1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
|
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/xdp.h>
#include <net/xdp_sock.h>
#include <net/netdev_rx_queue.h>
#include <net/busy_poll.h>
#include "netdev-genl-gen.h"
#include "dev.h"
struct netdev_nl_dump_ctx {
unsigned long ifindex;
unsigned int rxq_idx;
unsigned int txq_idx;
unsigned int napi_id;
};
static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb)
{
NL_ASSERT_DUMP_CTX_FITS(struct netdev_nl_dump_ctx);
return (struct netdev_nl_dump_ctx *)cb->ctx;
}
static int
netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info)
{
u64 xsk_features = 0;
u64 xdp_rx_meta = 0;
void *hdr;
hdr = genlmsg_iput(rsp, info);
if (!hdr)
return -EMSGSIZE;
#define XDP_METADATA_KFUNC(_, flag, __, xmo) \
if (netdev->xdp_metadata_ops && netdev->xdp_metadata_ops->xmo) \
xdp_rx_meta |= flag;
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
if (netdev->xsk_tx_metadata_ops) {
if (netdev->xsk_tx_metadata_ops->tmo_fill_timestamp)
xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP;
if (netdev->xsk_tx_metadata_ops->tmo_request_checksum)
xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM;
}
if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES,
netdev->xdp_features, NETDEV_A_DEV_PAD) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
xdp_rx_meta, NETDEV_A_DEV_PAD) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XSK_FEATURES,
xsk_features, NETDEV_A_DEV_PAD)) {
genlmsg_cancel(rsp, hdr);
return -EINVAL;
}
if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) {
if (nla_put_u32(rsp, NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
netdev->xdp_zc_max_segs)) {
genlmsg_cancel(rsp, hdr);
return -EINVAL;
}
}
genlmsg_end(rsp, hdr);
return 0;
}
static void
netdev_genl_dev_notify(struct net_device *netdev, int cmd)
{
struct genl_info info;
struct sk_buff *ntf;
if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev),
NETDEV_NLGRP_MGMT))
return;
genl_info_init_ntf(&info, &netdev_nl_family, cmd);
ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!ntf)
return;
if (netdev_nl_dev_fill(netdev, ntf, &info)) {
nlmsg_free(ntf);
return;
}
genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf,
0, NETDEV_NLGRP_MGMT, GFP_KERNEL);
}
int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *netdev;
struct sk_buff *rsp;
u32 ifindex;
int err;
if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX))
return -EINVAL;
ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]);
rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!rsp)
return -ENOMEM;
rtnl_lock();
netdev = __dev_get_by_index(genl_info_net(info), ifindex);
if (netdev)
err = netdev_nl_dev_fill(netdev, rsp, info);
else
err = -ENODEV;
rtnl_unlock();
if (err)
goto err_free_msg;
return genlmsg_reply(rsp, info);
err_free_msg:
nlmsg_free(rsp);
return err;
}
int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
struct net *net = sock_net(skb->sk);
struct net_device *netdev;
int err = 0;
rtnl_lock();
for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
if (err < 0)
break;
}
rtnl_unlock();
return err;
}
static int
netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
const struct genl_info *info)
{
void *hdr;
pid_t pid;
if (WARN_ON_ONCE(!napi->dev))
return -EINVAL;
if (!(napi->dev->flags & IFF_UP))
return 0;
hdr = genlmsg_iput(rsp, info);
if (!hdr)
return -EMSGSIZE;
if (napi->napi_id >= MIN_NAPI_ID &&
nla_put_u32(rsp, NETDEV_A_NAPI_ID, napi->napi_id))
goto nla_put_failure;
if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex))
goto nla_put_failure;
if (napi->irq >= 0 && nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq))
goto nla_put_failure;
if (napi->thread) {
pid = task_pid_nr(napi->thread);
if (nla_put_u32(rsp, NETDEV_A_NAPI_PID, pid))
goto nla_put_failure;
}
genlmsg_end(rsp, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(rsp, hdr);
return -EMSGSIZE;
}
int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
{
struct napi_struct *napi;
struct sk_buff *rsp;
u32 napi_id;
int err;
if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID))
return -EINVAL;
napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]);
rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!rsp)
return -ENOMEM;
rtnl_lock();
napi = napi_by_id(napi_id);
if (napi)
err = netdev_nl_napi_fill_one(rsp, napi, info);
else
err = -EINVAL;
rtnl_unlock();
if (err)
goto err_free_msg;
return genlmsg_reply(rsp, info);
err_free_msg:
nlmsg_free(rsp);
return err;
}
static int
netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info,
struct netdev_nl_dump_ctx *ctx)
{
struct napi_struct *napi;
int err = 0;
if (!(netdev->flags & IFF_UP))
return err;
list_for_each_entry(napi, &netdev->napi_list, dev_list) {
if (ctx->napi_id && napi->napi_id >= ctx->napi_id)
continue;
err = netdev_nl_napi_fill_one(rsp, napi, info);
if (err)
return err;
ctx->napi_id = napi->napi_id;
}
return err;
}
int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
const struct genl_info *info = genl_info_dump(cb);
struct net *net = sock_net(skb->sk);
struct net_device *netdev;
u32 ifindex = 0;
int err = 0;
if (info->attrs[NETDEV_A_NAPI_IFINDEX])
ifindex = nla_get_u32(info->attrs[NETDEV_A_NAPI_IFINDEX]);
rtnl_lock();
if (ifindex) {
netdev = __dev_get_by_index(net, ifindex);
if (netdev)
err = netdev_nl_napi_dump_one(netdev, skb, info, ctx);
else
err = -ENODEV;
} else {
for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_napi_dump_one(netdev, skb, info, ctx);
if (err < 0)
break;
ctx->napi_id = 0;
}
}
rtnl_unlock();
return err;
}
static int
netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
u32 q_idx, u32 q_type, const struct genl_info *info)
{
struct netdev_rx_queue *rxq;
struct netdev_queue *txq;
void *hdr;
hdr = genlmsg_iput(rsp, info);
if (!hdr)
return -EMSGSIZE;
if (nla_put_u32(rsp, NETDEV_A_QUEUE_ID, q_idx) ||
nla_put_u32(rsp, NETDEV_A_QUEUE_TYPE, q_type) ||
nla_put_u32(rsp, NETDEV_A_QUEUE_IFINDEX, netdev->ifindex))
goto nla_put_failure;
switch (q_type) {
case NETDEV_QUEUE_TYPE_RX:
rxq = __netif_get_rx_queue(netdev, q_idx);
if (rxq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
rxq->napi->napi_id))
goto nla_put_failure;
break;
case NETDEV_QUEUE_TYPE_TX:
txq = netdev_get_tx_queue(netdev, q_idx);
if (txq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
txq->napi->napi_id))
goto nla_put_failure;
}
genlmsg_end(rsp, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(rsp, hdr);
return -EMSGSIZE;
}
static int netdev_nl_queue_validate(struct net_device *netdev, u32 q_id,
u32 q_type)
{
switch (q_type) {
case NETDEV_QUEUE_TYPE_RX:
if (q_id >= netdev->real_num_rx_queues)
return -EINVAL;
return 0;
case NETDEV_QUEUE_TYPE_TX:
if (q_id >= netdev->real_num_tx_queues)
return -EINVAL;
}
return 0;
}
static int
netdev_nl_queue_fill(struct sk_buff *rsp, struct net_device *netdev, u32 q_idx,
u32 q_type, const struct genl_info *info)
{
int err = 0;
if (!(netdev->flags & IFF_UP))
return err;
err = netdev_nl_queue_validate(netdev, q_idx, q_type);
if (err)
return err;
return netdev_nl_queue_fill_one(rsp, netdev, q_idx, q_type, info);
}
int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info)
{
u32 q_id, q_type, ifindex;
struct net_device *netdev;
struct sk_buff *rsp;
int err;
if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_ID) ||
GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_TYPE) ||
GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFINDEX))
return -EINVAL;
q_id = nla_get_u32(info->attrs[NETDEV_A_QUEUE_ID]);
q_type = nla_get_u32(info->attrs[NETDEV_A_QUEUE_TYPE]);
ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!rsp)
return -ENOMEM;
rtnl_lock();
netdev = __dev_get_by_index(genl_info_net(info), ifindex);
if (netdev)
err = netdev_nl_queue_fill(rsp, netdev, q_id, q_type, info);
else
err = -ENODEV;
rtnl_unlock();
if (err)
goto err_free_msg;
return genlmsg_reply(rsp, info);
err_free_msg:
nlmsg_free(rsp);
return err;
}
static int
netdev_nl_queue_dump_one(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info,
struct netdev_nl_dump_ctx *ctx)
{
int err = 0;
int i;
if (!(netdev->flags & IFF_UP))
return err;
for (i = ctx->rxq_idx; i < netdev->real_num_rx_queues;) {
err = netdev_nl_queue_fill_one(rsp, netdev, i,
NETDEV_QUEUE_TYPE_RX, info);
if (err)
return err;
ctx->rxq_idx = i++;
}
for (i = ctx->txq_idx; i < netdev->real_num_tx_queues;) {
err = netdev_nl_queue_fill_one(rsp, netdev, i,
NETDEV_QUEUE_TYPE_TX, info);
if (err)
return err;
ctx->txq_idx = i++;
}
return err;
}
int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
const struct genl_info *info = genl_info_dump(cb);
struct net *net = sock_net(skb->sk);
struct net_device *netdev;
u32 ifindex = 0;
int err = 0;
if (info->attrs[NETDEV_A_QUEUE_IFINDEX])
ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
rtnl_lock();
if (ifindex) {
netdev = __dev_get_by_index(net, ifindex);
if (netdev)
err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
else
err = -ENODEV;
} else {
for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
if (err < 0)
break;
ctx->rxq_idx = 0;
ctx->txq_idx = 0;
}
}
rtnl_unlock();
return err;
}
static int netdev_genl_netdevice_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
switch (event) {
case NETDEV_REGISTER:
netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF);
break;
case NETDEV_UNREGISTER:
netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF);
break;
case NETDEV_XDP_FEAT_CHANGE:
netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF);
break;
}
return NOTIFY_OK;
}
static struct notifier_block netdev_genl_nb = {
.notifier_call = netdev_genl_netdevice_event,
};
static int __init netdev_genl_init(void)
{
int err;
err = register_netdevice_notifier(&netdev_genl_nb);
if (err)
return err;
err = genl_register_family(&netdev_nl_family);
if (err)
goto err_unreg_ntf;
return 0;
err_unreg_ntf:
unregister_netdevice_notifier(&netdev_genl_nb);
return err;
}
subsys_initcall(netdev_genl_init);
|