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raw: use more conventional iterators
[linux-block.git] / net / ipv6 / ioam6.c
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9ee11f0f
JI		 1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * IPv6 IOAM implementation
4 *
5 * Author:
6 * Justin Iurman <justin.iurman@uliege.be>
7 */
8
9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/net.h>
13#include <linux/ioam6.h>
8c6f6fa6 14#include <linux/ioam6_genl.h>
9ee11f0f 15#include <linux/rhashtable.h>
b63c5478 16#include <linux/netdevice.h>
9ee11f0f
JI		 17
18#include <net/addrconf.h>
8c6f6fa6 19#include <net/genetlink.h>
9ee11f0f 20#include <net/ioam6.h>
b63c5478 21#include <net/sch_generic.h>
9ee11f0f
JI		 22
23static void ioam6_ns_release(struct ioam6_namespace *ns)
24{
25 kfree_rcu(ns, rcu);
26}
27
28static void ioam6_sc_release(struct ioam6_schema *sc)
29{
30 kfree_rcu(sc, rcu);
31}
32
33static void ioam6_free_ns(void *ptr, void *arg)
34{
35 struct ioam6_namespace *ns = (struct ioam6_namespace *)ptr;
36
37 if (ns)
38 ioam6_ns_release(ns);
39}
40
41static void ioam6_free_sc(void *ptr, void *arg)
42{
43 struct ioam6_schema *sc = (struct ioam6_schema *)ptr;
44
45 if (sc)
46 ioam6_sc_release(sc);
47}
48
49static int ioam6_ns_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
50{
51 const struct ioam6_namespace *ns = obj;
52
53 return (ns->id != *(__be16 *)arg->key);
54}
55
56static int ioam6_sc_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
57{
58 const struct ioam6_schema *sc = obj;
59
60 return (sc->id != *(u32 *)arg->key);
61}
62
63static const struct rhashtable_params rht_ns_params = {
64 .key_len = sizeof(__be16),
65 .key_offset = offsetof(struct ioam6_namespace, id),
66 .head_offset = offsetof(struct ioam6_namespace, head),
67 .automatic_shrinking = true,
68 .obj_cmpfn = ioam6_ns_cmpfn,
69};
70
71static const struct rhashtable_params rht_sc_params = {
72 .key_len = sizeof(u32),
73 .key_offset = offsetof(struct ioam6_schema, id),
74 .head_offset = offsetof(struct ioam6_schema, head),
75 .automatic_shrinking = true,
76 .obj_cmpfn = ioam6_sc_cmpfn,
77};
78
8c6f6fa6
JI		 79static struct genl_family ioam6_genl_family;
80
81static const struct nla_policy ioam6_genl_policy_addns[] = {
82 [IOAM6_ATTR_NS_ID] = { .type = NLA_U16 },
83 [IOAM6_ATTR_NS_DATA] = { .type = NLA_U32 },
84 [IOAM6_ATTR_NS_DATA_WIDE] = { .type = NLA_U64 },
85};
86
87static const struct nla_policy ioam6_genl_policy_delns[] = {
88 [IOAM6_ATTR_NS_ID] = { .type = NLA_U16 },
89};
90
91static const struct nla_policy ioam6_genl_policy_addsc[] = {
92 [IOAM6_ATTR_SC_ID] = { .type = NLA_U32 },
93 [IOAM6_ATTR_SC_DATA] = { .type = NLA_BINARY,
94 .len = IOAM6_MAX_SCHEMA_DATA_LEN },
95};
96
97static const struct nla_policy ioam6_genl_policy_delsc[] = {
98 [IOAM6_ATTR_SC_ID] = { .type = NLA_U32 },
99};
100
101static const struct nla_policy ioam6_genl_policy_ns_sc[] = {
102 [IOAM6_ATTR_NS_ID] = { .type = NLA_U16 },
103 [IOAM6_ATTR_SC_ID] = { .type = NLA_U32 },
104 [IOAM6_ATTR_SC_NONE] = { .type = NLA_FLAG },
105};
106
107static int ioam6_genl_addns(struct sk_buff *skb, struct genl_info *info)
108{
109 struct ioam6_pernet_data *nsdata;
110 struct ioam6_namespace *ns;
111 u64 data64;
112 u32 data32;
113 __be16 id;
114 int err;
115
116 if (!info->attrs[IOAM6_ATTR_NS_ID])
117 return -EINVAL;
118
119 id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
120 nsdata = ioam6_pernet(genl_info_net(info));
121
122 mutex_lock(&nsdata->lock);
123
124 ns = rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
125 if (ns) {
126 err = -EEXIST;
127 goto out_unlock;
128 }
129
130 ns = kzalloc(sizeof(*ns), GFP_KERNEL);
131 if (!ns) {
132 err = -ENOMEM;
133 goto out_unlock;
134 }
135
136 ns->id = id;
137
138 if (!info->attrs[IOAM6_ATTR_NS_DATA])
139 data32 = IOAM6_U32_UNAVAILABLE;
140 else
141 data32 = nla_get_u32(info->attrs[IOAM6_ATTR_NS_DATA]);
142
143 if (!info->attrs[IOAM6_ATTR_NS_DATA_WIDE])
144 data64 = IOAM6_U64_UNAVAILABLE;
145 else
146 data64 = nla_get_u64(info->attrs[IOAM6_ATTR_NS_DATA_WIDE]);
147
148 ns->data = cpu_to_be32(data32);
149 ns->data_wide = cpu_to_be64(data64);
150
151 err = rhashtable_lookup_insert_fast(&nsdata->namespaces, &ns->head,
152 rht_ns_params);
153 if (err)
154 kfree(ns);
155
156out_unlock:
157 mutex_unlock(&nsdata->lock);
158 return err;
159}
160
161static int ioam6_genl_delns(struct sk_buff *skb, struct genl_info *info)
162{
163 struct ioam6_pernet_data *nsdata;
164 struct ioam6_namespace *ns;
165 struct ioam6_schema *sc;
166 __be16 id;
167 int err;
168
169 if (!info->attrs[IOAM6_ATTR_NS_ID])
170 return -EINVAL;
171
172 id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
173 nsdata = ioam6_pernet(genl_info_net(info));
174
175 mutex_lock(&nsdata->lock);
176
177 ns = rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
178 if (!ns) {
179 err = -ENOENT;
180 goto out_unlock;
181 }
182
183 sc = rcu_dereference_protected(ns->schema,
184 lockdep_is_held(&nsdata->lock));
185
186 err = rhashtable_remove_fast(&nsdata->namespaces, &ns->head,
187 rht_ns_params);
188 if (err)
189 goto out_unlock;
190
191 if (sc)
192 rcu_assign_pointer(sc->ns, NULL);
193
194 ioam6_ns_release(ns);
195
196out_unlock:
197 mutex_unlock(&nsdata->lock);
198 return err;
199}
200
201static int __ioam6_genl_dumpns_element(struct ioam6_namespace *ns,
202 u32 portid,
203 u32 seq,
204 u32 flags,
205 struct sk_buff *skb,
206 u8 cmd)
207{
208 struct ioam6_schema *sc;
209 u64 data64;
210 u32 data32;
211 void *hdr;
212
213 hdr = genlmsg_put(skb, portid, seq, &ioam6_genl_family, flags, cmd);
214 if (!hdr)
215 return -ENOMEM;
216
217 data32 = be32_to_cpu(ns->data);
218 data64 = be64_to_cpu(ns->data_wide);
219
220 if (nla_put_u16(skb, IOAM6_ATTR_NS_ID, be16_to_cpu(ns->id)) ||
221 (data32 != IOAM6_U32_UNAVAILABLE &&
222 nla_put_u32(skb, IOAM6_ATTR_NS_DATA, data32)) ||
223 (data64 != IOAM6_U64_UNAVAILABLE &&
224 nla_put_u64_64bit(skb, IOAM6_ATTR_NS_DATA_WIDE,
225 data64, IOAM6_ATTR_PAD)))
226 goto nla_put_failure;
227
228 rcu_read_lock();
229
230 sc = rcu_dereference(ns->schema);
231 if (sc && nla_put_u32(skb, IOAM6_ATTR_SC_ID, sc->id)) {
232 rcu_read_unlock();
233 goto nla_put_failure;
234 }
235
236 rcu_read_unlock();
237
238 genlmsg_end(skb, hdr);
239 return 0;
240
241nla_put_failure:
242 genlmsg_cancel(skb, hdr);
243 return -EMSGSIZE;
244}
245
246static int ioam6_genl_dumpns_start(struct netlink_callback *cb)
247{
248 struct ioam6_pernet_data *nsdata = ioam6_pernet(sock_net(cb->skb->sk));
249 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
250
251 if (!iter) {
252 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
253 if (!iter)
254 return -ENOMEM;
255
256 cb->args[0] = (long)iter;
257 }
258
259 rhashtable_walk_enter(&nsdata->namespaces, iter);
260
261 return 0;
262}
263
264static int ioam6_genl_dumpns_done(struct netlink_callback *cb)
265{
266 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
267
268 rhashtable_walk_exit(iter);
269 kfree(iter);
270
271 return 0;
272}
273
274static int ioam6_genl_dumpns(struct sk_buff *skb, struct netlink_callback *cb)
275{
276 struct rhashtable_iter *iter;
277 struct ioam6_namespace *ns;
278 int err;
279
280 iter = (struct rhashtable_iter *)cb->args[0];
281 rhashtable_walk_start(iter);
282
283 for (;;) {
284 ns = rhashtable_walk_next(iter);
285
286 if (IS_ERR(ns)) {
287 if (PTR_ERR(ns) == -EAGAIN)
288 continue;
289 err = PTR_ERR(ns);
290 goto done;
291 } else if (!ns) {
292 break;
293 }
294
295 err = __ioam6_genl_dumpns_element(ns,
296 NETLINK_CB(cb->skb).portid,
297 cb->nlh->nlmsg_seq,
298 NLM_F_MULTI,
299 skb,
300 IOAM6_CMD_DUMP_NAMESPACES);
301 if (err)
302 goto done;
303 }
304
305 err = skb->len;
306
307done:
308 rhashtable_walk_stop(iter);
309 return err;
310}
311
312static int ioam6_genl_addsc(struct sk_buff *skb, struct genl_info *info)
313{
314 struct ioam6_pernet_data *nsdata;
315 int len, len_aligned, err;
316 struct ioam6_schema *sc;
317 u32 id;
318
319 if (!info->attrs[IOAM6_ATTR_SC_ID] || !info->attrs[IOAM6_ATTR_SC_DATA])
320 return -EINVAL;
321
322 id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
323 nsdata = ioam6_pernet(genl_info_net(info));
324
325 mutex_lock(&nsdata->lock);
326
327 sc = rhashtable_lookup_fast(&nsdata->schemas, &id, rht_sc_params);
328 if (sc) {
329 err = -EEXIST;
330 goto out_unlock;
331 }
332
333 len = nla_len(info->attrs[IOAM6_ATTR_SC_DATA]);
334 len_aligned = ALIGN(len, 4);
335
336 sc = kzalloc(sizeof(*sc) + len_aligned, GFP_KERNEL);
337 if (!sc) {
338 err = -ENOMEM;
339 goto out_unlock;
340 }
341
342 sc->id = id;
343 sc->len = len_aligned;
344 sc->hdr = cpu_to_be32(sc->id | ((u8)(sc->len / 4) << 24));
345 nla_memcpy(sc->data, info->attrs[IOAM6_ATTR_SC_DATA], len);
346
347 err = rhashtable_lookup_insert_fast(&nsdata->schemas, &sc->head,
348 rht_sc_params);
349 if (err)
350 goto free_sc;
351
352out_unlock:
353 mutex_unlock(&nsdata->lock);
354 return err;
355free_sc:
356 kfree(sc);
357 goto out_unlock;
358}
359
360static int ioam6_genl_delsc(struct sk_buff *skb, struct genl_info *info)
361{
362 struct ioam6_pernet_data *nsdata;
363 struct ioam6_namespace *ns;
364 struct ioam6_schema *sc;
365 int err;
366 u32 id;
367
368 if (!info->attrs[IOAM6_ATTR_SC_ID])
369 return -EINVAL;
370
371 id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
372 nsdata = ioam6_pernet(genl_info_net(info));
373
374 mutex_lock(&nsdata->lock);
375
376 sc = rhashtable_lookup_fast(&nsdata->schemas, &id, rht_sc_params);
377 if (!sc) {
378 err = -ENOENT;
379 goto out_unlock;
380 }
381
382 ns = rcu_dereference_protected(sc->ns, lockdep_is_held(&nsdata->lock));
383
384 err = rhashtable_remove_fast(&nsdata->schemas, &sc->head,
385 rht_sc_params);
386 if (err)
387 goto out_unlock;
388
389 if (ns)
390 rcu_assign_pointer(ns->schema, NULL);
391
392 ioam6_sc_release(sc);
393
394out_unlock:
395 mutex_unlock(&nsdata->lock);
396 return err;
397}
398
399static int __ioam6_genl_dumpsc_element(struct ioam6_schema *sc,
400 u32 portid, u32 seq, u32 flags,
401 struct sk_buff *skb, u8 cmd)
402{
403 struct ioam6_namespace *ns;
404 void *hdr;
405
406 hdr = genlmsg_put(skb, portid, seq, &ioam6_genl_family, flags, cmd);
407 if (!hdr)
408 return -ENOMEM;
409
410 if (nla_put_u32(skb, IOAM6_ATTR_SC_ID, sc->id) ||
411 nla_put(skb, IOAM6_ATTR_SC_DATA, sc->len, sc->data))
412 goto nla_put_failure;
413
414 rcu_read_lock();
415
416 ns = rcu_dereference(sc->ns);
417 if (ns && nla_put_u16(skb, IOAM6_ATTR_NS_ID, be16_to_cpu(ns->id))) {
418 rcu_read_unlock();
419 goto nla_put_failure;
420 }
421
422 rcu_read_unlock();
423
424 genlmsg_end(skb, hdr);
425 return 0;
426
427nla_put_failure:
428 genlmsg_cancel(skb, hdr);
429 return -EMSGSIZE;
430}
431
432static int ioam6_genl_dumpsc_start(struct netlink_callback *cb)
433{
434 struct ioam6_pernet_data *nsdata = ioam6_pernet(sock_net(cb->skb->sk));
435 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
436
437 if (!iter) {
438 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
439 if (!iter)
440 return -ENOMEM;
441
442 cb->args[0] = (long)iter;
443 }
444
445 rhashtable_walk_enter(&nsdata->schemas, iter);
446
447 return 0;
448}
449
450static int ioam6_genl_dumpsc_done(struct netlink_callback *cb)
451{
452 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
453
454 rhashtable_walk_exit(iter);
455 kfree(iter);
456
457 return 0;
458}
459
460static int ioam6_genl_dumpsc(struct sk_buff *skb, struct netlink_callback *cb)
461{
462 struct rhashtable_iter *iter;
463 struct ioam6_schema *sc;
464 int err;
465
466 iter = (struct rhashtable_iter *)cb->args[0];
467 rhashtable_walk_start(iter);
468
469 for (;;) {
470 sc = rhashtable_walk_next(iter);
471
472 if (IS_ERR(sc)) {
473 if (PTR_ERR(sc) == -EAGAIN)
474 continue;
475 err = PTR_ERR(sc);
476 goto done;
477 } else if (!sc) {
478 break;
479 }
480
481 err = __ioam6_genl_dumpsc_element(sc,
482 NETLINK_CB(cb->skb).portid,
483 cb->nlh->nlmsg_seq,
484 NLM_F_MULTI,
485 skb,
486 IOAM6_CMD_DUMP_SCHEMAS);
487 if (err)
488 goto done;
489 }
490
491 err = skb->len;
492
493done:
494 rhashtable_walk_stop(iter);
495 return err;
496}
497
498static int ioam6_genl_ns_set_schema(struct sk_buff *skb, struct genl_info *info)
499{
500 struct ioam6_namespace *ns, *ns_ref;
501 struct ioam6_schema *sc, *sc_ref;
502 struct ioam6_pernet_data *nsdata;
503 __be16 ns_id;
504 u32 sc_id;
505 int err;
506
507 if (!info->attrs[IOAM6_ATTR_NS_ID] ||
508 (!info->attrs[IOAM6_ATTR_SC_ID] &&
509 !info->attrs[IOAM6_ATTR_SC_NONE]))
510 return -EINVAL;
511
512 ns_id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
513 nsdata = ioam6_pernet(genl_info_net(info));
514
515 mutex_lock(&nsdata->lock);
516
517 ns = rhashtable_lookup_fast(&nsdata->namespaces, &ns_id, rht_ns_params);
518 if (!ns) {
519 err = -ENOENT;
520 goto out_unlock;
521 }
522
523 if (info->attrs[IOAM6_ATTR_SC_NONE]) {
524 sc = NULL;
525 } else {
526 sc_id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
527 sc = rhashtable_lookup_fast(&nsdata->schemas, &sc_id,
528 rht_sc_params);
529 if (!sc) {
530 err = -ENOENT;
531 goto out_unlock;
532 }
533 }
534
535 sc_ref = rcu_dereference_protected(ns->schema,
536 lockdep_is_held(&nsdata->lock));
537 if (sc_ref)
538 rcu_assign_pointer(sc_ref->ns, NULL);
539 rcu_assign_pointer(ns->schema, sc);
540
541 if (sc) {
542 ns_ref = rcu_dereference_protected(sc->ns,
543 lockdep_is_held(&nsdata->lock));
544 if (ns_ref)
545 rcu_assign_pointer(ns_ref->schema, NULL);
546 rcu_assign_pointer(sc->ns, ns);
547 }
548
549 err = 0;
550
551out_unlock:
552 mutex_unlock(&nsdata->lock);
553 return err;
554}
555
556static const struct genl_ops ioam6_genl_ops[] = {
557 {
558 .cmd = IOAM6_CMD_ADD_NAMESPACE,
559 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
560 .doit = ioam6_genl_addns,
561 .flags = GENL_ADMIN_PERM,
562 .policy = ioam6_genl_policy_addns,
563 .maxattr = ARRAY_SIZE(ioam6_genl_policy_addns) - 1,
564 },
565 {
566 .cmd = IOAM6_CMD_DEL_NAMESPACE,
567 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
568 .doit = ioam6_genl_delns,
569 .flags = GENL_ADMIN_PERM,
570 .policy = ioam6_genl_policy_delns,
571 .maxattr = ARRAY_SIZE(ioam6_genl_policy_delns) - 1,
572 },
573 {
574 .cmd = IOAM6_CMD_DUMP_NAMESPACES,
575 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
576 .start = ioam6_genl_dumpns_start,
577 .dumpit = ioam6_genl_dumpns,
578 .done = ioam6_genl_dumpns_done,
579 .flags = GENL_ADMIN_PERM,
580 },
581 {
582 .cmd = IOAM6_CMD_ADD_SCHEMA,
583 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
584 .doit = ioam6_genl_addsc,
585 .flags = GENL_ADMIN_PERM,
586 .policy = ioam6_genl_policy_addsc,
587 .maxattr = ARRAY_SIZE(ioam6_genl_policy_addsc) - 1,
588 },
589 {
590 .cmd = IOAM6_CMD_DEL_SCHEMA,
591 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
592 .doit = ioam6_genl_delsc,
593 .flags = GENL_ADMIN_PERM,
594 .policy = ioam6_genl_policy_delsc,
595 .maxattr = ARRAY_SIZE(ioam6_genl_policy_delsc) - 1,
596 },
597 {
598 .cmd = IOAM6_CMD_DUMP_SCHEMAS,
599 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
600 .start = ioam6_genl_dumpsc_start,
601 .dumpit = ioam6_genl_dumpsc,
602 .done = ioam6_genl_dumpsc_done,
603 .flags = GENL_ADMIN_PERM,
604 },
605 {
606 .cmd = IOAM6_CMD_NS_SET_SCHEMA,
607 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
608 .doit = ioam6_genl_ns_set_schema,
609 .flags = GENL_ADMIN_PERM,
610 .policy = ioam6_genl_policy_ns_sc,
611 .maxattr = ARRAY_SIZE(ioam6_genl_policy_ns_sc) - 1,
612 },
613};
614
615static struct genl_family ioam6_genl_family __ro_after_init = {
616 .name = IOAM6_GENL_NAME,
617 .version = IOAM6_GENL_VERSION,
618 .netnsok = true,
619 .parallel_ops = true,
620 .ops = ioam6_genl_ops,
621 .n_ops = ARRAY_SIZE(ioam6_genl_ops),
622 .module = THIS_MODULE,
623};
624
9ee11f0f
JI		 625struct ioam6_namespace *ioam6_namespace(struct net *net, __be16 id)
626{
627 struct ioam6_pernet_data *nsdata = ioam6_pernet(net);
628
629 return rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
630}
631
632static void __ioam6_fill_trace_data(struct sk_buff *skb,
633 struct ioam6_namespace *ns,
634 struct ioam6_trace_hdr *trace,
635 struct ioam6_schema *sc,
52d03786 636 u8 sclen, bool is_input)
9ee11f0f 637{
b6561f84
MKL		 638 struct timespec64 ts;
639 ktime_t tstamp;
9ee11f0f
JI		 640 u64 raw64;
641 u32 raw32;
642 u16 raw16;
643 u8 *data;
644 u8 byte;
645
646 data = trace->data + trace->remlen * 4 - trace->nodelen * 4 - sclen * 4;
647
648 /* hop_lim and node_id */
649 if (trace->type.bit0) {
650 byte = ipv6_hdr(skb)->hop_limit;
52d03786 651 if (is_input)
9ee11f0f
JI		 652 byte--;
653
3edede08 654 raw32 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id;
9ee11f0f
JI		 655
656 *(__be32 *)data = cpu_to_be32((byte << 24) | raw32);
657 data += sizeof(__be32);
658 }
659
660 /* ingress_if_id and egress_if_id */
661 if (trace->type.bit1) {
662 if (!skb->dev)
663 raw16 = IOAM6_U16_UNAVAILABLE;
664 else
665 raw16 = (__force u16)__in6_dev_get(skb->dev)->cnf.ioam6_id;
666
667 *(__be16 *)data = cpu_to_be16(raw16);
668 data += sizeof(__be16);
669
670 if (skb_dst(skb)->dev->flags & IFF_LOOPBACK)
671 raw16 = IOAM6_U16_UNAVAILABLE;
672 else
673 raw16 = (__force u16)__in6_dev_get(skb_dst(skb)->dev)->cnf.ioam6_id;
674
675 *(__be16 *)data = cpu_to_be16(raw16);
676 data += sizeof(__be16);
677 }
678
679 /* timestamp seconds */
680 if (trace->type.bit2) {
3edede08
JI		 681 if (!skb->dev) {
682 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
683 } else {
b6561f84
MKL		 684 tstamp = skb_tstamp_cond(skb, true);
685 ts = ktime_to_timespec64(tstamp);
9ee11f0f 686
3edede08
JI		 687 *(__be32 *)data = cpu_to_be32((u32)ts.tv_sec);
688 }
9ee11f0f
JI		 689 data += sizeof(__be32);
690 }
691
692 /* timestamp subseconds */
693 if (trace->type.bit3) {
3edede08
JI		 694 if (!skb->dev) {
695 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
696 } else {
b6561f84
MKL		 697 if (!trace->type.bit2) {
698 tstamp = skb_tstamp_cond(skb, true);
699 ts = ktime_to_timespec64(tstamp);
700 }
9ee11f0f 701
b6561f84 702 *(__be32 *)data = cpu_to_be32((u32)(ts.tv_nsec / NSEC_PER_USEC));
3edede08 703 }
9ee11f0f
JI		 704 data += sizeof(__be32);
705 }
706
707 /* transit delay */
708 if (trace->type.bit4) {
709 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
710 data += sizeof(__be32);
711 }
712
713 /* namespace data */
714 if (trace->type.bit5) {
715 *(__be32 *)data = ns->data;
716 data += sizeof(__be32);
717 }
718
719 /* queue depth */
720 if (trace->type.bit6) {
b63c5478
JI		 721 struct netdev_queue *queue;
722 struct Qdisc *qdisc;
723 __u32 qlen, backlog;
724
725 if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
726 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
727 } else {
728 queue = skb_get_tx_queue(skb_dst(skb)->dev, skb);
729 qdisc = rcu_dereference(queue->qdisc);
730 qdisc_qstats_qlen_backlog(qdisc, &qlen, &backlog);
731
732 *(__be32 *)data = cpu_to_be32(backlog);
733 }
9ee11f0f
JI		 734 data += sizeof(__be32);
735 }
736
737 /* checksum complement */
738 if (trace->type.bit7) {
739 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
740 data += sizeof(__be32);
741 }
742
743 /* hop_lim and node_id (wide) */
744 if (trace->type.bit8) {
745 byte = ipv6_hdr(skb)->hop_limit;
52d03786 746 if (is_input)
9ee11f0f
JI		 747 byte--;
748
3edede08 749 raw64 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id_wide;
9ee11f0f
JI		 750
751 *(__be64 *)data = cpu_to_be64(((u64)byte << 56) | raw64);
752 data += sizeof(__be64);
753 }
754
755 /* ingress_if_id and egress_if_id (wide) */
756 if (trace->type.bit9) {
757 if (!skb->dev)
758 raw32 = IOAM6_U32_UNAVAILABLE;
759 else
760 raw32 = __in6_dev_get(skb->dev)->cnf.ioam6_id_wide;
761
762 *(__be32 *)data = cpu_to_be32(raw32);
763 data += sizeof(__be32);
764
765 if (skb_dst(skb)->dev->flags & IFF_LOOPBACK)
766 raw32 = IOAM6_U32_UNAVAILABLE;
767 else
768 raw32 = __in6_dev_get(skb_dst(skb)->dev)->cnf.ioam6_id_wide;
769
770 *(__be32 *)data = cpu_to_be32(raw32);
771 data += sizeof(__be32);
772 }
773
774 /* namespace data (wide) */
775 if (trace->type.bit10) {
776 *(__be64 *)data = ns->data_wide;
777 data += sizeof(__be64);
778 }
779
780 /* buffer occupancy */
781 if (trace->type.bit11) {
782 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
783 data += sizeof(__be32);
784 }
785
2bbc977c
JI		 786 /* bit12 undefined: filled with empty value */
787 if (trace->type.bit12) {
788 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
789 data += sizeof(__be32);
790 }
791
792 /* bit13 undefined: filled with empty value */
793 if (trace->type.bit13) {
794 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
795 data += sizeof(__be32);
796 }
797
798 /* bit14 undefined: filled with empty value */
799 if (trace->type.bit14) {
800 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
801 data += sizeof(__be32);
802 }
803
804 /* bit15 undefined: filled with empty value */
805 if (trace->type.bit15) {
806 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
807 data += sizeof(__be32);
808 }
809
810 /* bit16 undefined: filled with empty value */
811 if (trace->type.bit16) {
812 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
813 data += sizeof(__be32);
814 }
815
816 /* bit17 undefined: filled with empty value */
817 if (trace->type.bit17) {
818 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
819 data += sizeof(__be32);
820 }
821
822 /* bit18 undefined: filled with empty value */
823 if (trace->type.bit18) {
824 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
825 data += sizeof(__be32);
826 }
827
828 /* bit19 undefined: filled with empty value */
829 if (trace->type.bit19) {
830 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
831 data += sizeof(__be32);
832 }
833
834 /* bit20 undefined: filled with empty value */
835 if (trace->type.bit20) {
836 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
837 data += sizeof(__be32);
838 }
839
840 /* bit21 undefined: filled with empty value */
841 if (trace->type.bit21) {
842 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
843 data += sizeof(__be32);
844 }
845
9ee11f0f
JI		 846 /* opaque state snapshot */
847 if (trace->type.bit22) {
848 if (!sc) {
849 *(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE >> 8);
850 } else {
851 *(__be32 *)data = sc->hdr;
852 data += sizeof(__be32);
853
854 memcpy(data, sc->data, sc->len);
855 }
856 }
857}
858
859/* called with rcu_read_lock() */
860void ioam6_fill_trace_data(struct sk_buff *skb,
861 struct ioam6_namespace *ns,
52d03786
JI		 862 struct ioam6_trace_hdr *trace,
863 bool is_input)
9ee11f0f
JI		 864{
865 struct ioam6_schema *sc;
866 u8 sclen = 0;
867
2bbc977c 868 /* Skip if Overflow flag is set
9ee11f0f 869 */
2bbc977c 870 if (trace->overflow)
9ee11f0f 871 return;
9ee11f0f
JI		 872
873 /* NodeLen does not include Opaque State Snapshot length. We need to
874 * take it into account if the corresponding bit is set (bit 22) and
875 * if the current IOAM namespace has an active schema attached to it
876 */
877 sc = rcu_dereference(ns->schema);
878 if (trace->type.bit22) {
879 sclen = sizeof_field(struct ioam6_schema, hdr) / 4;
880
881 if (sc)
882 sclen += sc->len / 4;
883 }
884
885 /* If there is no space remaining, we set the Overflow flag and we
886 * skip without filling the trace
887 */
888 if (!trace->remlen || trace->remlen < trace->nodelen + sclen) {
889 trace->overflow = 1;
890 return;
891 }
892
52d03786 893 __ioam6_fill_trace_data(skb, ns, trace, sc, sclen, is_input);
9ee11f0f
JI		 894 trace->remlen -= trace->nodelen + sclen;
895}
896
897static int __net_init ioam6_net_init(struct net *net)
898{
899 struct ioam6_pernet_data *nsdata;
900 int err = -ENOMEM;
901
902 nsdata = kzalloc(sizeof(*nsdata), GFP_KERNEL);
903 if (!nsdata)
904 goto out;
905
906 mutex_init(&nsdata->lock);
907 net->ipv6.ioam6_data = nsdata;
908
909 err = rhashtable_init(&nsdata->namespaces, &rht_ns_params);
910 if (err)
911 goto free_nsdata;
912
913 err = rhashtable_init(&nsdata->schemas, &rht_sc_params);
914 if (err)
915 goto free_rht_ns;
916
917out:
918 return err;
919free_rht_ns:
920 rhashtable_destroy(&nsdata->namespaces);
921free_nsdata:
922 kfree(nsdata);
923 net->ipv6.ioam6_data = NULL;
924 goto out;
925}
926
927static void __net_exit ioam6_net_exit(struct net *net)
928{
929 struct ioam6_pernet_data *nsdata = ioam6_pernet(net);
930
931 rhashtable_free_and_destroy(&nsdata->namespaces, ioam6_free_ns, NULL);
932 rhashtable_free_and_destroy(&nsdata->schemas, ioam6_free_sc, NULL);
933
934 kfree(nsdata);
935}
936
937static struct pernet_operations ioam6_net_ops = {
938 .init = ioam6_net_init,
939 .exit = ioam6_net_exit,
940};
941
942int __init ioam6_init(void)
943{
944 int err = register_pernet_subsys(&ioam6_net_ops);
8c6f6fa6
JI		 945 if (err)
946 goto out;
9ee11f0f 947
8c6f6fa6 948 err = genl_register_family(&ioam6_genl_family);
9ee11f0f 949 if (err)
8c6f6fa6 950 goto out_unregister_pernet_subsys;
9ee11f0f 951
3edede08
JI		 952#ifdef CONFIG_IPV6_IOAM6_LWTUNNEL
953 err = ioam6_iptunnel_init();
954 if (err)
955 goto out_unregister_genl;
956#endif
957
9ee11f0f 958 pr_info("In-situ OAM (IOAM) with IPv6\n");
8c6f6fa6
JI		 959
960out:
961 return err;
3edede08
JI		 962#ifdef CONFIG_IPV6_IOAM6_LWTUNNEL
963out_unregister_genl:
964 genl_unregister_family(&ioam6_genl_family);
965#endif
8c6f6fa6
JI		 966out_unregister_pernet_subsys:
967 unregister_pernet_subsys(&ioam6_net_ops);
968 goto out;
9ee11f0f
JI		 969}
970
971void ioam6_exit(void)
972{
3edede08
JI		 973#ifdef CONFIG_IPV6_IOAM6_LWTUNNEL
974 ioam6_iptunnel_exit();
975#endif
8c6f6fa6 976 genl_unregister_family(&ioam6_genl_family);
9ee11f0f
JI		 977 unregister_pernet_subsys(&ioam6_net_ops);
978}
Linux 6.x block layer and io_uring tree(s)