpf_is_ebpf(prog)) |
267 | bpf_prog_put(prog->filter); | |
268 | else | |
269 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 270 | |
e2e9b654 | 271 | kfree(prog->bpf_name); |
7d1d65cb DB |
272 | kfree(prog->bpf_ops); |
273 | kfree(prog); | |
274 | } | |
275 | ||
e910af67 CW |
276 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
277 | { | |
278 | struct cls_bpf_prog *prog = container_of(work, struct cls_bpf_prog, work); | |
279 | ||
280 | rtnl_lock(); | |
281 | __cls_bpf_delete_prog(prog); | |
282 | rtnl_unlock(); | |
283 | } | |
284 | ||
8d829bdb | 285 | static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu) |
1f947bf1 | 286 | { |
e910af67 CW |
287 | struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu); |
288 | ||
289 | INIT_WORK(&prog->work, cls_bpf_delete_prog_work); | |
290 | tcf_queue_work(&prog->work); | |
1f947bf1 JF |
291 | } |
292 | ||
8d829bdb | 293 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog) |
7d1d65cb | 294 | { |
76cf546c CW |
295 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
296 | ||
297 | idr_remove_ext(&head->handle_idr, prog->handle); | |
332ae8e2 | 298 | cls_bpf_stop_offload(tp, prog); |
472f5837 JP |
299 | list_del_rcu(&prog->link); |
300 | tcf_unbind_filter(tp, &prog->res); | |
aae2c35e CW |
301 | if (tcf_exts_get_net(&prog->exts)) |
302 | call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu); | |
303 | else | |
304 | __cls_bpf_delete_prog(prog); | |
8d829bdb | 305 | } |
e2e9b654 | 306 | |
8113c095 | 307 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last) |
8d829bdb | 308 | { |
763dbf63 WC |
309 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
310 | ||
8113c095 | 311 | __cls_bpf_delete(tp, arg); |
763dbf63 | 312 | *last = list_empty(&head->plist); |
472f5837 | 313 | return 0; |
7d1d65cb DB |
314 | } |
315 | ||
763dbf63 | 316 | static void cls_bpf_destroy(struct tcf_proto *tp) |
7d1d65cb | 317 | { |
1f947bf1 | 318 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
319 | struct cls_bpf_prog *prog, *tmp; |
320 | ||
8d829bdb DB |
321 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
322 | __cls_bpf_delete(tp, prog); | |
7d1d65cb | 323 | |
76cf546c | 324 | idr_destroy(&head->handle_idr); |
1f947bf1 | 325 | kfree_rcu(head, rcu); |
7d1d65cb DB |
326 | } |
327 | ||
8113c095 | 328 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
7d1d65cb | 329 | { |
1f947bf1 | 330 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb | 331 | struct cls_bpf_prog *prog; |
7d1d65cb | 332 | |
3fe6b49e | 333 | list_for_each_entry(prog, &head->plist, link) { |
8113c095 WC |
334 | if (prog->handle == handle) |
335 | return prog; | |
7d1d65cb DB |
336 | } |
337 | ||
8113c095 | 338 | return NULL; |
7d1d65cb DB |
339 | } |
340 | ||
045efa82 | 341 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 342 | { |
1f947bf1 | 343 | struct sock_filter *bpf_ops; |
e2e9b654 | 344 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 345 | struct bpf_prog *fp; |
33e9fcc6 | 346 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
347 | int ret; |
348 | ||
33e9fcc6 | 349 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
350 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
351 | return -EINVAL; | |
7d1d65cb | 352 | |
33e9fcc6 | 353 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
354 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
355 | return -EINVAL; | |
7913ecf6 | 356 | |
7d1d65cb | 357 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
358 | if (bpf_ops == NULL) |
359 | return -ENOMEM; | |
7d1d65cb DB |
360 | |
361 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
362 | ||
e2e9b654 DB |
363 | fprog_tmp.len = bpf_num_ops; |
364 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 365 | |
e2e9b654 DB |
366 | ret = bpf_prog_create(&fp, &fprog_tmp); |
367 | if (ret < 0) { | |
368 | kfree(bpf_ops); | |
369 | return ret; | |
370 | } | |
7d1d65cb | 371 | |
7d1d65cb | 372 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
373 | prog->bpf_num_ops = bpf_num_ops; |
374 | prog->bpf_name = NULL; | |
7d1d65cb | 375 | prog->filter = fp; |
7d1d65cb | 376 | |
e2e9b654 DB |
377 | return 0; |
378 | } | |
379 | ||
c46646d0 | 380 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
6c8dfe21 | 381 | u32 gen_flags, const struct tcf_proto *tp) |
e2e9b654 DB |
382 | { |
383 | struct bpf_prog *fp; | |
384 | char *name = NULL; | |
385 | u32 bpf_fd; | |
386 | ||
387 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
388 | ||
6c8dfe21 JK |
389 | if (gen_flags & TCA_CLS_FLAGS_SKIP_SW) |
390 | fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, | |
391 | qdisc_dev(tp->q)); | |
392 | else | |
393 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS); | |
e2e9b654 DB |
394 | if (IS_ERR(fp)) |
395 | return PTR_ERR(fp); | |
396 | ||
e2e9b654 | 397 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 398 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
399 | if (!name) { |
400 | bpf_prog_put(fp); | |
401 | return -ENOMEM; | |
402 | } | |
403 | } | |
404 | ||
405 | prog->bpf_ops = NULL; | |
e2e9b654 | 406 | prog->bpf_name = name; |
e2e9b654 | 407 | prog->filter = fp; |
e2e9b654 | 408 | |
1f211a1b | 409 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
410 | netif_keep_dst(qdisc_dev(tp->q)); |
411 | ||
e2e9b654 DB |
412 | return 0; |
413 | } | |
414 | ||
6a725c48 JP |
415 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
416 | struct cls_bpf_prog *prog, unsigned long base, | |
417 | struct nlattr **tb, struct nlattr *est, bool ovr) | |
e2e9b654 | 418 | { |
045efa82 | 419 | bool is_bpf, is_ebpf, have_exts = false; |
0d01d45f | 420 | u32 gen_flags = 0; |
e2e9b654 DB |
421 | int ret; |
422 | ||
423 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
424 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 425 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
426 | return -EINVAL; |
427 | ||
6839da32 | 428 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr); |
e2e9b654 DB |
429 | if (ret < 0) |
430 | return ret; | |
431 | ||
045efa82 DB |
432 | if (tb[TCA_BPF_FLAGS]) { |
433 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
434 | ||
6839da32 JP |
435 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
436 | return -EINVAL; | |
045efa82 DB |
437 | |
438 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
439 | } | |
0d01d45f JK |
440 | if (tb[TCA_BPF_FLAGS_GEN]) { |
441 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
442 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
6839da32 JP |
443 | !tc_flags_valid(gen_flags)) |
444 | return -EINVAL; | |
0d01d45f | 445 | } |
045efa82 | 446 | |
045efa82 | 447 | prog->exts_integrated = have_exts; |
0d01d45f | 448 | prog->gen_flags = gen_flags; |
e2e9b654 | 449 | |
045efa82 | 450 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
6c8dfe21 | 451 | cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); |
b9a24bb7 | 452 | if (ret < 0) |
6839da32 | 453 | return ret; |
e2e9b654 | 454 | |
ef146fa4 DB |
455 | if (tb[TCA_BPF_CLASSID]) { |
456 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
457 | tcf_bind_filter(tp, &prog->res, base); | |
458 | } | |
7d1d65cb | 459 | |
7d1d65cb | 460 | return 0; |
7d1d65cb DB |
461 | } |
462 | ||
7d1d65cb DB |
463 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, |
464 | struct tcf_proto *tp, unsigned long base, | |
465 | u32 handle, struct nlattr **tca, | |
8113c095 | 466 | void **arg, bool ovr) |
7d1d65cb | 467 | { |
1f947bf1 | 468 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
8113c095 | 469 | struct cls_bpf_prog *oldprog = *arg; |
7d1d65cb | 470 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 471 | struct cls_bpf_prog *prog; |
76cf546c | 472 | unsigned long idr_index; |
7d1d65cb DB |
473 | int ret; |
474 | ||
475 | if (tca[TCA_OPTIONS] == NULL) | |
476 | return -EINVAL; | |
477 | ||
fceb6435 JB |
478 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
479 | NULL); | |
7d1d65cb DB |
480 | if (ret < 0) |
481 | return ret; | |
482 | ||
7d1d65cb | 483 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 484 | if (!prog) |
7d1d65cb DB |
485 | return -ENOBUFS; |
486 | ||
b9a24bb7 WC |
487 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
488 | if (ret < 0) | |
489 | goto errout; | |
1f947bf1 JF |
490 | |
491 | if (oldprog) { | |
492 | if (handle && oldprog->handle != handle) { | |
493 | ret = -EINVAL; | |
494 | goto errout; | |
495 | } | |
496 | } | |
497 | ||
76cf546c CW |
498 | if (handle == 0) { |
499 | ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index, | |
500 | 1, 0x7FFFFFFF, GFP_KERNEL); | |
501 | if (ret) | |
502 | goto errout; | |
503 | prog->handle = idr_index; | |
504 | } else { | |
505 | if (!oldprog) { | |
506 | ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index, | |
507 | handle, handle + 1, GFP_KERNEL); | |
508 | if (ret) | |
509 | goto errout; | |
510 | } | |
7d1d65cb | 511 | prog->handle = handle; |
7d1d65cb DB |
512 | } |
513 | ||
6a725c48 | 514 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr); |
7d1d65cb | 515 | if (ret < 0) |
76cf546c | 516 | goto errout_idr; |
7d1d65cb | 517 | |
eadb4148 JK |
518 | ret = cls_bpf_offload(tp, prog, oldprog); |
519 | if (ret) { | |
76cf546c CW |
520 | if (!oldprog) |
521 | idr_remove_ext(&head->handle_idr, prog->handle); | |
8d829bdb | 522 | __cls_bpf_delete_prog(prog); |
eadb4148 JK |
523 | return ret; |
524 | } | |
332ae8e2 | 525 | |
5cecb6cc OG |
526 | if (!tc_in_hw(prog->gen_flags)) |
527 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
528 | ||
1f947bf1 | 529 | if (oldprog) { |
76cf546c | 530 | idr_replace_ext(&head->handle_idr, prog, handle); |
f6bfc46d | 531 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 532 | tcf_unbind_filter(tp, &oldprog->res); |
aae2c35e | 533 | tcf_exts_get_net(&oldprog->exts); |
8d829bdb | 534 | call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu); |
1f947bf1 JF |
535 | } else { |
536 | list_add_rcu(&prog->link, &head->plist); | |
537 | } | |
7d1d65cb | 538 | |
8113c095 | 539 | *arg = prog; |
7d1d65cb | 540 | return 0; |
b9a24bb7 | 541 | |
76cf546c CW |
542 | errout_idr: |
543 | if (!oldprog) | |
544 | idr_remove_ext(&head->handle_idr, prog->handle); | |
7d1d65cb | 545 | errout: |
b9a24bb7 | 546 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 547 | kfree(prog); |
7d1d65cb DB |
548 | return ret; |
549 | } | |
550 | ||
e2e9b654 DB |
551 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
552 | struct sk_buff *skb) | |
553 | { | |
554 | struct nlattr *nla; | |
555 | ||
556 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
557 | return -EMSGSIZE; | |
558 | ||
559 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
560 | sizeof(struct sock_filter)); | |
561 | if (nla == NULL) | |
562 | return -EMSGSIZE; | |
563 | ||
564 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
570 | struct sk_buff *skb) | |
571 | { | |
7bd509e3 DB |
572 | struct nlattr *nla; |
573 | ||
e2e9b654 DB |
574 | if (prog->bpf_name && |
575 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
576 | return -EMSGSIZE; | |
577 | ||
e8628307 DB |
578 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
579 | return -EMSGSIZE; | |
580 | ||
f1f7714e | 581 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
582 | if (nla == NULL) |
583 | return -EMSGSIZE; | |
584 | ||
f1f7714e | 585 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 586 | |
e2e9b654 DB |
587 | return 0; |
588 | } | |
589 | ||
8113c095 | 590 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
7d1d65cb DB |
591 | struct sk_buff *skb, struct tcmsg *tm) |
592 | { | |
8113c095 | 593 | struct cls_bpf_prog *prog = fh; |
e2e9b654 | 594 | struct nlattr *nest; |
bf007d1c | 595 | u32 bpf_flags = 0; |
e2e9b654 | 596 | int ret; |
7d1d65cb DB |
597 | |
598 | if (prog == NULL) | |
599 | return skb->len; | |
600 | ||
601 | tm->tcm_handle = prog->handle; | |
602 | ||
68d64063 JK |
603 | cls_bpf_offload_update_stats(tp, prog); |
604 | ||
7d1d65cb DB |
605 | nest = nla_nest_start(skb, TCA_OPTIONS); |
606 | if (nest == NULL) | |
607 | goto nla_put_failure; | |
608 | ||
ef146fa4 DB |
609 | if (prog->res.classid && |
610 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 611 | goto nla_put_failure; |
7d1d65cb | 612 | |
e2e9b654 DB |
613 | if (cls_bpf_is_ebpf(prog)) |
614 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
615 | else | |
616 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
617 | if (ret) | |
7d1d65cb DB |
618 | goto nla_put_failure; |
619 | ||
5da57f42 | 620 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
621 | goto nla_put_failure; |
622 | ||
bf007d1c DB |
623 | if (prog->exts_integrated) |
624 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
625 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
626 | goto nla_put_failure; | |
0d01d45f JK |
627 | if (prog->gen_flags && |
628 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
629 | goto nla_put_failure; | |
bf007d1c | 630 | |
7d1d65cb DB |
631 | nla_nest_end(skb, nest); |
632 | ||
5da57f42 | 633 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
634 | goto nla_put_failure; |
635 | ||
636 | return skb->len; | |
637 | ||
638 | nla_put_failure: | |
639 | nla_nest_cancel(skb, nest); | |
640 | return -1; | |
641 | } | |
642 | ||
07d79fc7 CW |
643 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) |
644 | { | |
645 | struct cls_bpf_prog *prog = fh; | |
646 | ||
647 | if (prog && prog->res.classid == classid) | |
648 | prog->res.class = cl; | |
649 | } | |
650 | ||
7d1d65cb DB |
651 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
652 | { | |
1f947bf1 | 653 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
654 | struct cls_bpf_prog *prog; |
655 | ||
3fe6b49e | 656 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
657 | if (arg->count < arg->skip) |
658 | goto skip; | |
8113c095 | 659 | if (arg->fn(tp, prog, arg) < 0) { |
7d1d65cb DB |
660 | arg->stop = 1; |
661 | break; | |
662 | } | |
663 | skip: | |
664 | arg->count++; | |
665 | } | |
666 | } | |
667 | ||
668 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
669 | .kind = "bpf", | |
670 | .owner = THIS_MODULE, | |
671 | .classify = cls_bpf_classify, | |
672 | .init = cls_bpf_init, | |
673 | .destroy = cls_bpf_destroy, | |
674 | .get = cls_bpf_get, | |
7d1d65cb DB |
675 | .change = cls_bpf_change, |
676 | .delete = cls_bpf_delete, | |
677 | .walk = cls_bpf_walk, | |
678 | .dump = cls_bpf_dump, | |
07d79fc7 | 679 | .bind_class = cls_bpf_bind_class, |
7d1d65cb DB |
680 | }; |
681 | ||
682 | static int __init cls_bpf_init_mod(void) | |
683 | { | |
684 | return register_tcf_proto_ops(&cls_bpf_ops); | |
685 | } | |
686 | ||
687 | static void __exit cls_bpf_exit_mod(void) | |
688 | { | |
689 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
690 | } | |
691 | ||
692 | module_init(cls_bpf_init_mod); | |
693 | module_exit(cls_bpf_exit_mod); |