1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2019 Facebook */
3 #include <linux/rculist.h>
4 #include <linux/list.h>
5 #include <linux/hash.h>
6 #include <linux/types.h>
7 #include <linux/spinlock.h>
10 #include <linux/btf_ids.h>
11 #include <linux/bpf_local_storage.h>
12 #include <net/bpf_sk_storage.h>
14 #include <uapi/linux/sock_diag.h>
15 #include <uapi/linux/btf.h>
16 #include <linux/rcupdate_trace.h>
18 DEFINE_BPF_STORAGE_CACHE(sk_cache);
20 static struct bpf_local_storage_data *
21 bpf_sk_storage_lookup(struct sock *sk, struct bpf_map *map, bool cacheit_lockit)
23 struct bpf_local_storage *sk_storage;
24 struct bpf_local_storage_map *smap;
27 rcu_dereference_check(sk->sk_bpf_storage, bpf_rcu_lock_held());
31 smap = (struct bpf_local_storage_map *)map;
32 return bpf_local_storage_lookup(sk_storage, smap, cacheit_lockit);
35 static int bpf_sk_storage_del(struct sock *sk, struct bpf_map *map)
37 struct bpf_local_storage_data *sdata;
39 sdata = bpf_sk_storage_lookup(sk, map, false);
43 bpf_selem_unlink(SELEM(sdata), true);
48 /* Called by __sk_destruct() & bpf_sk_storage_clone() */
49 void bpf_sk_storage_free(struct sock *sk)
51 struct bpf_local_storage_elem *selem;
52 struct bpf_local_storage *sk_storage;
53 bool free_sk_storage = false;
57 sk_storage = rcu_dereference(sk->sk_bpf_storage);
63 /* Netiher the bpf_prog nor the bpf-map's syscall
64 * could be modifying the sk_storage->list now.
65 * Thus, no elem can be added-to or deleted-from the
66 * sk_storage->list by the bpf_prog or by the bpf-map's syscall.
68 * It is racing with bpf_local_storage_map_free() alone
69 * when unlinking elem from the sk_storage->list and
70 * the map's bucket->list.
72 raw_spin_lock_bh(&sk_storage->lock);
73 hlist_for_each_entry_safe(selem, n, &sk_storage->list, snode) {
74 /* Always unlink from map before unlinking from
77 bpf_selem_unlink_map(selem);
78 free_sk_storage = bpf_selem_unlink_storage_nolock(
79 sk_storage, selem, true, false);
81 raw_spin_unlock_bh(&sk_storage->lock);
85 kfree_rcu(sk_storage, rcu);
88 static void bpf_sk_storage_map_free(struct bpf_map *map)
90 struct bpf_local_storage_map *smap;
92 smap = (struct bpf_local_storage_map *)map;
93 bpf_local_storage_cache_idx_free(&sk_cache, smap->cache_idx);
94 bpf_local_storage_map_free(smap, NULL);
97 static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
99 struct bpf_local_storage_map *smap;
101 smap = bpf_local_storage_map_alloc(attr);
103 return ERR_CAST(smap);
105 smap->cache_idx = bpf_local_storage_cache_idx_get(&sk_cache);
109 static int notsupp_get_next_key(struct bpf_map *map, void *key,
115 static void *bpf_fd_sk_storage_lookup_elem(struct bpf_map *map, void *key)
117 struct bpf_local_storage_data *sdata;
122 sock = sockfd_lookup(fd, &err);
124 sdata = bpf_sk_storage_lookup(sock->sk, map, true);
126 return sdata ? sdata->data : NULL;
132 static int bpf_fd_sk_storage_update_elem(struct bpf_map *map, void *key,
133 void *value, u64 map_flags)
135 struct bpf_local_storage_data *sdata;
140 sock = sockfd_lookup(fd, &err);
142 sdata = bpf_local_storage_update(
143 sock->sk, (struct bpf_local_storage_map *)map, value,
144 map_flags, GFP_ATOMIC);
146 return PTR_ERR_OR_ZERO(sdata);
152 static int bpf_fd_sk_storage_delete_elem(struct bpf_map *map, void *key)
158 sock = sockfd_lookup(fd, &err);
160 err = bpf_sk_storage_del(sock->sk, map);
168 static struct bpf_local_storage_elem *
169 bpf_sk_storage_clone_elem(struct sock *newsk,
170 struct bpf_local_storage_map *smap,
171 struct bpf_local_storage_elem *selem)
173 struct bpf_local_storage_elem *copy_selem;
175 copy_selem = bpf_selem_alloc(smap, newsk, NULL, true, GFP_ATOMIC);
179 if (map_value_has_spin_lock(&smap->map))
180 copy_map_value_locked(&smap->map, SDATA(copy_selem)->data,
181 SDATA(selem)->data, true);
183 copy_map_value(&smap->map, SDATA(copy_selem)->data,
189 int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
191 struct bpf_local_storage *new_sk_storage = NULL;
192 struct bpf_local_storage *sk_storage;
193 struct bpf_local_storage_elem *selem;
196 RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
199 sk_storage = rcu_dereference(sk->sk_bpf_storage);
201 if (!sk_storage || hlist_empty(&sk_storage->list))
204 hlist_for_each_entry_rcu(selem, &sk_storage->list, snode) {
205 struct bpf_local_storage_elem *copy_selem;
206 struct bpf_local_storage_map *smap;
209 smap = rcu_dereference(SDATA(selem)->smap);
210 if (!(smap->map.map_flags & BPF_F_CLONE))
213 /* Note that for lockless listeners adding new element
214 * here can race with cleanup in bpf_local_storage_map_free.
215 * Try to grab map refcnt to make sure that it's still
216 * alive and prevent concurrent removal.
218 map = bpf_map_inc_not_zero(&smap->map);
222 copy_selem = bpf_sk_storage_clone_elem(newsk, smap, selem);
229 if (new_sk_storage) {
230 bpf_selem_link_map(smap, copy_selem);
231 bpf_selem_link_storage_nolock(new_sk_storage, copy_selem);
233 ret = bpf_local_storage_alloc(newsk, smap, copy_selem, GFP_ATOMIC);
236 atomic_sub(smap->elem_size,
237 &newsk->sk_omem_alloc);
243 rcu_dereference(copy_selem->local_storage);
251 /* In case of an error, don't free anything explicitly here, the
252 * caller is responsible to call bpf_sk_storage_free.
258 /* *gfp_flags* is a hidden argument provided by the verifier */
259 BPF_CALL_5(bpf_sk_storage_get, struct bpf_map *, map, struct sock *, sk,
260 void *, value, u64, flags, gfp_t, gfp_flags)
262 struct bpf_local_storage_data *sdata;
264 WARN_ON_ONCE(!bpf_rcu_lock_held());
265 if (!sk || !sk_fullsock(sk) || flags > BPF_SK_STORAGE_GET_F_CREATE)
266 return (unsigned long)NULL;
268 sdata = bpf_sk_storage_lookup(sk, map, true);
270 return (unsigned long)sdata->data;
272 if (flags == BPF_SK_STORAGE_GET_F_CREATE &&
273 /* Cannot add new elem to a going away sk.
274 * Otherwise, the new elem may become a leak
275 * (and also other memory issues during map
278 refcount_inc_not_zero(&sk->sk_refcnt)) {
279 sdata = bpf_local_storage_update(
280 sk, (struct bpf_local_storage_map *)map, value,
281 BPF_NOEXIST, gfp_flags);
282 /* sk must be a fullsock (guaranteed by verifier),
283 * so sock_gen_put() is unnecessary.
286 return IS_ERR(sdata) ?
287 (unsigned long)NULL : (unsigned long)sdata->data;
290 return (unsigned long)NULL;
293 BPF_CALL_2(bpf_sk_storage_delete, struct bpf_map *, map, struct sock *, sk)
295 WARN_ON_ONCE(!bpf_rcu_lock_held());
296 if (!sk || !sk_fullsock(sk))
299 if (refcount_inc_not_zero(&sk->sk_refcnt)) {
302 err = bpf_sk_storage_del(sk, map);
310 static int bpf_sk_storage_charge(struct bpf_local_storage_map *smap,
311 void *owner, u32 size)
313 struct sock *sk = (struct sock *)owner;
315 /* same check as in sock_kmalloc() */
316 if (size <= sysctl_optmem_max &&
317 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
318 atomic_add(size, &sk->sk_omem_alloc);
325 static void bpf_sk_storage_uncharge(struct bpf_local_storage_map *smap,
326 void *owner, u32 size)
328 struct sock *sk = owner;
330 atomic_sub(size, &sk->sk_omem_alloc);
333 static struct bpf_local_storage __rcu **
334 bpf_sk_storage_ptr(void *owner)
336 struct sock *sk = owner;
338 return &sk->sk_bpf_storage;
341 BTF_ID_LIST_SINGLE(sk_storage_map_btf_ids, struct, bpf_local_storage_map)
342 const struct bpf_map_ops sk_storage_map_ops = {
343 .map_meta_equal = bpf_map_meta_equal,
344 .map_alloc_check = bpf_local_storage_map_alloc_check,
345 .map_alloc = bpf_sk_storage_map_alloc,
346 .map_free = bpf_sk_storage_map_free,
347 .map_get_next_key = notsupp_get_next_key,
348 .map_lookup_elem = bpf_fd_sk_storage_lookup_elem,
349 .map_update_elem = bpf_fd_sk_storage_update_elem,
350 .map_delete_elem = bpf_fd_sk_storage_delete_elem,
351 .map_check_btf = bpf_local_storage_map_check_btf,
352 .map_btf_id = &sk_storage_map_btf_ids[0],
353 .map_local_storage_charge = bpf_sk_storage_charge,
354 .map_local_storage_uncharge = bpf_sk_storage_uncharge,
355 .map_owner_storage_ptr = bpf_sk_storage_ptr,
358 const struct bpf_func_proto bpf_sk_storage_get_proto = {
359 .func = bpf_sk_storage_get,
361 .ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
362 .arg1_type = ARG_CONST_MAP_PTR,
363 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
364 .arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
365 .arg4_type = ARG_ANYTHING,
368 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto = {
369 .func = bpf_sk_storage_get,
371 .ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
372 .arg1_type = ARG_CONST_MAP_PTR,
373 .arg2_type = ARG_PTR_TO_CTX, /* context is 'struct sock' */
374 .arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
375 .arg4_type = ARG_ANYTHING,
378 const struct bpf_func_proto bpf_sk_storage_delete_proto = {
379 .func = bpf_sk_storage_delete,
381 .ret_type = RET_INTEGER,
382 .arg1_type = ARG_CONST_MAP_PTR,
383 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
386 static bool bpf_sk_storage_tracing_allowed(const struct bpf_prog *prog)
388 const struct btf *btf_vmlinux;
389 const struct btf_type *t;
393 if (prog->aux->dst_prog)
396 /* Ensure the tracing program is not tracing
397 * any bpf_sk_storage*() function and also
398 * use the bpf_sk_storage_(get|delete) helper.
400 switch (prog->expected_attach_type) {
402 case BPF_TRACE_RAW_TP:
403 /* bpf_sk_storage has no trace point */
405 case BPF_TRACE_FENTRY:
406 case BPF_TRACE_FEXIT:
407 btf_vmlinux = bpf_get_btf_vmlinux();
408 if (IS_ERR_OR_NULL(btf_vmlinux))
410 btf_id = prog->aux->attach_btf_id;
411 t = btf_type_by_id(btf_vmlinux, btf_id);
412 tname = btf_name_by_offset(btf_vmlinux, t->name_off);
413 return !!strncmp(tname, "bpf_sk_storage",
414 strlen("bpf_sk_storage"));
422 /* *gfp_flags* is a hidden argument provided by the verifier */
423 BPF_CALL_5(bpf_sk_storage_get_tracing, struct bpf_map *, map, struct sock *, sk,
424 void *, value, u64, flags, gfp_t, gfp_flags)
426 WARN_ON_ONCE(!bpf_rcu_lock_held());
427 if (in_hardirq() || in_nmi())
428 return (unsigned long)NULL;
430 return (unsigned long)____bpf_sk_storage_get(map, sk, value, flags,
434 BPF_CALL_2(bpf_sk_storage_delete_tracing, struct bpf_map *, map,
437 WARN_ON_ONCE(!bpf_rcu_lock_held());
438 if (in_hardirq() || in_nmi())
441 return ____bpf_sk_storage_delete(map, sk);
444 const struct bpf_func_proto bpf_sk_storage_get_tracing_proto = {
445 .func = bpf_sk_storage_get_tracing,
447 .ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
448 .arg1_type = ARG_CONST_MAP_PTR,
449 .arg2_type = ARG_PTR_TO_BTF_ID,
450 .arg2_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON],
451 .arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
452 .arg4_type = ARG_ANYTHING,
453 .allowed = bpf_sk_storage_tracing_allowed,
456 const struct bpf_func_proto bpf_sk_storage_delete_tracing_proto = {
457 .func = bpf_sk_storage_delete_tracing,
459 .ret_type = RET_INTEGER,
460 .arg1_type = ARG_CONST_MAP_PTR,
461 .arg2_type = ARG_PTR_TO_BTF_ID,
462 .arg2_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON],
463 .allowed = bpf_sk_storage_tracing_allowed,
466 struct bpf_sk_storage_diag {
468 struct bpf_map *maps[];
471 /* The reply will be like:
472 * INET_DIAG_BPF_SK_STORAGES (nla_nest)
473 * SK_DIAG_BPF_STORAGE (nla_nest)
474 * SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
475 * SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
476 * SK_DIAG_BPF_STORAGE (nla_nest)
477 * SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
478 * SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
481 static int nla_value_size(u32 value_size)
483 /* SK_DIAG_BPF_STORAGE (nla_nest)
484 * SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
485 * SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
487 return nla_total_size(0) + nla_total_size(sizeof(u32)) +
488 nla_total_size_64bit(value_size);
491 void bpf_sk_storage_diag_free(struct bpf_sk_storage_diag *diag)
498 for (i = 0; i < diag->nr_maps; i++)
499 bpf_map_put(diag->maps[i]);
503 EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_free);
505 static bool diag_check_dup(const struct bpf_sk_storage_diag *diag,
506 const struct bpf_map *map)
510 for (i = 0; i < diag->nr_maps; i++) {
511 if (diag->maps[i] == map)
518 struct bpf_sk_storage_diag *
519 bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs)
521 struct bpf_sk_storage_diag *diag;
526 /* bpf_local_storage_map is currently limited to CAP_SYS_ADMIN as
527 * the map_alloc_check() side also does.
530 return ERR_PTR(-EPERM);
532 nla_for_each_nested(nla, nla_stgs, rem) {
533 if (nla_type(nla) == SK_DIAG_BPF_STORAGE_REQ_MAP_FD)
537 diag = kzalloc(struct_size(diag, maps, nr_maps), GFP_KERNEL);
539 return ERR_PTR(-ENOMEM);
541 nla_for_each_nested(nla, nla_stgs, rem) {
545 if (nla_type(nla) != SK_DIAG_BPF_STORAGE_REQ_MAP_FD)
548 map_fd = nla_get_u32(nla);
549 map = bpf_map_get(map_fd);
554 if (map->map_type != BPF_MAP_TYPE_SK_STORAGE) {
559 if (diag_check_dup(diag, map)) {
564 diag->maps[diag->nr_maps++] = map;
570 bpf_sk_storage_diag_free(diag);
573 EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_alloc);
575 static int diag_get(struct bpf_local_storage_data *sdata, struct sk_buff *skb)
577 struct nlattr *nla_stg, *nla_value;
578 struct bpf_local_storage_map *smap;
580 /* It cannot exceed max nlattr's payload */
581 BUILD_BUG_ON(U16_MAX - NLA_HDRLEN < BPF_LOCAL_STORAGE_MAX_VALUE_SIZE);
583 nla_stg = nla_nest_start(skb, SK_DIAG_BPF_STORAGE);
587 smap = rcu_dereference(sdata->smap);
588 if (nla_put_u32(skb, SK_DIAG_BPF_STORAGE_MAP_ID, smap->map.id))
591 nla_value = nla_reserve_64bit(skb, SK_DIAG_BPF_STORAGE_MAP_VALUE,
592 smap->map.value_size,
593 SK_DIAG_BPF_STORAGE_PAD);
597 if (map_value_has_spin_lock(&smap->map))
598 copy_map_value_locked(&smap->map, nla_data(nla_value),
601 copy_map_value(&smap->map, nla_data(nla_value), sdata->data);
603 nla_nest_end(skb, nla_stg);
607 nla_nest_cancel(skb, nla_stg);
611 static int bpf_sk_storage_diag_put_all(struct sock *sk, struct sk_buff *skb,
613 unsigned int *res_diag_size)
615 /* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */
616 unsigned int diag_size = nla_total_size(0);
617 struct bpf_local_storage *sk_storage;
618 struct bpf_local_storage_elem *selem;
619 struct bpf_local_storage_map *smap;
620 struct nlattr *nla_stgs;
621 unsigned int saved_len;
626 sk_storage = rcu_dereference(sk->sk_bpf_storage);
627 if (!sk_storage || hlist_empty(&sk_storage->list)) {
632 nla_stgs = nla_nest_start(skb, stg_array_type);
634 /* Continue to learn diag_size */
637 saved_len = skb->len;
638 hlist_for_each_entry_rcu(selem, &sk_storage->list, snode) {
639 smap = rcu_dereference(SDATA(selem)->smap);
640 diag_size += nla_value_size(smap->map.value_size);
642 if (nla_stgs && diag_get(SDATA(selem), skb))
643 /* Continue to learn diag_size */
650 if (saved_len == skb->len)
651 nla_nest_cancel(skb, nla_stgs);
653 nla_nest_end(skb, nla_stgs);
656 if (diag_size == nla_total_size(0)) {
661 *res_diag_size = diag_size;
665 int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
666 struct sock *sk, struct sk_buff *skb,
668 unsigned int *res_diag_size)
670 /* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */
671 unsigned int diag_size = nla_total_size(0);
672 struct bpf_local_storage *sk_storage;
673 struct bpf_local_storage_data *sdata;
674 struct nlattr *nla_stgs;
675 unsigned int saved_len;
681 /* No map has been specified. Dump all. */
683 return bpf_sk_storage_diag_put_all(sk, skb, stg_array_type,
687 sk_storage = rcu_dereference(sk->sk_bpf_storage);
688 if (!sk_storage || hlist_empty(&sk_storage->list)) {
693 nla_stgs = nla_nest_start(skb, stg_array_type);
695 /* Continue to learn diag_size */
698 saved_len = skb->len;
699 for (i = 0; i < diag->nr_maps; i++) {
700 sdata = bpf_local_storage_lookup(sk_storage,
701 (struct bpf_local_storage_map *)diag->maps[i],
707 diag_size += nla_value_size(diag->maps[i]->value_size);
709 if (nla_stgs && diag_get(sdata, skb))
710 /* Continue to learn diag_size */
716 if (saved_len == skb->len)
717 nla_nest_cancel(skb, nla_stgs);
719 nla_nest_end(skb, nla_stgs);
722 if (diag_size == nla_total_size(0)) {
727 *res_diag_size = diag_size;
730 EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_put);
732 struct bpf_iter_seq_sk_storage_map_info {
734 unsigned int bucket_id;
738 static struct bpf_local_storage_elem *
739 bpf_sk_storage_map_seq_find_next(struct bpf_iter_seq_sk_storage_map_info *info,
740 struct bpf_local_storage_elem *prev_selem)
741 __acquires(RCU) __releases(RCU)
743 struct bpf_local_storage *sk_storage;
744 struct bpf_local_storage_elem *selem;
745 u32 skip_elems = info->skip_elems;
746 struct bpf_local_storage_map *smap;
747 u32 bucket_id = info->bucket_id;
748 u32 i, count, n_buckets;
749 struct bpf_local_storage_map_bucket *b;
751 smap = (struct bpf_local_storage_map *)info->map;
752 n_buckets = 1U << smap->bucket_log;
753 if (bucket_id >= n_buckets)
756 /* try to find next selem in the same bucket */
760 selem = hlist_entry_safe(rcu_dereference(hlist_next_rcu(&selem->map_node)),
761 struct bpf_local_storage_elem, map_node);
763 /* not found, unlock and go to the next bucket */
764 b = &smap->buckets[bucket_id++];
769 sk_storage = rcu_dereference(selem->local_storage);
771 info->skip_elems = skip_elems + count;
777 for (i = bucket_id; i < (1U << smap->bucket_log); i++) {
778 b = &smap->buckets[i];
781 hlist_for_each_entry_rcu(selem, &b->list, map_node) {
782 sk_storage = rcu_dereference(selem->local_storage);
783 if (sk_storage && count >= skip_elems) {
785 info->skip_elems = count;
795 info->skip_elems = 0;
799 static void *bpf_sk_storage_map_seq_start(struct seq_file *seq, loff_t *pos)
801 struct bpf_local_storage_elem *selem;
803 selem = bpf_sk_storage_map_seq_find_next(seq->private, NULL);
812 static void *bpf_sk_storage_map_seq_next(struct seq_file *seq, void *v,
815 struct bpf_iter_seq_sk_storage_map_info *info = seq->private;
819 return bpf_sk_storage_map_seq_find_next(seq->private, v);
822 struct bpf_iter__bpf_sk_storage_map {
823 __bpf_md_ptr(struct bpf_iter_meta *, meta);
824 __bpf_md_ptr(struct bpf_map *, map);
825 __bpf_md_ptr(struct sock *, sk);
826 __bpf_md_ptr(void *, value);
829 DEFINE_BPF_ITER_FUNC(bpf_sk_storage_map, struct bpf_iter_meta *meta,
830 struct bpf_map *map, struct sock *sk,
833 static int __bpf_sk_storage_map_seq_show(struct seq_file *seq,
834 struct bpf_local_storage_elem *selem)
836 struct bpf_iter_seq_sk_storage_map_info *info = seq->private;
837 struct bpf_iter__bpf_sk_storage_map ctx = {};
838 struct bpf_local_storage *sk_storage;
839 struct bpf_iter_meta meta;
840 struct bpf_prog *prog;
844 prog = bpf_iter_get_info(&meta, selem == NULL);
849 sk_storage = rcu_dereference(selem->local_storage);
850 ctx.sk = sk_storage->owner;
851 ctx.value = SDATA(selem)->data;
853 ret = bpf_iter_run_prog(prog, &ctx);
859 static int bpf_sk_storage_map_seq_show(struct seq_file *seq, void *v)
861 return __bpf_sk_storage_map_seq_show(seq, v);
864 static void bpf_sk_storage_map_seq_stop(struct seq_file *seq, void *v)
868 (void)__bpf_sk_storage_map_seq_show(seq, v);
873 static int bpf_iter_init_sk_storage_map(void *priv_data,
874 struct bpf_iter_aux_info *aux)
876 struct bpf_iter_seq_sk_storage_map_info *seq_info = priv_data;
878 bpf_map_inc_with_uref(aux->map);
879 seq_info->map = aux->map;
883 static void bpf_iter_fini_sk_storage_map(void *priv_data)
885 struct bpf_iter_seq_sk_storage_map_info *seq_info = priv_data;
887 bpf_map_put_with_uref(seq_info->map);
890 static int bpf_iter_attach_map(struct bpf_prog *prog,
891 union bpf_iter_link_info *linfo,
892 struct bpf_iter_aux_info *aux)
897 if (!linfo->map.map_fd)
900 map = bpf_map_get_with_uref(linfo->map.map_fd);
904 if (map->map_type != BPF_MAP_TYPE_SK_STORAGE)
907 if (prog->aux->max_rdwr_access > map->value_size) {
916 bpf_map_put_with_uref(map);
920 static void bpf_iter_detach_map(struct bpf_iter_aux_info *aux)
922 bpf_map_put_with_uref(aux->map);
925 static const struct seq_operations bpf_sk_storage_map_seq_ops = {
926 .start = bpf_sk_storage_map_seq_start,
927 .next = bpf_sk_storage_map_seq_next,
928 .stop = bpf_sk_storage_map_seq_stop,
929 .show = bpf_sk_storage_map_seq_show,
932 static const struct bpf_iter_seq_info iter_seq_info = {
933 .seq_ops = &bpf_sk_storage_map_seq_ops,
934 .init_seq_private = bpf_iter_init_sk_storage_map,
935 .fini_seq_private = bpf_iter_fini_sk_storage_map,
936 .seq_priv_size = sizeof(struct bpf_iter_seq_sk_storage_map_info),
939 static struct bpf_iter_reg bpf_sk_storage_map_reg_info = {
940 .target = "bpf_sk_storage_map",
941 .attach_target = bpf_iter_attach_map,
942 .detach_target = bpf_iter_detach_map,
943 .show_fdinfo = bpf_iter_map_show_fdinfo,
944 .fill_link_info = bpf_iter_map_fill_link_info,
945 .ctx_arg_info_size = 2,
947 { offsetof(struct bpf_iter__bpf_sk_storage_map, sk),
948 PTR_TO_BTF_ID_OR_NULL },
949 { offsetof(struct bpf_iter__bpf_sk_storage_map, value),
950 PTR_TO_BUF | PTR_MAYBE_NULL },
952 .seq_info = &iter_seq_info,
955 static int __init bpf_sk_storage_map_iter_init(void)
957 bpf_sk_storage_map_reg_info.ctx_arg_info[0].btf_id =
958 btf_sock_ids[BTF_SOCK_TYPE_SOCK];
959 return bpf_iter_reg_target(&bpf_sk_storage_map_reg_info);
961 late_initcall(bpf_sk_storage_map_iter_init);