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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7d1d65cb DB |
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> | |
7d1d65cb DB |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/filter.h> | |
e2e9b654 | 16 | #include <linux/bpf.h> |
76cf546c | 17 | #include <linux/idr.h> |
e2e9b654 | 18 | |
7d1d65cb DB |
19 | #include <net/rtnetlink.h> |
20 | #include <net/pkt_cls.h> | |
21 | #include <net/sock.h> | |
9f3101dc | 22 | #include <net/tc_wrapper.h> |
7d1d65cb DB |
23 | |
24 | MODULE_LICENSE("GPL"); | |
25 | MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); | |
26 | MODULE_DESCRIPTION("TC BPF based classifier"); | |
27 | ||
e2e9b654 | 28 | #define CLS_BPF_NAME_LEN 256 |
0d01d45f | 29 | #define CLS_BPF_SUPPORTED_GEN_FLAGS \ |
eadb4148 | 30 | (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) |
e2e9b654 | 31 | |
7d1d65cb DB |
32 | struct cls_bpf_head { |
33 | struct list_head plist; | |
76cf546c | 34 | struct idr handle_idr; |
1f947bf1 | 35 | struct rcu_head rcu; |
7d1d65cb DB |
36 | }; |
37 | ||
38 | struct cls_bpf_prog { | |
7ae457c1 | 39 | struct bpf_prog *filter; |
7d1d65cb | 40 | struct list_head link; |
e2e9b654 | 41 | struct tcf_result res; |
045efa82 | 42 | bool exts_integrated; |
0d01d45f | 43 | u32 gen_flags; |
7e916b76 | 44 | unsigned int in_hw_count; |
e2e9b654 | 45 | struct tcf_exts exts; |
7d1d65cb | 46 | u32 handle; |
55556dd5 | 47 | u16 bpf_num_ops; |
e2e9b654 DB |
48 | struct sock_filter *bpf_ops; |
49 | const char *bpf_name; | |
1f947bf1 | 50 | struct tcf_proto *tp; |
aaa908ff | 51 | struct rcu_work rwork; |
7d1d65cb DB |
52 | }; |
53 | ||
54 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
55 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 56 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 57 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 58 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
59 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
60 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
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 | ||
045efa82 DB |
66 | static int cls_bpf_exec_opcode(int code) |
67 | { | |
68 | switch (code) { | |
69 | case TC_ACT_OK: | |
045efa82 | 70 | case TC_ACT_SHOT: |
045efa82 | 71 | case TC_ACT_STOLEN: |
e25ea21f | 72 | case TC_ACT_TRAP: |
27b29f63 | 73 | case TC_ACT_REDIRECT: |
045efa82 DB |
74 | case TC_ACT_UNSPEC: |
75 | return code; | |
76 | default: | |
77 | return TC_ACT_UNSPEC; | |
78 | } | |
79 | } | |
80 | ||
9f3101dc PT |
81 | TC_INDIRECT_SCOPE int cls_bpf_classify(struct sk_buff *skb, |
82 | const struct tcf_proto *tp, | |
83 | struct tcf_result *res) | |
7d1d65cb | 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 | |
1f947bf1 | 90 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
91 | int filter_res; |
92 | ||
045efa82 DB |
93 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
94 | ||
eadb4148 JK |
95 | if (tc_skip_sw(prog->gen_flags)) { |
96 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
97 | } else if (at_ingress) { | |
3431205e AS |
98 | /* It is safe to push/pull even if skb_shared() */ |
99 | __skb_push(skb, skb->mac_len); | |
6aaae2b6 | 100 | bpf_compute_data_pointers(skb); |
fb7dd8bc | 101 | filter_res = bpf_prog_run(prog->filter, skb); |
3431205e AS |
102 | __skb_pull(skb, skb->mac_len); |
103 | } else { | |
6aaae2b6 | 104 | bpf_compute_data_pointers(skb); |
fb7dd8bc | 105 | filter_res = bpf_prog_run(prog->filter, skb); |
3431205e | 106 | } |
4d25ca2d AC |
107 | if (unlikely(!skb->tstamp && skb->tstamp_type)) |
108 | skb->tstamp_type = SKB_CLOCK_REALTIME; | |
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 DB |
135 | } |
136 | ||
54720df1 | 137 | return ret; |
7d1d65cb DB |
138 | } |
139 | ||
e2e9b654 DB |
140 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
141 | { | |
142 | return !prog->bpf_ops; | |
143 | } | |
144 | ||
332ae8e2 | 145 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
631f65ff QM |
146 | struct cls_bpf_prog *oldprog, |
147 | struct netlink_ext_ack *extack) | |
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 | ||
d6787147 | 158 | tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack); |
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; | |
332ae8e2 | 165 | |
41aa29a5 | 166 | if (oldprog && prog) |
40119211 VB |
167 | err = tc_setup_cb_replace(block, tp, TC_SETUP_CLSBPF, &cls_bpf, |
168 | skip_sw, &oldprog->gen_flags, | |
169 | &oldprog->in_hw_count, | |
170 | &prog->gen_flags, &prog->in_hw_count, | |
171 | true); | |
41aa29a5 | 172 | else if (prog) |
40119211 VB |
173 | err = tc_setup_cb_add(block, tp, TC_SETUP_CLSBPF, &cls_bpf, |
174 | skip_sw, &prog->gen_flags, | |
175 | &prog->in_hw_count, true); | |
41aa29a5 JK |
176 | else |
177 | err = tc_setup_cb_destroy(block, tp, TC_SETUP_CLSBPF, &cls_bpf, | |
178 | skip_sw, &oldprog->gen_flags, | |
179 | &oldprog->in_hw_count, true); | |
caa72601 | 180 | |
40119211 VB |
181 | if (prog && err) { |
182 | cls_bpf_offload_cmd(tp, oldprog, prog, extack); | |
183 | return err; | |
3f7889c4 JP |
184 | } |
185 | ||
102740bd | 186 | if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) |
3f7889c4 | 187 | return -EINVAL; |
5cecb6cc | 188 | |
3f7889c4 | 189 | return 0; |
332ae8e2 JK |
190 | } |
191 | ||
ad9294db DB |
192 | static u32 cls_bpf_flags(u32 flags) |
193 | { | |
194 | return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; | |
195 | } | |
196 | ||
eadb4148 | 197 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
631f65ff QM |
198 | struct cls_bpf_prog *oldprog, |
199 | struct netlink_ext_ack *extack) | |
332ae8e2 | 200 | { |
ad9294db DB |
201 | if (prog && oldprog && |
202 | cls_bpf_flags(prog->gen_flags) != | |
203 | cls_bpf_flags(oldprog->gen_flags)) | |
102740bd | 204 | return -EINVAL; |
332ae8e2 | 205 | |
102740bd JK |
206 | if (prog && tc_skip_hw(prog->gen_flags)) |
207 | prog = NULL; | |
208 | if (oldprog && tc_skip_hw(oldprog->gen_flags)) | |
209 | oldprog = NULL; | |
210 | if (!prog && !oldprog) | |
211 | return 0; | |
eadb4148 | 212 | |
631f65ff | 213 | return cls_bpf_offload_cmd(tp, prog, oldprog, extack); |
332ae8e2 JK |
214 | } |
215 | ||
216 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
0e908a45 JK |
217 | struct cls_bpf_prog *prog, |
218 | struct netlink_ext_ack *extack) | |
332ae8e2 JK |
219 | { |
220 | int err; | |
221 | ||
0e908a45 | 222 | err = cls_bpf_offload_cmd(tp, NULL, prog, extack); |
102740bd | 223 | if (err) |
332ae8e2 | 224 | pr_err("Stopping hardware offload failed: %d\n", err); |
332ae8e2 JK |
225 | } |
226 | ||
68d64063 JK |
227 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
228 | struct cls_bpf_prog *prog) | |
229 | { | |
102740bd JK |
230 | struct tcf_block *block = tp->chain->block; |
231 | struct tc_cls_bpf_offload cls_bpf = {}; | |
232 | ||
d6787147 | 233 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); |
102740bd JK |
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; | |
68d64063 | 239 | |
40119211 | 240 | tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false, true); |
68d64063 JK |
241 | } |
242 | ||
7d1d65cb DB |
243 | static int cls_bpf_init(struct tcf_proto *tp) |
244 | { | |
245 | struct cls_bpf_head *head; | |
246 | ||
247 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
248 | if (head == NULL) | |
249 | return -ENOBUFS; | |
250 | ||
1f947bf1 | 251 | INIT_LIST_HEAD_RCU(&head->plist); |
76cf546c | 252 | idr_init(&head->handle_idr); |
1f947bf1 | 253 | rcu_assign_pointer(tp->root, head); |
7d1d65cb DB |
254 | |
255 | return 0; | |
256 | } | |
257 | ||
25415cec | 258 | static void cls_bpf_free_parms(struct cls_bpf_prog *prog) |
7d1d65cb | 259 | { |
e2e9b654 DB |
260 | if (cls_bpf_is_ebpf(prog)) |
261 | bpf_prog_put(prog->filter); | |
262 | else | |
263 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 264 | |
e2e9b654 | 265 | kfree(prog->bpf_name); |
7d1d65cb | 266 | kfree(prog->bpf_ops); |
25415cec JK |
267 | } |
268 | ||
269 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) | |
270 | { | |
271 | tcf_exts_destroy(&prog->exts); | |
272 | tcf_exts_put_net(&prog->exts); | |
273 | ||
274 | cls_bpf_free_parms(prog); | |
7d1d65cb DB |
275 | kfree(prog); |
276 | } | |
277 | ||
e910af67 CW |
278 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
279 | { | |
aaa908ff CW |
280 | struct cls_bpf_prog *prog = container_of(to_rcu_work(work), |
281 | struct cls_bpf_prog, | |
282 | rwork); | |
e910af67 CW |
283 | rtnl_lock(); |
284 | __cls_bpf_delete_prog(prog); | |
285 | rtnl_unlock(); | |
286 | } | |
287 | ||
0e908a45 JK |
288 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
289 | struct netlink_ext_ack *extack) | |
7d1d65cb | 290 | { |
76cf546c CW |
291 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
292 | ||
9c160941 | 293 | idr_remove(&head->handle_idr, prog->handle); |
0e908a45 | 294 | cls_bpf_stop_offload(tp, prog, extack); |
472f5837 JP |
295 | list_del_rcu(&prog->link); |
296 | tcf_unbind_filter(tp, &prog->res); | |
aae2c35e | 297 | if (tcf_exts_get_net(&prog->exts)) |
aaa908ff | 298 | tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); |
aae2c35e CW |
299 | else |
300 | __cls_bpf_delete_prog(prog); | |
8d829bdb | 301 | } |
e2e9b654 | 302 | |
571acf21 | 303 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 304 | bool rtnl_held, struct netlink_ext_ack *extack) |
8d829bdb | 305 | { |
763dbf63 WC |
306 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
307 | ||
0e908a45 | 308 | __cls_bpf_delete(tp, arg, extack); |
763dbf63 | 309 | *last = list_empty(&head->plist); |
472f5837 | 310 | return 0; |
7d1d65cb DB |
311 | } |
312 | ||
12db03b6 | 313 | static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 314 | struct netlink_ext_ack *extack) |
7d1d65cb | 315 | { |
1f947bf1 | 316 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
317 | struct cls_bpf_prog *prog, *tmp; |
318 | ||
8d829bdb | 319 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
0e908a45 | 320 | __cls_bpf_delete(tp, prog, extack); |
7d1d65cb | 321 | |
76cf546c | 322 | idr_destroy(&head->handle_idr); |
1f947bf1 | 323 | kfree_rcu(head, rcu); |
7d1d65cb DB |
324 | } |
325 | ||
8113c095 | 326 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
7d1d65cb | 327 | { |
1f947bf1 | 328 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb | 329 | struct cls_bpf_prog *prog; |
7d1d65cb | 330 | |
3fe6b49e | 331 | list_for_each_entry(prog, &head->plist, link) { |
8113c095 WC |
332 | if (prog->handle == handle) |
333 | return prog; | |
7d1d65cb DB |
334 | } |
335 | ||
8113c095 | 336 | return NULL; |
7d1d65cb DB |
337 | } |
338 | ||
045efa82 | 339 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 340 | { |
1f947bf1 | 341 | struct sock_filter *bpf_ops; |
e2e9b654 | 342 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 343 | struct bpf_prog *fp; |
33e9fcc6 | 344 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
345 | int ret; |
346 | ||
33e9fcc6 | 347 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
348 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
349 | return -EINVAL; | |
7d1d65cb | 350 | |
33e9fcc6 | 351 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
352 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
353 | return -EINVAL; | |
7913ecf6 | 354 | |
f9562fa4 | 355 | bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); |
e2e9b654 DB |
356 | if (bpf_ops == NULL) |
357 | return -ENOMEM; | |
7d1d65cb | 358 | |
e2e9b654 DB |
359 | fprog_tmp.len = bpf_num_ops; |
360 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 361 | |
e2e9b654 DB |
362 | ret = bpf_prog_create(&fp, &fprog_tmp); |
363 | if (ret < 0) { | |
364 | kfree(bpf_ops); | |
365 | return ret; | |
366 | } | |
7d1d65cb | 367 | |
7d1d65cb | 368 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
369 | prog->bpf_num_ops = bpf_num_ops; |
370 | prog->bpf_name = NULL; | |
7d1d65cb | 371 | prog->filter = fp; |
7d1d65cb | 372 | |
e2e9b654 DB |
373 | return 0; |
374 | } | |
375 | ||
c46646d0 | 376 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
6c8dfe21 | 377 | u32 gen_flags, const struct tcf_proto *tp) |
e2e9b654 DB |
378 | { |
379 | struct bpf_prog *fp; | |
380 | char *name = NULL; | |
288b3de5 | 381 | bool skip_sw; |
e2e9b654 DB |
382 | u32 bpf_fd; |
383 | ||
384 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
288b3de5 | 385 | skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; |
e2e9b654 | 386 | |
288b3de5 | 387 | fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); |
e2e9b654 DB |
388 | if (IS_ERR(fp)) |
389 | return PTR_ERR(fp); | |
390 | ||
e2e9b654 | 391 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 392 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
393 | if (!name) { |
394 | bpf_prog_put(fp); | |
395 | return -ENOMEM; | |
396 | } | |
397 | } | |
398 | ||
399 | prog->bpf_ops = NULL; | |
e2e9b654 | 400 | prog->bpf_name = name; |
e2e9b654 | 401 | prog->filter = fp; |
e2e9b654 | 402 | |
f36fe1c4 JP |
403 | if (fp->dst_needed) |
404 | tcf_block_netif_keep_dst(tp->chain->block); | |
c46646d0 | 405 | |
e2e9b654 DB |
406 | return 0; |
407 | } | |
408 | ||
7d1d65cb DB |
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, | |
695176bf | 412 | void **arg, u32 flags, |
12db03b6 | 413 | struct netlink_ext_ack *extack) |
7d1d65cb | 414 | { |
1f947bf1 | 415 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
26a22194 | 416 | bool is_bpf, is_ebpf, have_exts = false; |
8113c095 | 417 | struct cls_bpf_prog *oldprog = *arg; |
7d1d65cb | 418 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
26a22194 | 419 | bool bound_to_filter = false; |
1f947bf1 | 420 | struct cls_bpf_prog *prog; |
26a22194 | 421 | u32 gen_flags = 0; |
7d1d65cb DB |
422 | int ret; |
423 | ||
424 | if (tca[TCA_OPTIONS] == NULL) | |
425 | return -EINVAL; | |
426 | ||
8cb08174 JB |
427 | ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], |
428 | bpf_policy, NULL); | |
7d1d65cb DB |
429 | if (ret < 0) |
430 | return ret; | |
431 | ||
7d1d65cb | 432 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 433 | if (!prog) |
7d1d65cb DB |
434 | return -ENOBUFS; |
435 | ||
14215108 | 436 | ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); |
b9a24bb7 WC |
437 | if (ret < 0) |
438 | goto errout; | |
1f947bf1 JF |
439 | |
440 | if (oldprog) { | |
441 | if (handle && oldprog->handle != handle) { | |
442 | ret = -EINVAL; | |
443 | goto errout; | |
444 | } | |
445 | } | |
446 | ||
76cf546c | 447 | if (handle == 0) { |
0b4ce8da MW |
448 | handle = 1; |
449 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, | |
450 | INT_MAX, GFP_KERNEL); | |
451 | } else if (!oldprog) { | |
452 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, | |
453 | handle, GFP_KERNEL); | |
7d1d65cb DB |
454 | } |
455 | ||
0b4ce8da MW |
456 | if (ret) |
457 | goto errout; | |
458 | prog->handle = handle; | |
459 | ||
26a22194 VN |
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, tca[TCA_RATE], &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(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(tb[TCA_BPF_FLAGS_GEN]); | |
484 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
485 | !tc_flags_valid(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); | |
7d1d65cb | 496 | if (ret < 0) |
76cf546c | 497 | goto errout_idr; |
7d1d65cb | 498 | |
26a22194 VN |
499 | if (tb[TCA_BPF_CLASSID]) { |
500 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
501 | tcf_bind_filter(tp, &prog->res, base); | |
502 | bound_to_filter = true; | |
503 | } | |
504 | ||
631f65ff | 505 | ret = cls_bpf_offload(tp, prog, oldprog, extack); |
25415cec JK |
506 | if (ret) |
507 | goto errout_parms; | |
332ae8e2 | 508 | |
5cecb6cc OG |
509 | if (!tc_in_hw(prog->gen_flags)) |
510 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
511 | ||
1f947bf1 | 512 | if (oldprog) { |
234a4624 | 513 | idr_replace(&head->handle_idr, prog, handle); |
f6bfc46d | 514 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 515 | tcf_unbind_filter(tp, &oldprog->res); |
aae2c35e | 516 | tcf_exts_get_net(&oldprog->exts); |
aaa908ff | 517 | tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); |
1f947bf1 JF |
518 | } else { |
519 | list_add_rcu(&prog->link, &head->plist); | |
520 | } | |
7d1d65cb | 521 | |
8113c095 | 522 | *arg = prog; |
7d1d65cb | 523 | return 0; |
b9a24bb7 | 524 | |
25415cec | 525 | errout_parms: |
26a22194 VN |
526 | if (bound_to_filter) |
527 | tcf_unbind_filter(tp, &prog->res); | |
25415cec | 528 | cls_bpf_free_parms(prog); |
76cf546c CW |
529 | errout_idr: |
530 | if (!oldprog) | |
9c160941 | 531 | idr_remove(&head->handle_idr, prog->handle); |
7d1d65cb | 532 | errout: |
b9a24bb7 | 533 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 534 | kfree(prog); |
7d1d65cb DB |
535 | return ret; |
536 | } | |
537 | ||
e2e9b654 DB |
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, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
544 | return -EMSGSIZE; | |
545 | ||
546 | nla = nla_reserve(skb, TCA_BPF_OPS, 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 | { | |
7bd509e3 DB |
559 | struct nlattr *nla; |
560 | ||
e2e9b654 DB |
561 | if (prog->bpf_name && |
562 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
563 | return -EMSGSIZE; | |
564 | ||
e8628307 DB |
565 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
566 | return -EMSGSIZE; | |
567 | ||
f1f7714e | 568 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
569 | if (nla == NULL) |
570 | return -EMSGSIZE; | |
571 | ||
f1f7714e | 572 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 573 | |
e2e9b654 DB |
574 | return 0; |
575 | } | |
576 | ||
8113c095 | 577 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 578 | struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) |
7d1d65cb | 579 | { |
8113c095 | 580 | struct cls_bpf_prog *prog = fh; |
e2e9b654 | 581 | struct nlattr *nest; |
bf007d1c | 582 | u32 bpf_flags = 0; |
e2e9b654 | 583 | int ret; |
7d1d65cb DB |
584 | |
585 | if (prog == NULL) | |
586 | return skb->len; | |
587 | ||
588 | tm->tcm_handle = prog->handle; | |
589 | ||
68d64063 JK |
590 | cls_bpf_offload_update_stats(tp, prog); |
591 | ||
ae0be8de | 592 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
7d1d65cb DB |
593 | if (nest == NULL) |
594 | goto nla_put_failure; | |
595 | ||
ef146fa4 DB |
596 | if (prog->res.classid && |
597 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 598 | goto nla_put_failure; |
7d1d65cb | 599 | |
e2e9b654 DB |
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) | |
7d1d65cb DB |
605 | goto nla_put_failure; |
606 | ||
5da57f42 | 607 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
608 | goto nla_put_failure; |
609 | ||
bf007d1c DB |
610 | if (prog->exts_integrated) |
611 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
612 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
613 | goto nla_put_failure; | |
0d01d45f JK |
614 | if (prog->gen_flags && |
615 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
616 | goto nla_put_failure; | |
bf007d1c | 617 | |
7d1d65cb DB |
618 | nla_nest_end(skb, nest); |
619 | ||
5da57f42 | 620 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
621 | goto nla_put_failure; |
622 | ||
623 | return skb->len; | |
624 | ||
625 | nla_put_failure: | |
626 | nla_nest_cancel(skb, nest); | |
627 | return -1; | |
628 | } | |
629 | ||
2e24cd75 CW |
630 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl, |
631 | void *q, unsigned long base) | |
07d79fc7 CW |
632 | { |
633 | struct cls_bpf_prog *prog = fh; | |
634 | ||
cc9039a1 | 635 | tc_cls_bind_class(classid, cl, q, &prog->res, base); |
07d79fc7 CW |
636 | } |
637 | ||
12db03b6 VB |
638 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
639 | bool rtnl_held) | |
7d1d65cb | 640 | { |
1f947bf1 | 641 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
642 | struct cls_bpf_prog *prog; |
643 | ||
3fe6b49e | 644 | list_for_each_entry(prog, &head->plist, link) { |
5508ff7c | 645 | if (!tc_cls_stats_dump(tp, arg, prog)) |
7d1d65cb | 646 | break; |
7d1d65cb DB |
647 | } |
648 | } | |
649 | ||
a7323311 | 650 | static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, |
7e916b76 JH |
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(prog->gen_flags)) | |
661 | continue; | |
662 | ||
663 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, | |
d6787147 | 664 | extack); |
7e916b76 JH |
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 | ||
40119211 VB |
672 | err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSBPF, |
673 | &cls_bpf, cb_priv, &prog->gen_flags, | |
674 | &prog->in_hw_count); | |
675 | if (err) | |
676 | return err; | |
7e916b76 JH |
677 | } |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
7d1d65cb DB |
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, | |
7d1d65cb DB |
689 | .change = cls_bpf_change, |
690 | .delete = cls_bpf_delete, | |
691 | .walk = cls_bpf_walk, | |
7e916b76 | 692 | .reoffload = cls_bpf_reoffload, |
7d1d65cb | 693 | .dump = cls_bpf_dump, |
07d79fc7 | 694 | .bind_class = cls_bpf_bind_class, |
7d1d65cb | 695 | }; |
241a94ab | 696 | MODULE_ALIAS_NET_CLS("bpf"); |
7d1d65cb DB |
697 | |
698 | static int __init cls_bpf_init_mod(void) | |
699 | { | |
700 | return register_tcf_proto_ops(&cls_bpf_ops); | |
701 | } | |
702 | ||
703 | static void __exit cls_bpf_exit_mod(void) | |
704 | { | |
705 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
706 | } | |
707 | ||
708 | module_init(cls_bpf_init_mod); | |
709 | module_exit(cls_bpf_exit_mod); |