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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; |
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 | 51 | struct tcf_proto *tp; |
7afe8e4f | 52 | struct rcu_work rwork; |
7d1d65cb DB |
53 | }; |
54 | ||
55 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
56 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 57 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 58 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 59 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
60 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
61 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
62 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
63 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
64 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
65 | }; | |
66 | ||
045efa82 DB |
67 | static int cls_bpf_exec_opcode(int code) |
68 | { | |
69 | switch (code) { | |
70 | case TC_ACT_OK: | |
045efa82 | 71 | case TC_ACT_SHOT: |
045efa82 | 72 | case TC_ACT_STOLEN: |
e25ea21f | 73 | case TC_ACT_TRAP: |
27b29f63 | 74 | case TC_ACT_REDIRECT: |
045efa82 DB |
75 | case TC_ACT_UNSPEC: |
76 | return code; | |
77 | default: | |
78 | return TC_ACT_UNSPEC; | |
79 | } | |
80 | } | |
81 | ||
7d1d65cb DB |
82 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
83 | struct tcf_result *res) | |
84 | { | |
80dcbd12 | 85 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 86 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 87 | struct cls_bpf_prog *prog; |
54720df1 | 88 | int ret = -1; |
7d1d65cb | 89 | |
54720df1 DB |
90 | /* Needed here for accessing maps. */ |
91 | rcu_read_lock(); | |
1f947bf1 | 92 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
93 | int filter_res; |
94 | ||
045efa82 DB |
95 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
96 | ||
eadb4148 JK |
97 | if (tc_skip_sw(prog->gen_flags)) { |
98 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
99 | } else if (at_ingress) { | |
3431205e AS |
100 | /* It is safe to push/pull even if skb_shared() */ |
101 | __skb_push(skb, skb->mac_len); | |
6aaae2b6 | 102 | bpf_compute_data_pointers(skb); |
3431205e AS |
103 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
104 | __skb_pull(skb, skb->mac_len); | |
105 | } else { | |
6aaae2b6 | 106 | bpf_compute_data_pointers(skb); |
3431205e AS |
107 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
108 | } | |
7d1d65cb | 109 | |
045efa82 | 110 | if (prog->exts_integrated) { |
3a461da1 DB |
111 | res->class = 0; |
112 | res->classid = TC_H_MAJ(prog->res.classid) | | |
113 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
114 | |
115 | ret = cls_bpf_exec_opcode(filter_res); | |
116 | if (ret == TC_ACT_UNSPEC) | |
117 | continue; | |
118 | break; | |
119 | } | |
120 | ||
7d1d65cb DB |
121 | if (filter_res == 0) |
122 | continue; | |
3a461da1 DB |
123 | if (filter_res != -1) { |
124 | res->class = 0; | |
7d1d65cb | 125 | res->classid = filter_res; |
3a461da1 DB |
126 | } else { |
127 | *res = prog->res; | |
128 | } | |
7d1d65cb DB |
129 | |
130 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
131 | if (ret < 0) | |
132 | continue; | |
133 | ||
54720df1 | 134 | break; |
7d1d65cb | 135 | } |
54720df1 | 136 | rcu_read_unlock(); |
7d1d65cb | 137 | |
54720df1 | 138 | return ret; |
7d1d65cb DB |
139 | } |
140 | ||
e2e9b654 DB |
141 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
142 | { | |
143 | return !prog->bpf_ops; | |
144 | } | |
145 | ||
332ae8e2 | 146 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
102740bd | 147 | struct cls_bpf_prog *oldprog) |
332ae8e2 | 148 | { |
3f7889c4 | 149 | struct tcf_block *block = tp->chain->block; |
de4784ca | 150 | struct tc_cls_bpf_offload cls_bpf = {}; |
102740bd JK |
151 | struct cls_bpf_prog *obj; |
152 | bool skip_sw; | |
5cecb6cc | 153 | int err; |
332ae8e2 | 154 | |
102740bd JK |
155 | skip_sw = prog && tc_skip_sw(prog->gen_flags); |
156 | obj = prog ?: oldprog; | |
157 | ||
de4784ca | 158 | tc_cls_common_offload_init(&cls_bpf.common, tp); |
102740bd JK |
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 | cls_bpf.gen_flags = obj->gen_flags; | |
332ae8e2 | 166 | |
3f7889c4 | 167 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); |
102740bd | 168 | if (prog) { |
3f7889c4 | 169 | if (err < 0) { |
102740bd | 170 | cls_bpf_offload_cmd(tp, oldprog, prog); |
3f7889c4 JP |
171 | return err; |
172 | } else if (err > 0) { | |
173 | prog->gen_flags |= TCA_CLS_FLAGS_IN_HW; | |
174 | } | |
175 | } | |
176 | ||
102740bd | 177 | if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) |
3f7889c4 | 178 | return -EINVAL; |
5cecb6cc | 179 | |
3f7889c4 | 180 | return 0; |
332ae8e2 JK |
181 | } |
182 | ||
ad9294db DB |
183 | static u32 cls_bpf_flags(u32 flags) |
184 | { | |
185 | return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; | |
186 | } | |
187 | ||
eadb4148 JK |
188 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
189 | struct cls_bpf_prog *oldprog) | |
332ae8e2 | 190 | { |
ad9294db DB |
191 | if (prog && oldprog && |
192 | cls_bpf_flags(prog->gen_flags) != | |
193 | cls_bpf_flags(oldprog->gen_flags)) | |
102740bd | 194 | return -EINVAL; |
332ae8e2 | 195 | |
102740bd JK |
196 | if (prog && tc_skip_hw(prog->gen_flags)) |
197 | prog = NULL; | |
198 | if (oldprog && tc_skip_hw(oldprog->gen_flags)) | |
199 | oldprog = NULL; | |
200 | if (!prog && !oldprog) | |
201 | return 0; | |
eadb4148 | 202 | |
102740bd | 203 | return cls_bpf_offload_cmd(tp, prog, oldprog); |
332ae8e2 JK |
204 | } |
205 | ||
206 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
207 | struct cls_bpf_prog *prog) | |
208 | { | |
209 | int err; | |
210 | ||
102740bd JK |
211 | err = cls_bpf_offload_cmd(tp, NULL, prog); |
212 | if (err) | |
332ae8e2 | 213 | pr_err("Stopping hardware offload failed: %d\n", err); |
332ae8e2 JK |
214 | } |
215 | ||
68d64063 JK |
216 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
217 | struct cls_bpf_prog *prog) | |
218 | { | |
102740bd JK |
219 | struct tcf_block *block = tp->chain->block; |
220 | struct tc_cls_bpf_offload cls_bpf = {}; | |
221 | ||
222 | tc_cls_common_offload_init(&cls_bpf.common, tp); | |
223 | cls_bpf.command = TC_CLSBPF_STATS; | |
224 | cls_bpf.exts = &prog->exts; | |
225 | cls_bpf.prog = prog->filter; | |
226 | cls_bpf.name = prog->bpf_name; | |
227 | cls_bpf.exts_integrated = prog->exts_integrated; | |
228 | cls_bpf.gen_flags = prog->gen_flags; | |
68d64063 | 229 | |
102740bd | 230 | tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, false); |
68d64063 JK |
231 | } |
232 | ||
7d1d65cb DB |
233 | static int cls_bpf_init(struct tcf_proto *tp) |
234 | { | |
235 | struct cls_bpf_head *head; | |
236 | ||
237 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
238 | if (head == NULL) | |
239 | return -ENOBUFS; | |
240 | ||
1f947bf1 | 241 | INIT_LIST_HEAD_RCU(&head->plist); |
76cf546c | 242 | idr_init(&head->handle_idr); |
1f947bf1 | 243 | rcu_assign_pointer(tp->root, head); |
7d1d65cb DB |
244 | |
245 | return 0; | |
246 | } | |
247 | ||
25415cec | 248 | static void cls_bpf_free_parms(struct cls_bpf_prog *prog) |
7d1d65cb | 249 | { |
e2e9b654 DB |
250 | if (cls_bpf_is_ebpf(prog)) |
251 | bpf_prog_put(prog->filter); | |
252 | else | |
253 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 254 | |
e2e9b654 | 255 | kfree(prog->bpf_name); |
7d1d65cb | 256 | kfree(prog->bpf_ops); |
25415cec JK |
257 | } |
258 | ||
259 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) | |
260 | { | |
261 | tcf_exts_destroy(&prog->exts); | |
262 | tcf_exts_put_net(&prog->exts); | |
263 | ||
264 | cls_bpf_free_parms(prog); | |
7d1d65cb DB |
265 | kfree(prog); |
266 | } | |
267 | ||
e910af67 CW |
268 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
269 | { | |
7afe8e4f CW |
270 | struct cls_bpf_prog *prog = container_of(to_rcu_work(work), |
271 | struct cls_bpf_prog, | |
272 | rwork); | |
e910af67 CW |
273 | rtnl_lock(); |
274 | __cls_bpf_delete_prog(prog); | |
275 | rtnl_unlock(); | |
276 | } | |
277 | ||
8d829bdb | 278 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog) |
7d1d65cb | 279 | { |
76cf546c CW |
280 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
281 | ||
282 | idr_remove_ext(&head->handle_idr, prog->handle); | |
332ae8e2 | 283 | cls_bpf_stop_offload(tp, prog); |
472f5837 JP |
284 | list_del_rcu(&prog->link); |
285 | tcf_unbind_filter(tp, &prog->res); | |
aae2c35e | 286 | if (tcf_exts_get_net(&prog->exts)) |
7afe8e4f | 287 | tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); |
aae2c35e CW |
288 | else |
289 | __cls_bpf_delete_prog(prog); | |
8d829bdb | 290 | } |
e2e9b654 | 291 | |
8113c095 | 292 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last) |
8d829bdb | 293 | { |
763dbf63 WC |
294 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
295 | ||
8113c095 | 296 | __cls_bpf_delete(tp, arg); |
763dbf63 | 297 | *last = list_empty(&head->plist); |
472f5837 | 298 | return 0; |
7d1d65cb DB |
299 | } |
300 | ||
763dbf63 | 301 | static void cls_bpf_destroy(struct tcf_proto *tp) |
7d1d65cb | 302 | { |
1f947bf1 | 303 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
304 | struct cls_bpf_prog *prog, *tmp; |
305 | ||
8d829bdb DB |
306 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
307 | __cls_bpf_delete(tp, prog); | |
7d1d65cb | 308 | |
76cf546c | 309 | idr_destroy(&head->handle_idr); |
1f947bf1 | 310 | kfree_rcu(head, rcu); |
7d1d65cb DB |
311 | } |
312 | ||
8113c095 | 313 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
7d1d65cb | 314 | { |
1f947bf1 | 315 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb | 316 | struct cls_bpf_prog *prog; |
7d1d65cb | 317 | |
3fe6b49e | 318 | list_for_each_entry(prog, &head->plist, link) { |
8113c095 WC |
319 | if (prog->handle == handle) |
320 | return prog; | |
7d1d65cb DB |
321 | } |
322 | ||
8113c095 | 323 | return NULL; |
7d1d65cb DB |
324 | } |
325 | ||
045efa82 | 326 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 327 | { |
1f947bf1 | 328 | struct sock_filter *bpf_ops; |
e2e9b654 | 329 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 330 | struct bpf_prog *fp; |
33e9fcc6 | 331 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
332 | int ret; |
333 | ||
33e9fcc6 | 334 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
335 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
336 | return -EINVAL; | |
7d1d65cb | 337 | |
33e9fcc6 | 338 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
339 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
340 | return -EINVAL; | |
7913ecf6 | 341 | |
7d1d65cb | 342 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
343 | if (bpf_ops == NULL) |
344 | return -ENOMEM; | |
7d1d65cb DB |
345 | |
346 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
347 | ||
e2e9b654 DB |
348 | fprog_tmp.len = bpf_num_ops; |
349 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 350 | |
e2e9b654 DB |
351 | ret = bpf_prog_create(&fp, &fprog_tmp); |
352 | if (ret < 0) { | |
353 | kfree(bpf_ops); | |
354 | return ret; | |
355 | } | |
7d1d65cb | 356 | |
7d1d65cb | 357 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
358 | prog->bpf_num_ops = bpf_num_ops; |
359 | prog->bpf_name = NULL; | |
7d1d65cb | 360 | prog->filter = fp; |
7d1d65cb | 361 | |
e2e9b654 DB |
362 | return 0; |
363 | } | |
364 | ||
c46646d0 | 365 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
6c8dfe21 | 366 | u32 gen_flags, const struct tcf_proto *tp) |
e2e9b654 DB |
367 | { |
368 | struct bpf_prog *fp; | |
369 | char *name = NULL; | |
288b3de5 | 370 | bool skip_sw; |
e2e9b654 DB |
371 | u32 bpf_fd; |
372 | ||
373 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
288b3de5 | 374 | skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; |
e2e9b654 | 375 | |
288b3de5 | 376 | fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); |
e2e9b654 DB |
377 | if (IS_ERR(fp)) |
378 | return PTR_ERR(fp); | |
379 | ||
e2e9b654 | 380 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 381 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
382 | if (!name) { |
383 | bpf_prog_put(fp); | |
384 | return -ENOMEM; | |
385 | } | |
386 | } | |
387 | ||
388 | prog->bpf_ops = NULL; | |
e2e9b654 | 389 | prog->bpf_name = name; |
e2e9b654 | 390 | prog->filter = fp; |
e2e9b654 | 391 | |
1f211a1b | 392 | if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS)) |
c46646d0 DB |
393 | netif_keep_dst(qdisc_dev(tp->q)); |
394 | ||
e2e9b654 DB |
395 | return 0; |
396 | } | |
397 | ||
6a725c48 JP |
398 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
399 | struct cls_bpf_prog *prog, unsigned long base, | |
400 | struct nlattr **tb, struct nlattr *est, bool ovr) | |
e2e9b654 | 401 | { |
045efa82 | 402 | bool is_bpf, is_ebpf, have_exts = false; |
0d01d45f | 403 | u32 gen_flags = 0; |
e2e9b654 DB |
404 | int ret; |
405 | ||
406 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
407 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 408 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
409 | return -EINVAL; |
410 | ||
6839da32 | 411 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr); |
e2e9b654 DB |
412 | if (ret < 0) |
413 | return ret; | |
414 | ||
045efa82 DB |
415 | if (tb[TCA_BPF_FLAGS]) { |
416 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
417 | ||
6839da32 JP |
418 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
419 | return -EINVAL; | |
045efa82 DB |
420 | |
421 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
422 | } | |
0d01d45f JK |
423 | if (tb[TCA_BPF_FLAGS_GEN]) { |
424 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
425 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
6839da32 JP |
426 | !tc_flags_valid(gen_flags)) |
427 | return -EINVAL; | |
0d01d45f | 428 | } |
045efa82 | 429 | |
045efa82 | 430 | prog->exts_integrated = have_exts; |
0d01d45f | 431 | prog->gen_flags = gen_flags; |
e2e9b654 | 432 | |
045efa82 | 433 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
6c8dfe21 | 434 | cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); |
b9a24bb7 | 435 | if (ret < 0) |
6839da32 | 436 | return ret; |
e2e9b654 | 437 | |
ef146fa4 DB |
438 | if (tb[TCA_BPF_CLASSID]) { |
439 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
440 | tcf_bind_filter(tp, &prog->res, base); | |
441 | } | |
7d1d65cb | 442 | |
7d1d65cb | 443 | return 0; |
7d1d65cb DB |
444 | } |
445 | ||
7d1d65cb DB |
446 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, |
447 | struct tcf_proto *tp, unsigned long base, | |
448 | u32 handle, struct nlattr **tca, | |
8113c095 | 449 | void **arg, bool ovr) |
7d1d65cb | 450 | { |
1f947bf1 | 451 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
8113c095 | 452 | struct cls_bpf_prog *oldprog = *arg; |
7d1d65cb | 453 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 454 | struct cls_bpf_prog *prog; |
76cf546c | 455 | unsigned long idr_index; |
7d1d65cb DB |
456 | int ret; |
457 | ||
458 | if (tca[TCA_OPTIONS] == NULL) | |
459 | return -EINVAL; | |
460 | ||
fceb6435 JB |
461 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
462 | NULL); | |
7d1d65cb DB |
463 | if (ret < 0) |
464 | return ret; | |
465 | ||
7d1d65cb | 466 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 467 | if (!prog) |
7d1d65cb DB |
468 | return -ENOBUFS; |
469 | ||
fb6ad63b | 470 | ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); |
b9a24bb7 WC |
471 | if (ret < 0) |
472 | goto errout; | |
1f947bf1 JF |
473 | |
474 | if (oldprog) { | |
475 | if (handle && oldprog->handle != handle) { | |
476 | ret = -EINVAL; | |
477 | goto errout; | |
478 | } | |
479 | } | |
480 | ||
76cf546c CW |
481 | if (handle == 0) { |
482 | ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index, | |
483 | 1, 0x7FFFFFFF, GFP_KERNEL); | |
484 | if (ret) | |
485 | goto errout; | |
486 | prog->handle = idr_index; | |
487 | } else { | |
488 | if (!oldprog) { | |
489 | ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index, | |
490 | handle, handle + 1, GFP_KERNEL); | |
491 | if (ret) | |
492 | goto errout; | |
493 | } | |
7d1d65cb | 494 | prog->handle = handle; |
7d1d65cb DB |
495 | } |
496 | ||
6a725c48 | 497 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr); |
7d1d65cb | 498 | if (ret < 0) |
76cf546c | 499 | goto errout_idr; |
7d1d65cb | 500 | |
eadb4148 | 501 | ret = cls_bpf_offload(tp, prog, oldprog); |
25415cec JK |
502 | if (ret) |
503 | goto errout_parms; | |
332ae8e2 | 504 | |
5cecb6cc OG |
505 | if (!tc_in_hw(prog->gen_flags)) |
506 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
507 | ||
1f947bf1 | 508 | if (oldprog) { |
76cf546c | 509 | idr_replace_ext(&head->handle_idr, prog, handle); |
f6bfc46d | 510 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 511 | tcf_unbind_filter(tp, &oldprog->res); |
aae2c35e | 512 | tcf_exts_get_net(&oldprog->exts); |
7afe8e4f | 513 | tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); |
1f947bf1 JF |
514 | } else { |
515 | list_add_rcu(&prog->link, &head->plist); | |
516 | } | |
7d1d65cb | 517 | |
8113c095 | 518 | *arg = prog; |
7d1d65cb | 519 | return 0; |
b9a24bb7 | 520 | |
25415cec JK |
521 | errout_parms: |
522 | cls_bpf_free_parms(prog); | |
76cf546c CW |
523 | errout_idr: |
524 | if (!oldprog) | |
525 | idr_remove_ext(&head->handle_idr, prog->handle); | |
7d1d65cb | 526 | errout: |
b9a24bb7 | 527 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 528 | kfree(prog); |
7d1d65cb DB |
529 | return ret; |
530 | } | |
531 | ||
e2e9b654 DB |
532 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
533 | struct sk_buff *skb) | |
534 | { | |
535 | struct nlattr *nla; | |
536 | ||
537 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
538 | return -EMSGSIZE; | |
539 | ||
540 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
541 | sizeof(struct sock_filter)); | |
542 | if (nla == NULL) | |
543 | return -EMSGSIZE; | |
544 | ||
545 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
551 | struct sk_buff *skb) | |
552 | { | |
7bd509e3 DB |
553 | struct nlattr *nla; |
554 | ||
e2e9b654 DB |
555 | if (prog->bpf_name && |
556 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
557 | return -EMSGSIZE; | |
558 | ||
e8628307 DB |
559 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
560 | return -EMSGSIZE; | |
561 | ||
f1f7714e | 562 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
563 | if (nla == NULL) |
564 | return -EMSGSIZE; | |
565 | ||
f1f7714e | 566 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 567 | |
e2e9b654 DB |
568 | return 0; |
569 | } | |
570 | ||
8113c095 | 571 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
7d1d65cb DB |
572 | struct sk_buff *skb, struct tcmsg *tm) |
573 | { | |
8113c095 | 574 | struct cls_bpf_prog *prog = fh; |
e2e9b654 | 575 | struct nlattr *nest; |
bf007d1c | 576 | u32 bpf_flags = 0; |
e2e9b654 | 577 | int ret; |
7d1d65cb DB |
578 | |
579 | if (prog == NULL) | |
580 | return skb->len; | |
581 | ||
582 | tm->tcm_handle = prog->handle; | |
583 | ||
68d64063 JK |
584 | cls_bpf_offload_update_stats(tp, prog); |
585 | ||
7d1d65cb DB |
586 | nest = nla_nest_start(skb, TCA_OPTIONS); |
587 | if (nest == NULL) | |
588 | goto nla_put_failure; | |
589 | ||
ef146fa4 DB |
590 | if (prog->res.classid && |
591 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 592 | goto nla_put_failure; |
7d1d65cb | 593 | |
e2e9b654 DB |
594 | if (cls_bpf_is_ebpf(prog)) |
595 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
596 | else | |
597 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
598 | if (ret) | |
7d1d65cb DB |
599 | goto nla_put_failure; |
600 | ||
5da57f42 | 601 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
602 | goto nla_put_failure; |
603 | ||
bf007d1c DB |
604 | if (prog->exts_integrated) |
605 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
606 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
607 | goto nla_put_failure; | |
0d01d45f JK |
608 | if (prog->gen_flags && |
609 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
610 | goto nla_put_failure; | |
bf007d1c | 611 | |
7d1d65cb DB |
612 | nla_nest_end(skb, nest); |
613 | ||
5da57f42 | 614 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
615 | goto nla_put_failure; |
616 | ||
617 | return skb->len; | |
618 | ||
619 | nla_put_failure: | |
620 | nla_nest_cancel(skb, nest); | |
621 | return -1; | |
622 | } | |
623 | ||
07d79fc7 CW |
624 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) |
625 | { | |
626 | struct cls_bpf_prog *prog = fh; | |
627 | ||
628 | if (prog && prog->res.classid == classid) | |
629 | prog->res.class = cl; | |
630 | } | |
631 | ||
7d1d65cb DB |
632 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
633 | { | |
1f947bf1 | 634 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
635 | struct cls_bpf_prog *prog; |
636 | ||
3fe6b49e | 637 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
638 | if (arg->count < arg->skip) |
639 | goto skip; | |
8113c095 | 640 | if (arg->fn(tp, prog, arg) < 0) { |
7d1d65cb DB |
641 | arg->stop = 1; |
642 | break; | |
643 | } | |
644 | skip: | |
645 | arg->count++; | |
646 | } | |
647 | } | |
648 | ||
649 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
650 | .kind = "bpf", | |
651 | .owner = THIS_MODULE, | |
652 | .classify = cls_bpf_classify, | |
653 | .init = cls_bpf_init, | |
654 | .destroy = cls_bpf_destroy, | |
655 | .get = cls_bpf_get, | |
7d1d65cb DB |
656 | .change = cls_bpf_change, |
657 | .delete = cls_bpf_delete, | |
658 | .walk = cls_bpf_walk, | |
659 | .dump = cls_bpf_dump, | |
07d79fc7 | 660 | .bind_class = cls_bpf_bind_class, |
7d1d65cb DB |
661 | }; |
662 | ||
663 | static int __init cls_bpf_init_mod(void) | |
664 | { | |
665 | return register_tcf_proto_ops(&cls_bpf_ops); | |
666 | } | |
667 | ||
668 | static void __exit cls_bpf_exit_mod(void) | |
669 | { | |
670 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
671 | } | |
672 | ||
673 | module_init(cls_bpf_init_mod); | |
674 | module_exit(cls_bpf_exit_mod); |