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> | |
22 | ||
23 | MODULE_LICENSE("GPL"); | |
24 | MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); | |
25 | MODULE_DESCRIPTION("TC BPF based classifier"); | |
26 | ||
e2e9b654 | 27 | #define CLS_BPF_NAME_LEN 256 |
0d01d45f | 28 | #define CLS_BPF_SUPPORTED_GEN_FLAGS \ |
eadb4148 | 29 | (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) |
e2e9b654 | 30 | |
7d1d65cb DB |
31 | struct cls_bpf_head { |
32 | struct list_head plist; | |
76cf546c | 33 | struct idr handle_idr; |
1f947bf1 | 34 | struct rcu_head rcu; |
7d1d65cb DB |
35 | }; |
36 | ||
37 | struct cls_bpf_prog { | |
7ae457c1 | 38 | struct bpf_prog *filter; |
7d1d65cb | 39 | struct list_head link; |
e2e9b654 | 40 | struct tcf_result res; |
045efa82 | 41 | bool exts_integrated; |
0d01d45f | 42 | u32 gen_flags; |
7e916b76 | 43 | unsigned int in_hw_count; |
e2e9b654 | 44 | struct tcf_exts exts; |
7d1d65cb | 45 | u32 handle; |
55556dd5 | 46 | u16 bpf_num_ops; |
e2e9b654 DB |
47 | struct sock_filter *bpf_ops; |
48 | const char *bpf_name; | |
1f947bf1 | 49 | struct tcf_proto *tp; |
aaa908ff | 50 | struct rcu_work rwork; |
7d1d65cb DB |
51 | }; |
52 | ||
53 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
54 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 55 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 56 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 57 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
58 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
59 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
60 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
61 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
62 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
63 | }; | |
64 | ||
045efa82 DB |
65 | static int cls_bpf_exec_opcode(int code) |
66 | { | |
67 | switch (code) { | |
68 | case TC_ACT_OK: | |
045efa82 | 69 | case TC_ACT_SHOT: |
045efa82 | 70 | case TC_ACT_STOLEN: |
e25ea21f | 71 | case TC_ACT_TRAP: |
27b29f63 | 72 | case TC_ACT_REDIRECT: |
045efa82 DB |
73 | case TC_ACT_UNSPEC: |
74 | return code; | |
75 | default: | |
76 | return TC_ACT_UNSPEC; | |
77 | } | |
78 | } | |
79 | ||
7d1d65cb DB |
80 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
81 | struct tcf_result *res) | |
82 | { | |
80dcbd12 | 83 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 84 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 85 | struct cls_bpf_prog *prog; |
54720df1 | 86 | int ret = -1; |
7d1d65cb | 87 | |
54720df1 DB |
88 | /* Needed here for accessing maps. */ |
89 | rcu_read_lock(); | |
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); |
3431205e AS |
101 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
102 | __skb_pull(skb, skb->mac_len); | |
103 | } else { | |
6aaae2b6 | 104 | bpf_compute_data_pointers(skb); |
3431205e AS |
105 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
106 | } | |
7d1d65cb | 107 | |
045efa82 | 108 | if (prog->exts_integrated) { |
3a461da1 DB |
109 | res->class = 0; |
110 | res->classid = TC_H_MAJ(prog->res.classid) | | |
111 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
112 | |
113 | ret = cls_bpf_exec_opcode(filter_res); | |
114 | if (ret == TC_ACT_UNSPEC) | |
115 | continue; | |
116 | break; | |
117 | } | |
118 | ||
7d1d65cb DB |
119 | if (filter_res == 0) |
120 | continue; | |
3a461da1 DB |
121 | if (filter_res != -1) { |
122 | res->class = 0; | |
7d1d65cb | 123 | res->classid = filter_res; |
3a461da1 DB |
124 | } else { |
125 | *res = prog->res; | |
126 | } | |
7d1d65cb DB |
127 | |
128 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
129 | if (ret < 0) | |
130 | continue; | |
131 | ||
54720df1 | 132 | break; |
7d1d65cb | 133 | } |
54720df1 | 134 | rcu_read_unlock(); |
7d1d65cb | 135 | |
54720df1 | 136 | return ret; |
7d1d65cb DB |
137 | } |
138 | ||
e2e9b654 DB |
139 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
140 | { | |
141 | return !prog->bpf_ops; | |
142 | } | |
143 | ||
332ae8e2 | 144 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
631f65ff QM |
145 | struct cls_bpf_prog *oldprog, |
146 | struct netlink_ext_ack *extack) | |
332ae8e2 | 147 | { |
3f7889c4 | 148 | struct tcf_block *block = tp->chain->block; |
de4784ca | 149 | struct tc_cls_bpf_offload cls_bpf = {}; |
102740bd JK |
150 | struct cls_bpf_prog *obj; |
151 | bool skip_sw; | |
5cecb6cc | 152 | int err; |
332ae8e2 | 153 | |
102740bd JK |
154 | skip_sw = prog && tc_skip_sw(prog->gen_flags); |
155 | obj = prog ?: oldprog; | |
156 | ||
d6787147 | 157 | tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack); |
102740bd JK |
158 | cls_bpf.command = TC_CLSBPF_OFFLOAD; |
159 | cls_bpf.exts = &obj->exts; | |
160 | cls_bpf.prog = prog ? prog->filter : NULL; | |
161 | cls_bpf.oldprog = oldprog ? oldprog->filter : NULL; | |
162 | cls_bpf.name = obj->bpf_name; | |
163 | cls_bpf.exts_integrated = obj->exts_integrated; | |
332ae8e2 | 164 | |
caa72601 JP |
165 | if (oldprog) |
166 | tcf_block_offload_dec(block, &oldprog->gen_flags); | |
167 | ||
aeb3fecd | 168 | err = tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); |
102740bd | 169 | if (prog) { |
3f7889c4 | 170 | if (err < 0) { |
631f65ff | 171 | cls_bpf_offload_cmd(tp, oldprog, prog, extack); |
3f7889c4 JP |
172 | return err; |
173 | } else if (err > 0) { | |
7e916b76 | 174 | prog->in_hw_count = err; |
caa72601 | 175 | tcf_block_offload_inc(block, &prog->gen_flags); |
3f7889c4 JP |
176 | } |
177 | } | |
178 | ||
102740bd | 179 | if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) |
3f7889c4 | 180 | return -EINVAL; |
5cecb6cc | 181 | |
3f7889c4 | 182 | return 0; |
332ae8e2 JK |
183 | } |
184 | ||
ad9294db DB |
185 | static u32 cls_bpf_flags(u32 flags) |
186 | { | |
187 | return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; | |
188 | } | |
189 | ||
eadb4148 | 190 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
631f65ff QM |
191 | struct cls_bpf_prog *oldprog, |
192 | struct netlink_ext_ack *extack) | |
332ae8e2 | 193 | { |
ad9294db DB |
194 | if (prog && oldprog && |
195 | cls_bpf_flags(prog->gen_flags) != | |
196 | cls_bpf_flags(oldprog->gen_flags)) | |
102740bd | 197 | return -EINVAL; |
332ae8e2 | 198 | |
102740bd JK |
199 | if (prog && tc_skip_hw(prog->gen_flags)) |
200 | prog = NULL; | |
201 | if (oldprog && tc_skip_hw(oldprog->gen_flags)) | |
202 | oldprog = NULL; | |
203 | if (!prog && !oldprog) | |
204 | return 0; | |
eadb4148 | 205 | |
631f65ff | 206 | return cls_bpf_offload_cmd(tp, prog, oldprog, extack); |
332ae8e2 JK |
207 | } |
208 | ||
209 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
0e908a45 JK |
210 | struct cls_bpf_prog *prog, |
211 | struct netlink_ext_ack *extack) | |
332ae8e2 JK |
212 | { |
213 | int err; | |
214 | ||
0e908a45 | 215 | err = cls_bpf_offload_cmd(tp, NULL, prog, extack); |
102740bd | 216 | if (err) |
332ae8e2 | 217 | pr_err("Stopping hardware offload failed: %d\n", err); |
332ae8e2 JK |
218 | } |
219 | ||
68d64063 JK |
220 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
221 | struct cls_bpf_prog *prog) | |
222 | { | |
102740bd JK |
223 | struct tcf_block *block = tp->chain->block; |
224 | struct tc_cls_bpf_offload cls_bpf = {}; | |
225 | ||
d6787147 | 226 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); |
102740bd JK |
227 | cls_bpf.command = TC_CLSBPF_STATS; |
228 | cls_bpf.exts = &prog->exts; | |
229 | cls_bpf.prog = prog->filter; | |
230 | cls_bpf.name = prog->bpf_name; | |
231 | cls_bpf.exts_integrated = prog->exts_integrated; | |
68d64063 | 232 | |
aeb3fecd | 233 | tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false); |
68d64063 JK |
234 | } |
235 | ||
7d1d65cb DB |
236 | static int cls_bpf_init(struct tcf_proto *tp) |
237 | { | |
238 | struct cls_bpf_head *head; | |
239 | ||
240 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
241 | if (head == NULL) | |
242 | return -ENOBUFS; | |
243 | ||
1f947bf1 | 244 | INIT_LIST_HEAD_RCU(&head->plist); |
76cf546c | 245 | idr_init(&head->handle_idr); |
1f947bf1 | 246 | rcu_assign_pointer(tp->root, head); |
7d1d65cb DB |
247 | |
248 | return 0; | |
249 | } | |
250 | ||
25415cec | 251 | static void cls_bpf_free_parms(struct cls_bpf_prog *prog) |
7d1d65cb | 252 | { |
e2e9b654 DB |
253 | if (cls_bpf_is_ebpf(prog)) |
254 | bpf_prog_put(prog->filter); | |
255 | else | |
256 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 257 | |
e2e9b654 | 258 | kfree(prog->bpf_name); |
7d1d65cb | 259 | kfree(prog->bpf_ops); |
25415cec JK |
260 | } |
261 | ||
262 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) | |
263 | { | |
264 | tcf_exts_destroy(&prog->exts); | |
265 | tcf_exts_put_net(&prog->exts); | |
266 | ||
267 | cls_bpf_free_parms(prog); | |
7d1d65cb DB |
268 | kfree(prog); |
269 | } | |
270 | ||
e910af67 CW |
271 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
272 | { | |
aaa908ff CW |
273 | struct cls_bpf_prog *prog = container_of(to_rcu_work(work), |
274 | struct cls_bpf_prog, | |
275 | rwork); | |
e910af67 CW |
276 | rtnl_lock(); |
277 | __cls_bpf_delete_prog(prog); | |
278 | rtnl_unlock(); | |
279 | } | |
280 | ||
0e908a45 JK |
281 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
282 | struct netlink_ext_ack *extack) | |
7d1d65cb | 283 | { |
76cf546c CW |
284 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
285 | ||
9c160941 | 286 | idr_remove(&head->handle_idr, prog->handle); |
0e908a45 | 287 | cls_bpf_stop_offload(tp, prog, extack); |
472f5837 JP |
288 | list_del_rcu(&prog->link); |
289 | tcf_unbind_filter(tp, &prog->res); | |
aae2c35e | 290 | if (tcf_exts_get_net(&prog->exts)) |
aaa908ff | 291 | tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); |
aae2c35e CW |
292 | else |
293 | __cls_bpf_delete_prog(prog); | |
8d829bdb | 294 | } |
e2e9b654 | 295 | |
571acf21 | 296 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 297 | bool rtnl_held, struct netlink_ext_ack *extack) |
8d829bdb | 298 | { |
763dbf63 WC |
299 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
300 | ||
0e908a45 | 301 | __cls_bpf_delete(tp, arg, extack); |
763dbf63 | 302 | *last = list_empty(&head->plist); |
472f5837 | 303 | return 0; |
7d1d65cb DB |
304 | } |
305 | ||
12db03b6 | 306 | static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 307 | struct netlink_ext_ack *extack) |
7d1d65cb | 308 | { |
1f947bf1 | 309 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
310 | struct cls_bpf_prog *prog, *tmp; |
311 | ||
8d829bdb | 312 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
0e908a45 | 313 | __cls_bpf_delete(tp, prog, extack); |
7d1d65cb | 314 | |
76cf546c | 315 | idr_destroy(&head->handle_idr); |
1f947bf1 | 316 | kfree_rcu(head, rcu); |
7d1d65cb DB |
317 | } |
318 | ||
8113c095 | 319 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
7d1d65cb | 320 | { |
1f947bf1 | 321 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb | 322 | struct cls_bpf_prog *prog; |
7d1d65cb | 323 | |
3fe6b49e | 324 | list_for_each_entry(prog, &head->plist, link) { |
8113c095 WC |
325 | if (prog->handle == handle) |
326 | return prog; | |
7d1d65cb DB |
327 | } |
328 | ||
8113c095 | 329 | return NULL; |
7d1d65cb DB |
330 | } |
331 | ||
045efa82 | 332 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 333 | { |
1f947bf1 | 334 | struct sock_filter *bpf_ops; |
e2e9b654 | 335 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 336 | struct bpf_prog *fp; |
33e9fcc6 | 337 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
338 | int ret; |
339 | ||
33e9fcc6 | 340 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
341 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
342 | return -EINVAL; | |
7d1d65cb | 343 | |
33e9fcc6 | 344 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
345 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
346 | return -EINVAL; | |
7913ecf6 | 347 | |
f9562fa4 | 348 | bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); |
e2e9b654 DB |
349 | if (bpf_ops == NULL) |
350 | return -ENOMEM; | |
7d1d65cb | 351 | |
e2e9b654 DB |
352 | fprog_tmp.len = bpf_num_ops; |
353 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 354 | |
e2e9b654 DB |
355 | ret = bpf_prog_create(&fp, &fprog_tmp); |
356 | if (ret < 0) { | |
357 | kfree(bpf_ops); | |
358 | return ret; | |
359 | } | |
7d1d65cb | 360 | |
7d1d65cb | 361 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
362 | prog->bpf_num_ops = bpf_num_ops; |
363 | prog->bpf_name = NULL; | |
7d1d65cb | 364 | prog->filter = fp; |
7d1d65cb | 365 | |
e2e9b654 DB |
366 | return 0; |
367 | } | |
368 | ||
c46646d0 | 369 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
6c8dfe21 | 370 | u32 gen_flags, const struct tcf_proto *tp) |
e2e9b654 DB |
371 | { |
372 | struct bpf_prog *fp; | |
373 | char *name = NULL; | |
288b3de5 | 374 | bool skip_sw; |
e2e9b654 DB |
375 | u32 bpf_fd; |
376 | ||
377 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
288b3de5 | 378 | skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; |
e2e9b654 | 379 | |
288b3de5 | 380 | fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); |
e2e9b654 DB |
381 | if (IS_ERR(fp)) |
382 | return PTR_ERR(fp); | |
383 | ||
e2e9b654 | 384 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 385 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
386 | if (!name) { |
387 | bpf_prog_put(fp); | |
388 | return -ENOMEM; | |
389 | } | |
390 | } | |
391 | ||
392 | prog->bpf_ops = NULL; | |
e2e9b654 | 393 | prog->bpf_name = name; |
e2e9b654 | 394 | prog->filter = fp; |
e2e9b654 | 395 | |
f36fe1c4 JP |
396 | if (fp->dst_needed) |
397 | tcf_block_netif_keep_dst(tp->chain->block); | |
c46646d0 | 398 | |
e2e9b654 DB |
399 | return 0; |
400 | } | |
401 | ||
6a725c48 JP |
402 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
403 | struct cls_bpf_prog *prog, unsigned long base, | |
50a56190 AA |
404 | struct nlattr **tb, struct nlattr *est, bool ovr, |
405 | struct netlink_ext_ack *extack) | |
e2e9b654 | 406 | { |
045efa82 | 407 | bool is_bpf, is_ebpf, have_exts = false; |
0d01d45f | 408 | u32 gen_flags = 0; |
e2e9b654 DB |
409 | int ret; |
410 | ||
411 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
412 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 413 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
414 | return -EINVAL; |
415 | ||
ec6743a1 VB |
416 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true, |
417 | extack); | |
e2e9b654 DB |
418 | if (ret < 0) |
419 | return ret; | |
420 | ||
045efa82 DB |
421 | if (tb[TCA_BPF_FLAGS]) { |
422 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
423 | ||
6839da32 JP |
424 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
425 | return -EINVAL; | |
045efa82 DB |
426 | |
427 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
428 | } | |
0d01d45f JK |
429 | if (tb[TCA_BPF_FLAGS_GEN]) { |
430 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
431 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
6839da32 JP |
432 | !tc_flags_valid(gen_flags)) |
433 | return -EINVAL; | |
0d01d45f | 434 | } |
045efa82 | 435 | |
045efa82 | 436 | prog->exts_integrated = have_exts; |
0d01d45f | 437 | prog->gen_flags = gen_flags; |
e2e9b654 | 438 | |
045efa82 | 439 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
6c8dfe21 | 440 | cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); |
b9a24bb7 | 441 | if (ret < 0) |
6839da32 | 442 | return ret; |
e2e9b654 | 443 | |
ef146fa4 DB |
444 | if (tb[TCA_BPF_CLASSID]) { |
445 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
446 | tcf_bind_filter(tp, &prog->res, base); | |
447 | } | |
7d1d65cb | 448 | |
7d1d65cb | 449 | return 0; |
7d1d65cb DB |
450 | } |
451 | ||
7d1d65cb DB |
452 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, |
453 | struct tcf_proto *tp, unsigned long base, | |
454 | u32 handle, struct nlattr **tca, | |
12db03b6 VB |
455 | void **arg, bool ovr, bool rtnl_held, |
456 | struct netlink_ext_ack *extack) | |
7d1d65cb | 457 | { |
1f947bf1 | 458 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
8113c095 | 459 | struct cls_bpf_prog *oldprog = *arg; |
7d1d65cb | 460 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 461 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
462 | int ret; |
463 | ||
464 | if (tca[TCA_OPTIONS] == NULL) | |
465 | return -EINVAL; | |
466 | ||
8cb08174 JB |
467 | ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], |
468 | bpf_policy, NULL); | |
7d1d65cb DB |
469 | if (ret < 0) |
470 | return ret; | |
471 | ||
7d1d65cb | 472 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 473 | if (!prog) |
7d1d65cb DB |
474 | return -ENOBUFS; |
475 | ||
14215108 | 476 | ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); |
b9a24bb7 WC |
477 | if (ret < 0) |
478 | goto errout; | |
1f947bf1 JF |
479 | |
480 | if (oldprog) { | |
481 | if (handle && oldprog->handle != handle) { | |
482 | ret = -EINVAL; | |
483 | goto errout; | |
484 | } | |
485 | } | |
486 | ||
76cf546c | 487 | if (handle == 0) { |
0b4ce8da MW |
488 | handle = 1; |
489 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, | |
490 | INT_MAX, GFP_KERNEL); | |
491 | } else if (!oldprog) { | |
492 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, | |
493 | handle, GFP_KERNEL); | |
7d1d65cb DB |
494 | } |
495 | ||
0b4ce8da MW |
496 | if (ret) |
497 | goto errout; | |
498 | prog->handle = handle; | |
499 | ||
50a56190 AA |
500 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, |
501 | extack); | |
7d1d65cb | 502 | if (ret < 0) |
76cf546c | 503 | goto errout_idr; |
7d1d65cb | 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 JK |
525 | errout_parms: |
526 | cls_bpf_free_parms(prog); | |
76cf546c CW |
527 | errout_idr: |
528 | if (!oldprog) | |
9c160941 | 529 | idr_remove(&head->handle_idr, prog->handle); |
7d1d65cb | 530 | errout: |
b9a24bb7 | 531 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 532 | kfree(prog); |
7d1d65cb DB |
533 | return ret; |
534 | } | |
535 | ||
e2e9b654 DB |
536 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
537 | struct sk_buff *skb) | |
538 | { | |
539 | struct nlattr *nla; | |
540 | ||
541 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
542 | return -EMSGSIZE; | |
543 | ||
544 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
545 | sizeof(struct sock_filter)); | |
546 | if (nla == NULL) | |
547 | return -EMSGSIZE; | |
548 | ||
549 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
555 | struct sk_buff *skb) | |
556 | { | |
7bd509e3 DB |
557 | struct nlattr *nla; |
558 | ||
e2e9b654 DB |
559 | if (prog->bpf_name && |
560 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
561 | return -EMSGSIZE; | |
562 | ||
e8628307 DB |
563 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
564 | return -EMSGSIZE; | |
565 | ||
f1f7714e | 566 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
567 | if (nla == NULL) |
568 | return -EMSGSIZE; | |
569 | ||
f1f7714e | 570 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 571 | |
e2e9b654 DB |
572 | return 0; |
573 | } | |
574 | ||
8113c095 | 575 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 576 | struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) |
7d1d65cb | 577 | { |
8113c095 | 578 | struct cls_bpf_prog *prog = fh; |
e2e9b654 | 579 | struct nlattr *nest; |
bf007d1c | 580 | u32 bpf_flags = 0; |
e2e9b654 | 581 | int ret; |
7d1d65cb DB |
582 | |
583 | if (prog == NULL) | |
584 | return skb->len; | |
585 | ||
586 | tm->tcm_handle = prog->handle; | |
587 | ||
68d64063 JK |
588 | cls_bpf_offload_update_stats(tp, prog); |
589 | ||
ae0be8de | 590 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
7d1d65cb DB |
591 | if (nest == NULL) |
592 | goto nla_put_failure; | |
593 | ||
ef146fa4 DB |
594 | if (prog->res.classid && |
595 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 596 | goto nla_put_failure; |
7d1d65cb | 597 | |
e2e9b654 DB |
598 | if (cls_bpf_is_ebpf(prog)) |
599 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
600 | else | |
601 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
602 | if (ret) | |
7d1d65cb DB |
603 | goto nla_put_failure; |
604 | ||
5da57f42 | 605 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
606 | goto nla_put_failure; |
607 | ||
bf007d1c DB |
608 | if (prog->exts_integrated) |
609 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
610 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
611 | goto nla_put_failure; | |
0d01d45f JK |
612 | if (prog->gen_flags && |
613 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
614 | goto nla_put_failure; | |
bf007d1c | 615 | |
7d1d65cb DB |
616 | nla_nest_end(skb, nest); |
617 | ||
5da57f42 | 618 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
619 | goto nla_put_failure; |
620 | ||
621 | return skb->len; | |
622 | ||
623 | nla_put_failure: | |
624 | nla_nest_cancel(skb, nest); | |
625 | return -1; | |
626 | } | |
627 | ||
07d79fc7 CW |
628 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) |
629 | { | |
630 | struct cls_bpf_prog *prog = fh; | |
631 | ||
632 | if (prog && prog->res.classid == classid) | |
633 | prog->res.class = cl; | |
634 | } | |
635 | ||
12db03b6 VB |
636 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
637 | bool rtnl_held) | |
7d1d65cb | 638 | { |
1f947bf1 | 639 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
640 | struct cls_bpf_prog *prog; |
641 | ||
3fe6b49e | 642 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
643 | if (arg->count < arg->skip) |
644 | goto skip; | |
8113c095 | 645 | if (arg->fn(tp, prog, arg) < 0) { |
7d1d65cb DB |
646 | arg->stop = 1; |
647 | break; | |
648 | } | |
649 | skip: | |
650 | arg->count++; | |
651 | } | |
652 | } | |
653 | ||
a7323311 | 654 | static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, |
7e916b76 JH |
655 | void *cb_priv, struct netlink_ext_ack *extack) |
656 | { | |
657 | struct cls_bpf_head *head = rtnl_dereference(tp->root); | |
658 | struct tcf_block *block = tp->chain->block; | |
659 | struct tc_cls_bpf_offload cls_bpf = {}; | |
660 | struct cls_bpf_prog *prog; | |
661 | int err; | |
662 | ||
663 | list_for_each_entry(prog, &head->plist, link) { | |
664 | if (tc_skip_hw(prog->gen_flags)) | |
665 | continue; | |
666 | ||
667 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, | |
d6787147 | 668 | extack); |
7e916b76 JH |
669 | cls_bpf.command = TC_CLSBPF_OFFLOAD; |
670 | cls_bpf.exts = &prog->exts; | |
671 | cls_bpf.prog = add ? prog->filter : NULL; | |
672 | cls_bpf.oldprog = add ? NULL : prog->filter; | |
673 | cls_bpf.name = prog->bpf_name; | |
674 | cls_bpf.exts_integrated = prog->exts_integrated; | |
675 | ||
676 | err = cb(TC_SETUP_CLSBPF, &cls_bpf, cb_priv); | |
677 | if (err) { | |
678 | if (add && tc_skip_sw(prog->gen_flags)) | |
679 | return err; | |
680 | continue; | |
681 | } | |
682 | ||
683 | tc_cls_offload_cnt_update(block, &prog->in_hw_count, | |
684 | &prog->gen_flags, add); | |
685 | } | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
7d1d65cb DB |
690 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { |
691 | .kind = "bpf", | |
692 | .owner = THIS_MODULE, | |
693 | .classify = cls_bpf_classify, | |
694 | .init = cls_bpf_init, | |
695 | .destroy = cls_bpf_destroy, | |
696 | .get = cls_bpf_get, | |
7d1d65cb DB |
697 | .change = cls_bpf_change, |
698 | .delete = cls_bpf_delete, | |
699 | .walk = cls_bpf_walk, | |
7e916b76 | 700 | .reoffload = cls_bpf_reoffload, |
7d1d65cb | 701 | .dump = cls_bpf_dump, |
07d79fc7 | 702 | .bind_class = cls_bpf_bind_class, |
7d1d65cb DB |
703 | }; |
704 | ||
705 | static int __init cls_bpf_init_mod(void) | |
706 | { | |
707 | return register_tcf_proto_ops(&cls_bpf_ops); | |
708 | } | |
709 | ||
710 | static void __exit cls_bpf_exit_mod(void) | |
711 | { | |
712 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
713 | } | |
714 | ||
715 | module_init(cls_bpf_init_mod); | |
716 | module_exit(cls_bpf_exit_mod); |