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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; |
e910af67 CW |
52 | union { |
53 | struct work_struct work; | |
54 | struct rcu_head rcu; | |
55 | }; | |
7d1d65cb DB |
56 | }; |
57 | ||
58 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
59 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 60 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 61 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 62 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
63 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
64 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
65 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
66 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
67 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
68 | }; | |
69 | ||
045efa82 DB |
70 | static int cls_bpf_exec_opcode(int code) |
71 | { | |
72 | switch (code) { | |
73 | case TC_ACT_OK: | |
045efa82 | 74 | case TC_ACT_SHOT: |
045efa82 | 75 | case TC_ACT_STOLEN: |
e25ea21f | 76 | case TC_ACT_TRAP: |
27b29f63 | 77 | case TC_ACT_REDIRECT: |
045efa82 DB |
78 | case TC_ACT_UNSPEC: |
79 | return code; | |
80 | default: | |
81 | return TC_ACT_UNSPEC; | |
82 | } | |
83 | } | |
84 | ||
7d1d65cb DB |
85 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
86 | struct tcf_result *res) | |
87 | { | |
80dcbd12 | 88 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 89 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 90 | struct cls_bpf_prog *prog; |
54720df1 | 91 | int ret = -1; |
7d1d65cb | 92 | |
54720df1 DB |
93 | /* Needed here for accessing maps. */ |
94 | rcu_read_lock(); | |
1f947bf1 | 95 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
96 | int filter_res; |
97 | ||
045efa82 DB |
98 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
99 | ||
eadb4148 JK |
100 | if (tc_skip_sw(prog->gen_flags)) { |
101 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
102 | } else if (at_ingress) { | |
3431205e AS |
103 | /* It is safe to push/pull even if skb_shared() */ |
104 | __skb_push(skb, skb->mac_len); | |
6aaae2b6 | 105 | bpf_compute_data_pointers(skb); |
3431205e AS |
106 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
107 | __skb_pull(skb, skb->mac_len); | |
108 | } else { | |
6aaae2b6 | 109 | bpf_compute_data_pointers(skb); |
3431205e AS |
110 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
111 | } | |
7d1d65cb | 112 | |
045efa82 | 113 | if (prog->exts_integrated) { |
3a461da1 DB |
114 | res->class = 0; |
115 | res->classid = TC_H_MAJ(prog->res.classid) | | |
116 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
117 | |
118 | ret = cls_bpf_exec_opcode(filter_res); | |
119 | if (ret == TC_ACT_UNSPEC) | |
120 | continue; | |
121 | break; | |
122 | } | |
123 | ||
7d1d65cb DB |
124 | if (filter_res == 0) |
125 | continue; | |
3a461da1 DB |
126 | if (filter_res != -1) { |
127 | res->class = 0; | |
7d1d65cb | 128 | res->classid = filter_res; |
3a461da1 DB |
129 | } else { |
130 | *res = prog->res; | |
131 | } | |
7d1d65cb DB |
132 | |
133 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
134 | if (ret < 0) | |
135 | continue; | |
136 | ||
54720df1 | 137 | break; |
7d1d65cb | 138 | } |
54720df1 | 139 | rcu_read_unlock(); |
7d1d65cb | 140 | |
54720df1 | 141 | return ret; |
7d1d65cb DB |
142 | } |
143 | ||
e2e9b654 DB |
144 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
145 | { | |
146 | return !prog->bpf_ops; | |
147 | } | |
148 | ||
332ae8e2 | 149 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
102740bd | 150 | struct cls_bpf_prog *oldprog) |
332ae8e2 | 151 | { |
3f7889c4 | 152 | struct tcf_block *block = tp->chain->block; |
de4784ca | 153 | struct tc_cls_bpf_offload cls_bpf = {}; |
102740bd JK |
154 | struct cls_bpf_prog *obj; |
155 | bool skip_sw; | |
5cecb6cc | 156 | int err; |
332ae8e2 | 157 | |
102740bd JK |
158 | skip_sw = prog && tc_skip_sw(prog->gen_flags); |
159 | obj = prog ?: oldprog; | |
160 | ||
de4784ca | 161 | tc_cls_common_offload_init(&cls_bpf.common, tp); |
102740bd JK |
162 | cls_bpf.command = TC_CLSBPF_OFFLOAD; |
163 | cls_bpf.exts = &obj->exts; | |
164 | cls_bpf.prog = prog ? prog->filter : NULL; | |
165 | cls_bpf.oldprog = oldprog ? oldprog->filter : NULL; | |
166 | cls_bpf.name = obj->bpf_name; | |
167 | cls_bpf.exts_integrated = obj->exts_integrated; | |
168 | cls_bpf.gen_flags = obj->gen_flags; | |
332ae8e2 | 169 | |
caa72601 JP |
170 | if (oldprog) |
171 | tcf_block_offload_dec(block, &oldprog->gen_flags); | |
172 | ||
3f7889c4 | 173 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); |
102740bd | 174 | if (prog) { |
3f7889c4 | 175 | if (err < 0) { |
102740bd | 176 | cls_bpf_offload_cmd(tp, oldprog, prog); |
3f7889c4 JP |
177 | return err; |
178 | } else if (err > 0) { | |
caa72601 | 179 | tcf_block_offload_inc(block, &prog->gen_flags); |
3f7889c4 JP |
180 | } |
181 | } | |
182 | ||
102740bd | 183 | if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) |
3f7889c4 | 184 | return -EINVAL; |
5cecb6cc | 185 | |
3f7889c4 | 186 | return 0; |
332ae8e2 JK |
187 | } |
188 | ||
ad9294db DB |
189 | static u32 cls_bpf_flags(u32 flags) |
190 | { | |
191 | return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; | |
192 | } | |
193 | ||
eadb4148 JK |
194 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
195 | struct cls_bpf_prog *oldprog) | |
332ae8e2 | 196 | { |
ad9294db DB |
197 | if (prog && oldprog && |
198 | cls_bpf_flags(prog->gen_flags) != | |
199 | cls_bpf_flags(oldprog->gen_flags)) | |
102740bd | 200 | return -EINVAL; |
332ae8e2 | 201 | |
102740bd JK |
202 | if (prog && tc_skip_hw(prog->gen_flags)) |
203 | prog = NULL; | |
204 | if (oldprog && tc_skip_hw(oldprog->gen_flags)) | |
205 | oldprog = NULL; | |
206 | if (!prog && !oldprog) | |
207 | return 0; | |
eadb4148 | 208 | |
102740bd | 209 | return cls_bpf_offload_cmd(tp, prog, oldprog); |
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 | ||
102740bd JK |
217 | err = cls_bpf_offload_cmd(tp, NULL, prog); |
218 | if (err) | |
332ae8e2 | 219 | pr_err("Stopping hardware offload failed: %d\n", err); |
332ae8e2 JK |
220 | } |
221 | ||
68d64063 JK |
222 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
223 | struct cls_bpf_prog *prog) | |
224 | { | |
102740bd JK |
225 | struct tcf_block *block = tp->chain->block; |
226 | struct tc_cls_bpf_offload cls_bpf = {}; | |
227 | ||
228 | tc_cls_common_offload_init(&cls_bpf.common, tp); | |
229 | cls_bpf.command = TC_CLSBPF_STATS; | |
230 | cls_bpf.exts = &prog->exts; | |
231 | cls_bpf.prog = prog->filter; | |
232 | cls_bpf.name = prog->bpf_name; | |
233 | cls_bpf.exts_integrated = prog->exts_integrated; | |
234 | cls_bpf.gen_flags = prog->gen_flags; | |
68d64063 | 235 | |
102740bd | 236 | tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, false); |
68d64063 JK |
237 | } |
238 | ||
7d1d65cb DB |
239 | static int cls_bpf_init(struct tcf_proto *tp) |
240 | { | |
241 | struct cls_bpf_head *head; | |
242 | ||
243 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
244 | if (head == NULL) | |
245 | return -ENOBUFS; | |
246 | ||
1f947bf1 | 247 | INIT_LIST_HEAD_RCU(&head->plist); |
76cf546c | 248 | idr_init(&head->handle_idr); |
1f947bf1 | 249 | rcu_assign_pointer(tp->root, head); |
7d1d65cb DB |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
25415cec | 254 | static void cls_bpf_free_parms(struct cls_bpf_prog *prog) |
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 | 262 | kfree(prog->bpf_ops); |
25415cec JK |
263 | } |
264 | ||
265 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) | |
266 | { | |
267 | tcf_exts_destroy(&prog->exts); | |
268 | tcf_exts_put_net(&prog->exts); | |
269 | ||
270 | cls_bpf_free_parms(prog); | |
7d1d65cb DB |
271 | kfree(prog); |
272 | } | |
273 | ||
e910af67 CW |
274 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
275 | { | |
276 | struct cls_bpf_prog *prog = container_of(work, struct cls_bpf_prog, work); | |
277 | ||
278 | rtnl_lock(); | |
279 | __cls_bpf_delete_prog(prog); | |
280 | rtnl_unlock(); | |
281 | } | |
282 | ||
8d829bdb | 283 | static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu) |
1f947bf1 | 284 | { |
e910af67 CW |
285 | struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu); |
286 | ||
287 | INIT_WORK(&prog->work, cls_bpf_delete_prog_work); | |
288 | tcf_queue_work(&prog->work); | |
1f947bf1 JF |
289 | } |
290 | ||
8d829bdb | 291 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog) |
7d1d65cb | 292 | { |
76cf546c CW |
293 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
294 | ||
295 | idr_remove_ext(&head->handle_idr, prog->handle); | |
332ae8e2 | 296 | cls_bpf_stop_offload(tp, prog); |
472f5837 JP |
297 | list_del_rcu(&prog->link); |
298 | tcf_unbind_filter(tp, &prog->res); | |
aae2c35e CW |
299 | if (tcf_exts_get_net(&prog->exts)) |
300 | call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu); | |
301 | else | |
302 | __cls_bpf_delete_prog(prog); | |
8d829bdb | 303 | } |
e2e9b654 | 304 | |
571acf21 AA |
305 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, |
306 | struct netlink_ext_ack *extack) | |
8d829bdb | 307 | { |
763dbf63 WC |
308 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
309 | ||
8113c095 | 310 | __cls_bpf_delete(tp, arg); |
763dbf63 | 311 | *last = list_empty(&head->plist); |
472f5837 | 312 | return 0; |
7d1d65cb DB |
313 | } |
314 | ||
763dbf63 | 315 | static void cls_bpf_destroy(struct tcf_proto *tp) |
7d1d65cb | 316 | { |
1f947bf1 | 317 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
318 | struct cls_bpf_prog *prog, *tmp; |
319 | ||
8d829bdb DB |
320 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
321 | __cls_bpf_delete(tp, prog); | |
7d1d65cb | 322 | |
76cf546c | 323 | idr_destroy(&head->handle_idr); |
1f947bf1 | 324 | kfree_rcu(head, rcu); |
7d1d65cb DB |
325 | } |
326 | ||
8113c095 | 327 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
7d1d65cb | 328 | { |
1f947bf1 | 329 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb | 330 | struct cls_bpf_prog *prog; |
7d1d65cb | 331 | |
3fe6b49e | 332 | list_for_each_entry(prog, &head->plist, link) { |
8113c095 WC |
333 | if (prog->handle == handle) |
334 | return prog; | |
7d1d65cb DB |
335 | } |
336 | ||
8113c095 | 337 | return NULL; |
7d1d65cb DB |
338 | } |
339 | ||
045efa82 | 340 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 341 | { |
1f947bf1 | 342 | struct sock_filter *bpf_ops; |
e2e9b654 | 343 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 344 | struct bpf_prog *fp; |
33e9fcc6 | 345 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
346 | int ret; |
347 | ||
33e9fcc6 | 348 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
349 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
350 | return -EINVAL; | |
7d1d65cb | 351 | |
33e9fcc6 | 352 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
353 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
354 | return -EINVAL; | |
7913ecf6 | 355 | |
7d1d65cb | 356 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
e2e9b654 DB |
357 | if (bpf_ops == NULL) |
358 | return -ENOMEM; | |
7d1d65cb DB |
359 | |
360 | memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size); | |
361 | ||
e2e9b654 DB |
362 | fprog_tmp.len = bpf_num_ops; |
363 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 364 | |
e2e9b654 DB |
365 | ret = bpf_prog_create(&fp, &fprog_tmp); |
366 | if (ret < 0) { | |
367 | kfree(bpf_ops); | |
368 | return ret; | |
369 | } | |
7d1d65cb | 370 | |
7d1d65cb | 371 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
372 | prog->bpf_num_ops = bpf_num_ops; |
373 | prog->bpf_name = NULL; | |
7d1d65cb | 374 | prog->filter = fp; |
7d1d65cb | 375 | |
e2e9b654 DB |
376 | return 0; |
377 | } | |
378 | ||
c46646d0 | 379 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
6c8dfe21 | 380 | u32 gen_flags, const struct tcf_proto *tp) |
e2e9b654 DB |
381 | { |
382 | struct bpf_prog *fp; | |
383 | char *name = NULL; | |
288b3de5 | 384 | bool skip_sw; |
e2e9b654 DB |
385 | u32 bpf_fd; |
386 | ||
387 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
288b3de5 | 388 | skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; |
e2e9b654 | 389 | |
288b3de5 | 390 | fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); |
e2e9b654 DB |
391 | if (IS_ERR(fp)) |
392 | return PTR_ERR(fp); | |
393 | ||
e2e9b654 | 394 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 395 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
396 | if (!name) { |
397 | bpf_prog_put(fp); | |
398 | return -ENOMEM; | |
399 | } | |
400 | } | |
401 | ||
402 | prog->bpf_ops = NULL; | |
e2e9b654 | 403 | prog->bpf_name = name; |
e2e9b654 | 404 | prog->filter = fp; |
e2e9b654 | 405 | |
f36fe1c4 JP |
406 | if (fp->dst_needed) |
407 | tcf_block_netif_keep_dst(tp->chain->block); | |
c46646d0 | 408 | |
e2e9b654 DB |
409 | return 0; |
410 | } | |
411 | ||
6a725c48 JP |
412 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
413 | struct cls_bpf_prog *prog, unsigned long base, | |
50a56190 AA |
414 | struct nlattr **tb, struct nlattr *est, bool ovr, |
415 | struct netlink_ext_ack *extack) | |
e2e9b654 | 416 | { |
045efa82 | 417 | bool is_bpf, is_ebpf, have_exts = false; |
0d01d45f | 418 | u32 gen_flags = 0; |
e2e9b654 DB |
419 | int ret; |
420 | ||
421 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
422 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 423 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
424 | return -EINVAL; |
425 | ||
50a56190 | 426 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, extack); |
e2e9b654 DB |
427 | if (ret < 0) |
428 | return ret; | |
429 | ||
045efa82 DB |
430 | if (tb[TCA_BPF_FLAGS]) { |
431 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
432 | ||
6839da32 JP |
433 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
434 | return -EINVAL; | |
045efa82 DB |
435 | |
436 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
437 | } | |
0d01d45f JK |
438 | if (tb[TCA_BPF_FLAGS_GEN]) { |
439 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
440 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
6839da32 JP |
441 | !tc_flags_valid(gen_flags)) |
442 | return -EINVAL; | |
0d01d45f | 443 | } |
045efa82 | 444 | |
045efa82 | 445 | prog->exts_integrated = have_exts; |
0d01d45f | 446 | prog->gen_flags = gen_flags; |
e2e9b654 | 447 | |
045efa82 | 448 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
6c8dfe21 | 449 | cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); |
b9a24bb7 | 450 | if (ret < 0) |
6839da32 | 451 | return ret; |
e2e9b654 | 452 | |
ef146fa4 DB |
453 | if (tb[TCA_BPF_CLASSID]) { |
454 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
455 | tcf_bind_filter(tp, &prog->res, base); | |
456 | } | |
7d1d65cb | 457 | |
7d1d65cb | 458 | return 0; |
7d1d65cb DB |
459 | } |
460 | ||
7d1d65cb DB |
461 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, |
462 | struct tcf_proto *tp, unsigned long base, | |
463 | u32 handle, struct nlattr **tca, | |
7306db38 | 464 | void **arg, bool ovr, struct netlink_ext_ack *extack) |
7d1d65cb | 465 | { |
1f947bf1 | 466 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
8113c095 | 467 | struct cls_bpf_prog *oldprog = *arg; |
7d1d65cb | 468 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 469 | struct cls_bpf_prog *prog; |
76cf546c | 470 | unsigned long idr_index; |
7d1d65cb DB |
471 | int ret; |
472 | ||
473 | if (tca[TCA_OPTIONS] == NULL) | |
474 | return -EINVAL; | |
475 | ||
fceb6435 JB |
476 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
477 | NULL); | |
7d1d65cb DB |
478 | if (ret < 0) |
479 | return ret; | |
480 | ||
7d1d65cb | 481 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 482 | if (!prog) |
7d1d65cb DB |
483 | return -ENOBUFS; |
484 | ||
b9a24bb7 WC |
485 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
486 | if (ret < 0) | |
487 | goto errout; | |
1f947bf1 JF |
488 | |
489 | if (oldprog) { | |
490 | if (handle && oldprog->handle != handle) { | |
491 | ret = -EINVAL; | |
492 | goto errout; | |
493 | } | |
494 | } | |
495 | ||
76cf546c CW |
496 | if (handle == 0) { |
497 | ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index, | |
498 | 1, 0x7FFFFFFF, GFP_KERNEL); | |
499 | if (ret) | |
500 | goto errout; | |
501 | prog->handle = idr_index; | |
502 | } else { | |
503 | if (!oldprog) { | |
504 | ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index, | |
505 | handle, handle + 1, GFP_KERNEL); | |
506 | if (ret) | |
507 | goto errout; | |
508 | } | |
7d1d65cb | 509 | prog->handle = handle; |
7d1d65cb DB |
510 | } |
511 | ||
50a56190 AA |
512 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, |
513 | extack); | |
7d1d65cb | 514 | if (ret < 0) |
76cf546c | 515 | goto errout_idr; |
7d1d65cb | 516 | |
eadb4148 | 517 | ret = cls_bpf_offload(tp, prog, oldprog); |
25415cec JK |
518 | if (ret) |
519 | goto errout_parms; | |
332ae8e2 | 520 | |
5cecb6cc OG |
521 | if (!tc_in_hw(prog->gen_flags)) |
522 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
523 | ||
1f947bf1 | 524 | if (oldprog) { |
76cf546c | 525 | idr_replace_ext(&head->handle_idr, prog, handle); |
f6bfc46d | 526 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 527 | tcf_unbind_filter(tp, &oldprog->res); |
aae2c35e | 528 | tcf_exts_get_net(&oldprog->exts); |
8d829bdb | 529 | call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu); |
1f947bf1 JF |
530 | } else { |
531 | list_add_rcu(&prog->link, &head->plist); | |
532 | } | |
7d1d65cb | 533 | |
8113c095 | 534 | *arg = prog; |
7d1d65cb | 535 | return 0; |
b9a24bb7 | 536 | |
25415cec JK |
537 | errout_parms: |
538 | cls_bpf_free_parms(prog); | |
76cf546c CW |
539 | errout_idr: |
540 | if (!oldprog) | |
541 | idr_remove_ext(&head->handle_idr, prog->handle); | |
7d1d65cb | 542 | errout: |
b9a24bb7 | 543 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 544 | kfree(prog); |
7d1d65cb DB |
545 | return ret; |
546 | } | |
547 | ||
e2e9b654 DB |
548 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
549 | struct sk_buff *skb) | |
550 | { | |
551 | struct nlattr *nla; | |
552 | ||
553 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
554 | return -EMSGSIZE; | |
555 | ||
556 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
557 | sizeof(struct sock_filter)); | |
558 | if (nla == NULL) | |
559 | return -EMSGSIZE; | |
560 | ||
561 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
567 | struct sk_buff *skb) | |
568 | { | |
7bd509e3 DB |
569 | struct nlattr *nla; |
570 | ||
e2e9b654 DB |
571 | if (prog->bpf_name && |
572 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
573 | return -EMSGSIZE; | |
574 | ||
e8628307 DB |
575 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
576 | return -EMSGSIZE; | |
577 | ||
f1f7714e | 578 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
579 | if (nla == NULL) |
580 | return -EMSGSIZE; | |
581 | ||
f1f7714e | 582 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 583 | |
e2e9b654 DB |
584 | return 0; |
585 | } | |
586 | ||
8113c095 | 587 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
7d1d65cb DB |
588 | struct sk_buff *skb, struct tcmsg *tm) |
589 | { | |
8113c095 | 590 | struct cls_bpf_prog *prog = fh; |
e2e9b654 | 591 | struct nlattr *nest; |
bf007d1c | 592 | u32 bpf_flags = 0; |
e2e9b654 | 593 | int ret; |
7d1d65cb DB |
594 | |
595 | if (prog == NULL) | |
596 | return skb->len; | |
597 | ||
598 | tm->tcm_handle = prog->handle; | |
599 | ||
68d64063 JK |
600 | cls_bpf_offload_update_stats(tp, prog); |
601 | ||
7d1d65cb DB |
602 | nest = nla_nest_start(skb, TCA_OPTIONS); |
603 | if (nest == NULL) | |
604 | goto nla_put_failure; | |
605 | ||
ef146fa4 DB |
606 | if (prog->res.classid && |
607 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 608 | goto nla_put_failure; |
7d1d65cb | 609 | |
e2e9b654 DB |
610 | if (cls_bpf_is_ebpf(prog)) |
611 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
612 | else | |
613 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
614 | if (ret) | |
7d1d65cb DB |
615 | goto nla_put_failure; |
616 | ||
5da57f42 | 617 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
618 | goto nla_put_failure; |
619 | ||
bf007d1c DB |
620 | if (prog->exts_integrated) |
621 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
622 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
623 | goto nla_put_failure; | |
0d01d45f JK |
624 | if (prog->gen_flags && |
625 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
626 | goto nla_put_failure; | |
bf007d1c | 627 | |
7d1d65cb DB |
628 | nla_nest_end(skb, nest); |
629 | ||
5da57f42 | 630 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
631 | goto nla_put_failure; |
632 | ||
633 | return skb->len; | |
634 | ||
635 | nla_put_failure: | |
636 | nla_nest_cancel(skb, nest); | |
637 | return -1; | |
638 | } | |
639 | ||
07d79fc7 CW |
640 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) |
641 | { | |
642 | struct cls_bpf_prog *prog = fh; | |
643 | ||
644 | if (prog && prog->res.classid == classid) | |
645 | prog->res.class = cl; | |
646 | } | |
647 | ||
7d1d65cb DB |
648 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
649 | { | |
1f947bf1 | 650 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
651 | struct cls_bpf_prog *prog; |
652 | ||
3fe6b49e | 653 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
654 | if (arg->count < arg->skip) |
655 | goto skip; | |
8113c095 | 656 | if (arg->fn(tp, prog, arg) < 0) { |
7d1d65cb DB |
657 | arg->stop = 1; |
658 | break; | |
659 | } | |
660 | skip: | |
661 | arg->count++; | |
662 | } | |
663 | } | |
664 | ||
665 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { | |
666 | .kind = "bpf", | |
667 | .owner = THIS_MODULE, | |
668 | .classify = cls_bpf_classify, | |
669 | .init = cls_bpf_init, | |
670 | .destroy = cls_bpf_destroy, | |
671 | .get = cls_bpf_get, | |
7d1d65cb DB |
672 | .change = cls_bpf_change, |
673 | .delete = cls_bpf_delete, | |
674 | .walk = cls_bpf_walk, | |
675 | .dump = cls_bpf_dump, | |
07d79fc7 | 676 | .bind_class = cls_bpf_bind_class, |
7d1d65cb DB |
677 | }; |
678 | ||
679 | static int __init cls_bpf_init_mod(void) | |
680 | { | |
681 | return register_tcf_proto_ops(&cls_bpf_ops); | |
682 | } | |
683 | ||
684 | static void __exit cls_bpf_exit_mod(void) | |
685 | { | |
686 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
687 | } | |
688 | ||
689 | module_init(cls_bpf_init_mod); | |
690 | module_exit(cls_bpf_exit_mod); |