Commit | Line | Data |
---|---|---|
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; |
7e916b76 | 46 | unsigned int in_hw_count; |
e2e9b654 | 47 | struct tcf_exts exts; |
7d1d65cb | 48 | u32 handle; |
55556dd5 | 49 | u16 bpf_num_ops; |
e2e9b654 DB |
50 | struct sock_filter *bpf_ops; |
51 | const char *bpf_name; | |
1f947bf1 | 52 | struct tcf_proto *tp; |
aaa908ff | 53 | struct rcu_work rwork; |
7d1d65cb DB |
54 | }; |
55 | ||
56 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { | |
57 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, | |
045efa82 | 58 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
0d01d45f | 59 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
e2e9b654 | 60 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
5a7a5555 JHS |
61 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
62 | .len = CLS_BPF_NAME_LEN }, | |
7d1d65cb DB |
63 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
64 | [TCA_BPF_OPS] = { .type = NLA_BINARY, | |
65 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, | |
66 | }; | |
67 | ||
045efa82 DB |
68 | static int cls_bpf_exec_opcode(int code) |
69 | { | |
70 | switch (code) { | |
71 | case TC_ACT_OK: | |
045efa82 | 72 | case TC_ACT_SHOT: |
045efa82 | 73 | case TC_ACT_STOLEN: |
e25ea21f | 74 | case TC_ACT_TRAP: |
27b29f63 | 75 | case TC_ACT_REDIRECT: |
045efa82 DB |
76 | case TC_ACT_UNSPEC: |
77 | return code; | |
78 | default: | |
79 | return TC_ACT_UNSPEC; | |
80 | } | |
81 | } | |
82 | ||
7d1d65cb DB |
83 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
84 | struct tcf_result *res) | |
85 | { | |
80dcbd12 | 86 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
fdc5432a | 87 | bool at_ingress = skb_at_tc_ingress(skb); |
7d1d65cb | 88 | struct cls_bpf_prog *prog; |
54720df1 | 89 | int ret = -1; |
7d1d65cb | 90 | |
54720df1 DB |
91 | /* Needed here for accessing maps. */ |
92 | rcu_read_lock(); | |
1f947bf1 | 93 | list_for_each_entry_rcu(prog, &head->plist, link) { |
3431205e AS |
94 | int filter_res; |
95 | ||
045efa82 DB |
96 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
97 | ||
eadb4148 JK |
98 | if (tc_skip_sw(prog->gen_flags)) { |
99 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; | |
100 | } else if (at_ingress) { | |
3431205e AS |
101 | /* It is safe to push/pull even if skb_shared() */ |
102 | __skb_push(skb, skb->mac_len); | |
6aaae2b6 | 103 | bpf_compute_data_pointers(skb); |
3431205e AS |
104 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
105 | __skb_pull(skb, skb->mac_len); | |
106 | } else { | |
6aaae2b6 | 107 | bpf_compute_data_pointers(skb); |
3431205e AS |
108 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
109 | } | |
7d1d65cb | 110 | |
045efa82 | 111 | if (prog->exts_integrated) { |
3a461da1 DB |
112 | res->class = 0; |
113 | res->classid = TC_H_MAJ(prog->res.classid) | | |
114 | qdisc_skb_cb(skb)->tc_classid; | |
045efa82 DB |
115 | |
116 | ret = cls_bpf_exec_opcode(filter_res); | |
117 | if (ret == TC_ACT_UNSPEC) | |
118 | continue; | |
119 | break; | |
120 | } | |
121 | ||
7d1d65cb DB |
122 | if (filter_res == 0) |
123 | continue; | |
3a461da1 DB |
124 | if (filter_res != -1) { |
125 | res->class = 0; | |
7d1d65cb | 126 | res->classid = filter_res; |
3a461da1 DB |
127 | } else { |
128 | *res = prog->res; | |
129 | } | |
7d1d65cb DB |
130 | |
131 | ret = tcf_exts_exec(skb, &prog->exts, res); | |
132 | if (ret < 0) | |
133 | continue; | |
134 | ||
54720df1 | 135 | break; |
7d1d65cb | 136 | } |
54720df1 | 137 | rcu_read_unlock(); |
7d1d65cb | 138 | |
54720df1 | 139 | return ret; |
7d1d65cb DB |
140 | } |
141 | ||
e2e9b654 DB |
142 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
143 | { | |
144 | return !prog->bpf_ops; | |
145 | } | |
146 | ||
332ae8e2 | 147 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
631f65ff QM |
148 | struct cls_bpf_prog *oldprog, |
149 | struct netlink_ext_ack *extack) | |
332ae8e2 | 150 | { |
3f7889c4 | 151 | struct tcf_block *block = tp->chain->block; |
de4784ca | 152 | struct tc_cls_bpf_offload cls_bpf = {}; |
102740bd JK |
153 | struct cls_bpf_prog *obj; |
154 | bool skip_sw; | |
5cecb6cc | 155 | int err; |
332ae8e2 | 156 | |
102740bd JK |
157 | skip_sw = prog && tc_skip_sw(prog->gen_flags); |
158 | obj = prog ?: oldprog; | |
159 | ||
a6ffd6b5 JK |
160 | tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, |
161 | extack); | |
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; | |
332ae8e2 | 168 | |
caa72601 JP |
169 | if (oldprog) |
170 | tcf_block_offload_dec(block, &oldprog->gen_flags); | |
171 | ||
aeb3fecd | 172 | err = tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); |
102740bd | 173 | if (prog) { |
3f7889c4 | 174 | if (err < 0) { |
631f65ff | 175 | cls_bpf_offload_cmd(tp, oldprog, prog, extack); |
3f7889c4 JP |
176 | return err; |
177 | } else if (err > 0) { | |
7e916b76 | 178 | prog->in_hw_count = err; |
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 | 194 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
631f65ff QM |
195 | struct cls_bpf_prog *oldprog, |
196 | struct netlink_ext_ack *extack) | |
332ae8e2 | 197 | { |
ad9294db DB |
198 | if (prog && oldprog && |
199 | cls_bpf_flags(prog->gen_flags) != | |
200 | cls_bpf_flags(oldprog->gen_flags)) | |
102740bd | 201 | return -EINVAL; |
332ae8e2 | 202 | |
102740bd JK |
203 | if (prog && tc_skip_hw(prog->gen_flags)) |
204 | prog = NULL; | |
205 | if (oldprog && tc_skip_hw(oldprog->gen_flags)) | |
206 | oldprog = NULL; | |
207 | if (!prog && !oldprog) | |
208 | return 0; | |
eadb4148 | 209 | |
631f65ff | 210 | return cls_bpf_offload_cmd(tp, prog, oldprog, extack); |
332ae8e2 JK |
211 | } |
212 | ||
213 | static void cls_bpf_stop_offload(struct tcf_proto *tp, | |
0e908a45 JK |
214 | struct cls_bpf_prog *prog, |
215 | struct netlink_ext_ack *extack) | |
332ae8e2 JK |
216 | { |
217 | int err; | |
218 | ||
0e908a45 | 219 | err = cls_bpf_offload_cmd(tp, NULL, prog, extack); |
102740bd | 220 | if (err) |
332ae8e2 | 221 | pr_err("Stopping hardware offload failed: %d\n", err); |
332ae8e2 JK |
222 | } |
223 | ||
68d64063 JK |
224 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
225 | struct cls_bpf_prog *prog) | |
226 | { | |
102740bd JK |
227 | struct tcf_block *block = tp->chain->block; |
228 | struct tc_cls_bpf_offload cls_bpf = {}; | |
229 | ||
a6ffd6b5 | 230 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); |
102740bd JK |
231 | cls_bpf.command = TC_CLSBPF_STATS; |
232 | cls_bpf.exts = &prog->exts; | |
233 | cls_bpf.prog = prog->filter; | |
234 | cls_bpf.name = prog->bpf_name; | |
235 | cls_bpf.exts_integrated = prog->exts_integrated; | |
68d64063 | 236 | |
aeb3fecd | 237 | tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false); |
68d64063 JK |
238 | } |
239 | ||
7d1d65cb DB |
240 | static int cls_bpf_init(struct tcf_proto *tp) |
241 | { | |
242 | struct cls_bpf_head *head; | |
243 | ||
244 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
245 | if (head == NULL) | |
246 | return -ENOBUFS; | |
247 | ||
1f947bf1 | 248 | INIT_LIST_HEAD_RCU(&head->plist); |
76cf546c | 249 | idr_init(&head->handle_idr); |
1f947bf1 | 250 | rcu_assign_pointer(tp->root, head); |
7d1d65cb DB |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
25415cec | 255 | static void cls_bpf_free_parms(struct cls_bpf_prog *prog) |
7d1d65cb | 256 | { |
e2e9b654 DB |
257 | if (cls_bpf_is_ebpf(prog)) |
258 | bpf_prog_put(prog->filter); | |
259 | else | |
260 | bpf_prog_destroy(prog->filter); | |
7d1d65cb | 261 | |
e2e9b654 | 262 | kfree(prog->bpf_name); |
7d1d65cb | 263 | kfree(prog->bpf_ops); |
25415cec JK |
264 | } |
265 | ||
266 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) | |
267 | { | |
268 | tcf_exts_destroy(&prog->exts); | |
269 | tcf_exts_put_net(&prog->exts); | |
270 | ||
271 | cls_bpf_free_parms(prog); | |
7d1d65cb DB |
272 | kfree(prog); |
273 | } | |
274 | ||
e910af67 CW |
275 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
276 | { | |
aaa908ff CW |
277 | struct cls_bpf_prog *prog = container_of(to_rcu_work(work), |
278 | struct cls_bpf_prog, | |
279 | rwork); | |
e910af67 CW |
280 | rtnl_lock(); |
281 | __cls_bpf_delete_prog(prog); | |
282 | rtnl_unlock(); | |
283 | } | |
284 | ||
0e908a45 JK |
285 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
286 | struct netlink_ext_ack *extack) | |
7d1d65cb | 287 | { |
76cf546c CW |
288 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
289 | ||
9c160941 | 290 | idr_remove(&head->handle_idr, prog->handle); |
0e908a45 | 291 | cls_bpf_stop_offload(tp, prog, extack); |
472f5837 JP |
292 | list_del_rcu(&prog->link); |
293 | tcf_unbind_filter(tp, &prog->res); | |
aae2c35e | 294 | if (tcf_exts_get_net(&prog->exts)) |
aaa908ff | 295 | tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); |
aae2c35e CW |
296 | else |
297 | __cls_bpf_delete_prog(prog); | |
8d829bdb | 298 | } |
e2e9b654 | 299 | |
571acf21 | 300 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 301 | bool rtnl_held, struct netlink_ext_ack *extack) |
8d829bdb | 302 | { |
763dbf63 WC |
303 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
304 | ||
0e908a45 | 305 | __cls_bpf_delete(tp, arg, extack); |
763dbf63 | 306 | *last = list_empty(&head->plist); |
472f5837 | 307 | return 0; |
7d1d65cb DB |
308 | } |
309 | ||
12db03b6 | 310 | static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 311 | struct netlink_ext_ack *extack) |
7d1d65cb | 312 | { |
1f947bf1 | 313 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
314 | struct cls_bpf_prog *prog, *tmp; |
315 | ||
8d829bdb | 316 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
0e908a45 | 317 | __cls_bpf_delete(tp, prog, extack); |
7d1d65cb | 318 | |
76cf546c | 319 | idr_destroy(&head->handle_idr); |
1f947bf1 | 320 | kfree_rcu(head, rcu); |
7d1d65cb DB |
321 | } |
322 | ||
8113c095 | 323 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
7d1d65cb | 324 | { |
1f947bf1 | 325 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb | 326 | struct cls_bpf_prog *prog; |
7d1d65cb | 327 | |
3fe6b49e | 328 | list_for_each_entry(prog, &head->plist, link) { |
8113c095 WC |
329 | if (prog->handle == handle) |
330 | return prog; | |
7d1d65cb DB |
331 | } |
332 | ||
8113c095 | 333 | return NULL; |
7d1d65cb DB |
334 | } |
335 | ||
045efa82 | 336 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
7d1d65cb | 337 | { |
1f947bf1 | 338 | struct sock_filter *bpf_ops; |
e2e9b654 | 339 | struct sock_fprog_kern fprog_tmp; |
1f947bf1 | 340 | struct bpf_prog *fp; |
33e9fcc6 | 341 | u16 bpf_size, bpf_num_ops; |
7d1d65cb DB |
342 | int ret; |
343 | ||
33e9fcc6 | 344 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
e2e9b654 DB |
345 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
346 | return -EINVAL; | |
7d1d65cb | 347 | |
33e9fcc6 | 348 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
e2e9b654 DB |
349 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
350 | return -EINVAL; | |
7913ecf6 | 351 | |
f9562fa4 | 352 | bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); |
e2e9b654 DB |
353 | if (bpf_ops == NULL) |
354 | return -ENOMEM; | |
7d1d65cb | 355 | |
e2e9b654 DB |
356 | fprog_tmp.len = bpf_num_ops; |
357 | fprog_tmp.filter = bpf_ops; | |
7d1d65cb | 358 | |
e2e9b654 DB |
359 | ret = bpf_prog_create(&fp, &fprog_tmp); |
360 | if (ret < 0) { | |
361 | kfree(bpf_ops); | |
362 | return ret; | |
363 | } | |
7d1d65cb | 364 | |
7d1d65cb | 365 | prog->bpf_ops = bpf_ops; |
e2e9b654 DB |
366 | prog->bpf_num_ops = bpf_num_ops; |
367 | prog->bpf_name = NULL; | |
7d1d65cb | 368 | prog->filter = fp; |
7d1d65cb | 369 | |
e2e9b654 DB |
370 | return 0; |
371 | } | |
372 | ||
c46646d0 | 373 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
6c8dfe21 | 374 | u32 gen_flags, const struct tcf_proto *tp) |
e2e9b654 DB |
375 | { |
376 | struct bpf_prog *fp; | |
377 | char *name = NULL; | |
288b3de5 | 378 | bool skip_sw; |
e2e9b654 DB |
379 | u32 bpf_fd; |
380 | ||
381 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); | |
288b3de5 | 382 | skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; |
e2e9b654 | 383 | |
288b3de5 | 384 | fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); |
e2e9b654 DB |
385 | if (IS_ERR(fp)) |
386 | return PTR_ERR(fp); | |
387 | ||
e2e9b654 | 388 | if (tb[TCA_BPF_NAME]) { |
b15ca182 | 389 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
e2e9b654 DB |
390 | if (!name) { |
391 | bpf_prog_put(fp); | |
392 | return -ENOMEM; | |
393 | } | |
394 | } | |
395 | ||
396 | prog->bpf_ops = NULL; | |
e2e9b654 | 397 | prog->bpf_name = name; |
e2e9b654 | 398 | prog->filter = fp; |
e2e9b654 | 399 | |
f36fe1c4 JP |
400 | if (fp->dst_needed) |
401 | tcf_block_netif_keep_dst(tp->chain->block); | |
c46646d0 | 402 | |
e2e9b654 DB |
403 | return 0; |
404 | } | |
405 | ||
6a725c48 JP |
406 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
407 | struct cls_bpf_prog *prog, unsigned long base, | |
50a56190 AA |
408 | struct nlattr **tb, struct nlattr *est, bool ovr, |
409 | struct netlink_ext_ack *extack) | |
e2e9b654 | 410 | { |
045efa82 | 411 | bool is_bpf, is_ebpf, have_exts = false; |
0d01d45f | 412 | u32 gen_flags = 0; |
e2e9b654 DB |
413 | int ret; |
414 | ||
415 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; | |
416 | is_ebpf = tb[TCA_BPF_FD]; | |
ef146fa4 | 417 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
e2e9b654 DB |
418 | return -EINVAL; |
419 | ||
ec6743a1 VB |
420 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true, |
421 | extack); | |
e2e9b654 DB |
422 | if (ret < 0) |
423 | return ret; | |
424 | ||
045efa82 DB |
425 | if (tb[TCA_BPF_FLAGS]) { |
426 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); | |
427 | ||
6839da32 JP |
428 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
429 | return -EINVAL; | |
045efa82 DB |
430 | |
431 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; | |
432 | } | |
0d01d45f JK |
433 | if (tb[TCA_BPF_FLAGS_GEN]) { |
434 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); | |
435 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || | |
6839da32 JP |
436 | !tc_flags_valid(gen_flags)) |
437 | return -EINVAL; | |
0d01d45f | 438 | } |
045efa82 | 439 | |
045efa82 | 440 | prog->exts_integrated = have_exts; |
0d01d45f | 441 | prog->gen_flags = gen_flags; |
e2e9b654 | 442 | |
045efa82 | 443 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
6c8dfe21 | 444 | cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); |
b9a24bb7 | 445 | if (ret < 0) |
6839da32 | 446 | return ret; |
e2e9b654 | 447 | |
ef146fa4 DB |
448 | if (tb[TCA_BPF_CLASSID]) { |
449 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); | |
450 | tcf_bind_filter(tp, &prog->res, base); | |
451 | } | |
7d1d65cb | 452 | |
7d1d65cb | 453 | return 0; |
7d1d65cb DB |
454 | } |
455 | ||
7d1d65cb DB |
456 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, |
457 | struct tcf_proto *tp, unsigned long base, | |
458 | u32 handle, struct nlattr **tca, | |
12db03b6 VB |
459 | void **arg, bool ovr, bool rtnl_held, |
460 | struct netlink_ext_ack *extack) | |
7d1d65cb | 461 | { |
1f947bf1 | 462 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
8113c095 | 463 | struct cls_bpf_prog *oldprog = *arg; |
7d1d65cb | 464 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
1f947bf1 | 465 | struct cls_bpf_prog *prog; |
7d1d65cb DB |
466 | int ret; |
467 | ||
468 | if (tca[TCA_OPTIONS] == NULL) | |
469 | return -EINVAL; | |
470 | ||
fceb6435 JB |
471 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
472 | NULL); | |
7d1d65cb DB |
473 | if (ret < 0) |
474 | return ret; | |
475 | ||
7d1d65cb | 476 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
1f947bf1 | 477 | if (!prog) |
7d1d65cb DB |
478 | return -ENOBUFS; |
479 | ||
14215108 | 480 | ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); |
b9a24bb7 WC |
481 | if (ret < 0) |
482 | goto errout; | |
1f947bf1 JF |
483 | |
484 | if (oldprog) { | |
485 | if (handle && oldprog->handle != handle) { | |
486 | ret = -EINVAL; | |
487 | goto errout; | |
488 | } | |
489 | } | |
490 | ||
76cf546c | 491 | if (handle == 0) { |
0b4ce8da MW |
492 | handle = 1; |
493 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, | |
494 | INT_MAX, GFP_KERNEL); | |
495 | } else if (!oldprog) { | |
496 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, | |
497 | handle, GFP_KERNEL); | |
7d1d65cb DB |
498 | } |
499 | ||
0b4ce8da MW |
500 | if (ret) |
501 | goto errout; | |
502 | prog->handle = handle; | |
503 | ||
50a56190 AA |
504 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, |
505 | extack); | |
7d1d65cb | 506 | if (ret < 0) |
76cf546c | 507 | goto errout_idr; |
7d1d65cb | 508 | |
631f65ff | 509 | ret = cls_bpf_offload(tp, prog, oldprog, extack); |
25415cec JK |
510 | if (ret) |
511 | goto errout_parms; | |
332ae8e2 | 512 | |
5cecb6cc OG |
513 | if (!tc_in_hw(prog->gen_flags)) |
514 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
515 | ||
1f947bf1 | 516 | if (oldprog) { |
234a4624 | 517 | idr_replace(&head->handle_idr, prog, handle); |
f6bfc46d | 518 | list_replace_rcu(&oldprog->link, &prog->link); |
18cdb37e | 519 | tcf_unbind_filter(tp, &oldprog->res); |
aae2c35e | 520 | tcf_exts_get_net(&oldprog->exts); |
aaa908ff | 521 | tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); |
1f947bf1 JF |
522 | } else { |
523 | list_add_rcu(&prog->link, &head->plist); | |
524 | } | |
7d1d65cb | 525 | |
8113c095 | 526 | *arg = prog; |
7d1d65cb | 527 | return 0; |
b9a24bb7 | 528 | |
25415cec JK |
529 | errout_parms: |
530 | cls_bpf_free_parms(prog); | |
76cf546c CW |
531 | errout_idr: |
532 | if (!oldprog) | |
9c160941 | 533 | idr_remove(&head->handle_idr, prog->handle); |
7d1d65cb | 534 | errout: |
b9a24bb7 | 535 | tcf_exts_destroy(&prog->exts); |
1f947bf1 | 536 | kfree(prog); |
7d1d65cb DB |
537 | return ret; |
538 | } | |
539 | ||
e2e9b654 DB |
540 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
541 | struct sk_buff *skb) | |
542 | { | |
543 | struct nlattr *nla; | |
544 | ||
545 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) | |
546 | return -EMSGSIZE; | |
547 | ||
548 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * | |
549 | sizeof(struct sock_filter)); | |
550 | if (nla == NULL) | |
551 | return -EMSGSIZE; | |
552 | ||
553 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, | |
559 | struct sk_buff *skb) | |
560 | { | |
7bd509e3 DB |
561 | struct nlattr *nla; |
562 | ||
e2e9b654 DB |
563 | if (prog->bpf_name && |
564 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) | |
565 | return -EMSGSIZE; | |
566 | ||
e8628307 DB |
567 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
568 | return -EMSGSIZE; | |
569 | ||
f1f7714e | 570 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
7bd509e3 DB |
571 | if (nla == NULL) |
572 | return -EMSGSIZE; | |
573 | ||
f1f7714e | 574 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
7bd509e3 | 575 | |
e2e9b654 DB |
576 | return 0; |
577 | } | |
578 | ||
8113c095 | 579 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 580 | struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) |
7d1d65cb | 581 | { |
8113c095 | 582 | struct cls_bpf_prog *prog = fh; |
e2e9b654 | 583 | struct nlattr *nest; |
bf007d1c | 584 | u32 bpf_flags = 0; |
e2e9b654 | 585 | int ret; |
7d1d65cb DB |
586 | |
587 | if (prog == NULL) | |
588 | return skb->len; | |
589 | ||
590 | tm->tcm_handle = prog->handle; | |
591 | ||
68d64063 JK |
592 | cls_bpf_offload_update_stats(tp, prog); |
593 | ||
7d1d65cb DB |
594 | nest = nla_nest_start(skb, TCA_OPTIONS); |
595 | if (nest == NULL) | |
596 | goto nla_put_failure; | |
597 | ||
ef146fa4 DB |
598 | if (prog->res.classid && |
599 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) | |
7d1d65cb | 600 | goto nla_put_failure; |
7d1d65cb | 601 | |
e2e9b654 DB |
602 | if (cls_bpf_is_ebpf(prog)) |
603 | ret = cls_bpf_dump_ebpf_info(prog, skb); | |
604 | else | |
605 | ret = cls_bpf_dump_bpf_info(prog, skb); | |
606 | if (ret) | |
7d1d65cb DB |
607 | goto nla_put_failure; |
608 | ||
5da57f42 | 609 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
7d1d65cb DB |
610 | goto nla_put_failure; |
611 | ||
bf007d1c DB |
612 | if (prog->exts_integrated) |
613 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; | |
614 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) | |
615 | goto nla_put_failure; | |
0d01d45f JK |
616 | if (prog->gen_flags && |
617 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) | |
618 | goto nla_put_failure; | |
bf007d1c | 619 | |
7d1d65cb DB |
620 | nla_nest_end(skb, nest); |
621 | ||
5da57f42 | 622 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
7d1d65cb DB |
623 | goto nla_put_failure; |
624 | ||
625 | return skb->len; | |
626 | ||
627 | nla_put_failure: | |
628 | nla_nest_cancel(skb, nest); | |
629 | return -1; | |
630 | } | |
631 | ||
07d79fc7 CW |
632 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) |
633 | { | |
634 | struct cls_bpf_prog *prog = fh; | |
635 | ||
636 | if (prog && prog->res.classid == classid) | |
637 | prog->res.class = cl; | |
638 | } | |
639 | ||
12db03b6 VB |
640 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
641 | bool rtnl_held) | |
7d1d65cb | 642 | { |
1f947bf1 | 643 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
7d1d65cb DB |
644 | struct cls_bpf_prog *prog; |
645 | ||
3fe6b49e | 646 | list_for_each_entry(prog, &head->plist, link) { |
7d1d65cb DB |
647 | if (arg->count < arg->skip) |
648 | goto skip; | |
8113c095 | 649 | if (arg->fn(tp, prog, arg) < 0) { |
7d1d65cb DB |
650 | arg->stop = 1; |
651 | break; | |
652 | } | |
653 | skip: | |
654 | arg->count++; | |
655 | } | |
656 | } | |
657 | ||
7e916b76 JH |
658 | static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb, |
659 | void *cb_priv, struct netlink_ext_ack *extack) | |
660 | { | |
661 | struct cls_bpf_head *head = rtnl_dereference(tp->root); | |
662 | struct tcf_block *block = tp->chain->block; | |
663 | struct tc_cls_bpf_offload cls_bpf = {}; | |
664 | struct cls_bpf_prog *prog; | |
665 | int err; | |
666 | ||
667 | list_for_each_entry(prog, &head->plist, link) { | |
668 | if (tc_skip_hw(prog->gen_flags)) | |
669 | continue; | |
670 | ||
671 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, | |
672 | extack); | |
673 | cls_bpf.command = TC_CLSBPF_OFFLOAD; | |
674 | cls_bpf.exts = &prog->exts; | |
675 | cls_bpf.prog = add ? prog->filter : NULL; | |
676 | cls_bpf.oldprog = add ? NULL : prog->filter; | |
677 | cls_bpf.name = prog->bpf_name; | |
678 | cls_bpf.exts_integrated = prog->exts_integrated; | |
679 | ||
680 | err = cb(TC_SETUP_CLSBPF, &cls_bpf, cb_priv); | |
681 | if (err) { | |
682 | if (add && tc_skip_sw(prog->gen_flags)) | |
683 | return err; | |
684 | continue; | |
685 | } | |
686 | ||
687 | tc_cls_offload_cnt_update(block, &prog->in_hw_count, | |
688 | &prog->gen_flags, add); | |
689 | } | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
7d1d65cb DB |
694 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { |
695 | .kind = "bpf", | |
696 | .owner = THIS_MODULE, | |
697 | .classify = cls_bpf_classify, | |
698 | .init = cls_bpf_init, | |
699 | .destroy = cls_bpf_destroy, | |
700 | .get = cls_bpf_get, | |
7d1d65cb DB |
701 | .change = cls_bpf_change, |
702 | .delete = cls_bpf_delete, | |
703 | .walk = cls_bpf_walk, | |
7e916b76 | 704 | .reoffload = cls_bpf_reoffload, |
7d1d65cb | 705 | .dump = cls_bpf_dump, |
07d79fc7 | 706 | .bind_class = cls_bpf_bind_class, |
7d1d65cb DB |
707 | }; |
708 | ||
709 | static int __init cls_bpf_init_mod(void) | |
710 | { | |
711 | return register_tcf_proto_ops(&cls_bpf_ops); | |
712 | } | |
713 | ||
714 | static void __exit cls_bpf_exit_mod(void) | |
715 | { | |
716 | unregister_tcf_proto_ops(&cls_bpf_ops); | |
717 | } | |
718 | ||
719 | module_init(cls_bpf_init_mod); | |
720 | module_exit(cls_bpf_exit_mod); |