1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/netdevice.h>
4#include <linux/notifier.h>
5#include <linux/rtnetlink.h>
6#include <net/net_namespace.h>
7#include <net/sock.h>
8#include <net/xdp.h>
9#include <net/xdp_sock.h>
10#include <net/netdev_rx_queue.h>
11#include <net/netdev_queues.h>
12#include <net/busy_poll.h>
13
14#include "netdev-genl-gen.h"
15#include "dev.h"
16
17struct netdev_nl_dump_ctx {
18 unsigned long ifindex;
19 unsigned int rxq_idx;
20 unsigned int txq_idx;
21 unsigned int napi_id;
22};
23
24static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb)
25{
26 NL_ASSERT_DUMP_CTX_FITS(struct netdev_nl_dump_ctx);
27
28 return (struct netdev_nl_dump_ctx *)cb->ctx;
29}
30
31static int
32netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
33 const struct genl_info *info)
34{
35 u64 xsk_features = 0;
36 u64 xdp_rx_meta = 0;
37 void *hdr;
38
39 hdr = genlmsg_iput(skb: rsp, info);
40 if (!hdr)
41 return -EMSGSIZE;
42
43#define XDP_METADATA_KFUNC(_, flag, __, xmo) \
44 if (netdev->xdp_metadata_ops && netdev->xdp_metadata_ops->xmo) \
45 xdp_rx_meta |= flag;
46XDP_METADATA_KFUNC_xxx
47#undef XDP_METADATA_KFUNC
48
49 if (netdev->xsk_tx_metadata_ops) {
50 if (netdev->xsk_tx_metadata_ops->tmo_fill_timestamp)
51 xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP;
52 if (netdev->xsk_tx_metadata_ops->tmo_request_checksum)
53 xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM;
54 }
55
56 if (nla_put_u32(skb: rsp, attrtype: NETDEV_A_DEV_IFINDEX, value: netdev->ifindex) ||
57 nla_put_u64_64bit(skb: rsp, attrtype: NETDEV_A_DEV_XDP_FEATURES,
58 value: netdev->xdp_features, padattr: NETDEV_A_DEV_PAD) ||
59 nla_put_u64_64bit(skb: rsp, attrtype: NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
60 value: xdp_rx_meta, padattr: NETDEV_A_DEV_PAD) ||
61 nla_put_u64_64bit(skb: rsp, attrtype: NETDEV_A_DEV_XSK_FEATURES,
62 value: xsk_features, padattr: NETDEV_A_DEV_PAD)) {
63 genlmsg_cancel(skb: rsp, hdr);
64 return -EINVAL;
65 }
66
67 if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) {
68 if (nla_put_u32(skb: rsp, attrtype: NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
69 value: netdev->xdp_zc_max_segs)) {
70 genlmsg_cancel(skb: rsp, hdr);
71 return -EINVAL;
72 }
73 }
74
75 genlmsg_end(skb: rsp, hdr);
76
77 return 0;
78}
79
80static void
81netdev_genl_dev_notify(struct net_device *netdev, int cmd)
82{
83 struct genl_info info;
84 struct sk_buff *ntf;
85
86 if (!genl_has_listeners(family: &netdev_nl_family, net: dev_net(dev: netdev),
87 group: NETDEV_NLGRP_MGMT))
88 return;
89
90 genl_info_init_ntf(info: &info, family: &netdev_nl_family, cmd);
91
92 ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
93 if (!ntf)
94 return;
95
96 if (netdev_nl_dev_fill(netdev, rsp: ntf, info: &info)) {
97 nlmsg_free(skb: ntf);
98 return;
99 }
100
101 genlmsg_multicast_netns(family: &netdev_nl_family, net: dev_net(dev: netdev), skb: ntf,
102 portid: 0, group: NETDEV_NLGRP_MGMT, GFP_KERNEL);
103}
104
105int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
106{
107 struct net_device *netdev;
108 struct sk_buff *rsp;
109 u32 ifindex;
110 int err;
111
112 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX))
113 return -EINVAL;
114
115 ifindex = nla_get_u32(nla: info->attrs[NETDEV_A_DEV_IFINDEX]);
116
117 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
118 if (!rsp)
119 return -ENOMEM;
120
121 rtnl_lock();
122
123 netdev = __dev_get_by_index(net: genl_info_net(info), ifindex);
124 if (netdev)
125 err = netdev_nl_dev_fill(netdev, rsp, info);
126 else
127 err = -ENODEV;
128
129 rtnl_unlock();
130
131 if (err)
132 goto err_free_msg;
133
134 return genlmsg_reply(skb: rsp, info);
135
136err_free_msg:
137 nlmsg_free(skb: rsp);
138 return err;
139}
140
141int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
142{
143 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
144 struct net *net = sock_net(sk: skb->sk);
145 struct net_device *netdev;
146 int err = 0;
147
148 rtnl_lock();
149 for_each_netdev_dump(net, netdev, ctx->ifindex) {
150 err = netdev_nl_dev_fill(netdev, rsp: skb, info: genl_info_dump(cb));
151 if (err < 0)
152 break;
153 }
154 rtnl_unlock();
155
156 return err;
157}
158
159static int
160netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
161 const struct genl_info *info)
162{
163 void *hdr;
164 pid_t pid;
165
166 if (WARN_ON_ONCE(!napi->dev))
167 return -EINVAL;
168 if (!(napi->dev->flags & IFF_UP))
169 return 0;
170
171 hdr = genlmsg_iput(skb: rsp, info);
172 if (!hdr)
173 return -EMSGSIZE;
174
175 if (napi->napi_id >= MIN_NAPI_ID &&
176 nla_put_u32(skb: rsp, attrtype: NETDEV_A_NAPI_ID, value: napi->napi_id))
177 goto nla_put_failure;
178
179 if (nla_put_u32(skb: rsp, attrtype: NETDEV_A_NAPI_IFINDEX, value: napi->dev->ifindex))
180 goto nla_put_failure;
181
182 if (napi->irq >= 0 && nla_put_u32(skb: rsp, attrtype: NETDEV_A_NAPI_IRQ, value: napi->irq))
183 goto nla_put_failure;
184
185 if (napi->thread) {
186 pid = task_pid_nr(tsk: napi->thread);
187 if (nla_put_u32(skb: rsp, attrtype: NETDEV_A_NAPI_PID, value: pid))
188 goto nla_put_failure;
189 }
190
191 genlmsg_end(skb: rsp, hdr);
192
193 return 0;
194
195nla_put_failure:
196 genlmsg_cancel(skb: rsp, hdr);
197 return -EMSGSIZE;
198}
199
200int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
201{
202 struct napi_struct *napi;
203 struct sk_buff *rsp;
204 u32 napi_id;
205 int err;
206
207 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID))
208 return -EINVAL;
209
210 napi_id = nla_get_u32(nla: info->attrs[NETDEV_A_NAPI_ID]);
211
212 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
213 if (!rsp)
214 return -ENOMEM;
215
216 rtnl_lock();
217
218 napi = napi_by_id(napi_id);
219 if (napi)
220 err = netdev_nl_napi_fill_one(rsp, napi, info);
221 else
222 err = -EINVAL;
223
224 rtnl_unlock();
225
226 if (err)
227 goto err_free_msg;
228
229 return genlmsg_reply(skb: rsp, info);
230
231err_free_msg:
232 nlmsg_free(skb: rsp);
233 return err;
234}
235
236static int
237netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp,
238 const struct genl_info *info,
239 struct netdev_nl_dump_ctx *ctx)
240{
241 struct napi_struct *napi;
242 int err = 0;
243
244 if (!(netdev->flags & IFF_UP))
245 return err;
246
247 list_for_each_entry(napi, &netdev->napi_list, dev_list) {
248 if (ctx->napi_id && napi->napi_id >= ctx->napi_id)
249 continue;
250
251 err = netdev_nl_napi_fill_one(rsp, napi, info);
252 if (err)
253 return err;
254 ctx->napi_id = napi->napi_id;
255 }
256 return err;
257}
258
259int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
260{
261 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
262 const struct genl_info *info = genl_info_dump(cb);
263 struct net *net = sock_net(sk: skb->sk);
264 struct net_device *netdev;
265 u32 ifindex = 0;
266 int err = 0;
267
268 if (info->attrs[NETDEV_A_NAPI_IFINDEX])
269 ifindex = nla_get_u32(nla: info->attrs[NETDEV_A_NAPI_IFINDEX]);
270
271 rtnl_lock();
272 if (ifindex) {
273 netdev = __dev_get_by_index(net, ifindex);
274 if (netdev)
275 err = netdev_nl_napi_dump_one(netdev, rsp: skb, info, ctx);
276 else
277 err = -ENODEV;
278 } else {
279 for_each_netdev_dump(net, netdev, ctx->ifindex) {
280 err = netdev_nl_napi_dump_one(netdev, rsp: skb, info, ctx);
281 if (err < 0)
282 break;
283 ctx->napi_id = 0;
284 }
285 }
286 rtnl_unlock();
287
288 return err;
289}
290
291static int
292netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
293 u32 q_idx, u32 q_type, const struct genl_info *info)
294{
295 struct netdev_rx_queue *rxq;
296 struct netdev_queue *txq;
297 void *hdr;
298
299 hdr = genlmsg_iput(skb: rsp, info);
300 if (!hdr)
301 return -EMSGSIZE;
302
303 if (nla_put_u32(skb: rsp, attrtype: NETDEV_A_QUEUE_ID, value: q_idx) ||
304 nla_put_u32(skb: rsp, attrtype: NETDEV_A_QUEUE_TYPE, value: q_type) ||
305 nla_put_u32(skb: rsp, attrtype: NETDEV_A_QUEUE_IFINDEX, value: netdev->ifindex))
306 goto nla_put_failure;
307
308 switch (q_type) {
309 case NETDEV_QUEUE_TYPE_RX:
310 rxq = __netif_get_rx_queue(dev: netdev, rxq: q_idx);
311 if (rxq->napi && nla_put_u32(skb: rsp, attrtype: NETDEV_A_QUEUE_NAPI_ID,
312 value: rxq->napi->napi_id))
313 goto nla_put_failure;
314 break;
315 case NETDEV_QUEUE_TYPE_TX:
316 txq = netdev_get_tx_queue(dev: netdev, index: q_idx);
317 if (txq->napi && nla_put_u32(skb: rsp, attrtype: NETDEV_A_QUEUE_NAPI_ID,
318 value: txq->napi->napi_id))
319 goto nla_put_failure;
320 }
321
322 genlmsg_end(skb: rsp, hdr);
323
324 return 0;
325
326nla_put_failure:
327 genlmsg_cancel(skb: rsp, hdr);
328 return -EMSGSIZE;
329}
330
331static int netdev_nl_queue_validate(struct net_device *netdev, u32 q_id,
332 u32 q_type)
333{
334 switch (q_type) {
335 case NETDEV_QUEUE_TYPE_RX:
336 if (q_id >= netdev->real_num_rx_queues)
337 return -EINVAL;
338 return 0;
339 case NETDEV_QUEUE_TYPE_TX:
340 if (q_id >= netdev->real_num_tx_queues)
341 return -EINVAL;
342 }
343 return 0;
344}
345
346static int
347netdev_nl_queue_fill(struct sk_buff *rsp, struct net_device *netdev, u32 q_idx,
348 u32 q_type, const struct genl_info *info)
349{
350 int err = 0;
351
352 if (!(netdev->flags & IFF_UP))
353 return err;
354
355 err = netdev_nl_queue_validate(netdev, q_id: q_idx, q_type);
356 if (err)
357 return err;
358
359 return netdev_nl_queue_fill_one(rsp, netdev, q_idx, q_type, info);
360}
361
362int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info)
363{
364 u32 q_id, q_type, ifindex;
365 struct net_device *netdev;
366 struct sk_buff *rsp;
367 int err;
368
369 if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_ID) ||
370 GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_TYPE) ||
371 GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFINDEX))
372 return -EINVAL;
373
374 q_id = nla_get_u32(nla: info->attrs[NETDEV_A_QUEUE_ID]);
375 q_type = nla_get_u32(nla: info->attrs[NETDEV_A_QUEUE_TYPE]);
376 ifindex = nla_get_u32(nla: info->attrs[NETDEV_A_QUEUE_IFINDEX]);
377
378 rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
379 if (!rsp)
380 return -ENOMEM;
381
382 rtnl_lock();
383
384 netdev = __dev_get_by_index(net: genl_info_net(info), ifindex);
385 if (netdev)
386 err = netdev_nl_queue_fill(rsp, netdev, q_idx: q_id, q_type, info);
387 else
388 err = -ENODEV;
389
390 rtnl_unlock();
391
392 if (err)
393 goto err_free_msg;
394
395 return genlmsg_reply(skb: rsp, info);
396
397err_free_msg:
398 nlmsg_free(skb: rsp);
399 return err;
400}
401
402static int
403netdev_nl_queue_dump_one(struct net_device *netdev, struct sk_buff *rsp,
404 const struct genl_info *info,
405 struct netdev_nl_dump_ctx *ctx)
406{
407 int err = 0;
408 int i;
409
410 if (!(netdev->flags & IFF_UP))
411 return err;
412
413 for (i = ctx->rxq_idx; i < netdev->real_num_rx_queues;) {
414 err = netdev_nl_queue_fill_one(rsp, netdev, q_idx: i,
415 q_type: NETDEV_QUEUE_TYPE_RX, info);
416 if (err)
417 return err;
418 ctx->rxq_idx = i++;
419 }
420 for (i = ctx->txq_idx; i < netdev->real_num_tx_queues;) {
421 err = netdev_nl_queue_fill_one(rsp, netdev, q_idx: i,
422 q_type: NETDEV_QUEUE_TYPE_TX, info);
423 if (err)
424 return err;
425 ctx->txq_idx = i++;
426 }
427
428 return err;
429}
430
431int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
432{
433 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
434 const struct genl_info *info = genl_info_dump(cb);
435 struct net *net = sock_net(sk: skb->sk);
436 struct net_device *netdev;
437 u32 ifindex = 0;
438 int err = 0;
439
440 if (info->attrs[NETDEV_A_QUEUE_IFINDEX])
441 ifindex = nla_get_u32(nla: info->attrs[NETDEV_A_QUEUE_IFINDEX]);
442
443 rtnl_lock();
444 if (ifindex) {
445 netdev = __dev_get_by_index(net, ifindex);
446 if (netdev)
447 err = netdev_nl_queue_dump_one(netdev, rsp: skb, info, ctx);
448 else
449 err = -ENODEV;
450 } else {
451 for_each_netdev_dump(net, netdev, ctx->ifindex) {
452 err = netdev_nl_queue_dump_one(netdev, rsp: skb, info, ctx);
453 if (err < 0)
454 break;
455 ctx->rxq_idx = 0;
456 ctx->txq_idx = 0;
457 }
458 }
459 rtnl_unlock();
460
461 return err;
462}
463
464#define NETDEV_STAT_NOT_SET (~0ULL)
465
466static void netdev_nl_stats_add(void *_sum, const void *_add, size_t size)
467{
468 const u64 *add = _add;
469 u64 *sum = _sum;
470
471 while (size) {
472 if (*add != NETDEV_STAT_NOT_SET && *sum != NETDEV_STAT_NOT_SET)
473 *sum += *add;
474 sum++;
475 add++;
476 size -= 8;
477 }
478}
479
480static int netdev_stat_put(struct sk_buff *rsp, unsigned int attr_id, u64 value)
481{
482 if (value == NETDEV_STAT_NOT_SET)
483 return 0;
484 return nla_put_uint(skb: rsp, attrtype: attr_id, value);
485}
486
487static int
488netdev_nl_stats_write_rx(struct sk_buff *rsp, struct netdev_queue_stats_rx *rx)
489{
490 if (netdev_stat_put(rsp, attr_id: NETDEV_A_QSTATS_RX_PACKETS, value: rx->packets) ||
491 netdev_stat_put(rsp, attr_id: NETDEV_A_QSTATS_RX_BYTES, value: rx->bytes) ||
492 netdev_stat_put(rsp, attr_id: NETDEV_A_QSTATS_RX_ALLOC_FAIL, value: rx->alloc_fail))
493 return -EMSGSIZE;
494 return 0;
495}
496
497static int
498netdev_nl_stats_write_tx(struct sk_buff *rsp, struct netdev_queue_stats_tx *tx)
499{
500 if (netdev_stat_put(rsp, attr_id: NETDEV_A_QSTATS_TX_PACKETS, value: tx->packets) ||
501 netdev_stat_put(rsp, attr_id: NETDEV_A_QSTATS_TX_BYTES, value: tx->bytes))
502 return -EMSGSIZE;
503 return 0;
504}
505
506static int
507netdev_nl_stats_queue(struct net_device *netdev, struct sk_buff *rsp,
508 u32 q_type, int i, const struct genl_info *info)
509{
510 const struct netdev_stat_ops *ops = netdev->stat_ops;
511 struct netdev_queue_stats_rx rx;
512 struct netdev_queue_stats_tx tx;
513 void *hdr;
514
515 hdr = genlmsg_iput(skb: rsp, info);
516 if (!hdr)
517 return -EMSGSIZE;
518 if (nla_put_u32(skb: rsp, attrtype: NETDEV_A_QSTATS_IFINDEX, value: netdev->ifindex) ||
519 nla_put_u32(skb: rsp, attrtype: NETDEV_A_QSTATS_QUEUE_TYPE, value: q_type) ||
520 nla_put_u32(skb: rsp, attrtype: NETDEV_A_QSTATS_QUEUE_ID, value: i))
521 goto nla_put_failure;
522
523 switch (q_type) {
524 case NETDEV_QUEUE_TYPE_RX:
525 memset(&rx, 0xff, sizeof(rx));
526 ops->get_queue_stats_rx(netdev, i, &rx);
527 if (!memchr_inv(p: &rx, c: 0xff, size: sizeof(rx)))
528 goto nla_cancel;
529 if (netdev_nl_stats_write_rx(rsp, rx: &rx))
530 goto nla_put_failure;
531 break;
532 case NETDEV_QUEUE_TYPE_TX:
533 memset(&tx, 0xff, sizeof(tx));
534 ops->get_queue_stats_tx(netdev, i, &tx);
535 if (!memchr_inv(p: &tx, c: 0xff, size: sizeof(tx)))
536 goto nla_cancel;
537 if (netdev_nl_stats_write_tx(rsp, tx: &tx))
538 goto nla_put_failure;
539 break;
540 }
541
542 genlmsg_end(skb: rsp, hdr);
543 return 0;
544
545nla_cancel:
546 genlmsg_cancel(skb: rsp, hdr);
547 return 0;
548nla_put_failure:
549 genlmsg_cancel(skb: rsp, hdr);
550 return -EMSGSIZE;
551}
552
553static int
554netdev_nl_stats_by_queue(struct net_device *netdev, struct sk_buff *rsp,
555 const struct genl_info *info,
556 struct netdev_nl_dump_ctx *ctx)
557{
558 const struct netdev_stat_ops *ops = netdev->stat_ops;
559 int i, err;
560
561 if (!(netdev->flags & IFF_UP))
562 return 0;
563
564 i = ctx->rxq_idx;
565 while (ops->get_queue_stats_rx && i < netdev->real_num_rx_queues) {
566 err = netdev_nl_stats_queue(netdev, rsp, q_type: NETDEV_QUEUE_TYPE_RX,
567 i, info);
568 if (err)
569 return err;
570 ctx->rxq_idx = i++;
571 }
572 i = ctx->txq_idx;
573 while (ops->get_queue_stats_tx && i < netdev->real_num_tx_queues) {
574 err = netdev_nl_stats_queue(netdev, rsp, q_type: NETDEV_QUEUE_TYPE_TX,
575 i, info);
576 if (err)
577 return err;
578 ctx->txq_idx = i++;
579 }
580
581 ctx->rxq_idx = 0;
582 ctx->txq_idx = 0;
583 return 0;
584}
585
586static int
587netdev_nl_stats_by_netdev(struct net_device *netdev, struct sk_buff *rsp,
588 const struct genl_info *info)
589{
590 struct netdev_queue_stats_rx rx_sum, rx;
591 struct netdev_queue_stats_tx tx_sum, tx;
592 const struct netdev_stat_ops *ops;
593 void *hdr;
594 int i;
595
596 ops = netdev->stat_ops;
597 /* Netdev can't guarantee any complete counters */
598 if (!ops->get_base_stats)
599 return 0;
600
601 memset(&rx_sum, 0xff, sizeof(rx_sum));
602 memset(&tx_sum, 0xff, sizeof(tx_sum));
603
604 ops->get_base_stats(netdev, &rx_sum, &tx_sum);
605
606 /* The op was there, but nothing reported, don't bother */
607 if (!memchr_inv(p: &rx_sum, c: 0xff, size: sizeof(rx_sum)) &&
608 !memchr_inv(p: &tx_sum, c: 0xff, size: sizeof(tx_sum)))
609 return 0;
610
611 hdr = genlmsg_iput(skb: rsp, info);
612 if (!hdr)
613 return -EMSGSIZE;
614 if (nla_put_u32(skb: rsp, attrtype: NETDEV_A_QSTATS_IFINDEX, value: netdev->ifindex))
615 goto nla_put_failure;
616
617 for (i = 0; i < netdev->real_num_rx_queues; i++) {
618 memset(&rx, 0xff, sizeof(rx));
619 if (ops->get_queue_stats_rx)
620 ops->get_queue_stats_rx(netdev, i, &rx);
621 netdev_nl_stats_add(sum: &rx_sum, add: &rx, size: sizeof(rx));
622 }
623 for (i = 0; i < netdev->real_num_tx_queues; i++) {
624 memset(&tx, 0xff, sizeof(tx));
625 if (ops->get_queue_stats_tx)
626 ops->get_queue_stats_tx(netdev, i, &tx);
627 netdev_nl_stats_add(sum: &tx_sum, add: &tx, size: sizeof(tx));
628 }
629
630 if (netdev_nl_stats_write_rx(rsp, rx: &rx_sum) ||
631 netdev_nl_stats_write_tx(rsp, tx: &tx_sum))
632 goto nla_put_failure;
633
634 genlmsg_end(skb: rsp, hdr);
635 return 0;
636
637nla_put_failure:
638 genlmsg_cancel(skb: rsp, hdr);
639 return -EMSGSIZE;
640}
641
642int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
643 struct netlink_callback *cb)
644{
645 struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
646 const struct genl_info *info = genl_info_dump(cb);
647 struct net *net = sock_net(sk: skb->sk);
648 struct net_device *netdev;
649 unsigned int scope;
650 int err = 0;
651
652 scope = 0;
653 if (info->attrs[NETDEV_A_QSTATS_SCOPE])
654 scope = nla_get_uint(nla: info->attrs[NETDEV_A_QSTATS_SCOPE]);
655
656 rtnl_lock();
657 for_each_netdev_dump(net, netdev, ctx->ifindex) {
658 if (!netdev->stat_ops)
659 continue;
660
661 switch (scope) {
662 case 0:
663 err = netdev_nl_stats_by_netdev(netdev, rsp: skb, info);
664 break;
665 case NETDEV_QSTATS_SCOPE_QUEUE:
666 err = netdev_nl_stats_by_queue(netdev, rsp: skb, info, ctx);
667 break;
668 }
669 if (err < 0)
670 break;
671 }
672 rtnl_unlock();
673
674 return err;
675}
676
677static int netdev_genl_netdevice_event(struct notifier_block *nb,
678 unsigned long event, void *ptr)
679{
680 struct net_device *netdev = netdev_notifier_info_to_dev(info: ptr);
681
682 switch (event) {
683 case NETDEV_REGISTER:
684 netdev_genl_dev_notify(netdev, cmd: NETDEV_CMD_DEV_ADD_NTF);
685 break;
686 case NETDEV_UNREGISTER:
687 netdev_genl_dev_notify(netdev, cmd: NETDEV_CMD_DEV_DEL_NTF);
688 break;
689 case NETDEV_XDP_FEAT_CHANGE:
690 netdev_genl_dev_notify(netdev, cmd: NETDEV_CMD_DEV_CHANGE_NTF);
691 break;
692 }
693
694 return NOTIFY_OK;
695}
696
697static struct notifier_block netdev_genl_nb = {
698 .notifier_call = netdev_genl_netdevice_event,
699};
700
701static int __init netdev_genl_init(void)
702{
703 int err;
704
705 err = register_netdevice_notifier(nb: &netdev_genl_nb);
706 if (err)
707 return err;
708
709 err = genl_register_family(family: &netdev_nl_family);
710 if (err)
711 goto err_unreg_ntf;
712
713 return 0;
714
715err_unreg_ntf:
716 unregister_netdevice_notifier(nb: &netdev_genl_nb);
717 return err;
718}
719
720subsys_initcall(netdev_genl_init);
721

source code of linux/net/core/netdev-genl.c