--- /dev/null
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
+#ifndef __ENTRYPOINTS_BPF_SKEL_H__
+#define __ENTRYPOINTS_BPF_SKEL_H__
+
+#include <bpf/skel_internal.h>
+
+struct entrypoints_bpf {
+ struct bpf_loader_ctx ctx;
+ struct {
+ struct bpf_map_desc hid_jmp_table;
+ struct bpf_map_desc progs_map;
+ } maps;
+ struct {
+ struct bpf_prog_desc hid_tail_call;
+ struct bpf_prog_desc hid_prog_release;
+ struct bpf_prog_desc hid_free_inode;
+ } progs;
+ struct {
+ int hid_tail_call_fd;
+ int hid_prog_release_fd;
+ int hid_free_inode_fd;
+ } links;
+};
+
+static inline int
+entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
+{
+ int prog_fd = skel->progs.hid_tail_call.prog_fd;
+ int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+ if (fd > 0)
+ skel->links.hid_tail_call_fd = fd;
+ return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel)
+{
+ int prog_fd = skel->progs.hid_prog_release.prog_fd;
+ int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+ if (fd > 0)
+ skel->links.hid_prog_release_fd = fd;
+ return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel)
+{
+ int prog_fd = skel->progs.hid_free_inode.prog_fd;
+ int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+ if (fd > 0)
+ skel->links.hid_free_inode_fd = fd;
+ return fd;
+}
+
+static inline int
+entrypoints_bpf__attach(struct entrypoints_bpf *skel)
+{
+ int ret = 0;
+
+ ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
+ ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel);
+ ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel);
+ return ret < 0 ? ret : 0;
+}
+
+static inline void
+entrypoints_bpf__detach(struct entrypoints_bpf *skel)
+{
+ skel_closenz(skel->links.hid_tail_call_fd);
+ skel_closenz(skel->links.hid_prog_release_fd);
+ skel_closenz(skel->links.hid_free_inode_fd);
+}
+static void
+entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
+{
+ if (!skel)
+ return;
+ entrypoints_bpf__detach(skel);
+ skel_closenz(skel->progs.hid_tail_call.prog_fd);
+ skel_closenz(skel->progs.hid_prog_release.prog_fd);
+ skel_closenz(skel->progs.hid_free_inode.prog_fd);
+ skel_closenz(skel->maps.hid_jmp_table.map_fd);
+ skel_closenz(skel->maps.progs_map.map_fd);
+ skel_free(skel);
+}
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open(void)
+{
+ struct entrypoints_bpf *skel;
+
+ skel = skel_alloc(sizeof(*skel));
+ if (!skel)
+ goto cleanup;
+ skel->ctx.sz = (void *)&skel->links - (void *)skel;
+ return skel;
+cleanup:
+ entrypoints_bpf__destroy(skel);
+ return NULL;
+}
+
+static inline int
+entrypoints_bpf__load(struct entrypoints_bpf *skel)
+{
+ struct bpf_load_and_run_opts opts = {};
+ int err;
+
+ opts.ctx = (struct bpf_loader_ctx *)skel;
+ opts.data_sz = 10624;
+ opts.data = (void *)"\
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+ opts.insns_sz = 3152;
+ opts.insns = (void *)"\
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+\x84\xff\0\0\0\0\x63\x06\x3c\0\0\0\0\0\x61\xa0\x88\xff\0\0\0\0\x63\x06\x40\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x28\0\
+\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+ err = bpf_load_and_run(&opts);
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open_and_load(void)
+{
+ struct entrypoints_bpf *skel;
+
+ skel = entrypoints_bpf__open();
+ if (!skel)
+ return NULL;
+ if (entrypoints_bpf__load(skel)) {
+ entrypoints_bpf__destroy(skel);
+ return NULL;
+ }
+ return skel;
+}
+
+__attribute__((unused)) static void
+entrypoints_bpf__assert(struct entrypoints_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+#endif /* __ENTRYPOINTS_BPF_SKEL_H__ */
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * HID-BPF support for Linux
+ *
+ * Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/circ_buf.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+#include "entrypoints/entrypoints.lskel.h"
+
+#define HID_BPF_MAX_PROGS 1024 /* keep this in sync with preloaded bpf,
+ * needs to be a power of 2 as we use it as
+ * a circular buffer
+ */
+
+#define NEXT(idx) (((idx) + 1) & (HID_BPF_MAX_PROGS - 1))
+#define PREV(idx) (((idx) - 1) & (HID_BPF_MAX_PROGS - 1))
+
+/*
+ * represents one attached program stored in the hid jump table
+ */
+struct hid_bpf_prog_entry {
+ struct bpf_prog *prog;
+ struct hid_device *hdev;
+ enum hid_bpf_prog_type type;
+ u16 idx;
+};
+
+struct hid_bpf_jmp_table {
+ struct bpf_map *map;
+ struct bpf_map *prog_keys;
+ struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
+ int tail, head;
+ struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
+ unsigned long enabled[BITS_TO_LONGS(HID_BPF_MAX_PROGS)];
+};
+
+#define FOR_ENTRIES(__i, __start, __end) \
+ for (__i = __start; CIRC_CNT(__end, __i, HID_BPF_MAX_PROGS); __i = NEXT(__i))
+
+static struct hid_bpf_jmp_table jmp_table;
+
+static DEFINE_MUTEX(hid_bpf_attach_lock); /* held when attaching/detaching programs */
+
+static void hid_bpf_release_progs(struct work_struct *work);
+
+static DECLARE_WORK(release_work, hid_bpf_release_progs);
+
+BTF_ID_LIST(hid_bpf_btf_ids)
+BTF_ID(func, hid_bpf_device_event) /* HID_BPF_PROG_TYPE_DEVICE_EVENT */
+
+static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
+{
+ switch (type) {
+ case HID_BPF_PROG_TYPE_DEVICE_EVENT:
+ return HID_BPF_MAX_PROGS_PER_DEV;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int hid_bpf_program_count(struct hid_device *hdev,
+ struct bpf_prog *prog,
+ enum hid_bpf_prog_type type)
+{
+ int i, n = 0;
+
+ if (type >= HID_BPF_PROG_TYPE_MAX)
+ return -EINVAL;
+
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (type != HID_BPF_PROG_TYPE_UNDEF && entry->type != type)
+ continue;
+
+ if (hdev && entry->hdev != hdev)
+ continue;
+
+ if (prog && entry->prog != prog)
+ continue;
+
+ n++;
+ }
+
+ return n;
+}
+
+__weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
+{
+ return 0;
+}
+ALLOW_ERROR_INJECTION(__hid_bpf_tail_call, ERRNO);
+
+int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
+ struct hid_bpf_ctx_kern *ctx_kern)
+{
+ struct hid_bpf_prog_list *prog_list;
+ int i, idx, err = 0;
+
+ rcu_read_lock();
+ prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+ if (!prog_list)
+ goto out_unlock;
+
+ for (i = 0; i < prog_list->prog_cnt; i++) {
+ idx = prog_list->prog_idx[i];
+
+ if (!test_bit(idx, jmp_table.enabled))
+ continue;
+
+ ctx_kern->ctx.index = idx;
+ err = __hid_bpf_tail_call(&ctx_kern->ctx);
+ if (err)
+ break;
+ }
+
+ out_unlock:
+ rcu_read_unlock();
+
+ return err;
+}
+
+/*
+ * assign the list of programs attached to a given hid device.
+ */
+static void __hid_bpf_set_hdev_progs(struct hid_device *hdev, struct hid_bpf_prog_list *new_list,
+ enum hid_bpf_prog_type type)
+{
+ struct hid_bpf_prog_list *old_list;
+
+ spin_lock(&hdev->bpf.progs_lock);
+ old_list = rcu_dereference_protected(hdev->bpf.progs[type],
+ lockdep_is_held(&hdev->bpf.progs_lock));
+ rcu_assign_pointer(hdev->bpf.progs[type], new_list);
+ spin_unlock(&hdev->bpf.progs_lock);
+ synchronize_rcu();
+
+ kfree(old_list);
+}
+
+/*
+ * allocate and populate the list of programs attached to a given hid device.
+ *
+ * Must be called under lock.
+ */
+static int hid_bpf_populate_hdev(struct hid_device *hdev, enum hid_bpf_prog_type type)
+{
+ struct hid_bpf_prog_list *new_list;
+ int i;
+
+ if (type >= HID_BPF_PROG_TYPE_MAX || !hdev)
+ return -EINVAL;
+
+ if (hdev->bpf.destroyed)
+ return 0;
+
+ new_list = kzalloc(sizeof(*new_list), GFP_KERNEL);
+ if (!new_list)
+ return -ENOMEM;
+
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (entry->type == type && entry->hdev == hdev &&
+ test_bit(entry->idx, jmp_table.enabled))
+ new_list->prog_idx[new_list->prog_cnt++] = entry->idx;
+ }
+
+ __hid_bpf_set_hdev_progs(hdev, new_list, type);
+
+ return 0;
+}
+
+static void __hid_bpf_do_release_prog(int map_fd, unsigned int idx)
+{
+ skel_map_delete_elem(map_fd, &idx);
+ jmp_table.progs[idx] = NULL;
+}
+
+static void hid_bpf_release_progs(struct work_struct *work)
+{
+ int i, j, n, map_fd = -1;
+
+ if (!jmp_table.map)
+ return;
+
+ /* retrieve a fd of our prog_array map in BPF */
+ map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+ if (map_fd < 0)
+ return;
+
+ mutex_lock(&hid_bpf_attach_lock); /* protects against attaching new programs */
+
+ /* detach unused progs from HID devices */
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+ enum hid_bpf_prog_type type;
+ struct hid_device *hdev;
+
+ if (test_bit(entry->idx, jmp_table.enabled))
+ continue;
+
+ /* we have an attached prog */
+ if (entry->hdev) {
+ hdev = entry->hdev;
+ type = entry->type;
+
+ hid_bpf_populate_hdev(hdev, type);
+
+ /* mark all other disabled progs from hdev of the given type as detached */
+ FOR_ENTRIES(j, i, jmp_table.head) {
+ struct hid_bpf_prog_entry *next;
+
+ next = &jmp_table.entries[j];
+
+ if (test_bit(next->idx, jmp_table.enabled))
+ continue;
+
+ if (next->hdev == hdev && next->type == type)
+ next->hdev = NULL;
+ }
+ }
+ }
+
+ /* remove all unused progs from the jump table */
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (test_bit(entry->idx, jmp_table.enabled))
+ continue;
+
+ if (entry->prog)
+ __hid_bpf_do_release_prog(map_fd, entry->idx);
+ }
+
+ /* compact the entry list */
+ n = jmp_table.tail;
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (!test_bit(entry->idx, jmp_table.enabled))
+ continue;
+
+ jmp_table.entries[n] = jmp_table.entries[i];
+ n = NEXT(n);
+ }
+
+ jmp_table.head = n;
+
+ mutex_unlock(&hid_bpf_attach_lock);
+
+ if (map_fd >= 0)
+ close_fd(map_fd);
+}
+
+static void hid_bpf_release_prog_at(int idx)
+{
+ int map_fd = -1;
+
+ /* retrieve a fd of our prog_array map in BPF */
+ map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+ if (map_fd < 0)
+ return;
+
+ __hid_bpf_do_release_prog(map_fd, idx);
+
+ close(map_fd);
+}
+
+/*
+ * Insert the given BPF program represented by its fd in the jmp table.
+ * Returns the index in the jump table or a negative error.
+ */
+static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
+{
+ int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL;
+
+ /* retrieve a fd of our prog_array map in BPF */
+ map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+ /* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */
+ progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id);
+
+ if (map_fd < 0 || progs_map_fd < 0) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ cnt = 0;
+ /* find the first available index in the jmp_table
+ * and count how many time this program has been inserted
+ */
+ for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
+ if (!jmp_table.progs[i] && index < 0) {
+ /* mark the index as used */
+ jmp_table.progs[i] = prog;
+ index = i;
+ __set_bit(i, jmp_table.enabled);
+ cnt++;
+ } else {
+ if (jmp_table.progs[i] == prog)
+ cnt++;
+ }
+ }
+ if (index < 0) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* insert the program in the jump table */
+ err = skel_map_update_elem(map_fd, &index, &prog_fd, 0);
+ if (err)
+ goto out;
+
+ /* insert the program in the prog list table */
+ err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0);
+ if (err)
+ goto out;
+
+ /* return the index */
+ err = index;
+
+ out:
+ if (err < 0)
+ __hid_bpf_do_release_prog(map_fd, index);
+ if (map_fd >= 0)
+ close_fd(map_fd);
+ if (progs_map_fd >= 0)
+ close_fd(progs_map_fd);
+ return err;
+}
+
+int hid_bpf_get_prog_attach_type(int prog_fd)
+{
+ struct bpf_prog *prog = NULL;
+ int i;
+ int prog_type = HID_BPF_PROG_TYPE_UNDEF;
+
+ prog = bpf_prog_get(prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ for (i = 0; i < HID_BPF_PROG_TYPE_MAX; i++) {
+ if (hid_bpf_btf_ids[i] == prog->aux->attach_btf_id) {
+ prog_type = i;
+ break;
+ }
+ }
+
+ bpf_prog_put(prog);
+
+ return prog_type;
+}
+
+/* called from syscall */
+noinline int
+__hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
+ int prog_fd, __u32 flags)
+{
+ struct bpf_prog *prog = NULL;
+ struct hid_bpf_prog_entry *prog_entry;
+ int cnt, err = -EINVAL, prog_idx = -1;
+
+ /* take a ref on the prog itself */
+ prog = bpf_prog_get(prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ mutex_lock(&hid_bpf_attach_lock);
+
+ /* do not attach too many programs to a given HID device */
+ cnt = hid_bpf_program_count(hdev, NULL, prog_type);
+ if (cnt < 0) {
+ err = cnt;
+ goto out_unlock;
+ }
+
+ if (cnt >= hid_bpf_max_programs(prog_type)) {
+ err = -E2BIG;
+ goto out_unlock;
+ }
+
+ prog_idx = hid_bpf_insert_prog(prog_fd, prog);
+ /* if the jmp table is full, abort */
+ if (prog_idx < 0) {
+ err = prog_idx;
+ goto out_unlock;
+ }
+
+ if (flags & HID_BPF_FLAG_INSERT_HEAD) {
+ /* take the previous prog_entry slot */
+ jmp_table.tail = PREV(jmp_table.tail);
+ prog_entry = &jmp_table.entries[jmp_table.tail];
+ } else {
+ /* take the next prog_entry slot */
+ prog_entry = &jmp_table.entries[jmp_table.head];
+ jmp_table.head = NEXT(jmp_table.head);
+ }
+
+ /* we steal the ref here */
+ prog_entry->prog = prog;
+ prog_entry->idx = prog_idx;
+ prog_entry->hdev = hdev;
+ prog_entry->type = prog_type;
+
+ /* finally store the index in the device list */
+ err = hid_bpf_populate_hdev(hdev, prog_type);
+ if (err)
+ hid_bpf_release_prog_at(prog_idx);
+
+ out_unlock:
+ mutex_unlock(&hid_bpf_attach_lock);
+
+ /* we only use prog as a key in the various tables, so we don't need to actually
+ * increment the ref count.
+ */
+ bpf_prog_put(prog);
+
+ return err;
+}
+
+void __hid_bpf_destroy_device(struct hid_device *hdev)
+{
+ int type, i;
+ struct hid_bpf_prog_list *prog_list;
+
+ rcu_read_lock();
+
+ for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) {
+ prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+ if (!prog_list)
+ continue;
+
+ for (i = 0; i < prog_list->prog_cnt; i++)
+ __clear_bit(prog_list->prog_idx[i], jmp_table.enabled);
+ }
+
+ rcu_read_unlock();
+
+ for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++)
+ __hid_bpf_set_hdev_progs(hdev, NULL, type);
+
+ /* schedule release of all detached progs */
+ schedule_work(&release_work);
+}
+
+noinline bool
+call_hid_bpf_prog_release(u64 prog_key, int table_cnt)
+{
+ /* compare with how many refs are left in the bpf program */
+ struct bpf_prog *prog = (struct bpf_prog *)prog_key;
+ int idx;
+
+ if (!prog)
+ return false;
+
+ if (atomic64_read(&prog->aux->refcnt) != table_cnt)
+ return false;
+
+ /* we don't need locking here because the entries in the progs table
+ * are stable:
+ * if there are other users (and the progs entries might change), we
+ * would return in the statement above.
+ */
+ for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) {
+ if (jmp_table.progs[idx] == prog) {
+ __clear_bit(idx, jmp_table.enabled);
+ break;
+ }
+ }
+ if (idx >= HID_BPF_MAX_PROGS) {
+ /* should never happen if we get our refcount right */
+ idx = -1;
+ }
+
+ /* schedule release of all detached progs */
+ schedule_work(&release_work);
+ return idx >= 0;
+}
+
+#define HID_BPF_PROGS_COUNT 3
+
+static struct bpf_link *links[HID_BPF_PROGS_COUNT];
+static struct entrypoints_bpf *skel;
+
+void hid_bpf_free_links_and_skel(void)
+{
+ int i;
+
+ /* the following is enough to release all programs attached to hid */
+ if (jmp_table.prog_keys)
+ bpf_map_put_with_uref(jmp_table.prog_keys);
+
+ if (jmp_table.map)
+ bpf_map_put_with_uref(jmp_table.map);
+
+ for (i = 0; i < ARRAY_SIZE(links); i++) {
+ if (!IS_ERR_OR_NULL(links[i]))
+ bpf_link_put(links[i]);
+ }
+ entrypoints_bpf__destroy(skel);
+}
+
+#define ATTACH_AND_STORE_LINK(__name) do { \
+ err = entrypoints_bpf__##__name##__attach(skel); \
+ if (err) \
+ goto out; \
+ \
+ links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd); \
+ if (IS_ERR(links[idx])) { \
+ err = PTR_ERR(links[idx]); \
+ goto out; \
+ } \
+ \
+ /* Avoid taking over stdin/stdout/stderr of init process. Zeroing out \
+ * makes skel_closenz() a no-op later in iterators_bpf__destroy(). \
+ */ \
+ close_fd(skel->links.__name##_fd); \
+ skel->links.__name##_fd = 0; \
+ idx++; \
+} while (0)
+
+int hid_bpf_preload_skel(void)
+{
+ int err, idx = 0;
+
+ skel = entrypoints_bpf__open();
+ if (!skel)
+ return -ENOMEM;
+
+ err = entrypoints_bpf__load(skel);
+ if (err)
+ goto out;
+
+ jmp_table.map = bpf_map_get_with_uref(skel->maps.hid_jmp_table.map_fd);
+ if (IS_ERR(jmp_table.map)) {
+ err = PTR_ERR(jmp_table.map);
+ goto out;
+ }
+
+ jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd);
+ if (IS_ERR(jmp_table.prog_keys)) {
+ err = PTR_ERR(jmp_table.prog_keys);
+ goto out;
+ }
+
+ ATTACH_AND_STORE_LINK(hid_tail_call);
+ ATTACH_AND_STORE_LINK(hid_prog_release);
+ ATTACH_AND_STORE_LINK(hid_free_inode);
+
+ return 0;
+out:
+ hid_bpf_free_links_and_skel();
+ return err;
+}
projects / platform / kernel / linux-starfive.git / commitdiff