1 /* 1 /*
2 * Copyright (C) 2017-2018 Netronome Systems, 2 * Copyright (C) 2017-2018 Netronome Systems, Inc.
3 * 3 *
4 * This software is licensed under the GNU Gen 4 * This software is licensed under the GNU General License Version 2,
5 * June 1991 as shown in the file COPYING in t 5 * June 1991 as shown in the file COPYING in the top-level directory of this
6 * source tree. 6 * source tree.
7 * 7 *
8 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 8 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
9 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRES 9 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
10 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 10 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK A 11 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
12 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROG 12 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
13 * THE COST OF ALL NECESSARY SERVICING, REPAIR 13 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
14 */ 14 */
15 15
16 #include <linux/bpf.h> 16 #include <linux/bpf.h>
17 #include <linux/bpf_verifier.h> 17 #include <linux/bpf_verifier.h>
18 #include <linux/bug.h> 18 #include <linux/bug.h>
19 #include <linux/kdev_t.h> 19 #include <linux/kdev_t.h>
20 #include <linux/list.h> 20 #include <linux/list.h>
21 #include <linux/lockdep.h> 21 #include <linux/lockdep.h>
22 #include <linux/netdevice.h> 22 #include <linux/netdevice.h>
23 #include <linux/printk.h> 23 #include <linux/printk.h>
24 #include <linux/proc_ns.h> 24 #include <linux/proc_ns.h>
25 #include <linux/rhashtable.h> 25 #include <linux/rhashtable.h>
26 #include <linux/rtnetlink.h> 26 #include <linux/rtnetlink.h>
27 #include <linux/rwsem.h> 27 #include <linux/rwsem.h>
28 #include <net/xdp.h> <<
29 28
30 /* Protects offdevs, members of bpf_offload_ne 29 /* Protects offdevs, members of bpf_offload_netdev and offload members
31 * of all progs. 30 * of all progs.
32 * RTNL lock cannot be taken when holding this 31 * RTNL lock cannot be taken when holding this lock.
33 */ 32 */
34 static DECLARE_RWSEM(bpf_devs_lock); 33 static DECLARE_RWSEM(bpf_devs_lock);
35 34
36 struct bpf_offload_dev { 35 struct bpf_offload_dev {
37 const struct bpf_prog_offload_ops *ops 36 const struct bpf_prog_offload_ops *ops;
38 struct list_head netdevs; 37 struct list_head netdevs;
39 void *priv; 38 void *priv;
40 }; 39 };
41 40
42 struct bpf_offload_netdev { 41 struct bpf_offload_netdev {
43 struct rhash_head l; 42 struct rhash_head l;
44 struct net_device *netdev; 43 struct net_device *netdev;
45 struct bpf_offload_dev *offdev; /* NUL !! 44 struct bpf_offload_dev *offdev;
46 struct list_head progs; 45 struct list_head progs;
47 struct list_head maps; 46 struct list_head maps;
48 struct list_head offdev_netdevs; 47 struct list_head offdev_netdevs;
49 }; 48 };
50 49
51 static const struct rhashtable_params offdevs_ 50 static const struct rhashtable_params offdevs_params = {
52 .nelem_hint = 4, 51 .nelem_hint = 4,
53 .key_len = sizeof(struc 52 .key_len = sizeof(struct net_device *),
54 .key_offset = offsetof(str 53 .key_offset = offsetof(struct bpf_offload_netdev, netdev),
55 .head_offset = offsetof(str 54 .head_offset = offsetof(struct bpf_offload_netdev, l),
56 .automatic_shrinking = true, 55 .automatic_shrinking = true,
57 }; 56 };
58 57
59 static struct rhashtable offdevs; 58 static struct rhashtable offdevs;
>> 59 static bool offdevs_inited;
60 60
61 static int bpf_dev_offload_check(struct net_de 61 static int bpf_dev_offload_check(struct net_device *netdev)
62 { 62 {
63 if (!netdev) 63 if (!netdev)
64 return -EINVAL; 64 return -EINVAL;
65 if (!netdev->netdev_ops->ndo_bpf) 65 if (!netdev->netdev_ops->ndo_bpf)
66 return -EOPNOTSUPP; 66 return -EOPNOTSUPP;
67 return 0; 67 return 0;
68 } 68 }
69 69
70 static struct bpf_offload_netdev * 70 static struct bpf_offload_netdev *
71 bpf_offload_find_netdev(struct net_device *net 71 bpf_offload_find_netdev(struct net_device *netdev)
72 { 72 {
73 lockdep_assert_held(&bpf_devs_lock); 73 lockdep_assert_held(&bpf_devs_lock);
74 74
>> 75 if (!offdevs_inited)
>> 76 return NULL;
75 return rhashtable_lookup_fast(&offdevs 77 return rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params);
76 } 78 }
77 79
78 static int __bpf_offload_dev_netdev_register(s !! 80 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
79 s <<
80 { 81 {
81 struct bpf_offload_netdev *ondev; 82 struct bpf_offload_netdev *ondev;
>> 83 struct bpf_prog_offload *offload;
82 int err; 84 int err;
83 85
84 ondev = kzalloc(sizeof(*ondev), GFP_KE !! 86 if (attr->prog_type != BPF_PROG_TYPE_SCHED_CLS &&
85 if (!ondev) !! 87 attr->prog_type != BPF_PROG_TYPE_XDP)
86 return -ENOMEM; !! 88 return -EINVAL;
87 <<
88 ondev->netdev = netdev; <<
89 ondev->offdev = offdev; <<
90 INIT_LIST_HEAD(&ondev->progs); <<
91 INIT_LIST_HEAD(&ondev->maps); <<
92 <<
93 err = rhashtable_insert_fast(&offdevs, <<
94 if (err) { <<
95 netdev_warn(netdev, "failed to <<
96 goto err_free; <<
97 } <<
98 <<
99 if (offdev) <<
100 list_add(&ondev->offdev_netdev <<
101 return 0; <<
102 <<
103 err_free: <<
104 kfree(ondev); <<
105 return err; <<
106 } <<
107 <<
108 static void __bpf_prog_offload_destroy(struct <<
109 { <<
110 struct bpf_prog_offload *offload = pro <<
111 <<
112 if (offload->dev_state) <<
113 offload->offdev->ops->destroy( <<
114 <<
115 list_del_init(&offload->offloads); <<
116 kfree(offload); <<
117 prog->aux->offload = NULL; <<
118 } <<
119 <<
120 static int bpf_map_offload_ndo(struct bpf_offl <<
121 enum bpf_netdev <<
122 { <<
123 struct netdev_bpf data = {}; <<
124 struct net_device *netdev; <<
125 <<
126 ASSERT_RTNL(); <<
127 <<
128 data.command = cmd; <<
129 data.offmap = offmap; <<
130 /* Caller must make sure netdev is val <<
131 netdev = offmap->netdev; <<
132 <<
133 return netdev->netdev_ops->ndo_bpf(net <<
134 } <<
135 <<
136 static void __bpf_map_offload_destroy(struct b <<
137 { <<
138 WARN_ON(bpf_map_offload_ndo(offmap, BP <<
139 /* Make sure BPF_MAP_GET_NEXT_ID can't <<
140 bpf_map_free_id(&offmap->map); <<
141 list_del_init(&offmap->offloads); <<
142 offmap->netdev = NULL; <<
143 } <<
144 <<
145 static void __bpf_offload_dev_netdev_unregiste <<
146 <<
147 { <<
148 struct bpf_offload_netdev *ondev, *alt <<
149 struct bpf_offloaded_map *offmap, *mtm <<
150 struct bpf_prog_offload *offload, *ptm <<
151 <<
152 ASSERT_RTNL(); <<
153 <<
154 ondev = rhashtable_lookup_fast(&offdev <<
155 if (WARN_ON(!ondev)) <<
156 return; <<
157 <<
158 WARN_ON(rhashtable_remove_fast(&offdev <<
159 <<
160 /* Try to move the objects to another <<
161 if (offdev) { <<
162 list_del(&ondev->offdev_netdev <<
163 altdev = list_first_entry_or_n <<
164 <<
165 <<
166 } <<
167 <<
168 if (altdev) { <<
169 list_for_each_entry(offload, & <<
170 offload->netdev = altd <<
171 list_splice_init(&ondev->progs <<
172 <<
173 list_for_each_entry(offmap, &o <<
174 offmap->netdev = altde <<
175 list_splice_init(&ondev->maps, <<
176 } else { <<
177 list_for_each_entry_safe(offlo <<
178 __bpf_prog_offload_des <<
179 list_for_each_entry_safe(offma <<
180 __bpf_map_offload_dest <<
181 } <<
182 <<
183 WARN_ON(!list_empty(&ondev->progs)); <<
184 WARN_ON(!list_empty(&ondev->maps)); <<
185 kfree(ondev); <<
186 } <<
187 89
188 static int __bpf_prog_dev_bound_init(struct bp !! 90 if (attr->prog_flags)
189 { !! 91 return -EINVAL;
190 struct bpf_offload_netdev *ondev; <<
191 struct bpf_prog_offload *offload; <<
192 int err; <<
193 92
194 offload = kzalloc(sizeof(*offload), GF 93 offload = kzalloc(sizeof(*offload), GFP_USER);
195 if (!offload) 94 if (!offload)
196 return -ENOMEM; 95 return -ENOMEM;
197 96
198 offload->prog = prog; 97 offload->prog = prog;
199 offload->netdev = netdev; <<
200 98
>> 99 offload->netdev = dev_get_by_index(current->nsproxy->net_ns,
>> 100 attr->prog_ifindex);
>> 101 err = bpf_dev_offload_check(offload->netdev);
>> 102 if (err)
>> 103 goto err_maybe_put;
>> 104
>> 105 down_write(&bpf_devs_lock);
201 ondev = bpf_offload_find_netdev(offloa 106 ondev = bpf_offload_find_netdev(offload->netdev);
202 /* When program is offloaded require p <<
203 * bpf_offload_netdev, avoid the one c <<
204 */ <<
205 if (bpf_prog_is_offloaded(prog->aux) & <<
206 err = -EINVAL; <<
207 goto err_free; <<
208 } <<
209 if (!ondev) { 107 if (!ondev) {
210 /* When only binding to the de !! 108 err = -EINVAL;
211 * create an entry in the hash !! 109 goto err_unlock;
212 */ <<
213 err = __bpf_offload_dev_netdev <<
214 if (err) <<
215 goto err_free; <<
216 ondev = bpf_offload_find_netde <<
217 } 110 }
218 offload->offdev = ondev->offdev; 111 offload->offdev = ondev->offdev;
219 prog->aux->offload = offload; 112 prog->aux->offload = offload;
220 list_add_tail(&offload->offloads, &ond 113 list_add_tail(&offload->offloads, &ondev->progs);
221 !! 114 dev_put(offload->netdev);
222 return 0; <<
223 err_free: <<
224 kfree(offload); <<
225 return err; <<
226 } <<
227 <<
228 int bpf_prog_dev_bound_init(struct bpf_prog *p <<
229 { <<
230 struct net_device *netdev; <<
231 int err; <<
232 <<
233 if (attr->prog_type != BPF_PROG_TYPE_S <<
234 attr->prog_type != BPF_PROG_TYPE_X <<
235 return -EINVAL; <<
236 <<
237 if (attr->prog_flags & ~(BPF_F_XDP_DEV <<
238 return -EINVAL; <<
239 <<
240 /* Frags are allowed only if program i <<
241 * if it is requesting bpf offload. <<
242 */ <<
243 if (attr->prog_flags & BPF_F_XDP_HAS_F <<
244 !(attr->prog_flags & BPF_F_XDP_DEV <<
245 return -EINVAL; <<
246 <<
247 if (attr->prog_type == BPF_PROG_TYPE_S <<
248 attr->prog_flags & BPF_F_XDP_DEV_B <<
249 return -EINVAL; <<
250 <<
251 netdev = dev_get_by_index(current->nsp <<
252 if (!netdev) <<
253 return -EINVAL; <<
254 <<
255 err = bpf_dev_offload_check(netdev); <<
256 if (err) <<
257 goto out; <<
258 <<
259 prog->aux->offload_requested = !(attr- <<
260 <<
261 down_write(&bpf_devs_lock); <<
262 err = __bpf_prog_dev_bound_init(prog, <<
263 up_write(&bpf_devs_lock); 115 up_write(&bpf_devs_lock);
264 116
265 out: !! 117 return 0;
266 dev_put(netdev); !! 118 err_unlock:
267 return err; <<
268 } <<
269 <<
270 int bpf_prog_dev_bound_inherit(struct bpf_prog <<
271 { <<
272 int err; <<
273 <<
274 if (!bpf_prog_is_dev_bound(old_prog->a <<
275 return 0; <<
276 <<
277 if (bpf_prog_is_offloaded(old_prog->au <<
278 return -EINVAL; <<
279 <<
280 new_prog->aux->dev_bound = old_prog->a <<
281 new_prog->aux->offload_requested = old <<
282 <<
283 down_write(&bpf_devs_lock); <<
284 if (!old_prog->aux->offload) { <<
285 err = -EINVAL; <<
286 goto out; <<
287 } <<
288 <<
289 err = __bpf_prog_dev_bound_init(new_pr <<
290 <<
291 out: <<
292 up_write(&bpf_devs_lock); 119 up_write(&bpf_devs_lock);
>> 120 err_maybe_put:
>> 121 if (offload->netdev)
>> 122 dev_put(offload->netdev);
>> 123 kfree(offload);
293 return err; 124 return err;
294 } 125 }
295 126
296 int bpf_prog_offload_verifier_prep(struct bpf_ 127 int bpf_prog_offload_verifier_prep(struct bpf_prog *prog)
297 { 128 {
298 struct bpf_prog_offload *offload; 129 struct bpf_prog_offload *offload;
299 int ret = -ENODEV; 130 int ret = -ENODEV;
300 131
301 down_read(&bpf_devs_lock); 132 down_read(&bpf_devs_lock);
302 offload = prog->aux->offload; 133 offload = prog->aux->offload;
303 if (offload) { 134 if (offload) {
304 ret = offload->offdev->ops->pr 135 ret = offload->offdev->ops->prepare(prog);
305 offload->dev_state = !ret; 136 offload->dev_state = !ret;
306 } 137 }
307 up_read(&bpf_devs_lock); 138 up_read(&bpf_devs_lock);
308 139
309 return ret; 140 return ret;
310 } 141 }
311 142
312 int bpf_prog_offload_verify_insn(struct bpf_ve 143 int bpf_prog_offload_verify_insn(struct bpf_verifier_env *env,
313 int insn_idx, 144 int insn_idx, int prev_insn_idx)
314 { 145 {
315 struct bpf_prog_offload *offload; 146 struct bpf_prog_offload *offload;
316 int ret = -ENODEV; 147 int ret = -ENODEV;
317 148
318 down_read(&bpf_devs_lock); 149 down_read(&bpf_devs_lock);
319 offload = env->prog->aux->offload; 150 offload = env->prog->aux->offload;
320 if (offload) 151 if (offload)
321 ret = offload->offdev->ops->in 152 ret = offload->offdev->ops->insn_hook(env, insn_idx,
322 153 prev_insn_idx);
323 up_read(&bpf_devs_lock); 154 up_read(&bpf_devs_lock);
324 155
325 return ret; 156 return ret;
326 } 157 }
327 158
328 int bpf_prog_offload_finalize(struct bpf_verif 159 int bpf_prog_offload_finalize(struct bpf_verifier_env *env)
329 { 160 {
330 struct bpf_prog_offload *offload; 161 struct bpf_prog_offload *offload;
331 int ret = -ENODEV; 162 int ret = -ENODEV;
332 163
333 down_read(&bpf_devs_lock); 164 down_read(&bpf_devs_lock);
334 offload = env->prog->aux->offload; 165 offload = env->prog->aux->offload;
335 if (offload) { 166 if (offload) {
336 if (offload->offdev->ops->fina 167 if (offload->offdev->ops->finalize)
337 ret = offload->offdev- 168 ret = offload->offdev->ops->finalize(env);
338 else 169 else
339 ret = 0; 170 ret = 0;
340 } 171 }
341 up_read(&bpf_devs_lock); 172 up_read(&bpf_devs_lock);
342 173
343 return ret; 174 return ret;
344 } 175 }
345 176
346 void 177 void
347 bpf_prog_offload_replace_insn(struct bpf_verif 178 bpf_prog_offload_replace_insn(struct bpf_verifier_env *env, u32 off,
348 struct bpf_insn 179 struct bpf_insn *insn)
349 { 180 {
350 const struct bpf_prog_offload_ops *ops 181 const struct bpf_prog_offload_ops *ops;
351 struct bpf_prog_offload *offload; 182 struct bpf_prog_offload *offload;
352 int ret = -EOPNOTSUPP; 183 int ret = -EOPNOTSUPP;
353 184
354 down_read(&bpf_devs_lock); 185 down_read(&bpf_devs_lock);
355 offload = env->prog->aux->offload; 186 offload = env->prog->aux->offload;
356 if (offload) { 187 if (offload) {
357 ops = offload->offdev->ops; 188 ops = offload->offdev->ops;
358 if (!offload->opt_failed && op 189 if (!offload->opt_failed && ops->replace_insn)
359 ret = ops->replace_ins 190 ret = ops->replace_insn(env, off, insn);
360 offload->opt_failed |= ret; 191 offload->opt_failed |= ret;
361 } 192 }
362 up_read(&bpf_devs_lock); 193 up_read(&bpf_devs_lock);
363 } 194 }
364 195
365 void 196 void
366 bpf_prog_offload_remove_insns(struct bpf_verif 197 bpf_prog_offload_remove_insns(struct bpf_verifier_env *env, u32 off, u32 cnt)
367 { 198 {
368 struct bpf_prog_offload *offload; 199 struct bpf_prog_offload *offload;
369 int ret = -EOPNOTSUPP; 200 int ret = -EOPNOTSUPP;
370 201
371 down_read(&bpf_devs_lock); 202 down_read(&bpf_devs_lock);
372 offload = env->prog->aux->offload; 203 offload = env->prog->aux->offload;
373 if (offload) { 204 if (offload) {
374 if (!offload->opt_failed && of 205 if (!offload->opt_failed && offload->offdev->ops->remove_insns)
375 ret = offload->offdev- 206 ret = offload->offdev->ops->remove_insns(env, off, cnt);
376 offload->opt_failed |= ret; 207 offload->opt_failed |= ret;
377 } 208 }
378 up_read(&bpf_devs_lock); 209 up_read(&bpf_devs_lock);
379 } 210 }
380 211
381 void bpf_prog_dev_bound_destroy(struct bpf_pro !! 212 static void __bpf_prog_offload_destroy(struct bpf_prog *prog)
382 { 213 {
383 struct bpf_offload_netdev *ondev; !! 214 struct bpf_prog_offload *offload = prog->aux->offload;
384 struct net_device *netdev; <<
385 215
386 rtnl_lock(); !! 216 if (offload->dev_state)
387 down_write(&bpf_devs_lock); !! 217 offload->offdev->ops->destroy(prog);
388 if (prog->aux->offload) { <<
389 list_del_init(&prog->aux->offl <<
390 218
391 netdev = prog->aux->offload->n !! 219 /* Make sure BPF_PROG_GET_NEXT_ID can't find this dead program */
392 __bpf_prog_offload_destroy(pro !! 220 bpf_prog_free_id(prog, true);
393 221
394 ondev = bpf_offload_find_netde !! 222 list_del_init(&offload->offloads);
395 if (!ondev->offdev && list_emp !! 223 kfree(offload);
396 __bpf_offload_dev_netd !! 224 prog->aux->offload = NULL;
397 } !! 225 }
>> 226
>> 227 void bpf_prog_offload_destroy(struct bpf_prog *prog)
>> 228 {
>> 229 down_write(&bpf_devs_lock);
>> 230 if (prog->aux->offload)
>> 231 __bpf_prog_offload_destroy(prog);
398 up_write(&bpf_devs_lock); 232 up_write(&bpf_devs_lock);
399 rtnl_unlock(); <<
400 } 233 }
401 234
402 static int bpf_prog_offload_translate(struct b 235 static int bpf_prog_offload_translate(struct bpf_prog *prog)
403 { 236 {
404 struct bpf_prog_offload *offload; 237 struct bpf_prog_offload *offload;
405 int ret = -ENODEV; 238 int ret = -ENODEV;
406 239
407 down_read(&bpf_devs_lock); 240 down_read(&bpf_devs_lock);
408 offload = prog->aux->offload; 241 offload = prog->aux->offload;
409 if (offload) 242 if (offload)
410 ret = offload->offdev->ops->tr 243 ret = offload->offdev->ops->translate(prog);
411 up_read(&bpf_devs_lock); 244 up_read(&bpf_devs_lock);
412 245
413 return ret; 246 return ret;
414 } 247 }
415 248
416 static unsigned int bpf_prog_warn_on_exec(cons 249 static unsigned int bpf_prog_warn_on_exec(const void *ctx,
417 cons 250 const struct bpf_insn *insn)
418 { 251 {
419 WARN(1, "attempt to execute device eBP 252 WARN(1, "attempt to execute device eBPF program on the host!");
420 return 0; 253 return 0;
421 } 254 }
422 255
423 int bpf_prog_offload_compile(struct bpf_prog * 256 int bpf_prog_offload_compile(struct bpf_prog *prog)
424 { 257 {
425 prog->bpf_func = bpf_prog_warn_on_exec 258 prog->bpf_func = bpf_prog_warn_on_exec;
426 259
427 return bpf_prog_offload_translate(prog 260 return bpf_prog_offload_translate(prog);
428 } 261 }
429 262
430 struct ns_get_path_bpf_prog_args { 263 struct ns_get_path_bpf_prog_args {
431 struct bpf_prog *prog; 264 struct bpf_prog *prog;
432 struct bpf_prog_info *info; 265 struct bpf_prog_info *info;
433 }; 266 };
434 267
435 static struct ns_common *bpf_prog_offload_info 268 static struct ns_common *bpf_prog_offload_info_fill_ns(void *private_data)
436 { 269 {
437 struct ns_get_path_bpf_prog_args *args 270 struct ns_get_path_bpf_prog_args *args = private_data;
438 struct bpf_prog_aux *aux = args->prog- 271 struct bpf_prog_aux *aux = args->prog->aux;
439 struct ns_common *ns; 272 struct ns_common *ns;
440 struct net *net; 273 struct net *net;
441 274
442 rtnl_lock(); 275 rtnl_lock();
443 down_read(&bpf_devs_lock); 276 down_read(&bpf_devs_lock);
444 277
445 if (aux->offload) { 278 if (aux->offload) {
446 args->info->ifindex = aux->off 279 args->info->ifindex = aux->offload->netdev->ifindex;
447 net = dev_net(aux->offload->ne 280 net = dev_net(aux->offload->netdev);
448 get_net(net); 281 get_net(net);
449 ns = &net->ns; 282 ns = &net->ns;
450 } else { 283 } else {
451 args->info->ifindex = 0; 284 args->info->ifindex = 0;
452 ns = NULL; 285 ns = NULL;
453 } 286 }
454 287
455 up_read(&bpf_devs_lock); 288 up_read(&bpf_devs_lock);
456 rtnl_unlock(); 289 rtnl_unlock();
457 290
458 return ns; 291 return ns;
459 } 292 }
460 293
461 int bpf_prog_offload_info_fill(struct bpf_prog 294 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
462 struct bpf_prog 295 struct bpf_prog *prog)
463 { 296 {
464 struct ns_get_path_bpf_prog_args args 297 struct ns_get_path_bpf_prog_args args = {
465 .prog = prog, 298 .prog = prog,
466 .info = info, 299 .info = info,
467 }; 300 };
468 struct bpf_prog_aux *aux = prog->aux; 301 struct bpf_prog_aux *aux = prog->aux;
469 struct inode *ns_inode; 302 struct inode *ns_inode;
470 struct path ns_path; 303 struct path ns_path;
471 char __user *uinsns; 304 char __user *uinsns;
472 int res; 305 int res;
473 u32 ulen; 306 u32 ulen;
474 307
475 res = ns_get_path_cb(&ns_path, bpf_pro 308 res = ns_get_path_cb(&ns_path, bpf_prog_offload_info_fill_ns, &args);
476 if (res) { 309 if (res) {
477 if (!info->ifindex) 310 if (!info->ifindex)
478 return -ENODEV; 311 return -ENODEV;
479 return res; 312 return res;
480 } 313 }
481 314
482 down_read(&bpf_devs_lock); 315 down_read(&bpf_devs_lock);
483 316
484 if (!aux->offload) { 317 if (!aux->offload) {
485 up_read(&bpf_devs_lock); 318 up_read(&bpf_devs_lock);
486 return -ENODEV; 319 return -ENODEV;
487 } 320 }
488 321
489 ulen = info->jited_prog_len; 322 ulen = info->jited_prog_len;
490 info->jited_prog_len = aux->offload->j 323 info->jited_prog_len = aux->offload->jited_len;
491 if (info->jited_prog_len && ulen) { 324 if (info->jited_prog_len && ulen) {
492 uinsns = u64_to_user_ptr(info- 325 uinsns = u64_to_user_ptr(info->jited_prog_insns);
493 ulen = min_t(u32, info->jited_ 326 ulen = min_t(u32, info->jited_prog_len, ulen);
494 if (copy_to_user(uinsns, aux-> 327 if (copy_to_user(uinsns, aux->offload->jited_image, ulen)) {
495 up_read(&bpf_devs_lock 328 up_read(&bpf_devs_lock);
496 return -EFAULT; 329 return -EFAULT;
497 } 330 }
498 } 331 }
499 332
500 up_read(&bpf_devs_lock); 333 up_read(&bpf_devs_lock);
501 334
502 ns_inode = ns_path.dentry->d_inode; 335 ns_inode = ns_path.dentry->d_inode;
503 info->netns_dev = new_encode_dev(ns_in 336 info->netns_dev = new_encode_dev(ns_inode->i_sb->s_dev);
504 info->netns_ino = ns_inode->i_ino; 337 info->netns_ino = ns_inode->i_ino;
505 path_put(&ns_path); 338 path_put(&ns_path);
506 339
507 return 0; 340 return 0;
508 } 341 }
509 342
510 const struct bpf_prog_ops bpf_offload_prog_ops 343 const struct bpf_prog_ops bpf_offload_prog_ops = {
511 }; 344 };
512 345
>> 346 static int bpf_map_offload_ndo(struct bpf_offloaded_map *offmap,
>> 347 enum bpf_netdev_command cmd)
>> 348 {
>> 349 struct netdev_bpf data = {};
>> 350 struct net_device *netdev;
>> 351
>> 352 ASSERT_RTNL();
>> 353
>> 354 data.command = cmd;
>> 355 data.offmap = offmap;
>> 356 /* Caller must make sure netdev is valid */
>> 357 netdev = offmap->netdev;
>> 358
>> 359 return netdev->netdev_ops->ndo_bpf(netdev, &data);
>> 360 }
>> 361
513 struct bpf_map *bpf_map_offload_map_alloc(unio 362 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
514 { 363 {
515 struct net *net = current->nsproxy->ne 364 struct net *net = current->nsproxy->net_ns;
516 struct bpf_offload_netdev *ondev; 365 struct bpf_offload_netdev *ondev;
517 struct bpf_offloaded_map *offmap; 366 struct bpf_offloaded_map *offmap;
518 int err; 367 int err;
519 368
520 if (!capable(CAP_SYS_ADMIN)) 369 if (!capable(CAP_SYS_ADMIN))
521 return ERR_PTR(-EPERM); 370 return ERR_PTR(-EPERM);
522 if (attr->map_type != BPF_MAP_TYPE_ARR 371 if (attr->map_type != BPF_MAP_TYPE_ARRAY &&
523 attr->map_type != BPF_MAP_TYPE_HAS 372 attr->map_type != BPF_MAP_TYPE_HASH)
524 return ERR_PTR(-EINVAL); 373 return ERR_PTR(-EINVAL);
525 374
526 offmap = bpf_map_area_alloc(sizeof(*of !! 375 offmap = kzalloc(sizeof(*offmap), GFP_USER);
527 if (!offmap) 376 if (!offmap)
528 return ERR_PTR(-ENOMEM); 377 return ERR_PTR(-ENOMEM);
529 378
530 bpf_map_init_from_attr(&offmap->map, a 379 bpf_map_init_from_attr(&offmap->map, attr);
531 380
532 rtnl_lock(); 381 rtnl_lock();
533 down_write(&bpf_devs_lock); 382 down_write(&bpf_devs_lock);
534 offmap->netdev = __dev_get_by_index(ne 383 offmap->netdev = __dev_get_by_index(net, attr->map_ifindex);
535 err = bpf_dev_offload_check(offmap->ne 384 err = bpf_dev_offload_check(offmap->netdev);
536 if (err) 385 if (err)
537 goto err_unlock; 386 goto err_unlock;
538 387
539 ondev = bpf_offload_find_netdev(offmap 388 ondev = bpf_offload_find_netdev(offmap->netdev);
540 if (!ondev) { 389 if (!ondev) {
541 err = -EINVAL; 390 err = -EINVAL;
542 goto err_unlock; 391 goto err_unlock;
543 } 392 }
544 393
545 err = bpf_map_offload_ndo(offmap, BPF_ 394 err = bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_ALLOC);
546 if (err) 395 if (err)
547 goto err_unlock; 396 goto err_unlock;
548 397
549 list_add_tail(&offmap->offloads, &onde 398 list_add_tail(&offmap->offloads, &ondev->maps);
550 up_write(&bpf_devs_lock); 399 up_write(&bpf_devs_lock);
551 rtnl_unlock(); 400 rtnl_unlock();
552 401
553 return &offmap->map; 402 return &offmap->map;
554 403
555 err_unlock: 404 err_unlock:
556 up_write(&bpf_devs_lock); 405 up_write(&bpf_devs_lock);
557 rtnl_unlock(); 406 rtnl_unlock();
558 bpf_map_area_free(offmap); !! 407 kfree(offmap);
559 return ERR_PTR(err); 408 return ERR_PTR(err);
560 } 409 }
561 410
>> 411 static void __bpf_map_offload_destroy(struct bpf_offloaded_map *offmap)
>> 412 {
>> 413 WARN_ON(bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_FREE));
>> 414 /* Make sure BPF_MAP_GET_NEXT_ID can't find this dead map */
>> 415 bpf_map_free_id(&offmap->map, true);
>> 416 list_del_init(&offmap->offloads);
>> 417 offmap->netdev = NULL;
>> 418 }
>> 419
562 void bpf_map_offload_map_free(struct bpf_map * 420 void bpf_map_offload_map_free(struct bpf_map *map)
563 { 421 {
564 struct bpf_offloaded_map *offmap = map 422 struct bpf_offloaded_map *offmap = map_to_offmap(map);
565 423
566 rtnl_lock(); 424 rtnl_lock();
567 down_write(&bpf_devs_lock); 425 down_write(&bpf_devs_lock);
568 if (offmap->netdev) 426 if (offmap->netdev)
569 __bpf_map_offload_destroy(offm 427 __bpf_map_offload_destroy(offmap);
570 up_write(&bpf_devs_lock); 428 up_write(&bpf_devs_lock);
571 rtnl_unlock(); 429 rtnl_unlock();
572 430
573 bpf_map_area_free(offmap); !! 431 kfree(offmap);
574 } <<
575 <<
576 u64 bpf_map_offload_map_mem_usage(const struct <<
577 { <<
578 /* The memory dynamically allocated in <<
579 return sizeof(struct bpf_offloaded_map <<
580 } 432 }
581 433
582 int bpf_map_offload_lookup_elem(struct bpf_map 434 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value)
583 { 435 {
584 struct bpf_offloaded_map *offmap = map 436 struct bpf_offloaded_map *offmap = map_to_offmap(map);
585 int ret = -ENODEV; 437 int ret = -ENODEV;
586 438
587 down_read(&bpf_devs_lock); 439 down_read(&bpf_devs_lock);
588 if (offmap->netdev) 440 if (offmap->netdev)
589 ret = offmap->dev_ops->map_loo 441 ret = offmap->dev_ops->map_lookup_elem(offmap, key, value);
590 up_read(&bpf_devs_lock); 442 up_read(&bpf_devs_lock);
591 443
592 return ret; 444 return ret;
593 } 445 }
594 446
595 int bpf_map_offload_update_elem(struct bpf_map 447 int bpf_map_offload_update_elem(struct bpf_map *map,
596 void *key, voi 448 void *key, void *value, u64 flags)
597 { 449 {
598 struct bpf_offloaded_map *offmap = map 450 struct bpf_offloaded_map *offmap = map_to_offmap(map);
599 int ret = -ENODEV; 451 int ret = -ENODEV;
600 452
601 if (unlikely(flags > BPF_EXIST)) 453 if (unlikely(flags > BPF_EXIST))
602 return -EINVAL; 454 return -EINVAL;
603 455
604 down_read(&bpf_devs_lock); 456 down_read(&bpf_devs_lock);
605 if (offmap->netdev) 457 if (offmap->netdev)
606 ret = offmap->dev_ops->map_upd 458 ret = offmap->dev_ops->map_update_elem(offmap, key, value,
607 459 flags);
608 up_read(&bpf_devs_lock); 460 up_read(&bpf_devs_lock);
609 461
610 return ret; 462 return ret;
611 } 463 }
612 464
613 int bpf_map_offload_delete_elem(struct bpf_map 465 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key)
614 { 466 {
615 struct bpf_offloaded_map *offmap = map 467 struct bpf_offloaded_map *offmap = map_to_offmap(map);
616 int ret = -ENODEV; 468 int ret = -ENODEV;
617 469
618 down_read(&bpf_devs_lock); 470 down_read(&bpf_devs_lock);
619 if (offmap->netdev) 471 if (offmap->netdev)
620 ret = offmap->dev_ops->map_del 472 ret = offmap->dev_ops->map_delete_elem(offmap, key);
621 up_read(&bpf_devs_lock); 473 up_read(&bpf_devs_lock);
622 474
623 return ret; 475 return ret;
624 } 476 }
625 477
626 int bpf_map_offload_get_next_key(struct bpf_ma 478 int bpf_map_offload_get_next_key(struct bpf_map *map, void *key, void *next_key)
627 { 479 {
628 struct bpf_offloaded_map *offmap = map 480 struct bpf_offloaded_map *offmap = map_to_offmap(map);
629 int ret = -ENODEV; 481 int ret = -ENODEV;
630 482
631 down_read(&bpf_devs_lock); 483 down_read(&bpf_devs_lock);
632 if (offmap->netdev) 484 if (offmap->netdev)
633 ret = offmap->dev_ops->map_get 485 ret = offmap->dev_ops->map_get_next_key(offmap, key, next_key);
634 up_read(&bpf_devs_lock); 486 up_read(&bpf_devs_lock);
635 487
636 return ret; 488 return ret;
637 } 489 }
638 490
639 struct ns_get_path_bpf_map_args { 491 struct ns_get_path_bpf_map_args {
640 struct bpf_offloaded_map *offmap; 492 struct bpf_offloaded_map *offmap;
641 struct bpf_map_info *info; 493 struct bpf_map_info *info;
642 }; 494 };
643 495
644 static struct ns_common *bpf_map_offload_info_ 496 static struct ns_common *bpf_map_offload_info_fill_ns(void *private_data)
645 { 497 {
646 struct ns_get_path_bpf_map_args *args 498 struct ns_get_path_bpf_map_args *args = private_data;
647 struct ns_common *ns; 499 struct ns_common *ns;
648 struct net *net; 500 struct net *net;
649 501
650 rtnl_lock(); 502 rtnl_lock();
651 down_read(&bpf_devs_lock); 503 down_read(&bpf_devs_lock);
652 504
653 if (args->offmap->netdev) { 505 if (args->offmap->netdev) {
654 args->info->ifindex = args->of 506 args->info->ifindex = args->offmap->netdev->ifindex;
655 net = dev_net(args->offmap->ne 507 net = dev_net(args->offmap->netdev);
656 get_net(net); 508 get_net(net);
657 ns = &net->ns; 509 ns = &net->ns;
658 } else { 510 } else {
659 args->info->ifindex = 0; 511 args->info->ifindex = 0;
660 ns = NULL; 512 ns = NULL;
661 } 513 }
662 514
663 up_read(&bpf_devs_lock); 515 up_read(&bpf_devs_lock);
664 rtnl_unlock(); 516 rtnl_unlock();
665 517
666 return ns; 518 return ns;
667 } 519 }
668 520
669 int bpf_map_offload_info_fill(struct bpf_map_i 521 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map)
670 { 522 {
671 struct ns_get_path_bpf_map_args args = 523 struct ns_get_path_bpf_map_args args = {
672 .offmap = map_to_offmap(map), 524 .offmap = map_to_offmap(map),
673 .info = info, 525 .info = info,
674 }; 526 };
675 struct inode *ns_inode; 527 struct inode *ns_inode;
676 struct path ns_path; 528 struct path ns_path;
677 int res; 529 int res;
678 530
679 res = ns_get_path_cb(&ns_path, bpf_map 531 res = ns_get_path_cb(&ns_path, bpf_map_offload_info_fill_ns, &args);
680 if (res) { 532 if (res) {
681 if (!info->ifindex) 533 if (!info->ifindex)
682 return -ENODEV; 534 return -ENODEV;
683 return res; 535 return res;
684 } 536 }
685 537
686 ns_inode = ns_path.dentry->d_inode; 538 ns_inode = ns_path.dentry->d_inode;
687 info->netns_dev = new_encode_dev(ns_in 539 info->netns_dev = new_encode_dev(ns_inode->i_sb->s_dev);
688 info->netns_ino = ns_inode->i_ino; 540 info->netns_ino = ns_inode->i_ino;
689 path_put(&ns_path); 541 path_put(&ns_path);
690 542
691 return 0; 543 return 0;
692 } 544 }
693 545
694 static bool __bpf_offload_dev_match(struct bpf 546 static bool __bpf_offload_dev_match(struct bpf_prog *prog,
695 struct net 547 struct net_device *netdev)
696 { 548 {
697 struct bpf_offload_netdev *ondev1, *on 549 struct bpf_offload_netdev *ondev1, *ondev2;
698 struct bpf_prog_offload *offload; 550 struct bpf_prog_offload *offload;
699 551
700 if (!bpf_prog_is_dev_bound(prog->aux)) 552 if (!bpf_prog_is_dev_bound(prog->aux))
701 return false; 553 return false;
702 554
703 offload = prog->aux->offload; 555 offload = prog->aux->offload;
704 if (!offload) 556 if (!offload)
705 return false; 557 return false;
706 if (offload->netdev == netdev) 558 if (offload->netdev == netdev)
707 return true; 559 return true;
708 560
709 ondev1 = bpf_offload_find_netdev(offlo 561 ondev1 = bpf_offload_find_netdev(offload->netdev);
710 ondev2 = bpf_offload_find_netdev(netde 562 ondev2 = bpf_offload_find_netdev(netdev);
711 563
712 return ondev1 && ondev2 && ondev1->off 564 return ondev1 && ondev2 && ondev1->offdev == ondev2->offdev;
713 } 565 }
714 566
715 bool bpf_offload_dev_match(struct bpf_prog *pr 567 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev)
716 { 568 {
717 bool ret; 569 bool ret;
718 570
719 down_read(&bpf_devs_lock); 571 down_read(&bpf_devs_lock);
720 ret = __bpf_offload_dev_match(prog, ne 572 ret = __bpf_offload_dev_match(prog, netdev);
721 up_read(&bpf_devs_lock); 573 up_read(&bpf_devs_lock);
722 574
723 return ret; 575 return ret;
724 } 576 }
725 EXPORT_SYMBOL_GPL(bpf_offload_dev_match); 577 EXPORT_SYMBOL_GPL(bpf_offload_dev_match);
726 578
727 bool bpf_prog_dev_bound_match(const struct bpf <<
728 { <<
729 bool ret; <<
730 <<
731 if (bpf_prog_is_offloaded(lhs->aux) != <<
732 return false; <<
733 <<
734 down_read(&bpf_devs_lock); <<
735 ret = lhs->aux->offload && rhs->aux->o <<
736 lhs->aux->offload->netdev && <<
737 lhs->aux->offload->netdev == rhs <<
738 up_read(&bpf_devs_lock); <<
739 <<
740 return ret; <<
741 } <<
742 <<
743 bool bpf_offload_prog_map_match(struct bpf_pro 579 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map)
744 { 580 {
745 struct bpf_offloaded_map *offmap; 581 struct bpf_offloaded_map *offmap;
746 bool ret; 582 bool ret;
747 583
748 if (!bpf_map_is_offloaded(map)) !! 584 if (!bpf_map_is_dev_bound(map))
749 return bpf_map_offload_neutral 585 return bpf_map_offload_neutral(map);
750 offmap = map_to_offmap(map); 586 offmap = map_to_offmap(map);
751 587
752 down_read(&bpf_devs_lock); 588 down_read(&bpf_devs_lock);
753 ret = __bpf_offload_dev_match(prog, of 589 ret = __bpf_offload_dev_match(prog, offmap->netdev);
754 up_read(&bpf_devs_lock); 590 up_read(&bpf_devs_lock);
755 591
756 return ret; 592 return ret;
757 } 593 }
758 594
759 int bpf_offload_dev_netdev_register(struct bpf 595 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
760 struct net 596 struct net_device *netdev)
761 { 597 {
>> 598 struct bpf_offload_netdev *ondev;
762 int err; 599 int err;
763 600
>> 601 ondev = kzalloc(sizeof(*ondev), GFP_KERNEL);
>> 602 if (!ondev)
>> 603 return -ENOMEM;
>> 604
>> 605 ondev->netdev = netdev;
>> 606 ondev->offdev = offdev;
>> 607 INIT_LIST_HEAD(&ondev->progs);
>> 608 INIT_LIST_HEAD(&ondev->maps);
>> 609
764 down_write(&bpf_devs_lock); 610 down_write(&bpf_devs_lock);
765 err = __bpf_offload_dev_netdev_registe !! 611 err = rhashtable_insert_fast(&offdevs, &ondev->l, offdevs_params);
>> 612 if (err) {
>> 613 netdev_warn(netdev, "failed to register for BPF offload\n");
>> 614 goto err_unlock_free;
>> 615 }
>> 616
>> 617 list_add(&ondev->offdev_netdevs, &offdev->netdevs);
766 up_write(&bpf_devs_lock); 618 up_write(&bpf_devs_lock);
>> 619 return 0;
>> 620
>> 621 err_unlock_free:
>> 622 up_write(&bpf_devs_lock);
>> 623 kfree(ondev);
767 return err; 624 return err;
768 } 625 }
769 EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_regis 626 EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_register);
770 627
771 void bpf_offload_dev_netdev_unregister(struct 628 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
772 struct 629 struct net_device *netdev)
773 { 630 {
>> 631 struct bpf_offload_netdev *ondev, *altdev;
>> 632 struct bpf_offloaded_map *offmap, *mtmp;
>> 633 struct bpf_prog_offload *offload, *ptmp;
>> 634
>> 635 ASSERT_RTNL();
>> 636
774 down_write(&bpf_devs_lock); 637 down_write(&bpf_devs_lock);
775 __bpf_offload_dev_netdev_unregister(of !! 638 ondev = rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params);
>> 639 if (WARN_ON(!ondev))
>> 640 goto unlock;
>> 641
>> 642 WARN_ON(rhashtable_remove_fast(&offdevs, &ondev->l, offdevs_params));
>> 643 list_del(&ondev->offdev_netdevs);
>> 644
>> 645 /* Try to move the objects to another netdev of the device */
>> 646 altdev = list_first_entry_or_null(&offdev->netdevs,
>> 647 struct bpf_offload_netdev,
>> 648 offdev_netdevs);
>> 649 if (altdev) {
>> 650 list_for_each_entry(offload, &ondev->progs, offloads)
>> 651 offload->netdev = altdev->netdev;
>> 652 list_splice_init(&ondev->progs, &altdev->progs);
>> 653
>> 654 list_for_each_entry(offmap, &ondev->maps, offloads)
>> 655 offmap->netdev = altdev->netdev;
>> 656 list_splice_init(&ondev->maps, &altdev->maps);
>> 657 } else {
>> 658 list_for_each_entry_safe(offload, ptmp, &ondev->progs, offloads)
>> 659 __bpf_prog_offload_destroy(offload->prog);
>> 660 list_for_each_entry_safe(offmap, mtmp, &ondev->maps, offloads)
>> 661 __bpf_map_offload_destroy(offmap);
>> 662 }
>> 663
>> 664 WARN_ON(!list_empty(&ondev->progs));
>> 665 WARN_ON(!list_empty(&ondev->maps));
>> 666 kfree(ondev);
>> 667 unlock:
776 up_write(&bpf_devs_lock); 668 up_write(&bpf_devs_lock);
777 } 669 }
778 EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_unreg 670 EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_unregister);
779 671
780 struct bpf_offload_dev * 672 struct bpf_offload_dev *
781 bpf_offload_dev_create(const struct bpf_prog_o 673 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv)
782 { 674 {
783 struct bpf_offload_dev *offdev; 675 struct bpf_offload_dev *offdev;
>> 676 int err;
>> 677
>> 678 down_write(&bpf_devs_lock);
>> 679 if (!offdevs_inited) {
>> 680 err = rhashtable_init(&offdevs, &offdevs_params);
>> 681 if (err) {
>> 682 up_write(&bpf_devs_lock);
>> 683 return ERR_PTR(err);
>> 684 }
>> 685 offdevs_inited = true;
>> 686 }
>> 687 up_write(&bpf_devs_lock);
784 688
785 offdev = kzalloc(sizeof(*offdev), GFP_ 689 offdev = kzalloc(sizeof(*offdev), GFP_KERNEL);
786 if (!offdev) 690 if (!offdev)
787 return ERR_PTR(-ENOMEM); 691 return ERR_PTR(-ENOMEM);
788 692
789 offdev->ops = ops; 693 offdev->ops = ops;
790 offdev->priv = priv; 694 offdev->priv = priv;
791 INIT_LIST_HEAD(&offdev->netdevs); 695 INIT_LIST_HEAD(&offdev->netdevs);
792 696
793 return offdev; 697 return offdev;
794 } 698 }
795 EXPORT_SYMBOL_GPL(bpf_offload_dev_create); 699 EXPORT_SYMBOL_GPL(bpf_offload_dev_create);
796 700
797 void bpf_offload_dev_destroy(struct bpf_offloa 701 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev)
798 { 702 {
799 WARN_ON(!list_empty(&offdev->netdevs)) 703 WARN_ON(!list_empty(&offdev->netdevs));
800 kfree(offdev); 704 kfree(offdev);
801 } 705 }
802 EXPORT_SYMBOL_GPL(bpf_offload_dev_destroy); 706 EXPORT_SYMBOL_GPL(bpf_offload_dev_destroy);
803 707
804 void *bpf_offload_dev_priv(struct bpf_offload_ 708 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev)
805 { 709 {
806 return offdev->priv; 710 return offdev->priv;
807 } 711 }
808 EXPORT_SYMBOL_GPL(bpf_offload_dev_priv); 712 EXPORT_SYMBOL_GPL(bpf_offload_dev_priv);
809 <<
810 void bpf_dev_bound_netdev_unregister(struct ne <<
811 { <<
812 struct bpf_offload_netdev *ondev; <<
813 <<
814 ASSERT_RTNL(); <<
815 <<
816 down_write(&bpf_devs_lock); <<
817 ondev = bpf_offload_find_netdev(dev); <<
818 if (ondev && !ondev->offdev) <<
819 __bpf_offload_dev_netdev_unreg <<
820 up_write(&bpf_devs_lock); <<
821 } <<
822 <<
823 int bpf_dev_bound_kfunc_check(struct bpf_verif <<
824 struct bpf_prog_ <<
825 { <<
826 if (!bpf_prog_is_dev_bound(prog_aux)) <<
827 bpf_log(log, "metadata kfuncs <<
828 return -EINVAL; <<
829 } <<
830 <<
831 if (bpf_prog_is_offloaded(prog_aux)) { <<
832 bpf_log(log, "metadata kfuncs <<
833 return -EINVAL; <<
834 } <<
835 <<
836 return 0; <<
837 } <<
838 <<
839 void *bpf_dev_bound_resolve_kfunc(struct bpf_p <<
840 { <<
841 const struct xdp_metadata_ops *ops; <<
842 void *p = NULL; <<
843 <<
844 /* We don't hold bpf_devs_lock while r <<
845 * kfuncs and can race with the unregi <<
846 * We rely on bpf_dev_bound_match() ch <<
847 * to render this program unusable. <<
848 */ <<
849 down_read(&bpf_devs_lock); <<
850 if (!prog->aux->offload) <<
851 goto out; <<
852 <<
853 ops = prog->aux->offload->netdev->xdp_ <<
854 if (!ops) <<
855 goto out; <<
856 <<
857 #define XDP_METADATA_KFUNC(name, _, __, xmo) \ <<
858 if (func_id == bpf_xdp_metadata_kfunc_ <<
859 XDP_METADATA_KFUNC_xxx <<
860 #undef XDP_METADATA_KFUNC <<
861 <<
862 out: <<
863 up_read(&bpf_devs_lock); <<
864 <<
865 return p; <<
866 } <<
867 <<
868 static int __init bpf_offload_init(void) <<
869 { <<
870 return rhashtable_init(&offdevs, &offd <<
871 } <<
872 <<
873 core_initcall(bpf_offload_init); <<
874 713
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